From t.roberts at cqu.edu.au  Sun Feb  1 00:36:43 2009
From: t.roberts at cqu.edu.au (Tim Roberts)
Date: Sun, 1 Feb 2009 15:36:43 +1000
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
Message-ID: <1AE19A80523D5F40BE0044A1447A53FF0ADB9733@UNIMAIL.staff.ad.cqu.edu.au>

Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not.  At the moment, because of accuracy concerns, I'm doing something like
 
                    for root in powersp:
                            nroot = round(bignum**(1.0/root))
                            if bignum==long(nroot)**root:
                                                             .........
which is probably very inefficient, but I can't see anything better.....
 
Tim
 
 


From steve at savechicago.org  Sun Feb  1 00:40:52 2009
From: steve at savechicago.org (steve at savechicago.org)
Date: Sat, 31 Jan 2009 21:40:52 -0800 (PST)
Subject: Please help to play 5 jpegs as a slideshow in JES(Jython) --- 
	BEGINNER.
Message-ID: <28dec764-64e4-4a47-87d5-ba3b52e3b051@r36g2000prf.googlegroups.com>

Hello, I am a brand brand new programming student in Jython and I have
been working on a simple homework assignment in JES for the last 12
hours and am completely lost.

Basically, we have to make a jpeg slideshow with 5 different pictures
with audio background that lasts 60 seconds. I have absolutely no idea
where to begin and am more lost than I was 12 hours ago.



def pickAndShow():

myfile = pickAFile()
mypicture = makePicture(myfile)
show(mypicture)

I know this is how to call up a picture from your hard drive. That?s
about all I know. I have no idea how to call up 5 of them, one at a
time, and with audio in the background. And how to make this happen
with a command. Can someone help me?


From dchandran1 at tinkercell.com  Sun Feb  1 00:47:27 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Sat, 31 Jan 2009 21:47:27 -0800
Subject: Embedding numpy works once, but not twice??
Message-ID: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>

I have a program in which I have successfully embedded Python. Now, I want
to include NumPy as well (and other modules). I am able to import numpy
once. Then I close the python console in my program and then re-open it.
When I try to import numpy for a second time, the program crashes. Below is
a simple version of the problem.

The main() import numpy twice. The first import works fine -- prints "no
errors.". But the second load crashes the program. What is going on here?

By the way, this is all in Windows (XP and Vista have same problem) using
python25.dll (since numpy does not work for python26.dll). I am using MinGW
compiler.

#include <stdlib.h>
#include <stdio.h>
#include <Python.h>

int load(char * code)
{
PyObject *errobj, *errdata, *errtraceback, *pystring;
int retval;

       Py_Initialize();

PyObject *main = PyImport_AddModule("__main__");
PyObject* main_dict = PyModule_GetDict( main );

PyObject * rstring = PyRun_String( code, Py_file_input, main_dict, main_dict
); //the second main_dict was my_program_dict originally
 PyErr_Fetch (&errobj, &errdata, &errtraceback);
 if (errdata != NULL)
{
PyObject *s = PyObject_Str(errdata);
char * c = PyString_AS_STRING(s);
printf("%s\n",c);                   //print any errors
Py_DECREF(s);
}
else
{
printf("no errors.\n");
 }
 Py_XDECREF(errobj);
Py_XDECREF(errdata);
Py_XDECREF(errtraceback);

    Py_Finalize();
    return 0;
}

int main()
{
load("import numpy\n");
load("import numpy\n");
}

//output is:
// no errors
// <CRASH>
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From http  Sun Feb  1 00:53:23 2009
From: http (Paul Rubin)
Date: 31 Jan 2009 21:53:23 -0800
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <7x4ozen1nw.fsf@ruckus.brouhaha.com>

"Tim Roberts" <t.roberts at cqu.edu.au> writes:
> Actually, all I'm interested in is whether the 100 digit numbers
> have an exact integral root, or not.  At the moment, because of
> accuracy concerns, I'm doing something like
>  
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

First of all, convert the bignum to a float outside of the loop.  Second, precompute
the inverses 1.0/2.0, 1.0/3.0, ....  Third, do the exponentiation and comparison only
if the float equivalent is very close.  I bet almost all the time you're spending is
in bignum to float conversion.

The article

     Daniel J. Bernstein (1998). "Detecting perfect powers in essentially
     linear time". Mathematics of Computation 67 (223): 1253-1283
     (http://cr.yp.to/papers/powers-ams.pdf)

may be of interest.


From sjmachin at lexicon.net  Sun Feb  1 01:14:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 31 Jan 2009 22:14:38 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
Message-ID: <6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>

On Feb 1, 3:39?pm, Shawn Milochik <Sh... at Milochik.com> wrote:

> Not to discourage the use of Python, but it seems that fgrep with the
> -f flag already does exactly what you want. If you're on Windows, you
> can get the Windows version of fgrep here: http://unxutils.sourceforge.net/

That URL is antique and a dead end. When you find the actual
sourceforge project page (http://sourceforge.net/projects/unxutils/)
and browse the forums and the CVS repository, you'll see tumbleweed
blowing down Main Street and not much else (besides a few whinges
about that dead end URL, and many unanswered issues).

Alternative: http://gnuwin32.sourceforge.net/


From http  Sun Feb  1 01:17:07 2009
From: http (Paul Rubin)
Date: 31 Jan 2009 22:17:07 -0800
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <7xk58a7kbg.fsf@ruckus.brouhaha.com>

"Tim Roberts" <t.roberts at cqu.edu.au> writes:
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

Actually that will not be accurate enough to know if bignum is, say, a perfect square.
You will have to do the small-power tests at full precision (or use a fancy algorithm).
Larger powers can be done with floats.


From t.roberts at cqu.edu.au  Sun Feb  1 01:17:53 2009
From: t.roberts at cqu.edu.au (Tim Roberts)
Date: Sun, 1 Feb 2009 16:17:53 +1000
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org><1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au><mailman.8504.1233466604.3487.python-list@python.org>
	<7x4ozen1nw.fsf@ruckus.brouhaha.com>
Message-ID: <1AE19A80523D5F40BE0044A1447A53FF0ADB9737@UNIMAIL.staff.ad.cqu.edu.au>

Paul,
 
Yes, very good, on all counts.  Many thanks.
 
Tim
 

________________________________

From: Paul Rubin [mailto:"http://phr.cx"@NOSPAM.invalid]
Sent: Sun 01-Feb-09 3:53 PM
To: python-list at python.org
Subject: Re: nth root



"Tim Roberts" <t.roberts at cqu.edu.au> writes:
> Actually, all I'm interested in is whether the 100 digit numbers
> have an exact integral root, or not.  At the moment, because of
> accuracy concerns, I'm doing something like
> 
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

First of all, convert the bignum to a float outside of the loop.  Second, precompute
the inverses 1.0/2.0, 1.0/3.0, ....  Third, do the exponentiation and comparison only
if the float equivalent is very close.  I bet almost all the time you're spending is
in bignum to float conversion.

The article

     Daniel J. Bernstein (1998). "Detecting perfect powers in essentially
     linear time". Mathematics of Computation 67 (223): 1253-1283
     (http://cr.yp.to/papers/powers-ams.pdf)

may be of interest.
--
http://mail.python.org/mailman/listinfo/python-list




From cournape at gmail.com  Sun Feb  1 01:27:18 2009
From: cournape at gmail.com (David Cournapeau)
Date: Sun, 1 Feb 2009 15:27:18 +0900
Subject: Embedding numpy works once, but not twice??
In-Reply-To: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
Message-ID: <5b8d13220901312227i1db85215wf3d544622beeaa2e@mail.gmail.com>

On Sun, Feb 1, 2009 at 2:47 PM, Deepak Chandran
<dchandran1 at tinkercell.com> wrote:
> I have a program in which I have successfully embedded Python. Now, I want
> to include NumPy as well (and other modules). I am able to import numpy
> once. Then I close the python console in my program and then re-open it.
> When I try to import numpy for a second time, the program crashes. Below is
> a simple version of the problem.
> The main() import numpy twice. The first import works fine -- prints "no
> errors.". But the second load crashes the program. What is going on here?
>
> By the way, this is all in Windows (XP and Vista have same problem) using
> python25.dll (since numpy does not work for python26.dll). I am using MinGW
> compiler.

FYI, numpy can work with python 2.6 if you build from recent svn.
numpy 1.3.0 will have 2.6 binaries

I can't really help you for your problem, I am not familiar with
python embedding. But inside python, when doing a double import,
doesn't python check against double import (e.g. the second time, it
does almost nothing) ? Is this specific to numpy, or other python
modules do that as well ?

cheers,

David


From aleksandr.goretoy at gmail.com  Sun Feb  1 02:08:26 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Sun, 1 Feb 2009 01:08:26 -0600
Subject: PyNutButter BETA 1.0.0 - Automates CSV data Importation into any 
	website http/https and/or mysql database
Message-ID: <fa98a9e30901312308neac3fd0jfdb94e708d4ea63d@mail.gmail.com>

Introducing PynutButter BETA 1.0.0

Automates csv data importation into any website. Or your money back.
Programs like this idea of a program I have here cost $2500. Pynutbutter is
opensource. You can use the code anyway you want. As long as I get my credit
where it is due. I've worked on this project for roughly 1.5 years now. This
is an idea I tried in 2 languages. PHP and python, now.

No matter how much data in your csv file.
No matter what the field names are.
No matter how data is formatted

With PyNutButter you  can parse this data in custom functions and then send
it to its destinations.
You can map all the csv file headers to fields of a html page.
It loops for each line in the csv file and imports your data.

You must configure your configuration and create custom functions that you
can call from this configuration.

I've uploaded all the main files, except my configuration(I am working on
examples and making the main project page better)

You can find this project here:

http://code.google.com/p/pynutbutter/



I've worked long and hard on this application and the idea behind it. Any
help making this tool better would be greatly appreaciated.

Please let me know what you this of this tool. Any ideas/features are also
always welcome.

I also have a presentation I am working on for this tool. I hope to find a
nice job. This tools is very powerfuls. I was think next to try it with
scapy. That would be sweet. You can add custom flavors(data parsing/sending
libraries). My goal for this tool was to make everything as dynamic as
possible. calling of functions and dealing with parsed data in functions.
Only reason why I built is because I needed a tool like this. I know someone
else woulnd't mind having a tool like this either, so here you go. If you
can please donate or something somehow.

Upcoming Features:
use of parsed data from more than one file at a time.
pyGTK for ease of configuration creation(any help?)
gui creation of custom functions
automatic form parsing based on given urls in config

-Alex Goretoy
http://www.alexgoretoy.com
somebodywhocarez at gmail.com
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From rt8396 at gmail.com  Sun Feb  1 02:10:39 2009
From: rt8396 at gmail.com (r)
Date: Sat, 31 Jan 2009 23:10:39 -0800 (PST)
Subject: Embedding numpy works once, but not twice??
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com> 
	<mailman.8507.1233469645.3487.python-list@python.org>
Message-ID: <31b8b23d-ee9d-4da1-9961-b02c6221e089@p37g2000yqd.googlegroups.com>

> Embedding numpy works once, but not twice??

That's what she said!


From gandalf at shopzeus.com  Sun Feb  1 02:37:13 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Sun, 01 Feb 2009 08:37:13 +0100
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <004e01c98095$f90f9440$0d00a8c0@hendrik>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<004e01c98095$f90f9440$0d00a8c0@hendrik>
Message-ID: <49855129.9070901@shopzeus.com>


> 8<------------------------------
>
>   
>> .......  Setting the
>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>> though).
>>     
>
> Why not?  I have been merrily setting it, and I have not noticed anything weird.
> (yet)
>   
Please see my original post. I specifically stated that I do not want to 
use setsockopt and be able to listen on the same port from many 
processes. I knew that I could use SO_REUSEADDR, but I'm heistating to 
do so. I must guarantee that only one process listens on a given port at 
the same time.

Maybe I could use some kind of locking, but it would be too difficult:

- mutexes are great but they are platform dependent and they are not in 
the standard lib
- the listening processes do not see each other's home directory so file 
locking cannot be used for this
- these processes will probably listen on many ports at the same time, 
it is also a problem with mutexes/file locks (who wants 50 lock files to 
be created?)


 Best,

   Laszlo




From mcheung63 at hotmail.com  Sun Feb  1 02:42:42 2009
From: mcheung63 at hotmail.com (mcheung63 at hotmail.com)
Date: Sat, 31 Jan 2009 23:42:42 -0800 (PST)
Subject: what IDE is the best to write python?
Message-ID: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>

Hi all
   what IDE is the best to write python?
thanks
from Peter (mcheung63 at hotmail.com)


From bj_666 at gmx.net  Sun Feb  1 02:50:38 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 1 Feb 2009 07:50:38 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
Message-ID: <6ul2ieFg1sraU1@mid.uni-berlin.de>

On Sat, 31 Jan 2009 15:28:14 -0800, thmpsn.m.k wrote:

> On Jan 31, 2:27?pm, Christian Heimes <li... at cheimes.de> wrote:
>> Do you honestly believe that C++'s private members are really private?
>> Privateness is only enforced during parsing time. Nobody can stop you
>> from messing around with header files or memory. You can still access
>> and modify private members but it's all messy and ugly. Even C# and
>> .NET don't stop you from doing nasty things from unmananged assemblies.
> 
> I don't know how you would do it in C# (or Java for that matter).

In Java you can use reflection to get your fingers on private fields.

> In C++ you can play with pointers to "get at" some memory location
> somewhere in the object.
> [Snipped pointer fiddling explanation]
> So: Sometimes it may work, usually it will be unsafe and/or non-
> portable, and in most cases the procedure will look complicated.

Or ``#define private public`` before including the header files.  Which 
doesn't look complicated to me.

> It certainly isn't something I'd try in a real application. However, it
> WOULD be tempting to access the member if the language allows me to just
> write:
> 
> print "obj.b =", obj.b
> 
> and be done with it.

And that's perfectly okay, because the author would have prepended an 
underscore to `b` if you should not mess with it.

> Personally, in Python, I use double underscores for "private" members,
> so the above would look like:
> 
> print "obj.b =", obj._NonPOD__b
> 
> but it's still easier than the C++ example.

The name mangling is there to prevent name clashes, not to make 
attributes inaccessible.  It's useful for mixin classes for example.

>> Seriously, 'private' and 'protected' are merely tools to stop bad
>> programmers from doing bad stuff. And the serve as documentation, too.
> 
> It's not just documentation. For example, suppose you're reading a class
> definition and see the declaration of a veryInterestingMember and forget
> that you're not supposed to access it. If you try to access it, the
> compiler will give you a diagnostic message at compile time.

I can't forget that because if I'm not supposed to access it, its name 
would be `_very_interesting_member`.  I don't have to wait till compile 
time to see that, it is really obvious at the time I write the code to 
access it, or decide not to because it is not part of the API.

Ciao,
	Marc 'BlackJack' Rintsch


From rt8396 at gmail.com  Sun Feb  1 03:02:55 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 00:02:55 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <f752104b-8337-4cf3-a7ca-6deb9d5c325f@v4g2000yqa.googlegroups.com>

On Feb 1, 1:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?

That's like asking boxers or briefs, everybody thinks their choice is
the best. I like freedom if that gives you a hint. :)


From bj_666 at gmx.net  Sun Feb  1 03:04:42 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 1 Feb 2009 08:04:42 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<mailman.8294.1233249573.3487.python-list@python.org>
	<cdb67709-47fa-401f-b85c-4c0f19f4a8f6@p2g2000prf.googlegroups.com>
	<mailman.8348.1233296162.3487.python-list@python.org>
	<325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
Message-ID: <6ul3cpFg1sraU2@mid.uni-berlin.de>

On Sat, 31 Jan 2009 09:08:25 -0800, thmpsn.m.k wrote:

> On Jan 30, 12:15?am, Chris Rebert <c... at rebertia.com> wrote:
>> - Python supports encapsulation. Prefixing an attribute/method with an
>> underscore indicates that other programmers should treat it as
>> 'private'. However, unlike B&D languages, Python itself does nothing to
>> enforce this privacy, leaving it instead to the good judgement of the
>> programmer, under the philosophy that "We're all consenting adults
>> here".
> 
> How do you know? (I know I'm not.)

Then stay with B&D languages.  :-)

> Seriously, though, the lack of private members does allow for ugly hacks
> in user code, and you know there are always ugly hackers.

So what?  The hacks in Java to access private fields are even uglier IMHO.

>> This allows people to meddle with internals, at their own risk, if it
>> ends up being absolutely necessary.
> 
> If it ends up being necessary, the class's design is flawed.

Maybe that's the reason why it is really necessary.

> (Though in this case, the flaw is easily solved by simply providing a
> getter.)

Simply providing a getter for a private attribute?  I thought that's not 
easily possible in C++ or Java!?  ;-)

>> The enforcement point is
>> largely academic anyway, as most languages' reflection APIs let you
>> poke at ostensibly "private" things.
> 
> If you're talking about getters, then note that this doesn't let you
> modify the member (unless there's a corresponding setter).

It's not about getters but about accessing private fields without any 
getters or setters through the reflection API.  See the article 
`Subverting Java Access Protection for Unit Testing`_ for examples.

.. _Subverting Java Access Protection for Unit Testing:
    http://www.onjava.com/pub/a/onjava/2003/11/12/reflection.html

Ciao,
	Marc 'BlackJack' Rintsch


From apt.shansen at gmail.com  Sun Feb  1 03:14:27 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 00:14:27 -0800 (PST)
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>

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From steve at pearwood.info  Sun Feb  1 03:15:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 19:15:58 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
Message-ID: <0195504e$0$20642$c3e8da3@news.astraweb.com>

Robin Becker wrote:

> Whilst considering a port of old code to python 3 I see that in several
> places we are using type comparisons to control processing of user
> instances (as opposed to instances of built in types eg float, int, str)
> 
> I find that the obvious alternatives are not as fast as the current
> code; func0 below. On my machine isinstance seems slower than type for
> some reason. My 2.6 timings are

First question is, why do you care that it's slower? The difference between
the fastest and slowest functions is 1.16-0.33 = 0.83 microsecond. If you
call the slowest function one million times, your code will run less than a
second longer.

Does that really matter, or are you engaged in premature optimization? In
your test functions, the branches all execute "pass". Your real code
probably calls other functions, makes calculations, etc, which will all
take time. Probably milliseconds rather than microseconds. I suspect you're
concerned about a difference of 0.1 of a percent, of one small part of your
entire application. Unless you have profiled your code and this really is a
bottleneck, I recommend you worry more about making your code readable and
maintainable than worrying about micro-optimisations.

Even more important that being readable is being *correct*, and I believe
that your code has some unexpected failure modes (bugs). See below:



> so func 3 seems to be the fastest option for the case when the first
> test matches, but is poor when it doesn't. Can anyone suggest a better
> way to determine if an object is a user instance?
> 
> ##############################
> from types import InstanceType

I believe this will go away in Python 3, as all classes will be New Style
classes.


> class X:
>      __X__=True

This is an Old Style class in Python 2.x, and a New Style class in Python 3.

Using hasattr('__X__') is a curious way of detecting what you want. I
suppose it could be argued that it is a variety of duck-typing: "if it has
a duck's bill, it must be a duck". (Unless it is a platypus, of course.)
However, attribute names with leading and trailing double-underscores are
reserved for use as "special methods". You should rename it to something
more appropriate: _MAGIC_LABEL, say.

 
> class V(X):
>      pass
> 
> def func0(ob):
>      t=type(ob)
>      if t is InstanceType:
>          pass

This test is too broad. It will succeed for *any* old-style class, not just
X and V instances. That's probably not what you want.

It will also fail if ob is an instance of a New Style class. Remember that
in Python 3, all classes become new-style.


>      elif t in (float, int):
>          pass

This test will fail if ob is a subclass of float or int. That's almost
certainly the wrong behavior. A better way of writing that is:

    elif issubclass(t, (float, int)):
        pass


>      else:
>          pass
> 
> def func1(ob):
>      if isinstance(ob,X):
>          pass

If you have to do type checking, that's the recommended way of doing so.



>      elif type(ob) in (float, int):
>          pass

The usual way to write that is:

    if isinstance(ob, (float, int)):
        pass



Hope this helps,


-- 
Steven



From steve at pearwood.info  Sun Feb  1 03:23:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 19:23:58 +1100
Subject: accessing elements of a tuple
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
Message-ID: <0195522e$0$31512$c3e8da3@news.astraweb.com>

D'Arcy J.M. Cain wrote:

> First of all, list is a reserved word. ?Don't use it as a variable name.

Unless you mean to. Shadowing built-ins is only a bad thing when you do it
by accident.


-- 
Steven



From http  Sun Feb  1 03:25:30 2009
From: http (Paul Rubin)
Date: 01 Feb 2009 00:25:30 -0800
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
Message-ID: <7xzlh6bm2t.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at pearwood.info> writes:
> First question is, why do you care that it's slower? The difference between
> the fastest and slowest functions is 1.16-0.33 = 0.83 microsecond. 

That's a 71% speedup, pretty good if you ask me.

> If you call the slowest function one million times, your code will
> run less than a second longer.

What if you call it a billion times, or a trillion times, or a
quadrillion times, you see where this is going?  If you're testing
100-digit numbers, there are an awful lot of them before you run out.


From casevh at gmail.com  Sun Feb  1 03:27:09 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 00:27:09 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>

On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
> Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> ? ? ? ? ? ? ? ? ? ? for root in powersp:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> which is probably very inefficient, but I can't see anything better.....
>
> Tim

Take a look at gmpy and the is_power function. I think it will do
exactly what you want.

http://code.google.com/p/gmpy/

casevh


From Shawn at Milochik.com  Sun Feb  1 03:34:30 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 1 Feb 2009 03:34:30 -0500
Subject: Searching a file for multiple strings (PS)
In-Reply-To: <6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com>
	<mailman.8503.1233463160.3487.python-list@python.org>
	<6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
Message-ID: <2dc0c81b0902010034p102cd9c2t2e20d656cb22fd9d@mail.gmail.com>

On Sun, Feb 1, 2009 at 1:14 AM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 1, 3:39 pm, Shawn Milochik <Sh... at Milochik.com> wrote:
>
>> Not to discourage the use of Python, but it seems that fgrep with the
>> -f flag already does exactly what you want. If you're on Windows, you
>> can get the Windows version of fgrep here: http://unxutils.sourceforge.net/
>
> That URL is antique and a dead end. When you find the actual
> sourceforge project page (http://sourceforge.net/projects/unxutils/)
> and browse the forums and the CVS repository, you'll see tumbleweed
> blowing down Main Street and not much else (besides a few whinges
> about that dead end URL, and many unanswered issues).
>
> Alternative: http://gnuwin32.sourceforge.net/
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Thanks very much for the update. I had been using the older versions
(on the rare occasions I've had to use Windows). I didn't know there
was a currently-maintained version.


From mail at microcorp.co.za  Sun Feb  1 03:38:53 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 1 Feb 2009 10:38:53 +0200
Subject: SimpleXMLRPCServer question
References: <0ddb9364-02c9-4c52-aadb-e9d9b2d06b20@e1g2000pra.googlegroups.com><mailman.8423.1233375172.3487.python-list@python.org>
	<185b44c2-fc78-480f-8eb1-6395f7fe7ad7@x6g2000pre.googlegroups.com>
Message-ID: <021901c9844b$e41ba380$0d00a8c0@hendrik>


 "flagg" <iana...04 at gmail.com> wrote:


>Let me see if i can elaborate on the requirements.  I have 20+
>different zone files.  I want the xmlrpc server to be able to
>determine what zone file to open by looking at the incoming xml
>request.  For example one of the functions I have now is to show a DNS
>record (I am using dnspython for most of this work)
>

This is a wrong move, it is too magical - see below

>If i send an xmlrpc request that uses the 'showRecord' function with
>params of 'oracle1.foo.bar.com'  I want to parse the "params" piece
>and then instruct the xml-rpc server to open foo.bar.com.zone for
>reading.  The reason why i was looking at do_Post() and _dispatch was
>to attempt to read the incoming params and do exactly that.
>
>Do you think there is an easier way of accomplishing this, than the
>way I am going about it?

Yes I do.

Why don't you split the functionality into two bits - exactly as if you were
doing
it locally:

- OpenTheThing(whatOrWhere)
- ReadTheRecordAndShowIt(PossiblyWhichRecord)

If it's a remote database you are accessing, then you may need even more
steps, like first doing some select, or whatever - I would get it running
locally, calling local functions directly on the server, and then make them
remote xmlrpc proxy functions, after it's all working.

If you are getting the request from some user input, you can either change
the way you ask the questions, or you do the parsing at point of origen, to
determine what to call, in which sequence.

- Hendrik





From gagsl-py2 at yahoo.com.ar  Sun Feb  1 03:43:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 01 Feb 2009 06:43:43 -0200
Subject: Embedding numpy works once, but not twice??
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
Message-ID: <op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 03:47:27 -0200, Deepak Chandran  
<dchandran1 at tinkercell.com> escribi?:

> I have a program in which I have successfully embedded Python. Now, I  
> want
> to include NumPy as well (and other modules). I am able to import numpy
> once. Then I close the python console in my program and then re-open it.
> When I try to import numpy for a second time, the program crashes. Below  
> is
> a simple version of the problem.

The problem is not with NumPy. You can't run Py_Initialize/Py_Finalize  
more than once. Python doesn't have any mechanism to un-initialize loaded  
modules, and any static data that NumPy had initialized the first time it  
is imported becomes invalid the second time.
Call Py_Initialize at the start of your program, and Py_Finalize at the  
end, never more than once.

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Sun Feb  1 03:56:31 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 00:56:31 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
	<6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
	<mailman.8511.1233477274.3487.python-list@python.org>
Message-ID: <3a6e40c1-da04-4c68-a6c4-fe373fbe3b72@p23g2000prp.googlegroups.com>

On Feb 1, 7:34?pm, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Sun, Feb 1, 2009 at 1:14 AM, John Machin <sjmac... at lexicon.net> wrote:
> > On Feb 1, 3:39 pm, Shawn Milochik <Sh... at Milochik.com> wrote:
>
> >> Not to discourage the use of Python, but it seems that fgrep with the
> >> -f flag already does exactly what you want. If you're on Windows, you
> >> can get the Windows version of fgrep here:http://unxutils.sourceforge.net/
>
> > That URL is antique and a dead end. When you find the actual
> > sourceforge project page (http://sourceforge.net/projects/unxutils/)
> > and browse the forums and the CVS repository, you'll see tumbleweed
> > blowing down Main Street and not much else (besides a few whinges
> > about that dead end URL, and many unanswered issues).
>
> > Alternative:http://gnuwin32.sourceforge.net/
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Thanks very much for the update. I had been using the older versions
> (on the rare occasions I've had to use Windows). I didn't know there
> was a currently-maintained version.

Read my lips: unxutils is *not* "currently-maintained". Use GnuWin32.


From ntwrkd at gmail.com  Sun Feb  1 04:09:13 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Sun, 1 Feb 2009 01:09:13 -0800
Subject: what IDE is the best to write python?
In-Reply-To: <fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <f257b9ab0902010109h3c102b29j166c7e8659d1cdab@mail.gmail.com>

Wingware IDE is pretty good. It's not free though.
http://www.wingware.com/

On Sun, Feb 1, 2009 at 12:14 AM, Stephen Hansen <apt.shansen at gmail.com> wrote:
> On Sat, Jan 31, 2009 at 11:42 PM, mcheung63 at hotmail.com
> <mcheung63 at hotmail.com> wrote:
>>
>> Hi all
>>   what IDE is the best to write python?
>> thanks
>> from Peter (mcheung63 at hotmail.com)
>
> What OS? And define "IDE"? Do you just want an editing environment with say
> class browsing capabilities or do you want an integrated debugger and such?
>
> On the mac, I actually like TextMate and Wing IDE -- both commercial(ish).
> TextMate is like a sex toy its so great to use, but recently I've started
> migrating to WingIDE for my work projects.
>
> For Windows, I used Stani's Python Editor. http://pythonide.blogspot.com/
>
> --S
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From lipun4u at gmail.com  Sun Feb  1 04:27:26 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 01:27:26 -0800 (PST)
Subject: Handle SystemExit exception
Message-ID: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>

My program contains some sys.exit(1) and when its executed an
exception known as SystemExit is thrown.

I tried to handle bu using following code snippet

if __name__ == "__main__":
    try:
        main()  #main contains sys.exit(1)
    except KeyboardInterrupt:
        print "aborted by user"
    except SystemExit:
        pass

But it does not work.

Can anyone help me out ???

Though KeyboradInterrupt is handled, but why SystemExit is not
handles ????

Regards
Asit Dhal


From steve at pearwood.info  Sun Feb  1 04:32:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:32:58 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
Message-ID: <0195625a$0$23675$c3e8da3@news.astraweb.com>

Paul Rubin wrote:

> Steven D'Aprano <steve at pearwood.info> writes:
>> First question is, why do you care that it's slower? The difference
>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>> microsecond.
> 
> That's a 71% speedup, pretty good if you ask me.

Don't you care that the code is demonstrably incorrect? The OP is
investigating options to use in Python 3, but the fastest method will fail,
because the "type is InstanceType" test will no longer work. (I believe the
fastest method, as given, is incorrect even in Python 2.x, as it will
accept ANY old-style class instead of just the relevant X or V classes.)

That reminds me of something that happened to my wife some years ago: she
was in a van with her band's roadies, and one asked the driver "Are you
sure you know where you're going?", to which the driver replied, "Who
cares? We're making great time." (True story.)

If you're going to accept incorrect code in order to save time, then I can
write even faster code:

def func4(ob):
    pass

Trying beating that for speed!


>> If you call the slowest function one million times, your code will
>> run less than a second longer.
> 
> What if you call it a billion times, or a trillion times, or a
> quadrillion times, you see where this is going?

It doesn't matter. The proportion of time saved will remain the same. If you
run it a trillion times, you'll save 12 minutes in a calculation that takes
278 hours to run. Big Effing Deal. Saving such trivial amounts of time is
not worth the cost of hard-to-read or incorrect code.

Of course, if you have profiled your code and discovered that *significant*
amounts of time are being used in type-testing, *then* such a
micro-optimization may be worth doing. But I already allowed for that:

"Does that really matter...?"
(the answer could be Yes)

"Unless you have profiled your code and this really is a bottleneck ..."
(it could be)


> If you're testing 
> 100-digit numbers, there are an awful lot of them before you run out.

Yes. So what? Once you've tested them, then what? If *all* you are doing
them is testing them, your application is pretty boring. Even a print
statement afterwards is going to take 1000 times longer than doing the
type-test. In any useful application, the amount of time used in
type-testing is almost surely going to be a small fraction of the total
runtime. A 71% speedup on 50% of the runtime is significant; but a 71%
speedup on 0.1% of the total execution time is not.



-- 
Steven



From gagsl-py2 at yahoo.com.ar  Sun Feb  1 04:45:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 01 Feb 2009 07:45:30 -0200
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
Message-ID: <op.uon2p42fx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 07:27:26 -0200, asit <lipun4u at gmail.com> escribi?:

> My program contains some sys.exit(1) and when its executed an
> exception known as SystemExit is thrown.

This is normal behaviour - but you should not "see" the SystemExit. Do you  
mean that a stack trace appears in the console?

> I tried to handle bu using following code snippet
>
> if __name__ == "__main__":
>     try:
>         main()  #main contains sys.exit(1)
>     except KeyboardInterrupt:
>         print "aborted by user"
>     except SystemExit:
>         pass
>
> But it does not work.

I've tested adding this:

def main():
   sys.exit(1)

and it exited normally, even after removing the SystemExit clause.

> Can anyone help me out ???
>
> Though KeyboradInterrupt is handled, but why SystemExit is not
> handles ????

Perhaps there is another try/except somewhere else that handles SystemExit?
Look for bare except clauses, like

try:
except: ...

They should *not* be used. With Python 2.5 and above, theh "catch-all"  
should be written as:

try:
except Exception: ...

If you are using 2.4 or earlier, should be:

try:
except (SystemExit, KeyboardInterrupt): raise
except: ...

-- 
Gabriel Genellina



From steve at pearwood.info  Sun Feb  1 04:46:20 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:46:20 +1100
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
Message-ID: <0195657c$0$20662$c3e8da3@news.astraweb.com>

asit wrote:

> My program contains some sys.exit(1) and when its executed an
> exception known as SystemExit is thrown.
> 
> I tried to handle bu using following code snippet
> 
> if __name__ == "__main__":
>     try:
>         main()  #main contains sys.exit(1)
>     except KeyboardInterrupt:
>         print "aborted by user"
>     except SystemExit:
>         pass
> 
> But it does not work.

It works for me:

>>> try:
...     sys.exit()
... except SystemExit:
...     pass
... 
>>> 


What does it do for you? Crash? Exit? print garbage to the screen?


I'm going to guess what you are doing. Do you have code like this?

try:
    main()  #main contains sys.exit(1)
except KeyboardInterrupt:
    print "aborted by user"
except SomeOtherException, SystemExit:
    pass

This will mask SystemExit and stop it from being caught. It should be
written like this:

except (SomeOtherException, SystemExit):
    pass



Or possibly something like this?

try:
    main()  #main contains sys.exit(1)
except KeyboardInterrupt:
    print "aborted by user"
except Exception:
    do_something()
    raise
except SystemExit:
    pass

The Exception clause will catch SystemExit before the SystemExit clause will
see it. That should be written like this:


except SystemExit:
    pass
except Exception:
    do_something()
    raise




-- 
Steven



From steve at pearwood.info  Sun Feb  1 04:51:47 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:51:47 +1100
Subject: Please help to play 5 jpegs as a slideshow in JES(Jython) ---
	BEGINNER.
References: <28dec764-64e4-4a47-87d5-ba3b52e3b051@r36g2000prf.googlegroups.com>
Message-ID: <019566c3$0$20644$c3e8da3@news.astraweb.com>

steve at savechicago.org wrote:

> Hello, I am a brand brand new programming student in Jython and I have
> been working on a simple homework assignment in JES for the last 12
> hours and am completely lost.
> 
> Basically, we have to make a jpeg slideshow with 5 different pictures
> with audio background that lasts 60 seconds. I have absolutely no idea
> where to begin and am more lost than I was 12 hours ago.
> 
> 
> 
> def pickAndShow():
> 
> myfile = pickAFile()
> mypicture = makePicture(myfile)
> show(mypicture)
> 
> I know this is how to call up a picture from your hard drive. That?s
> about all I know. I have no idea how to call up 5 of them, one at a
> time, and with audio in the background. 

If you can call up *one* picture, then you should be able to call up a
second one, then a third, then a fourth, then a fifth, and then you're
done.


-- 
Steven



From lipun4u at gmail.com  Sun Feb  1 05:29:54 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 02:29:54 -0800 (PST)
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
	<0195657c$0$20662$c3e8da3@news.astraweb.com>
Message-ID: <d51192af-47ec-474f-9123-df496b76a1ba@a39g2000prl.googlegroups.com>

Thanx everyone

This is my fault. Exception was thrown before the main function.


From lipun4u at gmail.com  Sun Feb  1 05:34:39 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 02:34:39 -0800 (PST)
Subject: exception in urllib2
Message-ID: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>

I hv been developing a link scanner. Here the objective is to
recursively scan a particular web site.

During this, my script met http://images.google.co.in/imghp?hl=en&tab=wi
and passed it to the scan function, whose body is like this..

def scan(site):
    log=open(logfile,'a')
    log.write(site + "\n")
    site = "http://" + site.lower()
    try:
        site_data = urllib.urlopen(site)
        parser = MyParser()
        parser.parse(site_data.read())
    except(IOError),msg:
        print "Error in connecting site ", site
        print msg
    links = parser.get_hyperlinks()
    for l in links:
        log.write(l + "\n")

But it throws a weird exception like this...

Traceback (most recent call last):
  File "I:\Python26\linkscan1.py", line 104, in <module>
    main()
  File "I:\Python26\linkscan1.py", line 95, in main
    scan(lk)
  File "I:\Python26\linkscan1.py", line 65, in scan
    site_data = urllib.urlopen(site)
  File "I:\Python26\lib\urllib.py", line 87, in urlopen
    return opener.open(url)
  File "I:\Python26\lib\urllib.py", line 203, in open
    return getattr(self, name)(url)
  File "I:\Python26\lib\urllib.py", line 327, in open_http
    h = httplib.HTTP(host)
  File "I:\Python26\lib\httplib.py", line 984, in __init__
    self._setup(self._connection_class(host, port, strict))
  File "I:\Python26\lib\httplib.py", line 656, in __init__
    self._set_hostport(host, port)
  File "I:\Python26\lib\httplib.py", line 668, in _set_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
httplib.InvalidURL: nonnumeric port: ''

How can i handle this ???


From bbxx789_05ss at yahoo.com  Sun Feb  1 06:00:18 2009
From: bbxx789_05ss at yahoo.com (7stud)
Date: Sun, 1 Feb 2009 03:00:18 -0800 (PST)
Subject: exception in urllib2
References: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>
Message-ID: <5ce2bf59-7923-457c-8141-e3ab65e531cd@y23g2000pre.googlegroups.com>

On Feb 1, 3:34?am, asit <lipu... at gmail.com> wrote:
> I hv been developing a link scanner. Here the objective is to
> recursively scan a particular web site.
>
> During this, my script methttp://images.google.co.in/imghp?hl=en&tab=wi
> and passed it to the scan function, whose body is like this..
>
> def scan(site):
>

So you have this:

site=http://images.google.co.in/imghp?hl=en&tab=wi

??



> ? ? log=open(logfile,'a')
> ? ? log.write(site + "\n")
> ? ? site = "http://" + site.lower()
>

So now:

site = "http://" + "http://images.google.co.in/imghp?hl=en&tab=wi"

Hmmm...let's see what happens when I run the following program:


import urllib

site = "http://" + "http://images.google.co.in/imghp?hl=en&tab=wi"
html = urllib.urlopen(site)

--output:--
Traceback (most recent call last):
  File "6test.py", line 4, in ?
    html = urllib.urlopen(site)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 82, in urlopen
    return opener.open(url)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 190, in open
    return getattr(self, name)(url)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 303, in open_http
    h = httplib.HTTP(host)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 1097, in __init__
    self._setup(self._connection_class(host, port, strict))
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 586, in __init__
    self._set_hostport(host, port)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 598, in _set_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
httplib.InvalidURL: nonnumeric port: ''




From bbxx789_05ss at yahoo.com  Sun Feb  1 06:20:26 2009
From: bbxx789_05ss at yahoo.com (7stud)
Date: Sun, 1 Feb 2009 03:20:26 -0800 (PST)
Subject: exception in urllib2
References: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>
Message-ID: <81681f17-4b92-46b5-9875-a1b8ae191ae5@v18g2000pro.googlegroups.com>

On Feb 1, 3:34?am, asit <lipu... at gmail.com> wrote:
> I hv been developing a link scanner. Here the objective is to
> recursively scan a particular web site.
>
> During this, my script methttp://images.google.co.in/imghp?hl=en&tab=wi
> and passed it to the scan function, whose body is like this..
>
> def scan(site):
> ? ? log=open(logfile,'a')
> ? ? log.write(site + "\n")
> ? ? site = "http://" + site.lower()
> ? ? try:
> ? ? ? ? site_data = urllib.urlopen(site)
> ? ? ? ? parser = MyParser()
> ? ? ? ? parser.parse(site_data.read())
> ? ? except(IOError),msg:
> ? ? ? ? print "Error in connecting site ", site
> ? ? ? ? print msg
> ? ? links = parser.get_hyperlinks()
> ? ? for l in links:
> ? ? ? ? log.write(l + "\n")
>
> But it throws a weird exception like this...
>
> Traceback (most recent call last):
> ? File "I:\Python26\linkscan1.py", line 104, in <module>
> ? ? main()
> ? File "I:\Python26\linkscan1.py", line 95, in main
> ? ? scan(lk)
> ? File "I:\Python26\linkscan1.py", line 65, in scan
> ? ? site_data = urllib.urlopen(site)
> ? File "I:\Python26\lib\urllib.py", line 87, in urlopen
> ? ? return opener.open(url)
> ? File "I:\Python26\lib\urllib.py", line 203, in open
> ? ? return getattr(self, name)(url)
> ? File "I:\Python26\lib\urllib.py", line 327, in open_http
> ? ? h = httplib.HTTP(host)
> ? File "I:\Python26\lib\httplib.py", line 984, in __init__
> ? ? self._setup(self._connection_class(host, port, strict))
> ? File "I:\Python26\lib\httplib.py", line 656, in __init__
> ? ? self._set_hostport(host, port)
> ? File "I:\Python26\lib\httplib.py", line 668, in _set_hostport
> ? ? raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
> httplib.InvalidURL: nonnumeric port: ''
>
> How can i handle this ???

"Handle" as in how do I catch that exception?  The exception's name is
give in the error message.  Look at the last line.  To catch that
exception, you can do this:

import httplib   #that's the module the exception lives in
                 #as indicated in error message

try:
    ....
    ....
    ....
except httplib.InvalidURL, e:
    print e
    print "Bad url"






From hubaghdadi at gmail.com  Sun Feb  1 06:22:36 2009
From: hubaghdadi at gmail.com (Hussein B)
Date: Sun, 1 Feb 2009 03:22:36 -0800 (PST)
Subject: What is wrong in my list comprehension?
Message-ID: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>

Hey,
I have a log file that doesn't contain the word "Haskell" at all, I'm
just trying to do a little performance comparison:
++++++++++++++
from datetime import time, timedelta, datetime
start = datetime.now()
print start
lines = [line for line in file('/media/sda4/Servers/Apache/
Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
print 'Number of lines contains "Haskell" = ' +  str(len(lines))
end = datetime.now()
print end
++++++++++++++
Well, the script is returning the whole file's lines number !!
What is wrong in my logic?
Thanks.


From a at nospam.org  Sun Feb  1 06:35:52 2009
From: a at nospam.org (Armin)
Date: Sun, 01 Feb 2009 12:35:52 +0100
Subject: py2exe + SQLite problem
In-Reply-To: <mailman.8467.1233414964.3487.python-list@python.org>
References: <mailman.7802.1232715395.3487.python-list@python.org>	<54542453-3479-4953-94c7-b9df50714761@k36g2000pri.googlegroups.com>	<mailman.7815.1232725996.3487.python-list@python.org>	<glsgi3$oln$1@online.de>	<mailman.8317.1233270751.3487.python-list@python.org>	<glupg7$pad$1@online.de>	<mailman.8363.1233320984.3487.python-list@python.org>	<gm1kv5$aqh$1@online.de>
	<mailman.8467.1233414964.3487.python-list@python.org>
Message-ID: <gm41d1$f70$1@online.de>


Hello,

Thanks to all ... it's working now !

Google isn't always your friend :) I found in the net a lot but wrong 
examples for specification of "data_files". Now I have the correct one.

Best Regards

--Armin



Gabriel Genellina wrote:
> En Sat, 31 Jan 2009 11:51:16 -0200, Armin <a at nospam.org> escribi?:
>> Gabriel Genellina wrote:
>>> En Fri, 30 Jan 2009 09:50:08 -0200, Armin <a at nospam.org> escribi?:
> 
>>>  Right at the end: "To install data files directly in the target 
>>> directory, an empty string should be given as the directory."
>>>  setup(...,
>>>       data_files=[
>>>            ('', ['list/of/file/names', 
>>> 'perhaps/including/source/directory']),
>>>            ]
>>>      )
>>>
>> Yes ... so far the theory :)
>>
>> As posted before ... set's my script (python 2.3):
> 
> You didn't tell us that you were using version 2.3 -- it's important, as 
> the current stable releases are 2.6 and 3.0. Anyway, this should work in 
> 2.3 too.
> 
>> from distutils.core import setup
>> import py2exe
>>
>> setup(windows=['dpconf.py'],
>>      data_files=[ "", ["proj_db","gsd_db","dachs2.xbm"]]
>>      )
>>
> 
> Comparing my example and yours, you lack a parenthesis level:
> 
> setup(windows=['dpconf.py'],
>       data_files=[("", ["proj_db","gsd_db","dachs2.xbm"])]
>       )
> 
>> When I create the distribution I got the following err msg:
>>
>> *** copy data files ***
>> warning: install_data: setup script did not provide a directory for '' 
>> -- installing right in 'C:\pyDPCONF.2.3-dev\dist'
>> error: can't copy '': doesn't exist or not a regular file
>>
>> Looks a little bit inconsistent ?
> 
> O thou of little faith, try again...
> 


From __peter__ at web.de  Sun Feb  1 06:37:00 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 01 Feb 2009 12:37:00 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
Message-ID: <gm41gr$c6i$01$1@news.t-online.com>

Hussein B wrote:

> Hey,
> I have a log file that doesn't contain the word "Haskell" at all, I'm
> just trying to do a little performance comparison:
> ++++++++++++++
> from datetime import time, timedelta, datetime
> start = datetime.now()
> print start
> lines = [line for line in file('/media/sda4/Servers/Apache/
> Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
> print 'Number of lines contains "Haskell" = ' +  str(len(lines))
> end = datetime.now()
> print end
> ++++++++++++++
> Well, the script is returning the whole file's lines number !!
> What is wrong in my logic?
> Thanks.

"""
find(...)
    S.find(sub [,start [,end]]) -> int

    Return the lowest index in S where substring sub is found,
    such that sub is contained within s[start:end].  Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
"""

a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
context.

Use

[line for line in open(...) if line.find("Haskell") != -1]

or, better

[line for line in open(...) if "Haskell" in line]

to get the expected result.

Peter


From clp2 at rebertia.com  Sun Feb  1 06:39:06 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 03:39:06 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902010339r4d3cdd85n5060f74515f8d28c@mail.gmail.com>

On Sun, Feb 1, 2009 at 3:22 AM, Hussein B <hubaghdadi at gmail.com> wrote:
> Hey,
> I have a log file that doesn't contain the word "Haskell" at all, I'm
> just trying to do a little performance comparison:
> ++++++++++++++
> from datetime import time, timedelta, datetime
> start = datetime.now()
> print start
> lines = [line for line in file('/media/sda4/Servers/Apache/
> Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]

>From the help() for str.find:
find(...)
<snip>
    Return -1 on failure.

~ $ python
Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
[GCC 4.0.1 (Apple Inc. build 5484)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> bool(-1)
True

str.find() returns -1 on failure (i.e. if the substring is not in the
given string).
-1 is considered boolean true by Python.
Therefore, your list comprehension will contain all lines that don't
*start* with "Haskell" rather than all lines that don't *contain*
"Haskell".

Use `if "Haskell" in line` instead of `if line.find("Haskell")`. It's
even easier to read that way.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jstroud at mbi.ucla.edu  Sun Feb  1 06:39:27 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 01 Feb 2009 03:39:27 -0800
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <2Nfhl.9862$8_3.3929@flpi147.ffdc.sbc.com>

mcheung63 at hotmail.com wrote:
> Hi all
>    what IDE is the best to write python?
> thanks
> from Peter (mcheung63 at hotmail.com)

vim in one terminal, ipython in the other.

-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA  90095

http://www.jamesstroud.com


From johan.de.taeye at gmail.com  Sun Feb  1 06:52:58 2009
From: johan.de.taeye at gmail.com (jdetaeye)
Date: Sun, 1 Feb 2009 03:52:58 -0800 (PST)
Subject: Embedded python 2.6 interpreter can't "import sqlite3" on Windows XP
Message-ID: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>


I am porting an application which embeds a Python interpreter to
Python 2.6.
On version 2.5 all is working fine, but importing the sqlite3 module
doesn't work any more on 2.6.

The statement  "import sqlite3" does work fine when executed from in
the python command prompt, ie not from the embedded interpreter.
The same import gives the following error when executed from the
embedded interpreter.
   Python stacktrace:
       Traceback (most recent call last):
         File "<string>", line 2, in <module>
         File "C:\Python26\lib\sqlite3\__init__.py", line 24, in
<module>
           from dbapi2 import *
         File "C:\Python26\lib\sqlite3\dbapi2.py", line 27, in
<module>
           from _sqlite3 import *
       ImportError: DLL load failed: A dynamic link library (DLL)
initialization routine failed.
   Windows popup window:
       Runtime Error!
       R6034
       An application has made an attempt to load the C runtime
library incorrectly.
       Please contact the application's support team for more
information.

Unfortunately the "application support team" (that is me :-) has no
idea on how to move forward on this:
a) I guess this is releated to the problem with manifest files,
already reported in http://bugs.python.org/issue4120 ?
b) What could be a solution or workaround for the problem?

All the above is on Windows XP.
Other modules with have an extension DLL (such as ssl) give exactly
the same problem.

All help appreciated,

Johan



From nemesis at nowhere.invalid  Sun Feb  1 07:04:09 2009
From: nemesis at nowhere.invalid (Nemesis)
Date: 01 Feb 2009 12:04:09 GMT
Subject: [ANN] XPN 1.2.6
Message-ID: <49858fb9$0$1110$4fafbaef@reader3.news.tin.it>

XPN (X Python Newsreader) is a multi-platform newsreader with Unicode
support. It is written with Python+GTK. It has features like
scoring/actions, X-Face and Face decoding, muting of quoted text,
newsrc import/export, find article and search in the body, spoiler
char/rot13, random taglines and configurable attribution lines.

You can find it on:

http://xpn.altervista.org/index-en.html

or

http://sf.net/projects/xpn


Changes in this release:

    * v1.2.6: Now threads with unread watched articles are underlined
    * v1.2.6: added a visualization option that lets you hide threads without
              watched articles
    * v1.2.6: fixed a bug that caused XPN not to kill old articles reapplying rules
    * v1.2.6: fixed a bug that caused crashes when using ID with extended chars

XPN is translated in Italian French and German, if you'd like to translate it
in your language and you are familiar with gettext and po-files
editing please contact me (xpn at altervista.org).
-- 
To succeed in the world it is not enough to be stupid, you must also be
well-mannered.
 _  _                  _
| \| |___ _ __  ___ __(_)___
| .` / -_) '  \/ -_|_-< (_-<
|_|\_\___|_|_|_\___/__/_/__/ http://xpn.altervista.org



From matthewbdaly at googlemail.com  Sun Feb  1 07:07:05 2009
From: matthewbdaly at googlemail.com (MattBD)
Date: Sun, 1 Feb 2009 04:07:05 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>

On Feb 1, 7:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?
> thanks
> from Peter (mcheun... at hotmail.com)

I like Vim, that works really well for me when coding in Python.
Enable syntax highlighting and it's a great development environment.
It's a little tough at first but run vimtutor and you'll soon start to
get the hang of it.

IMHO, scripting languages like Python are generally better suited to
working with a text editor than an IDE.


From stef.mientki at gmail.com  Sun Feb  1 07:19:04 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 13:19:04 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
Message-ID: <49859338.2000105@gmail.com>


> IMHO, scripting languages like Python are generally better suited to
> working with a text editor than an IDE.
>   
I don't understand that, because in my opinion yields
  IDE = texteditor + (much) more
please could you explain (as I'm very interested in user interfaces in 
general )

cheers,
Stef


From robin at NOSPAMreportlab.com  Sun Feb  1 07:33:36 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Sun, 01 Feb 2009 12:33:36 +0000
Subject: fastest way to detect a user type
In-Reply-To: <0195625a$0$23675$c3e8da3@news.astraweb.com>
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
	<0195625a$0$23675$c3e8da3@news.astraweb.com>
Message-ID: <498596A0.6030005@jessikat.plus.net>

Steven D'Aprano wrote:
> Paul Rubin wrote:
> 
>> Steven D'Aprano <steve at pearwood.info> writes:
>>> First question is, why do you care that it's slower? The difference
>>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>>> microsecond.
>> That's a 71% speedup, pretty good if you ask me.
> 
> Don't you care that the code is demonstrably incorrect? The OP is
> investigating options to use in Python 3, but the fastest method will fail,
> because the "type is InstanceType" test will no longer work. (I believe the
> fastest method, as given, is incorrect even in Python 2.x, as it will
> accept ANY old-style class instead of just the relevant X or V classes.)

I'm not clear why this is true? Not all instances will have the __X__ 
attribute or has something else changed in Python3?

The original code was intended to be called with only a subset of all 
class instances being passed as argument; as currently written it was 
unsafe because an instance of an arbitrary old class would pass into 
branch 1. Of course it will still be unsafe as arbitrary instances end 
up in branch 3

The intent is to firm up the set of cases being accepted in the first 
branch. The problem is that when all instances are new style then 
there's no easy check for the other acceptable arguments eg float,int, 
str etc, as I see it, the instances must be of a known class or have a 
distinguishing attribute.

As for the timing, when I tried the effect of func1 on our unit tests I 
noticed that it slowed the whole test suite by 0.5%. Luckily func 3 
style improved things by about 0.3% so that's what I'm going for.
-- 
Robin Becker


From steve at holdenweb.com  Sun Feb  1 07:45:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 07:45:42 -0500
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <49855129.9070901@shopzeus.com>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
Message-ID: <gm45hn$sbf$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>> 8<------------------------------
>>
>>  
>>> .......  Setting the
>>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>>> though).
>>>     
>>
>> Why not?  I have been merrily setting it, and I have not noticed
>> anything weird.
>> (yet)
>>   
> Please see my original post. I specifically stated that I do not want to
> use setsockopt and be able to listen on the same port from many
> processes. I knew that I could use SO_REUSEADDR, but I'm heistating to
> do so. I must guarantee that only one process listens on a given port at
> the same time.
> 
This appears to demonstrate a misunderstanding of the purpose of the
SO_REUSEADDR flag.

SO_REUSEADDR should be used to avoid the TIME_WAIT state when the
current listening process terminates. If you do not use it then there
will be a certain period during which no other process can listen on
that port, and it will be reusable only after the TIME_WAIT is over.
This can easily be seen by using the netstat utility.

See "Pitfall 3" in

http://www.ibm.com/developerworks/linux/library/l-sockpit/index.html

> Maybe I could use some kind of locking, but it would be too difficult:
> 
> - mutexes are great but they are platform dependent and they are not in
> the standard lib
> - the listening processes do not see each other's home directory so file
> locking cannot be used for this
> - these processes will probably listen on many ports at the same time,
> it is also a problem with mutexes/file locks (who wants 50 lock files to
> be created?)
> 
Complete red herring:  there is no way for multiple processes to listen
to the same port: this would lead to ambiguity in the protocol stack.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From notvalid2 at sbcglobal.net  Sun Feb  1 07:47:00 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Sun, 01 Feb 2009 04:47:00 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8488.1233440963.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>
	<mailman.8488.1233440963.3487.python-list@python.org>
Message-ID: <_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> r wrote:
>>>>> On Jan 28, 10:12 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>>> Where in the world is a description of pack() for Tkinter widgets?
>>>>>> Is it
>>>>>> some sort of general method for all widgets? I'm looking in a few
>>>>>> docs that
>>>>>> use it without ever saying where it is described. For one,
>>>>>> <http://effbot.org/tkinterbook/label.htm>. In the NM Tech pdf on
>>>>>> Tkinter,
>>>>>> it's not found anywhere. I see Universal methods for widgets, but no
>>>>>> mention
>>>>>> of pack(). package, packed, but no pack.
>>>>> did you try here :)
>>>>> http://effbot.org/tkinterbook/pack.htm
>>>> Thanks. I have the site bookmarked, but it's hard to search. I posted a
>>>> comment to them that they should have it in pdf form.
>>>>
>>> http://letmegooglethatforyou.com/?q=site%3Aeffbot.org%2Ftkinterbook+pack
>>>
>>> regards
>>>  Steve
>> Well, that's an interesting "link". Another side of Google facilities?
>> Maybe you're using Snagit or its brethern? However, I'm interested in
>> searching a pdf, which, of course, doesn't yet exist.
>>
> OK, someone asked if you'd seen the HTML pages. You replied that you had
> them bookmarked but they were difficult to search. So I simply
> demonstrated that a search of the site for "pack" gave the right page as
> its first result.
> 
> Maybe you *do* want a PDF, but it will be less searchable than the
> existing HTML, so I am somewhat confused about why.
> 
> regards
>  Steve
So what are you telling me? I should use Google to search the web site? If 
so, I guess I missed the method you used. Apparently, it hinges on the key 
"site:" The use of your video tool camouflaged your intent, IMHO.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From clp2 at rebertia.com  Sun Feb  1 07:53:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 04:53:20 -0800
Subject: is python Object oriented??
In-Reply-To: <325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<mailman.8294.1233249573.3487.python-list@python.org>
	<cdb67709-47fa-401f-b85c-4c0f19f4a8f6@p2g2000prf.googlegroups.com>
	<mailman.8348.1233296162.3487.python-list@python.org>
	<325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
Message-ID: <50697b2c0902010453r6a2e7ef4ma6870cbe38032e83@mail.gmail.com>

On Sat, Jan 31, 2009 at 9:08 AM,  <thmpsn.m.k at gmail.com> wrote:
> On Jan 30, 12:15 am, Chris Rebert <c... at rebertia.com> wrote:
>> - Python supports encapsulation. Prefixing an attribute/method with an
>> underscore indicates that other programmers should treat it as
>> 'private'. However, unlike B&D languages, Python itself does nothing
>> to enforce this privacy, leaving it instead to the good judgement of
>> the programmer, under the philosophy that "We're all consenting adults
>> here".
>
> How do you know? (I know I'm not.)
>
> Seriously, though, the lack of private members does allow for ugly
> hacks in user code, and you know there are always ugly hackers.

Marc already addressed your points excellently, but I'll add that I
once read somewhere (can't be bothered to find the source, PG maybe?)
that mediocre programming languages are designed for average
programmers and presume the language designers are smarter than the
programmer, whereas the truly great languages are designed for great
programmers and presume that the programmer is smarter than (or at
least knows better than) the designer.

This allows smart programmers using great languages to say: "I don't
like X about the language, I think I'll change it" or "The language
needs Y, I'll add it". For example, see the amazing magic some Python
people have worked using metaclasses.
Whereas smart programmers using a mediocre language are stuck: "I
don't like X about the language and there's nothing I can do about it
short of hacking the language implementation. Darn. Now I'm going to
have to write Y lines every time I want to workaround X since the
language doesn't let me factor the solution out any further! (sigh)".
For example, consider looping through an array in Java before the new
'for' statement was added.

Therefore, Python wisely chooses to not give a damn about how "ugly
hackers" may abuse the language; they'll abuse *any* language they get
their grubby mitts on; just let them and their ugly code quietly rot
in the corner while the elite are allowed by the language the extra
leeway they need to write their code masterpieces, which the common
people can then use to improve their programs.

Not that I'm saying any of us are necessarily elite; just don't be
/particularly/ stupid by using anything *clearly marked* with an
initial underscore without *extremely* good reason. And this isn't to
say the language shouldn't take average programmers into account; just
don't overly restrict the the 90% that are decent programmers in the
name of trying to save the bottom 10% from themselves (it's rather
like the "Save the Children!" retort on /.)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Sun Feb  1 07:58:58 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 07:58:58 -0500
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <49855129.9070901@shopzeus.com>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
Message-ID: <gm46aj$ucc$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>> 8<------------------------------
>>
>>  
>>> .......  Setting the
>>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>>> though).
>>>     
>>
>> Why not?  I have been merrily setting it, and I have not noticed
>> anything weird.
>> (yet)
>>   
> Please see my original post. I specifically stated that I do not want to
> use setsockopt and be able to listen on the same port from many
> processes. I knew that I could use SO_REUSEADDR, but I'm heistating to
> do so. I must guarantee that only one process listens on a given port at
> the same time.

My previous reply assumed you are running some UNIX-like operating
system. If you are on Windows then Jean-Paul's advice stands, as Windows
*does* allow several processes to listen on the same port and randomly
delivers incoming connections to one of the listening processes.

I believe this is because Microsoft failed to understand the original
meaning of SO_REUSEADDR for their early TCP implementations, and
persisted with this ghastly error in the name of backwards
compatibility, justifying it by suggesting that listener pools could be
created. Or some such nonsense. Perhaps someone with more insight into
the development process could comment. It seems to me it's completely
bizarre.

However, under Windows 2000 and later you should find there's an
SO_EXCLUSIVEADDRUSE flag which you can use to ensure a single listener -
see http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx. No
need for separate locks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 08:00:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 08:00:42 -0500
Subject: accessing elements of a tuple
In-Reply-To: <0195522e$0$31512$c3e8da3@news.astraweb.com>
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <gm46dq$ucc$2@ger.gmane.org>

Steven D'Aprano wrote:
> D'Arcy J.M. Cain wrote:
> 
>> First of all, list is a reserved word.  Don't use it as a variable name.
> 
> Unless you mean to. Shadowing built-ins is only a bad thing when you do it
> by accident.
> 
Quite. And we should observe that "list" is not a reserved word in the
sense of a keyword with a specific syntactic meaning, otherwise it
wouldn't be possible to shadow it in the first place. It's just the name
of one of Python's built-in types.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From p-santoro at sbcglobal.net  Sun Feb  1 08:20:50 2009
From: p-santoro at sbcglobal.net (Peter)
Date: Sun, 01 Feb 2009 08:20:50 -0500
Subject: Embedded python 2.6 interpreter can't "import sqlite3" on Windows
	XP
In-Reply-To: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>
References: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>
Message-ID: <Ukhhl.6113$jZ1.3039@flpi144.ffdc.sbc.com>

jdetaeye wrote:
> I am porting an application which embeds a Python interpreter to
> Python 2.6.
> On version 2.5 all is working fine, but importing the sqlite3 module
> doesn't work any more on 2.6.
> 
> The statement  "import sqlite3" does work fine when executed from in
> the python command prompt, ie not from the embedded interpreter.
> The same import gives the following error when executed from the
> embedded interpreter.
>    Python stacktrace:
>        Traceback (most recent call last):
>          File "<string>", line 2, in <module>
>          File "C:\Python26\lib\sqlite3\__init__.py", line 24, in
> <module>
>            from dbapi2 import *
>          File "C:\Python26\lib\sqlite3\dbapi2.py", line 27, in
> <module>
>            from _sqlite3 import *
>        ImportError: DLL load failed: A dynamic link library (DLL)
> initialization routine failed.
>    Windows popup window:
>        Runtime Error!
>        R6034
>        An application has made an attempt to load the C runtime
> library incorrectly.
>        Please contact the application's support team for more
> information.
> 
> Unfortunately the "application support team" (that is me :-) has no
> idea on how to move forward on this:
> a) I guess this is releated to the problem with manifest files,
> already reported in http://bugs.python.org/issue4120 ?
> b) What could be a solution or workaround for the problem?
> 
> All the above is on Windows XP.
> Other modules with have an extension DLL (such as ssl) give exactly
> the same problem.
> 
> All help appreciated,
> 
> Johan
> 

Python 2.6+ was built with Visual Studio 2008; therefore, the Microsoft 
Visual C++ 2008 Redistributable Package (run time libraries) must be 
installed on the computer that you are trying to run your python 
application.  If the computer already has Python 2.6+ installed "for all 
users", then the run time libraries should already be installed in 
c:\windows\winsxs.  On computers that do not have Python 2.6+ installed 
(or it was installed using "Install Just for Me"), you probably will 
need to install the Visual C++ 2008 Redistributable Package.  It is 
possible that some other application already installed the correct run 
time libraries in the c:\windows\winsxs directory.

Visual C++ 2008 Redistributable Package:
http://www.microsoft.com/downloads/details.aspx?FamilyID=9b2da534-3e03-4391-8a4d-074b9f2bc1bf&displaylang=en

After installing the Visual C++ 2008 Redistributable, you can find it 
under the c:\windows\winsxs directory.

Side-by-Side (sxs) Assemblies are Microsoft's answer to "DLL hell" and 
Visual C++ 2005 had them, too.  I believe the reason the Python 
community didn't see these problems earlier was that most computers 
already had the proper run time libraries installed.  See "Application 
Compatibility?Side-by-side Assemblies" in 
http://msdn.microsoft.com/en-us/magazine/cc302206.aspx and 
http://msdn.microsoft.com/en-us/magazine/ms997620.aspx for more 
information on Side-by-Side Assemblies.

Note that if future versions of Python are built with Visual Studio 2008 
with service pack (SP) #x and the build specifies that the SP #x updated 
run time libraries should be used, then you'll need to install the 
updated run time libraries.  See 
http://msdn.microsoft.com/en-us/library/cc664727.aspx and 
http://msdn.microsoft.com/en-us/library/ms235299(VS.80).aspx for more 
information on binding applications to specific run time libraries.

The following articles may also be of interest:

http://msdn.microsoft.com/en-us/library/ms235531.aspx
http://msdn.microsoft.com/en-us/library/ms235342.aspx
http://msdn.microsoft.com/en-us/library/aa374224.aspx

Of course everything I've just said may change with the next release of 
Python, because the Python maintainers are apparently looking at 
alternative ways around this issue.  Although I'm not a Microsoft fan, 
I'm not yet convinced that trying to work around Microsoft's winsxs 
requirements is a smart thing to do.

It might simplify things for python users and developers if the Python 
2.6+ installers always installed the VS C++ run time libraries into the 
winsxs directory.  Perhaps python tools that create embedded python 
applications could better document this issue, so that people using 
embedded applications will know that they have to install the proper run 
time libraries.  It's also possible that Microsoft will someday install 
these new Visual Studio 2008 run time libraries via their update service 
or a future service pack.

Peter


From matthewbdaly at googlemail.com  Sun Feb  1 08:25:53 2009
From: matthewbdaly at googlemail.com (MattBD)
Date: Sun, 1 Feb 2009 05:25:53 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<mailman.8517.1233490750.3487.python-list@python.org>
Message-ID: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>

On Feb 1, 12:19?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> > IMHO, scripting languages like Python are generally better suited to
> > working with a text editor than an IDE.
>
> I don't understand that, because in my opinion yields
> ? IDE = texteditor + (much) more
> please could you explain (as I'm very interested in user interfaces in
> general )
>
> cheers,
> Stef

Obviously, this is just my opinion. The great debate over which is
better, an IDE or text editor, has been going on for years, and no
doubt plenty of other people will disagree.

Really it depends what you are doing. Some languages are very tightly
integrated with an IDE, such as MS Visual C#, and as far as I can see
it would be extremely difficult, if not impossible to use a text
editor with that language. If you only use one language and that has
an IDE you like, there's nothing wrong with sticking with that.

IDE's are often (but not always) designed for a specific language.
Text editors are more flexible and will generally work well with
virtually any language. You may lose a little in terms of language-
specific functionality such as autocompletion and fancy graphical
tools, but you gain in flexibility because the one text editor will
work well with many languages, so you can write programs in C, Perl,
Python, Ruby, or whatever takes your fancy, and still use the same
tools you're used to, which I'd argue makes you more productive as
you're working within a familiar environment. However, there are IDE's
which support multiple languages, such as Eclipse.

Also, I'm strongly of the opinion that using a text editor when you
get started is the way to go. You're more likely to take in every last
detail of something if you type out the commands in detail rather than
using autocompletion. Also, an IDE can add an unnecessary level of
complication - as well as learning a language you have to learn an
IDE, which can be extremely complex. So it can be simpler to just use
a text editor, which is often simpler.

Conversely, IDE's can be better for designing interfaces as they
generally allow you to design them in a way that's more intuitive to
most people.

It's not exactly true to say that an IDE = text editor + much more.
It's more about the nature of the features. A modern programmer's text
editor such as Vim is an extremely powerful and flexible piece of
software. I've just barely started to scratch the surface of what Vim
can do and I learn something new virtually every time I use it.
Although technically it can mean you have to do more typing than you
would with an IDE, it also makes it a lot faster to type the text you
put in.

An IDE will roll everything you need into one package, including the
compiler/interpreter, editor and debugger. A text editor does the text
editing only, but in practice most of them allow you to access the
command line from within the text editor (in Vim you just enter :!
followed by the command you want to run), so you can use other tools
from within the editor. I do most of my coding in Linux, so I would
write a program in Vim, save it, then enter something like :!python
example.py to run it.

At the end of the day it's personal taste. I've tinkered with a few
IDE's but I find text editors work better for me at the end of the
day, and Vim in particular is one that really works well for me. It
does depend on what you're doing. For larger projects sometimes a
dedicated IDE is better, but most decent text editors can do a lot of
the same things that an IDE can. It just requires a different
approach.

I'd recommend you check out this article:
http://osteele.com/archives/2004/11/ides
That gives a good insight into the whole IDE's vs text editors thing.


From Platcool at gmail.com  Sun Feb  1 08:47:49 2009
From: Platcool at gmail.com (BlakeF)
Date: Sun, 1 Feb 2009 05:47:49 -0800 (PST)
Subject: persistent TCP connection in python using socketserver
References: <mailman.8299.1233255293.3487.python-list@python.org>
Message-ID: <5b7dce20-c707-4372-8af8-e403ce8de82a@y23g2000pre.googlegroups.com>

On Jan 29, 8:54?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 29 Jan 2009 08:38:43 -0800 (PST), markobrie... at gmail.com wrote:
> >G'day
>
> >I'm currently usingsocketserverto build a simple XMLSocket (an XML
> >based protocol used for communication between flash and the outside
> >world) server. I've got flash establishing a connection, sending a
> >request and my python server responding. However at this point
> >socketserverterminates the connection. Which is bad, since i need a
> >persistentconnection so i can push data from the server to the client
> >without the overhead of polling.
>
> If you don't want the connection to close, then don't let the request
> complete. ?SocketServerimplements logic for single request/response
> per connection. ?You can change this by making your requests take a
> really long time (until you're done with the connection) or you can
> override the behavior which closes the connection after a response.
>
> Or you could use the socket module, on which theSocketServermodule is
> based. ?Or you could use Twisted, another higher-level package built on
> the socket module (mostly). ?Actually, I recommend Twisted, since it will
> mostly isolate you from boring low-level details and let you implement
> whatever high-level behavior you're after (I know that a bunch of people
> have used it to communicate with Flash, for example).
>
> Jean-Paul

Hi,

Jean-Paul has something like this in mind (I think):

class Foobar(BaseRequestHandler):
  def handle(self):
    self.data = None
    while self.data != 'QUIT':
      self.data = self.request.recv(1024).strip().upper()
      if self.data == '':
        sleep(1)
      else:
        self.request.send(self.data)

This will keep a persistent connection, only closing on 'quit' being
received.  I'm sure it's not the best way, but it certainly works.

Cheers,
-Blake


From steve at holdenweb.com  Sun Feb  1 08:56:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 08:56:27 -0500
Subject: Tkinter w.pack()?
In-Reply-To: <_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>
	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
Message-ID: <gm49mb$7bj$1@ger.gmane.org>

W. eWatson wrote:
> Steve Holden wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> r wrote:
>>>>>> On Jan 28, 10:12 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>>>> Where in the world is a description of pack() for Tkinter widgets?
>>>>>>> Is it
>>>>>>> some sort of general method for all widgets? I'm looking in a few
>>>>>>> docs that
>>>>>>> use it without ever saying where it is described. For one,
>>>>>>> <http://effbot.org/tkinterbook/label.htm>. In the NM Tech pdf on
>>>>>>> Tkinter,
>>>>>>> it's not found anywhere. I see Universal methods for widgets, but no
>>>>>>> mention
>>>>>>> of pack(). package, packed, but no pack.
>>>>>> did you try here :)
>>>>>> http://effbot.org/tkinterbook/pack.htm
>>>>> Thanks. I have the site bookmarked, but it's hard to search. I
>>>>> posted a
>>>>> comment to them that they should have it in pdf form.
>>>>>
>>>> http://letmegooglethatforyou.com/?q=site%3Aeffbot.org%2Ftkinterbook+pack
>>>>
>>>>
>>>> regards
>>>>  Steve
>>> Well, that's an interesting "link". Another side of Google facilities?
>>> Maybe you're using Snagit or its brethern? However, I'm interested in
>>> searching a pdf, which, of course, doesn't yet exist.
>>>
>> OK, someone asked if you'd seen the HTML pages. You replied that you had
>> them bookmarked but they were difficult to search. So I simply
>> demonstrated that a search of the site for "pack" gave the right page as
>> its first result.
>>
>> Maybe you *do* want a PDF, but it will be less searchable than the
>> existing HTML, so I am somewhat confused about why.
>>
>> regards
>>  Steve
> So what are you telling me? I should use Google to search the web site?
> If so, I guess I missed the method you used. Apparently, it hinges on
> the key "site:" The use of your video tool camouflaged your intent, IMHO.
> 
The use of "letmegooglethatforyou" (not my video tool, by the way) is to
point out that with the right search string you could have answered the
question for yourself.

Since you didn't appear to know that Google allowed you to search a
single site (something I perhaps take for granted) I am glad that point
wasn't lost. Yes, you can just search the PIL documentation. Isn't the
Internet great? ;-)

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From fasteliteprogrammer at yahoo.com  Sun Feb  1 09:10:46 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Sun, 1 Feb 2009 06:10:46 -0800 (PST)
Subject: what IDE is the best to write python?
Message-ID: <531189.66795.qm@web36504.mail.mud.yahoo.com>

eclipse

--- On Sun, 2/1/09, Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:

From: Dennis Lee Bieber <wlfraed at ix.netcom.com>
Subject: Re: what IDE is the best to write python?
To: python-list at python.org
Date: Sunday, February 1, 2009, 3:31 AM

On Sat, 31 Jan 2009 23:42:42 -0800 (PST), "mcheung63 at hotmail.com"
<mcheung63 at hotmail.com> declaimed the following in comp.lang.python:

> Hi all
>? ? what IDE is the best to write python?

??? The one in which YOU are most comfortable.
-- 
??? Wulfraed??? Dennis Lee Bieber??? ??? KD6MOG
??? wlfraed at ix.netcom.com??? ??? wulfraed at bestiaria.com
??? ??? HTTP://wlfraed.home.netcom.com/
??? (Bestiaria Support Staff:??? ??? web-asst at bestiaria.com)
??? ??? HTTP://www.bestiaria.com/
--
http://mail.python.org/mailman/listinfo/python-list



      
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From darcy at druid.net  Sun Feb  1 09:32:42 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 1 Feb 2009 09:32:42 -0500
Subject: accessing elements of a tuple
In-Reply-To: <0195522e$0$31512$c3e8da3@news.astraweb.com>
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <20090201093242.199b7e8c.darcy@druid.net>

On Sun, 01 Feb 2009 19:23:58 +1100
Steven D'Aprano <steve at pearwood.info> wrote:
> D'Arcy J.M. Cain wrote:
> 
> > First of all, list is a reserved word. ?Don't use it as a variable name.
> 
> Unless you mean to. Shadowing built-ins is only a bad thing when you do it
> by accident.

I suppose but I am having a hard time trying to think of some good
reason to replace a builtin function that creates a list with a list
object.

>>> list = list((1,2,3))
>>> list((1,2,3))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'list' object is not callable

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From stef.mientki at gmail.com  Sun Feb  1 09:33:51 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 15:33:51 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
	<e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <4985B2CF.3080001@gmail.com>

thanks Matthew,
for the extended answer
and the great link,
I'm going to study that carefully.

cheers,
Stef


MattBD wrote:
> On Feb 1, 12:19 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>   
>>> IMHO, scripting languages like Python are generally better suited to
>>> working with a text editor than an IDE.
>>>       
>> I don't understand that, because in my opinion yields
>>   IDE = texteditor + (much) more
>> please could you explain (as I'm very interested in user interfaces in
>> general )
>>
>> cheers,
>> Stef
>>     
>
> Obviously, this is just my opinion. The great debate over which is
> better, an IDE or text editor, has been going on for years, and no
> doubt plenty of other people will disagree.
>
> Really it depends what you are doing. Some languages are very tightly
> integrated with an IDE, such as MS Visual C#, and as far as I can see
> it would be extremely difficult, if not impossible to use a text
> editor with that language. If you only use one language and that has
> an IDE you like, there's nothing wrong with sticking with that.
>
> IDE's are often (but not always) designed for a specific language.
> Text editors are more flexible and will generally work well with
> virtually any language. You may lose a little in terms of language-
> specific functionality such as autocompletion and fancy graphical
> tools, but you gain in flexibility because the one text editor will
> work well with many languages, so you can write programs in C, Perl,
> Python, Ruby, or whatever takes your fancy, and still use the same
> tools you're used to, which I'd argue makes you more productive as
> you're working within a familiar environment. However, there are IDE's
> which support multiple languages, such as Eclipse.
>
> Also, I'm strongly of the opinion that using a text editor when you
> get started is the way to go. You're more likely to take in every last
> detail of something if you type out the commands in detail rather than
> using autocompletion. Also, an IDE can add an unnecessary level of
> complication - as well as learning a language you have to learn an
> IDE, which can be extremely complex. So it can be simpler to just use
> a text editor, which is often simpler.
>
> Conversely, IDE's can be better for designing interfaces as they
> generally allow you to design them in a way that's more intuitive to
> most people.
>
> It's not exactly true to say that an IDE = text editor + much more.
> It's more about the nature of the features. A modern programmer's text
> editor such as Vim is an extremely powerful and flexible piece of
> software. I've just barely started to scratch the surface of what Vim
> can do and I learn something new virtually every time I use it.
> Although technically it can mean you have to do more typing than you
> would with an IDE, it also makes it a lot faster to type the text you
> put in.
>
> An IDE will roll everything you need into one package, including the
> compiler/interpreter, editor and debugger. A text editor does the text
> editing only, but in practice most of them allow you to access the
> command line from within the text editor (in Vim you just enter :!
> followed by the command you want to run), so you can use other tools
> from within the editor. I do most of my coding in Linux, so I would
> write a program in Vim, save it, then enter something like :!python
> example.py to run it.
>
> At the end of the day it's personal taste. I've tinkered with a few
> IDE's but I find text editors work better for me at the end of the
> day, and Vim in particular is one that really works well for me. It
> does depend on what you're doing. For larger projects sometimes a
> dedicated IDE is better, but most decent text editors can do a lot of
> the same things that an IDE can. It just requires a different
> approach.
>
> I'd recommend you check out this article:
> http://osteele.com/archives/2004/11/ides
> That gives a good insight into the whole IDE's vs text editors thing.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From marko.loparic at gmail.com  Sun Feb  1 10:13:36 2009
From: marko.loparic at gmail.com (markolopa)
Date: Sun, 1 Feb 2009 07:13:36 -0800 (PST)
Subject: python alternative to java rapid ajax platform (RAP)?
Message-ID: <226786ae-5e21-4b27-a7e6-7143f03ca1cb@r41g2000prr.googlegroups.com>

Hi,

Do you know a python alternative to rapid ajax platform (RAP)?

For the development of a user interface for mathematical models
someone suggested to use eclipse and that tool:

http://www.eclipse.org/rap/
http://www.eclipse.org/rap/about.php

If I understand correctly it allows you to design very easily a web
client interacting with your application (in particular you write no
javascript and qooxdoo is called for you). It seems to be to be a very
interesting package except that... it is in java. So I would like to
know if there is something similar using python.

Alternatively I would like to know if there is a way to use this tool
doing the minimum in java and the most in python (probably not).

Thanks!
Marko


From google at mrabarnett.plus.com  Sun Feb  1 10:27:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 01 Feb 2009 15:27:48 +0000
Subject: is python Object oriented??
In-Reply-To: <m2ljsq4vyq.fsf@valheru.db3l.homeip.net>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>	<4981985B.4070108@wildenhain.de>	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<m2ljsq4vyq.fsf@valheru.db3l.homeip.net>
Message-ID: <4985BF74.9030300@mrabarnett.plus.com>

David Bolen wrote:
> thmpsn.m.k at gmail.com writes:
> 
>> I don't know how you would do it in C# (or Java for that matter).
>>
>> In C++ you can play with pointers to "get at" some memory location
>> somewhere in the object. The only portable way to know the exact
>> location between the beginning of the object and the desired member is
>> the offsetof() macro, but as I understand it this only works for POD
>> types, which means that it won't work for classes such as:
>>
>> class NonPOD
>> {
>> private:
>>     int a;
>>     int b;
>> public:
>>     NonPOD();
>>     ~NonPOD();
>>     int C();
>> };
>>
>> (I haven't ever actually tried it, so I'm not sure.)
>>
>> Nevertheless, you can play and hope for the best. For example, if the
>> member you want to get at is 'b', then you can do:
>>
>> NonPOD obj;
>> std::cout << "obj.b = " << *(int*) ((unsigned char*) &obj + sizeof
>> (int)) << std::endl;
>>
>> and hope that the compiler didn't leave a hole between the 'a' member
>> and the 'b' member.
> 
> Probably moving off topic, but I don't think you have to get anywhere
> near that extreme in terms of pointers, unless you're trying to deal
> with instances for which you have no source but only opaque pointers.
> 
> I haven't gotten stuck having to do this myself yet, but I believe one
> commmon "hack" for the sort of class you show above is to just
> "#define private public" before including the header file containing
> the class definition.  No fiddling with pointers, offsets, or
> whatever, just normal object access syntax past that point.
> 
> Of course, I believe such a redefinition violates the letter of the
> C++ standard, but most preprocessors do it anyway.  Also, it won't
> handle the case where the "private:" is not used, but the members are
> just declared prior to any other definition, since a class is private
> by default.
> 
[snip]
You can also "#define class struct" before including the header file. 
The only difference between 'class' and 'struct' in C++ is that the 
members of a class are private by default and the members of a struct 
are public by default.


From cito at online.de  Sun Feb  1 10:33:51 2009
From: cito at online.de (Christoph Zwerschke)
Date: Sun, 01 Feb 2009 16:33:51 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
Message-ID: <gm4fcr$tr7$1@online.de>

It cost me a while to analyze the cause of the following problem.

The symptom was that testing a local web app with twill was fast
on Python 2.3, but very slow on Python 2.4-2.6 on a Win XP box.

This boiled down to the problem that if you run a SimpleHTTPServer
for localhost like this,

   BaseHTTPServer.HTTPServer(('localhost', 8000),
       SimpleHTTPServer.SimpleHTTPRequestHandler).serve_forever()

and access it using httplib.HTTPConnection on the same host like this

   httplib.HTTPConnection('localhost', 8000).connect()

then this call is fast using Py 2.3, but slow with Py 2.4-2.6.

I found that this was caused by a mismatch of the ip version used
by SimpleHTTPServer and HTTPConnection for a "localhost" argument.

What actually happens is the following:

* BaseHTTPServer binds only to the IPv4 address of localhost, because
   it's based on TCPServer which has address_family=AF_INET by default.

* HTTPConnection.connect() however tries to connect to all IP addresses
   of localhost, in the order determined socket.getaddrinfo('localhost').

   With Py 2.3 (without IPv6 support) this is only the IPv4 address,
   but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
   first, then the IPv4 address. Since the IPv6 address is checked first,
   this gives a timeout and causes the slow connect() call. The order by
   which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
   on the glibc version, so it may be a problem on other platforms, too.

You can see the cause of the slow connect() like this:

   import httplib
   conn = httplib.HTTPConnection('localhost', 8000)
   conn.set_debuglevel(1)
   conn.connect()

This is what I get:

   connect: (localhost, 8000)
   connect fail: ('localhost', 8000)
   connect: (localhost, 8000)

The first (failing) connect is the attempt to connect to the IPv6
address which BaseHTTPServer doesn't listen to. (This is the debug
output of Py 2.5 which really should be improved to show the IP address
that is actually used. Unfortunately, in Py 2.6 the debug output when
connecting has even fallen prey to a refactoring. I think it should
either be added again or set_debuglevel() is now pretty meaningless.)

Can we do something about the mismatch that SimpleHTTPServer only serves
IPv4, but HTTPConnection tries to connect with IPv6 first?

I guess other people also stumbled over this, maybe without even
noticing and just wondering about the slow performance. E.g.:
http://schotime.net/blog/index.php/2008/05/27/slow-tcpclient-connection-sockets/

One possible solution would be to improve the TCPServer in the standard
lib so that it determines the address_family and real server_address
based on the first return value of socket.getaddrinfo, like this:

class TCPServer(BaseServer):
     ...

     def __init__(self, server_address, RequestHandlerClass):
         if server_address and len(server_address) == 2:
             (self.address_family, dummy, dummy, dummy,
                 server_address) = socket.getaddrinfo(*server_address)[0]
         else:
             raise TypeError("server_address must be a 2-tuple")
         BaseServer.__init__(self, server_address, RequestHandlerClass)
         ...

That way, if you either serve as or connect to 'localhost', you will
always consistently do this via IPv4 or IPv6, depending on what is
preferred on your platform.

Does this sound reasonable? Any better ideas?

-- Christoph


From vedrandekovic at yahoo.com  Sun Feb  1 10:44:55 2009
From: vedrandekovic at yahoo.com (vedrandekovic at yahoo.com)
Date: Sun, 1 Feb 2009 07:44:55 -0800 (PST)
Subject: Python time measure question (timeit)
Message-ID: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>

Hello,

When I run following code with os.popen  (for this time measure I'm
using python module timeit):


for i in range(50):
    print i


I get this result:  0.00246958761519


But when I run same code from IDLE i get this result:
6.4533341528e-005


now, I have two questions:
              1) Which of this results is correct?
              2) Are this results in micro seconds?


Regards,
John


From kimwlias at gmail.com  Sun Feb  1 10:48:50 2009
From: kimwlias at gmail.com (kimwlias)
Date: Sun, 1 Feb 2009 07:48:50 -0800 (PST)
Subject: Problems installing PySQLite, SQLite and Trac
Message-ID: <1f1e74d1-f8b4-49e8-92d7-24c2354c8ca7@o40g2000prn.googlegroups.com>

My initial goal is to finally install Trac. This is the second day
I've been trying to make this possible but I can't find, for the life
of me, how to do this. OK, here is the story:

My system is a VPS with CentOS 5.

I found out that I have two versions of python: 2.4 at /usr/bin/
python2.4 and 2.5.2 at /usr/local/apps/python/bin/python2.5

My first try was to download the SQLite amalgamation, './configure',
'make' and 'make install'. Then I downloaded the PySQLite and 'python
setup.py install'. The funny part is that python2.4 has sqlite while
python2.5 doesn't:



    [root at xxx]# python
    Python 2.5.2 (r252:60911, May 10 2008, 17:42:40)
    [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] on linux2
    Type "help", "copyright", "credits" or "license" for more
information.
    >>> import sqlite
    Traceback (most recent call last):
    File "", line 1, in
    ImportError: No module named sqlite

    [root at xxx]# python2.4
    Python 2.4.3 (#1, Mar 14 2007, 18:51:08)
    [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
    Type "help", "copyright", "credits" or "license" for more
information.
    >>> import sqlite
    >>>

After some more research I found out that the amalgamation is not the
default way and I needed to run the extended_setup.py which isn't
inside the pysqlite! -> http://oss.itsystementwicklung.de/trac/pysqlite/wiki/PysqliteAmalgamation

I then thought, "OK, let's install the SQLite from the precompiled
binary packages". So I downloaded the first two packages from here:
http://www.sqlite.org/download.html . The one contains a .bin file and
the other an .so file. I must admit, I'm relatively new in Linux so I
don't know what do with these files. And there is NO DOCUMENTATION
what so ever on how to use these two in the SQLite website. Not even a
slight hint where to look for. The so called documentation is just a
download version of the website....

You can find some more information about my problem here:
http://stackoverflow.com/questions/500055/issues-installing-sqlite-pysqlite-trac-in-centos

I really really really need your help. Thank you so much in advance.


From berserker992 at gmail.com  Sun Feb  1 11:01:43 2009
From: berserker992 at gmail.com (berserker992 at gmail.com)
Date: Sun, 1 Feb 2009 08:01:43 -0800 (PST)
Subject: Problem With py2exe and ConfigParser
Message-ID: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>

Hello, i use python 2.6 + PyQt4.
I compile my main.pyw. It is compile, but don't run. In
"index.exe.log" error log:

>>>  File "index.pyw", line 100, in GetVal
>>>ConfigParser.NoSectionError: No section: 'Main'




>>>Code line 92 to 104 this is class that uses ConfigParser lib:
>>>class ConfigAcces:
>>>    def __init__(self):
>>>        self.cnf = ConfigParser()
>>>    def GetLibUrl(self):
>>>        self.cnf.read("config.ini")
>>>        return self.cnf.get("Main","lib_path")
>>>    def GetVal(self, p, key):
>>>        self.cnf.read("config.ini")
>>>        return self.cnf.get(p,key)
>>>    def SetVal(self, selection, option, NewVal):
>>>        self.cnf.read("config.ini")
>>>        self.cnf.set(selection,option,NewVal)
>>>        self.cnf.write(open("config.ini", "w"))



how do I fix this?


From grante at visi.com  Sun Feb  1 11:01:52 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 01 Feb 2009 10:01:52 -0600
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Address already in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
	<mailman.8520.1233493150.3487.python-list@python.org>
Message-ID: <QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d@posted.usinternet>

On 2009-02-01, Steve Holden <steve at holdenweb.com> wrote:

> I believe this is because Microsoft failed to understand the
> original meaning of ___________________, and persisted with
> this ghastly error in the name of backwards compatibility,
> justifying it by suggesting that _________________________.

Somebody should have cards printed up...

-- 
Grant



From steve at pearwood.info  Sun Feb  1 11:02:17 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Mon, 02 Feb 2009 03:02:17 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
	<0195625a$0$23675$c3e8da3@news.astraweb.com>
	<498596A0.6030005@jessikat.plus.net>
Message-ID: <0195bd97$0$14422$c3e8da3@news.astraweb.com>

Robin Becker wrote:

> Steven D'Aprano wrote:
>> Paul Rubin wrote:
>> 
>>> Steven D'Aprano <steve at pearwood.info> writes:
>>>> First question is, why do you care that it's slower? The difference
>>>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>>>> microsecond.
>>> That's a 71% speedup, pretty good if you ask me.
>> 
>> Don't you care that the code is demonstrably incorrect? The OP is
>> investigating options to use in Python 3, but the fastest method will
>> fail, because the "type is InstanceType" test will no longer work. (I
>> believe the fastest method, as given, is incorrect even in Python 2.x, as
>> it will accept ANY old-style class instead of just the relevant X or V
>> classes.)
> 
> I'm not clear why this is true? Not all instances will have the __X__
> attribute or has something else changed in Python3?

The func0() test doesn't look for __X__.


> The original code was intended to be called with only a subset of all
> class instances being passed as argument; as currently written it was
> unsafe because an instance of an arbitrary old class would pass into
> branch 1. Of course it will still be unsafe as arbitrary instances end
> up in branch 3
> 
> The intent is to firm up the set of cases being accepted in the first
> branch. The problem is that when all instances are new style then
> there's no easy check for the other acceptable arguments eg float,int,
> str etc, 

Of course there is.

isinstance(ob, (float, int)) 

is the easy, and correct, way to check if ob is a float or int.


> as I see it, the instances must be of a known class or have a 
> distinguishing attribute.

Are you sure you need to check for different types in the first place? Just
how polymorphic is your code, really? It's hard to judge because I don't
know what your code actually does.


> As for the timing, when I tried the effect of func1 on our unit tests I
> noticed that it slowed the whole test suite by 0.5%. 

An entire half a percent slower. Wow.

That's like one minute versus one minute and 0.3 second. Or one hour, versus
one hour and 18 seconds. I find it very difficult to get worked up over
such small differences. I think you're guilty of premature optimization:
wasting time and energy trying to speed up parts of the code that are
trivial. (Of course I could be wrong, but I doubt it.)



> Luckily func 3 
> style improved things by about 0.3% so that's what I'm going for.

I would call that the worst solution. Not only are you storing an attribute
which is completely redundant (instances already know what type they are,
you don't need to manually store a badge on them to mark them as an
instance of a class), but you're looking up this attribute only to
immediately throw away the value you get. The only excuse for this extra
redirection would be if it were significantly faster. But it isn't: you
said it yourself, 0.3% speed up. That's like 60 seconds versus 59.82
seconds.


-- 
Steven



From dchandran1 at tinkercell.com  Sun Feb  1 11:33:29 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Sun, 1 Feb 2009 08:33:29 -0800
Subject: Embedding numpy works once, but not twice??
In-Reply-To: <op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
	<op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <5dfe78f40902010833o14097535k379cca019c47316e@mail.gmail.com>

I sort of guessed that was the issue -- doing Py_Initialize/Py_Finalize more
than once. Thanks for the help.

On Sun, Feb 1, 2009 at 12:43 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Sun, 01 Feb 2009 03:47:27 -0200, Deepak Chandran <
> dchandran1 at tinkercell.com> escribi?:
>
>  I have a program in which I have successfully embedded Python. Now, I want
>> to include NumPy as well (and other modules). I am able to import numpy
>> once. Then I close the python console in my program and then re-open it.
>> When I try to import numpy for a second time, the program crashes. Below
>> is
>> a simple version of the problem.
>>
>
> The problem is not with NumPy. You can't run Py_Initialize/Py_Finalize more
> than once. Python doesn't have any mechanism to un-initialize loaded
> modules, and any static data that NumPy had initialized the first time it is
> imported becomes invalid the second time.
> Call Py_Initialize at the start of your program, and Py_Finalize at the
> end, never more than once.
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From deets at nospam.web.de  Sun Feb  1 11:39:29 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 01 Feb 2009 17:39:29 +0100
Subject: Problem With py2exe and ConfigParser
In-Reply-To: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
Message-ID: <6um1i1FfqskrU1@mid.uni-berlin.de>

berserker992 at gmail.com schrieb:
> Hello, i use python 2.6 + PyQt4.
> I compile my main.pyw. It is compile, but don't run. In
> "index.exe.log" error log:
> 
>>>>  File "index.pyw", line 100, in GetVal
>>>> ConfigParser.NoSectionError: No section: 'Main'
> 
> 
> 
> 
>>>> Code line 92 to 104 this is class that uses ConfigParser lib:
>>>> class ConfigAcces:
>>>>    def __init__(self):
>>>>        self.cnf = ConfigParser()
>>>>    def GetLibUrl(self):
>>>>        self.cnf.read("config.ini")
>>>>        return self.cnf.get("Main","lib_path")
>>>>    def GetVal(self, p, key):
>>>>        self.cnf.read("config.ini")
>>>>        return self.cnf.get(p,key)
>>>>    def SetVal(self, selection, option, NewVal):
>>>>        self.cnf.read("config.ini")
>>>>        self.cnf.set(selection,option,NewVal)
>>>>        self.cnf.write(open("config.ini", "w"))
> 
> 
> 
> how do I fix this?


By passing the right path for the configuration file? It's obviously not 
found.

Diez


From steve at holdenweb.com  Sun Feb  1 11:42:37 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 11:42:37 -0500
Subject: Python time measure question (timeit)
In-Reply-To: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
Message-ID: <gm4je0$93f$1@ger.gmane.org>

vedrandekovic at yahoo.com wrote:
> Hello,
> 
> When I run following code with os.popen  (for this time measure I'm
> using python module timeit):
> 
> 
> for i in range(50):
>     print i
> 
> 
> I get this result:  0.00246958761519
> 
> 
> But when I run same code from IDLE i get this result:
> 6.4533341528e-005
> 
> 
> now, I have two questions:
>               1) Which of this results is correct?

Both are. What makes you think that printing in IDLE (to a GUI) should
take the same amount of time as it does "running with os.popen (whatever
that means). The two environments are likely to be completely different,
but you haven't show the exact code you ran so it's hard to be more exact.

>               2) Are this results in micro seconds?
> 
No, seconds, as it says in the documentation:

"""This executes the setup statement once, and then returns the time it
takes to execute the main statement a number of times, measured in
seconds as a float""".

Even a modern computer doesn't do much in .0024 microseconds.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cd at okunah.de  Sun Feb  1 11:47:39 2009
From: cd at okunah.de (Christof Donat)
Date: Sun, 01 Feb 2009 17:47:39 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
Message-ID: <gm4jlo$u3v$1@svr7.m-online.net>

Hi,

>> IMHO, scripting languages like Python are generally better suited to
>> working with a text editor than an IDE.
>>   
> I don't understand that, because in my opinion yields
>   IDE = texteditor + (much) more
> please could you explain (as I'm very interested in user interfaces in
> general )

Try to think of the operating system as the IDE. At least with Unix and 
similar systems that is a really powerfull solution. It includes not only 
vim, bash and make, but also stuff like e.g. ctags, awk, sed, etc. Even 
python itsself is part of the system and can be used for special purpous 
utilities like e.g. code generators.

If you need User Interface Design, there are quite powerful stand alone 
tools, like e.g. the QtDesigner which can be used with that "OS IDE".

Christof




From thmpsn.m.k at gmail.com  Sun Feb  1 11:52:35 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Sun, 1 Feb 2009 08:52:35 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com> 
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com> 
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
Message-ID: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>

On Feb 1, 1:50?am, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Sat, 31 Jan 2009 15:28:14 -0800, thmpsn.m.k wrote:
> > On Jan 31, 2:27?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> Do you honestly believe that C++'s private members are really private?
> >> Privateness is only enforced during parsing time. Nobody can stop you
> >> from messing around with header files or memory. You can still access
> >> and modify private members but it's all messy and ugly. Even C# and
> >> .NET don't stop you from doing nasty things from unmananged assemblies.
>
> > I don't know how you would do it in C# (or Java for that matter).
>
> In Java you can use reflection to get your fingers on private fields.
>
> > In C++ you can play with pointers to "get at" some memory location
> > somewhere in the object.
> > [Snipped pointer fiddling explanation]
> > So: Sometimes it may work, usually it will be unsafe and/or non-
> > portable, and in most cases the procedure will look complicated.
>
> Or ``#define private public`` before including the header files. ?Which
> doesn't look complicated to me.

Which again won't always work, if:

(a) the header defines another macro, say, "PRIVATE", as "private",
and uses PRIVATE to declare private members
(b) the members are preceded with neither "private:" nor "public:" nor
"protected:", in which case they'll be private by default
(c) someone else suggested that point (b) is defeated by defining a
macro named "class" as "struct", which will make members public by
default; well, we can do something similar to what we did in point
(a): define a macro, say, "CLASS", as "class", and use CLASS the
define the class

Anyway, it doesn't matter. We're losing the point here. The point is
that language support for private access, by disallowing user access
to private data, provides an unambiguous information hiding mechanism
which encourages encapsulation. Python's approach, however, which is
only a naming convention rather than a language feature, merely TRUSTS
the programmer not to break encapsulation. And sure, if we're all good
programmers, everything will go well and we'll end up with an
organized application. But the danger is still there: at any given
time, we COULD break encapsulation!



From apt.shansen at gmail.com  Sun Feb  1 12:10:12 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 09:10:12 -0800 (PST)
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>

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From timmichelsen at gmx-topmail.de  Sun Feb  1 12:17:34 2009
From: timmichelsen at gmx-topmail.de (Tim Michelsen)
Date: Sun, 01 Feb 2009 18:17:34 +0100
Subject: Config files editor
Message-ID: <gm4lgh$fdv$1@ger.gmane.org>

Hello Python,
does anyone know of a Python based project that has a GUI based 
functionality to edit
config files read/written by ConfigParser?

I found a command line tool here:

pyinieditor - Google Code - http://code.google.com/p/pyinieditor/

But I'd rather go with a GUI tool.

Thanks in advance and kind regards,
Timmie



From kyrie at uh.cu  Sun Feb  1 12:23:57 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 01 Feb 2009 12:23:57 -0500
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <1233509037.4985daadd8b2a@mail.uh.cu>


Quoting thmpsn.m.k at gmail.com:

> > Or ``#define private public`` before including the header files. ?Which
> > doesn't look complicated to me.
> 
> Which again won't always work, if:
> 
> (a) the header defines another macro, say, "PRIVATE", as "private",
> and uses PRIVATE to declare private members

[other reasons deleted]

So, can I assume that most of the C++ code out there defines "PRIVATE" as
"private" just to prevent breaking the encapsulation _intentionally_? Somehow I
find that hard to believe.

> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation.

And Python, by providing a well defined convention of what is inaccessible,
provides an unambiguous information hiding mechanism wich encourages encapsulation.

> Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

And what's the problem with that, exactly? I can break encapsulation... and I
can jump off my roof. Why do _you_ care about what _I_ can do, as long as it
doesn't harm _you_ (or others)?

If you are worried about you breaking encapsulation, then just don't do it. It
is not hard. Whenever you find yourself typing "._somehting", just check that
the string before the dot is "self". If you can't trust yourself to access only
the well identified "public" attributes, how can you trust that you will just
not make "public" a private attribute anyway?

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From vicente.soler at gmail.com  Sun Feb  1 12:24:37 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 09:24:37 -0800 (PST)
Subject: getting values from a text file (newby)
Message-ID: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>

Hi,

My foo.txt file contains the following:

1,"house","2,5"
2,"table","6,7"
3,"chair","-4,5"

... as seen with notepad.

This file was created with the OpenOffice Calc spreadsheet, but since
I use comma as the decimal separator for numbers, the last value in
each line appears sorrounded by quotes.

I would like to obtain:

[[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]

in order to process the content of the file. However, so far, I have
not obtained the desired result.

I started testing with (only for first line):

f=open('foo.txt','r')
t=f.readline()
print t
t=t.split(',')
print t
f.close()

But what I am getting is far more complex than what I expected:

1,"house","2,5"

['1', '"house"', '"2', '5"\n']

which is unprocessable.

Can anyboby help?


From steve at holdenweb.com  Sun Feb  1 12:31:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 12:31:27 -0500
Subject: is python Object oriented??
In-Reply-To: <fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <4985DC6F.4030106@holdenweb.com>

Stephen Hansen wrote:
> [...]
> don't play with anyone else's
> privates.
> 
A good rule in life as well as programming.

> The *idea* of encapsulation is good in many cases, it is quite often a
> solid design point and admirable goal. The *implementation* of enforced
> data encapsulation brings no value to any realistic situation.
> 
I think it's noticeable that the people who have been arguing against
what I might tipify as this "libertarian view" are those for whom the
consequences of programming error are serious to extreme.

I think we might have to accept that they are never going to be
comfortable with Python as it's currently constituted, whether or not we
suggest that discipline might replace enforcement.

Just the same, it still doesn't save them from the consequences of
interface miscommunication, as int he case of the Mars lander that
crashed because one module provided a (probably strongly-typed) value in
meters, and the recipient interpreted it as (probably strongly-typed)
feet, cutting the engine out too early.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From vedrandekovic at yahoo.com  Sun Feb  1 12:32:05 2009
From: vedrandekovic at yahoo.com (vedrandekovic at yahoo.com)
Date: Sun, 1 Feb 2009 09:32:05 -0800 (PST)
Subject: Python time measure question (timeit)
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
	<mailman.8528.1233506575.3487.python-list@python.org>
Message-ID: <7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>

On 1 velj, 17:42, Steve Holden <st... at holdenweb.com> wrote:
> vedrandeko... at yahoo.com wrote:
> > Hello,
>
> > When I run following code with os.popen ?(for this time measure I'm
> > using python module timeit):
>
> > for i in range(50):
> > ? ? print i
>
> > I get this result: ?0.00246958761519
>
> > But when I run same code from IDLE i get this result:
> > 6.4533341528e-005
>
> > now, I have two questions:
> > ? ? ? ? ? ? ? 1) Which of this results is correct?
>
> Both are. What makes you think that printing in IDLE (to a GUI) should
> take the same amount of time as it does "running with os.popen (whatever
> that means). The two environments are likely to be completely different,
> but you haven't show the exact code you ran so it's hard to be more exact.
>
> > ? ? ? ? ? ? ? 2) Are this results in micro seconds?
>
> No, seconds, as it says in the documentation:
>
> """This executes the setup statement once, and then returns the time it
> takes to execute the main statement a number of times, measured in
> seconds as a float""".
>
> Even a modern computer doesn't do much in .0024 microseconds.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Hello again,

This is the code that I ran:

a) Main code:

This code is in .exe:

  t = Timer("import os;os.popen('python myscript.py arg1 2 3')")
  print t.timeit()


b) myscript.py code:

    import sys
    print sys.argv[1]
    var1=int(sys.argv[2])
    var2=int(sys.argv[3])
    var3=var1+var2


Regards,
John






From rt8396 at gmail.com  Sun Feb  1 12:41:21 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 09:41:21 -0800 (PST)
Subject: getting values from a text file (newby)
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
Message-ID: <2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>


Try the csv module

py> import csv
py> reader = csv.reader(open(csvfile, "rb"))
py> for row in reader:
	print row


['1', 'house', '2,5 ']
['2', 'table', '6,7 ']
['3', 'chair', '-4,5 ']


From steve at holdenweb.com  Sun Feb  1 12:50:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 12:50:55 -0500
Subject: getting values from a text file (newby)
In-Reply-To: <2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>
Message-ID: <gm4ne1$krb$1@ger.gmane.org>

r wrote:
> Try the csv module
> 
> py> import csv
> py> reader = csv.reader(open(csvfile, "rb"))
> py> for row in reader:
> 	print row
> 
> 
> ['1', 'house', '2,5 ']
> ['2', 'table', '6,7 ']
> ['3', 'chair', '-4,5 ']

And then, to conert the last field to numbers? ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From joncle at googlemail.com  Sun Feb  1 12:51:57 2009
From: joncle at googlemail.com (Jon Clements)
Date: Sun, 1 Feb 2009 09:51:57 -0800 (PST)
Subject: Problems installing PySQLite, SQLite and Trac
References: <1f1e74d1-f8b4-49e8-92d7-24c2354c8ca7@o40g2000prn.googlegroups.com>
Message-ID: <92ec1676-7c46-4cb5-beee-da25502ddd15@s1g2000prg.googlegroups.com>

On 1 Feb, 15:48, kimwlias <kimwl... at gmail.com> wrote:
> My initial goal is to finally install Trac. This is the second day
> I've been trying to make this possible but I can't find, for the life
> of me, how to do this. OK, here is the story:
>
> My system is a VPS with CentOS 5.
>
> I found out that I have two versions of python: 2.4 at /usr/bin/
> python2.4 and 2.5.2 at /usr/local/apps/python/bin/python2.5
>
> My first try was to download the SQLite amalgamation, './configure',
> 'make' and 'make install'. Then I downloaded the PySQLite and 'python
> setup.py install'. The funny part is that python2.4 has sqlite while
> python2.5 doesn't:
>
> ? ? [root at xxx]# python
> ? ? Python 2.5.2 (r252:60911, May 10 2008, 17:42:40)
> ? ? [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more
> information.
> ? ? >>> import sqlite
> ? ? Traceback (most recent call last):
> ? ? File "", line 1, in
> ? ? ImportError: No module named sqlite
>
> ? ? [root at xxx]# python2.4
> ? ? Python 2.4.3 (#1, Mar 14 2007, 18:51:08)
> ? ? [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more
> information.
> ? ? >>> import sqlite
> ? ? >>>
>
> After some more research I found out that the amalgamation is not the
> default way and I needed to run the extended_setup.py which isn't
> inside the pysqlite! ->http://oss.itsystementwicklung.de/trac/pysqlite/wiki/PysqliteAmalgama...
>
> I then thought, "OK, let's install the SQLite from the precompiled
> binary packages". So I downloaded the first two packages from here:http://www.sqlite.org/download.html. The one contains a .bin file and
> the other an .so file. I must admit, I'm relatively new in Linux so I
> don't know what do with these files. And there is NO DOCUMENTATION
> what so ever on how to use these two in the SQLite website. Not even a
> slight hint where to look for. The so called documentation is just a
> download version of the website....
>
> You can find some more information about my problem here:http://stackoverflow.com/questions/500055/issues-installing-sqlite-py...
>
> I really really really need your help. Thank you so much in advance.

IIRC, pysqlite was a wrapper for the SQLite library. However, in
version 2.5+ of Python, it's part of the standard distribution and is
in the module called sqlite3. Just walking throuh the instructions
(although I only have 2.5.2 installed gives me this):

Python 2.5.2 (r252:60911, Oct  5 2008, 19:24:49)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
>>> import pysqlite2


Are you trying to set up using 2.4 or 2.5? I'm just a little confused
as to why if sqlite works on 2.4 which looking at the installation
instruction [ref: http://www.installationwiki.org/Installing_Trac_and_Subversion#Python]
is what's recommended, is what the problem is?

As you're under a redhat derivative, perhaps it might be worth just
getting the rpm(s) for pysqlite2 and that might well sort it out for
you.

Sorry to have not been of more help,

Jon.



From rt8396 at gmail.com  Sun Feb  1 12:59:29 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 09:59:29 -0800 (PST)
Subject: getting values from a text file (newby)
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com> 
	<mailman.8533.1233510679.3487.python-list@python.org>
Message-ID: <a71f9db8-201c-436d-b137-303a6587b422@s9g2000prg.googlegroups.com>

On Feb 1, 11:50?am, Steve Holden <st... at holdenweb.com> wrote:
> And then, to conert the last field to numbers? ...

Are you asking me Steve? Well i did not want to short-circuit the OP's
learning process by spoon-feeding him the entire answer. I thought i
would give him a push in the right direction and observe the outcome.

A very intelligent professor once said:
""" It's not about giving a student all the info, only just enough to
spark their own thought process."""




From apt.shansen at gmail.com  Sun Feb  1 13:02:37 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 10:02:37 -0800 (PST)
Subject: getting values from a text file (newby)
In-Reply-To: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
Message-ID: <fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>

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From steve at holdenweb.com  Sun Feb  1 13:05:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 13:05:11 -0500
Subject: Python time measure question (timeit)
In-Reply-To: <7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>	<mailman.8528.1233506575.3487.python-list@python.org>
	<7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>
Message-ID: <gm4o8p$neu$1@ger.gmane.org>

vedrandekovic at yahoo.com wrote:
> On 1 velj, 17:42, Steve Holden <st... at holdenweb.com> wrote:
>> vedrandeko... at yahoo.com wrote:
>>> Hello,
>>> When I run following code with os.popen  (for this time measure I'm
>>> using python module timeit):
>>> for i in range(50):
>>>     print i
>>> I get this result:  0.00246958761519
>>> But when I run same code from IDLE i get this result:
>>> 6.4533341528e-005
>>> now, I have two questions:
>>>               1) Which of this results is correct?
>> Both are. What makes you think that printing in IDLE (to a GUI) should
>> take the same amount of time as it does "running with os.popen (whatever
>> that means). The two environments are likely to be completely different,
>> but you haven't show the exact code you ran so it's hard to be more exact.
>>
>>>               2) Are this results in micro seconds?
>> No, seconds, as it says in the documentation:
>>
>> """This executes the setup statement once, and then returns the time it
>> takes to execute the main statement a number of times, measured in
>> seconds as a float""".
>>
>> Even a modern computer doesn't do much in .0024 microseconds.
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Hello again,
> 
> This is the code that I ran:
> 
> a) Main code:
> 
> This code is in .exe:
> 
>   t = Timer("import os;os.popen('python myscript.py arg1 2 3')")
>   print t.timeit()
> 
Here in order to run the code os.popen() has to create a new subprocess
and initialize the Python interpreter inside it before finally running
myscript.py. I'd say that 2.5 milliseconds is quite acceptable for that.
> 
> b) myscript.py code:
> 
>     import sys
>     print sys.argv[1]
>     var1=int(sys.argv[2])
>     var2=int(sys.argv[3])
>     var3=var1+var2
> 
In the IDLE case I presume you were running the code directly? Obviously
that eliminates the interpreter startup overhead, and so will be much
quicker. 65 microseconds, if I read the times correctly.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gbofspam at gmail.com  Sun Feb  1 13:46:56 2009
From: gbofspam at gmail.com (Andrew Parker)
Date: Sun, 1 Feb 2009 13:46:56 -0500
Subject: subprocess.Popen not creating a pipe
Message-ID: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>

I'm having some fun with Popen.  I have the following line:

    process = subprocess.Popen(command, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
    print process.stdout

Under normal circumstances, this displays:

    <open file '<stdout>', mode 'w' at 0xb7f8e068>

However, I have a binary that I use to kick off this script, and when
that runs, it displays:

    None

So, two questions:

    1.  What the heck is this binary doing that upsets Popen so much?
    2.  What can *my script* do to get around this problem.

Unfortunately I'm stuck using this binary, so its the python where I
have to solve this.

Any ideas?


From rantingrick at gmail.com  Sun Feb  1 13:57:28 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 1 Feb 2009 10:57:28 -0800 (PST)
Subject: Pipe stdout && stderr to a TkLabel widget
References: <3022e071-aaf9-4169-b394-c8b311d05d09@41g2000yqf.googlegroups.com>
	<b23be880-de2b-4f95-8f4f-9fa85b8fd057@h20g2000yqn.googlegroups.com>
Message-ID: <bc163bd7-bd2c-4a20-8e91-dbe3475116df@e24g2000vbe.googlegroups.com>

Hello, anybody. Any help would be good help

Thanks


From aahz at pythoncraft.com  Sun Feb  1 13:57:56 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 10:57:56 -0800
Subject: Pythonic list/tuple/dict layout?
References: <mailman.7952.1232871512.3487.python-list@python.org>
	<871vur39k7.fsf@benfinney.id.au>
Message-ID: <gm4rbk$gp9$1@panix3.panix.com>

In article <871vur39k7.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>
>I actually use this style:
>
>    foo = {
>        0: 'spam',
>        1: 'eggs',
>        2: 'beans',
>        }
>
>because that makes it clear that *all* the indented lines are a
>continuation of the same statement, just like a suite of statements
>are all uniformly indented under (e.g.) a function definition.

Ditto
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From rantingrick at gmail.com  Sun Feb  1 14:00:40 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 1 Feb 2009 11:00:40 -0800 (PST)
Subject: Pipe stdout && stderr to a TkLabel widget
References: <3022e071-aaf9-4169-b394-c8b311d05d09@41g2000yqf.googlegroups.com>
	<b23be880-de2b-4f95-8f4f-9fa85b8fd057@h20g2000yqn.googlegroups.com> 
	<bc163bd7-bd2c-4a20-8e91-dbe3475116df@e24g2000vbe.googlegroups.com>
Message-ID: <f2ee7867-8cc7-484f-9a3c-579b619b0e56@d36g2000prf.googlegroups.com>

PS:

The braces are there because i used *arg in the fuction, so that is
not a problem now. All i want to do is overide the print statement to
sent all it's output to a Tkinter Label widget

Thanks


From rdmurray at bitdance.com  Sun Feb  1 14:02:57 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 19:02:57 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <gm4rl1$21r$1@ger.gmane.org>

Quoth thmpsn.m.k at gmail.com:
> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

You, sir, should be programming in some language other than Python.

--RDM



From berankin99 at yahoo.com  Sun Feb  1 14:06:26 2009
From: berankin99 at yahoo.com (Bernard Rankin)
Date: Sun, 1 Feb 2009 11:06:26 -0800 (PST)
Subject: error on building 2.6.1. (_ctypes)
References: <852876.9144.qm@web112210.mail.gq1.yahoo.com>
	<op.uojy1o1gx6zn5v@gabriel2.softlabbsas.com.ar>
	<296542.92832.qm@web112216.mail.gq1.yahoo.com>
	<op.uolzwepsx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <808820.1690.qm@web112216.mail.gq1.yahoo.com>




> 
> >> > I am trying to build python 2.6 on a machine (web server) that I do not 
> have
> >> root access to. (has 2.4 installed)
> >> >
> >> > Python 2.5 builds fine, but I am getting an error when I run "make" for 
> 2.6.1.
> 
> >> Mmm... my 2.6.1 source show different line numbers, maybe you should check 
> it's
> >> the right file?
> > 
> > Wow, good catch.
> > 
> > I just re-downloaded the archive and it works fine.
> > 
> > I know for certain that I did no editing to the files, and even tried 
> expanding the original tar.gz a couple of times.
> > 
> > There must be a corrupted package somewhere among the official Python 
> mirrors.  (Sadly, I overwrote the old tar.gz file when I got the new one.)
> 
> Oops... so bad. The python.org releases have PGP signatures and MD5 published so 
> you can verify their authenticity.
> 

Yeah, I did that on the new archive. :)


      



From ppearson at nowhere.invalid  Sun Feb  1 14:11:39 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 1 Feb 2009 19:11:39 GMT
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <6umafaFg436kU1@mid.individual.net>

On Sun, 1 Feb 2009 15:36:43 +1000, Tim Roberts <t.roberts at cqu.edu.au> wrote:
>
> Actually, all I'm interested in is whether the 100 digit
> numbers have an exact integral root, or not.  At the
> moment, because of accuracy concerns, I'm doing something
> like
>  
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

You've gotten several promising leads on this thread, but
here's one more thing that might help.  Note that if 
c == b**13, then c%p == pow( b%p, 13, p ) for any prime p.
So if you have a 100-digit c and a "candidate" 13-th root b,
and you choose p = 101 (for example), a false b has only a 1%
chance of passing the c%p == pow( b%p, 13, p ) test, which
might save some fraction of the cost of whatever more
rigorous test you subsequently apply.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From vicente.soler at gmail.com  Sun Feb  1 14:18:01 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 11:18:01 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org>
Message-ID: <e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com>

On 1 feb, 19:02, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Sun, Feb 1, 2009 at 9:24 AM, vsoler<vicente.soler at gmail.com>wrote:Hi,
> My foo.txt file contains the following:
> 1,"house","2,5"
> 2,"table","6,7"
> 3,"chair","-4,5"
> ... as seen with notepad.
> This file was created with the OpenOffice Calc spreadsheet, but since
> I use comma as the decimal separator for numbers, the last value in
> each line appears sorrounded by quotes.
> I would like to obtain:
> [[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]
> If I read your requirements, right, I think you want:import csv
> data = []
> reader = csv.reader(open("filename", "r"))
> for line in reader:
> ???? data.append(
> ???????? line[0], line[1], float(line[2].replace(",", "."))
> ???? )
> print data
> Although you may want to replace that last bit with
> ??? decimal.Decimal(line[2].replace(",","."))
> If you want an exact result and not the approximate floating point result.
> Basically the csv module can read through the CSV file very easily, but because you're using commas instead of points you just have to edit that out before you convert it to a number.
> --S
>
> ?signature.asc
> < 1 KBVerDescargar

with small modifications, your answers work perfectly!!!

r: in the open statement, why do you use 'rb' as 2nd argument? b is
supposed to be binary, and my file is text!
Steve: your idea works
Stephen: I got an error message saying that append can only take one
argument while you add three; I have added [ ] around the three
arguments; now it's fine; I've also added int() around first argument
to turn it into an integer.

Thank you all indeed!


From aaron.watters at gmail.com  Sun Feb  1 14:18:14 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Sun, 1 Feb 2009 11:18:14 -0800 (PST)
Subject: search speed
References: <4e53a2a6-058f-4265-a4d6-5565e2fec2c3@v39g2000pro.googlegroups.com>
	<6uft9aFf9kgbU1@mid.uni-berlin.de>
Message-ID: <8a972421-cba3-4394-8651-c81fce1083da@i18g2000prf.googlegroups.com>

On Jan 30, 3:49?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> alex23 gave you a set of tools that you can use for full-text-search.
> However, that's not necessarily the best thing to do if things have a
> record-like structure.

In Nucular (and others I think) you can do searches
for terms anywhere (full text)
searches for terms within fields, searches for prefixes in fields,
searches
based on field inequality, or searches for field exact value.  I would
argue this subsumes the standard "fielded approach".
   -- Aaron Watters
===
Oh, I'm a lumberjack and I'm O.K...



From steve at holdenweb.com  Sun Feb  1 14:19:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 14:19:55 -0500
Subject: getting values from a text file (newby)
In-Reply-To: <fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm4skr$5do$1@ger.gmane.org>

Stephen Hansen wrote:
> 
> 
> On Sun, Feb 1, 2009 at 9:24 AM, vsoler <vicente.soler at gmail.com> wrote:
> 
>     Hi,
> 
>     My foo.txt file contains the following:
> 
>     1,"house","2,5"
>     2,"table","6,7"
>     3,"chair","-4,5"
> 
>     ... as seen with notepad.
> 
>     This file was created with the OpenOffice Calc spreadsheet, but since
>     I use comma as the decimal separator for numbers, the last value in
>     each line appears sorrounded by quotes.
> 
>     I would like to obtain:
> 
>     [[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]
> 
> 
> If I read your requirements, right, I think you want:
> 
> import csv
> 
> data = []
> 
> reader = csv.reader(open("filename", "r"))
> for line in reader:
>      data.append(
>          line[0], line[1], float(line[2].replace(",", "."))
>      )
> 
> print data
> 
> Although you may want to replace that last bit with
>     decimal.Decimal(line[2].replace(",","."))
> 
> If you want an exact result and not the approximate floating point result.
> 
> Basically the csv module can read through the CSV file very easily, but
> because you're using commas instead of points you just have to edit that
> out before you convert it to a number.
> 
alternatively look at locale.atof() to convert according to what I
presume are the conventions of your locale ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Sun Feb  1 14:33:28 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 19:33:28 +0000 (UTC)
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
References: <gm4fcr$tr7$1@online.de>
Message-ID: <gm4te8$79g$1@ger.gmane.org>

Quoth Christoph Zwerschke <cito at online.de>:
> What actually happens is the following:
> 
> * BaseHTTPServer binds only to the IPv4 address of localhost, because
>    it's based on TCPServer which has address_family=AF_INET by default.
> 
> * HTTPConnection.connect() however tries to connect to all IP addresses
>    of localhost, in the order determined socket.getaddrinfo('localhost').
> 
>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>    first, then the IPv4 address. Since the IPv6 address is checked first,
>    this gives a timeout and causes the slow connect() call. The order by
>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>    on the glibc version, so it may be a problem on other platforms, too.

Based on something I read in another thread, this appears to be a problem
only under Windows.  Everybody else implemented the TCP/IP stack according
to spec, and the IPV6 connect attempt times out immediately, producing
no slowdown.

Microsoft, however....

--RDM



From matt.dubins at sympatico.ca  Sun Feb  1 14:54:09 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Sun, 1 Feb 2009 11:54:09 -0800 (PST)
Subject: Membership of multiple items to a list
Message-ID: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>

Dear all,

I'd like to know how to elegantly check a list for the membership of
any of its items to another list.  Not caring for elegance, I would
use the following code:

blah = [1,2,3]
yadda = [3,4,5,6]

blah[0] or blah[1] or blah[2] in yadda

Please tell me how to change the preceding code into something nicer
where I don't have to keep extending the line based on the length of
the first list.

Cheers,
Matt Dubins


From gbofspam at gmail.com  Sun Feb  1 15:00:36 2009
From: gbofspam at gmail.com (Andrew Parker)
Date: Sun, 1 Feb 2009 15:00:36 -0500
Subject: subprocess.Popen not creating a pipe
In-Reply-To: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
References: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
Message-ID: <6c3f5e6c0902011200s47372b8g49c794b7fa62a06b@mail.gmail.com>

On Sun, Feb 1, 2009 at 1:46 PM, Andrew Parker <gbofspam at gmail.com> wrote:
> I'm having some fun with Popen.  I have the following line:
>
>    process = subprocess.Popen(command, stdout=subprocess.PIPE,
> stderr=subprocess.STDOUT)
>    print process.stdout
>
> Under normal circumstances, this displays:
>
>    <open file '<stdout>', mode 'w' at 0xb7f8e068>
>
> However, I have a binary that I use to kick off this script, and when
> that runs, it displays:
>
>    None
>
> So, two questions:
>
>    1.  What the heck is this binary doing that upsets Popen so much?
>    2.  What can *my script* do to get around this problem.
>
> Unfortunately I'm stuck using this binary, so its the python where I
> have to solve this.
>
> Any ideas?
>

so, tracing through subprocess.Popen, I see that os.pipe() is being
invoked for stdout.  This is returning (0, 3), and I assume the 0 is
conflicting with what python is assuming is stdin.  Calling pipe()
before Popen gets around my problem, as the pipe the Popen gets then
returns (4,5) which Popen seems happy with.

Sounds like a bug.  Should I report this, or is it expected/known behaviour?


From http  Sun Feb  1 15:00:51 2009
From: http (Paul Rubin)
Date: 01 Feb 2009 12:00:51 -0800
Subject: Membership of multiple items to a list
References: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <7x63junczw.fsf@ruckus.brouhaha.com>

inkhorn <matt.dubins at sympatico.ca> writes:
> blah = [1,2,3]
> yadda = [3,4,5,6]
> 
> blah[0] or blah[1] or blah[2] in yadda

if set(blah) & set(yadda): print "yes"


From lists at cheimes.de  Sun Feb  1 15:00:55 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 01 Feb 2009 21:00:55 +0100
Subject: Membership of multiple items to a list
In-Reply-To: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
References: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <gm4v1m$bt4$1@ger.gmane.org>

inkhorn schrieb:
> Dear all,
> 
> I'd like to know how to elegantly check a list for the membership of
> any of its items to another list.  Not caring for elegance, I would
> use the following code:
> 
> blah = [1,2,3]
> yadda = [3,4,5,6]
> 
> blah[0] or blah[1] or blah[2] in yadda
> 
> Please tell me how to change the preceding code into something nicer
> where I don't have to keep extending the line based on the length of
> the first list.

You can and should use Python's set type for membership testing.

>>> blah = set([1,2,3])
>>> yadda = set([3,4,5,6])
>>> blah.issubset(yadda)
False
>>> blah.difference(yadda)
set([1, 2])
>>> blah.symmetric_difference(yadda)
set([1, 2, 4, 5, 6])

Christian



From apt.shansen at gmail.com  Sun Feb  1 15:01:11 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 12:01:11 -0800 (PST)
Subject: Membership of multiple items to a list
In-Reply-To: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <fqo51sdyacxjjl9locUYAxe124vaj_firegpg@mail.gmail.com>

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From matt.dubins at sympatico.ca  Sun Feb  1 15:06:54 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Sun, 1 Feb 2009 12:06:54 -0800 (PST)
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
Message-ID: <a685967a-db1c-447e-bce2-37f2d562659d@v5g2000pre.googlegroups.com>

Wow thanks for the lightning fast reply!  This does exactly the right
job.

Matt

On Feb 1, 3:01?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> I'd like to know how to elegantly check a list for the membership of
> any of its items to another list. ?Not caring for elegance, I would
> use the following code:
> That's one of the useful properties of sets:
> >>> a = [1,2,3]
> >>> b = [3,4,5,6]
> >>> set(a) & set(b)
> set([3])
> >>> set(a).intersection(b)
> set([3])
> That's two spellings of the same thing. As for testing: an empty set like an empty list will return false, so "if set(a) & set(b):" will be true or false based on if there's any commonalities between the two lists.
> --Stephen
>
> ?signature.asc
> < 1KViewDownload



From ianand0204 at gmail.com  Sun Feb  1 15:35:47 2009
From: ianand0204 at gmail.com (flagg)
Date: Sun, 1 Feb 2009 12:35:47 -0800 (PST)
Subject: SimpleXMLRPCServer question
References: <0ddb9364-02c9-4c52-aadb-e9d9b2d06b20@e1g2000pra.googlegroups.com><mailman.8423.1233375172.3487.python-list@python.org>
	<185b44c2-fc78-480f-8eb1-6395f7fe7ad7@x6g2000pre.googlegroups.com> 
	<mailman.8514.1233479578.3487.python-list@python.org>
Message-ID: <542076e8-2585-4be1-a553-43dc674e02a4@a12g2000pro.googlegroups.com>

On Feb 1, 12:38?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> ?"flagg" <iana..... at gmail.com> wrote:
> >Let me see if i can elaborate on the requirements. ?I have 20+
> >different zone files. ?I want the xmlrpc server to be able to
> >determine what zone file to open by looking at the incoming xml
> >request. ?For example one of the functions I have now is to show a DNS
> >record (I am using dnspython for most of this work)
>
> This is a wrong move, it is too magical - see below
>
> >If i send an xmlrpc request that uses the 'showRecord' function with
> >params of 'oracle1.foo.bar.com' ?I want to parse the "params" piece
> >and then instruct the xml-rpc server to open foo.bar.com.zone for
> >reading. ?The reason why i was looking at do_Post() and _dispatch was
> >to attempt to read the incoming params and do exactly that.
>
> >Do you think there is an easier way of accomplishing this, than the
> >way I am going about it?
>
> Yes I do.
>
> Why don't you split the functionality into two bits - exactly as if you were
> doing
> it locally:
>
> - OpenTheThing(whatOrWhere)
> - ReadTheRecordAndShowIt(PossiblyWhichRecord)
>
> If it's a remote database you are accessing, then you may need even more
> steps, like first doing some select, or whatever - I would get it running
> locally, calling local functions directly on the server, and then make them
> remote xmlrpc proxy functions, after it's all working.
>
> If you are getting the request from some user input, you can either change
> the way you ask the questions, or you do the parsing at point of origen, to
> determine what to call, in which sequence.
>
> - Hendrik

Actually I have it working as local functions, its wrapping those
local functions up in a way that makes sense that is throwing me off.
Your suggestion of making two functions one for opening the file and
one for showing records makes sense.   I will give it a shot


From mensanator at aol.com  Sun Feb  1 16:04:02 2009
From: mensanator at aol.com (Mensanator)
Date: Sun, 1 Feb 2009 13:04:02 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
Message-ID: <44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com>

On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
> On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > which is probably very inefficient, but I can't see anything better.....
>
> > Tim
>
> Take a look at gmpy and the is_power function. I think it will do
> exactly what you want.

And the root function will give you the root AND tell you whether
it was an integral root:

>>> gmpy.root(a,13)
(mpz(3221), 0)

In this case, it wasn't.

>
> http://code.google.com/p/gmpy/
>
> casevh



From cito at online.de  Sun Feb  1 17:44:11 2009
From: cito at online.de (Christoph Zwerschke)
Date: Sun, 01 Feb 2009 23:44:11 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <mailman.8540.1233516823.3487.python-list@python.org>
References: <gm4fcr$tr7$1@online.de>
	<mailman.8540.1233516823.3487.python-list@python.org>
Message-ID: <gm58jn$nu3$1@online.de>

rdmurray at bitdance.com schrieb:
> Quoth Christoph Zwerschke <cito at online.de>:
>>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>>    first, then the IPv4 address. Since the IPv6 address is checked first,
>>    this gives a timeout and causes the slow connect() call. The order by
>>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>>    on the glibc version, so it may be a problem on other platforms, too.
> 
> Based on something I read in another thread, this appears to be a problem
> only under Windows.  Everybody else implemented the TCP/IP stack according
> to spec, and the IPV6 connect attempt times out immediately, producing
> no slowdown.
> 
> Microsoft, however....

The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
returns IPv6 addresses first is not wrong in itself.

For this discussion, see also
http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
https://bugzilla.redhat.com/show_bug.cgi?id=190495

But yes, I also wonder why the connect to the IPv6 loopback address does 
not time out more quickly on Windows.

-- Christoph


From stef.mientki at gmail.com  Sun Feb  1 17:56:28 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 23:56:28 +0100
Subject: database wrapper ?
Message-ID: <4986289C.3030205@gmail.com>

hello,

Until now I used a simple wrapper around pysqlite and pyodbc to manage 
my databases.
Now I'm looking for a better solution,
because I've to support a (for this moment) unknown database,
and I'm not the one who will choose the database.

Googling, I found SQLalchemy,
which looks quit good.

But as I only want to choose once,
I googled for  "SQLalchemy alternatives",
but it didn't find many answers.
(Storm / Grok are of no interest, because manipulating the structure of 
the database is a key issue).

Is SQLalchemy the best / most popular database wrapper ?
Are there any alternatives ?

I don't know if it matters:
but for the short term it's only for desktop applications,
but in the future I'll certainly want to move to web based databases.

thanks,
Stef



From sjmachin at lexicon.net  Sun Feb  1 17:57:39 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 14:57:39 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com>
Message-ID: <e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com>

On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
> r: in the open statement, why do you use 'rb' as 2nd argument? b is
> supposed to be binary, and my file is text!

Because unlike Stephen, r has read the csv manual. Binary mode is
required to handle properly cases like '\n' embedded in a field --
something which can easily happen when the data has been extracted
from a database with slack data-entry validation.


From vicente.soler at gmail.com  Sun Feb  1 18:18:50 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 15:18:50 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com> 
	<e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com>
Message-ID: <fe74d94e-c100-4e45-a6f8-88d886f32ccc@r10g2000prf.googlegroups.com>

On 1 feb, 23:57, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
>
>
> > r: in the open statement, why do you use 'rb' as 2nd argument? b is
> > supposed to be binary, and my file is text!
>
> Because unlike Stephen, r has read the csv manual. Binary mode is
> required to handle properly cases like '\n' embedded in a field --
> something which can easily happen when the data has been extracted
> from a database with slack data-entry validation.

Where can I get the csv manual?


From rdmurray at bitdance.com  Sun Feb  1 18:26:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 23:26:07 +0000 (UTC)
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
References: <gm4fcr$tr7$1@online.de>
	<mailman.8540.1233516823.3487.python-list@python.org>
	<gm58jn$nu3$1@online.de>
Message-ID: <gm5b2f$dcp$1@ger.gmane.org>

Quoth Christoph Zwerschke <cito at online.de>:
> rdmurray at bitdance.com schrieb:
> > Quoth Christoph Zwerschke <cito at online.de>:
> >>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
> >>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
> >>    first, then the IPv4 address. Since the IPv6 address is checked first,
> >>    this gives a timeout and causes the slow connect() call. The order by
> >>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
> >>    on the glibc version, so it may be a problem on other platforms, too.
> > 
> > Based on something I read in another thread, this appears to be a problem
> > only under Windows.  Everybody else implemented the TCP/IP stack according
> > to spec, and the IPV6 connect attempt times out immediately, producing
> > no slowdown.
> > 
> > Microsoft, however....
> 
> The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
> written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
> returns IPv6 addresses first is not wrong in itself.
> 
> For this discussion, see also
> http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
> https://bugzilla.redhat.com/show_bug.cgi?id=190495
> 
> But yes, I also wonder why the connect to the IPv6 loopback address does 
> not time out more quickly on Windows.

Right, it's not the order of the returned items that's the Microsoft
weirdness, it's the long timeout on an attempt to connect to something
that doesn't exist.  There was a long discussion about this, and it might
even have been on python-dev, but I can't lay my hands on the thread.
In short, Microsoft retries and waits a while when the far end says
"no thanks" to a connection attempt, instead of immediately returning
the connection failure the way Linux and etc and etc do.  This applies
to IPV4, too.

--RDM



From rhodri at wildebst.demon.co.uk  Sun Feb  1 18:39:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 01 Feb 2009 23:39:14 -0000
Subject: is python Object oriented??
In-Reply-To: <4985DC6F.4030106@holdenweb.com>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
	<4985DC6F.4030106@holdenweb.com>
Message-ID: <op.uoo5boxta8ncjz@gnudebst>

On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Stephen Hansen wrote:
>> [...]
>> don't play with anyone else's
>> privates.
>>
> A good rule in life as well as programming.

Unless, of course, you're both consenting adults.

What?  Someone had to say it!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From aahz at pythoncraft.com  Sun Feb  1 18:42:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 15:42:00 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
Message-ID: <gm5c08$386$1@panix3.panix.com>

In article <e85efc5f-d141-4c5a-b228-8dba960a6838 at l33g2000pri.googlegroups.com>,
MattBD  <matthewbdaly at googlemail.com> wrote:
>
>I like Vim, that works really well for me when coding in Python.
>Enable syntax highlighting and it's a great development environment.
>It's a little tough at first but run vimtutor and you'll soon start to
>get the hang of it.

Just to register a contrary opinion: I *hate* syntax highlighting
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From clp2 at rebertia.com  Sun Feb  1 18:43:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 15:43:50 -0800
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
References: <4986289C.3030205@gmail.com>
Message-ID: <50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>

On Sun, Feb 1, 2009 at 2:56 PM, Stef Mientki <stef.mientki at gmail.com> wrote:
> hello,
>
> Until now I used a simple wrapper around pysqlite and pyodbc to manage my
> databases.
> Now I'm looking for a better solution,
> because I've to support a (for this moment) unknown database,
> and I'm not the one who will choose the database.
>
> Googling, I found SQLalchemy,
> which looks quit good.
>
> But as I only want to choose once,
> I googled for  "SQLalchemy alternatives",
> but it didn't find many answers.
> (Storm / Grok are of no interest, because manipulating the structure of the
> database is a key issue).
>
> Is SQLalchemy the best / most popular database wrapper ?
> Are there any alternatives ?

SQLObject is also probably worth looking at -- http://www.sqlobject.org/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From aahz at pythoncraft.com  Sun Feb  1 18:45:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 15:45:10 -0800
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
Message-ID: <gm5c66$1ve$1@panix3.panix.com>

In article <387f23cd-90e2-46fc-8c91-1c2f6b31c89e at u13g2000yqg.googlegroups.com>,
andrew cooke  <andrew at acooke.org> wrote:
>
>However, i am thinking I could really do with:
>- a mailing list
>- simple bug tracking
>- subversion
>and am wondering which is the best (free) provider for these (the code
>is LGPL open source).  I'd prefer a mailing list to something like
>google groups (although I guess it may be possible to configure a
>gateway) and I could open up my personal subversion server, but that
>seems like a lot of work (not really that interested in moving to
>something other than svn).

Note that it's fairly easy to get a new list hosted at python.org, just
ask postmaster.  I for one won't participate in any list hosted on
Google because of the need for a Google login.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From apt.shansen at gmail.com  Sun Feb  1 18:47:23 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 15:47:23 -0800 (PST)
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
Message-ID: <fqod4okvt27yodafdrUYAxe124vaj_firegpg@mail.gmail.com>

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From bignose+hates-spam at benfinney.id.au  Sun Feb  1 18:55:50 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 10:55:50 +1100
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <87hc3d3e61.fsf@benfinney.id.au>

Stef Mientki <stef.mientki at gmail.com> writes:

> Is SQLalchemy the best / most popular database wrapper ?

In my opinion, yes it's the best. It gives a good ORM (letting you
treat your data as objects and have them persistently stored in the
database), while still allowing all the power and flexibility of full
SQL whenever you need it; and a continuum of options in between (e.g.
a helpful query builder toolkit).

-- 
 \       ?We must respect the other fellow's religion, but only in the |
  `\       sense and to the extent that we respect his theory that his |
_o__)     wife is beautiful and his children smart.? ?Henry L. Mencken |
Ben Finney


From andrew at acooke.org  Sun Feb  1 18:58:26 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 15:58:26 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <e3582a01-57a4-4e75-8dac-fc0dea248fc3@k19g2000yqg.googlegroups.com>

> Is SQLalchemy the best / most popular database wrapper ?

SQLAlchemy is the best SQL library I have ever used.

But it may depend on who you ask.  For me, what makes SQLAlchemy so
good is the way it allows you to use SQL from within Python.  I have
used the ORM side, and that's fine, but it's the way that it doesn't
get in the way of "just" SQL that make it so good.  If I had to choose
a second reason why it's so good it would be the way it emphasises
metadata - it will use table definitions from the database, and it
will let you define schema yourself (in fact, it's an excellent way of
defining complex schema in a platform-independent fashion).

The main drawback is that it is rather complex.  If something doesn't
work, it can be tricky to work out why.  On the other hand, the
documentation is good, and the support (on google groups) is good too
(a developer always replies within 24 hours in my experience).

It does expect you to know SQL - it doesn't try to hide SQL at all.
Whether that is good or bad depends on your POV I guess.

I wish all DB solutions were like this - my hope is that EmpireDB will
do the same for Java, but it's too early to tell...

Andrew


From andrew at acooke.org  Sun Feb  1 19:02:52 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 16:02:52 -0800 (PST)
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
Message-ID: <952e4cda-e2a5-4395-8ac3-6b64aa3c5af0@e3g2000vbe.googlegroups.com>

On Feb 1, 8:45?pm, a... at pythoncraft.com (Aahz) wrote:
> Note that it's fairly easy to get a new list hosted at python.org, just
> ask postmaster. ?I for one won't participate in any list hosted on
> Google because of the need for a Google login.

ah well - i guess you can use pyparsing ;o)

http://code.google.com/p/lepl/

andrew


From gdamjan at gmail.com  Sun Feb  1 19:15:39 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 01:15:39 +0100
Subject: Using lxml to screen scrap a site, problem with charset
Message-ID: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>

So, I'm using lxml to screen scrap a site that uses the cyrillic 
alphabet (windows-1251 encoding). The sites HTML doesn't have the <META 
..content-type.. charset=..> header, but does have a HTTP header that 
specifies the charset... so they are standards compliant enough.

Now when I run this code:

from lxml import html
doc = html.parse('http://a1.com.mk/')
root = doc.getroot()
title = root.cssselect(('head title'))[0]
print title.text

the title.text is ? unicode string, but it has been wrongly decoded as 
latin1 -> unicode

So.. is this a deficiency/bug in lxml or I'm doing something wrong.
Also, what are my other options here?


I'm running Python 2.6.1 and python-lxml 2.1.4 on Linux if matters.

-- 
?????? ( http://softver.org.mk/damjan/ )

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan




From bignose+hates-spam at benfinney.id.au  Sun Feb  1 19:26:24 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 11:26:24 +1100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <874ozd3cr3.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> Just to register a contrary opinion: I *hate* syntax highlighting

On what basis?

-- 
 \       ?The man who is denied the opportunity of taking decisions of |
  `\      importance begins to regard as important the decisions he is |
_o__)                        allowed to take.? ?C. Northcote Parkinson |
Ben Finney


From andrew at acooke.org  Sun Feb  1 19:28:53 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 16:28:53 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org> 
	<e3582a01-57a4-4e75-8dac-fc0dea248fc3@k19g2000yqg.googlegroups.com>
Message-ID: <7bdf4281-0f10-48ac-bf96-b91c481412b8@f33g2000vbf.googlegroups.com>


> I wish all DB solutions were like this - my hope is that EmpireDB will
> do the same for Java, but it's too early to tell...

Hmmm - I should correct the above.  I had assumed EmpireDB was new,
because it's an Apache Incubator project, but now I look at their site
I see it's actually been around for years.  I need to try it out...

Sorry about the error,
Andrew


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 19:31:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 00:31:38 GMT
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 12:01:11 -0800, Stephen Hansen wrote:

> <br><div class="gmail_quote"><blockquote class="gmail_quote"
> style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
> 0.8ex; padding-left: 1ex;"><br> I'd like to know how to elegantly check
> a list for the membership of<br> any of its items to another list.
> &nbsp;Not caring for elegance, I would<br> use the following code:<br>
> </blockquote><div><br>That's one of the useful properties of
> sets:<br><br>&gt;&gt;&gt; a = [1,2,3]<br>&gt;&gt;&gt; b =
> [3,4,5,6]<br>&gt;&gt;&gt; set(a) &amp;
> set(b)<br>set([3])<br>&gt;&gt;&gt;
> set(a).intersection(b)<br>set([3])<br> <br>That's two spellings of the
> same thing. As for testing: an empty set like an empty list will return
> false, so "if set(a) &amp; set(b):" will be true or false based on if
> there's any commonalities between the two
> lists.<br><br>--Stephen</div></div><br>


Stephen, do you see the utter mess your posts look like to some others?

Please ensure you send plain text messages to Usenet, not HTML. If you 
absolutely can't avoid using an insecure and bloated page layout language 
instead of text, please ensure that your News or mail client is set to 
send plain text as well as HTML.

If your news/mail client doesn't follow Usenet standards, then (1) change 
the application you use to one that does; or (2) complain to the vendor 
until they fix their product.


Thank you,



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 20:00:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 01:00:18 GMT
Subject: is python Object oriented??
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
	<mailman.8532.1233509503.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:

> I think it's noticeable that the people who have been arguing against
> what I might tipify as this "libertarian view" are those for whom the
> consequences of programming error are serious to extreme.
...
> Just the same, it still doesn't save them from the consequences of
> interface miscommunication, as int he case of the Mars lander that
> crashed because one module provided a (probably strongly-typed) value in
> meters, and the recipient interpreted it as (probably strongly-typed)
> feet, cutting the engine out too early.

Of course. Nor will data hiding prevent off-by-one errors, or errors of 
logic, or data corruption, or stray cosmic rays flipping bits in memory. 
But it will prevent *some* errors. It's one tool in an entire toolbox for 
writing correct code, not a magic bullet.

Python already has enforced data hiding, but only for built-ins. 
Consequently, anyone who uses a list can absolutely, categorically trust 
that len(alist) will return the actual length of alist, and not some 
mangled value stuffed into alist by some arbitrary piece of code 
somewhere else.

(For those unaware, in CPython lists are arrays. They store the current 
length as a private value inaccessible to Python code.)

Short of cosmic rays flipping bits, any built-in list you receive from 
anywhere is going to have a valid length, and no pure-Python code can 
make it invalid. To read some of the posts in this thread, one would be 
forgiven for thinking that this most be a disaster of the highest 
consequences, unPythonic to the extreme, an example of unfree B&D 
programming so unpleasant to work with that people hate every second of 
it.

Except of course it isn't. Nobody sensibly complains that they can't 
mangle the length of a list, or move keys around inside dicts, or 
whatever. This data hiding is a good thing.

All I want is the ability to do with Python classes what I can do with C 
extension types. I don't think that's an *unreasonable* ask, even if it 
is *unpractical* given the current design of Python.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 20:06:53 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 01:06:53 GMT
Subject: accessing elements of a tuple
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
	<mailman.8524.1233498768.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.01.06.55@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 09:32:42 -0500, D'Arcy J.M. Cain wrote:

> On Sun, 01 Feb 2009 19:23:58 +1100
> Steven D'Aprano <steve at pearwood.info> wrote:
>> D'Arcy J.M. Cain wrote:
>> 
>> > First of all, list is a reserved word. ?Don't use it as a variable
>> > name.
>> 
>> Unless you mean to. Shadowing built-ins is only a bad thing when you do
>> it by accident.
> 
> I suppose but I am having a hard time trying to think of some good
> reason to replace a builtin function that creates a list with a list
> object.
> 
>>>> list = list((1,2,3))
>>>> list((1,2,3))
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: 'list' object is not callable


There may not be a positive reason in favour of it, but in a small 
function that doesn't call list() and never will, there's no reason 
*against* using the name 'list'. Sometimes generic names like 'list' (or 
if you prefer, 'alist') are sensible, and in those cases, shadowing the 
list built-in may be a matter of taste.

I personally don't like it, but some people obviously do.



-- 
Steven


From clp2 at rebertia.com  Sun Feb  1 20:19:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 17:19:39 -0800
Subject: question about Z=[[x for y in range(1,
	2) if AList[x]==y] for x in range(0,5)]
In-Reply-To: <77e831100901301733s4ebe3ca7i251a79955894f00e@mail.gmail.com>
References: <77e831100901301733s4ebe3ca7i251a79955894f00e@mail.gmail.com>
Message-ID: <50697b2c0902011719p6fa50076yd79d2fc3dce8771e@mail.gmail.com>

On Fri, Jan 30, 2009 at 5:33 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Z=[[x for y in range(1,2) if AList[x]==y] for x in range(0,5)]
> I am not sure how to ask this but which "for" is looped first? I could
> test but was wondering if there was a nice explanation I could apply
> to future situations.

The outer one. Remember that you can always rewrite (a) list
comprehension(s) into (an) equivalent for-loop(s). In this case:
Z = []
for x in range(0,5):
    _tmp = []
    for y in range(1,2):
        if AList[x]==y:
            _tmp.append(x)
    Z.append(_tmp)

Or alternatively, imagine if the inner list comprehension was instead
a function call:

#assuming AList is a global var
def inner_list_comp(x):
    return [x for y in range(1,2) if AList[x]==y]

Z=[inner_list_comp(x) for x in range(0,5)]

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From kyrie at uh.cu  Sun Feb  1 20:46:41 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 1 Feb 2009 20:46:41 -0500
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<mailman.8532.1233509503.3487.python-list@python.org>
	<pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
Message-ID: <200902012046.41286.kyrie@uh.cu>

On Sunday 01 February 2009 08:00:18 pm Steven D'Aprano wrote:
> On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:

> Except of course it isn't. Nobody sensibly complains that they can't 
> mangle the length of a list, or move keys around inside dicts, or 
> whatever. This data hiding is a good thing.

If lists and dictionaries were not C types, and python didn't have to shield 
us from the mess that is C and its pointers, that enforcement may not be such 
a good thing. And, while we are at it, that is not python having "selective" 
enforcement of data hiding but only for C, that's C/C++ having data hiding 
and not exporting the attributes back to python.

> All I want is the ability to do with Python classes what I can do with C
> extension types. I don't think that's an *unreasonable* ask, even if it
> is *unpractical* given the current design of Python.

Well, then. Do you want dynamic checks? Go fix Bastion/rexec (that would be a 
_good_ thing, valuable for way more than data hiding). Or do you want static 
checks? In that case, you have it already.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From steve at holdenweb.com  Sun Feb  1 20:49:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 20:49:20 -0500
Subject: is python Object oriented??
In-Reply-To: <op.uoo5boxta8ncjz@gnudebst>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<4985DC6F.4030106@holdenweb.com>
	<op.uoo5boxta8ncjz@gnudebst>
Message-ID: <gm5jf0$v1i$1@ger.gmane.org>

Rhodri James wrote:
> On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com>
> wrote:
> 
>> Stephen Hansen wrote:
>>> [...]
>>> don't play with anyone else's
>>> privates.
>>>
>> A good rule in life as well as programming.
> 
> Unless, of course, you're both consenting adults.
> 
> What?  Someone had to say it!
> 
Nearly included it myself, but decided not to deny someone else the
simple pleasure of posting it :)

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 20:53:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 20:53:55 -0500
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<mailman.8532.1233509503.3487.python-list@python.org>
	<pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
Message-ID: <gm5jnk$vmg$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:
> 
>> I think it's noticeable that the people who have been arguing against
>> what I might tipify as this "libertarian view" are those for whom the
>> consequences of programming error are serious to extreme.
> ...
>> Just the same, it still doesn't save them from the consequences of
>> interface miscommunication, as int he case of the Mars lander that
>> crashed because one module provided a (probably strongly-typed) value in
>> meters, and the recipient interpreted it as (probably strongly-typed)
>> feet, cutting the engine out too early.
> 
> Of course. Nor will data hiding prevent off-by-one errors, or errors of 
> logic, or data corruption, or stray cosmic rays flipping bits in memory. 
> But it will prevent *some* errors. It's one tool in an entire toolbox for 
> writing correct code, not a magic bullet.
> 
> Python already has enforced data hiding, but only for built-ins. 
> Consequently, anyone who uses a list can absolutely, categorically trust 
> that len(alist) will return the actual length of alist, and not some 
> mangled value stuffed into alist by some arbitrary piece of code 
> somewhere else.
> 
Unless, of course, some piece of code masks (or worse still, replaces)
the len() function in __builtins__ with one of their own. There's no
such thing as a foolproof system. The minute you think you have one the
world comes up with a superior class of fool.

> (For those unaware, in CPython lists are arrays. They store the current 
> length as a private value inaccessible to Python code.)
> 
> Short of cosmic rays flipping bits, any built-in list you receive from 
> anywhere is going to have a valid length, and no pure-Python code can 
> make it invalid. To read some of the posts in this thread, one would be 
> forgiven for thinking that this most be a disaster of the highest 
> consequences, unPythonic to the extreme, an example of unfree B&D 
> programming so unpleasant to work with that people hate every second of 
> it.
> 
> Except of course it isn't. Nobody sensibly complains that they can't 
> mangle the length of a list, or move keys around inside dicts, or 
> whatever. This data hiding is a good thing.
> 
> All I want is the ability to do with Python classes what I can do with C 
> extension types. I don't think that's an *unreasonable* ask, even if it 
> is *unpractical* given the current design of Python.
> 
I think the whole issue has received far more attention than is good for
it. Your requirements seem quite reasonable to me, even though I doubt
I'd ever use them. But it isn't *me* you have to persuade to get them in
the language, is it?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 21:06:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 21:06:49 -0500
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <gm5b2f$dcp$1@ger.gmane.org>
References: <gm4fcr$tr7$1@online.de>	<mailman.8540.1233516823.3487.python-list@python.org>	<gm58jn$nu3$1@online.de>
	<gm5b2f$dcp$1@ger.gmane.org>
Message-ID: <gm5kfp$vmg$2@ger.gmane.org>

rdmurray at bitdance.com wrote:
> Quoth Christoph Zwerschke <cito at online.de>:
>> rdmurray at bitdance.com schrieb:
>>> Quoth Christoph Zwerschke <cito at online.de>:
>>>>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>>>>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>>>>    first, then the IPv4 address. Since the IPv6 address is checked first,
>>>>    this gives a timeout and causes the slow connect() call. The order by
>>>>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>>>>    on the glibc version, so it may be a problem on other platforms, too.
>>> Based on something I read in another thread, this appears to be a problem
>>> only under Windows.  Everybody else implemented the TCP/IP stack according
>>> to spec, and the IPV6 connect attempt times out immediately, producing
>>> no slowdown.
>>>
>>> Microsoft, however....
>> The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
>> written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
>> returns IPv6 addresses first is not wrong in itself.
>>
>> For this discussion, see also
>> http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
>> https://bugzilla.redhat.com/show_bug.cgi?id=190495
>>
>> But yes, I also wonder why the connect to the IPv6 loopback address does 
>> not time out more quickly on Windows.
> 
> Right, it's not the order of the returned items that's the Microsoft
> weirdness, it's the long timeout on an attempt to connect to something
> that doesn't exist.  There was a long discussion about this, and it might
> even have been on python-dev, but I can't lay my hands on the thread.
> In short, Microsoft retries and waits a while when the far end says
> "no thanks" to a connection attempt, instead of immediately returning
> the connection failure the way Linux and etc and etc do.  This applies
> to IPV4, too.
> 
Search for the subject line "socket.create_connection slow" - this was
discovered by Kristjan Valur Jonsson. It certainly seems like a
Microsoft weirdness.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From casevh at gmail.com  Sun Feb  1 21:20:15 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 18:20:15 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com>
Message-ID: <9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com>

On Feb 1, 1:04?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
>
> > On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > > which is probably very inefficient, but I can't see anything better.....
>
> > > Tim
>
> > Take a look at gmpy and the is_power function. I think it will do
> > exactly what you want.
>
> And the root function will give you the root AND tell you whether
> it was an integral root:
>
> >>> gmpy.root(a,13)
>
> (mpz(3221), 0)
>
> In this case, it wasn't.
>
I think the original poster wants to know if a large number has an
exact integral root for any exponent. is_power will give you an answer
to that question but won't tell you what the root or exponent is. Once
you know that the number is a perfect power, you can root to find the
root.

>
> >http://code.google.com/p/gmpy/
>
> > casevh
>
>



From flouger at gmail.com  Sun Feb  1 21:23:37 2009
From: flouger at gmail.com (Sam Price)
Date: Sun, 1 Feb 2009 18:23:37 -0800 (PST)
Subject: Question about wx folder browser widget
Message-ID: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>

Is there any good wx widgets that provide the same feel as folder/file
browser.
I want to be notified when a user tries to drag and drop a file/folder
on the widget, and then copy that file/folder to a new folder an do
operations on it.

Wanted to check first to see if something exists, and not reinvent the
wheel.

Thank you,
Sam Price


From lxkain at gmail.com  Sun Feb  1 21:31:34 2009
From: lxkain at gmail.com (LX)
Date: Sun, 1 Feb 2009 18:31:34 -0800 (PST)
Subject: AssertionError not caught?
Message-ID: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>

This one has me mystified good!

This works (print statement is executed as the Exception is caught) as
advertised:
    try:
        raise AssertionError
    except AssertionError:
        print "caught AssertionError"


But this one does not:

   def test():
        raise AssertionError

    try:
        test()
    except AssertionError:
        print "caught AssertionError"

other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
[GCC 4.0.1 (Apple Computer, Inc. build 5341)].

Is this a bug? Any hints / help would be much appreciated! Thank you.


From clp2 at rebertia.com  Sun Feb  1 21:44:14 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 18:44:14 -0800
Subject: AssertionError not caught?
In-Reply-To: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>

On Sun, Feb 1, 2009 at 6:31 PM, LX <lxkain at gmail.com> wrote:
> This one has me mystified good!
>
> This works (print statement is executed as the Exception is caught) as
> advertised:
>    try:
>        raise AssertionError
>    except AssertionError:
>        print "caught AssertionError"
>
>
> But this one does not:
>
>   def test():
>        raise AssertionError
>
>    try:
>        test()
>    except AssertionError:
>        print "caught AssertionError"
>
> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
>
> Is this a bug? Any hints / help would be much appreciated! Thank you.

My Mac begs to differ:

~ $ cat Desktop/tmp.py
def test():
   raise AssertionError

try:
   test()
except AssertionError:
   print "caught AssertionError"
~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5
Desktop/tmp.py
caught AssertionError
~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5
Python 2.5.1 (r251:54863, Feb  4 2008, 21:48:13)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin

The problem must lie elsewhere.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gdamjan at gmail.com  Sun Feb  1 21:50:16 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 03:50:16 +0100
Subject: Completer with history for Python 3 ?
Message-ID: <9k3i56-2d3.ln1@archaeopteryx.softver.org.mk>

I've been long using this recipe [1] ?Completer with history viewer 
support and more features? with the interactive prompt of python 2.x
But it's not compatible with Python 3.0

Anyone know of a similar functionality for Python 3.0 or I should try to 
port this script?

[1]
http://code.activestate.com/recipes/496822/

-- 
?????? ( http://softver.org.mk/damjan/ )

Spammers scratch here with a diamond to find my address:
|||||||||||||||||||||||||||||||||||||||||||||||



From lxkain at gmail.com  Sun Feb  1 21:51:53 2009
From: lxkain at gmail.com (Alexander Kain)
Date: Sun, 1 Feb 2009 18:51:53 -0800
Subject: AssertionError not caught?
In-Reply-To: <50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
	<50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>
Message-ID: <88312E27-1EFD-4AEB-9C4C-87B7D9F196CA@gmail.com>

Thank you for restoring sanity to my world!

Indeed, it seems to have to do with the way that the WingIDE debugger  
works - it actually catches the error correctly , but it -->sets a  
breakpoint at the original raise first<---. This only occurs for the  
AssertionError. The debugger can then be continued.

Thank you again!

On Feb 1, 2009, at 6:44 PM, Chris Rebert wrote:

> On Sun, Feb 1, 2009 at 6:31 PM, LX <lxkain at gmail.com> wrote:
>> This one has me mystified good!
>>
>> This works (print statement is executed as the Exception is caught)  
>> as
>> advertised:
>>   try:
>>       raise AssertionError
>>   except AssertionError:
>>       print "caught AssertionError"
>>
>>
>> But this one does not:
>>
>>  def test():
>>       raise AssertionError
>>
>>   try:
>>       test()
>>   except AssertionError:
>>       print "caught AssertionError"
>>
>> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with  
>> the
>> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
>> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
>>
>> Is this a bug? Any hints / help would be much appreciated! Thank you.
>
> My Mac begs to differ:
>
> ~ $ cat Desktop/tmp.py
> def test():
>   raise AssertionError
>
> try:
>   test()
> except AssertionError:
>   print "caught AssertionError"
> ~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/ 
> python2.5
> Desktop/tmp.py
> caught AssertionError
> ~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/ 
> python2.5
> Python 2.5.1 (r251:54863, Feb  4 2008, 21:48:13)
> [GCC 4.0.1 (Apple Inc. build 5465)] on darwin
>
> The problem must lie elsewhere.
>
> Cheers,
> Chris
>
> -- 
> Follow the path of the Iguana...
> http://rebertia.com



From bignose+hates-spam at benfinney.id.au  Sun Feb  1 21:55:01 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 13:55:01 +1100
Subject: AssertionError not caught?
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <87r62h1ray.fsf@benfinney.id.au>

LX <lxkain at gmail.com> writes:

> This works (print statement is executed as the Exception is caught)
> as advertised:

You don't actually show us the output you get.

>     try:
>         raise AssertionError
>     except AssertionError:
>         print "caught AssertionError"

    >>> try:
    ...     raise AssertionError
    ... except AssertionError:
    ...     print "caught AssertionError"
    ...
    caught AssertionError

> But this one does not:
> 
>    def test():
>         raise AssertionError
> 
>     try:
>         test()
>     except AssertionError:
>         print "caught AssertionError"

    >>> def test():
    ...     raise AssertionError
    ...
    >>> try:
    ...     test()
    ... except AssertionError:
    ...     print "caught AssertionError"
    ... 
    caught AssertionError

> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with
> the standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13) [GCC
> 4.0.1 (Apple Computer, Inc. build 5341)].

    Python 2.5.2 (r252:60911, Jan  4 2009, 22:51:23)
    [GCC 4.3.2] on linux2

> Is this a bug?

It's much more likely to be a difference between the code you posted
here and the code you're actually running.

-- 
 \           ?It ain't so much the things we don't know that get us in |
  `\    trouble. It's the things we know that ain't so.? ?Artemus Ward |
_o__)                                       (1834-67), U.S. journalist |
Ben Finney


From steve at holdenweb.com  Sun Feb  1 21:58:07 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 21:58:07 -0500
Subject: Question about wx folder browser widget
In-Reply-To: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
References: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
Message-ID: <gm5ng0$68l$1@ger.gmane.org>

Sam Price wrote:
> Is there any good wx widgets that provide the same feel as folder/file
> browser.
> I want to be notified when a user tries to drag and drop a file/folder
> on the widget, and then copy that file/folder to a new folder an do
> operations on it.
> 
> Wanted to check first to see if something exists, and not reinvent the
> wheel.
> 
There's TreeCtrl, and CustomTreeCtrl. I don't know whether they can be
used with drag and drop, but take alook at

  http://wiki.wxpython.org/DragAndDrop

to see some code and get an idea of how to find out whether it will
adapt to those controls.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 22:01:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 22:01:29 -0500
Subject: AssertionError not caught?
In-Reply-To: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <gm5nma$68l$2@ger.gmane.org>

LX wrote:
> This one has me mystified good!
> 
> This works (print statement is executed as the Exception is caught) as
> advertised:
>     try:
>         raise AssertionError
>     except AssertionError:
>         print "caught AssertionError"
> 
> 
> But this one does not:
> 
>    def test():
>         raise AssertionError
> 
>     try:
>         test()
>     except AssertionError:
>         print "caught AssertionError"
> 
> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
> 
> Is this a bug? Any hints / help would be much appreciated! Thank you.

This works for me under Cygwin:

>>> def test():
...     raise AssertionError
...
>>> try:
...     test()
... except AssertionError:
...     print "caught AssertionError"
...
caught AssertionError
>>>

I note from your indentation that it looks as though your code was
guarded by some other statement. Is it possible it wasn't executed at all?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Sun Feb  1 22:11:39 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 03:11:39 +0000 (UTC)
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <gm5o9b$82i$1@ger.gmane.org>

Quoth Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:
> On Sun, 01 Feb 2009 12:01:11 -0800, Stephen Hansen wrote:
> 
> > <br><div class="gmail_quote"><blockquote class="gmail_quote"
> > style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
> > 0.8ex; padding-left: 1ex;"><br> I'd like to know how to elegantly check
> > a list for the membership of<br> any of its items to another list.
> > &nbsp;Not caring for elegance, I would<br> use the following code:<br>
> > </blockquote><div><br>That's one of the useful properties of
> > sets:<br><br>&gt;&gt;&gt; a = [1,2,3]<br>&gt;&gt;&gt; b =
> > [3,4,5,6]<br>&gt;&gt;&gt; set(a) &amp;
> > set(b)<br>set([3])<br>&gt;&gt;&gt;
> > set(a).intersection(b)<br>set([3])<br> <br>That's two spellings of the
> > same thing. As for testing: an empty set like an empty list will return
> > false, so "if set(a) &amp; set(b):" will be true or false based on if
> > there's any commonalities between the two
> > lists.<br><br>--Stephen</div></div><br>
> 
> 
> Stephen, do you see the utter mess your posts look like to some others?

I don't even see Stephen Hansen's posts.  My newsreader just shows the
header and says "[HTML part not displayed]".

--RDM



From apt.shansen at gmail.com  Sun Feb  1 22:16:49 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 19:16:49 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <7a9c25c20902011916t7c0d4dd9n2225ba80ef49e75b@mail.gmail.com>

> Stephen, do you see the utter mess your posts look like to some others?

Whoops, I was experimenting with a new Firefox add-on that fiddled
with Gmail, and hadn't noticed it changed my output format to HTML out
from under me.

Sorry!

--S


From apt.shansen at gmail.com  Sun Feb  1 22:34:46 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 19:34:46 -0800
Subject: Auto Logon to site and get page
In-Reply-To: <456128.62923.qm@web112207.mail.gq1.yahoo.com>
References: <456128.62923.qm@web112207.mail.gq1.yahoo.com>
Message-ID: <7a9c25c20902011934u62c61f83w40e4444fe883589@mail.gmail.com>

> This doesn't however, it just sends me back to the main login page, doenst
> say invalid password or anything. I've checked, yes the python hmac hash
> function produces the same results (encrypted password) as the md5.js file.
> Does anyone know what I am doing wrong??

My guess? After you successfully login the webpage is setting a cookie
on your browser with a token to mark you as authenticated and let you
in. Lots of websites do that: I don't think urllib2 is handling that
by itself so you may need to. You also may have to set a User-agent
header to convince it you're legitimate.

I googled briefly and came up with
http://www.voidspace.org.uk/python/articles/cookielib.shtml which may
be totally useless or of great value. I am not providing it as a
solution, it just at a brief glance looks potentially relevant :)

--S


From jabar004 at gmail.com  Sun Feb  1 22:35:05 2009
From: jabar004 at gmail.com (JuanPablo)
Date: Mon, 2 Feb 2009 00:35:05 -0300
Subject: call other program
Message-ID: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>

hi,
  I have a newbie question.
In bash is posible call other program, send and recieve message with this.

example:
$ python  > output << EOF
> print "hello world"
> EOF
$ cat output
hello world

in python exist some similar ?

many thanks
JuanPablo
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090202/fa545195/attachment.html>

From clp2 at rebertia.com  Sun Feb  1 22:37:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 19:37:09 -0800
Subject: call other program
In-Reply-To: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>
References: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>
Message-ID: <50697b2c0902011937u42c6d437uad8f6b7d5726a24f@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:35 PM, JuanPablo <jabar004 at gmail.com> wrote:
> hi,
>   I have a newbie question.
> In bash is posible call other program, send and recieve message with this.
>
> example:
> $ python  > output << EOF
>> print "hello world"
>> EOF
> $ cat output
> hello world
>
> in python exist some similar ?

See the `subprocess` module -- http://docs.python.org/library/subprocess.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gdamjan at gmail.com  Sun Feb  1 22:38:12 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 04:38:12 +0100
Subject: Completer with history for Python 3 ?
References: <9k3i56-2d3.ln1@archaeopteryx.softver.org.mk>
Message-ID: <4e6i56-3e5.ln1@archaeopteryx.softver.org.mk>

> I've been long using this recipe [1] ?Completer with history viewer
> support and more features? with the interactive prompt of python 2.x
> But it's not compatible with Python 3.0
> 
> Anyone know of a similar functionality for Python 3.0 or I should try
> to port this script?
> 
> [1]
> http://code.activestate.com/recipes/496822/
 
Well, I've made a patch that makes it kinda work
http://paste.lisp.org/display/74707

it does work except that the irlcompleter doesn't complete filenames or 
usernames... any idea why?


-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From cjns1989 at gmail.com  Sun Feb  1 22:46:54 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 01 Feb 2009 22:46:54 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <874ozd3cr3.fsf@benfinney.id.au>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
Message-ID: <20090202034654.GD30237@turki.gavron.org>

On Sun, Feb 01, 2009 at 07:26:24PM EST, Ben Finney wrote:
> aahz at pythoncraft.com (Aahz) writes:
> 
> > Just to register a contrary opinion: I *hate* syntax highlighting
> 
> On what basis?

Real men hate syntax highlighting.


From bignose+hates-spam at benfinney.id.au  Sun Feb  1 22:47:51 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 14:47:51 +1100
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
	<mailman.8560.1233544309.3487.python-list@python.org>
Message-ID: <87myd51ouw.fsf@benfinney.id.au>

rdmurray at bitdance.com writes:

> I don't even see Stephen Hansen's posts. My newsreader just shows
> the header and says "[HTML part not displayed]".

Likewise.

Note to people who want to communicate in online fora: Set your client
to generate a ?text/plain? body only. HTML is either irrelevant to
your message (so don't generate it), or will result in your message
not even being seen at all by some readers (as in this case).

-- 
 \        ?If it ain't bust don't fix it is a very sound principle and |
  `\      remains so despite the fact that I have slavishly ignored it |
_o__)                                     all my life.? ?Douglas Adams |
Ben Finney


From sjmachin at lexicon.net  Sun Feb  1 22:52:04 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 19:52:04 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com> 
	<e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com> 
	<fe74d94e-c100-4e45-a6f8-88d886f32ccc@r10g2000prf.googlegroups.com>
Message-ID: <26d7ffc0-1bca-452c-b8c2-faca5e005e07@w1g2000prm.googlegroups.com>

On Feb 2, 10:18?am, vsoler <vicente.so... at gmail.com> wrote:
> On 1 feb, 23:57, John Machin <sjmac... at lexicon.net> wrote:
>
> > On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > r: in the open statement, why do you use 'rb' as 2nd argument? b is
> > > supposed to be binary, and my file is text!
>
> > Because unlike Stephen, r has read the csv manual. Binary mode is
> > required to handle properly cases like '\n' embedded in a field --
> > something which can easily happen when the data has been extracted
> > from a database with slack data-entry validation.
>
> Where can I get the csv manual?

http://www.python.org/doc/2.6/library/csv.html

If you're on Windows, you've got it already:
Start > All Programs > Python 2.6 > Python Manuals
type "csv" (without the quotes) into the textbox
hit the Enter key



From hungvn94 at gmail.com  Sun Feb  1 23:16:45 2009
From: hungvn94 at gmail.com (Hung Vo)
Date: Sun, 1 Feb 2009 20:16:45 -0800 (PST)
Subject: is python Object oriented??
References: <mailman.8529.1233508222.3487.python-list@python.org>
Message-ID: <f8af3a0d-eda5-4ae9-852a-66595a3a0694@v5g2000prm.googlegroups.com>

On Feb 2, 4:10?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!
>
>
> I was long-winded the last time I responded to this point so no one probably read it :)

Yes, we read it. You made good points!!

Cheers,
Hung


From david.lyon at preisshare.net  Sun Feb  1 23:17:50 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 01 Feb 2009 23:17:50 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <497FAFE4.4040602@gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
Message-ID: <83900549676010b8244969ece9319a78@preisshare.net>

Hi all, 

I am pleased to announce that we have started a new python 
project on sourceforge. 

  Python Package Manager 
  pythonpkgmgr.sourceforge.net 

The goal is to provide a cross platform GUI tool that will 
vastly simplify loading and installing packages under python. 

 - written in python 
 - use WXWidgets for cross compatability
 - utilises distutils
 - provide a GUI wrapper for EasyInstall and pip
 - fetches packages from http://pypi.python.org/pypi 
   using their XML-RPC interface. 

Feel free to apply to join the project and help us build the solution that
we all need and deserve. 

Regards David Lyon 



From prologic at shortcircuit.net.au  Sun Feb  1 23:47:29 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Mon, 2 Feb 2009 14:47:29 +1000
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <83900549676010b8244969ece9319a78@preisshare.net>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
Message-ID: <e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:17 PM, David Lyon <david.lyon at preisshare.net> wrote:
> Hi all,
>
> I am pleased to announce that we have started a new python
> project on sourceforge.
>
>  Python Package Manager
>  pythonpkgmgr.sourceforge.net
>
> The goal is to provide a cross platform GUI tool that will
> vastly simplify loading and installing packages under python.
>
>  - written in python
>  - use WXWidgets for cross compatability
>  - utilises distutils
>  - provide a GUI wrapper for EasyInstall and pip
>  - fetches packages from http://pypi.python.org/pypi
>   using their XML-RPC interface.
>
> Feel free to apply to join the project and help us build the solution that
> we all need and deserve.
>
> Regards David Lyon

What's wrong with Enstaller from Enthought ?

Can I make a few suggestions ?

To be truly cross platform, consider
using the Tcl/Tk toolkit rather tahn
wxWindows. Why ? Because Tcl/TK
is packaged and provided along with
most Python distributions.

Also, to reduce the amount of work
you as developers need to do and to
aid in the "code reuse" philosophy,
I would not simply have wrappers around
easy_install and pip, I would integrate
as best as you can into these libraries
without trying to add or rewrite too much.

Also, consider integrating with yolk
as well, as it provides some food features
and functionality that easy_install and pip
don't provide.

cheers
James


From david.lyon at preisshare.net  Sun Feb  1 23:57:05 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 01 Feb 2009 23:57:05 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
Message-ID: <f16976575cae1062e8fbdb364bca77ea@preisshare.net>

> What's wrong with Enstaller from Enthought ?

for a start....

on https://svn.enthought.com/enthought/wiki/Enstaller

it claims to be depracated...

> Can I make a few suggestions ?

Sure..

> To be truly cross platform, consider
> using the Tcl/Tk toolkit rather tahn
> wxWindows. Why ? Because Tcl/TK
> is packaged and provided along with
> most Python distributions.

I agree with your point..

The problem is that Tcl/TK is a functionaly
handicapped and results in a less powerful GUI.

In an installer, it is not so hard to install
the wxWidgets dll (under windows)

But later, I won't mind redoing it in tk if
it becomes too much of a hassle.
 
> I would not simply have wrappers around
> easy_install and pip, I would integrate
> as best as you can into these libraries
> without trying to add or rewrite too much.

Sure... I agree

> Also, consider integrating with yolk
> as well, as it provides some food features
> and functionality that easy_install and pip
> don't provide.

Thanks - I will check out your suggestions in
detail.

Take care

David




From prologic at shortcircuit.net.au  Mon Feb  2 00:24:06 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Mon, 2 Feb 2009 15:24:06 +1000
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <f16976575cae1062e8fbdb364bca77ea@preisshare.net>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
Message-ID: <e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:57 PM, David Lyon <david.lyon at preisshare.net> wrote:
>> To be truly cross platform, consider
>> using the Tcl/Tk toolkit rather tahn
>> wxWindows. Why ? Because Tcl/TK
>> is packaged and provided along with
>> most Python distributions.
>
> I agree with your point..
>
> The problem is that Tcl/TK is a functionaly
> handicapped and results in a less powerful GUI.
>
> In an installer, it is not so hard to install
> the wxWidgets dll (under windows)
>
> But later, I won't mind redoing it in tk if
> it becomes too much of a hassle.

David, I would really recommend that you
seriously consider using the Tcp/Tk toolkit.
Why ? Because of my point above, you'll
find the tool will most likely have a greater
impact and uptake than one requiring a user
or developer to install a 3rd party toolkit
and library just to use your gui package
manager :)

Trust me when I say this, the simpler you
make this, the better. "Powerful" is meaningless
in the context of programming - it has no
meaning. If you meant wxWindows/wxWidgets
are more feature-rich, then yes I agree - but
at what cost ? :)

My 2c,

cheers
James


From an00na at gmail.com  Mon Feb  2 01:01:17 2009
From: an00na at gmail.com (an0)
Date: Sun, 1 Feb 2009 22:01:17 -0800 (PST)
Subject: Why such different HTTP response results between 2.5 and 3.0
Message-ID: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>

Below are two semantically same snippets for querying the same partial
HTTP response, for Python2.5 and Python 3.0 respectively.
However, the 3.0 version returns a not-so-right result(msg) which is a
bytes of length 239775, while the 2.5 version returns a good msg which
is a 239733 byte-long string that is the content of a proper zip file.
I really can't figure out what's wrong, thought I've sought out some
"\r\n" segments in msg 3.0 that is absent in msg 2.5.
So are there anyone could give me some hints? Thanks in advance.

Code:

# Python 2.5
import urllib2
auth_handler = urllib2.HTTPBasicAuthHandler()
auth_handler.add_password(realm="pluses and minuses",
                          uri='http://www.pythonchallenge.com/pc/hex/
unreal.jpg',
                          user='butter',
                          passwd='fly')
opener = urllib2.build_opener(auth_handler)

req = urllib2.Request('http://www.pythonchallenge.com/pc/hex/
unreal.jpg')
req.add_header('Range', 'bytes=1152983631-')
res = opener.open(req)
msg = res.read()

# Python 3.0
import urllib.request
auth_handler = urllib.request.HTTPBasicAuthHandler()
auth_handler.add_password(realm="pluses and minuses",
                          uri='http://www.pythonchallenge.com/pc/hex/
unreal.jpg',
                          user='butter',
                          passwd='fly')
opener = urllib.request.build_opener(auth_handler)

req = urllib.request.Request('http://www.pythonchallenge.com/pc/hex/
unreal.jpg')
req.add_header('Range', 'bytes=1152983631-')
res = opener.open(req)
msg = res.read()


From mensanator at aol.com  Mon Feb  2 01:02:32 2009
From: mensanator at aol.com (Mensanator)
Date: Sun, 1 Feb 2009 22:02:32 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com>
Message-ID: <81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com>

On Feb 1, 8:20?pm, casevh <cas... at gmail.com> wrote:
> On Feb 1, 1:04?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
> > On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
>
> > > On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > > > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > Tim
>
> > > Take a look at gmpy and the is_power function. I think it will do
> > > exactly what you want.
>
> > And the root function will give you the root AND tell you whether
> > it was an integral root:
>
> > >>> gmpy.root(a,13)
>
> > (mpz(3221), 0)
>
> > In this case, it wasn't.
>
> I think the original poster wants to know if a large number has an
> exact integral root for any exponent. is_power will give you an answer
> to that question but won't tell you what the root or exponent is. Once
> you know that the number is a perfect power, you can root to find the
> root.

But how do you know what exponent to use?

>
>
>
>
>
> > >http://code.google.com/p/gmpy/
>
> > > casevh



From BrianVanderburg2 at aim.com  Mon Feb  2 01:37:13 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Mon, 02 Feb 2009 01:37:13 -0500
Subject: Why such different HTTP response results between 2.5 and 3.0
In-Reply-To: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>
References: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>
Message-ID: <49869499.7070109@aim.com>

an00na at gmail.com wrote:
> Below are two semantically same snippets for querying the same partial
> HTTP response, for Python2.5 and Python 3.0 respectively.
> However, the 3.0 version returns a not-so-right result(msg) which is a
> bytes of length 239775, while the 2.5 version returns a good msg which
> is a 239733 byte-long string that is the content of a proper zip file.
> I really can't figure out what's wrong, thought I've sought out some
> "\r\n" segments in msg 3.0 that is absent in msg 2.5.
> So are there anyone could give me some hints? Thanks in advance.
>
> Code:
>
> # Python 2.5
> import urllib2
> auth_handler = urllib2.HTTPBasicAuthHandler()
> auth_handler.add_password(realm="pluses and minuses",
>                           uri='http://www.pythonchallenge.com/pc/hex/
> unreal.jpg',
>                           user='butter',
>                           passwd='fly')
> opener = urllib2.build_opener(auth_handler)
>
> req = urllib2.Request('http://www.pythonchallenge.com/pc/hex/
> unreal.jpg')
> req.add_header('Range', 'bytes=1152983631-')
> res = opener.open(req)
> msg = res.read()
>
> # Python 3.0
> import urllib.request
> auth_handler = urllib.request.HTTPBasicAuthHandler()
> auth_handler.add_password(realm="pluses and minuses",
>                           uri='http://www.pythonchallenge.com/pc/hex/
> unreal.jpg',
>                           user='butter',
>                           passwd='fly')
> opener = urllib.request.build_opener(auth_handler)
>
> req = urllib.request.Request('http://www.pythonchallenge.com/pc/hex/
> unreal.jpg')
> req.add_header('Range', 'bytes=1152983631-')
> res = opener.open(req)
> msg = res.read()
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
 From what I can tell, Python 2.5 returns the request automatically 
decoded as text.  Python 3.0 returns a bytes object and doesn't decode 
it at all.  I did a test with urlopen:

In 2.5 for http://google.com just get the regular HTML
In 3.0 I get some extras at the start and end:

    191d\r\n at the start
    \r\n0\r\n\r\n at the end

In 2.5, newlines are automatically decoded
In 3.0, the \r\n pairs are kept

I hope their is an easy way to decode it as it was in 2.x

Brian Vanderburg II


From cito at online.de  Mon Feb  2 01:43:59 2009
From: cito at online.de (Christoph Zwerschke)
Date: Mon, 02 Feb 2009 07:43:59 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <mailman.8555.1233540423.3487.python-list@python.org>
References: <gm4fcr$tr7$1@online.de>	<mailman.8540.1233516823.3487.python-list@python.org>	<gm58jn$nu3$1@online.de>	<gm5b2f$dcp$1@ger.gmane.org>
	<mailman.8555.1233540423.3487.python-list@python.org>
Message-ID: <gm64nb$ech$1@online.de>

Steve Holden schrieb:
> Search for the subject line "socket.create_connection slow" - this was
> discovered by Kristjan Valur Jonsson. It certainly seems like a
> Microsoft weirdness.

Thanks for the pointer, Steve. I hadn't seen that yet. I agree that's 
actually the real problem here. The solution suggested in that thread, 
using a dual-stacked socket for the TCPserver, seems a good one to me.

-- Christoph


From meswamy at gmail.com  Mon Feb  2 01:44:35 2009
From: meswamy at gmail.com (swamynathan)
Date: Mon, 2 Feb 2009 12:14:35 +0530
Subject: key capture
Message-ID: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>

hello,
im making a virtual piano in python where on key stroke a wav is played from
a location
now to implement  a fully functional piano i need to have multiple key
stroke captures  ie if 2 or 3 keys pressed then the function which playes
the wav is called with 3 parameters

how to implement this or any other suggestion(i was asked to try multi
threading which dint seem optimal)

-- 
your caring/loving/sincere/oyoyoy[select it urself]
swamynathan.
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From casevh at gmail.com  Mon Feb  2 02:01:58 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 23:01:58 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com> 
	<81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com>
Message-ID: <68b1337a-1938-4765-b28a-dc526dd8e8c1@x6g2000pre.googlegroups.com>

On Feb 1, 10:02?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 1, 8:20 pm, casevh <cas... at gmail.com> wrote:
>
>
>
> > On Feb 1, 1:04 pm, Mensanator <mensana... at aol.com> wrote:
>
> > > On Feb 1, 2:27 am, casevh <cas... at gmail.com> wrote:
>
> > > > On Jan 31, 9:36 pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. At the moment, because of accuracy concerns, I'm doing something like
>
> > > > > for root in powersp:
> > > > > nroot = round(bignum**(1.0/root))
> > > > > if bignum==long(nroot)**root:
> > > > > .........
> > > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > > Tim
>
> > > > Take a look at gmpy and the is_power function. I think it will do
> > > > exactly what you want.
>
> > > And the root function will give you the root AND tell you whether
> > > it was an integral root:
>
> > > >>> gmpy.root(a,13)
>
> > > (mpz(3221), 0)
>
> > > In this case, it wasn't.
>
> > I think the original poster wants to know if a large number has an
> > exact integral root for any exponent. is_power will give you an answer
> > to that question but won't tell you what the root or exponent is. Once
> > you know that the number is a perfect power, you can root to find the
> > root.
>
> But how do you know what exponent to use?

That's the gotcha. :) You still need to test all prime exponents until
you find the correct one. But it is much faster to use is_power to
check whether or not a number has representation as a**b and then try
all the possible exponents than to just try all the possible exponents
on all the numbers.

>
>
>
> > > >http://code.google.com/p/gmpy/
>
> > > > casevh
>
>



From raykyoto at gmail.com  Mon Feb  2 02:05:50 2009
From: raykyoto at gmail.com (Ray)
Date: Sun, 1 Feb 2009 23:05:50 -0800 (PST)
Subject: Import without executing module
Message-ID: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>


Hi all,

I'm quite new to python as I've only just started to learn about it a
few days ago...  I am trying to do something and after reading about
it, I'm still not sure whether or not it can be done.

Basically, someone has created a python script and I would like to
make use of his functions.  I would prefer to not modify his file so
what I would like to do is just write my script and import parts that
are needed.  i.e., I would like to separate my changes from his as
best as I can.  However, that other module has both functions (def's,
which I would like to use) and top-level commands which I don't need
and in fact, prints errors when I import it since it was meant to be
run as a top-level module and not imported in.  i.e., its expecting
arguments to be supplied.

For example, suppose I have a module test.py:

-----
from test2 import foo
foo()

#import test2
#test2.foo()

print "test says hello"
-----

and test2.py:

-----
def foo():
  print "foo is being executed"

print "test2 says hello"
-----

and I would like to run "python test.py" without "test2 says hello"
appearing.  I figured "import test2" would not work, so I thought that
maybe "from" would only take the functions listed, but no.  In the
end, it is just importing all of "test2" and then renaming it:  foo =
test2.foo .

This isn't a very serious problem as I obviously have the source and
can just copy the functions and attribute the original author (that's
ok).  But, it would be nice if I can make use of those functions
without touching that file [test2.py in the above example].

Is this possible?

Thank you!

Ray




From apt.shansen at gmail.com  Mon Feb  2 02:19:09 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:19:09 -0800
Subject: Import without executing module
In-Reply-To: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
Message-ID: <7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:05 PM, Ray <raykyoto at gmail.com> wrote:
> Basically, someone has created a python script and I would like to
> make use of his functions.  I would prefer to not modify his file so
> what I would like to do is just write my script and import parts that
> are needed.  i.e., I would like to separate my changes from his as
> best as I can.  However, that other module has both functions (def's,
> which I would like to use) and top-level commands which I don't need
> and in fact, prints errors when I import it since it was meant to be
> run as a top-level module and not imported in.  i.e., its expecting
> arguments to be supplied.

Unfortunately, that's not possible, I believe. All the top level
commands in a particular Python script are executed: that's how the
functions get created.

--S


From n.kottiyath at gmail.com  Mon Feb  2 02:25:17 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Sun, 1 Feb 2009 23:25:17 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
Message-ID: <f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>

On Feb 2, 12:19?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Sun, Feb 1, 2009 at 11:05 PM, Ray <rayky... at gmail.com> wrote:
> > Basically, someone has created a python script and I would like to
> > make use of his functions. ?I would prefer to not modify his file so
> > what I would like to do is just write my script and import parts that
> > are needed. ?i.e., I would like to separate my changes from his as
> > best as I can. ?However, that other module has both functions (def's,
> > which I would like to use) and top-level commands which I don't need
> > and in fact, prints errors when I import it since it was meant to be
> > run as a top-level module and not imported in. ?i.e., its expecting
> > arguments to be supplied.
>
> Unfortunately, that's not possible, I believe. All the top level
> commands in a particular Python script are executed: that's how the
> functions get created.
>
> --S

Maybe he can wrap the things he dont need inside
if __name__ == '__main__':
check.


From gabriel.rossetti at arimaz.com  Mon Feb  2 02:33:05 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 02 Feb 2009 08:33:05 +0100
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>	<glo9ns$flv$1@zinnia.noc.ucla.edu>
	<497FAFE4.4040602@gmail.com>	<83900549676010b8244969ece9319a78@preisshare.net>	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
Message-ID: <4986A1B1.9070805@arimaz.com>

James Mills wrote:
> On Mon, Feb 2, 2009 at 2:57 PM, David Lyon <david.lyon at preisshare.net> wrote:
>   
>>> To be truly cross platform, consider
>>> using the Tcl/Tk toolkit rather tahn
>>> wxWindows. Why ? Because Tcl/TK
>>> is packaged and provided along with
>>> most Python distributions.
>>>       
>> I agree with your point..
>>
>> The problem is that Tcl/TK is a functionaly
>> handicapped and results in a less powerful GUI.
>>
>> In an installer, it is not so hard to install
>> the wxWidgets dll (under windows)
>>
>> But later, I won't mind redoing it in tk if
>> it becomes too much of a hassle.
>>     
>
> David, I would really recommend that you
> seriously consider using the Tcp/Tk toolkit.
> Why ? Because of my point above, you'll
> find the tool will most likely have a greater
> impact and uptake than one requiring a user
> or developer to install a 3rd party toolkit
> and library just to use your gui package
> manager :)
>   

Well, isn't tkinter being removed? 
(http://www.python.org/dev/peps/pep-3108/)
So the user will have to install it anyways, I think wx is way better 
that tkinter
from a user and a developer's perspective. I think it's time to let it 
go....but hey,
that's just my two cents...

Gabriel
> Trust me when I say this, the simpler you
> make this, the better. "Powerful" is meaningless
> in the context of programming - it has no
> meaning. If you meant wxWindows/wxWidgets
> are more feature-rich, then yes I agree - but
> at what cost ? :)
>
> My 2c,
>
> cheers
> James
> --
> http://mail.python.org/mailman/listinfo/python-list
>   


From apt.shansen at gmail.com  Mon Feb  2 02:36:53 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:36:53 -0800
Subject: Import without executing module
In-Reply-To: <f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
Message-ID: <7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>

> Maybe he can wrap the things he dont need inside
> if __name__ == '__main__':
> check.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yeah but he said he doesn't want to modify the file itself-- if he can
modify the file this can all go away readily, yes.

--S


From sibteym at infotechsw.com  Mon Feb  2 02:41:55 2009
From: sibteym at infotechsw.com (sibteym at infotechsw.com)
Date: Mon, 2 Feb 2009 13:11:55 +0530 (IST)
Subject: how to create data to dump into yaml file
Message-ID: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>

hi
    I have to create a yaml file using my list of objects.shall i need to
create a string using my objects and then load and dump that string or
is there any other way to create the yaml file.

i want a yaml file to be created from [Text, Author,......]in this format
Text:
    - value1
    - value2
    - value 3
Author:
     name: bookName


Thanks
Sibtey Mehdi






From taskinoor.hasan at csebuet.org  Mon Feb  2 02:43:56 2009
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 2 Feb 2009 13:43:56 +0600
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
Message-ID: <79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>

Can anyone explain what is the necessity of executing whole script when
importing. Isn't it enough to just put the module name in the namespace and
execute when some function is called?

On Mon, Feb 2, 2009 at 1:36 PM, Stephen Hansen <apt.shansen at gmail.com>wrote:

> > Maybe he can wrap the things he dont need inside
> > if __name__ == '__main__':
> > check.
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
> Yeah but he said he doesn't want to modify the file itself-- if he can
> modify the file this can all go away readily, yes.
>
> --S
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From apt.shansen at gmail.com  Mon Feb  2 02:50:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:50:36 -0800
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <4986A1B1.9070805@arimaz.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
	<4986A1B1.9070805@arimaz.com>
Message-ID: <7a9c25c20902012350r37502a5by99a631ad3d7f686c@mail.gmail.com>

> Well, isn't tkinter being removed?
> (http://www.python.org/dev/peps/pep-3108/)

PEP3108 isn't only about removals, but some renaming and
reorganizations of certain packages / modules to be consistent within
the standard library. In that section of PEP3108 they're talking about
grouping tkinter modules together in a different way.

That said...

> So the user will have to install it anyways, I think wx is way better that
> tkinter
> from a user and a developer's perspective. I think it's time to let it
> go....but hey,

Honestly, I agree. There's a point to a meta-app like this being
"universally available" and since Tkinter is almost always available,
that's a boon. But Tkinter is a really, really poor choice in just
about every other category of how you make your decision IMHO.

If the OP wants to use a wxPython-based GUI, all power to him. If he
wants his utility to get wide adoption he just needs to make sure he
can get some binary installers; deps, rpms, windows .exe's, etc.
That's not at all impossible to do. Just takes extra work. If he wants
to do the work -- and have a good UI -- good for him.

--S


From berserker992 at gmail.com  Mon Feb  2 02:51:22 2009
From: berserker992 at gmail.com (berserker992 at gmail.com)
Date: Sun, 1 Feb 2009 23:51:22 -0800 (PST)
Subject: Problem With py2exe and ConfigParser
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
	<6um1i1FfqskrU1@mid.uni-berlin.de>
Message-ID: <7fad9e49-df2e-46db-a3cc-6e5b9f55e773@q36g2000vbn.googlegroups.com>


You can set an example? My English is bad, so I do not quite
understand


> > Hello, i use python 2.6 + PyQt4.
> > I compile my main.pyw. It is compile, but don't run. In
> > "index.exe.log" error log:
>
> >>>> ?File "index.pyw", line 100, in GetVal
> >>>> ConfigParser.NoSectionError: No section: 'Main'
>
> >>>> Code line 92 to 104 this is class that uses ConfigParser lib:
> >>>> class ConfigAcces:
> >>>> ? ?def __init__(self):
> >>>> ? ? ? ?self.cnf = ConfigParser()
> >>>> ? ?def GetLibUrl(self):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?return self.cnf.get("Main","lib_path")
> >>>> ? ?def GetVal(self, p, key):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?return self.cnf.get(p,key)
> >>>> ? ?def SetVal(self, selection, option, NewVal):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?self.cnf.set(selection,option,NewVal)
> >>>> ? ? ? ?self.cnf.write(open("config.ini", "w"))
>
> > how do I fix this?
>
> By passing the right path for the configuration file? It's obviously not
> found.
>
> Diez



From jwalana at vsnl.net  Mon Feb  2 02:52:51 2009
From: jwalana at vsnl.net (jwalana at vsnl.net)
Date: Mon, 02 Feb 2009 12:52:51 +0500
Subject: Exception error when accessing the class variable at the termination
	of the program
Message-ID: <e244ddfd13312.4986eca3@vsnl.net>

Hi All,

   Here is a sample piece of code with which I am having a problem, with Python version 2.4.4

class Person:
    Count = 0   # This represents the count of objects of this class

    def __init__(self, name):
        self.name = name
        print name, ' is now created'
        Person.Count += 1

    def __del__(self):
        print self.name, ' is now deleted'
        Person.Count -= 1
        if Person.Count == 0:
            print 'The last object of Person class is now deleted'
        else:
            print 'There are still', Person.Count, ' objects of class Person'

x2 = Person("Krishna")
del x2

  When the above code is executed, it works properly.

  If the last statement del x2, is removed, then when the program terminates, this throws up an exception as shown below

Krishna  is now created
Krishna  is now deleted
Exception exceptions.AttributeError: "'NoneType' object has no attribute 'Count'
" in <bound method Person.__del__ of <__main__.Person instance at 0xf6532f6c>> ignored

 Can someone please explain why the exception happens in the case where there is no explicit del statement?

Thanks
Jana



From mail at microcorp.co.za  Mon Feb  2 02:53:50 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 09:53:50 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
Message-ID: <018801c9850e$3e019fe0$0d00a8c0@hendrik>

<rd.....murray at bitdance.com> wrote:

> 
> You, sir, should be programming in some language other than Python.

Why?  - Python is object oriented, but I can write whole systems
without defining a single class.
By analogy, if data hiding is added to language, I could write a 
whole system without hiding a single item.
Conversely, the lack of data hiding is perceived as a weakness,
and IMO harms the advocacy of the language - This is proven
by your statement above, whereby you are driving a user away,
simply because the language, in one small aspect, does not
give him what he wants, and the tenor of this thread has been
very much: "That's how it is - like it or lump it", and no amount
of careful explanation of why people want the feature has cut 
any ice - It has all the time been countered with statements
about how the proponents of private attributes "don't need it",
(as if they are plain dumb), that an underscore convention is 
"just as good", (It isn't), that you could crack it if you really 
tried, (so what?), and other more specious reasons.

This is IMO an arrogant attitude - 

Surely if "we are all adults here" we have to accept that the 
other man has as much right to get what he wants, as 
anybody else, and that his reasons are as valid as those of 
anybody else.

Somehow I don't think that the way this thread has run, is
the way to "win friends and influence people"  - not 
positively, anyway.

- Hendrik




From mail at microcorp.co.za  Mon Feb  2 02:57:23 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 09:57:23 +0200
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Addressalready in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik><49855129.9070901@shopzeus.com>
	<gm46aj$ucc$1@ger.gmane.org>
Message-ID: <018901c9850e$3eba4180$0d00a8c0@hendrik>


"Steve Holden" <st. at hol.eb.com> wrote:

> 
> My previous reply assumed you are running some UNIX-like operating
> system. If you are on Windows then Jean-Paul's advice stands, as Windows
> *does* allow several processes to listen on the same port and randomly
> delivers incoming connections to one of the listening processes.
> 
> I believe this is because Microsoft failed to understand the original
> meaning of SO_REUSEADDR for their early TCP implementations, and
> persisted with this ghastly error in the name of backwards
> compatibility, justifying it by suggesting that listener pools could be
> created. Or some such nonsense. Perhaps someone with more insight into
> the development process could comment. It seems to me it's completely
> bizarre.
> 
> However, under Windows 2000 and later you should find there's an
> SO_EXCLUSIVEADDRUSE flag which you can use to ensure a single listener -
> see http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx. No
> need for separate locks.
> 

Thanks Steve - I am not the OP, I was just curious as to why
Jean-Paul was saying what he did - so the only reason I have 
not been bitten on windoze yet must be either because I am 
lucky, or because my server side stuff is linux and there is the 
occasional windows client.  So I don't really listen on windows.

"a pool of listeners" - just think of the fun one can have trying to
keep state between them - would be a marvellous job if someone
else is paying top dollar by the hour - I can just see the team growing
as the need for new specialists are discovered as one goes along.

:-)

- Hendrik




From apt.shansen at gmail.com  Mon Feb  2 02:58:25 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:58:25 -0800
Subject: Import without executing module
In-Reply-To: <79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
Message-ID: <7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:43 PM, Taskinoor Hasan
<taskinoor.hasan at csebuet.org> wrote:
> Can anyone explain what is the necessity of executing whole script when
> importing. Isn't it enough to just put the module name in the namespace and
> execute when some function is called?

I'm not sure if I'm going to explain this right-- so bear with me.

The code:

    def something(other):
        return other + 1

Doesn't exist until that def statement is executed. "def", "class" and
such are not magical and immediately register something somewhere. Its
a statement that has to be executed to get a result, and that result
is bound as an assignment to the name specified.

Its not really all that different from:
    something = lambda other: other + 1

It can't pick through the top level instructions to determine what to
execute if imported vs run, as every statement has the possibility of
producing some binding of name to value and until you go and execute
it you won't know. You may do something like:

    try:
        import blah
    except:
        blah = None

You have to execute all of that to get a value for 'blah'. In Python,
there's nothing really special about a function vs any other value.
They are all objects that are assigned to a name in a given namespace.
You can do dynamic things at the top level to result in different
things being bound to the modules namespace based upon the statements
and expressions evaluated.

Does that make sense? If not someone else'll have to explain :)

--Stephen


From apt.shansen at gmail.com  Mon Feb  2 03:23:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:23:55 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <87myd51ouw.fsf@benfinney.id.au>
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
	<mailman.8560.1233544309.3487.python-list@python.org>
	<87myd51ouw.fsf@benfinney.id.au>
Message-ID: <7a9c25c20902020023kdb4e97eh16137c078fd64a8@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney
<bignose+hates-spam at benfinney.id.au> wrote:
> rdmurray at bitdance.com writes:
>
>> I don't even see Stephen Hansen's posts. My newsreader just shows
>> the header and says "[HTML part not displayed]".
>
> Likewise.

Yeah, I know HTML is bad on newsgroups. I didn't realize that when I
installed FireGPG to sign messages while in Gmail that it started
handling my html/plain text content differently.

Oops.

That said: Is S/MIME / OpenPGP readable on these various clients?
There's no HTML, the text body is just encoded in base64.

I haven't actually subscribed to a usenet newsgroup in eons upon eons.

If its not readable as S/MIME then I'll switch to inline PGP... that's
just a slightly terrible solution for other places I have to talk and
I'll have to take extra care to remember to manually check the
settings based upon where I'm talking.

I'm re-sending this same message as the OpenPGP S/MIME attachment
format -- just so test if its actually readable by news clients in
general. I have absolutely no idea. Not touched a news client in years
and years, as I said.

Sorry for the inconvenience.

--Stephen


From apt.shansen at gmail.com  Mon Feb  2 03:24:19 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:24:19 -0800 (PST)
Subject: Membership of multiple items to a list
In-Reply-To: <87myd51ouw.fsf@benfinney.id.au>
Message-ID: <fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney <bignose+hates-spam at benfinney.id.au> wrote:
> rdmurray at bitdance.com writes:
>
>> I don't even see Stephen Hansen's posts. My newsreader just shows
>> the header and says "[HTML part not displayed]".
>
> Likewise.

Yeah, I know HTML is bad on newsgroups. I didn't realize that when I installed FireGPG to sign messages while in Gmail that it started handling my html/plain text content differently.

Oops.

That said: Is S/MIME / OpenPGP readable on these various clients? There's no HTML, the text body is just encoded in base64.

I haven't actually subscribed to a usenet newsgroup in eons upon eons. 

If its not readable as S/MIME then I'll switch to inline PGP... that's just a slightly terrible solution for other places I have to talk and I'll have to take extra care to remember to manually check the settings based upon where I'm talking.

I'm re-sending this same message as the OpenPGP S/MIME attachment format -- just so test if its actually readable by news clients in general. I have absolutely no idea. Not touched a news client in years and years, as I said.

Sorry for the inconvenience. 

--Stephen
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From nospam at nospam.com  Mon Feb  2 03:29:24 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 02 Feb 2009 09:29:24 +0100
Subject: [2.5.1] Comparing dates?
Message-ID: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>

Hello

	I have data in an SQL database where one column contains a date
formated as DD/MM/YYYYY.

I need to select all rows where the date is before, say Feb 1st 2009,
ie. 01/02/2009.

Is there a command in Python that does this easily, or should I look
into whatever date() function the SQL database offers?

Thank you.


From taskinoor.hasan at csebuet.org  Mon Feb  2 03:42:34 2009
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 2 Feb 2009 14:42:34 +0600
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
	<7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
Message-ID: <79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>

On Mon, Feb 2, 2009 at 1:58 PM, Stephen Hansen <apt.shansen at gmail.com>wrote:

> On Sun, Feb 1, 2009 at 11:43 PM, Taskinoor Hasan
> <taskinoor.hasan at csebuet.org> wrote:
> > Can anyone explain what is the necessity of executing whole script when
> > importing. Isn't it enough to just put the module name in the namespace
> and
> > execute when some function is called?
>
> I'm not sure if I'm going to explain this right-- so bear with me.
>
> The code:
>
>    def something(other):
>        return other + 1
>
> Doesn't exist until that def statement is executed. "def", "class" and
> such are not magical and immediately register something somewhere. Its
> a statement that has to be executed to get a result, and that result
> is bound as an assignment to the name specified.
>
> Its not really all that different from:
>    something = lambda other: other + 1
>
> It can't pick through the top level instructions to determine what to
> execute if imported vs run, as every statement has the possibility of
> producing some binding of name to value and until you go and execute
> it you won't know. You may do something like:
>
>    try:
>        import blah
>    except:
>        blah = None
>
> You have to execute all of that to get a value for 'blah'. In Python,
> there's nothing really special about a function vs any other value.
> They are all objects that are assigned to a name in a given namespace.
> You can do dynamic things at the top level to result in different
> things being bound to the modules namespace based upon the statements
> and expressions evaluated.
>
> Does that make sense? If not someone else'll have to explain :)


It make sense :-).  So my reasoning......let A is imported in B, i.e. name A
is put in B's namespace. When we call something like A.a then the
interpreter first resolve A in B's namespace, then to get a, it need to look
up A's namespace. And there is no way to populate A's namespace without
executing A, and as all statements, including 'def', 'class' etc., are
treated in the same way, whole script need to be executed.

So whether a script can be imported as module or not is mainly dependent on
how the script is written and largely on the intention of the coder.

>
>
> --Stephen
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From raykyoto at gmail.com  Mon Feb  2 03:53:54 2009
From: raykyoto at gmail.com (Ray)
Date: Mon, 2 Feb 2009 00:53:54 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<mailman.8573.1233560219.3487.python-list@python.org>
Message-ID: <0b9638e5-3e23-42c1-b358-0037944abe5b@s1g2000prg.googlegroups.com>


Hi Stephen and everyone,


On Feb 2, 4:36?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > Maybe he can wrap the things he dont need inside
> > if __name__ == '__main__':
> > check.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Yeah but he said he doesn't want to modify the file itself-- if he can
> modify the file this can all go away readily, yes.


Thank you for your posts and your explanations; and yes, as you
(Stephen) said here, I'd prefer not to modify it and use it as-is.
Ideally, the original author could have separated the functions from
the top-level code and I would just import the module with the
functions.  But that's whining since the hard work of writing the
functions was already done and I'm very grateful for it; likewise, I'd
like to use of the module unchanged.

As there is no way around it, I'll look into ways of minimizing the
number of changes and the "if" statement mentioned by Kottiyath would
be my next step.  Thank you all for the replies!

Ray




From apt.shansen at gmail.com  Mon Feb  2 03:55:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:55:36 -0800
Subject: is python Object oriented??
In-Reply-To: <018801c9850e$3e019fe0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
Message-ID: <7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>

>>
>> You, sir, should be programming in some language other than Python.
>
> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a
> whole system without hiding a single item.
> Conversely, the lack of data hiding is perceived as a weakness,
> and IMO harms the advocacy of the language -

This is an alarming statement.

Advocacy should advocate the language-- it must not define the language.

If a fundamental principle of the language harms the advocacy of the
language: then the problem is not with the language but the advocacy.
If you are going to advocate a thing: advocate that thing. Don't try
to change that thing into what it is not so as to make your advocacy
the end-goal.

One of the reasons I love Python is because its practical first. It
begins with its license, which some people argue allows companies to
steal effort from its developers to use for their own purposes without
contributing back. The Python license is about empowering people to
accomplish things, to do things. It goes further. Guido and the core
developers ask real questions: would this add a burden to practical
use, or would it hinder another practical use?


> This is proven
> by your statement above, whereby you are driving a user away,
> simply because the language, in one small aspect, does not
> give him what he wants, and the tenor of this thread has been
> very much: "That's how it is - like it or lump it", and no amount
> of careful explanation of why people want the feature has cut
> any ice -

I'm missing the careful explanation. What I've heard is that the lack
of enforced encapsulation is "a danger". What I've heard is that
people want it because they've been told they should want it and
believe that. Why?

Part of my lack of understanding might be because people couldn't read
my previous messages because my mail client's configuration
accidentally got fubar'd and I was sending HTML mail instead of plain
text. But my question remains: Why do you need forced encapsulation?

There have been no "careful explanations" to answer that, in my mind.
And thus my response is: the practical possibility of needing access
vastly outweights the theoretical situation that might go bad if
encapsulation wasn't there. Why? Because in any real situation, IMHO,
*forced* encapsulation is pointless.

If you are writing end-level code, you can achieve forced
encapsulation by simply not playing with anyones privates. If you are
in a corporate environment who has rules about accessing privates
written by another team for valid reasons, your policy to not do so
should be enough or your review process should pick it up. If you are
in an open source environment accepting patches from various people,
you should have a clear policy about the subject if you think breaking
encapsulation is never acceptable and refuse the patches. Those who
have commit access and violate encapsulation anyways against your
projects policy are problems that you clearly need to deal with. The
problem is not the language at that point, its the contributor.


> It has all the time been countered with statements
> about how the proponents of private attributes "don't need it",
> (as if they are plain dumb),

They don't need it. No one has shown a *real* reason why. The only
reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
That's not a real reason. If its your project that someone is doing
bad in, this is a situation which can be *clearly* specified in a
projects policy and coding standards and can be *trivially* tested for
with simple static analysis in nearly all cases. The problem is the
person and not the code then. There's *countless* other ways that
person can do bad if you're allowing them to commit blindly anything
into your project.

If its your projet which someone else is using, and accessing your
internals that are clearly private and not documented: its not your
problem if they stab themselves in the foot. On the contrary, why in
the name of all that is holy, do you care if they manipulate your
internals at their own risk, at their own cost, and achieve something
positive for them? How in any way does this hurt you?


>  that an underscore convention is
> "just as good", (It isn't),

Why isn't it?

> that you could crack it if you really
> tried, (so what?),

Exactly.. so what? WHY is the convention not enough? What REAL
situation is there that the lack of *forced* encapsulation but policy
based encapsulation not enough?

> Surely if "we are all adults here" we have to accept that the
> other man has as much right to get what he wants, as
> anybody else, and that his reasons are as valid as those of
> anybody else.

Yes., We're all consenting adults.

But if one adult decides to make rules that the other doesn't agree
to, is that consenting adults, or is that rape? I apologize for the
use of the term, but "consenting adults" has particular connotations
that seem to apply very well here, in the context of that expression.

Forced encapsulation allows one party to make absolute rules and hold
absolute authority over another party.

If you believe that encapsulation should never be broken: do not break it.

If your organization, corporation or project believes that
encapsulation should never be broken: specify that it must not be
done. Your review process (you do have one, right?) will pick it up
and you can very quickly deal with the situation.

Encapsulation is a very, very good thing in general: but it is a
question of *design* and not *implementation*.  Python allows EVERYONE
who wants encapsulation to HAVE it. Not forced encapsulation, but
encapsulation. If you're producing a product in Python on your own
simple policy and trivial review (even -automated- review; it is NOT
hard to tell that "other._private" is not "self._private") provides
encapsulation.  If you're making a library for others to use, there is
no valid reason for you to care if they screw with your internals.

Really. I just don't get the problem. It seems to me that people who
want this in Python will never be happy *in* Python. Its a very deep
fundamental feature that Python exposes everything it can, even things
that are potentially dangerous like sys._getframe. Recently on
Python-dev(note: I only lurk) someone was working on a debugger and
they were told in that situation it was OK to access a private member
of sys to achieve an end: exposing that internal to general use just
had no value. That's the Python Way. People can dig into things,
classes, functions, and screw around in wild ways if they want to.
That *is* what Python is. 95% of code by 95% of people won't ever go
there, but its there. To remove it means its *not* Python.

--S


From rNOSPAMon at flownet.com  Mon Feb  2 03:59:16 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Mon, 02 Feb 2009 00:59:16 -0800
Subject: Extreme Yaro weirdness
Message-ID: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>

I'm running the following WSGI app under Yaro:

def error(req):
  try:
    req.non_existent_key
  except:
    try:
      return cgitb.html(sys.exc_info())
    except:
      return 'foo'

The result of running this is 'foo'.  In other words, the reference to 
the non-existent key generates an exception as expected, but then the 
generation of the traceback generates ANOTHER exception, which I would 
not have expected.  If I add another TRY/EXCEPT block to capture this 
exception, the result is attached at the bottom of this message.

It gets better.

I get the same result whether I run under Apache/mod_wsgi or standalone 
using wsgi_ref.  But if I add the following code to try to capture a 
Yaro request object so I can noodle around with it:


def error(req):
  global req1
  req1=req
  try: ...


it makes the problem go away!  But it ONLY makes the problem go away 
when running under wsgi_ref, not under Apache!

The problem seems to be specific to Yaro.  If I make an instance of an 
object and try to dereference a non-existent attribute, the initial 
traceback gets generated with no problem.  Also, the Yaro code for 
Request.__getattr__ ultimately calls req.__dict__[attr].  If I make this 
call directly, the problem also goes away.

I am quite baffled by this.  Any suggestions on how to debug this would 
be much appreciated.

Thanks,
rg


----


<type 'exceptions.KeyError'>
Python 2.5: /usr/local/bin/python
Mon Feb  2 00:54:33 2009

A problem occurred in a Python script.  Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /www/sites/mcia.cc/files/wsgi/test.wsgi in error(req=<yaro.Request 
object at 0x2aaaab94a690>)
  212   except:
  213     try:
  214       return cgitb.text(sys.exc_info())
  215     except:
  216       try:
global cgitb = <module 'cgitb' from '/usr/lib/python2.5/cgitb.pyc'>
cgitb.text = <function text at 0x2aaaab0adc80>
global sys = <module 'sys' (built-in)>
sys.exc_info = <built-in function exc_info>

 /www/sites/cgitb.py in text((etype=<type 'exceptions.KeyError'>, 
evalue=KeyError('non_existent_key',), etb=<traceback object at 
0x2aaaab960368>), context=5)
  215             try: return linecache.getline(file, lnum[0])
  216             finally: lnum[0] += 1
  217         vars = scanvars(reader, frame, locals)
  218 
  219         rows = [' %s %s' % (file, call)]
builtinvars = <built-in function vars>
global scanvars = <function scanvars at 0x2aaaab0adb90>
reader = <function reader at 0x2aaaabbbea28>
frame = <frame object at 0xba49e0>
locals = {'req': <yaro.Request object at 0x2aaaab94a690>}

 /www/sites/cgitb.py in scanvars(reader=<function reader at 
0x2aaaabbbea28>, frame=<frame object at 0xba49e0>, locals={'req': 
<yaro.Request object at 0x2aaaab94a690>})
   82             if lasttoken == '.':
   83                 if parent is not __UNDEF__:
   84                     value = getattr(parent, token, __UNDEF__)
   85                     vars.append((prefix + token, prefix, value))
   86             else:
value = <yaro.Request object at 0x2aaaab94a690>
builtingetattr = <built-in function getattr>
parent = <yaro.Request object at 0x2aaaab94a690>
token = 'non_existent_key'
__UNDEF__ undefined

 /www/sites/mcia.cc/files/wsgi/yaro.py in __getattr__(self=<yaro.Request 
object at 0x2aaaab94a690>, attr='non_existent_key')
  215         elif attr == 'cookie' and not 'cookie' in self.__dict__:
  216             self._load_cookie()
  217         return self.__dict__[attr]
  218 
  219     def _parse_query(self):
self = <yaro.Request object at 0x2aaaab94a690>
self.__dict__ = {'_start_response': <built-in method start_response of 
mod_wsgi.Adapter object at 0x2aaaaab218a0>, 'content_length': '', 
'content_type': '', 'environ': {'DOCUMENT_ROOT': 
'/www/sites/mcia.cc/html', 'GATEWAY_INTERFACE': 'CGI/1.1', 
'HTTP_ACCEPT': 
'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plai
n;q=0.8,image/png,*/*;q=0.5', 'HTTP_ACCEPT_ENCODING': 'gzip, deflate', 
'HTTP_ACCEPT_LANGUAGE': 'en-us', 'HTTP_CACHE_CONTROL': 'max-age=0', 
'HTTP_CONNECTION': 'keep-alive', 'HTTP_COOKIE': 'sid=55UGS64T', 
'HTTP_HOST': 'mcia.cc', 'HTTP_REFERER': 'http://mcia.cc/wtest/menu', 
...}, 'exc_info': None, 'extra_props': None, 'method': 'GET', 'query': 
{}, 'res': <yaro.Response object at 0x2aaaab94a710>, 
'start_response_called': False, ...}
attr = 'non_existent_key'
<type 'exceptions.KeyError'>: 'non_existent_key'

The above is a description of an error in a Python program.  Here is
the original traceback:

Traceback (most recent call last):
  File "/www/sites/mcia.cc/files/wsgi/test.wsgi", line 214, in error
    return cgitb.text(sys.exc_info())
  File "cgitb.py", line 217, in text
    vars = scanvars(reader, frame, locals)
  File "cgitb.py", line 84, in scanvars
    value = getattr(parent, token, __UNDEF__)
  File "/www/sites/mcia.cc/files/wsgi/yaro.py", line 217, in __getattr__
    return self.__dict__[attr]
KeyError: 'non_existent_key'


From pranny at gmail.com  Mon Feb  2 04:05:59 2009
From: pranny at gmail.com (pranav)
Date: Mon, 2 Feb 2009 01:05:59 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
Message-ID: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>

Hi Folks,

I am designing a project for Windows XP/Vista, one part of which is a
background process that monitors internet connections. If the user
tries to connect to any particular site, say myDummySite.com in then
some actions are taken, based on fixed policies.
This can be thought of a mini firewall.

I am sure there must be some good libraries for this purpose. I need
the names of those libraries.

Thanks,

Pranav Prakash


From bignose+hates-spam at benfinney.id.au  Mon Feb  2 04:06:02 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 20:06:02 +1100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
Message-ID: <87bptl1a4l.fsf@benfinney.id.au>

Gilles Ganault <nospam at nospam.com> writes:

> 	I have data in an SQL database where one column contains a
> date formated as DD/MM/YYYYY.
> 
> I need to select all rows where the date is before, say Feb 1st
> 2009, ie. 01/02/2009.

The Python data types for date and time are in the ?datetime? module
<URL:http://www.python.org/doc/2.6/library/datetime>. Create a
?datetime? object for each value you want, then compare them.

To create a ?datetime? value from a string, use ?datetime.strptime?
(new in Python 2.5).

-- 
 \                            ?Holy knit one purl two, Batman!? ?Robin |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From sjmachin at lexicon.net  Mon Feb  2 04:17:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 01:17:32 -0800 (PST)
Subject: Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
Message-ID: <712e7c7b-4728-4e43-acad-bd80e9598dae@z27g2000prd.googlegroups.com>

On Feb 2, 7:29?pm, Gilles Ganault <nos... at nospam.com> wrote:
> Hello
>
> ? ? ? ? I have data in an SQL database where one column contains a date
> formated as DD/MM/YYYYY.
>
> I need to select all rows where the date is before, say Feb 1st 2009,
> ie. 01/02/2009.
>
> Is there a command in Python that does this easily, or should I look
> into whatever date() function the SQL database offers?

It would help if you told us:
(1) Which database software
(2) What type that column was declared to be in the CREATE TABLE
statement
(3) Whether you have used the Python DB API on a database before
(4) Whether you have used a stand-alone SQL query tool on a database
before
(5) How you came to the conclusion that one column contains a date
formatted as dd/mm/yyyy ... Only one? Are there other date-containing
columns in the same table or other tables in the database? If so, how
are they formatted?

Basically, you are going to have to execute some SQL like:
   SELECT * FROM the_table WHERE the_date  < '2009-02-01'
which a reasonable chance of being syntactically valid and giving the
correct answer, if the column type is DATETIME/DATE/TIMESTAMP/similar.
If it's CHAR/VARCHAR/TEXT/CHARACTER/similar, then it's going to be
harder, and will depend on what database software it is.

A really silly question: have you asked the database administrator
(DBA)?


From adelle at akemi.com.au  Mon Feb  2 04:25:41 2009
From: adelle at akemi.com.au (Adelle Hartley)
Date: Mon, 02 Feb 2009 20:25:41 +1100
Subject: English-like Python
In-Reply-To: <49773E43.3050101@strout.net>
References: <1232067775.15931.25.camel@localhost>	<mailman.7483.1232288138.3487.python-list@python.org>	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>	<49761EE6.4070306@strout.net>
	<gl62md$hbg$1@ger.gmane.org>	<mailman.7651.1232507792.3487.python-list@python.org>	<5ea322bb-86f9-4b5c-94ec-e53e2f7cf193@r15g2000prh.googlegroups.com>
	<49773E43.3050101@strout.net>
Message-ID: <4986BC15.6030703@akemi.com.au>

Joe Strout wrote:
 > Aaron Brady wrote:
 >
 >> Where functions are first-class objects, a bare function object isn't
 >> distinguishable either from its call.
 >
 > That depends not on whether functions are first-class objects, but on
 > the *syntax* of function invocation vs. function reference.  It just so
 > happens than in Python, the syntax for the latter is the bare function
 > identifier.  But it wouldn't have to be -- you could use "@foo" or
 > "{foo}" or "ref foo" or (as in RB) "AddressOf foo" or any number of
 > other alternatives to accomplish the same thing, and functions would
 > still be first-class objects.
 >
 > I'll grant that having any such syntax makes them *odd* first-class
 > objects, since all other objects are referred to with a naked
 > identifier, and invoked (if they are callable) with some other syntax.
 > It'd be weird and inconsistent to have functions turn that around.  But,
 > despite being inconsistent, it might still be sensible, based on the
 > observation that we generally need to invoke methods a lot more often
 > than we need to get a reference to them.

I propose the following syntax for invoking foo:

Computer, please foo that for me.

I know Jean Luc would just say "Computer, foo that" but I think that 
just because it's a computer doesn't mean we shouldn't be polite.

I have found English-like syntax to be useful in filtering sets.

Eg.

   parents = people.that.have.children

This looks nicer (at least to my eye) in languages that don't require 
parentheses everywhere, but that's entirely superficial.

One way that I've thought it might be possible to avoid the problem of 
ambiguity in identifying parameters is to not use them.

For example, instead of

   display(people.that.have.children)

why not

   display.people.that.have.children

or even

   display.a.list.of.people.that.have.children

I think this could only work within a confined domain, since "display" 
needs to know about all of the things that could be displayed.

Regarding ambiguities.  The way NL users resolve them is often to ask 
their interlocutor for clarification.  The problem for a program is that 
the programmer isn't around to answer questions when the answer is 
needed most - the problem of programming is in defining the desired 
behavior ahead of time.

If we are ever to use English as a programming language, I think the 
"compiler" would need to ask us clarifying questions at compile time and 
amend or annotate the source based on our answers.

The resulting source code may be a rarefied version of English or more 
like a "traditional" programming language, but our primary means of 
communicating with the computer could be more natural.

Back in the 90's I used to say things to my computer like

   Computer, please Label this command button "Parents".

I don't think it much of a stretch to have it respond to

   When the user clicks this button, bring up a list of all the people 
that have children.

by generating the code

   display.a.list.of.people.that.have.children

and to attach it to the right event.

But even that level of apparent naturalness belies a problem that other 
posters in this thread have already raised:  There are so many ways of 
saying the same thing, yet the computer will only ever understand a 
subset of them, making it harder to learn the "natural" system than any 
artificial programming language.

I had at one time defined a number of voice commands for designing a form:

   Place a <control> here.
   Place a <control> <to the left of|to the right of|above|below> <this 
control|<control name> >
   Move that <up|down|left|right> <number pixels|a bit|slightly>
   ...

Once I "got into it" I was pretty productive with it, but the experience 
is not unlike playing with text-based adventure games for the first time.

That is, you know what you want the program to do, but you either don't 
know how to say it in a way that the program will understand or you know 
the program well enough to know that there is no way of directly 
representing what you want to do within the program's narrow grasp of 
English.

I don't think the problem is fundamentally unsolvable, only that the 
scale of the problem is quite large, like writing a dictionary.

Adelle.





From s.selvamsiva at gmail.com  Mon Feb  2 04:29:27 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 2 Feb 2009 14:59:27 +0530
Subject: importing module-performance
Message-ID: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>

Hi all,
I have a small query,
Consider there is a task A which i want to perform.

To perform it ,i have two option.
1)Writing a small piece of code(approx. 50 lines) as efficient as possible.
2)import a suitable module to perform task A.


I am eager to know,which method will produce best performance?
-- 
Yours,
S.Selvam
-------------- next part --------------
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From clp2 at rebertia.com  Mon Feb  2 04:37:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 01:37:08 -0800
Subject: Exception error when accessing the class variable at the 
	termination of the program
In-Reply-To: <e244ddfd13312.4986eca3@vsnl.net>
References: <e244ddfd13312.4986eca3@vsnl.net>
Message-ID: <50697b2c0902020137h7afabb1bt56dbea34a8db6246@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:52 PM,  <jwalana at vsnl.net> wrote:
> Hi All,
>
>   Here is a sample piece of code with which I am having a problem, with Python version 2.4.4
>
> class Person:
>    Count = 0   # This represents the count of objects of this class
>
>    def __init__(self, name):
>        self.name = name
>        print name, ' is now created'
>        Person.Count += 1
>
>    def __del__(self):
>        print self.name, ' is now deleted'
>        Person.Count -= 1
>        if Person.Count == 0:
>            print 'The last object of Person class is now deleted'
>        else:
>            print 'There are still', Person.Count, ' objects of class Person'
>
> x2 = Person("Krishna")
> del x2
>
>  When the above code is executed, it works properly.
>
>  If the last statement del x2, is removed, then when the program terminates, this throws up an exception as shown below
>
> Krishna  is now created
> Krishna  is now deleted
> Exception exceptions.AttributeError: "'NoneType' object has no attribute 'Count'
> " in <bound method Person.__del__ of <__main__.Person instance at 0xf6532f6c>> ignored
>
>  Can someone please explain why the exception happens in the case where there is no explicit del statement?

Without the `del`, the reference count of x2 remains >0 and so is not
deleted until the program ends. This affects when __del__ is executed,
which matters greatly.

>From the section on __del__ on
http://www.python.org/doc/2.3.5/ref/customization.html :
Warning: Due to the precarious circumstances under which __del__()
methods are invoked, exceptions that occur during their execution are
ignored, and a warning is printed to sys.stderr instead. Also, when
__del__() is invoked in response to a module being deleted (e.g., when
execution of the program is done), ***other globals referenced by the
__del__() method may already have been deleted***. For this reason,
__del__() methods should do the absolute minimum needed to maintain
external invariants. [etc., emphasis mine]

Since without the `del`, __del__ is only called at the end of the
program, Person and/or Count may have already been GC-ed by the time
__del__ is called (the order objects are GC-ed in is a bit
unpredictable), hence the error you get which is saying, in a slightly
obtuse way, that Person has been GC-ed already.
As the Warning states, __del__ shouldn't be relied upon to do fancy
stuff like you're having it do. You would be better off using an
explicit finalizer method in this case, like .close() for file
objects.

For example:

try:
    x2 = Person("Krishna")
    #do stuff with x2
finally:
    x2.delete() #causes count to be decremented

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From duncan.booth at invalid.invalid  Mon Feb  2 04:37:21 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 2 Feb 2009 09:37:21 GMT
Subject: Exception error when accessing the class variable at the
	termination of the program
References: <mailman.8585.1233565087.3487.python-list@python.org>
Message-ID: <Xns9BA661D12A12Dduncanbooth@127.0.0.1>

jwalana at vsnl.net wrote:

>  Can someone please explain why the exception happens in the case
>  where there is no explicit del statement? 

When Python is ecleaning up as it exits, it clears all the global 
variables in each module by setting them to None. This happens in an 
arbitrary and unpredictable order: in this particular case it set Person 
to None before setting x2 to None.

If you must have a __del__ method on a class then you should take care 
not to access any globals from inside the __del__ method (or any 
function it calls). Alternatively you could just catch and ignore any 
exceptions thrown from your __del__ method.

In the example you gave, provided you never subclass Person you could 
use self.__class__.Count to access your class variable. However in many 
cases you'll probably find that a much better solution is to use weak 
references. e.g. a WeakValueDictionary mapping id(self) to self:

from weakref import WeakValueDictionary

class Person:
    _instances = WeakValueDictionary()

    def __init__(self, name):
        self.name = name
        self._instances[id(self)] = self
        print name, 'is now created'

    @property
    def Count(self):
        return len(self._instances)

    def __del__(self):
        print self.name, 'is now deleted'
        if self.Count==0:
            print 'The last object of Person class is now deleted'
        else:
            print 'There are still', self.Count, 'objects of class 
Person'

x2 = Person('Krishna')
# del x2


-- 
Duncan Booth http://kupuguy.blogspot.com


From clp2 at rebertia.com  Mon Feb  2 04:41:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 01:41:45 -0800
Subject: importing module-performance
In-Reply-To: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
References: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
Message-ID: <50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>

On Mon, Feb 2, 2009 at 1:29 AM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
> I have a small query,
> Consider there is a task A which i want to perform.
>
> To perform it ,i have two option.
> 1)Writing a small piece of code(approx. 50 lines) as efficient as possible.
> 2)import a suitable module to perform task A.
>
>
> I am eager to know,which method will produce best performance?

A. Your question seems much too vague to answer.
B. Premature optimization is the root of all evil. In all likelihood,
the time taken by the `import` will be absolutely trivial compared to
the rest of the script, so don't bother micro-optimizing ahead of
time; write readable code first, then worry about optimization once
it's working perfectly.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From banaouas.medialog at wanadoo.fr  Mon Feb  2 04:46:41 2009
From: banaouas.medialog at wanadoo.fr (m.banaouas)
Date: Mon, 02 Feb 2009 10:46:41 +0100
Subject: ElementTree and clone element toot
Message-ID: <4986bfd7$0$9385$ba4acef3@news.orange.fr>

Hi all,
Working with the ElementTree module, I looked for clone element function but not
found such tool:

def CloneElment(fromElem, destRoot = None)
fromElem is the element to clone
destRoot is the parent element of the new element ; if None so the new element
will be child of fromElem parent. The clone operation is recursive to make it
process all subtree of the element to clone.

here is my first implementation:

def CloneElement(fromElem, destRoot = None):
  if destRoot == None:
    fromRoot = ET.ElementTree(fromElem).getroot()
    destRoot = fromRoot
  destElem = destRoot.makeelement(fromElem.tag, fromElem.attrib)
  destRoot.append(destElem)
  destElem.text = fromElem.text
  for e in fromElem.findall('*'):
    CloneElement(e, destElem)
#
this function works fine only if destRoot parameter is defined by the caller
context. The problem is about retreiving parent element: I didn't found any way
to determine the parent element of an element "elem" by asking elem itself!
and ET.ElementTree(fromElem).getroot() is wrong because it returns fromElem
itself, not its parent.

Thanks for any help.


From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 04:59:59 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 10:59:59 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8486.1233440218.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<mailman.8269.1233224761.3487.python-list@python.org>	<mn.eb167d9187521ecb.46195@XX.XmclaveauX.com>	<873af1vkgn.fsf@benfinney.id.au>	<mn.fada7d9198c350e2.46195@XX.XmclaveauX.com>	<gm1ibs$994$1@ger.gmane.org>
	<mailman.8486.1233440218.3487.python-list@python.org>
Message-ID: <4986c41f$0$3659$426a34cc@news.free.fr>

Michael Torrie a ?crit :
> Steve Holden wrote:
>> You can think what you like, but there is a fundamental difference
>> between methods of a class and functions of a module. Until you
>> appreciate that you will likely make mistakes. Don't worry, though, we
>> all learn from our mistakes.
> 
> And this fundamental difference is?

That a method is bound to a class and (usually) an instance of this class.

> From what I can tell an instance method is an object that encapsulates
> the function object in a closure

s/closure/object/

> that makes sure it has a reference to
> "self." 

the method object is instanciated by the function object itself when it 
is looked up upon a class or instance (thanks to the descriptor 
protocol). It (the method object) stores the function, the class and (if 
bound) the instance as attributes, and it's __call__ method takes care 
of calling the function with the instance as first positional argument.

> I know that you dynamically add functions to objects creating
> methods dynamically, by using new.instancemethod or something.

Or simply by manually invoking the descriptor protocol:


def func(self):
    print "self is", self

class Foo(object):
    pass

f = Foo()
f.func = func.__get__(f, type(f))

print dir(f.func)

> 
> This seems to indicate to me that there are functions and there are
> functions.  Methods are in fact functions, just with a callable wrapper
> around them.

Methods *are* the callable wrapper around functions - so they can't be 
functions themselves. From this POV, the functions wrapped by methods 
are actually the *implementation* of the method.



From ove.svensson at jeppesen.com  Mon Feb  2 05:01:12 2009
From: ove.svensson at jeppesen.com (Ove Svensson)
Date: Mon, 02 Feb 2009 11:01:12 +0100
Subject: Get thread pid
References: <1f4ff371-447d-4eca-8c51-e73eb10ed8c5@a12g2000pro.googlegroups.com>
	<mailman.8396.1233348060.3487.python-list@python.org>
	<31508b6d-bebb-45e6-b57c-525d370e22c0@r37g2000prr.googlegroups.com>
Message-ID: <9g8wopuphz.fsf@overberg.jeppesensystems.com>

Alejandro <alejandro.weinstein at gmail.com> writes:

> On Jan 30, 1:40?pm, Christian Heimes <li... at cheimes.de> wrote:
>> May I ask why you want to get the TID?
>
> htop shows the TID of each thread. Knowing the TID allows me to know
> which thread is hogging the CPU. If there is a better way to do this,
> or there is something fundamentally wrong with this approach, please
> let me know.
>
> Alejandro.

Assuming we are talking about a  posix (pthread) architecture, 
you can't really say anything about the thread id (TID). Pthreads
identifies each thread with the anonymous type pthread_t. If you
want to write a portable application, you must not assume anything
regarding the real type. It could be an integer, pointer, struct
or something else. Just because some operating systems use an
integer for the pthread_t doesn't mean that others do the same.

It is true that the operating system must have some way to identify
each thread (within each process), but it is not visible or accessible
to the application.

If you have a threading *framework* on top of pthreads, which uses 
some TID, that is then either purely an artificial id or a non-portable 
architecture specific access to the operating system id. For example,
python thread.get_ident() returns the `thread identifier' of the 
current thread. That TID can be *anything*. You must not assume that
id has any meaning (other than being unique per thread). The python
class threading.Thread has methods setName() and getName() for
setting and fetching the *name* of a thread. That is a pure application
name and has nothing to do with the id used by the operating system.

The reason that python modules thread and threading doesn't return
any real TID is simply that there isn't any TID that it can return.
At least not in any portable way.

If you find a way to get to the real TID, that will be specific to
your architecture.

If htop (or any other application) returns a TID, that is either
artificial or architecture specific.



From clp2 at rebertia.com  Mon Feb  2 05:01:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 02:01:45 -0800
Subject: how to create data to dump into yaml file
In-Reply-To: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>
References: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>
Message-ID: <50697b2c0902020201p3ce5879bnd9bf1c10ec6d0756@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:41 PM,  <sibteym at infotechsw.com> wrote:
> hi
>    I have to create a yaml file using my list of objects.shall i need to
> create a string using my objects and then load and dump that string or
> is there any other way to create the yaml file.
>
> i want a yaml file to be created from [Text, Author,......]in this format
> Text:
>    - value1
>    - value2
>    - value 3
> Author:
>     name: bookName

The PyYAML library is available on http://pyyaml.org/
Also, since JSON is essentially a subset of YAML, you could use the
`json` module (http://docs.python.org/library/json.html) in the Python
std lib, albeit with differently formatted results.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From s.selvamsiva at gmail.com  Mon Feb  2 05:11:56 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 2 Feb 2009 15:41:56 +0530
Subject: importing module-performance
In-Reply-To: <50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>
References: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
	<50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>
Message-ID: <b423b9550902020211q14da5674w8ea0db345448d018@mail.gmail.com>

On Mon, Feb 2, 2009 at 3:11 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Feb 2, 2009 at 1:29 AM, S.Selvam Siva <s.selvamsiva at gmail.com>
> wrote:
> > Hi all,
> > I have a small query,
> > Consider there is a task A which i want to perform.
> >
> > To perform it ,i have two option.
> > 1)Writing a small piece of code(approx. 50 lines) as efficient as
> possible.
> > 2)import a suitable module to perform task A.
> >
> >
> > I am eager to know,which method will produce best performance?
>
> A. Your question seems much too vague to answer.
> B. Premature optimization is the root of all evil. In all likelihood,
> the time taken by the `import` will be absolutely trivial compared to
> the rest of the script, so don't bother micro-optimizing ahead of
> time; write readable code first, then worry about optimization once
> it's working perfectly.
>
> Cheers,
> Chris
> --
> Follow the path of the Iguana...
> http://rebertia.com



Thank you Chris,

 I faced a optimization problem as follow,

For fuzzy string comparison initially i used 15 lines of code which compares
a word with 29,000 words in a list .For each set of words compared, the
15-line code produce number of differences characters of the two words.

But when i used python-levenshtein module for same reason it has run faster
than the old method.This invoked me to raise that query.

Now i understood that, it is not an issue of importing the module/writing
the code, but the problem must be with my 15-line code.


-- 
Yours,
S.Selvam
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From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 05:12:52 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 11:12:52 +0100
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <4986c724$0$10268$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :

(snip)

> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

Oh, my, What a shock! What a nightmare. Thanks, thanks thmpsn for 
opening our eyes. How can we have lived so many years with this 
permanent danger, and yet managed to write working, robust programs, I 
really wonder. Good God, we really need to fix this immediatly, because 
obviously, TRUSTING the programmer JUST CANT WORK.

Or can it ?

this-dead-horse-has-been-beaten-to-hell-and-back-pity-the-poor-animal-ly'yrs


From cd at okunah.de  Mon Feb  2 05:14:25 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 02 Feb 2009 11:14:25 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <gm6h0e$j07$2@svr7.m-online.net>

Hi,

> Just to register a contrary opinion: I *hate* syntax highlighting

With vim you simply don't turn it on. Would that be OK for you?

Christof



From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 05:15:24 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 11:15:24 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8546.1233531569.3487.python-list@python.org>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<4985DC6F.4030106@holdenweb.com>
	<mailman.8546.1233531569.3487.python-list@python.org>
Message-ID: <4986c7bc$0$10268$426a74cc@news.free.fr>

Rhodri James a ?crit :
> On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com> 
> wrote:
> 
>> Stephen Hansen wrote:
>>> [...]
>>> don't play with anyone else's
>>> privates.
>>>
>> A good rule in life as well as programming.
> 
> Unless, of course, you're both consenting adults.
> 
> What?  Someone had to say it!
> 
Indeed. Thanks for this useful clarification !-)


From asmodai at in-nomine.org  Mon Feb  2 05:18:48 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 2 Feb 2009 11:18:48 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <531189.66795.qm@web36504.mail.mud.yahoo.com>
References: <531189.66795.qm@web36504.mail.mud.yahoo.com>
Message-ID: <20090202101848.GZ99614@nexus.in-nomine.org>

-On [20090201 15:18], Craig (fasteliteprogrammer at yahoo.com) wrote:
>eclipse

With the pydev plugin of course.

Personally I prefer to just use vim and (i)python. But at work I am using
Eclipse with pydev as well.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From thorsten at thorstenkampe.de  Mon Feb  2 05:36:48 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 11:36:48 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
Message-ID: <MPG.23f0eb2cf71f9dc39897b7@news.individual.de>

* Christof Donat (Mon, 02 Feb 2009 11:14:25 +0100)
> > Just to register a contrary opinion: I *hate* syntax highlighting
> 
> With vim you simply don't turn it on. Would that be OK for you?

No. Even the /possibility/ of having syntax highlighting would indicate 
wimpness and thus humiliate me.

Thorsten


From w.richert at gmx.net  Mon Feb  2 05:42:23 2009
From: w.richert at gmx.net (Willi Richert)
Date: Mon, 2 Feb 2009 11:42:23 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <20090202101848.GZ99614@nexus.in-nomine.org>
References: <531189.66795.qm@web36504.mail.mud.yahoo.com>
	<20090202101848.GZ99614@nexus.in-nomine.org>
Message-ID: <200902021142.23513.w.richert@gmx.net>

Hi,

I used eclipse/pydev quite some time. What pulled me back into the arms of 
emacs was:

 - ability to save bookmarks (meaning a point in  a file) at all the 
keystrokes. Never found out how to do that in eclipse. In emacs I have now all 
the times "j" save at the current working position, "f" at the last failure I 
have to work on, and so on.

- just faster then pydev. Once pydev tries to "understand" your python code 
(refactoring) you can go and get a coffee

- ecb, tabbar, psvn provide the same functionality of eclipse you use in 
everyday.

Of course, it takes some time to use emacs. But it pays back with a nice 
Python integration and the advantage to customize everything you want.

wr

On Montag, 2. Februar 2009 11:18:48 Jeroen Ruigrok van der Werven wrote:
> -On [20090201 15:18], Craig (fasteliteprogrammer at yahoo.com) wrote:
> >eclipse
>
> With the pydev plugin of course.
>
> Personally I prefer to just use vim and (i)python. But at work I am using
> Eclipse with pydev as well.


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From tino at wildenhain.de  Mon Feb  2 05:45:21 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 02 Feb 2009 11:45:21 +0100
Subject: key capture
In-Reply-To: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
References: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
Message-ID: <4986CEC1.6060209@wildenhain.de>

Hi,

swamynathan wrote:
> hello,
> im making a virtual piano in python where on key stroke a wav is played 
> from a location
> now to implement  a fully functional piano i need to have multiple key 
> stroke captures  ie if 2 or 3 keys pressed then the function which 
> playes the wav is called with 3 parameters


> how to implement this or any other suggestion(i was asked to try multi 
> threading which dint seem optimal)

Are you trying to do this with a computer keyboard or with an
attached midi or usb music keybord? If the former, you are probably
w/o luck because afaik there is no way to track the event
of having random keys pressed the same time.
(Last time I did it was with a real C=64 where you have access
  to the key matrix)

If you manage to receive the keypress events, multithreading is
probably easiest to do but it really depends on the way you
play the sounds - at least the playback needs to be asynchronously
so you can catch note-on, note-off events during playback.

Good luck
Tino
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From deets at nospam.web.de  Mon Feb  2 05:58:19 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 11:58:19 +0100
Subject: Problem With py2exe and ConfigParser
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
	<6um1i1FfqskrU1@mid.uni-berlin.de>
	<7fad9e49-df2e-46db-a3cc-6e5b9f55e773@q36g2000vbn.googlegroups.com>
Message-ID: <6uo1ubFgdclfU1@mid.uni-berlin.de>

berserker992 at gmail.com wrote:

> 
> You can set an example? My English is bad, so I do not quite
> understand

You need to give a proper path to the config.ini. It's not found, which most
probably occurs because you give a relative path ("config.ini") but that
doesn't work because the current working directory has a different value
from what it has when you run the problem differently.

So, you need to give a full path. 

Diez


From nospam at nospam.com  Mon Feb  2 06:07:18 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 02 Feb 2009 12:07:18 +0100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
Message-ID: <5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>

On Mon, 02 Feb 2009 20:06:02 +1100, Ben Finney
<bignose+hates-spam at benfinney.id.au> wrote:
>The Python data types for date and time are in the ?datetime? module
><URL:http://www.python.org/doc/2.6/library/datetime>. Create a
>?datetime? object for each value you want, then compare them.

Thanks guys. For those interested, here's how to perform the
conversion from DD/MM/YYYY to YYYY-MM-DD:

=====
import datetime

connection = datetime.datetime.strptime("21/02/2008",
"%d/%m/%Y").strftime("%Y-%m-%d")
print connection
=====


From mail at microcorp.co.za  Mon Feb  2 06:13:42 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 13:13:42 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
Message-ID: <003d01c98527$d9ea4ec0$0d00a8c0@hendrik>

"Stephen Hansen" <apt.shansen at gmail.com> wrote:



8<----------- arguments for the status quo ------
> 
> I'm missing the careful explanation. What I've heard is that the lack
> of enforced encapsulation is "a danger". What I've heard is that
> people want it because they've been told they should want it and
> believe that. Why?
> 
> Part of my lack of understanding might be because people couldn't read
> my previous messages because my mail client's configuration
> accidentally got fubar'd and I was sending HTML mail instead of plain
> text. But my question remains: Why do you need forced encapsulation?
> 
> There have been no "careful explanations" to answer that, in my mind.
> And thus my response is: the practical possibility of needing access
> vastly outweights the theoretical situation that might go bad if
> encapsulation wasn't there. Why? Because in any real situation, IMHO,
> *forced* encapsulation is pointless.
> 
> If you are writing end-level code, you can achieve forced
> encapsulation by simply not playing with anyones privates. If you are
> in a corporate environment who has rules about accessing privates
> written by another team for valid reasons, your policy to not do so
> should be enough or your review process should pick it up. If you are
> in an open source environment accepting patches from various people,
> you should have a clear policy about the subject if you think breaking
> encapsulation is never acceptable and refuse the patches. Those who
> have commit access and violate encapsulation anyways against your
> projects policy are problems that you clearly need to deal with. The
> problem is not the language at that point, its the contributor.
> 
> 
> > It has all the time been countered with statements
> > about how the proponents of private attributes "don't need it",
> > (as if they are plain dumb),
> 
> They don't need it. No one has shown a *real* reason why. The only

Repeating it, (despite my assertion lately in another thread) does not 
make it true - what follows is simply an opinion on how to solve
the problem "by management", instead of providing a different tool.

> reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> That's not a real reason. If its your project that someone is doing
> bad in, this is a situation which can be *clearly* specified in a
> projects policy and coding standards and can be *trivially* tested for
> with simple static analysis in nearly all cases. The problem is the
> person and not the code then. There's *countless* other ways that
> person can do bad if you're allowing them to commit blindly anything
> into your project.
> 
> If its your projet which someone else is using, and accessing your
> internals that are clearly private and not documented: its not your
> problem if they stab themselves in the foot. On the contrary, why in
> the name of all that is holy, do you care if they manipulate your
> internals at their own risk, at their own cost, and achieve something
> positive for them? How in any way does this hurt you?
> 
> 
> >  that an underscore convention is
> > "just as good", (It isn't),
> 
> Why isn't it?

Because it needs human intervention.

> 
> > that you could crack it if you really
> > tried, (so what?),
> 
> Exactly.. so what? WHY is the convention not enough? What REAL
> situation is there that the lack of *forced* encapsulation but policy
> based encapsulation not enough?
> 

See human intervention above - and as for 
"real, forced data hiding" - have you ever
coded anything that produced a segmentation fault?

I wonder why the designers of processors do such silly things as having
user and supervisor modes in the hardware - according to your
arguments a code review would solve the problem, and then they
could use the silicon saved to do other usefull stuff. - then any process
could use any instruction, and it would be all right. - easy to manage
out of the project - you just have to scan the object code for op codes
that you have decided are dangerous (for whatever stupid reason). 

Another example out of the processor world is the fact that some
modern processors actually force a process to keep in its own 
memory.  What temerity! Who do these idiots think they are
to try to keep "me" from accessing "your" memory - after all, 
I have a good reason - (I'm inquisitive)

This is of course rather more difficult to pick up in a code review,
as I could easily calculate the address, which makes it not
immediately apparent that I will access something not belonging 
to me.  And seeing that Python is not dynamic at all, there is
no analogy here...

> > Surely if "we are all adults here" we have to accept that the
> > other man has as much right to get what he wants, as
> > anybody else, and that his reasons are as valid as those of
> > anybody else.
> 
> Yes., We're all consenting adults.
> 
> But if one adult decides to make rules that the other doesn't agree
> to, is that consenting adults, or is that rape? I apologize for the
> use of the term, but "consenting adults" has particular connotations
> that seem to apply very well here, in the context of that expression.
> 
> Forced encapsulation allows one party to make absolute rules and hold
> absolute authority over another party.
> 

I do not agree with this. If _I_ write a module, and _I_ use forced 
encapsulation for _my_  purposes ( however misguided you might 
think I am) then how does that affect _you_?

Even if I release the thing into the wild - you do not have to use it
if you feel you really *must* muck around with the equivalent
of Steve D'A's example of the length of a builtin - you could write 
your own, or fork what I have done. - It seems that by denying me
the use of such a feature, you are the one trying to make absolute
rules, for *your* benefit - *you* want to use *my* stuff, on *your* 
terms, without having to bother to put any effort into it.

8<----- repeat of "code review cures all" argument ------

> Really. I just don't get the problem. It seems to me that people who
> want this in Python will never be happy *in* Python. Its a very deep
> fundamental feature that Python exposes everything it can, even things
> that are potentially dangerous like sys._getframe. Recently on
> Python-dev(note: I only lurk) someone was working on a debugger and
> they were told in that situation it was OK to access a private member
> of sys to achieve an end: exposing that internal to general use just
> had no value. That's the Python Way. People can dig into things,
> classes, functions, and screw around in wild ways if they want to.
> That *is* what Python is. 95% of code by 95% of people won't ever go
> there, but its there. To remove it means its *not* Python.

Now there are a LOT of dicey statements in the above passionate 
plea - python is a language, and not a philosophy, but I won't go 
into that, as that would lead off onto a tangent, of which there have
been a surfeit in this thread.

But this needs addressing:

Nobody is saying that "Python" should change the way "Python" 
exposes stuff - All that is being requested that *I* should be 
allowed to use python to expose as much of *my* class as *I* 
deem fit, for *my* purposes.

And some form of "private" keyword would do that nicely, 
thank you, and keep the current "public" default unchanged.

Now this is from a user perspective - It may prove to be
difficult, if not impossible, to implement in CPython.  I just
don't know enough details of the implementation to be able 
to tell.

Maybe what is needed is some form of *Interpreter* vs. 
*User* state, analogous to what is done in the hardware,
with defined, "code reviewable, testable for",  procedures 
for switching between one and the other.

- Hendrik




From digitig at gmail.com  Mon Feb  2 06:14:10 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 2 Feb 2009 11:14:10 +0000
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
	<e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <aee48b3c0902020314u32b1bce6l57a1e105c417c9a2@mail.gmail.com>

2009/2/1 MattBD <matthewbdaly at googlemail.com>:

> Really it depends what you are doing. Some languages are very tightly
> integrated with an IDE, such as MS Visual C#, and as far as I can see
> it would be extremely difficult, if not impossible to use a text
> editor with that language.

Why so? I don't see how it would be any different to any other
language. Admittedly I use the IDE because I like IDE's, but I don't
see why it wouldn't work with a text editor and make -- the command
line compiler is there.

-- 
Tim Rowe


From andrew at acooke.org  Mon Feb  2 06:58:10 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 2 Feb 2009 03:58:10 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <be175e80-64a7-4a2c-8a24-02a47aadd6f4@b1g2000yqg.googlegroups.com>

> Just to register a contrary opinion: I *hate* syntax highlighting

you can use it in surprising ways, if the implementation is good
enough.  when i used intellij with java i had the "syntax"
highlighting set so that everything was simple black+white, but
mutable state (i can't remember the exact details; perhaps it was just
variables that were assigned, i am not sure what happened with
attributes) was in bold.  very neat - showed where the likely bugs
were in the code - and nothing to do with what you'd normally consider
syntax highlighting...

andrew

(last time i looked, intellij's support for python was not very good.
which is a pity, because it was an excellent ide - better than
eclipse, imho).


From deets at nospam.web.de  Mon Feb  2 07:01:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 13:01:28 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<mailman.8596.1233574041.3487.python-list@python.org>
Message-ID: <6uo5koFg8q28U1@mid.uni-berlin.de>

> I wonder why the designers of processors do such silly things as having
> user and supervisor modes in the hardware - according to your
> arguments a code review would solve the problem, and then they
> could use the silicon saved to do other usefull stuff. - then any process
> could use any instruction, and it would be all right. - easy to manage
> out of the project - you just have to scan the object code for op codes
> that you have decided are dangerous (for whatever stupid reason).

This is comparing apples to oranges. Forced data encapsulation or not take
place *inside one process*. So this whole argument is a straw-man.

I've seen a lot of programs segfault that are written in C++ with data
encapsulation. And also a lot of them that overcame the restrictions the
compiler or even runtime in java imposed on them, either by pointer-magic,
or through some available backdoors that have been put in place for good
reasons.

So far I haven't seen any argument for forced data encapsulation that went
beyond a matter of personal taste. That's fine, but also just that.

Diez


From cd at okunah.de  Mon Feb  2 07:07:57 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 02 Feb 2009 13:07:57 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
Message-ID: <gm6nla$slr$1@svr7.m-online.net>

Hi,

>> > Just to register a contrary opinion: I *hate* syntax highlighting
>> 
>> With vim you simply don't turn it on. Would that be OK for you?
> 
> No. Even the /possibility/ of having syntax highlighting would indicate
> wimpness and thus humiliate me.

Ah, I guess you are using butterflies then: http://xkcd.com/378/

Christof



From zasaconsulting at gmail.com  Mon Feb  2 07:10:15 2009
From: zasaconsulting at gmail.com (Alessandro Zivelonghi)
Date: Mon, 2 Feb 2009 13:10:15 +0100
Subject: sorting mesh data an from abaqus simulation
Message-ID: <f90d1a1c0902020410p3233185ey8ad425edfcff18d6@mail.gmail.com>

Hello there :) ,

I am a python newbie who needs help with tables(lists?) and other data
structures. My mechanical engineering simulation program (Abaqus) use a
Python env to access model data and results from a simulation. For me a
model means a "mesh" of that model, i.e. a lists of nodes and elements which
discretized the CAD model.
In Abaqus each mesh has the following structure (see "
http://www.tecnopolis.eu/upload/mesh.inp"):

- a list of NODES in form of a table ( nodelabel_n, coordinatex,
coordinatey)

- and a list of ELEMENTS also in form of a table. Each element refers to
three nodes (which must be in the list of nodes) and the table looks like
this

 (elementlabel_n, node_n1, node_n2, node_n3)

Through following py script I can access all nodes (--> *N*) and elements
(--> *EL*) from the "mesh-1.odb" file (
http://www.tecnopolis.eu/upload/mesh-1.odb) where the simulation results are
stored.

*from odbAccess import *
from odbSection import *

nameodb = 'mesh-1'


path = '/onepath/' + nameodb + '.odb'
odb = openOdb(path)

**N = odb.rootAssembly.instances['PART-1-1'].nodes
*
*EL = odb.rootAssembly.instances['PART-1-1'].elements
*
Info:
to get a node label, for example the label of the node object n5 in the list
Ntop:  *Ntop[5].label*
to get the x coordinates of that node: *Ntop[5].coordinates[0]*

In particular I am interested in the node subset "TOP" (which represents all
the nodes at the top of my model)

*Ntop = odb.rootAssembly.instances['PART-1-1'].nodeSets['TOP'].nodes
*
Problem:
1) the list of nodes Ntop contains all the node labels [2673,   2675,
2676,   2677,   2678,   3655,   3656, 119939, 124154, 127919] already
ordered in ascending order.
What I need is the same list *ordered by coordinate_x* of each node, i.e.
from left to right in the model (unfortunately, for example node 124154
cames before node 3656 in the model, if you read the model from left to
right)


1b) I don't understand which kind of data are EL, N, Ntop (list?) and how
can I sort Ntop  with the criterium based on coordinate_x (coordinate[0])

Many thanks, Alex

-- 







> Alessandro Zivelonghi
>
> http://www.tecnopolis.eu
>
> skype: alexzive
>
> "Energy and persistence conquer all things."
> Benjamin Franklin (1706 - 1790)
>
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From feliphil at gmx.net  Mon Feb  2 07:15:55 2009
From: feliphil at gmx.net (Wolfgang Keller)
Date: Mon, 2 Feb 2009 13:15:55 +0100
Subject: Python package Management GUI - New Project on Sourceforge
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<mailman.8569.1233552249.3487.python-list@python.org>
Message-ID: <20090202131555.3d4ff2a4.feliphil@gmx.net>

> David, I would really recommend that you
> seriously consider using the Tcp/Tk toolkit.

I would seriously disrecommend using Tcl/Tk.

> Why ?

Because it doesn't allow to build a GUI application with not-ridiculous
functionality, "look-and-feel" and quirk-free behaviour.

> Because of my point above, you'll find the tool will most likely have
> a greater impact and uptake than one requiring a user or developer to
> install a 3rd party toolkit and library just to use your gui package
> manager :)

I'm using applications that use wxPython, PyGTK, PyQt etc. every day
that don't require to "install" anything, not even _themselves_. In fact
this (zero-install applications) is the _only_ actually "simple" way to
distribute applications. And it is the standard way to distribute
applications for the Mac.


From rdmurray at bitdance.com  Mon Feb  2 07:40:08 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 12:40:08 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
Message-ID: <gm6pj8$se0$1@ger.gmane.org>

Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> <rd.....murray at bitdance.com> wrote:
> 
> > 
> > You, sir, should be programming in some language other than Python.
> 
> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a 
> whole system without hiding a single item.
> Conversely, the lack of data hiding is perceived as a weakness,
> and IMO harms the advocacy of the language - This is proven
> by your statement above, whereby you are driving a user away,
> simply because the language, in one small aspect, does not
> give him what he wants, and the tenor of this thread has been
> very much: "That's how it is - like it or lump it", and no amount
> of careful explanation of why people want the feature has cut 
> any ice - It has all the time been countered with statements
> about how the proponents of private attributes "don't need it",
> (as if they are plain dumb), that an underscore convention is 
> "just as good", (It isn't), that you could crack it if you really 
> tried, (so what?), and other more specious reasons.
> 
> This is IMO an arrogant attitude - 

My apologies!!  There was a smiley missing from the end of that statement
above.  However, you are right, even with the smiley added it would
still be arrogant, and I regret that.

The problem is that there is a fundamental philosophical divide here,
and I don't think the advocates on either side are going to convince
the other.

This debate has happened many times.  

--RDM




From python at bdurham.com  Mon Feb  2 07:51:10 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 02 Feb 2009 07:51:10 -0500
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
Message-ID: <1233579070.32519.1298029177@webmail.messagingengine.com>

If the output is coming from a print command, couldn't the OP
temporarily redirect STDIO to a file to prevent the output from being
displayed?

Malcolm


----- Original message -----
From: "Stephen Hansen" <apt.shansen at gmail.com>
To: "Ray" <raykyoto at gmail.com>
Cc: python-list at python.org
Date: Sun, 1 Feb 2009 23:19:09 -0800
Subject: Re: Import without executing module

On Sun, Feb 1, 2009 at 11:05 PM, Ray <raykyoto at gmail.com> wrote:
> Basically, someone has created a python script and I would like to
> make use of his functions.  I would prefer to not modify his file so
> what I would like to do is just write my script and import parts that
> are needed.  i.e., I would like to separate my changes from his as
> best as I can.  However, that other module has both functions (def's,
> which I would like to use) and top-level commands which I don't need
> and in fact, prints errors when I import it since it was meant to be
> run as a top-level module and not imported in.  i.e., its expecting
> arguments to be supplied.

Unfortunately, that's not possible, I believe. All the top level
commands in a particular Python script are executed: that's how the
functions get created.

--S
--
http://mail.python.org/mailman/listinfo/python-list


From rdmurray at bitdance.com  Mon Feb  2 07:59:56 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 12:59:56 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
Message-ID: <gm6qoc$v0g$1@ger.gmane.org>

Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> Now there are a LOT of dicey statements in the above passionate 
> plea - python is a language, and not a philosophy, but I won't go 
> into that, as that would lead off onto a tangent, of which there have
> been a surfeit in this thread.

Ah, now I understand.  This is where you part company from the
people you are arguing against.

Python _is_ a philosophy.

There is no smiley after that statement.  :)

--RDM

PS: More accurately, Python _embodies_ a philosophy, and to advocate
changes that go against that philosophy is to advocate changing
Python into something that would no longer be Python.  You can do
that, but you aren't likely to get the community to follow you.



From rdmurray at bitdance.com  Mon Feb  2 08:14:52 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 13:14:52 +0000 (UTC)
Subject: Membership of multiple items to a list
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm6rkb$3bk$1@ger.gmane.org>

My client can handle your Mime and shows me the text part of the signed
message.  It's not as pretty as just seeing an unsigned text message,
but that's a client problem, not yours :)

I would like to think that all newsreader clients could handle mime at
this point, but who knows.

--RDM



From mal at egenix.com  Mon Feb  2 08:21:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 02 Feb 2009 14:21:31 +0100
Subject: install modules for specific python version
In-Reply-To: <4984F415.6090902@catphive.net>
References: <4984F415.6090902@catphive.net>
Message-ID: <4986F35B.2080003@egenix.com>

On 2009-02-01 02:00, Brendan Miller wrote:
> I have several version of python running side by side on my ubuntu
> install (2.5,2.6,3.0).
> 
> I'm installing a module with a setup.py script, in this case
> logilab-common, so that I can get pylint going. However, I need to
> install into python 2.6, but by default it picks out 2.5 and throws
> things in the site packages for that version.
> 
> Is there a standard way to specify what version of python you want to
> install into? I originally installed my other python versions with the
> altinstall method.

That's easy: just call the setup.py script with the version you want
the modules installed to, e.g.

python2.5 setup.py install
python2.6 setup.py install
etc.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 02 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mail at microcorp.co.za  Mon Feb  2 08:45:48 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 15:45:48 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<gm6pj8$se0$1@ger.gmane.org>
Message-ID: <005101c98549$d33a7420$0d00a8c0@hendrik>

<rd....murray at bi..nce.com> wrote:

> Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> > <rd.....murray at bitdance.com> wrote:
> > 
> > > 
> > > You, sir, should be programming in some language other than Python.

8<------------- reasons given ----------------

> > This is IMO an arrogant attitude - 
> 
> My apologies!!  There was a smiley missing from the end of that statement
> above.  However, you are right, even with the smiley added it would
> still be arrogant, and I regret that.

It was not actually aimed at you personally - more of a rant about
the intolerance displayed by the "it's fine as it is" group.

> 
> The problem is that there is a fundamental philosophical divide here,
> and I don't think the advocates on either side are going to convince
> the other.

It certaintly looks like that - so far it has produced more heat than
light, and very few funny comments

> 
> This debate has happened many times.  
> 

So why are we dumb enough to repeat it?

:-)

- Hendrik




From mail at microcorp.co.za  Mon Feb  2 08:54:08 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 15:54:08 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
Message-ID: <005201c98549$d3eb74a0$0d00a8c0@hendrik>

<r...ray at bi...nce.com> wrote:


> Quoth "Hendrik van Rooyen" <m.. at mi...orp.co.za>:
> > Now there are a LOT of dicey statements in the above passionate
> > plea - python is a language, and not a philosophy, but I won't go
> > into that, as that would lead off onto a tangent, of which there have
> > been a surfeit in this thread.
>
> Ah, now I understand.  This is where you part company from the
> people you are arguing against.
>
> Python _is_ a philosophy.
>
> There is no smiley after that statement.  :)
>
> --RDM
>
> PS: More accurately, Python _embodies_ a philosophy, and to advocate
> changes that go against that philosophy is to advocate changing
> Python into something that would no longer be Python.  You can do
> that, but you aren't likely to get the community to follow you.

*sits on his hands to try to avoid the tangent, with the gaping hole of religion
looming beneath the spiderweb of philosophy, and the language spec gathering
dust in the corner, forgotten and forlorn*

:-)

- Hendrik




From RLComstock3 at gmail.com  Mon Feb  2 09:06:02 2009
From: RLComstock3 at gmail.com (Robert Comstock)
Date: Mon, 2 Feb 2009 06:06:02 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net> 
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
	<gm6nla$slr$1@svr7.m-online.net>
Message-ID: <703974cb-5ef4-4ec9-9bb5-02fda4f70251@w39g2000prb.googlegroups.com>

I am personally a fan of vim and ipython.  But most of my development
is done on a remote system with ssh access.  I have used many IDE's
over the years and personally I feel like they try to hard to do
everything for you that they end up doing very little the way I would
like.  There are MANY text editors out there and all you need to do is
find the one that fits your development style.  There are not so many
IDE's and I found they wanted me to fit their styles.

Why I like Vim:

1. Light and fast
2. Goes over ssh very well
3. Simple configuration
4. Lots of flexibility
5. Can your text editor do this?
Vim search and replace, with increment
:let i=1 | g/foo/s//\=i."morestuff"/ | let i=i+1
http://gdwarner.blogspot.com
6. Fast editing (once you have paid the price to learn it)

I think the reality is productity, I would not be productive trying to
write code on my computer then moving it to a server, it would be
difficult to duplicate the enviroment without leaving my PC a garbage
dump of packages I don't need.  But that is not the case for many
people.  I also like Kate, it has server me well in my quest to learn
vim.

Thanks,

Robert Comstock


Lenovo T61 2.2Ghz/3GB Ram, Arch Linux x86_64, KDE 4.2




On Feb 2, 5:07?am, Christof Donat <c... at okunah.de> wrote:
> Hi,
>
> >> > Just to register a contrary opinion: I *hate* syntax highlighting
>
> >> With vim you simply don't turn it on. Would that be OK for you?
>
> > No. Even the /possibility/ of having syntax highlighting would indicate
> > wimpness and thus humiliate me.
>
> Ah, I guess you are using butterflies then:http://xkcd.com/378/
>
> Christof



From kdawg44 at gmail.com  Mon Feb  2 09:14:26 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 09:14:26 -0500
Subject: Refreshing an IE Webpage
Message-ID: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>

Hi,

I am trying to get and then refresh a page in IE with a Python script.  I
just want to get a page, then refresh it every 5 minutes.  Below is the code
I am attempting.  It is erroring out on the
id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
#tried with and without parens - reload & reload()
line.  This is mostly a borrowed script I found.  The script was trying to
call a written function on the page.  I just want to call the build in
reload function to refresh the page.

Thanks for any help.

Kevin


import win32com.client, pythoncom
from time import sleep

ie=win32com.client.Dispatch('internetexplorer.application')
ie.Visible=1
ie.Navigate('URL')
sleep(5)

id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
while True:
    res=ie.Document.Script._oleobj_.Invoke(id, 0, pythoncom.DISPATCH_METHOD,
True)
    sleep(300)
-------------- next part --------------
An HTML attachment was scrubbed...
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From aahz at pythoncraft.com  Mon Feb  2 09:30:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 06:30:00 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
Message-ID: <gm7018$j39$1@panix3.panix.com>

In article <874ozd3cr3.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>aahz at pythoncraft.com (Aahz) writes:
>>
>> Just to register a contrary opinion: I *hate* syntax highlighting
>
>On what basis?

It makes my eyes bleed
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From grflanagan at gmail.com  Mon Feb  2 09:37:36 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Mon, 02 Feb 2009 14:37:36 +0000
Subject: ElementTree and clone element toot
In-Reply-To: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
Message-ID: <gm70fg$l49$1@ger.gmane.org>

m.banaouas wrote:
> Hi all,
> Working with the ElementTree module, I looked for clone element function but not
> found such tool:
> 
> def CloneElment(fromElem, destRoot = None)
> fromElem is the element to clone
> destRoot is the parent element of the new element ; if None so the new element
> will be child of fromElem parent. The clone operation is recursive to make it
> process all subtree of the element to clone.
> 
> here is my first implementation:
> 
> def CloneElement(fromElem, destRoot = None):
>   if destRoot == None:
>     fromRoot = ET.ElementTree(fromElem).getroot()
>     destRoot = fromRoot
>   destElem = destRoot.makeelement(fromElem.tag, fromElem.attrib)
>   destRoot.append(destElem)
>   destElem.text = fromElem.text
>   for e in fromElem.findall('*'):
>     CloneElement(e, destElem)
> #
> this function works fine only if destRoot parameter is defined by the caller
> context. The problem is about retreiving parent element: I didn't found any way
> to determine the parent element of an element "elem" by asking elem itself!
> and ET.ElementTree(fromElem).getroot() is wrong because it returns fromElem
> itself, not its parent.
> 
> Thanks for any help.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 


Maybe `dest = ET.fromstring(ET.tostring(src))` would do?

Or as follows:

from xml.etree import ElementTree as ET

s = '''
<root>
    <a name="A">text
    <b name="B"><bb name="BB">BBtext
    </bb></b>
    </a>
    <c />
    <d name="D" />
    <e>EEText</e>
</root>
'''

e = ET.fromstring(s)

def clone(elem):
     ret = elem.makeelement(elem.tag, elem.attrib)
     ret.text = elem.text
     for child in elem:
         ret.append(clone(child))
     return ret

f = clone(e)

assert ''.join(ET.tostring(e).split()) == ''.join(ET.tostring(f).split())

assert f[0].get('name') == e[0].get('name')

f[0].set('name', 'NEWNAME')

assert f[0].get('name') == 'NEWNAME'
assert f[0].get('name') != e[0].get('name')



From gagsl-py2 at yahoo.com.ar  Mon Feb  2 09:59:44 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 12:59:44 -0200
Subject: Config files editor
References: <gm4lgh$fdv$1@ger.gmane.org>
Message-ID: <op.uoqbxufbx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 15:17:34 -0200, Tim Michelsen  
<timmichelsen at gmx-topmail.de> escribi?:

> Hello Python,
> does anyone know of a Python based project that has a GUI based  
> functionality to edit
> config files read/written by ConfigParser?

I think that people likes the ConfigParser format in part because it can  
be edited using *any* kind of editor.
If you provide useful comments for all settings, most users should be able  
to modify it by themselves -- at least *my* type of users, perhaps your  
environment is different.

-- 
Gabriel Genellina



From alejandro.weinstein at gmail.com  Mon Feb  2 10:00:43 2009
From: alejandro.weinstein at gmail.com (Alejandro)
Date: Mon, 2 Feb 2009 07:00:43 -0800 (PST)
Subject: Get thread pid
References: <1f4ff371-447d-4eca-8c51-e73eb10ed8c5@a12g2000pro.googlegroups.com>
	<mailman.8396.1233348060.3487.python-list@python.org>
	<31508b6d-bebb-45e6-b57c-525d370e22c0@r37g2000prr.googlegroups.com>
	<9g8wopuphz.fsf@overberg.jeppesensystems.com>
Message-ID: <5a2414d1-128e-4a02-bb81-d981429bf8b8@p2g2000prf.googlegroups.com>

On Feb 2, 3:01?am, Ove Svensson <ove.svens... at jeppesen.com> wrote:
> If you find a way to get to the real TID, that will be specific to
> your architecture.
>
> If htop (or any other application) returns a TID, that is either
> artificial or architecture specific.

Right know I only need the TID for debugging under Linux. I will keep
this information in mind though.

Alejandro.


From sjmachin at lexicon.net  Mon Feb  2 10:14:48 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 07:14:48 -0800 (PST)
Subject: Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au> 
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
Message-ID: <65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>

On Feb 2, 10:07?pm, Gilles Ganault <nos... at nospam.com> wrote:
> On Mon, 02 Feb 2009 20:06:02 +1100, Ben Finney
>
> <bignose+hates-s... at benfinney.id.au> wrote:
> >The Python data types for date and time are in the ?datetime? module
> ><URL:http://www.python.org/doc/2.6/library/datetime>. Create a
> >?datetime? object for each value you want, then compare them.
>
> Thanks guys. For those interested, here's how to perform the
> conversion from DD/MM/YYYY to YYYY-MM-DD:
>
> =====
> import datetime
>
> connection = datetime.datetime.strptime("21/02/2008",
> "%d/%m/%Y").strftime("%Y-%m-%d")
> print connection



Gilles, that's certainly one way of doing it in Python.

Here's another:

>>> '-'.join(reversed('21/02/2008'.split('/')))
'2008-02-21'

Please consider the following:
If in fact the database has a text-type column (VARCHAR or similar)
that contains dates formatted as DD/MM/YYYY:

(1) somebody should be talking rather bluntly to the database
designer, and that column should be fixed if possible without breaking
other code

(2) doing the comparison on the client side (i.e. in Python) instead
of on the server side (i.e. in SQL) means that there will be
unnecessary data transmitted to the client side -- hence this should
only be considered if the volume of data is small. Imagine trying to
do a relational join using that column and another (normal) date
column by sucking both tables down to the client!

(3) it's quite possible to do the comparison in SQL:

e.g. if the column is named "d":

WHERE SUBSTR(d, 7, 4) || SUBSTR(d, 4, 2) || SUBSTR(d, 1, 2) <
'20090201' -- insert '-' if preferred
or something similar should be doable in any SQL implementation. Most
will have functions like str[pf]time that could be used to similar
effect.

Cheers,
John


From gagsl-py2 at yahoo.com.ar  Mon Feb  2 10:18:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 13:18:08 -0200
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gm70fg$l49$1@ger.gmane.org>
Message-ID: <op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan <grflanagan at gmail.com>  
escribi?:

> e = ET.fromstring(s)
>
> def clone(elem):
>      ret = elem.makeelement(elem.tag, elem.attrib)
>      ret.text = elem.text
>      for child in elem:
>          ret.append(clone(child))
>      return ret
>
> f = clone(e)

You forget the tail attribute, and you also should use the SubElement  
factory instead of makeelement as documented; doing that fixes the  
"parent" issue too.

-- 
Gabriel Genellina



From drkjam at gmail.com  Mon Feb  2 10:18:39 2009
From: drkjam at gmail.com (David Moss)
Date: Mon, 2 Feb 2009 07:18:39 -0800 (PST)
Subject: the 'right way' to distribute and access data files in a packaged 
	Python module
Message-ID: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>

Hi,

I'm the author of netaddr :-

    http://pypi.python.org/pypi/netaddr/0.6

For release 0.6 I've added setuptools support so it can be distributed
as a Python egg package using the easy_install tool.

In 0.6, I've started bundling some data files from IEEE and IANA with
the code below the site-packages install path (lib/site-packages/
netaddr/...). netaddr accesses and parses these files on module load
to provide various IP and MAC address related information via its API.

This mechanism works for the setuptools based packages because on
install they extract to the filesystem and can be accessed using
something like :-

    >>> index = open(os.path.join(__file__, 'oui.idx'))

However, setuptools seems to perform some magic for module imports
which prevents me from accessing these files directly as they are
bundled inside an egg (zip) file :-(

Two questions arise out of this situation :-

1) is there a better way to distribute the files, i.e. should I be
using a different more correct path instead of site-packages for data?
If so, where is this and how do I add it to my setup scripts and code?

2) is there an easy (and portable) way for me to dive inside an egg
file to access the data I required (ugly but workable). I'm assuming
I'd need to check for the presence of setuptools available with the
Python interpreter etc.

My users and I would be grateful for and help and advice.

Many thanks,

Dave M.


From mail at microcorp.co.za  Mon Feb  2 10:20:01 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 17:20:01 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org>
	<6uo5koFg8q28U1@mid.uni-berlin.de>
Message-ID: <005301c98549$d4934d60$0d00a8c0@hendrik>


Hendrik:
> > I wonder why the designers of processors do such silly things as having
> > user and supervisor modes in the hardware - according to your
> > arguments a code review would solve the problem, and then they
> > could use the silicon saved to do other usefull stuff. - then any process
> > could use any instruction, and it would be all right. - easy to manage
> > out of the project - you just have to scan the object code for op codes
> > that you have decided are dangerous (for whatever stupid reason).
> 
Diez:
> This is comparing apples to oranges. Forced data encapsulation or not take
> place *inside one process*. So this whole argument is a straw-man.

I do not agree with this, but then I won't will I? 

The reason is that I see a level of abstraction that makes it kind of
irrelevant whether something is run as a process, a thread, a time
multiplexed mainloop, on one or more processors, wherever or 
whatever - almost like a fractal structure spread across the total 
addressable space - and I would like to use the same rules 
everywhere.  And if there are reasons for forced encapsulation
*somewhere*, then it is more elegant (to my taste) to allow it 
*everywhere*.  - and conversely, of course.  Hence the rather 
*an der Haare herbeigezogen* (see ** below) argument 
based on the forced restrictions in processors.

I see almost any piece of code that "does something" as a black
box that has inputs and outputs - and I like to string them together
in a style that resembles a systolic array - closer to unix piping ,
based on true queueing and message passing, where it becomes 
at all practical.

Given this approach, there is no reason whatever for anything
to mess with any other thing's innards - in fact the less you know 
about it, the more robust and predictable the system becomes.

And in embedded processes, there exist things that are time
critical, that are designed to be used in one way, and no other,
and that can have serious consequences if messed with- when
I have started moving the 100 tonne mass, then I *cannot* tolerate
other code changing my timeouts or speeds or feeds in an arbitrary
fashion - EXPENSIVE noises will result.

> I've seen a lot of programs segfault that are written in C++ with data
> encapsulation. And also a lot of them that overcame the restrictions the
> compiler or even runtime in java imposed on them, either by pointer-magic,
> or through some available backdoors that have been put in place for good
> reasons.

I think that segfaulting is basically caused by programming error - 
By the inability of the programmer actually to understand the 
limitations of the compiler to "do what I mean".

Encapsulation or data hiding will never "cure" that, because
at best it could move some of the errors from runtime to 
compile time.

I doubt the "good reasons for backdoors" part - I think that comes 
from a design that has either not been done, or used, at the correct 
level of granularity.

> So far I haven't seen any argument for forced data encapsulation that went
> beyond a matter of personal taste. That's fine, but also just that.

This could be true, and if it is, we are just beating our heads one against
the other, trying to win non existent prizes for pig-headedness.

I could also turn that argument around, as well as stating it stronger:

So far I have not seen any argument in favour of free access to
the internals of another piece of code that is based on ANY necessity,
(beside a handwaving "good reasons" ) or that goes beyond a matter
of personal taste based on a hacker's glee in meddling in somebody
else's code.

:-)

- Hendrik

** -*an der Haare herbeigezogen* German, literally "drawn closer by the hair"
expression denoting either a specious argument or a forced analogy.  Sorry,
but I could think of no English equivalent.






From kyosohma at gmail.com  Mon Feb  2 10:30:54 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 07:30:54 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
References: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>
Message-ID: <0e7db74f-091a-4948-a330-bd57599deecf@v5g2000pre.googlegroups.com>

On Feb 2, 3:05?am, pranav <pra... at gmail.com> wrote:
> Hi Folks,
>
> I am designing a project for Windows XP/Vista, one part of which is a
> background process that monitors internet connections. If the user
> tries to connect to any particular site, say myDummySite.com in then
> some actions are taken, based on fixed policies.
> This can be thought of a mini firewall.
>
> I am sure there must be some good libraries for this purpose. I need
> the names of those libraries.
>
> Thanks,
>
> Pranav Prakash

You could try urllib2, socket or just call ping with subprocess.

Mike


From goon12 at gmail.com  Mon Feb  2 10:36:52 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Mon, 2 Feb 2009 10:36:52 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <gm7018$j39$1@panix3.panix.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>

I typically use vim/vi, because it's usually already installed on the
OS's I work with and vim for Windows works the same. Also, using the
same editor across these different OS's, I don't have to worry too
much soft/hard tabs. The contents of rc files on both Windows and
UNIX/Linux are the same too, so I can just maintain one run control
file for all OS's.

I have played around with some IDE's for python, and found that Komodo
Edit is pretty good. It's also free:
http://www.activestate.com/komodo_edit/


From gagsl-py2 at yahoo.com.ar  Mon Feb  2 10:39:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 13:39:50 -0200
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
Message-ID: <op.uoqdsoerx6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 06:59:16 -0200, Ron Garret <rNOSPAMon at flownet.com>  
escribi?:

> I'm running the following WSGI app under Yaro:
>
> def error(req):
>   try:
>     req.non_existent_key
>   except:
>     try:
>       return cgitb.html(sys.exc_info())
>     except:
>       return 'foo'
>
> The result of running this is 'foo'.  In other words, the reference to
> the non-existent key generates an exception as expected, but then the
> generation of the traceback generates ANOTHER exception, which I would
> not have expected.  If I add another TRY/EXCEPT block to capture this
> exception, the result is attached at the bottom of this message.

Unqualified excepts are evil -- see this recent post (mine)
http://groups.google.com/group/comp.lang.python/msg/05e822f694b6421c

But in this case you hit a known bug in cgitb - see  
http://bugs.python.org/issue4643 for a solution.

-- 
Gabriel Genellina



From grflanagan at gmail.com  Mon Feb  2 10:52:59 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Mon, 02 Feb 2009 15:52:59 +0000
Subject: ElementTree and clone element toot
In-Reply-To: <op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>	<gm70fg$l49$1@ger.gmane.org>
	<op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gm74sv$69g$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan 
> <grflanagan at gmail.com> escribi?:
> 
>> e = ET.fromstring(s)
>>
>> def clone(elem):
>>      ret = elem.makeelement(elem.tag, elem.attrib)
>>      ret.text = elem.text
>>      for child in elem:
>>          ret.append(clone(child))
>>      return ret
>>
>> f = clone(e)
> 
> You forget the tail attribute, 

I did, thanks.

and you also should use the SubElement
> factory instead of makeelement as documented; doing that fixes the 
> "parent" issue too.
> 

I suppose I would have just used the Element factory if the OP hadn't 
otherwise:

def clone(elem):
     ret = ET.Element(elem.tag, elem.attrib)
     ret.text = elem.text
     ret.tail = elem.tail
     for child in elem:
         ret.append(clone(child))
     return ret

Not sure what SubElement gains you, in the context of the above function?



From ppearson at nowhere.invalid  Mon Feb  2 10:58:43 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 2 Feb 2009 15:58:43 GMT
Subject: Membership of multiple items to a list
References: <mailman.8581.1233563066.3487.python-list@python.org>
Message-ID: <6uojhjFgavaqU1@mid.individual.net>

Sorry to whine, but here's how this looks on slrn:

On Mon, 2 Feb 2009 00:24:19 -0800 (PST), Stephen Hansen wrote:
> This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
> -------firegpg072eqfqovlg25y5x7pu7mz3
> Content-Type: text/plain; format=flowed; charset=UTF-8
> Content-Transfer-Encoding: base64
>
> T24gU3VuLCBGZWIgMSwgMjAwOSBhdCA3OjQ3IFBNLCBCZW4gRmlubmV5IDxiaWdub3NlK2hhdGVz
[many similarly informative lines omitted]
> cnJ5IGZvciB0aGUgaW5jb252ZW5pZW5jZS4gDQoNCi0tU3RlcGhlbg==
> -------firegpg072eqfqovlg25y5x7pu7mz3
> Content-Type: application/pgp-signature; name="signature.asc"
> Content-Description: OpenPGP digital signature
> Content-Disposition: attachment; filename="signature.asc"
>
>
> -------firegpg072eqfqovlg25y5x7pu7mz3--


-- 
To email me, substitute nowhere->spamcop, invalid->net.


From rNOSPAMon at flownet.com  Mon Feb  2 11:10:19 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Mon, 02 Feb 2009 08:10:19 -0800
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
	<mailman.8612.1233589195.3487.python-list@python.org>
Message-ID: <rNOSPAMon-ED547A.08101902022009@news.gha.chartermi.net>

In article <mailman.8612.1233589195.3487.python-list at python.org>,
 "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:

> En Mon, 02 Feb 2009 06:59:16 -0200, Ron Garret <rNOSPAMon at flownet.com>  
> escribi?:
> 
> > I'm running the following WSGI app under Yaro:
> >
> > def error(req):
> >   try:
> >     req.non_existent_key
> >   except:
> >     try:
> >       return cgitb.html(sys.exc_info())
> >     except:
> >       return 'foo'
> >
> > The result of running this is 'foo'.  In other words, the reference to
> > the non-existent key generates an exception as expected, but then the
> > generation of the traceback generates ANOTHER exception, which I would
> > not have expected.  If I add another TRY/EXCEPT block to capture this
> > exception, the result is attached at the bottom of this message.
> 
> Unqualified excepts are evil -- see this recent post (mine)
> http://groups.google.com/group/comp.lang.python/msg/05e822f694b6421c
> 
> But in this case you hit a known bug in cgitb - see  
> http://bugs.python.org/issue4643 for a solution.

Aha!  Thank you!  That explains everything, except this:  why does the 
problem go away when I run under wsgiref and capture the request in a 
global variable?

Feel free to treat that as a rhetorical question :)

rg


From sjmachin at lexicon.net  Mon Feb  2 11:11:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 08:11:40 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
Message-ID: <14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>

On Feb 2, 11:51?pm, pyt... at bdurham.com wrote:
> If the output is coming from a print command, couldn't the OP
> temporarily redirect STDIO to a file to prevent the output from being
> displayed?

He could, but that'd be a kludge on top of a stuff-up. He should put
the script-only statements inside
    if __name__ == '__main__':
and send the result back to the original author, who may in fact
appreciate being enlightened :-)

Cheers,
John


From james at agentultra.com  Mon Feb  2 11:17:06 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:17:06 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <873aew24ql.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From banaouas.medialog at wanadoo.fr  Mon Feb  2 11:21:29 2009
From: banaouas.medialog at wanadoo.fr (m.banaouas)
Date: Mon, 02 Feb 2009 17:21:29 +0100
Subject: ElementTree and clone element toot
In-Reply-To: <mailman.8607.1233587896.3487.python-list@python.org>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>	<gm70fg$l49$1@ger.gmane.org>
	<mailman.8607.1233587896.3487.python-list@python.org>
Message-ID: <49871c5b$0$4087$ba4acef3@news.orange.fr>

My python version is 2.4.4

def SubElement(parent, tag, attrib={}, **extra):

Can you tell me how does "parent" issue could be solved by SubElement ?
I'm looking for how to determine element parent just by asking element it self.
It seems like element doesn't know witch is its parent, while any parent knows
well witch are its childs.

My goal is to clone an element and attach it to a specified parent or to parant
of original element to clone.

may be better implementation of CloneElement is to let the caller context make
the attachement between the clone and its parent.

Gabriel Genellina a ?crit :
> En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan
> <grflanagan at gmail.com> escribi?:
> 
>> e = ET.fromstring(s)
>>
>> def clone(elem):
>>      ret = elem.makeelement(elem.tag, elem.attrib)
>>      ret.text = elem.text
>>      for child in elem:
>>          ret.append(clone(child))
>>      return ret
>>
>> f = clone(e)
> 
> You forget the tail attribute, and you also should use the SubElement
> factory instead of makeelement as documented; doing that fixes the
> "parent" issue too.
> 


From james at agentultra.com  Mon Feb  2 11:30:54 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:30:54 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <871vug243l.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From james at agentultra.com  Mon Feb  2 11:33:02 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:33:02 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <87wsc8ztmp.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From james at agentultra.com  Mon Feb  2 11:38:34 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:38:34 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <87vdrsztdh.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From gnewsg at gmail.com  Mon Feb  2 12:01:10 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Mon, 2 Feb 2009 09:01:10 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
References: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>
Message-ID: <c20afb68-6578-4996-9b0e-2af54e6f5849@i20g2000prf.googlegroups.com>

On 2 Feb, 10:05, pranav <pra... at gmail.com> wrote:
> Hi Folks,
>
> I am designing a project for Windows XP/Vista, one part of which is a
> background process that monitors internet connections. If the user
> tries to connect to any particular site, say myDummySite.com in then
> some actions are taken, based on fixed policies.
> This can be thought of a mini firewall.
>
> I am sure there must be some good libraries for this purpose. I need
> the names of those libraries.
>
> Thanks,
>
> Pranav Prakash

I doubt there's something so low-level and platform specific for
Python.
You could eventually observe what happens on the wire by using libpcap/
Winpcap ("pcapy" and "pypcap" are some python bindings I heard of) but
forget about applying policies like "allow/deny this or that traffic"
natively.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From thmpsn.m.k at gmail.com  Mon Feb  2 12:02:13 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Mon, 2 Feb 2009 09:02:13 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
Message-ID: <67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>

On Feb 2, 2:55?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > This is proven
> > by your statement above, whereby you are driving a user away,
> > simply because the language, in one small aspect, does not
> > give him what he wants, and the tenor of this thread has been
> > very much: "That's how it is - like it or lump it", and no amount
> > of careful explanation of why people want the feature has cut
> > any ice -
>
> I'm missing the careful explanation. What I've heard is that the lack
> of enforced encapsulation is "a danger". What I've heard is that
> people want it because they've been told they should want it and
> believe that. Why?

Who has said the latter? Are you just trying to spread FUD?

> There have been no "careful explanations" to answer that, in my mind.
> And thus my response is: the practical possibility of needing access
> vastly outweights the theoretical situation that might go bad if
> encapsulation wasn't there. Why? Because in any real situation, IMHO,
> *forced* encapsulation is pointless.

I think you've gotten too subjective on this matter. You might as well
say that we don't need no stinkin' OOP, we could all just be
programming with goto's.

Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
PLAIN FUNCTIONS (!!!!) !!!!

Heck, why do we even need OOP?? Long live procedural!!

We don't even need no stinkin programming languages, we could just
program using 1's and 0's!!!!!!!!!

What's with this luddite attitude, Python community?

> > It has all the time been countered with statements
> > about how the proponents of private attributes "don't need it",
> > (as if they are plain dumb),
>
> They don't need it. No one has shown a *real* reason why. The only
> reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> That's not a real reason. If its your project that someone is doing
> bad in, this is a situation which can be *clearly* specified in a
> projects policy and coding standards and can be *trivially* tested for
> with simple static analysis in nearly all cases. The problem is the
> person and not the code then. There's *countless* other ways that
> person can do bad if you're allowing them to commit blindly anything
> into your project.

Aha! I see this attitude quite often among C/C++ people, regarding
buffer overflows and uninitialized pointer dereferences: someone will
say "C and C++ are unsafe languages because they allow you to overrun
buffers", then a C/C++ zealot will respond "Hire some good
programmers".

SAME ATTITUDE.



From __peter__ at web.de  Mon Feb  2 12:05:09 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 02 Feb 2009 18:05:09 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<87wsc8ztmp.fsf@agentultra.com>
Message-ID: <gm7942$5gv$03$1@news.t-online.com>

J Kenneth King wrote:

> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
>> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> bool(-1)
>> True
>>
>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
> 
> That's an odd little quirk... never noticed that before.
> 
> I just use regular expressions myself.
> 
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.

Well, what is your suggested return value when the substring starts at
position 0?

>>> "abcde".find("abc")
0

By the way, there already is a method with a cleaner (I think) interface:

>>> "abcde".index("abc")
0
>>> "abcde".index("cde")
2
>>> "abcde".index("xyz")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: substring not found

Peter



From thorsten at thorstenkampe.de  Mon Feb  2 12:05:38 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 18:05:38 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
	<gm6nla$slr$1@svr7.m-online.net>
	<703974cb-5ef4-4ec9-9bb5-02fda4f70251@w39g2000prb.googlegroups.com>
Message-ID: <MPG.23f14648b829536f9897b8@news.individual.de>

* Robert Comstock (Mon, 2 Feb 2009 06:06:02 -0800 (PST))
> Why I like Vim:
> [...]
> 5. Can your text editor do this?
> Vim search and replace, with increment
> :let i=1 | g/foo/s//\=i."morestuff"/ | let i=i+1

I hope my editor wouldn't let me do this...

Thorsten


From kdawg44 at gmail.com  Mon Feb  2 12:05:39 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 12:05:39 -0500
Subject: Refreshing an IE Webpage
In-Reply-To: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
References: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
Message-ID: <5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>

I have also tried to do this with mechanize:

import mechanize
import time

br = mechanize.Browser()
br.open("URL")
while True:
     br.reload()
     time.sleep(300)

After a bunch of time, I get the following error:
C:\>SDE_KeepAlive-v2.py
Traceback (most recent call last):
 File "C:\SDE_KeepAlive-v2.py",
line 1
1, in <module>

 File
"C:\Python25\lib\site-packages\mechanize-0.1.9-py2.5.egg\mechanize\_mecha
nize.py", line 345, in reload
 File
"C:\Python25\lib\site-packages\mechanize-0.1.9-py2.5.egg\mechanize\_mecha
nize.py", line 257, in _mech_open
mechanize._response.httperror_seek_wrapper: HTTP Error 302: The HTTP server
retu
rned a redirect error that would lead to an infinite loop.
The last 30x error message was:
Found




And on my first code, trying to use the Win32 api, I get the following
error:

C:\> SDE_Keep_Alive.py
Traceback (most recent call last):
 File "C:\SDE_Keep_Alive.py",
line 8,
in <module>
   id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload')
pywintypes.com_error: (-2147352570, 'Unknown name.', None, None)



All I want to do is grab a page and refresh it every 5 minutes.

Thanks.

--
Kevin



On Mon, Feb 2, 2009 at 9:14 AM, K-Dawg <kdawg44 at gmail.com> wrote:

> Hi,
>
> I am trying to get and then refresh a page in IE with a Python script.  I
> just want to get a page, then refresh it every 5 minutes.  Below is the code
> I am attempting.  It is erroring out on the
> id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
> #tried with and without parens - reload & reload()
> line.  This is mostly a borrowed script I found.  The script was trying to
> call a written function on the page.  I just want to call the build in
> reload function to refresh the page.
>
> Thanks for any help.
>
> Kevin
>
>
> import win32com.client, pythoncom
> from time import sleep
>
> ie=win32com.client.Dispatch('internetexplorer.application')
> ie.Visible=1
> ie.Navigate('URL')
> sleep(5)
>
> id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
> while True:
>     res=ie.Document.Script._oleobj_.Invoke(id, 0,
> pythoncom.DISPATCH_METHOD, True)
>     sleep(300)
>
>
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From thorsten at thorstenkampe.de  Mon Feb  2 12:06:38 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 18:06:38 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <MPG.23f146877dac7c309897b9@news.individual.de>

* Aahz (2 Feb 2009 06:30:00 -0800)
> In article <874ozd3cr3.fsf at benfinney.id.au>,
> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >aahz at pythoncraft.com (Aahz) writes:
> >>
> >> Just to register a contrary opinion: I *hate* syntax highlighting
> >
> >On what basis?
> 
> It makes my eyes bleed

Ever tried sunglasses?

Thorsten


From apt.shansen at gmail.com  Mon Feb  2 12:07:57 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 09:07:57 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <873aew24ql.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
Message-ID: <7a9c25c20902020907h63c3f146y6db6268e4c761bd6@mail.gmail.com>

>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
>
> That's an odd little quirk... never noticed that before.
>
> I just use regular expressions myself.
>
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.

But what would you clean it up to?

str.find can return 0 ... which is a *true* result as that means it
finds what you're looking for at position 0... but which evaluates to
boolean False. The fact that it can also return -1 which is the
*false* result which evaluates to boolean True is just another side of
that coin.

What's the options to clean it up? It can return None when it doesn't
match and you can then test str.find("a") is None... but while that
kinda works it also goes a bit against the point of having boolean
truth/falsehood not representing success/failure of the function. 0
(boolean false) still is a success.

Raising an exception would be a bad idea in many cases, too. You can
use str.index if that's what you want.

So there's not really a great solution to "cleaning it up" . I
remember there was some talk in py-dev of removing str.find entirely
because there was no really c, but I have absolutely no idea if they
ended up doing it or not.

--S


From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 12:09:49 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 18:09:49 +0100
Subject: is python Object oriented??
In-Reply-To: <67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <498728db$0$27521$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
>>> This is proven
>>> by your statement above, whereby you are driving a user away,
>>> simply because the language, in one small aspect, does not
>>> give him what he wants, and the tenor of this thread has been
>>> very much: "That's how it is - like it or lump it", and no amount
>>> of careful explanation of why people want the feature has cut
>>> any ice -
>> I'm missing the careful explanation. What I've heard is that the lack
>> of enforced encapsulation is "a danger". What I've heard is that
>> people want it because they've been told they should want it and
>> believe that. Why?
> 
> Who has said the latter? Are you just trying to spread FUD?
> 
>> There have been no "careful explanations" to answer that, in my mind.
>> And thus my response is: the practical possibility of needing access
>> vastly outweights the theoretical situation that might go bad if
>> encapsulation wasn't there. Why? Because in any real situation, IMHO,
>> *forced* encapsulation is pointless.
> 
> I think you've gotten too subjective on this matter.
 >
> You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.
> 
> Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> PLAIN FUNCTIONS (!!!!) !!!!


Aren't you going a bit over the board here ? No need to go mad nor 
scream at us.

(snip usual stuff about lack of access restriction perceived as 
dangerous or whatever - cargo cult, really...).


From google at mrabarnett.plus.com  Mon Feb  2 12:19:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 17:19:38 +0000
Subject: What is wrong in my list comprehension?
In-Reply-To: <873aew24ql.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
Message-ID: <49872B2A.1070204@mrabarnett.plus.com>

J Kenneth King wrote:
> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
>> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> bool(-1)
>> True
>>
>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
> 
> That's an odd little quirk... never noticed that before.
> 
> I just use regular expressions myself.
> 
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.
> 
str.find() returns the index (position) where the substring was found. 
Because string indexes start at 0 the returned value is -1 if it's not 
found.

In those languages where string indexes start at 1 the returned value is 
0 if not found.



From aahz at pythoncraft.com  Mon Feb  2 12:29:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 09:29:43 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
Message-ID: <gm7ai7$ghd$1@panix3.panix.com>

In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>* Aahz (2 Feb 2009 06:30:00 -0800)
>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>aahz at pythoncraft.com (Aahz) writes:
>>>>
>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>
>>>On what basis?
>> 
>> It makes my eyes bleed
>
>Ever tried sunglasses?

Polarized sunglasses don't work too well with LCD monitors
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From deets at nospam.web.de  Mon Feb  2 12:42:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 18:42:07 +0100
Subject: the 'right way' to distribute and access data files in a packaged
	Python module
References: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>
Message-ID: <6uopjfFgd5gdU1@mid.uni-berlin.de>

David Moss wrote:

> Hi,
> 
> I'm the author of netaddr :-
> 
>     http://pypi.python.org/pypi/netaddr/0.6
> 
> For release 0.6 I've added setuptools support so it can be distributed
> as a Python egg package using the easy_install tool.
> 
> In 0.6, I've started bundling some data files from IEEE and IANA with
> the code below the site-packages install path (lib/site-packages/
> netaddr/...). netaddr accesses and parses these files on module load
> to provide various IP and MAC address related information via its API.
> 
> This mechanism works for the setuptools based packages because on
> install they extract to the filesystem and can be accessed using
> something like :-
> 
>     >>> index = open(os.path.join(__file__, 'oui.idx'))
> 
> However, setuptools seems to perform some magic for module imports
> which prevents me from accessing these files directly as they are
> bundled inside an egg (zip) file :-(
> 
> Two questions arise out of this situation :-
> 
> 1) is there a better way to distribute the files, i.e. should I be
> using a different more correct path instead of site-packages for data?
> If so, where is this and how do I add it to my setup scripts and code?
> 
> 2) is there an easy (and portable) way for me to dive inside an egg
> file to access the data I required (ugly but workable). I'm assuming
> I'd need to check for the presence of setuptools available with the
> Python interpreter etc.
> 
> My users and I would be grateful for and help and advice.

There is a zip-safe flag that you can specify that tells setuptools that
installing your egg only works if it is unarchived. However, there is also
the pkg_resources-package that allows you to access streams from within a
package, even if it is zipped. You should investigate these two options.

Diez


From james at agentultra.com  Mon Feb  2 12:43:39 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 17:43:39 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
Message-ID: <87r62gzqd0.fsf@agentultra.com>

Stephen Hansen <apt.shansen at gmail.com> writes:

>>> str.find() returns -1 on failure (i.e. if the substring is not in the
>>> given string).
>>> -1 is considered boolean true by Python.
>>
>> That's an odd little quirk... never noticed that before.
>>
>> I just use regular expressions myself.
>>
>> Wouldn't this be something worth cleaning up? It's a little confusing
>> for failure to evaluate to boolean true even if the relationship isn't
>> direct.
>
> But what would you clean it up to?
>
> str.find can return 0 ... which is a *true* result as that means it
> finds what you're looking for at position 0... but which evaluates to
> boolean False. The fact that it can also return -1 which is the
> *false* result which evaluates to boolean True is just another side of
> that coin.
>
> What's the options to clean it up? It can return None when it doesn't
> match and you can then test str.find("a") is None... but while that
> kinda works it also goes a bit against the point of having boolean
> truth/falsehood not representing success/failure of the function. 0
> (boolean false) still is a success.
>
> Raising an exception would be a bad idea in many cases, too. You can
> use str.index if that's what you want.
>
> So there's not really a great solution to "cleaning it up" . I
> remember there was some talk in py-dev of removing str.find entirely
> because there was no really c, but I have absolutely no idea if they
> ended up doing it or not.
>
> --S

(Sorry all for the multiple post... my gnus fudged a bit there)

That's the funny thing about integers having boolean contexts I
guess. Here's a case where 0 actually isn't "False." Any returned value
should be considered "True" and "None" should evaluate to "False." Then
the method can be used in both contexts of logic and procedure.

(I guess that's how I'd solve it, but I can see that implementing it
is highly improbable)

I'm only curious if it's worth cleaning up because the OP's case is one
where there is more than one way to do it.

However, that's not the way the world is and I suppose smarter people
have discussed this before. If there's a link to the discussion, I'd
like to read it. It's pedantic but fascinating no less.


From tim.arnold at sas.com  Mon Feb  2 12:45:25 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Mon, 2 Feb 2009 12:45:25 -0500
Subject: Using lxml to screen scrap a site, problem with charset
References: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>
Message-ID: <gm7bfl$vf8$1@foggy.unx.sas.com>

"?????? ???????????" <gdamjan at gmail.com> wrote in message 
news:ciqh56-ses.ln1 at archaeopteryx.softver.org.mk...
> So, I'm using lxml to screen scrap a site that uses the cyrillic
> alphabet (windows-1251 encoding). The sites HTML doesn't have the <META
> ..content-type.. charset=..> header, but does have a HTTP header that
> specifies the charset... so they are standards compliant enough.
>
> Now when I run this code:
>
> from lxml import html
> doc = html.parse('http://a1.com.mk/')
> root = doc.getroot()
> title = root.cssselect(('head title'))[0]
> print title.text
>
> the title.text is ? unicode string, but it has been wrongly decoded as
> latin1 -> unicode
>
> So.. is this a deficiency/bug in lxml or I'm doing something wrong.
> Also, what are my other options here?
>
>
> I'm running Python 2.6.1 and python-lxml 2.1.4 on Linux if matters.
>
> -- 
> ?????? ( http://softver.org.mk/damjan/ )
>
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
>

The way I do that is to open the file with codecs, encoding=cp1251, read it 
into variable and feed that to the parser.

--Tim




From eric.shain at gmail.com  Mon Feb  2 12:48:53 2009
From: eric.shain at gmail.com (Eric)
Date: Mon, 2 Feb 2009 09:48:53 -0800 (PST)
Subject: Combining several text files
Message-ID: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>

This is my first post, so please advise if I'm not using proper
etiquette. I've actually searched around a bit and while I think I can
do this, I can't think of a clean elegant way. I'm pretty new to
Python, but from what I've learned so far is that there is almost
always an easier way.

I have to parse several log files. I've already written a working
parser. The log files are simple text files that when they get to a
certain size are renamed to append a number. So, you might end up
with:

filename.log.2
filename.log.1
filename.log

The higher the number, the older the file. I want to search for all
the files in a directory with "filename.log" as part of their name.
Then I can do one of two things. First I could combine them so that
the resulting file ends up with the oldest on top and newest on the
bottom. Otherwise, I could just iterate over the multiple files within
my parser.

I don't need working code (that makes things too easy), just clear
suggestions to a Python newcomer to speed me on my way.

Thanks


From mensanator at aol.com  Mon Feb  2 12:49:48 2009
From: mensanator at aol.com (Mensanator)
Date: Mon, 2 Feb 2009 09:49:48 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com> 
	<81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com> 
	<68b1337a-1938-4765-b28a-dc526dd8e8c1@x6g2000pre.googlegroups.com>
Message-ID: <65936f1b-fd67-4234-b119-aff78babfb7d@t39g2000prh.googlegroups.com>

On Feb 2, 1:01?am, casevh <cas... at gmail.com> wrote:
> On Feb 1, 10:02?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
>
>
> > On Feb 1, 8:20 pm, casevh <cas... at gmail.com> wrote:
>
> > > On Feb 1, 1:04 pm, Mensanator <mensana... at aol.com> wrote:
>
> > > > On Feb 1, 2:27 am, casevh <cas... at gmail.com> wrote:
>
> > > > > On Jan 31, 9:36 pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. At the moment, because of accuracy concerns, I'm doing something like
>
> > > > > > for root in powersp:
> > > > > > nroot = round(bignum**(1.0/root))
> > > > > > if bignum==long(nroot)**root:
> > > > > > .........
> > > > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > > > Tim
>
> > > > > Take a look at gmpy and the is_power function. I think it will do
> > > > > exactly what you want.
>
> > > > And the root function will give you the root AND tell you whether
> > > > it was an integral root:
>
> > > > >>> gmpy.root(a,13)
>
> > > > (mpz(3221), 0)
>
> > > > In this case, it wasn't.
>
> > > I think the original poster wants to know if a large number has an
> > > exact integral root for any exponent. is_power will give you an answer
> > > to that question but won't tell you what the root or exponent is. Once
> > > you know that the number is a perfect power, you can root to find the
> > > root.
>
> > But how do you know what exponent to use?
>
> That's the gotcha. :) You still need to test all prime exponents until
> you find the correct one. But it is much faster to use is_power to
> check whether or not a number has representation as a**b and then try
> all the possible exponents than to just try all the possible exponents
> on all the numbers.

Ok. I was under the impression that the OP was only interested
in the 13th root, so that is_power wouldn't necessarily be of any
use to him. If is_power returned true, you would still have to do
root(a,13) to see if it's actually a 13th power. That's executing
two gmpy functions and takes twice as much time as doing root(a,13)
alone.

>
>
>
>
>
> > > > >http://code.google.com/p/gmpy/
>
> > > > > casevh



From gagsl-py2 at yahoo.com.ar  Mon Feb  2 12:54:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 15:54:27 -0200
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
	<mailman.8612.1233589195.3487.python-list@python.org>
	<rNOSPAMon-ED547A.08101902022009@news.gha.chartermi.net>
Message-ID: <op.uoqj01myx6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 14:10:19 -0200, Ron Garret <rNOSPAMon at flownet.com>  
escribi?:
> In article <mailman.8612.1233589195.3487.python-list at python.org>,
>  "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>>
>> [...] you hit a known bug in cgitb - see
>> http://bugs.python.org/issue4643 for a solution.
>
> Aha!  Thank you!  That explains everything, except this:  why does the
> problem go away when I run under wsgiref and capture the request in a
> global variable?

NLMPI

(If you don't understand the acronym -very likely- ... well, you don't  
miss anything)

-- 
Gabriel Genellina



From kdawg44 at gmail.com  Mon Feb  2 12:59:27 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 12:59:27 -0500
Subject: Refreshing an IE Webpage
In-Reply-To: <5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>
References: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
	<5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>
Message-ID: <5caea3690902020959g2483f1d5oe4c3b8bbf0020823@mail.gmail.com>

Please disregard... I was making it harder than it had to be I think.

The following seems to be running fine.  Whether its doing what I want I
will know in a little bit if the page in my browser times out....


import win32com.client, pythoncom
from time import sleep

ie=win32com.client.Dispatch('internetexplorer.application')

> ie.Visible=0
> ie.Navigate('URL')
> sleep(5)
>
> while True:
>     sleep(240)

        ie.Refresh()

Thanks
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From philip at semanchuk.com  Mon Feb  2 13:03:20 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 2 Feb 2009 13:03:20 -0500
Subject: Calling into Python from a C thread
Message-ID: <52119CC5-1716-40EF-A0E0-570C05BEE4F1@semanchuk.com>

Hi all,
I'm trying call Python from inside of a C thread that's running in a  
Python extension I've written and I am not having much luck. My C  
thread function consists of simply this, and I get a segmentation  
fault from Python:

void start_routine(union sigval foo) {
     PyGILState_STATE gstate;

     gstate = PyGILState_Ensure();

     // Calls to Python code will go here...

     PyGILState_Release(gstate);
};

I added a printf() and can see that the fault happens *after* the call  
to PyGILState_Release(). Apparently I'm monkeying up something  
fundamental in Python, and this is really simple so I must be missing  
something big.

The context is that I'm adding support for mq_notify() to my posix_ipc  
extension. A process can register via mq_notify() to have a new thread  
started when a message appears in a message queue. I've got this  
working when my thread code is pure C, now I'm trying to add a call to  
a user-specified Python function.

Thanks
Philip


From deets at nospam.web.de  Mon Feb  2 13:05:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 19:05:46 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org>
	<6uo5koFg8q28U1@mid.uni-berlin.de>
	<mailman.8610.1233588630.3487.python-list@python.org>
Message-ID: <6uoqvrFgh5oeU1@mid.uni-berlin.de>

> The reason is that I see a level of abstraction that makes it kind of
> irrelevant whether something is run as a process, a thread, a time
> multiplexed mainloop, on one or more processors, wherever or
> whatever - almost like a fractal structure spread across the total
> addressable space - and I would like to use the same rules
> everywhere.  And if there are reasons for forced encapsulation
> *somewhere*, then it is more elegant (to my taste) to allow it
> *everywhere*.  - and conversely, of course.  Hence the rather
> *an der Haare herbeigezogen* (see ** below) argument
> based on the forced restrictions in processors.

Your argument would be valid if *any* of the *languages* implementing
encapsulation would offer that real isolation. None does. So where from
comes the feeling that this must be something a *language* should offer?

Sure one could envision a system where each object is running in it's
micro-process. So far, this hasn't been implemented (to the best of my
knowledge) - so making assertions about the feasibility & robustness for
running as well as for developing are somewhat "airy", don't you think?

> Given this approach, there is no reason whatever for anything
> to mess with any other thing's innards - in fact the less you know
> about it, the more robust and predictable the system becomes.

For a certain, very limited definition of robustness & predictability. 

As much as I like my OS not to go down, it's nothing that helps me to
accomplish my actual goal using it if the software running on top of it
crashes. From this POV, a chain is always only as strong as it's weakest
member. And that might well be one of your encapsulated components. 


> And in embedded processes, there exist things that are time
> critical, that are designed to be used in one way, and no other,
> and that can have serious consequences if messed with- when
> I have started moving the 100 tonne mass, then I *cannot* tolerate
> other code changing my timeouts or speeds or feeds in an arbitrary
> fashion - EXPENSIVE noises will result.

Embedded programming most often even offers the memory protection one needs
to make the "real" encapsulation, due to hardware restrictions.

And even if it did,  it won't help you with memory corruption that occurs in
process. Which is of course a re-iteration of my argument.

Again: the expensive noises haven't been avoided because of encapsulation.
They might be the product of expensive testruns, either by trial-and-error,
or by review. Not by encapsulation.

>> I've seen a lot of programs segfault that are written in C++ with data
>> encapsulation. And also a lot of them that overcame the restrictions the
>> compiler or even runtime in java imposed on them, either by
>> pointer-magic, or through some available backdoors that have been put in
>> place for good reasons.
> 
> I think that segfaulting is basically caused by programming error -
> By the inability of the programmer actually to understand the
> limitations of the compiler to "do what I mean".
> 
> Encapsulation or data hiding will never "cure" that, because
> at best it could move some of the errors from runtime to
> compile time.
> 
> I doubt the "good reasons for backdoors" part - I think that comes
> from a design that has either not been done, or used, at the correct
> level of granularity.
> 
>> So far I haven't seen any argument for forced data encapsulation that
>> went beyond a matter of personal taste. That's fine, but also just that.
> 
> This could be true, and if it is, we are just beating our heads one
> against the other, trying to win non existent prizes for pig-headedness.
> 
> I could also turn that argument around, as well as stating it stronger:
> 
> So far I have not seen any argument in favour of free access to
> the internals of another piece of code that is based on ANY necessity,
> (beside a handwaving "good reasons" ) or that goes beyond a matter
> of personal taste based on a hacker's glee in meddling in somebody
> else's code.

The argument as apparent in Python: ducktyping is used everyday, to all our
benefit. And every piece of code that only works precisely because it was
possible to access the innards of some other piece of code is an example
and a reason to allow it.

You might say that these things are showing a lack of proper design - but
the point is that design is a question of perspective, and a otherwise
useful piece of code is rendered useless because of encapsulation if that
prevents the usage from a new perspective the original author didn't think
of.

That's my stance on this, and as a coder, I want to (re)use code, not work
around it.

Diez


From vincent at vincentdavis.net  Mon Feb  2 13:08:50 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 2 Feb 2009 11:08:50 -0700
Subject: faster scipy.percentileofscore ?
Message-ID: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>

Currently I am using the following:
pgrades = [scipy.percentileofscore(grades,x) for x in grades]

I need the percentile of each number in grades. The problem is that it
takes a long time (a few minutes) because there are 15,000 items in
the list.
does anyone know is there is a faster way?

Thanks
Vincent Davis
720-301-3003


From google at mrabarnett.plus.com  Mon Feb  2 13:11:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 18:11:21 +0000
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <49873749.9070806@mrabarnett.plus.com>

Eric wrote:
 > This is my first post, so please advise if I'm not using proper
 > etiquette. I've actually searched around a bit and while I think I can
 > do this, I can't think of a clean elegant way. I'm pretty new to
 > Python, but from what I've learned so far is that there is almost
 > always an easier way.
 >
 > I have to parse several log files. I've already written a working
 > parser. The log files are simple text files that when they get to a
 > certain size are renamed to append a number. So, you might end up
 > with:
 >
 > filename.log.2
 > filename.log.1
 > filename.log
 >
 > The higher the number, the older the file. I want to search for all
 > the files in a directory with "filename.log" as part of their name.
 > Then I can do one of two things. First I could combine them so that
 > the resulting file ends up with the oldest on top and newest on the
 > bottom. Otherwise, I could just iterate over the multiple files within
 > my parser.
 >
 > I don't need working code (that makes things too easy), just clear
 > suggestions to a Python newcomer to speed me on my way.
 >
My suggestion is to list the filenames, sort them into descending order
by the suffix (converted to an int) (treat an unnumbered filename as one
having the suffix ".0"), and then parse them in the resulting order.


From apt.shansen at gmail.com  Mon Feb  2 13:12:33 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:12:33 -0800
Subject: is python Object oriented??
In-Reply-To: <003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
Message-ID: <7a9c25c20902021012s2bd6bd71lf82310a07a3f194b@mail.gmail.com>

>
> > >  that an underscore convention is
> > > "just as good", (It isn't),
> >
> > Why isn't it?
>
> Because it needs human intervention.
>

Not necessarily at all: that's something that could be checked very readily
with static analysis. Why isn't that a good enough tool if policy isn't
sufficient?

If you scan the code for "<target>._<something>" and target is not "self",
and <something> is not a magic method, then I think that is an encapsulation
error. I don't know that Pylint or the various other flavors of analysis
tools have an option to check for that, but wouldn't adding one be better
then changing the language? That way those who want it get the certainty
that encapsulation is never broken, and those who don't care don't have to
worry about it.


>
> > > that you could crack it if you really
> > > tried, (so what?),
> >
> > Exactly.. so what? WHY is the convention not enough? What REAL
> > situation is there that the lack of *forced* encapsulation but policy
> > based encapsulation not enough?
> >
>
> See human intervention above - and as for
> "real, forced data hiding" - have you ever
> coded anything that produced a segmentation fault?
>

[ snip discussion of processor memory protection ]

That's apples to... potatoes. I'm not opposed to memory protection :)
Segmentation faults and memoy protection are an utterly different thing. One
protects against a programmer accidentally going in and overwriting
something that he shouldn't, when he doesn't even know he's doing it.

The other protects against a programmer *intentionally* and *explicitly*
going into  source code and finding an undocumented internal detail to
*intentionally* change it for some specific purpose.

One stops someone from making a mistake. The other stops someone from doing
something they /intend/ on doing.

(Both may have an impact on someone with malicious intent, but that's a
whole other subject)

--S
P.S. Aiee, this discussion is getting overwhelmingly long. :)
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From clp2 at rebertia.com  Mon Feb  2 13:17:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 10:17:43 -0800
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <50697b2c0902021017t398b9e1fn42e5ac27fdc17da8@mail.gmail.com>

On Mon, Feb 2, 2009 at 9:48 AM, Eric <eric.shain at gmail.com> wrote:
> This is my first post, so please advise if I'm not using proper
> etiquette. I've actually searched around a bit and while I think I can
> do this, I can't think of a clean elegant way. I'm pretty new to
> Python, but from what I've learned so far is that there is almost
> always an easier way.
>
> I have to parse several log files. I've already written a working
> parser. The log files are simple text files that when they get to a
> certain size are renamed to append a number. So, you might end up
> with:
>
> filename.log.2
> filename.log.1
> filename.log
>
> The higher the number, the older the file. I want to search for all
> the files in a directory with "filename.log" as part of their name.
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
>
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

For listing the filenames, you'll want to use os.listdir:
http://docs.python.org/library/os.html#os.listdir

or possibly the `glob` module depending on your needs:
http://docs.python.org/library/glob.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Mon Feb  2 13:18:39 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:18:39 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <87r62gzqd0.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
	<87r62gzqd0.fsf@agentultra.com>
Message-ID: <7a9c25c20902021018m7a4112edv3a282d9b0ba187a5@mail.gmail.com>

>
> I'm only curious if it's worth cleaning up because the OP's case is one
> where there is more than one way to do it.


I just think at this point ".find" is just not the right method to use;
"substring" in "string" is the way to determine what he wants is all.
".find" is useful for when you want the actual position, not when you just
want to determine if there's a match at all. The way I'd clean it is to
remove .find, personally :) I don't remember the outcome of their discussion
on py-dev, and haven't gotten around to loading up Py3 to test it out :)

I s'pose in certain contexts where catching .index's ValueError is too
expensive and just checking vs -1 is faster and speed is important, .find()
can still be useful. I don't do that much text parsing generally, so don't
know.


> However, that's not the way the world is and I suppose smarter people
> have discussed this before. If there's a link to the discussion, I'd
> like to read it. It's pedantic but fascinating no less.


The thread I remember reading was:

http://mail.python.org/pipermail/python-dev/2005-August/055704.html

It sorta digressed at a certain point :)

--S
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From duncan.booth at invalid.invalid  Mon Feb  2 13:21:24 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 2 Feb 2009 18:21:24 GMT
Subject: Membership of multiple items to a list
References: <mailman.8581.1233563066.3487.python-list@python.org>
Message-ID: <Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>

Stephen Hansen <apt.shansen at gmail.com> wrote:

> I'm re-sending this same message as the OpenPGP S/MIME attachment
> format -- just so test if its actually readable by news clients in
> general. I have absolutely no idea. Not touched a news client in years
> and years, as I said. 

It is readable in XNews, but only displays in a fixed pitch font and 
without colours to distinguish the quoted content.


From robert.kern at gmail.com  Mon Feb  2 13:28:37 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 02 Feb 2009 12:28:37 -0600
Subject: faster scipy.percentileofscore ?
In-Reply-To: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
References: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
Message-ID: <gm7e0l$9e3$1@ger.gmane.org>

On 2009-02-02 12:08, Vincent Davis wrote:
> Currently I am using the following:
> pgrades = [scipy.percentileofscore(grades,x) for x in grades]
>
> I need the percentile of each number in grades. The problem is that it
> takes a long time (a few minutes) because there are 15,000 items in
> the list.
> does anyone know is there is a faster way?

from scipy import stats
pgrades = (stats.rankdata(grades)-1) / (len(grades)-1) * 100

You will probably want to ask further scipy questions on the scipy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb  2 13:30:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 02 Feb 2009 10:30:42 -0800
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <TpydnaL8Lun4phrUnZ2dnUVZ_rPinZ2d@pdx.net>

Eric wrote:
> I have to parse several log files....
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
> 
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

Look into the "glob" module to get your name list, and sort the
resulting list appropriately, then you can loop over that list.
Then you can use an iterator (similar to below) to produce lines:

     def source_lines(chronological_filenames):
         for name in chronological_filenames:
             with open(name) as source:
                  for line in source:
                      yield line

Note this uses the with statement to do file closing, so if you are
using an older Python, you may need to write it differently.

You can use this as a source of lines for your parser.

--Scott David Daniels
Scott.Daniels at Acm.Org


From apt.shansen at gmail.com  Mon Feb  2 13:35:28 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:35:28 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>
References: <mailman.8581.1233563066.3487.python-list@python.org>
	<Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>
Message-ID: <7a9c25c20902021035t3377b8di579c540f8a11f9b@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:21 AM, Duncan Booth
<duncan.booth at invalid.invalid>wrote:

> Stephen Hansen <apt.shansen at gmail.com> wrote:
>
> > I'm re-sending this same message as the OpenPGP S/MIME attachment
> > format -- just so test if its actually readable by news clients in
> > general. I have absolutely no idea. Not touched a news client in years
> > and years, as I said.
>
> It is readable in XNews, but only displays in a fixed pitch font and
> without colours to distinguish the quoted content.


Yeah, I gave up. I was hoping to find one common set of settings that worked
in all contexts I use this email account for, but failed :)

Oh well.

Sorry for sending junk. :) And going off-topic here. Ahem.

--S
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From vincent at vincentdavis.net  Mon Feb  2 13:36:18 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 2 Feb 2009 11:36:18 -0700
Subject: faster scipy.percentileofscore ?
In-Reply-To: <gm7e0l$9e3$1@ger.gmane.org>
References: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
	<gm7e0l$9e3$1@ger.gmane.org>
Message-ID: <77e831100902021036k38e14d85l5c57e250e973a79b@mail.gmail.com>

Did not know about http://www.scipy.org/Mailing_Lists but did not look,

Thanks for the help
Vincent Davis




On Mon, Feb 2, 2009 at 11:28 AM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-02 12:08, Vincent Davis wrote:
>>
>> Currently I am using the following:
>> pgrades = [scipy.percentileofscore(grades,x) for x in grades]
>>
>> I need the percentile of each number in grades. The problem is that it
>> takes a long time (a few minutes) because there are 15,000 items in
>> the list.
>> does anyone know is there is a faster way?
>
> from scipy import stats
> pgrades = (stats.rankdata(grades)-1) / (len(grades)-1) * 100
>
> You will probably want to ask further scipy questions on the scipy mailing
> list.
>
>  http://www.scipy.org/Mailing_Lists
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it
> had
>  an underlying truth."
>  -- Umberto Eco
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From lionel.keene at gmail.com  Mon Feb  2 13:36:31 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 10:36:31 -0800 (PST)
Subject: Reading text file with wierd file extension?
Message-ID: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>

Hi Folks, Python newbie here.

I'm trying to open (for reading) a text file with the following
filenaming convension:

"MyTextFile.slc.rsc"

My code is as follows:

Filepath = "C:\\MyTextFile.slc.rsc"
FileH = open(Filepath)

The above throws an IOError exception. On a hunch I changed the
filename (only the filename) and tried again:

Filepath = "C:\\MyTextFile.txt"
FileH = open(Filepath)

The above works well. I am able to open the file and read it's
contents. I assume to read a file in text file "mode" the parameter is
scanned for a ".txt" extension, otherwise the Python runtime doesn't
know what version of "open(...)" to invoke. How do I pass the original
filename (MyTextFile.slc.rsc) and get Python to open it as a text
file? Thanks in advance everyone!


From stef.mientki at gmail.com  Mon Feb  2 13:40:01 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 02 Feb 2009 19:40:01 +0100
Subject: database wrapper ?
In-Reply-To: <50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>
References: <4986289C.3030205@gmail.com>
	<50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>
Message-ID: <49873E01.5060802@gmail.com>

Chris Rebert wrote:
> On Sun, Feb 1, 2009 at 2:56 PM, Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>> hello,
>>
>> Until now I used a simple wrapper around pysqlite and pyodbc to manage my
>> databases.
>> Now I'm looking for a better solution,
>> because I've to support a (for this moment) unknown database,
>> and I'm not the one who will choose the database.
>>
>> Googling, I found SQLalchemy,
>> which looks quit good.
>>
>> But as I only want to choose once,
>> I googled for  "SQLalchemy alternatives",
>> but it didn't find many answers.
>> (Storm / Grok are of no interest, because manipulating the structure of the
>> database is a key issue).
>>
>> Is SQLalchemy the best / most popular database wrapper ?
>> Are there any alternatives ?
>>     
>
> SQLObject is also probably worth looking at -- http://www.sqlobject.org/
>
> Cheers,
> Chris
>
>   
I took a brief look at the alternatives,
but I guess it's difficult to judge, without trying them all,
most information is quit fragmented.

For now, I've the "feeling" the following arguments are valid:
(If I'm telling something completely wrong, someone will correct me ;-)

positive for SQLAlchemy
- SQLObject is obsolete.  Turbo Gears has replaced SQLObject with 
SQLAlchemy.
- SQLAlchemy is better / faster supported than SQLObject.
- SQLAlchemy is faster

positive for SQLObject
- supports Sybase (which is also obsolete, but still used in my environment)

equal for both
- SQLObject is much easier, but if you put Elixer on top of SQLAlchemy, 
you've about the same easy interface.

As we've planned to replace Sybase in the not too far future, the choice 
for me seems clear.

thanks you al,
cheers,
Stef




From kyosohma at gmail.com  Mon Feb  2 13:41:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 10:41:21 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>

On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hi Folks, Python newbie here.
>
> I'm trying to open (for reading) a text file with the following
> filenaming convension:
>
> "MyTextFile.slc.rsc"
>
> My code is as follows:
>
> Filepath = "C:\\MyTextFile.slc.rsc"
> FileH = open(Filepath)
>
> The above throws an IOError exception. On a hunch I changed the
> filename (only the filename) and tried again:
>
> Filepath = "C:\\MyTextFile.txt"
> FileH = open(Filepath)
>
> The above works well. I am able to open the file and read it's
> contents. I assume to read a file in text file "mode" the parameter is
> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> know what version of "open(...)" to invoke. How do I pass the original
> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> file? Thanks in advance everyone!

The extension shouldn't matter. I tried creating a file with the same
extension as yours and Python 2.5.2 opened it and read it no problem.
I tried it in IDLE and with Wing on Windows XP. What are you using?
What's the complete traceback?

Mike


From simon at brunningonline.net  Mon Feb  2 13:52:05 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Mon, 2 Feb 2009 18:52:05 +0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <8c7f10c60902021052t2bb57cd1n5907c22de270e30c@mail.gmail.com>

2009/2/2 Lionel <lionel.keene at gmail.com>:
> Hi Folks, Python newbie here.
>
> I'm trying to open (for reading) a text file with the following
> filenaming convension:
>
> "MyTextFile.slc.rsc"

Some kind of a resource fork, perhaps? Where did the file come from?

Python doesn't do anything magic with filenames, so this must be some
sort of a fileysytem oddity, I think.

-- 
Cheers,
Simon B.


From apt.shansen at gmail.com  Mon Feb  2 13:55:26 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:55:26 -0800
Subject: Reading text file with wierd file extension?
In-Reply-To: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <7a9c25c20902021055t6f3af7a9leca5b58d4e2ca3c2@mail.gmail.com>

>
> The above works well. I am able to open the file and read it's
> contents. I assume to read a file in text file "mode" the parameter is
> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> know what version of "open(...)" to invoke. How do I pass the original
> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> file? Thanks in advance everyone!


Python doesn't care what extension you use: it doesn't even look at it. The
full file name is passed blindly to the base OS.

To open a file in text mode, do open(filename, "r"); it opens in binary if
you do open(filename, "rb"). The filename has no impact on if its text or
binary mode.

There's something else going on here, I think, and you got misdirected from
it. Are you sure you didn't typo the Filepath slightly? Perhaps left off a \
or had a comma instead of a period -- etc? Or that the filename didn't have
some odd character in it that looked like a regular ascii character?

--S
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From mjbuchan at gmail.com  Mon Feb  2 13:55:50 2009
From: mjbuchan at gmail.com (Power Button)
Date: Mon, 2 Feb 2009 10:55:50 -0800 (PST)
Subject: Threading / Queue management
Message-ID: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>

hi there,

I wonder if anyone can help with the following. I have written a
script which polls a server and if it finds and pending orders, it
instantiates an new object (foo) - in a new thread and processes some
data. In the new object (foo), there are also some long running
processes so I am trying to create a thread pool/queue and to push
items onto the queue in the instantiated object (foo). Currently I am
creating the Queue in foo but this means I am starting up 5 new
threads every time I instantiate foo. What I want to be able to do is
create the Queue and start 5 (n) threads when my program starts and
then push items onto the queue in foo.

My question is, how can I create the Queue in my main object and set
the target function for the Thread Constructor to be a function in
foo?

Below is a code snippet if it will help explain more - as I am fairly
new to Python.

Thanks.
M


import os, threading, time
import Queue
class Foo(threading.Thread):

    def __init__(self, record):
        self.mRecord = record
        self.mQueue = None
        threading.Thread.__init__(self)

    def run(self):
	    files = self.getFiles()
	    self.sendFiles(files)
	    #snip

    def getFiles(self):
        #snip
        pass

    def sendFiles(self, files):
        self.mQueue = Queue.Queue()

        for i in range(5):
            t = threading.Thread(target=self.doSend)
            t.setDaemon(False)
            t.start()

         for f in files:
             self.mQueue.put(['ok', f])

        self.mQueue.join()

    def doSend(self):
        flag = 'ok'
        while flag != 'stop':
            flag,item = self.mQueue.get()
            if flag == 'ok':
                self.sendIt(item)

            self.mQueue.task_done()

    def sendIt(self, item):
        #snip
        pass


import sys, traceback, time
from modules.foo import Foo
from modules.bar import Bar
class Server(object):

    def startPolling(self):
        while True:
            bar = Bar(accessKey)
            pending = None
            pending = bar.getPending()

            if pending != None:
                self. processRecord(bar)
            time.sleep(10)


    def processRecord(self, record):
        Foo(record).start()



def main():
    server = Server()
    server.startPolling()

if __name__ == '__main__':
    main()


From Scott.Daniels at Acm.Org  Mon Feb  2 14:13:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 02 Feb 2009 11:13:32 -0800
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <mailman.8574.1233560394.3487.python-list@python.org>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>	<glo9ns$flv$1@zinnia.noc.ucla.edu>	<497FAFE4.4040602@gmail.com>	<83900549676010b8244969ece9319a78@preisshare.net>	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
	<mailman.8574.1233560394.3487.python-list@python.org>
Message-ID: <WdmdnQq_EoTz2BrUnZ2dnUVZ_rfinZ2d@pdx.net>

Gabriel Rossetti wrote:
> ...
> Well, isn't tkinter being removed? 
> (http://www.python.org/dev/peps/pep-3108/)
To quote the referenced PEP:
     Rejected Ideas
     Modules that were originally suggested for removal
     ...
     * Tkinter
           o Would prevent IDLE from existing.
           o No GUI toolkit would be available out of the box.


--Scott David Daniels
Scott.Daniels at Acm.Org


From lionel.keene at gmail.com  Mon Feb  2 14:20:17 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 11:20:17 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
Message-ID: <fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>

On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hi Folks, Python newbie here.
>
> > I'm trying to open (for reading) a text file with the following
> > filenaming convension:
>
> > "MyTextFile.slc.rsc"
>
> > My code is as follows:
>
> > Filepath = "C:\\MyTextFile.slc.rsc"
> > FileH = open(Filepath)
>
> > The above throws an IOError exception. On a hunch I changed the
> > filename (only the filename) and tried again:
>
> > Filepath = "C:\\MyTextFile.txt"
> > FileH = open(Filepath)
>
> > The above works well. I am able to open the file and read it's
> > contents. I assume to read a file in text file "mode" the parameter is
> > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > know what version of "open(...)" to invoke. How do I pass the original
> > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > file? Thanks in advance everyone!
>
> The extension shouldn't matter. I tried creating a file with the same
> extension as yours and Python 2.5.2 opened it and read it no problem.
> I tried it in IDLE and with Wing on Windows XP. What are you using?
> What's the complete traceback?
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Hi Mike,

maybe it's not a "true" text file? Opening it in Microsoft Notepad
gives an unformatted view of the file (text with no line wrapping,
just the end-of-line square box character followed by more text, end-
of-line character, etc). Wordpad opens it properly i.e. respects the
end-of-line wrapping. I'm unsure of how these files are being
generated, I was just given them and told they wanted to be able to
read them.

How do I collect the traceback to post it?


From lionel.keene at gmail.com  Mon Feb  2 14:21:54 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 11:21:54 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <56eb8d9c-893a-45fc-8961-9296dea287f7@g1g2000pra.googlegroups.com>

On Feb 2, 11:20?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hi Folks, Python newbie here.
>
> > > I'm trying to open (for reading) a text file with the following
> > > filenaming convension:
>
> > > "MyTextFile.slc.rsc"
>
> > > My code is as follows:
>
> > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > FileH = open(Filepath)
>
> > > The above throws an IOError exception. On a hunch I changed the
> > > filename (only the filename) and tried again:
>
> > > Filepath = "C:\\MyTextFile.txt"
> > > FileH = open(Filepath)
>
> > > The above works well. I am able to open the file and read it's
> > > contents. I assume to read a file in text file "mode" the parameter is
> > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > know what version of "open(...)" to invoke. How do I pass the original
> > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > file? Thanks in advance everyone!
>
> > The extension shouldn't matter. I tried creating a file with the same
> > extension as yours and Python 2.5.2 opened it and read it no problem.
> > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > What's the complete traceback?
>
> > Mike- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Mike,
>
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.
>
> How do I collect the traceback to post it?- Hide quoted text -
>
> - Show quoted text -

Sorry, I forgot to mention I'm using Python 2.5 and the Python IDLE.


From dmp1991 at gmail.com  Mon Feb  2 14:24:38 2009
From: dmp1991 at gmail.com (Dave Peterson)
Date: Mon, 2 Feb 2009 11:24:38 -0800 (PST)
Subject: Python package Management GUI - New Project on Sourceforge
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com> 
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com> 
	<mailman.8568.1233550751.3487.python-list@python.org>
Message-ID: <014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>

On Feb 1, 10:57?pm, David Lyon <david.l... at preisshare.net> wrote:
> > What's wrong with Enstaller from Enthought ?
>
> for a start....
>
> onhttps://svn.enthought.com/enthought/wiki/Enstaller
>
> it claims to be depracated...

Hello,

Actually it was version 2.x and earlier that was deprecated and we
just hadn't updated that wiki page in a long time.  Thanks for
pointing that out!  I've now updated it with a bit of news at the
top.  In short Enstaller 3.x is alive and well and available from
PyPi.

We had the downtime for exactly the reason pointed out on this thread
-- which is that we found the old code to be extremely unstable as
users updated any of the dependencies on which Enstaller depended --
things such as wxPython, Traits, etc.

As of now, Enstaller 3.x is a command-line only tool but it does
provide a lot of benefits over standard setuptools -- uninstall,
update/upgrade command, found eggs aren't pre-pended to the full
sys.path but instead inserted before the containing directory, etc.
Our vision for re-implementing the GUI is to provide it via a web-
based frontend as (a) the basic libraries for that ARE included in the
standard lib and (b) we figure more people have a working web browser
than have the Python bindings to any one of various widget libraries
installed.

We'd welcome others to the project if anyone would like to help out!
Just contact us at info at enthought.com for procedures on getting repo
privileges.


From deets at nospam.web.de  Mon Feb  2 14:28:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 20:28:07 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <6uovq7FghiorU1@mid.uni-berlin.de>

> Hi Mike,
> 
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.


Sounds like a unix-line-ended textfile. Python has no problems reading 
these, and frankly I'm a bit wondering why you have that IOError -but 
then, on windows *anything* is possible.

You can try to open the file using the "rb" flag, which opens it in binary.

However, Python doesn't care about any extensions, that must be 
something else you did different.

 > How do I collect the traceback to post it?

Copy and paste from the console or wherever you run the script?

Diez


From tcp at mac.com  Mon Feb  2 14:28:19 2009
From: tcp at mac.com (Ted Pollari)
Date: Mon, 02 Feb 2009 11:28:19 -0800
Subject: Financial aid for PyCon 2009 is now available
Message-ID: <AE61720E-FFE3-4F2B-9BFE-B32E7FC5C0CC@mac.com>

I'm happy to announce that the Python Software Foundation has  
allocated some funds to help people attend PyCon 2009!

If you would like to come to PyCon but can't afford it, the PSF may be  
able to help you pay for registration, lodging/hotel costs and  
transportation (flight etc.). Please see http://us.pycon.org/2009/registration/financial-aid/ 
  for full details, or email pycon-aid at python.org with questions.






From tpollari at gmail.com  Mon Feb  2 14:28:41 2009
From: tpollari at gmail.com (ted)
Date: Mon, 2 Feb 2009 11:28:41 -0800 (PST)
Subject: Financial aid for PyCon 2009 is now available
Message-ID: <73639627-b579-4d0c-a6e3-68442fa16414@p36g2000prp.googlegroups.com>

I'm happy to announce that the Python Software Foundation has
allocated some funds to help people attend PyCon 2009!

If you would like to come to PyCon but can't afford it, the PSF may be
able to help you pay for registration, lodging/hotel costs and
transportation (flight etc.). Please see http://us.pycon.org/2009/registration/financial-aid/
for full details, or email pycon-aid at python.org with any questions.



From aahz at pythoncraft.com  Mon Feb  2 14:42:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 11:42:10 -0800
Subject: Where to put configuration/data files
References: <mailman.7995.1232937535.3487.python-list@python.org>
Message-ID: <gm7iai$al3$1@panix3.panix.com>

In article <mailman.7995.1232937535.3487.python-list at python.org>,
Jay Bloodworth  <jbloodworth at sc.rr.com> wrote:
>
>Is there a nice cross-platform way to figure out the Right (tm) place to
>store configuration files and other data?

For what purpose?  Global program config, user config, what?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From eric.shain at gmail.com  Mon Feb  2 14:45:20 2009
From: eric.shain at gmail.com (Eric)
Date: Mon, 2 Feb 2009 11:45:20 -0800 (PST)
Subject: Combining several text files
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
	<mailman.8623.1233598671.3487.python-list@python.org>
Message-ID: <5e8c1433-f1d5-4242-bc64-24d02725a79b@z28g2000prd.googlegroups.com>

On Feb 2, 12:17?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 2, 2009 at 9:48 AM, Eric <eric.sh... at gmail.com> wrote:
> > This is my first post, so please advise if I'm not using proper
> > etiquette. I've actually searched around a bit and while I think I can
> > do this, I can't think of a clean elegant way. I'm pretty new to
> > Python, but from what I've learned so far is that there is almost
> > always an easier way.
>
> > I have to parse several log files. I've already written a working
> > parser. The log files are simple text files that when they get to a
> > certain size are renamed to append a number. So, you might end up
> > with:
>
> > filename.log.2
> > filename.log.1
> > filename.log
>
> > The higher the number, the older the file. I want to search for all
> > the files in a directory with "filename.log" as part of their name.
> > Then I can do one of two things. First I could combine them so that
> > the resulting file ends up with the oldest on top and newest on the
> > bottom. Otherwise, I could just iterate over the multiple files within
> > my parser.
>
> > I don't need working code (that makes things too easy), just clear
> > suggestions to a Python newcomer to speed me on my way.
>
> For listing the filenames, you'll want to use os.listdir:http://docs.python.org/library/os.html#os.listdir
>
> or possibly the `glob` module depending on your needs:http://docs.python.org/library/glob.html
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

That wasn't too hard at all. I even found the construct:

logfile = [elem for elem in files if elem.find(ln) >= 0]

For my own interest, is there an easy way once I have the file names
to create a single concatenated file?

Thanks,

Eric


From mdw at distorted.org.uk  Mon Feb  2 14:50:33 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Mon, 02 Feb 2009 19:50:33 +0000
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <877i48obxy.fsf.mdw@metalzone.distorted.org.uk>

Jon Clements <joncle at googlemail.com> writes:

> "The int() type gained a bit_length method that returns the number of
> bits necessary to represent its argument in binary:"
>
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.

def nbits(x):

  ## Special cases.
  if x == 0: return 0
  elif x < 0: x = -x

  ## Find upper bound of the form 2^(2^n) >= x.
  n = 1
  while True:
    y = x >> n
    if y == 0: break
    x = y
    n <<= 1

  ## Now binary search until we're done.
  a = n
  while n > 0:
    n >>= 1
    y = x >> n
    if y > 0:
      x = y
      a += n

  return a


-- [mdw]


From rdmurray at bitdance.com  Mon Feb  2 14:55:37 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 19:55:37 +0000 (UTC)
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
	<87r62gzqd0.fsf@agentultra.com>
	<7a9c25c20902021018m7a4112edv3a282d9b0ba187a5@mail.gmail.com>
Message-ID: <gm7j3p$s9q$1@ger.gmane.org>

Quoth Stephen Hansen <apt.shansen at gmail.com>:
> I just think at this point ".find" is just not the right method to use;
> "substring" in "string" is the way to determine what he wants is all.
> ".find" is useful for when you want the actual position, not when you just
> want to determine if there's a match at all. The way I'd clean it is to
> remove .find, personally :) I don't remember the outcome of their discussion
> on py-dev, and haven't gotten around to loading up Py3 to test it out :)


Python 3.0 (r30:67503, Dec 18 2008, 19:09:30) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> help(''.find)
Help on built-in function find:

find(...)
    S.find(sub[, start[, end]]) -> int
    
    Return the lowest index in S where substring sub is found,
    such that sub is contained within s[start:end].  Optional
    arguments start and end are interpreted as in slice notation.
    
    Return -1 on failure.




From kyosohma at gmail.com  Mon Feb  2 15:10:17 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 12:10:17 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>

On Feb 2, 1:20?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
>
>
> > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hi Folks, Python newbie here.
>
> > > I'm trying to open (for reading) a text file with the following
> > > filenaming convension:
>
> > > "MyTextFile.slc.rsc"
>
> > > My code is as follows:
>
> > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > FileH = open(Filepath)
>
> > > The above throws an IOError exception. On a hunch I changed the
> > > filename (only the filename) and tried again:
>
> > > Filepath = "C:\\MyTextFile.txt"
> > > FileH = open(Filepath)
>
> > > The above works well. I am able to open the file and read it's
> > > contents. I assume to read a file in text file "mode" the parameter is
> > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > know what version of "open(...)" to invoke. How do I pass the original
> > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > file? Thanks in advance everyone!
>
> > The extension shouldn't matter. I tried creating a file with the same
> > extension as yours and Python 2.5.2 opened it and read it no problem.
> > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > What's the complete traceback?
>
> > Mike- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Mike,
>
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.
>
> How do I collect the traceback to post it?

The traceback should look something like this fake one:

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    raise IOError
IOError

Just copy and paste it in your next message. The other guys are
probably right in that it is a line ending issue, but as they and I
have said, Python shouldn't care (and doesn't on my machine).

Mike


From rdmurray at bitdance.com  Mon Feb  2 15:18:30 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 20:18:30 +0000 (UTC)
Subject: Combining several text files
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <gm7kel$325$1@ger.gmane.org>

Quoth Eric <eric.shain at gmail.com>:
> This is my first post, so please advise if I'm not using proper
> etiquette. I've actually searched around a bit and while I think I can
> do this, I can't think of a clean elegant way. I'm pretty new to
> Python, but from what I've learned so far is that there is almost
> always an easier way.
> 
> I have to parse several log files. I've already written a working
> parser. The log files are simple text files that when they get to a
> certain size are renamed to append a number. So, you might end up
> with:
> 
> filename.log.2
> filename.log.1
> filename.log
> 
> The higher the number, the older the file. I want to search for all
> the files in a directory with "filename.log" as part of their name.
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
> 
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

My first thought would be to do something like this (assuming
you are on a unix variant):

    yourscript `ls -tr filename.log*`

and then in 'yourscript' do:

    import fileinput
    for line in fileinput.input():
        #process the lines

This has the nice advantage of giving you access to the source filename
and line number within its source file of each line, in case that
is useful.

This is an example of why Python is referred to as "Batteries Included" :)

--RDM



From callen314 at gmail.com  Mon Feb  2 15:21:07 2009
From: callen314 at gmail.com (Craig Allen)
Date: Mon, 2 Feb 2009 12:21:07 -0800 (PST)
Subject: Does the Python community really follow the philospy of 
	"Community Matters?"
References: <15bc25c2-4fa7-4efa-aa66-7c403acb3cc5@f29g2000vbf.googlegroups.com>
	<2d459946-2216-42f7-87f8-9f0cde1fd060@l16g2000yqo.googlegroups.com> 
	<mailman.8346.1233294797.3487.python-list@python.org>
	<bdba45e4-d6a2-4479-b164-b4ef7ff75a7c@l37g2000vba.googlegroups.com>
Message-ID: <1580d92d-602b-4eb2-acce-3c33a3ee2301@b38g2000prf.googlegroups.com>

I think what you have found is a remarkable characteristic of this
language.  Somehow, perhaps something to do with guido or python
itself, python has a very strong non-dogmatic streak.  It's a relief
really.  If I were to pose a "is python or its community really xyz?"
I would wonder about the "one best way to do something".  One of my
first posts here was about three different ways I had built
singletons. As a result of that I was given a better way, but no one
said any of the other ways were "non-pythonic", it was more, "if you
use option one, make sure of this, if you use option two, don't forget
that"...

As such, python programmers are not there for you to feel superior.
If you want a language for a feeling of community, then it hardly
matters what language you choose, and if you want a good language,
it's secondary if the community gives you that feeling (you should get
it from the language itself).  And since there IS a python community
to go to for help, python has that covered without worrying about it
or making it a language feature.  It may seems cold, instead of giving
warm fuzzies, people will help you with tangible problems, but we are
not starting a commune.  "Uses a langague with sense of community that
advocates  for their language over others" is never in a spec.


-craig


From jervisau at gmail.com  Mon Feb  2 15:30:52 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Tue, 3 Feb 2009 07:30:52 +1100
Subject: Comparing dates?
In-Reply-To: <65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>
Message-ID: <8e63a5ce0902021230y74718b71rb8b33b784534d92b@mail.gmail.com>

> Most
> will have functions like str[pf]time that could be used to similar
> effect.

In mysql this is:
str_to_date( '21/02/2008',  '%d/%m/%Y')

and oracle:
to_date( '21/02/2008',  'dd-mm-yyyy')

Cheers,


From lionel.keene at gmail.com  Mon Feb  2 15:33:36 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 12:33:36 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
Message-ID: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>

On Feb 2, 12:10?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 1:20?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
> > > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Hi Folks, Python newbie here.
>
> > > > I'm trying to open (for reading) a text file with the following
> > > > filenaming convension:
>
> > > > "MyTextFile.slc.rsc"
>
> > > > My code is as follows:
>
> > > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > > FileH = open(Filepath)
>
> > > > The above throws an IOError exception. On a hunch I changed the
> > > > filename (only the filename) and tried again:
>
> > > > Filepath = "C:\\MyTextFile.txt"
> > > > FileH = open(Filepath)
>
> > > > The above works well. I am able to open the file and read it's
> > > > contents. I assume to read a file in text file "mode" the parameter is
> > > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > > know what version of "open(...)" to invoke. How do I pass the original
> > > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > > file? Thanks in advance everyone!
>
> > > The extension shouldn't matter. I tried creating a file with the same
> > > extension as yours and Python 2.5.2 opened it and read it no problem.
> > > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > > What's the complete traceback?
>
> > > Mike- Hide quoted text -
>
> > > - Show quoted text -
>
> > Hi Mike,
>
> > maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > gives an unformatted view of the file (text with no line wrapping,
> > just the end-of-line square box character followed by more text, end-
> > of-line character, etc). Wordpad opens it properly i.e. respects the
> > end-of-line wrapping. I'm unsure of how these files are being
> > generated, I was just given them and told they wanted to be able to
> > read them.
>
> > How do I collect the traceback to post it?
>
> The traceback should look something like this fake one:
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? raise IOError
> IOError
>
> Just copy and paste it in your next message. The other guys are
> probably right in that it is a line ending issue, but as they and I
> have said, Python shouldn't care (and doesn't on my machine).
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Okay, I think I see what's going on. My class takes a single parameter
when it is instantiated...the file path of the data file the user
wants to open. This is of the form "someFile.slc". In the same
directory of "someFile.slc" is a resource file that (like a file
header) contains a host of parameters associated with the data file.
The resource file is of the form "someFile.slc.rsc". So, when the user
creates an instance of my class which, it invokes the __init__ method
where I add the ".rsc" extension to the original filename/path
parameter that was passed to the class "constructor". For example:

Note: try-catch blocks ommitted.

class MyUtilityClass:
    def __init__(self, DataFilepath):
        Resourcepath  = DataFilepath + ".rsc"
        DataFileH     = open(DataFilepath)
        ResourceFileH = open(Resourcepath)


Invoking this from the Python shell explicitly is no problem i.e.
"TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
is lost when I append the ".rsc" extension to the DataFilePath
parameter as above. When the __init__ method is invoked, Python will
open the data file but generates the exception with the "open
(Resourcepath)" instruction. I think it is somehow related to the
backslashes but I'm not entirely sure of this. Any ideas?

Thanks for the help folks.


From vicente.soler at gmail.com  Mon Feb  2 15:46:34 2009
From: vicente.soler at gmail.com (vsoler)
Date: Mon, 2 Feb 2009 12:46:34 -0800 (PST)
Subject: Source code for csv module
Message-ID: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>

Hi you all,

I just discovered the csv module here in the comp.lang.python group.

I have found its manual, which is publicly available, but since I am
still a newby, learning techniques, I was wondering if the source code
for this module is available.

Is it possible to have a look at it?

Thanks


From joncle at googlemail.com  Mon Feb  2 15:51:13 2009
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 2 Feb 2009 12:51:13 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
Message-ID: <55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>

On 2 Feb, 20:46, vsoler <vicente.so... at gmail.com> wrote:
> Hi you all,
>
> I just discovered the csv module here in the comp.lang.python group.
>
> I have found its manual, which is publicly available, but since I am
> still a newby, learning techniques, I was wondering if the source code
> for this module is available.
>
> Is it possible to have a look at it?
>
> Thanks

The csv module is a wrapper around a C extension. If you're happy
reading C code then downloading the Python sources will let you take a
goosey.

Jon.


From andrew at acooke.org  Mon Feb  2 15:53:00 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 2 Feb 2009 12:53:00 -0800 (PST)
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
Message-ID: <6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>

On Feb 1, 8:45?pm, a... at pythoncraft.com (Aahz) wrote:
> [...]?I for one won't participate in any list hosted on
> Google because of the need for a Google login.

hi,  just fyi, i investigated this and you can join any publicly
readable group by sending an email to the "-subscribe" address.  you
do not need a google login for this and, as far as i can tell, it then
operates for you like a normal mailing list.

for example, to subscribe to the group foo, you would send an email to
foo-subscribe at googlegroups.com.  to unsubscribe, use foo-
unsubscribe at googlegroups.com.

this isn't exactly well-publicised, but i tested it and it does work.

andrew


From dickinsm at gmail.com  Mon Feb  2 15:57:13 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Mon, 2 Feb 2009 12:57:13 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <8375c702-75f7-4bcc-85bb-068828af6a6d@f40g2000pri.googlegroups.com>

On Jan 31, 7:03?am, Jon Clements <jon... at googlemail.com> wrote:
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.

It's a bit cheeky, but:

from decimal import _nbits as nbits

should also work in 2.5.2 (but not in 2.5.1)!

Mark




From vicente.soler at gmail.com  Mon Feb  2 15:57:39 2009
From: vicente.soler at gmail.com (vsoler)
Date: Mon, 2 Feb 2009 12:57:39 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>
Message-ID: <598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com>

On 2 feb, 21:51, Jon Clements <jon... at googlemail.com> wrote:
> On 2 Feb, 20:46, vsoler <vicente.so... at gmail.com> wrote:
>
> > Hi you all,
>
> > I just discovered the csv module here in the comp.lang.python group.
>
> > I have found its manual, which is publicly available, but since I am
> > still a newby, learning techniques, I was wondering if the source code
> > for this module is available.
>
> > Is it possible to have a look at it?
>
> > Thanks
>
> The csv module is a wrapper around a C extension. If you're happy
> reading C code then downloading the Python sources will let you take a
> goosey.
>
> Jon.

I'm still interested in learning python techniques. Are there any
other modules (standard or complementary) that I can use in my
education?


From python.list at tim.thechases.com  Mon Feb  2 15:58:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 02 Feb 2009 14:58:15 -0600
Subject: Source code for csv module
In-Reply-To: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
Message-ID: <49875E67.2090703@tim.thechases.com>

> I just discovered the csv module here in the comp.lang.python
> group.

It certainly makes life easier.

> I have found its manual, which is publicly available, but
> since I am still a newby, learning techniques, I was wondering
> if the source code for this module is available.
> 
> Is it possible to have a look at it?

Yep...the source csv.py is likely already on your computer:

   >>> import csv
   >>> csv.__file__
   '/usr/lib/python2.5/csv.pyc'
   tchase at asgix2:~$ ls /usr/lib/python2.5/csv.*
   /usr/lib/python2.5/csv.py  /usr/lib/python2.5/csv.pyc


Same idea in Windows:

   >>> import csv
   >>> csv.__file__
   'C:\\Program Files\\Python24\\lib\\csv.pyc'
   c:\> dir "\Program Files\Python24\lib\csv.*"
   ...

Just about all the modules in the standard library have python 
source in this same directory, so you can spelunk within.

-tkc







From david.lyon at preisshare.net  Mon Feb  2 15:58:22 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 02 Feb 2009 15:58:22 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<mailman.8568.1233550751.3487.python-list@python.org>
	<014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>
Message-ID: <38eb2cc708c7252ef55aca51a4b74edb@preisshare.net>

Hi Dave,

> As of now, Enstaller 3.x is a command-line only tool but it does
> provide a lot of benefits over standard setuptools -- uninstall,
> update/upgrade command, found eggs aren't pre-pended to the full
> sys.path but instead inserted before the containing directory, etc.

Sounds extremely powerful.

Maye I should be looking at offering support for driving Enstaller
to the GUI tool. I think I will...

Regards

David



From martin at marcher.name  Mon Feb  2 16:00:53 2009
From: martin at marcher.name (Martin)
Date: Mon, 2 Feb 2009 22:00:53 +0100
Subject: [2.5.1] Comparing dates?
In-Reply-To: <5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
Message-ID: <5fa6c12e0902021300u6e2d774egd8ab5c297c47bb59@mail.gmail.com>

Hi,

2009/2/2 Gilles Ganault <nospam at nospam.com>:
> Thanks guys. For those interested, here's how to perform the
> conversion from DD/MM/YYYY to YYYY-MM-DD:

as suggested, the DBA should seriously think about defining the
correct type of the column here, for intermediate use and getting
stuff to work you could use a view and define some stored procedures
on it so that inserting properly works...

---snip plain psql---
test=# CREATE table date_test(
  id serial primary key,
  the_date timestamp with time zone,
  stuff Text
);
NOTICE:  CREATE TABLE will create implicit sequence "date_test_id_seq"
for serial column "date_test.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index
"date_test_pkey" for table "date_test"
CREATE TABLE
test=# INSERT INTO date_test (the_date) VALUES ('20091231');
INSERT 0 1
test=# INSERT INTO date_test (the_date) VALUES ('20081231');
INSERT 0 1
test=# INSERT INTO date_test (the_date) VALUES ('20071231');
INSERT 0 1
test=# SELECT * from date_test;
 id |        the_date        | stuff
----+------------------------+-------
  1 | 2009-12-31 00:00:00+01 |
  2 | 2008-12-31 00:00:00+01 |
  3 | 2007-12-31 00:00:00+01 |
(3 rows)
---snap plain psql---

---snip now in python---
from datetime import datetime
d = datetime(day=21, month=21, year=2008) # use a real datetime
without string fiddling
import psycopg2
db = psycopg2.connect(host='localhost', user='test', password='test',
database='test')
cursor = db.cursor()
cursor.execute("select * from date_test where the_date < '20080221'")
# OK simple SELECT
for row in cursor:
  print row
# (3, datetime.datetime(2007, 12, 31, 0, 0,
tzinfo=<psycopg2.tz.FixedOffsetTimezone object at 0x959fe0c>), None)
## kill SQL injection stuff, also personally I find this more
convenient that fiddling with strings...
cursor.execute("select * from date_test where the_date < %s", (d, ))
for row in cursor:
  print row
(3, datetime.datetime(2007, 12, 31, 0, 0,
tzinfo=<psycopg2.tz.FixedOffsetTimezone object at 0x959fe8c>), None)
---snap now in python---



-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From deets at nospam.web.de  Mon Feb  2 16:07:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 22:07:23 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
Message-ID: <6up5kbFglf13U1@mid.uni-berlin.de>

Lionel schrieb:
> On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>>
>>
>>
>>
>>
>>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
>>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
>>>>> Hi Folks, Python newbie here.
>>>>> I'm trying to open (for reading) a text file with the following
>>>>> filenaming convension:
>>>>> "MyTextFile.slc.rsc"
>>>>> My code is as follows:
>>>>> Filepath = "C:\\MyTextFile.slc.rsc"
>>>>> FileH = open(Filepath)
>>>>> The above throws an IOError exception. On a hunch I changed the
>>>>> filename (only the filename) and tried again:
>>>>> Filepath = "C:\\MyTextFile.txt"
>>>>> FileH = open(Filepath)
>>>>> The above works well. I am able to open the file and read it's
>>>>> contents. I assume to read a file in text file "mode" the parameter is
>>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
>>>>> know what version of "open(...)" to invoke. How do I pass the original
>>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
>>>>> file? Thanks in advance everyone!
>>>> The extension shouldn't matter. I tried creating a file with the same
>>>> extension as yours and Python 2.5.2 opened it and read it no problem.
>>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
>>>> What's the complete traceback?
>>>> Mike- Hide quoted text -
>>>> - Show quoted text -
>>> Hi Mike,
>>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
>>> gives an unformatted view of the file (text with no line wrapping,
>>> just the end-of-line square box character followed by more text, end-
>>> of-line character, etc). Wordpad opens it properly i.e. respects the
>>> end-of-line wrapping. I'm unsure of how these files are being
>>> generated, I was just given them and told they wanted to be able to
>>> read them.
>>> How do I collect the traceback to post it?
>> The traceback should look something like this fake one:
>>
>> Traceback (most recent call last):
>>   File "<pyshell#3>", line 1, in <module>
>>     raise IOError
>> IOError
>>
>> Just copy and paste it in your next message. The other guys are
>> probably right in that it is a line ending issue, but as they and I
>> have said, Python shouldn't care (and doesn't on my machine).
>>
>> Mike- Hide quoted text -
>>
>> - Show quoted text -
> 
> Okay, I think I see what's going on. My class takes a single parameter
> when it is instantiated...the file path of the data file the user
> wants to open. This is of the form "someFile.slc". In the same
> directory of "someFile.slc" is a resource file that (like a file
> header) contains a host of parameters associated with the data file.
> The resource file is of the form "someFile.slc.rsc". So, when the user
> creates an instance of my class which, it invokes the __init__ method
> where I add the ".rsc" extension to the original filename/path
> parameter that was passed to the class "constructor". For example:
> 
> Note: try-catch blocks ommitted.
> 
> class MyUtilityClass:
>     def __init__(self, DataFilepath):
>         Resourcepath  = DataFilepath + ".rsc"
>         DataFileH     = open(DataFilepath)
>         ResourceFileH = open(Resourcepath)
> 
> 
> Invoking this from the Python shell explicitly is no problem i.e.
> "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> is lost when I append the ".rsc" extension to the DataFilePath
> parameter as above. When the __init__ method is invoked, Python will
> open the data file but generates the exception with the "open
> (Resourcepath)" instruction. I think it is somehow related to the
> backslashes but I'm not entirely sure of this. Any ideas?

This is written very slowly, so you can read it better:

Please post the traceback.

Diez


From martin at marcher.name  Mon Feb  2 16:09:18 2009
From: martin at marcher.name (Martin)
Date: Mon, 2 Feb 2009 22:09:18 +0100
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
References: <4986289C.3030205@gmail.com>
Message-ID: <5fa6c12e0902021309v8743e59v6413ce9bd7894dcd@mail.gmail.com>

Hi,

2009/2/1 Stef Mientki <stef.mientki at gmail.com>:
> Googling, I found SQLalchemy,
> which looks quit good.

sqlalchemy was always enough for my needs, I recently found elixir
which is yet another wrapper around sqlalchemy. I haven't played too
much with it but it seems there are a couple of nice things, that is
elixir makes using sqlalchemy even easier.

hth
martin


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From steve at holdenweb.com  Mon Feb  2 16:18:22 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 16:18:22 -0500
Subject: Threading / Queue management
In-Reply-To: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <gm7nuu$fgq$1@ger.gmane.org>

Power Button wrote:
> hi there,
> 
> I wonder if anyone can help with the following. I have written a
> script which polls a server and if it finds and pending orders, it
> instantiates an new object (foo) - in a new thread and processes some
> data. In the new object (foo), there are also some long running
> processes so I am trying to create a thread pool/queue and to push
> items onto the queue in the instantiated object (foo). Currently I am
> creating the Queue in foo but this means I am starting up 5 new
> threads every time I instantiate foo. What I want to be able to do is
> create the Queue and start 5 (n) threads when my program starts and
> then push items onto the queue in foo.
> 
> My question is, how can I create the Queue in my main object and set
> the target function for the Thread Constructor to be a function in
> foo?
> 
This might help.

http://www.chrisarndt.de/projects/threadpool/

If not, Google around for "Python threadpool". If that doesn't help
either, come back to the list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From apt.shansen at gmail.com  Mon Feb  2 16:29:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 13:29:55 -0800
Subject: Reading text file with wierd file extension?
In-Reply-To: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
Message-ID: <7a9c25c20902021329y4d25d597v652410b4a185f728@mail.gmail.com>

> class MyUtilityClass:
>    def __init__(self, DataFilepath):
>        Resourcepath  = DataFilepath + ".rsc"
>        DataFileH     = open(DataFilepath)
>        ResourceFileH = open(Resourcepath)


There's nothing wrong with this code. You have to look elsewhere in your
program-- perhaps what calls it. Perhaps in the filesystem to ensure there
really happens to be a rsc for this data file (maybe it got accidentally
deleted?)

Before you do any openings, try printing like:

print repr(DataFilepath)
print repr(Resourcepath)
print os.path.exists(Resourcepath)
print os.listdir(os.dirname(Resourcepath))

Something must jump out at that point to be obviously the problem. If not
and you still get a traceback, try mailing the list the output and the
actual traceback.

--S
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From sjmachin at lexicon.net  Mon Feb  2 16:36:22 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 13:36:22 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>

On Feb 3, 6:50?am, Mark Wooding <m... at distorted.org.uk> wrote:
> Jon Clements <jon... at googlemail.com> writes:
> > "The int() type gained a bit_length method that returns the number of
> > bits necessary to represent its argument in binary:"
>
> > Any tips on how to get this in 2.5.2 as that's the production version
> > I'm stuck with.
>
> def nbits(x):
>
> ? ## Special cases.
> ? if x == 0: return 0
> ? elif x < 0: x = -x

3 can be represented in 2 bits and at the same time -3 can be
represented in 2 bits?? But 2 bits can support only 2 ** 2 == 4
different possibilities, and -3 .. 3 is 7 different integers.

> ? ## Find upper bound of the form 2^(2^n) >= x.

Possibly you mean 2 ** ( 2 ** n) >= x


From jason.scheirer at gmail.com  Mon Feb  2 16:41:33 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 2 Feb 2009 13:41:33 -0800 (PST)
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<gm41gr$c6i$01$1@news.t-online.com>
Message-ID: <8454f0fd-ce56-47aa-a450-8a01fb72d0b0@x6g2000pre.googlegroups.com>

On Feb 1, 3:37?am, Peter Otten <__pete... at web.de> wrote:
> Hussein B wrote:
> > Hey,
> > I have a log file that doesn't contain the word "Haskell" at all, I'm
> > just trying to do a little performance comparison:
> > ++++++++++++++
> > from datetime import time, timedelta, datetime
> > start = datetime.now()
> > print start
> > lines = [line for line in file('/media/sda4/Servers/Apache/
> > Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
> > print 'Number of lines contains "Haskell" = ' + ?str(len(lines))
> > end = datetime.now()
> > print end
> > ++++++++++++++
> > Well, the script is returning the whole file's lines number !!
> > What is wrong in my logic?
> > Thanks.
>
> """
> find(...)
> ? ? S.find(sub [,start [,end]]) -> int
>
> ? ? Return the lowest index in S where substring sub is found,
> ? ? such that sub is contained within s[start:end]. ?Optional
> ? ? arguments start and end are interpreted as in slice notation.
>
> ? ? Return -1 on failure.
> """
>
> a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
> context.
>
> Use
>
> [line for line in open(...) if line.find("Haskell") != -1]
>
> or, better
>
> [line for line in open(...) if "Haskell" in line]
>
> to get the expected result.
>
> Peter

Or better, group them together in a generator:

sum(line for line in open(...) if "Haskell" in line)

and avoid allocating a new list with every line that contains Haskell
in it.

http://www.python.org/dev/peps/pep-0289/


From lionel.keene at gmail.com  Mon Feb  2 16:43:26 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 13:43:26 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
Message-ID: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>

On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:

This is written very slowly, so you can read it better:

Please post without sarcasm.


This is the output from my Python shell:

>>> DatafilePath = "C:\\C8Example1.slc"
>>> ResourcefilePath = DatafilePath + ".rsc"
>>> DatafileFH = open(DatafilePath)
>>> ResourceFh = open(ResourcefilePath)
>>> DatafilePath
'C:\\C8Example1.slc'
>>> ResourcefilePath
'C:\\C8Example1.slc.rsc'

It seems to run without trouble. However, here is the offending code
in my class (followed by console output):

class C8DataType:

    def __init__(self, DataFilepath):

        try:
            DataFH = open(DataFilepath, "rb")

        except IOError, message:
            # Error opening file.
            print(message)
            return None

        ResourceFilepath = DataFilepath + ".src"

        print(DataFilepath)
        print(ResourceFilepath)

        # Try to open resource file, catch exception:
        try:
            ResourceFH = open(ResourceFilepath)

        except IOError, message:
            # Error opening file.
            print(message)
            print("Error opening " + ResourceFilepath)
            DataFH.close()
            return None

Console output when invoking as "someObject = C8DataType("C:\
\C8Example1.slc")" :

C:\C8Example1.slc
C:\C8Example1.slc.src
[Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
Error opening C:\C8Example1.slc.src


Thank you


> Lionel schrieb:
>
>
>
>
>
> > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> >>>>> Hi Folks, Python newbie here.
> >>>>> I'm trying to open (for reading) a text file with the following
> >>>>> filenaming convension:
> >>>>> "MyTextFile.slc.rsc"
> >>>>> My code is as follows:
> >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> >>>>> FileH = open(Filepath)
> >>>>> The above throws an IOError exception. On a hunch I changed the
> >>>>> filename (only the filename) and tried again:
> >>>>> Filepath = "C:\\MyTextFile.txt"
> >>>>> FileH = open(Filepath)
> >>>>> The above works well. I am able to open the file and read it's
> >>>>> contents. I assume to read a file in text file "mode" the parameter is
> >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> >>>>> know what version of "open(...)" to invoke. How do I pass the original
> >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> >>>>> file? Thanks in advance everyone!
> >>>> The extension shouldn't matter. I tried creating a file with the same
> >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> >>>> What's the complete traceback?
> >>>> Mike- Hide quoted text -
> >>>> - Show quoted text -
> >>> Hi Mike,
> >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> >>> gives an unformatted view of the file (text with no line wrapping,
> >>> just the end-of-line square box character followed by more text, end-
> >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> >>> end-of-line wrapping. I'm unsure of how these files are being
> >>> generated, I was just given them and told they wanted to be able to
> >>> read them.
> >>> How do I collect the traceback to post it?
> >> The traceback should look something like this fake one:
>
> >> Traceback (most recent call last):
> >> ? File "<pyshell#3>", line 1, in <module>
> >> ? ? raise IOError
> >> IOError
>
> >> Just copy and paste it in your next message. The other guys are
> >> probably right in that it is a line ending issue, but as they and I
> >> have said, Python shouldn't care (and doesn't on my machine).
>
> >> Mike- Hide quoted text -
>
> >> - Show quoted text -
>
> > Okay, I think I see what's going on. My class takes a single parameter
> > when it is instantiated...the file path of the data file the user
> > wants to open. This is of the form "someFile.slc". In the same
> > directory of "someFile.slc" is a resource file that (like a file
> > header) contains a host of parameters associated with the data file.
> > The resource file is of the form "someFile.slc.rsc". So, when the user
> > creates an instance of my class which, it invokes the __init__ method
> > where I add the ".rsc" extension to the original filename/path
> > parameter that was passed to the class "constructor". For example:
>
> > Note: try-catch blocks ommitted.
>
> > class MyUtilityClass:
> > ? ? def __init__(self, DataFilepath):
> > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > Invoking this from the Python shell explicitly is no problem i.e.
> > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > is lost when I append the ".rsc" extension to the DataFilePath
> > parameter as above. When the __init__ method is invoked, Python will
> > open the data file but generates the exception with the "open
> > (Resourcepath)" instruction. I think it is somehow related to the
> > backslashes but I'm not entirely sure of this. Any ideas?
>
> This is written very slowly, so you can read it better:
>
> Please post the traceback.
>
> Diez- Hide quoted text -
>
> - Show quoted text -



From drkjam at gmail.com  Mon Feb  2 16:48:14 2009
From: drkjam at gmail.com (David Moss)
Date: Mon, 2 Feb 2009 13:48:14 -0800 (PST)
Subject: the 'right way' to distribute and access data files in a packaged
	Python module
References: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>
	<6uopjfFgd5gdU1@mid.uni-berlin.de>
Message-ID: <c60822fd-d2ab-4ebb-8fae-2b563ff00fd4@u18g2000pro.googlegroups.com>


> There is a zip-safe flag that you can specify that tells setuptools that
> installing your egg only works if it is unarchived. However, there is also
> the pkg_resources-package that allows you to access streams from within a
> package, even if it is zipped. You should investigate these two options.
>
> Diez

Exactly what I was looking for.

Thanks Diez!


From sjmachin at lexicon.net  Mon Feb  2 16:50:28 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 13:50:28 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
Message-ID: <3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>

On Feb 3, 8:07?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:

>
> This is written very slowly, so you can read it better:
>
> Please post the traceback.

*AND* please post the text of the IOError message

*AND* please do yourself a favour and move your files out of the root
directory into a directory with a meaningful name


From Russ.Paielli at gmail.com  Mon Feb  2 16:51:11 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 13:51:11 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>

On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
>
> > > This is proven
> > > by your statement above, whereby you are driving a user away,
> > > simply because the language, in one small aspect, does not
> > > give him what he wants, and the tenor of this thread has been
> > > very much: "That's how it is - like it or lump it", and no amount
> > > of careful explanation of why people want the feature has cut
> > > any ice -
>
> > I'm missing the careful explanation. What I've heard is that the lack
> > of enforced encapsulation is "a danger". What I've heard is that
> > people want it because they've been told they should want it and
> > believe that. Why?
>
> Who has said the latter? Are you just trying to spread FUD?
>
> > There have been no "careful explanations" to answer that, in my mind.
> > And thus my response is: the practical possibility of needing access
> > vastly outweights the theoretical situation that might go bad if
> > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > *forced* encapsulation is pointless.
>
> I think you've gotten too subjective on this matter. You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.
>
> Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> PLAIN FUNCTIONS (!!!!) !!!!
>
> Heck, why do we even need OOP?? Long live procedural!!
>
> We don't even need no stinkin programming languages, we could just
> program using 1's and 0's!!!!!!!!!
>
> What's with this luddite attitude, Python community?
>
> > > It has all the time been countered with statements
> > > about how the proponents of private attributes "don't need it",
> > > (as if they are plain dumb),
>
> > They don't need it. No one has shown a *real* reason why. The only
> > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > That's not a real reason. If its your project that someone is doing
> > bad in, this is a situation which can be *clearly* specified in a
> > projects policy and coding standards and can be *trivially* tested for
> > with simple static analysis in nearly all cases. The problem is the
> > person and not the code then. There's *countless* other ways that
> > person can do bad if you're allowing them to commit blindly anything
> > into your project.
>
> Aha! I see this attitude quite often among C/C++ people, regarding
> buffer overflows and uninitialized pointer dereferences: someone will
> say "C and C++ are unsafe languages because they allow you to overrun
> buffers", then a C/C++ zealot will respond "Hire some good
> programmers".
>
> SAME ATTITUDE.

I couldn't agree more.

As I said before, as an aeronautical engineer I don't know if enforced
access restriction can be added to Python without compromising or
unduly complicating the language. Maybe it can't. If that's the case,
then people should make that argument. But just saying that enforced
access restriction is useless in general is nonsense. Are we supposed
to believe that the designers of C++, Java, Ada, and Scala are all
idiots?

Several participants here keep repeating that the leading-underscore
convention is perfectly adequate. Aside from the aesthetic problem of
littering code with leading underscores, let me try to explain the
problem with leading underscores.

Suppose a library developer (or a module developer on a large team)
uses leading underscores. Now suppose that, for whatever reason
(pressure from the users, perhaps), the library developer decides to
change a "private" attribute to public. Now all occurrences of the
identifier need to be changed. If an assignment to the previously
"private" attribute is missed, no warning will be issued (because
Python allows new attributes to be added anywhere, even completely
outside the class definition itself). And if the library is widely
used, the probability of such bugs occurring is very high.

If a "private" keyword (or equivalent) were available, then the change
would need to be made in only one location rather than at every
occurrence off the identifier. That is much less error prone. Sure,
you can argue (as I'm sure someone will) that the users of the library
should be more careful. Yes they should, but why not let the language
help with such low-level details. That's what high-level languages are
for.

Several people have argued that an advantage of the leading-underscore
convention is that it tells you at every occurrence of the identifier
that it is private. Of course, the leading-underscore convention could
still be used even in combination with enforced access restriction.
But the larger point is this: that is like saying that global
parameters should be repeated as literal numbers at every occurrence
so the user can see the value instantly. Sure, that saves you the
trouble of looking up the value when you need to know it, but it also
requres that any change must be carefully made at every location. No
competent programmer would argue in favor of that.


From __peter__ at web.de  Mon Feb  2 16:55:05 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 02 Feb 2009 22:55:05 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<gm41gr$c6i$01$1@news.t-online.com>
	<8454f0fd-ce56-47aa-a450-8a01fb72d0b0@x6g2000pre.googlegroups.com>
Message-ID: <gm7q3k$8hv$03$1@news.t-online.com>

Jason Scheirer wrote:

> On Feb 1, 3:37?am, Peter Otten <__pete... at web.de> wrote:
>> Hussein B wrote:
>> > Hey,
>> > I have a log file that doesn't contain the word "Haskell" at all, I'm
>> > just trying to do a little performance comparison:
>> > ++++++++++++++
>> > from datetime import time, timedelta, datetime
>> > start = datetime.now()
>> > print start
>> > lines = [line for line in file('/media/sda4/Servers/Apache/
>> > Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
>> > print 'Number of lines contains "Haskell" = ' + ?str(len(lines))
>> > end = datetime.now()
>> > print end
>> > ++++++++++++++
>> > Well, the script is returning the whole file's lines number !!
>> > What is wrong in my logic?
>> > Thanks.
>>
>> """
>> find(...)
>> S.find(sub [,start [,end]]) -> int
>>
>> Return the lowest index in S where substring sub is found,
>> such that sub is contained within s[start:end]. ?Optional
>> arguments start and end are interpreted as in slice notation.
>>
>> Return -1 on failure.
>> """
>>
>> a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
>> context.
>>
>> Use
>>
>> [line for line in open(...) if line.find("Haskell") != -1]
>>
>> or, better
>>
>> [line for line in open(...) if "Haskell" in line]
>>
>> to get the expected result.
>>
>> Peter
> 
> Or better, group them together in a generator:
> 
> sum(line for line in open(...) if "Haskell" in line)

You probably mean 

sum(1 for line in open(...) if "Haskell" in line)

if you want to count the lines containing "Haskell", or

sum(line.count("Haskell") for line in open(...) if "Haskell" in line)

if you want to count the occurences of "Haskell" (where the if clause is
logically superfluous, but may improve performance).
 
> and avoid allocating a new list with every line that contains Haskell
> in it.

But note that the OP stated that there were no such lines.

Peter




From python.list at tim.thechases.com  Mon Feb  2 16:58:32 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 02 Feb 2009 15:58:32 -0600
Subject: Where to put configuration/data files
In-Reply-To: <gm7iai$al3$1@panix3.panix.com>
References: <mailman.7995.1232937535.3487.python-list@python.org>
	<gm7iai$al3$1@panix3.panix.com>
Message-ID: <49876C88.6070508@tim.thechases.com>

>> Is there a nice cross-platform way to figure out the Right
>> (tm) place to store configuration files and other data?
> 
> For what purpose?  Global program config, user config, what?

I've found three main categories of settings like Aahz describes 
(of which I've used all in a single application):

global settings:
I usually keep these in the shared data-store (database or 
web-site/service).  This can include both global application 
settings such as the name of the institution running the app, or 
certain business-rules; and global user settings such as name, 
general preferences, colorschemes, etc.

machine-specific settings:
this relates to things like particular hardware configurations 
(path to the CD drive, resource-names/configurations for things 
like barcode/mag-stripe scanners, etc), or which server to 
connect to.  I usually store these in my application directory on 
Win32, or in /etc on *nix boxes.

User-specific per-machine settings:
This can include things like preferred window-layout (which may 
change depending on screen-size), stored 
passwords/authentication, cache-locations,
local document stores, etc.


There's one other odd-ball category I've seen but not used: 
portable storage on a USB drive.  It sorta crosses these 
boundaries being a bit of each (it's USB-drive specific, but can 
be moved from machine to machine).


Choose your best storage location by thinking what a user/admin 
would want for each setting.  Is it a global setting that all 
users need?  put it in a network store.  Is it something that 
pertains to a particular machine?  store it in either a 
machine-global repository or a user-specific repository accordingly.

-tkc






From kyosohma at gmail.com  Mon Feb  2 17:01:42 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 14:01:42 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>

On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> This is written very slowly, so you can read it better:
>
> Please post without sarcasm.
>
> This is the output from my Python shell:
>
> >>> DatafilePath = "C:\\C8Example1.slc"
> >>> ResourcefilePath = DatafilePath + ".rsc"
> >>> DatafileFH = open(DatafilePath)
> >>> ResourceFh = open(ResourcefilePath)
> >>> DatafilePath
>
> 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> 'C:\\C8Example1.slc.rsc'
>
> It seems to run without trouble. However, here is the offending code
> in my class (followed by console output):
>
> class C8DataType:
>
> ? ? def __init__(self, DataFilepath):
>
> ? ? ? ? try:
> ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> ? ? ? ? except IOError, message:
> ? ? ? ? ? ? # Error opening file.
> ? ? ? ? ? ? print(message)
> ? ? ? ? ? ? return None
>
> ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> ? ? ? ? print(DataFilepath)
> ? ? ? ? print(ResourceFilepath)
>
> ? ? ? ? # Try to open resource file, catch exception:
> ? ? ? ? try:
> ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> ? ? ? ? except IOError, message:
> ? ? ? ? ? ? # Error opening file.
> ? ? ? ? ? ? print(message)
> ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> ? ? ? ? ? ? DataFH.close()
> ? ? ? ? ? ? return None
>
> Console output when invoking as "someObject = C8DataType("C:\
> \C8Example1.slc")" :
>
> C:\C8Example1.slc
> C:\C8Example1.slc.src
> [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> Error opening C:\C8Example1.slc.src
>
> Thank you
>
> > Lionel schrieb:
>
> > > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > >>>>> Hi Folks, Python newbie here.
> > >>>>> I'm trying to open (for reading) a text file with the following
> > >>>>> filenaming convension:
> > >>>>> "MyTextFile.slc.rsc"
> > >>>>> My code is as follows:
> > >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> > >>>>> FileH = open(Filepath)
> > >>>>> The above throws an IOError exception. On a hunch I changed the
> > >>>>> filename (only the filename) and tried again:
> > >>>>> Filepath = "C:\\MyTextFile.txt"
> > >>>>> FileH = open(Filepath)
> > >>>>> The above works well. I am able to open the file and read it's
> > >>>>> contents. I assume to read a file in text file "mode" the parameter is
> > >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > >>>>> know what version of "open(...)" to invoke. How do I pass the original
> > >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > >>>>> file? Thanks in advance everyone!
> > >>>> The extension shouldn't matter. I tried creating a file with the same
> > >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> > >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> > >>>> What's the complete traceback?
> > >>>> Mike- Hide quoted text -
> > >>>> - Show quoted text -
> > >>> Hi Mike,
> > >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > >>> gives an unformatted view of the file (text with no line wrapping,
> > >>> just the end-of-line square box character followed by more text, end-
> > >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> > >>> end-of-line wrapping. I'm unsure of how these files are being
> > >>> generated, I was just given them and told they wanted to be able to
> > >>> read them.
> > >>> How do I collect the traceback to post it?
> > >> The traceback should look something like this fake one:
>
> > >> Traceback (most recent call last):
> > >> ? File "<pyshell#3>", line 1, in <module>
> > >> ? ? raise IOError
> > >> IOError
>
> > >> Just copy and paste it in your next message. The other guys are
> > >> probably right in that it is a line ending issue, but as they and I
> > >> have said, Python shouldn't care (and doesn't on my machine).
>
> > >> Mike- Hide quoted text -
>
> > >> - Show quoted text -
>
> > > Okay, I think I see what's going on. My class takes a single parameter
> > > when it is instantiated...the file path of the data file the user
> > > wants to open. This is of the form "someFile.slc". In the same
> > > directory of "someFile.slc" is a resource file that (like a file
> > > header) contains a host of parameters associated with the data file.
> > > The resource file is of the form "someFile.slc.rsc". So, when the user
> > > creates an instance of my class which, it invokes the __init__ method
> > > where I add the ".rsc" extension to the original filename/path
> > > parameter that was passed to the class "constructor". For example:
>
> > > Note: try-catch blocks ommitted.
>
> > > class MyUtilityClass:
> > > ? ? def __init__(self, DataFilepath):
> > > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > > Invoking this from the Python shell explicitly is no problem i.e.
> > > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > > is lost when I append the ".rsc" extension to the DataFilePath
> > > parameter as above. When the __init__ method is invoked, Python will
> > > open the data file but generates the exception with the "open
> > > (Resourcepath)" instruction. I think it is somehow related to the
> > > backslashes but I'm not entirely sure of this. Any ideas?
>
> > This is written very slowly, so you can read it better:
>
> > Please post the traceback.
>
> > Diez- Hide quoted text -
>
> > - Show quoted text -

Well, if I understand your code correctly, you pass in a filename that
exists, then you append an extension to it and expect that to change
the file's name. This doesn't work, as you only changed the string,
not the filename in the file system itself. You can probably use
os.rename() to do it. Then it should be able to open it.

Mike


From sjmachin at lexicon.net  Mon Feb  2 17:07:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 14:07:50 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <0fbf8005-b609-44fb-9911-0ae9972df9c0@v5g2000pre.googlegroups.com>

On Feb 3, 8:43?am, Lionel <lionel.ke... at gmail.com> wrote:

> ? ? ? ? ResourceFilepath = DataFilepath + ".src"

Don't you mean ".rsc"?


From steve at holdenweb.com  Mon Feb  2 17:25:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 17:25:41 -0500
Subject: Import without executing module
In-Reply-To: <79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>	<mailman.8572.1233559153.3487.python-list@python.org>	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>	<7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
	<79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>
Message-ID: <gm7rt7$sji$1@ger.gmane.org>

Taskinoor Hasan wrote:
[...]
> It make sense :-).  So my reasoning......let A is imported in B, i.e.
> name A is put in B's namespace. When we call something like A.a then the
> interpreter first resolve A in B's namespace, then to get a, it need to
> look up A's namespace. And there is no way to populate A's namespace
> without executing A, and as all statements, including 'def', 'class'
> etc., are treated in the same way, whole script need to be executed.
> 
> So whether a script can be imported as module or not is mainly dependent
> on how the script is written and largely on the intention of the coder.
> 
That's right!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Mon Feb  2 17:33:50 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 14:33:50 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
Message-ID: <b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>

On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > This is written very slowly, so you can read it better:
>
> > Please post without sarcasm.
>
> > This is the output from my Python shell:
>
> > >>> DatafilePath = "C:\\C8Example1.slc"
> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > >>> DatafileFH = open(DatafilePath)
> > >>> ResourceFh = open(ResourcefilePath)
> > >>> DatafilePath
>
> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > 'C:\\C8Example1.slc.rsc'
>
> > It seems to run without trouble. However, here is the offending code
> > in my class (followed by console output):
>
> > class C8DataType:
>
> > ? ? def __init__(self, DataFilepath):
>
> > ? ? ? ? try:
> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > ? ? ? ? except IOError, message:
> > ? ? ? ? ? ? # Error opening file.
> > ? ? ? ? ? ? print(message)
> > ? ? ? ? ? ? return None
>
> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > ? ? ? ? print(DataFilepath)
> > ? ? ? ? print(ResourceFilepath)
>
> > ? ? ? ? # Try to open resource file, catch exception:
> > ? ? ? ? try:
> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > ? ? ? ? except IOError, message:
> > ? ? ? ? ? ? # Error opening file.
> > ? ? ? ? ? ? print(message)
> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > ? ? ? ? ? ? DataFH.close()
> > ? ? ? ? ? ? return None
>
> > Console output when invoking as "someObject = C8DataType("C:\
> > \C8Example1.slc")" :
>
> > C:\C8Example1.slc
> > C:\C8Example1.slc.src
> > [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> > Error opening C:\C8Example1.slc.src
>
> > Thank you
>
> > > Lionel schrieb:
>
> > > > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > > >>>>> Hi Folks, Python newbie here.
> > > >>>>> I'm trying to open (for reading) a text file with the following
> > > >>>>> filenaming convension:
> > > >>>>> "MyTextFile.slc.rsc"
> > > >>>>> My code is as follows:
> > > >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> > > >>>>> FileH = open(Filepath)
> > > >>>>> The above throws an IOError exception. On a hunch I changed the
> > > >>>>> filename (only the filename) and tried again:
> > > >>>>> Filepath = "C:\\MyTextFile.txt"
> > > >>>>> FileH = open(Filepath)
> > > >>>>> The above works well. I am able to open the file and read it's
> > > >>>>> contents. I assume to read a file in text file "mode" the parameter is
> > > >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > >>>>> know what version of "open(...)" to invoke. How do I pass the original
> > > >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > >>>>> file? Thanks in advance everyone!
> > > >>>> The extension shouldn't matter. I tried creating a file with the same
> > > >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> > > >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> > > >>>> What's the complete traceback?
> > > >>>> Mike- Hide quoted text -
> > > >>>> - Show quoted text -
> > > >>> Hi Mike,
> > > >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > > >>> gives an unformatted view of the file (text with no line wrapping,
> > > >>> just the end-of-line square box character followed by more text, end-
> > > >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> > > >>> end-of-line wrapping. I'm unsure of how these files are being
> > > >>> generated, I was just given them and told they wanted to be able to
> > > >>> read them.
> > > >>> How do I collect the traceback to post it?
> > > >> The traceback should look something like this fake one:
>
> > > >> Traceback (most recent call last):
> > > >> ? File "<pyshell#3>", line 1, in <module>
> > > >> ? ? raise IOError
> > > >> IOError
>
> > > >> Just copy and paste it in your next message. The other guys are
> > > >> probably right in that it is a line ending issue, but as they and I
> > > >> have said, Python shouldn't care (and doesn't on my machine).
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Okay, I think I see what's going on. My class takes a single parameter
> > > > when it is instantiated...the file path of the data file the user
> > > > wants to open. This is of the form "someFile.slc". In the same
> > > > directory of "someFile.slc" is a resource file that (like a file
> > > > header) contains a host of parameters associated with the data file.
> > > > The resource file is of the form "someFile.slc.rsc". So, when the user
> > > > creates an instance of my class which, it invokes the __init__ method
> > > > where I add the ".rsc" extension to the original filename/path
> > > > parameter that was passed to the class "constructor". For example:
>
> > > > Note: try-catch blocks ommitted.
>
> > > > class MyUtilityClass:
> > > > ? ? def __init__(self, DataFilepath):
> > > > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > > > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > > > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > > > Invoking this from the Python shell explicitly is no problem i.e.
> > > > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > > > is lost when I append the ".rsc" extension to the DataFilePath
> > > > parameter as above. When the __init__ method is invoked, Python will
> > > > open the data file but generates the exception with the "open
> > > > (Resourcepath)" instruction. I think it is somehow related to the
> > > > backslashes but I'm not entirely sure of this. Any ideas?
>
> > > This is written very slowly, so you can read it better:
>
> > > Please post the traceback.
>
> > > Diez- Hide quoted text -
>
> > > - Show quoted text -
>
> Well, if I understand your code correctly, you pass in a filename that
> exists, then you append an extension to it and expect that to change
> the file's name. This doesn't work, as you only changed the string,
> not the filename in the file system itself. You can probably use
> os.rename() to do it. Then it should be able to open it.
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Hello Mike,

I'm sorry, I'm not making myself clear. I have two files in my root
directory: "C8Example1.slc" and "C8Example1.slc.rsc". (They are just
in the root directory for testing for the time being). The ".slc" file
contains the data and the ".slc.rsc" file contains the info necessary
to extract it (datatype, width, height, etc). I know a priori that the
header file will always be in the same directory and have the same
name as the data file with the exception that it will have ".rsc"
appended to its name. Therefore, when the user passes the data file
name and path as a string to the class, I check the parameter by
seeing if I can read to that filepath. If so, I simply add ".rsc" to
the end of the parameter string and try to read to that new filepath/
name in order to acquire the header information. This works when
typing it directly into the shell script (see above), but not when
coded in my class.

The IOError is printed above, but being a newbie I'm unsure of how to
see the traceback. I've only been using these tools for a couple of
days.


From steve at holdenweb.com  Mon Feb  2 17:34:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 17:34:51 -0500
Subject: Membership of multiple items to a list
In-Reply-To: <fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm7sed$sji$2@ger.gmane.org>

Stephen Hansen wrote:
> On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney
> <bignose+hates-spam at benfinney.id.au> wrote:
>> rdmurray at bitdance.com writes:
>>
>>> I don't even see Stephen Hansen's posts. My newsreader just shows
>>> the header and says "[HTML part not displayed]".
>>
>> Likewise.
> 
> Yeah, I know HTML is bad on newsgroups. I didn't realize that when I
> installed FireGPG to sign messages while in Gmail that it started
> handling my html/plain text content differently.
> 
> Oops.
> 
> That said: Is S/MIME / OpenPGP readable on these various clients?
> There's no HTML, the text body is just encoded in base64.
> 
> I haven't actually subscribed to a usenet newsgroup in eons upon eons.
> If its not readable as S/MIME then I'll switch to inline PGP... that's
> just a slightly terrible solution for other places I have to talk and
> I'll have to take extra care to remember to manually check the settings
> based upon where I'm talking.
> 
Or configure multiple personalities with the same email address but
different settings, so all you have to do is switch personalities
appropriately.

> I'm re-sending this same message as the OpenPGP S/MIME attachment format
> -- just so test if its actually readable by news clients in general. I
> have absolutely no idea. Not touched a news client in years and years,
> as I said.
> 
> Sorry for the inconvenience.

I run Thunderbird with the OpenPGP add-on, and I hadn't noticed anything
at all strange about your posts :).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From kurt.forrester.fec at googlemail.com  Mon Feb  2 17:35:48 2009
From: kurt.forrester.fec at googlemail.com (Kurt Forrester)
Date: Mon, 02 Feb 2009 22:35:48 +0000
Subject: MySQLdb and MySQL stored functions
Message-ID: <1233614148.14298.4.camel@macbook>

Hello All,


I am running 
 - Ubuntu 8.10
 - Python 2.5.2
 - MySQLdb (1, 2, 2, 'final', 0)
 - MySQL Server/Client 5.0.67

I am trying to write an authentication script for a python application
that connects to a MySQL database. The database has a table named `user`
which has the fields `id`, `alias` and `password` as well as a stored
function `authenticate` as detailed below:

	CREATE DEFINER=`root`@`localhost` FUNCTION `authenticate`(a TEXT, p
TEXT) RETURNS int(11)
		BEGIN
			DECLARE STATUS INT DEFAULT -1;
				SELECT id INTO STATUS FROM user WHERE alias = a AND password = p;
		RETURN STATUS;
		END

table: 	`user`
	`id` = 1
	`alias` = 'captain'
	`password' = 'a'

I have been executing the following query from various connections:
	`SELECT authenticate('captain', 'a')` (this is what is in the table and
should return 1)
and
	`SELECT authenticate('captain', 'aa')` (this is a incorrect version of
the password and should return -1)

I have tried running this query from the MySQL Query Browser and it
returns results as expected.
I have also tried query from python using the _mysql module and this
also returns results as expected.
However, when I try to use the MySQLdb module it returns an incorrect
value (it returns 1).

I wish to use the DB API 2.0 compliant module for flexibility. Therefore
I am trying to work out why the MySQLdb does not return the value as
expected (that is as it is returned by the Query Browser).

Any help would be greatly appreciated.

Kurt
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From lionel.keene at gmail.com  Mon Feb  2 17:37:10 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 14:37:10 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<0fbf8005-b609-44fb-9911-0ae9972df9c0@v5g2000pre.googlegroups.com>
Message-ID: <1f06f9ce-e3e4-4f62-8eca-5db11e73237d@v39g2000pro.googlegroups.com>

On Feb 2, 2:07?pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 3, 8:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> Don't you mean ".rsc"?

Good Grief!!! That's It!! I've been staring at it all day and I didn't
see it.

I'm sorry I've wasted everyone's time. This is bloody embarassing.
Amateur night.

Thank you for the help everyone.

-L


From minesh at gmail.com  Mon Feb  2 17:39:39 2009
From: minesh at gmail.com (Minesh Patel)
Date: Mon, 2 Feb 2009 14:39:39 -0800
Subject: Python patch module
Message-ID: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>

Hi,
I was wondering if there is any patch management module for Python.
Basically I am looking to only apply a hunk from a patch if the file
exists.

-- 
Thanks,
Minesh


From darcy at druid.net  Mon Feb  2 17:40:26 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 2 Feb 2009 17:40:26 -0500
Subject: Membership of multiple items to a list
In-Reply-To: <gm7sed$sji$2@ger.gmane.org>
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
	<gm7sed$sji$2@ger.gmane.org>
Message-ID: <20090202174026.16629f0f.darcy@druid.net>

On Mon, 02 Feb 2009 17:34:51 -0500
Steve Holden <steve at holdenweb.com> wrote:
> Or configure multiple personalities with the same email address but
> different settings, so all you have to do is switch personalities
> appropriately.

They have pills for that now.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From digitig at gmail.com  Mon Feb  2 17:46:43 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 2 Feb 2009 22:46:43 +0000
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <aee48b3c0902021446nf6716d8sbe600325b8bd3e3a@mail.gmail.com>

2009/2/2 Russ P. <Russ.Paielli at gmail.com>:

> Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?

No, we're supposed to believe that the designers of C++, Java, Ada,
and Scala are all designers of languages that are not Python. If all
languages had the same philosophy what would be the point of different
languages? Is it worth mentioning (again) that Python is not Java?

-- 
Tim Rowe


From casevh at gmail.com  Mon Feb  2 17:47:47 2009
From: casevh at gmail.com (casevh)
Date: Mon, 2 Feb 2009 14:47:47 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <6508f883-9d87-4583-b086-12429a714a96@g1g2000pra.googlegroups.com>

On Jan 30, 11:03?pm, Jon Clements <jon... at googlemail.com> wrote:
> Hi Group,
>
> This has a certain amount of irony (as this is what I'm pretty much
> after):-
> Fromhttp://docs.python.org/dev/3.0/whatsnew/3.1.html:
> "The int() type gained a bit_length method that returns the number of
> bits necessary to represent its argument in binary:"
>
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.
>
> Cheers,
>
> Jon.

If performance does become an issue, the newly released gmpy 1.04
includes bit_length().

casevh


From kyrie at uh.cu  Mon Feb  2 17:48:58 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 2 Feb 2009 17:48:58 -0500
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <200902021748.59161.kyrie@uh.cu>

On Monday 02 February 2009 04:51:11 pm Russ P. wrote:
> As I said before, as an aeronautical engineer I don't know if enforced
> access restriction can be added to Python without compromising or
> unduly complicating the language. Maybe it can't. If that's the case,
> then people should make that argument. But just saying that enforced
> access restriction is useless in general is nonsense. Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?

I'm amazed at how quickly this thread degenerated into another 'enforced data 
hiding' thread. I think the previous one ran long enough for me to actually 
say that 'access restriction is nonsense', when my point had been '_enforced_ 
access restrictions in python is worthless in all the examples provided so 
far' (except perhaps the extensions modules, but those are not python).

You are an aeronautical engineer. You, and I understand that, don't want, 
shouldn't want, and will not want to run anything you cannot trust. You want 
the most assurances you can get. You are well within your right to want 
that - to disallow in your systems, and in the systems that you build, 
anything that you even suspect that may threaten the integrity of the system, 
and let's face it, breaking the encapsulation, intentional or not, is pretty 
suspicious.

So, in current python, _you_ have the _choice_ of preventing it. As the checks 
are static, of course, you can break them in runtime, just like you would in 
C, C++ and Java.

But somehow, it is not enough for you that you have the choice, because that 
also gives _me_ the choice of _not_ doing it in my own systems. And you still 
haven't said why it bothers you that I have the choice.

Now, if you were arguing for [truly optional - as in, the user decides] 
dynamic checks, you may see a very different position. That RExec and Bastion 
even existed should tell you that there is interest on implementing some kind 
of trusted execution (as in 'I trust this code to do whatever it wants, but 
not this other code'). That both projects failed should tell you that either 
it is impossible to achieve in python (which would be bad), or that there is 
just not enough interest on keeping them (which would not amaze me). But, if 
you are arguing for dynamic checks, those are not present in C++ either, and 
thus, it isn't really what you mean with enforced data hiding.

> If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.

Good coding standards would prevent that. And by good coding standards, I 
mean "treat pylint and similar tools as a requirement before executing any 
code", and it will catch that sort of bugs. Again, _you_ have the choice. Use 
it if you wish.

Now, I'm with you in that accidental variable creation is a nasty side effect 
of python dynamism (and that you may be forfeiting it if you go the pylint 
route). But that particular complaint has nothing to do with enforced vs 
not-enforced data hiding, and everything to do with static typing. And mind 
you, must of us who use python, do so _because_ of the dynamism and not in 
spite of it.

Funny thing is, you have the choice, _now, today_, of having your precious 
static checks, both of them, for your projects. But you keep complaining 
because I also have the choice, and I may chose not to have them.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From fredbasset1000 at gmail.com  Mon Feb  2 18:03:18 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Mon, 2 Feb 2009 15:03:18 -0800 (PST)
Subject: Where & how to deallocate resources in Python C extension
Message-ID: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>

Hi,

I've written a C extension, see code below, to provide a Python
interface to a hardware watchdog timer.  As part of the initialization
it makes some calls to mmap, I am wondering should I be making
balanced calls to munmap in some kind of de-init function?  Do Python
extensions have d'tors?

Thanks for any help,
Fred

----------------------------------------------------------------------------------------------
#include <Python.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>
#include <errno.h>

static const uint8_t WD_PAT_VALUE = 0x05; // hard coded value to
indicate a pat to the watchdog

static uint8_t* wdt_control = NULL;
static uint8_t* wdt_feed = NULL;

/*!
    \brief Initialize the watchdog timer and start it.

    \param[in] int timeout_period, value to pass to timeout register
0x00 - 0x07, see table above.
    \return void
*/
static PyObject* init(PyObject *self, PyObject *args) {
    int period;
    int fd;

    if (!PyArg_Parse(args, "(i)", &period)) {
        PyErr_SetString(PyExc_TypeError, "single integer argument
expected");
        return NULL;
    }
    if (period <= 0x00 || period >= 0x07) {
        PyErr_SetString(PyExc_ValueError, "watchdog reg. value out of
range (0x00 to 0x07 only)");
        return NULL;
    }

    fd = open("/dev/mem", O_RDWR | O_SYNC);
    if (fd == -1) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }
    wdt_control = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0x23800000);
    if (wdt_control == MAP_FAILED) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }

    wdt_feed = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0x23C00000);
    if (wdt_feed == MAP_FAILED) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }

    *wdt_feed = WD_PAT_VALUE;   // must first pat the w.d. before
setting period
    *wdt_control = period;

    Py_INCREF(Py_None);
    return Py_None;
}

/*!
    \brief Pat the watchdog timer once.
    Always call init() before calling this function.

    \return void
*/
static PyObject* pat(PyObject *self, PyObject *args)
{
    if (!PyArg_Parse(args, "( )")) { // verify no args passed
        return NULL;
    }

    if (wdt_feed != NULL) {
        *wdt_feed = WD_PAT_VALUE;
    }

    Py_INCREF(Py_None);
    return Py_None;
}

// method registration table
static struct PyMethodDef wdt_methods[] = {
    {"init", init, METH_VARARGS},
    {"pat", pat, METH_VARARGS},
    {NULL, NULL}
};

// module initializer, called on first import
void initwdtmodule() {
    (void) Py_InitModule("wdtmodule", wdt_methods);
}


From robert.kern at gmail.com  Mon Feb  2 18:05:40 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 02 Feb 2009 17:05:40 -0600
Subject: Python patch module
In-Reply-To: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>
References: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>
Message-ID: <gm7u84$5hc$1@ger.gmane.org>

On 2009-02-02 16:39, Minesh Patel wrote:
> Hi,
> I was wondering if there is any patch management module for Python.
> Basically I am looking to only apply a hunk from a patch if the file
> exists.

Google's diff-match-patch library might be up your alley.

http://code.google.com/p/google-diff-match-patch/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Russ.Paielli at gmail.com  Mon Feb  2 18:20:52 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 15:20:52 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com> 
	<mailman.8649.1233614806.3487.python-list@python.org>
Message-ID: <da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>

On Feb 2, 2:46 pm, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/2 Russ P. <Russ.Paie... at gmail.com>:
>
> > Are we supposed
> > to believe that the designers of C++, Java, Ada, and Scala are all
> > idiots?
>
> No, we're supposed to believe that the designers of C++, Java, Ada,
> and Scala are all designers of languages that are not Python. If all
> languages had the same philosophy what would be the point of different
> languages? Is it worth mentioning (again) that Python is not Java?
>
> --
> Tim Rowe

I am not sure why people keep "mentioning" that "Python is not Java."
As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
either. All of those languages have enforced access restriction. Why
only mention Java?

For the record, I have never used Java, nor do I have any desire to
ever use it. That is why I am intrigued by the apparent obsession with
it here. I suspect that many programmers are forced to use against
their wishes. If that's the case, you have my sympathies, but let's
not pretend that Java is the only popular OO language with enforced
access restrictions.


From google at mrabarnett.plus.com  Mon Feb  2 18:25:13 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 23:25:13 +0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <498780D9.40603@mrabarnett.plus.com>

Lionel wrote:
> On Feb 2, 1:07 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> 
> This is written very slowly, so you can read it better:
> 
> Please post without sarcasm.
> 
> 
> This is the output from my Python shell:
> 
>>>> DatafilePath = "C:\\C8Example1.slc"
>>>> ResourcefilePath = DatafilePath + ".rsc"
>>>> DatafileFH = open(DatafilePath)
>>>> ResourceFh = open(ResourcefilePath)
>>>> DatafilePath
> 'C:\\C8Example1.slc'
>>>> ResourcefilePath
> 'C:\\C8Example1.slc.rsc'
> 
Here the extension is '.rsc' ...

> It seems to run without trouble. However, here is the offending code
> in my class (followed by console output):
> 
> class C8DataType:
> 
>     def __init__(self, DataFilepath):
> 
>         try:
>             DataFH = open(DataFilepath, "rb")
> 
>         except IOError, message:
>             # Error opening file.
>             print(message)
>             return None
> 
>         ResourceFilepath = DataFilepath + ".src"
> 
... but here the extension is '.src'.

Is that the problem.

>         print(DataFilepath)
>         print(ResourceFilepath)
> 
>         # Try to open resource file, catch exception:
>         try:
>             ResourceFH = open(ResourceFilepath)
> 
>         except IOError, message:
>             # Error opening file.
>             print(message)
>             print("Error opening " + ResourceFilepath)
>             DataFH.close()
>             return None
> 
> Console output when invoking as "someObject = C8DataType("C:\
> \C8Example1.slc")" :
> 
> C:\C8Example1.slc
> C:\C8Example1.slc.src
> [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> Error opening C:\C8Example1.slc.src
> 
[snip]
It can't find "C:\C8Example1.slc.src", but I think you intended 
"C:\C8Example1.slc.rsc".


From tutufan at gmail.com  Mon Feb  2 18:27:33 2009
From: tutufan at gmail.com (Mike)
Date: Mon, 2 Feb 2009 15:27:33 -0800 (PST)
Subject: handy way to spot-profile a python program (watch+pstat+tac)
Message-ID: <87a8941c-233c-4790-9578-9d2660eafa9c@i18g2000prf.googlegroups.com>

Someone (forget who) mentioned recently that you could get some "poor
man's" profiling info by attaching to a running python with gdb, and
periodically grabbing a stack trace.

I figured out that there's a handy way to do this with this command:

    watch -n 1 'pstack 30154 | tac'

which will show a full-screen stack dump once per second on the python
with pid 30154.  (It works with non-Python, too--the 'p' is apparently
for "process", not "python".)

If the interesting part runs off the bottom of your screen, you can
always leave off the tac, though that makes it a bit jumpier.

(pstack uses the ptrace interface, which may annoy the parents of this
process if they're paying attention (which is not usually the case).)

Have fun,
Mike


From demirbaris at gmail.com  Mon Feb  2 18:40:22 2009
From: demirbaris at gmail.com (Baris Demir)
Date: Tue, 03 Feb 2009 00:40:22 +0100
Subject: function scope
Message-ID: <49878466.9010503@gmail.com>

Hi everybody,

I am quite new to python and using it for my thesis.  Luckily I found 
out some kind of behavior surprising to me and so unwanted in my code. I 
could not find any explanation, so solution for the code.
It is simply like this:

/*li = another_module.global_variable
f=simpleCut(li)

def simpleCut(d=dict()):
       temp=d
       for i in temp.keys():
           if    (temp[i] == .......) :
              temp[i]=new_value
return temp
*/
here /*simpleCut(d=dict())*/ is a function that changes the value of the 
key in the d if it satisfies conditions and returns the new dictionary.
what i do not understand is, when i checked the original dictionary 
/*li,*/ i also found out that, the value of that key(operated in the if 
statement) had also been changed. so, simply, the simpleCut function 
also changes the variables of its own argument, even there is a 'temp' 
variable. That is a scandal for my code:)

please tell me, if this is not possible and i am missing another thing 
in my code, or if this kind of behavior is possible, what is the 
philosophy of it, and how can i change it???

cheers

B.D.
   
   
   


From benjamin.kaplan at case.edu  Mon Feb  2 18:58:05 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 2 Feb 2009 18:58:05 -0500
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <ec96e1390902021558j69ab7ad7tf118756e093785c@mail.gmail.com>

On Mon, Feb 2, 2009 at 4:51 PM, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> > On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> >
> > > > This is proven
> > > > by your statement above, whereby you are driving a user away,
> > > > simply because the language, in one small aspect, does not
> > > > give him what he wants, and the tenor of this thread has been
> > > > very much: "That's how it is - like it or lump it", and no amount
> > > > of careful explanation of why people want the feature has cut
> > > > any ice -
> >
> > > I'm missing the careful explanation. What I've heard is that the lack
> > > of enforced encapsulation is "a danger". What I've heard is that
> > > people want it because they've been told they should want it and
> > > believe that. Why?
> >
> > Who has said the latter? Are you just trying to spread FUD?
> >
> > > There have been no "careful explanations" to answer that, in my mind.
> > > And thus my response is: the practical possibility of needing access
> > > vastly outweights the theoretical situation that might go bad if
> > > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > > *forced* encapsulation is pointless.
> >
> > I think you've gotten too subjective on this matter. You might as well
> > say that we don't need no stinkin' OOP, we could all just be
> > programming with goto's.
> >
> > Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> > PLAIN FUNCTIONS (!!!!) !!!!
> >
> > Heck, why do we even need OOP?? Long live procedural!!
> >
> > We don't even need no stinkin programming languages, we could just
> > program using 1's and 0's!!!!!!!!!
> >
> > What's with this luddite attitude, Python community?
> >
> > > > It has all the time been countered with statements
> > > > about how the proponents of private attributes "don't need it",
> > > > (as if they are plain dumb),
> >
> > > They don't need it. No one has shown a *real* reason why. The only
> > > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > > That's not a real reason. If its your project that someone is doing
> > > bad in, this is a situation which can be *clearly* specified in a
> > > projects policy and coding standards and can be *trivially* tested for
> > > with simple static analysis in nearly all cases. The problem is the
> > > person and not the code then. There's *countless* other ways that
> > > person can do bad if you're allowing them to commit blindly anything
> > > into your project.
> >
> > Aha! I see this attitude quite often among C/C++ people, regarding
> > buffer overflows and uninitialized pointer dereferences: someone will
> > say "C and C++ are unsafe languages because they allow you to overrun
> > buffers", then a C/C++ zealot will respond "Hire some good
> > programmers".
> >
> > SAME ATTITUDE.
>
> I couldn't agree more.
>
> As I said before, as an aeronautical engineer I don't know if enforced
> access restriction can be added to Python without compromising or
> unduly complicating the language. Maybe it can't. If that's the case,
> then people should make that argument. But just saying that enforced
> access restriction is useless in general is nonsense. Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?
>
> Several participants here keep repeating that the leading-underscore
> convention is perfectly adequate. Aside from the aesthetic problem of
> littering code with leading underscores, let me try to explain the
> problem with leading underscores.
>
> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.


1. This would be a great spot to use a property. Problem solved.
2. Unit tests. Lots of unit tests.
3. Pylint will check for uninitialized fields. It won't stop you from
running the code obviously, but it will notify you if you forgot to change
something.
4. Find/Replace. Takes the effort out of looking for the places to change
the name.


[long argument for private keyword]

> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rhodri at wildebst.demon.co.uk  Mon Feb  2 18:59:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 02 Feb 2009 23:59:47 -0000
Subject: Question about wx folder browser widget
In-Reply-To: <gm5ng0$68l$1@ger.gmane.org>
References: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
	<gm5ng0$68l$1@ger.gmane.org>
Message-ID: <op.uoq0xxcka8ncjz@gnudebst>

On Mon, 02 Feb 2009 02:58:07 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Sam Price wrote:
>> Is there any good wx widgets that provide the same feel as folder/file
>> browser.
>> I want to be notified when a user tries to drag and drop a file/folder
>> on the widget, and then copy that file/folder to a new folder an do
>> operations on it.
>>
>> Wanted to check first to see if something exists, and not reinvent the
>> wheel.
>>
> There's TreeCtrl, and CustomTreeCtrl. I don't know whether they can be
> used with drag and drop,

Yes they can, at least after a fashion.  See
http://wiki.wxpython.org/TreeControls

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Mon Feb  2 19:13:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 00:13:27 +0000
Subject: function scope
In-Reply-To: <49878466.9010503@gmail.com>
References: <49878466.9010503@gmail.com>
Message-ID: <49878C27.6010204@mrabarnett.plus.com>

Baris Demir wrote:
 > Hi everybody,
 >
 > I am quite new to python and using it for my thesis.  Luckily I found
 > out some kind of behavior surprising to me and so unwanted in my code. I
 > could not find any explanation, so solution for the code.
 > It is simply like this:
 >
 > /*li = another_module.global_variable
 > f=simpleCut(li)
 >
 > def simpleCut(d=dict()):
 >       temp=d
 >       for i in temp.keys():
 >           if    (temp[i] == .......) :
 >              temp[i]=new_value
 > return temp
 > */
 > here /*simpleCut(d=dict())*/ is a function that changes the value of the
 > key in the d if it satisfies conditions and returns the new dictionary.
 > what i do not understand is, when i checked the original dictionary
 > /*li,*/ i also found out that, the value of that key(operated in the if
 > statement) had also been changed. so, simply, the simpleCut function
 > also changes the variables of its own argument, even there is a 'temp'
 > variable. That is a scandal for my code:)
 >
 > please tell me, if this is not possible and i am missing another thing
 > in my code, or if this kind of behavior is possible, what is the
 > philosophy of it, and how can i change it???
 >
It's called "Reference Semantics".

"d" refers to a dict. When you say "temp=d" it makes "temp" also refer
to that dict; it doesn't copy the dict. If you want a copy when you have
to do so explicitly with "temp=d.copy()".

When you pass "li" into simpleCut() you're not making a copy either!


From apt.shansen at gmail.com  Mon Feb  2 19:15:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 16:15:45 -0800
Subject: function scope
In-Reply-To: <49878466.9010503@gmail.com>
References: <49878466.9010503@gmail.com>
Message-ID: <7a9c25c20902021615q77ca48dbtc165f65ac5f69664@mail.gmail.com>

On Mon, Feb 2, 2009 at 3:40 PM, Baris Demir <demirbaris at gmail.com> wrote:

> Hi everybody,
>
> I am quite new to python and using it for my thesis.  Luckily I found out
> some kind of behavior surprising to me and so unwanted in my code. I could
> not find any explanation, so solution for the code.
> It is simply like this:
>
> /*li = another_module.global_variable
> f=simpleCut(li)
>
> def simpleCut(d=dict()):
>      temp=d
>      for i in temp.keys():
>          if    (temp[i] == .......) :
>             temp[i]=new_value
> return temp
> */
> here /*simpleCut(d=dict())*/ is a function that changes the value of the
> key in the d if it satisfies conditions and returns the new dictionary.
> what i do not understand is, when i checked the original dictionary /*li,*/
> i also found out that, the value of that key(operated in the if statement)
> had also been changed. so, simply, the simpleCut function also changes the
> variables of its own argument, even there is a 'temp' variable. That is a
> scandal for my code:)


In Python, assignment statements simply bind an existing object to a name:
and when you call a function and pass that name in you're not passing the
name but the object itself-- which will now be bound to a new name.

So, if you have:

  li = {"hello": 5}

A dictionary is created, and is bound to the name "li".

If you then call:

   f=simpleCut(li)

The dictionary, previously created, will be bound to a new name within
simpleCut, that of "d".

Within simpleCut, you do:
    temp = d

That's simply binding the same dictionary to a new name. Its also the same
dictionary which is known as "li" somewhere else.

You then later do:
    return temp

That's returning the same dictionary-- as its returning from the function
the object currently bound to the name 'temp'.

That dictionary will end up being assigned to "f" from earlier.

In all of this you have one single dictionary, known by many names. You have
to take care when passing around mutable objects for this reason (and
there's another gotcha you're very near to by assigning a default value to a
mutable object: that default dict() will be the exact same default dict
every time you call the simpleCut() function with no arguments, instead of
it being a new dictionary everytime).

If you want to duplicate a dictionary, you import the copy module and call
copy.copy(d) (or copy.deepcopy(d) depending on the contents). You can also
pass the old dict to the dict() object to get a copy. I -believe- that's a
shallow copy. E.g, return dict(temp) will make a shallow copy.

--S
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From apt.shansen at gmail.com  Mon Feb  2 19:17:50 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 16:17:50 -0800
Subject: function scope
In-Reply-To: <49878C27.6010204@mrabarnett.plus.com>
References: <49878466.9010503@gmail.com> <49878C27.6010204@mrabarnett.plus.com>
Message-ID: <7a9c25c20902021617p270f563dy71b606301624ddd8@mail.gmail.com>

> If you want a copy when you have
> to do so explicitly with "temp=d.copy()".


Or that! I forgot about that method. :)

Curiously, in 160k lines of code, I haven't explicitly copied a dictionary
once. I find that odd.

--S
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From digitig at gmail.com  Mon Feb  2 19:28:01 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 3 Feb 2009 00:28:01 +0000
Subject: is python Object oriented??
In-Reply-To: <da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902021628u4be2350u22d6d637ee0cae1a@mail.gmail.com>

2009/2/2 Russ P. <Russ.Paielli at gmail.com>:
> On Feb 2, 2:46 pm, Tim Rowe <digi... at gmail.com> wrote:

>> No, we're supposed to believe that the designers of C++, Java, Ada,
>> and Scala are all designers of languages that are not Python. If all
>> languages had the same philosophy what would be the point of different
>> languages? Is it worth mentioning (again) that Python is not Java?
>>
>> --
>> Tim Rowe
>
> I am not sure why people keep "mentioning" that "Python is not Java."

Because Java is the language that folks most offen insist Python become like.

> As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
> either. All of those languages have enforced access restriction. Why
> only mention Java?

You might notice that I also mentioned C++, Ada and Scala.

> their wishes. If that's the case, you have my sympathies, but let's
> not pretend that Java is the only popular OO language with enforced
> access restrictions.

You might notice (again) that I also mentioned C++, Ada and Scala.

-- 
Tim Rowe


From rhodri at wildebst.demon.co.uk  Mon Feb  2 19:35:28 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 00:35:28 -0000
Subject: is python Object oriented??
In-Reply-To: <005201c98549$d3eb74a0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
Message-ID: <op.uoq2lefha8ncjz@gnudebst>

On Mon, 02 Feb 2009 13:54:08 -0000, Hendrik van Rooyen  
<mail at microcorp.co.za> wrote:

> <r...ray at bi...nce.com> wrote:
>> PS: More accurately, Python _embodies_ a philosophy, and to advocate
>> changes that go against that philosophy is to advocate changing
>> Python into something that would no longer be Python.  You can do
>> that, but you aren't likely to get the community to follow you.
>
> *sits on his hands to try to avoid the tangent, with the gaping hole of  
> religion
> looming beneath the spiderweb of philosophy, and the language spec  
> gathering
> dust in the corner, forgotten and forlorn*

This really, really, *really* isn't a tangent.  It's the heart of
the matter.  You are advocating a change that doesn't fit with
Python's "consenting adults" approach to programming.  It's trivial
to enforce hiding using static checking tools if you really feel the
need to not trust yourself; it's much harder (though by no means
impossible) to break language-enforced hiding when (not if) an
interface turns out to be inadequate.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From mrmakent at cox.net  Mon Feb  2 19:37:07 2009
From: mrmakent at cox.net (Mike Kent)
Date: Mon, 2 Feb 2009 16:37:07 -0800 (PST)
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
Message-ID: <cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>

On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:

> def simpleCut(d=dict()):
> ? ? ? ?temp=d
> ? ? ? ?for i in temp.keys():
> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
> ? ? ? ? ? ? ? temp[i]=new_value
> return temp

You have been bitten by the shared default parameter noobie trap:
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects


From denis.kasak at gmail.com  Mon Feb  2 19:50:34 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Tue, 3 Feb 2009 01:50:34 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <39e19a010902021650v2a03a293le1e9b67fabd3fac7@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:43 PM, Lionel <lionel.keene at gmail.com> wrote:

<snip>

> >>> ResourcefilePath
> 'C:\\C8Example1.slc.rsc'

<snip>

> C:\C8Example1.slc.src

The extension you used in the interactive shell differs from the one
you used in the class code (i.e. "rsc" vs "src").

-- 
Denis Kasak


From bignose+hates-spam at benfinney.id.au  Mon Feb  2 20:00:18 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 03 Feb 2009 12:00:18 +1100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <87y6woz659.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <874ozd3cr3.fsf at benfinney.id.au>,
> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >aahz at pythoncraft.com (Aahz) writes:
> >>
> >> Just to register a contrary opinion: I *hate* syntax highlighting
> >
> >On what basis?
> 
> It makes my eyes bleed

Okay. I'll tick the ?irrational objection? box and move on, then.

-- 
 \     Q: ?I've heard that Linux causes cancer...? Torvalds: ?That's a |
  `\         filthy lie. Besides, it was only in rats and has not been |
_o__)                           reproduced in humans.? ?Linus Torvalds |
Ben Finney


From lionel.keene at gmail.com  Mon Feb  2 20:01:53 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 17:01:53 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<mailman.8662.1233622236.3487.python-list@python.org>
Message-ID: <1f19d002-5a2e-45ab-9401-caf9ac967fea@g3g2000pre.googlegroups.com>

On Feb 2, 4:50?pm, Denis Kasak <denis.ka... at gmail.com> wrote:
> On Mon, Feb 2, 2009 at 10:43 PM, Lionel <lionel.ke... at gmail.com> wrote:
>
> <snip>
>
> > >>> ResourcefilePath
> > 'C:\\C8Example1.slc.rsc'
>
> <snip>
>
> > C:\C8Example1.slc.src
>
> The extension you used in the interactive shell differs from the one
> you used in the class code (i.e. "rsc" vs "src").
>
> --
> Denis Kasak

Yes, I see the problem now. Thank you everyone!

-L


From psteiger at dcc.ufba.br  Mon Feb  2 20:16:50 2009
From: psteiger at dcc.ufba.br (Patrick Steiger)
Date: Mon, 2 Feb 2009 22:16:50 -0300
Subject: what IDE is the best to write python?
In-Reply-To: <6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
	<6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>
Message-ID: <909ef3300902021716s2b4d2177o9954e349abd82402@mail.gmail.com>

2009/2/2 Joe Riopel <goon12 at gmail.com>

> I typically use vim/vi, because it's usually already installed on the
> OS's I work with and vim for Windows works the same. Also, using the
> same editor across these different OS's, I don't have to worry too
> much soft/hard tabs.


 You shouldn't even think about hard tabs, and you should default all your
editors to soft tabs.


-- 
"I May Be the Walrus."
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From gagsl-py2 at yahoo.com.ar  Mon Feb  2 20:17:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 23:17:19 -0200
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gm70fg$l49$1@ger.gmane.org>
	<mailman.8607.1233587896.3487.python-list@python.org>
	<49871c5b$0$4087$ba4acef3@news.orange.fr>
Message-ID: <op.uoq4i5kpx6zn5v@gabriel2.softlabbsas.com.ar>

En Mon, 02 Feb 2009 14:21:29 -0200, m.banaouas  
<banaouas.medialog at wanadoo.fr> escribi?:

> My python version is 2.4.4
>
> def SubElement(parent, tag, attrib={}, **extra):
>
> Can you tell me how does "parent" issue could be solved by SubElement ?

Simply because you *have* to pass a parent to the function...

> I'm looking for how to determine element parent just by asking element  
> it self.

There isn't a way -- and there are good reasons. One is memory management  
(it would create reference cycles, and they aren't efficiently removed).  
Another one is that it prevents an element to be shared between containers.

> My goal is to clone an element and attach it to a specified parent or to  
> parant of original element to clone.

Then pass the desired parent as the "parent" argument.

En Mon, 02 Feb 2009 13:52:59 -0200, Gerard Flanagan <grflanagan at gmail.com>
escribi?:

> Not sure what SubElement gains you, in the context of the above function?

Just because Element and SubElement are documented as the recommended way  
to create Element instances. Also, I was under the impression that  
makeelement did not make a copy of its "attrib" argument, so it would end  
being shared by other instances too -- but it isn't the case actually.

-- 
Gabriel Genellina



From mdw at distorted.org.uk  Mon Feb  2 20:19:21 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 01:19:21 +0000
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
	<7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>
Message-ID: <87wsc8mi5i.fsf.mdw@metalzone.distorted.org.uk>

John Machin <sjmachin at lexicon.net> writes:

> 3 can be represented in 2 bits and at the same time -3 can be
> represented in 2 bits?? But 2 bits can support only 2 ** 2 == 4
> different possibilities, and -3 .. 3 is 7 different integers.

Yeah, I made some arbitrary choices about what to do with non-positive
inputs.  If you prefer other answers, use 'em.  My ones work well with
signed-magnitude representations where the sign is stored separately.

>> ? ## Find upper bound of the form 2^(2^n) >= x.
>
> Possibly you mean 2 ** ( 2 ** n) >= x

I write maths in comments, not Python.  Feel lucky I didn't write it in
LaTeX.

-- [mdw]


From jervisau at gmail.com  Mon Feb  2 20:35:32 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Tue, 3 Feb 2009 12:35:32 +1100
Subject: what IDE is the best to write python?
In-Reply-To: <20090202034654.GD30237@turki.gavron.org>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<20090202034654.GD30237@turki.gavron.org>
Message-ID: <8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:46 PM, Chris Jones <cjns1989 at gmail.com> wrote:
> On Sun, Feb 01, 2009 at 07:26:24PM EST, Ben Finney wrote:
>> aahz at pythoncraft.com (Aahz) writes:
>>
>> > Just to register a contrary opinion: I *hate* syntax highlighting
>>
>> On what basis?
>
> Real men hate syntax highlighting.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

real programmers use ed.

http://www.gnu.org/fun/jokes/ed.msg.html


From rhodri at wildebst.demon.co.uk  Mon Feb  2 20:40:37 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 01:40:37 -0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
Message-ID: <op.uoq5lze6a8ncjz@gnudebst>

[Quoting restored for reduced

On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.keene at gmail.com> wrote:

> On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>
>> >> This is written very slowly, so you can read it better:
>>
>> > Please post without sarcasm.

On Usenet?  You'll be wanting single unequivocal answers next!

Seriously though, you had been asked several times for the traceback,
so that we could stop guessing and tell you for sure what was going
on, and you hadn't provided it.  Diez's mild sarcasm was not uncalled-
for.  The fact that you didn't have a traceback partially excuses you,
but it would have helped if you'd said so.

>>
>> > This is the output from my Python shell:
>>
>> > >>> DatafilePath = "C:\\C8Example1.slc"
>> > >>> ResourcefilePath = DatafilePath + ".rsc"
>> > >>> DatafileFH = open(DatafilePath)
>> > >>> ResourceFh = open(ResourcefilePath)
>> > >>> DatafilePath
>>
>> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>>
>> > 'C:\\C8Example1.slc.rsc'
>>
>> > It seems to run without trouble. However, here is the offending code
>> > in my class (followed by console output):
>>
>> > class C8DataType:
>>
>> > ? ? def __init__(self, DataFilepath):
>>
>> > ? ? ? ? try:
>> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>>
>> > ? ? ? ? except IOError, message:
>> > ? ? ? ? ? ? # Error opening file.
>> > ? ? ? ? ? ? print(message)
>> > ? ? ? ? ? ? return None

You're catching the IOError, presumably so that you can fail
gracefully elsewhere.  This may not be a particularly good
idea, and in any case it stops the exception reaching the
console where it would cause the traceback to be displayed.
More on this later.

>> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"

As other people have pointed out, you've got a typo here.

>> > ? ? ? ? print(DataFilepath)
>> > ? ? ? ? print(ResourceFilepath)
>>
>> > ? ? ? ? # Try to open resource file, catch exception:
>> > ? ? ? ? try:
>> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>>
>> > ? ? ? ? except IOError, message:
>> > ? ? ? ? ? ? # Error opening file.
>> > ? ? ? ? ? ? print(message)
>> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
>> > ? ? ? ? ? ? DataFH.close()
>> > ? ? ? ? ? ? return None

[Huge amounts of text trimmed]

Fair enough, you're catching the IOError so that you can
ensure that DataFH is closed.  Unfortunately this concealed
the traceback information, which would have made it more
obvious to you what people were talking about.  Given that
this has rather stuffed your C8DataType instance, you
might want to think about re-raising the exception after
you've closed DataFH and letting the outer layers deal
with it in a more appropriate fashion.

Incidentally, this code isn't going to do anything useful
for you anyway even after you've fixed the typo.  DataFH
and ResourceFH are both local variables to __init__ and
will be tossed away when it finishes executing.  If you
want to use them later, make them self.data_fh and
self.resource_fh respectively.

(PEP 8 recommends that you use lower_case_with_underscores
for variable or attribute names, and leave MixedCase for
class names.)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Mon Feb  2 20:47:28 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 01:47:28 -0000
Subject: key capture
In-Reply-To: <4986CEC1.6060209@wildenhain.de>
References: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
	<4986CEC1.6060209@wildenhain.de>
Message-ID: <op.uoq5s0zwa8ncjz@gnudebst>

On Mon, 02 Feb 2009 10:45:21 -0000, Tino Wildenhain <tino at wildenhain.de>
wrote:

> Hi,
>
> swamynathan wrote:
>> hello,
>> im making a virtual piano in python where on key stroke a wav is played
>> from a location
>> now to implement  a fully functional piano i need to have multiple key
>> stroke captures  ie if 2 or 3 keys pressed then the function which
>> playes the wav is called with 3 parameters
>
>
>> how to implement this or any other suggestion(i was asked to try multi
>> threading which dint seem optimal)
>
> Are you trying to do this with a computer keyboard or with an
> attached midi or usb music keybord? If the former, you are probably
> w/o luck because afaik there is no way to track the event
> of having random keys pressed the same time.

Yes there is.  You need to use one of the GUIs (Tkinter, wxPython,
PyGame, etc), all of which will give you Key Down/Key Up events.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gotbyrd at gmail.com  Mon Feb  2 21:02:46 2009
From: gotbyrd at gmail.com (gotbyrd)
Date: Mon, 2 Feb 2009 18:02:46 -0800 (PST)
Subject: Searching a file for multiple strings
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<mailman.8479.1233431134.3487.python-list@python.org>
Message-ID: <a8547f73-c187-4df4-badb-1e32528133d7@r34g2000vbp.googlegroups.com>

On Jan 31, 2:45?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > I'm fairly new with python and am trying to build a fairly simple
> > search script. ?Ultimately, I'm wanting to search a directory of files
> > for multiple user inputted keywords. ?I've already written a script
> > that can search for a single string through multiple files, now I just
> > need to adapt it to multiple strings.
>
> > I found a bit of code that's a good start:
>
> > import re
> > test = open('something.txt', 'r').read()
>
> > list = ['a', 'b', 'c']
>
> > foundit = re.compile('|'.join(re.escape(target) for target in list))
> > if foundit.findall(test):
> > ? ? print 'yes!'
>
> > The only trouble with this is it returns yes! if it finds any of the
> > search items, and I only want a return when it finds all of them. ?Is
> > there a bit of code that's similar that I can use?
>
> [insert standard admonition about using "list" as a variable
> name, masking the built-in "list"]
> Unless there's a reason to use regular expressions, you could
> simply use
>
> ? ?test = open("something.txt").read()
> ? ?items = ['a', 'b', 'c']
> ? ?if all(s in test for s in items):
> ? ? ?print "Yes!"
> ? ?else:
> ? ? ?print "Sorry, bub"
>
> This presumes python2.5 in which the "all()" function was added.
> ? Otherwise in pre-2.5, you could do
>
> ? ?for s in items:
> ? ? ?if s not in test:
> ? ? ? ?print "Sorry, bub"
> ? ? ? ?break
> ? ?else:
> ? ? ?print "Yeparoo"
>
> (note that the "else" goes with the "for", not the "if")
>
> -tkc

Thanks, Tim.  What you suggested worked perfectly!

Jason


From gotbyrd at gmail.com  Mon Feb  2 21:05:37 2009
From: gotbyrd at gmail.com (gotbyrd)
Date: Mon, 2 Feb 2009 18:05:37 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
Message-ID: <26622f01-2418-442d-91c2-0f026d571edd@35g2000pry.googlegroups.com>

On Jan 31, 11:39?pm, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Sat, Jan 31, 2009 at 3:00 PM, Tim Chase
>
> <python.l... at tim.thechases.com> wrote:
> >>> I'm fairly new with python and am trying to build a fairly simple
> >>> search script. ?Ultimately, I'm wanting to search a directory of files
> >>> for multiple user inputted keywords. ?I've already written a script
> >>> that can search for a single string through multiple files, now I just
> >>> need to adapt it to multiple strings.
>
> Not to discourage the use of Python, but it seems that fgrep with the
> -f flag already does exactly what you want. If you're on Windows, you
> can get the Windows version of fgrep here:http://unxutils.sourceforge.net/
>
> Shawn

Shawn,

Thanks for your suggestion, but the office I work in has python 2.4 on
its workstations and we're prohibited from installing outside
software.  Learning to use python was quicker than getting the IT
staff to approve adding new software :)

Jason



From lionel.keene at gmail.com  Mon Feb  2 21:08:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 18:08:49 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
Message-ID: <22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>

On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> [Quoting restored for reduced
>
> On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> >> >> This is written very slowly, so you can read it better:
>
> >> > Please post without sarcasm.
>
> On Usenet? ?You'll be wanting single unequivocal answers next!
>
> Seriously though, you had been asked several times for the traceback,
> so that we could stop guessing and tell you for sure what was going
> on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> for. ?The fact that you didn't have a traceback partially excuses you,
> but it would have helped if you'd said so.
>
>
>
>
>
>
>
> >> > This is the output from my Python shell:
>
> >> > >>> DatafilePath = "C:\\C8Example1.slc"
> >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> >> > >>> DatafileFH = open(DatafilePath)
> >> > >>> ResourceFh = open(ResourcefilePath)
> >> > >>> DatafilePath
>
> >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> >> > 'C:\\C8Example1.slc.rsc'
>
> >> > It seems to run without trouble. However, here is the offending code
> >> > in my class (followed by console output):
>
> >> > class C8DataType:
>
> >> > ? ? def __init__(self, DataFilepath):
>
> >> > ? ? ? ? try:
> >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> >> > ? ? ? ? except IOError, message:
> >> > ? ? ? ? ? ? # Error opening file.
> >> > ? ? ? ? ? ? print(message)
> >> > ? ? ? ? ? ? return None
>
> You're catching the IOError, presumably so that you can fail
> gracefully elsewhere. ?This may not be a particularly good
> idea, and in any case it stops the exception reaching the
> console where it would cause the traceback to be displayed.
> More on this later.
>
> >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> As other people have pointed out, you've got a typo here.
>
> >> > ? ? ? ? print(DataFilepath)
> >> > ? ? ? ? print(ResourceFilepath)
>
> >> > ? ? ? ? # Try to open resource file, catch exception:
> >> > ? ? ? ? try:
> >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> >> > ? ? ? ? except IOError, message:
> >> > ? ? ? ? ? ? # Error opening file.
> >> > ? ? ? ? ? ? print(message)
> >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> >> > ? ? ? ? ? ? DataFH.close()
> >> > ? ? ? ? ? ? return None
>
> [Huge amounts of text trimmed]
>
> Fair enough, you're catching the IOError so that you can
> ensure that DataFH is closed. ?Unfortunately this concealed
> the traceback information, which would have made it more
> obvious to you what people were talking about. ?Given that
> this has rather stuffed your C8DataType instance, you
> might want to think about re-raising the exception after
> you've closed DataFH and letting the outer layers deal
> with it in a more appropriate fashion.
>
> Incidentally, this code isn't going to do anything useful
> for you anyway even after you've fixed the typo. ?DataFH
> and ResourceFH are both local variables to __init__ and
> will be tossed away when it finishes executing. ?If you
> want to use them later, make them self.data_fh and
> self.resource_fh respectively.
>
> (PEP 8 recommends that you use lower_case_with_underscores
> for variable or attribute names, and leave MixedCase for
> class names.)
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> - Show quoted text -

Very good comments. I'll be implementing some of your suggestions, to
be sure. Thanks Rhodri.


From mdw at distorted.org.uk  Mon Feb  2 21:14:49 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 02:14:49 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <87skmwmfl2.fsf.mdw@metalzone.distorted.org.uk>

"Russ P." <Russ.Paielli at gmail.com> writes:

> I am not sure why people keep "mentioning" that "Python is not Java."
> As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
> either. All of those languages have enforced access restriction. Why
> only mention Java?

Because Java is a well-known member of a family of object-oriented
languages (or at least languages supporting object-oriented
programming).  `Python is not Java' is somewhat of a slogan, intended to
convey the message that Python, quite intentionally, does not behave in
the same way as other languages you may be familiar with.

Smalltalk's visibility features are very different from C++ and Java: a
method can mess with its own object's (i.e., the recipient of the
message which caused the method to be invoked) instance variables but no
others -- a restriction enforced syntactically, since there is simply no
way of referring to a different instance's variables.  There is no
restriction whatever on sending messages to other objects.  Self
abandons the concept of instance variable (and of class, for that
matter), and access controls with it.

The Common Lisp Object System provides no access control features
(though one could probably implement some using the MOP, were one
sufficiently motivated); however, CL's package system is better placed
for this job anyway.  Other object systems for Lisp-family languages
tend to be similar.  The Lisp Machine's Flavors -- the first object
system with multiple inheritance -- relied on the package system for
access control; CLOS-like systems for Scheme, which lacks packages, tend
not to bother at all.  (The package system controls the mapping from
tokens read from, say, files to symbols; packages can export some of
their symbols, so you can refer to, say, MDW:FOO if package MDW exports
symbol FOO, or you can `use' package MDW in your own package to make FOO
refer to MDW:FOO.  The package system tries to keep you honest rather
than acting as an enforcement mechanism: even if MDW doesn't export BAR,
you can still talk about MDW::BAR -- note the double-colon -- as much as
you like.  Working at the name-to-symbol level allows the package system
to operate uniformly on all the various namespaces in Lisp.)

Perl's object system provides no access controls.  Ruby does, following
Simula, though it uses C++-ish `private' for Simula's `hidden'.

> If that's the case, you have my sympathies, but let's not pretend that
> Java is the only popular OO language with enforced access
> restrictions.

No, but let's not pretend either that such features are essential to
object orientation, or that they are even typical of object systems
outside of a particular (admittedly popular) subfamily.

-- [mdw]


From Russ.Paielli at gmail.com  Mon Feb  2 21:16:01 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 18:16:01 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
Message-ID: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>

On Feb 2, 4:35 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:

> This really, really, *really* isn't a tangent.  It's the heart of
> the matter.  You are advocating a change that doesn't fit with
> Python's "consenting adults" approach to programming.  It's trivial
> to enforce hiding using static checking tools if you really feel the
> need to not trust yourself; it's much harder (though by no means
> impossible) to break language-enforced hiding when (not if) an
> interface turns out to be inadequate.

Here we go again. If you have access to the source code (as you nearly
always do with Python code), then "breaking the language-enforced data
hiding" is a trivial matter of deleting the word "private" (or
equivalent).

I know ... changing one word constitutes a "fork." Yeah, right. You
can't be bothered to change one word, but the library developer should
be required to litter his code with leading underscores everywhere,
and large development teams should depend on labor intensive code
reviews for checks that could be automated by the language. (And,
please ... I am not suggesting that enforced access restrictions would
render code reviews unnecessary, but it could certainly simplify
them.)


From ianand0204 at gmail.com  Mon Feb  2 21:25:37 2009
From: ianand0204 at gmail.com (flagg)
Date: Mon, 2 Feb 2009 18:25:37 -0800 (PST)
Subject: Code critique xmlrpclib
Message-ID: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>

This xmlrpc server is designed to parse dns zone files and then
perform various actions on said files. \
It uses dnspython, and xmlrpclib
 I'd like to know what some of the more experienced python users
think. Where I could improve code, make it more efficient, whatever.
All suggestions are welcome.  This is my first functional python
program,  and I have tons of questions to go along with whatever
suggestions.   How could I do sanity checking; right now nothing
checks the input to these functions, error-handling in this program is
almost non-existant how do you integrate decent error handling into a
piece of software......ill shut up now.

Thanks


import dns.zone
from time import localtime, strftime, time
import os, sys
from dns.rdataclass import *
from dns.rdatatype import *
from string import Template
import xmlrpclib
from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler


zoneDir = "/dns"

def openZoneFile(zoneFile):
    """
    Opens a zone file.  Then reads in zone file to dnspython zone
object.
    """
    global zone
    global host
    global domain
    domain = ".".join(zoneFile.split('.')[1:])
    host = ".".join(zoneFile.split('.')[:1])

    try:
            zone = dns.zone.from_file(zoneDir + domain + '.zone',
domain)
    except dns.exception, e:
            print e.__class__, e

class DNSFunctions:

     # Not exposed to xml-rpc calls, used internally only.
    def _writeToZoneFile(self, record):
        """
        Checks if zone file exists, if it does it write values to zone
file
        """

        for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
            new_serial = int(strftime('%Y%m%d00', localtime(time())))
            if new_serial <= rdata.serial:
                new_serial = rdata.serial + 1
            rdata.serial = new_serial

        if os.path.exists(zoneDir + str(zone.origin) + "zone"):
            f = open(zoneDir + str(zone.origin) + "zone", "w")
            zone.to_file(f)
            f.close()
        else:
            print "Zone: " + zone.origin + " does not exist, please
add first"

    def showRecord(self, record):
        """
        Shows a record for a given zone. Prints out
        TTL, IN, Record Type, IP
        """

        openZoneFile(record)

        try:
            rdataset = zone.get_node(host)
            for rdata in rdataset:
                return str(rdata)
        except:
            raise Exception("Record not found")


    def changeRecord(self, record, type, target):
        """
        Changes a dns entry.
        @param record: which record to chance
        @param type:  what type of record, A, MX, NS, CNAME
        @target: if CNAME target points to HOSTNAME, if A record
points to IP
        """
        openZoneFile(record)
        try:
            rdataset = zone.find_rdataset(host, rdtype=type)
        except:
            raise Exception("You must enter a valid record and type.
See --usage for examples")

        for rdata in rdataset:
            if rdata.rdtype == CNAME:
                rdata.target = dns.name.Name((target,))
            elif rdata.rdtype == A:
                rdata.address = target
            else:
               assert False

        self._writeToZoneFile(host)


    def deleteRecord(self, record):
        """
        Delete Entry from zone file
        """
        openZoneFile(record)
        zone.delete_node(host)
        self._writeToZoneFile(record)

    def addRecord(self, record, type, target):
        """
        Adds a new record to zone file
        """
        openZoneFile(record)

        rdataset = zone.find_rdataset(host, rdtype=type, create=True)
        if rdataset.rdtype == A:
            rdata = dns.rdtypes.IN.A.A(IN, A, address = target)
            rdataset.add(rdata, ttl=300)
        elif rdataset.rdtype == CNAME:
            rdata = dns.rdtypes.ANY.CNAME.CNAME(IN, CNAME,
dns.name.Name((target,)))
            rdataset.add(rdata, ttl=300)
        else:
            assert False

        self._writeToZoneFile(host)


    def addZoneFile(self, file):
        """
        Function to create a new empty zone file, if none exists.  If
exists
        function will terminate.
        """
        newZoneSerial =  strftime("%Y%m%d00", localtime())
        zoneTemplate = Template('''$$TTL    ${ttltime}
    $$ORIGIN ${domain}.
    @       5M      IN      SOA     nsrepo1.foobar.priv.
dnsadmin.foobar.priv. (
                            ; did you update reverse?!
                            ${serial}  ; Serial CCYYMMDDxx where xx is
todays edit
                            1H
                            10M
                            1D
                            60M
    )''')

        if not os.path.exists(zoneDir + file + ".zone"):
            f = open(zoneDir + file + ".zone", "w")
            f.write(zoneTemplate.substitute({'ttltime':'300',
'domain': file, 'serial': newZoneSerial}))
            f.close()
        else:
            print "Zone: " + file + " already exists"



class RequestHandler(SimpleXMLRPCRequestHandler):
  #  rpc_paths = ('/RPC2',),
    pass

server = SimpleXMLRPCServer(("localhost", 8080), requestHandler =
RequestHandler, allow_none=True)

print "Listening on port 8080..."

server.register_introspection_functions()
server.register_instance(DNSFunctions())
server.register_multicall_functions()
server.serve_forever()


### Client Script ###
## I will probably use a mix of multicalls and singlecalls<?> for
client activity.  Muticalls will primarily be used for showing a
record, applying a change, then showing the same record again to
verify changes went through.

import xmlrpclib

proxy = xmlrpclib.ServerProxy('http://localhost:8080')
multicall = xmlrpclib.MultiCall(proxy)



print proxy.showRecord('host11.lab0.foobar.priv')
print proxy.showRecord('host12.lab0.foobar.priv')

multicall.showRecord('host11.lab0.foobar.priv')
multicall.changeRecord('host11.lab0.foorbar.priv', 'A', '127.0.0.1')
multicall.showRecord('host11.lab0.foobar.priv')

print proxy.system.listMethods
result = multicall()

print result[1], result[2]



From raykyoto at gmail.com  Mon Feb  2 21:37:55 2009
From: raykyoto at gmail.com (Ray)
Date: Mon, 2 Feb 2009 18:37:55 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
Message-ID: <0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>


Hi all,


On Feb 3, 1:11?am, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 2, 11:51?pm, pyt... at bdurham.com wrote:
>
> > If the output is coming from a print command, couldn't the OP
> > temporarily redirect STDIO to a file to prevent the output from being
> > displayed?
>
> He could, but that'd be a kludge on top of a stuff-up. He should put
> the script-only statements inside
> ? ? if __name__ == '__main__':
> and send the result back to the original author, who may in fact
> appreciate being enlightened :-)
>
> Cheers,
> John


Thanks John and Malcolm!  In my case the first solution would not
work.  Sorry, that my simple "test" example was only a minimal one
which did not reflect the true problem.  The module that I do not want
to edit not only runs on the command line and does some processing,
but also expects arguments.  So, when reading it through importing, it
exits with an error (because no arguments were supplied).

I'll enclose the top-level commands with the if statement above...its
just a minor change, but it seems unavoidable.

Thanks again!

Ray



From john at john-a-harper.com  Mon Feb  2 21:59:29 2009
From: john at john-a-harper.com (John Harper)
Date: Tue, 03 Feb 2009 02:59:29 -0000
Subject: Cross platform compilation?
Message-ID: <gm8buh+ofl4@eGroups.com>

I am trying to build Python to use in an embedded system which uses a 
ppc_440 CPU. The only information I've found is something written by 
Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
seem to have successfully built Python itself, but building the 
extensions fails miserably with complaints about library format. It 
insists on referring to "i686" which is indeed the platform it is 
actually running on.

Before I try to reverse engineer completely setup.py, is there 
something obvious that needs to be done to get it to use the right tool 
chain?

More generally, it seems like this would be something that lots of 
people would want to do. I'm surprised there isn't support for it built 
into the distributed version of Python, without having to hack all the 
setup files...?

Thanks,

John



From grante at visi.com  Mon Feb  2 22:27:21 2009
From: grante at visi.com (Grant Edwards)
Date: Mon, 02 Feb 2009 21:27:21 -0600
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <D72dnTAvf9YEJBrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-02, Russ P. <Russ.Paielli at gmail.com> wrote:

> I am not sure why people keep "mentioning" that "Python is not
> Java." As a slogan, it is rather misleading.

Because other people keep insisting that it ought to be.

> Python is not C++, Ada, or Scala either. All of those
> languages have enforced access restriction. Why only mention
> Java?

It's often mentioned that Python is not C++ as well.

People who know Ada or Scala presumably have a varied enough
background that they find no need insist that all languages
must do things the same way as language X does.

-- 
Grant



From grante at visi.com  Mon Feb  2 22:30:01 2009
From: grante at visi.com (Grant Edwards)
Date: Mon, 02 Feb 2009 21:30:01 -0600
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
	<mailman.8666.1233625242.3487.python-list@python.org>
Message-ID: <D72dnTMvf9akJxrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-03, Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
> [Quoting restored for reduced
>
> On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.keene at gmail.com> wrote:
>
>> On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>>> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>>> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>>
>>> >> This is written very slowly, so you can read it better:
>>>
>>> > Please post without sarcasm.
>
> On Usenet?  You'll be wanting single unequivocal answers next!

ROFL!

> Seriously though, you had been asked several times for the
> traceback, so that we could stop guessing and tell you for
> sure what was going on, and you hadn't provided it.  Diez's
> mild sarcasm was not uncalled- for.  The fact that you didn't
> have a traceback partially excuses you, but it would have
> helped if you'd said so.

The OP might be well served by a careful reading of 

  http://www.catb.org/~esr/faqs/smart-questions.html

-- 
Grant



From rhodri at wildebst.demon.co.uk  Mon Feb  2 22:48:58 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 03:48:58 -0000
Subject: is python Object oriented??
In-Reply-To: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
Message-ID: <op.uorbjwzoa8ncjz@gnudebst>

On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> Here we go again. If you have access to the source code (as you nearly
> always do with Python code), then "breaking the language-enforced data
> hiding" is a trivial matter of deleting the word "private" (or
> equivalent).

If it's that trivial to defeat something that its proponents appear to
want to be close to an iron-clad guarantee, what on earth is the point
of using "private" in the first place?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From kyosohma at gmail.com  Mon Feb  2 22:57:24 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 19:57:24 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
	<22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>
Message-ID: <3f280744-c393-4709-98d7-bf00366178c9@v39g2000pro.googlegroups.com>

On Feb 2, 8:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>
>
>
> > [Quoting restored for reduced
>
> > On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> > >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > >> >> This is written very slowly, so you can read it better:
>
> > >> > Please post without sarcasm.
>
> > On Usenet? ?You'll be wanting single unequivocal answers next!
>
> > Seriously though, you had been asked several times for the traceback,
> > so that we could stop guessing and tell you for sure what was going
> > on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> > for. ?The fact that you didn't have a traceback partially excuses you,
> > but it would have helped if you'd said so.
>
> > >> > This is the output from my Python shell:
>
> > >> > >>> DatafilePath = "C:\\C8Example1.slc"
> > >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > >> > >>> DatafileFH = open(DatafilePath)
> > >> > >>> ResourceFh = open(ResourcefilePath)
> > >> > >>> DatafilePath
>
> > >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > >> > 'C:\\C8Example1.slc.rsc'
>
> > >> > It seems to run without trouble. However, here is the offending code
> > >> > in my class (followed by console output):
>
> > >> > class C8DataType:
>
> > >> > ? ? def __init__(self, DataFilepath):
>
> > >> > ? ? ? ? try:
> > >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > >> > ? ? ? ? except IOError, message:
> > >> > ? ? ? ? ? ? # Error opening file.
> > >> > ? ? ? ? ? ? print(message)
> > >> > ? ? ? ? ? ? return None
>
> > You're catching the IOError, presumably so that you can fail
> > gracefully elsewhere. ?This may not be a particularly good
> > idea, and in any case it stops the exception reaching the
> > console where it would cause the traceback to be displayed.
> > More on this later.
>
> > >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > As other people have pointed out, you've got a typo here.
>
> > >> > ? ? ? ? print(DataFilepath)
> > >> > ? ? ? ? print(ResourceFilepath)
>
> > >> > ? ? ? ? # Try to open resource file, catch exception:
> > >> > ? ? ? ? try:
> > >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > >> > ? ? ? ? except IOError, message:
> > >> > ? ? ? ? ? ? # Error opening file.
> > >> > ? ? ? ? ? ? print(message)
> > >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > >> > ? ? ? ? ? ? DataFH.close()
> > >> > ? ? ? ? ? ? return None
>
> > [Huge amounts of text trimmed]
>
> > Fair enough, you're catching the IOError so that you can
> > ensure that DataFH is closed. ?Unfortunately this concealed
> > the traceback information, which would have made it more
> > obvious to you what people were talking about. ?Given that
> > this has rather stuffed your C8DataType instance, you
> > might want to think about re-raising the exception after
> > you've closed DataFH and letting the outer layers deal
> > with it in a more appropriate fashion.
>
> > Incidentally, this code isn't going to do anything useful
> > for you anyway even after you've fixed the typo. ?DataFH
> > and ResourceFH are both local variables to __init__ and
> > will be tossed away when it finishes executing. ?If you
> > want to use them later, make them self.data_fh and
> > self.resource_fh respectively.
>
> > (PEP 8 recommends that you use lower_case_with_underscores
> > for variable or attribute names, and leave MixedCase for
> > class names.)
>
> > --
> > Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> > - Show quoted text -
>
> Very good comments. I'll be implementing some of your suggestions, to
> be sure. Thanks Rhodri.

You could check to see if the file actually exists using os.path.exists
(). I've found that if I use that in combination with printing the
path variable, I sometimes discover that either my file doesn't exist
or that my path is slightly wrong and thus Python doesn't think my
file exists...

Mike


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  2 23:25:53 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Feb 2009 04:25:53 GMT
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
Message-ID: <pan.2009.02.03.04.25.53@REMOVE.THIS.cybersource.com.au>

On Mon, 02 Feb 2009 16:37:07 -0800, Mike Kent wrote:

> On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:
> 
>> def simpleCut(d=dict()):
>> ? ? ? ?temp=d
>> ? ? ? ?for i in temp.keys():
>> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
>> ? ? ? ? ? ? ? temp[i]=new_value
>> return temp
> 
> You have been bitten by the shared default parameter noobie trap:

No, he has tripped over the assignment-doesn't-make-copies feature. 
Ignore the default value, and consider passing in a dict:


def simpleCut(d=dict()):
? ? temp=d
    # ...

That doesn't make a temporary copy of d, it makes a new name that refers 
to the same dictionary as d. So if you do this:

li = {'x': 1}
f = simpleCut(li)

then

assert f is li

will pass, and he will be surprised and dismayed to discover that 
simpleCut() has side-effects.


Solution: make a copy of the input.


def simpleCut(d=dict()):
    temp = d.copy()
    for i in temp:  # don't need to call keys()
        if (temp[i] == ...):
            temp[i] = new_value
    return temp



-- 
Steven


From timr at probo.com  Mon Feb  2 23:27:03 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 03 Feb 2009 04:27:03 GMT
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>
	<598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com>
Message-ID: <aqhfo4lndptd28f21f2lgoppap5mgcgpca@4ax.com>

vsoler <vicente.soler at gmail.com> wrote:
>
>I'm still interested in learning python techniques. Are there any
>other modules (standard or complementary) that I can use in my
>education?

Are you serious about this?  Are you not aware that virtually ALL of the
Python standard modules are written in Python, and are included in their
full, readable source form in every Python installation?  \Python25\lib in
Windows, /usr/lib/python25 in Linux.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From timr at probo.com  Mon Feb  2 23:29:01 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 03 Feb 2009 04:29:01 GMT
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
Message-ID: <0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>

Mike Kent <mrmakent at cox.net> wrote:
>
>On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:
>
>> def simpleCut(d=dict()):
>> ? ? ? ?temp=d
>> ? ? ? ?for i in temp.keys():
>> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
>> ? ? ? ? ? ? ? temp[i]=new_value
>> return temp
>
>You have been bitten by the shared default parameter noobie trap:
>http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects

Actually, he hasn't.  His problem is more fundamental.

However, this is still a good thing for you to point out now and then.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From kyrie at uh.cu  Mon Feb  2 23:41:23 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 02 Feb 2009 23:41:23 -0500
Subject: is python Object oriented??
In-Reply-To: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
Message-ID: <1233636083.4987caf3011e2@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> I know ... changing one word constitutes a "fork." Yeah, right.

Yeah, right.

> You can't be bothered to change one word, but the library developer should
> be required to litter his code with leading underscores everywhere,

No, instead they will have to litter his code with "private" keywords.

(So now this is about laziness and not wanting to type "_"? The argument gets
weirder and weirder)

> and large development teams should depend on labor intensive code
> reviews for checks that could be automated by the language.

Or, by already existing third party tools that you insist on ignoring.

> (And, please ... I am not suggesting that enforced access restrictions 
> would render code reviews unnecessary, but it could certainly simplify
> them.)

Please, tell, how does it having the checks on the interpreter will simplify
them more than having the checks on an external tool?

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie





From aahz at pythoncraft.com  Tue Feb  3 00:09:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 21:09:58 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au>
Message-ID: <gm8jj6$hfq$1@panix3.panix.com>

In article <87y6woz659.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>aahz at pythoncraft.com (Aahz) writes:
>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>aahz at pythoncraft.com (Aahz) writes:
>>>>
>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>
>>>On what basis?
>> 
>> It makes my eyes bleed
>
>Okay. I'll tick the ???irrational objection??? box and move on, then.

You favor bleeding eyes?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From Russ.Paielli at gmail.com  Tue Feb  3 00:37:57 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 21:37:57 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
Message-ID: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>

On Feb 2, 7:48?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > Here we go again. If you have access to the source code (as you nearly
> > always do with Python code), then "breaking the language-enforced data
> > hiding" is a trivial matter of deleting the word "private" (or
> > equivalent).
>
> If it's that trivial to defeat something that its proponents appear to
> want to be close to an iron-clad guarantee, what on earth is the point
> of using "private" in the first place?
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

If a library developer releases the source code of a library, any user
can trivially "defeat" the access restrictions. But if a team of
developers is checking in code for a project, the leader(s) of the
project can insist that the access restrictions be respected to
simplify the management of interfaces. The larger the team, the more
useful that can be. That's why Java, C++, Ada, Scala, and other
languages have a "private" keyword.


From peter.anderson at internode.on.net  Tue Feb  3 00:40:00 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Tue, 03 Feb 2009 16:40:00 +1100
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <4987D8B0.4030904@internode.on.net>

I have a "thing" about editors; a good editor is my tool of trade! I 
have tried many editors over the years mainly in the MS Windows, Linux 
and IBM mainframe environments. After all this I really like EditPlus 
(and the a slightly lesser extent Textpad). What both have in common is 
their "Clip Library" or "Clip Text" (I think its called in Textpad).

A Clip Library is a simple text file that appears in a side panel next 
to the main edit panel. Double click on a Clip Library element and it is 
automatically pasted into the edit panel at the current cursor position. 
The Clip Library content can also be pased around highlighted text in 
the edit panel.

Here is a simple of an EditPlus Clip Library for what I call a "short 
script":

#T=Short script
^# ^!.py
^# The purpose of this script is

def main():
{code here}

main()

#T=Next Clip Library element


#T= defines the name of the Clip Library element

^# the "^" character must proceed a character that is normally a Clip 
Library syntax character but which you want to use in another context (a 
Python line comment in this case)

^! is the cursor positin after the Clip Library element has been 
inserted, in this case the cursor is positioned to alloy the name of the 
script to be typed

The Clip Library element ends when the Clip Library "parser" finds 
either another element definition or the end of the file.

Clip Libraries are stored in simple text files.

This is such a simple concept but is so very productive. Who needs an 
IDE?. I would love to have a Linux text editor (like Scite or GEdit) 
that could do this.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From ferdinandsousa at gmail.com  Tue Feb  3 01:02:55 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 3 Feb 2009 11:32:55 +0530
Subject: Varibles -- copies and references
Message-ID: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>

Hi

Some weeks back I had been following the thread "Why can't assign to
function call". Today, I saw the "function scope" thread, and decided I
should ask about the behaviour below:

>>>                                                                       #
Simple variables
>>>p=55
>>> q=p
>>> q
55
>>> q=44
>>> p
55
>>>
>>>                                                                       #
In a function
>>> def dd(d):
    del d['key']
    return d

>>> adict={'pramod':'goodboy', 'ferdi':'badboy', 'key':'to be deleted'}
>>> dd(adict)
{'ferdi': 'badboy', 'pramod': 'goodboy'}
>>> adict
{'ferdi': 'badboy', 'pramod': 'goodboy'}                          #
undesirable?
>>>
>>>                                                                       #
In a class
>>>class AA:
    a=111


>>> x=AA()
>>> x.a
111
>>> y=x
>>> y.a
111
>>> y.a=222
>>> x.a
222                                                                       #
undesirable?
>>> z=copy.deepcopy(x)
>>> z.a
222
>>> z.a=444
>>> x.a
222
>>> y.a
222
>>>

Guess the simple types show the expected behaviour (even though they are
technically instances of existing classes). The user defined classes seem to
be references/shallow copies. The "function scope" thread refers to
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objectsto
explain why default parameters should not be modified. But, in the
function example above, the dictionary passed as a variable *in the calling
scope* gets modified.

How can you avoid the dictionary being changed?
Assigning one object to another always creates references? Can you modify
anything in the class def to get a copy? [I have a tingling feeling this is
how the default types (integers, strings etc) are defined]

Thanks and best regards,
Ferdi
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From Russ.Paielli at gmail.com  Tue Feb  3 01:18:20 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 22:18:20 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com> 
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
Message-ID: <cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>

On Feb 2, 9:09?pm, a... at pythoncraft.com (Aahz) wrote:

> You favor bleeding eyes?

If I am going to bleed anywhere, I'd actually prefer it be somewhere
other than the eyes. Well, maybe not the gonads either. That's a tough
call. In any case, I use xemacs, and I've always liked color
highlighting. Not that it really helps much, but it "spices up" the
code and stimulates the eyes and brain. When I see the same code
without color highlighting, it just seems bland, like something is
missing. It seems like just "text" rather than "code."


From aahz at pythoncraft.com  Tue Feb  3 01:20:55 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 22:20:55 -0800
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Address already in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<49855129.9070901@shopzeus.com>
	<mailman.8520.1233493150.3487.python-list@python.org>
	<QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d@posted.usinternet>
Message-ID: <gm8no7$hc2$1@panix3.panix.com>

In article <QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d at posted.usinternet>,
Grant Edwards  <grante at visi.com> wrote:
>On 2009-02-01, Steve Holden <steve at holdenweb.com> wrote:
>
>> I believe this is because Microsoft failed to understand the
>> original meaning of ___________________, and persisted with
>> this ghastly error in the name of backwards compatibility,
>> justifying it by suggesting that _________________________.
>
>Somebody should have cards printed up...

+1 QOTW
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From robert.dm.smith at gmail.com  Tue Feb  3 01:25:41 2009
From: robert.dm.smith at gmail.com (Robert D.M. Smith)
Date: Mon, 2 Feb 2009 22:25:41 -0800
Subject: global variable confusion
Message-ID: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>

I have a question on global variables and how to use them.  I have 2 files;
a.py & b.py

# a.py -----

myvar = { 'test' : '123' }

# -------
# b.py -----

from a import myvar

def test():
     a.myvar = { 'blah' : '456' }

# -----

If I *'import a*' & type *'a.myvar'* it prints 'test' & '123'.

Now, if I *'import b'* & type *'b.test()'* ... does this actually change the
contents of myvar? It seems I have to do *'print b.myvar'* to see the change
but really I want to just simply do* 'print myvar'*. I want to be able to
change myvar anywhere. Please help me grasp this concept.

Thanks in advance.

-- 
  Rob
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From banibrata.dutta at gmail.com  Tue Feb  3 01:31:44 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Tue, 3 Feb 2009 12:01:44 +0530
Subject: rfi : bestpractises for implementing secure policies in python
Message-ID: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>

Hi,
Wondering if it is at-all possible to implement "secure" (s.a. not viewable
/ tunable / tweakable) "Policies" in python ?
Use-cases:
1) License enforcement -- Same application, licensed at differential price
levels, based on various feature-sets.
2) "Parental-Control" enforcement. Application usable, with *all* features
only if adult (a particular user-id) is using, and *restricted* feature set
if a child is using it.
3) Enterprise Policy enforecement -- People from Dept-X shouldn't be able to
use the application feature-set A, but only set B. However, people from
Dept-Y should be able to feature-set A & B.

The question is for what could be a desktop (standalone) python application,
or a hosted (SaaS) application. The target user group includes "Programmers"
and "hackers", so while application need not be Fort Knox (no national
secrets or mission-critical), it need to deter basic-to-moderate hacker
attempts at bypassing policy.

Seeking best-practise advice, including alternatives s.a. mixed-Language
usage (but ideally, multi-platform / portable approaches).

-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From clp2 at rebertia.com  Tue Feb  3 01:47:21 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 22:47:21 -0800
Subject: global variable confusion
In-Reply-To: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
References: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
Message-ID: <50697b2c0902022247i5987f199n3f0b5d3e077379ad@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:25 PM, Robert D.M. Smith
<robert.dm.smith at gmail.com> wrote:
> I have a question on global variables and how to use them.  I have 2 files;
> a.py & b.py
>
> # a.py -----
>
> myvar = { 'test' : '123' }
>
> # -------
> # b.py -----
>
> from a import myvar
>
> def test():
>      a.myvar = { 'blah' : '456' }

test() will fail at runtime with a NameError. You imported only
'myvar' from 'a', not 'a' itself (i.e. there is no variable 'a'
defined with 'b', only the variable 'myvar').
Assuming you changed the import to `import a`, then yes, a.myvar (both
within 'a' itself and when accessed from 'b') would have its value
changed by test().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Tue Feb  3 01:47:41 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 22:47:41 -0800
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <7a9c25c20902022247y13b96c34q95de08644b24293c@mail.gmail.com>

>
> Guess the simple types show the expected behaviour (even though they are
> technically instances of existing classes). The user defined classes seem to
> be references/shallow copies.


I prefer to avoid the term "reference" when talking about Python semantics,
because it tends to make a lot of people get very opinionated on
"call-by-value", "call-by-preference", and such, and how they work in other
languages and it doesn't quite match up to how things work in Python.

In Python every assignment (be it x = y, def foo(): pass, and varieties) are
bindings of Objects to Names.

That's all: there's no copying going on ever. The only time Python copies an
object is if you explicitly copy it.

In this code:

    >>> p=55
    >>> q=p

An int object, 55, is bound to the name 'p' in the first line.
In the second line, the object bound to 'p' (the int object 55) is bound to
the name 'q'

There's no copying going on. At the end of this, you have two names pointing
to the same object.

When you next execute the code:

    >>> q=44

You're binding a different object (the int 44) to the name 'q'. As you show,
'p' is not modified because p and q are not /variables/ really: they're
names that point to objects. That you changed where one name points doesn't
change where another name points.

Things get interesting because Python has two kinds of types: immutable and
mutable types.

The code:

    >>> p = p + 5

Results in the object that 'p' points to being added to the object int 5,
which results in an entirely new object being created (int 60), which is
then bound to the name 'p' again. What looks like changing an int is not
changing the actual int at all, but instead creating new objects and binding
them to the name 'p'. That's because ints (like strings and tuples) are
immutable. Any operation which might appear to change it /does not/ change
it: it returns an entirely new object instead.

    >>> s = "Hello"
    >>> t = s.replace("o", "a")
    >>> s
    'Hello'
    >>> t
    'Hella'

The str.replace operation doesn't change s, it returns a new string object
that has the replace operation performed on it. You can bind the new object
to the same name as the previous one (thus making the previous one be
destroyed if no other names point to them) by

    >>> s = s.replace("o", "a")

For immutable types, when you pass the objects into functions (thus binding
the object to the name specified in the def() line), any changes to the
binding within the def don't propagate outside the function context: because
every change to the names inside the def are not changing the objects
pointed to by the names outside: they're just rebinding the internal names.

People get a confused because if you pass a  mutable object inside a def
function and mutate that object the changes /are/ propagated outside--
because now you have a name inside the function and a name outside the
object both pointing to the same object.

If you want a function to work on a copy of a mutable object passed to it,
and not the real object itself, you must explicitly make a copy of it.

This code:

    >>>class AA:
        a=111
    >>> x=AA()
    >>> x.a
    111
    >>> y=x
    >>> y.a
    111
    >>> y.a=222
    >>> x.a
    222

is demonstrating something else entirely.  A class is made with a name bound
to the classes namespace, called 'a'.

Then you're trying to access an instance's namespace to fetch the object
pointed to by its 'a' name: but with instances, if they do not have a name
of their own they will access their classes bindings instead. If you set an
"a" onto an instance, it won't be seen on another instance because that
instance's 'a' will shadow/override the classes binding.

The reason you see the "undesirable" behavior of a change to y.a showing the
same result of x.a... is because those are the *exact* same instance. You
didn't make a copy of the instance, you just made a new name and bound it to
the same instance. If you want to copy in Python you have to explicitly do
so, via the 'copy' module or any copy methods an object provides.

-breathe-

Hope that helps.

--S
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From gnujohn at gmail.com  Tue Feb  3 01:49:53 2009
From: gnujohn at gmail.com (john)
Date: Mon, 2 Feb 2009 22:49:53 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
	<22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>
	<3f280744-c393-4709-98d7-bf00366178c9@v39g2000pro.googlegroups.com>
Message-ID: <82c91293-32ff-44b5-b6a2-33054f03943d@v5g2000prm.googlegroups.com>

On Feb 2, 7:57?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 8:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
> > On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>
> > > [Quoting restored for reduced
>
> > > On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > > > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> > > >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > > >> >> This is written very slowly, so you can read it better:
>
> > > >> > Please post without sarcasm.
>
> > > On Usenet? ?You'll be wanting single unequivocal answers next!
>
> > > Seriously though, you had been asked several times for the traceback,
> > > so that we could stop guessing and tell you for sure what was going
> > > on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> > > for. ?The fact that you didn't have a traceback partially excuses you,
> > > but it would have helped if you'd said so.
>
> > > >> > This is the output from my Python shell:
>
> > > >> > >>> DatafilePath = "C:\\C8Example1.slc"
> > > >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > > >> > >>> DatafileFH = open(DatafilePath)
> > > >> > >>> ResourceFh = open(ResourcefilePath)
> > > >> > >>> DatafilePath
>
> > > >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > > >> > 'C:\\C8Example1.slc.rsc'
>
> > > >> > It seems to run without trouble. However, here is the offending code
> > > >> > in my class (followed by console output):
>
> > > >> > class C8DataType:
>
> > > >> > ? ? def __init__(self, DataFilepath):
>
> > > >> > ? ? ? ? try:
> > > >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > > >> > ? ? ? ? except IOError, message:
> > > >> > ? ? ? ? ? ? # Error opening file.
> > > >> > ? ? ? ? ? ? print(message)
> > > >> > ? ? ? ? ? ? return None
>
> > > You're catching the IOError, presumably so that you can fail
> > > gracefully elsewhere. ?This may not be a particularly good
> > > idea, and in any case it stops the exception reaching the
> > > console where it would cause the traceback to be displayed.
> > > More on this later.
>
> > > >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > > As other people have pointed out, you've got a typo here.
>
> > > >> > ? ? ? ? print(DataFilepath)
> > > >> > ? ? ? ? print(ResourceFilepath)
>
> > > >> > ? ? ? ? # Try to open resource file, catch exception:
> > > >> > ? ? ? ? try:
> > > >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > > >> > ? ? ? ? except IOError, message:
> > > >> > ? ? ? ? ? ? # Error opening file.
> > > >> > ? ? ? ? ? ? print(message)
> > > >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > > >> > ? ? ? ? ? ? DataFH.close()
> > > >> > ? ? ? ? ? ? return None
>
> > > [Huge amounts of text trimmed]
>
> > > Fair enough, you're catching the IOError so that you can
> > > ensure that DataFH is closed. ?Unfortunately this concealed
> > > the traceback information, which would have made it more
> > > obvious to you what people were talking about. ?Given that
> > > this has rather stuffed your C8DataType instance, you
> > > might want to think about re-raising the exception after
> > > you've closed DataFH and letting the outer layers deal
> > > with it in a more appropriate fashion.
>
> > > Incidentally, this code isn't going to do anything useful
> > > for you anyway even after you've fixed the typo. ?DataFH
> > > and ResourceFH are both local variables to __init__ and
> > > will be tossed away when it finishes executing. ?If you
> > > want to use them later, make them self.data_fh and
> > > self.resource_fh respectively.
>
> > > (PEP 8 recommends that you use lower_case_with_underscores
> > > for variable or attribute names, and leave MixedCase for
> > > class names.)
>
> > > --
> > > Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> > > - Show quoted text -
>
> > Very good comments. I'll be implementing some of your suggestions, to
> > be sure. Thanks Rhodri.
>
> You could check to see if the file actually exists using os.path.exists
> (). I've found that if I use that in combination with printing the
> path variable, I sometimes discover that either my file doesn't exist
> or that my path is slightly wrong and thus Python doesn't think my
> file exists...
>
> Mike

It's weird, right?  But thanks to Grant and Rhodri, from another
newbie (me)
and to everyone else who helps us out.

John  (the "how to ask questions" text is priceless)


From clp2 at rebertia.com  Tue Feb  3 01:53:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 22:53:59 -0800
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <50697b2c0902022253p7d9f1dd6i8e0a3cdcd9364ee8@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:02 PM, Ferdinand Sousa
<ferdinandsousa at gmail.com> wrote:
> Hi
>
> Some weeks back I had been following the thread "Why can't assign to
> function call". Today, I saw the "function scope" thread, and decided I
> should ask about the behaviour below:
>
>>>>                                                                       #
>>>> Simple variables
>>>>p=55
>>>> q=p
>>>> q
> 55
>>>> q=44
>>>> p
> 55
>>>>
>>>>                                                                       #
>>>> In a function
>>>> def dd(d):
>     del d['key']
>     return d
>
>>>> adict={'pramod':'goodboy', 'ferdi':'badboy', 'key':'to be deleted'}
>>>> dd(adict)
> {'ferdi': 'badboy', 'pramod': 'goodboy'}
>>>> adict
> {'ferdi': 'badboy', 'pramod': 'goodboy'}                          #
> undesirable?
>>>>
>>>>                                                                       #
>>>> In a class
>>>>class AA:
>     a=111
>
>
>>>> x=AA()
>>>> x.a
> 111
>>>> y=x
>>>> y.a
> 111
>>>> y.a=222
>>>> x.a
> 222                                                                       #
> undesirable?
>>>> z=copy.deepcopy(x)
>>>> z.a
> 222
>>>> z.a=444
>>>> x.a
> 222
>>>> y.a
> 222
>>>>
>
> Guess the simple types show the expected behaviour (even though they are
> technically instances of existing classes). The user defined classes seem to
> be references/shallow copies. The "function scope" thread refers to
> http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects
> to explain why default parameters should not be modified. But, in the
> function example above, the dictionary passed as a variable *in the calling
> scope* gets modified.
>
> How can you avoid the dictionary being changed?
> Assigning one object to another always creates references? Can you modify
> anything in the class def to get a copy? [I have a tingling feeling this is
> how the default types (integers, strings etc) are defined]

Stephen gave a great summary of the issue; here's another popular
write-up about it: http://effbot.org/zone/call-by-object.htm

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Tue Feb  3 02:04:54 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 23:04:54 -0800
Subject: rfi : bestpractises for implementing secure policies in python
In-Reply-To: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>
References: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>
Message-ID: <7a9c25c20902022304v154dd3a1xd4756dd454ddc7bf@mail.gmail.com>

> Wondering if it is at-all possible to implement "secure" (s.a. not viewable
> / tunable / tweakable) "Policies" in python ?
> Use-cases:
> 1) License enforcement -- Same application, licensed at differential price
> levels, based on various feature-sets.
> 2) "Parental-Control" enforcement. Application usable, with *all* features
> only if adult (a particular user-id) is using, and *restricted* feature set
> if a child is using it.
> 3) Enterprise Policy enforecement -- People from Dept-X shouldn't be able
> to use the application feature-set A, but only set B. However, people from
> Dept-Y should be able to feature-set A & B.
>
> The question is for what could be a desktop (standalone) python
> application, or a hosted (SaaS) application. The target user group includes
> "Programmers" and "hackers", so while application need not be Fort Knox (no
> national secrets or mission-critical), it need to deter basic-to-moderate
> hacker attempts at bypassing policy.
>

2 and 3 are very... domain-specific. You just need to implement some sort of
login procedure where users connect with a credential, and you test those
credential vs rights defined in some configuration. Exactly what the login
mechanism is depends too much on just what you're doing with your app, and
how you define users and roles and privileges as well.

As for 1, what we do is that we distribute our main application code as a
.zip file with PYC's only and no PY's. That's more then sufficient as far as
I'm concerned. If someone knows Python and knows what's going on they can
dig into a pYC and disassemble its bytecode and fiddle.. but I don't care at
that point. Someone's going to get through if they're that determined.

As for determining license enforcement, we provide a system file which
includes several fields that define what the system is capable of doing
according to the given contract/license, then a license file which is just a
checksum of the file with a simple encryption applied to it. When the app
starts it computes a checksum of the system file, decrypts the license and
compares the checksums. If it matches, we continue on.

Its not even close to perfect: someone could find which PYC had the checking
routine and disassemble it to get the key, but... its more then good enough
IMHO. I could get more cryptic and do the decryption in a C module (perhaps
written in Cython) and try to go through more effort obfuscating it... then
they'd have to disassemble an object file and know assembly to get the key.
But that's just "harder". I'm only interested in the casual protection. But
we have a solid relationship with our customers and they all have
maintenance contracts: we keep them loyal and not interested in doing
anything like that primarily by providing continued updates and enhancements
overtime. So we're only really worried about casual tweaking bypassing the
security.

HTH,

--Stephen
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From mail at microcorp.co.za  Tue Feb  3 02:10:45 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:10:45 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>
	<6uoqvrFgh5oeU1@mid.uni-berlin.de>
Message-ID: <015a01c985d5$038efac0$0d00a8c0@hendrik>


"Diez B. Roggisch" <deets at nospam.web.de>

> Your argument would be valid if *any* of the *languages* implementing
> encapsulation would offer that real isolation. None does. So where from
> comes the feeling that this must be something a *language* should offer?
> 
> Sure one could envision a system where each object is running in it's
> micro-process. So far, this hasn't been implemented (to the best of my
> knowledge) - so making assertions about the feasibility & robustness for
> running as well as for developing are somewhat "airy", don't you think?

No.  Not airy.  Hairy, yes.

I suppose the language is a kind of wish list on my part - 
I have spent the last twenty years or so writing stuff like this 
on small processors, in assembler, and I would have loved a 
language that supported it, as well as an operating system 
(and I do not mean stuff like tiny os and others of that ilk), 
but one that really supported fast task switching to make 
the micro tasks less expensive on cheap little processors 
with scarce resources. (8031) I have written various flavours
of my own, (pre emptive, round robin, cooperative) and they 
all suffer from the speed troubles associated with task 
switching on that architecture, but in all cases the performance
was good enough to get the job done.

Most of the stuff really did follow a dataflow model
as I have described, but its all so inextricably intertwined
with the hardware and the requirements of the different 
jobs that it feels kind of hopeless to try to extract general
principles from it, except for obvious stuff like that it works
better if your queues are formal and robust, and that the
messages must contain everything that is required to get
the job done.  If you do this, then there is really no reason
to worry about how some other thing is doing it's job.
In fact if you find yourself peeking at the other task's 
innards, then it means you have to rethink the dataflow,
because you are on the wrong track - that is what I meant
when I talk of "granularity"

I have find that code re use, between different projects,
has in my case been limited to some parts of:

- Task switching code
- The ticker structure to interface to hardware
- Queues, buffers and memory management.
- Utility functions like some simple math and string handling.

Anyway this is getting a bit far away from the python
way, which does not strictly enforce the 'Pure Path' (Tm)
of:

- have loose objects as threads/processes
- send messages between them using clever queueing

So we are extremely unlikely to agree on the importance
of enforced data hiding.

:-)

- Hendrik




From cournape at gmail.com  Tue Feb  3 02:14:47 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 3 Feb 2009 16:14:47 +0900
Subject: is python Object oriented??
In-Reply-To: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
Message-ID: <5b8d13220902022314s7aeab97fx91610bdf89ae73a9@mail.gmail.com>

On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paielli at gmail.com> wrote:
> On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
>> > Here we go again. If you have access to the source code (as you nearly
>> > always do with Python code), then "breaking the language-enforced data
>> > hiding" is a trivial matter of deleting the word "private" (or
>> > equivalent).
>>
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
>>
>> --
>> Rhodri James *-* Wildebeeste Herder to the Masses
>
> If a library developer releases the source code of a library, any user
> can trivially "defeat" the access restrictions. But if a team of
> developers is checking in code for a project, the leader(s) of the
> project can insist that the access restrictions be respected to
> simplify the management of interfaces. The larger the team, the more
> useful that can be. That's why Java, C++, Ada, Scala, and other
> languages have a "private" keyword.

I think a lof of this "discussion" is caused by different usages of
private. My understanding is that you think private is missing in
python because there is no clear different between a member which is
published (part of the API) and one which is not (e.g. whose behavior
may change between different revisions, even minor). I agree the
underscore is not an ideal solution - it is certainly not followed by
all python code out there (not even in python itself - see distutils
for example).

But I think you are overstating the advantage of private for that
usage, at least for C++. In C++, if you have a public class in a
header:

class Foo {
    private:
        int f;
};

It means f is private (cannot be accessed outside Foo instances), but
it is declared in the public header. Actually, when people means this
kind of 'data-hiding', C++ does not bring anything to C itself - after
all, we have used FILE* for years and I have no idea about the FILE
structure.

Maybe I still lack experience, but I find neither _ prefixing nor
private/public/protected a satisfaying way to make clear what is
public API and what is not. In particular, if I have a python package
which does not use _ at all, shall I assume everything is public ?

cheers,

David


From mail at microcorp.co.za  Tue Feb  3 02:19:06 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:19:06 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<7a9c25c20902021012s2bd6bd71lf82310a07a3f194b@mail.gmail.com>
Message-ID: <015b01c985d5$047255e0$0d00a8c0@hendrik>

 Stephen Hansen  wrote:

8< --------- arguments I don't agree with -------------

>P.S. Aiee, this discussion is getting overwhelmingly long. :)

It is indeed and I do actually have other stuff to do so I shall
try to retreat with defiant dignity.

Been fun though, to see the other viewpoints when it started 
getting serious.

:-)

- Hendrik



From kurt.forrester.fec at googlemail.com  Tue Feb  3 02:28:05 2009
From: kurt.forrester.fec at googlemail.com (kurt.forrester.fec at googlemail.com)
Date: Mon, 2 Feb 2009 23:28:05 -0800 (PST)
Subject: MySQLdb and MySQL stored functions
Message-ID: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>

Hello All,


I am running
- Ubuntu 8.10
- Python 2.5.2
- MySQLdb (1, 2, 2, 'final', 0)
- MySQL Server/Client 5.0.67

I am trying to write an authentication script for a python application
that connects to a MySQL database. The database has a table named
`user` which has the fields `id`, `alias` and `password` as well as a
stored function `authenticate` as detailed below:

CREATE DEFINER=`root`@`localhost` FUNCTION `authenticate`(a TEXT, p
TEXT) RETURNS int(11)
BEGIN
DECLARE STATUS INT DEFAULT -1;
SELECT id INTO STATUS FROM user WHERE alias = a AND password = p;
RETURN STATUS;
END

table: `user`
`id` = 1
`alias` = 'captain'
`password' = 'a'

I have been executing the following query from various connections:
`SELECT authenticate('captain', 'a')` (this is what is in the table
and should return 1)
and
`SELECT authenticate('captain', 'aa')` (this is a incorrect version of
the password and should return -1)

I have tried running this query from the MySQL Query Browser and it
returns results as expected.
I have also tried query from python using the _mysql module and this
also returns results as expected.
However, when I try to use the MySQLdb module it returns an incorrect
value (it returns 1).

I wish to use the DB API 2.0 compliant module for flexibility.
Therefore I am trying to work out why the MySQLdb does not return the
value as expected (that is as it is returned by the Query Browser).

Any help would be greatly appreciated.

Kurt


From btaylordesign at gmail.com  Tue Feb  3 02:31:24 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Mon, 2 Feb 2009 23:31:24 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
Message-ID: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>

Hello everyone,

I'm having an issue specifying the path for extracting files from
a .zip archive. In my method, I have:

zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)

What is happening is that the extract method is creating a folder with
the name of 'zip_name' and extracting the files to it. Example:

if 'thumbnail_path' is 'images/inventory/thumbnails/'

extract is creating: 'images/inventory/thumbnails/test1/'

and saving the files out. How can I set the path to be exactly:
'images/inventory/thumbnails'  ?

TIA,
Brandon


From mail at microcorp.co.za  Tue Feb  3 02:31:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:31:37 +0200
Subject: Threading / Queue management
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <015c01c985d5$051106e0$0d00a8c0@hendrik>

 "Power Button" <mjbuchan at gmail.com>

> My question is, how can I create the Queue in my main object and set
> the target function for the Thread Constructor to be a function in
> foo?

Just create it, giving it some name.
Then start the static long running stuff,
and pass the name you gave it.

Pass the name to the thing that starts the 
per transaction thread, so that it can pass
it to the new thread, and away you go.

You may even need an output queue, so that 
the static long running stuff knows what to do 
with the results, and a thread to handle the
final output.

- Hendrik




From apt.shansen at gmail.com  Tue Feb  3 02:53:06 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 23:53:06 -0800
Subject: Problem using compileall
Message-ID: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>

I'm having a slight problem with pre-compiling some files for distribution
that I'm not sure where to even look for.

An excerpt from an output:

    C:\mother\Python24\core\application\sysconfig>python -m compileall .
    Listing . ...
    Compiling .\BulkListClass.py ...
    Sorry: TypeError: ('compile() expected string without null bytes',)
    Compiling .\BulkUserImporter.py ...

The BulkListClass is then not creating a PYC.

Yet, if I:

    C:\mother\Python24\core\application\sysconfig>python
    Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on
win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import BulkListClass

It imports the module fine and made the PYC file.

I'm not sure why compileall is failing to compile that file, yet Python can
import it to do so.

Any suggestions for how to debug this?

This is Python 2.4.3 on Windows Vista.

Thanks.

--S
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From thorsten at thorstenkampe.de  Tue Feb  3 03:38:32 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 09:38:32 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
Message-ID: <MPG.23f220f22aa48ce99897ba@news.individual.de>

* Aahz (2 Feb 2009 09:29:43 -0800)
> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >* Aahz (2 Feb 2009 06:30:00 -0800)
> >> In article <874ozd3cr3.fsf at benfinney.id.au>,
> >> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >>>aahz at pythoncraft.com (Aahz) writes:
> >>>>
> >>>> Just to register a contrary opinion: I *hate* syntax highlighting
> >>>
> >>>On what basis?
> >> 
> >> It makes my eyes bleed
> >
> >Ever tried sunglasses?
> 
> Polarized sunglasses don't work too well with LCD monitors

Well, the answer to your issue with syntax highlighting is to use a 
/decent/ highlighting colour scheme. Don't use that all 
purple/red/green/yellow/blue one. That's for psychedelic trips.

Use a decent colour scheme for adults and you will see that you will 
benefit from syntax highlighting.

Thorsten



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb  3 03:45:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Feb 2009 08:45:23 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
Message-ID: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 03:48:58 +0000, Rhodri James wrote:

> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com>
> wrote:
> 
>> Here we go again. If you have access to the source code (as you nearly
>> always do with Python code), then "breaking the language-enforced data
>> hiding" is a trivial matter of deleting the word "private" (or
>> equivalent).
> 
> If it's that trivial to defeat something that its proponents appear to
> want to be close to an iron-clad guarantee, what on earth is the point
> of using "private" in the first place?

Well, that is a good question.

Since it is even more trivial to defeat Python's private-by-convention 
data hiding, why even bother? Just make everything public. What on earth 
is the point of prefixing an attribute with an underscore?



I think this debate has a lot to do with people's attitudes towards "No 
User Serviceable Parts". Some people are comfortable using black-boxes, 
and if (enforced) data hiding makes it easier for others to build safe, 
efficient black-boxes, then they're willing to give up that a little bit 
of flexibility/freedom for the benefit of safe, efficient black-boxes.

Others prefer white-boxes, and are willing to give up some safety and 
efficiency, and live with increased risk and lower performance, just in 
case some day they might want to open up the white-box and replace the 
widget with a gadget.

Some of us consider that a black-box sealed with regular Phillips head 
screws is still be an effective black-box. It's not hard to find a screw 
driver and open the box, but it's still an effective barrier against 
casual and accidental tinkering while allowing deliberate tinkering.

Others take the attitude that anything short of resistance to oxy torches 
and diamond-tipped drills might as well be in a paper bag, and therefore 
there's no point to black-boxes at all.

I find this extreme position is rather incoherent. If I may paraphrase 
the argument as I see it:

"Enforced data hiding is useless, because it is utterly trivial to bypass 
it, AND it's wicked, because it makes it unbelievably painful and 
difficult to bypass it when you need to."

If it is trivial to bypass, surely it can't be that painful to bypass?

Another extreme position is that enforced data hiding is useless, that 
there is *never* any need for it *at all*, and therefore Python doesn't 
need it, there's no reason except stupid PHB's belief in cargo-cult 
coding why Python couldn't be used for controlling nuclear reactors or 
the Space Shuttle. There's been some claims remarkably close to that in 
this or the previous thread. I trust that nobody really believes this 
extreme position -- it's not that far off claiming that procedures and 
functions are pointless and stupid because we have GOTO.

(The restrictions on GOTOs is analogous to enforced data hiding. We give 
up the freedom and flexibility to jump into the middle of arbitrary 
pieces of code in order to write safer and more maintainable code.)

But as I wrote once before, it is very liberating to program in Python, 
and put responsibility for dealing with errors onto the caller. Let them 
call your methods with invalid arguments, let them mess with your 
internals, if it breaks, it's their responsibility!

Except when it isn't.

And that's when I'd like to be able to lock my classes down and enforce 
data hiding. Not all the time, because I do like white-boxes, but 
sometimes a black-box is the right choice, or the necessary choice, and 
if that makes development harder, then that's a cost I'm willing to pay. 
If I'm not willing to pay it, then I'll leave it as a nice, open, 
transparent white-box with easily messed-with internals and let the 
caller deal with the consequences of messing with the internals.

Whether you agree with that choice or not is irrelevant. *My* code, *my* 
choice: it's my decision to write code as a black-box or a white-box, 
just like it's my choice to use a BSD license or the GPL or a closed-
source proprietary license, or to make the class mutable or immutable.

If other people don't like my choices, well, you have lots of options: 
you can sub-class, you can delegate, you can use somebody else's class, 
you can write your own class, you can do without, you can fork the source 
code, you can make do with it the way it is, or you can complain to the 
Salvation Army[1] about how I'm ruining your programming experience by 
being too strict/not strict enough.

I love Python, and I'm greedy and want it all: I want a dynamic, easy-to-
use language *and* a compiler that can protect me from myself and bad 
data. I'm envious of Haskell's type-inference. I want the option to have 
the compiler warn me when some function is messing with my classes' 
internals as soon as I hit Enter, and not to have to remember to run some 
third-party tool.

I'm not going to *demand* the choice of white-box or black-box classes. I 
don't have the right to demand anything. But I can ask, I can try to make 
my case (to those who will listen), and I refuse to be brow-beaten by 
those who think Python is Just About Perfect Just The Way It Is into 
feeling *ashamed* for wanting that choice.






[1] They give a damn.

-- 
Steven


From thorsten at thorstenkampe.de  Tue Feb  3 03:53:34 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 09:53:34 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
	<cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
Message-ID: <MPG.23f22475a8ca7fd49897bb@news.individual.de>

* Russ P. (Mon, 2 Feb 2009 22:18:20 -0800 (PST))
> On Feb 2, 9:09?pm, a... at pythoncraft.com (Aahz) wrote:
> > You favor bleeding eyes?
> 
> If I am going to bleed anywhere, I'd actually prefer it be somewhere
> other than the eyes. Well, maybe not the gonads either. That's a tough
> call. In any case, I use xemacs, and I've always liked color
> highlighting. Not that it really helps much, but it "spices up" the
> code and stimulates the eyes and brain. When I see the same code
> without color highlighting, it just seems bland, like something is
> missing. It seems like just "text" rather than "code."

Absolutely correct and probably 99% of all programmers see it like that. 
The trick here is to use colour sparingly. This is not only true for 
syntax highlighting but for any kind of highlighting like in prompts and 
ls/dircolors: use it right and your ability to grasp and categorize the 
provided information will improve, use too much colour and you will go 
blind...( ;-) )

Thorsten


From kurt.forrester.fec at googlemail.com  Tue Feb  3 03:55:34 2009
From: kurt.forrester.fec at googlemail.com (kurt.forrester.fec at googlemail.com)
Date: Tue, 3 Feb 2009 00:55:34 -0800 (PST)
Subject: MySQLdb and MySQL stored functions
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>
	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
Message-ID: <0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>

On Feb 3, 8:28?am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Mon, 2 Feb 2009 23:28:05 -0800 (PST),
> kurt.forrester.... at googlemail.com declaimed the following in
> comp.lang.python:
>
> > However, when I try to use the MySQLdb module it returns an incorrect
> > value (it returns 1).
>
> > I wish to use the DB API 2.0 compliant module for flexibility.
> > Therefore I am trying to work out why the MySQLdb does not return the
> > value as expected (that is as it is returned by the Query Browser).
>
> > Any help would be greatly appreciated.
>
> ? ? ? ? Show the code!
>
> ? ? ? ? At a rough guess, given the lack of details...
>
> ? ? ? ? You forgot to .fetch() the result and are looking at the status code
> from the .execute()
> --
> ? ? ? ? Wulfraed ? ? ? ?Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ? ? ? ? ?wulfr... at bestiaria.com
> ? ? ? ? ? ? ? ? HTTP://wlfraed.home.netcom.com/
> ? ? ? ? (Bestiaria Support Staff: ? ? ? ? ? ? ? web-a... at bestiaria.com)
> ? ? ? ? ? ? ? ? HTTP://www.bestiaria.com/

Correct diagnosis.

Thanks.

Any ideas on how to suppress the warning output:
__main__:1: Warning: No data - zero rows fetched, selected, or
processed


From hongyuan1306 at gmail.com  Tue Feb  3 03:56:15 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Tue, 3 Feb 2009 16:56:15 +0800
Subject: urllib2.open always send 'Accept-Encoding: gzip, deflate' under 
	Windows
Message-ID: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>

Hi,

I wish to send a request without 'Accept-Encoding: gzip, deflate' in the
request header. Under Linux, this is not a problem, I got 'Accept-Encoding:
identity' by default.

However, under Windows (XP SP3 with Python 2.5), no matter what I try, I
always got 'Accept-Encoding: gzip, deflate' in the request header. There is
no method in urllib2 to remove or disable the sending of a header. So what I
can do is try to override the miraculously added header, like:

>>> opener = urllib2.build_opener()
>>> opener.addheaders = [('Accept-encoding', 'identity;q=1.0, gzip;q=0')]
>>> opener.open('some test url')

or

>>> request = urllib2.Request('http://www.homemaster.cn',
headers={'Accept-encoding': 'identity'})
>>> urllib2.urlopen(request)

But I always still get the annoying 'gzip, deflate' in the header (captured
by Wireshark). And in the latter case, it seems my 'Accept-encoding':
'identity' is changed into '---------------: --------', presumably because
it clashes with the system generated header of 'gzip, deflate':

GET / HTTP/1.1
Accept-Encoding: gzip, deflate
Host: www.homemaster.cn
User-Agent: Python-urllib/2.5
Connection: close
---------------: --------

Strangely I neither find the string 'gzip, deflate' in urllib2.py nor in
httplib.py. Where does it come and how can I remove it or replace it with
'identity'?

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From ferdinandsousa at gmail.com  Tue Feb  3 03:57:30 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 3 Feb 2009 14:27:30 +0530
Subject: Varibles -- copies and references
Message-ID: <a9be2b70902030057y7fa77ae5id59c9c9818226400@mail.gmail.com>

 People get a confused because if you pass a  mutable object inside a def
function and mutate that object the changes /are/ propagated outside--
because now you have a name inside the function and a name outside the
object both pointing to the same object.

Since tuples  are immutable, I guess passing tuples to functions would
achieve the result desired by me:
result = func ( (anobject) )

If you want a function to work on a copy of a mutable object passed to it,
and not the real object itself, you must explicitly make a copy of it.

Or using deepcopy within the function definition. This would be better as I
could simply pass an object to the function. I don't think there is another
way to make an object mutable by something in the class definition. Is
there?

>>>class AA:
         a=111

>>> x=AA()
>>> x.a
111
>>> y=x
>>> y.a
111
>>> y.a=222
>>> x.a
222                         # undesirable?
>>> z=copy.deepcopy(x)
>>> z.a
222
>>> z.a=444
>>> x.a
222
>>> y.a
222

The reason you see the "undesirable" behavior of a change to y.a showing the
same result of x.a... is because those are the *exact* same instance. You
didn't make a copy of the instance, you just made a new name and bound it to
the same instance. If you want to copy in Python you have to explicitly do
so, via the 'copy' module or any copy methods an object provides.

Could someone please give me an example of how to implement this copy method
for the AA class.

Going the other way:

>>> a=555
>>> d=copy.copy(a)             # Supposed to be a shallow copy
>>> d
555
>>> d=444
>>> a                                  # But, it doesn't change the original
555

Is there any way to get ints/strings to refer to the same object?

Thanks and Regards,
Ferdi
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From Russ.Paielli at gmail.com  Tue Feb  3 04:11:14 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 01:11:14 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <d80224ad-c4de-4c87-b48b-d3536dac1af9@u18g2000pro.googlegroups.com>

On Feb 3, 12:45?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:

> Another extreme position is that enforced data hiding is useless, that
> there is *never* any need for it *at all*, and therefore Python doesn't
> need it, there's no reason except stupid PHB's belief in cargo-cult
> coding why Python couldn't be used for controlling nuclear reactors or
> the Space Shuttle. There's been some claims remarkably close to that in
> this or the previous thread.

My recollection is that several people have said exactly that in no
uncertain terms, if not in this thread then in the one a few days ago.

> I trust that nobody really believes this
> extreme position -- it's not that far off claiming that procedures and
> functions are pointless and stupid because we have GOTO.

If nobody believes it, several participants here could have fooled me.


From thorsten at thorstenkampe.de  Tue Feb  3 04:20:28 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 10:20:28 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <MPG.23f22ac362c6510a9897bc@news.individual.de>

* Russ P. (Mon, 2 Feb 2009 13:51:11 -0800 (PST))
> On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> Several participants here keep repeating that the leading-underscore
> convention is perfectly adequate. Aside from the aesthetic problem of
> littering code with leading underscores, let me try to explain the
> problem with leading underscores.

A leading underscore is not an aesthetic problem - while I would agree 
that /multiple/ leading or trailing underscores are.
 
> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.
> 
> If a "private" keyword (or equivalent) were available, then the change
> would need to be made in only one location rather than at every
> occurrence off the identifier. That is much less error prone. Sure,
> you can argue (as I'm sure someone will) that the users of the library
> should be more careful. Yes they should, but why not let the language
> help with such low-level details. That's what high-level languages are
> for.

This scenario is highly "supposing" and doesn't look like a real-world-
case to me. But anyway: the obvious solution in my humble opinion would 
be to do something like "public_attribute = _private_attribute". But 
that would be too simple, too "unjavaesque", right?!

Thorsten


From thorsten at thorstenkampe.de  Tue Feb  3 04:29:29 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 10:29:29 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <MPG.23f22ce337b4988c9897bd@news.individual.de>

* thmpsn.m.k at gmail.com (Mon, 2 Feb 2009 09:02:13 -0800 (PST))
> On Feb 2, 2:55?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > > This is proven
> > > by your statement above, whereby you are driving a user away,
> > > simply because the language, in one small aspect, does not
> > > give him what he wants, and the tenor of this thread has been
> > > very much: "That's how it is - like it or lump it", and no amount
> > > of careful explanation of why people want the feature has cut
> > > any ice -
> >
> > I'm missing the careful explanation. What I've heard is that the lack
> > of enforced encapsulation is "a danger". What I've heard is that
> > people want it because they've been told they should want it and
> > believe that. Why?
> 
> Who has said the latter? Are you just trying to spread FUD?

No, he's not. He's giving his and other people's impression of the pro-
private group's arguments. They construct cases that do not exist in 
reality or can more-than-easily be avoided.
 
> > There have been no "careful explanations" to answer that, in my mind.
> > And thus my response is: the practical possibility of needing access
> > vastly outweights the theoretical situation that might go bad if
> > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > *forced* encapsulation is pointless.
> 
> I think you've gotten too subjective on this matter. You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.

It's even simpler: "don't use other people's underscores". It couldn't 
get more simple than that. 

> > > It has all the time been countered with statements
> > > about how the proponents of private attributes "don't need it",
> > > (as if they are plain dumb),
> >
> > They don't need it. No one has shown a *real* reason why. The only
> > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > That's not a real reason. If its your project that someone is doing
> > bad in, this is a situation which can be *clearly* specified in a
> > projects policy and coding standards and can be *trivially* tested for
> > with simple static analysis in nearly all cases. The problem is the
> > person and not the code then. There's *countless* other ways that
> > person can do bad if you're allowing them to commit blindly anything
> > into your project.
> 
> Aha! I see this attitude quite often among C/C++ people, regarding
> buffer overflows and uninitialized pointer dereferences: someone will
> say "C and C++ are unsafe languages because they allow you to overrun
> buffers", then a C/C++ zealot will respond "Hire some good
> programmers".
> 
> SAME ATTITUDE.

Not at all. Buffer overflows cannot be easily avoided in C/C++ like 
languages. On the contrary you can easily avoid other people's privates 
by simply not using their underscores. It's really that simple. Even I 
got that - and I'm a really simple guy.

Thorsten


From tjreedy at udel.edu  Tue Feb  3 04:34:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 03 Feb 2009 04:34:30 -0500
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <gm9334$sbd$1@ger.gmane.org>

Ferdinand Sousa wrote:
> Hi
> 
> Some weeks back I had been following the thread "Why can't assign to 
> function call". Today, I saw the "function scope" thread, and decided I 
> should ask about the behaviour below:
> 
>  >>>                                                                       
> # Simple variables
>  >>>p=55
>  >>> q=p
>  >>> q
> 55
>  >>> q=44
>  >>> p
> 55
>  >>>
>  >>>                                                                       
> # In a function
>  >>> def dd(d):
>     del d['key']
>     return d

You both mutated and returned the input object.  This is undesirable.
All built-in functions and methods that mutate an object have a verb for 
a name and return nothing.  (Ok, find an exception if you can, but that 
is the intented convention.)  Statements, of course, also have no 
'return'.  So either

def strip_key(d):
   del d['key']
# or
def stripped_of_key(d):
   newd = dict(d)
   del newd['key']
   return newd

tjr



From marco at sferacarta.com  Tue Feb  3 04:42:06 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 03 Feb 2009 10:42:06 +0100
Subject: is python Object oriented??
In-Reply-To: <MPG.23f22ac362c6510a9897bc@news.individual.de>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
Message-ID: <PjUhl.17853$8Z.4878@tornado.fastwebnet.it>

Thorsten Kampe wrote:

> This scenario is highly "supposing" and doesn't look like a real-world-
> case to me. But anyway: the obvious solution in my humble opinion would 
> be to do something like "public_attribute = _private_attribute". But 
> that would be too simple, too "unjavaesque", right?!

Yes, the use of @property is.. cheating!! Shame on you! :)



From hongyuan1306 at gmail.com  Tue Feb  3 04:48:40 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Tue, 3 Feb 2009 17:48:40 +0800
Subject: urllib2.open always send 'Accept-Encoding: gzip, deflate' under 
	Windows
In-Reply-To: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>
References: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>
Message-ID: <91320d220902030148u5ff6e5awd6fe9728d70da9e7@mail.gmail.com>

Hi,

I got the reason. It has nothing to do with Python and its libraries.

I have Symantec Client Security installed on the test machine, and it is
modifying the content encoding header for outgoing http request, which is a
strange thing. Disable the firewall and the problem goes away.

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From thorsten at thorstenkampe.de  Tue Feb  3 05:11:04 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 11:11:04 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
	<PjUhl.17853$8Z.4878@tornado.fastwebnet.it>
Message-ID: <MPG.23f236a0959e393a9897be@news.individual.de>

* Marco Mariani (Tue, 03 Feb 2009 10:42:06 +0100)
> Thorsten Kampe wrote:
> > This scenario is highly "supposing" and doesn't look like a
> > real-world- case to me. But anyway: the obvious solution in my
> > humble opinion would be to do something like "public_attribute =
> > _private_attribute". But that would be too simple, too
> > "unjavaesque", right?!
> 
> Yes, the use of @property is.. cheating!! Shame on you! :)

"Decorators", right? Never used that, but I read about it...

Thorsten


From dickinsm at gmail.com  Tue Feb  3 05:19:21 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Tue, 3 Feb 2009 02:19:21 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
	<7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>
	<87wsc8mi5i.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <282bf012-2191-4178-8cc1-adfd4fa55431@u18g2000pro.googlegroups.com>

On Feb 3, 1:19?am, Mark Wooding <m... at distorted.org.uk> wrote:
> Yeah, I made some arbitrary choices about what to do with non-positive
> inputs. ?If you prefer other answers, use 'em. ?My ones work well with
> signed-magnitude representations where the sign is stored separately.

Not *that* arbitrary:  they're the same choices that were made
(after some discussion) for the int.bit_length method, which is
what the OP was looking to replace.  They're also identical
to the choices that Mathematica made for its BitLength function...

As Mark says, this seems a natural choice for sign-magnitude
representation, which is what almost every bignum library
seems to use under the hood.

Mark


From Lie.1296 at gmail.com  Tue Feb  3 05:21:56 2009
From: Lie.1296 at gmail.com (Lie)
Date: Tue, 3 Feb 2009 02:21:56 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
Message-ID: <45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>

On Feb 3, 1:37?pm, Ray <rayky... at gmail.com> wrote:
> I'll enclose the top-level commands with the if statement above...its
> just a minor change, but it seems unavoidable.
>
> Thanks again!
>
> Ray

If you really don't want the file to be changed, you could (depends on
the module) use the module as a subprocess. The ideal solution is for
the module to have an if __name__ == '__main__': to determine whether
it is being used as a module or a standalone program though.


From marco at sferacarta.com  Tue Feb  3 05:25:35 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 03 Feb 2009 11:25:35 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
	<cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
Message-ID: <zYUhl.17912$8Z.12831@tornado.fastwebnet.it>

Russ P. wrote:

> highlighting. Not that it really helps much, but it "spices up" the
> code and stimulates the eyes and brain. When I see the same code
> without color highlighting, it just seems bland, like something is
> missing. It seems like just "text" rather than "code."

Plus, it can be configured to induce seizures when the programmer tries 
to write private methods ;)



From stef.mientki at gmail.com  Tue Feb  3 05:38:25 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 3 Feb 2009 11:38:25 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <4987D8B0.4030904@internode.on.net>
References: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
	<4987D8B0.4030904@internode.on.net>
Message-ID: <3dfd60f20902030238i609a1a25w1296c4bb5ff17cd0@mail.gmail.com>

>
>
> Clip Libraries are stored in simple text files.
>
> This is such a simple concept but is so very productive. Who needs an IDE?.
> I would love to have a Linux text editor (like Scite or GEdit) that could do
> this.
>

The code snippet manager, part of a huge IDE, but can be used as a
standalone tool on any OS, might be what your looking for
http://mientki.ruhosting.nl/data_www/pylab_works/pw_code_editor.html
you can find the code here
http://code.google.com/p/pylab-works
cheers,
Stef
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From cd at okunah.de  Tue Feb  3 05:51:40 2009
From: cd at okunah.de (Christof Donat)
Date: Tue, 03 Feb 2009 11:51:40 +0100
Subject: Bitwise 2009 ($5000 prize money)
References: <e3935f02-7353-457a-8b54-65d413edd314@l33g2000pri.googlegroups.com>
Message-ID: <gm97i8$bm9$1@svr7.m-online.net>

Hi,

> http://www.bitwise.iitkgp.ernet.in/

I'm having quite some fun reading the questions since I got this Post in 
comp.lang.c++ before. Here it is of topic and this crosspostings will 
definatelly not be a good advertisement for your contest.

Christof



From bruno.42.desthuilliers at websiteburo.invalid  Tue Feb  3 06:09:46 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 03 Feb 2009 12:09:46 +0100
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>	<005201c98549$d3eb74a0$0d00a8c0@hendrik>	<mailman.8661.1233621338.3487.python-list@python.org>	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <498825f3$0$3303$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Tue, 03 Feb 2009 03:48:58 +0000, Rhodri James wrote:
> 
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com>
>> wrote:
>>
>>> Here we go again. If you have access to the source code (as you nearly
>>> always do with Python code), then "breaking the language-enforced data
>>> hiding" is a trivial matter of deleting the word "private" (or
>>> equivalent).
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
> 
> Well, that is a good question.
> 
> Since it is even more trivial to defeat Python's private-by-convention 
> data hiding, why even bother? Just make everything public. What on earth 
> is the point of prefixing an attribute with an underscore?

To make clear it is *not* part of the API. The point is about enforced 
access restriction, not encapsulation.

> 
> I think this debate has a lot to do with people's attitudes towards "No 
> User Serviceable Parts". Some people are comfortable using black-boxes, 
> and if (enforced) data hiding makes it easier for others to build safe, 
> efficient black-boxes, then they're willing to give up that a little bit 
> of flexibility/freedom for the benefit of safe, efficient black-boxes.
> 
> Others prefer white-boxes, and are willing to give up some safety and 
> efficiency, and live with increased risk and lower performance, just in 
> case some day they might want to open up the white-box and replace the 
> widget with a gadget.

I don't see how this relates to efficiency.

> Some of us consider that a black-box sealed with regular Phillips head 
> screws is still be an effective black-box.

And most of us here go as far as considering that something as simple as 
a "warranty broke if unsealed" label is enough.

> It's not hard to find a screw 
> driver and open the box, but it's still an effective barrier against 
> casual and accidental tinkering while allowing deliberate tinkering.

Idem for a label. You *see* it, don't you ? So you cannot pretend you 
"accidentaly" opened the box.


> Others take the attitude that anything short of resistance to oxy torches 
> and diamond-tipped drills might as well be in a paper bag, and therefore 
> there's no point to black-boxes at all.

straw-man argument once again. No one here says taht there's no point to 
black-box - just that there's no point having to resort to any special 
screw-driver if and when we want to treat it as a white box.

> I find this extreme position is rather incoherent.

It's *your* oversimplification of the point against *enforced* access 
restriction that makes it incoherent.


(snip)

> Another extreme position is that enforced data hiding is useless, that 
> there is *never* any need for it *at all*, and therefore Python doesn't 
> need it, there's no reason except stupid PHB's belief in cargo-cult 
> coding why Python couldn't be used for controlling nuclear reactors or 
> the Space Shuttle.

There may be quite a lot of reasons to think (rightly or not) that 
Python is not suited for such tasks. Anyway, I personnaly don't care 
whether Python would be the right tool for such cases, because - like 
probably more than 99.99% of Python users - that's not what I'm using it 
for, and I don't see any reason to add such useless arbitrary 
restrictions just because 2 or 3 persons claims that it's "how it should 
be". FWIW, since anything dynamic would be considered unsafe in the 
mentioned use cases, the next point would be to make Python as static as 
Java. Yeah, great.

> There's been some claims remarkably close to that in 
> this or the previous thread. I trust that nobody really believes this 
> extreme position -- it's not that far off claiming that procedures and 
> functions are pointless and stupid because we have GOTO.

yet another straw man argument.

> I love Python, and I'm greedy and want it all: I want a dynamic, easy-to-
> use language *and* a compiler that can protect me from myself

That's not what compilers are for.

> and bad 
> data.

I definitly fail to see how a compiler could protect you from *runtime* 
issues ???

> I'm envious of Haskell's type-inference. I want the option to have 
> the compiler warn me when some function is messing with my classes' 
> internals as soon as I hit Enter,

May I remind you that "def" and "class" are executable statements ?

> 
> I'm not going to *demand* the choice of white-box or black-box classes. I 
> don't have the right to demand anything. But I can ask, I can try to make 
> my case (to those who will listen), and I refuse to be brow-beaten by 
> those who think Python is Just About Perfect Just The Way It Is into 
> feeling *ashamed* for wanting that choice.

It's not about Python being "Just About Perfect Just The Way It", it's 
about deciding whether enforced access restriction is of any use (at 
least for a very large majority of it's users), and if it's worth 
imposing design changes so fundamuntal they would just turn Python into 
a totally different language just because a couple guys ask for it.

Anyway: the choice is neither yours nor mine, so all this discussion is 
more than pointless. If you really want such drastic changes in Python's 
design and implementation, submit a PEP.



From mohana2004 at gmail.com  Tue Feb  3 06:53:20 2009
From: mohana2004 at gmail.com (mohana2004 at gmail.com)
Date: Tue, 3 Feb 2009 03:53:20 -0800 (PST)
Subject: Date Comparison
Message-ID: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>

Hi,
I need to compare two dates and find the number of days between those
two dates.This can be done with datetime module in python  as below,
but this is not supported in Jython.

example
from datetime import date
a=datetime.date(2009,2,1)
b=datetime.date(2008,10,10)
c= a-b
c.days
114

Is there any other function to do the same(should be supported by
Jython)

Regards,
Monyl


From crculver at christopherculver.com  Tue Feb  3 08:07:09 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 03 Feb 2009 15:07:09 +0200
Subject: Unzipping a .zip properly, and from a remote URL
Message-ID: <874ozbhdoi.fsf@christopherculver.com>

Returning to Python after several years away, I'm working on a little
script that will download a ZIP archive from a website and unzip it to
a mounted filesystem. The code is below, and it works so far, but I'm
unsure of a couple of things.

The first is, is there a way to read the .zip into memory without the
use of a temporary file? If I do archive = zipfile.ZipFile(remotedata.read())
directly without creating a temporary file, the zipfile module
complains that the data is in the wrong string type.

The second issue is that I don't know if this is the correct way to
unpack a file onto the filesystem. It's strange that the zipfile
module has no one simple function to unpack a zip onto the disk. Does
this code seem especially liable to break?

    try:
        remotedata = urllib2.urlopen(theurl)
    except IOError:
        print("Network down.")
        sys.exit()
    data = os.tmpfile()
    data.write(remotedata.read())
    
    archive = zipfile.ZipFile(data)
    if archive.testzip() != None:
        print "Invalid zipfile"
        sys.exit()
    contents = archive.namelist()

    for item in contents:
        try:
            os.makedirs(os.path.join(mountpoint, os.path.dirname(item)))
        except OSError:
            # OSError means that the dir already exists, but no matter.
            pass
        if item[-1] != "/":
            outputfile = open(os.path.join(mountpoint, item), 'w')
            outputfile.write(archive.read(item))
            outputfile.close()


From sk8in_zombi at yahoo.com.au  Tue Feb  3 08:22:01 2009
From: sk8in_zombi at yahoo.com.au (Mr SZ)
Date: Tue, 3 Feb 2009 05:22:01 -0800 (PST)
Subject: imaplib thread method anomaly
Message-ID: <113545.23852.qm@web54507.mail.re2.yahoo.com>

Hi,

I was looking at the thread functionality of IMAP4rev1 servers with the threading extension. Here is my output with debug=8 :



  02:23.02 > GDJB3 UID THREAD references UTF-8 (SEEN)
  02:23.02 < * THREAD (3)(2)(4)(1)
  02:23.02 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  02:23.03 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  02:23.03 < GDJB3 OK Thread completed.
  02:23.03 	matched r'(?P<tag>GDJB\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('GDJB3', 'OK', 'Thread completed.')
[None]

...


  02:59.22 > CNCF3 THREAD references UTF-8 (SEEN)
  02:59.23 < * THREAD (3)(2)(4)(1)
  02:59.23 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  02:59.23 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  02:59.23 < CNCF3 OK Thread completed.
  02:59.23 	matched r'(?P<tag>CNCF\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('CNCF3', 'OK', 'Thread completed.')
  02:59.23 untagged_responses[THREAD] => ['(3)(2)(4)(1)']
['(3)(2)(4)(1)']


As you can see, the first is a UID command and the second is calling the thread method. Also, the server responses are the same for both. So why is one returning None and the other returning the correct response? I'm using python2.4 and I'm stuck with it as I'm using it in a zope environment.

Regards,
SZ



" life isn't heavy enough,it flies away and floats far above action"


      Make Yahoo!7 your homepage and win a trip to the Quiksilver Pro. Find out more


From tino at wildenhain.de  Tue Feb  3 08:32:55 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 14:32:55 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <874ozbhdoi.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>
Message-ID: <49884787.9010805@wildenhain.de>

Hi,

Christopher Culver wrote:
> Returning to Python after several years away, I'm working on a little
> script that will download a ZIP archive from a website and unzip it to
> a mounted filesystem. The code is below, and it works so far, but I'm
> unsure of a couple of things.
> 
> The first is, is there a way to read the .zip into memory without the
> use of a temporary file? If I do archive = zipfile.ZipFile(remotedata.read())
> directly without creating a temporary file, the zipfile module
> complains that the data is in the wrong string type.

Which makes sense given the documentation (note you can either browse
the HTML online/offline or just use help() within the interpreter/ide:

Help on class ZipFile in module zipfile:

class ZipFile
  |  Class with methods to open, read, write, close, list zip files.
  |
  |  z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=True)
  |
  |  file: Either the path to the file, or a file-like object.
  |        If it is a path, the file will be opened and closed by ZipFile.
  |  mode: The mode can be either read "r", write "w" or append "a".
  |  compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires 
zlib).
  |  allowZip64: if True ZipFile will create files with ZIP64 extensions 
when
  |              needed, otherwise it will raise an exception when this 
would
  |              be necessary.
  |
...

so instead you would use archive = zipfile.ZipFile(remotedata)


> The second issue is that I don't know if this is the correct way to
> unpack a file onto the filesystem. It's strange that the zipfile
> module has no one simple function to unpack a zip onto the disk. Does
> this code seem especially liable to break?
> 
>     try:
>         remotedata = urllib2.urlopen(theurl)
>     except IOError:
>         print("Network down.")
>         sys.exit()
>     data = os.tmpfile()
>     data.write(remotedata.read())
> 
>     archive = zipfile.ZipFile(data)
>     if archive.testzip() != None:
>         print "Invalid zipfile"
>         sys.exit()
>     contents = archive.namelist()
> 
>     for item in contents:
...

here you should check the zipinfo entry and normalize
and clean the path just in case to avoid unpacking a zipfile
with special crafted paths (like /etc/passwd and such)

Maybe also checking for the various encodings (like utf8)
in pathnames makes sense.

The dir-creation could be put into a class with caching
of already existing subdirectories created and recursive
creation of missing subdirectories as well es to make
sure you do not ascend out of your target directory by
accident (or crafted zip, see above).

Regards
Tino
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From deets at nospam.web.de  Tue Feb  3 08:34:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 14:34:09 +0100
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <6uqvehFgpaciU1@mid.uni-berlin.de>

mohana2004 at gmail.com wrote:

> Hi,
> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.
> 
> example
> from datetime import date
> a=datetime.date(2009,2,1)
> b=datetime.date(2008,10,10)
> c= a-b
> c.days
> 114
> 
> Is there any other function to do the same(should be supported by
> Jython)

Use the java API of java.util. That methods like before and after on
date-objects.

Diez


From crculver at christopherculver.com  Tue Feb  3 08:38:09 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 03 Feb 2009 15:38:09 +0200
Subject: Unzipping a .zip properly, and from a remote URL
References: <874ozbhdoi.fsf@christopherculver.com>
	<mailman.8689.1233667986.3487.python-list@python.org>
Message-ID: <87y6wnfxoe.fsf@christopherculver.com>

Tino Wildenhain <tino at wildenhain.de> writes:
> so instead you would use archive = zipfile.ZipFile(remotedata)

That produces the following error if I try that in the Python
interpreter (URL edited for privacy):

>>> import zipfile
>>> import urllib2
>>> remotedata = urllib2.urlopen("http://...file.zip")
>>> archive = zipfile.ZipFile(remotedata)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
    self._GetContents()
  File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
    self._RealGetContents()
  File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
    endrec = _EndRecData(fp)
  File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
    fpin.seek(-22, 2)               # Assume no archive comment.
AttributeError: addinfourl instance has no attribute 'seek'


From alan.isaac at gmail.com  Tue Feb  3 08:49:36 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Tue, 03 Feb 2009 13:49:36 GMT
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <QXXhl.1002$eK2.84@nwrddc01.gnilink.net>

On 2/1/2009 2:42 AM mcheung63 at hotmail.com apparently wrote:
> Hi all
>    what IDE is the best to write python?


http://blog.sontek.net/2008/05/11/python-with-a-modular-ide-vim/

Alan Isaac

PS Also maybe see:

http://vim.sourceforge.net/scripts/script.php?script_id=30

http://www.builderau.com.au/program/python/soa/Extending-Vim-with-Python/0,2000064084,339283181,00.htm

http://www.vim.org/scripts/script.php?script_id=790

http://www.vim.org/scripts/script.php?script_id=2527

http://www.tummy.com/Community/Presentations/vimpython-20070225/vim.html


From simon at mullis.co.uk  Tue Feb  3 08:52:07 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Tue, 3 Feb 2009 14:52:07 +0100
Subject: parse date/time from a log entry with only strftime (and no regexen)
Message-ID: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>

Hi All

I'm writing a script to help with analyzing log files timestamps and have a
very specific question on which I'm momentarily stumped....

I'd like the script to support multiple log file types, so allow a strftime
format to be passed in as a cli switch (default is %Y-%m-%d %H:%M:%S).

When it comes to actually doing the analysis I want to store or discard the
log entry based on certain criteria. In fact, I only need the log line
timestamp.

I'd like to do this in one step and therefore not require the user to supply
a regex aswell as a strftime format:

>>> import datetime
>>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
    data_string[found.end():])
ValueError: unconverted data remains:  this is the remainder of the log line
that I do not care about

>>> repr(p)
NameError: name 'p' is not defined

Clearly the strptime method above can grab the right bits of data but the
string "p" is not created due to the error.

So, my options are:

1 - Only support one log format.

2 - Support any log format but require a regex as well as a strftime format
so I can extract the "timestamp" portion.

3 - Create another class/method with a lookup table for the strftime options
that automagically creates the correct regex to extract the right string
from the log entry... (or is this overly complicated)

4 - Override the method above (strptime) to allow what I'm trying to do).

4 - Some other very clever and elegant solution that I would not ever manage
to think of myself....


Am I making any sense whatsoever?

Thanks

SM

(P.S The reason I don't want the end user to supply a regex for the
timestamin he log-entry is that we're already using 2 other regexes as cli
switches to select the file glob and log line to match....)
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From wmcclain at watershade.net  Tue Feb  3 08:56:09 2009
From: wmcclain at watershade.net (Bill McClain)
Date: 3 Feb 2009 13:56:09 GMT
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <gm9idp02h1t@news4.newsguy.com>

On 2009-02-03, mohana2004 at gmail.com <mohana2004 at gmail.com> wrote:
> Hi,
> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.

There are julian day routines in this astronomy package:

    http://astrolabe.sourceforge.net/

-Bill
-- 
Sattre Press                                    In the Quarter
http://sattre-press.com/                 by Robert W. Chambers
info at sattre-press.com         http://sattre-press.com/itq.html


From simon at brunningonline.net  Tue Feb  3 09:00:34 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 3 Feb 2009 14:00:34 +0000
Subject: Date Comparison
In-Reply-To: <6uqvehFgpaciU1@mid.uni-berlin.de>
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<6uqvehFgpaciU1@mid.uni-berlin.de>
Message-ID: <8c7f10c60902030600qd6d0db3tb4e9f02914a8f093@mail.gmail.com>

2009/2/3 Diez B. Roggisch <deets at nospam.web.de>:
> Use the java API of java.util.

Or better still, use Joda.

-- 
Cheers,
Simon B.


From tino at wildenhain.de  Tue Feb  3 09:32:26 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 15:32:26 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <87y6wnfxoe.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>	<mailman.8689.1233667986.3487.python-list@python.org>
	<87y6wnfxoe.fsf@christopherculver.com>
Message-ID: <4988557A.5020407@wildenhain.de>

Christopher Culver wrote:
> Tino Wildenhain <tino at wildenhain.de> writes:
>> so instead you would use archive = zipfile.ZipFile(remotedata)
> 
> That produces the following error if I try that in the Python
> interpreter (URL edited for privacy):
> 
>>>> import zipfile
>>>> import urllib2
>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>> archive = zipfile.ZipFile(remotedata)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
>     self._GetContents()
>   File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
>     self._RealGetContents()
>   File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
>     endrec = _EndRecData(fp)
>   File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
>     fpin.seek(-22, 2)               # Assume no archive comment.
> AttributeError: addinfourl instance has no attribute 'seek'

Oh thats annoying. In this case short of providing a buffered
wrapper (which is possible) you would stick to the temp file
for an easy solution. Sorry about that.

Regards
Tino
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From jcd at sdf.lonestar.org  Tue Feb  3 09:54:16 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 03 Feb 2009 09:54:16 -0500
Subject: English-like Python
In-Reply-To: <497899D0.5030706@strout.net>
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org>
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>
	<497899D0.5030706@strout.net>
Message-ID: <1233672856.7189.7.camel@aalcdl07.lib.unc.edu>


On Thu, 2009-01-22 at 09:07 -0700, Joe Strout wrote:
> >>      Beep
> >>
> >> Doesn't get much more readable and syntax-free than that.
> > 
> > readable doesn't mean smallest amount of syntax possible sometimes
> syntax 
> > increases the readability of a text as you would see if we for
> example 
> > dropped all punctuation but you probably already knew that but
> perhaps 
> > you didnt draw the connection with programming language wink
> 
> Cute.  But I stand by my contention that "Beep" is about the most 
> readable way imaginable to express the "make a beep sound now please" 
> command, and any additional punctuation (parentheses, semicolons,
> etc.) 
> only get in the way.
> 

But what if your language allows functions to be used as first class
objects?  (Mine does :))  

x = Beep

Does that assign the name x to the Beep object or does it assign the
result of a Beep call to x?

There's no virtue in making ridiculously simple things even simpler if
it makes the interesting things impossible.

def tone_sequence(sound):
    sequence = DialTone.followed_by(sound)
    sequence()

for x in Beep, Buzz, Warble:
    tone_sequence(x)

Cheers,
Cliff




From nick at craig-wood.com  Tue Feb  3 10:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 03 Feb 2009 09:32:00 -0600
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
Message-ID: <slrngogniq.muq.nick@irishsea.home.craig-wood.com>

flagg <ianand0204 at gmail.com> wrote:
>  This xmlrpc server is designed to parse dns zone files and then
>  perform various actions on said files. \
>  It uses dnspython, and xmlrpclib
>   I'd like to know what some of the more experienced python users
>  think. Where I could improve code, make it more efficient, whatever.
>  All suggestions are welcome.  This is my first functional python
>  program,  and I have tons of questions to go along with whatever
>  suggestions.   How could I do sanity checking; right now nothing
>  checks the input to these functions, error-handling in this program is
>  almost non-existant how do you integrate decent error handling into a
>  piece of software......ill shut up now.

I made a few comments, some about error handling!  See below

>  import dns.zone
>  from time import localtime, strftime, time
>  import os, sys
>  from dns.rdataclass import *
>  from dns.rdatatype import *
>  from string import Template
>  import xmlrpclib
>  from SimpleXMLRPCServer import SimpleXMLRPCServer
>  from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
> 
> 
>  zoneDir = "/dns"
> 
>  def openZoneFile(zoneFile):
>      """
>      Opens a zone file.  Then reads in zone file to dnspython zone
>  object.
>      """
>      global zone
>      global host
>      global domain
>      domain = ".".join(zoneFile.split('.')[1:])
>      host = ".".join(zoneFile.split('.')[:1])
> 
>      try:
>              zone = dns.zone.from_file(zoneDir + domain + '.zone',
>  domain)
>      except dns.exception, e:
>              print e.__class__, e

Don't use global variables!

This function should probably return 3 things

    return zone, host, domain

And whenever you use it, say

    zone, host, domain = openZoneFile(xxx)

It should probably be a method of DNSFunctions.  I'd avoid setting
self.zone etc as that is making a different sort of global data which
I'd avoid too.

Also if the dns.zone.from_file didn't work (raises dns.exception) you
set the host and domain but the zone is left at its previous value
which probably isn't what you wanted.  I'd let the error propagate
which I think will do something sensible for the xmlrpc.

>  class DNSFunctions:
> 
>       # Not exposed to xml-rpc calls, used internally only.
>      def _writeToZoneFile(self, record):
>          """
>          Checks if zone file exists, if it does it write values to zone
>  file
>          """
> 
>          for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
>              new_serial = int(strftime('%Y%m%d00', localtime(time())))
>              if new_serial <= rdata.serial:
>                  new_serial = rdata.serial + 1
>              rdata.serial = new_serial
> 
>          if os.path.exists(zoneDir + str(zone.origin) + "zone"):
>              f = open(zoneDir + str(zone.origin) + "zone", "w")
>              zone.to_file(f)
>              f.close()
>          else:
>              print "Zone: " + zone.origin + " does not exist, please
>  add first"

This should probably be raising an exception to be caught or
propagated back to the client via xmlrpc.

> 
>      def showRecord(self, record):
>          """
>          Shows a record for a given zone. Prints out
>          TTL, IN, Record Type, IP
>          """
> 
>          openZoneFile(record)
> 
>          try:
>              rdataset = zone.get_node(host)
>              for rdata in rdataset:
>                  return str(rdata)
>          except:
>              raise Exception("Record not found")
> 
> 
>      def changeRecord(self, record, type, target):
>          """
>          Changes a dns entry.
>          @param record: which record to chance
>          @param type:  what type of record, A, MX, NS, CNAME
>          @target: if CNAME target points to HOSTNAME, if A record
>  points to IP
>          """
>          openZoneFile(record)
>          try:
>              rdataset = zone.find_rdataset(host, rdtype=type)
>          except:
>              raise Exception("You must enter a valid record and type.
>  See --usage for examples")

Don't catch all exceptions - find out which exceptions are thrown.
Consider just letting it propagate - hopefully the find_rdataset error
is descriptive enough.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jldunn2000 at googlemail.com  Tue Feb  3 10:38:38 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 3 Feb 2009 07:38:38 -0800 (PST)
Subject: Python ssh with SSH Tectia server
Message-ID: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>

Has anyone any experiencing with ssh between a python client and the
SSH Tectia server  from SSH (ssh.com) ?

Does it work?





From tino at wildenhain.de  Tue Feb  3 10:45:13 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 16:45:13 +0100
Subject: Python ssh with SSH Tectia server
In-Reply-To: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>
References: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>
Message-ID: <49886689.6050409@wildenhain.de>

Hi,

loial wrote:
> Has anyone any experiencing with ssh between a python client and the
> SSH Tectia server  from SSH (ssh.com) ?

this might well be. ;)
> 
> Does it work?

Did you try? (It should however since at least openssh client worked)

Cheers
Tino
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From gagsl-py2 at yahoo.com.ar  Tue Feb  3 10:45:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 13:45:27 -0200
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
Message-ID: <op.uor8p1dfx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor  
<btaylordesign at gmail.com> escribi?:

> I'm having an issue specifying the path for extracting files from
> a .zip archive. In my method, I have:
>
> zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> What is happening is that the extract method is creating a folder with
> the name of 'zip_name' and extracting the files to it. Example:

extract will create all directories in member name. Use open instead:

with zip_file.open(zip_name + '/' + thumbnail_image) as source:
   with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
     shutil.copyfileobj(source, target)

(untested)

-- 
Gabriel Genellina



From deets at nospam.web.de  Tue Feb  3 10:48:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 16:48:53 +0100
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<6uqvehFgpaciU1@mid.uni-berlin.de>
	<mailman.8691.1233669636.3487.python-list@python.org>
Message-ID: <6ur7b5Fgq8s0U1@mid.uni-berlin.de>

Simon Brunning wrote:

> 2009/2/3 Diez B. Roggisch <deets at nospam.web.de>:
>> Use the java API of java.util.
> 
> Or better still, use Joda.
> 

"dates compare you must?"

SCNR. Didn't know of this incarnation of him...

Diez


From erobererunc at gmail.com  Tue Feb  3 10:58:49 2009
From: erobererunc at gmail.com (er)
Date: Tue, 3 Feb 2009 10:58:49 -0500
Subject: Python Global State
Message-ID: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>

Simple question, I think: Is there a way to make a completely global
variable across a slew of modules?  If not, what is the canonical way to
keep a global state?  The purpose of this is to try to prevent circular
module imports, which just sort of seems nasty.  Thank you!
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From google at mrabarnett.plus.com  Tue Feb  3 11:00:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 16:00:40 +0000
Subject: parse date/time from a log entry with only strftime (and no
	regexen)
In-Reply-To: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
Message-ID: <49886A28.2080204@mrabarnett.plus.com>

Simon Mullis wrote:
 > Hi All
 >
 > I'm writing a script to help with analyzing log files timestamps and
 > have a very specific question on which I'm momentarily stumped....
 >
 > I'd like the script to support multiple log file types, so allow a
 > strftime format to be passed in as a cli switch (default is %Y-%m-%d
 > %H:%M:%S).
 >
 > When it comes to actually doing the analysis I want to store or discard
 > the log entry based on certain criteria. In fact, I only need the log
 > line timestamp.
 >
 > I'd like to do this in one step and therefore not require the user to
 > supply a regex aswell as a strftime format:
 >
 >  >>> import datetime
 >  >>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
 > remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
 > Traceback (most recent call last):
 >   File "<stdin>", line 1, in <module>
 >   File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
 >     data_string[found.end():])
 > ValueError: unconverted data remains:  this is the remainder of the log
 > line that I do not care about
 >
 >  >>> repr(p)
 > NameError: name 'p' is not defined
 >
 > Clearly the strptime method above can grab the right bits of data but
 > the string "p" is not created due to the error.
 >
 > So, my options are:
 >
 > 1 - Only support one log format.
 >
 > 2 - Support any log format but require a regex as well as a strftime
 > format so I can extract the "timestamp" portion.
 >
 > 3 - Create another class/method with a lookup table for the strftime
 > options that automagically creates the correct regex to extract the
 > right string from the log entry... (or is this overly complicated)
 >
 > 4 - Override the method above (strptime) to allow what I'm trying to do).
 >
 > 4 - Some other very clever and elegant solution that I would not ever
 > manage to think of myself....
 >
 >
 > Am I making any sense whatsoever?
 >
 > Thanks
 >
 > SM
 >
 > (P.S The reason I don't want the end user to supply a regex for the
 > timestamin he log-entry is that we're already using 2 other regexes as
 > cli switches to select the file glob and log line to match....)
 >
If the timestamp is always at the start of the line (and I expect it is)
and is always the same length then you could calculate how long the
timestamp is from the format (eg "%Y" matches 4 characters) and use
string slicing.

If the timestamp isn't a fixed length then a generating a regex might be
needed.


From ianand0204 at gmail.com  Tue Feb  3 11:03:01 2009
From: ianand0204 at gmail.com (flagg)
Date: Tue, 3 Feb 2009 08:03:01 -0800 (PST)
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
	<slrngogniq.muq.nick@irishsea.home.craig-wood.com>
Message-ID: <106ff6e6-1c23-4adb-8d89-b59d852db458@q30g2000prq.googlegroups.com>

On Feb 3, 7:32?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> flagg <ianand0... at gmail.com> wrote:
> > ?This xmlrpc server is designed to parse dns zone files and then
> > ?perform various actions on said files. \
> > ?It uses dnspython, and xmlrpclib
> > ? I'd like to know what some of the more experienced python users
> > ?think. Where I could improve code, make it more efficient, whatever.
> > ?All suggestions are welcome. ?This is my first functional python
> > ?program, ?and I have tons of questions to go along with whatever
> > ?suggestions. ? How could I do sanity checking; right now nothing
> > ?checks the input to these functions, error-handling in this program is
> > ?almost non-existant how do you integrate decent error handling into a
> > ?piece of software......ill shut up now.
>
> I made a few comments, some about error handling! ?See below
>
>
>
> > ?import dns.zone
> > ?from time import localtime, strftime, time
> > ?import os, sys
> > ?from dns.rdataclass import *
> > ?from dns.rdatatype import *
> > ?from string import Template
> > ?import xmlrpclib
> > ?from SimpleXMLRPCServer import SimpleXMLRPCServer
> > ?from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
>
> > ?zoneDir = "/dns"
>
> > ?def openZoneFile(zoneFile):
> > ? ? ?"""
> > ? ? ?Opens a zone file. ?Then reads in zone file to dnspython zone
> > ?object.
> > ? ? ?"""
> > ? ? ?global zone
> > ? ? ?global host
> > ? ? ?global domain
> > ? ? ?domain = ".".join(zoneFile.split('.')[1:])
> > ? ? ?host = ".".join(zoneFile.split('.')[:1])
>
> > ? ? ?try:
> > ? ? ? ? ? ? ?zone = dns.zone.from_file(zoneDir + domain + '.zone',
> > ?domain)
> > ? ? ?except dns.exception, e:
> > ? ? ? ? ? ? ?print e.__class__, e
>
> Don't use global variables!
>
> This function should probably return 3 things
>
> ? ? return zone, host, domain
>
> And whenever you use it, say
>
> ? ? zone, host, domain = openZoneFile(xxx)
>
> It should probably be a method of DNSFunctions. ?I'd avoid setting
> self.zone etc as that is making a different sort of global data which
> I'd avoid too.
>
> Also if the dns.zone.from_file didn't work (raises dns.exception) you
> set the host and domain but the zone is left at its previous value
> which probably isn't what you wanted. ?I'd let the error propagate
> which I think will do something sensible for the xmlrpc.
>
>
>
> > ?class DNSFunctions:
>
> > ? ? ? # Not exposed to xml-rpc calls, used internally only.
> > ? ? ?def _writeToZoneFile(self, record):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Checks if zone file exists, if it does it write values to zone
> > ?file
> > ? ? ? ? ?"""
>
> > ? ? ? ? ?for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
> > ? ? ? ? ? ? ?new_serial = int(strftime('%Y%m%d00', localtime(time())))
> > ? ? ? ? ? ? ?if new_serial <= rdata.serial:
> > ? ? ? ? ? ? ? ? ?new_serial = rdata.serial + 1
> > ? ? ? ? ? ? ?rdata.serial = new_serial
>
> > ? ? ? ? ?if os.path.exists(zoneDir + str(zone.origin) + "zone"):
> > ? ? ? ? ? ? ?f = open(zoneDir + str(zone.origin) + "zone", "w")
> > ? ? ? ? ? ? ?zone.to_file(f)
> > ? ? ? ? ? ? ?f.close()
> > ? ? ? ? ?else:
> > ? ? ? ? ? ? ?print "Zone: " + zone.origin + " does not exist, please
> > ?add first"
>
> This should probably be raising an exception to be caught or
> propagated back to the client via xmlrpc.
>
>
>
>
>
> > ? ? ?def showRecord(self, record):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Shows a record for a given zone. Prints out
> > ? ? ? ? ?TTL, IN, Record Type, IP
> > ? ? ? ? ?"""
>
> > ? ? ? ? ?openZoneFile(record)
>
> > ? ? ? ? ?try:
> > ? ? ? ? ? ? ?rdataset = zone.get_node(host)
> > ? ? ? ? ? ? ?for rdata in rdataset:
> > ? ? ? ? ? ? ? ? ?return str(rdata)
> > ? ? ? ? ?except:
> > ? ? ? ? ? ? ?raise Exception("Record not found")
>
> > ? ? ?def changeRecord(self, record, type, target):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Changes a dns entry.
> > ? ? ? ? ?@param record: which record to chance
> > ? ? ? ? ?@param type: ?what type of record, A, MX, NS, CNAME
> > ? ? ? ? ?@target: if CNAME target points to HOSTNAME, if A record
> > ?points to IP
> > ? ? ? ? ?"""
> > ? ? ? ? ?openZoneFile(record)
> > ? ? ? ? ?try:
> > ? ? ? ? ? ? ?rdataset = zone.find_rdataset(host, rdtype=type)
> > ? ? ? ? ?except:
> > ? ? ? ? ? ? ?raise Exception("You must enter a valid record and type.
> > ?See --usage for examples")
>
> Don't catch all exceptions - find out which exceptions are thrown.
> Consider just letting it propagate - hopefully the find_rdataset error
> is descriptive enough.
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Thanks for taking the time to reply I appreciate it.  Are global
variables "bad"?  Or just inefficient?

Also when you say:

"Also if the dns.zone.from_file didn't work (raises dns.exception) you
set the host and domain but the zone is left at its previous value
which probably isn't what you wanted.  I'd let the error propagate
which I think will do something sensible for the xmlrpc."

Could you elaborate on that.  Im not following what you mean by
"propagate"

Thanks again for the suggestions I'll remove the global variables and
use the method you described for assigning "host,domain and zone"


From Scott.Daniels at Acm.Org  Tue Feb  3 11:05:20 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 08:05:20 -0800
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <87y6wnfxoe.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>
	<mailman.8689.1233667986.3487.python-list@python.org>
	<87y6wnfxoe.fsf@christopherculver.com>
Message-ID: <beudnSi5b-lM9xXUnZ2dnUVZ_qadnZ2d@pdx.net>

Christopher Culver wrote:
> Tino Wildenhain <tino at wildenhain.de> writes:
>> so instead you would use archive = zipfile.ZipFile(remotedata)
> That produces the following error if I try that in the Python
> interpreter (URL edited for privacy): ....
>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>> archive = zipfile.ZipFile(remotedata)

No, he means you need to pull down the remote data.  Zip  file reading
is not done in a single pass; it needs to seek to find the directory,
then again to get to the data for any particular file.  Seeking around
a file does not work so well across the net.

Try something like:
     >>> import zipfile
     >>> import urllib2
     >>> import StringIO # or cStringIO as StringIO
     >>> remotehandle = urllib2.urlopen("http://...file.zip")
     >>> zipdata = StringIO.StringIO(remotehandle.read())
     >>> remotehandle.close()
     >>> archive = zipfile.ZipFile(zipdata)
or:
     >>> with urllib2.urlopen("http://...file.zip") as remotehandle:
     ...    zipdata = StringIO.StringIO(remotehandle.read())
     ...    archive = zipfile.ZipFile(zipdata)

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Tue Feb  3 11:10:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 16:10:32 +0000
Subject: Python Global State
In-Reply-To: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <49886C78.5020406@mrabarnett.plus.com>

er wrote:
> Simple question, I think: Is there a way to make a completely global
> variable across a slew of modules?  If not, what is the canonical
> way to keep a global state?  The purpose of this is to try to prevent
> circular module imports, which just sort of seems nasty.  Thank you!
> 
Simple answer: no.

You can put your global state into a module which is imported wherever 
it's needed:

my_globals.py
-------------
foo = ""


module_1.py
-----------
import my_globals
...
my_globals.foo = "FOO"
...


module_2.py
-----------
import my_globals
...
print my_globals.foo
...



From mdw at distorted.org.uk  Tue Feb  3 11:10:59 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 16:10:59 +0000
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <87hc3bmrfw.fsf.mdw@metalzone.distorted.org.uk>

mohana2004 at gmail.com writes:

> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.
>
> example
> from datetime import date
> a=datetime.date(2009,2,1)
> b=datetime.date(2008,10,10)
> c= a-b
> c.days
> 114

I don't understand your problem.

        Jython 2.2.1 on java1.6.0_0
        Type "copyright", "credits" or "license" for more information.
        >>> from datetime import date
        >>> a=datetime.date(2009,2,1)
        >>> b=datetime.date(2008,10,10)
        >>> c = a - b
        >>> c.days
        114

-- [mdw]


From gherron at islandtraining.com  Tue Feb  3 11:11:17 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 03 Feb 2009 08:11:17 -0800
Subject: Python Global State
In-Reply-To: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <49886CA5.9090605@islandtraining.com>

er wrote:
> Simple question, I think: Is there a way to make a completely global
> variable across a slew of modules?  

No.

> If not, what is the canonical way to keep a global state?  


But this might satisfy:

Create a module called, perhaps, global.py which contains your variables.

global.py
  VarA = None
  VarB = None

Then any module can import it and read/write the values.

  import global
  global.VarA = ...
  print global.VarB
  # and so forth



> The purpose of this is to try to prevent circular module imports,
> which just sort of seems nasty.  Thank you!

I'm not sure how that will work.


Gary Herron





From Scott.Daniels at Acm.Org  Tue Feb  3 11:12:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 08:12:29 -0800
Subject: is python Object oriented??
In-Reply-To: <mailman.8682.1233648428.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de>
	<mailman.8682.1233648428.3487.python-list@python.org>
Message-ID: <Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>

Hendrik van Rooyen wrote:
> "Diez B. Roggisch" <deets at nospam.web.de>
>> ...Sure one could envision a system where each object is running in it's
>> micro-process.
> ...  I would have loved a
> language that supported it, as well as an operating system 
> (and I do not mean stuff like tiny os and others of that ilk), 
> but one that really supported fast task switching to make 
> the micro tasks less expensive on cheap little processors 
> with scarce resources....

You might enjoy looking at QNX, since I think it is built along the
lines you are describing here.  I have an ancient copy of their OS,
but haven't followed for more than couple of decades.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Tue Feb  3 11:17:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 11:17:17 -0500
Subject: MySQLdb and MySQL stored functions
In-Reply-To: <0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
	<0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
Message-ID: <gm9qmf$den$1@ger.gmane.org>

kurt.forrester.fec at googlemail.com wrote:
> On Feb 3, 8:28 am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>> On Mon, 2 Feb 2009 23:28:05 -0800 (PST),
>> kurt.forrester.... at googlemail.com declaimed the following in
>> comp.lang.python:
>>
>>> However, when I try to use the MySQLdb module it returns an incorrect
>>> value (it returns 1).
>>> I wish to use the DB API 2.0 compliant module for flexibility.
>>> Therefore I am trying to work out why the MySQLdb does not return the
>>> value as expected (that is as it is returned by the Query Browser).
>>> Any help would be greatly appreciated.
>>         Show the code!
>>
>>         At a rough guess, given the lack of details...
>>
>>         You forgot to .fetch() the result and are looking at the status code
>> from the .execute()
>> --
>>         Wulfraed        Dennis Lee Bieber               KD6MOG
>>         wlfr... at ix.netcom.com              wulfr... at bestiaria.com
>>                 HTTP://wlfraed.home.netcom.com/
>>         (Bestiaria Support Staff:               web-a... at bestiaria.com)
>>                 HTTP://www.bestiaria.com/
> 
> Correct diagnosis.
> 
> Thanks.
> 
> Any ideas on how to suppress the warning output:
> __main__:1: Warning: No data - zero rows fetched, selected, or
> processed
> --
try:
    ...
except MySQLdb.Warning:
    pass

There is probably some setting you can establish with MySQL so it
doesn't raise these warnings: I have never seen one, and zero rows is a
perfectly valid retrieval result.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From exarkun at divmod.com  Tue Feb  3 11:23:43 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 3 Feb 2009 11:23:43 -0500
Subject: persistent TCP connection in python using socketserver
In-Reply-To: <80bc0bfa-f505-49f9-8d5a-f6574e6f8608@z28g2000prd.googlegroups.com>
Message-ID: <20090203162343.12853.1844552571.divmod.quotient.2903@henry.divmod.com>

On Sat, 31 Jan 2009 09:31:52 -0800 (PST), markobrien85 at gmail.com wrote:
> [snip]
>
>Cheers mate I had a look into twisted but was put off by the FAQ
>stating 1.0+ modules may or may not be stable, and only the 'core' is.
>I don't wanna be messing around with a potentially buggy server, so im
>gonna roll my own using the sockets module.
>

For what it's worth, that FAQ entry was grossly out of date.  I just
deleted it and replaced it with an entry which says the exact opposite.

Jean-Paul


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 11:48:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 14:48:28 -0200
Subject: parse date/time from a log entry with only strftime (and no
	regexen)
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
Message-ID: <op.uosbm2tsx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 11:52:07 -0200, Simon Mullis <simon at mullis.co.uk>  
escribi?:

> I'm writing a script to help with analyzing log files timestamps and  
> have a
> very specific question on which I'm momentarily stumped....
>
> I'd like the script to support multiple log file types, so allow a  
> strftime
> format to be passed in as a cli switch (default is %Y-%m-%d %H:%M:%S).

>>>> import datetime
>>>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
> remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
>     data_string[found.end():])
> ValueError: unconverted data remains:  this is the remainder of the log  
> line
> that I do not care about

If the logfile has fixed width fields, you may ask the user a column range  
to extract the date/time information.

-- 
Gabriel Genellina



From gdamjan at gmail.com  Tue Feb  3 11:51:06 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Tue, 03 Feb 2009 17:51:06 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<mailman.8580.1233563045.3487.python-list@python.org>
Message-ID: <r89m56-sit.ln1@archaeopteryx.softver.org.mk>

> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a
> whole system without hiding a single item.

I guess the problem is that you would not be able to use some libraries 
because their author thought that it would be wise to hide everything (a 
behavior fairly popular in the Java world).

Let take some http library as an example, the author would certainly 
think that hiding the socket object is the only sane thing to do.
But what if you just *have* to call that special ioctl on the socket 
object before it can work in your scenario...

In python you can easily go under the hood if you need to do it.



-- 
?????? ( http://softver.org.mk/damjan/ )

"We think it's a great consumer win, and it's a great industry win, 
to be able to ensure that with good copy protection, 
you can have so much functionality for the user", 
Jordi Rivas, Microsoft Director of Technology



From djames.suhanko at gmail.com  Tue Feb  3 11:58:27 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Tue, 3 Feb 2009 14:58:27 -0200
Subject: Window (tkinter) with no decoration
Message-ID: <fd9e6bba0902030858u32f35095tad0b8024f4394017@mail.gmail.com>

Hello, programmers!
 I would like to do a menu bar like kicker or windows menu. is possible?


-- 
Djames Suhanko
LinuxUser 158.760


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 11:59:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 14:59:07 -0200
Subject: Problem using compileall
References: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>
Message-ID: <op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 05:53:06 -0200, Stephen Hansen <apt.shansen at gmail.com>  
escribi?:

> I'm having a slight problem with pre-compiling some files for  
> distribution
> that I'm not sure where to even look for.
>
> An excerpt from an output:
>
>     C:\mother\Python24\core\application\sysconfig>python -m compileall .
>     Listing . ...
>     Compiling .\BulkListClass.py ...
>     Sorry: TypeError: ('compile() expected string without null bytes',)
>     Compiling .\BulkUserImporter.py ...
>
> The BulkListClass is then not creating a PYC.

Try this to discover whether the file actually contains a NUL byte or not:

f = open("BulkListClass.py","rb")
src = f.read()
i = src.index('\0')
print "found NUL at index", i
print repr(src[i-20:i+20])


-- 
Gabriel Genellina



From aahz at pythoncraft.com  Tue Feb  3 12:02:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 Feb 2009 09:02:18 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
Message-ID: <gm9taq$63d$1@panix3.panix.com>

In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>* Aahz (2 Feb 2009 09:29:43 -0800)
>> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>>* Aahz (2 Feb 2009 06:30:00 -0800)
>>>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>>>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>>>aahz at pythoncraft.com (Aahz) writes:
>>>>>>
>>>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>>>
>>>>>On what basis?
>>>> 
>>>> It makes my eyes bleed
>>>
>>>Ever tried sunglasses?
>> 
>> Polarized sunglasses don't work too well with LCD monitors
>
>Well, the answer to your issue with syntax highlighting is to use a 
>/decent/ highlighting colour scheme. Don't use that all 
>purple/red/green/yellow/blue one. That's for psychedelic trips.
>
>Use a decent colour scheme for adults and you will see that you will 
>benefit from syntax highlighting.

Then I have the problem of copying around the syntax highlighting
configuration to every computer I use.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From apt.shansen at gmail.com  Tue Feb  3 12:12:53 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 09:12:53 -0800
Subject: Problem using compileall
In-Reply-To: <op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>
References: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>
	<op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <7a9c25c20902030912x15397ae6k97da3d5d661f152c@mail.gmail.com>

> Try this to discover whether the file actually contains a NUL byte or not:
>
> f = open("BulkListClass.py","rb")
> src = f.read()
> i = src.index('\0')
> print "found NUL at index", i
> print repr(src[i-20:i+20])

Doh. It did. How the heck did that get there! I hadn't thought to
actually look -- which seems terribly dense in retrospect -- because I
just assumed whatever regular-Python did to compile the same file,
compileall'd duplicate. Doh. :)

Thanks.

--S


From joncle at googlemail.com  Tue Feb  3 12:14:14 2009
From: joncle at googlemail.com (Jon Clements)
Date: Tue, 3 Feb 2009 09:14:14 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com> 
	<598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com> 
	<aqhfo4lndptd28f21f2lgoppap5mgcgpca@4ax.com>
Message-ID: <7e91345b-1fed-442c-8c4a-aa4f7b580df4@b38g2000prf.googlegroups.com>

On 3 Feb, 04:27, Tim Roberts <t... at probo.com> wrote:
> vsoler <vicente.so... at gmail.com> wrote:
>
> >I'm still interested in learning python techniques. Are there any
> >other modules (standard or complementary) that I can use in my
> >education?
>
> Are you serious about this? ?Are you not aware that virtually ALL of the
> Python standard modules are written in Python, and are included in their
> full, readable source form in every Python installation? ?\Python25\lib in
> Windows, /usr/lib/python25 in Linux.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

Okies, so the sniffer is there as readable python, but the most
interesting bit (which fair enough I made the assumption the OP was
interested in) is the reader/writer functionality -- which is
implemented as a shared library and thus, unless you have a source
install of python somewhere, there is no readable code.

Jon.


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 12:16:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 15:16:30 -0200
Subject: Where & how to deallocate resources in Python C extension
References: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>
Message-ID: <op.uoscxso1x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 21:03:18 -0200, <fredbasset1000 at gmail.com> escribi?:

> I've written a C extension, see code below, to provide a Python
> interface to a hardware watchdog timer.  As part of the initialization
> it makes some calls to mmap, I am wondering should I be making
> balanced calls to munmap in some kind of de-init function?  Do Python
> extensions have d'tors?

No, there is no way to de-initialize an extension module. That's a big  
deficiency.
In some cases you may provide your own function (and hope the users call  
it when needed), or use Py_AtExit.

-- 
Gabriel Genellina



From antoniosacchi85 at gmail.com  Tue Feb  3 12:22:12 2009
From: antoniosacchi85 at gmail.com (antoniosacchi85 at gmail.com)
Date: Tue, 3 Feb 2009 09:22:12 -0800 (PST)
Subject: Find the critical points
Message-ID: <1b1b6f12-c910-4a13-902d-3523bfe8e3f5@u18g2000pro.googlegroups.com>

someone can help me??
I am new to programing,
but I need to make some script like this:
http://blogs.nyu.edu/blogs/agc282/zia/2008/11/using_python_to_solve_optimiza.html
so th equestion is :
is possible to open it than it ask something and it tell me the
result??
thank you!!
p.s.
this is my hessiana.py:

import sympy as S
x,y=S.symbols('xy')
f=x**4+x**2-6*x*y+3*y**2
a=S.diff(f,x)
S.pprint(a)
b=S.diff(f,y)
S.pprint(b)
S.solve_system([a,b],[x,y])
H=S.hessian(f,[x,y])
M1=S.Matrix([14,-6],[-6,6])
M2=S.Matrix([2,-6],[-6,6])
S.Matrix.berkowitz_minors(M2)
S.Matrix.berkowitz_minors(M1)


From Scott.Daniels at Acm.Org  Tue Feb  3 12:25:27 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 09:25:27 -0800
Subject: Python Global State
In-Reply-To: <mailman.8699.1233677484.3487.python-list@python.org>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<mailman.8699.1233677484.3487.python-list@python.org>
Message-ID: <1uGdnW8nBLsK4BXUnZ2dnUVZ_ovinZ2d@pdx.net>

Gary Herron wrote:
> er wrote:
>> Simple question, I think: Is there a way to make a completely global
>> variable across a slew of modules?  
> 
...
> 
> Create a module called, perhaps, global.py which contains your variables.
Bad choice of names (a reserved word).  Use globals, or data or global_.
Otherwise, the advice is spot-on.

--Scott David Daniels
Scott.Daniels at Acm.Org


From no at spam.thanks  Tue Feb  3 12:31:21 2009
From: no at spam.thanks (Keith)
Date: Tue, 3 Feb 2009 17:31:21 +0000 (UTC)
Subject: Safe to get address of va_list function parameter?
References: <YSWhl.1000$eK2.715@nwrddc01.gnilink.net>
Message-ID: <ln64jrxplr.fsf@nuthaus.mib.org>

Is it safe to get the address of a va_list function parameter?

Keith


From robin at reportlab.com  Tue Feb  3 12:36:05 2009
From: robin at reportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 17:36:05 +0000
Subject: x64 speed
Message-ID: <49888085.3020709@chamonix.reportlab.co.uk>

Whilst doing some portability testing with reportlab I noticed a strange speedup 
for our unittest suite with python2.5

host  win32 xp3 unittest time=42.2 seconds
vmware RHEL x64 unittest time=30.9 seconds

so it looks like the vmware emulated system is much faster. Is it the x64 
working faster at its design sizes or perhaps the compiler or could it be the 
vmware system caching all writes etc etc? For the red hat x64 build the only 
special configuration was to use ucs2

I know that the VT bit stuff has made virtualization much better, but this seems 
a bit weird.
-- 
Robin Becker



From thmpsn.m.k at gmail.com  Tue Feb  3 12:36:54 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Tue, 3 Feb 2009 09:36:54 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
Message-ID: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>

On Feb 3, 1:14?am, David Cournapeau <courn... at gmail.com> wrote:
> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> > Here we go again. If you have access to the source code (as you nearly
> >> > always do with Python code), then "breaking the language-enforced data
> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> > equivalent).
>
> >> If it's that trivial to defeat something that its proponents appear to
> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> of using "private" in the first place?
>
> >> --
> >> Rhodri James *-* Wildebeeste Herder to the Masses
>
> > If a library developer releases the source code of a library, any user
> > can trivially "defeat" the access restrictions. But if a team of
> > developers is checking in code for a project, the leader(s) of the
> > project can insist that the access restrictions be respected to
> > simplify the management of interfaces. The larger the team, the more
> > useful that can be. That's why Java, C++, Ada, Scala, and other
> > languages have a "private" keyword.
>
> I think a lof of this "discussion" is caused by different usages of
> private. My understanding is that you think private is missing in
> python because there is no clear different between a member which is
> published (part of the API) and one which is not (e.g. whose behavior
> may change between different revisions, even minor). I agree the
> underscore is not an ideal solution - it is certainly not followed by
> all python code out there (not even in python itself - see distutils
> for example).
>
> But I think you are overstating the advantage of private for that
> usage, at least for C++. In C++, if you have a public class in a
> header:
>
> class Foo {
> ? ? private:
> ? ? ? ? int f;
>
> };
>
> It means f is private (cannot be accessed outside Foo instances), but
> it is declared in the public header. Actually, when people means this
> kind of 'data-hiding', C++ does not bring anything to C itself - after
> all, we have used FILE* for years and I have no idea about the FILE
> structure.

Your lack of knowledge about it doesn't mean that it has somehow
magically "private" members. The only reason that most of us don't
know what a FILE is is that it's definition is implementation-defined
(i.e., every compiler may define it differently).

That doesn't have anything to do with private members. For example, on
my system, <stdio.h> defines FILE as:

struct _iobuf {
        char *_ptr;
        int   _cnt;
        char *_base;
        int   _flag;
        int   _file;
        int   _charbuf;
        int   _bufsiz;
        char *_tmpfname;
        };
typedef struct _iobuf FILE;

Given this information, nothing prevents me from writing things like:

FILE* fp = fopen("file.txt", "r");
if (!fp) { /* do something */ }

printf("fp->_cnt = %d\n", fp->cnt);
printf("fp->_flag = %d\n", fp->_flag);
printf("fp->_file = %d\n", fp->_file);

fp->_flag = 0x20; // OOPS!!

> Maybe I still lack experience, but I find neither _ prefixing nor
> private/public/protected a satisfaying way to make clear what is
> public API and what is not. In particular, if I have a python package
> which does not use _ at all, shall I assume everything is public ?

Pretty much, unless maybe the code documents what you're not supposed
to access:

class IOBuf:
    def __init__(self):
        self.ptr = ""  # <- this is private!
        self.cnt = 0  # <- this is private!
        self.base = ""  # <- this is private!
        self.flag = 0  # <- this is private!
        self.file = 0  # <- this is private!
        self.charbuf = 0  # <- this is private!
        self.bufsiz = 0  # <- this is private!
        self.tmpfname = ""  # <- this is private!

Nope, not a good idea either...




From tundra at tundraware.com  Tue Feb  3 12:48:35 2009
From: tundra at tundraware.com (Tim Daneliuk)
Date: Tue, 03 Feb 2009 11:48:35 -0600
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <ikcm56-lmq.ln1@ozzie.tundraware.com>

Robin Becker wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or could
> it be the vmware system caching all writes etc etc? For the red hat x64
> build the only special configuration was to use ucs2
> 
> I know that the VT bit stuff has made virtualization much better, but
> this seems a bit weird.

Which vmware product?

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/


From Bornstub at gmail.com  Tue Feb  3 12:51:36 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Tue, 3 Feb 2009 09:51:36 -0800 (PST)
Subject: How to call python from a foreign language thread (C++)
Message-ID: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>

Hi,

I am developing a program that use DirectShow to grab audio data from
media files. DirectShow use thread to pass audio data to the callback
function in my program, and I let that callback function call another
function in Python.

I use Boost.Python to wrapper my library, the callback function :

class PythonCallback {
private:
    object m_Function;
public:
    PythonCallback(object obj)
        : m_Function(obj)
    {}

    void operator() (double time, const AudioData &data) {
        // Call the callback function in python
        m_Function(time, data);
    }
};

Here comes the problem, a thread of DirectShow calls my
PythonCallback, namely, call the function in Python. Once it calls, my
program just crash. I found this should be threading problem. Then I
found this document:

http://docs.python.org/c-api/init.html

It seems that my program can't call to Python's function from thread
directly, because there is Global Interpreter Lock. The python's GIL
is so complex, I have no idea how it works. I'm sorry, what I can do
is to ask. My question is. What should I do before and after I call a
Python function from threads?

It may looks like this.

    void operator() (double time, const AudioData &data) {
        // acquire lock
        m_Function(time, data);
        // release lock
    }

Thanks.
Victor Lin.


From steve at holdenweb.com  Tue Feb  3 12:56:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 12:56:24 -0500
Subject: Bitwise 2009 ($5000 prize money)
In-Reply-To: <gm97i8$bm9$1@svr7.m-online.net>
References: <e3935f02-7353-457a-8b54-65d413edd314@l33g2000pri.googlegroups.com>
	<gm97i8$bm9$1@svr7.m-online.net>
Message-ID: <gma0gb$3gg$1@ger.gmane.org>

Christof Donat wrote:
> Hi,
> 
>> http://www.bitwise.iitkgp.ernet.in/
> 
> I'm having quite some fun reading the questions since I got this Post in 
> comp.lang.c++ before. Here it is of topic and this crosspostings will 
> definatelly not be a good advertisement for your contest.
> 
Thanks you so much, Christof. The spam filters successfully kept this
URL out of c.l.py until you took the trouble to re-publish it.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From f.guerrieri at gmail.com  Tue Feb  3 13:01:31 2009
From: f.guerrieri at gmail.com (Francesco Guerrieri)
Date: Tue, 3 Feb 2009 19:01:31 +0100
Subject: New filters? was: Re: Bitwise 2009 ($5000 prize money)
Message-ID: <79b79e730902031001r6180b531j57c2b1247ba1865c@mail.gmail.com>

On Tue, Feb 3, 2009 at 6:56 PM, Steve Holden <steve at holdenweb.com> wrote:

> Thanks you so much, Christof. The spam filters successfully kept this
> URL out of c.l.py until you took the trouble to re-publish it.
>
> regards
>  Steve
>

Speaking of which: it seems to me that the amount of spam that I receive
from clpy has greatly reduced in the last month or so.
So it seems that the spam filters are doing a great job.

Thanks are due to the people managing them :-)

Francesco
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From cournape at gmail.com  Tue Feb  3 13:05:27 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 03:05:27 +0900
Subject: is python Object oriented??
In-Reply-To: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
Message-ID: <5b8d13220902031005k538c1d12ufb8bede897f43a7c@mail.gmail.com>

On Wed, Feb 4, 2009 at 2:36 AM,  <thmpsn.m.k at gmail.com> wrote:
> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
>> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
>> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
>> >> > Here we go again. If you have access to the source code (as you nearly
>> >> > always do with Python code), then "breaking the language-enforced data
>> >> > hiding" is a trivial matter of deleting the word "private" (or
>> >> > equivalent).
>>
>> >> If it's that trivial to defeat something that its proponents appear to
>> >> want to be close to an iron-clad guarantee, what on earth is the point
>> >> of using "private" in the first place?
>>
>> >> --
>> >> Rhodri James *-* Wildebeeste Herder to the Masses
>>
>> > If a library developer releases the source code of a library, any user
>> > can trivially "defeat" the access restrictions. But if a team of
>> > developers is checking in code for a project, the leader(s) of the
>> > project can insist that the access restrictions be respected to
>> > simplify the management of interfaces. The larger the team, the more
>> > useful that can be. That's why Java, C++, Ada, Scala, and other
>> > languages have a "private" keyword.
>>
>> I think a lof of this "discussion" is caused by different usages of
>> private. My understanding is that you think private is missing in
>> python because there is no clear different between a member which is
>> published (part of the API) and one which is not (e.g. whose behavior
>> may change between different revisions, even minor). I agree the
>> underscore is not an ideal solution - it is certainly not followed by
>> all python code out there (not even in python itself - see distutils
>> for example).
>>
>> But I think you are overstating the advantage of private for that
>> usage, at least for C++. In C++, if you have a public class in a
>> header:
>>
>> class Foo {
>>     private:
>>         int f;
>>
>> };
>>
>> It means f is private (cannot be accessed outside Foo instances), but
>> it is declared in the public header. Actually, when people means this
>> kind of 'data-hiding', C++ does not bring anything to C itself - after
>> all, we have used FILE* for years and I have no idea about the FILE
>> structure.
>
> Your lack of knowledge about it doesn't mean that it has somehow
> magically "private" members. The only reason that most of us don't
> know what a FILE is is that it's definition is implementation-defined
> (i.e., every compiler may define it differently).
>
> That doesn't have anything to do with private members. For example, on
> my system, <stdio.h> defines FILE as:
>
> struct _iobuf {
>        char *_ptr;
>        int   _cnt;
>        char *_base;
>        int   _flag;
>        int   _file;
>        int   _charbuf;
>        int   _bufsiz;
>        char *_tmpfname;
>        };
> typedef struct _iobuf FILE;

Hm, I guess it depends on the implementation, but it is at least
possible in C to completely hide the structure, by declaring only a
pointer, and defining the structure outside any public header file.
Then, you cannot accidentally access any member - it would result in a
compiler error.

This method is also used in C++, that's the pimpl pattern. It is used
for various purposes (avoid long compilation times when changing some
private implementation, actual data hiding), but the underlying idea
is that you hide the implementation from the public headers. That's
used for example by QT, and many other C++ libraries.

This shows quite strongly the limitations of the whole private/public
business in C++.

>
> Pretty much, unless maybe the code documents what you're not supposed
> to access:

But that's my point: that's just not true for many packages I have
used - some packages do follow the _ convention, some don't. For
example, to take an example I am somewhat familiar with: distutils
does not follow this at all. There is no documentation, and it is
almost impossible to know what's the API from implementation details,
the interface is leaking everywhere. Now, distutils is an "old"
package, but my experience at least showed me that this is relatively
common.

There are some relatively well known packages which use a different
mechanism to clearly separate the intended API, without using the _
convention, or more exactly in supplement of it.

David


From cournape at gmail.com  Tue Feb  3 13:12:55 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 03:12:55 +0900
Subject: x64 speed
In-Reply-To: <49888085.3020709@chamonix.reportlab.co.uk>
References: <49888085.3020709@chamonix.reportlab.co.uk>
Message-ID: <5b8d13220902031012oeef1b9fga08573629a83e34b@mail.gmail.com>

On Wed, Feb 4, 2009 at 2:36 AM, Robin Becker <robin at reportlab.com> wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
>
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
>
> so it looks like the vmware emulated system is much faster. Is it the x64
> working faster at its design sizes or perhaps the compiler or could it be
> the vmware system caching all writes etc etc? For the red hat x64 build the
> only special configuration was to use ucs2
>
> I know that the VT bit stuff has made virtualization much better, but this
> seems a bit weird.

It can be many things of course depending on your configuration and
what you are doing in your unit tests, but I don't find it weird at
all. I often see faster results when IO is involed in my Ubuntu in
vmware fusion than on mac os X - again, can be that the vm is not
loaded (less python packages, faster import times), Linux better IO
handling (I don't know whether this is true or not, but I could at
least imagine that linux FS generally being faster than windows or mac
os X ones, this could influence IO)

It can also be compilers differences, 32 vs 64 bits as you say, etc...
If you want to be sure, you should try a window VM :)

David


From digitig at gmail.com  Tue Feb  3 13:14:58 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 3 Feb 2009 18:14:58 +0000
Subject: what IDE is the best to write python?
In-Reply-To: <8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<20090202034654.GD30237@turki.gavron.org>
	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
Message-ID: <aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>

2009/2/3 Jervis Whitley <jervisau at gmail.com>:

> real programmers use ed.

Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
our bare teeth...

-- 
Tim Rowe


From catherine.heathcote at gmail.com  Tue Feb  3 13:19:57 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Tue, 03 Feb 2009 18:19:57 GMT
Subject: what IDE is the best to write python?
In-Reply-To: <mailman.8712.1233684902.3487.python-list@python.org>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
Message-ID: <hV%hl.29854$Sp5.19680@text.news.virginmedia.com>

Tim Rowe wrote:
> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
> 
>> real programmers use ed.
> 
> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
> our bare teeth...
> 

You had teeth!?!

Oh and hi, I shall be a new face in the crowd ;)


From rdmurray at bitdance.com  Tue Feb  3 13:27:33 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 18:27:33 +0000 (UTC)
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com>
Message-ID: <gma2al$a5p$1@ger.gmane.org>

Quoth MRAB <google at mrabarnett.plus.com>:
> er wrote:
> > Simple question, I think: Is there a way to make a completely global
> > variable across a slew of modules?  If not, what is the canonical
> > way to keep a global state?  The purpose of this is to try to prevent
> > circular module imports, which just sort of seems nasty.  Thank you!
> > 
> Simple answer: no.

I'm wondering a little about posting this, but...well, the answer actually
isn't "no".  It's just that it's not something you should _ever_ do.
The trick is to assign the value to the __builtins__ module...

--RDM

PS: I know this because Zope used to do it.  Fortunately they wised
up and refactored that code to be more sane.



From kmcbrearty at yahoo.com  Tue Feb  3 13:30:45 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Tue, 3 Feb 2009 10:30:45 -0800 (PST)
Subject: JDBC in CPYTHON
Message-ID: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>

I was wondering if anyone was aware of a JDBC DBAPI module for
cpython.  I have looked at PYJDBC and was interested in avoiding using
that extra level of ICE.  I was thinking maybe someone would have back
ported zxJDBC from Jython.  Or used that as a starting point, to
create a module and had a C based wrapper for the driver.  This type
of activity was talked about back in 2004 on this forum, but I was
wondering if anyone had newer information.

Regards,
                kmcb


From rdmurray at bitdance.com  Tue Feb  3 13:38:41 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 18:38:41 +0000 (UTC)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
Message-ID: <gma2vg$ch6$1@ger.gmane.org>

Quoth aahz at pythoncraft.com (Aahz):
> In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >* Aahz (2 Feb 2009 09:29:43 -0800)
> >> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
> >> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >>>* Aahz (2 Feb 2009 06:30:00 -0800)
> >>>> In article <874ozd3cr3.fsf at benfinney.id.au>,
> >>>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >>>>>aahz at pythoncraft.com (Aahz) writes:
> >>>>>>
> >>>>>> Just to register a contrary opinion: I *hate* syntax highlighting
> >>>>>
> >>>>>On what basis?
> >>>> 
> >>>> It makes my eyes bleed
> >>>
> >>>Ever tried sunglasses?
> >> 
> >> Polarized sunglasses don't work too well with LCD monitors
> >
> >Well, the answer to your issue with syntax highlighting is to use a 
> >/decent/ highlighting colour scheme. Don't use that all 
> >purple/red/green/yellow/blue one. That's for psychedelic trips.
> >
> >Use a decent colour scheme for adults and you will see that you will 
> >benefit from syntax highlighting.
> 
> Then I have the problem of copying around the syntax highlighting
> configuration to every computer I use.

Well, _that's_ easy to fix.  I have a little bash script called
'synchome' that uses rsync to update the home directory on any
of the remote machines on which I work.  I've had to install
rsync on one or two of the boxes, but that's a useful thing to
do anyway.

(Granted, I still have a couple bugs to work out, where I haven't
taken the time to conditionalize things properly for some of
the more exotic machine configurations, but hey, if I spend
more time on those machines I'll get around to it...)

Now, if you are a Windows user, then I sympathise...a little  :)

--RDM



From philip at semanchuk.com  Tue Feb  3 13:44:07 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 3 Feb 2009 13:44:07 -0500
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
Message-ID: <FEA0A691-EFAE-4207-B561-539706A8339C@semanchuk.com>


On Feb 3, 2009, at 12:51 PM, Victor Lin wrote:

>
> It seems that my program can't call to Python's function from thread
> directly, because there is Global Interpreter Lock. The python's GIL
> is so complex, I have no idea how it works. I'm sorry, what I can do
> is to ask. My question is. What should I do before and after I call a
> Python function from threads?


Hi Victor,
I asked a similar question yesterday and have gotten no response yet  
-- I hope you'll have better luck. I'm writing a C extension that  
wants to implement a callback in a new thread. Here's what I think  
I've learned from reading the threads API doc. Please note that this  
is a classic case of the blind leading the blind! I'm sure some (most?  
all?) of the ideas below are wrong, but I'm hoping that thinking  
through some of this "out loud" will help both of us. Or maybe some  
more knowledgeable person will take pity on/be appalled by my  
ignorance and come to our rescue. =)

Python's infamous GIL doesn't exist when a program is single-threaded.  
Before a new thread is created, the main thread must call  
PyEval_InitThreads() to create the GIL. However, "It is not safe to  
call this function when it is unknown which thread (if any) currently  
has the global interpreter lock." Therefore my extension must do this:

i_have_the_gil = 0;
if (!PyEval_ThreadsInitialized()) {
    PyEval_InitThreads();
    /* "...when this function initializes the lock, it also acquires  
it." */
    i_have_the_gil = 1;
}

That ensures that the GIL is created.

My extension will be calling from a newly-created C thread. The  
*Python* thread doesn't exist yet; so next I have to create it.  
Therefore --

if (!i_have_the_gil)
    PyEval_AcquireLock();

// Might not actually be the main thread but conceptually
// it is OK to assume so here.
main_thread = PyThreadState_Get();

callback_thread = PyThreadState_New(main_thread->interp);

PyThreadState_Swap(callback_thread);

gstate = PyGILState_Ensure();

call_callback_function();

// Now unwind the above

PyGILState_Release(gstate);

PyThreadState_Swap(main_thread);

PyThreadState_Clear(callback_thread);

PyThreadState_Delete(callback_thread);

PyEval_ReleaseLock();


I haven't yet tested this! But hopefully it is the right idea and just  
needs a little fine tuning.

I found this discussion useful:
http://mail.python.org/pipermail/python-list/2006-November/413088.html

It includes the quote, "The current thread state API doc, as you read  
it from top to bottom now, is in fact totally confusing for anyone who  
didn't develop Python himself"

I like! =)

Cheers
Philip





From geert.discussions at gmail.com  Tue Feb  3 13:47:29 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Tue, 03 Feb 2009 19:47:29 +0100
Subject: Path question
Message-ID: <49889141.6000202@gmail.com>

Hi,

I have the following path construction:

./src/__init__.py
     /main.py
     /modules/__init__.py
             /application.py
     /ui/__init__.py
        /mainwindow/__init__.py
                   /mainwindow.py

Now I want to call the method 'MainWindow' in the module 'mainwindow', 
from the module 'application'.

I'm having the following import statement in 'applications.py':

from .. ui.mainwindow.mainwindow import MainWindow

That doesn't work.  I've also tried many other combinations like from 
..ui.mainwindow...  but none of them work.

I always get the following error:

"Attempted relative import beyond toplevel package"

How can I import the method 'MainWindow' from 'mainwindow' into 
'application', using the explicit relative import rules?

Or is there a better way to do this?
  
-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From erobererunc at gmail.com  Tue Feb  3 14:10:18 2009
From: erobererunc at gmail.com (er)
Date: Tue, 3 Feb 2009 14:10:18 -0500
Subject: Python Global State
In-Reply-To: <gma2al$a5p$1@ger.gmane.org>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com> <gma2al$a5p$1@ger.gmane.org>
Message-ID: <775033410902031110m2437f858n4affa3a0a92dd90a@mail.gmail.com>

That was my hack for one other app, but I did it because I'd only been
studying Python for a month or two.  Glad to see others did it once as well,
but that we all wised up.  =P

It might be nice if Python could provide a global dictionary, perhaps _G{},
where you can throw things.  This is actually the solution provided by the
Lua scripting language.  Thanks for the global_ module solution, I was just
making sure that was the canonical way.

On Tue, Feb 3, 2009 at 1:27 PM, <rdmurray at bitdance.com> wrote:

> Quoth MRAB <google at mrabarnett.plus.com>:
> > er wrote:
> > > Simple question, I think: Is there a way to make a completely global
> > > variable across a slew of modules?  If not, what is the canonical
> > > way to keep a global state?  The purpose of this is to try to prevent
> > > circular module imports, which just sort of seems nasty.  Thank you!
> > >
> > Simple answer: no.
>
> I'm wondering a little about posting this, but...well, the answer actually
> isn't "no".  It's just that it's not something you should _ever_ do.
> The trick is to assign the value to the __builtins__ module...
>
> --RDM
>
> PS: I know this because Zope used to do it.  Fortunately they wised
> up and refactored that code to be more sane.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From thmpsn.m.k at gmail.com  Tue Feb  3 14:10:19 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Tue, 3 Feb 2009 11:10:19 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<mailman.8710.1233684330.3487.python-list@python.org>
Message-ID: <dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>

On Feb 3, 12:05?pm, David Cournapeau <courn... at gmail.com> wrote:
> On Wed, Feb 4, 2009 at 2:36 AM, ?<thmpsn.... at gmail.com> wrote:
> > On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
> >> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> >> > Here we go again. If you have access to the source code (as you nearly
> >> >> > always do with Python code), then "breaking the language-enforced data
> >> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> >> > equivalent).
>
> >> >> If it's that trivial to defeat something that its proponents appear to
> >> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> >> of using "private" in the first place?
>
> >> >> --
> >> >> Rhodri James *-* Wildebeeste Herder to the Masses
>
> >> > If a library developer releases the source code of a library, any user
> >> > can trivially "defeat" the access restrictions. But if a team of
> >> > developers is checking in code for a project, the leader(s) of the
> >> > project can insist that the access restrictions be respected to
> >> > simplify the management of interfaces. The larger the team, the more
> >> > useful that can be. That's why Java, C++, Ada, Scala, and other
> >> > languages have a "private" keyword.
>
> >> I think a lof of this "discussion" is caused by different usages of
> >> private. My understanding is that you think private is missing in
> >> python because there is no clear different between a member which is
> >> published (part of the API) and one which is not (e.g. whose behavior
> >> may change between different revisions, even minor). I agree the
> >> underscore is not an ideal solution - it is certainly not followed by
> >> all python code out there (not even in python itself - see distutils
> >> for example).
>
> >> But I think you are overstating the advantage of private for that
> >> usage, at least for C++. In C++, if you have a public class in a
> >> header:
>
> >> class Foo {
> >> ? ? private:
> >> ? ? ? ? int f;
>
> >> };
>
> >> It means f is private (cannot be accessed outside Foo instances), but
> >> it is declared in the public header. Actually, when people means this
> >> kind of 'data-hiding', C++ does not bring anything to C itself - after
> >> all, we have used FILE* for years and I have no idea about the FILE
> >> structure.
>
> > Your lack of knowledge about it doesn't mean that it has somehow
> > magically "private" members. The only reason that most of us don't
> > know what a FILE is is that it's definition is implementation-defined
> > (i.e., every compiler may define it differently).
>
> > That doesn't have anything to do with private members. For example, on
> > my system, <stdio.h> defines FILE as:
>
> > struct _iobuf {
> > ? ? ? ?char *_ptr;
> > ? ? ? ?int ? _cnt;
> > ? ? ? ?char *_base;
> > ? ? ? ?int ? _flag;
> > ? ? ? ?int ? _file;
> > ? ? ? ?int ? _charbuf;
> > ? ? ? ?int ? _bufsiz;
> > ? ? ? ?char *_tmpfname;
> > ? ? ? ?};
> > typedef struct _iobuf FILE;
>
> Hm, I guess it depends on the implementation, but it is at least
> possible in C to completely hide the structure, by declaring only a
> pointer, and defining the structure outside any public header file.
> Then, you cannot accidentally access any member - it would result in a
> compiler error.

I've done that to implement ADTs (abstract data types, also known as
opaque types), but it's far from optimal, mainly because:

- The compiler doesn't know the size of the class/struct (since it
hasn't seen its definition), so you have to provide some sort of
"constructor" function that's defined in the same file in which the
class/struct is defined. This function will allocate memory for the
object using malloc()/new and return a pointer to it. Of course, since
memory allocated using malloc()/new has to be released using free()/
delete, you also have to provide a "destructor" function that does
this, and the user *always* has to call both the constructor function
and the destructor function *explicitly*, which is VERY cumbersome (as
opposed to C++ constructors/destructors, which are called
automatically at object creation/deletion, and which you don't always
need to provide unless you have to do some initialization/cleanup).

- Memory allocated with malloc()/new is allocated on the heap (as
opposed to variables that you simply declare locally, which are
allocated on the stack), and heap memory allocation is slower than
stack memory allocation (not that you have to worry about this
overhead except in really high-performance applications).

In short, you pay too high a price for using an object whose size
isn't known at compile time.

> This method is also used in C++, that's the pimpl pattern. It is used
> for various purposes (avoid long compilation times when changing some
> private implementation, actual data hiding), but the underlying idea
> is that you hide the implementation from the public headers. That's
> used for example by QT, and many other C++ libraries.
>
> This shows quite strongly the limitations of the whole private/public
> business in C++.

What limitations? The only limitations I see are the ones associated
with opaque types (what you mentioned above).



From giles.thomas at resolversystems.com  Tue Feb  3 14:12:45 2009
From: giles.thomas at resolversystems.com (Giles Thomas)
Date: Tue, 3 Feb 2009 11:12:45 -0800 (PST)
Subject: Resolver One 1.4 beta - with IronPython 2.0 and numpy
Message-ID: <c1dddae8-fef3-4380-949a-6ab24818456d@v18g2000pro.googlegroups.com>

Hi all,

Version 1.4 of Resolver One, our Pythonic spreadsheet, uses the
Ironclad project to provide (alpha-level) support for numpy in a
IronPython application.  You can put numpy matrices in spreadsheet
cells and manipulate them like any other data - there's a 4-minute
screencast here: <http://www.resolversystems.com/screencasts/numpy/>

We're releasing the beta tomorrow: this has a few performance problems
but is otherwise functionally complete.  If you're interested in
trying it out, drop me a line.


Best regards,

Giles
--
Giles Thomas
MD & CTO, Resolver Systems Ltd.
giles.thomas at resolversystems.com
+44 (0) 20 7253 6372

Win up to $17,000 for a spreadsheet: <http://www.resolversystems.com/
competition/>

17a Clerkenwell Road, London EC1M 5RD, UK
VAT No.: GB 893 5643 79
Registered in England and Wales as company number 5467329.
Registered address: 843 Finchley Road, London NW11 8NA, UK


From btaylordesign at gmail.com  Tue Feb  3 14:16:25 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 11:16:25 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
Message-ID: <4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>

On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> <btaylordes... at gmail.com> escribi?:
>
> > I'm having an issue specifying the path for extracting files from
> > a .zip archive. In my method, I have:
>
> > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> > What is happening is that the extract method is creating a folder with
> > the name of 'zip_name' and extracting the files to it. Example:
>
> extract will create all directories in member name. Use open instead:
>
> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
> ? ? ?shutil.copyfileobj(source, target)
>
> (untested)
>
> --
> Gabriel Genellina


Hi Gabriel,

Thank you for the code sample. I figured I was going to have to use
'open', but I completely forgot about the 'with' statement. I was
trying to figure out how to get access to the file object in the zip
without having to loop over all of the items, and 'with' will allow me
to do just that.

I'll give it a shot when I get home this evening and post my results.

Kind regards,
Brandon


From deets at nospam.web.de  Tue Feb  3 14:22:25 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 20:22:25 +0100
Subject: Path question
In-Reply-To: <mailman.8716.1233686855.3487.python-list@python.org>
References: <mailman.8716.1233686855.3487.python-list@python.org>
Message-ID: <6urjrhFgvif8U1@mid.uni-berlin.de>

Geert Vancompernolle schrieb:
> Hi,
> 
> I have the following path construction:
> 
> ./src/__init__.py
>     /main.py
>     /modules/__init__.py
>             /application.py
>     /ui/__init__.py
>        /mainwindow/__init__.py
>                   /mainwindow.py
> 
> Now I want to call the method 'MainWindow' in the module 'mainwindow', 
> from the module 'application'.
> 
> I'm having the following import statement in 'applications.py':
> 
> from .. ui.mainwindow.mainwindow import MainWindow
> 
> That doesn't work.  I've also tried many other combinations like from 
> ..ui.mainwindow...  but none of them work.
> 
> I always get the following error:
> 
> "Attempted relative import beyond toplevel package"
> 
> How can I import the method 'MainWindow' from 'mainwindow' into 
> 'application', using the explicit relative import rules?
> 
> Or is there a better way to do this?
>  

Rename "src" to "myapp", and start main.py from above that. That should 
work.



Diez


From rdmurray at bitdance.com  Tue Feb  3 14:25:16 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 19:25:16 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<5b8d13220902031005k538c1d12ufb8bede897f43a7c@mail.gmail.com>
Message-ID: <gma5mr$nae$1@ger.gmane.org>

Quoth David Cournapeau <cournape at gmail.com>:
> On Wed, Feb 4, 2009 at 2:36 AM,  <thmpsn.m.k at gmail.com> wrote:
> >
> > Pretty much, unless maybe the code documents what you're not supposed
> > to access:
> 
> But that's my point: that's just not true for many packages I have
> used - some packages do follow the _ convention, some don't. For
> example, to take an example I am somewhat familiar with: distutils
> does not follow this at all. There is no documentation, and it is
> almost impossible to know what's the API from implementation details,
> the interface is leaking everywhere. Now, distutils is an "old"
> package, but my experience at least showed me that this is relatively
> common.
> 
> There are some relatively well known packages which use a different
> mechanism to clearly separate the intended API, without using the _
> convention, or more exactly in supplement of it.

This whole issue gets more complicated, I think, when you consider that
what is "public" versus "private" in an API depends on the consumer.
That is, you might have a group of modules that use a package-internal
interface, while what the "outside world" is supposed to use is a more
restricted API.  The package-internal interface isn't _private_ in the
sense of hiding things from anybody outside the class or its subclasses,
but neither is it public.

I won't be surprised to hear that languages with data hiding have some
provision for this, but to my mind this is a "one, two, many" situation.
That is, if you have one case, things are trivially simple.  If you have
two cases, you can differentiate them.  But once you have three cases,
you almost certainly have _more_ than three cases...in other words a
problem in generalization.

In my code I generally use _ for stuff that is class-private, and document
the "outside" or "stable" API, and everything else is...whatever it needs
to be.  Perhaps the packages you are thinking of do something similar?

--RDM



From gandalf at shopzeus.com  Tue Feb  3 14:32:51 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 03 Feb 2009 20:32:51 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
Message-ID: <49889BE3.7030206@shopzeus.com>

Does anyone know how to get firebird 1.5 driver (kinterbasdb) for 
FireBird 1.5?

My problem:

    * python 2.6 already installed on a server
    * there is a firebird 1.5 database on the same server
    * I need to access it from python 2.6

Any thoughts?




From steve at holdenweb.com  Tue Feb  3 14:37:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 14:37:08 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>
Message-ID: <gma6d8$p20$1@ger.gmane.org>

Tim Rowe wrote:
> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
> 
>> real programmers use ed.
> 
> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
> our bare teeth...
> 
Cards? Teeth? You were lucky! We 'ad ter stare at t'paper tape until the
intensity of our gaze burned holes in it. If yer got one wrong yer 'ad
ter tear it up and start all over again.

And yer tell these young folk and they just don't believe yer.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From martin at v.loewis.de  Tue Feb  3 14:58:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 03 Feb 2009 20:58:41 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <4988a1f1$0$3390$9b622d9e@news.freenet.de>

Robin Becker wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or could
> it be the vmware system caching all writes etc etc? 

I follow David's guess that Linux does better IO than Windows (not
knowing anything about the benchmark, of course)

Regards,
Martin


From jcd at sdf.lonestar.org  Tue Feb  3 15:01:17 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 03 Feb 2009 15:01:17 -0500
Subject: English-like Python
In-Reply-To: <498863CF.7010402@strout.net>
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org>
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>
	<497899D0.5030706@strout.net>
	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu>
	<498863CF.7010402@strout.net>
Message-ID: <1233691277.9141.6.camel@aalcdl07.lib.unc.edu>


On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
> J. Cliff Dyer wrote:
> 
> > But what if your language allows functions to be used as first class
> > objects?  (Mine does :))  
> > 
> > x = Beep
> > 
> > Does that assign the name x to the Beep object or does it assign the
> > result of a Beep call to x?
> 
> It assigns the result.  To assign the name to the Beep object requires a 
> bit of additional syntax; in RB, this would be
> 
>   x = AddressOf Beep
> 
> > There's no virtue in making ridiculously simple things even simpler if
> > it makes the interesting things impossible.
> 
> Of course.  The goal is (or should be) to make the common things 
> ridiculously simple, and make the uncommon things only somewhat less so. 
>   Even in Python, it is far more common to invoke a function than to 
> need a reference to it.  So invoking a function should be the thing that 
> requires no extra syntax (even including "()").  Getting a reference to 
> it, which is less common, should be the thing that requires more syntax.
> 

Except that now you have introduced an inconsistency into python.  What
does the following mean?

my_object = MyObject()
x = my_object

What if MyObject defines a method named __call__?

Now some objects are passed around using

x = my_object

while others require

x = AddressOf my_object

and the only way to tell which is which is to check the object for the
presence of a __call__ method.  

This seems like a serious inconsistency to me.

> Cheers,
> - Joe
> 

Cliff



From mccredie at gmail.com  Tue Feb  3 15:03:17 2009
From: mccredie at gmail.com (Matimus)
Date: Tue, 3 Feb 2009 12:03:17 -0800 (PST)
Subject: Window (tkinter) with no decoration
References: <mailman.8704.1233680790.3487.python-list@python.org>
Message-ID: <28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>

On Feb 3, 8:58?am, Djames Suhanko <djames.suha... at gmail.com> wrote:
> Hello, programmers!
> ?I would like to do a menu bar like kicker or windows menu. is possible?
>
> --
> Djames Suhanko
> LinuxUser 158.760

Maybe you are looking for this?

import Tkinter

rt = Tkinter.Tk()
rt.overrideredirect(True)

# do stuff


Matt


From robert.kern at gmail.com  Tue Feb  3 15:18:37 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 03 Feb 2009 14:18:37 -0600
Subject: what IDE is the best to write python?
In-Reply-To: <hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <gma8qu$38g$1@ger.gmane.org>

On 2009-02-03 12:19, Catherine Heathcote wrote:
> Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>
>>> real programmers use ed.
>>
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>
> You had teeth!?!
>
> Oh and hi, I shall be a new face in the crowd ;)

Welcome!

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From djames.suhanko at gmail.com  Tue Feb  3 15:18:38 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Tue, 3 Feb 2009 18:18:38 -0200
Subject: Window (tkinter) with no decoration
In-Reply-To: <28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>
References: <mailman.8704.1233680790.3487.python-list@python.org>
	<28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>
Message-ID: <fd9e6bba0902031218n34042080pac79e73b862d24b9@mail.gmail.com>

Exactly !
 I thank you very much, Matimus !!!

>>  I would like to do a menu bar like kicker or windows menu. is possible?

> Maybe you are looking for this?
> rt = Tkinter.Tk()
> rt.overrideredirect(True)


-- 
Djames Suhanko
LinuxUser 158.760


From deets at nospam.web.de  Tue Feb  3 15:27:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 21:27:48 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <6urnm4Fgv092U1@mid.uni-berlin.de>

Robin Becker schrieb:
> Whilst doing some portability testing with reportlab I noticed a strange 
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the 
> x64 working faster at its design sizes or perhaps the compiler or could 
> it be the vmware system caching all writes etc etc? For the red hat x64 
> build the only special configuration was to use ucs2
> 
> I know that the VT bit stuff has made virtualization much better, but 
> this seems a bit weird.


AFAIK some VMs have difficulties with timers. For example, my 
virtualized KDE has that jumping icon when starting a program - and 
that's *much* faster jumping inside VBox :)

So - are you sure it *is* faster?

Diez


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 15:28:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 18:28:54 -0200
Subject: Safe to get address of va_list function parameter?
References: <YSWhl.1000$eK2.715@nwrddc01.gnilink.net>
	<ln64jrxplr.fsf@nuthaus.mib.org>
Message-ID: <op.uoslugeix6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 03 Feb 2009 15:31:21 -0200, Keith <no at spam.thanks> escribi?:

> Is it safe to get the address of a va_list function parameter?

Wrong group...

-- 
Gabriel Genellina



From istvan.albert at gmail.com  Tue Feb  3 15:34:00 2009
From: istvan.albert at gmail.com (Istvan Albert)
Date: Tue, 3 Feb 2009 12:34:00 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au> 
	<gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
Message-ID: <e05495f4-7b4d-4186-95c0-70ea7eec3fa4@u1g2000vbb.googlegroups.com>

On Feb 2, 12:06?pm, Thorsten Kampe <thors... at thorstenkampe.de> wrote:

> > It makes my eyes bleed
>
> Ever tried sunglasses?

Sunglasses for bleeding eyes? For pete's sake try bandages.


From dunmer at dreams.sk  Tue Feb  3 15:47:22 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 21:47:22 +0100
Subject: python libpcap equivalent
Message-ID: <4988AD5A.1030706@dreams.sk>

Hello

I need to write a software router [yes, software equivalent to a 
hardware box that is routing packets .)]. It's a school
work..
Question is: is possible write this kind of application in python? and 
if it's, what module should i use?
I tried search for some libpcap equivalent in python and found 
pylibpcap, but can't find documentation and tutorial.



From dunmer at dreams.sk  Tue Feb  3 15:47:22 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 21:47:22 +0100
Subject: python libpcap equivalent
Message-ID: <4988AD5A.1030706@dreams.sk>

Hello

I need to write a software router [yes, software equivalent to a 
hardware box that is routing packets .)]. It's a school
work..
Question is: is possible write this kind of application in python? and 
if it's, what module should i use?
I tried search for some libpcap equivalent in python and found 
pylibpcap, but can't find documentation and tutorial.


From steve at holdenweb.com  Tue Feb  3 15:53:00 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 15:53:00 -0500
Subject: English-like Python
In-Reply-To: <1233691277.9141.6.camel@aalcdl07.lib.unc.edu>
References: <1232067775.15931.25.camel@localhost>	<mailman.7483.1232288138.3487.python-list@python.org>	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>	<mailman.7631.1232477957.3487.python-list@python.org>	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>	<mailman.7687.1232551157.3487.python-list@python.org>	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>	<497899D0.5030706@strout.net>	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu>	<498863CF.7010402@strout.net>
	<1233691277.9141.6.camel@aalcdl07.lib.unc.edu>
Message-ID: <gmaarh$9qv$1@ger.gmane.org>

J. Cliff Dyer wrote:
> On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
>> J. Cliff Dyer wrote:
>>
>>> But what if your language allows functions to be used as first class
>>> objects?  (Mine does :))  
>>>
>>> x = Beep
>>>
>>> Does that assign the name x to the Beep object or does it assign the
>>> result of a Beep call to x?
>> It assigns the result.  To assign the name to the Beep object requires a 
>> bit of additional syntax; in RB, this would be
>>
>>   x = AddressOf Beep
>>
>>> There's no virtue in making ridiculously simple things even simpler if
>>> it makes the interesting things impossible.
>> Of course.  The goal is (or should be) to make the common things 
>> ridiculously simple, and make the uncommon things only somewhat less so. 
>>   Even in Python, it is far more common to invoke a function than to 
>> need a reference to it.  So invoking a function should be the thing that 
>> requires no extra syntax (even including "()").  Getting a reference to 
>> it, which is less common, should be the thing that requires more syntax.
>>
> 
> Except that now you have introduced an inconsistency into python.  What
> does the following mean?
> 
> my_object = MyObject()
> x = my_object
> 
> What if MyObject defines a method named __call__?
> 
> Now some objects are passed around using
> 
> x = my_object
> 
> while others require
> 
> x = AddressOf my_object
> 
> and the only way to tell which is which is to check the object for the
> presence of a __call__ method.  
> 
> This seems like a serious inconsistency to me.
> 
Time for my annual comment on the apparent requirement for DWIM-mode Python.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Tue Feb  3 15:57:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 18:57:29 -0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <op.uosm53ydx6zn5v@gabriel2.softlabbsas.com.ar>

En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com>  
escribi?:

> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.

So _foo becomes foo. Then:

class X(object):
     def get_foo(self): return self._foo
     def set_foo(self, value): self._foo = value
     foo = property(get_foo, set_foo)

You have the public name "foo", for new usage outside the library, and the  
private name "_foo", for internal use only. And we're all happy. If it  
weren't for your "historical" reasons, using those trivial get/set  
functions is rather silly.

-- 
Gabriel Genellina



From imageguy1206 at gmail.com  Tue Feb  3 16:01:53 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Tue, 3 Feb 2009 13:01:53 -0800 (PST)
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
References: <mailman.8719.1233689579.3487.python-list@python.org>
Message-ID: <ee94f6fd-9fb0-4c7b-99db-1258a32efcb0@x16g2000prn.googlegroups.com>

On Feb 3, 2:32?pm, Laszlo Nagy <gand... at shopzeus.com> wrote:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
>
> My problem:
>
> ? ? * python 2.6 already installed on a server
> ? ? * there is a firebird 1.5 database on the same server
> ? ? * I need to access it from python 2.6
>
> Any thoughts?

Have you asked on the Firebird list ?
The original maintainer of kinterbasedb passed away and maintenance
was taken over by the Firebird project.  See this link.
http://www.firebirdsql.org/index.php?op=devel&sub=python

Sorry, but that is the best I can do.

g.



From http  Tue Feb  3 16:05:01 2009
From: http (Paul Rubin)
Date: 03 Feb 2009 13:05:01 -0800
Subject: x64 speed
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <7xy6wn1bb6.fsf@ruckus.brouhaha.com>

Robin Becker <robin at reportlab.com> writes:
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or
> could it be the vmware system caching all writes etc etc? For the red
> hat x64 build the only special configuration was to use ucs2

You have to control all these variables separately in order to know.
But, 64 bit code is in general faster than 32 bit code when properly
compiled: more cpu registers, wider moves when copying large blocks of
data, floating point registers instead of the legacy stack-oriented
FPU, etc.


From robin at NOSPAMreportlab.com  Tue Feb  3 16:20:23 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:20:23 +0000
Subject: x64 speed
In-Reply-To: <6urnm4Fgv092U1@mid.uni-berlin.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<6urnm4Fgv092U1@mid.uni-berlin.de>
Message-ID: <4988B517.1090108@jessikat.plus.net>

Diez B. Roggisch wrote:
> Robin Becker schrieb:
>> Whilst doing some portability testing with reportlab I noticed a 
>> strange speedup for our unittest suite with python2.5
>>
>> host  win32 xp3 unittest time=42.2 seconds
>> vmware RHEL x64 unittest time=30.9 seconds
>>
>> so it looks like the vmware emulated system is much faster. Is it the 
>> x64 working faster at its design sizes or perhaps the compiler or 
>> could it be the vmware system caching all writes etc etc? For the red 
>> hat x64 build the only special configuration was to use ucs2
>>
>> I know that the VT bit stuff has made virtualization much better, but 
>> this seems a bit weird.
> 
> 
> AFAIK some VMs have difficulties with timers. For example, my 
> virtualized KDE has that jumping icon when starting a program - and 
> that's *much* faster jumping inside VBox :)
> 
......
> Diez
I started both in terminals and the host never wins :)

-- 
Robin Becker


From robin at NOSPAMreportlab.com  Tue Feb  3 16:21:47 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:21:47 +0000
Subject: x64 speed
In-Reply-To: <7xy6wn1bb6.fsf@ruckus.brouhaha.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<7xy6wn1bb6.fsf@ruckus.brouhaha.com>
Message-ID: <4988B56B.9040203@jessikat.plus.net>

Paul Rubin wrote:
> Robin Becker <robin at reportlab.com> writes:
>> so it looks like the vmware emulated system is much faster. Is it the
>> x64 working faster at its design sizes or perhaps the compiler or
>> could it be the vmware system caching all writes etc etc? For the red
>> hat x64 build the only special configuration was to use ucs2
> 
> You have to control all these variables separately in order to know.
> But, 64 bit code is in general faster than 32 bit code when properly
> compiled: more cpu registers, wider moves when copying large blocks of
> data, floating point registers instead of the legacy stack-oriented
> FPU, etc.

I tried looking at the cpu usage whilst running these and by eye it 
seemed that the host system was running more parallel stuff than the 
vmware vm.
-- 
Robin Becker


From robin at NOSPAMreportlab.com  Tue Feb  3 16:22:13 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:22:13 +0000
Subject: x64 speed
In-Reply-To: <ikcm56-lmq.ln1@ozzie.tundraware.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<ikcm56-lmq.ln1@ozzie.tundraware.com>
Message-ID: <4988B585.5080909@jessikat.plus.net>

Tim Daneliuk wrote:
......
> 
> Which vmware product?
> 

vmware server
-- 
Robin Becker


From sevillad at gmail.com  Tue Feb  3 16:24:17 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 13:24:17 -0800 (PST)
Subject: Locating python
Message-ID: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>

Hi,

Apologies if this was answered somewhere else, I have not found
anything similar anywhere.

I have SUSE 11.0 and I am trying to install a program called
mnemosyne. I need easy_install for this, for which I installed
setuptools through yast2. But when I run easy_install for the final
installation, I get an error like this:

[...]
[Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
packages/test-easy-install-3728.pth'

The installation directory you specified (via --install-dir, --prefix,
or the distutils default setting) was:

    /usr/local/lib/python2.5/site-packages/

This directory does not currently exist. [...]

>From what I have gathered by reading here and there, it seems that the
actual path for site-packages is not the place where it is being
looked for. Sure enough, I have /usr/local/lib/python2.5/site-
packages/ . What worries me is that there is no file called test*
there, and I am not even able to find the site.py file mentioned in
site-packages/README. I suspect that I have two concurrent
installations or something like that (I do have python and python2.5
inside /usr/lib). How do I untangle this? Or at least how do I get
easy_install to find the right place?

Thanks a lot,

David


From robin at NOSPAMreportlab.com  Tue Feb  3 16:24:37 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:24:37 +0000
Subject: x64 speed
In-Reply-To: <4988a1f1$0$3390$9b622d9e@news.freenet.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
Message-ID: <4988B615.4060206@jessikat.plus.net>

Martin v. L?wis wrote:
.....
> I follow David's guess that Linux does better IO than Windows (not
> knowing anything about the benchmark, of course)
> 
> Regards,
> Martin

I originally thought it must be the vmware host stuff offloading IO to 
the second core, but watching with sysinternals didn't show a lot of 
extra stuff going on with the vm compared to just running on the host.
-- 
Robin Becker


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 16:42:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 19:42:02 -0200
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com> <gma2al$a5p$1@ger.gmane.org>
	<775033410902031110m2437f858n4affa3a0a92dd90a@mail.gmail.com>
Message-ID: <op.uoso8cmfx6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 03 Feb 2009 17:10:18 -0200, er <erobererunc at gmail.com> escribi?:

> It might be nice if Python could provide a global dictionary, perhaps  
> _G{},
> where you can throw things.  This is actually the solution provided by  
> the
> Lua scripting language.  Thanks for the global_ module solution, I was  
> just
> making sure that was the canonical way.

You *could* do that now, just inject a dictionary into the builtin module.  
sitecustomize.py would be the place to do that (it's executed before the  
main script).

	import __builtin__
	__builtin__.globalvars = {}

Then you can use globalvars[...] everywhere. But your code won't run in  
other locations, nor can you distribute it, you'll have to repeat the same  
steps when you upgrade your Python version, and people will wonder *where*  
such variable name comes from...

Too much trouble, only to avoid typing a single line:

	from config import globalvars

and it doesn't have any of the drawbacks listed above. I'd use import.

-- 
Gabriel Genellina



From martin at v.loewis.de  Tue Feb  3 16:45:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 03 Feb 2009 22:45:12 +0100
Subject: x64 speed
In-Reply-To: <4988B615.4060206@jessikat.plus.net>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
	<4988B615.4060206@jessikat.plus.net>
Message-ID: <4988BAE8.2060204@v.loewis.de>

>> I follow David's guess that Linux does better IO than Windows (not
>> knowing anything about the benchmark, of course)
>>
> I originally thought it must be the vmware host stuff offloading IO to
> the second core, but watching with sysinternals didn't show a lot of
> extra stuff going on with the vm compared to just running on the host.

I'm not talking about vmware. I'm suggesting that Linux ext3, and the
Linux buffer handling, is just more efficient than NTFS, and the Windows
buffer handling.

If you split the total runtime into system time and user time, how do
the 30s split up?

Regards,
Martin


From aahz at pythoncraft.com  Tue Feb  3 16:53:39 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 Feb 2009 13:53:39 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <gmaed3$c2j$1@panix3.panix.com>

In article <hV%hl.29854$Sp5.19680 at text.news.virginmedia.com>,
Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>> 
>>> real programmers use ed.
>> 
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>
>You had teeth!?!
>
>Oh and hi, I shall be a new face in the crowd ;)

Welcome!  Looks like you'll fit right ni.

(Yes, that's a typo but it's such a lovely one...)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From castironpi at gmail.com  Tue Feb  3 16:59:53 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 3 Feb 2009 13:59:53 -0800 (PST)
Subject: English-like Python
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org> 
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com> 
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au> 
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au> 
	<497899D0.5030706@strout.net>
	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu> 
	<498863CF.7010402@strout.net>
	<mailman.8721.1233691289.3487.python-list@python.org>
Message-ID: <356f70e4-abd6-4fdd-9c4c-c802fbb4f67b@r41g2000prr.googlegroups.com>

On Feb 3, 2:01?pm, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
> > J. Cliff Dyer wrote:
>
> > > But what if your language allows functions to be used as first class
> > > objects? ?(Mine does :)) ?
>
> > > x = Beep
>
> > > Does that assign the name x to the Beep object or does it assign the
> > > result of a Beep call to x?
>
> > It assigns the result. ?To assign the name to the Beep object requires a
> > bit of additional syntax; in RB, this would be
>
> > ? x = AddressOf Beep
>
> > > There's no virtue in making ridiculously simple things even simpler if
> > > it makes the interesting things impossible.
>
> > Of course. ?The goal is (or should be) to make the common things
> > ridiculously simple, and make the uncommon things only somewhat less so.
> > ? Even in Python, it is far more common to invoke a function than to
> > need a reference to it. ?So invoking a function should be the thing that
> > requires no extra syntax (even including "()"). ?Getting a reference to
> > it, which is less common, should be the thing that requires more syntax.
>
> Except that now you have introduced an inconsistency into python. ?What
> does the following mean?
>
> my_object = MyObject()
> x = my_object
>
> What if MyObject defines a method named __call__?
>
> Now some objects are passed around using
>
> x = my_object
>
> while others require
>
> x = AddressOf my_object
>
> and the only way to tell which is which is to check the object for the
> presence of a __call__ method. ?
>
> This seems like a serious inconsistency to me.
>
> > Cheers,
> > - Joe
>
> Cliff

Well, just return to the natural language we're trying to model.

x= going to the store
x= go to the store

Imperatives don't usually return values.

x= the process of going to the store
x= the result of going to the store

I'm starting to think that PLs and NLs are quite dissimilar.  What do
return values are denoting phrases:

x= the man in the corner
x= the man in the corner talking to the woman

Once you've established the subject, you usually make declarations
about him/er/it.

was_at_the_mall_today( x )
talked_to_me_earlier( x )

Usually you expect your audience to have reasoning capacities, and
giving them declarative knowledge is preemptive to the need to give
them orders later on.

Ideally, interactions could take place entirely in the declarative:
introduce yourself and wait-style.


From piers at it.usyd.edu.au  Tue Feb  3 17:07:06 2009
From: piers at it.usyd.edu.au (Piers Lauder)
Date: Wed, 04 Feb 2009 09:07:06 +1100
Subject: imaplib thread method anomaly
References: <113545.23852.qm@web54507.mail.re2.yahoo.com>
Message-ID: <1233698829.49.72156511@it.usyd.edu.au>

On Tue, 3 Feb 2009 05:22:01 -0800 (PST), Mr SZ wrote:
  > 
  > I was looking at the thread functionality of IMAP4rev1 servers with the
  > threading extension. Here is my output with debug=8 :
  > 
  > 
  > 
  >   02:23.02 > GDJB3 UID THREAD references UTF-8 (SEEN)
  >   02:23.02 < * THREAD (3)(2)(4)(1)
  >   02:23.02 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  >   02:23.03 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  >   02:23.03 < GDJB3 OK Thread completed.
  >   02:23.03 	matched r'(?P<tag>GDJB\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('GDJB3', 'OK', 'Thread completed.')
  > [None]
  > 
  > ...
  > 
  > 
  >   02:59.22 > CNCF3 THREAD references UTF-8 (SEEN)
  >   02:59.23 < * THREAD (3)(2)(4)(1)
  >   02:59.23 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  >   02:59.23 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  >   02:59.23 < CNCF3 OK Thread completed.
  >   02:59.23 	matched r'(?P<tag>CNCF\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('CNCF3', 'OK', 'Thread completed.')
  >   02:59.23 untagged_responses[THREAD] => ['(3)(2)(4)(1)']
  > ['(3)(2)(4)(1)']
  > 
  > 
  > As you can see, the first is a UID command and the second is calling the
  > thread method. Also, the server responses are the same for both. So why is
  > one returning None and the other returning the correct response? I'm using
  > python2.4 and I'm stuck with it as I'm using it in a zope environment.

In one of life's weird coincidences - someone else just created
bugs.python.org issue5146 on this.

The fix is a change in the method 'uid' to read:

	...
        if command in ('SEARCH', 'SORT', 'THREAD'):
            name = command
        else:
            name = 'FETCH'
	...


(Thanks to <abhishek at synovel.com>)

Piers Lauder





From lists at cheimes.de  Tue Feb  3 17:19:26 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:19:26 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <49889BE3.7030206@shopzeus.com>
References: <49889BE3.7030206@shopzeus.com>
Message-ID: <gmaftf$rnn$1@ger.gmane.org>

Laszlo Nagy schrieb:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
> 
> My problem:
> 
>    * python 2.6 already installed on a server
>    * there is a firebird 1.5 database on the same server
>    * I need to access it from python 2.6
> 
> Any thoughts?

kinterbasdb 3.2.2 and 3.3.0 are working perfectly fine with Python 2.6.
You can install it in less than 2 minutes with the usual tar -xzf &&
python2.6 setup.py install dance. I don't know if the latest versions of
kinterbasdb still support 1.5.

Christian



From simon at brunningonline.net  Tue Feb  3 17:20:44 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 3 Feb 2009 22:20:44 +0000
Subject: JDBC in CPYTHON
In-Reply-To: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
Message-ID: <8c7f10c60902031420y1cc5647flcbde2aedd9e66c92@mail.gmail.com>

2009/2/3 KMCB <kmcbrearty at yahoo.com>:
> I was wondering if anyone was aware of a JDBC DBAPI module for
> cpython.  I have looked at PYJDBC and was interested in avoiding using
> that extra level of ICE.  I was thinking maybe someone would have back
> ported zxJDBC from Jython.  Or used that as a starting point, to
> create a module and had a C based wrapper for the driver.  This type
> of activity was talked about back in 2004 on this forum, but I was
> wondering if anyone had newer information.

I don't know if <http://jpype.sourceforge.net/> or
<http://www.boddie.org.uk/python/javaclass.html> might be of help.

-- 
Cheers,
Simon B.


From kyosohma at gmail.com  Tue Feb  3 17:24:48 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 3 Feb 2009 14:24:48 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
Message-ID: <c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>

On Feb 3, 3:24?pm, David Sevilla <sevil... at gmail.com> wrote:
> Hi,
>
> Apologies if this was answered somewhere else, I have not found
> anything similar anywhere.
>
> I have SUSE 11.0 and I am trying to install a program called
> mnemosyne. I need easy_install for this, for which I installed
> setuptools through yast2. But when I run easy_install for the final
> installation, I get an error like this:
>
> [...]
> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> packages/test-easy-install-3728.pth'
>
> The installation directory you specified (via --install-dir, --prefix,
> or the distutils default setting) was:
>
> ? ? /usr/local/lib/python2.5/site-packages/
>
> This directory does not currently exist. [...]
>
> From what I have gathered by reading here and there, it seems that the
> actual path for site-packages is not the place where it is being
> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> packages/ . What worries me is that there is no file called test*
> there, and I am not even able to find the site.py file mentioned in
> site-packages/README. I suspect that I have two concurrent
> installations or something like that (I do have python and python2.5
> inside /usr/lib). How do I untangle this? Or at least how do I get
> easy_install to find the right place?
>
> Thanks a lot,
>
> David

I would get setuptools from the official source:

http://peak.telecommunity.com/DevCenter/setuptools
http://pypi.python.org/pypi/setuptools

Install it using the python of your choice. You may have to pass a
full path to the python "binary" to make sure you're using the right
one. So, after downloading and decompressing the setuptools package,
change directory into it. Then run something like this:

/path/to/python setup.py install

I think that will work...of course, your mileage may vary. I haven't
used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
You might be able to just use that too..

Mike


From steve at holdenweb.com  Tue Feb  3 17:27:47 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:27:47 -0500
Subject: Reading text file with wierd file extension?
In-Reply-To: <3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>
Message-ID: <gmagd5$ski$1@ger.gmane.org>

John Machin wrote:
> On Feb 3, 8:07 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> 
>> This is written very slowly, so you can read it better:
>>
>> Please post the traceback.
> 
> *AND* please post the text of the IOError message
> 
> *AND* please do yourself a favour and move your files out of the root
> directory into a directory with a meaningful name

*AND* please don't take offense, as all this gratuitous advice is meant
to allow us to better help you!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Tue Feb  3 17:30:26 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:30:26 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
Message-ID: <3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>


the exact details of what you are reporting seem a bit odd, but i have
seen a similar error because i have tried to use my own account to
install the package, instead of using root.

what i believe happens is that easy_install first tries to create the
"test" file, and then checks it is there.  if it is not there, you get
an error.  normally the error explains that you need to run as root,
but i assume in your case it doesn't - that seems odd, but it seemed
worth mentioning anyway.

so if you have not done so, instead of

  python setup.py install

do

  sudo python setup.py install

more generally, i have used opensuse 11.0 and 11.1, and generally
things work just fine, so i would check you are following all the
instructions correctly.

good luck,
andrew

On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
> [...]
> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> packages/test-easy-install-3728.pth'
>
> The installation directory you specified (via --install-dir, --prefix,
> or the distutils default setting) was:
>
> ? ? /usr/local/lib/python2.5/site-packages/
>
> This directory does not currently exist. [...]
>
> From what I have gathered by reading here and there, it seems that the
> actual path for site-packages is not the place where it is being
> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> packages/ . What worries me is that there is no file called test*


From invalid at invalid  Tue Feb  3 17:30:34 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 03 Feb 2009 16:30:34 -0600
Subject: python libpcap equivalent
References: <mailman.8726.1233694063.3487.python-list@python.org>
Message-ID: <m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>

On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:

> I need to write a software router [yes, software equivalent to
> hardware box that is routing packets .)]. It's a school work..

> Question is: is possible write this kind of application in
> python?

Hmm.  It's going to be rather difficult, but you might be able
to.

> and if it's, what module should i use? I tried search for some
> libpcap equivalent in python and found pylibpcap, but can't
> find documentation and tutorial.

You can use pylibpcap to capture packets, and then use a raw
socket to send them out again on whatever interface you want.
You'll have to make sure that the host's OS's network stack
isn't going to process the packets at all.  I'm not sure how
you go about that.

The documentation for pylibpcap is built into the module. See
doc.i in the tarball.


-- 
Grant Edwards                   grante             Yow! I'd like some JUNK
                                  at               FOOD ... and then I want to
                               visi.com            be ALONE --


From sevillad at gmail.com  Tue Feb  3 17:34:07 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 14:34:07 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
Message-ID: <3c83a573-3170-4cf1-9b2d-88e4b639f9a1@p2g2000prf.googlegroups.com>

On Feb 3, 11:24?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 3, 3:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > Apologies if this was answered somewhere else, I have not found
> > anything similar anywhere.
>
> > I have SUSE 11.0 and I am trying to install a program called
> > mnemosyne. I need easy_install for this, for which I installed
> > setuptools through yast2. But when I run easy_install for the final
> > installation, I get an error like this:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
> > there, and I am not even able to find the site.py file mentioned in
> > site-packages/README. I suspect that I have two concurrent
> > installations or something like that (I do have python and python2.5
> > inside /usr/lib). How do I untangle this? Or at least how do I get
> > easy_install to find the right place?
>
> > Thanks a lot,
>
> > David
>
> I would get setuptools from the official source:
>
> http://peak.telecommunity.com/DevCenter/setuptoolshttp://pypi.python.org/pypi/setuptools
>
> Install it using the python of your choice. You may have to pass a
> full path to the python "binary" to make sure you're using the right
> one. So, after downloading and decompressing the setuptools package,
> change directory into it. Then run something like this:
>
> /path/to/python setup.py install
>
> I think that will work...of course, your mileage may vary. I haven't
> used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
> You might be able to just use that too..
>
> Mike

Actually, a manual installation is probably the best thing to do,
since I did use the SUSE package manager (yast2) to install setuptools
and never had a chance to choose installation paths.

Thanks,

David


From sevillad at gmail.com  Tue Feb  3 17:35:31 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 14:35:31 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
Message-ID: <6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>

On Feb 3, 11:30?pm, andrew cooke <and... at acooke.org> wrote:
> the exact details of what you are reporting seem a bit odd, but i have
> seen a similar error because i have tried to use my own account to
> install the package, instead of using root.
>
> what i believe happens is that easy_install first tries to create the
> "test" file, and then checks it is there. ?if it is not there, you get
> an error. ?normally the error explains that you need to run as root,
> but i assume in your case it doesn't - that seems odd, but it seemed
> worth mentioning anyway.
>
> so if you have not done so, instead of
>
> ? python setup.py install
>
> do
>
> ? sudo python setup.py install
>
> more generally, i have used opensuse 11.0 and 11.1, and generally
> things work just fine, so i would check you are following all the
> instructions correctly.
>
> good luck,
> andrew
>
> On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
>
>

I am quite new to Linux, and thought that by using yast2 there would
be no user problems (I am asked for the root password). I will sudo it
to see if it solves the problem.

Thanks,

David


From andrew at acooke.org  Tue Feb  3 17:36:36 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:36:36 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
Message-ID: <df45ffa9-6796-4984-a718-bb520ad944de@v13g2000vbb.googlegroups.com>


sorry, you are using easy_install, so

  sudo easy_install ....

instead of what i said a moment ago.  the important thing is to use
"sudo".

andrew

On Feb 3, 7:30?pm, andrew cooke <and... at acooke.org> wrote:
> the exact details of what you are reporting seem a bit odd, but i have
> seen a similar error because i have tried to use my own account to
> install the package, instead of using root.
>
> what i believe happens is that easy_install first tries to create the
> "test" file, and then checks it is there. ?if it is not there, you get
> an error. ?normally the error explains that you need to run as root,
> but i assume in your case it doesn't - that seems odd, but it seemed
> worth mentioning anyway.
>
> so if you have not done so, instead of
>
> ? python setup.py install
>
> do
>
> ? sudo python setup.py install
>
> more generally, i have used opensuse 11.0 and 11.1, and generally
> things work just fine, so i would check you are following all the
> instructions correctly.
>
> good luck,
> andrew
>
> On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
>
>



From steve at holdenweb.com  Tue Feb  3 17:38:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:38:02 -0500
Subject: python libpcap equivalent
In-Reply-To: <m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
References: <mailman.8726.1233694063.3487.python-list@python.org>
	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
Message-ID: <gmah0b$v5n$1@ger.gmane.org>

Unknown wrote:
> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
> 
>> I need to write a software router [yes, software equivalent to
>> hardware box that is routing packets .)]. It's a school work..
> 
>> Question is: is possible write this kind of application in
>> python?
> 
> Hmm.  It's going to be rather difficult, but you might be able
> to.
> 
>> and if it's, what module should i use? I tried search for some
>> libpcap equivalent in python and found pylibpcap, but can't
>> find documentation and tutorial.
> 
> You can use pylibpcap to capture packets, and then use a raw
> socket to send them out again on whatever interface you want.
> You'll have to make sure that the host's OS's network stack
> isn't going to process the packets at all.  I'm not sure how
> you go about that.
> 
> The documentation for pylibpcap is built into the module. See
> doc.i in the tarball.
> 
> 
And note that this won't work on Vista, where the raw socket interface
is no longer available to standard applications.

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb  3 17:41:01 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:41:01 -0500
Subject: Locating python
In-Reply-To: <c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
Message-ID: <gmah5v$v5n$2@ger.gmane.org>

Mike Driscoll wrote:
> On Feb 3, 3:24 pm, David Sevilla <sevil... at gmail.com> wrote:
>> Hi,
>>
>> Apologies if this was answered somewhere else, I have not found
>> anything similar anywhere.
>>
>> I have SUSE 11.0 and I am trying to install a program called
>> mnemosyne. I need easy_install for this, for which I installed
>> setuptools through yast2. But when I run easy_install for the final
>> installation, I get an error like this:
>>
>> [...]
>> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
>> packages/test-easy-install-3728.pth'
>>
>> The installation directory you specified (via --install-dir, --prefix,
>> or the distutils default setting) was:
>>
>>     /usr/local/lib/python2.5/site-packages/
>>
>> This directory does not currently exist. [...]
>>
>> From what I have gathered by reading here and there, it seems that the
>> actual path for site-packages is not the place where it is being
>> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
>> packages/ . What worries me is that there is no file called test*
>> there, and I am not even able to find the site.py file mentioned in
>> site-packages/README. I suspect that I have two concurrent
>> installations or something like that (I do have python and python2.5
>> inside /usr/lib). How do I untangle this? Or at least how do I get
>> easy_install to find the right place?
>>
>> Thanks a lot,
>>
>> David
> 
> I would get setuptools from the official source:
> 
> http://peak.telecommunity.com/DevCenter/setuptools
> http://pypi.python.org/pypi/setuptools
> 
> Install it using the python of your choice. You may have to pass a
> full path to the python "binary" to make sure you're using the right
> one. So, after downloading and decompressing the setuptools package,
> change directory into it. Then run something like this:
> 
> /path/to/python setup.py install
> 
> I think that will work...of course, your mileage may vary. I haven't
> used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
> You might be able to just use that too..

Easier still:

wget http://peak.telecommunity.com/dist/ez_setup.py
/path/to/python ez_setup.py
rm ez_setup.py

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Tue Feb  3 17:42:02 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:42:02 +0100
Subject: Cross platform compilation?
In-Reply-To: <gm8buh+ofl4@eGroups.com>
References: <gm8buh+ofl4@eGroups.com>
Message-ID: <gmah7q$v66$1@ger.gmane.org>

John Harper schrieb:
> I am trying to build Python to use in an embedded system which uses a 
> ppc_440 CPU. The only information I've found is something written by 
> Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
> seem to have successfully built Python itself, but building the 
> extensions fails miserably with complaints about library format. It 
> insists on referring to "i686" which is indeed the platform it is 
> actually running on.
> 
> Before I try to reverse engineer completely setup.py, is there 
> something obvious that needs to be done to get it to use the right tool 
> chain?
> 
> More generally, it seems like this would be something that lots of 
> people would want to do. I'm surprised there isn't support for it built 
> into the distributed version of Python, without having to hack all the 
> setup files...?

I'm sorry to inform you that Python doesn't support cross platform
compilation. Python eats its own dog food and uses Python to compile
optional extension modules.
Some guys were working on a patch. You may find something in the bug
tracker at http://bugs.python.org

Christian



From spammers at rot.in.hell  Tue Feb  3 17:46:21 2009
From: spammers at rot.in.hell (Eddie Watson)
Date: Tue, 3 Feb 2009 22:46:21 +0000 (UTC)
Subject: function call overhead
Message-ID: <ln6v6lu2nb.fsf@nuthaus.mib.org>

What's the Python function call overhead like?

Eddie Watson
"CLC plonkers in a state of panic!!!"


From andrew at acooke.org  Tue Feb  3 17:47:40 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:47:40 -0800 (PST)
Subject: parse date/time from a log entry with only strftime (and no 
	regexen)
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com> 
	<mailman.8702.1233679732.3487.python-list@python.org>
Message-ID: <7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>

> > ValueError: unconverted data remains: ?this is the remainder of the log ?
> > line
> > that I do not care about

you could catch the ValueError and split at the ':' in the .args
attribute to find the extra data.  you could then find the extra data
in the original string, use the index to remove it, and re-parse the
time.

ugly, but should work.
andrew


From lists at cheimes.de  Tue Feb  3 17:54:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:54:32 +0100
Subject: function call overhead
In-Reply-To: <ln6v6lu2nb.fsf@nuthaus.mib.org>
References: <ln6v6lu2nb.fsf@nuthaus.mib.org>
Message-ID: <gmahv8$2an$1@ger.gmane.org>

Eddie Watson schrieb:
> What's the Python function call overhead like?

Like 6, maybe 7

*scnr*



From dunmer at dreams.sk  Tue Feb  3 17:55:04 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 23:55:04 +0100
Subject: python libpcap equivalent
In-Reply-To: <gmah0b$v5n$1@ger.gmane.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<gmah0b$v5n$1@ger.gmane.org>
Message-ID: <4988CB48.9000304@dreams.sk>

Steve Holden wrote:
> Unknown wrote:
>> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
>>
>>> I need to write a software router [yes, software equivalent to
>>> hardware box that is routing packets .)]. It's a school work..
>>> Question is: is possible write this kind of application in
>>> python?
>> Hmm.  It's going to be rather difficult, but you might be able
>> to.
>>
>>> and if it's, what module should i use? I tried search for some
>>> libpcap equivalent in python and found pylibpcap, but can't
>>> find documentation and tutorial.
>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.
>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>>
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>>
>>
> And note that this won't work on Vista, where the raw socket interface
> is no longer available to standard applications.
> 
> regards
>  Steve
> 


Thanks guys

I don't care about Vista. What i will (i hope only) need is a linux
system with two net devices running router,
XP hosts connected (not only two.. hubs, switches) and these hosts have
to ping via router.



From dunmer at dreams.sk  Tue Feb  3 17:57:02 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 23:57:02 +0100
Subject: python libpcap equivalent
In-Reply-To: <gmah0b$v5n$1@ger.gmane.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<gmah0b$v5n$1@ger.gmane.org>
Message-ID: <4988CBBE.7000408@dreams.sk>

Steve Holden wrote:
> Unknown wrote:
>> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
>>
>>> I need to write a software router [yes, software equivalent to
>>> hardware box that is routing packets .)]. It's a school work..
>>> Question is: is possible write this kind of application in
>>> python?
>> Hmm.  It's going to be rather difficult, but you might be able
>> to.
>>
>>> and if it's, what module should i use? I tried search for some
>>> libpcap equivalent in python and found pylibpcap, but can't
>>> find documentation and tutorial.
>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.
>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>>
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>>
>>
> And note that this won't work on Vista, where the raw socket interface
> is no longer available to standard applications.
> 
> regards
>  Steve
> 


Thanks guys

I don't care about Vista. What i will (i hope only) need is a linux
system with two net devices running router,
XP hosts connected (not only two.. hubs, switches) and these hosts have
to ping via router.



From Scott.Daniels at Acm.Org  Tue Feb  3 18:42:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 15:42:21 -0800
Subject: Path question
In-Reply-To: <mailman.8716.1233686855.3487.python-list@python.org>
References: <mailman.8716.1233686855.3487.python-list@python.org>
Message-ID: <37WdnbcVOrtzSBXUnZ2dnUVZ_vninZ2d@pdx.net>

Geert Vancompernolle wrote:
> I have the following path construction: ...
> ./src/__init__.py
>     /main.py
>     /modules/__init__.py
>             /application.py
>     /ui/__init__.py
>        /mainwindow/__init__.py
>                   /mainwindow.py
> I want to call ... 'MainWindow' in module 'mainwindow', from 'application'.

> I'm having the following import statement in 'applications.py':
> from .. ui.mainwindow.mainwindow import MainWindow


If you run the application with the command:
     python -m src.modules.application ...
rather than
     python src/modules/application.py ...
your import should work.
You need to make the package layering to application explicit.
Similarly, you can start Idle with:
     python -m idlelib.idle ...

--Scott David Daniels
Scott.Daniels at Acm.Org


From rhodri at wildebst.demon.co.uk  Tue Feb  3 19:05:24 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 00:05:24 -0000
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uosvvagba8ncjz@gnudebst>

On Tue, 03 Feb 2009 08:45:23 -0000, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> wrote:

> I find this extreme position is rather incoherent. If I may paraphrase
> the argument as I see it:

> "Enforced data hiding is useless, because it is utterly trivial to bypass
> it, AND it's wicked, because it makes it unbelievably painful and
> difficult to bypass it when you need to."

> If it is trivial to bypass, surely it can't be that painful to bypass?

I think you haven't noticed which of the parties is shifting their ground.
I'm very much of the second opinion; it was Russ who did the sudden volte
face and declared that it was trivial to circumvent.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Tue Feb  3 19:14:23 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 00:14:23 -0000
Subject: is python Object oriented??
In-Reply-To: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
Message-ID: <op.uosv99j3a8ncjz@gnudebst>

On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 2, 7:48?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com>  
>> wrote:
>> > Here we go again. If you have access to the source code (as you nearly
>> > always do with Python code), then "breaking the language-enforced data
>> > hiding" is a trivial matter of deleting the word "private" (or
>> > equivalent).
>>
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
>
> If a library developer releases the source code of a library, any user
> can trivially "defeat" the access restrictions. But if a team of
> developers is checking in code for a project, the leader(s) of the
> project can insist that the access restrictions be respected to
> simplify the management of interfaces. The larger the team, the more
> useful that can be. That's why Java, C++, Ada, Scala, and other
> languages have a "private" keyword.

Indeed he can.  He can even do that in Python; it just requires a little
self-discipline from the team, or a validation script on the code
repository if he really doesn't trust them.  Not only can this be done
without forcing the rest of the world to play, it makes things a little
less daunting when those nice clean interfaces turn out to be
incomplete/too slow/not what you thought.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From defaultuserbr at yahoo.com  Tue Feb  3 19:23:00 2009
From: defaultuserbr at yahoo.com (Default User)
Date: 4 Feb 2009 00:23:00 GMT
Subject: function call overhead
References: <ln6v6lu2nb.fsf@nuthaus.mib.org>
	<c710ceab-c6c3-4437-bdab-f95e3ac3002b@b38g2000prf.googlegroups.com>
Message-ID: <6us5f4Fh659sU1@mid.individual.net>


The original message in this thread was posted with the intent to
disrupt comp.lang.c by setting follow-ups there. Please either ignore
this thread or change the distribution. Thanks, and sorry our troll has
caused problems in your group.




Brian


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb  3 19:51:46 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 00:51:46 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
Message-ID: <pan.2009.02.04.00.51.47@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 10:20:28 +0100, Thorsten Kampe wrote:


>> If a "private" keyword (or equivalent) were available, then the change
>> would need to be made in only one location rather than at every
>> occurrence off the identifier. That is much less error prone. Sure, you
>> can argue (as I'm sure someone will) that the users of the library
>> should be more careful. Yes they should, but why not let the language
>> help with such low-level details. That's what high-level languages are
>> for.
> 
> This scenario is highly "supposing" and doesn't look like a real-world-
> case to me.

You think that private attributes never become public?

Encoding a "private" flag in the name is a violation of Once And Only 
Once. Although the OAOO principle is generally referred to when 
discussing code, it is more generic and applies to other things as well. 
You should be able to state an attribute is private *once*, not every 
time you use it.

http://c2.com/cgi/wiki?OnceAndOnlyOnce

On the other hand, encoding that private flag in the name is a variation 
of *sensible* Hungarian Notation, as used by the Microsoft Apps team, not 
the stupid version used by the Windows team.

http://www.joelonsoftware.com/articles/Wrong.html

So that's a point in its favour.



> But anyway: the obvious solution in my humble opinion would
> be to do something like "public_attribute = _private_attribute". But
> that would be too simple, too "unjavaesque", right?!

No, it would be too *faulty*. It simply doesn't work. Consider:

class Parrot(object):
    _count = 0
    def foo(self):
        print 'foo'
        self._count += 1
    def bar(self):
        print "You have called foo %d times" % self._count


This works as expected:

>>> p = Parrot()
>>> p.foo()
foo
>>> p.foo()
foo
>>> p.bar()
You have called foo 2 times


Now you promote count from private to public, using your "obvious 
solution", and try to use it:


class Parrot(object):
    _count = 0
    count = _count
    def foo(self):
        print 'foo'
        self._count += 1
    def bar(self):
        print "You have called foo %d times" % self._count



>>> p = Parrot()
>>> p.foo()
foo
>>> p.count = 99
>>> p.bar()
You have called foo 1 times


Clearly the "obvious" solution simply isn't sufficient to get the result 
that you need. One solution is to just refactor the source code, so that 
the attribute identifier "_count" becomes "count", but beware of all the 
usual issues with source code refactoring.

Another solution is to leave _count as it is, and create a *property* 
called count, not a simple attribute:

count = property(
    lambda self: self._count, 
    lambda self, x: setattr(self, '_count', x),
    None,
    "Public interface to private attribute _count"
    )


but this adds complexity to the class and will be a maintenance headache 
as the class' methods diverge into those that manipulate self._count 
directly and other methods which manipulate self.count.



-- 
Steven


From demirbaris at gmail.com  Tue Feb  3 19:57:37 2009
From: demirbaris at gmail.com (Baris Demir)
Date: Wed, 04 Feb 2009 01:57:37 +0100
Subject: function scope
In-Reply-To: <0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>
References: <mailman.8654.1233618041.3487.python-list@python.org>	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
	<0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>
Message-ID: <4988E801.7050705@gmail.com>

Tim Roberts wrote:
> Mike Kent <mrmakent at cox.net> wrote:
>   
>> On Feb 2, 6:40 pm, Baris Demir <demirba... at gmail.com> wrote:
>>
>>     
>>> def simpleCut(d=dict()):
>>>        temp=d
>>>        for i in temp.keys():
>>>            if    (temp[i] == .......) :
>>>               temp[i]=new_value
>>> return temp
>>>       
>> You have been bitten by the shared default parameter noobie trap:
>> http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects
>>     
>
> Actually, he hasn't.  His problem is more fundamental.
>
> However, this is still a good thing for you to point out now and then.
>   

Thanks a lot for the replies guys. They all helped a lot. And, I guess, 
I should read a lot more about python, it is not as simple as it seems 
at the beginning, or for the beginners:)
cheers
BD



From cournape at gmail.com  Tue Feb  3 20:03:57 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 10:03:57 +0900
Subject: is python Object oriented??
In-Reply-To: <dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<mailman.8710.1233684330.3487.python-list@python.org>
	<dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>
Message-ID: <5b8d13220902031703r15a32435j27f90fabde147e25@mail.gmail.com>

On Wed, Feb 4, 2009 at 4:10 AM,  <thmpsn.m.k at gmail.com> wrote:

>
> What limitations? The only limitations I see are the ones associated
> with opaque types (what you mentioned above).

Opaque type are used in C++ as well, for data hiding - if
private/public were that great for data hiding, the PIMPL idiom would
not be used. That's the limitation I am talking about. Granted, it is
relatively specific to C++, which use the C headers mechanism for API
declaration.

David


From Russ.Paielli at gmail.com  Tue Feb  3 20:13:32 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 17:13:32 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
Message-ID: <4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>

On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 08:45:23 -0000, Steven D'Aprano
>
> <ste... at remove.this.cybersource.com.au> wrote:
> > I find this extreme position is rather incoherent. If I may paraphrase
> > the argument as I see it:
> > "Enforced data hiding is useless, because it is utterly trivial to bypass
> > it, AND it's wicked, because it makes it unbelievably painful and
> > difficult to bypass it when you need to."
> > If it is trivial to bypass, surely it can't be that painful to bypass?
>
> I think you haven't noticed which of the parties is shifting their ground.
> I'm very much of the second opinion; it was Russ who did the sudden volte
> face and declared that it was trivial to circumvent.

Whoa! Hold on a minute here. Your failure to understand a simple idea
does not constitute a "sudden volte" (whatever that is) on my part.

Let me try to explain again what should be fairly obvious.

If the user of the library has the source code (and the right to
modify it), disabling access restrictions is trivial. You simply
delete the "private" keyword (or equivalent) wherever necessary.

If you are working with a team, however, you cannot just do that
unilaterally unless you have the authority to do so. In other words,
you may be required to conform to the APIs established by the team. In
that case, disabling access restrictions may not be impossible (or
even difficult), but it is no longer trivial.


From rdmurray at bitdance.com  Tue Feb  3 20:25:05 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 01:25:05 +0000 (UTC)
Subject: global variable confusion
References: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
Message-ID: <gmaqph$psk$1@ger.gmane.org>

"Robert D.M. Smith" <robert.dm.smith at gmail.com> wrote:
> I have a question on global variables and how to use them.  I have 2 files;
> a.py & b.py
> 
> # a.py -----
> 
> myvar = { 'test' : '123' }
> 
> # -------
> # b.py -----
> 
> from a import myvar
> 
> def test():
>      a.myvar = { 'blah' : '456' }
> 
> # -----
> 
> If I *'import a*' & type *'a.myvar'* it prints 'test' & '123'.
> 
> Now, if I *'import b'* & type *'b.test()'* ... does this actually change the
> contents of myvar? It seems I have to do *'print b.myvar'* to see the change
> but really I want to just simply do* 'print myvar'*. I want to be able to
> change myvar anywhere. Please help me grasp this concept.

As someone else told you the code above won't work, because you haven't
imported the 'a' that your 'test' function references.  But let's
ignore that issue.

I'm guessing the confusion you are experiencing is arising from the 
concept of name spaces (a very powerful and ubiquitous concept in Python).
A namespace maps an identifier to a object.  A given identifier exists in
exactly one namespace, but many identifiers can refer to the same object.

When you do 'from a import myvar', you are setting the identifier 'myvar' 
_in the current model's global namespace_ to point to the same object that
'myvar' does in module a.  If, in the current module, you then do, say,
'myvar = 1', what you've done is _rebound_ the identifier 'myvar' in the
current module's global namespace to the integer 1 (an integer object).
You haven't affected anything in module 'a'.

If, on the other hand, you do 'import a', what you've done is bound the
global namespace of module 'a' (an object) to the identifier 'a' in the
current module's global namespace.  If you were to do 'a = 1' in the
current module, then you'd rebind the identifier 'a' to the integer 1.
After that a.myvar would be an error.

If, however, you say 'a.myvar = 1', what you've done is rebound the
identifier 'myvar' _in module a's global namespace_ to the integer 1.  
Anything that subsequently references a.myvar is going to get '1' as
the result.

Now, to take your brain around the final bend, think about what happens 
if one module does 'from a import myvar', and module imported later does 
'import a; a.myvar = 1'.  The first module bound its global identifier
'myvar' to the object a.myvar originally pointed to (a little dictionary
in your example above).  The second module rebinds the identifier myvar in 
module a's global namespace to the integer 1.  But that doesn't affect
the first module's global namespace.  There, the identifier 'myvar'
is still bound _to the original dictionary_.

A modification of your example should make what is going on clearer:

    ---------------------------
    # a.py
    myvar = {'test': '123'}
    ---------------------------
    # b.py
    from a import myvar
    myvar['test'] = '456'
    ---------------------------

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13)
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from a import myvar
    >>> print myvar
    {'test': '123'}
    >>> import b
    >>> print myvar
    {'test': '456'}

The difference between the above and doing 'myvar = 1' is that in the
above code the statement 'myvar['test'] = '456' modifies _the object
that myvar points to_, while 'myvar = 1' modifies _what_ myvar points to.

Study that last sentence until you understand it, and a lot of things
that happen in Python will be much clearer to you (such as what
happens when you pass arguments to a function or method!)

If what I have written doesn't make sense, feel free to ask more 
questions.

--RDM



From Russ.Paielli at gmail.com  Tue Feb  3 20:28:58 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 17:28:58 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
Message-ID: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>

On Feb 3, 4:14 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com>
> >> wrote:
> >> > Here we go again. If you have access to the source code (as you nearly
> >> > always do with Python code), then "breaking the language-enforced data
> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> > equivalent).
>
> >> If it's that trivial to defeat something that its proponents appear to
> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> of using "private" in the first place?
>
> > If a library developer releases the source code of a library, any user
> > can trivially "defeat" the access restrictions. But if a team of
> > developers is checking in code for a project, the leader(s) of the
> > project can insist that the access restrictions be respected to
> > simplify the management of interfaces. The larger the team, the more
> > useful that can be. That's why Java, C++, Ada, Scala, and other
> > languages have a "private" keyword.
>
> Indeed he can.  He can even do that in Python; it just requires a little
> self-discipline from the team, or a validation script on the code
> repository if he really doesn't trust them.  Not only can this be done
> without forcing the rest of the world to play, it makes things a little
> less daunting when those nice clean interfaces turn out to be
> incomplete/too slow/not what you thought.

This has already been refuted several times on this thread alone, so I
will not bother doing it again.



From davidgould at davidgould.com  Tue Feb  3 20:46:57 2009
From: davidgould at davidgould.com (davidgould at davidgould.com)
Date: Tue, 3 Feb 2009 17:46:57 -0800 (PST)
Subject: Passing environment variable to "subprocess" causes failure
Message-ID: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>

I'm attempting to run subprocess and passing in an environment
variable. When I do this the child process fails with an error. When I
don't pass an environement variable it runs fine.

BTW Running this code under Windows XP with Python 2.6.1

Code A:

p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
Source' } )
print p.communicate()[0]
print p.returncode

Output:

None
-1072365564

Code B:

p = subprocess.Popen( ['python', '-V'] )
print p.communicate()[0]
print p.returncode

Output:

Python 2.6.1
0

Any idea why passing an environment variable causes it to fail?
Thanks.


From johnforse at talktalk.net  Tue Feb  3 20:58:43 2009
From: johnforse at talktalk.net (John Forse)
Date: Wed, 4 Feb 2009 01:58:43 +0000
Subject: v 3.0 mpkg
Message-ID: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>

  Does anyone know if Python v3.0 is available as an .mpkg installer  
for Mac 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't  
find any reference to one on the Python.org download site. I've  
downloaded the Python 3.0 folder but can't follow how to install it  
without a .mpkg file. Any help would be really appreciated.
Regards
John





From btaylordesign at gmail.com  Tue Feb  3 21:36:40 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 18:36:40 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
Message-ID: <e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>

On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
>
>
> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> > <btaylordes... at gmail.com> escribi?:
>
> > > I'm having an issue specifying the path for extracting files from
> > > a .zip archive. In my method, I have:
>
> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> > > What is happening is that the extract method is creating a folder with
> > > the name of 'zip_name' and extracting the files to it. Example:
>
> > extract will create all directories in member name. Use open instead:
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
> > ? ? ?shutil.copyfileobj(source, target)
>
> > (untested)
>
> > --
> > Gabriel Genellina
>
> Hi Gabriel,
>
> Thank you for the code sample. I figured I was going to have to use
> 'open', but I completely forgot about the 'with' statement. I was
> trying to figure out how to get access to the file object in the zip
> without having to loop over all of the items, and 'with' will allow me
> to do just that.
>
> I'll give it a shot when I get home this evening and post my results.
>
> Kind regards,
> Brandon

Ok, the first thing I needed to do was add:

from __future__ import with_statement at the beginning of my file

but:

with zip_file.open(zip_name + '/' + thumbnail_image) as source:
                    with open(os.path.join(thumbnail_path,
thumbnail_image), 'wb') as target:
                        shutil.copyfileobj(source, target)

Returns an error on the first line:

ZipExtFile instance has no attribute '__exit__'

Googling this error message is turning up nothing, and there's no
mention of the exception in the docs. Any thoughts?

TIA,
Brandon


From google at mrabarnett.plus.com  Tue Feb  3 21:44:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 02:44:27 +0000
Subject: Passing environment variable to "subprocess" causes failure
In-Reply-To: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
Message-ID: <4989010B.2050104@mrabarnett.plus.com>

davidgould at davidgould.com wrote:
 > I'm attempting to run subprocess and passing in an environment
 > variable. When I do this the child process fails with an error. When I
 > don't pass an environement variable it runs fine.
 >
 > BTW Running this code under Windows XP with Python 2.6.1
 >
 > Code A:
 >
 > p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
 > Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
 > Source' } )
 > print p.communicate()[0]
 > print p.returncode
 >
 > Output:
 >
 > None
 > -1072365564
 >
 > Code B:
 >
 > p = subprocess.Popen( ['python', '-V'] )
 > print p.communicate()[0]
 > print p.returncode
 >
 > Output:
 >
 > Python 2.6.1
 > 0
 >
 > Any idea why passing an environment variable causes it to fail?
 > Thanks.
 >
Are you sure it's not the path within the dict you're passing that's wrong?


From google at mrabarnett.plus.com  Tue Feb  3 21:53:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 02:53:30 +0000
Subject: Extracting file from zip archive in Python 2.6.1
In-Reply-To: <e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>	<mailman.8695.1233675948.3487.python-list@python.org>	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <4989032A.1010200@mrabarnett.plus.com>

Brandon Taylor wrote:
 > On Feb 3, 1:16 pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
 >> On Feb 3, 9:45 am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
 >>
 >>
 >>
 >>> En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor
 >>> <btaylordes... at gmail.com> escribi?:
 >>>> I'm having an issue specifying the path for extracting files from
 >>>> a .zip archive. In my method, I have:
 >>>> zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
 >>>> What is happening is that the extract method is creating a folder with
 >>>> the name of 'zip_name' and extracting the files to it. Example:
 >>> extract will create all directories in member name. Use open instead:
 >>> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
 >>>    with open(os.path.join(thumbnail_path, thumbnail_image), "wb") 
as target:
 >>>      shutil.copyfileobj(source, target)
 >>> (untested)
 >>> --
 >>> Gabriel Genellina
 >> Hi Gabriel,
 >>
 >> Thank you for the code sample. I figured I was going to have to use
 >> 'open', but I completely forgot about the 'with' statement. I was
 >> trying to figure out how to get access to the file object in the zip
 >> without having to loop over all of the items, and 'with' will allow me
 >> to do just that.
 >>
 >> I'll give it a shot when I get home this evening and post my results.
 >>
 >> Kind regards,
 >> Brandon
 >
 > Ok, the first thing I needed to do was add:
 >
 > from __future__ import with_statement at the beginning of my file
 >
 > but:
 >
 > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
 >                     with open(os.path.join(thumbnail_path,
 > thumbnail_image), 'wb') as target:
 >                         shutil.copyfileobj(source, target)
 >
 > Returns an error on the first line:
 >
 > ZipExtFile instance has no attribute '__exit__'
 >
 > Googling this error message is turning up nothing, and there's no
 > mention of the exception in the docs. Any thoughts?
 >
The 'with' statement relies on the object having __enter__ and __exit__
methods. It looks like the object returned by zip_file.open() doesn't
have them.


From raykyoto at gmail.com  Tue Feb  3 21:53:53 2009
From: raykyoto at gmail.com (Ray)
Date: Tue, 3 Feb 2009 18:53:53 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com> 
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
Message-ID: <5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>


Hi Lie,


On Feb 3, 7:21?pm, Lie <Lie.1... at gmail.com> wrote:
> On Feb 3, 1:37?pm, Ray <rayky... at gmail.com> wrote:
>
> > I'll enclose the top-level commands with the if statement above...its
> > just a minor change, but it seems unavoidable.
>
> > Thanks again!
>
> > Ray
>
> If you really don't want the file to be changed, you could (depends on
> the module) use the module as a subprocess. The ideal solution is for
> the module to have an if __name__ == '__main__': to determine whether
> it is being used as a module or a standalone program though.


Thank you for this!  I've done the "if __name__ ..." as you and others
suggested.  It isn't what I would have liked, but I'm ok with
it...especially after finding out that top-level code has to be run
while importing.  As I'm new to python, I didn't know about that, but
I now see there's no way around it.

So, is inserting the above if statement common practice for python
programmers?  As a C programmer, it seems that people put a "#ifndef
XXX...#define XXX...[all of the code]...#endif" almost as a habit.  I
wonder if its the same thing?

Thank you!

Ray



From rdmurray at bitdance.com  Tue Feb  3 22:08:31 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 03:08:31 +0000 (UTC)
Subject: Passing environment variable to "subprocess" causes failure
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
	<4989010B.2050104@mrabarnett.plus.com>
Message-ID: <gmb0re$633$1@ger.gmane.org>

Quoth MRAB <google at mrabarnett.plus.com>:
> davidgould at davidgould.com wrote:
>  > I'm attempting to run subprocess and passing in an environment
>  > variable. When I do this the child process fails with an error. When I
>  > don't pass an environement variable it runs fine.
>  >
>  > BTW Running this code under Windows XP with Python 2.6.1
>  >
>  > Code A:
>  >
>  > p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
>  > Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
>  > Source' } )
>  > print p.communicate()[0]
>  > print p.returncode
>  >
>  > Output:
>  >
>  > None
>  > -1072365564
>  >
>  > Code B:
>  >
>  > p = subprocess.Popen( ['python', '-V'] )
>  > print p.communicate()[0]
>  > print p.returncode
>  >
>  > Output:
>  >
>  > Python 2.6.1
>  > 0
>  >
>  > Any idea why passing an environment variable causes it to fail?
>  > Thanks.
>  >
> Are you sure it's not the path within the dict you're passing that's wrong?

Or there's something missing from the environment that python needs,
causing a non-zero return code when it is missing.  (That seems odd,
though.)

You ought to print communiicate()[1] to see if there is an
accompanying error message that would shed light on the problem.

--RDM



From rdmurray at bitdance.com  Tue Feb  3 22:15:18 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 03:15:18 +0000 (UTC)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <gmb186$6s3$1@ger.gmane.org>

Quoth Brandon Taylor <btaylordesign at gmail.com>:
> Ok, the first thing I needed to do was add:
> 
> from __future__ import with_statement at the beginning of my file
> 
> but:
> 
> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>                     with open(os.path.join(thumbnail_path,
> thumbnail_image), 'wb') as target:
>                         shutil.copyfileobj(source, target)
> 
> Returns an error on the first line:
> 
> ZipExtFile instance has no attribute '__exit__'
> 
> Googling this error message is turning up nothing, and there's no
> mention of the exception in the docs. Any thoughts?

Yeah, that means the ZipExtFile object hasn't been extended to
handle the context management protocol.  It would be pretty
simple to roll your own for it.  Take a look at the contextlib
module.

--RDM



From miki.tebeka at gmail.com  Tue Feb  3 22:34:15 2009
From: miki.tebeka at gmail.com (Miki)
Date: Tue, 3 Feb 2009 19:34:15 -0800 (PST)
Subject: Passing environment variable to "subprocess" causes failure
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
Message-ID: <ebde93e8-f0e8-4bc2-8fb5-9b071734b473@y1g2000pra.googlegroups.com>


> Code A:
>
> p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
> Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
> Source' } )
> print p.communicate()[0]
> print p.returncode
>
> Output:
>
> None
> -1072365564
My *guess* is that since PATH is not in the environment you're
passing, the shell can't find the python interpreter.
Try:
from os import environ
from subprocess import Popen, PIPE
env = environ.copy()
# Warning: override existing PYTHONPATH
env["PYTHONPATH"] = "C:/Documents and Settings/David Gould/workspace/
DgTools/Common/Trunk/Source"
p = = subprocess.Popen(['python', '-V'], env=env, stdout=PIPE)
print p.communicate()
print p.returncode

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From miki.tebeka at gmail.com  Tue Feb  3 22:39:29 2009
From: miki.tebeka at gmail.com (Miki)
Date: Tue, 3 Feb 2009 19:39:29 -0800 (PST)
Subject: Cross platform compilation?
References: <mailman.8731.1233699257.3487.python-list@python.org>
Message-ID: <4a4b0708-9502-4c49-8612-98ab8b6417e3@r15g2000prh.googlegroups.com>

On Feb 2, 6:59?pm, "John Harper" <j... at john-a-harper.com> wrote:
> I am trying to build Python to use in an embedded system which uses a
> ppc_440 CPU. The only information I've found is something written by
> Klaus Reimer a few years ago, which was based on Python 2.2. So far I
> seem to have successfully built Python itself, but building the
> extensions fails miserably with complaints about library format. It
> insists on referring to "i686" which is indeed the platform it is
> actually running on.
>
> Before I try to reverse engineer completely setup.py, is there
> something obvious that needs to be done to get it to use the right tool
> chain?
>
> More generally, it seems like this would be something that lots of
> people would want to do. I'm surprised there isn't support for it built
> into the distributed version of Python, without having to hack all the
> setup files...?
Maybe http://www.ailis.de/~k/archives/19-ARM-cross-compiling-howto.html
could help?

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com



From rhodri at wildebst.demon.co.uk  Tue Feb  3 22:49:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 03:49:08 -0000
Subject: is python Object oriented??
In-Reply-To: <4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
Message-ID: <op.uos576o0a8ncjz@gnudebst>

On Wed, 04 Feb 2009 01:13:32 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> I'm very much of the second opinion; it was Russ who did the sudden  
>> volte
>> face and declared that it was trivial to circumvent.
>
> Whoa! Hold on a minute here. Your failure to understand a simple idea
> does not constitute a "sudden volte" (whatever that is) on my part.

My apologies.  "Volte-face" should have had a hyphen in it.

> Let me try to explain again what should be fairly obvious.

I understood you just fine.  It was how what you described was
consistent with your previous position that "private" was needed
for enforcement purposes, while the leading underscore convention
relied on team discipline and was therefore insufficient.  Since
you've clarified that "private" enforces privacy through... er...
team discipline, I'm now just very confused as to what you think
it buys you.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From btaylordesign at gmail.com  Tue Feb  3 22:56:32 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 19:56:32 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com> 
	<mailman.8750.1233717333.3487.python-list@python.org>
Message-ID: <4b188330-0328-48c3-a072-041273055fb8@r24g2000vbp.googlegroups.com>

On Feb 3, 9:15?pm, rdmur... at bitdance.com wrote:
> Quoth Brandon Taylor <btaylordes... at gmail.com>:
>
>
>
> > Ok, the first thing I needed to do was add:
>
> > from __future__ import with_statement at the beginning of my file
>
> > but:
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ? ? ? ? ? ? ? ? ? with open(os.path.join(thumbnail_path,
> > thumbnail_image), 'wb') as target:
> > ? ? ? ? ? ? ? ? ? ? ? ? shutil.copyfileobj(source, target)
>
> > Returns an error on the first line:
>
> > ZipExtFile instance has no attribute '__exit__'
>
> > Googling this error message is turning up nothing, and there's no
> > mention of the exception in the docs. Any thoughts?
>
> Yeah, that means the ZipExtFile object hasn't been extended to
> handle the context management protocol. ?It would be pretty
> simple to roll your own for it. ?Take a look at the contextlib
> module.
>
> --RDM

Cool. Thanks for the pointers. In the meantime, I just used extract
and os.rename to move the files where I need them, but I'll see if I
can save that extra step if possible.


From haag at lsu.edu  Tue Feb  3 23:02:13 2009
From: haag at lsu.edu (Alaric Haag)
Date: Tue, 03 Feb 2009 22:02:13 -0600
Subject: Good or bad use of __repr__?
Message-ID: <haag-0CE93B.22021303022009@news.gmane.org>

Hello,

Is the use of __repr__ below a "really bad idea"? 

class Dimension():
    def __init__(self, setp, name):
        ptr = setp.contents.dim
        while ptr.contents.name != name:
            ptr = ptr.contents.next
        self.name = ptr.contents.name
        self.size = ptr.contents.size
        self.unlimited = bool(ptr.contents.unlimited)
        self.coord = ptr.contents.coord
    def __repr__(self):
        return '%g' % (self.size)

As written, if a program references a Dimension instance without an 
attribute, it gets the size attrbute "by default". If it wants the other 
attributes, they have to be spec'd. In the context of the code being 
developed, the "size" attribute is the "logical" representation of the 
dimension. I'm just wondering if this sort of design should be avoided.

Many thanks!

Alaric



From apt.shansen at gmail.com  Tue Feb  3 23:08:34 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 20:08:34 -0800
Subject: Import without executing module
In-Reply-To: <5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
Message-ID: <7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>

On Tue, Feb 3, 2009
> So, is inserting the above if statement common practice for python
> programmers?  As a C programmer, it seems that people put a "#ifndef
> XXX...#define XXX...[all of the code]...#endif" almost as a habit.  I
> wonder if its the same thing?

That statement is very common in Python. If a module is only ever
going to be run as the main script its not needed but as you saw with
this thread, sometimes you want to import what would be main into
other places. More commonly I've found, is the use of that statement
in other modules that are never -really- meant to be main but
sometimes you want to run on their for testing or other purposes. For
me, I use it all the time in my GUI modules that are never in the
normal course of events run directly, but when developing them its
useful to quickly start up a fake app / frame and load what I'm
working on into a test display.

That said, its use is fairly unique and idiomatic just as the 'main
entry point' of a module. 75%(a number I'm pulling outta my arse!) of
its uses are things like:
    if __name__ == "__main__":
        main()

Or whatever other minimal scaffolding is required to jumpstart the
script's driver functions. Its unlikely you'll see anything like it
elsewhere -- and it serves a very different purpose from what you
describe seeing in C. There is no need to try to make sure something
is executed/compiled only once in Python like you may want to do in C.
Every module is only ever compiled once: if you import it ten times in
ten different places only the first will compile and execute the code,
the rest of the calls will return that original module again.

You're only likely to see "if" statements around definitions and
larger blocks of top-level code if someone is doing something...
complicated. Or if they're doing a big procedural script that's not
really ever meant to be re-used (especially one that grows overtime
and takes a life of its own). It happens but its really rare, from my
experience at least.

--S


From apt.shansen at gmail.com  Tue Feb  3 23:23:40 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 20:23:40 -0800
Subject: Good or bad use of __repr__?
In-Reply-To: <haag-0CE93B.22021303022009@news.gmane.org>
References: <haag-0CE93B.22021303022009@news.gmane.org>
Message-ID: <7a9c25c20902032023j37e719d7j6246e54cd50af37a@mail.gmail.com>

>
> As written, if a program references a Dimension instance without an
> attribute, it gets the size attrbute "by default". If it wants the other
> attributes, they have to be spec'd. In the context of the code being
> developed, the "size" attribute is the "logical" representation of the
> dimension. I'm just wondering if this sort of design should be avoided.

Well the question is: does that repr give you sufficient information
to identify at least and possibly recreate that instance?

If you repr an int and it comes up as 50.. and repr a Dimension and it
comes up as 50, does that allow you to differentiate between them? If
you need to. I primarily use repr for a debugging tool, and in that
context I'd always for instances at least make it something like
<Dimension(size=50)> as the repr output. But I personally like to err
on the side of 'more is better' when it comes to repr output, and
would probably have put in the name/unlimited/coord even if they may
not always be present. So that if you're checking something after the
fact and all you have to go on is a repr of an object involved you
have more details to work with.

But there's no hard and fast rules. Generally, repr output should be
whatever you need to clearly reflect The Specific Object as a string.

--S


From Bornstub at gmail.com  Tue Feb  3 23:37:02 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Tue, 3 Feb 2009 20:37:02 -0800 (PST)
Subject: How to call python from a foreign language thread (C++)
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<mailman.8715.1233686654.3487.python-list@python.org>
Message-ID: <a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>

On 2?4?, ??2?44?, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Feb 3, 2009, at 12:51 PM, Victor Lin wrote:
>
>
>
> > It seems that my program can't call to Python's function from thread
> > directly, because there is Global Interpreter Lock. The python's GIL
> > is so complex, I have no idea how it works. I'm sorry, what I can do
> > is to ask. My question is. What should I do before and after I call a
> > Python function from threads?
>
> Hi Victor,
> I asked a similar question yesterday and have gotten no response yet  
> -- I hope you'll have better luck. I'm writing a C extension that  
> wants to implement a callback in a new thread. Here's what I think  
> I've learned from reading the threads API doc. Please note that this  
> is a classic case of the blind leading the blind! I'm sure some (most?  
> all?) of the ideas below are wrong, but I'm hoping that thinking  
> through some of this "out loud" will help both of us. Or maybe some  
> more knowledgeable person will take pity on/be appalled by my  
> ignorance and come to our rescue. =)
>
> Python's infamous GIL doesn't exist when a program is single-threaded.  
> Before a new thread is created, the main thread must call  
> PyEval_InitThreads() to create the GIL. However, "It is not safe to  
> call this function when it is unknown which thread (if any) currently  
> has the global interpreter lock." Therefore my extension must do this:
>
> i_have_the_gil = 0;
> if (!PyEval_ThreadsInitialized()) {
>     PyEval_InitThreads();
>     /* "...when this function initializes the lock, it also acquires  
> it." */
>     i_have_the_gil = 1;
>
> }
>
> That ensures that the GIL is created.
>
> My extension will be calling from a newly-created C thread. The  
> *Python* thread doesn't exist yet; so next I have to create it.  
> Therefore --
>
> if (!i_have_the_gil)
>     PyEval_AcquireLock();
>
> // Might not actually be the main thread but conceptually
> // it is OK to assume so here.
> main_thread = PyThreadState_Get();
>
> callback_thread = PyThreadState_New(main_thread->interp);
>
> PyThreadState_Swap(callback_thread);
>
> gstate = PyGILState_Ensure();
>
> call_callback_function();
>
> // Now unwind the above
>
> PyGILState_Release(gstate);
>
> PyThreadState_Swap(main_thread);
>
> PyThreadState_Clear(callback_thread);
>
> PyThreadState_Delete(callback_thread);
>
> PyEval_ReleaseLock();
>
> I haven't yet tested this! But hopefully it is the right idea and just  
> needs a little fine tuning.
>
> I found this discussion useful:http://mail.python.org/pipermail/python-list/2006-November/413088.html
>
> It includes the quote, "The current thread state API doc, as you read  
> it from top to bottom now, is in fact totally confusing for anyone who  
> didn't develop Python himself"
>
> I like! =)
>
> Cheers
> Philip
Hi Philip,

It does not work. But however, thanks your help. I have tired so many
methods to do. But it
crash...crash..deadlock...deadlock..crash...crash... I have no any
tried success. I am going crazy. Could someone help me, thanks.


From Russ.Paielli at gmail.com  Wed Feb  4 00:04:30 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 21:04:30 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
Message-ID: <11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>

On Feb 3, 7:49?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Wed, 04 Feb 2009 01:13:32 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> I'm very much of the second opinion; it was Russ who did the sudden ?
> >> volte
> >> face and declared that it was trivial to circumvent.
>
> > Whoa! Hold on a minute here. Your failure to understand a simple idea
> > does not constitute a "sudden volte" (whatever that is) on my part.
>
> My apologies. ?"Volte-face" should have had a hyphen in it.
>
> > Let me try to explain again what should be fairly obvious.
>
> I understood you just fine. ?It was how what you described was
> consistent with your previous position that "private" was needed
> for enforcement purposes, while the leading underscore convention
> relied on team discipline and was therefore insufficient. ?Since
> you've clarified that "private" enforces privacy through... er...
> team discipline, I'm now just very confused as to what you think
> it buys you.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

You need team discipline either way. The question here is to what
extent the language supports the discipline. If you are going to check
for access violations anyway with third-party tools or code reviews,
why not let the language do the job for you automatically (or at least
take a first cut at it)?

Imagine you own a company, and you decide to lease an office building.
Would you expect the office doors to have locks on them? Oh, you
would? Why? You mean you don't "trust" your co-workers? What are locks
but enforced access restriction?

What people like you are saying is that you don't need no stinkin'
locks because your co-workers are all "consenting adults" whom you
trust. Actually, you're saying even more than that. You're saying that
office doors never need locks, because everyone should trust their co-
workers. All you need is a "keep-out" sign on the door (leading
underscores). And you are presenting as evidence for your position the
fact that people occasionally get locked out of an office that they
need to get into.

I'm saying, fine, if you trust your co-workers, then keep the doors
unlocked, but please don't insist that office doors come without
locks. Yes, locks occasionally cause inconvenience, but they serve a
very useful purpose if used properly.



From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 00:18:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 05:18:29 GMT
Subject: Good or bad use of __repr__?
References: <mailman.8752.1233720145.3487.python-list@python.org>
Message-ID: <pan.2009.02.04.05.18.30@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 22:02:13 -0600, Alaric Haag wrote:

> Hello,
> 
> Is the use of __repr__ below a "really bad idea"?
> 
> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord
>     def __repr__(self):
>         return '%g' % (self.size)


As a rule of thumb, you should aim for:

eval( repr(obj) )

to recreate the obj. That's not always possible, but when possible, it is 
an ideal to aspire to. Given that, I'd recommend:

    def __repr__(self):
        return '%s(%s, %s)' % (
        self.__class__.__name__, self.ptr, self.name)
    def __str__(self):
        return "<dim=%g>" % self.size


except of course your class doesn't store ptr.


But looking at the code shown, I'm guessing you have bigger design 
problems than just what __repr__ should look like. I suggest you read 
this:

http://www.surfscranton.com/architecture/LawOfDemeter.htm


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 00:29:01 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 05:29:01 GMT
Subject: Good or bad use of __repr__?
References: <mailman.8752.1233720145.3487.python-list@python.org>
	<pan.2009.02.04.05.18.30@REMOVE.THIS.cybersource.com.au>
Message-ID: <pan.2009.02.04.05.28.58@REMOVE.THIS.cybersource.com.au>

On Wed, 04 Feb 2009 05:18:29 +0000, Steven D'Aprano wrote:

> ... I'd recommend:
> 
>     def __repr__(self):
>         return '%s(%s, %s)' % (
>         self.__class__.__name__, self.ptr, self.name)
>     def __str__(self):
>         return "<dim=%g>" % self.size
> 
> 
> except of course your class doesn't store ptr.

Ah crap, sorry, I meant setp not ptr. Sorry for the confusion.



-- 
Steven


From tjreedy at udel.edu  Wed Feb  4 00:54:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 00:54:19 -0500
Subject: Good or bad use of __repr__?
In-Reply-To: <haag-0CE93B.22021303022009@news.gmane.org>
References: <haag-0CE93B.22021303022009@news.gmane.org>
Message-ID: <gmbai8$oo8$1@ger.gmane.org>

Alaric Haag wrote:
> Hello,
> 
> Is the use of __repr__ below a "really bad idea"? 
> 
> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord
>     def __repr__(self):
>         return '%g' % (self.size)
> 
> As written, if a program references a Dimension instance without an 
> attribute, it gets the size attrbute "by default".

No it does not.  It gets a string representation of the size.  Not the 
same thing.



From raykyoto at gmail.com  Wed Feb  4 00:56:04 2009
From: raykyoto at gmail.com (Ray)
Date: Tue, 3 Feb 2009 21:56:04 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com> 
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com> 
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com> 
	<mailman.8753.1233720522.3487.python-list@python.org>
Message-ID: <877a81a9-4f69-42d2-ab39-09ad7ca73c96@p2g2000prn.googlegroups.com>


Hi Stephen,


On Feb 4, 1:08?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Tue, Feb 3, 2009
>
> > So, is inserting the above if statement common practice for python
> > programmers? ?As a C programmer, it seems that people put a "#ifndef
> > XXX...#define XXX...[all of the code]...#endif" almost as a habit. ?I
> > wonder if its the same thing?
>
> That statement is very common in Python. If a module is only ever
> going to be run as the main script its not needed but as you saw with
> this thread, sometimes you want to import what would be main into
> other places. More commonly I've found, is the use of that statement
> in other modules that are never -really- meant to be main but
> sometimes you want to run on their for testing or other purposes. For

...

Oh, I see...I never thought of module testing as one possible uses of
it -- but yes, I see that now.  Makes sense to test each module
individually and (in C, at least) to write a separate main() driver in
another file each time...


> That said, its use is fairly unique and idiomatic just as the 'main
> entry point' of a module. 75%(a number I'm pulling outta my arse!) of
> its uses are things like:
> ? ? if __name__ == "__main__":
> ? ? ? ? main()
>
> Or whatever other minimal scaffolding is required to jumpstart the
> script's driver functions. Its unlikely you'll see anything like it
> elsewhere -- and it serves a very different purpose from what you
> describe seeing in C. There is no need to try to make sure something

...

Ah, ok!  I'm still trying to get use to how Python does things from
languages such as C...old habits [from other languages] are harder to
break.  :)  If the above "if" statement is fairly common, then I think
I'll start using it just to get into the habit of it.

Thank you very much for your detailed explanation!

Ray




From gagsl-py2 at yahoo.com.ar  Wed Feb  4 01:16:06 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 04:16:06 -0200
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <op.uotc04e4x6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 00:36:40 -0200, Brandon Taylor  
<btaylordesign at gmail.com> escribi?:
> On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
>> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
>> > <btaylordes... at gmail.com> escribi?:

>> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>> > > What is happening is that the extract method is creating a folder >  
>> > with
>> > > the name of 'zip_name' and extracting the files to it. Example:

>> > extract will create all directories in member name. Use open instead:
>> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as  
>> > target:
>> > ? ? ?shutil.copyfileobj(source, target)

> Ok, the first thing I needed to do was add:
>
> from __future__ import with_statement at the beginning of my file

That should not be necesary with your Python version (2.6.1 isn't it?)

> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>                     with open(os.path.join(thumbnail_path,
> thumbnail_image), 'wb') as target:
>                         shutil.copyfileobj(source, target)
>
> Returns an error on the first line:
>
> ZipExtFile instance has no attribute '__exit__'

Ouch, sorry, this new feature will appear in the not-yet-released 2.7  
version...
Try this instead:

source = zip_file.open(zip_name + '/' + thumbnail_image)
try:
   with open(os.path.join(thumbnail_path, thumbnail_image), 'wb') as target:
     shutil.copyfileobj(source, target)
finally:
   source.close()

-- 
Gabriel Genellina



From grante at visi.com  Wed Feb  4 01:30:37 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 04 Feb 2009 00:30:37 -0600
Subject: python libpcap equivalent
References: <mailman.8726.1233694063.3487.python-list@python.org>
	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<mailman.8735.1233700694.3487.python-list@python.org>
Message-ID: <vKudnRXE0d-QqxTUnZ2dnUVZ_jednZ2d@posted.usinternet>

On 2009-02-03, Steve Holden <steve at holdenweb.com> wrote:

>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.

FWIW, under Linux you can also capture packets using a raw-mode
socket, but the only times I've done it I was only capturing
packets for a single Ethertype (an Ethertype that I knew the OS
network stack was discarding).  I'm not sure if you can
configure a raw socket to intercept any and all packets such
that they don't get passed on to the network stack.

>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>> 
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>
> And note that this won't work on Vista, where the raw socket
> interface is no longer available to standard applications.

[I've few clues when it comes to Windows, but based on what I
overhear from the guys at work who do work on Windows
networking stuff, I suspect doing something like this on is
going to be an order of magnitude harder on Windows than on
Linux or BSD.]

Under Unices (and prehaps Windows), there are the tun/tap
interfaces, but they do pretty much the inverse of what the OP
wants to do.  TUN/TAP interfaces are an API between a
user-space app and the OSes network stack that allows the
user-space app to "pretend" to be an Ethernet interface in the
eyes of the OS.  What the OP want's is a corresponding API
between user-space and an Ethernet card's driver such that the
user-space app can pretend to be 

-- 
Grant



From sri_annauni at yahoo.co.in  Wed Feb  4 01:48:26 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 4 Feb 2009 12:18:26 +0530 (IST)
Subject: How do i add body to email.mime.multipart.MIMEMultipart instance?
Message-ID: <460283.85034.qm@web7904.mail.in.yahoo.com>

Hi,
Could someone tell me the way to add body to the instance email.mime.multipart.MIMEMultipart instance which has attachments?

Thanks,
Srini


      Bollywood news, movie reviews, film trailers and more! Go to http://in.movies.yahoo.com/


From sri_annauni at yahoo.co.in  Wed Feb  4 01:50:43 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 4 Feb 2009 12:20:43 +0530 (IST)
Subject: How do i add body to 'email.mime.multipart.MIMEMultipart' instance?
Message-ID: <944076.49060.qm@web7906.mail.in.yahoo.com>

Hi,
Could someone tell me the way to add body content to 'email.mime.multipart.MIMEMultipart' instance?

Thanks,
Srini


      Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/


From mail at microcorp.co.za  Wed Feb  4 01:54:35 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 4 Feb 2009 08:54:35 +0200
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <009b01c98695$712b9320$0d00a8c0@hendrik>

er  wrote:



>Simple question, I think: Is there a way to make a 
>completely global variable across a slew of modules?  
>If not, what is the canonical way to keep a global state?  
>The purpose of this is to try to prevent circular module 
>imports, which just sort of seems nasty.  Thank you!

Take a leaf out of COBOL's data division book,
and make a module that has all the globals in it.
Just refrain from calling it globals, that is the
path to insanity.
Then whenever you need the stuff, just 
import system_globals, and you are done.

This has another hidden advantage, in that the
system_globals.py can be used to keep all
sorts of system wide configuration information.

- Hendrik



From mail at microcorp.co.za  Wed Feb  4 02:09:04 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 4 Feb 2009 09:09:04 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de><mailman.8682.1233648428.3487.python-list@python.org>
	<Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>
Message-ID: <01a901c9869c$628e8fa0$0d00a8c0@hendrik>


"Scott David Daniels" <S...els at Acm.Org> wrote:

> You might enjoy looking at QNX, since I think it is built along the
> lines you are describing here.  I have an ancient copy of their OS,
> but haven't followed for more than couple of decades.

I vaguely know about it, and I know they claim to be hot on 
real time stuff.  I have never pursued it in any depth because
of the real tiny nature of the processors I have been working
with (8031).

When I had a cursory look at it a long time ago, it seemed
to be almost unix like in its make up, and I doubted that
I could persuade it to run on of them. (I may be dead 
wrong of course - I don't know)

I will put it on my list of stuff to try to get done.  

Thanks for the reminder.

- Hendrik




From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 02:10:26 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 07:10:26 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<498825f3$0$3303$426a74cc@news.free.fr>
Message-ID: <pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 12:09:46 +0100, Bruno Desthuilliers wrote:

>> I love Python, and I'm greedy and want it all: I want a dynamic,
>> easy-to- use language *and* a compiler that can protect me from myself
> 
> That's not what compilers are for.

So you say.

 
>> and bad data.
> 
> I definitly fail to see how a compiler could protect you from *runtime*
> issues ???

I'm surprised you can't. Any time a compiler prevents an error by 
detecting it at compile-time (say, attempting to store a 96-bit float 
into the memory space allocated for a 32-bit int), it has prevented a 
runtime error.

Perhaps what you are thinking is that I meant compilers can protect you 
from "all" runtime issues. That would be silly. Although, in principle, 
we can get close, for some definition of "close".


Here's a toy function, and a specification:

def inverse(x):
    return 1.0/x

Specification: input must be a float, output must be a float.

Is that function correct? No, because it will raise an exception if 
x==0.0. Python's compiler is dumb and will allow you to write incorrect 
functions, but a smart compiler could look at that function and see that 
it was incorrect. The fix would then be to change the code, or the 
specification, or both.

Smart compilers turn some runtime errors into compile-time errors. The 
earlier you catch the error, the easier it is to fix it.

Now, that's a toy example. Languages like Ada make correctness proofs, 
well, perhaps not easy, but merely difficult compared to impossible for 
languages like Python.

To bring it back to private/public attributes, side-effects make 
correctness proofs difficult. Modifications of attributes are side-
effects. When attributes are subject to being modified by arbitrary code, 
it is harder to reason about the correctness of the code:

class Inverter(object):
    def __init__(self, x):
        # Pre-condition: x is always a float
        if x:
            self.x = x
        else:
            raise ValueError("x must not be zero")
        # Post-condition: if self.x exists, it is a non-zero float
    def invert(self):
        return 1.0/self.x


Is method invert correct?

No, it is not, because the invariant that self.x is non-zero may have 
been broken by some arbitrary piece of code elsewhere. Our ability to 
reason about the correctness of the code is weakened significantly. 
Sticking an underscore in front of x does not help: there's nothing to 
stop some arbitrary function elsewhere changing _x to zero.

There are two usual approaches to dealing with that problem which are 
available to Python programmers:

(1) Paranoia. Make the developer responsible for checking everything all 
the time:

    def invert(self):
        x = self.x
        if isinstance(x, float) and x:
            return 1.0/self.x
        else:
            raise MyError('post-condition x a non-zero float violated')

You can use decorators to decrease the amount of boilerplate, but you 
have to remember to use the decorators; or you can use a metaclass to 
automatically apply decorators, but that's hard and not very flexible. 
Whichever way you do it, you're still responsible, and whatever way, you 
still have to pay the performance penalty.

This also turns an unexpected exception into an expected exception, but 
is otherwise rather useless. It doesn't tell you when the post-condition 
was violated, or by what function, and that's the information you need in 
order to fix the bug.



(2) Hope the error never occurs, and if it does, let the caller deal with 
it. Hopefully you aren't your own caller.

That's often the Python approach. I've already written about the glorious 
freedom such an approach gives the developer. I'm not being sarcastic: 
even if you are your own caller, you get to put off worrying about a bug 
which might never happen. This is a great strategy when the worst thing 
that a bug will do is display an icon in the wrong position. Fix it in 
the next release.

But that's not a viable strategy when the consequences of a bug might 
include giving the patient 20,000 rads of radiation instead of 200:

http://www.ccnr.org/fatal_dose.html


There is a third strategy, sadly not available to Python programmers: 
prevention by catching potential errors at compile-time. (Python does 
catch some errors at compile-time, but only syntax errors.) If x can only 
be modified in a few places, (that is, it is effectively hidden or 
private) then it is much easier to reason about program correctness, 
avoid bugs, and debug those bugs which do occur.

No, this is not a panacea which will prevent every imaginable bug. Nor is 
it a replacement for unit-testing (which also does not prevent every 
imaginable bug). It is a compliment to unit-testing.

Is it subject to over-use or misuse? Of course it is. So are properties, 
and decorators, and metaclasses, and OO, and Singletons, and, well, 
everything. Let's not close our eyes to *either* the costs or the 
benefits, and let's not limit what Python might become in the future. 
Python 3 has type annotations and Guido is encouraging people to 
experiment with type systems. This was unthinkable a year or two ago. 
What might Python 4000 bring?



-- 
Steven


From tpawley at gmail.com  Wed Feb  4 02:29:47 2009
From: tpawley at gmail.com (Torabisu)
Date: Tue, 3 Feb 2009 23:29:47 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <cc253e1c-e184-4c26-b227-50f119119649@r10g2000prf.googlegroups.com>

On Feb 1, 9:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?
> thanks
> from Peter (mcheun... at hotmail.com)

I use a combination of:

1. VI/VIM
2. Eclipse with PyDev extensions
3. NetBeans with Python Module installed

When I'm working directly on development boxes, making quick changes,
I'll use VI/VIM.  When I'm only doing Python / Django backend
development and working with Subversion I'll use Eclipse.  If I'm on a
project where I need to do Java ME work and Python / Django backend
development, then I'll use NetBeans.

My recommendation is try 3 or 4 and pick one that you feel comfortable
with.

Trav (",) T


From bob.martin at excite.com  Wed Feb  4 02:42:15 2009
From: bob.martin at excite.com (Bob Martin)
Date: Wed, 04 Feb 2009 07:42:15 GMT
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <rFbil.30038$Sp5.22112@text.news.virginmedia.com>

in 100686 20090203 181957 Catherine Heathcote <catherine.heathcote at gmail.com> wrote:
>Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>
>>> real programmers use ed.
>>
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>>
>
>You had teeth!?!
>
>Oh and hi, I shall be a new face in the crowd ;)

Oh dear!  You'd better tell them what they're in for ;-)


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 03:51:25 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 09:51:25 +0100
Subject: Good or bad use of __repr__?
In-Reply-To: <mailman.8752.1233720145.3487.python-list@python.org>
References: <mailman.8752.1233720145.3487.python-list@python.org>
Message-ID: <49895700$0$20332$426a34cc@news.free.fr>

Alaric Haag a ?crit :
> Hello,
> 
> Is the use of __repr__ below a "really bad idea"? 

I'd probably do the same as Stephen Hansen ("<Dimension(size=50)>") or 
at least something quite similar.


Now on a totally unrelated point (micro optimization anyone ?):

> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord

In the above code, you're constantly refering to ptr.contents, and never 
use ptr directly. Attribute lookup is not free, so it's better to avoid 
them. Local bindings lookup, OTHO, is quite fast. IOW, this would better 
be written as:

      def __init__(self, setp, name):
          contents = setp.contents.dim
          while contents.name != name:
              contents = contents.next
          self.name = contents.name
          self.size = contents.size
          self.unlimited = bool(contents.unlimited)
          self.coord = contents.coord



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:05:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:05:22 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8728.1233694656.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<mailman.8584.1233564941.3487.python-list@python.org>	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8728.1233694656.3487.python-list@python.org>
Message-ID: <49895a45$0$16900$426a74cc@news.free.fr>

Gabriel Genellina a ?crit :
> En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com> 
> escribi?:
> 
>> Suppose a library developer (or a module developer on a large team)
>> uses leading underscores. Now suppose that, for whatever reason
>> (pressure from the users, perhaps), the library developer decides to
>> change a "private" attribute to public. Now all occurrences of the
>> identifier need to be changed. If an assignment to the previously
>> "private" attribute is missed, no warning will be issued (because
>> Python allows new attributes to be added anywhere, even completely
>> outside the class definition itself). And if the library is widely
>> used, the probability of such bugs occurring is very high.
> 
> So _foo becomes foo. Then:
> 
> class X(object):
>     def get_foo(self): return self._foo
>     def set_foo(self, value): self._foo = value
>     foo = property(get_foo, set_foo)


FWIW, if there's no other need for the property, I'd do it the other way 
round : directly make foo a plain attribute, and add a _foo property 
whose accessors would raise a deprecation warning. Then there's no 
chance I miss a an assignement to _foo !-)



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:11:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:11:22 +0100
Subject: is python Object oriented??
In-Reply-To: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
Message-ID: <49895bad$0$28683$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
(snip)
>> after all, we have used FILE* for years and I have no idea about the FILE
>> structure.
> 
> Your lack of knowledge about it doesn't mean that it has somehow
> magically "private" members. The only reason that most of us don't
> know what a FILE is is that it's definition is implementation-defined
> (i.e., every compiler may define it differently).
> 
> That doesn't have anything to do with private members. For example, on
> my system, <stdio.h> defines FILE as:
> 
> struct _iobuf {
>         char *_ptr;
>         int   _cnt;
>         char *_base;
>         int   _flag;
>         int   _file;
>         int   _charbuf;
>         int   _bufsiz;
>         char *_tmpfname;
>         };

Didn't you notice kind of a pattern here ?

> typedef struct _iobuf FILE;
> 
> Given this information, nothing prevents me from writing things like:
> 
> FILE* fp = fopen("file.txt", "r");
> if (!fp) { /* do something */ }
> 
> printf("fp->_cnt = %d\n", fp->cnt);
> printf("fp->_flag = %d\n", fp->_flag);
> printf("fp->_file = %d\n", fp->_file);
> 
> fp->_flag = 0x20; // OOPS!!

Indeed - and that's exactly the point : nothing prevents you from 
accessing the implementation, *and yet, you don't* - unless of course 
you have a very strong reason to do so for a very specific corner case 
*and* you pretty well know what you're doing *and* you accept the 
implications.



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:14:30 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:14:30 +0100
Subject: is python Object oriented??
In-Reply-To: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
	<e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
Message-ID: <49895c69$0$28683$426a74cc@news.free.fr>

Russ P. a ?crit :
> On Feb 3, 4:14 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
(snip)
>>> If a library developer releases the source code of a library, any user
>>> can trivially "defeat" the access restrictions. But if a team of
>>> developers is checking in code for a project, the leader(s) of the
>>> project can insist that the access restrictions be respected to
>>> simplify the management of interfaces. The larger the team, the more
>>> useful that can be. That's why Java, C++, Ada, Scala, and other
>>> languages have a "private" keyword.
>> Indeed he can.  He can even do that in Python; it just requires a little
>> self-discipline from the team, or a validation script on the code
>> repository if he really doesn't trust them.  Not only can this be done
>> without forcing the rest of the world to play, it makes things a little
>> less daunting when those nice clean interfaces turn out to be
>> incomplete/too slow/not what you thought.
> 
> This has already been refuted several times on this thread alone,

s/refuted/debated/


From jarausch at skynet.be  Wed Feb  4 04:22:13 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 10:22:13 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
Message-ID: <49895e45$0$2860$ba620e4c@news.skynet.be>

Hi,

using e.g.
import subprocess
Package='app-arch/lzma-utils'
EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
EQ_output= EQ.communicate()[0]

EQ_output is a string containing multiple lines.

I'd prefer a file-like object, e.g. EQ_OUT
so that I can loop over the lines of it like

for line in EQ_OUT :
   ...

I could use StringIO.StringIO applied to EQ_output
but this reads all of the command's output into a big
string first.

On Unix/Linux a pipe is a file-like object after all,
so how to get hold of it.


Many thanks for a hint,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From justin.mailinglists at gmail.com  Wed Feb  4 04:27:22 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Wed, 4 Feb 2009 01:27:22 -0800 (PST)
Subject: How do i add body to 'email.mime.multipart.MIMEMultipart' 
	instance?
References: <mailman.8758.1233730247.3487.python-list@python.org>
Message-ID: <62e9fa5a-dff1-425d-b3fe-cb038b717ff5@i24g2000prf.googlegroups.com>

On Feb 4, 2:50?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Hi,
> Could someone tell me the way to add body content to 'email.mime.multipart.MIMEMultipart' instance?
>
> Thanks,
> Srini

excerpt from one of the modules I use:

def build_body(html, text=''):
    text = text.strip() and text or html2text(html).encode('ascii',
'xmlcharrefreplace')
    body = MIMEMultipart('alternative')
    body.attach(MIMEText(text))
    body.attach(MIMEText(html, 'html'))
    return body

HTH

Justin



From mariusbutuc at gmail.com  Wed Feb  4 04:30:16 2009
From: mariusbutuc at gmail.com (Marius Butuc)
Date: Wed, 4 Feb 2009 01:30:16 -0800 (PST)
Subject: Load / Reload module
Message-ID: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>

Hi,

First I must state that I'm a beginner in Python, so all help would be
more than welcomed.

I want do declare some classes (classes.py) in an external editor,
than import the file and use the classes. After I change the file, I
want to reload the definitions w/o leaving the interactive
interpreter.

So far I have tried
- import classes               # doesn't import my classes
- from classes import *     # imports, but I can't reload
- reload(classes)              # I have the same class definition
after this

I've tried the documentation but I got lost, so please help.

Thanks,
Marius


From nick at craig-wood.com  Wed Feb  4 04:31:58 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 03:31:58 -0600
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
	<slrngogniq.muq.nick@irishsea.home.craig-wood.com>
	<106ff6e6-1c23-4adb-8d89-b59d852db458@q30g2000prq.googlegroups.com>
Message-ID: <slrngoimmm.ats.nick@irishsea.home.craig-wood.com>

flagg <ianand0204 at gmail.com> wrote:
>  On Feb 3, 7:32?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> > flagg <ianand0... at gmail.com> wrote:
> > > ?This xmlrpc server is designed to parse dns zone files and then
> > > ?perform various actions on said files. \
> > > ?It uses dnspython, and xmlrpclib
> > > ? I'd like to know what some of the more experienced python users
> > > ?think. Where I could improve code, make it more efficient, whatever.
> > > ?All suggestions are welcome. ?This is my first functional python
> > > ?program, ?and I have tons of questions to go along with whatever
> > > ?suggestions. ? How could I do sanity checking; right now nothing
> > > ?checks the input to these functions, error-handling in this program is
> > > ?almost non-existant how do you integrate decent error handling into a
> > > ?piece of software......ill shut up now.
> >
> > I made a few comments, some about error handling! ?See below
> >
> >
> >
> > > ?import dns.zone
> > > ?from time import localtime, strftime, time
> > > ?import os, sys
> > > ?from dns.rdataclass import *
> > > ?from dns.rdatatype import *
> > > ?from string import Template
> > > ?import xmlrpclib
> > > ?from SimpleXMLRPCServer import SimpleXMLRPCServer
> > > ?from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
> >
> > > ?zoneDir = "/dns"
> >
> > > ?def openZoneFile(zoneFile):
> > > ? ? ?"""
> > > ? ? ?Opens a zone file. ?Then reads in zone file to dnspython zone
> > > ?object.
> > > ? ? ?"""
> > > ? ? ?global zone
> > > ? ? ?global host
> > > ? ? ?global domain
> > > ? ? ?domain = ".".join(zoneFile.split('.')[1:])
> > > ? ? ?host = ".".join(zoneFile.split('.')[:1])
> >
> > > ? ? ?try:
> > > ? ? ? ? ? ? ?zone = dns.zone.from_file(zoneDir + domain + '.zone',
> > > ?domain)
> > > ? ? ?except dns.exception, e:
> > > ? ? ? ? ? ? ?print e.__class__, e
> >
> > Don't use global variables!
> >
> > This function should probably return 3 things
> >
> > ? ? return zone, host, domain
> >
> > And whenever you use it, say
> >
> > ? ? zone, host, domain = openZoneFile(xxx)
> >
> > It should probably be a method of DNSFunctions. ?I'd avoid setting
> > self.zone etc as that is making a different sort of global data which
> > I'd avoid too.
> >
> > Also if the dns.zone.from_file didn't work (raises dns.exception) you
> > set the host and domain but the zone is left at its previous value
> > which probably isn't what you wanted. ?I'd let the error propagate
> > which I think will do something sensible for the xmlrpc.
> >
> >
> >
> > > ?class DNSFunctions:
> >
> > > ? ? ? # Not exposed to xml-rpc calls, used internally only.
> > > ? ? ?def _writeToZoneFile(self, record):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Checks if zone file exists, if it does it write values to zone
> > > ?file
> > > ? ? ? ? ?"""
> >
> > > ? ? ? ? ?for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
> > > ? ? ? ? ? ? ?new_serial = int(strftime('%Y%m%d00', localtime(time())))
> > > ? ? ? ? ? ? ?if new_serial <= rdata.serial:
> > > ? ? ? ? ? ? ? ? ?new_serial = rdata.serial + 1
> > > ? ? ? ? ? ? ?rdata.serial = new_serial
> >
> > > ? ? ? ? ?if os.path.exists(zoneDir + str(zone.origin) + "zone"):
> > > ? ? ? ? ? ? ?f = open(zoneDir + str(zone.origin) + "zone", "w")
> > > ? ? ? ? ? ? ?zone.to_file(f)
> > > ? ? ? ? ? ? ?f.close()
> > > ? ? ? ? ?else:
> > > ? ? ? ? ? ? ?print "Zone: " + zone.origin + " does not exist, please
> > > ?add first"
> >
> > This should probably be raising an exception to be caught or
> > propagated back to the client via xmlrpc.
> >
> >
> >
> >
> >
> > > ? ? ?def showRecord(self, record):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Shows a record for a given zone. Prints out
> > > ? ? ? ? ?TTL, IN, Record Type, IP
> > > ? ? ? ? ?"""
> >
> > > ? ? ? ? ?openZoneFile(record)
> >
> > > ? ? ? ? ?try:
> > > ? ? ? ? ? ? ?rdataset = zone.get_node(host)
> > > ? ? ? ? ? ? ?for rdata in rdataset:
> > > ? ? ? ? ? ? ? ? ?return str(rdata)
> > > ? ? ? ? ?except:
> > > ? ? ? ? ? ? ?raise Exception("Record not found")
> >
> > > ? ? ?def changeRecord(self, record, type, target):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Changes a dns entry.
> > > ? ? ? ? ?@param record: which record to chance
> > > ? ? ? ? ?@param type: ?what type of record, A, MX, NS, CNAME
> > > ? ? ? ? ?@target: if CNAME target points to HOSTNAME, if A record
> > > ?points to IP
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?openZoneFile(record)
> > > ? ? ? ? ?try:
> > > ? ? ? ? ? ? ?rdataset = zone.find_rdataset(host, rdtype=type)
> > > ? ? ? ? ?except:
> > > ? ? ? ? ? ? ?raise Exception("You must enter a valid record and type.
> > > ?See --usage for examples")
> >
> > Don't catch all exceptions - find out which exceptions are thrown.
> > Consider just letting it propagate - hopefully the find_rdataset error
> > is descriptive enough.
> >
> 
>  Thanks for taking the time to reply I appreciate it.

No problems.

>  Are global variables "bad"?  Or just inefficient?

They make code a lot more difficult to follow because you have to
wonder where the variable has been set.  If you create multiple
instances of DNSFunctions (more than likely in a multi-user server)
you'll find that global variables will cause your program to go wrong
quite badly!

In general only ever use global variables in quick and dirty scripts.
For static configuration which you might think globals are good for
you can easily do that in a module namespace or in a Config object
which you only have one of.

>  Also when you say:
> 
>  "Also if the dns.zone.from_file didn't work (raises dns.exception) you
>  set the host and domain but the zone is left at its previous value
>  which probably isn't what you wanted.  I'd let the error propagate
>  which I think will do something sensible for the xmlrpc."
> 
>  Could you elaborate on that.  Im not following what you mean by
>  "propagate"

I mean don't catch the exception.  If you raise an exception while in
an RPC it will get propagated back to the client which is exactly what
you want.

Eg, run this in one window

import SimpleXMLRPCServer

class SimpleTest:
    def divide(self, x, y):
        """Does an integer divide"""
        print "About to divide %r by %r" % (x, y)
        return x // y
    
server = SimpleXMLRPCServer.SimpleXMLRPCServer(("localhost", 8000))
server.register_instance(SimpleTest())
server.serve_forever()

And this in another

import xmlrpclib

server = xmlrpclib.Server('http://localhost:8000')
print server.divide(6, 3)
print server.divide(6, 2)
print server.divide(6, 0)

The client will print

2
3
Traceback (most recent call last):
  File "xmlrpc_client.py", line 6, in <module>
    print server.divide(6, 0)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1147, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1437, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.5/xmlrpclib.py", line 1201, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1340, in
  _parse_response
    return u.close()
  File "/usr/lib/python2.5/xmlrpclib.py", line 787, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: "<type 'exceptions.ZeroDivisionError'>:integer division or modulo by zero">

Whereas the server will keep running with

About to divide 6 by 3
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -
About to divide 6 by 2
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -
About to divide 6 by 0
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -

So in general if the error is caused by the client, send it back to
the client by not catching it in the server.  The server will keep
running and the client will know it has done something wrong.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Wed Feb  4 04:31:59 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 03:31:59 -0600
Subject: Cross platform compilation?
References: <gm8buh+ofl4@eGroups.com>
	<mailman.8736.1233700935.3487.python-list@python.org>
Message-ID: <slrngoinqm.ats.nick@irishsea.home.craig-wood.com>

Christian Heimes <lists at cheimes.de> wrote:
>  John Harper schrieb:
> > I am trying to build Python to use in an embedded system which uses a 
> > ppc_440 CPU. The only information I've found is something written by 
> > Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
> > seem to have successfully built Python itself, but building the 
> > extensions fails miserably with complaints about library format. It 
> > insists on referring to "i686" which is indeed the platform it is 
> > actually running on.
> > 
> > Before I try to reverse engineer completely setup.py, is there 
> > something obvious that needs to be done to get it to use the right tool 
> > chain?

I spent some time mucking about trying to do this for ARM.  I almost
got it to work using qemu but not quite!  What I did in the end was to
use a pre-compiled python (from debian) then copy the headers and
library files into the cross compiling environment so we could embed
python into our code and build our extensions.

> > More generally, it seems like this would be something that lots of 
> > people would want to do. I'm surprised there isn't support for it built 
> > into the distributed version of Python, without having to hack all the 
> > setup files...?
> 
>  I'm sorry to inform you that Python doesn't support cross platform
>  compilation. Python eats its own dog food and uses Python to compile
>  optional extension modules.

It isn't an impossible problem...

If you've ever cross compiled gcc you'll find that it first uses the
host compiler (possibly not gcc) to compile itself to make a gcc which
runs on the host but makes code for the target.  It then uses that new
compiler to compile a gcc for the target architecture.

I could imagine a similar scheme for python, but it would involve lots
of fiddling about and some commitment from the python maintainers.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From clp2 at rebertia.com  Wed Feb  4 04:43:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 01:43:37 -0800
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <49895e45$0$2860$ba620e4c@news.skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
Message-ID: <50697b2c0902040143p66b4e2dfy7ba53e8a8397a020@mail.gmail.com>

On Wed, Feb 4, 2009 at 1:22 AM, Helmut Jarausch <jarausch at skynet.be> wrote:
> Hi,
>
> using e.g.
> import subprocess
> Package='app-arch/lzma-utils'
> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
> EQ_output= EQ.communicate()[0]
>
> EQ_output is a string containing multiple lines.
>
> I'd prefer a file-like object, e.g. EQ_OUT
> so that I can loop over the lines of it like
>
> for line in EQ_OUT :
>  ...

Is there some reason that:

for line in EQ_OUT.splitlines():
    #...

Does not meet your needs?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From skippy.hammond at gmail.com  Wed Feb  4 04:43:40 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 04 Feb 2009 20:43:40 +1100
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
Message-ID: <4989634C.4020108@gmail.com>

On 4/02/2009 4:51 AM, Victor Lin wrote:
> It may looks like this.
>
>      void operator() (double time, const AudioData&data) {
>          // acquire lock
>          m_Function(time, data);
>          // release lock
>      }

You want something like:

       void operator() (double time, const AudioData&data) {
           PyGILState_STATE old = PyGILState_Acquire();
           m_Function(time, data);
           PyGILState_Release(old);

Note that Phillip is also correct; you will need to initialize threading 
if this is an app which embeds Python...

HTH,

Mark


From Scott.Daniels at Acm.Org  Wed Feb  4 04:43:58 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 01:43:58 -0800
Subject: Load / Reload module
In-Reply-To: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
References: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
Message-ID: <cpmdnUN0pblz_xTUnZ2dnUVZ_hidnZ2d@pdx.net>

Marius Butuc wrote:
> I want do declare some classes (classes.py) in an external editor,
> than import the file and use the classes. After I change the file, I
> want to reload the definitions w/o leaving the interactive
> interpreter.
> 
> So far I have tried
> - import classes               # doesn't import my classes
Use this and refer to the class from the imported module.

     import classes
     instance = classes.SomeClass()
     ...
     reload(classes)
     instance = classes.SomeClass()

This is by far the best way, but if you _must_,
     from classes import *
     instance = SomeClass()
     ...
     reload(classes)
     from classes import *
     instance = SomeClass()

--Scott David Daniels
Scott.Daniels at Acm.Org


From skippy.hammond at gmail.com  Wed Feb  4 04:49:14 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 04 Feb 2009 20:49:14 +1100
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <4989634C.4020108@gmail.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<4989634C.4020108@gmail.com>
Message-ID: <4989649A.1000802@gmail.com>

On 4/02/2009 8:43 PM, I wrote:
> PyGILState_STATE old = PyGILState_Acquire();

Make that PyGILState_Ensure();

Mark


From andrew at acooke.org  Wed Feb  4 05:03:38 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 02:03:38 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
Message-ID: <1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>

On Feb 3, 7:35?pm, David Sevilla <sevil... at gmail.com> wrote:
> I am quite new to Linux, and thought that by using yast2 there would
> be no user problems (I am asked for the root password). I will sudo it
> to see if it solves the problem.

yast asked you for the password so that easy_install could be
installed correctly.

you are now using "sudo easy_install" to install mnemosyne and sudo is
asking for the root password.

each time you install something you need to change public files on the
system, and so each time you need to use root in some way.  yast does
this by logging in as root for you, but needs the password to do it.
sudo does the same thing, but again needs the password to do it.

hope that makes senses (and that this worked).

andrew


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 05:12:40 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 11:12:40 +0100
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>	<005201c98549$d3eb74a0$0d00a8c0@hendrik>	<mailman.8661.1233621338.3487.python-list@python.org>	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>	<mailman.8668.1233632951.3487.python-list@python.org>	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>	<498825f3$0$3303$426a74cc@news.free.fr>
	<pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <49896a0b$0$3507$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Tue, 03 Feb 2009 12:09:46 +0100, Bruno Desthuilliers wrote:
> 
>>> I love Python, and I'm greedy and want it all: I want a dynamic,
>>> easy-to- use language *and* a compiler that can protect me from myself
>> That's not what compilers are for.
> 
> So you say.

While it's quite clear that a compiler for a statically typed language 
can catch at least some type errors, this is still not what a compiler 
is for. A compiler is here to compile you source code into a suitable 
representation for the execution environment. And FWIW, some compilers 
are rather weaker than Python when it comes to "protecting you from 
yourself".

>  
>>> and bad data.
>> I definitly fail to see how a compiler could protect you from *runtime*
>> issues ???
> 
> I'm surprised you can't. Any time a compiler prevents an error by 
> detecting it at compile-time (say, attempting to store a 96-bit float 
> into the memory space allocated for a 32-bit int),

Oh, you meant "type error". But this is a programming error, not "bad 
data". "bad data" is something you get (usually from the outside world) 
at runtime only. Well, the way I understand it, at least.

> 
> Perhaps what you are thinking is that I meant compilers can protect you 
> from "all" runtime issues. That would be silly. Although, in principle, 
> we can get close, for some definition of "close".
> 
> 
> Here's a toy function, and a specification:
> 
> def inverse(x):
>     return 1.0/x
> 
> Specification: input must be a float, output must be a float.
> 
> Is that function correct? No, because it will raise an exception if 
> x==0.0. Python's compiler is dumb and will allow you to write incorrect 
> functions, but a smart compiler could look at that function and see that 
> it was incorrect. The fix would then be to change the code, or the 
> specification, or both.

Ok, let's see. What happens if you pass 0.0 to the function as-is ? Yes, 
indeed, you get a runtime error. Now what happens if you add error 
handling to the function itself ? What will the error handler do ? Yes, 
raise a runtime error. So far, I don't see any gain here. No, no, don't 
answer yet. Sure, what you need here is a compiler that can inspect the 
whole code source using this function to make sure it is always properly 
invoked. Mmm, wait - will this work with shared libs ? I'm afraid not. 
Ok, so you have to change the specification to : "input must be a 
non-zero-float", and use the type system to define non-zero-float type.

> Smart compilers turn some runtime errors into compile-time errors.

Indeed.

> The 
> earlier you catch the error, the easier it is to fix it.

Indeed.

> Now, that's a toy example. Languages like Ada make correctness proofs, 
> well, perhaps not easy, but merely difficult compared to impossible for 
> languages like Python.

Indeed. And that's fine : if we want maximum type safety and 
as-possibly-proved code, we know which tool to use. Now good luck doing 
web development, system admin, app scripting and quite a lot of other 
things (well, perhaps more that 80% of ordinary application programming) 
in Ada.

Can you understand that not everybody needs maximum type safety / 
correctness proof etc for all his code ? That all this "security" stuff 
comes with a price that may not be worth paying ?

> To bring it back to private/public attributes, side-effects make 
> correctness proofs difficult. Modifications of attributes are side-
> effects.

Then use a functional language !-)

> When attributes are subject to being modified by arbitrary code, 
> it is harder to reason about the correctness of the code:

Indeed. Not the right tool, obviously. OTHO, it makes it way easier to 
use as glue between different, sometimes not highly compatible components.

(snip)

> There are two usual approaches to dealing with that problem which are 
> available to Python programmers:
> 
> (1) Paranoia. Make the developer responsible for checking everything all 
> the time:


Paranoiacs (also known as control-freaks) are not happy using Python. 
They usually prefer Ada or, at least, Java.

>     def invert(self):
>         x = self.x
>         if isinstance(x, float) and x:
>             return 1.0/self.x
>         else:
>             raise MyError('post-condition x a non-zero float violated')


The correct solution is indeed to make x a property with a sanity check 
in the setter - in which case you'll have a useful traceback - or as a 
read-only property, or even better to just declare it as implementation 
(naming it _x).

> 
> (2) Hope the error never occurs, and if it does, let the caller deal with 
> it.

If the attribute is either a read-only property or an implementation 
attribute, then the guy that messed with it is responsible for the 
possible consequences. That's the contract, yes.

> Hopefully you aren't your own caller.

I'm usually the first user of my own libs, and my coworkers comes 
immediatly after. IOW, I eat my own dogfood, thanks.

> That's often the Python approach.

As I explained above, the "Python approach" is actually a bit different.

In your example code, you explicitely declared x as a *public* 
attribute. Which is not wise - whatever the language - if you have to 
maintain invariants on this attribute. Make it either an implementation 
attribute or a read-only property.

(snip usual stuff about nuclear disasters, x-ray-overdosed patients etc)

> There is a third strategy, sadly not available to Python programmers: 
> prevention by catching potential errors at compile-time. (Python does 
> catch some errors at compile-time, but only syntax errors.)

Yes. Because *everything* else happens at runtime. Remember, even "def" 
and "class" are executable statements.

> If x can only 
> be modified in a few places, (that is, it is effectively hidden or 
> private) then it is much easier to reason about program correctness, 
> avoid bugs, and debug those bugs which do occur.

Would you then say that Ruby has "real privates" attributes ?


> No, this is not a panacea which will prevent every imaginable bug.

Indeed.

> Nor is 
> it a replacement for unit-testing (which also does not prevent every 
> imaginable bug). 

Neither.



From thorsten at thorstenkampe.de  Wed Feb  4 05:14:55 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 4 Feb 2009 11:14:55 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <MPG.23f38905b623184e9897bf@news.individual.de>

* Russ P. (Tue, 3 Feb 2009 21:04:30 -0800 (PST))
> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?
> 
> What people like you are saying is that you don't need no stinkin'
> locks because your co-workers are all "consenting adults" whom you
> trust. Actually, you're saying even more than that. You're saying that
> office doors never need locks, because everyone should trust their co-
> workers. All you need is a "keep-out" sign on the door (leading
> underscores). And you are presenting as evidence for your position the
> fact that people occasionally get locked out of an office that they
> need to get into.
> 
> I'm saying, fine, if you trust your co-workers, then keep the doors
> unlocked, but please don't insist that office doors come without
> locks. Yes, locks occasionally cause inconvenience, but they serve a
> very useful purpose if used properly.

This analogy is not adequate. If someone uses your library then it is 
his office and nothing can stop him. Someone else gave a better analogy 
with a device that says that the warranty is lost if you open it. And 
that's exactly the same with the underscore convention.

Thorsten


From robin at reportlab.com  Wed Feb  4 05:14:56 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 04 Feb 2009 10:14:56 +0000
Subject: x64 speed
In-Reply-To: <4988BAE8.2060204@v.loewis.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>
	<4988BAE8.2060204@v.loewis.de>
Message-ID: <49896AA0.2050202@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>>> I follow David's guess that Linux does better IO than Windows (not
>>> knowing anything about the benchmark, of course)
>>>
>> I originally thought it must be the vmware host stuff offloading IO to
>> the second core, but watching with sysinternals didn't show a lot of
>> extra stuff going on with the vm compared to just running on the host.
> 
> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
> Linux buffer handling, is just more efficient than NTFS, and the Windows
> buffer handling.
> 
> If you split the total runtime into system time and user time, how do
> the 30s split up?
.......
so here is one for the vm clock is bad theorists :)


> [rptlab at localhost tests]$ time python25 runAll.py
> .............................................................

.........................
> ----------------------------------------------------------------------
> Ran 193 tests in 27.841s
> 
> OK
> 
> real    0m28.150s
> user    0m26.606s
> sys     0m0.917s
> [rptlab at localhost tests]$

magical how the total python time is less than the real time.
-- 
Robin Becker


From robin at reportlab.com  Wed Feb  4 05:14:56 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 04 Feb 2009 10:14:56 +0000
Subject: x64 speed
In-Reply-To: <4988BAE8.2060204@v.loewis.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>
	<4988BAE8.2060204@v.loewis.de>
Message-ID: <49896AA0.2050202@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>>> I follow David's guess that Linux does better IO than Windows (not
>>> knowing anything about the benchmark, of course)
>>>
>> I originally thought it must be the vmware host stuff offloading IO to
>> the second core, but watching with sysinternals didn't show a lot of
>> extra stuff going on with the vm compared to just running on the host.
> 
> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
> Linux buffer handling, is just more efficient than NTFS, and the Windows
> buffer handling.
> 
> If you split the total runtime into system time and user time, how do
> the 30s split up?
.......
so here is one for the vm clock is bad theorists :)


> [rptlab at localhost tests]$ time python25 runAll.py
> .............................................................

.........................
> ----------------------------------------------------------------------
> Ran 193 tests in 27.841s
> 
> OK
> 
> real    0m28.150s
> user    0m26.606s
> sys     0m0.917s
> [rptlab at localhost tests]$

magical how the total python time is less than the real time.
-- 
Robin Becker



From nick at craig-wood.com  Wed Feb  4 05:31:58 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 04:31:58 -0600
Subject: MySQLdb and MySQL stored functions
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>
	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
	<0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
Message-ID: <slrngoio1a.ats.nick@irishsea.home.craig-wood.com>

kurt.forrester.fec at googlemail.com <kurt.forrester.fec at googlemail.com> wrote:
>  Any ideas on how to suppress the warning output:
>  __main__:1: Warning: No data - zero rows fetched, selected, or
>  processed

You can use the warnings module to suppress these I would have
thought.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jarausch at skynet.be  Wed Feb  4 05:48:42 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 11:48:42 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8762.1233740621.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8762.1233740621.3487.python-list@python.org>
Message-ID: <49897289$0$2855$ba620e4c@news.skynet.be>

Chris Rebert wrote:
> On Wed, Feb 4, 2009 at 1:22 AM, Helmut Jarausch <jarausch at skynet.be> wrote:
>> Hi,
>>
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>>
>> EQ_output is a string containing multiple lines.
>>
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
>>
>> for line in EQ_OUT :
>>  ...
> 
> Is there some reason that:
> 
> for line in EQ_OUT.splitlines():
>     #...
> 
> Does not meet your needs?
> 

It works, but it still reads the complete output of the
command executed by Popen at once.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From __peter__ at web.de  Wed Feb  4 05:49:55 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 04 Feb 2009 11:49:55 +0100
Subject: Load / Reload module
References: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
	<cpmdnUN0pblz_xTUnZ2dnUVZ_hidnZ2d@pdx.net>
Message-ID: <gmbrsj$kdt$01$1@news.t-online.com>

Scott David Daniels wrote:

> Marius Butuc wrote:
>> I want do declare some classes (classes.py) in an external editor,
>> than import the file and use the classes. After I change the file, I
>> want to reload the definitions w/o leaving the interactive
>> interpreter.
>> 
>> So far I have tried
>> - import classes               # doesn't import my classes
> Use this and refer to the class from the imported module.
> 
>      import classes
>      instance = classes.SomeClass()
>      ...
>      reload(classes)
>      instance = classes.SomeClass()
> 
> This is by far the best way, but if you _must_,
>      from classes import *
>      instance = SomeClass()
>      ...
>      reload(classes)
>      from classes import *
>      instance = SomeClass()

Also note that only instances created after the reload will have the new
layout:

>>> import classes
>>> a = classes.SomeClass()
>>> print a
old
>>> open("classes.py", "w").write("""class SomeClass:
...   def __str__(self): return 'new'
... """)
>>> reload(classes)
<module 'classes' from 'classes.py'>
>>> b = classes.SomeClass()
>>> print b
new
>>> print a
old

Sometimes you may be able to fix this manually by assigning to the
__class__:

>>> a.__class__ = classes.SomeClass
>>> print a
new

but I recommend that you put all your code into a another script rather than
resorting to such tricks

$ cat main.py
import classes
a = classes.SomeClass()

If you want to experiment with a in the interactive interpreter you can
invoke main with the -i option:

$ python -i main.py
>>> print a
new

Peter


From tino at wildenhain.de  Wed Feb  4 06:31:33 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 12:31:33 +0100
Subject: Locating python
In-Reply-To: <1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
Message-ID: <49897C95.1000301@wildenhain.de>

andrew cooke wrote:
> On Feb 3, 7:35 pm, David Sevilla <sevil... at gmail.com> wrote:
>> I am quite new to Linux, and thought that by using yast2 there would
>> be no user problems (I am asked for the root password). I will sudo it
>> to see if it solves the problem.
> 
> yast asked you for the password so that easy_install could be
> installed correctly.
> 
> you are now using "sudo easy_install" to install mnemosyne and sudo is
> asking for the root password.
> 
> each time you install something you need to change public files on the
> system, and so each time you need to use root in some way.  yast does
> this by logging in as root for you, but needs the password to do it.
> sudo does the same thing, but again needs the password to do it.
> 
> hope that makes senses (and that this worked).

actually "su" needs the root (or the target users') password
and sudo needs _your_ (the current users) password.

HTH
Tino
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From simon at brunningonline.net  Wed Feb  4 06:37:26 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 4 Feb 2009 11:37:26 +0000
Subject: v 3.0 mpkg
In-Reply-To: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
Message-ID: <8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>

2009/2/4 John Forse <johnforse at talktalk.net>:
>  Does anyone know if Python v3.0 is available as an .mpkg installer for Mac
> 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't find any
> reference to one on the Python.org download site. I've downloaded the Python
> 3.0 folder but can't follow how to install it without a .mpkg file. Any help
> would be really appreciated.

AFAIK there's no Python 3.0 installer for the Mac. You'll have to
build it yourself - see <http://tinyurl.com/6zkem7>.

-- 
Cheers,
Simon B.


From noama at answers.com  Wed Feb  4 06:40:59 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 4 Feb 2009 13:40:59 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <49897C95.1000301@wildenhain.de>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>

Hi All,
I have a script in which I receive a list of functions. I iterate over
the list and run each function. This functions are created by some other
user who is using the lib I wrote. Now, there are some cases in which
the function I receive will never finish (stuck in infinite loop).
Suppose I use a thread which times the amount of time passed since the
function has started, Is there some way I can kill the function after a
certain amount of time has passed (without asking the user who's giving
me the list of functions to make them all have some way of notifying
them to finish)?
Thanks, Noam


From nosklo at gmail.com  Wed Feb  4 07:06:58 2009
From: nosklo at gmail.com (Clovis Fabricio)
Date: Wed, 4 Feb 2009 10:06:58 -0200
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <49895e45$0$2860$ba620e4c@news.skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
Message-ID: <9187a60d0902040406s7d1e5da1l44ee57abf0e6c8e@mail.gmail.com>

2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
> using e.g.
> import subprocess
> Package='app-arch/lzma-utils'
> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
> EQ_output= EQ.communicate()[0]
> EQ_output is a string containing multiple lines.
> I'd prefer a file-like object, e.g. EQ_OUT
> so that I can loop over the lines of it like

EQ.stdout is the filelike object you're looking for.
communicate() grabs entire output at once so don't use it.

import subprocess
Package = 'app-arch/lzma-utils'
EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
stdout=subprocess.PIPE)
for line in EQ.stdout:
    do_stuff_with(line)


From kareta at web.de  Wed Feb  4 07:12:51 2009
From: kareta at web.de (Juergen Kareta)
Date: Wed, 04 Feb 2009 13:12:51 +0100
Subject: python libpcap equivalent
In-Reply-To: <mailman.8726.1233694063.3487.python-list@python.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>
Message-ID: <6utf23Fh6fakU1@mid.individual.net>

Gabriel schrieb:
> Hello
> 
> I need to write a software router [yes, software equivalent to a 
> hardware box that is routing packets .)]. It's a school
> work..
> Question is: is possible write this kind of application in python? and 
> if it's, what module should i use?
> I tried search for some libpcap equivalent in python and found 
> pylibpcap, but can't find documentation and tutorial.

Hello Gabriel,

you might look into scapy:
http://www.secdev.org/projects/scapy/

which easily allows you to fetch, manipulate and send network packages.

J?rgen


From jarausch at skynet.be  Wed Feb  4 07:13:03 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 13:13:03 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8770.1233749221.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
Message-ID: <4989864F.50700@skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>> EQ_output is a string containing multiple lines.
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
> 
> EQ.stdout is the filelike object you're looking for.
> communicate() grabs entire output at once so don't use it.
> 
> import subprocess
> Package = 'app-arch/lzma-utils'
> EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
> stdout=subprocess.PIPE)
> for line in EQ.stdout:
>     do_stuff_with(line)

Thanks a lot, I haven't found that in the official documentation.
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From jarausch at skynet.be  Wed Feb  4 07:13:03 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 13:13:03 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8770.1233749221.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
Message-ID: <4989864F.50700@skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>> EQ_output is a string containing multiple lines.
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
> 
> EQ.stdout is the filelike object you're looking for.
> communicate() grabs entire output at once so don't use it.
> 
> import subprocess
> Package = 'app-arch/lzma-utils'
> EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
> stdout=subprocess.PIPE)
> for line in EQ.stdout:
>     do_stuff_with(line)

Thanks a lot, I haven't found that in the official documentation.
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From andrew at acooke.org  Wed Feb  4 07:16:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 04:16:37 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com> 
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com> 
	<mailman.8767.1233747099.3487.python-list@python.org>
Message-ID: <86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>

> actually "su" needs the root (or the target users') password
> and sudo needs _your_ (the current users) password.

argh, sorry for the confusion.


From nosklo at gmail.com  Wed Feb  4 07:19:33 2009
From: nosklo at gmail.com (Clovis Fabricio)
Date: Wed, 4 Feb 2009 10:19:33 -0200
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <4989864F.50700@skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
	<4989864F.50700@skynet.be>
Message-ID: <9187a60d0902040419h3eb27695v97e336c13b5d1e30@mail.gmail.com>

2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> EQ.stdout is the filelike object you're looking for.
>> communicate() grabs entire output at once so don't use it.
> Thanks a lot, I haven't found that in the official documentation.
> Helmut.

That would be a documentation bug.
Fortunately it is not true. Here is it in the documentation:

http://docs.python.org/library/subprocess.html#subprocess.Popen.stdout


From andrew at acooke.org  Wed Feb  4 07:29:12 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 04:29:12 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com> 
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com> 
	<mailman.8767.1233747099.3487.python-list@python.org>
	<86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>
Message-ID: <44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>

On Feb 4, 9:16?am, andrew cooke <and... at acooke.org> wrote:
> > actually "su" needs the root (or the target users') password
> > and sudo needs _your_ (the current users) password.
>
> argh, sorry for the confusion.

actually, no.  sudo requires the root password.  at least on opensuse
11.1 default config.  i just tried it:

> Python-2.5.4: sudo make install
root's password:

this is explained in the sudoers file:

 # In the default (unconfigured) configuration, sudo asks for the root
password.
 # This allows use of an ordinary user account for administration of a
freshly
 # installed system. When configuring sudo, delete the two
 # following lines:
 Defaults targetpw   # ask for the password of the target user i.e.
root
 ALL     ALL=(ALL) ALL   # WARNING! Only use this together with
'Defaults targetpw'!

andrew


From jarausch at skynet.be  Wed Feb  4 08:00:53 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 14:00:53 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8772.1233749977.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>	<mailman.8770.1233749221.3487.python-list@python.org>	<4989864F.50700@skynet.be>
	<mailman.8772.1233749977.3487.python-list@python.org>
Message-ID: <49899185$0$2861$ba620e4c@news.skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>>> EQ.stdout is the filelike object you're looking for.
>>> communicate() grabs entire output at once so don't use it.
>> Thanks a lot, I haven't found that in the official documentation.
>> Helmut.
> 
> That would be a documentation bug.
> Fortunately it is not true. Here is it in the documentation:
> 
> http://docs.python.org/library/subprocess.html#subprocess.Popen.stdout

Thanks!

For people like me which don't always read until the end of a document
it would be nice if just after the paragraph

stdin, stdout and stderr specify the executed programs? standard input, standard output and standard error file handles, 
respectively. Valid values are PIPE, an existing file descriptor (a positive integer), an existing file object, and 
None. PIPE indicates that a new pipe to the child should be created. With None, no redirection will occur; the child?s 
file handles will be inherited from the parent. Additionally, stderr can be STDOUT, which indicates that the stderr data 
from the applications should be captured into the same file handle as for stdout.

there would some lines like

These pipes are exposed as file-like objects which can be accessed via the
stdin, stdout or stderr (resp.) attributes of an object of class subprocess.Popen .

Please be indulgent to people like me.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From kyrie at uh.cu  Wed Feb  4 08:27:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 04 Feb 2009 08:27:10 -0500
Subject: is python Object oriented??
In-Reply-To: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
	<e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
Message-ID: <1233754030.498997ae36410@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> > Indeed he can.  He can even do that in Python; it just requires a little
> > self-discipline from the team, or a validation script on the code
> > repository if he really doesn't trust them.  Not only can this be done
> > without forcing the rest of the world to play, it makes things a little
> > less daunting when those nice clean interfaces turn out to be
> > incomplete/too slow/not what you thought.
> 
> This has already been refuted several times on this thread alone, so I
> will not bother doing it again.
> 

Please, point out where, because I don't recall you explaining why is not enough
to use a "validation script" on the code if you wish to. I _do_ recall you
saying that you didn't want the validation script unless it is integrated with
python, but I'm yet to see the difference.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From kyrie at uh.cu  Wed Feb  4 08:35:50 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 04 Feb 2009 08:35:50 -0500
Subject: is python Object oriented??
In-Reply-To: <11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <1233754550.498999b6356d9@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?

This analogy is nonsense. There is no way you will execute code on my system if
I don't authorize it, regardless of how "public" are the variables declared in
my code. No one will execute code on _your_ system either, without your
authorization. That puts you in a different position: you can easily _check_
that everything is alright before executing, whereas in the office example, it
cannot be done.

Of course, if the analogy is flawed in such an essential aspect, I won't even
humor it. I worry, though, that you obviously believe that it is not flawed.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From Pat at junk.net  Wed Feb  4 09:38:04 2009
From: Pat at junk.net (Pat)
Date: Wed, 04 Feb 2009 09:38:04 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de>
Message-ID: <gmc979$b9r$1@aioe.org>

Andreas Waldenburger wrote:
> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
> 
>> Tobiah wrote:
>>> Just out of curiosity, why was len() made to
>>> be it's own function?  I often find myself
>>> typing things like my_list.len before I
>>> catch myself.
>>>
>>> Thanks,
>>>
>>> Toby
>> I'm surprised that no one responded to that question.
>>
> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
> Might it be that your newsserver is a bit laggy?
> 
> regards
> /W
> 

Might be laggy.  Who knows.

Why didn't you answer the len() question?


From unews at nospam.onlinehome.de  Wed Feb  4 09:46:53 2009
From: unews at nospam.onlinehome.de (Uwe Grauer)
Date: Wed, 04 Feb 2009 15:46:53 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <mailman.8719.1233689579.3487.python-list@python.org>
References: <mailman.8719.1233689579.3487.python-list@python.org>
Message-ID: <gmc9ot$ops$1@online.de>

Laszlo Nagy wrote:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
> 
> My problem:
> 
>    * python 2.6 already installed on a server
>    * there is a firebird 1.5 database on the same server
>    * I need to access it from python 2.6
> 
> Any thoughts?
> 
> 

Get it from here:
http://www.firebirdsql.org/index.php?op=devel&sub=python

You should have mentioned your OS to get better answers.

Uwe


From ljjediknight at gmail.com  Wed Feb  4 10:01:23 2009
From: ljjediknight at gmail.com (Luke)
Date: Wed, 4 Feb 2009 07:01:23 -0800 (PST)
Subject: Tkinter
Message-ID: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>

Hello, I'm an inexperienced programmer and I'm trying to make a
Tkinter window and have so far been unsuccessful in being able to
delete widgets from the main window and then add new ones back into
the window without closing the main window.

The coding looks similar to this:

from Tkinter import *
def MainWin():
    main=Tk()
    main.geometry('640x480')
    back_ground=Frame(main,width=640,height=480,bg='black')
    back_ground.pack_propagate(0)
    back_ground.pack(side=TOP,anchor=N)
    frame1=Frame(back_ground,width=213,height=480,bg='light gray')
    frame1.pack_propagate(0)
    frame1.pack(side=TOP,anchor=N)
    close_frame1=Button(frame1,text='close',bg='light gray',
command=frame1.destroy)
    close_frame1.pack_propagate(0)
    close_frame1.pack(side=TOP, anchor=N,pady=25)
    if frame1.destroy==True:
        frame1=Frame(back_ground,width=213,height=480,bg='white')
        frame1.pack_propagate(0)
        frame1.pack(side=TOP,anchor=N)
    main.mainloop()
MainWin()

It may just be bad coding but either way I could use some help.

Thanks


From marco at sferacarta.com  Wed Feb  4 10:02:08 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 04 Feb 2009 16:02:08 +0100
Subject: len()
In-Reply-To: <gmc979$b9r$1@aioe.org>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de> <gmc979$b9r$1@aioe.org>
Message-ID: <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>

Pat wrote:

> Why didn't you answer the len() question?

It's a bit of a FAQ: len() cannot be a method of list objects because it 
works on any sequence or iterable.



From floris.bruynooghe at gmail.com  Wed Feb  4 10:08:32 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Wed, 4 Feb 2009 07:08:32 -0800 (PST)
Subject: x64 speed
References: <mailman.8707.1233682582.3487.python-list@python.org> 
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
	<4988B615.4060206@jessikat.plus.net> 
	<4988BAE8.2060204@v.loewis.de>
	<mailman.8766.1233742525.3487.python-list@python.org>
Message-ID: <b2e99eb5-2c19-4886-ae00-30f5d7ead160@i18g2000prf.googlegroups.com>

On Feb 4, 10:14?am, Robin Becker <ro... at reportlab.com> wrote:
> > [rptlab at localhost tests]$ time python25 runAll.py
> > .............................................................
>
> .........................
>
> > ----------------------------------------------------------------------
> > Ran 193 tests in 27.841s
>
> > OK
>
> > real ? ?0m28.150s
> > user ? ?0m26.606s
> > sys ? ? 0m0.917s
> > [rptlab at localhost tests]$
>
> magical how the total python time is less than the real time.

Not really.  Python was still running at the time that it prints the
time of the tests.  So it's only natural that the wall time Python
prints on just the tests is going to be smaller then the wall time
time prints for the entire python process.  Same for when it starts,
some stuff is done in Python before it starts its timer.

Regards
Floris



From tino at wildenhain.de  Wed Feb  4 10:14:58 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 16:14:58 +0100
Subject: Locating python
In-Reply-To: <44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<mailman.8767.1233747099.3487.python-list@python.org>	<86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>
	<44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>
Message-ID: <4989B0F2.30107@wildenhain.de>

andrew cooke wrote:
> On Feb 4, 9:16 am, andrew cooke <and... at acooke.org> wrote:
>>> actually "su" needs the root (or the target users') password
>>> and sudo needs _your_ (the current users) password.
>> argh, sorry for the confusion.
> 
> actually, no.  sudo requires the root password.  at least on opensuse
> 11.1 default config.  i just tried it:
> 

argh. This N?rnberg Windows ;-)

But this shows that a sensible configuration of the
system is usefull before you start installing
services on it :-)

Cheers
Tino

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From matt.dubins at sympatico.ca  Wed Feb  4 10:21:14 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Wed, 4 Feb 2009 07:21:14 -0800 (PST)
Subject: tkSimpleDialog window focus problem
Message-ID: <238e1e3c-66aa-45de-9a67-2b91e15bc465@x6g2000pre.googlegroups.com>

Hi all,

As part of the program I've created and am maintaining, the user has
to type in his/her username and password into tkinter simple dialog
windows.  What you'll see below is that I've nested an askstring
dialog window within a call to use the ftp module to login to an FTP
server.

result = self.ftp.login(self.userid, tkSimpleDialog.askstring
("Password Entry",
                                              "Password:", show="*"))

Annoyingly, every time this password entry window pops up, the focus
does not go on it automatically.  Anyone know what I can do to put the
focus on it automatically, while *not* storing the user's password in
my script for the remainder of its runtime?

Thanks,
Matt Dubins


From marduk at letterboxes.org  Wed Feb  4 10:25:52 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 04 Feb 2009 10:25:52 -0500
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
	<749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
Message-ID: <1233761152.373.14.camel@localhost.localdomain>

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after a
> certain amount of time has passed (without asking the user who's giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a





From Russ.Paielli at gmail.com  Wed Feb  4 10:53:54 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Wed, 4 Feb 2009 07:53:54 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
	<mailman.8774.1233754556.3487.python-list@python.org>
Message-ID: <fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>

On Feb 4, 5:35?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> Quoting "Russ P." <Russ.Paie... at gmail.com>:
>
> > Imagine you own a company, and you decide to lease an office building.
> > Would you expect the office doors to have locks on them? Oh, you
> > would? Why? You mean you don't "trust" your co-workers? What are locks
> > but enforced access restriction?
>
> This analogy is nonsense. There is no way you will execute code on my system if
> I don't authorize it, regardless of how "public" are the variables declared in
> my code. No one will execute code on _your_ system either, without your
> authorization. That puts you in a different position: you can easily _check_
> that everything is alright before executing, whereas in the office example, it
> cannot be done.

I don't follow your point, but I think you are reading too much into
the analogy. Obviously, an office building cannot be "copied" in a few
seconds as a software library can, so the analogy obviously cannot be
taken too far.

The locks on the doors are analogous to enforced access restrictions.
When you lease the building, you are presumably given a complete set
of keys, including master keys. The keys are analogous to the source
code, which allows you to trivially disable the access restrictions.

People like you are saying that keys are not enough. You don't want to
be bothered with keys. You want the office doors to come with no locks
on them at all, because you don't intend to lock them anyway, and
someone could possibly get locked out someday. You are saying that
locks are unnecessary because you trust your co-workers (aren't you
lucky!), and you can just put "keep-out" signs on the doors (leading
underscores).

Well, that may be reasonable for a small group of developers working
on a small, "cool" project. It is inappropriate, however, for a large,
safety-critical project with dozens or hundreds of developers that are
hired off the street in accordance with current labor laws. Now, if
you concede that Python is just not intended for such projects, then
fine, but please don't claim that access restrictions are useless for
all applications and domains. That's just ridiculous.


From noama at answers.com  Wed Feb  4 10:54:09 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 4 Feb 2009 17:54:09 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <1233761152.373.14.camel@localhost.localdomain>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>

About the hijacking - I *might* have done it without understanding what
I did (replied to a previous message and then changed the subject), if
that's what you mean...
Sorry

-----Original Message-----
From: python-list-bounces+noama=answers.com at python.org
[mailto:python-list-bounces+noama=answers.com at python.org] On Behalf Of
Albert Hopkins
Sent: Wednesday, February 04, 2009 5:26 PM
To: python-list at python.org
Subject: Re: Kill a function while it's being executed

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some
other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after
a
> certain amount of time has passed (without asking the user who's
giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a



--
http://mail.python.org/mailman/listinfo/python-list



From how at about.no.com  Wed Feb  4 10:55:32 2009
From: how at about.no.com (eviljonny)
Date: 04 Feb 2009 15:55:32 GMT
Subject: wsdl2py/ZSI and complex types with arrays
Message-ID: <4989ba74$0$24592$da0feed9@news.zen.co.uk>

Hello all,

I have been trying to write a web service using ZSI with wsdl2py. I have 
read 'The Zolera Soap Infrastructure User?s Guide Release 2.0.0' and some 
older guides (a guide by Nortel called Using ZSI with wsdl2py) and am 
unable to find any working examples of how to use arrays in complex 
types. I have a Request method which takes an array as an argument and 
responds with an array.

Assume I am just trying to write a client at this point. I have tried a 
lot of variations on this and can get a call made but using a tracefile 
the element SOIID is always empty no matter what I do.

Please excuse me if the code is not fantastic. I am very new to python.

#---------------------------------------
from GraphingReporter_services import *
from GraphingReporter_services_types import *

loc = GraphingReporterLocator()
fp = file("/tmp/PYTHON-TRACE","w")
port = loc.getGraphingReporterPort(tracefile=fp)

request = GraphRequestSOIID()
graphRequest = request.new_soiid()
graphRequest.Soiid = [123456,123457]
request.set_element_soiid(graphRequest)
response = port.GetGraphsForSOIID(request)

fp.close()
#---------------------------------------

The outgoing call in the trace shows 
#---------------------------------------
<SOAP-ENV:Body xmlns:ns1="urn:GraphingReporter">
<ns1:GetGraphsForSOIID>
<soiid></soiid>
</ns1:GetGraphsForSOIID>
</SOAP-ENV:Body>
#---------------------------------------

Can anyone provide me an example (or a link to an example) of how to 
populate the arrays in complex types? Even pointing me in the right 
direction would be wonderful.

-- 
EvilJonny


From nospam at nospam.com  Wed Feb  4 11:08:45 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Wed, 04 Feb 2009 17:08:45 +0100
Subject: [Web 2.0] Added-value of frameworks?
Message-ID: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>

Hello

If I wanted to build some social web site such as Facebook, what do
frameworks like Django or TurboGears provide over writing a site from
scratch using Python?

Thank you for your feedback.


From nospam at nospam.com  Wed Feb  4 11:11:07 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Wed, 04 Feb 2009 17:11:07 +0100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<mailman.8639.1233608458.3487.python-list@python.org>
Message-ID: <defjo4h89b144i65l3b2gvnio9nbtibor2@4ax.com>

On Mon, 2 Feb 2009 22:00:53 +0100, Martin <martin at marcher.name> wrote:
>as suggested, the DBA should seriously think about defining the
>correct type of the column here, for intermediate use and getting
>stuff to work you could use a view and define some stored procedures
>on it so that inserting properly works...

Right, but SQLite only has two types: Numeric or text, so I figured
it'd be better to turn dates into the usual YYYY-MM-DD before saving
data into an SQLite file.

Thanks for the feedback.


From tino at wildenhain.de  Wed Feb  4 11:19:13 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 17:19:13 +0100
Subject: len()
In-Reply-To: <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org> <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>
Message-ID: <4989C001.5040102@wildenhain.de>

Marco Mariani wrote:
> Pat wrote:
> 
>> Why didn't you answer the len() question?
> 
> It's a bit of a FAQ: len() cannot be a method of list objects because it 
> works on any sequence or iterable.

Thats only half of the truth :-)

len() can use some internal optimizations on certain objects
where sequences indeed have a len() method called __len__()

Regards
Tino
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From vincent at vincentdavis.net  Wed Feb  4 11:24:00 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 09:24:00 -0700
Subject: Use list name as string
Message-ID: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>

Do to laking knowledge my google searches have not turned up an answer for me.
I know this is wrong it uses the items in the list as the filename,
how do I refer to the dataname and not the items in it.

def savedata(dataname):
    filename = str(dataname)  # this does not do what I would like it to
    ext1 = '\.csv'
    flex = filename + ext1
    datawrite = csv.writer(open(flex, "wb"))
    datawrite.writerows(dataname)


Thanks
Vincent Davis


From mccredie at gmail.com  Wed Feb  4 11:30:38 2009
From: mccredie at gmail.com (Matimus)
Date: Wed, 4 Feb 2009 08:30:38 -0800 (PST)
Subject: Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <98d0397d-f707-4c09-94ad-11427d94930f@l33g2000pri.googlegroups.com>

On Feb 4, 8:08?am, Gilles Ganault <nos... at nospam.com> wrote:
> Hello
>
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?
>
> Thank you for your feedback.

Why not just look at the frameworks themselves and see what they have
to offer. Django and Turbogears both have pretty good tutorials. You
can be up and running in 20 minutes with each one. You be the judge.

The frameworks provide a lot of boilerplate code that I would rather
not write. They are probably more secure and scalable than something I
would come up with. You also get many extras for free. I think in both
of the frameworks you mention you get an administrative back end for
free. Other people have created apps/plugins that you can use with
those frameworks. So, for example, you might be able to borrow the
code to help you add a forum to your site.

I'm not sure I know the advantage of not using a framework. Unless "I
get to write more code" is an advantage. Creating your own framework
might be fun, but if you really just want a website don't do more work
than you need to.

Matt


From gherron at islandtraining.com  Wed Feb  4 11:35:32 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 04 Feb 2009 08:35:32 -0800
Subject: Use list name as string
In-Reply-To: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
Message-ID: <4989C3D4.4070303@islandtraining.com>

Vincent Davis wrote:
> Do to laking knowledge my google searches have not turned up an answer for me.
> I know this is wrong it uses the items in the list as the filename,
> how do I refer to the dataname and not the items in it.
>
> def savedata(dataname):
>     filename = str(dataname)  # this does not do what I would like it to
>     ext1 = '\.csv'
>     flex = filename + ext1
>     datawrite = csv.writer(open(flex, "wb"))
>     datawrite.writerows(dataname)
>
>   

I need more information to answer this question -- because I have no
idea what the question means.

SO:
  What is dataname?
  What would you like filename to be after that line.

One example of dataname and the desired filename is probably enough to
answer your question.
> Thanks
> Vincent Davis
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From catherine.heathcote at gmail.com  Wed Feb  4 11:47:04 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Wed, 04 Feb 2009 16:47:04 GMT
Subject: Couple of noobish question
Message-ID: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>

Firstly hi, I don't know any of you yet but am picking up Python and 
will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 
years of a comp tech degree, long story) and am learning Python, 'cos I 
saw some code and it just looks a really nice language to work with. I 
come from C++, so I am bound to trip up trying to do things the wrong way!

I have been working with Project Euler to get the hang of Python, and 
all goes well. I have an idea for a small project, an overly simplistic 
interactive fiction engine (well more like those old choose your own 
adventure books, used to love those!) that uses XML for its map files. 
The main issues I see so far is the XML parsing (I should pick that up 
ok, I have a blackbelt in google-foo), but more importantly splitting 
code files.

In C++ I would obviously split .cpp and .h files, pairing them up and 
using #include. How do I do this in Python? I see that you don't tend to 
split logic from defenition, but how do I keep different classes in 
different files? My google-fu fails me so far.


From python.list at tim.thechases.com  Wed Feb  4 11:48:16 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 10:48:16 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
Message-ID: <4989C6D0.2000604@tim.thechases.com>

> I know this is wrong it uses the items in the list as the filename,
> how do I refer to the dataname and not the items in it.

Without a sample value for "dataname", it's hard to tell what 
you're trying to do.  Do you mean

   dataname = ['path', 'to', 'file']
   ...
   filename = os.sep.join(dataname)

Or you have a list of one value, and just want its first item?

   filename = dataname[0]

> def savedata(dataname):
>	filename = str(dataname) # this does not do what I would like it to

It would help if you detailed what you *would* like it to do...

   >>> from MindReading import answer
   Traceback (most recent call last):
     File "<stdin>", line 6, in comp.lang.python
   ImportError: No module named MindReading

Similar failure attempting

   >>> import dwim

-tkc









From manu3d at gmail.com  Wed Feb  4 11:51:41 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 4 Feb 2009 08:51:41 -0800 (PST)
Subject: re.sub and named groups
Message-ID: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>

Hi everybody,

I'm having a ball with the power of regular expression but I stumbled
on something I don't quite understand:

theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
aReplacementPattern = "\(\?P<first>.*\)"
aReplacementString= "foo"
re.sub(aReplacementPattern , aReplacementString, theOriginalString)

results in :

"spam:foo"

instead, I was expecting:

"spam:foo ham:"

Why is that?

Thanks for your help!

Manu






From steve at holdenweb.com  Wed Feb  4 11:54:45 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 11:54:45 -0500
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>	<1233761152.373.14.camel@localhost.localdomain>
	<749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>
Message-ID: <gmch8p$kk1$1@ger.gmane.org>

Noam Aigerman wrote:
> About the hijacking - I *might* have done it without understanding what
> I did (replied to a previous message and then changed the subject), if
> that's what you mean...
> Sorry

That's what he meant. A lot of news reading and email software uses
In-Reply-To and various other message headers to determine how messages
are threaded, so (for example) in my Thunderbird Window this appears to
be a part of the thread that started out as "Locating Python".

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From vincent at vincentdavis.net  Wed Feb  4 11:57:13 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 09:57:13 -0700
Subject: Use list name as string
In-Reply-To: <4989C6D0.2000604@tim.thechases.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
Message-ID: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>

Sorry for not being clearI would have something like this
x = [1, 2, 3,5 ,6 ,9,234]

Then
def savedata(dataname): ..........

savedata(x)

this would save a to a file called x.csv This is my problem, getting the
name to be x.csv which is the same as the name of the list.

and the data in the file would be
1,2,3,5,6,9,234 this parts works

Thanks
Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 9:48 AM, Tim Chase <python.list at tim.thechases.com>wrote:

> I know this is wrong it uses the items in the list as the filename,
>> how do I refer to the dataname and not the items in it.
>>
>
> Without a sample value for "dataname", it's hard to tell what you're trying
> to do.  Do you mean
>
>  dataname = ['path', 'to', 'file']
>  ...
>  filename = os.sep.join(dataname)
>
> Or you have a list of one value, and just want its first item?
>
>  filename = dataname[0]
>
>  def savedata(dataname):
>>        filename = str(dataname) # this does not do what I would like it to
>>
>
> It would help if you detailed what you *would* like it to do...
>
>  >>> from MindReading import answer
>  Traceback (most recent call last):
>    File "<stdin>", line 6, in comp.lang.python
>  ImportError: No module named MindReading
>
> Similar failure attempting
>
>  >>> import dwim
>
> -tkc
>
>
>
>
>
>
>
>
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From kyosohma at gmail.com  Wed Feb  4 12:05:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 4 Feb 2009 09:05:16 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>

On Feb 4, 10:47?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> Firstly hi, I don't know any of you yet but am picking up Python and
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
> years of a comp tech degree, long story) and am learning Python, 'cos I
> saw some code and it just looks a really nice language to work with. I
> come from C++, so I am bound to trip up trying to do things the wrong way!
>
> I have been working with Project Euler to get the hang of Python, and
> all goes well. I have an idea for a small project, an overly simplistic
> interactive fiction engine (well more like those old choose your own
> adventure books, used to love those!) that uses XML for its map files.
> The main issues I see so far is the XML parsing (I should pick that up
> ok, I have a blackbelt in google-foo), but more importantly splitting
> code files.
>
> In C++ I would obviously split .cpp and .h files, pairing them up and
> using #include. How do I do this in Python? I see that you don't tend to
> split logic from defenition, but how do I keep different classes in
> different files? My google-fu fails me so far.

You just use the keyword "import". Here's a goofy example:

1) foo.py contains a class called Foo
2) bar.py contains a script that imports Foo:

import foo

# create an instance of the Foo class
myFoo = foo.Foo()


I hope that was clear.

Mike


From google at mrabarnett.plus.com  Wed Feb  4 12:07:19 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:07:19 +0000
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <4989CB47.3060806@mrabarnett.plus.com>

Vincent Davis wrote:
 > Sorry for not being clear I would have something like this x = [1, 2,
 > 3,5 ,6 ,9,234]
 >
 > Then def savedata(dataname): ..........
 >
 > savedata(x)
 >
 > this would save a to a file called x.csv This is my problem, getting
 > the name to be x.csv which is the same as the name of the list.
 >
 > and the data in the file would be 1,2,3,5,6,9,234 this parts works
 >
The list itself doesn't have a name. You need to pass in both the name
and the list:

def savedata(name, data): ..........

savedata("x", x)


From catherine.heathcote at gmail.com  Wed Feb  4 12:09:54 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Wed, 04 Feb 2009 17:09:54 GMT
Subject: Couple of noobish question
In-Reply-To: <c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>
Message-ID: <CZjil.30234$Sp5.22514@text.news.virginmedia.com>

Mike Driscoll wrote:
> On Feb 4, 10:47 am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> Firstly hi, I don't know any of you yet but am picking up Python and
>> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
>> years of a comp tech degree, long story) and am learning Python, 'cos I
>> saw some code and it just looks a really nice language to work with. I
>> come from C++, so I am bound to trip up trying to do things the wrong way!
>>
>> I have been working with Project Euler to get the hang of Python, and
>> all goes well. I have an idea for a small project, an overly simplistic
>> interactive fiction engine (well more like those old choose your own
>> adventure books, used to love those!) that uses XML for its map files.
>> The main issues I see so far is the XML parsing (I should pick that up
>> ok, I have a blackbelt in google-foo), but more importantly splitting
>> code files.
>>
>> In C++ I would obviously split .cpp and .h files, pairing them up and
>> using #include. How do I do this in Python? I see that you don't tend to
>> split logic from defenition, but how do I keep different classes in
>> different files? My google-fu fails me so far.
> 
> You just use the keyword "import". Here's a goofy example:
> 
> 1) foo.py contains a class called Foo
> 2) bar.py contains a script that imports Foo:
> 
> import foo
> 
> # create an instance of the Foo class
> myFoo = foo.Foo()
> 
> 
> I hope that was clear.
> 
> Mike

Perfect, thanks ^^


From google at mrabarnett.plus.com  Wed Feb  4 12:17:54 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:17:54 +0000
Subject: re.sub and named groups
In-Reply-To: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <4989CDC2.7010001@mrabarnett.plus.com>

Emanuele D'Arrigo wrote:
 > Hi everybody,
 >
 > I'm having a ball with the power of regular expression but I stumbled
 > on something I don't quite understand:
 >
 > theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
 > aReplacementPattern = "\(\?P<first>.*\)"
 > aReplacementString= "foo"
 > re.sub(aReplacementPattern , aReplacementString, theOriginalString)
 >
 > results in :
 >
 > "spam:foo"
 >
 > instead, I was expecting:
 >
 > "spam:foo ham:"
 >
 > Why is that?
 >
 > Thanks for your help!
 >
The quantifiers eg "*" are normally greedy; they try to match as much as
possible. Therefore ".*" matches:

spam:(?P<first>.*) ham:(?P<second>.*)
                ^^^^^^^^^^^^^^^^^^^^^

You could use the lazy form "*?" which tries to match as little as
possible, eg "\(\?P<first>.*?\)" where the ".*?" matches:

spam:(?P<first>.*) ham:(?P<second>.*)
                ^^

giving "spam:foo ham:(?P<second>.*)".


From vincent at vincentdavis.net  Wed Feb  4 12:18:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:18:49 -0700
Subject: Use list name as string
In-Reply-To: <4989CB47.3060806@mrabarnett.plus.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
Message-ID: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>

I know nothing but that sucks. I can think of a lot of times I would like to
do something similar. There really is no way to do this, it seems like there
would be some simple way kind of like str(listname) but backwards or
different.
Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:

> Vincent Davis wrote:
> > Sorry for not being clear I would have something like this x = [1, 2,
> > 3,5 ,6 ,9,234]
> >
> > Then def savedata(dataname): ..........
> >
> > savedata(x)
> >
> > this would save a to a file called x.csv This is my problem, getting
> > the name to be x.csv which is the same as the name of the list.
> >
> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
> >
> The list itself doesn't have a name. You need to pass in both the name
> and the list:
>
> def savedata(name, data): ..........
>
> savedata("x", x)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From manu3d at gmail.com  Wed Feb  4 12:23:45 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 4 Feb 2009 09:23:45 -0800 (PST)
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<mailman.8785.1233767871.3487.python-list@python.org>
Message-ID: <97ab8831-97ab-4d05-8fd3-90ac17f04bd1@x16g2000prn.googlegroups.com>

On Feb 4, 5:17?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> You could use the lazy form "*?" which tries to match as little as
> possible, eg "\(\?P<first>.*?\)" where the ".*?" matches:
> spam:(?P<first>.*) ham:(?P<second>.*)
> giving "spam:foo ham:(?P<second>.*)".

A-ha! Of course! That makes perfect sense! Thank you! Problem solved!

Ciao!

Manu



From vincent at vincentdavis.net  Wed Feb  4 12:23:55 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:23:55 -0700
Subject: Use list name as string
In-Reply-To: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
Message-ID: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>

I guess what I am saying is that it does not seem like I am adding any
information that is not already there when I have to enter that list and
list name after all they are the same.
Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I know nothing but that sucks. I can think of a lot of times I would like
> to do something similar. There really is no way to do this, it seems like
> there would be some simple way kind of like str(listname) but backwards or
> different.
> Thanks
> Vincent Davis
>
>
>
>
> On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>> > Sorry for not being clear I would have something like this x = [1, 2,
>> > 3,5 ,6 ,9,234]
>> >
>> > Then def savedata(dataname): ..........
>> >
>> > savedata(x)
>> >
>> > this would save a to a file called x.csv This is my problem, getting
>> > the name to be x.csv which is the same as the name of the list.
>> >
>> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
>> >
>> The list itself doesn't have a name. You need to pass in both the name
>> and the list:
>>
>> def savedata(name, data): ..........
>>
>> savedata("x", x)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From gherron at islandtraining.com  Wed Feb  4 12:26:28 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 04 Feb 2009 09:26:28 -0800
Subject: Couple of noobish question
In-Reply-To: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <4989CFC4.6090305@islandtraining.com>

Catherine Heathcote wrote:
> Firstly hi, I don't know any of you yet but am picking up Python and
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
> years of a comp tech degree, long story) and am learning Python, 'cos
> I saw some code and it just looks a really nice language to work with.
> I come from C++, so I am bound to trip up trying to do things the
> wrong way!

Welcome.  I suspect you'll enjoy Python.  (Far more than C++ ).
>
> I have been working with Project Euler to get the hang of Python, and
> all goes well. I have an idea for a small project, an overly
> simplistic interactive fiction engine (well more like those old choose
> your own adventure books, used to love those!) that uses XML for its
> map files. The main issues I see so far is the XML parsing (I should
> pick that up ok, I have a blackbelt in google-foo), but more
> importantly splitting code files.

Several modules exits to do the parsing of XML:  elementtree, xml, and
beautifulsoup come to mind immediately.
>
> In C++ I would obviously split .cpp and .h files, pairing them up and
> using #include. How do I do this in Python? I see that you don't tend
> to split logic from defenition, but how do I keep different classes in
> different files? My google-fu fails me so far.

Use the import statement for this.

If file a.py defines some classes or functions
a.py:
  class UsefulClass:
    ...
  def UsefulFn(...):
    ...

Then your main Python file imports it and uses the things define in a.py
like this:
  import a
  ob = UsefulClass(...)
  a.UsefulFn()

Good luck,

Gary Herron


> -- 
> http://mail.python.org/mailman/listinfo/python-list



From vincent at vincentdavis.net  Wed Feb  4 12:31:38 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:31:38 -0700
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>

can I do it the otherway, that issavedata('nameoflist')


Thanks
Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 10:23 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I guess what I am saying is that it does not seem like I am adding any
> information that is not already there when I have to enter that list and
> list name after all they are the same.
> Thanks
> Vincent Davis
>
>
>
>
> On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> I know nothing but that sucks. I can think of a lot of times I would like
>> to do something similar. There really is no way to do this, it seems like
>> there would be some simple way kind of like str(listname) but backwards or
>> different.
>> Thanks
>> Vincent Davis
>>
>>
>>
>>
>> On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:
>>
>>> Vincent Davis wrote:
>>> > Sorry for not being clear I would have something like this x = [1, 2,
>>> > 3,5 ,6 ,9,234]
>>> >
>>> > Then def savedata(dataname): ..........
>>> >
>>> > savedata(x)
>>> >
>>> > this would save a to a file called x.csv This is my problem, getting
>>> > the name to be x.csv which is the same as the name of the list.
>>> >
>>> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
>>> >
>>> The list itself doesn't have a name. You need to pass in both the name
>>> and the list:
>>>
>>> def savedata(name, data): ..........
>>>
>>> savedata("x", x)
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>
>>
>
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From cjw at ncf.ca  Wed Feb  4 12:32:41 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Wed, 04 Feb 2009 12:32:41 -0500
Subject: Date Comparison
In-Reply-To: <gm9idp02h1t@news4.newsguy.com>
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<gm9idp02h1t@news4.newsguy.com>
Message-ID: <gmcjfs$63m$1@theodyn.ncf.ca>

Bill McClain wrote:
> On 2009-02-03, mohana2004 at gmail.com <mohana2004 at gmail.com> wrote:
>> Hi,
>> I need to compare two dates and find the number of days between those
>> two dates.This can be done with datetime module in python  as below,
>> but this is not supported in Jython.
> 
> There are julian day routines in this astronomy package:
> 
>     http://astrolabe.sourceforge.net/
and in Mark Lemburg's mxDate

Colin W.
> 
> -Bill


From python.list at tim.thechases.com  Wed Feb  4 12:35:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 11:35:29 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
Message-ID: <4989D1E1.8090008@tim.thechases.com>

> I know nothing but that sucks. I can think of a lot of times I would like to
> do something similar. There really is no way to do this, it seems like there
> would be some simple way kind of like str(listname) but backwards or
> different.

Python does the only reasonable thing:  doesn't give you access 
to the "name".  Consider the following situation:

   a = [1,2,3,4,5]
   b = a

   savedata(b)

Do you want "a" or "b" as the variable-name?  Both are valid 
names for the same list.

If it matters, you can do something like this hack:

   def savedata(**kwargs):
     assert len(kwargs) == 1, "Just pass one parameter"
     filename, data = kwargs.iteritems().next()
     ext1 = '\.csv'
     flex = filename + ext1
     datawrite = csv.writer(open(flex, "wb"))
     datawrite.writerows(data)

which can then be called with something like

   savedata(foo=[1,2,3,4,5])
   savedata(bar=a)
   savedata(name=name)

to create "foo.csv" containing that data.

Or you could just pass it explicitly which would make more sense 
and be easier to understand.

-tkc






From sebastien.yapo at free.fr  Wed Feb  4 12:36:56 2009
From: sebastien.yapo at free.fr (=?ISO-8859-1?Q?Yapo_S=E9bastien?=)
Date: Wed, 04 Feb 2009 18:36:56 +0100
Subject: re.sub and named groups
In-Reply-To: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <4989D238.6000702@free.fr>


> Hi everybody,
>
> I'm having a ball with the power of regular expression but I stumbled
> on something I don't quite understand:
>
> theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
> aReplacementPattern = "\(\?P<first>.*\)"
> aReplacementString= "foo"
> re.sub(aReplacementPattern , aReplacementString, theOriginalString)
>
> results in :
>
> "spam:foo"
>
> instead, I was expecting:
>
> "spam:foo ham:"
>
> Why is that?
>
> Thanks for your help!
>
> Manu
>
>   
I think that .* in your replacement pattern matches ".*)
ham:(?P<second>.*" in your original string which seems correct for a regexp.
Perhaps you should try aReplacementPattern = "\(\?P<first>\.\*\)" or use
replace() since your replacement pattern is not a regexp anymore.

Sebastien


From python.list at tim.thechases.com  Wed Feb  4 12:46:13 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 11:46:13 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>
Message-ID: <4989D465.6070402@tim.thechases.com>

> can I do it the otherway, that issavedata('nameoflist')

for limited cases where your variable is defined globally, you 
can use:

   >>> a = [1,2,3,4]
   >>> def save(s):
   ...     print globals().get(s, "UNDEFINED")
   ...
   >>> save("a")
   [1, 2, 3, 4]
   >>> save("b")
   UNDEFINED
   >>> b = (6,5,4,3)
   >>> save("b")
   (6, 5, 4, 3)

However, it's a hideous hack, and fragile as demonstrated by

   >>> x = 7000
   >>> def baz():
   ...     x = (7,8,9) # this isn't in save()'s globals()
   ...     save("x")
   ...
   >>> baz()
   7000
   >>> x = 8000
   >>> baz()
   8000

and using locals() doesn't help either:

   print locals().get(s, globals().get(s, "UNDEFINED"))

and has even weirder (but totally understandable) behavior:

   >>> save("s")  # "s" hasn't been defined in globals()
   's'

Just pass the filename as a string, and skip trying to sniff 
internal variable-names.  Or you'll experience a world of headaches.

-tkc






From google at mrabarnett.plus.com  Wed Feb  4 12:49:57 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:49:57 +0000
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <4989D545.4030409@mrabarnett.plus.com>

Vincent Davis wrote:
> I guess what I am saying is that it does not seem like I am adding
> any information that is not already there when I have to enter that
> list and list name after all they are the same.
> 
If you write:

y = x

then both x and y refer to the same list.

The actual names of the variables and functions shouldn't matter to the
outside world; the name of an output file shouldn't depend on the name
of a variable.

 > On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis
 > <vincent at vincentdavis.net <mailto:vincent at vincentdavis.net>> wrote:
 >
 >     I know nothing but that sucks. I can think of a lot of times I
 >     would like to do something similar. There really is no way to do
 >     this, itseems like there would be some simple way kind of like
 >     str(listname)but backwards or different.
 >
 >     On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com
 >     <mailto:google at mrabarnett.plus.com>> wrote:
 >
 >         Vincent Davis wrote:
 >          > Sorry for not being clear I would have something like this
 >          x = [1, 2, 3,5 ,6 ,9,234]
 >          >
 >          > Then def savedata(dataname): ..........
 >          >
 >          > savedata(x)
 >          >
 >          > this would save a to a file called x.csv This is my
 >          > problem,getting the name to be x.csv which is the same as
 >          > the name of the list.
 >          >
 >          > and the data in the file would be 1,2,3,5,6,9,234 this
 >          >  parts works
 >          >
 >         The list itself doesn't have a name. You need to pass in both
 >         the name and the list:
 >
 >         def savedata(name, data): ..........
 >
 >         savedata("x", x)
 >


From rdmurray at bitdance.com  Wed Feb  4 13:12:48 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 18:12:48 +0000 (UTC)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <gmclr0$650$1@ger.gmane.org>

Quoth Catherine Heathcote <catherine.heathcote at gmail.com>:
> all goes well. I have an idea for a small project, an overly simplistic 
> interactive fiction engine (well more like those old choose your own 
> adventure books, used to love those!) that uses XML for its map files. 
> The main issues I see so far is the XML parsing (I should pick that up 
> ok, I have a blackbelt in google-foo), but more importantly splitting 

Others have answered your other question, but I thought I'd mention
that you will probably want to take a look at the ElementTree module.

--RDM



From shiningsandy at gmail.com  Wed Feb  4 13:27:26 2009
From: shiningsandy at gmail.com (sandeep)
Date: Wed, 4 Feb 2009 10:27:26 -0800 (PST)
Subject: Running CVSNT commands from python to Automate the job
Message-ID: <e4b7e815-9e87-4af0-afe9-60148345a938@35g2000pry.googlegroups.com>

Hi All,

i want to automate my task for of doing cvs checkout for different
modules. I am on Windows XP and i am using Python 2.6. here is my
attched python code. The thing is when i am running this nothing is
happening. I am not sure at which end the problem is. am i giving
wrong parameters or what? any help or pointers to write directions
will be helpfull.

CVS_PATH='C:\Program Files\CVSNT\cvs.exe'
CVS_PATH=(os.sep).join(CVS_PATH.split('\\'))
BRANCH_NAME='B_PKG14_01'
'''

Filters the directories only from the list of files
and directories excluding the directories starting with name '.'
@param dirList=List of all the files and directories
@param basePath=path where we are doing our filtering

'''
def filterDir(dirList,basePath):
    import os
    temp=[]
    for data in dirList:
        #if(data[0]!='.'):
        mydir=os.path.join(basePath,data)
        flag=os.path.isdir(mydir)
        if(flag==True):
            temp.append(mydir)
    return temp

def main():
    import os

    curr_dir=os.getcwd()#current working directory
    curr_list=os.listdir(curr_dir)#list of all files and directories
in current working directory
    global CVS_PATH,BRANCH_NAME
    temp=filterDir(curr_list,curr_dir)

    for mydir in temp:
        dir_name=os.path.split(mydir)[1]
        #os.rmdir(mydir)
        CVS_COMMAND='checkout -r '+BRANCH_NAME+' -P '+dir_name
        print '"'+CVS_PATH+'"'+' -q '+CVS_COMMAND

main()



thanks,
sandeep


From james at agentultra.com  Wed Feb  4 13:36:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 04 Feb 2009 18:36:12 +0000
Subject: Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
	<98d0397d-f707-4c09-94ad-11427d94930f@l33g2000pri.googlegroups.com>
Message-ID: <878wom6odf.fsf@agentultra.com>

Matimus <mccredie at gmail.com> writes:

> On Feb 4, 8:08?am, Gilles Ganault <nos... at nospam.com> wrote:
>> Hello
>>
>> If I wanted to build some social web site such as Facebook, what do
>> frameworks like Django or TurboGears provide over writing a site from
>> scratch using Python?
>>
>> Thank you for your feedback.
>
> Why not just look at the frameworks themselves and see what they have
> to offer. Django and Turbogears both have pretty good tutorials. You
> can be up and running in 20 minutes with each one. You be the judge.
>
> The frameworks provide a lot of boilerplate code that I would rather
> not write. They are probably more secure and scalable than something I
> would come up with. You also get many extras for free. I think in both
> of the frameworks you mention you get an administrative back end for
> free. Other people have created apps/plugins that you can use with
> those frameworks. So, for example, you might be able to borrow the
> code to help you add a forum to your site.
>
> I'm not sure I know the advantage of not using a framework. Unless "I
> get to write more code" is an advantage. Creating your own framework
> might be fun, but if you really just want a website don't do more work
> than you need to.
>
> Matt

In other words, it boils down to what you get paid to do.

If you're being paid for a frob (the product, in this case a website)
then you use a frob-maker (a framework).

If you're being paid to make frobs, then you make the frob-maker.

Most frob-makers are good at producing frobs of a certain kind. Just
choose the frob-maker that makes the frobs you need.

In rare circumstances you'll need a really customized frob. Call on me
when you get there. ;)


From gagsl-py2 at yahoo.com.ar  Wed Feb  4 13:50:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 16:50:17 -0200
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>
	<gm254n$14l$1@aioe.org> <20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>
Message-ID: <op.uoubx3bxx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 12:38:04 -0200, Pat <Pat at junk.net> escribi?:
> Andreas Waldenburger wrote:
>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>> Tobiah wrote:
>>>> Just out of curiosity, why was len() made to
>>>> be it's own function?  I often find myself
>>>> typing things like my_list.len before I
>>>> catch myself.

>>> I'm surprised that no one responded to that question.
>>>
>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>> Might it be that your newsserver is a bit laggy?
>
> Might be laggy.  Who knows.
> Why didn't you answer the len() question?

Why should he? Why didn't you look for the answer yourself, after being  
told that it existed? Why do you expect *us* to repeat ourselves again and  
again? Don't be so lazy...

You can read all these posts using the mailing list  
(python-list at python.org), Usenet (comp.lang.python), Google Groups, and  
many other mirrors. See this same thread in 3 different ways:

Google groups:
http://groups.google.com/group/comp.lang.python/t/247ec641c289a326/

Gmane:
http://permalink.gmane.org/gmane.comp.python.general/608346

Python.org:
http://mail.python.org/pipermail/python-list/2009-January/526500.html

and many others, like the "forum" look & feel provided by  
www.velocityreviews.com

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb  4 13:57:55 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 16:57:55 -0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8728.1233694656.3487.python-list@python.org>
	<49895a45$0$16900$426a74cc@news.free.fr>
Message-ID: <op.uoucatxlx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 07:05:22 -0200, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> escribi?:
> Gabriel Genellina a ?crit :
>> En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com>  
>> escribi?:
>>
>>> Suppose a library developer (or a module developer on a large team)
>>> uses leading underscores. Now suppose that, for whatever reason
>>> (pressure from the users, perhaps), the library developer decides to
>>> change a "private" attribute to public. Now all occurrences of the
>>> identifier need to be changed. If an assignment to the previously
>>> "private" attribute is missed, no warning will be issued (because
>>> Python allows new attributes to be added anywhere, even completely
>>> outside the class definition itself). And if the library is widely
>>> used, the probability of such bugs occurring is very high.
>>  So _foo becomes foo. Then:
>>  class X(object):
>>     def get_foo(self): return self._foo
>>     def set_foo(self, value): self._foo = value
>>     foo = property(get_foo, set_foo)
>
>
> FWIW, if there's no other need for the property, I'd do it the other way  
> round : directly make foo a plain attribute, and add a _foo property  
> whose accessors would raise a deprecation warning. Then there's no  
> chance I miss a an assignement to _foo !-)

Yes, that would be better. In any case, one has both static analysis tools  
(e.g. pylint) and dynamic warnings (like you said above) so I don't see a  
problem here.

-- 
Gabriel Genellina



From tjreedy at udel.edu  Wed Feb  4 14:06:33 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 14:06:33 -0500
Subject: is python Object oriented??
In-Reply-To: <01a901c9869c$628e8fa0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de><mailman.8682.12336484
	28.3487.python-list@python.org>	<Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>
	<01a901c9869c$628e8fa0$0d00a8c0@hendrik>
Message-ID: <gmcovl$hmj$1@ger.gmane.org>

Hendrik van Rooyen wrote:
> "Scott David Daniels" <S...els at Acm.Org> wrote:
> 
>> You might enjoy looking at QNX, since I think it is built along the
>> lines you are describing here.  I have an ancient copy of their OS,
>> but haven't followed for more than couple of decades.
> 
> I vaguely know about it, and I know they claim to be hot on 
> real time stuff.  I have never pursued it in any depth because
> of the real tiny nature of the processors I have been working
> with (8031).
> 
> When I had a cursory look at it a long time ago, it seemed
> to be almost unix like in its make up, and I doubted that
> I could persuade it to run on of them. (I may be dead 
> wrong of course - I don't know)
> 
> I will put it on my list of stuff to try to get done.  

Slightly OT: QNX was open-sourced, at least for non-commercial use, a 
little more that a year ago.  So it might be worth a new look.



From tjreedy at udel.edu  Wed Feb  4 14:11:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 14:11:20 -0500
Subject: len()
In-Reply-To: <gmc979$b9r$1@aioe.org>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>
Message-ID: <gmcp8k$hmj$2@ger.gmane.org>

Pat wrote:
> Andreas Waldenburger wrote:
>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>
>>> Tobiah wrote:
>>>> Just out of curiosity, why was len() made to
>>>> be it's own function?  I often find myself
>>>> typing things like my_list.len before I
>>>> catch myself.
>>>>
>>>> Thanks,
>>>>
>>>> Toby
>>> I'm surprised that no one responded to that question.
>>>
>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>> Might it be that your newsserver is a bit laggy?
>>
>> regards
>> /W
>>
> 
> Might be laggy.  Who knows.
> 
> Why didn't you answer the len() question?

I didn't respond because it has been asked and answered before, so the 
answer can be found in the google archives or even maybe the FAQ.



From digitig at gmail.com  Wed Feb  4 14:18:25 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 19:18:25 +0000
Subject: sys.float_info.epsilon
Message-ID: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>

I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
and I'm puzzled by some of his uses of sys.float_info.epsilon. I
appreciate the issues of comparing floating point numbers, but I'm
puzzled by code like:
    ...
    x = float(input(msg))
    if abs(x) < sys.float_info.epsilon:
        ...

What could the float() conversion return that would give different results for:
    if abs(x) < sys.float_info.epsilon
and (to my mind, more obvious):
    if abs(x) == 0.0

I didn't realise that float() could return anything with an absolute
value less than sys.float_value.epsilon other than 0.0 (which I think
all representations can represent exactly).  What am I missing here?

-- 
Tim Rowe


From bockman at virgilio.it  Wed Feb  4 14:33:10 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Wed, 04 Feb 2009 20:33:10 +0100
Subject: Tkinter
In-Reply-To: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
Message-ID: <4989ed76$0$1117$4fafbaef@reader1.news.tin.it>

Luke ha scritto:
> Hello, I'm an inexperienced programmer and I'm trying to make a
> Tkinter window and have so far been unsuccessful in being able to
> delete widgets from the main window and then add new ones back into
> the window without closing the main window.
> 
> The coding looks similar to this:
> 
...


> It may just be bad coding but either way I could use some help.
> 
> Thanks


I fixed your code to do what you want, although I have no idea why you 
want it...

The main change is that you need to place the code to be executed when 
the button is clicked in a different function, and use the name of that
function as value of the on_command property of the button. Then you 
need to give back the control to Tkinter, calling the mainloop function
and when the button is clicked, your function is called.
This sort of ping-pong is called event-driven programming, and it is how 
most GUI toolkit work. The functions called when a GUI event occurs are 
called callbacks.

A secondary thing is that since both the main function and the callback 
read and change some 'variable' pointing to the widgets, you need to 
share them using python 'global' statement. Now, a better way to do it
would be incapsulate all in a class, but I wanted to stay as much as 
possible close to your code.

Finally, if you plan to to something that requires to dynamically create 
and destroy - or move arounds - graphical objects (not widgets), you 
might want to  have a look to the 'Canvas' widget.

Code follows after signature. Since the frame and the button are 
recreated just after having been destroyed, you just see them flicker.

Ciao
----
FB


--------------------------------------------

#
# Module-level variables referring to widgets
# used/changed by more than one function
#
back_ground = None
frame1 = None


def make_frame_and_button():
     global frame1, back_ground
     print 'background', back_ground
     frame1=Frame(back_ground,width=213,height=480,bg='white')
     print 'Frame1',  frame1
     frame1.pack_propagate(0)
     frame1.pack(side=TOP,anchor=N)
     frame1.pack_propagate(0)
     frame1.pack(side=TOP,anchor=N)
     close_frame1=Button(frame1,text='close', bg='blue',
                         command=on_close_button )
     print 'close_frame1', close_frame1
     close_frame1.pack_propagate(0)
     close_frame1.pack(side=TOP, anchor=N,pady=25)


def on_close_button():
     global frame1
     frame1.destroy()
     make_frame_and_button()


def MainWin():
     global back_ground, frame1
     main=Tk()
     main.geometry('640x480')
     back_ground=Frame(main,width=640,height=480,bg='black')
     back_ground.pack_propagate(0)
     back_ground.pack(side=TOP,anchor=N)
     make_frame_and_button()
     main.mainloop()


MainWin()


From martin at v.loewis.de  Wed Feb  4 14:37:21 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 04 Feb 2009 20:37:21 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <4989ee71$0$3356$9b622d9e@news.freenet.de>

> Is it the
> x64 working faster at its design sizes

Another guess (still from the darkness of not having received the
slightest clue what the test actually does): if it creates integers
in range(2**32, 2**64), then they fit into a Python int on AMD64-Linux,
but require a Python long on 32-bit Windows; long operations are much
slower than int operations.

Regards,
Martin


From Scott.Daniels at Acm.Org  Wed Feb  4 14:37:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 11:37:43 -0800
Subject: Tkinter
In-Reply-To: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
Message-ID: <gcidnWzqds6EcxTUnZ2dnUVZ_oOdnZ2d@pdx.net>

Luke wrote:
> Hello, I'm an inexperienced programmer and I'm trying to make a
> Tkinter window and have so far been unsuccessful in being able to
> delete widgets from the main window and then add new ones back into
> the window without closing the main window.
> 
> The coding looks similar to this:
> ...
> from Tkinter import *
> def MainWin():
>     main=Tk()
>     ...
>     close_frame1=Button(frame1,text='close',bg='light gray',
> command=frame1.destroy)
>     close_frame1.pack_propagate(0)
>     close_frame1.pack(side=TOP, anchor=N,pady=25)
>     if frame1.destroy==True:
>         frame1=Frame(back_ground,width=213,height=480,bg='white')
>         frame1.pack_propagate(0)
>         frame1.pack(side=TOP,anchor=N)
>     main.mainloop()
> MainWin()
> 
> It may just be bad coding but either way I could use some help.


I'll tell you what I find helps me in exploring Tkinter: running
Idle in the "no-subprocesses" mode.  Now the resulting system _is_
less stable and may well require you to restart from time to time,
but there is a compensation: you can see the effect of each
operation as you do it by hand, as well as checking expressions:

If in Windows:
     run cmd
     C:\> python -m idlelib.idle -n

If in Linux / MacOSx:
     Start a terminal:
     $ python  -m idlelib.idle -n &

Once idle shows up,
     >>> import Tkinter
     >>> main = Tkinter.Tk()
<a window shows up>
       ...

Following through your code, you'll see you start the frame,
add the button, and, immediately after getting everything set
up, you check:
 >     if frame1.destroy==True:
Which it will never be (frame1.destroy is a method, not data).
Once you get the base set up, your code should runfrom events.

So, to get a single step farther:
At the top of the MainWin function, insert:
     global frame1, close_frame1
Replace your "close_frame1 =" line down to end-o-function with:
     def on_click():
         global frame1, close_frame1
         frame1.destroy()
         frame1 =Frame(back_ground,width=213,height=480,bg='white')
         frame1.pack_propagate(0)
         frame1.pack(side=TOP,anchor=N)
         close_frame1 = Button(frame1,text='retry', bg='light blue',
                               command=on_click)
         close_frame1.pack_propagate(0)
         close_frame1.pack(side=TOP, anchor=N,pady=25)
     close_frame1 = Button(frame1,text='close',bg='light gray',
                                     command=on_click)
     close_frame1.pack_propagate(0)
     close_frame1.pack(side=TOP, anchor=N,pady=25)

The "global" lines are needed so that on_click and MainWin (which both
set the two names) are talking about the same objects.

--Scott David Daniels
Scott.Daniels at Acm.Org


From thmpsn.m.k at gmail.com  Wed Feb  4 14:49:32 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Wed, 4 Feb 2009 11:49:32 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<49895bad$0$28683$426a74cc@news.free.fr>
Message-ID: <5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>

On Feb 4, 3:11?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> thmpsn.... at gmail.com a ?crit :
>
>
>
> > On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
> (snip)
> >> after all, we have used FILE* for years and I have no idea about the FILE
> >> structure.
>
> > Your lack of knowledge about it doesn't mean that it has somehow
> > magically "private" members. The only reason that most of us don't
> > know what a FILE is is that it's definition is implementation-defined
> > (i.e., every compiler may define it differently).
>
> > That doesn't have anything to do with private members. For example, on
> > my system, <stdio.h> defines FILE as:
>
> > struct _iobuf {
> > ? ? ? ? char *_ptr;
> > ? ? ? ? int ? _cnt;
> > ? ? ? ? char *_base;
> > ? ? ? ? int ? _flag;
> > ? ? ? ? int ? _file;
> > ? ? ? ? int ? _charbuf;
> > ? ? ? ? int ? _bufsiz;
> > ? ? ? ? char *_tmpfname;
> > ? ? ? ? };
>
> Didn't you notice kind of a pattern here ?

You mean the leading underscores? I don't think they're used for the
same purpose as in Python. In C/C++, identifiers that begin with an
underscore are reserved (at least at the outer level). Thus, if the
member '_ptr' would instead be named 'ptr', something like this would
break things:

#define ptr // OOPS!!
#include <stdio.h>

That shouldn't happen with '_ptr', since programs are not supposed to
define those kinds of names (yeah, right).

> > typedef struct _iobuf FILE;
>
> > Given this information, nothing prevents me from writing things like:
>
> > FILE* fp = fopen("file.txt", "r");
> > if (!fp) { /* do something */ }
>
> > printf("fp->_cnt = %d\n", fp->cnt);
> > printf("fp->_flag = %d\n", fp->_flag);
> > printf("fp->_file = %d\n", fp->_file);
>
> > fp->_flag = 0x20; // OOPS!!
>
> Indeed - and that's exactly the point : nothing prevents you from
> accessing the implementation, *and yet, you don't*

I sure don't, but I still *can*.

CHAOS MAY ENSUE!!



From Scott.Daniels at Acm.Org  Wed Feb  4 14:52:11 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 11:52:11 -0800
Subject: sys.float_info.epsilon
In-Reply-To: <mailman.8799.1233775108.3487.python-list@python.org>
References: <mailman.8799.1233775108.3487.python-list@python.org>
Message-ID: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>

Tim Rowe wrote:
> I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
> and I'm puzzled by some of his uses of sys.float_info.epsilon. I
> appreciate the issues of comparing floating point numbers, but I'm
> puzzled by code like:
>     ...
>     x = float(input(msg))
>     if abs(x) < sys.float_info.epsilon:
>         ...
> 
> What could the float() conversion return that would give different results for:
>     if abs(x) < sys.float_info.epsilon
> and (to my mind, more obvious):
>     if abs(x) == 0.0
> 
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly).  What am I missing here?
> 

You are missing the whole thing that mes floating point tricky.
I _believe_ that the epsilon is the smallest positive x such that
    1.0 != 1.0 + x
That doesn't mean that x is the smallest representable. for example,
    .0125 + epsilon / 4 != .0125

To avoid using epsilon, do something like:
     if 1 + abs(x) != 1:

To learn a bit more, look into numerical analysis -- there is a whole
field dedicated to figuring out how to make floating point behave a
little bit like real numbers.  The reason it is tough is that addition
is not associative in real numbers, and associativity is at the core
of a lot of proofs in arithmetic (and group theory).

--Scott David Daniels
Scott.Daniels at Acm.Org


From dickinsm at gmail.com  Wed Feb  4 14:57:20 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 4 Feb 2009 11:57:20 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org>
Message-ID: <42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>

On Feb 4, 7:18?pm, Tim Rowe <digi... at gmail.com> wrote:
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly). ?What am I missing here?

There are many positive floating-point values smaller than
sys.float_info.epsilon.

sys.float_info.epsilon is defined as the difference between 1.0 and
the next largest representable floating-point number.  On your system,
the next largest float is almost certainly 1 + 2**-52, so
sys.float_info.epsilon will be exactly 2**-52, which is around
2.2e-16.  This number is a good guide to the relative error
from rounding that you can expect from a basic floating-point
operation.

The smallest positive floating-point number is *much* smaller:
again, unless you have a very unusual platform, it's going to
be 2**-1074, or around 4.9e-324.  In between 2**-1074 and
2**-52 there are approximately 4.4 million million million
different floating-point numbers.  Take your pick!

If you want a specific example, how about float('6.626e-34').

Mark


From stefan_ml at behnel.de  Wed Feb  4 15:02:52 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 04 Feb 2009 21:02:52 +0100
Subject: Using lxml to screen scrap a site, problem with charset
In-Reply-To: <gm7bfl$vf8$1@foggy.unx.sas.com>
References: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>
	<gm7bfl$vf8$1@foggy.unx.sas.com>
Message-ID: <4989f46c$0$31338$9b4e6d93@newsspool4.arcor-online.net>

Tim Arnold wrote:
> "?????? ???????????" <gdamjan at gmail.com> wrote in message 
> news:ciqh56-ses.ln1 at archaeopteryx.softver.org.mk...
>> So, I'm using lxml to screen scrap a site that uses the cyrillic
>> alphabet (windows-1251 encoding). The sites HTML doesn't have the <META
>> ..content-type.. charset=..> header, but does have a HTTP header that
>> specifies the charset... so they are standards compliant enough.
>>
>> Now when I run this code:
>>
>> from lxml import html
>> doc = html.parse('http://a1.com.mk/')
>> root = doc.getroot()
>> title = root.cssselect(('head title'))[0]
>> print title.text
>>
>> the title.text is ? unicode string, but it has been wrongly decoded as
>> latin1 -> unicode
> 
> The way I do that is to open the file with codecs, encoding=cp1251, read it 
> into variable and feed that to the parser.

Yes, if you know the encoding through an external source (especially when
parsing broken HTML), it's best to pass in either a decoded string or a
decoding file-like object, as in

	tree = lxml.html.parse( codecs.open(..., encoding='...') )

You can also create a parser with an encoding override:

	parser = etree.HTMLParser(encoding='...', **other_options)

Stefan


From dickinsm at gmail.com  Wed Feb  4 15:07:23 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 4 Feb 2009 12:07:23 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org> 
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
Message-ID: <8f6095b4-f316-4c64-a210-ab0d746659d7@s1g2000prg.googlegroups.com>

On Feb 4, 7:52?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> You are missing the whole thing that mes floating point tricky.
> I _believe_ that the epsilon is the smallest positive x such that
> ? ? 1.0 != 1.0 + x

Nitpick alert:  this isn't quite the same thing, since that
definition is affected by rounding.  For example, if you're
using IEEE 754 doubles but (somehow) you've got a round-half-up
rounding mode then this makes epsilon 2**-53 rather than 2**-52,
because 1 + 2**-53 rounds to 1 + 2**-52 != 1.

(This confused the hell out of me many years ago when I was
reading Numerical Recipes, and trying to figure out why
on earth IEEE 754 and the VAX format had different epsilons
even though both had 53-bit mantissas.  The answer is that
IEEE 754 uses round-half-even as standard, and VAX uses
round-half-up.  Oh, and the authors of Numerical Recipes
used the 1 != 1+x definition...)

Python's float_info.epsilon comes straight from C's
DBL_EPSILON, which is defined very carefully in the C99 standard
as:

"""the difference between 1 and the least value greater than 1
that is representable in the given floating point type"""

(taking the 'given floating point type' to be double).

Mark



From mdw at distorted.org.uk  Wed Feb  4 15:16:03 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:16:03 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <87d4dylzzw.fsf.mdw@metalzone.distorted.org.uk>

"Russ P." <Russ.Paielli at gmail.com> writes:

> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?

Huh?  The lock on the door isn't to keep the coworkers out.  It's to let
them /in/ while keeping everyone else out.  So I don't really see the
analogy.

Or are you talking about the individual offices?  If so, then I'd expect
the locks to be /used/ only under rather unusual circumstances.  If
someone in the office has something to hide, I think that's rather
suspicious, actually...

-- [mdw]


From pellegrinodj at gmail.com  Wed Feb  4 15:18:28 2009
From: pellegrinodj at gmail.com (pellegrinodj at gmail.com)
Date: Wed, 4 Feb 2009 12:18:28 -0800 (PST)
Subject: how to compile in jython 2.5b1??
Message-ID: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>

I have to use jython 2.5b1 couse with the stable version it's not
possible to use sympy library for mathematic operation but the
"jythonc.bat" it's not included.
I look to this link: http://www.jython.org/Project/jythonc.html
"..jythonc is unmaintained and will not be present in its current form
in Jython 2.5..."
so what can I do??
thank you for the answer!!


From steve at holdenweb.com  Wed Feb  4 15:20:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 15:20:29 -0500
Subject: sys.float_info.epsilon
In-Reply-To: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>
References: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>
Message-ID: <gmctai$2ho$1@ger.gmane.org>

Tim Rowe wrote:
> I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
> and I'm puzzled by some of his uses of sys.float_info.epsilon. I
> appreciate the issues of comparing floating point numbers, but I'm
> puzzled by code like:
>     ...
>     x = float(input(msg))
>     if abs(x) < sys.float_info.epsilon:
>         ...
> 
> What could the float() conversion return that would give different results for:
>     if abs(x) < sys.float_info.epsilon
> and (to my mind, more obvious):
>     if abs(x) == 0.0
> 
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly).  What am I missing here?
> 
epsilon is the difference between *1.0* and the next smallest number in
the representation.

It seems pretty obvious that the smallest representable number will be
way smaller than that. To me, at least. Think about the representation
of 1. + epsilon - the mantissa will have a leading 1, then all zeros but
for a trailing 1, and the exponent will effectively be 0.

For numbers close to zero the exponent will have a large negative
effective value (exponents are usually stored as biased positive
numbers), and so the smallest value will be tiny compared with epsilon.

Though it's a long time since I did my numerical analysis, and it isn't
clear to me exactly what the test *is* supposed to do.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From nytrokiss at gmail.com  Wed Feb  4 15:23:25 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 4 Feb 2009 22:23:25 +0200
Subject: [Web 2.0] Added-value of frameworks?
In-Reply-To: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <8a6b8e350902041223u68f4655bu728d49d25195672e@mail.gmail.com>

They provide a nice framework that will handle most of the annoying things.
With Django you don't need to write SQL (in a sense). etc..

On Wed, Feb 4, 2009 at 6:08 PM, Gilles Ganault <nospam at nospam.com> wrote:

> Hello
>
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?
>
> Thank you for your feedback.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From joviyach at gmail.com  Wed Feb  4 15:31:37 2009
From: joviyach at gmail.com (joviyach)
Date: Wed, 4 Feb 2009 12:31:37 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
Message-ID: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>

I am fairly new to Python, the first version I loaded was 2.6. I have
since downloaded 3.0 and I was wondering what the best practice for
upgrading is? I am using Windows XP Pro for my OS.

Thanks,

Jim


From Scott.Daniels at Acm.Org  Wed Feb  4 15:43:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 12:43:02 -0800
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
Message-ID: <S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>

joviyach wrote:
> I am fairly new to Python, the first version I loaded was 2.6. I have
> since downloaded 3.0 and I was wondering what the best practice for
> upgrading is? I am using Windows XP Pro for my OS.

On Windows, X.Y.* all go in one directory (over-riding each other)
So the whole 2.6.* family should work just fine alongside the 3.0.*
family.  In just a bit, 3.0.1 is coming soon, correcting some problems
in 3.0, so if you do install 3.0, check in a few weeks for an update.
The 2 -> 3 change was pretty substantial, so it will be a bit until the
3.0 line gets lots of outside packages.

--Scott David Daniels
Scott.Daniels at Acm.Org


From mdw at distorted.org.uk  Wed Feb  4 15:44:49 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:44:49 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<498825f3$0$3303$426a74cc@news.free.fr>
	<pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <878womlyny.fsf.mdw@metalzone.distorted.org.uk>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> Now, that's a toy example. Languages like Ada make correctness proofs, 
> well, perhaps not easy, but merely difficult compared to impossible for 
> languages like Python.

Say `generally impractical' rather than `impossible' and I'll agree with
you.  But I'm not actually sure that the situation for Python with
respect to correctness proofs is significantly harder than it is for C.
Certainly Ada (or at least dialects of Ada) have features which make
proof-supporting tools easier; I'm not aware of such proof support for
other languages.

Actually, if you're starting from a formal specification in Z, say, and
implementing in Python, well, the Z checker will already have ensured
that your specification is well typed; your proof that the
implementation follows the specification will automatically contain a
well-typed-ness proof of your implementation regardless of whether the
compiler provides static verification.

> To bring it back to private/public attributes, side-effects make 
> correctness proofs difficult. Modifications of attributes are side-
> effects. When attributes are subject to being modified by arbitrary code, 
> it is harder to reason about the correctness of the code:
>
> class Inverter(object):
>     def __init__(self, x):
>         # Pre-condition: x is always a float
>         if x:
>             self.x = x
>         else:
>             raise ValueError("x must not be zero")
>         # Post-condition: if self.x exists, it is a non-zero float
>     def invert(self):
>         return 1.0/self.x
>
>
> Is method invert correct?

I'd argue that it isn't, and in fact that the specification is wrong.
In particular, it ought to be a precondition that x is nonzero.  At this
point you can dump the explicit check at the cost of imposing a proof
obligation on the caller.

> No, it is not, because the invariant that self.x is non-zero may have 
> been broken by some arbitrary piece of code elsewhere. 

It's not stated as an invariant.  It's stated as a post-condition, which
is indeed true (almost[1]) regardless of the behaviour of other parts of
the program.

[1] A subclass may have already set self.x before invoking
    Inverter.__init__.  If you explicitly `del self.x' before raising
    the exception, the subclass can still defeat you by passing the
    reference to the half-constructed object to another thread which
    mutates the object at an inconvenient time.  I mention all of this
    merely to avoid pedantry in follow-ups.

I'd also argue that maintaining the invariant about self.x is the
responsibility of code that messes with self.x, and therefore it is
/legitimate/ to modify self.x from external code which maintains the
invariant.

> Our ability to reason about the correctness of the code is weakened
> significantly.  Sticking an underscore in front of x does not help:
> there's nothing to stop some arbitrary function elsewhere changing _x
> to zero.

Dichotomy for you.

  * EITHER the other code is written to the same high standards, in
    which case it will come with appropriate specifications,
    preconditions, postconditions, invariants and proofs for whatever it
    does, even -- especially -- if it involves grubbily messing about
    with your module's innards (so everything is fine);

  * OR the other code doesn't meet your high standards, in which case
    all bets are off anyway, from the point of view of formal-methods
    types at any rate (so you can wash your hands of the whole affair).

> (1) Paranoia. Make the developer responsible for checking everything all 
> the time:
[...]
> (2) Hope the error never occurs, and if it does, let the caller deal with 
> it.
[...]
> There is a third strategy, sadly not available to Python programmers: 
> prevention by catching potential errors at compile-time.

Four: Describe your interface clearly, specify the behaviour of
functions and so on; and leave whoever messes with your module with the
task of proving -- to whatever level of formality is required by their
project -- that what they've done is sane and reasonable.

In fact, since whatever one does in a project should be held to this
standard, whether it involves grubbing about inside undocumented
internals or not, there's nothing particularly special about this case.
Good job, really, since Python doesn't distinguish either. ;-)

-- [mdw]


From mdw at distorted.org.uk  Wed Feb  4 15:49:23 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:49:23 +0000
Subject: Where & how to deallocate resources in Python C extension
References: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>
Message-ID: <874ozalygc.fsf.mdw@metalzone.distorted.org.uk>

fredbasset1000 at gmail.com writes:

> I've written a C extension, see code below, to provide a Python
> interface to a hardware watchdog timer.  As part of the initialization
> it makes some calls to mmap, I am wondering should I be making
> balanced calls to munmap in some kind of de-init function?

The kernel should remove the mapping when your process exits anyway --
otherwise the world would be left in an inconsistent state if your
process got killed by SIGKILL for example.

> Do Python extensions have d'tors?

No.  But you can cheat: stash some object whose tp_del slot does your
cleanup in your extension's module under some funny name.  (And woe
betide anyone who dels the funny name prematurely!)  I'm not sure I'd
bother.

-- [mdw]


From deets at nospam.web.de  Wed Feb  4 15:56:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 04 Feb 2009 21:56:59 +0100
Subject: how to compile in jython 2.5b1??
In-Reply-To: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
Message-ID: <6uudorFh6dr4U1@mid.uni-berlin.de>

pellegrinodj at gmail.com schrieb:
> I have to use jython 2.5b1 couse with the stable version it's not
> possible to use sympy library for mathematic operation but the
> "jythonc.bat" it's not included.
> I look to this link: http://www.jython.org/Project/jythonc.html
> "..jythonc is unmaintained and will not be present in its current form
> in Jython 2.5..."
> so what can I do??
> thank you for the answer!!


What do you need jythonc for? That's purely for a somewhat neater 
integration of *Java* with jython - nothing to do with sympy.

Diez


From kst-u at mib.org  Wed Feb  4 16:06:30 2009
From: kst-u at mib.org (Keith Thompson)
Date: Wed, 4 Feb 2009 21:06:30 +0000 (UTC)
Subject: structs
References: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<lnocxj7y2t.fsf@nuthaus.mib.org>
Message-ID: <ln6jx91syq.fsf@nuthaus.mib.org>

"Scott David Daniels" <Scott.Daniels at Acm.Org> writes:
> To avoid using epsilon, do something like: 
>     if 1 + abs(x) != 1:


An OK effort, but you're wrong.  That's not how to do it at all.


From pellegrinodj at gmail.com  Wed Feb  4 16:08:05 2009
From: pellegrinodj at gmail.com (ruelle)
Date: Wed, 4 Feb 2009 13:08:05 -0800 (PST)
Subject: how to compile in jython 2.5b1??
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
	<6uudorFh6dr4U1@mid.uni-berlin.de>
Message-ID: <1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>

> What do you need jythonc for? That's purely for a somewhat neater
> integration of *Java* with jython - nothing to do with sympy.
>
> Diez

I need jythonc to compile a simple script in java,
this script import SymPy library.

thank you
ruelle


From mal at egenix.com  Wed Feb  4 16:16:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:16:31 +0100
Subject: JDBC in CPYTHON
In-Reply-To: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
Message-ID: <498A05AF.2070706@egenix.com>

On 2009-02-03 19:30, KMCB wrote:
> I was wondering if anyone was aware of a JDBC DBAPI module for
> cpython.  I have looked at PYJDBC and was interested in avoiding using
> that extra level of ICE.  I was thinking maybe someone would have back
> ported zxJDBC from Jython.  Or used that as a starting point, to
> create a module and had a C based wrapper for the driver.  This type
> of activity was talked about back in 2004 on this forum, but I was
> wondering if anyone had newer information.

Why not use ODBC instead ?

   http://www.egenix.com/products/python/mxODBC/

(zxJDBC is based on and was inspired by mxODBC)

Or, if you don't have ODBC drivers for your database, use an
ODBC-JDBC bridge such as:

    http://www.easysoft.com/products/data_access/odbc_jdbc_gateway/
or
    http://odbcjdbc.sourceforge.net/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From kst-u at mib.org  Wed Feb  4 16:20:43 2009
From: kst-u at mib.org (Keith Thompson)
Date: Wed, 4 Feb 2009 21:20:43 +0000 (UTC)
Subject: structs
References: <mailman.8268.1233224504.3487.python-list@python.org>
	<lnwsc66tg7.fsf@nuthaus.mib.org>
Message-ID: <ln6jx71iyq.fsf@nuthaus.mib.org>

"Gary Herron" <gherron at islandtraining.com> writes:
> Python *is* object-oriented

I disagree. Care to provide proof of that statement?


From mal at egenix.com  Wed Feb  4 16:26:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:26:37 +0100
Subject: x64 speed
In-Reply-To: <49896AA0.2050202@chamonix.reportlab.co.uk>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>	<4988BAE8.2060204@v.loewis.de>
	<49896AA0.2050202@chamonix.reportlab.co.uk>
Message-ID: <498A080D.3000703@egenix.com>

On 2009-02-04 11:14, Robin Becker wrote:
> Martin v. L?wis wrote:
>>>> I follow David's guess that Linux does better IO than Windows (not
>>>> knowing anything about the benchmark, of course)
>>>>
>>> I originally thought it must be the vmware host stuff offloading IO to
>>> the second core, but watching with sysinternals didn't show a lot of
>>> extra stuff going on with the vm compared to just running on the host.
>>
>> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
>> Linux buffer handling, is just more efficient than NTFS, and the Windows
>> buffer handling.
>>
>> If you split the total runtime into system time and user time, how do
>> the 30s split up?
> .......
> so here is one for the vm clock is bad theorists :)
> 
> 
>> [rptlab at localhost tests]$ time python25 runAll.py
>> .............................................................
> 
> .........................
>> ----------------------------------------------------------------------
>> Ran 193 tests in 27.841s
>>
>> OK
>>
>> real    0m28.150s
>> user    0m26.606s
>> sys     0m0.917s
>> [rptlab at localhost tests]$
> 
> magical how the total python time is less than the real time.

time(1) also measures the Python startup and shutdown time, so
I don't quite see the magic :-(

FWIW: VMware VMs need the VMware tools installed to make their
clocks work more or less. With Linux, you need some extra tweaks
as well, otherwise the clocks are just completely unreliable.

See these notes:

http://kb.vmware.com/selfservice/viewContent.do?language=en_US&externalId=1420
http://communities.vmware.com/message/782173

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From bignose+hates-spam at benfinney.id.au  Wed Feb  4 16:28:43 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Thu, 05 Feb 2009 08:28:43 +1100
Subject: Kill a function while it's being executed
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
	<749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
	<mailman.8777.1233762857.3487.python-list@python.org>
Message-ID: <878wolzyb8.fsf@benfinney.id.au>

"Noam Aigerman" <noama at answers.com> writes:

> About the hijacking - I *might* have done it without understanding
> what I did (replied to a previous message and then changed the
> subject), if that's what you mean...

Right. The message still declares itself (via fields in the header) to
be a reply to the original, regardless of the subject change. If your
reply actually has no bearing on the original, then that's what is
known as hijacking a thread.

To start a new thread, you need to compose a new message to the forum.

-- 
 \       ?[Freedom of speech] isn't something somebody else gives you. |
  `\      That's something you give to yourself.? ?_Hocus Pocus_, Kurt |
_o__)                                                         Vonnegut |
Ben Finney


From mal at egenix.com  Wed Feb  4 16:43:04 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:43:04 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <4988557A.5020407@wildenhain.de>
References: <874ozbhdoi.fsf@christopherculver.com>	<mailman.8689.1233667986.3487.python-list@python.org>	<87y6wnfxoe.fsf@christopherculver.com>
	<4988557A.5020407@wildenhain.de>
Message-ID: <498A0BE8.5080205@egenix.com>

On 2009-02-03 15:32, Tino Wildenhain wrote:
> Christopher Culver wrote:
>> Tino Wildenhain <tino at wildenhain.de> writes:
>>> so instead you would use archive = zipfile.ZipFile(remotedata)
>>
>> That produces the following error if I try that in the Python
>> interpreter (URL edited for privacy):
>>
>>>>> import zipfile
>>>>> import urllib2
>>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>>> archive = zipfile.ZipFile(remotedata)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
>>     self._GetContents()
>>   File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
>>     self._RealGetContents()
>>   File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
>>     endrec = _EndRecData(fp)
>>   File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
>>     fpin.seek(-22, 2)               # Assume no archive comment.
>> AttributeError: addinfourl instance has no attribute 'seek'

Try this:

>>> import urllib, zipfile, cStringIO
>>> zipwebfile = urllib.urlopen('http://downloads.egenix.com/python/locale-0.1.zip')
>>> buffer = cStringIO.StringIO(zipwebfile.read())
>>> zfile = zipfile.ZipFile(buffer)
>>> zfile.printdir()
File Name                                             Modified             Size
locale/Makefile.pre.in                         1997-10-31 21:13:06         9818
locale/Setup.in                                1997-10-31 21:14:04           74
locale/locale.c                                1997-11-19 17:36:46         4698
locale/CommandLine.py                          1997-11-19 15:50:02         2306
locale/probe.py                                1997-11-19 15:51:18         1870
locale/__init__.py                             1997-11-19 17:55:02            0

The trick is to use a StringIO buffer to provide the .seek()
method.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From digitig at gmail.com  Wed Feb  4 16:44:49 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 21:44:49 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902041344h70a1fa27lde3e0951c711fa44@mail.gmail.com>

2009/2/4 Mark Dickinson <dickinsm at gmail.com>:

> There are many positive floating-point values smaller than
> sys.float_info.epsilon.
>
> sys.float_info.epsilon is defined as the difference between 1.0 and
> the next largest representable floating-point number.  On your system,
> the next largest float is almost certainly 1 + 2**-52, so
> sys.float_info.epsilon will be exactly 2**-52, which is around
> 2.2e-16.  This number is a good guide to the relative error
> from rounding that you can expect from a basic floating-point
> operation.
>
> The smallest positive floating-point number is *much* smaller:
> again, unless you have a very unusual platform, it's going to
> be 2**-1074, or around 4.9e-324.  In between 2**-1074 and
> 2**-52 there are approximately 4.4 million million million
> different floating-point numbers.  Take your pick!

Ok, that makes a lot of sense, thanks. I was thinking in terms of
Ada's floating point delta (rather than epsilon), which as I remember
it, if specified, applies uniformly across the whole floating point
range, not just to a particular point on the scale.

That just leaves me puzzled as to why Mark Summerfield used it instead
of a check against zero on user input. There's a later division by
2*x, so small values of x matter; there's no protection against
overflow (the numerator could perfectly well be somewhere up near
sys.float_info.max; a quick check in the shell tells me that Python3
will happily do sys.float_info.max/(2*sys.float_info.epsilon) and will
give me the answer "inf") so presumably he's trying to protect against
divide by zero. So my next question is whether there is any x that can
be returned by float() such that x != 0 but some_number / (2 * x)
raises a ZeroDivisionError?


-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 16:47:24 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 21:47:24 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
Message-ID: <aee48b3c0902041347w79e610ey364ef3f6e5319b44@mail.gmail.com>

2009/2/4 Scott David Daniels <Scott.Daniels at acm.org>:

Thanks for that. It makes me feel guilty to point out that:

> addition is not associative in real numbers

should presumably be "addition is not associative in floating point numbers".

-- 
Tim Rowe


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb  4 16:49:53 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 22:49:53 +0100
Subject: Couple of noobish question
In-Reply-To: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <498a1b1d$0$24204$426a74cc@news.free.fr>

Catherine Heathcote a ?crit :
> Firstly hi, I don't know any of you yet but am picking up Python and 
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 
> years of a comp tech degree, long story) and am learning Python, 'cos I 
> saw some code and it just looks a really nice language to work with. I 
> come from C++, so I am bound to trip up trying to do things the wrong way!
> 
> I have been working with Project Euler to get the hang of Python, and 
> all goes well. I have an idea for a small project, an overly simplistic 
> interactive fiction engine (well more like those old choose your own 
> adventure books, used to love those!) that uses XML for its map files.

You may have good reasons to choose this format, but FWIW, some (most ?) 
of us here tend to prefer "lighter" formats like json or yaml, or even 
just plain Python source. But, well, just so you know there are possible 
alternatives to XML !-)

> The main issues I see so far is the XML parsing (I should pick that up 
> ok, I have a blackbelt in google-foo), but more importantly splitting 
> code files.

???

Oh, you mean, how to organize your source code ?

> In C++ I would obviously split .cpp and .h files, pairing them up and 
> using #include. How do I do this in Python? I see that you don't tend to 
> split logic from defenition,

Ok.

First thing you must know: in Python, almost everything happens at 
runtime (the only error you might get at compile time is SyntaxError), 
and "import", "class" and "def" are actually executable statements. That 
is, when a module (or main program FWIW) is first loaded (directly for 
the main program, via an import statement for other modules), all the 
top-level code of the corresponding source file is executed 
sequentially. One of the implications is that there's no need for 
preprocessor directives - you just use Python code (at the module 
top-level) to have alternative versions of a function or conditional 
imports (which BTW are _not_ the same as #include directives ). Like:


# somemodule.py

import os

if os.uname()[0] == "Linux":
    def somefunc():
        return "this is the Linux version"
else
    def somefunc():
        return "this is not the Linux version"

try:
   import some_module
   something = some_module.something
else:
    # some_module not installed
   something = "default"

# etc...


To make a long story short: your notions of "definition" and "logic" 
don't really apply here.

>  but how do I keep different classes in 
> different files? 

You don't necessarily have to keep you class in "different files" - it 
really depends on the project's complexity. If you only have a couple 
classes, functions and (pseudo)constants, you just stick them either in 
the main program file (if it's a simple script) or in a module. If it 
gets a bit more complex, regroup classes and functions in distinct 
modules or packages trying to make each module (or package) as cohesive 
and decoupled as possible. Just have at look at the modules and packages 
in the stdlib to see what it may looks like.

> My google-fu fails me so far.

You were probably lokking for this:
http://docs.python.org/tutorial/modules.html

My two cents...


From deets at nospam.web.de  Wed Feb  4 16:55:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 04 Feb 2009 22:55:48 +0100
Subject: how to compile in jython 2.5b1??
In-Reply-To: <1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
	<6uudorFh6dr4U1@mid.uni-berlin.de>
	<1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>
Message-ID: <6uuh74Fh26j9U1@mid.uni-berlin.de>

ruelle schrieb:
>> What do you need jythonc for? That's purely for a somewhat neater
>> integration of *Java* with jython - nothing to do with sympy.
>>
>> Diez
> 
> I need jythonc to compile a simple script in java,
> this script import SymPy library.

You need to find other ways.

The usual approach to this is a factory-pattern with an embedded 
Jython-interpreter. There is the Jython-magazine that a couple of years 
ago brought a few examples of these techniques. They roughly work as this:


  - create a jython-file contains a jython-class 
subclassing/implementing some Java class or interface.

  - write a java-class that instantiates a jython interpreter

  - make that intepreter execute a small script (one-liner) to create 
one  instance of that jython-class, and assigns it to a global variable.

  - fetch that variable's value from the interpreter-instance, and pass 
it to some java-code that works with it.

This is working for nearly *all* use-cases, the exception only being 
rare casese where some Java-framework itself uses something like 
classForName to instantiate a class (e.g. struts for action-classes)

But even then, you could simply create a java delegation class with the 
same recipe.

There really is no need for the Jythonc, which is the reason it is 
discontinued I presume.

Diez


From aahz at pythoncraft.com  Wed Feb  4 17:01:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 Feb 2009 14:01:02 -0800
Subject: Understanding descriptors
References: <mailman.8322.1233272628.3487.python-list@python.org>
Message-ID: <gmd36u$eq2$1@panix3.panix.com>

In article <mailman.8322.1233272628.3487.python-list at python.org>,
Brian Allen Vanderburg II  <BrianVanderburg2 at aim.com> wrote:
>
>  [...]
>
>When a lookup is done it uses this descriptor to make a bound or unbound 
>method:
>
>c=C()
>
>C.F # unbound method object, expects explicit instance when calling the 
>function
>c.F # bound method object provides instance implicitly when calling the 
>function
>
>This is also done when adding to the classes:
>
>C.f1 = f1
>
>f1 # function
>C.f1 # unbound method
>c.f1 # bound method
>
>To prevent this it has to be decorated so the descriptor doesn't cause 
>the binding:
>
>C.f2 = staticmethod(f1)
>C.f2 # functon
>c.f2 # function
>
>Here is a question, why don't instance attributes do the same thing?
>
>c.f3 = f1
>c.f3 # function, not bound method
>
>So it is not calling the __get__ method for c.f3  After it finds c.f3 in 
>c.__dict__, and since it has a getter, shouldn't it call the __get__ to 
>return the bound method.  It is good that it doesn't I know, but I just 
>want to know why it doesn't from an implementation view.

This is a bit beyond my expertise, but nobody else has responded, so I'll
take a stab at it:

Basically, this is part of the design philosphy that keeps everything
working the same way.  When an attribute is found on an instance, it
gets returned unmodified.  Period.  In other words, the fact that f3
happens to return a function object gets ignored.  You can force f3 to
work like a bound method by defining it as one:

def f3(self):
    pass

If you use a new-style class or Python 3.0, the same design is evident
when you try to use e.g. str() to call the __str__() special method: the
instance gets ignored for looking up the method.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb  4 17:01:14 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 23:01:14 +0100
Subject: [Web 2.0] Added-value of frameworks?
In-Reply-To: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <498a1dc7$0$10675$426a74cc@news.free.fr>

Gilles Ganault a ?crit :
> Hello
> 
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?

Quite a lot of abstractions and factorisation of the boilerplate code, a 
known way to organize your application, and possibly a good integration 
of the usual components (and wrt/ Django, a customizable yet fairly 
usable OOTB admin interface). For simple to mediumly complex 
applications, this can mean more than 80% of the grunt work. The 
counterpart is mostly learning and understanding the framework, which 
means you may not save that much time on a first project - but it can 
really pay off then. One of my coworker started this morning a (really 
simple...) project which acceptance tests are to begin on monday, and we 
are all quite confident he'll deliver on time, thanks to Django.



From kyrie at uh.cu  Wed Feb  4 17:13:31 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 4 Feb 2009 17:13:31 -0500
Subject: is python Object oriented??
In-Reply-To: <fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8774.1233754556.3487.python-list@python.org>
	<fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>
Message-ID: <200902041713.32118.kyrie@uh.cu>

On Wednesday 04 February 2009 10:53:54 am Russ P. wrote:
> On Feb 4, 5:35?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> > Quoting "Russ P." <Russ.Paie... at gmail.com>:
> > This analogy is nonsense. There is no way you will execute code on my
> > system if I don't authorize it, regardless of how "public" are the
> > variables declared in my code. No one will execute code on _your_ system
> > either, without your authorization. That puts you in a different
> > position: you can easily _check_ that everything is alright before
> > executing, whereas in the office example, it cannot be done.
>
> I don't follow your point, 
[...]
> The locks on the doors are analogous to enforced access restrictions.

And that is my point, nothing more, nothing less. They aren't analogous.

I know a bit of python, and a bit of programming, and I think you do too. If 
you can't make your point without an analogy, isn't it perhaps that your 
point is not transferable from the analogy to the python context where you 
are trying to apply it?.

You can control everything that happens in your systems, whatever those 
systems may be. There are no locks, no offices, no employees going unchecked. 
You can decide, at any time you want, if the code you are about to run meets 
your policies. The particular one you are talking about, the "data hiding", 
can be easily checked. By you, by the QA team, by a computer, by an automated 
system, by your own pseudo python interpreter that will run pylint against 
the code before trying to run it. 

Insert that into your office analogy, and maybe then situations will be a 
little more analogous. But keep in mind that the only difference between what 
you claim to want and what you currently have, is that _you_ (not me) can 
decide whether to use it or not.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From joviyach at gmail.com  Wed Feb  4 17:38:06 2009
From: joviyach at gmail.com (joviyach)
Date: Wed, 4 Feb 2009 14:38:06 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
Message-ID: <4bb62c09-d590-4065-90eb-f112aedd97df@d36g2000prf.googlegroups.com>

On Feb 4, 2:43?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> joviyach wrote:
> > I am fairly new to Python, the first version I loaded was 2.6. I have
> > since downloaded 3.0 and I was wondering what the best practice for
> > upgrading is? I am using Windows XP Pro for my OS.
>
> On Windows, X.Y.* all go in one directory (over-riding each other)
> So the whole 2.6.* family should work just fine alongside the 3.0.*
> family. ?In just a bit, 3.0.1 is coming soon, correcting some problems
> in 3.0, so if you do install 3.0, check in a few weeks for an update.
> The 2 -> 3 change was pretty substantial, so it will be a bit until the
> 3.0 line gets lots of outside packages.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks Scott, I will be lurking/hopefully contributing.


From steve at holdenweb.com  Wed Feb  4 17:38:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 17:38:23 -0500
Subject: structs
In-Reply-To: <ln6jx71iyq.fsf@nuthaus.mib.org>
References: <mailman.8268.1233224504.3487.python-list@python.org>	<lnwsc66tg7.fsf@nuthaus.mib.org>
	<ln6jx71iyq.fsf@nuthaus.mib.org>
Message-ID: <gmd5d0$v80$1@ger.gmane.org>

Keith Thompson wrote:
> "Gary Herron" <gherron at islandtraining.com> writes:
>> Python *is* object-oriented
> 
> I disagree. Care to provide proof of that statement?

Disagree all you like. Just do it silently, please.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Wed Feb  4 17:49:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 14:49:51 -0800 (PST)
Subject: Structuring Modules with a Ubiquitous Base Class (Circular 
	Dependencies)
Message-ID: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>

Is there a good solution to the following problem?

I have a library whose components I would like to separate into
distinct modules.  These components inherit from a common base class
that provides common functionality (the inheritance is important only
for implementation; there's a separate ABC mechanism for typing).

Now as that stands, there is no problem.  Each module could import the
common base class.

Unfortunately the base class itself references many of the components
(the reason for this is that supplies operator implementations (like
__add__) which are shortcuts for the components themselves).

This leads to a circular dependency - the base class wants to import
the components, which in turn want to import the base class.

Is there any standard solution to this?

Thanks,
Andrew


From lionel.keene at gmail.com  Wed Feb  4 17:51:17 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 14:51:17 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
Message-ID: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>

Hello everyone. Quick question: When using the "read()" method in the
array module, must I redirect the current file pointer or will that
occur automatically?

For example, if I were to sequentially read data in chunks from a
binary file as in:


for currentChunk in range(numberOfChunksToRead):

       floatData = array.array('f')
       floatData.read(MyFileHandle, numberOfFloatsPerChunk)
       ...go to work on data...


at each iteration of the "for" loop, will the next chunk of bytes be
read into "floatData" or must I move the file pointer by calling "seek
()" or some function like that?

Thanks everyone.
L


From Scott.Daniels at Acm.Org  Wed Feb  4 17:53:07 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 14:53:07 -0800
Subject: More on ancient pythons (before version 0.0?)
Message-ID: <86udncDdhtd8hhfUnZ2dnUVZ_rHinZ2d@pdx.net>

Apparently there is some fossil evidence of an early version of Python
over 50 million years ago.  Must have been some large negative
version.  It apparently suffered from serious code bloat, since
the article says it was 13 meters long and over a megagram.
     http://news.bbc.co.uk/1/hi/sci/tech/7868588.stm
I know, Titanoboa might not have actually been a python, but it
may well have been a precursor to our Python.

--Scott David Daniels
Scott.Daniels at Acm.Org


From lsumnler at gmail.com  Wed Feb  4 18:06:00 2009
From: lsumnler at gmail.com (len)
Date: Wed, 4 Feb 2009 15:06:00 -0800 (PST)
Subject: How to find wxPython method documentation??
Message-ID: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>

Hi

I am going through the "wxPython in Action" book by Noel Rappin and
Robin Dunn.

I have been typing in the example programs as I go and play with
modifing the code.
Thought I should start trying to find my way around the documentation
found on the wxPython web site.

The problem I have been having is I can't find the methods or more
specifically

'SetBackgroundColour' or 'AddSimpleTool' for example.

How does one find the methods that are available in the classes.

I tried looking at the wxWidgets web site and still had the same
problem.

Could someone give me a little direction in this?

Thanks
Len


From google at mrabarnett.plus.com  Wed Feb  4 18:10:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 23:10:39 +0000
Subject: Does array.read() move file pointer automatically?
In-Reply-To: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
Message-ID: <498A206F.7090501@mrabarnett.plus.com>

Lionel wrote:
 > Hello everyone. Quick question: When using the "read()" method in the
 > array module, must I redirect the current file pointer or will that
 > occur automatically?
 >
 > For example, if I were to sequentially read data in chunks from a
 > binary file as in:
 >
 >
 > for currentChunk in range(numberOfChunksToRead):
 >
 >        floatData = array.array('f')
 >        floatData.read(MyFileHandle, numberOfFloatsPerChunk)
 >        ...go to work on data...
 >
 >
 > at each iteration of the "for" loop, will the next chunk of bytes be
 > read into "floatData" or must I move the file pointer by calling "seek
 > ()" or some function like that?
 >
The read() method has been deprecated since version Python 1.5.1. Use
the fromfile() method instead.

It will advance the file pointer.


From andrew at acooke.org  Wed Feb  4 18:12:58 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 15:12:58 -0800 (PST)
Subject: Structuring Modules with a Ubiquitous Base Class (Circular 
	Dependencies)
References: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>
Message-ID: <b61d3f95-f02f-4a54-8d8a-b62b9285082f@r24g2000vbp.googlegroups.com>

On Feb 4, 7:49?pm, andrew cooke <and... at acooke.org> wrote:
> This leads to a circular dependency - the base class wants to import
> the components, which in turn want to import the base class.
>
> Is there any standard solution to this?

well, to partially answer my own question, this is certainly
possible.  in the general case it might get quite complex, but for the
structure described it is quite simple.  the 'trick' is to import the
component in the *method* of the common base class.

for example:

class Base(object):

    def __init__(self):
        from first import First
        from second import Second
        self.first = lambda *args: First(*args)
        self.second = lambda *args: Second(*args)

where First, defined in first, subclasses Base in the normal way.

however, i suspect this will have a performance hit, since "linking"
is being done at "run time" rather than "compile time".  anyone have
any guidance on how serious that would be?  i guess it could be
ameliorated by doing the work in the constructor (as above, which is
just that way for a compact example - in "real life" the components
are used in a more complex manner).

and i still suspect there is a more efficient metaclass or similar
approach.

andrew


From lionel.keene at gmail.com  Wed Feb  4 18:37:11 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 15:37:11 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
	<mailman.8809.1233789036.3487.python-list@python.org>
Message-ID: <b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>

On Feb 4, 3:10?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> Hello everyone. Quick question: When using the "read()" method in the
> ?> array module, must I redirect the current file pointer or will that
> ?> occur automatically?
> ?>
> ?> For example, if I were to sequentially read data in chunks from a
> ?> binary file as in:
> ?>
> ?>
> ?> for currentChunk in range(numberOfChunksToRead):
> ?>
> ?> ? ? ? ?floatData = array.array('f')
> ?> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ?> ? ? ? ?...go to work on data...
> ?>
> ?>
> ?> at each iteration of the "for" loop, will the next chunk of bytes be
> ?> read into "floatData" or must I move the file pointer by calling "seek
> ?> ()" or some function like that?
> ?>
> The read() method has been deprecated since version Python 1.5.1. Use
> the fromfile() method instead.
>
> It will advance the file pointer.

Thank you, I'll change it. On a related matter, I seem to be making a
mistake somewhere in the way I'm importing and using modules (in
particular the "array" module).

The following code generates an error (traceback message follows
code):

import pdb
import array
from numpy import *

class MyClass:

    def __init__(self, initialData):

        test = array.array('f')  # Trigger error message



The traceback message is:

test = array.array('f')
AttributeError: 'builtin_function_or_method' object has no attribute
'array'

According to the Python 2.5 documentation for the "array" module it
does have an "array" method. I'm closely following examples I've found
online (here, for ex: http://www.python.org/search/hypermail/python-1993/0393.html)
but don't see my error.

This error goes away if I change the import statement to:

import pdb
from array import *
from numpy import *

and the instruction to

test = array('f')

but then I get another error (sorry I don't have it handy) that
implies Python is interpreting the object returned from "array('f')"
as a numpy.ndarray object. Something I'm doing is causing ambiguity it
seems.

Anyone? As always, thank you for the help.

L


From andrew at acooke.org  Wed Feb  4 18:49:00 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 15:49:00 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <5ef6e64b-1468-4ee2-8261-3ba027ca5370@p2g2000prf.googlegroups.com>

On Feb 4, 8:06?pm, len <lsumn... at gmail.com> wrote:
> How does one find the methods that are available in the classes.

heh.  welcome to the wonderful world of wxpython :o(

if you use eclipse to edit your code, then (providing the wind is in
the right direction and the file you are editing doesn't have any
syntax errors) pressing F3 when you are on a particular method will
take you to the definition.  or, at least, one of the definitions with
that name.

and if you want to see a list of available methods the simplest way is
to use tab completion (or dir() in python itself).

if you're not using eclipse (with pydev) check to see if the ide/
editor you are using has something similar.

also, wxpython comes with some examples, all packaged in a demo
program.  that is your best source of documentation.  go through all
the examples in there and look at the code (the demo program will show
you the code and even let you edit it and see the results of your
changes).

to be honest, wxpython is a bit of a nightmare (imho). but the results
can be worth it.

good luck,
andrew


From rhodri at wildebst.demon.co.uk  Wed Feb  4 19:09:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 00:09:08 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <op.uouqpiaya8ncjz@gnudebst>

On Wed, 04 Feb 2009 17:23:55 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> I guess what I am saying is that it does not seem like I am adding any
> information that is not already there when I have to enter that list and
> list name after all they are the same.
> Thanks

But you are.  Consider just for a moment what happens when you execute
savedata([1, 2, 3, 55]).

Fundamentally, the concept of a single unique name for any object isn't
something built into the language (or, indeed, most languages I can think
of).  An object can have no names (though it'll promptly get garbage
collected if it isn't assigned to a name somehow), or just as easily
one or many names.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From digitig at gmail.com  Wed Feb  4 19:14:22 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:14:22 +0000
Subject: Couple of noobish question
In-Reply-To: <498a1b1d$0$24204$426a74cc@news.free.fr>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
Message-ID: <aee48b3c0902041614w535473c3wd2b7c1ec2cb3e7eb@mail.gmail.com>

2009/2/4 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr>:

> # somemodule.py
>
> import os
>
> if os.uname()[0] == "Linux":

On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
doesn't seem to contain uname. Is that a Linux thing? Would os.name
work on Linux? Or would one have to use exception handling and catch
the Windows case?

That's the trouble with using anything in os, of course -- it's os
dependent, which is why it's there! :-)

-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 19:18:03 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:18:03 +0000
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
Message-ID: <aee48b3c0902041618s6d49cb85n3435b97c754a1bfa@mail.gmail.com>

2009/2/4 Scott David Daniels <Scott.Daniels at acm.org>:
> joviyach wrote:
>>
>> I am fairly new to Python, the first version I loaded was 2.6. I have
>> since downloaded 3.0 and I was wondering what the best practice for
>> upgrading is? I am using Windows XP Pro for my OS.
>
> On Windows, X.Y.* all go in one directory (over-riding each other)
> So the whole 2.6.* family should work just fine alongside the 3.0.*

Just don't try to have a 2.6 version of Idle and a 3.0 version of Idle
running at the same time! 2.6 WinPy and 3.0 Idle seem to coexist ok,
which is handy when I'm trying to get to grips with the differences
between versions..

-- 
Tim Rowe


From Scott.Daniels at Acm.Org  Wed Feb  4 19:29:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 16:29:37 -0800
Subject: sys.float_info.epsilon
In-Reply-To: <mailman.8806.1233784046.3487.python-list@python.org>
References: <mailman.8799.1233775108.3487.python-list@python.org>	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<mailman.8806.1233784046.3487.python-list@python.org>
Message-ID: <B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>

I wrote:
 > You are missing the whole thing that mes floating point tricky....
 > The reason it is tough is that addition is not associative in real
 > numbers, and associativity is at the core > of a lot of proofs in
 > arithmetic (and group theory).

In response to which Tim Rowe wrote:
> ... Thanks for that. It makes me feel guilty to point out that:
> >   addition is not associative in real numbers
> should presumably be "addition is not associative in floating point numbers".

And, of course he is right (and didn't even whomp on my typo of "makes"
as "mes in the first line quoted above).

--Scott David Daniels
Scott.Daniels at Acm.Org


From afriere at yahoo.co.uk  Wed Feb  4 19:31:24 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Wed, 4 Feb 2009 16:31:24 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com> 
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
Message-ID: <e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>

On Feb 5, 11:14?am, Tim Rowe <digi... at gmail.com> wrote:

...

> On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
> doesn't seem to contain uname. Is that a Linux thing? Would os.name
> work on Linux? Or would one have to use exception handling and catch
> the Windows case?

It seems to be a Windows thing.  My Linux box gives me 'Linux' the
server gives me 'SunOS' and a Mac tells me 'Darwin'.  I'm still
running Python2.4 on the Windows box.  At least in that version on the
OS,  the 'os' module has no attribute 'uname',  On both Linux and
SunOS, os.name returns 'posix'.



From mdw at distorted.org.uk  Wed Feb  4 19:35:45 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Thu, 05 Feb 2009 00:35:45 +0000
Subject: structs
References: <mailman.8268.1233224504.3487.python-list@python.org>
	<lnwsc66tg7.fsf@nuthaus.mib.org> <ln6jx71iyq.fsf@nuthaus.mib.org>
Message-ID: <87zlh1lnz2.fsf.mdw@metalzone.distorted.org.uk>

Keith Thompson <kst-u at mib.org> writes:

> "Gary Herron" <gherron at islandtraining.com> writes:
>> Python *is* object-oriented
>
> I disagree. Care to provide proof of that statement?

AWOOGA!

The article I'm following up to (together with at least one other) is a
forgery, and the Followup-To header is set to comp.lang.c as part of an
effort to (a) disrupt that newsgroup, and (b) discredit Keith Thompson,
who is a respected and capable contributor to that group.

This is a request to other readers to take special care over responding
to controversial articles, and particularly to watch for strange
Followup-To headers.

Thanks for listening.

-- [mdw]


From digitig at gmail.com  Wed Feb  4 19:36:52 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:36:52 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<mailman.8806.1233784046.3487.python-list@python.org>
	<B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>
Message-ID: <aee48b3c0902041636x6b946364s9dd859a6de758e07@mail.gmail.com>

2009/2/5 Scott David Daniels <Scott.Daniels at acm.org>:

> And, of course he is right (and didn't even whomp on my typo of "makes"
> as "mes in the first line quoted above).

A typo for "makes" didn't bother me. Non-associativity of the real
numbers under addition risked making my whole world fall apart :-)


-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 19:45:56 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:45:56 +0000
Subject: Couple of noobish question
In-Reply-To: <e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
	<e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>
Message-ID: <aee48b3c0902041645p11030c98oa00833d951e9fb72@mail.gmail.com>

2009/2/5  <afriere at yahoo.co.uk>:
> On Feb 5, 11:14 am, Tim Rowe <digi... at gmail.com> wrote:
>
> ...
>
>> On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
>> doesn't seem to contain uname. Is that a Linux thing? Would os.name
>> work on Linux? Or would one have to use exception handling and catch
>> the Windows case?
>
> It seems to be a Windows thing.  My Linux box gives me 'Linux' the
> server gives me 'SunOS' and a Mac tells me 'Darwin'.  I'm still
> running Python2.4 on the Windows box.  At least in that version on the
> OS,  the 'os' module has no attribute 'uname',  On both Linux and
> SunOS, os.name returns 'posix'.

Python in a Nutshell states that os.uname "exists only on certain
platforms", and in the code sample wraps it in a try statement. That
seems to be the safe way to go -- except (and I don't know much about
this) wouldn't code have to be digging into some pretty obscure
corners to find a difference between different posix implementations?


-- 
Tim Rowe


From todpose at hotmail.com  Wed Feb  4 20:02:48 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:02:48 -0800
Subject: Using while loop and if statement to tell if a binary has an odd or
	even number of 1's.
Message-ID: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>


Using while loop and if statement, I'm trying to get Python to tell me whether there are even or odd number of 1's in a binary representation.
For example, if I give Python a 00000111, then I want it to say that the binary representation given has an odd number of 1's.
If I give it 00010111, then it will tell me that there is an even number of 1's.
I'd appreciate any suggestion.
Thanks!
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From google at mrabarnett.plus.com  Wed Feb  4 20:10:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 01:10:49 +0000
Subject: Does array.read() move file pointer automatically?
In-Reply-To: <b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>	<mailman.8809.1233789036.3487.python-list@python.org>
	<b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
Message-ID: <498A3C99.5090208@mrabarnett.plus.com>

Lionel wrote:
 > On Feb 4, 3:10 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
 >> Lionel wrote:
 >>
 >>  > Hello everyone. Quick question: When using the "read()" method in the
 >>  > array module, must I redirect the current file pointer or will that
 >>  > occur automatically?
 >>  >
 >>  > For example, if I were to sequentially read data in chunks from a
 >>  > binary file as in:
 >>  >
 >>  >
 >>  > for currentChunk in range(numberOfChunksToRead):
 >>  >
 >>  >        floatData = array.array('f')
 >>  >        floatData.read(MyFileHandle, numberOfFloatsPerChunk)
 >>  >        ...go to work on data...
 >>  >
 >>  >
 >>  > at each iteration of the "for" loop, will the next chunk of bytes be
 >>  > read into "floatData" or must I move the file pointer by calling 
"seek
 >>  > ()" or some function like that?
 >>  >
 >> The read() method has been deprecated since version Python 1.5.1. Use
 >> the fromfile() method instead.
 >>
 >> It will advance the file pointer.
 >
 > Thank you, I'll change it. On a related matter, I seem to be making a
 > mistake somewhere in the way I'm importing and using modules (in
 > particular the "array" module).
 >
 > The following code generates an error (traceback message follows
 > code):
 >
 > import pdb
 > import array
 > from numpy import *
 >
[snip]
I think that numpy has a class called "array", so the "import *" will
result in the name "array" binding to that, thus hiding the module
called "array" that you've only just imported!



From cosmo_general at yahoo.com  Wed Feb  4 20:16:00 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Wed, 4 Feb 2009 17:16:00 -0800 (PST)
Subject: How to trigger a smart link?
Message-ID: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>

Hi All,

Using urllib2 can trigger CGI script in server side. However, I
encountered a problem of the so-called smart link. When a fairly large
site, the server needs to track the identifier of each request from
client, so it generated an ugly escape string attached on url. It
seems that I must get this ugly escape string first then I can can
fill the string into my url, and the CGI script on server side can be
triggered. For example,

http://whatever.com/submitreal.cgi?fp=3xD0TuGMp7C7gP1TRD

displays a submit form. If I just copy

http://whatever.com/submitreal.cgi

to url address, without the escape string ?fp=3xD0TuGMp7C7gP1TRD, the
browser will report error of 404

I found Python has a module of escape, but I don't know how to use
this module to solve the problem above. Or, I just wonder does urllib2
has such a method to handle smart link? Thanks!


Moddy Coder


From clp2 at rebertia.com  Wed Feb  4 20:18:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:18:25 -0800
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:
> Using while loop and if statement, I'm trying to get Python to tell me
> whether there are even or odd number of 1's in a binary representation.
> For example, if I give Python a 00000111, then I want it to say that the
> binary representation given has an odd number of 1's.
> If I give it 00010111, then it will tell me that there is an even number of
> 1's.
> I'd appreciate any suggestion.

Please define "binary representation". Do you mean a sequence of
bytes, an integer, a string of 0s and 1s, or something else entirely?

If it's a string of 0s and 1s, then:
is_even = zerosones.count('1') % 2 == 0

For an integer:
is_even = bin(the_int)[2:].count('1') % 2 == 0

For the others, I don't know offhand.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From matzke at berkeley.edu  Wed Feb  4 20:20:06 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Wed, 04 Feb 2009 17:20:06 -0800
Subject: Comparing two book chapters (text files)
Message-ID: <498A3EC6.4040607@berkeley.edu>

Hi all,

So I have an interesting challenge.  I want to compare two book 
chapters, which I have in plain text format, and find out (a) percentage 
similarity and (b) what has changed.

Some features make this problem different than what seems to be the 
standard text-matching problem solvable with e.g. difflib.  Here is what 
I mean:

* there is no guarantee that single lines from each file will be 
directly comparable -- e.g., if a few words are inserted into a 
sentence, then a chunk of the sentence will be moved to the next line, 
then a chunk of that line moved to the next, etc.

* Also, there are cases where paragraphs have been moved around, 
sections re-ordered, etc.  So it can't just be a "linear" match.

I imagine this kind of thing can't be all that hard in the grand scheme 
of things, but I couldn't find an easily applicable solution readily 
available.  I have advanced beginner python skills but am not quite 
where I could do this kind of thing from scratch without some guidance 
about the likely functions, libraries etc. to use.

PS: I am going to have to do this for multiple book chapters so various 
software packages, e.g. for windows, are not really usable.

Any help is much appreciated!!

Cheers,
Nick



-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From todpose at hotmail.com  Wed Feb  4 20:23:46 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:23:46 -0800
Subject: Using while loop and if statement to tell if a binary has an
	odd or even number of 1's.
In-Reply-To: <50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
Message-ID: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>


By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
Also, I'm interested in only using while loop and if statement to accomplish this task.
Thanks.> Date: Wed, 4 Feb 2009 17:18:25 -0800> Subject: Re: Using while loop and if statement to tell if a binary has an odd or even number of 1's.> From: clp2 at rebertia.com> To: todpose at hotmail.com> CC: python-list at python.org> > On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:> > Using while loop and if statement, I'm trying to get Python to tell me> > whether there are even or odd number of 1's in a binary representation.> > For example, if I give Python a 00000111, then I want it to say that the> > binary representation given has an odd number of 1's.> > If I give it 00010111, then it will tell me that there is an even number of> > 1's.> > I'd appreciate any suggestion.> > Please define "binary representation". Do you mean a sequence of> bytes, an integer, a string of 0s and 1s, or something else entirely?> > If it's a string of 0s and 1s, then:> is_even = zerosones.count('1') % 2 == 0> > For an integer:> is_even = bin(the_int)[2:].count('1') % 2 == 0> > For the others, I don't know offhand.> > Cheers,> Chris> > -- > Follow the path of the Iguana...> http://rebertia.com
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From digitig at gmail.com  Wed Feb  4 20:25:50 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 01:25:50 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <aee48b3c0902041725o721ed8datdc052f6bfb69e2cb@mail.gmail.com>

2009/2/5 todpose at hotmail.com <todpose at hotmail.com>:
> Using while loop and if statement, I'm trying to get Python to tell me
> whether there are even or odd number of 1's in a binary representation.
> For example, if I give Python a 00000111, then I want it to say that the
> binary representation given has an odd number of 1's.
> If I give it 00010111, then it will tell me that there is an even number of
> 1's.
> I'd appreciate any suggestion.
> Thanks!

Looks like homework to me, so I'll just give a couple of suggestions.

If you're going to prompt the user for the number, you'll get a string
back, and that might be easier to work with than a number. So you need
to set a boolean value for the result, something like:
   even = True
(because so far you've seen zero 1's, and zero is even).

Then you need to loop over each character in the string -- there's
your loop -- and if (there's your if) it's a "1" change the truth
value of even:
    even = !even.

If it is a number rather than a string, you want to do much the same
thing but you'll need the >> and & operators.

Chris has already shown you how this would actually be done in Python,
but that doesn't match your assignment description.


-- 
Tim Rowe


From clp2 at rebertia.com  Wed Feb  4 20:27:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:27:38 -0800
Subject: How to trigger a smart link?
In-Reply-To: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>
References: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>
Message-ID: <50697b2c0902041727l463235c9pe1fdc55d1ee02942@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:16 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi All,
>
> Using urllib2 can trigger CGI script in server side. However, I
> encountered a problem of the so-called smart link. When a fairly large
> site, the server needs to track the identifier of each request from
> client, so it generated an ugly escape string attached on url. It
> seems that I must get this ugly escape string first then I can can
> fill the string into my url, and the CGI script on server side can be
> triggered. For example,
>
> http://whatever.com/submitreal.cgi?fp=3xD0TuGMp7C7gP1TRD
>
> displays a submit form. If I just copy
>
> http://whatever.com/submitreal.cgi
>
> to url address, without the escape string ?fp=3xD0TuGMp7C7gP1TRD, the
> browser will report error of 404
>
> I found Python has a module of escape, but I don't know how to use
> this module to solve the problem above. Or, I just wonder does urllib2
> has such a method to handle smart link? Thanks!

I think you'll need to fetch whatever webpage contains the link with
the magic URL, and then use an HTML parser (e.g. BeautifulSoup or
lxml) to parse the URL out of the page. Then just fetch the URL you
obtained.
I doubt you can just generate the escape string yourself, you need the
cooperation of the CGI script on the other end; hence the need to
fetch the known page.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From david at boddie.org.uk  Wed Feb  4 20:27:49 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 05 Feb 2009 02:27:49 +0100
Subject: Cross platform compilation?
References: <mailman.8731.1233699257.3487.python-list@python.org>
Message-ID: <gmdfal$5m3$1@get-news01.get.basefarm.net>

On Tuesday 03 February 2009 03:59, John Harper wrote:

> Before I try to reverse engineer completely setup.py, is there
> something obvious that needs to be done to get it to use the right tool
> chain?

I think it's more complicated than that, though in an ideal world it
wouldn't have to be that way.

I created some patches for Python 2.4.4 a while ago to make it slightly
easier to cross-compile it:

  http://chaos.troll.no/~dboddie/Python/Greenphone/

There were patches to solve similar issues with the build system floating
around in the Python bug tracker. I had intended to help push those along
a bit, but lack of time prevented me from doing so.

The magic incantation that worked for me was this:

export HOST_PLATFORM=i386
export TARGET_TOOLS=$SOME_DIR/gcc-4.1.1-glibc-2.3.6/arm-linux/bin
export TARGET_PLATFORM=arm-linux

CC=$TARGET_TOOLS/$TARGET_PLATFORM-gcc \
    CXX=$TARGET_TOOLS/$TARGET_PLATFORM-g++ \
    ./configure --prefix=$TARGETDIR --enable-shared --enable-unicode=ucs4 \
    --build=$TARGET_PLATFORM --host=$HOST_PLATFORM

where SOME_DIR and TARGETDIR are appropriately set, of course. I did
experience issues with some extension modules, though.

> More generally, it seems like this would be something that lots of
> people would want to do. I'm surprised there isn't support for it built
> into the distributed version of Python, without having to hack all the
> setup files...?

I suppose people don't explicitly configure projects for cross-compilation
anymore, especially now that things like Scratchbox are used to fake the
build environment:

  http://www.scratchbox.org/

That might also be worth looking at, but you really have to buy in to its
way of working to use it fully, in my experience.

David


From todpose at hotmail.com  Wed Feb  4 20:28:06 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:28:06 -0800
Subject: Feet and inches
Message-ID: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>


I'm trying to get Python to say:
 
Enter the height (in metres):
 
and convert whatever value to feet and inches. I've done this part as you can see below, but how can I terminate the program when user inputs a height less than 1/2 inch?
How can I also take into account all the cases that need an exception?
 
 
metres = float(raw_input("Enter the height (in metres): "))total_inches = 39.37 * metresfeet = int(total_inches/12)inches = int(round(total_inches - feet*12))if feet>=1:    print "It is " + str(feet) + " feet " + str(inches) + ' inches high.'if feet<1 and inches<0.5:    print "Error."
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From gnewsg at gmail.com  Wed Feb  4 20:36:01 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Wed, 4 Feb 2009 17:36:01 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
Message-ID: <2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>

On 5 Feb, 01:18, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/4 Scott David Daniels <Scott.Dani... at acm.org>:
>
> > joviyach wrote:
>
> >> I am fairly new to Python, the first version I loaded was 2.6. I have
> >> since downloaded 3.0 and I was wondering what the best practice for
> >> upgrading is? I am using Windows XP Pro for my OS.
>
> > On Windows, X.Y.* all go in one directory (over-riding each other)
> > So the whole 2.6.* family should work just fine alongside the 3.0.*
>
> Just don't try to have a 2.6 version of Idle and a 3.0 version of Idle
> running at the same time! 2.6 WinPy and 3.0 Idle seem to coexist ok,
> which is handy when I'm trying to get to grips with the differences
> between versions..
>
> --
> Tim Rowe

Just out of curiosity, am I the only one who think that switching to
3.x right now is not a good idea?


--- Giampaolo
http://code.google.com/p/pyftpdlib


From vincent at vincentdavis.net  Wed Feb  4 20:36:17 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 18:36:17 -0700
Subject: Use list name as string
In-Reply-To: <op.uouqpiaya8ncjz@gnudebst>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
Message-ID: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>

if I start with
M = [1,3,5,7]
M is [1,3,5,7]
This seems one way, as [1,3,5,7] is not M in the sense that there is
no operation I can preform on [1,3,5,7] and get M back. Other than
asking/testing M==[1,3,5,7]
This seems fine to me. but when I savedata(M) it seems I should be
able to refer to both [1,3,5,7] and "M", "I mean I did just type it
why type it again)
My argument comes down to; we use M so we don't have to type
[1,3,5,7], I realize that this is in part because we might not no what
M will be.
This is starting to sound like double talk on my part, I have only
been programing in python for 2 weeks so my credibility is only that
of an outside that MAY have a reasonable way of thinking of this or at
least a feature I would like.

Thanks for the comments

by the way what is "**kwargs" I can't find any documentation on this?


Thanks
Vincent Davis




On Wed, Feb 4, 2009 at 5:09 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> On Wed, 04 Feb 2009 17:23:55 -0000, Vincent Davis <vincent at vincentdavis.net>
> wrote:
>
>> I guess what I am saying is that it does not seem like I am adding any
>> information that is not already there when I have to enter that list and
>> list name after all they are the same.
>> Thanks
>
> But you are.  Consider just for a moment what happens when you execute
> savedata([1, 2, 3, 55]).
>
> Fundamentally, the concept of a single unique name for any object isn't
> something built into the language (or, indeed, most languages I can think
> of).  An object can have no names (though it'll promptly get garbage
> collected if it isn't assigned to a name somehow), or just as easily
> one or many names.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From lionel.keene at gmail.com  Wed Feb  4 20:39:01 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 17:39:01 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
	<mailman.8809.1233789036.3487.python-list@python.org>
	<b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
	<mailman.8816.1233796246.3487.python-list@python.org>
Message-ID: <b5d0e328-be34-4722-83bb-f1e83858ca95@o40g2000prn.googlegroups.com>

On Feb 4, 5:10?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> On Feb 4, 3:10 pm, MRAB <goo... at mrabarnett.plus.com> wrote:?>> Lionel wrote:
>
> ?>>
> ?>> ?> Hello everyone. Quick question: When using the "read()" method in the
> ?>> ?> array module, must I redirect the current file pointer or will that
> ?>> ?> occur automatically?
> ?>> ?>
> ?>> ?> For example, if I were to sequentially read data in chunks from a
> ?>> ?> binary file as in:
> ?>> ?>
> ?>> ?>
> ?>> ?> for currentChunk in range(numberOfChunksToRead):
> ?>> ?>
> ?>> ?> ? ? ? ?floatData = array.array('f')
> ?>> ?> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ?>> ?> ? ? ? ?...go to work on data...
> ?>> ?>
> ?>> ?>
> ?>> ?> at each iteration of the "for" loop, will the next chunk of bytes be
> ?>> ?> read into "floatData" or must I move the file pointer by calling
> "seek
> ?>> ?> ()" or some function like that?
> ?>> ?>
> ?>> The read() method has been deprecated since version Python 1.5.1. Use
> ?>> the fromfile() method instead.
> ?>>
> ?>> It will advance the file pointer.
> ?>
> ?> Thank you, I'll change it. On a related matter, I seem to be making a
> ?> mistake somewhere in the way I'm importing and using modules (in
> ?> particular the "array" module).
> ?>
> ?> The following code generates an error (traceback message follows
> ?> code):
> ?>
> ?> import pdb
> ?> import array
> ?> from numpy import *
> ?>
> [snip]
> I think that numpy has a class called "array", so the "import *" will
> result in the name "array" binding to that, thus hiding the module
> called "array" that you've only just imported!

I believe that's correct. I've gotten it to work by changing the
import statements to:

import pdb
import array
import numpy

and then I qualify the module specific attributes as either
"numpy.SomeAttribute" or "array.SomeAttribute" to avoid this namespace
ambiguity.

Thanks for the input!

L



From clp2 at rebertia.com  Wed Feb  4 20:39:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:39:28 -0800
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
	<BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
Message-ID: <50697b2c0902041739m726936f2w33138add2ffd1f14@mail.gmail.com>

A "byte" is *not* a Python type. My question was what *Python type*
(i.e. bytes (which is distinctly different from the abstract notion of
a byte), str/unicode, int, etc...) you were using for you "binary
representation", which you still haven't answered.
Also, please don't reply by top-posting
(http://en.wikipedia.org/wiki/Top_post#Top-posting), it's bad
netiquette. I'm only doing it in this message for consistency.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


On Wed, Feb 4, 2009 at 5:23 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:
> By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
> Also, I'm interested in only using while loop and if statement to accomplish
> this task.
> Thanks.
>
>> Date: Wed, 4 Feb 2009 17:18:25 -0800
>> Subject: Re: Using while loop and if statement to tell if a binary has an
>> odd or even number of 1's.
>> From: clp2 at rebertia.com
>> To: todpose at hotmail.com
>> CC: python-list at python.org
>>
>> On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com>
>> wrote:
>> > Using while loop and if statement, I'm trying to get Python to tell me
>> > whether there are even or odd number of 1's in a binary representation.
>> > For example, if I give Python a 00000111, then I want it to say that the
>> > binary representation given has an odd number of 1's.
>> > If I give it 00010111, then it will tell me that there is an even number
>> > of
>> > 1's.
>> > I'd appreciate any suggestion.
>>
>> Please define "binary representation". Do you mean a sequence of
>> bytes, an integer, a string of 0s and 1s, or something else entirely?
>>
>> If it's a string of 0s and 1s, then:
>> is_even = zerosones.count('1') % 2 == 0
>>
>> For an integer:
>> is_even = bin(the_int)[2:].count('1') % 2 == 0
>>
>> For the others, I don't know offhand.
>>
>> Cheers,
>> Chris
>>
>> --
>> Follow the path of the Iguana...
>> http://rebertia.com
>
>
> ________________________________
> The new Windows Live Messenger. You don't want to miss this.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From crebert at ucsd.edu  Wed Feb  4 20:41:41 2009
From: crebert at ucsd.edu (Chris Rebert)
Date: Wed, 4 Feb 2009 17:41:41 -0800
Subject: Comparing two book chapters (text files)
In-Reply-To: <498A3EC6.4040607@berkeley.edu>
References: <498A3EC6.4040607@berkeley.edu>
Message-ID: <50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:20 PM, Nick Matzke <matzke at berkeley.edu> wrote:
> Hi all,
>
> So I have an interesting challenge.  I want to compare two book chapters,
> which I have in plain text format, and find out (a) percentage similarity
> and (b) what has changed.
>
> Some features make this problem different than what seems to be the standard
> text-matching problem solvable with e.g. difflib.  Here is what I mean:
>
> * there is no guarantee that single lines from each file will be directly
> comparable -- e.g., if a few words are inserted into a sentence, then a
> chunk of the sentence will be moved to the next line, then a chunk of that
> line moved to the next, etc.
>
> * Also, there are cases where paragraphs have been moved around, sections
> re-ordered, etc.  So it can't just be a "linear" match.
>
> I imagine this kind of thing can't be all that hard in the grand scheme of
> things, but I couldn't find an easily applicable solution readily available.
>  I have advanced beginner python skills but am not quite where I could do
> this kind of thing from scratch without some guidance about the likely
> functions, libraries etc. to use.
>
> PS: I am going to have to do this for multiple book chapters so various
> software packages, e.g. for windows, are not really usable.

Though not written in Python, wdiff
(http://www.gnu.org/software/wdiff/wdiff.html) might be a good
starting point.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From python.list at tim.thechases.com  Wed Feb  4 20:43:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 19:43:15 -0600
Subject: Using while loop and if statement to tell if a binary has an
	odd or	even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <498A4433.7070600@tim.thechases.com>

> Using while loop and if statement, I'm trying to get Python to
> tell me whether there are even or odd number of 1's in a
> binary representation. For example, if I give Python a
> 00000111, then I want it to say that the binary representation
> given has an odd number of 1's. If I give it 00010111, then it
> will tell me that there is an even number of 1's. I'd
> appreciate any suggestion.

A couple come to mind.  First, start by counting the bits.  If 
it's a string, this is easy:

   b = "00010111"
   result = b.count('1')

If it's an integer datatype instead of as string, as long as you 
know the number of bits to expect, you can use

   x = 0xf7
   result = sum((x >> i) & 1 for i in range(8))

where 8 is the number of bits you expect.  If you don't know the 
number of bits to expect, you'd have to do it in a more 
open-ended loop:

   x = 0xDEADBEEF
   result = 0
   while x:
     result += x & 1
     x >>= 1

Once you have the resulting count, you can then check if it's 
even or odd:

   if result & 1:
     print "Odd"
   else:
     print "Even"

Hope this helps,

-tkc






From afriere at yahoo.co.uk  Wed Feb  4 20:44:41 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Wed, 4 Feb 2009 17:44:41 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com> 
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org> 
	<e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com> 
	<mailman.8814.1233794763.3487.python-list@python.org>
Message-ID: <6ff716b0-6111-4b20-b060-b52dea45cf14@w1g2000prm.googlegroups.com>

On Feb 5, 11:45?am, Tim Rowe <digi... at gmail.com> wrote:


[snip]

> Python in a Nutshell states that os.uname "exists only on certain
> platforms", and in the code sample wraps it in a try statement. That
> seems to be the safe way to go -- except (and I don't know much about
> this) wouldn't code have to be digging into some pretty obscure
> corners to find a difference between different posix implementations?

Perhaps not, if the particular posix implementation is Mac OSX.  I
would think that trying os.uname() first and then os.name if it throws
will give you the clearest picture of which OS you are facing.
Alternatively you could query os.name and if that says 'posix' proceed
to call os.uname().


From digitig at gmail.com  Wed Feb  4 20:58:24 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 01:58:24 +0000
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>

2009/2/5 Giampaolo Rodola' <gnewsg at gmail.com>:

> Just out of curiosity, am I the only one who think that switching to
> 3.x right now is not a good idea?

I'm looking at making the switch, but I'm put off by the lack of 3rd
party stuff such as PyWin (and I can't see a NumPy build for Python
2.6 yet, never mind 3.0). Unless all you want is in the standard
library, I think it's worth the general user holding back for a while
whilst the tool providers catch up.


-- 
Tim Rowe


From rhodri at wildebst.demon.co.uk  Wed Feb  4 21:01:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 02:01:12 -0000
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <op.uouvwa0xa8ncjz@gnudebst>

On Thu, 05 Feb 2009 01:28:06 -0000, todpose at hotmail.com  
<todpose at hotmail.com> wrote:

> I'm trying to get Python to say:
> Enter the height (in metres):
> and convert whatever value to feet and inches. I've done this part as  
> you can see below, but [...]

Holy homework, you are busy tonight.  Hang on while I put the line breaks
back in your code.

> metres = float(raw_input("Enter the height (in metres): "))
> total_inches = 39.37 * metres
> feet = int(total_inches/12)
> inches = int(round(total_inches - feet*12))
> if feet>=1:
>    print "It is " +  str(feet) + " feet " + str(inches) + ' inches high.'
> if feet<1 and inches<0.5:
>    print "Error."

First things first: that line printing the result is making life harder
on yourself than you really need to, given that Python's print statement
(in 2.x -- it's a function from 3.0 onwards) will put spaces between items
for you, and will happily print out integers without needing to str() them.

     print "It is", feet, "feet", inches, "inches high."

Since the rest of this smells like homework, I'll answer your question with
questions.

> [...] how can I terminate the program when user inputs a height less
> than 1/2 inch?

First you have to make your program repeat itself, otherwise this question
is meaningless.  How would you do that?

Then, what methods do you have for stopping a loop in Python?  How would
you decide to make one of them happen?  What condition is "a height less
than 1/2 inch" in terms of your program?

(Hint: the condition isn't what I think you think it is -- remember that
"inches" is an int!)

> How can I also take into account all the cases that need an exception?

How do you take care of any exception?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python.list at tim.thechases.com  Wed Feb  4 21:15:47 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 20:15:47 -0600
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <498A4BD3.3080906@tim.thechases.com>

> Enter the height (in metres):
>  
> and convert whatever value to feet and inches. I've done this
> part as you can see below, but how can I terminate the program
> when user inputs a height less than 1/2 inch?

Dang...I got suckered into answering a homework problem for the 
last one.  My apologies to the professor if they eavesdrop on the 
mailing list.  However, given the demonstrated skill level of the 
programmer, if you suspect your student got the answer from my 
reply, a fairly simple tweak of the problem would separate the 
wheat from the chaff.

For this one,

1) you're using the int() function, so fractional inches coming 
from the user don't really matter anyways.

2) read up on the "%" (modulo) operator, or check out the 
divmod() function in Python.

-tkc





From digitig at gmail.com  Wed Feb  4 21:17:08 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 02:17:08 +0000
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <aee48b3c0902041817n7fdbe05cme3b821f09c02c937@mail.gmail.com>

2009/2/5 todpose at hotmail.com <todpose at hotmail.com>:
> I'm trying to get Python to say:
>
> Enter the height (in metres):
>
> and convert whatever value to feet and inches.

This looks like another homework assignment. You'll probably get more
help (on *any* language forum) if you admit that up front. However, at
least this time you've shown us that you've made a good first attempt,
so here are a few hints.

> I've done this part as you
> can see below, but how can I terminate the program when user inputs a height
> less than 1/2 inch?

The program already terminates when the user inputs any height. If you
want it to *keep* asking you need to wrap it in some sort of loop.
Look up "while" and "break".

> How can I also take into account all the cases that need an exception?

I think your code already takes into account all the cases that need
an exception -- you just need to handle the exceptions. Try entering
some silly values for the height (try something like "one point three"
for example) and look at the exception you get. Then look up "try" and
"catch" to see what you might do about it. You might like to think
about what should happen if a user enters a negative value, but the
present behaviour -- when fixed -- may be what you need.

-- 
Tim Rowe


From python.list at tim.thechases.com  Wed Feb  4 21:31:49 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 20:31:49 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
Message-ID: <498A4F95.8050302@tim.thechases.com>

> My argument comes down to; we use M so we don't have to type
> [1,3,5,7], I realize that this is in part because we might not no what
> M will be.
> This is starting to sound like double talk on my part, I have only
> been programing in python for 2 weeks so my credibility is only that
> of an outside that MAY have a reasonable way of thinking of this or at
> least a feature I would like.

The problem (as pointed out elsewhere on the list), an argument 
to a function may have zero or more names at the time the 
function is called.  There *is* *no* canonical name for an 
object. If you want to name an object, pass it as a 
function-argument.  Or use its ID.  However, since Python has the 
flexibility to handle any of the following:

   a = [1,2,3]
   b = [5,6,7]
   c = b

   foo([8,9,10])
   foo(a)
   foo(b)
   foo(c)

While for the b/c name conflict (both refer to the same object), 
might be hackable by sniffing the call-stack, the anonymous 
[8,9,10] argument has *no* name, and thus your function is stuck.

> by the way what is "**kwargs" I can't find any documentation on this?

There's a quick example here:

http://mail.python.org/pipermail/python-list/2007-June/443934.html

-tkc





From dchandran1 at tinkercell.com  Wed Feb  4 21:41:47 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Wed, 4 Feb 2009 18:41:47 -0800
Subject: Embedded python output capture
Message-ID: <5dfe78f40902041841j1424bcacke4239991207507b8@mail.gmail.com>

I have a program with embedded Python. If the python code has print
statements, how do I retrieve those values (which normally go to stdout)?
The output from Py_RunString is just NULL
Thanks.
-------------- next part --------------
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From sjmachin at lexicon.net  Wed Feb  4 21:45:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 4 Feb 2009 18:45:51 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
Message-ID: <283e98d0-8e0d-44eb-b170-43afb70c616f@r15g2000prd.googlegroups.com>

On Feb 5, 9:51?am, Lionel <lionel.ke... at gmail.com> wrote:
> Hello everyone. Quick question: When using the "read()" method in the
> array module, must I redirect the current file pointer or will that
> occur automatically?
>
> For example, if I were to sequentially read data in chunks from a
> binary file as in:
>
> for currentChunk in range(numberOfChunksToRead):
>
> ? ? ? ?floatData = array.array('f')
> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ? ? ? ?...go to work on data...
>
> at each iteration of the "for" loop, will the next chunk of bytes be
> read into "floatData" or must I move the file pointer by calling "seek
> ()" or some function like that?

Suggestions for the the next time you have a question like that:

(1) Consider which outcome is more plausible, write your code
accordingly and see what happens

(2) If it blows up, or if you like looking before you leap anyway, try
inserting temporarily some code -- in this case
  print MyFileHandle.tell()
that will tell you the answer to your question.

In this game you are allowed to experiment to get an answer, and it's
often faster than phone-a-friend :-)


From kmcbrearty at yahoo.com  Wed Feb  4 21:49:21 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Wed, 4 Feb 2009 18:49:21 -0800 (PST)
Subject: JDBC in CPYTHON
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
	<mailman.8802.1233782196.3487.python-list@python.org>
Message-ID: <63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>

Thanks Simon and Marc,

I currently have an app on OSX that I wanted to migrate to NIX, it
uses a ODBC DBAPI interface to communicate with Filemaker.
Unfortunately, FMP does not support linux drivers.  They do have a
JDBC driver that looks like it may work.  My preference was to run
that app on one machine.

I may not be understand your suggestion Marc, can the app and bridge
run on the same machine.  Can I specify the ODBC to a localhost, being
the bridge?  Then have the JDBC driver installed.

Also, your second link does not seam to have a download or anything in
the CVS.

Thanks,
       KMCB



From rhodri at wildebst.demon.co.uk  Wed Feb  4 21:55:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 02:55:04 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
Message-ID: <op.uouyd20ma8ncjz@gnudebst>

On Thu, 05 Feb 2009 01:36:17 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> if I start with
> M = [1,3,5,7]
> M is [1,3,5,7]
> This seems one way, as [1,3,5,7] is not M in the sense that there is
> no operation I can preform on [1,3,5,7] and get M back. Other than
> asking/testing M==[1,3,5,7]

Correct.  If you actually try that, you get this:

Python 2.5.2 (r252:60911, May  7 2008, 15:21:12)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> M = [1,3,5,7]
>>> M is [1,3,5,7]
False

This isn't just me being funny with your suggested syntax, it's
making an important point: the second [1,3,5,7] is an entirely
different object to the list we named M, it just happens to
contain the same data.

> This seems fine to me. but when I savedata(M) it seems I should be
> able to refer to both [1,3,5,7] and "M", "I mean I did just type it
> why type it again)
> My argument comes down to; we use M so we don't have to type
> [1,3,5,7], I realize that this is in part because we might not no what
> M will be.

That's an oversimplification, and you're battering away well past the
point where it works.  In any language, not just Python.

> This is starting to sound like double talk on my part, I have only
> been programing in python for 2 weeks so my credibility is only that
> of an outside that MAY have a reasonable way of thinking of this or at
> least a feature I would like.

The problem is you seem to be thinking in terms of objects having names.
They don't.  Names have objects.

What I mean by that is that when you type "M = [1,3,5,7]", you are saying
"when I say 'M', substitute in this list (not just one that looks like it,
this exact list".  When you type "N = M", similarly you get the name N
bound to the same exact list; if you then type "N[1] = 2" and print out
M, it'll show up as [1,2,5,7] -- it's still the same list under both names.
In effect (to oversimplify more than a bit), Python looks up the name
in a dictionary to get the object it represents.

The reverse lookup doesn't exist, largely because it isn't unique.  Our
[1,3,5,7] list has no idea what names, if any, refer to it, and in all
but the most trivial cases the information isn't really meaningful.
Suppose that we did have a "getvariablename" function, what would you
expect the following code to do?

def f(thing):
     print getvariablename(thing)

m = [1,3,5,7]
for n in m:
     f(n)


Should it say "n" for all of them?  Or "['n', 'thing']", since 'thing'
is after all a perfectly valid name for it?

Then what about this:

for i in range(len(m)):
     f(m[i])


Should it say "m[i]" for all of them, or "m[0]" "m[1]" and so on, or
what?

> by the way what is "**kwargs" I can't find any documentation on this?

http://docs.python.org/tutorial/controlflow.html#keyword-arguments

In a function definition, "**name" mops up all the keyword arguments
to the function that aren't explicit formal parameters into a
dictionary called "name", indexed by keyword.  "kwargs" seems to be
the traditional name to use.  So:

>>> def demo(action, **kwargs):
...   print kwargs
...
>>> demo(action="dummy", text="wombats are go")
{'text': 'wombats are go'}


You can also use it the other way round to expand a dictionary into
keyword parameters to a function call:

>>> myargs = { 'action': 'avoid', 'where': 'Camelot', 'because': 'it is a  
>>> silly place' }
>>> demo(**myargs)
{'because': 'it is a silly place', 'where': 'Camelot'}

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From steve at holdenweb.com  Wed Feb  4 21:58:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 21:58:44 -0500
Subject: Using while loop and if statement to tell if a binary has an
	odd or even number of 1's.
In-Reply-To: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
	<BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
Message-ID: <gmdkl6$5t2$1@ger.gmane.org>

todpose at hotmail.com wrote:
> By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
> Also, I'm interested in only using while loop and if statement
> to accomplish this task.
> Thanks.
> 
I smell homework. Do it yourself!
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb  4 22:15:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 22:15:11 -0500
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>	<mailman.8812.1233793086.3487.python-list@python.org>	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
	<aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>
Message-ID: <498A59BF.1030101@holdenweb.com>

Tim Rowe wrote:
> 2009/2/5 Giampaolo Rodola' <gnewsg at gmail.com>:
> 
>> Just out of curiosity, am I the only one who think that switching to
>> 3.x right now is not a good idea?
> 
> I'm looking at making the switch, but I'm put off by the lack of 3rd
> party stuff such as PyWin (and I can't see a NumPy build for Python
> 2.6 yet, never mind 3.0). Unless all you want is in the standard
> library, I think it's worth the general user holding back for a while
> whilst the tool providers catch up.
> 
> 
Take a look at the recent threads on the topic of the 3.0.1 release on
the python-dev list. There is some feeling that the 3.0 release was
unsatisfactory in certain ways. Some of the issues (including removal of
some obscure features that should have been removed in 3.0) will be
taken care of in 3.0.1.

In addition to that expect a 3.1 release before too long (say, within
the next six months) that will address some performance issues not
addressed in 3.0.1 and provide other optimizations and perhaps a small
list of new features. 3.0 is of remarkably good quality for a ".0"
release. Expect even better things in the future.

If you want to write portable code you can put into production now and
move to 3.0 when appropriate then write for 2.6, and 2.7 when and if it
comes out. Compile it with the -3 option and rewrite until it stops
raising warnings. It will then be relatively easy to move to 3.x when
the third-party library support you need is available.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jervisau at gmail.com  Wed Feb  4 22:24:48 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 5 Feb 2009 14:24:48 +1100
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>

On Thu, Feb 5, 2009 at 3:57 AM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Sorry for not being clear
> I would have something like this
> x = [1, 2, 3,5 ,6 ,9,234]
> Then
> def savedata(dataname): ..........
>
> savedata(x)
> this would save a to a file called x.csv This is my problem, getting the
> name to be x.csv which is the same as the name of the list.
> and the data in the file would be
> 1,2,3,5,6,9,234 this parts works

It sounds like you would _really_ like to attach a name to this list of data.

How about this terrible example to solve your problem.

x = dict(x=[1,2,3,5,6,9,234])

then
def savedata(dataname):
   # extract the first key(name) and value(data) from the dataname data type.
   try:
      name, data = dataname.items()[0]
   except AttributeError:
      raise TypeError("Expecting a datatype that declares method 'items' :).")
   # we could catch other exceptions here but I wont (like empty items).


now you have your name and your data variable.
This way you don't declare your variable name when calling savedata
but when you
create your variable.

Although you should really solve your problem by thinking about it
from a completely
different angle, maybe subclassing your datatype and adding a 'name'
attribute ? I'm
sure some of the others here have suggested that already.

Cheers,


From vincent at vincentdavis.net  Wed Feb  4 22:32:59 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 20:32:59 -0700
Subject: Use list name as string
In-Reply-To: <op.uouyd20ma8ncjz@gnudebst>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
	<op.uouyd20ma8ncjz@gnudebst>
Message-ID: <77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>

"The problem is you seem to be thinking in terms of objects having names.
They don't.  Names have objects."I agree this is my problem. This is not
correct terminology then?
The name of the object is anobject

Let me give another example and let me know if I am just beating a dead
horse.

In my current script I have may print statements to verify I am manipulating
my list as I hope.
I have many lines like;

print 'alist', alist

I need to print the names so I know what I am looking at on the output.
It would be nice if I could define fuction that did this
def lp(thelist):
    "magic occurs"

Then I could just type

lp(alist)

note I am entering the name which has an object that is a list. I am not
entering [1,3,5,7]
and it would

print 'alist' alist

Does it not seem reasonable to what to do this.


Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 7:55 PM, Rhodri James <rhodri at wildebst.demon.co.uk>wrote:

> On Thu, 05 Feb 2009 01:36:17 -0000, Vincent Davis <
> vincent at vincentdavis.net> wrote:
>
>  if I start with
>> M = [1,3,5,7]
>> M is [1,3,5,7]
>> This seems one way, as [1,3,5,7] is not M in the sense that there is
>> no operation I can preform on [1,3,5,7] and get M back. Other than
>> asking/testing M==[1,3,5,7]
>>
>
> Correct.  If you actually try that, you get this:
>
> Python 2.5.2 (r252:60911, May  7 2008, 15:21:12)
> [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>> M = [1,3,5,7]
>>>> M is [1,3,5,7]
>>>>
>>> False
>
> This isn't just me being funny with your suggested syntax, it's
> making an important point: the second [1,3,5,7] is an entirely
> different object to the list we named M, it just happens to
> contain the same data.
>
>  This seems fine to me. but when I savedata(M) it seems I should be
>> able to refer to both [1,3,5,7] and "M", "I mean I did just type it
>> why type it again)
>> My argument comes down to; we use M so we don't have to type
>> [1,3,5,7], I realize that this is in part because we might not no what
>> M will be.
>>
>
> That's an oversimplification, and you're battering away well past the
> point where it works.  In any language, not just Python.
>
>  This is starting to sound like double talk on my part, I have only
>> been programing in python for 2 weeks so my credibility is only that
>> of an outside that MAY have a reasonable way of thinking of this or at
>> least a feature I would like.
>>
>
> The problem is you seem to be thinking in terms of objects having names.
> They don't.  Names have objects.
>
> What I mean by that is that when you type "M = [1,3,5,7]", you are saying
> "when I say 'M', substitute in this list (not just one that looks like it,
> this exact list".  When you type "N = M", similarly you get the name N
> bound to the same exact list; if you then type "N[1] = 2" and print out
> M, it'll show up as [1,2,5,7] -- it's still the same list under both names.
> In effect (to oversimplify more than a bit), Python looks up the name
> in a dictionary to get the object it represents.
>
> The reverse lookup doesn't exist, largely because it isn't unique.  Our
> [1,3,5,7] list has no idea what names, if any, refer to it, and in all
> but the most trivial cases the information isn't really meaningful.
> Suppose that we did have a "getvariablename" function, what would you
> expect the following code to do?
>
> def f(thing):
>    print getvariablename(thing)
>
> m = [1,3,5,7]
> for n in m:
>    f(n)
>
>
> Should it say "n" for all of them?  Or "['n', 'thing']", since 'thing'
> is after all a perfectly valid name for it?
>
> Then what about this:
>
> for i in range(len(m)):
>    f(m[i])
>
>
> Should it say "m[i]" for all of them, or "m[0]" "m[1]" and so on, or
> what?
>
>  by the way what is "**kwargs" I can't find any documentation on this?
>>
>
> http://docs.python.org/tutorial/controlflow.html#keyword-arguments
>
> In a function definition, "**name" mops up all the keyword arguments
> to the function that aren't explicit formal parameters into a
> dictionary called "name", indexed by keyword.  "kwargs" seems to be
> the traditional name to use.  So:
>
>  def demo(action, **kwargs):
>>>>
>>> ...   print kwargs
> ...
>
>> demo(action="dummy", text="wombats are go")
>>>>
>>> {'text': 'wombats are go'}
>
>
> You can also use it the other way round to expand a dictionary into
> keyword parameters to a function call:
>
>  myargs = { 'action': 'avoid', 'where': 'Camelot', 'because': 'it is a
>>>> silly place' }
>>>> demo(**myargs)
>>>>
>>> {'because': 'it is a silly place', 'where': 'Camelot'}
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From vincent at vincentdavis.net  Wed Feb  4 22:37:04 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 20:37:04 -0700
Subject: Use list name as string
In-Reply-To: <8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
Message-ID: <77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>

Jervis Whitley wrote "Although you should really solve your problem by
thinking about it
from a completely different angle, maybe subclassing your datatype and
adding a 'name'
attribute ? I'm sure some of the others here have suggested that already."
That is beyond my current knowledge. Any suggestions for reading about this?

Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 8:24 PM, Jervis Whitley <jervisau at gmail.com> wrote:

> On Thu, Feb 5, 2009 at 3:57 AM, Vincent Davis <vincent at vincentdavis.net>
> wrote:
> > Sorry for not being clear
> > I would have something like this
> > x = [1, 2, 3,5 ,6 ,9,234]
> > Then
> > def savedata(dataname): ..........
> >
> > savedata(x)
> > this would save a to a file called x.csv This is my problem, getting the
> > name to be x.csv which is the same as the name of the list.
> > and the data in the file would be
> > 1,2,3,5,6,9,234 this parts works
>
> It sounds like you would _really_ like to attach a name to this list of
> data.
>
> How about this terrible example to solve your problem.
>
> x = dict(x=[1,2,3,5,6,9,234])
>
> then
> def savedata(dataname):
>   # extract the first key(name) and value(data) from the dataname data
> type.
>   try:
>      name, data = dataname.items()[0]
>   except AttributeError:
>      raise TypeError("Expecting a datatype that declares method 'items'
> :).")
>   # we could catch other exceptions here but I wont (like empty items).
>
>
> now you have your name and your data variable.
> This way you don't declare your variable name when calling savedata
> but when you
> create your variable.
>
> Although you should really solve your problem by thinking about it
> from a completely
> different angle, maybe subclassing your datatype and adding a 'name'
> attribute ? I'm
> sure some of the others here have suggested that already.
>
> Cheers,
>
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From matzke at berkeley.edu  Wed Feb  4 22:38:57 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Wed, 04 Feb 2009 19:38:57 -0800
Subject: Comparing two book chapters (text files)
In-Reply-To: <50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>
References: <498A3EC6.4040607@berkeley.edu>
	<50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>
Message-ID: <498A5F51.4030900@berkeley.edu>



Chris Rebert wrote:
> On Wed, Feb 4, 2009 at 5:20 PM, Nick Matzke <matzke at berkeley.edu> wrote:
>> Hi all,
>>
>> So I have an interesting challenge.  I want to compare two book chapters,
>> which I have in plain text format, and find out (a) percentage similarity
>> and (b) what has changed.
>>
>> Some features make this problem different than what seems to be the standard
>> text-matching problem solvable with e.g. difflib.  Here is what I mean:
>>
>> * there is no guarantee that single lines from each file will be directly
>> comparable -- e.g., if a few words are inserted into a sentence, then a
>> chunk of the sentence will be moved to the next line, then a chunk of that
>> line moved to the next, etc.
>>
>> * Also, there are cases where paragraphs have been moved around, sections
>> re-ordered, etc.  So it can't just be a "linear" match.
>>
>> I imagine this kind of thing can't be all that hard in the grand scheme of
>> things, but I couldn't find an easily applicable solution readily available.
>>  I have advanced beginner python skills but am not quite where I could do
>> this kind of thing from scratch without some guidance about the likely
>> functions, libraries etc. to use.
>>
>> PS: I am going to have to do this for multiple book chapters so various
>> software packages, e.g. for windows, are not really usable.
> 
> Though not written in Python, wdiff
> (http://www.gnu.org/software/wdiff/wdiff.html) might be a good
> starting point.


Wow -- this is actually amazingly effective.  And fast!   Simple to run 
from python & then use python to parse the output.

Thanks!
Nick


> 
> Cheers,
> Chris
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From jervisau at gmail.com  Wed Feb  4 22:53:28 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 5 Feb 2009 14:53:28 +1100
Subject: Use list name as string
In-Reply-To: <77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
	<77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>
Message-ID: <8e63a5ce0902041953r300ddf75h87760d0752a7f8e7@mail.gmail.com>

On Thu, Feb 5, 2009 at 2:37 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Jervis Whitley wrote "Although you should really solve your problem by
> thinking about it
> from a completely different angle, maybe subclassing your datatype and
> adding a 'name'
> attribute ? I'm sure some of the others here have suggested that already."
> That is beyond my current knowledge. Any suggestions for reading about this?
> Thanks
> Vincent Davis

Here is a short example, more information on 'Inheritance' can be obtained from
http://docs.python.org/tutorial/classes.html

class NamedList(list):
    """A List with a 'name' attribute."""
    def __init__(self, name, *args, **keyword_arguments):
        list.__init__(self, *args, **keyword_arguments)
        self.name = name


you can now do this

x = NamedList('x', [1,2,3,4])
>>> x.name
'x'

In this example I have inherited all the features of the original
built-in list, and added my
own initialisation method.

of course this is only a minimal example and there are other
approaches (such as adding an attribute
at runtime) but this one
is self documenting to some extent.

Cheers,


From aahz at pythoncraft.com  Thu Feb  5 00:09:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 Feb 2009 21:09:58 -0800
Subject: Use list name as string
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<mailman.8810.1233792569.3487.python-list@python.org>
Message-ID: <gmdsb6$18$1@panix3.panix.com>

In article <mailman.8810.1233792569.3487.python-list at python.org>,
Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>
>Fundamentally, the concept of a single unique name for any object isn't
>something built into the language (or, indeed, most languages I can think
>of).  An object can have no names (though it'll promptly get garbage
>collected if it isn't assigned to a name somehow), or just as easily
>one or many names.

Slight tangent: I prefer to use "binding target" ("target" for short) for
the generic term describing the left-hand side of an assignment
statement.  Consider

L[1] = C()

(where L is a list and C is a class)

It seems to me that while L and C are properly described as names, L[1]
is not really a name, it's an expression describing the location to be
used for binding.  (The Python docs also use this terminology, at least
some parts of them.)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From timr at probo.com  Thu Feb  5 00:35:30 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 05 Feb 2009 05:35:30 GMT
Subject: Find the critical points
References: <1b1b6f12-c910-4a13-902d-3523bfe8e3f5@u18g2000pro.googlegroups.com>
Message-ID: <3huko41tkcr916ijv7eimuev6baapbod6i@4ax.com>

antoniosacchi85 at gmail.com wrote:
>
>someone can help me??
>I am new to programing,
>but I need to make some script like this:
>http://blogs.nyu.edu/blogs/agc282/zia/2008/11/using_python_to_solve_optimiza.html
>so th equestion is :
>is possible to open it than it ask something and it tell me the
>result??

I'm not exactly sure what you're asking.  The script as you wrote it works,
but it was designed to be entered from the interactive interpreter, so if
you run it in a script it won't print anything.  Basically, just add
"print" in front of the expressions that you want printed:

>import sympy as S
>x,y=S.symbols('xy')
>f=x**4+x**2-6*x*y+3*y**2
>a=S.diff(f,x)
>S.pprint(a)
>b=S.diff(f,y)
>S.pprint(b)
>S.solve_system([a,b],[x,y])

print S.solve_system([a,b],[x,y])

>H=S.hessian(f,[x,y])
>M1=S.Matrix([14,-6],[-6,6])
>M2=S.Matrix([2,-6],[-6,6])
>S.Matrix.berkowitz_minors(M2)
>S.Matrix.berkowitz_minors(M1)

print S.Matrix.berkowitz_minors(M2)
print S.Matrix.berkowitz_minors(M1)
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tim--at-- at frontier--dot--.net  Thu Feb  5 01:35:13 2009
From: tim--at-- at frontier--dot--.net (Tim H)
Date: Wed, 04 Feb 2009 23:35:13 -0700
Subject: time: Daylight savings confusion
Message-ID: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>

On Win XP 64bit, Python 2.6.1 64bit

I am trying to rename files by their creation time.

It seems the time module is too smart for its own good here.

time.localtime(os.path.getctime(f)) returns a value one hour off from 
what windows reports for files that were created when Daylight savings 
time was in effect (ie when the tm_isdst field is one).  I can kludge 
it, but am I missing the "right" way to do it?

Tim

full code:
import os, time

filetypes = (".avi")

skipped = []
for f in os.listdir("."):
     root, ext = os.path.splitext(f)
     if ext in filetypes:
         creation_time = time.localtime(os.path.getctime(f))
         newname = time.strftime("%Y-%m-%d_%H%M" + ext, creation_time)
         if os.path.exists(newname):
             skipped.append(newname)
         else:
             os.rename(f, newname)
             print f, "->", newname
     else:
         skipped.append(f)

print
print "These files were skipped:"
for sf in skipped:
     print sf


From spacebar265 at gmail.com  Thu Feb  5 01:48:13 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Wed, 4 Feb 2009 22:48:13 -0800 (PST)
Subject: Scanning a file character by character
Message-ID: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>

Hi. Does anyone know how to scan a file character by character and
have each character so I can put it into a variable. I am attempting
to make a chatbot and need this to read the saved input to look for
spelling mistakes and further analysis of user input.
Thanks
Spacebar265


From mail at microcorp.co.za  Thu Feb  5 02:03:03 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 5 Feb 2009 09:03:03 +0200
Subject: Use list name as string
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com><77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<4989D545.4030409@mrabarnett.plus.com>
Message-ID: <012101c98765$78df0c20$0d00a8c0@hendrik>

 "MRAB" <google at mr....ett.plus.com> wrote:

> The actual names of the variables and functions shouldn't matter to the
> outside world; the name of an output file shouldn't depend on the name
> of a variable.

That is a matter of opinion. 
It is however, an interesting problem, namely:

How does one get hold of the actual name by which some parameter
is passed?

you may want to print, as a debug thingy:

print "the name passed in was: ", ImpossibleThingYieldingName
print "and it evaluates to:" , ArgumentPassed

to help you see from where your function was called,
and you can't, as far as I know, do this, because there 
is no backwards link from the object to all of its various names.

And while the OP can solve his problem by passing in the name explicitly,
as doStuff("banana",banana) it will do him no good if he gets the list 
returned from something else:

doStuff(WhatMustGoHere?,getlist())

Because in such a situation there is no backwards link to a name.

So to the OP :

Sorry - you can't get there from here.

- Hendrik




From elzapp at gmail.com  Thu Feb  5 02:03:06 2009
From: elzapp at gmail.com (Bard Aase)
Date: Wed, 4 Feb 2009 23:03:06 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <f5a45535-4bd4-454b-898e-c4f8c1953ec1@e18g2000vbe.googlegroups.com>

On 5 Feb, 07:48, Spacebar265 <spacebar... at gmail.com> wrote:
> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.
> Thanks
> Spacebar265

You can read one byte at the time using the read() method on the file-
object.
http://docs.python.org/library/stdtypes.html#file.read

e.g.:
f=open("myfile.txt")
byte=f.read(1)


From xahlee at gmail.com  Thu Feb  5 03:47:56 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 5 Feb 2009 00:47:56 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
Message-ID: <03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>

looking at the eXtreme Programing fuckheads's traffic history:
http://groups.google.com/group/comp.software.extreme-programming/about

for those who are not aware, it was one of the snake oil wildly
popular in around 2001.

  Xah
? http://xahlee.org/

?


Jason wrote:
I just started reading OnLisp and hit this quote:

Why wait for hindsight? As Montaigne found, nothing clarifies your
ideas like trying to write them down. Once you?re freed from the worry
that you?ll paint yourself into a corner, you can take full advantage
of this possibility. The ability to plan programs as you write them
has two momentous consequences: programs take less time to write,
because when you plan and write at the same time, you have a real
program to focus your attention; and they turn out better, because the
final design is always a product of evolution. So long as you maintain
a certain discipline while searching for your program?s destiny?so
long as you always rewrite mistaken parts as soon as it becomes clear
that they?re mistaken?the final product will be a program more elegant
than if you had spent weeks planning it beforehand.

I've always heard "design is 90% of the job. You have to have a good
design in place before writing anything."

This quote from OnLisp is a radical paradigm for me (being an engineer
who designs things). My question to you is does this apply in
practice? In the real world when the rubber hits the road, can you
program this way and develop good software used by lots of people?


-----------------

On Feb 4, 10:36 pm, Xah Lee <xah... at gmail.com> wrote:

yes and no. The problem is that such opinion is not a scientific
opinion. It can't be verified or denied.

Any dynamic lang, such as Python, PHP, Ruby, Mathematica can be said
the same thing. And, prob more so for functional langs.

The langs that this cannot be done, is C, Java, where the lang is
inflexible, low level, or requires big structure that's hard to
change.

if you want software engineering books, i suggest try some books that
are based on statistical survey, as opposed to some dignitary's
?opinion? or current fashion & trends that comes with a jargon. These
type of books are a dime a dozen, every year, they come and go. The
stastical survey approach takes major understaking and cost. The
opinion type any motherfucking ?guru? can write. e.g. Paul Graham has
you buy into certain concept of ?hackers? fucker and claim they are
like ?painters?. Certain Gabriel wants you to believe in poetry and C
is the last language. (see Book Review: Patterns of
Softwarehttp://xahlee.org/PageTwo_dir/Personal_dir/bookReviewRichardGabriel.html
) et al. Certain Gosling wants you to believe Java is the last lang on
earth that'll wipe out Microsoft (circa 1998).

Pascal Constanza wrote:
> Yes. There are actually complete software development methodologies
> built around these ideas. Google for "extreme programming" and "agile
> software methodologies".

Pascal Constanza is a Common Lisp fanatic. Note here, that eXtreme
Programing is one of the snake oil, that ran like rampant wild fire in
the industry around 2002, with many books published on it on the
supposed motherfucking hip Software Engineering practices, but today
you don't hear much of it. I haven't looked at ?Agile programing?
agile my ass, but it is probably a waste of time.

... what society overwhelmingly asks for is snake oil. Of course, the
snake oil has the most impressive names ?otherwise you would be
selling nothing? like ?Structured Analysis and Design?, ?Software
Engineering?, ?Maturity Models?, ?Management Information Systems?,
?Integrated Project Support Environments? ?Object Orientation? and
?Business Process Re-engineering? (the latter three being known as
IPSE, OO and BPR, respectively).? ? Edsger W Dijkstra (1930-2002), in
EWD 1175: The strengths of the academic enterprise.

you want to be a good programer? Study math, the math of programing,
and master the langs and protocols and tools you use. You want to
climb the tech industry ladder? get better at people, learn politics.
You want to be rich? Study business. Chances are, you are a coding
geek, and at heart you dna is not geared to be interested in politics
or business, and you'll never be rich or big ceo just because of that.

See also:
? Why Software Suck
 http://xahlee.org/UnixResource_dir/writ/why_software_suck.html

  Xah
? http://xahlee.org/

?



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 04:00:24 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 10:00:24 +0100
Subject: is python Object oriented??
In-Reply-To: <5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<49895bad$0$28683$426a74cc@news.free.fr>
	<5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>
Message-ID: <498aaa94$0$14156$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 4, 3:11 am, Bruno Desthuilliers <bruno.
> 42.desthuilli... at websiteburo.invalid> wrote:
>> thmpsn.... at gmail.com a ?crit :
>>
>>
>>
>>> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
>> (snip)
>>>> after all, we have used FILE* for years and I have no idea about the FILE
>>>> structure.
>>> Your lack of knowledge about it doesn't mean that it has somehow
>>> magically "private" members. The only reason that most of us don't
>>> know what a FILE is is that it's definition is implementation-defined
>>> (i.e., every compiler may define it differently).
>>> That doesn't have anything to do with private members. For example, on
>>> my system, <stdio.h> defines FILE as:
>>> struct _iobuf {
>>>         char *_ptr;
>>>         int   _cnt;
>>>         char *_base;
>>>         int   _flag;
>>>         int   _file;
>>>         int   _charbuf;
>>>         int   _bufsiz;
>>>         char *_tmpfname;
>>>         };
>> Didn't you notice kind of a pattern here ?
> 
> You mean the leading underscores? I don't think they're used for the
> same purpose as in Python. 

Not exactly the same purpose, indeed, but there's still something close: 
mark the names as "special".

> In C/C++, identifiers that begin with an
> underscore are reserved (at least at the outer level). Thus, if the
> member '_ptr' would instead be named 'ptr', something like this would
> break things:
> 
> #define ptr // OOPS!!
> #include <stdio.h>
> 
> That shouldn't happen with '_ptr', since programs are not supposed to
> define those kinds of names (yeah, right).

And here again : "would break", "shouldn't", "supposed". Convention over 
enforcement.

>>> typedef struct _iobuf FILE;
>>> Given this information, nothing prevents me from writing things like:
>>> FILE* fp = fopen("file.txt", "r");
>>> if (!fp) { /* do something */ }
>>> printf("fp->_cnt = %d\n", fp->cnt);
>>> printf("fp->_flag = %d\n", fp->_flag);
>>> printf("fp->_file = %d\n", fp->_file);
>>> fp->_flag = 0x20; // OOPS!!
 >>
>> Indeed - and that's exactly the point : nothing prevents you from
>> accessing the implementation, *and yet, you don't*
> 
> I sure don't, but I still *can*.

So what ?

> CHAOS MAY ENSUE!!

C is not really a new technology, and has been the basis for most 
systems for years and years. Looks like nothing that bad as "CHAOS" 
really happened so far...


From dickinsm at gmail.com  Thu Feb  5 04:04:57 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 01:04:57 -0800 (PST)
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
References: mailman.8817.1233796709.3487.python-list@python.org
Message-ID: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>

On Feb 5, 1:18?am, Chris Rebert <c... at rebertia.com> wrote:
> For an integer:
> is_even = bin(the_int)[2:].count('1') % 2 == 0

But the OP has to use if and while.  How about:

while 2+2 != 5:
    if 'wkw' in 'just being awkward':
        is_even = bin(the_int)[2:].count('1') % 2 == 0
        break

or (Python 2.5 compatible):

def count_set_bits(n):
    # make sure we include an if, to
    # satisfy OP's requirements:
    if n < 0:
        raise ValueError
    count = 0
    while n:
        count += 1
        n &= n-1
    return count

is_even = count_set_bits(the_int) % 2 == 0

...but anyone submitting this as a homework
solution had better be prepared to explain why
it works.


Mark


From matzke at berkeley.edu  Thu Feb  5 04:08:25 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 01:08:25 -0800
Subject: global name 'sqrt' is not defined
Message-ID: <498AAC89.5080002@berkeley.edu>

Hi all,

So, I can run this in the ipython shell just fine:

===========
a = ["12", "15", "16", "38.2"]
dim = int(sqrt(size(a)))

dim
 >2
===========


But if I move these commands to a function in another file, it freaks out:


=================================
a = distances_matrix.split('\t')
from LR_run_functions_v2 import make_half_square_array
d = make_half_square_array(a)

 >
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/bioinformatics/phylocom/<ipython console> in <module>()

/bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
make_half_square_array(linear_version_of_square_array)
    1548
    1549         a = linear_version_of_square_array
-> 1550         dim = int(sqrt(size(a)))
    1551
    1552

NameError: global name 'sqrt' is not defined

=================================




Here's the function in LR_run_functions_v2.py

==========================
def make_half_square_array(linear_version_of_square_array):

	a = linear_version_of_square_array
	dim = int(sqrt(size(a)))
==========================



Any ideas?  If I do something like "import math" in the subfunction, 
then the error changes to "global name 'math' is not defined".

Thanks!
Nick







-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From tino at wildenhain.de  Thu Feb  5 04:13:24 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 10:13:24 +0100
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <498AADB4.3060704@wildenhain.de>

Hi,

Vincent Davis wrote:
> Sorry for not being clear
> I would have something like this
> x = [1, 2, 3,5 ,6 ,9,234]
> 
> Then
> def savedata(dataname): ..........
> 
> savedata(x)
> 
> this would save a to a file called x.csv This is my problem, getting the 
> name to be x.csv which is the same as the name of the list.
> 
> and the data in the file would be 
> 1,2,3,5,6,9,234 this parts works

the problem you are facing comes from a little misunderstanding.
To clarify:

python objects are nameless.

You can bind them to any number of names (aka variables)

 >>> 1 # unnamed integer object with value 1
1

 >>> a=1 # bind the integer object to name 'a'
 >>> b=a # bind the same integer object referred to by name a to name b

therefore in your above example, which "name" should your
savedata pick up for the filename? the 'x' of the first
assignment or the 'dataname' of the assignment in the function
call?

The only solution I see would be to add a property to your datastore
to give it its own unique name. (By subclassing and providing
a name attribute or property) - and while you are at it, maybe
you want to put the 'write to file' part into the class as well.

Regards
Tino

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From crebert at ucsd.edu  Thu Feb  5 04:19:44 2009
From: crebert at ucsd.edu (Chris Rebert)
Date: Thu, 5 Feb 2009 01:19:44 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <498AAC89.5080002@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
Message-ID: <50697b2c0902050119p65b0df7ei9cef4af4cc724986@mail.gmail.com>

On Thu, Feb 5, 2009 at 1:08 AM, Nick Matzke <matzke at berkeley.edu> wrote:
> Hi all,
>
> So, I can run this in the ipython shell just fine:
>
> ===========
> a = ["12", "15", "16", "38.2"]
> dim = int(sqrt(size(a)))

sqrt() is not a builtin function, it's located in the 'math' module.
You must have imported it at some point.
Or it could be be getting imported without your direct knowledge
through ~/.pythonrc.py, $PYTHONSTARTUP, and/or by doing 'import user'
For that matter, size() is not built into Python either, so you're
definitely importing these things somewhere.

Adding explicit imports of the modules/functions in question to the
top of the file(s) in question should fix the problem.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Ron.Barak at lsi.com  Thu Feb  5 04:27:38 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 5 Feb 2009 09:27:38 +0000
Subject: How to find wxPython method documentation??
In-Reply-To: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E6875B3@enbmail01.lsi.com>

Hi Len,
First off, there's the wxPython mailing list 
(To subscribe or unsubscribe via the World Wide Web, visit http://lists.wxwidgets.org/mailman/listinfo/wxpython-users or, via email, send a message with subject or body 'help' to wxpython-users-request at lists.wxwidgets.org)
I also find Google invaluable in searching for wxPython knowledge, e.g., try http://www.google.com/search?q=wxpython+dialog.
Bye,
Ron.

From egon.frerich at nord-com.net  Thu Feb  5 04:30:19 2009
From: egon.frerich at nord-com.net (Egon Frerich)
Date: Thu, 05 Feb 2009 10:30:19 +0100
Subject: How to find wxPython method documentation??
In-Reply-To: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <498AB1AB.3030307@nord-com.net>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

The documentation is here:

http://www.wxpython.org/onlinedocs.php

In "Alphabetical class reference" you can find for example wxButton with
its methods. Yes - there is no function 'SetBackgroundColour'. But there
is a list with classes from which wxButton is derived.
'SetBackgroundColour' is a method for all widgets so it is described in
~ class wxWindow.

Egon
len schrieb:
| Hi
|
| I am going through the "wxPython in Action" book by Noel Rappin and
| Robin Dunn.
|
| I have been typing in the example programs as I go and play with
| modifing the code.
| Thought I should start trying to find my way around the documentation
| found on the wxPython web site.
|
| The problem I have been having is I can't find the methods or more
| specifically
|
| 'SetBackgroundColour' or 'AddSimpleTool' for example.
|
| How does one find the methods that are available in the classes.
|
| I tried looking at the wxWidgets web site and still had the same
| problem.
|
| Could someone give me a little direction in this?
|
| Thanks
| Len
| --
| http://mail.python.org/mailman/listinfo/python-list

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From tino at wildenhain.de  Thu Feb  5 04:39:24 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 10:39:24 +0100
Subject: Use list name as string
In-Reply-To: <012101c98765$78df0c20$0d00a8c0@hendrik>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com><77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>	<4989D545.4030409@mrabarnett.plus.com>
	<012101c98765$78df0c20$0d00a8c0@hendrik>
Message-ID: <498AB3CC.3050806@wildenhain.de>

Hendrik van Rooyen wrote:
 >  "MRAB" <google at mr....ett.plus.com> wrote:
 >
 >> The actual names of the variables and functions shouldn't matter to the
 >> outside world; the name of an output file shouldn't depend on the name
 >> of a variable.
 >
 > That is a matter of opinion.
 > It is however, an interesting problem, namely:
 >
 > How does one get hold of the actual name by which some parameter
 > is passed?
 >
 > you may want to print, as a debug thingy:
 >
 > print "the name passed in was: ", ImpossibleThingYieldingName
 > print "and it evaluates to:" , ArgumentPassed

This is possible to some degree:

import inspect

def F(a):
     frame_obj,filename,line_no,
     func_name,contextlines,
     contextindex=(inspect.getouterframes(inspect.currentframe()))[1]
         print "F(%s) called from '%s' within '%s' line %d" %
               (repr(a),filename,func_name,line_no)
         for ln,srcline in enumerate(contextlines or []):
             print "%3s : %s" % ('*>' if ln==contextindex else '',srcline)


just play around calling the above function from different
places and you should see what I mean :-)

Regards
Tino
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From mnordhoff at mattnordhoff.com  Thu Feb  5 04:39:47 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 05 Feb 2009 09:39:47 +0000
Subject: time: Daylight savings confusion
In-Reply-To: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
References: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
Message-ID: <498AB3E3.1060804@mattnordhoff.com>

Tim H wrote:
> On Win XP 64bit, Python 2.6.1 64bit
> 
> I am trying to rename files by their creation time.
> 
> It seems the time module is too smart for its own good here.
> 
> time.localtime(os.path.getctime(f)) returns a value one hour off from
> what windows reports for files that were created when Daylight savings
> time was in effect (ie when the tm_isdst field is one).  I can kludge
> it, but am I missing the "right" way to do it?
> 
> Tim
> 
> full code:

<snip full code>

>From what I remember, this is a bug in the Win32 API. Python probably
could hack around it, but, well, I guess it doesn't.

Googling a bit, Perl's Win32::UTCFileTime module [1] provides
workarounds (not for Python, of course, but it could probably be ported)
and explains all the gory details (which I have not read, so maybe I
misunderstand ;-).

[1]
<http://search.cpan.org/~shay/Win32-UTCFileTime-1.50/lib/Win32/UTCFileTime.pm>
<http://xrl.us/beezsv>
-- 


From dickinsm at gmail.com  Thu Feb  5 04:40:52 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 01:40:52 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org> 
	<42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com> 
	<mailman.8805.1233783892.3487.python-list@python.org>
Message-ID: <5aa92561-8fec-4568-b19f-87ddc0c971e5@g1g2000pra.googlegroups.com>

On Feb 4, 9:44?pm, Tim Rowe <digi... at gmail.com> wrote:
> That just leaves me puzzled as to why Mark Summerfield used it instead
> of a check against zero on user input.

No idea:  you'd have to ask Mark Summerfield.  If there's
an email address published in his book, I'm sure he
wouldn't object to the question.

> So my next question is whether there is any x that can
> be returned by float() such that x != 0 but some_number / (2 * x)
> raises a ZeroDivisionError?

Nope.  If x is nonzero, then 2*x is definitely nonzero.
It could be an infinity, or a nan, or the '2*x'
computation could raise an exception, or perhaps
cause the interpreter to crash (it shouldn't, but
you never know...), but it's never going to be zero.

Well, okay, *never* is a strong word:  if 2*x is
subnormal, and you're operating on a platform that
for whatever reasons flushes subnormal results
to zero, then it could happen.  But not in *real*
life. :)

Mark


From andrew at acooke.org  Thu Feb  5 04:42:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 5 Feb 2009 01:42:05 -0800 (PST)
Subject: Comparing two book chapters (text files)
References: <mailman.8818.1233796861.3487.python-list@python.org>
Message-ID: <72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>

On Feb 4, 10:20?pm, Nick Matzke <mat... at berkeley.edu> wrote:
> So I have an interesting challenge. ?I want to compare two book
> chapters, which I have in plain text format, and find out (a) percentage
> similarity and (b) what has changed.

no idea if it will help, but i found this yesterday - http://www.nltk.org/

it's a python toolkit for natural language processing.  there's a book
at http://www.nltk.org/book with much more info.

andrew


From justin.mailinglists at gmail.com  Thu Feb  5 04:46:25 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 5 Feb 2009 01:46:25 -0800 (PST)
Subject: How do i add body to email.mime.multipart.MIMEMultipart instance?
References: <mailman.8835.1233801992.3487.python-list@python.org>
Message-ID: <69442cd1-7c20-4752-9280-ccaf237de218@r36g2000prf.googlegroups.com>

On Feb 4, 2:48?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Hi,
> Could someone tell me the way to add body to the instance email.mime.multipart.MIMEMultipart instance which has attachments?
>
> Thanks,

msg = MIMEMultipart()
msg.preamble = 'This is a multi-part message in MIME format.\n'
msg.epilogue = ''

body = MIMEMultipart('alternative')
body.attach(MIMEText(text))
body.attach(MIMEText(html, 'html'))

msg.attach(body)

attachment = Message()
attachment.add_header('Content-type', content_type,
                      name=basename)
attachment.add_header('Content-transfer-encoding', 'base64')
attachment.add_header('Content-Disposition', 'attachment',
                      filename=basename)
attachment.set_payload(b.getvalue())

msg.attach(attachment)

msg.add_header('Message-ID', generate_message_id(sender[1]))
msg.add_header('Date', strftime(DATEFORMAT, gmtime()))

msg.add_header('From', formataddr(sender))
msg.add_header('To', format_addresses(TOs))
msg.add_header('Cc', format_addresses(CCs))
msg.add_header('Subject', subj)



From bearophileHUGS at lycos.com  Thu Feb  5 04:47:24 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 01:47:24 -0800 (PST)
Subject: Ordered dict by default
Message-ID: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>

Choosing the right data structure is usually a matter of compromises,
and sometimes the best you can do is to change some data structures
and look for the faster running time. To do this it helps to have a
language that allows you to swap data structures in the more
transparent way possible.

It's not just a matter of the specific program, it's also a matter of
the nature of the programming language. Python isn't meant to be high-
performance in running time, it's meant to be easy to use, flexible,
and easy to understand. (Ruby shares almost the same purposes, but it
looks a bit less easy, a bit more flexible, and offers a bit more
freedom, and it used to be a little slower).

Now Ruby dicts are ordered by default:
http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/

Of course Python can grow odicts into its collections module, that can
be used everywhere a normal dict is used. But while this may be a good
solution for faster languages like Java, C# and D, for me it doesn't
sound like the best solution for Python.

That page about Ruby dicts show a higher traversal speed (probably
just because the CPU has to scan less memory, but I am not sure,
because mordern CPUs are very complex) but lower insertion speed (I
think mostly not because the added management of two pointers, but
because the memory used increases, so there are more cache misses. If
this turns out as true, then using the xor trick may halve the extra
memory needed). I have no idea if such different balance of
performance will lead to on average faster or slower Python programs,
this has to be tested. But even if the average performance becomes a
little worse I think making the default Python dict as ordered is a
positive change for Python too, because built-ins are meant to be as
flexible as possible, even if they aren't the fastest ones or the less
memory hungry ones (and keeping dicts ordered decreases the surprises
a newbie finds, makes some code cleaner, and doctests become simpler
to write because the order of items may be more defined).

Once the default dicts are ordered, it can be possible to add an
unordereddict to the collections module to be used by programmers when
max performance or low memory usage is very important :-)

Namespaces and other internal things of Python can keep using the un-
ordereddicts.

I don't know what to do regarding Python sets yet. In mathematics sets
aren't ordered, so they may be kept as they are now.

Bye,
bearophile


From duncan.booth at invalid.invalid  Thu Feb  5 04:56:51 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 09:56:51 GMT
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
Message-ID: <Xns9BA9651C7D77Aduncanbooth@127.0.0.1>

Mark Dickinson <dickinsm at gmail.com> wrote:

> def count_set_bits(n):
>     # make sure we include an if, to
>     # satisfy OP's requirements:
>     if n < 0:
>         raise ValueError
>     count = 0
>     while n:
>         count += 1
>         n &= n-1
>     return count
> 
> is_even = count_set_bits(the_int) % 2 == 0
> 
> ...but anyone submitting this as a homework
> solution had better be prepared to explain why
> it works.
> 

I remember a programming exercise when I was an undergraduate and anyone 
who *didn't* use that trick got marked down for writing inefficient code.

-- 
Duncan Booth http://kupuguy.blogspot.com


From robin at reportlab.com  Thu Feb  5 05:10:17 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 05 Feb 2009 10:10:17 +0000
Subject: x64 speed
In-Reply-To: <498A080D.3000703@egenix.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>	<4988BAE8.2060204@v.loewis.de>	<49896AA0.2050202@chamonix.reportlab.co.uk>
	<498A080D.3000703@egenix.com>
Message-ID: <498ABB09.3050507@chamonix.reportlab.co.uk>

.......
>>> ----------------------------------------------------------------------
>>> Ran 193 tests in 27.841s
>>>
>>> OK
>>>
>>> real    0m28.150s
>>> user    0m26.606s
>>> sys     0m0.917s
>>> [rptlab at localhost tests]$
>> magical how the total python time is less than the real time.
> 
> time(1) also measures the Python startup and shutdown time, so
> I don't quite see the magic :-(
>

yes stupid me :(

> FWIW: VMware VMs need the VMware tools installed to make their
> clocks work more or less. With Linux, you need some extra tweaks
> as well, otherwise the clocks are just completely unreliable.
> 

I do have the tools installed and from what I can see the clock isn't so far 
off. At least when I run the two tests side by side the vm run always finishes 
first. Of course that could be because vmware is stealing cpu somehow.

> See these notes:
> 
> http://kb.vmware.com/selfservice/viewContent.do?language=en_US&externalId=1420
> http://communities.vmware.com/message/782173
> 


-- 
Robin Becker



From digitig at gmail.com  Thu Feb  5 05:10:31 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 10:10:31 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
Message-ID: <aee48b3c0902050210v42eef9abr84fcf62ddcdbe6fa@mail.gmail.com>

2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:
> Mark Dickinson <dickinsm at gmail.com> wrote:
>
>> def count_set_bits(n):
>>     # make sure we include an if, to
>>     # satisfy OP's requirements:
>>     if n < 0:
>>         raise ValueError
>>     count = 0
>>     while n:
>>         count += 1
>>         n &= n-1
>>     return count
>>
>> is_even = count_set_bits(the_int) % 2 == 0
>>
>> ...but anyone submitting this as a homework
>> solution had better be prepared to explain why
>> it works.
>>
>
> I remember a programming exercise when I was an undergraduate and anyone
> who *didn't* use that trick got marked down for writing inefficient code.

Is adding and a modulus *really^ more efficient than flipping a bool
as I suggested? I think I'd want to see measurements!


-- 
Tim Rowe


From robin at reportlab.com  Thu Feb  5 05:12:15 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 05 Feb 2009 10:12:15 +0000
Subject: x64 speed
In-Reply-To: <4989ee71$0$3356$9b622d9e@news.freenet.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4989ee71$0$3356$9b622d9e@news.freenet.de>
Message-ID: <498ABB7F.6060006@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>> Is it the
>> x64 working faster at its design sizes
> 
> Another guess (still from the darkness of not having received the
> slightest clue what the test actually does): if it creates integers
> in range(2**32, 2**64), then they fit into a Python int on AMD64-Linux,
> but require a Python long on 32-bit Windows; long operations are much
> slower than int operations.
> 
......
I don't think we're doing a lot of bignum arithmetic, some masking operations 
etc etc.

-- 
Robin Becker



From tino at wildenhain.de  Thu Feb  5 05:21:44 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 11:21:44 +0100
Subject: Comparing two book chapters (text files)
In-Reply-To: <72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>
References: <mailman.8818.1233796861.3487.python-list@python.org>
	<72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>
Message-ID: <498ABDB8.1000001@wildenhain.de>

andrew cooke wrote:
> On Feb 4, 10:20 pm, Nick Matzke <mat... at berkeley.edu> wrote:
>> So I have an interesting challenge.  I want to compare two book
>> chapters, which I have in plain text format, and find out (a) percentage
>> similarity and (b) what has changed.
> 
> no idea if it will help, but i found this yesterday - http://www.nltk.org/
> 
> it's a python toolkit for natural language processing.  there's a book
> at http://www.nltk.org/book with much more info.

Also there is difflib in the standard package which can be used
depending on exact definition of "similarity".

Regards
Tino
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From steve at holdenweb.com  Thu Feb  5 05:22:35 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 05:22:35 -0500
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <gmeeld$25d$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
[a somewhat feeble case for ordered dicts]
> Once the default dicts are ordered, it can be possible to add an
> unordereddict to the collections module to be used by programmers when
> max performance or low memory usage is very important :-)
> 
I have no real idea why you think it's desirable to turn this important
feature on its head, but if you've followed the various past threads on
ordered dicts you would know that one of the prime issues every time
this comes up is the inability of the various proponents to agree no ow
dicts should actually be ordered.

> Namespaces and other internal things of Python can keep using the un-
> ordereddicts.
> 
> I don't know what to do regarding Python sets yet. In mathematics sets
> aren't ordered, so they may be kept as they are now.
> 
In mathematics mappings aren't ordered either, and a pure dict is pretty
much a mapping. So leave them alone, they are fine as they are!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From http  Thu Feb  5 05:25:03 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 02:25:03 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <7x7i45qiyo.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> Now Ruby dicts are ordered by default:
> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/

Maybe I didn't read that carefully enough, but it looks like "ordered"
means the dict records come out in the same order you inserted them
in.  That is if you insert B,A,D,C in that order, you get them out in
that order.  I would have thought an ordered dict meant you get A,B,C,D,
which seems a lot more useful.

Red-black trees as described at the bottom of the page are a good way
to get A,B,C,D.  They also make it simple to have "persistent" or
"functional" dictionaries, which I've written about a few times before.


From http  Thu Feb  5 05:28:04 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 02:28:04 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<mailman.8855.1233829373.3487.python-list@python.org>
Message-ID: <7x3aetqitn.fsf@ruckus.brouhaha.com>

Steve Holden <steve at holdenweb.com> writes:
> In mathematics mappings aren't ordered either, and a pure dict is pretty
> much a mapping. So leave them alone, they are fine as they are!

Ehhh, an ordered dict has to support a comparison operation on the
keys, while a Python dict has to support a hashing operation on them.
Neither really captures the idea of a pure mapping, which shouldn't
have to support any operations (even equality) on the keys.

There have been several times when I've wished for persistent ordered
dicts in Python.  I started writing a big post about it a while ago
and maybe I'll finish it someday.


From duncan.booth at invalid.invalid  Thu Feb  5 05:47:52 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 10:47:52 GMT
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
	<mailman.8852.1233828636.3487.python-list@python.org>
Message-ID: <Xns9BA96DBE047Cduncanbooth@127.0.0.1>

Tim Rowe <digitig at gmail.com> wrote:

> 2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:
>> Mark Dickinson <dickinsm at gmail.com> wrote:
>>
>>> def count_set_bits(n):
>>>     # make sure we include an if, to
>>>     # satisfy OP's requirements:
>>>     if n < 0:
>>>         raise ValueError
>>>     count = 0
>>>     while n:
>>>         count += 1
>>>         n &= n-1
>>>     return count
>>>
>>> is_even = count_set_bits(the_int) % 2 == 0
>>>
>>> ...but anyone submitting this as a homework
>>> solution had better be prepared to explain why
>>> it works.
>>>
>>
>> I remember a programming exercise when I was an undergraduate and
>> anyone who *didn't* use that trick got marked down for writing
>> inefficient code. 
> 
> Is adding and a modulus *really^ more efficient than flipping a bool
> as I suggested? I think I'd want to see measurements!
> 
> 
I meant the bitwise twiddling, but actually I misread it. I thought Mark 
was using the n&~n+1 trick to pull out bits from least significant upwards 
when of course he's just clearing the low bit not extracting it.


-- 
Duncan Booth http://kupuguy.blogspot.com


From simon at mullis.co.uk  Thu Feb  5 05:50:05 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 11:50:05 +0100
Subject: parse date/time from a log entry with only strftime (and no 
	regexen)
In-Reply-To: <7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
	<mailman.8702.1233679732.3487.python-list@python.org>
	<7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>
Message-ID: <23d7e1bb0902050250k60cceb46jf7c1149f0b1e024@mail.gmail.com>

That, my friend, is ingenious...!

Thankyou

SM

2009/2/3 andrew cooke <andrew at acooke.org>

> > > ValueError: unconverted data remains:  this is the remainder of the log
>
> > > line
> > > that I do not care about
>
> you could catch the ValueError and split at the ':' in the .args
> attribute to find the extra data.  you could then find the extra data
> in the original string, use the index to remove it, and re-parse the
> time.
>
> ugly, but should work.
> andrew
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Simon Mullis
_________________
simon at mullis.co.uk
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From simon at mullis.co.uk  Thu Feb  5 05:58:48 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 11:58:48 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
Message-ID: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>

Hi All

I've written a simple python script that accepts both stdin and a glob (or
at least, that is the plan).
Unfortunately, the glob part seems to hang when it's looped through to the
end of the filehandle.

And I have no idea why... ;-)

sys.stdin and a normal file opened with "open" seem to both be identical
filehandles.

>>> import sys
>>> foo = sys.stdin
>>> type(foo)
<type 'file'>
>>> repr(foo)
"<open file '<stdin>', mode 'r' at 0x16020>"

>>> bar = open("test_file", 'r')
>>> type(bar)
<type 'file'>
>>> repr(bar)
"<open file 'test_file', mode 'r' at 0x3936e0>"

The stdin version is fine. I want to re-use the code for scan_data (and all
of the other processing methods) so I'd like to be able to iterate over one
line at a time, independently of the source (i.e. either file or stdin)

Code that illustrates the issue follows:

# cat test_fh.py

#!/usr/bin/env python
import glob, os, sys
class TestParse(object):
    def __init__(self):
        if (options.stdin):
              self.scan_data(sys.stdin)
        if (options.glob):
              self.files = glob.glob(options.glob)
                      for f in files:
                              fh = open(f, 'r')
                              self.scan_data(fh)
                              fh.close()

    def scan_data(self,fileobject):
                i = int()
        for line in fileobject:
                        print i
                        i += 1
                        # do stuff with the line...
                        pass
               print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
        p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob")
        p.add_option("--stdin", dest="stdin", action="store_true",
default="False")
        (options, args) = p.parse_args()
        main()

#EOF

Running this against stdin outputs a count of lines and then exits fine
(exit code 0).

# cat test_file | ./test-fh.py --stdin
...output...
# echo $?
0

Running against --glob "test_file" just hangs.....

# ./test_fh.py --glob "test_file"
....wait 20 seconds or so...
^CTraceback (most recent call last):
  File "./test_fh.py", line 35, in <module>
    main()
  File "./test_fh.py", line 26, in main
    T = TestParse()
  File "./test_fh.py", line 8, in __init__
    self.scan_data(sys.stdin)
  File "./test_fh.py", line 18, in scan_data
    for line in fileobject:
KeyboardInterrupt
 # echo $?
1

So, what am I doing wrong?

Thanks in advance

SM

-- 
Simon Mullis
_________________
simon at mullis.co.uk
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From duncan.booth at invalid.invalid  Thu Feb  5 06:08:09 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 11:08:09 GMT
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <Xns9BA9703C478C6duncanbooth@127.0.0.1>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.
> 
If you want to write doctests then any stable order in the default dict 
type would be helpful no matter whether it means that keys are in original 
insertion or latest insertion order or sorted.

There are other use cases where maintaining insertion order is important. 
For example any automated code generator which parses its previous output 
and then regenerates it maintaining edits. I ran into that before with one 
which just stored the methods in a Python dict so that every so often you'd 
find the entire source file had rearranged itself making a mess of version 
control.

It would certainly be an interesting experiment to mimic the Ruby dict 
implementation in Python's dict code and see what effect it has on 
performance: the Ruby page claims that while inserts are slower traversal 
is much faster. I think it would need some pretty convincing arguments 
though to become the default.

-- 
Duncan Booth http://kupuguy.blogspot.com


From clp2 at rebertia.com  Thu Feb  5 06:12:18 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 03:12:18 -0800
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
Message-ID: <50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>

On Thu, Feb 5, 2009 at 2:58 AM, Simon Mullis <simon at mullis.co.uk> wrote:
> Hi All
>
> I've written a simple python script that accepts both stdin and a glob (or
> at least, that is the plan).
> Unfortunately, the glob part seems to hang when it's looped through to the
> end of the filehandle.
>
> And I have no idea why... ;-)
>
> sys.stdin and a normal file opened with "open" seem to both be identical
> filehandles.
>
>>>> import sys
>>>> foo = sys.stdin
>>>> type(foo)
> <type 'file'>
>>>> repr(foo)
> "<open file '<stdin>', mode 'r' at 0x16020>"
>
>>>> bar = open("test_file", 'r')
>>>> type(bar)
> <type 'file'>
>>>> repr(bar)
> "<open file 'test_file', mode 'r' at 0x3936e0>"
>
> The stdin version is fine. I want to re-use the code for scan_data (and all
> of the other processing methods) so I'd like to be able to iterate over one
> line at a time, independently of the source (i.e. either file or stdin)
>
> Code that illustrates the issue follows:
>
> # cat test_fh.py
>
> #!/usr/bin/env python
> import glob, os, sys
> class TestParse(object):
>     def __init__(self):
>         if (options.stdin):
>               self.scan_data(sys.stdin)
>         if (options.glob):
>               self.files = glob.glob(options.glob)
>                       for f in files:
>                               fh = open(f, 'r')
>                               self.scan_data(fh)
>                               fh.close()
>
>     def scan_data(self,fileobject):
>                 i = int()
>         for line in fileobject:
>                         print i
>                         i += 1
>                         # do stuff with the line...
>                         pass
>                print "finished file"

I'd add some print()s in the above loop (and also the 'for f in files'
loop) to make sure the part of the code you didn't want to share ("do
stuff with the line") works correctly, and that nothing is improperly
looping in some unexpected way.

Also, there are several series of lines with invalid indentation;
could be an email artifact or could be the cause of your problem. If
the print()s don't yield any useful insight, repost the code again
with absolutely correct indentation.

Finally, some stylistic points:
- don't do 'if (foo):'   use the less noisy 'if foo:' instead
- don't do 'i = int()'   use the more obvious 'i = 0' instead

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 06:15:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 12:15:22 +0100
Subject: Understanding descriptors
In-Reply-To: <mailman.8322.1233272628.3487.python-list@python.org>
References: <mailman.8322.1233272628.3487.python-list@python.org>
Message-ID: <498aca36$0$24804$426a74cc@news.free.fr>

Brian Allen Vanderburg II a ?crit :
> I'm trying to better understand descriptors and I've got a few questions 
> still after reading some sites.  Here is what I 'think', but please let 
> me know if any of this is wrong as I'm sure it probably is.
> 
> 
> First when accessing an attribute on a class or instance it must be 
> found.  For an instance, it's __dict__ is first search.

Actually, this is not true - binding descriptors are searched (in the 
class and it's mro) _before_ the instance's __dict__ :

 >>> class Foo(object):
...     @apply
...     def bar():
...         def fget(self):
...             return self._bar
...         def fset(self, v):
...             self._bar = v
...         return property(**locals())
...
 >>> f = Foo()
 >>> f.bar = 42
 >>> f.bar
42
 >>> f.__dict__['bar'] = "boo"
 >>> f.bar
42
 >>> f.__dict__['bar']
'boo'
 >>>

Note that this works a bit differently for non-binding descriptors 
(descriptors that only implement the __get__ method), which are looked 
up after the instance's __dict__

So the lookup chain is:

1/ lookup the class and bases for a binding descriptor
2/ then lookup the instance's __dict__
3/ then lookup the class and bases for a non-binding descriptor or plain 
attribute
4/ then class __getattr__

Also and FWIW, there's a "step zero" : calls __getattribute__. All the 
above lookup mechanism is actually implemented by object.__getattribute__.

>  If not found 
> the class and base class __dict__ are searched.  For a class, the 
> __dict__ and base classes __dict__ are search.
> 
> If assigning, and the attribute is found and is not a descriptor

a binding descriptor

> or if 
> the attribute is not found, then the assignment will occur in the 
> __dict__ of the class or instance.  If it is found and is a descriptor, 

a binding descriptor

> then __set__ will be call.


> For reading, if the attribute is found and is a descriptor, __get__ will 
> be called, passing the object (if it is an instance) and class.  If it 
> is not a descriptor, the attribute will be returned directly.
> 
> Class methods are just functions:

In Python, "classmethod" has a definite meaning - it's a method that 
takes the class (and not the instance) as first argument. So your 
assertion should be "Methods are just functions which are attributes of 
the class". Which is still not quite true. Sure, the def statement 
always create function objects, regardless of whether it happens within 
a class statement or not. OTHO, what you get when looking up the 
corresponding attribute is definitly a method object. So the correct 
formulation here is (IMHO of course) that methods are implemented by 
functions that are attributes of the class. Also, this is not restricted 
to functions : any callable object correctly implementing the descriptor 
protocol can be used (cf the classmethod and staticmethod objects).

> class C(object):
>    def F(self):
>       pass
> 
> C.__dict__['F'] # function object ...

yes.

> But functions are descriptors:

yes.

> C.__dict__['F'].__get__ # method wrapper ...
> 
> def f1():
>    pass
> 
> f1.__get__ # method wrapper ...
> 
> When a lookup is done it uses this descriptor to make a bound or unbound 
> method:

yes.

> c=C()
> 
> C.F # unbound method object, expects explicit instance when calling the 
> function
> c.F # bound method object provides instance implicitly when calling the 
> function
> 
> This is also done when adding to the classes:

Indeed. Whether the def statement happens within the class statement or 
not is irrelevant here.

> C.f1 = f1
> 
> f1 # function
> C.f1 # unbound method
> c.f1 # bound method
> 
> To prevent this it has to be decorated so the descriptor doesn't cause 
> the binding:
> 
> C.f2 = staticmethod(f1)
> C.f2 # functon
> c.f2 # function

yes.

> Here is a question, why don't instance attributes do the same thing?

Because the descriptor protocol is only invoked on class attributes.

> c.f3 = f1
> c.f3 # function, not bound method
> 
> So it is not calling the __get__ method for c.f3  After it finds c.f3 in 
> c.__dict__, and since it has a getter, shouldn't it call the __get__ to 
> return the bound method.

Nope, cf above.

>  It is good that it doesn't I know, but I just 
> want to know why it doesn't from an implementation view.

If by "from an implementation view", you mean "how it works", then the 
answer is above. If your question was about "why this design choice", 
I'll leave the answer to someone else...


From thomasvangurp at gmail.com  Thu Feb  5 06:16:46 2009
From: thomasvangurp at gmail.com (thomasvangurp at gmail.com)
Date: Thu, 5 Feb 2009 03:16:46 -0800 (PST)
Subject: Python 3.0 slow file IO
Message-ID: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>

I just recently learned python, I'm using it mainly to process huge
<5GB txt files of ASCII information about DNA. I've decided to learn
3.0, but maybe I need to step back to 2.6?

I'm getting exceedingly frustrated by the slow file IO behaviour of
python 3.0. I know that a bug-report was submitted here:
http://bugs.python.org/issue4533. And a solution was posted.
However, i don't know how to apply this patch. I've searched the
forums and tried:
C:\python30> patch -p0 < fileio_buffer.patch
The patch command is not recognized..

Any help on implementing this patch, or advice on moving back to the
older version is appreciated.
Kind regards,
Thomas


From http  Thu Feb  5 06:25:52 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 03:25:52 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<Xns9BA9703C478C6duncanbooth@127.0.0.1>
Message-ID: <7xmyd1rupr.fsf@ruckus.brouhaha.com>

Duncan Booth <duncan.booth at invalid.invalid> writes:
> If you want to write doctests then any stable order in the default dict 
> type would be helpful no matter whether it means that keys are in original 
> insertion or latest insertion order or sorted.

Just use "sorted" in the test code:
  >>> print sorted(dict((a**2,a) for a in xrange(5)).keys())
  [0, 1, 4, 9, 16]

> There are other use cases where maintaining insertion order is
> important.  For example any automated code generator which parses
> its previous output and then regenerates it maintaining edits. I ran
> into that before with one which just stored the methods in a Python
> dict so that every so often you'd find the entire source file had
> rearranged itself making a mess of version control.

Still doesn't sound so bad: just include a counter with the value.
Something like (untested):

   odict = dict(zip(methodnames, zip(methodbodies, itertools.count())))
   ...
   gen_code(sorted(odict.iteritems(), key=lambda(name,(body,n)): n))

> It would certainly be an interesting experiment to mimic the Ruby dict 
> implementation in Python's dict code and see what effect it has on 
> performance: the Ruby page claims that while inserts are slower traversal 
> is much faster. I think it would need some pretty convincing arguments 
> though to become the default.

In my usage of dicts, traversal is rather rare, but YMMV.


From eckhardt at satorlaser.com  Thu Feb  5 06:33:44 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Thu, 05 Feb 2009 12:33:44 +0100
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
Message-ID: <qdvq56-9ff.ln1@satorlaser.homedns.org>

thomasvangurp at gmail.com wrote:
> C:\python30> patch -p0 < fileio_buffer.patch
> The patch command is not recognized..

You need the 'patch' program first. Further, you will need a C compiler. If
you don't know how to compile from sources, I would postpone patching
sources to after learning that.

> [...] advice on moving back to the older version is appreciated.

Just install the latest 2.6 release. I think you can easily install it
alongside 3.0, all you need to pay attention to is the "PATH" environment
variable.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From lists at cheimes.de  Thu Feb  5 06:40:18 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 12:40:18 +0100
Subject: Python 3.0 slow file IO
In-Reply-To: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
Message-ID: <gmej72$heu$1@ger.gmane.org>

thomasvangurp at gmail.com schrieb:
> I just recently learned python, I'm using it mainly to process huge
> <5GB txt files of ASCII information about DNA. I've decided to learn
> 3.0, but maybe I need to step back to 2.6?
> 
> I'm getting exceedingly frustrated by the slow file IO behaviour of
> python 3.0. I know that a bug-report was submitted here:
> http://bugs.python.org/issue4533. And a solution was posted.
> However, i don't know how to apply this patch. I've searched the
> forums and tried:
> C:\python30> patch -p0 < fileio_buffer.patch
> The patch command is not recognized..

You need the Python sources, a patch utility and Microsoft Visual Studio
2008 in order to compile Python yourself.
> 
> Any help on implementing this patch, or advice on moving back to the
> older version is appreciated.

I suggest you stick with Python 2.5 or 2.6. Python 3.0 isn't as mature
as the 2.x series. It's brand new, lot's of things have changed, too.



From s.selvamsiva at gmail.com  Thu Feb  5 06:40:35 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Thu, 5 Feb 2009 17:10:35 +0530
Subject: string replace for back slash
Message-ID: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>

Hi all,

I tried to do a string replace as follows,

>>> s="hi & people"
>>> s.replace("&","\&")
'hi \\& people'
>>>

but i was expecting 'hi \& people'.I dont know ,what is something different
here with escape sequence.

-- 
Yours,
S.Selvam
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From digitig at gmail.com  Thu Feb  5 06:45:25 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 11:45:25 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <Xns9BA96DBE047Cduncanbooth@127.0.0.1>
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
	<mailman.8852.1233828636.3487.python-list@python.org>
	<Xns9BA96DBE047Cduncanbooth@127.0.0.1>
Message-ID: <aee48b3c0902050345w65912ed2s95f171f0755b798a@mail.gmail.com>

2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:

>>> I remember a programming exercise when I was an undergraduate and
>>> anyone who *didn't* use that trick got marked down for writing
>>> inefficient code.
>>
>> Is adding and a modulus *really^ more efficient than flipping a bool
>> as I suggested? I think I'd want to see measurements!
>>
>>
> I meant the bitwise twiddling, but actually I misread it. I thought Mark
> was using the n&~n+1 trick to pull out bits from least significant upwards
> when of course he's just clearing the low bit not extracting it.

Ah, ok. Yes, that's faster than my bit shifting. A million bytes with
your method on my computer with your bit-twiddling takes 1.047
seconds, with my bit-shifting it takes 1.578. On the other hand,
unless that was demonstrated to be a bottleneck I'd still go for the
bit shifting because I think it's clearer. And I'd want a word with a
tutor who insisted on premature optimisation ("The root of all evil",
according to C A R Hoare), especially in a scripting language!

-- 
Tim Rowe


From mal at egenix.com  Thu Feb  5 06:47:03 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 12:47:03 +0100
Subject: JDBC in CPYTHON
In-Reply-To: <63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>	<mailman.8802.1233782196.3487.python-list@python.org>
	<63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>
Message-ID: <498AD1B7.5010803@egenix.com>

On 2009-02-05 03:49, KMCB wrote:
> Thanks Simon and Marc,
> 
> I currently have an app on OSX that I wanted to migrate to NIX, it
> uses a ODBC DBAPI interface to communicate with Filemaker.
> Unfortunately, FMP does not support linux drivers.  They do have a
> JDBC driver that looks like it may work.  My preference was to run
> that app on one machine.
> 
> I may not be understand your suggestion Marc, can the app and bridge
> run on the same machine.  Can I specify the ODBC to a localhost, being
> the bridge?  Then have the JDBC driver installed.

The setup would work as follows:

Python -> mxODBC -> ODBC-JDBC bridge -> JDBC driver -> Filemaker

[--- Linux ----------------------------------------]   [Mac OS X]

I am not sure how you'd have to configure the EasySoft bridge.
Please check their documentation for details.

We are currently working on releasing mxODBC Connect, our client server
Python database interface, for Mac OS X. You will then be able
to use a much simpler and more efficient setup:

Python -> mxODBC Connect Client ->
[--- Linux --------------------]

mxODBC Connect Server -> ODBC driver -> Filemaker
[--- Mac OS X -----------------------------------]

and because the mxODBC Connect Cient is highly portable, moving
your application to other platforms would be easily possible
as well.

Plus, you'd avoid having to carry around the whole JVM in your
Python application: the ODBC-JDBC bridge essentially embeds
the JVM in your application and then uses JNI to interface
from C to Java and from there to the JDBC driver.

> Also, your second link does not seam to have a download or anything in
> the CVS.

Sorry, I should have looked closer... the SF project page reveals
that the "PROJECT IS DEAD!":

   http://sourceforge.net/projects/odbcjdbc/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From clp2 at rebertia.com  Thu Feb  5 06:59:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 03:59:16 -0800
Subject: string replace for back slash
In-Reply-To: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
Message-ID: <50697b2c0902050359y57812425pb31dbb561672b0a0@mail.gmail.com>

On Thu, Feb 5, 2009 at 3:40 AM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
>
> I tried to do a string replace as follows,
>
>>>> s="hi & people"
>>>> s.replace("&","\&")
> 'hi \\& people'
>>>>
>
> but i was expecting 'hi \& people'.I dont know ,what is something different
> here with escape sequence.

The Python interactive interpreter does an implicit repr() (consult
the docs if you're unfamiliar with the repr() function) on the return
value of the expression. Note the single quotes in the output, which
obviously wouldn't be present in the string itself; same thing with
the doubling of the backslash.
If you instead do `print s.replace("&","\&")`, you'll see that the
outputted string does indeed only contain 1 backslash.

It's a common newbie confuser, there really should be a FAQ about it;
pity there isn't.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mal at egenix.com  Thu Feb  5 07:00:30 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 13:00:30 +0100
Subject: Comparing two book chapters (text files)
In-Reply-To: <498A3EC6.4040607@berkeley.edu>
References: <498A3EC6.4040607@berkeley.edu>
Message-ID: <498AD4DE.4080703@egenix.com>

On 2009-02-05 02:20, Nick Matzke wrote:
> Hi all,
> 
> So I have an interesting challenge.  I want to compare two book
> chapters, which I have in plain text format, and find out (a) percentage
> similarity and (b) what has changed.
> 
> Some features make this problem different than what seems to be the
> standard text-matching problem solvable with e.g. difflib.  Here is what
> I mean:
> 
> * there is no guarantee that single lines from each file will be
> directly comparable -- e.g., if a few words are inserted into a
> sentence, then a chunk of the sentence will be moved to the next line,
> then a chunk of that line moved to the next, etc.
> 
> * Also, there are cases where paragraphs have been moved around,
> sections re-ordered, etc.  So it can't just be a "linear" match.
> 
> I imagine this kind of thing can't be all that hard in the grand scheme
> of things, but I couldn't find an easily applicable solution readily
> available.  I have advanced beginner python skills but am not quite
> where I could do this kind of thing from scratch without some guidance
> about the likely functions, libraries etc. to use.
> 
> PS: I am going to have to do this for multiple book chapters so various
> software packages, e.g. for windows, are not really usable.
> 
> Any help is much appreciated!!

difflib is in the Python stdlib and provides many ways to implement
difference detection:

    http://docs.python.org/library/difflib.html

Here's a script that I use for diff'ing text files on a word
basis, called tdiff.py:

    http://downloads.egenix.com/python/tdiff.py

It helps a lot with text that gets word wrapped or reformatted.

Cheers,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mal at egenix.com  Thu Feb  5 07:01:33 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 13:01:33 +0100
Subject: global name 'sqrt' is not defined
In-Reply-To: <498AAC89.5080002@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
Message-ID: <498AD51D.5000609@egenix.com>

On 2009-02-05 10:08, Nick Matzke wrote:
> Hi all,
> 
> So, I can run this in the ipython shell just fine:
> 
> ===========
> a = ["12", "15", "16", "38.2"]
> dim = int(sqrt(size(a)))
> 
> dim
>>2
> ===========
> 
> 
> But if I move these commands to a function in another file, it freaks out:

You need to add:

from math import sqrt

> =================================
> a = distances_matrix.split('\t')
> from LR_run_functions_v2 import make_half_square_array
> d = make_half_square_array(a)
> 
>>
> ---------------------------------------------------------------------------
> NameError                                 Traceback (most recent call last)
> 
> /bioinformatics/phylocom/<ipython console> in <module>()
> 
> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in
> make_half_square_array(linear_version_of_square_array)
>    1548
>    1549         a = linear_version_of_square_array
> -> 1550         dim = int(sqrt(size(a)))
>    1551
>    1552
> 
> NameError: global name 'sqrt' is not defined
> 
> =================================
> 
> 
> 
> 
> Here's the function in LR_run_functions_v2.py
> 
> ==========================
> def make_half_square_array(linear_version_of_square_array):
> 
>     a = linear_version_of_square_array
>     dim = int(sqrt(size(a)))
> ==========================
> 
> 
> 
> Any ideas?  If I do something like "import math" in the subfunction,
> then the error changes to "global name 'math' is not defined".
> 
> Thanks!
> Nick
> 
> 
> 
> 
> 
> 
> 

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From BrianVanderburg2 at aim.com  Thu Feb  5 07:04:40 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 07:04:40 -0500
Subject: Understanding descriptors
In-Reply-To: <498aca36$0$24804$426a74cc@news.free.fr>
References: <mailman.8322.1233272628.3487.python-list@python.org>
	<498aca36$0$24804$426a74cc@news.free.fr>
Message-ID: <498AD5D8.50501@aim.com>

bruno.42.desthuilliers at websiteburo.invalid wrote:
>
> So the lookup chain is:
>
> 1/ lookup the class and bases for a binding descriptor
> 2/ then lookup the instance's __dict__
> 3/ then lookup the class and bases for a non-binding descriptor or 
> plain attribute
> 4/ then class __getattr__
>
> Also and FWIW, there's a "step zero" : calls __getattribute__. All the 
> above lookup mechanism is actually implemented by 
> object.__getattribute__.

Okay, so instance attributes never use their __get__/__set__/etc when 
looking up.

A binding descriptor is one that has a __set__ (even if it doesn't do 
anything) and it takes priority over instance variables.  Properties are 
binding descriptors even if they don't have a set function specified.  A 
non-binding descriptor doesn't have __set__ and instance variables take 
priority over them. 

For reading:

1. Lookup in the class/bases for a binding descriptor and if found use 
its __get__
2. If instance, look up in instance __dict__ and if found return it
3. Lookup in the class/bases
    a. if found and a descriptor use it's __get__
    b. if found and not a descriptor return it
4. Use __getattr__ (if instance?)

For writing:

1. If instance
    a. lookup in the class/bases for a binding descriptor and if found 
use its __set__
    b. write to instance __dict__
2. If class, write in class __dict__


I think I understand it now.  Thanks.

Brian Vanderburg II


From duncan.booth at invalid.invalid  Thu Feb  5 07:19:09 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 12:19:09 GMT
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<Xns9BA9703C478C6duncanbooth@127.0.0.1>
	<7xmyd1rupr.fsf@ruckus.brouhaha.com>
Message-ID: <Xns9BA97C4636638duncanbooth@127.0.0.1>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

> Duncan Booth <duncan.booth at invalid.invalid> writes:
>> If you want to write doctests then any stable order in the default
>> dict type would be helpful no matter whether it means that keys are
>> in original insertion or latest insertion order or sorted.
> 
> Just use "sorted" in the test code:
>  >>> print sorted(dict((a**2,a) for a in xrange(5)).keys())
>   [0, 1, 4, 9, 16]
> 

No, that only works if you have control over the dict iteration. There are 
plenty of situations when tests become unstable because dicts are unstable 
and you don't have control over the order of iteration. Also, if you are 
using doctests as a form of documentation then you just want to be able to 
show the value, or at most pprint it, you don't want to obscure the 
documentation with calls to sort.

For example if you have something that creates xml then almost certainly 
the library you are using stores the attributes for a tag in a dictionary 
and just outputs them in whatever order they iterate over. That's fine for 
creating XML but when you want a test like:

>>> mydata.asXml()
<... some xml here except we don't know what order the attributes will 
appear in ...>

then you are stuffed. Actually it's also a problem if you want to store the 
output XML in Subversion. As with my round-trip coding problem you could 
obviously solve it by changing the code to sort the output, but stabilising 
the order of dict iteration would solve the problem for all such cases.

-- 
Duncan Booth http://kupuguy.blogspot.com


From rdmurray at bitdance.com  Thu Feb  5 07:29:46 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 12:29:46 +0000 (UTC)
Subject: string replace for back slash
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
Message-ID: <gmem3q$p8f$1@ger.gmane.org>

"S.Selvam Siva" <s.selvamsiva at gmail.com> wrote:
> I tried to do a string replace as follows,
> 
> >>> s="hi & people"
> >>> s.replace("&","\&")
> 'hi \\& people'
> >>>
> 
> but i was expecting 'hi \& people'.I dont know ,what is something different
> here with escape sequence.

You are running into the difference between the 'repr' of a string (which
is what is printed by default at the python prompt) and the actual
contents of the string.  In the repr the backslash needs to be escaped
by prefixing it with a backslash, just as you would if you wanted to
enter a backslash into a string in your program.  If you print the string,
you'll see there is only one backslash.  Note that you didn't need to
double the backslash in your replacement string only because it wasn't
followed by a character that forms an escape...but the repr of that
string will still have the backslash doubled, and that is really the
way you should write it in your program to begin with for safety's sake.

Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s="hi & people"
>>> replacementstring = "\&"
>>> replacementstring
'\\&'
>>> print replacementstring
\&
>>> x = s.replace("&","\\&")
>>> x
'hi \\& people'
>>> print x
hi \& people



From simon at mullis.co.uk  Thu Feb  5 07:37:54 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 13:37:54 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
Message-ID: <23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>

Hi Chris

2009/2/5 Chris Rebert <clp2 at rebertia.com>
>
> I'd add some print()s in the above loop (and also the 'for f in files'
> loop) to make sure the part of the code you didn't want to share ("do
> stuff with the line") works correctly, and that nothing is improperly
> looping in some unexpected way.

The point is that even with the very, very simple script I posted
above the behavior of open(sys.stdin) and open(filename, 'r') is
different.

The object foo (where foo = sys.stdin) allows me to iterate then hands
back after the loop is finished.

The object bar (where bar = open(filename, 'r')) does not.

Both foo and bar have the same type, methods, repr etc.

> Also, there are several series of lines with invalid indentation;
> could be an email artifact or could be the cause of your problem. If
> the print()s don't yield any useful insight, repost the code again
> with absolutely correct indentation.

(code posted again to fix indents)
#!/usr/bin/env python

import glob, os, sys

class TestParse(object):
    def __init__(self):
        if options.stdin:
            self.scan_data(sys.stdin)
            if options.glob:
                self.files = glob.glob(options.glob)
                for f in files:
                    fh = open(f, 'r')
                    self.scan_data(fh)
                    fh.close()

    def scan_data(self,fileobject):
        i = 0
        for line in fileobject:
            print i
            i += 1
            # do stuff with the line...
            pass
        print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
    p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob")
    p.add_option("--stdin", dest="stdin", action="store_true", default="False")
    (options, args) = p.parse_args()
    main()


(The code I'm actually using is much more complex than this. I tried
to create the most simple example of it _not_ working as expected...)

> Finally, some stylistic points:
> - don't do 'if (foo):'   use the less noisy 'if foo:' instead
> - don't do 'i = int()'   use the more obvious 'i = 0' instead
>
ok.

My question again, to be more explicit: Should the objects created by
sys.stdin and open(filename, 'r') have the same behavior when iterated
over? They both have __iter__ methods....

Thanks in advance for any suggestions

SM


From rdmurray at bitdance.com  Thu Feb  5 07:39:09 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 12:39:09 +0000 (UTC)
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
	<gmej72$heu$1@ger.gmane.org>
Message-ID: <gmemlc$r4s$1@ger.gmane.org>

Quoth Christian Heimes <lists at cheimes.de>:
> thomasvangurp at gmail.com schrieb:
> > I just recently learned python, I'm using it mainly to process huge
> > <5GB txt files of ASCII information about DNA. I've decided to learn
> > 3.0, but maybe I need to step back to 2.6?
> > 
> > I'm getting exceedingly frustrated by the slow file IO behaviour of
> > python 3.0. I know that a bug-report was submitted here:
> > http://bugs.python.org/issue4533. And a solution was posted.
[snip stuff about patching]
> 
> I suggest you stick with Python 2.5 or 2.6. Python 3.0 isn't as mature
> as the 2.x series. It's brand new, lot's of things have changed, too.

3.1 will come out much sooner than a normal "next dot" release python
would, and will contain very significant improvements in the IO speed.
In the meantime, in your case at least, to get real work done you'll
be better off using 2.6.  You can use the 'from __future__ import' to
bring various 3.0 features into 2.6 and make 2.6 look more like 3.0,
and you can use the -3 flag to check your code for 3.0 compatibility, so
that you will be ready to move back to the 3 series when 3.1 comes out.
(Assuming you don't end up needing any 3rd party libraries that haven't
been ported yet by then, that is.)

Unless, of course, you are comfortable with compiling from source
and would like to help _test_ the 3.1 IO library.... :)

--RDM



From andrew at acooke.org  Thu Feb  5 07:50:39 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 5 Feb 2009 04:50:39 -0800 (PST)
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>


so what is happening with pep 372?

http://www.python.org/dev/peps/pep-0372/


From mrkafk at gmail.com  Thu Feb  5 07:54:15 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 13:54:15 +0100
Subject: Arguments for map'ped functions
Message-ID: <gmenhm$vhk$1@ger.gmane.org>

Hello everyone,

So I have this function I want to map onto a list of sequences of 
*several* arguments (while I would want to pass those arguments to each 
function in the normal fashion). I realize this is contrived, maybe an 
example would make this clear:

params = [ ('comp.lang.python', ['rtfm', 'shut']), ('comp.lang.perl', 
['rtfm','shut']) ]

qurls = map(consqurls, params)

def consqurls(args):
     ggroup, gkeywords = args
...

Since the argument passed to map'ped function is a single tuple of 
arguments, I have to unpack them in the function. So the question is how 
to pass several arguments to a map'ped function here?


Code in question:

def fillurlfmt(args):
     urlfmt, ggroup, gkw = args
     return {'group':ggroup, 'keyword':gkw, 'url': urlfmt % (gkw, ggroup)}

def consqurls(args):
     ggroup, gkeywords = args
     urlfmt = 
'http://groups.google.com/groups/search?as_q=%s&as_epq=&as_oq=&as_eq=&num=10&scoring=&lr=&as_sitesearch=&as_qdr=&as_drrb=b&as_mind=1&as_minm=1&as_miny=1999&as_maxd=1&as_maxm=1&as_maxy=2009&as_ugroup=%s&as_usubject=&as_uauthors=&safe=off'
     qurls = map(fillurlfmt, [ (urlfmt, ggroup, gkw) for gkw in gkeywords])
     return qurls

if __name__ == "__main__":
     gkeywords = ['rtfm', 'shut']
     ggroups = ['comp.lang.python', 'comp.lang.perl']
     params = [(ggroup, gkeywords) for ggroup in ggroups]
     qurls = map(consqurls, params)
     print qurls

Regards,
mk



From pythonsky at sky.com  Thu Feb  5 07:55:42 2009
From: pythonsky at sky.com (garywood)
Date: Thu, 5 Feb 2009 12:55:42 -0000
Subject: python 3 error i know the file works  in python 2.6 
Message-ID: <EB7B34C0FE3542D5BFB59133577EF96B@Home>

can someone help me please 


#open file and read last names
filename = input('name file')
file = open(filename, 'r')
names_list = file.readlines()
file.close()
#open a file for saving passwords
outfile_name = input('Save passwords')
outfile = open(outfile_name, 'a')


#create a password for each name in list
import random, string
name = ('')
for name in names_list:
    name_prefix = name[0:2]
    number = random.randrange(100,999)
    name_prefix = str.upper(name_prefix)
    password = name_prefix + str(number)
    whole_line = (password)
    print (password)
    outfile_name.write(whole_line)
    outfile_name.close()
    
    print (password)

error
Traceback (most recent call last):
  File "C:\Documents and Settings\Gary\Desktop\python\bembry\pa2.i.py", line 21, in <module>
    outfile_name.write(whole_line)
AttributeError: 'str' object has no attribute 'write'
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From simon at mullis.co.uk  Thu Feb  5 08:09:17 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 14:09:17 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
	<23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
Message-ID: <23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>

Last try at getting the indenting to appear correctly..

#!/usr/bin/env python

import glob, os, sys

class TestParse(object):
    def __init__(self):
        if options.stdin:
            self.scan_data(sys.stdin)
        if options.glob:
            self.files = glob.glob(options.glob)
            for f in files:
                fh = open(f, 'r')
                self.scan_data(fh)
                fh.close()

    def scan_data(self,fileobject):
        i = 0
        for line in fileobject:
            print i
            i += 1
            # do stuff with the line...
            pass
        print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
    p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob", help="""use this glob""")
    p.add_option("--stdin", dest="stdin", action="store_true",
default="False", help="""use stdin""")
    (options, args) = p.parse_args()
    main()


From __peter__ at web.de  Thu Feb  5 08:09:29 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 05 Feb 2009 14:09:29 +0100
Subject: Arguments for map'ped functions
References: <mailman.8870.1233838467.3487.python-list@python.org>
Message-ID: <gmeoe8$673$01$1@news.t-online.com>

mk wrote:

> So I have this function I want to map onto a list of sequences of
> *several* arguments (while I would want to pass those arguments to each
> function in the normal fashion). I realize this is contrived, maybe an

You can either use a list comprehension

[f(*args) for args in seq]

or starmap()

list(itertools.starmap(f, seq))

Peter


From mrkafk at gmail.com  Thu Feb  5 08:17:34 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 14:17:34 +0100
Subject: Flattening lists
Message-ID: <gmeotf$4j6$1@ger.gmane.org>

Hello everybody,

Any better solution than this?

def flatten(x):
     res = []
     for el in x:
         if isinstance(el,list):
             res.extend(flatten(el))
         else:
             res.append(el)
     return res

a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
print flatten(a)


[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Regards,
mk



From simon at mullis.co.uk  Thu Feb  5 08:18:19 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 14:18:19 +0100
Subject: [SOLVED] Re: Should "open(sys.stdin)" and "open(file, 'r')" be 
	equivalent?
In-Reply-To: <23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
	<23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
	<23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>
Message-ID: <23d7e1bb0902050518h2e8752c9of1f90596accaa6f5@mail.gmail.com>

Forget it all... I was being very very daft!

The "default = 'False'" in the options for stdin was not being
evaluated as I thought, so the script was waiting for stdin even when
there was the glob switch was used...No stdin equals the script
seeming to "hang".

Ah well.

SM


From lists at cheimes.de  Thu Feb  5 08:18:28 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 14:18:28 +0100
Subject: Ordered dict by default
In-Reply-To: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
Message-ID: <gmeov4$477$1@ger.gmane.org>

andrew cooke schrieb:
> so what is happening with pep 372?
> 
> http://www.python.org/dev/peps/pep-0372/

It's still a draft and hasn't been implemented yet. Now is the time to
get it ready for Python 3.1 and 2.7.

Christian



From andreas.tawn at ubisoft.com  Thu Feb  5 08:22:04 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Thu, 5 Feb 2009 14:22:04 +0100
Subject: python 3 error i know the file works  in python 2.6
In-Reply-To: <EB7B34C0FE3542D5BFB59133577EF96B@Home>
References: <EB7B34C0FE3542D5BFB59133577EF96B@Home>
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758005B55074@PDC-MAIL3.ubisoft.org>

>#open file and read last names
>filename = input('name file')
>file = open(filename, 'r')
>names_list = file.readlines()
>file.close()
>#open a file for saving passwords
>outfile_name = input('Save passwords')
>outfile = open(outfile_name, 'a')
>
>
>#create a password for each name in list
>import random, string
>name = ('')
>for name in names_list:
>    name_prefix = name[0:2]
>    number = random.randrange(100,999)
>    name_prefix = str.upper(name_prefix)
>    password = name_prefix + str(number)
>    whole_line = (password)
>    print (password)
>    outfile_name.write(whole_line)
>    outfile_name.close()
>    
>    print (password)
> 
>error
>Traceback (most recent call last):
>  File "C:\Documents and Settings\Gary\Desktop\python\bembry\pa2.i.py",
line 21, in <module>
>    outfile_name.write(whole_line)
>AttributeError: 'str' object has no attribute 'write'

You're trying to output to the output filename string rather that the
output file you opened with that filename.

Cheers,

Drea


From BrianVanderburg2 at aim.com  Thu Feb  5 08:22:38 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 08:22:38 -0500
Subject: Flattening lists
In-Reply-To: <gmeotf$4j6$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>
Message-ID: <498AE81E.6020100@aim.com>

mrkafk at gmail.com wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk
>
> -- 
> http://mail.python.org/mailman/listinfo/python-list

I think it may be just a 'little' more efficient to do this:

def flatten(x, res=None):
    if res is None:
       res = []

    for el in x:
       if isinstance(el, (tuple, list)):
          flatten(el, res)
       else:
          res.append(el)

    return res

Brian Vanderburg II


From mrkafk at gmail.com  Thu Feb  5 08:44:09 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 14:44:09 +0100
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <gmeqf9$a0c$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:
>> def flatten(x):
>>     res = []
>>     for el in x:
>>         if isinstance(el,list):
>>             res.extend(flatten(el))
>>         else:
>>             res.append(el)
>>     return res

> 
> I think it may be just a 'little' more efficient to do this:
> 
> def flatten(x, res=None):
>    if res is None:
>       res = []
> 
>    for el in x:
>       if isinstance(el, (tuple, list)):
>          flatten(el, res)
>       else:
>          res.append(el)
> 
>    return res


Hmm why should it be more efficient? extend operation should not be very 
costly?

Regards,
mk



From s.selvamsiva at gmail.com  Thu Feb  5 08:48:11 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Thu, 5 Feb 2009 19:18:11 +0530
Subject: string replace for back slash
In-Reply-To: <gmem3q$p8f$1@ger.gmane.org>
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
	<gmem3q$p8f$1@ger.gmane.org>
Message-ID: <b423b9550902050548u2567f700ocfdcf3bd1a4e078f@mail.gmail.com>

On Thu, Feb 5, 2009 at 5:59 PM, <rdmurray at bitdance.com> wrote:

> "S.Selvam Siva" <s.selvamsiva at gmail.com> wrote:
> > I tried to do a string replace as follows,
> >
> > >>> s="hi & people"
> > >>> s.replace("&","\&")
> > 'hi \\& people'
> > >>>
> >
> > but i was expecting 'hi \& people'.I dont know ,what is something
> different
> > here with escape sequence.
>
> You are running into the difference between the 'repr' of a string (which
> is what is printed by default at the python prompt) and the actual
> contents of the string.  In the repr the backslash needs to be escaped
> by prefixing it with a backslash, just as you would if you wanted to
> enter a backslash into a string in your program.  If you print the string,
> you'll see there is only one backslash.  Note that you didn't need to
> double the backslash in your replacement string only because it wasn't
> followed by a character that forms an escape...but the repr of that
> string will still have the backslash doubled, and that is really the
> way you should write it in your program to begin with for safety's sake.
>
> Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> s="hi & people"
> >>> replacementstring = "\&"
> >>> replacementstring
> '\\&'
> >>> print replacementstring
> \&
> >>> x = s.replace("&","\\&")
> >>> x
> 'hi \\& people'
> >>> print x
> hi \& people
>
> --
> http://mail.python.org/mailman/listinfo/python-list



Thank you all for your response,

Now i understood the way python terminal expose '\'.



-- 
Yours,
S.Selvam
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From youri_lammers_88 at hotmail.com  Thu Feb  5 09:00:21 2009
From: youri_lammers_88 at hotmail.com (Youri Lammers)
Date: Thu, 5 Feb 2009 15:00:21 +0100
Subject: os.system issues
Message-ID: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>


Ok,
 
I want to run a program called 'muscle' with my python script,
muscle uses the following command:
'muscle.exe -in filename -out filename'
so far I got:
 
import os
args = ['-in filename', '-out filename']
os.system('E:\Programs\muscle\muscle.exe args')
 
However, when I run this nothing happends, no error message, nothing.
 
So what am I doing wrong here?
 
Youri
_________________________________________________________________
De leukste online filmpjes vind je op MSN Video!
http://video.msn.com/video.aspx?mkt=nl-nl
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From kyosohma at gmail.com  Thu Feb  5 09:07:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 5 Feb 2009 06:07:21 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
	<5ef6e64b-1468-4ee2-8261-3ba027ca5370@p2g2000prf.googlegroups.com>
Message-ID: <1cec1f1f-296c-4df6-abc3-447b5790ce41@p2g2000prn.googlegroups.com>

On Feb 4, 5:49?pm, andrew cooke <and... at acooke.org> wrote:
> On Feb 4, 8:06?pm, len <lsumn... at gmail.com> wrote:
>
> > How does one find the methods that are available in the classes.
>
> heh. ?welcome to the wonderful world of wxpython :o(
>
> if you use eclipse to edit your code, then (providing the wind is in
> the right direction and the file you are editing doesn't have any
> syntax errors) pressing F3 when you are on a particular method will
> take you to the definition. ?or, at least, one of the definitions with
> that name.
>
> and if you want to see a list of available methods the simplest way is
> to use tab completion (or dir() in python itself).
>
> if you're not using eclipse (with pydev) check to see if the ide/
> editor you are using has something similar.
>
> also, wxpython comes with some examples, all packaged in a demo
> program. ?that is your best source of documentation. ?go through all
> the examples in there and look at the code (the demo program will show
> you the code and even let you edit it and see the results of your
> changes).
>
> to be honest, wxpython is a bit of a nightmare (imho). but the results
> can be worth it.
>
> good luck,
> andrew

I don't think the docs are any worse than any other complicated third
party package. Reportlab comes to mind...and the wxPython list members
are very helpful.

Mike


From lists at cheimes.de  Thu Feb  5 09:08:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 15:08:14 +0100
Subject: os.system issues
In-Reply-To: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <gmerse$e7j$1@ger.gmane.org>

Youri Lammers schrieb:
> Ok,
>  
> I want to run a program called 'muscle' with my python script,
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
>  
> import os
> args = ['-in filename', '-out filename']
> os.system('E:\Programs\muscle\muscle.exe args')
>  
> However, when I run this nothing happends, no error message, nothing.
>  
> So what am I doing wrong here?

For starters you should use the subprocess module instead of os.system.
Next you have either write "E:\\..." or r"E:\..." (note the trailing 'r').

Try this:

import subprocess
subprocess.check_call(['E:\\Programs\\muscle\\muscle.exe', '-in',
'filename', '-out', 'filename'])

Christian



From kyosohma at gmail.com  Thu Feb  5 09:08:50 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 5 Feb 2009 06:08:50 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <e91f2003-7ef0-4be2-9f68-ae432e990dee@35g2000pry.googlegroups.com>

On Feb 4, 5:06?pm, len <lsumn... at gmail.com> wrote:
> Hi
>
> I am going through the "wxPython in Action" book by Noel Rappin and
> Robin Dunn.
>
> I have been typing in the example programs as I go and play with
> modifing the code.
> Thought I should start trying to find my way around the documentation
> found on the wxPython web site.
>
> The problem I have been having is I can't find the methods or more
> specifically
>
> 'SetBackgroundColour' or 'AddSimpleTool' for example.
>
> How does one find the methods that are available in the classes.
>
> I tried looking at the wxWidgets web site and still had the same
> problem.
>
> Could someone give me a little direction in this?
>
> Thanks
> Len

In addition to what the others have said, there's also an alternate
doc location done up by one guy who seems to have a lot of free time:

http://xoomer.virgilio.it/infinity77/wxPython/index.html

The wiki is also helpful:

http://wiki.wxpython.org/

But I concur that the mailing list is definitely THE place to be to
learn the most once you've gotten comfortable with the toolkit.

Mike


From sgeiger at councilforeconed.org  Thu Feb  5 09:10:06 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Thu, 05 Feb 2009 09:10:06 -0500
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <498AF33E.4080907@councilforeconed.org>

These functions come from goopy:


def flatten1(seq):
  """
  Return a list with the contents of SEQ with sub-lists and tuples 
"exploded".
  This is only done one-level deep.
  """

  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      for val in x:
        lst.append(val)
    else:
      lst.append(x)
  return lst

def flatten(seq):
  """
  Returns a list of the contents of seq with sublists and tuples "exploded".
  The resulting list does not contain any sequences, and all inner sequences
  are exploded.  For example:

  >>> flatten([7,(6,[5,4],3),2,1])
  [7,6,5,4,3,2,1]
  """
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten(el))
    else:
      lst.append(el)
  return lst




Brian Allen Vanderburg II wrote:
> mrkafk at gmail.com wrote:
>> Hello everybody,
>>
>> Any better solution than this?
>>
>> def flatten(x):
>>     res = []
>>     for el in x:
>>         if isinstance(el,list):
>>             res.extend(flatten(el))
>>         else:
>>             res.append(el)
>>     return res
>>
>> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
>> print flatten(a)
>>
>>
>> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>
>> Regards,
>> mk
>>
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>
> I think it may be just a 'little' more efficient to do this:
>
> def flatten(x, res=None):
>    if res is None:
>       res = []
>
>    for el in x:
>       if isinstance(el, (tuple, list)):
>          flatten(el, res)
>       else:
>          res.append(el)
>
>    return res
>
> Brian Vanderburg II
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From rdmurray at bitdance.com  Thu Feb  5 09:14:55 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 14:14:55 +0000 (UTC)
Subject: os.system issues
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <gmes8v$fo5$1@ger.gmane.org>

Youri Lammers <youri_lammers_88 at hotmail.com> writes:
> I want to run a program called 'muscle' with my python script=2C
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
> 
> import os
> args = ['-in filename', '-out filename']
> os.system('E:\Programs\muscle\muscle.exe args')
> 
> However when I run this nothing happends no error message nothing.
> 
> So what am I doing wrong here?

You are calling the program muscle with the argument 'args'.

If you want to put your arguments into the system call, you will
want to write it like this:

os.system('E:\Programs\muscle\muscle.exe -in filename -out filename')

If you need to substitute args into the string passed to
os.system, then take a look at python string handling in the
tutorial.

You also will probably want to look at the 'subprocess' module
at some point, which is more flexible than os.system.

--RDM



From mrkafk at gmail.com  Thu Feb  5 09:17:19 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 15:17:19 +0100
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <gmesde$g8t$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:
 >> def flatten(x):
 >>     res = []
 >>     for el in x:
 >>         if isinstance(el,list):
 >>             res.extend(flatten(el))
 >>         else:
 >>             res.append(el)
 >>     return res

 >
 > I think it may be just a 'little' more efficient to do this:
 >
 > def flatten(x, res=None):
 >    if res is None:
 >       res = []
 >
 >    for el in x:
 >       if isinstance(el, (tuple, list)):
 >          flatten(el, res)
 >       else:
 >          res.append(el)
 >
 >    return res


Hmm why should it be more efficient? extend operation should not be very
costly?

Regards,
mk



From netzhen at gmail.com  Thu Feb  5 09:36:37 2009
From: netzhen at gmail.com (Baolong zhen)
Date: Thu, 5 Feb 2009 22:36:37 +0800
Subject: Flattening lists
In-Reply-To: <gmesde$g8t$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
Message-ID: <a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>

less list creation.

On Thu, Feb 5, 2009 at 10:17 PM, mk <mrkafk at gmail.com> wrote:

> Brian Allen Vanderburg II wrote:
> >> def flatten(x):
> >>     res = []
> >>     for el in x:
> >>         if isinstance(el,list):
> >>             res.extend(flatten(el))
> >>         else:
> >>             res.append(el)
> >>     return res
>
> >
> > I think it may be just a 'little' more efficient to do this:
> >
> > def flatten(x, res=None):
> >    if res is None:
> >       res = []
> >
> >    for el in x:
> >       if isinstance(el, (tuple, list)):
> >          flatten(el, res)
> >       else:
> >          res.append(el)
> >
> >    return res
>
>
> Hmm why should it be more efficient? extend operation should not be very
> costly?
>
>
> Regards,
> mk
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From invalid at invalid  Thu Feb  5 10:16:10 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 05 Feb 2009 09:16:10 -0600
Subject: os.system issues
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
	<mailman.8882.1233843753.3487.python-list@python.org>
Message-ID: <Gt6dnTFsk8knnxbUnZ2dnUVZ_sjinZ2d@posted.visi>

On 2009-02-05, Christian Heimes <lists at cheimes.de> wrote:
> Youri Lammers schrieb:
>> Ok,
>>  
>> I want to run a program called 'muscle' with my python script,
>> muscle uses the following command:
>> 'muscle.exe -in filename -out filename'
>> so far I got:
>>  
>> import os
>> args = ['-in filename', '-out filename']
>> os.system('E:\Programs\muscle\muscle.exe args')
>>  
>> However, when I run this nothing happends, no error message, nothing.
>>  
>> So what am I doing wrong here?
>
> For starters you should use the subprocess module instead of os.system.
> Next you have either write "E:\\..." or r"E:\..." (note the trailing 'r').

Leading 'r'.

Or just skip cmd.exe and use forward slashes like god intended.

-- 
Grant Edwards                   grante             Yow! I'd like MY data-base
                                  at               JULIENNED and stir-fried!
                               visi.com            


From ljjediknight at gmail.com  Thu Feb  5 10:20:55 2009
From: ljjediknight at gmail.com (Luke)
Date: Thu, 5 Feb 2009 07:20:55 -0800 (PST)
Subject: Tkinter
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
	<gcidnWzqds6EcxTUnZ2dnUVZ_oOdnZ2d@pdx.net>
Message-ID: <92bb5b5e-bd93-4bc1-97a0-9d36be5f3a6b@t26g2000prh.googlegroups.com>

Thanks, Its working smoothly now


From dickinsm at gmail.com  Thu Feb  5 10:21:22 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 07:21:22 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>

On Feb 5, 1:17?pm, mk <mrk... at gmail.com> wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):

Just out of interest, how often do people really need
such a recursive flatten, as opposed to a single-level
version?

I often find myself needing a 'concat' method that
turns a list of lists (or iterable of iterables) into
a single list;  itertools.chain does this quite nicely.
But I don't think I've ever encountered a need for the
full recursive version.

Mark



From durumdara at gmail.com  Thu Feb  5 10:21:29 2009
From: durumdara at gmail.com (durumdara)
Date: Thu, 05 Feb 2009 16:21:29 +0100
Subject: Cheetah and hungarian charset...
Message-ID: <498B03F9.3040109@gmail.com>

Hi!

I wanna ask that have anyone some exp. with Cheetah and the non-ascii chars?

I have a site. The html template documents are saved in ansi format, psp 
liked them.
But the cheetah parser makes ParseError on hungarian characters, like 
"?", "?", "?", etc. When I remove them, I got good result, but I don't 
want to remove them all...

I cannot parse them. Please help me, how to force cheetah to eat them all?

Thanks for your help:
     dd



From james at agentultra.com  Thu Feb  5 10:22:20 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 05 Feb 2009 15:22:20 +0000
Subject: [Web 2.0] Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
	<498a1dc7$0$10675$426a74cc@news.free.fr>
Message-ID: <877i44c3ir.fsf@agentultra.com>

Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr> writes:

> Gilles Ganault a ?crit :
>> Hello
>>
>> If I wanted to build some social web site such as Facebook, what do
>> frameworks like Django or TurboGears provide over writing a site from
>> scratch using Python?
>
> Quite a lot of abstractions and factorisation of the boilerplate code,
> a known way to organize your application, and possibly a good
> integration of the usual components (and wrt/ Django, a customizable
> yet fairly usable OOTB admin interface). For simple to mediumly
> complex applications, this can mean more than 80% of the grunt
> work. The counterpart is mostly learning and understanding the
> framework, which means you may not save that much time on a first
> project - but it can really pay off then. One of my coworker started
> this morning a (really simple...) project which acceptance tests are
> to begin on monday, and we are all quite confident he'll deliver on
> time, thanks to Django.

Well the big negative is when you application design starts expanding
past the framework design. A percolator makes a decent cup of coffee but
it really isn't meant for making fancy lattes. This is where the 90/10
rule will catch you if you're not careful.

"90% of the effort will be spent on the last 10% of the work."


From jason-sage at creativetrax.com  Thu Feb  5 10:22:29 2009
From: jason-sage at creativetrax.com (jason-sage at creativetrax.com)
Date: Thu, 05 Feb 2009 09:22:29 -0600
Subject: Flattening lists
In-Reply-To: <gmeotf$4j6$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>
Message-ID: <498B0435.9020104@creativetrax.com>

mk wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)

It depends on what you mean by "better".  More features?  Here is the 
function from Sage (http://www.sagemath.org), which is a modified 
version of a more standard implementation to give a max_level argument.

The first few lines of documentation:

def flatten(in_list, ltypes=(list, tuple), max_level=sys.maxint):
   """
   Flattens a nested list.

   INPUT:
       in_list -- a list or tuple
       ltypes -- optional list of particular types to flatten
       max_level -- the maximum level to flatten

   OUTPUT:
       a flat list of the entries of in_list

(lots of examples follow this documentation)

The implementation:  
http://www.sagemath.org/hg/sage-main/file/b0aa7ef45b3c/sage/misc/flatten.py


Jason



From mrkafk at gmail.com  Thu Feb  5 10:24:53 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 16:24:53 +0100
Subject: Flattening lists
In-Reply-To: <a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
References: <gmeotf$4j6$1@ger.gmane.org>
	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
Message-ID: <gmf0c4$eq$1@ger.gmane.org>

Baolong zhen wrote:
> less list creation.

At the cost of doing this at each 'flatten' call:

if res is None:
    res = []

The number of situations of executing above code is the same as the 
number of list creations (once for each 'flatten' call, obviously).

Is list creation really more costly than above?

Regards,
mk



From google at mrabarnett.plus.com  Thu Feb  5 10:29:20 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 15:29:20 +0000
Subject: time: Daylight savings confusion
In-Reply-To: <498AB3E3.1060804@mattnordhoff.com>
References: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
	<498AB3E3.1060804@mattnordhoff.com>
Message-ID: <498B05D0.8060706@mrabarnett.plus.com>

Matt Nordhoff wrote:
> Tim H wrote:
>> On Win XP 64bit, Python 2.6.1 64bit
>> 
>> I am trying to rename files by their creation time.
>> 
>> It seems the time module is too smart for its own good here.
>> 
>> time.localtime(os.path.getctime(f)) returns a value one hour off
>> from what windows reports for files that were created when Daylight
>> savings time was in effect (ie when the tm_isdst field is one).  I
>> can kludge it, but am I missing the "right" way to do it?
>> 
>> Tim
>> 
>> full code:
> 
> <snip full code>
> 
>> From what I remember, this is a bug in the Win32 API. Python
>> probably could hack around it, but, well, I guess it doesn't.
> 
> Googling a bit, Perl's Win32::UTCFileTime module [1] provides 
> workarounds (not for Python, of course, but it could probably be
> ported) and explains all the gory details (which I have not read, so
> maybe I misunderstand ;-).
> 
> [1] 
> <http://search.cpan.org/~shay/Win32-UTCFileTime-1.50/lib/Win32/UTCFileTime.pm>
>  <http://xrl.us/beezsv>

Windows does apply the current value of DST when converting from UTC to 
local time.

The problem is that the rules for when DST starts and ends might change 
over time and from place to place, and local time depends on the
timezone too.

Probably the best you can do is just to apply the current rules and 
accept that the result might not match what the local time actually was.


From michele.simionato at gmail.com  Thu Feb  5 10:33:30 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 5 Feb 2009 07:33:30 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>

On Feb 5, 2:17?pm, mk <mrk... at gmail.com> wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
> ? ? ?res = []
> ? ? ?for el in x:
> ? ? ? ? ?if isinstance(el,list):
> ? ? ? ? ? ? ?res.extend(flatten(el))
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?res.append(el)
> ? ? ?return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk

Looks fine to me. In some situations you may also use hasattr(el,
'__iter__') instead of isinstance(el, list) (it depends if you want to
flatten generic iterables or only lists).


From google at mrabarnett.plus.com  Thu Feb  5 10:36:14 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 15:36:14 +0000
Subject: Using while loop and if statement to tell if a binary has an
	odd 	or even number of 1's.
In-Reply-To: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
References: mailman.8817.1233796709.3487.python-list@python.org
	<6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
Message-ID: <498B076E.5050006@mrabarnett.plus.com>

Mark Dickinson wrote:
> On Feb 5, 1:18 am, Chris Rebert <c... at rebertia.com> wrote:
>> For an integer:
>> is_even = bin(the_int)[2:].count('1') % 2 == 0
> 
> But the OP has to use if and while.  How about:
> 
> while 2+2 != 5:
>     if 'wkw' in 'just being awkward':
>         is_even = bin(the_int)[2:].count('1') % 2 == 0
>         break
> 
> or (Python 2.5 compatible):
> 
> def count_set_bits(n):
>     # make sure we include an if, to
>     # satisfy OP's requirements:
>     if n < 0:
>         raise ValueError
>     count = 0
>     while n:
>         count += 1
>         n &= n-1
>     return count
> 
> is_even = count_set_bits(the_int) % 2 == 0
> 
> ...but anyone submitting this as a homework
> solution had better be prepared to explain why
> it works.
> 
I haven't seen that algorithm before. Very clever! :-)


From deets at nospam.web.de  Thu Feb  5 10:36:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 16:36:30 +0100
Subject: Cheetah and hungarian charset...
In-Reply-To: <mailman.8887.1233847304.3487.python-list@python.org>
References: <mailman.8887.1233847304.3487.python-list@python.org>
Message-ID: <6v0fbuFho2e8U1@mid.uni-berlin.de>

durumdara schrieb:
> Hi!
> 
> I wanna ask that have anyone some exp. with Cheetah and the non-ascii 
> chars?
> 
> I have a site. The html template documents are saved in ansi format, psp 
> liked them.
> But the cheetah parser makes ParseError on hungarian characters, like 
> "?", "?", "?", etc. When I remove them, I got good result, but I don't 
> want to remove them all...
> 
> I cannot parse them. Please help me, how to force cheetah to eat them all?

Please provide tracebacks and code and data examples.

Diez


From Scott.Daniels at Acm.Org  Thu Feb  5 10:54:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 05 Feb 2009 07:54:40 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <mailman.8865.1233835298.3487.python-list@python.org>
References: <498AAC89.5080002@berkeley.edu>
	<mailman.8865.1233835298.3487.python-list@python.org>
Message-ID: <5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>

M.-A. Lemburg wrote:
> On 2009-02-05 10:08, Nick Matzke wrote:
>> ..., I can run this in the ipython shell just fine:
>> a = ["12", "15", "16", "38.2"]
>> dim = int(sqrt(size(a)))
>> ...But if I move these commands to a function in another file, it freaks out:
> You need to add:
> 
> from math import sqrt
or:
     from cmath import sqrt
or:
     from numpy import sqrt

Each with their own, slightly different, meaning.
Hence the reason many of us prefer to import the module
and reference the function as a module attribute.

Note that _many_ (especially older) package documents describe
their code without the module name.  I believe that such behavior
is because, when working to produce prose about a package, it
feels too much like useless redundancy when describing each function
or class as "package.name".


--Scott David Daniels
Scott.Daniels at Acm.Org


From mrkafk at gmail.com  Thu Feb  5 11:00:05 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:00:05 +0100
Subject: Is c.l.py becoming less friendly?
Message-ID: <gmf2e5$9b3$1@ger.gmane.org>


(duck)

542 comp.lang.python rtfm

467 comp.lang.python shut+up

263 comp.lang.perl rtfm

45 comp.lang.perl shut+up




Code:

import urllib2
import re
import time

def fillurlfmt(args):
     urlfmt, ggroup, gkw = args
     return {'group':ggroup, 'keyword':gkw, 'url': urlfmt % (gkw, ggroup)}

def consqurls(args):
     ggroup, gkeywords = args
     urlfmt = 
'http://groups.google.com/groups/search?as_q=%s&as_epq=&as_oq=&as_eq=&num=10&scoring=&lr=&as_sitesearch=&as_drrb=q&as_qdr=&as_mind=1&as_minm=1&as_miny=1999&as_maxd=1&as_maxm=1&as_maxy=2009&as_ugroup=%s&as_usubject=&as_uauthors=&safe=off'
     qurls = map(fillurlfmt, [ (urlfmt, ggroup, gkw) for gkw in gkeywords ])
     return qurls

def flatten_list(x):
     res = []
     for el in x:
         if isinstance(el,list):
             res.extend(flatten_list(el))
         else:
             res.append(el)
     return res

def ggsearch(urldict):
     opener = urllib2.build_opener()
     opener.addheaders = [('User-agent', 'Mozilla/5.0 (Windows; U; 
Windows NT 5.1; en-US; rv:1.8.1.20) Gecko/20081217 (CK-IBM) 
Firefox/2.0.0.20')]
     time.sleep(0.1)
     urlf = opener.open(urldict['url'])
     resdict = {'result': urlf.read()}
     resdict.update(urldict)
     urlf.close()
     return resdict

def extrclosure(resregexp, groupno):
     def extrres(resdict):
         txtgr = resregexp.search(resdict['result'])
         resdict['result']=txtgr.group(groupno)
         return resdict
     return extrres

def delcomma(x):
     x['result'] = x['result'].replace(',','')
     return x

if __name__ == "__main__":
     gkeywords = ['rtfm', 'shut+up']
     ggroups = ['comp.lang.python', 'comp.lang.perl']
     params = [(ggroup, gkeywords) for ggroup in ggroups]
     qurls = map(consqurls, params)
     qurls = flatten_list(qurls)
     gresults = map(ggsearch, qurls)
     resre = re.compile('Results \<b\>1\</b\> - \<b\>.+?\</b\> of about 
\<b\>(.+?)\</b\>')
     gextrsearchresult = extrclosure(resre,1)
     gresults = map(gextrsearchresult, gresults)
     gresults = map(delcomma, gresults)
     for el in gresults:
         print el['result'], el['group'], el['keyword']
         print


This was inspired by 
http://mail.python.org/pipermail/python-list/2002-November/172466.html

Regards,
mk



From apt.shansen at gmail.com  Thu Feb  5 11:01:35 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:01:35 -0800
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>

> That page about Ruby dicts show a higher traversal speed (probably
> just because the CPU has to scan less memory, but I am not sure,
> because mordern CPUs are very complex) but lower insertion speed (I
> think mostly not because the added management of two pointers, but
> because the memory used increases, so there are more cache misses. If
> this turns out as true, then using the xor trick may halve the extra
> memory needed). I have no idea if such different balance of
> performance will lead to on average faster or slower Python programs,
> this has to be tested. But even if the average performance becomes a
> little worse I think making the default Python dict as ordered is a
> positive change for Python too, because built-ins are meant to be as
> flexible as possible, even if they aren't the fastest ones or the less
> memory hungry ones (and keeping dicts ordered decreases the surprises
> a newbie finds, makes some code cleaner, and doctests become simpler
> to write because the order of items may be more defined).

Er, doing a cursory review of my code has an overwhelmingly higher incidence
of insertions then traversals with my dictionaries: many dictionaries are
never traversed and when they are it is only once, and often had tens to
thousands of insertions before that traversal happens.

So a slight decrease in insertion speed at the cost of faster traversal seems
like a complete loss to me.

Now, I also do recognize the utility of ordered dictionaries in some cases, but
exactly what you mean by ordered varies. I have two cases where "ordered"
has the keys are in a specific custom order. I have four cases where "ordered"
means maintaining insertion order. For the former I do sorted(dict) on access
when I need to do something order-related. For the latter I have a simple
ordered dictionary implementation that maintains the keys as a separate list
attached to the dictionary.

But interestingly enough to me, in all the cases where I use an ordered dict
in my code, performance is completely irrelevant. Its tens to hundreds of
items usually, and the best optimization in the world wouldn't add more then
an imperceptible fraction of a second, and the memory lost to the extra
list adds up to nothing relevant.

I'm not claiming my use cases are everyones, not by any means. But: this
seems like a complete lose-lose for an idea from my perspective. Sure you
say an unordered dictionary could then be added for my needs, but... I like
my syntactic sugar, thank you :)

Ordered dictionaries can be useful, its good to see a standard implementation
going into the core, but the default? I hope not!

--Stephen


From upton at virginia.edu  Thu Feb  5 11:02:55 2009
From: upton at virginia.edu (Dan Upton)
Date: Thu, 5 Feb 2009 11:02:55 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <5504f9ac0902050802t5c78ed43we0ef16001b371521@mail.gmail.com>

On Thu, Feb 5, 2009 at 11:00 AM, mk <mrkafk at gmail.com> wrote:
>
> (duck)
>
> 542 comp.lang.python rtfm
>
> 467 comp.lang.python shut+up
>
> 263 comp.lang.perl rtfm
>
> 45 comp.lang.perl shut+up
>
But over how many messages for each group?  Wouldn't the percentage of
messages containing those be more interesting than the raw number? ;p


From apt.shansen at gmail.com  Thu Feb  5 11:05:19 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:05:19 -0800
Subject: Ordered dict by default
In-Reply-To: <7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
Message-ID: <7a9c25c20902050805l7d999cb4p74b6b11ef309ab41@mail.gmail.com>

> Now, I also do recognize the utility of ordered dictionaries in some cases, but
> exactly what you mean by ordered varies. I have two cases where "ordered"
> has the keys are in a specific custom order. I have four cases where "ordered"
> means maintaining insertion order. For the former I do sorted(dict) on access
> when I need to do something order-related. For the latter I have a simple
> ordered dictionary implementation that maintains the keys as a separate list
> attached to the dictionary.

Ooh, as an addendum... I found one case where I want insertion-and-update
order: meaning that its an ordered dictionary that maintains insertion
order, but
an update to a particular item moves that item to the back so an update behaves
like del d[key]; d[key] = value in terms of the key order.

"Ordered Dictionaries" are a bit fuzzy. :)

--S


From mrkafk at gmail.com  Thu Feb  5 11:06:28 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:06:28 +0100
Subject: Flattening lists
In-Reply-To: <0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>
Message-ID: <gmf2q3$b47$1@ger.gmane.org>

Mark Dickinson wrote:
> I often find myself needing a 'concat' method that
> turns a list of lists (or iterable of iterables) into
> a single list;  itertools.chain does this quite nicely.
> But I don't think I've ever encountered a need for the
> full recursive version.


You're most probably right in this; however, my main goal here was 
finding 'more Pythonic' way of doing this and learning this way rather 
than the practical purpose of flattening deeply nested lists.

Regards,
mk



From marduk at letterboxes.org  Thu Feb  5 11:06:40 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 05 Feb 2009 11:06:40 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <1233850000.12935.4.camel@localhost.localdomain>

Probably that [c.l.]python is becoming more popular and, like most
things as they become popular, it loses its "purity"... much like the
Internet in the early 1990s.





From mrkafk at gmail.com  Thu Feb  5 11:07:10 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:07:10 +0100
Subject: Flattening lists
In-Reply-To: <a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
Message-ID: <gmf2rd$b47$2@ger.gmane.org>

Michele Simionato wrote:

> Looks fine to me. In some situations you may also use hasattr(el,
> '__iter__') instead of isinstance(el, list) (it depends if you want to
> flatten generic iterables or only lists).

Thanks! Such stuff is what I'm looking for.

Regards,
mk



From BrianVanderburg2 at aim.com  Thu Feb  5 11:10:51 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 11:10:51 -0500
Subject: Flattening lists
In-Reply-To: <gmf0c4$eq$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf0c4$eq$1@ger.gmane.org>
Message-ID: <498B0F8B.8090109@aim.com>

mrkafk at gmail.com wrote:
> Baolong zhen wrote:
>> less list creation.
>
> At the cost of doing this at each 'flatten' call:
>
> if res is None:
>    res = []
>
> The number of situations of executing above code is the same as the 
> number of list creations (once for each 'flatten' call, obviously).
>
> Is list creation really more costly than above?
>
Probably not.  I wrote a small test program using a list several levels 
deep, each list containing 5 sublists at each level and finally just a 
list of numbers.  Flattening 1000 times took about 3.9 seconds for the 
one creating a list at each level, and 3.2 for the one not creating the 
list at each level.

Brian Vanderburg II


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 11:11:58 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 17:11:58 +0100
Subject: Couple of noobish question
In-Reply-To: <mailman.8811.1233792865.3487.python-list@python.org>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
Message-ID: <498b0fb8$0$23714$426a74cc@news.free.fr>

Tim Rowe a ?crit :
> 2009/2/4 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr>:
> 
>> # somemodule.py
>>
>> import os
>>
>> if os.uname()[0] == "Linux":
> 
> On an MS Windows system, os.uname()[0] raises an AttributeError

Thanks for the correction - as you may have guessed, I have not used 
windows for years !-)


From digitig at gmail.com  Thu Feb  5 11:14:32 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 16:14:32 +0000
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <aee48b3c0902050814m3f5d27ecg1282784be977c05c@mail.gmail.com>

2009/2/5 mk <mrkafk at gmail.com>:
>
> (duck)
>
> 542 comp.lang.python rtfm
>
> 467 comp.lang.python shut+up
>
> 263 comp.lang.perl rtfm
>
> 45 comp.lang.perl shut+up

Yes, but is there any real traffic on comp.lang.perl nowadays?

Sorry, cheap shot ;-)

-- 
Tim Rowe


From google at mrabarnett.plus.com  Thu Feb  5 11:20:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 16:20:46 +0000
Subject: Ordered dict by default
In-Reply-To: <7x7i45qiyo.fsf@ruckus.brouhaha.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <498B11DE.8000804@mrabarnett.plus.com>

Paul Rubin wrote:
> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.
> 
[snip]
You're confusing "ordered" with "sorted"! :-)

A list is an ordered collection, for example.


From skip at pobox.com  Thu Feb  5 11:20:59 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu,  5 Feb 2009 10:20:59 -0600 (CST)
Subject: Is the subprocess module robust enough in 2.4?
Message-ID: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>

The subprocess module was added in Python 2.4.  I'm running 2.4.5 at work.
I know it's seen many bugfixes since first released.  Is the version in 2.4
robust enough to use in preference to os.popen and friends?

Thx,

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From deets at nospam.web.de  Thu Feb  5 11:22:31 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 17:22:31 +0100
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8892.1233849621.3487.python-list@python.org>
References: <mailman.8892.1233849621.3487.python-list@python.org>
Message-ID: <6v0i28Fhcr76U1@mid.uni-berlin.de>

mk schrieb:
> 
> (duck)
> 
> 542 comp.lang.python rtfm
> 
> 467 comp.lang.python shut+up
> 
> 263 comp.lang.perl rtfm
> 
> 45 comp.lang.perl shut+up

It appears to me that comp.lang.perl isn't even active anymore. Or 
googles interface is just crappy.

c.l.perl.misc seems to be the place to search.

And raw numbers are nothing without actual postings. FWIW, I can't 
remember reading the last time RTFM here, but then I usually skip the 
giant-size horse-beatings about GIL removal and encapsulation...


Diez


From mrkafk at gmail.com  Thu Feb  5 11:29:41 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:29:41 +0100
Subject: Flattening lists
In-Reply-To: <498B0F8B.8090109@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>	<gmf0c4$eq$1@ger.gmane.org>
	<498B0F8B.8090109@aim.com>
Message-ID: <gmf45k$h3p$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:

>> Is list creation really more costly than above?
>>
> Probably not.  I wrote a small test program using a list several levels 
> deep, each list containing 5 sublists at each level and finally just a 
> list of numbers.  Flattening 1000 times took about 3.9 seconds for the 
> one creating a list at each level, and 3.2 for the one not creating the 
> list at each level.

Hmm, I'm surprised by even that! Apparently list creation is more 
expensive than I thought - it seems somewhat more expensive than the 
cost of interpreting bytecode for "if var is None". Either list creation 
is somewhat costly, or "if var is None" is really cheap.

Regards,
mk



From apt.shansen at gmail.com  Thu Feb  5 11:41:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:41:36 -0800
Subject: Flattening lists
In-Reply-To: <gmf45k$h3p$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf0c4$eq$1@ger.gmane.org> <498B0F8B.8090109@aim.com>
	<gmf45k$h3p$1@ger.gmane.org>
Message-ID: <7a9c25c20902050841y57169afeid2d3b708faeafad6@mail.gmail.com>

> Either list creation is somewhat
> costly, or "if var is None" is really cheap.

"if x is y" is extremely cheap, I believe. Unlike most comparisons
which are (relatively) expensive, that one is just comparing simple
object address. You can't override "is" so there's a whole series of
checks that don't have to get done. You don't have to go through the
richcompare machinery, check if there's a __ne__, etc, etc.

--S


From james at agentultra.com  Thu Feb  5 11:45:55 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 05 Feb 2009 16:45:55 +0000
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <873aesbzng.fsf@agentultra.com>

mk <mrkafk at gmail.com> writes:

> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk

http://mail.python.org/pipermail/python-list/2005-July/330367.html


From siona at chiark.greenend.org.uk  Thu Feb  5 11:49:22 2009
From: siona at chiark.greenend.org.uk (Sion Arrowsmith)
Date: 05 Feb 2009 16:49:22 +0000 (GMT)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<mailman.8885.1233843910.3487.python-list@python.org>
Message-ID: <Ibk*KySys@news.chiark.greenend.org.uk>

mk  <mrkafk at gmail.com> wrote:
>Brian Allen Vanderburg II wrote:
>> I think it may be just a 'little' more efficient to do this:
>> 
>> def flatten(x, res=None):
>>    if res is None:
>>       res = []
>>    for el in x:
>>       if isinstance(el, (tuple, list)):
>>          flatten(el, res)
>>       else:
>>          res.append(el)
>>    return res
>
>
>Hmm why should it be more efficient [than
def flatten(x):
    res = []
    for el in x:
        if isinstance(el,list):
            res.extend(flatten(el))
       else:
            res.append(el)
    return res

]? extend operation should not be very costly?

It's not a question of extend/append, it's the fact that your
original function creates (and destroys) a new list for every
recursive call. Which, if you've got large nested lists, will
have an impact.

-- 
\S -- siona at chiark.greenend.org.uk -- http://www.chaos.org.uk/~sion/
   "Frankly I have no feelings towards penguins one way or the other"
        -- Arthur C. Clarke
   her nu become? se bera eadward ofdun hl?ddre heafdes b?ce bump bump bump


From rdmurray at bitdance.com  Thu Feb  5 11:49:25 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 16:49:25 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
Message-ID: <gmf5al$m68$1@ger.gmane.org>

Baolong zhen <netzhen at gmail.com> wrote:
> On Thu, Feb 5, 2009 at 10:17 PM, mk <mrkafk at gmail.com> wrote:
>
> > Brian Allen Vanderburg II wrote:
> > >> def flatten(x):
> > >>     res = []
> > >>     for el in x:
> > >>         if isinstance(el,list):
> > >>             res.extend(flatten(el))
> > >>         else:
> > >>             res.append(el)
> > >>     return res
> >
> > >
> > > I think it may be just a 'little' more efficient to do this:
> > >
> > > def flatten(x, res=None):
> > >    if res is None:
> > >       res = []
> > >
> > >    for el in x:
> > >       if isinstance(el, (tuple, list)):
> > >          flatten(el, res)
> > >       else:
> > >          res.append(el)
> > >
> > >    return res
> >
> >
> > Hmm why should it be more efficient? extend operation should not be very
> > costly?
>
> less list creation.

(Took me a while to find the content of your post because
you top posted it.  I've taken the liberty of correcting that.)

This is all premature optimization, except for the goopy code, which is
presumably used enough to make it worth optimizing.  And guess what?
The goopy code wins.  What the people theorizing about the speed of
extend vs list creation miss is that the things with high overhead in the
above functions are (1) isinstance and (2) the recursive function call.
The goopy code avoids this by using type and is, and by unrolling the
lowest level without a function call.  On the other hand, extend
_is_ faster than append if you aren't creating a new list, so the
goopy code can be optimized a little more.

I remembered the bit about high function call overhead, but the rest
of it measured:

temp.py
---------------------------------------------------------------------------------
from __future__ import print_function
from timeit import Timer

def flatten1(x):
    res = []
    for el in x:
        if isinstance(el, list):
            res.extend(flatten1(el))
        else:
            res.append(el)
    return res

def flatten1a(x):
    res = []
    for el in x:
        if isinstance(el, (tuple, list)):
            res.extend(flatten1a(el))
        else:
            res.append(el)
    return res

def flatten1b(x):
    res = []
    for el in x:
        if type(el) is list or type(el) is tuple:
            res.extend(flatten1b(el))
        else:
            res.append(el)
    return res


def flatten2(x, res=None):
    if res is None:
       res = []
    for el in x:
       if isinstance(el, list):
          flatten2(el, res)
       else:
          res.append(el)
    return res


def flatten2a(x, res=None):
    if res is None:
       res = []
    for el in x:
       if isinstance(el, (tuple, list)):
          flatten2a(el, res)
       else:
          res.append(el)
    return res


def flatten2b(x, res=None):
    if res is None:
       res = []
    for el in x:
       if type(el) is list or type(el) is tuple:
          flatten2b(el, res)
       else:
          res.append(el)
    return res



def flatten3z(seq):
  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      for val in x:
        lst.append(val)
    else:
      lst.append(x)
  return lst

def flatten3(seq):
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten3z(el))
    else:
      lst.append(el)
  return lst


def flatten3y(seq):
  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      lst.extend(x)
    else:
      lst.append(x)
  return lst

def flatten3a(seq):
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten3y(el))
    else:
      lst.append(el)
  return lst



l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]

cases = dict(
    base = Timer(),
    c1 = Timer("flatten1(l)", "from temp import flatten1, l"),
    c1a = Timer("flatten1a(l)", "from temp import flatten1a, l"),
    c1b = Timer("flatten1b(l)", "from temp import flatten1b, l"),
    c2 = Timer("flatten2(l)", "from temp import flatten2, l"),
    c2a = Timer("flatten2a(l)", "from temp import flatten2a, l"),
    c2b = Timer("flatten2b(l)", "from temp import flatten2b, l"),
    c3 = Timer("flatten3(l)", "from temp import flatten3, l"),
    c3a = Timer("flatten3a(l)", "from temp import flatten3a, l"),
)

if __name__=="__main__":
    for (name, case) in sorted(cases.items()):
        print("{0:4s} {1}".format(name, case.timeit()))

-----------------------------------------------------------------------------

It is also interesting to note that python3.0 is faster in this
particular case (unless there are timing vagrancies on my machine, which
is possible, though the results were fairly consistent over several runs
of the script).  The second run below is using python2.6.1.

>src/python/Python-3.0/python temp.py
base 0.0278329849243
c1   30.4776289463
c1a  44.3886289597
c1b  32.5621030331
c2   25.6131818295
c2a  39.0944678783
c2b  27.1573381424
c3   15.346280098
c3a  14.3178970814

>python temp.py 
base 0.0288269519806
c1   35.8193409443
c1a  52.3054969311
c1b  36.3652667999
c2   32.3255820274
c2a  47.71251297
c2b  32.6813359261
c3   16.6060569286
c3a  15.1056449413

--RDM



From linuxguy123 at gmail.com  Thu Feb  5 12:13:15 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Thu, 05 Feb 2009 10:13:15 -0700
Subject: HOWTO for setting up a PyQt project in Eclipse ?
Message-ID: <1233853995.25301.12.camel@localhost.localdomain>

Does anyone know of a HOWTO for setting up a PyQt project in Eclipse ?

I know about setting up a PyDev project, just wondering how to integrate
the QtDesigner parts.  

For example, should I save the QtDesigner project in the root PyDev
directory ?

Thanks



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:03 -0200
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <op.uovfp4ptx6zn5v@gabriel.sleipnir-bsas>

En Thu, 05 Feb 2009 04:48:13 -0200, Spacebar265 <spacebar265 at gmail.com>
escribi?:

> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.

Read the file one line at a time, and process each line one character at a
time:

with open(filename, "r") as f:
    for line in f:
      for c in line:
        process(c)

But probably you want to process one *word* at a time; the easiest way
(perhaps inaccurate) is to just split on whitespace:

    ...
      for word in line.split():
        process(word)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:12 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:12 -0200
Subject: sorting mesh data an from abaqus simulation
References: <f90d1a1c0902020410p3233185ey8ad425edfcff18d6@mail.gmail.com>
Message-ID: <op.uovgq702x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 10:10:15 -0200, Alessandro Zivelonghi
<zasaconsulting at gmail.com> escribi?:

> *Ntop = odb.rootAssembly.instances['PART-1-1'].nodeSets['TOP'].nodes
> *
> Problem:
> 1) the list of nodes Ntop contains all the node labels [2673,   2675,
> 2676,   2677,   2678,   3655,   3656, 119939, 124154, 127919] already
> ordered in ascending order.
> What I need is the same list *ordered by coordinate_x* of each node, i.e.
> from left to right in the model (unfortunately, for example node 124154
> cames before node 3656 in the model, if you read the model from left to
> right)

Use the key= argument to the sorted() builtin function
<http://docs.python.org/library/functions.html#sorted>

def get_node_x(node):
    return node.coordinates[0]

sorted_nodes = sorted(Ntop, key=get_node_x)

(For a list of reasonable size, that's fine. For a giant list, this could
be written more efficiently, although less readable)

> 1b) I don't understand which kind of data are EL, N, Ntop (list?) and how
> can I sort Ntop  with the criterium based on coordinate_x (coordinate[0])

AFAIK those are plain lists. You can try:

py> print type(Ntop)

and see what happens. If you don't get <type 'list'>, try with:

py> type(Ntop).mro()

to see the chain of base classes.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:21 -0200
Subject: subprocess.Popen not creating a pipe
References: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
	<6c3f5e6c0902011200s47372b8g49c794b7fa62a06b@mail.gmail.com>
Message-ID: <op.uovhcrjxx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 18:00:36 -0200, Andrew Parker <gbofspam at gmail.com>
escribi?:

> On Sun, Feb 1, 2009 at 1:46 PM, Andrew Parker <gbofspam at gmail.com> wrote:
>> I'm having some fun with Popen.  I have the following line:
>>
>>    process = subprocess.Popen(command, stdout=subprocess.PIPE,
>> stderr=subprocess.STDOUT)
>>    print process.stdout
>>
>> Under normal circumstances, this displays:
>>
>>    <open file '<stdout>', mode 'w' at 0xb7f8e068>
>>
>> However, I have a binary that I use to kick off this script, and when
>> that runs, it displays:
>>
>>    None
>>
>> So, two questions:
>>
>>    1.  What the heck is this binary doing that upsets Popen so much?
>>    2.  What can *my script* do to get around this problem.
>>
>> Unfortunately I'm stuck using this binary, so its the python where I
>> have to solve this.
>
> so, tracing through subprocess.Popen, I see that os.pipe() is being
> invoked for stdout.  This is returning (0, 3), and I assume the 0 is
> conflicting with what python is assuming is stdin.  Calling pipe()
> before Popen gets around my problem, as the pipe the Popen gets then
> returns (4,5) which Popen seems happy with.

Seems that "your binary" is closing stdin before running your script, so
the first available file descriptor is 0.

> Sounds like a bug.  Should I report this, or is it expected/known  
> behaviour?

It's hardly a Python error, and I don't think the subprocess module should
consider this very special case, but you may report it at
http://bugs.python.org/ anyway.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:35 -0200
Subject: Structuring Modules with a Ubiquitous Base Class (Circular
	Dependencies)
References: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>
	<b61d3f95-f02f-4a54-8d8a-b62b9285082f@r24g2000vbp.googlegroups.com>
Message-ID: <op.uovgxcczx6zn5v@gabriel.sleipnir-bsas>

En Wed, 04 Feb 2009 21:12:58 -0200, andrew cooke <andrew at acooke.org>
escribi?:

> On Feb 4, 7:49?pm, andrew cooke <and... at acooke.org> wrote:
>> This leads to a circular dependency - the base class wants to import
>> the components, which in turn want to import the base class.
>
> well, to partially answer my own question, this is certainly
> possible.  in the general case it might get quite complex, but for the
> structure described it is quite simple.  the 'trick' is to import the
> component in the *method* of the common base class.
>
> for example:
>
> class Base(object):
>
>     def __init__(self):
>         from first import First
>         from second import Second
>         self.first = lambda *args: First(*args)
>         self.second = lambda *args: Second(*args)
>
> where First, defined in first, subclasses Base in the normal way.
>
> however, i suspect this will have a performance hit, since "linking"
> is being done at "run time" rather than "compile time".  anyone have
> any guidance on how serious that would be?  i guess it could be
> ameliorated by doing the work in the constructor (as above, which is
> just that way for a compact example - in "real life" the components
> are used in a more complex manner).

There is no "linking" step in Python, all is done at run time.
Once a module is imported the first time, any subsequent import is very
cheap.

> and i still suspect there is a more efficient metaclass or similar
> approach.

This approach is fine to me.

-- 
Gabriel Genellina



From python.list at tim.thechases.com  Thu Feb  5 12:26:32 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 05 Feb 2009 11:26:32 -0600
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <498B2148.80401@tim.thechases.com>

> (duck)
> 
> 542 comp.lang.python rtfm
> 467 comp.lang.python shut+up
> 263 comp.lang.perl rtfm
> 45 comp.lang.perl shut+up

Is this where we tell you to shut up? <gdr> ;-)

As others mentioned, the raw numbers don't mean much without a 
total-volume-of-posts to demonstrate the percentage.

It would also be interesting to see how many of those posts are 
concentrated in certain threads -- for the most part, c.l.python 
has been a pretty civil place, but a few threads have degraded 
into puerile spats.

-tkc





From rdmurray at bitdance.com  Thu Feb  5 12:29:46 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 17:29:46 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf5al$m68$1@ger.gmane.org>
Message-ID: <gmf7m9$20a$1@ger.gmane.org>

Quoth rdmurray at bitdance.com:
> This is all premature optimization, except for the goopy code, which is
> presumably used enough to make it worth optimizing.  And guess what?
> The goopy code wins.  What the people theorizing about the speed of
> extend vs list creation miss is that the things with high overhead in the
> above functions are (1) isinstance and (2) the recursive function call.
> The goopy code avoids this by using type and is, and by unrolling the
> lowest level without a function call.  On the other hand, extend
> _is_ faster than append if you aren't creating a new list, so the
> goopy code can be optimized a little more.
> 
> I remembered the bit about high function call overhead, but the rest
> of it measured:

Oooh, that's embarrassing.  Not only didn't I read the code carefully
enough, I didn't test the actual output of the functions.  The goopy
code doesn't flatten to arbitrary depth, so of course it is faster.

--RDM



From fakeaddress at nowhere.org  Thu Feb  5 12:31:56 2009
From: fakeaddress at nowhere.org (Bryan Olson)
Date: Thu, 05 Feb 2009 09:31:56 -0800
Subject: Ordered dict by default
In-Reply-To: <mailman.8900.1233850850.3487.python-list@python.org>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<mailman.8900.1233850850.3487.python-list@python.org>
Message-ID: <tjFil.10045$8_3.4522@flpi147.ffdc.sbc.com>

MRAB wrote:
> Paul Rubin wrote:
>> bearophileHUGS at lycos.com writes:
>>> Now Ruby dicts are ordered by default:
>>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
>>
>> Maybe I didn't read that carefully enough, but it looks like "ordered"
>> means the dict records come out in the same order you inserted them
>> in.  That is if you insert B,A,D,C in that order, you get them out in
>> that order.  I would have thought an ordered dict meant you get A,B,C,D,
>> which seems a lot more useful.
>>
> [snip]
> You're confusing "ordered" with "sorted"! :-)

He's really not.

   http://en.wikipedia.org/wiki/Ordered_set

> A list is an ordered collection, for example.

True.


-- 
--Bryan


From fakeaddress at nowhere.org  Thu Feb  5 12:36:06 2009
From: fakeaddress at nowhere.org (Bryan Olson)
Date: Thu, 05 Feb 2009 09:36:06 -0800
Subject: Ordered dict by default
In-Reply-To: <mailman.8895.1233849922.3487.python-list@python.org>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
	<mailman.8895.1233849922.3487.python-list@python.org>
Message-ID: <onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>

Stephen Hansen wrote:
> Ooh, as an addendum... I found one case where I want insertion-and-update
> order: meaning that its an ordered dictionary that maintains insertion
> order, but
> an update to a particular item moves that item to the back so an update behaves
> like del d[key]; d[key] = value in terms of the key order.
> 
> "Ordered Dictionaries" are a bit fuzzy. :)

A few bits fuzzy. Is the following True or False if dict is insert-ordered?

    dict(a=6, b=7) == dict(b=7, a=6)



-- 
--Bryan


From digitig at gmail.com  Thu Feb  5 12:37:28 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 17:37:28 +0000
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <498B2148.80401@tim.thechases.com>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
Message-ID: <aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>

2009/2/5 Tim Chase <python.list at tim.thechases.com>:

> Is this where we tell you to shut up? <gdr> ;-)

[snip]

> It would also be interesting to see how many of those posts are concentrated
> in certain threads

And, as you have clearly demonstrated, how many of those posts also
contain a smiley or some other form of hedging in a position that
could modify the "unfriendly" text?


-- 
Tim Rowe


From upton at virginia.edu  Thu Feb  5 12:40:24 2009
From: upton at virginia.edu (Dan Upton)
Date: Thu, 5 Feb 2009 12:40:24 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
	<aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>
Message-ID: <5504f9ac0902050940q7eb0d2bp8d17e9650c4b1659@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:37 PM, Tim Rowe <digitig at gmail.com> wrote:
> 2009/2/5 Tim Chase <python.list at tim.thechases.com>:
>
>> Is this where we tell you to shut up? <gdr> ;-)
>
> [snip]
>
>> It would also be interesting to see how many of those posts are concentrated
>> in certain threads
>
> And, as you have clearly demonstrated, how many of those posts also
> contain a smiley or some other form of hedging in a position that
> could modify the "unfriendly" text?

I'd be amused to see "shut up and rtfm ;)"


From digitig at gmail.com  Thu Feb  5 12:42:02 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 17:42:02 +0000
Subject: Couple of noobish question
In-Reply-To: <498b0fb8$0$23714$426a74cc@news.free.fr>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
	<498b0fb8$0$23714$426a74cc@news.free.fr>
Message-ID: <aee48b3c0902050942i6bb467am7c44c3a1a193a4cd@mail.gmail.com>

2009/2/5 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:

> Thanks for the correction - as you may have guessed, I have not used windows
> for years !-)

And I can't get Linux running (more precisely, I can't /keep/
X-Windows running). Isn't it a good job that Python is cross-platform
-- as long as we stay clear of the os module :-)


-- 
Tim Rowe


From engr.amkhan at gmail.com  Thu Feb  5 12:46:03 2009
From: engr.amkhan at gmail.com (Ahmed Majeed)
Date: Thu, 5 Feb 2009 09:46:03 -0800 (PST)
Subject: Python Installation Error
Message-ID: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>

Hi,
I am working over a research project and need Python 2.3 or later to
be installed on my Intel Centrino machine, running Fedora 9 as OS. I
have downloaded latest stable release Python 2.6.1 from Python.org,
but when I tried installing it, terminal returned an error on 'make',
saying:

"Failed to find the necessory Bits to build these modules:
_tkinter     bsddb185,     sunaaudiodev
To find the necessory bits, look in setup.py in detect_modules() for
the module's name."

How should I correct this and go ahead for installation. Anxiously
waiting reply and thanking you in anticiaption.

-Ahmed


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 12:58:50 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 18:58:50 +0100
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8912.1233855452.3487.python-list@python.org>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
	<mailman.8912.1233855452.3487.python-list@python.org>
Message-ID: <498b28c3$0$23719$426a74cc@news.free.fr>

Tim Rowe a ?crit :
> 2009/2/5 Tim Chase <python.list at tim.thechases.com>:
> 
>> Is this where we tell you to shut up? <gdr> ;-)
> 
> [snip]
> 
>> It would also be interesting to see how many of those posts are concentrated
>> in certain threads
> 
> And, as you have clearly demonstrated, how many of those posts also
> contain a smiley or some other form of hedging in a position that
> could modify the "unfriendly" text?
> 
Not to mention when the "rtfm" comes with a pointer to the relevant url 
and a couple explanations.



From bearophileHUGS at lycos.com  Thu Feb  5 13:04:35 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 10:04:35 -0800 (PST)
Subject: where clause
Message-ID: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>

This comes after a small discussion in another Python newsgroup.
Haskell supports a where clause, that's syntactic sugar that allows
you to define things like this:

p = a / b
  where
    a = 20 / len(c)
    b = foo(d)

That means:

a = 20 / len(c)
b = foo(d)
p = a / b

I don't know how much good this syntax can be in my Python programs,
probably I have to use it some time to judge.

In the Python shell you usally have to use a bottom-up style of
programming, while a where may allow you a more top-down too. I can
enjoy this.

Compared to Haskell a possible problem may from mutability, in Haskell
often the order of the operations isn't important (it's only/mostly
significant during I/O), while in Python is generally important.

The interpreter has to look ahead, to use such 'where', because the
point of 'where' is to allow the programmer with such inversions.

In Python you probably want to put a : after where.
But that Haskell syntax also enjoys having where too indented, this is
less easy (or impossible?) to mix with the usual Python syntax.

Bye,
bearophile


From philip at semanchuk.com  Thu Feb  5 13:08:42 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 5 Feb 2009 13:08:42 -0500
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<mailman.8715.1233686654.3487.python-list@python.org>
	<a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>
Message-ID: <51318B30-3A5F-43D8-B2CC-5084F366B02E@semanchuk.com>


On Feb 3, 2009, at 11:37 PM, Victor Lin wrote:

> It does not work. But however, thanks your help. I have tired so many
> methods to do. But it
> crash...crash..deadlock...deadlock..crash...crash... I have no any
> tried success. I am going crazy. Could someone help me, thanks.


Hi Victor,
I have some code that works, although I'm not terribly confident of  
it. The Python documentation in this area is as clear as mud. I'd be  
interested to see if my code works for you as well.

This is part of my function that the Python code calls to set up the  
callback:

if (!PyEval_ThreadsInitialized()) {
    DPRINTF("calling PyEval_InitThreads()\n");
    PyEval_InitThreads();
    // PyEval_InitThreads() acquires the GIL on my behalf but
    // I don't want it at the moment.
    PyEval_ReleaseLock();
}

This sets up the GIL if necessary (i.e. if this is a single-threaded  
program) and is a no-op otherwise (i.e. if the app has already created  
a Python thread).

Then I have this function to perform the callback. It is invoked in a  
new C thread. Comments are inline.

void process_notification(union sigval notification_data) {
     /* Invoked by the system in a new thread as notification of a  
message
        arriving in the queue. */
     PyObject *arglist;
     PyObject *result;
     PyGILState_STATE gstate;
     PyThreadState *main_thread;
     PyThreadState *callback_thread;
     MessageQueue *self = notification_data.sival_ptr;

     DPRINTF("C thread %ld invoked\n", pthread_self());

     // PyGILState_Ensure() implicitly acquires the GIL so I don't need
     // to call PyEval_AcquireLock().
     DPRINTF("Calling PyGILState_Ensure()\n");
     gstate = PyGILState_Ensure();

     // Get the current thread state so that I have an interpreter to
     // which to point.
     DPRINTF("Calling PyThreadState_Get()\n");
     main_thread = PyThreadState_Get();

     // Create a new Python thread for the callback.
     DPRINTF("Calling PyThreadState_New()\n");
     callback_thread = PyThreadState_New(main_thread->interp);

     // Make the callback thread current.
     DPRINTF("Calling PyThreadState_Swap()\n");
     PyThreadState_Swap(callback_thread);

     // Perform the callback.
     arglist = Py_BuildValue("(O)", self->notification_function_param);
     result = PyEval_CallObject(self->notification_function, arglist);
     Py_DECREF(arglist);

     DPRINTF("Done calling\n");

     // Clean up my internal pointers
     Py_XDECREF(self->notification_function);
     Py_XDECREF(self->notification_function_param);
     self->notification_function = NULL;
     self->notification_function_param = NULL;

     // Now unwind the Python thread/GIL stuff above
     DPRINTF("Calling PyThreadState_Swap()\n");
     PyThreadState_Swap(main_thread);

     DPRINTF("Calling PyThreadState_Clear()\n");
     PyThreadState_Clear(callback_thread);

     DPRINTF("Calling PyThreadState_Delete()\n");
     PyThreadState_Delete(callback_thread);

     // PyGILState_Ensure() acquires the lock, but does  
PyGILState_Release()
     // release it? The documentation doesn't say, but it seems like  
it does.
     DPRINTF("Calling PyGILState_Release()\n");
     PyGILState_Release(gstate);

     DPRINTF("exiting thread\n");
};



This code works (in my limited testing) regardless of whether or not  
the Python code has created a thread. For the threaded test, I created  
a background thread that prints "ding!" every second. That thread  
continued to run even after my callback thread was invoked which I  
assume means that I released the GIL properly.

As I mentioned before, this is part of my posix_ipc extension. This  
code (assuming I feel confident enough to release it) will be in the  
next version that should be out soon, so you will have a full working  
example with which to experiment.

HTH,
Philip





From bearophileHUGS at lycos.com  Thu Feb  5 13:10:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 10:10:42 -0800 (PST)
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com> 
	<mailman.8895.1233849922.3487.python-list@python.org>
	<onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>
Message-ID: <80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>

Bryan Olson:
> A few bits fuzzy. Is the following True or False if dict is insert-ordered?
> ? ? dict(a=6, b=7) == dict(b=7, a=6)

In my odict implementation I have disallowed that syntax because if
you want to define a mydict(**kwds) function that allows a syntax
like:

mydict(a=6, b=7)

it takes a dict as argument, such dict is currently not ordered. If
built-in dicts become ordered, then that dict too may become
ordered :-)

Anyway, maybe it's good to ignore the inserting order of items when
you look for odict equality.

Bye,
bearophile


From aahz at pythoncraft.com  Thu Feb  5 13:24:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 Feb 2009 10:24:13 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
Message-ID: <gmfasd$drp$1@panix3.panix.com>

In article <a22c77c4-a812-4e42-8972-6f3eedf72bb9 at l33g2000pri.googlegroups.com>,
Michele Simionato  <michele.simionato at gmail.com> wrote:
>
>Looks fine to me. In some situations you may also use hasattr(el,
>'__iter__') instead of isinstance(el, list) (it depends if you want to
>flatten generic iterables or only lists).

Of course, once you do that, you need to special-case strings...
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From kellrott at gmail.com  Thu Feb  5 13:38:12 2009
From: kellrott at gmail.com (Kyle)
Date: Thu, 5 Feb 2009 10:38:12 -0800 (PST)
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
Message-ID: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>

I wanted to share a Python based project which I've been working on.
Python Integrated Parallel Pipeline EnviRonment (PIPPER) is an MPI
based programming environment that works much like an OpenMP on Python
code.  It is designed to create a python programming environment where
parallel computations on a set of distributed memory processors (you
may call it a cluster, or a Beowulf cluster) is easy to accomplish.
The idea is to make writing parallel code easy in order to promote
rapid development of script based distributed calculations.
There are tools, such as MPI or PVM that help with communicating
between processes running on different machines, but most people are
quickly scared off by the additional complexity in programming.
PIPPER eliminates this barrier to entry by automating the process of
data passing and job scheduling.
Most importantly is that there is no code 'lock-in'.  PIPPER works as
a pre-parser and is designed to be completely backward compatible with
a single CPU python environment.  If you write a script for PIPPER, it
will still work on systems that don't have PIPPER installed.

You can find the source code and documentation at http://pipper.sourceforge.net

A 'Hello Work' example of PIPPER code:

#!/usr/bin/python

import sys
import os

def do_call(x,y):
	print "Hello World", x, y, os.getpid()

if __name__ == '__pipper_main__':
	a_range = range( int(sys.argv[1]) )
	#pragma pipper_start
	for a in  a_range :
		for b in a_range :
			do_call(a,b)
	#pragma pipper_end


From steve at holdenweb.com  Thu Feb  5 13:48:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 13:48:57 -0500
Subject: Ordered dict by default
In-Reply-To: <80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
	<mailman.8895.1233849922.3487.python-list@python.org>	<onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>
	<80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>
Message-ID: <gmfcar$jmh$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Bryan Olson:
>> A few bits fuzzy. Is the following True or False if dict is insert-ordered?
>>     dict(a=6, b=7) == dict(b=7, a=6)
> 
> In my odict implementation I have disallowed that syntax because if
> you want to define a mydict(**kwds) function that allows a syntax
> like:
> 
> mydict(a=6, b=7)
> 
> it takes a dict as argument, such dict is currently not ordered. If
> built-in dicts become ordered, then that dict too may become
> ordered :-)
> 
> Anyway, maybe it's good to ignore the inserting order of items when
> you look for odict equality.
> 
But then they wouldn't be equal. As I said right at the start if this
thread:

> one of the prime issues every time
> this comes up is the inability of the various proponents to agree on how
> dicts should actually be ordered.

The remainder of the thread vindicates that comment.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Thu Feb  5 14:02:51 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 20:02:51 +0100
Subject: Python Installation Error
In-Reply-To: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
References: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
Message-ID: <6v0retFhn667U1@mid.uni-berlin.de>

Ahmed Majeed schrieb:
> Hi,
> I am working over a research project and need Python 2.3 or later to
> be installed on my Intel Centrino machine, running Fedora 9 as OS. I
> have downloaded latest stable release Python 2.6.1 from Python.org,
> but when I tried installing it, terminal returned an error on 'make',
> saying:
> 
> "Failed to find the necessory Bits to build these modules:
> _tkinter     bsddb185,     sunaaudiodev
> To find the necessory bits, look in setup.py in detect_modules() for
> the module's name."
> 
> How should I correct this and go ahead for installation. Anxiously
> waiting reply and thanking you in anticiaption.

You are missing tcl/tk and bsddb development packages. Or if you don't 
care about these functionalities, you should be able to disable them 
using configure.

Diez


From toby at tobiah.org  Thu Feb  5 14:06:39 2009
From: toby at tobiah.org (Tobiah)
Date: Thu, 05 Feb 2009 11:06:39 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <pan.2009.02.05.19.06.25.464020@tobiah.org>


> Hello everybody,
> 
> Any better solution than this?

a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
print str(a).replace('[', '').replace(']', '').split(', ')

;)




From rdmurray at bitdance.com  Thu Feb  5 14:07:15 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 19:07:15 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<873aesbzng.fsf@agentultra.com>
Message-ID: <gmfdd3$ne8$1@ger.gmane.org>

Quoth J Kenneth King <james at agentultra.com>:
> mk <mrkafk at gmail.com> writes:
> 
> > Hello everybody,
> >
> > Any better solution than this?
> >
> > def flatten(x):
> >     res = []
> >     for el in x:
> >         if isinstance(el,list):
> >             res.extend(flatten(el))
> >         else:
> >             res.append(el)
> >     return res
> >
> > a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> > print flatten(a)
> >
> >
> > [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
> >
> > Regards,
> > mk
> 
> http://mail.python.org/pipermail/python-list/2005-July/330367.html

That's worth reading.  I'm not sure why I'm finding this fun, but who
cares.  I tried a couple of other functions after reading that article,
and it looks like a generator that scans the nested lists is actually
the winner, and also is in many ways the most elegant implementation.
Of course, as noted in the emails following above article, the test data
is really inadequate for proper optimization testing ;)

-----------------------------------------------------------------
from __future__ import print_function
from timeit import Timer
from itertools import chain

# This is the one from the article quoted above.
def flatten6(seq):
    i = 0
    while (i != len(seq)):
        while hasattr(seq[i], '__iter__'):
            seq[i:i+1] = seq[i]
        i = i + 1
    return seq


#This is my favorite from a readability standpoint out of
#all the things I tried.  It also performs the best.
def flatten8(seq):
    for x in seq:
        if not hasattr(x, '__iter__'): yield x
        else:
            for y in flatten8(x):
                yield y



l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]



if __name__=="__main__":
    print(l)
    print('flatten6', flatten6(l))
    print('flatten8', list(flatten8(l)))
    print('flatten6', Timer("flatten6(l)", "from temp3 import flatten6, l").timeit())
    print('flatten8', Timer("list(flatten8(l))", "from temp3 import flatten8, l").timeit())


-----------------------------------------------------------------

>src/python/Python-3.0/python temp3.py
[[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten6 32.8386368752
flatten8 30.7509689331

>python temp3.py 
[[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten6 34.730714798
flatten8 32.3252940178

--RDM



From toby at tobiah.org  Thu Feb  5 14:13:20 2009
From: toby at tobiah.org (Tobiah)
Date: Thu, 05 Feb 2009 11:13:20 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<pan.2009.02.05.19.06.25.464020@tobiah.org>
Message-ID: <pan.2009.02.05.19.13.20.476936@tobiah.org>

On Thu, 05 Feb 2009 11:06:39 -0800, Tobiah wrote:

> 
>> Hello everybody,
>> 
>> Any better solution than this?
> 
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]] print str(a).replace('[',
> '').replace(']', '').split(', ')
> 
> ;)

Or:

a = ['text', 'string', 3, [4, 5, 6], [[7, 8], [9, 10]]]
print eval("[" + str(a).replace('[', '').replace(']', '') + "]")

Just tongue in cheek...



From marduk at letterboxes.org  Thu Feb  5 14:30:11 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 05 Feb 2009 14:30:11 -0500
Subject: where clause
In-Reply-To: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
Message-ID: <1233862211.12935.21.camel@localhost.localdomain>

On Thu, 2009-02-05 at 10:04 -0800, bearophileHUGS at lycos.com wrote:
> This comes after a small discussion in another Python newsgroup.
> Haskell supports a where clause, that's syntactic sugar that allows
> you to define things like this:
> 
> p = a / b
>   where
>     a = 20 / len(c)
>     b = foo(d)
> 
> That means:
> 
> a = 20 / len(c)
> b = foo(d)
> p = a / b
> 
> I don't know how much good this syntax can be in my Python programs,
> probably I have to use it some time to judge.
> 
> In the Python shell you usally have to use a bottom-up style of
> programming, while a where may allow you a more top-down too. I can
> enjoy this.
> 

I don't like it for the following reasons:

      * Flat is better than nested.
      * There should be one-- and preferably only one --obvious way to
        do it.

One could imagine this getting "out of hand" e.g.

p = a / b
   where
      a = 20 / len(c)
          where
              c = p / b
      try:
          b = foo(d)
              where
                  d = bar()
      except:
          b = 0


It also begs the question, should the except: clause be written to
handle an exception raised in foo() as well as bar()? or should one also
write a try/except around bar()?

Usually when I'm looking at an identifier (function, class, variable)
being used, I tend to look *up* to see where it is defined.



From andrew.replogle at gmail.com  Thu Feb  5 14:34:29 2009
From: andrew.replogle at gmail.com (Andrew)
Date: Thu, 5 Feb 2009 11:34:29 -0800 (PST)
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
Message-ID: <851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>

On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
> escribi?:
>
>
>
> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> Andrew schrieb:
>
> >> > I'm running into a strange situation with getting incorrect
> >> > returncodes / exit status from python subprocess.call. I'm using a
> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
> >> > java applications to glassfish application server. Below is an example
>
> > I've removed shell=True, unfortunately, if I structure the call like:
>
> > call(["c:/glassfish/bin/asadmin.bat", "list-system-properties", "--
> > host
> > mydomain", "--port 4848", "--user admin", "server-01"])
>
> > It doesn't seem to recognize any arguments after list-system-
> > properties.
>
> Should be:
>
> call(["c:/glassfish/bin/asadmin.bat", "list-system-properties", "--host",
> "mydomain", "--port", "4848", "--user", "admin", "server-01"])
>
> *Every* argument should be an item in the list (your way, "--port 4848" ?
> becomes a single argument, not two: option plus value)
> (This is independent of your other issue)
>
> > If I structure it like:
>
> > call("c:/glassfish/bin/asadmin.bat "+"list-system-properties --host
> > mydomain --port 4848 --user admin server-01")
>
> > Then it executes correctly but still gives invalid returncode of 0
> > when it fails instead of 1.
>
> A similar example works fine for me:
>
> C:\temp>type ret.c
> #include <stdlib.h>
>
> int main(int argc, char* argv[])
> {
> ? ?return atoi(argv[1]);
>
> }
>
> C:\temp>ret 5
>
> C:\temp>echo %errorlevel%
> 5
>
> C:\temp>type testret.bat
> ret %1
>
> C:\temp>testret 3
>
> C:\temp>ret 3
>
> C:\temp>echo %errorlevel%
> 3
>
> C:\temp>type testret.py
> ?from subprocess import call
> ret = call(["testret.bat", "42"])
> print "testret.bat exit code =", ret
>
> C:\temp>python testret.py
>
> C:\temp>ret 42
> testret.bat exit code = 42
>
> C:\temp>python -V
> Python 2.6
>
> C:\temp>ver
>
> Microsoft Windows XP [Versi?n 5.1.2600]
>
> --
> Gabriel Genellina

I've tried this several ways now. It seems to be something specific
with python and asadmin.bat.

I've tried the following manually in the cmd.exe prompt:

------
C:\temp>c:\glassfish\bin\asadmin.bat list-system-properties
Instance-01
....
properties here
....

Command list-system-properties executed successfully.

C:\temp>echo %errorlevel%
0

C:\temp>c:\glassfish\bin\asadmin.bat list-system-properties
Instance-05    //note that Instance-05 does not exist
Cannot determine type for target : Instance-05
CLI137 Command list-system-properties failed.

C:\temp>echo %errorlevel%
1

C:\temp>ping 019293.com
Ping request could not find host 019293.com. Please check the name and
try again
.

C:\temp>echo %errorlevel%
1

C:\temp>ping google.com

Pinging google.com [74.125.45.100] with 32 bytes of data:

Reply from 74.125.45.100: bytes=32 time=48ms TTL=234
Reply from 74.125.45.100: bytes=32 time=66ms TTL=234
Reply from 74.125.45.100: bytes=32 time=63ms TTL=234
Reply from 74.125.45.100: bytes=32 time=44ms TTL=234

Ping statistics for 74.125.45.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 44ms, Maximum = 66ms, Average = 55ms

C:\temp>echo %errorlevel%
0
----------------------------------------

Then I tried the following in python (2.6.1)

---script---
import subprocess
import sys


try:
    retcode = subprocess.call(["ping","019293.com"])
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e

try:
    retcode = subprocess.call(["ping","google.com"])
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e


try:
    retcode = subprocess.call(["c:/glassfish/bin/asadmin.bat","list-
system-properties","Instance-01"], shell=False)
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e

try:
    retcode = subprocess.call(["c:/glassfish/bin/asadmin.bat","list-
system-properties","Instance-05"], shell=False)
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e
---script---

Executed Output:

---output---
C:\temp>c:\Python26\python.exe example2.py
Ping request could not find host 019293.com. Please check the name and
try again.
Child returned 1

Pinging google.com [74.125.67.100] with 32 bytes of data:

Reply from 74.125.67.100: bytes=32 time=244ms TTL=239
Reply from 74.125.67.100: bytes=32 time=244ms TTL=239
Reply from 74.125.67.100: bytes=32 time=191ms TTL=234
Reply from 74.125.67.100: bytes=32 time=59ms TTL=239

Ping statistics for 74.125.67.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 59ms, Maximum = 244ms, Average = 184ms
Child returned 0

...glassfish properties for Instance-01 display here...
Command list-system-properties executed successfully.
Child returned 0

Cannot determine type for target : Instance-05
CLI137 Command list-system-properties failed.
Child returned 0

C:\temp>
---output---

Notice how python never gets the correct returncode from asadmin.bat
but I can get the correct returncode from the shell every time. Can
anyone tell me why Python wouldn't be able to get the correct
returncode for asadmin?

TIA,

Andrew



From bearophileHUGS at lycos.com  Thu Feb  5 14:57:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 11:57:34 -0800 (PST)
Subject: where clause
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
	<mailman.8918.1233862206.3487.python-list@python.org>
Message-ID: <2b9a5854-a5bd-4f69-b302-3bcc72c3107b@b38g2000prf.googlegroups.com>

Albert Hopkins:

> One could imagine this getting "out of hand" e.g.

Yes, any syntax can be abused (your example isn't abusive enough).


>       a = 20 / len(c)
>           where
>               c = p / b
>       try:
>           b = foo(d)
>               where
>                   d = bar()
>       except:
>           b = 0
>
> It also begs the question, should the except: clause be written to
> handle an exception raised in foo() as well as bar()? or should one also
> write a try/except around bar()?

This code:

>       a = 20 / len(c)
>           where
>               c = p / b
>       try:
>           b = foo(d)
>               where
>                   d = bar()
>       except:
>           b = 0

Equals to:

a = 20 / len(p / b)
try:
    b = foo(bar())
except:
    b = 0
p = a / b

So the answer is positive.


> Usually when I'm looking at an identifier (function, class, variable)
> being used, I tend to look *up* to see where it is defined.

Right, the main purpose of where is to change that usual way, if you
want.

Note that where may also be designed to create a new scope (as in
Haskell, I think), that's why I have inlined the bar and p/b.

Bye,
bearophile


From clp2 at rebertia.com  Thu Feb  5 15:08:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 12:08:09 -0800
Subject: os.system issues
In-Reply-To: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <50697b2c0902051208w40c7c3f3k39c1d4c4aeb08990@mail.gmail.com>

On Thu, Feb 5, 2009 at 6:00 AM, Youri Lammers
<youri_lammers_88 at hotmail.com> wrote:
> Ok,
>
> I want to run a program called 'muscle' with my python script,
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
>
> import os
> args = ['-in filename', '-out filename']

As Christian indirectly points out, that's an incorrect tokenization
of the arguments. Remember that the shell has no knowledge of what
arguments a program takes and so doesn't treat the arguments
differently or specially for each program; it instead applies the
consistent rule of breaking arguments at spaces (unless you put an
argument in quotes). Thus, args should be:

args = ['-in', 'filename', '-out', 'filename']

The fact that the program happens to semantically pair those adjacent
arguments together is entirely up to and done by the program itself.
You can verify this by printing sys.argv from a command-line Python
program which you've given arguments to.

And of course, you'd only use `args` like this if you were using the
`subprocess` module; as others have pointed out, os.system() is more
primitive and just takes a single string of the entire command. But
`subprocess` is better anyway.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From stefan_ml at behnel.de  Thu Feb  5 15:10:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 05 Feb 2009 21:10:10 +0100
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
In-Reply-To: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
References: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
Message-ID: <498b47a2$0$31338$9b4e6d93@newsspool4.arcor-online.net>

Kyle wrote:
> def do_call(x,y):
> 	print "Hello World", x, y, os.getpid()
> 
> if __name__ == '__pipper_main__':
> 	a_range = range( int(sys.argv[1]) )
> 	#pragma pipper_start
> 	for a in  a_range :
> 		for b in a_range :
> 			do_call(a,b)
> 	#pragma pipper_end

I'm not a big fan of comments that change semantics. Wouldn't a modified
'with' statement look better?

We have a couple of other syntax proposals in the Cython Wiki.

http://wiki.cython.org/enhancements/parallel

Stefan


From michele.simionato at gmail.com  Thu Feb  5 15:16:45 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 5 Feb 2009 12:16:45 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
Message-ID: <d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>

On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
>
>
> >Looks fine to me. In some situations you may also use hasattr(el,
> >'__iter__') instead of isinstance(el, list) (it depends if you want to
> >flatten generic iterables or only lists).
>
> Of course, once you do that, you need to special-case strings...

Strings are iterable but have no __iter__ method, which is fine in
this context, since I would say 99.9% of times one wants to treat them
as atomic objects, so no need to special case.


From benjamin.kaplan at case.edu  Thu Feb  5 15:18:54 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 5 Feb 2009 15:18:54 -0500
Subject: Python Installation Error
In-Reply-To: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
References: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
Message-ID: <ec96e1390902051218u57424bb4tb4eab53d5c09de42@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:46 PM, Ahmed Majeed <engr.amkhan at gmail.com> wrote:

> Hi,
> I am working over a research project and need Python 2.3 or later to
> be installed on my Intel Centrino machine, running Fedora 9 as OS. I
> have downloaded latest stable release Python 2.6.1 from Python.org,
> but when I tried installing it, terminal returned an error on 'make',
> saying:
>
> "Failed to find the necessory Bits to build these modules:
> _tkinter     bsddb185,     sunaaudiodev
> To find the necessory bits, look in setup.py in detect_modules() for
> the module's name."
>
> How should I correct this and go ahead for installation. Anxiously
> waiting reply and thanking you in anticiaption.



Are you sure there was an error in make? What you see isn't a problem, it's
just a notification. Make is telling you the tk, bsddb, and sunaaudiodev
modules won't be installed because you don't have the libraries on your
computer. If it got that far, I'm almost certain that the build was
sucessful. Make install should work from there. If you aren't going to use
those modules, go ahead and install it, otherwise download those libraries
and try again.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090205/8d0c9892/attachment.html>

From matzke at berkeley.edu  Thu Feb  5 15:28:13 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 12:28:13 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>
	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
Message-ID: <498B4BDD.701@berkeley.edu>



Scott David Daniels wrote:
> M.-A. Lemburg wrote:
>> On 2009-02-05 10:08, Nick Matzke wrote:
>>> ..., I can run this in the ipython shell just fine:
>>> a = ["12", "15", "16", "38.2"]
>>> dim = int(sqrt(size(a)))
>>> ...But if I move these commands to a function in another file, it 
>>> freaks out:
>> You need to add:
>>
>> from math import sqrt
> or:
>     from cmath import sqrt
> or:
>     from numpy import sqrt





The weird thing is, when I do this, I still get the error:

============
nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
make_half_square_array
nick at mws2[phylocom]|24> d = make_half_square_array(a)
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/bioinformatics/phylocom/<ipython console> in <module>()

/bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
make_half_square_array(linear_version_of_square_array)
    1548         from numpy import sqrt
    1549         a = linear_version_of_square_array
-> 1550         dim = int(sqrt(size(a)))
    1551
    1552

NameError: global name 'sqrt' is not defined
nick at mws2[phylocom]|25>
============

Is there some other place I should put the import command?  I.e.:
1. In the main script/ipython command line

2. In the called function, i.e. make_half_square_array() in 
LR_run_functions_v2.py

3. At the top of LR_run_functions_v2.py, outside of the individual 
functions?

Thanks...sorry for the noob questions!
Nick



> 
> Each with their own, slightly different, meaning.
> Hence the reason many of us prefer to import the module
> and reference the function as a module attribute.
> 
> Note that _many_ (especially older) package documents describe
> their code without the module name.  I believe that such behavior
> is because, when working to produce prose about a package, it
> feels too much like useless redundancy when describing each function
> or class as "package.name".
> 
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From kellrott at gmail.com  Thu Feb  5 15:40:29 2009
From: kellrott at gmail.com (Kyle)
Date: Thu, 5 Feb 2009 12:40:29 -0800 (PST)
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
References: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
	<498b47a2$0$31338$9b4e6d93@newsspool4.arcor-online.net>
Message-ID: <d87d3ad9-b58a-4259-90d9-9f98142f0f03@p2g2000prf.googlegroups.com>

PIPPER doesn't yet have a very large user base, and is still in
Alpha.  So if there is enough demand, syntax changes would still be
possible at this stage.

Kyle

> I'm not a big fan of comments that change semantics. Wouldn't a modified
> 'with' statement look better?
>
> We have a couple of other syntax proposals in the Cython Wiki.
>
> http://wiki.cython.org/enhancements/parallel
>
> Stefan



From matt.dubins at sympatico.ca  Thu Feb  5 15:40:29 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Thu, 5 Feb 2009 12:40:29 -0800 (PST)
Subject: tkSimpleDialog window focus problem
References: <238e1e3c-66aa-45de-9a67-2b91e15bc465@x6g2000pre.googlegroups.com>
Message-ID: <987c2c11-7b16-4df2-97b1-6185010c333f@i18g2000prf.googlegroups.com>

After much tinkering, I figured out the problem.  Before the call to
the ftp.login function, I had another simpledialog asking for a
userid.  The focus was leaving the parent Tk window altogether right
after userid entry.  So, right after the call to obtain the userid
from the user, i called the Frame.focus_force() method.  Observe:

self.userid = tkSimpleDialog.askstring("UTSCID Entry","UTSCID:")
self.focus_force()

Now, the next tkSimpleDialog.askstring call that I made ACTUALLY gets
the keyboard focus automatically.

Cheers,
Matt


On Feb 4, 10:21?am, inkhorn <matt.dub... at sympatico.ca> wrote:
> Hi all,
>
> As part of the program I've created and am maintaining, the user has
> to type in his/her username and password into tkinter simple dialog
> windows. ?What you'll see below is that I've nested an askstring
> dialog window within a call to use the ftp module to login to an FTP
> server.
>
> result = self.ftp.login(self.userid, tkSimpleDialog.askstring
> ("Password Entry",
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "Password:", show="*"))
>
> Annoyingly, every time this password entry window pops up, the focus
> does not go on it automatically. ?Anyone know what I can do to put the
> focus on it automatically, while *not* storing the user's password in
> my script for the remainder of its runtime?
>
> Thanks,
> Matt Dubins



From python-url at phaseit.net  Thu Feb  5 15:50:07 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 5 Feb 2009 20:50:07 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb  5)
Message-ID: <gmfjdv$jg8$1@lairds.us>

QOTW:  "Findability trumps usability. If you can't find it, you can't use
it." - information architect Robert Morville
    
    
    Boolean expressions don't necesarily yield a boolean type - and that's
    very useful:
        http://groups.google.com/group/comp.lang.python/t/e834202d1a6a919/
    
    Using __del__ is rather fragile:
        http://groups.google.com/group/comp.lang.python/t/c1e7fccbfd7e5e73/
        http://groups.google.com/group/comp.lang.python/t/25d36f0a74245bc4/
    
    Good or bad usage of __repr__?
        http://groups.google.com/group/comp.lang.python/t/d7e2b1637db02f2a/
    
    Which OOP concepts apply to the Python language? A long thread, at the
    end mostly focused on access restrictions:
        http://groups.google.com/group/comp.lang.python/t/abf06e897aacc3d9/
    
    A class implementing an iterator, and how the iterator protocol works:
        http://groups.google.com/group/comp.lang.python/t/edaa3cc79a0581ea/
    
    Computing the n-th root of big numbers:
        http://groups.google.com/group/comp.lang.python/t/7eb4facfe4b0ffa1/
    
    A list that knows when any of its elements is modified:
        http://groups.google.com/group/comp.lang.python/t/4b7f993274ece50d/
    
    Embedding 2.6.1 in Windows doesn't work due to missing C runtime
    libraries:
        http://groups.google.com/group/comp.lang.python/t/3ec6af1279a162ca/
    
    How to call Python code from another thread written in C:
        http://groups.google.com/group/comp.lang.python/t/1d05f3f215346249/
    
    How SQLAlchemy compares to similar ORMs:
        http://groups.google.com/group/comp.lang.python/t/547d0a7c0477293c/
    
    

    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From rNOSPAMon at flownet.com  Thu Feb  5 15:52:42 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 05 Feb 2009 12:52:42 -0800
Subject: WebError documentation?
Message-ID: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>

Is there any?  Where is it?  Extensive Googling has proven fruitless.

Thanks,
rg


From deets at nospam.web.de  Thu Feb  5 15:57:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 21:57:52 +0100
Subject: global name 'sqrt' is not defined
In-Reply-To: <mailman.8921.1233865754.3487.python-list@python.org>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
	<mailman.8921.1233865754.3487.python-list@python.org>
Message-ID: <6v126hFhj1beU1@mid.uni-berlin.de>

Nick Matzke schrieb:
> 
> 
> Scott David Daniels wrote:
>> M.-A. Lemburg wrote:
>>> On 2009-02-05 10:08, Nick Matzke wrote:
>>>> ..., I can run this in the ipython shell just fine:
>>>> a = ["12", "15", "16", "38.2"]
>>>> dim = int(sqrt(size(a)))
>>>> ...But if I move these commands to a function in another file, it 
>>>> freaks out:
>>> You need to add:
>>>
>>> from math import sqrt
>> or:
>>     from cmath import sqrt
>> or:
>>     from numpy import sqrt
> 
> 
> 
> 
> 
> The weird thing is, when I do this, I still get the error:
> 
> ============
> nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
> nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
> make_half_square_array
> nick at mws2[phylocom]|24> d = make_half_square_array(a)
> ---------------------------------------------------------------------------
> NameError                                 Traceback (most recent call last)
> 
> /bioinformatics/phylocom/<ipython console> in <module>()
> 
> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
> make_half_square_array(linear_version_of_square_array)
>    1548         from numpy import sqrt
>    1549         a = linear_version_of_square_array
> -> 1550         dim = int(sqrt(size(a)))
>    1551
>    1552
> 
> NameError: global name 'sqrt' is not defined
> nick at mws2[phylocom]|25>
> ============
> 
> Is there some other place I should put the import command?  I.e.:
> 1. In the main script/ipython command line
> 
> 2. In the called function, i.e. make_half_square_array() in 
> LR_run_functions_v2.py
> 
> 3. At the top of LR_run_functions_v2.py, outside of the individual 
> functions?

The latter. Python's imports are always local to the module/file they 
are in, not globally effective.


Diez


From http  Thu Feb  5 16:27:46 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 13:27:46 -0800
Subject: where clause
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
	<mailman.8918.1233862206.3487.python-list@python.org>
	<2b9a5854-a5bd-4f69-b302-3bcc72c3107b@b38g2000prf.googlegroups.com>
Message-ID: <7x7i44poa5.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> Note that where may also be designed to create a new scope (as in
> Haskell, I think), that's why I have inlined the bar and p/b.

In Haskell, "where" is only allowed at the outermost level of a
function definition (including a nested one), not in an arbitrary
expression.


From sluggoster at gmail.com  Thu Feb  5 16:37:48 2009
From: sluggoster at gmail.com (Mike Orr)
Date: Thu, 5 Feb 2009 13:37:48 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8548.1233532052.3487.python-list@python.org>
Message-ID: <8491d636-4084-4baf-8cc8-af2f800fd361@s9g2000prg.googlegroups.com>

On Feb 1, 3:47?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> Googling, I found SQLalchemy,
> which looks quit good.
> SQLAlchemy is very good. I'm very slowly migrating our entire codebase to it.
> ?
>
>
> But as I only want to choose once,
> I googled for ?"SQLalchemy alternatives",
> but it didn't find many answers.
> (Storm / Grok are of no interest, because manipulating the structure of the database is a key issue).
> There's a few other alternatives-- if you google "Python ORM" you'll find a lot more, and PyPi might have a list. But IMHO, SQLAlchemy is the best of breed so far. Its very, very flexible and doesn't really impose on you with any rules about how you must do things.
> Storm's not bad, don't get me wrong!
> But one question on your requirements: manipulating the structure of the database. How so? If you mean that you want to be able to modify the object wrapper to change some field of a table and have that change propagated to the database layer... then SQLAlchemy doesn't support that. If you add new tables it'll create them, and it MIGHT add new columns or indexes if you add them after and it notices they aren't there... but I'm not entirely sure on that.

engine.execute("ALTER TABLE ...")

However, this may confuse ORM objects already in memory as well as
transactions, so clear these out both before and afterward.  The
syntax is database specific.  MySQL can add and delete columns and
change a column's type.  SQLite can only rename tables.  However, your
ORM objects won't know about the new columns unless you reinitialize
the Table objects and mapper with autoloading.  So it's best to modify
the schema in a standalone program that does not use the ORM.

As for modifying the columns in the Table objects and propagating the
changes to the database, you can't do that.  You have to execute
"ALTER TABLE" as a string command.  SQLAlchemy would have to add a
whole new layer to deal with alternations at the Table or SQL builder
level, and in the end they're still database specific.




From gandalf at shopzeus.com  Thu Feb  5 16:42:26 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 05 Feb 2009 22:42:26 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <gmc9ot$ops$1@online.de>
References: <mailman.8719.1233689579.3487.python-list@python.org>
	<gmc9ot$ops$1@online.de>
Message-ID: <498B5D42.6080408@shopzeus.com>

Uwe Grauer ?rta:
> Laszlo Nagy wrote:
>   
>> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
>> FireBird 1.5?
>>
>> My problem:
>>
>>    * python 2.6 already installed on a server
>>    * there is a firebird 1.5 database on the same server
>>    * I need to access it from python 2.6
>>
>> Any thoughts?
>>
>>
>>     
>
> Get it from here:
> http://www.firebirdsql.org/index.php?op=devel&sub=python
>   
Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can 
only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going 
to downgrade. :-(



From btaylordesign at gmail.com  Thu Feb  5 16:47:09 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 5 Feb 2009 13:47:09 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com> 
	<mailman.8757.1233728172.3487.python-list@python.org>
Message-ID: <e017ada1-50e3-4795-a516-f70f2d8e3325@s1g2000prg.googlegroups.com>

On Feb 4, 12:16?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 04 Feb 2009 00:36:40 -0200, Brandon Taylor ?
> <btaylordes... at gmail.com> escribi?:
>
>
>
> > On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
> >> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> >> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> >> > <btaylordes... at gmail.com> escribi?:
> >> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
> >> > > What is happening is that the extract method is creating a folder > ?
> >> > with
> >> > > the name of 'zip_name' and extracting the files to it. Example:
> >> > extract will create all directories in member name. Use open instead:
> >> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> >> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as ?
> >> > target:
> >> > ? ? ?shutil.copyfileobj(source, target)
> > Ok, the first thing I needed to do was add:
>
> > from __future__ import with_statement at the beginning of my file
>
> That should not be necesary with your Python version (2.6.1 isn't it?)
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ? ? ? ? ? ? ? ? ? with open(os.path.join(thumbnail_path,
> > thumbnail_image), 'wb') as target:
> > ? ? ? ? ? ? ? ? ? ? ? ? shutil.copyfileobj(source, target)
>
> > Returns an error on the first line:
>
> > ZipExtFile instance has no attribute '__exit__'
>
> Ouch, sorry, this new feature will appear in the not-yet-released 2.7 ?
> version...
> Try this instead:
>
> source = zip_file.open(zip_name + '/' + thumbnail_image)
> try:
> ? ?with open(os.path.join(thumbnail_path, thumbnail_image), 'wb') as target:
> ? ? ?shutil.copyfileobj(source, target)
> finally:
> ? ?source.close()
>
> --
> Gabriel Genellina

Awesome. Works perfectly, and saves me the extra step of having to
move the files.

Many, many thanks!

Kind regards,
Brandon


From tjreedy at udel.edu  Thu Feb  5 17:09:16 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:09:16 -0500
Subject: Ordered dict by default
In-Reply-To: <7x7i45qiyo.fsf@ruckus.brouhaha.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <gmfo27$t5d$4@ger.gmane.org>

Paul Rubin wrote:
> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.

This seems to have become the more common meaning of 'ordered dict'.

>  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.

I once thought that too, but this would be a 'sorted dict'.

tjr



From tjreedy at udel.edu  Thu Feb  5 17:11:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:11:30 -0500
Subject: Ordered dict by default
In-Reply-To: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
Message-ID: <gmfo6d$t5d$5@ger.gmane.org>

andrew cooke wrote:
> so what is happening with pep 372?
> 
> http://www.python.org/dev/peps/pep-0372/

There seems to be a number of unanswered questions as to the exact 
behavior (see Q and A section).  The author needs to promote more 
discussion by those interested, including here, and make a decision.



From tjreedy at udel.edu  Thu Feb  5 17:20:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:20:06 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <gmfomg$t5d$6@ger.gmane.org>

mk wrote:
> 
> (duck)
> 
> 542 comp.lang.python rtfm

What is so unfriendly about 'read the fine manual'?



From lionel.keene at gmail.com  Thu Feb  5 17:22:35 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:22:35 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
Message-ID: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>

Hello,
I have data stored in binary files. Some of these files are
huge...upwards of 2 gigs or more. They consist of 32-bit float complex
numbers where the first 32 bits of the file is the real component, the
second 32bits is the imaginary, the 3rd 32-bits is the real component
of the second number, etc.

I'd like to be able to read in just the real components, load them
into a numpy.ndarray, then load the imaginary coponents and load them
into a numpy.ndarray.  I need the real and imaginary components stored
in seperate arrays, they cannot be in a single array of complex
numbers except for temporarily. I'm trying to avoid temporary storage,
though, because of the size of the files.

I'm currently reading the file scanline-by-scanline to extract rows of
complex numbers which I then loop over and load into the real/
imaginary arrays as follows:


        self._realData         = numpy.empty((Rows, Columns), dtype =
numpy.float32)
        self._imaginaryData = numpy.empty((Rows, Columns), dtype =
numpy.float32)

        floatData = array.array('f')

        for CurrentRow in range(Rows):

            floatData.fromfile(DataFH, (Columns*2))

            position = 0
            for CurrentColumn in range(Columns):

                 self._realData[CurrentRow, CurrentColumn]          =
floatData[position]
                self._imaginaryData[CurrentRow, CurrentColumn]  =
floatData[position+1]
                position = position + 2


The above code works but is much too slow. If I comment out the body
of the "for CurrentColumn in range(Columns)" loop, the performance is
perfectly adequate i.e. function call overhead associated with the
"fromfile(...)" call is not very bad at all. What seems to be most
time-consuming are the simple assignment statements in the
"CurrentColumn" for-loop.

Does anyone see any ways of speeding this up at all? Reading
everything into a complex64 ndarray in one fell swoop would certainly
be easier and faster, but at some point I'll need to split this array
into two parts (real / imaginary). I'd like to have that done
initially to keep the memory usage down since the files are so
ginormous.

Psyco is out because I need 64-bits, and I didn't see anything on the
forums regarding a method that reads in every other 32-bit chunk form
a file into an array. I'm not sure what else to try.

Thanks in advance.
L


From mensanator at aol.com  Thu Feb  5 17:29:50 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 5 Feb 2009 14:29:50 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8926.1233872413.3487.python-list@python.org>
Message-ID: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>

On Feb 5, 4:20?pm, Terry Reedy <tjre... at udel.edu> wrote:
> mk wrote:
>
> > (duck)
>
> > 542 comp.lang.python rtfm
>
> What is so unfriendly about 'read the fine manual'?

You've seen a fine manual?


From benjamin.kaplan at case.edu  Thu Feb  5 17:30:51 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 5 Feb 2009 17:30:51 -0500
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <498B5D42.6080408@shopzeus.com>
References: <mailman.8719.1233689579.3487.python-list@python.org>
	<gmc9ot$ops$1@online.de> <498B5D42.6080408@shopzeus.com>
Message-ID: <ec96e1390902051430g65fa618at80d34ff9c7427f1d@mail.gmail.com>

On Thu, Feb 5, 2009 at 4:42 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:

> Uwe Grauer ?rta:
>
>> Laszlo Nagy wrote:
>>
>>
>>> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
>>> FireBird 1.5?
>>>
>>> My problem:
>>>
>>>   * python 2.6 already installed on a server
>>>   * there is a firebird 1.5 database on the same server
>>>   * I need to access it from python 2.6
>>>
>>> Any thoughts?
>>>
>>>
>>>
>>>
>>
>> Get it from here:
>> http://www.firebirdsql.org/index.php?op=devel&sub=python
>>
>>
> Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can
> only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going to
> downgrade. :-(
>

The prebuilt binaries don't support Firebird 1.5. The installation guide
says that you can compile it from source to get 1.5 support.


>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From travis+ml-python at subspacefield.org  Thu Feb  5 17:40:36 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 5 Feb 2009 16:40:36 -0600
Subject: updating nntplib
Message-ID: <20090205224036.GH29170@subspacefield.org>

Hello all,

There are some notable deficiencies in nntlib.  Here are two:

1) It says it implements NNTP as defined in RFC 977, but NNTP
has a newer RFC, RFC 3977, which clarifies some vagueness and
has more commands defined.  However, as it currently stands you
cannot issue these commands, since they aren't available to
call.

2) In some cases, it will bomb out upon receiving certain greetings
that it doesn't expect.  As I understand it, it actually terminates
the connection, not allowing for catching an exception or anything.
I have not verified this myself.

I'd like to remedy these deficiencies.  In the case of #1, I'd
like to implement some of the new commands and provide a way to
send arbitrary commands to the server, because NNTP is designed
to allow servers to implement optional features.

I'm not sure how I'll remedy #2, but I imagine it will be clear
once I examine the code.

I am guessing that this is the right list for discussing this,
but perhaps python-dev is better.  Anyone have feedback?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From lionel.keene at gmail.com  Thu Feb  5 17:40:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:40:49 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
Message-ID: <44dc0091-1ea2-4636-952f-ee3ab4f33223@g1g2000pra.googlegroups.com>

On Feb 5, 2:22?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hello,
> I have data stored in binary files. Some of these files are
> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> numbers where the first 32 bits of the file is the real component, the
> second 32bits is the imaginary, the 3rd 32-bits is the real component
> of the second number, etc.
>
> I'd like to be able to read in just the real components, load them
> into a numpy.ndarray, then load the imaginary coponents and load them
> into a numpy.ndarray. ?I need the real and imaginary components stored
> in seperate arrays, they cannot be in a single array of complex
> numbers except for temporarily. I'm trying to avoid temporary storage,
> though, because of the size of the files.
>
> I'm currently reading the file scanline-by-scanline to extract rows of
> complex numbers which I then loop over and load into the real/
> imaginary arrays as follows:
>
> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> numpy.float32)
> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> numpy.float32)
>
> ? ? ? ? floatData = array.array('f')
>
> ? ? ? ? for CurrentRow in range(Rows):
>
> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
>
> ? ? ? ? ? ? position = 0
> ? ? ? ? ? ? for CurrentColumn in range(Columns):
>
> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> floatData[position]
> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> floatData[position+1]
> ? ? ? ? ? ? ? ? position = position + 2
>
> The above code works but is much too slow. If I comment out the body
> of the "for CurrentColumn in range(Columns)" loop, the performance is
> perfectly adequate i.e. function call overhead associated with the
> "fromfile(...)" call is not very bad at all. What seems to be most
> time-consuming are the simple assignment statements in the
> "CurrentColumn" for-loop.
>
> Does anyone see any ways of speeding this up at all? Reading
> everything into a complex64 ndarray in one fell swoop would certainly
> be easier and faster, but at some point I'll need to split this array
> into two parts (real / imaginary). I'd like to have that done
> initially to keep the memory usage down since the files are so
> ginormous.
>
> Psyco is out because I need 64-bits, and I didn't see anything on the
> forums regarding a method that reads in every other 32-bit chunk form
> a file into an array. I'm not sure what else to try.
>
> Thanks in advance.
> L

Hmmm...I've just discovered "weave.inline()". Maybe I'll just do the
assignments in C.

Still soliciting advice, of course. :-)


From david at boddie.org.uk  Thu Feb  5 17:45:12 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 05 Feb 2009 23:45:12 +0100
Subject: HOWTO for setting up a PyQt project in Eclipse ?
References: <mailman.8907.1233854493.3487.python-list@python.org>
Message-ID: <gmfq5o$1ps$1@get-news01.get.basefarm.net>

On Thursday 05 February 2009 18:13, Linuxguy123 wrote:

> Does anyone know of a HOWTO for setting up a PyQt project in Eclipse ?
> 
> I know about setting up a PyDev project, just wondering how to integrate
> the QtDesigner parts.
> 
> For example, should I save the QtDesigner project in the root PyDev
> directory ?

I'm not an Eclipse user, but I recently noticed that the Python(x,y)
project uses (or at least refers to) both PyQt and PyDev. Maybe there's
some useful information, or useful starting points, on these pages:

  http://pythonxy.com/help.php
  http://pythonxy.com/discussions.php

David


From steve at holdenweb.com  Thu Feb  5 17:46:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 17:46:19 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <gmfq7t$77u$1@ger.gmane.org>

Mensanator wrote:
> On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>>> (duck)
>>> 542 comp.lang.python rtfm
>> What is so unfriendly about 'read the fine manual'?
> 
> You've seen a fine manual?

Yes, and I'm fine well sure this is somewhere between a silly thread and
a troll.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb  5 17:48:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 22:48:49 +0000
Subject: Skipping bytes while reading a binary file?
In-Reply-To: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
Message-ID: <498B6CD1.30700@mrabarnett.plus.com>

Lionel wrote:
 > Hello,
 > I have data stored in binary files. Some of these files are
 > huge...upwards of 2 gigs or more. They consist of 32-bit float complex
 > numbers where the first 32 bits of the file is the real component, the
 > second 32bits is the imaginary, the 3rd 32-bits is the real component
 > of the second number, etc.
 >
 > I'd like to be able to read in just the real components, load them
 > into a numpy.ndarray, then load the imaginary coponents and load them
 > into a numpy.ndarray.  I need the real and imaginary components stored
 > in seperate arrays, they cannot be in a single array of complex
 > numbers except for temporarily. I'm trying to avoid temporary storage,
 > though, because of the size of the files.
 >
 > I'm currently reading the file scanline-by-scanline to extract rows of
 > complex numbers which I then loop over and load into the real/
 > imaginary arrays as follows:
 >
 >
 >         self._realData         = numpy.empty((Rows, Columns), dtype =
 > numpy.float32)
 >         self._imaginaryData = numpy.empty((Rows, Columns), dtype =
 > numpy.float32)
 >
 >         floatData = array.array('f')
 >
 >         for CurrentRow in range(Rows):
 >
 >             floatData.fromfile(DataFH, (Columns*2))
 >
 >             position = 0
 >             for CurrentColumn in range(Columns):
 >
 >                  self._realData[CurrentRow, CurrentColumn]          =
 > floatData[position]
 >                 self._imaginaryData[CurrentRow, CurrentColumn]  =
 > floatData[position+1]
 >                 position = position + 2
 >
 >
 > The above code works but is much too slow. If I comment out the body
 > of the "for CurrentColumn in range(Columns)" loop, the performance is
 > perfectly adequate i.e. function call overhead associated with the
 > "fromfile(...)" call is not very bad at all. What seems to be most
 > time-consuming are the simple assignment statements in the
 > "CurrentColumn" for-loop.
 >
[snip]
Try array slicing. floatData[0::2] will return the real parts and
floatData[1::2] will return the imaginary parts. You'll have to read up 
how to assign to a slice of the numpy array (it might be 
"self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow, 
:] = real_parts").

BTW, it's not the function call overhead of fromfile() which takes the
time, but actually reading data from the file.



From lionel.keene at gmail.com  Thu Feb  5 17:56:28 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:56:28 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
Message-ID: <695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>

On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> Hello,
> ?> I have data stored in binary files. Some of these files are
> ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> ?> numbers where the first 32 bits of the file is the real component, the
> ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> ?> of the second number, etc.
> ?>
> ?> I'd like to be able to read in just the real components, load them
> ?> into a numpy.ndarray, then load the imaginary coponents and load them
> ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> ?> in seperate arrays, they cannot be in a single array of complex
> ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> ?> though, because of the size of the files.
> ?>
> ?> I'm currently reading the file scanline-by-scanline to extract rows of
> ?> complex numbers which I then loop over and load into the real/
> ?> imaginary arrays as follows:
> ?>
> ?>
> ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> ?> numpy.float32)
> ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> ?> numpy.float32)
> ?>
> ?> ? ? ? ? floatData = array.array('f')
> ?>
> ?> ? ? ? ? for CurrentRow in range(Rows):
> ?>
> ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> ?>
> ?> ? ? ? ? ? ? position = 0
> ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> ?>
> ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> ?> floatData[position]
> ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> ?> floatData[position+1]
> ?> ? ? ? ? ? ? ? ? position = position + 2
> ?>
> ?>
> ?> The above code works but is much too slow. If I comment out the body
> ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> ?> perfectly adequate i.e. function call overhead associated with the
> ?> "fromfile(...)" call is not very bad at all. What seems to be most
> ?> time-consuming are the simple assignment statements in the
> ?> "CurrentColumn" for-loop.
> ?>
> [snip]
> Try array slicing. floatData[0::2] will return the real parts and
> floatData[1::2] will return the imaginary parts. You'll have to read up
> how to assign to a slice of the numpy array (it might be
> "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> :] = real_parts").
>
> BTW, it's not the function call overhead of fromfile() which takes the
> time, but actually reading data from the file.

Very nice! I like that! I'll post the improvement (if any).

L


From prologic at shortcircuit.net.au  Thu Feb  5 18:16:47 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 09:16:47 +1000
Subject: Is the subprocess module robust enough in 2.4?
In-Reply-To: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>
References: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>
Message-ID: <e1a84d570902051516i69a3b2b7uea919df7efe46413@mail.gmail.com>

On Fri, Feb 6, 2009 at 2:20 AM,  <skip at pobox.com> wrote:
> The subprocess module was added in Python 2.4.  I'm running 2.4.5 at work.
> I know it's seen many bugfixes since first released.  Is the version in 2.4
> robust enough to use in preference to os.popen and friends?

"Is xxx rubust enough" is an untangible question.
What you really -should- be doing is looking at the
bug reports (as you've mentioned) and determine whether
or not they will affect your use-case(s) in any way.

cheers
James


From aahz at pythoncraft.com  Thu Feb  5 18:27:46 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 Feb 2009 15:27:46 -0800
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
Message-ID: <gmfsli$dgd$1@panix3.panix.com>

In article <6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
andrew cooke  <andrew at acooke.org> wrote:
>On Feb 1, 8:45=A0pm, a... at pythoncraft.com (Aahz) wrote:
>>
>> [...]=A0I for one won't participate in any list hosted on
>> Google because of the need for a Google login.
>
>hi,  just fyi, i investigated this and you can join any publicly
>readable group by sending an email to the "-subscribe" address.  you
>do not need a google login for this and, as far as i can tell, it then
>operates for you like a normal mailing list.
>
>for example, to subscribe to the group foo, you would send an email to
>foo-subscribe at googlegroups.com.  to unsubscribe, use foo-
>unsubscribe at googlegroups.com.
>
>this isn't exactly well-publicised, but i tested it and it does work.

The same thing is theoretically true for Yahoo groups, but I've heard
from people over the years about various difficulties fixing problems
with list subscriptions in the absence of a real Yahoo login and I'm not
particularly interested in finding out that the same thing ends up being
true for Google lists.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From lionel.keene at gmail.com  Thu Feb  5 18:35:22 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 15:35:22 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
Message-ID: <4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com>

On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
>
>
>
>
> > Lionel wrote:
>
> > ?> Hello,
> > ?> I have data stored in binary files. Some of these files are
> > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > ?> numbers where the first 32 bits of the file is the real component, the
> > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > ?> of the second number, etc.
> > ?>
> > ?> I'd like to be able to read in just the real components, load them
> > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > ?> in seperate arrays, they cannot be in a single array of complex
> > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > ?> though, because of the size of the files.
> > ?>
> > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > ?> complex numbers which I then loop over and load into the real/
> > ?> imaginary arrays as follows:
> > ?>
> > ?>
> > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > ?> numpy.float32)
> > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > ?> numpy.float32)
> > ?>
> > ?> ? ? ? ? floatData = array.array('f')
> > ?>
> > ?> ? ? ? ? for CurrentRow in range(Rows):
> > ?>
> > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > ?>
> > ?> ? ? ? ? ? ? position = 0
> > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > ?>
> > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > ?> floatData[position]
> > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > ?> floatData[position+1]
> > ?> ? ? ? ? ? ? ? ? position = position + 2
> > ?>
> > ?>
> > ?> The above code works but is much too slow. If I comment out the body
> > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > ?> perfectly adequate i.e. function call overhead associated with the
> > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > ?> time-consuming are the simple assignment statements in the
> > ?> "CurrentColumn" for-loop.
> > ?>
> > [snip]
> > Try array slicing. floatData[0::2] will return the real parts and
> > floatData[1::2] will return the imaginary parts. You'll have to read up
> > how to assign to a slice of the numpy array (it might be
> > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > :] = real_parts").
>
> > BTW, it's not the function call overhead of fromfile() which takes the
> > time, but actually reading data from the file.
>
> Very nice! I like that! I'll post the improvement (if any).
>
> L- Hide quoted text -
>
> - Show quoted text -


Okay, the following:

            self._realData[CurrentRow]      = floatData[0::2]
            self._imaginaryData[CurrentRow] = floatData[1::2]

gives a 3.5x improvement in execution speed over the original that I
posted. That's much better. Thank you for the suggestion.

L


From travis+ml-python at subspacefield.org  Thu Feb  5 18:38:26 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 5 Feb 2009 17:38:26 -0600
Subject: updating nntplib
In-Reply-To: <20090205224036.GH29170@subspacefield.org>
References: <20090205224036.GH29170@subspacefield.org>
Message-ID: <20090205233826.GI29170@subspacefield.org>

On Thu, Feb 05, 2009 at 04:40:36PM -0600, Travis wrote:
> 2) In some cases, it will bomb out upon receiving certain greetings
> that it doesn't expect.  As I understand it, it actually terminates
> the connection, not allowing for catching an exception or anything.
> I have not verified this myself.

I just verified this; if the server responds to authentication with
the string "200 Welcome feeder", then nntplib bombs out with a:

nntplib.NNTPPermanentError

IMHO, it shouldn't be sensitive to anything but the numeric code,
and 200 indicates success.
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From bthate at gmail.com  Thu Feb  5 18:50:50 2009
From: bthate at gmail.com (Bart Thate)
Date: Thu, 5 Feb 2009 15:50:50 -0800 (PST)
Subject: GOZERBOT 0.9 RELEASED
Message-ID: <4128ec68-e489-4236-8930-45a196244e3c@p36g2000prp.googlegroups.com>

Finally gozerbot 0.9 has been released.  This is a huge step forward
to version 1.0 and contains a number of changes:

    * use json as the format to save data in instead of pickles
    * let config files also use json, this makes them more readable
and human editable
    * remove popen usage from the bot core
    * remove execfile() calls from the bot core
    * rewrite the gozerbot package into several subpackages
    * use sqlaclhemy to provide database backend (sqlite3 is default)
    * require python2.5
    * move most of the plugins into their own package
    * restructure the gozerdata layout so its more readable

All these changes makes upgrading from older versions of gozerbot
necessary so a gozerbot-upgrade program is provided (upgrading from
0.7 is not supported yet, will follow soon).

See http://gozerbot.org on how to install gozerbot 0.9

About GOZERBOT:

0.9 Requirements

    * a shell
    * python 2.5 or higher
    * gnupg
    * simplejson
    * sqlalchemy
    * xmpppy

Why gozerbot?

    * provide both IRC and Jabber support
    * user management by userhost .. bot will not respond if it
doesn't know you (see USER)
    * fleet .. use more than one bot in a program (list of bots) (see
FLEET)
    * use the bot through dcc chat
    * fetch rss feeds (see RSS)
    * remember items
    * relaying between bots (see RELAY)
    * program your own plugins (see PROGRAMPLUGIN)
    * query other bots with json REST (see CLOUD)
    * serve as a udp <-> irc or jabber notification bot (see UDP
    * sqlalchemy support

Bart


From lionel.keene at gmail.com  Thu Feb  5 18:51:07 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 15:51:07 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com>
Message-ID: <471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>

On Feb 5, 3:35?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > > Lionel wrote:
>
> > > ?> Hello,
> > > ?> I have data stored in binary files. Some of these files are
> > > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > > ?> numbers where the first 32 bits of the file is the real component, the
> > > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > > ?> of the second number, etc.
> > > ?>
> > > ?> I'd like to be able to read in just the real components, load them
> > > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > > ?> in seperate arrays, they cannot be in a single array of complex
> > > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > > ?> though, because of the size of the files.
> > > ?>
> > > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > > ?> complex numbers which I then loop over and load into the real/
> > > ?> imaginary arrays as follows:
> > > ?>
> > > ?>
> > > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > > ?> numpy.float32)
> > > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > > ?> numpy.float32)
> > > ?>
> > > ?> ? ? ? ? floatData = array.array('f')
> > > ?>
> > > ?> ? ? ? ? for CurrentRow in range(Rows):
> > > ?>
> > > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > > ?>
> > > ?> ? ? ? ? ? ? position = 0
> > > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > > ?>
> > > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > > ?> floatData[position]
> > > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > > ?> floatData[position+1]
> > > ?> ? ? ? ? ? ? ? ? position = position + 2
> > > ?>
> > > ?>
> > > ?> The above code works but is much too slow. If I comment out the body
> > > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > > ?> perfectly adequate i.e. function call overhead associated with the
> > > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > > ?> time-consuming are the simple assignment statements in the
> > > ?> "CurrentColumn" for-loop.
> > > ?>
> > > [snip]
> > > Try array slicing. floatData[0::2] will return the real parts and
> > > floatData[1::2] will return the imaginary parts. You'll have to read up
> > > how to assign to a slice of the numpy array (it might be
> > > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > > :] = real_parts").
>
> > > BTW, it's not the function call overhead of fromfile() which takes the
> > > time, but actually reading data from the file.
>
> > Very nice! I like that! I'll post the improvement (if any).
>
> > L- Hide quoted text -
>
> > - Show quoted text -
>
> Okay, the following:
>
> ? ? ? ? ? ? self._realData[CurrentRow] ? ? ?= floatData[0::2]
> ? ? ? ? ? ? self._imaginaryData[CurrentRow] = floatData[1::2]
>
> gives a 3.5x improvement in execution speed over the original that I
> posted. That's much better. Thank you for the suggestion.
>
> L- Hide quoted text -
>
> - Show quoted text -

Correction: improvement is around 7-8x.


From tjreedy at udel.edu  Thu Feb  5 19:07:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 19:07:02 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <gmfuv0$ln4$1@ger.gmane.org>

Mensanator wrote:
> On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>>> (duck)
>>> 542 comp.lang.python rtfm
>> What is so unfriendly about 'read the fine manual'?
> 
> You've seen a fine manual?

Yes, and I and others have spent hours and hours making the Python 
manuals finer.



From orlenko at gmail.com  Thu Feb  5 19:37:18 2009
From: orlenko at gmail.com (Volodya)
Date: Thu, 5 Feb 2009 16:37:18 -0800 (PST)
Subject: Using multiprocessing from a Windows service
Message-ID: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>

Hi all,

I think I've found a small bug with multiprocessing package on
Windows. If you try to start a multiprocessing.Process from a Python-
based Windows service, the child process will fail to run. When
running the parent process as a regular Python program, everything
works as expected.

I've tracked the problem down to how main_path is prepared in
multiprocessing.forking.get_preparation_data() (lines 370-377):

def get_preparation_data(name):
    [...skipped a few lines...]
    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            d['main_path'] = os.path.normpath(main_path)
    return d

When the program is running as a Windows service, but is not packaged
into a single executable, main_path will become the path to the
service executable (typically, pythonservice.exe). When this data
makes it to the child process, the prepare() function will treat
main_path as a path to a python module, and will try to import it.
This causes it to fail.

My quick-and-dirty solution was to check in get_preparation_data() if
main_path ends with '.exe', and if it does, to not pass it at all.
This solves the problem in my case, but perhaps there's a better way
to fix this? Here is my version of get_preparation_data():

def get_preparation_data(name):
    '''
    Return info about parent needed by child to unpickle process
object
    '''
    from .util import _logger, _log_to_stderr

    d = dict(
        name=name,
        sys_path=sys.path,
        sys_argv=sys.argv,
        log_to_stderr=_log_to_stderr,
        orig_dir=process.ORIGINAL_DIR,
        authkey=process.current_process().authkey,
        )

    if _logger is not None:
        d['log_level'] = _logger.getEffectiveLevel()

    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            if not main_path.endswith('.exe'):
                d['main_path'] = os.path.normpath(main_path)

    return d




From matzke at berkeley.edu  Thu Feb  5 19:48:09 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 16:48:09 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <6v126hFhj1beU1@mid.uni-berlin.de>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>	<mailman.8921.1233865754.3487.python-list@python.org>
	<6v126hFhj1beU1@mid.uni-berlin.de>
Message-ID: <498B88C9.4010602@berkeley.edu>

OK, so the problem was that I had to exit ipython, re-enter it, and then 
import my module to get the errors to disappear.  Thanks for the help!

(PS: Is there a way to force a complete reload of a module, without 
exiting ipython?  Just doing the import command again doesn't seem to do 
it.)

Thanks!
Nick


Diez B. Roggisch wrote:
> Nick Matzke schrieb:
>>
>>
>> Scott David Daniels wrote:
>>> M.-A. Lemburg wrote:
>>>> On 2009-02-05 10:08, Nick Matzke wrote:
>>>>> ..., I can run this in the ipython shell just fine:
>>>>> a = ["12", "15", "16", "38.2"]
>>>>> dim = int(sqrt(size(a)))
>>>>> ...But if I move these commands to a function in another file, it 
>>>>> freaks out:
>>>> You need to add:
>>>>
>>>> from math import sqrt
>>> or:
>>>     from cmath import sqrt
>>> or:
>>>     from numpy import sqrt
>>
>>
>>
>>
>>
>> The weird thing is, when I do this, I still get the error:
>>
>> ============
>> nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
>> nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
>> make_half_square_array
>> nick at mws2[phylocom]|24> d = make_half_square_array(a)
>> --------------------------------------------------------------------------- 
>>
>> NameError                                 Traceback (most recent call 
>> last)
>>
>> /bioinformatics/phylocom/<ipython console> in <module>()
>>
>> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
>> make_half_square_array(linear_version_of_square_array)
>>    1548         from numpy import sqrt
>>    1549         a = linear_version_of_square_array
>> -> 1550         dim = int(sqrt(size(a)))
>>    1551
>>    1552
>>
>> NameError: global name 'sqrt' is not defined
>> nick at mws2[phylocom]|25>
>> ============
>>
>> Is there some other place I should put the import command?  I.e.:
>> 1. In the main script/ipython command line
>>
>> 2. In the called function, i.e. make_half_square_array() in 
>> LR_run_functions_v2.py
>>
>> 3. At the top of LR_run_functions_v2.py, outside of the individual 
>> functions?
> 
> The latter. Python's imports are always local to the module/file they 
> are in, not globally effective.
> 
> 
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From skippy.hammond at gmail.com  Thu Feb  5 19:48:45 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 11:48:45 +1100
Subject: subprocess returncode windows
In-Reply-To: <851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>	<mailman.5728.1229453705.3487.python-list@python.org>	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
Message-ID: <498B88ED.3060100@gmail.com>

On 6/02/2009 6:34 AM, Andrew wrote:
> Notice how python never gets the correct returncode from asadmin.bat
> but I can get the correct returncode from the shell every time. Can
> anyone tell me why Python wouldn't be able to get the correct
> returncode for asadmin?

I think the problem will be that cmd.exe doesn't return the exit code to 
*its* caller correctly.  You can often work around this by avoiding the 
use of cmd.exe to spawn the child process, but obviously you do need it 
with a .bat file.  I'm not aware of an easy work-around.

Cheers,

Mark


From bignose+hates-spam at benfinney.id.au  Thu Feb  5 19:55:17 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Fri, 06 Feb 2009 11:55:17 +1100
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com>
Message-ID: <87bptgxu2y.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
> andrew cooke  <andrew at acooke.org> wrote:
> >hi, just fyi, i investigated this and you can join any publicly
> >readable group by sending an email to the "-subscribe" address. you
> >do not need a google login for this and, as far as i can tell, it
> >then operates for you like a normal mailing list.
> 
> The same thing is theoretically true for Yahoo groups, but I've
> heard from people over the years about various difficulties fixing
> problems with list subscriptions in the absence of a real Yahoo
> login and I'm not particularly interested in finding out that the
> same thing ends up being true for Google lists.

Indeed it does. I have succeeded in subscribing to Google mailing
lists in the absence of a Google account, but *managing* that
subscription thereafter in the absence of a Google account is
obnoxiously difficult. Your caution is well advised.

-- 
 \                ?I got fired from my job the other day. They said my |
  `\          personality was weird. ? That's okay, I have four more.? |
_o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
Ben Finney


From prologic at shortcircuit.net.au  Thu Feb  5 19:55:19 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 10:55:19 +1000
Subject: global name 'sqrt' is not defined
In-Reply-To: <498B88C9.4010602@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
	<mailman.8865.1233835298.3487.python-list@python.org>
	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
	<mailman.8921.1233865754.3487.python-list@python.org>
	<6v126hFhj1beU1@mid.uni-berlin.de> <498B88C9.4010602@berkeley.edu>
Message-ID: <e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:48 AM, Nick Matzke <matzke at berkeley.edu> wrote:
> (PS: Is there a way to force a complete reload of a module, without exiting
> ipython?  Just doing the import command again doesn't seem to do it.)

m = __import__("mymobile")
reload(m)

cheers
James


From rhodri at wildebst.demon.co.uk  Thu Feb  5 19:57:05 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 00:57:05 -0000
Subject: where clause
In-Reply-To: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
Message-ID: <op.uownlfkma8ncjz@gnudebst>

On Thu, 05 Feb 2009 18:04:35 -0000, <bearophileHUGS at lycos.com> wrote:

> p = a / b
>   where
>     a = 20 / len(c)
>     b = foo(d)

You'd want to do it with paired keywords, in the manner of try/except,
to avoid utterly breaking Python's syntax conventions.  Perhaps
something like this:

do:
   p = a / b
where:
   a = 20 / len(c)
   b = foo(d)

or even:

where:
   a = 20 / len(c)
   b = foo(d)
do:
   p = a / b


Effectively you're creating a little local namespace for temporary
variables.  I'm not sure it buys you a lot, even as sugar, and I'm
really not convinced by the bypartite form, but it's definitely
possible.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From robert.kern at gmail.com  Thu Feb  5 20:01:14 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 05 Feb 2009 19:01:14 -0600
Subject: global name 'sqrt' is not defined
In-Reply-To: <e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>	<mailman.8921.1233865754.3487.python-list@python.org>	<6v126hFhj1beU1@mid.uni-berlin.de>
	<498B88C9.4010602@berkeley.edu>
	<e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>
Message-ID: <gmg24r$tk7$1@ger.gmane.org>

On 2009-02-05 18:55, James Mills wrote:
> On Fri, Feb 6, 2009 at 10:48 AM, Nick Matzke<matzke at berkeley.edu>  wrote:
>> (PS: Is there a way to force a complete reload of a module, without exiting
>> ipython?  Just doing the import command again doesn't seem to do it.)
>
> m = __import__("mymobile")
> reload(m)

Or more straightforwardly:

   import mymobile
   reload(mymobile)

If you have done

   from mymobile import *

anywhere, you will need to re-execute that line again.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From rhodri at wildebst.demon.co.uk  Thu Feb  5 20:03:56 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 01:03:56 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
	<op.uouyd20ma8ncjz@gnudebst>
	<77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>
Message-ID: <op.uownwuuea8ncjz@gnudebst>

On Thu, 05 Feb 2009 03:32:59 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> "The problem is you seem to be thinking in terms of objects having names.
> They don't.  Names have objects."I agree this is my problem. This is not
> correct terminology then?
> The name of the object is anobject

No.  The name of the object is a name.  It doesn't really exist as an
object at all.

As others have said, if you really want this information you'll need to
write your own class with a "name" attribute, and assign a suitable string
to it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From conradwt at gmail.com  Thu Feb  5 20:29:29 2009
From: conradwt at gmail.com (Con)
Date: Thu, 5 Feb 2009 17:29:29 -0800 (PST)
Subject: MacPython 3.0 dmg installer?
Message-ID: <ddd15a49-9dee-44e5-b542-f08adbe4bdb4@r15g2000prh.googlegroups.com>

Hi, I was wondering, what's the status of the MacPython 3.0 installer
(.i.e. dmg file) ?  I have been using the previous MacPython dmg
installers with great success  without conflicting with other
installations on the system.

Thanks in advance,

-Conrad




From todpose at hotmail.com  Thu Feb  5 20:43:30 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Thu, 5 Feb 2009 17:43:30 -0800
Subject: Converting numbers to words
Message-ID: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>


I've been trying to figure this out for over 2 hours and I'm really frustrated right now.I first made Python to ask user to input height in meters. If user puts certain value in meter, then it converts it to feet and inches as follows: 
Enter the height (in metres): 1.6It is 5 feet, 3 inches high.  What I want to do is to make it type only words. For example, instead of its saying, "It is 5 feet, 3 inches high," I want it to say, "it is five feet, three inches high."I'd appreciate any suggestions.
_________________________________________________________________
Twice the fun?Share photos while you chat with Windows Live Messenger.
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From aaron.watters at gmail.com  Thu Feb  5 20:53:52 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Thu, 5 Feb 2009 17:53:52 -0800 (PST)
Subject: ANN: Nucular full text indexing 0.4
Message-ID: <1eb08437-e2d2-4938-95ed-8ee4930e598c@g1g2000pra.googlegroups.com>

ANNOUNCING NUCULAR 0.4
======================

This release adds a simple "table space" wrapper
which makes Nucular easier to use for some
purposes.  It also fixes a number of bugs.

WHERE IS IT?

Find documentation and downloads at

  http://nucular.sourceforge.net/

WHAT IS IT?

Nucular is a system for creating full text
indices for fielded data. It can be accessed
via a Python API or via a suite of command
line interfaces.

Nucular archives fielded documents and
retrieves them based on field value, field
prefix, field word prefix, or full text
word prefix, word proximity or combinations
of these. Nucular also includes features
for determining values related to a query
often called query facets.

FEATURES

    * Nucular is very light weight.
Updates and accesses do not require
any server process or other system
support such as shared memory locking.

    * Nucular supports concurrency.
Arbitrary concurrent updates and
accesses by multiple processes or
threads are supported, with no
possible locking issues.

    * Nucular indexes and retrieves
data quickly.

    * Nucular has a funny name.

NOTES

The file storage format for this release is
not compatible with older formats (the change
was needed to fix a bug).

On Windows XP I had to delete the old
package manually from the Python library
before the install for the new package
would work properly.

I hope you like it.

   -- Aaron Watters

===
Fear has several advantages over gratitude.
Gratitude is intrinsically limited,
if only by the finite creative capacity of
the scientific community. Moreover, as
pointed out by a colleague at MIT, appealing
to people?s gratitude and trust is usually
less effective than pulling a gun.
  -- Richard Lindzen


From ianare at gmail.com  Thu Feb  5 21:34:05 2009
From: ianare at gmail.com (=?ISO-8859-1?B?aWFuYXLp?=)
Date: Thu, 5 Feb 2009 18:34:05 -0800 (PST)
Subject: sorting for recursive folder rename
References: <e385ba1f-cb8c-42eb-9095-2e4b4ad1ae95@e24g2000vbe.googlegroups.com>
	<mailman.5748.1229474227.3487.python-list@python.org>
Message-ID: <d90cb283-c35f-4f5e-b04e-0396a6c66ffc@b38g2000prf.googlegroups.com>

On Dec 16 2008, 7:36?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Tue, 16 Dec 2008 18:20:52 -0000, ianar? <ian... at gmail.com> wrote:
> > Hello all,
>
> > I trying to recursivelyrenamefolders and files, and am looking for
> > some ideas on the best way of doing this. The problem is that the
> > given list of items can be in order, and one to all items may be
> > renamed. Here is some preliminary code I have, but which does not work
> > very well.

self.toRename has the following structure :
[
[original_name, new_name, os.path.isdir]
..
]

# define these here for faster processing
def split(item):
    return os.path.split(item)
def addSep(path):
    return os.sep + path + os.sep
def recursiveFolderSort(x,y):
    return cmp(y[0], x[0])

sortedRename = sorted(self.toRename)

# make a list of all folders that will be processed
foldersToAdjust = []
for item in sortedRename:
    if item[2] is False:
        oF = split(item[0])[1] # original folder name
        nF = split(item[1])[1] # new folder name
        if oF is not nF:
            foldersToAdjust.append((oF, nF))

# replace all occurences of folders in path
for i in range(len(self.toRename)):
    for f in foldersToAdjust:
        oF = addSep(f[0]) # original folder name
        nF = addSep(f[1]) # new folder name
        self.toRename[i][0] = self.toRename[i][0].replace(oF,nF)
        self.toRename[i][1] = self.toRename[i][1].replace(oF,nF)

    if progressDialog.update(i) is False:
        error = 'cancelled'
        break

# make sure renaming will be in correct order !
self.toRename.sort(recursiveFolderSort)

> import os
>
> for item in self.toRename:
> ? ? ?os.renames(item[0], item[1])
>
> That's it. ?os.renames will take care of all the intermediate
> directory creation so you don't even need to sort the list.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

It's been a while since I decided to work on this again ...

Anyway, if only it were that easy !!

Traceback (most recent call last):
  File "/home/ianare/Desktop/file-folder-ren/metamorphose2/Source/
MainWindow.py", line 1477, in renameItems
    os.renames(original[0], renamed[0])
  File "/usr/lib/python2.5/os.py", line 213, in renames
    rename(old, new)
OSError: [Errno 2] No such file or directory


The problem is that if a directory is changed, all lower instances
need to be changed as well.

given the following directory structure ...

recursive
|
|_1
|  |_1
|  |  |_1.txt
|  |  |_2.txt
|  |_2
|     |_1.txt
|     |_2.txt
|_2
   |_1
   |  |_1.txt
   |  |_2.txt
   |_2
      |_1.txt
      |_2.txt

... and assuming I want to change :
recursive/2/2/2.txt  -->  recursive/2/2/14.txt

but, I ALSO want to change :
recursive/2  -->  recursive/04

it means that the first operation is really :
recursive/04/2/2.txt  -->  recursive/04/2/14.txt

os.renames will work, but it needs to have the correct path, so it
comes down to the same thing.

IOW, I need a way of :
A) adjusting paths taking into consideration all changes up and down
the tree
B) sorting normalized paths so they are renamed in the proper sequence
(depends on point 'A', obviously)

I'm pretty sure I can take care of 'B' with the following sorting
method:

# order by path depth
def recursiveFolderSort(x, y):
    x = x[0].count(os.sep)
    y = y[0].count(os.sep)
    return cmp(x, y)
self.toRename.sort(recursiveFolderSort)

but I still need a way of generating the correct names.

Solution finder will have his/her name placed on the credits page.
http://file-folder-ren.sourceforge.net/index.php?page=Links

Thanks in advance !!


From benjamin at python.org  Thu Feb  5 21:41:21 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 6 Feb 2009 02:41:21 +0000 (UTC)
Subject: MacPython 3.0 dmg installer?
References: <ddd15a49-9dee-44e5-b542-f08adbe4bdb4@r15g2000prh.googlegroups.com>
Message-ID: <loom.20090206T024034-117@post.gmane.org>

Con <conradwt <at> gmail.com> writes:

> 
> Hi, I was wondering, what's the status of the MacPython 3.0 installer
> (.i.e. dmg file) ?  I have been using the previous MacPython dmg
> installers with great success  without conflicting with other
> installations on the system.

There should be ones for 3.0.1 which is coming out within the next few weeks.






From steve at holdenweb.com  Thu Feb  5 21:42:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 21:42:25 -0500
Subject: Converting numbers to words
In-Reply-To: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
References: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
Message-ID: <gmg82i$bd8$1@ger.gmane.org>

todpose at hotmail.com wrote:
> I've been trying to figure this out for over 2 hours and I'm really
> frustrated right now.
> 
> I first made Python to ask user to input height in meters. If user puts
> certain value in meter, then it converts it to feet and inches as follows:
>  
> 
> Enter the height (in metres): 1.6
> 
> It is 5 feet, 3 inches high.
>  
>  
> What I want to do is to make it type only words. For example, instead of
> its saying, "It is 5 feet, 3 inches high," I want it to say, "it is five
> feet, three inches high."
> I'd appreciate any suggestions.

Create a list or tuple of strings, and use the numbers to index the list.

lst = ['a', 'b', 'c']
ndx = 1
print "The letter", lst[ndx], "is number one"

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From benjamin at python.org  Thu Feb  5 21:44:20 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 6 Feb 2009 02:44:20 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>	<gmf0c4$eq$1@ger.gmane.org>
	<498B0F8B.8090109@aim.com> <gmf45k$h3p$1@ger.gmane.org>
Message-ID: <loom.20090206T024251-569@post.gmane.org>

mk <mrkafk <at> gmail.com> writes:
> Hmm, I'm surprised by even that! Apparently list creation is more 
> expensive than I thought - it seems somewhat more expensive than the 
> cost of interpreting bytecode for "if var is None". Either list creation 
> is somewhat costly, or "if var is None" is really cheap.

Creating a list requires several function calls on the C level (including the
dictionary lookup for the name "list") and memory allocation, which is usually
quite expensive. In contrast, the eval loop for "is None" basically uses a
pointer comparison.






From vincent at vincentdavis.net  Thu Feb  5 22:03:01 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 5 Feb 2009 20:03:01 -0700
Subject: return multiple objects
Message-ID: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>

Is it correct that if I want to return multiple objects from a function I
need to in some way combine them?
def test1():
    a = [1,3,5,7]
    b = [2,4,6,8]
    c=[a,b]
   return a, b # this does not work?
   return [a, b] # does not work?
   return c # this works but I don't like it, , is there a better way?

I saw examples where dictionaries where used but I would prefer to
just access the object names directly. As in

test1()
print a # not haing to refer to it as

is there something I am missing?


Thanks
Vincent Davis
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From clp2 at rebertia.com  Thu Feb  5 22:06:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 19:06:55 -0800
Subject: return multiple objects
In-Reply-To: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
Message-ID: <50697b2c0902051906r30bf26ck2ce914cf74e7aa88@mail.gmail.com>

On Thu, Feb 5, 2009 at 7:03 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Is it correct that if I want to return multiple objects from a function I
> need to in some way combine them?
> def test1():
>     a = [1,3,5,7]
>     b = [2,4,6,8]
>     c=[a,b]
>    return a, b # this does not work?
>    return [a, b] # does not work?
>    return c # this works but I don't like it, , is there a better way?

All 3 of those *do work* just fine.
I suspect you happen to not be familiar with how to retrieve the
multiple results.

Here's how:

q, w = test1()
print q # prints [1,3,5,7]
print w # prints [2,4,6,8]

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Thu Feb  5 22:17:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 06 Feb 2009 01:17:01 -0200
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
Message-ID: <op.uowt2ni5x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 05 Feb 2009 17:34:29 -0200, Andrew <andrew.replogle at gmail.com>  
escribi?:

> On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
>> escribi?:
>>
>>
>>
>> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
>> >> Andrew schrieb:
>>
>> >> > I'm running into a strange situation with getting incorrect
>> >> > returncodes / exit status from python subprocess.call. I'm using a
>> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
>> >> > java applications to glassfish application server. Below is an >>  
>> > example

> I've tried this several ways now. It seems to be something specific
> with python and asadmin.bat.
>
> I've tried the following manually in the cmd.exe prompt:

[examples showing %ERRORLEVEL% correctly set when running from the command  
line, but subprocess.call doesn't get it]

> Notice how python never gets the correct returncode from asadmin.bat
> but I can get the correct returncode from the shell every time. Can
> anyone tell me why Python wouldn't be able to get the correct
> returncode for asadmin?

The last exit code set by a command *should* propagate as the exit code of  
the whole .bat, then as the exit code of the cmd.exe instance that runs  
it, and finally Python *should* receive that value. Some old Windows  
versions didn't behave like that, but AFAIK XP does the right thing here.
Unless asadmin.bat is playing tricks with %ERRORLEVEL% or something.
Can you post the contents of asadmin.bat?

Without looking into it, I can think of a few alternatives:

- rewrite asadmin.bat in Python, if feasible. Some scripts just check/set  
a few environment variables and execute some process at the end, and  
that's all; in this case it should be easy to emulate the same thing in  
Python.

- try using another layer of your own, e.g., my_asadmin.bat:

call asadmin.bat %*
exit /b %ERRORLEVEL%

- variation: write the exit code somewhere:

call asadmin.bat %*
echo %ERRORLEVEL% > asadmin.err

and read asadmin.err from Python. (I've used something like this in a  
chain Win32 process --> 16 bits GUI application --> .bat script --> old  
DOS executable)

-- 
Gabriel Genellina



From BrianVanderburg2 at aim.com  Thu Feb  5 22:20:35 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 22:20:35 -0500
Subject: Converting numbers to words
In-Reply-To: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
References: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
Message-ID: <498BAC83.8090403@aim.com>

todpose at hotmail.com wrote:
 >
 > I've been trying to figure this out for over 2 hours and I'm really 
frustrated right now.
 >
 > I first made Python to ask user to input height in meters. If user 
puts certain value in meter, then it converts it to feet and inches as 
follows:
 >  
 >
 > Enter the height (in metres): 1.6
 >
 > It is 5 feet, 3 inches high.
 >  
 >  
 > What I want to do is to make it type only words. For example, instead 
of its saying, "It is 5 feet, 3 inches high," I want it to say, "it is 
five feet, three inches high."
 > I'd appreciate any suggestions.

I made something similar in the past.  First I break it into two 
functions, one function handles 0-999 and return '' for zero or a 
meaningful value for 999, another function handles how many groups there 
are and for each one, gets the value for it calls the first function, 
and appends the correct word.  This only works for the English language 
though

Brian Vanderburg II

num_words1 = ("zero", # not used
             "one",
             "two",
             "three",
             "four",
             "five",
             "six",
             "seven",
             "eight",
             "nine",
             "ten",
             "eleven",
             "twelve",
             "thirteen",
             "fourteen",
             "fifteen",
             "sixteen",
             "seventeen",
             "eighteen",
             "nineteen")

num_words2 = ("twenty",
             "thirty",
             "forty",
             "fifty",
             "sixty",
             "seventy",
             "eighty",
             "ninety")

num_words3 = ("thousand",
             "million",
             "billion",
             "trillion",
             "quadrillion")

def word_func1(value):
   # value can be from 0 to 999
   result = ''

   if value == 0:
       return result

   # Handle hundreds
   if value >= 100:
       hvalue = int(value / 100)
       if result:
           result += ' '
       result += num_words1[hvalue]
       result += ' hundred'
       value -= (hvalue * 100)

   if value == 0:
       return result

   # Handle 1-19
   if value < 20:
       if result:
           result += ' '
       result += num_words1[value]
       return result

   # Handle 10s (20-90)
   tvalue = int(value / 10)
   if result:
       result += ' '
   result += num_words2[tvalue - 2]
   value -= (tvalue * 10)

   if value == 0:
       return result

   # Handle ones
   if result:
       result += ' '
   result += num_words1[value]

   return result

def word_func2(value):
   result = ''

   if value == 0:
       return 'zero'

   # Determine support values
   divider = 1
   l = len(num_words3)
   for i in range(l):
       divider *= 1000

   for i in range(l):
       if value >= divider:
           dvalue = int(value / divider)
           if result:
               result += ' '
           result += word_func1(dvalue)
           result += ' '
           result += num_words3[l - i - 1]
           value -= (dvalue * divider)
       divider /= 1000

   if value > 0:
       if result:
           result += ' '
       result += word_func1(value)

   return result

number_to_word = word_func2



From rhodri at wildebst.demon.co.uk  Thu Feb  5 22:37:24 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 03:37:24 -0000
Subject: return multiple objects
In-Reply-To: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
Message-ID: <op.uowu0mxba8ncjz@gnudebst>

On Fri, 06 Feb 2009 03:03:01 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> Is it correct that if I want to return multiple objects from a function I
> need to in some way combine them?
> def test1():
>     a = [1,3,5,7]
>     b = [2,4,6,8]
>     c=[a,b]
>    return a, b # this does not work?
>    return [a, b] # does not work?
>    return c # this works but I don't like it, , is there a better way?

Strictly speaking, you can only return one object from a function.   
However,
that one object can be a container (list, tuple, dict, set, or what have
you) that contains multiple objects.  Tuples are a popular choice:

   return a, b

...but almost any ordered type would do, because you can automagically
unpack the results if you want to:

   x, y = test1()

(You might be expecting brackets around the "a, b" and the "x, y", and
you'd be sort of right.  The brackets (parentheses) for tuples are
optional, except for a couple of cases where you *have* to put them
in to avoid ambiguity.  I tend to put them in always, but leaving them
out in cases like this seems to be normal practice.)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skippy.hammond at gmail.com  Thu Feb  5 22:50:53 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 14:50:53 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
Message-ID: <498BB39D.5070809@gmail.com>

On 6/02/2009 11:37 AM, Volodya wrote:
> Hi all,
>
> I think I've found a small bug with multiprocessing package on
> Windows.

I'd actually argue its a bug in pythonservice.exe - it should set 
sys.argv[] to resemble a normal python process with argv[0] being the 
script.  I'll fix it...

Cheers,

Mark


From skippy.hammond at gmail.com  Thu Feb  5 23:26:08 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 15:26:08 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BB39D.5070809@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com>
Message-ID: <498BBBE0.6090704@gmail.com>

On 6/02/2009 2:50 PM, Mark Hammond wrote:
> On 6/02/2009 11:37 AM, Volodya wrote:
>> Hi all,
>>
>> I think I've found a small bug with multiprocessing package on
>> Windows.
>
> I'd actually argue its a bug in pythonservice.exe - it should set
> sys.argv[] to resemble a normal python process with argv[0] being the
> script. I'll fix it...

Actually it appears I spoke too soon:

* A bug in pywin32 exists such that when you use 'debug' on a service, 
the argv reflected the full argv of the application, including the 
'-debug' portion of the command-line.  However, even if that is fixed, 
the next argument is actually the name of the service (as declared in 
the .py file for the service), not the .py module itself.  Thus, I could 
make argv a little more sane in this case, but still the initial problem 
would remain as argv[0] would still not be a .py file.

* When the service is started by windows itself, there are usually zero 
additional command-line arguments.  If there *are* arguments, they are 
likely to be the string the user entered via control panel as a special 
case (Windows doesn't actually remember service args - they are used 
once and discarded).  It is important we continue to expose whatever 
argv we actually got from Windows to the service code.

So unfortunately I don't think I can change pythonservice to resolve the 
issue you reported.

Cheers,

Mark


From vincent at vincentdavis.net  Thu Feb  5 23:29:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 5 Feb 2009 21:29:49 -0700
Subject: return multiple objects
In-Reply-To: <op.uowu0mxba8ncjz@gnudebst>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
	<op.uowu0mxba8ncjz@gnudebst>
Message-ID: <77e831100902052029id5b939cn605e1f9728cb01cf@mail.gmail.com>

That is what I was missing,
Thanks
Vincent Davis



On Thu, Feb 5, 2009 at 8:37 PM, Rhodri James <rhodri at wildebst.demon.co.uk>wrote:

> On Fri, 06 Feb 2009 03:03:01 -0000, Vincent Davis <
> vincent at vincentdavis.net> wrote:
>
>  Is it correct that if I want to return multiple objects from a function I
>> need to in some way combine them?
>> def test1():
>>    a = [1,3,5,7]
>>    b = [2,4,6,8]
>>    c=[a,b]
>>   return a, b # this does not work?
>>   return [a, b] # does not work?
>>   return c # this works but I don't like it, , is there a better way?
>>
>
> Strictly speaking, you can only return one object from a function.
>  However,
> that one object can be a container (list, tuple, dict, set, or what have
> you) that contains multiple objects.  Tuples are a popular choice:
>
>  return a, b
>
> ...but almost any ordered type would do, because you can automagically
> unpack the results if you want to:
>
>  x, y = test1()
>
> (You might be expecting brackets around the "a, b" and the "x, y", and
> you'd be sort of right.  The brackets (parentheses) for tuples are
> optional, except for a couple of cases where you *have* to put them
> in to avoid ambiguity.  I tend to put them in always, but leaving them
> out in cases like this seems to be normal practice.)
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From greg at cosc.canterbury.ac.nz  Thu Feb  5 23:56:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Fri, 06 Feb 2009 17:56:51 +1300
Subject: ANN: SuPy - Script Sketchup with Python
Message-ID: <mailman.8980.1233928765.3487.python-announce-list@python.org>

SuPy 1.0
--------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

   http://www.cosc.canterbury.ac.nz/SuPy/

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From orlenko at gmail.com  Fri Feb  6 00:21:40 2009
From: orlenko at gmail.com (Volodymyr Orlenko)
Date: Thu, 05 Feb 2009 21:21:40 -0800
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BBBE0.6090704@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>
Message-ID: <498BC8E4.7000108@gmail.com>



On 05/02/2009 8:26 PM, Mark Hammond wrote:
> On 6/02/2009 2:50 PM, Mark Hammond wrote:
>> On 6/02/2009 11:37 AM, Volodya wrote:
>>> Hi all,
>>>
>>> I think I've found a small bug with multiprocessing package on
>>> Windows.
>>
>> I'd actually argue its a bug in pythonservice.exe - it should set
>> sys.argv[] to resemble a normal python process with argv[0] being the
>> script. I'll fix it...
>
> Actually it appears I spoke too soon:
>
> * A bug in pywin32 exists such that when you use 'debug' on a service, 
> the argv reflected the full argv of the application, including the 
> '-debug' portion of the command-line.  However, even if that is fixed, 
> the next argument is actually the name of the service (as declared in 
> the .py file for the service), not the .py module itself.  Thus, I 
> could make argv a little more sane in this case, but still the initial 
> problem would remain as argv[0] would still not be a .py file.
>
> * When the service is started by windows itself, there are usually 
> zero additional command-line arguments.  If there *are* arguments, 
> they are likely to be the string the user entered via control panel as 
> a special case (Windows doesn't actually remember service args - they 
> are used once and discarded).  It is important we continue to expose 
> whatever argv we actually got from Windows to the service code.
>
> So unfortunately I don't think I can change pythonservice to resolve 
> the issue you reported.
>
Thanks Mark, this makes perfect sense.

In the patch I submitted, I simply check if the name of the supposed 
module ends with ".exe". It works fine for my case, but maybe this is 
too general. Is there a chance that a Python module would end in ".exe"? 
If so, maybe we should check specifically for "pythonservice.exe". But 
then, if someone renames the executable (as I did, because I wanted to 
see meaningful service names in the process list), the patch will not 
work. Maybe there's another way to fix the forking module?


From agile.scrapping3 at gmail.com  Fri Feb  6 00:52:26 2009
From: agile.scrapping3 at gmail.com (agile)
Date: Thu, 5 Feb 2009 21:52:26 -0800 (PST)
Subject: What is difference between ADO and RDO
Message-ID: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>

Explain ADO and RDO


From prologic at shortcircuit.net.au  Fri Feb  6 00:54:16 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 15:54:16 +1000
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BC8E4.7000108@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>
	<498BC8E4.7000108@gmail.com>
Message-ID: <e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>

On Fri, Feb 6, 2009 at 3:21 PM, Volodymyr Orlenko <orlenko at gmail.com> wrote:
> In the patch I submitted, I simply check if the name of the supposed module
> ends with ".exe". It works fine for my case, but maybe this is too general.
> Is there a chance that a Python module would end in ".exe"? If so, maybe we
> should check specifically for "pythonservice.exe". But then, if someone
> renames the executable (as I did, because I wanted to see meaningful service
> names in the process list), the patch will not work. Maybe there's another
> way to fix the forking module?

I believe the best way to fix this is to fix the underlying
issue that Mark has pointed out (monkey-patching mp won't do).

--JamesMills


From mail at microcorp.co.za  Fri Feb  6 00:57:28 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 07:57:28 +0200
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org><mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <007701c9881f$cb9875e0$0d00a8c0@hendrik>

"Mensanator" <m...r at aol.com>


>On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>> > (duck)
>>
>> > 542 comp.lang.python rtfm
>>
>> What is so unfriendly about 'read the fine manual'?
>
>You've seen a fine manual?

Oh Fine!

- Hendrik




From clp2 at rebertia.com  Fri Feb  6 01:02:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 22:02:16 -0800
Subject: What is difference between ADO and RDO
In-Reply-To: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>
References: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902052202hc2e8101r58bf7d2378864705@mail.gmail.com>

On Thu, Feb 5, 2009 at 9:52 PM, agile <agile.scrapping3 at gmail.com> wrote:
> Explain ADO and RDO

Take 5 seconds to Google them and find their Wikipedia pages:
http://en.wikipedia.org/wiki/Remote_Data_Objects
http://en.wikipedia.org/wiki/ActiveX_Data_Objects

Apparently they're 2 Microsoft technology acronyms -- and they're
**completely irrelevant** to this mailinglist, which is about
*Python*.

My but your post is lazy, terse, and rude.

Bye now,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Fri Feb  6 01:23:32 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 08:23:32 +0200
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org><1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
	<gmfq7t$77u$1@ger.gmane.org>
Message-ID: <00bb01c98824$592b9b40$0d00a8c0@hendrik>


"Steve Holden" <steve at h...eb.com> wrote:

> Yes, and I'm fine well sure this is somewhere between a silly thread and
> a troll.

"Fine" reads wrong - it should be fining.

Silly? Us here on clp, silly?

What a monstrous thought!

I'll have you know this is a respectable
establishment, and you should be grateful
that such fine, serious folk suffer your 
impertinence without taking umbrage !

Ok Steve now it's your turn to tell me it 
does not scan.

I think this thread has buggered up a perfectly
good word for me - It will be difficult, in future,
to hear the word without having to suppress
an involuntary snigger.

- Hendrik




From r.warhekar at gmail.com  Fri Feb  6 01:27:02 2009
From: r.warhekar at gmail.com (Rahul)
Date: Thu, 5 Feb 2009 22:27:02 -0800 (PST)
Subject: i have an query regarding pyodbc
Message-ID: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>

hello all,

I have installed pyodbc on my red hat enterprise 4 linux machine but
when i go to use that using statement,

import pyodbc

through python console it gives me error as

ImportError : dynamic module does not define init function
(initpyodbc)

and when i do 'nm pyodbc.so' command i get output as

[root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
000003ec t call_gmon_start 00001600 b completed.1 000014fc d
__CTOR_END__
000014f8 d __CTOR_LIST__
         w __cxa_finalize@@GLIBC_2.1.3
000004a8 t __do_global_ctors_aux
00000410 t __do_global_dtors_aux
000015f8 d __dso_handle
00001504 d __DTOR_END__
00001500 d __DTOR_LIST__
0000150c A _DYNAMIC
00001600 A _edata
00001604 A _end
000004d8 T _fini
0000046c t frame_dummy
000004f4 r __FRAME_END__
000015e8 A _GLOBAL_OFFSET_TABLE_
         w __gmon_start__
000003b4 T _init
00001508 d __JCR_END__
00001508 d __JCR_LIST__
         w _Jv_RegisterClasses
000015fc d p.0


which means there is no init function.

So what might be the cause for that?

I have build that pyodbc twice.
Any help regarding this will be greatly appreciated.

Thanks & Regards
Rahul


From ths at arl.com.pk  Fri Feb  6 01:34:53 2009
From: ths at arl.com.pk (Tehseen Siddiqui)
Date: Fri, 06 Feb 2009 11:34:53 +0500
Subject: Python Power Point Slides
Message-ID: <4041891322e2bf49ab400664bc811fae@121.100.100.103>






----------------------------------------------------------------------
DISCLAIMER:  The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. ARL cannot accept liability for any loss or damage sustained as a result of software viruses.
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From aleksandr.goretoy at gmail.com  Fri Feb  6 01:41:20 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Fri, 6 Feb 2009 00:41:20 -0600
Subject: reconstruct html form in pyGTK window and create dict from pyGTK
Message-ID: <fa98a9e30902052241j4aa19543k6b1282b9ff704e@mail.gmail.com>

Hello All,

What would be the best way to fetch a form/s from a webpage and then
recreate it in a pygtk window?

I'm doing some research on this for a project called pynutbutter. This is
for jellpy actually, which handles creating option mappings for pynutbutter
from a GUI.
The things I know I would need some examples on:

How to work multiple glade files? (so i can have multiple pages for
different types of options) more efficient way, is this a good option?

loading of forms fields and reconstructiting in pyGTK with
comboboxes/comboboxtextentry textboxes/textentry and textviews, not how to
load them or display them...I can see that on pygtk website....but the more
efficient way to do this dynamically.

What is the best way to create a dict from a gui? just have a user type the
dict: somedict={"some":thing} or have another window pop up that handles for
name value pairs of the dict and a field for dict name.

After all this what would be the best way for me to merge this dict into a
options file. There will be other options in there. How would I only either
prepend the new dict or if one with same name exists overwrite it. Would
that be a safe move?

What would be the most effiecient and user friendly way to contruct this on
a form basis in a pyGTK GUI

defaults = {"formfield":"somevalue","anotherfield":"somefieldvalue"}
mappings =
{"somefield":"filefield1","anotherfield":"some_function(filefield2)"}
headers = {"filefield1":"somefield","filefield2":"anotherfield"}

What would be the best way for me to construct this dict from a user
friendly form in pyGTK....

Sorry this is alot of questions. Any advise on this matter will be greatly
appreciated. Thank you.


-Alex Goretoy
http://www.alexgoretoy.com
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From aleksandr.goretoy at gmail.com  Fri Feb  6 02:07:41 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Fri, 6 Feb 2009 01:07:41 -0600
Subject: Where to host a (Python) project?
In-Reply-To: <87bptgxu2y.fsf@benfinney.id.au>
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com> <87bptgxu2y.fsf@benfinney.id.au>
Message-ID: <fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>

I use google code.
http://code.google.com/p/pynutbutter

-Alex Goretoy
http://www.alexgoretoy.com



On Thu, Feb 5, 2009 at 6:55 PM, Ben Finney <
bignose+hates-spam at benfinney.id.au <bignose%2Bhates-spam at benfinney.id.au>>wrote:

> aahz at pythoncraft.com (Aahz) writes:
>
> > In article <
> 6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
> > andrew cooke  <andrew at acooke.org> wrote:
> > >hi, just fyi, i investigated this and you can join any publicly
> > >readable group by sending an email to the "-subscribe" address. you
> > >do not need a google login for this and, as far as i can tell, it
> > >then operates for you like a normal mailing list.
> >
> > The same thing is theoretically true for Yahoo groups, but I've
> > heard from people over the years about various difficulties fixing
> > problems with list subscriptions in the absence of a real Yahoo
> > login and I'm not particularly interested in finding out that the
> > same thing ends up being true for Google lists.
>
> Indeed it does. I have succeeded in subscribing to Google mailing
> lists in the absence of a Google account, but *managing* that
> subscription thereafter in the absence of a Google account is
> obnoxiously difficult. Your caution is well advised.
>
> --
>  \                "I got fired from my job the other day. They said my |
>  `\          personality was weird. ? That's okay, I have four more." |
> _o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
> Ben Finney
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From orlenko at gmail.com  Fri Feb  6 02:11:02 2009
From: orlenko at gmail.com (Volodymyr Orlenko)
Date: Thu, 05 Feb 2009 23:11:02 -0800
Subject: Using multiprocessing from a Windows service
In-Reply-To: <e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>	
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>	
	<498BC8E4.7000108@gmail.com>
	<e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>
Message-ID: <498BE286.20008@gmail.com>



On 05/02/2009 9:54 PM, James Mills wrote:
> On Fri, Feb 6, 2009 at 3:21 PM, Volodymyr Orlenko <orlenko at gmail.com> wrote:
>   
>> [...] Maybe there's another
>> way to fix the forking module?
>>     
>
> I believe the best way to fix this is to fix the underlying
> issue that Mark has pointed out (monkey-patching mp won't do).
>
>   
But according to Mark's second message in this thread, there's no way to 
make pythonservice.exe set its sys.argv[0] to a python module -- it uses 
sys.argv for debug parameters in debug mode, and for custom service 
parameters in normal mode.


From m.gritsch at gmail.com  Fri Feb  6 02:28:52 2009
From: m.gritsch at gmail.com (Markus Gritsch)
Date: Fri, 6 Feb 2009 08:28:52 +0100
Subject: web2py 1.56 is OUT
In-Reply-To: <9B19AA5B-306A-49F8-BBF2-1F8F31B2E818@cs.depaul.edu>
References: <9B19AA5B-306A-49F8-BBF2-1F8F31B2E818@cs.depaul.edu>
Message-ID: <533b7d320902052328ua9f8e41h922b5ef6645896d2@mail.gmail.com>

Hi,

when copying and pasting the example from the announcement into files,
it wont run due to some errors:

2009/2/5 Massimo Di Pierro <MDiPierro at cs.depaul.edu>:
>
> Example of code (complete app)
> =========================
>    ## in model db.py
>    from gluon.tools import *
>    db=SQLDB()
>    db.define_table('puppy', db.Field('name'), db.Field('image','upload'))
>    auth=Auth(globals(),db)

Here the line auth.define_tables() is missing.

>    crud=Crud(flobals(),db)

flobals -> globals

>    ## in controller default.py
>    def user():
>        " to expose register, login, logout, etc "
>        return dict(form=auth())
>
>    @auth.requires_login()
>    def data():
>         " to expose select, create, update, delete, etc "

The above line is indented one character too much which results in an error.

>        return dict(form=crud())
>
>    @auth.requires_login()
>    def download():
>        " for downloading uploaded images "
>        return response.download(request,db)
>
>    ## in view default/user.html
>    {{extend 'layout.html'}}
>    <div>{{=form}}</div>
>
>    ## in view default/data.html
>    {{extend 'layout.html'}}
>    <div>{{=form}}</div>

The above example is not (although stated) a complete app, even when
correcting the errors.  No index action, no links to register, login,
etc, no functionality in the data action.  If one has not already read
the web2py auth docu, one cannot understand what should be going on.

If I would have been looking at web2py for the first time, I would
have been disapointed and would not bother looking deeper.  Also the
glued-together code style without spaces after colons and around
operators looks quite special.  When suggesting PEP 8 compliance I
suggested using it in the *examples*, and just optionally in the gluon
code itself.  The example and the documentation is the stuff people
are seeing and reading when trying to get started with web2py.

I know, the above paragraphs sound quite negative.  *I* like web2py
very much and am a happy user.  I just fear that such examples will
not draw new users towards this great project.  Maybe use a simple
example without Auth the next time, which is *really* complete and
fully functional.

Kind regards,
Markus


From dq at gmail.com  Fri Feb  6 02:32:54 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 08:32:54 +0100
Subject: urllib2 performance on windows, usb connection
Message-ID: <gmgp38$m2s$00$1@news.t-online.com>

I've googled this pretty extensively and can't find anyone who's had the 
same problem, so here it is:

I wrote a console program in python to download podcasts, so speed is an 
issue.  I have 1.6 M down.  The key bit of downloading code is this:

source = urllib2.urlopen( url )
target = open( filename, 'wb' )
target.write( source.read() )

This runs great on Ubuntu.  I get DL speeds of about 1.5 Mb/s on the 
SATA HD or on a usb-connected iPod, but if I run the same program on 
Windows (with a 2 GHz core 2 duo, 7200 rpm sata drive---better hardware 
specs than the Ubuntu box), it maxes out at about 500 kb/s.  Worse, if I 
DL directly to my iPod in disk mode, I'm lucky if I even hit 100 kb/s.

So does anyone know what the deal is with this?  Why is the same code so 
much slower on Windows?  Hope someone can tell me before a holy war 
erupts :-)

--danny


From martin at v.loewis.de  Fri Feb  6 02:48:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 06 Feb 2009 08:48:41 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmgp38$m2s$00$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>
Message-ID: <498beb5a$0$3305$9b622d9e@news.freenet.de>

> So does anyone know what the deal is with this?  Why is the same code so
> much slower on Windows?  Hope someone can tell me before a holy war
> erupts :-)

Only the holy war can give an answer here. It certainly has *nothing* to
do with Python; Python calls the operating system functions to read from
the network and write to the disk almost directly. So it must be the
operating system itself that slows it down.

To investigate further, you might drop the write operating, and measure
only source.read(). If that is slower, then, for some reason, the
network speed is bad on Windows. Maybe you have the network interfaces
misconfigured? Maybe you are using wireless on Windows, but cable on
Linux? Maybe you have some network filtering software running on
Windows? Maybe it's just that Windows sucks?-)

If the network read speed is fine, but writing slows down, I ask the
same questions. Perhaps you have some virus scanner installed that
filters all write operations? Maybe Windows sucks?

Regards,
Martin



From curt.hash at gmail.com  Fri Feb  6 03:10:43 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 01:10:43 -0700
Subject: Fastest database solution
Message-ID: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>

I'm writing a small application for detecting source code plagiarism that
currently relies on a database to store lines of code.

The application has two primary functions: adding a new file to the database
and comparing a file to those that are already stored in the database.

I started out using sqlite3, but was not satisfied with the performance
results. I then tried using psycopg2 with a local postgresql server, and the
performance got even worse. My simple benchmarks show that sqlite3 is an
average of 3.5 times faster at inserting a file, and on average less than a
tenth of a second slower than psycopg2 at matching a file.

I expected postgresql to be a lot faster ... is there some peculiarity in
psycopg2 that could be causing slowdown? Are these performance results
typical? Any suggestions on what to try from here? I don't think my
code/queries are inherently slow, but I'm not a DBA or a very accomplished
Python developer, so I could be wrong.

Any advice is appreciated.
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From duncan.booth at invalid.invalid  Fri Feb  6 04:05:25 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 6 Feb 2009 09:05:25 GMT
Subject: urllib2 performance on windows, usb connection
References: <gmgp38$m2s$00$1@news.t-online.com>
Message-ID: <Xns9BAA5BD5A6FF6duncanbooth@127.0.0.1>

dq <dq at gmail.com> wrote:

> This runs great on Ubuntu.  I get DL speeds of about 1.5 Mb/s on the 
> SATA HD or on a usb-connected iPod, but if I run the same program on 
> Windows (with a 2 GHz core 2 duo, 7200 rpm sata drive---better hardware 
> specs than the Ubuntu box), it maxes out at about 500 kb/s.  Worse, if I 
> DL directly to my iPod in disk mode, I'm lucky if I even hit 100 kb/s.
> 
> So does anyone know what the deal is with this?  Why is the same code so 
> much slower on Windows?  Hope someone can tell me before a holy war 
> erupts :-)
> 

Just a guess, but are you running any kind of virus scanning software on 
Windows? That could have a massive impact on the speed of writing to disc.

-- 
Duncan Booth http://kupuguy.blogspot.com


From dickinsm at gmail.com  Fri Feb  6 04:11:55 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Fri, 6 Feb 2009 01:11:55 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8926.1233872413.3487.python-list@python.org><1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
	<gmfq7t$77u$1@ger.gmane.org>
	<mailman.8957.1233902385.3487.python-list@python.org>
Message-ID: <155f77da-1071-4122-bff0-44d868f2c7b2@i18g2000prf.googlegroups.com>

On Feb 6, 6:23?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> I think this thread has buggered up a perfectly
                          ^^^^^^^^^^^

Such language.  I'm appalled.

Mark


From rogerb at rogerbinns.com  Fri Feb  6 04:12:45 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Fri, 06 Feb 2009 01:12:45 -0800
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <gmguue$uj4$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Curt Hash wrote:
> I started out using sqlite3, but was not satisfied with the performance
> results. I then tried using psycopg2 with a local postgresql server, and
> the performance got even worse. 

SQLite is in the same process.  Communication with postgres is via
another process so marshalling the traffic and context switches will
impose overhead as you found.

> I don't think
> my code/queries are inherently slow, but I'm not a DBA or a very
> accomplished Python developer, so I could be wrong.

It doesn't sound like a database is the best solution to your issue
anyway.  A better solution would likely be some form of hashing the
lines and storing something that gives quick hash lookups.  The hash
would have to do things like not care what variable names are used etc.

There are already lots of plagiarism detectors out there so it may be
more prudent using one of them, or at least learn how they do things so
your own system could improve on them.

Roger
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From tino at wildenhain.de  Fri Feb  6 04:17:42 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Fri, 06 Feb 2009 10:17:42 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <498C0036.4070805@wildenhain.de>

Hi Curt,

Curt Hash wrote:
> I'm writing a small application for detecting source code plagiarism 
> that currently relies on a database to store lines of code.
> 
> The application has two primary functions: adding a new file to the 
> database and comparing a file to those that are already stored in the 
> database.
> 
> I started out using sqlite3, but was not satisfied with the performance 
> results. I then tried using psycopg2 with a local postgresql server, and 
> the performance got even worse. My simple benchmarks show that sqlite3 
> is an average of 3.5 times faster at inserting a file, and on average 
> less than a tenth of a second slower than psycopg2 at matching a file.
> 
> I expected postgresql to be a lot faster ... is there some peculiarity 
> in psycopg2 that could be causing slowdown? Are these performance 
> results typical? Any suggestions on what to try from here? I don't think 
> my code/queries are inherently slow, but I'm not a DBA or a very 
> accomplished Python developer, so I could be wrong.

Off hand thats hard to tell w/o any details on what you are actually
doing. At least an outline what kind of data you are storing and
of course details of your database configuration would be helpful.

Please note that postgres is quite good at handling concurrent load -
this does not mean its best or every desk top database application.

Regards
Tino
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From soft_smith at yahoo.com  Fri Feb  6 04:49:34 2009
From: soft_smith at yahoo.com (Kalyankumar Ramaseshan)
Date: Fri, 6 Feb 2009 01:49:34 -0800 (PST)
Subject: Question on Strings
Message-ID: <984064.27780.qm@web112219.mail.gq1.yahoo.com>


Hi,

Excuse me if this is a repeat question!

I just wanted to know how are strings represented in python?

I need to know in terms of:

a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?
b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)? 

Any help in this regard is appreciated.

Thank you.

Regards
Kalyan



      



From asmodai at in-nomine.org  Fri Feb  6 04:54:06 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Fri, 6 Feb 2009 10:54:06 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <20090206095406.GL14658@nexus.in-nomine.org>

-On [20090206 09:11], Curt Hash (curt.hash at gmail.com) wrote:
>I'm writing a small application for detecting source code plagiarism that
>currently relies on a database to store lines of code.
>
>The application has two primary functions: adding a new file to the database
>and comparing a file to those that are already stored in the database.

Maybe CouchDB [1] is more in line with what you need.

[1] http://couchdb.apache.org/

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From agile.scrapping at gmail.com  Fri Feb  6 04:56:22 2009
From: agile.scrapping at gmail.com (Agile Consulting)
Date: Fri, 6 Feb 2009 01:56:22 -0800 (PST)
Subject: What is difference between ADO and RDO
Message-ID: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>

Explain ADO and RDO


From clp2 at rebertia.com  Fri Feb  6 05:24:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 02:24:09 -0800
Subject: Question on Strings
In-Reply-To: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
Message-ID: <50697b2c0902060224m6b5d5c09uf4c8cbdb0c83d1bf@mail.gmail.com>

On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
<soft_smith at yahoo.com> wrote:
>
> Hi,
>
> Excuse me if this is a repeat question!
>
> I just wanted to know how are strings represented in python?
>
> I need to know in terms of:
>
> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

IIRC, Depends on what the build settings were when CPython was
compiled. UTF-16 is the default.

> b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)?

No. They are implicitly converted to ASCII in such cases. To properly
handle non-ASCII Unicode characters, you need to encode/decode the
strings to/from bytes manually by specifying the encoding.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From r.warhekar at gmail.com  Fri Feb  6 05:53:31 2009
From: r.warhekar at gmail.com (Rahul)
Date: Fri, 6 Feb 2009 02:53:31 -0800 (PST)
Subject: i have an query regarding pyodbc
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
Message-ID: <ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>

On Feb 6, 11:27?am, Rahul <r.warhe... at gmail.com> wrote:
> hello all,
>
> I have installed pyodbc on my red hat enterprise 4 linux machine but
> when i go to use that using statement,
>
> import pyodbc
>
> through python console it gives me error as
>
> ImportError : dynamic module does not define init function
> (initpyodbc)
>
> and when i do 'nm pyodbc.so' command i get output as
>
> [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
> 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
> __CTOR_END__
> 000014f8 d __CTOR_LIST__
> ? ? ? ? ?w __cxa_finalize@@GLIBC_2.1.3
> 000004a8 t __do_global_ctors_aux
> 00000410 t __do_global_dtors_aux
> 000015f8 d __dso_handle
> 00001504 d __DTOR_END__
> 00001500 d __DTOR_LIST__
> 0000150c A _DYNAMIC
> 00001600 A _edata
> 00001604 A _end
> 000004d8 T _fini
> 0000046c t frame_dummy
> 000004f4 r __FRAME_END__
> 000015e8 A _GLOBAL_OFFSET_TABLE_
> ? ? ? ? ?w __gmon_start__
> 000003b4 T _init
> 00001508 d __JCR_END__
> 00001508 d __JCR_LIST__
> ? ? ? ? ?w _Jv_RegisterClasses
> 000015fc d p.0
>
> which means there is no init function.
>
> So what might be the cause for that?
>
> I have build that pyodbc twice.
> Any help regarding this will be greatly appreciated.
>
> Thanks & Regards
> Rahul

this problem was due to not proper building of pyodbc


From r.warhekar at gmail.com  Fri Feb  6 05:56:56 2009
From: r.warhekar at gmail.com (Rahul)
Date: Fri, 6 Feb 2009 02:56:56 -0800 (PST)
Subject: i have an query regarding pyodbc
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
	<ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>
Message-ID: <519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>

On Feb 6, 3:53?pm, Rahul <r.warhe... at gmail.com> wrote:
> On Feb 6, 11:27?am, Rahul <r.warhe... at gmail.com> wrote:
>
>
>
> > hello all,
>
> > I have installed pyodbc on my red hat enterprise 4 linux machine but
> > when i go to use that using statement,
>
> > import pyodbc
>
> > through python console it gives me error as
>
> > ImportError : dynamic module does not define init function
> > (initpyodbc)
>
> > and when i do 'nm pyodbc.so' command i get output as
>
> > [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
> > 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
> > __CTOR_END__
> > 000014f8 d __CTOR_LIST__
> > ? ? ? ? ?w __cxa_finalize@@GLIBC_2.1.3
> > 000004a8 t __do_global_ctors_aux
> > 00000410 t __do_global_dtors_aux
> > 000015f8 d __dso_handle
> > 00001504 d __DTOR_END__
> > 00001500 d __DTOR_LIST__
> > 0000150c A _DYNAMIC
> > 00001600 A _edata
> > 00001604 A _end
> > 000004d8 T _fini
> > 0000046c t frame_dummy
> > 000004f4 r __FRAME_END__
> > 000015e8 A _GLOBAL_OFFSET_TABLE_
> > ? ? ? ? ?w __gmon_start__
> > 000003b4 T _init
> > 00001508 d __JCR_END__
> > 00001508 d __JCR_LIST__
> > ? ? ? ? ?w _Jv_RegisterClasses
> > 000015fc d p.0
>
> > which means there is no init function.
>
> > So what might be the cause for that?
>
> > I have build that pyodbc twice.
> > Any help regarding this will be greatly appreciated.
>
> > Thanks & Regards
> > Rahul
>
> this problem was due to not proper building of pyodbc

Now my problem was,
i have two versions of python installed at different locations but
when i use import statement from psp pages
it displays the error as
ImportError : dynamic module does not define init function(initpyodbc)

this error was due to pointing to older version of python.

So, i want to know how to point my import statements to the new
version of python.

Thanks & regards
Rahul


From Ken at Elkabany.com  Fri Feb  6 06:03:28 2009
From: Ken at Elkabany.com (Ken Elkabany)
Date: Fri, 6 Feb 2009 03:03:28 -0800
Subject: Changing return of type(obj)
Message-ID: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>

Hello,

I am attempting to fully-simulate an 'int' object with a custom object type.
It is part of a library I am creating for python futures and promises. Is
there anyway such that type(my_object) can return <type 'int'>? Or for that
matter, any other primitive? I do not care how dirty the solution might
possibly be; Could there be a way through the C API? Though I predict it
will cause a mess with the interpreter.

Thanks,

Ken Elkabany
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From tino at wildenhain.de  Fri Feb  6 06:11:38 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Fri, 06 Feb 2009 12:11:38 +0100
Subject: Question on Strings
In-Reply-To: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
Message-ID: <498C1AEA.8060303@wildenhain.de>

Hi,

Kalyankumar Ramaseshan wrote:
> Hi,
> 
> Excuse me if this is a repeat question!
> 
> I just wanted to know how are strings represented in python?

It depents on if you mean python2.x or python3.x - the model
changed.

Python 2.x knows str and unicode  - the former a sequence
of single byte characters and unicode depending on configure
options either 16 or 32 bit per character.

str in python3.x replaces unicode and what formerly used
to be like str is now bytes (iirc).

> I need to know in terms of:
> 
> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

It uses an internal fixed length encoding for unicode, not UTF

> b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)? 

Nope. You need to do this explicitely. Default encoding for python2.x
implicit conversion is ascii.

In python2.x you would use unicodestr.encode('utf-8')
and simplestr.decode('utf-8') to convert an utf-8 encoded
string back to internal unicode.

There are many encodings available to select from.

> Any help in this regard is appreciated.

Please see also pythons documentation which is very
good and just try it out in the interactive interpreter

Regards
Tino
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From clp2 at rebertia.com  Fri Feb  6 06:42:30 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 03:42:30 -0800
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>

On Fri, Feb 6, 2009 at 3:03 AM, Ken Elkabany <Ken at elkabany.com> wrote:
> Hello,
>
> I am attempting to fully-simulate an 'int' object with a custom object type.
> It is part of a library I am creating for python futures and promises. Is
> there anyway such that type(my_object) can return <type 'int'>? Or for that
> matter, any other primitive? I do not care how dirty the solution might
> possibly be; Could there be a way through the C API? Though I predict it
> will cause a mess with the interpreter.

Any particular reason why subclassing 'int' wouldn't be good enough?
(You did know you can do that, right?)
I know you can subclass int at the Python level and I would think you
should be able to do it at the C level also (if not, the design just
gets only slightly more involved).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Ken at Elkabany.com  Fri Feb  6 06:49:17 2009
From: Ken at Elkabany.com (Ken Elkabany)
Date: Fri, 6 Feb 2009 03:49:17 -0800
Subject: Changing return of type(obj)
In-Reply-To: <50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
	<50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
Message-ID: <d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>

I would simply subclass 'int', but this object needs to be general enough to
pretend to be an 'int', 'NoneType', 'str', etc... A long shot: Can I change
the base class on an instance by instance basis depending on the need? Well,
now I can imagine having a class factory that will spawn for me the class
that inherits the correct base type. Any other solutions?

Thanks Chris.

On Fri, Feb 6, 2009 at 3:42 AM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Fri, Feb 6, 2009 at 3:03 AM, Ken Elkabany <Ken at elkabany.com> wrote:
> > Hello,
> >
> > I am attempting to fully-simulate an 'int' object with a custom object
> type.
> > It is part of a library I am creating for python futures and promises. Is
> > there anyway such that type(my_object) can return <type 'int'>? Or for
> that
> > matter, any other primitive? I do not care how dirty the solution might
> > possibly be; Could there be a way through the C API? Though I predict it
> > will cause a mess with the interpreter.
>
> Any particular reason why subclassing 'int' wouldn't be good enough?
> (You did know you can do that, right?)
> I know you can subclass int at the Python level and I would think you
> should be able to do it at the C level also (if not, the design just
> gets only slightly more involved).
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From unews at nospam.onlinehome.de  Fri Feb  6 07:01:39 2009
From: unews at nospam.onlinehome.de (Uwe Grauer)
Date: Fri, 06 Feb 2009 13:01:39 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <mailman.8923.1233870149.3487.python-list@python.org>
References: <mailman.8719.1233689579.3487.python-list@python.org>	<gmc9ot$ops$1@online.de>
	<mailman.8923.1233870149.3487.python-list@python.org>
Message-ID: <gmh8r3$1ns$1@online.de>

Laszlo Nagy wrote:
> Uwe Grauer ?rta:
>> Laszlo Nagy wrote:
>> Get it from here:
>> http://www.firebirdsql.org/index.php?op=devel&sub=python
>>   
> Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can
> only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going
> to downgrade. :-(
> 

Can you point me to where you read about stopped support for FB 1.5?
Could it be that you have to just compile it against FB 1.5 libs to get
a working version?

Uwe


From __peter__ at web.de  Fri Feb  6 07:02:12 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 06 Feb 2009 13:02:12 +0100
Subject: sorting for recursive folder rename
References: <e385ba1f-cb8c-42eb-9095-2e4b4ad1ae95@e24g2000vbe.googlegroups.com>
	<mailman.5748.1229474227.3487.python-list@python.org>
	<d90cb283-c35f-4f5e-b04e-0396a6c66ffc@b38g2000prf.googlegroups.com>
Message-ID: <gmh8s3$4sf$01$1@news.t-online.com>

ianar? wrote:

> On Dec 16 2008, 7:36?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
> wrote:
>> On Tue, 16 Dec 2008 18:20:52 -0000, ianar? <ian... at gmail.com> wrote:
>> > Hello all,
>>
>> > I trying to recursivelyrenamefolders and files, and am looking for
>> > some ideas on the best way of doing this. The problem is that the
>> > given list of items can be in order, and one to all items may be
>> > renamed. Here is some preliminary code I have, but which does not work
>> > very well.
> 
> self.toRename has the following structure :
> [
> [original_name, new_name, os.path.isdir]
> ..
> ]
> 
> # define these here for faster processing
> def split(item):
>     return os.path.split(item)
> def addSep(path):
>     return os.sep + path + os.sep
> def recursiveFolderSort(x,y):
>     return cmp(y[0], x[0])
> 
> sortedRename = sorted(self.toRename)
> 
> # make a list of all folders that will be processed
> foldersToAdjust = []
> for item in sortedRename:
>     if item[2] is False:
>         oF = split(item[0])[1] # original folder name
>         nF = split(item[1])[1] # new folder name
>         if oF is not nF:
>             foldersToAdjust.append((oF, nF))
> 
> # replace all occurences of folders in path
> for i in range(len(self.toRename)):
>     for f in foldersToAdjust:
>         oF = addSep(f[0]) # original folder name
>         nF = addSep(f[1]) # new folder name
>         self.toRename[i][0] = self.toRename[i][0].replace(oF,nF)
>         self.toRename[i][1] = self.toRename[i][1].replace(oF,nF)
> 
>     if progressDialog.update(i) is False:
>         error = 'cancelled'
>         break
> 
> # make sure renaming will be in correct order !
> self.toRename.sort(recursiveFolderSort)
> 
>> import os
>>
>> for item in self.toRename:
>> os.renames(item[0], item[1])
>>
>> That's it. ?os.renames will take care of all the intermediate
>> directory creation so you don't even need to sort the list.
>>
>> --
>> Rhodri James *-* Wildebeeste Herder to the Masses
> 
> It's been a while since I decided to work on this again ...
> 
> Anyway, if only it were that easy !!
> 
> Traceback (most recent call last):
>   File "/home/ianare/Desktop/file-folder-ren/metamorphose2/Source/
> MainWindow.py", line 1477, in renameItems
>     os.renames(original[0], renamed[0])
>   File "/usr/lib/python2.5/os.py", line 213, in renames
>     rename(old, new)
> OSError: [Errno 2] No such file or directory
> 
> 
> The problem is that if a directory is changed, all lower instances
> need to be changed as well.
> 
> given the following directory structure ...
> 
> recursive
> |
> |_1
> |  |_1
> |  |  |_1.txt
> |  |  |_2.txt
> |  |_2
> |     |_1.txt
> |     |_2.txt
> |_2
>    |_1
>    |  |_1.txt
>    |  |_2.txt
>    |_2
>       |_1.txt
>       |_2.txt
> 
> ... and assuming I want to change :
> recursive/2/2/2.txt  -->  recursive/2/2/14.txt
> 
> but, I ALSO want to change :
> recursive/2  -->  recursive/04
> 
> it means that the first operation is really :
> recursive/04/2/2.txt  -->  recursive/04/2/14.txt
> 
> os.renames will work, but it needs to have the correct path, so it
> comes down to the same thing.
> 
> IOW, I need a way of :
> A) adjusting paths taking into consideration all changes up and down
> the tree
> B) sorting normalized paths so they are renamed in the proper sequence
> (depends on point 'A', obviously)
> 
> I'm pretty sure I can take care of 'B' with the following sorting
> method:
> 
> # order by path depth
> def recursiveFolderSort(x, y):
>     x = x[0].count(os.sep)
>     y = y[0].count(os.sep)
>     return cmp(x, y)
> self.toRename.sort(recursiveFolderSort)
> 
> but I still need a way of generating the correct names.


I don't see the problem. Just rename the deepest files and directories
first.

# untested

def old_depth((old, new)):
    p = os.path.abspath(old)
    return p.count(os.sep) - p.endswith(os.sep) # don't count trailing slash

pairs = sorted(self.toRename, key=old_depth, reverse=True)
for old, new in pairs:
   os.rename(old, new)

Because "recursive/2/2/2.txt" has more slashes it will be processed
before "recursive/2" and thus when the latter is processed the former's
path will change implicitly.

Peter


From lists at cheimes.de  Fri Feb  6 07:05:50 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 06 Feb 2009 13:05:50 +0100
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>	<50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
	<d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>
Message-ID: <gmh92v$ump$1@ger.gmane.org>

Ken Elkabany schrieb:
> I would simply subclass 'int', but this object needs to be general enough to
> pretend to be an 'int', 'NoneType', 'str', etc... A long shot: Can I change
> the base class on an instance by instance basis depending on the need? Well,
> now I can imagine having a class factory that will spawn for me the class
> that inherits the correct base type. Any other solutions?

No, it's not possible. The type is an inherent part of an object. Python
looks up methods and other attributes by looking at the type. The method
call obj.method() is implemented as type(obj).method(obj).

Christian



From steve at holdenweb.com  Fri Feb  6 07:09:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 07:09:29 -0500
Subject: Python Power Point Slides
In-Reply-To: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
References: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
Message-ID: <gmh99r$unb$1@ger.gmane.org>

Tehseen Siddiqui wrote:
> ------------------------------------------------------------------------
> 
> DISCLAIMER: The information in this email is confidential and may be
> legally privileged. [... etc.]

What information?
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From sjmachin at lexicon.net  Fri Feb  6 07:10:13 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 04:10:13 -0800 (PST)
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com> 
	<mailman.8967.1233915857.3487.python-list@python.org>
Message-ID: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>

On Feb 6, 9:24?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
>
> <soft_sm... at yahoo.com> wrote:
>
> > Hi,
>
> > Excuse me if this is a repeat question!
>
> > I just wanted to know how are strings represented in python?
>
> > I need to know in terms of:
>
> > a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

Neither.

>
> IIRC, Depends on what the build settings were when CPython was
> compiled. UTF-16 is the default.

Unicode strings are held as arrays of 16-bit numbers or 32-bit numbers
[of which only 21 are used]. If you must use an acronym, use UCS-2 or
UCS-4.

The UTF-n siblings are *external* representations.
2.x: a_unicode_object.decode('UTF-16') -> an_str_object
3.x: an_str_object.decode('UTF-16') -> a_bytes_object

By the way, has anyone come up with a name for the shifting effect
observed above on str, and also with repr, range, and the iter*
family? If not, I suggest that the language's association with the
best of English humour be widened so that it be dubbed the "Mad
Hatter's Tea Party" effect.


From mal at egenix.com  Fri Feb  6 07:19:55 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Fri, 06 Feb 2009 13:19:55 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <498C2AEB.1010907@egenix.com>

On 2009-02-06 09:10, Curt Hash wrote:
> I'm writing a small application for detecting source code plagiarism that
> currently relies on a database to store lines of code.
> 
> The application has two primary functions: adding a new file to the database
> and comparing a file to those that are already stored in the database.
> 
> I started out using sqlite3, but was not satisfied with the performance
> results. I then tried using psycopg2 with a local postgresql server, and the
> performance got even worse. My simple benchmarks show that sqlite3 is an
> average of 3.5 times faster at inserting a file, and on average less than a
> tenth of a second slower than psycopg2 at matching a file.
> 
> I expected postgresql to be a lot faster ... is there some peculiarity in
> psycopg2 that could be causing slowdown? Are these performance results
> typical? Any suggestions on what to try from here? I don't think my
> code/queries are inherently slow, but I'm not a DBA or a very accomplished
> Python developer, so I could be wrong.
> 
> Any advice is appreciated.

In general, if you do bulk insert into a large table, you should consider
turning off indexing on the table and recreate/update the indexes in one
go afterwards.

But regardless of this detail, I think you should consider a filesystem
based approach. This is going to be a lot faster than using a
database to store the source code line by line. You can still use
a database for the administration and indexing of the data, e.g.
by storing a hash of each line in the database.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 06 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From thomasvangurp at gmail.com  Fri Feb  6 07:30:56 2009
From: thomasvangurp at gmail.com (thomasvangurp at gmail.com)
Date: Fri, 6 Feb 2009 04:30:56 -0800 (PST)
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
	<gmej72$heu$1@ger.gmane.org>
	<mailman.8869.1233837571.3487.python-list@python.org>
Message-ID: <5ea62aa0-5e5a-4faf-9c1f-dde84f01f643@r41g2000prr.googlegroups.com>

Thanks a lot for all the responses. I'll move back to Python 2.5 for
compatibility with SciPY and some other third party packages.
I'll leave the compilation process for some other day, for now I'm a
happy user, mayve In the future I would like to contribute to the
developmental process..


From Olivier.Darge at gmail.com  Fri Feb  6 07:37:54 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Fri, 6 Feb 2009 04:37:54 -0800 (PST)
Subject: What is difference between ADO and RDO
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
Message-ID: <a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>

On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
> Explain ADO and RDO

RU a bot ?

Olivier


From agile.scrapping3 at gmail.com  Fri Feb  6 07:59:19 2009
From: agile.scrapping3 at gmail.com (agile)
Date: Fri, 6 Feb 2009 04:59:19 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com> 
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com> 
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<498363C0.5070909@gmail.com>
	<mailman.8399.1233348883.3487.python-list@python.org>
Message-ID: <a495b213-b509-49ff-b36b-80ce67cb103d@q30g2000prq.googlegroups.com>

On Jan 31, 1:54?am, Christian Heimes <li... at cheimes.de> wrote:
> Michael Torrie schrieb:
>
> >> It all depends on implementation, I think even we can make "C" object
> >> oriented with proper implementation.
>
> > Indeed, any code based on gobject libraries can be object-oriented in
> > design and function.
>
> The Python C API is a good example for well designed and object oriented
> C code.
>
> Christian

hello


From Krzysztof.Retel at googlemail.com  Fri Feb  6 08:15:30 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Fri, 6 Feb 2009 05:15:30 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com> 
	<471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>
Message-ID: <8605eb07-4995-4d96-a118-c5fa4565cd6c@b38g2000prf.googlegroups.com>

On Feb 5, 11:51?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 3:35?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
> > On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > > > Lionel wrote:
>
> > > > ?> Hello,
> > > > ?> I have data stored in binary files. Some of these files are
> > > > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > > > ?> numbers where the first 32 bits of the file is the real component, the
> > > > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > > > ?> of the second number, etc.
> > > > ?>
> > > > ?> I'd like to be able to read in just the real components, load them
> > > > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > > > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > > > ?> in seperate arrays, they cannot be in a single array of complex
> > > > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > > > ?> though, because of the size of the files.
> > > > ?>
> > > > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > > > ?> complex numbers which I then loop over and load into the real/
> > > > ?> imaginary arrays as follows:
> > > > ?>
> > > > ?>
> > > > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > > > ?> numpy.float32)
> > > > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > > > ?> numpy.float32)
> > > > ?>
> > > > ?> ? ? ? ? floatData = array.array('f')
> > > > ?>
> > > > ?> ? ? ? ? for CurrentRow in range(Rows):
> > > > ?>
> > > > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > > > ?>
> > > > ?> ? ? ? ? ? ? position = 0
> > > > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > > > ?>
> > > > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > > > ?> floatData[position]
> > > > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > > > ?> floatData[position+1]
> > > > ?> ? ? ? ? ? ? ? ? position = position + 2
> > > > ?>
> > > > ?>
> > > > ?> The above code works but is much too slow. If I comment out the body
> > > > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > > > ?> perfectly adequate i.e. function call overhead associated with the
> > > > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > > > ?> time-consuming are the simple assignment statements in the
> > > > ?> "CurrentColumn" for-loop.
> > > > ?>
> > > > [snip]
> > > > Try array slicing. floatData[0::2] will return the real parts and
> > > > floatData[1::2] will return the imaginary parts. You'll have to read up
> > > > how to assign to a slice of the numpy array (it might be
> > > > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > > > :] = real_parts").
>
> > > > BTW, it's not the function call overhead of fromfile() which takes the
> > > > time, but actually reading data from the file.
>
> > > Very nice! I like that! I'll post the improvement (if any).
>
> > > L- Hide quoted text -
>
> > > - Show quoted text -
>
> > Okay, the following:
>
> > ? ? ? ? ? ? self._realData[CurrentRow] ? ? ?= floatData[0::2]
> > ? ? ? ? ? ? self._imaginaryData[CurrentRow] = floatData[1::2]
>
> > gives a 3.5x improvement in execution speed over the original that I
> > posted. That's much better. Thank you for the suggestion.
>
> > L- Hide quoted text -
>
> > - Show quoted text -
>
> Correction: improvement is around 7-8x.

I had similar issues while Slicing Network packets (TCP/UDP) on a real
time basis.
I was using 're' and found it a lot more time and resource consuming,
than 'normal' string slicing as suggested by MRAB.

K


From grahn+nntp at snipabacken.se  Fri Feb  6 08:17:29 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 6 Feb 2009 13:17:29 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>

On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar265 at gmail.com> wrote:
> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.

That does not follow. To analyze a text, the worst possible starting
point is one variable for each character (what would you call them --
character_1, character_2, ... character_65802 ?)

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From Slaunger at gmail.com  Fri Feb  6 08:20:08 2009
From: Slaunger at gmail.com (Slaunger)
Date: Fri, 6 Feb 2009 05:20:08 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com> 
	<471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>
Message-ID: <77b8d066-0634-4a68-bd9a-a0a44079564c@r10g2000prf.googlegroups.com>


You might also want to have a look at a numpy memmap viewed as a
recarray.

from numpy import dtype, memmap, recarray
# Define your record in the file, 4bytes for the real value,
# and 4 bytes for the imaginary (assuming Little Endian repr)
descriptor = dtype([("r", "<f4"), ("i", "<f4")])
# Now typecast a memap (a memory efficient array) onto the file in
read only mode
# Viewing it as a recarray means the attributes data.r and data.i are
acessible as
# ordinary numpy array
data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
print "First 100 real values:", data.r[:100]

--Slaunger


From google at mrabarnett.plus.com  Fri Feb  6 08:24:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 13:24:53 +0000
Subject: Question on Strings
In-Reply-To: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <498C3A25.8010605@mrabarnett.plus.com>

John Machin wrote:
 > On Feb 6, 9:24 pm, Chris Rebert <c... at rebertia.com> wrote:
 >> On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
 >>
 >> <soft_sm... at yahoo.com> wrote:
 >>
 >>> Hi,
 >>> Excuse me if this is a repeat question!
 >>> I just wanted to know how are strings represented in python?
 >>> I need to know in terms of:
 >>> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?
 >
 > Neither.
 >
 >> IIRC, Depends on what the build settings were when CPython was
 >> compiled. UTF-16 is the default.
 >
 > Unicode strings are held as arrays of 16-bit numbers or 32-bit numbers
 > [of which only 21 are used]. If you must use an acronym, use UCS-2 or
 > UCS-4.
 >
 > The UTF-n siblings are *external* representations.
 > 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
 > 3.x: an_str_object.decode('UTF-16') -> a_bytes_object
 >
 > By the way, has anyone come up with a name for the shifting effect
 > observed above on str, and also with repr, range, and the iter*
 > family? If not, I suggest that the language's association with the
 > best of English humour be widened so that it be dubbed the "Mad
 > Hatter's Tea Party" effect.
 >
Bitwise shifts and rotates are collectively referred to as skew
operations. I therefore suggest the term "skewing". :-)


From pc at p-cos.net  Fri Feb  6 08:32:21 2009
From: pc at p-cos.net (Pascal Costanza)
Date: Fri, 06 Feb 2009 14:32:21 +0100
Subject: programming by evolution?
In-Reply-To: <03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <6v2sf4Fhuh4mU1@mid.individual.net>

Xah Lee wrote:
> Pascal Constanza is a Common Lisp fanatic.

It's Costanza, not Constanza.


Thank you,
Pascal

-- 
ELS'09: http://www.european-lisp-symposium.org/
My website: http://p-cos.net
Common Lisp Document Repository: http://cdr.eurolisp.org
Closer to MOP & ContextL: http://common-lisp.net/project/closer/


From kdawg44 at gmail.com  Fri Feb  6 08:43:33 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Fri, 6 Feb 2009 08:43:33 -0500
Subject: WIn32api
Message-ID: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>

Hi,

I have a python script that I want to run in the system tray and system tray
only (windows system).  I am looking at the win32gui_taskbar.py demo file
but am having trouble making sense of what parts do.  I understand what the
whole does but I want to actually learn what it is doing so I can apply it,
not just copy and paste parts to make it work the way I want.

I have searched for some kind of explanation or tutorial on this and have
come up empty.  Is there anything out there?

Thanks.

Kevin
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From noama at answers.com  Fri Feb  6 08:56:03 2009
From: noama at answers.com (Noam Aigerman)
Date: Fri, 6 Feb 2009 15:56:03 +0200
Subject: Distributing simple tasks
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

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From mail at microcorp.co.za  Fri Feb  6 08:56:11 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 15:56:11 +0200
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <002201c98862$ac137a60$0d00a8c0@hendrik>

"John Machin" <s..n at le..n.net> wrote:

>By the way, has anyone come up with a name for the shifting effect
>observed above on str, and also with repr, range, and the iter*
>family? If not, I suggest that the language's association with the
>best of English humour be widened so that it be dubbed the "Mad
>Hatter's Tea Party" effect.

The MHTP effect.

Sounds educated, almost like
a network protocol.

+1

- Hendrik





From traef at ebasedsecurity.com  Fri Feb  6 09:01:02 2009
From: traef at ebasedsecurity.com (Thomas Raef)
Date: Fri, 6 Feb 2009 08:01:02 -0600
Subject: Distributing simple tasks
Message-ID: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>

 

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

 

I would suggest maybe a separate queue machine that would hand out each
"next" function. That way if one machine takes a little longer, the
faster machine can keep picking off functions and running them, while
the slower machine can finish it's task.

 

Just a thought.

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From gh at ghaering.de  Fri Feb  6 09:01:20 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 06 Feb 2009 15:01:20 +0100
Subject: updating nntplib
In-Reply-To: <20090205224036.GH29170@subspacefield.org>
References: <20090205224036.GH29170@subspacefield.org>
Message-ID: <gmhfr4$la4$1@ger.gmane.org>

Travis wrote:
> Hello all,
> 
> There are some notable deficiencies in nntlib.  Here are two: [...]

Be sure to add a bug report/patch to the Python bug tracker.

http://bugs.python.org/

Anything else will most likely be overlooked or forgotten.

-- Gerhard



From noama at answers.com  Fri Feb  6 09:06:08 2009
From: noama at answers.com (Noam Aigerman)
Date: Fri, 6 Feb 2009 16:06:08 +0200
Subject: Distributing simple tasks
In-Reply-To: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>
References: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00A91@jermail1.atomant.net>

Hi,

The delta between the finishing times of each machine is insignificant
compared to the actual runtime, thus I don't feel it's necessary at the
moment. Anyway, I want to keep it simple until I understand how to
distribute tasks J

Thanks!

 

From: Thomas Raef [mailto:traef at ebasedsecurity.com] 
Sent: Friday, February 06, 2009 4:01 PM
To: Noam Aigerman; python-list at python.org
Subject: RE: Distributing simple tasks

 

 

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

 

I would suggest maybe a separate queue machine that would hand out each
"next" function. That way if one machine takes a little longer, the
faster machine can keep picking off functions and running them, while
the slower machine can finish it's task.

 

Just a thought.

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From paul at subsignal.org  Fri Feb  6 09:28:15 2009
From: paul at subsignal.org (paul)
Date: Fri, 06 Feb 2009 15:28:15 +0100
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <mailman.8980.1233928765.3487.python-announce-list@python.org>
References: <mailman.8980.1233928765.3487.python-announce-list@python.org>
Message-ID: <gmhhd8$qcv$1@ger.gmane.org>

greg schrieb:
> SuPy 1.0
> --------
> 
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
Great, will give it a try.

> 
>   http://www.cosc.canterbury.ac.nz/SuPy/
I think you meant to write http://www.cosc.canterbury.ac.nz/~greg/SuPy/

> 
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.

cheers
  Paul




From mmcclaf at gmail.com  Fri Feb  6 09:30:57 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 06:30:57 -0800 (PST)
Subject: Using cPickle
Message-ID: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>

Hi there,

I have to make a small database using cPickle. I'm having troubles
trying to read in the information if it's more than one line. I'm
pretty sure it's in the line "for line in stuff:" Can anyone help me
out? Basically the end result is wanting it to look something like
what is down below when list is typed in:

Last name                 First Name                Email Address
Doe                          John
john at doe.com


[code]
# @author: Ocdt Murray McClafferty 24656
# This will manage a small database using the cPickle module.
# It must maintain a list of last names, first names and email
addresses, and must let a user interact with the program

#
#!usr/bin/python
# -*- coding: utf-8 -*-

import sys
import cPickle

#
format = '%s             %s                  %s'

try:
	filename = sys.argv[1]
	input = open(filename, 'r')

except IOError:
	print 'File is not available, will create a new file now'
	lastName='Last Name'
	firstName='First Name'
	email= 'Email'
	#input.close()
	output=open (filename, 'w')
	total = format%(lastName, firstName, email)
	cPickle.dump(total,output)
	#cPickle.dump(firstName,output)
	#cPickle.dump(email,output)
	output.close()
except EOFError:
	print 'File is empty'

#datas = cPickle.load(input)

while True:
	command=sys.stdin.readline()[:-1]
	if command=='list': #lists the data in the file
		input = open(filename, 'r')
		stuff=cPickle.load(input)
		for line in stuff:
			#firstName=cPickle.load(input)
			#email=cPickle.load(input)
			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
(email).rjust(20)
			stuff=cPickle.load(input)
			print stuff
			print line

		input.close()

	if command=='exit' or command=='quit' : #NEVER forget the exit!!!
		print 'Save changes? y for Yes, n for No'
		commandSave=sys.stdin.readline()[:-1]
		if commandSave =='y': #if the user wants to save
			output=open(filename, 'w')
			cPickle.dump(work,output)
			output.close()
			sys.exit(0)
		if commandSave =='n': #no save
			input.close()
			sys.exit(0)

	if command=='add': #adds an entity to the file
		print 'Last name?'
		lastName=sys.stdin.readline()[:-1]
		print 'First name?'
		firstName=sys.stdin.readline()[:-1]
		print 'Email address?'
		email=sys.stdin.readline()[:-1]
		work = format%(lastName, firstName, email)
		#output=open(filename, 'w')
		#data=cPickle.load(output)
		#data.append(work)
		#output.close()
		output=open(filename, 'a')
		cPickle.dump(work,output)
		output.close()

[/code]

All help would be appreciated. I am new to Python and this seems to be
quite a challenge for me.


From greywine at gmail.com  Fri Feb  6 09:36:00 2009
From: greywine at gmail.com (greywine at gmail.com)
Date: Fri, 6 Feb 2009 06:36:00 -0800 (PST)
Subject: self-aware list of objects able to sense constituent member 
	alterations?
References: <3043ae5c-0168-4249-8a21-63d0268b36f1@k36g2000pri.googlegroups.com>
	<mailman.8186.1233135479.3487.python-list@python.org>
Message-ID: <6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>

On Jan 28, 4:37?am, John O'Hagan <m... at johnohagan.com> wrote:
> On Tue, 27 Jan 2009, Reckoner wrote:
> > I'm not sure this is possible, but I would like to have
> > a list of ?objects
>
> > A=[a,b,c,d,...,z]
>
> > where, ?in the midst of a lot of processing I might do something like,
>
> > A[0].do_something_which_changes_the_properties()
>
> > which alter the properties of the object 'a'.
>
> > The trick is that I would like A to be mysteriously aware that
> > something about the ?object 'a' has changed so that when I revisit A,
> > I will know that the other items in the list need to be refreshed to
> > reflect the changes in A as a result of changing 'a'.
>
> > Even better would be to automatically percolate the subsequent changes
> > that resulted from altering 'a' for the rest of the items in the list.
>
> [...]
>
> Interesting question.
>
> Maybe this is too simple for your purpose (or maybe just wrong!), but could
> you subclass list and give it an "update" method which keeps a dictionary of
> the state of its members and/or calls another method that makes the
> appropriate changes in the other members when a change occurs, something
> like:
>
> class SelfAwareList(list):
>
> ? ? state_dict = {}
>
> ? ? def update(self):
> ? ? ? ? for i in self:
> ? ? ? ? ? ? if i.state == 'some_condition':
> ? ? ? ? ? ? ? ? self.do_stuff_to_other_members()
> ? ? ? ? ? ? self.state_dict[i] = i.state
>
> ? ? def do_stuff_to_other_members(self):
> ? ? ? ? print 'doing stuff...'
>
> ?
>
> You could manually call update() on the SelfAwareList instance after calling a
> method on a SelfAwareList member, or even build it into the members' methods
> so that it was automatic.
>
> HTH,
>
> John

Hi Reckoner & John O'Hagan,

Great thread, very interesting.

John, I haven't seen anything like your class that uses list instead
of object and refers to state directly (i.state in self).  Could you
elaborate?  Here would be my implementation of your idea:

class SelfAwareList2(object):

    def __init__(self, l):
        self.l = l
        self.changed = [False for element in l]

    def __str__(self):
        return str(self.l)

    def update(self, index, value):
        self.l[index] = value
        self.changed[index] = True

    def do_stuff_to_other_members(self):
        for i in self.changed:
            if i==False:
                self.l[i] += 1

Here you can print and whenever you update your list, self.changed
keeps track of what changed.  Later on you can call do_stuff_to_others
which in this case adds 1 to each other element.

I assume that your class replaces the awkwardness of l.update(0, 5)
with l[0] = 5, but I can't quite wrap my mind around it.

Luther.


From invalid at invalid  Fri Feb  6 09:48:23 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 06 Feb 2009 08:48:23 -0600
Subject: urllib2 performance on windows, usb connection
References: <gmgp38$m2s$00$1@news.t-online.com>
	<498beb5a$0$3305$9b622d9e@news.freenet.de>
Message-ID: <IvOdncBvN9Uq0BHUnZ2dnUVZ_t7inZ2d@posted.visi>

On 2009-02-06, Martin v. L?wis <martin at v.loewis.de> wrote:

> To investigate further, you might drop the write operating,
> and measure only source.read(). If that is slower, then, for
> some reason, the network speed is bad on Windows. Maybe you
> have the network interfaces misconfigured? Maybe you are using
> wireless on Windows, but cable on Linux? Maybe you have some
> network filtering software running on Windows?


> Maybe it's just that Windows sucks?-)

MAYBE?  

Good one.

A friend of mine signed up for 6MB/s DSL a while back.  She set
up the DSL modem/WAP/firewall according to QWest's instructions
and it basically worked, but her download speeds were much
slower than they should have been.  It turns out that the
Windows drivers for the Intel WiFi chipset used in many laptops
completely and utterly sucked.  Her laptop and my laptop used
the same WiFi chipset and neither could sustain more than about
1MB/s speeds when running Windows. I know my Windows setup was
running no firewall or virus scanner software.  Connecting to
the DSL modem via Ethernet cable brought the download speeds up
to 6MB/s.

When Linux was running on either laptop, the WiFi link ran at
full speed, and DSL was the bottleneck as it should have been.
Windows support was just plain broken for one of the most
popular WiFi chipsets (the Intel Pro 2200BG).

-- 
Grant Edwards                   grante             Yow! I'm wearing PAMPERS!!
                                  at               
                               visi.com            


From christian at dowski.com  Fri Feb  6 10:17:18 2009
From: christian at dowski.com (Christian)
Date: Fri, 6 Feb 2009 07:17:18 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <acbbd3ba-66a3-4cb7-8e3b-d680f26d263d@a39g2000prl.googlegroups.com>

On Feb 1, 5:56 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> Is SQLalchemy the best / most popular database wrapper ?
> Are there any alternatives ?

As others have confirmed, SQLAlchemy is far and away the most popular
Python ORM.

Another one to have a look at though is Dejavu (http://www.aminus.net/
dejavu).  The user community isn't nearly as large but the software
itself is quite good.  One of its distinctives is that you can treat
multiple disparate data stores as one cohesive relational structure.
It also isn't bound to SQL databases.  There are storage
implementations included for file system, Shelve and in-memory
storage.  The 2.0 alpha code in trunk also has a memcached storage
implementation.

HTH,

Christian
http://www.dowski.com


From christian at dowski.com  Fri Feb  6 10:24:05 2009
From: christian at dowski.com (Christian)
Date: Fri, 6 Feb 2009 07:24:05 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org> 
	<acbbd3ba-66a3-4cb7-8e3b-d680f26d263d@a39g2000prl.googlegroups.com>
Message-ID: <a776fdff-cc61-464d-a4d9-73382cb5770c@s9g2000prg.googlegroups.com>

On Feb 6, 10:17 am, Christian <christ... at dowski.com> wrote:
> One of its distinctives is that ...

Not sure how I forgot this, but Dejavu also lets you write your
datastore queries in a LINQ-like syntax.  Robert Brewer, the author,
is giving a talk [1] about it at this year's PyCon in the US.

Christian
http://www.dowski.com

[1] http://pycon.org/2009/conference/talks/#proposal_link_91


From steve at holdenweb.com  Fri Feb  6 10:25:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 10:25:57 -0500
Subject: Using cPickle
In-Reply-To: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
Message-ID: <gmhkq7$a0m$1@ger.gmane.org>

mmcclaf wrote:
> Hi there,
> 
> I have to make a small database using cPickle. I'm having troubles
> trying to read in the information if it's more than one line. I'm
> pretty sure it's in the line "for line in stuff:" Can anyone help me
> out? Basically the end result is wanting it to look something like
> what is down below when list is typed in:
> 
> Last name                 First Name                Email Address
> Doe                          John
> john at doe.com
> 
> 
> [code]
> # @author: Ocdt Murray McClafferty 24656
> # This will manage a small database using the cPickle module.
> # It must maintain a list of last names, first names and email
> addresses, and must let a user interact with the program
> 
> #
> #!usr/bin/python
> # -*- coding: utf-8 -*-
> 
> import sys
> import cPickle
> 
> #
> format = '%s             %s                  %s'
> 
> try:
> 	filename = sys.argv[1]
> 	input = open(filename, 'r')
> 
> except IOError:
> 	print 'File is not available, will create a new file now'
> 	lastName='Last Name'
> 	firstName='First Name'
> 	email= 'Email'
> 	#input.close()
> 	output=open (filename, 'w')
> 	total = format%(lastName, firstName, email)
> 	cPickle.dump(total,output)
> 	#cPickle.dump(firstName,output)
> 	#cPickle.dump(email,output)
> 	output.close()
> except EOFError:
> 	print 'File is empty'
> 
> #datas = cPickle.load(input)
> 
> while True:
> 	command=sys.stdin.readline()[:-1]
> 	if command=='list': #lists the data in the file
> 		input = open(filename, 'r')
> 		stuff=cPickle.load(input)
> 		for line in stuff:
> 			#firstName=cPickle.load(input)
> 			#email=cPickle.load(input)
> 			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> (email).rjust(20)
> 			stuff=cPickle.load(input)
> 			print stuff
> 			print line
> 
> 		input.close()
> 
> 	if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> 		print 'Save changes? y for Yes, n for No'
> 		commandSave=sys.stdin.readline()[:-1]
> 		if commandSave =='y': #if the user wants to save
> 			output=open(filename, 'w')
> 			cPickle.dump(work,output)
> 			output.close()
> 			sys.exit(0)
> 		if commandSave =='n': #no save
> 			input.close()
> 			sys.exit(0)
> 
> 	if command=='add': #adds an entity to the file
> 		print 'Last name?'
> 		lastName=sys.stdin.readline()[:-1]
> 		print 'First name?'
> 		firstName=sys.stdin.readline()[:-1]
> 		print 'Email address?'
> 		email=sys.stdin.readline()[:-1]
> 		work = format%(lastName, firstName, email)
> 		#output=open(filename, 'w')
> 		#data=cPickle.load(output)
> 		#data.append(work)
> 		#output.close()
> 		output=open(filename, 'a')
> 		cPickle.dump(work,output)
> 		output.close()
> 
> [/code]
> 
> All help would be appreciated. I am new to Python and this seems to be
> quite a challenge for me.

Make sure you use modes "rb" and "wb" when you open the pickle files. If
you are running on Windows this can make a difference.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at spvi.com  Fri Feb  6 10:37:42 2009
From: steve at spvi.com (Steve Spicklemire)
Date: Fri, 6 Feb 2009 10:37:42 -0500
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <6v1u4pFho98dU1@mid.individual.net>
References: <6v1u4pFho98dU1@mid.individual.net>
Message-ID: <0179B31A-9FF1-46C9-990A-EB5F16EFB825@spvi.com>

Hi Greg,

Hm... "SuPy not found on this sever." ;-(

Is there a better URL.. or did I just check too soon?

thanks,
-steve

On Feb 5, 2009, at 11:56 PM, greg wrote:

> SuPy 1.0
> --------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
>
>   http://www.cosc.canterbury.ac.nz/SuPy/
>
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.
>
> -- 
> Greg Ewing
> greg.ewing at canterbury.ac.nz
> --
> http://mail.python.org/mailman/listinfo/python-announce-list
>
>        Support the Python Software Foundation:
>        http://www.python.org/psf/donations.html



From linuxguy123 at gmail.com  Fri Feb  6 10:49:04 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Fri, 06 Feb 2009 08:49:04 -0700
Subject: Object explorer for python ?
Message-ID: <1233935344.3876.9.camel@localhost.localdomain>

Is there a (stand alone ?) object explorer for python objects such as
the PyQt4 collection ?

How else could I find out what is in PyQt4.QtCore, .QtGui
and .QtWebKit ?

Thanks 



From benjamin.kaplan at case.edu  Fri Feb  6 10:55:09 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 6 Feb 2009 10:55:09 -0500
Subject: Python Power Point Slides
In-Reply-To: <gmh99r$unb$1@ger.gmane.org>
References: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
	<gmh99r$unb$1@ger.gmane.org>
Message-ID: <ec96e1390902060755yc04434fv2c13558ed1dca89d@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:09 AM, Steve Holden <steve at holdenweb.com> wrote:

> Tehseen Siddiqui wrote:
> > ------------------------------------------------------------------------
> >
> > DISCLAIMER: The information in this email is confidential and may be
> > legally privileged. [... etc.]
>
> What information?



We can't tell you. It's confidential. :)
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From notvalid2 at sbcglobal.net  Fri Feb  6 11:01:54 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 06 Feb 2009 08:01:54 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8522.1233496608.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
	<mailman.8522.1233496608.3487.python-list@python.org>
Message-ID: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>

...
>>
> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
> point out that with the right search string you could have answered the
> question for yourself.
> 
> Since you didn't appear to know that Google allowed you to search a
> single site (something I perhaps take for granted) I am glad that point
> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
> Internet great? ;-)
> 
> regards
>  Steve
> 
Yes, I agree on the internet, and I now see "letme...com. So, I've now tried 
in my browser's link window:
site:effbot.org/tkinterbook tkfiledialog, and get "site is not a registered 
protocol."

If I put the "site:..." in the Google window,it works fine. In fact it's 
quite clever.

I thought some months ago, I found Google commands that would operate in the 
browser link window. Guess not.

BTW, isn't there an O'Reilly book on Google hacks of this sort? Where else 
does one find out about these Google tools?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From manu3d at gmail.com  Fri Feb  6 11:11:55 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 6 Feb 2009 08:11:55 -0800 (PST)
Subject: thread-local data
Message-ID: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>

Hi everybody,

Assuming a snippet such as:

threadLocalData = threading.local()
threadLocalData.myDictionary = self.myDictionary

is it correct to say that threadLocalData.myDictionary is NOT a thread-
local -copy- of self.myDictionary but it's actually pointing to the
same object?

If that's the case, and assuming I want to iterate over the dictionary
without it changing under my nose while I'm in the loop, would it be
better to encase the whole loop in lock-protected section or  would it
be better to make a copy of the dictionary first and then iterate over
that one? Given that in this particular thread I do not want to modify
the dictionary, conceptually a copy would work. But would making
thread-local copy be just as slow as making the whole loop thread
safe?

Thanks for your help!

Manu




From gherron at islandtraining.com  Fri Feb  6 11:27:14 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 06 Feb 2009 08:27:14 -0800
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <6v1u4pFho98dU1@mid.individual.net>
References: <6v1u4pFho98dU1@mid.individual.net>
Message-ID: <498C64E2.1050204@islandtraining.com>

greg wrote:
> SuPy 1.0
> --------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
>
>   http://www.cosc.canterbury.ac.nz/SuPy/


That URL fails with a 404 - not found.  (At least for me at this moment
in time.)


>
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.
>



From kdawg44 at gmail.com  Fri Feb  6 11:28:07 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Fri, 6 Feb 2009 11:28:07 -0500
Subject: WIn32api
In-Reply-To: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
References: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
Message-ID: <5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>

I have come up with what I need and will try tweaking some things that
hopefully will help me learn what some of this stuff does.  In the meantime,
I am having an issue:


class *KeepAlive*(threading.Thread):

    def *__init__*(*self*):

        *self*.count = 0

        *self*.ie=win32com.client.Dispatch(*'internetexplorer.application'*)

        *self*.ie.Visible=0

        threading.Thread.__init__(*self*)

    def *run*(*self*):

        *self*.ie.Navigate(URL)

        sleep(5)

        while True:

            sleep(1)

            *self*.count += 1

            *self*.timeLeft = str((300 - *self*.count)/60) + *":"* + str((
300 - *self*.count)%60) + *" until next refresh"
*

            print *self*.timeLeft

            if *self*.count == 300:

                *self*.ie.Refresh()

                *self*.count = 0



This works if I call run() specifically.  But when I try to initiate the
thread with .start() I get the following error

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 486, in __bootstrap_inner
    self.run()
  File "C:\app.py", line 104, in run
    self.ie.Navigate(URL)
  File "C:\Python25\lib\site-packages\win32com\client\dynamic.py", line 500,
in
__getattr__
    raise AttributeError, "%s.%s" % (self._username_, attr)
AttributeError: internetexplorer.application.Navigate

What does this mean?  Why is it only happening when I am trying to do this
in a thread?

Thanks for any help.



Kevin
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From kyosohma at gmail.com  Fri Feb  6 11:30:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 6 Feb 2009 08:30:26 -0800 (PST)
Subject: Object explorer for python ?
References: <mailman.8987.1233935355.3487.python-list@python.org>
Message-ID: <fc54b384-a753-40fa-a24e-3a3e53366588@q30g2000prq.googlegroups.com>

On Feb 6, 9:49?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> Is there a (stand alone ?) object explorer for python objects such as
> the PyQt4 collection ?
>
> How else could I find out what is in PyQt4.QtCore, .QtGui
> and .QtWebKit ?
>
> Thanks

I like WingWare for this sort of thing, but you might like eric. Links
are below:

http://eric-ide.python-projects.org/index.html
http://www.wingware.com/

Other editors: http://wiki.python.org/moin/PythonEditors

Mike


From google at mrabarnett.plus.com  Fri Feb  6 11:45:07 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 16:45:07 +0000
Subject: Tkinter w.pack()?
In-Reply-To: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
Message-ID: <498C6913.6020201@mrabarnett.plus.com>

W. eWatson wrote:
> ...
>>>
>> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
>> point out that with the right search string you could have answered the
>> question for yourself.
>>
>> Since you didn't appear to know that Google allowed you to search a
>> single site (something I perhaps take for granted) I am glad that point
>> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
>> Internet great? ;-)
>>
>> regards
>>  Steve
>>
> Yes, I agree on the internet, and I now see "letme...com. So, I've now 
> tried in my browser's link window:
> site:effbot.org/tkinterbook tkfiledialog, and get "site is not a 
> registered protocol."
> 
> If I put the "site:..." in the Google window,it works fine. In fact it's 
> quite clever.
> 
> I thought some months ago, I found Google commands that would operate in 
> the browser link window. Guess not.
> 
> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where 
> else does one find out about these Google tools?
> 
Google? :-)

http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861



From google at mrabarnett.plus.com  Fri Feb  6 11:56:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 16:56:40 +0000
Subject: thread-local data
In-Reply-To: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
Message-ID: <498C6BC8.5020103@mrabarnett.plus.com>

Emanuele D'Arrigo wrote:
 > Hi everybody,
 >
 > Assuming a snippet such as:
 >
 > threadLocalData = threading.local()
 > threadLocalData.myDictionary = self.myDictionary
 >
 > is it correct to say that threadLocalData.myDictionary is NOT a thread-
 > local -copy- of self.myDictionary but it's actually pointing to the
 > same object?
 >
 > If that's the case, and assuming I want to iterate over the dictionary
 > without it changing under my nose while I'm in the loop, would it be
 > better to encase the whole loop in lock-protected section or  would it
 > be better to make a copy of the dictionary first and then iterate over
 > that one? Given that in this particular thread I do not want to modify
 > the dictionary, conceptually a copy would work. But would making
 > thread-local copy be just as slow as making the whole loop thread
 > safe?
 >
It depends on how long it takes to iterate over the dict compared with
how long it takes to copy the dict. Other threads will/should be denied
access during the iteration/copying and therefore block, reducing
throughput.

I'd probably use the snapshot approach (take a copy).


From steve at holdenweb.com  Fri Feb  6 12:32:14 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 12:32:14 -0500
Subject: Tkinter w.pack()?
In-Reply-To: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
Message-ID: <gmhs70$65r$1@ger.gmane.org>

W. eWatson wrote:
> ...
>>>
>> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
>> point out that with the right search string you could have answered the
>> question for yourself.
>>
>> Since you didn't appear to know that Google allowed you to search a
>> single site (something I perhaps take for granted) I am glad that point
>> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
>> Internet great? ;-)
>>
>> regards
>>  Steve
>>
> Yes, I agree on the internet, and I now see "letme...com. So, I've now
> tried in my browser's link window:
> site:effbot.org/tkinterbook tkfiledialog, and get "site is not a
> registered protocol."
> 
> If I put the "site:..." in the Google window,it works fine. In fact it's
> quite clever.
> 
> I thought some months ago, I found Google commands that would operate in
> the browser link window. Guess not.
> 
> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where
> else does one find out about these Google tools?
> 
I seem to pick them up as I go along. This group is actually a great
source of google-fu enhancements - I believe this is where I found out
about "letmegooglethatforyou".

Of course you can do any Google search and then look at what Google puts
in your Location: bar. Saving that URL means you can repeat the same
search later, but you can also analyze it to find out about some useful
tricks (and "letme..." uses the same everything except for the domain
name). So your site search would also work with

  http://www.google.com/search?q=site%3Aeffbot.org+tkinterbook%2Bpack

Of course it would be relatively easy to write a Python program that
used the browser module to do this kind of search ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From richardlev at gmail.com  Fri Feb  6 12:47:06 2009
From: richardlev at gmail.com (Richard Levasseur)
Date: Fri, 6 Feb 2009 09:47:06 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8894.1233849778.3487.python-list@python.org>
Message-ID: <e3215748-2e10-4a32-91ed-ae8b959b46b6@u18g2000pro.googlegroups.com>

On Feb 5, 8:02?am, Dan Upton <up... at virginia.edu> wrote:
> On Thu, Feb 5, 2009 at 11:00 AM, mk <mrk... at gmail.com> wrote:
>
> > (duck)
>
> > 542 comp.lang.python rtfm
>
> > 467 comp.lang.python shut+up
>
> > 263 comp.lang.perl rtfm
>
> > 45 comp.lang.perl shut+up
>
> But over how many messages for each group? ?Wouldn't the percentage of
> messages containing those be more interesting than the raw number? ;p

As would the percent of threads that ultimately have "GIL" within the
last, oh, say 20% of their messages :)


From deets at nospam.web.de  Fri Feb  6 13:12:18 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:12:18 +0100
Subject: thread-local data
In-Reply-To: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
Message-ID: <6v3cs2Fhovi8U1@mid.uni-berlin.de>

Emanuele D'Arrigo schrieb:
> Hi everybody,
> 
> Assuming a snippet such as:
> 
> threadLocalData = threading.local()
> threadLocalData.myDictionary = self.myDictionary
> 
> is it correct to say that threadLocalData.myDictionary is NOT a thread-
> local -copy- of self.myDictionary but it's actually pointing to the
> same object?

Yes, it's pointing to the same object, and it thus makes the whole 
purpose of threadlocal moot. Use a global.

 > If that's the case, and assuming I want to iterate over the dictionary
 > without it changing under my nose while I'm in the loop, would it be
 > better to encase the whole loop in lock-protected section or  would it
 > be better to make a copy of the dictionary first and then iterate over
 > that one? Given that in this particular thread I do not want to modify
 > the dictionary, conceptually a copy would work. But would making
 > thread-local copy be just as slow as making the whole loop thread
 > safe?

As MRAB pointed out - it depends. My gut feeling on this is that the 
copy-approach is fastest. Or even faster, if you can cope with keys 
getting lost while processing them:


for key in self.myDictionary.keys():
     try:
        value = self.myDictionary[key]
     except KeyError:
        pass


Diez


From deets at nospam.web.de  Fri Feb  6 13:13:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:13:05 +0100
Subject: thread-local data
In-Reply-To: <6v3cs2Fhovi8U1@mid.uni-berlin.de>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
	<6v3cs2Fhovi8U1@mid.uni-berlin.de>
Message-ID: <6v3ctiFhovi8U2@mid.uni-berlin.de>

Diez B. Roggisch schrieb:
> Emanuele D'Arrigo schrieb:
>> Hi everybody,
>>
>> Assuming a snippet such as:
>>
>> threadLocalData = threading.local()
>> threadLocalData.myDictionary = self.myDictionary
>>
>> is it correct to say that threadLocalData.myDictionary is NOT a thread-
>> local -copy- of self.myDictionary but it's actually pointing to the
>> same object?
> 
> Yes, it's pointing to the same object, and it thus makes the whole 
> purpose of threadlocal moot. Use a global.

Scratch the "use a global" - that's of course nonsense. Use 
self.myDictionary directly, or wherever the dict comes from.

Diez


From tjreedy at udel.edu  Fri Feb  6 13:23:11 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:23:11 -0500
Subject: Question on Strings
In-Reply-To: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <gmhv6f$f7b$1@ger.gmane.org>

John Machin wrote:

> The UTF-n siblings are *external* representations.
> 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
> 3.x: an_str_object.decode('UTF-16') -> a_bytes_object

That should be .encode() to bytes, which is the coded form.
.decode is bytes => str/unicode



From tjreedy at udel.edu  Fri Feb  6 13:30:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:30:57 -0500
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <gmhvl1$h8f$1@ger.gmane.org>

Ken Elkabany wrote:
> Hello,
> 
> I am attempting to fully-simulate an 'int' object with a custom object 
> type. It is part of a library I am creating for python futures and 
> promises. Is there anyway such that type(my_object) can return <type 
> 'int'>? Or for that matter, any other primitive? I do not care how dirty 
> the solution might possibly be; Could there be a way through the C API? 
> Though I predict it will cause a mess with the interpreter.

type(o) == o.__class__

o.__class__ can only be rebound if and only if it is a user-class (heap 
type) and then only to another (compatible) user-class (heap type).



From deets at nospam.web.de  Fri Feb  6 13:31:10 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:31:10 +0100
Subject: i have an query regarding pyodbc
In-Reply-To: <519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
	<ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>
	<519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>
Message-ID: <6v3dveFhtbfjU1@mid.uni-berlin.de>

Rahul schrieb:
> On Feb 6, 3:53 pm, Rahul <r.warhe... at gmail.com> wrote:
>> On Feb 6, 11:27 am, Rahul <r.warhe... at gmail.com> wrote:
>>
>>
>>
>>> hello all,
>>> I have installed pyodbc on my red hat enterprise 4 linux machine but
>>> when i go to use that using statement,
>>> import pyodbc
>>> through python console it gives me error as
>>> ImportError : dynamic module does not define init function
>>> (initpyodbc)
>>> and when i do 'nm pyodbc.so' command i get output as
>>> [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
>>> 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
>>> __CTOR_END__
>>> 000014f8 d __CTOR_LIST__
>>>          w __cxa_finalize@@GLIBC_2.1.3
>>> 000004a8 t __do_global_ctors_aux
>>> 00000410 t __do_global_dtors_aux
>>> 000015f8 d __dso_handle
>>> 00001504 d __DTOR_END__
>>> 00001500 d __DTOR_LIST__
>>> 0000150c A _DYNAMIC
>>> 00001600 A _edata
>>> 00001604 A _end
>>> 000004d8 T _fini
>>> 0000046c t frame_dummy
>>> 000004f4 r __FRAME_END__
>>> 000015e8 A _GLOBAL_OFFSET_TABLE_
>>>          w __gmon_start__
>>> 000003b4 T _init
>>> 00001508 d __JCR_END__
>>> 00001508 d __JCR_LIST__
>>>          w _Jv_RegisterClasses
>>> 000015fc d p.0
>>> which means there is no init function.
>>> So what might be the cause for that?
>>> I have build that pyodbc twice.
>>> Any help regarding this will be greatly appreciated.
>>> Thanks & Regards
>>> Rahul
>> this problem was due to not proper building of pyodbc
> 
> Now my problem was,
> i have two versions of python installed at different locations but
> when i use import statement from psp pages
> it displays the error as
> ImportError : dynamic module does not define init function(initpyodbc)
> 
> this error was due to pointing to older version of python.
> 
> So, i want to know how to point my import statements to the new
> version of python.

The problem are not the imports, the problem is the used interpreter. 
How is PSP integrated into your webserver?

Diez


From Scott.Daniels at Acm.Org  Fri Feb  6 13:36:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 06 Feb 2009 10:36:37 -0800
Subject: What is difference between ADO and RDO
In-Reply-To: <a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
	<a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>
Message-ID: <dO2dnZHZepddHxHUnZ2dnUVZ_qadnZ2d@pdx.net>

OdarR wrote:
> On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
>> Explain ADO and RDO
> 
> RU a bot ?

I expect someone is experimenting with their spam generator.


From deets at nospam.web.de  Fri Feb  6 13:42:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:42:36 +0100
Subject: Have you ever thought to know your intelligence level?
In-Reply-To: <1f832722-d2f1-4596-a27c-69e666bbf6cd@y38g2000prg.googlegroups.com>
References: <29506468-3b1d-46c0-acba-15c4d5665954@x6g2000pre.googlegroups.com>
	<8f4ff01d-7660-4d71-b812-acb5acfb4671@u18g2000pro.googlegroups.com>
	<1f832722-d2f1-4596-a27c-69e666bbf6cd@y38g2000prg.googlegroups.com>
Message-ID: <6v3eksFhv2c3U1@mid.uni-berlin.de>

> 
> His IQ must suck considering all the spelling errors....or is that not
> also a measure of one's IQ?

I'm pretty sure there is a legasthenic nobel prize winner out there... 
so *if* it were a measure of IQ, it would make the whole affair even 
more braindead.

I'd rather say he is of limited intelligence because he tries to 
convince us that his spam actually *isn't* spam...

Diez


From tjreedy at udel.edu  Fri Feb  6 13:49:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:49:32 -0500
Subject: Distributing simple tasks
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
Message-ID: <gmi0nt$l9v$1@ger.gmane.org>

Noam Aigerman wrote:
> Hi,
> 
> Suppose I have an array of functions which I execute in threads (each 
> thread get a slice of the array, iterates over it and executes each 
> function in it?s slice one after the other). Now I want to distribute 
> these tasks between two machines, i.e give each machine half of the 
> slices and let it run them in threads as described above. Is there an 
> easy way, or an article on this matter you can point me to?

Here is a standard  approach that is slightly more general than you 
specified.  It will work with more than two cores or machines.

Write master/server program that reads data, listens to socket for calls 
from worker/client programs, splits work into multiple tasks, sends them 
out to workers, and collects and re-assembles the results.  After a 
timeout, it should be able to reassign tasks not returned.

Write worker/client program than calls master, gets task, completes it, 
and returns result.

Assume all data is on machine A.
Start master and worker on machine A.
Start worker(s) on other cores or machines.

You can either use socket module directly or use networking modules 
built on top of it.  Twisted and pyro are two that come to mind 
immediately.  I have seen code examples but do not remember where.

Note: I do not see any advantage to having multiple compute-bound 
threads, as you seem to describe.

Terry Jan Reedy



From aioe.org at technicalbloke.com  Fri Feb  6 13:50:05 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Fri, 06 Feb 2009 13:50:05 -0500
Subject: Returning a variable number of things...
Message-ID: <gmi0og$4cl$1@aioe.org>

Hi There,

I have a function that uses *args to accept a variable number of
parameters and I would like it to return a variable number of objects.

I could return a list but I would like to take advantage of tuple
unpacking with the return values e.g.

def unpack_struct( a_string, *args ):
  output_vars = []
  for each in *args:
    <<< build a list of output values >>>
  return <<< the tuple equivalent of this list >>>

ip, meat, zipcode = unpack_struct( "192.168.001.001Ham22132", 15, 3, 5 )

Thanks,


Roger.


From tjreedy at udel.edu  Fri Feb  6 13:54:07 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:54:07 -0500
Subject: updating nntplib
In-Reply-To: <gmhfr4$la4$1@ger.gmane.org>
References: <20090205224036.GH29170@subspacefield.org>
	<gmhfr4$la4$1@ger.gmane.org>
Message-ID: <gmi10g$m5c$1@ger.gmane.org>

Gerhard H?ring wrote:
> Travis wrote:
>> Hello all,
>>
>> There are some notable deficiencies in nntlib.  Here are two: [...]
> 
> Be sure to add a bug report/patch to the Python bug tracker.
> 
> http://bugs.python.org/
> 
> Anything else will most likely be overlooked or forgotten.

It is my impression that nntplib was and maybe still is a bit flakey on 
3.0.  3.0.1 will be out this month and may or may not have improvements. 
  I am fairly sure that updating it to a newer RFC would be welcome. 
Such upgrades have happened to other protocol modules when there has 
been someone willing to do the work.  Please do check the tracker for 
existing nntplib issues and add one if appropriate.

tjr



From clp2 at rebertia.com  Fri Feb  6 13:57:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 10:57:10 -0800
Subject: Returning a variable number of things...
In-Reply-To: <gmi0og$4cl$1@aioe.org>
References: <gmi0og$4cl$1@aioe.org>
Message-ID: <50697b2c0902061057h32ae0aes12ae96cad54cde6f@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:
> Hi There,
>
> I have a function that uses *args to accept a variable number of
> parameters and I would like it to return a variable number of objects.
>
> I could return a list but I would like to take advantage of tuple
> unpacking with the return values e.g.

Despite its name, tuple unpacking works with lists too.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Fri Feb  6 13:57:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 10:57:45 -0800
Subject: Returning a variable number of things...
In-Reply-To: <gmi0og$4cl$1@aioe.org>
References: <gmi0og$4cl$1@aioe.org>
Message-ID: <7a9c25c20902061057h251c459eg43d7ffd906996d9c@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:

> Hi There,
>
> I have a function that uses *args to accept a variable number of
> parameters and I would like it to return a variable number of objects.
>

> I could return a list but I would like to take advantage of tuple
> unpacking with the return values e.g.


Just return the list :)

It'll unpack any sequence, not just tuples.

--S
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From mmcclaf at gmail.com  Fri Feb  6 14:05:36 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 11:05:36 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
Message-ID: <4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>

On Feb 6, 10:25?am, Steve Holden <st... at holdenweb.com> wrote:
> mmcclaf wrote:
> > Hi there,
>
> > I have to make a small database using cPickle. I'm having troubles
> > trying to read in the information if it's more than one line. I'm
> > pretty sure it's in the line "for line in stuff:" Can anyone help me
> > out? Basically the end result is wanting it to look something like
> > what is down below when list is typed in:
>
> > Last name ? ? ? ? ? ? ? ? First Name ? ? ? ? ? ? ? ?Email Address
> > Doe ? ? ? ? ? ? ? ? ? ? ? ? ?John
> > j... at doe.com
>
> > [code]
> > # @author: Ocdt Murray McClafferty 24656
> > # This will manage a small database using the cPickle module.
> > # It must maintain a list of last names, first names and email
> > addresses, and must let a user interact with the program
>
> > #
> > #!usr/bin/python
> > # -*- coding: utf-8 -*-
>
> > import sys
> > import cPickle
>
> > #
> > format = '%s ? ? ? ? ? ? %s ? ? ? ? ? ? ? ? ?%s'
>
> > try:
> > ? ?filename = sys.argv[1]
> > ? ?input = open(filename, 'r')
>
> > except IOError:
> > ? ?print 'File is not available, will create a new file now'
> > ? ?lastName='Last Name'
> > ? ?firstName='First Name'
> > ? ?email= 'Email'
> > ? ?#input.close()
> > ? ?output=open (filename, 'w')
> > ? ?total = format%(lastName, firstName, email)
> > ? ?cPickle.dump(total,output)
> > ? ?#cPickle.dump(firstName,output)
> > ? ?#cPickle.dump(email,output)
> > ? ?output.close()
> > except EOFError:
> > ? ?print 'File is empty'
>
> > #datas = cPickle.load(input)
>
> > while True:
> > ? ?command=sys.stdin.readline()[:-1]
> > ? ?if command=='list': #lists the data in the file
> > ? ? ? ? ? ?input = open(filename, 'r')
> > ? ? ? ? ? ?stuff=cPickle.load(input)
> > ? ? ? ? ? ?for line in stuff:
> > ? ? ? ? ? ? ? ? ? ?#firstName=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?#email=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> > (email).rjust(20)
> > ? ? ? ? ? ? ? ? ? ?stuff=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?print stuff
> > ? ? ? ? ? ? ? ? ? ?print line
>
> > ? ? ? ? ? ?input.close()
>
> > ? ?if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> > ? ? ? ? ? ?print 'Save changes? y for Yes, n for No'
> > ? ? ? ? ? ?commandSave=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?if commandSave =='y': #if the user wants to save
> > ? ? ? ? ? ? ? ? ? ?output=open(filename, 'w')
> > ? ? ? ? ? ? ? ? ? ?cPickle.dump(work,output)
> > ? ? ? ? ? ? ? ? ? ?output.close()
> > ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> > ? ? ? ? ? ?if commandSave =='n': #no save
> > ? ? ? ? ? ? ? ? ? ?input.close()
> > ? ? ? ? ? ? ? ? ? ?sys.exit(0)
>
> > ? ?if command=='add': #adds an entity to the file
> > ? ? ? ? ? ?print 'Last name?'
> > ? ? ? ? ? ?lastName=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?print 'First name?'
> > ? ? ? ? ? ?firstName=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?print 'Email address?'
> > ? ? ? ? ? ?email=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?work = format%(lastName, firstName, email)
> > ? ? ? ? ? ?#output=open(filename, 'w')
> > ? ? ? ? ? ?#data=cPickle.load(output)
> > ? ? ? ? ? ?#data.append(work)
> > ? ? ? ? ? ?#output.close()
> > ? ? ? ? ? ?output=open(filename, 'a')
> > ? ? ? ? ? ?cPickle.dump(work,output)
> > ? ? ? ? ? ?output.close()
>
> > [/code]
>
> > All help would be appreciated. I am new to Python and this seems to be
> > quite a challenge for me.
>
> Make sure you use modes "rb" and "wb" when you open the pickle files. If
> you are running on Windows this can make a difference.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

I've tried both rb and wb as well as r and w, there appears to be no
difference in the running of the code.


From Olivier.Darge at gmail.com  Fri Feb  6 14:13:32 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Fri, 6 Feb 2009 11:13:32 -0800 (PST)
Subject: What is difference between ADO and RDO
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
	<a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com> 
	<dO2dnZHZepddHxHUnZ2dnUVZ_qadnZ2d@pdx.net>
Message-ID: <23ea9cc9-78d0-46d8-be1f-6dcd959c6b04@p36g2000prp.googlegroups.com>

On 6 f?v, 19:36, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> OdarR wrote:
> > On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
> >> Explain ADO and RDO
>
> > RU a bot ?
>
> I expect someone is experimenting with their spam generator.

An agile one :)

Olivier


From wimmersimon at googlemail.com  Fri Feb  6 14:34:58 2009
From: wimmersimon at googlemail.com (SiWi)
Date: Fri, 6 Feb 2009 11:34:58 -0800 (PST)
Subject: Parallel port interfacing in python on Vista x64
Message-ID: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>

I have done some googling on this topic, but I haven't found anything
thats really working on Vista x64.
The most promising result I found was the Inpout32.dll:
http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html
But when using some code like that, I can't measure I differing state
on my breadboard circurity:
from ctypes import windll
p = windll.inpout32
p.Inp32(0x378) #default 255(all high) on my pc
p.Out32(0x378, 0) #put all low on port 2-9

Is it even possible to interface the Parallel Port on Vista64, and if
so, how does one do that?


From otsaloma at cc.hut.fi  Fri Feb  6 14:39:51 2009
From: otsaloma at cc.hut.fi (Osmo Salomaa)
Date: Fri, 06 Feb 2009 21:39:51 +0200
Subject: Installation directory for extensions on Unix
Message-ID: <1233949191.3825.9.camel@stoa.kyla.fi>

I have written an extension (a.k.a. plugin or add-on, not C-extension)
system for my application and I'm going to ship two extensions with it.
Each extension is in a directory of its own and that directory contains
Python files and various data files, e.g. Glade XML files and PNG icons.

Where should I install these extension directories on a Unix system?
$PREFIX/share/foo or $PREFIX/lib/foo? How do I handle compiling with
distutils if installing Python code outside the default site-packages
directory?

Importing these extensions is handled by listing the contents of the
extension directory and using __import__ on the specified files, so the
installation directory does not need to be anywhere near $PYTHONPATH.

-- 
Osmo Salomaa <otsaloma at cc.hut.fi>



From thudfoo at opensuse.us  Fri Feb  6 14:48:18 2009
From: thudfoo at opensuse.us (member thudfoo)
Date: Fri, 6 Feb 2009 11:48:18 -0800
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <498C64E2.1050204@islandtraining.com>
References: <6v1u4pFho98dU1@mid.individual.net>
	<498C64E2.1050204@islandtraining.com>
Message-ID: <3d881a310902061148k251466eay57562acb1d51c812@mail.gmail.com>

On Fri, Feb 6, 2009 at 8:27 AM, Gary Herron <gherron at islandtraining.com> wrote:
> greg wrote:
>> SuPy 1.0
>> --------
>>
>> SuPy is a plugin for the Sketchup 3D modelling application
>> that lets you script it in Python.
>>
>>   http://www.cosc.canterbury.ac.nz/SuPy/
>
>
> That URL fails with a 404 - not found.  (At least for me at this moment
> in time.)
>
>
>>
>> This is a first version and is highly experimental. Let me
>> know if it works for you and whether you have any problems.
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

This URL works:

http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/


From manu3d at gmail.com  Fri Feb  6 14:53:44 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 6 Feb 2009 11:53:44 -0800 (PST)
Subject: thread-local data
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
	<6v3cs2Fhovi8U1@mid.uni-berlin.de> <6v3ctiFhovi8U2@mid.uni-berlin.de>
Message-ID: <707009a2-33d7-48f9-bf0d-0c7e13e19f94@a12g2000pro.googlegroups.com>

Thank you both MRAB and Diez.

I think I'll stick to making copies inside a thread-protected section
unless I need to speed up things, at which point I might go for the
key exception path.

Thank you again!

Manu






From deets at nospam.web.de  Fri Feb  6 14:55:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 20:55:43 +0100
Subject: Parallel port interfacing in python on Vista x64
In-Reply-To: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
References: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
Message-ID: <6v3iu0Fi5knrU1@mid.uni-berlin.de>

SiWi schrieb:
> I have done some googling on this topic, but I haven't found anything
> thats really working on Vista x64.
> The most promising result I found was the Inpout32.dll:
> http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html
> But when using some code like that, I can't measure I differing state
> on my breadboard circurity:
> from ctypes import windll
> p = windll.inpout32
> p.Inp32(0x378) #default 255(all high) on my pc
> p.Out32(0x378, 0) #put all low on port 2-9
> 
> Is it even possible to interface the Parallel Port on Vista64, and if
> so, how does one do that?

Did you try pyparallel?


Diez


From curt.hash at gmail.com  Fri Feb  6 15:03:23 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 13:03:23 -0700
Subject: Fastest database solution
In-Reply-To: <gmguue$uj4$1@ger.gmane.org>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
	<gmguue$uj4$1@ger.gmane.org>
Message-ID: <736698790902061203p7fa5f22cw982e70876b4745c6@mail.gmail.com>

On Fri, Feb 6, 2009 at 2:12 AM, Roger Binns <rogerb at rogerbinns.com> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Curt Hash wrote:
> > I started out using sqlite3, but was not satisfied with the performance
> > results. I then tried using psycopg2 with a local postgresql server, and
> > the performance got even worse.
>
> SQLite is in the same process.  Communication with postgres is via
> another process so marshalling the traffic and context switches will
> impose overhead as you found.
>
> > I don't think
> > my code/queries are inherently slow, but I'm not a DBA or a very
> > accomplished Python developer, so I could be wrong.
>
> It doesn't sound like a database is the best solution to your issue
> anyway.  A better solution would likely be some form of hashing the
> lines and storing something that gives quick hash lookups.  The hash
> would have to do things like not care what variable names are used etc.
>
> There are already lots of plagiarism detectors out there so it may be
> more prudent using one of them, or at least learn how they do things so
> your own system could improve on them.

Currently, I am stripping extra whitespace and end-of-line characters
from each line of source code and storing that in addition to its hash
in a table. That table is used for exact-match comparisons. I am also
passing the source code through flex/bison to canonicalize identifiers
-- the resulting lines are also hashed and stored in a table. That
table is used for structural matching. Both tables are queried to find
matching hashes. I'm not sure how I could make the hash lookups
faster...

On my small test dataset, this solution has detected all of the
plagiarism with high confidence.

It's also beneficial to me to use this Python application as I can
easily integrate it with other Python scripts I use to prepare code
for review.

>
> Roger
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
>
> iEYEARECAAYFAkmL/wgACgkQmOOfHg372QTAmACg0INMfUKA10Uc6UJwNhYhDeoV
> EKwAoKpDMRzr7GzCKeYxn93TU69nDx4X
> =4r01
> -----END PGP SIGNATURE-----
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From wimmersimon at googlemail.com  Fri Feb  6 15:03:50 2009
From: wimmersimon at googlemail.com (SiWi)
Date: Fri, 6 Feb 2009 12:03:50 -0800 (PST)
Subject: Parallel port interfacing in python on Vista x64
References: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
	<6v3iu0Fi5knrU1@mid.uni-berlin.de>
Message-ID: <2aa2e6d0-b217-4f76-912c-240511505c12@g1g2000pra.googlegroups.com>

On Feb 6, 8:55?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> SiWi schrieb:
>
> > I have done some googling on this topic, but I haven't found anything
> > thats really working on Vista x64.
> > The most promising result I found was the Inpout32.dll:
> >http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_...
> > But when using some code like that, I can't measure I differing state
> > on my breadboard circurity:
> > from ctypes import windll
> > p = windll.inpout32
> > p.Inp32(0x378) #default 255(all high) on my pc
> > p.Out32(0x378, 0) #put all low on port 2-9
>
> > Is it even possible to interface the Parallel Port on Vista64, and if
> > so, how does one do that?
>
> Did you try pyparallel?
>
> Diez

Yep, but when trying to make a instance of the Parallel class I get an
windows error.


From google at mrabarnett.plus.com  Fri Feb  6 15:09:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 20:09:03 +0000
Subject: Using cPickle
In-Reply-To: <4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
Message-ID: <498C98DF.5080507@mrabarnett.plus.com>

mmcclaf wrote:
> On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
>> mmcclaf wrote:
>>> Hi there,
>>> I have to make a small database using cPickle. I'm having troubles
>>> trying to read in the information if it's more than one line. I'm
>>> pretty sure it's in the line "for line in stuff:" Can anyone help me
>>> out? Basically the end result is wanting it to look something like
>>> what is down below when list is typed in:
>>> Last name                 First Name                Email Address
>>> Doe                          John
>>> j... at doe.com
>>> [code]
>>> # @author: Ocdt Murray McClafferty 24656
>>> # This will manage a small database using the cPickle module.
>>> # It must maintain a list of last names, first names and email
>>> addresses, and must let a user interact with the program
>>> #
>>> #!usr/bin/python
>>> # -*- coding: utf-8 -*-
>>> import sys
>>> import cPickle
>>> #
>>> format = '%s             %s                  %s'
>>> try:
>>>    filename = sys.argv[1]
>>>    input = open(filename, 'r')
>>> except IOError:
>>>    print 'File is not available, will create a new file now'
>>>    lastName='Last Name'
>>>    firstName='First Name'
>>>    email= 'Email'
>>>    #input.close()
>>>    output=open (filename, 'w')
>>>    total = format%(lastName, firstName, email)
>>>    cPickle.dump(total,output)
>>>    #cPickle.dump(firstName,output)
>>>    #cPickle.dump(email,output)
>>>    output.close()
>>> except EOFError:
>>>    print 'File is empty'
>>> #datas = cPickle.load(input)
>>> while True:
>>>    command=sys.stdin.readline()[:-1]
>>>    if command=='list': #lists the data in the file
>>>            input = open(filename, 'r')
>>>            stuff=cPickle.load(input)
>>>            for line in stuff:
>>>                    #firstName=cPickle.load(input)
>>>                    #email=cPickle.load(input)
>>>                    #print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
>>> (email).rjust(20)
>>>                    stuff=cPickle.load(input)
>>>                    print stuff
>>>                    print line
>>>            input.close()
>>>    if command=='exit' or command=='quit' : #NEVER forget the exit!!!
>>>            print 'Save changes? y for Yes, n for No'
>>>            commandSave=sys.stdin.readline()[:-1]
>>>            if commandSave =='y': #if the user wants to save
>>>                    output=open(filename, 'w')
>>>                    cPickle.dump(work,output)
>>>                    output.close()
>>>                    sys.exit(0)
>>>            if commandSave =='n': #no save
>>>                    input.close()
>>>                    sys.exit(0)
>>>    if command=='add': #adds an entity to the file
>>>            print 'Last name?'
>>>            lastName=sys.stdin.readline()[:-1]
>>>            print 'First name?'
>>>            firstName=sys.stdin.readline()[:-1]
>>>            print 'Email address?'
>>>            email=sys.stdin.readline()[:-1]
>>>            work = format%(lastName, firstName, email)
>>>            #output=open(filename, 'w')
>>>            #data=cPickle.load(output)
>>>            #data.append(work)
>>>            #output.close()
>>>            output=open(filename, 'a')
>>>            cPickle.dump(work,output)
>>>            output.close()
>>> [/code]
>>> All help would be appreciated. I am new to Python and this seems to be
>>> quite a challenge for me.
>> Make sure you use modes "rb" and "wb" when you open the pickle files. If
>> you are running on Windows this can make a difference.
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> I've tried both rb and wb as well as r and w, there appears to be no
> difference in the running of the code.
> 
"cPickle.dump(work,output)" writes a string and 
"stuff=cPickle.load(input)" just reads that string, so "for line in 
stuff:" is iterating through the characters if the string. You need to 
use cPickle.load() to read each string (line).


From curt.hash at gmail.com  Fri Feb  6 15:09:41 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 13:09:41 -0700
Subject: Fastest database solution
In-Reply-To: <498C2AEB.1010907@egenix.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
	<498C2AEB.1010907@egenix.com>
Message-ID: <736698790902061209r207d7e03lc6fe1afd92bfef2a@mail.gmail.com>

On Fri, Feb 6, 2009 at 5:19 AM, M.-A. Lemburg <mal at egenix.com> wrote:
> On 2009-02-06 09:10, Curt Hash wrote:
>> I'm writing a small application for detecting source code plagiarism that
>> currently relies on a database to store lines of code.
>>
>> The application has two primary functions: adding a new file to the database
>> and comparing a file to those that are already stored in the database.
>>
>> I started out using sqlite3, but was not satisfied with the performance
>> results. I then tried using psycopg2 with a local postgresql server, and the
>> performance got even worse. My simple benchmarks show that sqlite3 is an
>> average of 3.5 times faster at inserting a file, and on average less than a
>> tenth of a second slower than psycopg2 at matching a file.
>>
>> I expected postgresql to be a lot faster ... is there some peculiarity in
>> psycopg2 that could be causing slowdown? Are these performance results
>> typical? Any suggestions on what to try from here? I don't think my
>> code/queries are inherently slow, but I'm not a DBA or a very accomplished
>> Python developer, so I could be wrong.
>>
>> Any advice is appreciated.
>
> In general, if you do bulk insert into a large table, you should consider
> turning off indexing on the table and recreate/update the indexes in one
> go afterwards.
>
> But regardless of this detail, I think you should consider a filesystem
> based approach. This is going to be a lot faster than using a
> database to store the source code line by line. You can still use
> a database for the administration and indexing of the data, e.g.
> by storing a hash of each line in the database.
>

I can see how reconstructing source code from individual lines in the
database would be much slower than a filesystem-based approach.
However, what is of particular importance is that the matching itself
be fast. While the original lines of code are stored in the database,
I am performing matching based on only hashes. Would storing the
original code in the same table as the hash cause significant slowdown
if I am querying by hash only?

I think I may try this approach anyways, just to make retrieving the
original source code after finding a match faster, but I am still
primarily concerned with the speed of the hash lookups.

> --
> Marc-Andre Lemburg
> eGenix.com
>
> Professional Python Services directly from the Source  (#1, Feb 06 2009)
>>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
> ________________________________________________________________________
>
> ::: Try our new mxODBC.Connect Python Database Interface for free ! ::::
>
>
>   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
>    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
>           Registered at Amtsgericht Duesseldorf: HRB 46611
>               http://www.egenix.com/company/contact/
>


From bthayre at physics.ucsd.edu  Fri Feb  6 15:31:08 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 12:31:08 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
Message-ID: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>

Hello again,
I've found myself stumped when trying to organize this list of
objects.  The objects in question are timesheets which i'd like to
sort by four attributes:

class TimeSheet:
  department = string
  engagement = string
  date = datetime.date
  stare_hour = datetime.time

My ultimate goal is to have a list of this timesheet objects which are
first sorted by departments, then within each department block of the
list, have it organized by projects.  Within each project block i
finally want them sorted chronologically by date and time.

To sort the strings i tried:

timesheets.sort(key=operator.attrgetter('string'))

which is not doing anything to my list unfortunately; it leaves it
untouched.

Giving up on that  i tried to sort the dates or times using:

def sorter_time(a,b):
  if a.engagement == engagement:   # I only want sorting done within
each engagement block
    return cmp(a.start, b.start)
  return 0

timesheets.sort(sorter_time)

But this also did nothing to my list, and at this point i'm incredibly
confused.  From what i know of the involved functions, i would think
that these lines of code (while they wouldn't do exactly what i want
yet) would at least do something to my lists.

Any explanations, or suggestions for a different approach would be
greatly appreciated.  My brain might explode if i continue.



From miki.tebeka at gmail.com  Fri Feb  6 15:56:25 2009
From: miki.tebeka at gmail.com (Miki)
Date: Fri, 6 Feb 2009 12:56:25 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <0898369a-495e-44f3-8771-c26daf48db39@40g2000prx.googlegroups.com>


> I've found myself stumped when trying to organize this list of
> objects. ?The objects in question are timesheets which i'd like to
> sort by four attributes:
>
> class TimeSheet:
> ? department = string
> ? engagement = string
> ? date = datetime.date
> ? stare_hour = datetime.time
>
> My ultimate goal is to have a list of this timesheet objects which are
> first sorted by departments, then within each department block of the
> list, have it organized by projects. ?Within each project block i
> finally want them sorted chronologically by date and time.

Python "natural" sort for tuples is doing the right thing for you, for
example:
from operator import attrgetter
from random import randint
class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return "(%s, %s)" % (self.x, self.y)


points = [Point(randint(1, 10), randint(1, 10)) for i in range(10)]
print points
points.sort(key=attrgetter("x", "y"))
print points

Gave me:
[(2, 3), (1, 4), (4, 4), (6, 6), (2, 10), (3, 5), (7, 1), (3, 6), (4,
1), (9, 6)]
[(1, 4), (2, 3), (2, 10), (3, 5), (3, 6), (4, 1), (4, 4), (6, 6), (7,
1), (9, 6)]

Points first sorted by 'x' and then by 'y'.

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From rdmurray at bitdance.com  Fri Feb  6 15:58:10 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Fri, 6 Feb 2009 20:58:10 +0000 (UTC)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <gmi892$dge$1@ger.gmane.org>

Quoth Robocop <bthayre at physics.ucsd.edu>:
> Hello again,
> I've found myself stumped when trying to organize this list of
> objects.  The objects in question are timesheets which i'd like to
> sort by four attributes:
> 
> class TimeSheet:
>   department = string
>   engagement = string
>   date = datetime.date
>   stare_hour = datetime.time
> 
> My ultimate goal is to have a list of this timesheet objects which are
> first sorted by departments, then within each department block of the
> list, have it organized by projects.  Within each project block i
> finally want them sorted chronologically by date and time.
> 
> To sort the strings i tried:
> 
> timesheets.sort(key=operator.attrgetter('string'))
> 
> which is not doing anything to my list unfortunately; it leaves it
> untouched.

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> class Timesheet(object):
    ...     def __init__(self, department): self.department=department
    ...     def __repr__(self): return "Timesheet(%s)" % self.department
    ... 
    >>> timesheets = [Timesheet('abc'), Timesheet('def'), Timesheet('acd')]
    >>> timesheets
    [Timesheet(abc), Timesheet(def), Timesheet(acd)]
    >>> import operator
    >>> timesheets.sort(key=operator.attrgetter('department'))
    >>> timesheets
    [Timesheet(abc), Timesheet(acd), Timesheet(def)]

The key bit here being the argument to attrgetter, which is the name
of the attribute to use as they key.

--RDM



From andrew.replogle at gmail.com  Fri Feb  6 15:58:40 2009
From: andrew.replogle at gmail.com (Andrew)
Date: Fri, 6 Feb 2009 12:58:40 -0800 (PST)
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
	<mailman.8946.1233890231.3487.python-list@python.org>
Message-ID: <8ac1c027-3bd4-43ae-99a9-012462cb06d7@r37g2000prr.googlegroups.com>

On Feb 5, 9:17?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Thu, 05 Feb 2009 17:34:29 -0200, Andrew <andrew.replo... at gmail.com> ?
> escribi?:
>
>
>
> > On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
> >> escribi?:
>
> >> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> >> Andrew schrieb:
>
> >> >> > I'm running into a strange situation with getting incorrect
> >> >> > returncodes / exit status from python subprocess.call. I'm using a
> >> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
> >> >> > java applications to glassfish application server. Below is an >> ?
> >> > example
> > I've tried this several ways now. It seems to be something specific
> > with python and asadmin.bat.
>
> > I've tried the following manually in the cmd.exe prompt:
>
> [examples showing %ERRORLEVEL% correctly set when running from the command ?
> line, but subprocess.call doesn't get it]
>
> > Notice how python never gets the correct returncode from asadmin.bat
> > but I can get the correct returncode from the shell every time. Can
> > anyone tell me why Python wouldn't be able to get the correct
> > returncode for asadmin?
>
> The last exit code set by a command *should* propagate as the exit code of ?
> the whole .bat, then as the exit code of the cmd.exe instance that runs ?
> it, and finally Python *should* receive that value. Some old Windows ?
> versions didn't behave like that, but AFAIK XP does the right thing here.
> Unless asadmin.bat is playing tricks with %ERRORLEVEL% or something.
> Can you post the contents of asadmin.bat?
>
> Without looking into it, I can think of a few alternatives:
>
> - rewrite asadmin.bat in Python, if feasible. Some scripts just check/set ?
> a few environment variables and execute some process at the end, and ?
> that's all; in this case it should be easy to emulate the same thing in ?
> Python.
>
> - try using another layer of your own, e.g., my_asadmin.bat:
>
> call asadmin.bat %*
> exit /b %ERRORLEVEL%
>
> - variation: write the exit code somewhere:
>
> call asadmin.bat %*
> echo %ERRORLEVEL% > asadmin.err
>
> and read asadmin.err from Python. (I've used something like this in a ?
> chain Win32 process --> 16 bits GUI application --> .bat script --> old ?
> DOS executable)
>
> --
> Gabriel Genellina

Thanks Gabriel,

Someone on the glassfish forums also pointed out the "exit /B
%ERRORLEVEL%" for the bottom of the batch file and that corrected the
issue for me. As well as not using that and removing "endlocal" which
I admit I have no clue what that does. Removing endlocal seems to
cause the batch script to pass out the correct returncode.

Thanks everyone for your input and assistance =]

Andrew


From bearophileHUGS at lycos.com  Fri Feb  6 16:03:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 13:03:32 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>

Robocop:

>then within each department block of the list, have it organized by projects.<

I don't know what does it means.

> timesheets.sort(key=operator.attrgetter('string'))

Try something like:
timesheets.sort(key=attrgetter("department", "engagement", "date",
"stare_hour"))


> My brain might explode if i continue.

Relax.

Bye,
bearophile


From cs at zip.com.au  Fri Feb  6 16:08:57 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 7 Feb 2009 08:08:57 +1100
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <20090206210857.GA6933@cskk.homeip.net>

On 05Feb2009 01:47, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
| [...] But even if the average performance becomes a
| little worse I think making the default Python dict as ordered is a
| positive change for Python too, because built-ins are meant to be as
| flexible as possible, even if they aren't the fastest ones or the less
| memory hungry ones

I like the builtins to be as fast as possible. If I'm not "abusing" a
built in facility I like to have the peace of mind that there's no
point being concerned about the performance of the built-in - it will be
optimal or close to it. So I feel no temptation to reimplement the wheel
and can devote my energies to the code using the wheel.

So if a dictionary has a performance weakness to add a non-widely-needed
behaviour, it's not longer a "pure" mapping and I will feel unhappy using
it.
 
| (and keeping dicts ordered decreases the surprises
| a newbie finds, makes some code cleaner, and doctests become simpler
| to write because the order of items may be more defined).

I read this as:
  - increases the unrealised assumptions about mappings in general which a
    newbie may acquire, causing them pain/complaint later with other
    mappings
  - makes some code shorter
  - making tests slightly simpler to write; it's not very hard to
    track insert order for purposes of a test short that be needed, is
    it? it seems a small gain for a loss in every production scenario

| Once the default dicts are ordered, it can be possible to add an
| unordereddict to the collections module to be used by programmers when
| max performance or low memory usage is very important :-)

I would much rather keep dictionaries as performant as possible, as a
bare mapping, and add an odict for when order matters.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

The wireless music box has no imaginable commercial value.   Who would pay
for a message sent to nobody in particular?
      --David Sarnoff's associates in response to his urgings for
        investment in  the radio in the 1920s.


From dq at gmail.com  Fri Feb  6 16:09:22 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 22:09:22 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <498beb5a$0$3305$9b622d9e@news.freenet.de>
References: <gmgp38$m2s$00$1@news.t-online.com>
	<498beb5a$0$3305$9b622d9e@news.freenet.de>
Message-ID: <gmi8u3$bms$01$1@news.t-online.com>

Martin v. L?wis wrote:
>> So does anyone know what the deal is with this?  Why is the same code so
>> much slower on Windows?  Hope someone can tell me before a holy war
>> erupts :-)
> 
> Only the holy war can give an answer here. It certainly has *nothing* to
> do with Python; Python calls the operating system functions to read from
> the network and write to the disk almost directly. So it must be the
> operating system itself that slows it down.
> 
> To investigate further, you might drop the write operating, and measure
> only source.read(). If that is slower, then, for some reason, the
> network speed is bad on Windows. Maybe you have the network interfaces
> misconfigured? Maybe you are using wireless on Windows, but cable on
> Linux? Maybe you have some network filtering software running on
> Windows? Maybe it's just that Windows sucks?-)
> 
> If the network read speed is fine, but writing slows down, I ask the
> same questions. Perhaps you have some virus scanner installed that
> filters all write operations? Maybe Windows sucks?
> 
> Regards,
> Martin
> 

Thanks for the ideas, Martin.  I ran a couple of experiments to find the 
culprit, by downloading the same 20 MB file from the same fast server. 
I compared:

1.  DL to HD vs USB iPod.
2.  AV on-access protection on vs. off
3.  "source. read()" only vs.  "file.write( source.read() )"

The culprit is definitely the write speed on the iPod.  That is, 
everything runs plenty fast (~1 MB/s down) as long as I'm not writing 
directly to the iPod.  This is kind of odd, because if I copy the file 
over from the HD to the iPod using windows (drag-n-drop), it takes about 
a second or two, so about 10 MB/s.

So the problem is definitely partially Windows, but it also seems that 
Python's file.write() function is not without blame.  It's the 
combination of Windows, iPod and Python's data stream that is slowing me 
down.

I'm not really sure what I can do about this.  I'll experiment a little 
more and see if there's any way around this bottleneck.  If anyone has 
run into a problem like this, I'd love to hear about it...

thanks again,
--danny


From sjmachin at lexicon.net  Fri Feb  6 16:14:43 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 13:14:43 -0800 (PST)
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com> 
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
	<mailman.8995.1233944607.3487.python-list@python.org>
Message-ID: <786fac80-ebac-4264-ab45-6bf20c77b4c6@f40g2000pri.googlegroups.com>

On Feb 7, 5:23?am, Terry Reedy <tjre... at udel.edu> wrote:
> John Machin wrote:
> > The UTF-n siblings are *external* representations.
> > 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
> > 3.x: an_str_object.decode('UTF-16') -> a_bytes_object
>
> That should be .encode() to bytes, which is the coded form.
> .decode is bytes => str/unicode

True. I guess that makes me the Dohmouse :-)


From rhamph at gmail.com  Fri Feb  6 16:23:48 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Fri, 6 Feb 2009 13:23:48 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
Message-ID: <9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>

On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > >Looks fine to me. In some situations you may also use hasattr(el,
> > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > >flatten generic iterables or only lists).
>
> > Of course, once you do that, you need to special-case strings...
>
> Strings are iterable but have no __iter__ method, which is fine in
> this context, since I would say 99.9% of times one wants to treat them
> as atomic objects, so no need to special case.

Don't worry, that little oddity was fixed for you:

Python 3.0+ (unknown, Dec  8 2008, 14:26:15)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> str.__iter__
<slot wrapper '__iter__' of 'str' objects>
>>> bytes.__iter__
<slot wrapper '__iter__' of 'bytes' objects>
>>> bytearray.__iter__
<slot wrapper '__iter__' of 'bytearray' objects>


I'm in the "why do you need more than 1 depth?" camp.  Dispatching
based on your own type should be given an extra look.  Dispatching
based passed in types should be given three extra looks.

I didn't realize itertools.chain(*iterable) worked.  I guess that
needs to be pushed as the canonical form.


From mmcclaf at gmail.com  Fri Feb  6 16:29:53 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 13:29:53 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
	<mailman.9003.1233950946.3487.python-list@python.org>
Message-ID: <60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>

On Feb 6, 3:09?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> mmcclaf wrote:
> > On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
> >> mmcclaf wrote:
> >>> Hi there,
> >>> I have to make a small database using cPickle. I'm having troubles
> >>> trying to read in the information if it's more than one line. I'm
> >>> pretty sure it's in the line "for line in stuff:" Can anyone help me
> >>> out? Basically the end result is wanting it to look something like
> >>> what is down below when list is typed in:
> >>> Last name ? ? ? ? ? ? ? ? First Name ? ? ? ? ? ? ? ?Email Address
> >>> Doe ? ? ? ? ? ? ? ? ? ? ? ? ?John
> >>> j... at doe.com
> >>> [code]
> >>> # @author: Ocdt Murray McClafferty 24656
> >>> # This will manage a small database using the cPickle module.
> >>> # It must maintain a list of last names, first names and email
> >>> addresses, and must let a user interact with the program
> >>> #
> >>> #!usr/bin/python
> >>> # -*- coding: utf-8 -*-
> >>> import sys
> >>> import cPickle
> >>> #
> >>> format = '%s ? ? ? ? ? ? %s ? ? ? ? ? ? ? ? ?%s'
> >>> try:
> >>> ? ?filename = sys.argv[1]
> >>> ? ?input = open(filename, 'r')
> >>> except IOError:
> >>> ? ?print 'File is not available, will create a new file now'
> >>> ? ?lastName='Last Name'
> >>> ? ?firstName='First Name'
> >>> ? ?email= 'Email'
> >>> ? ?#input.close()
> >>> ? ?output=open (filename, 'w')
> >>> ? ?total = format%(lastName, firstName, email)
> >>> ? ?cPickle.dump(total,output)
> >>> ? ?#cPickle.dump(firstName,output)
> >>> ? ?#cPickle.dump(email,output)
> >>> ? ?output.close()
> >>> except EOFError:
> >>> ? ?print 'File is empty'
> >>> #datas = cPickle.load(input)
> >>> while True:
> >>> ? ?command=sys.stdin.readline()[:-1]
> >>> ? ?if command=='list': #lists the data in the file
> >>> ? ? ? ? ? ?input = open(filename, 'r')
> >>> ? ? ? ? ? ?stuff=cPickle.load(input)
> >>> ? ? ? ? ? ?for line in stuff:
> >>> ? ? ? ? ? ? ? ? ? ?#firstName=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?#email=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> >>> (email).rjust(20)
> >>> ? ? ? ? ? ? ? ? ? ?stuff=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?print stuff
> >>> ? ? ? ? ? ? ? ? ? ?print line
> >>> ? ? ? ? ? ?input.close()
> >>> ? ?if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> >>> ? ? ? ? ? ?print 'Save changes? y for Yes, n for No'
> >>> ? ? ? ? ? ?commandSave=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?if commandSave =='y': #if the user wants to save
> >>> ? ? ? ? ? ? ? ? ? ?output=open(filename, 'w')
> >>> ? ? ? ? ? ? ? ? ? ?cPickle.dump(work,output)
> >>> ? ? ? ? ? ? ? ? ? ?output.close()
> >>> ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> >>> ? ? ? ? ? ?if commandSave =='n': #no save
> >>> ? ? ? ? ? ? ? ? ? ?input.close()
> >>> ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> >>> ? ?if command=='add': #adds an entity to the file
> >>> ? ? ? ? ? ?print 'Last name?'
> >>> ? ? ? ? ? ?lastName=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?print 'First name?'
> >>> ? ? ? ? ? ?firstName=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?print 'Email address?'
> >>> ? ? ? ? ? ?email=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?work = format%(lastName, firstName, email)
> >>> ? ? ? ? ? ?#output=open(filename, 'w')
> >>> ? ? ? ? ? ?#data=cPickle.load(output)
> >>> ? ? ? ? ? ?#data.append(work)
> >>> ? ? ? ? ? ?#output.close()
> >>> ? ? ? ? ? ?output=open(filename, 'a')
> >>> ? ? ? ? ? ?cPickle.dump(work,output)
> >>> ? ? ? ? ? ?output.close()
> >>> [/code]
> >>> All help would be appreciated. I am new to Python and this seems to be
> >>> quite a challenge for me.
> >> Make sure you use modes "rb" and "wb" when you open the pickle files. If
> >> you are running on Windows this can make a difference.
>
> >> regards
> >> ?Steve
> >> --
> >> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> >> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/
>
> > I've tried both rb and wb as well as r and w, there appears to be no
> > difference in the running of the code.
>
> "cPickle.dump(work,output)" writes a string and
> "stuff=cPickle.load(input)" just reads that string, so "for line in
> stuff:" is iterating through the characters if the string. You need to
> use cPickle.load() to read each string (line).

Ok, so I just modified that section to:
[code]
	if command=='list': #lists the data in the file
		input = open(filename, 'r')
		stuff=cPickle.load(input)
		for line in stuff:
			#firstName=cPickle.load(input)
			#email=cPickle.load(input)
			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
(email).rjust(20)
			stuff=cPickle.load(input)
			print stuff


		input.close()
[/code]

And now it's printing it out ok, but then I get an EOFError at
stuff=cPickle.load(onput) at line 45.


From google at mrabarnett.plus.com  Fri Feb  6 16:47:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 21:47:41 +0000
Subject: Ordered dict by default
In-Reply-To: <20090206210857.GA6933@cskk.homeip.net>
References: <20090206210857.GA6933@cskk.homeip.net>
Message-ID: <498CAFFD.9010703@mrabarnett.plus.com>

Cameron Simpson wrote:
> On 05Feb2009 01:47, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
> | [...] But even if the average performance becomes a
> | little worse I think making the default Python dict as ordered is a
> | positive change for Python too, because built-ins are meant to be as
> | flexible as possible, even if they aren't the fastest ones or the less
> | memory hungry ones
[snip]
> I would much rather keep dictionaries as performant as possible, as a
> bare mapping, and add an odict for when order matters.
> 
+1



From skippy.hammond at gmail.com  Fri Feb  6 16:54:16 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 07 Feb 2009 08:54:16 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BC8E4.7000108@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>	<498BB39D.5070809@gmail.com>
	<498BBBE0.6090704@gmail.com> <498BC8E4.7000108@gmail.com>
Message-ID: <498CB188.40104@gmail.com>

On 6/02/2009 4:21 PM, Volodymyr Orlenko wrote:
> In the patch I submitted, I simply check if the name of the supposed
> module ends with ".exe". It works fine for my case, but maybe this is
> too general. Is there a chance that a Python module would end in ".exe"?

IIRC, py2exe may create executables where sys.argv[0] is the executable 
itself.  Maybe if we consider and handle both these cases a patch to mp 
might be looked upon in a better light...

Cheers,

Mark


From google at mrabarnett.plus.com  Fri Feb  6 16:54:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 21:54:40 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmi8u3$bms$01$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>
	<gmi8u3$bms$01$1@news.t-online.com>
Message-ID: <498CB1A0.7090003@mrabarnett.plus.com>

dq wrote:
 > Martin v. L?wis wrote:
 >>> So does anyone know what the deal is with this?  Why is the same 
code so
 >>> much slower on Windows?  Hope someone can tell me before a holy war
 >>> erupts :-)
 >>
 >> Only the holy war can give an answer here. It certainly has *nothing* to
 >> do with Python; Python calls the operating system functions to read from
 >> the network and write to the disk almost directly. So it must be the
 >> operating system itself that slows it down.
 >>
 >> To investigate further, you might drop the write operating, and measure
 >> only source.read(). If that is slower, then, for some reason, the
 >> network speed is bad on Windows. Maybe you have the network interfaces
 >> misconfigured? Maybe you are using wireless on Windows, but cable on
 >> Linux? Maybe you have some network filtering software running on
 >> Windows? Maybe it's just that Windows sucks?-)
 >>
 >> If the network read speed is fine, but writing slows down, I ask the
 >> same questions. Perhaps you have some virus scanner installed that
 >> filters all write operations? Maybe Windows sucks?
 >>
 >> Regards,
 >> Martin
 >>
 >
 > Thanks for the ideas, Martin.  I ran a couple of experiments to find the
 > culprit, by downloading the same 20 MB file from the same fast server. I
 > compared:
 >
 > 1.  DL to HD vs USB iPod.
 > 2.  AV on-access protection on vs. off
 > 3.  "source. read()" only vs.  "file.write( source.read() )"
 >
 > The culprit is definitely the write speed on the iPod.  That is,
 > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
 > directly to the iPod.  This is kind of odd, because if I copy the file
 > over from the HD to the iPod using windows (drag-n-drop), it takes about
 > a second or two, so about 10 MB/s.
 >
 > So the problem is definitely partially Windows, but it also seems that
 > Python's file.write() function is not without blame.  It's the
 > combination of Windows, iPod and Python's data stream that is slowing me
 > down.
 >
 > I'm not really sure what I can do about this.  I'll experiment a little
 > more and see if there's any way around this bottleneck.  If anyone has
 > run into a problem like this, I'd love to hear about it...
 >
You could try copying the file to the iPod using the command line, or
copying data from disk to iPod in, say, C, anything but Python. This
would allow you to identify whether Python itself has anything to do
with it.


From skippy.hammond at gmail.com  Fri Feb  6 16:59:57 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 07 Feb 2009 08:59:57 +1100
Subject: WIn32api
In-Reply-To: <5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>
References: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
	<5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>
Message-ID: <498CB2DD.8010909@gmail.com>

On 7/02/2009 3:28 AM, K-Dawg wrote:

You might like to seek out the python-win32 mailing list for stuff like 
this where more people tend to pay attention to windows problems.

> This works if I call run() specifically. But when I try to initiate the
> thread with .start() I get the following error

Unfortunately threads and COM are tricky.  The short story is that you 
can't, in the general case, pass a COM object from one thread to 
another.  You need to google "COM threading models", and if you *really* 
want to pass objects between threads, the impressively named MSCOM 
function CoMarshalInterThreadInterfaceInStream (exposed via the 
pythoncom module).  The above mailing list has had a number of threads 
on this issue over the years...

Cheers,

Mark


From google at mrabarnett.plus.com  Fri Feb  6 17:04:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 22:04:09 +0000
Subject: Using cPickle
In-Reply-To: <60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>	<mailman.8986.1233933973.3487.python-list@python.org>	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>	<mailman.9003.1233950946.3487.python-list@python.org>
	<60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
Message-ID: <498CB3D9.6000203@mrabarnett.plus.com>

mmcclaf wrote:
> On Feb 6, 3:09 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> mmcclaf wrote:
>>> On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
>>>> mmcclaf wrote:
>>>>> Hi there,
>>>>> I have to make a small database using cPickle. I'm having troubles
>>>>> trying to read in the information if it's more than one line. I'm
>>>>> pretty sure it's in the line "for line in stuff:" Can anyone help me
>>>>> out? Basically the end result is wanting it to look something like
>>>>> what is down below when list is typed in:
>>>>> Last name                 First Name                Email Address
>>>>> Doe                          John
>>>>> j... at doe.com
>>>>> [code]
>>>>> # @author: Ocdt Murray McClafferty 24656
>>>>> # This will manage a small database using the cPickle module.
>>>>> # It must maintain a list of last names, first names and email
>>>>> addresses, and must let a user interact with the program
>>>>> #
>>>>> #!usr/bin/python
>>>>> # -*- coding: utf-8 -*-
>>>>> import sys
>>>>> import cPickle
>>>>> #
>>>>> format = '%s             %s                  %s'
>>>>> try:
>>>>>    filename = sys.argv[1]
>>>>>    input = open(filename, 'r')
>>>>> except IOError:
>>>>>    print 'File is not available, will create a new file now'
>>>>>    lastName='Last Name'
>>>>>    firstName='First Name'
>>>>>    email= 'Email'
>>>>>    #input.close()
>>>>>    output=open (filename, 'w')
>>>>>    total = format%(lastName, firstName, email)
>>>>>    cPickle.dump(total,output)
>>>>>    #cPickle.dump(firstName,output)
>>>>>    #cPickle.dump(email,output)
>>>>>    output.close()
>>>>> except EOFError:
>>>>>    print 'File is empty'
>>>>> #datas = cPickle.load(input)
>>>>> while True:
>>>>>    command=sys.stdin.readline()[:-1]
>>>>>    if command=='list': #lists the data in the file
>>>>>            input = open(filename, 'r')
>>>>>            stuff=cPickle.load(input)
>>>>>            for line in stuff:
>>>>>                    #firstName=cPickle.load(input)
>>>>>                    #email=cPickle.load(input)
>>>>>                    #print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
>>>>> (email).rjust(20)
>>>>>                    stuff=cPickle.load(input)
>>>>>                    print stuff
>>>>>                    print line
>>>>>            input.close()
>>>>>    if command=='exit' or command=='quit' : #NEVER forget the exit!!!
>>>>>            print 'Save changes? y for Yes, n for No'
>>>>>            commandSave=sys.stdin.readline()[:-1]
>>>>>            if commandSave =='y': #if the user wants to save
>>>>>                    output=open(filename, 'w')
>>>>>                    cPickle.dump(work,output)
>>>>>                    output.close()
>>>>>                    sys.exit(0)
>>>>>            if commandSave =='n': #no save
>>>>>                    input.close()
>>>>>                    sys.exit(0)
>>>>>    if command=='add': #adds an entity to the file
>>>>>            print 'Last name?'
>>>>>            lastName=sys.stdin.readline()[:-1]
>>>>>            print 'First name?'
>>>>>            firstName=sys.stdin.readline()[:-1]
>>>>>            print 'Email address?'
>>>>>            email=sys.stdin.readline()[:-1]
>>>>>            work = format%(lastName, firstName, email)
>>>>>            #output=open(filename, 'w')
>>>>>            #data=cPickle.load(output)
>>>>>            #data.append(work)
>>>>>            #output.close()
>>>>>            output=open(filename, 'a')
>>>>>            cPickle.dump(work,output)
>>>>>            output.close()
>>>>> [/code]
>>>>> All help would be appreciated. I am new to Python and this seems to be
>>>>> quite a challenge for me.
>>>> Make sure you use modes "rb" and "wb" when you open the pickle files. If
>>>> you are running on Windows this can make a difference.
>>>> regards
>>>>  Steve
>>>> --
>>>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>>>> Holden Web LLC              http://www.holdenweb.com/
>>> I've tried both rb and wb as well as r and w, there appears to be no
>>> difference in the running of the code.
>> "cPickle.dump(work,output)" writes a string and
>> "stuff=cPickle.load(input)" just reads that string, so "for line in
>> stuff:" is iterating through the characters if the string. You need to
>> use cPickle.load() to read each string (line).
> 
> Ok, so I just modified that section to:
> [code]
> 	if command=='list': #lists the data in the file
> 		input = open(filename, 'r')
> 		stuff=cPickle.load(input)
> 		for line in stuff:
You're still iterating over the string.

> 			#firstName=cPickle.load(input)
> 			#email=cPickle.load(input)
> 			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> (email).rjust(20)
> 			stuff=cPickle.load(input)
> 			print stuff
> 
> 
> 		input.close()
> [/code]
> 
> And now it's printing it out ok, but then I get an EOFError at
> stuff=cPickle.load(onput) at line 45.
> 
You can just keep reading until EOFError occurs, at which point you know
you've reached the end of the file:

input = open(filename, 'rb')
try:
     while True:
         stuff = cPickle.load(input)
         print stuff
except EOFError:
     pass
input.close()


From bthayre at physics.ucsd.edu  Fri Feb  6 17:08:30 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:08:30 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
Message-ID: <ee399ac9-cc32-4838-832a-9dd682dbbd71@v39g2000pro.googlegroups.com>

On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
> Robocop:
>
> >then within each department block of the list, have it organized by projects.<
>
> I don't know what does it means.
>
> > timesheets.sort(key=operator.attrgetter('string'))
>
> Try something like:
> timesheets.sort(key=attrgetter("department", "engagement", "date",
> "stare_hour"))
>
> > My brain might explode if i continue.
>
> Relax.
>
> Bye,
> bearophile

Projects was meant to be engagements.  All these suggestions are
great, let me see what i can make happen right now. Thanks all!


From bthayre at physics.ucsd.edu  Fri Feb  6 17:17:10 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:17:10 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
Message-ID: <d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>

On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
> Robocop:
>
> >then within each department block of the list, have it organized by projects.<
>
> I don't know what does it means.
>
> > timesheets.sort(key=operator.attrgetter('string'))
>
> Try something like:
> timesheets.sort(key=attrgetter("department", "engagement", "date",
> "stare_hour"))
>
> > My brain might explode if i continue.
>
> Relax.
>
> Bye,
> bearophile




UH OH GUYS!

line 110, in sorter
    timesheets.sort(key=attrgetter("department", "engagement",
"date","start"))
TypeError: attrgetter expected 1 arguments, got 4


From bthayre at physics.ucsd.edu  Fri Feb  6 17:20:09 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:20:09 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
Message-ID: <3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>

On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
>
>
> > Robocop:
>
> > >then within each department block of the list, have it organized by projects.<
>
> > I don't know what does it means.
>
> > > timesheets.sort(key=operator.attrgetter('string'))
>
> > Try something like:
> > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > "stare_hour"))
>
> > > My brain might explode if i continue.
>
> > Relax.
>
> > Bye,
> > bearophile
>
> UH OH GUYS!
>
> line 110, in sorter
> ? ? timesheets.sort(key=attrgetter("department", "engagement",
> "date","start"))
> TypeError: attrgetter expected 1 arguments, got 4

I think there may have been a misunderstanding.  I was already using
attrgetter, my problem is that it doesn't appear to be sorting by the
argument i give it.  How does sort work with strings?  How about with
datetime.time or datetime.date?

So far i can get it sorting strictly by the datetime objects, but i
need all of this sorting done within the constraints imposed by doing
sorts via department and engagements.

Any ideas?


From bthayre at physics.ucsd.edu  Fri Feb  6 17:34:35 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:34:35 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
Message-ID: <9c1c8e31-98fc-4fbf-827c-d785685b91e5@v5g2000pre.googlegroups.com>

On Feb 6, 2:20?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
>
>
> > On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
> > > Robocop:
>
> > > >then within each department block of the list, have it organized by projects.<
>
> > > I don't know what does it means.
>
> > > > timesheets.sort(key=operator.attrgetter('string'))
>
> > > Try something like:
> > > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > > "stare_hour"))
>
> > > > My brain might explode if i continue.
>
> > > Relax.
>
> > > Bye,
> > > bearophile
>
> > UH OH GUYS!
>
> > line 110, in sorter
> > ? ? timesheets.sort(key=attrgetter("department", "engagement",
> > "date","start"))
> > TypeError: attrgetter expected 1 arguments, got 4
>
> I think there may have been a misunderstanding. ?I was already using
> attrgetter, my problem is that it doesn't appear to be sorting by the
> argument i give it. ?How does sort work with strings? ?How about with
> datetime.time or datetime.date?
>
> So far i can get it sorting strictly by the datetime objects, but i
> need all of this sorting done within the constraints imposed by doing
> sorts via department and engagements.
>
> Any ideas?

I'm stuck with python 2.4 right now:(


From tjreedy at udel.edu  Fri Feb  6 17:34:51 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 17:34:51 -0500
Subject: Trouble sorting a list of objects by attributes
In-Reply-To: <d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
Message-ID: <gmiduc$vej$1@ger.gmane.org>

Robocop wrote:

> UH OH GUYS!
> 
> line 110, in sorter
>     timesheets.sort(key=attrgetter("department", "engagement",
> "date","start"))
> TypeError: attrgetter expected 1 arguments, got 4

Um... what version of Python are you running?  Alway specify. (Too many 
people do not).  In 3.0

from operator import attrgetter
f=attrgetter("department", "engagement","date","start")

runs fine as per the doc.

operator.attrgetter(attr[, args...])
Return a callable object that fetches attr from its operand. If more 
than one attribute is requested, returns a tuple of attributes. After, f 
= attrgetter('name'), the call f(b) returns b.name. After, f = 
attrgetter('name', 'date'), the call f(b) returns (b.name, b.date).



From dq at gmail.com  Fri Feb  6 17:35:58 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 23:35:58 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9008.1233957283.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>
	<mailman.9008.1233957283.3487.python-list@python.org>
Message-ID: <gmie0f$3e7$03$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>  > Martin v. L?wis wrote:
>  >>> So does anyone know what the deal is with this?  Why is the same 
> code so
>  >>> much slower on Windows?  Hope someone can tell me before a holy war
>  >>> erupts :-)
>  >>
>  >> Only the holy war can give an answer here. It certainly has 
> *nothing* to
>  >> do with Python; Python calls the operating system functions to read 
> from
>  >> the network and write to the disk almost directly. So it must be the
>  >> operating system itself that slows it down.
>  >>
>  >> To investigate further, you might drop the write operating, and measure
>  >> only source.read(). If that is slower, then, for some reason, the
>  >> network speed is bad on Windows. Maybe you have the network interfaces
>  >> misconfigured? Maybe you are using wireless on Windows, but cable on
>  >> Linux? Maybe you have some network filtering software running on
>  >> Windows? Maybe it's just that Windows sucks?-)
>  >>
>  >> If the network read speed is fine, but writing slows down, I ask the
>  >> same questions. Perhaps you have some virus scanner installed that
>  >> filters all write operations? Maybe Windows sucks?
>  >>
>  >> Regards,
>  >> Martin
>  >>
>  >
>  > Thanks for the ideas, Martin.  I ran a couple of experiments to find the
>  > culprit, by downloading the same 20 MB file from the same fast server. I
>  > compared:
>  >
>  > 1.  DL to HD vs USB iPod.
>  > 2.  AV on-access protection on vs. off
>  > 3.  "source. read()" only vs.  "file.write( source.read() )"
>  >
>  > The culprit is definitely the write speed on the iPod.  That is,
>  > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
>  > directly to the iPod.  This is kind of odd, because if I copy the file
>  > over from the HD to the iPod using windows (drag-n-drop), it takes about
>  > a second or two, so about 10 MB/s.
>  >
>  > So the problem is definitely partially Windows, but it also seems that
>  > Python's file.write() function is not without blame.  It's the
>  > combination of Windows, iPod and Python's data stream that is slowing me
>  > down.
>  >
>  > I'm not really sure what I can do about this.  I'll experiment a little
>  > more and see if there's any way around this bottleneck.  If anyone has
>  > run into a problem like this, I'd love to hear about it...
>  >
> You could try copying the file to the iPod using the command line, or
> copying data from disk to iPod in, say, C, anything but Python. This
> would allow you to identify whether Python itself has anything to do
> with it.

Well, I think I've partially identified the problem.  target.write( 
source.read() ) runs perfectly fast, copies 20 megs in about a second, 
from HD to iPod.  However, if I run the same code in a while loop, using 
a certain block size, say target.write( source.read(4096) ), it takes 
forever (or at least I'm still timing it while I write this post).

The mismatch seems to be between urllib2's block size and the write 
speed of the iPod, I might try to tweak this a little in the code and 
see if it has any effect.

Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to 
try to improve that...


From bthayre at physics.ucsd.edu  Fri Feb  6 17:38:37 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:38:37 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com> 
	<9c1c8e31-98fc-4fbf-827c-d785685b91e5@v5g2000pre.googlegroups.com>
Message-ID: <635e13a8-cdc8-4535-bdd8-4df2fe719215@n33g2000pri.googlegroups.com>

On Feb 6, 2:34?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 2:20?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
>
>
> > On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
> > > On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
> > > > Robocop:
>
> > > > >then within each department block of the list, have it organized by projects.<
>
> > > > I don't know what does it means.
>
> > > > > timesheets.sort(key=operator.attrgetter('string'))
>
> > > > Try something like:
> > > > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > > > "stare_hour"))
>
> > > > > My brain might explode if i continue.
>
> > > > Relax.
>
> > > > Bye,
> > > > bearophile
>
> > > UH OH GUYS!
>
> > > line 110, in sorter
> > > ? ? timesheets.sort(key=attrgetter("department", "engagement",
> > > "date","start"))
> > > TypeError: attrgetter expected 1 arguments, got 4
>
> > I think there may have been a misunderstanding. ?I was already using
> > attrgetter, my problem is that it doesn't appear to be sorting by the
> > argument i give it. ?How does sort work with strings? ?How about with
> > datetime.time or datetime.date?
>
> > So far i can get it sorting strictly by the datetime objects, but i
> > need all of this sorting done within the constraints imposed by doing
> > sorts via department and engagements.
>
> > Any ideas?
>
> I'm stuck with python 2.4 right now:(

I've got a python 2.4 fix though!

 timesheets.sort(key= lambda i:(i.department,i.engagement,i.start))



Thanks for the help and time!!!!!


From apt.shansen at gmail.com  Fri Feb  6 17:41:25 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 14:41:25 -0800
Subject: Trouble sorting a list of objects by attributes
In-Reply-To: <3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
Message-ID: <7a9c25c20902061441u56a646e2lc1767fc03360f55c@mail.gmail.com>

> I think there may have been a misunderstanding.  I was already using
> attrgetter, my problem is that it doesn't appear to be sorting by the
> argument i give it.  How does sort work with strings?  How about with
> datetime.time or datetime.date?

You were using the attrgetter, but it looks like you weren't doing it correctly:

    timesheets.sort(key=operator.attrgetter('string'))

You don't specify a type, be it string or date or anything: you
specify the /name/ of the attribute to get. It'll handle sorting by
any data type that has an order to it without you having to worry
about it at all. Strings, ints, dates, times.

It should be:

   timesheets.sort(key=operator.attrgetter("department"))

If you want to sort by the value of the "department" attribute, which
happens to be a string.
If you want to sort by the "date" attribute, which happens to be a
datetime.date, you do:
   timesheets.sort(key=operator.attrgetter("date"))

Where date is not a datatype a la datetime.date, but the name of an
attribute on your TimeSheet instances.

--S


From bearophileHUGS at lycos.com  Fri Feb  6 18:19:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 15:19:22 -0800 (PST)
Subject: Ordered dict by default
References: <mailman.9006.1233954552.3487.python-list@python.org>
Message-ID: <dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>

Cameron Simpson:

>increases the unrealised assumptions about mappings in general which a newbie may acquire, causing them pain/complaint later with other mappings<

This is wrong in several different ways.


> I would much rather keep dictionaries as performant as possible, as a
> bare mapping, and add an odict for when order matters.

In Python 3 strings are all unicode, integral numbers are all
multiprecision, chars in Python 2.x+ are strings, lists are arrays
that can grow dynamically, and so on because the Purpose of Python
isn't to be as fast as possible, but to be first of all flexible,
safe, easy, not but-prone, even if other solution or older versions
were faster. Ruby shares almost same purposes.

I presume Ruby wants to become a bit higher level than Python, because
it now has a more flexible built-in. But even in a language designed
to run way faster than Python, like D, I think the right thing for
built-ins is to be as flexible&easy as possible, so they are good
enough in as many situations as possible, where performance isn't the
most important thing, and to put the more specialized and faster
versions into external libs. Making the built-ins be as optimized as
possible (but limited too) looks like premature optimization to me,
and in a language like Python premature optimization looks even more
silly than usual.

Bye,
bearophile


From patrick.hartling at gmail.com  Fri Feb  6 18:19:52 2009
From: patrick.hartling at gmail.com (Patrick Hartling)
Date: Fri, 6 Feb 2009 17:19:52 -0600
Subject: Module unloading resulting from SystemExit exception
Message-ID: <944f7d8e0902061519x5dbc531au87003997a7a9bd10@mail.gmail.com>

I am trying to understand how the SystemExit exception influences
module unloading. The situation that I am facing is that a Python
application behaves just fine upon exiting when executed using the
standard Python interpreter, but when run as a frozen executable,
modules are unloaded unexpectedly as a result of sys.exit() being
called. This wouldn't be an issue at all except that callbacks
registered with the atexit module have to re-import all modules that
they want to use, and this can be rather unwieldy.

I have narrowed it down to the SystemExit exception by determining
that the problem does not occur if my __main__ module catches
SystemExit and allows the script to terminate by reaching the end of
__main__. If the exception is not caught or is re-raised, then the
problem occurs. Since SystemExit influences the shutdown of threads,
it seems that I need to let it be raised to keep the application from
deadlocking on exit.

I am working with Python 2.6.1, and I saw this behavior with 2.5 as
well. It happens on Windows, Mac OS X, and Linux. The code that I am
using for the frozen executable is generated by sib.py from VendorID
1.0.0. The fact that VendorID is being used is inconsequential. I have
verified that its use in the executable is not causing this behavior
by removing all references to it. I have reduced this to the minimum
amount of code required to reproduce the problem and attached the
Python script an the C code generated by sib.py for the application
main() function.

My guess is that the code that sib.py generates is failing to do
something that Py_Main() would normally do. To that end, I have tried
modifying the main() function in a variety of ways to get it as close
to Py_Main() as I can, but it still exhibits the undesirable behavior
when sys.exit() is called. That pretty much leaves me thinking that
PyImport_ExecCodeModule() or PyImport_ImportFrozenModule() (I have
also looked at Py_FrozenMain() for insight) is the culprit.

Can anyone point me in the right direction for understanding how the
SystemExit exception results in this behavior? My hope is that there
is a change (simple or not) that can be made to the C code for the
frozen executable to resolve the problem.

Thanks in advance.

 -Patrick


-- 
Patrick L. Hartling
http://www.137.org/patrick/
-------------- next part --------------
/*==========================================================================*/
/* Main startup code for test                                               */
/* This is generated code; Do not modify it!                                */
/*--------------------------------------------------------------------------*/
#include <stdarg.h>
#include <Python.h>
#include <marshal.h>
/* #include <vendorid.h> */

extern unsigned char M___main__[];

static struct _frozen _PyImport_FrozenModules[] =
{
    {0, 0, 0} /* sentinel */
};

int main(int argc, char **argv)
{
    PyObject *v, *co;
    PyImport_FrozenModules = _PyImport_FrozenModules;

    Py_SetProgramName((char *)"test");
/*    vendorid_init(); */
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    co = PyMarshal_ReadObjectFromString((char *)M___main__, 655);
    v = PyImport_ExecCodeModule((char *)"__main__", co);
    if(v == NULL)
    {
        PyErr_Print();
        return -1;
    }
    Py_DECREF(v);
    Py_Finalize();
    return 0;
}

/*==========================================================================*/
/* EOF                                                                      */
/*--------------------------------------------------------------------------*/
-------------- next part --------------
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From bearophileHUGS at lycos.com  Fri Feb  6 18:26:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 15:26:57 -0800 (PST)
Subject: Ordered dict by default
References: <mailman.9006.1233954552.3487.python-list@python.org> 
	<dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
Message-ID: <6f38e8bc-4ecd-4b9f-abef-b885cd16b375@p37g2000yqd.googlegroups.com>

bearophile:
> In Python 3 strings are all unicode, integral numbers are all
> multiprecision, chars in Python 2.x+ are strings, lists are arrays
> that can grow dynamically, and so on because the Purpose of Python
> isn't to be as fast as possible, but to be first of all flexible,
> safe, easy, not but-prone, even if other solution or older versions
> were faster.

I have missed another example: It may be possible to create a sorting
routine that's not stable but is faster than the current stable
timsort (for example in C++ STL you have both sorting routines, and
the unstable one is a variant of introsort that is faster than the
stable version). I think Python will keep the stable one, because even
if (in theory. In practice it may be quite difficult to write such
unstable sorter faster than timsort) it can be slower, it's safer and
more useful than an unstable sort.

Bye,
bearophile


From google at mrabarnett.plus.com  Fri Feb  6 18:30:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 23:30:38 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmie0f$3e7$03$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>
	<gmie0f$3e7$03$1@news.t-online.com>
Message-ID: <498CC81E.8050607@mrabarnett.plus.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>> Martin v. L?wis wrote:
>>>>> So does anyone know what the deal is with this?  Why is the
>>>>> same code so much slower on Windows?  Hope someone can tell
>>>>> me before a holy war erupts :-)
>>>> 
>>>> Only the holy war can give an answer here. It certainly has 
>>>> *nothing* to do with Python; Python calls the operating system
>>>> functions to read from the network and write to the disk almost
>>>> directly. So it must be the operating system itself that slows
>>>> it down.
>>>> 
>>>> To investigate further, you might drop the write operating, and
>>>> measure only source.read(). If that is slower, then, for some
>>>> reason, the network speed is bad on Windows. Maybe you have the
>>>> network interfaces misconfigured? Maybe you are using wireless
>>>> on Windows, but cable on Linux? Maybe you have some network
>>>> filtering software running on Windows? Maybe it's just that
>>>> Windows sucks?-)
>>>> 
>>>> If the network read speed is fine, but writing slows down, I
>>>> ask the same questions. Perhaps you have some virus scanner
>>>> installed that filters all write operations? Maybe Windows
>>>> sucks?
>>>> 
>>> Thanks for the ideas, Martin.  I ran a couple of experiments to 
>>> find the culprit, by downloading the same 20 MB file from the
>>> same fast server. I compared:
>>> 
>>> 1.  DL to HD vs USB iPod.
>>> 2.  AV on-access protection on vs. off
>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
>>> 
>>> The culprit is definitely the write speed on the iPod.  That is, 
>>> everything runs plenty fast (~1 MB/s down) as long as I'm not
>>> writing directly to the iPod.  This is kind of odd, because if I
>>> copy the file over from the HD to the iPod using windows
>>> (drag-n-drop), it takes about a second or two, so about 10 MB/s.
>>> 
>>> So the problem is definitely partially Windows, but it also seems
>>> that Python's file.write() function is not without blame.  It's
>>> the combination of Windows, iPod and Python's data stream that is
>>> slowing me down.
>>> 
>>> I'm not really sure what I can do about this.  I'll experiment a
>>> little more and see if there's any way around this bottleneck.
>>> If anyone has run into a problem like this, I'd love to hear
>>> about it...
>>> 
>> You could try copying the file to the iPod using the command line,
>> or copying data from disk to iPod in, say, C, anything but Python.
>> This would allow you to identify whether Python itself has anything
>> to do with it.
> 
> Well, I think I've partially identified the problem.  target.write( 
> source.read() ) runs perfectly fast, copies 20 megs in about a
> second, from HD to iPod.  However, if I run the same code in a while
> loop, using a certain block size, say target.write( source.read(4096)
> ), it takes forever (or at least I'm still timing it while I write
> this post).
> 
> The mismatch seems to be between urllib2's block size and the write 
> speed of the iPod, I might try to tweak this a little in the code and
> see if it has any effect.
> 
> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to
> try to improve that...
> 
How long does it take to transfer 4KB? If it can transfer 1MB/s then I'd
say that 4KB is too small. Generally speaking, the higher the data rate,
the larger the blocks you should be transferring at a time, IMHO.

You could write a script to test the transfer speed with different block
sizes.


From google at mrabarnett.plus.com  Fri Feb  6 18:34:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 23:34:49 +0000
Subject: Ordered dict by default
In-Reply-To: <dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
References: <mailman.9006.1233954552.3487.python-list@python.org>
	<dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
Message-ID: <498CC919.8000208@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> Cameron Simpson:
> 
>> increases the unrealised assumptions about mappings in general
>> which a newbie may acquire, causing them pain/complaint later with
>> other mappings<
> 
> This is wrong in several different ways.
> 
>> I would much rather keep dictionaries as performant as possible, as
>> a bare mapping, and add an odict for when order matters.
> 
> In Python 3 strings are all unicode, integral numbers are all 
> multiprecision, chars in Python 2.x+ are strings, lists are arrays 
> that can grow dynamically, and so on because the Purpose of Python 
> isn't to be as fast as possible, but to be first of all flexible, 
> safe, easy, not but-prone, even if other solution or older versions 
> were faster. Ruby shares almost same purposes.
> 
> I presume Ruby wants to become a bit higher level than Python,
> because it now has a more flexible built-in. But even in a language
> designed to run way faster than Python, like D, I think the right
> thing for built-ins is to be as flexible&easy as possible, so they
> are good enough in as many situations as possible, where performance
> isn't the most important thing, and to put the more specialized and
> faster versions into external libs. Making the built-ins be as
> optimized as possible (but limited too) looks like premature
> optimization to me, and in a language like Python premature
> optimization looks even more silly than usual.
> 
You'll be wanting ordered sets next! :-)


From dq at gmail.com  Fri Feb  6 18:36:02 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 00:36:02 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmie0f$3e7$03$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>
	<mailman.9008.1233957283.3487.python-list@python.org>
	<gmie0f$3e7$03$1@news.t-online.com>
Message-ID: <gmihh4$o2b$02$1@news.t-online.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>  > Martin v. L?wis wrote:
>>  >>> So does anyone know what the deal is with this?  Why is the same 
>> code so
>>  >>> much slower on Windows?  Hope someone can tell me before a holy war
>>  >>> erupts :-)
>>  >>
>>  >> Only the holy war can give an answer here. It certainly has 
>> *nothing* to
>>  >> do with Python; Python calls the operating system functions to 
>> read from
>>  >> the network and write to the disk almost directly. So it must be the
>>  >> operating system itself that slows it down.
>>  >>
>>  >> To investigate further, you might drop the write operating, and 
>> measure
>>  >> only source.read(). If that is slower, then, for some reason, the
>>  >> network speed is bad on Windows. Maybe you have the network 
>> interfaces
>>  >> misconfigured? Maybe you are using wireless on Windows, but cable on
>>  >> Linux? Maybe you have some network filtering software running on
>>  >> Windows? Maybe it's just that Windows sucks?-)
>>  >>
>>  >> If the network read speed is fine, but writing slows down, I ask the
>>  >> same questions. Perhaps you have some virus scanner installed that
>>  >> filters all write operations? Maybe Windows sucks?
>>  >>
>>  >> Regards,
>>  >> Martin
>>  >>
>>  >
>>  > Thanks for the ideas, Martin.  I ran a couple of experiments to 
>> find the
>>  > culprit, by downloading the same 20 MB file from the same fast 
>> server. I
>>  > compared:
>>  >
>>  > 1.  DL to HD vs USB iPod.
>>  > 2.  AV on-access protection on vs. off
>>  > 3.  "source. read()" only vs.  "file.write( source.read() )"
>>  >
>>  > The culprit is definitely the write speed on the iPod.  That is,
>>  > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
>>  > directly to the iPod.  This is kind of odd, because if I copy the file
>>  > over from the HD to the iPod using windows (drag-n-drop), it takes 
>> about
>>  > a second or two, so about 10 MB/s.
>>  >
>>  > So the problem is definitely partially Windows, but it also seems that
>>  > Python's file.write() function is not without blame.  It's the
>>  > combination of Windows, iPod and Python's data stream that is 
>> slowing me
>>  > down.
>>  >
>>  > I'm not really sure what I can do about this.  I'll experiment a 
>> little
>>  > more and see if there's any way around this bottleneck.  If anyone has
>>  > run into a problem like this, I'd love to hear about it...
>>  >
>> You could try copying the file to the iPod using the command line, or
>> copying data from disk to iPod in, say, C, anything but Python. This
>> would allow you to identify whether Python itself has anything to do
>> with it.
> 
> Well, I think I've partially identified the problem.  target.write( 
> source.read() ) runs perfectly fast, copies 20 megs in about a second, 
> from HD to iPod.  However, if I run the same code in a while loop, using 
> a certain block size, say target.write( source.read(4096) ), it takes 
> forever (or at least I'm still timing it while I write this post).
> 
> The mismatch seems to be between urllib2's block size and the write 
> speed of the iPod, I might try to tweak this a little in the code and 
> see if it has any effect.
> 
> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to 
> try to improve that...

After some tweaking of the block size, I managed to get the DL speed up 
to about 900 Mb/s.  It's still not quite Ubuntu, but it's a good order 
of magnitude better.  The new DL code is pretty much this:

"""
blocksize = 2 ** 16    # plus or minus a power of 2
source = urllib2.urlopen( 'url://string' )
target = open( pathname, 'wb')
fullsize = float( source.info()['Content-Length'] )
DLd = 0
while DLd < fullsize:
	DLd = DLd + blocksize
	# optional:  write some DL progress info
	# somewhere, e.g. stdout
target.close()
source.close()
"""


	
	





From dq at gmail.com  Fri Feb  6 18:40:00 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 00:40:00 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9015.1233963041.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>
	<mailman.9015.1233963041.3487.python-list@python.org>
Message-ID: <gmihoi$o2b$02$2@news.t-online.com>

MRAB wrote:
> dq wrote:
>> MRAB wrote:
>>> dq wrote:
>>>> Martin v. L?wis wrote:
>>>>>> So does anyone know what the deal is with this?  Why is the
>>>>>> same code so much slower on Windows?  Hope someone can tell
>>>>>> me before a holy war erupts :-)
>>>>>
>>>>> Only the holy war can give an answer here. It certainly has 
>>>>> *nothing* to do with Python; Python calls the operating system
>>>>> functions to read from the network and write to the disk almost
>>>>> directly. So it must be the operating system itself that slows
>>>>> it down.
>>>>>
>>>>> To investigate further, you might drop the write operating, and
>>>>> measure only source.read(). If that is slower, then, for some
>>>>> reason, the network speed is bad on Windows. Maybe you have the
>>>>> network interfaces misconfigured? Maybe you are using wireless
>>>>> on Windows, but cable on Linux? Maybe you have some network
>>>>> filtering software running on Windows? Maybe it's just that
>>>>> Windows sucks?-)
>>>>>
>>>>> If the network read speed is fine, but writing slows down, I
>>>>> ask the same questions. Perhaps you have some virus scanner
>>>>> installed that filters all write operations? Maybe Windows
>>>>> sucks?
>>>>>
>>>> Thanks for the ideas, Martin.  I ran a couple of experiments to find 
>>>> the culprit, by downloading the same 20 MB file from the
>>>> same fast server. I compared:
>>>>
>>>> 1.  DL to HD vs USB iPod.
>>>> 2.  AV on-access protection on vs. off
>>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
>>>>
>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>> everything runs plenty fast (~1 MB/s down) as long as I'm not
>>>> writing directly to the iPod.  This is kind of odd, because if I
>>>> copy the file over from the HD to the iPod using windows
>>>> (drag-n-drop), it takes about a second or two, so about 10 MB/s.
>>>>
>>>> So the problem is definitely partially Windows, but it also seems
>>>> that Python's file.write() function is not without blame.  It's
>>>> the combination of Windows, iPod and Python's data stream that is
>>>> slowing me down.
>>>>
>>>> I'm not really sure what I can do about this.  I'll experiment a
>>>> little more and see if there's any way around this bottleneck.
>>>> If anyone has run into a problem like this, I'd love to hear
>>>> about it...
>>>>
>>> You could try copying the file to the iPod using the command line,
>>> or copying data from disk to iPod in, say, C, anything but Python.
>>> This would allow you to identify whether Python itself has anything
>>> to do with it.
>>
>> Well, I think I've partially identified the problem.  target.write( 
>> source.read() ) runs perfectly fast, copies 20 megs in about a
>> second, from HD to iPod.  However, if I run the same code in a while
>> loop, using a certain block size, say target.write( source.read(4096)
>> ), it takes forever (or at least I'm still timing it while I write
>> this post).
>>
>> The mismatch seems to be between urllib2's block size and the write 
>> speed of the iPod, I might try to tweak this a little in the code and
>> see if it has any effect.
>>
>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to
>> try to improve that...
>>
> How long does it take to transfer 4KB? If it can transfer 1MB/s then I'd
> say that 4KB is too small. Generally speaking, the higher the data rate,
> the larger the blocks you should be transferring at a time, IMHO.
> 
> You could write a script to test the transfer speed with different block
> sizes.

Thanks MRAB, 32 or 64 KB seems to be quickest, but I'll do a more 
scientific test soon and see what turns up.


From mensanator at aol.com  Fri Feb  6 18:55:14 2009
From: mensanator at aol.com (Mensanator)
Date: Fri, 6 Feb 2009 15:55:14 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
Message-ID: <9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>

On Feb 6, 3:23?pm, Rhamphoryncus <rha... at gmail.com> wrote:
> On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > >flatten generic iterables or only lists).
>
> > > Of course, once you do that, you need to special-case strings...
>
> > Strings are iterable but have no __iter__ method, which is fine in
> > this context, since I would say 99.9% of times one wants to treat them
> > as atomic objects, so no need to special case.
>
> Don't worry, that little oddity was fixed for you:
>
> Python 3.0+ (unknown, Dec ?8 2008, 14:26:15)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> str.__iter__
>
> <slot wrapper '__iter__' of 'str' objects>>>> bytes.__iter__
>
> <slot wrapper '__iter__' of 'bytes' objects>>>> bytearray.__iter__
>
> <slot wrapper '__iter__' of 'bytearray' objects>
>
> I'm in the "why do you need more than 1 depth?" camp. ?Dispatching
> based on your own type should be given an extra look. ?Dispatching
> based passed in types should be given three extra looks.
>
> I didn't realize itertools.chain(*iterable) worked. ?I guess that
> needs to be pushed as the canonical form.

What about this (from the Recipes section of the itertools manual)?

def flatten(listOfLists):
    return list(chain.from_iterable(listOfLists))


From ihatespam at hotmail.com  Fri Feb  6 19:23:32 2009
From: ihatespam at hotmail.com (Just Another Victim of the Ambient Morality)
Date: Fri, 6 Feb 2009 19:23:32 -0500
Subject: Why doesn't this RE match?
Message-ID: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>

    I'm confused by this behaviour:


import re

regex = re.compile('foo')
match = regex.match('whatfooever')


    In my experience with regular expressions, regex should have found a 
match.  However, in this case regex.match() returns None.  Why is that? 
What am I missing?
    Thank you...





From google at mrabarnett.plus.com  Fri Feb  6 19:26:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 00:26:40 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmihh4$o2b$02$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>
	<gmihh4$o2b$02$1@news.t-online.com>
Message-ID: <498CD540.1080407@mrabarnett.plus.com>

dq wrote:
 > dq wrote:
 >> MRAB wrote:
 >>> dq wrote:
 >>>> Martin v. L?wis wrote:
 >>>>>> So does anyone know what the deal is with this?  Why is the
 >>>>>> same code so much slower on Windows?  Hope someone can tell
 >>>>>> me before a holy war erupts :-)
 >>>>>
 >>>>> Only the holy war can give an answer here. It certainly has
 >>>>> *nothing* to do with Python; Python calls the operating
 >>>>> system functions to read from the network and write to the
 >>>>> disk almost directly. So it must be the operating system
 >>>>> itself that slows it down.
 >>>>>
 >>>>> To investigate further, you might drop the write operating,
 >>>>> and measure only source.read(). If that is slower, then, for
 >>>>> some reason, the network speed is bad on Windows. Maybe you
 >>>>> have the network interfaces misconfigured? Maybe you are
 >>>>> using wireless on Windows, but cable on Linux? Maybe you have
 >>>>> some network filtering software running on Windows? Maybe
 >>>>> it's just that Windows sucks?-)
 >>>>>
 >>>>> If the network read speed is fine, but writing slows down, I
 >>>>> ask the same questions. Perhaps you have some virus scanner
 >>>>> installed that filters all write operations? Maybe Windows
 >>>>> sucks?
 >>>>>
 >>>>> Regards, Martin
 >>>>>
 >>>>
 >>>> Thanks for the ideas, Martin.  I ran a couple of experiments to
 >>>> find the culprit, by downloading the same 20 MB file from the
 >>>> same fast server. I compared:
 >>>>
 >>>> 1.  DL to HD vs USB iPod.
 >>>> 2.  AV on-access protection on vs. off
 >>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
 >>>>
 >>>> The culprit is definitely the write speed on the iPod.  That
 >>>> is, everything runs plenty fast (~1 MB/s down) as long as I'm
 >>>> not writing directly to the iPod.  This is kind of odd, because
 >>>> if I copy the file over from the HD to the iPod using windows
 >>>> (drag-n-drop), it takes about a second or two, so about 10
 >>>> MB/s.
 >>>>
 >>>> So the problem is definitely partially Windows, but it also
 >>>> seems that Python's file.write() function is not without blame.
 >>>> It's the combination of Windows, iPod and Python's data stream
 >>>> that is slowing me down.
 >>>>
 >>>> I'm not really sure what I can do about this.  I'll experiment
 >>>> a little more and see if there's any way around this
 >>>> bottleneck.  If anyone has run into a problem like this, I'd
 >>>> love to hear about it...
 >>>>
 >>> You could try copying the file to the iPod using the command
 >>> line, or copying data from disk to iPod in, say, C, anything but
 >>> Python. This would allow you to identify whether Python itself
 >>> has anything to do with it.
 >>
 >> Well, I think I've partially identified the problem.  target.write(
 >> source.read() ) runs perfectly fast, copies 20 megs in about a
 >> second, from HD to iPod.  However, if I run the same code in a
 >> while loop, using a certain block size, say target.write(
 >> source.read(4096) ), it takes forever (or at least I'm still timing
 >> it while I write this post).
 >>
 >> The mismatch seems to be between urllib2's block size and the write
 >> speed of the iPod, I might try to tweak this a little in the code
 >> and see if it has any effect.
 >>
 >> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want
 >> to try to improve that...
 >
 > After some tweaking of the block size, I managed to get the DL speed
 > up to about 900 Mb/s.  It's still not quite Ubuntu, but it's a good
 > order of magnitude better.  The new DL code is pretty much this:
 >
 > """
 > blocksize = 2 ** 16    # plus or minus a power of 2
 > source = urllib2.urlopen( 'url://string' )
 > target = open( pathname, 'wb')
 > fullsize = float( source.info()['Content-Length'] )
 > DLd = 0
 > while DLd < fullsize:
 >     DLd = DLd + blocksize
 >     # optional:  write some DL progress info
 >     # somewhere, e.g. stdout
 > target.close()
 > source.close()
 > """
 >
I'd like to suggest that the block size you add to 'DLd' be the actual 
size of the returned block, just in case the read() doesn't return all 
you asked for (it might not be guaranteed, and the chances are that the
final block will be shorter, unless 'fullsize' happens to be a multiple
of 'blocksize').

If less is returned by read() then the while-loop might finish before
all the data has been downloaded, and if you just add 'blocksize' each
time it might end up > 'fullsize', ie apparently >100% downloaded!


From vlastimil.brom at gmail.com  Fri Feb  6 19:34:05 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 7 Feb 2009 01:34:05 +0100
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <9fdb569a0902061634u3488d8ebs37ea5132f0438ac0@mail.gmail.com>

2009/2/7 Just Another Victim of the Ambient Morality <ihatespam at hotmail.com>:
> ? ?I'm confused by this behaviour:
>
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
>
> ? ?In my experience with regular expressions, regex should have found a
> match. ?However, in this case regex.match() returns None. ?Why is that?
> What am I missing?
> ? ?Thank you...
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Try re.search() instead of match(), if nod only the beginning should
be checked for a match:
see
http://docs.python.org/library/re.html#matching-vs-searching

vbr


From google at mrabarnett.plus.com  Fri Feb  6 19:34:52 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 00:34:52 +0000
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <498CD72C.9010808@mrabarnett.plus.com>

Just Another Victim of the Ambient Morality wrote:
>     I'm confused by this behaviour:
> 
> 
> import re
> 
> regex = re.compile('foo')
> match = regex.match('whatfooever')
> 
> 
>     In my experience with regular expressions, regex should have found a 
> match.  However, in this case regex.match() returns None.  Why is that? 
> What am I missing?
>     Thank you...
> 
match() is anchored at (ie matches only at) the start of the string. You
need search(). It's in the docs! :-)


From apt.shansen at gmail.com  Fri Feb  6 19:34:54 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 16:34:54 -0800
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <7a9c25c20902061634o19210809la6573b54ba4528c9@mail.gmail.com>

>    In my experience with regular expressions, regex should have found a
> match.  However, in this case regex.match() returns None.  Why is that?
> What am I missing?

You want regex.search(). match specifically looks for the pattern from
the start of the screen, search anywhere.

--S


From robert.kern at gmail.com  Fri Feb  6 19:38:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 06 Feb 2009 18:38:16 -0600
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <gmil5p$ieh$1@ger.gmane.org>

On 2009-02-06 18:23, Just Another Victim of the Ambient Morality wrote:
>      I'm confused by this behaviour:
>
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
>
>      In my experience with regular expressions, regex should have found a
> match.  However, in this case regex.match() returns None.  Why is that?
> What am I missing?

http://docs.python.org/library/re#re.RegexObject.match

Basically, regex.match() tries to apply the regexp to the beginning of the 
string. Use regex.search() to search for a match later in the string.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bthayre at physics.ucsd.edu  Fri Feb  6 19:43:48 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 16:43:48 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com> 
	<mailman.9013.1233960096.3487.python-list@python.org>
Message-ID: <1325a031-2f3a-4e79-b7c9-0da32fbdee16@p23g2000prp.googlegroups.com>

On Feb 6, 2:41?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > I think there may have been a misunderstanding. ?I was already using
> > attrgetter, my problem is that it doesn't appear to be sorting by the
> > argument i give it. ?How does sort work with strings? ?How about with
> > datetime.time or datetime.date?
>
> You were using the attrgetter, but it looks like you weren't doing it correctly:
>
> ? ? timesheets.sort(key=operator.attrgetter('string'))
>
> You don't specify a type, be it string or date or anything: you
> specify the /name/ of the attribute to get. It'll handle sorting by
> any data type that has an order to it without you having to worry
> about it at all. Strings, ints, dates, times.
>
> It should be:
>
> ? ?timesheets.sort(key=operator.attrgetter("department"))
>
> If you want to sort by the value of the "department" attribute, which
> happens to be a string.
> If you want to sort by the "date" attribute, which happens to be a
> datetime.date, you do:
> ? ?timesheets.sort(key=operator.attrgetter("date"))
>
> Where date is not a datatype a la datetime.date, but the name of an
> attribute on your TimeSheet instances.
>
> --S

Yeah this i totally understand.  In my code i was using attrgetter
correctly, in the above answer i used string to represent the datatype
of the attribute, not what i actually put in there.  More my laziness
than anything else.  The problem boiled down attrgetter taking
multiple arguments in 2.5, but only one in 2.4.  Thanks for the input
though.


From sjmachin at lexicon.net  Fri Feb  6 19:55:41 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 16:55:41 -0800 (PST)
Subject: Why doesn't this RE match?
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <e0b51d87-2f2b-4f28-9769-5bd8ee0d0ddd@40g2000prx.googlegroups.com>

On Feb 7, 11:23?am, "Just Another Victim of the Ambient Morality"
<ihates... at hotmail.com> wrote:
> ? ? I'm confused by this behaviour:
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
> ? ? In my experience with regular expressions, regex should have found a
> match. ?However, in this case regex.match() returns None. ?Why is that?

Because that is exactly what it is documented to do.

> What am I missing?

Inter alia:
(1) The whole section of the fantastic manual devoted to this topic:
http://www.python.org/doc/2.6/library/re.html#matching-vs-searching

(2) a section in the fabulous HOWTO:
http://www.python.org/doc/2.6/howto/regex.html#performing-matches

(3) the re section in the phantasmagorical help sub-system (very handy
if your internet connection goes on the fritz):

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> help(re)
Help on module re:
[snip]
    This module exports the following functions:
        match    Match a regular expression pattern to the beginning
of a string.
        search   Search a string for the presence of a pattern.
[snip]


From kenneth.m.mcdonald at sbcglobal.net  Fri Feb  6 19:58:01 2009
From: kenneth.m.mcdonald at sbcglobal.net (Kenneth McDonald)
Date: Fri, 6 Feb 2009 18:58:01 -0600
Subject: Possible to access MS Access 2007 password-protected database from
	Python?
Message-ID: <032DE756-C4E7-40E5-BE8F-D959EACD024B@sbcglobal.net>

Googling has shown me various ways of connecting to a non-password- 
protected Access database, but I was wondering if someone could point  
to code illustrating how to use an Access db that's password- 
protected. I haven't been able to find anything on this.

Thanks,
Ken


From dq at gmail.com  Fri Feb  6 20:51:13 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 02:51:13 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9017.1233966405.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>
	<mailman.9017.1233966405.3487.python-list@python.org>
Message-ID: <gmipei$7s0$02$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>> dq wrote:
>>> MRAB wrote:
>>>> dq wrote:
>>>>> Martin v. L?wis wrote:
>>>>>>> So does anyone know what the deal is with this?  Why is 
>>>>>>> the same code so much slower on Windows?  Hope someone 
>>>>>>> can tell me before a holy war erupts :-)
>>>>>> 
>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>  *nothing* to do with Python; Python calls the operating 
>>>>>> system functions to read from the network and write to the 
>>>>>> disk almost directly. So it must be the operating system 
>>>>>> itself that slows it down.
>>>>>> 
>>>>>> To investigate further, you might drop the write operating,
>>>>>>  and measure only source.read(). If that is slower, then, 
>>>>>> for some reason, the network speed is bad on Windows. Maybe
>>>>>>  you have the network interfaces misconfigured? Maybe you 
>>>>>> are using wireless on Windows, but cable on Linux? Maybe 
>>>>>> you have some network filtering software running on 
>>>>>> Windows? Maybe it's just that Windows sucks?-)
>>>>>> 
>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>  I ask the same questions. Perhaps you have some virus 
>>>>>> scanner installed that filters all write operations? Maybe
>>>>>>  Windows sucks?
>>>>>> 
>>>>>> Regards, Martin
>>>>>> 
>>>>> 
>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>  the same fast server. I compared:
>>>>> 
>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>> source.read() )"
>>>>> 
>>>>> The culprit is definitely the write speed on the iPod.  That 
>>>>> is, everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>> not writing directly to the iPod.  This is kind of odd, 
>>>>> because if I copy the file over from the HD to the iPod using
>>>>>  windows (drag-n-drop), it takes about a second or two, so 
>>>>> about 10 MB/s.
>>>>> 
>>>>> So the problem is definitely partially Windows, but it also 
>>>>> seems that Python's file.write() function is not without 
>>>>> blame. It's the combination of Windows, iPod and Python's 
>>>>> data stream that is slowing me down.
>>>>> 
>>>>> I'm not really sure what I can do about this.  I'll 
>>>>> experiment a little more and see if there's any way around 
>>>>> this bottleneck.  If anyone has run into a problem like this,
>>>>>  I'd love to hear about it...
>>>>> 
>>>> You could try copying the file to the iPod using the command 
>>>> line, or copying data from disk to iPod in, say, C, anything 
>>>> but Python. This would allow you to identify whether Python 
>>>> itself has anything to do with it.
>>> 
>>> Well, I think I've partially identified the problem. 
>>> target.write( source.read() ) runs perfectly fast, copies 20 megs
>>>  in about a second, from HD to iPod.  However, if I run the same
>>>  code in a while loop, using a certain block size, say 
>>> target.write( source.read(4096) ), it takes forever (or at least
>>>  I'm still timing it while I write this post).
>>> 
>>> The mismatch seems to be between urllib2's block size and the 
>>> write speed of the iPod, I might try to tweak this a little in 
>>> the code and see if it has any effect.
>>> 
>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might 
>>> want to try to improve that...
>> 
>> After some tweaking of the block size, I managed to get the DL 
>> speed up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>  a good order of magnitude better.  The new DL code is pretty much
>>  this:
>> 
>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while 
>> DLd < fullsize: DLd = DLd + blocksize # optional:  write some DL 
>> progress info # somewhere, e.g. stdout target.close() 
>> source.close() """
>> 
> I'd like to suggest that the block size you add to 'DLd' be the 
> actual size of the returned block, just in case the read() doesn't 
> return all you asked for (it might not be guaranteed, and the chances
>  are that the final block will be shorter, unless 'fullsize' happens
>  to be a multiple of 'blocksize').
> 
> If less is returned by read() then the while-loop might finish before
>  all the data has been downloaded, and if you just add 'blocksize' 
> each time it might end up > 'fullsize', ie apparently >100% 
> downloaded!

Interesting.  I'll if to see if any of the downloaded files end 
prematurely :)

btw, I forgot the most important line of the code!

"""
blocksize = 2 ** 16    # plus or minus a power of 2
source = urllib2.urlopen( 'url://string' )
target = open( pathname, 'wb')
fullsize = float( source.info()['Content-Length'] )
DLd = 0
while DLd < fullsize:
     #  +++
     target.write( source.read( blocksize ) )  # +++
     #  +++
     DLd = DLd + blocksize
     # optional:  write some DL progress info
     # somewhere, e.g. stdout
target.close()
source.close()
"""

Using that, I'm not quite sure where I can grab onto the value of how 
much was actually read from the block.  I suppose I could use an 
intermediate variable, read the data into it, measure the size, and then 
write it to the file stream, but I'm not sure it would be worth the 
overhead.  Or is there some other magic I should know about?

If I start to get that problem, at least I'll know where to look...


From jason at jvoegele.com  Fri Feb  6 21:11:15 2009
From: jason at jvoegele.com (Jason Voegele)
Date: Fri, 06 Feb 2009 21:11:15 -0500
Subject: Running all unit tests
Message-ID: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>

I'm working on my first substantial Python project, and I'm following a fully 
test-first approach.  I'd like to know how Pythonistas typically go about 
running all of their tests to ensure that my application stays "green".

In Ruby, I would have a Rake task so that I could say "rake test" and all 
tests would be executed.  In C or C++ I would have a make target so I could 
run all my tests with "make test".  In Java it would be an Ant task and "ant 
test".  And so forth and so on.

What's the recommended approach for Python programs?  I'm sure I could write 
a shell script (or a Python script even) that scans my "test" directory for 
test cases and runs them, but I'm wondering if there's something already 
built in that could do this for me.

-- 
Jason Voegele
Only fools are quoted.
		-- Anonymous




From google at mrabarnett.plus.com  Fri Feb  6 21:28:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 02:28:09 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmipei$7s0$02$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>	<mailman.9017.1233966405.3487.python-list@python.org>
	<gmipei$7s0$02$1@news.t-online.com>
Message-ID: <498CF1B9.70101@mrabarnett.plus.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>> dq wrote:
>>>> MRAB wrote:
>>>>> dq wrote:
>>>>>> Martin v. L?wis wrote:
>>>>>>>> So does anyone know what the deal is with this?  Why is the same 
>>>>>>>> code so much slower on Windows?  Hope someone can tell me before 
>>>>>>>> a holy war erupts :-)
>>>>>>>
>>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>>  *nothing* to do with Python; Python calls the operating system 
>>>>>>> functions to read from the network and write to the disk almost 
>>>>>>> directly. So it must be the operating system itself that slows it 
>>>>>>> down.
>>>>>>>
>>>>>>> To investigate further, you might drop the write operating,
>>>>>>>  and measure only source.read(). If that is slower, then, for 
>>>>>>> some reason, the network speed is bad on Windows. Maybe
>>>>>>>  you have the network interfaces misconfigured? Maybe you are 
>>>>>>> using wireless on Windows, but cable on Linux? Maybe you have 
>>>>>>> some network filtering software running on Windows? Maybe it's 
>>>>>>> just that Windows sucks?-)
>>>>>>>
>>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>>  I ask the same questions. Perhaps you have some virus scanner 
>>>>>>> installed that filters all write operations? Maybe
>>>>>>>  Windows sucks?
>>>>>>>
>>>>>>> Regards, Martin
>>>>>>>
>>>>>>
>>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>>  the same fast server. I compared:
>>>>>>
>>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>>> source.read() )"
>>>>>>
>>>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>>>> everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>>> not writing directly to the iPod.  This is kind of odd, because if 
>>>>>> I copy the file over from the HD to the iPod using
>>>>>>  windows (drag-n-drop), it takes about a second or two, so about 
>>>>>> 10 MB/s.
>>>>>>
>>>>>> So the problem is definitely partially Windows, but it also seems 
>>>>>> that Python's file.write() function is not without blame. It's the 
>>>>>> combination of Windows, iPod and Python's data stream that is 
>>>>>> slowing me down.
>>>>>>
>>>>>> I'm not really sure what I can do about this.  I'll experiment a 
>>>>>> little more and see if there's any way around this bottleneck.  If 
>>>>>> anyone has run into a problem like this,
>>>>>>  I'd love to hear about it...
>>>>>>
>>>>> You could try copying the file to the iPod using the command line, 
>>>>> or copying data from disk to iPod in, say, C, anything but Python. 
>>>>> This would allow you to identify whether Python itself has anything 
>>>>> to do with it.
>>>>
>>>> Well, I think I've partially identified the problem. target.write( 
>>>> source.read() ) runs perfectly fast, copies 20 megs
>>>>  in about a second, from HD to iPod.  However, if I run the same
>>>>  code in a while loop, using a certain block size, say target.write( 
>>>> source.read(4096) ), it takes forever (or at least
>>>>  I'm still timing it while I write this post).
>>>>
>>>> The mismatch seems to be between urllib2's block size and the write 
>>>> speed of the iPod, I might try to tweak this a little in the code 
>>>> and see if it has any effect.
>>>>
>>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want 
>>>> to try to improve that...
>>>
>>> After some tweaking of the block size, I managed to get the DL speed 
>>> up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>>  a good order of magnitude better.  The new DL code is pretty much
>>>  this:
>>>
>>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while DLd 
>>> < fullsize: DLd = DLd + blocksize # optional:  write some DL progress 
>>> info # somewhere, e.g. stdout target.close() source.close() """
>>>
>> I'd like to suggest that the block size you add to 'DLd' be the actual 
>> size of the returned block, just in case the read() doesn't return all 
>> you asked for (it might not be guaranteed, and the chances
>>  are that the final block will be shorter, unless 'fullsize' happens
>>  to be a multiple of 'blocksize').
>>
>> If less is returned by read() then the while-loop might finish before
>>  all the data has been downloaded, and if you just add 'blocksize' 
>> each time it might end up > 'fullsize', ie apparently >100% downloaded!
> 
> Interesting.  I'll if to see if any of the downloaded files end 
> prematurely :)
> 
> btw, I forgot the most important line of the code!
> 
> """
> blocksize = 2 ** 16    # plus or minus a power of 2
> source = urllib2.urlopen( 'url://string' )
> target = open( pathname, 'wb')
> fullsize = float( source.info()['Content-Length'] )
> DLd = 0
> while DLd < fullsize:
>     #  +++
>     target.write( source.read( blocksize ) )  # +++
>     #  +++
>     DLd = DLd + blocksize
>     # optional:  write some DL progress info
>     # somewhere, e.g. stdout
> target.close()
> source.close()
> """
> 
> Using that, I'm not quite sure where I can grab onto the value of how 
> much was actually read from the block.  I suppose I could use an 
> intermediate variable, read the data into it, measure the size, and then 
> write it to the file stream, but I'm not sure it would be worth the 
> overhead.  Or is there some other magic I should know about?
> 
> If I start to get that problem, at least I'll know where to look...
> 
It's just:

     data = source.read(blocksize)
     target.write(data)
     DLd = DLd + len(data)

The overhead is tiny because you're not copying the data.

If 'x' refers to a 1MB bytestring and you do "y = x" or "foo(x)", you're 
not actually copying that bytestring; you're just making 'y' also refer 
to it or passing the reference to it into 'foo'. It's a bit passing 
pointers around, but without the nasty bits! :-)


From mdw at distorted.org.uk  Fri Feb  6 21:42:44 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Sat, 07 Feb 2009 02:42:44 +0000
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
Message-ID: <874oz7klwb.fsf.mdw@metalzone.distorted.org.uk>

Duncan Booth <duncan.booth at invalid.invalid> writes:

> Mark Dickinson <dickinsm at gmail.com> wrote:
[snip]
>>     while n:
>>         count += 1
>>         n &= n-1
>>     return count
>> 
>> is_even = count_set_bits(the_int) % 2 == 0
>> 
>> ...but anyone submitting this as a homework
>> solution had better be prepared to explain why
>> it works.
>> 
>
> I remember a programming exercise when I was an undergraduate and anyone 
> who *didn't* use that trick got marked down for writing inefficient
> code.

Curious.  I don't see why

        def parity(x):
          b = 2
          l = 1
          while True:
            b <<= l
            if x < b: break
            l <<= 1
          while l:
            b >>= l
            x ^= x >> l
            x &= b - 1
            l >>= 1
          return x & 1

is any less efficient.  Indeed, it seems more so to me.  The number of
top-level loop iterations is bounded by the logarithm of the total
number of bits in the input rather than the Hamming weight.  In terms of
single-precision operations (if we're dealing with bignums) the analysis
is more complicated; but the number of single-precision operations in
one of my loops is a linear function of l (assuming that the comparison
is done sensibly), and l increases and decreases geometrically, so I
have performance which is O(log x).  Assuming no special Hamming-weight
distribution on the input, the `efficient' version takes O(log^2 x)
single-precision operations.

Given an /a-priori/ upper bound on the length of the input, e.g., it
fits in a machine word, the above technique is still probably faster.
That is, assuming arithmetic and bitwise operations on integers take
constant time, my version runs in O(log log x) time whereas the
`efficient' version takes O(log x) time.

(My function returns the complement of the value requested.  Fixing it
is obviously trivial.)

-- [mdw]


From vlastimil.brom at gmail.com  Fri Feb  6 21:45:10 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 7 Feb 2009 03:45:10 +0100
Subject: sys.exc_info() different between python 2.5.4 and 2.6.1?
Message-ID: <9fdb569a0902061845k31cffbb4l28927c2fc8ecb3a9@mail.gmail.com>

Hi all,
I just noticed a changed behaviour of sys.exc_info() between python
2.5.4 and 2.6.1 and wanted to ask, wheter it was intended, and how to
deal with the new state.

Some code triggers an error while opening a text file (windows 1250 -
with non-ascii characters) wrongly as utf-8,
this gets catched by a bare except clause.
Further the mentioned versions of python differ in handling sys.exc_info()
The following lines:
print sys.exc_info()[1]
print repr(sys.exc_info()[1])
print str(sys.exc_info()[1])
print unicode(sys.exc_info()[1])

result in python 2.5 in:

'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
UnicodeDecodeError('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte

in python 2.6 it is:
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
UnicodeDecodeError('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')

Which is kind of confusing as my the excepthook function uses the
unicode() form of sys.exc_info()[1]
(The second part "ab\x9acd" is the whole content of the file being
read - which is normally quite a bit longer than this sample...)

Is this the expected behaviour? If so, what might be the reason for
differently outputting str() and unicode()?
How can this be dealt with, are the standard error values somehow
expected to be ascii, so that str() can be used reasonably?

Any hints are much appreciated,
  Vlasta


From darcymason at gmail.com  Fri Feb  6 21:46:39 2009
From: darcymason at gmail.com (Darcy Mason)
Date: Fri, 6 Feb 2009 18:46:39 -0800 (PST)
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <77db8f43-3196-41c9-bbfe-f7da9c27c4a6@r41g2000yqm.googlegroups.com>

On Feb 6, 9:11?pm, Jason Voegele <ja... at jvoegele.com> wrote:
> I'm working on my first substantial Python project, and I'm following a fully
> test-first approach. ?I'd like to know how Pythonistas typically go about
> running all of their tests to ensure that my application stays "green".
>
> In Ruby, I would have a Rake task so that I could say "rake test" and all
> tests would be executed. ?In C or C++ I would have a make target so I could
> run all my tests with "make test". ?In Java it would be an Ant task and "ant
> test". ?And so forth and so on.
>
> What's the recommended approach for Python programs? ?I'm sure I could write
> a shell script (or a Python script even) that scans my "test" directory for
> test cases and runs them, but I'm wondering if there's something already
> built in that could do this for me.
>
> --
> Jason Voegele
> Only fools are quoted.
> ? ? ? ? ? ? ? ? -- Anonymous

I don't know about the recommended approach, but I've done something
like you suggest in a library I authored. Any files named test*.py are
found and added to the unittest test suite.
See http://code.google.com/p/pydicom/source/browse/trunk/source/dicom/test/run_tests.py.
HTH
Darcy


From darcy at druid.net  Fri Feb  6 21:52:29 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 6 Feb 2009 21:52:29 -0500
Subject: Running all unit tests
In-Reply-To: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <20090206215229.f0951075.darcy@druid.net>

On Fri, 06 Feb 2009 21:11:15 -0500
Jason Voegele <jason at jvoegele.com> wrote:
> I'm working on my first substantial Python project, and I'm following a fully 
> test-first approach.  I'd like to know how Pythonistas typically go about 
> running all of their tests to ensure that my application stays "green".

I check in my unit tests to CVS along with the code and name the unit
test files with the form "TEST_xxx.py" to identify them.  I then put
the following script into my crontab so that my tests are run every
day.  I make the TEST_xxx.py executible so that I can always run a
specific test at any time if I am working on specific code.

Note that the script only sends email when something goes "red" so I
don't have to wade through "green" reports every day.  The errors stand
out that way.

#! /bin/sh
# $Id: run_unit_tests,v 1.4 2008/06/23 01:07:24 darcy Exp $

# This script runs all of the unit tests

if [ $# -lt 2 ]
then
    echo "Usage: $0 <base directory> [<email address>]"
    exit 1
fi

cd $1
trap "rm -f /tmp/run_tests.$$" 0
HOST=`hostname`

find -L . -type f -name 'TEST_*.py' | while read TEST
do
    $TEST > /tmp/run_tests.$$ 2>&1 ||
        mail -s "TEST failure on $HOST: $TEST" $2 < /tmp/run_tests.$$
done


-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From erobererunc at gmail.com  Fri Feb  6 22:18:37 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:18:37 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
Message-ID: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>

Somebody much more intelligent than I said today that someone told him that
Python lists are just dictionaries with lists hashed by integers.  Since he
said that someone else told him this, I piped up and said that I thought
that wasn't true.  I looked at the source code for lists in python, and I
did not expressly remember seeing dictionaries.  Unfortunately I am not
somewhere where I can easily look at the code right now (I'm logged into
Windows!), and I might not realize exactly what I'm looking at anyways, but
I'd like to extend an apology to the guy soon if I was wrong.  So, can
anyone tell me if lists are really just dictionaries?  Thanks!
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From erobererunc at gmail.com  Fri Feb  6 22:24:08 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:24:08 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <775033410902061924l6997998dh617fa72c4852d098@mail.gmail.com>

Correction, the first sentence should read, "lists are just dictionaries
keyed with integers."

On Fri, Feb 6, 2009 at 10:18 PM, er <erobererunc at gmail.com> wrote:

> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!
>
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From clp2 at rebertia.com  Fri Feb  6 22:25:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 19:25:08 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!

They most certainly are not. This is Python, not Lua or PHP (where for
reasons I cannot fathom, they've seen fit to conflate dictionaries and
lists; although it does make slightly more sense in Lua's case)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bignose+hates-spam at benfinney.id.au  Fri Feb  6 22:29:30 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 07 Feb 2009 14:29:30 +1100
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <877i42x6ud.fsf@benfinney.id.au>

Jason Voegele <jason at jvoegele.com> writes:

> What's the recommended approach for Python programs? I'm sure I
> could write a shell script (or a Python script even) that scans my
> "test" directory for test cases and runs them, but I'm wondering if
> there's something already built in that could do this for me.

The lack of a built-in ?collect and run all the tests in this working
tree? in the Python unit test system is a known problem; discussions
are ongoing what to do about it.

Meanwhile, the third-party ?nose? system
<URL:http://somethingaboutorange.com/mrl/projects/nose/> provides this
and much more, while remaining compatible with both testing systems in
the standard library.

I generally set up a ?test? target in my Makefile, such that it will
use ?nosetests? to collect and run all the tests; then I just run
?make test? in a loop that is triggered by any filesystem change in my
project working tree.

-- 
 \        ?I have a microwave fireplace in my house. The other night I |
  `\   laid down in front of the fire for the evening in two minutes.? |
_o__)                                                   ?Steven Wright |
Ben Finney


From roy at panix.com  Fri Feb  6 22:32:20 2009
From: roy at panix.com (Roy Smith)
Date: Fri, 6 Feb 2009 19:32:20 -0800 (PST)
Subject: Portable way to refer to the null device?
Message-ID: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>

I need to run a command using subprocess.Popen() and have stdin
connected to the null device.  On unix, I would do:

        self.process = subprocess.Popen(argv,
                                        env=new_env,
                                        stdout=open(outfile, 'w'),
                                        stderr=open(errfile, 'w'),
                                        stdin=open('/dev/null')
                                        )

but that's not portable to windows.  Does Python have a portable way
to get a file object connected to the null device, regardless of what
operating system you're running on?



From erobererunc at gmail.com  Fri Feb  6 22:32:31 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:32:31 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
Message-ID: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>

Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
was actually part of the discussion that brought up this nugget.
Nevertheless, any details you care to provide about the details.  I'm going
to dive into the source code in more depth tomorrow, just so I can get a
better understanding anyway, but I'd love to hear some details, or see any
links, if you have them.

On Fri, Feb 6, 2009 at 10:25 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
> > Somebody much more intelligent than I said today that someone told him
> that
> > Python lists are just dictionaries with lists hashed by integers.  Since
> he
> > said that someone else told him this, I piped up and said that I thought
> > that wasn't true.  I looked at the source code for lists in python, and I
> > did not expressly remember seeing dictionaries.  Unfortunately I am not
> > somewhere where I can easily look at the code right now (I'm logged into
> > Windows!), and I might not realize exactly what I'm looking at anyways,
> but
> > I'd like to extend an apology to the guy soon if I was wrong.  So, can
> > anyone tell me if lists are really just dictionaries?  Thanks!
>
> They most certainly are not. This is Python, not Lua or PHP (where for
> reasons I cannot fathom, they've seen fit to conflate dictionaries and
> lists; although it does make slightly more sense in Lua's case)
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From clp2 at rebertia.com  Fri Feb  6 22:44:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 19:44:09 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
Message-ID: <50697b2c0902061944p16054f68r7bd9175e9fddbdf7@mail.gmail.com>

> On Fri, Feb 6, 2009 at 10:25 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
>> > Somebody much more intelligent than I said today that someone told him
>> > that
>> > Python lists are just dictionaries with lists hashed by integers.  Since
>> > he
>> > said that someone else told him this, I piped up and said that I thought
>> > that wasn't true.  I looked at the source code for lists in python, and
>> > I
>> > did not expressly remember seeing dictionaries.  Unfortunately I am not
>> > somewhere where I can easily look at the code right now (I'm logged into
>> > Windows!), and I might not realize exactly what I'm looking at anyways,
>> > but
>> > I'd like to extend an apology to the guy soon if I was wrong.  So, can
>> > anyone tell me if lists are really just dictionaries?  Thanks!
>>
>> They most certainly are not. This is Python, not Lua or PHP (where for
>> reasons I cannot fathom, they've seen fit to conflate dictionaries and
>> lists; although it does make slightly more sense in Lua's case)
>>
On Fri, Feb 6, 2009 at 7:32 PM, er <erobererunc at gmail.com> wrote:
> Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
> was actually part of the discussion that brought up this nugget.
> Nevertheless, any details you care to provide about the details.  I'm going
> to dive into the source code in more depth tomorrow, just so I can get a
> better understanding anyway, but I'd love to hear some details, or see any
> links, if you have them.

Unfortunately, I don't know the details as I'm not a CPython dev. I
only indirectly know that arrays are used from having read so
previously in writings talking about the implementation. Also, Python
generally tries to make its basic datatypes speedy, and using
dictionaries to implement lists would be completely counter to that
goal, no matter how excellent the dictionary implementation is.

In all likelihood, someone who /is/ familiar with the implementation
will probably chime in with the actual details.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From skip at pobox.com  Fri Feb  6 22:51:13 2009
From: skip at pobox.com (skip at pobox.com)
Date: Fri, 6 Feb 2009 21:51:13 -0600
Subject: Portable way to refer to the null device?
In-Reply-To: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <18829.1329.91043.255369@montanaro.dyndns.org>


    Roy> I need to run a command using subprocess.Popen() and have stdin
    Roy> connected to the null device. 

os.path.devnull should do what you want:

    >>> os.path.devnull
    '/dev/null'
    >>> import ntpath
    >>> ntpath.devnull
    'nul'

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From bignose+hates-spam at benfinney.id.au  Fri Feb  6 23:07:09 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 07 Feb 2009 15:07:09 +1100
Subject: Portable way to refer to the null device?
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <871vuax53m.fsf@benfinney.id.au>

Roy Smith <roy at panix.com> writes:

> I need to run a command using subprocess.Popen() and have stdin
> connected to the null device.  On unix, I would do:
> 
>         self.process = subprocess.Popen(argv,
>                                         env=new_env,
>                                         stdout=open(outfile, 'w'),
>                                         stderr=open(errfile, 'w'),
>                                         stdin=open('/dev/null')
>                                         )

Yikes, that's a nasty indentation you've got going on there. I'd be
writing the above as:

    self.process = subprocess.Popen(
        argv,
        env=new_env,
        stdout=open(outfile, 'w'),
        stderr=open(errfile, 'w'),
        stdin=open('/dev/null'),
        )

> but that's not portable to windows.  Does Python have a portable way
> to get a file object connected to the null device, regardless of what
> operating system you're running on?

Almost: the ?os.devnull? attribute is documented (in the documentation
for the ?os? module) as ?os.devnull is the file path of the null
device ('/dev/null', etc.)?.

So the above becomes:

    self.process = subprocess.Popen(
        argv,
        env=new_env,
        stdout=open(outfile, 'w'),
        stderr=open(errfile, 'w'),
        stdin=open(os.devnull),
        )

-- 
 \         ?Pinky, are you pondering what I'm pondering?? ?I think so, |
  `\         Brain, but how will we get a pair of Abe Vigoda's pants?? |
_o__)                                           ?_Pinky and The Brain_ |
Ben Finney


From vincent at vincentdavis.net  Fri Feb  6 23:16:02 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Fri, 6 Feb 2009 21:16:02 -0700
Subject: simple web app, where to start
Message-ID: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>

I have a simple script that takes a few input values and returns a csv file
and a few stats. If I wanted to host this on the web how would I. I have no
idea where to begin. If someone could point me in the right direction like
maybe a tutorial, tools I will need, functions..... I would appreciate it.I
know a little html but am not sure how to integrate python or know what
servers will handle it .....

Thanks
Vincent Davis
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From aioe.org at technicalbloke.com  Fri Feb  6 23:19:24 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Fri, 06 Feb 2009 23:19:24 -0500
Subject: Returning a variable number of things...
References: <gmi0og$4cl$1@aioe.org>
	<mailman.8999.1233946637.3487.python-list@python.org>
Message-ID: <gmj23t$vt2$1@aioe.org>

Chris Rebert wrote:
> On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:
>> Hi There,
>>
>> I have a function that uses *args to accept a variable number of
>> parameters and I would like it to return a variable number of objects.
>>
>> I could return a list but I would like to take advantage of tuple
>> unpacking with the return values e.g.
> 
> Despite its name, tuple unpacking works with lists too.
> 
> Cheers,
> Chris
> 

Ah so it does! Thanks Chris! I'm losing count of all the reasons I have
to love this language :-)


From clp2 at rebertia.com  Fri Feb  6 23:37:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 20:37:28 -0800
Subject: WebError documentation?
In-Reply-To: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
Message-ID: <50697b2c0902062037w572445f1t42ca2a29d8ec60f0@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> Is there any?  Where is it?  Extensive Googling has proven fruitless.

It's not a standard Python exception. A third-party library you're
using must be raising it. Check the exception traceback.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From michele.simionato at gmail.com  Fri Feb  6 23:40:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 6 Feb 2009 20:40:20 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
Message-ID: <9b81090e-4a29-4feb-bcf3-c5ba26c20188@o36g2000yqh.googlegroups.com>

On Feb 6, 10:23?pm, Rhamphoryncus <rha... at gmail.com> wrote:
> On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > >flatten generic iterables or only lists).
>
> > > Of course, once you do that, you need to special-case strings...
>
> > Strings are iterable but have no __iter__ method, which is fine in
> > this context, since I would say 99.9% of times one wants to treat them
> > as atomic objects, so no need to special case.
>
> Don't worry, that little oddity was fixed for you:

Acc! I have a few places in my code with checks of the
kind ``hasattr(x, '__iter__')`` and I guess those spots
will be tricky when converting to Python 3. I guess
2to3 cannot help either :-(


From apt.shansen at gmail.com  Fri Feb  6 23:47:52 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 20:47:52 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
Message-ID: <7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:32 PM, er <erobererunc at gmail.com> wrote:
> Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
> was actually part of the discussion that brought up this nugget.
> Nevertheless, any details you care to provide about the details.  I'm going
> to dive into the source code in more depth tomorrow, just so I can get a
> better understanding anyway, but I'd love to hear some details, or see any
> links, if you have them.

Yeah, as Chris said, Python lists are not dictionaries at all. They're
PyObjects that contain an array of pointers to other PyObjects. Basic
Python types try to be efficient and reliable. They're not always the
perfect choice, but they strive to be good enough for most situations
in terms of both functionality and speed... and while they have put a
lot of effort into tuning Python's hash implementation, an array has
to beat it hands down when you're implementing an ordered sequence.

Now, I believe Python sets *are* for all intents and purposes
dictionaries, but I think that's just because its the easiest and most
efficient way to implement their uniqueness properties; they took the
very-well-tuned dictionary implementation and cut out the stuff not
needed by sets and did some tweaks here or there. I /believe/.

--S


From exarkun at divmod.com  Sat Feb  7 00:15:20 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Sat, 7 Feb 2009 00:15:20 -0500
Subject: Running all unit tests
In-Reply-To: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <20090207051520.12853.2145202965.divmod.quotient.6828@henry.divmod.com>

On Fri, 06 Feb 2009 21:11:15 -0500, Jason Voegele <jason at jvoegele.com> wrote:
>I'm working on my first substantial Python project, and I'm following a fully
>test-first approach.  I'd like to know how Pythonistas typically go about
>running all of their tests to ensure that my application stays "green".
>
>In Ruby, I would have a Rake task so that I could say "rake test" and all
>tests would be executed.  In C or C++ I would have a make target so I could
>run all my tests with "make test".  In Java it would be an Ant task and "ant
>test".  And so forth and so on.
>
>What's the recommended approach for Python programs?  I'm sure I could write
>a shell script (or a Python script even) that scans my "test" directory for
>test cases and runs them, but I'm wondering if there's something already
>built in that could do this for me.

There are a bunch of tools for this.  I use trial (part of Twisted), which
will collect your tests, run them, and report the results (and has helpers
for debugging, profiling, and some other stuff) and buildbot.

Jean-Paul


From rdmurray at bitdance.com  Sat Feb  7 00:21:45 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 05:21:45 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
Message-ID: <gmj5p8$ggp$1@ger.gmane.org>

Quoth Mensanator <mensanator at aol.com>:
> On Feb 6, 3:23=A0pm, Rhamphoryncus <rha... at gmail.com> wrote:
> > On Feb 5, 1:16=A0pm, Michele Simionato <michele.simion... at gmail.com>
> > wrote:
> >
> > > On Feb 5, 7:24=A0pm, a... at pythoncraft.com (Aahz) wrote:
> > > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > > Michele Simionato =A0<michele.simion... at gmail.com> wrote:
> > > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > > >flatten generic iterables or only lists).
> > > > Of course, once you do that, you need to special-case strings...
> >
> > > Strings are iterable but have no __iter__ method, which is fine in
> > > this context, since I would say 99.9% of times one wants to treat them
> > > as atomic objects, so no need to special case.
> >
> > Don't worry, that little oddity was fixed for you:
> >
> >     Python 3.0+ (unknown, Dec =A08 2008, 14:26:15)
> >     [GCC 4.3.2] on linux2
> >     Type "help", "copyright", "credits" or "license" for more information.
> >     >>>  str.__iter__
> >     <slot wrapper '__iter__' of 'str' objects
> >     >>> bytes.__iter__
> >     <slot wrapper '__iter__' of 'bytes' objects
> >     >>> bytearray.__iter__
> >     <slot wrapper '__iter__' of 'bytearray' objects>
> >
> > I'm in the "why do you need more than 1 depth?" camp. Dispatching
> > based on your own type should be given an extra look. Dispatching
> > based passed in types should be given three extra looks.
> >
> > I didn't realize itertools.chain(*iterable) worked. I guess that
> > needs to be pushed as the canonical form.
> 
> What about this (from the Recipes section of the itertools manual)?
> 
> def flatten(listOfLists):
>     return list(chain.from_iterable(listOfLists))

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from itertools import chain
    >>> list(chain.from_iterable([1, 2, [3, 4]]))
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: 'int' object is not iterable
    >>> list(chain(*[1, 2, [3, 4]]))
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: 'int' object is not iterable
    >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
    ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]

--RDM



From ntwrkd at gmail.com  Sat Feb  7 00:41:30 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Fri, 6 Feb 2009 21:41:30 -0800
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <f257b9ab0902062141r2a0f8d64vd541d1f06cf9d5f2@mail.gmail.com>

have a loo at the django framework

http://www.djangoproject.com/

On Fri, Feb 6, 2009 at 8:16 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.
> I know a little html but am not sure how to integrate python or know what
> servers will handle it .....
> Thanks
> Vincent Davis
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From terry.yinzhe at gmail.com  Sat Feb  7 00:50:12 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Fri, 6 Feb 2009 21:50:12 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
Message-ID: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>

I used a CPD (copy/paste detector) in PMD to analyze the code
duplication in Python source code. I found that Python3.0 contains
more duplicated code than the previous versions. The CPD tool is far
from perfect, but I still feel the analysis makes some sense.

|Source Code      | NLOC     | Dup60   | Dup30   | Rate60    | Rate 30
|
Python1.5(Core)   19418       1072        3023      6%           16%
Python2.5(Core)   35797       1656        6441      5%           18%
Python3.0(Core)   40737       3460        9076      8%           22%
Apache(server)     18693       1114        2553      6%           14%

NLOC: The net lines of code
Dup60: Lines of code that has 60 continuous tokens duplicated to other
code (counted twice or more)
Dup30: 30 tokens duplicated
Rate60: Dup60/NLOC
Rate30: Dup30/NLOC

We can see that the common duplicated rate is tended to be stable. But
Python3.0 is slightly bigger than that. Consider the small increase in
NLOC, the duplication rate of Python3.0 might be too big.

Does that say something about the code quality of Python3.0?


From tjreedy at udel.edu  Sat Feb  7 02:31:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 07 Feb 2009 02:31:20 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <gmjdc8$tp4$1@ger.gmane.org>

er wrote:
> Somebody much more intelligent than I said today that someone told him 
> that Python lists are just dictionaries with lists hashed by integers.  

Abstractly, which is to say, behaviorally, a Python list is a sequence 
class as defined under Built-in Types in the Library manual. 
Dictionaries are a mapping class.  The two categories have different 
methods.  So at this level, the claim is nonsensical, wrong by 
definition.  A list *must* have it n entries indexed from 0 to n-1 and 
dicts do not and could not enforce such an invariant.

Concretely, an implementation could do as claimed under the covers, but 
CPython and I suspect all the other implementations actually use 
extensible arrays.  People *do* use dicts for sparse arrays, but then 
they are *not* sequences.

Good for you for asking here.

Terry Jan Reedy



From martin at v.loewis.de  Sat Feb  7 02:36:36 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 08:36:36 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
Message-ID: <498D3A04.60503@v.loewis.de>

> Does that say something about the code quality of Python3.0?

Not necessarily. IIUC, copying a single file with 2000 lines
completely could already account for that increase.

It would be interesting to see what specific files have gained
large numbers of additional files, compared to 2.5.

Regards,
Martin


From tjreedy at udel.edu  Sat Feb  7 02:37:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 07 Feb 2009 02:37:19 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1233850000.12935.4.camel@localhost.localdomain>
References: <gmf2e5$9b3$1@ger.gmane.org>
	<1233850000.12935.4.camel@localhost.localdomain>
Message-ID: <gmjdng$ua8$1@ger.gmane.org>

Albert Hopkins wrote:
> Probably that [c.l.]python is becoming more popular and, like most
> things as they become popular, it loses its "purity"... much like the
> Internet in the early 1990s.

Several years ago when I proposed the addition of list.pop(), a couple 
of people accused me of trying to ruin Python (by spoiling its 'purity', 
I guess).  There were some other unfriendly things said a few years 
later, by and to various people, in the discussion of integer division. 
  So I think python-list has become more friendly since.

Terry Jan Reedy



From rNOSPAMon at flownet.com  Sat Feb  7 03:06:08 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Sat, 07 Feb 2009 00:06:08 -0800
Subject: WebError documentation?
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
Message-ID: <rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>

In article <mailman.9037.1233981452.3487.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> > Is there any?  Where is it?  Extensive Googling has proven fruitless.
> 
> It's not a standard Python exception. A third-party library you're
> using must be raising it. Check the exception traceback.

I see I did not make myself clear.  I meant the Python software package 
called "weberror", not a generic web error.

http://pypi.python.org/pypi/WebError


rg


From jstroud at mbi.ucla.edu  Sat Feb  7 04:04:47 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sat, 07 Feb 2009 01:04:47 -0800
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8909.1233854801.3487.python-list@python.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8909.1233854801.3487.python-list@python.org>
Message-ID: <Q8cjl.17121$c45.14917@nlpi065.nbdc.sbc.com>

Tim Chase wrote:
> Is this where we tell you to shut up? <gdr> ;-)

Don't you mean STFU?



-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From rhamph at gmail.com  Sat Feb  7 04:06:06 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sat, 7 Feb 2009 01:06:06 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
Message-ID: <76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>

On Feb 6, 10:21?pm, rdmur... at bitdance.com wrote:
> Quoth Mensanator <mensana... at aol.com>:
> > def flatten(listOfLists):
> > ? ? return list(chain.from_iterable(listOfLists))
>
> ? ? Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> ? ? [GCC 4.3.2] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more information.
> ? ? >>> from itertools import chain
> ? ? >>> list(chain.from_iterable([1, 2, [3, 4]]))
> ? ? Traceback (most recent call last):
> ? ? ? File "<stdin>", line 1, in <module>
> ? ? TypeError: 'int' object is not iterable
> ? ? >>> list(chain(*[1, 2, [3, 4]]))
> ? ? Traceback (most recent call last):
> ? ? ? File "<stdin>", line 1, in <module>
> ? ? TypeError: 'int' object is not iterable
> ? ? >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> ? ? ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]

What usecase do you have for such inconsistently structured data?

If I'm building a tree I use my own type for the nodes, keeping them
purely internal, so I can always use isinstance without worrying about
getting something inconvenient passed in.


From dq at gmail.com  Sat Feb  7 04:36:14 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 10:36:14 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9023.1233973692.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>	<mailman.9017.1233966405.3487.python-list@python.org>	<gmipei$7s0$02$1@news.t-online.com>
	<mailman.9023.1233973692.3487.python-list@python.org>
Message-ID: <gmjkmg$q4b$02$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>> MRAB wrote:
>>> dq wrote:
>>>> dq wrote:
>>>>> MRAB wrote:
>>>>>> dq wrote:
>>>>>>> Martin v. L?wis wrote:
>>>>>>>>> So does anyone know what the deal is with this?  Why is the 
>>>>>>>>> same code so much slower on Windows?  Hope someone can tell me 
>>>>>>>>> before a holy war erupts :-)
>>>>>>>>
>>>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>>>  *nothing* to do with Python; Python calls the operating system 
>>>>>>>> functions to read from the network and write to the disk almost 
>>>>>>>> directly. So it must be the operating system itself that slows 
>>>>>>>> it down.
>>>>>>>>
>>>>>>>> To investigate further, you might drop the write operating,
>>>>>>>>  and measure only source.read(). If that is slower, then, for 
>>>>>>>> some reason, the network speed is bad on Windows. Maybe
>>>>>>>>  you have the network interfaces misconfigured? Maybe you are 
>>>>>>>> using wireless on Windows, but cable on Linux? Maybe you have 
>>>>>>>> some network filtering software running on Windows? Maybe it's 
>>>>>>>> just that Windows sucks?-)
>>>>>>>>
>>>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>>>  I ask the same questions. Perhaps you have some virus scanner 
>>>>>>>> installed that filters all write operations? Maybe
>>>>>>>>  Windows sucks?
>>>>>>>>
>>>>>>>> Regards, Martin
>>>>>>>>
>>>>>>>
>>>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>>>  the same fast server. I compared:
>>>>>>>
>>>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>>>> source.read() )"
>>>>>>>
>>>>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>>>>> everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>>>> not writing directly to the iPod.  This is kind of odd, because 
>>>>>>> if I copy the file over from the HD to the iPod using
>>>>>>>  windows (drag-n-drop), it takes about a second or two, so about 
>>>>>>> 10 MB/s.
>>>>>>>
>>>>>>> So the problem is definitely partially Windows, but it also seems 
>>>>>>> that Python's file.write() function is not without blame. It's 
>>>>>>> the combination of Windows, iPod and Python's data stream that is 
>>>>>>> slowing me down.
>>>>>>>
>>>>>>> I'm not really sure what I can do about this.  I'll experiment a 
>>>>>>> little more and see if there's any way around this bottleneck.  
>>>>>>> If anyone has run into a problem like this,
>>>>>>>  I'd love to hear about it...
>>>>>>>
>>>>>> You could try copying the file to the iPod using the command line, 
>>>>>> or copying data from disk to iPod in, say, C, anything but Python. 
>>>>>> This would allow you to identify whether Python itself has 
>>>>>> anything to do with it.
>>>>>
>>>>> Well, I think I've partially identified the problem. target.write( 
>>>>> source.read() ) runs perfectly fast, copies 20 megs
>>>>>  in about a second, from HD to iPod.  However, if I run the same
>>>>>  code in a while loop, using a certain block size, say 
>>>>> target.write( source.read(4096) ), it takes forever (or at least
>>>>>  I'm still timing it while I write this post).
>>>>>
>>>>> The mismatch seems to be between urllib2's block size and the write 
>>>>> speed of the iPod, I might try to tweak this a little in the code 
>>>>> and see if it has any effect.
>>>>>
>>>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want 
>>>>> to try to improve that...
>>>>
>>>> After some tweaking of the block size, I managed to get the DL speed 
>>>> up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>>>  a good order of magnitude better.  The new DL code is pretty much
>>>>  this:
>>>>
>>>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>>>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>>>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while 
>>>> DLd < fullsize: DLd = DLd + blocksize # optional:  write some DL 
>>>> progress info # somewhere, e.g. stdout target.close() source.close() 
>>>> """
>>>>
>>> I'd like to suggest that the block size you add to 'DLd' be the 
>>> actual size of the returned block, just in case the read() doesn't 
>>> return all you asked for (it might not be guaranteed, and the chances
>>>  are that the final block will be shorter, unless 'fullsize' happens
>>>  to be a multiple of 'blocksize').
>>>
>>> If less is returned by read() then the while-loop might finish before
>>>  all the data has been downloaded, and if you just add 'blocksize' 
>>> each time it might end up > 'fullsize', ie apparently >100% downloaded!
>>
>> Interesting.  I'll if to see if any of the downloaded files end 
>> prematurely :)
>>
>> btw, I forgot the most important line of the code!
>>
>> """
>> blocksize = 2 ** 16    # plus or minus a power of 2
>> source = urllib2.urlopen( 'url://string' )
>> target = open( pathname, 'wb')
>> fullsize = float( source.info()['Content-Length'] )
>> DLd = 0
>> while DLd < fullsize:
>>     #  +++
>>     target.write( source.read( blocksize ) )  # +++
>>     #  +++
>>     DLd = DLd + blocksize
>>     # optional:  write some DL progress info
>>     # somewhere, e.g. stdout
>> target.close()
>> source.close()
>> """
>>
>> Using that, I'm not quite sure where I can grab onto the value of how 
>> much was actually read from the block.  I suppose I could use an 
>> intermediate variable, read the data into it, measure the size, and 
>> then write it to the file stream, but I'm not sure it would be worth 
>> the overhead.  Or is there some other magic I should know about?
>>
>> If I start to get that problem, at least I'll know where to look...
>>
> It's just:
> 
>     data = source.read(blocksize)
>     target.write(data)
>     DLd = DLd + len(data)
> 
> The overhead is tiny because you're not copying the data.
> 
> If 'x' refers to a 1MB bytestring and you do "y = x" or "foo(x)", you're 
> not actually copying that bytestring; you're just making 'y' also refer 
> to it or passing the reference to it into 'foo'. It's a bit passing 
> pointers around, but without the nasty bits! :-)

Yeah, that's about what I was thinking, although not quite as 
succintly.  Thanks for the help!


From duncan.booth at invalid.invalid  Sat Feb  7 05:01:28 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 Feb 2009 10:01:28 GMT
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
	<mailman.8946.1233890231.3487.python-list@python.org>
	<8ac1c027-3bd4-43ae-99a9-012462cb06d7@r37g2000prr.googlegroups.com>
Message-ID: <Xns9BAB65FC53B37duncanbooth@127.0.0.1>

Andrew <andrew.replogle at gmail.com> wrote:

> As well as not using that and removing "endlocal" which
> I admit I have no clue what that does.

Python isn't the only system in the world to include a help command.

C:\>help endlocal
Ends localization of environment changes in a batch file.
Environment changes made after ENDLOCAL has been issued are
not local to the batch file; the previous settings are not
restored on termination of the batch file.

ENDLOCAL

If Command Extensions are enabled ENDLOCAL changes as follows:

If the corresponding SETLOCAL enable or disabled command extensions
using the new ENABLEEXTENSIONS or DISABLEEXTENSIONS options, then
after the ENDLOCAL, the enabled/disabled state of command extensions
will be restored to what it was prior to the matching SETLOCAL
command execution.


From terry.yinzhe at gmail.com  Sat Feb  7 05:51:07 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 02:51:07 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
Message-ID: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>

On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Does that say something about the code quality of Python3.0?
>
> Not necessarily. IIUC, copying a single file with 2000 lines
> completely could already account for that increase.
>
> It would be interesting to see what specific files have gained
> large numbers of additional files, compared to 2.5.
>
> Regards,
> Martin

But the duplication are always not very big, from about 100 lines
(rare) to less the 5 lines. As you can see the Rate30 is much bigger
than Rate60, that means there are a lot of small duplications.


From deets at nospam.web.de  Sat Feb  7 06:10:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 07 Feb 2009 12:10:17 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
Message-ID: <6v58gpFi7nnvU1@mid.uni-berlin.de>

Terry schrieb:
> On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
>>> Does that say something about the code quality of Python3.0?
>> Not necessarily. IIUC, copying a single file with 2000 lines
>> completely could already account for that increase.
>>
>> It would be interesting to see what specific files have gained
>> large numbers of additional files, compared to 2.5.
>>
>> Regards,
>> Martin
> 
> But the duplication are always not very big, from about 100 lines
> (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> than Rate60, that means there are a lot of small duplications.

Do you by any chance have a few examples of these? There is a lot of 
idiomatic code in python to e.g. acquire and release the GIL or doing 
refcount-stuff. If that happens to be done with rather generic names as 
arguments, I can well imagine that as being the cause.

Diez


From Laundro at gmail.com  Sat Feb  7 07:18:45 2009
From: Laundro at gmail.com (LaundroMat)
Date: Sat, 7 Feb 2009 04:18:45 -0800 (PST)
Subject: Trouble with regular expressions
Message-ID: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>

Hi,

I'm quite new to regular expressions, and I wonder if anyone here
could help me out.

I'm looking to split strings that ideally look like this: "Update: New
item (Household)" into a group.
This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
("Update", "New item", "(Household)")

Some strings will look like this however: "Update: New item (item)
(Household)". The expression above still does its job, as it returns
("Update", "New item (item)", "(Household)").

It does not work however when there is no text in parentheses (eg
"Update: new item"). How can I get the expression to return a tuple
such as ("Update:", "new item", None)?

Thanks in advance,

Mathieu


From jason at jvoegele.com  Sat Feb  7 07:54:23 2009
From: jason at jvoegele.com (Jason Voegele)
Date: Sat, 07 Feb 2009 07:54:23 -0500
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
	<877i42x6ud.fsf@benfinney.id.au>
Message-ID: <kYadnfIFEsziGRDUnZ2dnUVZ_ovinZ2d@insightbb.com>

Ben Finney wrote:
> Jason Voegele <jason at jvoegele.com> writes:
> 
>> What's the recommended approach for Python programs? I'm sure I
>> could write a shell script (or a Python script even) that scans my
>> "test" directory for test cases and runs them, but I'm wondering if
>> there's something already built in that could do this for me.
> 
> The lack of a built-in ???collect and run all the tests in this working
> tree??? in the Python unit test system is a known problem; discussions
> are ongoing what to do about it.
> 
> Meanwhile, the third-party ???nose??? system
> <URL:http://somethingaboutorange.com/mrl/projects/nose/> provides this
> and much more, while remaining compatible with both testing systems in
> the standard library.
> 
> I generally set up a ???test??? target in my Makefile, such that it will
> use ???nosetests??? to collect and run all the tests; then I just run
> ???make test??? in a loop that is triggered by any filesystem change in my
> project working tree.

Thanks to all for the helpful responses.  It's good to know I'm not the only 
one that has thought of this as a shortcoming.

-- 
Jason Voegele
Different all twisty a of in maze are you, passages little.




From gslindstrom at gmail.com  Sat Feb  7 07:56:22 2009
From: gslindstrom at gmail.com (gslindstrom)
Date: Sat, 7 Feb 2009 06:56:22 -0600
Subject: PyCon 2009 Tutorial Days
Message-ID: <a9f39a410902070456r75d0c794md32b1de47869c5ba@mail.gmail.com>

Registration for PyCon 2009 <http://us.pycon.org/2009/registration/> (US) is
open.  Because of the popularity of the tutorials in years past, this year
features 2 days of tutorials <http://us.pycon.org/2009/tutorials> (32 total
class on Wednesday, March 25 and Thursday, March 26) including:

   - 2 tracks on Introduciton to Python
   - Working with Excel
spreadsheets<http://us.pycon.org/2009/tutorials/schedule/1AM8/>
   - GIS with Python <http://us.pycon.org/2009/tutorials/schedule/1PM4/>
   - Django <http://us.pycon.org/2009/tutorials/schedule/1PM2/>
   - Concurrency <http://us.pycon.org/2009/tutorials/schedule/1PM6/> and
   Kamaelia <http://us.pycon.org/2009/tutorials/schedule/1AM7/>
   - Testing <http://us.pycon.org/2009/tutorials/schedule/2AM2/>
   - SQLAlchemy <http://us.pycon.org/2009/tutorials/schedule/2AM4/>
   - Advanced topics
   <http://us.pycon.org/2009/tutorials/schedule/>
   - much, much more <http://us.pycon.org/2009/tutorials/schedule/>

These classes are being presented by some of the smartest cookies in the
Python community and are 3-hours each (with break).  You get to rub
shoulders with other Python programmers who share your interests and all
sessions have time for you to ask questions.  There is a (modest) cost to
attend, but you will get great training as well as class notes.  We even
feed you lunch and provide snacks during the breaks.

Click http://us.pycon.org/2009/about/ for more information.  Questions?
Email us at pycon-tutorials at python.org.

Greg Lindstrom
Tutorial Coordinator
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From terry.yinzhe at gmail.com  Sat Feb  7 08:36:07 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:36:07 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <5ae6f965-f983-47da-a9e7-ed47397f1317@i18g2000prf.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example 1:
Found a 64 line (153 tokens) duplication in the following files:
Starting at line 73 of D:\DOWNLOADS\Python-3.0\Python\thread_pth.h
Starting at line 222 of D:\DOWNLOADS\Python-3.0\Python
\thread_pthread.h

	return (long) threadid;
#else
	return (long) *(long *) &threadid;
#endif
}

static void
do_PyThread_exit_thread(int no_cleanup)
{
	dprintf(("PyThread_exit_thread called\n"));
	if (!initialized) {
		if (no_cleanup)
			_exit(0);
		else
			exit(0);
	}
}

void
PyThread_exit_thread(void)
{
	do_PyThread_exit_thread(0);
}

void
PyThread__exit_thread(void)
{
	do_PyThread_exit_thread(1);
}

#ifndef NO_EXIT_PROG
static void
do_PyThread_exit_prog(int status, int no_cleanup)
{
	dprintf(("PyThread_exit_prog(%d) called\n", status));
	if (!initialized)
		if (no_cleanup)
			_exit(status);
		else
			exit(status);
}

void
PyThread_exit_prog(int status)
{
	do_PyThread_exit_prog(status, 0);
}

void
PyThread__exit_prog(int status)
{
	do_PyThread_exit_prog(status, 1);
}
#endif /* NO_EXIT_PROG */

#ifdef USE_SEMAPHORES

/*
 * Lock support.
 */

PyThread_type_lock
PyThread_allocate_lock(void)
{



From terry.yinzhe at gmail.com  Sat Feb  7 08:36:36 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:36:36 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example 2:
Found a 16 line (106 tokens) duplication in the following files:
Starting at line 4970 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5015 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5073 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

                                PyErr_Format(PyExc_TypeError,
"GeneratorExp field \"generators\" must be a list, not a %.200s", tmp-
>ob_type->tp_name);
                                goto failed;
                        }
                        len = PyList_GET_SIZE(tmp);
                        generators = asdl_seq_new(len, arena);
                        if (generators == NULL) goto failed;
                        for (i = 0; i < len; i++) {
                                comprehension_ty value;
                                res = obj2ast_comprehension
(PyList_GET_ITEM(tmp, i), &value, arena);
                                if (res != 0) goto failed;
                                asdl_seq_SET(generators, i, value);
                        }
                        Py_XDECREF(tmp);
                        tmp = NULL;
                } else {
                        PyErr_SetString(PyExc_TypeError, "required
field \"generators\" missing from GeneratorExp");



From terry.yinzhe at gmail.com  Sat Feb  7 08:38:02 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:38:02 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <3ff230fd-65fc-4e6a-b943-d290a021b8f2@w24g2000prd.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example of a small one (61 token duplicated):
Found a 19 line (61 tokens) duplication in the following files:
Starting at line 132 of D:\DOWNLOADS\Python-3.0\Python\modsupport.c
Starting at line 179 of D:\DOWNLOADS\Python-3.0\Python\modsupport.c

		PyTuple_SET_ITEM(v, i, w);
	}
	if (itemfailed) {
		/* do_mkvalue() should have already set an error */
		Py_DECREF(v);
		return NULL;
	}
	if (**p_format != endchar) {
		Py_DECREF(v);
		PyErr_SetString(PyExc_SystemError,
				"Unmatched paren in format");
		return NULL;
	}
	if (endchar)
		++*p_format;
	return v;
}

static PyObject *



From terry.yinzhe at gmail.com  Sat Feb  7 08:39:42 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:39:42 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <65261947-714a-46d6-8769-2a32bf56caa1@p23g2000prp.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example of a even small one (30 token duplicated):
Found a 11 line (30 tokens) duplication in the following files:
Starting at line 2551 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 3173 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

        if (PyObject_SetAttrString(result, "ifs", value) == -1)
                goto failed;
        Py_DECREF(value);
        return result;
failed:
        Py_XDECREF(value);
        Py_XDECREF(result);
        return NULL;
}

PyObject*



From terry.yinzhe at gmail.com  Sat Feb  7 08:42:00 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:42:00 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

And I'm not saying that you can not have duplication in code. But it
seems that the stable & successful software releases tend to have
relatively stable duplication rate.


From cosmo_general at yahoo.com  Sat Feb  7 08:47:27 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Sat, 7 Feb 2009 05:47:27 -0800 (PST)
Subject: urllib2: problem of handling space in parameter
Message-ID: <3afe6c35-7610-47ea-8165-115e41a11763@13g2000yql.googlegroups.com>

Hi Folks,

I encrountered a problem of using urllib2: the space handling. Look at
the code below:

import urllib2
url = r'http://somedomain.com/a.cgi?name=muddy coder&password=foobar
cgi_back = urllib2.urlopen(url).read()

In this cgi_back, I saw field password worked fine, but field name
not, only muddy was picked up by CGI. So, I had to cover the space, by
using syntax name=muddy-coder, it went through. So, I presume urllib2
may have an approach of handling white space in this regard. Can
anybody help? Thanks!

Muddy Coder


From aquagnu at gmail.com  Sat Feb  7 08:50:18 2009
From: aquagnu at gmail.com (Yosifov Pavel)
Date: Sat, 7 Feb 2009 05:50:18 -0800 (PST)
Subject: typedef (type alias) and ctypes
Message-ID: <99a964c1-85a0-4139-93a3-e8bce614cccb@o11g2000yql.googlegroups.com>

I try to create type aliases, like typedef in C (a specially aliases
to ctypes objects). This case:

>>> some_type = c_ulong
>>> oth_type = c_ulong

works in all cases but not with type qualification:

>>> t1 = c_ulong # reference to c_ulong, nothing else :(
>>> t2 = c_ulong
>>> x = t1()
>>> y = t2()
>>> type(x)==type(y)
True

This trivial way for typedef doesn't allow to determine real type and
it's absolutely right :)

>>> t1 = type('t1',(c_ulong,),{})
>>> t2 = type('t2',(c_ulong,),{})
>>> x = t1()
>>> y = t2()
>>> type(x)==type(y)
False

The problem:
1st way work in complex using of ctypes (interfacing with some DLLs),
but doesn't allow to determine real type!
2st way allows to determine real type, but "access violation reading
0x0000000C'" occurs in some DLL calls!

Question: what "warts", errors are in 2nd way (may be reason of access
violation)?

--
Pavel


From rdmurray at bitdance.com  Sat Feb  7 09:16:42 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 14:16:42 +0000 (UTC)
Subject: urllib2: problem of handling space in parameter
References: <3afe6c35-7610-47ea-8165-115e41a11763@13g2000yql.googlegroups.com>
Message-ID: <gmk54a$ka1$1@ger.gmane.org>

Quoth Muddy Coder <cosmo_general at yahoo.com>:
> Hi Folks,
> 
> I encrountered a problem of using urllib2: the space handling. Look at
> the code below:
> 
> import urllib2
> url = r'http://somedomain.com/a.cgi?name=muddy coder&password=foobar
> cgi_back = urllib2.urlopen(url).read()
> 
> In this cgi_back, I saw field password worked fine, but field name
> not, only muddy was picked up by CGI. So, I had to cover the space, by
> using syntax name=muddy-coder, it went through. So, I presume urllib2
> may have an approach of handling white space in this regard. Can
> anybody help? Thanks!

urllib.urlencode.  Unecoded spaces aren't actually valid in a URL.

--David



From sjmachin at lexicon.net  Sat Feb  7 09:18:07 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 06:18:07 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
Message-ID: <65540e37-69a0-4664-a258-a5b0543c0ecd@s9g2000prg.googlegroups.com>

On Feb 7, 11:18?pm, LaundroMat <Laun... at gmail.com> wrote:
> Hi,
>
> I'm quite new to regular expressions, and I wonder if anyone here
> could help me out.
>
> I'm looking to split strings that ideally look like this: "Update: New
> item (Household)" into a group.
> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> ("Update", "New item", "(Household)")
>
> Some strings will look like this however: "Update: New item (item)
> (Household)". The expression above still does its job, as it returns
> ("Update", "New item (item)", "(Household)").
>
> It does not work however when there is no text in parentheses (eg
> "Update: new item"). How can I get the expression to return a tuple
> such as ("Update:", "new item", None)?

I don't see how it can be done without some post-matching adjustment.
Try this:

C:\junk>type mathieu.py
import re

tests = [
    "Update: New item (Household)",
    "Update: New item (item) (Household)",
    "Update: new item",
    "minimal",
    "parenthesis (plague) (has) (struck)",
    ]

regex = re.compile("""
    (Update:)?      # optional prefix
    \s*             # ignore whitespace
    ([^()]*)        # any non-parentheses stuff
    (\([^()]*\))?   # optional (blahblah)
    \s*            # ignore whitespace
    (\([^()]*\))?   # another optional (blahblah)
    $
    """, re.VERBOSE)

for i, test in enumerate(tests):
    print "Test #%d: %r" % (i, test)
    m = regex.match(test)
    if not m:
        print "No match"
    else:
        g = m.groups()
        print g
        if g[3] is not None:
            x = (g[0], g[1] + g[2], g[3])
        else:
            x = g[:3]
        print x
        print

C:\junk>mathieu.py
Test #0: 'Update: New item (Household)'
('Update:', 'New item ', '(Household)', None)
('Update:', 'New item ', '(Household)')

Test #1: 'Update: New item (item) (Household)'
('Update:', 'New item ', '(item)', '(Household)')
('Update:', 'New item (item)', '(Household)')

Test #2: 'Update: new item'
('Update:', 'new item', None, None)
('Update:', 'new item', None)

Test #3: 'minimal'
(None, 'minimal', None, None)
(None, 'minimal', None)

Test #4: 'parenthesis (plague) (has) (struck)'
No match

HTH,
John


From geekmail at usenot.de  Sat Feb  7 09:21:22 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:21:22 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
Message-ID: <20090207152122.683de28e@usenot.de>

I've found something in the spirit of the following (in the epydoc
sources, if you care):

if True:
    print "outer if"
    for t in range(2):
        if True:
            print "for if"
    else:
        print "phantom else"

For the life of me I can't place the "else". Which if clause does it
belong to? None, it would seem from running the above snippet:

outer if
For if
For if
Phantom else

It seems that there is a for...else construct. Replacing the inner if
with pass seems to confirm this. The else clause is still executed.

What's broken here: Python or my brain?

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From rdmurray at bitdance.com  Sat Feb  7 09:25:02 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 14:25:02 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
Message-ID: <gmk5jt$lgt$1@ger.gmane.org>

Rhamphoryncus <rhamph at gmail.com> wrote:
> On Feb 6, 10:21=A0pm, rdmur... at bitdance.com wrote:
> > Quoth Mensanator <mensana... at aol.com>:
> > > def flatten(listOfLists):
> > > =A0 =A0 return list(chain.from_iterable(listOfLists))
> >
> > =A0 =A0 Python 2.6.1 (r261:67515, Jan =A07 2009, 17:09:13)
> > =A0 =A0 [GCC 4.3.2] on linux2
> > =A0 =A0 Type "help", "copyright", "credits" or "license" for more informa=
> tion.
> > =A0 =A0 >>> from itertools import chain
> > =A0 =A0 >>> list(chain.from_iterable([1, 2, [3, 4]]))
> > =A0 =A0 Traceback (most recent call last):
> > =A0 =A0 =A0 File "<stdin>", line 1, in <module>
> > =A0 =A0 TypeError: 'int' object is not iterable
> > =A0 =A0 >>> list(chain(*[1, 2, [3, 4]]))
> > =A0 =A0 Traceback (most recent call last):
> > =A0 =A0 =A0 File "<stdin>", line 1, in <module>
> > =A0 =A0 TypeError: 'int' object is not iterable
> > =A0 =A0 >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> > =A0 =A0 ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]
> 
> What usecase do you have for such inconsistently structured data?
> 
> If I'm building a tree I use my own type for the nodes, keeping them
> purely internal, so I can always use isinstance without worrying about
> getting something inconvenient passed in.

I don't have any use cases myself, I'm just pointing out that this
doesn't answer the concerns of the OP, who presumably does.

--RDM



From mdemenko at gmail.com  Sat Feb  7 09:27:24 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Sat, 07 Feb 2009 15:27:24 +0100
Subject: py2exe and distutils
Message-ID: <gmk5o8$g34$00$1@news.t-online.com>

Hi,
i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
Now i can't list installed modules, here is the stacktrace:



help> modules

Please wait a moment while I gather a list of all available modules...

Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Programme\Python25\lib\site.py", line 346, in __call__
     return pydoc.help(*args, **kwds)
   File "C:\Programme\Python25\lib\pydoc.py", line 1649, in __call__
     self.interact()
   File "C:\Programme\Python25\lib\pydoc.py", line 1667, in interact
     self.help(request)
   File "C:\Programme\Python25\lib\pydoc.py", line 1683, in help
     elif request == 'modules': self.listmodules()
   File "C:\Programme\Python25\lib\pydoc.py", line 1804, in listmodules
     ModuleScanner().run(callback)
   File "C:\Programme\Python25\lib\pydoc.py", line 1855, in run
     for importer, modname, ispkg in pkgutil.walk_packages():
   File "C:\Programme\Python25\lib\pkgutil.py", line 110, in walk_packages
     __import__(name)
   File 
"C:\Programme\Python25\Lib\site-packages\setuptools\__init__.py", line 
2, in <module>
     from setuptools.extension import Extension, Library
   File 
"C:\Programme\Python25\Lib\site-packages\setuptools\extension.py", line 
2, in <module>
     from dist import _get_unpatched
   File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
line 27, in <module>
     _Distribution = _get_unpatched(_Distribution)
   File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
line 23, in _get_unpatched
     "distutils has already been patched by %r" % cls
AssertionError: distutils has already been patched by <class 
py2exe.Distribution at 0x011B4F90>

Any suggestion, how to fix this issue?

Best regards

Maxim


From geekmail at usenot.de  Sat Feb  7 09:27:53 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:27:53 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <20090207152753.6526a574@usenot.de>

On Sat, 7 Feb 2009 15:21:22 +0100 Andreas Waldenburger
<geekmail at usenot.de> wrote:

> outer if
> For if
> For if
> Phantom else
> 
Geez, I'm a moron. This is obviously not the output from the snippet.
But if you fix the capitalization, it is. Sorry for that.

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From steve at pearwood.info  Sat Feb  7 09:28:00 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 08 Feb 2009 01:28:00 +1100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <019d9052$0$20640$c3e8da3@news.astraweb.com>

Andreas Waldenburger wrote:

> It seems that there is a for...else construct. Replacing the inner if
> with pass seems to confirm this. The else clause is still executed.

Yes, there is a for...else construct.

The else block runs if the for loop exits *without* a break.

for i in range(20):
    if i == 10: break
else:
    print "no break here"

for i in range(20):
    if i == 100: break
else:
    print "no break here"


> What's broken here: Python or my brain?

Perhaps we should not answer that question.


-- 
Steven



From __peter__ at web.de  Sat Feb  7 09:32:54 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 07 Feb 2009 15:32:54 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <gmk62j$dje$03$1@news.t-online.com>

Andreas Waldenburger wrote:

> I've found something in the spirit of the following (in the epydoc
> sources, if you care):
> 
> if True:
>     print "outer if"
>     for t in range(2):
>         if True:
>             print "for if"
>     else:
>         print "phantom else"
> 
> For the life of me I can't place the "else". Which if clause does it
> belong to? None, it would seem from running the above snippet:
> 
> outer if
> For if
> For if
> Phantom else
> 
> It seems that there is a for...else construct. Replacing the inner if
> with pass seems to confirm this. The else clause is still executed.
> 
> What's broken here: Python or my brain?

Your rtfm sensor?

http://docs.python.org/reference/compound_stmts.html#the-for-statement

In short, the else suite is executed unless the for-loop is left
via 'break':

>>> for i in [1]:
...     break
... else:
...     print "else"
...
>>> for i in [1]:
...     pass
... else:
...     print "else"
...
else
>>>

Peter


From geekmail at usenot.de  Sat Feb  7 09:34:59 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:34:59 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
Message-ID: <20090207153459.123c5706@usenot.de>

On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
<steve at pearwood.info> wrote:

> Andreas Waldenburger wrote:
> 
> > It seems that there is a for...else construct. Replacing the inner
> > if with pass seems to confirm this. The else clause is still
> > executed.
> 
> Yes, there is a for...else construct.
> 
That's something. In 6+ years of Python programming I've never seen or
heard of this thing. This might be useful, apparently.


> [snip]
> 
> > What's broken here: Python or my brain?
> 
> Perhaps we should not answer that question.
> 
I did phrase that rather provocatively, didn't I?

Well thanks. I'll try to learn less noisily in the future. :)

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From google at mrabarnett.plus.com  Sat Feb  7 09:37:31 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 14:37:31 +0000
Subject: Trouble with regular expressions
In-Reply-To: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
Message-ID: <498D9CAB.9090900@mrabarnett.plus.com>

LaundroMat wrote:
> Hi,
> 
> I'm quite new to regular expressions, and I wonder if anyone here
> could help me out.
> 
> I'm looking to split strings that ideally look like this: "Update: New
> item (Household)" into a group.
> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> ("Update", "New item", "(Household)")
> 
> Some strings will look like this however: "Update: New item (item)
> (Household)". The expression above still does its job, as it returns
> ("Update", "New item (item)", "(Household)").
> 
> It does not work however when there is no text in parentheses (eg
> "Update: new item"). How can I get the expression to return a tuple
> such as ("Update:", "new item", None)?
> 
You need to make the last group optional and also make the middle group 
lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.

(?:...) is the non-capturing version of (...).

If you don't make the middle group lazy then it'll capture the rest of 
the string and the last group would never match anything!


From andrew at acooke.org  Sat Feb  7 09:42:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 7 Feb 2009 11:42:05 -0300 (CLST)
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <019d9052$0$20640$c3e8da3@news.astraweb.com>
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
Message-ID: <e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>


there's a justification for this awful mess here -
http://mail.python.org/pipermail/python-3000/2006-March/000104.html

i didn't know about this, and even after reading steven's broken (i
assume) example, managed to get it backwards.

the else is if there *isn't* a break and is for search loops (see link
above).

(it's still in 3).

andrew


Steven D'Aprano wrote:
> Andreas Waldenburger wrote:
>
>> It seems that there is a for...else construct. Replacing the inner if
>> with pass seems to confirm this. The else clause is still executed.
>
> Yes, there is a for...else construct.
>
> The else block runs if the for loop exits *without* a break.
>
> for i in range(20):
>     if i == 10: break
> else:
>     print "no break here"
>
> for i in range(20):
>     if i == 100: break
> else:
>     print "no break here"
>
>
>> What's broken here: Python or my brain?
>
> Perhaps we should not answer that question.
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From google at mrabarnett.plus.com  Sat Feb  7 09:44:25 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 14:44:25 +0000
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <20090207153459.123c5706@usenot.de>
References: <20090207152122.683de28e@usenot.de>	<019d9052$0$20640$c3e8da3@news.astraweb.com>
	<20090207153459.123c5706@usenot.de>
Message-ID: <498D9E49.6070001@mrabarnett.plus.com>

Andreas Waldenburger wrote:
> On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
> <steve at pearwood.info> wrote:
> 
>> Andreas Waldenburger wrote:
>>
>>> It seems that there is a for...else construct. Replacing the inner
>>> if with pass seems to confirm this. The else clause is still
>>> executed.
>> Yes, there is a for...else construct.
>>
> That's something. In 6+ years of Python programming I've never seen or
> heard of this thing. This might be useful, apparently.
> 
One use case is:

for x in list_of_items:
     if x.value == desired_value:
         desired_name = x.name
         break
else:
    print "Couldn't find %s" % x.value

> 
>> [snip]
>>
>>> What's broken here: Python or my brain?
>> Perhaps we should not answer that question.
>>
> I did phrase that rather provocatively, didn't I?
> 
> Well thanks. I'll try to learn less noisily in the future. :)
> 



From REMpeteOVE at CAPpetezilla.ITALSco.uk  Sat Feb  7 09:46:17 2009
From: REMpeteOVE at CAPpetezilla.ITALSco.uk (Peter Chant)
Date: Sat, 07 Feb 2009 14:46:17 +0000
Subject: Newbie SWMixer / numpy help - AssertionError
Message-ID: <pej066x0mc.ln2@phoenix.fire>

Hello,

I'm a bit of a python newby.  I want to play and record sound
simultaneously.  SWMixer seems able to do this but the examples use WAV
files.  I'm trying to play a test tone.  Can anyone give me a steer as to
why this fails?

import sys
import swmixer
import numpy


swmixer.init(samplerate=44100, chunksize=1024, stereo=False,
microphone=True)
#snd = swmixer.Sound("test1.wav")
time = 1
freq = 440
time = numpy.linspace(0,1,44100*time)       # 44100 numbers between 0 and 1
tone_data = numpy.sin(time*2*numpy.pi*freq) # A above Middle C
snd = swmixer.Sound(tone_data)

snd.play(loops=-1)

I know this may be in a little at the deep end for someone who has just
started to learn python, but I find I learn a lot faster if I try to do
something that is useful.

Pete


-- 
http://www.petezilla.co.uk


From mail at joaomoreno.com  Sat Feb  7 09:55:06 2009
From: mail at joaomoreno.com (mail at joaomoreno.com)
Date: Sat, 7 Feb 2009 06:55:06 -0800 (PST)
Subject: BaseHTTPRequestHandler freezes while writing to self.wfile after 
	installing Python 3.0
Message-ID: <ffdee1a1-109a-4bfa-a1ec-5717cfbcaf44@u14g2000yqg.googlegroups.com>

Hey guys,

I'm starting to lose my head with this one.

I have a class that extends BaseHTTPRequestHandler. It works fine on
Python 2.5. And yesterday I was curious and decided to install Python
3.0 on my Mac (I followed this tutorial, to be sure I wasn't messing
things up: http://farmdev.com/thoughts/66/python-3-0-on-mac-os-x-alongside-2-6-2-5-etc-/
). I tried my application on Python 3.0 and the code just freezed on
this line:

self.wfile.write(f.read())

I searched and got to this bug http://bugs.python.org/issue3826 . I
couldn't understand if there's already a fix for that. But, the
strangest thing was that, when I tried my application on 2.5, it
started freezing on the same spot! I then removed everything I
installed from 3.0, fixed the paths, and it still gives me the error.
I don't know what else to do.

The app works fine on 2.5, because I tried it on another computer.

Thanks for your help.


From floatingpeanut at gmail.com  Sat Feb  7 10:00:55 2009
From: floatingpeanut at gmail.com (floatingpeanut)
Date: Sat, 7 Feb 2009 07:00:55 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<1233850000.12935.4.camel@localhost.localdomain> 
	<mailman.9043.1233992252.3487.python-list@python.org>
Message-ID: <d6c6cb2f-322a-4cda-ac1d-d988f34af779@s20g2000yqh.googlegroups.com>

On Feb 7, 2:37?am, Terry Reedy <tjre... at udel.edu> wrote:
> ? So I think python-list has become more friendly since.

I've experienced the same sort of thing. About a year ago (I think)
there were one or more regulars here who were often somewhat rude,
unfriendly, or snobbish (not naming any names). Trouble was, they were
experienced and often helpful too so the behaviour was mostly
tolerated.

Haven't seen that sort of thing in a while though. c.l.py is a very
friendly place these days.


From deets at nospam.web.de  Sat Feb  7 10:45:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 07 Feb 2009 16:45:28 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <gmk62j$dje$03$1@news.t-online.com>
References: <20090207152122.683de28e@usenot.de>
	<gmk62j$dje$03$1@news.t-online.com>
Message-ID: <6v5okoFi8vgdU2@mid.uni-berlin.de>

Peter Otten schrieb:
> Andreas Waldenburger wrote:
> 
>> I've found something in the spirit of the following (in the epydoc
>> sources, if you care):
>>
>> if True:
>>     print "outer if"
>>     for t in range(2):
>>         if True:
>>             print "for if"
>>     else:
>>         print "phantom else"
>>
>> For the life of me I can't place the "else". Which if clause does it
>> belong to? None, it would seem from running the above snippet:
>>
>> outer if
>> For if
>> For if
>> Phantom else
>>
>> It seems that there is a for...else construct. Replacing the inner if
>> with pass seems to confirm this. The else clause is still executed.
>>
>> What's broken here: Python or my brain?
> 
> Your rtfm sensor?
> 
> http://docs.python.org/reference/compound_stmts.html#the-for-statement
> 
> In short, the else suite is executed unless the for-loop is left
> via 'break':

Or exceptions of course. Might be obvious, but for completeness' sake.

Diez


From dave.nuttall at blueyonder.co.uk  Sat Feb  7 10:52:53 2009
From: dave.nuttall at blueyonder.co.uk (David Nuttall)
Date: Sat, 7 Feb 2009 15:52:53 -0000
Subject: Beginner Python OpenGL difficulties
Message-ID: <20090207163720.4FD351E4002@bag.python.org>

Hi Mike,

            I am just getting into OPENGL from Python. But I am having
problems. Each time I try to run some OPENGL code I get the following sort
of error:

 

Traceback (most recent call last):

  File "C:\Documents and Settings\Owner\My Documents\My Work\Python
Modules\PyOpenGL-Demo-3.0.0b6\PyOpenGL-Demo\NeHe\lesson1.py", line 142, in
<module>

    main()

  File "C:\Documents and Settings\Owner\My Documents\My Work\Python
Modules\PyOpenGL-Demo-3.0.0b6\PyOpenGL-Demo\NeHe\lesson1.py", line 97, in
main

    glutInit(sys.argv)

  File "C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py", line 316, in
glutInit

    _base_glutInit( ctypes.byref(count), holder )

  File "C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py", line 57, in
_base_glutInit

    return __glutInitWithExit(pargc, argv, _exitfunc)

  File "C:\Python25\Lib\site-packages\OpenGL\platform\baseplatform.py", line
280, in __call__

    self.__name__, self.__name__,

NullFunctionError: Attempt to call an undefined function __glutInitWithExit,
check for bool(__glutInitWithExit) before calling

 

I can only think that the installation might be wrong. I have an AMD machine
running Win32 - XP.

 

Hope you can help me?

 

Best regards

 

Dave

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From notvalid2 at sbcglobal.net  Sat Feb  7 11:10:43 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Sat, 07 Feb 2009 08:10:43 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8992.1233938703.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
	<mailman.8992.1233938703.3487.python-list@python.org>
Message-ID: <Jnijl.16292$yr3.5511@nlpi068.nbdc.sbc.com>

MRAB wrote:
> W. eWatson wrote:
...
>> I thought some months ago, I found Google commands that would operate 
>> in the browser link window. Guess not.
>>
>> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where 
>> else does one find out about these Google tools?
>>
> Google? :-)
> 
> http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861
> 
Thanks. I may have that book marked from many, many months ago. If so, I see 
why I'd never find it. The BM entry does not show "Google". It does now. ;-)

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From benjamin at python.org  Sat Feb  7 11:20:08 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 7 Feb 2009 16:20:08 +0000 (UTC)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
Message-ID: <loom.20090207T161853-979@post.gmane.org>

Terry <terry.yinzhe <at> gmail.com> writes:
> On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > Do you by any chance have a few examples of these? There is a lot of
> > idiomatic code in python to e.g. acquire and release the GIL or doing
> > refcount-stuff. If that happens to be done with rather generic names as
> > arguments, I can well imagine that as being the cause.

> Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

This isn't really fair because Python-ast.c is auto generated. ;)






From zaheer.agadi at gmail.com  Sat Feb  7 11:24:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 7 Feb 2009 08:24:41 -0800 (PST)
Subject: Java to Python
Message-ID: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>

Hi

I have a following class that is written Java and makes use of apache
http client library,I am new to python can any one suggest me a python
equivalent of this following class,

Thanks ,

public class Authenticate{

 private String storageUserName=null;
    private String storagePassword=null;
    private String authorization=null;
    private String identityHostName = null;
    private String identityPortNumber = null;

    private String accessKey=null;
    private String secretKey=null;

    public String getStoragePassword() {
        return storagePassword;
    }

    public void setStoragePassword(String storagePassword) {
        this.storagePassword = storagePassword;
    }

    public String getStorageUserName() {
        return storageUserName;
    }

    public void setStorageUserName(String storageUserName) {
        this.storageUserName = storageUserName;
    }

    public String getIdentityHostName() {
        return identityHostName;
    }

    public void setIdentityHostName(String identityHostName) {
        this.identityHostName = identityHostName;
    }

    public String getIdentityPortNumber() {
        return identityPortNumber;
    }

    public void setIdentityPortNumber(String identityPortNumber) {
        this.identityPortNumber = identityPortNumber;
    }

    public String getAccessKey() {
        return accessKey;
    }

    public void setAccessKey(String accessKey) {
        this.accessKey = accessKey;
    }

    public String getSecretKey() {
        return secretKey;
    }

    public void setSecretKey(String secretKey) {
        this.secretKey = secretKey;
    }


     /**
     * <p>Convenience string for Base 64 encoding.</p>
     */
    private static final String BASE64_CHARS =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
            "abcdefghijklmnopqrstuvwxyz" +
            "0123456789+/";

    /**
     * <p>Encode the specified credentials into a String as required
by
     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
rfc2617.txt">RFC 2617</a>).</p>
     *
     * @param username Username to be encoded
     * @param password Password to be encoded
     * @return String string containing encoded username and password.
     */
    public String encodeCredentialsBasic(String username, String
password) {
        String encode = username + ":" + password;
        int paddingCount = (3 - (encode.length() % 3)) % 3;
        encode += "\0\0".substring(0, paddingCount);
        StringBuilder encoded = new StringBuilder();

        for (int i = 0; i < encode.length(); i += 3) {
        }
        return encoded.toString();
    }

    public void fetchDetails(){
        HttpClient client=new HttpClient();
        //reqDetails = new RequestDetails();
        //String identityURL=MessageUtil.getMessage
("IDENTITY_INSTANCE");
        //int portNumber=Integer.parseInt(MessageUtil.getMessage
("IDENTITY_PORT"));
        authorization="Basic " + encodeCredentialsBasic
(storageUserName, storagePassword);
        String url="https://"+identityHostName+
                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
+"/attributes/";

        Protocol https=null;
        //try {
            https = new Protocol("https", new
EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
        /*} catch (GeneralSecurityException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        }*/
        Protocol.registerProtocol("https", https);
        GetMethod method=new GetMethod(url);
        method.setRequestHeader("Authorization",authorization);
        method.setRequestHeader("Accept","application/xml");
        try {
            int responseCode=client.executeMethod(method);
            if(responseCode==200){
                InputStream is=method.getResponseBodyAsStream();
                BufferedReader bis=new BufferedReader(new
InputStreamReader(is));
                String temp=null,sKey=null, aKey=null;
                String accessKeySearchString="AccessKey</
Name><Value>";
                String secretKeySearchString="SecretKey</
Name><Value>";
                int searchStringLength=0;
                while((temp=bis.readLine())!=null){
                    if(temp.indexOf(accessKeySearchString)!=-1){
                        int beginIndex=temp.indexOf
(accessKeySearchString);
                        searchStringLength=accessKeySearchString.length
();
                        int endIndex=temp.indexOf("</
Value>",beginIndex);
                        aKey=temp.substring(beginIndex
+searchStringLength,endIndex);
                    }
                    if(temp.indexOf(secretKeySearchString)!=-1){
                        int beginIndex=temp.indexOf
(secretKeySearchString);
                        searchStringLength=secretKeySearchString.length
();
                        int endIndex=temp.indexOf("</
Value>",beginIndex);
                        sKey=temp.substring(beginIndex
+searchStringLength,endIndex);
                    }
                }
                setSecretKey(sKey);
                setAccessKey(aKey);
            } else {
                System.out.println("Not able to get the credentials.
Returned : " + responseCode + " response code!!!");
            }
        } catch (IOException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        }
    }


From banibrata.dutta at gmail.com  Sat Feb  7 11:27:04 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Sat, 7 Feb 2009 21:57:04 +0530
Subject: Java to Python
In-Reply-To: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
Message-ID: <3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>

Jython is not an option ?

On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:

> Hi
>
> I have a following class that is written Java and makes use of apache
> http client library,I am new to python can any one suggest me a python
> equivalent of this following class,
>
> Thanks ,
>
> public class Authenticate{
>
>  private String storageUserName=null;
>    private String storagePassword=null;
>    private String authorization=null;
>    private String identityHostName = null;
>    private String identityPortNumber = null;
>
>    private String accessKey=null;
>    private String secretKey=null;
>
>    public String getStoragePassword() {
>        return storagePassword;
>    }
>
>    public void setStoragePassword(String storagePassword) {
>        this.storagePassword = storagePassword;
>    }
>
>    public String getStorageUserName() {
>        return storageUserName;
>    }
>
>    public void setStorageUserName(String storageUserName) {
>        this.storageUserName = storageUserName;
>    }
>
>    public String getIdentityHostName() {
>        return identityHostName;
>    }
>
>    public void setIdentityHostName(String identityHostName) {
>        this.identityHostName = identityHostName;
>    }
>
>    public String getIdentityPortNumber() {
>        return identityPortNumber;
>    }
>
>    public void setIdentityPortNumber(String identityPortNumber) {
>        this.identityPortNumber = identityPortNumber;
>    }
>
>    public String getAccessKey() {
>        return accessKey;
>    }
>
>    public void setAccessKey(String accessKey) {
>        this.accessKey = accessKey;
>    }
>
>    public String getSecretKey() {
>        return secretKey;
>    }
>
>    public void setSecretKey(String secretKey) {
>        this.secretKey = secretKey;
>    }
>
>
>     /**
>     * <p>Convenience string for Base 64 encoding.</p>
>     */
>    private static final String BASE64_CHARS =
>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>            "abcdefghijklmnopqrstuvwxyz" +
>            "0123456789+/";
>
>    /**
>     * <p>Encode the specified credentials into a String as required
> by
>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
> rfc2617.txt">RFC 2617</a>).</p>
>     *
>     * @param username Username to be encoded
>     * @param password Password to be encoded
>     * @return String string containing encoded username and password.
>     */
>    public String encodeCredentialsBasic(String username, String
> password) {
>        String encode = username + ":" + password;
>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>        encode += "\0\0".substring(0, paddingCount);
>        StringBuilder encoded = new StringBuilder();
>
>        for (int i = 0; i < encode.length(); i += 3) {
>        }
>        return encoded.toString();
>    }
>
>    public void fetchDetails(){
>        HttpClient client=new HttpClient();
>        //reqDetails = new RequestDetails();
>        //String identityURL=MessageUtil.getMessage
> ("IDENTITY_INSTANCE");
>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
> ("IDENTITY_PORT"));
>        authorization="Basic " + encodeCredentialsBasic
> (storageUserName, storagePassword);
>        String url="https://"+identityHostName+
>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
> +"/attributes/";
>
>        Protocol https=null;
>        //try {
>            https = new Protocol("https", new
> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>        /*} catch (GeneralSecurityException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        } catch (IOException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        }*/
>        Protocol.registerProtocol("https", https);
>        GetMethod method=new GetMethod(url);
>        method.setRequestHeader("Authorization",authorization);
>        method.setRequestHeader("Accept","application/xml");
>        try {
>            int responseCode=client.executeMethod(method);
>            if(responseCode==200){
>                InputStream is=method.getResponseBodyAsStream();
>                BufferedReader bis=new BufferedReader(new
> InputStreamReader(is));
>                String temp=null,sKey=null, aKey=null;
>                String accessKeySearchString="AccessKey</
> Name><Value>";
>                String secretKeySearchString="SecretKey</
> Name><Value>";
>                int searchStringLength=0;
>                while((temp=bis.readLine())!=null){
>                    if(temp.indexOf(accessKeySearchString)!=-1){
>                        int beginIndex=temp.indexOf
> (accessKeySearchString);
>                        searchStringLength=accessKeySearchString.length
> ();
>                        int endIndex=temp.indexOf("</
> Value>",beginIndex);
>                        aKey=temp.substring(beginIndex
> +searchStringLength,endIndex);
>                    }
>                    if(temp.indexOf(secretKeySearchString)!=-1){
>                        int beginIndex=temp.indexOf
> (secretKeySearchString);
>                        searchStringLength=secretKeySearchString.length
> ();
>                        int endIndex=temp.indexOf("</
> Value>",beginIndex);
>                        sKey=temp.substring(beginIndex
> +searchStringLength,endIndex);
>                    }
>                }
>                setSecretKey(sKey);
>                setAccessKey(aKey);
>            } else {
>                System.out.println("Not able to get the credentials.
> Returned : " + responseCode + " response code!!!");
>            }
>        } catch (IOException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        }
>    }
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From zaheer.agadi at gmail.com  Sat Feb  7 11:49:48 2009
From: zaheer.agadi at gmail.com (zaheer agadi)
Date: Sat, 7 Feb 2009 22:19:48 +0530
Subject: Java to Python
In-Reply-To: <3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
Message-ID: <397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>

Hi Thanks for replying ..
I am actually looking for the pure Python options

Are there any equivalent clasees  for the following

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import
org.apache.commons.httpclient.contrib.ssl.EasySSLProtocolSocketFactory;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.protocol.Protocol;


Thanks for your help
-Zaheer

On Sat, Feb 7, 2009 at 9:57 PM, Banibrata Dutta
<banibrata.dutta at gmail.com>wrote:

> Jython is not an option ?
>
> On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:
>
>> Hi
>>
>> I have a following class that is written Java and makes use of apache
>> http client library,I am new to python can any one suggest me a python
>> equivalent of this following class,
>>
>> Thanks ,
>>
>> public class Authenticate{
>>
>>  private String storageUserName=null;
>>    private String storagePassword=null;
>>    private String authorization=null;
>>    private String identityHostName = null;
>>    private String identityPortNumber = null;
>>
>>    private String accessKey=null;
>>    private String secretKey=null;
>>
>>    public String getStoragePassword() {
>>        return storagePassword;
>>    }
>>
>>    public void setStoragePassword(String storagePassword) {
>>        this.storagePassword = storagePassword;
>>    }
>>
>>    public String getStorageUserName() {
>>        return storageUserName;
>>    }
>>
>>    public void setStorageUserName(String storageUserName) {
>>        this.storageUserName = storageUserName;
>>    }
>>
>>    public String getIdentityHostName() {
>>        return identityHostName;
>>    }
>>
>>    public void setIdentityHostName(String identityHostName) {
>>        this.identityHostName = identityHostName;
>>    }
>>
>>    public String getIdentityPortNumber() {
>>        return identityPortNumber;
>>    }
>>
>>    public void setIdentityPortNumber(String identityPortNumber) {
>>        this.identityPortNumber = identityPortNumber;
>>    }
>>
>>    public String getAccessKey() {
>>        return accessKey;
>>    }
>>
>>    public void setAccessKey(String accessKey) {
>>        this.accessKey = accessKey;
>>    }
>>
>>    public String getSecretKey() {
>>        return secretKey;
>>    }
>>
>>    public void setSecretKey(String secretKey) {
>>        this.secretKey = secretKey;
>>    }
>>
>>
>>     /**
>>     * <p>Convenience string for Base 64 encoding.</p>
>>     */
>>    private static final String BASE64_CHARS =
>>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>>            "abcdefghijklmnopqrstuvwxyz" +
>>            "0123456789+/";
>>
>>    /**
>>     * <p>Encode the specified credentials into a String as required
>> by
>>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
>> rfc2617.txt <http://www.ietf.org/rfc/%0Arfc2617.txt>">RFC 2617</a>).</p>
>>     *
>>     * @param username Username to be encoded
>>     * @param password Password to be encoded
>>     * @return String string containing encoded username and password.
>>     */
>>    public String encodeCredentialsBasic(String username, String
>> password) {
>>        String encode = username + ":" + password;
>>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>>        encode += "\0\0".substring(0, paddingCount);
>>        StringBuilder encoded = new StringBuilder();
>>
>>        for (int i = 0; i < encode.length(); i += 3) {
>>        }
>>        return encoded.toString();
>>    }
>>
>>    public void fetchDetails(){
>>        HttpClient client=new HttpClient();
>>        //reqDetails = new RequestDetails();
>>        //String identityURL=MessageUtil.getMessage
>> ("IDENTITY_INSTANCE");
>>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
>> ("IDENTITY_PORT"));
>>        authorization="Basic " + encodeCredentialsBasic
>> (storageUserName, storagePassword);
>>        String url="https://"+identityHostName+
>>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
>> +"/attributes/";
>>
>>        Protocol https=null;
>>        //try {
>>            https = new Protocol("https", new
>> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>>        /*} catch (GeneralSecurityException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        } catch (IOException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        }*/
>>        Protocol.registerProtocol("https", https);
>>        GetMethod method=new GetMethod(url);
>>        method.setRequestHeader("Authorization",authorization);
>>        method.setRequestHeader("Accept","application/xml");
>>        try {
>>            int responseCode=client.executeMethod(method);
>>            if(responseCode==200){
>>                InputStream is=method.getResponseBodyAsStream();
>>                BufferedReader bis=new BufferedReader(new
>> InputStreamReader(is));
>>                String temp=null,sKey=null, aKey=null;
>>                String accessKeySearchString="AccessKey</
>> Name><Value>";
>>                String secretKeySearchString="SecretKey</
>> Name><Value>";
>>                int searchStringLength=0;
>>                while((temp=bis.readLine())!=null){
>>                    if(temp.indexOf(accessKeySearchString)!=-1){
>>                        int beginIndex=temp.indexOf
>> (accessKeySearchString);
>>                        searchStringLength=accessKeySearchString.length
>> ();
>>                        int endIndex=temp.indexOf("</
>> Value>",beginIndex);
>>                        aKey=temp.substring(beginIndex
>> +searchStringLength,endIndex);
>>                    }
>>                    if(temp.indexOf(secretKeySearchString)!=-1){
>>                        int beginIndex=temp.indexOf
>> (secretKeySearchString);
>>                        searchStringLength=secretKeySearchString.length
>> ();
>>                        int endIndex=temp.indexOf("</
>> Value>",beginIndex);
>>                        sKey=temp.substring(beginIndex
>> +searchStringLength,endIndex);
>>                    }
>>                }
>>                setSecretKey(sKey);
>>                setAccessKey(aKey);
>>            } else {
>>                System.out.println("Not able to get the credentials.
>> Returned : " + responseCode + " response code!!!");
>>            }
>>        } catch (IOException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        }
>>    }
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> regards,
> Banibrata
> http://www.linkedin.com/in/bdutta
>
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From alex at a13x.net  Sat Feb  7 12:09:42 2009
From: alex at a13x.net (Aleksandar Radulovic)
Date: Sat, 7 Feb 2009 17:09:42 +0000
Subject: Java to Python
In-Reply-To: <397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
	<397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
Message-ID: <845b10c50902070909r646b16a2rddc6e0e19c2df4d1@mail.gmail.com>

Hi,

This looks like a perfect job for httplib and urllib2 modules.

On Sat, Feb 7, 2009 at 4:49 PM, zaheer agadi <zaheer.agadi at gmail.com> wrote:
> Hi Thanks for replying ..
> I am actually looking for the pure Python options
>
> Are there any equivalent clasees  for the following
>
> import org.apache.commons.httpclient.HttpClient;
> import org.apache.commons.httpclient.HttpException;
> import
> org.apache.commons.httpclient.contrib.ssl.EasySSLProtocolSocketFactory;
> import org.apache.commons.httpclient.methods.GetMethod;
> import org.apache.commons.httpclient.protocol.Protocol;
>
>
> Thanks for your help
> -Zaheer
>
> On Sat, Feb 7, 2009 at 9:57 PM, Banibrata Dutta <banibrata.dutta at gmail.com>
> wrote:
>>
>> Jython is not an option ?
>>
>> On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:
>>>
>>> Hi
>>>
>>> I have a following class that is written Java and makes use of apache
>>> http client library,I am new to python can any one suggest me a python
>>> equivalent of this following class,
>>>
>>> Thanks ,
>>>
>>> public class Authenticate{
>>>
>>>  private String storageUserName=null;
>>>    private String storagePassword=null;
>>>    private String authorization=null;
>>>    private String identityHostName = null;
>>>    private String identityPortNumber = null;
>>>
>>>    private String accessKey=null;
>>>    private String secretKey=null;
>>>
>>>    public String getStoragePassword() {
>>>        return storagePassword;
>>>    }
>>>
>>>    public void setStoragePassword(String storagePassword) {
>>>        this.storagePassword = storagePassword;
>>>    }
>>>
>>>    public String getStorageUserName() {
>>>        return storageUserName;
>>>    }
>>>
>>>    public void setStorageUserName(String storageUserName) {
>>>        this.storageUserName = storageUserName;
>>>    }
>>>
>>>    public String getIdentityHostName() {
>>>        return identityHostName;
>>>    }
>>>
>>>    public void setIdentityHostName(String identityHostName) {
>>>        this.identityHostName = identityHostName;
>>>    }
>>>
>>>    public String getIdentityPortNumber() {
>>>        return identityPortNumber;
>>>    }
>>>
>>>    public void setIdentityPortNumber(String identityPortNumber) {
>>>        this.identityPortNumber = identityPortNumber;
>>>    }
>>>
>>>    public String getAccessKey() {
>>>        return accessKey;
>>>    }
>>>
>>>    public void setAccessKey(String accessKey) {
>>>        this.accessKey = accessKey;
>>>    }
>>>
>>>    public String getSecretKey() {
>>>        return secretKey;
>>>    }
>>>
>>>    public void setSecretKey(String secretKey) {
>>>        this.secretKey = secretKey;
>>>    }
>>>
>>>
>>>     /**
>>>     * <p>Convenience string for Base 64 encoding.</p>
>>>     */
>>>    private static final String BASE64_CHARS =
>>>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>>>            "abcdefghijklmnopqrstuvwxyz" +
>>>            "0123456789+/";
>>>
>>>    /**
>>>     * <p>Encode the specified credentials into a String as required
>>> by
>>>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
>>> rfc2617.txt">RFC 2617</a>).</p>
>>>     *
>>>     * @param username Username to be encoded
>>>     * @param password Password to be encoded
>>>     * @return String string containing encoded username and password.
>>>     */
>>>    public String encodeCredentialsBasic(String username, String
>>> password) {
>>>        String encode = username + ":" + password;
>>>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>>>        encode += "\0\0".substring(0, paddingCount);
>>>        StringBuilder encoded = new StringBuilder();
>>>
>>>        for (int i = 0; i < encode.length(); i += 3) {
>>>        }
>>>        return encoded.toString();
>>>    }
>>>
>>>    public void fetchDetails(){
>>>        HttpClient client=new HttpClient();
>>>        //reqDetails = new RequestDetails();
>>>        //String identityURL=MessageUtil.getMessage
>>> ("IDENTITY_INSTANCE");
>>>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
>>> ("IDENTITY_PORT"));
>>>        authorization="Basic " + encodeCredentialsBasic
>>> (storageUserName, storagePassword);
>>>        String url="https://"+identityHostName+
>>>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
>>> +"/attributes/";
>>>
>>>        Protocol https=null;
>>>        //try {
>>>            https = new Protocol("https", new
>>> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>>>        /*} catch (GeneralSecurityException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        } catch (IOException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        }*/
>>>        Protocol.registerProtocol("https", https);
>>>        GetMethod method=new GetMethod(url);
>>>        method.setRequestHeader("Authorization",authorization);
>>>        method.setRequestHeader("Accept","application/xml");
>>>        try {
>>>            int responseCode=client.executeMethod(method);
>>>            if(responseCode==200){
>>>                InputStream is=method.getResponseBodyAsStream();
>>>                BufferedReader bis=new BufferedReader(new
>>> InputStreamReader(is));
>>>                String temp=null,sKey=null, aKey=null;
>>>                String accessKeySearchString="AccessKey</
>>> Name><Value>";
>>>                String secretKeySearchString="SecretKey</
>>> Name><Value>";
>>>                int searchStringLength=0;
>>>                while((temp=bis.readLine())!=null){
>>>                    if(temp.indexOf(accessKeySearchString)!=-1){
>>>                        int beginIndex=temp.indexOf
>>> (accessKeySearchString);
>>>                        searchStringLength=accessKeySearchString.length
>>> ();
>>>                        int endIndex=temp.indexOf("</
>>> Value>",beginIndex);
>>>                        aKey=temp.substring(beginIndex
>>> +searchStringLength,endIndex);
>>>                    }
>>>                    if(temp.indexOf(secretKeySearchString)!=-1){
>>>                        int beginIndex=temp.indexOf
>>> (secretKeySearchString);
>>>                        searchStringLength=secretKeySearchString.length
>>> ();
>>>                        int endIndex=temp.indexOf("</
>>> Value>",beginIndex);
>>>                        sKey=temp.substring(beginIndex
>>> +searchStringLength,endIndex);
>>>                    }
>>>                }
>>>                setSecretKey(sKey);
>>>                setAccessKey(aKey);
>>>            } else {
>>>                System.out.println("Not able to get the credentials.
>>> Returned : " + responseCode + " response code!!!");
>>>            }
>>>        } catch (IOException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        }
>>>    }
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>> --
>> regards,
>> Banibrata
>> http://www.linkedin.com/in/bdutta
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
a lex 13 x
http://www.a13x.info


From rdmurray at bitdance.com  Sat Feb  7 12:12:01 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 17:12:01 +0000 (UTC)
Subject: isfifo?
Message-ID: <gmkfd1$gbu$1@ger.gmane.org>

I've googled and looked through os.path, but I don't see a method for
determining if a path points to a FIFO.  Anyone know of a simple way to
do so?

--RDM



From marduk at letterboxes.org  Sat Feb  7 12:23:20 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sat, 07 Feb 2009 12:23:20 -0500
Subject: isfifo?
In-Reply-To: <gmkfd1$gbu$1@ger.gmane.org>
References: <gmkfd1$gbu$1@ger.gmane.org>
Message-ID: <1234027400.12522.2.camel@centar.nbk>

On Sat, 2009-02-07 at 17:12 +0000, rdmurray at bitdance.com wrote:
> I've googled and looked through os.path, but I don't see a method for
> determining if a path points to a FIFO.  Anyone know of a simple way to
> do so?

import os
import stat

st_mode = os.stat(path)[0]
isfifo = stat.S_ISFIFO(st_mode)




From Scott.Daniels at Acm.Org  Sat Feb  7 12:26:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 07 Feb 2009 09:26:40 -0800
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
Message-ID: <waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>

Terry wrote:
> ... I'm not saying that you can not have duplication in code. But it
> seems that the stable & successful software releases tend to have
> relatively stable duplication rate.

This analysis overlooks the fact that 3.0 _was_ a major change, and is
likely to grow cut-and-paste solutions to some problems as we switch to
Unicode strings from byte strings.  You are comparing a .0 version to
.5 versions.  I expect the polishing that follows as we go up through
.1, .2, and so on will lower those redundancy measures.

--Scott David Daniels
Scott.Daniels at Acm.Org


From martin at v.loewis.de  Sat Feb  7 12:28:15 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 18:28:15 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
Message-ID: <498dc4af$0$7112$9b622d9e@news.freenet.de>

> And I'm not saying that you can not have duplication in code. But it
> seems that the stable & successful software releases tend to have
> relatively stable duplication rate.

So if some software has an instable duplication rate, it probably
means that it is either not stable, or not successful.

In the case of Python 3.0, it's fairly obvious which one it is:
it's not stable. Indeed, Python 3.0 is a significant change from
Python 2.x. Of course, anybody following the Python 3 development
process could have told you see even without any code metrics.

I still find the raw numbers fairly useless. What matters more to
me is what specific code duplications have been added. Furthermore,
your Dup30 classification is not important to me, but I'm rather
after the nearly 2000 new chunks of code that has more than 60
subsequent tokens duplicated.

Regards,
Martin


From martin at v.loewis.de  Sat Feb  7 12:30:21 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 18:30:21 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
Message-ID: <498dc52d$0$7112$9b622d9e@news.freenet.de>

> But the duplication are always not very big, from about 100 lines
> (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> than Rate60, that means there are a lot of small duplications.

I don't find that important for code quality. It's the large chunks
that I would like to see de-duplicated (unless, of course, they are
in generated code, in which case I couldn't care less).

Unfortunately, none of the examples you have posted so far are
- large chunks, and
- new in 3.0.

Regards,
Martin


From martin at v.loewis.de  Sat Feb  7 12:35:02 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 18:35:02 +0100
Subject: isfifo?
In-Reply-To: <mailman.9056.1234026740.3487.python-list@python.org>
References: <mailman.9056.1234026740.3487.python-list@python.org>
Message-ID: <498dc646$0$7112$9b622d9e@news.freenet.de>

rdmurray at bitdance.com wrote:
> I've googled and looked through os.path, but I don't see a method for
> determining if a path points to a FIFO.  Anyone know of a simple way to
> do so?

def isfifo(fn):
  return stat.S_ISFIFO(os.stat(fn).st_mode)

HTH,
Martin


From rdmurray at bitdance.com  Sat Feb  7 13:28:50 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 18:28:50 +0000 (UTC)
Subject: isfifo?
References: <mailman.9056.1234026740.3487.python-list@python.org>
	<498dc646$0$7112$9b622d9e@news.freenet.de>
Message-ID: <gmkjt2$2hs$1@ger.gmane.org>

=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?= <martin at v.loewis.de> wrote:
> rdmurray at bitdance.com wrote:
> > I've googled and looked through os.path, but I don't see a method for
> > determining if a path points to a FIFO.  Anyone know of a simple way to
> > do so?
> 
> def isfifo(fn):
>   return stat.S_ISFIFO(os.stat(fn).st_mode)

Thanks.  I should have thought of looking in os.stat.  Odd that S_ISFIFO
didn't come up in my google search.

--RDM



From bdesth.quelquechose at free.quelquepart.fr  Sat Feb  7 14:06:20 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Sat, 07 Feb 2009 20:06:20 +0100
Subject: WebError documentation?
In-Reply-To: <rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
	<rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
Message-ID: <498de947$0$24412$426a74cc@news.free.fr>

Ron Garret a ?crit :
> In article <mailman.9037.1233981452.3487.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
>>> Is there any?  Where is it?  Extensive Googling has proven fruitless.
>> It's not a standard Python exception. A third-party library you're
>> using must be raising it. Check the exception traceback.
> 
> I see I did not make myself clear.

Now *that* is an understatement...

 >  I meant the Python software package
> called "weberror", not a generic web error.
> 
> http://pypi.python.org/pypi/WebError

Google is your friend:
http://bel-epa.com/docs/thirdparty/weberror/


From asmodai at in-nomine.org  Sat Feb  7 14:48:34 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Sat, 7 Feb 2009 20:48:34 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
Message-ID: <20090207194834.GP14658@nexus.in-nomine.org>

-On [20090207 18:25], Scott David Daniels (Scott.Daniels at Acm.Org) wrote:
>This analysis overlooks the fact that 3.0 _was_ a major change, and is
>likely to grow cut-and-paste solutions to some problems as we switch to
>Unicode strings from byte strings.

You'd best hope the copied section was thoroughly reviewed otherwise you're
duplicating a flaw across X other sections. And then you also best hope that
whoever finds said flaw and fixes it is also smart enough to check for
similar constructs around the code base.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From alex at a13x.net  Sat Feb  7 15:02:07 2009
From: alex at a13x.net (Aleksandar Radulovic)
Date: Sat, 7 Feb 2009 20:02:07 +0000
Subject: Java to Python
In-Reply-To: <397dfed40902070928k5d8fa7f5tc7ff0efe2d44599a@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
	<397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
	<845b10c50902070909h111ac623u565ec1d1c5d9ad52@mail.gmail.com>
	<397dfed40902070928k5d8fa7f5tc7ff0efe2d44599a@mail.gmail.com>
Message-ID: <845b10c50902071202p78aad1fao93c1d6a3148b589a@mail.gmail.com>

Hi,

On Sat, Feb 7, 2009 at 5:28 PM, zaheer agadi <zaheer.agadi at gmail.com> wrote:
> Thanks Alex,
>
>  Can you provide me more details on httplib and urllib ?

The details can be found in Python documentation (http://python.org/doc),
on these pages:
http://docs.python.org/library/httplib.html

I'm sure you can figure out the location of the documentation for the urllib2
module. Documentation includes examples too.


Regards,
alex.
-- 
a lex 13 x
http://www.a13x.info


From steve at holdenweb.com  Sat Feb  7 15:06:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 07 Feb 2009 15:06:12 -0500
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <20090207194834.GP14658@nexus.in-nomine.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
Message-ID: <gmkpjn$hsp$1@ger.gmane.org>

Jeroen Ruigrok van der Werven wrote:
> -On [20090207 18:25], Scott David Daniels (Scott.Daniels at Acm.Org) wrote:
>> This analysis overlooks the fact that 3.0 _was_ a major change, and is
>> likely to grow cut-and-paste solutions to some problems as we switch to
>> Unicode strings from byte strings.
> 
> You'd best hope the copied section was thoroughly reviewed otherwise you're
> duplicating a flaw across X other sections. And then you also best hope that
> whoever finds said flaw and fixes it is also smart enough to check for
> similar constructs around the code base.
> 
This is probably preferable to five different developers solving the
same problem five different ways and introducing three *different* bugs, no?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From theller at python.net  Sat Feb  7 15:37:14 2009
From: theller at python.net (Thomas Heller)
Date: Sat, 07 Feb 2009 21:37:14 +0100
Subject: py2exe and distutils
In-Reply-To: <gmk5o8$g34$00$1@news.t-online.com>
References: <gmk5o8$g34$00$1@news.t-online.com>
Message-ID: <6v69nnFi8bmqU1@mid.individual.net>

Maxim Demenko schrieb:
> Hi,
> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
> Now i can't list installed modules, here is the stacktrace:
> 
> 
> 
> help> modules
> 
> Please wait a moment while I gather a list of all available modules...
> 
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>    File "C:\Programme\Python25\lib\site.py", line 346, in __call__
>      return pydoc.help(*args, **kwds)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1649, in __call__
>      self.interact()
>    File "C:\Programme\Python25\lib\pydoc.py", line 1667, in interact
>      self.help(request)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1683, in help
>      elif request == 'modules': self.listmodules()
>    File "C:\Programme\Python25\lib\pydoc.py", line 1804, in listmodules
>      ModuleScanner().run(callback)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1855, in run
>      for importer, modname, ispkg in pkgutil.walk_packages():
>    File "C:\Programme\Python25\lib\pkgutil.py", line 110, in walk_packages
>      __import__(name)
>    File 
> "C:\Programme\Python25\Lib\site-packages\setuptools\__init__.py", line 
> 2, in <module>
>      from setuptools.extension import Extension, Library
>    File 
> "C:\Programme\Python25\Lib\site-packages\setuptools\extension.py", line 
> 2, in <module>
>      from dist import _get_unpatched
>    File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
> line 27, in <module>
>      _Distribution = _get_unpatched(_Distribution)
>    File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
> line 23, in _get_unpatched
>      "distutils has already been patched by %r" % cls
> AssertionError: distutils has already been patched by <class 
> py2exe.Distribution at 0x011B4F90>
> 
> Any suggestion, how to fix this issue?

Looks like a setuptools problem to me.  Here's the output on my system:

>>> help("modules")

Please wait a moment while I gather a list of all available modules...

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "c:\python25\lib\site.py", line 346, in __call__
    return pydoc.help(*args, **kwds)
  File "c:\python25\lib\pydoc.py", line 1645, in __call__
    self.help(request)
  File "c:\python25\lib\pydoc.py", line 1682, in help
    elif request == 'modules': self.listmodules()
  File "c:\python25\lib\pydoc.py", line 1803, in listmodules
    ModuleScanner().run(callback)
  File "c:\python25\lib\pydoc.py", line 1854, in run
    for importer, modname, ispkg in pkgutil.walk_packages():
  File "c:\python25\lib\pkgutil.py", line 125, in walk_packages
    for item in walk_packages(path, name+'.', onerror):
  File "c:\python25\lib\pkgutil.py", line 110, in walk_packages
    __import__(name)
  File "c:\python25\lib\site-packages\pyopengl-3.0.0b1-py2.5.egg\OpenGL\Tk\__init__.py", line 87, in <module>
    _default_root.tk.call('package', 'require', 'Togl')
_tkinter.TclError: can't find package Togl
>>> ^Z

Thomas


From mmanns at gmx.net  Sat Feb  7 15:39:17 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Sat, 7 Feb 2009 21:39:17 +0100
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
Message-ID: <20090207213917.24c8433a@gmx.net>

On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
Rhamphoryncus <rhamph at gmail.com> wrote:

> On Feb 6, 10:21?pm, rdmur... at bitdance.com wrote:
> > Quoth Mensanator <mensana... at aol.com>:
> > > def flatten(listOfLists):
> > > ? ? return list(chain.from_iterable(listOfLists))
> >
> > ? ? Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> > ? ? [GCC 4.3.2] on linux2
> > ? ? Type "help", "copyright", "credits" or "license" for more
> > information. >>> from itertools import chain
> > ? ? >>> list(chain.from_iterable([1, 2, [3, 4]]))
> > ? ? Traceback (most recent call last):
> > ? ? ? File "<stdin>", line 1, in <module>
> > ? ? TypeError: 'int' object is not iterable
> > ? ? >>> list(chain(*[1, 2, [3, 4]]))
> > ? ? Traceback (most recent call last):
> > ? ? ? File "<stdin>", line 1, in <module>
> > ? ? TypeError: 'int' object is not iterable
> > ? ? >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> > ? ? ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]
> 
> What usecase do you have for such inconsistently structured data?

I have a similar use case in pyspread, which is a Python spreadsheet
that employs numpy object arrays. Since the Python objects in the numpy
arrays are derived from user input, they can be anything, including
nested lists as well as strings, etc.

Since I consider my work-around that treats strings as a special case a
rather ugly hack, I would welcome a robust, generic approach to the
OP's problem.

Martin



From theller at python.net  Sat Feb  7 15:39:19 2009
From: theller at python.net (Thomas Heller)
Date: Sat, 07 Feb 2009 21:39:19 +0100
Subject: py2exe and distutils
In-Reply-To: <6v69nnFi8bmqU1@mid.individual.net>
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net>
Message-ID: <6v69rkFi8bmqU2@mid.individual.net>

> Maxim Demenko schrieb:
>> Hi,
>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
>> Now i can't list installed modules, here is the stacktrace:
[...]
>> Any suggestion, how to fix this issue?
> 
Thomas Heller schrieb:
> Looks like a setuptools problem to me.  Here's the output on my system:

Actually, I don't know where the problem is.  Maybe pydoc?

> 
> Thomas


From sjmachin at lexicon.net  Sat Feb  7 15:40:09 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 12:40:09 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
	<mailman.9049.1234017453.3487.python-list@python.org>
Message-ID: <c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>

On Feb 8, 1:37?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> LaundroMat wrote:
> > Hi,
>
> > I'm quite new to regular expressions, and I wonder if anyone here
> > could help me out.
>
> > I'm looking to split strings that ideally look like this: "Update: New
> > item (Household)" into a group.
> > This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> > ("Update", "New item", "(Household)")
>
> > Some strings will look like this however: "Update: New item (item)
> > (Household)". The expression above still does its job, as it returns
> > ("Update", "New item (item)", "(Household)").

Not quite true; it actually returns
    ('Update:', ' New item (item) ', '(Household)')
However ignoring the difference in whitespace, the OP's intention is
clear. Yours returns
    ('Update:', ' New item ', '(item) (Household)')


> > It does not work however when there is no text in parentheses (eg
> > "Update: new item"). How can I get the expression to return a tuple
> > such as ("Update:", "new item", None)?
>
> You need to make the last group optional and also make the middle group
> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.

Why do you perpetuate the redundant ^ anchor?

> (?:...) is the non-capturing version of (...).

Why do you use
    (?:(subpattern))?
instead of just plain
    (subpattern)?
?



From rhamph at gmail.com  Sat Feb  7 15:50:22 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sat, 7 Feb 2009 12:50:22 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
Message-ID: <afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>

On Feb 7, 1:39?pm, <mma... at gmx.net> wrote:
> On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
> Rhamphoryncus <rha... at gmail.com> wrote:
>
> > What usecase do you have for such inconsistently structured data?
>
> I have a similar use case in pyspread, which is a Python spreadsheet
> that employs numpy object arrays. Since the Python objects in the numpy
> arrays are derived from user input, they can be anything, including
> nested lists as well as strings, etc.
>
> Since I consider my work-around that treats strings as a special case a
> rather ugly hack, I would welcome a robust, generic approach to the
> OP's problem.

Can you explain this in a little more detail?


From aleksandr.goretoy at gmail.com  Sat Feb  7 15:51:58 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Sat, 7 Feb 2009 14:51:58 -0600
Subject: Where to host a (Python) project?
In-Reply-To: <fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com> <87bptgxu2y.fsf@benfinney.id.au>
	<fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>
Message-ID: <fa98a9e30902071251g7aea9b19l4ab0d434f154d4ee@mail.gmail.com>

If you don't mind changing dns entries. You can also use Google App Engine.
It's really nice.

http://code.google.com/appengine/docs/python/tools/webapp/overview.html

-Alex Goretoy
http://www.alexgoretoy.com



On Fri, Feb 6, 2009 at 1:07 AM, alex goretoy <aleksandr.goretoy at gmail.com>wrote:

> I use google code.
> http://code.google.com/p/pynutbutter
>
> -Alex Goretoy
> http://www.alexgoretoy.com
>
>
>
>
> On Thu, Feb 5, 2009 at 6:55 PM, Ben Finney <
> bignose+hates-spam at benfinney.id.au <bignose%2Bhates-spam at benfinney.id.au>>wrote:
>
>> aahz at pythoncraft.com (Aahz) writes:
>>
>> > In article <
>> 6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
>> > andrew cooke  <andrew at acooke.org> wrote:
>> > >hi, just fyi, i investigated this and you can join any publicly
>> > >readable group by sending an email to the "-subscribe" address. you
>> > >do not need a google login for this and, as far as i can tell, it
>> > >then operates for you like a normal mailing list.
>> >
>> > The same thing is theoretically true for Yahoo groups, but I've
>> > heard from people over the years about various difficulties fixing
>> > problems with list subscriptions in the absence of a real Yahoo
>> > login and I'm not particularly interested in finding out that the
>> > same thing ends up being true for Google lists.
>>
>> Indeed it does. I have succeeded in subscribing to Google mailing
>> lists in the absence of a Google account, but *managing* that
>> subscription thereafter in the absence of a Google account is
>> obnoxiously difficult. Your caution is well advised.
>>
>> --
>>  \                "I got fired from my job the other day. They said my |
>>  `\          personality was weird. ? That's okay, I have four more." |
>> _o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
>> Ben Finney
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From martin at v.loewis.de  Sat Feb  7 15:52:47 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 21:52:47 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <mailman.9062.1234037192.3487.python-list@python.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>	<20090207194834.GP14658@nexus.in-nomine.org>
	<mailman.9062.1234037192.3487.python-list@python.org>
Message-ID: <498df49f$0$11402$9b622d9e@news.freenet.de>

> This is probably preferable to five different developers solving the
> same problem five different ways and introducing three *different* bugs, no?

With the examples presented, I'm not convinced that there is actually
significant code duplication going on in the first place.

Regards,
Martin


From mdemenko at gmail.com  Sat Feb  7 16:20:01 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Sat, 07 Feb 2009 22:20:01 +0100
Subject: py2exe and distutils
In-Reply-To: <6v69rkFi8bmqU2@mid.individual.net>
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
Message-ID: <498DFB01.5060308@gmail.com>

Thomas Heller schrieb:
>> Maxim Demenko schrieb:
>>> Hi,
>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
>>> Now i can't list installed modules, here is the stacktrace:
> [...]
>>> Any suggestion, how to fix this issue?
> Thomas Heller schrieb:
>> Looks like a setuptools problem to me.  Here's the output on my system:
> 
> Actually, I don't know where the problem is.  Maybe pydoc?
> 
>> Thomas

Thank you Thomas,
i found http://thread.gmane.org/gmane.comp.python.distutils.devel/3340
and tried to import setuptools first - indeed, in this case the problem 
seems to be solved, however, would like to know, how to persist it.
If i put it into py2exe.__init__.py - is it a very bad idea?

Best regards

Maxim


From asmodai at in-nomine.org  Sat Feb  7 16:25:14 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Sat, 7 Feb 2009 22:25:14 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <gmkpjn$hsp$1@ger.gmane.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
	<gmkpjn$hsp$1@ger.gmane.org>
Message-ID: <20090207212514.GB58127@nexus.in-nomine.org>

-On [20090207 21:07], Steve Holden (steve at holdenweb.com) wrote:
>This is probably preferable to five different developers solving the
>same problem five different ways and introducing three *different* bugs, no?

I guess the answer would be 'that depends', but in most cases you would be
correct, yes.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From mmanns at gmx.net  Sat Feb  7 17:07:19 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Sat, 7 Feb 2009 23:07:19 +0100
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
	<afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>
Message-ID: <20090207230719.5bfd6022@gmx.net>

On Sat, 7 Feb 2009 12:50:22 -0800 (PST)
Rhamphoryncus <rhamph at gmail.com> wrote:

> On Feb 7, 1:39?pm, <mma... at gmx.net> wrote:
> > On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
> > Rhamphoryncus <rha... at gmail.com> wrote:
> >
> > > What usecase do you have for such inconsistently structured data?
> >
> > I have a similar use case in pyspread, which is a Python spreadsheet
> > that employs numpy object arrays. Since the Python objects in the
> > numpy arrays are derived from user input, they can be anything,
> > including nested lists as well as strings, etc.
> >
> > Since I consider my work-around that treats strings as a special
> > case a rather ugly hack, I would welcome a robust, generic approach
> > to the OP's problem.
> 
> Can you explain this in a little more detail?

In the application, there is one main numpy array of type "O".
Each element of the array corresponds to one cell in a grid. The user
may enter a Python expression into the grid cell. The input is
evaled and the result is stored in the numpy array (the actual process
is a bit more complicated). Therefore, the object inside a numpy array
element may be an inconsistent, nested, iterable type.

The user now may access the result grid via __getitem__. When doing
this, a numpy array that is as flat as possible while comprising the
maximum possible data depth is returned, i.e.:

1. Non-string and non-unicode iterables of similar length for each of
the cells form extra dimensions.

2. In order to remove different container types, the result is
flattened, cast into a numpy.array and re-shaped.

3. Dimensions of length 1 are eliminated.

Therefore, the user can conveniently use numpy ufuncs on the results.

I am referring to the flatten operation in step 2



From andrew at acooke.org  Sat Feb  7 17:08:09 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 7 Feb 2009 19:08:09 -0300 (CLST)
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <gmkpjn$hsp$1@ger.gmane.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
	<gmkpjn$hsp$1@ger.gmane.org>
Message-ID: <6ba795a7aadcaf351089065e775555ec.squirrel@acooke.dyndns.org>

Steve Holden wrote:
>> You'd best hope the copied section was thoroughly reviewed otherwise
>> you're
>> duplicating a flaw across X other sections. And then you also best hope
>> that
>> whoever finds said flaw and fixes it is also smart enough to check for
>> similar constructs around the code base.
>>
> This is probably preferable to five different developers solving the
> same problem five different ways and introducing three *different* bugs,
> no?

someone posted some numbers that suggested that more code than normal was
copied in python 3.0.  that seems reasonable, as others have said, because
it's a new major release.  but as far as i know, this is the first time
it's been raised.  so it seems like a useful piece of information that
might help improve python in some way.  which should be welcomed.

yet the general tone of the responses has been more defensive than i would
have expected.  i don't really understand why.  nothing really terrible,
given the extremes you get on the net in general, but still a little
disappointing.

the email quoted above is a typical example.  as i said - nothing
terrible, just a misleading false dichotomy.  yes, five people solving it
five different ways would be worse, but that doesn't mean there isn't some
better solution.  surely it would be preferable if there was one way, that
didn't involve copying code, that everyone could use?

i'm not saying there is such a solution.  i'm not even saying that there
is certainly a problem.  i'm just making the quiet observation that the
original information is interesting, might be useful, and should be
welcomed.

andrew




From martin at v.loewis.de  Sat Feb  7 17:36:25 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 23:36:25 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <mailman.9065.1234044505.3487.python-list@python.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>	<20090207194834.GP14658@nexus.in-nomine.org>	<gmkpjn$hsp$1@ger.gmane.org>
	<mailman.9065.1234044505.3487.python-list@python.org>
Message-ID: <498e0cea$0$30915$9b622d9e@news.freenet.de>

> yet the general tone of the responses has been more defensive than i would
> have expected.  i don't really understand why.  nothing really terrible,
> given the extremes you get on the net in general, but still a little
> disappointing.

I think this is fairly easy to explain. The OP closes with the question
"Does that say something about the code quality of Python3.0?"
thus suggesting that the quality of Python 3 is poor.

Nobody likes to hear that the quality of his work is poor. He then goes
on saying

"But it seems that the stable & successful software releases tend to
have relatively stable duplication rate."

suggesting that Python 3.0 cannot be successful, because it doesn't have
a relatively stable duplication rate.

Nobody likes to hear that a project one has put many month into cannot
be successful.

Hence the defensive responses.

> i'm not saying there is such a solution.  i'm not even saying that there
> is certainly a problem.  i'm just making the quiet observation that the
> original information is interesting, might be useful, and should be
> welcomed.

The information is interesting. I question whether it is useful as-is,
as it doesn't tell me *what* code got duplicated (and it seems it is
also incorrect, since it includes analysis of generated code). While I
can welcome the information, I cannot welcome the conclusion that the
OP apparently draws from them.

Regards,
Martin


From robert.kern at gmail.com  Sat Feb  7 17:47:55 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 07 Feb 2009 16:47:55 -0600
Subject: Newbie SWMixer / numpy help - AssertionError
In-Reply-To: <pej066x0mc.ln2@phoenix.fire>
References: <pej066x0mc.ln2@phoenix.fire>
Message-ID: <gml32s$ass$1@ger.gmane.org>

On 2009-02-07 08:46, Peter Chant wrote:
> Hello,
>
> I'm a bit of a python newby.  I want to play and record sound
> simultaneously.  SWMixer seems able to do this but the examples use WAV
> files.  I'm trying to play a test tone.  Can anyone give me a steer as to
> why this fails?

Looking at the SWMixer docs, you probably want

   snd = swmixer.Sound(data=tone_data)

Well, sort of. You probably need to scale your data and convert it to int16 
format. It's currently in floating point format.

When asking about why something fails, it helps a lot if you specify exactly how 
it fails and what you expected to happen. Copy-and-paste any error messages exactly.

If you need more help with SWMixer's API, I recommend asking the author. It's 
not in widespread use, so he can probably give you better and faster help than 
we can.

If you need more help with numpy, specifically, you can ask on the 
numpy-discussion mailing list. numpy *is* in widespread use, but there's a 
higher concentration of helpful numpy users over there.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From rdsc-python at tigana.org  Sat Feb  7 17:50:04 2009
From: rdsc-python at tigana.org (Randy Smith)
Date: Sat, 7 Feb 2009 17:50:04 -0500
Subject: TkInter: Problem with propagation of resize events through geometry
	manager hierarchy?
Message-ID: <6A117BEC-C653-4092-BC4B-D4FC3F0CB486@tigana.org>


Hi!  I'm looking for help with a Tkinter program's handling of resize.
I'm trying to do a fairly simple widget that shows a cropped part of a
larger image, and let's you navigate within the larger image through a
variety of methods.  The widget hierarchy is:

root
   ImageWidget (my class)
     Label (contains the image)
     Horizontal Scroll Bar
     Vertical scroll bar

The cropping and scrolling works fine.  But when I try to add
responding to resize events, I get into trouble.  Specifically:
* When I naively change the size of the image shown to be borderwidth
   less than the size indicated in the configure event, the size of the
   image shown grows gradually but inexorably when I start the test
   app.  (Sorta scary, actually :-})
* When I fiddle a bit to figure out what the actual difference in size
   is between the Configure event and the image that can be displayed,
   I get a vibrating, jagged display of the image.

Investigation suggests that multiple configure events are hitting the
label in response to each user resize with different sizes.  I'm
guessing that when I resize the image in response to those different
events, that creates new resize events propagating through the window
manager hierarchy, which creates new configure events, which means my
handler changes the image size, which ... you get the idea.  However,
everything seems to work fine if I leave out the scroll bars and just
have a label in a frame inside the root window; the image resizes
fine.  If the scroll bars are in place but I don't have the image
resize bound to the configure event, I get two sets of resize events
propagaing through the system on startup; without, I just get one.

Event lists and code included below.  Any help would be appreciated.
Thanks!

       	    	     	      	      	  -- Randy Smith

-- Event list on startup with scroll bars:

<receiving widget>: width height
root :  220 220
root :  1 1
iwidget :  220 220
root :  220 220
vscroll :  16 204
root :  16 204
hscroll :  204 16
root :  204 16
ilabel :  204 204
root :  204 204
vscroll :  15 205
root :  15 205
hscroll :  205 15
root :  205 15
ilabel :  205 205
root :  205 205
root :  219 219
ilabel :  205 205
root :  205 205
hscroll :  205 15
root :  205 15
vscroll :  15 205
root :  15 205
iwidget :  219 219
root :  219 219
vscroll :  15 204
root :  15 204
hscroll :  204 15
root :  204 15
ilabel :  204 204
root :  204 204

-- Event list on startup without scroll bars

root :  204 204
root :  1 1
iwidget :  204 204
root :  204 204
ilabel :  204 204
root :  204 204

-- Code, without image resize.  If you want to see the vibration,
    uncomment the line
         self.label.bind("<Configure>", self.reconfigure, "+")
    To actually run it you'll need an image "test.tiff" in the current
    directory (any image of size > 200x200 will do) and access to the
    python imaging library (PIL), but I hope the code is pretty clear
    (other than the math transforming between various coordinate
    systems, which I don't believe is relevant; focus on
    reconfigure(), refresh, and __init__).

#!/usr/bin/python

import traceback
from Tkinter import *
from PIL import Image
import ImageTk

debug = 4

def display_args(*args):
     print "Args: ", args

def display_event(event):
     print event.__dict__

def display_tag_and_size(tag, event):
     print tag, ": ", event.width, event.height

class NotYetImplemented(Exception): pass

def mapnum(x, fromrange, torange):
     assert fromrange[0] <= x < fromrange[1], (fromrange[0], x,  
fromrange[1])
     assert torange[0] < torange[1], (torange[0], torange[1])
     ## Need to force floating point
     x *= 1.0
     return (x - fromrange[0]) / (fromrange[1] - fromrange[0]) *  
(torange[1] - torange[0]) + torange[0]

class ImageWidget(Frame):
     def __init__(self, parent, gfunc, image_size,
                  starting_zoom=1,
                  starting_ul=(0,0),
                  starting_size = None):
         """Create an Image Widget which will display an image based  
on the
         function passed.  That function will be called with the  
arguments
         (zoom_factor, (xstart, xend), (ystart, yend)) and must return a
         TkInter PhotoImage object of size (xend-xstart, yend-ystart).
         IMAGE_SIZE describes the "base size" of the image being  
backed by
         gfunc.
         starting_* describes the starting window on the image."""

         ## Default starting size to whole image
         if not starting_size: starting_size = image_size

         ## Init parent
         Frame.__init__(self, parent)
         self.bind("<Configure>",
                   lambda e, t="iwidget": display_tag_and_size(t, e))
         ## Base image parameters
         self.generator_func = gfunc
         self.isize = image_size

         ## Modifier of base image size for coords currently working in
         self.zoom = starting_zoom

         ## Interval of augmented (zoomed) image currently shown
         ## Note that these must be integers; these map directly to  
pixels
         self.xint = [starting_ul[0], starting_ul[0] + starting_size[0]]
         self.yint = [starting_ul[1], starting_ul[1] + starting_size[1]]

         ## Widgets
         self.label = Label(self)
         print type(self.label["borderwidth"])
         self.label.bind("<Configure>",
                         lambda e, t="ilabel": display_tag_and_size(t,  
e))
         self.labelborderwidth = 4 	# XXX: Constant because I can't  
manage
         				# to get the value of
         				# self.label["borderwidth"] as a number :-?
         self.hscroll = Scrollbar(self, orient = HORIZONTAL,
                                  command = lambda *args:  
self.scmd(False, *args))
         self.hscroll.bind("<Configure>",
                         lambda e, t="hscroll":  
display_tag_and_size(t, e))

         self.vscroll = Scrollbar(self, orient = VERTICAL,
                                  command = lambda *args:  
self.scmd(True, *args))
         self.vscroll.bind("<Configure>",
                           lambda e, t="vscroll":  
display_tag_and_size(t, e))

#        self.label.bind("<Configure>", self.reconfigure, "+")

         ## Configure widgets
         self.label.grid(row = 0, column = 0, sticky=N+S+E+W)
         self.hscroll.grid(row = 1, column = 0, sticky=E+W)
         self.vscroll.grid(row = 0, column = 1, sticky=N+S)
         self.columnconfigure(0, weight=1)
         self.rowconfigure(0, weight=1)

         ## And display
         self.refresh()

     def refresh(self):
         """Bring the image in the frame and the scroll bars in line  
with the
         current values."""
         self.image = self.generator_func(self.zoom, self.xint,  
self.yint)
         self.label["image"] = self.image
         ## Map x&y interval into unit interval for scroll bars.
         scroll_settings = (
             (mapnum(self.xint[0],
                     (0, self.isize[0] * self.zoom),
                     (0, 1)),
              mapnum(self.xint[1],
                     (0, self.isize[0] * self.zoom),
                     (0, 1))),
             (mapnum(self.yint[0],
                     (0, self.isize[1] * self.zoom),
                     (0, 1)),
              mapnum(self.yint[1],
                     (0, self.isize[1] * self.zoom),
                     (0, 1))))
         if debug > 5:
             print scroll_settings
         self.hscroll.set(*scroll_settings[0])
         self.vscroll.set(*scroll_settings[1])

     def reconfigure(self, event):
         print self.label["width"], self.label["height"], event.__dict__
         self.xint[1] = min(self.xint[0]+event.width -  
self.labelborderwidth,
                            int(self.isize[0]*self.zoom))
         self.yint[1] = min(self.yint[0]+event.height -  
self.labelborderwidth,
                            int(self.isize[1]*self.zoom))
         self.refresh()

     def scmd(self, isy, type, num, what = None):
         """Takes input args, changes either xint or yint, and calls
         refresh to update the entire image."""
         ## Figure out interval to modify and base image size to work  
off
         if isy:
             interval = self.yint
             int_range = self.isize[1] * self.zoom
         else:
             interval = self.xint
             int_range = self.isize[0] * self.zoom

         ## Figure out the width
         int_width = interval[1] - interval[0]

         ## Transform input
         num = float(num)

         if type == MOVETO:
             # num Describes the location of the low end of the slider
             interval[0] = mapnum(num, (0, 1), (0, int_range))
         elif type == SCROLL:
             if what == "units":
                 interval[0] += num
             else:
                 assert what == "pages", what
                 interval[0] += num * int_width

             if interval[0] < 0: interval[0] = 0
             if interval[0] > int_range - int_width:
                 interval[0] = int_range - int_width
         interval[0] = int(interval[0])
         interval[1] = interval[0] + int_width
         assert type == MOVETO, type
         if debug > 5:
             print "yscroll" if isy else "xscroll", num, interval[0],  
interval[1]
         self.refresh()

## Room for optimization here; don't need to resize the whole image
def gfunc_for_image(image, zoom, xint, yint):
     bbox = image.getbbox()
     isize = (bbox[2] - bbox[0], bbox[3] - bbox[1])
     ssize = (isize[0] * zoom, isize[1] * zoom)

     if debug > 5:
         print zoom, xint, yint, isize, ssize
     ri = image.resize(ssize, Image.BILINEAR)
     ci = ri.crop((xint[0],yint[0],xint[1],yint[1]))
     return ImageTk.PhotoImage(ci)

def IWFromFile(parent, file, starting_size = None):
     "Return an ImageWidget object based on an image on a file."
     baseimage = Image.open(file)
     (ulx, uly, lrx, lry) = baseimage.getbbox()
     return ImageWidget(parent,
                        lambda z,xint,yint,i=baseimage:  
gfunc_for_image(i, z, xint, yint),
                        (lrx - ulx, lry - uly),
                        starting_size = starting_size)

def IWFromImage(parent, img, starting_size = None):
     "Return an imageWidget object based on a PIL image passed in."
     (ulx, uly, lrx, lry) = img.getbbox()
     return ImageWidget(parent,
                        lambda z,xint,yint,i=img: gfunc_for_image(i,  
z, xint, yint),
                        (lrx - ulx, lry - uly),
                        starting_size = starting_size)


if __name__ == "__main__":
     root = Tk()
     root.resizable(True, True)

     root.bind("<Configure>", lambda e, t="root":  
display_tag_and_size(t, e))
     iw = IWFromFile(root, "test.tiff", starting_size = (200, 200))
     print "Gridding iwidget."
     iw.grid(row=0,column=0,sticky=N+S+E+W)
     print "Configuring root row."
     root.rowconfigure(0, weight=1)
     print "Configuring root column."
     root.columnconfigure(0, weight=1)
     print "Mainlooping."
     iw.mainloop()








From chohazel at gmail.com  Sat Feb  7 18:03:07 2009
From: chohazel at gmail.com (chohazel at gmail.com)
Date: Sat, 7 Feb 2009 15:03:07 -0800 (PST)
Subject: MacPython 2.5 IDLE font size
Message-ID: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>

Hi,
Is there a way to adjust the default font size in IDLE, in MacPython
2.5? The default now is too tiny.
I have to use this version of MacPython. As far as I searched, I can't
find how I do this.
Thanks.


From google at mrabarnett.plus.com  Sat Feb  7 18:15:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 23:15:05 +0000
Subject: Trouble with regular expressions
In-Reply-To: <c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>	<mailman.9049.1234017453.3487.python-list@python.org>
	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
Message-ID: <498E15F9.4050907@mrabarnett.plus.com>

John Machin wrote:
> On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> LaundroMat wrote:
>>> Hi,
>>> I'm quite new to regular expressions, and I wonder if anyone here
>>> could help me out.
>>> I'm looking to split strings that ideally look like this: "Update: New
>>> item (Household)" into a group.
>>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
>>> ("Update", "New item", "(Household)")
>>> Some strings will look like this however: "Update: New item (item)
>>> (Household)". The expression above still does its job, as it returns
>>> ("Update", "New item (item)", "(Household)").
> 
> Not quite true; it actually returns
>     ('Update:', ' New item (item) ', '(Household)')
> However ignoring the difference in whitespace, the OP's intention is
> clear. Yours returns
>     ('Update:', ' New item ', '(item) (Household)')
> 
The OP said it works OK, which I took to mean that the OP was OK with
the extra whitespace, which can be easily stripped off. Close enough!
> 
>>> It does not work however when there is no text in parentheses (eg
>>> "Update: new item"). How can I get the expression to return a tuple
>>> such as ("Update:", "new item", None)?
>> You need to make the last group optional and also make the middle group
>> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
> 
> Why do you perpetuate the redundant ^ anchor?
> 
The OP didn't say whether search() or match() was being used. With the ^
it doesn't matter.

>> (?:...) is the non-capturing version of (...).
> 
> Why do you use
>     (?:(subpattern))?
> instead of just plain
>     (subpattern)?
> ?
> 
Oops, you're right. I was distracted by the \( and \)! :-)


From vitaliyy at gmail.com  Sat Feb  7 18:23:01 2009
From: vitaliyy at gmail.com (Vitaliy Yermolenko)
Date: Sun, 8 Feb 2009 01:23:01 +0200
Subject: Python on TV-centric platforms
Message-ID: <ccbb236e0902071523h76059a3dl34f35a01ed8c1d16@mail.gmail.com>

Hi,

Any chance to see Python to be ready for "Widget Development Kit (WDK)
to third-party developers to create applications and services for
viewing on TVs, or to move applications to the TV from the PC viewing
environment" as on
http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx?
Thoughts/ideas?

WBR, Vitaliy.


From sjmachin at lexicon.net  Sat Feb  7 18:48:02 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 15:48:02 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
	<mailman.9049.1234017453.3487.python-list@python.org>
	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
	<mailman.9068.1234048507.3487.python-list@python.org>
Message-ID: <686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>

On Feb 8, 10:15?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> John Machin wrote:
> > On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> LaundroMat wrote:
> >>> Hi,
> >>> I'm quite new to regular expressions, and I wonder if anyone here
> >>> could help me out.
> >>> I'm looking to split strings that ideally look like this: "Update: New
> >>> item (Household)" into a group.
> >>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> >>> ("Update", "New item", "(Household)")
> >>> Some strings will look like this however: "Update: New item (item)
> >>> (Household)". The expression above still does its job, as it returns
> >>> ("Update", "New item (item)", "(Household)").
>
> > Not quite true; it actually returns
> > ? ? ('Update:', ' New item (item) ', '(Household)')
> > However ignoring the difference in whitespace, the OP's intention is
> > clear. Yours returns
> > ? ? ('Update:', ' New item ', '(item) (Household)')
>
> The OP said it works OK, which I took to mean that the OP was OK with
> the extra whitespace, which can be easily stripped off. Close enough!

As I said, the whitespace difference [between what the OP said his
regex did and what it actually does] is not the problem. The problem
is that the OP's "works OK" included (item) in the 2nd group, whereas
yours includes (item) in the 3rd group.

>
> >>> It does not work however when there is no text in parentheses (eg
> >>> "Update: new item"). How can I get the expression to return a tuple
> >>> such as ("Update:", "new item", None)?
> >> You need to make the last group optional and also make the middle group
> >> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
>
> > Why do you perpetuate the redundant ^ anchor?
>
> The OP didn't say whether search() or match() was being used. With the ^
> it doesn't matter.

It *does* matter. re.search() is suboptimal; after failing at the
first position, it's not smart enough to give up if the pattern has a
front anchor.

[win32, 2.6.1]
C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.17 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
0*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.17 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
*'x'" "assert not rx.search(txt)"
100000 loops, best of 3: 4.37 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
0*'x'" "assert not rx.search(txt)"
10000 loops, best of 3: 34.1 usec per loop

Corresponding figures for 3.0 are 1.02, 1.02, 3.99, and 32.9



From nick at stinemates.org  Sat Feb  7 18:56:45 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sat, 7 Feb 2009 15:56:45 -0800
Subject: Portable way to refer to the null device?
In-Reply-To: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <20090207235645.GA28442@beauTy.hsd1.ca.comcast.net>

On Fri, Feb 06, 2009 at 07:32:20PM -0800, Roy Smith wrote:
> I need to run a command using subprocess.Popen() and have stdin
> connected to the null device.  On unix, I would do:
> 
>         self.process = subprocess.Popen(argv,
>                                         env=new_env,
>                                         stdout=open(outfile, 'w'),
>                                         stderr=open(errfile, 'w'),
>                                         stdin=open('/dev/null')
>                                         )
> 
> but that's not portable to windows.  Does Python have a portable way
> to get a file object connected to the null device, regardless of what
> operating system you're running on?

I normally just implement my own object:

class DevNull:
    def write(self, str):
        pass


From nick at stinemates.org  Sat Feb  7 19:09:48 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sat, 7 Feb 2009 16:09:48 -0800
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>

On Fri, Feb 06, 2009 at 09:16:02PM -0700, Vincent Davis wrote:
> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.I
> know a little html but am not sure how to integrate python or know what
> servers will handle it .....
> 
> Thanks
> Vincent Davis

I'd suggest CherryPy[1]. It's fairly welcoming to newbies, because the
web server and the framework and bundled together.

1: http://www.cherrypy.org/

HTH,
Nick



From deets at nospam.web.de  Sat Feb  7 19:32:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 01:32:00 +0100
Subject: Python on TV-centric platforms
In-Reply-To: <mailman.9069.1234048986.3487.python-list@python.org>
References: <mailman.9069.1234048986.3487.python-list@python.org>
Message-ID: <6v6ng1Fia9qkU1@mid.uni-berlin.de>

Vitaliy Yermolenko schrieb:
> Hi,
> 
> Any chance to see Python to be ready for "Widget Development Kit (WDK)
> to third-party developers to create applications and services for
> viewing on TVs, or to move applications to the TV from the PC viewing
> environment" as on
> http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx?
> Thoughts/ideas?


Given that the site shows not much more but marketing statements for 
otherwise technically unspecified systems (mentioning only a few 
buzzwords like JS & AJAX), I guess the answer is: sure python is ready. 
It is for example used in superkaramba, a widget-application even older 
than the OSX variant of the same concept.

But unless you have a concrete system in mind, with a toolchain and 
actual WDK, the answer can't possibly be final.

Diez


From exarkun at divmod.com  Sat Feb  7 19:34:04 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Sat, 7 Feb 2009 19:34:04 -0500
Subject: Portable way to refer to the null device?
In-Reply-To: <20090207235645.GA28442@beauTy.hsd1.ca.comcast.net>
Message-ID: <20090208003404.12853.378576398.divmod.quotient.7217@henry.divmod.com>

On Sat, 7 Feb 2009 15:56:45 -0800, nick at stinemates.org wrote:
>On Fri, Feb 06, 2009 at 07:32:20PM -0800, Roy Smith wrote:
>> I need to run a command using subprocess.Popen() and have stdin
>> connected to the null device.  On unix, I would do:
>>
>>         self.process = subprocess.Popen(argv,
>>                                         env=new_env,
>>                                         stdout=open(outfile, 'w'),
>>                                         stderr=open(errfile, 'w'),
>>                                         stdin=open('/dev/null')
>>                                         )
>>
>> but that's not portable to windows.  Does Python have a portable way
>> to get a file object connected to the null device, regardless of what
>> operating system you're running on?
>
>I normally just implement my own object:
>
>class DevNull:
>    def write(self, str):
>        pass

I bet this won't work.  It needs to be a "real" file - have a file
descriptor or a handle or something.

Instead, try opening os.devnull.

Jean-Paul


From terry.yinzhe at gmail.com  Sat Feb  7 19:51:15 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 16:51:15 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
Message-ID: <d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>

On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
> Terry <terry.yinzhe <at> gmail.com> writes:
>
> > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > Do you by any chance have a few examples of these? There is a lot of
> > > idiomatic code in python to e.g. acquire and release the GIL or doing
> > > refcount-stuff. If that happens to be done with rather generic names as
> > > arguments, I can well imagine that as being the cause.
> > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
>
> This isn't really fair because Python-ast.c is auto generated. ;)

Oops! I don't know that! Then the analysis will not be valid, since
too many duplications are from there.


From terry.yinzhe at gmail.com  Sat Feb  7 20:12:46 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 17:12:46 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
Message-ID: <dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>

On 2?8?, ??8?51?, Terry <terry.yin... at gmail.com> wrote:
> On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
>
> > Terry <terry.yinzhe <at> gmail.com> writes:
>
> > > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > > Do you by any chance have a few examples of these? There is a lot of
> > > > idiomatic code in python to e.g. acquire and release the GIL or doing
> > > > refcount-stuff. If that happens to be done with rather generic names as
> > > > arguments, I can well imagine that as being the cause.
> > > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
>
> > This isn't really fair because Python-ast.c is auto generated. ;)
>
> Oops! I don't know that! Then the analysis will not be valid, since
> too many duplications are from there.

Hey!

I have to say sorry because I found I made a mistake. Because Python-
ast.c is auto-generated and shouldn't be counted here, the right
duplication rate of Python3.0 is very small (5%).
And I found the duplications are quite trivial, I wound not say that
all of them are acceptable, but certainly not a strong enough evident
for code quality.

I have made the same analysis to some commercial source code, the
dup60 rate is quite often significantly larger than 15%.


From google at mrabarnett.plus.com  Sat Feb  7 20:38:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 08 Feb 2009 01:38:44 +0000
Subject: Trouble with regular expressions
In-Reply-To: <686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>	<mailman.9049.1234017453.3487.python-list@python.org>	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>	<mailman.9068.1234048507.3487.python-list@python.org>
	<686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>
Message-ID: <498E37A4.5020400@mrabarnett.plus.com>

John Machin wrote:
> On Feb 8, 10:15 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> John Machin wrote:
>>> On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>>> LaundroMat wrote:
>>>>> Hi,
>>>>> I'm quite new to regular expressions, and I wonder if anyone here
>>>>> could help me out.
>>>>> I'm looking to split strings that ideally look like this: "Update: New
>>>>> item (Household)" into a group.
>>>>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
>>>>> ("Update", "New item", "(Household)")
>>>>> Some strings will look like this however: "Update: New item (item)
>>>>> (Household)". The expression above still does its job, as it returns
>>>>> ("Update", "New item (item)", "(Household)").
>>> Not quite true; it actually returns
>>>     ('Update:', ' New item (item) ', '(Household)')
>>> However ignoring the difference in whitespace, the OP's intention is
>>> clear. Yours returns
>>>     ('Update:', ' New item ', '(item) (Household)')
>> The OP said it works OK, which I took to mean that the OP was OK with
>> the extra whitespace, which can be easily stripped off. Close enough!
> 
> As I said, the whitespace difference [between what the OP said his
> regex did and what it actually does] is not the problem. The problem
> is that the OP's "works OK" included (item) in the 2nd group, whereas
> yours includes (item) in the 3rd group.
> 
Ugh, right again!

That just shows what happens when I try to post while debugging! :-)

>>>>> It does not work however when there is no text in parentheses (eg
>>>>> "Update: new item"). How can I get the expression to return a tuple
>>>>> such as ("Update:", "new item", None)?
>>>> You need to make the last group optional and also make the middle group
>>>> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
>>> Why do you perpetuate the redundant ^ anchor?
>> The OP didn't say whether search() or match() was being used. With the ^
>> it doesn't matter.
> 
> It *does* matter. re.search() is suboptimal; after failing at the
> first position, it's not smart enough to give up if the pattern has a
> front anchor.
> 
> [win32, 2.6.1]
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> *'x'" "assert not rx.match(txt)"
> 1000000 loops, best of 3: 1.17 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> 0*'x'" "assert not rx.match(txt)"
> 1000000 loops, best of 3: 1.17 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> *'x'" "assert not rx.search(txt)"
> 100000 loops, best of 3: 4.37 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> 0*'x'" "assert not rx.search(txt)"
> 10000 loops, best of 3: 34.1 usec per loop
> 
> Corresponding figures for 3.0 are 1.02, 1.02, 3.99, and 32.9
> 
On my PC the numbers for Python 2.6 are:

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.02 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.04 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.search(txt)"
100000 loops, best of 3: 3.69 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.search(txt)"
10000 loops, best of 3: 28.6 usec per loop

I'm currently working on the re module and I've fixed that problem:

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.28 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.23 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.search(txt)"
1000000 loops, best of 3: 1.21 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.search(txt)"
1000000 loops, best of 3: 1.21 usec per loop

Hmm. Needs more tweaking...


From yantao at telus.com  Sat Feb  7 20:46:15 2009
From: yantao at telus.com (Peter Pei)
Date: Sun, 08 Feb 2009 01:46:15 GMT
Subject: sortable table in python 3.0
Message-ID: <HPqjl.10476$Db2.10474@edtnps83>

In one of my program, I used something called MultiColumnList, which is one 
of the sortable table widgets done in python. However 3.0 sort is different. 
I googled and found couple of other implementations, but all in python 
3.0 -.

Does anyone know any solution in 3.0? or anything that has already been 
upgraded to 3.0? Thanks. 



From vincent at vincentdavis.net  Sat Feb  7 21:39:36 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 7 Feb 2009 19:39:36 -0700
Subject: simple web app, where to start
In-Reply-To: <20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
	<20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
Message-ID: <77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>

Thanks http://www.cherrypy.org/ looks like a good and simple option.
Thanks
Vincent Davis



On Sat, Feb 7, 2009 at 5:09 PM, <nick at stinemates.org> wrote:

> On Fri, Feb 06, 2009 at 09:16:02PM -0700, Vincent Davis wrote:
> > I have a simple script that takes a few input values and returns a csv
> file
> > and a few stats. If I wanted to host this on the web how would I. I have
> no
> > idea where to begin. If someone could point me in the right direction
> like
> > maybe a tutorial, tools I will need, functions..... I would appreciate
> it.I
> > know a little html but am not sure how to integrate python or know what
> > servers will handle it .....
> >
> > Thanks
> > Vincent Davis
>
> I'd suggest CherryPy[1]. It's fairly welcoming to newbies, because the
> web server and the framework and bundled together.
>
> 1: http://www.cherrypy.org/
>
> HTH,
> Nick
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From vincent at vincentdavis.net  Sat Feb  7 21:45:10 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 7 Feb 2009 19:45:10 -0700
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
Message-ID: <77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>

There is a option menu in idle but you may not be able to see it.
Try launching idle via terminal. For me it was located
/Library/Frameworks/Python/Versions/Current/bin/idle2.5
When I did this I had the option menu, I guess this is a known bug. I assume
there is a font option once you get the menu.

Vincent Davis



On Sat, Feb 7, 2009 at 4:03 PM, <chohazel at gmail.com> wrote:

> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.
> Thanks.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From wuwei23 at gmail.com  Sat Feb  7 22:15:28 2009
From: wuwei23 at gmail.com (alex23)
Date: Sat, 7 Feb 2009 19:15:28 -0800 (PST)
Subject: Python on TV-centric platforms
References: <mailman.9069.1234048986.3487.python-list@python.org>
Message-ID: <f3ccc0d9-9208-4d13-b304-bff21c48ffc8@y23g2000pre.googlegroups.com>

On Feb 8, 9:23?am, Vitaliy Yermolenko <vital... at gmail.com> wrote:
> Any chance to see Python to be ready for "Widget Development Kit (WDK)
> to third-party developers to create applications and services for
> viewing on TVs [...]

The excellent XBMC[1] has had Python support for years.

1: http://xbmc.org/


From rantingrick at gmail.com  Sat Feb  7 22:58:41 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 7 Feb 2009 19:58:41 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
Message-ID: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>

I want to build a 3D CAD visualization program with Python. Now before
you say this is not possible with Python here me out :)

I know OpenGL is probably my best bet BUT i want something a little
higher level than that. I am not ready for OpenGL yet.  I would like a
kit that is just above OpenGL and abstracts away all the finer
details, but not too much higher. VPython is a great kit but it is way
too high level for what i want. Here is a list of kits i am currently
looking at so if anybody can offer suggestions i would very much like
the information. Most of these are dedicated game engines but this is
all i can find

Panda 3D
OGRE
Soya 3D
VTK
Cystal Space
CG Kit
SciPy

Thanks Guy's


From rNOSPAMon at flownet.com  Sun Feb  8 02:08:29 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Sat, 07 Feb 2009 23:08:29 -0800
Subject: WebError documentation?
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
	<rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
	<498de947$0$24412$426a74cc@news.free.fr>
Message-ID: <rNOSPAMon-F8B8C9.23082907022009@news.gha.chartermi.net>

In article <498de947$0$24412$426a74cc at news.free.fr>,
 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr> wrote:

> Ron Garret a ?crit :
> > In article <mailman.9037.1233981452.3487.python-list at python.org>,
> >  Chris Rebert <clp2 at rebertia.com> wrote:
> > 
> >> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> >>> Is there any?  Where is it?  Extensive Googling has proven fruitless.
> >> It's not a standard Python exception. A third-party library you're
> >> using must be raising it. Check the exception traceback.
> > 
> > I see I did not make myself clear.
> 
> Now *that* is an understatement...
> 
>  >  I meant the Python software package
> > called "weberror", not a generic web error.
> > 
> > http://pypi.python.org/pypi/WebError
> 
> Google is your friend:
> http://bel-epa.com/docs/thirdparty/weberror/

Thanks!

rg


From henryar2 at gmail.com  Sun Feb  8 04:10:12 2009
From: henryar2 at gmail.com (Henry Read)
Date: Sun, 8 Feb 2009 17:10:12 +0800
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
Message-ID: <fb2218ba0902080110g2ee04900we1dd1515ac30040d@mail.gmail.com>

I don't think code duplication rate has strong relationship towards code
quality.

On Sun, Feb 8, 2009 at 9:12 AM, Terry <terry.yinzhe at gmail.com> wrote:

> On 2?8?, ??8?51?, Terry <terry.yin... at gmail.com> wrote:
> > On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
> >
> > > Terry <terry.yinzhe <at> gmail.com> writes:
> >
> > > > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > > > Do you by any chance have a few examples of these? There is a lot
> of
> > > > > idiomatic code in python to e.g. acquire and release the GIL or
> doing
> > > > > refcount-stuff. If that happens to be done with rather generic
> names as
> > > > > arguments, I can well imagine that as being the cause.
> > > > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
> >
> > > This isn't really fair because Python-ast.c is auto generated. ;)
> >
> > Oops! I don't know that! Then the analysis will not be valid, since
> > too many duplications are from there.
>
> Hey!
>
> I have to say sorry because I found I made a mistake. Because Python-
> ast.c is auto-generated and shouldn't be counted here, the right
> duplication rate of Python3.0 is very small (5%).
> And I found the duplications are quite trivial, I wound not say that
> all of them are acceptable, but certainly not a strong enough evident
> for code quality.
>
> I have made the same analysis to some commercial source code, the
> dup60 rate is quite often significantly larger than 15%.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From zaheer.agadi at gmail.com  Sun Feb  8 05:38:33 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 8 Feb 2009 02:38:33 -0800 (PST)
Subject: Internal Server error
Message-ID: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>

HI
I am getting an internal server error while trying get response from a
server following is my code


   def getDetails(self,username,password):
    urllib = urllib2.Request
    idurl="https://some.server.com/"
    port=8181
    conn = httplib.HTTPSConnection("some.server.com/",8181);
    conn.debuglevel  = 1
    username = "userone"
    password = "aaaa"
    Auth = "Basic" + ecnodeURL(self,username, password)
    url= "https://some.network.com:8181/main/folder/persons/" +
username + "/attributes/atrone"
    print url
    headers = {"Authorization": Auth,"Accept": "application/json"}
    conn.request("GET", url,{},headers)
    response = conn.getresponse()
    data = response.read()
    print response.reason
    print response.


What I am getting as response

https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
C:\Python26\lib\site-packages\httplib2\__init__.py:29:
DeprecationWarning: the md5 module is deprecated; use hashlib instead
  import md5
C:\Python26\lib\site-packages\httplib2\__init__.py:44:
DeprecationWarning: the sha module is deprecated; use the hashlib
module instead
  import sha
send: 'GET https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
\nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
\r\n\r\n'
reply: 'HTTP/1.1 500 Internal Server Error\r\n'
header: Content-Type: text/html
header: Content-Language:
header: Content-Length: 1299
header: Date: Sun, 08 Feb 2009 10:25:52 GMT
header: Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
Java System Application Server 9.1_02 - Error report</title><style
type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
family:Tahoma,Arial,sans-serif;color:white;background-
color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
{font-family:Tahoma,Arial,sans-serif;color:white;background-
color:#525D76;} P {font-family:Tahoma,Arial,sans-
serif;background:white;color:black;font-size:12px;}A {color : black;}
HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
p><p><b>description</b>The server encountered an internal error ()
that prevented it from fulfilling this request.</p><p><b>exception</b>
<pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
full stack traces of the exception and its root causes are available
in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
><h3>Sun Java System Application Server 9.1_02</h3></body></html>
Internal Server Error
<httplib.HTTPResponse instance at 0x00B9CDA0>


Thanks alot


From bblais at bryant.edu  Sun Feb  8 05:42:28 2009
From: bblais at bryant.edu (Brian Blais)
Date: Sun, 8 Feb 2009 05:42:28 -0500
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
	<77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>
Message-ID: <01AD6DB2-2750-43CC-AD2B-BA798A11BA48@bryant.edu>

Hello,

> On Sat, Feb 7, 2009 at 4:03 PM, <chohazel at gmail.com> wrote:
> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.

It is indeed a bug that the options menu doesn't show. What I did was  
to manually edit the file:

/Library/Frameworks/Python.framework/Versions/Current/lib/python2.5/ 
idlelib/config-main.def


to include the lines:

font= monaco
font-size= 13
font-bold= 0

(can't remember what the default was).


			bb


-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From deets at nospam.web.de  Sun Feb  8 06:09:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 12:09:49 +0100
Subject: Internal Server error
In-Reply-To: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
Message-ID: <6v7srtFil09hU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com schrieb:
> HI
> I am getting an internal server error while trying get response from a
> server following is my code
> 
> 
>    def getDetails(self,username,password):
>     urllib = urllib2.Request
>     idurl="https://some.server.com/"
>     port=8181
>     conn = httplib.HTTPSConnection("some.server.com/",8181);
>     conn.debuglevel  = 1
>     username = "userone"
>     password = "aaaa"
>     Auth = "Basic" + ecnodeURL(self,username, password)
>     url= "https://some.network.com:8181/main/folder/persons/" +
> username + "/attributes/atrone"
>     print url
>     headers = {"Authorization": Auth,"Accept": "application/json"}
>     conn.request("GET", url,{},headers)
>     response = conn.getresponse()
>     data = response.read()
>     print response.reason
>     print response.
> 
> 
> What I am getting as response
> 
> https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
> C:\Python26\lib\site-packages\httplib2\__init__.py:29:
> DeprecationWarning: the md5 module is deprecated; use hashlib instead
>   import md5
> C:\Python26\lib\site-packages\httplib2\__init__.py:44:
> DeprecationWarning: the sha module is deprecated; use the hashlib
> module instead
>   import sha
> send: 'GET https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
> HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
> \nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
> \r\n\r\n'
> reply: 'HTTP/1.1 500 Internal Server Error\r\n'
> header: Content-Type: text/html
> header: Content-Language:
> header: Content-Length: 1299
> header: Date: Sun, 08 Feb 2009 10:25:52 GMT
> header: Connection: close
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
> www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
> Java System Application Server 9.1_02 - Error report</title><style
> type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
> serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
> family:Tahoma,Arial,sans-serif;color:white;background-
> color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
> serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
> family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
> {font-family:Tahoma,Arial,sans-serif;color:white;background-
> color:#525D76;} P {font-family:Tahoma,Arial,sans-
> serif;background:white;color:black;font-size:12px;}A {color : black;}
> HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
> h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
> p><p><b>description</b>The server encountered an internal error ()
> that prevented it from fulfilling this request.</p><p><b>exception</b>
> <pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
> full stack traces of the exception and its root causes are available
> in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
>> <h3>Sun Java System Application Server 9.1_02</h3></body></html>
> Internal Server Error
> <httplib.HTTPResponse instance at 0x00B9CDA0>

What do you expect us to do about this? That has nothing todo with 
python, what you do is that you don't speak the right way with the 
server in question, producing a stacktrace. But nobody here knows *how* 
to talk to that machine. O

Diez


From mail at joaomoreno.com  Sun Feb  8 06:18:05 2009
From: mail at joaomoreno.com (mail at joaomoreno.com)
Date: Sun, 8 Feb 2009 03:18:05 -0800 (PST)
Subject: BaseHTTPRequestHandler freezes while writing to self.wfile after 
	installing Python 3.0
References: <ffdee1a1-109a-4bfa-a1ec-5717cfbcaf44@u14g2000yqg.googlegroups.com>
Message-ID: <a96b3d30-6074-4d1c-b5d4-567f002f7ca1@41g2000yqf.googlegroups.com>

On Feb 7, 3:55?pm, m... at joaomoreno.com wrote:
> Hey guys,
>
> I'm starting to lose my head with this one.
>
> I have a class that extends BaseHTTPRequestHandler. It works fine on
> Python 2.5. And yesterday I was curious and decided to install Python
> 3.0 on my Mac (I followed this tutorial, to be sure I wasn't messing
> things up:http://farmdev.com/thoughts/66/python-3-0-on-mac-os-x-alongside-2-6-2...
> ). I tried my application on Python 3.0 and the code just freezed on
> this line:
>
> self.wfile.write(f.read())
>
> I searched and got to this bughttp://bugs.python.org/issue3826. I
> couldn't understand if there's already a fix for that. But, the
> strangest thing was that, when I tried my application on 2.5, it
> started freezing on the same spot! I then removed everything I
> installed from 3.0, fixed the paths, and it still gives me the error.
> I don't know what else to do.
>
> The app works fine on 2.5, because I tried it on another computer.
>
> Thanks for your help.

I'm sorry, it seems to have been a weird setting between routers (mac
<-> router <-> router <-> ISP) here at home.

Small files ( < 100kB ) were served with no problem at all, but larger
files got stuck. I found it out after formatting my mac, and realized
that it was still happening. I tried to remove on of the routers out
of the way and it sure works now. The real reason that caused it, and
why it worked before and suddently stopped working after
(coincidently, for sure) installing Python 3.0 is still incognito for
me.


From zaheer.agadi at gmail.com  Sun Feb  8 06:20:09 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 8 Feb 2009 03:20:09 -0800 (PST)
Subject: Internal Server error
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
	<6v7srtFil09hU1@mid.uni-berlin.de>
Message-ID: <4cb170df-2786-42fe-97e5-f243ce6401b0@o2g2000prl.googlegroups.com>

On Feb 8, 4:09?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> zaheer.ag... at gmail.com schrieb:
>
>
>
> > HI
> > I am getting an internal server error while trying get response from a
> > server following is my code
>
> > ? ?def getDetails(self,username,password):
> > ? ? urllib = urllib2.Request
> > ? ? idurl="https://some.server.com/"
> > ? ? port=8181
> > ? ? conn = httplib.HTTPSConnection("some.server.com/",8181);
> > ? ? conn.debuglevel ?= 1
> > ? ? username = "userone"
> > ? ? password = "aaaa"
> > ? ? Auth = "Basic" + ecnodeURL(self,username, password)
> > ? ? url= "https://some.network.com:8181/main/folder/persons/" +
> > username + "/attributes/atrone"
> > ? ? print url
> > ? ? headers = {"Authorization": Auth,"Accept": "application/json"}
> > ? ? conn.request("GET", url,{},headers)
> > ? ? response = conn.getresponse()
> > ? ? data = response.read()
> > ? ? print response.reason
> > ? ? print response.
>
> > What I am getting as response
>
> >https://some.server.com:8181/main/folder/persons/userone/attributes/a...
> > C:\Python26\lib\site-packages\httplib2\__init__.py:29:
> > DeprecationWarning: the md5 module is deprecated; use hashlib instead
> > ? import md5
> > C:\Python26\lib\site-packages\httplib2\__init__.py:44:
> > DeprecationWarning: the sha module is deprecated; use the hashlib
> > module instead
> > ? import sha
> > send: 'GEThttps://some.server.com:8181/main/folder/persons/userone/attributes/a...
> > HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
> > \nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
> > \r\n\r\n'
> > reply: 'HTTP/1.1 500 Internal Server Error\r\n'
> > header: Content-Type: text/html
> > header: Content-Language:
> > header: Content-Length: 1299
> > header: Date: Sun, 08 Feb 2009 10:25:52 GMT
> > header: Connection: close
> > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
> >www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
> > Java System Application Server 9.1_02 - Error report</title><style
> > type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
> > serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
> > family:Tahoma,Arial,sans-serif;color:white;background-
> > color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
> > serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
> > family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
> > {font-family:Tahoma,Arial,sans-serif;color:white;background-
> > color:#525D76;} P {font-family:Tahoma,Arial,sans-
> > serif;background:white;color:black;font-size:12px;}A {color : black;}
> > HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
> > h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
> > p><p><b>description</b>The server encountered an internal error ()
> > that prevented it from fulfilling this request.</p><p><b>exception</b>
> > <pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
> > full stack traces of the exception and its root causes are available
> > in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
> >> <h3>Sun Java System Application Server 9.1_02</h3></body></html>
> > Internal Server Error
> > <httplib.HTTPResponse instance at 0x00B9CDA0>
>
> What do you expect us to do about this? That has nothing todo with
> python, what you do is that you don't speak the right way with the
> server in question, producing a stacktrace. But nobody here knows *how*
> to talk to that machine. O
>
> Diez

Thanks,

I know there is something on the wrong side, when it says
java.util.NoSuchElementException i  thought something wrong with
setting values I just wanted you guys to point me out  there is
something wrong with the code I have written I am not very familiar
with Python the same work for java works fine.

I wanted to know if I am setting the headers correctly, getting the
response correctly
are there any better ways of encoding the url Over all Does the code
look ok...?


From jstroud at mbi.ucla.edu  Sun Feb  8 06:27:37 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 08 Feb 2009 03:27:37 -0800
Subject: TkInter: Problem with propagation of resize events through
	geometry manager hierarchy?
In-Reply-To: <mailman.9067.1234047013.3487.python-list@python.org>
References: <mailman.9067.1234047013.3487.python-list@python.org>
Message-ID: <Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>

Randy Smith wrote:
> The cropping and scrolling works fine.  But when I try to add
> responding to resize events, I get into trouble.  Specifically:
> * When I naively change the size of the image shown to be borderwidth
>   less than the size indicated in the configure event, the size of the
>   image shown grows gradually but inexorably when I start the test
>   app.  (Sorta scary, actually :-})
> * When I fiddle a bit to figure out what the actual difference in size
>   is between the Configure event and the image that can be displayed,
>   I get a vibrating, jagged display of the image.
> 
> Investigation suggests that multiple configure events are hitting the
> label in response to each user resize with different sizes.  I'm
> guessing that when I resize the image in response to those different
> events, that creates new resize events propagating through the window
> manager hierarchy, which creates new configure events, which means my
> handler changes the image size, which ... you get the idea.

I can't test your code because I don't have the test image and for some 
reason it does not recognize a tiff of my own. But, just glancing at 
your code, it looks like a quick-fix would be to set self.zoom to a 
sentinel at the end of refresh() and return 'break' at the top of the 
methods that use self.zoom if it is said sentinel value (e.g. "if 
self.zoom == WHATEVER_SENTINEL: return 'break'). You may also want to 
return 'break' for event responders that should terminate the event 
chain. This is a general technique to stop a lot of unwanted event 
propagation.

James


-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From nytrokiss at gmail.com  Sun Feb  8 06:53:07 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 8 Feb 2009 13:53:07 +0200
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <8a6b8e350902080353s51fc9d1bmc9b5e56f79509a7d@mail.gmail.com>

I use Django for all simple apps and it works great!

On Sat, Feb 7, 2009 at 6:16 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.I know a little html but am not sure how to integrate python or know what
> servers will handle it .....
>
> Thanks
> Vincent Davis
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From geert.discussions at gmail.com  Sun Feb  8 07:07:40 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Sun, 08 Feb 2009 13:07:40 +0100
Subject: Path question
In-Reply-To: <6urjrhFgvif8U1@mid.uni-berlin.de>
References: <mailman.8716.1233686855.3487.python-list@python.org>
	<6urjrhFgvif8U1@mid.uni-berlin.de>
Message-ID: <498ECB0C.5050705@gmail.com>

Diez B. Roggisch wrote:
> Geert Vancompernolle schrieb:
>> Hi,
>>
>> I have the following path construction:
>>
>> ./src/__init__.py
>>     /main.py
>>     /modules/__init__.py
>>             /application.py
>>     /ui/__init__.py
>>        /mainwindow/__init__.py
>>                   /mainwindow.py
>>
>> Now I want to call the method 'MainWindow' in the module 
>> 'mainwindow', from the module 'application'.
>>
>> I'm having the following import statement in 'applications.py':
>>
>> from .. ui.mainwindow.mainwindow import MainWindow
>>
>> That doesn't work.  I've also tried many other combinations like from 
>> ..ui.mainwindow...  but none of them work.
>>
>> I always get the following error:
>>
>> "Attempted relative import beyond toplevel package"
>>
>> How can I import the method 'MainWindow' from 'mainwindow' into 
>> 'application', using the explicit relative import rules?
>>
>> Or is there a better way to do this?
>>  
>
> Rename "src" to "myapp", and start main.py from above that. That 
> should work.
>
>
>
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>
That trick did it, thanks!

But I have one more unclarity about relative import rules.  Here 
<http://docs.python.org/tutorial/modules.html?highlight=modules>, one 
can find an explanation about modules in the official Python 2.6.1 
documentation.

In that article, there's an example of importing relative packages (in 
the section "Packages").

I see the following examples:

from . import echo
from .. import formats
from ..filters import equalizer


Applying that mechanism on my application, I'm using the following construction (see my initial email):

"from .. ui.mainwindow.mainwindow import MainWindow"

But using "from ..ui.mainwindow.mainwindow import MainWindow" seems to be giving exactly the same result (mind the lacking space between ".." and "ui").

So, what's the difference (if there is one) between "from .. ui.mainwin..." and "from ..ui.mainwin..." (again, mind the difference in space)?

I guess there's a difference, otherwise it would not be given as an example in the Python documentation.  But then, why is the application (at first sight) behaving the same and also working fine?


-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From gil.shinar at gmail.com  Sun Feb  8 07:22:25 2009
From: gil.shinar at gmail.com (gil.shinar at gmail.com)
Date: Sun, 8 Feb 2009 04:22:25 -0800 (PST)
Subject: Process crash with no reason
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
Message-ID: <6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>

On Jan 28, 7:37?pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Jan 28, 2009, at 12:12 PM, gil.shi... at gmail.com wrote:
>
> > On Jan 27, 5:59 pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> >> On Jan 27, 2009, at 10:34 AM, gil.shi... at gmail.com wrote:
> >>> On Jan 27, 2:10 pm, Tim Golden <m... at timgolden.me.uk> wrote:
> >>>> Then how are you interacting with Sybase?
>
> >>> I'm using python's functions to run sybase sql commands.
>
> >> Can you give a short code sample? I'm unaware of how one would use ?
> >> the
> >> standard Python library to talk to Sybase, unless Sybase has a raw
> >> socket interface or some such.
>
> > First of all I have found the following python's import:
>
> > import Sybase
>
> This isn't part of the Python standard library. It's a 3rd party ?
> module -- exactly what we were looking for.
>
> Personally, I think this (or another C++ or C-based 3rd party module ?
> that you use heavily) is your prime suspect for the origin of the ?
> crashes you're having. That's not because I think the people who wrote ?
> or maintain it are bad or lazy coders. In fact, it's no reflection on ?
> their skill at all. It's just that a lot more people have used and ?
> exercised the Python standard library modules. A 3rd party module like ?
> this one will be less well-used and therefore less well-tested and ?
> therefore more likely to contain a bug that causes a crash.
>
> That said, I don't know how to advise you to proceed from here. You ?
> could perhaps turn on logging at the database level. I know Postgres, ?
> for instance, can write very detailed logs and so if you get a crash ?
> at 9:33:22 you can look in the log and see what was happening at that ?
> time. If you get several crashes and they all happen when a certain ?
> SQL statement is being executed, that's probably the culprit.
>
> You could also alter the Sybase module to add logging using Python's ?
> logging module. Who knows, it might already be there, waiting to be ?
> turned on with a switch.
>
> But I'm jumping the gun a little. As I said, it could be this module ?
> or another that's causing your problem. It's a lot easier to cause a ?
> hard crash using C or C++ than it is using pure Python, so pure Python ?
> modules would be lower on my list of suspects. Enumerate all of the ?
> modules you're using and find out where they come from. Any of them ?
> that are not in the standard library and are not written in pure ?
> Python should top your list of suspects.
>
> Good luck
> Philip

Thanks a lot and sorry for the late response. My main suspect is the
CherryPy.
I'm still investigating it.

Gil


From loredana.pier at gmail.com  Sun Feb  8 07:46:43 2009
From: loredana.pier at gmail.com (loredana.pier at gmail.com)
Date: Sun, 8 Feb 2009 04:46:43 -0800 (PST)
Subject: The fastest way  to convert a long list of date
Message-ID: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>

If I want to convert a single date format I can do:

import datetime, dateutil.parser
d = dateutil.parser.parse('2008-09-26)
print d.strftime('%A %d, %b %y' )

but if I want convert a long list of time how can do it in the fastest
way?
for example:
from ['2008-09-26?, '2008-09-28?, '2008-09-29?,.............]
to [?26 sep?,?28 sep?,?29 sep?,................]

Thank you

Loredana


From Pat at junk.net  Sun Feb  8 07:51:32 2009
From: Pat at junk.net (Pat)
Date: Sun, 08 Feb 2009 07:51:32 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de>	<gmc979$b9r$1@aioe.org>
	<mailman.8795.1233773421.3487.python-list@python.org>
Message-ID: <gmmkfg$pcf$1@aioe.org>

Gabriel Genellina wrote:
> En Wed, 04 Feb 2009 12:38:04 -0200, Pat <Pat at junk.net> escribi?:
>> Andreas Waldenburger wrote:
>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>> Tobiah wrote:
>>>>> Just out of curiosity, why was len() made to
>>>>> be it's own function?  I often find myself
>>>>> typing things like my_list.len before I
>>>>> catch myself.
> 
>>>> I'm surprised that no one responded to that question.
>>>>
>>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>>> Might it be that your newsserver is a bit laggy?
>>
>> Might be laggy.  Who knows.
>> Why didn't you answer the len() question?
> 
> Why should he? Why didn't you look for the answer yourself, after being 
> told that it existed? Why do you expect *us* to repeat ourselves again 
> and again? Don't be so lazy...
> 

Why do *us* feel obligated to respond?  Is there a gun pointed at your 
heads forcing to giving a bellicose responses?

Who is this *us*?  A secret society?  An exclusive club?

New rule:  If you don't like a question or a post, simply ignore it.  We 
don't enjoy your snarky repartee.


From Pat at junk.net  Sun Feb  8 07:54:13 2009
From: Pat at junk.net (Pat)
Date: Sun, 08 Feb 2009 07:54:13 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>	<gmc979$b9r$1@aioe.org>
	<mailman.8798.1233774905.3487.python-list@python.org>
Message-ID: <gmmkkh$pcf$2@aioe.org>

Terry Reedy wrote:
> Pat wrote:
>> Andreas Waldenburger wrote:
>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>
>>>> Tobiah wrote:
>>>>> Just out of curiosity, why was len() made to
>>>>> be it's own function?  I often find myself
>>>>> typing things like my_list.len before I
>>>>> catch myself.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Toby
>>>> I'm surprised that no one responded to that question.
>>>>
>>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>>> Might it be that your newsserver is a bit laggy?
>>>
>>> regards
>>> /W
>>>
>>
>> Might be laggy.  Who knows.
>>
>> Why didn't you answer the len() question?
> 
> I didn't respond because it has been asked and answered before, so the 
> answer can be found in the google archives or even maybe the FAQ.

Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?

If you didn't feel like answering the question, why did you add an 
utterly worthless post?



From clp2 at rebertia.com  Sun Feb  8 08:05:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 05:05:33 -0800
Subject: The fastest way to convert a long list of date
In-Reply-To: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902080505x419ce59eq9db1a0df6381bdbc@mail.gmail.com>

On Sun, Feb 8, 2009 at 4:46 AM,  <loredana.pier at gmail.com> wrote:
> If I want to convert a single date format I can do:
>
> import datetime, dateutil.parser
> d = dateutil.parser.parse('2008-09-26)
> print d.strftime('%A %d, %b %y' )
>
> but if I want convert a long list of time how can do it in the fastest
> way?
> for example:
> from ['2008-09-26', '2008-09-28', '2008-09-29',.............]
> to ['26 sep','28 sep','29 sep',................]

import datetime
from dateutil.parser import parse
orig_dates = ['2008-09-26', '2008-09-28', ...]#etc
converted_dates = [parse(datestr).strftime('%A %d, %b %y' ) for
datestr in orig_dates]

Or if an iterator would be okay instead of a list, you can substitute
the list comprehension for itertools.imap():

#setup same as before
from itertools import imap
converted_dates = imap(lambda datestr: parse(datestr).strftime('%A %d,
%b %y' ), orig_dates)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From peke at iki.fi  Sun Feb  8 08:20:00 2009
From: peke at iki.fi (=?ISO-8859-1?Q?Pekka_Kl=E4rck?=)
Date: Sun, 8 Feb 2009 15:20:00 +0200
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <7dedbb6d0902080520i52f2ffcenb52f53ed3b0277e2@mail.gmail.com>

2009/2/6 Ken Elkabany <Ken at elkabany.com>:
>
> I am attempting to fully-simulate an 'int' object with a custom object type.
> It is part of a library I am creating for python futures and promises. Is
> there anyway such that type(my_object) can return <type 'int'>?

If it's enough to change how the type looks like you can simply change its repr:

>>> class X(type):
...   def __repr__(self):
...     return 'xxx'
...
>>> class Y(object):
...   __metaclass__ = X
...
>>> type(Y())
xxx


Cheers,
    .peke


From digitig at gmail.com  Sun Feb  8 08:24:12 2009
From: digitig at gmail.com (Tim Rowe)
Date: Sun, 8 Feb 2009 13:24:12 +0000
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
	<e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>
Message-ID: <aee48b3c0902080524k49f48a40kff1e9ccf9386c4cd@mail.gmail.com>

2009/2/7 andrew cooke <andrew at acooke.org>:
>
> there's a justification for this awful mess here -
> http://mail.python.org/pipermail/python-3000/2006-March/000104.html
>
> i didn't know about this, and even after reading steven's broken (i
> assume) example, managed to get it backwards.

What's awful about it? Except in the sense of inspiring awe, of
course. No, Steven's example isn't broken, it works as the epydoc
authors intended.

> (it's still in 3).

Good.

--
Tim Rowe


From Ron.Barak at lsi.com  Sun Feb  8 08:36:17 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 8 Feb 2009 13:36:17 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <mailman.41126.1234094855.3486.python-list@python.org>
References: <mailman.41126.1234094855.3486.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>

Hi,

I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
I do not need the cStringIO.StringO in the target object.
The target instance is to be pickled.

Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.

However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()

Is there a way to create a copy of the instance, sans the cStringIO.StringO ?

If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).

Can you suggest a better way ?

Thanks,
Ron.

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 388, in <module>
    for_pickle_log_stream = copy.deepcopy(log_stream)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 291, in _deepcopy_inst
    state = deepcopy(state, memo)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 254, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "c:\Python25\lib\copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "c:\Python25\lib\copy.py", line 322, in _reconstruct
    y = callable(*args)
  File "c:\Python25\lib\copy_reg.py", line 92, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
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From bblais at bryant.edu  Sun Feb  8 08:36:36 2009
From: bblais at bryant.edu (Brian Blais)
Date: Sun, 8 Feb 2009 08:36:36 -0500
Subject: simple web app, where to start
In-Reply-To: <77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
	<20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
	<77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>
Message-ID: <937E51FC-44E0-4268-9FF3-961B8ECBECF9@bryant.edu>

On Feb 7, 2009, at 21:39 , Vincent Davis wrote:

> Thanks http://www.cherrypy.org/ looks like a good and simple option.
>

it is a nice option, but I prefer www.webpy.org over cherrypy.  It's  
a bit easier, and there is less magic.  I've done really simple  
scripts, to semi-complex web apps with it.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From __peter__ at web.de  Sun Feb  8 08:52:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 08 Feb 2009 14:52:27 +0100
Subject: The fastest way  to convert a long list of date
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
Message-ID: <gmmo2r$u3m$02$1@news.t-online.com>

loredana.pier at gmail.com wrote:

> If I want to convert a single date format I can do:
> 
> import datetime, dateutil.parser
> d = dateutil.parser.parse('2008-09-26)
> print d.strftime('%A %d, %b %y' )
> 
> but if I want convert a long list of time how can do it in the fastest
> way?
> for example:
> from ['2008-09-26?, '2008-09-28?, '2008-09-29?,.............]
> to [?26 sep?,?28 sep?,?29 sep?,................]

For large source lists the following should be quite fast...

months = "jan feb mar apr may jun jul aug sep oct dec".split()
lookup = dict(("%02d-%02d" % (mi+1, d), "%02d-%s" % (d, m)) for mi, m in
enumerate(months) for d in range(1, 32))

source = ["2008-09-26", "2008-09-28", "2008-09-29"]
print [lookup[d[-5:]] for d in source]


... but it is also very brittle. Various compromises are possible, but to
find the best would require that you tell us a bit more about your use
case. In my experience people are a bit too fast to demand "fast".

Peter


From lists at cheimes.de  Sun Feb  8 09:01:04 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 15:01:04 +0100
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
Message-ID: <gmmoj0$mlh$1@ger.gmane.org>

Barak, Ron schrieb:
> Hi,
> 
> I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> I do not need the cStringIO.StringO in the target object.
> The target instance is to be pickled.
> 
> Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
> 
> However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
> 
> Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
> 
> If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
> 
> Can you suggest a better way ?

You can overwrite some functions in order to omit attributes from a
pickle. It's all documented at
http://docs.python.org/library/pickle.html#pickling-and-unpickling-normal-class-instances

Christian



From hall.jeff at gmail.com  Sun Feb  8 09:04:29 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Sun, 8 Feb 2009 06:04:29 -0800 (PST)
Subject: easy_install
Message-ID: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>

For the life of me I can not figure out how to get easy_install to
work. The syntax displayed on the web page does not appear to work
properly.

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

Is there a simpler way to install a python egg? Or am I missing
something with easy_install?


From detlev at die-offenbachs.de  Sun Feb  8 09:05:08 2009
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Sun, 08 Feb 2009 15:05:08 +0100
Subject: ANN: eric 4.3.0 released
Message-ID: <gmmoqk$qdu$2@online.de>

Hi,

this is to inform all of you about the immediate availability of the long
awaited 4.3.0 release. It includes enhancements in nearly every area.
Please see for yourself by downloading it from 

http://eric-ide.python-projects.org/index.html

eric4 is a Python (and Ruby) IDE written using PyQt4 and QScintilla2. It
comes with batteries included and is extensible via a built-in plug-in
system. Plug-ins are available via the internet from the eric4 plugin
repository. Please see the a.m. web site for more details.

Regards,
Detlev
-- 
Detlev Offenbach
detlev at die-offenbachs.de


From elsjaako at gmail.com  Sun Feb  8 09:11:36 2009
From: elsjaako at gmail.com (elsjaako)
Date: Sun, 8 Feb 2009 06:11:36 -0800 (PST)
Subject: receive and react to MIDI input
References: <9bb30fb9-c929-4296-84c6-9ebc4932157f@i24g2000prf.googlegroups.com>
Message-ID: <46da09d0-4392-43ce-b3e6-b962c82de371@x10g2000yqk.googlegroups.com>

On Jan 29, 8:33?pm, elsjaako <elsja... at gmail.com> wrote:
> Hi all. I want to write an application that reads midi notes and then
> does something (specifically, play sound files, but that doesn't
> really matter for this question). I'm on windows.
>
> Bart de Waal

I got it working, quickly packed it up, and posted it to sourceforge.
See http://sourceforge.net/projects/winpymidiin/.


From deets at nospam.web.de  Sun Feb  8 09:27:22 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 15:27:22 +0100
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
Message-ID: <6v88eaFifbroU1@mid.uni-berlin.de>

hall.jeff at gmail.com wrote:

> For the life of me I can not figure out how to get easy_install to
> work. The syntax displayed on the web page does not appear to work
> properly.
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

It usually works for me - so what does "not appear to work properly"
actually mean?

Diez


From deets at nospam.web.de  Sun Feb  8 09:45:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 15:45:33 +0100
Subject: Internal Server error
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
	<6v7srtFil09hU1@mid.uni-berlin.de>
	<4cb170df-2786-42fe-97e5-f243ce6401b0@o2g2000prl.googlegroups.com>
Message-ID: <6v89gdFiiagkU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com wrote:

> On Feb 8, 4:09?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> zaheer.ag... at gmail.com schrieb:
>>
>>
>>
>> > HI
>> > I am getting an internal server error while trying get response from a
>> > server following is my code
>>
>> > def getDetails(self,username,password):
>> > urllib = urllib2.Request
>> > idurl="https://some.server.com/"
>> > port=8181
>> > conn = httplib.HTTPSConnection("some.server.com/",8181);
>> > conn.debuglevel ?= 1
>> > username = "userone"
>> > password = "aaaa"
>> > Auth = "Basic" + ecnodeURL(self,username, password)
>> > url= "https://some.network.com:8181/main/folder/persons/" +
>> > username + "/attributes/atrone"
>> > print url
>> > headers = {"Authorization": Auth,"Accept": "application/json"}
>> > conn.request("GET", url,{},headers)
>> > response = conn.getresponse()
>> > data = response.read()
>> > print response.reason
>> > print response.

> Thanks,
> 
> I know there is something on the wrong side, when it says
> java.util.NoSuchElementException i  thought something wrong with
> setting values I just wanted you guys to point me out  there is
> something wrong with the code I have written I am not very familiar
> with Python the same work for java works fine.

Well, it's obviously not the same. Otherwise it *would* work fine as well.

your code is a bit non-idiomatic:

urllib = urllib2.Request

is *very* misleading, aliasing a class-constructor with a well-known
modulename.

Not using username & password also isn't really making sense.

"ecnodeURL" - what is that? Where does that come from - certainly not from
the stdlib, that's got a better spelling correction.

Instead of 

"string" + variable + "string"

on usually uses string interpolation to build complicated strings:

"some text %s some more text" % variable



> 
> I wanted to know if I am setting the headers correctly, getting the
> response correctly
> are there any better ways of encoding the url Over all Does the code
> look ok...?

You seem to make the call correctly. Just not what the server expects.

Diez



From davidgshi at yahoo.co.uk  Sun Feb  8 10:05:50 2009
From: davidgshi at yahoo.co.uk (David Shi)
Date: Sun, 8 Feb 2009 15:05:50 +0000 (GMT)
Subject: Dynamically updating sections of webpage
Message-ID: <851179.67701.qm@web26306.mail.ukl.yahoo.com>

I want to dynamically update sections of webpage, something like a div or table or frame.
?
Where can I find best examples/demos for this?? Preferably with a generic loader.
?
I would also like to find a best book on this.? It needs to be concise, well explained and can be applied universally.
?
Is there a book or reference like "Accelerated DOM Scripting with Ajax, APIs and Libraries and Python"?
?
Can anyone point me towards the right direction.? Please -- no over loaded websites.
?
I like to read Newtonian style of text!
?
Sincerely,
?
David


      
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From curiouserrandy at gmail.com  Sun Feb  8 10:08:11 2009
From: curiouserrandy at gmail.com (curiouserrandy at gmail.com)
Date: Sun, 8 Feb 2009 07:08:11 -0800 (PST)
Subject: TkInter: Problem with propagation of resize events through 
	geometry manager hierarchy?
References: <mailman.9067.1234047013.3487.python-list@python.org> 
	<Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>
Message-ID: <35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>

On Feb 8, 6:27?am, James Stroud <jstr... at mbi.ucla.edu> wrote:

> I can't test your code because I don't have the test image and for some
> reason it does not recognize a tiff of my own. But, just glancing at
> your code, it looks like a quick-fix would be to set self.zoom to a
> sentinel at the end of refresh() and return 'break' at the top of the
> methods that use self.zoom if it is said sentinel value (e.g. "if
> self.zoom == WHATEVER_SENTINEL: return 'break'). You may also want to
> return 'break' for event responders that should terminate the event
> chain. This is a general technique to stop a lot of unwanted event
> propagation.

Thanks!  I hadn't known about the "return 'break'" technique.  But
I don't follow your sentinel suggestion; how would that sentinel
ever get reset?  It seems as if the first time through the event
chain it'd be set to the sentinel, and the routines that pay
attention to it would never execute.  What am I missing?
I tried simply returning 'break' at the end of "refresh()" and
that made no change in behavior.

(Note that zoom should be constant at 1.0 for the life of
this program; I put it in because I'm planning to put in expansion/
contraction of images after I get resize & scrolling working
together.  Eliminating all multiplications by self.zoom confirms
this belief; no change in behavior).

One thing I've been looking for (including in the source :-J) is
a description of the precise process that the geometry manager
goes through in figuring out and then setting sizes for the
various widgets (on resize or, apparently, startup).  I suspect
with that + the "return 'break'" technique I could get this to
work.  But I haven't been having any luck finding that documentation.

If you'd like me to send you the test.tiff image, I'm happy to, but
it's nothing special; just a screen capture of a random google maps
satellite view that I use for testing.

                             -- Randy


>
> James
>
> --
> James Stroud
> UCLA-DOE Institute for Genomics and Proteomics
> Box 951570
> Los Angeles, CA 90095
>
> http://www.jamesstroud.com



From hall.jeff at gmail.com  Sun Feb  8 10:21:30 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Sun, 8 Feb 2009 07:21:30 -0800 (PST)
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
Message-ID: <4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>

On Feb 8, 9:27?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> hall.j... at gmail.com wrote:
> > For the life of me I can not figure out how to get easy_install to
> > work. The syntax displayed on the web page does not appear to work
> > properly.
>
> > easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
>
> It usually works for me - so what does "not appear to work properly"
> actually mean?
>
> Diez

http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-installing-a-package

seems to imply that after installation I can goto a command prompt and
type

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

I tried doing this in the python interpreter and on a straight "cmd"
command prompt (the site doesn't really specify). I also tried "import
easy_install" and then

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
easy_install ("c:\MySQL_python-1.2.2-py2.4-win32.egg")

and a couple other permutations and never got it to run (error
messages for the first group were "invalid syntax" and were various
flavors of "module not callable" for the second group).



From apt.shansen at gmail.com  Sun Feb  8 10:31:14 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 8 Feb 2009 07:31:14 -0800
Subject: Process crash with no reason
In-Reply-To: <6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
	<6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
Message-ID: <7a9c25c20902080731t616ea63diba1dff99d4a2779e@mail.gmail.com>

> Thanks a lot and sorry for the late response. My main suspect is the
> CherryPy.
> I'm still investigating it.

You're asking for advice but not listening to what people are saying
here -- why is CherryPy on the top of your list?

What version of CherryPy is it? 1 or 2?

If its 2, then its pure python and there's a really, really low chance
that its provoking a hard crash w/o a traceback printing before it
dies out. A hard crash which isn't printing an error message is
possible in pure Python I suppose, but I've never seen it. A "Bus
error" for example will kill the interpreter before it can do any
error handling. But I've only ever seen that when interfacing with
third party libraries.

If its 1, there is some C so you can bump it up ... and for that I'd
probably attempt to run the application in a console or with stdout
manually redirected instead of relying on the logging alone, to see if
anything useful gets put out.. like "Bus error", at the time it exits.

But why do you keep discarding the Sybase module?

Its most definitely *not* written in python. What Philip and Tim were
trying to tell you is you are *not* using "python's functions to run
sybase sql commands"

The Sybase module is a python wrapper around code written in C module
which is interfacing with a third party library to talk to Sybase. Are
you at the latest version of Sybase(0.39 if its the same module I'm
aware of?) How about the library underneath it? FreeTDS or Sybase ASE
(whatever that is) or whatever else is being used? A bug in /any/ of
those C layers (notice its *multiple* layers) could propagate up and
provoke a hard crash that Python doesn't catch. So if you look into
those versions perhaps one has a new release that fixes bugs.

--S


From duncan.booth at invalid.invalid  Sun Feb  8 10:34:03 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 8 Feb 2009 15:34:03 GMT
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
Message-ID: <Xns9BAC9E592D5Aduncanbooth@127.0.0.1>

hall.jeff at gmail.com wrote:

> http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-ins
> talling-a-package 
> 
> seems to imply that after installation I can goto a command prompt and
> type
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
> 
> I tried doing this in the python interpreter and on a straight "cmd"
> command prompt (the site doesn't really specify). 

Start a Windows command prompt. You probably don't have the directory 
containing easy_install on your path, so use the 'cd' command to change to 
the directory it was installed in: that will be the Scripts directory under 
the directory to which you installed Python. So since you seem to be using 
Python 2.4 that might be:

C:\>cd C:\Python24\Scripts

C:\Python24\Scripts>easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

Alternatively in a single command:

C:\>C:\Python24\Scripts\easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg



From xie.kenneth at gmail.com  Sun Feb  8 10:45:15 2009
From: xie.kenneth at gmail.com (Ken)
Date: Sun, 8 Feb 2009 23:45:15 +0800
Subject: Quetion about flags of socket.recv(bufsize, [flags])
Message-ID: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>

I want to receive 4 bytes from a connected socket, I code like this:

data = sock.recv(4)

There is a problem with above code. The recv method will not block until it
get all 4 bytes. So I use the second param of recv method like this

data = sock.recv(4, socket.MSG_WAITALL)

This works fine on linux with python 2.5, while on windows, the interpreter
tells me 'AttributeError: 'module' object has no attribute 'MSG_WAITALL''.
How can I work this out, or there is another way to get certain bytes from a
socket and block if it hasn't got enough bytes?

:)
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From steve at holdenweb.com  Sun Feb  8 11:09:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 11:09:15 -0500
Subject: Quetion about flags of socket.recv(bufsize, [flags])
In-Reply-To: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>
References: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>
Message-ID: <gmn03n$bcp$1@ger.gmane.org>

Ken wrote:
> I want to receive 4 bytes from a connected socket, I code like this:
> 
> data = sock.recv(4)
> 
> There is a problem with above code. The recv method will not block until
> it get all 4 bytes. So I use the second param of recv method like this
> 
> data = sock.recv(4, socket.MSG_WAITALL)
> 
> This works fine on linux with python 2.5, while on windows, the
> interpreter tells me 'AttributeError: 'module' object has no attribute
> 'MSG_WAITALL''.  How can I work this out, or there is another way to get
> certain bytes from a socket and block if it hasn't got enough bytes?
> 
If you *need* 4 bytes then the best way to receive them is simply to
loop until you get them (assuming you are using blocking sockets):

BLOCKSIZE = 4
buffer = ""
while len(buffer) < BLOCKSIZE:
  data = sock.recv(BLOCKSIZE-len(buffer))
  if not data:
    break # other end is closed!
  buffer += data

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Ron.Barak at lsi.com  Sun Feb  8 11:17:34 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 8 Feb 2009 16:17:34 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <mailman.41126.1234094855.3486.python-list@python.org>
References: <mailman.41126.1234094855.3486.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68779F@enbmail01.lsi.com>

Hi John,

Maybe you encountered the below issue in your Python programming, and you may offer advise ?

I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
I do not need the cStringIO.StringO in the target object.
The target instance is to be pickled.

Googling made me devise the following plan: do a copy/deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.

However, trying to use copy.deepcopy produced (see full traceback below my signature): TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()

Is there a way to create a copy of the instance, sans the cStringIO.StringO ?

If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).

Trying that, I did:

            for_pickle_log_stream = LogStream(sac_log_file)
            for key in log_stream.__dict__:
                if key != "input_file":
                    for_pickle_log_stream[key] = log_stream[key]

But that gave me:

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 393, in <module>
    for_pickle_log_stream[key] = log_stream[key]
AttributeError: FailoverMatches instance has no attribute '__getitem__'

Can you suggest a better way ?



Another question: Do you have an example of creating a __getitem__ method for my class?
The class includes the following:

log_stream.__dict__:
{   'db': [   {   'DPM': 'iSW-00-090',
                  'end_time': '2009 Dec 15 16:17:24',
                  'event': 'Volume failover',
                  'event_duration': 0L,
                  'first_line_pos': 12453,
                  'last_line_pos': 12871,
                  'rec_num': 0,
                  'start_time': '2009 Dec 15 16:17:24',
                  'volume_name': 'Domain 5:DVol1_1'},
              {   'DPM': 'iSW-00-090',
                  'end_time': '2009 Dec 15 16:17:24',
                  'event': 'Volume failover',
                  'event_duration': 0L,
                  'first_line_pos': 13409,
                  'last_line_pos': 13827,
                  'rec_num': 1,
                  'start_time': '2009 Dec 15 16:17:24',
                  'volume_name': 'Domain 5:DVol1_2'}],
    'end_timestamp': 1260886645L,
    'file_pointer': 58180,
    'filename_array': [   u'C:\\Documents and Settings\\rbarak\\rbarak_devel\\LogManager\\logs_3_vol\\sac.log.367lines.gz'],
    'input_file': <cStringIO.StringO object at 0x01B3D700>,
    'last_line_offset': 58181,
    'log_stream_array': [<LogStream.LogStream instance at 0x01B87350>]}

(the red item is not needed in the target object).

Thanks,
Ron.

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 388, in <module>
    for_pickle_log_stream = copy.deepcopy(log_stream)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 291, in _deepcopy_inst
    state = deepcopy(state, memo)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 254, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "c:\Python25\lib\copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "c:\Python25\lib\copy.py", line 322, in _reconstruct
    y = callable(*args)
  File "c:\Python25\lib\copy_reg.py", line 92, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
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From loredana.pier at gmail.com  Sun Feb  8 11:30:06 2009
From: loredana.pier at gmail.com (loredana.pier at gmail.com)
Date: Sun, 8 Feb 2009 08:30:06 -0800 (PST)
Subject: The fastest way to convert a long list of date
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
	<gmmo2r$u3m$02$1@news.t-online.com>
Message-ID: <ed37cba6-8b99-42f7-8b4e-926cf028e974@s20g2000yqh.googlegroups.com>

First of all: Thanks for your reply
My use case is the following:
I perform a query to DB and the result of query is this;

>>> print rows
{?Label?: {'2009:01:30': 9, '2009:01:28': 13, '2009:01:29': 19,
'2009:01:26': 1, '2009:01:27': 3, '2009:01:20': 86, '2009:01:22': 3,
'2009:01:23': 12, '2009:02:07': 3, '2009:02:06': 12, '2009:02:05': 15,
'2009:02:04': 12, '2009:02:02': 2}}

I want to make a chart with this data using JSON format where:
?	the key ?Label? is the title of chart,
?	rows['Label'].keys() is x values,
?	rows[?Label?].values() is the y values

So my goal is:

1)	to fill the bin of chart with no data (for example  in this tupla..
[.., '2009:01:28: 9, '2009:01:30: 13,..].. the date '2009:01:29? is
missing and I want to append the value ['2009:01:29?,0] to rows
[?Label?])

2)	convert the date format (for example in '%A %d, %b %y')

3)	transform rows dictionary in JSON code

The point 3) is easy to implement but I?m wondering which is the best
way to implement the point 1) and 2) ...considering it will be used
for a web application (CherryPy)?

thanks,

Loredana


From aahz at pythoncraft.com  Sun Feb  8 11:32:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 8 Feb 2009 08:32:05 -0800
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
Message-ID: <gmn1e5$3eh$1@panix3.panix.com>

In article <4986bfd7$0$9385$ba4acef3 at news.orange.fr>,
m.banaouas <banaouas.medialog at wanadoo.fr> wrote:
>
>Working with the ElementTree module, I looked for clone element
>function but not found such tool:

Have you tried using copy.deepcopy()?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From geekmail at usenot.de  Sun Feb  8 11:44:14 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sun, 8 Feb 2009 17:44:14 +0100
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org> <gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de> <gmc979$b9r$1@aioe.org>
	<mailman.8798.1233774905.3487.python-list@python.org>
	<gmmkkh$pcf$2@aioe.org>
Message-ID: <20090208174414.4837b34c@usenot.de>

On Sun, 08 Feb 2009 07:54:13 -0500 Pat <Pat at junk.net> wrote:

> Terry Reedy wrote:
> > Pat wrote:
> >> Andreas Waldenburger wrote:
> >>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
> >>>
> >>>> Tobiah wrote:
> >>>>> Just out of curiosity, why was len() made to
> >>>>> be it's own function?  I often find myself
> >>>>> typing things like my_list.len before I
> >>>>> catch myself.
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Toby
> >>>> I'm surprised that no one responded to that question.
> >>>>
> >>> Huh? Gabriel Genellina replied about 46 minutes after it was
> >>> posted. Might it be that your newsserver is a bit laggy?
> >>>
> >>> regards
> >>> /W
> >>>
> >>
> >> Might be laggy.  Who knows.
> >>
> >> Why didn't you answer the len() question?
> > 
> > I didn't respond because it has been asked and answered before, so
> > the answer can be found in the google archives or even maybe the
> > FAQ.
> 
> Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?
> 
No, I am. Pretty clear from the "From" header. ;)


> If you didn't feel like answering the question, why did you add an 
> utterly worthless post?
> 
There, there. Let's not get too excited, OK? I made an observation that
I felt might be beneficial to you (even if only marginally so). I did
not mean it as an insult. I'm sorry if it seemed that way.

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From steve at holdenweb.com  Sun Feb  8 12:00:52 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 12:00:52 -0500
Subject: len()
In-Reply-To: <20090208174414.4837b34c@usenot.de>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>
	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>	<mailman.8798.1233774905.3487.python-list@python.org>	<gmmkkh$pcf$2@aioe.org>
	<20090208174414.4837b34c@usenot.de>
Message-ID: <gmn34g$k65$1@ger.gmane.org>

Andreas Waldenburger wrote:
> On Sun, 08 Feb 2009 07:54:13 -0500 Pat <Pat at junk.net> wrote:
> 
>> Terry Reedy wrote:
>>> Pat wrote:
>>>> Andreas Waldenburger wrote:
>>>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>>>
>>>>>> Tobiah wrote:
>>>>>>> Just out of curiosity, why was len() made to
>>>>>>> be it's own function?  I often find myself
>>>>>>> typing things like my_list.len before I
>>>>>>> catch myself.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Toby
>>>>>> I'm surprised that no one responded to that question.
>>>>>>
>>>>> Huh? Gabriel Genellina replied about 46 minutes after it was
>>>>> posted. Might it be that your newsserver is a bit laggy?
>>>>>
>>>>> regards
>>>>> /W
>>>>>
>>>> Might be laggy.  Who knows.
>>>>
>>>> Why didn't you answer the len() question?
>>> I didn't respond because it has been asked and answered before, so
>>> the answer can be found in the google archives or even maybe the
>>> FAQ.
>> Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?
>>
> No, I am. Pretty clear from the "From" header. ;)
> 
> 
>> If you didn't feel like answering the question, why did you add an 
>> utterly worthless post?
>>
> There, there. Let's not get too excited, OK? I made an observation that
> I felt might be beneficial to you (even if only marginally so). I did
> not mean it as an insult. I'm sorry if it seemed that way.

Right, well let's *all* calm down, and resolve not to bother making
posts that don't contribute something positive. It's not like this is a
low-bandwidth group, there's always plenty going on.

regards
 Steve

who is still hoping that one day Xah Lee will post and *nobody* will
reply ...
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cjw at ncf.ca  Sun Feb  8 12:18:32 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sun, 08 Feb 2009 12:18:32 -0500
Subject: easy_install
In-Reply-To: <6v88eaFifbroU1@mid.uni-berlin.de>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
Message-ID: <498F13E8.40501@ncf.ca>

Diez B. Roggisch wrote:
> hall.jeff at gmail.com wrote:
> 
>> For the life of me I can not figure out how to get easy_install to
>> work. The syntax displayed on the web page does not appear to work
>> properly.
>>
>> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
> 
> It usually works for me - so what does "not appear to work properly"
> actually mean?
> 
> Diez

I updated my easy_install, used the 
scripts directory, dropped the "c:\" and 
it gave the response below for me:

C:\Documents and 
Settings\cjw\Desktop>c:\Python25\scripts\easy_install 
  MySQL_python-1.2.2-py2.4-win32.egg
Searching for 
MySQL-python-1.2.2-py2.4-win32.egg
Reading 
http://pypi.python.org/simple/MySQL_python-1.2.2-py2.4-win32.egg/
Reading 
http://pypi.python.org/simple/MySQL-python-1.2.2-py2.4-win32.egg/
Couldn't find index page for 
'MySQL_python-1.2.2-py2.4-win32.egg' 
(maybe misspelled?)
Scanning index of all packages (this may 
take a while)
Reading http://pypi.python.org/simple/
No local packages or download links 
found for MySQL-python-1.2.2-py2.4-win32.egg
error: Could not find suitable 
distribution for 
Requirement.parse('MySQL-python-1.2.2-py2.4-win32.egg')

C:\Documents and Settings\cjw\Desktop>

I hope that this is of some help.

Colin W.


From benjamin.kaplan at case.edu  Sun Feb  8 12:23:24 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 8 Feb 2009 12:23:24 -0500
Subject: easy_install
In-Reply-To: <498F13E8.40501@ncf.ca>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de> <498F13E8.40501@ncf.ca>
Message-ID: <ec96e1390902080923y529eaa4bh98390552d029e0e3@mail.gmail.com>

On Sun, Feb 8, 2009 at 12:18 PM, Colin J. Williams <cjw at ncf.ca> wrote:

> Diez B. Roggisch wrote:
>
>> hall.jeff at gmail.com wrote:
>>
>>  For the life of me I can not figure out how to get easy_install to
>>> work. The syntax displayed on the web page does not appear to work
>>> properly.
>>>
>>> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
>>>
>>
>> It usually works for me - so what does "not appear to work properly"
>> actually mean?
>>
>> Diez
>>
>
> I updated my easy_install, used the scripts directory, dropped the "c:\"
> and it gave the response below for me:
>
> C:\Documents and Settings\cjw\Desktop>c:\Python25\scripts\easy_install
>  MySQL_python-1.2.2-py2.4-win32.egg
> Searching for MySQL-python-1.2.2-py2.4-win32.egg
> Reading http://pypi.python.org/simple/MySQL_python-1.2.2-py2.4-win32.egg/
> Reading http://pypi.python.org/simple/MySQL-python-1.2.2-py2.4-win32.egg/
> Couldn't find index page for 'MySQL_python-1.2.2-py2.4-win32.egg' (maybe
> misspelled?)
> Scanning index of all packages (this may take a while)
> Reading http://pypi.python.org/simple/
> No local packages or download links found for
> MySQL-python-1.2.2-py2.4-win32.egg
> error: Could not find suitable distribution for
> Requirement.parse('MySQL-python-1.2.2-py2.4-win32.egg')
>
> C:\Documents and Settings\cjw\Desktop>
>
> I hope that this is of some help.


the py2.4 part of the egg implies that it was compiled for Python 2.4. You
are trying to use Python 2.5. Try looking for
MySQL-python-1.2.2-py2.5-win32.egg instead.


>
>
> Colin W.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From gherron at islandtraining.com  Sun Feb  8 12:58:44 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 08 Feb 2009 09:58:44 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
Message-ID: <498F1D54.9010509@islandtraining.com>

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From apt.shansen at gmail.com  Sun Feb  8 13:13:10 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 8 Feb 2009 10:13:10 -0800
Subject: easy_install
In-Reply-To: <498F13E8.40501@ncf.ca>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de> <498F13E8.40501@ncf.ca>
Message-ID: <7a9c25c20902081013l74b7c839u3c6f8b839ad6b463@mail.gmail.com>

> I updated my easy_install, used the scripts directory, dropped the "c:\" and
> it gave the response below for me:

That's kinda apples to oranges to what the OP's problem is.

The OP appears to be trying to install an egg he downloaded
previously. You're instructing easy_install (by dropping the c:\) to
search PyPi for an egg that isn't provided. The problem you're having
is that it can't find on the internet any packages that match that
name (because if you wanted it to find something on the internet,
you'd say "easy_install MySQL_python").

--S


From martin at v.loewis.de  Sun Feb  8 13:30:58 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 19:30:58 +0100
Subject: sortable table in python 3.0
In-Reply-To: <HPqjl.10476$Db2.10474@edtnps83>
References: <HPqjl.10476$Db2.10474@edtnps83>
Message-ID: <498f24e2$0$3368$9b622d9e@news.freenet.de>

Peter Pei wrote:
> In one of my program, I used something called MultiColumnList, which is
> one of the sortable table widgets done in python. However 3.0 sort is
> different. I googled and found couple of other implementations, but all
> in python 3.0 -.
> 
> Does anyone know any solution in 3.0? or anything that has already been
> upgraded to 3.0? Thanks.

You need to use the key= argument to sort.

Martin


From seaworthyjeremy at gmail.com  Sun Feb  8 13:42:02 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sun, 8 Feb 2009 10:42:02 -0800 (PST)
Subject: Python Module: nift
Message-ID: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>

What are your thoughts on this module I created?

'''
    A Python Module created by a High School Student.
           Includes rev(), reet(), and leet().

                    Import nift

    Function:       nift.rev()
    Description:    Reverses a string
    Usage:          nift.rev('string')
    Example:        nift.rev('Testing function.')
    Output:         '.noitcnuf gnitseT'

    Function:       nift.reet()
    Description:    Reverses a string
                    and transforms to leet text.
    Usage:          nift.reet('string')
    Example:        nift.reet('Hello World!')
    Output:         'dlr0W 0ll3H'

    Function:       nift.leet()
    Description:    Transforms a string
                    into leet text.
    Usage:          nift.leet('string')
    Example:        nift.leet('Hello there!')
    Output:         'H3ll0 7h3r3!'

    Setup:
                    * Save to Python Directory\Lib\ as nift.py
                    * Now you may import it by:
                        from nift import function
                        function()
                                    OR
                        import nift
                        nift.function()

    * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
    * This Module and its functions were created for my own fun, also
*
    * contributing to Inter-Society. I don't mind if anyone modifies
*
    *  this module or adds on to it, as long as you attribute it to
*
    *                           Myself.
*
    * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
'''

def rev(string):
    list = []
    final = ''
    for letters in string:
        list.append(letters)
    list.reverse()
    for letters in list:
        final = final + letters
    return final

def reet(string):
    list = []
    final = ''
    for letters in string:
        list.append(letters)
    list.reverse()
    for letters in list:
        if letters == 'e' or letters == 'E':
            letters = '3'
        elif letters == 'a' or letters == 'A':
            letters = '4'
        elif letters == 'i' or letters == 'I':
            letters = '1'
        elif letters == 't' or letters == 'T':
            letters = '7'
        elif letters == 's' or letters == 'S':
            letters = '5'
        elif letters == 'o' or letters == 'O':
            letters = '0'
        elif letters == 'b' or letters == 'B':
            letters = '8'
        final = final + letters
    return final

def leet(string):
    list = []
    final = ''
    for letters in string:
        if letters == 'e' or letters == 'E':
            letters = '3'
        elif letters == 'a' or letters == 'A':
            letters = '4'
        elif letters == 'i' or letters == 'I':
            letters = '1'
        elif letters == 't' or letters == 'T':
            letters = '7'
        elif letters == 's' or letters == 'S':
            letters = '5'
        elif letters == 'o' or letters == 'O':
            letters = '0'
        elif letters == 'b' or letters == 'B':
            letters = '8'
        list.append(letters)
    for letters in list:
        final = final + letters
    return final


From martin at v.loewis.de  Sun Feb  8 13:43:01 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sun, 08 Feb 2009 19:43:01 +0100
Subject: easy_install
In-Reply-To: <mailman.9097.1234116794.3487.python-list@python.org>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>	<6v88eaFifbroU1@mid.uni-berlin.de>
	<498F13E8.40501@ncf.ca>
	<mailman.9097.1234116794.3487.python-list@python.org>
Message-ID: <498f27b6$0$28732$9b622d9e@news.freenet.de>

> That's kinda apples to oranges to what the OP's problem is.
> 
> The OP appears to be trying to install an egg he downloaded
> previously.

I think he actually didn't - if you read his messages, nowhere
he said that he actually downloaded the file, and that it actually
exists in the root directory of c:

Regards,
Martin


From martin at v.loewis.de  Sun Feb  8 13:45:47 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 19:45:47 +0100
Subject: easy_install
In-Reply-To: <4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
Message-ID: <498F285B.6060905@v.loewis.de>

> http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-installing-a-package
> 
> seems to imply that after installation I can goto a command prompt and
> type
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

These instructions must have misled you. This command only works if you
actually have a file c:\MySQL_python-1.2.2-py2.4-win32.egg on your disk,
e.g. after downloading it, from

http://pypi.python.org/pypi/MySQL-python/1.2.2

If you haven't downloaded it, you have two choices

1. download it, and then give the full filename to easy_install
   (*not* c:\MySQL_python-1.2.2-py2.4-win32.egg, unless you download
   to c:\)

2. ask easy_install to download first, with

   easy_install MySQL-python

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 13:48:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 16:48:24 -0200
Subject: Lists implemented as integer-hashed Dictionaries?
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <op.uo1qiybbx6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 01:18:37 -0200, er <erobererunc at gmail.com> escribi?:

> Somebody much more intelligent than I said today that someone told him  
> that Python lists are just dictionaries with lists hashed by integers.

In addition to all other responses you received, I'd add that lists and  
dictionaries share the same syntax a[x] and the same magic methods in  
Python code (__getitem__, __setitem__, __delitem__). But the similarity  
stops here. The CPython implementation has two different sets of methods,  
one for sequences and other for mappings, so when you override e.g.  
__getitem__ in Python code it replaces either sq_item or mp_subscript  
depending on which one is defined.

Other implementations might choose to do different, but at least on  
standard PC hardware I can't imagine how to efficiently implement lists as  
dictionaries...

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 13:48:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 16:48:24 -0200
Subject: Lists implemented as integer-hashed Dictionaries?
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <op.uo1qiyx7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 01:18:37 -0200, er <erobererunc at gmail.com> escribi?:

> Somebody much more intelligent than I said today that someone told him  
> that Python lists are just dictionaries with lists hashed by integers.

In addition to all other responses you received, I'd add that lists and  
dictionaries share the same syntax a[x] and the same magic methods in  
Python code (__getitem__, __setitem__, __delitem__). But the similarity  
stops here. The CPython implementation has two different sets of methods,  
one for sequences and other for mappings, so when you override e.g.  
__getitem__ in Python code it replaces either sq_item or mp_subscript  
depending on which one is defined.

Other implementations might choose to do different, but at least on  
standard PC hardware I can't imagine how to efficiently implement lists as  
dictionaries...

-- 
Gabriel Genellina



From clp2 at rebertia.com  Sun Feb  8 13:53:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 10:53:57 -0800
Subject: Python Module: nift
In-Reply-To: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <50697b2c0902081053n492696f3n40f5896ced42db66@mail.gmail.com>

On Sun, Feb 8, 2009 at 10:42 AM, J <seaworthyjeremy at gmail.com> wrote:
> What are your thoughts on this module I created?

* You should probably use individual docstrings for each function
rather than one giant module docstring
* Don't use 'list' as a variable name; it shadows the name of the
builtin list type
* You can use the .lower() or .upper() method of strings to get rid of
half the 'or'-s in leet() and reet(). Better yet, use a dict rather
than a long if-elif chain.
* To convert a list of strings to a single string, use
''.join(the_list) instead of:
final = ''
for letters in the_list:
    final = final + letters #also, += is preferred in cases like this
* To convert a string to a list of characters, use list(string) instead of:
the_list = []
final = ''
for letters in string:
    the_list.append(letters)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Scott.Daniels at Acm.Org  Sun Feb  8 14:07:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 08 Feb 2009 11:07:46 -0800
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
Message-ID: <JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>

chohazel at gmail.com wrote:
> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.
> Thanks.

If you can read what you have at all, try to go toHelp (on the top),
then down in that menu to "Configure IDLE ..."
There will be a possibly long delay.  Then on the tab in the produced
window, You can set the Base Editor Font and Size.  I use Tahoma 14.
Then go click "Ok".  If the display doesn't get better, you might have
to exit from Idle and restart it.  If this diesn't work, get back to me
and we can try something more drastic.

--Scott David Daniels
Scott.Daniels at Acm.Org



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 14:09:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 17:09:51 -0200
Subject: How to copy an instance without its cStringIO.StringO item ?
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68779F@enbmail01.lsi.com>
Message-ID: <op.uo1ripp8x6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 14:17:34 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

> I need to copy an instance of a class, where one of the items in the  
> original is a cStringIO.StringO object.
> I do not need the cStringIO.StringO in the target object.
> The target instance is to be pickled.
> [...]
>             for_pickle_log_stream = LogStream(sac_log_file)
>             for key in log_stream.__dict__:
>                 if key != "input_file":
>                     for_pickle_log_stream[key] = log_stream[key]

Note that you're iterating over __dict__ keys, but the last line does not  
use __dict__. Either put __dict__ everywhere, or:
     setattr(for_pickle_log_stream, key, getattr(log_stream, key))

But if you want this copy just to pickle it, follow Christian Heimes  
advice and define __getstate__ / __setstate__.

-- 
Gabriel Genellina



From lists at cheimes.de  Sun Feb  8 14:33:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 20:33:35 +0100
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <gmnc2f$e6l$1@ger.gmane.org>

er schrieb:
> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!

I like to add some technical information to the topic.

In CPython (the most common implementation of Python in C89) lists are
implemented as arrays of PyObject* pointers with a non linear growth
rate. They are neither implemented as linked lists or as hash maps.

The array based implementation makes the most common operations as fast
as possible: creation of a list with a known size of elements,
iteration, item access, appending and popping from the tail of a list.
Iteration and item access (somelist[1]) is a O(1) op.
The internal array grows non linear and is usually over-allocated. This
makes appending to the end faster because the array doesn't need to be
copied with every append().

Uncommon operations like inserts at the head of the lists are slower and
require more memcopy ops. CPython has a deque implementation in the
collections module with is optimized for both changing both ends of a
list like object.

Christian



From lists at cheimes.de  Sun Feb  8 14:38:25 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 20:38:25 +0100
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
	<7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
Message-ID: <gmncbh$eui$1@ger.gmane.org>

Stephen Hansen schrieb:
> Now, I believe Python sets *are* for all intents and purposes
> dictionaries, but I think that's just because its the easiest and most
> efficient way to implement their uniqueness properties; they took the
> very-well-tuned dictionary implementation and cut out the stuff not
> needed by sets and did some tweaks here or there. I /believe/.

You are correct. The first set implementation in pure Python was using a
dict as internal storage. The new set implementation is heavily based on
the highly optimized dict code. Sets are basically dicts without values.

from Objects/setobject.c

   set object implementation
   Written and maintained by Raymond D. Hettinger <python at rcn.com>
   Derived from Lib/sets.py and Objects/dictobject.c.



From bearophileHUGS at lycos.com  Sun Feb  8 14:59:41 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 11:59:41 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
Message-ID: <1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>

More suggestions for a real-world Python programmer:
- There's code duplication, the original poster may express reet as a
composition of the other functions.
- A Python string/list/array can be inverted with [::-1]
- I suggest to convert the examples of the main doscstring into
doctests.
- The main docstring looks too much heavy.
- To convert many ASCII chars there's the str.translate method.
- Generally I suggest to learn to code in the small, using as little
code as possible.

Bye,
bearophile


From david.birdsong at gmail.com  Sun Feb  8 15:07:08 2009
From: david.birdsong at gmail.com (birdsong)
Date: Sun, 8 Feb 2009 12:07:08 -0800 (PST)
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com> 
	<20090207153459.123c5706@usenot.de>
Message-ID: <568da34b-0602-44d5-b5d3-496b3cd096cc@r15g2000prd.googlegroups.com>

On Feb 7, 6:34?am, Andreas Waldenburger <geekm... at usenot.de> wrote:
> On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
>
> <st... at pearwood.info> wrote:
> > Andreas Waldenburger wrote:
>
> > > It seems that there is a for...else construct. Replacing the inner
> > > if with pass seems to confirm this. The else clause is still
> > > executed.
>
> > Yes, there is a for...else construct.
>
> That's something. In 6+ years of Python programming I've never seen or
> heard of this thing. This might be useful, apparently.
>
yeah, about 4 years for me and i've never noticed this feature.

> > [snip]
>
> > > What's broken here: Python or my brain?
>
> > Perhaps we should not answer that question.
>
> I did phrase that rather provocatively, didn't I?
>
> Well thanks. I'll try to learn less noisily in the future. :)
>
> /W
>
> --
> My real email address is constructed by swapping the domain with the
> recipient (local part).



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:25:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:25:53 -0200
Subject: Path question
References: <mailman.8716.1233686855.3487.python-list@python.org>
	<6urjrhFgvif8U1@mid.uni-berlin.de> <498ECB0C.5050705@gmail.com>
Message-ID: <op.uo1u1fpnx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 10:07:40 -0200, Geert Vancompernolle  
<geert.discussions at gmail.com> escribi?:

> Diez B. Roggisch wrote:
>> Geert Vancompernolle schrieb:
>>> Hi,
>>>
>>> I have the following path construction:
>>>
>>> ./src/__init__.py
>>>     /main.py
>>>     /modules/__init__.py
>>>             /application.py
>>>     /ui/__init__.py
>>>        /mainwindow/__init__.py
>>>                   /mainwindow.py
>>>
>>> Now I want to call the method 'MainWindow' in the module 'mainwindow',  
>>> from the module 'application'.
>>>
>>> I'm having the following import statement in 'applications.py':
>>>
>>> from .. ui.mainwindow.mainwindow import MainWindow
>>>
>>> That doesn't work.  I've also tried many other combinations like from  
>>> ..ui.mainwindow...  but none of them work.
>>>
>>> I always get the following error:
>>>
>>> "Attempted relative import beyond toplevel package"
>>>
>>> How can I import the method 'MainWindow' from 'mainwindow' into  
>>> 'application', using the explicit relative import rules?
>>>
>>> Or is there a better way to do this?
>>>
>>
>> Rename "src" to "myapp", and start main.py from above that. That should  
>> work.
>>
>>
>>
>> Diez
>> -- http://mail.python.org/mailman/listinfo/python-list
>>
> That trick did it, thanks!
>
> But I have one more unclarity about relative import rules.  Here  
> <http://docs.python.org/tutorial/modules.html?highlight=modules>, one  
> can find an explanation about modules in the official Python 2.6.1  
> documentation.
>
> In that article, there's an example of importing relative packages (in  
> the section "Packages").
>
> I see the following examples:
>
> from . import echo
> from .. import formats
> from ..filters import equalizer
>
>
> Applying that mechanism on my application, I'm using the following  
> construction (see my initial email):
>
> "from .. ui.mainwindow.mainwindow import MainWindow"
>
> But using "from ..ui.mainwindow.mainwindow import MainWindow" seems to  
> be giving exactly the same result (mind the lacking space between ".."  
> and "ui").
>
> So, what's the difference (if there is one) between "from ..  
> ui.mainwin..." and "from ..ui.mainwin..." (again, mind the difference in  
> space)?

There is none. It's the same as:

 from .    . ui  .mainwindow.  mainwindow      import     mainWindow

Whitespace is irrelevant here. The quoted examples mean:

> from . import echo
import the "echo" module/package from the current package

> from .. import formats
import the "formats" module/package from one level above the current  
package (if it is a package, it's a sibling directory; if it's a module,  
it's in the parent directory).

> from ..filters import equalizer
import only the name "equalizer" from the "filters" module/package,  
located one level above the current package (same note as previous)

> I guess there's a difference, otherwise it would not be given as an  
> example in the Python documentation.

Note that examples 1 and 2 don't have any name in the "from" part; they're  
like a plain "import echo" or "import formats" (but telling also *where*  
to search for them, so it's not the same thing). The target is a  
module/package, as with a plain "import foo".

The third example only imports a name from another place (filters), also  
telling where to search for the module/package.

When you eventually grasp the concept (and I'm sure you will), could you  
think of a better wording/examples to improve the documentation? (I cannot  
see the deficiencies, just because I *already* know what it means!)

-- 
Gabriel Genellina



From nick at stinemates.org  Sun Feb  8 15:33:06 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sun, 8 Feb 2009 12:33:06 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <20090208203306.GA578@beauTy.hsd1.ca.comcast.net>

Gary

Your email client is set to HTML mode and looks terrible for those of us
who prefer plain view. It also appears your client is not properly
sending your message in  text/plain encoding.




From python-list at davidkra.net  Sun Feb  8 15:38:22 2009
From: python-list at davidkra.net (David Kraeutmann)
Date: Sun, 08 Feb 2009 21:38:22 +0100
Subject: Extracting bytecode out of frozen programs
Message-ID: <498F42BE.4060608@davidkra.net>

Hello,
I need to extract the modules/packages out of a frozen script. It was
compiled using Python 2.2.3 and the standard freeze.py.
I managed to get a shell after execution using PYTHONINSPECT=y and find
the start of a module/package using a hex editor (I got the sta, but
these modules don't seem to be importable.
Is there a way of extracting them so they are importable in a python shell?

Regards,
David Kraeutmann


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:40:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:40:21 -0200
Subject: py2exe and distutils
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net> <6v69rkFi8bmqU2@mid.individual.net>
Message-ID: <op.uo1vpjdlx6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net>  
escribi?:

>> Maxim Demenko schrieb:
>>> Hi,
>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe  
>>> 0.6.9
>>> Now i can't list installed modules, here is the stacktrace:
> [...]
>>> Any suggestion, how to fix this issue?
>>
> Thomas Heller schrieb:
>> Looks like a setuptools problem to me.  Here's the output on my system:
>
> Actually, I don't know where the problem is.  Maybe pydoc?

Yes, pydoc isn't robust enough in 2.5; see  
<http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788>  
for a quick fix.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:55:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:55:13 -0200
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
Message-ID: <op.uo1webxbx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 17:59:41 -0200, <bearophileHUGS at lycos.com> escribi?:

> More suggestions for a real-world Python programmer:
> - There's code duplication, the original poster may express reet as a
> composition of the other functions.
> - A Python string/list/array can be inverted with [::-1]
> - I suggest to convert the examples of the main doscstring into
> doctests.
> - The main docstring looks too much heavy.
> - To convert many ASCII chars there's the str.translate method.
> - Generally I suggest to learn to code in the small, using as little
> code as possible.

I completely agree with all the above suggestions, except this last one.  
Ok, I think I know what you mean, but a beginner might understand this  
completely wrong. Readability is important, and trying to compress too  
much code into one single line should not be the ultimate goal.

-- 
Gabriel Genellina



From ptmcg at austin.rr.com  Sun Feb  8 15:57:39 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 8 Feb 2009 12:57:39 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>

On Feb 8, 12:42?pm, J <seaworthyjer... at gmail.com> wrote:
> What are your thoughts on this module I created?
>
Here are a few steps to illustrate some good basic Python idioms worth
learning:

Step 1: Replace many-branched if-elif with dict

While translating characters in a string is a special case that
usually warrants using str.translate, a more general-purpose technique
to learn is to define a dict that captures the various branching
options, and then use the selecting value as a key to access the
desired branch.
Here is a dict containing your branches:

LEET_LETTERS = {
    "e" : "3",
    "E" : "3",
    "a" : "4",
    "A" : "4",
    "i" : "1",
    "I" : "1",
    "t" : "7",
    "T" : "7",
    "s" : "5",
    "S" : "5",
    "o" : "0",
    "O" : "0",
    "b" : "8",
    "B" : "8",
    }

Now you can implement leet() using access to the LEET_LETTERS
mapping.  Here are 3 different versions, that illustrate the usual
options when accessing entries from a map:
1. Look before you leet, uh, I mean "leap" (check for key existence
before using)
2. Better to ask forgiveness than permission (just use the key and
handle the exception that gets raised if the key is not found - an
homage to Grace Hopper)
3. Slightly different strategy, using dict.get() method instead of key/
indexing into the dict

def leet1(string):
    outlist = []
    for letter in string:
        if letter in LEET_LETTERS:
            letter = LEET_LETTERS[letter]
        outlist.append(letter)
    return "".join(outlist)

def leet2(string):
    outlist = []
    for letter in string:
        try:
            letter = LEET_LETTERS[letter]
        except KeyError:
            pass
        outlist.append(letter)
    return "".join(outlist)

def leet3(string):
    outlist = []
    for letter in string:
        outlist.append( LEET_LETTERS.get(letter,letter) )
    return "".join(outlist)

You can test each in turn without changing your test code, just assign
leet to each of these variants in turn:

leet = leet1
print leet("Hello You Beautiful Sweet World!")

I'm partial to option number 3, so let me show you a few other helpful
tips.

By the way, you can do this if you are doing any kind if if-elif, such
as:

if a=="0":
    fn_1()
elif a=="1":
    fn_100()
elif a=="7":
    fn_greater_than_five()
...

Instead you would write:

# note: values are the methods only, no ()'s
fns = { "0" : fn_1, "1" : fn_100, "7" : fn_greater_than_five }
if a in fns:
    # get desired function from fns map, and call it
    fns[a]()


Step 2: dict construction instead of {} syntax

LEET_LETTERS is so space-consuming, sometimes it is easier to use the
dict constructor with a list expression of list comprehension.  That
is, instead of the built-in syntax P{}'s to define a dict, you can use
the dict constructor and pass a list of (key,value) tuples.

LEET_LETTERS = dict( [("E","3"), ("e","3"), ("A","4"),
("a","4"), ...] )

Well, my fingers are tired and I'm bored already, how about if we
could just list the two strings of key and value characters, and some
how build the tuples by pulling an item from each list one at a time.
Fortunately, that is what Python's zip() function does:

LEET_LETTERS = dict( zip("eEaAiItTsSoObB",
                         "33441177550088") )

(I've listed the key-value pairs one above the other to illustrate how
the mapping will work, but of course, that isn't required.)

Now if I want to add another leet-speak letter (like "6" for "G"), I
just add the two characters on the end of the two strings.


Step 3: Use list comprehension instead of explicit list.appends using
for loop

As was already mentioned in another post, ''.join
(list_of_characters_to_join_together) is preferred to final +=
next_letter_to_add_to_final.  But there is also a nice short and clean
way to build up the list besides explicitly calling append in a loop.
Instead, use a list comprehension.  To do this, you convert:

    outlist = []
    for letter in string:
        outlist.append( LEET_LETTERS.get(letter,letter) )

to:
    outlist = [ LEET_LETTERS.get(letter,letter) for letter in string ]


In fact, Python is so smart, you can skip the list entirely, and just
pass that expression inside the brackets (called a generator
expression) directly to ''.join:

    final = ''.join( LEET_LETTERS.get(letter,letter) for letter in
string )

Just a "list" is not desired variable name since it masks the built-in
list type, I avoid "string" as a name since there is a commonly-used
string module.  How about just plain "s"?

Here is the final version of leet - we even got rid of the variable
final, and just return the value that would have been assigned to it:

LEET_LETTERS = dict( zip("eEaAiItTsSoObB", "33441177550088") )
def leet(s):
    return ''.join( LEET_LETTERS.get(c,c) for c in s )

Soon you'll be writing Python just like all the cool kids!

-- Paul


From blue.indigo at uatel.com.nospam.bogus.invalid.invalid.invalid  Sun Feb  8 16:02:37 2009
From: blue.indigo at uatel.com.nospam.bogus.invalid.invalid.invalid (blue indigo)
Date: Sun, 08 Feb 2009 16:02:37 -0500
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
	<6v2sf4Fhuh4mU1@mid.individual.net>
Message-ID: <pan.2009.02.08.21.02.37.336625@uatel.com.nospam.bogus.invalid.invalid.invalid>

On Fri, 06 Feb 2009 14:32:21 +0100, Pascal Costanza wrote:

> Xah Lee wrote:
>> Pascal Constanza is a Common Lisp fanatic.
> 
> It's Costanza, not Constanza.
> 
> 
> Thank you,
> Pascal

         +-------------------+             .:\:\:/:/:.            
         |   PLEASE DO NOT   |            :.:\:\:/:/:.:           
         |  FEED THE TROLLS  |           :=.' -   - '.=:          
         |                   |           '=(\ 9   9 /)='          
         |   Thank you,      |              (  (_)  )             
         |       Management  |              /`-vvv-'\             
         +-------------------+             /         \            
                 |  |        @@@          / /|,,,,,|\ \           
                 |  |        @@@         /_//  /^\  \\_\          
   @x@@x@        |  |         |/         WW(  (   )  )WW          
   \||||/        |  |        \|           __\,,\ /,,/__           
    \||/         |  |         |          (______Y______)          
/\/\/\/\/\/\/\/\//\/\\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
==================================================================

(f'up set to comp.lang.lisp)

-- 
blue indigo
UA Telecom since 1987


From sjmachin at lexicon.net  Sun Feb  8 16:03:52 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 8 Feb 2009 13:03:52 -0800 (PST)
Subject: How to copy an instance without its cStringIO.StringO item ?
References: <mailman.41126.1234094855.3486.python-list@python.org> 
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com> 
	<mailman.9087.1234101684.3487.python-list@python.org>
Message-ID: <ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>

On Feb 9, 1:01?am, Christian Heimes <li... at cheimes.de> wrote:
> Barak, Ron schrieb:
>
> > Hi,
>
> > I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> > I do not need the cStringIO.StringO in the target object.
> > The target instance is to be pickled.
>
> > Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
>
> > However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
>
> > Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
>
> > If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
>
> > Can you suggest a better way ?
>
> You can overwrite some functions in order to omit attributes from a
> pickle. It's all documented athttp://docs.python.org/library/pickle.html#pickling-and-unpickling-no...

If there is no chance that some other thread could be accessing the
source object, can't the OP just do:
    temp = source.stringio
    del source.stringio
    # make a pickle from source
    source.stringio = temp
?





From gagsl-py2 at yahoo.com.ar  Sun Feb  8 16:14:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 19:14:08 -0200
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
	<fb2218ba0902080110g2ee04900we1dd1515ac30040d@mail.gmail.com>
Message-ID: <op.uo1w9uyex6zn5v@gabriel.sleipnir-bsas>

On Sun, Feb 8, 2009 at 9:12 AM, Terry <terry.yinzhe at gmail.com> wrote:

>> I have made the same analysis to some commercial source code, the
>> dup60 rate is quite often significantly larger than 15%.

En Sun, 08 Feb 2009 07:10:12 -0200, Henry Read <henryar2 at gmail.com>  
escribi?:

> I don't think code duplication rate has strong relationship towards code
> quality.

Not directly; but large chunks of identical code repeated in many places  
aren't a good sign. I'd question myself if all of them are equally tested?  
What if someone fixes a bug - will the change be propagated everywhere?  
Should the code be refactored?


-- 
Gabriel Genellina



From martin at v.loewis.de  Sun Feb  8 16:19:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 22:19:12 +0100
Subject: Extracting bytecode out of frozen programs
In-Reply-To: <mailman.9106.1234126502.3487.python-list@python.org>
References: <mailman.9106.1234126502.3487.python-list@python.org>
Message-ID: <498f4c50$0$30899$9b622d9e@news.freenet.de>

> Is there a way of extracting them so they are importable in a python shell?

Try imp.get_frozen_object.

Regards,
Martin


From bearophileHUGS at lycos.com  Sun Feb  8 16:24:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 13:24:42 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <f2a74f06-b1e6-40e0-a61c-f9a8418eac5f@w34g2000yqm.googlegroups.com>

Paul McGuire:
> LEET_LETTERS = dict( zip("eEaAiItTsSoObB", "33441177550088") )
> def leet(s):
> ? ? return ''.join( LEET_LETTERS.get(c,c) for c in s )

This may be better:

from string import maketrans

def leet(txt):
    leet_chars = maketrans("eEaAiItTsSoObB", "33441177550088")
    return txt.translate(leet_chars)

Moving leet_chars outside the function increases speed a bit.

Or for more expert Python programmers, you can add an attribute the
object function, I don't know if you like this:

from string import maketrans

def leet(txt):
    return txt.translate(leet.chars)
leet.chars = maketrans("eEaAiItTsSoObB", "33441177550088")

It's executes maketrans once only and keeps the namespace tidy. So
it's a bit like a static variable in other languages.

Bye,
bearophile


From clp2 at rebertia.com  Sun Feb  8 16:28:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 13:28:55 -0800
Subject: Python Module: nift
In-Reply-To: <a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902081328m143f6e45l8c6425022ed2b9bc@mail.gmail.com>

On Sun, Feb 8, 2009 at 12:57 PM, Paul McGuire <ptmcg at austin.rr.com> wrote:
> On Feb 8, 12:42 pm, J <seaworthyjer... at gmail.com> wrote:
>> What are your thoughts on this module I created?
>>
> Here are a few steps to illustrate some good basic Python idioms worth
> learning:
>
> Step 1: Replace many-branched if-elif with dict
>
> While translating characters in a string is a special case that
> usually warrants using str.translate, a more general-purpose technique
> to learn is to define a dict that captures the various branching
> options, and then use the selecting value as a key to access the
> desired branch.
> Here is a dict containing your branches:
>
> LEET_LETTERS = {
>    "e" : "3",
>    "E" : "3",
>    "a" : "4",
>    "A" : "4",
>    "i" : "1",
>    "I" : "1",
>    "t" : "7",
>    "T" : "7",
>    "s" : "5",
>    "S" : "5",
>    "o" : "0",
>    "O" : "0",
>    "b" : "8",
>    "B" : "8",
>    }
<snip>
> LEET_LETTERS is so space-consuming, sometimes it is easier to use the
> dict constructor with a list expression of list comprehension.  That
> is, instead of the built-in syntax P{}'s to define a dict, you can use
> the dict constructor and pass a list of (key,value) tuples.
>
> LEET_LETTERS = dict( [("E","3"), ("e","3"), ("A","4"),
> ("a","4"), ...] )
>
> Well, my fingers are tired and I'm bored already, how about if we
> could just list the two strings of key and value characters, and some
> how build the tuples by pulling an item from each list one at a time.
> Fortunately, that is what Python's zip() function does:
>
> LEET_LETTERS = dict( zip("eEaAiItTsSoObB",
>                         "33441177550088") )
>
> (I've listed the key-value pairs one above the other to illustrate how
> the mapping will work, but of course, that isn't required.)
>
> Now if I want to add another leet-speak letter (like "6" for "G"), I
> just add the two characters on the end of the two strings.

This I disagree with as being unnecessarily clever; the dict literal
is just fine as-is and the zip() makes it less clear. However, I would
definitely rewrite the dict to use less lines, which, after removing
the capital dupes (as I mentioned in my post, just use .lower()),
looks like:

LEET_LETTERS = {"e" : "3", "a" : "4", "i" : "1", "t" : "7", "s" : "5",
    "o" : "0", "b" : "8"}

which is better, IMHO.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From REMpeteOVE at CAPpetezilla.ITALSco.uk  Sun Feb  8 16:32:53 2009
From: REMpeteOVE at CAPpetezilla.ITALSco.uk (Peter Chant)
Date: Sun, 08 Feb 2009 21:32:53 +0000
Subject: Newbie SWMixer / numpy help - AssertionError
References: <pej066x0mc.ln2@phoenix.fire>
	<mailman.9066.1234046887.3487.python-list@python.org>
Message-ID: <5lv366x8tf.ln2@phoenix.fire>

Robert Kern wrote:

> 
>    snd = swmixer.Sound(data=tone_data)
> 
> Well, sort of. You probably need to scale your data and convert it to
> int16 format. It's currently in floating point format.

Done and working, thanks.  As "file" was not needed for file="test.wav" I
assumed the data prefix for data was not essential.

> 
> When asking about why something fails, it helps a lot if you specify
> exactly how it fails and what you expected to happen. Copy-and-paste any
> error messages exactly.

OK

> 
> If you need more help with SWMixer's API, I recommend asking the author.
> It's not in widespread use, so he can probably give you better and faster
> help than we can.
> 
> If you need more help with numpy, specifically, you can ask on the
> numpy-discussion mailing list. numpy *is* in widespread use, but there's a
> higher concentration of helpful numpy users over there.
> 
>    http://www.scipy.org/Mailing_Lists
> 

Most useful response, thanks.

Pete

-- 
http://www.petezilla.co.uk


From bearophileHUGS at lycos.com  Sun Feb  8 16:34:50 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 13:34:50 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
Message-ID: <838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>

Gabriel Genellina:
> bearophile:
> > - Generally I suggest to learn to code in the small, using as little
> > code as possible.
>
> I completely agree with all the above suggestions, except this last one. ?
> Ok, I think I know what you mean, but a beginner might understand this ?
> completely wrong. Readability is important, and trying to compress too ?
> much code into one single line should not be the ultimate goal.

What I meant is to use less code as possible, keeping readability and
the original flexibility.

I can't stress enough the importance of writing less code. Every new
programmer has to learn how much important it is. Less code means less
bugs, less lines to edit and debug, etc. Less code is usually more
elegant, and often more readable (even if you take 3 times to read
each line it may be good anyway if you have 1/10 of the lines of code.
Recently in the "Java to Python" thread someone has posted some Java
class that is scary, you can probably write the same thing in
1/10-1/20 of the lines of code).

The sense for "elegance" in coding is of course (as in every other
human activity) something you learn after many years of exercise, it's
a matter of balance among many opposite things, a matter of
compromises, and it's also tight related with your personal style of
coding. Every programmer develops tastes and and one or more styles,
that other people may not appreciate much.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 16:43:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 19:43:56 -0200
Subject: Extracting bytecode out of frozen programs
References: <498F42BE.4060608@davidkra.net>
Message-ID: <op.uo1ynipfx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 18:38:22 -0200, David Kraeutmann  
<python-list at davidkra.net> escribi?:

> Hello,
> I need to extract the modules/packages out of a frozen script. It was
> compiled using Python 2.2.3 and the standard freeze.py.
> I managed to get a shell after execution using PYTHONINSPECT=y and find
> the start of a module/package using a hex editor (I got the sta, but
> these modules don't seem to be importable.
> Is there a way of extracting them so they are importable in a python  
> shell?

Those modules are exposed via the PyImport_FrozenModules array.
The ctypes documentation has an example for accessing this array, see
http://docs.python.org/library/ctypes#accessing-values-exported-from-dlls


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 17:12:44 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 20:12:44 -0200
Subject: Extracting bytecode out of frozen programs
References: <mailman.9106.1234126502.3487.python-list@python.org>
	<498f4c50$0$30899$9b622d9e@news.freenet.de>
Message-ID: <op.uo1zzibmx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 19:19:12 -0200, Martin v. L?wis <martin at v.loewis.de>  
escribi?:

>> Is there a way of extracting them so they are importable in a python  
>> shell?
>
> Try imp.get_frozen_object.

Ouch... this looks better than using ctypes.
get_frozen_object exists at least since 1.5.2, but has never been  
documented, and the source code says it's obsolete. Should be documented  
now? Any alternative?

-- 
Gabriel Genellina



From vitaliyy at gmail.com  Sun Feb  8 17:32:13 2009
From: vitaliyy at gmail.com (Vitaliy Yermolenko)
Date: Mon, 9 Feb 2009 00:32:13 +0200
Subject: Python on TV-centric platforms
Message-ID: <ccbb236e0902081432k3abf395bued3c18cfab9dfe50@mail.gmail.com>

Hi,

Thanks for thoughts.

As I can see considering Yahoo Widgets (based on
HTML/JavaScript/Flash), XML, AJAX and JavaScript (i. e. web
components) on Figure 1 of
http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx,
it seems, like Pyjamas is more close for Widget Channel integration,
than XBMC Media Center.

Another question is whether Framework API will be available for
Python, and how deployment will be done?

>On Feb 8, 9:23 am, Vitaliy Yermolenko <vital... at gmail.com> wrote:
>> Any chance to see Python to be ready for "Widget Development Kit (WDK)
>> to third-party developers to create applications and services for
>> viewing on TVs [...]
>
>The excellent XBMC[1] has had Python support for years.

WBR, Vitaliy.


From seaworthyjeremy at gmail.com  Sun Feb  8 17:45:52 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sun, 8 Feb 2009 14:45:52 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>

Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
have a question:
How far does Python go in the Game Development field? (Using Python
only, no extensions)


From clp2 at rebertia.com  Sun Feb  8 17:55:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 14:55:53 -0800
Subject: Python Module: nift
In-Reply-To: <e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
	<e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902081455w15408f4aof04fedd80ec862d7@mail.gmail.com>

On Sun, Feb 8, 2009 at 2:45 PM, J <seaworthyjeremy at gmail.com> wrote:
> Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
> have a question:
> How far does Python go in the Game Development field? (Using Python
> only, no extensions)

You pretty much need to integrate with some C(++) libraries in order
to write fancier games. However, you yourself don't need to write any
non-Python in order to utilize these libraries.
Pygame (http://www.pygame.org/) is a popular collection of multimedia
library bindings for Python.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jstroud at mbi.ucla.edu  Sun Feb  8 17:58:37 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 08 Feb 2009 14:58:37 -0800
Subject: TkInter: Problem with propagation of resize events through
	geometry manager hierarchy?
In-Reply-To: <35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>
References: <mailman.9067.1234047013.3487.python-list@python.org>
	<Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>
	<35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>
Message-ID: <xsJjl.16407$yr3.9061@nlpi068.nbdc.sbc.com>

curiouserrandy at gmail.com wrote:
> Thanks!  I hadn't known about the "return 'break'" technique.  But
> I don't follow your sentinel suggestion; how would that sentinel
> ever get reset?

Presumably you would set it from some kind of input. Basically, if you 
don't need to zoom, you wouldn't bother scaling the image. It is the 
scaling step that is expanding your image.

You might want to set any borders to 0.

It seems as if the first time through the event
> chain it'd be set to the sentinel, and the routines that pay
> attention to it would never execute.  What am I missing?
> I tried simply returning 'break' at the end of "refresh()" and
> that made no change in behavior.

You will want to return 'break' at the end of callbacks, like 
display_tag_and_size()

> One thing I've been looking for (including in the source :-J) is
> a description of the precise process that the geometry manager
> goes through in figuring out and then setting sizes for the
> various widgets (on resize or, apparently, startup).  I suspect
> with that + the "return 'break'" technique I could get this to
> work.  But I haven't been having any luck finding that documentation.

I've never found that either. I usually tweak things by trial and error. 
Tkinter (Tk) has some bad habits. Most of the time it is very hard to 
get the precise dimensions of widgets by asking them. The problem is 
exacerbated by platform specific modifications like TkAqua. Ive found 
the best approach is to tweak the math so that the sizing comes out 
consistent and then test and patch for every platform you support. 
Sometimes, if you experiment enough, you can figure out by inference 
what Tk is actually doing under the hood.

The other, more sane option, is to attempt to make guis that don't rely 
on precise size information. Its less satisfying than the pixel level 
control one hopes for, but makes for a faster development process.

Also, you might want to look into Pmw. It has scrolled canvas and 
scrolled frame widgets that might be helpful to you. There is no need to 
reinvent the wheel except for your own enlightenment.

James


-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From martin at v.loewis.de  Sun Feb  8 18:01:18 2009
From: martin at v.loewis.de (=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 09 Feb 2009 00:01:18 +0100
Subject: Extracting bytecode out of frozen programs
In-Reply-To: <mailman.9111.1234131185.3487.python-list@python.org>
References: <mailman.9106.1234126502.3487.python-list@python.org>	<498f4c50$0$30899$9b622d9e@news.freenet.de>
	<mailman.9111.1234131185.3487.python-list@python.org>
Message-ID: <498f643e$0$3360$9b622d9e@news.freenet.de>

> get_frozen_object exists at least since 1.5.2, but has never been
> documented, and the source code says it's obsolete. Should be documented
> now? Any alternative?

get_frozen_object has been marked obsolete in 1997. Whether it can be
un-deprecated should be discussed on python-dev; I can't guess the
rationale for deprecating it.

Regards,
Martin


From rhamph at gmail.com  Sun Feb  8 18:05:31 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sun, 8 Feb 2009 15:05:31 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
	<afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>
	<20090207230719.5bfd6022@gmx.net>
Message-ID: <c6711fdc-c09d-4455-b49a-b3d053bbdd0a@h5g2000yqh.googlegroups.com>

On Feb 7, 3:07?pm, <mma... at gmx.net> wrote:
> On Sat, 7 Feb 2009 12:50:22 -0800 (PST)
> Rhamphoryncus <rha... at gmail.com> wrote:
> > Can you explain this in a little more detail?
>
> In the application, there is one main numpy array of type "O".
> Each element of the array corresponds to one cell in a grid. The user
> may enter a Python expression into the grid cell. The input is
> evaled and the result is stored in the numpy array (the actual process
> is a bit more complicated). Therefore, the object inside a numpy array
> element may be an inconsistent, nested, iterable type.
>
> The user now may access the result grid via __getitem__. When doing
> this, a numpy array that is as flat as possible while comprising the
> maximum possible data depth is returned, i.e.:
>
> 1. Non-string and non-unicode iterables of similar length for each of
> the cells form extra dimensions.
>
> 2. In order to remove different container types, the result is
> flattened, cast into a numpy.array and re-shaped.
>
> 3. Dimensions of length 1 are eliminated.
>
> Therefore, the user can conveniently use numpy ufuncs on the results.
>
> I am referring to the flatten operation in step 2

I'm afraid I still don't understand it, but I'm only minimally
familiar with numpy, nevermind your spreadsheet app.


From gdamjan at gmail.com  Sun Feb  8 18:21:16 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 09 Feb 2009 00:21:16 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
Message-ID: <c06466-nu.ln1@archaeopteryx.softver.org.mk>

> I have made the same analysis to some commercial source code, the
> dup60 rate is quite often significantly larger than 15%.

commercial code sucks often .. that's why they hide it :)


-- 
?????? ( http://softver.org.mk/damjan/ )

Scarlett Johansson: You always see the glass half-empty.
Woody Allen: No. I see the glass half-full, but of poison.



From tdelaney at avaya.com  Sun Feb  8 18:31:36 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Mon, 9 Feb 2009 07:31:36 +0800
Subject: Ordered dict by default
In-Reply-To: <6f38e8bc-4ecd-4b9f-abef-b885cd16b375@p37g2000yqd.googlegroups.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C011117DA@301081ANEX2.global.avaya.com>

bearophileHUGS at lycos.com wrote:

> I have missed another example: It may be possible to create a sorting
> routine that's not stable but is faster than the current stable
> timsort (for example in C++ STL you have both sorting routines, and
> the unstable one is a variant of introsort that is faster than the
> stable version). I think Python will keep the stable one, because even
> if (in theory. In practice it may be quite difficult to write such
> unstable sorter faster than timsort) it can be slower, it's safer and
> more useful than an unstable sort.

Python mandates a stable sort, so this will not change. Note that this
used to not be the case - timsort was introduced in Python 2.3, and
*because* it was *both* stable and blazingly fast, the requirement for a
stable sort was back-dated to Python 2.3.

If timsort had not been so overwhelmingly superior to every other option
at the time (and in particular, without any known worst-case scenarios)
then Python would likely still not be requiring a stable sort. But
because it is so good, the extra performance gain from any future
non-stable sort was considered unlikely to offset the benefits of a
stable sort.

Tim Delaney


From spacebar265 at gmail.com  Sun Feb  8 22:26:13 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Sun, 8 Feb 2009 19:26:13 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
Message-ID: <557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>

On Feb 7, 2:17?am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
> > Hi. Does anyone know how to scan a filecharacterbycharacterand
> > have eachcharacterso I can put it into a variable. I am attempting
> > to make a chatbot and need this to read the saved input to look for
> > spelling mistakes and further analysis of user input.
>
> That does not follow. To analyze a text, the worst possible starting
> point is one variable for eachcharacter(what would you call them --
> character_1, character_2, ... character_65802 ?)
>
> /Jorgen
>
> --
> ? // Jorgen Grahn <grahn@ ? ? ? ?Ph'nglui mglw'nafh Cthulhu
> \X/ ? ? snipabacken.se> ? ? ? ? ?R'lyeh wgah'nagl fhtagn!

How else would you check for spelling mistakes? Because input would be
very unlikely to be lengthy paragraphs I wouldn't even need very many
variables. If anyone could suggest an alternative method this would be
much appreciated.


From ptmcg at austin.rr.com  Sun Feb  8 23:01:25 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 8 Feb 2009 20:01:25 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com> 
	<mailman.9109.1234128545.3487.python-list@python.org>
Message-ID: <947d4cef-e3f2-4e1b-91ff-5f98781f0518@t13g2000yqc.googlegroups.com>

On Feb 8, 3:28?pm, Chris Rebert <c... at rebertia.com> wrote:
> This I disagree with as being unnecessarily clever; the dict literal
> is just fine as-is and the zip() makes it less clear. However, I would
> definitely rewrite the dict to use less lines, which, after removing
> the capital dupes (as I mentioned in my post, just use .lower()),
> looks like:
>
> LEET_LETTERS = {"e" : "3", "a" : "4", "i" : "1", "t" : "7", "s" : "5",
> ? ? "o" : "0", "b" : "8"}
>

Maybe so, I was trying to illustrate zip() and maybe this was getting
too far ahead for a new Python user.

I *do* find that when initializing a list of characters (and for some
reason a string wont do), then instead of this:

vowels = ["A", "E", "I", "O", "U"]


using the list constructor is much easier:

vowels = list("AEIOU")


Or more non-deterministically,

sometimes = lambda s : [s] if random.random() > 0.5 else []
vowels = list("AEIOU") + sometimes("Y")


-- Paul


From kyrie at uh.cu  Sun Feb  8 23:01:46 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 08 Feb 2009 23:01:46 -0500
Subject: Importing a file (not a module).
Message-ID: <1234152106.498faaaa97f1d@mail.uh.cu>


Is there any way to "import" a .py file that is not on sys.path? 
I'd like to 'import' a file that resides somewhere on my filesystem without
having to add it's directory to sys.path. At first, I thought that something like

my_module = __import__("path/to/file")

would work, but I was mistaken. Ideally, the path would be specified as a
relative path from the importer's module, and not from the CWD (that's another
question, I guess).

Related question: how could I change the sys.path for this_script.py without
changing it much? I'd like to have this_script a few more directories on its
pythonpath, but I don't want to clutter the begining of the script with
"sys.path.append(...)"s, specially because I need to do that for several
scripts. I thought of creating a modify_pythonpath.py and import it from all of
them, but I don't want to keep that script on the global python path nor on any
of the project folders (it is required by more than one). 

Currently I have a symlink from the original modify_pythonpath.py to each
project directory, but that seems clumsy.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie






From gagsl-py2 at yahoo.com.ar  Sun Feb  8 23:06:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 02:06:10 -0200
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<mailman.8639.1233608458.3487.python-list@python.org>
	<defjo4h89b144i65l3b2gvnio9nbtibor2@4ax.com>
Message-ID: <op.uo2gckqtx6zn5v@gabriel.sleipnir-bsas>

En Wed, 04 Feb 2009 14:11:07 -0200, Gilles Ganault <nospam at nospam.com>  
escribi?:
> On Mon, 2 Feb 2009 22:00:53 +0100, Martin <martin at marcher.name> wrote:

>> as suggested, the DBA should seriously think about defining the
>> correct type of the column here, for intermediate use and getting
>> stuff to work you could use a view and define some stored procedures
>> on it so that inserting properly works...
>
> Right, but SQLite only has two types: Numeric or text, so I figured
> it'd be better to turn dates into the usual YYYY-MM-DD before saving
> data into an SQLite file.

I'd use the built-in adapter/converter instead of rolling my own:
http://docs.python.org/library/sqlite3.html#default-adapters-and-converters

-- 
Gabriel Genellina



From steve at holdenweb.com  Sun Feb  8 23:13:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 23:13:08 -0500
Subject: Scanning a file character by character
In-Reply-To: <557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
Message-ID: <gmoah0$rhh$1@ger.gmane.org>

Spacebar265 wrote:
> On Feb 7, 2:17 am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
>> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
>>> Hi. Does anyone know how to scan a filecharacterbycharacterand
>>> have eachcharacterso I can put it into a variable. I am attempting
>>> to make a chatbot and need this to read the saved input to look for
>>> spelling mistakes and further analysis of user input.
>> That does not follow. To analyze a text, the worst possible starting
>> point is one variable for eachcharacter(what would you call them --
>> character_1, character_2, ... character_65802 ?)
>>
I believe most people would read the input a line at a time and split
the lines into words. It does depend whether you are attempting
real-time spelling correction, though. That would be a different case.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  8 23:24:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 23:24:51 -0500
Subject: Importing a file (not a module).
In-Reply-To: <1234152106.498faaaa97f1d@mail.uh.cu>
References: <1234152106.498faaaa97f1d@mail.uh.cu>
Message-ID: <gmob70$t36$1@ger.gmane.org>

Luis Zarrabeitia wrote:
> Is there any way to "import" a .py file that is not on sys.path? 
> I'd like to 'import' a file that resides somewhere on my filesystem without
> having to add it's directory to sys.path. At first, I thought that something like
> 
> my_module = __import__("path/to/file")
> 
> would work, but I was mistaken. Ideally, the path would be specified as a
> relative path from the importer's module, and not from the CWD (that's another
> question, I guess).
> 
> Related question: how could I change the sys.path for this_script.py without
> changing it much? I'd like to have this_script a few more directories on its
> pythonpath, but I don't want to clutter the begining of the script with
> "sys.path.append(...)"s, specially because I need to do that for several
> scripts. I thought of creating a modify_pythonpath.py and import it from all of
> them, but I don't want to keep that script on the global python path nor on any
> of the project folders (it is required by more than one). 
> 
> Currently I have a symlink from the original modify_pythonpath.py to each
> project directory, but that seems clumsy.
> 
Take a look at the imp module:

>>> import imp
>>> m = imp.load_source("mymodule", "doors.px")
['G', 'G', 'G'] [1, 1] [1, 1, 1]
['G', 'G', 'C'] [1, 1] [1, 1]
['G', 'C', 'G'] [1] [1, 1]
['G', 'C', 'C'] [1] [1]
['C', 'G', 'G'] [1] [1, 1]
['C', 'G', 'C'] [1] [1]
['C', 'C', 'G'] [] [1]
['C', 'C', 'C'] [] []
>>> m
<module 'mymodule' from 'doors.px'>
>>> import sys
>>> sys.modules['mymodule']
<module 'mymodule' from 'doors.px'>
>>>

As you can see it works with non-standarde xtensions too.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cptn.spoon at gmail.com  Sun Feb  8 23:50:49 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Sun, 8 Feb 2009 20:50:49 -0800 (PST)
Subject: Simple question - stock market simulation
Message-ID: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>

I'm trying to create an incredibly simple stock market simulator to be
used in a childrens classroom and I'm wondering whether someone can
point me in the right direction.

I basically want to be able to have a stock struct as follows:

StockName = "Test"
StockPriceList = (12,13,12,10,10,8,10)
StockRisk = 0.15
StockQty = 2000

And then have a StockMarket struct that can contain 1 to many Stocks.
I then want to be able to iterate through the stocks to perform
operations as such:

for Stock in StockMarket:

I'm not asking for tips on the program itself, I just can't figure out
how to get the data structures in place. Would I use Classes or would
I use dictionaries? Am I completely off the mark with this?

Apologies for such a rudimentary question...I'm very new to all this.


From http  Sun Feb  8 23:58:54 2009
From: http (Paul Rubin)
Date: 08 Feb 2009 20:58:54 -0800
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
Message-ID: <7xljsgyzn5.fsf@ruckus.brouhaha.com>

"cptn.spoon" <cptn.spoon at gmail.com> writes:
> I'm not asking for tips on the program itself, I just can't figure out
> how to get the data structures in place. Would I use Classes or would
> I use dictionaries? Am I completely off the mark with this?

Typically you would use a class for the multi-fielded data structure;
a dictionary is intended more for lookup tables where you don't know
ahead of time what the keys will be.  Also, you'd typically use a list
[1,2,3] rather than a tuple (1,2,3) to hold the price list.


From cptn.spoon at gmail.com  Mon Feb  9 00:10:54 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Sun, 8 Feb 2009 21:10:54 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
Message-ID: <1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>

On Feb 9, 3:58?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> "cptn.spoon" <cptn.sp... at gmail.com> writes:
> > I'm not asking for tips on the program itself, I just can't figure out
> > how to get the data structures in place. Would I use Classes or would
> > I use dictionaries? Am I completely off the mark with this?
>
> Typically you would use a class for the multi-fielded data structure;
> a dictionary is intended more for lookup tables where you don't know
> ahead of time what the keys will be. ?Also, you'd typically use a list
> [1,2,3] rather than a tuple (1,2,3) to hold the price list.

Thanks Paul! I thought this might be the case. So how would I get the
StockMarket class instance to contain many Stock class instances and
then be able to iterate through them? I'm guessing the basic structure
would be as follows...but I think I'm wrong:

class StockMarket:
  pass

class Stock:
  def __init__(self, stockname, stockpricelist[], stockrisk,
stockqty):
    self.stockname = stockname
    self.stockpricelist[] = stockpricelist[]
    self.stockrisk = stockrisk
    self.stockqty = stockqty

Can you possibly point me in the right direction?

Thanks
Phil


From gherron at islandtraining.com  Mon Feb  9 00:44:28 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 08 Feb 2009 21:44:28 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <20090208203306.GA578@beauTy.hsd1.ca.comcast.net>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>	<498F1D54.9010509@islandtraining.com>
	<20090208203306.GA578@beauTy.hsd1.ca.comcast.net>
Message-ID: <498FC2BC.2070300@islandtraining.com>

nick at stinemates.org wrote:
> Gary
>
> Your email client is set to HTML mode and looks terrible for those of us
> who prefer plain view. It also appears your client is not properly
> sending your message in  text/plain encoding.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

Understood.  I too prefer text only, but mistakenly hit "HTML only" for
that email.  Once sent, though, there was no way to recall and fix it. 


From http  Mon Feb  9 00:48:59 2009
From: http (Paul Rubin)
Date: 08 Feb 2009 21:48:59 -0800
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <7x7i4017p0.fsf@ruckus.brouhaha.com>

"cptn.spoon" <cptn.spoon at gmail.com> writes:
>   def __init__(self, stockname, stockpricelist[], stockrisk,
> stockqty): ...

You would say just stockpricelist rather than stockpricelist[],  but
other than that your class def looks good.


From tjreedy at udel.edu  Mon Feb  9 01:29:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:29:02 -0500
Subject: Python Module: nift
In-Reply-To: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <gmoifc$a3h$1@ger.gmane.org>

J wrote:
> What are your thoughts on this module I created?
> 
> '''
>     A Python Module created by a High School Student.
>            Includes rev(), reet(), and leet().

Gutsy of you to post this.

>     Setup:
>                     * Save to Python Directory\Lib\ as nift.py

Add-in modules and packages like this should better go in 
pythonxy/Lib/site-packages, which is there just for this purpose.
One can then easily see what add-ons ore present or not, or delete them, 
  or avoid deletion with uninstallation, or move to another version of 
Python.

tjr



From tjreedy at udel.edu  Mon Feb  9 01:33:24 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:33:24 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <gmncbh$eui$1@ger.gmane.org>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>	<7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
	<gmncbh$eui$1@ger.gmane.org>
Message-ID: <gmoini$a3h$2@ger.gmane.org>

Christian Heimes wrote:
>
> Sets are basically dicts without values.

For CPython true, but abstractly, dicts are sets with values, and 
mappings are often viewed as sets of key,value pairs.



From tjreedy at udel.edu  Mon Feb  9 01:43:28 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:43:28 -0500
Subject: Simple question - stock market simulation
In-Reply-To: <1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <gmojae$boh$1@ger.gmane.org>

cptn.spoon wrote:
> On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> "cptn.spoon" <cptn.sp... at gmail.com> writes:
>>> I'm not asking for tips on the program itself, I just can't figure out
>>> how to get the data structures in place. Would I use Classes or would
>>> I use dictionaries? Am I completely off the mark with this?
>> Typically you would use a class for the multi-fielded data structure;
>> a dictionary is intended more for lookup tables where you don't know
>> ahead of time what the keys will be.  Also, you'd typically use a list
>> [1,2,3] rather than a tuple (1,2,3) to hold the price list.
> 
> Thanks Paul! I thought this might be the case. So how would I get the
> StockMarket class instance to contain many Stock class instances and
> then be able to iterate through them? I'm guessing the basic structure
> would be as follows...but I think I'm wrong:
> 
> class StockMarket:
>   pass
> 

I would start with using a list for StockMarket.

> class Stock:
>   def __init__(self, stockname, stockpricelist[], stockrisk,
> stockqty):
>     self.stockname = stockname
>     self.stockpricelist[] = stockpricelist[]
>     self.stockrisk = stockrisk
>     self.stockqty = stockqty

I would remove the redundant 'stock' from all the parameter and 
attribute names.  (And call 'qty' 'quantity'.)

You will iterating like so:

for stock in StockMarket:
   print(stock.name, stock.quantity,.... or whatever, and the iteration 
variable makes clear that a stock is a Stock.

tjr



From mail at johnohagan.com  Mon Feb  9 01:45:39 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 9 Feb 2009 06:45:39 +0000
Subject: self-aware list of objects able to sense constituent member
	alterations?
In-Reply-To: <6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>
References: <3043ae5c-0168-4249-8a21-63d0268b36f1@k36g2000pri.googlegroups.com>
	<mailman.8186.1233135479.3487.python-list@python.org>
	<6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>
Message-ID: <200902090645.40793.mail@johnohagan.com>

On Fri, 6 Feb 2009, greywine at gmail.com wrote:
> On Jan 28, 4:37?am, John O'Hagan <m... at johnohagan.com> wrote:
> > On Tue, 27 Jan 2009, Reckoner wrote:
> > > I'm not sure this is possible, but I would like to have
> > > a list of ?objects
> > >
> > > A=[a,b,c,d,...,z]
> > >
> > > where, ?in the midst of a lot of processing I might do something like,
> > >
> > > A[0].do_something_which_changes_the_properties()
> > >
> > > which alter the properties of the object 'a'.
> > >
> > > The trick is that I would like A to be mysteriously aware that
> > > something about the ?object 'a' has changed so that when I revisit A,
> > > I will know that the other items in the list need to be refreshed to
> > > reflect the changes in A as a result of changing 'a'.
> > >
> > > Even better would be to automatically percolate the subsequent changes
> > > that resulted from altering 'a' for the rest of the items in the list.
> >
> > [...]
> >
> > Interesting question.
> >
> > Maybe this is too simple for your purpose (or maybe just wrong!), but
> > could you subclass list and give it an "update" method which keeps a
> > dictionary of the state of its members and/or calls another method that
> > makes the appropriate changes in the other members when a change occurs,
> > something like:
> >
> > class SelfAwareList(list):
> >
> > ? ? state_dict = {}
> >
> > ? ? def update(self):
> > ? ? ? ? for i in self:
> > ? ? ? ? ? ? if i.state == 'some_condition':
> > ? ? ? ? ? ? ? ? self.do_stuff_to_other_members()
> > ? ? ? ? ? ? self.state_dict[i] = i.state
> >
> > ? ? def do_stuff_to_other_members(self):
> > ? ? ? ? print 'doing stuff...'
> >
> > ?
> >
> > You could manually call update() on the SelfAwareList instance after
> > calling a method on a SelfAwareList member, or even build it into the
> > members' methods so that it was automatic.
> >
> > HTH,
> >
> > John
>
> Hi Reckoner & John O'Hagan,
>
> Great thread, very interesting.
>
> John, I haven't seen anything like your class that uses list instead
> of object and refers to state directly (i.state in self).  Could you
> elaborate?  Here would be my implementation of your idea:
>
> class SelfAwareList2(object):
>
>     def __init__(self, l):
>         self.l = l
>         self.changed = [False for element in l]
>
>     def __str__(self):
>         return str(self.l)
>
>     def update(self, index, value):
>         self.l[index] = value
>         self.changed[index] = True
>
>     def do_stuff_to_other_members(self):
>         for i in self.changed:
>             if i==False:
>                 self.l[i] += 1
>
> Here you can print and whenever you update your list, self.changed
> keeps track of what changed.  Later on you can call do_stuff_to_others
> which in this case adds 1 to each other element.
>
> I assume that your class replaces the awkwardness of l.update(0, 5)
> with l[0] = 5, but I can't quite wrap my mind around it.

I think my suggestion was much more simplistic than what the OP was after, 
which was far more thoroughly answered by others.

But as far as my version goes, your implementation is fine as far as I can 
tell; although I (possibly mistakenly) interpreted the OP as wanting 
something which kept track of _how_ the items in the list changed, not just 
_if_ they changed.

Trying to put together an example was (naturally) more complicated than I 
thought, but here's a silly one, with apologies to Steven D'Aprano among 
others for stealing the parrot theme:

class Parrot(object):

    def __init__(self, name):
        self.color = 'red'
        self.name = name
    def __repr__(self):
        return self.name

class SelfAwareListOfParrots(list):

    colors = ['red', 'blue', 'yellow', 'green', 'black', 'white']
    state_dict = {}
    
    def update(self, changed=None):
        """Ensure no duplicate colors and record changes"""
        for parrot in self:
            used_colors = [parrot.color for parrot in self]
            available_colors = [color for color in self.colors
                if color not in used_colors]
            if (parrot is not changed and 
                used_colors.count(parrot.color) > 1):          	
                parrot.color = available_colors[0]	
            self.state_dict[parrot] = parrot.color
                
    def change(self, parrot, color):
	"""Change color and update"""
        self[self.index(parrot)].color = color
        self.update(parrot)

This list knows when a parrot has had its color changed by calling change() on 
the list, and makes sure no parrots are the same color by changing any 
parrots of duplicate color. It has a state_dict attribute  (redundant in this 
example) which keeps track of the colors after an update. (My version of the 
update method updates the whole list). 

The trick is to have the method that changes the elements of the list defined 
in the list class definition, rather than that of the elements' class, that 
way it's easy for the list to know about changes to its elements.

(If a parrots color is changed directly, update() will still ensure unique 
colors, but will not preserve the change unless that parrot is given as an 
argument.)

For example:

polly = Parrot('polly')
molly = Parrot('molly')
dolly = Parrot('dolly')

salp = SelfAwareListOfParrots([polly, molly, dolly])

print salp.state_dict

>>>{molly: 'yellow', polly: 'white', dolly: 'black'}

salp.change(polly, 'black')

print salp.state_dict

>>>{molly: 'yellow', polly: 'black', dolly: 'white'}

As for the subclassing of list, that allows you to create a class with all the 
methods of a list, to which you can add your own. (Although any list methods 
which return a new list will return a list, not an instance of your class, 
unless you define them to do so in your class definition). 

In my post quoted above, by "i.state" I was probably abusing the term "state" 
to signify "some arbitrary attribute" of i.

I'm pretty new to this stuff, but there are plenty of tutorials on it out 
there, and I'm relying on others to correct any fallacies I may be 
unwittingly propagating here. :)

Regards,

John


From aleksandr.goretoy at gmail.com  Mon Feb  9 01:48:27 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Mon, 9 Feb 2009 00:48:27 -0600
Subject: GAE open()
Message-ID: <fa98a9e30902082248v7190dafm28f79501a325e317@mail.gmail.com>

Hello,

How to open binary file for writing into datastore. I'm trying to loop over
listdir output of images directory, How to do this without using

self.request.POST.get.file.read(), or rather how to loop this task in app
engine

file(os.curdir+"somefile").read()

UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position
14: ordinal not in range(128)

but when I try to read binary with b, I get IOError.


    raise IOError('invalid mode: %s' % mode)
IOError: invalid mode: b

-Alex Goretoy
http://www.alexgoretoy.com
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From greg.ewing at canterbury.ac.nz  Mon Feb  9 01:51:46 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 09 Feb 2009 19:51:46 +1300
Subject: Python binaries with VC++ 8.0?
Message-ID: <6va201FijdteU1@mid.individual.net>

Is there anywhere I can download a set of Python
binaries, of any version, that have been built
with Visual C++ 8.0?

I'm trying to hook Python up to Sketchup 7 on
Windows, and I think I'm having problems because
Sketchup is linked with msvcr80.dll.

-- 
Greg


From Bornstub at gmail.com  Mon Feb  9 01:52:05 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Sun, 8 Feb 2009 22:52:05 -0800 (PST)
Subject: How to debug deadlock?
Message-ID: <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30@r10g2000prf.googlegroups.com>

Hi,

I am developing a multi-threading application, I encounter a deadlock.
I use Visual C++ Express 2008 to trace the program. Once the deadlock
occurs, I just pause the program and trace. I found that when deadlock
occurs, there will be two threads called python from my C++ extension.
All of them use Queue in python code, so I guess the deadlock might
caused by Queue. But however, once the extension goes into python
code, I can't see nothing but asm code and binary from the VC++
debugger. I would like to know are there any way to dump the call
stack of python code after I paused the program? And how can I know
what lock are there in threads caused the deadlock?

Thanks.
Victor Lin.


From r.warhekar at gmail.com  Mon Feb  9 02:04:49 2009
From: r.warhekar at gmail.com (Rahul)
Date: Sun, 8 Feb 2009 23:04:49 -0800 (PST)
Subject: adodb has no attribute connect
Message-ID: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>

Hello all,

I have to access data from database using adodb so I did

Import adodb
Conn=adodb.NewADOConnection("odbc")

Upto this it works properly but when I say

Conn.Connect("","","")

It gives error as

[Attributrerror]: Object Nonetype has no attribute Connect.

I have Red Hat Enterprise Linux 4
Python 2.5
Mod_python 3.3.1

The same is also not working from python console

Please guide me through this.


From pavlovevidence at gmail.com  Mon Feb  9 02:14:52 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 8 Feb 2009 23:14:52 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
Message-ID: <17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>

On Feb 8, 10:51?pm, Greg Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Is there anywhere I can download a set of Python
> binaries, of any version, that have been built
> with Visual C++ 8.0?
>
> I'm trying to hook Python up to Sketchup 7 on
> Windows, and I think I'm having problems because
> Sketchup is linked with msvcr80.dll.

I'm pretty sure 2.6.1 is compiled with 8.0.  However, I think the
Visual C++ 8.0 uses msvcrt90.dll.

Take a look at this bug report to see if it's related to your issue:

http://bugs.python.org/issue4566


Carl Banks


From stefan_ml at behnel.de  Mon Feb  9 02:20:35 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 09 Feb 2009 08:20:35 +0100
Subject: ElementTree and clone element toot
In-Reply-To: <gmn1e5$3eh$1@panix3.panix.com>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gmn1e5$3eh$1@panix3.panix.com>
Message-ID: <498fd943$0$32667$9b4e6d93@newsspool2.arcor-online.net>

Aahz wrote:
> In article <4986bfd7$0$9385$ba4acef3 at news.orange.fr>,
> m.banaouas <banaouas.medialog at wanadoo.fr> wrote:
>> Working with the ElementTree module, I looked for clone element
>> function but not found such tool:
> 
> Have you tried using copy.deepcopy()?

While being the most obvious solution, calling deepcopy() on an Element is
surprisingly slow in ElementTree.

http://codespeak.net/lxml/performance.html#deepcopy

It's actually multiple times faster to rebuild the tree manually through
the API than to let deepcopy() do it. Fredrik also has written a little
factory for mass reproduction of Element trees.

http://effbot.python-hosting.com/file/stuff/sandbox/elementlib/clone.py

Stefan


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 02:26:33 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 09 Feb 2009 07:26:33 GMT
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
	<838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>
Message-ID: <pan.2009.02.09.07.26.34@REMOVE.THIS.cybersource.com.au>

On Sun, 08 Feb 2009 13:34:50 -0800, bearophileHUGS wrote:

> Gabriel Genellina:
>> bearophile:
>> > - Generally I suggest to learn to code in the small, using as little
>> > code as possible.
>>
>> I completely agree with all the above suggestions, except this last
>> one. Ok, I think I know what you mean, but a beginner might understand
>> this completely wrong. Readability is important, and trying to compress
>> too much code into one single line should not be the ultimate goal.
> 
> What I meant is to use less code as possible, keeping readability and
> the original flexibility.

I think a better description is, use as little code as you need, and no 
extra, but no less. As Einstein said about physics theories: "As simple 
as possible, but no simpler."


> I can't stress enough the importance of writing less code. Every new
> programmer has to learn how much important it is. Less code means less
> bugs, less lines to edit and debug, etc. 

[pedant]
There's less code, fewer bugs and lines. Less applies to continuous 
quantities, like weight and "amount of code", and fewer applies to 
countable quantities.

Don't worry, I frequently get it wrong too, and I'm a native English 
speaker :)


> Less code is usually more
> elegant, and often more readable (even if you take 3 times to read each
> line it may be good anyway if you have 1/10 of the lines of code.
> Recently in the "Java to Python" thread someone has posted some Java
> class that is scary, you can probably write the same thing in 1/10-1/20
> of the lines of code).

Within reason, naturally. There's a reason why we write:

for button in buttons:
    move(button, delta_x, delta_y)

instead of

for b in bs: mv(b, x, y)

even though the second is significantly shorter. Keyword arguments versus 
positional arguments is another example where more verbose code is easier 
to read and maintain than shorter code.


Also, I don't think there's much advantage in trying to push new 
programmers to reduce the amount of code. Until you're really comfortable 
with the language, you need training wheels and scaffolding in the form 
of verbose code. Sometimes you really don't appreciate Python's labour 
saving features until you've experienced how much labour there is to be 
saved.


-- 
Steven


From mail at microcorp.co.za  Mon Feb  9 02:40:07 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 9 Feb 2009 09:40:07 +0200
Subject: Importing a file (not a module).
References: <1234152106.498faaaa97f1d@mail.uh.cu>
Message-ID: <000301c98a8c$c7d74c00$0d00a8c0@hendrik>

"Luis Zarrabeitia" <ky..e at u...cu> wrote:

>Is there any way to "import" a .py file that is not on sys.path?
>I'd like to 'import' a file that resides somewhere on my filesystem without
>having to add it's directory to sys.path. At first, I thought that something
like
>
>my_module = __import__("path/to/file")
>
>would work, but I was mistaken. Ideally, the path would be specified as a
>relative path from the importer's module, and not from the CWD (that's another
>question, I guess).

I have used execfile(RelativeFromCWDOrAbsolutePathToTheFile) to do
this sort of thing. But beware - it does not create a module, so it's a bit
like:

from something import *

This may or may not be useful in your case.

- Hendrik




From cournape at gmail.com  Mon Feb  9 02:48:12 2009
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 9 Feb 2009 16:48:12 +0900
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
Message-ID: <5b8d13220902082348h7b37c045veea3f678b814fe5f@mail.gmail.com>

On Mon, Feb 9, 2009 at 4:14 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On Feb 8, 10:51 pm, Greg Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> Is there anywhere I can download a set of Python
>> binaries, of any version, that have been built
>> with Visual C++ 8.0?
>>
>> I'm trying to hook Python up to Sketchup 7 on
>> Windows, and I think I'm having problems because
>> Sketchup is linked with msvcr80.dll.
>
> I'm pretty sure 2.6.1 is compiled with 8.0.

Hm, I have just run python to check: it is built with MSC v.1500,
which corresponds to VS 2008, e.g. VS 9, at least on 32 bits.

David


From mail at microcorp.co.za  Mon Feb  9 02:48:55 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 9 Feb 2009 09:48:55 +0200
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <000401c98a8c$c86e5be0$0d00a8c0@hendrik>

"cptn.spoon" <cp....on at gmail.com> wrote:

On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:

>Thanks Paul! I thought this might be the case. So how would I get the
>StockMarket class instance to contain many Stock class instances and
>then be able to iterate through them? I'm guessing the basic structure
>would be as follows...but I think I'm wrong:
>
>class StockMarket:
>  pass

No.
At this level, just use a list of instances of your Stock class.

- Hendrik




From rodmena.com at gmail.com  Mon Feb  9 04:05:19 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Mon, 9 Feb 2009 01:05:19 -0800 (PST)
Subject: Local python web server problem
Message-ID: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>

Hi everyone. I have started to develop a web base software for
renderfarm managing.
I run the cherrypy hello world! example and when I visit
127.0.0.1:8080
on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
local network is 192.168.100.18
but when I visit 192.168.100.18, there is another page: "It Works!".
What is "It Works!"? and when I type 192.168.100.18:8080 in another
local pc, the page didn't load?

Sorry I am newbie in network area, so I have these two questions:
1- How can I serve my page in local network?
2- what is "It Works!" in 192.168.100.18? we have
192.168.100.<10-70> . no pc has this but mine!!!

3- Could you please explain me or at least point me to the right
direction of making little local web server, localhost?

4- How can I access to the server that serves web page in 56566 port?
I try 192.168.100.18:56566
but the page could not load. I can ping 192.168.100.18 but I can't
load web pages from it.
Why?


Thanks and sorry for my bad English.


From skippy.hammond at gmail.com  Mon Feb  9 04:32:22 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Mon, 09 Feb 2009 20:32:22 +1100
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <6va201FijdteU1@mid.individual.net>
References: <6va201FijdteU1@mid.individual.net>
Message-ID: <498FF826.50008@gmail.com>

On 9/02/2009 5:51 PM, Greg Ewing wrote:
> Is there anywhere I can download a set of Python
> binaries, of any version, that have been built
> with Visual C++ 8.0?

IIRC, no.  Python skipped that version of MSVC.  I believe Python 2.5 
builds easily with vc8 project files in svn though.

> I'm trying to hook Python up to Sketchup 7 on
> Windows, and I think I'm having problems because
> Sketchup is linked with msvcr80.dll.

What problems specifically?  The only practical problems you should see 
will arise if you try and pass a "FILE *", or allocate memory you then 
ask python to free (or vice-versa) - both should be avoidable though...

Mark


From research at johnohagan.com  Mon Feb  9 04:43:36 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 9 Feb 2009 09:43:36 +0000
Subject: Small socket problem
Message-ID: <200902090943.36445.research@johnohagan.com>

Hi, 

I'm using the socket module (python 2.5) like this (where 'options' refers to 
an optparse object) to connect to the Fluidsynth program:

            host = "localhost"
            port = 9800
            fluid = socket(AF_INET, SOCK_STREAM)
            try:
                fluid.connect((host, port))  #Connect if fluidsynth is running
            except BaseException:
                print "Connecting to fluidsynth..." #Or start fluidsynth
                soundfont =  options.soundfont
                driver = options.driver
                Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
                "-C", "1",  "-R", "1", "-l", "-a", driver, "-j", soundfont])
                timeout = 50
                while 1:
                    timeout -= 1
                    if timeout == 0:
                        print "Problem with fluidsynth: switching to synth."
                        play_method = "synth"
                        break
                    try:
                        fluid.connect((host, port))
                    except BaseException:
                        sleep(0.05)
                        continue
                    else:
                        break

(I'm using BaseException because I haven't been able to discover what 
exception class[es] socket uses).

The problem is that this fails to connect ( the error is "111: Connection 
refused") the first time I run it after booting if fluidsynth is not already 
running, no matter how long the timeout is; after Ctrl-C'ing out of the 
program, all subsequent attempts succeed. Note that fluidsynth need not be 
running for a success to occur. 

I've also tried it without the while loop, simply sleeping for a few seconds 
to give fluidsynth time to start (not a preferred approach as I want a short 
startup), but the same thing happens.

I am a long way from being a networking guru and am at a loss as to how to 
debug this. Maybe someone can point out some flaw in my use of socket.

Thanks,

John O'Hagan


From Ron.Barak at lsi.com  Mon Feb  9 04:51:45 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 9 Feb 2009 09:51:45 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
	<mailman.9087.1234101684.3487.python-list@python.org>
	<ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>

Hi John,

Thanks for the suggestion.

What I do now in preparation for pickling is:

            for_pickle_log_stream = LogStream(sac_log_file)
            for key in log_stream.__dict__:
                if key != "input_file":
                    for_pickle_log_stream.__dict__[key] = log_stream.__dict__[key]
            del for_pickle_log_stream.__dict__["input_file"]

(i.e., log_stream is the source instance, and for_pickle_log_stream is the target)

So, it seems to be in agreement with your suggestion.

Thanks and bye,
Ron.

-----Original Message-----
From: John Machin [mailto:sjmachin at lexicon.net]
Sent: Sunday, February 08, 2009 23:04
To: python-list at python.org
Subject: Re: How to copy an instance without its cStringIO.StringO item ?

On Feb 9, 1:01 am, Christian Heimes <li... at cheimes.de> wrote:
> Barak, Ron schrieb:
>
> > Hi,
>
> > I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> > I do not need the cStringIO.StringO in the target object.
> > The target instance is to be pickled.
>
> > Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
>
> > However, trying to use copy.deepcopy produced: TypeError:
> > object.__new__(cStringIO.StringO) is not safe, use
> > cStringIO.StringO.__new__()
>
> > Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
>
> > If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
>
> > Can you suggest a better way ?
>
> You can overwrite some functions in order to omit attributes from a
> pickle. It's all documented athttp://docs.python.org/library/pickle.html#pickling-and-unpickling-no...

If there is no chance that some other thread could be accessing the source object, can't the OP just do:
    temp = source.stringio
    del source.stringio
    # make a pickle from source
    source.stringio = temp
?




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From bearophileHUGS at lycos.com  Mon Feb  9 04:57:56 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 9 Feb 2009 01:57:56 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
	<838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>
	<pan.2009.02.09.07.26.34@REMOVE.THIS.cybersource.com.au>
Message-ID: <fefa68ea-3dcf-4694-9fde-9a9508bb2821@l16g2000yqo.googlegroups.com>

Steven D'Aprano:
> There's less code, fewer bugs and lines. Less applies to continuous
> quantities, like weight and "amount of code", and fewer applies to
> countable quantities.

Thank you, I'll try to improve my use of the language.


> Within reason, naturally. There's a reason why we write:
> for button in buttons:
> ? ? move(button, delta_x, delta_y)
> instead of
> for b in bs: mv(b, x, y)
> even though the second is significantly shorter.

Often Shortening names and packing more stuff in single lines that
deserve to be two lines aren't good ways to shorten code.


> Also, I don't think there's much advantage in trying to push new
> programmers to reduce the amount of code. Until you're really comfortable
> with the language, you need training wheels and scaffolding in the form
> of verbose code. Sometimes you really don't appreciate Python's labour
> saving features until you've experienced how much labour there is to be
> saved.

I don't agree. When you learn to code you also have to learn what does
it mean to write "good code", you have to learn that there are several
things that are important beside writing a correct output, like good
comments, well thought out names, good indentation, good idioms, quick
running time, small memory usage, writing clear and readable code, and
later develop elegance, the power of composition, abstraction,
indirection, meta programming, etc. Among such things there's the
importance of writing short programs. All such things are the seeds
that will develop into the personal style of the future programmer.

Such things are also useful for another purpose: to help the student
understand that code is craftsmanship, so she/he/shi can (and is
supposed to) be proud of the code that writes. This helps the student
understand that programming isn't just an ugly way to tell orders to a
moronic CPU, that helps develop appreciation for the act of writing
code, because it becomes something you do also for the sake of it, as
you do art, beside for usefulness. So you have to teach and show such
things from more or less the beginning.

Bye,
bearophile


From clp2 at rebertia.com  Mon Feb  9 05:13:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 02:13:00 -0800
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <50697b2c0902090213s193576f5w58430c4a2e7ee07d@mail.gmail.com>

On Tue, Feb 10, 2009 at 2:03 AM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code:
> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')

Why are you opening the file in binary mode? It's content is text!

>
> def readLines():
>
>        for line in file.read():

.read() reads the *entire* file into a string. When you iterate over a
string, such as in a for-loop, you get *individual characters*,
whereas you appear to want lines of text. To go line-by-line, use `for
line in file` instead (note: `line` will include the trailing newline
at the end of each line).
And don't use `file` as a variable name; it shadows the name of the
buitlin type.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sjmachin at lexicon.net  Mon Feb  9 05:28:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 09 Feb 2009 21:28:17 +1100
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
	<mailman.9087.1234101684.3487.python-list@python.org>
	<ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
	<7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>
Message-ID: <49900541.6090509@lexicon.net>

On 9/02/2009 8:51 PM, Barak, Ron wrote:
> Hi John,
> 
> Thanks for the suggestion.
> 
> What I do now in preparation for pickling is:
> 
>             for_pickle_log_stream = LogStream(sac_log_file)   
>             for key in log_stream.__dict__:
>                 if key != "input_file":
>                     for_pickle_log_stream.__dict__[key] = 
> log_stream.__dict__[key]
>             del for_pickle_log_stream.__dict__["input_file"]   
> 
> (i.e., log_stream is the source instance, and for_pickle_log_stream is 
> the target)
> 
> So, it seems to be in agreement with your suggestion.

which was
"""
  If there is no chance that some other thread could be accessing the
  source object, can't the OP just do:
      temp = source.stringio
      del source.stringio
      # make a pickle from source
      source.stringio = temp
"""
which I regard as radically different to your approach; please explain 
what you mean by "in agreement with".




From sjmachin at lexicon.net  Mon Feb  9 05:47:03 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 9 Feb 2009 02:47:03 -0800 (PST)
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
	<mailman.9133.1234174389.3487.python-list@python.org>
Message-ID: <2c44fc1d-54bc-40f9-9d7c-3c5031c4489d@a39g2000prl.googlegroups.com>

On Feb 9, 9:13?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 10, 2009 at 2:03 AM, Joel Ross <jo... at cognyx.com> wrote:
> > Hi all,
>
> > I have this piece of code:
> > #########################################################################
>
> > wordList = "/tmp/Wordlist"
> > file = open(wordList, 'r+b')
>
> Why are you opening the file in binary mode? It's content is text!
>
>
>
> > def readLines():
>
> > ? ? ? ?for line in file.read():
>
> .read() reads the *entire* file into a string. When you iterate over a
> string, such as in a for-loop, you get *individual characters*,
> whereas you appear to want lines of text. To go line-by-line, use `for
> line in file` instead (note: `line` will include the trailing newline
> at the end of each line).
> And don't use `file` as a variable name; it shadows the name of the
> buitlin type.
>

Changed as suggested above, with further comments:

wordList = "/tmp/Wordlist"
f = open(wordList, 'r')
def readLines():
## There is no point in putting the next four lines
## inside a function if you are going to call the
## function (a) immediately and (b) once only.
## All it does is provide scope for unwanted complications.
   for line in f:
        line = line.rstrip('\n')
        print line + '.com '
## Complications like this next line; why is it returning "line"??
## And why is it indented like that?
## It will cause only the first line to be read.
        return line
## Maybe you you meant it to be here:
    return
## But then it's redundant because a function returns anyway
## when flow of control would fall off the bottom.
readLines()
f.close()

HTH,
John


From pete.forman at westerngeco.com  Mon Feb  9 06:45:34 2009
From: pete.forman at westerngeco.com (Pete Forman)
Date: Mon, 09 Feb 2009 11:45:34 +0000
Subject: Tkinter w.pack()?
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>
	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>
	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>
	<mailman.8272.1233232075.3487.python-list@python.org>
	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>
	<mailman.8488.1233440963.3487.python-list@python.org>
	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
	<mailman.8992.1233938703.3487.python-list@python.org>
	<Jnijl.16292$yr3.5511@nlpi068.nbdc.sbc.com>
Message-ID: <bptbvnoh.fsf@wgmail2.gatwick.eur.slb.com>

"W. eWatson" <notvalid2 at sbcglobal.net> writes:

 > MRAB wrote:
>> W. eWatson wrote:
 > ...
>>> I thought some months ago, I found Google commands that would
>>> operate in the browser link window. Guess not.
>>>
>>> BTW, isn't there an O'Reilly book on Google hacks of this sort? 
>>> Where else does one find out about these Google tools?
>>>
>> Google? :-)
>> http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861
>>
 > Thanks. I may have that book marked from many, many months ago. If so,
 > I see why I'd never find it. The BM entry does not show "Google". It
 > does now. ;-)

As well as the site: modifier check out inurl: and friends.

  http://www.google.com/help/operators.html

-- 
Pete Forman                -./\.-  Disclaimer: This post is originated
WesternGeco                  -./\.-   by myself and does not represent
pete.forman at westerngeco.com    -./\.-   the opinion of Schlumberger or
http://petef.22web.net           -./\.-   WesternGeco.


From psaffrey at googlemail.com  Mon Feb  9 07:12:29 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 04:12:29 -0800 (PST)
Subject: Which core am I running on?
Message-ID: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>

Is there some way I can get at this information at run-time? I'd like
to use it to tag diagnostic output dumped during runs using Parallel
Python.

Peter


From gh at ghaering.de  Mon Feb  9 07:20:16 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:20:16 +0100
Subject: Local python web server problem
In-Reply-To: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
Message-ID: <gmp720$4lv$1@ger.gmane.org>

Farsheed Ashouri wrote:
> Hi everyone. I have started to develop a web base software for
> renderfarm managing.
> I run the cherrypy hello world! example and when I visit
> 127.0.0.1:8080
> on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
> local network is 192.168.100.18
> but when I visit 192.168.100.18, there is another page: "It Works!".
> What is "It Works!"? and when I type 192.168.100.18:8080 in another
> local pc, the page didn't load? [...]

Services like HTTP servers "bind" not only to a port, but to a
combination of IP address and port.

The CherryPy tutorial configuration

http://www.cherrypy.org/browser/trunk/cherrypy/tutorial/tutorial.conf

binds to 127.0.0.1 and 8080. This means the application can only be
accessed from the local machine.

To bind to all network interfaces, (i. e. Ethernet etc., and not just
the loopback device), you can change server.socket_host to "0.0.0.0".

-- Gerhard



From gh at ghaering.de  Mon Feb  9 07:22:56 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:22:56 +0100
Subject: Which core am I running on?
In-Reply-To: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
Message-ID: <gmp76v$4lv$2@ger.gmane.org>

psaffrey at googlemail.com wrote:
> Is there some way I can get at this information at run-time? I'd like
> to use it to tag diagnostic output dumped during runs using Parallel
> Python.

There should be a way, but not with the Python standard library. It's
also platform-specific. What are you using? Linux, MacOS X, FreeBSD,
Solaris, or maybe Windows?

-- Gerhard



From gh at ghaering.de  Mon Feb  9 07:24:23 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:24:23 +0100
Subject: Which core am I running on?
In-Reply-To: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
Message-ID: <gmp79n$4lv$3@ger.gmane.org>

psaffrey at googlemail.com wrote:
> Is there some way I can get at this information at run-time? I'd like
> to use it to tag diagnostic output dumped during runs using Parallel
> Python.

Looks like I have answered a similar question once, btw. ;-)

http://objectmix.com/python/631346-parallel-python.html

-- Gerhard



From psaffrey at googlemail.com  Mon Feb  9 08:04:59 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:04:59 -0800 (PST)
Subject: Which core am I running on?
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
	<mailman.9136.1234182305.3487.python-list@python.org>
Message-ID: <84742d3d-6cb5-434b-8a33-2e571e34be70@j1g2000yqi.googlegroups.com>

On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
> Looks like I have answered a similar question once, btw. ;-)
>

Ah, yes - thanks. I did Google for it, but obviously didn't have the
right search term.

Cheers,

Peter


From psaffrey at googlemail.com  Mon Feb  9 08:11:23 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:11:23 -0800 (PST)
Subject: Too many open files
Message-ID: <7cb40acb-fbfe-420c-bc9e-be9765bc8d53@o11g2000yql.googlegroups.com>

I'm building a pipeline involving a number of shell tools. In each
case, I create a temporary file using tempfile.mkstmp() and invoke a
command ("cmd < /tmp/tmpfile") on it using subprocess.Popen.

At the end of each section, I call close() on the file handles and use
os.remove() to delete them. Even so I build up file descriptors that
eventually give me the "too many files" error message. Am I missing
something here?

Peter


From lihang9999 at gmail.com  Mon Feb  9 08:13:10 2009
From: lihang9999 at gmail.com (Li Han)
Date: Mon, 9 Feb 2009 05:13:10 -0800 (PST)
Subject: convert the ip packet to and from RS-232 packet
Message-ID: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>

Hi, I need to use radio to connect two local ip network, each local
network has a server computer which connects to a radio with RS-232
interface.  I need to write a program to convert the local ip packet
into RS-232 packet, so the radio can send packetes to the remote
radio. I don't want to reinvent the wheel, is there anyone could give
me some suggestions?
Thank you!
Han


From eckhardt at satorlaser.com  Mon Feb  9 08:17:21 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 09 Feb 2009 14:17:21 +0100
Subject: Too many open files
References: <7cb40acb-fbfe-420c-bc9e-be9765bc8d53@o11g2000yql.googlegroups.com>
Message-ID: <30n566-q6r.ln1@satorlaser.homedns.org>

psaffrey at googlemail.com wrote:
> I'm building a pipeline involving a number of shell tools. In each
> case, I create a temporary file using tempfile.mkstmp() and invoke a
> command ("cmd < /tmp/tmpfile") on it using subprocess.Popen.
> 
> At the end of each section, I call close() on the file handles and use
> os.remove() to delete them. Even so I build up file descriptors that
> eventually give me the "too many files" error message. Am I missing
> something here?

There recently was a bug filed at bugs.python.org about leaked file
descriptors. Maybe that is exactly what you are experiencing here.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From pobega at gmail.com  Mon Feb  9 08:23:21 2009
From: pobega at gmail.com (Michael Pobega)
Date: Mon, 9 Feb 2009 08:23:21 -0500
Subject: wxPython vs Glade?
Message-ID: <20090209132321.GA30754@greedo>

I'm looking for opinions on the best toolkit for a beginner to use with
wxPython. It doesn't necessarily need to be the most efficient toolkit,
but something I can use for basic programs (a Twitter client, Wordpress
blogging client, etc) just to learn Python.

wxWidgets seems nice because it's portable, but I'm not sure how many of
my libraries are portable (a lot of them seem to import os), while Glade
seems extremely simple to make a UI (but does the program end up relying
on Glade? Or can I build it directly into GTK+?)

-- 
		  http://pobega.wordpress.com
		    http://identica/pobega
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From steve at holdenweb.com  Mon Feb  9 08:29:06 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 09 Feb 2009 08:29:06 -0500
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <gmpb3e$g68$1@ger.gmane.org>

Li Han wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?
> Thank you!

There's a package called pyserial that's pretty good at handling RS-232
interfaces. Good luck!

regards
 Steve
(G3VEK)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From benjamin.kaplan at case.edu  Mon Feb  9 08:30:13 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 9 Feb 2009 08:30:13 -0500
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>

On Mon, Feb 9, 2009 at 8:23 AM, Michael Pobega <pobega at gmail.com> wrote:

> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>


wxPython is the toolkit. It provides Python wrappers for wxWidgets. I think
you are looking at wxGlade, a UI designer for wx based off of the Gnome UI
builder. It's not a toolkit..

>
> --
>                  http://pobega.wordpress.com
>                    http://identica/pobega
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
>
> iEYEARECAAYFAkmQLkkACgkQxgy5R7EobNd/vwCfeDdaeX6YyNxcCZ11pmbWMPZj
> akwAn2LCb3Qz2lLKZLF3DG4j5lTBOQdd
> =/Bfe
> -----END PGP SIGNATURE-----
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at holdenweb.com  Mon Feb  9 08:34:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 09 Feb 2009 08:34:12 -0500
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <gmpbd0$g68$2@ger.gmane.org>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
> 
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
> 
There's something called PythonCard built on top of wxPython that's
fairly newb-friendly, though it gets clunkier as your demands grow.

You might also want to look at Dabo, which is a much more comprehensive
framework that also hides much of wxPython's complexity.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From tim.wintle at teamrubber.com  Mon Feb  9 08:47:18 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 09 Feb 2009 13:47:18 +0000
Subject: thread. question
Message-ID: <1234187238.7630.34.camel@tim-laptop>

Hi, 
This is my first post here - google hasn't helped much but sorry if this
has been asked before.

I've been wondering about some of the technicalities of locks in python
(2.4 and 2.5 mainly).

I'm using the "old" thread module as (1) I prefer the methods and (2) It
should be a tiny bit faster.

As far as I can see, the thread module is fairly much a direct wrapper
around "PyThread_allocate_lock" etc. - defined in
"thread_pthread.h" (took me ages to find the definitions in a header
file!), so as far as I can tell the implementation is very closely
wrapped around the system's threading implementation. 

Does that mean that every python thread is actually a real separate
thread (for some reason I thought they were implemented in the
interpreter)?

Does that also mean that there is very little extra interpreter-overhead
to using locks (assuming they very infrequently block)? Since if you use
the thread module direct the code doesn't seem to escape from C during
the acquire() etc. or am I missing something important?

Thanks,

Tim Wintle






From s.selvamsiva at gmail.com  Mon Feb  9 08:48:48 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 9 Feb 2009 19:18:48 +0530
Subject: BeautifulSoup -converting unicode to numerical representaion
Message-ID: <b423b9550902090548n48a3c722i526f9b96d155b67a@mail.gmail.com>

Hi all,

I need to parse feeds and post the data to SOLR.I want the special
characters(Unicode char) to be posted as numerical representation,

For eg,
*'* --> &#8217; (for which HTML equivalent is &rsquo;)
I used BeautifulSoup,which seems to be allowing conversion from "&#xxxx;"(
numeric values )to unicode characters as follow,

*hdes=str(BeautifulStoneSoup(strdesc,
convertEntities=BeautifulStoneSoup.HTML_ENTITIES))
xdesc=str(BeautifulStoneSoup(hdes,
convertEntities=BeautifulStoneSoup.XML_ENTITIES))*

But i want *numerical representation of unicode characters.*
I also want to convert html representation like &rsquo; to its numeric
equivalent &#8217;

Thanks in advance.

*Note:*
The reason for the above requirement is i need a standard way to post to
SOLR to avoid errors.
-- 
Yours,
S.Selvam
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From psaffrey at googlemail.com  Mon Feb  9 08:53:10 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:53:10 -0800 (PST)
Subject: Which core am I running on?
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
	<mailman.9136.1234182305.3487.python-list@python.org>
Message-ID: <c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>

On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
> http://objectmix.com/python/631346-parallel-python.html
>

Hmm. In fact, this doesn't seem to work for pp. When I run the code
below, it says everything is running on the one core.

import pp
import random
import time
from string import lowercase

ncpus = 3

def timedCharDump(waittime, char):
	time.sleep(waittime)
	mycore = open("/proc/%i/stat" % os.getpid()).read().split()[39]
	print "I'm doing stuff!", mycore, char
	return char

job_server = pp.Server(ncpus, ppservers=())

jobdetails = [ (random.random(), letter) for letter in lowercase ]

jobs = [ job_server.submit(timedCharDump,(jinput1, jinput2), (),
("os", "time",)) for jinput1, jinput2 in jobdetails ]

for job in jobs:
	print job()


Peter


From tino at wildenhain.de  Mon Feb  9 08:54:09 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 09 Feb 2009 14:54:09 +0100
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <49903581.70409@wildenhain.de>

Hi,

Li Han wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?

You might want to check:

http://en.wikipedia.org/wiki/Packet_radio


some free OS already come with an interface
implemention so all you need would be configuring
that interface and routing appropriately.

As such, not really a python topic.

Regards
Tino
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From vzupka at volny.cz  Mon Feb  9 09:05:01 2009
From: vzupka at volny.cz (=?WINDOWS-1252?Q?Vladim=EDr_=8Eupka?=)
Date: Mon, 9 Feb 2009 15:05:01 +0100
Subject: cannot install
Message-ID: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>

I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python  
3.0 into a folder (/Library/Frameworks/Python.framework) and ran  
commands:

cd /Library/Frameworks/Python.framework/Python-3.0
python setup.py install

and got the message reporting a syntax error:

Macintosh:~ vzupka$ /bin/csh
[Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
[Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python  
setup.py install
   File "setup.py", line 232
     except (CCompilerError, DistutilsError) as why:
                                              ^
SyntaxError: invalid syntax
[Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%

What is the reason and how do I install?

Regards,
Vladim?r ?upka
vzupka at volny.cz





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From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:10:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:10:13 -0200
Subject: Small socket problem
References: <200902090943.36445.research@johnohagan.com>
Message-ID: <op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 07:43:36 -0200, John O'Hagan <research at johnohagan.com>  
escribi?:

> I'm using the socket module (python 2.5) like this (where 'options'  
> refers to
> an optparse object) to connect to the Fluidsynth program:
>
>             host = "localhost"
>             port = 9800
>             fluid = socket(AF_INET, SOCK_STREAM)
>             try:
>                 fluid.connect((host, port))  #Connect if fluidsynth is  
> running
>             except BaseException:
>                 print "Connecting to fluidsynth..." #Or start fluidsynth
>                 soundfont =  options.soundfont
>                 driver = options.driver
>                 Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
>                 "-C", "1",  "-R", "1", "-l", "-a", driver, "-j",  
> soundfont])
>                 timeout = 50
>                 while 1:
>                     timeout -= 1
>                     if timeout == 0:
>                         print "Problem with fluidsynth: switching to  
> synth."
>                         play_method = "synth"
>                         break
>                     try:
>                         fluid.connect((host, port))
>                     except BaseException:
>                         sleep(0.05)
>                         continue
>                     else:
>                         break
>
> (I'm using BaseException because I haven't been able to discover what
> exception class[es] socket uses).

Usually socket.error, which is a subclass of IOError, but others might  
happen too I think. In any case, the most generic except clause you should  
use is
try:
except Exception: ...
(because you usually don't want to catch KeyboardInterrupt nor SystemExit,  
that is, let Ctrl-C and sys.exit() do their work)

> The problem is that this fails to connect ( the error is "111: Connection
> refused") the first time I run it after booting if fluidsynth is not  
> already
> running, no matter how long the timeout is; after Ctrl-C'ing out of the
> program, all subsequent attempts succeed. Note that fluidsynth need not  
> be
> running for a success to occur.

Always the same exception? In both lines?

-- 
Gabriel Genellina



From pobega at gmail.com  Mon Feb  9 09:26:55 2009
From: pobega at gmail.com (Michael Pobega)
Date: Mon, 9 Feb 2009 09:26:55 -0500
Subject: wxPython vs Glade?
In-Reply-To: <ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>
References: <20090209132321.GA30754@greedo>
	<ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>
Message-ID: <20090209142655.GA25349@greedo>

On Mon, Feb 09, 2009 at 08:30:13AM -0500, Benjamin Kaplan wrote:
> On Mon, Feb 9, 2009 at 8:23 AM, Michael Pobega <pobega at gmail.com> wrote:
> 
> > I'm looking for opinions on the best toolkit for a beginner to use with
> > wxPython. It doesn't necessarily need to be the most efficient toolkit,
> > but something I can use for basic programs (a Twitter client, Wordpress
> > blogging client, etc) just to learn Python.
> >
> > wxWidgets seems nice because it's portable, but I'm not sure how many of
> > my libraries are portable (a lot of them seem to import os), while Glade
> > seems extremely simple to make a UI (but does the program end up relying
> > on Glade? Or can I build it directly into GTK+?)
> >
> 
> wxPython is the toolkit. It provides Python wrappers for wxWidgets. I think
> you are looking at wxGlade, a UI designer for wx based off of the Gnome UI
> builder. It's not a toolkit..
> 

No, I'm not. You don't have to argue semantics with me; I'm talking
about using wxPython directly (i.e. with Vim) or using Glade to build an
interface; I'm wondering which makes for the easiest and best end result
code.

-- 
		  http://pobega.wordpress.com
		    http://identica/pobega
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From Scott.Daniels at Acm.Org  Mon Feb  9 09:30:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 09 Feb 2009 06:30:29 -0800
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
	<JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>
Message-ID: <k6adnT4jqdgWoA3UnZ2dnUVZ_vWdnZ2d@pdx.net>

I (Scott David Daniels) wrote:
> chohazel at gmail.com wrote:
>> Is there a way to adjust the default font size in IDLE, in MacPython
>> 2.5? The default now is too tiny.
>> I have to use this version of MacPython. As far as I searched, I can't
>> find how I do this.
> 
> If you can read what you have at all, try to go toHelp (on the top),
> then down in that menu to "Configure IDLE ..."
> There will be a possibly long delay.  Then on the tab in the produced
> window, You can set the Base Editor Font and Size.  I use Tahoma 14.
> Then go click "Ok".  If the display doesn't get better, you might have
> to exit from Idle and restart it.  If this doesn't work, get back to me
> and we can try something more drastic.

Although the OP seems no longer interested,  I'd now advise anyone
interested yo read the entire section on installing VPython (v5) on
OS/X.  It has a very clear set of things to do to get Python 2.5 and
IDLE working.  You can simply skip the steps for downloading and
installing VPython if you like.
     http://www.vpython.org/contents/download_mac.html

As to why it is on vpython.org rather than python.org, VPython is used
in physics courses at a number of universities, and they teach their
classes (to people not necessarily programmers) using IDLE to interact
with and program their physics demos (3-D images that you can mouse
around to change your point of view).

--Scott David Daniels
Scott.Daniels at Acm.Org


From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:34:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:34:13 -0200
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <op.uo29fbpbx6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 08:03:06 -0200, Joel Ross <joelc at cognyx.com> escribi?:

> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
>
>
> def readLines():
>
>          for line in file.read():
>              if not line: break
>              print line + '.com '
>              return line
>
>
>
> readLines()
> file.close()
>
> ##########################################################################
>
> It returns the results:
>
> t.com
>
> NOTE: Only returns the first letter of the first word on the first line  
> e.g. test would only print t and readline() does the same thing.

This should print every line in the file, adding .com at the end:

wordList = "/tmp/Wordlist"
with open(wordList, 'r') as wl:
   for line in wl:
     print line.rstrip() + '.com '

Note that:
- I iterate over the file self; files are their own line-iterators.
- I've used the 'r' mode instead (I assume it's a text file because you  
read it line by line, and as you don't update it, the '+' isn't required)
- the line read includes the end-of-line '\n' at the end; rstrip() removes  
it and any trailing whitespace. If you don't want this, use rstrip('\n')
- I've used the with statement to ensure the file is closed at the end


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:34:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:34:14 -0200
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <op.uo29fcsnx6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 08:03:06 -0200, Joel Ross <joelc at cognyx.com> escribi?:

> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
>
>
> def readLines():
>
>          for line in file.read():
>              if not line: break
>              print line + '.com '
>              return line
>
>
>
> readLines()
> file.close()
>
> ##########################################################################
>
> It returns the results:
>
> t.com
>
> NOTE: Only returns the first letter of the first word on the first line  
> e.g. test would only print t and readline() does the same thing.

This should print every line in the file, adding .com at the end:

wordList = "/tmp/Wordlist"
with open(wordList, 'r') as wl:
   for line in wl:
     print line.rstrip() + '.com '

Note that:
- I iterate over the file self; files are their own line-iterators.
- I've used the 'r' mode instead (I assume it's a text file because you  
read it line by line, and as you don't update it, the '+' isn't required)
- the line read includes the end-of-line '\n' at the end; rstrip() removes  
it and any trailing whitespace. If you don't want this, use rstrip('\n')
- I've used the with statement to ensure the file is closed at the end


-- 
Gabriel Genellina



From icanbob at gmail.com  Mon Feb  9 09:43:28 2009
From: icanbob at gmail.com (bobicanprogram)
Date: Mon, 9 Feb 2009 06:43:28 -0800 (PST)
Subject: convert the ip packet to and from RS-232 packet
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <4cc1a15a-9d20-4b85-ab04-2380cab5b23a@s20g2000yqh.googlegroups.com>

On Feb 9, 8:13 am, Li Han <lihang9... at gmail.com> wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?
> Thank you!
> Han


You might want to check out the SIMPL toolkit. (http://
www.icanprogram.com/simpl).   It come standard with an RS232
surrogate.   This generic module will transparently transmit a SIMPL
message via RS232 serial connection.   Although this module is written
in C,  SIMPL itself fully supports Python as a language to create
modules.

bob


From basu at archlinux.us  Mon Feb  9 09:43:46 2009
From: basu at archlinux.us (member Basu)
Date: Mon, 9 Feb 2009 09:43:46 -0500
Subject: Py2app Py2exe and losing extensibility
Message-ID: <c620ff2d0902090643j4a671bb9ka59ba009d800f8b7@mail.gmail.com>

I'm currently working on a project that allows users to write their own
Python modules as simple extensions (basically output formatters). I would
like to do a cross-platform release and so I'm using PyQt and will be trying
to convert it to native builds using Py2app and Py2xe. I don't want users to
have to install Qt and PyQt to run it. But if I do that, will I still be
able to load Python modules dynamically as extensions ? (assuming that the
user machine has Python installed separately).
Thanks,
Basu
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From bieffe62 at gmail.com  Mon Feb  9 09:54:49 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 9 Feb 2009 06:54:49 -0800 (PST)
Subject: thread. question
References: <mailman.9145.1234188653.3487.python-list@python.org>
Message-ID: <d99327ba-5afa-4f86-925f-e8958b57f577@h20g2000yqn.googlegroups.com>

On Feb 9, 2:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> Hi,
> This is my first post here - google hasn't helped much but sorry if this
> has been asked before.
>
> I've been wondering about some of the technicalities of locks in python
> (2.4 and 2.5 mainly).
>
> I'm using the "old" thread module as (1) I prefer the methods and (2) It
> should be a tiny bit faster.
>
> As far as I can see, the thread module is fairly much a direct wrapper
> around "PyThread_allocate_lock" etc. - defined in
> "thread_pthread.h" (took me ages to find the definitions in a header
> file!), so as far as I can tell the implementation is very closely
> wrapped around the system's threading implementation.
>
> Does that mean that every python thread is actually a real separate
> thread (for some reason I thought they were implemented in the
> interpreter)?
>

I've hever seen the C implementation of python thread, but I know that
python threads
are real OS threads, not 'green threads' inside the interpreter.


> Does that also mean that there is very little extra interpreter-overhead
> to using locks (assuming they very infrequently block)? Since if you use
> the thread module direct the code doesn't seem to escape from C during
> the acquire() etc. or am I missing something important?
>

One significant difference with doing threads in lower level languages
is that in Python the single interpreter instructions
are atomic. This make things a bit safer but also less reactive. It is
especially bad if you use C modules which have function
calls which take long time (bit AFAIK most of IO standard modules have
work around for it),
because your program will not change thread until the C function
returns.
The reason - or one of the reasons - for this is that the python
threads share the interpreter, which is locked
by a thread before execution of a statement and released at the end
(  this is the 'Global Interpreter Lock' or GIL of
which you probably found many references if you googled for python
threads ). Among the other things, this seem to mean that
a multi-threaded python application cannot take full advantage of
multi-core CPUs (but the detailed reason for that escapes me...).

For these reasons, on this list, many suggest that if you have real-
time requirements, probably you should consider using
sub-processes instead of threads.
Personally I have used  threads a few times, although always with
very  soft real-time requirements, and I have never been bitten by the
GIL (meaning that anyway I was able top meet my timing requirements).
So, to add another achronym to my post, YMMV.


> Thanks,
>
> Tim Wintle

Ciao
----
FB


From lists at cheimes.de  Mon Feb  9 09:59:05 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 15:59:05 +0100
Subject: thread. question
In-Reply-To: <1234187238.7630.34.camel@tim-laptop>
References: <1234187238.7630.34.camel@tim-laptop>
Message-ID: <gmpgbp$60o$1@ger.gmane.org>

Tim Wintle schrieb:
> Hi, 
> This is my first post here - google hasn't helped much but sorry if this
> has been asked before.
> 
> I've been wondering about some of the technicalities of locks in python
> (2.4 and 2.5 mainly).
> 
> I'm using the "old" thread module as (1) I prefer the methods and (2) It
> should be a tiny bit faster.

You shouldn't use the thread module directly. It's not meant to be used
by a user. Please stick to the threading module. You won't notice a
slowdown, trust me :)

> As far as I can see, the thread module is fairly much a direct wrapper
> around "PyThread_allocate_lock" etc. - defined in
> "thread_pthread.h" (took me ages to find the definitions in a header
> file!), so as far as I can tell the implementation is very closely
> wrapped around the system's threading implementation. 

The header files Python/thread_*.h contain the interface to your
system's threading libraries. One of the files is included conditionally
depending on your OS.

> Does that mean that every python thread is actually a real separate
> thread (for some reason I thought they were implemented in the
> interpreter)?

Yes, Python uses native threads, not green threads. However Python pure
code can't utilize more than one CPU per process. On order to use
multiple CPUs you have to use multiple processes or use C code that
doesn't use any Python API. Google for "GIL" if you are interested in
more information.

> Does that also mean that there is very little extra interpreter-overhead
> to using locks (assuming they very infrequently block)? Since if you use
> the thread module direct the code doesn't seem to escape from C during
> the acquire() etc. or am I missing something important?

You are correct. The overhead is minimal.

Christian



From exarkun at divmod.com  Mon Feb  9 10:02:06 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:02:06 -0500
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <20090209150206.12853.1379007984.divmod.quotient.7849@henry.divmod.com>

On Mon, 9 Feb 2009 05:13:10 -0800 (PST), Li Han <lihang9999 at gmail.com> wrote:
>Hi, I need to use radio to connect two local ip network, each local
>network has a server computer which connects to a radio with RS-232
>interface.  I need to write a program to convert the local ip packet
>into RS-232 packet, so the radio can send packetes to the remote
>radio. I don't want to reinvent the wheel, is there anyone could give
>me some suggestions?

You can proxy between any two kinds of connection pretty easily with
Twisted (untested):

    from twisted.internet import serialport, protocol, reactor
    from twisted.protocols import portforward

    class SerialPortServer(portforward.Proxy):
        def connectionMade(self):
            # Stop the server, since only one thing can talk to the serial port
            # at a time.
            tcpPort.stopListening()

            # Hook up the proxy between this TCP connection and the serial port.
            self.peer = portforward.Proxy()
            self.peer.setPeer(self)
            self._serialPort = serialport.SerialPort(self.peer, '/dev/ttyS0', reactor)

    factory = protocol.ServerFactory()
    factory.protocol = SerialPortServer
    tcpPort = reactor.listenTCP(12345, factory)
    reactor.run()

Jean-Paul


From jasiu85 at gmail.com  Mon Feb  9 10:02:28 2009
From: jasiu85 at gmail.com (Jasiu)
Date: Mon, 9 Feb 2009 07:02:28 -0800 (PST)
Subject: version in setup.cfg
Message-ID: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>

Hi guys,

I have a question about setup.py and setup.cfg:

I work in a company and we use Subversion to keep our stuff. We have a
post-commit rule that does the following: whenever there is a commit
to /tags/ directory, a binary package is built automatically. The
tag's name is the new version of the package, i.e. tag names are
something like /tags/1.5.2, /tags/1.2.3 etc. We use setup.py to create
packages. In setup.py we set the version of the package by specifying
'version' keyword argument to setup function. We have automated builds
and our post-commit script does kind of ugly regexp hack and replaces
string "version='...'" with version that is guessed from the tag name.
And I wonder: It would be much cleaner if the version could be placed
in the setup.cfg file. Is that possible?

Thanks,

Mike


From gagsl-py2 at yahoo.com.ar  Mon Feb  9 10:14:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 13:14:17 -0200
Subject: Py2app Py2exe and losing extensibility
References: <c620ff2d0902090643j4a671bb9ka59ba009d800f8b7@mail.gmail.com>
Message-ID: <op.uo3a931rx6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 12:43:46 -0200, member Basu <basu at archlinux.us>  
escribi?:

> I'm currently working on a project that allows users to write their own
> Python modules as simple extensions (basically output formatters). I  
> would
> like to do a cross-platform release and so I'm using PyQt and will be  
> trying
> to convert it to native builds using Py2app and Py2xe. I don't want  
> users to
> have to install Qt and PyQt to run it. But if I do that, will I still be
> able to load Python modules dynamically as extensions ? (assuming that  
> the
> user machine has Python installed separately).

I don't know about py2app but if you use py2exe your users still can  
provide their own modules. And they don't have to install Python  
separately (asuming that your "private" one contains all the library  
modules they want to use)
I don't understand your concerns about installing Qt/PyQt.

-- 
Gabriel Genellina



From exarkun at divmod.com  Mon Feb  9 10:24:47 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:24:47 -0500
Subject: Small socket problem
In-Reply-To: <200902090943.36445.research@johnohagan.com>
Message-ID: <20090209152447.12853.1924354689.divmod.quotient.7857@henry.divmod.com>

On Mon, 9 Feb 2009 09:43:36 +0000, John O'Hagan <research at johnohagan.com> wrote:
>Hi,
>
>I'm using the socket module (python 2.5) like this (where 'options' refers to
>an optparse object) to connect to the Fluidsynth program:
>
>            host = "localhost"
>            port = 9800
>            fluid = socket(AF_INET, SOCK_STREAM)
>            try:
>                fluid.connect((host, port))  #Connect if fluidsynth is running
>            except BaseException:
>                print "Connecting to fluidsynth..." #Or start fluidsynth
>                soundfont =  options.soundfont
>                driver = options.driver
>                Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
>                "-C", "1",  "-R", "1", "-l", "-a", driver, "-j", soundfont])
>                timeout = 50
>                while 1:
>                    timeout -= 1
>                    if timeout == 0:
>                        print "Problem with fluidsynth: switching to synth."
>                        play_method = "synth"
>                        break
>                    try:
>                        fluid.connect((host, port))
>                    except BaseException:
>                        sleep(0.05)
>                        continue
>                    else:
>                        break
>
>(I'm using BaseException because I haven't been able to discover what
>exception class[es] socket uses).
>
>The problem is that this fails to connect ( the error is "111: Connection
>refused") the first time I run it after booting if fluidsynth is not already
>running, no matter how long the timeout is; after Ctrl-C'ing out of the
>program, all subsequent attempts succeed. Note that fluidsynth need not be
>running for a success to occur.

The most obvious problem is that you're trying to re-use a socket on which
a connection attempt has failed.  This isn't allowed and will always fail.
You must create a new socket for each connection attempt.

You might also want to consider using a higher level socket library than
the "socket" module.  The socket module exposes you to lots of very low
level details and platform-specific idiosyncrasies.  You may find that a
library like Twisted (<http://twistedmatrix.com/>) will let you write
programs with fewer bugs.

Jean-Paul


From tim.wintle at teamrubber.com  Mon Feb  9 10:34:02 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 09 Feb 2009 15:34:02 +0000
Subject: thread. question
In-Reply-To: <gmpgbp$60o$1@ger.gmane.org>
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
Message-ID: <1234193642.7630.63.camel@tim-laptop>

Thanks for both replies,

On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
> You shouldn't use the thread module directly. It's not meant to be used
> by a user. Please stick to the threading module. You won't notice a
> slowdown, trust me :)
I'm aware that thread is being renamed to _thread in python 3.0, but is
it being depricated or anything like that?

This is for an app that has been running for quite a long time and it's
now time for fairly heavy optimisations as load is increasing (Believe
me, I wouldn't have been looking at the C otherwise) - so I'll see if I
do notice any effect with threading.

<snip>
> Yes, Python uses native threads, not green threads. However Python pure
> code can't utilize more than one CPU per process. On order to use
> multiple CPUs you have to use multiple processes or use C code that
> doesn't use any Python API. Google for "GIL" if you are interested in
> more information.

Thanks for the info - I'm very aware of the GIL, but had never looked at
the implementation before and for some reason thought that python's
threads were in userspace.

I'm already using a multiple-process architecture overall, but using
threads to avoid waiting when handling SQL and TCP.

Tim




From exarkun at divmod.com  Mon Feb  9 10:42:16 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:42:16 -0500
Subject: thread. question
In-Reply-To: <1234193642.7630.63.camel@tim-laptop>
Message-ID: <20090209154216.12853.415160543.divmod.quotient.7862@henry.divmod.com>

On Mon, 09 Feb 2009 15:34:02 +0000, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>Thanks for both replies,
>
>On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
>> You shouldn't use the thread module directly. It's not meant to be used
>> by a user. Please stick to the threading module. You won't notice a
>> slowdown, trust me :)
>I'm aware that thread is being renamed to _thread in python 3.0, but is
>it being depricated or anything like that?
>
>This is for an app that has been running for quite a long time and it's
>now time for fairly heavy optimisations as load is increasing (Believe
>me, I wouldn't have been looking at the C otherwise) - so I'll see if I
>do notice any effect with threading.

You may want to look into dropping the use of threads (where possible,
eg for handling TCP connections) if you're trying to optimize the app.
Threads come with a lot of overhead that can be avoided by using non-
blocking operations instead.

Jean-Paul


From benjamin.kaplan at case.edu  Mon Feb  9 10:56:14 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 9 Feb 2009 10:56:14 -0500
Subject: cannot install
In-Reply-To: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
Message-ID: <ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>

On Mon, Feb 9, 2009 at 9:05 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:

> I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python 3.0
> into a folder (/Library/Frameworks/Python.framework) and ran commands:
>
> cd /Library/Frameworks/Python.framework/Python-3.0
> python setup.py install
>
> and got the message reporting a syntax error:
>
> Macintosh:~ vzupka$ /bin/csh
> [Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python setup.py
> install
>   File "setup.py", line 232
>     except (CCompilerError, DistutilsError) as why:
>                                              ^
> SyntaxError: invalid syntax
> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%
>
> What is the reason and how do I install?
>


You can't use setup.py because the python 2.5 on your system (or 2.6 if you
installed it) is incompatible with Python 3 modules. You need to compile
Python 3 yourself. It will then automatically call setup.py to create all
the extension modules.

Just unpack the tarball anywhere and use the following commands  Python 3 is
automatically installed as python3.0, so you don't need to worry about
overwriting the default python on the system.

./configure --enable-framework
make
sudo make install

more complete instructions are in the Mac/README file, except substitute
"Python 3.0" everywhere it says "MacPython 2.6". You will probably need to
install a whole bunch of packages to compile it. configure will tell you
about them. MacPorts (www.macports.org) and fink (www.finkproject.org)
provide an easy way to get them.


> Regards,
> Vladim?r ?upka
> vzupka at volny.cz
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From anthra.norell at bluewin.ch  Mon Feb  9 11:29:25 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 09 Feb 2009 17:29:25 +0100
Subject: Simple question - stock market simulation
In-Reply-To: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
Message-ID: <499059E5.7000301@bluewin.ch>

cptn.spoon wrote:
> I'm trying to create an incredibly simple stock market simulator to be
> used in a childrens classroom and I'm wondering whether someone can
> point me in the right direction.
>
> I basically want to be able to have a stock struct as follows:
>
> StockName = "Test"
> StockPriceList = (12,13,12,10,10,8,10)
> StockRisk = 0.15
> StockQty = 2000
>
> And then have a StockMarket struct that can contain 1 to many Stocks.
> I then want to be able to iterate through the stocks to perform
> operations as such:
>
> for Stock in StockMarket:
>
> I'm not asking for tips on the program itself, I just can't figure out
> how to get the data structures in place. Would I use Classes or would
> I use dictionaries? Am I completely off the mark with this?
>
> Apologies for such a rudimentary question...I'm very new to all this.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
If the subject is investment performance, surely your best bet is to 
hand out piggy banks.

Frederic







From bdesth.quelquechose at free.quelquepart.fr  Mon Feb  9 11:37:09 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 09 Feb 2009 17:37:09 +0100
Subject: wxPython vs Glade?
In-Reply-To: <mailman.9138.1234185807.3487.python-list@python.org>
References: <mailman.9138.1234185807.3487.python-list@python.org>
Message-ID: <49906950$0$24811$426a34cc@news.free.fr>

Michael Pobega a ?crit :
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython.


wxPython *is* a GUI toolkit (or, more exactly, a python binding for 
wxWidgets).

> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os),  while Glade
> seems extremely simple to make a UI

Glade is a (graphical) GUI *builder* for the GTK+ toolkit - it' not a 
toolkit itself. So you're comparing apples to gorillas.

FWIW, there is (was ???) a Glade-like graphical builder for wxWidgets 
named wxGlade.




From Krzysztof.Retel at googlemail.com  Mon Feb  9 11:39:08 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Mon, 9 Feb 2009 08:39:08 -0800 (PST)
Subject: Network packets processor advice
Message-ID: <76830d52-9b0f-4e78-adc3-999bb125d472@p13g2000yqc.googlegroups.com>

Hi,

I am wrting a network packet processor. The processor listens on a
specific port for incomming UDP or TCP packets. When the packet
arrives it has to parse it, store in DB and if this succeed it has to
acknowledge the packet to the client. Now the problem is that I want
to have a control over possible failures of the system. For instance,
if the DB is gone, the processor should stop working and restart when
DB is back to live.

So the questions are:
1. Which approach is the best for building such software? For instance
using threads?
2. I can use the 'monit' tool for monitorig processes. However, not
sure yet how to start a python script with a specific process id. Is
it possible at all?
3. Any other suggestions?

Cheers,
K


From remm1 at member.fsf.org  Mon Feb  9 11:45:59 2009
From: remm1 at member.fsf.org (Rob)
Date: Mon, 09 Feb 2009 10:45:59 -0600
Subject: Local python web server problem
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.09.16.45.58.976303@member.fsf.org>

> I run the cherrypy hello world! example and when I visit
> 127.0.0.1:8080
> on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
> local network is 192.168.100.18
> but when I visit 192.168.100.18, there is another page: "It Works!".
> What is "It Works!"? and when I type 192.168.100.18:8080 in another
> local pc, the page didn't load?

You need to have the server listen on 192.168.100.18 not 127.0.0.1. 
They are different.  127.0.0.1 is visible only locally. The
192.168.100.18 is visible both locally and from other hosts.

I don't use cherrypy so don't know how you set this up.  Are you using
apache to host cherrypy or does it have it's own web server? If your using
apache the IP address is selected with the Listen directive normally in
the /etc/apache2/ports.conf file.

> Thanks and sorry for my bad English.
Your english is good.

Rob



From hall.jeff at gmail.com  Mon Feb  9 11:52:03 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Mon, 9 Feb 2009 08:52:03 -0800 (PST)
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
	<498F285B.6060905@v.loewis.de>
Message-ID: <d202ced3-da02-4fda-8815-821067e45be8@l16g2000yqo.googlegroups.com>

I had it downloaded and sitting in the root c:\ but didn't get it to
run because I didn't think about the \scripts folder not being in the
Path. Problem solved and fixed. Thank you all for your help.

On a side note, "easy_install MySQL-python" produced the following
messages:
Searching for MySQL-python
Reading http://pypi.python.org/simple/MySQL_python/
Reading http://sourceforge.net/projects/mysql-python
Reading http://sourceforge.net/projects/mysql-python/
Best match: MySQL-python 1.2.3b1
Downloading http://osdn.dl.sourceforge.net/sourceforge/mysql-python/MySQL-python-1.2.3b1.tar.gz
Processing MySQL-python-1.2.3b1.tar.gz
Running MySQL-python-1.2.3b1\setup.py -q bdist_egg --dist-dir c:
\docume~1\jhall\locals~1\temp\easy_install-t_ph9k\MySQL-
python-1.2.3b1\egg-dist-tmp-3gtuz9
error: The system cannot find the file specified

installing from the hard drive worked fine, however.


From xahlee at gmail.com  Mon Feb  9 11:55:35 2009
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 9 Feb 2009 08:55:35 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <b0f033d9-62c3-487b-a869-cef5664b0ba5@r15g2000prh.googlegroups.com>

Xah Lee wrote:
> ...
> if you want software engineering books, i suggest try some books that
> are based on statistical survey, as opposed to some dignitary's
> ?opinion? or current fashion & trends that comes with a jargon. These
> type of books are a dime a dozen, every year, they come and go. The
> stastical survey approach takes major understaking and cost. The
> opinion type any motherfucking ?guru? can write. e.g. Paul Graham has
> you buy into certain concept of ?hackers? fucker and claim they are
> like ?painters?. Certain Gabriel wants you to believe in poetry and C
> is the last language. (see Book Review: Patterns of
> Software
> http://xahlee.org/PageTwo_dir/Personal_dir/bookReviewRichardGabriel.html
> ) et al. Certain Gosling wants you to believe Java is the last lang on
> earth that'll wipe out Microsoft (circa 1998).
>
> ...
>
> ... what society overwhelmingly asks for is snake oil. Of course, the
> snake oil has the most impressive names ?otherwise you would be
> selling nothing? like ?Structured Analysis and Design?, ?Software
> Engineering?, ?Maturity Models?, ?Management Information Systems?,
> ?Integrated Project Support Environments? ?Object Orientation? and
> ?Business Process Re-engineering? (the latter three being known as
> IPSE, OO and BPR, respectively).? ? Edsger W Dijkstra (1930-2002), in
> EWD 1175: The strengths of the academic enterprise.
>
> you want to be a good programer? Study math, the math of programing,
> and master the langs and protocols and tools you use. You want to
> climb the tech industry ladder? get better at people, learn politics.
> You want to be rich? Study business. Chances are, you are a coding
> geek, and at heart you dna is not geared to be interested in politics
> or business, and you'll never be rich or big ceo just because of that.
>
> See also:
> ? Why Software Suck
>  http://xahlee.org/UnixResource_dir/writ/why_software_suck.html
>
> looking at the eXtreme Programing fuckheads's traffic history:
> http://groups.google.com/group/comp.software.extreme-programming/about
>
> for those who are not aware, it was one of the snake oil wildly
> popular in around 2001.

Today, i happened to run across a blog on the eXtreme Programing FUCK.

http://www.yosefk.com/blog/extreme-programming-explained.html

Great article!

  Xah
? http://xahlee.org/

?


From aahz at pythoncraft.com  Mon Feb  9 12:02:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 Feb 2009 09:02:58 -0800
Subject: Calling into Python from a C thread
References: <mailman.8619.1233597806.3487.python-list@python.org>
Message-ID: <gmpnk2$nhr$1@panix3.panix.com>

[posted & e-mailed]

In article <mailman.8619.1233597806.3487.python-list at python.org>,
Philip Semanchuk  <philip at semanchuk.com> wrote:
>
>I'm trying call Python from inside of a C thread that's running in a  
>Python extension I've written and I am not having much luck. My C  
>thread function consists of simply this, and I get a segmentation  
>fault from Python:

Because it's been a week without response, I suggest you try the capi
mailing list.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From tn.pablo at gmail.com  Mon Feb  9 12:07:07 2009
From: tn.pablo at gmail.com (ptn)
Date: Mon, 9 Feb 2009 09:07:07 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<873aesbzng.fsf@agentultra.com>
	<mailman.8917.1233860847.3487.python-list@python.org>
Message-ID: <e7880494-8a3b-44ed-9ab2-5d34d0cd73d0@33g2000yqm.googlegroups.com>

On Feb 5, 2:07?pm, rdmur... at bitdance.com wrote:
> Quoth J Kenneth King <ja... at agentultra.com>:
>
>
>
> > mk <mrk... at gmail.com> writes:
>
> > > Hello everybody,
>
> > > Any better solution than this?
>
> > > def flatten(x):
> > > ? ? res = []
> > > ? ? for el in x:
> > > ? ? ? ? if isinstance(el,list):
> > > ? ? ? ? ? ? res.extend(flatten(el))
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? res.append(el)
> > > ? ? return res
>
> > > a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> > > print flatten(a)
>
> > > [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> > > Regards,
> > > mk
>
> >http://mail.python.org/pipermail/python-list/2005-July/330367.html
>
> That's worth reading. ?I'm not sure why I'm finding this fun, but who
> cares. ?I tried a couple of other functions after reading that article,
> and it looks like a generator that scans the nested lists is actually
> the winner, and also is in many ways the most elegant implementation.
> Of course, as noted in the emails following above article, the test data
> is really inadequate for proper optimization testing ;)
>
> -----------------------------------------------------------------
> from __future__ import print_function
> from timeit import Timer
> from itertools import chain
>
> # This is the one from the article quoted above.
> def flatten6(seq):
> ? ? i = 0
> ? ? while (i != len(seq)):
> ? ? ? ? while hasattr(seq[i], '__iter__'):
> ? ? ? ? ? ? seq[i:i+1] = seq[i]
> ? ? ? ? i = i + 1
> ? ? return seq
>
> #This is my favorite from a readability standpoint out of
> #all the things I tried. ?It also performs the best.
> def flatten8(seq):
> ? ? for x in seq:
> ? ? ? ? if not hasattr(x, '__iter__'): yield x
> ? ? ? ? else:
> ? ? ? ? ? ? for y in flatten8(x):
> ? ? ? ? ? ? ? ? yield y
>
> l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
>
> if __name__=="__main__":
> ? ? print(l)
> ? ? print('flatten6', flatten6(l))
> ? ? print('flatten8', list(flatten8(l)))
> ? ? print('flatten6', Timer("flatten6(l)", "from temp3 import flatten6, l").timeit())
> ? ? print('flatten8', Timer("list(flatten8(l))", "from temp3 import flatten8, l").timeit())
>
> -----------------------------------------------------------------
>
> >src/python/Python-3.0/python temp3.py
>
> [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
> flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten6 32.8386368752
> flatten8 30.7509689331
>
> >python temp3.py
>
> [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
> flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten6 34.730714798
> flatten8 32.3252940178
>
> --RDM

I think the generator is clearer with a try statement, like in Magnus
Lie Hetland's solution from Beginning Python:

def flatten(nested):
    try:
        # Don't iterate over string-like objs.
        try: nested + ''
        except TypeError: pass
        else: raise TypeError
        for sub in nested:
            for elem in flatten(sub):
                yield elem
    except TypeError:
        # The for doesn't work for single elements.
        yield nested

You can't iterate over string-like objs because the all strings are
built of infinite empty lists at the beginning, leading to infinite
recursion.


From aleksandr.goretoy at gmail.com  Mon Feb  9 12:07:50 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Mon, 9 Feb 2009 11:07:50 -0600
Subject: GAE read binary file into db.BlobProperty()
Message-ID: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>

How to read Binary file into GAE(Google App Engine) db.BlobProperty()
datastore?

-Alex Goretoy
http://www.goretoy.com
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From aahz at pythoncraft.com  Mon Feb  9 12:10:04 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 Feb 2009 09:10:04 -0800
Subject: Threading / Queue management
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <gmpo1c$pft$1@panix3.panix.com>

In article <a852a388-2e3f-4b45-aa80-695fc116ecfc at v18g2000pro.googlegroups.com>,
Power Button  <mjbuchan at gmail.com> wrote:
>
>I wonder if anyone can help with the following. I have written a
>script which polls a server and if it finds and pending orders, it
>instantiates an new object (foo) - in a new thread and processes some
>data. In the new object (foo), there are also some long running
>processes so I am trying to create a thread pool/queue and to push
>items onto the queue in the instantiated object (foo). Currently I am
>creating the Queue in foo but this means I am starting up 5 new
>threads every time I instantiate foo. What I want to be able to do is
>create the Queue and start 5 (n) threads when my program starts and
>then push items onto the queue in foo.

Not sure what you're trying to do, but you meay find this sample code
useful:

http://www.pythoncraft.com/OSCON2001/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From remm1 at member.fsf.org  Mon Feb  9 12:10:18 2009
From: remm1 at member.fsf.org (Rob)
Date: Mon, 09 Feb 2009 11:10:18 -0600
Subject: global name 'sqrt' is not defined
References: <mailman.8845.1233824962.3487.python-list@python.org>
Message-ID: <pan.2009.02.09.17.10.17.947284@member.fsf.org>

> Any ideas?  If I do something like "import math" in the subfunction, 
> then the error changes to "global name 'math' is not defined".

Presumably ipython does an import so you need to import it yourself
something like:

from math import sqrt

at the top of your source file.  I don't know why math would not be
defined, it's built in -- probably a scoping logic problem in your code. 
Put the form/import statement at the top of your module file (as is
usually done), not inside a function or other block.

Rob



From bdesth.quelquechose at free.quelquepart.fr  Mon Feb  9 12:12:14 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 09 Feb 2009 18:12:14 +0100
Subject: Help needed to retrieve text from a text-file using RegEx
In-Reply-To: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <49907188$0$7875$426a34cc@news.free.fr>

Oltmans a ?crit :
> Here is the scenario:
> 
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
> 
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
> 
> -------------
> 
> So now if I run the program and user enters
> 
> DecConnector
> 
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
> 
>  with open('MyTextFile.txt') 

This will lookup for MyFile.txt in the system's current working 
directory - which is not necessarily in the script's directory.

>  as file:

this shadows the builtin's 'file' symbol.

>                 for line in file:
> 
>                     if mName in line: #mName is the string that
> contains user input

> 
>                         Path =str(line).strip('\n')

'line' is already a string.

>                         tempStr=Path
> 
>                         Path=tempStr.replace(mName+'=',"",1)

You don't need the temporary variable here. Also, you may want to use 
str.split instead:


# NB : renaming for conformity to
# Python's official naming conventions

# 'name' => what the user looks for
# 'path_to_file' => fully qualified path to the 'database' file

target = "%s=" % name # what we are really looking for

with open(path_to_file) as the_file:
     for line in the_file:
         # special bonus : handles empty lines and 'comment' lines
         # feel free to comment out the thre following lines if
         # you're sure you don't need them !-)
         line = line.strip()
	if not line or line.startswith('#') or line.startswith(';'):
             continue

         # faster and simpler than a regexp
         if line.startswith(target):
             # since the '=' is in target, we can safely assume
             # that line.split('=') will return at least a
             # 2-elements list
             path = line.split('=')[1]
             # no need to look further
             break
     else:
         # target not found...
         path = None



> I was wondering if using RegEx will make this look better.

I don't think so. Really.


From rolf.oltmans at gmail.com  Mon Feb  9 12:22:32 2009
From: rolf.oltmans at gmail.com (Oltmans)
Date: Mon, 9 Feb 2009 09:22:32 -0800 (PST)
Subject: Help needed to retrieve text from a text-file using RegEx
Message-ID: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>

Here is the scenario:

It's a command line program. I ask user for a input string. Based on
that input string I retrieve text from a text file. My text file looks
like following

Text-file:
-------------
AbcManager=C:\source\code\Modules\Code-AbcManager\
AbcTest=C:\source\code\Modules\Code-AbcTest\
DecConnector=C:\source\code\Modules\Code-DecConnector\
GHIManager=C:\source\code\Modules\Code-GHIManager\
JKLConnector=C:\source\code\Modules\Code-JKLConnector

-------------

So now if I run the program and user enters

DecConnector

Then I'm supposed to show them this text "C:\source\code\Modules\Code-
DecConnector" from the text-file. Right now I'm retrieving using the
following code which seems quite ineffecient and inelegant at the same
time

 with open('MyTextFile.txt') as file:

                for line in file:

                    if mName in line: #mName is the string that
contains user input

                        Path =str(line).strip('\n')

                        tempStr=Path

                        Path=tempStr.replace(mName+'=',"",1)

I was wondering if using RegEx will make this look better. If so, can
you please suggest a Regular Expression for this? Any help is highly
appreciated. Thank you.


From gabriel.rossetti at arimaz.com  Mon Feb  9 12:24:12 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 09 Feb 2009 18:24:12 +0100
Subject: poplib
Message-ID: <499066BC.6020900@arimaz.com>

Hello,

I am using poplib and I noticed that calls to top() don't return the msg 
info (2nd index in the returned list, e.g. email.top(1,0)[1]) in the 
same order, by that I mean the date could be email.top(1,0)[1][2] or 
email.top(1,0)[1][5], etc. Is there a reason for that other than that 
may be how the server is sending them? Why not re-order them and send 
back a list that always had the date as element n or even better a dict?

Thank you,
Gabriel


From philip at semanchuk.com  Mon Feb  9 12:28:50 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 9 Feb 2009 12:28:50 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <20090209170259.1D4C78FDE0@panix3.panix.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>
	<20090209170259.1D4C78FDE0@panix3.panix.com>
Message-ID: <BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>


On Feb 9, 2009, at 12:02 PM, Aahz wrote:

> [posted & e-mailed]
>
> In article <mailman.8619.1233597806.3487.python-list at python.org>,
> Philip Semanchuk  <philip at semanchuk.com> wrote:
>>
>> I'm trying call Python from inside of a C thread that's running in a
>> Python extension I've written and I am not having much luck. My C
>> thread function consists of simply this, and I get a segmentation
>> fault from Python:
>
> Because it's been a week without response, I suggest you try the capi
> mailing list.

I didn't know there *was* such a thing. Thanks for the tip! For those  
who might be interested, the list is here:
http://mail.python.org/mailman/listinfo/capi-sig


FYI, I got my code working and it is in the latest release of posix_ipc:
http://semanchuk.com/philip/posix_ipc/

The function MessageQueue_request_notification() does some necessary  
setup and the function process_notification() does the rest of the work.


Cheers
Philip




From jonathan.wright at gmail.com  Mon Feb  9 12:36:48 2009
From: jonathan.wright at gmail.com (Jon)
Date: Mon, 9 Feb 2009 09:36:48 -0800 (PST)
Subject: How to use buildout with a scripts directory?
Message-ID: <8e1e9045-593d-4e99-8f8f-05353ef96879@o36g2000yqh.googlegroups.com>

Hello,

I am trying to use buildout and am having trouble to figure out how to
get it to install the scripts that come with a package. They are
present inside the egg which is installed by buildout, but they don't
end up in the bin directory. After running buildout my bin directory
is empty, but I can find:

.\eggs\imaged11-1.2.3-py2.5-win32.egg\EGG-INFO\scripts\peaksearch.py

In the package I have a directory (ImageD11) with the library stuff in
it and a directory named "scripts" with the scripts. When I use
distutils or setuptools it does what I expected:

setup.py:
...
setup(name='ImageD11',
      ...,
      packages = ["ImageD11"],
      package_dir = {"ImageD11":"ImageD11"},
     scripts = [ "scripts/peaksearch.py",
                    "scripts/bgmaker.py",
                    ...]
     )



c:\testImageD11distutils\> python setup.py install
...
Installing peaksearch.py script to c:\python25\Scripts
Installing bgmaker.py script to c:\python25\Scripts

Now I am wondering how to persuade "buildout" to do the same thing,
but place those scripts into it's own little area.

In buildout.cfg I have:
==================
[buildout]
parts = ImageD11

[ImageD11]
recipe = zc.recipe.egg:scripts
scripts = scripts/peaksearch.py
eggs = ImageD11
version = 1.2.3


It seems to acknowledge that scripts/peaksearch.py is requested, but
doesn't seem to do anything about it. My scripts mostly just map
command line arguments to function calls, something like this:

if __name__=="__main__":
    import ImageD11.something, sys
    ImageD11.something.do_something_interesting( sys.argv[1], sys.argv
[2] )

I've read the documentation at http://pypi.python.org/pypi/zc.buildout
several times but I still can't figure out how to make these scripts
part of the build. There seems to be a lot of talk about entry_points,
but I'm blocked on those as to what is the entry point for an if
__name__=="__main__": idiom?

Thanks in advance for any help!

Jon





From clp2 at rebertia.com  Mon Feb  9 12:40:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 09:40:57 -0800
Subject: Help needed to retrieve text from a text-file using RegEx
In-Reply-To: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902090940o462ee90er978adddbdeb5983d@mail.gmail.com>

On Mon, Feb 9, 2009 at 9:22 AM, Oltmans <rolf.oltmans at gmail.com> wrote:
> Here is the scenario:
>
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
>
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
>
> -------------
>
> So now if I run the program and user enters
>
> DecConnector
>
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
>
>  with open('MyTextFile.txt') as file:
>
>                for line in file:
>
>                    if mName in line: #mName is the string that
> contains user input
>
>                        Path =str(line).strip('\n')
>
>                        tempStr=Path
>
>                        Path=tempStr.replace(mName+'=',"",1)
>
> I was wondering if using RegEx will make this look better. If so, can
> you please suggest a Regular Expression for this? Any help is highly
> appreciated. Thank you.

If I might repeat Jamie Zawinski's immortal quote:
    Some people, when confronted with a problem, think "I know, I'll
use regular expressions." Now they have two problems.

If you add one section header (e.g. "[main]") to the top of the file,
you'll have a valid INI-format file which can be parsed by the
ConfigParser module --
http://docs.python.org/library/configparser.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From castironpi at gmail.com  Mon Feb  9 12:46:26 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Mon, 9 Feb 2009 09:46:26 -0800 (PST)
Subject: generator object or 'send' method?
Message-ID: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>

Hello,

I am writing a generator to return a sequence of numbers with some
variation.  The parameters of the variation can be changed by the
caller, even after the generator is started.  My question is, is it
better to wrap the generator in an object, so that the parameters can
be changed just by an attribute access?  Or keep the generator clear,
and modify parameters with a 'send' call?

P.S.  It would receive the 'send' from a different point in control
flow than its usual 'next'.  Should it repeat a value if it receives a
'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
generator?

Thanks sincerely as always.


From todpose at hotmail.com  Mon Feb  9 13:09:26 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Mon, 9 Feb 2009 10:09:26 -0800
Subject: Putting asterisks around text
Message-ID: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>


I'm trying to write a program that puts asterisks around the input text using while loop.
I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From darcy at druid.net  Mon Feb  9 13:20:46 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 9 Feb 2009 13:20:46 -0500
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
Message-ID: <20090209132046.091f5b8a.darcy@druid.net>

On Mon, 9 Feb 2009 10:09:26 -0800
"todpose at hotmail.com" <todpose at hotmail.com> wrote:
> I'm trying to write a program that puts asterisks around the input text using while loop.
> I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********

while understand_problem is False:
    study("textbook")

complete("homework")

if want_help is True:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From google at mrabarnett.plus.com  Mon Feb  9 13:40:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 09 Feb 2009 18:40:05 +0000
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <49907885.2000902@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Mon, 9 Feb 2009 10:09:26 -0800
> "todpose at hotmail.com" <todpose at hotmail.com> wrote:
>> I'm trying to write a program that puts asterisks around the input text using while loop.
>> I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
> 
> while understand_problem is False:
>     study("textbook")
> 
> complete("homework")
> 
> if want_help is True:
>     study("http://www.catb.org/~esr/faqs/smart-questions.html")
> 
That's not Pythonic, and you shouldn't use "is" except when checking for
identity. The recommended style is:

     while not understand_problem:
         study("textbook")

     complete("homework")

     if want_help:
         study("http://www.catb.org/~esr/faqs/smart-questions.html")

See how much clearer that is? ;-)


From rdmurray at bitdance.com  Mon Feb  9 13:51:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 9 Feb 2009 18:51:07 +0000 (UTC)
Subject: Help needed to retrieve text from a text-file using RegEx
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <gmptuq$tu0$1@ger.gmane.org>

Oltmans <rolf.oltmans at gmail.com> wrote:
> Here is the scenario:
> 
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
> 
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
> 
> -------------
> 
> So now if I run the program and user enters
> 
> DecConnector
> 
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
> 
>  with open('MyTextFile.txt') as file:
>      for line in file:
>          if mName in line: #mName is the string that contains user input
>              Path =str(line).strip('\n')
>              tempStr=Path
>              Path=tempStr.replace(mName+'=',"",1)

I've normalized your indentation and spacing, for clarity.

> I was wondering if using RegEx will make this look better. If so, can
> you please suggest a Regular Expression for this? Any help is highly
> appreciated. Thank you.

This smells like it might be homework, but I'm hoping you'll learn some
useful python from what follows regardless of whether it is or not.

Since your complaint is that the above code is inelegant and inefficient,
let's clean it up.  The first three lines that open the file and set up
your loop are good, and I think you will agree that they are pretty clean.
So, I'm just going to help you clean up the loop body.

'line' is already a string, since it was read from a file.  No need to
wrap it in 'str':

              Path = line.strip('\n')
              tempStr=Path
              Path=tempStr.replace(mName+'=',"",1)

'strip' removes characters from _both_ ends of the string.  If you are
trying to make sure that you _only_ strip a trailing newline, then you
should be using rstrip.  If, on the other hand, you just want to get
rid of any leading or trailing whitespace, you could just call 'strip()'.
Since your goal is to print the text from after the '=', I'll assume
that stripping whitespace is desirable:

              Path = line.strip()
              tempStr=Path
              Path=tempStr.replace(mName+'=',"",1)

The statement 'tempStr=Path' doesn't do what you think it does.
It just creates an alternate name for the string pointed to by Path.
Further, there is no need to have an intermediate variable to hold a
value during transformation.  The right hand side is computed, using
the current values of any variables mentioned, and _then_ the left hand
side is rebound to point to the result of the computation.  So we can
just drop that line entirely, and use 'Path' in the 'replace' statement:

              Path = line.strip()
              Path = Path.replace(mName+'=',"",1)

However, you can also chain method calls, so really there's no need for
two statements here, since both calls are simple:

              Path = line.strip().replace(mName+'=',"",1)

To make things even simpler, Python has a 'split' function.  Given the
syntax of your input file I think we can assume that '=' never appears
in a variable name.  split returns a list of strings constructed by
breaking the input string at the split character, and it has an optional
argument that gives the maximum number of splits to make.  So by doing
'split('=', 1), we will get back a list consisting of the variable name
and the remainder of the line.  The remainder of the line is exactly
what you are looking for, and that will be the second element of the
returned list.  So now your loop body is:

              Path = line.strip().split('=', 1)[1]

and your whole loop looks like this:

    with open('MyTextFile.txt') as file:
        for line in file:
            if mName in line:
                Path = line.strip().split('=', 1)[1]

I think that looks pretty elegant.  Oh, and you might want to add a
'break' statement to the loop, and also an 'else:' clause (to the for
loop) so you can issue a 'not found' message to the user if they type
in a name that does not appear in the input file.

--RDM



From ptmcg at austin.rr.com  Mon Feb  9 13:59:22 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 9 Feb 2009 10:59:22 -0800 (PST)
Subject: Help needed to retrieve text from a text-file using RegEx
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <6a0e4184-26c1-4ea1-bd81-452c7332abbf@i38g2000yqd.googlegroups.com>

On Feb 9, 11:22?am, Oltmans <rolf.oltm... at gmail.com> wrote:
> Here is the scenario:
>
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
>
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
>

Assuming the text-file is in the under-30Mb size, I would just read
the whole thing into a dict at startup, and then use the dict over and
over.

data = file(filename).read()
lookup = dict( line.split('=',1) for line in data.splitlines() if
line )

# now no further need to access text file, just use lookup variable

while True:
    user_entry = raw_input("Lookup key: ").strip()
    if not user_entry:
        break
    if user_entry in lookup:
        print lookup[user_entry]
    else:
        print "No entry for '%s'" % user_entry


From rodmena.com at gmail.com  Mon Feb  9 14:01:08 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Mon, 9 Feb 2009 11:01:08 -0800 (PST)
Subject: Local python web server problem
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.09.16.45.58.976303@member.fsf.org>
Message-ID: <c139d0cc-0d62-44d3-9bc0-799719831409@i38g2000yqd.googlegroups.com>

Thanks guys, Really appreciate your help. I am trying to solve the
problem and will keep you posted when I found a solution.

Farsheed Ashouri,
Tehran, Iran


From todpose at hotmail.com  Mon Feb  9 14:09:49 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Mon, 9 Feb 2009 11:09:49 -0800
Subject: Putting asterisks around text
Message-ID: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>




From: todpose at hotmail.comTo: python-list at python.orgSubject: Putting asterisks around textDate: Mon, 9 Feb 2009 10:09:26 -0800

I'm trying to write a program that puts asterisks around the input text using while loop.I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
 
I'm not necessarily asking for an answer. A hint would be grateful as well.
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From digitig at gmail.com  Mon Feb  9 14:18:19 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 9 Feb 2009 19:18:19 +0000
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>
References: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>
Message-ID: <aee48b3c0902091118s4cd72fnf2437d3a0c2689d3@mail.gmail.com>

2009/2/9 todpose at hotmail.com <todpose at hotmail.com>:

> I'm not necessarily asking for an answer. A hint would be grateful as well.

Great. Well, first you need to read:
http://www.catb.org/~esr/faqs/smart-questions.html

Especially the section on "Before you ask".

Then you should be able to give us a question that shows that you've
tried and aren't just wanting us to do your work for you, and that
gives us a clear idea of where your sticking point is so we can
address the sticking point instead of the whole assignment.

Like: How fo you do it without using a while loop? (Yes, *I* know how
to do it without using a while loop, but to help you we need to know
what *you* know). Like: do you understand what a while loop does? And
so on.

We're a pretty friendly bunch in here, but most of us believe in
"tough love" (http://en.wikipedia.org/wiki/Tough_love).

-- 
Tim Rowe


From python.list at tim.thechases.com  Mon Feb  9 14:22:25 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 09 Feb 2009 13:22:25 -0600
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <49908271.9020703@tim.thechases.com>

D'Arcy J.M. Cain wrote:
> On Mon, 9 Feb 2009 10:09:26 -0800
> "todpose at hotmail.com" <todpose at hotmail.com> wrote:
>> I'm trying to write a program that puts asterisks around the
>> input text using while loop.
>> I can do this without using while loop, but how can you do
>> that using while loop?
>> Example:Enter a string: Hello world***********Hello world***********
> 
> while understand_problem is False:
>     study("textbook")
> complete("homework")

This implies global state is changed, and that it holds a literal 
False rather than a False-ish value.  It also doesn't make _good_ 
use of c.l.p so I'd recommend

   smart_qs = "http://www.catb.org/~esr/faqs/smart-questions.html"
   todpose = Newb()
   todpose.study(textbook)
   code = todpose.make_coding_attempt()
   works = test(code)
   while not (todpose.understand_problem() and works):
     if works:
       todpose.study([code, textbook])
     else:
       try:
         while not passes(todpose.question, smart_qs):
           todpose.study([
             smart_qs,
             textbook,
             "www.google.com",
             "docs.python.org",
             ])
         # Note:  consult_clp() expects a valid
         # code object and a smart-question
         consult_clp(code, todpose.question)
       except EpiphanyException:
         code = todpose.make_coding_attempt()
         works = test(code)
         continue
   todpose.hand_in(teacher, code)

-tkc








From tjreedy at udel.edu  Mon Feb  9 14:22:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 14:22:52 -0500
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <gmpvqa$5o3$1@ger.gmane.org>

Aaron Brady wrote:
> Hello,
> 
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started.  My question is, is it
> better to wrap the generator in an object, so that the parameters can
> be changed just by an attribute access?

Rather than wrap a generator, I would just write an iterator class.
A generator function is basically an abbreviated class statement.  (The 
abbreviation is the removal of boilerplate code.)

 > Or keep the generator clear, and modify parameters with a 'send' call?

If I were modifying a single parameter and wanted the next value 
returned immediately upon sending, I would do this.

> P.S.  It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
> generator?

But for this I would go with the class.  Pretty foolproof.

tjr



From stef.mientki at gmail.com  Mon Feb  9 14:29:30 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:29:30 +0100
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <4990841A.8070507@gmail.com>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>
>   
there's XRC and something even easier:
http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
cheers,
Stef



From stef.mientki at gmail.com  Mon Feb  9 14:31:25 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:31:25 +0100
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <4990848D.7030505@gmail.com>

Gary Herron wrote:
> rantingrick wrote:
>> I want to build a 3D CAD visualization program with Python. Now before
>> you say this is not possible with Python here me out :)
>>
>> I know OpenGL is probably my best bet BUT i want something a little
>> higher level than that. I am not ready for OpenGL yet.  I would like a
>> kit that is just above OpenGL and abstracts away all the finer
>> details, but not too much higher. VPython is a great kit but it is way
>> too high level for what i want. Here is a list of kits i am currently
>> looking at so if anybody can offer suggestions i would very much like
>> the information. Most of these are dedicated game engines but this is
>> all i can find
>>
>> Panda 3D
>> OGRE
>> Soya 3D
>> VTK
>> Cystal Space
>> CG Kit
>> SciPy
>>   
>
Maya ?
Blender ?

cheers,
Stef



From stef.mientki at gmail.com  Mon Feb  9 14:33:57 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:33:57 +0100
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <49908525.7070203@gmail.com>

Gary Herron wrote:
> rantingrick wrote:
>> I want to build a 3D CAD visualization program with Python. Now before
>> you say this is not possible with Python here me out :)
>>
>> I know OpenGL is probably my best bet BUT i want something a little
>> higher level than that. I am not ready for OpenGL yet.  I would like a
>> kit that is just above OpenGL and abstracts away all the finer
>> details, but not too much higher. VPython is a great kit but it is way
>> too high level for what i want. Here is a list of kits i am currently
>> looking at so if anybody can offer suggestions i would very much like
>> the information. Most of these are dedicated game engines but this is
>> all i can find
>>
>> Panda 3D
>> OGRE
>> Soya 3D
>> VTK
>> Cystal Space
>> CG Kit
>> SciPy
>>   
>
I forgot:
pySoy
Intensity

cheers,
Stef



From lists at cheimes.de  Mon Feb  9 14:35:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 20:35:14 +0100
Subject: Calling into Python from a C thread
In-Reply-To: <BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>
	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
Message-ID: <gmq0hi$8gv$1@ger.gmane.org>

Philip Semanchuk wrote:
> I didn't know there *was* such a thing. Thanks for the tip! For those
> who might be interested, the list is here:
> http://mail.python.org/mailman/listinfo/capi-sig
> 
> 
> FYI, I got my code working and it is in the latest release of posix_ipc:
> http://semanchuk.com/philip/posix_ipc/
> 
> The function MessageQueue_request_notification() does some necessary
> setup and the function process_notification() does the rest of the work.

Let me guess. You either forgot to start Python's threading system or
you didn't register you thread with Python. You need to deal with
PyThread_init_thread(), PyEval_InitThreads(), PyThreadState_New(),
PyThreadState_Clear() and PyThreadState_DeleteCurrent(). The module
Modules/threadmodule.c contains some examples.

Christian



From kyosohma at gmail.com  Mon Feb  9 14:38:50 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 9 Feb 2009 11:38:50 -0800 (PST)
Subject: wxPython vs Glade?
References: <mailman.9138.1234185807.3487.python-list@python.org>
Message-ID: <1f2f07c0-fc91-42b1-8d3b-b9fa7e0c37e6@f3g2000yqf.googlegroups.com>

On Feb 9, 7:23?am, Michael Pobega <pob... at gmail.com> wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>
> --
> ? ? ? ? ? ? ? ? ?http://pobega.wordpress.com
> ? ? ? ? ? ? ? ? ? ?http://identica/pobega
>
> ?signature.asc
> < 1KViewDownload

I usually just hand-code my apps in IDLE or Wing IDE. I recommend
joining the official wxPython mailing list regardless of what you pick
though as you'll likely pick up a LOT of helpful tips and tricks
there.

Mike


From mdemenko at gmail.com  Mon Feb  9 14:43:42 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Mon, 09 Feb 2009 20:43:42 +0100
Subject: py2exe and distutils
In-Reply-To: <mailman.9105.1234125632.3487.python-list@python.org>
References: <gmk5o8$g34$00$1@news.t-online.com>	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
	<mailman.9105.1234125632.3487.python-list@python.org>
Message-ID: <4990876E.5080800@gmail.com>

Gabriel Genellina schrieb:
> En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net> 
> escribi?:
> 
>>> Maxim Demenko schrieb:
>>>> Hi,
>>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 
>>>> 0.6.9
>>>> Now i can't list installed modules, here is the stacktrace:
>> [...]
>>>> Any suggestion, how to fix this issue?
>>>
>> Thomas Heller schrieb:
>>> Looks like a setuptools problem to me.  Here's the output on my system:
>>
>> Actually, I don't know where the problem is.  Maybe pydoc?
> 
> Yes, pydoc isn't robust enough in 2.5; see 
> <http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788> 
> for a quick fix.
> 

Thank you Gabriel, that works nicely.

Best regards

Maxim


From mdemenko at gmail.com  Mon Feb  9 14:43:42 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Mon, 09 Feb 2009 20:43:42 +0100
Subject: py2exe and distutils
In-Reply-To: <mailman.9105.1234125632.3487.python-list@python.org>
References: <gmk5o8$g34$00$1@news.t-online.com>	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
	<mailman.9105.1234125632.3487.python-list@python.org>
Message-ID: <4990876E.5080800@gmail.com>

Gabriel Genellina schrieb:
> En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net> 
> escribi?:
> 
>>> Maxim Demenko schrieb:
>>>> Hi,
>>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 
>>>> 0.6.9
>>>> Now i can't list installed modules, here is the stacktrace:
>> [...]
>>>> Any suggestion, how to fix this issue?
>>>
>> Thomas Heller schrieb:
>>> Looks like a setuptools problem to me.  Here's the output on my system:
>>
>> Actually, I don't know where the problem is.  Maybe pydoc?
> 
> Yes, pydoc isn't robust enough in 2.5; see 
> <http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788> 
> for a quick fix.
> 

Thank you Gabriel, that works nicely.

Best regards

Maxim


From deets at nospam.web.de  Mon Feb  9 14:59:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 09 Feb 2009 20:59:16 +0100
Subject: version in setup.cfg
In-Reply-To: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
References: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
Message-ID: <6vbg8kFj8k12U1@mid.uni-berlin.de>

Jasiu schrieb:
> Hi guys,
> 
> I have a question about setup.py and setup.cfg:
> 
> I work in a company and we use Subversion to keep our stuff. We have a
> post-commit rule that does the following: whenever there is a commit
> to /tags/ directory, a binary package is built automatically. The
> tag's name is the new version of the package, i.e. tag names are
> something like /tags/1.5.2, /tags/1.2.3 etc. We use setup.py to create
> packages. In setup.py we set the version of the package by specifying
> 'version' keyword argument to setup function. We have automated builds
> and our post-commit script does kind of ugly regexp hack and replaces
> string "version='...'" with version that is guessed from the tag name.
> And I wonder: It would be much cleaner if the version could be placed
> in the setup.cfg file. Is that possible?

I don't think so. But there are several other options:

  - install pysvn & use that in setup.py to extract the tag from the 
working-copy, making it part of version

  - instead of the dirty hack, use an a little bit less ugly hack to 
write that version to a file in the WC, and open & read that within setup.py

Diez


From lists at cheimes.de  Mon Feb  9 15:02:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 21:02:01 +0100
Subject: thread. question
In-Reply-To: <1234193642.7630.63.camel@tim-laptop>
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
	<1234193642.7630.63.camel@tim-laptop>
Message-ID: <gmq23p$dt3$1@ger.gmane.org>

Tim Wintle schrieb:
> Thanks for both replies,
> 
> On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
>> You shouldn't use the thread module directly. It's not meant to be used
>> by a user. Please stick to the threading module. You won't notice a
>> slowdown, trust me :)
> I'm aware that thread is being renamed to _thread in python 3.0, but is
> it being depricated or anything like that?
> 
> This is for an app that has been running for quite a long time and it's
> now time for fairly heavy optimisations as load is increasing (Believe
> me, I wouldn't have been looking at the C otherwise) - so I'll see if I
> do notice any effect with threading.

[snip]

> Thanks for the info - I'm very aware of the GIL, but had never looked at
> the implementation before and for some reason thought that python's
> threads were in userspace.
> 
> I'm already using a multiple-process architecture overall, but using
> threads to avoid waiting when handling SQL and TCP.

The module was renamed to _thread to stop people from using it directly.
The extension module is the interface to some low level types and
functions. Especially the usage of thread.start_new_thread is
problematic, since it bypasses Python's high level threading API.

For the rest I have to agree with Jean-Paul. If you need performance
don't use threads! Threads and performance are orthogonal -- sometimes
they are even contradictorily.



From andrew at acooke.org  Mon Feb  9 15:07:41 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 9 Feb 2009 17:07:41 -0300 (CLST)
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <c80737c4e49dc894637c7e7db20ba359.squirrel@localhost>


If I were experimenting with Python to see just how far I could push
coroutines at the moment, I would use .send() and look at how I could
factor things into a small library (containing, for example, your
trap-and-response secondary generator).

But if this was paid work, I would write a class with a __next__ method
and do things explicitly.

In answer to your PS, via a roundabout route: I've done something similar
recently by using .throw() to raise an exception in the body of the
generator.  This was done with a reset() function.  So, for example:

  mygen = ...
  a = next(mygen)
  b = next(mygen)
  reset(mygen)
  c = next(mygen)

And in the generator:

  while True:
    try:
      ...
      yield ...
    catch ResetException:
      yield # discarded by the reset function

And finally:

  def reset(gen):
    gen.throw(ResetException())

In that case, I needed an extra "yield" that did nothing.

Andrew


Aaron Brady wrote:
> Hello,
>
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started.  My question is, is it
> better to wrap the generator in an object, so that the parameters can
> be changed just by an attribute access?  Or keep the generator clear,
> and modify parameters with a 'send' call?
>
> P.S.  It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
> generator?
>
> Thanks sincerely as always.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From rt8396 at gmail.com  Mon Feb  9 15:08:17 2009
From: rt8396 at gmail.com (r)
Date: Mon, 9 Feb 2009 12:08:17 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org>
Message-ID: <fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com>

On Feb 9, 1:33?pm, Stef Mientki <stef.mien... at gmail.com> wrote:

> Maya ?
> Blender ?

> I forgot:
> pySoy
> Intensity

Thanks Stef,
I actually got OpenGL to install(finally) and now i am thinking ?
maybe? i should just go with OpenGL using the wxglcanvas. I have been
also "messing" around with Bender but i think i want a stand alone
application here. I don't know anything about Maya however?

Thanks for the info and feel free to offer more.


From philip at semanchuk.com  Mon Feb  9 15:38:17 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 9 Feb 2009 15:38:17 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <gmq0hi$8gv$1@ger.gmane.org>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>
	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
	<gmq0hi$8gv$1@ger.gmane.org>
Message-ID: <BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>


On Feb 9, 2009, at 2:35 PM, Christian Heimes wrote:

> Philip Semanchuk wrote:
>> I didn't know there *was* such a thing. Thanks for the tip! For those
>> who might be interested, the list is here:
>> http://mail.python.org/mailman/listinfo/capi-sig
>>
>>
>> FYI, I got my code working and it is in the latest release of  
>> posix_ipc:
>> http://semanchuk.com/philip/posix_ipc/
>>
>> The function MessageQueue_request_notification() does some necessary
>> setup and the function process_notification() does the rest of the  
>> work.
>
> Let me guess. You either forgot to start Python's threading system or
> you didn't register you thread with Python. You need to deal with
> PyThread_init_thread(), PyEval_InitThreads(), PyThreadState_New(),
> PyThreadState_Clear() and PyThreadState_DeleteCurrent(). The module
> Modules/threadmodule.c contains some examples.

Yes, that's accurate except for the word "forgot". To forget something  
one must first know it. =) I found the threading API documentation  
difficult to follow, but I suppose that what I'm doing is a little  
unusual so if it is not well-documented territory, that's what I get  
for wandering off the map.




From denis.spir at free.fr  Mon Feb  9 15:43:31 2009
From: denis.spir at free.fr (spir)
Date: Mon, 9 Feb 2009 21:43:31 +0100
Subject: compound regex
Message-ID: <20090209214331.7e3c0662@o>

Hello,

(new here)

Below an extension to standard module re. The point is to allow writing and testing sub-expressions individually, then nest them into a super-expression. More or less like using a parser generator -- but keeping regex grammar and power.
I used the format {sub_expr_name}: as in standard regexes {} are only used to express repetition number, a pair of curly braces nesting an identifier should not conflict.

The extension is new, very few tested. I would enjoy comments, critics, etc. I would like to know if you find such a feature useful. You will probably find the code simple enough ;-) 

Denis
------
la vida e estranya

===============
# coding: utf-8

''' 	super_regex
	
	Define & check sub-patterns individually,
	then include them in global super-pattern.
	
	uses format {name} for inclusion:
		sub1 = Regex(...)
		sub2 = Regex(...)
		super_format = "...{sub1}...{sub2}..."
		# final regex object:
		super_regex = superRegex(super_format)
	'''

from re import compile as Regex

# sub-pattern inclusion format
sub_pattern = Regex(r"{[a-zA-Z_][a-zA-Z_0-9]*}")

# sub-pattern expander
def sub_pattern_expansion(inclusion, dic=None):
	name = inclusion.group()[1:-1]
	### namespace dict may be specified -- else globals()
	if dic is None:
		dic = globals()
	if name not in dic:
		raise NameError("Cannot find sub-pattern '%s'." % name)
	return dic[name].pattern

# super-pattern generator
def superRegex(format):
	expanded_format = sub_pattern.sub(sub_pattern_expansion, format)
	return Regex(expanded_format)

if __name__ == "__main__": # purely artificial example use
	# pattern
	time = Regex(r"\d\d:\d\d:\d\d")	# hh:mm:ss
	code = Regex(r"\S{5}")			# non-whitespace x 5
	desc = Regex(r"[\w\s]+$")		# alphanum|space --> EOL
	ref_format = "^ref: {time} #{code} --- {desc}"
	ref_regex = superRegex(ref_format)
	# output
	print 'super pattern:\n"%s" ==>\n"%s"\n' % (ref_format,ref_regex.pattern)
	text = "ref: 12:04:59 #%+.?% --- foo 987 bar"
	result = ref_regex.match(text)
	print 'text: "%s" ==>\n"%s"' %(text,result.group())


From fredbasset1000 at gmail.com  Mon Feb  9 15:53:45 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Mon, 9 Feb 2009 12:53:45 -0800 (PST)
Subject: problem with import path on a python C extension
Message-ID: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>

Hi All,

I've written a simple Python extension module in C, but Python is
having problems trying to locate it when I import it into an existing
Python file.  In my example, I wrote a C extension called "diomodule"
which exists in the directory : /root/project/drivers/dio/
diomodule.c.  It has compiled fine and I end up with a diomodule.so
file in that same directory.  I have problems when trying to import it
into another Python file however, e.g. in a file /root/project/daemon/
daemon.py I tried to import it with "import
project.drivers.dio.diomodule".  Python throws an error however when I
try to call one of the functions:

  File "/root/project/daemon/daemon.py", line 115,
in ?
    diomodule.init
()
NameError: name 'diomodule' is not defined

I can only get it to work if I copy the .so file to the directory
where daemon.py is and change the import to "import diomodule".

So my question is why can't Python locate the new extension module
when I try to import it with "import project.drivers.dio.diomodule"?

Thanks for any responses,
Fred


From rantingrick at gmail.com  Mon Feb  9 15:58:44 2009
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 9 Feb 2009 12:58:44 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
Message-ID: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>

Hello all,

It has long been my dream to create an open source 3D CAD program and
i am starting to crawl my way into the first steps. I now believe i am
ready to start this endeavor and i am currently looking for fellow
Python programmers (no matter what skill level) to get started
brainstorming this design.

I have a real good idea of the UI design and at this point i just want
to start simple and build this thing. I figure this will be a good
learning experience for myself and others and in the process i can
realize my dream. And if all this turns out to be is a learning
experience, well nobody lost.

Of course Python will limit the speed here, but at this point i want
to get a template up and running. Speed does not matter at this point,
and optimizations can come along later as i am sure a few complete re-
writes are inevitable :)

My initial start will cover a very simple user interface something
like VPython but much more usable as a CAD modeler. From the start
just a few simple primitives (faces, lines-segments) that will be the
building blocks for more complex models like (arcs, rectangles,
circles, polygons, cubes, spheres, etc..).

There will need to be mouse picking as i see this application as a
very interactive environment. Of course in the beginning all
interaction will most likely be in a command line type manner until
the functionality can be worked out.

There will need to be a hierarchy of instancing and grouping within
the model to facilitate easy transformation of entities within the
model.

I am not too worried about any sort of texturing at this point. I want
to squeeze as much speed as possible and prettiness will come in due
course. I also have no plans for layering, or multiple scenes at this
time. Simple functionality is the end game here.

Once the UI is there and the modeling work flow is worked out,
everything should be a component add-on from there.

So the main points are...

#-- Entities --#
 face
 line-segment

#-- Hierarchy --#
 Entity (one face, or line-segment)
 Group (contained of multiple entities that can be translated,
rotated, scaled as one)
 Instance (component definition)

#-- Tools --#
 line
 rect
 circle
 arc
 select
 rotation
 translation
 scale
 extrusion along path
 measurement


So there it is. Any takers? :)




From lists at cheimes.de  Mon Feb  9 15:59:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 21:59:32 +0100
Subject: Calling into Python from a C thread
In-Reply-To: <BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>	<gmq0hi$8gv$1@ger.gmane.org>
	<BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
Message-ID: <gmq5fk$rdh$1@ger.gmane.org>

Philip Semanchuk wrote:
> Yes, that's accurate except for the word "forgot". To forget something
> one must first know it. =) I found the threading API documentation
> difficult to follow, but I suppose that what I'm doing is a little
> unusual so if it is not well-documented territory, that's what I get for
> wandering off the map.

I see. Apparently the threading and embedding docs don't cover your
case. The docs at
http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock
and http://docs.python.org/extending/embedding.html should explain how
and when to initialize Python threads. Please report a documentation bug
at http://bugs.python.org/.

Christian

PS: I know a great way to learn more about Python's internal threading
CAPI: fix your code, test it and attach a doc patch to your bug report.
*hint* :)



From carsten.haese at gmail.com  Mon Feb  9 16:02:22 2009
From: carsten.haese at gmail.com (Carsten Haese)
Date: Mon, 09 Feb 2009 16:02:22 -0500
Subject: problem with import path on a python C extension
In-Reply-To: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
References: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
Message-ID: <yR0kl.15830$YU2.6573@nlpi066.nbdc.sbc.com>

fredbasset1000 at gmail.com wrote:
> [...]
> So my question is why can't Python locate the new extension module
> when I try to import it with "import project.drivers.dio.diomodule"?
This import statement binds the module to the name
"project.drivers.dio.diomodule". It does not bind anything to the name
"diomodule", which is the name you want to use to refer to the module.

To bind the "diomodule" name to this module, you can do one of two things:

1:
   from project.drivers.dio import diomodule

2:
   import project.drivers.dio.diomodule
   diomodule = project.drivers.dio.diomodule

Hope this helps,

--
Carsten Haese
http://informixdb.sourceforge.net


From carsten.haese at gmail.com  Mon Feb  9 16:08:46 2009
From: carsten.haese at gmail.com (Carsten Haese)
Date: Mon, 09 Feb 2009 16:08:46 -0500
Subject: problem with import path on a python C extension
In-Reply-To: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
References: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
Message-ID: <zX0kl.15832$YU2.6961@nlpi066.nbdc.sbc.com>

fredbasset1000 at gmail.com wrote:
> I can only get it to work if I copy the .so file to the directory
> where daemon.py is and change the import to "import diomodule".

And to supplement my previous reply, another solution is to make sure
that /root/project/drivers/dio is in your PYTHONPATH. Then you can
simply "import diomodule" and refer to the module by the name "diomodule".

HTH,

--
Carsten Haese
http://informixdb.sourceforge.net


From martin at marcher.name  Mon Feb  9 17:13:57 2009
From: martin at marcher.name (Martin)
Date: Mon, 9 Feb 2009 23:13:57 +0100
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
Message-ID: <5fa6c12e0902091413s182c07c6jc5c3a3f9b6b0c15c@mail.gmail.com>

Hi,

2009/2/9 todpose at hotmail.com <todpose at hotmail.com>:
> I'm trying to write a program that puts asterisks around the input text
> using while loop.
> I can do this without using while loop, but how can you do that using while
> loop?
>
> Example:
>
> Enter a string: Hello world
>
> **********
> *Hello world*
> **********

Since others have posted so helpful answer I'm just going to rant:

1) http://docs.python.org/ <- first part (make sure you read the docs
-- and tutorial -- for the python version you installed
2) After you know how to store user input in a variable think about
what other facts you know (by examining the content of the variable)
2) Think again hard what you need to output and which parts of the
output need to match the information you already have (by doing point
2)

That shouldn't be too hard

hth
Martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From duane.kaufman at gmail.com  Mon Feb  9 17:49:45 2009
From: duane.kaufman at gmail.com (TheSeeker)
Date: Mon, 9 Feb 2009 14:49:45 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org> 
	<fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com>
Message-ID: <63721531-a4de-4103-92a8-b87933df3b22@o2g2000prl.googlegroups.com>

On Feb 9, 2:08?pm, r <rt8... at gmail.com> wrote:
> On Feb 9, 1:33?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>
> > Maya ?
> > Blender ?
> > I forgot:
> > pySoy
> > Intensity
>
> Thanks Stef,
> I actually got OpenGL to install(finally) and now i am thinking ?
> maybe? i should just go with OpenGL using the wxglcanvas. I have been
> also "messing" around with Bender but i think i want a stand alone
> application here. I don't know anything about Maya however?
>
> Thanks for the info and feel free to offer more.

Hi,

Have you considered OpenCascade:
http://www.opencascade.org/

Along with its python bindings, it might be a good alternative:
http://www.pythonocc.org/

Just a thought,
Duane


From cptn.spoon at gmail.com  Mon Feb  9 17:52:16 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 14:52:16 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<mailman.9159.1234198554.3487.python-list@python.org>
Message-ID: <746e5493-17c0-4f95-84bf-154bf8655a0c@w39g2000prb.googlegroups.com>

On Feb 10, 3:29?am, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
> cptn.spoon wrote:
> > I'm trying to create an incredibly simple stock market simulator to be
> > used in a childrens classroom and I'm wondering whether someone can
> > point me in the right direction.
>
> > I basically want to be able to have a stock struct as follows:
>
> > StockName = "Test"
> > StockPriceList = (12,13,12,10,10,8,10)
> > StockRisk = 0.15
> > StockQty = 2000
>
> > And then have a StockMarket struct that can contain 1 to many Stocks.
> > I then want to be able to iterate through the stocks to perform
> > operations as such:
>
> > for Stock in StockMarket:
>
> > I'm not asking for tips on the program itself, I just can't figure out
> > how to get the data structures in place. Would I use Classes or would
> > I use dictionaries? Am I completely off the mark with this?
>
> > Apologies for such a rudimentary question...I'm very new to all this.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> If the subject is investment performance, surely your best bet is to
> hand out piggy banks.
>
> Frederic

Thank you all for your advice. It's been most helpful!

Frederic: Haha, it's more to encourage behaviour and risk management
but I agree with your sentiment!


From cptn.spoon at gmail.com  Mon Feb  9 18:10:39 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 15:10:39 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com> 
	<mailman.9129.1234167149.3487.python-list@python.org>
Message-ID: <3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>

On Feb 9, 6:48?pm, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "cptn.spoon" <cp...... at gmail.com> wrote:
>
> On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
> >Thanks Paul! I thought this might be the case. So how would I get the
> >StockMarket class instance to contain many Stock class instances and
> >then be able to iterate through them? I'm guessing the basic structure
> >would be as follows...but I think I'm wrong:
>
> >class StockMarket:
> > ?pass
>
> No.
> At this level, just use a list of instances of your Stock class.
>
> - Hendrik

How do I get a list of instances of a particular class? Is there a way
to do this dynamically?

Also, what would be the way of dynamically creating an instance of a
class based on user input (ie a user wants to create a new instance of
the Stock class via shell input)?

I'm not sure if I have the wrong mindset here.

Thanks for any help
~Phil


From lionel.keene at gmail.com  Mon Feb  9 18:20:05 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 9 Feb 2009 15:20:05 -0800 (PST)
Subject: "Super()" confusion
Message-ID: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>

Hello. I've been scouring the web looking for something to clear up a
little confusion about the use of "super()" but haven't found anything
that really helps. Here's my simple example:


class Parent:
     def __init__(self, filePath):
       .
       .
       Do some processing with "filePath"
       .
       .

class Child(Parent):
     def __init__(self, filePath):
          super(Child,self).__init__(filePath)
          .
          .
          Do some additional Child-specific processing on filePath
          .
          .

As I understand it, "super()" will invoke the initializer of the base
class. There must be something wrong with the above syntax since I'm
getting:

"super(Child,self).__init__(filePath)
TypeError: super() argument 1 must be type, not classobj"

What have I done wrong? Thanks in advance for any help.

L


From robert.kern at gmail.com  Mon Feb  9 18:26:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 09 Feb 2009 17:26:09 -0600
Subject: Simple question - stock market simulation
In-Reply-To: <3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
Message-ID: <gmqe2i$qif$1@ger.gmane.org>

On 2009-02-09 17:10, cptn.spoon wrote:
> On Feb 9, 6:48 pm, "Hendrik van Rooyen"<m... at microcorp.co.za>  wrote:
>> "cptn.spoon"<cp...... at gmail.com>  wrote:
>>
>> On Feb 9, 3:58 pm, Paul Rubin<http://phr... at NOSPAM.invalid>  wrote:
>>
>>> Thanks Paul! I thought this might be the case. So how would I get the
>>> StockMarket class instance to contain many Stock class instances and
>>> then be able to iterate through them? I'm guessing the basic structure
>>> would be as follows...but I think I'm wrong:
>>> class StockMarket:
>>>   pass
>> No.
>> At this level, just use a list of instances of your Stock class.
>>
>> - Hendrik
>
> How do I get a list of instances of a particular class? Is there a way
> to do this dynamically?

You *can*, but I highly recommend that you don't. Instead, just keep your own 
list of instances. When you make a new instance, just append it to the list (see 
below).

   all_stocks = []

> Also, what would be the way of dynamically creating an instance of a
> class based on user input (ie a user wants to create a new instance of
> the Stock class via shell input)?

Define an __init__ method on your class to initialize it from given values. Use 
raw_input() to query the user for information. Convert the text input to 
whatever objects your class needs (e.g. if the user entered "10" on the prompt, 
x=raw_input() will return the string '10', so you would do int(x) to get the 
integer 10). Now, instantiate your class with the arguments:

   the_stock = Stock(name, risk, initial_price)

And append it to your list of stocks.

   all_stocks.append(the_stock)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Mon Feb  9 18:27:18 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 09 Feb 2009 17:27:18 -0600
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <gmqe4m$qif$2@ger.gmane.org>

On 2009-02-09 17:20, Lionel wrote:
> Hello. I've been scouring the web looking for something to clear up a
> little confusion about the use of "super()" but haven't found anything
> that really helps. Here's my simple example:
>
>
> class Parent:
>       def __init__(self, filePath):
>         .
>         .
>         Do some processing with "filePath"
>         .
>         .
>
> class Child(Parent):
>       def __init__(self, filePath):
>            super(Child,self).__init__(filePath)
>            .
>            .
>            Do some additional Child-specific processing on filePath
>            .
>            .
>
> As I understand it, "super()" will invoke the initializer of the base
> class. There must be something wrong with the above syntax since I'm
> getting:
>
> "super(Child,self).__init__(filePath)
> TypeError: super() argument 1 must be type, not classobj"
>
> What have I done wrong? Thanks in advance for any help.

super() only works on the "new-style" classes introduced in Python 2.2. You need 
to make Parent subclass from object:

class Parent(object):
     ...

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb  9 18:58:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 09 Feb 2009 15:58:32 -0800
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <QeCdncJDkuExXw3UnZ2dnUVZ_juWnZ2d@pdx.net>

Lionel wrote:
> Hello. I've been scouring the web looking for something to clear up a
> little confusion about the use of "super()" but haven't found anything
> that really helps. Here's my simple example:
> 
> 
> class Parent:
>      def __init__(self, filePath):...
> 
> class Child(Parent):
>      def __init__(self, filePath):
>           super(Child,self).__init__(filePath)
>           ....
> As I understand it, "super()" will invoke the initializer of the base
> class. There must be something wrong with the above syntax since I'm
> getting:
> "super(Child,self).__init__(filePath)
> TypeError: super() argument 1 must be type, not classobj"
> 
> What have I done wrong? Thanks in advance for any help.

To use super, you must work with descendants of "object".

So, just change your first line to:
     class Parent(object):
and you should find your world back in place.

--Scott David Daniels
Scott.Daniels at Acm.Org


From deets at nospam.web.de  Mon Feb  9 19:01:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 10 Feb 2009 01:01:59 +0100
Subject: adodb has no attribute connect
In-Reply-To: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
References: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
Message-ID: <6vbufnFj957sU1@mid.uni-berlin.de>

Rahul schrieb:
> Hello all,
> 
> I have to access data from database using adodb so I did
> 
> Import adodb
> Conn=adodb.NewADOConnection("odbc")
> 
> Upto this it works properly but when I say

It does not. It returns None, thus the following error you see.

> Conn.Connect("","","")
> 
> It gives error as
> 
> [Attributrerror]: Object Nonetype has no attribute Connect.
> 
> I have Red Hat Enterprise Linux 4
> Python 2.5
> Mod_python 3.3.1


According to the docs on the (very old and seemingly not actively 
developed adodb-site), "odbc" needs the Python windows extensions. As 
you are on redheat, I have difficulties believing you make these work.

Maybe mxodbc works? Or even better, ditch that ado-stuff and connect 
directly to your database. Python's DB-API is better I guess, no need 
for this attempt at mimicking windows APIs.

Diez


From exarkun at divmod.com  Mon Feb  9 19:04:05 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 19:04:05 -0500
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>

On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.keene at gmail.com> wrote:
>Hello. I've been scouring the web looking for something to clear up a
>little confusion about the use of "super()" but haven't found anything
>that really helps. Here's my simple example:
>
> [snip]
>
>"super(Child,self).__init__(filePath)
>TypeError: super() argument 1 must be type, not classobj"
>
>What have I done wrong? Thanks in advance for any help.

Consider whether you really need to use super().

http://fuhm.net/super-harmful/

Jean-Paul


From torriem at gmail.com  Mon Feb  9 19:08:45 2009
From: torriem at gmail.com (Michael Torrie)
Date: Mon, 09 Feb 2009 17:08:45 -0700
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <4990C58D.5070808@gmail.com>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
> 
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)

Glade is very nice for generating GTK guis.  If you save in the newer
format, then GTK has a built-in api called GtkBuilder for importing the
GUI, creating it, and setting up the callbacks.

To be clear, glade-generated ui files work only with GTK, not wxPython.
 If you ever find yourself coding PyQT, the QT Designer is one of the
best GUI builders on the planet.


From lionel.keene at gmail.com  Mon Feb  9 19:18:34 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 9 Feb 2009 16:18:34 -0800 (PST)
Subject: "Super()" confusion
References: mailman.9184.1234224249.3487.python-list@python.org
Message-ID: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>

On Feb 9, 4:04?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
> >Hello. I've been scouring the web looking for something to clear up a
> >little confusion about the use of "super()" but haven't found anything
> >that really helps. Here's my simple example:
>
> > [snip]
>
> >"super(Child,self).__init__(filePath)
> >TypeError: super() argument 1 must be type, not classobj"
>
> >What have I done wrong? Thanks in advance for any help.
>
> Consider whether you really need to use super().
>
> http://fuhm.net/super-harmful/
>
> Jean-Paul

Yes, I came across that essay...and it scared me. Will my base class
initializer always get called regardless of whether or not I use super
()? If so, does this occur prior to any code in my derived class
initializer being executed (in other words, if I don't explicitly call
"super()" in my derived class, am I guaranteed that the base class
"__init__" has executed completely)? If so, then I guess I can forego
the use of "super()"


From clp2 at rebertia.com  Mon Feb  9 19:25:49 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 16:25:49 -0800
Subject: "Super()" confusion
In-Reply-To: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
References: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
Message-ID: <50697b2c0902091625x46eb2a4ejeecb8a9e8c616fb1@mail.gmail.com>

On Mon, Feb 9, 2009 at 4:18 PM, Lionel <lionel.keene at gmail.com> wrote:
> On Feb 9, 4:04 pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
>> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
>> >Hello. I've been scouring the web looking for something to clear up a
>> >little confusion about the use of "super()" but haven't found anything
>> >that really helps. Here's my simple example:
>>
>> > [snip]
>>
>> >"super(Child,self).__init__(filePath)
>> >TypeError: super() argument 1 must be type, not classobj"
>>
>> >What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>>
>> Jean-Paul
>
> Yes, I came across that essay...and it scared me. Will my base class
> initializer always get called regardless of whether or not I use super
> ()?

No, it is not called unless you /explicitly/ call it (either using
super() or manually via BaseClassName.__init__(self, other, args,
here)) in your subclass' __init__ or you don't define an __init__ for
your subclass (and it inherits __init__ from its first superclass).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From exarkun at divmod.com  Mon Feb  9 19:31:37 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 19:31:37 -0500
Subject: "Super()" confusion
In-Reply-To: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
Message-ID: <20090210003137.12853.1758503199.divmod.quotient.8052@henry.divmod.com>

On Mon, 9 Feb 2009 16:18:34 -0800 (PST), Lionel <lionel.keene at gmail.com> wrote:
>On Feb 9, 4:04?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
>> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
>> >Hello. I've been scouring the web looking for something to clear up a
>> >little confusion about the use of "super()" but haven't found anything
>> >that really helps. Here's my simple example:
>>
>> > [snip]
>>
>> >"super(Child,self).__init__(filePath)
>> >TypeError: super() argument 1 must be type, not classobj"
>>
>> >What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>>
>> Jean-Paul
>
>Yes, I came across that essay...and it scared me. Will my base class
>initializer always get called regardless of whether or not I use super
>()? If so, does this occur prior to any code in my derived class
>initializer being executed (in other words, if I don't explicitly call
>"super()" in my derived class, am I guaranteed that the base class
>"__init__" has executed completely)? If so, then I guess I can forego
>the use of "super()"

Neither the use nor disuse of super can guarantee any of these things.
Old-style base method calling (ie, "Foo.bar(self, ...)" - as opposed to
using super) is just as capable of causing these things to happen as is
super *except* in the case of diamond inheritance.  If you use either
correctly, it will do what you want.  It's just that using super correctly
is a lot harder most of the time.

Jean-Paul


From contactatishay at gmail.com  Mon Feb  9 19:40:40 2009
From: contactatishay at gmail.com (Atishay)
Date: Mon, 9 Feb 2009 16:40:40 -0800 (PST)
Subject: how to find out vesion of a python module
Message-ID: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>

I have Python Image Library installed. I do not know how to find out
its version. How can I do that?

Secondly, I get error if I say "import ImageFont"

ImportError: The _imaging C module is not installed

I have _imaging module though

[bash]# file PIL/_imaging.so

PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
(SYSV), not stripped

How could I fix this?


From cptn.spoon at gmail.com  Mon Feb  9 19:46:33 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 16:46:33 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com> 
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
	<mailman.9182.1234221985.3487.python-list@python.org>
Message-ID: <ac6f105b-42e1-4cee-bd13-8f07f7d3c221@w24g2000prd.googlegroups.com>

On Feb 10, 10:26?am, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-09 17:10, cptn.spoon wrote:
>
>
>
> > On Feb 9, 6:48 pm, "Hendrik van Rooyen"<m... at microcorp.co.za> ?wrote:
> >> "cptn.spoon"<cp...... at gmail.com> ?wrote:
>
> >> On Feb 9, 3:58 pm, Paul Rubin<http://phr... at NOSPAM.invalid> ?wrote:
>
> >>> Thanks Paul! I thought this might be the case. So how would I get the
> >>> StockMarket class instance to contain many Stock class instances and
> >>> then be able to iterate through them? I'm guessing the basic structure
> >>> would be as follows...but I think I'm wrong:
> >>> class StockMarket:
> >>> ? pass
> >> No.
> >> At this level, just use a list of instances of your Stock class.
>
> >> - Hendrik
>
> > How do I get a list of instances of a particular class? Is there a way
> > to do this dynamically?
>
> You *can*, but I highly recommend that you don't. Instead, just keep your own
> list of instances. When you make a new instance, just append it to the list (see
> below).
>
> ? ?all_stocks = []
>
> > Also, what would be the way of dynamically creating an instance of a
> > class based on user input (ie a user wants to create a new instance of
> > the Stock class via shell input)?
>
> Define an __init__ method on your class to initialize it from given values. Use
> raw_input() to query the user for information. Convert the text input to
> whatever objects your class needs (e.g. if the user entered "10" on the prompt,
> x=raw_input() will return the string '10', so you would do int(x) to get the
> integer 10). Now, instantiate your class with the arguments:
>
> ? ?the_stock = Stock(name, risk, initial_price)
>
> And append it to your list of stocks.
>
> ? ?all_stocks.append(the_stock)
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

That's exactly what I was after. Thanks Robert!


From greg.ewing at canterbury.ac.nz  Mon Feb  9 19:47:03 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 10 Feb 2009 13:47:03 +1300
Subject: ANN: SuPy 1.0 for Windows
Message-ID: <mailman.9194.1234229796.3487.python-announce-list@python.org>

SuPy 1.0 - Windows
------------------

I have created a Windows binary of SuPy.

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Currently only Python 2.3 is supported. (I'm working on a
Python 2.5 version, but there are problems.)

It has only been tested with Sketchup 7, although there's
a chance it might work with Sketchup 6 as well.

I'm not sure how stable this version will be. There is
some dodgy mixing of runtime library versions going on.
All I can say right now is that it runs the included
example without crashing on my test machine.

What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From pauljefferson at gmail.com  Mon Feb  9 19:51:59 2009
From: pauljefferson at gmail.com (PJ)
Date: Mon, 9 Feb 2009 16:51:59 -0800 (PST)
Subject: AJAX Post requests
Message-ID: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>

Hi,
I have a simple web server using  BaseHTTPServer, and the def do_POST
(self) function works fine for regular forms that are submitted to it,
but when I send an AJAX POST to it it does nothing (I've tried to just
get it to print to check it's nothing else but it doesn't even do
that, although it does for a regular POST request.
The post function is
    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            if ctype == 'multipart/form-data':
                query=cgi.parse_multipart(self.rfile, pdict)
            self.send_response(301)

            self.end_headers()
            print(query.get('data'))
            print('test')
            h = codecs.open ("log.txt", "a", encoding="utf8")
            h.write("test")
            h.close()


        except :

         pass

The AJAX post is appearing in the command prompt as any other post and
I can't see any reason why it shouldn't go to this function,
particularly if it works for a regular (non-AJAX) post, so any help
would be appreciated,
Paul


From gherron at islandtraining.com  Mon Feb  9 20:07:10 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 09 Feb 2009 17:07:10 -0800
Subject: how to find out vesion of a python module
In-Reply-To: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
Message-ID: <4990D33E.2060003@islandtraining.com>

Atishay wrote:
> I have Python Image Library installed. I do not know how to find out
> its version. How can I do that?
>   

There is no standard way.  However many module authors do include soch
information, usually in an attribute named version or __version__, or
VERSION.  PIL uses the VERSION

import Image
print Image.VERSION

> Secondly, I get error if I say "import ImageFont"
>
> ImportError: The _imaging C module is not installed
>
> I have _imaging module though
>
> [bash]# file PIL/_imaging.so
>
> PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
> (SYSV), not stripped
>
> How could I fix this?
>   

It looks like you have it installed incorrectly,   How did you install
it.  What platform/system are you on? 
PIL usually uses a PIL.pth file.  Does that exist?  Where? And what are
its contents?

Gary Herron


> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From fetchinson at googlemail.com  Mon Feb  9 20:19:41 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 9 Feb 2009 17:19:41 -0800
Subject: "Super()" confusion
In-Reply-To: <20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
Message-ID: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>

>>Hello. I've been scouring the web looking for something to clear up a
>>little confusion about the use of "super()" but haven't found anything
>>that really helps. Here's my simple example:
>>
>> [snip]
>>
>>"super(Child,self).__init__(filePath)
>>TypeError: super() argument 1 must be type, not classobj"
>>
>>What have I done wrong? Thanks in advance for any help.
>
> Consider whether you really need to use super().
>
> http://fuhm.net/super-harmful/

Did you actually read that article, understood it, went through the
tons of responses from python-dev team members, including Guido, or
simply read its title, did absolutely no serious thinking about it and
go on throwing it around as if it would prove anything?

I can't believe this "super( ) is harmful" BS is still alive, it grew
to be a mature internet meme like the dancing hamster or star wars kid
:)

See (among tons of other writings):

http://mail.python.org/pipermail/python-dev/2005-January/thread.html

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From jacob.kaplanmoss at gmail.com  Mon Feb  9 20:26:32 2009
From: jacob.kaplanmoss at gmail.com (Jacob Kaplan-Moss)
Date: Mon, 9 Feb 2009 17:26:32 -0800 (PST)
Subject: PyCon 2009: Call for sprint projects
Message-ID: <f91638b1-7634-4877-8842-80859ab589dc@v42g2000yqj.googlegroups.com>

Python-related projects: join the PyCon Development Sprints!

The development sprints are a key part of PyCon, a chance for the
contributors
to open-source projects to get together face-to-face for up to four
days of
intensive learning and development. Newbies sit at the same table as
the gurus,
go out for lunch and dinner together, and have a great time while
advancing
their project. Sprints are one of the best parts of PyCon; in 2008
over 250
sprinters came for at least one day!

If your project would like to sprint at PyCon, now is the time to let
us know.
We'll collect your info and publish it so that participants will have
time to
make plans. We'll need to get the word out early so that folks who
want to
sprint have time to make travel arrangements.

In the past, some have been reluctant to commit to sprinting: some may
not know
what sprinting is all about; others may think that they're not
"qualified" to
sprint. We're on an ongoing mission to change that perception:

* We'll help promote your sprint. The PyCon website, the PyCon blog,
the PyCon
  podcast, and press releases will be there for you.

* PyCon attendees will be asked to commit to sprints on the
registration form,
  which will include a list of sprints with links to further info.

* We will be featuring a "How To Sprint" session on Sunday afternoon,
followed
  by sprint-related tutorials, all for free. This is a great
opportunity to
  introduce your project to prospective contributors. We'll have more
details
  about this later.

* Some sponsors are helping out with the sprints as well.

There's also cost. Although the sprinting itself is free, sprints have
associated time and hotel costs. We can't do anything about the time
cost, but
we may have some complimentary rooms and funding available for
sprinters. We
will have more to say on financial aid later.

Those who want to lead a sprint should send the following information
to pycon-organizers at python.org:

* Project/sprint name

* Project URL

* The name and contact info (email and/or telephone) for the sprint
leader(s)
  and other contributors who will attend the sprint

* Instructions for accessing the project's code repository and
documentation (or
  a URL)

* Pointers to new contributor information (setup, etc.)

* Any special requirements (projector? whiteboard? flux capacitor?)

We will add this information to the PyCon website and set up a wiki
page for you
(or we can link to yours). Projects should provide a list of goals
(bugs to fix,
features to add, docs to write, etc.), especially some goals for
beginners, to
attract new sprinters. The more detail you put there, the more
prepared your
sprinters will be, and the more results you'll get.

In 2008 there were sprints for Python, TurboGears, Pylons, Django,
Jython, WSGI,
PyGame, Bazaar, Trac, PyCon-Tech, OLPC, Orbited, PyPy, Grok, and many
others. We
would like to see all these and more!

Sprints will start with an introductory session on Sunday, March 29;
this
session will begin immedately after PyCon's scheduled portion ends.
The sprints
themselves will run from Monday, March 30 through Thursday, April 2,
2009.

You can find all these details and more at http://us.pycon.org/2009/sprints/.

If you have any questions, feel free to contact me directly.
Thank you very much, and happy coding!

Jacob Kaplan-Moss
<jacob at jacobian.org>


From exarkun at divmod.com  Mon Feb  9 20:27:39 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 20:27:39 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
Message-ID: <20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>

On Mon, 9 Feb 2009 17:19:41 -0800, Daniel Fetchinson <fetchinson at googlemail.com> wrote:
>>>Hello. I've been scouring the web looking for something to clear up a
>>>little confusion about the use of "super()" but haven't found anything
>>>that really helps. Here's my simple example:
>>>
>>> [snip]
>>>
>>>"super(Child,self).__init__(filePath)
>>>TypeError: super() argument 1 must be type, not classobj"
>>>
>>>What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>
>Did you actually read that article, understood it, went through the
>tons of responses from python-dev team members, including Guido

Yes.  Why the knee-jerk reaction?  I simply pointed out a resource which
might be helpful to someone trying to learn to use super.

Jean-Paul


From fetchinson at googlemail.com  Mon Feb  9 20:34:05 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 9 Feb 2009 17:34:05 -0800
Subject: "Super()" confusion
In-Reply-To: <20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
Message-ID: <fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>

>>>>Hello. I've been scouring the web looking for something to clear up a
>>>>little confusion about the use of "super()" but haven't found anything
>>>>that really helps. Here's my simple example:
>>>>
>>>> [snip]
>>>>
>>>>"super(Child,self).__init__(filePath)
>>>>TypeError: super() argument 1 must be type, not classobj"
>>>>
>>>>What have I done wrong? Thanks in advance for any help.
>>>
>>> Consider whether you really need to use super().
>>>
>>> http://fuhm.net/super-harmful/
>>
>>Did you actually read that article, understood it, went through the
>>tons of responses from python-dev team members, including Guido
>
> Yes.  Why the knee-jerk reaction?

Because throwing around that link carries about the same amount of
information as "perl is better than python", "my IDE is better than
yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

> I simply pointed out a resource which
> might be helpful to someone trying to learn to use super.

It will certainly not be helpful to anyone trying to learn the usage
of super. The person who wrote that essay is simply misunderstanding
the concept, as has been explained countless times by the python dev
team. Hence, it only increases confusion, adds to the noise and
spreads false alarm.

Honestly, I don't understand how this thing got so much out of
control. If anyone starts an intelligent question or remark about
super, this essay is thrown in no matter what. Anyone can explain why?

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From cs at zip.com.au  Mon Feb  9 20:38:06 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 10 Feb 2009 12:38:06 +1100
Subject: wsdl2py/ZSI and complex types with arrays
In-Reply-To: <4989ba74$0$24592$da0feed9@news.zen.co.uk>
Message-ID: <20090210013806.GA29349@cskk.homeip.net>

On 04Feb2009 15:55, eviljonny <how at about.no.com> wrote:
| I have been trying to write a web service using ZSI with wsdl2py. I have 
| read 'The Zolera Soap Infrastructure User?s Guide Release 2.0.0' and some 
| older guides (a guide by Nortel called Using ZSI with wsdl2py) and am 
| unable to find any working examples of how to use arrays in complex 
| types. I have a Request method which takes an array as an argument and 
| responds with an array.
[...]
| Can anyone provide me an example (or a link to an example) of how to 
| populate the arrays in complex types? Even pointing me in the right 
| direction would be wonderful.

I am by no means a ZSI expert. You may do better to join this list:
  https://lists.sourceforge.net/lists/listinfo/pywebsvcs-talk
and ask there.

Glancing at some code using ZSI-2.1-a1 here I've got code like this:

  # MR refers to a complex type with a <loginResultList> component,
  # and that contains a list of <item> elements
  LRL = MR._loginResultList = MR.new_loginResultList()
  LRL._item = []
  for LI in RQ.get_element_LoginList():
    class item:
      ... fill in some class attributes ...
    LRL._item.append(item)

thus populating the <loginResultList> with <item> elements.
("item" is only a class for the convenience of having _foo attributes easy to
assign to).

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743


From contactatishay at gmail.com  Mon Feb  9 20:50:25 2009
From: contactatishay at gmail.com (Atishay)
Date: Mon, 9 Feb 2009 17:50:25 -0800 (PST)
Subject: how to find out vesion of a python module
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
	<mailman.9188.1234228035.3487.python-list@python.org>
Message-ID: <90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>


>
> There is no standard way. ?However many module authors do include soch
> information, usually in an attribute named version or __version__, or
> VERSION. ?PIL uses the VERSION
>
> import Image
> print Image.VERSION

Thank you very much. This works

>
> > Secondly, I get error if I say "import ImageFont"
>
> > ImportError: The _imaging C module is not installed
>
> > I have _imaging module though
>
> > [bash]# file PIL/_imaging.so
>
> > PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
> > (SYSV), not stripped
>
> > How could I fix this?
>
> It looks like you have it installed incorrectly, ? How did you install
> it. ?What platform/system are you on?
> PIL usually uses a PIL.pth file. ?Does that exist? ?Where? And what are
> its contents?

I think it is installed correctly. Here is why.

If I do export LD_LIBRARY_PATH="/usr/local/lib:$LD_LIBRARY_PATH"
now if I run python and say "import ImageFont", it works correctly.

contents of PIL.pth
[bash]#cat PIL.pth
PIL

[atishay at borel site-packages]$ ls PIL.pth
PIL.pth
[atishay at borel site-packages]$ ls -d PIL
PIL

Now the point is, how do I avoid setting LD_LIBRARY_PATH everytime for
python? I know I can write a bash script, but I am sure python would
have some feature that I can tweak to make it work.

Regards

Atishay

>
> Gary Herron
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>



From exarkun at divmod.com  Mon Feb  9 20:59:36 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 20:59:36 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
Message-ID: <20090210015936.12853.1154494242.divmod.quotient.8101@henry.divmod.com>

On Mon, 9 Feb 2009 17:34:05 -0800, Daniel Fetchinson <fetchinson at googlemail.com> wrote:
>>>>>Hello. I've been scouring the web looking for something to clear up a
>>>>>little confusion about the use of "super()" but haven't found anything
>>>>>that really helps. Here's my simple example:
>>>>>
>>>>> [snip]
>>>>>
>>>>>"super(Child,self).__init__(filePath)
>>>>>TypeError: super() argument 1 must be type, not classobj"
>>>>>
>>>>>What have I done wrong? Thanks in advance for any help.
>>>>
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>>Did you actually read that article, understood it, went through the
>>>tons of responses from python-dev team members, including Guido
>>
>> Yes.  Why the knee-jerk reaction?
>
>Because throwing around that link carries about the same amount of
>information as "perl is better than python", "my IDE is better than
>yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

That's not true.  The page contains lots of information.

>> I simply pointed out a resource which
>> might be helpful to someone trying to learn to use super.
>
>It will certainly not be helpful to anyone trying to learn the usage
>of super. The person who wrote that essay is simply misunderstanding
>the concept, as has been explained countless times by the python dev
>team. Hence, it only increases confusion, adds to the noise and
>spreads false alarm.

Quoting Guido, in whom you seem to place a lot of faith:

  Super is intended for use that are designed with method cooperation in
  mind, so I agree with the best practices in James's Conclusion:

  """
    * Use it consistently, and document that you use it,
      as it is part of the external interface for your class, like it or not.
    * Never call super with anything but the exact arguments you received,
      unless you really know what you're doing.
    * When you use it on methods whose acceptable arguments can be
      altered on a subclass via addition of more optional arguments,
      always accept *args, **kw, and call super like
      "super(MyClass, self).currentmethod(alltheargsideclared, *args,
**kwargs)".
      If you don't do this, forbid addition of optional arguments in subclasses.
    * Never use positional arguments in __init__ or __new__.
      Always use keyword args, and always call them as keywords,
      and always pass all keywords on to super.
  """

The original poster's code did not use it consistently, did not document its use, and used positional arguments in __init__.  So according to Guido, the
OP was misusing super.  Why are you complaining that I pointed this out?

>Honestly, I don't understand how this thing got so much out of
>control. If anyone starts an intelligent question or remark about
>super, this essay is thrown in no matter what. Anyone can explain why?

You're seriously overreacting.

Jean-Paul


From benjamin at python.org  Mon Feb  9 21:02:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 10 Feb 2009 02:02:43 +0000 (UTC)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
Message-ID: <loom.20090210T020048-489@post.gmane.org>

Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> Consider whether you really need to use super().
> 
> http://fuhm.net/super-harmful/

This article chiefly deals with super()'s harm in multiple inteheritance
situations. For the simple case, though, like that presented by the OP, I
believe super() is perfect.






From samslists at gmail.com  Mon Feb  9 21:19:10 2009
From: samslists at gmail.com (Sam)
Date: Mon, 9 Feb 2009 18:19:10 -0800 (PST)
Subject: codecs.open and buffering modes...
Message-ID: <56a55b5c-ca64-4c84-a8a8-3912af384e4c@f40g2000pri.googlegroups.com>

codecs.open defaults to line buffering.  But open defaults to using
the system buffer size.  Why the discrepancy?  Is it different for a
reason?

How do these choices affect performance?  (Particularly under Linux).

Thanks


From danielzhou86 at gmail.com  Mon Feb  9 21:54:46 2009
From: danielzhou86 at gmail.com (Daniel Zhou)
Date: Tue, 10 Feb 2009 10:54:46 +0800
Subject: python-list
Message-ID: <8bd9daa20902091854y318a09axe118ebda838b17da@mail.gmail.com>

python-list
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From joe at socallinuxexpo.org  Mon Feb  9 21:55:54 2009
From: joe at socallinuxexpo.org (joe at socallinuxexpo.org)
Date: Mon, 9 Feb 2009 18:55:54 -0800 (PST)
Subject: Python at the SoCal Linux Expo
Message-ID: <48917.75.19.166.49.1234234554.squirrel@socallinuxexpo.org>

Hey guys,

The Southern California Linux Expo, a community run conference taking
place in Los Angeles on February 20th to 22nd, is offering a 50% discount
to the Python community. When you go to register[1], just enter the promo
code: PYTHN. If you have any questions, please let me know.

Thanks!
Joe Smith
Southern California Linux Expo

[1] https://socallinuxexpo.org/reg7/





From spacebar265 at gmail.com  Mon Feb  9 22:10:28 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Mon, 9 Feb 2009 19:10:28 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
Message-ID: <203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>

On Feb 9, 5:13?pm, Steve Holden <st... at holdenweb.com> wrote:
> Spacebar265 wrote:
> > On Feb 7, 2:17 am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
> >> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
> >>> Hi. Does anyone know how to scan a filecharacterbycharacterand
> >>> have eachcharacterso I can put it into a variable. I am attempting
> >>> to make a chatbot and need this to read the saved input to look for
> >>> spelling mistakes and further analysis of user input.
> >> That does not follow. To analyze a text, the worst possible starting
> >> point is one variable for eachcharacter(what would you call them --
> >> character_1, character_2, ... character_65802 ?)
>
> I believe most people would read the input a line at a time and split
> the lines into words. It does depend whether you are attempting
> real-time spelling correction, though. That would be a different case.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Thanks. How would I do separate lines into words without scanning one
character at a time?


From kp8 at mac.com  Mon Feb  9 22:26:56 2009
From: kp8 at mac.com (kpp9c)
Date: Mon, 9 Feb 2009 19:26:56 -0800 (PST)
Subject: Python Launcher.app on OS X
Message-ID: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>

I am very confused about the current state of Python on OS X 10.5.
Looks like Apple ships with 2.5.1 and that is also the latest
installer for OS 10.5. The notes on the wiki page found here:

http://wiki.python.org/moin/MacPython/Leopard

Say:

Mac OS X 10.5.x (Leopard) comes with the 2.5.1 Python distribution pre-
installed, with an integrated Python Launcher.app

[...]

It is recommended that you delete the newly installed Python
Launcher.app, because it is already present inside the system
Python.framework. If you have installed Apple's developer tools (Xcode
et al), it is recommended that you delete the newly installed Build
Applet.app, because it is already present in /Developer/Applications/
Utilities/MacPython 2.5.

okay... for the life of me i do not see any Python Launcher.app and i
just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
installed the dev kit.

Where the heck is this application?

best,

kp




From gagsl-py2 at yahoo.com.ar  Mon Feb  9 22:29:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 01:29:42 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
Message-ID: <op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson  
<fetchinson at googlemail.com> escribi?:

>>>>> Hello. I've been scouring the web looking for something to clear up a
>>>>> little confusion about the use of "super()" but haven't found  
>>>>> anything
>>>>> that really helps. Here's my simple example:
>>>>>
>>>>> [snip]
>>>>>
>>>>> "super(Child,self).__init__(filePath)
>>>>> TypeError: super() argument 1 must be type, not classobj"
>>>>>
>>>>> What have I done wrong? Thanks in advance for any help.
>>>>
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>> Did you actually read that article, understood it, went through the
>>> tons of responses from python-dev team members, including Guido
>>
>> Yes.  Why the knee-jerk reaction?
>
> Because throwing around that link carries about the same amount of
> information as "perl is better than python", "my IDE is better than
> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

Not at all. It contains accurate and valuable information that isn't  
available elsewhere.

>> I simply pointed out a resource which
>> might be helpful to someone trying to learn to use super.
>
> It will certainly not be helpful to anyone trying to learn the usage
> of super. The person who wrote that essay is simply misunderstanding
> the concept, as has been explained countless times by the python dev
> team. Hence, it only increases confusion, adds to the noise and
> spreads false alarm.

AFAIK, all facts appearing in said article are still true (except for 3.x  
which uses a shorter form). If super usage had been clearly documented in  
the first place, this had not happened.
Perhaps you could point us to some resource explaining how is super  
supposed to be used correctly?
And of those giving explanations in python-dev, nobody cared to add a  
single word to the Python documentation for years.

> Honestly, I don't understand how this thing got so much out of
> control. If anyone starts an intelligent question or remark about
> super, this essay is thrown in no matter what. Anyone can explain why?

Because for a very loooooong time (seven years, 2001-2008) super was  
almost undocumented. The Library Reference -before release 2.6- only had a  
short paragraph, the online documentation referred (and still does) to the  
original essay by Guido introducing descriptors, which is inaccurate and  
outdated, and then the "... harmful" article was the only source of  
information available.
Worse was the fate of packages and how they're imported: nobody "could be  
bothered to spell that out" (sic); or how import works in general, still  
barely documented (one has to dig into the PEP collection, trying to guess  
what parts are truly implemented and what parts are only a wish...)

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 22:46:52 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 03:46:52 GMT
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<mailman.9191.1234229649.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>

On Mon, 09 Feb 2009 17:34:05 -0800, Daniel Fetchinson wrote:

...
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>>Did you actually read that article, understood it, went through the
>>>tons of responses from python-dev team members, including Guido

"Tons" of responses?

I count 16, about a third of which are written by James Knight himself 
(the author of the page you are ranting against), and of the remaining, 
about half are low-to-zero information content, e.g. Tim Peter's joke 
about renaming the page for better marketing value.

It's especially telling that even Guido, the most vocal critic of the 
article, is critical of the *title* but not the content. In his first 
post, he says: "I agree with the best practices in James's 
Conclusion...", and suggested that if the article was called "Multiple 
Inheritance Pitfalls in Python" he'd be much happier.


>> Yes.  Why the knee-jerk reaction?
> 
> Because throwing around that link carries about the same amount of
> information as "perl is better than python", "my IDE is better than
> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

This is clearly not the case when even the most vocal critic agrees with 
the article's recommendations.


>> I simply pointed out a resource which might be helpful to someone
>> trying to learn to use super.
> 
> It will certainly not be helpful to anyone trying to learn the usage of
> super. 

I've read it, and found it very useful.


> The person who wrote that essay is simply misunderstanding the
> concept, as has been explained countless times by the python dev team.

"Countless". Is that more or less than the "tons of responses" above?


> Hence, it only increases confusion, adds to the noise and spreads false
> alarm.

So you say.


> Honestly, I don't understand how this thing got so much out of control.
> If anyone starts an intelligent question or remark about super, this
> essay is thrown in no matter what. Anyone can explain why?

Because inheritance is potentially confusing. Multiple inheritance is 
even more confusing. Multiple inheritance with diamond diagrams even more 
so, and multiple inheritance with diamond diagrams and non-cooperative 
classes are simply impossible to get right.

Because there are many pitfalls to inheritance in Python, and they aren't 
obvious: who on earth would imagine that calling __init__ or __new__ with 
positional arguments could be dangerous? James Knight's article is a well-
written, understandable description of some of them, in one place and 
with a catchy title. Of course people are going to link to it.

And finally, because people do wrongly get the impression that using 
super will magically make those problems go away. I know this, because I 
was one of them.

(I went through the anger period, sure that Knight must be full of it. 
How could anyone suggest that Guido made a super that isn't perfect? I 
got past that once I realised just how complex inheritance actually is. 
Currently I'm in denial, writing code with super and hoping that it will 
Just Work but not pushing it too hard in case it doesn't.)



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 22:49:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 03:49:03 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
Message-ID: <pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>

On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:

> How would I do separate lines into words without scanning one character
> at a time?

Scan a line at a time, then split each line into words.


for line in open('myfile.txt'):
    words = line.split()


should work for a particularly simple-minded idea of words.



-- 
Steven


From rt8396 at gmail.com  Tue Feb 10 00:05:28 2009
From: rt8396 at gmail.com (r)
Date: Mon, 9 Feb 2009 21:05:28 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org> 
	<fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com> 
	<63721531-a4de-4103-92a8-b87933df3b22@o2g2000prl.googlegroups.com>
Message-ID: <0a805ebf-0b8e-44ea-9e87-579960466623@x9g2000yqk.googlegroups.com>

OpenCascade looks promising. I had look at this before a while back
and forgot about it. For now i am taking the OpenGL plunge and I will
see where that takes me...?

Thanks Duane


From research at johnohagan.com  Tue Feb 10 00:14:19 2009
From: research at johnohagan.com (John O'Hagan)
Date: Tue, 10 Feb 2009 05:14:19 +0000
Subject: Small socket problem
In-Reply-To: <op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>
References: <200902090943.36445.research@johnohagan.com>
	<op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <200902100514.19632.research@johnohagan.com>

On Mon, 9 Feb 2009, Gabriel Genellina wrote:
> En Mon, 09 Feb 2009 07:43:36 -0200, John O'Hagan <research at johnohagan.com>
>
> escribi?:
> > I'm using the socket module (python 2.5) like this (where 'options'
> > refers to
> > an optparse object) to connect to the Fluidsynth program:
> >
> >             host = "localhost"
> >             port = 9800
> >             fluid = socket(AF_INET, SOCK_STREAM)
> >             try:
> >                 fluid.connect((host, port))  #Connect if fluidsynth is
> > running
> >             except BaseException:
> >                 print "Connecting to fluidsynth..." #Or start fluidsynth
> >                 soundfont =  options.soundfont
> >                 driver = options.driver
> >                 Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
> >                 "-C", "1",  "-R", "1", "-l", "-a", driver, "-j",
> > soundfont])
> >                 timeout = 50
> >                 while 1:
> >                     timeout -= 1
> >                     if timeout == 0:
> >                         print "Problem with fluidsynth: switching to
> > synth."
> >                         play_method = "synth"
> >                         break
> >                     try:
> >                         fluid.connect((host, port))
> >                     except BaseException:
> >                         sleep(0.05)
> >                         continue
> >                     else:
> >                         break
> >
> > (I'm using BaseException because I haven't been able to discover what
> > exception class[es] socket uses).
>
> Usually socket.error, which is a subclass of IOError, but others might
> happen too I think. In any case, the most generic except clause you should
> use is
> try:
> except Exception: ...
> (because you usually don't want to catch KeyboardInterrupt nor SystemExit,
> that is, let Ctrl-C and sys.exit() do their work)

Thanks, I had been doing "from socket import foo, bar" without 
importing "error", that now works. I think I should use that specific 
exception in the try clause for now so I can see any other exceptions that 
may occur, a good idea?

>
> > The problem is that this fails to connect ( the error is "111: Connection
> > refused") the first time I run it after booting if fluidsynth is not
> > already
> > running, no matter how long the timeout is; after Ctrl-C'ing out of the
> > program, all subsequent attempts succeed. Note that fluidsynth need not
> > be
> > running for a success to occur.
>
> Always the same exception? In both lines?

Yes; I'm sure this is obvious, but just for clarity: if fluidsynth is not 
running I expect that error at the first line where connection is attempted, 
and at the second line during the loop while fluidsynth is loading (this 
takes 0.5-5 seconds depending on the size of the soundfont it's using). But I 
don't understand why the connection is still refused once fluidsynth has 
finished loading.

I received an off-list reply to this post to the effect that attempting to 
reuse a socket on which a connection attempt has failed, will fail, and that 
I needed to create a new socket for each attempt. It seemed very plausible, 
so I tried inserting a fresh

fluid = socket(AF_INET, SOCK_STREAM)

before the second fluid.connect() in the loop; but this still behaved the same 
way. Is that the way to do it?

Annoyingly, I've so far only been able reproduce the problem by rebooting.

Regards,

John


From r.warhekar at gmail.com  Tue Feb 10 00:24:13 2009
From: r.warhekar at gmail.com (Rahul)
Date: Mon, 9 Feb 2009 21:24:13 -0800 (PST)
Subject: adodb has no attribute connect
References: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
	<6vbufnFj957sU1@mid.uni-berlin.de>
Message-ID: <acea82a2-8484-49fb-a9df-f0db1387cfc6@40g2000prx.googlegroups.com>

On Feb 10, 5:01?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Rahul schrieb:
>
> > Hello all,
>
> > I have to access data from database usingadodbso I did
>
> > Importadodb
> > Conn=adodb.NewADOConnection("odbc")
>
> > Upto this it works properly but when I say
>
> It does not. It returns None, thus the following error you see.
>
> > Conn.Connect("","","")
>
> > It gives error as
>
> > [Attributrerror]: Object Nonetype has no attribute Connect.
>
> > I have Red Hat Enterprise Linux 4
> > Python 2.5
> > Mod_python 3.3.1
>
> According to the docs on the (very old and seemingly not actively
> developedadodb-site), "odbc" needs the Python windows extensions. As
> you are on redheat, I have difficulties believing you make these work.
>
> Maybe mxodbc works? Or even better, ditch that ado-stuff and connect
> directly to your database. Python's DB-API is better I guess, no need
> for this attempt at mimicking windows APIs.
>
> Diez

Thank you Diez

I think this is very useful for me to change my mind and get shifted
to DB-API.

I will try to work on it.

Rahul


From michele.simionato at gmail.com  Tue Feb 10 00:26:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 9 Feb 2009 21:26:20 -0800 (PST)
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com> 
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com> 
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com> 
	<mailman.9200.1234236604.3487.python-list@python.org>
Message-ID: <2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>

On Feb 10, 4:29?am, "Gabriel Genellina"
> AFAIK, all facts appearing in said article are still true (except for 3.x ?
> which uses a shorter form). If super usage had been clearly documented in ?
> the first place, this had not happened.
> Perhaps you could point us to some resource explaining how is super ?
> supposed to be used correctly?
> And of those giving explanations in python-dev, nobody cared to add a ?
> single word to the Python documentation for years.
>
> > Honestly, I don't understand how this thing got so much out of
> > control. If anyone starts an intelligent question or remark about
> > super, this essay is thrown in no matter what. Anyone can explain why?
>
> Because for a very loooooong time (seven years, 2001-2008) super was ?
> almost undocumented. The Library Reference -before release 2.6- only had a ?
> short paragraph, the online documentation referred (and still does) to the ?
> original essay by Guido introducing descriptors, which is inaccurate and ?
> outdated, and then the "... harmful" article was the only source of ?
> information available.

All right. This is way I made the effort of writing a comprehensive
collection of all the tricky points about super
I knew:

http://www.artima.com/weblogs/viewpost.jsp?thread=236275
http://www.artima.com/weblogs/viewpost.jsp?thread=236278
http://www.artima.com/weblogs/viewpost.jsp?thread=237121

Also see this thread on python-dev about the issue of super
documentation: http://www.gossamer-threads.com/lists/python/dev/673833


                 Michele Simionato


From research at johnohagan.com  Tue Feb 10 00:28:26 2009
From: research at johnohagan.com (John O'Hagan)
Date: Tue, 10 Feb 2009 05:28:26 +0000
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <200902100528.27070.research@johnohagan.com>

On Mon, 9 Feb 2009, Aaron Brady wrote:
> Hello,
>
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started. 
[...]

I would love to see a simple code example of this if you have one; I've been 
wanting to do this but couldn't even get started.

Regards,

John


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 01:04:16 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 06:04:16 GMT
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:

> On Mon, 9 Feb 2009, Aaron Brady wrote:
>> Hello,
>>
>> I am writing a generator to return a sequence of numbers with some
>> variation.  The parameters of the variation can be changed by the
>> caller, even after the generator is started.
> [...]
> 
> I would love to see a simple code example of this if you have one; I've
> been wanting to do this but couldn't even get started.


Is this too simple?


>>> def gen(n):
...     while True:
...             obj = yield n
...             if obj is not None: n = obj
...
>>> g = gen(5)
>>> g.next()
5
>>> g.next()
5
>>> g.send(12)
12
>>> g.next()
12




-- 
Steven


From xie.kenneth at gmail.com  Tue Feb 10 01:11:31 2009
From: xie.kenneth at gmail.com (Ken)
Date: Tue, 10 Feb 2009 14:11:31 +0800
Subject: select error 10093 on winxp
Message-ID: <8af39e160902092211r7aa5a156s5a22d12cf0179e8e@mail.gmail.com>

I was testing select on windows xp with python 2.6.1, the code is simple:

import sys
import select

def testSelect():
    r = select.select([sys.stdin], [], [], 5.0)
    print r

if __name__ == "__main__":
    try:
        testSelect()
    except select.error, e:
        print e

While an error raised like this:

(10093, '\xd3\xa6\xd3\xc3\xb3\xcc\xd0\xf2\xc3\xbb\xd3\xd0\xb5\xf7\xd3\xc3
WSAStartup\xa3\xac\xbb\xf2\xd5\xdf WSAStartup')

What is this about?

Thanks in adv.
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From lepto.python at gmail.com  Tue Feb 10 01:28:15 2009
From: lepto.python at gmail.com (oyster)
Date: Tue, 10 Feb 2009 14:28:15 +0800
Subject: can multi-core improve single funciton?
Message-ID: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>

I mean this
[code]
def fib(n):
    if n<=1:
        return 1
    return fib(n-1)+fib(n-2)

useCore(1)
timeit(fib(500)) #this show 20 seconds

useCore(2)
timeit(fib(500)) #this show 10 seconds
[/code]

Is it possible?

and more, can threads/multi-processors/clusters be used to improve fib?

thanx


From clp2 at rebertia.com  Tue Feb 10 01:43:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 22:43:50 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
Message-ID: <50697b2c0902092243r36b5f0d9lcb41fea1b94fe42b@mail.gmail.com>

On Mon, Feb 9, 2009 at 10:28 PM, oyster <lepto.python at gmail.com> wrote:
> I mean this
> [code]
> def fib(n):
>    if n<=1:
>        return 1
>    return fib(n-1)+fib(n-2)
>
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
>
> useCore(2)
> timeit(fib(500)) #this show 10 seconds
> [/code]
>
> Is it possible?
>
> and more, can threads/multi-processors/clusters be used to improve fib?

Considering the GIL, I highly doubt it so. Also, the algorithm is
fundamentally linear -- each result depends on previous results -- so
I don't think you can easily parallelize it (if at all). You'd
probably get greater speedup using memoization.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From greg at cosc.canterbury.ac.nz  Tue Feb 10 01:58:08 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Tue, 10 Feb 2009 19:58:08 +1300
Subject: 'Import sys' succeeds in C++ embedded code, but module is not
	fully visible
In-Reply-To: <965ac14d-3a1d-4a00-bc94-6d09f2490d67@v42g2000yqv.googlegroups.com>
References: <b11e6e8a-98a6-43d1-b311-652fedbe7498@h5g2000yqh.googlegroups.com>
	<fc076702-4df0-484b-8cfc-65afb860d541@h5g2000yqh.googlegroups.com>
	<f917408b-c5c6-4e56-aca2-ff4d0076b09e@a26g2000prf.googlegroups.com>
	<8ddcc387-cc11-4401-8c07-f0ee26983a58@a29g2000pra.googlegroups.com>
	<965ac14d-3a1d-4a00-bc94-6d09f2490d67@v42g2000yqv.googlegroups.com>
Message-ID: <49912580.1000002@cosc.canterbury.ac.nz>

Ben Sizer wrote:
> Yes, this seems to fix it, thanks. But why? Can some Python guru
> explain why these two dictionaries must be the same? (Or what steps we
> must take if we want them to be separate?)

What's happening is that the import statement is binding
the name 'sys' in the locals, not the globals. You don't
notice this in the top-level code, since both are in scope
there. But inside the function you can only see the top-level
globals plus the function's own locals.

> I had hoped to be able to clear out the locals dictionary
> while leaving useful functions intact in the globals dictionary, but
> it would appear that is not practical.

You can probably do that by using global statements in the
top-level code for the things you want to preserve, e.g.

    global sys
    import sys
    my_local_var = 42

    global f
    def f():
      print "This function is in globals and can see sys.path"
      print sys.path

    def g():
      print "This function is in locals and can't see sys.path"

Now clearing the locals will remove g and my_local_var
while leaving the rest in globals.

The only restriction is that anything you want to refer
to from a function will have to be in the globals. This
includes other functions -- i.e. f() won't be able to
call g() in the example above.

-- 
Greg


From mail at microcorp.co.za  Tue Feb 10 01:59:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 08:59:54 +0200
Subject: wxPython vs Glade?
References: <20090209132321.GA30754@greedo> <gmpbd0$g68$2@ger.gmane.org>
Message-ID: <002601c98b4d$2e0e46c0$0d00a8c0@hendrik>

"Steve Holden" <steve at holdenweb.com> wrote:

> There's something called PythonCard built on top of wxPython that's
> fairly newb-friendly, though it gets clunkier as your demands grow.
> 
> You might also want to look at Dabo, which is a much more comprehensive
> framework that also hides much of wxPython's complexity.
> 

There is also Boa Constructor, that is a RAD tool that I have been
quite impressed by, after having been forced to use it in anger.
It handles all the GUI stuff for you, and what is there, seems solid
and bug free.

- Hendrik




From gagsl-py2 at yahoo.com.ar  Tue Feb 10 02:00:49 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 05:00:49 -0200
Subject: select error 10093 on winxp
References: <8af39e160902092211r7aa5a156s5a22d12cf0179e8e@mail.gmail.com>
Message-ID: <op.uo4i3nlex6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 04:11:31 -0200, Ken <xie.kenneth at gmail.com> escribi?:

> I was testing select on windows xp with python 2.6.1, the code is simple:

See the note in the documentation of module select:
http://docs.python.org/library/select.html#select.select

"Note: File objects on Windows are not acceptable, but sockets are. On  
Windows, the underlying select function is provided by the WinSock  
library, and does not handle file descriptors that don't originate from  
WinSock."

-- 
Gabriel Genellina



From could.net at gmail.com  Tue Feb 10 02:13:24 2009
From: could.net at gmail.com (Frank Potter)
Date: Mon, 9 Feb 2009 23:13:24 -0800 (PST)
Subject: What's wrong with my python? I can't use string
Message-ID: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>

I have a xxx.py which has code as below:

import string

print dir(string)
print string.printable


when I run it, I got the strange error:

"<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
"<root>\n"
"<result>##result##</result>\n"
"<msg>##msg##</msg>\n"
"<pass_no>##pass_no##</pass_no>\n"
"<pot_num>##pot_num##</pot_num>\n"
"<pots_mashed>##pots_mashed##</pots_mashed>\n"
"<yb_used>##yb_used##</yb_used>\n"
"<right>##right##</right>\n"
"</root>\n"
['__builtins__', '__doc__', '__file__', '__name__', 'str']
Traceback (most recent call last):
  File "del2.py", line 4, in ?
    print string.printable
AttributeError: 'module' object has no attribute 'printable'

It seems that I did not import the right string module I want. Can
someone give me a clue, please?



From clp2 at rebertia.com  Tue Feb 10 02:20:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 23:20:35 -0800
Subject: What's wrong with my python? I can't use string
In-Reply-To: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
References: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902092320r3cc5beb8lfda96d030bef9ad1@mail.gmail.com>

On Mon, Feb 9, 2009 at 11:13 PM, Frank Potter <could.net at gmail.com> wrote:
> I have a xxx.py which has code as below:
>
> import string
>
> print dir(string)
> print string.printable
>
>
> when I run it, I got the strange error:
>
> "<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
> "<root>\n"
> "<result>##result##</result>\n"
> "<msg>##msg##</msg>\n"
> "<pass_no>##pass_no##</pass_no>\n"
> "<pot_num>##pot_num##</pot_num>\n"
> "<pots_mashed>##pots_mashed##</pots_mashed>\n"
> "<yb_used>##yb_used##</yb_used>\n"
> "<right>##right##</right>\n"
> "</root>\n"
> ['__builtins__', '__doc__', '__file__', '__name__', 'str']
> Traceback (most recent call last):
>  File "del2.py", line 4, in ?
>    print string.printable
> AttributeError: 'module' object has no attribute 'printable'
>
> It seems that I did not import the right string module I want. Can
> someone give me a clue, please?

Sounds like the wrong `string` module is being imported. What's the
output of `print string.__file__`?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Tue Feb 10 02:22:20 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 09:22:20 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <015101c98b57$8bbe7420$0d00a8c0@hendrik>

"rantingrick" <ra..k.. at gmail.com> wrote

8< ----------------- dreams, goals and tentative spec -----------------

Have you looked at Pycad ? - it started off with a similar rush
some time ago.

Maybe there is something there that you can use and/or salvage.

- Hendrik




From could.net at gmail.com  Tue Feb 10 02:26:52 2009
From: could.net at gmail.com (Frank Potter)
Date: Mon, 9 Feb 2009 23:26:52 -0800 (PST)
Subject: What's wrong with my python? I can't use string
References: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
	<mailman.9208.1234250440.3487.python-list@python.org>
Message-ID: <e286ae82-7765-4083-a0ff-6332223bb6a5@t39g2000prh.googlegroups.com>

On Feb 10, 3:20?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 9, 2009 at 11:13 PM, Frank Potter <could.... at gmail.com> wrote:
> > I have a xxx.py which has code as below:
>
> > import string
>
> > print dir(string)
> > print string.printable
>
> > when I run it, I got the strange error:
>
> > "<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
> > "<root>\n"
> > "<result>##result##</result>\n"
> > "<msg>##msg##</msg>\n"
> > "<pass_no>##pass_no##</pass_no>\n"
> > "<pot_num>##pot_num##</pot_num>\n"
> > "<pots_mashed>##pots_mashed##</pots_mashed>\n"
> > "<yb_used>##yb_used##</yb_used>\n"
> > "<right>##right##</right>\n"
> > "</root>\n"
> > ['__builtins__', '__doc__', '__file__', '__name__', 'str']
> > Traceback (most recent call last):
> > ?File "del2.py", line 4, in ?
> > ? ?print string.printable
> > AttributeError: 'module' object has no attribute 'printable'
>
> > It seems that I did not import the right string module I want. Can
> > someone give me a clue, please?
>
> Sounds like the wrong `string` module is being imported. What's the
> output of `print string.__file__`?
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

Thank you so much ~
I got it.
I have a string.py in the same directory:(
and when I output string.__file__ as you told me, I know it.



From timr at probo.com  Tue Feb 10 02:34:02 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 10 Feb 2009 07:34:02 GMT
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
Message-ID: <38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>

Carl Banks <pavlovevidence at gmail.com> wrote:
>
>I'm pretty sure 2.6.1 is compiled with 8.0.  However, I think the
>Visual C++ 8.0 uses msvcrt90.dll.

No, the two digits of the DLL match the version number of C++.  The
confusion arises because the product is called "Visual Studio 2008", but it
includes Visual C++ 9.0, and hence msvcrt90.dll.  People say "VC8" when
they really mean Visual Studio 2008.

  Visual Studio 98    -  VC++ 6.0
  Visual Studio 2002  -  VC++ 7.0
  Visual Studio 2003  -  VC++ 7.1
  Visual Studio 2005  -  VC++ 8.0
  Visual Studio 2008  -  VC++ 9.0
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 02:34:54 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 07:34:54 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:

> I mean this
> [code]
> def fib(n):
>     if n<=1:
>         return 1
>     return fib(n-1)+fib(n-2)
> 
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
> 
> useCore(2)
> timeit(fib(500)) #this show 10 seconds [/code]
> 
> Is it possible?

What does useCore(n) mean?


> and more, can threads/multi-processors/clusters be used to improve fib?

No. The best way to improve fib is to improve fib, not to try running it 
on faster hardware.

Your algorithm makes *many* recursive calls to fib() for each call:

fib(1) => 1 function call
fib(2) => 3 function calls
fib(3) => 5 function calls
fib(4) => 9 function calls
fib(5) => 15 function calls
fib(6) => 25 function calls
fib(7) => 41 function calls
fib(8) => 67 function calls
fib(9) => 109 function calls
...
fib(34) => 18454929 function calls
fib(35) => 29860703 function calls
fib(36) => 48315633 function calls
...
fib(498) => 1.723e+104 function calls
fib(499) => 2.788e+104 function calls
fib(500) => 4.511e+104 function calls

Calling fib(500) the way you do will make more than 450 thousand billion 
billion billion billion billion billion billion billion billion billion 
billion function calls. You claim that you calculated it in just 20 
seconds. On my PC, it takes over a minute to calculate fib(38). I 
estimate it would take over five hours to calculate fib(50), and fib(100) 
would probably take 16 million years. I call shenanigans.



-- 
Steven


From nick.feinberg at gmail.com  Tue Feb 10 02:36:36 2009
From: nick.feinberg at gmail.com (Nicholas Feinberg)
Date: Mon, 9 Feb 2009 23:36:36 -0800
Subject: Problem with Tkinter's scale function.
Message-ID: <97c1d5380902092336x2289dfcyebf38ba933a53b81@mail.gmail.com>

Not the widget, the function in Canvas. So far as I can tell, integer values
for scale work fine; you can scale something to a factor of 2, 3, 17, etc.
Float values for scale - such as you might use if you were, say, trying to
scale a rectangle to half its current size - also work, insofar as the
targets of the scale-function are resized. The problem is that, in addition
to this resizing, they're sent hurtling off the canvas with remarkable
speed; rightwards if there's a float for the x-scale, downwards if there's a
float for the y-scale, bottom-rightwards if both are floats. It's
entertaining, but rather unhelpful.

Code that caused the problem (unlikely to be helpful, but no reason not to
include it):
self.canvas.scale(self.body,self.radius/(self.radius-.5),self.radius/(self.radius-.05),0,0)#radius
is greater than .5

Running Python 2.6 on Vista.
-------------- next part --------------
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From timr at probo.com  Tue Feb 10 02:37:12 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 10 Feb 2009 07:37:12 GMT
Subject: AJAX Post requests
References: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>
Message-ID: <7ib2p4lrhmlhr4gr0ifmvgdi24sp2dm309@4ax.com>

PJ <pauljefferson at gmail.com> wrote:
>
>I have a simple web server using  BaseHTTPServer, and the def do_POST
>(self) function works fine for regular forms that are submitted to it,
>but when I send an AJAX POST to it it does nothing (I've tried to just
>get it to print to check it's nothing else but it doesn't even do
>that, although it does for a regular POST request.

Are you absolutely sure your AJAX request is being sent with Content-Type
multipart/form-data?  Your code would explode silently if it didn't,
because "query" would not exist when you got to "print(query.get('data'))",
and your blanket "except" would hide the error.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ptmcg at austin.rr.com  Tue Feb 10 02:38:01 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 9 Feb 2009 23:38:01 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com> 
	<mailman.9205.1234248235.3487.python-list@python.org>
Message-ID: <d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>

On Feb 10, 12:43?am, Chris Rebert <c... at rebertia.com> wrote:
> Considering the GIL, I highly doubt it so. Also, the algorithm is
> fundamentally linear -- each result depends on previous results -- so
> I don't think you can easily parallelize it (if at all). You'd
> probably get greater speedup using memoization.
>
Even worse than linear, the function is recursive, which as I
understand it, is inherently a no-no when looking for code that is
parallel-friendly.

If you want multi-core to have some benefit, then your program must
have a way for separate parts of the problem to be processed
independently.  Many matrix processing problems fall into this camp,
since the various cells of the matrix can be worked on separately from
all others.  Prime number searchers break up a problem by having
separate processes scan different number ranges independently, or have
multiple processes perform rough pass prime filters, who write
possible primes to another queue to be more exhaustively checked.
This saves the expensive/exhaustive check from being done on every
number.  Fractal graphics generators (Mandelbrot set plots) can break
up the graphics range among different processors, or keep a "queue" of
pixels to generate, and each calculator process pulls from the queue
until all pixels are computed (some pixels take longer to compute than
others).

-- Paul




From http  Tue Feb 10 02:48:44 2009
From: http (Paul Rubin)
Date: 09 Feb 2009 23:48:44 -0800
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
Message-ID: <7xwsby7mw3.fsf@ruckus.brouhaha.com>

In case anyone is interested: Gideon Smeding of the University of
Utrecht has written a masters' thesis titled "An executable
operational semantics for Python".  It is actually a formal semantics
for a Python subset called minpy.  Per the blurb, the semantics are
described in literate Haskell that is compiled to an interpreter as
well as a formal specification.  Somehow there has to be a a reference
about "unless you're Dutch" to be made about this ;-).

Further info is at:
http://gideon.smdng.nl/2009/01/an-executable-operational-semantics-for-python/

I found this link via the Haskell Weekly News, http://sequence.complete.org .


From mail at microcorp.co.za  Tue Feb 10 02:48:53 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 09:48:53 +0200
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com><1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
Message-ID: <015201c98b57$8c4c5c40$0d00a8c0@hendrik>

"cptn.spoon" <cpt..n.... at gmail.com> wrote:
On Feb 9, 6:48 pm, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:

>> No.
>> At this level, just use a list of instances of your Stock class.
>>
>> - Hendrik
>
>How do I get a list of instances of a particular class? Is there a way
>to do this dynamically?

Yes there is. First make an empty list:

stock_market = []

Now when you create the instance:

stuff = GetStuffFromTheUserIfNecessary()
stock_market.append(Stock(stuff))

This leaves the new instance in the last position in the list.

When you have done that as many times as you wanted, 
to create the stocks in the market, you can do:

for stock in stock_market:
    DoThingsWithThisOneStock(stock)

>
>Also, what would be the way of dynamically creating an instance of a
>class based on user input (ie a user wants to create a new instance of
>the Stock class via shell input)?

This means your program must be looking for that input.
Either look at thread and threading, or write a simple
loop that gets input, appends a stock, gets more input
if required, does something with all the stocks, and
either loops or terminates. Or some variation of that
like first building the market and then manipulating it.

>
>I'm not sure if I have the wrong mindset here.
>

I honestly cannot tell if your mindset is right or
wrong - I suppose it depends on your definitions
of the two terms.
:-)
- Hendrik




From mail at microcorp.co.za  Tue Feb 10 03:07:56 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 10:07:56 +0200
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com><slrngooe42.c1v.grahn+nntp@frailea.sa.invalid><557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com><mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
Message-ID: <015301c98b57$8cec93e0$0d00a8c0@hendrik>

"Spacebar265" <spac.. at gmail.com> wrote:

>Thanks. How would I do separate lines into words without scanning one
>character at a time?

Type the following at the interactive prompt and see what happens:

s = "This is a string composed of a few words and a newline\n"
help(s.split)
help(s.rstrip)
help(s.strip)
dir(s)

- Hendrik




From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 03:12:30 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 08:12:30 GMT
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
	<01a1281b$0$7503$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 18:52:40 +1100, Joel Ross wrote:

> Thanks for the quick response guys. Help me out a alot. I'm a newbie to
> python and your replies help me understand a bit more about python!!

Joel, unless you have Guido's time machine and are actually posting from 
the future, the clock, or possibly the time zone, on your PC is set 
wrong. 


-- 
Steven





From gweis at gmx.at  Tue Feb 10 03:18:23 2009
From: gweis at gmx.at (Gerhard Weis)
Date: Tue, 10 Feb 2009 18:18:23 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a12e1d$0$30497$c3e8da3@news.astraweb.com>

Once I have seen Haskell code, that ran fibonacci on a 4 core system.

The algorithm itself basically used an extra granularity paramet until 
which new threads will be sparked. e.g. fib(40, 36) means, calculate 
fib(40) and spark threads until n=36.
1. divide: fib(n-1), fib(n-2)
2. divide: fib(n-2), fib(n-3)
3. divide: fib(n-3), fib(n-4)

We tried this code on a 4 core machine using only 1 core and all 4 cores.
1 core wallclock: ~10s
4 core wallclock: ~3s

So there is a signifcant speedup, but I guess, this only works with 
Haskell out of the box.
I have not tried it, but I think you can simulate Haskell's behaviour, 
by caching the results of fib(n).
(We tried the same algorithm in Java. While it utilized all 4 cores, 
there was no speedup. This is why I think, that result caching is the 
only way to speedup fibonacci.

cheers

Gerhard


On 2009-02-10 17:34:54 +1000, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:
> 
>> I mean this
>> [code]
>> def fib(n):
>> if n<=1:
>> return 1
>> return fib(n-1)+fib(n-2)
>> 
>> useCore(1)
>> timeit(fib(500)) #this show 20 seconds
>> 
>> useCore(2)
>> timeit(fib(500)) #this show 10 seconds [/code]
>> 
>> Is it possible?
> 
> What does useCore(n) mean?
> 
> 
>> and more, can threads/multi-processors/clusters be used to improve fib?
> 
> No. The best way to improve fib is to improve fib, not to try running it
> on faster hardware.
> 
> Your algorithm makes *many* recursive calls to fib() for each call:
> 
> fib(1) => 1 function call
> fib(2) => 3 function calls
> fib(3) => 5 function calls
> fib(4) => 9 function calls
> fib(5) => 15 function calls
> fib(6) => 25 function calls
> fib(7) => 41 function calls
> fib(8) => 67 function calls
> fib(9) => 109 function calls
> ...
> fib(34) => 18454929 function calls
> fib(35) => 29860703 function calls
> fib(36) => 48315633 function calls
> ...
> fib(498) => 1.723e+104 function calls
> fib(499) => 2.788e+104 function calls
> fib(500) => 4.511e+104 function calls
> 
> Calling fib(500) the way you do will make more than 450 thousand billion
> billion billion billion billion billion billion billion billion billion
> billion function calls. You claim that you calculated it in just 20
> seconds. On my PC, it takes over a minute to calculate fib(38). I
> estimate it would take over five hours to calculate fib(50), and fib(100)
> would probably take 16 million years. I call shenanigans.




From gagsl-py2 at yahoo.com.ar  Tue Feb 10 03:19:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 06:19:18 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<mailman.9200.1234236604.3487.python-list@python.org>
	<2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>
Message-ID: <op.uo4mqgmox6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 03:26:20 -0200, Michele Simionato  
<michele.simionato at gmail.com> escribi?:
> On Feb 10, 4:29?am, "Gabriel Genellina"

>> > Honestly, I don't understand how this thing got so much out of
>> > control. If anyone starts an intelligent question or remark about
>> > super, this essay is thrown in no matter what. Anyone can explain why?
>>
>> Because for a very loooooong time (seven years, 2001-2008) super was ?
>> almost undocumented. The Library Reference -before release 2.6- only  
>> had a ?
>> short paragraph, the online documentation referred (and still does) to  
>> the ?
>> original essay by Guido introducing descriptors, which is inaccurate  
>> and ?
>> outdated, and then the "... harmful" article was the only source of ?
>> information available.
>
> All right. This is way I made the effort of writing a comprehensive
> collection of all the tricky points about super
> I knew:
>
> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
> http://www.artima.com/weblogs/viewpost.jsp?thread=236278
> http://www.artima.com/weblogs/viewpost.jsp?thread=237121

You really should push them to be included in python.org, even in their  
unfinished form. (At least a link in the wiki pages). Their visibility is  
almost null now.
They're very clearly written - I wish you had published them years ago!

> Also see this thread on python-dev about the issue of super
> documentation: http://www.gossamer-threads.com/lists/python/dev/673833

Apart from a few remarks in the first posts, there is little criticism of  
your articles themselves. Looks like adding a section about Python 3 is  
the only important pending issue - again, you really should publish the  
series in a more prominent place.

-- 
Gabriel Genellina



From jef.mangelschots at gmail.com  Tue Feb 10 03:40:15 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Tue, 10 Feb 2009 00:40:15 -0800 (PST)
Subject: import wx works interactive but not from script
Message-ID: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>

when I call "import wx" from the interactive console, it works (i.e.
it doesn't complain).
But when I call the same from a script, it complains that it can not
find the wx module.

------------works for interactive----------------------------
Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
>>>

------------does not work frm script--------------------------
Traceback (most recent call last):
  File "c:\temp\myscript.py", line 4, in <module>
    import wx
ImportError: No module named wx


I run Vista Home premium 64bit. Python 2.6.1 (the 32-bit version).
I installed the latest 32-bit ANSI version of wxpython. (http://
downloads.sourceforge.net/wxpython/wxPython2.8-win32-ansi-2.8.9.1-
py26.exe)
In the folder C:\Python26\Lib\site-packages, I find a wx.pth file with
a single line in there: "wx-2.8-msw-ansi"
in that same directory is a folder named "wx-2.8-msw-ansi" and it
contains a subdirectory called "wx" with what appears to be the
regular wx libary stuff, including __init__.py
My PATH starts with C:\Python26;C:\Python26\Scripts;C:\Python26\lib;

any idea's ?








From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 03:45:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 08:45:37 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:

> Once I have seen Haskell code, that ran fibonacci on a 4 core system.
> 
> The algorithm itself basically used an extra granularity paramet until
> which new threads will be sparked. e.g. fib(40, 36) means, calculate
> fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
> 2. divide: fib(n-2), fib(n-3)
> 3. divide: fib(n-3), fib(n-4)
> 
> We tried this code on a 4 core machine using only 1 core and all 4
> cores. 1 core wallclock: ~10s
> 4 core wallclock: ~3s

Three seconds to calculate fib(40) is terrible. Well, it's a great saving 
over ten seconds, but it's still horribly, horribly slow.

Check this out, on a two-core 2.2 GHz system:


>>> import timeit
>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
7.2956085205078125e-05

That's five orders of magnitude faster. How did I do it? I used a better 
algorithm.


def fib(n, a=1, b=1):
    if n==0:
        return a
    elif n==1:
        return b
    return fib(n-1, b, a+b)


And for the record:

>>> fib(500)
225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
0.00083398818969726562

Less than a millisecond, versus millions of years for the OP's algorithm. 
I know which I would choose. Faster hardware can only go so far in hiding 
the effect of poor algorithms.



-- 
Steven


From mail at microcorp.co.za  Tue Feb 10 03:47:32 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 10:47:32 +0200
Subject: Problem with Tkinter's scale function.
References: <97c1d5380902092336x2289dfcyebf38ba933a53b81@mail.gmail.com>
Message-ID: <01a301c98b5d$0708b3c0$0d00a8c0@hendrik>


Nicholas Feinberg wrote:


>Code that caused the problem (unlikely to be helpful, but no reason not to
include it):
>self.canvas.scale(self.body,self.radius/(self.radius-.5),self.radius/(self.radi
us-.05),0,0)#radius is greater than .5

scale's arguments are:

scale(TagOrID,xorigen,yorigen,xscale,yscale)

You seem to be moving the thing and scaling it to zero...

- Hendrik



From mail at timgolden.me.uk  Tue Feb 10 04:10:18 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 09:10:18 +0000
Subject: import wx works interactive but not from script
In-Reply-To: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
Message-ID: <4991447A.9030801@timgolden.me.uk>

jefm wrote:
> when I call "import wx" from the interactive console, it works (i.e.
> it doesn't complain).
> But when I call the same from a script, it complains that it can not
> find the wx module.
> 
> ------------works for interactive----------------------------
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import wx
>>>>
> 
> ------------does not work frm script--------------------------
> Traceback (most recent call last):
>   File "c:\temp\myscript.py", line 4, in <module>
>     import wx
> ImportError: No module named wx


Do you have only the one version of Python on this
machine? Did you upgrade from, eg, Python2.5? And
are you running this script by, eg, double-clicking
on it / running it from the command prompt with the
script name alone? If so, check that ftype python.file
shows that .py files are associated with the version
of Python you expect.

TJG


From phillip.oldham at gmail.com  Tue Feb 10 04:26:46 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Tue, 10 Feb 2009 01:26:46 -0800 (PST)
Subject: Convert date/time to unix timestamp?
Message-ID: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>

Is there a simple way to set a date/time and convert it to a unix
timestamp? After some googling I found the following:

t = datetime.time(7,0,0)
starttime = time.mktime(t.timetuple())+1e-6*t.microsecond

That seems like very long-winded. Is there an easier way? I've read
the docs on the datetime and time modules, but nothing's jumping out
at me.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 04:32:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 07:32:35 -0200
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo4p4lk7x6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 06:45:37 -0200, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> escribi?:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
>
>> We tried this code on a 4 core machine using only 1 core and all 4
>> cores. 1 core wallclock: ~10s
>> 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
>
>>>> import timeit
>>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
>
> def fib(n, a=1, b=1):
>     if n==0:
>         return a
>     elif n==1:
>         return b
>     return fib(n-1, b, a+b)

I agree with your comment, but this is not the right way to write it in  
Python. This style is fine in a language with tail-call optimization --  
but fib(1000) raises `RuntimeError: maximum recursion depth exceeded`

The same thing after removing recursion can compute the 2089 digits of  
fib(10000) without problems:

def fib(n):
     a = b = 1
     while n:
       n, a, b = n-1, b, a+b
     return a

> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

Completely agree!

-- 
Gabriel Genellina



From bj_666 at gmx.net  Tue Feb 10 04:42:57 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 10 Feb 2009 09:42:57 GMT
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
Message-ID: <6vd0h1Fjele5U1@mid.uni-berlin.de>

On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:

> Jean-Paul Calderone <exarkun <at> divmod.com> writes:
>> Consider whether you really need to use super().
>> 
>> http://fuhm.net/super-harmful/
> 
> This article chiefly deals with super()'s harm in multiple inteheritance
> situations. For the simple case, though, like that presented by the OP,
> I believe super() is perfect.

But for the simple cases it is unnecessary because it was invented to 
deal with multiple inheritance problems.

Ciao,
	Marc 'BlackJack' Rintsch


From clp2 at rebertia.com  Tue Feb 10 04:43:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 01:43:20 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0902100143s3289ca44g2a9a84f3192f6aa@mail.gmail.com>

On Tue, Feb 10, 2009 at 12:45 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
>
>> Once I have seen Haskell code, that ran fibonacci on a 4 core system.
>>
>> The algorithm itself basically used an extra granularity paramet until
>> which new threads will be sparked. e.g. fib(40, 36) means, calculate
>> fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
>> 2. divide: fib(n-2), fib(n-3)
>> 3. divide: fib(n-3), fib(n-4)
>>
>> We tried this code on a 4 core machine using only 1 core and all 4
>> cores. 1 core wallclock: ~10s
>> 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
>
>>>> import timeit
>>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
>
> def fib(n, a=1, b=1):
>    if n==0:
>        return a
>    elif n==1:
>        return b
>    return fib(n-1, b, a+b)
>
>
> And for the record:
>
>>>> fib(500)
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
>>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
> 0.00083398818969726562
>
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

Indeed. And apparently memoization can hide it also:

$ #memoization added to OP's code
$ python -m timeit -s 'from memoized_naive_recursive_version import
fib' 'fib(40)'
1000000 loops, best of 3: 0.639 usec per loop
$ #your code
$ python -m timeit -s 'from your_version import fib' 'fib(40)'
100000 loops, best of 3: 15.4 usec per loop
$ cat memoized_naive_recursive_version.py
def memoize(func):
    cache = {}
    def memoized(*args):
        if args in cache:
            return cache[args]
        else:
            result = func(*args)
            cache[args] = result
            return result
    return memoized

@memoize
def fib(n):
    if n <= 1:
        return 1
    else:
        return fib(n-1) + fib(n-2)

However, the naive recursive version fails by exceeding the maximum
recursion depth if N is too large, whereas your version continues to
succeed for a much higher limit of N.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gh at ghaering.de  Tue Feb 10 04:47:17 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Tue, 10 Feb 2009 10:47:17 +0100
Subject: Which core am I running on?
In-Reply-To: <c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>	<mailman.9136.1234182305.3487.python-list@python.org>
	<c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>
Message-ID: <gmrif5$g7q$1@ger.gmane.org>

psaffrey at googlemail.com wrote:
> On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
>> http://objectmix.com/python/631346-parallel-python.html
>>
> 
> Hmm. In fact, this doesn't seem to work for pp. When I run the code
> below, it says everything is running on the one core.
> 
> import pp
> import random
> import time
> from string import lowercase
> 
> ncpus = 3
> 
> def timedCharDump(waittime, char):
> 	time.sleep(waittime)
> 	mycore = open("/proc/%i/stat" % os.getpid()).read().split()[39]
> 	print "I'm doing stuff!", mycore, char
> 	return char
> 
> job_server = pp.Server(ncpus, ppservers=())
> 
> jobdetails = [ (random.random(), letter) for letter in lowercase ]
> 
> jobs = [ job_server.submit(timedCharDump,(jinput1, jinput2), (),
> ("os", "time",)) for jinput1, jinput2 in jobdetails ]
> 
> for job in jobs:
> 	print job()

Quick look again found this:

http://brokestream.com/procstat.html

I guess I counted wrong and it's actually column 38, not 39.

-- Gerhard



From joelc at cognyx.com  Tue Feb 10 05:03:06 2009
From: joelc at cognyx.com (Joel Ross)
Date: Tue, 10 Feb 2009 21:03:06 +1100
Subject: Variable + String Format
Message-ID: <019ff536$0$20657$c3e8da3@news.astraweb.com>

Hi all,

I have this piece of code:
#########################################################################

wordList = "/tmp/Wordlist"
file = open(wordList, 'r+b')


def readLines():

         for line in file.read():
             if not line: break
             print line + '.com '
             return line



readLines()
file.close()

##########################################################################

It returns the results:

t.com

NOTE: Only returns the first letter of the first word on the first line 
e.g. test would only print t and readline() does the same thing.

I have also tried readlines() which gives me the result:

test
.com

The file Wordlist has one word on each line for example

test
test1
test2

I need it to loop though the Wordlist file and print/return the results

test.com
test1.com
test2.com

I'm just looking for a point in the right direction.

Much Thanks

JOelC


From ringogarcia at gmail.com  Tue Feb 10 05:03:09 2009
From: ringogarcia at gmail.com (Nacho)
Date: Tue, 10 Feb 2009 02:03:09 -0800 (PST)
Subject: Setting DNS using win32com
Message-ID: <394007a3-d85b-4d6c-9825-a4db2add8df3@f20g2000yqg.googlegroups.com>

I am trying to make a small python application to change DNS servers
in a small LAN.

I am trying this code but I don't manage it to work, I only get the
values removed.

My code is this:

import win32com.client

objWMIService = win32com.client.GetObject("winmgmts:
{impersonationLevel=impersonate}!\\\\" + strComputer + "\\root\
\cimv2")
nicList = objWMIService.ExecQuery("SELECT * FROM
Win32_NetworkAdapterConfiguration WHERE IPEnabled = True")

for nic in nicList:
    nic.DNSServerSearchOrder = (u'1.2.3.4', u'2.3.4.5')
    nic.SetDNSServerSearchOrder

nic.SetDNSServerSearchOrder returns 0 so it is supposed to have been
done correctly, but no DNS Server is found in the Network Properties.

I don't know what I am doing wrong so any hint or any documentation
about this would be appreciated.

Thank you by now.



From niklas.norrthon at hotmail.com  Tue Feb 10 05:05:35 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Tue, 10 Feb 2009 02:05:35 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org> 
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com> 
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>

On 10 Feb, 09:45, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
> > Once I have seen Haskell code, that ran fibonacci on a 4 core system.
>
> > The algorithm itself basically used an extra granularity paramet until
> > which new threads will be sparked. e.g. fib(40, 36) means, calculate
> > fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
> > 2. divide: fib(n-2), fib(n-3)
> > 3. divide: fib(n-3), fib(n-4)
>
> > We tried this code on a 4 core machine using only 1 core and all 4
> > cores. 1 core wallclock: ~10s
> > 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
> >>> import timeit
> >>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
>
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
> def fib(n, a=1, b=1):
> ? ? if n==0:
> ? ? ? ? return a
> ? ? elif n==1:
> ? ? ? ? return b
> ? ? return fib(n-1, b, a+b)
>
> And for the record:
>
> >>> fib(500)
>
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L

According to the common definition of fibonacci numbers fib(0) = 0, fib
(1) = 1 and fib(n) = fib(n-1) + fib(n-2) for n > 1. So the number
above is fib(501).

>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
>
> 0.00083398818969726562

And now for my version (which admitedly isn't really mine, and returns
slightly incorrect fib(n) for large values of n, due to the limited
floating point precision).

>>> import math
>>> sqrt5 = math.sqrt(5)
>>> golden_section = (sqrt5 + 1) / 2
>>> def fib(n):
	return int(golden_section ** n / sqrt5 + 0.5)

>>> fib(501)
225591516161940121919323945317755919750165306733355143970858461525064153963081278412888159063487104942080L

>>> timeit.Timer('fib(501)', 'from __main__ import fib').timeit(1)
1.9555558083084179e-05

>
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.
>

I agree 100%

/Niklas Norrthon


From michele.simionato at gmail.com  Tue Feb 10 05:11:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 10 Feb 2009 02:11:10 -0800 (PST)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com> 
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
Message-ID: <34d373ad-52d2-4d38-94b7-d566a5a5dd58@s20g2000yqh.googlegroups.com>

On Feb 10, 10:42?am, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> >> Consider whether you really need to use super().
>
> >>http://fuhm.net/super-harmful/
>
> > This article chiefly deals with super()'s harm in multiple inteheritance
> > situations. For the simple case, though, like that presented by the OP,
> > I believe super() is perfect.
>
> But for the simple cases it is unnecessary because it was invented to
> deal with multiple inheritance problems.
>
> Ciao,
> ? ? ? ? Marc 'BlackJack' Rintsch

Unfortunately there is no good solution. If you have a single
inheritance hierarchy and you do
not use super, you make it impossible for users of your hierarchy to
subclass it by using multiple inheritance in a cooperative way (this
is not polite).
OTOH, if you user super, your users must know about it, to avoid
unexpected cooperation. It is all explained in the "super harmful"
paper, which is a must read even if you only use single inheritance.


From greg at cosc.canterbury.ac.nz  Tue Feb 10 05:57:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Tue, 10 Feb 2009 23:57:51 +1300
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <mailman.9130.1234171952.3487.python-list@python.org>
References: <6va201FijdteU1@mid.individual.net>
	<mailman.9130.1234171952.3487.python-list@python.org>
Message-ID: <49915DAF.9080901@cosc.canterbury.ac.nz>

Mark Hammond wrote:

> What problems specifically?  The only practical problems you should see 
> will arise if you try and pass a "FILE *", or allocate memory you then 
> ask python to free (or vice-versa) - both should be avoidable though...

It concerns a Ruby plugin for Sketchup that embeds a Python
interpreter and acts as a bridge between Ruby and Python.
I'm using Sketchup 7 which uses msvcrt80.dll, and includes
a Ruby dll which is presumably also linked against that
crt.

I've made some progress on the issue. One problem turned out to
be a result of allocating something with ruby_xmalloc() and
freeing it with free(), which was easy to fix.

Another one seemed to be something to do with trying to use
a global var that points to the current Ruby stack frame. I
don't really know what was happening, but I found another way
of doing things that sidestepped the issue.

I've now got it working, at first sight anyhow, using Python 2.3.

But it doesn't work properly with Python 2.5. The problem
appears to be related to compiling .py files to .pyc. The
first time I run it and try to import a module, a .pyc is
generated, but then a crash occurs when trying to call one
of the functions imported from it. If I run it a second time,
with the previously generated .pyc in place, it runs successfully.

Which makes me think it may be some kind of FILE * problem,
but I'm not sure what, since all the stdio operations on
the files concerned should be getting done by Python.

To add insult to injury, it's proving to be very difficult
to debug, because Sketchup seems to crash all on its own
when run under gdb on Windows, even when I don't load any
of my code. So I can't get a traceback of where the crash
is occurring.

There's one possibility I just thought of -- Python may
be trying to write something to stdout or stderr, in which
case it will probably be using the wrong crt to do it.
Something to look into after I've got some sleep...

-- 
Greg


From crculver at christopherculver.com  Tue Feb 10 06:33:35 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 10 Feb 2009 13:33:35 +0200
Subject: Converting timestamps across timezones
Message-ID: <87tz72wmpc.fsf@christopherculver.com>

A script that I'm writing pulls the system time off of an iPod
connected to the computer. The iPod's time is represented as a Unix
timestamp (seconds since the epoch), but this timestamp does not
represent UTC time, but rather the local timezone of the owner. I need
to convert this local time timestamp into a UTC timestamp by referring
to the timezone specified by /etc/localtime on the computer.

I've read through the docs, but I'm rather lost on how to pull this
particular operation off. Any advice would be appreciated.


From duncan.booth at invalid.invalid  Tue Feb 10 07:06:06 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Feb 2009 12:06:06 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9BAE798A293F9duncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
> 
>> How would I do separate lines into words without scanning one character
>> at a time?
> 
> Scan a line at a time, then split each line into words.
> 
> 
> for line in open('myfile.txt'):
>     words = line.split()
> 
> 
> should work for a particularly simple-minded idea of words.
> 
Or for a slightly less simple minded splitting you could try re.split:

>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']


-- 
Duncan Booth http://kupuguy.blogspot.com


From pauljefferson at gmail.com  Tue Feb 10 07:27:51 2009
From: pauljefferson at gmail.com (Paul)
Date: Tue, 10 Feb 2009 04:27:51 -0800 (PST)
Subject: AJAX Post requests
References: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>
	<7ib2p4lrhmlhr4gr0ifmvgdi24sp2dm309@4ax.com>
Message-ID: <c67844ce-f53e-488e-b21b-20686a423ce3@v42g2000yqj.googlegroups.com>

On Feb 10, 7:37?am, Tim Roberts <t... at probo.com> wrote:
> PJ <pauljeffer... at gmail.com> wrote:
>
> >I have a simple web server using ?BaseHTTPServer, and the def do_POST
> >(self) function works fine for regular forms that are submitted to it,
> >but when I send anAJAXPOST to it it does nothing (I've tried to just
> >get it to print to check it's nothing else but it doesn't even do
> >that, although it does for a regular POST request.
>
> Are you absolutely sure yourAJAXrequest is being sent with Content-Type
> multipart/form-data? ?Your code would explode silently if it didn't,
> because "query" would not exist when you got to "print(query.get('data'))",
> and your blanket "except" would hide the error.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

Thankyou for that - you're right - I'm new to AJAX so it's taking me a
bit of time to get used to it - its an application data type being
submitted


From bearophileHUGS at lycos.com  Tue Feb 10 07:29:07 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 10 Feb 2009 04:29:07 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
	<7xwsby7mw3.fsf@ruckus.brouhaha.com>
Message-ID: <1732ba01-6096-4d38-a09d-fe1fbe75b435@l1g2000yqj.googlegroups.com>

Paul Rubin:
> Gideon Smeding of the University of
> Utrecht has written a masters' thesis titled "An executable
> operational semantics for Python".

A significant part of Computer Science is a waste of time and money.

Bye,
bearophile


From durumdara at gmail.com  Tue Feb 10 07:29:50 2009
From: durumdara at gmail.com (durumdara)
Date: Tue, 10 Feb 2009 13:29:50 +0100
Subject: STMP, mail, sender-from, to-bcc-addr
Message-ID: <4991733E.4040608@gmail.com>

Hi!

I wanna ask that have anyone some experience with email.msg and smtplib?

The email message and smtp.send already have "sender/from" and 
"recip/addr to".
Possible the smtp components does not uses the email tags if I not 
define them only in the message?

Can I do same thing as in GMAIL that the mail does not have TO, only BCC 
tags/recipients, and no one of the recipients who knows about the each 
others?

Thanks:
    dd



From andrew at acooke.org  Tue Feb 10 07:30:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 09:30:05 -0300 (CLST)
Subject: generator object or 'send' method?
In-Reply-To: <pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <996d9fdfe31fb995b8c616e90a6eff79.squirrel@acooke.dyndns.org>


steven probably knows this, but to flag the issue for people who are
looking at generators/coroutines for the first time: there's a little
"gotcha" about exactly how the two sides of the conversation are
synchronized.  in simple terms: send also receives.

unfortunately the example steven gave doesn't really show this, so i've
modified it below.  you can now see that the first next() after .send()
receives 2, not 1.  note that i am using python 3, so the .next() method
is .__next__() (the asymmetry between next and send seems odd to me, but
there you go).

(in a sense this is completely logical, but if you're used to the
asynchronous way the internet works, it can seem unintuitive)

how to handle this was one of the things the original post was asking
about (if i understood correctly).

>>> def gen(n):
...   while True:
...     obj = yield n
...     n += 1
...     if obj is not None: n = obj
...
>>> g = gen(5)
>>> next(g)
5
>>> g.__next__()
6
>>> g.send(1)
1
>>> next(g)
2

andrew


Steven D'Aprano wrote:
> On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:
>> I would love to see a simple code example of this if you have one; I've
>> been wanting to do this but couldn't even get started.
>
> Is this too simple?
>
>>>> def gen(n):
> ...     while True:
> ...             obj = yield n
> ...             if obj is not None: n = obj
> ...
>>>> g = gen(5)
>>>> g.next()
> 5
>>>> g.next()
> 5
>>>> g.send(12)
> 12
>>>> g.next()
> 12




From joelc at cognyx.com  Tue Feb 10 07:35:33 2009
From: joelc at cognyx.com (Joel Ross)
Date: Tue, 10 Feb 2009 23:35:33 +1100
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <01a16a69$0$7503$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code:
> #########################################################################
> 
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
> 
> 
> def readLines():
> 
>         for line in file.read():
>             if not line: break
>             print line + '.com '
>             return line
> 
> 
> 
> readLines()
> file.close()
> 
> ##########################################################################
> 
> It returns the results:
> 
> t.com
> 
> NOTE: Only returns the first letter of the first word on the first line 
> e.g. test would only print t and readline() does the same thing.
> 
> I have also tried readlines() which gives me the result:
> 
> test
> .com
> 
> The file Wordlist has one word on each line for example
> 
> test
> test1
> test2
> 
> I need it to loop though the Wordlist file and print/return the results
> 
> test.com
> test1.com
> test2.com
> 
> I'm just looking for a point in the right direction.
> 
> Much Thanks
> 
> JOelC


THAT'S BETTER!!! :)


From gerhard at proclos.com  Tue Feb 10 07:41:25 2009
From: gerhard at proclos.com (Gerhard Weis)
Date: Tue, 10 Feb 2009 22:41:25 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a16bc0$0$20660$c3e8da3@news.astraweb.com>

> def fib(n, a=1, b=1):
>     if n==0:
>         return a
>     elif n==1:
>         return b
>     return fib(n-1, b, a+b)
> 
> 
> And for the record:
> 
>>>> fib(500)
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
timeit.Timer('fib(500)', 
> 
>>>> 'from __main__ import fib').timeit(1)
> 0.00083398818969726562
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

I agree to 100% to this.

btw. the timeings are not that different for the naive recursion in 
OP's version and yours.
fib(500) on my machine:
	OP's: 0.00116 (far away from millions of years)
	This here: 0.000583
	Gabriel's while loop: 0.000246

The fastest algorithm I've found does fib(1000000) in .25seconds on my machine.
However, I have not found a way to parallelize this algorithm and I 
think it is not possible.

To come back to the original question. Yes it is possible; however 
there are quite some restrictions about it. In case of the naive 
recursion it was possible to get a speedup of more than 3 times on a 4 
core machine. With the highly optimised version mentioned above, I had 
no success in utilizing more than one core.

As conclusion I would say, Yes, a single function can profit from 
multiple cores, but sometimes a better algorithm delivers better 
results than using more cores. However, it is possible that a slower 
but parallelizable algorithm might outperform the best serial 
algorithm, with enough cores :).

Gerhard



From thomas.kraus at merz-akademie.de  Tue Feb 10 07:42:17 2009
From: thomas.kraus at merz-akademie.de (Thomas Kraus)
Date: Tue, 10 Feb 2009 13:42:17 +0100
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <gmrsrp$vvr$1@news01.versatel.de>

Phillip B Oldham schrieb:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
> 
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
> 
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.

The built-in function time.localtime() returns a 9-item tuple, e.g. 
(2009, 2, 10, 13, 29, 7, 1, 41, 0).

time.mktime() converts this tuple to the seconds since the Epoch as a 
floating point number, int() converts it to an integer.

int(time.mktime(time.localtime()))

--
Thomas


From lie.1296 at gmail.com  Tue Feb 10 07:43:20 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 10 Feb 2009 12:43:20 +0000 (UTC)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
Message-ID: <gmrsp8$eb4$1@ger.gmane.org>

On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:

> I mean this
> [code]
> def fib(n):
>     if n<=1:
>         return 1
>     return fib(n-1)+fib(n-2)
> 
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
> 
> useCore(2)
> timeit(fib(500)) #this show 10 seconds [/code]
> 
> Is it possible?
> 
> and more, can threads/multi-processors/clusters be used to improve fib?
> 
> thanx

Of course multi-core processor can improve single function using 
multiprocessing, as long as the function is parallelizable. The Fibonacci 
function is not a parallelizable function though.

However, there are ways to improve your fibonacci function. Either put 
off the recursion or implement a memoization. An imperative fibonacci is 
much faster than a naive recursion one because a naive recursive 
fibonacci function is O(2**n) while the imperative one O(n). Memoization 
must be used to help recursive fibonacci to become O(n).



From andrew at acooke.org  Tue Feb 10 08:00:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 10:00:37 -0300 (CLST)
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <07563d777dbc68c9315b2c3d32d98e43.squirrel@localhost>


the python routines are a bit basic - you really have to think quite hard
about what you are doing to get the right answer.

in your case, you need to be clear what the timezone is for the datetime
you are using.  timezone info is optional (see the datetime documentation,
where it talks about "naive" and "aware" objects).

anyway, ignoring that, i think you need the very useful, but oddly
located, calendar.timegm().

andrew


Phillip B Oldham wrote:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
>
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
>
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From lie.1296 at gmail.com  Tue Feb 10 08:03:41 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 10 Feb 2009 13:03:41 +0000 (UTC)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
	<7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>
Message-ID: <gmrtvd$eb4$2@ger.gmane.org>

On Tue, 03 Feb 2009 20:08:34 -0800, Stephen Hansen wrote:

> There is no need to try to make sure something is
> executed/compiled only once in Python like you may want to do in C.
> Every module is only ever compiled once: if you import it ten times in
> ten different places only the first will compile and execute the code,
> the rest of the calls will return that original module again.

<nitpick>
If you import a module, it will be recompiled only if the module changes 
from the precompiled .pyc/.pyo. OTOH, if you run a module, it will be 
recompiled every time even if there is no change.
</nitpick>



From jldunn2000 at googlemail.com  Tue Feb 10 08:06:18 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 05:06:18 -0800 (PST)
Subject: python ssh and Tetia SSH server
Message-ID: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>

Anyone out there any experience of using python ssh modules to connect
to the Tetia SSH server from SSH (ssh.com)?





From ferdinandsousa at gmail.com  Tue Feb 10 08:22:24 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 10 Feb 2009 18:52:24 +0530
Subject: COM and threading, "CoInitialize"?
Message-ID: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>

Greetings to list members,

I am trying to use an Acrobat COM object in a class that is subclassed from
threading.Thread.
Since threading.Thread is subclassed, the __init__ method of the inheriting
class must explicitly call the threading.Thread.__init__ method of the
parent. I guess I'm missing something similar for the COM object. Threading
code and traceback below. Any pointers?

CODE:
=================================
class process_file(threading.Thread):

    def __init__(self,connection):
        threading.Thread.__init__(self)
        self.connection=connection

    def run(self):
        ####
        irrelevant code here
        ####

        # Acrobat COM starts
        AVD = win32com.client.Dispatch('AcroExch.AVDoc')   # Traceback
refers to this line (89)
        pdfname=pdfname.replace('.pdf',PDFNAME_SUFFIX)
        AVD.Open(pdf.name, pdfname) # ////////
        print 'opened avdoc'
==================================

TRACEBACK:
==================================
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 486, in __bootstrap_inner
    self.run()
  File "D:\Ferdinand\#Storage\Ferdi-python\Acrobat Automation\temp
testing.py", line 89, in run
    AVD = win32com.client.Dispatch('AcroExch.AVDoc')
  File "C:\Python25\Lib\site-packages\win32com\client\__init__.py", line 95,
in Dispatch
    dispatch, userName =
dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
  File "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line 98,
in _GetGoodDispatchAndUserName
    return (_GetGoodDispatch(IDispatch, clsctx), userName)
  File "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line 78,
in _GetGoodDispatch
    IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
pythoncom.IID_IDispatch)
com_error: (-2147221008, 'CoInitialize has not been called.', None, None)
==================================

TIA. Best regards,
Ferdi
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From mal at egenix.com  Tue Feb 10 08:25:56 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Tue, 10 Feb 2009 14:25:56 +0100
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <49918064.4030201@egenix.com>

On 2009-02-10 10:26, Phillip B Oldham wrote:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
> 
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
> 
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.

>>> from mx.DateTime import DateTime
>>> DateTime(2009,10,2,7,0,0).ticks()
1254459600.0

http://www.egenix.com/products/python/mxBase/mxDateTime/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 10 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From tino at wildenhain.de  Tue Feb 10 08:30:11 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 10 Feb 2009 14:30:11 +0100
Subject: python ssh and Tetia SSH server
In-Reply-To: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>
References: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>
Message-ID: <49918163.7020002@wildenhain.de>

loial wrote:
> Anyone out there any experience of using python ssh modules to connect
> to the Tetia SSH server from SSH (ssh.com)?

Did you call their support? Personally I see no reason why
paramiko http://www.lag.net/paramiko/ should not work, given
that openssh ssh client also worked in the past with ssh.com
ssh.

Maybe you can get a test version and just try it out.

Regards
Tino
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From durumdara at gmail.com  Tue Feb 10 08:44:25 2009
From: durumdara at gmail.com (durumdara)
Date: Tue, 10 Feb 2009 14:44:25 +0100
Subject: Cheetah and hungarian charset...
In-Reply-To: <498B03F9.3040109@gmail.com>
References: <498B03F9.3040109@gmail.com>
Message-ID: <499184B9.7070903@gmail.com>

Hi!

Ok, I forget to set encodings.

from Cheetah.Template import Template
d = {'a' : 'alm?s'}
tp = Template("# encoding: iso-8859-2\nhello world ???? ${d['a']}!", 
searchList = {'d': d})
print tp

sys.exit()

This code is working for me in Windows.

dd

2009.02.05. 16:21 keltez?ssel, durumdara ?rta:
> Hi!
>
> I wanna ask that have anyone some exp. with Cheetah and the non-ascii 
> chars?
>
> I have a site. The html template documents are saved in ansi format, 
> psp liked them.
> But the cheetah parser makes ParseError on hungarian characters, like 
> "?", "?", "?", etc. When I remove them, I got good result, but I don't 
> want to remove them all...
>
> I cannot parse them. Please help me, how to force cheetah to eat them 
> all?
>
> Thanks for your help:
>     dd
>



From stephane at tinyerp.com  Tue Feb 10 09:05:45 2009
From: stephane at tinyerp.com (Stephane Wirtel)
Date: Tue, 10 Feb 2009 15:05:45 +0100
Subject: OpenERP 5.0 - Fully developed with Python
Message-ID: <499189B9.1050902@tinyerp.com>

OpenERP 5.0 is out !
====================

Why do I talk about OpenERP on this mailing list ? Because OpenERP is fully developed with Python

That major enhancement of Open ERP can now answer to all the needs of a business. Open ERP V5 not only provides management functions, but also all functionalities necessary to a SMB, like : a process 
management by modules, a wiki, a webmail, a Business Intelligence (Cube OLAP),  a Document Management System, an eCommerce, an idea box, etc.

Emphasis was placed on an extreme simplification of the software for the new users, a carefully designed ergonomy of the web client with, amongst others, drag&drop, Gantt graph, editable processes, 
etc., and more then 350 modules for specific sectors and big companies.

This new version comes with a full review of the web site giving access to more then 1500 pages of documentations on business management and a reorganization of the community sources build upon the 
Open Object framework. Free cycles of conferences are planned with the version 5.0 release of Open ERP.

Thanks to its huge community, Open Object produce more then 20 modules a month. The Open Object community it is more then 1000 contributors, 126 development branches in parallel, an average of 400 new 
functinalities or bugfix per month, one commit every 5 minutes and functional and technical  experts specialized by activity and working in teams.

The rise of Open Object and the diversity of the projects makes it an unmatched framework composed of more then 400 modules installable in a few clicks to cover all kinds of need or to simply start, 
with a simple module, to answer a simple need. Then, you can install other functionalities to come to a fully integrated and automaized system.

Open ERP v5 is characterized by the appearance of many functionalities far beyond the perimeter of traditional management.
One can underline the following innovations:

* A integrated wiki.
* An integrated document management system.
* A Business Intelligence (BI) using a OLAP database.
* An integrated BPM (management of process).
* A web portal for clients and suppliers.
* Improvement of translations (1 translation file by language and module).
* A touchscreen point of sale.
* A full Ajax webmail .
* A shared calendar. 	
* Plugins for Outlook, OpenOffice, ms. Office, Thunderbird.
* An integrated eCommerce, etc

This new release offers 3 user interfaces :
* the rich application client for a day to day advanced use,
* the web interface allowing a remote access and an easy deployment,
* the QT client that perfectly fits in a KDE environment.

Numerous improvements have been added to the client interfaces, like :
* dynamic graphs and dashboards,
* really ergonomic calendar views,
* dynamic Gantt graphs for planning,
* workflows editors,
* a fully integrated documentation,
* a dynamic process view used for the end-user training,
* etc.

The web version of Open ERP includes numerous functions to  modify or create your own application :
* an visual view editor,
* an object editor,
* a workflow (process) editor,
* an Open Office integrated report editor
* a statistics engine (BI cube),
* etc.

URL: http://www.openerp.com
URL: http://www.openobject.com
DOC: http://doc.openerp.com
Screencast: http://www.openerp.tv
LaunchPad Project: http://launchpad.net/openobject
-- 
Stephane Wirtel - "As OpenERP is OpenSource, please feel free to contribute."
Developper - Technical Instructor OpenERP
OpenERP - Tiny SPRL
Chaussee de Namur, 40
B-1367 Gerompont
Tel: +32.81.81.37.00
Web: http://www.tiny.be
Web: http://www.openerp.com
Planet: http://www.openerp.com/planet/
Blog: http://stephane-wirtel-at-tiny.blogspot.com
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From mail at timgolden.me.uk  Tue Feb 10 09:14:51 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 14:14:51 +0000
Subject: COM and threading, "CoInitialize"?
In-Reply-To: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>
References: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>
Message-ID: <49918BDB.6020600@timgolden.me.uk>

Ferdinand Sousa wrote:
> Greetings to list members,
> 
> I am trying to use an Acrobat COM object in a class that is subclassed from
> threading.Thread.
> Since threading.Thread is subclassed, the __init__ method of the inheriting
> class must explicitly call the threading.Thread.__init__ method of the
> parent. I guess I'm missing something similar for the COM object. Threading
> code and traceback below. Any pointers?

[... snip lots of code and traceback ...]

> com_error: (-2147221008, 'CoInitialize has not been called.', None, None)
> ==================================

Well, much as I may grumble about opaque error messages, you're not going
to find one much more explicit than this. Try calling CoInitialize,
once per thread, eg before your Dispatch line. You'll have to import
pythoncom and then just call pythoncom.CoInitialize ()

TJG


From jldunn2000 at googlemail.com  Tue Feb 10 09:21:46 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 06:21:46 -0800 (PST)
Subject: Using paramiko rsa key
Message-ID: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>

I want to connect via ssh from a python script on windows to an AIX
server running openSSH using rsa keys rather than a password.

Can anyone provide me with /point me at  a simple tutuorial on the
steps I need to go though in terms of geneerating the key, installing
on the server and connecting in my python code?

Thanks in advance.





From philip at semanchuk.com  Tue Feb 10 10:06:50 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:06:50 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
Message-ID: <2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>


On Feb 9, 2009, at 10:26 PM, kpp9c wrote:

> okay... for the life of me i do not see any Python Launcher.app and i
> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
> installed the dev kit.
>
> Where the heck is this application?

Hi kp,
I don't seem to have any such beast on my system except for the one  
in /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?




From tino at wildenhain.de  Tue Feb 10 10:11:12 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 10 Feb 2009 16:11:12 +0100
Subject: Using paramiko rsa key
In-Reply-To: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
Message-ID: <49919910.50303@wildenhain.de>

loial wrote:
> I want to connect via ssh from a python script on windows to an AIX
> server running openSSH using rsa keys rather than a password.
> 
> Can anyone provide me with /point me at  a simple tutuorial on the
> steps I need to go though in terms of geneerating the key, installing
> on the server and connecting in my python code?

Sure, where can we send the invoice too?

Regards
Tino
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From philip at semanchuk.com  Tue Feb 10 10:11:32 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:11:32 -0500
Subject: STMP, mail, sender-from, to-bcc-addr
In-Reply-To: <4991733E.4040608@gmail.com>
References: <4991733E.4040608@gmail.com>
Message-ID: <34E7920F-9155-4846-BC0F-8BFDEA3931B9@semanchuk.com>


On Feb 10, 2009, at 7:29 AM, durumdara wrote:

> Hi!
>
> I wanna ask that have anyone some experience with email.msg and  
> smtplib?
>
> The email message and smtp.send already have "sender/from" and  
> "recip/addr to".
> Possible the smtp components does not uses the email tags if I not  
> define them only in the message?
>
> Can I do same thing as in GMAIL that the mail does not have TO, only  
> BCC tags/recipients, and no one of the recipients who knows about  
> the each others?

Hi dd,
I'm not exactly sure what you're asking, but my memories of  
implementing BCC are that there is no BCC tag. It's your job as the  
programmer building the application that sends the message to send the  
mail to everyone on the BCC list. Something like this:

for recipient in bcc:
    send_mail(to=recipient)

Hope this helps
Philip


From philip at semanchuk.com  Tue Feb 10 10:29:15 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:29:15 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <gmq5fk$rdh$1@ger.gmane.org>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>	<gmq0hi$8gv$1@ger.gmane.org>
	<BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
	<gmq5fk$rdh$1@ger.gmane.org>
Message-ID: <57C5AC52-6B7B-4B35-87FD-C1E065AD850E@semanchuk.com>


On Feb 9, 2009, at 3:59 PM, Christian Heimes wrote:

> Philip Semanchuk wrote:
>> Yes, that's accurate except for the word "forgot". To forget  
>> something
>> one must first know it. =) I found the threading API documentation
>> difficult to follow, but I suppose that what I'm doing is a little
>> unusual so if it is not well-documented territory, that's what I  
>> get for
>> wandering off the map.
>
> I see. Apparently the threading and embedding docs don't cover your
> case. The docs at
> http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock
> and http://docs.python.org/extending/embedding.html should explain how
> and when to initialize Python threads. Please report a documentation  
> bug at
> http://bugs.python.org/.

I read that several times and eventually got my code working. I  
wouldn't say that the documentation didn't cover my case (implementing  
a callback). I'd say that it doesn't cover *any* cases in particular.  
It's more like a list of tools for manipulating the GIL and thread  
state and an explanation of the need for them rather than a tutorial  
on how to use them. The latter is what I needed, but as I said, what  
I'm doing is atypical and I think it is reasonable to expect thin  
documentation on atypical situations.

> PS: I know a great way to learn more about Python's internal threading
> CAPI: fix your code, test it and attach a doc patch to your bug  
> report.
> *hint* :)

I will file a bug on a least one specific point which is that  
PyGILState_Ensure() acquires the GIL and PyGILState_Release() appears  
to release it; the latter point is undocumented.

Cheers
Philip


From rodmena.com at gmail.com  Tue Feb 10 10:38:37 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Tue, 10 Feb 2009 07:38:37 -0800 (PST)
Subject: Uploading big files wit cherrypy
Message-ID: <366595b2-226c-48e4-961d-85bd0ce4bd9a@h16g2000yqj.googlegroups.com>

I use this code to upload using cherrypy:
#========Code Start==========
class NoteServer(object):
    _cp_config = { 'tools.sessions.on': True }

    def index(self):
        return """
        <html><body>
            <form action="upload" method="post" enctype="multipart/
form-data">
            filename: <input type="file" name="myFile" /><br />
            <input type="submit" />
            </form>
            <p>
            Pars Studios, 2009
            </p>
        </body></html>
        """
        #~ return compose().run()
    index.exposed = True
    def upload(self, myFile):
        out = """<html>
        <body>
            myFile length: %s<br />
            myFile filename: %s<br />
            myFile mime-type: %s
        </body>
        </html>"""

        # Although this just counts the file length, it demonstrates
        # how to read large files in chunks instead of all at once.
        # CherryPy uses Python's cgi module to read the uploaded file
        # into a temporary file; myFile.file.read reads from that.
        size = 0
        allData=''
        while True:
            data = myFile.file.read(8192)
            allData+=data
            if not data:
                break
            size += len(data)
        savedFile=open(myFile.filename, 'wb')
        savedFile.write(allData)
        savedFile.close()
        return out % (size, myFile.filename, myFile.type)
        #~ return allData
    upload.exposed = True
#========Code End============

But I couldn't upload files bigger than 100Mb.
Why and what is workaround?

Thanks in advanced.


From rschroev_nospam_ml at fastmail.fm  Tue Feb 10 10:39:56 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Tue, 10 Feb 2009 16:39:56 +0100
Subject: STMP, mail, sender-from, to-bcc-addr
In-Reply-To: <mailman.9228.1234272830.3487.python-list@python.org>
References: <mailman.9228.1234272830.3487.python-list@python.org>
Message-ID: <hdhkl.11634$9u6.6137@newsfe27.ams2>

durumdara schreef:
> Hi!
> 
> I wanna ask that have anyone some experience with email.msg and smtplib?
> 
> The email message and smtp.send already have "sender/from" and 
> "recip/addr to".
> Possible the smtp components does not uses the email tags if I not 
> define them only in the message?

smtplib.SMTP.sendmail() does not look in the message to find the sender
or recipients; it only uses the parameters you pass.

> Can I do same thing as in GMAIL that the mail does not have TO, only BCC 
> tags/recipients, and no one of the recipients who knows about the each 
> others?

Include the BCC-recipients in the call to sendmail(), but don't put them
in the email message itself. Include TO-recipients in both. In other
words, what you put in the TO-header is what all recipients will see;
what you pass to sendmail() is what recipients the mail will be send to.
Simple example (not tested):

from_addr = 'foo at example.com'
to_addr = ['bar at example.com', 'xyzzy at example.com']
bcc_addr = ['spam at example.com', 'eggs at example.com']

msg = """From: %s
To: %s
Subject: test

hello
""" % (from_addr, ', '.join(to_addr))

smtp = smtplib.SMTP(...)
smtp.sendmail(from_addr, to_addr + bcc_addr, msg)


-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From bj_666 at gmx.net  Tue Feb 10 10:47:57 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 10 Feb 2009 15:47:57 GMT
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
	<34d373ad-52d2-4d38-94b7-d566a5a5dd58@s20g2000yqh.googlegroups.com>
Message-ID: <6vdltdFjele5U2@mid.uni-berlin.de>

On Tue, 10 Feb 2009 02:11:10 -0800, Michele Simionato wrote:

> Unfortunately there is no good solution. If you have a single
> inheritance hierarchy and you do not use super, you make it impossible
> for users of your hierarchy to subclass it by using multiple
> inheritance in a cooperative way (this is not polite).

So I'm impolite.  :-)  I'm using multiple inheritance only for mixin 
classes and even that quite seldom.  No `super()` in my code.

Ciao,
	Marc 'BlackJack' Rintsch


From jldunn2000 at googlemail.com  Tue Feb 10 10:48:46 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 07:48:46 -0800 (PST)
Subject: Using paramiko rsa key
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
Message-ID: <41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>

Can anyone be a little more helpful than Tino?

I have generated the key file as follows on windows and ftp'd the
id_rsa.pub file to the .ssh directory on the server and renamed to
authorized_keys


import paramiko


key = paramiko.RSAKey.generate(2048)

key.write_private_key_file('Z:/id_rsa')
file = open('Z:/id_rsa.pub','w')
file.write("ssh-rsa " +key.get_base64())
file.close()

But when I try to connect as follows I get an authentication failed
error.


import paramiko

paramiko.util.log_to_file('demo_sftp.log')

try:
    try:
        key = paramiko.RSAKey.from_private_key_file("Z:/id_rsa") #the
generated private key
    except Exception, e:
        print str(e)
    t = paramiko.Transport(('10.5.1.15', 22))
    print "here"
    t.start_client()
    t.auth_publickey('prod2',key)

    if t.is_authenticated():
        print "Got it!"
    sftp = paramiko.SFTPClient.from_transport(t)
    dirlist = sftp.listdir('.')
    print "Dirlist:", dirlist
    t.close()
except Exception, e:
    print str(e)
    t.close()





From martin at marcher.name  Tue Feb 10 10:58:40 2009
From: martin at marcher.name (Martin)
Date: Tue, 10 Feb 2009 16:58:40 +0100
Subject: how to find out vesion of a python module
In-Reply-To: <90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
	<mailman.9188.1234228035.3487.python-list@python.org>
	<90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>
Message-ID: <5fa6c12e0902100758t510b6c89q379f87f3ca59f6e5@mail.gmail.com>

Hi,

2009/2/10 Atishay <contactatishay at gmail.com>:
> Now the point is, how do I avoid setting LD_LIBRARY_PATH everytime for
> python? I know I can write a bash script, but I am sure python would
> have some feature that I can tweak to make it work.

On debian you can modify

 * /etc/ld.so.conf and/or
 * /etc/ld.so.conf.d/....

to include the path you need.

hth
martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From bob.uuca at gmail.com  Tue Feb 10 11:07:30 2009
From: bob.uuca at gmail.com (Mac)
Date: Tue, 10 Feb 2009 08:07:30 -0800 (PST)
Subject: Change in cgi handling of POST requests
Message-ID: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>

We just upgraded Python to 2.6 on some of our servers and a number of
our CGI scripts broke because the cgi module has changed the way it
handles POST requests.  When the 'action' attribute was not present in
the form element on an HTML page the module behaved as if the value of
the attribute was the URL which brought the user to the page with the
form, but without the query (?x=y...) part.  Now FieldStorage.getvalue
() is giving the script a list of two copies of the value for some of
the parameters (folding in the parameters from the previous request)
instead of the single string it used to return for each.  I searched
this newsgroup looking for a discussion of the proposal to impose this
change of behavior, and perhaps I wasn't using the right phrases in my
search, but I didn't find anything.  I see that Perl still behaves the
way pre-2.6 Python used to (not that I view that as a reason for
anything).  We'll work around the breakage by explicitly setting the
'action' attribute everywhere, of course, but I usually see some
discussion (often heated) of the impact of behavior changes on
existing software when something like this is in the works.  Did I
miss it?

I also noted that the module is making some deprecated use of the
BaseException class.

Cheers.


From rdmurray at bitdance.com  Tue Feb 10 11:13:47 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 16:13:47 +0000 (UTC)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
	<7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>
	<gmrtvd$eb4$2@ger.gmane.org>
Message-ID: <gms93r$2gq$1@ger.gmane.org>

Lie Ryan <lie.1296 at gmail.com> wrote:
> On Tue, 03 Feb 2009 20:08:34 -0800, Stephen Hansen wrote:
> 
> > There is no need to try to make sure something is
> > executed/compiled only once in Python like you may want to do in C.
> > Every module is only ever compiled once: if you import it ten times in
> > ten different places only the first will compile and execute the code,
> > the rest of the calls will return that original module again.
> 
> <nitpick>
> If you import a module, it will be recompiled only if the module changes 
> from the precompiled .pyc/.pyo. OTOH, if you run a module, it will be 
> recompiled every time even if there is no change.
> </nitpick>

As long as we are nitpicking, and trying to clarify things for a new
Python user....let me give it a try.  By doing this I get to find out
if I really understand it as well as I think I do :)

If a file is run as a script ('python somefile.py', or shebang magic on
unix or the equivalent on other OSes), then the code is compiled/executed
each time that is done.  If a module is imported (or something is imported
from a module), then the _first time_ during a given run of the python
interpreter that such an import is done, the timestamp of the .py file
(if it exists) is compared to the timestamp of the .pyc/.pyo file, and
if the .py is newer, the .py file is compiled to byte code, the resulting
byte code is written to the .pyc (or .pyo), and the byte code is executed.
If the .py file is older, then the saved byte code is loaded and executed.
It is the execution of the byte code that creates the module's namespace
(a collection of names pointing to objects).  This namespace is registered
in sys.modules under the module's name.  During the remainder of that
run of the python interpreter, any import statement that draws from
that module simply loads a pointer to the module's namespace (or to
objects referenced by the module's namespace if it is a 'import from')
into the local namespace.

--RDM



From jasiu85 at gmail.com  Tue Feb 10 11:23:45 2009
From: jasiu85 at gmail.com (Jasiu)
Date: Tue, 10 Feb 2009 08:23:45 -0800 (PST)
Subject: version in setup.cfg
References: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
	<6vbg8kFj8k12U1@mid.uni-berlin.de>
Message-ID: <ab5faadc-1c47-47a0-885a-764301fe9ec1@v39g2000yqm.googlegroups.com>

> I don't think so. But there are several other options:

I was afraid of that.

Thanks anyway!

Mike


From jef.mangelschots at gmail.com  Tue Feb 10 11:26:42 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Tue, 10 Feb 2009 08:26:42 -0800 (PST)
Subject: import wx works interactive but not from script
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
	<mailman.9215.1234257018.3487.python-list@python.org>
Message-ID: <35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>

I ran the script from a command line, so it is not a file association
thing.
I do have multiple versions of Python installed on that machine. I
will uninstall them all and install a single version from clean.
Thanks for the suggestion


From mail at timgolden.me.uk  Tue Feb 10 11:39:29 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 16:39:29 +0000
Subject: import wx works interactive but not from script
In-Reply-To: <35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>	<mailman.9215.1234257018.3487.python-list@python.org>
	<35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
Message-ID: <4991ADC1.3040200@timgolden.me.uk>

jefm wrote:
> I ran the script from a command line, so it is not a file association
> thing.

Ummm... if you ran it by just typing the script name --
c:\test\whatever.py rather than c:\pythonxx\python c:\test\whatever.py --
then it certainly could be a file association issue.

> I do have multiple versions of Python installed on that machine. I
> will uninstall them all and install a single version from clean.
> Thanks for the suggestion

Hope it helps. Let us know how it turns out.

TJG


From olivierbourdon38 at gmail.com  Tue Feb 10 11:42:04 2009
From: olivierbourdon38 at gmail.com (olivierbourdon38 at gmail.com)
Date: Tue, 10 Feb 2009 08:42:04 -0800 (PST)
Subject: Tricky question about native extension packaging
Message-ID: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>

let's assume I (almost) have and extension available as a C file and
the setup.py and I want to generate from this single c file 2 .so
files using

cc -DOPTION1 x.c to produce x_1.so
cc -DOPTION2 x.c to produce x_2.so

and at runtime depending of my OS version either load x_1 or x_2

any (easy) way to do that and deliver the result as a single .egg
file ? What should the setup.py look like ?

Thanks for any insight



From quian.xu at stud.tu-ilmenau.de  Tue Feb 10 11:48:39 2009
From: quian.xu at stud.tu-ilmenau.de (Qian Xu)
Date: Tue, 10 Feb 2009 17:48:39 +0100
Subject: UnitTest break on failure
Message-ID: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>

Hi All,

i am writing unit tests and have got a problem:
I want to test some code sequence like:

 self.assertEquals(testMethod1(), expected_value1);
 self.assertEquals(testMethod2(), expected_value2);

However, if the first test item is failed, no more tests will be executed.
Can I tell Python, 
1. go ahead, if a failure is occurred. 
2. stop, if an error is occurred?


Best regards,
Qian Xu


From benjamin.kaplan at case.edu  Tue Feb 10 11:49:59 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 10 Feb 2009 11:49:59 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
Message-ID: <ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>

On Tue, Feb 10, 2009 at 10:06 AM, Philip Semanchuk <philip at semanchuk.com>wrote:

>
> On Feb 9, 2009, at 10:26 PM, kpp9c wrote:
>
>  okay... for the life of me i do not see any Python Launcher.app and i
>> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
>> installed the dev kit.
>>
>> Where the heck is this application?
>>
>
> Hi kp,
> I don't seem to have any such beast on my system except for the one in
> /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?



It should be in there. It's in the Python framework folder instead of the
normal applications folder, and spotlight doesn't find it. Try checking
/System/Library/Frameworks/Python.framework/versions/2.5/Resources.


>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
An HTML attachment was scrubbed...
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From philip at semanchuk.com  Tue Feb 10 12:03:02 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 12:03:02 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
	<ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>
Message-ID: <3EDA106D-B8EA-4AD9-8F92-EC222973D159@semanchuk.com>


On Feb 10, 2009, at 11:49 AM, Benjamin Kaplan wrote:

> On Tue, Feb 10, 2009 at 10:06 AM, Philip Semanchuk <philip at semanchuk.com 
> >wrote:
>
>>
>> On Feb 9, 2009, at 10:26 PM, kpp9c wrote:
>>
>> okay... for the life of me i do not see any Python Launcher.app and i
>>> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
>>> installed the dev kit.
>>>
>>> Where the heck is this application?
>>>
>>
>> Hi kp,
>> I don't seem to have any such beast on my system except for the one  
>> in
>> /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?
>
>
>
> It should be in there. It's in the Python framework folder instead  
> of the
> normal applications folder, and spotlight doesn't find it. Try  
> checking
> /System/Library/Frameworks/Python.framework/versions/2.5/Resources.

Good call, you are 100% correct, with the footnote that Versions in  
that path should be capitalized.

/System/Library/Frameworks/Python.framework/Versions/2.5/Resources





From martin.hellwig at dcuktec.org  Tue Feb 10 12:08:38 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 10 Feb 2009 17:08:38 +0000
Subject: Using paramiko rsa key
In-Reply-To: <41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
	<41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
Message-ID: <4991b496$0$188$e4fe514c@news.xs4all.nl>

loial wrote:
> Can anyone be a little more helpful than Tino?
<cut>
I'll do some freebie hints :-)
What I would do is try first whether key authentication works at all, 
for example following a tutorial like 
http://the.earth.li/~sgtatham/putty/0.53b/htmldoc/Chapter8.html

And if that works translate it to the relevant python code.

-- 
mph


From aahz at pythoncraft.com  Tue Feb 10 12:14:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 09:14:21 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
	<mailman.8714.1233686338.3487.python-list@python.org>
Message-ID: <gmscld$sht$1@panix3.panix.com>

In article <mailman.8714.1233686338.3487.python-list at python.org>,
 <rdmurray at bitdance.com> wrote:
>Quoth aahz at pythoncraft.com (Aahz):
>> In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>>* Aahz (2 Feb 2009 09:29:43 -0800)
>>>> 
>>>> Polarized sunglasses don't work too well with LCD monitors
>>>
>>>Well, the answer to your issue with syntax highlighting is to use a 
>>>/decent/ highlighting colour scheme. Don't use that all 
>>>purple/red/green/yellow/blue one. That's for psychedelic trips.
>>>
>>>Use a decent colour scheme for adults and you will see that you will 
>>>benefit from syntax highlighting.
>> 
>> Then I have the problem of copying around the syntax highlighting
>> configuration to every computer I use.
>
>Well, _that's_ easy to fix.  I have a little bash script called
>'synchome' that uses rsync to update the home directory on any of the
>remote machines on which I work.  I've had to install rsync on one or
>two of the boxes, but that's a useful thing to do anyway.
>
>(Granted, I still have a couple bugs to work out, where I haven't taken
>the time to conditionalize things properly for some of the more exotic
>machine configurations, but hey, if I spend more time on those machines
>I'll get around to it...)

The need to conditionalize for different environments is the main reason
I haven't bothered, combined with the need to spend time working out a
decent color scheme I'm happy with.  I've been working this way (plain
vi) for more than twenty years and I don't see much point fixing what
ain't b0rken.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From aquil.abdullah at gmail.com  Tue Feb 10 12:50:27 2009
From: aquil.abdullah at gmail.com (aha)
Date: Tue, 10 Feb 2009 09:50:27 -0800 (PST)
Subject: Logging in Python
Message-ID: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>

Hello All,

I have an application where logging may need to be configured in
multiple places.  I've used the Python Logging Framework for sometime,
but I'm still not sure how to test if logging has configured.  For
example, I have modules A, B, and C.

Below is some pseudo code...
moduleA

class A(object):
  def __init__(self):
    ...

startLogging(config):
  # Configure logging
  # global logger
  ...

moduleB
import moduleA
from myconfig import MyConfig
class B(object):
  def __init__(self):
    # self.config = MyConfig()
    # if logging has started [HOW DO YOU DO THIS?]
    #   self.logger = logging.getLogger("moduleB")
    # else
    #   self.logger = moduleA.startLogging(self.config)
    # moduleA.startLogging
    ...

Where I need help is determining if a logger has already been
configured.  Any advice?

Aquil


From cosmo_general at yahoo.com  Tue Feb 10 12:55:32 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Tue, 10 Feb 2009 09:55:32 -0800 (PST)
Subject: Can urllib check path exists on server?
Message-ID: <7abd3c00-e77e-47b8-8b2d-436bc6919760@h16g2000yqj.googlegroups.com>

Hi Folks,

urllib bridges up a client to a server, it works fine. I wonder: is
there a method that can check the existence of a file in the server
side? We can check such an existence on local filesystem by using
os.path.exists(), can I do such a check on server? For example,
http://somedomain.com/foo/bar.jpg is residing in a hosting server, can
I use urllib to check if bar.jpg file existing or not? Thanks!

Muddy Coder


From mcfletch at vrplumber.com  Tue Feb 10 13:07:50 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 10 Feb 2009 13:07:50 -0500
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <4991C276.5020602@vrplumber.com>

rantingrick wrote:
...
> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps. I now believe i am
> ready to start this endeavor and i am currently looking for fellow
> Python programmers (no matter what skill level) to get started
> brainstorming this design.
>   
I'm certainly willing to help with brainstorming...
> Of course Python will limit the speed here, but at this point i want
> to get a template up and running. Speed does not matter at this point,
> and optimizations can come along later as i am sure a few complete re-
> writes are inevitable :)
>   
Simple CAD systems without shading/texturing shouldn't have any real 
performance issues under Python.  We had 3D CAD back in 1993 sufficient 
to build reasonably complex environments when I was in architecture.  
Python's only about 10x slower than C, and if you dump large C-level 
arrays into the graphics card your performance can be quite reasonable.  
If you have a visit @ every face/line for every refresh you'll spend all 
your time in the scenegraph traversal.
> There will need to be mouse picking as i see this application as a
> very interactive environment. Of course in the beginning all
> interaction will most likely be in a command line type manner until
> the functionality can be worked out.
>   
Mouse picking is pretty easy, you can either use simple ray-intersection 
on your bounding-box hierarchy (easiest/fastest for CAD-type structures) 
or render-pass based stuff (if you have lots of organic shapes that will 
show through each other a lot and you want to be able to click on the 
thing "peeking through" behind another thing.  Both are very well 
documented and easy/fast to implement if/when your scenegraph is 
tracking bounding volumes.
> There will need to be a hierarchy of instancing and grouping within
> the model to facilitate easy transformation of entities within the
> model.
>   
Transform and Group nodes are definitely a good idea, as are "USE" nodes.
> I am not too worried about any sort of texturing at this point. I want
> to squeeze as much speed as possible and prettiness will come in due
> course. I also have no plans for layering, or multiple scenes at this
> time. Simple functionality is the end game here.
>   
Fair enough.
> #-- Entities --#
>  face
>  line-segment
>   
That's pretty low-level.  You may want to work with "meshes" or the 
like, so that you select the mesh, then modify the faces/vertices/edges 
(a-la 3DSMax/Maya), particularly where you want faces to share 
coordinates.  Just a thought.
> #-- Hierarchy --#
>  Entity (one face, or line-segment)
>   
Again, seems like you'd want something a little less soup-of-lines-ish, 
but then that's a 3D Modeler bias, rather than a CAD bias (where often 
it really is just a soup of lines).
>  Group (contained of multiple entities that can be translated,
> rotated, scaled as one)
>   
Transform node.
>  Instance (component definition)
>   
Node with DEF + USE's node instance.  Or, if you mean a reusable, 
parameterized node, a PROTO definition and PROTO-using nodes.
> #-- Tools --#
>  line
>  rect
>  circle
>  arc
>   
You'll want mechanisms to define the current coordinate system as well 
(think AutoCAD "UCS") so that you can precisely align the work you are 
doing without needing to calculate cos/sin/tan for everything.  That is, 
your rotation/translation/scale should allow you to draw *within* the 
resulting Transform.  You'll likely also want to be able to translate 
objects to/from Transform spaces (i.e. reparent without moving).

Also (from my many-year-old recollection of doing CAD in architecture):

    * tan (when you want to draw lines tangential to a circle/arc and
      then trim)
    * chamfer/fillet (easy to code and pretty darn useful for a lot of
      detail drawings)
    * copy
    * align
    * delete/erase
    * hide/show hidden edges
    * mirror/mirror3d (used it all the time)
    * text (pretty important for CAD work)
    * snap control (critically important IMO)
    * polyline/polygon (or tools to combine lines/arcs into polygons and
      close the result for e.g. extrusion)
    * splines/nurbs or other high-order surfaces (eventually)
    * boolean operators (eventually, use a library for this unless you
      really want to learn, and even then, do it yourself and then use a
      library)

>  select
>   
Critical to get that right to make it usable.
>  rotation
>  translation
>  scale
>   
I'd suggest a Maya-like control for this as far as the GUI goes, put 
snaps on it, but make a single widget that lets you 
rotate/translate/scale.  You'll also want such things as 
scale-this-line-to-be-this-size rescales (scale, pick two points, pick 
two other points, scale is the relative length of the two points)...
>  extrusion along path
>   
Available in GLE extensions (nodes available too).  Also want "revolve" 
(extrude around a path, which may be a point).  Depending on your model, 
you may want to allow for converting extrusions to faces in order to 
allow tweaking the resulting extrusion.  You'll want/need a UI to "open" 
the extrusion and change the backbone and sweep shapes.
>  measurement
>   
measurement == dimensioning (dim*)?  Or just on-screen measurement 
(dist).  Both are useful.
> So there it is. Any takers? :)
>   
I can't even begin to commit any real time to another project (I barely 
have time to work on the ones I already have), but if you need feedback, 
feel free to email me.  Most of the graphics stuff sounds like stuff you 
could build on top of OpenGLContext or COIN or any of the generic 
scenegraph libraries.  They aren't really CAD-focused, but they've 
already got the ability to draw the things you're wanting to work on, 
and have the Transforms and similar support to make the coding a 
reasonable task.  However, they're closer to a Maya/3DSMax model than 
AutoCAD, so maybe you'll decide you want to go your own way.

You may want to check out PythonCAD as well, which IIRC does 2D-only CAD.

Anyway, hope this was some help.  Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From rdmurray at bitdance.com  Tue Feb 10 13:08:25 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 18:08:25 +0000 (UTC)
Subject: Can urllib check path exists on server?
References: <7abd3c00-e77e-47b8-8b2d-436bc6919760@h16g2000yqj.googlegroups.com>
Message-ID: <gmsfqp$t08$1@ger.gmane.org>

Muddy Coder <cosmo_general at yahoo.com> wrote:
> urllib bridges up a client to a server, it works fine. I wonder: is
> there a method that can check the existence of a file in the server
> side? We can check such an existence on local filesystem by using
> os.path.exists(), can I do such a check on server? For example,
> http://somedomain.com/foo/bar.jpg is residing in a hosting server, can
> I use urllib to check if bar.jpg file existing or not? Thanks!

urllib implements the http protocol for http URLs, so you can only do
what the http protocol allows.  Thus if http://somedomain.com/foo/bar.jpg
is a valid URL on that server, you can do a urlopen, and then check
the 'getcode' method on the returned object to see if you got a '404'
(not found) code back.

--RDM



From rdmurray at bitdance.com  Tue Feb 10 13:20:02 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 18:20:02 +0000 (UTC)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
	<mailman.8714.1233686338.3487.python-list@python.org>
	<gmscld$sht$1@panix3.panix.com>
Message-ID: <gmsggh$uot$1@ger.gmane.org>

aahz at pythoncraft.com (Aahz) wrote:
> In article <mailman.8714.1233686338.3487.python-list at python.org>,
>  <rdmurray at bitdance.com> wrote:
> >Quoth aahz at pythoncraft.com (Aahz):
> >> Then I have the problem of copying around the syntax highlighting
> >> configuration to every computer I use.
> >
> >Well, _that's_ easy to fix.  I have a little bash script called
> >'synchome' that uses rsync to update the home directory on any of the
> >remote machines on which I work.  I've had to install rsync on one or
> >two of the boxes, but that's a useful thing to do anyway.
> >
> >(Granted, I still have a couple bugs to work out, where I haven't taken
> >the time to conditionalize things properly for some of the more exotic
> >machine configurations, but hey, if I spend more time on those machines
> >I'll get around to it...)
> 
> The need to conditionalize for different environments is the main reason
> I haven't bothered, combined with the need to spend time working out a
> decent color scheme I'm happy with.  I've been working this way (plain
> vi) for more than twenty years and I don't see much point fixing what
> ain't b0rken.

I did the conditionalization bit by bit, and there isn't much of it
since I can install my "standard environment" (zsh, screen, vim) on
almost all the boxes on which I work.

I was as you are on colorization until about three months ago.  Then I
figured out how to get 256 colors in my xterms and found 'desert.vim',
which works for me (nice gentle colors).  Now I'm a happy user of
colorization, and have even written a colorizor for a file whose syntax
I defined, that helps me avoid making stupid typos in said file, that
I used to make far too often.  In other words, the benefits tipped over
into outweighing the costs for me just recently...

--RDM



From pythonsky at sky.com  Tue Feb 10 13:22:36 2009
From: pythonsky at sky.com (Gary Wood)
Date: Tue, 10 Feb 2009 18:22:36 -0000
Subject: python3 tutorial for newbie
Message-ID: <920577A6E319438A9397A41B74AE9913@Woodygar>

Can someone recommend a good tutorial for Python 3, ideally that has tasks or assignments at the end of each chapter. 
Please,
-------------- next part --------------
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From castironpi at gmail.com  Tue Feb 10 13:39:59 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 10 Feb 2009 10:39:59 -0800 (PST)
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au> 
	<mailman.9219.1234269022.3487.python-list@python.org>
Message-ID: <dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>

On Feb 10, 6:30?am, "andrew cooke" <and... at acooke.org> wrote:
> steven probably knows this, but to flag the issue for people who are
> looking at generators/coroutines for the first time: there's a little
> "gotcha" about exactly how the two sides of the conversation are
> synchronized. ?in simple terms: send also receives.
>
> unfortunately the example steven gave doesn't really show this, so i've
> modified it below. ?you can now see that the first next() after .send()
> receives 2, not 1. ?note that i am using python 3, so the .next() method
> is .__next__() (the asymmetry between next and send seems odd to me, but
> there you go).
>
> (in a sense this is completely logical, but if you're used to the
> asynchronous way the internet works, it can seem unintuitive)
>
> how to handle this was one of the things the original post was asking
> about (if i understood correctly).
>
> >>> def gen(n):
>
> ... ? while True:
> ... ? ? obj = yield n
> ... ? ? n += 1
> ... ? ? if obj is not None: n = obj
> ...>>> g = gen(5)
> >>> next(g)
> 5
> >>> g.__next__()
> 6
> >>> g.send(1)
> 1
> >>> next(g)
>
> 2
>
> andrew
>
> Steven D'Aprano wrote:
> > On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:
> >> I would love to see a simple code example of this if you have one; I've
> >> been wanting to do this but couldn't even get started.
>
> > Is this too simple?
>
> >>>> def gen(n):
> > ... ? ? while True:
> > ... ? ? ? ? ? ? obj = yield n
> > ... ? ? ? ? ? ? if obj is not None: n = obj
> > ...
> >>>> g = gen(5)
> >>>> g.next()
> > 5
> >>>> g.next()
> > 5
> >>>> g.send(12)
> > 12
> >>>> g.next()
> > 12
>
>

I guess a generator that counts, but skips K numbers, where K can be
varied.  For instance, you initialize it with N, the starting number,
and K, the jump size.  Then, you can change either one later on.
(Unproduced.)

>>> j= jumper( N= 1, K= 1 )
>>> next( j )
1
>>> next( j )
2
>>> j.send( K= 3 )
5
>>> next( j )
8

However, if in the caller, the 'send' and 'next' come from two
different places, then your 'send' "eats" one of your 'next's, and the
'next' code just receives 1..2..8.

The above code isn't legal (or practical), due to the 'K=3' in send.
You could do 'j.send( dict( K= 3 ) )', but you can't do 'locals
().update( result )' in your generator, unfortunately.  So you have a
big switch statement there.

One solution: You could always query a dictionary for your variables,
and do 'my_locals.update( result )', and 'my_locals[ "K" ]' for a
variable.  Then you just need some sort of collector generator to go
around the first one, and duplicate the value 'send' returns, before
going back to 'next'.  (Unproduced.)

>>> j= repeat_on_send( jumper( N= 1, K= 1 ) )
>>> next( j )
1
>>> next( j )
2
>>> j.send( dict( K= 3 ) )
5
>>> next( j )
5
>>> next( j )
8

Two solution (er, solution two), would be to give a generator object
access.  Unfortunately, generators have no 'gi_dict' attribute, so
arbitrary attributes aren't possible.  So you have to be clever.
(Unproduced.)

>>> @gen_dict
>>> def jumper...
...
>>> j= jumper( N= 1, K= 1 )
>>> next( j )
1
>>> next( j )
2
>>> j.K= 3
>>> next( j )
5
>>> next( j )
8

This gets two birds with one stone, but is it possible?


From jldunn2000 at googlemail.com  Tue Feb 10 13:41:07 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 10:41:07 -0800 (PST)
Subject: Using paramiko rsa key
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
	<41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
	<4991b496$0$188$e4fe514c@news.xs4all.nl>
Message-ID: <fba299ee-7bbb-4bf0-946c-c87fcbf0db3e@l1g2000yqj.googlegroups.com>

On 10 Feb, 17:08, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> loial wrote:
> > Can anyone be a little more helpful than Tino?
>
> <cut>
> I'll do some freebie hints :-)
> What I would do is try first whether key authentication works at all,
> for example following a tutorial likehttp://the.earth.li/~sgtatham/putty/0.53b/htmldoc/Chapter8.html
>
> And if that works translate it to the relevant python code.
>
> --
> mph

Thanks..I'll try that first


From goon12 at gmail.com  Tue Feb 10 14:07:55 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Tue, 10 Feb 2009 14:07:55 -0500
Subject: UnitTest break on failure
In-Reply-To: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
References: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
Message-ID: <6a2ccd190902101107l793f7b7ei2ef5c51cdfde3659@mail.gmail.com>

On Tue, Feb 10, 2009 at 11:48 AM, Qian Xu <quian.xu at stud.tu-ilmenau.de> wrote:
>  self.assertEquals(testMethod1(), expected_value1);
>  self.assertEquals(testMethod2(), expected_value2);
>
> However, if the first test item is failed, no more tests will be executed.
> Can I tell Python,
> 1. go ahead, if a failure is occurred.
> 2. stop, if an error is occurred?

Typically you would have a different test for two different methods,
one for each method.


From josh.dukes at microvu.com  Tue Feb 10 14:15:14 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 11:15:14 -0800
Subject: bool evaluations of generators vs lists
Message-ID: <20090210111514.07e0480a@microvu.com>

quite simply...what???

In [108]: bool([ x for x in range(10) if False ])
Out[108]: False

In [109]: bool( x for x in range(10) if False )
Out[109]: True

Why do these two evaluate differently? I was expecting that they would
evaluate the same but the generator would return true *as soon as the
first value is detected*. I'd really expect it to act more like...

def has_values(g):
     for i in g:
         return True
     return False

So what's going on here? Am I using the wrong function or is this
actually just a bug?

-- 

Josh Dukes
MicroVu IT Department


From ntwrkd at gmail.com  Tue Feb 10 14:16:23 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 11:16:23 -0800
Subject: getopt index out of range
Message-ID: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>

Hi List,
I am getting an index out of range error when trying to parse with getopt.
Probably something simple. Any suggestions are appreciated

optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
'adminServerURL=', 'action=', 'targets=', 'appDir='])


#Assign Opts
connectPassword = optlist[0][1]
adminServerURL = optlist[1][1]
action = optlist[2][1]
targets = optlist[3][1]
appDir = optlist[4][1]

#this statement never gets executed
print "Args: " + connectPassword + " " + adminServerURL + " " + action
+ " " + targets + " " + appDir

  File "/home/msacks/untitled4.py", line 23, in ?
IndexError: index out of range: 0

TIA


From aahz at pythoncraft.com  Tue Feb 10 14:18:11 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 11:18:11 -0800
Subject: subprocess.Popen - file like object from stdout=PIPE
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<4989864F.50700@skynet.be>
	<mailman.8772.1233749977.3487.python-list@python.org>
	<49899185$0$2861$ba620e4c@news.skynet.be>
Message-ID: <gmsjtj$jnj$1@panix3.panix.com>

In article <49899185$0$2861$ba620e4c at news.skynet.be>,
Helmut Jarausch  <jarausch at skynet.be> wrote:
>
>These pipes are exposed as file-like objects which can be accessed via
>the stdin, stdout or stderr (resp.) attributes of an object of class
>subprocess.Popen .

Please file a doc request at bugs.python.org
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From space.captain.face at gmail.com  Tue Feb 10 14:27:36 2009
From: space.captain.face at gmail.com (Kalibr)
Date: Tue, 10 Feb 2009 11:27:36 -0800 (PST)
Subject: Using TK and the canvas.
Message-ID: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>

Hi all. I'm experimenting with making a UI for a little (well, not
quite) script that basically draws up a tech tree to some skills from
my favorite game. What I'm aiming for looks a little like this site
here:(apologies if I'm not supposed to direct link)
http://www.anderkoo.com/uploads/271/605/NewTechTree.jpg.

Anyway, I made a script which reads data from several files and saves
the data into an array of skill objects, here's what it looks like:

#define the class
class skill:
    def __init__(self, name, description, a1, a2, rank, prereq):
        self.name = name #string (example is "Anchoring")
        self.desc = description #string (example is "blah blah blah")
        self.a1 = a1   #string with attributes affecting the skill
(Example is "Int")
        self.a2 = a2   #string
        self.rank = rank   #how hard it is to train (example is "5")
(too lazy to convert to int
        self.prereq = prereq  #any prerequsites (an array of ["skill",
"levelrequired"])

        #the trained level already
        self.skillowned = "0" #we change this later on when we access
another file :)

Finally, I set up a class which accepts a parent (normally root), and
the skill in question.
here it is:

class SkillInfo:
    def __init__(self, parent, skill):
        container = Frame(parent)
        container.pack()

        #we make this the top frame for some reason
        labelcontainer = Frame(container, height=50, width=50)
        labelcontainer.pack(side=LEFT, fill=BOTH, expand=YES)

        desccont = Frame(container, height=50, width=50) #the
description content
        desccont.pack(side=LEFT, fill=BOTH, expand=YES)

        #make a name label
        Label(labelcontainer, text=skill.name, wraplength=100).pack
(side=TOP, anchor=W)

        #print the level buttons
        for i in range(1, 6):
            button = Button(labelcontainer)
            button["text"] = "Level", i
            if int(skill.skillowned) >= i:
                button["background"] = "green"
                button["width"] = 10
            else:
                button["background"] = "red"
                button["width"] = 10
            button.pack(anchor=W)

        Label(desccont, text=("\n"+skill.desc), wraplength=100).pack()

Now I know all I have to do is set the SkillInfos parent to a canvas,
but how would I arrange and draw the lines? Thanks all :)


From Scott.Daniels at Acm.Org  Tue Feb 10 14:27:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 11:27:57 -0800
Subject: UnitTest break on failure
In-Reply-To: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
References: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
Message-ID: <xYqdnYGcHflYSQzUnZ2dnUVZ_gOWnZ2d@pdx.net>

Qian Xu wrote:
> i am writing unit tests and have got a problem:
> I want to test some code sequence like:
> 
>  self.assertEquals(testMethod1(), expected_value1);
>  self.assertEquals(testMethod2(), expected_value2);
> 
> However, if the first test item is failed, no more tests will be executed.
> Can I tell Python, 
> 1. go ahead, if a failure is occurred. 
> 2. stop, if an error is occurred?

Well, each test should be independent, so generally you are talking
about multiple tests.  If you really want a test to see if you get
through a sequence in a single test:
     import unittest
     ...
     class MyTest(unittest.TestCase):

         def test_multi_step(self):
             expectations = [(expected_value1, testMethod1),
                             (expected_value2, testMethod2),
                             (final_expected, another_test, arg1, arg2)]
             try:
                 for step, ops in enumerate(expectations):
                     self.assertEquals(ops[0], ops[1](*ops[2:]))
             except Exception, why:
                 raise ValueError('Step %s Failed: %s' % (step, why))
             # here the test passed.
     ...
     if __name__ == '__main__':
         unittest.main()

Note this gives you less information (the traceback doesn't go down
to the actual error), but it shows you what step failed.

--Scott David Daniels
Scott.Daniels at Acm.Org


From geert.discussions at gmail.com  Tue Feb 10 14:29:10 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Tue, 10 Feb 2009 20:29:10 +0100
Subject: Python DLL's for C++?
Message-ID: <4991D586.6090600@gmail.com>

Hi,

Is it possible to write DLL's in Python for applications that only 
provide C++ interfaces?  Example: NotePad++ is extendible by writing C++ 
DLL's which can call the NotePad++ interfaces.

I wonder if those DLL's also can be written in Python, which in the end 
calls the C++ interfaces of NotePad++...

-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From steve at holdenweb.com  Tue Feb 10 14:34:16 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 10 Feb 2009 14:34:16 -0500
Subject: Introduction to Python, Washington DC, March 3-5
Message-ID: <4991D6B8.2050002@holdenweb.com>

Holden Web is pleased to announce its next public introductory Python
class in the Washington, DC area on March 3-5. To enroll, or to learn
more about the class please visit:

  http://holdenweb.com/py/training/

If you have multiple students requiring training you may be interested
to know that this course can also be presented on-site.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rgruet at free dot fr  Tue Feb 10 14:38:24 2009
From: rgruet at free dot fr (Richard Gruet)
Date: Tue, 10 Feb 2009 20:38:24 +0100
Subject: ANN: Python 2.6 Quick Reference available
Message-ID: <4991d7b0$0$4785$426a34cc@news.free.fr>

The Python 2.6 Quick Reference is available in HTML and PDF formats at http://rgruet.free.fr/#QuickRef.

This time I was helped by Josh Stone for the update.

As usual, your feedback is welcome (pqr at rgruet.net).

Cheers,

Richard Gruet


From clp2 at rebertia.com  Tue Feb 10 14:38:42 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 11:38:42 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210111514.07e0480a@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
Message-ID: <50697b2c0902101138v2072f95fj19d94dba0714abb3@mail.gmail.com>

On Tue, Feb 10, 2009 at 11:15 AM, Josh Dukes <josh.dukes at microvu.com> wrote:
> quite simply...what???
>
> In [108]: bool([ x for x in range(10) if False ])
> Out[108]: False

This evaluates the list comprehension and creates an empty list, which
is considered boolean False by Python.

> In [109]: bool( x for x in range(10) if False )
> Out[109]: True

Whereas this creates a /generator object/, whose inner expression is
*not evaluated until specifically required* (e.g. by for-looping over
the generator object). Generators don't have a specially defined
truthiness critera (it's impossible to define generally -- consider
something like `x for x in all_integers if f(x)`, for a complicated
f(x), which would require a solution to the halting problem to know in
advance if it will have a non-zero length), so they end up using the
default behavior for objects with otherwise undefined boolean truth,
which is to consider them True.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From marduk at letterboxes.org  Tue Feb 10 14:39:30 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 10 Feb 2009 14:39:30 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210111514.07e0480a@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
Message-ID: <1234294770.8528.14.camel@localhost.localdomain>

On Tue, 2009-02-10 at 11:15 -0800, Josh Dukes wrote:
> quite simply...what???
> 
> In [108]: bool([ x for x in range(10) if False ])
> Out[108]: False
> 
> In [109]: bool( x for x in range(10) if False )
> Out[109]: True
> 
> Why do these two evaluate differently? I was expecting that they would
> evaluate the same but the generator would return true *as soon as the
> first value is detected*. I'd really expect it to act more like...

The first example is a list.  A list of length 0 evaluates to False.

The second example returns a generator object.  A generator object
apparently evaluates to true.  Your example is not iterating of their
values of the generator, but evaluating bool(generator_object) itself.
My feeling is that bool(generator_object) is ambiguous so shouldn't be
used to begin with.

In both examples, bool() doesn't actually iterate over the arguments.
Maybe that's what confused you.

Instead look at this:

>>> type([x for x in range(10) if False ])
<type 'list'>
>>> type((x for x in range(10) if False ))
<type 'generator'>

> def has_values(g):
>      for i in g:
>          return True
>      return False
> 
> So what's going on here? Am I using the wrong function or is this
> actually just a bug?

bool != has_values.  Check python.org for how Python determines the
"truthiness" of an object. Generally speaking the following evaluate to
False:

      * None 
      * False 
      * zero of any numeric type, for example, 0, 0L, 0.0, 0j. 
      * any empty sequence, for example, '', (), []. 
      * any empty mapping, for example, {}. 
      * instances of user-defined classes, if the class defines a
        __nonzero__() or __len__() method, when that method returns the
        integer zero or bool value False.

All other values are considered true -- so objects of many types are
always true.




From benjamin at python.org  Tue Feb 10 14:40:56 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 10 Feb 2009 19:40:56 +0000 (UTC)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
Message-ID: <loom.20090210T193904-15@post.gmane.org>

Marc 'BlackJack' Rintsch <bj_666 <at> gmx.net> writes:

> 
> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
> 
> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> >> Consider whether you really need to use super().
> >> 
> >> http://fuhm.net/super-harmful/
> > 
> > This article chiefly deals with super()'s harm in multiple inteheritance
> > situations. For the simple case, though, like that presented by the OP,
> > I believe super() is perfect.
> 
> But for the simple cases it is unnecessary because it was invented to 
> deal with multiple inheritance problems.

super() is great for single inheritance because it furthers the DRY principle
(base classes are not scattered through the code), and rather ugly use of
unbound methods. 






From exarkun at divmod.com  Tue Feb 10 14:45:23 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 10 Feb 2009 14:45:23 -0500
Subject: "Super()" confusion
In-Reply-To: <loom.20090210T193904-15@post.gmane.org>
Message-ID: <20090210194523.12853.2081273672.divmod.quotient.8354@henry.divmod.com>

On Tue, 10 Feb 2009 19:40:56 +0000 (UTC), Benjamin Peterson <benjamin at python.org> wrote:
>Marc 'BlackJack' Rintsch <bj_666 <at> gmx.net> writes:
>
>>
>> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
>>
>> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
>> >> Consider whether you really need to use super().
>> >>
>> >> http://fuhm.net/super-harmful/
>> >
>> > This article chiefly deals with super()'s harm in multiple inteheritance
>> > situations. For the simple case, though, like that presented by the OP,
>> > I believe super() is perfect.
>>
>> But for the simple cases it is unnecessary because it was invented to
>> deal with multiple inheritance problems.
>
>super() is great for single inheritance because it furthers the DRY principle
>(base classes are not scattered through the code), and rather ugly use of
>unbound methods.

It replaces one kind of repetition with another.  I think each kind is
about as unpleasant.  Has anyone gathered any data on the frequency of
changes of base classes as compared to the frequency of classes being
renamed?  I don't think either happens very often, but it might be
interesting to see some numbers.

Jean-Paul


From clp2 at rebertia.com  Tue Feb 10 14:46:24 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 11:46:24 -0800
Subject: Tricky question about native extension packaging
In-Reply-To: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>
References: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>
Message-ID: <50697b2c0902101146u1c3a36eav91654b02ddc4d897@mail.gmail.com>

On Tue, Feb 10, 2009 at 8:42 AM,  <olivierbourdon38 at gmail.com> wrote:
> let's assume I (almost) have and extension available as a C file and
> the setup.py and I want to generate from this single c file 2 .so
> files using
>
> cc -DOPTION1 x.c to produce x_1.so
> cc -DOPTION2 x.c to produce x_2.so
>
> and at runtime depending of my OS version either load x_1 or x_2

I don't know about the setup.py part of your question, but as for
choosing between 2 modules at runtime:

#file foo.py
#assuming 'foo' is the desired name of the module
from sys import platform
SUN = 'sunos5'
LINUX = 'linux2'
WIN = 'win32'

if platform == SUN:
    from x_1 import *
elif platform == LINUX:
    from x_2 import *
elif platform == WIN:
    from x_1 import *
else:
    raise RuntimeError, "Unknown/unsupported platform"


Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From version5 at gmail.com  Tue Feb 10 14:46:54 2009
From: version5 at gmail.com (nnp)
Date: Tue, 10 Feb 2009 19:46:54 +0000
Subject: Working with propositional formulae in Python
Message-ID: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>

Hey,

I'm currently working with propositional boolean formulae of the type
'A & (b -> c)' (for example). I was wondering if anybody knows of a
Python library to create parse trees and convert such formulae to
conjunctive, disjunctive and Tseitin normal forms?

Cheers,
nnp

-- 
http://www.unprotectedhex.com
http://www.smashthestack.org


From rt8396 at gmail.com  Tue Feb 10 14:51:07 2009
From: rt8396 at gmail.com (r)
Date: Tue, 10 Feb 2009 11:51:07 -0800 (PST)
Subject: Using TK and the canvas.
References: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>
Message-ID: <41c83165-d6ec-429f-ac27-7d103e0d2d2b@u13g2000yqg.googlegroups.com>

On Feb 10, 1:27?pm, Kalibr <space.captain.f... at gmail.com> wrote:
[snip]
> Now I know all I have to do is set the SkillInfos parent to a canvas,
> but how would I arrange and draw the lines? Thanks all :)

You should really check out wxPython, there is support for just this
type of thing. of course you could do this with Tkinter, but just
thinking about it makes my head hurt :).


From fetchinson at googlemail.com  Tue Feb 10 15:01:53 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 12:01:53 -0800
Subject: "Super()" confusion
In-Reply-To: <op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>

On 2/9/09, Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
> En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson
> <fetchinson at googlemail.com> escribi?:
>
>>>>>> Hello. I've been scouring the web looking for something to clear up a
>>>>>> little confusion about the use of "super()" but haven't found
>>>>>> anything
>>>>>> that really helps. Here's my simple example:
>>>>>>
>>>>>> [snip]
>>>>>>
>>>>>> "super(Child,self).__init__(filePath)
>>>>>> TypeError: super() argument 1 must be type, not classobj"
>>>>>>
>>>>>> What have I done wrong? Thanks in advance for any help.
>>>>>
>>>>> Consider whether you really need to use super().
>>>>>
>>>>> http://fuhm.net/super-harmful/
>>>>
>>>> Did you actually read that article, understood it, went through the
>>>> tons of responses from python-dev team members, including Guido
>>>
>>> Yes.  Why the knee-jerk reaction?
>>
>> Because throwing around that link carries about the same amount of
>> information as "perl is better than python", "my IDE is better than
>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>
> Not at all. It contains accurate and valuable information that isn't
> available elsewhere.

But does not contain other valuable information which would demystify
super. If only this source is shown to a person who wants to learn the
proper usage of super, the impression he/she gets will be distorted.

Example: 1. somebody asks about threading 2. reply comes: there is a
GIL! you can't do real threading. Now this reply might be technically
more-or-less correct, it is misleading and does not help the poster.
An informed discussion of the various solutions that does not involve
a rant about the GIL would be very useful though.

>>> I simply pointed out a resource which
>>> might be helpful to someone trying to learn to use super.
>>
>> It will certainly not be helpful to anyone trying to learn the usage
>> of super. The person who wrote that essay is simply misunderstanding
>> the concept, as has been explained countless times by the python dev
>> team. Hence, it only increases confusion, adds to the noise and
>> spreads false alarm.
>
> AFAIK, all facts appearing in said article are still true (except for 3.x
> which uses a shorter form). If super usage had been clearly documented in
> the first place, this had not happened.
> Perhaps you could point us to some resource explaining how is super
> supposed to be used correctly?
> And of those giving explanations in python-dev, nobody cared to add a
> single word to the Python documentation for years.

You might want to start with

http://www.artima.com/weblogs/viewpost.jsp?thread=236275

You are right, it's not in the documentation. But if somebody asks on
c.l.p the appropriate answer, I think, is to point to information such
as the one above, and not the misleading "harmful" essay.

>> Honestly, I don't understand how this thing got so much out of
>> control. If anyone starts an intelligent question or remark about
>> super, this essay is thrown in no matter what. Anyone can explain why?
>
> Because for a very loooooong time (seven years, 2001-2008) super was
> almost undocumented. The Library Reference -before release 2.6- only had a
> short paragraph, the online documentation referred (and still does) to the
> original essay by Guido introducing descriptors, which is inaccurate and
> outdated, and then the "... harmful" article was the only source of
> information available.
> Worse was the fate of packages and how they're imported: nobody "could be
> bothered to spell that out" (sic); or how import works in general, still
> barely documented (one has to dig into the PEP collection, trying to guess
> what parts are truly implemented and what parts are only a wish...)

You are right, the documentation needs some work in this regard. But
again, just because some sources are not in the documentation doesn't
mean that the most opinionated essay is the best source. A little
search turns up much more useful ones.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From fetchinson at googlemail.com  Tue Feb 10 15:03:18 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 12:03:18 -0800
Subject: "Super()" confusion
In-Reply-To: <pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<mailman.9191.1234229649.3487.python-list@python.org>
	<pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>
Message-ID: <fbe2e2100902101203s2042df18rd788802f5e47c0ab@mail.gmail.com>

>>>>> Consider whether you really need to use super().
>>>>>
>>>>> http://fuhm.net/super-harmful/
>>>>
>>>>Did you actually read that article, understood it, went through the
>>>>tons of responses from python-dev team members, including Guido
>
> "Tons" of responses?

This was mentioned already, but just to repeat: one good source, for
example, apart from the python-dev list:

http://www.artima.com/weblogs/viewpost.jsp?thread=236275

> I count 16, about a third of which are written by James Knight himself
> (the author of the page you are ranting against), and of the remaining,
> about half are low-to-zero information content, e.g. Tim Peter's joke
> about renaming the page for better marketing value.
>
> It's especially telling that even Guido, the most vocal critic of the
> article, is critical of the *title* but not the content. In his first
> post, he says: "I agree with the best practices in James's
> Conclusion...", and suggested that if the article was called "Multiple
> Inheritance Pitfalls in Python" he'd be much happier.
>
>
>>> Yes.  Why the knee-jerk reaction?
>>
>> Because throwing around that link carries about the same amount of
>> information as "perl is better than python", "my IDE is better than
>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>
> This is clearly not the case when even the most vocal critic agrees with
> the article's recommendations.
>
>
>>> I simply pointed out a resource which might be helpful to someone
>>> trying to learn to use super.
>>
>> It will certainly not be helpful to anyone trying to learn the usage of
>> super.
>
> I've read it, and found it very useful.
>
>
>> The person who wrote that essay is simply misunderstanding the
>> concept, as has been explained countless times by the python dev team.
>
> "Countless". Is that more or less than the "tons of responses" above?
>
>
>> Hence, it only increases confusion, adds to the noise and spreads false
>> alarm.
>
> So you say.
>
>
>> Honestly, I don't understand how this thing got so much out of control.
>> If anyone starts an intelligent question or remark about super, this
>> essay is thrown in no matter what. Anyone can explain why?
>
> Because inheritance is potentially confusing. Multiple inheritance is
> even more confusing. Multiple inheritance with diamond diagrams even more
> so, and multiple inheritance with diamond diagrams and non-cooperative
> classes are simply impossible to get right.
>
> Because there are many pitfalls to inheritance in Python, and they aren't
> obvious: who on earth would imagine that calling __init__ or __new__ with
> positional arguments could be dangerous? James Knight's article is a well-
> written, understandable description of some of them, in one place and
> with a catchy title. Of course people are going to link to it.
>
> And finally, because people do wrongly get the impression that using
> super will magically make those problems go away. I know this, because I
> was one of them.
>
> (I went through the anger period, sure that Knight must be full of it.
> How could anyone suggest that Guido made a super that isn't perfect? I
> got past that once I realised just how complex inheritance actually is.
> Currently I'm in denial, writing code with super and hoping that it will
> Just Work but not pushing it too hard in case it doesn't.)
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From robert.kern at gmail.com  Tue Feb 10 15:18:55 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 14:18:55 -0600
Subject: Logging in Python
In-Reply-To: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
Message-ID: <gmsnff$pqi$1@ger.gmane.org>

On 2009-02-10 11:50, aha wrote:
> Hello All,
>
> I have an application where logging may need to be configured in
> multiple places.  I've used the Python Logging Framework for sometime,
> but I'm still not sure how to test if logging has configured.  For
> example, I have modules A, B, and C.
>
> Below is some pseudo code...
> moduleA
>
> class A(object):
>    def __init__(self):
>      ...
>
> startLogging(config):
>    # Configure logging
>    # global logger
>    ...
>
> moduleB
> import moduleA
> from myconfig import MyConfig
> class B(object):
>    def __init__(self):
>      # self.config = MyConfig()
>      # if logging has started [HOW DO YOU DO THIS?]
>      #   self.logger = logging.getLogger("moduleB")
>      # else
>      #   self.logger = moduleA.startLogging(self.config)
>      # moduleA.startLogging
>      ...
>
> Where I need help is determining if a logger has already been
> configured.  Any advice?

I just do this in every module in which I'm doing logging:

   import logging
   logger = logging.getLogger(__name__)

I configure my logging only in my main() function(s).

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From martin at v.loewis.de  Tue Feb 10 15:19:28 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 10 Feb 2009 21:19:28 +0100
Subject: Python DLL's for C++?
In-Reply-To: <mailman.9251.1234294155.3487.python-list@python.org>
References: <mailman.9251.1234294155.3487.python-list@python.org>
Message-ID: <4991e150$0$30918$9b622d9e@news.freenet.de>

> Is it possible to write DLL's in Python for applications that only
> provide C++ interfaces?  Example: NotePad++ is extendible by writing C++
> DLL's which can call the NotePad++ interfaces.

Not directly, no. You have to write a C++ DLL which then can delegate
all calls to it to some Python function, and likewise expose Notepad++
API to Python.

> I wonder if those DLL's also can be written in Python, which in the end
> calls the C++ interfaces of NotePad++...

The actual logic can be in Python, but you do need a C++ wrapper module.

OTOH, if Notepad++ would also support COM/ActiveX plugins, then those
could directly be written in Python (assuming the COM interfaces
supported automation).

Regards,
Martin


From bkline at rksystems.com  Tue Feb 10 15:19:59 2009
From: bkline at rksystems.com (Bob Kline)
Date: Tue, 10 Feb 2009 15:19:59 -0500
Subject: Change in cgi module's handling of POST requests
Message-ID: <4991E16F.3010407@rksystems.com>

[Didn't realize the mirror didn't work both ways]

We just upgraded Python to 2.6 on some of our servers and a number of our CGI scripts broke because the cgi module has changed the way it handles POST requests.  When the 'action' attribute was not present in the form element on an HTML page the module behaved as if the value of the attribute was the URL which brought the user to the page with the form, but without the query (?x=y...) part.  Now FieldStorage.getvalue () is giving the script a list of two copies of the value for some of the parameters (folding in the parameters from the previous request) instead of the single string it used to return for each.  I searched this newsgroup looking for a discussion of the proposal to impose this change of behavior, and perhaps I wasn't using the right phrases in my search, but I didn't find anything.  I see that Perl still behaves the way pre-2.6 Python used to (not that I view that as a reason for anything).  We'll work around the breakage by explicitly setting the 'action' attribute everywhere, of course, but I usually see some discussion (often heated) of the impact of behavior changes on existing software when something like this is in the works.  Did I miss it?

I also noted that the module is making some deprecated use of the BaseException class.

Cheers.





From cosmo_general at yahoo.com  Tue Feb 10 15:21:19 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Tue, 10 Feb 2009 12:21:19 -0800 (PST)
Subject: How to get a return from Button?
Message-ID: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>

Hi Folks,

I want to use a Button to trigger askopenfilename() dialog, then I can
select a file. My short code is below:


def select_file():
	filenam = askopenfilename(title='Get the file:')
       return filenam

root = Tk()
Button(root, text='Select a file', command=select_file).pack()
root.mainloop()

My goal is to get the path of filenam, but the function select_file()
has nowhere to return what it selected. Can anybody help me out? I
consulted the book of Programming Python, but found no demo in this
regard. If the function has no return, command=blabla will work
nicely. I am lost in the scope.

Thanks!


Muddy Coder


From vinay_sajip at yahoo.co.uk  Tue Feb 10 15:21:42 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 10 Feb 2009 12:21:42 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
Message-ID: <e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com>

On Feb 10, 5:50 pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
>
> I have an application whereloggingmay need to be configured in
> multiple places.  I've used the PythonLoggingFramework for sometime,
> but I'm still not sure how to test iflogginghas configured.  For
> example, I have modules A, B, and C.
>
> Below is some pseudo code...
> moduleA
>
> class A(object):
>   def __init__(self):
>     ...
>
> startLogging(config):
>   # Configurelogging
>   # global logger
>   ...
>
> moduleB
> import moduleA
> from myconfig import MyConfig
> class B(object):
>   def __init__(self):
>     # self.config = MyConfig()
>     # iflogginghas started [HOW DO YOU DO THIS?]
>     #   self.logger =logging.getLogger("moduleB")
>     # else
>     #   self.logger = moduleA.startLogging(self.config)
>     # moduleA.startLogging
>     ...
>
> Where I need help is determining if a logger has already been
> configured.  Any advice?
>
> Aquil

It depends upon how complicated your logging requirements are. For
example, each module can have the following code in it:

import logging

logging.basicConfig(level=logging.DEBUG, filename="/tmp/myapp.log",
filemode="w") # An example

logger = logging.getLogger(__name__)

... your code, involving logger.debug(...) statements


basicConfig() attaches a FileLogger to the root logger, so all logging
output would be routed to the file "/tmp/myapp.log" in the example.
However, basicConfig() does nothing if the root logger already has
handlers, so calling it in each module shouldn't cause problems. It's
also nice to use the module name (__name__) as the logger name.

Another pattern is to configure logging in your main module, if there
is one, and then the other modules just assume logging is configured
and log away. If there isn't a main module, have all the modules
import a common module which, when imported, configures logging how
you want it. Under normal circumstances, the import code will only run
once, so your logging only gets configured the first time the module
gets imported by any of the others.

Regards,

Vinay Sajip


From aioe.org at technicalbloke.com  Tue Feb 10 15:28:00 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 15:28:00 -0500
Subject: Functional schmunctional...
Message-ID: <gmsnvi$ku$1@aioe.org>

I remember being forced to do a bit of functional programming in ML back
at Uni in the mid 90, the lecturers were all in a froth about it and I
must admit the code was elegant to look at. The problem was the dog slow
performance for anything half practical, especially with recursion being
the technique de jour. The HP workstations we were using were really
quite beefy for their time yet simple ML stuff would just murder the CPU
and RAM. Added to that, recursive stuff could be extremely confusing to
debug so I wrote it off as a nice idea in concept but a waste of my time
for anything practical.

So fast forward 15 years to this very afternoon... I needed a routine to
convert IP address strings to INET numbers and vice-versa and I remember
writing one a couple of years back when I first picked up Python. So I
went and dug it out.  Looking back at old code can be a bit dispiriting
though and this was no exception...

def inet2ip(n):
  p = (n/16777216)
  q = ((n-(p*16777216))/65536)
  r = ((n-((p*16777216)+(q*65536)))/256)
  s = ((n-((p*16777216)+(q*65536)+(r*256))))
  return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

def ip2in(a):
  li = a.split('.')
  assert len(li) == 4
  a = int(li[0])*16777216
  b = int(li[1])*65536
  c = int(li[2])*256
  d = int(li[3])
  return a+b+c+d


I thought "OMG, how naive and inelegant that looks, I can do far better
than that, after all I know things like list comprehensions and
map/reduce now!".  I had also noticed over the last year or two a lot of
chatter about functional programming especially in conjunction with python.

It seems to me that procedural programming has taken quite a kicking
against the more OO and functional methodologies over the last few years
and given my nothing-but-positive experience with OO of late I was
reconsidering the strength of my old opinions on FP. Maybe it was, as my
lecturers thought, the paradigm of the future and I was being a
crotchety old stick in the mud by spurning it as slow and confusing.

With this in mind I set about applying my hard won Python knowledge and
wisdom to the rewriting of these functions, not for any particularly
practical reasons, just to see what improvements I could wreak on them
several years down the line.

The IP string to INET number was first and I decided to throw list
comprehensions at it...

def ip2inet(a):
  li = a.split('.')
  assert len(li) == 4 or len(li) == 6
  return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
xrange(0,len(li))])

Now, that did made it completely unreadable but I thought, "it's pretty
much all one line now so I've gained some conciseness and at least it
should run a little faster". After all list comprehensions are often
fast aren't they? Well actually no, It runs at less than half the speed
of the previous function and now it's entirely lexically impenetrable.

Shit :-(

So far so bad... As inauspicious as these beginnings were I figured I'd
plug on anyway and try a functional approach to the INET number to IP
string function - the above experience having reinforced in me the
notion that clarity is paramount. Functional programming is all about
the clarity and elegance right?

I figured it might be worth trading a few cycles for at least,
especially as the machine I'm using here in 2009 has more RAM and CPU
grunt than whole Uni computer department did back in 1994. Not only that
I would only need to do 4 or 6 recursions in this algorithm and so I
shouldn't need to worry about the exponential inefficiency problems of
yore...

def inet2ip(n, l=[], c=4):
  if c==0: return ".".join(l)
  p = 256**( c-1 )
  l.append( str(n/p) )
  return inet2ip( n-(n/p)*p, l, c-1 )

The thing is, that's not really any clearer though is it?  I'd wager if
you didn't know already it would take you longer to figure out this
version than it would the original.  Still, "at least" I thought "it's
more concise than the last one and it scales to IPv6 far more
elegantly". I figured as long as the performance wasn't too lousy I
would keep it and so I quickly ran a little benchmark to see how much of
a performance hit I would be taking by doing so. The results for 10000
iterations of each were as follows...

0.113744974136 seconds for old INET->IP method
27.7441999912 seconds for new INET->IP method

:-/

FFS!

It just goes to show that...

1) Thinking you're a smart arse and actually being a smart arse are two
quite different things.

2) You should always take received wisdom with a good pinch of salt.

3) People aren't exaggerating when they say Python function calls are
expensive are they!


Roger Heathcote.


From clp2 at rebertia.com  Tue Feb 10 15:30:01 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 12:30:01 -0800
Subject: How to get a return from Button?
In-Reply-To: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>
References: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902101230s1d943a5co1811e2dae6bd48dd@mail.gmail.com>

On Tue, Feb 10, 2009 at 12:21 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I want to use a Button to trigger askopenfilename() dialog, then I can
> select a file. My short code is below:
>
>
> def select_file():
>        filenam = askopenfilename(title='Get the file:')
>       return filenam
>
> root = Tk()
> Button(root, text='Select a file', command=select_file).pack()
> root.mainloop()
>
> My goal is to get the path of filenam, but the function select_file()
> has nowhere to return what it selected. Can anybody help me out? I
> consulted the book of Programming Python, but found no demo in this
> regard. If the function has no return, command=blabla will work
> nicely. I am lost in the scope.

The function has nowhere to return its value to (except somewhere in
the innards of Tkinter, where it's discarded), so indeed it should
*not* return. You instead need to modify some program state to hold
the would-be return value.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From josh.dukes at microvu.com  Tue Feb 10 15:50:02 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 12:50:02 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <1234294770.8528.14.camel@localhost.localdomain>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
Message-ID: <20090210125002.1f6d8597@microvu.com>

> The first example is a list.  A list of length 0 evaluates to False.
> 
> The second example returns a generator object.  A generator object
> apparently evaluates to true.  Your example is not iterating of their
> values of the generator, but evaluating bool(generator_object) itself.
> My feeling is that bool(generator_object) is ambiguous so shouldn't be
> used to begin with.

I was actually aware of that (thank you, though, for trying to help).
What I was not clear on was if the boolean evaluation is a method of an
object that can be modified via operatior overloading (in the same way
+ is actually .__add__()) or not. Clearly __nonzero__ is the operator I
was curious about. Thanks for that info. 

> bool != has_values.  Check python.org for how Python determines the
> "truthiness" of an object. Generally speaking the following evaluate
> to False:
> 
>       * None 
>       * False 
>       * zero of any numeric type, for example, 0, 0L, 0.0, 0j. 
>       * any empty sequence, for example, '', (), []. 
>       * any empty mapping, for example, {}. 
>       * instances of user-defined classes, if the class defines a
>         __nonzero__() or __len__() method, when that method returns
> the integer zero or bool value False.
> 
> All other values are considered true -- so objects of many types are
> always true.

The thing I don't understand is why a generator that has no iterable
values is different from an empty list. Why shouldn't bool ==
has_value?? Technically a list, a tuple, and a string are also objects
but if they lack values they're evaluated as False. It seems to me that
a generator is an object that intends to replace lists where lazy
evaluation would be more efficent. Here is one place where that's
definitely true. 
The main reason I'm interested in this is that it improves performance
immensely over boolean evaluation of large lists (as the attached code
shows). It seems to me if I could use find a good use for it in my
experimentation that someone else might also want to do the same thing
in real-world code. 

Is there another list I should be asking these questions on?

-- 

Josh Dukes
MicroVu IT Department
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From http  Tue Feb 10 15:50:38 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 12:50:38 -0800
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <7xr626ow2p.fsf@ruckus.brouhaha.com>

r0g <aioe.org at technicalbloke.com> writes:
> def inet2ip(n):
>   p = (n/16777216)
>   q = ((n-(p*16777216))/65536)
>   r = ((n-((p*16777216)+(q*65536)))/256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

from struct import pack
def inet2ip(n):
  xs = pack('L',n)
  return '.'.join(str(ord(x)) for x in xs)


From namire at gmail.com  Tue Feb 10 15:54:14 2009
From: namire at gmail.com (namire)
Date: Tue, 10 Feb 2009 12:54:14 -0800 (PST)
Subject: Replace unknow string varible in file.
Message-ID: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>

Hey .python first time poster here. I'm pretty good with python so
far, but I keep needed a function in my program but not knowing how to
build it. =( Here's the problem:

Imagine a html file full of 100's of these strings all mooshed
together onto many lines;
<!--"@@MARKER@@; id=ITEM"-->ITEM<br>
Where the word 'MARKER' is a constant, it stay the same in each string
and the word 'ITEM' is a random combination of ascii characters of an
unknown length. So for example a:
<!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...

What I need to do it replace each instance of the random letter with a
constant and/or delete them. The file is a html file so the stuff
inside of <!-- --> is ok to keep and I need that data to identify
where the strings are in the file (it's full of other stuff too).  I'm
tired making a bruteforcer but with unknown length and 26 letters of
the alphabet I gave up because it would take too long (it was
something like; read file; if '@@MARKER@@; id="'+str(gen_string)+'"--
>"+sr(gen_string)+'<br>' in file then replace with '', but I'm
paraphrasing code and it's not the best solution anyway).

Just as a comparison in the Windows OS this seems easy to do when
managing files, say for the file a-blah-b-blah.tmp where blah is an
unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
python and a string in text file I don't have a clue. @_@ could
someone please help me?


From andrew at acooke.org  Tue Feb 10 15:54:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 17:54:51 -0300 (CLST)
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <a31b3b84713889e3155a703de02e0bf8.squirrel@localhost>

r0g wrote:
> def ip2inet(a):
>   li = a.split('.')
>   assert len(li) == 4 or len(li) == 6
>   return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
> xrange(0,len(li))])

what a mess.

i don't use this extreme a functional style in python (it's not really how
the language is intended to be used), but i think you can do better than
that.

how about:

from itertools import count

def ip2inet(a):
    blocks = a.split('.')
    assert len(blocks) in (4, 6)
    return sum(map(lambda (i, n): int(i) * 256**n,
                   zip(reversed(blocks), count(0))))

i haven't looked at the other function, but as a general comment it sounds
me like you are in such a hurry to point out fp is bad that you haven't
bothered to master it first.

andrew




From aioe.org at technicalbloke.com  Tue Feb 10 15:55:03 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 15:55:03 -0500
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
	<e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
Message-ID: <gmspi9$2p8$1@aioe.org>

J wrote:
> Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
> have a question:
> How far does Python go in the Game Development field? (Using Python
> only, no extensions)


Hey J,

Python's all about the libraries (extensions), you won't be able to do
much without them but that's no big whoop. AFAIK most python libs are
released under LGPL or BSD style licenses so there's pretty much no
restriction on what you can use them for. A lot of games are written in
C for performance reasons but most python gaming libs are just wrappers
round C gaming libs and share the same names and methods so your
knowledge should travel with you.

As for which libs to use...

There's PyGame which is a a good mature library for 2D stuff.

Pyglet seem to be the most popular OpenGL lib for 3D stuff.

You might also want to look at the "Blender Game Engine" and the free
game "Yo Frankie", they use C for the heavy lifting and Python for
scripting levels and stuff, it might be a good way to test the waters.

Regards,

Roger Heathcote.


From travis+ml-python at subspacefield.org  Tue Feb 10 15:57:39 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Tue, 10 Feb 2009 14:57:39 -0600
Subject: zlib interface semi-broken
Message-ID: <20090210205739.GT6522@subspacefield.org>

Hello all,

The zlib interface does not indicate when you've hit the end of a compressed stream.

The underlying zlib functionality provides for this.

With python's zlib, you have to read past the compressed data and into
the uncompressed, which gets stored in Decompress.unused_data.

As a result, if you've got a network protocol which mixes compressed
and non-compressed output, you may find a compressed block ending with
no uncompressed data following until you send another command -- which
a synchronous (non-pipelined) client will not send, because it is waiting
for the [compressed] data from the previous command to be finished.

As a result, you get a protocol deadlock.

A simple way to fix this would be to add a finished attribute to the
Decompress object.

However, perhaps this would be a good time to discuss how this library
works; it is somewhat awkward and perhaps there are other changes which
would make it cleaner.

What does the python community think?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From ntwrkd at gmail.com  Tue Feb 10 16:06:50 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 13:06:50 -0800
Subject: optparse versus getopt
Message-ID: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>

does anyone have any arguments against optparse vs getopt


From bmaschino at gmail.com  Tue Feb 10 16:14:02 2009
From: bmaschino at gmail.com (bmaschino at gmail.com)
Date: Tue, 10 Feb 2009 13:14:02 -0800 (PST)
Subject: pySerial help please!
Message-ID: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>

Hello all,

I am very new to Python and I am using it because I needed an easy
language to control a piece of equipment that connects to my computer
via a serial cable. I am running Python 2.6 with pySerial 2.4 under
Windows. I can get Python to create a serial port on COM1, but when I
try to write to the device, nothing happens. Here is an example:

import serial
ser = serial.Serial(0)
ser.write("otpm 2 16 0")
ser.close()

If I connect to the device in Hyperterminal the device will behave as
expected when I give it the command 'otpm 2 16 0' but not in Python. I
have confirmed Python is actually controlling the port because
Hyperterminal will not open the port while Python has it open,
although I have not been able to try a loopback connector as of yet.
Any suggestions out there? Thanks in advance!

Cheers,
Bryce


From robert.kern at gmail.com  Tue Feb 10 16:19:45 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 15:19:45 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
Message-ID: <gmsr1i$8vt$1@ger.gmane.org>

On 2009-02-10 15:06, Matthew Sacks wrote:
> does anyone have any arguments against optparse vs getopt

As the getopt docs say: "A more convenient, flexible, and powerful alternative 
is the optparse module."

I have found all three statements to be true.

But I've found argparse to be even better. The main reason is that argparse will 
help you parse, verify and generate help text for positional arguments in 
addition to --options.

   http://argparse.python-hosting.com/
   http://argparse.python-hosting.com/wiki/ArgparseVsOptparse

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Tue Feb 10 16:19:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 13:19:57 -0800
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <PcudnbUz2PWdcgzUnZ2dnUVZ_sninZ2d@pdx.net>

For expressiveness, try something like:

def ip2in(dotted_ip_addr):
     result = 0
     assert dotted_ip_addr.count('.') in (3, 7)
     for chunk in dotted_ip_addr.split('.'):
         result = (result << 8) + int(chunk)
     return result

def inet2ip(ip_number):
     assert 0 < ip_number < 1 << 48
     bytes = []
     while ip_number:
         bytes.append(ip_number & 255)
         ip_number >>= 8
     assert len(bytes) in (4, 6)
     return '.'.join(str(n) for n in reversed(bytes))

--Scott David Daniels
Scott.Daniels at Acm.Org


From vlastimil.brom at gmail.com  Tue Feb 10 16:22:37 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 10 Feb 2009 22:22:37 +0100
Subject: Replace unknow string varible in file.
In-Reply-To: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <9fdb569a0902101322y60a6410bs67d513877dad0f06@mail.gmail.com>

2009/2/10 namire <namire at gmail.com>:
> Hey .python first time poster here. I'm pretty good with python so
> far, but I keep needed a function in my program but not knowing how to
> build it. =( Here's the problem:
>
> Imagine a html file full of 100's of these strings all mooshed
> together onto many lines;
> <!--"@@MARKER@@; id=ITEM"-->ITEM<br>
> Where the word 'MARKER' is a constant, it stay the same in each string
> and the word 'ITEM' is a random combination of ascii characters of an
> unknown length. So for example a:
> <!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
> h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...
>
> What I need to do it replace each instance of the random letter with a
> constant and/or delete them.
>...
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Hi,
It is not quite clear to me, what should be achieved with the given
file, but an example with wildcard characters in windows implies, that
the regular expressions can be of some use here (given the file is as
regular as the samples, especially without nesting the comments etc.)

the segments in examples can be matched eg. with the expression>:

<!--"@@MARKER@@; id=([^"]+)"-->\1<br>

the ITEM, CATFISH, SPAM ... elements are captured in the parethesised
group and can be used foe matching or replacing.

check the re module in the python library:
http://docs.python.org/library/re.html

hth
 vbr


From marduk at letterboxes.org  Tue Feb 10 16:25:47 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 10 Feb 2009 16:25:47 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210125002.1f6d8597@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
Message-ID: <1234301147.8528.47.camel@localhost.localdomain>

On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:

> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list. Why shouldn't bool ==
> has_value?? Technically a list, a tuple, and a string are also objects
> but if they lack values they're evaluated as False. It seems to me that
> a generator is an object that intends to replace lists where lazy
> evaluation would be more efficent. Here is one place where that's
> definitely true. 

Well, I did not implement generators in python, but my guess would be
that lists and tuples can be checked with len() to see if it is
non-empty.  Generators don't have length.  You would at least need to
call .next() which "changes" the generator so every time you'd want to
evaluate the boolean of the generator you'd potentially lose the next
item.

Generators are meant to replace lists where you don't want/can't put the
entire "list" in memory or for which there is no (known) end to the
list. You don't know the next value a generator will return (if any)
until you evaluate it.  Don't think of generators as containers like
lists, tuples and strings are.  Generators don't "contain" values.
Generators are objects that return the "next" value.  It has no idea how
many values it contains (it's not a container).  It only knows the
".next()" value when it's called.  It forgets the value once it's
returned. And it has no idea how far it is in the iteration until it's
finished (StopIteration).

> The main reason I'm interested in this is that it improves performance
> immensely over boolean evaluation of large lists (as the attached code
> shows). It seems to me if I could use find a good use for it in my
> experimentation that someone else might also want to do the same thing
> in real-world code. 

I don't understand what you mean by this.  But if you really want to
know if a generator is "non-empty":

def non_empty(virgin_generator):
    try:
        virgin_generator.next() # note you just lost the first value
        return True
    except StopIteration:
        return False

The only way to get around this is to put all the values of a generator
inside a container (e.g. a list):

l = list(generator_object)

but in doing so you've (obviously) lost the advantages of the generator.


> Is there another list I should be asking these questions on?

I don't know. Sorry I wasn't able to help you.

-a




From Scott.Daniels at Acm.Org  Tue Feb 10 16:36:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 13:36:21 -0800
Subject: zlib interface semi-broken
In-Reply-To: <mailman.9266.1234299464.3487.python-list@python.org>
References: <mailman.9266.1234299464.3487.python-list@python.org>
Message-ID: <hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>

Travis wrote:
> The zlib interface does not indicate when you've hit the
 > end of a compressed stream....
> The underlying zlib functionality provides for this.
> 
> With python's zlib, you have to read past the compressed data and into
> the uncompressed, which gets stored in Decompress.unused_data.
> ... [good explanation of why this is problematic] ...
> A simple way to fix this would be to add a finished attribute to the
> Decompress object.
Perhaps you could submit a patch with such a change?

> However, perhaps this would be a good time to discuss how this library
> works; it is somewhat awkward and perhaps there are other changes which
> would make it cleaner.
Well, it might be improvable, I haven't really looked.  I personally
would like it and bz2 to get closer to each other in interface, rather
than to spread out.  SO if you are really opening up a can of worms,
I vote for two cans.

--Scott David Daniels
Scott.Daniels at Acm.Org





From aquil.abdullah at gmail.com  Tue Feb 10 16:38:19 2009
From: aquil.abdullah at gmail.com (aha)
Date: Tue, 10 Feb 2009 13:38:19 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
	<e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com>
Message-ID: <cf33e272-1c35-4496-ab98-853a06fceab8@z1g2000yqn.googlegroups.com>

Thanks for your suggestions.  I've also figured that I can test if
logging.RootLogger.manager.loggerDict has any items in it.  Or if it
has a logger for the module that I wish to start.  I like basicLogger
idea though as it seems like the cleanest implementation.

On Feb 10, 3:21?pm, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On Feb 10, 5:50 pm, aha <aquil.abdul... at gmail.com> wrote:
>
>
>
> > Hello All,
>
> > I have an application whereloggingmay need to be configured in
> > multiple places. ?I've used the PythonLoggingFramework for sometime,
> > but I'm still not sure how to test iflogginghas configured. ?For
> > example, I have modules A, B, and C.
>
> > Below is some pseudo code...
> > moduleA
>
> > class A(object):
> > ? def __init__(self):
> > ? ? ...
>
> > startLogging(config):
> > ? # Configurelogging
> > ? # global logger
> > ? ...
>
> > moduleB
> > import moduleA
> > from myconfig import MyConfig
> > class B(object):
> > ? def __init__(self):
> > ? ? # self.config = MyConfig()
> > ? ? # iflogginghas started [HOW DO YOU DO THIS?]
> > ? ? # ? self.logger =logging.getLogger("moduleB")
> > ? ? # else
> > ? ? # ? self.logger = moduleA.startLogging(self.config)
> > ? ? # moduleA.startLogging
> > ? ? ...
>
> > Where I need help is determining if a logger has already been
> > configured. ?Any advice?
>
> > Aquil
>
> It depends upon how complicated your logging requirements are. For
> example, each module can have the following code in it:
>
> import logging
>
> logging.basicConfig(level=logging.DEBUG, filename="/tmp/myapp.log",
> filemode="w") # An example
>
> logger = logging.getLogger(__name__)
>
> ... your code, involving logger.debug(...) statements
>
> basicConfig() attaches a FileLogger to the root logger, so all logging
> output would be routed to the file "/tmp/myapp.log" in the example.
> However, basicConfig() does nothing if the root logger already has
> handlers, so calling it in each module shouldn't cause problems. It's
> also nice to use the module name (__name__) as the logger name.
>
> Another pattern is to configure logging in your main module, if there
> is one, and then the other modules just assume logging is configured
> and log away. If there isn't a main module, have all the modules
> import a common module which, when imported, configures logging how
> you want it. Under normal circumstances, the import code will only run
> once, so your logging only gets configured the first time the module
> gets imported by any of the others.
>
> Regards,
>
> Vinay Sajip



From python.list at tim.thechases.com  Tue Feb 10 16:38:35 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 10 Feb 2009 15:38:35 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
Message-ID: <4991F3DB.5000802@tim.thechases.com>

Matthew Sacks wrote:
> does anyone have any arguments against optparse vs getopt

I've found that the optparse module beats getopt on *every* 
aspect except in the event that you have experience with the C 
getopt libraries *and* just want something that behaves like 
those libraries.  Optparse is easy to learn, easy to read, and 
part of the Python stdlib.

-tkc






From ntwrkd at gmail.com  Tue Feb 10 16:42:38 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 13:42:38 -0800
Subject: optparse versus getopt
In-Reply-To: <4991F3DB.5000802@tim.thechases.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
Message-ID: <f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>

it seems as if optparse isn't in my standard library.
is there a way to add a lib like ruby gems?

On Tue, Feb 10, 2009 at 1:38 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
> Matthew Sacks wrote:
>>
>> does anyone have any arguments against optparse vs getopt
>
> I've found that the optparse module beats getopt on *every* aspect except in
> the event that you have experience with the C getopt libraries *and* just
> want something that behaves like those libraries.  Optparse is easy to
> learn, easy to read, and part of the Python stdlib.
>
> -tkc
>
>
>
>
>


From bkaplan1 at gmail.com  Tue Feb 10 16:44:37 2009
From: bkaplan1 at gmail.com (Brian Kaplan)
Date: Tue, 10 Feb 2009 16:44:37 -0500
Subject: Cannot get python to read a CAP file link in an ATOM feed
Message-ID: <efa461e10902101344m27664381i551bcd32c2cca6fa@mail.gmail.com>

Hi List,
I'm trying to get python to parse a CAP file in an ATOM feed from the
National Weather Service.  Here's one states ATOM feed.
http://www.weather.gov/alerts-beta/ky.php?x=0.  If you view the source
of this file, there is a reference to another web feed. For instance,
href="http://www.weather.gov/alerts-beta/wwacapget.php?x=KY20090210210200ILNNPWILNHighWindWarning20090212100000KY"
(note, this latter file changes hourly).  I can retrieve and parse the
first file but cannot get the second file read or parsed as an xml. I
am able to read it into memory using urlopen.  Can python read and
parse as an xml or do I need to read it into memory.  If it is in
memory, is there a similar parsing function.  Thanks  Brian Kaplan


From space.captain.face at gmail.com  Tue Feb 10 16:46:20 2009
From: space.captain.face at gmail.com (Kalibr)
Date: Tue, 10 Feb 2009 13:46:20 -0800 (PST)
Subject: Using TK and the canvas.
References: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>
	<41c83165-d6ec-429f-ac27-7d103e0d2d2b@u13g2000yqg.googlegroups.com>
Message-ID: <06c439f8-e010-4709-9f4d-890977ac7558@w24g2000prd.googlegroups.com>

On Feb 11, 5:51?am, r <rt8... at gmail.com> wrote:
> On Feb 10, 1:27?pm, Kalibr <space.captain.f... at gmail.com> wrote:
> [snip]
>
> You should really check out wxPython, there is support for just this
> type of thing. of course you could do this with Tkinter, but just
> thinking about it makes my head hurt :).

Alright, I shall investigate. Thank you.


From robert.kern at gmail.com  Tue Feb 10 16:48:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 15:48:04 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
Message-ID: <gmssmk$eai$1@ger.gmane.org>

On 2009-02-10 15:42, Matthew Sacks wrote:
> it seems as if optparse isn't in my standard library.

How did you install your Python? It has been part of the standard library for a 
very long time.

> is there a way to add a lib like ruby gems?

http://docs.python.org/install/index.html

But optparse (named Optik when it was a separate package) has not been 
distributed separately from Python for a long time.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From http  Tue Feb 10 16:51:58 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 13:51:58 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
Message-ID: <7x63jiez9d.fsf@ruckus.brouhaha.com>

Travis <travis+ml-python at subspacefield.org> writes:
> However, perhaps this would be a good time to discuss how this library
> works; it is somewhat awkward and perhaps there are other changes which
> would make it cleaner.
> 
> What does the python community think?

It is missing some other features too, like the ability to preload
a dictionary.  I'd support extending the interface.  


From bearophileHUGS at lycos.com  Tue Feb 10 16:52:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 10 Feb 2009 13:52:11 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>

Here a small benchmark:

def ip2inet01(a): # can't be used with 6
    li = a.split('.')
    assert len(li) == 4
    a = int(li[0])*16777216
    b = int(li[1])*65536
    c = int(li[2])*256
    d = int(li[3])
    return a+b+c+d

from itertools import count

def ip2inet02(a):
    blocks = a.split('.')
    assert len(blocks) in (4, 6)
    return sum(map(lambda (i, n): int(i) * 256**n, zip(reversed
(blocks), count(0))))

def ip2inet03(iptxt):
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by * 256**po for po, by in enumerate(bytes))

def ip2inet04(iptxt):
    bytes = map(int, reversed(iptxt.strip().split(".")))
    assert len(bytes) in (4, 6)
    powers256 = [1, 256, 65536, 16777216, 4294967296, 1099511627776]
    return sum(by * powers256[po] for po, by in enumerate(bytes))

def ip2inet05(iptxt):
    bytes = (int(by) for by in reversed(iptxt.strip().split(".")))
    parts = [by * ip2inet05.powers256[po] for po, by in enumerate
(bytes)]
    assert len(parts) in (4, 6)
    return sum(parts)
ip2inet05.powers256 = [1, 256, 65536, 16777216, 4294967296,
1099511627776]

def ip2inet06(a):
    li = a.split('.')
    n = len(li)
    assert n == 4 or n == 6
    if n == 4:
        return (int(li[0]) * 16777216 +
                 int(li[1]) * 65536 +
                 int(li[2]) * 256 +
                 int(li[3]))
    else:
        return (int(li[0]) * 1099511627776 +
                 int(li[1]) * 4294967296 +
                 int(li[2]) * 16777216 +
                 int(li[3]) * 65536 +
                 int(li[4]) * 256 +
                 int(li[5]))

def ip2inet07(iptxt):
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by * ip2inet07.pows[po] for po, by in enumerate(bytes))
ip2inet07.pows = [1, 256, 65536, 16777216, 4294967296, 1099511627776]

from struct import pack
def ip2inet08(n): # error
  xs = pack('L', n)
  return '.'.join(str(ord(x)) for x in xs)

def ip2inet09(iptxt): # short and readable
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by << (8*po) for po, by in enumerate(bytes))

def ip2inet10(iptxt):
    count = 0
    result = 0
    for byte in iptxt.strip().split("."):
        result <<= 8
        result += int(byte)
        count += 1
    assert count in (4, 6)
    return result

def ip2inet11(iptxt):
    bytes = iptxt.strip().split(".")
    assert len(bytes) in (4, 6)
    result = 0
    for byte in bytes:
        result <<= 8
        result += int(byte)
    return result

def ip2inet12(iptxt):
    bytes = iptxt.strip().split(".")
    assert len(bytes) in (4, 6)
    result = 0
    for byte in bytes:
        result = (result << 8) + int(byte)
    return result

def ip2inet13(a): # fastest and readable
    li = a.split('.')
    n = len(li)
    assert n == 4 or n == 6
    if n == 4:
        return ((int(li[0]) << 24) +
                 (int(li[1]) << 16) +
                 (int(li[2]) << 8) +
                 int(li[3]))
    else:
        return ((int(li[0]) << 40) +
                 (int(li[1]) << 32) +
                 (int(li[2]) << 24) +
                 (int(li[3]) << 16) +
                 (int(li[4]) << 8) +
                 int(li[5]))



def main():
    from timeit import default_timer as clock

    ip4 = "155.16.187.87"
    ip6 = "7.155.16.187.87.255"
    algos = [ip2inet02, ip2inet03, ip2inet04, ip2inet05, ip2inet06,
             ip2inet07, ip2inet09, ip2inet10, ip2inet11, ip2inet12,
             ip2inet13]
    for algo in algos:
        assert algo(ip4) == 2601565015 and algo(ip6) == 8362582038527
        t0 = clock()
        for i in xrange(10000):
            algo(ip4)
            algo(ip6)
        print algo.__name__, round(clock() - t0, 2), "s"

    import psyco; psyco.full()
    print "With Psyco:"
    for algo in algos:
        t0 = clock()
        for i in xrange(10000):
            algo(ip4)
            algo(ip6)
        print algo.__name__, round(clock() - t0, 2), "s"


main()

ip2inet02 2.68 s
ip2inet03 1.79 s
ip2inet04 1.72 s
ip2inet05 1.88 s
ip2inet06 0.98 s
ip2inet07 1.57 s
ip2inet09 1.5 s
ip2inet10 1.07 s
ip2inet11 1.07 s
ip2inet12 1.03 s
ip2inet13 0.95 s

With Psyco (indipendent run! Not normally successive):
ip2inet02 2.66 s
ip2inet03 1.66 s
ip2inet04 1.97 s
ip2inet05 1.66 s
ip2inet06 0.57 s
ip2inet07 1.5 s
ip2inet09 1.54 s
ip2inet10 0.53 s
ip2inet11 0.76 s
ip2inet12 0.52 s
ip2inet13 0.8 s

So if you need speed you the version #13 is better, if you want short
and readable code (but not too much slow) you can use #9, and if you
want code easy to understand by every one and easy to translate to
other languages then you can use #12.

Bye,
bearophile


From aleksandr.goretoy at gmail.com  Tue Feb 10 16:53:26 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Tue, 10 Feb 2009 15:53:26 -0600
Subject: GAE read binary file into db.BlobProperty()
In-Reply-To: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>
References: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>
Message-ID: <fa98a9e30902101353xec45cd1w82fc2e55d73446a8@mail.gmail.com>

was not able to use open to open a binary file.... so what I did was use
urlfetch to fetch the image for me and read the content into BlobProperty()
Not sure why it took me so long to figure this out. Hope it helps someone.
thx

  def post(self,key):
    k=db.get(key)
      img=images.Image(urlfetch.Fetch("http://www.example.com/
"+k.image).content)
      img.rotate(90)
      jpg_data= img.execute_transforms(images.JPEG)
      k.image_blob=jpg_data
      k.put()

-Alex Goretoy
http://www.goretoy.com



On Mon, Feb 9, 2009 at 11:07 AM, alex goretoy
<aleksandr.goretoy at gmail.com>wrote:

> How to read Binary file into GAE(Google App Engine) db.BlobProperty()
> datastore?
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
-------------- next part --------------
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From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 16:57:56 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 21:57:56 GMT
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:

> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list.

How do you know it has no iterable values until you call next() on it and 
get StopIteration?

By the way, your "has_values" function is just a slower version of the 
built-in any().


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 16:58:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 21:58:36 GMT
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:43:20 +0000, Lie Ryan wrote:

> Of course multi-core processor can improve single function using
> multiprocessing, as long as the function is parallelizable. The
> Fibonacci function is not a parallelizable function though.

As I understand it, there's very little benefit to multi-cores in Python 
due to the GIL. 


-- 
Steven.


From aioe.org at technicalbloke.com  Tue Feb 10 17:00:44 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 17:00:44 -0500
Subject: Replace unknow string varible in file.
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <gmstde$7ka$1@aioe.org>

namire wrote:
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?

Hi Namire,

The equivalent thing in programming languages is "Regular Expressions",
also known as "regex". It's like a small pattern matching sub-language.

There quite a lot more to it than the odd "*" so it might take a bit of
googling around and study to really understand it but the principle is
the same.

In python you need to import the 're' module.

Have a look at this, the replace method is called 'sub'...

http://www.amk.ca/python/howto/regex/regex.html

Take your time with it though, it can be confusing until you get used to
it and when you're building an expression don't try and do it all at
once, start small and build it up a little at a time.

Roger Heathcote.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:01:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:01:29 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<01a16bc0$0$20660$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.22.01.29@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 22:41:25 +1000, Gerhard Weis wrote:

> btw. the timeings are not that different for the naive recursion in OP's
> version and yours.
> fib(500) on my machine:
> 	OP's: 0.00116 (far away from millions of years) 
> This here: 0.000583

I don't believe those timings are credible. On my machine, it took a 
minute to calculate fib(38), and while my machine isn't exactly the 
fastest box possible, nor is it especially slow.

I don't wish to imply that you are deliberately lying, but your result of 
0.00116 seconds for the naive version of fib(500) is so unrealistic in my 
experience that I believe you must be confused. Perhaps you've timed a 
less naive fib() but thought it was the naive version.

Unless somebody can point out an error in my analysis, I'm sticking to my 
earlier claim that the naive version of fib(500) requires an unbelievably 
huge number of function calls: significantly more than the value of fib
(500) itself. See my earlier post in this thread for details.



-- 
Steven


From tjreedy at udel.edu  Tue Feb 10 17:02:44 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:02:44 -0500
Subject: generator object or 'send' method?
In-Reply-To: <dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>	<mailman.9202.1234243720.3487.python-list@python.org>	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
	<mailman.9219.1234269022.3487.python-list@python.org>
	<dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>
Message-ID: <gmsti0$i1c$1@ger.gmane.org>

Aaron Brady wrote:

> I guess a generator that counts, but skips K numbers, where K can be
> varied.  For instance, you initialize it with N, the starting number,
> and K, the jump size.  Then, you can change either one later on.

This specification is incomplete as to the timing of when changes to N 
take effect and when variable K is applied.

> This gets two birds with one stone, but is it possible?

If you write an iterator class instead of trying to stretch the 
abbreviated form beyond its intention, and the specification is 
coherent, it should be trivial.



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:02:57 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:02:57 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
Message-ID: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:06:06 +0000, Duncan Booth wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 
>> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>> 
>>> How would I do separate lines into words without scanning one
>>> character at a time?
>> 
>> Scan a line at a time, then split each line into words.
>> 
>> 
>> for line in open('myfile.txt'):
>>     words = line.split()
>> 
>> 
>> should work for a particularly simple-minded idea of words.
>> 
> Or for a slightly less simple minded splitting you could try re.split:
> 
>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']


Perhaps I'm missing something, but the above regex does the exact same 
thing as line.split() except it is significantly slower and harder to 
read.

Neither deal with quoted text, apostrophes, hyphens, punctuation or any 
other details of real-world text. That's what I mean by "simple-minded".


-- 
Steven


From clp2 at rebertia.com  Tue Feb 10 17:05:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 14:05:19 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
	<pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0902101405w70c08991o85fabf5f08dabebf@mail.gmail.com>

On Tue, Feb 10, 2009 at 1:57 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:
>
>> The thing I don't understand is why a generator that has no iterable
>> values is different from an empty list.
>
> How do you know it has no iterable values until you call next() on it and
> get StopIteration?
>
> By the way, your "has_values" function is just a slower version of the
> built-in any().

<nitpick>
Not quite: if the generator produces one or more elements but those
elements happen to be boolean false according to Python, then any()
will be false but has_values() will be true. The functions serve
different purposes (produces at least 1 value vs. has at least one
true value).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From josh.dukes at microvu.com  Tue Feb 10 17:09:48 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 14:09:48 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
	<pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <20090210140948.6a362143@microvu.com>

ahhh any! ok, yeah, I guess that's what I was looking for. Thanks.


On 10 Feb 2009 21:57:56 GMT
Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:
> 
> > The thing I don't understand is why a generator that has no iterable
> > values is different from an empty list.
> 
> How do you know it has no iterable values until you call next() on it
> and get StopIteration?
> 
> By the way, your "has_values" function is just a slower version of
> the built-in any().
> 
> 


-- 

Josh Dukes
MicroVu IT Department


From vinay_sajip at yahoo.co.uk  Tue Feb 10 17:21:03 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 10 Feb 2009 14:21:03 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
	<e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com> 
	<cf33e272-1c35-4496-ab98-853a06fceab8@z1g2000yqn.googlegroups.com>
Message-ID: <fe0b8c32-1cb6-4bed-899b-c36fc616bdf1@l1g2000yqj.googlegroups.com>

On Feb 10, 9:38 pm, aha <aquil.abdul... at gmail.com> wrote:
> Thanks for your suggestions.  I've also figured that I can test iflogging.RootLogger.manager.loggerDict has any items in it.  Or if it
> has a logger for the module that I wish to start.  I like basicLogger
> idea though as it seems like the cleanest implementation.
>

It's best not to dig into the implementation details, as these might
change across versions of Python. Any of the suggestions that Robert
and I made should be able to solve your problem in the right way.

Best regards,

Vinay Sajip


From kp8 at mac.com  Tue Feb 10 17:22:35 2009
From: kp8 at mac.com (kpp9c)
Date: Tue, 10 Feb 2009 14:22:35 -0800 (PST)
Subject: Python Launcher.app on OS X
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
	<ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com> 
	<mailman.9243.1234285389.3487.python-list@python.org>
Message-ID: <3e505dfe-7df5-4ace-87c8-1eab7d451ea7@u13g2000yqg.googlegroups.com>

So how does this effect the install instructions found on the link:

http://wiki.python.org/moin/MacPython/Leopard

do you trash that when you do an install on OS X? I am so hesitant to
delete anything that resides in /System





From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:26:39 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:26:39 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 02:05:35 -0800, Niklas Norrthon wrote:

> According to the common definition of fibonacci numbers fib(0) = 0, fib
> (1) = 1 and fib(n) = fib(n-1) + fib(n-2) for n > 1. So the number above
> is fib(501).

So it is. Oops, off by one error!

Or, if you prefer, it's the right algorithm for a Lucas sequence with 
first two values 1 and 1 instead of 0 and 1. :)



>>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
>>
>> 0.00083398818969726562
> 
> And now for my version (which admitedly isn't really mine, and returns
> slightly incorrect fib(n) for large values of n, due to the limited
> floating point precision).

The floating point version is nice, but it starts giving incorrect 
answers relatively early, from n=71. But if you don't need accurate 
results (a relative error of 3e-15 for n=71), it is very fast.



-- 
Steven


From tjreedy at udel.edu  Tue Feb 10 17:29:23 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:29:23 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210125002.1f6d8597@microvu.com>
References: <20090210111514.07e0480a@microvu.com>	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
Message-ID: <gmsv40$ni3$1@ger.gmane.org>

Josh Dukes wrote:

> 
> I was actually aware of that (thank you, though, for trying to help).
> What I was not clear on was if the boolean evaluation is a method of an
> object that can be modified via operatior overloading (in the same way
> + is actually .__add__()) or not. Clearly __nonzero__ is the operator I
> was curious about. Thanks for that info. 

.__bool__ in 3.0.


> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list. Why shouldn't bool ==
> has_value?? Technically a list, a tuple, and a string are also objects
> but if they lack values they're evaluated as False. It seems to me that
> a generator is an object that intends to replace lists where lazy
> evaluation would be more efficent. Here is one place where that's
> definitely true. 

Generator functions are abbreviated iterator classes.  If you want 
iterators with more functionality, write an iterator class.  In 
particular, you can add a .__bool__ method for empty or not or even a 
.__len__ method if you can accurately calculate the number of items 
remaining.

> The main reason I'm interested in this is that it improves performance
> immensely over boolean evaluation of large lists (as the attached code
> shows). It seems to me if I could use find a good use for it in my
> experimentation that someone else might also want to do the same thing
> in real-world code. 

Terry Jan Reedy



From tdelaney at avaya.com  Tue Feb 10 17:31:33 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Wed, 11 Feb 2009 06:31:33 +0800
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <1732ba01-6096-4d38-a09d-fe1fbe75b435@l1g2000yqj.googlegroups.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01111E65@301081ANEX2.global.avaya.com>

bearophileHUGS at lycos.com wrote:

> Paul Rubin:
>> Gideon Smeding of the University of
>> Utrecht has written a masters' thesis titled "An executable
>> operational semantics for Python".
> 
> A significant part of Computer Science is a waste of time and money.

The same can be said for any research. Can you predict ahead of time
which research will be useful, and which won't? If so (and you can prove
it) why aren't you making unbelievable amounts of money?

Tim Delaney


From gweis at gmx.at  Tue Feb 10 17:31:46 2009
From: gweis at gmx.at (Gerhard Weis)
Date: Wed, 11 Feb 2009 08:31:46 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<01a16bc0$0$20660$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.22.01.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a1f61a$0$21875$c3e8da3@news.astraweb.com>

On 2009-02-11 08:01:29 +1000, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Tue, 10 Feb 2009 22:41:25 +1000, Gerhard Weis wrote:
> 
>> btw. the timeings are not that different for the naive recursion in OP's
>> version and yours.
>> fib(500) on my machine:
>> 	OP's: 0.00116 (far away from millions of years)
>> This here: 0.000583
> 
> I don't believe those timings are credible. On my machine, it took a
> minute to calculate fib(38), and while my machine isn't exactly the
> fastest box possible, nor is it especially slow.
> 
> I don't wish to imply that you are deliberately lying, but your result of
> 0.00116 seconds for the naive version of fib(500) is so unrealistic in my
> experience that I believe you must be confused. Perhaps you've timed a
> less naive fib() but thought it was the naive version.
> 
> Unless somebody can point out an error in my analysis, I'm sticking to my
> earlier claim that the naive version of fib(500) requires an unbelievably
> huge number of function calls: significantly more than the value of fib
> (500) itself. See my earlier post in this thread for details.

I am sorry for the wrong timing, I mixed up the function names. The 
naive version used partly your version and partly the naive recursion. 
So less naive is a good description :)

after fixing it:
naive fib(38): ~40seconds



From tjreedy at udel.edu  Tue Feb 10 17:33:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:33:06 -0500
Subject: Working with propositional formulae in Python
In-Reply-To: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>
References: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>
Message-ID: <gmsvau$ni3$2@ger.gmane.org>

nnp wrote:
> Hey,
> 
> I'm currently working with propositional boolean formulae of the type
> 'A & (b -> c)' (for example). I was wondering if anybody knows of a
> Python library to create parse trees and convert such formulae to
> conjunctive, disjunctive and Tseitin normal forms?

You would probably do better with Google.
"Python conjunctive normal form"
gave some potentially interesting hits.



From Scott.Daniels at Acm.Org  Tue Feb 10 17:33:35 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 14:33:35 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7x63jiez9d.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
Message-ID: <8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>

Paul Rubin wrote:
> Travis <travis+ml-python at subspacefield.org> writes:
>> However, perhaps this would be a good time to discuss how [zlib] works...
> It is missing some other features too, like the ability to preload
> a dictionary.  I'd support extending the interface.

The trick to defining a preload interface is avoiding creating a brittle
interface -- the saved preload should be usable across machines and
versions.  I suspect that is why such an interface never came up (If
you can clone states, then you can say: "compress this, then use the
resultant state to compress/decompress others."  Suddenly there is no
nasty problem guessing what to parameterize and what to fix in stone.


--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Tue Feb 10 17:39:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 10 Feb 2009 22:39:48 +0000
Subject: pySerial help please!
In-Reply-To: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <49920234.90009@mrabarnett.plus.com>

bmaschino at gmail.com wrote:
> Hello all,
> 
> I am very new to Python and I am using it because I needed an easy
> language to control a piece of equipment that connects to my computer
> via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> Windows. I can get Python to create a serial port on COM1, but when I
> try to write to the device, nothing happens. Here is an example:
> 
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()
> 
> If I connect to the device in Hyperterminal the device will behave as
> expected when I give it the command 'otpm 2 16 0' but not in Python. I
> have confirmed Python is actually controlling the port because
> Hyperterminal will not open the port while Python has it open,
> although I have not been able to try a loopback connector as of yet.
> Any suggestions out there? Thanks in advance!
> 
Have you checked that the baud rate, parity, etc, are the same as in
Hyperterminal?


From deets at nospam.web.de  Tue Feb 10 17:41:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 10 Feb 2009 23:41:09 +0100
Subject: pySerial help please!
In-Reply-To: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <6vee48FjmnodU1@mid.uni-berlin.de>

bmaschino at gmail.com schrieb:
> Hello all,
> 
> I am very new to Python and I am using it because I needed an easy
> language to control a piece of equipment that connects to my computer
> via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> Windows. I can get Python to create a serial port on COM1, but when I
> try to write to the device, nothing happens. Here is an example:
> 
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()
> 
> If I connect to the device in Hyperterminal the device will behave as
> expected when I give it the command 'otpm 2 16 0' but not in Python. I
> have confirmed Python is actually controlling the port because
> Hyperterminal will not open the port while Python has it open,
> although I have not been able to try a loopback connector as of yet.
> Any suggestions out there? Thanks in advance!

You need to give a newline, you press return on the terminal as well, 
don't you?

Diez


From python.list at tim.thechases.com  Tue Feb 10 17:46:30 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 10 Feb 2009 16:46:30 -0600
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
Message-ID: <499203C6.9070501@tim.thechases.com>

>> Or for a slightly less simple minded splitting you could try re.split:
>>
>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> 
> 
> Perhaps I'm missing something, but the above regex does the exact same 
> thing as line.split() except it is significantly slower and harder to 
> read.
> 
> Neither deal with quoted text, apostrophes, hyphens, punctuation or any 
> other details of real-world text. That's what I mean by "simple-minded".

   >>> s = "The quick brown fox jumps, and falls over."
   >>> import re
   >>> re.split(r"(\w+)", s)[1::2]
   ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
   >>> s.split()
   ['The', 'quick', 'brown', 'fox', 'jumps,', 'and', 'falls', 
'over.']

Note the difference in "jumps" vs. "jumps,"  (extra comma in the 
string.split() version) and likewise the period after "over". 
Thus not quite "the exact same thing as line.split()".

I think an easier-to-read variant would be

   >>> re.findall(r"\w+", s)
   ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']

which just finds words.  One could also just limit it to letters with

   re.findall("[a-zA-Z]", s)

as "\w" is a little more encompassing (letters and underscores) 
if that's a problem.

-tkc






From rhodri at wildebst.demon.co.uk  Tue Feb 10 17:47:07 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 10 Feb 2009 22:47:07 -0000
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo5qwtbga8ncjz@gnudebst>

On Tue, 10 Feb 2009 22:02:57 -0000, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> wrote:

> On Tue, 10 Feb 2009 12:06:06 +0000, Duncan Booth wrote:
>
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>
>>> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>>>
>>>> How would I do separate lines into words without scanning one
>>>> character at a time?
>>>
>>> Scan a line at a time, then split each line into words.
>>>
>>>
>>> for line in open('myfile.txt'):
>>>     words = line.split()
>>>
>>>
>>> should work for a particularly simple-minded idea of words.
>>>
>> Or for a slightly less simple minded splitting you could try re.split:
>>
>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>
>
> Perhaps I'm missing something, but the above regex does the exact same
> thing as line.split() except it is significantly slower and harder to
> read.
>
> Neither deal with quoted text, apostrophes, hyphens, punctuation or any
> other details of real-world text. That's what I mean by "simple-minded".

You're missing something :-)  Specifically, the punctuation gets swept
up with the whitespace, and the extended slice skips it.  Apostrophes
(and possibly hyphenation) are still a bit moot, though.



-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From tjreedy at udel.edu  Tue Feb 10 17:57:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:57:54 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <gmt0pf$t6u$1@ger.gmane.org>

r0g wrote:

> 
> def inet2ip(n):
>   p = (n/16777216)
>   q = ((n-(p*16777216))/65536)
>   r = ((n-((p*16777216)+(q*65536)))/256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

Beyond what other wrote:
To future-proof code, use // instead of / for integer division.
To get both quotient and remainder, use divmod(num,den)
For future reading (and generalization) documenting magic constants helps.

In 3.0:

def inet2ip(n):
   p = (n//16777216)
   q = ((n-(p*16777216))//65536)
   r = ((n-((p*16777216)+(q*65536)))//256)
   s = ((n-((p*16777216)+(q*65536)+(r*256))))
   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

def inet2ip2(n):
     p,n=divmod(n,16777216) # 1<<24
     q,n=divmod(n,65536) # 1<<16
     r,s=divmod(n,256) # 1<<8
     return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

print(inet2ip(1000000000), inet2ip2(1000000000))

 >>>
59.154.202.0 59.154.202.0



From paul at boddie.org.uk  Tue Feb 10 17:59:35 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 10 Feb 2009 14:59:35 -0800 (PST)
Subject: "Super()" confusion
References: <mailman.9256.1234295132.3487.python-list@python.org>
Message-ID: <b874abc4-f951-44f4-a6e5-540c3d99d191@v13g2000yqm.googlegroups.com>

On 10 Feb, 20:45, Jean-Paul Calderone <exar... at divmod.com> wrote:
>
> It replaces one kind of repetition with another.  I think each kind is
> about as unpleasant.  Has anyone gathered any data on the frequency of
> changes of base classes as compared to the frequency of classes being
> renamed?  I don't think either happens very often, but it might be
> interesting to see some numbers.

Base class changes are less important than common derived class
functionality. For example, I have employed the following style of
class hierarchy in at least one system:

class ResourceUsingClass:

    """
    Stuff using some resource, like a file.
    Should we close the file when we're finished with it?
    Is that rude? Best not do it!
    """

    def close(self):
        pass # Don't close anything!

class SelfContainedResourceUsingClass(ResourceUsingClass):

    """
    We don't care about keeping the resource open in this class.
    The user of the class should just need to call the close method.
    """

    def close(self):
        ResourceUsingClass.close(self)
        # Now close the resource!

I know that there would be other ways of solving this problem, but in
this case, for every class we want to subclass and provide such
functionality, we need to write a specific close method. With super,
we can avoid being specific about the superclass, but we still need to
write the method unless we define it in a mix-in which appears before
the superclass in the method resolution order.

I think this is the only real use I've found for super, mostly
because, as you say, in most other situations it doesn't actually save
anyone very much effort.

Paul


From tjreedy at udel.edu  Tue Feb 10 18:03:35 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 18:03:35 -0500
Subject: Replace unknow string varible in file.
In-Reply-To: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <gmt143$t6u$2@ger.gmane.org>

namire wrote:
> Hey .python first time poster here. I'm pretty good with python so
> far, but I keep needed a function in my program but not knowing how to
> build it. =( Here's the problem:
> 
> Imagine a html file full of 100's of these strings all mooshed
> together onto many lines;
> <!--"@@MARKER@@; id=ITEM"-->ITEM<br>
> Where the word 'MARKER' is a constant, it stay the same in each string
> and the word 'ITEM' is a random combination of ascii characters of an
> unknown length. So for example a:
> <!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
> h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...
> 
> What I need to do it replace each instance of the random letter with a
> constant and/or delete them. The file is a html file so the stuff
> inside of <!-- --> is ok to keep

I cannot understand what you want to do where.  The last phrase implies 
'leave the comments alone' but you only talked about random letters 
within the comments.  I suggest a minimal but complete example of 
possible input and desired output.

 > and I need that data to identify
> where the strings are in the file (it's full of other stuff too).  I'm
> tired making a bruteforcer but with unknown length and 26 letters of
> the alphabet I gave up because it would take too long (it was
> something like; read file; if '@@MARKER@@; id="'+str(gen_string)+'"--
>> "+sr(gen_string)+'<br>' in file then replace with '', but I'm
> paraphrasing code and it's not the best solution anyway).
> 
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 18:11:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 23:11:10 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
	<mailman.9283.1234305998.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 16:46:30 -0600, Tim Chase wrote:

>>> Or for a slightly less simple minded splitting you could try re.split:
>>>
>>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
>>>>>> over.")[1::2]
>>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>> 
>> 
>> Perhaps I'm missing something, but the above regex does the exact same
>> thing as line.split() except it is significantly slower and harder to
>> read.

...

> Note the difference in "jumps" vs. "jumps,"  (extra comma in the
> string.split() version) and likewise the period after "over". Thus not
> quite "the exact same thing as line.split()".

Um... yes. I'll just slink away quietly now... nothing to see here...


-- 
Steven


From travis+ml-python at subspacefield.org  Tue Feb 10 18:12:15 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Tue, 10 Feb 2009 17:12:15 -0600
Subject: zlib interface semi-broken
In-Reply-To: <hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
Message-ID: <20090210231215.GU6522@subspacefield.org>

On Tue, Feb 10, 2009 at 01:36:21PM -0800, Scott David Daniels wrote:
> >A simple way to fix this would be to add a finished attribute to the
> >Decompress object.
> Perhaps you could submit a patch with such a change?

Yes, I will try and get to that this week.

> >However, perhaps this would be a good time to discuss how this library
> >works; it is somewhat awkward and perhaps there are other changes which
> >would make it cleaner.
> Well, it might be improvable, I haven't really looked.  I personally
> would like it and bz2 to get closer to each other in interface, rather
> than to spread out.  SO if you are really opening up a can of worms,
> I vote for two cans.

Well, I like this idea; perhaps this is a good time to discuss the
equivalent of some "abstract base classes", or "interfaces", for
compression.

As I see it, the fundamental abstractions are the stream-oriented
de/compression routines.  Given those, one should easily be able to
implement one-shot de/compression of strings.  In fact, that is the
way that zlib is implemented; the base functions are the
stream-oriented ones and there is a layer on top of convenience
functions that do one-shot compression and decompression.

After examining the bz2 module, I notice that it has a file-like
interface called bz2file, which is roughly analogous to the gzip
module.  That file interface could form a third API, and basically
conform to what python expects of files.

So what I suggest is a common framework of three APIs; a sequential
compression/decompression API for streams, a layer (potentially
generic) on top of those for strings/buffers, and a third API for
file-like access.  Presumably the file-like access can be implemented
on top of the sequential API as well.

If the sequential de/compression routines are indeed primitive, and
sufficient for the implementation of the other two APIs, then that
gives us the option of implementing the other "upper" two layers in
pure python, potentially simplifying the amount of extension code that
has to be written.  I see that as desirable, since it gives us options
for writing the upper two layers; in pure python, or by writing
extensions to the C code where available.

I seem to recall a number of ancilliary functions in zlib, such as
those for loading a compression dictionary.  There are also options
such as flushing the compression in order to be able to resynchronize
should part of the archive become garbled.  Where these functions are
available, they could be implemented, though it would be desirable to
give them the same name in each module to allow client code to test
for their existence in a compression-agnostic way.

For what it's worth, I would rather see a pythonic interface to the
libraries than a simple-as-can-be wrapper around the C functions.  I
personally find it annoying to have to drop down to non-OOP styles in
a python program in order to use a C library.  It doesn't matter to me
whether the OOP layer is added atop the C library in pure python or in
the C-to-python binding; that is an implementation detail to me, and I
suspect to most python programmers.  They don't care, they just want
it easy to use from python.  If performance turns out to matter, and
the underlying compression library supports an "upper layer" in C,
then we have the option for using that code.

So my suggestion is that we (the python users) brainstorm on how we
want the API to look, and not focus on the underlying library except
insofar as it informs our discussion of the proper APIs - for example,
features such as flushing state, setting compression levels/windows,
or for resynchronization points.

My further suggestion is that we start with the sequential
de/compression, since it seems like a fundamental primitive.
De/compressing strings will be trivial, and the file-like interface is
already described by Python.

So my first suggestion on the stream de/compression API thread is:

The sequential de/compression needs to be capable of returning
more than just the de/compressed data.  It should at least be
capable of returning end-of-stream conditions and possibly
other states as well.  I see a few ways of implementing this:

1) The de/compression object holds state in various members such as
data input buffers, data output buffers, and a state for indicating
states such as synchronization points or end-of-stream states.  Member
functions are called and primarily manipulate the data members of the
object.

2) The de/compression object has routines for reading de/compressed
data and states such as end-of-stream or resynchronization points as
exceptions, much like the file class can throw EOFError.  My problem
with this is that client code has to be cognizant of the possible
exceptions that might be thrown, and so one cannot easily add new
exceptions should the need arise.  For example, if we add an exception
to indicate a possible resynchronization point, client code may not
be capable of handling it as a non-fatal exception.

Thoughts?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From google at mrabarnett.plus.com  Tue Feb 10 18:20:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 10 Feb 2009 23:20:05 +0000
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>	<mailman.9283.1234305998.3487.python-list@python.org>
	<pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>
Message-ID: <49920BA5.5010008@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Tue, 10 Feb 2009 16:46:30 -0600, Tim Chase wrote:
> 
>>>> Or for a slightly less simple minded splitting you could try re.split:
>>>>
>>>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
>>>>>>> over.")[1::2]
>>>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>>>
>>> Perhaps I'm missing something, but the above regex does the exact same
>>> thing as line.split() except it is significantly slower and harder to
>>> read.
> 
> ...
> 
>> Note the difference in "jumps" vs. "jumps,"  (extra comma in the
>> string.split() version) and likewise the period after "over". Thus not
>> quite "the exact same thing as line.split()".
> 
> Um... yes. I'll just slink away quietly now... nothing to see here...
> 
You could've used str.translate to strip out the unwanted characters.


From dchandran1 at tinkercell.com  Tue Feb 10 18:21:57 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Tue, 10 Feb 2009 15:21:57 -0800
Subject: embedding Python in a shared library
Message-ID: <5dfe78f40902101521o443684fdje8450f19ed881060@mail.gmail.com>

I have embedded Python in a shared library. This works fine in Windows
(dll), but I get the following error is Ubuntu when I try to load modules:

/usr/lib/python2.5/lib-dynload/*time.so*: error: symbol lookup error: *
undefined* symbol: PyExc_ValueError


I found many postings on this issue on the internet, but I was not able to
find a solution that worked. I tried to load libpython2.5.so.1 into my
program using dlopen, but that crashed the program for some reason. I tried
building my library using the libpython2.5.a, but the same error was there.

I am sure someone has a solution to this, since it seems like a general
issue.
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From ntwrkd at gmail.com  Tue Feb 10 18:32:28 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 15:32:28 -0800
Subject: optparse versus getopt
In-Reply-To: <gmssmk$eai$1@ger.gmane.org>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
	<gmssmk$eai$1@ger.gmane.org>
Message-ID: <f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>

its a debian package. 2.5

importing optparse works with interactive python, but not through the
jython interpreter i an using.

is there some way i can force the import based on the the absolute
path to the module?

On Tue, Feb 10, 2009 at 1:48 PM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-10 15:42, Matthew Sacks wrote:
>>
>> it seems as if optparse isn't in my standard library.
>
> How did you install your Python? It has been part of the standard library
> for a very long time.
>
>> is there a way to add a lib like ruby gems?
>
> http://docs.python.org/install/index.html
>
> But optparse (named Optik when it was a separate package) has not been
> distributed separately from Python for a long time.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it
> had
>  an underlying truth."
>  -- Umberto Eco
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From aioe.org at technicalbloke.com  Tue Feb 10 18:38:20 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 18:38:20 -0500
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
	<f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>
Message-ID: <gmt34e$elu$1@aioe.org>

bearophileHUGS at lycos.com wrote:
> Here a small benchmark:
> 
> def ip2inet01(a): # can't be used with 6
>     li = a.split('.')
<snip>

Wow, thanks everybody for all the suggestions, v.interesting esp as I
didn't even ask for any suggestions!  This is a fantastically didactic
newsgroup: you start off just musing about functional programming, you
end up learning python has a rich set of augmented assignment operators,
brilliant :-)


Roger Heathcote.


From robert.kern at gmail.com  Tue Feb 10 18:39:48 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 17:39:48 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>	<4991F3DB.5000802@tim.thechases.com>	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>	<gmssmk$eai$1@ger.gmane.org>
	<f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
Message-ID: <gmt385$4r6$1@ger.gmane.org>

On 2009-02-10 17:32, Matthew Sacks wrote:
> its a debian package. 2.5
>
> importing optparse works with interactive python, but not through the
> jython interpreter i an using.

Ah, yes. The current version of Jython is still based off of Python 2.2 whereas 
optparse was introduced in Python 2.3.

> is there some way i can force the import based on the the absolute
> path to the module?

Better would be for you to copy the optparse.py module onto your Jython's import 
path. I'm not particularly familiar with the details of Jython, so you will need 
to consult with the Jython documentation unless if a Jython expert can jump in 
here. Here is one message describing this procedure:

   http://osdir.com/ml/lang.jython.user/2004-01/msg00086.html

You may want to ask Jython specific questions on the Jython mailing list. You 
will probably get more on-target answers faster there.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From http  Tue Feb 10 18:51:08 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 15:51:08 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
	<8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>
Message-ID: <7xd4dpsvf7.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> I suspect that is why such an interface never came up (If
> you can clone states, then you can say: "compress this, then use the
> resultant state to compress/decompress others." 

The zlib C interface supports something like that.  It is just not
exported to the python application.  It should be.


From aioe.org at technicalbloke.com  Tue Feb 10 18:55:17 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 18:55:17 -0500
Subject: Escaping my own chroot...
Message-ID: <gmt446$fq0$1@aioe.org>

I'm writing a linux remastering script in python where I need to chroot
into a folder, run some system commands and then come out and do some
tidying up, un-mounting proc & sys etc.

I got in there with os.chroot() and I tried using that to get back out
but that didn't work so... is my script trapped in there forever now or
is there an un-hacky way to escape?

If it is an OS restriction rather than my ignorance of python is there a
canonical way of dealing with it? Should I maybe fork a process, have it
do the chroot and wait for it to terminate before continuing?

Apologies if this turn out to be OT!


Roger.


From bmaschino at gmail.com  Tue Feb 10 19:02:40 2009
From: bmaschino at gmail.com (bmaschino at gmail.com)
Date: Tue, 10 Feb 2009 16:02:40 -0800 (PST)
Subject: pySerial help please!
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
	<6vee48FjmnodU1@mid.uni-berlin.de>
Message-ID: <047322d9-9311-42b8-a1cf-f17830606e27@s20g2000yqh.googlegroups.com>

On Feb 10, 5:41?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> bmasch... at gmail.com schrieb:
>
>
>
>
>
> > Hello all,
>
> > I am very new to Python and I am using it because I needed an easy
> > language to control a piece of equipment that connects to my computer
> > via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> > Windows. I can get Python to create a serial port on COM1, but when I
> > try to write to the device, nothing happens. Here is an example:
>
> > import serial
> > ser = serial.Serial(0)
> > ser.write("otpm 2 16 0")
> > ser.close()
>
> > If I connect to the device in Hyperterminal the device will behave as
> > expected when I give it the command 'otpm 2 16 0' but not in Python. I
> > have confirmed Python is actually controlling the port because
> > Hyperterminal will not open the port while Python has it open,
> > although I have not been able to try a loopback connector as of yet.
> > Any suggestions out there? Thanks in advance!
>
> You need to give a newline, you press return on the terminal as well,
> don't you?
>
> Diez- Hide quoted text -
>
> - Show quoted text -

Yes! That was exactly the problem. I replaced ser.write("otpm x x x")
to ("otpm x x x\n") and it WORKS!! Thank you!


From aahz at pythoncraft.com  Tue Feb 10 19:08:20 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 16:08:20 -0800
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <gmt4tk$jph$1@panix3.panix.com>

In article <4c7158d2-5663-46b9-b950-be81bd79964c at z6g2000pre.googlegroups.com>,
Emanuele D'Arrigo <manu3d at gmail.com> wrote:
>
>I'm having a ball with the power of regular expression but I stumbled
>on something I don't quite understand:

Book recommendation: _Mastering Regular Expressions_, Jeffrey Friedl
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 19:28:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 22:28:46 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
Message-ID: <op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 18:01:53 -0200, Daniel Fetchinson  
<fetchinson at googlemail.com> escribi?:
> On 2/9/09, Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
>> En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson
>> <fetchinson at googlemail.com> escribi?:
>>
>>>>>> Consider whether you really need to use super().
>>>>>> http://fuhm.net/super-harmful/
>>>
>>> Because throwing around that link carries about the same amount of
>>> information as "perl is better than python", "my IDE is better than
>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>>
>> Not at all. It contains accurate and valuable information that isn't
>> available elsewhere.
>
> But does not contain other valuable information which would demystify
> super. If only this source is shown to a person who wants to learn the
> proper usage of super, the impression he/she gets will be distorted.

Why so? At the end there is a "best practices" recipe that pretty much  
summarizes the proper usage of super, and AFAIK it's the right way to use  
it. Don't you agree with any of the conclusions?

> Example: 1. somebody asks about threading 2. reply comes: there is a
> GIL! you can't do real threading. Now this reply might be technically
> more-or-less correct, it is misleading and does not help the poster.
> An informed discussion of the various solutions that does not involve
> a rant about the GIL would be very useful though.

As I said, the article presents a "recipe" for super() usage, and I'd  
consider it very helpful. It's far from just saying "super s*cks!", or  
"the GIL s*cks!" or something like that.

> You might want to start with
>
> http://www.artima.com/weblogs/viewpost.jsp?thread=236275

...which, although the author says it was written a long time ago, was not  
published until less than six months ago, and has very low visibility.

> You are right, it's not in the documentation. But if somebody asks on
> c.l.p the appropriate answer, I think, is to point to information such
> as the one above, and not the misleading "harmful" essay.

According to Google, nobody has menctioned the "harmful" essay in this  
group since April 2008 [1], months before Simionato's article were  
available... So this is the *first* time the reference to the former essay  
could have been replaced by M.S.' one... don't be so strict!

Anyway, the right thing to do, IMHO, is to publish correct and accurate  
documentation in the main Python site. Not everybody knows about this  
group existence, nor has the time/experience/interest on subscribe here,  
post a question and wait for an answer. I've seen some posts in python-dev  
saying something like "this is confusing, we should evangelize people on  
c.l.p. on the right way to do it" and I completely disagree; the right  
place for such things is the product documentation, or -to a much lesser  
degree because it's online only- some article collection linked from the  
main site (like the "Other resources" left bar, already present).

>>> Honestly, I don't understand how this thing got so much out of
>>> control. If anyone starts an intelligent question or remark about
>>> super, this essay is thrown in no matter what. Anyone can explain why?
>>
>> Because for a very loooooong time (seven years, 2001-2008) super was
>> almost undocumented. The Library Reference -before release 2.6- only  
>> had a short paragraph, the [...]
>
> You are right, the documentation needs some work in this regard. But
> again, just because some sources are not in the documentation doesn't
> mean that the most opinionated essay is the best source. A little
> search turns up much more useful ones.

(not according to Google [2]: I get the "harmful" article in the top, the  
thread in python-dev, a couple threads in c.l.p including posts by M.S.,  
his article in artima, and nothing more relevant than "Monty Python Super  
Star" up to the 3rd page)

*Now* that *I* am aware of the recent article series by M.S., the next  
time someone asks *me* about super(), probably I'll refer her to both M.S.  
and J.K.'s articles. Last time I checked (perhaps one or two years ago),  
the "harmful" article was almost the only relevant source of info about  
super().

[1]  
http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
[2] http://www.google.com/search?q=python+super

-- 
Gabriel Genellina



From evanstimk at gmail.com  Tue Feb 10 19:56:43 2009
From: evanstimk at gmail.com (tkevans)
Date: Tue, 10 Feb 2009 16:56:43 -0800 (PST)
Subject: relocation R_X86_64_32 against `a local symbol' can not be used when 
	making a shared object; recompile with -fPIC
Message-ID: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>

Found a couple of references to this in the newsgroup, but no
solutions.

I'm trying to build libsbml-3.3.0 with python 2.5.4 support on RHEL
5.3.  This RedHat distro has python 2.4.5, and libsbml builds ok with
that release.

After building 2.5.4 (./configure CFLAGS=-fPIC , as the error message
suggests), ld still croaks here:

g++ -L../../ -L/usr/local/lib/python2.5/config   -shared -o
_libsbml.so libsbml_wrap.o -lsbml -lpython2.5 -lxml2 -lz -lm -lm   -lz
-lbz2
/usr/bin/ld: /usr/local/lib/python2.5/config/libpython2.5.a
(abstract.o): relocation R_X86_64_32 against `a local symbol' can not
be used when making a shared object; recompile with -fPIC
/usr/local/lib/python2.5/config/libpython2.5.a: could not read
symbols: Bad value
collect2: ld returned 1 exit status

Help appreciated


From noama at answers.com  Tue Feb 10 20:02:00 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 11 Feb 2009 03:02:00 +0200
Subject: Propagating function calls
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>

Suppose I have a python object X, which holds inside it a python object
Y. How can I propagate each function call to X so the same function call
in Y will be called, i.e:

X.doThatFunkyFunk()

Would cause

Y.doThatFunkyFunk()

Thanks, Noam

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From python at bdurham.com  Tue Feb 10 20:03:41 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 20:03:41 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmt34e$elu$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
	<f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>
	<gmt34e$elu$1@aioe.org>
Message-ID: <1234314221.16319.1299684607@webmail.messagingengine.com>

> This is a fantastically didactic newsgroup: you start off just musing about <fill-in-the-blank>, you end up learning python has <some great feature>, brilliant :-)

+1 !!

Malcolm


From clp2 at rebertia.com  Tue Feb 10 20:10:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 17:10:40 -0800
Subject: Propagating function calls
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
Message-ID: <50697b2c0902101710t54130e57h3c2472ab9d57999b@mail.gmail.com>

On Tue, Feb 10, 2009 at 5:02 PM, Noam Aigerman <noama at answers.com> wrote:
> Suppose I have a python object X, which holds inside it a python object Y.
> How can I propagate each function call to X so the same function call in Y

That'd be a method call actually, not a function call.

> will be called, i.e:
>
> X.doThatFunkyFunk()
>
> Would cause
>
> Y.doThatFunkyFunk()

Use a simple proxy (this will forward attribute accesses too, but that
doesn't usually matter and can be worked around if necessary):

class Delegator(object):
    def __init__(self, delegate):
        self.delegate = delegate
    def __getattr__(self, attr):
        return getattr(self.delegate, attr)

Example:
>>> a=Delegator([])
>>> a.append(5)
>>> a.delegate
[5]

Note that this won't forward the operator special methods (e.g. __add__).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From ntwrkd at gmail.com  Tue Feb 10 20:12:46 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 17:12:46 -0800
Subject: getopt
Message-ID: <f257b9ab0902101712y5f1162ddic32dd5ec5fcd6d64@mail.gmail.com>

if anyone can have a look at this code and offer suggestions i would
appreciate it.
i am forced to use getopt, so i cant use something good like optparse

passedArgs = sys.argv[1:]
optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
"adminServerURL=", "action=", "targets=", "appDir="])


for some reason this does not work in assigning args to opts.


i want to take all of the command line options and assign them to strings

here is how i am currently going about it

for o,a in optlist:
	if o == "--connectPassword":
		connectPassword = a
		print "Connect password assigned as " + a
                continue
	elif o == "--adminServerURL":
		adminServerURL = a
		print "adminServerURL " + a
                continue
	else:
		print "No connection Arguments Specified"
		

TIV


From prologic at shortcircuit.net.au  Tue Feb 10 20:24:49 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Wed, 11 Feb 2009 11:24:49 +1000
Subject: Propagating function calls
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
Message-ID: <e1a84d570902101724x58ea4b86s2504d261e4be9757@mail.gmail.com>

On Wed, Feb 11, 2009 at 11:02 AM, Noam Aigerman <noama at answers.com> wrote:
> Suppose I have a python object X, which holds inside it a python object Y.
> How can I propagate each function call to X so the same function call in Y
> will be called, i.e:
>
> X.doThatFunkyFunk()
>
> Would cause
>
> Y.doThatFunkyFunk()

Noam, using circuits [1] you could do this:

----
from circuits import Event, Component, Manager

class X(Component):

   def doThatFunkyFunk(self):
      ...

class Y(Component):

   def doThatFunkyFunk(self):
      ...

manager = Manager()
manager += X()
manager += Y()

manager.send(Event(), "doThatFunkyFunk")
----

cheers
James

[1] http://pypi.python.org/pypi/circuits/


From sjmachin at lexicon.net  Tue Feb 10 20:25:44 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 17:25:44 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org>
Message-ID: <e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>

On Feb 11, 12:12?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> if anyone can have a look at this code and offer suggestions i would
> appreciate it.
> i am forced to use getopt, so i cant use something good like optparse
>
> passedArgs = sys.argv[1:]
> optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",

Dunno where you acquired the str() ... just lose it. Consider checking
with the documentation when something "does not work".

> "adminServerURL=", "action=", "targets=", "appDir="])
>
> for some reason this does not work in assigning args to opts.
>


From aahz at pythoncraft.com  Tue Feb 10 20:28:57 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 17:28:57 -0800
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
Message-ID: <gmt9kp$a1f$1@panix3.panix.com>

In article <2ba4f763-79fa-423e-b082-f9de829ae964 at i20g2000prf.googlegroups.com>,
Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>
>Just out of curiosity, am I the only one who think that switching to
>3.x right now is not a good idea?

Hardly.  I certainly wouldn't consider it for production software, but
installing it to play with probably is a Good Idea -- it's the future,
after all.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 20:58:07 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 11 Feb 2009 01:58:07 GMT
Subject: Avoiding argument checking in recursive calls
Message-ID: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>

I sometimes write recursive functions like this simple factorial:


def fact(n):
    if n < 0: raise ValueError
    if n = 0: return 1
    return fact(n-1)*n 

At the risk of premature optimization, I wonder if there is an idiom for 
avoiding the unnecessary test for n <= 0 in the subsequent recursive 
calls? For the sake of the argument, let's pretend the test is expensive 
and I have a good reason for wanting to avoid it on subsequent calls :)



I've done this:

def _fact(n):
    if n = 0: return 1
    return _fact(n-1)*n 

def fact(n):
    if n < 0: raise ValueError
    return _fact(n)

but that's ugly. What else can I do?



-- 
Steven


From fetchinson at googlemail.com  Tue Feb 10 21:25:57 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 18:25:57 -0800
Subject: "Super()" confusion
In-Reply-To: <op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>

>>>>>>> Consider whether you really need to use super().
>>>>>>> http://fuhm.net/super-harmful/
>>>>
>>>> Because throwing around that link carries about the same amount of
>>>> information as "perl is better than python", "my IDE is better than
>>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>>>
>>> Not at all. It contains accurate and valuable information that isn't
>>> available elsewhere.
>>
>> But does not contain other valuable information which would demystify
>> super. If only this source is shown to a person who wants to learn the
>> proper usage of super, the impression he/she gets will be distorted.
>
> Why so? At the end there is a "best practices" recipe that pretty much
> summarizes the proper usage of super, and AFAIK it's the right way to use
> it. Don't you agree with any of the conclusions?
>
>> Example: 1. somebody asks about threading 2. reply comes: there is a
>> GIL! you can't do real threading. Now this reply might be technically
>> more-or-less correct, it is misleading and does not help the poster.
>> An informed discussion of the various solutions that does not involve
>> a rant about the GIL would be very useful though.
>
> As I said, the article presents a "recipe" for super() usage, and I'd
> consider it very helpful. It's far from just saying "super s*cks!", or
> "the GIL s*cks!" or something like that.
>
>> You might want to start with
>>
>> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
>
> ...which, although the author says it was written a long time ago, was not
> published until less than six months ago, and has very low visibility.
>
>> You are right, it's not in the documentation. But if somebody asks on
>> c.l.p the appropriate answer, I think, is to point to information such
>> as the one above, and not the misleading "harmful" essay.
>
> According to Google, nobody has menctioned the "harmful" essay in this
> group since April 2008 [1], months before Simionato's article were
> available... So this is the *first* time the reference to the former essay
> could have been replaced by M.S.' one... don't be so strict!
>
> Anyway, the right thing to do, IMHO, is to publish correct and accurate
> documentation in the main Python site. Not everybody knows about this
> group existence, nor has the time/experience/interest on subscribe here,
> post a question and wait for an answer. I've seen some posts in python-dev
> saying something like "this is confusing, we should evangelize people on
> c.l.p. on the right way to do it" and I completely disagree; the right
> place for such things is the product documentation, or -to a much lesser
> degree because it's online only- some article collection linked from the
> main site (like the "Other resources" left bar, already present).
>
>>>> Honestly, I don't understand how this thing got so much out of
>>>> control. If anyone starts an intelligent question or remark about
>>>> super, this essay is thrown in no matter what. Anyone can explain why?
>>>
>>> Because for a very loooooong time (seven years, 2001-2008) super was
>>> almost undocumented. The Library Reference -before release 2.6- only
>>> had a short paragraph, the [...]
>>
>> You are right, the documentation needs some work in this regard. But
>> again, just because some sources are not in the documentation doesn't
>> mean that the most opinionated essay is the best source. A little
>> search turns up much more useful ones.
>
> (not according to Google [2]: I get the "harmful" article in the top, the
> thread in python-dev, a couple threads in c.l.p including posts by M.S.,
> his article in artima, and nothing more relevant than "Monty Python Super
> Star" up to the 3rd page)
>
> *Now* that *I* am aware of the recent article series by M.S., the next
> time someone asks *me* about super(), probably I'll refer her to both M.S.
> and J.K.'s articles. Last time I checked (perhaps one or two years ago),
> the "harmful" article was almost the only relevant source of info about
> super().
>
> [1]
> http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
> [2] http://www.google.com/search?q=python+super

Okay, I think we converged to a common denominator. I agree with you
that the documentation needs additions about super and I also agree
with you that referring to both MS and JK articles is appropriate when
a question about super comes up.

It's good to have a discussion when views actually converge and not
diverge at the end :)

Cheers,
Daniel


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From benjamin.kaplan at case.edu  Tue Feb 10 21:31:06 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 10 Feb 2009 21:31:06 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
	<fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
Message-ID: <ec96e1390902101831o49b619e8u4b5234397fd3c2d7@mail.gmail.com>

On Tue, Feb 10, 2009 at 9:25 PM, Daniel Fetchinson <
fetchinson at googlemail.com> wrote:

> >>>>>>> Consider whether you really need to use super().
> >>>>>>> http://fuhm.net/super-harmful/
> >>>>
> >>>> Because throwing around that link carries about the same amount of
> >>>> information as "perl is better than python", "my IDE is better than
> >>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
> >>>
> >>> Not at all. It contains accurate and valuable information that isn't
> >>> available elsewhere.
> >>
> >> But does not contain other valuable information which would demystify
> >> super. If only this source is shown to a person who wants to learn the
> >> proper usage of super, the impression he/she gets will be distorted.
> >
> > Why so? At the end there is a "best practices" recipe that pretty much
> > summarizes the proper usage of super, and AFAIK it's the right way to use
> > it. Don't you agree with any of the conclusions?
> >
> >> Example: 1. somebody asks about threading 2. reply comes: there is a
> >> GIL! you can't do real threading. Now this reply might be technically
> >> more-or-less correct, it is misleading and does not help the poster.
> >> An informed discussion of the various solutions that does not involve
> >> a rant about the GIL would be very useful though.
> >
> > As I said, the article presents a "recipe" for super() usage, and I'd
> > consider it very helpful. It's far from just saying "super s*cks!", or
> > "the GIL s*cks!" or something like that.
> >
> >> You might want to start with
> >>
> >> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
> >
> > ...which, although the author says it was written a long time ago, was
> not
> > published until less than six months ago, and has very low visibility.
> >
> >> You are right, it's not in the documentation. But if somebody asks on
> >> c.l.p the appropriate answer, I think, is to point to information such
> >> as the one above, and not the misleading "harmful" essay.
> >
> > According to Google, nobody has menctioned the "harmful" essay in this
> > group since April 2008 [1], months before Simionato's article were
> > available... So this is the *first* time the reference to the former
> essay
> > could have been replaced by M.S.' one... don't be so strict!
> >
> > Anyway, the right thing to do, IMHO, is to publish correct and accurate
> > documentation in the main Python site. Not everybody knows about this
> > group existence, nor has the time/experience/interest on subscribe here,
> > post a question and wait for an answer. I've seen some posts in
> python-dev
> > saying something like "this is confusing, we should evangelize people on
> > c.l.p. on the right way to do it" and I completely disagree; the right
> > place for such things is the product documentation, or -to a much lesser
> > degree because it's online only- some article collection linked from the
> > main site (like the "Other resources" left bar, already present).
> >
> >>>> Honestly, I don't understand how this thing got so much out of
> >>>> control. If anyone starts an intelligent question or remark about
> >>>> super, this essay is thrown in no matter what. Anyone can explain why?
> >>>
> >>> Because for a very loooooong time (seven years, 2001-2008) super was
> >>> almost undocumented. The Library Reference -before release 2.6- only
> >>> had a short paragraph, the [...]
> >>
> >> You are right, the documentation needs some work in this regard. But
> >> again, just because some sources are not in the documentation doesn't
> >> mean that the most opinionated essay is the best source. A little
> >> search turns up much more useful ones.
> >
> > (not according to Google [2]: I get the "harmful" article in the top, the
> > thread in python-dev, a couple threads in c.l.p including posts by M.S.,
> > his article in artima, and nothing more relevant than "Monty Python Super
> > Star" up to the 3rd page)
> >
> > *Now* that *I* am aware of the recent article series by M.S., the next
> > time someone asks *me* about super(), probably I'll refer her to both
> M.S.
> > and J.K.'s articles. Last time I checked (perhaps one or two years ago),
> > the "harmful" article was almost the only relevant source of info about
> > super().
> >
> > [1]
> >
> http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
> > [2] http://www.google.com/search?q=python+super
>
> Okay, I think we converged to a common denominator. I agree with you
> that the documentation needs additions about super and I also agree
> with you that referring to both MS and JK articles is appropriate when
> a question about super comes up.
>
> It's good to have a discussion when views actually converge and not
> diverge at the end :)


Wait, that's not supposed to happen. This is Usenet after all. Quick,
someone comment on the GIL!

--
> Psss, psss, put it down! - http://www.cafepress.com/putitdown
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mark.seagoe at gmail.com  Tue Feb 10 21:31:26 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Tue, 10 Feb 2009 18:31:26 -0800 (PST)
Subject: Iterable Ctypes Struct
Message-ID: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>

I like the ability to access elements of a struct such as with ctypes
Structure:
>>>myStruct.elementName1
4

What I like about it is there are no quotes needed.

What I don't like about it is that it's not iterable:
>>>for n in myStruct:  <== gives error
>>>    print n

I don't want to force the end user to have preknowledge of the element
names.
Has anyone subclassed ctypes Structure based class to be iterable?
Before a noob starts trying to do this, is it possible?  How to
approach it?

Thx,
Mark


From grante at visi.com  Tue Feb 10 21:45:09 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 10 Feb 2009 20:45:09 -0600
Subject: pySerial help please!
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <SYydnYvNmeMopg_UnZ2dnUVZ_h6dnZ2d@posted.usinternet>

On 2009-02-10, bmaschino at gmail.com <bmaschino at gmail.com> wrote:
> Hello all,
>
> I am very new to Python and I am using it because I needed an
> easy language to control a piece of equipment that connects to
> my computer via a serial cable. I am running Python 2.6 with
> pySerial 2.4 under Windows. I can get Python to create a
> serial port on COM1, but when I try to write to the device,
> nothing happens. Here is an example:
>
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()

Are you sure you don't need some sort of line-terminator (e.g
\r or \n) to tell the device to go ahead and execute the command?

> If I connect to the device in Hyperterminal the device will
> behave as expected when I give it the command 'otpm 2 16 0'
> but not in Python.

In Hyperterminal did you have to press [enter] to get the
command to execute?

If you close the port immediately after calling write(), it's
possible that the data never actually got sent.  You should
probably wait until the data has been sent before closing the
port.

If you're running on Unix, I you should be able to call
ser.flush() to wait until the output buffer has been sent.

However, I wouldn't count too heavily on the underlying Unix
serial driver properly implimenting the tcdrain call.  And, I
think the flush() call on Windows is a noop.  So, putting an
appropriate delay between the write and the close is probably
the safest thing to do.

-- 
Grant



From jervisau at gmail.com  Tue Feb 10 21:48:09 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 13:48:09 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <8e63a5ce0902101848k3e5be249n1892ba6c12588d4b@mail.gmail.com>

> I've done this:
>
> def _fact(n):
>    if n = 0: return 1
>    return _fact(n-1)*n
>
> def fact(n):
>    if n < 0: raise ValueError
>    return _fact(n)
>
> but that's ugly. What else can I do?
>
>
Hello, an idea is optional keyword arguments.

def fact(n, check=False):
  if not check:
    if n < 0: raise ValueError
  if n == 0: return 1
  return fact(n - 1, check=True) * n

essentially hiding an expensive check with a cheap one. It saves you
duplicating code in a separate function like in your example.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 21:57:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 00:57:27 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
	<fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
	<ec96e1390902101831o49b619e8u4b5234397fd3c2d7@mail.gmail.com>
Message-ID: <op.uo52h1wix6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 00:31:06 -0200, Benjamin Kaplan  
<benjamin.kaplan at case.edu> escribi?:
> On Tue, Feb 10, 2009 at 9:25 PM, Daniel Fetchinson <
> fetchinson at googlemail.com> wrote:
>
>> Okay, I think we converged to a common denominator. I agree with you
>> that the documentation needs additions about super and I also agree
>> with you that referring to both MS and JK articles is appropriate when
>> a question about super comes up.
>>
>> It's good to have a discussion when views actually converge and not
>> diverge at the end :)
>
> Wait, that's not supposed to happen. This is Usenet after all. Quick,
> someone comment on the GIL!

Our resident trolls are sleeping, it seems...

-- 
Gabriel Genellina



From python at bdurham.com  Tue Feb 10 22:38:49 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 22:38:49 -0500
Subject: Difference between vars() and locals() and use case for vars()
Message-ID: <1234323529.11589.1299703567@webmail.messagingengine.com>

Can someone explain the difference between vars() and locals()?
I'm also trying to figure out what the use case is for vars(),
eg. when does it make sense to use vars() in a program?
Thank you,
Malcolm
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From gagsl-py2 at yahoo.com.ar  Tue Feb 10 23:04:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 02:04:47 -0200
Subject: Difference between vars() and locals() and use case for vars()
References: <1234323529.11589.1299703567@webmail.messagingengine.com>
Message-ID: <op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 01:38:49 -0200, <python at bdurham.com> escribi?:

> Can someone explain the difference between vars() and locals()?
> I'm also trying to figure out what the use case is for vars(),
> eg. when does it make sense to use vars() in a program?

Without arguments, vars() returns the current namespace -- same as  
locals() inside a function, same as locals() *and* globals() outside any  
function (i.e., in a module or running in the interactive interpreter)

With an argument (that is, vars(x)) it returns the names defined by the  
object itself; for "normal" class instances, that means its __dict__

It's useful in the interactive interpreter, to examine some object's  
contents. Maybe in other special cases. Certainly not in everyday's  
programming.

-- 
Gabriel Genellina



From python at bdurham.com  Tue Feb 10 23:10:35 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 23:10:35 -0500
Subject: Difference between vars() and locals() and use case for vars()
In-Reply-To: <op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>
References: <1234323529.11589.1299703567@webmail.messagingengine.com>
	<op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <1234325435.17704.1299707517@webmail.messagingengine.com>

Thank you Gabriel!

Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 11 Feb 2009 02:04:47 -0200
Subject: Re: Difference between vars() and locals() and use case for
vars()

En Wed, 11 Feb 2009 01:38:49 -0200, <python at bdurham.com> escribi?:

> Can someone explain the difference between vars() and locals()?
> I'm also trying to figure out what the use case is for vars(),
> eg. when does it make sense to use vars() in a program?

Without arguments, vars() returns the current namespace -- same as  
locals() inside a function, same as locals() *and* globals() outside any 
function (i.e., in a module or running in the interactive interpreter)

With an argument (that is, vars(x)) it returns the names defined by the  
object itself; for "normal" class instances, that means its __dict__

It's useful in the interactive interpreter, to examine some object's  
contents. Maybe in other special cases. Certainly not in everyday's  
programming.

-- 
Gabriel Genellina

--
http://mail.python.org/mailman/listinfo/python-list


From lepto.python at gmail.com  Tue Feb 10 23:21:12 2009
From: lepto.python at gmail.com (oyster)
Date: Wed, 11 Feb 2009 12:21:12 +0800
Subject: can multi-core improve single funciton?
Message-ID: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>

Hi, guys, my fib(xx) is just an example to show "what is a single
function" and "what is the effect I expect to see when enable
multi-core".

My real purpose is to know "whether multi-core can help to improve the
speed of a common function". But I know definitely that the answer is
NO.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 23:31:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 02:31:16 -0200
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo56uek9x6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 23:58:07 -0200, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> escribi?:

> I sometimes write recursive functions like this simple factorial:
>
>
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n
>
> At the risk of premature optimization, I wonder if there is an idiom for
> avoiding the unnecessary test for n <= 0 in the subsequent recursive
> calls? For the sake of the argument, let's pretend the test is expensive
> and I have a good reason for wanting to avoid it on subsequent calls :)
>
>
>
> I've done this:
>
> def _fact(n):
>     if n = 0: return 1
>     return _fact(n-1)*n
>
> def fact(n):
>     if n < 0: raise ValueError
>     return _fact(n)
>
> but that's ugly. What else can I do?

I don't think it's ugly; you have an implementation (_fact) and its public  
interfase (fact). In 'fact' you could check that n is actually an integer  
(an implicit precondition, your algorithm doesn't finish in other case)  
and whatever validation is also required. Perhaps its arguments come from  
user input and you need stricter tests, or convert from other type (like  
float->int).
On the other hand, '_fact' is private and you can assume their arguments  
are exactly what you require.
In Pascal I would have used a nested _fact function; in Python it isn't as  
efficient so I'd write it as your own example.

This is a rather used idiom - in the Python C API, by example, usually you  
see a public function PyFoo_DoSomething(PyObject* obj) and a private one  
_PyFoo_DoSomething(double x) (assume a function like sqrt, number ->  
float). The public one takes a generic Python object, checks its type,  
converts it to a C "double" value, and if all went OK, finally calls the  
private implementation passing that value.

-- 
Gabriel Genellina



From afriere at yahoo.co.uk  Tue Feb 10 23:42:47 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Tue, 10 Feb 2009 20:42:47 -0800 (PST)
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au> 
	<mailman.9300.1234320496.3487.python-list@python.org>
Message-ID: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>

On Feb 11, 1:48?pm, Jervis Whitley <jervi... at gmail.com> wrote:

> Hello, an idea is optional keyword arguments.
>
> def fact(n, check=False):
> ? if not check:
> ? ? if n < 0: raise ValueError
> ? if n == 0: return 1
> ? return fact(n - 1, check=True) * n
>
> essentially hiding an expensive check with a cheap one. It saves you
> duplicating code in a separate function like in your example.

Given the original read:

def fact(n):
    if n < 0: raise ValueError
    if n = 0: return 1
    return fact(n-1)*n

You've merely replaced the 'test n<0' with 'not check' at the expense
of an additional parameter that has to be passed each time (and the
additional test 'n<0' for the first iteration).


From michele.simionato at gmail.com  Tue Feb 10 23:52:37 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 10 Feb 2009 20:52:37 -0800 (PST)
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com> 
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com> 
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com> 
	<mailman.9200.1234236604.3487.python-list@python.org>
	<2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>
	<mailman.9210.1234253991.3487.python-list@python.org>
Message-ID: <5175fb80-f01d-448f-99c7-ebbb60aa0011@a12g2000yqm.googlegroups.com>

On Feb 10, 9:19?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> You really should push them to be included in python.org, even in their ?
> unfinished form. (At least a link in the wiki pages). Their visibility is ?
> almost null now.

It looks like I made an unfortunate choice with the
title ("Things to Know about Super"). I have just changed
it to "Things to Know about *Python* Super" so that now
googling for "python super" should hopefully find them.

I agree that the real solution would be to publish on python.org, but
for that I have to write yet another paper about Python 3.0 super, cut
things about old version/bugs of Python, re-read the whole beast, and
convince the core developers to publish it (which is not automatic).
That is some work, and I have many other projects going on right now.
Truth is, discussions about super do not come out so often, and most
people don't care.

> They're very clearly written - I wish you had published them years ago!

Me too, but you know what happens when working for free and without
deadlines ;)

> again, you really should publish the ?
> series in a more prominent place.

Soon or later I will go back to super in Python 3.0, but now I am
working on my Scheme series, I have yet to translate two articles of
my "Mixins considered harmful" series, and I have at least two other
articles which has been waiting publication for more than one year.
Plus, I have a full time job ;)
But if you and others keep bugging me something may happen ...

               Michele Simionato


From prologic at shortcircuit.net.au  Tue Feb 10 23:57:26 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Wed, 11 Feb 2009 14:57:26 +1000
Subject: can multi-core improve single funciton?
In-Reply-To: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
References: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
Message-ID: <e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:21 PM, oyster <lepto.python at gmail.com> wrote:
> My real purpose is to know "whether multi-core can help to improve the
> speed of a common function". But I know definitely that the answer is
> NO.

As stated by others, and even myself,
it is not possible to just "automagically"
improve the execution speed of a single
function - let alone an application.

Your problem must be capable of being divided up
into work units that can be parallelized. If this is not
possible, multiple cores (no matter how many you have)
-will not- help you.

cheers
James


From clp2 at rebertia.com  Wed Feb 11 00:01:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 21:01:53 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>
References: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
	<e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>
Message-ID: <50697b2c0902102101n4ff52d0fq8a6db73b9cbfb387@mail.gmail.com>

On Tue, Feb 10, 2009 at 8:57 PM, James Mills
<prologic at shortcircuit.net.au> wrote:
> On Wed, Feb 11, 2009 at 2:21 PM, oyster <lepto.python at gmail.com> wrote:
>> My real purpose is to know "whether multi-core can help to improve the
>> speed of a common function". But I know definitely that the answer is
>> NO.
>
> As stated by others, and even myself,
> it is not possible to just "automagically"
> improve the execution speed of a single
> function - let alone an application.
>
> Your problem must be capable of being divided up
> into work units that can be parallelized. If this is not
> possible, multiple cores (no matter how many you have)
> -will not- help you.

See also Amdahl's Law -- http://en.wikipedia.org/wiki/Amdahl%27s_law

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 00:07:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 03:07:31 -0200
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
	<1234301147.8528.47.camel@localhost.localdomain>
Message-ID: <op.uo58itxvx6zn5v@gabriel2.softlabbsas.com.ar>

On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:

>> The thing I don't understand is why a generator that has no iterable
>> values is different from an empty list. Why shouldn't bool ==
>> has_value?? Technically a list, a tuple, and a string are also objects
>> but if they lack values they're evaluated as False. It seems to me that
>> a generator is an object that intends to replace lists where lazy
>> evaluation would be more efficent. Here is one place where that's
>> definitely true.

Just in case it's not perfectly clear: until you call next() there is no  
way to know whether the generator will yield any value or not -- and once  
it does, it's lost until you explicitely save it.

This generator doesn't yield any value - but you have to wait for a while  
if you call .next() on it, until eventually raises StopIteration:
(x for x in xrange(2000000000) if x>100000000000)


En Tue, 10 Feb 2009 19:25:47 -0200, Albert Hopkins  
<marduk at letterboxes.org> escribi?:

>> The main reason I'm interested in this is that it improves performance
>> immensely over boolean evaluation of large lists (as the attached code
>> shows). It seems to me if I could use find a good use for it in my
>> experimentation that someone else might also want to do the same thing
>> in real-world code.
>
> I don't understand what you mean by this.  But if you really want to
> know if a generator is "non-empty":
>
> def non_empty(virgin_generator):
>     try:
>         virgin_generator.next() # note you just lost the first value
>         return True
>     except StopIteration:
>         return False
>
> The only way to get around this is to put all the values of a generator
> inside a container (e.g. a list):

For a long generator you may not want to do that, also you may not want to  
lose the next element. A variation of your function above is useful in  
such cases:

py> def end_of_gen(g):
...   """returns (False, next_element) when it exists or (True, None) when  
it's
empty"""
...   try: return False, g.next()
...   except StopIteration: return True, None
...
py> g = (c for c in "Python" if c in "aeiou")
py> eog, c = end_of_gen(g)
py> eog
False
py> c
'o'
py> eog, c = end_of_gen(g)
py> eog
True
py> c


-- 
Gabriel Genellina



From ntwrkd at gmail.com  Wed Feb 11 00:36:00 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 21:36:00 -0800
Subject: getopt
In-Reply-To: <e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
References: <mailman.9296.1234314769.3487.python-list@python.org>
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
Message-ID: <f257b9ab0902102136y5047e6b2y75ee57572162dee2@mail.gmail.com>

The documentation leaves lack for want, especially the examples.

On Tue, Feb 10, 2009 at 5:25 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 12:12 pm, Matthew Sacks <ntw... at gmail.com> wrote:
>> if anyone can have a look at this code and offer suggestions i would
>> appreciate it.
>> i am forced to use getopt, so i cant use something good like optparse
>>
>> passedArgs = sys.argv[1:]
>> optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
>
> Dunno where you acquired the str() ... just lose it. Consider checking
> with the documentation when something "does not work".
>
>> "adminServerURL=", "action=", "targets=", "appDir="])
>>
>> for some reason this does not work in assigning args to opts.
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From http  Wed Feb 11 00:51:00 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 21:51:00 -0800
Subject: can multi-core improve single funciton?
References: <mailman.9305.1234326077.3487.python-list@python.org>
Message-ID: <7xhc31o723.fsf@ruckus.brouhaha.com>

oyster <lepto.python at gmail.com> writes:
> Hi, guys, my fib(xx) is just an example to show "what is a single
> function" and "what is the effect I expect to see when enable
> multi-core".
> 
> My real purpose is to know "whether multi-core can help to improve
> the speed of a common function". But I know definitely that the
> answer is NO.

Well, it depends on the implementation.  Python isn't at the moment
designed for using multicores but as it evolves that may change.

The blog post http://cgi.cse.unsw.edu.au/~dons/blog/2007/11/29
may be of interest re parallelizing that fibonacci function.


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 00:52:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 03:52:56 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
Message-ID: <op.uo6amilsx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 00:31:26 -0200, <mark.seagoe at gmail.com> escribi?:

> I like the ability to access elements of a struct such as with ctypes
> Structure:
>>>> myStruct.elementName1
> 4
>
> What I like about it is there are no quotes needed.
>
> What I don't like about it is that it's not iterable:
>>>> for n in myStruct:  <== gives error
>>>>    print n
>
> I don't want to force the end user to have preknowledge of the element
> names.

Note that those names are available as the _fields_ class attribute

> Has anyone subclassed ctypes Structure based class to be iterable?
> Before a noob starts trying to do this, is it possible?  How to
> approach it?

The easiest way would be to define __getitem__ accepting index 0, 1, 2...  
until the last defined field.
See http://docs.python.org/reference/datamodel.html#object.__getitem__

<code>
 from ctypes import Structure

class IterableStructure(Structure):
   def __getitem__(self, i):
     if not isinstance(i, int):
       raise TypeError('subindices must be integers: %r' % i)
     return getattr(self, self._fields_[i][0])

</code>

This was tested as much as you see here:

py> from ctypes import c_int
py>
py> class POINT(IterableStructure):
...     _fields_ = [("x", c_int),
...                 ("y", c_int)]
...
py> point = POINT(10, 20)
py> print point.x, point.y
10 20
py> for field in point:
...   print field
...
10
20
py> print list(point)
[10, 20]

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Wed Feb 11 00:54:25 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 21:54:25 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
Message-ID: <531416d0-9396-4804-a5be-184c224edb60@d36g2000prf.googlegroups.com>

On Feb 11, 12:25?pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 11, 12:12?pm, Matthew Sacks <ntw... at gmail.com> wrote:
>
> > if anyone can have a look at this code and offer suggestions i would
> > appreciate it.
> > i am forced to use getopt, so i cant use something good like optparse
>
> > passedArgs = sys.argv[1:]
> > optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
>
> Dunno where you acquired the str() ... just lose it. Consider checking
> with the documentation when something "does not work".

Rule 2: read further in the documentation than you think you need
to :-)

You have omitted the second arg, the one that defines short options.
As for the second part of your question, assigning to locals is
tedious as you have found. The classical solution is to jam the
options into an object that acts like a 'record' or a 'struct'.
Another possibility is the newfangled 'named tuple'. The following
illustrates working code for getting your optlist going, and using the
'record' idea. Keep on going (next step: add a function for each arg
that will convert the value from str to int/float/bool/etc as/if
appropriate) and you will have rewritten optparse.

HTH,
John

================
C:\junk>type getopt_demo.py
import getopt, sys
long_arg_defns = { # sets up defaults
    "cp":  None,
    "asu": "xyzzy",
    "act": "do_nothing",
    "tgts":"",
    "ad": 1.23,
}
long_arg_list = [x + '=' for x in long_arg_defns.keys()]
passedArgs = sys.argv[1:]
print 'passedArgs', passedArgs

print '\nattempt 1'
try:
    optlist, args = getopt.getopt(str(passedArgs), long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

print '\nattempt 2'
try:
    optlist, args = getopt.getopt(passedArgs, long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

print '\nattempt 3'
try:
    optlist, args = getopt.getopt(passedArgs, '', long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

class Record(object):

    def __init__(self, initial_dict, optlist):
        for attr, default in initial_dict.items():
            setattr(self, attr, default)
        for attr, value in optlist:
            setattr(self, attr.lstrip('-'), value)

    def __str__(self):
        return "<Record: %s>" % self.__dict__

r = Record(long_arg_defns, optlist)
print
print r
print
print r.cp, r.act, r.ad


C:\junk>getopt_demo.py --cp xxxcp --ad yyyyyad extra1 extra2
passedArgs ['--cp', 'xxxcp', '--ad', 'yyyyyad', 'extra1', 'extra2']

attempt 1
[] ['--cp', 'xxxcp', '--ad', 'yyyyyad', 'extra1', 'extra2']

attempt 2
GetoptError: option --cp not recognized

attempt 3
[('--cp', 'xxxcp'), ('--ad', 'yyyyyad')] ['extra1', 'extra2']

<Record: {'tgts': '', 'cp': 'xxxcp', 'ad': 'yyyyyad', 'asu': 'xyzzy',
'act': 'do _nothing'}>

xxxcp do_nothing yyyyyad

C:\junk>


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 01:09:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 04:09:50 -0200
Subject: python3 tutorial for newbie
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
Message-ID: <op.uo6beobyx6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 16:22:36 -0200, Gary Wood <pythonsky at sky.com> escribi?:

> Can someone recommend a good tutorial for Python 3, ideally that has  
> tasks or assignments at the end of each chapter.

I don't know of any specifically targetted to Python 3, except the  
official one at http://www.python.org/doc/3.0/

For the most part, any Python tutorial should be fine. Perhaps the only  
visible change (at the tutorial level) is that "print" became a function:

# 2.x syntax:
print "Hello", "world!"

# 3.x syntax:
print("Hello", "world!")

That said, Python 3.0 is so recent that isn't widely used yet, and many  
third party libraries aren't available for 3.0 at this moment. This  
certainly will change in the future, but in the meantime, perhaps you  
should stick to Python 2.6 for a while.

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Wed Feb 11 01:36:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 22:36:40 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com> 
	<mailman.9310.1234330563.3487.python-list@python.org>
Message-ID: <3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>

On Feb 11, 4:36?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> The documentation leaves lack for want, especially the examples.

You had two problems:

(1) str(passedArgs): The docs make it plain that "args" is a list, not
a str instance: """args is the argument list to be parsed, without the
leading reference to the running program. Typically, this means
sys.argv[1:]""". The 1st and 2nd examples spell out the same story;
here's the 2nd:
"""
 Using long option names is equally easy:
 >>> s = '--condition=foo --testing --output-file abc.def -x a1 a2'
 >>> args = s.split()
 >>> args
 ['--condition=foo', '--testing', '--output-file', 'abc.def', '-x',
'a1', 'a2']
"""

(2) omitting the *required* options arg: (a) it's not wrapped in [] so
it's required (b) the docs say """To accept only long options, options
should be an empty string."""

IOW, it may "leave lack for want", but not in the areas causing you a
bother.


From kamath86 at gmail.com  Wed Feb 11 01:37:37 2009
From: kamath86 at gmail.com (kamath86 at gmail.com)
Date: Tue, 10 Feb 2009 22:37:37 -0800 (PST)
Subject: Browse Dialog
Message-ID: <435cced2-53bc-47a1-86a9-b8ac9bb7415a@p13g2000yqc.googlegroups.com>

Hi ,

I am using TKinter for creating a GUI. As of now i am using
tkFileDialog module for selection of file/directory.But i see that i
can use either of these at one go.Is there a way i can select a file
or a directory through a single dialog box??


From arunasunil at gmail.com  Wed Feb 11 01:43:24 2009
From: arunasunil at gmail.com (arunasunil at gmail.com)
Date: Tue, 10 Feb 2009 22:43:24 -0800 (PST)
Subject: Programmatically changing network proxy settings on the Mac
Message-ID: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>

Hi,

Anybody have suggestions of how network proxy settings can be changed
programmatically on the Mac, Tiger and Leopard. Are there any helpful
python api's that can be used.

Thanks
Sunil


From akitada at gmail.com  Wed Feb 11 01:46:44 2009
From: akitada at gmail.com (Akira Kitada)
Date: Wed, 11 Feb 2009 15:46:44 +0900
Subject: python3 tutorial for newbie
In-Reply-To: <920577A6E319438A9397A41B74AE9913@Woodygar>
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
Message-ID: <90bb445a0902102246n65d1d33ej3f2ff0a1867253dc@mail.gmail.com>

http://wiki.python.org/moin/Python3.0Tutorials

On Wed, Feb 11, 2009 at 3:22 AM, Gary Wood <pythonsky at sky.com> wrote:
> Can someone recommend a good tutorial for Python 3, ideally that has tasks
> or assignments at the end of each chapter.
> Please,
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From ntwrkd at gmail.com  Wed Feb 11 01:46:48 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 22:46:48 -0800
Subject: getopt
In-Reply-To: <3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
References: <mailman.9296.1234314769.3487.python-list@python.org>
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
	<mailman.9310.1234330563.3487.python-list@python.org>
	<3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902102246y3db0b6eco44cba9629c688d87@mail.gmail.com>

I didn't realize that the no-value arguments, -b, -h, etc are required?
This seems to make things a bit more difficult considering unless I
use the GNU style getopt all arguments are required to be passed?

I could be mistaken.

I will have a look at what you have posted here and report my results.
I appreciate the response.

M

On Tue, Feb 10, 2009 at 10:36 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 4:36 pm, Matthew Sacks <ntw... at gmail.com> wrote:
>> The documentation leaves lack for want, especially the examples.
>
> You had two problems:
>
> (1) str(passedArgs): The docs make it plain that "args" is a list, not
> a str instance: """args is the argument list to be parsed, without the
> leading reference to the running program. Typically, this means
> sys.argv[1:]""". The 1st and 2nd examples spell out the same story;
> here's the 2nd:
> """
>  Using long option names is equally easy:
>  >>> s = '--condition=foo --testing --output-file abc.def -x a1 a2'
>  >>> args = s.split()
>  >>> args
>  ['--condition=foo', '--testing', '--output-file', 'abc.def', '-x',
> 'a1', 'a2']
> """
>
> (2) omitting the *required* options arg: (a) it's not wrapped in [] so
> it's required (b) the docs say """To accept only long options, options
> should be an empty string."""
>
> IOW, it may "leave lack for want", but not in the areas causing you a
> bother.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Wed Feb 11 01:57:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 22:57:18 -0800
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <Rt6dnXPTkcLN6w_UnZ2dnUVZ_iyWnZ2d@pdx.net>

Steven D'Aprano wrote:
> I sometimes write recursive functions like this simple factorial:
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n 
> 
> At the risk of premature optimization, I wonder if there is an idiom for 
> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
> calls? For the sake of the argument, let's pretend the test is expensive 
> and I have a good reason for wanting to avoid it on subsequent calls :)
How about:

      def fact(n):
          if n < 2:
              if n < 0:
                  raise ValueError
              return 1
          return fact(n - 1) * n

But really, iteration is the solution to this, and avoiding the
right answer is a mistake.  I couldn't resist fixing your test
so you do one less layer of recursion.

--Scott David Daniels
Scott.Daniels at Acm.Org


From http  Wed Feb 11 02:41:18 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 23:41:18 -0800
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xeiy52zfl.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n 
> 
> At the risk of premature optimization, I wonder if there is an idiom for 
> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
> calls?

I'd write nested functions:

    def fact(n):
       if n < 0: raise ValueError
       def f1(n):
          return 1 if n==0 else n*f1(n-1)
       return f1(n)

If the language implementation supports tail recursion optimization
there's an accumulation-parameter style that takes a little getting
used to but is familiar in functional programming:

def fact(n):
    if n < 0: raise ValueError
    def f1(k,n):
       return k if n==0 else f1(k*n, n-1)
    return f1(1, n)

This won't do any good in CPython but maybe PyPy or Pyrex or whatever
can make use of it.  In this case the nested function is already
there, and the n<0 check naturally lifts out of it.


From http  Wed Feb 11 02:50:43 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 23:50:43 -0800
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
Message-ID: <7xbpt9h0oc.fsf@ruckus.brouhaha.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
> I'd write nested functions:
> 
>     def fact(n):
>        if n < 0: raise ValueError
>        def f1(n):
>           return 1 if n==0 else n*f1(n-1)
>        return f1(n)

I forgot to add: all these versions except your original one should
add a type check if you are trying to program defensively.  Otherwise
they can recurse infinitely if you give a positive non-integer arg like
fact(3.5).


From joelc at cognyx.com  Wed Feb 11 02:52:40 2009
From: joelc at cognyx.com (Joel Ross)
Date: Wed, 11 Feb 2009 18:52:40 +1100
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <01a1281b$0$7503$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code:
> #########################################################################
> 
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
> 
> 
> def readLines():
> 
>         for line in file.read():
>             if not line: break
>             print line + '.com '
>             return line
> 
> 
> 
> readLines()
> file.close()
> 
> ##########################################################################
> 
> It returns the results:
> 
> t.com
> 
> NOTE: Only returns the first letter of the first word on the first line 
> e.g. test would only print t and readline() does the same thing.
> 
> I have also tried readlines() which gives me the result:
> 
> test
> .com
> 
> The file Wordlist has one word on each line for example
> 
> test
> test1
> test2
> 
> I need it to loop though the Wordlist file and print/return the results
> 
> test.com
> test1.com
> test2.com
> 
> I'm just looking for a point in the right direction.
> 
> Much Thanks
> 
> JOelC


Thanks for the quick response guys. Help me out a alot. I'm a newbie to 
python and your replies help me understand a bit more about python!!

Thank You


From Ron.Barak at lsi.com  Wed Feb 11 02:58:59 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 11 Feb 2009 07:58:59 +0000
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>

[http://www.emofaces.com/en/emoticons/t/thumbs-up-emoticon.gif]

-----Original Message-----
From: D'Arcy J.M. Cain [mailto:darcy at druid.net]
Sent: Monday, February 09, 2009 20:21
To: todpose at hotmail.com
Cc: python-list at python.org
Subject: Re: Putting asterisks around text

On Mon, 9 Feb 2009 10:09:26 -0800
"todpose at hotmail.com" <todpose at hotmail.com> wrote:
> I'm trying to write a program that puts asterisks around the input text using while loop.
> I can do this without using while loop, but how can you do that using
> while loop?Example:Enter a string: Hello world***********Hello
> world***********

while understand_problem is False:
    study("textbook")

complete("homework")

if want_help is True:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

--
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.

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From greg.ewing at canterbury.ac.nz  Wed Feb 11 03:10:04 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Wed, 11 Feb 2009 21:10:04 +1300
Subject: ANN: SuPy for Python 2.5 on Windows
Message-ID: <mailman.9324.1234351171.3487.python-announce-list@python.org>

SuPy 1.0 - Windows
------------------

A Windows build for Python 2.5 is now available.

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From sjmachin at lexicon.net  Wed Feb 11 03:13:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 00:13:33 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com> 
	<mailman.9310.1234330563.3487.python-list@python.org>
	<3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
	<mailman.9314.1234334818.3487.python-list@python.org>
Message-ID: <6f4e83b3-7c0f-4572-868f-7dafd769a3d3@r15g2000prd.googlegroups.com>

On Feb 11, 5:46?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> I didn't realize that the no-value arguments, -b, -h, etc are required?

required sense 1: the 2nd arg of the function is required; if there
are to be no short options, the 2nd arg should be an empty string.

required sense 2: you are required to specify *all* short options that
you will accept, whether they are no-value or value options; otherwise
you would have to do your own checking for unacceptable options

> This seems to make things a bit more difficult considering unless I
> use the GNU style getopt all arguments are required to be passed?

What does "all arguments are required to be passed" mean? The user is
not required to supply an arg corresponding to any option. Options are
optional!

GNU? Change getopt.getopt to getopt.gnu_getopt and you still get an
exception like "GetoptError: option -b not recognized" if -b is not
defined in the 2nd arg of [gnu_]getopt. AFAICT the GNU difference is
only the documented different treatment of an arg string like "-a1 -b
bvalue stray -c -d" ... non-Gnu treats -c and -d the same as stray.

> I will have a look at what you have posted here and report my results.

Just bear in mind that it was written under the assumption that you
weren't plannning to use short options at all; your examples left lack
for want.

Cheers,
John


From lists at cheimes.de  Wed Feb 11 03:26:31 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 11 Feb 2009 09:26:31 +0100
Subject: Escaping my own chroot...
In-Reply-To: <muednbIYVNVU-w_UnZ2dnUVZ_q3inZ2d@earthlink.com>
References: <gmt446$fq0$1@aioe.org>
	<muednbIYVNVU-w_UnZ2dnUVZ_q3inZ2d@earthlink.com>
Message-ID: <49928BB7.2020406@cheimes.de>

Dennis Lee Bieber schrieb:
> 	That's the whole purpose of chroot()... As far as the process is
> concerned, the chroot() path is now the top of the file system, so there
> is no where above it you can get to...

Yes, you can get with some hacks.

> chroot() is meant for cases where one may be running a server or such
> that should not permit any outside hacks from reaching above its level.
> Typically one creates a minimal environment of just those commands and
> programs needed by users of the server -- you remove anything that
> offers privileged ability.
> 
> chdir() would be used to change the current directory of the process, so
> any spawned commands would operate in the new directory by default

chroot() must not be understood as a security mechanism like BSD's jail.
   A process can still access resources outside the chroot. Unless the
process drops it's root privileges with setuid() ASAP the process can
escape the chroot'ed environment, too.

chroot() can help with increasing security but it's not bullet proof. By
the way it's a bad idea to mount proc and sys inside a chroot ...

Christian


From castironpi at gmail.com  Wed Feb 11 03:41:39 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 11 Feb 2009 00:41:39 -0800 (PST)
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <d9c70507-f0ea-46da-bdca-e2170210e970@r15g2000prh.googlegroups.com>

On Feb 10, 7:58?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> I sometimes write recursive functions like this simple factorial:
>
> def fact(n):
> ? ? if n < 0: raise ValueError
> ? ? if n = 0: return 1
> ? ? return fact(n-1)*n
>
> At the risk of premature optimization, I wonder if there is an idiom for
> avoiding the unnecessary test for n <= 0 in the subsequent recursive
> calls? For the sake of the argument, let's pretend the test is expensive
> and I have a good reason for wanting to avoid it on subsequent calls :)
>
> I've done this:
>
> def _fact(n):
> ? ? if n = 0: return 1
> ? ? return _fact(n-1)*n
>
> def fact(n):
> ? ? if n < 0: raise ValueError
> ? ? return _fact(n)
>
> but that's ugly. What else can I do?
>
> --
> Steven

Build a list of function calls, and just replace the base case with a
terminating call.

>>> def f( n ):
...     def rec( i ):
...             return i* funcs[ i- 1 ]( i- 1 )
...     def base( i ):
...             return 1
...     funcs= [ rec ]* n
...     funcs[ 0 ]= base
...     return rec( n )
...
>>> f( 5 )
120
>>> f( 6 )
720
>>> f( 1 )
1


From ksterling at mindspring.com  Wed Feb 11 04:10:31 2009
From: ksterling at mindspring.com (Ken)
Date: Wed, 11 Feb 2009 04:10:31 -0500
Subject: python3 tutorial for newbie
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
	<mailman.9312.1234332608.3487.python-list@python.org>
Message-ID: <9f-dnVeRM-SVCw_UnZ2dnUVZ_v7inZ2d@earthlink.com>


"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote in message 
news:mailman.9312.1234332608.3487.python-list at python.org...
> En Tue, 10 Feb 2009 16:22:36 -0200, Gary Wood <pythonsky at sky.com> 
> escribi?:
>
>> Can someone recommend a good tutorial for Python 3, ideally that has 
>> tasks or assignments at the end of each chapter.
>
> I don't know of any specifically targetted to Python 3, except the 
> official one at http://www.python.org/doc/3.0/
>
> For the most part, any Python tutorial should be fine. Perhaps the only 
> visible change (at the tutorial level) is that "print" became a function:
>
> # 2.x syntax:
> print "Hello", "world!"
>
> # 3.x syntax:
> print("Hello", "world!")
>
> That said, Python 3.0 is so recent that isn't widely used yet, and many 
> third party libraries aren't available for 3.0 at this moment. This 
> certainly will change in the future, but in the meantime, perhaps you 
> should stick to Python 2.6 for a while.
>
> -- 
> Gabriel Genellina

Several links here:

http://wiki.python.org/moin/Python3.0Tutorials
> 




From jef.mangelschots at gmail.com  Wed Feb 11 04:24:17 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Wed, 11 Feb 2009 01:24:17 -0800 (PST)
Subject: import wx works interactive but not from script
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
	<mailman.9215.1234257018.3487.python-list@python.org>
	<35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
	<mailman.9241.1234283966.3487.python-list@python.org>
Message-ID: <0a313a42-bfd9-4f2e-b16c-ffb82d3ae2a1@o2g2000prl.googlegroups.com>

ok, sorry for the long wait.
I tried this on both my work (XP) and home PC (Vista64) and they are
both consistent.

I had both Python2.6 and Python 3.0 installed.
wxPython didn't like that.
As soon as I uninstalled Python3.0, my wxPython started running again.
Must be some kind of registry thing.

Thanks for the suggestion.


From tjreedy at udel.edu  Wed Feb 11 04:31:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 04:31:10 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <7xeiy52zfl.fsf@ruckus.brouhaha.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
Message-ID: <gmu5sr$t8q$1@ger.gmane.org>


> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> def fact(n):
>>     if n < 0: raise ValueError
>>     if n = 0: return 1
>>     return fact(n-1)*n 
>>
>> At the risk of premature optimization, I wonder if there is an idiom for 
>> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
>> calls?

Reverse the test order

def fact(n):
     if n > 0: return fact(n-1)*n
     if n == 0: return 1
     raise ValueError

You must test recursive versus terminal case every call in any case.
Nearly always, the first test passes and second is not done.
You only test n==0 once, either to terminate or raise exception.
This works for any integral value and catches non-integral values. 
(There is some delay for that, but only bad calls are penalized.)

Terry Jan Reedy



From jervisau at gmail.com  Wed Feb 11 04:31:25 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 20:31:25 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<mailman.9300.1234320496.3487.python-list@python.org>
	<a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
Message-ID: <8e63a5ce0902110131m78a996f0l62df13e602489cd0@mail.gmail.com>

> You've merely replaced the 'test n<0' with 'not check' at the expense
> of an additional parameter that has to be passed each time (and the
> additional test 'n<0' for the first iteration).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
I think you have missed the point. The OP stated that n<0 could stand
for an expensive
operation, this replaces an expensive check every time with a cheaper
one every time.

I like the idea of the interface that was in the original post.

Cheers,


From jervisau at gmail.com  Wed Feb 11 04:32:44 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 20:32:44 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<mailman.9300.1234320496.3487.python-list@python.org>
	<a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
Message-ID: <8e63a5ce0902110132l6c092d1eyc4068e381f3c0069@mail.gmail.com>

>
> You've merely replaced the 'test n<0' with 'not check' at the expense
> of an additional parameter that has to be passed each time (and the
> additional test 'n<0' for the first iteration).
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I think you have missed the point. The OP stated that n<0 could stand
for an expensive
operation, this replaces an expensive check every time with a cheaper
one every time.

I like the idea of the interface that was in the original post.

Cheers,


From Scott.Daniels at Acm.Org  Wed Feb 11 04:43:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 01:43:43 -0800
Subject: zlib interface semi-broken
In-Reply-To: <mailman.9287.1234307540.3487.python-list@python.org>
References: <mailman.9266.1234299464.3487.python-list@python.org>	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
Message-ID: <Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>

Travis wrote:
> On Tue, Feb 10, 2009 at 01:36:21PM -0800, Scott David Daniels wrote:
>> .... I personally would like it and bz2 to get closer to each other...
> 
> Well, I like this idea; perhaps this is a good time to discuss the
> equivalent of some "abstract base classes", or "interfaces", for
> compression.
> 
> As I see it, the fundamental abstractions are the stream-oriented
> de/compression routines.  Given those, one should easily be able to
> implement one-shot de/compression of strings.  In fact, that is the
> way that zlib is implemented; the base functions are the
> stream-oriented ones and there is a layer on top of convenience
> functions that do one-shot compression and decompression.

There are a couple of things here to think about.  I've wanted to
do some low-level (C-coded) search w/o bothering to create strings
until a match.  I've no idea how to push this down in, but I may be
looking for a nice low-level spot to fit.  Characteristics for that
could be read-only access to small expansion parts w/o copying them
out.  Also, in case of a match, a (relatively quick) way to mark points
as we proceed and a (possibly slower) way to resrore from one or
more marked points.

Also, another programmer wants to parallelize _large_ bzip file
expansion by expanding independent blocks in separate threads (we
know how to find safe start points).  To get such code to work, we
need to find big chunks of computation, and (at least optionally)
surround them with GIL release points.

> So what I suggest is a common framework of three APIs; a sequential
> compression/decompression API for streams, a layer (potentially
> generic) on top of those for strings/buffers, and a third API for
> file-like access.  Presumably the file-like access can be implemented
> on top of the sequential API as well.
If we have to be able to start from arbitrary points in bzip files, they
have one nasty characteristic: they are bit-serial, and we'll need to
start them at arbitrary _bit_ points (not simply byte boundaries).

One structure I have used for searching is a result iterator fed by
a source iterator, so rather than a read w/ inconvenient boundaries
the input side of the thing calls the 'next' method of the provided
source.

> ... I would rather see a pythonic interface to the libraries than a
 > simple-as-can-be wrapper around the C functions....
I'm on board with you here.

> My further suggestion is that we start with the sequential
> de/compression, since it seems like a fundamental primitive.
> De/compressing strings will be trivial, and the file-like interface is
> already described by Python.
Well, to be explicit, are we talking about Decompresion and Compression
simultaneously or do we want to start with one of them first?

> 2) The de/compression object has routines for reading de/compressed
> data and states such as end-of-stream or resynchronization points as
> exceptions, much like the file class can throw EOFError.  My problem
> with this is that client code has to be cognizant of the possible
> exceptions that might be thrown, and so one cannot easily add new
> exceptions should the need arise.  For example, if we add an exception
> to indicate a possible resynchronization point, client code may not
> be capable of handling it as a non-fatal exception.

Seems like we may want to say things like, "synchronization points are
too be silently ignored."

--Scott David Daniels
Scott.Daniels at Acm.Org


From robince at gmail.com  Wed Feb 11 04:50:04 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 01:50:04 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
Message-ID: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>

Hi,

I am building some computational web services using soaplib. This
creates a WSGI application.

However, since some of these services are computationally intensive,
and may be long running, I was looking for a way to use multiple
processes. I thought about using multiprocessing.Process manually in
the service, but I was a bit worried about how that might interact
with a threaded server (I was hoping the thread serving that request
could just wait until the child is finished). Also it would be good to
keep the services as simple as possible so it's easier for people to
write them.

I have at the moment the following WSGI structure:
TransLogger(URLMap(URLParser(soaplib objects)))
although presumably, due to the beauty of WSGI, this shouldn't matter.

As I've found with all web-related Python stuff, I'm overwhelmed by
the choice and number of alternatives. I've so far been using cherrypy
and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
What would be the simplest [quickest to setup and fewest details of
the server required - ideally with a simple example] and most reliable
[this will eventually be 'in production' as part of a large scientific
project] way to host this sort of WSGI with a process-per-request
style?

Thanks!

Robin



From thorsten at thorstenkampe.de  Wed Feb 11 04:55:01 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 11 Feb 2009 10:55:01 +0100
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
Message-ID: <MPG.23fcbee11990ceb19897c0@news.individual.de>

* Richard Gruet (Tue, 10 Feb 2009 20:38:24 +0100)
> The Python 2.6 Quick Reference is available in HTML and PDF formats at
> http://rgruet.free.fr/#QuickRef.

THANK YOU!

Thorsten


From ramesh.nrk at gmail.com  Wed Feb 11 04:56:19 2009
From: ramesh.nrk at gmail.com (nRk)
Date: Wed, 11 Feb 2009 01:56:19 -0800 (PST)
Subject: urllib2.Request:: http Request sending successfully, but Response 
	contains in valid data.
Message-ID: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>

Hi

I am trying to send Data to a website through "http" using
"urllib.request" library using the bellow code.
Response status code contains. 200 (OK) but Response contains
nothing...

With same data When I test using C# it working fine.. Response
having.. some data in xml format.
But I am using below python code i am getting response only "<HTML></
HTML>".

Is there any in my code..

 req  = urllib2.Request(url) // url is valid url
 req.add_header('Authorization','AuthSub token="xxxxxxxxxxxxx"')
 req.add_header('Content-Type','application/atom+xml')
 req.data=data  // data is having valid xml data
 r = urllib2.urlopen(req)

print(r.code) // output 200
print(r.msg) // output OK
print(r.read()) //<HTML></HTML>


From andrew at acooke.org  Wed Feb 11 04:58:54 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 06:58:54 -0300 (CLST)
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <gmu5sr$t8q$1@ger.gmane.org>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com> <gmu5sr$t8q$1@ger.gmane.org>
Message-ID: <1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>

Terry Reedy wrote:
> Reverse the test order
>
> def fact(n):
>      if n > 0: return fact(n-1)*n
>      if n == 0: return 1
>      raise ValueError

sweet!  but is this generally possible?  ie: did you think this up for
this question or is it an idiom that you find yourself using often?

andrew



From piet at cs.uu.nl  Wed Feb 11 05:12:06 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 11 Feb 2009 11:12:06 +0100
Subject: Distributing simple tasks
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
Message-ID: <m2r625uvt5.fsf@cp1336376-a.venlo1.lb.home.nl>

Noam Aigerman wrote:
> Hi,
> 
> Suppose I have an array of functions which I execute in threads (each
> thread get a slice of the array, iterates over it and executes each
> function in it?s slice one after the other). Now I want to distribute
> these tasks between two machines, i.e give each machine half of the
> slices and let it run them in threads as described above. Is there an
> easy way, or an article on this matter you can point me to?

Have a look at MapReduce (google for MapReduce Python).
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From http  Wed Feb 11 05:17:20 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 02:17:20 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
Message-ID: <7xskml9t1r.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> Seems like we may want to say things like, "synchronization points are
> too be silently ignored."

That would completely break some useful possible applications, so should
be avoided.


From greg at cosc.canterbury.ac.nz  Wed Feb 11 05:41:22 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Wed, 11 Feb 2009 23:41:22 +1300
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <6vfo6kFjlnteU1@mid.individual.net>

Aaron Brady wrote:

> It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?

No. This requirement clearly indicates that send() is
the wrong tool for the job.

I would use a class with a generator as a method, e.g.

   class Multiples:

     m = 1

     def set_multiplier(self, m):
       self.m = m

     def generate(self, limit):
       for i in xrange(limit):
         yield i * self.m

   g = Multiples()
   for x in g.generate(10):
     print x
     if x == 3:
       g.set_multiplier(42)

produces

0
1
2
3
168
210
252
294
336
378

-- 
Greg


From christopher.saunter at durham.ac.uk  Wed Feb 11 06:06:31 2009
From: christopher.saunter at durham.ac.uk (c d saunter)
Date: Wed, 11 Feb 2009 11:06:31 +0000 (UTC)
Subject: Unexpected string behaviour: txt = 'this' ' works'
Message-ID: <gmubfn$a28$1@heffalump.dur.ac.uk>

I did a double take when debugging an error the other day.  My
problem was missing out a comma when building a list of strings.

Much to my surprise the offending code still executed to cause
problems later on:

>>> txt = 'this', 'works'
>>> print txt
('this', 'works')
# As expected
>>> txt = 'this' 'works'
>>> print txt
thisworks
# Eh?

I have never seen this behaviour before, but it works in Python 2.2.1
and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
of the compiler.

Any thoughts?
Regards
Chris





From qgallet at gmail.com  Wed Feb 11 06:21:29 2009
From: qgallet at gmail.com (Quentin Gallet-Gilles)
Date: Wed, 11 Feb 2009 12:21:29 +0100
Subject: Unexpected string behaviour: txt = 'this' ' works'
In-Reply-To: <gmubfn$a28$1@heffalump.dur.ac.uk>
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <8b943f2b0902110321t40b44567l8050968534787955@mail.gmail.com>

*Literal* string concatenation has always been a part of Python :
http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation


On Wed, Feb 11, 2009 at 12:06 PM, c d saunter <
christopher.saunter at durham.ac.uk> wrote:

> I did a double take when debugging an error the other day.  My
> problem was missing out a comma when building a list of strings.
>
> Much to my surprise the offending code still executed to cause
> problems later on:
>
> >>> txt = 'this', 'works'
> >>> print txt
> ('this', 'works')
> # As expected
> >>> txt = 'this' 'works'
> >>> print txt
> thisworks
> # Eh?
>
> I have never seen this behaviour before, but it works in Python 2.2.1
> and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
> of the compiler.
>
> Any thoughts?
> Regards
> Chris
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From greg at cosc.canterbury.ac.nz  Wed Feb 11 06:23:39 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 12 Feb 2009 00:23:39 +1300
Subject: python is great
In-Reply-To: <495fd1f5$0$18383$ba4acef3@news.orange.fr>
References: <14fa3ad88c5cff33fb4e81deb89ba835@dizum.com>
	<495fd1f5$0$18383$ba4acef3@news.orange.fr>
Message-ID: <6vfqlqFjnknkU1@mid.individual.net>

>> python is great.
> 
> No.
> 
> Python is VERY GREAT !!!!!!!

All right now, everyone...

   Every Python's sacred, every Python's great,
   If any Python's wasted, Guido gets irate!

-- 
Greg


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 11 06:23:57 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 11 Feb 2009 12:23:57 +0100
Subject: Unexpected string behaviour: txt = 'this' ' works'
In-Reply-To: <gmubfn$a28$1@heffalump.dur.ac.uk>
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <4992b53f$0$3507$426a74cc@news.free.fr>

c d saunter a ?crit :
> I did a double take when debugging an error the other day.  My
> problem was missing out a comma when building a list of strings.
> 
> Much to my surprise the offending code still executed to cause
> problems later on:
> 
>>>> txt = 'this', 'works'
>>>> print txt
> ('this', 'works')
> # As expected
>>>> txt = 'this' 'works'
>>>> print txt
> thisworks
> # Eh?
>
> I have never seen this behaviour before, but it works in Python 2.2.1
> and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
> of the compiler.
> 
> Any thoughts?

http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation


From christopher.saunter at durham.ac.uk  Wed Feb 11 06:26:36 2009
From: christopher.saunter at durham.ac.uk (c d saunter)
Date: Wed, 11 Feb 2009 11:26:36 +0000 (UTC)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<4992b53f$0$3507$426a74cc@news.free.fr>
Message-ID: <gmuclc$alg$1@heffalump.dur.ac.uk>

Bruno Desthuilliers (bruno.42.desthuilliers at websiteburo.invalid) wrote:
: c d saunter a ?crit :
: > I did a double take when debugging an error the other day.  My
: > problem was missing out a comma when building a list of strings.
: > 
: > Much to my surprise the offending code still executed to cause
: > problems later on:
: > 
: >>>> txt = 'this', 'works'
: >>>> print txt
: > ('this', 'works')
: > # As expected
: >>>> txt = 'this' 'works'
: >>>> print txt
: > thisworks
: > # Eh?
: >
: > I have never seen this behaviour before, but it works in Python 2.2.1
: > and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
: > of the compiler.
: > 
: > Any thoughts?

: http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation

Ahh.  Thanks.

Chris


From robin at reportlab.com  Wed Feb 11 07:10:47 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 12:10:47 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
Message-ID: <4992C047.3060306@chamonix.reportlab.co.uk>

Robin wrote:
> Hi,
> 
> I am building some computational web services using soaplib. This
> creates a WSGI application.
> 
> However, since some of these services are computationally intensive,
> and may be long running, I was looking for a way to use multiple
> processes. I thought about using multiprocessing.Process manually in
> the service, but I was a bit worried about how that might interact
> with a threaded server (I was hoping the thread serving that request
> could just wait until the child is finished). Also it would be good to
> keep the services as simple as possible so it's easier for people to
> write them.
> 
> I have at the moment the following WSGI structure:
> TransLogger(URLMap(URLParser(soaplib objects)))
> although presumably, due to the beauty of WSGI, this shouldn't matter.
> 
> As I've found with all web-related Python stuff, I'm overwhelmed by
> the choice and number of alternatives. I've so far been using cherrypy
> and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> What would be the simplest [quickest to setup and fewest details of
> the server required - ideally with a simple example] and most reliable
> [this will eventually be 'in production' as part of a large scientific
> project] way to host this sort of WSGI with a process-per-request
> style?
> 
>......

We've used forked fastcgi (flup) with success as that decouples the wsgi process 
(in our case django) from the main server (in our case apache). Our reasons for 
doing that were to allow the backend to use modern pythons without having to 
upgrade the server (which is required if using say mod_python). The wsgi process 
runs as an ordinary user which eases some tasks.

A disadvantage of our scheme is that long running processes may cause problems 
eg timeouts. In practice since there are no guarantees for how long an http 
connection will hold up (because of proxies etc etc) we decided to work around 
this problem. Basically long running jobs go into a task queue on the server and 
the response is used to reconnect to the long running job peridically for status 
querying/results etc etc.
-- 
Robin Becker



From bearophileHUGS at lycos.com  Wed Feb 11 07:16:03 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 11 Feb 2009 04:16:03 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>

christopher.saun... at durham.ac.uk (c d saunter):

>I assume it is a feature of the compiler.<

Yes it's a bug-prone antifeature that's probably a relic from C that
doesn't have a concatenation operator among strings as Python does
(+). So in Python it saves you to use + at the cost of possible bugs.

Bye,
bearophile


From joelc at cognyx.com  Wed Feb 11 07:32:16 2009
From: joelc at cognyx.com (Joel Ross)
Date: Wed, 11 Feb 2009 23:32:16 +1100
Subject: Variable + String Format
In-Reply-To: <pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>	<01a1281b$0$7503$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a169a2$0$23675$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:
> On Wed, 11 Feb 2009 18:52:40 +1100, Joel Ross wrote:
> 
>> Thanks for the quick response guys. Help me out a alot. I'm a newbie to
>> python and your replies help me understand a bit more about python!!
> 
> Joel, unless you have Guido's time machine and are actually posting from 
> the future, the clock, or possibly the time zone, on your PC is set 
> wrong. 
> 
> 
I'm from the distant future. Too protect and Serve humankind!!!

lol thanks dude. I'm a day ahead of myself. I had my linux box running 
off UTC and it didn't include daylight savings so I adjusted it myself, 
must have accidentally changed the day as well :).


From benjamin.kaplan at case.edu  Wed Feb 11 08:23:41 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 08:23:41 -0500
Subject: cannot install
In-Reply-To: <9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
	<ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>
	<5929AA4E-C3C7-42FE-93B0-6D1F11932B73@volny.cz>
	<ec96e1390902100535p7075ce98kf8ef72f8251f7b2a@mail.gmail.com>
	<9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
Message-ID: <ec96e1390902110523u7cf76a01k738d535533bc10c7@mail.gmail.com>

2009/2/11 administrator <vzupka at volny.cz>

> I tried as admin with Python-3.0 in my home directory but no success yet.
> Is there another help?
>
> Macintosh:~ admin$ export
> PATH=/opt/local/bin:/opt/local/sbin:/Developer/usr/bin:$PATH
> Macintosh:~ admin$ echo $PATH
>
> /opt/local/bin:/opt/local/sbin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/admin:/usr/local/bin:/usr/X11/bin
> Macintosh:~ admin$ cd ~/Python-3.0
> Macintosh:Python-3.0 admin$ pwd
> /Users/admin/Python-3.0
> Macintosh:Python-3.0 admin$ sudo ./configure --enable-framework
> checking for --with-universal-archs... 32-bit
> checking MACHDEP... darwin
> checking machine type as reported by uname -m... i386
> checking for --without-gcc... no
> checking for gcc... gcc
> checking for C compiler default output file name...
> *configure: error: C compiler cannot create executables*
> See `config.log' for more details.
> Macintosh:Python-3.0 admin$
>



What does config.log say?


>
>
> Regards, Vladimir Zupka
>
> On 10.2.2009, at 14:35, Benjamin Kaplan wrote:
>
>
>
> On Tue, Feb 10, 2009 at 4:07 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:
>
>> I tried this:
>> PATH=$PATH:/Developer/usr/bin
>> echo $PATH
>> cd /Python-3.0
>> ./configure --enable-framework
>> make
>> sudo make install
>>
>> and the result is:
>>
>> Macintosh:~ vzupka$ /Users/vzupka/Desktop/Python.sh ; exit;
>>
>> /Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/Developer/usr/bin
>> checking for --with-universal-archs... 32-bit
>> checking MACHDEP... darwin
>> checking machine type as reported by uname -m... i386
>> checking for --without-gcc... no
>> checking for gcc... gcc
>> checking for C compiler default output file name...
>> *configure: error: C compiler cannot create executables*
>> *See `config.log' for more details.*
>> make: *** No targets specified and no makefile found.  Stop.
>>
>> WARNING: Improper use of the sudo command could lead to data loss
>> or the deletion of important system files. Please double-check your
>> typing when using sudo. Type "man sudo" for more information.
>>
>> To proceed, enter your password, or type Ctrl-C to abort.
>>
>> Password:
>> logout
>>
>> [Process completed]
>>
>> What is wrong with C compiler? Where do I find the 'config.log'?
>>
>
>
> config.log should be in Python-3.0. I believe that you have a permissions
> problem. ./configure needs to generate the makefiles that tell the compiler
> what to do and then the make command will create the executables. Since
> you're not in your home directory, you (as a standard user) don't have
> permission to write to that directory. Either move Python-3.0 to somewhere
> that you have write permissions or use sudo for the whole script.
>
>
>
> Vladimir Zupka
>>
>> On 9.2.2009, at 16:56, Benjamin Kaplan wrote:
>>
>>
>>
>> On Mon, Feb 9, 2009 at 9:05 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:
>>
>>> I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python 3.0
>>> into a folder (/Library/Frameworks/Python.framework) and ran commands:
>>>
>>> cd /Library/Frameworks/Python.framework/Python-3.0
>>> python setup.py install
>>>
>>> and got the message reporting a syntax error:
>>>
>>> Macintosh:~ vzupka$ /bin/csh
>>> [Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
>>> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python
>>> setup.py install
>>>   File "setup.py", line 232
>>>     except (CCompilerError, DistutilsError) as why:
>>>                                              ^
>>> SyntaxError: invalid syntax
>>> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%
>>>
>>>
>>>
>>
>> You can't use setup.py because the python 2.5 on your system (or 2.6 if
>> you installed it) is incompatible with Python 3 modules. You need to compile
>> Python 3 yourself. It will then automatically call setup.py to create all
>> the extension modules.
>>
>> Just unpack the tarball anywhere and use the following commands  Python 3
>> is automatically installed as python3.0, so you don't need to worry about
>> overwriting the default python on the system.
>>
>> ./configure --enable-framework
>> make
>> sudo make install
>>
>> more complete instructions are in the Mac/README file, except substitute
>> "Python 3.0" everywhere it says "MacPython 2.6". You will probably need to
>> install a whole bunch of packages to compile it. configure will tell you
>> about them. MacPorts (www.macports.org) and fink (www.finkproject.org)
>> provide an easy way to get them.
>>
>>
>>> Regards,
>>>  Vladim?r ?upka
>>> vzupka at volny.cz
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>>  Vladim?r ?upka
>> vzupka at volny.cz
>>
>>
>>
>>
>>
>>
>
>
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From robince at gmail.com  Wed Feb 11 08:28:01 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 05:28:01 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
Message-ID: <e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>

On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
> We've used forked fastcgi (flup) with success as that decouples the wsgi process
> (in our case django) from the main server (in our case apache). Our reasons for
> doing that were to allow the backend to use modern pythons without having to
> upgrade the server (which is required if using say mod_python). The wsgi process
> runs as an ordinary user which eases some tasks.

Yes - I've done something very similar with ajp-wsgi (from the author
of flup; and which incidently performs very well works really nicely)
to go from apache -> wsgi. But the issue I'm asking about here is to
have multiple WSGI processes - ie to allow concurrent execution of
more than one web service at the time (since these are long running
computational soap web services). ajp-wsgi embeds a single python
interpreter so multiple running services would be effected by the GIL
- I imagine flup is similar (a single process on the python side).

So I'm not worried about decoupling from the web server - I'm happy to
use pure python server (which I guess is easier to setup) - but I want
the web server to dispatch requests to different processes running the
wsgi app. I've looked at Spawning, but couldn't get it to work and it
seems a little bit 'beta' for my taste (doesn't exit cleanly, leaves
worker processes running etc.)

Cheers

Robin





From pete.forman at westerngeco.com  Wed Feb 11 08:42:26 2009
From: pete.forman at westerngeco.com (Pete Forman)
Date: Wed, 11 Feb 2009 13:42:26 +0000
Subject: optparse versus getopt
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
	<gmssmk$eai$1@ger.gmane.org>
	<f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
	<mailman.9291.1234309202.3487.python-list@python.org>
Message-ID: <63jhum2l.fsf@wgmail2.gatwick.eur.slb.com>

Robert Kern <robert.kern at gmail.com> writes:

>> is there some way i can force the import based on the the absolute
>> path to the module?
>
 > Better would be for you to copy the optparse.py module onto your
 > Jython's import path. I'm not particularly familiar with the details
 > of Jython, so you will need to consult with the Jython documentation
 > unless if a Jython expert can jump in here. Here is one message
 > describing this procedure:
>
 >   http://osdir.com/ml/lang.jython.user/2004-01/msg00086.html

Here are notes from some of my code which can run on Jython.  You
might also like to check out Jython 2.5 which is in beta.

  Jython 2.2 needs optparse.py and textwrap.py.  These can be copied
  from Python 2.3 or Optik 1.4.1 or later.  May also need gettext.py
  and locale.py.

-- 
Pete Forman                -./\.-  Disclaimer: This post is originated
WesternGeco                  -./\.-   by myself and does not represent
pete.forman at westerngeco.com    -./\.-   the opinion of Schlumberger or
http://petef.22web.net           -./\.-   WesternGeco.


From steve at holdenweb.com  Wed Feb 11 09:26:38 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 09:26:38 -0500
Subject: getopt index out of range
In-Reply-To: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
Message-ID: <gmun7c$puu$1@ger.gmane.org>

Matthew Sacks wrote:
> Hi List,
> I am getting an index out of range error when trying to parse with getopt.
> Probably something simple. Any suggestions are appreciated
> 
> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
> 
> 
> #Assign Opts
> connectPassword = optlist[0][1]
> adminServerURL = optlist[1][1]
> action = optlist[2][1]
> targets = optlist[3][1]
> appDir = optlist[4][1]
> 
> #this statement never gets executed
> print "Args: " + connectPassword + " " + adminServerURL + " " + action
> + " " + targets + " " + appDir
> 
>   File "/home/msacks/untitled4.py", line 23, in ?
> IndexError: index out of range: 0
> 
It might help a little if you made it more obvious which was line 23 ...

The real problem, though, is a misunderstanding of what getopt.getopt()
returns. The (option, value) pairs are only returned for options found
in the command line, so you can't guarantee there'll be four.

Set your values to defaults, then adjust for those for which an option
is found in the list, as in the "typical usage" example in the Fine Manual.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb 11 09:42:45 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 09:42:45 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmt0pf$t6u$1@ger.gmane.org>
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
Message-ID: <gmuo5k$tdt$1@ger.gmane.org>

Terry Reedy wrote:
> r0g wrote:
> 
>>
>> def inet2ip(n):
>>   p = (n/16777216)
>>   q = ((n-(p*16777216))/65536)
>>   r = ((n-((p*16777216)+(q*65536)))/256)
>>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> Beyond what other wrote:
> To future-proof code, use // instead of / for integer division.
> To get both quotient and remainder, use divmod(num,den)
> For future reading (and generalization) documenting magic constants helps.
> 
> In 3.0:
> 
> def inet2ip(n):
>   p = (n//16777216)
>   q = ((n-(p*16777216))//65536)
>   r = ((n-((p*16777216)+(q*65536)))//256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> def inet2ip2(n):
>     p,n=divmod(n,16777216) # 1<<24
>     q,n=divmod(n,65536) # 1<<16
>     r,s=divmod(n,256) # 1<<8
>     return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> print(inet2ip(1000000000), inet2ip2(1000000000))
> 
>>>>
> 59.154.202.0 59.154.202.0
> 
Jeez, doesn't anyone read the fine manual any more? I hope this was just
an academic exercise.

>>> socket.inet_ntoa(struct.pack("!l", 1000000000))
'59.154.202.0'
>>>

Holden's rule: when it looks simple enough to be worth including in the
standard library it may well already *be* in the standard library.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jonathan.chacon at telefonica.net  Wed Feb 11 09:44:45 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Wed, 11 Feb 2009 15:44:45 +0100
Subject: Get an image from a webcam in macOS
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAIAcWNRwqt5NlGfOhdO75b3CgAAAEAAAAFIzh9foQ91OqDOxhkHTu7gBAAAAAA==@telefonica.net>

Hello,
 
I can get an Image from a webcam in windows but I don't know how can I
get an image from the webcam in a macbook in leopard.
 
How can I do this?
 
thanks and regards
    Jonathan Chac?n
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From google at mrabarnett.plus.com  Wed Feb 11 10:11:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 11 Feb 2009 15:11:24 +0000
Subject: getopt index out of range
In-Reply-To: <gmun7c$puu$1@ger.gmane.org>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
	<gmun7c$puu$1@ger.gmane.org>
Message-ID: <4992EA9C.4010207@mrabarnett.plus.com>

Steve Holden wrote:
> Matthew Sacks wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>>
>> #this statement never gets executed
>> print "Args: " + connectPassword + " " + adminServerURL + " " + action
>> + " " + targets + " " + appDir
>>
>>   File "/home/msacks/untitled4.py", line 23, in ?
>> IndexError: index out of range: 0
>>
> It might help a little if you made it more obvious which was line 23 ...
> 
It a guess I'd say it was:

     connectPassword = optlist[0][1]

because the traceback says the index is 0 and there's only one line with 
a 0 in it!

> The real problem, though, is a misunderstanding of what getopt.getopt()
> returns. The (option, value) pairs are only returned for options found
> in the command line, so you can't guarantee there'll be four.
> 
> Set your values to defaults, then adjust for those for which an option
> is found in the list, as in the "typical usage" example in the Fine Manual.
> 


From robince at gmail.com  Wed Feb 11 10:12:43 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 07:12:43 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
Message-ID: <b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>

On Feb 11, 1:28?pm, Robin <robi... at gmail.com> wrote:
> On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
>
> > We've used forked fastcgi (flup) with success as that decouples the wsgi process
> > (in our case django) from the main server (in our case apache). Our reasons for
> > doing that were to allow the backend to use modern pythons without having to
> > upgrade the server (which is required if using say mod_python). The wsgi process
> > runs as an ordinary user which eases some tasks.

I'm sorry - I originally missed the worked 'forked' and hence the
whole point of your message I think.

I looked at flup before but had forgotten about the forked version.
Having revisited it I think the forked version does keep a process
pool so each request is processed by a seperate process, which is
exactly what I wanted.

Cheers

Robin


From jaywgraves at gmail.com  Wed Feb 11 10:13:13 2009
From: jaywgraves at gmail.com (jay graves)
Date: Wed, 11 Feb 2009 07:13:13 -0800 (PST)
Subject: Pycon 2009 Hotel?
Message-ID: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>

I'm attending Pycon this year and for the first time I have to pay for
myself.  (All training/conference budgets have been zeroed out at my
company.)

I would like to take the cheaper option by staying at the Crowne Plaza
but as I understand it, the part of the conference I'll be attending
will be held at the Hyatt Regency.  I don't mind the walk but I also
don't want to miss out on the open spaces in the evening.

Is anyone else similarly on the fence?  I'd like to save $130 ((153 -
100) * 3) but since I'm not staying for the sprints and alot of my
enjoyment of the conference is the open spaces.




From deets at nospam.web.de  Wed Feb 11 10:16:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 11 Feb 2009 16:16:43 +0100
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
	<b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>
Message-ID: <6vg8erFjrh7aU1@mid.uni-berlin.de>

Robin wrote:

> On Feb 11, 1:28?pm, Robin <robi... at gmail.com> wrote:
>> On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
>>
>> > We've used forked fastcgi (flup) with success as that decouples the
>> > wsgi process (in our case django) from the main server (in our case
>> > apache). Our reasons for doing that were to allow the backend to use
>> > modern pythons without having to upgrade the server (which is required
>> > if using say mod_python). The wsgi process runs as an ordinary user
>> > which eases some tasks.
> 
> I'm sorry - I originally missed the worked 'forked' and hence the
> whole point of your message I think.
> 
> I looked at flup before but had forgotten about the forked version.
> Having revisited it I think the forked version does keep a process
> pool so each request is processed by a seperate process, which is
> exactly what I wanted.

You can have that with mod_wsgi & daemon mode as well, with presumably less
setup hassle.

Diez


From jaywgraves at gmail.com  Wed Feb 11 10:17:38 2009
From: jaywgraves at gmail.com (jay graves)
Date: Wed, 11 Feb 2009 07:17:38 -0800 (PST)
Subject: Pycon 2009 Hotel?
References: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>
Message-ID: <770f9939-2623-4562-84cf-ad419b7fbcbf@r15g2000prd.googlegroups.com>

On Feb 11, 9:13?am, jay graves <jaywgra... at gmail.com> wrote:
> I'm attending Pycon this year and for the first time I have to pay for
> myself. ?(All training/conference budgets have been zeroed out at my
> company.)
>
> I would like to take the cheaper option by staying at the Crowne Plaza
> but as I understand it, the part of the conference I'll be attending
> will be held at the Hyatt Regency. ?I don't mind the walk but I also
> don't want to miss out on the open spaces in the evening.
>
> Is anyone else similarly on the fence? ?I'd like to save $130 ((153 -
> 100) * 3) but since I'm not staying for the sprints and alot of my
> enjoyment of the conference is the open spaces.

(Sorry. i hit 'Send' too quickly.)

I'm wondering if I'm being 'penny-wise and pound-foolish'?  I'd hate
to spend all that money to get there and then not enjoy it because I
was at the 'other' hotel.

...
Jay Graves




From michele.simionato at gmail.com  Wed Feb 11 10:18:53 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 11 Feb 2009 07:18:53 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <a780e247-5a1a-4dd7-a10e-8c78e9ed5af8@e18g2000yqo.googlegroups.com>

On Feb 10, 9:28?pm, r0g <aioe.... at technicalbloke.com> wrote:
> def ip2inet(a):
> ? li = a.split('.')
> ? assert len(li) == 4 or len(li) == 6
> ? return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
> xrange(0,len(li))])

Aagh! Notice that functional programming is not about filter, map,
reduce and other unreadable constructs: it is much more about avoiding
mutation.

Your problem has been already solved by using the standard library;
however, if you want to know more about functional programming, I
could as well advertise my own series of "Adventures of a Pythonista
in Schemeland" which is facing exactly that topic right now:

http://www.artima.com/weblogs/viewpost.jsp?thread=248953


From nick at craig-wood.com  Wed Feb 11 10:31:56 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 11 Feb 2009 09:31:56 -0600
Subject: Escaping my own chroot...
References: <gmt446$fq0$1@aioe.org>
Message-ID: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>

r0g <aioe.org at technicalbloke.com> wrote:
>  I'm writing a linux remastering script in python where I need to chroot
>  into a folder, run some system commands and then come out and do some
>  tidying up, un-mounting proc & sys etc.
> 
>  I got in there with os.chroot() and I tried using that to get back out
>  but that didn't work so... is my script trapped in there forever now or
>  is there an un-hacky way to escape?

No!

>  If it is an OS restriction rather than my ignorance of python is there a
>  canonical way of dealing with it? Should I maybe fork a process, have it
>  do the chroot and wait for it to terminate before continuing?

That is the only way...

However this is a solved problem if you use schroot (which works very
well in my experience)

  http://packages.debian.org/sid/schroot
  http://www.debian-administration.org/articles/566

There are definitely debian, ubuntu and centos packages for it if you
look!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From meshko at gmail.com  Wed Feb 11 10:33:29 2009
From: meshko at gmail.com (mk)
Date: Wed, 11 Feb 2009 07:33:29 -0800 (PST)
Subject: SOAP client
Message-ID: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>

Hi,

I'm trying to consume a SOAP web service using Python.  So far I have
found two libraries: SOAPpy and ZSI.  Both of them rely on PyXML which
is no longer maintained (and there is no build for 64bit Windows and
the setup.py doesn't seem to know how to build it on Windows).  Is
there a live SOAP library for Python?  I'm sort of surprised that a
common standard like SOAP is not more actively supported in Python.
I'm probably missing something?

Thanks,
m


From kmmcdonald at medicine.wisc.edu  Wed Feb 11 10:43:22 2009
From: kmmcdonald at medicine.wisc.edu (Ken McDonald)
Date: Wed, 11 Feb 2009 09:43:22 -0600
Subject: access to MS Access password-protected database?
Message-ID: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>

Can anyone direct me towards a code snippet showing how to use Python  
to insert data into a password-protected MS Access database? My google  
searches have been uninformative for dbs that are password-protected.

Thanks,
Ken



From joaorabelo at gmail.com  Wed Feb 11 10:44:27 2009
From: joaorabelo at gmail.com (=?ISO-8859-1?Q?Jo=E3o_Rabelo?=)
Date: Wed, 11 Feb 2009 13:44:27 -0200
Subject: No subject
Message-ID: <21d3d9990902110744r2033d4b2w68bf93ce26997c58@mail.gmail.com>


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From robin at reportlab.com  Wed Feb 11 10:46:45 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 15:46:45 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
Message-ID: <4992F2E5.1000002@chamonix.reportlab.co.uk>

Robin wrote:
..........
> 
> Yes - I've done something very similar with ajp-wsgi (from the author
> of flup; and which incidently performs very well works really nicely)
> to go from apache -> wsgi. But the issue I'm asking about here is to
> have multiple WSGI processes - ie to allow concurrent execution of
> more than one web service at the time (since these are long running
> computational soap web services). ajp-wsgi embeds a single python
> interpreter so multiple running services would be effected by the GIL
> - I imagine flup is similar (a single process on the python side).
> 
> So I'm not worried about decoupling from the web server - I'm happy to
> use pure python server (which I guess is easier to setup) - but I want
> the web server to dispatch requests to different processes running the
> wsgi app. I've looked at Spawning, but couldn't get it to work and it
> seems a little bit 'beta' for my taste (doesn't exit cleanly, leaves
> worker processes running etc.)

well the flup server for fast cgi supports forking if the server is declared as 
an external process in apache. Then the top level of the flup process handles 
each request and passes it off to a forked worker. I cannot recall exactly, but 
I believe that apache mod_fastcgi does the right thing when it comes to 
internally declared fastcgi handlers. For apache at least I think the threading 
issues are handled properly.

I think the preforkserver.py code handles all the threading issues for you 
(assuming it's not win32).
-- 
Robin Becker



From tino at wildenhain.de  Wed Feb 11 10:47:56 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 11 Feb 2009 16:47:56 +0100
Subject: urllib2.Request:: http Request sending successfully, but Response
	contains in valid data.
In-Reply-To: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
References: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
Message-ID: <4992F32C.3050402@wildenhain.de>

Hi,

nRk wrote:
> Hi
> 
> I am trying to send Data to a website through "http" using
> "urllib.request" library using the bellow code.
> Response status code contains. 200 (OK) but Response contains
> nothing...
> 
> With same data When I test using C# it working fine.. Response
> having.. some data in xml format.
> But I am using below python code i am getting response only "<HTML></
> HTML>".

This does not mean you are doing it identical to C# here, doesn't it?
Also you might be looking at the defaults in the calls within C#
and some weird expectations on server side.

Also you are requesting XML by sending a payload of XML data,
so you need to make sure you actually use POST and not GET.

I'd start by watching your working application with
strace or wireshark and compare with the data to and fro
from your python application.

Also I believe there should be example code for reading
RSS feeds from python.


> Is there any in my code..
> 
>  req  = urllib2.Request(url) // url is valid url
>  req.add_header('Authorization','AuthSub token="xxxxxxxxxxxxx"')
>  req.add_header('Content-Type','application/atom+xml')
>  req.data=data  // data is having valid xml data
>  r = urllib2.urlopen(req)

> print(r.code) // output 200
> print(r.msg) // output OK
> print(r.read()) //<HTML></HTML>

Regards
Tino


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From mal at egenix.com  Wed Feb 11 10:48:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 11 Feb 2009 16:48:31 +0100
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <6vg8erFjrh7aU1@mid.uni-berlin.de>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>	<b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>
	<6vg8erFjrh7aU1@mid.uni-berlin.de>
Message-ID: <4992F34F.2040306@egenix.com>

On 2009-02-11 16:16, Diez B. Roggisch wrote:
> Robin wrote:
> 
>> On Feb 11, 1:28 pm, Robin <robi... at gmail.com> wrote:
>>> On Feb 11, 12:10 pm, Robin Becker <ro... at reportlab.com> wrote:
>>>
>>>> We've used forked fastcgi (flup) with success as that decouples the
>>>> wsgi process (in our case django) from the main server (in our case
>>>> apache). Our reasons for doing that were to allow the backend to use
>>>> modern pythons without having to upgrade the server (which is required
>>>> if using say mod_python). The wsgi process runs as an ordinary user
>>>> which eases some tasks.
>> I'm sorry - I originally missed the worked 'forked' and hence the
>> whole point of your message I think.
>>
>> I looked at flup before but had forgotten about the forked version.
>> Having revisited it I think the forked version does keep a process
>> pool so each request is processed by a seperate process, which is
>> exactly what I wanted.
> 
> You can have that with mod_wsgi & daemon mode as well, with presumably less
> setup hassle.

Another option that works well on Unix and even Windows is SCGI
which deals with the forking and piping of data for you:

    http://www.mems-exchange.org/software/scgi/
    http://python.ca/scgi/

Lighttpd even ships with a mod_scgi module built-in.

More on the protocol used by SCGI (basically net-strings):

    http://python.ca/scgi/protocol.txt

Unlike FastCGI, it's very easy to setup.

Since SCGI provides standard CGI on the Python side, it's easy to
wrap this up as WSGI interface (using e.g. the code from PEP 333).

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 11 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mail at timgolden.me.uk  Wed Feb 11 11:17:40 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 11 Feb 2009 16:17:40 +0000
Subject: access to MS Access password-protected database?
In-Reply-To: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>
References: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>
Message-ID: <4992FA24.50601@timgolden.me.uk>

Ken McDonald wrote:
> Can anyone direct me towards a code snippet showing how to use Python to 
> insert data into a password-protected MS Access database? My google 
> searches have been uninformative for dbs that are password-protected.

Caveat: I've never done it and I have no Access db to hand,
but in a spirit of being helpful...

According to this snippet:

http://www.vb-helper.com/howto_ado_use_access_password.html

it can be done via ADO. You can either roll your own, or you
can use the adodbapi module from the pywin32 extensions.

TJG


From gil.shinar at gmail.com  Wed Feb 11 11:18:58 2009
From: gil.shinar at gmail.com (gil.shinar at gmail.com)
Date: Wed, 11 Feb 2009 08:18:58 -0800 (PST)
Subject: Process crash with no reason
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
	<6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
	<mailman.9090.1234107079.3487.python-list@python.org>
Message-ID: <a5ccb709-f3ea-4b09-b593-54e43fe0afc3@u13g2000yqg.googlegroups.com>

On Feb 8, 5:31?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > Thanks a lot and sorry for the late response. My main suspect is the
> > CherryPy.
> > I'm still investigating it.
>
> You're asking for advice but not listening to what people are saying
> here -- why is CherryPy on the top of your list?
>
> What version of CherryPy is it? 1 or 2?
>
> If its 2, then its pure python and there's a really, really low chance
> that its provoking a hard crash w/o a traceback printing before it
> dies out. A hard crash which isn't printing an error message is
> possible in pure Python I suppose, but I've never seen it. A "Bus
> error" for example will kill the interpreter before it can do any
> error handling. But I've only ever seen that when interfacing with
> third party libraries.
>
> If its 1, there is some C so you can bump it up ... and for that I'd
> probably attempt to run the application in a console or with stdout
> manually redirected instead of relying on the logging alone, to see if
> anything useful gets put out.. like "Bus error", at the time it exits.
>
> But why do you keep discarding the Sybase module?
>
> Its most definitely *not* written in python. What Philip and Tim were
> trying to tell you is you are *not* using "python's functions to run
> sybase sql commands"
>
> The Sybase module is a python wrapper around code written in C module
> which is interfacing with a third party library to talk to Sybase. Are
> you at the latest version of Sybase(0.39 if its the same module I'm
> aware of?) How about the library underneath it? FreeTDS or Sybase ASE
> (whatever that is) or whatever else is being used? A bug in /any/ of
> those C layers (notice its *multiple* layers) could propagate up and
> provoke a hard crash that Python doesn't catch. So if you look into
> those versions perhaps one has a new release that fixes bugs.
>
> --S

Hi,

After farther investigation and some help from other developers, we
got to the conclusion that the python process does not crash but the
program exits because cherrypy freezes and the python program has
nothing to do when the web service is not responding. My cherrypy
version is 3.0.1
Can any of you help me with cherrypy or should I ask in cherrypy
group?

Thanks

Gil


From robince at gmail.com  Wed Feb 11 11:19:05 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 08:19:05 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
	<mailman.9333.1234367215.3487.python-list@python.org>
Message-ID: <79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>

On Feb 11, 3:46?pm, Robin Becker <ro... at reportlab.com> wrote:
> well the flup server for fast cgi supports forking if the server is declared as
> an external process in apache. Then the top level of the flup process handles
> each request and passes it off to a forked worker. I cannot recall exactly, but
> I believe that apache mod_fastcgi does the right thing when it comes to
> internally declared fastcgi handlers. For apache at least I think the threading
> issues are handled properly.
>
> I think the preforkserver.py code handles all the threading issues for you
> (assuming it's not win32).

Thanks - I think if I go the flup route I would use AJP though - since
its very easy to setup with apache (1 proxy line) and mod_ajp comes as
standard. And then everything is very much seperated from the apache
process.



From robince at gmail.com  Wed Feb 11 11:20:23 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 08:20:23 -0800 (PST)
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
Message-ID: <9670bb81-a879-43cc-8abf-040e7b18c59d@q9g2000yqc.googlegroups.com>

On Feb 11, 3:33?pm, mk <mes... at gmail.com> wrote:
> Hi,
>
> I'm trying to consume a SOAP web service using Python. ?So far I have
> found two libraries: SOAPpy and ZSI. ?Both of them rely on PyXML which
> is no longer maintained (and there is no build for 64bit Windows and
> the setup.py doesn't seem to know how to build it on Windows). ?Is
> there a live SOAP library for Python? ?I'm sort of surprised that a
> common standard like SOAP is not more actively supported in Python.
> I'm probably missing something?
>
> Thanks,
> m

For consuming services, I've found suds to be the best client:
https://fedorahosted.org/suds/

For creating them, I've been using soaplib:
http://trac.optio.webfactional.com/

HTH,

Robin


From kyosohma at gmail.com  Wed Feb 11 11:26:39 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 08:26:39 -0800 (PST)
Subject: Pycon 2009 Hotel?
References: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>
	<770f9939-2623-4562-84cf-ad419b7fbcbf@r15g2000prd.googlegroups.com>
Message-ID: <773f47dc-3bab-407d-a752-b09bc3aaf06f@p13g2000yqc.googlegroups.com>

On Feb 11, 9:17?am, jay graves <jaywgra... at gmail.com> wrote:
> On Feb 11, 9:13?am, jay graves <jaywgra... at gmail.com> wrote:
>
> > I'm attending Pycon this year and for the first time I have to pay for
> > myself. ?(All training/conference budgets have been zeroed out at my
> > company.)
>
> > I would like to take the cheaper option by staying at the Crowne Plaza
> > but as I understand it, the part of the conference I'll be attending
> > will be held at the Hyatt Regency. ?I don't mind the walk but I also
> > don't want to miss out on the open spaces in the evening.
>
> > Is anyone else similarly on the fence? ?I'd like to save $130 ((153 -
> > 100) * 3) but since I'm not staying for the sprints and alot of my
> > enjoyment of the conference is the open spaces.
>
> (Sorry. i hit 'Send' too quickly.)
>
> I'm wondering if I'm being 'penny-wise and pound-foolish'? ?I'd hate
> to spend all that money to get there and then not enjoy it because I
> was at the 'other' hotel.
>
> ...
> Jay Graves

As I understand it, the hotels are connected via a skywalk, so I don't
think it will be a big deal either way. It just means a little extra
walking.

Mike


From notvalid2 at sbcglobal.net  Wed Feb 11 11:28:01 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 08:28:01 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
Message-ID: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>

My program in IDLE bombed with:
==============
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 552, in OperationalSettings
     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 81, in __init__
     tkSimpleDialog.Dialog.__init__(self, parent)
   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
     self.wait_visibility() # window needs to be visible for the grab
   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
     self.tk.call('tkwait', 'visibility', window._w)
TclError: window ".34672232" was deleted before its visibility changed
===============
It runs fine in pythonWin performing the same entry operation. Open a menu, 
  select an item to open a dialog, select a select button in the dialog, 
press OK to leave the dialog. Boom, as above.

(This does not mean pythonWin doesn't have problems of its own. ) If I just 
execute the code (double click on the py file, the console shows no 
problems. IDLE is unhappy.

Another side to this is that I use WinMerge to find differences between my 
last saved copy and the current copy. I found the current copy had two lines 
where a abc.get() was changed to abc.get. This was undoubtedly from briefly 
using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble 
executing the program. My guess is that while briefly editing there, I hit 
some odd combination of keys that produced, perhaps, an invisible character 
that pyWin ignores.

Not the 34672232 window is a dialog that I closed by pressing OK. I would 
again guess, that, if there is a problem, it occurs in the code that 
destroys the dialog.


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From robin at reportlab.com  Wed Feb 11 11:32:42 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 16:32:42 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>	<mailman.9333.1234367215.3487.python-list@python.org>
	<79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>
Message-ID: <4992FDAA.8090908@chamonix.reportlab.co.uk>

Robin wrote:
> On Feb 11, 3:46 pm, Robin Becker <ro... at reportlab.com> wrote:
>> well the flup server for fast cgi supports forking if the server is declared as
>> an external process in apache. Then the top level of the flup process handles
>> each request and passes it off to a forked worker. I cannot recall exactly, but
>> I believe that apache mod_fastcgi does the right thing when it comes to
>> internally declared fastcgi handlers. For apache at least I think the threading
>> issues are handled properly.
>>
>> I think the preforkserver.py code handles all the threading issues for you
>> (assuming it's not win32).
> 
> Thanks - I think if I go the flup route I would use AJP though - since
> its very easy to setup with apache (1 proxy line) and mod_ajp comes as
> standard. And then everything is very much seperated from the apache
> process.
.......

that's right and very easy to control. The only problem I recall is that the 
socket needs to be made readable by www. You can do that with a sudo chown or by 
setting up the mask at the ajp server start.
-- 
Robin Becker



From exarkun at divmod.com  Wed Feb 11 11:35:32 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 11 Feb 2009 11:35:32 -0500
Subject: Escaping my own chroot...
In-Reply-To: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>
Message-ID: <20090211163532.12853.310274003.divmod.quotient.8899@henry.divmod.com>

On Wed, 11 Feb 2009 09:31:56 -0600, Nick Craig-Wood <nick at craig-wood.com> wrote:
>r0g <aioe.org at technicalbloke.com> wrote:
>>  I'm writing a linux remastering script in python where I need to chroot
>>  into a folder, run some system commands and then come out and do some
>>  tidying up, un-mounting proc & sys etc.
>>
>>  I got in there with os.chroot() and I tried using that to get back out
>>  but that didn't work so... is my script trapped in there forever now or
>>  is there an un-hacky way to escape?
>
>No!
>

If you still have root in the chroot (and you need root to get in there, so
it's not implausible that you will), then you can get out.  Googling for
"escape chroot" turns up lots of hits.  This page contains a fairly simple,
explicit description of how to get out of a chroot:

   http://www.bpfh.net/simes/computing/chroot-break.html

See the bulleted list in the "Breaking chroot()" section.  Since you also
control the process before the chroot happens, breaking out is even simpler
in your case (just open / before you chroot in the first place).  forking
before doing the chroot may still be a good idea, but it's not the only
solution.

Jean-Paul


From kyosohma at gmail.com  Wed Feb 11 11:44:55 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 08:44:55 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
Message-ID: <b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>

On Feb 11, 10:28?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> My program in IDLE bombed with:
> ==============
> Exception in Tkinter callback
> Traceback (most recent call last):
> ? ?File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> ? ? ?return self.func(*args)
> ? ?File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 552, in OperationalSettings
> ? ? ?dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> ? ?File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 81, in __init__
> ? ? ?tkSimpleDialog.Dialog.__init__(self, parent)
> ? ?File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> ? ? ?self.wait_visibility() # window needs to be visible for the grab
> ? ?File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> ? ? ?self.tk.call('tkwait', 'visibility', window._w)
> TclError: window ".34672232" was deleted before its visibility changed
> ===============
> It runs fine in pythonWin performing the same entry operation. Open a menu,
> ? select an item to open a dialog, select a select button in the dialog,
> press OK to leave the dialog. Boom, as above.
>
> (This does not mean pythonWin doesn't have problems of its own. ) If I just
> execute the code (double click on the py file, the console shows no
> problems. IDLE is unhappy.
>
> Another side to this is that I use WinMerge to find differences between my
> last saved copy and the current copy. I found the current copy had two lines
> where a abc.get() was changed to abc.get. This was undoubtedly from briefly
> using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble
> executing the program. My guess is that while briefly editing there, I hit
> some odd combination of keys that produced, perhaps, an invisible character
> that pyWin ignores.
>
> Not the 34672232 window is a dialog that I closed by pressing OK. I would
> again guess, that, if there is a problem, it occurs in the code that
> destroys the dialog.
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

You don't really say what your code does or if it uses a GUI toolkit
and if so, which one. But my guess is that you are using some kind of
GUI and its GUI and IDLE's are clashing somehow. I see this sort of
thing with some of my wxPython programs from time to time, although
IDLE usually just crashes with no error message.

I would recommend using the command line or something that can open it
in a completely separate process, such as Wingware's IDE.

Mike


From steve at holdenweb.com  Wed Feb 11 11:48:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 11:48:49 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
Message-ID: <gmuvi1$pnr$1@ger.gmane.org>

W. eWatson wrote:
> My program in IDLE bombed with:
> ==============
> Exception in Tkinter callback
> Traceback (most recent call last):
>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>     return self.func(*args)
>   File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 552, in OperationalSettings
>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>   File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 81, in __init__
>     tkSimpleDialog.Dialog.__init__(self, parent)
>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>     self.wait_visibility() # window needs to be visible for the grab
>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>     self.tk.call('tkwait', 'visibility', window._w)
> TclError: window ".34672232" was deleted before its visibility changed
> ===============
> It runs fine in pythonWin performing the same entry operation. Open a
> menu,  select an item to open a dialog, select a select button in the
> dialog, press OK to leave the dialog. Boom, as above.
> 
> (This does not mean pythonWin doesn't have problems of its own. ) If I
> just execute the code (double click on the py file, the console shows no
> problems. IDLE is unhappy.
> 
> Another side to this is that I use WinMerge to find differences between
> my last saved copy and the current copy. I found the current copy had
> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> had no trouble executing the program. My guess is that while briefly
> editing there, I hit some odd combination of keys that produced,
> perhaps, an invisible character that pyWin ignores.
> 
> Not the 34672232 window is a dialog that I closed by pressing OK. I
> would again guess, that, if there is a problem, it occurs in the code
> that destroys the dialog.
> 
> 
Well you have to remember that you are trying to run a windowed GUI
under the control of another windows GUI, so it isn't surprising that
you hit trouble.

With IDLE the issue will be that IDLE already created a main window
before your program started running. With PythonWin you are using two
different toolkits, so it isn't really surprising that breaks down -
there will be two entirely separate main loops competing with each other.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From ivanov.maxim at gmail.com  Wed Feb 11 12:01:06 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Wed, 11 Feb 2009 09:01:06 -0800 (PST)
Subject: Could you recommend job schedulling solution?
Message-ID: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>

I've sinlge 8-way node dedicated for executing long running tasks. To
be able to execute multiple tasks on this node it shoud  spawn each
task in another process. At the same time it should accept network
connection with new tasks without blocking of client and put it on job
queue.

What is "task" ? Executing just ordinary python function will be
enough. If solution contain some client library which allow easy task
submit it will be great.


From mark.seagoe at gmail.com  Wed Feb 11 12:01:19 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 09:01:19 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
Message-ID: <002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>

On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>
> > I like the ability to access elements of a struct such as with ctypes
> > Structure:
> >>>> myStruct.elementName1
> > 4
>
> > What I like about it is there are no quotes needed.
>
> > What I don't like about it is that it's not iterable:
> >>>> for n in myStruct: ?<== gives error
> >>>> ? ?print n
>
> > I don't want to force the end user to have preknowledge of the element
> > names.
>
> Note that those names are available as the _fields_ class attribute
>
> > Has anyone subclassed ctypes Structure based class to be iterable?
> > Before a noob starts trying to do this, is it possible? ?How to
> > approach it?
>
> The easiest way would be to define __getitem__ accepting index 0, 1, 2... ?
> until the last defined field.
> Seehttp://docs.python.org/reference/datamodel.html#object.__getitem__
>
> <code>
> ?from ctypes import Structure
>
> class IterableStructure(Structure):
> ? ?def __getitem__(self, i):
> ? ? ?if not isinstance(i, int):
> ? ? ? ?raise TypeError('subindices must be integers: %r' % i)
> ? ? ?return getattr(self, self._fields_[i][0])
>
> </code>
>
> This was tested as much as you see here:
>
> py> from ctypes import c_int
> py>
> py> class POINT(IterableStructure):
> ... ? ? _fields_ = [("x", c_int),
> ... ? ? ? ? ? ? ? ? ("y", c_int)]
> ...
> py> point = POINT(10, 20)
> py> print point.x, point.y
> 10 20
> py> for field in point:
> ... ? print field
> ...
> 10
> 20
> py> print list(point)
> [10, 20]
>
> --
> Gabriel Genellina

Thanks very much, Gabriel.  This is very good start for me.
This works for predefined class.  How about a situation where the
fields are added dynamically (as from reading in from an xml file).
For example, if I were to now add another element:

>>> point.z = 30
>>> print list(point)
[10, 20]
>>> dir(point)
['__class__', '__ctypes_from_outparam__', '__delattr__', '__
dict__', '__doc__', '__getattribute__', '__getitem__', '__ha
sh__', '__init__', '__module__', '__new__', '__reduce__', '_
_reduce_ex__', '__repr__', '__setattr__', '__str__', '__weak
ref__', '_b_base_', '_b_needsfree_', '_fields_', '_objects',
 'x', 'y', 'z']

I don't know why the iterator (where ever it is) didn't get
incremented.  Thanks for any insight.

Mark


From castironpi at gmail.com  Wed Feb 11 12:17:11 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 11 Feb 2009 09:17:11 -0800 (PST)
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<6vfo6kFjlnteU1@mid.individual.net>
Message-ID: <61cb6320-3b37-4307-bf3e-8f58593d54b2@k1g2000prb.googlegroups.com>

On Feb 11, 4:41?am, greg <g... at cosc.canterbury.ac.nz> wrote:
> Aaron Brady wrote:
> > It would receive the 'send' from a different point in control
> > flow than its usual 'next'. ?Should it repeat a value if it receives a
> > 'send'?
>
> No. This requirement clearly indicates that send() is
> the wrong tool for the job.
>
> I would use a class with a generator as a method, e.g.
>
> ? ?class Multiples:
>
> ? ? ?m = 1
>
> ? ? ?def set_multiplier(self, m):
> ? ? ? ?self.m = m
>
> ? ? ?def generate(self, limit):
> ? ? ? ?for i in xrange(limit):
> ? ? ? ? ?yield i * self.m
>
> ? ?g = Multiples()
> ? ?for x in g.generate(10):
> ? ? ?print x
> ? ? ?if x == 3:
> ? ? ? ?g.set_multiplier(42)
>
> produces
>
> 0
> 1
> 2
> 3
> 168
> 210
> 252
> 294
> 336
> 378
>
> --
> Greg

Alright, but you don't have to go so far as to create an entire
class.  It's alright to use a formula.  Here's a way to add a
dictionary to a generator instance.

def gen_dict( fun ):
    def inner( *ar, **kw ):
        self.gen= fun( self, *ar, **kw )
        return self
    class GenWrapper:
        def __iter__( self ): return self
        def __next__( self, *ar, **kw ): return self.gen.__next__
( *ar, **kw )
    self= GenWrapper()
    return inner

It's a shame that you can't set 'self.__next__= self.gen.__next__'.
It costs an entire level of call depth.  On the other hand, I'm not
sure a pure delegate class is possible.

The decorator just puts the generator object in a 'gen' attribute, and
adds itself to the '__init__' argument list.  So the generator has a
'self' argument, which is of type 'instance', and allows dynamic
attributes.

@gen_dict
def jumper( self, N= 1, K= 1 ):
    self.N, self.K= N, K
    while 1:
        yield self.N
        self.N+= self.K

j= jumper()
print( next( j ) )
j.K= 4
print( next( j ) )

It might need some touch-ups to run in Python 2.  Neat mix.  It's a
cool hybrid between Terry's and Greg's idea, and a bare generator.
Unfortunately, if you want 'self' to have any methods, you'll probably
need a class... though maybe it could inherit from 'GenWrapper'.  What
do you think?

P.S.  Here's a slightly simpler version.

def gen_dict( fun ):
    class GenWrapper:
        def __init__( self, *ar, **kw ):
            self.gen= fun( self, *ar, **kw )
        def __iter__( self ): return self
        def __next__( self, *ar, **kw ): return self.gen.__next__
( *ar, **kw )
    return GenWrapper

P.P.S.  Simpler, but a line longer.

class GenWrapper:
    def __init__( self, fun ):
        self.fun= fun
    def __call__( self, *ar, **kw ):
        self.gen= self.fun( self, *ar, **kw )
        return self
    def __iter__( self ): return self
    def __next__( self, *ar, **kw ): return self.gen.__next__( *ar,
**kw )


From bedouglas at earthlink.net  Wed Feb 11 12:26:50 2009
From: bedouglas at earthlink.net (bruce)
Date: Wed, 11 Feb 2009 09:26:50 -0800
Subject: Could you recommend job schedulling solution?
In-Reply-To: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
Message-ID: <348b01c98c6d$ee610770$0301a8c0@tmesa.com>

hi...

not sure exactly what you're looking for, but "condor" has a robust job
scheduling architecture for dealing with grid/distributed setups over
multiple systems..

give us more information, and there might be other suggestions!


-----Original Message-----
From: python-list-bounces+bedouglas=earthlink.net at python.org
[mailto:python-list-bounces+bedouglas=earthlink.net at python.org]On Behalf
Of redbaron
Sent: Wednesday, February 11, 2009 9:01 AM
To: python-list at python.org
Subject: Could you recommend job schedulling solution?


I've sinlge 8-way node dedicated for executing long running tasks. To
be able to execute multiple tasks on this node it shoud  spawn each
task in another process. At the same time it should accept network
connection with new tasks without blocking of client and put it on job
queue.

What is "task" ? Executing just ordinary python function will be
enough. If solution contain some client library which allow easy task
submit it will be great.
--
http://mail.python.org/mailman/listinfo/python-list



From wilson at afn.org  Wed Feb 11 12:56:18 2009
From: wilson at afn.org (JBW)
Date: Wed, 11 Feb 2009 17:56:18 GMT
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.11.18.04.57@afn.org>

On Wed, 11 Feb 2009 07:33:29 -0800, mk wrote:

> I'm trying to consume a SOAP web service using Python.

Suds (ibid) -- accept no substitute!


From imageguy1206 at gmail.com  Wed Feb 11 13:01:37 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Wed, 11 Feb 2009 10:01:37 -0800 (PST)
Subject: access to MS Access password-protected database?
References: <mailman.9336.1234368125.3487.python-list@python.org>
Message-ID: <1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>

On Feb 11, 10:43?am, Ken McDonald <kmmcdon... at medicine.wisc.edu>
wrote:
> Can anyone direct me towards a code snippet showing how to use Python ?
> to insert data into a password-protected MS Access database? My google ?
> searches have been uninformative for dbs that are password-protected.
>
> Thanks,
> Ken

You post is a little vague on specifics
- do you actually have access to the db ?
- can you open it with access ?
- can you currently read records using python ?

I am assuming you don't have access to the db through python, once you
do the rest is straight forward.

I use DSN-less connections.  This link below is quite helpful
http://www.carlprothman.net/Default.aspx?tabid=90#ODBCDriverForAccess

If you aren't using the adodbapi (part of the pywin32 package), you
need to do something like this, assuming you access db is MS-Access
2000 and above.

<untested>
import win32com
cnx = win32com.client.Dispatch('ADODB.connection')

parms = {}
parms['driver'] = '{Microsoft Access Driver (*.mdb)}'
parms['dbase'] = path_to_mdb
parms['sys_mdw'] = path_to_workgroup_security
parms['uid'] = userid_defined_in_mdw
parhs['pwd'] = pwd_for_uid_in_mdw

cnxtr = 'Driver=%(driver)s; DBQ=%(dbase)s; SYSTEMDB=%(sys_mdw)s; UID=%
(uid)s; PWD=%(pwd)s; ' % parms
cnx.ConnectionString = cnxstr
cnx.Open()

</untested>
once you have an ADO Connection, execute SQL directly on the
connection like this

cnx.Execute('INSERT INTO tablename (col1, col2) VALUES ('val1,
val2);')

Or alternatively you should create RecordSets and manipulate these.

IF you need help understanding ADO I would recommend;
http://www.w3schools.com/ado/default.asp

The examples are translateable to Python.
You create recordsets via;
rs = win32com.client.Dispatch('ADO.RecordSet')


If you don't have/weren't given the passwords to the DB, but you do
have access to the workgroup file ('*.MDW') file that stores the uid/
pwds and permission, then there are several third party tools that
will recover these for you. Google is your friend.

If you don't have access to the original .mdw ... well, I can't help
you and I don't think anyone can.

Good luck.


From mark.seagoe at gmail.com  Wed Feb 11 13:32:41 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 10:32:41 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
Message-ID: <9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>

On Feb 11, 9:01?am, mark.sea... at gmail.com wrote:
> On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>
>
>
>
>
> > En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>
> > > I like the ability to access elements of a struct such as with ctypes
> > > Structure:
> > >>>> myStruct.elementName1
> > > 4
>
> > > What I like about it is there are no quotes needed.
>
> > > What I don't like about it is that it's not iterable:
> > >>>> for n in myStruct: ?<== gives error
> > >>>> ? ?print n
>
> > > I don't want to force the end user to have preknowledge of the element
> > > names.
>
> > Note that those names are available as the _fields_ class attribute
>
> > > Has anyone subclassed ctypes Structure based class to be iterable?
> > > Before a noob starts trying to do this, is it possible? ?How to
> > > approach it?
>
> > The easiest way would be to define __getitem__ accepting index 0, 1, 2... ?
> > until the last defined field.
> > Seehttp://docs.python.org/reference/datamodel.html#object.__getitem__
>
> > <code>
> > ?from ctypes import Structure
>
> > class IterableStructure(Structure):
> > ? ?def __getitem__(self, i):
> > ? ? ?if not isinstance(i, int):
> > ? ? ? ?raise TypeError('subindices must be integers: %r' % i)
> > ? ? ?return getattr(self, self._fields_[i][0])
>
> > </code>
>
> > This was tested as much as you see here:
>
> > py> from ctypes import c_int
> > py>
> > py> class POINT(IterableStructure):
> > ... ? ? _fields_ = [("x", c_int),
> > ... ? ? ? ? ? ? ? ? ("y", c_int)]
> > ...
> > py> point = POINT(10, 20)
> > py> print point.x, point.y
> > 10 20
> > py> for field in point:
> > ... ? print field
> > ...
> > 10
> > 20
> > py> print list(point)
> > [10, 20]
>
> > --
> > Gabriel Genellina
>
> Thanks very much, Gabriel. ?This is very good start for me.
> This works for predefined class. ?How about a situation where the
> fields are added dynamically (as from reading in from an xml file).
> For example, if I were to now add another element:
>
> >>> point.z = 30
> >>> print list(point)
> [10, 20]
> >>> dir(point)
>
> ['__class__', '__ctypes_from_outparam__', '__delattr__', '__
> dict__', '__doc__', '__getattribute__', '__getitem__', '__ha
> sh__', '__init__', '__module__', '__new__', '__reduce__', '_
> _reduce_ex__', '__repr__', '__setattr__', '__str__', '__weak
> ref__', '_b_base_', '_b_needsfree_', '_fields_', '_objects',
> ?'x', 'y', 'z']
>
> I don't know why the iterator (where ever it is) didn't get
> incremented. ?Thanks for any insight.
>
> Mark- Hide quoted text -
>
> - Show quoted text -

I tinkered with it and think I have viable solution.
I need to append a new member to _fields_ before writing it,
then it seems to work.

>>> p._fields_.append(('z', c_int))
>>> point.z = 30
>>> print 'List:', list(p)
List: [10, 20, 30]

Awesome.  Thanks!


From jeffgemail at gmail.com  Wed Feb 11 13:35:35 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 10:35:35 -0800 (PST)
Subject: Unicode issue on Windows cmd line
Message-ID: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>

Having issue on Windows cmd.
> Python.exe
>>>a = u'\xf0'
>>>print a

This gives a unicode error.

Works fine in IDLE, PythonWin, and my Macbook but I need to run this
from a windows batch.

Character should look like this "?".

Please help!


From mark.seagoe at gmail.com  Wed Feb 11 13:35:36 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 10:35:36 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
Message-ID: <db1bef7c-d5b9-4629-807e-6dbd47ed2004@u1g2000pre.googlegroups.com>

In last post, I mixed code w/ 'p' and 'point'.  Should be:

>>> point._fields_.append(('z', c_int))
>>> point.z = 30
>>> print 'List:', list(point)

List: [10, 20, 30]


From ivanov.maxim at gmail.com  Wed Feb 11 13:48:00 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Wed, 11 Feb 2009 10:48:00 -0800 (PST)
Subject: Could you recommend job schedulling solution?
References: <mailman.9341.1234373219.3487.python-list@python.org>
Message-ID: <090e3273-e017-4cb7-b1dd-4e25ca628ed2@13g2000yql.googlegroups.com>

On 11 ???, 20:26, "bruce" <bedoug... at earthlink.net> wrote:
> hi...
>
> not sure exactly what you're looking for, but "condor" has a robust job
> scheduling architecture for dealing with grid/distributed setups over
> multiple systems..
>
> give us more information, and there might be other suggestions!

Condor, Globus or any other grid system looks like serious overkill
for me. I need some sort of job manager, which accepts jobs from
clients as pickled python functions and queues/executes them. Client
side should be able to ask status of submitted job, their return
value, ask to cancel job etc.


From ntwrkd at gmail.com  Wed Feb 11 13:58:56 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 10:58:56 -0800
Subject: getopt index out of range
In-Reply-To: <4992EA9C.4010207@mrabarnett.plus.com>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
	<gmun7c$puu$1@ger.gmane.org> <4992EA9C.4010207@mrabarnett.plus.com>
Message-ID: <f257b9ab0902111058y3b8c94day18020173c81cc8da@mail.gmail.com>

>because the traceback says the index is 0 and there's only one line with a 0 in it!
Indeed. Thank you.


On Wed, Feb 11, 2009 at 7:11 AM, MRAB <google at mrabarnett.plus.com> wrote:
> Steve Holden wrote:
>>
>> Matthew Sacks wrote:
>>>
>>> Hi List,
>>> I am getting an index out of range error when trying to parse with
>>> getopt.
>>> Probably something simple. Any suggestions are appreciated
>>>
>>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>>
>>>
>>> #Assign Opts
>>> connectPassword = optlist[0][1]
>>> adminServerURL = optlist[1][1]
>>> action = optlist[2][1]
>>> targets = optlist[3][1]
>>> appDir = optlist[4][1]
>>>
>>> #this statement never gets executed
>>> print "Args: " + connectPassword + " " + adminServerURL + " " + action
>>> + " " + targets + " " + appDir
>>>
>>>  File "/home/msacks/untitled4.py", line 23, in ?
>>> IndexError: index out of range: 0
>>>
>> It might help a little if you made it more obvious which was line 23 ...
>>
> It a guess I'd say it was:
>
>    connectPassword = optlist[0][1]
>
> because the traceback says the index is 0 and there's only one line with a 0
> in it!
>
>> The real problem, though, is a misunderstanding of what getopt.getopt()
>> returns. The (option, value) pairs are only returned for options found
>> in the command line, so you can't guarantee there'll be four.
>>
>> Set your values to defaults, then adjust for those for which an option
>> is found in the list, as in the "typical usage" example in the Fine
>> Manual.
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wolfram.hinderer at googlemail.com  Wed Feb 11 14:24:22 2009
From: wolfram.hinderer at googlemail.com (wolfram.hinderer at googlemail.com)
Date: Wed, 11 Feb 2009 11:24:22 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <6262e755-412d-401b-9ddf-e9fb2bba617c@p20g2000yqi.googlegroups.com>

On 10 Feb., 21:28, r0g <aioe.... at technicalbloke.com> wrote:

> def inet2ip(n, l=[], c=4):
> ? if c==0: return ".".join(l)
> ? p = 256**( c-1 )
> ? l.append( str(n/p) )
> ? return inet2ip( n-(n/p)*p, l, c-1 )

> The results for 10000
> iterations of each were as follows...
>
> 0.113744974136 seconds for old INET->IP method
> 27.7441999912 seconds for new INET->IP method
>
> :-/

That's probably because your new function is broken:

>>> def inet2ip(n, l=[], c=4):
  if c==0: return ".".join(l)
  p = 256**( c-1 )
  l.append( str(n/p) )
  return inet2ip( n-(n/p)*p, l, c-1 )

>>> inet2ip(0)
'0.0.0.0'
>>> inet2ip(0)
'0.0.0.0.0.0.0.0'
>>> inet2ip(0)
'0.0.0.0.0.0.0.0.0.0.0.0'



From Scott.Daniels at Acm.Org  Wed Feb 11 14:31:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:31:40 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7xskml9t1r.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
	<7xskml9t1r.fsf@ruckus.brouhaha.com>
Message-ID: <zs2dnfp2E7yAug7UnZ2dnUVZ_rrinZ2d@pdx.net>

Paul Rubin wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> writes:
>> Seems like we may want to say things like, "synchronization points are
>> too be silently ignored."
> 
> That would completely break some useful possible applications, so should
> be avoided.
No, I mean that we, _the_users_of_the_interface_, may want to say, ....
That is, I'd like that behavior as an option.

-Scott David Daniels
Scott.Daniels at Acm.Org



From Scott.Daniels at Acm.Org  Wed Feb 11 14:34:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:34:46 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7xd4dpsvf7.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
	<8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>
	<7xd4dpsvf7.fsf@ruckus.brouhaha.com>
Message-ID: <zs2dnfV2E7xLug7UnZ2dnUVZ_rrinZ2d@pdx.net>

Paul Rubin wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> writes:
>> I suspect that is why such an interface never came up (If
>> you can clone states, then you can say: "compress this, then use the
>> resultant state to compress/decompress others." 
> 
> The zlib C interface supports something like that.  It is just not
> exported to the python application.  It should be.
Right, we are gathering ideas we'd like to see available to the Python
programmer in the new zlib / bz2 agglomeration that we are thinking of
building / proposing.

--Scott David Daniels
Scott.Daniels at Acm.Org


From marduk at letterboxes.org  Wed Feb 11 14:35:56 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 11 Feb 2009 14:35:56 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
Message-ID: <1234380956.18084.0.camel@localhost.localdomain>

On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> Having issue on Windows cmd.
> > Python.exe
> >>>a = u'\xf0'
> >>>print a
> 
> This gives a unicode error.
> 
> Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> from a windows batch.
> 
> Character should look like this "?".
> 
> Please help!

You forgot to paste the error.




From Scott.Daniels at Acm.Org  Wed Feb 11 14:36:59 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:36:59 -0800
Subject: zlib interface semi-broken
In-Reply-To: <Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
References: <mailman.9266.1234299464.3487.python-list@python.org>	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
Message-ID: <zs2dnfR2E7zGtQ7UnZ2dnUVZ_rrinZ2d@pdx.net>

Scott David Daniels wrote:
> ... I've wanted to do some low-level (C-coded) search w/o bothering
> to create strings until a match....
Here's a more common use case: signature gathering on the contents.

--Scott David Daniels
Scott.Daniels at Acm.Org


From notvalid2 at sbcglobal.net  Wed Feb 11 14:38:04 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 11:38:04 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>
Message-ID: <_NFkl.10312$hc1.10101@flpi150.ffdc.sbc.com>

Mike Driscoll wrote:
> On Feb 11, 10:28 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> My program in IDLE bombed with:
>> ==============
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>    File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>      return self.func(*args)
>>    File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 552, in OperationalSettings
>>      dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>    File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 81, in __init__
>>      tkSimpleDialog.Dialog.__init__(self, parent)
>>    File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>      self.wait_visibility() # window needs to be visible for the grab
>>    File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>      self.tk.call('tkwait', 'visibility', window._w)
>> TclError: window ".34672232" was deleted before its visibility changed
>> ===============
>> It runs fine in pythonWin performing the same entry operation. Open a menu,
>>   select an item to open a dialog, select a select button in the dialog,
>> press OK to leave the dialog. Boom, as above.
>>
>> (This does not mean pythonWin doesn't have problems of its own. ) If I just
>> execute the code (double click on the py file, the console shows no
>> problems. IDLE is unhappy.
>>
>> Another side to this is that I use WinMerge to find differences between my
>> last saved copy and the current copy. I found the current copy had two lines
>> where a abc.get() was changed to abc.get. This was undoubtedly from briefly
>> using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble
>> executing the program. My guess is that while briefly editing there, I hit
>> some odd combination of keys that produced, perhaps, an invisible character
>> that pyWin ignores.
>>
>> Note the 34672232 window is a dialog that I closed by pressing OK. I would
>> again guess, that, if there is a problem, it occurs in the code that
>> destroys the dialog.

> 
> You don't really say what your code does or if it uses a GUI toolkit
> and if so, which one. But my guess is that you are using some kind of
> GUI and its GUI and IDLE's are clashing somehow. I see this sort of
> thing with some of my wxPython programs from time to time, although
> IDLE usually just crashes with no error message.
> 
> I would recommend using the command line or something that can open it
> in a completely separate process, such as Wingware's IDE.
> 
> Mike
Tkinter. Isn't just clicking on the py file enough to side step either of 
the two? I did it and it worked fine. The code is for a GUI that has five or 
  so menus on the main window bar, and manipulates video that is downloaded 
to it from a video camera. The problem occurs in a dialog in which a user 
enters configuration values, like the time to start/stop the camera. As soon 
as I press OK on the dialog the program dies as above. It wasn't doing that 
at all for days despite some heavy editing. A WinMerge shows its quite 
faithful to it's last working predecessor. That's how I found the get problem.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 14:39:29 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 11:39:29 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <mailman.9340.1234370960.3487.python-list@python.org>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
Message-ID: <iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> My program in IDLE bombed with:
>> ==============
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>     return self.func(*args)
>>   File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 552, in OperationalSettings
>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>   File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 81, in __init__
>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>     self.wait_visibility() # window needs to be visible for the grab
>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>     self.tk.call('tkwait', 'visibility', window._w)
>> TclError: window ".34672232" was deleted before its visibility changed
>> ===============
>> It runs fine in pythonWin performing the same entry operation. Open a
>> menu,  select an item to open a dialog, select a select button in the
>> dialog, press OK to leave the dialog. Boom, as above.
>>
>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>> just execute the code (double click on the py file, the console shows no
>> problems. IDLE is unhappy.
>>
>> Another side to this is that I use WinMerge to find differences between
>> my last saved copy and the current copy. I found the current copy had
>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>> had no trouble executing the program. My guess is that while briefly
>> editing there, I hit some odd combination of keys that produced,
>> perhaps, an invisible character that pyWin ignores.
>>
>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>> would again guess, that, if there is a problem, it occurs in the code
>> that destroys the dialog.
>>
>>
> Well you have to remember that you are trying to run a windowed GUI
> under the control of another windows GUI, so it isn't surprising that
> you hit trouble.
> 
> With IDLE the issue will be that IDLE already created a main window
> before your program started running. With PythonWin you are using two
> different toolkits, so it isn't really surprising that breaks down -
> there will be two entirely separate main loops competing with each other.
> 
> regards
>  Steve
Not quite. I take down IDLE when I run pyWin, and vice versa.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From namire at gmail.com  Wed Feb 11 14:44:25 2009
From: namire at gmail.com (namire)
Date: Wed, 11 Feb 2009 11:44:25 -0800 (PST)
Subject: Replace unknow string varible in file.
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
	<mailman.9286.1234307028.3487.python-list@python.org>
Message-ID: <ee6ee71d-4b9e-47d3-80b0-708b081d616a@o11g2000yql.googlegroups.com>

Thanks to Vlastimil Brom for his example and r0g for his helpful
attitude and hyperlinks I was able to made program do what was
needed.  Terry the comments in the html are not important I was just
saying that if I could cover the undesired strings in html comment
tags then they would not should up on a web browser viewing the file,
lucky I get then erased also so the comments is not needed.  I anyone
wants I can post a pastebin the the full code that uses the regex's.


From jfabiani at yolo.com  Wed Feb 11 14:44:25 2009
From: jfabiani at yolo.com (John Fabiani)
Date: Wed, 11 Feb 2009 11:44:25 -0800
Subject: openOffic, windows, and Python 2.5
Message-ID: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>

Hi,
OpenOffice 3 on windows uses python 2.3.x (I have no idea why).  Does anyone
know where I can get whatever is needed to get python 2.5 working.  I don't
want to learn how recompile openoffice because it has a steep learning
curve and is just to much when I can just use M$ word.

BTW using the openSUSE update to install openOffice3 uses my installed
python.  

Maybe someone has already done the compile and is willing to share?

Thanks in advance
Johnf  


From jeffgemail at gmail.com  Wed Feb 11 14:50:32 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 11:50:32 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
Message-ID: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>

On Feb 11, 2:35?pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > Having issue on Windows cmd.
> > > Python.exe
> > >>>a = u'\xf0'
> > >>>print a
>
> > This gives a unicode error.
>
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
>
> > Character should look like this "?".
>
> > Please help!
>
> You forgot to paste the error.

The error looks like this:
    File "<stdin", line 1, in <module>
    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
      return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
position 0
: character maps to <undefined>


Running Python 2.5.4 on Windows XP


From steve at holdenweb.com  Wed Feb 11 14:51:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 14:51:50 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
Message-ID: <gmva99$3ds$1@ger.gmane.org>

W. eWatson wrote:
> Steve Holden wrote:
>> W. eWatson wrote:
>>> My program in IDLE bombed with:
>>> ==============
>>> Exception in Tkinter callback
>>> Traceback (most recent call last):
>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>     return self.func(*args)
>>>   File
>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>
>>> line 552, in OperationalSettings
>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>   File
>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>
>>> line 81, in __init__
>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>     self.wait_visibility() # window needs to be visible for the grab
>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>     self.tk.call('tkwait', 'visibility', window._w)
>>> TclError: window ".34672232" was deleted before its visibility changed
>>> ===============
>>> It runs fine in pythonWin performing the same entry operation. Open a
>>> menu,  select an item to open a dialog, select a select button in the
>>> dialog, press OK to leave the dialog. Boom, as above.
>>>
>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>> just execute the code (double click on the py file, the console shows no
>>> problems. IDLE is unhappy.
>>>
>>> Another side to this is that I use WinMerge to find differences between
>>> my last saved copy and the current copy. I found the current copy had
>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>> had no trouble executing the program. My guess is that while briefly
>>> editing there, I hit some odd combination of keys that produced,
>>> perhaps, an invisible character that pyWin ignores.
>>>
>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>> would again guess, that, if there is a problem, it occurs in the code
>>> that destroys the dialog.
>>>
>>>
>> Well you have to remember that you are trying to run a windowed GUI
>> under the control of another windows GUI, so it isn't surprising that
>> you hit trouble.
>>
>> With IDLE the issue will be that IDLE already created a main window
>> before your program started running. With PythonWin you are using two
>> different toolkits, so it isn't really surprising that breaks down -
>> there will be two entirely separate main loops competing with each other.
>>
> Not quite. I take down IDLE when I run pyWin, and vice versa.
> 
The two separate loops being PyWin (which uses MFC) and your program
(which uses Tkinter). You just can't mix GUIs in the same process like
that, sorry.

regards
 Stedve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Shawn at Milochik.com  Wed Feb 11 14:55:14 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 11 Feb 2009 14:55:14 -0500
Subject: re.sub and named groups
In-Reply-To: <gmt4tk$jph$1@panix3.panix.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<gmt4tk$jph$1@panix3.panix.com>
Message-ID: <2dc0c81b0902111155r3bf37a03j86023099a9ce1a00@mail.gmail.com>

>
> Book recommendation: _Mastering Regular Expressions_, Jeffrey Friedl
> --
> Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

I wholeheartedly second this! The third edition is out now.


From stef.mientki at gmail.com  Wed Feb 11 14:58:39 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 11 Feb 2009 20:58:39 +0100
Subject: hpw to convert a linux python script ?
Message-ID: <49932DEF.3000102@gmail.com>

hello,

I've a python script, written for some Linux version,
now I want to run it under windows.
It complains of not finding files in
  /usr/share/tinybldLin/  ....
where .... is the directory where the script is located and started from.

As there are a whole lot of these lines, in a whole lot of files,
I wonder if there's a simple trick to point
  /usr/share/tinybldLin/
to my directory ?


thanks,
Stef


From http  Wed Feb 11 14:58:45 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 11:58:45 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
	<7xskml9t1r.fsf@ruckus.brouhaha.com>
	<zs2dnfp2E7yAug7UnZ2dnUVZ_rrinZ2d@pdx.net>
Message-ID: <7xtz70agp6.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> >> Seems like we may want to say things like, "synchronization points are
> >> too be silently ignored."
> No, I mean that we, _the_users_of_the_interface_, may want to say, ....
> That is, I'd like that behavior as an option.

I don't see any reason to want that (rather than letting the application
handle it) but I'll take your word for it.


From Graham.Dumpleton at gmail.com  Wed Feb 11 14:59:33 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 11 Feb 2009 11:59:33 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
Message-ID: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>

On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
> Hi,
>
> I am building some computational web services using soaplib. This
> creates a WSGI application.
>
> However, since some of these services are computationally intensive,
> and may be long running, I was looking for a way to use multiple
> processes. I thought about using multiprocessing.Process manually in
> the service, but I was a bit worried about how that might interact
> with a threaded server (I was hoping the thread serving that request
> could just wait until the child is finished). Also it would be good to
> keep the services as simple as possible so it's easier for people to
> write them.
>
> I have at the moment the following WSGI structure:
> TransLogger(URLMap(URLParser(soaplib objects)))
> although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> As I've found with all web-related Python stuff, I'm overwhelmed by
> the choice and number of alternatives. I've so far been using cherrypy
> and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> What would be the simplest [quickest to setup and fewest details of
> the server required - ideally with a simple example] and most reliable
> [this will eventually be 'in production' as part of a large scientific
> project] way to host this sort of WSGI with a process-per-request
> style?

In this sort of situation one wouldn't normally do the work in the
main web server, but have a separarte long running daemon process
embedding mini web server that understands XML-RPC. The main web
server would then make XML-RPC requests against the backend daemon
process, which would use threading and or queueing to handle the
requests.

If the work is indeed long running, the backend process would normally
just acknowledge the request and not wait. The web page would return
and it would be up to user to then somehow occassionally poll web
server, manually or by AJAX, to see how progres is going. That is,
further XML-RPC requests from main server to backend daemon process
asking about progress.

I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
are really appropriate as you don't want this done in web server
processes as then you are at mercy of web server processes being
killed or dying when part way through something. Some of these systems
will do this if requests take too long. Thus better to offload real
work to another process.

Graham


From martin at marcher.name  Wed Feb 11 15:00:32 2009
From: martin at marcher.name (Martin)
Date: Wed, 11 Feb 2009 21:00:32 +0100
Subject: Could you recommend job schedulling solution?
In-Reply-To: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
References: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
Message-ID: <5fa6c12e0902111200t5c29d6bbpefbfe1bfd29b987e@mail.gmail.com>

Hi,

2009/2/11 redbaron <ivanov.maxim at gmail.com>:
> should accept network
> connection with new tasks without blocking of client and put it on job
> queue.
>
> What is "task" ? Executing just ordinary python function will be
> enough. If solution contain some client library which allow easy task
> submit it will be great.

I think parallel python will take of that for you
(http://www.parallelpython.com/)

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From benjamin.kaplan at case.edu  Wed Feb 11 15:08:50 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 15:08:50 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
	<53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
Message-ID: <ec96e1390902111208w319e6d8blfc465da16293b397@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:50 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 2:35 pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> > On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > > Having issue on Windows cmd.
> > > > Python.exe
> > > >>>a = u'\xf0'
> > > >>>print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > You forgot to paste the error.
>
> The error looks like this:
>    File "<stdin", line 1, in <module>
>    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
>      return codecs.charmap_encode(input,errors,encoding_map)
> UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
> position 0
> : character maps to <undefined>
>
>
> Running Python 2.5.4 on Windows XP



That isn't a python problem, it's a Windows problem. For "compatibility
reasons", Microsoft never added Unicode support to cmd.  When you do print
u'', python tries to convert the characters to the console encoding (the
really old cp437, not even the Windows standard cp1252), it messes up.
AFAIK, you'll have to use the chcp command to switch to an encoding that has
the character and then print u'\xf0'.encode(the_encoding) to get it to
display. There isn't any way around it- we've tried.


> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tenax.raccoon at gmail.com  Wed Feb 11 15:09:57 2009
From: tenax.raccoon at gmail.com (Jason)
Date: Wed, 11 Feb 2009 12:09:57 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
Message-ID: <ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>

On Feb 11, 5:16?am, bearophileH... at lycos.com wrote:
> christopher.saun... at durham.ac.uk (c d saunter):
>
> >I assume it is a feature of the compiler.<
>
> Yes it's a bug-prone antifeature that's probably a relic from C that
> doesn't have a concatenation operator among strings as Python does
> (+). So in Python it saves you to use + at the cost of possible bugs.
>
> Bye,
> bearophile

I've used this feature in C and Python when I want to wrap strings
without having a newlines in the strings... grouping the whole bunch
with a set of parenthesis to make the concatenation explicit.
Admittedly, I wouldn't be broken up if this feature became deprecated,
as

It does do a minor optimization in Python and most C compilers.  The
two string constants are concatenated when the code is parsed, rather
than when the code is executed.

>>> from dis import dis
>>> def f():
...   return 'This is '  'an example.'
...
>>> dis(f)
  2           0 LOAD_CONST               1 ('This is an example.')
              3 RETURN_VALUE
>>>

It's such a minor optimization, that you probably wouldn't see any
effect on your program.

  --Jason


From kmtracey at gmail.com  Wed Feb 11 15:16:05 2009
From: kmtracey at gmail.com (Karen Tracey)
Date: Wed, 11 Feb 2009 15:16:05 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
	<53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
Message-ID: <af3536270902111216p73808a16w989da8674bfadc8f@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:50 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 2:35 pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> > On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > > Having issue on Windows cmd.
> > > > Python.exe
> > > >>>a = u'\xf0'
> > > >>>print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > You forgot to paste the error.
>
> The error looks like this:
>    File "<stdin", line 1, in <module>
>    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
>      return codecs.charmap_encode(input,errors,encoding_map)
> UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
> position 0
> : character maps to <undefined>
>
>
> Running Python 2.5.4 on Windows XP
>

First, you may need to change your command prompt Properties->Font to use
Lucida Console rather than raster fonts.  Then you'll need to change the
code page using chcp to something that has a mapping for the character you
want. E.g.:

D:\>chcp
Active code page: 437

D:\>python
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = u'\xf0'
>>> print a
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\bin\Python2.5.2\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
position 0: character maps to <undefined>
>>> quit()

D:\>chcp 1252
Active code page: 1252

D:\>python
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = u'\xf0'
>>> print a
?
>>> quit()

D:\>

(Just changing the code page works to avoid the UnicodeEncodeError, but with
raster fonts that character displays as thee horizontal bars.)

Karen
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From kenneth.m.mcdonald at sbcglobal.net  Wed Feb 11 15:24:40 2009
From: kenneth.m.mcdonald at sbcglobal.net (Kenneth McDonald)
Date: Wed, 11 Feb 2009 14:24:40 -0600
Subject: access to MS Access password-protected database?
In-Reply-To: <1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>
References: <mailman.9336.1234368125.3487.python-list@python.org>
	<1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>
Message-ID: <12ABC69A-8E0D-4ED2-A941-471725DCBA55@sbcglobal.net>

Sorry for the vagueness.

I do have access to the file and can open it using Access. I haven't  
yet done anything involving Python and Access (or Python and Win  
interfacing, for that matter.)

Thanks,
Ken


On Feb 11, 2009, at 12:01 PM, imageguy wrote:

> On Feb 11, 10:43 am, Ken McDonald <kmmcdon... at medicine.wisc.edu>
> wrote:
>> Can anyone direct me towards a code snippet showing how to use Python
>> to insert data into a password-protected MS Access database? My  
>> google
>> searches have been uninformative for dbs that are password-protected.
>>
>> Thanks,
>> Ken
>
> You post is a little vague on specifics
> - do you actually have access to the db ?
> - can you open it with access ?
> - can you currently read records using python ?
>
> I am assuming you don't have access to the db through python, once you
> do the rest is straight forward.
>
> I use DSN-less connections.  This link below is quite helpful
> http://www.carlprothman.net/Default.aspx?tabid=90#ODBCDriverForAccess
>
> If you aren't using the adodbapi (part of the pywin32 package), you
> need to do something like this, assuming you access db is MS-Access
> 2000 and above.
>
> <untested>
> import win32com
> cnx = win32com.client.Dispatch('ADODB.connection')
>
> parms = {}
> parms['driver'] = '{Microsoft Access Driver (*.mdb)}'
> parms['dbase'] = path_to_mdb
> parms['sys_mdw'] = path_to_workgroup_security
> parms['uid'] = userid_defined_in_mdw
> parhs['pwd'] = pwd_for_uid_in_mdw
>
> cnxtr = 'Driver=%(driver)s; DBQ=%(dbase)s; SYSTEMDB=%(sys_mdw)s; UID=%
> (uid)s; PWD=%(pwd)s; ' % parms
> cnx.ConnectionString = cnxstr
> cnx.Open()
>
> </untested>
> once you have an ADO Connection, execute SQL directly on the
> connection like this
>
> cnx.Execute('INSERT INTO tablename (col1, col2) VALUES ('val1,
> val2);')
>
> Or alternatively you should create RecordSets and manipulate these.
>
> IF you need help understanding ADO I would recommend;
> http://www.w3schools.com/ado/default.asp
>
> The examples are translateable to Python.
> You create recordsets via;
> rs = win32com.client.Dispatch('ADO.RecordSet')
>
>
> If you don't have/weren't given the passwords to the DB, but you do
> have access to the workgroup file ('*.MDW') file that stores the uid/
> pwds and permission, then there are several third party tools that
> will recover these for you. Google is your friend.
>
> If you don't have access to the original .mdw ... well, I can't help
> you and I don't think anyone can.
>
> Good luck.
> --
> http://mail.python.org/mailman/listinfo/python-list



From stojek at part-gmbh.de  Wed Feb 11 15:28:58 2009
From: stojek at part-gmbh.de (MarcusD)
Date: Wed, 11 Feb 2009 21:28:58 +0100
Subject: Clearing the keyboard buffer (wxPython)
Message-ID: <gmvceq$952$03$1@news.t-online.com>


Platform: MSW (XP) Python 2.5 wxPython 2.8
Topic: Clear Keyboard buffer

Hi,
I hope I am not off topic asking a wxpython question.
I'm writing a Score counter for Dart games. The software
shows graphical output on a Canvas and accepts keyboard
input (no buttons, no widgest). A stripped version looks
like that:

self.Bind(wx.EVT_CHAR,OnKeyEvent)
.
.
#--------------
    def OnKeyEvent(self, event):
      k =event.GetKeyCode()
      try:
        z=chr(k)
      except:
        return
      if (z in ["0","1","2","3","4","5","6","7","8","9",.."\r"..]:
        self.keystr +=z
        score=self.CalculateScore(self.keystr)
        self.DisplayScore(score)
        .
        .
      if z== "\r" #enter
        self.SayScore(score)
        self.NextPlayer()
#--------------
    def SayScore(self,number):
      if number > 100:
        a=os.path.join(self.wavpath,"100.wav")
        b=os.path.join(self.wavpath,"%i.wav"%(number-100))
      else:
        a=os.path.join(self.wavpath,"%i.wav"%(number))
        b=""
      sound1 = wx.Sound(a)
      sound2 = wx.Sound(b)
      sound1.Play(wx.SOUND_SYNC)
      if b:
        sound2.HurryupandPlay(wx.SOUND_SYNC)
#--------------

The problem is, that during the voice output all keystrokes
are buffered somewhere and are processed when SayScore is
finished. So I have to clear the keyboard buffer at the end
of SayScore. Something like:

  evt=MagicFetchPendingKeyEventFunction()
  while evt:
    evt=MagicFetchPendingKeyEventFunction()

I was thinking about threading (maybe using delayedresults), but
this might be a little oversized for my problem.
Playing the sound ASYNC doesn't work here.

Any ideas?
Thanks in advance
Marcus




From aleksandr.goretoy at gmail.com  Wed Feb 11 15:35:52 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Wed, 11 Feb 2009 14:35:52 -0600
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>

GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
managing a server and all it's services this way as well. Just manage dns
entries. Although, there are limitations depending on your project needs of
what libs you need to use.

appengine.google.com

-Alex Goretoy
http://www.goretoy.com



On Wed, Feb 11, 2009 at 1:59 PM, Graham Dumpleton <
Graham.Dumpleton at gmail.com> wrote:

> On Feb 11, 8:50 pm, Robin <robi... at gmail.com> wrote:
> > Hi,
> >
> > I am building some computational web services using soaplib. This
> > creates a WSGI application.
> >
> > However, since some of these services are computationally intensive,
> > and may be long running, I was looking for a way to use multiple
> > processes. I thought about using multiprocessing.Process manually in
> > the service, but I was a bit worried about how that might interact
> > with a threaded server (I was hoping the thread serving that request
> > could just wait until the child is finished). Also it would be good to
> > keep the services as simple as possible so it's easier for people to
> > write them.
> >
> > I have at the moment the following WSGI structure:
> > TransLogger(URLMap(URLParser(soaplib objects)))
> > although presumably, due to the beauty of WSGI, this shouldn't matter.
> >
> > As I've found with all web-related Python stuff, I'm overwhelmed by
> > the choice and number of alternatives. I've so far been using cherrypy
> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > What would be the simplest [quickest to setup and fewest details of
> > the server required - ideally with a simple example] and most reliable
> > [this will eventually be 'in production' as part of a large scientific
> > project] way to host this sort of WSGI with a process-per-request
> > style?
>
> In this sort of situation one wouldn't normally do the work in the
> main web server, but have a separarte long running daemon process
> embedding mini web server that understands XML-RPC. The main web
> server would then make XML-RPC requests against the backend daemon
> process, which would use threading and or queueing to handle the
> requests.
>
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
>
> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> are really appropriate as you don't want this done in web server
> processes as then you are at mercy of web server processes being
> killed or dying when part way through something. Some of these systems
> will do this if requests take too long. Thus better to offload real
> work to another process.
>
> Graham
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From johannalecschueler at googlemail.com  Wed Feb 11 15:37:05 2009
From: johannalecschueler at googlemail.com (Alec Schueler)
Date: Wed, 11 Feb 2009 12:37:05 -0800 (PST)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org>
Message-ID: <8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>

On Feb 11, 7:58?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> As there are a whole lot of these lines, in a whole lot of files,
> I wonder if there's a simple trick to point
> ? /usr/share/tinybldLin/
> to my directory ?
>
> thanks,
> Stef

Find and replace?


From kyosohma at gmail.com  Wed Feb 11 15:45:56 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 12:45:56 -0800 (PST)
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
Message-ID: <d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>

On Feb 11, 2:28?pm, "MarcusD" <sto... at part-gmbh.de> wrote:
> Platform: MSW (XP) Python 2.5 wxPython 2.8
> Topic: Clear Keyboard buffer
>
> Hi,
> I hope I am not off topic asking a wxpython question.
> I'm writing a Score counter for Dart games. The software
> shows graphical output on a Canvas and accepts keyboard
> input (no buttons, no widgest). A stripped version looks
> like that:
>
> self.Bind(wx.EVT_CHAR,OnKeyEvent)
> .
> .
> #--------------
> ? ? def OnKeyEvent(self, event):
> ? ? ? k =event.GetKeyCode()
> ? ? ? try:
> ? ? ? ? z=chr(k)
> ? ? ? except:
> ? ? ? ? return
> ? ? ? if (z in ["0","1","2","3","4","5","6","7","8","9",.."\r"..]:
> ? ? ? ? self.keystr +=z
> ? ? ? ? score=self.CalculateScore(self.keystr)
> ? ? ? ? self.DisplayScore(score)
> ? ? ? ? .
> ? ? ? ? .
> ? ? ? if z== "\r" #enter
> ? ? ? ? self.SayScore(score)
> ? ? ? ? self.NextPlayer()
> #--------------
> ? ? def SayScore(self,number):
> ? ? ? if number > 100:
> ? ? ? ? a=os.path.join(self.wavpath,"100.wav")
> ? ? ? ? b=os.path.join(self.wavpath,"%i.wav"%(number-100))
> ? ? ? else:
> ? ? ? ? a=os.path.join(self.wavpath,"%i.wav"%(number))
> ? ? ? ? b=""
> ? ? ? sound1 = wx.Sound(a)
> ? ? ? sound2 = wx.Sound(b)
> ? ? ? sound1.Play(wx.SOUND_SYNC)
> ? ? ? if b:
> ? ? ? ? sound2.HurryupandPlay(wx.SOUND_SYNC)
> #--------------
>
> The problem is, that during the voice output all keystrokes
> are buffered somewhere and are processed when SayScore is
> finished. So I have to clear the keyboard buffer at the end
> of SayScore. Something like:
>
> ? evt=MagicFetchPendingKeyEventFunction()
> ? while evt:
> ? ? evt=MagicFetchPendingKeyEventFunction()
>
> I was thinking about threading (maybe using delayedresults), but
> this might be a little oversized for my problem.
> Playing the sound ASYNC doesn't work here.
>
> Any ideas?
> Thanks in advance
> Marcus
It's fine to post here with wxPython questions, but I would recommend
the official wxPython mailing list in most cases as it has lots of
experienced users and developers on it: http://wxpython.org/maillist.php

I've never done this sort of thing with wxPython, but you may be able
to use wx.Yield somehow. There are various tips and tricks in the wiki
about working around long running processes that block the GUI's
mainloop here:

http://wiki.wxpython.org/LongRunningTasks

Other than that, I would recommend doing this with pygame or pyglet as
they might be easier to use for this use-case. Here are their sites:

http://www.pyglet.org/
http://www.pygame.org/news.html

HTH

Mike


From stef.mientki at gmail.com  Wed Feb 11 15:48:14 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 11 Feb 2009 21:48:14 +0100
Subject: hpw to convert a linux python script ?
In-Reply-To: <8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
Message-ID: <4993398E.1040909@gmail.com>

Alec Schueler wrote:
> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>   
>> As there are a whole lot of these lines, in a whole lot of files,
>> I wonder if there's a simple trick to point
>>   /usr/share/tinybldLin/
>> to my directory ?
>>
>> thanks,
>> Stef
>>     
>
> Find and replace?
>   
well I was thinking of a more elegant way,
so the scripts remains, or better become multi-platform.

anyway thanks,
Stef
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From stojek at part-gmbh.de  Wed Feb 11 15:54:55 2009
From: stojek at part-gmbh.de (MarcusD)
Date: Wed, 11 Feb 2009 21:54:55 +0100
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
Message-ID: <gmvdve$c32$03$1@news.t-online.com>

Whow. Thanks for the fast and comprehensive answer. To be honest I would 
have posted to wxpython.org but the server seems to be down for the last 
couple of days.

I'll check this wx.Yield thing that I never heard of. And let's see what 
else we get here.
Thanks again
marcus 




From martin at v.loewis.de  Wed Feb 11 15:57:26 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 11 Feb 2009 21:57:26 +0100
Subject: Unicode issue on Windows cmd line
In-Reply-To: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
Message-ID: <49933bb6$0$3304$9b622d9e@news.freenet.de>

> Having issue on Windows cmd.
>> Python.exe
>>>> a = u'\xf0'
>>>> print a
> 
> This gives a unicode error.
> 
> Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> from a windows batch.
> 
> Character should look like this "?".
> 
> Please help!

Well, your terminal just cannot display this character by default; you
need to use a different terminal program, or reconfigure your terminal.

For example, do

chcp 1252

and select Lucida Console as the terminal font, then try again.

Of course, this will cause *different* characters to become
non-displayable.

Regards,
Martin


From bearophileHUGS at lycos.com  Wed Feb 11 15:57:31 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 11 Feb 2009 12:57:31 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
	<ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>
Message-ID: <71e3e031-de35-4f7b-91e9-1c14436d36f1@j38g2000yqa.googlegroups.com>

Jason:
> It's such a minor optimization, that you probably wouldn't see any
> effect on your program.

>>> from dis import dis
>>> def f():
...  return 'This is ' + 'an example.'
...
>>> dis(f)
  2           0 LOAD_CONST               3 ('This is an example.')
              3 RETURN_VALUE

Bye,
bearophile


From gervaz at gmail.com  Wed Feb 11 16:01:26 2009
From: gervaz at gmail.com (mattia)
Date: 11 Feb 2009 21:01:26 GMT
Subject: Library similar to UserAgent (perl)
Message-ID: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>

Hi everybody, I'm looking for an easy way to put data in a form, then 
click the button and follow the redirect. Also I need to use cookies. I 
read that using perl this can be done using the UserAgent lib, that also 
provide th browser functionality to let the site believe that you are 
getting the pages from a normali browser like ff. Any suggestion? I think 
that the main concen is to easilly put the data in the numerous textlabel 
provided and then magically simulate the 'click me' button.


From rdmurray at bitdance.com  Wed Feb 11 16:05:00 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 11 Feb 2009 21:05:00 +0000 (UTC)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<4993398E.1040909@gmail.com>
Message-ID: <gmvehs$jp1$1@ger.gmane.org>

Stef Mientki <stef.mientki at gmail.com> wrote:
> Alec Schueler wrote:
> > On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> >   
> >> As there are a whole lot of these lines, in a whole lot of files,
> >> I wonder if there's a simple trick to point
> >>   /usr/share/tinybldLin/
> >> to my directory ?
> >>
> >> thanks,
> >> Stef
> >>     
> >
> > Find and replace?
> >   
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.
> 
> anyway thanks,

Well, you'll have to rewrite the script so that it doesn't make
assumptions about path names, and we can't help you with that without
seeing some of the script code.  There _might_ be easy fixes, but if the
path is hardcoded in many places in the script...then you will just have
to go through and un-hard-code it.

--RDM



From ptmcg at austin.rr.com  Wed Feb 11 16:05:53 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 11 Feb 2009 13:05:53 -0800 (PST)
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>

On Feb 4, 10:51?am, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
> Hi everybody,
>
> I'm having a ball with the power of regular expression

Don't forget the ball you can have with the power of ordinary Python
strings, string methods, and string interpolation!

originalString = "spam:%(first)s ham:%(second)s"
print originalString % { "first" : "foo" , "second" : "" }

prints

spam:foo ham:

with far fewer surprises and false steps.  (Note: Py3K supports this
same feature, but with different interpolation syntax, which I have
not learned yet.)

Book recommendation: Text Processing in Python, by David Mertz (free
online - http://gnosis.cx/TPiP/), in which David advises against
dragging out the RE heavy artillery until you've at least thought
about using ordinary string methods.

-- Paul


From kyosohma at gmail.com  Wed Feb 11 16:05:57 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 13:05:57 -0800 (PST)
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
	<gmvdve$c32$03$1@news.t-online.com>
Message-ID: <dd0a705e-83a5-4818-ae4a-cc0674680b21@t11g2000yqg.googlegroups.com>

On Feb 11, 2:54?pm, "MarcusD" <sto... at part-gmbh.de> wrote:
> Whow. Thanks for the fast and comprehensive answer. To be honest I would
> have posted to wxpython.org but the server seems to be down for the last
> couple of days.
>
> I'll check this wx.Yield thing that I never heard of. And let's see what
> else we get here.
> Thanks again
> marcus

Is it? I wondered why I had suddenly stopped getting emails from them,
but my company recently had some email config changes that blocked a
ton of stuff and I just figured that was part of the problem.
Hopefully Robin Dunn can put the smack down on his web hosts...

Mike


From benjamin.kaplan at case.edu  Wed Feb 11 16:06:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:06:43 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <4993398E.1040909@gmail.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<4993398E.1040909@gmail.com>
Message-ID: <ec96e1390902111306w56a35651h5bf996fa9fe70fd7@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:48 PM, Stef Mientki <stef.mientki at gmail.com>wrote:

> Alec Schueler wrote:
>
>> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>>
>>
>>> As there are a whole lot of these lines, in a whole lot of files,
>>> I wonder if there's a simple trick to point
>>>  /usr/share/tinybldLin/
>>> to my directory ?
>>>
>>> thanks,
>>> Stef
>>>
>>>
>>
>> Find and replace?
>>
>>
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.



That's the problem with using external files- unless you can get to the file
by some combination of os and os.path functions, you're pretty much stuck
checking os.name and/or sys.platform and choosing filenames based on that.
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From benjamin.kaplan at case.edu  Wed Feb 11 16:10:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:10:43 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <49933bb6$0$3304$9b622d9e@news.freenet.de>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
Message-ID: <ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:57 PM, "Martin v. L?wis" <martin at v.loewis.de>wrote:

> > Having issue on Windows cmd.
> >> Python.exe
> >>>> a = u'\xf0'
> >>>> print a
> >
> > This gives a unicode error.
> >
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
> >
> > Character should look like this "?".
> >
> > Please help!
>
> Well, your terminal just cannot display this character by default; you
> need to use a different terminal program, or reconfigure your terminal.
>
> For example, do
>
> chcp 1252
>
> and select Lucida Console as the terminal font, then try again.
>
> Of course, this will cause *different* characters to become
> non-displayable.


Well,

>
>
> Regards,
> Martin
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Wed Feb 11 16:13:22 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:13:22 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
Message-ID: <ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>

On Wed, Feb 11, 2009 at 4:10 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Wed, Feb 11, 2009 at 3:57 PM, "Martin v. L?wis" <martin at v.loewis.de>wrote:
>
>> > Having issue on Windows cmd.
>> >> Python.exe
>> >>>> a = u'\xf0'
>> >>>> print a
>> >
>> > This gives a unicode error.
>> >
>> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
>> > from a windows batch.
>> >
>> > Character should look like this "?".
>> >
>> > Please help!
>>
>> Well, your terminal just cannot display this character by default; you
>> need to use a different terminal program, or reconfigure your terminal.
>>
>> For example, do
>>
>> chcp 1252
>>
>> and select Lucida Console as the terminal font, then try again.
>>
>> Of course, this will cause *different* characters to become
>> non-displayable.
>
>
> Well,
>

Whoops. Didn't mean to hit send there. I was going to say, you can't have
everything when Microsoft is only willing to break the programs that average
people are going to use on a daily basis. I mean, why would they do
something nice for the international community at the expense of breaking
some 20 year old batch scripts? Those were the only things that still worked
when Vista first came out.



>>
>> Regards,
>> Martin
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From tjreedy at udel.edu  Wed Feb 11 16:22:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 16:22:25 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
	<gmu5sr$t8q$1@ger.gmane.org>
	<1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>
Message-ID: <gmvfid$o23$1@ger.gmane.org>

andrew cooke wrote:
> Terry Reedy wrote:
>> Reverse the test order
>>
>> def fact(n):
>>      if n > 0: return fact(n-1)*n
>>      if n == 0: return 1
>>      raise ValueError
> 
> sweet!  but is this generally possible?

I believe so, for some meaning of 'generally'.

 > ie: did you think this up for
> this question or is it an idiom that you find yourself using often?

It is an idiom I developed for an algorithm book-in-progress that will 
include  detailed comparisons of 'body' recursive (my term for 'not tail 
recursive", such as fact() above), tail recursive, and iterative 
versions of algorithms.

Here are written-for-didactic-purposes tail and iterative versions of 
fact that are computationally equivalent to the above in that they 
compute the same expression, (...((1*1)*2)*....*n), without commutative 
or associative transformation, and raise the same error (expanded).

def fact_tail(n, i=0, res=1):
     if i < n: return fact_tail(n, i+1, res*(i+1))
     if i == n: return res
     raise ValueError("Input negative or non-integral")

def fact_iter(n, i=0, res=1):
     while i < n: i,res = i+1, res*(i+1)
     if i == n: return res
     raise ValueError("Input negative or non-integral")

My original reason for writing the tail recursion in the same reversed 
order was to make the conversion to iteration as obvious as possible. 
But I them noticed that it also made possible 'test once for bad input 
without a separate function."

Terry Jan Reedy



From sjmachin at lexicon.net  Wed Feb 11 16:25:07 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 13:25:07 -0800 (PST)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org> 
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com> 
	<mailman.9352.1234385290.3487.python-list@python.org>
Message-ID: <1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>

On Feb 12, 7:48?am, Stef Mientki <stef.mien... at gmail.com> wrote:
> Alec Schueler wrote:
> > On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>
> >> As there are a whole lot of these lines, in a whole lot of files,
> >> I wonder if there's a simple trick to point
> >> ? /usr/share/tinybldLin/
> >> to my directory ?
>
> >> thanks,
> >> Stef
>
> > Find and replace?
>
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.

Your current setup is not even single-platform portable ... consider
the scenario where some Linux admin wants your gear to live in some
directory other than /usr/share/tinybldLin/

The standard technique for ensuring that kind of portability involves:
1. Find the directory in which your script lives. Inspect sys.argv[0],
use some os.path.some_functionality() to extract the directory, name
it (say) home_base.
2. When you want to open a data file in the script's directory, do
this:
   the_path = os.path.join(home_base, 'stef1.dat')
   f = open(the_path, .....)

NOTE: Use os.path.join() instead of some DIY technique; it knows
better than you what the path separator is on the OS it's being run
on. In fact, read the whole of the os.path manual carefully before you
jump in to changing your code.

If you prefer to have the data files in (say) .../script_locn/data
instead of .../script_locn, the adjustment should be obvious.

Unfortunately, you are still going to need use find and replace to fix
your script. Code in haste, repent at leisure :-)

HTH,
John





From sevillad at gmail.com  Wed Feb 11 16:27:07 2009
From: sevillad at gmail.com (David Sevilla)
Date: Wed, 11 Feb 2009 13:27:07 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<df45ffa9-6796-4984-a718-bb520ad944de@v13g2000vbb.googlegroups.com>
Message-ID: <604aa733-8e19-4e07-8dde-277d38dde1be@v39g2000yqm.googlegroups.com>

> On Feb 3, 7:30?pm, andrew cooke <and... at acooke.org> wrote:
>
> > the exact details of what you are reporting seem a bit odd, but i have
> > seen a similar error because i have tried to use my own account to
> > install the package, instead of using root.
>
> > what i believe happens is that easy_install first tries to create the
> > "test" file, and then checks it is there. ?if it is not there, you get
> > an error. ?normally the error explains that you need to run as root,
> > but i assume in your case it doesn't - that seems odd, but it seemed
> > worth mentioning anyway.
>
> > so if you have not done so, instead of
>
> > ? python setup.py install
>
> > do
>
> > ? sudo python setup.py install
>
> > more generally, i have used opensuse 11.0 and 11.1, and generally
> > things work just fine, so i would check you are following all the
> > instructions correctly.
>
> > good luck,
> > andrew

Well, finally it worked. I even uninstalled python and all related
stuff with yast2, installed it all again, then

wget http://peak.telecommunity.com/dist/ez_setup.py
su
/path/to/python ez_setup.py

and I got the same error: a certain file could not be created, and

 /usr/local/lib/python2.5/site-packages/

does not exist. Well, I just created them manually (/usr/local/lib was
empty) and it worked.

When I tried to use easy_install for mnemosyne, I got the same error
_but_ this time I was told about running as root (I did it from
another terminal). Now I got it installed (still not working,
something called qt) but the python installation problem is solved.
Thank you very much to all those who contributed.

Regards,

David


From notvalid2 at sbcglobal.net  Wed Feb 11 16:27:24 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 13:27:24 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <mailman.9344.1234381941.3487.python-list@python.org>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
Message-ID: <uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> My program in IDLE bombed with:
>>>> ==============
>>>> Exception in Tkinter callback
>>>> Traceback (most recent call last):
>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>     return self.func(*args)
>>>>   File
>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>
>>>> line 552, in OperationalSettings
>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>   File
>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>
>>>> line 81, in __init__
>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>> ===============
>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>> menu,  select an item to open a dialog, select a select button in the
>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>
>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>> just execute the code (double click on the py file, the console shows no
>>>> problems. IDLE is unhappy.
>>>>
>>>> Another side to this is that I use WinMerge to find differences between
>>>> my last saved copy and the current copy. I found the current copy had
>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>> had no trouble executing the program. My guess is that while briefly
>>>> editing there, I hit some odd combination of keys that produced,
>>>> perhaps, an invisible character that pyWin ignores.
>>>>
>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>> would again guess, that, if there is a problem, it occurs in the code
>>>> that destroys the dialog.
>>>>
>>>>
>>> Well you have to remember that you are trying to run a windowed GUI
>>> under the control of another windows GUI, so it isn't surprising that
>>> you hit trouble.
>>>
>>> With IDLE the issue will be that IDLE already created a main window
>>> before your program started running. With PythonWin you are using two
>>> different toolkits, so it isn't really surprising that breaks down -
>>> there will be two entirely separate main loops competing with each other.
>>>
>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>>
> The two separate loops being PyWin (which uses MFC) and your program
> (which uses Tkinter). You just can't mix GUIs in the same process like
> that, sorry.
> 
> regards
>  Stedve
I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and 
pyWin are being run together.

Assume neither is running.
a. run IDLE, and execute program
b. close IDLE script, and interactive window. Kill py program
result: boom
c. run pyWin and execute program
d. do same as b for pyWin
resulst: all OK
e. repeat a and b.
Result: boom

Repeat the above and you get the same results.

I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above. 
I switched to it to see if it work there. It did. I double clicked on the py 
file, and it worked fine. Can you explain this?


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From shandy.b at gmail.com  Wed Feb 11 16:30:30 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 11 Feb 2009 13:30:30 -0800 (PST)
Subject: CPython loading modules into memory
Message-ID: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>

Can someone describe the details of how Python loads modules into
memory?  I assume once the .py file is compiled to .pyc that it is
mmap'ed in.  But that assumption is very naive.  Maybe it uses an
anonymous mapping?  Maybe it does other special magic?  This is all
very alien to me, so if someone could explain it in terms that a
person who never usually worries about memory could understand, that
would be much appreciated.

Follow up: is this process different if the modules are loaded from a
zipfile?

If there is a link that covers this info, that'd be great too.


From graham.dumpleton at gmail.com  Wed Feb 11 16:32:36 2009
From: graham.dumpleton at gmail.com (Graham Dumpleton)
Date: Thu, 12 Feb 2009 08:32:36 +1100
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
Message-ID: <88e286470902111332t50a60708g8bba776b0c7f5b69@mail.gmail.com>

2009/2/12 alex goretoy <aleksandr.goretoy at gmail.com>:
> GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
> managing a server and all it's services this way as well. Just manage dns
> entries. Although, there are limitations depending on your project needs of
> what libs you need to use.

GAE is not suitable as they kill off any requests that take more than
a set time. That time isn't that long, so can't support long running
requests.

Graham

> appengine.google.com
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
>
> On Wed, Feb 11, 2009 at 1:59 PM, Graham Dumpleton
> <Graham.Dumpleton at gmail.com> wrote:
>>
>> On Feb 11, 8:50 pm, Robin <robi... at gmail.com> wrote:
>> > Hi,
>> >
>> > I am building some computational web services using soaplib. This
>> > creates a WSGI application.
>> >
>> > However, since some of these services are computationally intensive,
>> > and may be long running, I was looking for a way to use multiple
>> > processes. I thought about using multiprocessing.Process manually in
>> > the service, but I was a bit worried about how that might interact
>> > with a threaded server (I was hoping the thread serving that request
>> > could just wait until the child is finished). Also it would be good to
>> > keep the services as simple as possible so it's easier for people to
>> > write them.
>> >
>> > I have at the moment the following WSGI structure:
>> > TransLogger(URLMap(URLParser(soaplib objects)))
>> > although presumably, due to the beauty of WSGI, this shouldn't matter.
>> >
>> > As I've found with all web-related Python stuff, I'm overwhelmed by
>> > the choice and number of alternatives. I've so far been using cherrypy
>> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
>> > What would be the simplest [quickest to setup and fewest details of
>> > the server required - ideally with a simple example] and most reliable
>> > [this will eventually be 'in production' as part of a large scientific
>> > project] way to host this sort of WSGI with a process-per-request
>> > style?
>>
>> In this sort of situation one wouldn't normally do the work in the
>> main web server, but have a separarte long running daemon process
>> embedding mini web server that understands XML-RPC. The main web
>> server would then make XML-RPC requests against the backend daemon
>> process, which would use threading and or queueing to handle the
>> requests.
>>
>> If the work is indeed long running, the backend process would normally
>> just acknowledge the request and not wait. The web page would return
>> and it would be up to user to then somehow occassionally poll web
>> server, manually or by AJAX, to see how progres is going. That is,
>> further XML-RPC requests from main server to backend daemon process
>> asking about progress.
>>
>> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
>> are really appropriate as you don't want this done in web server
>> processes as then you are at mercy of web server processes being
>> killed or dying when part way through something. Some of these systems
>> will do this if requests take too long. Thus better to offload real
>> work to another process.
>>
>> Graham
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>


From kyosohma at gmail.com  Wed Feb 11 16:33:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 13:33:26 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org> 
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org> 
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
Message-ID: <5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>

On Feb 11, 3:27?pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
> Steve Holden wrote:
> > W. eWatson wrote:
> >> Steve Holden wrote:
> >>> W. eWatson wrote:
> >>>> My program in IDLE bombed with:
> >>>> ==============
> >>>> Exception in Tkinter callback
> >>>> Traceback (most recent call last):
> >>>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> >>>> ? ? return self.func(*args)
> >>>> ? File
> >>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>>> line 552, in OperationalSettings
> >>>> ? ? dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> >>>> ? File
> >>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>>> line 81, in __init__
> >>>> ? ? tkSimpleDialog.Dialog.__init__(self, parent)
> >>>> ? File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> >>>> ? ? self.wait_visibility() # window needs to be visible for the grab
> >>>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> >>>> ? ? self.tk.call('tkwait', 'visibility', window._w)
> >>>> TclError: window ".34672232" was deleted before its visibility changed
> >>>> ===============
> >>>> It runs fine in pythonWin performing the same entry operation. Open a
> >>>> menu, ?select an item to open a dialog, select a select button in the
> >>>> dialog, press OK to leave the dialog. Boom, as above.
>
> >>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
> >>>> just execute the code (double click on the py file, the console shows no
> >>>> problems. IDLE is unhappy.
>
> >>>> Another side to this is that I use WinMerge to find differences between
> >>>> my last saved copy and the current copy. I found the current copy had
> >>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> >>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> >>>> had no trouble executing the program. My guess is that while briefly
> >>>> editing there, I hit some odd combination of keys that produced,
> >>>> perhaps, an invisible character that pyWin ignores.
>
> >>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
> >>>> would again guess, that, if there is a problem, it occurs in the code
> >>>> that destroys the dialog.
>
> >>> Well you have to remember that you are trying to run a windowed GUI
> >>> under the control of another windows GUI, so it isn't surprising that
> >>> you hit trouble.
>
> >>> With IDLE the issue will be that IDLE already created a main window
> >>> before your program started running. With PythonWin you are using two
> >>> different toolkits, so it isn't really surprising that breaks down -
> >>> there will be two entirely separate main loops competing with each other.
>
> >> Not quite. I take down IDLE when I run pyWin, and vice versa.
>
> > The two separate loops being PyWin (which uses MFC) and your program
> > (which uses Tkinter). You just can't mix GUIs in the same process like
> > that, sorry.
>
> > regards
> > ?Stedve
>
> I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and
> pyWin are being run together.
>
> Assume neither is running.
> a. run IDLE, and execute program
> b. close IDLE script, and interactive window. Kill py program
> result: boom
> c. run pyWin and execute program
> d. do same as b for pyWin
> resulst: all OK
> e. repeat a and b.
> Result: boom
>
> Repeat the above and you get the same results.
>
> I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above.
> I switched to it to see if it work there. It did. I double clicked on the py
> file, and it worked fine. Can you explain this?
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

What Steve (and I) are saying is that IDLE has it's own mainloop and
your program has a mainloop too as it sounds like it is running a
Tkinter app. Sometimes when you run a Tk app from another Tk app, the
two mainloops clash and have weird issue like this one.

If you just double-click it or run it from the command line, you only
have one mainloop (i.e. the one that's part of your app). Thus, no
conflicts.

Mike


From google at mrabarnett.plus.com  Wed Feb 11 16:34:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 11 Feb 2009 21:34:59 +0000
Subject: Unicode issue on Windows cmd line
In-Reply-To: <ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>	<49933bb6$0$3304$9b622d9e@news.freenet.de>	<ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
	<ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>
Message-ID: <49934483.3010000@mrabarnett.plus.com>

Benjamin Kaplan wrote:
[snip]
> Whoops. Didn't mean to hit send there. I was going to say, you can't 
> have everything when Microsoft is only willing to break the programs 
> that average people are going to use on a daily basis. I mean, why 
> would they do something nice for the international community at the 
> expense of breaking some 20 year old batch scripts? Those were the 
> only things that still worked when Vista first came out.
> 
I remember when I had to use MS-Access but it could be either of 2 versions.

The newer version couldn't open a database from the older version unless
I let it convert it first, after which point I wouldn't be able to open
it in the older version... :-(


From tjreedy at udel.edu  Wed Feb 11 16:44:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 16:44:12 -0500
Subject: openOffic, windows, and Python 2.5
In-Reply-To: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
Message-ID: <gmvgr7$s9n$1@ger.gmane.org>

John Fabiani wrote:
> Hi,
> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).

I presume because no one has volunteered to do the update for the Py-UNO 
bridge.  In any case, why do you consider that to be a problem.  It is 
common for apps to include the Python they are known to work with.

tjr



From robert.kern at gmail.com  Wed Feb 11 16:45:25 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 11 Feb 2009 15:45:25 -0600
Subject: CPython loading modules into memory
In-Reply-To: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
Message-ID: <gmvgtm$t1t$1@ger.gmane.org>

On 2009-02-11 15:30, sjbrown wrote:
> Can someone describe the details of how Python loads modules into
> memory?  I assume once the .py file is compiled to .pyc that it is
> mmap'ed in.  But that assumption is very naive.  Maybe it uses an
> anonymous mapping?  Maybe it does other special magic?  This is all
> very alien to me, so if someone could explain it in terms that a
> person who never usually worries about memory could understand, that
> would be much appreciated.

Python will read the .py file and compile into bytecode. This bytecode will be 
written out to a .pyc file as a caching mechanism; if the .pyc exists and has a 
newer timestamp than the .py file, the .py file will not be read or compiled. 
The bytecode will simply be read from the .pyc file.

The .pyc file is not really a map of a memory structure, per se. It is simply a 
disk representation of the bytecode. This bytecode is *executed* by the Python 
VM to populate a module's namespace (which is just a dict) in memory. I believe 
it is then discarded.

> Follow up: is this process different if the modules are loaded from a
> zipfile?

Only in that the .py or .pyc will be extracted from the zipfile instead of being 
read directly from disk.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From sjmachin at lexicon.net  Wed Feb 11 16:48:58 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 13:48:58 -0800 (PST)
Subject: getopt index out of range
References: <mailman.9249.1234293397.3487.python-list@python.org>
Message-ID: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>

On Feb 11, 6:16?am, Matthew Sacks <ntw... at gmail.com> wrote:
> Hi List,
> I am getting an index out of range error when trying to parse with getopt.
> Probably something simple. Any suggestions are appreciated
>
> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>
> #Assign Opts
> connectPassword = optlist[0][1]
> adminServerURL = optlist[1][1]
> action = optlist[2][1]
> targets = optlist[3][1]
> appDir = optlist[4][1]

As you have been told, it is blowing up on index 0. That is because
optlist is empty (in this case). optlist can contain anything from 0
items to as many as your user cares to type in. It is NOT limited to
the number of different options specified in the getopt call; consider
the case where the arg string is "--action add --action del". Further,
the contents of optlist are presented in the order they are typed in
by the user.

Consequently any attempt to give meaningful names to option values
using constant subscripting of optlist is prima facie an utter
nonsense.

It is a mind-bogglingly astonishing utter nonsense given the lengthy
conversation about getopt that we had in another thread yesterday.
What on earth are you doing???



From martin at v.loewis.de  Wed Feb 11 17:00:24 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 11 Feb 2009 23:00:24 +0100
Subject: CPython loading modules into memory
In-Reply-To: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
Message-ID: <49934A78.10309@v.loewis.de>

> Can someone describe the details of how Python loads modules into
> memory?  I assume once the .py file is compiled to .pyc that it is
> mmap'ed in.  But that assumption is very naive.  Maybe it uses an
> anonymous mapping?  Maybe it does other special magic?  This is all
> very alien to me, so if someone could explain it in terms that a
> person who never usually worries about memory could understand, that
> would be much appreciated.

There is no magic whatsoever. Python opens a sequential file descriptor
for the .pyc file, and then reads it in small chunks, "unmarshalling"
it (indeed, the marshal module is used to restore Python objects).

The marshal format is an object serialization in a type-value encoding
(sometimes type-length-value), with type codes for:
- None, True, False
- 32-bit ints, 64-bit ints (unmarshalled into int/long)
- floats, complex
- arbitrary-sized longs
- strings, unicode
- tuples (length + marshal data of values)
- lists
- dicts
- code objects
- a few others

Result of unmarshalling is typically a code object.

> Follow up: is this process different if the modules are loaded from a
> zipfile?

No; it uncompresses into memory, and then unmarshals from there (
compressed block for compressed block)

> If there is a link that covers this info, that'd be great too.

See the description of the marshal module.

HTH,
Martin


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 17:09:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 20:09:20 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
Message-ID: <op.uo7gzdcqx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 16:32:41 -0200, <mark.seagoe at gmail.com> escribi?:
> On Feb 11, 9:01?am, mark.sea... at gmail.com wrote:
>> On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
>> wrote:
>> > En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>>
>> > > I like the ability to access elements of a struct such as with > >  
>> ctypes
>> > > Structure:
>> > > What I don't like about it is that it's not iterable:
>> > > I don't want to force the end user to have preknowledge of the > >  
>> element
>> > > names.

[recipe using _fields_]

>> Thanks very much, Gabriel. ?This is very good start for me.
>> This works for predefined class. ?How about a situation where the
>> fields are added dynamically (as from reading in from an xml file).
> I tinkered with it and think I have viable solution.
> I need to append a new member to _fields_ before writing it,
> then it seems to work.
>
>>>> p._fields_.append(('z', c_int))
>>>> point.z = 30
>>>> print 'List:', list(p)
> List: [10, 20, 30]

Yes, that's the way to add a new field -- but you have to do that before
creating the first instance. Anywy, this is somewhat strange for a ctypes
Structure. Usually its memory layout is fixed and mandated by the
library/format/whatever you're trying to bind to.
You are not using it as a generic attribute container, are you? There are
better alternatives in that case.

-- 
Gabriel Genellina



From jeffgemail at gmail.com  Wed Feb 11 17:10:50 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 14:10:50 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
Message-ID: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>

On Feb 11, 3:57?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Having issue on Windows cmd.
> >> Python.exe
> >>>> a = u'\xf0'
> >>>> print a
>
> > This gives a unicode error.
>
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
>
> > Character should look like this "?".
>
> > Please help!
>
> Well, your terminal just cannot display this character by default; you
> need to use a different terminal program, or reconfigure your terminal.
>
> For example, do
>
> chcp 1252
>
> and select Lucida Console as the terminal font, then try again.
>
> Of course, this will cause *different* characters to become
> non-displayable.
>
> Regards,
> Martin

Thanks, I ended up using encode('iso-8859-15', "replace")
Perhaps more up to date than cp1252...??

It still didn't print correctly, but it did write correctly, which was
my main problem.


From robince at gmail.com  Wed Feb 11 17:19:45 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 14:19:45 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <93a73522-66d6-4276-aa5c-4dc913de6adb@13g2000yql.googlegroups.com>

On Feb 11, 7:59?pm, Graham Dumpleton <Graham.Dumple... at gmail.com>
wrote:
> On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > I am building some computational web services using soaplib. This
> > creates a WSGI application.
>
> > However, since some of these services are computationally intensive,
> > and may be long running, I was looking for a way to use multiple
> > processes. I thought about using multiprocessing.Process manually in
> > the service, but I was a bit worried about how that might interact
> > with a threaded server (I was hoping the thread serving that request
> > could just wait until the child is finished). Also it would be good to
> > keep the services as simple as possible so it's easier for people to
> > write them.
>
> > I have at the moment the following WSGI structure:
> > TransLogger(URLMap(URLParser(soaplib objects)))
> > although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> > As I've found with all web-related Python stuff, I'm overwhelmed by
> > the choice and number of alternatives. I've so far been using cherrypy
> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > What would be the simplest [quickest to setup and fewest details of
> > the server required - ideally with a simple example] and most reliable
> > [this will eventually be 'in production' as part of a large scientific
> > project] way to host this sort of WSGI with a process-per-request
> > style?
>
> In this sort of situation one wouldn't normally do the work in the
> main web server, but have a separarte long running daemon process
> embedding mini web server that understands XML-RPC. The main web
> server would then make XML-RPC requests against the backend daemon
> process, which would use threading and or queueing to handle the
> requests.
>
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
>
> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> are really appropriate as you don't want this done in web server
> processes as then you are at mercy of web server processes being
> killed or dying when part way through something. Some of these systems
> will do this if requests take too long. Thus better to offload real
> work to another process.

Thanks - in this case I am contrained to use SOAP (I am providing SOAP
services using soaplib so they run as a WSGI app). I choose soaplib
becuase it seems the simplest way to get soap services running in
Python (I was hoping to get this setup quickly).
So I am not really able to get into anything more complex as you
suggest... I have my nice easy WSGI app soap service, I would just
like it to run in a process pool to avoid GIL. Turns out I can do that
with apache+mod_wsgi and daemon mode, or flup forked server (I would
probably use ajp - so flup is in a seperate process to apache and
listens on some local port, and apache proxies to that using the ajp
protocol). I'm not sure which one is best... for now I'm continuing to
just develop on cherrypy on my own machine.

I suspect I will use ajp forked flup, since that only requires
mod_proxy and mod_proxy_ajp which I understand come with standard
apache and the system administrators will probably be happier with.

Cheers

Robin


From ntwrkd at gmail.com  Wed Feb 11 17:20:36 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 14:20:36 -0800
Subject: getopt index out of range
In-Reply-To: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
References: <mailman.9249.1234293397.3487.python-list@python.org>
	<3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902111420n39859cb3ke23e0f3680362edc@mail.gmail.com>

Perhaps you can give me a call privately and I will explain it to you.
Regards,
Matthew

On Wed, Feb 11, 2009 at 1:48 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 6:16 am, Matthew Sacks <ntw... at gmail.com> wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>
> As you have been told, it is blowing up on index 0. That is because
> optlist is empty (in this case). optlist can contain anything from 0
> items to as many as your user cares to type in. It is NOT limited to
> the number of different options specified in the getopt call; consider
> the case where the arg string is "--action add --action del". Further,
> the contents of optlist are presented in the order they are typed in
> by the user.
>
> Consequently any attempt to give meaningful names to option values
> using constant subscripting of optlist is prima facie an utter
> nonsense.
>
> It is a mind-bogglingly astonishing utter nonsense given the lengthy
> conversation about getopt that we had in another thread yesterday.
> What on earth are you doing???
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From robince at gmail.com  Wed Feb 11 17:22:17 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 14:22:17 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com> 
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com> 
	<mailman.9358.1234387962.3487.python-list@python.org>
Message-ID: <5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>

On Feb 11, 9:32?pm, Graham Dumpleton <graham.dumple... at gmail.com>
wrote:
> 2009/2/12 alex goretoy <aleksandr.gore... at gmail.com>:
>
> > GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
> > managing a server and all it's services this way as well. Just manage dns
> > entries. Although, there are limitations depending on your project needs of
> > what libs you need to use.
>
> GAE is not suitable as they kill off any requests that take more than
> a set time. That time isn't that long, so can't support long running
> requests.

GAE is definitely not suitable in this case... The servers are
provided and maintained as part of a large scientific project for
which I am providing just a few services... Other groups are running
services in other platforms on tomcat through soaplab/instantsoap -
but I was hoping to use native python services since I thought it
would be easier.

Cheers

Robin


From ntwrkd at gmail.com  Wed Feb 11 17:27:13 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 14:27:13 -0800
Subject: getopt index out of range
In-Reply-To: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
References: <mailman.9249.1234293397.3487.python-list@python.org>
	<3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902111427l2d6ccb35y3ffc4e8e1a84b28f@mail.gmail.com>

Keep your threadiquette to yourself.

On Wed, Feb 11, 2009 at 1:48 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 6:16 am, Matthew Sacks <ntw... at gmail.com> wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>
> As you have been told, it is blowing up on index 0. That is because
> optlist is empty (in this case). optlist can contain anything from 0
> items to as many as your user cares to type in. It is NOT limited to
> the number of different options specified in the getopt call; consider
> the case where the arg string is "--action add --action del". Further,
> the contents of optlist are presented in the order they are typed in
> by the user.
>
> Consequently any attempt to give meaningful names to option values
> using constant subscripting of optlist is prima facie an utter
> nonsense.
>
> It is a mind-bogglingly astonishing utter nonsense given the lengthy
> conversation about getopt that we had in another thread yesterday.
> What on earth are you doing???
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gnewsg at gmail.com  Wed Feb 11 17:28:18 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Wed, 11 Feb 2009 14:28:18 -0800 (PST)
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
Message-ID: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>

On Feb 10, 8:38?pm, Richard Gruet <"rgruet at free dot fr"> wrote:
> The Python 2.6 Quick Reference is available in HTML and PDF formats athttp://rgruet.free.fr/#QuickRef.
>
> This time I was helped by Josh Stone for the update.
>
> As usual, your feedback is welcome (pqr at rgruet.net).
>
> Cheers,
>
> Richard Gruet

Thanks a lot. PQR is one of the most useful Python related document on
Internet, IMHO.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From benjamin.kaplan at case.edu  Wed Feb 11 17:35:57 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 17:35:57 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
Message-ID: <ec96e1390902111435o3facffe9nb7bd135520088549@mail.gmail.com>

On Wed, Feb 11, 2009 at 5:10 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 3:57 pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > > Having issue on Windows cmd.
> > >> Python.exe
> > >>>> a = u'\xf0'
> > >>>> print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > Well, your terminal just cannot display this character by default; you
> > need to use a different terminal program, or reconfigure your terminal.
> >
> > For example, do
> >
> > chcp 1252
> >
> > and select Lucida Console as the terminal font, then try again.
> >
> > Of course, this will cause *different* characters to become
> > non-displayable.
> >
> > Regards,
> > Martin
>
> Thanks, I ended up using encode('iso-8859-15', "replace")
> Perhaps more up to date than cp1252...??



> It still didn't print correctly, but it did write correctly, which was
> my main problem.


Let me guess, it showed up as *?**. *This is the cp437 symbol at 0xf0.

When Python sends the string to stdout, it doesn't send characters, it sends
a stream of bytes. It is up to the file or file-like object at the other end
(in this case, cmd.exe) to interpret those bytes. Both cp1252 and
ISO-8859-15 interpret the byte /xf0 as ?. When you opened the text file, it
probbly opened as cp1252 because that's the Windows default. If you change
the terminal encoding, it will display correctly for the same reason.




> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aleksandr.goretoy at gmail.com  Wed Feb 11 17:39:30 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Wed, 11 Feb 2009 16:39:30 -0600
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
	<mailman.9358.1234387962.3487.python-list@python.org>
	<5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>
Message-ID: <fa98a9e30902111439l55d47ff5wbe913038c63ece6b@mail.gmail.com>

>
>
> GAE is definitely not suitable in this case... The servers are
>> provided and maintained as part of a large scientific project for
>> which I am providing just a few services... Other groups are running
>> services in other platforms on tomcat through soaplab/instantsoap -
>> but I was hoping to use native python services since I thought it
>> would be easier.
>>
>
OK, that's cool. I understand about project requirements. It was just a
suggestion. Nonetheless I'm still interested in what people have to say in
this thread.
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From Graham.Dumpleton at gmail.com  Wed Feb 11 17:55:11 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 11 Feb 2009 14:55:11 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com> 
	<93a73522-66d6-4276-aa5c-4dc913de6adb@13g2000yql.googlegroups.com>
Message-ID: <e35fdf9c-6def-4988-b67c-da186366b90c@t39g2000prh.googlegroups.com>

On Feb 12, 9:19?am, Robin <robi... at gmail.com> wrote:
> On Feb 11, 7:59?pm, Graham Dumpleton <Graham.Dumple... at gmail.com>
> wrote:
>
>
>
> > On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
>
> > > Hi,
>
> > > I am building some computational web services using soaplib. This
> > > creates a WSGI application.
>
> > > However, since some of these services are computationally intensive,
> > > and may be long running, I was looking for a way to use multiple
> > > processes. I thought about using multiprocessing.Process manually in
> > > the service, but I was a bit worried about how that might interact
> > > with a threaded server (I was hoping the thread serving that request
> > > could just wait until the child is finished). Also it would be good to
> > > keep the services as simple as possible so it's easier for people to
> > > write them.
>
> > > I have at the moment the following WSGI structure:
> > > TransLogger(URLMap(URLParser(soaplib objects)))
> > > although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> > > As I've found with all web-related Python stuff, I'm overwhelmed by
> > > the choice and number of alternatives. I've so far been using cherrypy
> > > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > > What would be the simplest [quickest to setup and fewest details of
> > > the server required - ideally with a simple example] and most reliable
> > > [this will eventually be 'in production' as part of a large scientific
> > > project] way to host this sort of WSGI with a process-per-request
> > > style?
>
> > In this sort of situation one wouldn't normally do the work in the
> > main web server, but have a separarte long running daemon process
> > embedding mini web server that understands XML-RPC. The main web
> > server would then make XML-RPC requests against the backend daemon
> > process, which would use threading and or queueing to handle the
> > requests.
>
> > If the work is indeed long running, the backend process would normally
> > just acknowledge the request and not wait. The web page would return
> > and it would be up to user to then somehow occassionally poll web
> > server, manually or by AJAX, to see how progres is going. That is,
> > further XML-RPC requests from main server to backend daemon process
> > asking about progress.
>
> > I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> > are really appropriate as you don't want this done in web server
> > processes as then you are at mercy of web server processes being
> > killed or dying when part way through something. Some of these systems
> > will do this if requests take too long. Thus better to offload real
> > work to another process.
>
> Thanks - in this case I am contrained to use SOAP (I am providing SOAP
> services using soaplib so they run as a WSGI app). I choose soaplib
> becuase it seems the simplest way to get soap services running in
> Python (I was hoping to get this setup quickly).
> So I am not really able to get into anything more complex as you
> suggest... I have my nice easy WSGI app soap service, I would just
> like it to run in a process pool to avoid GIL.

You can still use SOAP, you don't have to use XML-RPC, they are after
all just an interprocess communications mechanism.

> Turns out I can do that
> with apache+mod_wsgi and daemon mode, or flup forked server (I would
> probably use ajp - so flup is in a seperate process to apache and
> listens on some local port, and apache proxies to that using the ajp
> protocol). I'm not sure which one is best... for now I'm continuing to
> just develop on cherrypy on my own machine.

In mod_wsgi daemon mode the application is still in a distinct
process. The only dfference is that Apache is acting as the process
supervisor and you do not have to install a separate system such as
supervisord or monit to start up the process and ensure it is
restarted if it crashes, as Apache/mod_wsgi will do that for you. You
also don't need flup when using mod_wsgi as it provides everything.

> I suspect I will use ajp forked flup, since that only requires
> mod_proxy and mod_proxy_ajp which I understand come with standard
> apache and the system administrators will probably be happier with.

The Apache/mod_wsgi approach actually has less dependencies. For it
you only need Apache+mod_wsgi. For AJP you need Apache+flup+monit-or-
supervisord. Just depends on which dependencies you think are easier
to configure and manage. :-)

Graham


From antoinedg at gmail.com  Wed Feb 11 18:00:22 2009
From: antoinedg at gmail.com (Antoine De Groote)
Date: Thu, 12 Feb 2009 00:00:22 +0100
Subject: Clearing the keyboard buffer (wxPython)
In-Reply-To: <gmvdve$c32$03$1@news.t-online.com>
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
	<gmvdve$c32$03$1@news.t-online.com>
Message-ID: <26bd3$49935887$5449a757$28903@news.hispeed.ch>

yes, the server seems to have been down :-(

MarcusD wrote:
> Whow. Thanks for the fast and comprehensive answer. To be honest I would 
> have posted to wxpython.org but the server seems to be down for the last 
> couple of days.
> 
> I'll check this wx.Yield thing that I never heard of. And let's see what 
> else we get here.
> Thanks again
> marcus 
> 
> 


From daniel.watrous at gmail.com  Wed Feb 11 18:01:01 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Wed, 11 Feb 2009 15:01:01 -0800 (PST)
Subject: where is handle_timeout in SocketServer
Message-ID: <4db93841-0fe9-4e3e-b90d-8e0f9cc986c4@m40g2000yqh.googlegroups.com>

I've just been reading the docs to help me with a SocketServer issue.
I found in the docs (http://docs.python.org/library/socketserver.html)
a reference to a member attribute timeout and a member function
handle_timeout() is made.  I am using python 2.5 and there's no
indication that these were added in 2.6 or later.  I've also searched
Google and found that it may have been committed as long ago as
January of last year (http://mail.python.org/pipermail/python-checkins/
2008-January/064877.html).

Why isn't it available in my version of python?  Is there another
place to find it?  Please help me figure out what I'm missing so that
I can use the timeout functionality in my SocketServers.

Thanks.


From rpolanco at estudiantes.uci.cu  Wed Feb 11 18:09:36 2009
From: rpolanco at estudiantes.uci.cu (Rosell Pupo Polanco)
Date: Wed, 11 Feb 2009 15:09:36 -0800
Subject: how many databases exists?
Message-ID: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>

hello, i am working in pythoncard and i need to know how many databases exist in my server POstgresql, exists some funcion in python that can help me??

greettings..Rosell



.::[ La vida es rica en saberes, pero la vida es breve y no se vive, si no se sabe. ]::.
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From cosmo_general at yahoo.com  Wed Feb 11 18:17:24 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Wed, 11 Feb 2009 15:17:24 -0800 (PST)
Subject: Can I 'LOOK' through urllib?
Message-ID: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>

Hi Folks,

I feel good after played urllib with fun!

Now I want to LOOK to server through urllib. I read the urllib docs,
but I did not find such a function. For example, if there are many
files located in http://www.somedomain.com/data_folder, but I don't
know what the filenames are residing in the data_folder. I wish urllib
would have a function to let me do it, as well as I do 'dir' in DOS,
'ls' on unix/linux. Somebody write me a demo? Thanks!


Muddy Coder


From daniel.watrous at gmail.com  Wed Feb 11 18:21:13 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Wed, 11 Feb 2009 15:21:13 -0800 (PST)
Subject: where is handle_timeout in SocketServer
References: <4db93841-0fe9-4e3e-b90d-8e0f9cc986c4@m40g2000yqh.googlegroups.com>
Message-ID: <05d92dff-0eae-40e9-b456-53f4f73aa507@m42g2000yqb.googlegroups.com>

On Feb 11, 4:01?pm, Daniel <daniel.watr... at gmail.com> wrote:
> I've just been reading the docs to help me with a SocketServer issue.
> I found in the docs (http://docs.python.org/library/socketserver.html)
> a reference to a member attribute timeout and a member function
> handle_timeout() is made. ?I am using python 2.5 and there's no
> indication that these were added in 2.6 or later. ?I've also searched
> Google and found that it may have been committed as long ago as
> January of last year (http://mail.python.org/pipermail/python-checkins/
> 2008-January/064877.html).
>
> Why isn't it available in my version of python? ?Is there another
> place to find it? ?Please help me figure out what I'm missing so that
> I can use the timeout functionality in my SocketServers.
>
> Thanks.

I've just looked at the subversion repository and it does appear that
the timeout functionality was introduced in python 2.6 (or after 2.5.2
anyway).
http://svn.python.org/projects/python/trunk/Lib/SocketServer.py
http://svn.python.org/projects/python/tags/r252/Lib/SocketServer.py

I guess I'll see what I can do to adapt since porting my entire
project isn't realistic at this point.


From notvalid2 at sbcglobal.net  Wed Feb 11 18:28:44 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 15:28:44 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
	<5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
Message-ID: <daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>

Mike Driscoll wrote:
> On Feb 11, 3:27 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> Steve Holden wrote:
>>>>> W. eWatson wrote:
>>>>>> My program in IDLE bombed with:
>>>>>> ==============
>>>>>> Exception in Tkinter callback
>>>>>> Traceback (most recent call last):
>>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>>     return self.func(*args)
>>>>>>   File
>>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>>> line 552, in OperationalSettings
>>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>>   File
>>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>>> line 81, in __init__
>>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>>> ===============
>>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>>> just execute the code (double click on the py file, the console shows no
>>>>>> problems. IDLE is unhappy.
>>>>>> Another side to this is that I use WinMerge to find differences between
>>>>>> my last saved copy and the current copy. I found the current copy had
>>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>>> had no trouble executing the program. My guess is that while briefly
>>>>>> editing there, I hit some odd combination of keys that produced,
>>>>>> perhaps, an invisible character that pyWin ignores.
>>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>>> that destroys the dialog.
>>>>> Well you have to remember that you are trying to run a windowed GUI
>>>>> under the control of another windows GUI, so it isn't surprising that
>>>>> you hit trouble.
>>>>> With IDLE the issue will be that IDLE already created a main window
>>>>> before your program started running. With PythonWin you are using two
>>>>> different toolkits, so it isn't really surprising that breaks down -
>>>>> there will be two entirely separate main loops competing with each other.
>>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>>> The two separate loops being PyWin (which uses MFC) and your program
>>> (which uses Tkinter). You just can't mix GUIs in the same process like
>>> that, sorry.
>>> regards
>>>  Stedve
>> I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and
>> pyWin are being run together.
>>
>> Assume neither is running.
>> a. run IDLE, and execute program
>> b. close IDLE script, and interactive window. Kill py program
>> result: boom
>> c. run pyWin and execute program
>> d. do same as b for pyWin
>> resulst: all OK
>> e. repeat a and b.
>> Result: boom
>>
>> Repeat the above and you get the same results.
>>
>> I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above.
>> I switched to it to see if it work there. It did. I double clicked on the py
>> file, and it worked fine. Can you explain this?
>>
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> What Steve (and I) are saying is that IDLE has it's own mainloop and
> your program has a mainloop too as it sounds like it is running a
> Tkinter app. Sometimes when you run a Tk app from another Tk app, the
> two mainloops clash and have weird issue like this one.
> 
> If you just double-click it or run it from the command line, you only
> have one mainloop (i.e. the one that's part of your app). Thus, no
> conflicts.
> 
> Mike
So, how do I get rid of it? reboot?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From martin at v.loewis.de  Wed Feb 11 18:30:07 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Thu, 12 Feb 2009 00:30:07 +0100
Subject: Unicode issue on Windows cmd line
In-Reply-To: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
Message-ID: <49935F7F.5070508@v.loewis.de>

> Thanks, I ended up using encode('iso-8859-15', "replace")
> Perhaps more up to date than cp1252...??
> 
> It still didn't print correctly, but it did write correctly, which was
> my main problem.

If you encode as iso-8859-15, but this is not what your terminal
expects, it certainly won't print correctly. To get correct printing,
the output encoding must be the same as the terminal encoding. If the
terminal encoding is not up to date (as you consider cp1252), then
the output encoding should not be up to date, either.

If you want a modern encoding that supports all of Unicode, and you
don't care whether the output is legible, use UTF-8.

Regards,
Martin


From clp2 at rebertia.com  Wed Feb 11 18:30:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 11 Feb 2009 15:30:53 -0800
Subject: Can I 'LOOK' through urllib?
In-Reply-To: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <50697b2c0902111530x5d3c827fy5731d6a100aa0529@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:17 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I feel good after played urllib with fun!
>
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

No such functionality exists in raw HTTP (i.e. there's no LIST verb
like there is a GET verb), so it's not like Python is erroneously
leaving something out.
You either need cooperation from the server (i.e. it exposes some URL
that gives you `ls`-like output) or the filenames and/or directory
structure need to have some guessable pattern to them so that you can
just run thru the possibilities manually.
So, what you're asking for is impossible in the general case.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From http  Wed Feb 11 18:35:07 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 15:35:07 -0800
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <7xy6wca6ok.fsf@ruckus.brouhaha.com>

Muddy Coder <cosmo_general at yahoo.com> writes:
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

That is done on the server side, and only if the server operator wants
to let you look at the filenames (which is not always).  See for example:

  http://httpd.apache.org/docs/2.2/mod/mod_autoindex.html


From rhodri at wildebst.demon.co.uk  Wed Feb 11 18:53:33 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 11 Feb 2009 23:53:33 -0000
Subject: re.sub and named groups
In-Reply-To: <bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>
Message-ID: <op.uo7onjf7a8ncjz@gnudebst>

On Wed, 11 Feb 2009 21:05:53 -0000, Paul McGuire <ptmcg at austin.rr.com>  
wrote:

> On Feb 4, 10:51?am, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>> Hi everybody,
>>
>> I'm having a ball with the power of regular expression
>
> Don't forget the ball you can have with the power of ordinary Python
> strings, string methods, and string interpolation!

So the moral of this story is take a ball of strings with you for
when you get lost in regular expressions.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From lists at cheimes.de  Wed Feb 11 18:57:00 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 00:57:00 +0100
Subject: Can I 'LOOK' through urllib?
In-Reply-To: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <gmvokc$mbm$1@ger.gmane.org>

Muddy Coder schrieb:
> Hi Folks,
> 
> I feel good after played urllib with fun!
> 
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

The WebDAV [1] extension to the HTTP protocol supports the desired
feature. Are you able to teach your webserver WebDAV by any chance? All
major HTTP server have plugins for WebDAV.

Christian

[1] http://en.wikipedia.org/wiki/Webdav



From grante at visi.com  Wed Feb 11 19:28:56 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 11 Feb 2009 18:28:56 -0600
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <w_ydnU7Zq7rV8A7UnZ2dnUVZ_srinZ2d@posted.usinternet>

On 2009-02-11, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I feel good after played urllib with fun!
>
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder.

Try a GET on http://www.somedomain.com/.  If the admin has
indexing enabled, you should get something like "ls" output.

If not, you're out of luck.

> I wish urllib would have a function to let me do it, as well
> as I do 'dir' in DOS, 'ls' on unix/linux.

I wish I was 20 years younger and ten times as rich as I am.

> Somebody write me a demo?

Somebody send me a time machine and a pile of cash?

On second thought, don't bother with the cash -- with a time
machine, I can generate my own pile of cash.

-- 
Grant



From grante at visi.com  Wed Feb 11 19:34:03 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 11 Feb 2009 18:34:03 -0600
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
	<w_ydnU7Zq7rV8A7UnZ2dnUVZ_srinZ2d@posted.usinternet>
Message-ID: <w_ydnUjZq7rm8w7UnZ2dnUVZ_srinZ2d@posted.usinternet>

On 2009-02-12, Grant Edwards <grante at visi.com> wrote:
> On 2009-02-11, Muddy Coder <cosmo_general at yahoo.com> wrote:
>> Hi Folks,
>>
>> I feel good after played urllib with fun!
>>
>> Now I want to LOOK to server through urllib. I read the urllib docs,
>> but I did not find such a function. For example, if there are many
>> files located in http://www.somedomain.com/data_folder, but I don't
>> know what the filenames are residing in the data_folder.
>
> Try a GET on http://www.somedomain.com/.  If the admin has

Oops.  Should have been GET on http://www.somedomain.com/data_folder/

-- 
Grant



From darwin at nowhere.com  Wed Feb 11 19:44:14 2009
From: darwin at nowhere.com (Carbon Man)
Date: Thu, 12 Feb 2009 11:44:14 +1100
Subject: Embed a web browser into a page
Message-ID: <gmvrd4$1njp$1@news.ett.com.ua>

Hi,
I need to embed a web browser into a python page. I am coming from the MS 
world where I created an app that all of it's interfaces were actually web 
pages rendered in an Internet Explorer activex control. There was a object 
hook that allowed you to call into the host environment from javascript. 
Basically the host environment would receive the documentComplete event and 
call a method in the document's Javascript passing in an object reference. 
That reference would then be available for calls to be made from Javascript 
back into the host environment.
I am just starting to explore the Pythonic programming jungle and I was 
wondering if there is a way to do something similar that would work 
cross-platform?
I guess there is much more complexity in it when you start to go across o/s 
platform boundaries. The common web interface would then be Gecko or WebKit?
So can someone suggest what would be required to build a cross-platform 
Python app that was capable of browsing HTML files, receiving events from 
the browser, and that allows the embedded page to call host Python modules 
from Javascript via an object reference? Or I am asking too much :) 




From markus.schreyer at gmail.com  Wed Feb 11 19:49:48 2009
From: markus.schreyer at gmail.com (Markus Schreyer)
Date: Thu, 12 Feb 2009 01:49:48 +0100
Subject: ANN: Python 2.6 Quick Reference available
In-Reply-To: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
Message-ID: <dc20438f0902111649h748c3db1ya68916916f37f85b@mail.gmail.com>

Great stuff!
Waiting for the 3.0 version.. :)
-------------- next part --------------
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From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 11 19:53:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 00:53:22 GMT
Subject: urllib2.Request:: http Request sending successfully, but Response 
	contains in valid data.
References: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
Message-ID: <pan.2009.02.12.00.53.24@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 01:56:19 -0800, nRk wrote:

> Hi
> 
> I am trying to send Data to a website through "http" using
> "urllib.request" library using the bellow code. Response status code
> contains. 200 (OK) but Response contains nothing...

No it doesn't, you say so later: it contains a set of bare <HTML></HTML> 
tags. That's not the same as nothing.

> 
> With same data When I test using C# it working fine.. Response having..
> some data in xml format.
> But I am using below python code i am getting response only "<HTML></
> HTML>".
> 
> Is there any in my code..
> 
>  req  = urllib2.Request(url) // url is valid url

This is not your real code.

>>> import urllib2
>>> req  = urllib2.Request(url) // url is valid url
  File "<stdin>", line 1
    req  = urllib2.Request(url) // url is valid url
                                                  ^
SyntaxError: invalid syntax


How do you expect us to find bugs in your code when you don't show us 
your real code? Are we supposed to be mind-readers?


Try using the same user-agent string as your C# code uses, and see if the 
server changes what it sends.



-- 
Steven


From python at bdurham.com  Wed Feb 11 19:54:18 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 11 Feb 2009 19:54:18 -0500
Subject: ANN: Python 2.6 Quick Reference available
In-Reply-To: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
Message-ID: <1234400058.4012.1299898597@webmail.messagingengine.com>

Richard,

An excellent tool. Great job!!!

Thank you for sharing this with the Python community.

Regards,
Malcolm


From dan at puddle.net.au  Wed Feb 11 19:57:20 2009
From: dan at puddle.net.au (Dan McKenzie)
Date: Thu, 12 Feb 2009 10:57:20 +1000
Subject: SQL error
Message-ID: <41D70633-6A08-41E2-B385-A1ED7B781B4F@puddle.net.au>

Hi Guys,

I am trying to move data from a file into our mysql database.

The format of the text file is - ipaddress ipaddress bytes packets  
interface-in interface-out eg: 192.168.1.1 192.168.1.2 1522 12 * rob

The sql table is 'ipflows'

This is the code:
____________________________________________________________

#!/usr/bin/python

host    = 'localhost'
user    = 'username'
passwd  = 'password'
dbname  = 'databasename'

import MySQLdb

conn = MySQLdb.connect(host =   host,
                       user =   user,
                       passwd = passwd,
                       db =     dbname)

cursor = conn.cursor()

file = open ('ipflow.txt',"r")

for line in file:
  data = line.split()
  if not line: break
  query = '''INSERT INTO ipflows (to,from,bytes,packets) VALUES  
("%s","%s","%s","%s","%s","%s"))''' %  
(data[0],data[1],data[2],data[3],data[4],data[5])
  cursor.execute(query)
file.close()

cursor.close()
conn.commit()
conn.close()
__________________________________________________________


It is returning and error:

Traceback (most recent call last):
  File "./process_ipflow.py", line 23, in <module>
    cursor.execute(query)
  File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line  
166, in execute
    self.errorhandler(self, exc, value)
  File "/var/lib/python-support/python2.5/MySQLdb/connections.py",  
line 35, in defaulterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.ProgrammingError: (1064, 'You have an error in your  
SQL syntax; check the manual that corresponds to your MySQL server  
version for the right syntax to use near \'to,from,bytes,packets)  
VALUES ("192.168.1.1","192.168.1.2","1522","12","*","\' at line 1')

Seems I have the sql syntax wrong but I can't seem to find the answer :(

Any help would be appreciated.

Regards,

Dan





Regards,

Dan McKenzie
Puddlenet
Community Broadband Networks
Brisbane, Australia Q4074
+61 (0) 407 622 557
+61 (0) 7 3376 8539







From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 11 19:57:34 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 00:57:34 GMT
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
	<ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>
	<71e3e031-de35-4f7b-91e9-1c14436d36f1@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.12.00.57.35@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 12:57:31 -0800, bearophileHUGS wrote:

> Jason:
>> It's such a minor optimization, that you probably wouldn't see any
>> effect on your program.
> 
>>>> from dis import dis
>>>> def f():
> ...  return 'This is ' + 'an example.' ...
>>>> dis(f)
>   2           0 LOAD_CONST               3 ('This is an example.')
>               3 RETURN_VALUE


That's a feature of the CPython keyhole optimizer, not a language 
feature. I expect that if you try that same thing in various other 
Pythons (and earlier versions of CPython) you'll get a different result. 
And like all optimizations, it's not a language feature, it's subject to 
removal without notice if necessary.

If you want guaranteed implicit concatenation, you need to leave out the 
plus operator. That is a language feature.

And I do call it a feature. I find it useful, and I've never run into any 
bugs caused by it, and if I did, I expect they would show up quickly:

x = "foo", "bar"
y = "foo" "bar"

x is a tuple of length 2, y is a string of length 6. You'll soon notice 
the difference. Since it only effects literals, it should be easy enough 
to find.




-- 
Steven


From jeffgemail at gmail.com  Wed Feb 11 20:11:37 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 17:11:37 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
Message-ID: <0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>

On Feb 11, 6:30?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Thanks, I ended up using encode('iso-8859-15', "replace")
> > Perhaps more up to date than cp1252...??
>
> > It still didn't print correctly, but it did write correctly, which was
> > my main problem.
>
> If you encode as iso-8859-15, but this is not what your terminal
> expects, it certainly won't print correctly. To get correct printing,
> the output encoding must be the same as the terminal encoding. If the
> terminal encoding is not up to date (as you consider cp1252), then
> the output encoding should not be up to date, either.
>
> If you want a modern encoding that supports all of Unicode, and you
> don't care whether the output is legible, use UTF-8.
>
> Regards,
> Martin

I did try UTF-8 but it produced the upper case character instead of
the proper lower case, so the output was incorrect for the unicode
supplied.
I think both 8859-15 and cp1252 produced the correct output, but I
figured 8859-15 would have additional character support (though not
sure this is the case - if it is not, please let me know and I'll use
1252).  I'm dealing with large data sets and this just happend to be
one small example.  I want to have the best ability to write future
unicode characters properly based on running from the windows command
line (unless there is a better way to do it on windows).


From sjmachin at lexicon.net  Wed Feb 11 20:16:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 17:16:33 -0800 (PST)
Subject: SQL error
References: <mailman.9372.1234400254.3487.python-list@python.org>
Message-ID: <4a601628-a598-4766-a3e2-68d7bb5a3003@a39g2000prl.googlegroups.com>

On Feb 12, 11:57?am, Dan McKenzie <d... at puddle.net.au> wrote:
> Hi Guys,
>
> I am trying to move data from a file into our mysql database.
>
> The format of the text file is - ipaddress ipaddress bytes packets ?
> interface-in interface-out eg: 192.168.1.1 192.168.1.2 1522 12 * rob
>
> The sql table is 'ipflows'
>
> This is the code:
> ____________________________________________________________
>
> #!/usr/bin/python
>
> host ? ?= 'localhost'
> user ? ?= 'username'
> passwd ?= 'password'
> dbname ?= 'databasename'
>
> import MySQLdb
>
> conn = MySQLdb.connect(host = ? host,
> ? ? ? ? ? ? ? ? ? ? ? ?user = ? user,
> ? ? ? ? ? ? ? ? ? ? ? ?passwd = passwd,
> ? ? ? ? ? ? ? ? ? ? ? ?db = ? ? dbname)
>
> cursor = conn.cursor()
>
> file = open ('ipflow.txt',"r")
>
> for line in file:
> ? data = line.split()
> ? if not line: break

The above line of code is redundant; it can't happen; "line" will
never be "false".

> ? query = '''INSERT INTO ipflows (to,from,bytes,packets) VALUES ?
> ("%s","%s","%s","%s","%s","%s"))''' % ?

You have 6 values but only 4 column names ... looks a bit suss to me.

> (data[0],data[1],data[2],data[3],data[4],data[5])

Ummm .. why not just
   data
instead of
   (data[0],data[1],data[2],data[3],data[4],data[5])
?

> ? cursor.execute(query)
> file.close()
>
> cursor.close()
> conn.commit()
> conn.close()
> __________________________________________________________
>
> It is returning and error:
>
> Traceback (most recent call last):
> ? File "./process_ipflow.py", line 23, in <module>
> ? ? cursor.execute(query)
> ? File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line ?
> 166, in execute
> ? ? self.errorhandler(self, exc, value)
> ? File "/var/lib/python-support/python2.5/MySQLdb/connections.py", ?
> line 35, in defaulterrorhandler
> ? ? raise errorclass, errorvalue
> _mysql_exceptions.ProgrammingError: (1064, 'You have an error in your ?
> SQL syntax; check the manual that corresponds to your MySQL server ?
> version for the right syntax to use near \'to,from,bytes,packets)

TO and FROM are reserved words in just about everybody's version of
SQL. And they're not very meaningful either especially when compared
with interface_in and interface_out.

BUT I'm surprised [not being familiar with MySQL] that you were
allowed to do a CREATE TABLE with those column names.
 ?
> VALUES ("192.168.1.1","192.168.1.2","1522","12","*","\' at line 1')
>
> Dan McKenzie
> Puddlenet

whose mascot no doubt is a duck named Jemima :-)

> Community Broadband Networks
> Brisbane, Australia Q4074

Greetings from Melbourne.

Cheers,
John


From basilisk96 at gmail.com  Wed Feb 11 20:22:26 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Wed, 11 Feb 2009 17:22:26 -0800 (PST)
Subject: how can this iterator be optimized?
Message-ID: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>

Hello all,

I have the following function that uses an intermediate iterator
"rawPairs":

def MakePairs(path):
    import os
    import operator
    join = os.path.join
    rawPairs = (
        (join(path, s), func(s))
        for s in os.listdir(path)
        if func(s) is not None and func(s).endswith("some criterion")
    )
    #Use the second item in the pair as the sort criterion
    result = sorted(rawPairs, key=operator.itemgetter(1))
    return result

where "func" is a single-argument function that returns either a
string or None, but is an expensive call.
I am pretty sure that the sorted() construct cannot be improved much
further, but...
...does anyone have ideas on improving the "rawPairs" iterator so that
it calls "func(s)" only once per iteration?  Perhaps a lambda
construct, but I am not sure how to go about it...?

Cheers,
Basilisk96


From mark.seagoe at gmail.com  Wed Feb 11 20:33:23 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 17:33:23 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com> 
	<mailman.9362.1234390165.3487.python-list@python.org>
Message-ID: <5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>



Hi Gabriel;

Not sure what generic attribute container is.  I am reading in from
xml file
all reg names for a chip.  So then I'd be able to use python scripts
to
access the regs.  So eventually this class will get subclassed w/ hw
access
instead of just saving in int.  So I want to call this module
something like
"CHIP" which contains a struct.  I add the "REG" struct objects as I
read
them in from xml file.  The "REG" struct would have info about
address, # of
bits, type (RO, RW, etc).

Thx,
Mark




From gagsl-py2 at yahoo.com.ar  Wed Feb 11 20:38:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 23:38:56 -0200
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <op.uo7ti6bxx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 23:22:26 -0200, Basilisk96 <basilisk96 at gmail.com>  
escribi?:

> def MakePairs(path):
>     import os
>     import operator
>     join = os.path.join
>     rawPairs = (
>         (join(path, s), func(s))
>         for s in os.listdir(path)
>         if func(s) is not None and func(s).endswith("some criterion")
>     )
>     #Use the second item in the pair as the sort criterion
>     result = sorted(rawPairs, key=operator.itemgetter(1))
>     return result
>
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration?  Perhaps a lambda
> construct, but I am not sure how to go about it...?

Don't use a generator then. If you're going to finally return a list (and  
sorted does exactly that), build a list right from the start:

def MakePairs(path):
     join = os.path.join
     result = []
     append = result.append
     for s in os.listdir(path):
         key = func(s)
         if key is not None and key.endswith("some criterion"):
             append((join(path, s), key))
     #Use the second item in the pair as the sort criterion
     result.sort(key=operator.itemgetter(1))
     return result

-- 
Gabriel Genellina



From shandy.b at gmail.com  Wed Feb 11 20:47:00 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 11 Feb 2009 17:47:00 -0800 (PST)
Subject: CPython loading modules into memory
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
	<49934A78.10309@v.loewis.de>
Message-ID: <b86f1f05-6f6a-4589-9ed0-4b68bf1fd3c4@d36g2000prf.googlegroups.com>

On Feb 11, 2:00?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Can someone describe the details of how Python loads modules into
> > memory? ?I assume once the .py file is compiled to .pyc that it is
> > mmap'ed in. ?But that assumption is very naive. ?Maybe it uses an
> > anonymous mapping? ?Maybe it does other special magic? ?This is all
> > very alien to me, so if someone could explain it in terms that a
> > person who never usually worries about memory could understand, that
> > would be much appreciated.
>
> There is no magic whatsoever. Python opens a sequential file descriptor
> for the .pyc file, and then reads it in small chunks, "unmarshalling"
> it (indeed, the marshal module is used to restore Python objects).
>
> The marshal format is an object serialization in a type-value encoding
> (sometimes type-length-value), with type codes for:
> - None, True, False
> - 32-bit ints, 64-bit ints (unmarshalled into int/long)
> - floats, complex
> - arbitrary-sized longs
> - strings, unicode
> - tuples (length + marshal data of values)
> - lists
> - dicts
> - code objects
> - a few others
>
> Result of unmarshalling is typically a code object.
>
> > Follow up: is this process different if the modules are loaded from a
> > zipfile?
>
> No; it uncompresses into memory, and then unmarshals from there (
> compressed block for compressed block)
>
> > If there is a link that covers this info, that'd be great too.
>
> See the description of the marshal module.
>
> HTH,
> Martin


Thanks for the answers.  For my own edification, and in case anyone is
interested, I confirmed this by looking at import.c and marshal.c in
the Python2.5.4 source.  Looks like the actual reading of the file is
done in the marshal.c function PyMarshal_ReadLastObjectFromFile.  It
is read sequentially using a small buffer on the heap.

-sjbrown


From jeffgemail at gmail.com  Wed Feb 11 20:48:55 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 17:48:55 -0800 (PST)
Subject: Another optimization request :-)
Message-ID: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>

If anyone wants to take this on... I would really really like to have
the spring_layout modified to support multi-threading if at all
possible.
My test data is 20,000, which makes this process 20,000 x 20,000 or
400,000,000 (400 million) calculations.  This is taking somewhere
between 2-3 hours an iteration.
I plan to plot out over 1,000,000 data points or more, which would put
this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
making this more efficient would be much appreciated.

def spring_layout(G, iterations=50, dim=2, node_pos=None,
verbose=False):
    """Spring force model layout"""
    if node_pos==None :  # set the initial positions randomly in 1x1
box
        vpos=random_layout(G, dim=dim)
    else:
        vpos=node_pos
    if iterations==0:
        return vpos
    if G.order()==0:
        k=1.0
    else:
        k=N.sqrt(1.0/G.order()) # optimal distance between nodes
    disp={}         # displacements

    # initial "temperature" (about .1 of domain area)
    # this is the largest step allowed in the dynamics
    # linearly step down by dt on each iteration so
    # on last iteration it is size dt.
    t=0.1
    dt=0.1/float(iterations+1)
    for i in range(0,iterations):
        for v in G:
            if verbose==True:
                print("Interation: " + str(i + 1) + ", Calculating: "
+ str(v.encode('iso-8859-15', "replace")))
            disp[v]=N.zeros(dim)
            for u in G:
                delta=vpos[v]-vpos[u]
                dn=max(sqrt(N.dot(delta,delta)),0.01)
                # repulsive force between all
                deltaf=delta*k**2/dn**2
                disp[v]=disp[v]+deltaf
                # attractive force between neighbors
                if G.has_edge(v,u):
                    deltaf=-delta*dn**2/(k*dn)
                    disp[v]=disp[v]+deltaf

        # update positions
        for v in G:
            l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
            vpos[v]=vpos[v]+ disp[v]*t/l
        t-=dt
    return vpos


From bj_666 at gmx.net  Wed Feb 11 20:51:47 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 12 Feb 2009 01:51:47 GMT
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
Message-ID: <6vhdljFju0haU1@mid.uni-berlin.de>

On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:

> Not sure what generic attribute container is.  I am reading in from xml
> file all reg names for a chip.

Are you using instances of that class to interface C code or to read/
write data intended to be read or written by a C program?  If not then 
`ctypes` might be the wrong tool.

Ciao,
	Marc 'BlackJack' Rintsch


From drobinow at gmail.com  Wed Feb 11 20:59:20 2009
From: drobinow at gmail.com (drobinow at gmail.com)
Date: Wed, 11 Feb 2009 17:59:20 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org> 
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
Message-ID: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>

On Feb 11, 2:51?pm, Steve Holden <st... at holdenweb.com> wrote:
> W. eWatson wrote:
> > Steve Holden wrote:
> >> W. eWatson wrote:
> >>> My program in IDLE bombed with:
> >>> ==============
> >>> Exception in Tkinter callback
> >>> Traceback (most recent call last):
> >>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> >>> ? ? return self.func(*args)
> >>> ? File
> >>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>> line 552, in OperationalSettings
> >>> ? ? dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> >>> ? File
> >>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>> line 81, in __init__
> >>> ? ? tkSimpleDialog.Dialog.__init__(self, parent)
> >>> ? File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> >>> ? ? self.wait_visibility() # window needs to be visible for the grab
> >>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> >>> ? ? self.tk.call('tkwait', 'visibility', window._w)
> >>> TclError: window ".34672232" was deleted before its visibility changed
> >>> ===============
> >>> It runs fine in pythonWin performing the same entry operation. Open a
> >>> menu, ?select an item to open a dialog, select a select button in the
> >>> dialog, press OK to leave the dialog. Boom, as above.
>
> >>> (This does not mean pythonWin doesn't have problems of its own. ) If I
> >>> just execute the code (double click on the py file, the console shows no
> >>> problems. IDLE is unhappy.
>
> >>> Another side to this is that I use WinMerge to find differences between
> >>> my last saved copy and the current copy. I found the current copy had
> >>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> >>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> >>> had no trouble executing the program. My guess is that while briefly
> >>> editing there, I hit some odd combination of keys that produced,
> >>> perhaps, an invisible character that pyWin ignores.
>
> >>> Not the 34672232 window is a dialog that I closed by pressing OK. I
> >>> would again guess, that, if there is a problem, it occurs in the code
> >>> that destroys the dialog.
>
> >> Well you have to remember that you are trying to run a windowed GUI
> >> under the control of another windows GUI, so it isn't surprising that
> >> you hit trouble.
>
> >> With IDLE the issue will be that IDLE already created a main window
> >> before your program started running. With PythonWin you are using two
> >> different toolkits, so it isn't really surprising that breaks down -
> >> there will be two entirely separate main loops competing with each other.
>
> > Not quite. I take down IDLE when I run pyWin, and vice versa.
>
> The two separate loops being PyWin (which uses MFC) and your program
> (which uses Tkinter). You just can't mix GUIs in the same process like
> that, sorry.
>
> regards
> ?Stedve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Deja-vu!

http://mail.python.org/pipermail/python-list/2001-March/076069.html


From mark.seagoe at gmail.com  Wed Feb 11 21:02:12 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 18:02:12 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com> 
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
	<6vhdljFju0haU1@mid.uni-berlin.de>
Message-ID: <defd1101-4e47-4fd3-a050-c97bd2015bf3@r36g2000prf.googlegroups.com>

On Feb 11, 5:51?pm, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:
> > Not sure what generic attribute container is. ?I am reading in from xml
> > file all reg names for a chip.
>
> Are you using instances of that class to interface C code or to read/
> write data intended to be read or written by a C program? ?If not then
> `ctypes` might be the wrong tool.
>
> Ciao,
> ? ? ? ? Marc 'BlackJack' Rintsch

It's accessing through USB so I'm also interfacing to Win32 drivers.
But at this higher level, since I'm somewhat new to Python so I'm not
aware of other classes which exist to allow accessing in the format
desired (without quotes and using dot notation):
classname.elementname1, instead of something like classname
["elementname1"].  It's just cosmetic, but I'd prefer the dot notation
without quotes for the end user experience of script writing later.
Is there something besides ctypes.Structure that would do that?

Thx,
Mark


From andrew at acooke.org  Wed Feb 11 21:44:10 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 23:44:10 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>


why are you dong this point by point?  surely you can express the physics
as a set of equations and invert the matrix?  wouldn't that be a lot
faster?  you'd replace the iteration over all combinations of points with
a faster matrix inversion.

see for example
http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdf page 331
onwards.

there's a very nice into to the verlet integration mentioned here -
http://teknikus.dk/tj/gdc2001.htm

andrew


jeffg wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.
> My test data is 20,000, which makes this process 20,000 x 20,000 or
> 400,000,000 (400 million) calculations.  This is taking somewhere
> between 2-3 hours an iteration.
> I plan to plot out over 1,000,000 data points or more, which would put
> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
> making this more efficient would be much appreciated.
>
> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> verbose=False):
>     """Spring force model layout"""
>     if node_pos==None :  # set the initial positions randomly in 1x1
> box
>         vpos=random_layout(G, dim=dim)
>     else:
>         vpos=node_pos
>     if iterations==0:
>         return vpos
>     if G.order()==0:
>         k=1.0
>     else:
>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>     disp={}         # displacements
>
>     # initial "temperature" (about .1 of domain area)
>     # this is the largest step allowed in the dynamics
>     # linearly step down by dt on each iteration so
>     # on last iteration it is size dt.
>     t=0.1
>     dt=0.1/float(iterations+1)
>     for i in range(0,iterations):
>         for v in G:
>             if verbose==True:
>                 print("Interation: " + str(i + 1) + ", Calculating: "
> + str(v.encode('iso-8859-15', "replace")))
>             disp[v]=N.zeros(dim)
>             for u in G:
>                 delta=vpos[v]-vpos[u]
>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>                 # repulsive force between all
>                 deltaf=delta*k**2/dn**2
>                 disp[v]=disp[v]+deltaf
>                 # attractive force between neighbors
>                 if G.has_edge(v,u):
>                     deltaf=-delta*dn**2/(k*dn)
>                     disp[v]=disp[v]+deltaf
>
>         # update positions
>         for v in G:
>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>             vpos[v]=vpos[v]+ disp[v]*t/l
>         t-=dt
>     return vpos
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From david.birdsong at gmail.com  Wed Feb 11 21:44:53 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 18:44:53 -0800 (PST)
Subject: select.poll.poll() never blocks
Message-ID: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>

I'm pretty sure I've exhausted all searches and read all the forums
Google will turn up related to this issue.

I touch an empty file in a sh shell, fire up the python shell, open
the file for reading(tried all buffering options), register it with a
poll object for select.POLLIN and call poll(), but the poll never
blocks and always returns for the FD, EVENT combination I ask for, but
the file has not anything written to it.

Here's an example snippet:
>>> fd = os.open('/tmp/poll_test', os.O_RDONLY | os.O_SYNC)
>>> p = select.poll()
>>> p.register(fd, select.POLLIN)
>>> s = p.poll()
>>> os.read(fd, 10)
''
>>> s
[(3, 1)]
>>> fd
3

I was using the open builtin originally, but a forum I read suggested
that this created user level buffers that the system call wouldn't
know about(which didn't completely jive with me), so I switched to the
lower level os.open.

Am I not getting the proper spirit of select.poll?  I know that read()
never blocks and I think I read somewhere that poll will return fd
that will not block for the EVENT registered -so in that regard it's
fitting.

Any help on what I'm missing would be appreciated.


From exarkun at divmod.com  Wed Feb 11 21:49:09 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 11 Feb 2009 21:49:09 -0500
Subject: select.poll.poll() never blocks
In-Reply-To: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
Message-ID: <20090212024909.12853.309763852.divmod.quotient.9093@henry.divmod.com>

On Wed, 11 Feb 2009 18:44:53 -0800 (PST), birdsong <david.birdsong at gmail.com> wrote:
>I'm pretty sure I've exhausted all searches and read all the forums
>Google will turn up related to this issue.
>
>I touch an empty file in a sh shell, fire up the python shell, open
>the file for reading(tried all buffering options), register it with a
>poll object for select.POLLIN and call poll(), but the poll never
>blocks and always returns for the FD, EVENT combination I ask for, but
>the file has not anything written to it.

Filesystem files are always reported as readable and writeable by select,
poll, epoll, etc.

If you want to do non-blocking filesystem I/O, your choices are to use a
native thread (Python's threading module, or another third-party module
which wraps the platform thread API) or to use POSIX AIO (or the mildly
incompatible Linux variant.  Of course, AIO has tons of caveats and is
generally in a miserable state, so you probably shouldn't use it.  That
leaves you with threads.

Jean-Paul


From andrew at acooke.org  Wed Feb 11 21:56:52 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 23:56:52 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
Message-ID: <0fbde7b4d61078a9c7cda67e0b3bfbbb.squirrel@acooke.dyndns.org>


sorry, that was stupid.  there is no inversion (apart from 1/m), just the
integration.

still, improving the integration would allow larger steps.

andrew



andrew cooke wrote:
>
> why are you dong this point by point?  surely you can express the physics
> as a set of equations and invert the matrix?  wouldn't that be a lot
> faster?  you'd replace the iteration over all combinations of points with
> a faster matrix inversion.
>
> see for example
> http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdf page 331
> onwards.
>
> there's a very nice into to the verlet integration mentioned here -
> http://teknikus.dk/tj/gdc2001.htm
>
> andrew
>
>
> jeffg wrote:
>> If anyone wants to take this on... I would really really like to have
>> the spring_layout modified to support multi-threading if at all
>> possible.
>> My test data is 20,000, which makes this process 20,000 x 20,000 or
>> 400,000,000 (400 million) calculations.  This is taking somewhere
>> between 2-3 hours an iteration.
>> I plan to plot out over 1,000,000 data points or more, which would put
>> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
>> making this more efficient would be much appreciated.
>>
>> def spring_layout(G, iterations=50, dim=2, node_pos=None,
>> verbose=False):
>>     """Spring force model layout"""
>>     if node_pos==None :  # set the initial positions randomly in 1x1
>> box
>>         vpos=random_layout(G, dim=dim)
>>     else:
>>         vpos=node_pos
>>     if iterations==0:
>>         return vpos
>>     if G.order()==0:
>>         k=1.0
>>     else:
>>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>>     disp={}         # displacements
>>
>>     # initial "temperature" (about .1 of domain area)
>>     # this is the largest step allowed in the dynamics
>>     # linearly step down by dt on each iteration so
>>     # on last iteration it is size dt.
>>     t=0.1
>>     dt=0.1/float(iterations+1)
>>     for i in range(0,iterations):
>>         for v in G:
>>             if verbose==True:
>>                 print("Interation: " + str(i + 1) + ", Calculating: "
>> + str(v.encode('iso-8859-15', "replace")))
>>             disp[v]=N.zeros(dim)
>>             for u in G:
>>                 delta=vpos[v]-vpos[u]
>>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>>                 # repulsive force between all
>>                 deltaf=delta*k**2/dn**2
>>                 disp[v]=disp[v]+deltaf
>>                 # attractive force between neighbors
>>                 if G.has_edge(v,u):
>>                     deltaf=-delta*dn**2/(k*dn)
>>                     disp[v]=disp[v]+deltaf
>>
>>         # update positions
>>         for v in G:
>>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>>             vpos[v]=vpos[v]+ disp[v]*t/l
>>         t-=dt
>>     return vpos
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From gagsl-py2 at yahoo.com.ar  Wed Feb 11 22:00:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 12 Feb 2009 01:00:45 -0200
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
	<0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>
Message-ID: <op.uo7xbjjhx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 23:11:37 -0200, jeffg <jeffgemail at gmail.com> escribi?:
> On Feb 11, 6:30?pm, "Martin v. L?wis" <mar.. at v.loewis.de> wrote:

>> > Thanks, I ended up using encode('iso-8859-15', "replace")
>> > Perhaps more up to date than cp1252...??
>> If you encode as iso-8859-15, but this is not what your terminal
>> expects, it certainly won't print correctly. To get correct printing,
>> the output encoding must be the same as the terminal encoding. If the
>> terminal encoding is not up to date (as you consider cp1252), then
>> the output encoding should not be up to date, either.
> I did try UTF-8 but it produced the upper case character instead of
> the proper lower case, so the output was incorrect for the unicode
> supplied.
> I think both 8859-15 and cp1252 produced the correct output, but I
> figured 8859-15 would have additional character support (though not
> sure this is the case - if it is not, please let me know and I'll use
> 1252).  I'm dealing with large data sets and this just happend to be
> one small example.  I want to have the best ability to write future
> unicode characters properly based on running from the windows command
> line (unless there is a better way to do it on windows).

As Martin v. L?wis already said, the encoding used by Python when writing  
to the console, must match the encoding the console expects. (And you also  
should use a font capable of displaying such characters).

windows-1252 and iso-8859-15 are similar, but not identical. This table  
shows the differences (less than 30 printable characters):  
http://en.wikipedia.org/wiki/Western_Latin_character_sets_(computing)
If your script encodes its output using iso-8859-15, the corresponding  
console code page should be 28605.
"Western European" (whatever that means exactly) Windows versions use the  
windows-1252 encoding as the "Ansi code page" (GUI applications), and  
cp850 as the "OEM code page" (console applications) -- cp437 in the US  
only.

C:\Documents and Settings\Gabriel>chcp 1252
Tabla de c?digos activa: 1252

C:\Documents and Settings\Gabriel>python
Python 2.6 (r26:66721, Oct  2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)]  
on win
32
Type "help", "copyright", "credits" or "license" for more information.
py> unichr(0x0153).encode("windows-1252")
'\x9c'
py> print _
?
py> ^Z

C:\Documents and Settings\Gabriel>chcp 28605
Tabla de c?digos activa: 28605

C:\Documents and Settings\Gabriel>python
Python 2.6 (r26:66721, Oct  2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)]  
on win
32
Type "help", "copyright", "credits" or "license" for more information.
py> unichr(0x0153).encode("iso-8859-15")
'\xbd'
py> print _
?
py> unichr(0x0153).encode("latin9")
'\xbd'

-- 
Gabriel Genellina



From david.birdsong at gmail.com  Wed Feb 11 22:01:16 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 19:01:16 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <mailman.9375.1234406953.3487.python-list@python.org>
Message-ID: <e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>

So I guess I didn't have a complete understanding of poll, I thought
it returned file descriptors that had registered an event that the
user asked to watch for.  In my case, select.POLLIN
Constant 	Meaning
POLLIN 	There is data to read

...there ins't any data to be read.  The file is readable, yes, but is
that all that the syscall has to offer?


On Feb 11, 6:49?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Wed, 11 Feb 2009 18:44:53 -0800 (PST), birdsong <david.birds... at gmail.com> wrote:
> >I'm pretty sure I've exhausted all searches and read all the forums
> >Google will turn up related to this issue.
>
> >I touch an empty file in a sh shell, fire up the python shell, open
> >the file for reading(tried all buffering options), register it with a
> >poll object for select.POLLIN and call poll(), but the poll never
> >blocks and always returns for the FD, EVENT combination I ask for, but
> >the file has not anything written to it.
>
> Filesystem files are always reported as readable and writeable by select,
> poll, epoll, etc.
>
> If you want to do non-blocking filesystem I/O, your choices are to use a
> native thread (Python's threading module, or another third-party module
> which wraps the platform thread API) or to use POSIX AIO (or the mildly
> incompatible Linux variant. ?Of course, AIO has tons of caveats and is
> generally in a miserable state, so you probably shouldn't use it. ?That
> leaves you with threads.
>
> Jean-Paul



From scott.bronson.nelson at gmail.com  Wed Feb 11 22:02:22 2009
From: scott.bronson.nelson at gmail.com (scott.bronson.nelson at gmail.com)
Date: Wed, 11 Feb 2009 19:02:22 -0800 (PST)
Subject: __import__ Confusion
Message-ID: <5e61a9a8-7caa-4dfc-9454-aa8eddb8e593@z1g2000yqn.googlegroups.com>

Can someone explain to me what's going on here?

>>> __import__('some.package.module', {}, {}, [])
<module 'some' from 'some/__init__.py'>
>>> __import__('some.package.module', {}, {}, [''])
<module 'some.package.module' from 'some/package/module.py'>

(Note that '' is two single quotes)

Thanks,
Scott


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 22:17:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 12 Feb 2009 01:17:37 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
	<6vhdljFju0haU1@mid.uni-berlin.de>
	<defd1101-4e47-4fd3-a050-c97bd2015bf3@r36g2000prf.googlegroups.com>
Message-ID: <op.uo7x3ns8x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 00:02:12 -0200, <mark.seagoe at gmail.com> escribi?:
> On Feb 11, 5:51?pm, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
>> On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:

>> > Not sure what generic attribute container is. ?I am reading in from >  
>> xml file all reg names for a chip.
>>
>> Are you using instances of that class to interface C code or to read/
>> write data intended to be read or written by a C program? ?If not then
>> `ctypes` might be the wrong tool.
>
> It's accessing through USB so I'm also interfacing to Win32 drivers.
> But at this higher level, since I'm somewhat new to Python so I'm not
> aware of other classes which exist to allow accessing in the format
> desired (without quotes and using dot notation):
> classname.elementname1, instead of something like classname
> ["elementname1"].  It's just cosmetic, but I'd prefer the dot notation
> without quotes for the end user experience of script writing later.
> Is there something besides ctypes.Structure that would do that?

You don't need *anything* special to add attributes to an object in  
Python. Even an empty class is enough:

py> class Struct(object):
...   pass # an empty class
...
py> s = Struct()
py> s.x = 10
py> s.y = 20
py> print s.x, s.y
10 20
py>

But since this thread started asking how to iterate over the attributes,  
let's use a named tuple:

py> from collections import namedtuple
py> StructWithNames = namedtuple("StructWithNames", "x,y,z")
py> s = StructWithNames(10, 20, 30)
py> s.z
30
py> s
StructWithNames(x=10, y=20, z=30)
py> list(s)
[10, 20, 30]
py> for item in s: print item
...
10
20
30
py> s._fields
('x', 'y', 'z')

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Wed Feb 11 22:47:46 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 12 Feb 2009 03:47:46 -0000
Subject: select.poll.poll() never blocks
In-Reply-To: <e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
References: <mailman.9375.1234406953.3487.python-list@python.org>
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
Message-ID: <op.uo7zhwfqa8ncjz@gnudebst>

On Thu, 12 Feb 2009 03:01:16 -0000, birdsong <david.birdsong at gmail.com>  
wrote:

> So I guess I didn't have a complete understanding of poll, I thought
> it returned file descriptors that had registered an event that the
> user asked to watch for.  In my case, select.POLLIN
> Constant 	Meaning
> POLLIN 	There is data to read
>
> ...there ins't any data to be read.  The file is readable, yes, but is
> that all that the syscall has to offer?

To quote the web page referenced in help(select):

"It cannot be used on regular files to determine whether a file has grown  
since it was last read."

poll() and friends are wrappers over the socket library "poll" and
"select" functions, which primarily exist to facilitate asynchronous
socket communications.  They can take ordinary file descriptors as
well as sockets because there's no good reason not to, but a regular
file will always be ready to read as long as you haven't read past
the end of file.

You're trying to use a regular file as if it was a pipe.  My first
obvious question is do you have to do it this way?  Do you have
any control over the program writing to file?  Can you cause the
output to go to stdout and pipe it into your script's stdin
instead?  That would make your life vastly easier.

If you can't, I'm not sure what your best strategy is.  I'd
be tempted to use "tail -f filetocheck | yourscript.py" and
palm the job off on an already-written tool.  If you want to
do it in Python, the only thing that springs to mind is
periodically checking the size of the file and reading more
when that changes.  You'll need to be very careful to keep
what size you think the file is in sync with how much you've
read!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From semanticist at gmail.com  Wed Feb 11 22:51:33 2009
From: semanticist at gmail.com (Miles)
Date: Wed, 11 Feb 2009 22:51:33 -0500
Subject: select.poll.poll() never blocks
In-Reply-To: <op.uo7zhwfqa8ncjz@gnudebst>
References: <mailman.9375.1234406953.3487.python-list@python.org>
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
	<op.uo7zhwfqa8ncjz@gnudebst>
Message-ID: <a49e45f50902111951v49c91f42i6679fbd0bfd6e82d@mail.gmail.com>

On Wed, Feb 11, 2009 at 10:47 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> If you want to
> do it in Python, the only thing that springs to mind is
> periodically checking the size of the file and reading more
> when that changes.  You'll need to be very careful to keep
> what size you think the file is in sync with how much you've
> read!

See also this recipe:
http://code.activestate.com/recipes/157035/

-Miles


From notvalid2 at sbcglobal.net  Wed Feb 11 22:57:55 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:57:55 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <49939E43.6090205@sbcglobal.net>

drobinow at gmail.com wrote:
> On Feb 11, 2:51 pm, Steve Holden <st... at holdenweb.com> wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> My program in IDLE bombed with:
>>>>> ==============
>>>>> Exception in Tkinter callback
>>>>> Traceback (most recent call last):
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>     return self.func(*args)
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 552, in OperationalSettings
>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 81, in __init__
>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>> ===============
>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>> just execute the code (double click on the py file, the console shows no
>>>>> problems. IDLE is unhappy.
>>>>> Another side to this is that I use WinMerge to find differences between
>>>>> my last saved copy and the current copy. I found the current copy had
>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>> had no trouble executing the program. My guess is that while briefly
>>>>> editing there, I hit some odd combination of keys that produced,
>>>>> perhaps, an invisible character that pyWin ignores.
>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>> that destroys the dialog.
>>>> Well you have to remember that you are trying to run a windowed GUI
>>>> under the control of another windows GUI, so it isn't surprising that
>>>> you hit trouble.
>>>> With IDLE the issue will be that IDLE already created a main window
>>>> before your program started running. With PythonWin you are using two
>>>> different toolkits, so it isn't really surprising that breaks down -
>>>> there will be two entirely separate main loops competing with each other.
>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 22:58:22 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:58:22 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <49939E5E.2000309@sbcglobal.net>

drobinow at gmail.com wrote:
> On Feb 11, 2:51 pm, Steve Holden <st... at holdenweb.com> wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> My program in IDLE bombed with:
>>>>> ==============
>>>>> Exception in Tkinter callback
>>>>> Traceback (most recent call last):
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>     return self.func(*args)
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 552, in OperationalSettings
>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 81, in __init__
>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>> ===============
>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>> just execute the code (double click on the py file, the console shows no
>>>>> problems. IDLE is unhappy.
>>>>> Another side to this is that I use WinMerge to find differences between
>>>>> my last saved copy and the current copy. I found the current copy had
>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>> had no trouble executing the program. My guess is that while briefly
>>>>> editing there, I hit some odd combination of keys that produced,
>>>>> perhaps, an invisible character that pyWin ignores.
>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>> that destroys the dialog.
>>>> Well you have to remember that you are trying to run a windowed GUI
>>>> under the control of another windows GUI, so it isn't surprising that
>>>> you hit trouble.
>>>> With IDLE the issue will be that IDLE already created a main window
>>>> before your program started running. With PythonWin you are using two
>>>> different toolkits, so it isn't really surprising that breaks down -
>>>> there will be two entirely separate main loops competing with each other.
>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 22:58:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:58:56 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>


>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 23:00:34 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 20:00:34 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
	<5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
	<daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>
Message-ID: <39Nkl.22667$ZP4.17550@nlpi067.nbdc.sbc.com>

> So, how do I get rid of it? reboot?

Just to re-iterate the I provided the question to above, I'm using Tkinter 
for the program's GUI.


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 23:04:09 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 20:04:09 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
	<x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
Message-ID: <pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>

It looks like I got an accidentally case of send message 3 times. Well, 
here's a correct below.
> The question now is what can I do about it? reboot?
> 
> Just to re-iterate the answer I provided to *>the question to a post above<*, I'm using 
> Tkinter for the program's GUI.
> 


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jeffgemail at gmail.com  Wed Feb 11 23:16:09 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 20:16:09 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
	<0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>
	<mailman.9377.1234407654.3487.python-list@python.org>
Message-ID: <56bb1488-91c7-434f-ab57-c9c52be80d5b@j35g2000yqh.googlegroups.com>

On Feb 11, 10:00?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 11 Feb 2009 23:11:37 -0200, jeffg <jeffgem... at gmail.com> escribi?:
>
>
>
> > On Feb 11, 6:30?pm, "Martin v. L?wis" <ma... at v.loewis.de> wrote:
> >> > Thanks, I ended up using encode('iso-8859-15', "replace")
> >> > Perhaps more up to date than cp1252...??
> >> If you encode as iso-8859-15, but this is not what your terminal
> >> expects, it certainly won't print correctly. To get correct printing,
> >> the output encoding must be the same as the terminal encoding. If the
> >> terminal encoding is not up to date (as you consider cp1252), then
> >> the output encoding should not be up to date, either.
> > I did try UTF-8 but it produced the upper case character instead of
> > the proper lower case, so the output was incorrect for the unicode
> > supplied.
> > I think both 8859-15 and cp1252 produced the correct output, but I
> > figured 8859-15 would have additional character support (though not
> > sure this is the case - if it is not, please let me know and I'll use
> > 1252). ?I'm dealing with large data sets and this just happend to be
> > one small example. ?I want to have the best ability to write future
> > unicode characters properly based on running from the windows command
> > line (unless there is a better way to do it on windows).
>
> As Martin v. L?wis already said, the encoding used by Python when writing ?
> to the console, must match the encoding the console expects. (And you also ?
> should use a font capable of displaying such characters).
>
> windows-1252 and iso-8859-15 are similar, but not identical. This table ?
> shows the differences (less than 30 printable characters): ?http://en.wikipedia.org/wiki/Western_Latin_character_sets_(computing)
> If your script encodes its output using iso-8859-15, the corresponding ?
> console code page should be 28605.
> "Western European" (whatever that means exactly) Windows versions use the ?
> windows-1252 encoding as the "Ansi code page" (GUI applications), and ?
> cp850 as the "OEM code page" (console applications) -- cp437 in the US ?
> only.
>
> C:\Documents and Settings\Gabriel>chcp 1252
> Tabla de c?digos activa: 1252
>
> C:\Documents and Settings\Gabriel>python
> Python 2.6 (r26:66721, Oct ?2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] ?
> on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
> py> unichr(0x0153).encode("windows-1252")
> '\x9c'
> py> print _
> ?
> py> ^Z
>
> C:\Documents and Settings\Gabriel>chcp 28605
> Tabla de c?digos activa: 28605
>
> C:\Documents and Settings\Gabriel>python
> Python 2.6 (r26:66721, Oct ?2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] ?
> on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
> py> unichr(0x0153).encode("iso-8859-15")
> '\xbd'
> py> print _
> ?
> py> unichr(0x0153).encode("latin9")
> '\xbd'
>
> --
> Gabriel Genellina

Thanks, switched it to windows-1252.


From jeffgemail at gmail.com  Wed Feb 11 23:19:53 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 20:19:53 -0800 (PST)
Subject: Another optimization request :-)
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org> 
	<mailman.9376.1234407426.3487.python-list@python.org>
Message-ID: <cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>

On Feb 11, 9:56?pm, "andrew cooke" <and... at acooke.org> wrote:
> sorry, that was stupid. ?there is no inversion (apart from 1/m), just the
> integration.
>
> still, improving the integration would allow larger steps.
>
> andrew
>
> andrew cooke wrote:
>
> > why are you dong this point by point? ?surely you can express the physics
> > as a set of equations and invert the matrix? ?wouldn't that be a lot
> > faster? ?you'd replace the iteration over all combinations of points with
> > a faster matrix inversion.
>
> > see for example
> >http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdfpage 331
> > onwards.
>
> > there's a very nice into to the verlet integration mentioned here -
> >http://teknikus.dk/tj/gdc2001.htm
>
> > andrew
>
> > jeffg wrote:
> >> If anyone wants to take this on... I would really really like to have
> >> the spring_layout modified to support multi-threading if at all
> >> possible.
> >> My test data is 20,000, which makes this process 20,000 x 20,000 or
> >> 400,000,000 (400 million) calculations. ?This is taking somewhere
> >> between 2-3 hours an iteration.
> >> I plan to plot out over 1,000,000 data points or more, which would put
> >> this at 1,000,000,000,000 (1 trillion) calculations. ?Any help in
> >> making this more efficient would be much appreciated.
>
> >> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> >> verbose=False):
> >> ? ? """Spring force model layout"""
> >> ? ? if node_pos==None : ?# set the initial positions randomly in 1x1
> >> box
> >> ? ? ? ? vpos=random_layout(G, dim=dim)
> >> ? ? else:
> >> ? ? ? ? vpos=node_pos
> >> ? ? if iterations==0:
> >> ? ? ? ? return vpos
> >> ? ? if G.order()==0:
> >> ? ? ? ? k=1.0
> >> ? ? else:
> >> ? ? ? ? k=N.sqrt(1.0/G.order()) # optimal distance between nodes
> >> ? ? disp={} ? ? ? ? # displacements
>
> >> ? ? # initial "temperature" (about .1 of domain area)
> >> ? ? # this is the largest step allowed in the dynamics
> >> ? ? # linearly step down by dt on each iteration so
> >> ? ? # on last iteration it is size dt.
> >> ? ? t=0.1
> >> ? ? dt=0.1/float(iterations+1)
> >> ? ? for i in range(0,iterations):
> >> ? ? ? ? for v in G:
> >> ? ? ? ? ? ? if verbose==True:
> >> ? ? ? ? ? ? ? ? print("Interation: " + str(i + 1) + ", Calculating: "
> >> + str(v.encode('iso-8859-15', "replace")))
> >> ? ? ? ? ? ? disp[v]=N.zeros(dim)
> >> ? ? ? ? ? ? for u in G:
> >> ? ? ? ? ? ? ? ? delta=vpos[v]-vpos[u]
> >> ? ? ? ? ? ? ? ? dn=max(sqrt(N.dot(delta,delta)),0.01)
> >> ? ? ? ? ? ? ? ? # repulsive force between all
> >> ? ? ? ? ? ? ? ? deltaf=delta*k**2/dn**2
> >> ? ? ? ? ? ? ? ? disp[v]=disp[v]+deltaf
> >> ? ? ? ? ? ? ? ? # attractive force between neighbors
> >> ? ? ? ? ? ? ? ? if G.has_edge(v,u):
> >> ? ? ? ? ? ? ? ? ? ? deltaf=-delta*dn**2/(k*dn)
> >> ? ? ? ? ? ? ? ? ? ? disp[v]=disp[v]+deltaf
>
> >> ? ? ? ? # update positions
> >> ? ? ? ? for v in G:
> >> ? ? ? ? ? ? l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
> >> ? ? ? ? ? ? vpos[v]=vpos[v]+ disp[v]*t/l
> >> ? ? ? ? t-=dt
> >> ? ? return vpos
> >> --
> >>http://mail.python.org/mailman/listinfo/python-list
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>

To be honest, this is not my code and I'm new to python.  It's part of
the open source project NetworkX, but I'm using this one call
extensively.  I'm also not that familiar with the math behind the
physics.  I'll read the documents and see if I can figure it
out.  :-)  Thank you for the links and suggestions.  I really need to
get this code performing at peak levels.


From basilisk96 at gmail.com  Wed Feb 11 23:26:12 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Wed, 11 Feb 2009 20:26:12 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
Message-ID: <cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>

> Don't use a generator then. If you're going to finally return a list (and ?
> sorted does exactly that), build a list right from the start:

Good point. However, for the sake of argument, what if I removed the
sorting requirement and simply wanted the generator? I usually strive
for comprehensions if a for loop can be reduced to such.  Would there
be any speed advantage in this case of a comprehension-style generator
vs. a for-yield loop (assuming there is a way to call func(s) once per
iteration in the comprehension)?  In my example, func() operates on
filename strings, so it's not too bad.. but it's possible for this
pattern to apply to more substantial operations.  My conjecture is
that higher func() loads would favor more the use of a simple for-
yield loop.

Cheers,
Basilisk96


From jonathan.chacon at telefonica.net  Wed Feb 11 23:58:05 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 05:58:05 +0100
Subject: TTS in windows
Message-ID: <119422E84F8C43C8A5E693A09DAEC260@HPVista>

Hello,

I need to use SAPI5 text to speech with python but I don't find anything
that lets me manage speech, tone, volume, etc


Does anybody know anything to do this?

Thanks and regards
	Jonathan Chac?n



From elgrandchignon at gmail.com  Wed Feb 11 23:58:28 2009
From: elgrandchignon at gmail.com (Jason)
Date: Wed, 11 Feb 2009 20:58:28 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
Message-ID: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>

Hey everyone--

I'm pretty new to Python, & I need to do something that's incredibly
simple, but combing my Python Cookbook & googling hasn't helped me out
too much yet, and my brain is very, very tired & flaccid @ the
moment....

I have a list of objects, simply called "list".  I need to break it
into an array (list of lists) wherein each sublist is the length of
the variable "items_per_page".  So array[0] would go from array[0][0]
to array[0][items_per_page], then bump up to array[1][0] - array[1]
[items_per_page], until all the items in the original list were
accounted for.

What would be the simplest way to do this in Python?  And yes, I
realize I should probably be taking Programming 101.....


From jonathan.chacon at telefonica.net  Thu Feb 12 00:00:36 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 06:00:36 +0100
Subject: Capture images in macOS X
Message-ID: <5732EB03A0054D80976798E0EE7FE3A4@HPVista>

Hello,

I need to capture images from the macbook webcam in leopard.
Does anybody know how can I do this?

Thanks and regards
	Jonathan Chac?n



From argo785 at gmail.com  Thu Feb 12 00:06:06 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Wed, 11 Feb 2009 21:06:06 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
Message-ID: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>

Tonight I needed to draw a series of simple shapes in a window using a
bit of math but didn't have much time to do it. I've got very little
GUI toolkit experience. Briefly had a look at the usually-recommended
heavyweight GUI toolkits, but I didn't want to inherit from widget
classes or override paint methods (not that those things don't have
their place). I just wanted to quickly draw some shapes. Within a few
minutes I had what I needed, and it was by using Tkinter. The code
looked something like this:

~~~~
#!/usr/bin/env python

import Tkinter as tk

root = tk.Tk()

canv = tk.Canvas(root, width=647, height=400, background='white')
canv.pack(side=tk.TOP, fill=tk.BOTH, expand=1)

# drawing happens here ...
canv.create_oval(50, 80, 150, 180)
# ...

root.mainloop()
~~~~

Wow that was *really* easy.

After playing around just a bit more, regular GUI programs are pretty
quick and simple to make as well. My only (minor) complaint is that Tk
doesn't draw text antialiased in the various widgets (menus, labels,
buttons, etc.).

Anyway, thanks Tk and Tkinter!


From mensanator at aol.com  Thu Feb 12 00:41:30 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 11 Feb 2009 21:41:30 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>

On Feb 11, 10:58?pm, Jason <elgrandchig... at gmail.com> wrote:
> Hey everyone--
>
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
>
> I have a list of objects, simply called "list". ?I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page". ?So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
>
> What would be the simplest way to do this in Python? ?And yes, I
> realize I should probably be taking Programming 101.....

>>> items_per_page = 20
>>> x = range(113)
>>> layout = divmod(113,20)
>>> if layout[1]>0:
	pages = layout[0]+1
else:
	pages = layout[0]
>>> array = [ x[i*items_per_page:i*items_per_page+items_per_page]  for i in xrange(pages)]
>>> array
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19], [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
70, 71, 72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86,
87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102,
103, 104, 105, 106, 107, 108, 109, 110, 111, 112]]


From tjreedy at udel.edu  Thu Feb 12 00:41:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:41:39 -0500
Subject: how can this iterator be optimized?
In-Reply-To: <cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
Message-ID: <gn0cqf$p9$1@ger.gmane.org>

Basilisk96 wrote:
>> Don't use a generator then. If you're going to finally return a list (and  
>> sorted does exactly that), build a list right from the start:
> 
> Good point. However, for the sake of argument, what if I removed the
> sorting requirement and simply wanted the generator?

Write a generator function with the same loop and a yield.

? I usually strive
> for comprehensions if a for loop can be reduced to such.

You are overdoing it, I think.  Generator expressions are for saving 
programmer time, not machine time.



From skippy.hammond at gmail.com  Thu Feb 12 00:47:21 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 12 Feb 2009 16:47:21 +1100
Subject: TTS in windows
In-Reply-To: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
References: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
Message-ID: <4993B7E9.2030304@gmail.com>

On 12/02/2009 3:58 PM, Jonathan Chac?n wrote:
> Hello,
>
> I need to use SAPI5 text to speech with python but I don't find anything
> that lets me manage speech, tone, volume, etc
>
>
> Does anybody know anything to do this?

It appears this is doable from COM.  With the pywin32 package:

 >>> import win32com.client
 >>> o=win32com.client.Dispatch("{96749377-3391-11D2-9EE3-00C04F797396}")
 >>> o.Speak("Hello there")
1
 >>> o.Volume
100
 >>> o.Volume=50
 >>> o.Speak("Hello there")
1

Works for me on Vista.  The magic number is the value for CLSID_SpVoice, 
which I found by googling (for some reason, the actual definition of 
that CLSID doesn't appear in the SDK headers...)

HTH,

Mark


From sambit2005 at gmail.com  Thu Feb 12 00:48:26 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Thu, 12 Feb 2009 18:48:26 +1300
Subject: Need an application sends from paricular port
Message-ID: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>

Hi

I am new to Python world

 I need a python script , which binds at a user defind port & sends to other
enity , which waits at particular port.
The other enity will respond & Python script should receive that at the
defined port

The communication will happen over UDP

e.g

*Python Appl*

IP: 10.116.78.90
Port : 3000


*Other Enity* :

IP: 10.116.98.87
Port : 3010


Pyhon Appl ------------>UDP  ----> Other Enity
                  <--------------------------


Please help
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From si.422a at yahoo.com  Thu Feb 12 00:52:49 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Wed, 11 Feb 2009 21:52:49 -0800 (PST)
Subject: explain
Message-ID: <25821.66604.qm@web111201.mail.gq1.yahoo.com>

Hello, I want to use python but I do not know that I install Python or ActivePython or VPython or Jython?
My operating system is Windows XP SP2.
Please explain for me completely.



      
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From tjreedy at udel.edu  Thu Feb 12 00:53:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:53:25 -0500
Subject: Another optimization request :-)
In-Reply-To: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <gn0dgh$23k$1@ger.gmane.org>

jeffg wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.
> My test data is 20,000, which makes this process 20,000 x 20,000 or
> 400,000,000 (400 million) calculations.  This is taking somewhere
> between 2-3 hours an iteration.
> I plan to plot out over 1,000,000 data points or more, which would put
> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
> making this more efficient would be much appreciated.
> 
> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> verbose=False):
>     """Spring force model layout"""
>     if node_pos==None :  # set the initial positions randomly in 1x1
> box
>         vpos=random_layout(G, dim=dim)
>     else:
>         vpos=node_pos
>     if iterations==0:
>         return vpos
>     if G.order()==0:
>         k=1.0
>     else:
>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>     disp={}         # displacements
> 
>     # initial "temperature" (about .1 of domain area)
>     # this is the largest step allowed in the dynamics
>     # linearly step down by dt on each iteration so
>     # on last iteration it is size dt.
>     t=0.1
>     dt=0.1/float(iterations+1)
>     for i in range(0,iterations):
>         for v in G:
>             if verbose==True:
>                 print("Interation: " + str(i + 1) + ", Calculating: "
> + str(v.encode('iso-8859-15', "replace")))
>             disp[v]=N.zeros(dim)
>             for u in G:
>                 delta=vpos[v]-vpos[u]

Let n = len(vpos).  I believe there are only n-1 different deltas, dns, 
and deltafs, where as n**2 calculations are made.

>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>                 # repulsive force between all
>                 deltaf=delta*k**2/dn**2
>                 disp[v]=disp[v]+deltaf
>                 # attractive force between neighbors
>                 if G.has_edge(v,u):
>                     deltaf=-delta*dn**2/(k*dn)
>                     disp[v]=disp[v]+deltaf
> 
>         # update positions
>         for v in G:
>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>             vpos[v]=vpos[v]+ disp[v]*t/l
>         t-=dt
>     return vpos

That aside, array calculations like this should be *much* faster with 
numpy.  Or try compiling (with weave or Cython, for instance).



From tjreedy at udel.edu  Thu Feb 12 00:56:07 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:56:07 -0500
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0dli$23k$2@ger.gmane.org>

Jason wrote:

> I have a list of objects, simply called "list".

Bad idea.

>  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.

Assuming this is not homework, look at itertools module.


> What would be the simplest way to do this in Python?  And yes, I
> realize I should probably be taking Programming 101.....

I guess it is not.



From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 00:56:27 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 05:56:27 GMT
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <pan.2009.02.12.05.56.28@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 20:58:28 -0800, Jason wrote:

> I have a list of objects, simply called "list".  

Generally speaking, that's not a good choice of names, because it over-
writes ("shadows") the built-in function list().


> I need to break it into
> an array (list of lists) wherein each sublist is the length of the
> variable "items_per_page".  So array[0] would go from array[0][0] to
> array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.


This may not be the simplest or most efficient way of doing it, but it 
doesn't involve any advanced techniques other than slicing (which is 
pretty fundamental to Python).


>>> from string import lowercase  # just some random data
>>> list = list(lowercase)
>>> items_per_page = 5
>>> array = []
>>> num_sublists = len(list)//items_per_page
>>> if len(list) % items_per_page != 0:
...     num_sublists += 1
...
>>> for i in range(num_sublists):
...     array.append(list[i*items_per_page:(i+1)*items_per_page])
...
>>>
>>> from pprint import pprint
>>> pprint(array)
[['a', 'b', 'c', 'd', 'e'],
 ['f', 'g', 'h', 'i', 'j'],
 ['k', 'l', 'm', 'n', 'o'],
 ['p', 'q', 'r', 's', 't'],
 ['u', 'v', 'w', 'x', 'y'],
 ['z']]
>>> 


There are other alternatives. Here's a more advanced technique:

>>> ipp = 7  # use a shorter name
>>> m, n = divmod(len(list), ipp)
>>> array = [list[i*ipp:(i+1)*ipp] for i in range(m+bool(n))]
>>> pprint(array)
[['a', 'b', 'c', 'd', 'e', 'f', 'g'],
 ['h', 'i', 'j', 'k', 'l', 'm', 'n'],
 ['o', 'p', 'q', 'r', 's', 't', 'u'],
 ['v', 'w', 'x', 'y', 'z']]




-- 
Steven


From pythonnutter at gmail.com  Thu Feb 12 00:59:46 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 12 Feb 2009 16:59:46 +1100
Subject: Programmatically changing network proxy settings on the Mac
In-Reply-To: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>
References: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>
Message-ID: <af90b3410902112159r4fb02c91r223d21d01e0692a3@mail.gmail.com>

OS X is POSIX/UNIX system so your basic plan of going about things:
1. Learn what proxy/network subsystem Tiger uses
2. Learn what proxy/network subsystem Leopard uses (same as 1., or has
it changed?)
3. Based on 1 and 2 learn the config file names and locations.
4. Based on 3 you will determine if the file is text or xml format so
learn file processing for whichever one
5. Read the config file, Make some changes in OS X, read the config
file and compare changes.
6. Programatically script changes to those config file(s).
7. Learn if any service/daemon needs to be restarted or if an
interface needs to be brought down/up to bring in those changes to the
config file.
8. Script in what you learned in 7.
9. Finished.

2009/2/11  <arunasunil at gmail.com>:
> Hi,
>
> Anybody have suggestions of how network proxy settings can be changed
> programmatically on the Mac, Tiger and Leopard. Are there any helpful
> python api's that can be used.
>
> Thanks
> Sunil
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From david.birdsong at gmail.com  Thu Feb 12 01:09:11 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 22:09:11 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <mailman.9375.1234406953.3487.python-list@python.org> 
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com> 
	<mailman.9379.1234410481.3487.python-list@python.org>
Message-ID: <3e3d6829-cda8-4e34-98ab-617b65caf436@l39g2000yqn.googlegroups.com>

On Feb 11, 7:47?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Thu, 12 Feb 2009 03:01:16 -0000, birdsong <david.birds... at gmail.com> ?
> wrote:
>
> > So I guess I didn't have a complete understanding of poll, I thought
> > it returned file descriptors that had registered an event that the
> > user asked to watch for. ?In my case, select.POLLIN
> > Constant ? Meaning
> > POLLIN ? ? There is data to read
>
> > ...there ins't any data to be read. ?The file is readable, yes, but is
> > that all that the syscall has to offer?
>
> To quote the web page referenced in help(select):
>
> "It cannot be used on regular files to determine whether a file has grown ?
> since it was last read."
>
> poll() and friends are wrappers over the socket library "poll" and
> "select" functions, which primarily exist to facilitate asynchronous
> socket communications. ?They can take ordinary file descriptors as
> well as sockets because there's no good reason not to, but a regular
> file will always be ready to read as long as you haven't read past
> the end of file.
>
> You're trying to use a regular file as if it was a pipe. ?My first
> obvious question is do you have to do it this way? ?Do you have
> any control over the program writing to file? ?Can you cause the
> output to go to stdout and pipe it into your script's stdin
> instead? ?That would make your life vastly easier.
agreed, this was my original idea, but i figured implementing a tail -
f via poll was alot faster to write and implement.  i'm glad at least
know why it wasn't working as expected.

i've already written a tail -f similar to the one found in the link
from a later poster, but i was hoping to use poll to cut down on
unecessary seeks -i'm trying to avoid actions that would drive up
iowait on the boxes this would run on.

thanks for the clarification on the poll family of syscalls.

>
> If you can't, I'm not sure what your best strategy is. ?I'd
> be tempted to use "tail -f filetocheck | yourscript.py" and
> palm the job off on an already-written tool. ?If you want to
> do it in Python, the only thing that springs to mind is
> periodically checking the size of the file and reading more
> when that changes. ?You'll need to be very careful to keep
> what size you think the file is in sync with how much you've
> read!
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses



From ntwrkd at gmail.com  Thu Feb 12 01:09:46 2009
From: ntwrkd at gmail.com (gofkuckyourself)
Date: Wed, 11 Feb 2009 22:09:46 -0800
Subject: explain
In-Reply-To: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
References: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
Message-ID: <f257b9ab0902112209s6d6c29f9i43a482422aa64c8c@mail.gmail.com>

Saeed,
The standard Python distribution is community supported and available
on Windows http://www.python.org/download/windows/
ActivePython is ActiveState's version of Python with extra libraries
and commercial support available
VPython I am not familiar with, perhaps someone else can speak to this
Jython is good if you are used to developing in Java and want to
utlize / embed Python in Java code. It is also good for many other
reasons, but for beginning purposes I would recommend the standard
python distribution.


To get started see http://www.python.org/about/gettingstarted/

Hope this helps.

On Wed, Feb 11, 2009 at 9:52 PM, Saeed Iravani <si.422a at yahoo.com> wrote:
> Hello, I want to use python but I do not know that I install Python or
> ActivePython or VPython or Jython?
> My operating system is Windows XP SP2.
> Please explain for me completely.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From pythonnutter at gmail.com  Thu Feb 12 01:12:41 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 12 Feb 2009 17:12:41 +1100
Subject: explain
In-Reply-To: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
References: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
Message-ID: <af90b3410902112212v41974a6cs9277129df70e03dc@mail.gmail.com>

If your use is to Generically "want to use python on Windows XP" you
install the standard/generic Python that you download from python.org

Without any details to decide with, I would also say download version
2.5.4 of Python from python.org

2009/2/12 Saeed Iravani <si.422a at yahoo.com>:
> Hello, I want to use python but I do not know that I install Python or
> ActivePython or VPython or Jython?
> My operating system is Windows XP SP2.
> Please explain for me completely.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 01:13:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 06:13:38 GMT
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
	<mailman.9320.1234344687.3487.python-list@python.org>
Message-ID: <pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:

>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>> def fact(n):
>>>     if n < 0: raise ValueError
>>>     if n = 0: return 1
>>>     return fact(n-1)*n
>>>
>>> At the risk of premature optimization, I wonder if there is an idiom
>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>> recursive calls?
> 
> Reverse the test order
> 
> def fact(n):
>      if n > 0: return fact(n-1)*n
>      if n == 0: return 1
>      raise ValueError
> 
> You must test recursive versus terminal case every call in any case.
> Nearly always, the first test passes and second is not done. You only
> test n==0 once, either to terminate or raise exception. This works for
> any integral value and catches non-integral values. (There is some delay
> for that, but only bad calls are penalized.)

Nice try, but in fact no.



>>> fact(None)  # works okay
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in fact
ValueError
>>>
>>> fact({})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in fact
TypeError: unsupported operand type(s) for -: 'dict' and 'int'

You're relying on arbitrary ordering of types in Python 2.x, and of 
course in Python 3 that fails altogether.

Thanks for everyone who responded, I now have some food for thought.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 01:15:19 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 06:15:19 GMT
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 20:26:12 -0800, Basilisk96 wrote:

>> Don't use a generator then. If you're going to finally return a list
>> (and sorted does exactly that), build a list right from the start:
> 
> Good point. However, for the sake of argument, what if I removed the
> sorting requirement and simply wanted the generator? 

The same applies. You're problem is that you call an expensive function 
three times instead of once. Some compilers can optimize that away, but 
not in Python, because there's no guarantee that the function will be the 
same function between calls.


> I usually strive
> for comprehensions if a for loop can be reduced to such.

Any particular reason?


> Would there be
> any speed advantage in this case of a comprehension-style generator vs.
> a for-yield loop (assuming there is a way to call func(s) once per
> iteration in the comprehension)?  

I understand that comprehensions are slightly slower. I recently found a 
40% speed up on a trivial generator expression when converted to a for 
loop. Admittedly the gen expr did very little, and I haven't tested list 
comprehensions.



> In my example, func() operates on
> filename strings, so it's not too bad.. but it's possible for this
> pattern to apply to more substantial operations.  My conjecture is that
> higher func() loads would favor more the use of a simple for- yield
> loop.

If there's only one call to func(), and you ignore the (probably) fixed 
cost of jumping into a generator each time, then it shouldn't make any 
difference.

If you are comparing one call to func() in a for loop versus three calls 
to func() in a list comp or generator expression, then of course the for 
loop will be more efficient.


-- 
Steven


From mail at microcorp.co.za  Thu Feb 12 01:18:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 12 Feb 2009 08:18:54 +0200
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
	<gmuo5k$tdt$1@ger.gmane.org>
Message-ID: <00a501c98cd9$c8693620$0d00a8c0@hendrik>

"Steve Holden" <ste....nweb.com> wrote:

> Jeez, doesn't anyone read the fine manual any more? I hope this was just
> an academic exercise.
> 
> >>> socket.inet_ntoa(struct.pack("!l", 1000000000))
> '59.154.202.0'
> >>>
> 
> Holden's rule: when it looks simple enough to be worth including in the
> standard library it may well already *be* in the standard library.

Aaah! But how do you find it, if you don't already know
where it lives and what it's called ?

- Hendrik




From mail at microcorp.co.za  Thu Feb 12 01:36:03 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 12 Feb 2009 08:36:03 +0200
Subject: select.poll.poll() never blocks
References: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
Message-ID: <018901c98cdc$2de44c40$0d00a8c0@hendrik>

"birdsong" <dav..g at gmail.com>wrote:

8<----------- select not blocking on empty file stuff -----------------

> Any help on what I'm missing would be appreciated.

Why do you expect it to block? 
It is ready to read, to return end of file.

- Hendrik




From rt8396 at gmail.com  Thu Feb 12 01:39:24 2009
From: rt8396 at gmail.com (r)
Date: Wed, 11 Feb 2009 22:39:24 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
Message-ID: <766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>

Hello,

Tkinter is a great GUI toolkit, for what it lacks in prettiness it
more than makes up for in simple and quick GUI building. I think this
is the main reason Tkinter continues to be Python's built-in GUI
toolkit. It is a great place to start for those with no GUI
experience. Sure it will never be as rich as wxPython or the like, but
that is not what Tkinter is made for.

I use Tkinter for all my tools that need a UI, and others as well. The
only complaint i have is the poor support for image types i really
wish there where at least support for one good image like jpg, png,
and full color bitmaps.The canvas widget could also use a little more
functionality, but hey maybe one day i will have time to polish it up
a bit.


From metolone+gmane at gmail.com  Thu Feb 12 01:48:57 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Wed, 11 Feb 2009 22:48:57 -0800
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0gof$8lv$1@ger.gmane.org>


"Jason" <elgrandchignon at gmail.com> wrote in message 
news:8158439d-faae-4889-a1cf-8d9fee112e9b at v39g2000yqm.googlegroups.com...
> Hey everyone--
>
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
>
> I have a list of objects, simply called "list".  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
>
> What would be the simplest way to do this in Python?  And yes, I
> realize I should probably be taking Programming 101.....

>>> def splitlist(L,count):
...     M=[]
...     for i in xrange(0,len(L),count):
...         M.append(L[i:i+count])
...     return M
...
>>> L=range(18)
>>> splitlist(L,3)
[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11], [12, 13, 14], [15, 16, 17]]
>>> splitlist(L,4)
[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17]]

-Mark




From timr at probo.com  Thu Feb 12 01:58:32 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 12 Feb 2009 06:58:32 GMT
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
	<7xwsby7mw3.fsf@ruckus.brouhaha.com>
Message-ID: <rmh7p498u3kvik6psr3nt2dlltoorngapp@4ax.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

>In case anyone is interested: Gideon Smeding of the University of
>Utrecht has written a masters' thesis titled "An executable
>operational semantics for Python".

That's an interesting grammatical construct.  I would have said either
"Executable operational semantics for Python," or "An executable
operational semantic for Python."

"A semantics" just doesn't flow.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From david.birdsong at gmail.com  Thu Feb 12 02:14:25 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 23:14:25 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
	<mailman.9392.1234421149.3487.python-list@python.org>
Message-ID: <30014b58-d47a-4930-96a8-9fcd02764d7a@r41g2000yqm.googlegroups.com>

On Feb 11, 10:36?pm, "Hendrik van Rooyen" <m... at microcorp.co.za>
wrote:
> "birdsong" <dav... at gmail.com>wrote:
>
> 8<----------- select not blocking on empty file stuff -----------------
>
> > Any help on what I'm missing would be appreciated.
>
> Why do you expect it to block?
> It is ready to read, to return end of file.
>
I expected it to block because of the name and meaning of the flag,
POLLIN, which I thought meant new data has arrived to be read.  Since
I only registered a single file descriptor, I would have expected poll
to not return until there was new data to be read.  I understand now
that it is not the case.


From jonathan.chacon at telefonica.net  Thu Feb 12 02:38:44 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 08:38:44 +0100
Subject: TTS in windows
In-Reply-To: <4993B7E9.2030304@gmail.com>
References: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
	<4993B7E9.2030304@gmail.com>
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAIAcWNRwqt5NlGfOhdO75b3CgAAAEAAAAEFRWV2vlltHk2d71jCrSqABAAAAAA==@telefonica.net>

 

-----Mensaje original-----
De: Mark Hammond [mailto:skippy.hammond at gmail.com] 
Enviado el: jueves, 12 de febrero de 2009 6:47

>It appears this is doable from COM.  With the pywin32 package:

Well, I have problems to install pywin32 (pywin32-212.win32-py2.5.exe)

I'll try to solve that problem later


Thanks
	Jonathan Chac?n



From xahlee at gmail.com  Thu Feb 12 02:45:47 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 11 Feb 2009 23:45:47 -0800 (PST)
Subject: which language has syntax that visually represent a tree? [was X#]
References: <6toeb5Fbjeu1U1@mid.individual.net>
Message-ID: <258b8081-9265-4c47-b23a-132e0ff696c0@r37g2000prr.googlegroups.com>

syntax that represent a tree purely [was X#]

On Jan 21, 3:13 am, Pascal Costanza <p... at p-cos.net> wrote:
> LOL: http://www.xsharp.org/samples/

Today, i was nosing about some blogs, which made me come to:
http://blog.fogus.me/2009/02/06/yegge-clojure-arc-and-lolita-or-days-of-future-past

in which he wrote: ?Now I?m not a LISP expert, but it seems to me that
the S-Expression is generally regarded as the canonical representation
of the LISP AST (and many other languages for that matter). That is,
the LISP syntax is as close to an AST as one can get. Perhaps the
presence of macros, #, `, ?, and , muddy the waters a bit, but not
much.?

that is technically not true. Although you mentioned lisp syntax
irregularities like ?# , ,@ '?, but in general this sentiment that
lisp has regular syntax, or that its syntax is closest to abstract
syntax tree, is perpetuating a myth.

Mathematica language's syntax, XML, and XML derived general purpose
languages (e.g. O:XML, X#), are in fact more regular and closest to a
pure tree representation of the abstract syntax tree.

For detail, see:

? Fundamental Problems of Lisp
  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
  (the first section; on syntax irregularity)

? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
Nested Notations
  http://xahlee.org/UnixResource_dir/writ/notations.html

also note, nesting matching delimiters is not the only way to
represent a tree. Indentation, such as used in Python or ascii-picture
tree used to represent directories and sub dirs and files, is another
form, arguably has more clarity than nesting with delimiters. As far
as i known, there were a couple such proposal/spec/library with
working implementation of this syntax that works for Scheme lisp.

in general, the question is what are ways to represent a tree
structure visually using text. The lisp, Mathematica approach is
nesting matching pairs. Ascii-picture approch is using lines to
represent a tree node and indentation to represent their level.
(python's syntax borrows this idea, however not in a pure form, in the
sense that the source code's visual representation does not correspond
to python's AST, far from it)

Note here, one of the important aspect here is VISUALLY. Because
otherwise any syntax is abstract syntax tree by definition. This
criterion can be formalized mathematically, by saying that the parser
for such a syntax should be very simple as having just one heuristics
that is based on recursion. (i dont have expertise in parsing, but in
parser jargon, i think there are simple terms to describe this class
of syntax, something like: its lexical grammar can be parsed by
parsing expression grammar)

Another important aspect here is that the source code of lang with
such syntax also needs to remain human readable and practically usable
for programers to type conveniently. This is the reason, lisp has few
irregular syntax introduced. Mathematica, take the approach of a layer
of syntax on top of the regular. This in my opinion has 2 major
advantages: A: the regularity of the syntax is unadulterated. B:
arbitrary shorter, traditional, or algebraic syntax can be introduced.
This is also why, python's syntax isn't a pure representation of its
abstract syntax tree, else, to code ?print 3+4*5? becomes:

 print
  +
   3
   *
    4
    5

As for XML derived languages, the problem of verbosity and nesting
largely remains. The practiced solution seems to head towards a
specialized editor so that programers work on the editor's simpler
representation instead of the source code. (e.g. much of MathML, and
conversely Microsoft Word with its XML file format)

  Xah
? http://xahlee.org/

?


From grflanagan at gmail.com  Thu Feb 12 02:46:47 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Thu, 12 Feb 2009 07:46:47 +0000
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0k57$g51$1@ger.gmane.org>

Jason wrote:
> Hey everyone--
> 
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
> 
> I have a list of objects, simply called "list".  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
> 

If you need to pad the last item:

def chunk( seq, size, pad=None ):
     '''
     Slice a list into consecutive disjoint 'chunks' of
     length equal to size. The last chunk is padded if necessary.

     >>> list(chunk(range(1,10),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
     >>> list(chunk(range(1,9),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, None]]
     >>> list(chunk(range(1,8),3))
     [[1, 2, 3], [4, 5, 6], [7, None, None]]
     >>> list(chunk(range(1,10),1))
     [[1], [2], [3], [4], [5], [6], [7], [8], [9]]
     >>> list(chunk(range(1,10),9))
     [[1, 2, 3, 4, 5, 6, 7, 8, 9]]
     >>> for X in chunk([],3): print X
     >>>
     '''
     n = len(seq)
     mod = n % size
     for i in xrange(0, n-mod, size):
         yield seq[i:i+size]
     if mod:
         padding = [pad] * (size-mod)
         yield seq[-mod:] + padding

If you search the list archive, there is surely an example which will do 
the same for an arbitrary iterable (in general, you can't assume that 
`len(seq)` will work for an iterable that is not a list, set or tuple). 
But if you are just starting with Python, don't worry about this.




From greg at cosc.canterbury.ac.nz  Thu Feb 12 03:30:49 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 12 Feb 2009 21:30:49 +1300
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <4993DE39.8030200@cosc.canterbury.ac.nz>

rantingrick wrote:

> It has long been my dream to create an open source 3D CAD program and
> 
> I have a real good idea of the UI design

Have you seen Sketchup?

    http://sketchup.google.com/

It has an amazingly intuitive user interface, much better
than any other 3D modeller I've seen. Anyone thinking of
designing a 3D app would do well to study it closely, IMO.

Something with a Sketchup-like UI but designed for serious
CAD work would be an incredibly good thing to have.

In any case, your project sounds interesting, and I'll
be happy to discuss ideas if you want.

-- 
Greg


From sjmachin at lexicon.net  Thu Feb 12 03:53:06 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 12 Feb 2009 00:53:06 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
	<mailman.9395.1234424821.3487.python-list@python.org>
Message-ID: <f9e73436-0089-4e99-a215-a077bea730c7@v18g2000pro.googlegroups.com>

On Feb 12, 6:46?pm, Gerard Flanagan <grflana... at gmail.com> wrote:
> Jason wrote:
> > Hey everyone--
>
> > I'm pretty new to Python, & I need to do something that's incredibly
> > simple, but combing my Python Cookbook & googling hasn't helped me out
> > too much yet, and my brain is very, very tired & flaccid @ the
> > moment....
>
> > I have a list of objects, simply called "list". ?I need to break it
> > into an array (list of lists) wherein each sublist is the length of
> > the variable "items_per_page". ?So array[0] would go from array[0][0]
> > to array[0][items_per_page], then bump up to array[1][0] - array[1]
> > [items_per_page], until all the items in the original list were
> > accounted for.
>
> If you need to pad the last item:
>
> def chunk( seq, size, pad=None ):
> ? ? ?'''
> ? ? ?Slice a list into consecutive disjoint 'chunks' of
> ? ? ?length equal to size. The last chunk is padded if necessary.
>
> ? ? ?>>> list(chunk(range(1,10),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
> ? ? ?>>> list(chunk(range(1,9),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, 8, None]]
> ? ? ?>>> list(chunk(range(1,8),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, None, None]]
> ? ? ?>>> list(chunk(range(1,10),1))
> ? ? ?[[1], [2], [3], [4], [5], [6], [7], [8], [9]]
> ? ? ?>>> list(chunk(range(1,10),9))
> ? ? ?[[1, 2, 3, 4, 5, 6, 7, 8, 9]]
> ? ? ?>>> for X in chunk([],3): print X
> ? ? ?>>>
> ? ? ?'''
> ? ? ?n = len(seq)
> ? ? ?mod = n % size
> ? ? ?for i in xrange(0, n-mod, size):
> ? ? ? ? ?yield seq[i:i+size]
> ? ? ?if mod:
> ? ? ? ? ?padding = [pad] * (size-mod)
> ? ? ? ? ?yield seq[-mod:] + padding
>
> If you search the list archive, there is surely an example which will do
> the same for an arbitrary iterable (in general, you can't assume that
> `len(seq)` will work for an iterable that is not a list, set or tuple).
> But if you are just starting with Python, don't worry about this.

Aren't you making it out to be more mysterious than it needs to be?

Let's show the guy just a teensy bit of Python 102:

| >>> import string; data = string.ascii_lowercase
| >>> page_size = 6
| >>> pages = []
| >>> index = 0
| >>> for item in data:
| ...    if not index:
| ...       pages.append([])
| ...       shelve_it = pages[-1].append
| ...    index = (index + 1) % page_size
| ...    shelve_it(item)
| ...
| >>> pages
| [['a', 'b', 'c', 'd', 'e', 'f'], ['g', 'h', 'i', 'j', 'k', 'l'],
['m', 'n', 'o', 'p', 'q', 'r'], ['s', 't', 'u', 'v', 'w', 'x'], ['y',
'z']]
| >>>


From no.i.dont at want.mail.from.spammers.com  Thu Feb 12 04:07:53 2009
From: no.i.dont at want.mail.from.spammers.com (WP)
Date: Thu, 12 Feb 2009 10:07:53 +0100
Subject: Why does way_1() obtain the correct list but way_2() gets an empty
	list?
Message-ID: <6vi779Fk0ogtU1@mid.individual.net>

Hello group! This is probably a silly newbie mistake but consider the 
following program:

import libsbml

def getSBMLModel(biomodel_path):
     reader = libsbml.SBMLReader()

     sbml_doc = reader.readSBML(biomodel_path)
     sbml_model = None

     if sbml_doc.getNumErrors() > 0:
         print 'I couldn\'t read the file %s!' % biomodel_path
         return None
     else:
         sbml_model = sbml_doc.getModel()

     return sbml_doc.getModel() # None if file couldn't be opened


def way_1(biomodel_path):
     reader = libsbml.SBMLReader()
     sbml_doc = reader.readSBML(biomodel_path)
     sbml_model = sbml_doc.getModel()

     if sbml_model == None:
         return

     l = sbml_model.getListOfSpecies()
     print 'In way_1(): Got list %s with the length %i' % (l, len(l))


def way_2(biomodel_path):
     sbml_model = getSBMLModel(biomodel_path)

     if sbml_model == None:
         return

     l = sbml_model.getListOfSpecies()
     print 'In way_2(): Got list %s with the length %i' % (l, len(l))


file = '../BIOMD0000000003.xml'
# Changing the order of these two calls doesn't help, only way_1() works.
way_1(file)
way_2(file)

When run, the output is:
In way_1(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
type 'ListOfSpecies *' at 0x291c8bc> > with the length 3
In way_2(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
type 'ListOfSpecies *' at 0x27fb57c> > with the length 0

I don't get it way the species list obtained in way_2() is empty? For 
the input file I'm using I should be getting 3 species for the test file 
I'm using.
I'm sorry that this program uses a third-party library which is probably 
unknown to many, but since I make a lot of newbie mistakes I thought 
that it's very likely that this is a issue in how I use python, not a 
library issue. To compensate somewhat I tried to show my entire test 
program and its output and make that test program as clear as possible.

So if anyone knows why I get this behavior I would like to hear it and I 
will have learned something today too! :)

- WP


From deets at nospam.web.de  Thu Feb 12 04:22:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 10:22:33 +0100
Subject: Embed a web browser into a page
References: <gmvrd4$1njp$1@news.ett.com.ua>
Message-ID: <6vi82pFjn2ocU1@mid.uni-berlin.de>

Carbon Man wrote:

> Hi,
> I need to embed a web browser into a python page. I am coming from the MS
> world where I created an app that all of it's interfaces were actually web
> pages rendered in an Internet Explorer activex control. There was a object
> hook that allowed you to call into the host environment from javascript.
> Basically the host environment would receive the documentComplete event
> and call a method in the document's Javascript passing in an object
> reference. That reference would then be available for calls to be made
> from Javascript back into the host environment.
> I am just starting to explore the Pythonic programming jungle and I was
> wondering if there is a way to do something similar that would work
> cross-platform?
> I guess there is much more complexity in it when you start to go across
> o/s platform boundaries. The common web interface would then be Gecko or
> WebKit? So can someone suggest what would be required to build a
> cross-platform Python app that was capable of browsing HTML files,
> receiving events from the browser, and that allows the embedded page to
> call host Python modules from Javascript via an object reference? Or I am
> asking too much :)

The only thing that might work is Qt + webkit that is used as it's browser.
Everything else is not cross platform.

Diez


From Krzysztof.Retel at googlemail.com  Thu Feb 12 04:23:54 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Thu, 12 Feb 2009 01:23:54 -0800 (PST)
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
	<mailman.9371.1234400061.3487.python-list@python.org>
Message-ID: <8200f03c-886b-4520-87d4-6fc66515ad84@m40g2000yqh.googlegroups.com>

On Feb 12, 12:54?am, pyt... at bdurham.com wrote:
> Richard,
>
> An excellent tool. Great job!!!
>
> Thank you for sharing this with the Python community.
>
> Regards,
> Malcolm

Many thanks Richard and Josh.
I've just started my adventure with Python, and this document will
help me a lot.

Cheers,
K


From see.signature at no.spam  Thu Feb 12 04:29:44 2009
From: see.signature at no.spam (Eric Brunel)
Date: Thu, 12 Feb 2009 10:29:44 +0100
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
Message-ID: <op.uo8fbuazwepdt4@ericb.pragmadev>

On Thu, 12 Feb 2009 06:06:06 +0100, <argo785 at gmail.com> wrote:
[snip]
> My only (minor) complaint is that Tk
> doesn't draw text antialiased in the various widgets (menus, labels,
> buttons, etc.).

 From version 8.5 of tcl/tk, it's supposed to do it. See this page:
http://www.tcl.tk/software/tcltk/8.5.tml
under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only  
about X11 and Mac OS X; don't know if it works on Windows...
-- 
python -c "print ''.join([chr(154 - ord(c)) for c in  
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])"


From robin at reportlab.com  Thu Feb 12 05:08:11 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 12 Feb 2009 10:08:11 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <4993F50B.6060507@chamonix.reportlab.co.uk>

Graham Dumpleton wrote:
.........
> requests.
> 
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
.......
this is exactly what we do with the long runners. The wsgi (django in our case) 
process can work out how long the process is likely to take and either responds 
directly or offloads the job to an xmrpc server and responds with a page 
containing a token allowing access to the queue server which refreshes 
periodically to determine job status etc etc. When the job finishes the refresh 
request returns the job result and finishes looping. In our case we don't need 
to worry about people abandoning the job since the results are cached and may be 
of use to others (typical case produce brochure containing details of all 
resources in a country or large city). To avoid overload the xmlrpc server is 
only allowed to run 3 active threads from its queue.
-- 
Robin Becker



From anders.mackey at gmail.com  Thu Feb 12 05:40:15 2009
From: anders.mackey at gmail.com (Fisherking)
Date: Thu, 12 Feb 2009 02:40:15 -0800 (PST)
Subject: Match items in large list
Message-ID: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>

Hi,

I hope you can help me with this optimizing problem!
I have a large list of dictionaries (about 250 000 of them). Two or
more of these dictionaries contains the same data (not more than five
or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
(the dictionaries are really containg phone numbers, duration time and
call time.)

Which are the best way of searching through the list and extract the
items that are the same. In the first run I want to find every item
that are the same as {'a':1,'b':'2','c':3}, the second {'d':
4,'e':'5','f':6} etc. The list are not read-only and I can pop them
out of the list when I have found them!

(How can I found items that are almost the same? e.g. {'a':
1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )

In the second part of this program I need to take each of these items
(similar items are treated as one) and find these in a database that
contains 2.5M posts!

The python version I am bound to is Python 2.3

thanks for your help!


From andrew at acooke.org  Thu Feb 12 05:53:47 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 07:53:47 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
	<mailman.9376.1234407426.3487.python-list@python.org>
	<cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>
Message-ID: <2a92b74f3f992874208a231626423169.squirrel@localhost>

jeffg wrote:
> To be honest, this is not my code and I'm new to python.  It's part of
> the open source project NetworkX, but I'm using this one call
> extensively.  I'm also not that familiar with the math behind the
> physics.  I'll read the documents and see if I can figure it
> out.  :-)  Thank you for the links and suggestions.  I really need to
> get this code performing at peak levels.

the maths is quite simple really, if you know any physics.  it imagines
that a spring connects each point, and then works out what the total
effect of all the springs is.  that gives the net "push" on each point. 
it then goes through and moves each point a small amount in the direction
of the push (there's a "max" that makes no sense physically but probably
gives better numeric stability).

once they have moved, their positions have changed, so everything needs to
be calculated again, hence the iteration.

terry's suggestion was that, rather than working particle by particle, if
you can generalise the code to use matrices then you can use numpy.  that
would mean more of the calculation is done using C rather than Python, and
so would be a big speed-up.

that means that you need to rewrite the program so that you don't have the
for-loops in Python (for u.. and for v...).  instead you need to call
numpy to do array calculations.

that is going to give you much more speedup than what i recommended
(modifying the integration step at the end).

to be honest, although this is not hard if you are used to this kind of
thing, if the above isn't obvious it is quite a job.  you would probably
be better looking for a different library.  unfortunately i don't know of
one (i looked for exactly this a month or two ago and concluded i would
have to write my own; i didn't have time so i used a simpler layout).  i'm
really busy, or i would do this for you, because it's interesting and
useful.  but the code you have looks "amateur" - it wasn't written by
someone who does numerical work for a living.  that doesn't mean it's not
correct or that the original author was stupid, but it does mean that to
make it efficient means looking at the problem in a different way.

there are certainly (very good) java libraries that do this.  could you
use jpython and call out to one of those?  if so, that's probably your
best approach.

andrew




From http  Thu Feb 12 06:06:48 2009
From: http (Paul Rubin)
Date: 12 Feb 2009 03:06:48 -0800
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <7xy6wb3odz.fsf@ruckus.brouhaha.com>

Fisherking <anders.mackey at gmail.com> writes:
> Which are the best way of searching through the list and extract the
> items that are the same.

Sort the list, then scan through looking for duplicates, which will be
adjacent to each other.


From martin at marcher.name  Thu Feb 12 06:32:33 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 12:32:33 +0100
Subject: Match items in large list
In-Reply-To: <7xy6wb3odz.fsf@ruckus.brouhaha.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
	<7xy6wb3odz.fsf@ruckus.brouhaha.com>
Message-ID: <5fa6c12e0902120332h2381ff42t7585f8c3b83ad58e@mail.gmail.com>

Hi,

2009/2/12 Paul Rubin <http>:
> Fisherking <anders.mackey at gmail.com> writes:
>> Which are the best way of searching through the list and extract the
>> items that are the same.

hmmm how about using sqlites in memory database and let SQL take care
of finding that for you?

hth
Martin


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 12 06:54:55 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 12 Feb 2009 12:54:55 +0100
Subject: Why does way_1() obtain the correct list but way_2() gets an
	empty list?
In-Reply-To: <6vi779Fk0ogtU1@mid.individual.net>
References: <6vi779Fk0ogtU1@mid.individual.net>
Message-ID: <49940e09$0$5147$426a34cc@news.free.fr>

WP a ?crit :
> Hello group! This is probably a silly newbie mistake but consider the 
> following program:
> 
> import libsbml
> 
> def getSBMLModel(biomodel_path):
>     reader = libsbml.SBMLReader()
> 
>     sbml_doc = reader.readSBML(biomodel_path)
>     sbml_model = None
> 
>     if sbml_doc.getNumErrors() > 0:
>         print 'I couldn\'t read the file %s!' % biomodel_path

This should go to stderr. stdout is for normal program outputs.

>         return None

Also, Python has exception handling, which is usually a better solution 
than returning None or whatever.

>     else:

since you returned in the other branch, this else is useless

>         sbml_model = sbml_doc.getModel()
> 
>     return sbml_doc.getModel() # None if file couldn't be opened

You're calling  sbml_doc.getModel() a first time, binding the returned 
value to name sbml_model, then you're calling it a second time to return it.

A first fix:

import sys

def getSBMLModel(biomodel_path):
     reader = libsbml.SBMLReader()
     sbml_doc = reader.readSBML(biomodel_path)
     if sbml_doc.getNumErrors() > 0:
          # XXX : there's perhaps a better error message
          #       to get from sbml_doc ?
          print >> sys.stderr,  "I couldn't read the file %s!"\
                                 % biomodel_path
          return None

     return sbml_doc.getModel()


> 
> def way_1(biomodel_path):
>     reader = libsbml.SBMLReader()
>     sbml_doc = reader.readSBML(biomodel_path)
>     sbml_model = sbml_doc.getModel()
> 
>     if sbml_model == None:

Better to use the identity test here - None is garanteed to be a singleton:

       if sbml_model is None:

>         return
> 
>     l = sbml_model.getListOfSpecies()
>     print 'In way_1(): Got list %s with the length %i' % (l, len(l))
> 
> 
> def way_2(biomodel_path):
>     sbml_model = getSBMLModel(biomodel_path)
> 
>     if sbml_model == None:
>         return
> 
>     l = sbml_model.getListOfSpecies()
>     print 'In way_2(): Got list %s with the length %i' % (l, len(l))
> 
> 
> file = '../BIOMD0000000003.xml'

This shadows the builtin 'file' symbol. Better to use another name.

> # Changing the order of these two calls doesn't help, only way_1() works.
> way_1(file)
> way_2(file)
> 
> When run, the output is:
> In way_1(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
> type 'ListOfSpecies *' at 0x291c8bc> > with the length 3
> In way_2(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
> type 'ListOfSpecies *' at 0x27fb57c> > with the length 0
> 
> I don't get it way the species list obtained in way_2() is empty?

The only explanation I can imagine here would be that a second call to 
sbml_doc.getModel() doesn't return the same thing as the first... 
(remember, there are two calls in your getSBMLModel() function).

My 2 cents...


From steve at holdenweb.com  Thu Feb 12 06:56:38 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 12 Feb 2009 06:56:38 -0500
Subject: Functional schmunctional...
In-Reply-To: <00a501c98cd9$c8693620$0d00a8c0@hendrik>
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
	<gmuo5k$tdt$1@ger.gmane.org>
	<00a501c98cd9$c8693620$0d00a8c0@hendrik>
Message-ID: <49940E76.4030007@holdenweb.com>

Hendrik van Rooyen wrote:
> "Steve Holden" <ste....nweb.com> wrote:
> 
>> Jeez, doesn't anyone read the fine manual any more? I hope this was just
>> an academic exercise.
>>
>>>>> socket.inet_ntoa(struct.pack("!l", 1000000000))
>> '59.154.202.0'
>> Holden's rule: when it looks simple enough to be worth including in the
>> standard library it may well already *be* in the standard library.
> 
> Aaah! But how do you find it, if you don't already know
> where it lives and what it's called ?
> 
Well, my usual answer would be "Ask on c.l.py", but it appears that's no
longer reliable. Jeez, doesn't anyone ... (rinse and repeat).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From __peter__ at web.de  Thu Feb 12 07:09:05 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 12 Feb 2009 13:09:05 +0100
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <gn13gv$2q3$01$1@news.t-online.com>

Fisherking wrote:

> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)

I'd assume the dictionaries to look like

{"phone": "0123...", "duration": 5.67, "calltime": "10:42"}

What do the different keys ("a", "b", "c") versus ("d", "e", "f") mean?
 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!

items = [dict(a=1, b=2), dict(a=1, b=2), dict(a=3, c=2), dict(a=3, c=2.2),
dict(a=3, c=2.6)]

# 2.5
seen = set()
for row in items:
    rowkey = frozenset(row.iteritems())
    if rowkey in seen:
        print "dupe", row
    else:
        seen.add(rowkey)

# 2.3 (and older); not tested
seen = {}
for row in items:
    rowkey = row.items()
    rowkey.sort()
    rowkey = tuple(rowkey)
    if rowkey in seen:
        print "dupe", row
    else:
        seen[rowkey] = 1

> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )

If you are content with detecting similarities on a single "axis":

def window(items):
    items = iter(items)
    prev = items.next()
    for cur in items:
        yield cur, prev
        prev = cur

def todict(k, v, rest):
    d = dict(rest)
    d[k] = v
    return d

axis = "c"
d = {}
eps = 0.5
for row in items:
    row = dict(row)
    try:
        value = row.pop(axis)
    except KeyError:
        pass
    else:
        key = frozenset(row.iteritems())
        d.setdefault(key, []).append(value)

for key, values in d.iteritems():
    if len(values) > 1:
        for cur, prev in window(sorted(values)):
            if abs(cur-prev) < eps:
                print "similar rows", todict(axis, cur, key), todict(axis,
prev, key)
 
Otherwise you have to define a distance function and use a clustering
algorithm. Segaran's "Programming Collective Intelligence" has some
examples in Python, though the code can hardly be called idiomatic.

Peter


From notvalid2 at sbcglobal.net  Thu Feb 12 07:43:11 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 04:43:11 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
Message-ID: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>

It appears if one moves between IDLE and pythonWin (pyWin) that two separate 
loops (threads?) can occur, and that IDLE can produce incorrect results. 
Since I have preferred IDLE over pyWin, that leaves me currently in a 
quandry. How do I renew these processes, so that I can proceed with IDLE?

I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach 
some understanding of what was going on. Killing these tasks didn't help 
restore order to IDLE. It seems my only choice now is to reboot? Comments?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From deets at nospam.web.de  Thu Feb 12 07:47:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 13:47:09 +0100
Subject: Library similar to UserAgent (perl)
References: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>
Message-ID: <6vik2dFk1ph9U1@mid.uni-berlin.de>

mattia wrote:

> Hi everybody, I'm looking for an easy way to put data in a form, then
> click the button and follow the redirect. Also I need to use cookies. I
> read that using perl this can be done using the UserAgent lib, that also
> provide th browser functionality to let the site believe that you are
> getting the pages from a normali browser like ff. Any suggestion? I think
> that the main concen is to easilly put the data in the numerous textlabel
> provided and then magically simulate the 'click me' button.

Python mechanize.

Diez


From comp.ogz at gmail.com  Thu Feb 12 08:38:03 2009
From: comp.ogz at gmail.com (Oguz Yarimtepe)
Date: Thu, 12 Feb 2009 15:38:03 +0200
Subject: xacml api info request
Message-ID: <20831c740902120538y2f0896bcw3a73067a0223bd2e@mail.gmail.com>

I am looking for how can i use XACML with Python. Anybody who had used xacml
with python or and idea?

Thanx.

-- 
O?uz Yar?mtepe
www.loopbacking.info
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From benjamin.kaplan at case.edu  Thu Feb 12 08:41:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 12 Feb 2009 08:41:53 -0500
Subject: cannot install
In-Reply-To: <9CB4135F-EACF-4DE5-B2C9-F0C20A3E8D69@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
	<ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>
	<5929AA4E-C3C7-42FE-93B0-6D1F11932B73@volny.cz>
	<ec96e1390902100535p7075ce98kf8ef72f8251f7b2a@mail.gmail.com>
	<9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
	<ec96e1390902110523u7cf76a01k738d535533bc10c7@mail.gmail.com>
	<9CB4135F-EACF-4DE5-B2C9-F0C20A3E8D69@volny.cz>
Message-ID: <ec96e1390902120541r120ad3dfm1232f07ac78c23ab@mail.gmail.com>

On Thu, Feb 12, 2009 at 3:41 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:

> Here is config.log:
>
> This file contains any messages produced by compilers while
> running configure, to aid debugging if configure makes a mistake.
>
> It was created by python configure 3.0, which was
> generated by GNU Autoconf 2.61.  Invocation command line was
>
>   $ ./configure --enable-framework
>
> ## --------- ##
> ## Platform. ##
> ## --------- ##
>
> hostname = Macintosh.local
> uname -m = i386
> uname -r = 9.6.0
> uname -s = Darwin
> uname -v = Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008;
> root:xnu-1228.9.59~1/RELEASE_I386
>
> /usr/bin/uname -p = i386
> /bin/uname -X     = unknown
>
> /bin/arch              = unknown
> /usr/bin/arch -k       = unknown
> /usr/convex/getsysinfo = unknown
> /usr/bin/hostinfo      = Mach kernel version:
>  Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008;
> root:xnu-1228.9.59~1/RELEASE_I386
> Kernel configured for up to 2 processors.
> 2 processors are physically available.
> 2 processors are logically available.
> Processor type: i486 (Intel 80486)
> Processors active: 0 1
> Primary memory available: 4.00 gigabytes
> Default processor set: 101 tasks, 414 threads, 2 processors
> Load average: 1.02, Mach factor: 0.99
> /bin/machine           = unknown
> /usr/bin/oslevel       = unknown
> /bin/universe          = unknown
>
> PATH: /opt/local/bin
> PATH: /opt/local/sbin
> PATH: /Developer/usr/bin
> PATH: /usr/bin
> PATH: /bin
> PATH: /usr/sbin
> PATH: /sbin
> PATH: /Users/admin
> PATH: /usr/local/bin
> PATH: /usr/X11/bin
>
>
> ## ----------- ##
> ## Core tests. ##
> ## ----------- ##
>
> configure:1900: checking for --with-universal-archs
> configure:1912: result: 32-bit
> configure:2033: checking MACHDEP
> configure:2197: result: darwin
> configure:2208: checking machine type as reported by uname -m
> configure:2211: result: i386
> configure:2224: checking for --without-gcc
> configure:2250: result: no
> configure:2311: checking for gcc
> configure:2327: found /Developer/usr/bin/gcc
> configure:2338: result: gcc
> configure:2576: checking for C compiler version
> configure:2583: gcc --version >&5
> i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5490)
> Copyright (C) 2005 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> configure:2586: $? = 0
> configure:2593: gcc -v >&5
> Using built-in specs.
> Target: i686-apple-darwin9
> Configured with: /var/tmp/gcc/gcc-5490~1/src/configure --disable-checking
> -enable-werror --prefix=/usr --mandir=/share/man
> --enable-languages=c,objc,c++,obj-c++
> --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/
> --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib
> --build=i686-apple-darwin9 --with-arch=apple --with-tune=generic
> --host=i686-apple-darwin9 --target=i686-apple-darwin9
> Thread model: posix
> gcc version 4.0.1 (Apple Inc. build 5490)
> configure:2596: $? = 0
> configure:2603: gcc -V >&5
> gcc-4.0: argument to `-V' is missing
> configure:2606: $? = 1
> configure:2629: checking for C compiler default output file name
> configure:2656: gcc    conftest.c  >&5
> ld: library not found for -lcrt1.10.5.o
> collect2: ld returned 1 exit status
> configure:2659: $? = 1
> configure:2697: result:
> configure: failed program was:
> | /* confdefs.h.  */
> | #define _GNU_SOURCE 1
> | #define _NETBSD_SOURCE 1
> | #define __BSD_VISIBLE 1
> | #define _BSD_TYPES 1
> | #define _DARWIN_C_SOURCE 1
> | /* end confdefs.h.  */
> |
> | int
> | main ()
> | {
> |
> |   ;
> |   return 0;
> | }
> configure:2704: error: C compiler cannot create executables
> See `config.log' for more details.
>
> ## ---------------- ##
> ## Cache variables. ##
> ## ---------------- ##
>
> ac_cv_env_CC_set=
> ac_cv_env_CC_value=
> ac_cv_env_CFLAGS_set=
> ac_cv_env_CFLAGS_value=
> ac_cv_env_CPPFLAGS_set=
> ac_cv_env_CPPFLAGS_value=
> ac_cv_env_CPP_set=
> ac_cv_env_CPP_value=
> ac_cv_env_LDFLAGS_set=
> ac_cv_env_LDFLAGS_value=
> ac_cv_env_LIBS_set=
> ac_cv_env_LIBS_value=
> ac_cv_env_build_alias_set=
> ac_cv_env_build_alias_value=
> ac_cv_env_host_alias_set=
> ac_cv_env_host_alias_value=
> ac_cv_env_target_alias_set=
> ac_cv_env_target_alias_value=
> ac_cv_prog_ac_ct_CC=gcc
>
> ## ----------------- ##
> ## Output variables. ##
> ## ----------------- ##
>
> AR=''
> ARCH_RUN_32BIT=''
> BASECFLAGS=''
> BLDLIBRARY=''
> BLDSHARED=''
> BUILDEXEEXT=''
> CC='gcc'
> CCSHARED=''
> CFLAGS=''
> CFLAGSFORSHARED=''
> CONFIGURE_MACOSX_DEPLOYMENT_TARGET=''
> CONFIG_ARGS=' '\''--enable-framework'\'''
> CPP=''
> CPPFLAGS=''
> CXX=''
> DEFS=''
> DLINCLDIR=''
> DLLLIBRARY=''
> DYNLOADFILE=''
> ECHO_C='ECHO_N=''
> ECHO_T=''
> EGREP=''
> EXEEXT=''
> EXPORT_MACOSX_DEPLOYMENT_TARGET='#'
> FRAMEWORKALTINSTALLFIRST='frameworkinstallstructure bininstall maninstall'
> FRAMEWORKALTINSTALLLAST='frameworkinstallmaclib frameworkinstallapps
> frameworkaltinstallunixtools'
> FRAMEWORKINSTALLFIRST='frameworkinstallstructure'
> FRAMEWORKINSTALLLAST=''
> FRAMEWORKUNIXTOOLSPREFIX='/usr/local'
> GREP=''
> HAVE_GETHOSTBYNAME=''
> HAVE_GETHOSTBYNAME_R=''
> HAVE_GETHOSTBYNAME_R_3_ARG=''
> HAVE_GETHOSTBYNAME_R_5_ARG=''
> HAVE_GETHOSTBYNAME_R_6_ARG=''
> INSTALL_DATA=''
> INSTALL_PROGRAM=''
> INSTALL_SCRIPT=''
> INSTSONAME=''
> LDFLAGS=''
> LDLAST=''
> LDLIBRARY=''
> LDLIBRARYDIR=''
> LDSHARED=''
> LIBC=''
> LIBM=''
> LIBOBJS=''
> LIBRARY=''
> LIBS=''
> LIBTOOL_CRUFT=''
> LINKCC=''
> LINKFORSHARED=''
> LN=''
> LTLIBOBJS=''
> MACHDEP='darwin'
> MACHDEP_OBJS=''
> MAINCC=''
> OBJEXT=''
> OPT=''
> OTHER_LIBTOOL_OPT=''
> PACKAGE_BUGREPORT='http://www.python.org/python-bugs'<http://www.python.org/python-bugs%27>
> PACKAGE_NAME='python'
> PACKAGE_STRING='python 3.0'
> PACKAGE_TARNAME='python'
> PACKAGE_VERSION='3.0'
> PATH_SEPARATOR=':'
> PYTHONFRAMEWORK='Python'
> PYTHONFRAMEWORKDIR='Python.framework'
> PYTHONFRAMEWORKIDENTIFIER='org.python.python'
> PYTHONFRAMEWORKINSTALLDIR='/Library/Frameworks/Python.framework'
> PYTHONFRAMEWORKPREFIX='/Library/Frameworks'
> RANLIB=''
> RUNSHARED=''
> SGI_ABI=''
> SHELL='/bin/sh'
> SHLIBS=''
> SIGNAL_OBJS=''
> SO=''
> SOVERSION='1.0'
> SRCDIRS=''
> SVNVERSION=''
> THREADHEADERS=''
> THREADOBJ=''
> TRUE=''
> UNIVERSALSDK=''
> UNIVERSAL_ARCH_FLAGS=''
> USE_SIGNAL_MODULE=''
> USE_THREAD_MODULE=''
> VERSION='3.0'
> ac_ct_CC='gcc'
> bindir='${exec_prefix}/bin'
> build_alias=''
> datadir='${datarootdir}'
> datarootdir='${prefix}/share'
> docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
> dvidir='${docdir}'
> exec_prefix='NONE'
> host_alias=''
> htmldir='${docdir}'
> includedir='${prefix}/include'
> infodir='${datarootdir}/info'
> libdir='${exec_prefix}/lib'
> libexecdir='${exec_prefix}/libexec'
> localedir='${datarootdir}/locale'
> localstatedir='${prefix}/var'
> mandir='${datarootdir}/man'
> oldincludedir='/usr/include'
> pdfdir='${docdir}'
> prefix='/Library/Frameworks/Python.framework/Versions/3.0'
> program_transform_name='s,x,x,'
> psdir='${docdir}'
> sbindir='${exec_prefix}/sbin'
> sharedstatedir='${prefix}/com'
> sysconfdir='${prefix}/etc'
> target_alias=''
>
> ## ----------- ##
> ## confdefs.h. ##
> ## ----------- ##
>
> #define _GNU_SOURCE 1
> #define _NETBSD_SOURCE 1
> #define __BSD_VISIBLE 1
> #define _BSD_TYPES 1
> #define _DARWIN_C_SOURCE 1
>
> configure: exit 77
>
> On 11.2.2009, at 14:23, Benjamin Kaplan wrote:
>
>
>
> 2009/2/11 administrator <vzupka at volny.cz>
>
>> I tried as admin with Python-3.0 in my home directory but no success yet.
>> Is there another help?
>>
>> Macintosh:~ admin$ export
>> PATH=/opt/local/bin:/opt/local/sbin:/Developer/usr/bin:$PATH
>> Macintosh:~ admin$ echo $PATH
>>
>> /opt/local/bin:/opt/local/sbin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/admin:/usr/local/bin:/usr/X11/bin
>> Macintosh:~ admin$ cd ~/Python-3.0
>> Macintosh:Python-3.0 admin$ pwd
>> /Users/admin/Python-3.0
>> Macintosh:Python-3.0 admin$ sudo ./configure --enable-framework
>> checking for --with-universal-archs... 32-bit
>> checking MACHDEP... darwin
>> checking machine type as reported by uname -m... i386
>> checking for --without-gcc... no
>> checking for gcc... gcc
>> checking for C compiler default output file name...
>> *configure: error: C compiler cannot create executables*
>> See `config.log' for more details.
>> Macintosh:Python-3.0 admin$
>>
>
>
>
> What does config.log say?
>
>
>>
>> Hmm. Not much useful there. Do you have XCode installed? Maybe someone
else has seen this before and can help.
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From james at agentultra.com  Thu Feb 12 09:06:00 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 09:06:00 -0500
Subject: [ANN] TracShell 0.1 released
Message-ID: <85ab8rkawn.fsf@agentultra.com>


I tend to work a lot with Trac for project management and have always
found the browser interface to be a productivity killer. I always
wanted a simple command-line interface to Trac, but having never found
one I found a little free time and got off my laurels to make one.

TracShell 0.1 is an early release, but it works. So far you can only
query and view tickets, but planned updates include the obvious
ability to create and edit tickets. Future plans will allow browsing
of comments, change histories, attachments, and so forth.

Please consider it really beta. The code needs a little tidying up
around the edges. If you find any bugs, please report them and I'll
fix them ASAP. Ideas, suggestions, and contributions are welcome.

http://code.google.com/p/tracshell/

Cheers.


From deets at nospam.web.de  Thu Feb 12 09:07:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 15:07:43 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
Message-ID: <6viopfFkcasmU1@mid.uni-berlin.de>

W. eWatson wrote:

> It appears if one moves between IDLE and pythonWin (pyWin) that two
> separate loops (threads?) can occur, and that IDLE can produce incorrect
> results. Since I have preferred IDLE over pyWin, that leaves me currently
> in a quandry. How do I renew these processes, so that I can proceed with
> IDLE?
 
> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
> some understanding of what was going on. Killing these tasks didn't help
> restore order to IDLE. It seems my only choice now is to reboot? Comments?

Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
processes, including of course the main programs. Which *should* be
anything that is needed anyway. 

And you still seem to not understand what is really happening.

Working between pywin and idle is perfectly fine, they are separate
programs. You can start as many instances of a program as you want and
happily work with them. Even several instances of idle and pywin, unless
these come with some logic to prevent multiple starts  - some windows app
do that.

What does *NOT* work is writing a Tkinter-based app in idle, and to run it
*FROM INSIDE* idle. Instead, open your explorer and double-click on the
pyhton-file your app is in. That's all that there is to it.

Diez


From gideon.smeding at gmail.com  Thu Feb 12 09:08:51 2009
From: gideon.smeding at gmail.com (gideon)
Date: Thu, 12 Feb 2009 06:08:51 -0800 (PST)
Subject: An executable operational semantics for Python
Message-ID: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>

Hi everybody,

I've recently finished my Master's thesis on the semantics of Python.
In my thesis I define the semantics of Python by rewriting an abstract
machine. The sources that are used to produce my thesis can also be
compiled into a working interpreter. Hence I call it an 'executable'
semantics.

Anyone interested should have a look at the short intro I put on my
web page:
http://gideon.smdng.nl/2009/01/an-executable-operational-semantics-for-python/



From Krzysztof.Retel at googlemail.com  Thu Feb 12 09:53:49 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Thu, 12 Feb 2009 06:53:49 -0800 (PST)
Subject: TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
Message-ID: <f97de861-a59b-463b-9297-f1414bdf0815@z1g2000yqn.googlegroups.com>

On 12 Feb, 14:06, J Kenneth King <ja... at agentultra.com> wrote:
> I tend to work a lot with Trac for project management and have always
> found the browser interface to be a productivity killer. I always
> wanted a simple command-line interface to Trac, but having never found
> one I found a little free time and got off my laurels to make one.
>
> TracShell 0.1 is an early release, but it works. So far you can only
> query and view tickets, but planned updates include the obvious
> ability to create and edit tickets. Future plans will allow browsing
> of comments, change histories, attachments, and so forth.
>
> Please consider it really beta. The code needs a little tidying up
> around the edges. If you find any bugs, please report them and I'll
> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>
> http://code.google.com/p/tracshell/
>
> Cheers.

Nice work.

Maybe it would be worth building at some point vim or emacs interface.

Krzysztof


From notvalid2 at sbcglobal.net  Thu Feb 12 09:57:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 06:57:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <6viopfFkcasmU1@mid.uni-berlin.de>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
Message-ID: <2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>

Diez B. Roggisch wrote:
> W. eWatson wrote:
> 
>> It appears if one moves between IDLE and pythonWin (pyWin) that two
>> separate loops (threads?) can occur, and that IDLE can produce incorrect
>> results. Since I have preferred IDLE over pyWin, that leaves me currently
>> in a quandry. How do I renew these processes, so that I can proceed with
>> IDLE?
>  
>> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
>> some understanding of what was going on. Killing these tasks didn't help
>> restore order to IDLE. It seems my only choice now is to reboot? Comments?
> 
> Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
> processes, including of course the main programs. Which *should* be
> anything that is needed anyway. 
Done that. Been there. It doesn't work. If I take another py tkinter program 
and run it in IDLE, it *will work*. The current program goes boom.
> 
> And you still seem to not understand what is really happening.
Whether I understand it exactly or not is not the issue. The issue is how do 
I execute IDLE *now* to get the correct results it once allowed? The fact of 
the matter is that I was happily working in IDLE for days and hours. I 
encountered a problem in IDLE that seemed suspicious, so I then fired up 
pyWin to see if it gave the same results. It worked fine. Then my problems 
with IDLE got worse.
> 
> Working between pywin and idle is perfectly fine, they are separate
> programs. You can start as many instances of a program as you want and
> happily work with them. Even several instances of idle and pywin, unless
> these come with some logic to prevent multiple starts  - some windows app
> do that.
How could this be true; otherwise,  I wouldn't be complaining?
> 
> What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> pyhton-file your app is in. That's all that there is to it.
Personally, I like running entirely in IDLE.

If there is no other way than you suggested in "NOT work", then I may just 
uninstall pyWin.
> 
> Diez


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From btaylordesign at gmail.com  Thu Feb 12 10:13:58 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 12 Feb 2009 07:13:58 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
Message-ID: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>

Hello everyone,

I'm Brandon Taylor, senior web developer with the University of Texas
at Austin. We're using Python 2.6.1 and having a lot of difficulty
getting the cx_Oracle-5.0 library to install on one of our MacBooks
running OS X 10.5.6.

We can get cx_Oracle to compile, but after running setup.py install
and trying to import the library, we are getting an error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
___divdi3
  Referenced from: /Users/mas80/Library/Oracle/instantclient_10_2/
libclntsh.dylib.10.1
  Expected in: flat namespace


Can anyone shed some light on how we can solve this issue? It's a show
stopper for us of we can not connect to Oracle from Python.

Kind regards,
Brandon Taylor


From dear.jay.logan at gmail.com  Thu Feb 12 10:15:29 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 07:15:29 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <b999d3ed-96fc-41d0-8741-26059b0640fd@v38g2000yqb.googlegroups.com>

On Feb 11, 8:22?pm, Basilisk96 <basilis... at gmail.com> wrote:
> Hello all,
>
> I have the following function that uses an intermediate iterator
> "rawPairs":
>
> def MakePairs(path):
> ? ? import os
> ? ? import operator
> ? ? join = os.path.join
> ? ? rawPairs = (
> ? ? ? ? (join(path, s), func(s))
> ? ? ? ? for s in os.listdir(path)
> ? ? ? ? if func(s) is not None and func(s).endswith("some criterion")
> ? ? )
> ? ? #Use the second item in the pair as the sort criterion
> ? ? result = sorted(rawPairs, key=operator.itemgetter(1))
> ? ? return result
>
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration? ?Perhaps a lambda
> construct, but I am not sure how to go about it...?
>
> Cheers,
> Basilisk96

Hi,
Try something like this:

import os
from os.path import join
from itertools import ifilter #assuming 2.5 and earlier, for 3.0 just
use the filter builtin
from operator import itemgetter

def isvalid(pair):
    return (s[1] is not None) and s[1].endswith('some criteria')

def makepairs(path):
    pair_iter = ((join(path,s), func(s)) for s in os.listdir(path))
    pair_iter = ifilter(isvalid, pair_iter)
    result = sorted(pair_iter, key=itemgetter(1))

    return result




From james at agentultra.com  Thu Feb 12 10:26:13 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 10:26:13 -0500
Subject: TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
	<f97de861-a59b-463b-9297-f1414bdf0815@z1g2000yqn.googlegroups.com>
Message-ID: <8563jfk76y.fsf@agentultra.com>

Krzysztof Retel <Krzysztof.Retel at googlemail.com> writes:

> On 12 Feb, 14:06, J Kenneth King <ja... at agentultra.com> wrote:
>> I tend to work a lot with Trac for project management and have always
>> found the browser interface to be a productivity killer. I always
>> wanted a simple command-line interface to Trac, but having never found
>> one I found a little free time and got off my laurels to make one.
>>
>> TracShell 0.1 is an early release, but it works. So far you can only
>> query and view tickets, but planned updates include the obvious
>> ability to create and edit tickets. Future plans will allow browsing
>> of comments, change histories, attachments, and so forth.
>>
>> Please consider it really beta. The code needs a little tidying up
>> around the edges. If you find any bugs, please report them and I'll
>> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>>
>> http://code.google.com/p/tracshell/
>>
>> Cheers.
>
> Nice work.
>
> Maybe it would be worth building at some point vim or emacs interface.
>
> Krzysztof

Thanks. :)

I considered a native editor interface, but since both vi and emacs
can run a shell within a buffer, I decided to go with a more flexible
solution.

However, if someone wanted to, the actual code fetching and displaying
the data isn't tied directly to the shell interface. It could be
possible to dispatch calls from a native editor front-end if it
doesn't mind spawning a python interpreter (or keeping one running)
for each request.

Anyway, thanks for checking it out. Hope you find it useful. I do. :)


From ivanov.maxim at gmail.com  Thu Feb 12 10:27:44 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 07:27:44 -0800 (PST)
Subject: Could you recommend job schedulling solution?
References: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
	<mailman.9347.1234382437.3487.python-list@python.org>
Message-ID: <33403be1-8a8a-4e28-9d0e-12fbfd4b7510@j39g2000yqn.googlegroups.com>

>
> I think parallel python will take of that for you
> (http://www.parallelpython.com/)

I've found that RPyC (http://rpyc.wikidot.com/) is quite usefull for
my task.  It allows me to build RPC service which accepts ordinary
python function from client and return result in synchronous or
asynchronous way. Of course it is able to serve multiple clients and
it's forking server help me to solve GIL problems on intense
calculations inside Python code.

Some limitations are present, like the fact that you couldn't send on
execution any code which use C extensions which are not present on RPC
server, but I didn't expect this could work at all, so in general RPyC
makes me happy.


From xahlee at gmail.com  Thu Feb 12 10:30:26 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 12 Feb 2009 07:30:26 -0800 (PST)
Subject: some history of computing and celebrities [was lisp machine 
	keyboards]
References: <1935645c-5b26-4287-b492-cdb2834aa4c9@b38g2000prf.googlegroups.com>
Message-ID: <70d7a15d-6c9d-4145-b718-1e83cbac510e@40g2000prx.googlegroups.com>

On Feb 12, 7:28?am, Xah Lee <xah... at gmail.com> wrote:
> lisp machine keyboards.
>
> ? Knite keyboard. I think this is one of the earlist.http://world.std.com/~jdostale/kbd/Knight.html
>
> ? Symbolics earlier style keyboard (PN 364000), by Peter Painehttp://www.asl.dsl.pipex.com/symbolics/photos/IO/kbd-older.html
>
> Symbolics later model Symbolics keyboard PN 365407 Rev C
> at Joey Devilla's blog, several hi quality photoshttp://www.globalnerdy.com/2009/02/05/hacklabtos-lisp-machine-keyboard/
>
> also at Rainer site, with info on how to use it on mac os xhttp://lispm.dyndns.org/news?ID=NEWS-2008-07-27-1
>
> one of the most funny comment from Joey's blog is:
> ?Man, my pinkies are getting tired just looking at that thing.?
>
> of course, the most baroque, showy, with a fancy name is the
> Space-cadet keyboard
> ?http://xahlee.org/emacs/emacs_kb_shortcuts_pain.html
>
> Space-cadet! LOL.
>
> btw, how did that name came to be?
>
> ? Xah
> ?http://xahlee.org/
>
> ?


while nosing about lisp machines, i checked out the Wikipedia article
on Symbolics again:
 http://en.wikipedia.org/wiki/Symbolics

it's content has improved significantly since last year or so i
checked.

My firts daily use of computer or owning one is ~1991, and didn't
really become pro after 1995. So, lisp machines are before my time.
Though, i have already had some interest in lisp history and have
strong interest in the the history of how the motherfucking unix
tookover its/lisp/vms/whatnot war. Reading such history is usually not
easy, because you are bombarded with many OSes or technologies that
you are not familiar and really difficult to understand its situation
without having lived in the tech of that era...

anyhow, check out some of the interesting tidbits in the article:

?Symbolics staffers Dan Weinreb, David Moon, Neal Feinberg, Kent
Pitman, Scott McKay, Sonya Keene and others made significant
contributions to the emerging Common Lisp language standard from the
mid-1980s through the release of the ANSI Common Lisp standard in
1994?

There, Dan Weinred, Kent Pitman, 2 guy who still write here sometimes,
are mentioned. (Kent i knew as a online acquaintance since ~2000 here.
Dan i knew only last year.)

Also note how Richard Stallman, who the open sourcing or FSF fuckheads
take to be a god unquestioned, who was at the time simply doing
questionable deeds. (note that in general, history doesn't have a
right and wrong. How came out as winner, is the hero.)

Given the Symbolic vs MIT/RMS situation, one can question what is the
interpersonal relation or formal relation between these people with
RMS. (in general, often many historical issue or truth cannot be
discussed when the persons are still alive, for many real life
complexities.)

Also of interest is tat Scott McKay, the Sun Micro guy, is there
too...

O, a wee bit of rambling.

?Advances in garbage collection techniques by Henry Baker, David Moon
and others, particularly the first commercial use of generational
scavenging, allowed Symbolics computers to run large Lisp programs for
months at a time.?

interesting to me is seeing the name Henry Baker. He has wrote a few
articles i've came cross in the past and enjoyed.

? ?Buffer Overflow? Security Problems, (2001), by Henry G Baker
  http://catless.ncl.ac.uk/Risks/21.84.html#subj10.1

? Communications of the ACM 34, 4 (April 1991), 18. Henry G Baker,
1990. (On the harm of speed)
 http://home.pipeline.com/~hbaker1/letters/CACM-DubiousAchievement.html

? ?Iterators: Signs of Weakness in Object-Oriented Languages? (1992)
By Henry G Baker.
http://home.pipeline.com/~hbaker1/Iterator.html

I'm posting this to python group too, for the last article above about
iterators. I whole heartedly agree to all Henry's opinions... often
today's hotshot programing morons have no understanding fuck. Python 3
is going full with iterators and enumerators fuck.

i'd link to few articles i wrote pertinent to some of the above
issues... but think rather not, since i've already done that often.

  Xah
? http://xahlee.org/

?



From ivanov.maxim at gmail.com  Thu Feb 12 10:31:57 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 07:31:57 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
References: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>
Message-ID: <68b98811-6352-4b84-952a-c5e0209e8bd3@x9g2000yqk.googlegroups.com>

> ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
> lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
> ___divdi3

You didn't link cx_Oracle.so all libs which it use. run "ldd -r
cx_Oracle.so" and you'll have an idea about all missing symbols. The
names of missed symbols could give you an idea what else should
cx_Oracle.so should be linked with



From GDoermann at gmail.com  Thu Feb 12 10:44:57 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 07:44:57 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
Message-ID: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>

Ok, so I noticed some of the modules (such as many of the datetime
attributes) are read-only, which means the __setattr__ and __set__
methods are intercepted... pretty easy.  I am looking for a way to
automate this.  The real goal is not to have read only attributes, but
to have getters and setters that are automatically called when a
property is called.  The getting is pretty easily achieved by setting
the metaclass which also creates the properties.  What I have so far
will protect the get_ and set_ methods as well as the properties that
call the get methods.  The reasoning for this is that I don't want
someone accidentally overwriting the property when the class uses a
private class variable.  What I have so far:



class ReadOnlyMeta(type):
	def __new__(cls, name, bases, methoddict):
		pname = '_%s__protected_items' %(name)
		protected = [pname]
		methoddict[pname] = protected
		for key, value in methoddict.items():
			if key.startswith("get_"):
				methoddict[key[4:]] = property(value)
				protected.append(key[4:])
				protected.append(key)
			elif key.startswith("set_"):
				protected.append(key)
		return type.__new__(cls, name, bases, methoddict)

class ReadOnly(object):
	__metaclass__ = ReadOnlyMeta

	def __check_private(self, name, msg = None):
		if name in self.__protected_items:
			if msg is None:
				msg = "'%s' of '%s' is Read only." %(name,
self.__class__.__name__)
			raise AttributeError(msg)

	def __setattr__(self, name, value):
		self.__check_private(name, "attribute '%s' of '%s' objects is not
writable" %(name, self.__class__.__name__))
		self.__dict__[name] = value

	def __delattr__(self, name):
		self.__check_private(name, "attribute '%s' of '%s' objects cannot be
removed" %(name, self.__class__.__name__))
		self.__dict__.pop(name)

	def __set__(self, instance, value):
		self.__check_private(instance, "You cannot remap the method '%s'" %
(instance))
		self.__dict__[instance] = value



I then implement this by creating a subclass of the read only class:

class MyClass(ReadOnly):
	def __init__(self, x):
		self.set_x(x)

	def get_x(self):
		return self.__x

	def set_x(self, x):
		print 'Hello the setter was called!'
		self.__x = x


What I want is to be able to auto-call the set_ methods whenever
someone tries to call a method that has a setter.  This could be done
by each class... tedious!  I want automation!  To do this I have tried
adding a list of setters to the metaclass and then in the __set__ and
__setattr__ methods I check to see if 'set_%s' %(variable) exists in
the list... if it does I call the method.  This would work, however
there are two lists of setters (in the example above), the ReadOnly
list and a MyClass list.  When you print out a dir(self) IN the
ReadOnly class from an implementation (MyClass) it will show the
MyClass attributes, however they cannot be called from the parent
class... so my real question... how can you (or can you ever) call a
child method from a parent class without explicitly passing the
callable?

I hope this hasn't been too confusing... or made your head hurt like
mine does...  If you want more code examples of what I have tried and
the out put... I'd be happy to give them.

Greg






From deets at nospam.web.de  Thu Feb 12 10:55:55 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 16:55:55 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
Message-ID: <6viv4bFk8gonU1@mid.uni-berlin.de>

> Done that. Been there. It doesn't work. If I take another py tkinter
> program and run it in IDLE, it *will work*. The current program goes boom.

That's pure luck then. IDLE is written in Tkinter, and *running* Tkinter
apps inside of it is bound to fail sooner or later. Failure might be as
drastic as termination of IDLE, or just some glitches.

This has hit numerous people before, as you've been told several times now.
What makes you think it doesn't affect you?

>> 
>> And you still seem to not understand what is really happening.
> Whether I understand it exactly or not is not the issue. The issue is how
> do I execute IDLE *now* to get the correct results it once allowed? The
> fact of the matter is that I was happily working in IDLE for days and
> hours. I encountered a problem in IDLE that seemed suspicious, so I then
> fired up pyWin to see if it gave the same results. It worked fine. Then my
> problems with IDLE got worse.
>> 
>> Working between pywin and idle is perfectly fine, they are separate
>> programs. You can start as many instances of a program as you want and
>> happily work with them. Even several instances of idle and pywin, unless
>> these come with some logic to prevent multiple starts  - some windows app
>> do that.
> How could this be true; otherwise,  I wouldn't be complaining?

Coincidence? When Mom tells me the car broke down after she passed by the
bakery, I don't assume one has to do with the other either.

>> What does *NOT* work is writing a Tkinter-based app in idle, and to run
>> it *FROM INSIDE* idle. Instead, open your explorer and double-click on
>> the pyhton-file your app is in. That's all that there is to it.
> Personally, I like running entirely in IDLE.

This is not a question of your liking, it's a question of technical
feasibility.

if you have been working happily for hours and days as you tell us, I can
only hope & assume that you made actual progress. Which might have brought
your own program to a point where it wasn't tolerable working from within
idle anymore. That you in the meanttime chose to work with Pywin is
irrelevant to that.
 
> If there is no other way than you suggested in "NOT work", then I may just
> uninstall pyWin.

Do so if you like - cargo cult programming isn't uncommon these days.

Diez


From GDoermann at gmail.com  Thu Feb 12 10:58:32 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 07:58:32 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
Message-ID: <61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com>

Oh... one other thing that would be really cool is to do this with AOP/
descriptors!  I just haven't been able to get that to work either.
Basics...

@readonly
class MyClass(object):
        def __init__(self, x):
                self.set_x(x)

        def get_x(self):
                return self.__x

        def set_x(self, x):
                print 'Hello the setter was called!'
                self.__x = x

and it's done!  I don't think this will work because (maybe I'm wrong)
but I don't think you can set the metaclass in the descriptor???  If
this is the case, it is more work to do the AOP and set a metaclass...
better to just inherit.  If it can be done... that would be awesome!

Greg


From catherine.heathcote at gmail.com  Thu Feb 12 11:03:05 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:03:05 GMT
Subject: Embarrasing questio
Message-ID: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>

But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
trying to do something simple, the python equivilent of:

if(i % 3 == 0 || i % 5 == 0)

Thanks.


From GDoermann at gmail.com  Thu Feb 12 11:07:13 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:07:13 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>

On Feb 12, 9:03?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> trying to do something simple, the python equivilent of:
>
> if(i % 3 == 0 || i % 5 == 0)
>
> Thanks.

if i % 3  == 0 or i % 5 == 0



From GDoermann at gmail.com  Thu Feb 12 11:07:48 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:07:48 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>

On Feb 12, 9:03?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> trying to do something simple, the python equivilent of:
>
> if(i % 3 == 0 || i % 5 == 0)
>
> Thanks.

in 2.5 and above you can do
if any(i%3 == 0, i%5 == 0)


From aahz at pythoncraft.com  Thu Feb 12 11:11:51 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 Feb 2009 08:11:51 -0800
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <gn1ho7$ckj$1@panix3.panix.com>

In article <ZKXkl.34048$Sp5.7221 at text.news.virginmedia.com>,
Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>
>But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
>trying to do something simple, the python equivilent of:
>
>if(i % 3 == 0 || i % 5 == 0)

if i % 3 == 0 or i % 5 == 0:

You may find it worthwhile to quickly step through everything in the
standard Python tutorial, it covers lots of stuff like this.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From catherine.heathcote at gmail.com  Thu Feb 12 11:12:03 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:12:03 GMT
Subject: Embarrasing questio
In-Reply-To: <6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>
Message-ID: <nTXkl.34053$Sp5.19612@text.news.virginmedia.com>

TechieInsights wrote:
> On Feb 12, 9:03 am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
>>
>> Thanks.
> 
> if i % 3  == 0 or i % 5 == 0
> 

Yea, new it would be embarrasing, thanks!


From google at mrabarnett.plus.com  Thu Feb 12 11:12:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 16:12:11 +0000
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
	<4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>
Message-ID: <49944A5B.8070307@mrabarnett.plus.com>

Mensanator wrote:
> On Feb 11, 10:58?pm, Jason <elgrandchig... at gmail.com> wrote:
>> Hey everyone--
>>
>> I'm pretty new to Python, & I need to do something that's incredibly
>> simple, but combing my Python Cookbook & googling hasn't helped me out
>> too much yet, and my brain is very, very tired & flaccid @ the
>> moment....
>>
>> I have a list of objects, simply called "list". ?I need to break it
>> into an array (list of lists) wherein each sublist is the length of
>> the variable "items_per_page". ?So array[0] would go from array[0][0]
>> to array[0][items_per_page], then bump up to array[1][0] - array[1]
>> [items_per_page], until all the items in the original list were
>> accounted for.
>>
>> What would be the simplest way to do this in Python? ?And yes, I
>> realize I should probably be taking Programming 101.....
> 
>>>> items_per_page = 20
>>>> x = range(113)
>>>> layout = divmod(113,20)
>>>> if layout[1]>0:
> 	pages = layout[0]+1
> else:
> 	pages = layout[0]
>>>> array = [ x[i*items_per_page:i*items_per_page+items_per_page]  for i in xrange(pages)]
>>>> array
> [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
> 19], [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
> 36, 37, 38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
> 53, 54, 55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
> 70, 71, 72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86,
> 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102,
> 103, 104, 105, 106, 107, 108, 109, 110, 111, 112]]
 >
Using list comprehension:

 >>> my_list = range(113)
 >>> items_per_page = 20
 >>>
 >>> array = [my_list[start : start + items_per_page] for start in 
range(0, len(my_list), items_per_page)]
 >>>
 >>> array
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19], 
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 
38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 
55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 
72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86, 87, 88, 
89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102, 103, 104, 
105, 106, 107, 108, 109, 110, 111, 112]]
 >>>


From bearophileHUGS at lycos.com  Thu Feb 12 11:14:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 12 Feb 2009 08:14:22 -0800 (PST)
Subject: An executable operational semantics for Python
References: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>
Message-ID: <b11993c2-b37d-4cb0-9e2c-018c70532671@t3g2000yqa.googlegroups.com>

gideon:
> I've recently finished my Master's thesis on the semantics of Python.
> In my thesis I define the semantics of Python by rewriting an abstract
> machine. The sources that are used to produce my thesis can also be
> compiled into a working interpreter. Hence I call it an 'executable'
> semantics.

Can it be used for some useful purpose?

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu Feb 12 11:16:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 12 Feb 2009 08:16:42 -0800 (PST)
Subject: Another optimization request :-)
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <080baa3d-0bbf-4d46-8142-5401ec206395@l16g2000yqo.googlegroups.com>

On Feb 12, 2:48?am, jeffg <jeffgem... at gmail.com> wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.

You can start creating a compiled Python extension using ShedSkin, it
may be enough.

Bye,
bearophile


From michele.simionato at gmail.com  Thu Feb 12 11:19:39 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 12 Feb 2009 08:19:39 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
Message-ID: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>

On Feb 12, 5:07?pm, TechieInsights <GDoerm... at gmail.com> wrote:
> On Feb 12, 9:03?am, Catherine Heathcote
>
> <catherine.heathc... at gmail.com> wrote:
> > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > trying to do something simple, the python equivilent of:
>
> > if(i % 3 == 0 || i % 5 == 0)
>
> > Thanks.
>
> in 2.5 and above you can do
> if any(i%3 == 0, i%5 == 0)

You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
the idiomatic solution is to use or).


From catherine.heathcote at gmail.com  Thu Feb 12 11:20:03 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:20:03 GMT
Subject: Embarrasing questio
In-Reply-To: <gn1ho7$ckj$1@panix3.panix.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<gn1ho7$ckj$1@panix3.panix.com>
Message-ID: <T_Xkl.34055$Sp5.14840@text.news.virginmedia.com>

Aahz wrote:
> In article <ZKXkl.34048$Sp5.7221 at text.news.virginmedia.com>,
> Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
> 
> if i % 3 == 0 or i % 5 == 0:
> 
> You may find it worthwhile to quickly step through everything in the
> standard Python tutorial, it covers lots of stuff like this.

I did, though perhapse a little to quickly! lol


From srikrishnamohan at gmail.com  Thu Feb 12 11:24:02 2009
From: srikrishnamohan at gmail.com (km)
Date: Fri, 13 Feb 2009 01:24:02 +0900
Subject: Embarrasing questio
In-Reply-To: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>

Hi,

you could do it this way also :

if i in [3,5]:
    do something...

KM
~~~~~~~~~~~~~~~~~~~~~
On Fri, Feb 13, 2009 at 1:19 AM, Michele Simionato <
michele.simionato at gmail.com> wrote:

> On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
> > On Feb 12, 9:03 am, Catherine Heathcote
> >
> > <catherine.heathc... at gmail.com> wrote:
> > > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > > trying to do something simple, the python equivilent of:
> >
> > > if(i % 3 == 0 || i % 5 == 0)
> >
> > > Thanks.
> >
> > in 2.5 and above you can do
> > if any(i%3 == 0, i%5 == 0)
>
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
An HTML attachment was scrubbed...
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From dear.jay.logan at gmail.com  Thu Feb 12 11:27:09 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 08:27:09 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com>
Message-ID: <a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com>

On Feb 12, 10:58?am, TechieInsights <GDoerm... at gmail.com> wrote:
> Oh... one other thing that would be really cool is to do this with AOP/
> descriptors! ?I just haven't been able to get that to work either.
> Basics...
>
> @readonly
> class MyClass(object):
> ? ? ? ? def __init__(self, x):
> ? ? ? ? ? ? ? ? self.set_x(x)
>
> ? ? ? ? def get_x(self):
> ? ? ? ? ? ? ? ? return self.__x
>
> ? ? ? ? def set_x(self, x):
> ? ? ? ? ? ? ? ? print 'Hello the setter was called!'
> ? ? ? ? ? ? ? ? self.__x = x
>
> and it's done! ?I don't think this will work because (maybe I'm wrong)
> but I don't think you can set the metaclass in the descriptor??? ?If
> this is the case, it is more work to do the AOP and set a metaclass...
> better to just inherit. ?If it can be done... that would be awesome!
>
> Greg

Are your needs not already satisfied by the Python built-in property?

http://docs.python.org/dev/3.0/library/functions.html#property


From digitig at gmail.com  Thu Feb 12 11:28:35 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 12 Feb 2009 16:28:35 +0000
Subject: Embarrasing questio
In-Reply-To: <f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
	<f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>
Message-ID: <aee48b3c0902120828s4189ccb3t4737d2ee4a8a8179@mail.gmail.com>

2009/2/12 km <srikrishnamohan at gmail.com>:
> Hi,
>
> you could do it this way also :
>
> if i in [3,5]:
>     do something...

True, you could do it, but it would be wrong. The original is true for
i = 6, 9, 10, 12 and so on, but yours doesn't seem to be...

-- 
Tim Rowe


From GDoermann at gmail.com  Thu Feb 12 11:30:00 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:30:00 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com> 
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <0c5dfe48-8625-4aca-b126-7c7b4f70f123@r41g2000prr.googlegroups.com>

On Feb 12, 9:19?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 12, 5:07?pm, TechieInsights <GDoerm... at gmail.com> wrote:
>
> > On Feb 12, 9:03?am, Catherine Heathcote
>
> > <catherine.heathc... at gmail.com> wrote:
> > > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > > trying to do something simple, the python equivilent of:
>
> > > if(i % 3 == 0 || i % 5 == 0)
>
> > > Thanks.
>
> > in 2.5 and above you can do
> > if any(i%3 == 0, i%5 == 0)
>
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).

Thanks... my mistake


From GDoermann at gmail.com  Thu Feb 12 11:32:37 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:32:37 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com>
Message-ID: <7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com>

On Feb 12, 9:27?am, josh logan <dear.jay.lo... at gmail.com> wrote:
> On Feb 12, 10:58?am, TechieInsights <GDoerm... at gmail.com> wrote:
>
>
>
> > Oh... one other thing that would be really cool is to do this with AOP/
> > descriptors! ?I just haven't been able to get that to work either.
> > Basics...
>
> > @readonly
> > class MyClass(object):
> > ? ? ? ? def __init__(self, x):
> > ? ? ? ? ? ? ? ? self.set_x(x)
>
> > ? ? ? ? def get_x(self):
> > ? ? ? ? ? ? ? ? return self.__x
>
> > ? ? ? ? def set_x(self, x):
> > ? ? ? ? ? ? ? ? print 'Hello the setter was called!'
> > ? ? ? ? ? ? ? ? self.__x = x
>
> > and it's done! ?I don't think this will work because (maybe I'm wrong)
> > but I don't think you can set the metaclass in the descriptor??? ?If
> > this is the case, it is more work to do the AOP and set a metaclass...
> > better to just inherit. ?If it can be done... that would be awesome!
>
> > Greg
>
> Are your needs not already satisfied by the Python built-in property?
>
> http://docs.python.org/dev/3.0/library/functions.html#property

yea... just read the docs... I love reinventing the wheel (sarcasm)...

Thanks for this... I just realized that you can set the fset and fdel
to None... so everything can be done from the metaclass!


From kyosohma at gmail.com  Thu Feb 12 11:36:32 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 12 Feb 2009 08:36:32 -0800 (PST)
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de> 
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
Message-ID: <4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>

On Feb 12, 8:57?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> Diez B. Roggisch wrote:
> > W. eWatson wrote:
>
> >> It appears if one moves between IDLE and pythonWin (pyWin) that two
> >> separate loops (threads?) can occur, and that IDLE can produce incorrect
> >> results. Since I have preferred IDLE over pyWin, that leaves me currently
> >> in a quandry. How do I renew these processes, so that I can proceed with
> >> IDLE?
>
> >> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
> >> some understanding of what was going on. Killing these tasks didn't help
> >> restore order to IDLE. It seems my only choice now is to reboot? Comments?
>
> > Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
> > processes, including of course the main programs. Which *should* be
> > anything that is needed anyway.
>
> Done that. Been there. It doesn't work. If I take another py tkinter program
> and run it in IDLE, it *will work*. The current program goes boom.
>
> > And you still seem to not understand what is really happening.
>
> Whether I understand it exactly or not is not the issue. The issue is how do
> I execute IDLE *now* to get the correct results it once allowed? The fact of
> the matter is that I was happily working in IDLE for days and hours. I
> encountered a problem in IDLE that seemed suspicious, so I then fired up
> pyWin to see if it gave the same results. It worked fine. Then my problems
> with IDLE got worse.
>
> > Working between pywin and idle is perfectly fine, they are separate
> > programs. You can start as many instances of a program as you want and
> > happily work with them. Even several instances of idle and pywin, unless
> > these come with some logic to prevent multiple starts ?- some windows app
> > do that.
>
> How could this be true; otherwise, ?I wouldn't be complaining?
>
> > What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> > *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> > pyhton-file your app is in. That's all that there is to it.
>
> Personally, I like running entirely in IDLE.
>
> If there is no other way than you suggested in "NOT work", then I may just
> uninstall pyWin.
>
>
>
> > Diez
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

I like IDLE too. However, I've experienced seemingly random crashes
when programming wxPython programs in it. As already stated, the
mainloops clash from time to time. So now I use Wingware or just edit
the files in IDLE and run the program by double-click or via command
line.

Mike


From google at mrabarnett.plus.com  Thu Feb 12 11:37:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 16:37:10 +0000
Subject: Match items in large list
In-Reply-To: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <49945036.70309@mrabarnett.plus.com>

Fisherking wrote:
> Hi,
> 
> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)
> 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!
> 
> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )
> 
> In the second part of this program I need to take each of these items
> (similar items are treated as one) and find these in a database that
> contains 2.5M posts!
> 
> The python version I am bound to is Python 2.3
> 
The best way of looking for duplicates is to make a dict or set of the
items. Unfortunately a dict isn't hashable, so it can't be a key.
Therefore I suggest you convert the dicts into tuples, which are
hashable:

counts = {}
for d in my_list:
     d_as_list = d.items()
     # Standardise the order so that identical dicts become identical 
tuples.
     d_as_list.sort()
     key = tuple(d_as_list)
     if key in counts:
         counts[key] += 1
     else:
         counts[key] = 1


From notvalid2 at sbcglobal.net  Thu Feb 12 11:44:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 08:44:56 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <6viv4bFk8gonU1@mid.uni-berlin.de>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<6viv4bFk8gonU1@mid.uni-berlin.de>
Message-ID: <DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>

I simply ask, "How do I get around the problem?"

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Thu Feb 12 11:50:14 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 08:50:14 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
Message-ID: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>

As with Diez, I simply ask, "How do I get around the problem?" Are you two 
telling me that it is impossible?

OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and have 
  good familiarity with Tkinter? If so, I'll send you the code and you can 
try it yourself. My guess is that it will work, and if not, and you are 
sufficiently skilled with Tkinter and debugging, you may find the problem in 
the code. The steps to create the problem are very easy.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jfabiani at yolo.com  Thu Feb 12 11:55:28 2009
From: jfabiani at yolo.com (John Fabiani)
Date: Thu, 12 Feb 2009 08:55:28 -0800
Subject: openOffic, windows, and Python 2.5
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
	<mailman.9360.1234388663.3487.python-list@python.org>
Message-ID: <suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>

Terry Reedy wrote:

> John Fabiani wrote:
>> Hi,
>> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).
> 
> I presume because no one has volunteered to do the update for the Py-UNO
> bridge.  In any case, why do you consider that to be a problem.  It is
> common for apps to include the Python they are known to work with.
> 
> tjr

Thanks for the response.  The reason is the others apps are written in
python 2.5.x.  All the testing was done on Linux using 2.5 and now we need
it to work on the windows side too.  


From n.kottiyath at gmail.com  Thu Feb 12 11:55:58 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Thu, 12 Feb 2009 08:55:58 -0800 (PST)
Subject: Spam
Message-ID: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>

Hi,
   There seems to be lot of spam coming in this newsgroup.
   Is it possible to have some mechanism similar to say - slashdot -
wherein mails can be moderated by any of the usual users?
   This is required only for people who is posting for the first time
(or people who has been rated spam before). Second post onwards, no
moderation required.
    Just wondering.



From notvalid2 at sbcglobal.net  Thu Feb 12 12:01:19 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 09:01:19 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <%AYkl.16675$yr3.11280@nlpi068.nbdc.sbc.com>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?
> 
> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.
> 
Well, this may be a bit trickier than I thought. I'd have to give you the 
same PIL, tkinter, numpy libraries the program users. However, I"m willing 
to send the files for them to you. Here's the start of the code

=====================
from Tkinter import *
from numpy import *
import Image
import ImageChops
import ImageTk
import ImageDraw # wtw
import time
import binascii
import tkMessageBox
import tkSimpleDialog
from pylab import plot, xlabel, ylabel, title, show, xticks, bar

from tkFileDialog import asksaveasfilename, asksaveasfile
from tkFileDialog import askopenfilename

import MakeQTE
=======================
You'd also need clut.txt, wagon.gif, and MakQTE. All small files.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From apt.shansen at gmail.com  Thu Feb 12 12:09:22 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 09:09:22 -0800
Subject: Spam
In-Reply-To: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
Message-ID: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>

>   There seems to be lot of spam coming in this newsgroup.
>   Is it possible to have some mechanism similar to say - slashdot -
> wherein mails can be moderated by any of the usual users?
>   This is required only for people who is posting for the first time
> (or people who has been rated spam before). Second post onwards, no
> moderation required.
>    Just wondering.

C.P.L is an unmoderated newsgroup: so there's no content controls on
posts. I don't think that's possible to change. But I haven't gotten
directly near a newsgroup-as-a-newsgroup in eons, so I may be wrong.

If you subscribe to C.P.L as a mailing list instead of a newsgroup, I
believe most of the spam gets filtered out at the mailing list<->news
group gateway by the Python.org spam filters... At least no spam in my
Gmail spam folder appears to be flagged from this group(at a very
brief glance) so they appear to be doing quite well.

http://mail.python.org/mailman/listinfo/python-list is the list
subscription page.

(C.P.L and python-list are essentially the same thing: things posted
to the list get forwarded to the newsgroup, and vice-versa)

--S


From apt.shansen at gmail.com  Thu Feb 12 12:10:02 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 09:10:02 -0800
Subject: Spam
In-Reply-To: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
Message-ID: <7a9c25c20902120910h560a6bc7qfae73d456a9634e2@mail.gmail.com>

> C.P.L

C.L.P even.

Ahem.

--S


From google at mrabarnett.plus.com  Thu Feb 12 12:22:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 17:22:30 +0000
Subject: Embarrasing questio
In-Reply-To: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <49945AD6.5060400@mrabarnett.plus.com>

Michele Simionato wrote:
> On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
>> On Feb 12, 9:03 am, Catherine Heathcote
>>
>> <catherine.heathc... at gmail.com> wrote:
>>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>>> trying to do something simple, the python equivilent of:
>>> if(i % 3 == 0 || i % 5 == 0)
>>> Thanks.
>> in 2.5 and above you can do
>> if any(i%3 == 0, i%5 == 0)
> 
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).
> 
any() is really only useful with a generator, otherwise you're always
evaluating both conditions, unlike the solution with 'or'.


From python.list at tim.thechases.com  Thu Feb 12 12:23:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 12 Feb 2009 11:23:29 -0600
Subject: Spam
In-Reply-To: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
Message-ID: <49945B11.9030007@tim.thechases.com>

> If you subscribe to C.P.L as a mailing list instead of a
> newsgroup, I believe most of the spam gets filtered out at the
> mailing list<->news group gateway by the Python.org spam
> filters... At least no spam in my Gmail spam folder appears to
> be flagged from this group(at a very brief glance) so they
> appear to be doing quite well.

Allow  me to take this opportunity to thank the folks that *are* 
doing/managing this spam-filtering of the mailing list side of 
things -- the drastic drop in spam (from 6+ months back) is much 
appreciated!

Though I guess this thread does beg the question:  is there a way 
to read the filtered mailing list with a newsreader (via NNTP) 
instead of getting it delivered via email or subjecting oneself 
to the spamminess of c.l.p?  I like some of the "kill-thread" 
types of options I've got on the NNTP side of readers that aren't 
as readily available to me on the email side of things 
(Thunderbird allows for thread-kills in News, but not in email).

-tkc






From tjreedy at udel.edu  Thu Feb 12 12:24:43 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 12:24:43 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>	<mailman.9320.1234344687.3487.python-list@python.org>
	<pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <gn1m0m$60e$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:
> 
>>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>> def fact(n):
>>>>     if n < 0: raise ValueError
>>>>     if n = 0: return 1
>>>>     return fact(n-1)*n
>>>>
>>>> At the risk of premature optimization, I wonder if there is an idiom
>>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>>> recursive calls?
>> Reverse the test order
>>
>> def fact(n):
>>      if n > 0: return fact(n-1)*n
>>      if n == 0: return 1
>>      raise ValueError
>>
>> You must test recursive versus terminal case every call in any case.
>> Nearly always, the first test passes and second is not done. You only
>> test n==0 once, either to terminate or raise exception. This works for
>> any integral value and catches non-integral values. (There is some delay
>> for that, but only bad calls are penalized.)
> 
> Nice try, but in fact no.

I meant non-integral numbers.  Others inputs are outside the usual spec 
for fact().  You asked about "an idiom for avoiding the unnecessary test 
for n <= 0 in the subsequent recursive calls?" and I gave you that.  You 
should have thanked me.

>>>> fact(None)  # works okay
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 4, in fact
> ValueError
>>>> fact({})
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 2, in fact
> TypeError: unsupported operand type(s) for -: 'dict' and 'int'
> 
> You're relying on arbitrary ordering of types in Python 2.x,

No I'm not.  I don't even know what you mean by that claim.

> and of course in Python 3 that fails altogether.

In 3.0, which is what I use, the comparison 'n>0' raises an exception 
for non-numbers, as it should.  To me, that is success.  What else would 
you want?

Terry Jan Reedy



From travis+ml-python at subspacefield.org  Thu Feb 12 12:26:19 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 12 Feb 2009 11:26:19 -0600
Subject: zlib interface semi-broken
In-Reply-To: <20090210205739.GT6522@subspacefield.org>
References: <20090210205739.GT6522@subspacefield.org>
Message-ID: <20090212172619.GG6522@subspacefield.org>

So I've submitted a patch to bugs.python.org to add a new member
called is_finished to the zlib decompression object.

Issue 5210, file 13056, msg 81780
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From GDoermann at gmail.com  Thu Feb 12 12:27:07 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 09:27:07 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com> 
	<7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com>
Message-ID: <6531a55c-194d-432c-acc4-612700abf935@w24g2000prd.googlegroups.com>

Ok... for some closure I have written a class to automate the
process.  It takes getters and setters and deleters and then sets the
property automatically.  Sweet!


class AutoProperty(type):
	def __new__(cls, name, bases, methoddict):
		processed = []
		getter = 'get_'
		setter = 'set_'
		deleter = 'del_'

		starters = {getter:PropertyAttr(getter, PropertyAttr.FGET),
					setter:PropertyAttr(setter, PropertyAttr.FSET),
					deleter:PropertyAttr(deleter, PropertyAttr.FDEL)
					}
		for key, value in methoddict.items():
			var = None
			for start in starters.keys():
				if key.startswith(start):
					var = key[len(start):]
					break
			if var is None or var in processed:
				continue
			property_values = []

			for start in starters.keys():
				if '%s%s' %(start, var) in methoddict.keys():
					property_values.append(starters[start].tostring(var))
				else:
					property_values.append(starters[start].tostring(None))
			property_map = 'methoddict["%s"] = property(%s)' %(var, ','.join
(property_values))
			exec(property_map)
		return type.__new__(cls, name, bases, methoddict)

class PropertyAttr(object):
	FGET = 'fget'
	FSET = 'fset'
	FDEL = 'fdel'
	def __init__(self, start, type = FGET):
		self.start = start
		self.type = type

	def tostring(self, var):
		if self.type == self.FSET:
			vars = ['v']
		else:
			vars = []
		fullvar = ['self'] + vars
		if var is None:
			return '%s=None' %(self.type)
		return '%s=lambda %s: self.%s%s(%s)' %(self.type, ','.join(fullvar),
self.start, var, ','.join(vars))

class ReadOnly(object):
	__metaclass__ = AutoProperty


class MyClass(ReadOnly):
	def __init__(self, x, y):
		self.__x = x
		self.__y = y

	def get_x(self):
		return self.__x

	def set_x(self, x):
		self.__x = x

	def get_y(self):
		return self.__y

mc = MyClass(10, 100)
print mc.x, mc.y
mc.x = 10
print mc.x
try:
	mc.y = 100
except AttributeError:
	print 'Yea it worked!'

try:
	del mc.y
except AttributeError:
	print "It's read only!"

And the output:
10 100
10
Yea it worked!
It's read only!


Now to work on descriptors doing it for you.


From GDoermann at gmail.com  Thu Feb 12 12:30:30 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 09:30:30 -0800 (PST)
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com> 
	<mailman.9412.1234459418.3487.python-list@python.org>
Message-ID: <b6faf0e8-bd5d-4d15-9b45-20f0a2bf57cc@r15g2000prd.googlegroups.com>

On Feb 12, 10:23?am, Tim Chase <python.l... at tim.thechases.com> wrote:
> > If you subscribe to C.P.L as a mailing list instead of a
> > newsgroup, I believe most of the spam gets filtered out at the
> > mailing list<->news group gateway by the Python.org spam
> > filters... At least no spam in my Gmail spam folder appears to
> > be flagged from this group(at a very brief glance) so they
> > appear to be doing quite well.
>
> Allow ?me to take this opportunity to thank the folks that *are*
> doing/managing this spam-filtering of the mailing list side of
> things -- the drastic drop in spam (from 6+ months back) is much
> appreciated!
>
> Though I guess this thread does beg the question: ?is there a way
> to read the filtered mailing list with a newsreader (via NNTP)
> instead of getting it delivered via email or subjecting oneself
> to the spamminess of c.l.p? ?I like some of the "kill-thread"
> types of options I've got on the NNTP side of readers that aren't
> as readily available to me on the email side of things
> (Thunderbird allows for thread-kills in News, but not in email).
>
> -tkc

Enhancement request for google: hide messages by a certain author

it would be individually set, but can get rid of a lot of junk at
once.


From tjreedy at udel.edu  Thu Feb 12 12:36:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 12:36:20 -0500
Subject: Match items in large list
In-Reply-To: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <gn1mmg$8mv$1@ger.gmane.org>

Fisherking wrote:
> Hi,
> 
> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)
> 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!

Popping items out of the middle of a list is a slow O(n) operation.
MRAB's set of tuples is what I would have suggested.

> 
> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )
> 
> In the second part of this program I need to take each of these items
> (similar items are treated as one) and find these in a database that
> contains 2.5M posts!
> 
> The python version I am bound to is Python 2.3

For that, dict of tuples (with fake value == None) might be faster than 
the add-on set module.



From travis+ml-python at subspacefield.org  Thu Feb 12 12:38:12 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 12 Feb 2009 11:38:12 -0600
Subject: how to distribute python extensions independently of python
Message-ID: <20090212173812.GH6522@subspacefield.org>

So,

Recently I made a fix to the zlib module that I need for use at work.

I would like other employees to be able to use it without recompiling python.

I assume I can just rename it and distribute it as a python extension.

I was wondering how I can provide a way for other employees to build it.

I saw a "Universal Unix Makefile for Python extensions" that looks promising.

Is this the accepted way to compile python extensions still?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From deets at nospam.web.de  Thu Feb 12 12:38:19 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 18:38:19 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <6vj54bFjd14jU1@mid.uni-berlin.de>

W. eWatson wrote:

> As with Diez, I simply ask, "How do I get around the problem?" Are you two
> telling me that it is impossible?

YES. That's what we and all the others who answered to you in the other
thread are telling you, repeatedly. It is impossible. Really. No kidding.
For sure. Jawoll, ganz sicher sogar.

Diez


From andrew at acooke.org  Thu Feb 12 12:42:15 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 14:42:15 -0300 (CLST)
Subject: Spam
In-Reply-To: <49945B11.9030007@tim.thechases.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
Message-ID: <15b8ac796d4482926d373b153409383c.squirrel@localhost>


A quick search on "imap nntp" turned up this list that might be useful -
http://deflexion.com/messaging/ although I wonder when it was written
because I remember using Aaron's RSS to email aggregator when RSS was
new(!).

It mentions gmane, though, which certainly still exists (I assume it
carries this list too).  And this page suggests you can read gmane via
nntp - http://reticule.gmane.org/

Aha!  yes!  It;s in the FAQ :o)

  Can I read news via secure NNTP (nntps)?
  Yes. Point your news reader towards nntps://snews.gmane.org/.

http://www.gmane.org/faq.php

I should be working; I will try that this evening.  What was the name of
the client that threaded messages with a cute ascii tree?!

Cheers,
Andrew


Tim Chase wrote:
> Though I guess this thread does beg the question:  is there a way
> to read the filtered mailing list with a newsreader (via NNTP)




From michele.simionato at gmail.com  Thu Feb 12 12:44:26 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 12 Feb 2009 09:44:26 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com> 
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com> 
	<mailman.9411.1234459347.3487.python-list@python.org>
Message-ID: <589cecad-6edd-4a9f-ae84-0791b37d292a@m42g2000yqb.googlegroups.com>

On Feb 12, 6:22?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Michele Simionato wrote:
> > On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
> >> On Feb 12, 9:03 am, Catherine Heathcote
>
> >> <catherine.heathc... at gmail.com> wrote:
> >>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> >>> trying to do something simple, the python equivilent of:
> >>> if(i % 3 == 0 || i % 5 == 0)
> >>> Thanks.
> >> in 2.5 and above you can do
> >> if any(i%3 == 0, i%5 == 0)
>
> > You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> > the idiomatic solution is to use or).
>
> any() is really only useful with a generator, otherwise you're always
> evaluating both conditions, unlike the solution with 'or'.

Indeed.


From andrew at acooke.org  Thu Feb 12 12:45:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 14:45:33 -0300 (CLST)
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <ea16a4820bbc415f36a51a2b6d371745.squirrel@localhost>


You might want to read
https://www.dfwpython.org/repo/Presentations/2008-10-04-PyArkansas-PythonEggsIntro/eggs-introduction.pdf

It covers a lot of ground; I used it to work out how to distribute a pure
Python package, but I am sure it mentions compiled packages too.  In my
case I ended up using setuptools (easy_install) and distutils.

(Not sure if you asking just about compiling, or more general packaging,
but IIRC it covers both).

Andrew


Travis wrote:
> So,
>
> Recently I made a fix to the zlib module that I need for use at work.
>
> I would like other employees to be able to use it without recompiling
> python.
>
> I assume I can just rename it and distribute it as a python extension.
>
> I was wondering how I can provide a way for other employees to build it.
>
> I saw a "Universal Unix Makefile for Python extensions" that looks
> promising.
>
> Is this the accepted way to compile python extensions still?
> --
> Crypto ergo sum.  http://www.subspacefield.org/~travis/
> Do unto other faiths as you would have them do unto yours.
> If you are a spammer, please email john at subspacefield.org to get
> blacklisted.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From Scott.Daniels at Acm.Org  Thu Feb 12 12:51:16 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 12 Feb 2009 09:51:16 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <h8mdnbQXu5KJ_AnUnZ2dnUVZ_heWnZ2d@pdx.net>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?
> 
> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.

They are telling you the truth, and you are replying, "I don't
want to understand, I just want it to work."  They have shown great
forbearance.  The only time I have debugged any Tkinter code in IDLE,
I have start with "python -m idlelib.idle -n" and accepted the fact
that I will see crashes.  The one advantage of my technique is that
I can hand-execute single Tkinter operations and see the results
immediately since I am running piggyback on IDLE's main loop.

Once more, though I'm sure you don't want to hear it:
     Normally IDLE starts as a program running that talks to the user
(idle.py). It starts a separate process that talks to the user interface
over a TCP/IP port and does the things inside the shell (for
example the expression evaluation).  When you use the command
"Shell / Restart Shell," the process that interacts with your program
is wiped out and new process is started (I think, perhaps they simply
flush almost everything and restart).  The reason only one IDLE session
can live at a time is that a TCP/IP communication port has only two
ends.  If you don't kill _all_ of the pythonw processes, something will
go wrong in the initial setting up the parent/child processes.

     Similarly, a GUI is not a library, but a framework.  The GUI itself
is the main program (run after you do some setup) that calls parts of
your program as subroutines.  You have a problem when you use a GUI to
debug another GUI (there can be only _one_ main program).  It does no
good to stomp your foot and proclaim that you want it to work.
Sometimes your code doesn't interfere too badly with IDLE's GUI, so it
looks as if you have gotten away with it.  For example, in-process IDLE
(the "-n" flag) fiddles with the Tkinter environment in an attempt to
reduce the conflict between IDLE's and your program's use of the GUI.

The only solutions I've seen for debugging GUIs involve separated
processes (even more so than IDLE), running on separate machines.
With those, you don't share a keyboard, mouse, or display between
the debugger and the program under test.  Such solutions are available
for a price.  ActiveState, for example, sells one.

The issue in each case is sharing things that the programs have
every right to expect that they "own."  To wit, Display refresh points,
the main program, the keyboard, tcp/ip ports, the mouse.

--Scott David Daniels
Scott.Daniels at Acm.Org


From maksym.kaban at gmail.com  Thu Feb 12 12:53:04 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 09:53:04 -0800 (PST)
Subject: something wrong with isinstance
Message-ID: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>

Hi there.
now i'm a complete newbie for python, and maybe my problem is stupid
but i cannot solve it myself

i have an object of class GeoMap which contains lists with objects of
GeoMapCell (i will not explain what they should do, hope its not
important). Then i want to serialize these objects to json notation.
So i imported json module and as shown in docs for it extended
JSONEncoder class.  Look at the code below

##main module
from worldmap import GeoMap, GeoMapCell

import testdata
import json

class GeoMapEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, GeoMap):
            return None
        return json.JSONEncoder.default(self, obj)

def main():
    print(json.dumps(2 + 5j, cls=ComplexEncoder))

    geomap = testdata.createTestMap()
    print(json.dumps(geomap, cls=GeoMapEncoder))
    pass

if __name__ == '__main__':
    main()

===========

##worldmap module
class GeoMap:
    cells = []
    activerow = 0
    activecol = 0

    def addCell(self, acell):
        if len(self.cells) == 0:
          self.cells.append([])
          self.activerow = 0
        acell.col = self.activerow
        acell.row = self.activecol
        self.cells[self.activerow].append(acell)
        self.activecol += 1

    def addRow(self):
        self.cells.append([])
        self.activerow += 1;
        self.activecol = 0;

class GeoMapCell:
    neighbours = (None, None, None, None, None, None, )
    col = 0
    row = 0

The problem is in here.

class GeoMapEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, GeoMap):  ## <=======   isinstance doesnot
work as i expected
            return None
        return json.JSONEncoder.default(self, obj)

 Though obj is object of GeoMap class, isinstance returns False. Where
was i mistaken. If i shouldn't use isinstance, then what function
would check class of object?

Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
PyScript


From tjreedy at udel.edu  Thu Feb 12 13:00:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 13:00:54 -0500
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <gn1o4i$e6v$1@ger.gmane.org>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?

Try this analogy.  One television, two stubborn kids that want to watch 
different programs.  One has the remote, the other the buttons on the 
TV.  What happens?  How do you make both happy.  Solve that and get rich 
;-).

Even better analogy.  One inbox.  Two people on opposite sides each want 
'first dibs' on each item that drops.  How do you make them both happy, 
especially if they are equally stubborn clones?


> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.

That is a request, not an offer.



From hniksic at xemacs.org  Thu Feb 12 13:02:28 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 12 Feb 2009 19:02:28 +0100
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
	<mailman.9411.1234459347.3487.python-list@python.org>
	<589cecad-6edd-4a9f-ae84-0791b37d292a@m42g2000yqb.googlegroups.com>
Message-ID: <874oyzjzyj.fsf@mulj.homelinux.net>

Michele Simionato <michele.simionato at gmail.com> writes:

> On Feb 12, 6:22?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> Michele Simionato wrote:
>> > On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
>> >> On Feb 12, 9:03 am, Catherine Heathcote
>>
>> >> <catherine.heathc... at gmail.com> wrote:
>> >>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> >>> trying to do something simple, the python equivilent of:
>> >>> if(i % 3 == 0 || i % 5 == 0)
>> >>> Thanks.
>> >> in 2.5 and above you can do
>> >> if any(i%3 == 0, i%5 == 0)
>>
>> > You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
>> > the idiomatic solution is to use or).
>>
>> any() is really only useful with a generator, otherwise you're always
>> evaluating both conditions, unlike the solution with 'or'.
>
> Indeed.

any(f() for f in (lambda: i % 3 == 0, lambda: i % 5 == 0))

:-)


From invalid at invalid  Thu Feb 12 13:06:09 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 12 Feb 2009 12:06:09 -0600
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
Message-ID: <UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>

On 2009-02-12, andrew cooke <andrew at acooke.org> wrote:

>   Can I read news via secure NNTP (nntps)?
>   Yes. Point your news reader towards nntps://snews.gmane.org/.
>
> http://www.gmane.org/faq.php
>
> I should be working; I will try that this evening.  What was the name of
> the client that threaded messages with a cute ascii tree?!

slrn?

-- 
Grant Edwards                   grante             Yow! How's the wife?
                                  at               Is she at home enjoying
                               visi.com            capitalism?


From cosmo_general at yahoo.com  Thu Feb 12 13:11:44 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Thu, 12 Feb 2009 10:11:44 -0800 (PST)
Subject: Help: makefile in Windows
Message-ID: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>

Hi Folks,

I am learning Extending Python, by testing the demo script of
Programming Python. In the book, a makefile for Linux is there, but I
am using Windows currently. I wish somebody would help me to get a
makefile for Windows, my makefile.linux is as below:

PYDIR= c:\Python25
PY = $(PYDIR)

hello.so: hello.c
        gcc hello.c -g -I$(PY)/include -I$(PY) -fpic -share -o
hello.so
clean:
       rm hello.so core



Thanks a lot!


Muddy Colder


From dear.jay.logan at gmail.com  Thu Feb 12 13:11:50 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 10:11:50 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com> 
	<7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com> 
	<6531a55c-194d-432c-acc4-612700abf935@w24g2000prd.googlegroups.com>
Message-ID: <b2c1ca74-8d2e-457d-95a2-5f69e5d3b499@s20g2000yqh.googlegroups.com>

On Feb 12, 12:27?pm, TechieInsights <GDoerm... at gmail.com> wrote:
> Ok... for some closure I have written a class to automate the
> process. ?It takes getters and setters and deleters and then sets the
> property automatically. ?Sweet!
>
> class AutoProperty(type):
> ? ? ? ? def __new__(cls, name, bases, methoddict):
> ? ? ? ? ? ? ? ? processed = []
> ? ? ? ? ? ? ? ? getter = 'get_'
> ? ? ? ? ? ? ? ? setter = 'set_'
> ? ? ? ? ? ? ? ? deleter = 'del_'
>
> ? ? ? ? ? ? ? ? starters = {getter:PropertyAttr(getter, PropertyAttr.FGET),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? setter:PropertyAttr(setter, PropertyAttr.FSET),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? deleter:PropertyAttr(deleter, PropertyAttr.FDEL)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? }
> ? ? ? ? ? ? ? ? for key, value in methoddict.items():
> ? ? ? ? ? ? ? ? ? ? ? ? var = None
> ? ? ? ? ? ? ? ? ? ? ? ? for start in starters.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? if key.startswith(start):
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? var = key[len(start):]
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? ? ? ? ? ? ? if var is None or var in processed:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? continue
> ? ? ? ? ? ? ? ? ? ? ? ? property_values = []
>
> ? ? ? ? ? ? ? ? ? ? ? ? for start in starters.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? if '%s%s' %(start, var) in methoddict.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? property_values.append(starters[start].tostring(var))
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? property_values.append(starters[start].tostring(None))
> ? ? ? ? ? ? ? ? ? ? ? ? property_map = 'methoddict["%s"] = property(%s)' %(var, ','.join
> (property_values))
> ? ? ? ? ? ? ? ? ? ? ? ? exec(property_map)
> ? ? ? ? ? ? ? ? return type.__new__(cls, name, bases, methoddict)
>
> class PropertyAttr(object):
> ? ? ? ? FGET = 'fget'
> ? ? ? ? FSET = 'fset'
> ? ? ? ? FDEL = 'fdel'
> ? ? ? ? def __init__(self, start, type = FGET):
> ? ? ? ? ? ? ? ? self.start = start
> ? ? ? ? ? ? ? ? self.type = type
>
> ? ? ? ? def tostring(self, var):
> ? ? ? ? ? ? ? ? if self.type == self.FSET:
> ? ? ? ? ? ? ? ? ? ? ? ? vars = ['v']
> ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? vars = []
> ? ? ? ? ? ? ? ? fullvar = ['self'] + vars
> ? ? ? ? ? ? ? ? if var is None:
> ? ? ? ? ? ? ? ? ? ? ? ? return '%s=None' %(self.type)
> ? ? ? ? ? ? ? ? return '%s=lambda %s: self.%s%s(%s)' %(self.type, ','.join(fullvar),
> self.start, var, ','.join(vars))
>
> class ReadOnly(object):
> ? ? ? ? __metaclass__ = AutoProperty
>
> class MyClass(ReadOnly):
> ? ? ? ? def __init__(self, x, y):
> ? ? ? ? ? ? ? ? self.__x = x
> ? ? ? ? ? ? ? ? self.__y = y
>
> ? ? ? ? def get_x(self):
> ? ? ? ? ? ? ? ? return self.__x
>
> ? ? ? ? def set_x(self, x):
> ? ? ? ? ? ? ? ? self.__x = x
>
> ? ? ? ? def get_y(self):
> ? ? ? ? ? ? ? ? return self.__y
>
> mc = MyClass(10, 100)
> print mc.x, mc.y
> mc.x = 10
> print mc.x
> try:
> ? ? ? ? mc.y = 100
> except AttributeError:
> ? ? ? ? print 'Yea it worked!'
>
> try:
> ? ? ? ? del mc.y
> except AttributeError:
> ? ? ? ? print "It's read only!"
>
> And the output:
> 10 100
> 10
> Yea it worked!
> It's read only!
>
> Now to work on descriptors doing it for you.

I think I'll stick with the built-in, Thanks :)


From andrew at acooke.org  Thu Feb 12 13:14:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 15:14:33 -0300 (CLST)
Subject: Spam
In-Reply-To: <UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
	<UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
Message-ID: <032621e9f3f550d0b980acb9d9cfa40e.squirrel@localhost>

Grant Edwards wrote:
>> I should be working; I will try that this evening.  What was the name of
>> the client that threaded messages with a cute ascii tree?!
>
> slrn?

i think i was remembering trn, which is now apparently dead.  will try
slrn...  thanks, andrew




From ptmcg at austin.rr.com  Thu Feb 12 13:14:36 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 12 Feb 2009 10:14:36 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com>

On Feb 12, 11:53?am, maksym.ka... at gmail.com wrote:
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
>
> i have an object of class GeoMap which contains lists with objects of
> GeoMapCell (i will not explain what they should do, hope its not
> important). Then i want to serialize these objects to json notation.
> So i imported json module and as shown in docs for it extended
> JSONEncoder class. ?Look at the code below
>
> ##main module
> from worldmap import GeoMap, GeoMapCell
>
> import testdata
> import json
>
> class GeoMapEncoder(json.JSONEncoder):
> ? ? def default(self, obj):
> ? ? ? ? if isinstance(obj, GeoMap):
> ? ? ? ? ? ? return None
> ? ? ? ? return json.JSONEncoder.default(self, obj)
>
> def main():
> ? ? print(json.dumps(2 + 5j, cls=ComplexEncoder))
>
> ? ? geomap = testdata.createTestMap()
> ? ? print(json.dumps(geomap, cls=GeoMapEncoder))
> ? ? pass
>
> if __name__ == '__main__':
> ? ? main()
>
> ===========
>
> ##worldmap module
> class GeoMap:
> ? ? cells = []
> ? ? activerow = 0
> ? ? activecol = 0
>
> ? ? def addCell(self, acell):
> ? ? ? ? if len(self.cells) == 0:
> ? ? ? ? ? self.cells.append([])
> ? ? ? ? ? self.activerow = 0
> ? ? ? ? acell.col = self.activerow
> ? ? ? ? acell.row = self.activecol
> ? ? ? ? self.cells[self.activerow].append(acell)
> ? ? ? ? self.activecol += 1
>
> ? ? def addRow(self):
> ? ? ? ? self.cells.append([])
> ? ? ? ? self.activerow += 1;
> ? ? ? ? self.activecol = 0;
>
> class GeoMapCell:
> ? ? neighbours = (None, None, None, None, None, None, )
> ? ? col = 0
> ? ? row = 0
>
> The problem is in here.
>
> class GeoMapEncoder(json.JSONEncoder):
> ? ? def default(self, obj):
> ? ? ? ? if isinstance(obj, GeoMap): ?## <======= ? isinstance doesnot
> work as i expected
> ? ? ? ? ? ? return None
> ? ? ? ? return json.JSONEncoder.default(self, obj)
>
> ?Though obj is object of GeoMap class, isinstance returns False. Where
> was i mistaken. If i shouldn't use isinstance, then what function
> would check class of object?
>
> Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
> PyScript

Here's a crazy idea out of left field.  Just before calling
isinstance, why not try:

print(type(obj))
print(str(obj))

This may illuminate the unexpected behavior, you'll find out just what
obj has in it.

-- Paul


From aahz at pythoncraft.com  Thu Feb 12 13:25:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 Feb 2009 10:25:38 -0800
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
	<UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
	<mailman.9420.1234462487.3487.python-list@python.org>
Message-ID: <gn1pj2$5pn$1@panix3.panix.com>

In article <mailman.9420.1234462487.3487.python-list at python.org>,
andrew cooke <andrew at acooke.org> wrote:
>Grant Edwards wrote:
>>> I should be working; I will try that this evening.  What was the name of
>>> the client that threaded messages with a cute ascii tree?!
>>
>> slrn?
>
>i think i was remembering trn, which is now apparently dead.  will try
>slrn...  thanks, andrew

trn 3.6 works fine for me ... just as it has for almost twenty years.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From maksym.kaban at gmail.com  Thu Feb 12 13:26:14 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 10:26:14 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com>
Message-ID: <2d88e036-a529-4364-9fcb-e8fe7446827e@g38g2000yqd.googlegroups.com>

> Here's a crazy idea out of left field. ?Just before calling
> isinstance, why not try:
>
> print(type(obj))
> print(str(obj))
>
> This may illuminate the unexpected behavior, you'll find out just what
> obj has in it.
>
> -- Paul

Well the output of
> print(type(obj))
> print(str(obj))

was

<class 'worldmap.GeoMap'>
<worldmap.GeoMap object at 0x01DD17B0>

Just looks well, isn't it? i have no idea what's wrong


From tjreedy at udel.edu  Thu Feb 12 13:48:45 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 13:48:45 -0500
Subject: openOffic, windows, and Python 2.5
In-Reply-To: <suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>	<mailman.9360.1234388663.3487.python-list@python.org>
	<suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>
Message-ID: <gn1qu8$o9p$1@ger.gmane.org>

John Fabiani wrote:
> Terry Reedy wrote:
> 
>> John Fabiani wrote:
>>> Hi,
>>> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).
>> I presume because no one has volunteered to do the update for the Py-UNO
>> bridge.  In any case, why do you consider that to be a problem.  It is
>> common for apps to include the Python they are known to work with.
>>
>> tjr
> 
> Thanks for the response.  The reason is the others apps are written in
> python 2.5.x.  All the testing was done on Linux using 2.5 and now we need
> it to work on the windows side too.  

Have you tried it?  What breaks?  Win OOo's use of 2.3 should only 
affect Python code that you run within the OO process itself, with its 
copy of Python.  Avoiding things introduced in 2.4/2.5 is probably 
easier than recompiling OOo on Windows.



From ivanov.maxim at gmail.com  Thu Feb 12 13:49:52 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 10:49:52 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>

Don't really sure, but try to define your class as new-style one.
Like
class GeoMap(object):
   ...



From maksym.kaban at gmail.com  Thu Feb 12 13:59:03 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 10:59:03 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <b0189430-e2ec-454d-ae21-f8f442dbc03f@d32g2000yqe.googlegroups.com>

On 12 ???, 21:49, redbaron <ivanov.ma... at gmail.com> wrote:
> Don't really sure, but try to define your class as new-style one.
> Like
> class GeoMap(object):
> ? ?...

Sorry, it didn't work


From jura.grozni at gmail.com  Thu Feb 12 14:15:36 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 11:15:36 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
Message-ID: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>

To be honest, in compare to Visual Studio, Gui Builders for wx widgets
are really bad. Also completly for python there is not one good
GuiBuilder. The only one I have seen that would come near VS was
BoaConstructor, But the number of Bugs is just horrific. Too bad that
no one is developing it further.

Do you know if there is any project curently running for GUI builders,
maybe for WX, That I could maybe join.


From benjamin at python.org  Thu Feb 12 14:22:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 12 Feb 2009 19:22:32 +0000 (UTC)
Subject: =?utf-8?b?X19pbXBvcnRfXw==?= Confusion
References: <5e61a9a8-7caa-4dfc-9454-aa8eddb8e593@z1g2000yqn.googlegroups.com>
Message-ID: <loom.20090212T192047-728@post.gmane.org>

 <scott.bronson.nelson <at> gmail.com> writes:

> 
> Can someone explain to me what's going on here?
> 
> >>> __import__('some.package.module', {}, {}, [])
> <module 'some' from 'some/__init__.py'>
> >>> __import__('some.package.module', {}, {}, [''])
> <module 'some.package.module' from 'some/package/module.py'>

As documented [1], unless fromlist is not empty, the first module is returned.
Use the solution at the end of the docs to get around this.


[1] http://docs.python.org/library/functions.html#__import__



From btaylordesign at gmail.com  Thu Feb 12 14:24:05 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 12 Feb 2009 11:24:05 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
References: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>
	<68b98811-6352-4b84-952a-c5e0209e8bd3@x9g2000yqk.googlegroups.com>
Message-ID: <3e91a7f3-53b3-4454-91b6-d1bd00892010@s20g2000yqh.googlegroups.com>

On Feb 12, 9:31?am, redbaron <ivanov.ma... at gmail.com> wrote:
> > ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
> > lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
> > ___divdi3
>
> You didn't link cx_Oracle.so all libs which it use. run "ldd -r
> cx_Oracle.so" and you'll have an idea about all missing symbols. The
> names of missed symbols could give you an idea what else should
> cx_Oracle.so should be linked with

We are getting a "command not found" error for the ldd command in OS X
10.5.6

Please advise.


From james at agentultra.com  Thu Feb 12 14:25:46 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 14:25:46 -0500
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <85fxijh2yt.fsf@agentultra.com>

azrael <jura.grozni at gmail.com> writes:

> To be honest, in compare to Visual Studio, Gui Builders for wx
> widgets are really bad.

That's because Visual Studio is a Microsoft product to build
interfaces for Microsoft products.

wx on the other hand is cross platform and ergo, much more
complicated.

> Do you know if there is any project curently running for GUI
> builders, maybe for WX, That I could maybe join.

You could help wx. Make your own gui builder if you think you could do
better. There's also GTK and Qt... and probably many others.


From krmane at gmail.com  Thu Feb 12 14:34:10 2009
From: krmane at gmail.com (Krishnakant)
Date: Fri, 13 Feb 2009 01:04:10 +0530
Subject: need help from some one who uses python-ooolib
Message-ID: <1234467250.10414.155.camel@kk-laptop>

hello all,
Has any one used python-ooolib to create open office spreadsheets?
I want to know the method of merging cells using the library's calc
class.
happy hacking.
Krishnakant.




From tjreedy at udel.edu  Thu Feb 12 14:34:21 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 14:34:21 -0500
Subject: Spam
In-Reply-To: <15b8ac796d4482926d373b153409383c.squirrel@localhost>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>	<49945B11.9030007@tim.thechases.com>
	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
Message-ID: <gn1tjp$2ah$1@ger.gmane.org>

andrew cooke wrote:
> A quick search on "imap nntp" turned up this list that might be useful -
> http://deflexion.com/messaging/ although I wonder when it was written
> because I remember using Aaron's RSS to email aggregator when RSS was
> new(!).
> 
> It mentions gmane, though, which certainly still exists (I assume it
> carries this list too).

Yes.  For everything possible, I read and post via gmane.  Gmane mirrors 
technical mailing lists.  As near as I can tell, posts via gmane go to 
the mailing list first, for whatever filtering the list does. 
Conversely then, gmane only posts the filtered output from the mailing list.

 >  And this page suggests you can read gmane via
> nntp - http://reticule.gmane.org/

news.gmane.org works fine.

> Aha!  yes!  It;s in the FAQ :o)
> 
>   Can I read news via secure NNTP (nntps)?
>   Yes. Point your news reader towards nntps://snews.gmane.org/.
> 
> http://www.gmane.org/faq.php



From sushiboy21 at gmail.com  Thu Feb 12 14:40:57 2009
From: sushiboy21 at gmail.com (S-boy)
Date: Thu, 12 Feb 2009 11:40:57 -0800 (PST)
Subject: Can't load smtplib
Message-ID: <027b7c9e-3e63-4246-99a4-212fe297a260@l1g2000yqj.googlegroups.com>

I can't seem to import smtplib in either a script or the command line
interpreter.

When I try to import smtp, there seems to be some kind of collision
with urllib2. I get a weird error about Web server authorization, even
though I'm not calling urllib2.

Any ideas on what might be causing this?

Here's the mess....

Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin

>>> import smtplib

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/smtplib.py", line 46, in <module>
    import email.Utils
  File "email.py", line 4, in <module>
    response = urlopen("https://webmail.canwest.com")
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 124, in urlopen
    return _opener.open(url, data)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 387, in open
    response = meth(req, response)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 498, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 425, in error
    return self._call_chain(*args)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 360, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 506, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
authorization to fulfill the request. Access to the Web server is
denied. Contact the server administrator.  )


From stef.mientki at gmail.com  Thu Feb 12 14:41:17 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 12 Feb 2009 20:41:17 +0100
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <49947B5D.4000202@gmail.com>

azrael wrote:
> To be honest, in compare to Visual Studio, Gui Builders for wx widgets
> are really bad. Also completly for python there is not one good
> GuiBuilder. The only one I have seen that would come near VS was
> BoaConstructor, But the number of Bugs is just horrific. Too bad that
> no one is developing it further.
>
> Do you know if there is any project curently running for GUI builders,
> maybe for WX, That I could maybe join.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
Well I come from Delphi, and compared to Delphi, even Visual Studio 
vanishes ;-)
I also tried to start with wxGlad, Boa, XRC ....
... but they were full of bugs, or even couldn't be started.
The best seems to be PyQt, but the license is (still) terrible (and 
maybe only their stories are much better than the real result ;-).
I didn't try XRC, because I found it much too difficult,
but instead I wrote a small program,
making a much easier version of the XRC-idea.
And after a few months,
I don't even notice the difference between Delphi (which I'm still using)
and wxPython.

I think this story happened to other people to,
so instead of putting a lot of effort in designing and maintaining a GUI 
builders,
it might be better to choose another solution.

btw, the idea I used, can be seen here]
http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
and the code can be found here
http://code.google.com/p/pylab-works/downloads/list

cheers,
Stef


From tjreedy at udel.edu  Thu Feb 12 14:42:46 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 14:42:46 -0500
Subject: Spam
In-Reply-To: <gn1tjp$2ah$1@ger.gmane.org>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>	<49945B11.9030007@tim.thechases.com>	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
	<gn1tjp$2ah$1@ger.gmane.org>
Message-ID: <gn1u3g$38f$1@ger.gmane.org>

Terry Reedy wrote:
> andrew cooke wrote:
>> A quick search on "imap nntp" turned up this list that might be useful -
>> http://deflexion.com/messaging/ although I wonder when it was written
>> because I remember using Aaron's RSS to email aggregator when RSS was
>> new(!).
>>
>> It mentions gmane, though, which certainly still exists (I assume it
>> carries this list too).
> 
> Yes.  For everything possible, I read and post via gmane.  Gmane mirrors 
> technical mailing lists.  As near as I can tell, posts via gmane go to 
> the mailing list first, for whatever filtering the list does. Conversely 
> then, gmane only posts the filtered output from the mailing list.
> 
>  >  And this page suggests you can read gmane via
>> nntp - http://reticule.gmane.org/
> 
> news.gmane.org works fine.
> 
>> Aha!  yes!  It;s in the FAQ :o)
>>
>>   Can I read news via secure NNTP (nntps)?
>>   Yes. Point your news reader towards nntps://snews.gmane.org/.
>>
>> http://www.gmane.org/faq.php

I just switched my Thunderbird gmane account to snews... and [x] use ssl 
and it seems to work ok.  It did, however, reset everything to unread.



From exarkun at divmod.com  Thu Feb 12 14:50:42 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 12 Feb 2009 14:50:42 -0500
Subject: Can't load smtplib
In-Reply-To: <027b7c9e-3e63-4246-99a4-212fe297a260@l1g2000yqj.googlegroups.com>
Message-ID: <20090212195042.12853.200194161.divmod.quotient.9312@henry.divmod.com>

On Thu, 12 Feb 2009 11:40:57 -0800 (PST), S-boy <sushiboy21 at gmail.com> wrote:
>I can't seem to import smtplib in either a script or the command line
>interpreter.
>
>When I try to import smtp, there seems to be some kind of collision
>with urllib2. I get a weird error about Web server authorization, even
>though I'm not calling urllib2.
>
>Any ideas on what might be causing this?
>
>Here's the mess....
>
>Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
>[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>
>>>> import smtplib
>
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/smtplib.py", line 46, in <module>
>    import email.Utils
>  File "email.py", line 4, in <module>

Ooops.  Here's your problem.  Notice how that's not /Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/email/?  You have an "email" module that's obscuring the stdlib
email package.

>    response = urlopen("https://webmail.canwest.com")
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 124, in urlopen
>    return _opener.open(url, data)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 387, in open
>    response = meth(req, response)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 498, in http_response
>    'http', request, response, code, msg, hdrs)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 425, in error
>    return self._call_chain(*args)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 360, in _call_chain
>    result = func(*args)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 506, in http_error_default
>    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
>urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
>authorization to fulfill the request. Access to the Web server is
>denied. Contact the server administrator.  )

Jean-Paul


From ptmcg at austin.rr.com  Thu Feb 12 14:56:40 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 12 Feb 2009 11:56:40 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com> 
	<2d88e036-a529-4364-9fcb-e8fe7446827e@g38g2000yqd.googlegroups.com>
Message-ID: <1e02747f-3058-4e9b-b971-e2500da500d2@z1g2000yqn.googlegroups.com>

On Feb 12, 12:26?pm, maksym.ka... at gmail.com wrote:
>
> Well the output of
>
> > print(type(obj))
> > print(str(obj))
>
> was
>
> <class 'worldmap.GeoMap'>
> <worldmap.GeoMap object at 0x01DD17B0>
>
> Just looks well, isn't it? i have no idea what's wrong

So then how do you know isinstance is evaluating to False?  And why do
you return None if it evals to True?  Can you drop a print command
inside the if block just before returning None, and another print just
before returning the default default?

I also would recommend using a debugger like winpdb when in a spot
like this - despite the name, it is not Windows-only, and you can step
through this code and evaluate variables and expressions inline.

-- Paul


From deets at nospam.web.de  Thu Feb 12 14:56:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 20:56:43 +0100
Subject: something wrong with isinstance
In-Reply-To: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <6vjd7rFjdhqrU1@mid.uni-berlin.de>

maksym.kaban at gmail.com schrieb:
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
> 
> i have an object of class GeoMap which contains lists with objects of
> GeoMapCell (i will not explain what they should do, hope its not
> important). Then i want to serialize these objects to json notation.
> So i imported json module and as shown in docs for it extended
> JSONEncoder class.  Look at the code below
> 
> ##main module
> from worldmap import GeoMap, GeoMapCell
> 
> import testdata
> import json
> 
> class GeoMapEncoder(json.JSONEncoder):
>     def default(self, obj):
>         if isinstance(obj, GeoMap):
>             return None
>         return json.JSONEncoder.default(self, obj)
> 
> def main():
>     print(json.dumps(2 + 5j, cls=ComplexEncoder))
> 
>     geomap = testdata.createTestMap()
>     print(json.dumps(geomap, cls=GeoMapEncoder))
>     pass
> 
> if __name__ == '__main__':
>     main()
> 
> ===========
> 
> ##worldmap module
> class GeoMap:
>     cells = []
>     activerow = 0
>     activecol = 0
> 
>     def addCell(self, acell):
>         if len(self.cells) == 0:
>           self.cells.append([])
>           self.activerow = 0
>         acell.col = self.activerow
>         acell.row = self.activecol
>         self.cells[self.activerow].append(acell)
>         self.activecol += 1
> 
>     def addRow(self):
>         self.cells.append([])
>         self.activerow += 1;
>         self.activecol = 0;
> 
> class GeoMapCell:
>     neighbours = (None, None, None, None, None, None, )
>     col = 0
>     row = 0
> 
> The problem is in here.
> 
> class GeoMapEncoder(json.JSONEncoder):
>     def default(self, obj):
>         if isinstance(obj, GeoMap):  ## <=======   isinstance doesnot
> work as i expected
>             return None
>         return json.JSONEncoder.default(self, obj)
> 
>  Though obj is object of GeoMap class, isinstance returns False. Where
> was i mistaken. If i shouldn't use isinstance, then what function
> would check class of object?
> 
> Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
> PyScript


I think you have a common problem here that occurs when using a script 
with more that non-trivial contents as main-script.


What happens is this: you have a

__main__.GeoMap, which is the one tested against in isinstance.

*And* you have a <mainmodule>.GeoMap (replace <mainmodule> with the 
actual name) that is imported & used from the other module.


A simple testscript illustrates the issue:


### test.py ####

class Foo(object):
     pass


if __name__ == "__main__":
    import test
    print Foo == test.Foo


Run it from inside the directory you saved it in.

To work around this issue, simply create a bootstrap-main-module that 
has not much in it.

Diez


From deets at nospam.web.de  Thu Feb 12 14:58:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 20:58:28 +0100
Subject: Capture images in macOS X
In-Reply-To: <mailman.9423.1234463605.3487.python-list@python.org>
References: <mailman.9423.1234463605.3487.python-list@python.org>
Message-ID: <6vjdb4FjdhqrU2@mid.uni-berlin.de>

Jonathan Chac?n schrieb:
> Hello,
> 
> I need to capture images from the macbook webcam in leopard.
> Does anybody know how can I do this?

Use the pyobjc bridge & some ObjectiveC-framework such as 
CocoaSequenceGrabber.

http://www.skyfell.org/cocoasequencegrabber.html

There are similar ones out there.

Diez


From vincent at vincentdavis.net  Thu Feb 12 15:01:32 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 12 Feb 2009 13:01:32 -0700
Subject: Spam
In-Reply-To: <gn1u3g$38f$1@ger.gmane.org>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
	<gn1tjp$2ah$1@ger.gmane.org> <gn1u3g$38f$1@ger.gmane.org>
Message-ID: <77e831100902121201v5820dac8p4f9399fa68a0d332@mail.gmail.com>

I am a little disturbed that there are no moderators,
mostly because I received an email back from the list"Your mail to
'Python-list' with the subject. Above and beyond, critique request. Is being
held until the list moderator can review it for approval. The reason it is
being held: Message body is too big: 41670 bytes with a limit of 40
KB. Either the message will get posted to the list, or you will receive
notification of the moderator's decision.  If you would like to cancel
this posting, please visit the following URL:"

So does this mean it will never actually be reviewed?

Thanks
Vincent Davis



On Thu, Feb 12, 2009 at 12:42 PM, Terry Reedy <tjreedy at udel.edu> wrote:

> Terry Reedy wrote:
>
>> andrew cooke wrote:
>>
>>> A quick search on "imap nntp" turned up this list that might be useful -
>>> http://deflexion.com/messaging/ although I wonder when it was written
>>> because I remember using Aaron's RSS to email aggregator when RSS was
>>> new(!).
>>>
>>> It mentions gmane, though, which certainly still exists (I assume it
>>> carries this list too).
>>>
>>
>> Yes.  For everything possible, I read and post via gmane.  Gmane mirrors
>> technical mailing lists.  As near as I can tell, posts via gmane go to the
>> mailing list first, for whatever filtering the list does. Conversely then,
>> gmane only posts the filtered output from the mailing list.
>>
>>  >  And this page suggests you can read gmane via
>>
>>> nntp - http://reticule.gmane.org/
>>>
>>
>> news.gmane.org works fine.
>>
>>  Aha!  yes!  It;s in the FAQ :o)
>>>
>>>  Can I read news via secure NNTP (nntps)?
>>>  Yes. Point your news reader towards nntps://snews.gmane.org/.
>>>
>>> http://www.gmane.org/faq.php
>>>
>>
> I just switched my Thunderbird gmane account to snews... and [x] use ssl
> and it seems to work ok.  It did, however, reset everything to unread.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From jura.grozni at gmail.com  Thu Feb 12 15:04:55 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:04:55 -0800 (PST)
Subject: A little bit else I would like to discuss
Message-ID: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>

Sometimes I really get confused when looking out for a modul for some
kind of need. Sometimes I get frightened when I get the resaults. 8
wraper for this, 7 wrapers for that, 10 modules for anything. Between
them are maybe some kind of small differences, but to work with any of
the modules, I have to spend 10 hours of reading the help, If there is
any at all.

I think that there should be a list on python.org of supported or
sugested modules for some need. For example Database access. Or GUI
Building. It is a complete pain in the ass. Let's face the true, TK is
out of date. There should be another one used and appended to the
standard Python Library. One that plays well with other platforms. And
if it does't, let's make it play better.

Why will Microsoft's products kick the ass of open source. Because
anyone does what he wants. Let's say There are 5 GUI libraries
competing against each other. Think about it what could these 5 teams
acomplish if they would work together. Or maybe a framework for RAD
GUI devbelopment. after 10 years of python, there is still not one
application for GUI Building that can beat Visual Studio.

Anyone I talk to says: "Oh my god, Python and GUI"

There are a dozen of modules that should be, if you ask me, be
implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
talk to, are using them. But everyone has to download them manually
and hope that if someone is using their code, has also installed the
needed modules.



My solution would be:
Let's make an announcement on Python.org. something like this.

We need Ideas for creating the a standard library in Python for Image
processing. Tell  us your problem. What do you think which feature
should be implemented. Which transformation, which algorithm.
Make a vote. This should be that not.

But how to start something like that. Anyone that sees a problem that
should be solved, becomes the project leader. Find the best Ideas and
make a good library.


It's is very good that people have a choice. But why not make some
standards. I know that there is already a standard python library, But
why not extending it. classify the standard library into subcategories
like Networking, DataBase, Computation, ......



One other thing. I am not looking for war on groups. I just would like
to discuss some things that drive me crazy while using Python.

This group has a lot of members. not to mention every Python Forum.
Why not using this number of people and accomplish something great. If
anyone of us would write 10 line of good code, it would result a very
great and powerfull environment.


From jura.grozni at gmail.com  Thu Feb 12 15:11:41 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:11:41 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
Message-ID: <4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>

On Feb 12, 8:25?pm, J Kenneth King <ja... at agentultra.com> wrote:
> azrael <jura.gro... at gmail.com> writes:
> > To be honest, in compare to Visual Studio, Gui Builders for wx
> > widgets are really bad.
>
> That's because Visual Studio is a Microsoft product to build
> interfaces for Microsoft products.
>
> wx on the other hand is cross platform and ergo, much more
> complicated.
>

I think that WX is really great but there is really a great lack of a
builder.





> > Do you know if there is any project curently running for GUI
> > builders, maybe for WX, That I could maybe join.
>
> You could help wx. Make your own gui builder if you think you could do
> better. There's also GTK and Qt... and probably many others.





I think that this would be a great mistake. Let's sit down and make my
own gui builder. I think That some people should sit together and
discuss what we need to make a good GUI builder. I am in. Who would
like to join me.


From philip at semanchuk.com  Thu Feb 12 15:15:12 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 12 Feb 2009 15:15:12 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>


On Feb 12, 2009, at 3:04 PM, azrael wrote:

> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.

Let me know when Visual Studio tries to address building GUIs for  
Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to  
oranges, or chalk and cheese if you're from that part of the world.





From jura.grozni at gmail.com  Thu Feb 12 15:18:38 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:18:38 -0800 (PST)
Subject: A little bit else I would like to discuss
Message-ID: <98e33cd6-aa9d-4626-9f07-20fe5984bfbb@j38g2000yqa.googlegroups.com>

Sometimes I really get confused when looking out for a modul for some
kind of need. Sometimes I get frightened when I get the resaults. 8
wraper for this, 7 wrapers for that, 10 modules for anything. Between
them are maybe some kind of small differences, but to work with any of
the modules, I have to spend 10 hours of reading the help, If there is
any at all.

I think that there should be a list on python.org of supported or
sugested modules for some need. For example Database access. Or GUI
Building. It is a complete pain in the ass. Let's face the true, TK is
out of date. There should be another one used and appended to the
standard Python Library. One that plays well with other platforms. And
if it does't, let's make it play better.

Why will Microsoft's products kick the ass of open source. Because
anyone does what he wants. Let's say There are 5 GUI libraries
competing against each other. Think about it what could these 5 teams
acomplish if they would work together. Or maybe a framework for RAD
GUI devbelopment. after 10 years of python, there is still not one
application for GUI Building that can beat Visual Studio.

Anyone I talk to says: "Oh my god, Python and GUI"

There are a dozen of modules that should be, if you ask me, be
implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
talk to, are using them. But everyone has to download them manually
and hope that if someone is using their code, has also installed the
needed modules.



My solution would be:
Let's make an announcement on Python.org. something like this.

We need Ideas for creating the a standard library in Python for Image
processing. Tell  us your problem. What do you think which feature
should be implemented. Which transformation, which algorithm.
Make a vote. This should be that not.

But how to start something like that. Anyone that sees a problem that
should be solved, becomes the project leader. Find the best Ideas and
make a good library.


It's is very good that people have a choice. But why not make some
standards. I know that there is already a standard python library, But
why not extending it. classify the standard library into subcategories
like Networking, DataBase, Computation, ......



One other thing. I am not looking for war on groups. I just would like
to discuss some things that drive me crazy while using Python.

This group has a lot of members. not to mention every Python Forum.
Why not using this number of people and accomplish something great. If
anyone of us would write 10 line of good code, it would result a very
great and powerfull environment.


From gervaz at gmail.com  Thu Feb 12 15:20:39 2009
From: gervaz at gmail.com (mattia)
Date: 12 Feb 2009 20:20:39 GMT
Subject: Library similar to UserAgent (perl)
References: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>
	<6vik2dFk1ph9U1@mid.uni-berlin.de>
Message-ID: <49948497$0$1123$4fafbaef@reader2.news.tin.it>

Il Thu, 12 Feb 2009 13:47:09 +0100, Diez B. Roggisch ha scritto:

> mattia wrote:
> 
>> Hi everybody, I'm looking for an easy way to put data in a form, then
>> click the button and follow the redirect. Also I need to use cookies. I
>> read that using perl this can be done using the UserAgent lib, that
>> also provide th browser functionality to let the site believe that you
>> are getting the pages from a normali browser like ff. Any suggestion? I
>> think that the main concen is to easilly put the data in the numerous
>> textlabel provided and then magically simulate the 'click me' button.
> 
> Python mechanize.
> 
> Diez

Thanks a lot.

Mattia


From steve at holdenweb.com  Thu Feb 12 15:22:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 12 Feb 2009 15:22:28 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<mailman.9352.1234385290.3487.python-list@python.org>
	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
Message-ID: <gn20f7$d0e$1@ger.gmane.org>

John Machin wrote:
> On Feb 12, 7:48 am, Stef Mientki <stef.mien... at gmail.com> wrote:
>> Alec Schueler wrote:
>>> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>>>> As there are a whole lot of these lines, in a whole lot of files,
>>>> I wonder if there's a simple trick to point
>>>>   /usr/share/tinybldLin/
>>>> to my directory ?
>>>> thanks,
>>>> Stef
>>> Find and replace?
>> well I was thinking of a more elegant way,
>> so the scripts remains, or better become multi-platform.
> 
> Your current setup is not even single-platform portable ... consider
> the scenario where some Linux admin wants your gear to live in some
> directory other than /usr/share/tinybldLin/
> 
> The standard technique for ensuring that kind of portability involves:
> 1. Find the directory in which your script lives. Inspect sys.argv[0],
> use some os.path.some_functionality() to extract the directory, name
> it (say) home_base.
> 2. When you want to open a data file in the script's directory, do
> this:
>    the_path = os.path.join(home_base, 'stef1.dat')
>    f = open(the_path, .....)
> 
> NOTE: Use os.path.join() instead of some DIY technique; it knows
> better than you what the path separator is on the OS it's being run
> on. In fact, read the whole of the os.path manual carefully before you
> jump in to changing your code.
> 
> If you prefer to have the data files in (say) .../script_locn/data
> instead of .../script_locn, the adjustment should be obvious.
> 
> Unfortunately, you are still going to need use find and replace to fix
> your script. Code in haste, repent at leisure :-)
> 
Of course the real issue here is that the same hard-coded directory name
(or possibly multiple directory names all rooted in the same directory)
are scattered throughout the program. Your (the OP's) first task should
be to store that "root" directory in a variable and then use the
variable in place of all current uses of the root directory.

For example, I have a Django project that I like to run under both
Windows and Cygwin. So in my settings.py file I have:

# Django settings for PyTeach project.
import sys
if sys.platform == 'cygwin':
    fsroot = "/home/sholden"
elif sys.platform  == 'win32':
    fsroot = "C:/Users/sholden/Documents"
else:
    sys.exit("Only configured for Windows and Cygwin")

Than further down I have

# Absolute path to the directory that holds media.
# Example: "/home/media/media.lawrence.com/"
MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'

Note that most Windows APIs allow you to use the forward slash as a
delimiter. It's mostly the command line and Windows Explorer that are
snotty about insisting on the backslash.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mail at timgolden.me.uk  Thu Feb 12 15:24:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 12 Feb 2009 20:24:33 +0000
Subject: A little bit else I would like to discuss
In-Reply-To: <B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
Message-ID: <49948581.6070001@timgolden.me.uk>

Philip Semanchuk wrote:
> 
> On Feb 12, 2009, at 3:04 PM, azrael wrote:
> 
>> Why will Microsoft's products kick the ass of open source. Because
>> anyone does what he wants. Let's say There are 5 GUI libraries
>> competing against each other. Think about it what could these 5 teams
>> acomplish if they would work together. Or maybe a framework for RAD
>> GUI devbelopment. after 10 years of python, there is still not one
>> application for GUI Building that can beat Visual Studio.
> 
> Let me know when Visual Studio tries to address building GUIs for 
> Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to 
> oranges, or chalk and cheese if you're from that part of the world.

While your point is obviously good, it only applies if you
even care about building for OS X, Gnome etc. If all you
want is build on Windows (or Gnome or KDE or whatever) then
the cross-platformness of any proposed toolkit is worthless
and may even be a drawback if it reduces its functionality
to a lowest common denominator.

I have nothing really to say about GUI-building whatsits in
general; I don't have cause to use them myself so I simply
stand back and let their proponents fight it out. I just
wanted to point out that playing the cross-platform card
does not mean the game is over.

TJG


From lists at cheimes.de  Thu Feb 12 15:40:24 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 21:40:24 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <gn21fo$gnh$1@ger.gmane.org>

azrael wrote:
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

The Python core will not ship with another GUI toolkit. TK may be
removed from the core in some distant future but we - the Python core
development team - will *not* make a choice between GTK, WX and Qt.


> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.

In your opinion all third party are bad. You like to have one monolithic
block of software. That's a typical Microsoft approach. Lot's of people
from the open source community prefer small and loosely coupled pieces
of software. One of the greatest ruler of all time once said "divide et
impera" -- divide it in small pieces to make it much easier to conquer
every piece by its own. We are following the same path here.

Nobody is going to stop you from creating a large bundle of useful
extensions as long as you follow the licenses. In fact lots of people
may appreciate a bundle. But the Python core package will always stay
small and agile.

Christian



From lists at cheimes.de  Thu Feb 12 15:42:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 21:42:14 +0100
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
Message-ID: <gn21j6$gfk$1@ger.gmane.org>

azrael wrote:
> On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
>> azrael <jura.gro... at gmail.com> writes:
>>> To be honest, in compare to Visual Studio, Gui Builders for wx
>>> widgets are really bad.
>> That's because Visual Studio is a Microsoft product to build
>> interfaces for Microsoft products.
>>
>> wx on the other hand is cross platform and ergo, much more
>> complicated.
>>
> 
> I think that WX is really great but there is really a great lack of a
> builder.

This isn't a Python problem - really. Please discuss your issues with
the WX Gui builder on a WX list. We can't do anything about it.

Christian




From gc_ottawa at yahoo.ca  Thu Feb 12 15:53:13 2009
From: gc_ottawa at yahoo.ca (gc_ottawa at yahoo.ca)
Date: Thu, 12 Feb 2009 12:53:13 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<mailman.9428.1234467669.3487.python-list@python.org>
Message-ID: <aedfee1e-d7e2-41fc-88d4-1cf3fd8484cd@h16g2000yqj.googlegroups.com>

......I come from Delphi, and compared to Delphi, even Visual Studio
> vanishes ;-)
...........I don't even notice the difference between Delphi (which
I'm still using)
> and wxPython.
>
> I think this story happened to other people to,
> so instead of putting a lot of effort in designing and maintaining a GUI
> builders,
> it might be better to choose another solution.
>
> btw, the idea I used, can be seen here]http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
> and the code can be found herehttp://code.google.com/p/pylab-works/downloads/list
>
> cheers,
> Stef

You know, 10 or more years ago both Borland and Microsoft got it right
when they incorporated a GUI with an IDE in their Delphi and Visual
Basic products. As wonderful as the Python language is, it is very
much a work in progress when compared to the ease of use of the
aforementioned products. These products revolutionized the industry
with their "Rapid Applications Development" (RAD).

Python reminds me of a toolbox filled with a multitude of single use
tools when all you need is a Skilsaw and a combination screwdriver.
Gord


From joshua at joshuakugler.com  Thu Feb 12 16:22:15 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Thu, 12 Feb 2009 12:22:15 -0900
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com>
Message-ID: <gn23u8$q09$1@ger.gmane.org>

Bob Kline wrote:

> [Didn't realize the mirror didn't work both ways]
> 
> We just upgraded Python to 2.6 on some of our servers and a number of our
> CGI scripts broke because the cgi module has changed the way it handles
> POST requests.

> When the 'action' attribute was not present in the form 
> element on an HTML page the module behaved as if the value of the
> attribute was the URL which brought the user to the page with the form,
> but without the query (?x=y...) part.

This does not make sense.  Can you give an example?  When you POST, the
attributes are not appended to the URL, but form encoded.

> Now FieldStorage.getvalue () is 
> giving the script a list of two copies of the value for some of the
> parameters (folding in the parameters from the previous request) instead
> of the single string it used to return for each.

There is a function call to get only one value.  I think it's get_first() or
some such.

Well, the CGI module hasn't had many changes.  There was this bug fix a few
months back:

http://svn.python.org/view?rev=64447&view=rev

Diff to previous:
http://svn.python.org/view/python/trunk/Lib/cgi.py?rev=64447&r1=58218&r2=64447

For all revisions:
http://svn.python.org/view/python/trunk/Lib/cgi.py?rev=67528&view=log

It is possible that by fixing a bug, they brought the behavior in line with
what it *should* be.  Or maybe the browser behavior changed?  The server
does not care about an "action" attribute.  That only tells the browser
where to send the data.  It is possible the browser did not properly format
a request when there was no "action" attribute. Can you provide more
details?

j



From argo785 at gmail.com  Thu Feb 12 16:23:54 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Thu, 12 Feb 2009 13:23:54 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<op.uo8fbuazwepdt4@ericb.pragmadev>
Message-ID: <65f014fd-2013-48ec-9f2e-ae0527714e24@p13g2000yqc.googlegroups.com>

On Feb 12, 4:29?am, "Eric Brunel" <see.signat... at no.spam> wrote:
> On Thu, 12 Feb 2009 06:06:06 +0100, <argo... at gmail.com> wrote:
>
> [snip]
>
> > My only (minor) complaint is that Tk
> > doesn't draw text antialiased in the various widgets (menus, labels,
> > buttons, etc.).
>
> ?From version 8.5 of tcl/tk, it's supposed to do it. See this page:http://www.tcl.tk/software/tcltk/8.5.tml
> under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only ?
> about X11 and Mac OS X; don't know if it works on Windows...

Looking forward to it. Searching around some more, also found this:

http://tkinter.unpythonic.net/wiki/Tk85AndPython

which sheds a little light.

And following a link therein, it would seem that we'll have it by
default with Python 2.7/3.1 -- [this bug](http://bugs.python.org/
issue2983) was closed about 2 weeks ago.


From hamish at valvesoftware.com  Thu Feb 12 16:26:26 2009
From: hamish at valvesoftware.com (Hamish McKenzie)
Date: Thu, 12 Feb 2009 13:26:26 -0800
Subject: getting caller
Message-ID: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>

so I'm trying to wrap some functionality around execfile but don't want to modify the way it works.  specifically when you call execfile, it automatically grabs globals and locals from the frame the execfile exists in.

so if I wrap execfile in a function, I need a way to reliably get at the calling frame.

what I want to know is - is it *ALWAYS* true that:
inspect.getouterframes( inspect.currentframe() )[ 1 ][ 0 ]

will return me the frame that called execfile in the first place?

I can't think of a way that this wouldn't be the case, but I'm not 100% sure that assertion is valid.
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From martin at marcher.name  Thu Feb 12 16:36:20 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:36:20 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <gn21fo$gnh$1@ger.gmane.org>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
Message-ID: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>

Hi,

at first I wanted to file this under meta-discussions, but your lost
paragraph got me thinking...

2009/2/12 Christian Heimes <lists at cheimes.de>:
> Nobody is going to stop you from creating a large bundle of useful
> extensions as long as you follow the licenses. In fact lots of people
> may appreciate a bundle. But the Python core package will always stay
> small and agile.

How does "small and agile" work with "batteries included"?

>From my point of view:

agile::
 Would describe faster extension of the standard lib (rrd, yaml should
IMHO already be in the standard lib). I'm pretty sure other people
want to see other modules, but that's what agile + standard lib would
mean for me. (Also I'm sometimes confused by the naming of modules but
that's a different story)

small::
 just the opposite of "batteries included"

My absolute favorite would be

 * python as just python (no standard lib)
 * a (rather) fast moving standard lib available as an addon download
  * possibly for each version

I guess that would mean *a lot* maintenance overhead so that will
probably never.

Finally: Ignore me, Python is still the language that let's me get
stuff done in the fastest and most enjoyable way. Thanks to GvR for
the initial idea and all the volounteers for making it even better :)


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From martin at marcher.name  Thu Feb 12 16:36:51 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:36:51 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
Message-ID: <5fa6c12e0902121336j7168bfe6ofeeb194f5851e17b@mail.gmail.com>

Oh yeah and ignore my typos also :)

2009/2/12 Martin <martin at marcher.name>:
> Hi,
>
> at first I wanted to file this under meta-discussions, but your lost
> paragraph got me thinking...
>
> 2009/2/12 Christian Heimes <lists at cheimes.de>:
>> Nobody is going to stop you from creating a large bundle of useful
>> extensions as long as you follow the licenses. In fact lots of people
>> may appreciate a bundle. But the Python core package will always stay
>> small and agile.
>
> How does "small and agile" work with "batteries included"?
>
> From my point of view:
>
> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). I'm pretty sure other people
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)
>
> small::
>  just the opposite of "batteries included"
>
> My absolute favorite would be
>
>  * python as just python (no standard lib)
>  * a (rather) fast moving standard lib available as an addon download
>  * possibly for each version
>
> I guess that would mean *a lot* maintenance overhead so that will
> probably never.
>
> Finally: Ignore me, Python is still the language that let's me get
> stuff done in the fastest and most enjoyable way. Thanks to GvR for
> the initial idea and all the volounteers for making it even better :)
>
>
> --
> http://soup.alt.delete.co.at
> http://www.xing.com/profile/Martin_Marcher
> http://www.linkedin.com/in/martinmarcher
>
> You are not free to read this message,
> by doing so, you have violated my licence
> and are required to urinate publicly. Thank you.
>
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>



-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From Scott.Daniels at Acm.Org  Thu Feb 12 16:40:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 12 Feb 2009 13:40:33 -0800
Subject: Help: makefile in Windows
In-Reply-To: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>
References: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>
Message-ID: <1LydnXXXgdpNCwnUnZ2dnUVZ_sjinZ2d@pdx.net>

Muddy Coder wrote:
> Hi Folks,
> 
> I am learning Extending Python, by testing the demo script of
> Programming Python. In the book, a makefile for Linux is there, but I
> am using Windows currently. I wish somebody would help me to get a
> makefile for Windows, my makefile.linux is as below:

Use distutils, and write a setup.py.  You will want to use mingw32.
Searching for "building python25 C extensions mingw32" should point you
right.

--Scott David Daniels
Scott.Daniels at Acm.Org


From martin at marcher.name  Thu Feb 12 16:42:30 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:42:30 +0100
Subject: how many databases exists?
In-Reply-To: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>
References: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>
Message-ID: <5fa6c12e0902121342h1667f3d2p59603c86b3fcd2cc@mail.gmail.com>

Hi,

you want to check the postgres documentation for that :)

2009/2/12 Rosell Pupo Polanco <rpolanco at estudiantes.uci.cu>:
> hello, i am working in pythoncard and i need to know how many databases
> exist in my server POstgresql, exists some funcion in python that can help
> me??

http://www.postgresql.org/docs/current/static/catalog-pg-database.html

hth
Martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From cameron.pulsford at gmail.com  Thu Feb 12 16:57:19 2009
From: cameron.pulsford at gmail.com (dlocpuwons)
Date: Thu, 12 Feb 2009 13:57:19 -0800 (PST)
Subject: Problem with objects copying each other in memory
Message-ID: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>

Using Python 2.6.1...

I am (attempting) to make an A* search for a chess problem, but I am
running into a really annoying shared memory issue in my successor
function. Here it is stripped down to the important parts that relate
to my problem.

def successors(self):
		result = []
		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
2], [-1, -2]] #possible moves for a knight

		for i in moves:
			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
			temp.x += i[0]
			temp.y += i[1]
			temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
visited states list
			result.append(temp)
		return result

The method creates a temporary Knight object, increments it to the new
position and then adds this new position to its list of visited
states. Then it returns a list of these 8 new objects. The problem
seems to be with the "result.sl.append()" line. As the method chugs
along and creates the new objects the "temp.sl" lines seems to stay in
memory, so when the method is done all the new objects have all the
new states that were made over the course of the method instead of
just their own created in the loop. For example when I try to get
successors for a piece that is initially at (2,2) with no previously
visited states, the method prints this out for the sl (state list)
value

[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]

but what it should print out is

[[2, 2], [4, 3]]
[[2, 2], [4, 1]]
[[2, 2], [0, 3]]
[[2, 2], [0, 1]]
[[2, 2], [3, 4]]
[[2, 2], [3, 0]]
[[2, 2], [1, 4]]
[[2, 2], [1, 0]]

It sort of seems like python is trying to be too smart and is trying
to keep things in memory. Is there anyway to work around this?


From meshko at gmail.com  Thu Feb 12 17:02:29 2009
From: meshko at gmail.com (mk)
Date: Thu, 12 Feb 2009 14:02:29 -0800 (PST)
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
	<9670bb81-a879-43cc-8abf-040e7b18c59d@q9g2000yqc.googlegroups.com>
Message-ID: <e68dedca-01c9-44dc-b6ef-5be909c89103@o11g2000yql.googlegroups.com>

On Feb 11, 11:20?am, Robin <robi... at gmail.com> wrote:
> On Feb 11, 3:33?pm, mk <mes... at gmail.com> wrote:
>
> > Hi,
>
> > I'm trying to consume aSOAPweb service using Python. ?So far I have
> > found two libraries: SOAPpy and ZSI. ?Both of them rely on PyXML which
> > is no longer maintained (and there is no build for 64bit Windows and
> > the setup.py doesn't seem to know how to build it on Windows). ?Is
> > there a liveSOAPlibrary for Python? ?I'm sort of surprised that a
> > common standard likeSOAPis not more actively supported in Python.
> > I'm probably missing something?
>
> > Thanks,
> > m
>
> For consuming services, I've found suds to be the best client:https://fedorahosted.org/suds/
>
> For creating them, I've been using soaplib:http://trac.optio.webfactional.com/
>
> HTH,
>
> Robin

Yes, thank you, Suds worked for me.
Kind of weird how it is not in the google results for obvious searches.


From shreyas22 at gmail.com  Thu Feb 12 17:03:53 2009
From: shreyas22 at gmail.com (shreyas shah)
Date: Thu, 12 Feb 2009 17:03:53 -0500
Subject: Regarding Joystick
In-Reply-To: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
Message-ID: <aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>

Hi ,

I am trying to control the motion of the camera with help of joystick , i
need some basic functionality where if i move a joystick to left the camera
moves to the left . Can anyone help me with that ?

Thanks
Shreyas
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From sushiboy21 at gmail.com  Thu Feb 12 17:04:14 2009
From: sushiboy21 at gmail.com (S-boy)
Date: Thu, 12 Feb 2009 14:04:14 -0800 (PST)
Subject: Can't load smtplib
References: <mailman.9430.1234468246.3487.python-list@python.org>
Message-ID: <6f04dfdc-929f-4584-8319-9ad696901863@b16g2000yqb.googlegroups.com>

Thanks. Turns out I had a script I wrote called email.py in my Python
path that was screwing things up.

On Feb 12, 2:50 pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 12 Feb 2009 11:40:57 -0800 (PST), S-boy <sushibo... at gmail.com> wrote:
> >I can't seem to import smtplib in either a script or the command line
> >interpreter.
>
> >When I try to import smtp, there seems to be some kind of collision
> >with urllib2. I get a weird error about Web server authorization, even
> >though I'm not calling urllib2.
>
> >Any ideas on what might be causing this?
>
> >Here's the mess....
>
> >Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> >[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>
> >>>> import smtplib
>
> >Traceback (most recent call last):
> >  File "<stdin>", line 1, in <module>
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/smtplib.py", line 46, in <module>
> >    import email.Utils
> >  File "email.py", line 4, in <module>
>
> Ooops.  Here's your problem.  Notice how that's not /Library/Frameworks/Python.framework/Versions/2.5/lib/>python2.5/email/?  You have an "email" module that's obscuring the stdlib
>
> email package.
>
>
>
> >    response = urlopen("https://webmail.canwest.com")
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 124, in urlopen
> >    return _opener.open(url, data)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 387, in open
> >    response = meth(req, response)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 498, in http_response
> >    'http', request, response, code, msg, hdrs)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 425, in error
> >    return self._call_chain(*args)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 360, in _call_chain
> >    result = func(*args)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 506, in http_error_default
> >    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
> >urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
> >authorization to fulfill the request. Access to the Web server is
> >denied. Contact the server administrator.  )
>
> Jean-Paul



From lists at cheimes.de  Thu Feb 12 17:08:05 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 23:08:05 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
Message-ID: <gn26k5$3ak$1@ger.gmane.org>

Martin wrote:
[typos igored as requested ;)]

> How does "small and agile" work with "batteries included"?

The Python slogan says "batteries included", not "fusion reactor included".

> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). I'm pretty sure other people
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)
> 
> small::
>  just the opposite of "batteries included"

We have very high standard for the inclusion of new packages to the
stdlib. For lot's of packages it makes no sense to add them to the
stdlib for one or more reason.

The rules are:

 * only mature, well tested, widely used software which is useful
   for a broad audience.
 * PSF License 2.0
 * follows rules for Python and C code
 * The extension must work cross platform as far as all platforms
   support it. Only Python and C89 compatible code, no C++
 * software must be supported for a long time, about 5 to 10 years
   is a minimum.
 * no new features during a release cycle of a minor version
   (about 2 to years)
 * incompatible changes and API changes need at least one minor release
   of deprecation warnings.

It takes at least 1.5 years to get a new feature into an extension and
at least 3 years to remove or change a feature. That's a major shop
stopper for every fast moving piece of Python software.

> My absolute favorite would be
> 
>  * python as just python (no standard lib)
>  * a (rather) fast moving standard lib available as an addon download
>   * possibly for each version
> 
> I guess that would mean *a lot* maintenance overhead so that will
> probably never.

We considered to remove optional software from the core like the email
package, TCL/TK and more. Eventually we decided against it for various
reasons. For one we don't have the resources to maintain additional
packages.

Christian



From clp2 at rebertia.com  Thu Feb 12 17:10:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 12 Feb 2009 14:10:29 -0800
Subject: Problem with objects copying each other in memory
In-Reply-To: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902121410u50df6c7cy342ec1f6a00cd545@mail.gmail.com>

On Thu, Feb 12, 2009 at 1:57 PM, dlocpuwons <cameron.pulsford at gmail.com> wrote:
> Using Python 2.6.1...
>
> I am (attempting) to make an A* search for a chess problem, but I am
> running into a really annoying shared memory issue in my successor
> function. Here it is stripped down to the important parts that relate
> to my problem.
>
> def successors(self):
>                result = []
>                moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
> 2], [-1, -2]] #possible moves for a knight
>
>                for i in moves:
>                        temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>                        temp.x += i[0]
>                        temp.y += i[1]
>                        temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
> visited states list
>                        result.append(temp)
>                return result
>
> The method creates a temporary Knight object, increments it to the new
> position and then adds this new position to its list of visited
> states. Then it returns a list of these 8 new objects. The problem
> seems to be with the "result.sl.append()" line. As the method chugs
> along and creates the new objects the "temp.sl" lines seems to stay in
> memory, so when the method is done all the new objects have all the
> new states that were made over the course of the method instead of
> just their own created in the loop. For example when I try to get
> successors for a piece that is initially at (2,2) with no previously
> visited states, the method prints this out for the sl (state list)
> value

Just a guess based on the behavior you described, but do you by chance
have the Knight class defined as something like this?:

class Knight(whatever):
    sl = []

If so, that is not the proper way to create an instance variable in
Python. You've instead created a class variable, which is shared by
all instances of the class.

class Knight(whatever):
    def __init__(self, some, args, here):
        self.sl = []

If not, do you by chance define Knight as:

class Knight(whatever):
    def __init__(self, some, args, here, sl=[]):
        self.sl = sl

If so, you've fallen victim to the Important Warning on
http://docs.python.org/tutorial/controlflow.html#default-argument-values
under "Default Argument Values". The correct way to code it is:

class Knight(whatever):
    def __init__(self, some, args, here, sl=None):
        if sl is None: sl = []
        self.sl = sl

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From andrew at acooke.org  Thu Feb 12 17:15:08 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 19:15:08 -0300 (CLST)
Subject: Problem with objects copying each other in memory
In-Reply-To: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
Message-ID: <6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>


you're setting the new knight's "sl" to the value self.sl and then adding
values to it.  that's the same list - so you are adding values to the
self.sl list when you add them to the knight's sl.

this is easier to understand just by seeing the fix, which is to use:

temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))

which will make a new copy of the list, so you are only adding to the sl
in the (new) knight.

andrew



dlocpuwons wrote:
> Using Python 2.6.1...
>
> I am (attempting) to make an A* search for a chess problem, but I am
> running into a really annoying shared memory issue in my successor
> function. Here it is stripped down to the important parts that relate
> to my problem.
>
> def successors(self):
> 		result = []
> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
> 2], [-1, -2]] #possible moves for a knight
>
> 		for i in moves:
> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
> 			temp.x += i[0]
> 			temp.y += i[1]
> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
> visited states list
> 			result.append(temp)
> 		return result
>
> The method creates a temporary Knight object, increments it to the new
> position and then adds this new position to its list of visited
> states. Then it returns a list of these 8 new objects. The problem
> seems to be with the "result.sl.append()" line. As the method chugs
> along and creates the new objects the "temp.sl" lines seems to stay in
> memory, so when the method is done all the new objects have all the
> new states that were made over the course of the method instead of
> just their own created in the loop. For example when I try to get
> successors for a piece that is initially at (2,2) with no previously
> visited states, the method prints this out for the sl (state list)
> value
>
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
>
> but what it should print out is
>
> [[2, 2], [4, 3]]
> [[2, 2], [4, 1]]
> [[2, 2], [0, 3]]
> [[2, 2], [0, 1]]
> [[2, 2], [3, 4]]
> [[2, 2], [3, 0]]
> [[2, 2], [1, 4]]
> [[2, 2], [1, 0]]
>
> It sort of seems like python is trying to be too smart and is trying
> to keep things in memory. Is there anyway to work around this?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From rt8396 at gmail.com  Thu Feb 12 17:22:05 2009
From: rt8396 at gmail.com (r)
Date: Thu, 12 Feb 2009 14:22:05 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <7a52418e-82b7-4901-8c82-d90ce70160b7@v39g2000yqm.googlegroups.com>

On Feb 12, 2:04?pm, azrael <jura.gro... at gmail.com> wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.

I don't follow you here??

> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

There is a list of third party modules on the Python.org site and it
is huge! Tk is very simple i agree, but i would hate to double the
size of my python installer download just to have this or that module
built-in. Trust me you really don't want that. But i will agree a
better classification of modules would be nice

> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.
>
> Anyone I talk to says: "Oh my god, Python and GUI"

I will agree with you here. Just think what could be accomplished if
all the linux distro developers could band together to create one
golden linux distro. This level of collaboration would create a distro
so powerful the vibrations of it will cause Bill Gates house to slide
into lake Washington :).

Tk could use a polishing i much agree and so could IDLE. Maybe we
should start a revolution here? i am game!

> There are a dozen of modules that should be, if you ask me, be
> implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
> talk to, are using them. But everyone has to download them manually
> and hope that if someone is using their code, has also installed the
> needed modules.

Again i very much disagree here. We don't want to make Python a piece
of elephant-size MS bloatware. Not everybody needs or wants all these
libraries and maintaining this extra code-base puts exrta strain on
the Python dev team. We need them to concentrate on other more
important issues.

> My solution would be:
> Let's make an announcement on Python.org. something like this.
>
> We need Ideas for creating the a standard library in Python for Image
> processing. Tell ?us your problem. What do you think which feature
> should be implemented. Which transformation, which algorithm.
> Make a vote. This should be that not.

There is a library PIL but it could use some updating too.

> But how to start something like that. Anyone that sees a problem that
> should be solved, becomes the project leader. Find the best Ideas and
> make a good library.

Motivation is hard to find, and it's more than that. People have to
make a living, but we never know until we try. I am with you! Lest
revolutionize Python!

> It's is very good that people have a choice. But why not make some
> standards. I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......

Bloated_python == dead_Python

> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.
>
> This group has a lot of members. not to mention every Python Forum.
> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

I agree, anybody else out there want to add to this converstation?



From tjreedy at udel.edu  Thu Feb 12 17:24:05 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 17:24:05 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <gn27i0$67k$1@ger.gmane.org>

azrael wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.
> 
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

You are welcome to volunteer to write entries for the Python wiki.



From sambit2005 at gmail.com  Thu Feb 12 17:25:57 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Fri, 13 Feb 2009 11:25:57 +1300
Subject: getting caller
In-Reply-To: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
Message-ID: <9e680b420902121425y6c20f6abnee3afa4059e772d1@mail.gmail.com>

Hi

I am new to Python world

 I need a python script , which binds at a user defind port & sends to other
enity , which waits at particular port.
The other enity will respond & Python script should receive that at the
defined port

The communication will happen over UDP

e.g

Python Appl

IP: 10.116.78.90
Port : 3000


Other Enity :

IP: 10.116.98.87
Port : 3010


Pyhon Appl ------------>UDP  ----> Other Enity
                  <--------------------------


Please help
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From cameron.pulsford at gmail.com  Thu Feb 12 17:29:29 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Thu, 12 Feb 2009 17:29:29 -0500
Subject: Problem with objects copying each other in memory
In-Reply-To: <6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
Message-ID: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>

Thanks, that did it! Why is that the case though? Or rather, why do  
the assignments to temp.x and temp.y not effect the self.x and self.y?  
How come I only run into the problem with the list?


On Feb 12, 2009, at 5:15 PM, andrew cooke wrote:

>
> you're setting the new knight's "sl" to the value self.sl and then  
> adding
> values to it.  that's the same list - so you are adding values to the
> self.sl list when you add them to the knight's sl.
>
> this is easier to understand just by seeing the fix, which is to use:
>
> temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))
>
> which will make a new copy of the list, so you are only adding to  
> the sl
> in the (new) knight.
>
> andrew
>
>
>
> dlocpuwons wrote:
>> Using Python 2.6.1...
>>
>> I am (attempting) to make an A* search for a chess problem, but I am
>> running into a really annoying shared memory issue in my successor
>> function. Here it is stripped down to the important parts that relate
>> to my problem.
>>
>> def successors(self):
>> 		result = []
>> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
>> 2], [-1, -2]] #possible moves for a knight
>>
>> 		for i in moves:
>> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>> 			temp.x += i[0]
>> 			temp.y += i[1]
>> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to  
>> the
>> visited states list
>> 			result.append(temp)
>> 		return result
>>
>> The method creates a temporary Knight object, increments it to the  
>> new
>> position and then adds this new position to its list of visited
>> states. Then it returns a list of these 8 new objects. The problem
>> seems to be with the "result.sl.append()" line. As the method chugs
>> along and creates the new objects the "temp.sl" lines seems to stay  
>> in
>> memory, so when the method is done all the new objects have all the
>> new states that were made over the course of the method instead of
>> just their own created in the loop. For example when I try to get
>> successors for a piece that is initially at (2,2) with no previously
>> visited states, the method prints this out for the sl (state list)
>> value
>>
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>>
>> but what it should print out is
>>
>> [[2, 2], [4, 3]]
>> [[2, 2], [4, 1]]
>> [[2, 2], [0, 3]]
>> [[2, 2], [0, 1]]
>> [[2, 2], [3, 4]]
>> [[2, 2], [3, 0]]
>> [[2, 2], [1, 4]]
>> [[2, 2], [1, 0]]
>>
>> It sort of seems like python is trying to be too smart and is trying
>> to keep things in memory. Is there anyway to work around this?
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>



From andrew at acooke.org  Thu Feb 12 18:04:23 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 20:04:23 -0300 (CLST)
Subject: Problem with objects copying each other in memory
In-Reply-To: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
Message-ID: <54753ad5197ca440238714f7e1c8ffae.squirrel@acooke.dyndns.org>


the official answer to that question is here -
http://docs.python.org/reference/datamodel.html?highlight=containers - at
about the 6th paragraph where it talks about "containers".

i think it's a hard question and really in a sense (imho) the real reason
is just that this tends to be the best compromise for the kind of language
that python is.

andrew


Cameron Pulsford wrote:
> Thanks, that did it! Why is that the case though? Or rather, why do
> the assignments to temp.x and temp.y not effect the self.x and self.y?
> How come I only run into the problem with the list?
>
>
> On Feb 12, 2009, at 5:15 PM, andrew cooke wrote:
>
>>
>> you're setting the new knight's "sl" to the value self.sl and then
>> adding
>> values to it.  that's the same list - so you are adding values to the
>> self.sl list when you add them to the knight's sl.
>>
>> this is easier to understand just by seeing the fix, which is to use:
>>
>> temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))
>>
>> which will make a new copy of the list, so you are only adding to
>> the sl
>> in the (new) knight.
>>
>> andrew
>>
>>
>>
>> dlocpuwons wrote:
>>> Using Python 2.6.1...
>>>
>>> I am (attempting) to make an A* search for a chess problem, but I am
>>> running into a really annoying shared memory issue in my successor
>>> function. Here it is stripped down to the important parts that relate
>>> to my problem.
>>>
>>> def successors(self):
>>> 		result = []
>>> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
>>> 2], [-1, -2]] #possible moves for a knight
>>>
>>> 		for i in moves:
>>> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>>> 			temp.x += i[0]
>>> 			temp.y += i[1]
>>> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to
>>> the
>>> visited states list
>>> 			result.append(temp)
>>> 		return result
>>>
>>> The method creates a temporary Knight object, increments it to the
>>> new
>>> position and then adds this new position to its list of visited
>>> states. Then it returns a list of these 8 new objects. The problem
>>> seems to be with the "result.sl.append()" line. As the method chugs
>>> along and creates the new objects the "temp.sl" lines seems to stay
>>> in
>>> memory, so when the method is done all the new objects have all the
>>> new states that were made over the course of the method instead of
>>> just their own created in the loop. For example when I try to get
>>> successors for a piece that is initially at (2,2) with no previously
>>> visited states, the method prints this out for the sl (state list)
>>> value
>>>
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>>
>>> but what it should print out is
>>>
>>> [[2, 2], [4, 3]]
>>> [[2, 2], [4, 1]]
>>> [[2, 2], [0, 3]]
>>> [[2, 2], [0, 1]]
>>> [[2, 2], [3, 4]]
>>> [[2, 2], [3, 0]]
>>> [[2, 2], [1, 4]]
>>> [[2, 2], [1, 0]]
>>>
>>> It sort of seems like python is trying to be too smart and is trying
>>> to keep things in memory. Is there anyway to work around this?
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>>
>
>




From python.dev.9 at gmail.com  Thu Feb 12 18:44:45 2009
From: python.dev.9 at gmail.com (mercado)
Date: Thu, 12 Feb 2009 18:44:45 -0500
Subject: Passing a variable number of arguments to a function
Message-ID: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>

I have the following piece of code that is bugging me:

#-------------------------------------------------------------------------------
def someFunc(arg1, arg2=True, arg3=0):
    print arg1, arg2, arg3

someTuple = (
    ("this is a string",),
    ("this is another string", False),
    ("this is another string", False, 100)
)

for argList in someTuple:
    if len(argList) == 1:
        someFunc(argList[0])
    elif len(argList) == 2:
        someFunc(argList[0], argList[1])
    elif len(argList) == 3:
        someFunc(argList[0], argList[1], argList[2])
#-------------------------------------------------------------------------------

Is it possible to rewrite this code so I don't have that awkward if
statement at the bottom that passes every variation in the number of
arguments to the function?  I know that it's possible to define a function
to accept a variable number of parameters using *args or **kwargs, but it's
not possible for me to redefine this function in the particular project I'm
working on.

What I would really like to do is something like this (pseudocode) and do
away with the if statement completely:

#-------------------------------------------------------------------------------
def someFunc(arg1, arg2=True, arg3=0):
    print arg1, arg2, arg3

someTuple = (
    ("this is a string",),
    ("this is another string", False),
    ("this is another string", False, 100)
)

for argList in someTuple:
    someFunc(expandArgList(argList))
#-------------------------------------------------------------------------------

Is this possible?  Thanks in advance.
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From akitada at gmail.com  Thu Feb 12 18:45:32 2009
From: akitada at gmail.com (Akira Kitada)
Date: Fri, 13 Feb 2009 08:45:32 +0900
Subject: New book "The Python Programming Language" by Guido van Rossum
Message-ID: <90bb445a0902121545s77378e59y74d63cee8d9ba02e@mail.gmail.com>

The Python Programming Language by Guido van Rossum, Raymond Hettinger,
Jack Diedrich, David Beazley, David Mertz, Nicholas Coghlan to be published.
http://www.amazon.co.uk/Python-Programming-Language-Guido-Rossum/dp/0132299690

Anyone found the TOC of this?

Thanks,


From clp2 at rebertia.com  Thu Feb 12 18:51:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 12 Feb 2009 15:51:25 -0800
Subject: Passing a variable number of arguments to a function
In-Reply-To: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>
References: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>
Message-ID: <50697b2c0902121551s8bbf434hd6be17e7cee1f333@mail.gmail.com>

On Thu, Feb 12, 2009 at 3:44 PM, mercado <python.dev.9 at gmail.com> wrote:
> I have the following piece of code that is bugging me:
>
> #-------------------------------------------------------------------------------
> def someFunc(arg1, arg2=True, arg3=0):
>     print arg1, arg2, arg3
>
> someTuple = (
>     ("this is a string",),
>     ("this is another string", False),
>     ("this is another string", False, 100)
> )
>
> for argList in someTuple:
>     if len(argList) == 1:
>         someFunc(argList[0])
>     elif len(argList) == 2:
>         someFunc(argList[0], argList[1])
>     elif len(argList) == 3:
>         someFunc(argList[0], argList[1], argList[2])
> #-------------------------------------------------------------------------------
>
> Is it possible to rewrite this code so I don't have that awkward if
> statement at the bottom that passes every variation in the number of
> arguments to the function?  I know that it's possible to define a function
> to accept a variable number of parameters using *args or **kwargs, but it's
> not possible for me to redefine this function in the particular project I'm
> working on.

There is a nicely symmetrical calling syntax that does the inverse of
* in a function declaration:

for argList in someTuple:
    someFunc(*argList)

There's also an analogous func(**dictOfKwdArgs) call syntax.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From john106henry at hotmail.com  Thu Feb 12 18:55:37 2009
From: john106henry at hotmail.com (John Henry)
Date: Thu, 12 Feb 2009 15:55:37 -0800 (PST)
Subject: Invoking CutePDF from within Python
Message-ID: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>

Hi all,

I have a need to invoke CutePDF from within a Python program.  The
program creates an EXCEL spreadsheet and set the print area and
properties.  Then I wish to store the spreadsheet in a PDF file.
xtopdf does not work well (text only).  ReportLab is an overkill.
PyPDF can only shuffle PDF pages.

All I need is to say "Print this to CUTEPDF and store as xyz.pdf".

I found that this can be done in VB but I do not know VB,
unfortunately.

Private Sub Print_PDF()

     Dim lRetVal As Long
     Dim hKey As Long
     Dim sValue As String
     lRetVal = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\Custom PDF
Printer",  _
                    0&, vbNullString, REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS, _
                    0&, hKey, lRetVal)
     sValue = "C:\Sample.pdf"
     RegSetValueExString hKey, "OutputFile", 0&, REG_SZ, sValue, Len
(sValue)
     sValue = "1"
     RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
(sValue)

     Dim worddoc As Word.Document
     Set worddoc = wordapp.Documents.Open("C:\Sample.doc")
     wordapp.ActivePrinter = "Custom PDF Printer"
     wordapp.PrintOut
     worddoc.Close

     sValue = "0"
     RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
(sValue)
     RegCloseKey (hKey)

End Sub


From http  Thu Feb 12 18:59:08 2009
From: http (Paul Rubin)
Date: 12 Feb 2009 15:59:08 -0800
Subject: New book "The Python Programming Language" by Guido van Rossum
References: <mailman.9451.1234482336.3487.python-list@python.org>
Message-ID: <7x3aejgqb7.fsf@ruckus.brouhaha.com>

Akira Kitada <akitada at gmail.com> writes:
> The Python Programming Language by Guido van Rossum, Raymond Hettinger,
> Jack Diedrich, David Beazley, David Mertz, Nicholas Coghlan to be published.
> http://www.amazon.co.uk/Python-Programming-Language-Guido-Rossum/dp/0132299690

Wow!  But it says the pub date is 28 Aug 2009.

> Anyone found the TOC of this?

Chances are, it's still being written and the final TOC is not yet known.


From jason.scheirer at gmail.com  Thu Feb 12 19:13:11 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Thu, 12 Feb 2009 16:13:11 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <47c331cb-5adb-42ef-9741-8537f91b82e8@p13g2000yqc.googlegroups.com>

On Feb 12, 12:04?pm, azrael <jura.gro... at gmail.com> wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.
>
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.
>
> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.
>
> Anyone I talk to says: "Oh my god, Python and GUI"
>
> There are a dozen of modules that should be, if you ask me, be
> implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
> talk to, are using them. But everyone has to download them manually
> and hope that if someone is using their code, has also installed the
> needed modules.
>
> My solution would be:
> Let's make an announcement on Python.org. something like this.
>
> We need Ideas for creating the a standard library in Python for Image
> processing. Tell ?us your problem. What do you think which feature
> should be implemented. Which transformation, which algorithm.
> Make a vote. This should be that not.
>
> But how to start something like that. Anyone that sees a problem that
> should be solved, becomes the project leader. Find the best Ideas and
> make a good library.
>
> It's is very good that people have a choice. But why not make some
> standards. I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......
>
> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.
>
> This group has a lot of members. not to mention every Python Forum.
> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

Now hold on here, Microsoft has a pretty schizophrenic opinion on GUIs
itself. Over the years you've had direct Win32 calls, the MFC
libraries, then WinForms and later WPF on .NET. If I were a C++/C#
developer new to Windows, which one should I go with? Or how about I
want to be cross-platform and start looking into Fox or QT or even
GTK?

The only difference between this and the number of Python GUIs is that
your version of Visual Studio sticks around for a few years. You could
standardize on a single version of the GUI you're using (say, WX) and
declare it to have a 5 year lifespan in your organization, install QT
builder and use that, or any of a large number of options. Don't
expect other people to make the decision for you, though, as an open
source environment brings about a plurality of options. Python has a
far broader scope as a tool for all kinds of tasks than a GUI-Centric
Microsoft development environment, and assuming every Python developer
wants to focus on making Python a vehicle of platform-specific GUIs
for producing shrink-wrapped software is a little off base.

> Anyone I talk to says: "Oh my god, Python and GUI"

Have these people needed to spend much time getting to know any one
GUI environment? They all suck in every language at first, then the
Stockholm syndrome sets in and it's not so bad.

The problem here also is that there have been attempts to get
something going that sputtered and failed (a sort of anygui module).
It's relatively easy to standardize on how to talk to a relational
database (that PEP is nice and solid), but looking at a grand unified
way of talking to so many different paradigms of GUI library, writing
bindings, testing, etc. is a much larger, less sensical beast. The
cross-platform UIs like Swing or QT all feel slightly out-of-place on
many systems because the interface elements and design decisions are
different from platform to platform.

If you want a platform-integrated GUI, use Glade/GTK/Python or QT
Designer/Python in Linux, XCode/Interface Builder/PyObjC in OSX, and
even consider IronPython and the .Net GUI stuff on Windows. Heck, I've
done some Swing and Jython and it was not as bad as writing Swing in
Java.

Might I also suggest that if you are struggling to make a proper GUI
in Python, and a GUI is what you need, that Python is probably not the
right tool for you to be using to get the job done.


From jura.grozni at gmail.com  Thu Feb 12 19:22:32 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 16:22:32 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
	<mailman.9434.1234470281.3487.python-list@python.org>
Message-ID: <678601bf-65ef-4afa-afc5-2d4cef4d457f@v42g2000yqj.googlegroups.com>

On Feb 12, 9:24?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Philip Semanchuk wrote:
>
> > On Feb 12, 2009, at 3:04 PM, azrael wrote:
>
> >> Why will Microsoft's products kick the ass of open source. Because
> >> anyone does what he wants. Let's say There are 5 GUI libraries
> >> competing against each other. Think about it what could these 5 teams
> >> acomplish if they would work together. Or maybe a framework for RAD
> >> GUI devbelopment. after 10 years of python, there is still not one
> >> application for GUI Building that can beat Visual Studio.
>
> > Let me know when Visual Studio tries to address building GUIs for
> > Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to
> > oranges, or chalk and cheese if you're from that part of the world.
>
> While your point is obviously good, it only applies if you
> even care about building for OS X, Gnome etc. If all you
> want is build on Windows (or Gnome or KDE or whatever) then
> the cross-platformness of any proposed toolkit is worthless
> and may even be a drawback if it reduces its functionality
> to a lowest common denominator.
>
> I have nothing really to say about GUI-building whatsits in
> general; I don't have cause to use them myself so I simply
> stand back and let their proponents fight it out. I just
> wanted to point out that playing the cross-platform card
> does not mean the game is over.
>
> TJG

OK. If I don't use GUIs, is there anything other that I do. Is there
anything else where I can contribute. Maybe there should be a better
networking, crypto, database connection library. Or whatever.

Forget about Crossplatform Gui Building. That is something that the
developers from wxWidgets think about. Where is the point of python in
crossplatform compability if I download on windows machine a piece of
code writen for GTK and I don't have anything installed to support it.
Again I am going to make some downloads. Python is bundled with TK,
which is out of date.



From jura.grozni at gmail.com  Thu Feb 12 19:39:06 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 16:39:06 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
Message-ID: <7160ddaf-b202-4e41-a8a5-b12a280ca04e@v13g2000yqm.googlegroups.com>

On Feb 12, 9:40?pm, Christian Heimes <li... at cheimes.de> wrote:
> azrael wrote:
> > I think that there should be a list on python.org of supported or
> > sugested modules for some need. For example Database access. Or GUI
> > Building. It is a complete pain in the ass. Let's face the true, TK is
> > out of date. There should be another one used and appended to the
> > standard Python Library. One that plays well with other platforms. And
> > if it does't, let's make it play better.
>
> The Python core will not ship with another GUI toolkit. TK may be
> removed from the core in some distant future but we - the Python core
> development team - will *not* make a choice between GTK, WX and Qt.
>
> > One other thing. I am not looking for war on groups. I just would like
> > to discuss some things that drive me crazy while using Python.
>
> In your opinion all third party are bad. You like to have one monolithic
> block of software. That's a typical Microsoft approach. Lot's of people
> from the open source community prefer small and loosely coupled pieces
> of software. One of the greatest ruler of all time once said "divide et
> impera" -- divide it in small pieces to make it much easier to conquer
> every piece by its own. We are following the same path here.
>
> Nobody is going to stop you from creating a large bundle of useful
> extensions as long as you follow the licenses. In fact lots of people
> may appreciate a bundle. But the Python core package will always stay
> small and agile.
>
> Christian

I understand that. completely. I don't think that third party is bad.
It is great that someone has an Idea and decides to make a new
project. But why not adopting best practices or maybe even make a
small effort to construct better support for some popular and commonly
used modules. If these modules always stay third party, there will
come a day when they stop being developed. At this point , Python
looses a good module from beeing developed any further. And some time
later, someone else starts again from scratch and make something new.

I came to Python because it has some features that always annoyed me
in C++ or Java. The diference between Java and Python that Java is
today way much often used thaen python, has a much larger Library
collection. I am mainly afraid that Python will become just a small
Scripting languages. There are a lot of people that say that they
would start Python, but they dont't want to because they don't want to
get their results in Comand line. I don't say that Comandline is bad,
but I think about the common user.


From rhodri at wildebst.demon.co.uk  Thu Feb 12 19:51:10 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 00:51:10 -0000
Subject: Problem with objects copying each other in memory
In-Reply-To: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
Message-ID: <op.uo9lzkb6a8ncjz@gnudebst>

On Thu, 12 Feb 2009 22:29:29 -0000, Cameron Pulsford  
<cameron.pulsford at gmail.com> wrote:

> Thanks, that did it! Why is that the case though? Or rather, why do the  
> assignments to temp.x and temp.y not effect the self.x and self.y? How  
> come I only run into the problem with the list?

Variable names and assignment don't work the same way in Python as they
do in C (say).  What assignment does is to attach the name on the left
to the object on the right.  Obviously this is oversimplifying, since
"the name on the left" could be a list or dictionary element or the like,
but the principle holds: variables aren't objects themselves, they're
just references to objects.

For your ordinary everyday integers, this is arranged to be no different
 from normal.  Suppose we have

     x = 5
     y = x
     x = x + 1
     print y

Then we start by creating an integer object with the value 5 and labelling
it "x".  Then we pick up that object and label it 'y' as well.  The next
line causes us to create an integer object with the value 1, pick up the
object we called 'x', and tell that object to add the '1' object to itself.
That results in creating a brand new object (with the value 6), which we
then label 'x'.  The original '5' object (still labelled 'y') hasn't been
changed by this, because Python does arithmetic by creating new integer
objects.

Lists operate the same way for concatenation and repetition.

    a = [1, 2, 3]
    b = [4, 5, 6]
    c = a
    a = a + b
    print c

The "a = a + b" line creates a new list consisting of the elements of
the old list 'a' followed by the elements of the old list 'b', without
changing either of those lists in the slightest, and then calls this
new list 'a'.  The old list is still hanging around, and still has the
label 'c' attached to it.

The differences from your expectations arise because lists are mutable,
and integers aren't.  In other words we can change the contents of a
list "in place" without creating a new list.

     a = [1, 2, 3]
     b = a
     a.append(4)
     print b

Here, the list has both labels 'a' and 'b' attached to it.  When we
call a.append, it doesn't create a new list or anything like that,
it just makes the existing list larger and tacks the new value on
the end.  Because it's still the same list as before, it's still
got both names attached to it, so when you print 'b' out you see
the changed list [1, 2, 3, 4].

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From argo785 at gmail.com  Thu Feb 12 20:09:26 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Thu, 12 Feb 2009 17:09:26 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<op.uo8fbuazwepdt4@ericb.pragmadev>
Message-ID: <279ea3e5-edcb-42a6-a7b8-016d55cd7453@f3g2000yqf.googlegroups.com>

On Feb 12, 4:29?am, "Eric Brunel" <see.signat... at no.spam> wrote:
> On Thu, 12 Feb 2009 06:06:06 +0100, <argo... at gmail.com> wrote:
>
> [snip]
>
> > My only (minor) complaint is that Tk
> > doesn't draw text antialiased in the various widgets (menus, labels,
> > buttons, etc.).
>
> ?From version 8.5 of tcl/tk, it's supposed to do it. See this page:http://www.tcl.tk/software/tcltk/8.5.tml
> under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only ?
> about X11 and Mac OS X; don't know if it works on Windows...

I also don't know about MS Windows. I've been fortunate enough to not
have to use that OS for *years*.

Also, after some more searching, found this:

http://tkinter.unpythonic.net/wiki/Tk85AndPython

And according to [this](http://bugs.python.org/issue2983), the ttk
support has been merged into Python 2.7/3.1 as of about 2 weeks ago.


From rhodri at wildebst.demon.co.uk  Thu Feb 12 20:10:59 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 01:10:59 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<6viv4bFk8gonU1@mid.uni-berlin.de>
	<DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>
Message-ID: <op.uo9mwlmta8ncjz@gnudebst>

On Thu, 12 Feb 2009 16:44:56 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> I simply ask, "How do I get around the problem?"

Run your program from the command line, or by double-clicking.
You've been told this several times now.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From notvalid2 at sbcglobal.net  Thu Feb 12 20:16:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 17:16:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9419.1234461666.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
Message-ID: <mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>

Greetings and salutations.

I just uninstalled all traces of (Active) pythonWin 2.5.2 from this machine, 
In fact, I uninstalled python 2.5.2 with IDLE from this machine. I then 
reinstalled the latter. Then I ran the program. XP Pro.

I then went to another machine that has never had pythonWin on it all, but 
does have python 2.5.2 with IDLE. I ran the same program there. W2K.

In both cases, I got the output below. Your conclusions?

===========================Output on Interactive Shell Screen===========
GUI self----------->>>>:  <__main__.Sentuser_GUI instance at 0x02154058>
counter:  3
OSett self =  <__main__.Sentuser_GUI instance at 0x02154058> type = <type 
'instance'>
gray scale now--wtw:  True
Set OSDiag sdict
body from OSDialog, self = .35167928 type = <type 'instance'>
apply OSD ok
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python25\Lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 553, in OperationalSettings
     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 81, in __init__
     tkSimpleDialog.Dialog.__init__(self, parent)
   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
     self.wait_visibility() # window needs to be visible for the grab
   File "C:\Python25\Lib\lib-tk\Tkinter.py", line 415, in wait_visibility
     self.tk.call('tkwait', 'visibility', window._w)
TclError: window ".35167928" was deleted before its visibility changed


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From rhodri at wildebst.demon.co.uk  Thu Feb 12 20:27:54 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 01:27:54 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
Message-ID: <op.uo9nosqga8ncjz@gnudebst>

On Fri, 13 Feb 2009 01:16:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> Greetings and salutations.
>
> I just uninstalled all traces of (Active) pythonWin 2.5.2 from this  
> machine, In fact, I uninstalled python 2.5.2 with IDLE from this  
> machine. I then reinstalled the latter. Then I ran the program. XP Pro.
>
> I then went to another machine that has never had pythonWin on it all,  
> but does have python 2.5.2 with IDLE. I ran the same program there. W2K.
>
> In both cases, I got the output below. Your conclusions?

That you haven't listened to a word anyone has said.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jura.grozni at gmail.com  Thu Feb 12 20:48:33 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 17:48:33 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
	<mailman.9436.1234471506.3487.python-list@python.org>
Message-ID: <c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>

On Feb 12, 9:42?pm, Christian Heimes <li... at cheimes.de> wrote:
> azrael wrote:
> > On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
> >> azrael <jura.gro... at gmail.com> writes:
> >>> To be honest, in compare to Visual Studio, Gui Builders for wx
> >>> widgets are really bad.
> >> That's because Visual Studio is a Microsoft product to build
> >> interfaces for Microsoft products.
>
> >> wx on the other hand is cross platform and ergo, much more
> >> complicated.
>
> > I think that WX is really great but there is really a great lack of a
> > builder.
>
> This isn't a Python problem - really. Please discuss your issues with
> the WX Gui builder on a WX list. We can't do anything about it.
>
> Christian

How come that it is a problem for the people from WX. It is also a
problem of Python. Python people say that that is not their problem.
Let wX team make the work. But we, who program in python use also wX.
The development of such a tool would make us all a big favour. Well if
99 percent of computer users use GUIs an prefer it in comparison with
comand line, Why should it be a pain in the ass to make a application
that we could offer to normal common users.


From cjns1989 at gmail.com  Thu Feb 12 20:48:35 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 12 Feb 2009 20:48:35 -0500
Subject: Ipython - Do they have a separate mailing list or newsgroup?
Message-ID: <20090213014835.GC2889@turki.gavron.org>

Just wondering if ipython is supported elsewhere.

Thanks,

CJ



From cournape at gmail.com  Thu Feb 12 21:19:12 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 11:19:12 +0900
Subject: Ipython - Do they have a separate mailing list or newsgroup?
In-Reply-To: <20090213014835.GC2889@turki.gavron.org>
References: <20090213014835.GC2889@turki.gavron.org>
Message-ID: <5b8d13220902121819w4ed2ac87gad056fccb0f18534@mail.gmail.com>

On Fri, Feb 13, 2009 at 10:48 AM, Chris Jones <cjns1989 at gmail.com> wrote:
> Just wondering if ipython is supported elsewhere.
>

The ipython mailing list is there:

http://projects.scipy.org/mailman/listinfo/ipython-user

David


From ldl08 at gmx.net  Thu Feb 12 21:20:54 2009
From: ldl08 at gmx.net (David)
Date: Fri, 13 Feb 2009 10:20:54 +0800
Subject: Ipython - Do they have a separate mailing list or newsgroup?
In-Reply-To: <20090213014835.GC2889@turki.gavron.org>
References: <20090213014835.GC2889@turki.gavron.org>
Message-ID: <4994D906.9020006@gmx.net>

Chris Jones wrote:
> Just wondering if ipython is supported elsewhere.

Indeed, indeed:

IPython-user mailing list
IPython-user at scipy.org
http://lists.ipython.scipy.org/mailman/listinfo/ipython-user

David


From cournape at gmail.com  Thu Feb 12 21:25:26 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 11:25:26 +0900
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
	<mailman.9436.1234471506.3487.python-list@python.org>
	<c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>
Message-ID: <5b8d13220902121825k2ce7b07aw6c5713e525d4f490@mail.gmail.com>

On Fri, Feb 13, 2009 at 10:48 AM, azrael <jura.grozni at gmail.com> wrote:
> On Feb 12, 9:42 pm, Christian Heimes <li... at cheimes.de> wrote:
>> azrael wrote:
>> > On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
>> >> azrael <jura.gro... at gmail.com> writes:
>> >>> To be honest, in compare to Visual Studio, Gui Builders for wx
>> >>> widgets are really bad.
>> >> That's because Visual Studio is a Microsoft product to build
>> >> interfaces for Microsoft products.
>>
>> >> wx on the other hand is cross platform and ergo, much more
>> >> complicated.
>>
>> > I think that WX is really great but there is really a great lack of a
>> > builder.
>>
>> This isn't a Python problem - really. Please discuss your issues with
>> the WX Gui builder on a WX list. We can't do anything about it.
>>
>> Christian
>
> How come that it is a problem for the people from WX. It is also a
> problem of Python. Python people say that that is not their problem.
> Let wX team make the work. But we, who program in python use also wX.
> The development of such a tool would make us all a big favour. Well if
> 99 percent of computer users use GUIs an prefer it in comparison with
> comand line, Why should it be a pain in the ass to make a application
> that we could offer to normal common users.

Because not all discussion related to python happens on this ML- this
has nothing to do with the usefulness of GUI per-se. This is about
general questions about python.

David


From notvalid2 at sbcglobal.net  Thu Feb 12 21:40:12 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 18:40:12 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
Message-ID: <I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>

 From Diez above.
What does *NOT* work is writing a Tkinter-based app in idle, and to run it
*FROM INSIDE* idle. Instead, open your explorer and double-click on the
pyhton-file your app is in. That's all that there is to it.

So this is the absolute truth? No wiggle room? One can never use a Tkinter 
program with IDLE, and execute it successfully. So IDLE doesn't issue a 
standard warning that says, "Get out of here with your Tkinter program, it 
will fail when you try to run it here. You have entered Tkinter hell. 
Good-bye."

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jura.grozni at gmail.com  Thu Feb 12 21:53:18 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 18:53:18 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9446.1234477452.3487.python-list@python.org>
Message-ID: <24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>

There is no need to make it elephant size. Python takes only 14 MB if
I am not wrong. Compare 10 GB of VS package in compare with that.
nothing. Python enthought edition is something really sweet. For
starters, Why does Python not have a build in library to handle
images. I don't get this. Why? PIL is great, but it could really need
some polish. I think that the last programming language I can remind
of that could not handle images, If I am not wrong was QBASIC.

All I hear when I talk to people who own or eork in SW companies is
"Python? Isn't that that small scripting language. This will never
bring a real application." I am tired of hearing this. Even Microsoft
implemented Python. Only because the GUI building I am thinking about
of moving to IronPython. But this great comunity holds me bac on
CPython.

We need better and not out of date libraries and modules. Python was
build because of bad experiences of bad programing languages. I sak
The Python Development team to listen to us users an developers.
listen to our problems.


From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:05:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:05:32 -0200
Subject: getting caller
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
Message-ID: <op.uo9r7iy2x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 19:26:26 -0200, Hamish McKenzie  
<hamish at valvesoftware.com> escribi?:

> so I'm trying to wrap some functionality around execfile but don't want  
> to modify the way it works.  specifically when you call execfile, it  
> automatically grabs globals and locals from the frame the execfile  
> exists in.
>
> so if I wrap execfile in a function, I need a way to reliably get at the  
> calling frame.

Instead of doing that, just pass the desired namespaces to be used; you'll  
want to use locals() and globals() for that.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:12:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:12:58 -0200
Subject: getting caller
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
	<9e680b420902121425y6c20f6abnee3afa4059e772d1@mail.gmail.com>
Message-ID: <op.uo9sjwhfx6zn5v@gabriel2.softlabbsas.com.ar>

(If you aren't replying to the original message, please post an entirely  
*new* one to create a new thread).

En Thu, 12 Feb 2009 20:25:57 -0200, Sambit Samal <sambit2005 at gmail.com>  
escribi?:

>  I need a python script , which binds at a user defind port & sends to  
> other
> enity , which waits at particular port.
> The other enity will respond & Python script should receive that at the
> defined port
> The communication will happen over UDP

See the SocketServer module:
http://docs.python.org/library/socketserver.html
There is a simple UDP server example at the end.

-- 
Gabriel Genellina



From damonwischik at gmail.com  Thu Feb 12 22:16:11 2009
From: damonwischik at gmail.com (Damon)
Date: Thu, 12 Feb 2009 19:16:11 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
Message-ID: <3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>

On Feb 12, 8:15?pm, Philip Semanchuk wrote:
> Let me know when Visual Studio tries to address building GUIs for ?
> Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to ?
> oranges, or chalk and cheese if you're from that part of the world.

Right now.

Use Visual Studio to program a .net application using Windows Forms.
Run it in Mono on Windows, or OS X, or Linux. You can even do it with
IronPython. Or, if you prefer a native look on each application, do it
with wx.net. The great thing about IronPython in .net is that you can
just link in any other .net library in whatever language it's written
in, without needing any sort of wrapper.

Admittedly, I haven't tried this, I'm just going by the hype I read on
the Mono and wx.net pages. Also, you can quibble whether it's Visual
Studio that tries to address this, or the Mono effort.

Damon.


From spacebar265 at gmail.com  Thu Feb 12 22:24:21 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Thu, 12 Feb 2009 19:24:21 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
Message-ID: <c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>

On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>
> >> How would I do separate lines into words without scanning one character
> >> at a time?
>
> > Scan a line at a time, then split each line into words.
>
> > for line in open('myfile.txt'):
> > ? ? words = line.split()
>
> > should work for a particularly simple-minded idea of words.
>
> Or for a slightly less simple minded splitting you could try re.split:
>
> >>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>
> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Using this code how would it load each word into a temporary variable.


From damonwischik at gmail.com  Thu Feb 12 22:39:07 2009
From: damonwischik at gmail.com (Damon)
Date: Thu, 12 Feb 2009 19:39:07 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
Message-ID: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>

On Feb 12, 8:40?pm, Christian Heimes wrote:
> In your opinion all third party are bad. You like to have one monolithic
> block of software. That's a typical Microsoft approach. Lot's of people
> from the open source community prefer small and loosely coupled pieces
> of software. One of the greatest ruler of all time once said "divide et
> impera" -- divide it in small pieces to make it much easier to conquer
> every piece by its own.

"Divide et impera" was a strategy used by the monolithic Roman empire
to divide and subjugate others. I hope that's not what happens to
Python!

The original poster complained about needing to go off to third-party
sites to hunt for software. I wonder if the Python team has ever
considered following the lead of miktex or R, and setting up a
centralized (mirrored) repository of packages? Let anyone who wants,
submit packages.

* Like R, every time there is a new version of Python, the repository
should rebuild the packages, for all supported platforms, and make
available all those that compile cleanly. R also forces you to write
properly structured documentation for every exposed function, before
the repository will accept it.

* Like miktex, when the user does "import foo", the Python interpreter
should (optionally) look for foo in its cached list of packages, and
download the latest version if necessary.

This works fine for R and miktex, and it has made my life very easy.

Damon.


From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:47:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:47:03 -0200
Subject: Why does way_1() obtain the correct list but way_2() gets an
	empty list?
References: <6vi779Fk0ogtU1@mid.individual.net>
Message-ID: <op.uo9t4p00x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 07:07:53 -0200, WP  
<no.i.dont at want.mail.from.spammers.com> escribi?:

> Hello group! This is probably a silly newbie mistake but consider the  
> following program:
>
> import libsbml
>
> def getSBMLModel(biomodel_path):
>      reader = libsbml.SBMLReader()
>
>      sbml_doc = reader.readSBML(biomodel_path)
>      sbml_model = None
>
>      if sbml_doc.getNumErrors() > 0:
>          print 'I couldn\'t read the file %s!' % biomodel_path
>          return None
>      else:
>          sbml_model = sbml_doc.getModel()
>
>      return sbml_doc.getModel() # None if file couldn't be opened

Note that sbml_doc.getModel() is called *twice*, the first one is  
discarded. Probably you want to replace the last line with: return  
sbml_model

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Thu Feb 12 22:56:20 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 03:56:20 -0000
Subject: Scanning a file character by character
In-Reply-To: <c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
Message-ID: <op.uo9uj6dya8ncjz@gnudebst>

On Fri, 13 Feb 2009 03:24:21 -0000, Spacebar265 <spacebar265 at gmail.com>  
wrote:

> On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> > On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>>
>> >> How would I do separate lines into words without scanning one  
>> character
>> >> at a time?
>>
>> > Scan a line at a time, then split each line into words.
>>
>> > for line in open('myfile.txt'):
>> > ? ? words = line.split()
>>
>> > should work for a particularly simple-minded idea of words.
>>
>> Or for a slightly less simple minded splitting you could try re.split:
>>
>> >>> re.split("(\w+)", "The quick brown fox jumps, and falls  
>> over.")[1::2]
>>
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> Using this code how would it load each word into a temporary variable.

Why on earth would you want to?  Just index through the list.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From cournape at gmail.com  Thu Feb 12 23:15:33 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 13:15:33 +0900
Subject: A little bit else I would like to discuss
In-Reply-To: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <5b8d13220902122015g431353bci7e473abb6390ac9a@mail.gmail.com>

On Fri, Feb 13, 2009 at 12:39 PM, Damon <damonwischik at gmail.com> wrote:
> The original poster complained about needing to go off to third-party
> sites to hunt for software. I wonder if the Python team has ever
> considered following the lead of miktex or R, and setting up a
> centralized (mirrored) repository of packages? Let anyone who wants,
> submit packages.

Of course they have, that's what pypi is for. Pypi does not solve all
the problems, though.

>
> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.
>
> * Like miktex, when the user does "import foo", the Python interpreter
> should (optionally) look for foo in its cached list of packages, and
> download the latest version if necessary.
>
> This works fine for R and miktex, and it has made my life very easy.

Yes, R in particular is very nice for this. But it is a complex
problem - and it is even more complex for python compared to R and
miktex, because python is more general. In particular, in R (and
miktex I guess ?), you rarely care about having several versions
installed at the same time (interpreter and/or packages), but in
python, this is often useful. This complicates matter quite a bit.
Having automatic download at import who annoy many users, me included.

For the time being, my opinion is that the only solution for
deployment on desktop apps on windows/mac os X is something like
Enthought distribution, which is self contained. But when you start
installing something outside Enthought, it can become tricky for
"average users" (the one who don't care about the technicalities).

cheers,

David


From pavlovevidence at gmail.com  Thu Feb 12 23:17:50 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 12 Feb 2009 20:17:50 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
Message-ID: <1df828ff-2bd4-4bcb-8c8d-9655dc44fae3@m42g2000yqb.googlegroups.com>

On Feb 9, 11:34?pm, Tim Roberts <t... at probo.com> wrote:
> Carl Banks <pavlovevide... at gmail.com> wrote:
>
> >I'm pretty sure 2.6.1 is compiled with 8.0. ?However, I think the
> >Visual C++ 8.0 uses msvcrt90.dll.
>
> No, the two digits of the DLL match the version number of C++. ?The
> confusion arises because the product is called "Visual Studio 2008", but it
> includes Visual C++ 9.0, and hence msvcrt90.dll. ?People say "VC8" when
> they really mean Visual Studio 2008.
>
> ? Visual Studio 98 ? ?- ?VC++ 6.0
> ? Visual Studio 2002 ?- ?VC++ 7.0
> ? Visual Studio 2003 ?- ?VC++ 7.1
> ? Visual Studio 2005 ?- ?VC++ 8.0
> ? Visual Studio 2008 ?- ?VC++ 9.0

Ah, that explains a lot.


Carl Banks


From banibrata.dutta at gmail.com  Thu Feb 12 23:36:59 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Fri, 13 Feb 2009 10:06:59 +0530
Subject: Regarding Joystick
In-Reply-To: <aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
	<aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
Message-ID: <3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>

AFAIK, the mechanism / API / protocol to actuate the Camera's tilt, pan,
zoom functions are not standardized (happy to be corrected there!), so even
if you find something, it'd most likely be something very specific to a
particular device.
As for Joystick usage, I remember seeing one thread on that couple of months
back, so searching thru the archive should give you leads.

On Fri, Feb 13, 2009 at 3:33 AM, shreyas shah <shreyas22 at gmail.com> wrote:

> Hi ,
>
> I am trying to control the motion of the camera with help of joystick , i
> need some basic functionality where if i move a joystick to left the camera
> moves to the left . Can anyone help me with that ?
>
> Thanks
> Shreyas
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From bkline at rksystems.com  Thu Feb 12 23:43:48 2009
From: bkline at rksystems.com (Bob Kline)
Date: Thu, 12 Feb 2009 23:43:48 -0500
Subject: Change in cgi module's handling of POST requests
In-Reply-To: <gn23u8$q09$1@ger.gmane.org>
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org>
Message-ID: <4994FA84.5070806@rksystems.com>

Joshua Kugler wrote:
>> We just upgraded Python to 2.6 on some of our servers and a number of our
>> CGI scripts broke because the cgi module has changed the way it handles
>> POST requests.  When the 'action' attribute was not present in the form 
>> element on an HTML page the module behaved as if the value of the
>> attribute was the URL which brought the user to the page with the form,
>> but without the query (?x=y...) part.
>
> This does not make sense.  Can you give an example?

Sure.  Here's a tiny repro script:

#!/usr/bin/python
import cgi, xml.sax.saxutils
def quote(me): return me and xml.sax.saxutils.quoteattr(str(me)) or ''
print """\
Content-type: text/html

<html><body><form method='post'><input name='x' value=%s>
<input type='submit'>
</form></body></html>""" % quote(cgi.FieldStorage().getvalue('x'))

####################  end of repro script  ########################

Try it out on this pre-2.6 Python page:

http://www.rksystems.com/cgi-bin/cgi-repro.py?x=y

When the page comes up, click Submit.  Click it several times.  No 
change in the content of the text field, which is populated when the 
page first comes up from the GET request's URL, and then subsequently 
from the POST request's parameters.

For comparison, here's the equivalent Perl page, which behaves the same way:

http://www.rksystems.com/cgi-bin/cgi-repro.pl?x=y

Or PHP; again, same behavior, no matter how many times you click the 
Submit button:

http://www.rksystems.com/cgi-repro.php?x=y

Now try the Python script above from a server where Python has been 
upgraded to version 2.6:

http://mahler.nci.nih.gov/cgi-bin/cgi-repro.py?x=y

Notice that when you click on the Submit button, the field is populated 
with the string representation of the list which FieldStorage.getvalue() 
returns.  Each time you click the submit button you'll see the effect 
recursively snowballing.  This is exactly the same script as the one 
behind the first URL above, byte for byte.

>> Now FieldStorage.getvalue () is 
>> giving the script a list of two copies of the value for some of the
>> parameters (folding in the parameters from the previous request) instead
>> of the single string it used to return for each.
>
> There is a function call to get only one value.  I think it's get_first() or
> some such.

That's true, but risky.  I have no guarantee that the value entered by 
the user on the form will be first on the list.  I might instead get the 
initial value carried over from the URL which brought up the form to 
begin with.  We're working around the problem by modifying the broken 
scripts to explicitly set the action attributes.

>
> Well, the CGI module hasn't had many changes.  There was this bug fix a few
> months back:
>
> http://svn.python.org/view?rev=64447&view=rev

Looks like that was where it happened.

> It is possible that by fixing a bug, they brought the behavior in line with
> what it *should* be.

That's certainly possible.  I'm not contending that Perl and PHP and the 
previous versions of Python all got it right and the new Python is 
wrong.  It could very well be the other way around.[1]  But my 
expectation, based on what I've seen happen over the years with other 
proposed changes to the language and the libraries, was that there would 
have been some (possibly extended) discussion of the risks of breaking 
existing code, and the best way to phase in the change with as little 
sudden breakage as possible.  I haven't been able to find that 
discussion, and I was hoping some kind soul would point me in the right 
direction.

>   Or maybe the browser behavior changed?

Clearly not, as you will see by using the same browser to try out the 
URLs above.  If you look at the HTML source when the page first comes up 
for each of the scripts, you'll see it's the same.  It's the behavior on 
the server (that is, in the Python library module) which changes.

>   The server
> does not care about an "action" attribute.  That only tells the browser
> where to send the data.

Well that's a pretty good formulation of the conclusion you would come 
to based on the behavior of all of Perl, PHP, and (pre-2.6) Python.  And 
intuitively, that's how one (or at least I) would expect things to 
work.  The parameters in the original URL are appropriately used to seed 
initial values in the form when the form is invoked with a GET request, 
but after that point it's hard to see them as anything but history.  But 
that's not how the new version of the cgi module is behaving.  It's 
folding in the parameters it finds in the original URL, which it gets 
from the environment's QUERY_STRING variable, in with the fields it 
parses from the POST request's body.

>   It is possible the browser did not properly format
> a request when there was no "action" attribute.

When the 'action' attribute is not present in the form element, the 
browser implicitly assigns it the value of the original URL which first 
brought up the page with the form.  This browser behavior has not 
changed.  It's doing the same thing no matter which version of which 
language and libraries are used to implement the CGI script (it has no 
idea what those are).  Nor, as far as I have been able to determine, is 
this behavior dependent on which (version of which) browser you're using.

>  Can you provide more details?

I think we should have enough specifics with what I've provided above to 
make it clear what's happening, but if you can think of anything I've 
left out which you think would be useful, let me know and I'll try to 
supply it.

Cheers,
Bob

[1] I haven't yet finished my attempts to parse the relevant RFCs; I 
assumed that the original authors and maintainers of this module (which 
includes the BDFL himself), would have been more adept at that than I 
am, which is one of the reasons I was hoping to find some discussion in 
the mailing list archives of the discussion of the proposed change in 
the module's behavior.



From mohitranka at gmail.com  Thu Feb 12 23:54:47 2009
From: mohitranka at gmail.com (mohit_ranka)
Date: Thu, 12 Feb 2009 20:54:47 -0800 (PST)
Subject: NNTPlib encoding issue
Message-ID: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>

I am getting unknown encoding like, "=?Utf-8?B?QWRyaWFu?=
<Adrian at discussions.microsoft.com>" (quotes for clarity) for name of
the author from nntplib module. which seems like an encoding issue
with NNTPLib module.

What should i do to get author name information in human readable
format.

Thanks and regards,
Mohit Ranka


From benjamin.kaplan at case.edu  Fri Feb 13 00:04:04 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 00:04:04 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
	<3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
Message-ID: <ec96e1390902122104i29f55944q125248d51277d1ad@mail.gmail.com>

On Thu, Feb 12, 2009 at 10:16 PM, Damon <damonwischik at gmail.com> wrote:

> On Feb 12, 8:15 pm, Philip Semanchuk wrote:
> > Let me know when Visual Studio tries to address building GUIs for
> > Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to
> > oranges, or chalk and cheese if you're from that part of the world.
>
> Right now.
>
> Use Visual Studio to program a .net application using Windows Forms.
> Run it in Mono on Windows, or OS X, or Linux. You can even do it with
> IronPython. Or, if you prefer a native look on each application, do it
> with wx.net. The great thing about IronPython in .net is that you can
> just link in any other .net library in whatever language it's written
> in, without needing any sort of wrapper.
>

Windows.Forms isn't native in OS X or Linux though. To get a native look,
you need to use the Cocoa and GTK C-sharp bindings, which means you're not
using Visual Studio. wx is actually a wrapper around the native components,
so it will look nice on every platform that supports it (well, except KDE
because of the Qt license issue).


>
> Admittedly, I haven't tried this, I'm just going by the hype I read on
> the Mono and wx.net pages. Also, you can quibble whether it's Visual
> Studio that tries to address this, or the Mono effort.
>
> Damon.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Fri Feb 13 00:09:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:09:42 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <gn2van$tjs$1@ger.gmane.org>

Damon wrote:

> The original poster complained about needing to go off to third-party
> sites to hunt for software. I wonder if the Python team has ever

The 'Python team' is everyone who volunteers to help.
How about you?

> considered following the lead of miktex or R, and setting up a
> centralized (mirrored) repository of packages? Let anyone who wants,
> submit packages.

> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.
> 
> * Like miktex, when the user does "import foo", the Python interpreter
> should (optionally) look for foo in its cached list of packages, and
> download the latest version if necessary.
> 
> This works fine for R and miktex, and it has made my life very easy.

If you have an idea on how to improve the current package index, help 
improve it.  Appoint yourself the 'test with new release' manager.

tjr



From tjreedy at udel.edu  Fri Feb 13 00:12:56 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:12:56 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<mailman.9446.1234477452.3487.python-list@python.org>
	<24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
Message-ID: <gn2vgp$ueh$1@ger.gmane.org>

azrael wrote:

> We need better and not out of date libraries and modules. Python was
> build because of bad experiences of bad programing languages. I sak
> The Python Development team to listen to us users an developers.
> listen to our problems.

I ask you to help update a module or package that you care about.
Join the team and contribute.

tjr



From tjreedy at udel.edu  Fri Feb 13 00:23:34 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:23:34 -0500
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
Message-ID: <gn304o$vkn$1@ger.gmane.org>

W. eWatson wrote:
>  From Diez above.
> What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> pyhton-file your app is in. That's all that there is to it.
> 
> So this is the absolute truth? No wiggle room? One can never use a 
> Tkinter program with IDLE, and execute it successfully. So IDLE doesn't 
> issue a standard warning that says, "Get out of here with your Tkinter 
> program, it will fail when you try to run it here. You have entered 
> Tkinter hell. Good-bye."

Re-read my post about kids fighting to control a television.  Maybe they 
work together, maybe they crash the TV.  Hard to predict.

***ANY*** Python program that tries to grab and control the same 
resources that TK does may conflict with it.  There is no way that IDLE 
can have a list of, for instance, all event-grabbing mainloop programs.



From sudhandra_selvi at yahoo.co.in  Fri Feb 13 01:18:05 2009
From: sudhandra_selvi at yahoo.co.in (sudhandra selvi)
Date: Fri, 13 Feb 2009 11:48:05 +0530 (IST)
Subject: similar_text  in python
Message-ID: <647605.23303.qm@web8905.mail.in.yahoo.com>

Hi 
Does anyone know if Python has a function like similar_text in PHP. It
 compares two strings and returns a percentage for the match. Anyone
 know of anything like this in Python and would be willing to send
 along an example?

thanks
selvi



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From apt.shansen at gmail.com  Fri Feb 13 01:37:47 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 22:37:47 -0800
Subject: hpw to convert a linux python script ?
In-Reply-To: <gn20f7$d0e$1@ger.gmane.org>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<mailman.9352.1234385290.3487.python-list@python.org>
	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
	<gn20f7$d0e$1@ger.gmane.org>
Message-ID: <7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>

> # Absolute path to the directory that holds media.
> # Example: "/home/media/media.lawrence.com/"
> MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'
>
> Note that most Windows APIs allow you to use the forward slash as a
> delimiter. It's mostly the command line and Windows Explorer that are
> snotty about insisting on the backslash.

Idle curiosity, why do you prefer that to:

MEDIA_ROOT = os.path.join(fsroot, 'Projects', 'PytDj', 'images')

Not arguing that one is actually better then the other, just curious.

In my own environment we have grown a whole big filesystem abstraction
layer because we have to be able to address the same resources on
network volumes in the same client on multiple OS's (mainly windows
and mac presently, but a linux client has long been a
consideration),... and on the mac having to sometimes use mac paths
(":this:that:other") and sometimes posix paths ("/this/that/other")
depending on what API layer I'm poking at in a given point of view...
so personally I just end up being mildly curious how everyone else
handles paths and such.

Cuz it was quite a bit of a pain early on.

--S


From brianlong at cox.net  Fri Feb 13 01:44:54 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Thu, 12 Feb 2009 22:44:54 -0800 (PST)
Subject: Break large file down into multiple files
Message-ID: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>

New to python.... I have a large file that I need to break up into
multiple smaller files. I need to break the large file into sections
where there are 65535 lines and then write those sections to seperate
files.  I am familiar with opening and writing files, however, I am
struggling with creating the sections and writing the different
sections to their own files.

Thanks

B


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 01:52:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 04:52:32 -0200
Subject: similar_text  in python
References: <647605.23303.qm@web8905.mail.in.yahoo.com>
Message-ID: <op.uo92puhkx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 04:18:05 -0200, sudhandra selvi  
<sudhandra_selvi at yahoo.co.in> escribi?:

> Does anyone know if Python has a function like similar_text in PHP. It
>  compares two strings and returns a percentage for the match. Anyone
>  know of anything like this in Python and would be willing to send
>  along an example?

See the difflib module.
http://docs.python.org/library/difflib.html

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 02:02:52 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 05:02:52 -0200
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <op.uo9262iyx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianlong at cox.net>  
escribi?:

> New to python.... I have a large file that I need to break up into
> multiple smaller files. I need to break the large file into sections
> where there are 65535 lines and then write those sections to seperate
> files.  I am familiar with opening and writing files, however, I am
> struggling with creating the sections and writing the different
> sections to their own files.

This function copies at most n lines from fin to fout:

def copylines(fin, fout, n):
   for i, line in enumerate(fin):
     fout.write(line)
     if i+1>=n: break

Now you have to open the source file, create new files as needed and  
repeatedly call the above function until the end of source file. You'll  
have to enhace it bit, to know whether there are remaining lines or not.

-- 
Gabriel Genellina



From brianlong at cox.net  Fri Feb 13 02:43:02 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Thu, 12 Feb 2009 23:43:02 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<mailman.9474.1234508570.3487.python-list@python.org>
Message-ID: <a158ea7e-0ab9-4dae-a217-7004859f13e9@m16g2000vbp.googlegroups.com>

On Feb 12, 11:02?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianl... at cox.net> ?
> escribi?:
>
> > New to python.... I have a large file that I need to break upinto
> > multiple smallerfiles. I need to break the large fileintosections
> > where there are 65535 lines and then write thosesectionsto seperate
> >files. ?I am familiar with opening and writingfiles, however, I am
> > struggling with creating thesectionsand writing the different
> >sectionsto their ownfiles.
>
> This function copies at most n lines from fin to fout:
>
> def copylines(fin, fout, n):
> ? ?for i, line in enumerate(fin):
> ? ? ?fout.write(line)
> ? ? ?if i+1>=n: break
>
> Now you have to open the source file, create newfilesas needed and ?
> repeatedly call the above function until the end of source file. You'll ?
> have to enhace it bit, to know whether there are remaining lines or not.
>
> --
> Gabriel Genellina

Gabriel ::

Thanks for the direction.  Do I simply define fin, fout and n as
variables above the def copylines(fin, fout, n): line?

Would it look like this?

fin = open('C:\Path\file')
fout = 'C:\newfile.csv')
n = 65535

def copylines(fin, fout, n):
    for i, line in enumerate(fin):
 ? ? ?fout.write(line)
 ? ? ?if i+1>=n: break

Thanks

B


From ivanov.maxim at gmail.com  Fri Feb 13 03:02:56 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Fri, 13 Feb 2009 00:02:56 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com>

> New to python.... I have a large file that I need to break up into
> multiple smaller files. I need to break the large file into sections
> where there are 65535 lines and then write those sections to seperate
> files.

If your lines are variable-length, then look at itertools recipes.

from itertools import izip_longest

def grouper(n, iterable, fillvalue=None):
    "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

with open("/file","r") as f:
    for lines in grouper(65535,f,""):
        data_to_write = '\n'.join(lines).rstrip("\n")
        ...
        <write data where you need it here>
        ...



From mail at microcorp.co.za  Fri Feb 13 03:27:11 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 13 Feb 2009 10:27:11 +0200
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <01e001c98dba$310340a0$0d00a8c0@hendrik>

"azrael" <jurni at gmail.com> wrote:


> To be honest, in compare to Visual Studio, Gui Builders for wx widgets
> are really bad. Also completly for python there is not one good
> GuiBuilder. The only one I have seen that would come near VS was
> BoaConstructor, But the number of Bugs is just horrific. Too bad that
> no one is developing it further.

What are these horrific bugs - I was forced to use Boa on a project
recently, and I did not notice any - In fact, I was impressed because
everything that was there, seemed to be working properly.

- Hendrik



From anders.mackey at gmail.com  Fri Feb 13 03:28:09 2009
From: anders.mackey at gmail.com (Fisherking)
Date: Fri, 13 Feb 2009 00:28:09 -0800 (PST)
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
	<mailman.9415.1234460188.3487.python-list@python.org>
Message-ID: <00402c5a-725f-4941-b335-f80fc63a781c@u13g2000yqg.googlegroups.com>

Thank you all for your answers! I must say I'm really impressed by the
willing to help and the quick responses in this group (since it is my
first post)!

I solved the problem using SQL-queries. I added a id, the same for
each item in a chain (two or more similar posts) and just updated the
database for each unique post. I had to do this anyway and I think it
is the simplest and quickest way!

thanks again!




From tim.wintle at teamrubber.com  Fri Feb 13 03:33:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 13 Feb 2009 08:33:49 +0000
Subject: thread. question
In-Reply-To: <gmq23p$dt3$1@ger.gmane.org>
References: <1234187238.7630.34.camel@tim-laptop>
	<gmpgbp$60o$1@ger.gmane.org> <1234193642.7630.63.camel@tim-laptop>
	<gmq23p$dt3$1@ger.gmane.org>
Message-ID: <1234514029.16298.5.camel@tim-laptop>

On Mon, 2009-02-09 at 21:02 +0100, Christian Heimes wrote:
> The module was renamed to _thread to stop people from using it directly.
> The extension module is the interface to some low level types and
> functions. Especially the usage of thread.start_new_thread is
> problematic, since it bypasses Python's high level threading API.

Ok, I'll take that in - I'll have a look around the threading module to
see what it is that it bypasses so I can persuade myself that _thread is
bad ...

> For the rest I have to agree with Jean-Paul. If you need performance
> don't use threads! Threads and performance are orthogonal -- sometimes
> they are even contradictorily.

I've taken that in too - "performance" here is over a non-uniform
workload (essentially a web server), but I'm probably best offloading
just about all the work to a secondary process (already passed most of
it) and dealing with requests in a completely synchronous process.

Tim



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 03:34:42 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 09:34:42 +0100
Subject: something wrong with isinstance
In-Reply-To: <8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <49953096$0$15292$426a74cc@news.free.fr>

redbaron a ?crit :
> Don't really sure, but try to define your class as new-style one.

isinstance() works as well with classic classes.


From mail at timgolden.me.uk  Fri Feb 13 03:39:01 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 13 Feb 2009 08:39:01 +0000
Subject: Invoking CutePDF from within Python
In-Reply-To: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
Message-ID: <499531A5.5010805@timgolden.me.uk>

John Henry wrote:
> I have a need to invoke CutePDF from within a Python program.  
> 
> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".

> Private Sub Print_PDF()
> 
>      lRetVal = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\Custom PDF
> Printer",  _
>                     0&, vbNullString, REG_OPTION_NON_VOLATILE,
> KEY_ALL_ACCESS, _
>                     0&, hKey, lRetVal)
>      sValue = "C:\Sample.pdf"
>      RegSetValueExString hKey, "OutputFile", 0&, REG_SZ, sValue, Len
> (sValue)
>      sValue = "1"
>      RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
> (sValue)
> 
>      Dim worddoc As Word.Document
>      Set worddoc = wordapp.Documents.Open("C:\Sample.doc")
>      wordapp.ActivePrinter = "Custom PDF Printer"
>      wordapp.PrintOut
>      worddoc.Close
> 
>      sValue = "0"
>      RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
> (sValue)
>      RegCloseKey (hKey)


Direct translation (untested since I don't have CutePDF installed)

<code>
import win32api
import win32con
import win32com

hKey, ret = win32api.RegCreateKeyEx (
  win32con.HKEY_CURRENT_USER, 
  "Software\Custom PDF Printer",
  win32con.KEY_ALL_ACCESS
)
win32api.RegSetValueEx (hKey, "OutputFile", None, win32con.REG_SZ, r"c:\sample.pdf")
win32api.RegSetValueEx (hKey, "BypassSaveAs", None, win32con.REG_SZ, r"1")

word = win32com.client.gencache.EnsureDispatch ("Word.Application")
doc = word.Documents.Open (r"c:\sample.doc")
doc.ActivePrinter = "Custom PDF Printer"
word.Printout ()
doc.Close ()

win32api.RegSetValueEx (hKey, "BypassSaveAs", None, win32con.REG_SZ, r"0")

</code>


FWIW, I usually generate PDFs by printing to a Postscript printer
(some random Apple Laserthingy) and then using Ghostscript to
do the conversion. I'm happy to post if you're interested.

TJG




From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 03:50:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 09:50:15 +0100
Subject: something wrong with isinstance
In-Reply-To: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <4995343c$0$4817$426a74cc@news.free.fr>

maksym.kaban at gmail.com a ?crit :
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
> 

Others already addressed your problem (cf Paul and Diez answers). I'll 
just allow myself to point a couple other potential problems with your code:

> ##worldmap module
> class GeoMap:
>     cells = []
>     activerow = 0
>     activecol = 0


Attributes defined at the class level are *class* attributes, shared by 
all instances of the class - that is, all instances will access the one 
same 'cells' list. Instance attributes are canonically created in the 
initialize method (__init__) that is automagically called on 
instanciation. IOW, you want to replace the above lines with:

      def __init__(self):
          self.cells = []
          self.activerow = 0
          self.activecol = 0


>     def addCell(self, acell):
>         if len(self.cells) == 0:

An empty list evals to False in a boolean context, so the above can be 
simply expressed as:
           if not self.cells:

>           self.cells.append([])
>           self.activerow = 0
>         acell.col = self.activerow
>         acell.row = self.activecol
>         self.cells[self.activerow].append(acell)
>         self.activecol += 1
> 
>     def addRow(self):
>         self.cells.append([])
>         self.activerow += 1;
>         self.activecol = 0;
> 
> class GeoMapCell:
>     neighbours = (None, None, None, None, None, None, )
>     col = 0
>     row = 0

Same remark as above. You want to move all this code to the __init__ method.



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 04:10:34 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 10:10:34 +0100
Subject: Problem with objects copying each other in memory
In-Reply-To: <mailman.9448.1234477815.3487.python-list@python.org>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<mailman.9448.1234477815.3487.python-list@python.org>
Message-ID: <499538ff$0$4837$426a34cc@news.free.fr>

Cameron Pulsford a ?crit :

> Thanks, that did it! Why is that the case though? Or rather, why do the 
> assignments to temp.x and temp.y not effect the self.x and self.y? How 
> come I only run into the problem with the list?


Because there's a huge difference between binding an object to a name 
and mutating an object ?

First point: Python's "assignment"  is really a binding of a name and an 
object _reference_ in a given namespace. Think of namespaces as 
name=>object_ref dictionnaries. This implies that "assignement" never 
copies anything. So when you do:

 >>> list1 = []
 >>> list2 = list1

the second line actually creates *another* name=>object pair referencing 
the *same* list object. IOW, list1 and list2 are two named references to 
a single object:

  >>> list1 is list2
True
 >>> id(list1) == id(list2)
True

So whether you access it thru name 'list1' or 'list2', if you mutate the 
object (like append/remove/replace an element of the list), you'll see 
the result thru the other name as well:

 >>> list1.append('foo')
 >>> list2.append('bar')
 >>> list1
['foo', 'bar']
 >>> list2
['foo', 'bar']
 >>>

Note FWIW that list subscripting (somelist[x] = y) is really a method 
call (somelist.__setitem__(x, y)) in disguise, so the same reasonning 
applies.

Now *rebinding* a name is a different thing. It makes the name refer to 
another object, but has no impact on other name=>object bindings 
refering to the previously bound object, ie:

 >>> list2 = ['hou', 'lala']

Now list2 points to a newly created list object. This doesn't impact 
list1 of course:

 >>> list1
['foo', 'bar']
 >>> list1 is list2
False
 >>> id(list1) == id(list2)
False
 >>>


(snip)


From martijnsteenwijk at gmail.com  Fri Feb 13 04:30:48 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Fri, 13 Feb 2009 01:30:48 -0800 (PST)
Subject: Problem building Python extension
Message-ID: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>

Hi all,

I'm trying to build my first python extensionon a win32 system. I
followed the description in http://starship.python.net/crew/mwh/toext/your-first-extension.html,
but after running

C:\Python26\python first-setup.py build_ext -i

nothing seems to happen and no file first.pyd is produced.

The result from the cmd is the following:
running build_ext
building `first` extension
error: None

Does anyone have an idea what's going wrong?

Thanks for replies in advance,
Martijn


From marco at sferacarta.com  Fri Feb 13 04:49:53 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 13 Feb 2009 10:49:53 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <5nbll.29481$8Z.20616@tornado.fastwebnet.it>

azrael wrote:

> I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......

If the standard library where that huge, python 3.0 would have been late 
by a couple of years.

> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

I totally want to write my 10 lines of great image processing or speech 
recognition software, but it's not how development works.


From cournape at gmail.com  Fri Feb 13 04:53:30 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 18:53:30 +0900
Subject: Problem building Python extension
In-Reply-To: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
Message-ID: <5b8d13220902130153k9b119m5b58088350b87dba@mail.gmail.com>

On Fri, Feb 13, 2009 at 6:30 PM,  <martijnsteenwijk at gmail.com> wrote:
> Hi all,
>
> I'm trying to build my first python extensionon a win32 system. I
> followed the description in http://starship.python.net/crew/mwh/toext/your-first-extension.html,
> but after running
>
> C:\Python26\python first-setup.py build_ext -i
>
> nothing seems to happen and no file first.pyd is produced.
>
> The result from the cmd is the following:
> running build_ext
> building `first` extension
> error: None

It is a bug in distutils - you reminded me that I did not report it :)
. IIRC, it is caused by the lack of a recognized installation VS 2008.
You should either install VS 2008 (the express vesion is free) or make
sure your VS 2008 is correctly installed.

Building python 2.6 extensions with mingw is possible as well, but I
think you need to build your own mingw (because python 2.6 requires
msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.

cheers,

David


From pavlovevidence at gmail.com  Fri Feb 13 05:07:58 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 13 Feb 2009 02:07:58 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>

On Feb 12, 10:49?am, redbaron <ivanov.ma... at gmail.com> wrote:
> Don't really sure, but try to define your class as new-style one.
> Like
> class GeoMap(object):
> ? ?...

Well, the OP said he was using Python 3.0, where all classes are new-
style classes.

But that brings up another very slight possibility, though not a very
likely one in this case: the behavior of isinstance can be
customized.  It can happen unbeknownst to a user who subclasses a
class that does that.


Carl Banks


From s.selvamsiva at gmail.com  Fri Feb 13 05:16:00 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Fri, 13 Feb 2009 15:46:00 +0530
Subject: Levenshtein word comparison -performance issue
Message-ID: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>

Hi all,

I need some help.
I tried to find top n(eg. 5) similar words for a given word, from a
dictionary of 50,000 words.
I used python-levenshtein module,and sample code is as follow.

def foo(searchword):
    disdict={}
    for word in self.dictionary-words:
                   distance=Levenshtein.ratio(searchword,word)
                   disdict[word]=distance
    """
     sort the disdict dictionary by values in descending order
    """
    similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)

    return similarwords[:5]

foo() takes a search word and compares it with dictionary of 50,000 and
assigns each word a value(lies between 0 to 1).
Then after sorting in descending order it returns top 5 similar words.

The problem is, it* takes long time* for processing(as i need to pass more
search words within a loop),i guess the code could be improved to work
efficiently.Your suggestions are welcome...
-- 
Yours,
S.Selvam
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From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:16:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:16:47 -0200
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<mailman.9474.1234508570.3487.python-list@python.org>
	<a158ea7e-0ab9-4dae-a217-7004859f13e9@m16g2000vbp.googlegroups.com>
Message-ID: <op.upab590jx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 05:43:02 -0200, brianrpsgt1 <brianlong at cox.net>  
escribi?:

> On Feb 12, 11:02?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianl... at cox.net> ?
>> escribi?:
>>
>> > New to python.... I have a large file that I need to break upinto
>> > multiple smallerfiles. I need to break the large fileintosections
>> > where there are 65535 lines and then write thosesectionsto seperate
>> >files. ?I am familiar with opening and writingfiles, however, I am
>> > struggling with creating thesectionsand writing the different
>> >sectionsto their ownfiles.
>>
>> This function copies at most n lines from fin to fout:
>>
>> def copylines(fin, fout, n):
>> ? ?for i, line in enumerate(fin):
>> ? ? ?fout.write(line)
>> ? ? ?if i+1>=n: break
>>
>> Now you have to open the source file, create newfilesas needed and ?
>> repeatedly call the above function until the end of source file. You'll  
>> ?
>> have to enhace it bit, to know whether there are remaining lines or not.
>>
>> --
>> Gabriel Genellina
>
> Gabriel ::
>
> Thanks for the direction.  Do I simply define fin, fout and n as
> variables above the def copylines(fin, fout, n): line?
>
> Would it look like this?
>
> fin = open('C:\Path\file')
> fout = 'C:\newfile.csv')
> n = 65535

Warning: see this FAQ entry  
http://www.python.org/doc/faq/general/#why-can-t-raw-strings-r-strings-end-with-a-backslash
>
> def copylines(fin, fout, n):
>     for i, line in enumerate(fin):
>  ? ? ?fout.write(line)
>  ? ? ?if i+1>=n: break

Almost. You have to *call* the copylines function, not just define it.  
After calling it with: copylines(fin, fout, 65535), you'll have the  
*first* chunk of lines copied. So you'll need to create a second file,  
call the copylines function again, create a third file, call... You'll  
need some kind of loop, and a way to detect when to stop and break out of  
it.

The copylines function already knows what happened (whether there are more  
lines to copy or not) so you should enhace it and return such information  
to the caller.

It isn't so hard, after working out the tutorial (linked from  
http://wiki.python.org/moin/BeginnersGuide ) you'll know enough Python to  
finish this program.

If you have some previous programming experience, Dive into Python (linked  
 from the Beginners Guide above) is a good online book.

Feel free to come back when you're stuck with something.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:27:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:27:35 -0200
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
Message-ID: <op.upacn9zjx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks <pavlovevidence at gmail.com>  
escribi?:

> Well, the OP said he was using Python 3.0, where all classes are new-
> style classes.
>
> But that brings up another very slight possibility, though not a very
> likely one in this case: the behavior of isinstance can be
> customized.  It can happen unbeknownst to a user who subclasses a
> class that does that.

Really? I didn't know that -- how do you do that?

-- 
Gabriel Genellina



From pavlovevidence at gmail.com  Fri Feb 13 05:36:05 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 13 Feb 2009 02:36:05 -0800 (PST)
Subject: thread. question
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
	<mailman.9156.1234193645.3487.python-list@python.org>
Message-ID: <dc9c7a38-69d5-4d51-a4b2-e012f7a67971@u18g2000pro.googlegroups.com>

On Feb 9, 7:34?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> Thanks for both replies,
>
> On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
> > You shouldn't use the thread module directly. It's not meant to be used
> > by a user. Please stick to the threading module. You won't notice a
> > slowdown, trust me :)
>
> I'm aware that thread is being renamed to _thread in python 3.0, but is
> it being depricated or anything like that?
>
> This is for an app that has been running for quite a long time and it's
> now time for fairly heavy optimisations as load is increasing (Believe
> me, I wouldn't have been looking at the C otherwise) - so I'll see if I
> do notice any effect with threading.

The threading module is likely to be slightly slower when spawning new
threads, because the Thread class has a bit of overhead that allows
you to do things like thread.join().

Simple locking will be same speed whether you use the threading or
thread module, because threading.Lock and thread.acquire return the
same type of object.  This is an implementation detail, though.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:42:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:42:19 -0200
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
Message-ID: <op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>  
escribi?:

> I need some help.
> I tried to find top n(eg. 5) similar words for a given word, from a
> dictionary of 50,000 words.
> I used python-levenshtein module,and sample code is as follow.
>
> def foo(searchword):
>     disdict={}
>     for word in self.dictionary-words:
>                    distance=Levenshtein.ratio(searchword,word)
>                    disdict[word]=distance
>     """
>      sort the disdict dictionary by values in descending order
>     """
>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>
>     return similarwords[:5]

You may replace the last steps (sort + slice top 5) by heapq.nlargest - at  
least you won't waste time sorting 49995 irrelevant words...
Anyway you should measure the time taken by the first part (Levenshtein),  
it may be the most demanding. I think there is a C extension for this,  
should be much faster than pure Python calculations.

-- 
Gabriel Genellina



From __peter__ at web.de  Fri Feb 13 05:43:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 13 Feb 2009 11:43:03 +0100
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
	<mailman.9481.1234520852.3487.python-list@python.org>
Message-ID: <gn3irc$mss$02$1@news.t-online.com>

Gabriel Genellina wrote:

> En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks <pavlovevidence at gmail.com>
> escribi?:
> 
>> Well, the OP said he was using Python 3.0, where all classes are new-
>> style classes.
>>
>> But that brings up another very slight possibility, though not a very
>> likely one in this case: the behavior of isinstance can be
>> customized.  It can happen unbeknownst to a user who subclasses a
>> class that does that.
> 
> Really? I didn't know that -- how do you do that?
 
>>> class Type(type):
...     def __instancecheck__(self, other): return True
...
>>> class A(metaclass=Type): pass
...
>>> class B: pass
...
>>> isinstance(B(), A)
True

See also 

http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass

I doubt that this is the source of the OP's troubles, though.

Peter


From martijnsteenwijk at gmail.com  Fri Feb 13 05:58:29 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Fri, 13 Feb 2009 02:58:29 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
Message-ID: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>

On 13 feb, 10:53, David Cournapeau <courn... at gmail.com> wrote:
> On Fri, Feb 13, 2009 at 6:30 PM, ?<martijnsteenw... at gmail.com> wrote:
> > Hi all,
>
> > I'm trying to build my first python extensionon a win32 system. I
> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
> > but after running
>
> > C:\Python26\python first-setup.py build_ext -i
>
> > nothing seems to happen and no file first.pyd is produced.
>
> > The result from the cmd is the following:
> > running build_ext
> > building `first` extension
> > error: None
>
> It is a bug in distutils - you reminded me that I did not report it :)
> . IIRC, it is caused by the lack of a recognized installation VS 2008.
> You should either install VS 2008 (the express vesion is free) or make
> sure your VS 2008 is correctly installed.
>
> Building python 2.6 extensions with mingw is possible as well, but I
> think you need to build your own mingw (because python 2.6 requires
> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>
> cheers,
>
> David

Thanks a lot for your reply. I downloaded & installed Visual C# 2008
express, but unfortunately this doesn't change anything in running the
setup file. Unfortunately, still no pyd file is produced...

Did I something wrong?


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:58:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:58:41 -0200
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org>
	<4994FA84.5070806@rksystems.com>
Message-ID: <op.upad330lx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 02:43:48 -0200, Bob Kline <bkline at rksystems.com>  
escribi?:
> Joshua Kugler wrote:
>>> We just upgraded Python to 2.6 on some of our servers and a number of  
>>> our
>>> CGI scripts broke because the cgi module has changed the way it handles
>>> POST requests.  When the 'action' attribute was not present in the  
>>> form element on an HTML page the module behaved as if the value of the
>>> attribute was the URL which brought the user to the page with the form,
>>> but without the query (?x=y...) part.

> [1] I haven't yet finished my attempts to parse the relevant RFCs; I  
> assumed that the original authors and maintainers of this module (which  
> includes the BDFL himself), would have been more adept at that than I  
> am, which is one of the reasons I was hoping to find some discussion in  
> the mailing list archives of the discussion of the proposed change in  
> the module's behavior.

I noticed this change in behaviour too, and indeed, it is due to  
http://bugs.python.org/issue1817
But I could not find any RFC/standard/reccomendation/whatever that clearly  
states *what* should happen with a POST request directed to an URI having  
a query string itself. So I could not say "it's a bug" -- it's just...  
annoying in these cases (although it might be useful in some other cases,  
I think)
A posible workaround is to ensure all forms have an action attribute, and  
that it doesn't contain any query string.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:59:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:59:01 -0200
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
	<mailman.9481.1234520852.3487.python-list@python.org>
	<gn3irc$mss$02$1@news.t-online.com>
Message-ID: <op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:43:03 -0200, Peter Otten <__peter__ at web.de>  
escribi?:
> Gabriel Genellina wrote:
>> En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks  
>> <pavlovevidence at gmail.com>
>> escribi?:
>>> But that brings up another very slight possibility, though not a very
>>> likely one in this case: the behavior of isinstance can be
>>> customized.  It can happen unbeknownst to a user who subclasses a
>>> class that does that.
>>
>> Really? I didn't know that -- how do you do that?
>
>>>> class Type(type):
> ...     def __instancecheck__(self, other): return True
> ...
>>>> class A(metaclass=Type): pass
> ...
>>>> class B: pass
> ...
>>>> isinstance(B(), A)
> True
>
> See also
>
> http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass

Ah, ok. Isn't menctioned in the main documentation though.

-- 
Gabriel Genellina



From greg.ewing at canterbury.ac.nz  Fri Feb 13 06:11:02 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sat, 14 Feb 2009 00:11:02 +1300
Subject: ANN: Supy 1.1
Message-ID: <mailman.9496.1234537239.3487.python-announce-list@python.org>

SuPy 1.1 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Added explicit ways of calling method names ending in '?' or '!'. Python
method names 'is_xxx' and 'xxx_ip' map to Ruby 'xxx?' and 'xxx!' respectively.
The plain name 'xxx' can still be used where there is no ambiguity.

- Ruby true and false are now converted to Python True and False.

- Ruby methods expecting a block can be called from Python by passing
a callable Python object with the keyword 'body'.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From notvalid2 at sbcglobal.net  Fri Feb 13 06:13:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 03:13:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9470.1234502626.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
Message-ID: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>

Terry Reedy wrote:
> W. eWatson wrote:
>>  From Diez above.
>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>> run it
>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>> pyhton-file your app is in. That's all that there is to it.
>>
>> So this is the absolute truth? No wiggle room? One can never use a 
>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>> doesn't issue a standard warning that says, "Get out of here with your 
>> Tkinter program, it will fail when you try to run it here. You have 
>> entered Tkinter hell. Good-bye."
> 
> Re-read my post about kids fighting to control a television.  Maybe they 
> work together, maybe they crash the TV.  Hard to predict.
> 
> ***ANY*** Python program that tries to grab and control the same 
> resources that TK does may conflict with it.  There is no way that IDLE 
> can have a list of, for instance, all event-grabbing mainloop programs.
> 
OK, enough tinkering with the code and others matters on my end trying to 
find a work around. Somehow after much successful use of IDLE's execution 
facility, I've stepped on an invisible banana peel. I think it's evident 
that I'm not going around this problem easily with the IDLE execution 
attempts, and that another solution is required.

First, I think somewhere up the thread someone suggested that Active 
pythonWin is not dependent upon Tk, correct? Therefore, it is immune from 
such problems, correct?

Second, maybe I missed it above, but when I posted the output from the 
program that showed the failure, was there anything that said, "IDLE 
problem" or would even give a clue that's the culprit?

Finally, we can probably agree that I can continue to use IDLE for editing 
and syntax checking, but to "guarantee" successful execution of the program, 
I can just double-click on the py file in my folder. Perhaps there is a 
better way than clicking on it in the folder. For example, putting it on the 
desktop. As I look at the folder, previous copies only differ by a digit, I 
can easily find myself executing an earlier version, differing as Dev4, to 
Dev5 at the end of each name.

Let me ask this. When I install Active Python, am I getting something beyond 
their interface? That is, does executing the code there result in using the 
same python interpreter that is used by IDLE? My use of their editor has 
been somewhat exasperating. It does not seem as friendly as the IDLE editor.

I still find it bizarre that the original creator of this program can spend 
months using IDLE to develop this program, and that I've spent maybe 10 days 
recently now adding to it without having much, if any, problem with IDLE and 
the programs execution within IDLE. I asked him almost a year ago what tool 
he used. IDLE, was the reply. Maybe it was really IDLE with no execution 
from inside IDLE. I'll ask him.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From cournape at gmail.com  Fri Feb 13 06:15:03 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 20:15:03 +0900
Subject: Problem building Python extension
In-Reply-To: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
Message-ID: <5b8d13220902130315m433f25day88e9df65c24d9f66@mail.gmail.com>

On Fri, Feb 13, 2009 at 7:58 PM,  <martijnsteenwijk at gmail.com> wrote:
> On 13 feb, 10:53, David Cournapeau <courn... at gmail.com> wrote:
>> On Fri, Feb 13, 2009 at 6:30 PM,  <martijnsteenw... at gmail.com> wrote:
>> > Hi all,
>>
>> > I'm trying to build my first python extensionon a win32 system. I
>> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
>> > but after running
>>
>> > C:\Python26\python first-setup.py build_ext -i
>>
>> > nothing seems to happen and no file first.pyd is produced.
>>
>> > The result from the cmd is the following:
>> > running build_ext
>> > building `first` extension
>> > error: None
>>
>> It is a bug in distutils - you reminded me that I did not report it :)
>> . IIRC, it is caused by the lack of a recognized installation VS 2008.
>> You should either install VS 2008 (the express vesion is free) or make
>> sure your VS 2008 is correctly installed.
>>
>> Building python 2.6 extensions with mingw is possible as well, but I
>> think you need to build your own mingw (because python 2.6 requires
>> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>>
>> cheers,
>>
>> David
>
> Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> express, but unfortunately this doesn't change anything in running the
> setup file. Unfortunately, still no pyd file is produced...

I am not 100 % confident, but I think the problem is that for Visual
Studio express, you need to build the extension in a Visual Studio
shell (in the VS 2008 express menu). If that still does not work, I
will check on a windows VM (I need to do the bug report anyway).

cheers,

David


From carlos.mora at atisa.es  Fri Feb 13 06:15:13 2009
From: carlos.mora at atisa.es (cm)
Date: Fri, 13 Feb 2009 12:15:13 +0100
Subject: Invoking CutePDF from within Python
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
Message-ID: <gn3knj$34a$1@aioe.org>

Hi John,
> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".
I can't answer you question but let me make a suggestion: Try 
PdfCreator. It lets you control all the process using an activex 
control. It has events to tell you when the jobs has finish, or report 
you of eventual errors.

Download it from sf.net, and look into the samples.

Best regards,

Carlos.


From cwitts at gmail.com  Fri Feb 13 06:19:52 2009
From: cwitts at gmail.com (Chris)
Date: Fri, 13 Feb 2009 03:19:52 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com>
Message-ID: <61a8c5b2-9b81-4b51-a2c3-f9e43b01586f@m42g2000yqb.googlegroups.com>

On Feb 13, 10:02?am, redbaron <ivanov.ma... at gmail.com> wrote:
> > New to python.... I have a large file that I need to break up into
> > multiple smaller files. I need to break the large file into sections
> > where there are 65535 lines and then write those sections to seperate
> > files.
>
> If your lines are variable-length, then look at itertools recipes.
>
> from itertools import izip_longest
>
> def grouper(n, iterable, fillvalue=None):
> ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> ? ? args = [iter(iterable)] * n
> ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> with open("/file","r") as f:
> ? ? for lines in grouper(65535,f,""):
> ? ? ? ? data_to_write = '\n'.join(lines).rstrip("\n")
> ? ? ? ? ...
> ? ? ? ? <write data where you need it here>
> ? ? ? ? ...

I really would not recommend joining a large about of lines, that will
take some times.

fIn = open(input_filename, 'rb')
chunk_size = 65535

for i,line in enumerate(fIn):
    if not i:   # First Line in the File, create a file to start
writing to
        filenum = '%04d'%(i%chunk_size)+1
        fOut = open('%s.txt'%filenum, 'wb')
    if i and not i % chunk_size:   # Once at the chunk_size close the
old file object and create a new one
        fOut.close()
        filenum = '%04d'%(i%chunk_size)+1
        fOut = open('%s.txt'%filenum, 'wb')
    if not i % 1000:
        fOut.flush()
    fOut.write(line)

fOut.close()
fIn.close()


From cwitts at gmail.com  Fri Feb 13 06:36:11 2009
From: cwitts at gmail.com (Chris)
Date: Fri, 13 Feb 2009 03:36:11 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com> 
	<61a8c5b2-9b81-4b51-a2c3-f9e43b01586f@m42g2000yqb.googlegroups.com>
Message-ID: <fa879417-a68e-4c03-9d96-f03a21d84b12@t11g2000yqg.googlegroups.com>

On Feb 13, 1:19?pm, Chris <cwi... at gmail.com> wrote:
> On Feb 13, 10:02?am, redbaron <ivanov.ma... at gmail.com> wrote:
>
>
>
> > > New to python.... I have a large file that I need to break up into
> > > multiple smaller files. I need to break the large file into sections
> > > where there are 65535 lines and then write those sections to seperate
> > > files.
>
> > If your lines are variable-length, then look at itertools recipes.
>
> > from itertools import izip_longest
>
> > def grouper(n, iterable, fillvalue=None):
> > ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> > ? ? args = [iter(iterable)] * n
> > ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> > with open("/file","r") as f:
> > ? ? for lines in grouper(65535,f,""):
> > ? ? ? ? data_to_write = '\n'.join(lines).rstrip("\n")
> > ? ? ? ? ...
> > ? ? ? ? <write data where you need it here>
> > ? ? ? ? ...
>
> I really would not recommend joining a large about of lines, that will
> take some times.
>
> fIn = open(input_filename, 'rb')
> chunk_size = 65535
>
> for i,line in enumerate(fIn):
> ? ? if not i: ? # First Line in the File, create a file to start
> writing to
> ? ? ? ? filenum = '%04d'%(i%chunk_size)+1
> ? ? ? ? fOut = open('%s.txt'%filenum, 'wb')
> ? ? if i and not i % chunk_size: ? # Once at the chunk_size close the
> old file object and create a new one
> ? ? ? ? fOut.close()
> ? ? ? ? filenum = '%04d'%(i%chunk_size)+1
> ? ? ? ? fOut = open('%s.txt'%filenum, 'wb')
> ? ? if not i % 1000:
> ? ? ? ? fOut.flush()
> ? ? fOut.write(line)
>
> fOut.close()
> fIn.close()

Whoops, day-dreaming mistake.  Use "filenum = '%04d'%(i/chunk_size)+1"
and not i%chunk_size.


From python.list at tim.thechases.com  Fri Feb 13 06:38:06 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 13 Feb 2009 05:38:06 -0600
Subject: Break large file down into multiple files
In-Reply-To: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <49955B9E.2070209@tim.thechases.com>

> New to python.... I have a large file that I need to break up
> into multiple smaller files. I need to break the large file
> into sections where there are 65535 lines and then write those
> sections to seperate files.  I am familiar with opening and
> writing files, however, I am struggling with creating the
> sections and writing the different sections to their own
> files.

While this thread has offered many nice Python solutions, the 
"split" command is pretty standard on most Linux boxes:

   bash$ split -l 65535 infile.txt

which will do what you describe.  You can read the man page for 
more details.

So if you just want a fast route to a goal rather than going 
through the learning process (I'm all for learning how to do it 
too), this may be a quick answer.

-tkc





From lists at cheimes.de  Fri Feb 13 06:45:30 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 13 Feb 2009 12:45:30 +0100
Subject: Problem building Python extension
In-Reply-To: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
Message-ID: <gn3mgq$sme$1@ger.gmane.org>

martijnsteenwijk at gmail.com wrote:
> Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> express, but unfortunately this doesn't change anything in running the
> setup file. Unfortunately, still no pyd file is produced...
> 
> Did I something wrong?

Yeah, you installed the C# environment. Python is written in C, so you
have to get Visual Studio C++ 2008. However a recent version of MinGW32
is sufficient to build most extensions.

Christian



From juergen.riemer at gmail.com  Fri Feb 13 06:49:05 2009
From: juergen.riemer at gmail.com (JuergenRiemer)
Date: Fri, 13 Feb 2009 03:49:05 -0800 (PST)
Subject: get wget log message
Message-ID: <6eb958bd-3d9b-4388-99c0-944268914be1@x10g2000yqk.googlegroups.com>

Hi,

I didn't succeed to do the following:
I download a PDF file via wget yet I am not interested in the file
itself but the wget verbose output (log message) e.g. download speed,
total size, etc.
I know I could use < -o log.txt > and then read from that file yet
this seems not very elegant.
I am new to both wget/linux and python and am struggling for quite
some time now, could anyone help me here?

 thx a lot
 Juergen



From gnewsg at gmail.com  Fri Feb 13 07:00:17 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 13 Feb 2009 04:00:17 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
Message-ID: <d2bb736e-46ee-489a-a770-38683d76dc91@m40g2000yqh.googlegroups.com>

On Feb 13, 10:53?am, David Cournapeau <courn... at gmail.com> wrote:
> On Fri, Feb 13, 2009 at 6:30 PM, ?<martijnsteenw... at gmail.com> wrote:
> > Hi all,
>
> > I'm trying to build my first python extensionon a win32 system. I
> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
> > but after running
>
> > C:\Python26\python first-setup.py build_ext -i
>
> > nothing seems to happen and no file first.pyd is produced.
>
> > The result from the cmd is the following:
> > running build_ext
> > building `first` extension
> > error: None
>
> It is a bug in distutils - you reminded me that I did not report it :)
> . IIRC, it is caused by the lack of a recognized installation VS 2008.
> You should either install VS 2008 (the express vesion is free) or make
> sure your VS 2008 is correctly installed.
>
> Building python 2.6 extensions with mingw is possible as well, but I
> think you need to build your own mingw (because python 2.6 requires
> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>
> cheers,
>
> David

I already reported that:
http://bugs.python.org/issue4931


--- Giampaolo
http://code.google.com/p/pyftpdlib


From juergen.riemer at gmail.com  Fri Feb 13 07:02:37 2009
From: juergen.riemer at gmail.com (JuergenRiemer)
Date: Fri, 13 Feb 2009 04:02:37 -0800 (PST)
Subject: get wget log message
References: <6eb958bd-3d9b-4388-99c0-944268914be1@x10g2000yqk.googlegroups.com>
Message-ID: <ba79e7dc-cddb-4b7b-9719-fe646ca2b8dc@h16g2000yqj.googlegroups.com>

> itself but the wget verbose output (log message) e.g. download speed,
> total size, etc.

ahh I got it 1 minute after sending this post grrrr

commands.getstatusoutput(cmd)

Juergen


From paul at boddie.org.uk  Fri Feb 13 07:03:44 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 13 Feb 2009 04:03:44 -0800 (PST)
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org> 
	<4994FA84.5070806@rksystems.com>
	<mailman.9483.1234522720.3487.python-list@python.org>
Message-ID: <9436b83e-5283-466a-a1d9-0822bcca37e7@h20g2000yqn.googlegroups.com>

On 13 Feb, 11:58, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
> I noticed this change in behaviour too, and indeed, it is due to ?http://bugs.python.org/issue1817
> But I could not find any RFC/standard/reccomendation/whatever that clearly ?
> states *what* should happen with a POST request directed to an URI having ?
> a query string itself. So I could not say "it's a bug" -- it's just... ?
> annoying in these cases (although it might be useful in some other cases, ?
> I think)

The issue of distinguishing between query-originating parameters and
form-originating parameters has been around for a very long time, and
in my own work, especially where the cgi module has been used, I've
been careful to distinguish between the two types and to merge them
only if this is desired (get_fields vs. get_fields_from_path and
get_fields_from_body in WebStack). If the cgi module has now changed
its behaviour to just merge the two data sources, I can imagine that a
few applications aren't going to be happy any more, and since I doubt
that I'm the only one to take the approach I've just described, I can
imagine that I'm not alone in regarding this "bug fix" as more of a
regression if it has been done in a way which does not preserve the
behaviour of unmodified existing code.

Paul


From martin at marcher.name  Fri Feb 13 07:08:02 2009
From: martin at marcher.name (Martin)
Date: Fri, 13 Feb 2009 13:08:02 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <gn26k5$3ak$1@ger.gmane.org>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
	<gn26k5$3ak$1@ger.gmane.org>
Message-ID: <5fa6c12e0902130408k2bf075f0x138ffcd93b1df92b@mail.gmail.com>

2009/2/12 Christian Heimes <lists at cheimes.de>:
> Martin wrote:
> [typos igored as requested ;)]
>
>> How does "small and agile" work with "batteries included"?
>
> The Python slogan says "batteries included", not "fusion reactor included".

I'd be fine with a fusion reactor, my objections would be if skynet
was included :)

> The rules are:
>
> ...
>
> It takes at least 1.5 years to get a new feature into an extension and
> at least 3 years to remove or change a feature. That's a major shop
> stopper for every fast moving piece of Python software.

True, I thought a bit more about it and decided for myself to be happy
with the way it is since I prefer quality to features :)


/Martin




-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From google at mrabarnett.plus.com  Fri Feb 13 07:25:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 12:25:24 +0000
Subject: NNTPlib encoding issue
In-Reply-To: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>
References: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>
Message-ID: <499566B4.8080608@mrabarnett.plus.com>

mohit_ranka wrote:
> I am getting unknown encoding like, "=?Utf-8?B?QWRyaWFu?=
> <Adrian at discussions.microsoft.com>" (quotes for clarity) for name of
> the author from nntplib module. which seems like an encoding issue
> with NNTPLib module.
> 
> What should i do to get author name information in human readable
> format.
> 
The original text was encoded in UTF-8 and then into base-64:

=?Utf-8?B?QWRyaWFu?=
   ^^^^^ UTF-8

=?Utf-8?B?QWRyaWFu?=
         ^ Base-64

So that's:

 >>> "QWRyaWFu".decode("base-64").decode("Utf-8")
u'Adrian'


From gideon.smeding at gmail.com  Fri Feb 13 08:13:09 2009
From: gideon.smeding at gmail.com (gideon)
Date: Fri, 13 Feb 2009 05:13:09 -0800 (PST)
Subject: An executable operational semantics for Python
References: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>
	<b11993c2-b37d-4cb0-9e2c-018c70532671@t3g2000yqa.googlegroups.com>
Message-ID: <c8e6cac0-0d57-4fe7-95c7-1e83ba97f337@f20g2000yqg.googlegroups.com>

On Feb 12, 5:14?pm, bearophileH... at lycos.com wrote:
> gideon:
>
> > I've recently finished my Master's thesis on the semantics of Python.
> > In my thesis I define the semantics of Python by rewriting an abstract
> > machine. The sources that are used to produce my thesis can also be
> > compiled into a working interpreter. Hence I call it an 'executable'
> >semantics.
>
> Can it be used for some useful purpose?

The interpreter? Probably not. The semantics. Yes.


From berend at dotmpe.com  Fri Feb 13 08:58:03 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Fri, 13 Feb 2009 14:58:03 +0100
Subject: sgmllib parser keeps old tag data?
Message-ID: <20090213135803.GB2168@iris.furrow.ath.cx>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Hi everyone,

I read the source, made numerous tests, but SGMLParser's keeps returning *tag* data 
from previous parser instances. I'm totally confused why.. The content data it
returns is ok.

E.g.::

    sp = MyParser()
    sp.feed('<test><t />Test</test>')
    print sp.content, sp.markup
    sp.close()

    sp = MyParser()
    sp.feed('<xml>\n</xml>\r\n')
    print sp.content, sp.markup
    sp.close()

gives::

    ('Test', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}]) 
    ('\n\r\n', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}, {'xml': ({}, (0, 1))}])

It keeps the tags from the previous session, while i'm sure the stack etc.
should be clean..

Any ideas?


regards, Berend

- ----

import sgmllib


class MyParser(sgmllib.SGMLParser):

	content = ''		
	markup = []
	span_stack = []

	def handle_data(self, data):
		self.content += data

	def unknown_starttag(self, tag, attr):
		stack = { tag: ( dict(attr), ( len(self.content), ) ) }
		self.span_stack.append(stack)

	def unknown_endtag(self, tag):
		prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]

		if tag:
			# close all tags on stack until it finds a matching end tag
			# XXX: need to return to LEVEL, not same tag name
			while tag != prev_tag:
				span = { prev_tag: ( attr, ( offset, 0 ) ) }
				self.markup.append( span )

				prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]

		length = len( self.content ) - offset
		span = { tag: ( attr, ( offset, length ) ) }
		self.markup.append( span )

	def do_unknown_tag(self, tag, attr):
		assert not tag and not attr, "do_unknown_tag %s, %s" % (tag, attr)

	def close(self):
		sgmllib.SGMLParser.close(self)
		self.content = ''
		self.markup = []
		self.span_stack = []						


def parse_data(data):
	sp = MyParser()
	sp.feed(data)
	r = sp.content, sp.markup
	sp.close()
	return r

print parse_data('<test><t />Test</test>')
print parse_data('<xml>\n</xml>\r\n')
print parse_data('<sgml><s>Test 3</s></sgml>')



- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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k3eiwfD0yw6t+giXJy1nako=
=afE6
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From news123 at free.fr  Fri Feb 13 09:04:33 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 15:04:33 +0100
Subject: best set of modules for web automation without javascript
Message-ID: <49957df1$0$15145$426a74cc@news.free.fr>

Hi,


I'd like to do some web automation with python 2.5
- https:
- a cookiejar
- some forms to be filled in


what is the best set of modules.

As far as I understood, there is httplib, but it seems (if I understood
well) to be incoompatible with cookielib

I'm a newcomer to webautomation with python and would be thankful for
good suggestions.


I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
forgot the name) to handle parsing and filling in Forms.

thanks in advance for any pointers opinions


N


From goon12 at gmail.com  Fri Feb 13 09:23:21 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Fri, 13 Feb 2009 09:23:21 -0500
Subject: best set of modules for web automation without javascript
In-Reply-To: <49957df1$0$15145$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <6a2ccd190902130623ra571796o62d0143a1ddca6bb@mail.gmail.com>

On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
> Hi,
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
> what is the best set of modules.

I have automated some testing of our product, using it's web UI with
Python with urllib2 and urrlib. I don't actually fill in the forms, I
just recreate the post and set the values of the post variables (so I
don't get any form validation).

Check out:
urllib2.build_opener
urllib2.HTTPCookieProcessor
urllib2.Request


From andrew at acooke.org  Fri Feb 13 09:27:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 13 Feb 2009 11:27:51 -0300
Subject: sgmllib parser keeps old tag data?
References: <20090213135803.GB2168@iris.furrow.ath.cx>
Message-ID: <gn401g$u76$1@ger.gmane.org>


you are declaring class variables, not instance variables.  you need to
declare these in an __init__ method.  RTFM. 
http://docs.python.org/tutorial/classes.html#a-first-look-at-classes

Berend van Berkum wrote:
> class MyParser(sgmllib.SGMLParser):
> 
> content = ''
> markup = []
> span_stack = []




From google at mrabarnett.plus.com  Fri Feb 13 09:31:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 14:31:40 +0000
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <20090213135803.GB2168@iris.furrow.ath.cx>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
Message-ID: <4995844C.7080104@mrabarnett.plus.com>

Berend van Berkum wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> Hi everyone,
> 
> I read the source, made numerous tests, but SGMLParser's keeps returning *tag* data 
> from previous parser instances. I'm totally confused why.. The content data it
> returns is ok.
> 
> E.g.::
> 
>     sp = MyParser()
>     sp.feed('<test><t />Test</test>')
>     print sp.content, sp.markup
>     sp.close()
> 
>     sp = MyParser()
>     sp.feed('<xml>\n</xml>\r\n')
>     print sp.content, sp.markup
>     sp.close()
> 
> gives::
> 
>     ('Test', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}]) 
>     ('\n\r\n', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}, {'xml': ({}, (0, 1))}])
> 
> It keeps the tags from the previous session, while i'm sure the stack etc.
> should be clean..
> 
> Any ideas?
> 
> 
> regards, Berend
> 
> - ----
> 
> import sgmllib
> 
> 
> class MyParser(sgmllib.SGMLParser):
> 
> 	content = ''		
> 	markup = []
> 	span_stack = []
> 
These are in the _class_ itself, so they will be shared by all its
instances. You should so something like this instead:

	def __init__(self):
		self.content = ''
		self.markup = []
		self.span_stack = []

> 	def handle_data(self, data):
> 		self.content += data
> 
> 	def unknown_starttag(self, tag, attr):
> 		stack = { tag: ( dict(attr), ( len(self.content), ) ) }
> 		self.span_stack.append(stack)
> 
> 	def unknown_endtag(self, tag):
> 		prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]
> 
> 		if tag:
> 			# close all tags on stack until it finds a matching end tag
> 			# XXX: need to return to LEVEL, not same tag name
> 			while tag != prev_tag:
> 				span = { prev_tag: ( attr, ( offset, 0 ) ) }
> 				self.markup.append( span )
> 
> 				prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]
> 
> 		length = len( self.content ) - offset
> 		span = { tag: ( attr, ( offset, length ) ) }
> 		self.markup.append( span )
> 
> 	def do_unknown_tag(self, tag, attr):
> 		assert not tag and not attr, "do_unknown_tag %s, %s" % (tag, attr)
> 
> 	def close(self):
> 		sgmllib.SGMLParser.close(self)
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []						
> 
> 
> def parse_data(data):
> 	sp = MyParser()
> 	sp.feed(data)
> 	r = sp.content, sp.markup
> 	sp.close()
> 	return r
> 
> print parse_data('<test><t />Test</test>')
> print parse_data('<xml>\n</xml>\r\n')
> print parse_data('<sgml><s>Test 3</s></sgml>')
> 



From python at bdurham.com  Fri Feb 13 09:45:08 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 13 Feb 2009 09:45:08 -0500
Subject: Invoking CutePDF from within Python
In-Reply-To: <499531A5.5010805@timgolden.me.uk>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
Message-ID: <1234536308.14311.1300203191@webmail.messagingengine.com>

Tim,

> FWIW, I usually generate PDFs by printing to a Postscript printer (some random Apple Laserthingy) and then using Ghostscript to do the conversion. I'm happy to post if you're interested.

If its not too much bother, I would be interested in learning how you're
interfacing to Python to Ghostscript.

Regards,
Malcolm


From berend at dotmpe.com  Fri Feb 13 09:51:01 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Fri, 13 Feb 2009 15:51:01 +0100
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <4995844C.7080104@mrabarnett.plus.com>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<4995844C.7080104@mrabarnett.plus.com>
Message-ID: <20090213145101.GC2168@iris.furrow.ath.cx>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, Feb 13, 2009 at 02:31:40PM +0000, MRAB wrote:
> Berend van Berkum wrote:
> >
> >import sgmllib
> >
> >
> >class MyParser(sgmllib.SGMLParser):
> >
> >	content = ''		
> >	markup = []
> >	span_stack = []
> >
> These are in the _class_ itself, so they will be shared by all its
> instances. You should so something like this instead:
> 
> 	def __init__(self):
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []
> 

Yes.. tested that and SGMLParser won't let me override __init__, 
(SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) call).
Tried some but not the following:
with a differently named init function and one boolean class var 'initialized'
it can check 'if self.initialized' in front of each handler. Does the trick.

Confusion dissolved :)
thanks.

- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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Version: GnuPG v1.4.6 (GNU/Linux)

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Ms1QZ9IoB2s6RJ+tdXJtzfs=
=itBb
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From mail at timgolden.me.uk  Fri Feb 13 09:54:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 13 Feb 2009 14:54:33 +0000
Subject: Invoking CutePDF from within Python
In-Reply-To: <1234536308.14311.1300203191@webmail.messagingengine.com>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
	<1234536308.14311.1300203191@webmail.messagingengine.com>
Message-ID: <499589A9.3060404@timgolden.me.uk>

python at bdurham.com wrote:
> Tim,
> 
>> FWIW, I usually generate PDFs by printing to a Postscript printer (some random Apple Laserthingy) and then using Ghostscript to do the conversion. I'm happy to post if you're interested.
> 
> If its not too much bother, I would be interested in learning how you're
> interfacing to Python to Ghostscript.

Really boring, I'm afraid. Just popen and an .exe:

http://pastebin.com/m461bf8f2

(There are a few dependencies I haven't shown but I
hope the approach is obvious; happy to explain / supply
details)

TJG


From python at bdurham.com  Fri Feb 13 10:07:51 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 13 Feb 2009 10:07:51 -0500
Subject: Invoking CutePDF from within Python
In-Reply-To: <499589A9.3060404@timgolden.me.uk>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
	<1234536308.14311.1300203191@webmail.messagingengine.com>
	<499589A9.3060404@timgolden.me.uk>
Message-ID: <1234537671.19677.1300207371@webmail.messagingengine.com>

Tim,

> http://pastebin.com/m461bf8f2

Wonderful! That's enough to get me started. Thank you very much.

Cheers,
Malcolm


From news123 at free.fr  Fri Feb 13 10:09:05 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 16:09:05 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <mailman.9491.1234535004.3487.python-list@python.org>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
Message-ID: <49958d11$0$12422$426a74cc@news.free.fr>


Hi Joel,

Thanks,
This (the urllib2 methods you combined with cookielib) is what I am
currently trying to do.

I would just like to retrieve all the field names and default values of
a form. (Some forms are huge) and wondered thus whether there's already
a python module parsing a html documents for forms , form fields and
field vaules, returning an objcet. that could be modified and posted.


bye

N



Joe Riopel wrote:
> On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
>> Hi,
>> I'd like to do some web automation with python 2.5
>> - https:
>> - a cookiejar
>> - some forms to be filled in
>> what is the best set of modules.
> 
> I have automated some testing of our product, using it's web UI with
> Python with urllib2 and urrlib. I don't actually fill in the forms, I
> just recreate the post and set the values of the post variables (so I
> don't get any form validation).
> 
> Check out:
> urllib2.build_opener
> urllib2.HTTPCookieProcessor
> urllib2.Request


From marco at sferacarta.com  Fri Feb 13 10:12:24 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 13 Feb 2009 16:12:24 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49958d11$0$12422$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <s5gll.29966$8Z.25363@tornado.fastwebnet.it>

News123 wrote:

> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.

http://wwwsearch.sourceforge.net/ClientForm/
http://wwwsearch.sourceforge.net/mechanize/


From james at agentultra.com  Fri Feb 13 10:17:48 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 13 Feb 2009 07:17:48 -0800
Subject: [ANN] TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
Message-ID: <87k57uv00z.fsf@agentultra.com>

J Kenneth King <james at agentultra.com> writes:

> I tend to work a lot with Trac for project management and have always
> found the browser interface to be a productivity killer. I always
> wanted a simple command-line interface to Trac, but having never found
> one I found a little free time and got off my laurels to make one.
>
> TracShell 0.1 is an early release, but it works. So far you can only
> query and view tickets, but planned updates include the obvious
> ability to create and edit tickets. Future plans will allow browsing
> of comments, change histories, attachments, and so forth.
>
> Please consider it really beta. The code needs a little tidying up
> around the edges. If you find any bugs, please report them and I'll
> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>
> http://code.google.com/p/tracshell/
>
> Cheers.

Just added the ability to create tickets, more features forthcoming.

I highly recommend anyone using this tool to stick to the latest svn
versions. I'll package the feature-complete stables going forward.

Cheers.


From james at agentultra.com  Fri Feb 13 10:21:04 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 13 Feb 2009 07:21:04 -0800
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<mailman.9428.1234467669.3487.python-list@python.org>
	<aedfee1e-d7e2-41fc-88d4-1cf3fd8484cd@h16g2000yqj.googlegroups.com>
Message-ID: <87fxiiuzvj.fsf@agentultra.com>

gc_ottawa at yahoo.ca writes:

> ......I come from Delphi, and compared to Delphi, even Visual Studio
>> vanishes ;-)
> ...........I don't even notice the difference between Delphi (which
> I'm still using)
>> and wxPython.
>>
>> I think this story happened to other people to,
>> so instead of putting a lot of effort in designing and maintaining a GUI
>> builders,
>> it might be better to choose another solution.
>>
>> btw, the idea I used, can be seen here]http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
>> and the code can be found herehttp://code.google.com/p/pylab-works/downloads/list
>>
>> cheers,
>> Stef
>
> You know, 10 or more years ago both Borland and Microsoft got it right
> when they incorporated a GUI with an IDE in their Delphi and Visual
> Basic products. As wonderful as the Python language is, it is very
> much a work in progress when compared to the ease of use of the
> aforementioned products. These products revolutionized the industry
> with their "Rapid Applications Development" (RAD).
>
> Python reminds me of a toolbox filled with a multitude of single use
> tools when all you need is a Skilsaw and a combination screwdriver.
> Gord

... So use the combination screwdriver.

Python isn't all things to all people. It is what it is.


From google at mrabarnett.plus.com  Fri Feb 13 10:41:52 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 15:41:52 +0000
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <20090213145101.GC2168@iris.furrow.ath.cx>
References: <20090213135803.GB2168@iris.furrow.ath.cx>	<4995844C.7080104@mrabarnett.plus.com>
	<20090213145101.GC2168@iris.furrow.ath.cx>
Message-ID: <499594C0.9020509@mrabarnett.plus.com>

Berend van Berkum wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On Fri, Feb 13, 2009 at 02:31:40PM +0000, MRAB wrote:
>> Berend van Berkum wrote:
>>> import sgmllib
>>>
>>>
>>> class MyParser(sgmllib.SGMLParser):
>>>
>>> 	content = ''		
>>> 	markup = []
>>> 	span_stack = []
>>>
>> These are in the _class_ itself, so they will be shared by all its
>> instances. You should so something like this instead:
>>
>> 	def __init__(self):
>> 		self.content = ''
>> 		self.markup = []
>> 		self.span_stack = []
>>
> 
> Yes.. tested that and SGMLParser won't let me override __init__, 
> (SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) call).

OK, so SGMLParser needs to be initialised:

	def __init__(self):
		sgmllib.SGMLParser.__init__(self)
		self.content = ''
		self.markup = []
		self.span_stack = []

> Tried some but not the following:
> with a differently named init function and one boolean class var 'initialized'
> it can check 'if self.initialized' in front of each handler. Does the trick.
> 
> Confusion dissolved :)
> thanks.
> 


From synnovefredericks at gmail.com  Fri Feb 13 10:52:57 2009
From: synnovefredericks at gmail.com (synarcane)
Date: Fri, 13 Feb 2009 07:52:57 -0800 (PST)
Subject: Developer needed for Open Source Django/Pinax on-line community
Message-ID: <d3de6261-b330-44b2-abcd-b4f921d457d4@h20g2000yqn.googlegroups.com>

The Hub is a global community of innovators from every profession,
background and culture working at 'new frontiers' to tackle the
world's
most pressing social, cultural and environmental challenges.  The Hub
has over 1000 members hotdesking in stunning spaces around the world.
The Hub aims to give its members the tools and resources they need to
take their ideas from inception to scale. To this end we are building
an
Open Source online platform to enable Hub members to collaborate
virtually. We have identified Pinax as the platform for building this
over the next few months.

The Hub+ team is the team which provides technology to Hubs globally.
We
are looking for an experienced and enthusiastic Python programmer to
work on a Django/Pinax project in a team committed to Open Source
software and open innovation. If you are interested in inspiring
initiatives and enjoy working in an innovative environment we'd like
you
to join our small team to help build the Hub's ambitious technical
infrastructure.

There will be plenty of opportunities to get involved in other
cutting
edge technical projects with The Hub including real-time comet based
services, network visualisation, collaborative real-time mind-
mapping,
guided navigation, VOIP triggering, and video messaging.

Required
- Experienced Python developer
- Knowledge of Django development
- Javascript
- Basic HTML/CSS
- Based in London (or willing to move)

Preferred*
- Experience in Pinax
- JQuery / YUI
- Active in Open Source communities
- Interest in open innovation
- Twisted
- Comet / Orbited

Please send an e-mail by 23rd February 2009, to synnove.fredericks at the-
hub.net, with some samples of your work, your CV and tell us why you
are interested in joining us.


From andrew at acooke.org  Fri Feb 13 10:54:45 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 13 Feb 2009 12:54:45 -0300
Subject: sgmllib parser keeps old tag data?
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<gn401g$u76$1@ger.gmane.org>
Message-ID: <gn454e$io3$1@ger.gmane.org>


Sorry, this reply was delayed (trying to use usenet...) and so now seems
(even more) bad tempered than needed.  Andrew

andrew cooke wrote:
> you are declaring class variables, not instance variables.  you need to
> declare these in an __init__ method.  RTFM.
> http://docs.python.org/tutorial/classes.html#a-first-look-at-classes
> 
> Berend van Berkum wrote:
>> class MyParser(sgmllib.SGMLParser):
>> 
>> content = ''
>> markup = []
>> span_stack = []
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list




From zpeteljac at gmaljo.com  Fri Feb 13 11:06:55 2009
From: zpeteljac at gmaljo.com (Kurioz)
Date: Fri, 13 Feb 2009 17:06:55 +0100
Subject: Python knapsack problem
Message-ID: <gn45qd$t67$1@ss408.t-com.hr>

Hi,

I got the assignment to solve the knapsack problem in Python. I have to find 
the solution to put items in a sack (I have only one item A, B and C) which 
maxWeight can't be larger than 6 kilograms.  Solution of this problem should 
be A and C but the only solution I'm getting is B and C which aren't true 
because weight of the B and C is 7 kilograms which is heavier than the 
maxWeight.

If anyone could point me what am I doing wrong I'd be very grateful! Thanks 
in advance!

Code:

#1st array element is weight of an item, and 2nd array element is value
A=[2.0,1.0]
B=[3.0,7.0]
C=[4.0,8.0]
#Checking the values per one kilo
vA=A[1]/A[0]
vB=B[1]/B[0]
vC=C[1]/C[0]
maxWeight=0
print vA,vB,vC
#Checking the values
while maxWeight<6:
    if int(vA)>int(vB) and int(vA)>int(vC):
        maxWeight=maxWeight+A[0]
        vA=0
        print maxWeight

    elif int(vB)>int(vA) and int(vB)>int(vC):
        maxWeight=maxWeight+B[0]
        print maxWeight

    else:
        vC=0
        maxWeight=maxWeight+C[0]
        print maxWeight 



From nick at craig-wood.com  Fri Feb 13 11:31:56 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 13 Feb 2009 10:31:56 -0600
Subject: Escaping my own chroot...
References: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>
	<mailman.9339.1234370135.3487.python-list@python.org>
Message-ID: <slrngpb67h.aq5.nick@irishsea.home.craig-wood.com>

Jean-Paul Calderone <exarkun at divmod.com> wrote:
>  On Wed, 11 Feb 2009 09:31:56 -0600, Nick Craig-Wood <nick at craig-wood.com> wrote:
> >r0g <aioe.org at technicalbloke.com> wrote:
> >>  I'm writing a linux remastering script in python where I need to chroot
> >>  into a folder, run some system commands and then come out and do some
> >>  tidying up, un-mounting proc & sys etc.
> >>
> >>  I got in there with os.chroot() and I tried using that to get back out
> >>  but that didn't work so... is my script trapped in there forever now or
> >>  is there an un-hacky way to escape?
> >
> >No!
> 
>  If you still have root in the chroot (and you need root to get in there, so
>  it's not implausible that you will), then you can get out.  Googling for
>  "escape chroot" turns up lots of hits.  This page contains a fairly simple,
>  explicit description of how to get out of a chroot:
> 
>     http://www.bpfh.net/simes/computing/chroot-break.html
> 
>  See the bulleted list in the "Breaking chroot()" section.  Since you also
>  control the process before the chroot happens, breaking out is even simpler
>  in your case (just open / before you chroot in the first place).  forking
>  before doing the chroot may still be a good idea, but it's not the only
>  solution.

I admit it can be done, but I'm not sure it isn't hacky!

#!/usr/bin/python

"""
Enter a chroot and escape again

Run as root
"""

import os
import sys

def ls(path):
    """List the path"""
    print "Directory listing of %r" % path
    for f in os.listdir(path):
        print ">>", f

def main():
    if len(sys.argv) < 2:
        print >>sys.stderr, "Need directory to chroot to as an argument"
        raise SystemExit(1)
    chroot_dir = sys.argv[1]
    print "Opening root"
    root = os.open("/", os.O_RDONLY)
    print "Before chroot"
    ls("/")
    print "Chrooting to %r" % chroot_dir
    os.chroot(chroot_dir)
    ls("/")
    print "Breaking the chroot"
    os.fchdir(root)
    for i in range(100):
        os.chdir("..")
    os.chroot(".")
    ls("/")
    os.close(root)

if __name__ == "__main__":
    main()


I ran this

$ mkdir chroot_test
$ touch chroot_test/in_the_chroot
$ sudo ./chroot_test.py chroot_test

And it produced this

Opening root
Before chroot
Directory listing of '/'
>> lost+found
>> home
>> bin
>> boot
>> proc
>> dev
>> etc
[snip]
Chrooting to 'chroot_test'
Directory listing of '/'
>> in_the_chroot
Breaking the chroot
Directory listing of '/'
>> lost+found
>> home
>> bin
>> boot
>> proc
>> dev
>> etc
[snip]


-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From david at abbottdavid.com  Fri Feb 13 12:03:42 2009
From: david at abbottdavid.com (David)
Date: Fri, 13 Feb 2009 12:03:42 -0500
Subject: *nix tail -f multiple log files with Thread
Message-ID: <4995A7EE.2000302@abbottdavid.com>

Hi everyone,

I copied a program from C to track multiple log files. I would like to 
be able to print a label when a log file is updated. Here is the program;

<code>
#!/usr/bin/python
from threading import Thread
import subprocess
from Queue import Queue

num_threads = 3
queue = Queue()
logfiles = ["/var/log/messages",
         "/var/log/apache2/access_log",
         "/var/log/apache2/error_log"]

def logtailer(i, q,):
     while True:
         lfile = q.get()
         sudo = "sudo"
         tail = "tail"
         arg = "-f"
         ret = subprocess.call([sudo, tail, arg, lfile])
         q.task_done()

for i in range(num_threads):
     worker = Thread(target=logtailer, args=(i, queue))
     worker.setDaemon(True)
     worker.start()

for lfile in logfiles:
     queue.put(lfile)

queue.join()
</code>

And here is a sample of the output;

[Fri Feb 13 08:58:48 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
[Fri Feb 13 08:58:51 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
Feb 13 09:02:26 opteron sudo:    david : TTY=pts/4 ; PWD=/home/david ; 
USER=root ; COMMAND=/bin/tail -f /var/log/apache2/error_log
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session opened for 
user root by david(uid=0)
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session closed for 
user root
Feb 13 09:10:01 opteron cron[10633]: (root) CMD (test -x 
/usr/sbin/run-crons && /usr/sbin/run-crons )
Feb 13 09:18:33 opteron su[10678]: Successful su for root by david
Feb 13 09:18:33 opteron su[10678]: + pts/6 david:root
Feb 13 09:18:33 opteron su[10678]: pam_unix(su:session): session opened 
for user root by david(uid=1000)
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/favicon.ico HTTP/1.1" 200 894
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/lib/speller/spellChecker.js HTTP/1.1" 200 15980
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET / HTTP/1.1" 200 13718
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/styles.php HTTP/1.1" 200 30709

I would like to be able to add a label like;

<error_log>
[Fri Feb 13 08:58:48 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
[Fri Feb 13 08:58:51 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
<syslog>
Feb 13 09:02:26 opteron sudo:    david : TTY=pts/4 ; PWD=/home/david ; 
USER=root ; COMMAND=/bin/tail -f /var/log/apache2/error_log
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session opened for 
user root by david(uid=0)
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session closed for 
user root
Feb 13 09:10:01 opteron cron[10633]: (root) CMD (test -x 
/usr/sbin/run-crons && /usr/sbin/run-crons )
Feb 13 09:18:33 opteron su[10678]: Successful su for root by david
Feb 13 09:18:33 opteron su[10678]: + pts/6 david:root
Feb 13 09:18:33 opteron su[10678]: pam_unix(su:session): session opened 
for user root by david(uid=1000)
<access_log>
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/favicon.ico HTTP/1.1" 200 894
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/lib/speller/spellChecker.js HTTP/1.1" 200 15980
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET / HTTP/1.1" 200 13718
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/styles.php HTTP/1.1" 200 30709

I can create the label like this;
def label()
     print "<%s\n>" % lfile

But I have no idea how to get it to work when a thread is updated.
thanks
-david

-- 
Powered by Gentoo GNU/LINUX
http://www.linuxcrazy.com
pgp.mit.edu



From http  Fri Feb 13 12:25:10 2009
From: http (Paul Rubin)
Date: 13 Feb 2009 09:25:10 -0800
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <7xr622z1u1.fsf@ruckus.brouhaha.com>

News123 <news123 at free.fr> writes:
> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.

BeautifulSoup may be of some help.


From news123 at free.fr  Fri Feb 13 12:41:00 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 18:41:00 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49958d11$0$12422$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <4995b0ad$0$2695$426a74cc@news.free.fr>

Hi Marco / Paul,

Thanks


I'll look into
mechanize,ClientForm and BeautifulSoup.

All three are now installed. I'll just have to play with them.


bye


N

News123 wrote:
> Hi Joel,
> 
> Thanks,
> This (the urllib2 methods you combined with cookielib) is what I am
> currently trying to do.
> 
> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.
> 
> 
> bye
> 
> N
> 
> 
> 
> Joe Riopel wrote:
>> On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
>>> Hi,
>>> I'd like to do some web automation with python 2.5
>>> - https:
>>> - a cookiejar
>>> - some forms to be filled in
>>> what is the best set of modules.
>> I have automated some testing of our product, using it's web UI with
>> Python with urllib2 and urrlib. I don't actually fill in the forms, I
>> just recreate the post and set the values of the post variables (so I
>> don't get any form validation).
>>
>> Check out:
>> urllib2.build_opener
>> urllib2.HTTPCookieProcessor
>> urllib2.Request


From tripplowe at gmail.com  Fri Feb 13 12:59:22 2009
From: tripplowe at gmail.com (tripp)
Date: Fri, 13 Feb 2009 09:59:22 -0800 (PST)
Subject: Fortran array in python (f2py?)...
Message-ID: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>

Hello Folks,

I have a fortran program I use to process several satellite images.  I
currently output the results to a text file (~750 mb) which is then
read by a perl program that outputs a GIS-ready image using GDAL
(www.gdal.org).   There are python libraries for GDAL too.

I'd like to pipe the array directly to python from fortran (instead of
writing it out to a text file).  Is it possible to access an in-memory
fortran array with python?

I've looked at f2py, but I could not tell if this was possible.

Thanks.
-TLowe





From matiassurdi at gmail.com  Fri Feb 13 13:01:04 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Fri, 13 Feb 2009 19:01:04 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49957df1$0$15145$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <gn4ch0$euq$1@ger.gmane.org>

You should give a look to Selenium. It's great.

http://www.openqa.org



News123 wrote:
> Hi,
> 
> 
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
> 
> 
> what is the best set of modules.
> 
> As far as I understood, there is httplib, but it seems (if I understood
> well) to be incoompatible with cookielib
> 
> I'm a newcomer to webautomation with python and would be thankful for
> good suggestions.
> 
> 
> I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> forgot the name) to handle parsing and filling in Forms.
> 
> thanks in advance for any pointers opinions
> 
> 
> N
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From tjreedy at udel.edu  Fri Feb 13 13:05:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:05:10 -0500
Subject: something wrong with isinstance
In-Reply-To: <op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>	<mailman.9481.1234520852.3487.python-list@python.org>	<gn3irc$mss$02$1@news.t-online.com>
	<op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <gn4col$fug$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Fri, 13 Feb 2009 08:43:03 -0200, Peter Otten <__peter__ at web.de> 
> escribi?:

>>>>> class Type(type):
>> ...     def __instancecheck__(self, other): return True
>> ...
>>>>> class A(metaclass=Type): pass
>> ...
>>>>> class B: pass
>> ...
>>>>> isinstance(B(), A)
>> True
>>
>> See also
>>
>> http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass 
>>
> 
> Ah, ok. Isn't menctioned in the main documentation though.

Lack reported in http://bugs.python.org/issue5250



From mccredie at gmail.com  Fri Feb 13 13:16:40 2009
From: mccredie at gmail.com (Matimus)
Date: Fri, 13 Feb 2009 10:16:40 -0800 (PST)
Subject: Python knapsack problem
References: <gn45qd$t67$1@ss408.t-com.hr>
Message-ID: <1d7e1bcd-58f6-4788-9e42-9f6ed04369c1@b38g2000prf.googlegroups.com>

On Feb 13, 8:06?am, "Kurioz" <zpetel... at gmaljo.com> wrote:
> Hi,
>
> I got the assignment to solve the knapsack problem in Python. I have to find
> the solution to put items in a sack (I have only one item A, B and C) which
> maxWeight can't be larger than 6 kilograms. ?Solution of this problem should
> be A and C but the only solution I'm getting is B and C which aren't true
> because weight of the B and C is 7 kilograms which is heavier than the
> maxWeight.
>
> If anyone could point me what am I doing wrong I'd be very grateful! Thanks
> in advance!
>
> Code:
>
> #1st array element is weight of an item, and 2nd array element is value
> A=[2.0,1.0]
> B=[3.0,7.0]
> C=[4.0,8.0]
> #Checking the values per one kilo
> vA=A[1]/A[0]
> vB=B[1]/B[0]
> vC=C[1]/C[0]
> maxWeight=0
> print vA,vB,vC
> #Checking the values
> while maxWeight<6:
> ? ? if int(vA)>int(vB) and int(vA)>int(vC):
> ? ? ? ? maxWeight=maxWeight+A[0]
> ? ? ? ? vA=0
> ? ? ? ? print maxWeight
>
> ? ? elif int(vB)>int(vA) and int(vB)>int(vC):
> ? ? ? ? maxWeight=maxWeight+B[0]
> ? ? ? ? print maxWeight
>
> ? ? else:
> ? ? ? ? vC=0
> ? ? ? ? maxWeight=maxWeight+C[0]
> ? ? ? ? print maxWeight


You will need to check whether each item can fit before adding it.

Currently you are doing:

while there is room in the sac:
    add the next most valuable item

You should be doing:

while there is room in the sac:
    if the next most valuable item fits
       add it

But... once you fix that you will run into another issue.

You are using ints to compare. Casting floating point values to ints
will always
round down.

vA = 0.5
vB = 2.3333...
vC = 2.0

But..

>>> int(vA)
0
>>> int(vB)
2
>>> int(vC)
2

Matt



From tjreedy at udel.edu  Fri Feb 13 13:22:45 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:22:45 -0500
Subject: Levenshtein word comparison -performance issue
In-Reply-To: <op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <gn4dpl$jpf$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva 
> <s.selvamsiva at gmail.com> escribi?:
> 
>> I need some help.
>> I tried to find top n(eg. 5) similar words for a given word, from a
>> dictionary of 50,000 words.
>> I used python-levenshtein module,and sample code is as follow.
>>
>> def foo(searchword):
>>     disdict={}
>>     for word in self.dictionary-words:
>>                    distance=Levenshtein.ratio(searchword,word)
>>                    disdict[word]=distance
>>     """
>>      sort the disdict dictionary by values in descending order
>>     """
>>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>>
>>     return similarwords[:5]
> 
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - 
> at least you won't waste time sorting 49995 irrelevant words...

There is also no need to build the 50000 entry word-distance dictionary.

import heapq, functools

def foo(searchword, n):
   distance = functools.partial(Levenshtein.ratio, searchword)
   return heapq.nlargest(n, words, distance)

If the distances are wanted along with the similar words, I strongly 
suspect that it would be faster to recalculate a small number than to 
generate the dict of 50000 pairs.

> Anyway you should measure the time taken by the first part 
> (Levenshtein), it may be the most demanding. I think there is a C 
> extension for this, should be much faster than pure Python calculations.

And such could be dropped into the code above.

Terry Jan Reedy




From google at mrabarnett.plus.com  Fri Feb 13 13:27:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 18:27:00 +0000
Subject: Fortran array in python (f2py?)...
In-Reply-To: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
Message-ID: <4995BB74.7000200@mrabarnett.plus.com>

tripp wrote:
> Hello Folks,
> 
> I have a fortran program I use to process several satellite images.  I
> currently output the results to a text file (~750 mb) which is then
> read by a perl program that outputs a GIS-ready image using GDAL
> (www.gdal.org).   There are python libraries for GDAL too.
> 
> I'd like to pipe the array directly to python from fortran (instead of
> writing it out to a text file).  Is it possible to access an in-memory
> fortran array with python?
> 
> I've looked at f2py, but I could not tell if this was possible.
> 
How about outputting the results to the Python program via a pipe?


From tjreedy at udel.edu  Fri Feb 13 13:34:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:34:03 -0500
Subject: Python knapsack problem
In-Reply-To: <gn45qd$t67$1@ss408.t-com.hr>
References: <gn45qd$t67$1@ss408.t-com.hr>
Message-ID: <gn4eep$m7h$1@ger.gmane.org>

Kurioz wrote:

> I got the assignment to solve the knapsack problem in Python. I have to 
> find the solution to put items in a sack (I have only one item A, B and 
> C) which maxWeight can't be larger than 6 kilograms.  Solution of this 
> problem should be A and C but the only solution I'm getting is B and C 
> which aren't true because weight of the B and C is 7 kilograms which is 
> heavier than the maxWeight.
> 
> If anyone could point me what am I doing wrong I'd be very grateful! 
> Thanks in advance!

There are several comments I could make, but your immediate problem is 
this: before putting something in the knapsack, you must check whether 
it will exceed the limit.  Since this is a class assignment, I will stop 
there.

> 
> Code:
> 
> #1st array element is weight of an item, and 2nd array element is value
> A=[2.0,1.0]
> B=[3.0,7.0]
> C=[4.0,8.0]
> #Checking the values per one kilo
> vA=A[1]/A[0]
> vB=B[1]/B[0]
> vC=C[1]/C[0]
> maxWeight=0
> print vA,vB,vC
> #Checking the values
> while maxWeight<6:
>    if int(vA)>int(vB) and int(vA)>int(vC):
>        maxWeight=maxWeight+A[0]
>        vA=0
>        print maxWeight
> 
>    elif int(vB)>int(vA) and int(vB)>int(vC):
>        maxWeight=maxWeight+B[0]
>        print maxWeight
> 
>    else:
>        vC=0
>        maxWeight=maxWeight+C[0]
>        print maxWeight
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 



From lists at cheimes.de  Fri Feb 13 13:50:06 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 13 Feb 2009 19:50:06 +0100
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <4995A7EE.2000302@abbottdavid.com>
References: <4995A7EE.2000302@abbottdavid.com>
Message-ID: <gn4fd0$paa$1@ger.gmane.org>

David schrieb:
> Hi everyone,
> 
> I copied a program from C to track multiple log files. I would like to
> be able to print a label when a log file is updated. Here is the program;

Don't use threads for the job. On Unix the preferred way is select()'ing
or poll()'ing multiple file descriptors.

Christian



From goon12 at gmail.com  Fri Feb 13 13:59:58 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Fri, 13 Feb 2009 13:59:58 -0500
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <4995A7EE.2000302@abbottdavid.com>
References: <4995A7EE.2000302@abbottdavid.com>
Message-ID: <6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>

On Fri, Feb 13, 2009 at 12:03 PM, David <david at abbottdavid.com> wrote:
> Hi everyone,
>
> I copied a program from C to track multiple log files. I would like to be
> able to print a label when a log file is updated. Here is the program;

Since you're calling tail itself, why not just use tail's ability to
tail multiple files? It too will output the label.

I am using tail from the GNU coreutils, version 5.97.

I did the following, using two xterms:

First, in one xterm window:
$ touch foo bar
$ tail -f foo bar

Then in another xterm:
$ echo "Hi foo" > foo
$ echo "Hi bar" > bar

Back in the first xterm window I see this:
$ tail -f foo bar
==> foo <==

==> bar <==

==> foo <==
Hi foo

==> bar <==
Hi bar


From david at abbottdavid.com  Fri Feb 13 14:18:11 2009
From: david at abbottdavid.com (David)
Date: Fri, 13 Feb 2009 14:18:11 -0500
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>
References: <4995A7EE.2000302@abbottdavid.com>
	<6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>
Message-ID: <4995C773.9000000@abbottdavid.com>

Joe Riopel wrote:
> On Fri, Feb 13, 2009 at 12:03 PM, David <david at abbottdavid.com> wrote:
>> Hi everyone,
>>
>> I copied a program from C to track multiple log files. I would like to be
>> able to print a label when a log file is updated. Here is the program;
> 
> Since you're calling tail itself, why not just use tail's ability to
> tail multiple files? It too will output the label.
> 
> I am using tail from the GNU coreutils, version 5.97.
> 
> I did the following, using two xterms:
> 
> First, in one xterm window:
> $ touch foo bar
> $ tail -f foo bar
> 
> Then in another xterm:
> $ echo "Hi foo" > foo
> $ echo "Hi bar" > bar
> 
> Back in the first xterm window I see this:
> $ tail -f foo bar
> ==> foo <==
> 
> ==> bar <==
> 
> ==> foo <==
> Hi foo
> 
> ==> bar <==
> Hi bar
> 
> 
Thanks Joe, sure am glad I asked. Oh well it was good practice as I am 
just learning python, I don't know how I missed that I could tail more 
than one file.

-- 
Powered by Gentoo GNU/LINUX
http://www.linuxcrazy.com
pgp.mit.edu



From mmaddox at umd.edu  Fri Feb 13 14:28:09 2009
From: mmaddox at umd.edu (mike)
Date: Fri, 13 Feb 2009 11:28:09 -0800 (PST)
Subject: problems opening files
Message-ID: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>

I have aprogram that manipulates several text files, does some math
and saves new files then exits.

The program worked fine on the original set of data, but with new data
does not open the files as needed.  When I copy and paste the 'open
line' from the module to IDLE the file opens.

section of code that is not working and import statements below:

import statements------------

# combine point source data

from numpy import *
from string import *
import point_input

section of code-----------------

pathincbp=path+'/sub'+sub+'/cbp_'+npdes+'.txt'
    flag='false'
    while flag=='false':
        try:
            cbpin=open(pathincbp,'r')
            flag='true'

stopping the module manually------------------------------

Traceback (most recent call last):
  File "C:\Python25\point_sources\combine_point_sources_swat.py", line
155, in <module>
    print pathincbp+' not found'
KeyboardInterrupt

IDLE commands---------------------------

>>> cbpin=open(pathincbp,'r')
>>> cbpin
<open file 'c:/potomac_points_data/sub1/cbp_PA0026051.txt', mode 'r'
at 0x01450380>

I am running in windows xp professional 2002 service pack 3 on a Xeon
dell

Thanks,
Mike




From tripplowe at gmail.com  Fri Feb 13 14:35:07 2009
From: tripplowe at gmail.com (tripp)
Date: Fri, 13 Feb 2009 11:35:07 -0800 (PST)
Subject: Fortran array in python (f2py?)...
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9506.1234549622.3487.python-list@python.org>
Message-ID: <b623560c-c409-43dc-8adf-a99b9924f760@v39g2000yqm.googlegroups.com>

On Feb 13, 1:27?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> tripp wrote:
> > Hello Folks,
>
> > I have a fortran program I use to process several satellite images. ?I
> > currently output the results to a text file (~750 mb) which is then
> > read by a perl program that outputs a GIS-ready image using GDAL
> > (www.gdal.org). ? There are python libraries for GDAL too.
>
> > I'd like to pipe the array directly to python from fortran (instead of
> > writing it out to a text file). ?Is it possible to access an in-memory
> > fortran array with python?
>
> > I've looked at f2py, but I could not tell if this was possible.
>
> How about outputting the results to the Python program via a pipe?

The array I'd like to output is 8500 x 7500.  Would that be possible?
I'm NOT RAM limited.


From google at mrabarnett.plus.com  Fri Feb 13 14:40:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 19:40:51 +0000
Subject: problems opening files
In-Reply-To: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>
References: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>
Message-ID: <4995CCC3.7020403@mrabarnett.plus.com>

mike wrote:
> I have aprogram that manipulates several text files, does some math
> and saves new files then exits.
> 
> The program worked fine on the original set of data, but with new data
> does not open the files as needed.  When I copy and paste the 'open
> line' from the module to IDLE the file opens.
> 
> section of code that is not working and import statements below:
> 
> import statements------------
> 
> # combine point source data
> 
> from numpy import *
> from string import *
> import point_input
> 
> section of code-----------------
> 
> pathincbp=path+'/sub'+sub+'/cbp_'+npdes+'.txt'
>     flag='false'
>     while flag=='false':
>         try:
>             cbpin=open(pathincbp,'r')
>             flag='true'
> 
> stopping the module manually------------------------------
> 
> Traceback (most recent call last):
>   File "C:\Python25\point_sources\combine_point_sources_swat.py", line
> 155, in <module>
>     print pathincbp+' not found'
> KeyboardInterrupt
> 
> IDLE commands---------------------------
> 
>>>> cbpin=open(pathincbp,'r')
>>>> cbpin
> <open file 'c:/potomac_points_data/sub1/cbp_PA0026051.txt', mode 'r'
> at 0x01450380>
> 
> I am running in windows xp professional 2002 service pack 3 on a Xeon
> dell
> 
What exception is the open() raising? From the partial code you've
provided I can't tell whether the 'try' is catching any exception. The
traceback just tells me that you interrupted the script, not what "is
not working" actually means.


From Scott.Daniels at Acm.Org  Fri Feb 13 15:09:41 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 13 Feb 2009 12:09:41 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
Message-ID: <-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>

W. eWatson wrote:
> Terry Reedy wrote:
>> W. eWatson wrote:
>>>  From Diez above.
>>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>>> run it
>>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>>> pyhton-file your app is in. That's all that there is to it.
>>>
>>> So this is the absolute truth? No wiggle room? One can never use a 
>>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>>> doesn't issue a standard warning that says, "Get out of here with 
>>> your Tkinter program, it will fail when you try to run it here. You 
>>> have entered Tkinter hell. Good-bye."
>>
>> Re-read my post about kids fighting to control a television.  Maybe 
>> they work together, maybe they crash the TV.  Hard to predict.
>>
>> ***ANY*** Python program that tries to grab and control the same 
>> resources that TK does may conflict with it.  There is no way that 
>> IDLE can have a list of, for instance, all event-grabbing mainloop 
>> programs.
>>
> OK, enough tinkering with the code and others matters on my end trying 
> to find a work around. Somehow after much successful use of IDLE's 
> execution facility, I've stepped on an invisible banana peel. I think 
> it's evident that I'm not going around this problem easily with the IDLE 
> execution attempts, and that another solution is required.
That's correct, but you still don't understand _why_ it is correct.
I suggest you re-read the thread and try to understand everything you
are being told.

> First, I think somewhere up the thread someone suggested that Active 
> pythonWin is not dependent upon Tk, correct? Therefore, it is immune 
> from such problems, correct?

Wrong.  I was the one who said that ActiveState had a product to debug
Python programs across a nertwork connection.  The product is _not_
ActivePython (the freely distributed system), but rather the Komodo IDE,
which does cost money.

> Finally, we can probably agree that I can continue to use IDLE for 
> editing and syntax checking, but to "guarantee" successful execution of 
> the program, I can just double-click on the py file in my folder. 
> Perhaps there is a better way than clicking on it in the folder. For 
> example, putting it on the desktop. As I look at the folder, previous 
> copies only differ by a digit, I can easily find myself executing an 
> earlier version, differing as Dev4, to Dev5 at the end of each name.

OK, you are using the oldest and least useful revision control system,
"rename and remember."  I'd suggest you get and use bazaar, but you'll
just ask for shortcuts on how to use it without understanding what it does.

--Scott David Daniels
Scott.Daniels at Acm.Org


From bryanvick at gmail.com  Fri Feb 13 15:42:41 2009
From: bryanvick at gmail.com (Bryan)
Date: Fri, 13 Feb 2009 12:42:41 -0800 (PST)
Subject: Upgrading standard library module
Message-ID: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>

I have a Python v2.5.2 server running and I found some undesirable
behavior in the xmlrpclib module that is included with that version of
Python.  The xmlrpclib version that is included with Python 2.6
changes the behavior for the better.  I nervous about upgrading my
Python install to 2.6 on this server because I remember reading in the
docs of a library I use that it targets the 2.5 branch.  What is the
best way to only upgrade the xmlrpclib in my 2.5 install?

Also, have you all had problems with libraries not specifying which
Python version they target?  I can't find a requirements for the
formencode library.  It is kind of scary upgrading my Python server
install without being sure all my libraries will work.  Experiences??

Bryan


From castironpi at gmail.com  Fri Feb 13 15:45:49 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 13 Feb 2009 12:45:49 -0800 (PST)
Subject: pdb in 3.0 very buggy (Win XP Home)
Message-ID: <8a640af7-41e9-4de6-8b18-fa18c3448b64@v5g2000pre.googlegroups.com>

Hi, got a freeze when running 'pdb' in 3.0.

The program executes correctly with the command 'c', but freezes part
way through when running successive 'n' commands.  Platform Windows XP
Home.  Python 3.0 (r30:67507, Dec  3 2008, 20:14:27) [MSC v.1500 32
bit (Intel)] on win32.  The 'list' command was also not working
properly, printing '[EOF]' many places, even when prompted with
arguments for 'first' and 'last'.

/Screen dump:

C:\Documents and Settings\usr\Desktop\working>\programs
\python30\python -m pdb picktest.py

--Return--
> <string>(5)A()->None
(Pdb) c
0
1
2
The program finished and will be restarted
--Return--
> <string>(5)A()->None
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1467)closed()->False
-> return self.buffer.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\encodings\cp437.py(19)encode()->b'0'
-> return codecs.charmap_encode(input,self.errors,encoding_map)[0]
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
0--Return--
> c:\programs\python30\lib\io.py(1060)write()->1
-> return written
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1498)write()->1
-> return length
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1467)closed()->False
-> return self.buffer.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\encodings\cp437.py(19)encode()->b'\n'
-> return codecs.charmap_encode(input,self.errors,encoding_map)[0]
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n

--Return--
> c:\programs\python30\lib\io.py(1060)write()->1
-> return written
(Pdb) n

/Program:

class A:
    def f( self ):
        self.x= 0
        print( self.x )
    def g( self ):
        self.x+= 1
        print( self.x )

a= A()
a.f()
a.g()
a.g()



From kyosohma at gmail.com  Fri Feb 13 15:46:37 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 13 Feb 2009 12:46:37 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
Message-ID: <9943880a-2d4f-4532-96f5-83ebe4b32e6b@c12g2000yqj.googlegroups.com>

On Feb 13, 2:42?pm, Bryan <bryanv... at gmail.com> wrote:
> I have a Python v2.5.2 server running and I found some undesirable
> behavior in the xmlrpclib module that is included with that version of
> Python. ?The xmlrpclib version that is included with Python 2.6
> changes the behavior for the better. ?I nervous about upgrading my
> Python install to 2.6 on this server because I remember reading in the
> docs of a library I use that it targets the 2.5 branch. ?What is the
> best way to only upgrade the xmlrpclib in my 2.5 install?
>
> Also, have you all had problems with libraries not specifying which
> Python version they target? ?I can't find a requirements for the
> formencode library. ?It is kind of scary upgrading my Python server
> install without being sure all my libraries will work. ?Experiences??
>
> Bryan

Well, you could put your current install in a virtualenv and then try
the new version of Python 2.6 in another virtualenv. See
http://pypi.python.org/pypi/virtualenv for more info.

As long as your 3rd party packages are pure python, you should be ok.
If they depend on c/c++ headers, then you may have issues.

Mike


From robert.kern at gmail.com  Fri Feb 13 16:41:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 13 Feb 2009 15:41:04 -0600
Subject: Fortran array in python (f2py?)...
In-Reply-To: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
Message-ID: <gn4pdh$s7a$1@ger.gmane.org>

On 2009-02-13 11:59, tripp wrote:
> Hello Folks,
>
> I have a fortran program I use to process several satellite images.  I
> currently output the results to a text file (~750 mb) which is then
> read by a perl program that outputs a GIS-ready image using GDAL
> (www.gdal.org).   There are python libraries for GDAL too.
>
> I'd like to pipe the array directly to python from fortran (instead of
> writing it out to a text file).  Is it possible to access an in-memory
> fortran array with python?
>
> I've looked at f2py, but I could not tell if this was possible.

f2py makes Python extension modules that wrap FORTRAN code. Basically, what you 
would have to do is use f2py to wrap the subroutines of your FORTRAN program; 
your Python program will be the main driver. It is usually recommended that your 
Python program allocate the memory in the form of a numpy array, and pass it 
into your FORTRAN subroutines to be filled. F77 fixed arrays are well-supported; 
F90 allocatable arrays and pointers are not. You may need a fixed array shim 
layer around your Fortran 90 code if it uses these features.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jason.scheirer at gmail.com  Fri Feb 13 16:52:07 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Fri, 13 Feb 2009 13:52:07 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
Message-ID: <c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>

On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
> I have a Python v2.5.2 server running and I found some undesirable
> behavior in the xmlrpclib module that is included with that version of
> Python. ?The xmlrpclib version that is included with Python 2.6
> changes the behavior for the better. ?I nervous about upgrading my
> Python install to 2.6 on this server because I remember reading in the
> docs of a library I use that it targets the 2.5 branch. ?What is the
> best way to only upgrade the xmlrpclib in my 2.5 install?
>
> Also, have you all had problems with libraries not specifying which
> Python version they target? ?I can't find a requirements for the
> formencode library. ?It is kind of scary upgrading my Python server
> install without being sure all my libraries will work. ?Experiences??
>
> Bryan

Python has always been pretty backwards-compatible and has a nice
roadmap for upgrades (with new languages features living in __future__
for a version or so before they're in the main version). With the
exception of 2.X->3, you can usually assume that any pure-Python
modules written for 2.x will work in 2.(x+1), and assuming they don't
issue any warnings, also in 2.(x+2).

What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
and 2.6, only significant differences I see are checks for True/False
as builtins left over from pre-2.4 and some datetime handling.


From bryanvick at gmail.com  Fri Feb 13 17:17:35 2009
From: bryanvick at gmail.com (Bryan)
Date: Fri, 13 Feb 2009 14:17:35 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
Message-ID: <a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>

On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>
> > I have a Python v2.5.2 server running and I found some undesirable
> > behavior in the xmlrpclib module that is included with that version of
> > Python. ?The xmlrpclib version that is included with Python 2.6
> > changes the behavior for the better. ?I nervous about upgrading my
> > Python install to 2.6 on this server because I remember reading in the
> > docs of a library I use that it targets the 2.5 branch. ?What is the
> > best way to only upgrade the xmlrpclib in my 2.5 install?
>
> > Also, have you all had problems with libraries not specifying which
> > Python version they target? ?I can't find a requirements for the
> > formencode library. ?It is kind of scary upgrading my Python server
> > install without being sure all my libraries will work. ?Experiences??
>
> > Bryan
>
> Python has always been pretty backwards-compatible and has a nice
> roadmap for upgrades (with new languages features living in __future__
> for a version or so before they're in the main version). With the
> exception of 2.X->3, you can usually assume that any pure-Python
> modules written for 2.x will work in 2.(x+1), and assuming they don't
> issue any warnings, also in 2.(x+2).
>
> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
> and 2.6, only significant differences I see are checks for True/False
> as builtins left over from pre-2.4 and some datetime handling.

The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
custom objects.  It checks the type of my object, and if it isn't in a
hard-coded list of types, then a "Cannot marshal object of <type>
type" exception message shows up.  The version in my Windows 2.6
install has a fall back case where if the type is not in the hard-
coded list, it simply calls Object.__dict__ to get a graph of the
object's values that can be marshaled into xmlrpc.

I am using xmlrpc through Pylons.  As a workaround, instead of
returning my custom objects in my xmlrpc server functions, I return
MyObject.__dict__

I also did not see anything in the revision log in the source file
about this change.


From torppa at staff.megabaud.fi  Fri Feb 13 17:50:57 2009
From: torppa at staff.megabaud.fi (Jarkko Torppa)
Date: Fri, 13 Feb 2009 22:50:57 GMT
Subject: *nix tail -f multiple log files with Thread
References: <4995A7EE.2000302@abbottdavid.com>
	<mailman.9508.1234551024.3487.python-list@python.org>
Message-ID: <slrngpbuah.s1i.torppa@polykoira.megabaud.fi>

On 2009-02-13, Christian Heimes <lists at cheimes.de> wrote:
> David schrieb:
>> Hi everyone,
>> 
>> I copied a program from C to track multiple log files. I would like to
>> be able to print a label when a log file is updated. Here is the program;
>
> Don't use threads for the job. On Unix the preferred way is select()'ing
> or poll()'ing multiple file descriptors.

     File descriptors associated with regular files always select
     true  for  ready  to  read, ready to write, and error condi-
     tions.

     Regular files always poll TRUE for reading and writing.

You have to either sleep or use kevent/completion/...

-- 
Jarkko Torppa, Elisa


From rhodri at wildebst.demon.co.uk  Fri Feb 13 17:57:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 22:57:42 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
Message-ID: <op.upbbegcga8ncjz@gnudebst>

On Fri, 13 Feb 2009 11:13:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> OK, enough tinkering with the code and others matters on my end trying  
> to find a work around. Somehow after much successful use of IDLE's  
> execution facility, I've stepped on an invisible banana peel. I think  
> it's evident that I'm not going around this problem easily with the IDLE  
> execution attempts, and that another solution is required.

Congratulations, we've only been telling you this for the last few days.
I wonder, is there any chance that you've noticed the solution given?

> First, I think somewhere up the thread someone suggested that Active  
> pythonWin is not dependent upon Tk, correct?

Someone certainly suggested that something is based on Microsoft
Foundation Classes, which isn't very likely to be Tk-based :-)
Whatever that something is, I'm pretty sure it isn't called "Active
pythonWin".

> Therefore, it is immune from such problems, correct?

No.

Let me put it like this.  Your Tkinter program is listening out for
events like windows being moved, the mouse being clicked, keys being
pressed and so on.  IDLE also listens out for a selection of events
of the same sort.  A different graphical IDE will do the same, but will
trap and interpret the events in an entirely different manner that is
probably not even a little bit compatible with your program.  When
you run your program from inside *any* IDE, not just IDLE, it's a bit
of a lottery as to whether your program gets an event, or the IDE
does.  Chances are, *both* need to see it, at which point you're
stuck.

It is possible to do this successfully, but only in a very limited
way and only if you're very careful.  If you think either of those
conditions hold, you are wrong.


> Second, maybe I missed it above, but when I posted the output from the  
> program that showed the failure, was there anything that said, "IDLE  
> problem" or would even give a clue that's the culprit?

How can it?  It's not IDLE's problem, it's yours.

> Finally, we can probably agree that I can continue to use IDLE for  
> editing and syntax checking, but to "guarantee" successful execution of  
> the program, I can just double-click on the py file in my folder.  
> Perhaps there is a better way than clicking on it in the folder.

Typing at a command prompt.

> For example, putting it on the desktop.

This causes an extra file read as Windows indirects through the desktop
link.  It's unlikely to be a noticeable delay at startup, but I'd
hesitate to call it "better".

> As I look at the folder, previous copies only differ by a digit, I can  
> easily find myself executing an earlier version, differing as Dev4, to  
> Dev5 at the end of each name.

I'd suggest spending a while reading up on version control systems.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From simon.hibbs at gmail.com  Fri Feb 13 18:16:56 2009
From: simon.hibbs at gmail.com (Simon Hibbs)
Date: Fri, 13 Feb 2009 15:16:56 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9446.1234477452.3487.python-list@python.org>
	<24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
Message-ID: <165a0269-e7bb-49f0-a1cb-5507901604d7@h5g2000yqh.googlegroups.com>

On 13 Feb, 02:53, azrael <jura.gro... at gmail.com> wrote:

> All I hear when I talk to people who own or eork in SW companies is
> "Python? Isn't that that small scripting language. This will never
> bring a real application." I am tired of hearing this. Even Microsoft
> implemented Python. Only because the GUI building I am thinking about
> of moving to IronPython. But this great comunity holds me bac on
> CPython.

I don't agree at all that Python can't compete with Visual Studio for
GUI development. There are Python modules for Eclipse if you need an
enterprise class IDE. For GUI design the PyQT GUI toolkit includes QT
Designer - a fully featured graphical GUI builder every bit as capable
as the one in Visual Studio. In fact I much prefer working in QT
Designer for GUI layout, the Signals/Slots model for hooking up to the
application  logic is just so much more elegant and robust.

If Eclipse is a bit heavyweight for you, and you're after a Pyhton
equivalent to VB, I can't recommend Eric enough. It's a Python IDE
written in Python using the PyQT toolkit, and integrates directly with
QTDesigner. IMHO it's far superior to anything Microsoft has to offer,
with full native support for MacOS X, Linux and Windows.

The only fly in the ointment in licensing. The QT toolkit will be
fully GPL and LGPL from version 4.4, but PyQT itself has a dual GPL/
commercial licensing structure. Still, it's relatively cheap and well
worth it if you're goingt to do commercial development.

Simon Hibbs


From me at gustavonarea.net  Fri Feb 13 18:56:34 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Fri, 13 Feb 2009 15:56:34 -0800 (PST)
Subject: Turning a signature-changing decorator into a signature-preserving 
	one
Message-ID: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>

Hello, everybody.

I have this signature-changing decorator
<http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
which I
want to turn into a signature-preserving one. Here's my try
<http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
but I get
this error:
http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wrap=no

What am I doing wrong? I think it looks like this example:
http://pypi.python.org/pypi/decorator#async

Thanks in advance.

  - Gustavo.

PS: functols.wrap is not an option because my code has to work with
Python 2.4+.


From basilisk96 at gmail.com  Fri Feb 13 19:22:41 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:22:41 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>

On Feb 12, 10:39?pm, Damon <damonwisc... at gmail.com> wrote:
> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.

A very good idea indeed. I would love to start using Py3k today, but I
am still on 2.5 because I depend on win32 binaries for the majority of
my library packages. I can build some myself, but not all. A
repository of prebuilt binaries that stay in step with currently
available language releases would be most welcome.

Just my $0.02,
-Basilisk96


From gloxy at yahoo.com  Fri Feb 13 19:35:28 2009
From: gloxy at yahoo.com (Sue)
Date: Sat, 14 Feb 2009 00:35:28 -0000
Subject: Which to install on my windows vista laptop?
Message-ID: <gn53kg+3atn@eGroups.com>

Hi,

Which python 2.6.1 file should I download for my windows vista home
premium laptop?  (32bit, AMD turion 64 x2)

the windows x86 MSI installer or the windows AMD64 MSI installer? 

Thank you!

Sue



From basilisk96 at gmail.com  Fri Feb 13 19:44:38 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:44:38 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
	<pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>
Message-ID: <48b49eef-b3c1-4a9d-bf38-ad24c2b89622@t11g2000yqg.googlegroups.com>

On Feb 12, 1:15?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > I usually strive
> > for comprehensions if a for loop can be reduced to such.
>
> Any particular reason?

Only two.
1.) I was impressed by their clarity and conciseness when I first
discovered them.
2.) I also read now and then that simple list comprehensions are
faster when compared with their for-loop equivalents because of the
way comprehensions are implemented under the hood. My example is a far
cry from a "simple" comprehension, however. :)


> If there's only one call to func(), and you ignore the (probably) fixed
> cost of jumping into a generator each time, then it shouldn't make any
> difference.
>
> If you are comparing one call to func() in a for loop versus three calls
> to func() in a list comp or generator expression, then of course the for
> loop will be more efficient.

I agree. I would rather call func() only once per iteration in any
case. I will revise it to a plain for loop with a single call.

Thanks,
-Basilisk96


From zpeteljac at gmaljo.com  Fri Feb 13 19:45:53 2009
From: zpeteljac at gmaljo.com (Kurioz)
Date: Sat, 14 Feb 2009 01:45:53 +0100
Subject: Which to install on my windows vista laptop?
In-Reply-To: <mailman.9515.1234572128.3487.python-list@python.org>
References: <mailman.9515.1234572128.3487.python-list@python.org>
Message-ID: <gn547e$rh$1@ss408.t-com.hr>

If you are using 32bit OS(which you are) then use the x86 MSI installer. 
AMD64 MSI installer is used only when you are using 64bit OS.
"Sue" <gloxy at yahoo.com> wrote in message 
news:mailman.9515.1234572128.3487.python-list at python.org...
Hi,

Which python 2.6.1 file should I download for my windows vista home
premium laptop?  (32bit, AMD turion 64 x2)

the windows x86 MSI installer or the windows AMD64 MSI installer?

Thank you!

Sue




From basilisk96 at gmail.com  Fri Feb 13 19:54:32 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:54:32 -0800 (PST)
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com> 
	<mailman.9482.1234521740.3487.python-list@python.org>
Message-ID: <78b2288c-6a67-4bc0-bd75-aebd85cc2a1a@i38g2000yqd.googlegroups.com>

On Feb 13, 5:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - at ?
> least you won't waste time sorting 49995 irrelevant words...
> Anyway you should measure the time taken by the first part (Levenshtein), ?
> it may be the most demanding. I think there is a C extension for this, ?
> should be much faster than pure Python calculations.

subdist: http://pypi.python.org/pypi/subdist/0.2.1
It uses a modified "fuzzy" version of the Levenshtein algorithm, which
I found more useful than the strict version. The only quirk to it is
that it accepts nothing but unicode. Other than that, it's a keeper.
It is extremely fast.

Cheers,
-Basilisk96


From benjamin.kaplan at case.edu  Fri Feb 13 20:01:32 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 20:01:32 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
	<69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>
Message-ID: <ec96e1390902131701h67f26568na5cff71f8db0784@mail.gmail.com>

On Fri, Feb 13, 2009 at 7:22 PM, Basilisk96 <basilisk96 at gmail.com> wrote:

> On Feb 12, 10:39 pm, Damon <damonwisc... at gmail.com> wrote:
> > * Like R, every time there is a new version of Python, the repository
> > should rebuild the packages, for all supported platforms, and make
> > available all those that compile cleanly. R also forces you to write
> > properly structured documentation for every exposed function, before
> > the repository will accept it.
>
> A very good idea indeed. I would love to start using Py3k today, but I
> am still on 2.5 because I depend on win32 binaries for the majority of
> my library packages. I can build some myself, but not all. A
> repository of prebuilt binaries that stay in step with currently
> available language releases would be most welcome.
>
> Just my $0.02,
> -Basilisk96


With Py3K, it's a little bit more complicated than rebuilding all the
packages. Because it broke compatibility, all of the C extensions have to be
rewritten before they'll work. That's why it's taking longer to create
Python 3 packages than to create 2.6 versions.

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From argo785 at gmail.com  Fri Feb 13 20:35:04 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Fri, 13 Feb 2009 17:35:04 -0800 (PST)
Subject: Easier to wrap C or C++ libraries?
Message-ID: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>

When creating a Python binding to a C or C++ library, which is easier
to wrap, the C lib or the C++ one? Given a choice, if you had to
choose between using one of two libs, one written in C, the other in C+
+ -- both having approximately the same functionality -- which would
you rather deal with from your Python code?

It would seem to me that there's fewer design considerations when
wrapping a library written in C; you just wrap the functions. However,
since Python supports OOP nicely, it might also be that wrapping C++
code *could* also be staightforward... Are there many pitfalls when
having to map C++'s notion of OO to Python?


From zooko at zooko.com  Fri Feb 13 20:55:55 2009
From: zooko at zooko.com (zooko)
Date: Fri, 13 Feb 2009 18:55:55 -0700
Subject: ANNOUNCING allmydata.org "Tahoe", the Least-Authority Filesystem, v1.3
Message-ID: <4DEC20D9-6E49-451C-9F32-50A377F5FAA4@zooko.com>

Folks:

This "Cloud Storage" system is written entirely in Python except for  
the CPU-intensive parts (cryptography and erasure coding), which are  
provided as Python extension modules.  Thanks for making Python such  
a high-quality and effective tool!

Regards,

Zooko

ANNOUNCING allmydata.org "Tahoe", the Least-Authority Filesystem, v1.3

We are pleased to announce the release of version 1.3.0 of "Tahoe", the
Least Authority Filesystem.

Tahoe-LAFS is a secure, decentralized, fault-tolerant filesystem.  All
of the source code is available under a choice of two Free Software,
Open Source licences.

This filesystem is encrypted and distributed over multiple peers in
such a way it continues to function even when some of the peers are
unavailable, malfunctioning, or malicious.

Here is the one-page explanation of the security and fault-tolerance
properties that it offers:

http://allmydata.org/source/tahoe/trunk/docs/about.html

This is the successor to v1.2, which was released July 21, 2008 [1].
This is a major new release, adding a repairer, an efficient backup
command, support for large files, an (S)FTP server, and much more.

See the NEWS file [2] and the known_issues.txt file [3] for more
information.

In addition to the many new features of Tahoe itself, a crop of related
projects have sprung up, including Tahoe frontends for Windows and
Macintosh, two front-ends written in JavaScript, a Tahoe plugin for
duplicity, a Tahoe plugin for TiddlyWiki, a project to create a new
backup tool, CIFS/SMB integration, an iPhone app, and three incomplete
Tahoe frontends for FUSE. See Related Projects on the wiki: [4].


COMPATIBILITY

The version 1 branch of Tahoe is the basis of the consumer backup
product from Allmydata, Inc. -- http://allmydata.com .

Tahoe v1.3 is fully compatible with the version 1 branch of Tahoe.
Files written by v1.3 clients can be read by clients of all versions
back to v1.0 unless the file is too large -- files greater than about
12 GiB (depending on the configuration) can't be read by older clients.
v1.3 clients can read files produced by clients of all versions since
v1.0.  v1.3 servers can serve clients of all versions back to v1.0 and
v1.3 clients can use servers of all versions back to v1.0 (but can't
upload large files to them).

This is the fourth release in the version 1 series.  We believe that
this version of Tahoe is stable enough to rely on as a permanent store
of valuable data.  The version 1 branch of Tahoe will be actively
supported and maintained for the forseeable future, and future versions
of Tahoe will retain the ability to read files and directories produced
by Tahoe v1 for the forseeable future.


WHAT IS IT GOOD FOR?

With Tahoe, you can distribute your filesystem across a set of
computers, such that if some of the computers fail or turn out to be
malicious, the entire filesystem continues to be available, thanks to
the remaining computers.  You can also share your files with other
users, using a simple and flexible access control scheme.

Because this software is new, we do not categorically recommend it as
the sole repository of data which is extremely confidential or
precious.  However, we believe that erasure coding, strong encryption,
Free/Open Source Software and careful engineering make Tahoe safer than
common alternatives, such as RAID, removable drive, tape, or "on-line
storage" or "Cloud storage" systems.

This software comes with extensive unit tests [5], and there are no
known security flaws which would compromise confidentiality or data
integrity.  (For all currently known issues please see the
known_issues.txt file [2].)

This release of Tahoe is suitable for the "friendnet" use case [6] --
it is easy to create a filesystem spread over the computers of you and
your friends so that you can share disk space and files.


LICENCE

You may use this package under the GNU General Public License, version
2 or, at your option, any later version.  See the file "COPYING.GPL"
[7] for the terms of the GNU General Public License, version 2.

You may use this package under the Transitive Grace Period Public
Licence, version 1.0.  The Transitive Grace Period Public Licence has
requirements similar to the GPL except that it allows you to wait for
up to twelve months after you redistribute a derived work before
releasing the source code of your derived work. See the file
"COPYING.TGPPL.html" [8] for the terms of the Transitive Grace Period
Public Licence, version 1.0.

(You may choose to use this package under the terms of either licence,
at your option.)


INSTALLATION

Tahoe works on Linux, Mac OS X, Windows, Cygwin, and Solaris, and
probably most other systems.  Start with "docs/install.html" [9].


HACKING AND COMMUNITY

Please join us on the mailing list [10].  Patches that extend and
improve Tahoe are gratefully accepted -- the RoadMap page [11] shows
the next improvements that we plan to make and CREDITS [12] lists the
names of people who've contributed to the project.  The wiki Dev page
[13] contains resources for hackers.


SPONSORSHIP

Tahoe is sponsored by Allmydata, Inc. [14], a provider of commercial
backup services.  Allmydata, Inc. created the Tahoe project, and
contributes hardware, software, ideas, bug reports, suggestions,
demands, and money (employing several Tahoe hackers and instructing
them to spend part of their work time on this Free Software project).
Also they award customized t-shirts to hackers who find security flaws
in Tahoe (see http://hacktahoe.org ).  Thank you to Allmydata, Inc. for
their generous and public-spirited support.


Zooko Wilcox-O'Hearn
on behalf of the allmydata.org team

Special acknowledgment goes to Brian Warner, whose superb engineering
skills and dedication are primarily responsible for the Tahoe
implementation, and largely responsible for the Tahoe design as well,
not to mention most of the docs and many other things besides.

February 13, 2009
Boulder, Colorado, USA

[1] http://allmydata.org/trac/tahoe/browser/relnotes.txt?rev=2789
[2] http://allmydata.org/trac/tahoe/browser/NEWS
[3] http://allmydata.org/trac/tahoe/browser/docs/known_issues.txt
[4] http://allmydata.org/trac/tahoe/wiki/RelatedProjects
[5] http://allmydata.org/trac/tahoe/wiki/Dev
[6] http://allmydata.org/trac/tahoe/wiki/UseCases
[7] http://allmydata.org/trac/tahoe/browser/COPYING.GPL
[8] http://allmydata.org/source/tahoe/trunk/COPYING.TGPPL.html
[9] http://allmydata.org/source/tahoe/trunk/docs/install.html
[10] http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev
[11] http://allmydata.org/trac/tahoe/roadmap
[12] http://allmydata.org/trac/tahoe/browser/CREDITS?rev=2677
[13] http://allmydata.org/trac/tahoe/wiki/Dev
[14] http://allmydata.com



From barry at python.org  Fri Feb 13 21:15:38 2009
From: barry at python.org (Barry Warsaw)
Date: Fri, 13 Feb 2009 21:15:38 -0500
Subject: RELEASED Python 3.0.1
Message-ID: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On behalf of the Python development team, I'm happy to announce the  
availability of Python 3.0.1, the first bug fix release of Python  
3.0.  Version 3.0.1 fixes dozens of bugs reported since the release of  
Python 3.0 on December 3rd, 2008.

Python 3.0 represents a major milestone in Python's history.  This new  
version of the language is incompatible with the 2.x line of releases,  
while remaining true to BDFL Guido van Rossum's vision.

For more information, links to documentation, and downloadable  
distributions, see the Python 3.0.1 release page:

     http://www.python.org/download/releases/3.0.1/

To report bugs in Python 3.0.1, please submit them to the issue  
tracker at:

     http://bugs.python.org/

Enjoy!
Barry

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2lHLjRdQaG0=
=vy0O
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From fetchinson at googlemail.com  Fri Feb 13 21:28:22 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 13 Feb 2009 18:28:22 -0800
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <fbe2e2100902131828wac87b0bh7f23fbc7d6a43db@mail.gmail.com>

> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
>
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

There is no question about it in my mind that wrapping C is easier.
Reason being that python is written in C and not C++.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From benjamin at python.org  Fri Feb 13 21:40:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 14 Feb 2009 02:40:32 +0000 (UTC)
Subject: pdb in 3.0 very buggy (Win XP Home)
References: <8a640af7-41e9-4de6-8b18-fa18c3448b64@v5g2000pre.googlegroups.com>
Message-ID: <loom.20090214T023946-775@post.gmane.org>

Aaron Brady <castironpi <at> gmail.com> writes:

> 
> Hi, got a freeze when running 'pdb' in 3.0.

This is a known issue because of the rewrite of the IO library in 3.0. It will
hopefully be fixed in 3.1. See http://bugs.python.org/issue3618 for more
information. 






From clp2 at rebertia.com  Fri Feb 13 21:40:56 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 13 Feb 2009 18:40:56 -0800
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <50697b2c0902131840h6000f2adkb1c1011a33d8189b@mail.gmail.com>

On Fri, Feb 13, 2009 at 5:35 PM,  <argo785 at gmail.com> wrote:
> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
>
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

You're asking two separate questions here.

(1) For Python bindings, is it easier to wrap C, or C++ libraries?
As Daniel points out, C is easier to wrap because CPython itself is
written in C, and C++ cannot be linked directly to C.

(2) Is it easier to use C or C++ bindings from Python code?
Interface-wise, the C++ bindings would be easier to work with at the
Python level as they are object-oriented.

In practice, C libraries are usually wrapped because that's easier to
do. However, to compensate for their procedural interface, people
often write another module on top of the raw Python bindings to expose
a public interface that appears more object-oriented, and make the
lower-level module internal/private.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sammo2828 at gmail.com  Fri Feb 13 23:01:22 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 13 Feb 2009 20:01:22 -0800 (PST)
Subject: String concatenation performance with +=
Message-ID: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>

String concatenation has been optimized since 2.3, so using += should
be fairly fast.

In my first test, I tried concatentating a 4096 byte string 1000 times
in the following code, and the result was indeed very fast (12.352 ms
on my machine).

import time
t = time.time()
mydata = ""
moredata = "A"*4096
for i in range(1000):
    mydata += moredata # 12.352 ms
print "%0.3f ms"%(1000*(time.time() - t))

However, I got a different result in my second test, which is
implemented in a class with a feed() method. This test took 4653.522
ms on my machine, which is 350x slower than the previous test!

class StringConcatTest:
    def __init__(self):
        self.mydata = ""

    def feed(self, moredata):
        self.mydata += moredata # 4653.522 ms

test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)
print "%0.3f ms"%(1000*(time.time() - t))

Note that I need to do something to mydata INSIDE the loop, so please
don't tell me to append moredata to a list and then use "".join after
the loop.

Why is the second test so much slower?


From benjamin at python.org  Fri Feb 13 23:12:29 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 14 Feb 2009 04:12:29 +0000 (UTC)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
Message-ID: <loom.20090214T040939-854@post.gmane.org>

Sammo <sammo2828 <at> gmail.com> writes:

> 
> String concatenation has been optimized since 2.3, so using += should
> be fairly fast.

This is implementation dependent and shouldn't be relied upon.

> 
> Note that I need to do something to mydata INSIDE the loop, so please
> don't tell me to append moredata to a list and then use "".join after
> the loop.

Then why not just mutate the list and then call "".join?

> 
> Why is the second test so much slower?

Probably several reasons:

1. Function call overhead is quite large compared to these simple operations.
2. You are resolving attribute names.






From benjamin.kaplan at case.edu  Fri Feb 13 23:46:12 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 23:46:12 -0500
Subject: RELEASED Python 3.0.1
In-Reply-To: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
Message-ID: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>

On Fri, Feb 13, 2009 at 9:15 PM, Barry Warsaw <barry at python.org> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On behalf of the Python development team, I'm happy to announce the
> availability of Python 3.0.1, the first bug fix release of Python 3.0.
>  Version 3.0.1 fixes dozens of bugs reported since the release of Python 3.0
> on December 3rd, 2008.
>
> Python 3.0 represents a major milestone in Python's history.  This new
> version of the language is incompatible with the 2.x line of releases, while
> remaining true to BDFL Guido van Rossum's vision.
>
> For more information, links to documentation, and downloadable
> distributions, see the Python 3.0.1 release page:
>
>    http://www.python.org/download/releases/3.0.1/
>
> To report bugs in Python 3.0.1, please submit them to the issue tracker at:
>
>    http://bugs.python.org/
>
> Enjoy!
> Barry



Any chance of getting a Mac installer for this one?
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From steve at pearwood.info  Fri Feb 13 23:47:19 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 15:47:19 +1100
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<mailman.9438.1234474583.3487.python-list@python.org>
Message-ID: <01a64287$0$16735$c3e8da3@news.astraweb.com>

Martin wrote:

> Hi,
> 
> at first I wanted to file this under meta-discussions, but your lost
> paragraph got me thinking...
> 
> 2009/2/12 Christian Heimes <lists at cheimes.de>:
>> Nobody is going to stop you from creating a large bundle of useful
>> extensions as long as you follow the licenses. In fact lots of people
>> may appreciate a bundle. But the Python core package will always stay
>> small and agile.
> 
> How does "small and agile" work with "batteries included"?

Well, it certainly isn't agile without batteries.


>>From my point of view:
> 
> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). 

No, agile describes the language. It's easy to get things done *with*
Python. You're asking whether the Python-dev development process of getting
packages added to the standard library is agile. It absolutely is not, and
that is by design: python-dev doesn't want to fill the std lib up with
unnecessary, unused and buggy batteries just because one or two people
request them.

> I'm pretty sure other people 
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)

The process for getting modules added to the std lib is on the Python
website.

http://www.python.org/dev/peps/pep-0002/

If you have a library you want added, go right ahead and make a PEP.


> small::
>  just the opposite of "batteries included"

Says who? Batteries can be small, and adding a few new batteries to the pile
doesn't necessarily make the pile significantly bigger.

Small means it doesn't have unnecessary batteries.


 
> My absolute favorite would be
> 
>  * python as just python (no standard lib)

Would be a toy.

>  * a (rather) fast moving standard lib available as an addon download

No no no, the std lib needs to be conservative, so that if you write code
that relies on the std lib, you can be confident that it will work
anywhere. The core language and std library are conservative, slowly
changing, so that developers have stability. You don't have to write code
like this:

if version == 2.5:
    code block
elif version == 2.5.1b:
    different code block
elif version == 2.5.1:
    still different code block
elif version == 2.5.2:
    if exists(module):
        code block
    else:
        something different again
elif version == 2.5.3:
     ...


If you want to live on the bleeding edge, with rapidly changing APIs and
libraries, they have a repository for that. It's called "the Internet".




-- 
Steven



From notvalid2 at sbcglobal.net  Fri Feb 13 23:58:33 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 20:58:33 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
Message-ID: <mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>

Scott David Daniels wrote:
> W. eWatson wrote:
>> Terry Reedy wrote:
>>> W. eWatson wrote:
>>>>  From Diez above.
>>>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>>>> run it
>>>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>>>> pyhton-file your app is in. That's all that there is to it.
>>>>
>>>> So this is the absolute truth? No wiggle room? One can never use a 
>>>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>>>> doesn't issue a standard warning that says, "Get out of here with 
>>>> your Tkinter program, it will fail when you try to run it here. You 
>>>> have entered Tkinter hell. Good-bye."
>>>
>>> Re-read my post about kids fighting to control a television.  Maybe 
>>> they work together, maybe they crash the TV.  Hard to predict.
>>>
>>> ***ANY*** Python program that tries to grab and control the same 
>>> resources that TK does may conflict with it.  There is no way that 
>>> IDLE can have a list of, for instance, all event-grabbing mainloop 
>>> programs.
>>>
>> OK, enough tinkering with the code and others matters on my end trying 
>> to find a work around. Somehow after much successful use of IDLE's 
>> execution facility, I've stepped on an invisible banana peel. I think 
>> it's evident that I'm not going around this problem easily with the 
>> IDLE execution attempts, and that another solution is required.
> That's correct, but you still don't understand _why_ it is correct.
> I suggest you re-read the thread and try to understand everything you
> are being told.
> 
>> First, I think somewhere up the thread someone suggested that Active 
>> pythonWin is not dependent upon Tk, correct? Therefore, it is immune 
>> from such problems, correct?
> 
> Wrong.  I was the one who said that ActiveState had a product to debug
> Python programs across a nertwork connection.  The product is _not_
> ActivePython (the freely distributed system), but rather the Komodo IDE,
> which does cost money.
I'm pretty sure it wasn't you, and had no relationship to what you brought 
up earlier several messages up the thread. There are other forums.
> 
>> Finally, we can probably agree that I can continue to use IDLE for 
>> editing and syntax checking, but to "guarantee" successful execution 
>> of the program, I can just double-click on the py file in my folder. 
>> Perhaps there is a better way than clicking on it in the folder. For 
>> example, putting it on the desktop. As I look at the folder, previous 
>> copies only differ by a digit, I can easily find myself executing an 
>> earlier version, differing as Dev4, to Dev5 at the end of each name.
> 
> OK, you are using the oldest and least useful revision control system,
> "rename and remember."  I'd suggest you get and use bazaar, but you'll
> just ask for shortcuts on how to use it without understanding what it does.
It works for me, and, frankly, I'm not interested in going to Linux, SunOS 
or other "revision systmes". These are way in my distant past, and the only 
reason I'm currently, and begrudgingly, once again writing programs is that 
the Python software program I am using is limited in its ability. I've 
finally, after 2-3 years of hoping someone else would do it, taken up the 
torch to add new features. Frankly, I'd rather be doing something else with 
my time.

And, yes, you are somewhat correct in your earlier assessment of my goals, 
the sooner this is over the better. You may not like my philosophy, but it 
serves me well at the moment, and I'm moving ahead nicely now.

As I recall from the old movie Desk Set, a conversation between their two 
characters regarding a puzzle he was about to give her as a test of her 
office abilities: Tracy cautions Hepburn, "Never assume!" before relating 
the famous "detective" problem. Never assume.

Nevertheless, thank you for your responses.
Be kind to your keyboard.

Cheers.
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Sat Feb 14 00:03:13 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 21:03:13 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9514.1234565868.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>	<mailman.9470.1234502626.3487.python-list@python.org>	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
Message-ID: <Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>

...
> How can it?  It's not IDLE's problem, it's yours.
> 
>> Finally, we can probably agree that I can continue to use IDLE for 
>> editing and syntax checking, but to "guarantee" successful execution 
>> of the program, I can just double-click on the py file in my folder. 
>> Perhaps there is a better way than clicking on it in the folder.
> 
> Typing at a command prompt.
> 
>> For example, putting it on the desktop.
> 
> This causes an extra file read as Windows indirects through the desktop
> link.  It's unlikely to be a noticeable delay at startup, but I'd
> hesitate to call it "better".
> 
>> As I look at the folder, previous copies only differ by a digit, I can 
>> easily find myself executing an earlier version, differing as Dev4, to 
>> Dev5 at the end of each name.
> 
> I'd suggest spending a while reading up on version control systems.
> 
See my response to Scott. Thanks for your reply.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From steve at pearwood.info  Sat Feb 14 00:37:01 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:37:01 +1100
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
Message-ID: <01a64e2d$0$20655$c3e8da3@news.astraweb.com>

TechieInsights wrote:

> On Feb 12, 9:03?am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
>>
>> Thanks.
> 
> in 2.5 and above you can do
> if any(i%3 == 0, i%5 == 0)

[nitpick: you need an additional set of brackets inside the call to any]

I love it! A totally unnecessary creation of a tuple and a function call
instead of a straight-forward 'or' expression. Can we make this simple task
even more obfuscated?

not all( (i%3 != 0, i%5 !=0) )

Still not convoluted enough. 

all( (sum(int(c) for c in str(i))%3 in (1, 2), 
    str(i).endswith(chr(53)) - 1, 
    str(i).endswith(chr(48)) - 1) ) - 1

Hmmm... how can I get rid of that pesky %3?

all( (divmod( sum(int(c) for c in str(i)), 
    41^42)[1] in (1, 2), 
    str(i).endswith(chr(53)) - 1, 
    str(i).endswith(chr(48)) - 1) ) - 1

Okay, that makes my brain hurt. I think it will do.

:-)



-- 
Steven



From michele.simionato at gmail.com  Sat Feb 14 00:38:15 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 13 Feb 2009 21:38:15 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
Message-ID: <6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com>

On Feb 14, 12:56?am, Gustavo Narea <m... at gustavonarea.net> wrote:
> Hello, everybody.
>
> I have this signature-changing decorator
> <http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
> which I
> want to turn into a signature-preserving one. Here's my try
> <http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
> but I get
> this error:http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wra...
>
> What am I doing wrong? I think it looks like this example:http://pypi.python.org/pypi/decorator#async
>
> Thanks in advance.
>
> ? - Gustavo.
>
> PS: functols.wrap is not an option because my code has to work with
> Python 2.4+.

Difficult to see what is happening, since you have so many
dependencies. However, from the traceback I would say that
you are passing to the decorator a function with a __name__
attribute which is None. I would insert a call to pdb here

def __call__(self, func):
        import pdb; pdb.set_trace()
        return decorator(self.call, func)

and I would inspect func.__name__.

HTH,

                                 M.Simionato


From steve at pearwood.info  Sat Feb 14 00:41:09 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:41:09 +1100
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
	<3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
Message-ID: <01a64f24$0$20669$c3e8da3@news.astraweb.com>

Damon wrote:

> Use Visual Studio to program a .net application using Windows Forms.
> Run it in Mono on Windows, or OS X, or Linux.
...
> Also, you can quibble whether it's Visual
> Studio that tries to address this, or the Mono effort.

There's no quibble. It's obviously Mono. How can you possible justify the
suggestion that it could be Visual Studio? That's rather like saying that
American electrical plugs fit perfectly into Australian power sockets
because there are adaptors.


-- 
Steven



From sammo2828 at gmail.com  Sat Feb 14 00:44:12 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 13 Feb 2009 21:44:12 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
Message-ID: <748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>

Okay, this is what I have tried for string concatenation:

1. Using += implemented using simple operations (12 ms)
2. Using += implemented inside a class (4000+ ms)
3. Using "".join implemented using simple operations (4000+ ms)
4. Using "".join implemented inside a class (4000+ ms)

On Feb 14, 3:12?pm, Benjamin Peterson <benja... at python.org> wrote:
> Sammo <sammo2828 <at> gmail.com> writes:
>
> > String concatenation has been optimized since 2.3, so using += should
> > be fairly fast.
>
> This is implementation dependent and shouldn't be relied upon.
>
> > Note that I need to do something to mydata INSIDE the loop, so please
> > don't tell me to append moredata to a list and then use "".join after
> > the loop.
>
> Then why not just mutate the list and then call "".join?

AFAIK, using list mutation and "".join only improves performance if
the "".join is executed outside of the loop. In fact, in Python 2.5.2,
using "".join inside the loop is actually much slower compared to my
original test, which concatenates using +=.

My original test with simple operations took 12 ms to run:

import time
t = time.time()
mydata = ""
moredata = "A"*4096
for i in range(1000):
    mydata += moredata # 12.352 ms
    # do some stuff to mydata
    # ...
print "%0.3f ms"%(1000*(time.time() - t))

New code modified to mutate the list, then call "".join now takes 4417
ms to run. This is much slower!

import time
t = time.time()
mydata = []
moredata = "A"*4096
for i in range(1000):
    mydata.append(moredata)
    mydata = ["".join(mydata)]
    # do some stuff to mydata
    # ...

Using list mutation and "".join, implemented in a class. This took
4434 ms to run, which is again much slower than the original test.
Note that it is about the same speed as using += implemented in a
class.

import time
moredata = "A"*4096
class StringConcatTest:
    def __init__(self):
        self.mydata = []

    def feed(self, moredata):
        self.mydata.append(moredata)
        self.mydata = ["".join(self.mydata)]
        # do some stuff to self.mydata
        # ...

test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)
print "%0.3f ms"%(1000*(time.time() - t))


> > Why is the second test so much slower?
>
> Probably several reasons:
>
> 1. Function call overhead is quite large compared to these simple operations.
> 2. You are resolving attribute names.

The main problem I need help with is how to improve the performance of
the code implemented in a class. It is currently 350x slower than the
first test using simple operations, so surely there's got to be a way.


From steve at pearwood.info  Sat Feb 14 00:47:57 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:47:57 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
Message-ID: <01a650bd$0$31512$c3e8da3@news.astraweb.com>

Benjamin Peterson wrote:

> Sammo <sammo2828 <at> gmail.com> writes:
> 
>> String concatenation has been optimized since 2.3, so using += should
>> be fairly fast.
> 
> This is implementation dependent and shouldn't be relied upon.

It's also a fairly simple optimization and really only applies to direct
object access, not items or attributes.

>>> Timer('s += "x"', 's = ""').repeat(number=100000)
[0.067316055297851562, 0.063985109329223633, 0.066659212112426758]

>>> Timer('s[0] += "x"', 's = [""]').repeat(number=100000)
[3.0495560169219971, 2.2938292026519775, 2.2914319038391113]

>>> Timer('s.s += "x"', 
... 'class K(object): pass \ns=K();s.s = ""').repeat(number=100000) 
[3.3624241352081299, 2.3346412181854248, 2.9846079349517822]



>> Note that I need to do something to mydata INSIDE the loop, so please
>> don't tell me to append moredata to a list and then use "".join after
>> the loop.
> 
> Then why not just mutate the list and then call "".join?

Yes, there almost certainly is a way to avoid the repeated concatenation.


>> Why is the second test so much slower?
> 
> Probably several reasons:
> 
> 1. Function call overhead is quite large compared to these simple
> operations. 2. You are resolving attribute names.

3. Because the optimization isn't applied in this case.


-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:06:02 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:06:02 +1100
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>	<mailman.9320.1234344687.3487.python-list@python.org>
	<pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
	<mailman.9413.1234459492.3487.python-list@python.org>
Message-ID: <01a654fa$0$20662$c3e8da3@news.astraweb.com>

Terry Reedy wrote:

> Steven D'Aprano wrote:
>> On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:
>> 
>>>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>> def fact(n):
>>>>>     if n < 0: raise ValueError
>>>>>     if n = 0: return 1
>>>>>     return fact(n-1)*n
>>>>>
>>>>> At the risk of premature optimization, I wonder if there is an idiom
>>>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>>>> recursive calls?
>>> Reverse the test order
>>>
>>> def fact(n):
>>>      if n > 0: return fact(n-1)*n
>>>      if n == 0: return 1
>>>      raise ValueError
>>>
>>> You must test recursive versus terminal case every call in any case.
>>> Nearly always, the first test passes and second is not done. You only
>>> test n==0 once, either to terminate or raise exception. This works for
>>> any integral value and catches non-integral values. (There is some delay
>>> for that, but only bad calls are penalized.)
>> 
>> Nice try, but in fact no.
> 
> I meant non-integral numbers.  Others inputs are outside the usual spec
> for fact().

I thought I had made it clear that fact() was just an illustration of a
recursive function, and the test n < 0 was just a stand-in for a more
expensive test. It was toy example to illustrate a general question.
Perhaps I could have made it more obvious with a less concrete example.
Sorry for the confusion.


> You asked about "an idiom for avoiding the unnecessary test 
> for n <= 0 in the subsequent recursive calls?" and I gave you that.  You
> should have thanked me.

I did thank everybody who responded. That included you. I do appreciate your
suggestions, even if I ultimately choose to do something else.


[...]
>> You're relying on arbitrary ordering of types in Python 2.x,
> 
> No I'm not.  I don't even know what you mean by that claim.

What I understood was that you expected fact(some_arbitrary_object) to raise
a ValueError. This works if some_arbitrary_object happens to be ordered
less than 0, which only works at all because of the specific arbitrary
ordering of types in Python 2.x. In Python 3 it won't work at all.

>> and of course in Python 3 that fails altogether.
> 
> In 3.0, which is what I use, the comparison 'n>0' raises an exception
> for non-numbers, as it should.  To me, that is success.  What else would
> you want?

I might want not to expose exceptions from the implementation, and instead
raise my own exception. For fact(), I might choose to do what you did, but
for a more complex test, arbitrary objects might fail anywhere with
potentially misleading error messages.

It's a perfectly legitimate approach to let unexpected objects fail in
unexpected ways. The advantage is that it's nice and lightweight. But it's
also a legitimate approach to have a little more control over what
exceptions are raised.



-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:08:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:08:58 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<01a650bd$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <01a655a9$0$20662$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:

> Benjamin Peterson wrote:
> 
>> Sammo <sammo2828 <at> gmail.com> writes:
>> 
>>> String concatenation has been optimized since 2.3, so using += should
>>> be fairly fast.
>> 
>> This is implementation dependent and shouldn't be relied upon.
> 
> It's also a fairly simple optimization and really only applies to direct
> object access, not items or attributes.
> 
>>>> Timer('s += "x"', 's = ""').repeat(number=100000)
> [0.067316055297851562, 0.063985109329223633, 0.066659212112426758]

Oops, sorry, I should have said... Timer is timeit.Timer.


-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:33:21 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:33:21 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>
Message-ID: <01a65b61$0$30497$c3e8da3@news.astraweb.com>

Sammo wrote:

> Okay, this is what I have tried for string concatenation:
> 
> 1. Using += implemented using simple operations (12 ms)
> 2. Using += implemented inside a class (4000+ ms)
> 3. Using "".join implemented using simple operations (4000+ ms)
> 4. Using "".join implemented inside a class (4000+ ms)


I think you're doing more work than you need to. Here are my results:

>>> def join_test():
...     L = []
...     block = "abcdefghijklmnopqrstuvwxyz"*1000
...     for i in xrange(1000):
...             L.append(block)
...     return ''.join(L)
... 
>>> def concat_test():
...     s = ""
...     block = "abcdefghijklmnopqrstuvwxyz"*1000
...     for i in xrange(1000):
...             s += block
...     return s
... 
>>> assert join_test() == concat_test()
>>>
>>> from timeit import Timer
>>> Timer('concat_test()', 
... 'from __main__ import concat_test').repeat(number=100) 
[5.397799015045166, 4.3106229305267334, 4.3492171764373779]
>>> Timer('join_test()', 
... 'from __main__ import join_test').repeat(number=100) 
[4.5378072261810303, 3.9887290000915527, 3.919511079788208]


The join() idiom is slightly faster than repeated concatenation, even with
the optimization. If you're not seeing that result, you need to consider
what extra work you're doing that you don't need to.


>> Then why not just mutate the list and then call "".join?
> 
> AFAIK, using list mutation and "".join only improves performance if
> the "".join is executed outside of the loop. 

Naturally. If you needlessly join over and over again, instead of delaying
until the end, then you might as well do string concatenation without the
optimization.

join() isn't some magical function that makes your bugs go away. You have to
use it sensibly. What you've done is a variant of Shlemiel the
road-painter's algorithm:

http://www.joelonsoftware.com/articles/fog0000000319.html



Perhaps you have to repeatedly do work on the *temporary* results in between
loops? Something like this toy example?

s = ""
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    s += block
    # do something with the partially concatenated string
    print "partial length is", len(s)
# all finished
do_something(s)

You've written that using join:

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the partially concatenated string
    L = [ ''.join(L) ]
    print "partial length is", len(L[0])
# all finished
s = ''.join(L)
do_something(s)

Okay, but we can re-write that more sensibly:

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the partially concatenated string
    print "partial length is", sum(len(item) for item in L)
# all finished
s = ''.join(L)
do_something(s)

There's still a Shlemiel algorithm in there, but it's executed in fast C
instead of slow Python and it doesn't involve copying large blocks of
memory, only walking them, so you won't notice as much. Can we be smarter?

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
partial_length = 0
for i in xrange(1000):
    L.append(block)
    partial_length += len(block)
    # do something with the partially concatenated string
    print "partial length is", partial_length
# all finished
s = ''.join(L)
do_something(s)


Naturally this is a toy example, but I think it illustrates one technique
for avoiding turning an O(N) algorithm into an O(N**2) algorithm. 

Good luck!


-- 
Steven



From bj_666 at gmx.net  Sat Feb 14 01:39:02 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 14 Feb 2009 06:39:02 GMT
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
	<mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>
Message-ID: <6vn786Fl3f4sU1@mid.uni-berlin.de>

On Fri, 13 Feb 2009 20:58:33 -0800, W. eWatson wrote:

> Scott David Daniels wrote:
>> OK, you are using the oldest and least useful revision control system,
>> "rename and remember."  I'd suggest you get and use bazaar, but you'll
>> just ask for shortcuts on how to use it without understanding what it
>> does.
> It works for me, and, frankly, I'm not interested in going to Linux,
> SunOS or other "revision systmes".

Linux and SunOS are *operating systems*, something completely different 
from *revision control systems*.

A revision or version control system (VCS) lets you record the evolution 
of your software.  You can tag versions with symbolic names like "Dev4" 
or "Release-1.0" and can ask the VCS for a copy of the sources with a 
given tag or even date.

Ciao,
	Marc 'BlackJack' Rintsch


From eliben at gmail.com  Sat Feb 14 01:47:37 2009
From: eliben at gmail.com (eliben)
Date: Fri, 13 Feb 2009 22:47:37 -0800 (PST)
Subject: data structure for ASTs in Python-written parsers
Message-ID: <bce9b53d-888b-4639-b3cb-076ee6b281c2@l16g2000yqo.googlegroups.com>

Hello,

The Python interpreter uses ASDL (http://www.cs.princeton.edu/~danwang/
Papers/dsl97/dsl97.html) to describe the AST resulting from parsing.
In previous versions, there was another AST being used by the compiler
module - ast.txt and astgen.py in tools/compiler in the Python 2.5
source. However, as far as I understand this has been discontinued in
later Pythons.

I'm writing parsers in pure Python (with PLY), and wonder about the
best representation to use for the AST. So far I've been using a self-
cooked solution similar to ast.txt/astgen.py, but I was wondering
about ASDL.

Looking at it closely, it seems to me that ASDL is much more suitable
for statically-typed languages like C and Java than the duck-typed
Python. The assignment of types of nodes seems superfluous when "real"
Node classes can be used. Wherever dispatching is needed on the type
enum, in Python we can dispatch on isinstance(), and traversal using
reflection (automatic AST walkers) is possible in Python on the simple
representation, while ASDL just adds another complexity level.

Does this make sense? I realize Python itself uses ASDL because its
parser is coded in C. But what would you prefer as a representation
for parsers written *in* Python?

Thanks in advance


From steve at pearwood.info  Sat Feb 14 02:19:17 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 18:19:17 +1100
Subject: doctest fails to see tests in decorated functions
Message-ID: <01a66625$0$21875$c3e8da3@news.astraweb.com>

I've just spotted a bug in doctest that it fails to see tests inside
decorated functions. It's been reported before:

http://bugs.python.org/issue1108

but the patch submitted doesn't work for me. I have a test script on the
page demonstrating the problem. Can anyone give me some clues as to a
work-around? I tried adding objects to __test__ but testmod() still failed
to pick up their tests.


if __name__ == '__main__':
    import doctest
    import types
    __test__ = {}
    allowed = [str, types.FunctionType, 
        types.ClassType, types.GeneratorType,
        types.MethodType, types.UnboundMethodType]
    for name in dir():
        obj = vars()[name]
        if type(obj) in allowed:
            __test__[name] = obj
    doctest.testmod()



-- 
Steven



From martijnsteenwijk at gmail.com  Sat Feb 14 03:04:46 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Sat, 14 Feb 2009 00:04:46 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
Message-ID: <c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>

On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
> martijnsteenw... at gmail.com wrote:
> > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > express, but unfortunately this doesn't change anything in running the
> > setup file. Unfortunately, still no pyd file is produced...
>
> > Did I something wrong?
>
> Yeah, you installed the C# environment. Python is written in C, so you
> have to get Visual Studio C++ 2008. However a recent version of MinGW32
> is sufficient to build most extensions.
>
> Christian

Hi Christian,

Thanks for your reply. In mean time, I discovered the C++ thing
already ;-).
Now I installed MinGW, but still the same happens. If I run the setup
file, the same output comes on the command line and no pyd file is
created... GRRR

Any suggestions?

Martijn


From Nicolas.Thiery at u-psud.fr  Sat Feb 14 03:19:53 2009
From: Nicolas.Thiery at u-psud.fr (=?ISO-8859-1?Q?Nicolas_M=2E_Thi=E9ry?=)
Date: Sat, 14 Feb 2009 00:19:53 -0800 (PST)
Subject: Pickling classes (not class instances)
References: <582b45b4-ed93-4a05-9c7b-7f72da34861d@r36g2000prf.googlegroups.com>
Message-ID: <aa85e37a-e2c7-4b05-b19d-6584e7920ead@l16g2000yqo.googlegroups.com>

         Dear python developers,

I got no answer to my previous post on this thread "Pickling classes
(not class instances)".
This issue is a show stopper for our project. Any suggestion for where
to ask?

Thanks in advance!

Best regards,
					Nicolas

> Purpose of this e-mail:
> -----------------------
>
> How to customize how a class (not an instance of a class!!!) is
> pickled?
>
> Example:
> ==============================================================================
> class metaclass(type):
>     def __new__(mcs, name, bases, dict):
>         print " running metaclass.__new__"
>         return type.__new__(mcs, name, bases, dict)
>     #
>     def __reduce_class__(self):
>         print "reducing a class"
>         # do the real work
>
> c = metaclass("foo", (object,), dict())
>
> import copy_reg
> copy_reg.pickle(metaclass, metaclass.__reduce_class__)
>
> pickle.dumps(c)
> ---------------------------------------------------------------------------
> PicklingError                             Traceback (most recent call
> last)
> ...
> PicklingError: Can't pickle <class '__main__.foo'>: it's not found as
> __main__.foo
> ==============================================================================
>
> Context:
> --------
>
> I am working on the Sage project (www.sagemath.org), and more
> precisely on the category infrastructure. The code is building lots of
> classes on the fly by composing preexisting classes by inheritance
> (for the curious, see the doc of the class Category inhttp://sage.math.washington.edu:2144/file/1567cea09170/categories-nt....).
>
> Since those classes are built on the fly, they cannot be pickled with
> the default mechanism of name lookup. A proper pickling would be to
> rebuild the class anew. Nothing problematic, except for the question
> above.
>
> Discussion:
> -----------
>
> It sounds like copy_reg would be the natural way to go (as in the
> example above). However, its documentation suggests that it explicitly
> is not intended for pickling classes, e.g. first paragraph of:
>
> http://docs.python.org/library/copy_reg.html#module-copy_reg
>
> is:
>
>   The copy_reg module provides support for the pickle and cPickle
>   modules. The copy module is likely to use this in the future as
>   well.  It provides configuration information about object
>   constructors which are not classes. Such constructors may be factory
>   functions or class instances.
>
> And indeed, looking up at the code of pickle (l. 289-299 of pickle.py)
> (and similarly in cpickle), the copy-reg dispatch is explicit bypassed
> for metaclasses:
>
>         # Check for a class with a custom metaclass; treat as regular
> class
>         try:
>             issc = issubclass(t, TypeType)
>         except TypeError: # t is not a class (old Boost; see SF
> #502085)
>             issc = 0
>         if issc:
>             self.save_global(obj)
>             return
>
>         # Check copy_reg.dispatch_table
>         reduce = dispatch_table.get(t)
>
> Which causes the failure above.
>
> Is there a specific reason for this restriction?
>
> Would it be thinkable to move up the copy reg dispatch before the
> metaclass treatment in pickle and cPickle? I did it locally, and it
> fixed my problem.
>
> If not, what would be the right way to achieve this?
>
> Many thanks in advance!
>
> Best regards,
>                                 Nicolas
> --
> Nicolas M. Thi?ry "Isil" <nthi... at users.sf.net>http://Nicolas.Thiery.name/



From martijnsteenwijk at gmail.com  Sat Feb 14 03:31:59 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Sat, 14 Feb 2009 00:31:59 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
	<c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>
Message-ID: <3d42c023-07b5-4216-a217-d67cff580422@h20g2000yqn.googlegroups.com>

On 14 feb, 09:04, martijnsteenw... at gmail.com wrote:
> On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
>
> > martijnsteenw... at gmail.com wrote:
> > > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > > express, but unfortunately this doesn't change anything in running the
> > > setup file. Unfortunately, still no pyd file is produced...
>
> > > Did I something wrong?
>
> > Yeah, you installed the C# environment. Python is written in C, so you
> > have to get Visual Studio C++ 2008. However a recent version of MinGW32
> > is sufficient to build most extensions.
>
> > Christian
>
> Hi Christian,
>
> Thanks for your reply. In mean time, I discovered the C++ thing
> already ;-).
> Now I installed MinGW, but still the same happens. If I run the setup
> file, the same output comes on the command line and no pyd file is
> created... GRRR
>
> Any suggestions?
>
> Martijn

Hmmm, problem fixed :-)
Downloaded the C++ compiler, runned the Visual Studio 2008 command
prompt and it works!


From martin at v.loewis.de  Sat Feb 14 03:55:47 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 14 Feb 2009 09:55:47 +0100
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <49968713.4080705@v.loewis.de>

> Any chance of getting a Mac installer for this one?

Chances are non-zero, yes.

Martin


From castironpi at gmail.com  Sat Feb 14 04:26:20 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 14 Feb 2009 01:26:20 -0800 (PST)
Subject: Pickling classes (not class instances)
References: <582b45b4-ed93-4a05-9c7b-7f72da34861d@r36g2000prf.googlegroups.com>
	<aa85e37a-e2c7-4b05-b19d-6584e7920ead@l16g2000yqo.googlegroups.com>
Message-ID: <f9547c14-cb31-43cb-82b1-351f02d56136@s36g2000vbp.googlegroups.com>

On Feb 14, 2:19?am, Nicolas M. Thi?ry <Nicolas.Thi... at u-psud.fr>
wrote:
> ? ? ? ? ?Dear python developers,
>
> I got no answer to my previous post on this thread "Pickling classes
> (not class instances)".
> This issue is a show stopper for our project. Any suggestion for where
> to ask?
snip to
http://groups.google.com/group/comp.lang.python/browse_thread/thread/66c282afc04aa39c/4d9304aa0cc791c2#4d9304aa0cc791c2
> > How to customize how a class (not an instance of a class!!!) is
> > pickled?
snip
> > Is there a specific reason for this restriction?
>
> > Would it be thinkable to move up the copy reg dispatch before the
> > metaclass treatment in pickle and cPickle? I did it locally, and it
> > fixed my problem.
>
> > If not, what would be the right way to achieve this?

Hi Nicolas,

I couldn't get yours to work.  I also tried defining '__reduce__' and
'__getstate__' in the metaclass; they didn't work either.

Can you just subclass Pickler, and override the 'save' method?

> > Is there a specific reason for this restriction?

It sounds very odd.  I'm not a core dev, so I can't say.

I also tried defining '__subclasshook__' to convince 'metaclass' it is
not a subclass of 'type'.  It didn't work, but 'register' was not
working the way I wanted.

Perhaps you could define your own 'custom_type' type, which looks and
acts just like type, but just doesn't pass the 'subclass' test.  It
may be as simple as just cutting-and-pasting the TypeObject definition
from the core.




From __peter__ at web.de  Sat Feb 14 04:31:38 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 14 Feb 2009 10:31:38 +0100
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<mailman.9482.1234521740.3487.python-list@python.org>
Message-ID: <gn631q$l5b$02$1@news.t-online.com>

Gabriel Genellina wrote:

> En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>
> escribi?:
> 
>> I need some help.
>> I tried to find top n(eg. 5) similar words for a given word, from a
>> dictionary of 50,000 words.
>> I used python-levenshtein module,and sample code is as follow.
>>
>> def foo(searchword):
>>     disdict={}
>>     for word in self.dictionary-words:
>>                    distance=Levenshtein.ratio(searchword,word)
>>                    disdict[word]=distance
>>     """
>>      sort the disdict dictionary by values in descending order
>>     """
>>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>>
>>     return similarwords[:5]
> 
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - at
> least you won't waste time sorting 49995 irrelevant words...
> Anyway you should measure the time taken by the first part (Levenshtein),
> it may be the most demanding. I think there is a C extension for this,
> should be much faster than pure Python calculations.
> 

[I didn't see the original post]

You can use the distance instead of the ratio and put the words into bins of
the same length. Then if you find enough words with a distance <= 1 in the
bin with the same length as the search word you can stop looking.

You might be able to generalize this approach to other properties that are
fast to calculate and guarantee a minimum distance, e. g. set(word).

Peter


From samslists at gmail.com  Sat Feb 14 04:51:40 2009
From: samslists at gmail.com (Sam)
Date: Sat, 14 Feb 2009 01:51:40 -0800 (PST)
Subject: codecs.open and buffering modes...
References: <56a55b5c-ca64-4c84-a8a8-3912af384e4c@f40g2000pri.googlegroups.com>
Message-ID: <b1bf9217-cbdd-4ef0-8af2-16bf9b99507b@r15g2000prh.googlegroups.com>

Hmmm...no one knows the reason for the discrepancy?  Should I post on
the developers' list to see if anyone knows?

Thanks

On Feb 9, 6:19?pm, Sam <samsli... at gmail.com> wrote:
> codecs.open defaults to line buffering. ?But open defaults to using
> the system buffer size. ?Why the discrepancy? ?Is it different for a
> reason?
>
> How do these choices affect performance? ?(Particularly under Linux).
>
> Thanks



From vriolk at gmail.com  Sat Feb 14 05:08:38 2009
From: vriolk at gmail.com (coldpizza)
Date: Sat, 14 Feb 2009 02:08:38 -0800 (PST)
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <70d53ba1-7451-413a-807f-3e1021cdf8bb@d32g2000yqe.googlegroups.com>

You should have a look at twill:
   http://twill.idyll.org

It seems to be no longer maintained, but will probably do most of what
you expect. And it is built on top of mechanize.


On Feb 13, 4:04?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
>
> what is the best set of modules.
>
> As far as I understood, there is httplib, but it seems (if I understood
> well) to be incoompatible with cookielib
>
> I'm a newcomer to webautomation with python and would be thankful for
> good suggestions.
>
> I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> forgot the name) to handle parsing and filling in Forms.
>
> thanks in advance for any pointers opinions
>
> N



From vriolk at gmail.com  Sat Feb 14 05:16:41 2009
From: vriolk at gmail.com (coldpizza)
Date: Sat, 14 Feb 2009 02:16:41 -0800 (PST)
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9503.1234548080.3487.python-list@python.org>
Message-ID: <425241d1-6e51-4638-af07-9360cc5d1b24@s20g2000yqh.googlegroups.com>

And btw, Selenium scripts can be exported to Python and run under
Selenium Remote Control server.

I'd say this is the most flexible and advanced way to do webtesting,
since you can have a single script that runs with many browsers
(opera, firefox, ie, etc), and on many platforms.

And combined with HTMLTestRunner you can get beautiful test reports.

On Feb 13, 8:01?pm, Matias Surdi <matiassu... at gmail.com> wrote:
> You should give a look to Selenium. It's great.
>
> http://www.openqa.org
>
>
>
> News123 wrote:
> > Hi,
>
> > I'd like to do some web automation with python 2.5
> > - https:
> > - a cookiejar
> > - some forms to be filled in
>
> > what is the best set of modules.
>
> > As far as I understood, there is httplib, but it seems (if I understood
> > well) to be incoompatible with cookielib
>
> > I'm a newcomer to webautomation with python and would be thankful for
> > good suggestions.
>
> > I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> > forgot the name) to handle parsing and filling in Forms.
>
> > thanks in advance for any pointers opinions
>
> > N
> > --
> >http://mail.python.org/mailman/listinfo/python-list



From ssj4_dave at hotmail.com  Sat Feb 14 06:35:56 2009
From: ssj4_dave at hotmail.com (DLitgo)
Date: Sat, 14 Feb 2009 03:35:56 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>
Message-ID: <c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>

On Feb 12, 12:39?am, r <rt8... at gmail.com> wrote:
> Hello,
>
> Tkinter is a great GUI toolkit, for what it lacks in prettiness it
> more than makes up for in simple and quick GUI building. I think this
> is the main reason Tkinter continues to be Python's built-in GUI
> toolkit. It is a great place to start for those with no GUI
> experience. Sure it will never be as rich as wxPython or the like, but
> that is not what Tkinter is made for.
>
> I use Tkinter for all my tools that need a UI, and others as well. The
> only complaint i have is the poor support for image types i really
> wish there where at least support for one good image like jpg, png,
> and full color bitmaps.The canvas widget could also use a little more
> functionality, but hey maybe one day i will have time to polish it up
> a bit.

There is the Python Image Library (PIL), but when I tried to install
it I of course had to install the JPEG package as well which didn't
install correctly. After trying several times to install it (the JPEG
package that is, PIL installed fine, but I only wanted it for the
extra image support) I just gave up.

Does anyone know of a quick and easy install for PIL + JPEG for Mac OS
X (10.5)?


From greg.ewing at canterbury.ac.nz  Sat Feb 14 06:50:04 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sun, 15 Feb 2009 00:50:04 +1300
Subject: ANN: SuPy 1.2
Message-ID: <mailman.9527.1234615404.3487.python-announce-list@python.org>

SuPy 1.2 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Ruby object and class wrappers now have __class__ and __bases__ attributes
   that return the right things. As a consequence, isinstance() and
   issubclass() also work properly on Ruby objects.

- UI module made available to Python.

- Data in a module can be preserved across a Py.refresh() by giving the
   module a __keep__ attribute holding a sequence of names to preserve.

- Added a utility module to assist with managing menu items.

- Fixed some bugs in the block-passing mechanism.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From sammo2828 at gmail.com  Sat Feb 14 07:00:39 2009
From: sammo2828 at gmail.com (Sammo)
Date: Sat, 14 Feb 2009 04:00:39 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<01a650bd$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <56a6c7a9-fae7-4368-8f59-2aa7b5c8df8c@z6g2000pre.googlegroups.com>

On Feb 14, 4:47?pm, Steven D'Aprano <st... at pearwood.info> wrote:
> > Sammo <sammo2828 <at> gmail.com> writes:
> >> String concatenation has been optimized since 2.3, so using += should
> >> be fairly fast.
>
> > This is implementation dependent and shouldn't be relied upon.
>
> It's also a fairly simple optimization and really only applies to direct
> object access, not items or attributes.
>
> >> Why is the second test so much slower?
>
> > Probably several reasons:
>
> > 1. Function call overhead is quite large compared to these simple
> > operations. 2. You are resolving attribute names.
>
> 3. Because the optimization isn't applied in this case.

Thanks Steven -- that's the answer I was looking for. The += string
concatenation optimization only applies to local variables. In my
case, I incorrectly assumed it applied to attributes.

Can you point me to any references regarding the limitations of the
optimization? I guess it's another Python idiom that's documented
somewhere ...


From sammo2828 at gmail.com  Sat Feb 14 07:15:19 2009
From: sammo2828 at gmail.com (Sammo)
Date: Sat, 14 Feb 2009 04:15:19 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>
	<01a65b61$0$30497$c3e8da3@news.astraweb.com>
Message-ID: <69fe8286-a6f9-4cc5-976e-405280e4edb0@z6g2000pre.googlegroups.com>

On Feb 14, 5:33?pm, Steven D'Aprano <st... at pearwood.info> wrote:
> > AFAIK, using list mutation and "".join only improves performance if
> > the "".join is executed outside of the loop.
>
> Naturally. If you needlessly join over and over again, instead of delaying
> until the end, then you might as well do string concatenation without the
> optimization.
>
> join() isn't some magical function that makes your bugs go away. You have to
> use it sensibly. What you've done is a variant of Shlemiel the
> road-painter's algorithm:
>
> http://www.joelonsoftware.com/articles/fog0000000319.html
>
> Perhaps you have to repeatedly do work on the *temporary* results in between
> loops? Something like this toy example?
>
> s = ""
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? s += block
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", len(s)
> # all finished
> do_something(s)
>
> You've written that using join:
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? # do something with the partially concatenated string
> ? ? L = [ ''.join(L) ]
> ? ? print "partial length is", len(L[0])
> # all finished
> s = ''.join(L)
> do_something(s)
>
> Okay, but we can re-write that more sensibly:
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", sum(len(item) for item in L)
> # all finished
> s = ''.join(L)
> do_something(s)
>
> There's still a Shlemiel algorithm in there, but it's executed in fast C
> instead of slow Python and it doesn't involve copying large blocks of
> memory, only walking them, so you won't notice as much. Can we be smarter?
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> partial_length = 0
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? partial_length += len(block)
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", partial_length
> # all finished
> s = ''.join(L)
> do_something(s)
>
> Naturally this is a toy example, but I think it illustrates one technique
> for avoiding turning an O(N) algorithm into an O(N**2) algorithm.

So even though I can't delay the "".join operation until after the
loop, I can still improve performance by reducing the length of
"".join operations inside the loop. In my case, I need to temporarily
work on the latest two blocks only.

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the latest two blocks
    tmp = "".join(L[-2:])
# all finished
s = ''.join(L)
do_something(s)

Unfortunately, the downside is that the code becomes more difficult to
read compared to using the obvious +=. If only the optimization worked
for attributes ...


From me at gustavonarea.net  Sat Feb 14 07:30:08 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Sat, 14 Feb 2009 04:30:08 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com>
Message-ID: <2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com>

On Feb 14, 6:38 am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 14, 12:56 am, Gustavo Narea <m... at gustavonarea.net> wrote:
>
>
>
> > Hello, everybody.
>
> > I have this signature-changing decorator
> > <http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
> > which I
> > want to turn into a signature-preserving one. Here's my try
> > <http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
> > but I get
> > this error:http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wra...
>
> > What am I doing wrong? I think it looks like this example:http://pypi.python.org/pypi/decorator#async
>
> > Thanks in advance.
>
> >   - Gustavo.
>
> > PS: functols.wrap is not an option because my code has to work with
> > Python 2.4+.
>
> Difficult to see what is happening, since you have so many
> dependencies. However, from the traceback I would say that
> you are passing to the decorator a function with a __name__
> attribute which is None. I would insert a call to pdb here
>
> def __call__(self, func):
>         import pdb; pdb.set_trace()
>         return decorator(self.call, func)
>
> and I would inspect func.__name__.
>
> HTH,
>
>                                  M.Simionato

Thanks for your response, Michele.

This is what I get:
"""
(Pdb) func.__name__
'greetings'
(Pdb) func.__dict__
{}
(Pdb) func.__module__
'pylonsproject.controllers.root'
"""

Which seems correct to me.

By the way, I forgot to mention that what is decorated is an instance
method. I don't know if that would change something.

Thanks in advance.

  - Gustavo.


From user at domain.invalid  Sat Feb 14 07:33:46 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 13:33:46 +0100
Subject: encrypting lines from file with md5 module doesn't work?
Message-ID: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>

Hi,
I need some help with my script. I hope someone can show me the right
direction or at least explain to me what did I wrong?

I write a small script that read lines from plain text file and encrypt
each lines using md5 module. I have a small word list that contain 2000+
words, 1 word/line. Using the code below, I can save the output to
another file to use it with john the ripper (http://www.openwall.com).

Here is the part that annoys me, john recognize the output as des and
not as md5. Using the original wordlist, I tried to crack the list but
nothing has come up after waiting for almost 9 hours. Can someone please
tell me what did I wrong? Why john don't recognize the output as md5?
I'm using python 2.5.1 and I'm python noob and also don't have any
knowledge about encryption.

----------------code------------------------
import sys, md5

f = open(sys.argv[1])
obj = md5.new()

for line in f:
        if line[-1:] == '\n':
                text = line[:-1]
        obj.update(text),
        print text + ':' + obj.hexdigest()

f.close()


---------------result-----------------------
000000:670b14728ad9902aecba32e22fa4f6bd
00000000:c47532bbb1e2883c902071591ae1ec9b
111111:bf874003f752e86e6d6ba6d6df1f24a2
11111111:65a89de3000110bf37bcafdbd33df55a
121212:38a8eeb4dfb0f86aefea908365817c15
123123:f226a65a908909b83aed92661897d0c9


Thanks in advance


From zaheer.agadi at gmail.com  Sat Feb 14 07:37:57 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 14 Feb 2009 04:37:57 -0800 (PST)
Subject: Reading a file
Message-ID: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>

Hi

How do i read  a file in Python and search a particular pattern
like I have a file char.txt  which has

Mango=sweet
Sky=blue

I want to get the strings sweet and blue,How to do this..?

Thanks


From berend at dotmpe.com  Sat Feb 14 08:18:37 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Sat, 14 Feb 2009 14:18:37 +0100
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <499594C0.9020509@mrabarnett.plus.com>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<4995844C.7080104@mrabarnett.plus.com>
	<20090213145101.GC2168@iris.furrow.ath.cx>
	<499594C0.9020509@mrabarnett.plus.com>
Message-ID: <20090214131837.GB3799@iris.furrow.ath.cx>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, Feb 13, 2009 at 03:41:52PM +0000, MRAB wrote:
> Berend van Berkum wrote:
> >Yes.. tested that and SGMLParser won't let me override __init__, 
> >(SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) 
> >call).
> 
> OK, so SGMLParser needs to be initialised:
> 
> 	def __init__(self):
> 		sgmllib.SGMLParser.__init__(self)
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []

argh.. forgot about old-style supercall syntax
used sgmllib.SGMLParser(self), did not investigate the error
gonna be ashamed for a while now..

- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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=O4QU
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From google at mrabarnett.plus.com  Sat Feb 14 09:14:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 14:14:59 +0000
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
Message-ID: <4996D1E3.9040304@mrabarnett.plus.com>

Canned wrote:
> Hi,
> I need some help with my script. I hope someone can show me the right
> direction or at least explain to me what did I wrong?
> 
> I write a small script that read lines from plain text file and encrypt
> each lines using md5 module. I have a small word list that contain 2000+
> words, 1 word/line. Using the code below, I can save the output to
> another file to use it with john the ripper (http://www.openwall.com).
> 
[snip]
MD5 is a type of checksum, not a method of encryption.


From michele.simionato at gmail.com  Sat Feb 14 09:27:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 14 Feb 2009 06:27:10 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com>
Message-ID: <f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>

On Feb 14, 1:30?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> This is what I get:
> """
> (Pdb) func.__name__
> 'greetings'
> (Pdb) func.__dict__
> {}
> (Pdb) func.__module__
> 'pylonsproject.controllers.root'
> """
>
> Which seems correct to me.
>
> By the way, I forgot to mention that what is decorated is an instance
> method. I don't know if that would change something.

This is bad, func should be a function and not an instance
method (see line 49 of decorator.py). If the .signature
attribute of the FunctionMaker is missing, than that's the
reason for the AssertionError you see.
I should probably raise a clearer error message.
I lack the context to see how this could be fixed in your case, but
this a not a show stopper, you can just keep the original decorator
and forget about making it signature preserving.


From barry at python.org  Sat Feb 14 09:32:43 2009
From: barry at python.org (Barry Warsaw)
Date: Sat, 14 Feb 2009 09:32:43 -0500
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <30B69D1B-E36B-4FAA-A584-0B892E50A11C@python.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Feb 13, 2009, at 11:46 PM, Benjamin Kaplan wrote:

> Any chance of getting a Mac installer for this one?

I believe Ronald is planning to upload it soon.
Barry

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From linuxguy123 at gmail.com  Sat Feb 14 09:45:08 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Sat, 14 Feb 2009 07:45:08 -0700
Subject: Function name limit in Python ?
Message-ID: <1234622708.3786.17.camel@localhost.localdomain>

Excuse my ignorance, but is there a limit to the size of function names
in Python ?

I named a function getSynclientVersion() and I got an error when I
called it.  I renamed the same function to getSCVersion() and it called
fine.

Why ?

Thanks



From sjmachin at lexicon.net  Sat Feb 14 09:51:56 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 14 Feb 2009 06:51:56 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
	<c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>
Message-ID: <8c2d80db-f948-4221-97a1-9eb0650a8403@r15g2000prh.googlegroups.com>

On Feb 14, 7:04?pm, martijnsteenw... at gmail.com wrote:
> On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
>
> > martijnsteenw... at gmail.com wrote:
> > > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > > express, but unfortunately this doesn't change anything in running the
> > > setup file. Unfortunately, still no pyd file is produced...
>
> > > Did I something wrong?
>
> > Yeah, you installed the C# environment. Python is written in C, so you
> > have to get Visual Studio C++ 2008. However a recent version of MinGW32
> > is sufficient to build most extensions.
>
> > Christian
>
> Hi Christian,
>
> Thanks for your reply. In mean time, I discovered the C++ thing
> already ;-).
> Now I installed MinGW, but still the same happens. If I run the setup
> file, the same output comes on the command line and no pyd file is
> created... GRRR
>
> Any suggestions?

AFAIK it will attempt to use a compiler other than the one that Python
was compiled with only if specifically directed to e.g. with --
compiler=mingw32 in the command line when running setup.py.



From dear.jay.logan at gmail.com  Sat Feb 14 10:03:54 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Sat, 14 Feb 2009 07:03:54 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
	<pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>
	<48b49eef-b3c1-4a9d-bf38-ad24c2b89622@t11g2000yqg.googlegroups.com>
Message-ID: <f0a23305-c55c-4713-8937-3c8c5816ef52@s1g2000prg.googlegroups.com>

On Feb 13, 7:44?pm, Basilisk96 <basilis... at gmail.com> wrote:
> On Feb 12, 1:15?am, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > > I usually strive
> > > for comprehensions if a for loop can be reduced to such.
>
> > Any particular reason?
>
> Only two.
> 1.) I was impressed by their clarity and conciseness when I first
> discovered them.
> 2.) I also read now and then that simple list comprehensions are
> faster when compared with their for-loop equivalents because of the
> way comprehensions are implemented under the hood. My example is a far
> cry from a "simple" comprehension, however. :)
>
> > If there's only one call to func(), and you ignore the (probably) fixed
> > cost of jumping into a generator each time, then it shouldn't make any
> > difference.
>
> > If you are comparing one call to func() in a for loop versus three calls
> > to func() in a list comp or generator expression, then of course the for
> > loop will be more efficient.
>
> I agree. I would rather call func() only once per iteration in any
> case. I will revise it to a plain for loop with a single call.
>
> Thanks,
> -Basilisk96

Just as long as you do realize that it is possible to do what you were
looking with one call to func() using chained generators, as
demonstrated in my post above. Whichever way is clearest for you would
be the way I'd go.


From google at mrabarnett.plus.com  Sat Feb 14 10:08:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 15:08:00 +0000
Subject: Function name limit in Python ?
In-Reply-To: <1234622708.3786.17.camel@localhost.localdomain>
References: <1234622708.3786.17.camel@localhost.localdomain>
Message-ID: <4996DE50.807@mrabarnett.plus.com>

Linuxguy123 wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  I renamed the same function to getSCVersion() and it called
> fine.
> 
> Why ?
> 
Probably a just spelling mistake. Double-check that the two names are 
identical.


From ptmcg at austin.rr.com  Sat Feb 14 10:13:42 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sat, 14 Feb 2009 07:13:42 -0800 (PST)
Subject: Function name limit in Python ?
References: <mailman.9531.1234622714.3487.python-list@python.org>
Message-ID: <e3d9f52b-fbe6-41d4-8da9-060a0b6a4b70@x6g2000pre.googlegroups.com>

On Feb 14, 8:45?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
>
> I named a function getSynclientVersion() and I got an error when I
> called it. ?I renamed the same function to getSCVersion() and it called
> fine.
>
> Why ?
>

Hello again, Linuxguy123!  I see you are forging ahead in your quest
for Python knowledge.

Here is a small snippet that refutes your assertion that function name
length is a problem (but surely, you could have written this small a
test and answered your own question...):

def getSynclientVersion():
    return "1.2.3.4"

print getSynclientVersion()

prints:
1.2.3.4

Let's try something a bit longer:
def
abcdefghijklmnopqrstuvwxyz_1234567890_abcdefghijklmnopqrstuvwxyz_1234567890
():
    return "Howdy!"

print
abcdefghijklmnopqrstuvwxyz_1234567890_abcdefghijklmnopqrstuvwxyz_1234567890
()

prints:
Howdy!

So I don't think the problem you are having is the length of your
method name.

Your quest will be much more productive if, in the future, you post a
little more information with these questions:

- Post the code that you wrote - this is trickier than it sounds.  The
best post is the smallest possible extract of your code that
reproduces the error in question.

But please, DONT try to send in fresh code that you feel represents
your problem without first verifying that it does.  Many people post a
summary of their code because they don't want to post their secret
source code, or their 3000 lines of code - and then in their summary,
they fix the problem they were having.  Then c.l.py readers spend a
lot of time going "wha...?" because the posted code has no error.

- Post the exception that was returned

Probably even more helpful than posting code.  What exactly was the
problem?  Python is not really that bad at giving some informative
messages.  Perhaps you misspelled your method name:

print getSynClientVersion()

gives this error:
NameError: name 'getSynClientVersion' is not defined

It's not defined because I named it "getSynclientVersion" - with a
little 'c', not a big 'C'.

Or maybe you misused the value returned from the method:

print getSynclientVersion().length

gives:

AttributeError: 'str' object has no attribute 'length'

An error, surely, but it has nothing to do with the length of the
method name I called.


Help us help you, Linuxguy123!
-- Paul


From ptmcg at austin.rr.com  Sat Feb 14 10:19:45 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sat, 14 Feb 2009 07:19:45 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <2b4e62a9-efa8-4656-98e4-4755a10e7cac@v5g2000pre.googlegroups.com>

On Feb 11, 7:22?pm, Basilisk96 <basilis... at gmail.com> wrote:
>...
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration? ?Perhaps a lambda
> construct, but I am not sure how to go about it...?
>
> Cheers,
> Basilisk96

If func is expensive, you could try memoizing it.  Then subsequent
"calls" just do arg lookups.  Michele Simianato has posted a good
memoizing decorator on the Python wiki.

-- Paul


From gyromagnetic at gmail.com  Sat Feb 14 10:53:46 2009
From: gyromagnetic at gmail.com (gyro)
Date: Sat, 14 Feb 2009 08:53:46 -0700
Subject: confusion about variable scope in a class
Message-ID: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>

Hi,
I was writing a Python script to perform some data analyses and was
surprised by some behavior I noted. A simple test program illustrating
the behavior is below.
I do not understand why the value of 'data' is being modified. I am
obviously missing something obvious, and would certainly appreciate an
explanation of why this is happening.

Thank you.

-gf

----------

#!/bin/env python

class TestPop(object):
    def round1(self,data1):
        t = data1.pop(-1)
		
    def round2(self,data2):
        t = data2.pop(-1)
		
    def tester(self):
        data = range(10)
        self.round1(data)
        print data
        self.round2(data)
        print data

if __name__ == '__main__':
    tp = TestPop()
    tp.tester()


From andrew at acooke.org  Sat Feb 14 11:22:19 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 14 Feb 2009 13:22:19 -0300 (CLST)
Subject: confusion about variable scope in a class
In-Reply-To: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>
References: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>
Message-ID: <524bdbf505d1e37ad0807c8e97087edb.squirrel@acooke.dyndns.org>


it's not a scope issue.  you are confusing variables and objects.

a variable is a box that can hold an object

so x = 2 puts the object '2' in the box 'x'.

following that with x = '3' changes the box 'x' to hold the object '3'.

but lists are also boxes, different from variables.

so x = [1,2,3]

puts the a list object, that is a box that contains 1, 2 and 3, in 'x'

then y = x

puts THE SAME list object in box 'y'.

then y[1] = 4 changes the second item in the list's box to 4

the print x gives "[1,4,3]" because you have changed contents of the list.

in contrast x = 3 then y = x then y = 4 does not change x because you care
changing variables, not list contents.

to fix your code, you need to copy the list

x = [1,2,3]
y = list(x) # copy
y[1] = 4
print x
[1,2,3]

surely this is ina faq?  it comes up once a day...

andrew



gyro wrote:
> Hi,
> I was writing a Python script to perform some data analyses and was
> surprised by some behavior I noted. A simple test program illustrating
> the behavior is below.
> I do not understand why the value of 'data' is being modified. I am
> obviously missing something obvious, and would certainly appreciate an
> explanation of why this is happening.
>
> Thank you.
>
> -gf
>
> ----------
>
> #!/bin/env python
>
> class TestPop(object):
>     def round1(self,data1):
>         t = data1.pop(-1)
>
>     def round2(self,data2):
>         t = data2.pop(-1)
>
>     def tester(self):
>         data = range(10)
>         self.round1(data)
>         print data
>         self.round2(data)
>         print data
>
> if __name__ == '__main__':
>     tp = TestPop()
>     tp.tester()
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From nagle at animats.com  Sat Feb 14 11:27:29 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 08:27:29 -0800
Subject: Can Python serial support run at 45.45 baud?
Message-ID: <4996e984$0$1657$742ec2ed@news.sonic.net>

    Can Python's serial port support be made to run at 45.45 baud, the old
"60 speed" Teletype machine speed?  I've restored a Model 15 teletype from
WWII.  Works great after cleaning, oiling, and adjustment.  There's
Perl support for this, and a Perl program ("http://www.buzbee.net/heavymetal")
that runs the things.  I'd like to do something similar in Python, both
on Windows and Linux.

    I'm proposing to use Python 2.6, PyWin32-212, and PySerial 2.4.
The PySerial interface allows requesting a specific baud rate, but does that
propagate properly all the way down into Windows?   And what about
Linux, where the "stty" interface is quite different?

					John Nagle


From nick at craig-wood.com  Sat Feb 14 11:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 14 Feb 2009 10:32:00 -0600
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
Message-ID: <slrngpdpt1.m13.nick@irishsea.home.craig-wood.com>

Sammo <sammo2828 at gmail.com> wrote:
>  String concatenation has been optimized since 2.3, so using += should
>  be fairly fast.
> 
>  In my first test, I tried concatentating a 4096 byte string 1000 times
>  in the following code, and the result was indeed very fast (12.352 ms
>  on my machine).
> 
>  import time
>  t = time.time()
>  mydata = ""
>  moredata = "A"*4096
>  for i in range(1000):
>      mydata += moredata # 12.352 ms
>  print "%0.3f ms"%(1000*(time.time() - t))
> 
>  However, I got a different result in my second test, which is
>  implemented in a class with a feed() method. This test took 4653.522
>  ms on my machine, which is 350x slower than the previous test!
> 
>  class StringConcatTest:
>      def __init__(self):
>          self.mydata = ""
> 
>      def feed(self, moredata):
>          self.mydata += moredata # 4653.522 ms
> 
>  test = StringConcatTest()
>  t = time.time()
>  for i in range(1000):
>      test.feed(moredata)
>  print "%0.3f ms"%(1000*(time.time() - t))
> 
>  Note that I need to do something to mydata INSIDE the loop, so please
>  don't tell me to append moredata to a list and then use "".join after
>  the loop.
> 
>  Why is the second test so much slower?

The optimized += depends on their being no other references to the
string.  Strings are immutable in python.  So append must return a new
string.  However the += operation was optimised to do an in-place
append if and only if there are no other references to the string.

You can see this demonstrated here

$ python -m timeit -s 'a="x"' 'a+="x"'
1000000 loops, best of 3: 0.231 usec per loop

$ python -m timeit -s 'a="x"; b=a' 's = a; a+="x"'
100000 loops, best of 3: 30.1 usec per loop

You are keeping the extra reference in a class instance like this

$ python -m timeit -s 'class A(object): pass' -s 'a=A(); a.a="x"' 'a.a+="x"'
100000 loops, best of 3: 30.7 usec per loop

Knowing that, this optimization suggests itself

$ python -m timeit -s 'class A(object): pass' -s 'a=A(); a.a="x"' 's = a.a; a.a = None; s += "x"; a.a = s'
1000000 loops, best of 3: 0.954 usec per loop

Or in your example

class StringConcatTest:
    def __init__(self):
        self.mydata = ""
    def feed(self, moredata):
        #self.mydata += moredata
        s = self.mydata
        del self.mydata
        s += moredata
        self.mydata = s

moredata = "A"*4096
test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)

print "%0.3f ms"%(1000*(time.time() - t))

Before it was 3748.012 ms on my PC, afterwards it was 52.737 ms

However that isn't a perfect solution - what if something had another
reference on self.mydata?

You really want a non-immutable string for this use.  array.array
is a possibility

$ python -m timeit -s 'import array' -s 'a = array.array("c")' 'a.extend("x")'
100000 loops, best of 3: 2.01 usec per loop

There are many other possibilities though like the mmap module.
-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Sat Feb 14 11:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 14 Feb 2009 10:32:00 -0600
Subject: encrypting lines from file with md5 module doesn't work?
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
Message-ID: <slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>

Canned <user at domain.invalid> wrote:
>  I write a small script that read lines from plain text file and encrypt
>  each lines using md5 module. I have a small word list that contain 2000+
>  words, 1 word/line. Using the code below, I can save the output to
>  another file to use it with john the ripper (http://www.openwall.com).
> 
>  Here is the part that annoys me, john recognize the output as des and
>  not as md5. Using the original wordlist, I tried to crack the list but
>  nothing has come up after waiting for almost 9 hours. Can someone please
>  tell me what did I wrong? Why john don't recognize the output as md5?
>  I'm using python 2.5.1 and I'm python noob and also don't have any
>  knowledge about encryption.
> 
>  import sys, md5
> 
>  f = open(sys.argv[1])
>  obj = md5.new()
> 
>  for line in f:
>          if line[-1:] == '\n':
>                  text = line[:-1]
>          obj.update(text),
>          print text + ':' + obj.hexdigest()
> 
>  f.close()
> 
> 
>  000000:670b14728ad9902aecba32e22fa4f6bd
>  00000000:c47532bbb1e2883c902071591ae1ec9b
>  111111:bf874003f752e86e6d6ba6d6df1f24a2
>  11111111:65a89de3000110bf37bcafdbd33df55a
>  121212:38a8eeb4dfb0f86aefea908365817c15
>  123123:f226a65a908909b83aed92661897d0c9

john cracks password files if I remember rightly.

md5 encoded password files don't look like that, they look like this

guest:$1$3nvOlOaw$vRWaitT8Ne4sMjf9NOrVZ.:13071:0:99999:7:::

(not a real password line!)

You need to work out how to write that format.

>From memory: the "$1" bit means it is an md5 hash, the next
"$3nvOlOaw$" is the salt and the final "$vRWaitT8Ne4sMjf9NOrVZ." is
the md5 hash in some encoded format or other!  Some googling should
reveal the correct algorithm!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From user at domain.invalid  Sat Feb 14 11:32:03 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 17:32:03 +0100
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <mailman.9529.1234620902.3487.python-list@python.org>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
	<mailman.9529.1234620902.3487.python-list@python.org>
Message-ID: <4996f1ff$0$7833$9a622dc7@news.kpnplanet.nl>

MRAB schreef:
> Canned wrote:
>> Hi,
>> I need some help with my script. I hope someone can show me the right
>> direction or at least explain to me what did I wrong?
>>
>> I write a small script that read lines from plain text file and encrypt
>> each lines using md5 module. I have a small word list that contain 2000+
>> words, 1 word/line. Using the code below, I can save the output to
>> another file to use it with john the ripper (http://www.openwall.com).
>>
> [snip]
> MD5 is a type of checksum, not a method of encryption.

I found this from google: http://tinyurl.com/4ow2q4
Using that, I changed my script and it seems that it works well. John
recognize it as md5.

It also raise another question. John can crack my password from
/etc/shadow in less than a second, but if I write it down in a file and
using the code below to encrypt the password, john would took really
long time to crack the password.

I've tried several different password using passwd command and my code
to generate md5 hash, but it seems that john really having trouble with
hashes generated with my code as the hashes generated with passwd being
cracked in a matter of second.
Is there something wrong with the code? Am I missing something?

-----------------code-------------------------
#!/usr/bin/env python

import sys
import md5encrypt  # from http://tinyurl.com/4ow2q4

f = open(sys.argv[1])

for line in f:
        if line[-1:] == '\n':
                text = line[:-1]
        print text + ':' + md5encrypt.md5crypt(text,
md5encrypt.generate_salt(5))

f.close()

---------------password.txt--------------------
000000
00000000
111111
11111111
121212
123123


-------------result.txt-----------------
000000:$1$<rVpM$5cYcnJv6qY3AXKiJXKwh4/
00000000:$1$vg^@W$EqAu1mLK6UXogFgkMuf3i1
111111:$1$TVq;y$87mqQPcKXlnj6Ap.1rFgH0
11111111:$1$.iPHo$dLNmzzv5BXBFTn8FqCmog.
121212:$1$`]iS!$L3uSDmn17PGhZ.k275WZj0
123123:$1$}g5"m$OwzfVzg0CMEhNX271K.yp0


From grante at visi.com  Sat Feb 14 11:33:58 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 10:33:58 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
Message-ID: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:

> Can Python's serial port support be made to run at 45.45 baud,
> the old "60 speed" Teletype machine speed? 

If your hardware and OS supports it, Python can be made to
support it.

> I've restored a Model 15 teletype from WWII.

Fun.  I worked with one of those in school back in the day.

> Works great after cleaning, oiling, and adjustment.  There's
> Perl support for this, and a Perl program
> ("http://www.buzbee.net/heavymetal") that runs the things. I'd
> like to do something similar in Python, both on Windows and
> Linux.

OK, go ahead.

> I'm proposing to use Python 2.6, PyWin32-212, and PySerial
> 2.4. The PySerial interface allows requesting a specific baud
> rate, but does that propagate properly all the way down into
> Windows?

Good question.  Since you're the one with the hardware, you'll
have to tell us.  If it doesn't work, it should be trivial to
fix.  Just tell us what mechanism is used by Perl, and we'll
either fix pyserial or tell you how to do so.

> And what about Linux, where the "stty" interface is quite
> different?

Same answer.

-- 
Grant



From deets at nospam.web.de  Sat Feb 14 11:37:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 14 Feb 2009 17:37:07 +0100
Subject: confusion about variable scope in a class
In-Reply-To: <mailman.9533.1234626830.3487.python-list@python.org>
References: <mailman.9533.1234626830.3487.python-list@python.org>
Message-ID: <6voa9mFku543U1@mid.uni-berlin.de>

gyro schrieb:
> Hi,
> I was writing a Python script to perform some data analyses and was
> surprised by some behavior I noted. A simple test program illustrating
> the behavior is below.
> I do not understand why the value of 'data' is being modified. I am
> obviously missing something obvious, and would certainly appreciate an
> explanation of why this is happening.


Lists are mutables, and python passes around references to objects, not 
copies.

So if you want a copy, you need to create one explicit, either by using e.g.


new_list = list(old_list)

which will create a shollow copy of the list, or by using the 
library-module "copy" that also offers a "deepcopy" function.


Diez


From google at mrabarnett.plus.com  Sat Feb 14 11:56:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 16:56:00 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
Message-ID: <4996F7A0.4060008@mrabarnett.plus.com>

Grant Edwards wrote:
> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> 
>> Can Python's serial port support be made to run at 45.45 baud,
>> the old "60 speed" Teletype machine speed? 
> 
> If your hardware and OS supports it, Python can be made to
> support it.
> 
[snip]
I had a quick look at the Windows API. The struct member for the baud
rate is of type DWORD, ie an integer.



From marduk at letterboxes.org  Sat Feb 14 11:57:17 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sat, 14 Feb 2009 11:57:17 -0500
Subject: Function name limit in Python ?
In-Reply-To: <1234622708.3786.17.camel@localhost.localdomain>
References: <1234622708.3786.17.camel@localhost.localdomain>
Message-ID: <1234630637.7402.0.camel@centar.nbk>

On Sat, 2009-02-14 at 07:45 -0700, Linuxguy123 wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  

You forgot to paste the error.



From user at domain.invalid  Sat Feb 14 11:57:30 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 17:57:30 +0100
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
	<slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>
Message-ID: <4996f7f6$0$7827$9a622dc7@news.kpnplanet.nl>

Nick Craig-Wood schreef:
> Canned <user at domain.invalid> wrote:
>>  I write a small script that read lines from plain text file and encrypt
>>  each lines using md5 module. I have a small word list that contain 2000+
>>  words, 1 word/line. Using the code below, I can save the output to
>>  another file to use it with john the ripper (http://www.openwall.com).
>>
>>  Here is the part that annoys me, john recognize the output as des and
>>  not as md5. Using the original wordlist, I tried to crack the list but
>>  nothing has come up after waiting for almost 9 hours. Can someone please
>>  tell me what did I wrong? Why john don't recognize the output as md5?
>>  I'm using python 2.5.1 and I'm python noob and also don't have any
>>  knowledge about encryption.
>>
>>  import sys, md5
>>
>>  f = open(sys.argv[1])
>>  obj = md5.new()
>>
>>  for line in f:
>>          if line[-1:] == '\n':
>>                  text = line[:-1]
>>          obj.update(text),
>>          print text + ':' + obj.hexdigest()
>>
>>  f.close()
>>
>>
>>  000000:670b14728ad9902aecba32e22fa4f6bd
>>  00000000:c47532bbb1e2883c902071591ae1ec9b
>>  111111:bf874003f752e86e6d6ba6d6df1f24a2
>>  11111111:65a89de3000110bf37bcafdbd33df55a
>>  121212:38a8eeb4dfb0f86aefea908365817c15
>>  123123:f226a65a908909b83aed92661897d0c9
> 
> john cracks password files if I remember rightly.
> 
> md5 encoded password files don't look like that, they look like this
> 
> guest:$1$3nvOlOaw$vRWaitT8Ne4sMjf9NOrVZ.:13071:0:99999:7:::
> 
> (not a real password line!)
> 
> You need to work out how to write that format.
> 
Yes, I'm aware of that format and john only need the first 2 fields to
work with, and the rest, AFAIK is ignored.

So the format from my example should be:
000000:$1$670b14728ad9902aecba32e22fa4f6bd

> From memory: the "$1" bit means it is an md5 hash, the next
> "$3nvOlOaw$" is the salt and the final "$vRWaitT8Ne4sMjf9NOrVZ." is
> the md5 hash in some encoded format or other!  Some googling should
> reveal the correct algorithm!
> 

Googling around, I found a piece of code that could do that.
http://tinyurl.com/4ow2q4. Please read my another post about that. I'm
not python expert and I have a little knowledge about encryption.


From Bryan.Fodness at gmail.com  Sat Feb 14 11:57:46 2009
From: Bryan.Fodness at gmail.com (Bryan.Fodness at gmail.com)
Date: Sat, 14 Feb 2009 08:57:46 -0800 (PST)
Subject: Extract an image from a RTF file
Message-ID: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>

I have a large amount of RTF files where the only thing in them is an
image.  I would like to extract them an save them as a png.
Eventually, I would like to also grab some text that is on the image.
I think PIL has something for this.

Does anyone have any suggestion on how to start this?


From deets at nospam.web.de  Sat Feb 14 12:14:11 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 14 Feb 2009 18:14:11 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <6vocf5Fkv5a9U1@mid.uni-berlin.de>

argo785 at gmail.com schrieb:
> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
> 
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

The answer is easy: if you use C, you can use ctypes to create a wrapper 
- with pure python, no compilation, no platform issues.

Which IMHO makes a strong point for C - if you need OO, it's bolted on 
easily using Python itself, by creating some nice wrapper classes.

Diez


From ronaldoussoren at mac.com  Sat Feb 14 12:16:58 2009
From: ronaldoussoren at mac.com (Ronald Oussoren)
Date: Sat, 14 Feb 2009 18:16:58 +0100
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <49968713.4080705@v.loewis.de>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
	<49968713.4080705@v.loewis.de>
Message-ID: <7B96CE20-80E9-47DF-9C14-A542E47F0017@mac.com>


On 14 Feb, 2009, at 9:55, Martin v. L?wis wrote:

>> Any chance of getting a Mac installer for this one?
>
> Chances are non-zero, yes.


I had hoped to build one last night, but got home way later than I had  
planned. The installer is building as I type this.

Ronald

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From orpap at nus.edu.sg  Sat Feb 14 12:31:10 2009
From: orpap at nus.edu.sg (Ajith Prasad)
Date: Sat, 14 Feb 2009 09:31:10 -0800 (PST)
Subject: Financial Modeling in Python
Message-ID: <a533215d-ab74-4739-b242-a111163b6e5c@x6g2000pre.googlegroups.com>

http://as.wiley.com/WileyCDA/WileyTitle/productCd-0470987847.html now
lists the contents of a new book:

Financial Modeling in Python
Shayne Fletcher, Christopher Gardner
ISBN: 978-0-470-98784-1
Hardcover
280 pages
August 2009
Wiley List Price:  US $130.00



From tjreedy at udel.edu  Sat Feb 14 12:33:53 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 12:33:53 -0500
Subject: Thank you, Tkinter. (easy to use)
In-Reply-To: <c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>	<766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>
	<c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>
Message-ID: <gn6va0$54r$1@ger.gmane.org>

DLitgo wrote:

> Does anyone know of a quick and easy install for
 > PIL + JPEG for Mac OS X (10.5)?

If you don't get an answer, try a thread with the above as the title.
There may be a python-mac list somewhere too.



From tjreedy at udel.edu  Sat Feb 14 12:45:44 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 12:45:44 -0500
Subject: Reading a file
In-Reply-To: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
Message-ID: <gn7007$8c5$1@ger.gmane.org>

zaheer.agadi at gmail.com wrote:
> Hi
> 
> How do i read  a file in Python and search a particular pattern
> like I have a file char.txt  which has
> 
> Mango=sweet
> Sky=blue
> 
> I want to get the strings sweet and blue,How to do this..?

for line in open('char.txt'):
   if line.find('sweet') != -1 or line.find('blue') != -1:
     print(line)

Read the section of the Lib Manual on string methods.



From tjreedy at udel.edu  Sat Feb 14 13:01:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 13:01:57 -0500
Subject: Extract an image from a RTF file
In-Reply-To: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
References: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
Message-ID: <gn70ul$bj2$1@ger.gmane.org>

Bryan.Fodness at gmail.com wrote:
> I have a large amount of RTF files where the only thing in them is an
> image.  I would like to extract them an save them as a png.
> Eventually, I would like to also grab some text that is on the image.
> I think PIL has something for this.
> 
> Does anyone have any suggestion on how to start this?

Wikepedia Rich Text Format has several links, which lead to
http://pyrtf.sourceforge.net/
http://code.google.com/p/pyrtf-ng/
The former says rtf generation, including images.
The latter says rtf generation and parsing, but only claims to be a 
rewrite of the former.



From aahz at pythoncraft.com  Sat Feb 14 13:05:01 2009
From: aahz at pythoncraft.com (Aahz)
Date: 14 Feb 2009 10:05:01 -0800
Subject: How to debug deadlock?
References: <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30@r10g2000prf.googlegroups.com>
Message-ID: <gn714d$9aq$1@panix3.panix.com>

In article <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30 at r10g2000prf.googlegroups.com>,
Victor Lin  <Bornstub at gmail.com> wrote:
>
>I am developing a multi-threading application, I encounter a deadlock.
>I use Visual C++ Express 2008 to trace the program. Once the deadlock
>occurs, I just pause the program and trace. I found that when deadlock
>occurs, there will be two threads called python from my C++ extension.
>All of them use Queue in python code, so I guess the deadlock might
>caused by Queue. But however, once the extension goes into python
>code, I can't see nothing but asm code and binary from the VC++
>debugger. I would like to know are there any way to dump the call
>stack of python code after I paused the program? And how can I know
>what lock are there in threads caused the deadlock?

You are already hosed if you have two threads calling into Python,
because you didn't properly acquire the GIL.  I can't help beyond that;
try using the mailing list
http://mail.python.org/mailman/listinfo/capi-sig
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From google at mrabarnett.plus.com  Sat Feb 14 13:07:20 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:07:20 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970561$0$1642$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
Message-ID: <49970858.3070005@mrabarnett.plus.com>

John Nagle wrote:
> Grant Edwards wrote:
>> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
>>
>>> Can Python's serial port support be made to run at 45.45 baud,
>>> the old "60 speed" Teletype machine speed? 
>>
>> If your hardware and OS supports it, Python can be made to
>> support it.
> 
>    OK, tried to open the port, using Python 2.6, latest PySerial
> and PyWin32:
> 
>     ser = serial.Serial(port, baudrate=baud,
>             bytesize=serial.FIVEBITS,
>             parity=serial.PARITY_NONE,
>             stopbits=serial.STOPBITS_TWO)
> 
> Traceback (most recent call last):
>   File "serialtest.py", line 27, in <module>
>     main()
>   File "serialtest.py", line 24, in main
>     ser = openportbaudot(0,45.45)
>   File "serialtest.py", line 17, in openportbaudot
>     stopbits=serial.STOPBITS_TWO)
>   File "D:\python26\lib\site-packages\serial\serialutil.py", line 171, 
> in __init__
>     self.open()
>   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 63, 
> in open
>     self._reconfigurePort()
>   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 171, 
> in _reconfigurePort
>     raise ValueError("Cannot configure port, some setting was wrong. 
> Original message: %s" % e)
> ValueError: Cannot configure port, some setting was wrong. Original 
> message: (87, 'SetCommState', 'The parameter is incorrect.')
> 
>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
> according
> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
> thing.   That looks like a bug.
> 
>    I tried various values for "baud".  PySerial will accept "45", and 
> even "45.45", although I doubt that it's really calculating the serial 
> port divisor
> values from a floating point value.   (Standard serial port hardware can do
> 45.45 baud, and most PCs with non-USB serial ports will do it quite well.)
> For my application, 45 baud should work, with two stop bits; the
> tolerances aren't that tight.
> 
I don't think it's a Python bug. The MSDN website says this:

(http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx.)

When a DCB structure is used to configure the 8250, the following 
restrictions apply to the values specified for the ByteSize and StopBits 
members:

     * The number of data bits must be 5 to 8 bits.
     * The use of 5 data bits with 2 stop bits is an invalid 
combination, as is 6, 7, or 8 data bits with 1.5 stop bits.



From nagle at animats.com  Sat Feb 14 13:26:22 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 10:26:22 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
Message-ID: <49970561$0$1642$742ec2ed@news.sonic.net>

Grant Edwards wrote:
> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> 
>> Can Python's serial port support be made to run at 45.45 baud,
>> the old "60 speed" Teletype machine speed? 
> 
> If your hardware and OS supports it, Python can be made to
> support it.

    OK, tried to open the port, using Python 2.6, latest PySerial
and PyWin32:

	ser = serial.Serial(port, baudrate=baud,
			bytesize=serial.FIVEBITS,
			parity=serial.PARITY_NONE,
			stopbits=serial.STOPBITS_TWO)

Traceback (most recent call last):
   File "serialtest.py", line 27, in <module>
     main()
   File "serialtest.py", line 24, in main
     ser = openportbaudot(0,45.45)
   File "serialtest.py", line 17, in openportbaudot
     stopbits=serial.STOPBITS_TWO)
   File "D:\python26\lib\site-packages\serial\serialutil.py", line 171, in __init__
     self.open()
   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 63, in open
     self._reconfigurePort()
   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 171, in 
_reconfigurePort
     raise ValueError("Cannot configure port, some setting was wrong. Original 
message: %s" % e)
ValueError: Cannot configure port, some setting was wrong. Original message: 
(87, 'SetCommState', 'The parameter is incorrect.')

    Something doesn't like "serial.FIVEBITS".  That's a valid value, according
to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
"serial.EIGHTBITS",  the code will execute, but of course does the wrong
thing.   That looks like a bug.

    I tried various values for "baud".  PySerial will accept "45", and even 
"45.45", although I doubt that it's really calculating the serial port divisor
values from a floating point value.   (Standard serial port hardware can do
45.45 baud, and most PCs with non-USB serial ports will do it quite well.)
For my application, 45 baud should work, with two stop bits; the
tolerances aren't that tight.

					John Nagle


From google at mrabarnett.plus.com  Sat Feb 14 13:48:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:48:56 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970ce7$0$1665$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <49971218.2000403@mrabarnett.plus.com>

John Nagle wrote:
> John Nagle wrote:
> 
>>    OK, tried to open the port, using Python 2.6, latest PySerial
>> and PyWin32:
>>
>>     ser = serial.Serial(port, baudrate=baud,
>>             bytesize=serial.FIVEBITS,
>>             parity=serial.PARITY_NONE,
>>             stopbits=serial.STOPBITS_TWO)
>>
>> ValueError: Cannot configure port, some setting was wrong. Original 
>> message: (87, 'SetCommState', 'The parameter is incorrect.')
>>
>>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
>> according
>> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
>> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
>> thing.   That looks like a bug.
> 
>    OK, here's what's wrong.  The allowed numbers for stop bits in 
> Windows are
> 
>     ONESTOPBIT    0    1 stop bit.
>     ONE5STOPBITS    1    1.5 stop bits.
>     TWOSTOPBITS    2    2 stop bits.
> 
> The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
> See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.
> 
> Microsoft documentation 
> ("http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx") says:
> 
>     * The use of 5 data bits with 2 stop bits is an invalid combination,
>     as is 6, 7, or 8 data bits with 1.5 stop bits.
> 
> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)
> 
> Linux has a different set of restrictions; Linux offers only 1 or 2 stop
> bits, and won't do arbitrary baud rates via the "termios" data structure,
> although there are other ways to request that.  At the hardware level,
> there's a clock rate, a counter, and a divisor, so arbitrary baud
> rates can be set.
> 
If 5+2 is invalid, could you work around it with 6+1 instead (one of the
data bits masquerading as a stop bit)? Presumably the device on the
other end won't care as long as it gets the bits it expects...


From google at mrabarnett.plus.com  Sat Feb 14 13:53:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:53:12 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970ce7$0$1665$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <49971318.4090208@mrabarnett.plus.com>

John Nagle wrote:
[snip]
> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)
> 
I forgot to add that what Windows allows depends on what the hardware
(the serial chip) allows: the MSDN webpage mentions that the DCB struct
configures the 8250.


From nagle at animats.com  Sat Feb 14 13:59:28 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 10:59:28 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970561$0$1642$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
Message-ID: <49970ce7$0$1665$742ec2ed@news.sonic.net>

John Nagle wrote:

>    OK, tried to open the port, using Python 2.6, latest PySerial
> and PyWin32:
> 
>     ser = serial.Serial(port, baudrate=baud,
>             bytesize=serial.FIVEBITS,
>             parity=serial.PARITY_NONE,
>             stopbits=serial.STOPBITS_TWO)
> 
> ValueError: Cannot configure port, some setting was wrong. Original 
> message: (87, 'SetCommState', 'The parameter is incorrect.')
> 
>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
> according
> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
> thing.   That looks like a bug.

    OK, here's what's wrong.  The allowed numbers for stop bits in Windows are

	ONESTOPBIT	0	1 stop bit.
	ONE5STOPBITS	1	1.5 stop bits.
	TWOSTOPBITS	2	2 stop bits.

The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.

Microsoft documentation 
("http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx") says:

     * The use of 5 data bits with 2 stop bits is an invalid combination,
	as is 6, 7, or 8 data bits with 1.5 stop bits.

So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
Python.  1 stop bit will not physically work on Baudot teletypes; the
main camshaft doesn't come around fast enough.  (Yes, there's an actual
mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
Python level gets a reject at the Win32 level.  (Not sure why Win32
doesn't allow that; extra stop bits just add delay, but don't hurt
anything.  But it's not supported.)

Linux has a different set of restrictions; Linux offers only 1 or 2 stop
bits, and won't do arbitrary baud rates via the "termios" data structure,
although there are other ways to request that.  At the hardware level,
there's a clock rate, a counter, and a divisor, so arbitrary baud
rates can be set.

					John Nagle







From roy at panix.com  Sat Feb 14 14:10:39 2009
From: roy at panix.com (Roy Smith)
Date: Sat, 14 Feb 2009 14:10:39 -0500
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <roy-0D11C8.14103914022009@news.panix.com>

In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
 John Nagle <nagle at animats.com> wrote:

> At the hardware level, there's a clock rate, a counter, and a divisor, 
> so arbitrary baud rates can be set.

Is that really true of modern hardware?  The last time I looked at serial 
port hardware, UARTs took a base clock rate and divided it sequentially 
with flip-flops to get all the possible rates (they usually had some ugly 
logic to generate 110).  You were limited to the specific rates the 
hardware gave you.  Is that no longer the case?


From curt.hash at gmail.com  Sat Feb 14 14:15:49 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Sat, 14 Feb 2009 12:15:49 -0700
Subject: Extract an image from a RTF file
In-Reply-To: <gn70ul$bj2$1@ger.gmane.org>
References: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
	<gn70ul$bj2$1@ger.gmane.org>
Message-ID: <736698790902141115i5c109300xc9193ed33e973c8b@mail.gmail.com>

On Sat, Feb 14, 2009 at 11:01 AM, Terry Reedy <tjreedy at udel.edu> wrote:
>
> Bryan.Fodness at gmail.com wrote:
>>
>> I have a large amount of RTF files where the only thing in them is an
>> image.  I would like to extract them an save them as a png.
>> Eventually, I would like to also grab some text that is on the image.
>> I think PIL has something for this.
>>
>> Does anyone have any suggestion on how to start this?
>
> Wikepedia Rich Text Format has several links, which lead to
> http://pyrtf.sourceforge.net/
> http://code.google.com/p/pyrtf-ng/
> The former says rtf generation, including images.
> The latter says rtf generation and parsing, but only claims to be a rewrite of the former.
>
> --
> http://mail.python.org/mailman/listinfo/python-list

I've written an RTF parser in Python before, but for the purpose of
filtering and discarding content rather than extracting it.

Take a look at the specification here:
http://www.microsoft.com/downloads/details.aspx?familyid=dd422b8d-ff06-4207-b476-6b5396a18a2b&displaylang=en

You will find that images are specified by one or more RTF control
words followed by a long string of hex data. For this special purpose,
you will not need to write a parser for the entire specification. Just
search the file for the correct sequence of control words, extract the
hex data that follows, and save it to a file.

It helps if you open the RTF document in a text editor and locate the
specific control group that contains the image, as the format and
order of control words varies depending on the application that
created it. If all of your documents are created with the same
application, it will be much easier.


From argo785 at gmail.com  Sat Feb 14 14:37:01 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Sat, 14 Feb 2009 11:37:01 -0800 (PST)
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
Message-ID: <5079b2c4-2dae-484b-96b3-78dedd9b071d@z6g2000pre.googlegroups.com>

On Feb 14, 12:14?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> The answer is easy: if you use C, you can use ctypes to create a wrapper
> - with pure python, no compilation, no platform issues.
>
> Which IMHO makes a strong point for C - if you need OO, it's bolted on
> easily using Python itself, by creating some nice wrapper classes.
>

Thanks for the replies, everyone.

After posting I went back and reviewed some of my old C books as well
as the C++ ones. It's interesting and instructive to look back at C++
after you've used languages like Python for a while. I'd forgotten how
complicated C++ code can get.


From hniksic at xemacs.org  Sat Feb 14 14:49:45 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sat, 14 Feb 2009 20:49:45 +0100
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
Message-ID: <87vdrciysm.fsf@mulj.homelinux.net>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> The answer is easy: if you use C, you can use ctypes to create a
> wrapper - with pure python, no compilation, no platform issues.

The last part is not true.  ctypes doesn't work on 64-bit
architectures, nor does it work when Python is built with non-gcc Unix
compilers.


From tripplowe at gmail.com  Sat Feb 14 15:06:14 2009
From: tripplowe at gmail.com (tripp)
Date: Sat, 14 Feb 2009 12:06:14 -0800 (PST)
Subject: Fortran array in python (f2py?)...
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
Message-ID: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>

OK.  It sounds like it would be easiest for me, then, to dump the
arrays to a binary file (much faster than dumping it to a text) from
the fortran program.  Then use f2py to load a fortran module to read
it.?.

How well does python handle binary files?  Maybe I could skit the f2py
all together if I can get python to read the fortran binary file...

-TLowe


From lists at cheimes.de  Sat Feb 14 15:08:45 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 14 Feb 2009 21:08:45 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <87vdrciysm.fsf@mulj.homelinux.net>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
Message-ID: <gn78cd$vko$1@ger.gmane.org>

Hrvoje Niksic schrieb:
> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> The answer is easy: if you use C, you can use ctypes to create a
>> wrapper - with pure python, no compilation, no platform issues.
> 
> The last part is not true.  ctypes doesn't work on 64-bit
> architectures, nor does it work when Python is built with non-gcc Unix
> compilers

ctypes works on 64bit systems, too. However it's a pain in the ... back
to write code with ctypes that works across all platforms. I used to use
ctypes for wrapper but eventually I switched to Cython.

Christian



From kwmsmith at gmail.com  Sat Feb 14 15:34:18 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Sat, 14 Feb 2009 14:34:18 -0600
Subject: Fortran array in python (f2py?)...
In-Reply-To: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
	<d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
Message-ID: <c266a7930902141234wa2090dew63e90cdba333d345@mail.gmail.com>

On Sat, Feb 14, 2009 at 2:06 PM, tripp <tripplowe at gmail.com> wrote:

> OK.  It sounds like it would be easiest for me, then, to dump the
> arrays to a binary file (much faster than dumping it to a text) from
> the fortran program.  Then use f2py to load a fortran module to read
> it.?.


I've done something similar and have written some wrapper functions (in pure
python) that read in fortran binary arrays and puts them into a numpy
array.  You have to deal with fortran records, which (for the fortran
compiler I'm using) puts a 4-byte record length indicator at the beginning
and end of each record, with the raw binary data between.  The issue is
mildly complicated if you have to deal with endianness incompatibilites
between computers.  IIRC, the format of the records is compiler dependent,
although I've found that gfortran, g77 and xlfortran are consistent with
each other.

If you like I'd be happy to send you the code.

Kurt
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From Scott.Daniels at Acm.Org  Sat Feb 14 15:39:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 14 Feb 2009 12:39:33 -0800
Subject: Fortran array in python (f2py?)...
In-Reply-To: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
	<d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
Message-ID: <Q66dncpcAo8dtgrUnZ2dnUVZ_g6WnZ2d@pdx.net>

tripp wrote:
> ... dump the arrays to a binary file (much faster than dumping it to a text) 
 > from the fortran program....
> 
> How well does python handle binary files?  Maybe I could skit the f2py
> all together if I can get python to read the fortran binary file...

Likely your best plan.  Look into the numpy external package, because
those arrays are _far_ superior for actual calculation.  With numpy you
can do array_1 + array_2 without requiring a Python loop.  I'm sure
it has a way to read in binary arrays of the various data types.

--Scott David Daniels
Scott.Daniels at Acm.Org


From zubeido at yahoo.com.br  Sat Feb 14 15:46:25 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sat, 14 Feb 2009 12:46:25 -0800 (PST)
Subject: Rapidshare to Megaupload script
Message-ID: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>


I've made this script and would like to have some input and share it
with the community.
I also have a page with some code i produce on my spare time. http://pneves.net
Thanks

# -*- coding: utf-8 -*-
## I Paulo Neves am the owner of this script and i do not allow the
copy or distribution
## of this script without my permission to commercial purposes
## If you have any suggestions please mail me and i will reply and
post the on the site
from __future__ import with_statement
from urlparse import urljoin
import urllib2, urllib
import os, sys
import re
import ConfigParser


urls = []
acc_details = 0
firs_run = 0


def from_rapidshare(url):
    '''Check if this is a rapidshare link'''
    return (url.startswith("rapidshare.com") or
        url.startswith("www.rapidshare.com") or
        url.startswith("http://rapidshare.com") or
        url.startswith("http://www.rapidshare.com"))


def account_details():
    if os.environ.has_key("APPDATA") and os.path.exists(os.environ
["APPDATA"]):
        path = os.environ["APPDATA"] + "\\murs.cfg"
    else:
        path = os.path.expanduser("~") + "\.murs.cfg"

    if not os.path.exists(path):
        print path
        m_user = raw_input("Enter your user name for megaupload: ")
        m_password = raw_input("Enter your password for megaupload: ")
        r_user = raw_input("Enter your user name for rapidshare: ")
        r_password = raw_input("Enter your password for rapidshare: ")
        cfg = ConfigParser.SafeConfigParser()
        cfg.add_section('Acc_Details')
        cfg.set('Acc_Details', 'm_user ', m_user)
        cfg.set('Acc_Details', 'm_password', m_password)
        cfg.set('Acc_Details', 'r_user', r_user)
        cfg.set('Acc_Details', 'r_password', r_password)
        with open(path, 'wb') as configfile:
            cfg.write(configfile)

    cfg = ConfigParser.SafeConfigParser()
    cfg.read(path)
    try:
        m_user = cfg.get("Acc_Details", "m_user")
        m_password = cfg.get("Acc_Details", "m_password")
        r_user = cfg.get("Acc_Details", "r_user")
        r_password = cfg.get("Acc_Details", "r_password")
    except ConfigParser.NoSectionError or ConfigParser.NoOptionError:
        print "no section or No Option"
        print
        os.remove(path)
    return (m_user, m_password, r_user, r_password)

def cookie_processor(cookie):
    cookie = cookie.split("; ")
##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
(cookie) ) ] )
##    if cookie['user'] != None:
    return cookie
##    else:
##        print "Scheme has changed or authentication failes. Last
option most likely"
##        sys.exit()
##

def rs_auth(login):
    r_user = login[0]
    r_password = login[1]
    opener = urllib2.build_opener(urllib2.HTTPSHandler())
    urllib2.install_opener( opener )
    cred = urllib.urlencode({"login": r_user, "password": r_password})
    try:
        req = urllib2.urlopen("https://ssl.rapidshare.com/cgi-bin/
premiumzone.cgi", cred)
        cookie_rs = cookie_processor( req.headers.get("set-cookie",
"") )
    except  urllib2.URLError:
        print"Some error with the connection ocurred. Try again now or
later"
        sys.exit()
    #Returns the page if flag is set
    return req.read(), cookie_rs


def mu_auth(login):
    r_user = login[0]
    r_password = login[1]
    cred = urllib.urlencode({"login": r_user, "password": r_password})
    try:
        req = urllib2.urlopen("http://www.megaupload.com", cred)
        cookie_mu = cookie_processor( req.headers.get("set-cookie",
"") )

    except:
        print "Connection failed"
        sys.exit()


    #returns the authenticated header, in case future changes
specificaly ask the cookie it would be easy
    #to change code or even extract it from the header itself as a
dictionary key
    return cookie_mu

def set_rscookie_in_musite(cookie_mu, cookie_rs) :
    #it doesnt need to check for the cookie because it automaticaly
resets for the new value
    cookie_rs = cookie_rs.split("=",1)
    header = {"Content-type": "application/x-www-form-urlencoded",
"Accept": "text/plain", "cookie":cookie_mu}
    params = urllib.urlencode({'domain': "http://rapidshare.com",
'cookiename1': cookie_rs[0], 'cookievalue1': cookie[1] })
    req = urllib2.Request("http://www.megaupload.com/multifetch/?
c=cookies", params, header )
    print header
    print params
    #r = urllib2.urlopen(req)
    return True

acc_details = account_details()
if len(sys.argv)==1:
    print "Try -help for more information"
    sys.exit("No arguments")


if sys.argv[1] == "-h" or sys.argv[1] == "?help":
    print " > murs http://megaupload.com/?d=FILE1 ? http://megaupload.com/?d=FILEN"
    print " Download one or several rapidshare links passed as
argument separated by whitespace\n"
    print " >murs links.txt"
    print " Download a list of links from a file\n"
    print " >murs account"
    print " Automaticaly downloads the entire contents of your
account"
    sys.exit()
## Process the arguments
## AFTER THIS ITS ALL ROLLING


if sys.argv[1] == "account" or sys.argv[1] == "-a":
        #Getting the rapidshare user and password respectivelyfrom the
account details already called
        print acc_details[2:]
        page = rs_auth( acc_details[2:] )
        rex = re.findall('''Adliste\["(........|.)"\]\["filename"\] =
"(.*)"''', page[0])
        for retrieved_data in rex:
           #as there are two matches the retrieved_data is still a
list
           urls.append("http://rapidshare.com/files/" + retrieved_data
[0] + "/" + retrieved_data[1])

elif os.path.exists(sys.argv[1]): # If this is a file
    from_file = True
    l_file = sys.argv[1]
    print "Reading list of links from the file " , l_file
    print "\n"
    list_f = file(l_file, "r")
    urls = list_f.readlines()
    list_f.close()
    if not from_rapidshare(urls):
        sys.exit("Urls in text file were not valid")


elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
    for i in range(1, len(sys.argv)):
        if from_rapidshare(sys.argv[i]):
            urls.append(sys.argv[i])
else:
        print "This is not valid argument" , sys.argv[1]
        sys.exit()
urls = []

cookie_mu = mu_auth(acc_details[:2])
print cookie_mu
headers = {"User Agent": "Mozilla/5.0", "Accept": "text/plain",
"cookie":cookie_mu[0]}
for url in urls:
    try:
        params = urllib.urlencode({'srcurl': url, 'description':
"something"})
        req = urllib2.Request("http://megaupload.com/multifetch/",
params, headers )
        r = urllib2.urlopen(req)

    except:
         print "An error ocurred while trying to talk to megaupload.
Make sure you enter the correct password"


From tino at wildenhain.de  Sat Feb 14 15:54:25 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sat, 14 Feb 2009 21:54:25 +0100
Subject: PySerial "write" should accept "bytearray"
In-Reply-To: <49972dbc$0$1648$742ec2ed@news.sonic.net>
References: <49972dbc$0$1648$742ec2ed@news.sonic.net>
Message-ID: <49972F81.8020000@wildenhain.de>

John Nagle wrote:
>   PySerial, which is basically a binary input/output system, is
> still requiring "str" instead of "bytearray", even under Python 2.6.
> For "file-like objects", "write" functions are supposed to accept
> "bytearray" now, and "read" functions should return a "bytearray".
> 
I'm sure patches are welcome. And did you copy the pyserial author?

Regards
Tino
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From rt8396 at gmail.com  Sat Feb 14 16:10:31 2009
From: rt8396 at gmail.com (r)
Date: Sat, 14 Feb 2009 13:10:31 -0800 (PST)
Subject: ANN: SuPy - Script Sketchup with Python
References: <6v1u4pFho98dU1@mid.individual.net>
	<498C64E2.1050204@islandtraining.com> 
	<mailman.9001.1233949708.3487.python-list@python.org>
Message-ID: <b2564ff2-6365-40df-bb75-40bbadc9aaea@o2g2000prl.googlegroups.com>

Great work Greg, you are a Python zen master!


From nagle at animats.com  Sat Feb 14 16:16:14 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:16:14 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <mailman.9543.1234637591.3487.python-list@python.org>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
Message-ID: <49972cf5$0$1612$742ec2ed@news.sonic.net>

MRAB wrote:
> John Nagle wrote:
> [snip]
>> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
>> Python.  1 stop bit will not physically work on Baudot teletypes; the
>> main camshaft doesn't come around fast enough.  (Yes, there's an actual
>> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
>> Python level gets a reject at the Win32 level.  (Not sure why Win32
>> doesn't allow that; extra stop bits just add delay, but don't hurt
>> anything.  But it's not supported.)

    I patched PySerial to support "STOPBITS_ONE5", for 1.5 stop bits,
and the big Teletype Model 15 is now banging out text from Python.

    I actually put in "45.45" as the baud rate; it gets rounded down
to 45 for Windows, which works.  That won't work on Linux, though;
there's a canned list of speeds for POSIX serial ports.  (It's the
same list PDP-11 serial ports had in the 1970s, plus some later
extensions at the high end.)

    1.5 or 2 stop bits is acceptable for the old heavy iron, but 1.5
is preferred, because there's less vibration and wear.  With 2 stop bits,
the Teletype Model 15 clutch drops out on every character and the drive
train momentarily comes to a halt.   With 1.5, everything rotates steadily.

					John Nagle


From nagle at animats.com  Sat Feb 14 16:19:34 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:19:34 -0800
Subject: PySerial "write" should accept "bytearray"
Message-ID: <49972dbc$0$1648$742ec2ed@news.sonic.net>

   PySerial, which is basically a binary input/output system, is
still requiring "str" instead of "bytearray", even under Python 2.6.
For "file-like objects", "write" functions are supposed to accept
"bytearray" now, and "read" functions should return a "bytearray".

				John Nagle


From nagle at animats.com  Sat Feb 14 16:25:37 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:25:37 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <roy-0D11C8.14103914022009@news.panix.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
Message-ID: <49972f28$0$1622$742ec2ed@news.sonic.net>

Roy Smith wrote:
> In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
>  John Nagle <nagle at animats.com> wrote:
> 
>> At the hardware level, there's a clock rate, a counter, and a divisor, 
>> so arbitrary baud rates can be set.
> 
> Is that really true of modern hardware?  The last time I looked at serial 
> port hardware, UARTs took a base clock rate and divided it sequentially 
> with flip-flops to get all the possible rates (they usually had some ugly 
> logic to generate 110).  You were limited to the specific rates the 
> hardware gave you.  Is that no longer the case?

    It is, but the traditional serial clock rate is 115200 Hz, so you can use
any subdivision of that as a baud rate.  The divisor for 45.45 baud is
something like 2535.

    Some exotic serial port devices use a 16MHz clock; I've used those for
supporting SICK LMS laser rangerfinders at 500,000 baud.

					John Nagle


From thorsten at thorstenkampe.de  Sat Feb 14 16:35:12 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 14 Feb 2009 22:35:12 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
Message-ID: <MPG.2401577a930c03df9897c2@news.individual.de>

* Rhodri James (Fri, 13 Feb 2009 22:57:42 -0000)
> 
> On Fri, 13 Feb 2009 11:13:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
> wrote:
> 
> > OK, enough tinkering with the code and others matters on my end trying  
> > to find a work around. Somehow after much successful use of IDLE's  
> > execution facility, I've stepped on an invisible banana peel. I think  
> > it's evident that I'm not going around this problem easily with the IDLE  
> > execution attempts, and that another solution is required.
> 
> Congratulations, we've only been telling you this for the last few days.
> I wonder, is there any chance that you've noticed the solution given?

The Lord gives and the Lord takes. Sometimes it just takes a bit 
longer...

Thorsten


From thorsten at thorstenkampe.de  Sat Feb 14 16:37:52 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 14 Feb 2009 22:37:52 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
	<mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>
Message-ID: <MPG.2401581adea875e9897c3@news.individual.de>

* W. eWatson (Fri, 13 Feb 2009 20:58:33 -0800)
> Scott David Daniels wrote:
> > OK, you are using the oldest and least useful revision control
> > system, "rename and remember." I'd suggest you get and use bazaar,
> > but you'll just ask for shortcuts on how to use it without
> > understanding what it does.
> It works for me, and, frankly, I'm not interested in going to Linux,
> SunOS or other "revision systmes". These are way in my distant past,
> and the only reason I'm currently, and begrudgingly, once again
> writing programs is that the Python software program I am using is
> limited in its ability.

You, sir, certainly made my day. Thank you!

Thorsten


From google at mrabarnett.plus.com  Sat Feb 14 17:17:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 22:17:09 +0000
Subject: Rapidshare to Megaupload script
In-Reply-To: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
Message-ID: <499742E5.9040000@mrabarnett.plus.com>

aiwarrior wrote:
> I've made this script and would like to have some input and share it
> with the community.
> I also have a page with some code i produce on my spare time. http://pneves.net
> Thanks
> 
[snip]
> 
> def from_rapidshare(url):
>     '''Check if this is a rapidshare link'''
>     return (url.startswith("rapidshare.com") or
>         url.startswith("www.rapidshare.com") or
>         url.startswith("http://rapidshare.com") or
>         url.startswith("http://www.rapidshare.com"))
> 
You can shorten:

     s.startswith(x) or s.startswith(y) or ...

to:

     s.startswith((x, y, ...))

[snip]
>     cfg = ConfigParser.SafeConfigParser()
>     cfg.read(path)
>     try:
>         m_user = cfg.get("Acc_Details", "m_user")
>         m_password = cfg.get("Acc_Details", "m_password")
>         r_user = cfg.get("Acc_Details", "r_user")
>         r_password = cfg.get("Acc_Details", "r_password")
>     except ConfigParser.NoSectionError or ConfigParser.NoOptionError:

In order to catch multiple exceptions it should be:

     except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):

>         print "no section or No Option"
>         print
>         os.remove(path)
>     return (m_user, m_password, r_user, r_password)
> 
> def cookie_processor(cookie):
>     cookie = cookie.split("; ")
> ##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
> (cookie) ) ] )
Or:
##    cookie = dict(x.split("=") for x in cookie)

> ##    if cookie['user'] != None:
When checking for None use "is" and "is not":
##    if cookie['user'] is not None:

>     return cookie
> ##    else:
> ##        print "Scheme has changed or authentication failes. Last
> option most likely"
> ##        sys.exit()
Raising an exception is better than exiting.

> ##
> 
[snip]
> def mu_auth(login):
>     r_user = login[0]
>     r_password = login[1]
>     cred = urllib.urlencode({"login": r_user, "password": r_password})
>     try:
>         req = urllib2.urlopen("http://www.megaupload.com", cred)
>         cookie_mu = cookie_processor( req.headers.get("set-cookie",
> "") )
> 
>     except:
Don't use an empty "except"; be explicit in which exception you want to 
catch .

[snip]
> 
> if sys.argv[1] == "-h" or sys.argv[1] == "?help":
Or:

     if sys.argv[1] in ("-h", "?help"):

[snip]

> elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
>     for i in range(1, len(sys.argv)):
Or:

     for arg in sys.argv[1 : ]:

and so on.

>         if from_rapidshare(sys.argv[i]):
>             urls.append(sys.argv[i])
> else:
>         print "This is not valid argument" , sys.argv[1]
>         sys.exit()
> urls = []
> 
[snip]
HTH


From nytrokiss at gmail.com  Sat Feb 14 17:27:47 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 15 Feb 2009 00:27:47 +0200
Subject: Rapidshare to Megaupload script
In-Reply-To: <499742E5.9040000@mrabarnett.plus.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<499742E5.9040000@mrabarnett.plus.com>
Message-ID: <8a6b8e350902141427y630b8daet537009181516e7f2@mail.gmail.com>

This can be used as a great guide on writing pythonic code. Don't look at
the specific code that is being corrected but look at how the improvements
are being presented.

I would recommend someone who is learning python read this guide.

On Sun, Feb 15, 2009 at 12:17 AM, MRAB <google at mrabarnett.plus.com> wrote:

> aiwarrior wrote:
>
>> I've made this script and would like to have some input and share it
>> with the community.
>> I also have a page with some code i produce on my spare time.
>> http://pneves.net
>> Thanks
>>
>>  [snip]
>
>>
>> def from_rapidshare(url):
>>    '''Check if this is a rapidshare link'''
>>    return (url.startswith("rapidshare.com") or
>>        url.startswith("www.rapidshare.com") or
>>        url.startswith("http://rapidshare.com") or
>>        url.startswith("http://www.rapidshare.com"))
>>
>>  You can shorten:
>
>    s.startswith(x) or s.startswith(y) or ...
>
> to:
>
>    s.startswith((x, y, ...))
>
> [snip]
>
>>    cfg = ConfigParser.SafeConfigParser()
>>    cfg.read(path)
>>    try:
>>        m_user = cfg.get("Acc_Details", "m_user")
>>        m_password = cfg.get("Acc_Details", "m_password")
>>        r_user = cfg.get("Acc_Details", "r_user")
>>        r_password = cfg.get("Acc_Details", "r_password")
>>    except ConfigParser.NoSectionError or ConfigParser.NoOptionError:
>>
>
> In order to catch multiple exceptions it should be:
>
>    except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
>
>         print "no section or No Option"
>>        print
>>        os.remove(path)
>>    return (m_user, m_password, r_user, r_password)
>>
>> def cookie_processor(cookie):
>>    cookie = cookie.split("; ")
>> ##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
>> (cookie) ) ] )
>>
> Or:
> ##    cookie = dict(x.split("=") for x in cookie)
>
>  ##    if cookie['user'] != None:
>>
> When checking for None use "is" and "is not":
> ##    if cookie['user'] is not None:
>
>     return cookie
>> ##    else:
>> ##        print "Scheme has changed or authentication failes. Last
>> option most likely"
>> ##        sys.exit()
>>
> Raising an exception is better than exiting.
>
>  ##
>>
>>  [snip]
>
>> def mu_auth(login):
>>    r_user = login[0]
>>    r_password = login[1]
>>    cred = urllib.urlencode({"login": r_user, "password": r_password})
>>    try:
>>        req = urllib2.urlopen("http://www.megaupload.com", cred)
>>        cookie_mu = cookie_processor( req.headers.get("set-cookie",
>> "") )
>>
>>    except:
>>
> Don't use an empty "except"; be explicit in which exception you want to
> catch .
>
> [snip]
>
>>
>> if sys.argv[1] == "-h" or sys.argv[1] == "?help":
>>
> Or:
>
>    if sys.argv[1] in ("-h", "?help"):
>
> [snip]
>
>  elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
>>    for i in range(1, len(sys.argv)):
>>
> Or:
>
>    for arg in sys.argv[1 : ]:
>
> and so on.
>
>         if from_rapidshare(sys.argv[i]):
>>            urls.append(sys.argv[i])
>> else:
>>        print "This is not valid argument" , sys.argv[1]
>>        sys.exit()
>> urls = []
>>
>>  [snip]
> HTH
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From pDOTpagel at wzw.tum.de  Sat Feb 14 17:31:29 2009
From: pDOTpagel at wzw.tum.de (Philipp Pagel)
Date: Sat, 14 Feb 2009 22:31:29 +0000 (UTC)
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
Message-ID: <gn7go0$jql$1@news.lrz-muenchen.de>

zaheer.agadi at gmail.com wrote:
> Hi

> How do i read  a file in Python and search a particular pattern
> like I have a file char.txt  which has

> Mango=sweet
> Sky=blue

> I want to get the strings sweet and blue,How to do this..?

If your entire file consists of such key=value pairs you may want to properly parse them:

for lne in infile:
	line = line.rstrip()
	key, value = line.split('=')
	if key in ('Mango', 'Sky'):
		print value

Or something like that - details depend on what exactly your criteria for
picking the values are, of course.

cu
	Philipp

-- 
Dr. Philipp Pagel
Lehrstuhl f. Genomorientierte Bioinformatik
Technische Universit?t M?nchen
http://mips.gsf.de/staff/pagel


From greg.ewing at canterbury.ac.nz  Sat Feb 14 18:29:40 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sun, 15 Feb 2009 12:29:40 +1300
Subject: ANN: SuPy 1.3
Message-ID: <mailman.9558.1234695122.3487.python-announce-list@python.org>

SuPy 1.3 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Added the rest of the promised functionality to the menus module
   (submenus and separators) and provided an example of its usage
   in examples.py.

- The scheme for preserving variables using a __keep__ attribute
   turned out to be fatally flawed. It has been replaced by a new
   mechanism using a keep() function instead. See the section on
   "Preserving Data" for details.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From rhodri at wildebst.demon.co.uk  Sat Feb 14 19:09:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 15 Feb 2009 00:09:42 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
	<Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>
Message-ID: <op.upc9egb5a8ncjz@gnudebst>

On Sat, 14 Feb 2009 05:03:13 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> See my response to Scott. Thanks for your reply.

I did.  It was fundamentally mistaken in so many respects that
I formally give up on you.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sou1980 at tellas.gr  Sat Feb 14 19:42:52 2009
From: sou1980 at tellas.gr (Tsolakos Stavros)
Date: Sun, 15 Feb 2009 02:42:52 +0200
Subject: GetKeyboardLayoutName Win32API
Message-ID: <gn7oei$1hmu$1@adenine.netfront.net>

Hi all.

I was trying to find a way to read the currently selected input layout
from an app written in python. I am aware that if the app were written
in C, I would have to call the GetKeyboardLayoutName() function. How can
this be done in Python? I want to avoid writing an extension just for
this. The function is not available through pywin32.

Thank you,
Stavros


From konteyaj at gmail.com  Sat Feb 14 22:30:40 2009
From: konteyaj at gmail.com (konteya joshi)
Date: Sat, 14 Feb 2009 19:30:40 -0800
Subject: ImportError: dynamic module does not define init function (inittypes)
Message-ID: <e9613a380902141930q381e91b5i98fad9326cfd3206@mail.gmail.com>

Hi,

Iam trying to run a programs which resides insides ..\pythonroot.

I see the following error on running the program:

'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "skyline\alpine_kickoff.py", line 6, in ?
    import re
  File "C:\Perforce\qa\testware\build\vmqa\python\python-2.4.1-as\lib\re.py",
line 5, in ?
    from sre import *
  File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\sre.py",
line 265, in ?
    import copy_reg
  File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\copy_reg.py",
line 7, in ?
    from types import ClassType as _ClassType
ImportError: dynamic module does not define init function (inittypes)

Any body who would have an idea on what might be going wrong?

I have python-2.4.1-as directory in my PYTHONPATH which contains the
Lib,libs...etc in the directory. The Lib contains the re,sre,copy_reg
inside the directory.

Thanks.


From steve at pearwood.info  Sat Feb 14 22:34:04 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 14:34:04 +1100
Subject: Function name limit in Python ?
References: <mailman.9531.1234622714.3487.python-list@python.org>
Message-ID: <01a782d5$0$14422$c3e8da3@news.astraweb.com>

Linuxguy123 wrote:

> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  

No no, don't tell us what error you got! I love guessing games. I'm guessing
you got either a SyntaxError or a NameError.


> I renamed the same function to getSCVersion() and it called 
> fine.

>>> def python_allows_really_long_function_names_with_no_problem():
...     print "hello world"
... 
>>> python_allows_really_long_function_names_with_no_problem()
hello world
>>>
>>> ptyhon_allows_really_long_function_names_with_no_problem()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'ptyhon_allows_really_long_function_names_with_no_problem'
is not defined

Can you spot the difference? More importantly, can you see how the error
message actually tells you what the error is?


-- 
Steven



From steve at pearwood.info  Sat Feb 14 22:44:45 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 14:44:45 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<slrngpdpt1.m13.nick@irishsea.home.craig-wood.com>
Message-ID: <01a78556$0$20669$c3e8da3@news.astraweb.com>

Nick Craig-Wood wrote:

> The optimized += depends on their being no other references to the
> string. ?Strings are immutable in python. ?So append must return a new
> string. ?However the += operation was optimised to do an in-place
> append if and only if there are no other references to the string.
> 
> You can see this demonstrated here
> 
> $ python -m timeit -s 'a="x"' 'a+="x"'
> 1000000 loops, best of 3: 0.231 usec per loop
> 
> $ python -m timeit -s 'a="x"; b=a' 's = a; a+="x"'
> 100000 loops, best of 3: 30.1 usec per loop

That is a fantastic explanation of why you shouldn't rely on the concat
optimization, although the assignment b=a in the setup isn't necessary and
is a little misleading. Thank you.


-- 
Steven



From grante at visi.com  Sun Feb 15 00:03:03 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:03:03 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <BcudnfxrPcOaPwrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> John Nagle wrote:
>
>>    OK, tried to open the port, using Python 2.6, latest PySerial
>> and PyWin32:
>> 
>>     ser = serial.Serial(port, baudrate=baud,
>>             bytesize=serial.FIVEBITS,
>>             parity=serial.PARITY_NONE,
>>             stopbits=serial.STOPBITS_TWO)
>> 
>> ValueError: Cannot configure port, some setting was wrong. Original 
>> message: (87, 'SetCommState', 'The parameter is incorrect.')
>> 
>>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
>> according
>> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
>> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
>> thing.   That looks like a bug.
>
>     OK, here's what's wrong.  The allowed numbers for stop bits in Windows are
>
> 	ONESTOPBIT	0	1 stop bit.
> 	ONE5STOPBITS	1	1.5 stop bits.
> 	TWOSTOPBITS	2	2 stop bits.
>
> The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
> See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.

That should be simple enough to fix.

> Linux has a different set of restrictions; Linux offers only 1 or 2 stop
> bits, and won't do arbitrary baud rates via the "termios" data structure,
> although there are other ways to request that.

It can be done via the ioctl that setserial uses, but that's
specific to a very few low-level drivers like the 16x50 one --
which is probably the one that matters to the OP, though he
hasn't said so.

-- 
Grant



From grante at visi.com  Sun Feb 15 00:23:16 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:23:16 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
	<49972f28$0$1622$742ec2ed@news.sonic.net>
Message-ID: <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> Roy Smith wrote:
>> In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
>>  John Nagle <nagle at animats.com> wrote:
>> 
>>> At the hardware level, there's a clock rate, a counter, and a
>>> divisor, so arbitrary baud rates can be set.
>> 
>> Is that really true of modern hardware?  The last time I
>> looked at serial port hardware, UARTs took a base clock rate
>> and divided it sequentially with flip-flops to get all the
>> possible rates (they usually had some ugly logic to generate
>> 110).  You were limited to the specific rates the hardware
>> gave you.  Is that no longer the case?
>
> It is, but the traditional serial clock rate is 115200 Hz, so
> you can use any subdivision of that as a baud rate.  The
> divisor for 45.45 baud is something like 2535.

On Linux IFF you're using a 16x50 UART, you can set arbitrary
divisors using the setserial utility.  From Python, you can
just invoke setserial (via os.system() or subprocess). It
should be pretty trivial: execute setserial with the parameters
"/dev/whatever spd_cust divisor 2535".  Then use the normal
calls to set the baud rate to 38400, and you should get 45.444
baud.  [Disclaimer: I haven't tested the above, and I may be
remembering it incorrectly.]

If that's too easy and you want to get your hands dirty, you
can look up the ioctl and parameter structure used by setserial
and invoke the ioctl directly from Python.

Neither method is portable to any other OS (or any other serial
driver, AFAIK).

> Some exotic serial port devices use a 16MHz clock; I've used
> those for supporting SICK LMS laser rangerfinders at 500,000
> baud.

:) 

Been there, done that -- along with that goofy checksum they
call a CRC.  They actually only do the CRC on one bit out of
every byte, and then they just xor in the rest of the byte.
It's very strange, rather slow, and not very good at detecting
errors.  A real, table-driven CRC would be both a lot faster
and a lot more robust.  My guess is that it was _supposed_ to
be a CRC routine, but somebody botched it.  They used the same
botched routine on the host end when they did testing, so
nobody noticed it was broken.  By the time anybody realized
that the CRC routine was broken, masked ROMs were in the field
and it was too late to fix it -- so they just documented the
"custom" algorithm in the manual and called it good.

-- 
Grant



From grante at visi.com  Sun Feb 15 00:25:12 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:25:12 -0600
Subject: PySerial "write" should accept "bytearray"
References: <49972dbc$0$1648$742ec2ed@news.sonic.net>
Message-ID: <VJWdnZHZQsWlOgrUnZ2dnUVZ_rDinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:

> PySerial, which is basically a binary input/output system, is
> still requiring "str" instead of "bytearray", even under Python 2.6.
> For "file-like objects", "write" functions are supposed to accept
> "bytearray" now, and "read" functions should return a "bytearray".

I'm sure a patch would be happily accepted.  I don't use 2.6
yet, and I don't know if the other people who've worked on
pyserial do either.

-- 
Grant



From steve at pearwood.info  Sun Feb 15 00:27:53 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 16:27:53 +1100
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
	<gn7go0$jql$1@news.lrz-muenchen.de>
Message-ID: <01a79d80$0$20652$c3e8da3@news.astraweb.com>

Philipp Pagel wrote:

> zaheer.agadi at gmail.com wrote:
>> Hi
> 
>> How do i read  a file in Python and search a particular pattern
>> like I have a file char.txt  which has
> 
>> Mango=sweet
>> Sky=blue
> 
>> I want to get the strings sweet and blue,How to do this..?
> 
> If your entire file consists of such key=value pairs you may want to
> properly parse them:

The proper way to parse them would be with the ConfigParser module.

The only negative with ConfigParser is that it requires a section label. In
my experience it is quite common for INI files with only a single section
to leave out the label.


-- 
Steven



From steve at pearwood.info  Sun Feb 15 00:31:37 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 16:31:37 +1100
Subject: doctest fails to see tests in decorated functions
References: <01a66625$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <01a79e61$0$20647$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:

> I've just spotted a bug in doctest that it fails to see tests inside
> decorated functions. It's been reported before:
> 
> http://bugs.python.org/issue1108
> 
> but the patch submitted doesn't work for me.

Never mind, it was a PEBCAK error. I failed to notice that applying a
decorator to a function shadows the functions docstring.

Normally I would use functools.wraps, but I am currently limping along on a
Python 2.4 installation here, which doesn't have it.


-- 
Steven



From michele.simionato at gmail.com  Sun Feb 15 00:35:49 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 14 Feb 2009 21:35:49 -0800 (PST)
Subject: doctest fails to see tests in decorated functions
References: <01a66625$0$21875$c3e8da3@news.astraweb.com>
	<01a79e61$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <503ff63e-527a-4bed-a931-722b73d63989@i38g2000yqd.googlegroups.com>

On Feb 15, 6:31?am, Steven D'Aprano <st... at pearwood.info> wrote:
> Never mind, it was a PEBCAK error. I failed to notice that applying a
> decorator to a function shadows the functions docstring.
>
> Normally I would use functools.wraps, but I am currently limping along on a
> Python 2.4 installation here, which doesn't have it.

You may consider this: http://pypi.python.org/pypi/decorator

             M.S.


From lie.1296 at gmail.com  Sun Feb 15 00:56:17 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 15 Feb 2009 05:56:17 +0000 (UTC)
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
Message-ID: <gn8aq0$8rc$1@ger.gmane.org>

On Sat, 14 Feb 2009 22:10:41 -0800, John Nagle wrote:

>  >>> xx = b'x'

Isn't this creating a regular byte?

Shouldn't creation of bytearray be:

>>> xx = bytearray(b'x')




From max at alcyone.com  Sun Feb 15 00:58:54 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sat, 14 Feb 2009 21:58:54 -0800
Subject: "Byte" type?
In-Reply-To: <4997aa38$0$1678$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
Message-ID: <go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>

John Nagle wrote:
>     With "bytearray", the element type is considered to be "unsigned byte",
> or so says PEP 3137: "The element data type is always 'B' (i.e. unsigned 
> byte)."
> 
> Let's try:
> 
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit 
> (Intel)] on
> win32
>  >>> xx = b'x'
>  >>> repr(xx)
> "'x'"
>  >>> repr(xx[0])
> "'x'"
>  >>> repr(xx[0][0])
> "'x'"
>  >>>
> 
> But that's not what "repr" indicates.  The bytearray element is apparently
> being promoted to "bytes" as soon as it comes out of the array.

There's no distinction byte type.  A single character of a bytes type is 
also a bytes.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
   Did you ever love somebody / Did you ever really care
    -- Cassandra Wilson


From clp2 at rebertia.com  Sun Feb 15 01:06:42 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 14 Feb 2009 22:06:42 -0800
Subject: "Byte" type?
In-Reply-To: <gn8aq0$8rc$1@ger.gmane.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<gn8aq0$8rc$1@ger.gmane.org>
Message-ID: <50697b2c0902142206o6878b65ek7887eb4ce271b490@mail.gmail.com>

On Sat, Feb 14, 2009 at 9:56 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
> On Sat, 14 Feb 2009 22:10:41 -0800, John Nagle wrote:
>
>>  >>> xx = b'x'
>
> Isn't this creating a regular byte?
>
> Shouldn't creation of bytearray be:
>
>>>> xx = bytearray(b'x')

Indeed, and slicing that does give back a single byte (which Python
represents as an integer):

>>> b = bytearray(b'abc')
>>> b[0]
97

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From nagle at animats.com  Sun Feb 15 01:10:41 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 22:10:41 -0800
Subject: "Byte" type?
Message-ID: <4997aa38$0$1678$742ec2ed@news.sonic.net>

     With "bytearray", the element type is considered to be "unsigned byte",
or so says PEP 3137: "The element data type is always 'B' (i.e. unsigned byte)."

Let's try:

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on
win32
 >>> xx = b'x'
 >>> repr(xx)
"'x'"
 >>> repr(xx[0])
"'x'"
 >>> repr(xx[0][0])
"'x'"
 >>>

But that's not what "repr" indicates.  The bytearray element is apparently
being promoted to "bytes" as soon as it comes out of the array.

					John Nagle


From nihil.is at free.fr  Sun Feb 15 01:17:08 2009
From: nihil.is at free.fr (Sylvain Rabot)
Date: Sat, 14 Feb 2009 22:17:08 -0800
Subject: Setuptools & Python 3.0
Message-ID: <4997b3ae$0$20705$426a74cc@news.free.fr>

Hi,

I would like to know if the official maintainers of setuptools are working 
on a release for Python 3.0.

Regards. 



From steve at pearwood.info  Sun Feb 15 01:29:42 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 17:29:42 +1100
Subject: How to peek inside a decorated function
Message-ID: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>

Suppose I have a function f() which I know has been decorated, but I don't
have access to the original undecorated function any longer:

def reverse(func):
    def f(*args):
        args = list(args)
        args.reverse()
        return func(*args)
    return f

def say(*args):
    print args

rsay = reverse(say)
del say


Is there any way to peek inside the decorated function rsay() to get access
to the undecorated function say()?

If I look at the code object I can see a reference to the original:

>>> rsay.func_code.co_names
('list', 'args', 'reverse', 'func')

and if I disassemble the code object I can see it being dereferenced:

>>> dis.dis(rsay.func_code)
[snip for brevity]
  5          22 LOAD_DEREF               0 (func)
             25 LOAD_FAST                0 (args)
             28 CALL_FUNCTION_VAR        0
             31 RETURN_VALUE        

but if I look at the closure object, nothing seems useful:

>>> dir(rsay.func_closure[0])
['__class__', '__cmp__', '__delattr__', '__doc__', 
'__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__str__']


and I can't find any other attributes which refers back to the undecorated
original function.


-- 
Steven



From kentandkat at sbcglobal.net  Sun Feb 15 02:14:13 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Sun, 15 Feb 2009 01:14:13 -0600
Subject: python in emacs
Message-ID: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

When I visit a file with extension .py, emacs says "loading
python...done", and gives me a "python" menu with options like "start
interpreter" and "eval buffer". When I try to use one of these options
emacs says "loading compile...done", then hangs and has to be shut down
from the task manager. The Python folder is in my PATH variable and
works fine from the command line (or with IDLE). I'm using emacs-22.3 on
windows xp, and have the same problem with both python-2.2 and
python-3.0. Anybody got any tips, or should I just give up and use some
other editor?

Thanks,
Kent.


From srikrishnamohan at gmail.com  Sun Feb 15 02:38:31 2009
From: srikrishnamohan at gmail.com (km)
Date: Sun, 15 Feb 2009 16:38:31 +0900
Subject: multiprocessing python2.6.1
Message-ID: <f4cc03640902142338u32d04720hb45c61a8bd984cf4@mail.gmail.com>

Dear all,


I have a problem with multiprocessing module usage with python2.6.1
Here Pool object is to be instantiated with 50 processes  and the method
'run' has to be called with pool object.
My actual requirement is to reuse the 50 processes for further processing
until 100 items.

#########################
import multiprocessing as mp

def add(a,b):
    return a+b


if __name__ == '__main__':
    p = mp.Pool(processes=50)
    y = 40
    for x in  range(100):
        p.apply_async(run, (x, y) )
##########################
The problem now is that it creates only 32 processes (and not more) and
exits with processing first 32 numbers  from range(100) .
Is there a cap on the number of subprocesses one can fork ?
Even then,  once these 32 processes r free, I would like to reuse them with
next 32 inputs (x) from  range(100 ) in that order.
how could i accomplish this ?

thanks in advance.
KM
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From tjreedy at udel.edu  Sun Feb 15 03:43:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 03:43:57 -0500
Subject: How to peek inside a decorated function
In-Reply-To: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn8kkc$q3l$1@ger.gmane.org>

Steven D'Aprano wrote:
> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get access
> to the undecorated function say()?
> 
> If I look at the code object I can see a reference to the original:
> 
>>>> rsay.func_code.co_names
> ('list', 'args', 'reverse', 'func')
> 
> and if I disassemble the code object I can see it being dereferenced:
> 
>>>> dis.dis(rsay.func_code)
> [snip for brevity]
>   5          22 LOAD_DEREF               0 (func)
>              25 LOAD_FAST                0 (args)
>              28 CALL_FUNCTION_VAR        0
>              31 RETURN_VALUE        
> 
> but if I look at the closure object, nothing seems useful:
> 
>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__', 
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']
> 
> 
> and I can't find any other attributes which refers back to the undecorated
> original function.

In 3.0, rsay.__closure__[0].cell_contents would be the original function 
object.



From zaheer.agadi at gmail.com  Sun Feb 15 03:55:52 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 15 Feb 2009 00:55:52 -0800 (PST)
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
	<gn7go0$jql$1@news.lrz-muenchen.de>
	<01a79d80$0$20652$c3e8da3@news.astraweb.com>
Message-ID: <093cb726-76e5-421d-8ed3-9547bcd0f3e6@a39g2000prl.googlegroups.com>

On Feb 15, 10:27?am, Steven D'Aprano <st... at pearwood.info> wrote:
> Philipp Pagel wrote:
> > zaheer.ag... at gmail.com wrote:
> >> Hi
>
> >> How do i read ?a file in Python and search a particular pattern
> >> like I have a file char.txt ?which has
>
> >> Mango=sweet
> >> Sky=blue
>
> >> I want to get the strings sweet and blue,How to do this..?
>
> > If your entire file consists of such key=value pairs you may want to
> > properly parse them:
>
> The proper way to parse them would be with the ConfigParser module.
>
> The only negative with ConfigParser is that it requires a section label. In
> my experience it is quite common for INI files with only a single section
> to leave out the label.
>
> --
> Steven

Thanks to all of you,I used to ConfigParser worked fine.

-Zaheer


From __peter__ at web.de  Sun Feb 15 04:05:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 15 Feb 2009 10:05:32 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn8lsr$nea$01$1@news.t-online.com>

Steven D'Aprano wrote:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get
> access to the undecorated function say()?
> 
> If I look at the code object I can see a reference to the original:
> 
>>>> rsay.func_code.co_names
> ('list', 'args', 'reverse', 'func')
> 
> and if I disassemble the code object I can see it being dereferenced:
> 
>>>> dis.dis(rsay.func_code)
> [snip for brevity]
>   5          22 LOAD_DEREF               0 (func)
>              25 LOAD_FAST                0 (args)
>              28 CALL_FUNCTION_VAR        0
>              31 RETURN_VALUE
> 
> but if I look at the closure object, nothing seems useful:
> 
>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__',
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']
> 
> 
> and I can't find any other attributes which refers back to the undecorated
> original function.
> 
> 

Following Terry's lead it turns out that cell contents become easily
accessible in python 2.5:

$ cat cellcontents.py
"""
>>> def reverse(func):
...     def f(*args):
...         args = list(args)
...         args.reverse()
...         return func(*args)
...     return f
...
>>> def say(*args):
...     print args
...
>>> rsay = reverse(say)
>>> del say
>>> c = rsay.func_closure[0]
>>> "cell_contents" in dir(c)
True
>>> c.cell_contents(1,2,3)
(1, 2, 3)
>>>
"""

import doctest
doctest.testmod()
$ python2.6 cellcontents.py
$ python2.5 cellcontents.py
$ python2.4 cellcontents.py
**********************************************************************
File "cellcontents.py", line 15, in __main__
Failed example:
    "cell_contents" in dir(c)
Expected:
    True
Got:
    False
**********************************************************************
File "cellcontents.py", line 17, in __main__
Failed example:
    c.cell_contents(1,2,3)
Exception raised:
    Traceback (most recent call last):
      File "doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest __main__[6]>", line 1, in ?
        c.cell_contents(1,2,3)
    AttributeError: 'cell' object has no attribute 'cell_contents'
**********************************************************************
1 items had failures:
   2 of   7 in __main__
***Test Failed*** 2 failures.

Peter


From mail at timgolden.me.uk  Sun Feb 15 04:53:24 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 15 Feb 2009 09:53:24 +0000
Subject: GetKeyboardLayoutName Win32API
In-Reply-To: <gn7oei$1hmu$1@adenine.netfront.net>
References: <gn7oei$1hmu$1@adenine.netfront.net>
Message-ID: <4997E614.2080209@timgolden.me.uk>

Tsolakos Stavros wrote:
> Hi all.
> 
> I was trying to find a way to read the currently selected input layout
> from an app written in python. I am aware that if the app were written
> in C, I would have to call the GetKeyboardLayoutName() function. How can
> this be done in Python? I want to avoid writing an extension just for
> this. The function is not available through pywin32.

<code>
import ctypes

s = ctypes.create_unicode_buffer (1024)
ctypes.windll.user32.GetKeyboardLayoutNameW (s)

print s.value

</code>

TJG


From mail at microcorp.co.za  Sun Feb 15 05:04:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:04:37 +0200
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net><-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<4996F7A0.4060008@mrabarnett.plus.com>
Message-ID: <000201c98f58$2f7ec160$0d00a8c0@hendrik>

"MRAB" <google at m...tt.plus.com> wrote:

> Grant Edwards wrote:
> > On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> > 
> >> Can Python's serial port support be made to run at 45.45 baud,
> >> the old "60 speed" Teletype machine speed? 
> > 
> > If your hardware and OS supports it, Python can be made to
> > support it.
> > 
> [snip]
> I had a quick look at the Windows API. The struct member for the baud
> rate is of type DWORD, ie an integer.

I think there could be other hassles - the baud rate is basically derived
by setting a divisor that divides a high frequency clock that is
fed to the UART chip. Now this means that the frequency, 
and the maximum value of the divisor, defines the lowest
rate that can be attained.  The chips are standard, so the maximum
divisor is fixed, but the frequency fed the chip is a design parameter
of the motherboard.

So you could be lucky, or you might have to change the hardware...

- Hendrik





From stefan_ml at behnel.de  Sun Feb 15 05:05:34 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 15 Feb 2009 11:05:34 +0100
Subject: ImportError: dynamic module does not define init function
	(inittypes)
In-Reply-To: <mailman.9551.1234668644.3487.python-list@python.org>
References: <mailman.9551.1234668644.3487.python-list@python.org>
Message-ID: <4997e8ee$0$31879$9b4e6d93@newsspool3.arcor-online.net>

konteya joshi wrote:
> I see the following error on running the program:
> 
> 'import site' failed; use -v for traceback
> Traceback (most recent call last):
>   File "skyline\alpine_kickoff.py", line 6, in ?
>     import re
>   File "C:\Perforce\qa\testware\build\vmqa\python\python-2.4.1-as\lib\re.py",
> line 5, in ?
>     from sre import *
>   File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\sre.py",
> line 265, in ?
>     import copy_reg
>   File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\copy_reg.py",
> line 7, in ?
>     from types import ClassType as _ClassType
> ImportError: dynamic module does not define init function (inittypes)
> 
> Any body who would have an idea on what might be going wrong?
> 
> I have python-2.4.1-as directory in my PYTHONPATH which contains the
> Lib,libs...etc in the directory. The Lib contains the re,sre,copy_reg
> inside the directory.

Check if you have a file "types.dll" somewhere in your PYTHONPATH. If
Python finds such a file when resolving the "import types" statement, it
will try to import the DLL instead of the correct module.

Stefan


From mail at microcorp.co.za  Sun Feb 15 05:18:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:18:37 +0200
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net><-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet><49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <000301c98f58$30144aa0$0d00a8c0@hendrik>

"John Nagle" <nagle at ...ats.com>wrote:


> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)

If you can get down so low in baud rate, then you can fudge it in software.
Set the port to the single stop bit, and make a transmit character function
that outputs a single character and a flush(), and then waits for a bit time 
or so - time.sleep(0.022) will do the trick - means you have to make
a string transmitter that calls your character transmitter - you cannot
just write a string to the port - but that is no great hardship.

The receive side will not be a problem, as the syncing is done every char.

- Hendrik




From hniksic at xemacs.org  Sun Feb 15 05:27:36 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 15 Feb 2009 11:27:36 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <87ocx4hu5j.fsf@mulj.homelinux.net>

Steven D'Aprano <steve at pearwood.info> writes:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
>
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
>
> def say(*args):
>     print args
>
> rsay = reverse(say)
> del say
>
> Is there any way to peek inside the decorated function rsay() to get access
> to the undecorated function say()?

This works in Python 2.5.2:

>>> rsay.func_closure[0].cell_contents
<function say at 0xb7e67224>

Of course, this applies only if you know there's only one free
variable, and you know that the decorator is in fact implemented with
a closure, and so on.

>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__', 
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']

I got 'cell_contents' as well when I did the 'dir', at least under
Python 2.5.2.


From mail at microcorp.co.za  Sun Feb 15 05:40:34 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:40:34 +0200
Subject: Fw: Can Python serial support run at 45.45 baud?
Message-ID: <001201c98f59$d53a5140$0d00a8c0@hendrik>

"Hendrik van Rooyen" <ma... at m....orp.co.za> wrote:

> If you can get down so low in baud rate, then you can fudge it in software.
> Set the port to the single stop bit, and make a transmit character function
> that outputs a single character and a flush(), and then waits for a bit time 
> or so - time.sleep(0.022) will do the trick - means you have to make
> a string transmitter that calls your character transmitter - you cannot
> just write a string to the port - but that is no great hardship.

Talking nonsense again - the sleep time must not be just the bit
you want to add to the character, but the full character time,
start bit, five data, stop + 1/2 bit time. - 7.5 * 22 = 165 milliseconds.

- Hendrik




From castironpi at gmail.com  Sun Feb 15 05:48:08 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sun, 15 Feb 2009 02:48:08 -0800 (PST)
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
Message-ID: <4af8fc75-c2ef-4c9c-8829-560a9ae4df6c@r34g2000vbp.googlegroups.com>

On Feb 15, 4:27?am, Hrvoje Niksic <hnik... at xemacs.org> wrote:
> Steven D'Aprano <st... at pearwood.info> writes:
> > Suppose I have a function f() which I know has been decorated, but I don't
> > have access to the original undecorated function any longer:
>
> > def reverse(func):
> > ? ? def f(*args):
> > ? ? ? ? args = list(args)
> > ? ? ? ? args.reverse()
> > ? ? ? ? return func(*args)
> > ? ? return f
>
> > def say(*args):
> > ? ? print args
>
> > rsay = reverse(say)
> > del say
>
> > Is there any way to peek inside the decorated function rsay() to get access
> > to the undecorated function say()?
>
> This works in Python 2.5.2:
>
> >>> rsay.func_closure[0].cell_contents
>
> <function say at 0xb7e67224>
>
> Of course, this applies only if you know there's only one free
> variable, and you know that the decorator is in fact implemented with
> a closure, and so on.
>
> >>>> dir(rsay.func_closure[0])
> > ['__class__', '__cmp__', '__delattr__', '__doc__',
> > '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> > '__reduce_ex__', '__repr__', '__setattr__', '__str__']
>
> I got 'cell_contents' as well when I did the 'dir', at least under
> Python 2.5.2.

Assume the decorator preserves the function at all; that is, it
doesn't discard it.  Then you can scan func_closure.  In poor cases,
you might have to search through a nested decoration as well.  In
others, such as when the decorator is an object, not a function, you
might have to search an instance dictionary, also possibly nested.
The leading assumption also requires that the function is stored in a
Python object; that is, not in a C structure.

In Python 3.0.1:

>>> def f( fun ):
...     def g( *ar, **kw ):
...             return fun( *ar, **kw )
...     return g
...
>>> def h( x ):
...     print( x )
...
>>> i= f( h )
>>> i.__closure__[0].cell_contents
<function h at 0x00B59810>


From zaheer.agadi at gmail.com  Sun Feb 15 05:55:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 15 Feb 2009 02:55:41 -0800 (PST)
Subject: Python WebDAV library
Message-ID: <75f5d38b-bb93-4d9d-bc64-d073ee0c1992@w1g2000prm.googlegroups.com>

Hi

I am looking for  WebDAV library in Python

I found one in
http://users.sfo.com/~jdavis/Software/PyDAV/readme.html
and one here
http://pypi.python.org/packages/any/P/Python_WebDAV_Library/


I basically have to upload and download files/folders to/from a server
should be able to copy them move them and delete.

Any body know if these serve the purpose or there are   libraries more
promising than listed above

Thanks






From steve at pearwood.info  Sun Feb 15 06:39:32 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 22:39:32 +1100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
Message-ID: <01a7f49a$0$11497$c3e8da3@news.astraweb.com>

Hrvoje Niksic wrote:

>> Is there any way to peek inside the decorated function rsay() to get
>> access to the undecorated function say()?
> 
> This works in Python 2.5.2:
> 
>>>> rsay.func_closure[0].cell_contents
> <function say at 0xb7e67224>

Thanks to everyone who responded.


The reason I ask is because I've just spent the weekend battling with
doctests of decorated functions, and discovering that without
functools.wraps() all my doctests weren't being called. I'm wondering
whether it would be a good idea for doctest to auto-detect tests in
closures.

This is not needed if you call wraps() appropriately, but you might not
always do that.



-- 
Steven



From __peter__ at web.de  Sun Feb 15 07:23:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 15 Feb 2009 13:23:33 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn91g3$umj$00$1@news.t-online.com>

Steven D'Aprano wrote:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get
> access to the undecorated function say()?

Here's a hack for Python 2.4:

def make_extractor(x=None):
    def extractor(): return x
    return extractor

extractor = make_extractor()
function = type(extractor)

def get_cell_contents(cell):
    return function(extractor.func_code, {}, "yadda", None, (cell,))()

get_cell_contents(rsay.func_closure[0])(1,2,3)

Peter


From duncan.booth at invalid.invalid  Sun Feb 15 07:52:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 15 Feb 2009 12:52:12 GMT
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
	<01a7f49a$0$11497$c3e8da3@news.astraweb.com>
Message-ID: <Xns9BB382D534088duncanbooth@127.0.0.1>

Steven D'Aprano <steve at pearwood.info> wrote:
> 
> The reason I ask is because I've just spent the weekend battling with
> doctests of decorated functions, and discovering that without
> functools.wraps() all my doctests weren't being called. I'm wondering
> whether it would be a good idea for doctest to auto-detect tests in
> closures.
> 
> This is not needed if you call wraps() appropriately, but you might not
> always do that.
> 

I don't think it is a good idea to call the wrapped doctests automatically, 
but I do think it might be a good idea to detect and warn about anything 
which looks like it is a wrapper where the wrapped function includes a 
doctest and the wrapper doesn't.


-- 
Duncan Booth http://kupuguy.blogspot.com


From steve at holdenweb.com  Sun Feb 15 07:53:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 07:53:44 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>	<mailman.9344.1234381941.3487.python-list@python.org>	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>	<x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
	<pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>
Message-ID: <gn938s$rhc$1@ger.gmane.org>

W. eWatson wrote:
> It looks like I got an accidentally case of send message 3 times. Well,
> here's a correct below.
>> The question now is what can I do about it? reboot?
>>
>> Just to re-iterate the answer I provided to *>the question to a post
>> above<*, I'm using Tkinter for the program's GUI.
>>
> 
> 
Just stop running the damned thing under IDLE.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 15 08:03:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 08:03:42 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>	<mailman.9352.1234385290.3487.python-list@python.org>	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>	<gn20f7$d0e$1@ger.gmane.org>
	<7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>
Message-ID: <gn93ri$sm0$1@ger.gmane.org>

Stephen Hansen wrote:
>> # Absolute path to the directory that holds media.
>> # Example: "/home/media/media.lawrence.com/"
>> MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'
>>
>> Note that most Windows APIs allow you to use the forward slash as a
>> delimiter. It's mostly the command line and Windows Explorer that are
>> snotty about insisting on the backslash.
> 
> Idle curiosity, why do you prefer that to:
> 
> MEDIA_ROOT = os.path.join(fsroot, 'Projects', 'PytDj', 'images')
> 
> Not arguing that one is actually better then the other, just curious.
> 
Going for "good enough", I suppose. It's more readable, at least, not
that that makes a *huge* difference.

> In my own environment we have grown a whole big filesystem abstraction
> layer because we have to be able to address the same resources on
> network volumes in the same client on multiple OS's (mainly windows
> and mac presently, but a linux client has long been a
> consideration),... and on the mac having to sometimes use mac paths
> (":this:that:other") and sometimes posix paths ("/this/that/other")
> depending on what API layer I'm poking at in a given point of view...
> so personally I just end up being mildly curious how everyone else
> handles paths and such.
> 
> Cuz it was quite a bit of a pain early on.

The old Mac paths would indeed require your solution, which is strictly
speaking the best.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Sun Feb 15 08:05:04 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 15 Feb 2009 14:05:04 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <87vdrciysm.fsf@mulj.homelinux.net>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
Message-ID: <6vqi81FliulnU1@mid.uni-berlin.de>

Hrvoje Niksic schrieb:
> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> The answer is easy: if you use C, you can use ctypes to create a
>> wrapper - with pure python, no compilation, no platform issues.
> 
> The last part is not true.  ctypes doesn't work on 64-bit
> architectures, nor does it work when Python is built with non-gcc Unix
> compilers.

It's not working on Windows with the standard distribution?

I'm sorry for spreading FUD about being no issues at all, that 
apparently wasn't right - however, so far I didn't encounter them.

Diez


From steve at holdenweb.com  Sun Feb 15 08:41:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 08:41:17 -0500
Subject: "Byte" type?
In-Reply-To: <go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
Message-ID: <gn9621$2hk$1@ger.gmane.org>

Erik Max Francis wrote:
> John Nagle wrote:
>>     With "bytearray", the element type is considered to be "unsigned
>> byte",
>> or so says PEP 3137: "The element data type is always 'B' (i.e.
>> unsigned byte)."
>>
>> Let's try:
>>
>> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
>> (Intel)] on
>> win32
>>  >>> xx = b'x'
>>  >>> repr(xx)
>> "'x'"
>>  >>> repr(xx[0])
>> "'x'"
>>  >>> repr(xx[0][0])
>> "'x'"
>>  >>>
>>
>> But that's not what "repr" indicates.  The bytearray element is
>> apparently
>> being promoted to "bytes" as soon as it comes out of the array.
> 
> There's no distinction byte type.  A single character of a bytes type is
> also a bytes.
> 
Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
to enable easier forward compatibility with the 3.X series ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From roy at panix.com  Sun Feb 15 08:51:29 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 08:51:29 -0500
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
	<49972f28$0$1622$742ec2ed@news.sonic.net>
	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>
Message-ID: <roy-7CAA41.08512915022009@news.panix.com>

In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>,
 Grant Edwards <grante at visi.com> wrote:

> My guess is that it was _supposed_ to
> be a CRC routine, but somebody botched it.  They used the same
> botched routine on the host end when they did testing, so
> nobody noticed it was broken. 

Stuff like this happens all the time.  That's why RFC 2026 requires, "a 
specification from which at least two independent and interoperable 
implementations from different code bases have been developed".

To drag this back on topic, however, it's interesting to note that Python 
itself has been successful, while still being essentially a single 
implementation.


From benjamin at python.org  Sun Feb 15 09:32:15 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sun, 15 Feb 2009 14:32:15 +0000 (UTC)
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
Message-ID: <loom.20090215T143129-868@post.gmane.org>

Steve Holden <steve <at> holdenweb.com> writes:
> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
> to enable easier forward compatibility with the 3.X series ...

It's not an ugly hack. It just isn't all that you might hope it'd live up to be.






From theller at python.net  Sun Feb 15 09:45:10 2009
From: theller at python.net (Thomas Heller)
Date: Sun, 15 Feb 2009 15:45:10 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <mailman.9545.1234642143.3487.python-list@python.org>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>	<6vocf5Fkv5a9U1@mid.uni-berlin.de>	<87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
Message-ID: <6vqo3kFlerq0U1@mid.individual.net>

Christian Heimes schrieb:
> Hrvoje Niksic schrieb:
>> "Diez B. Roggisch" <deets at nospam.web.de> writes:
>> 
>>> The answer is easy: if you use C, you can use ctypes to create a
>>> wrapper - with pure python, no compilation, no platform issues.
>> 
>> The last part is not true.  ctypes doesn't work on 64-bit
>> architectures, nor does it work when Python is built with non-gcc Unix
>> compilers
> 
> ctypes works on 64bit systems, too. However it's a pain in the ... back
> to write code with ctypes that works across all platforms. I used to use
> ctypes for wrapper but eventually I switched to Cython.
> 

I have plans to add the types from the ansi-c standard to ctypes, like these:

stddef.h: ptrdiff_t, size_t, wchar_t
signal.h: sig_atomic_t
stdio.h: FILE, fpos_t, stderr, stdout, stdin
stdlib.h: div_t, ldiv_t
time.h: clock_t, time_t, struct tm

Do you think that would have helped for writing cross-platform wrappers?

Thomas


From google at mrabarnett.plus.com  Sun Feb 15 09:56:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 14:56:12 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <roy-7CAA41.08512915022009@news.panix.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>	<roy-0D11C8.14103914022009@news.panix.com>	<49972f28$0$1622$742ec2ed@news.sonic.net>	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>
	<roy-7CAA41.08512915022009@news.panix.com>
Message-ID: <49982D0C.8020604@mrabarnett.plus.com>

Roy Smith wrote:
> In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>, 
> Grant Edwards <grante at visi.com> wrote:
> 
>> My guess is that it was _supposed_ to be a CRC routine, but
>> somebody botched it.  They used the same botched routine on the
>> host end when they did testing, so nobody noticed it was broken.
> 
> Stuff like this happens all the time.  That's why RFC 2026 requires,
> "a specification from which at least two independent and
> interoperable implementations from different code bases have been
> developed".
> 
> To drag this back on topic, however, it's interesting to note that
> Python itself has been successful, while still being essentially a
> single implementation.
> 
That's because it's open source, so many people can test and debug it.


From deets at nospam.web.de  Sun Feb 15 10:23:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 15 Feb 2009 16:23:00 +0100
Subject: python in emacs
In-Reply-To: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
References: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
Message-ID: <6vqqakFlct0rU1@mid.uni-berlin.de>

kentandkat at sbcglobal.net schrieb:
> When I visit a file with extension .py, emacs says "loading
> python...done", and gives me a "python" menu with options like "start
> interpreter" and "eval buffer". When I try to use one of these options
> emacs says "loading compile...done", then hangs and has to be shut down
> from the task manager. The Python folder is in my PATH variable and
> works fine from the command line (or with IDLE). I'm using emacs-22.3 on
> windows xp, and have the same problem with both python-2.2 and
> python-3.0. Anybody got any tips, or should I just give up and use some
> other editor?

Did you try setting the python interpreter with the full path?

Diez


From steve at holdenweb.com  Sun Feb 15 10:32:33 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 10:32:33 -0500
Subject: "Byte" type?
In-Reply-To: <loom.20090215T143129-868@post.gmane.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org>
	<loom.20090215T143129-868@post.gmane.org>
Message-ID: <gn9cim$ldf$1@ger.gmane.org>

Benjamin Peterson wrote:
> Steve Holden <steve <at> holdenweb.com> writes:
>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>> to enable easier forward compatibility with the 3.X series ...
> 
> It's not an ugly hack. It just isn't all that you might hope it'd live up to be.
> 
I take it back
It's not an ugly hack
It's just an aliased type

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 15 10:33:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 10:33:57 -0500
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49982D0C.8020604@mrabarnett.plus.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>	<roy-0D11C8.14103914022009@news.panix.com>	<49972f28$0$1622$742ec2ed@news.sonic.net>	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>	<roy-7CAA41.08512915022009@news.panix.com>
	<49982D0C.8020604@mrabarnett.plus.com>
Message-ID: <gn9cl9$ldf$2@ger.gmane.org>

MRAB wrote:
> Roy Smith wrote:
>> In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>, Grant
>> Edwards <grante at visi.com> wrote:
>>
>>> My guess is that it was _supposed_ to be a CRC routine, but
>>> somebody botched it.  They used the same botched routine on the
>>> host end when they did testing, so nobody noticed it was broken.
>>
>> Stuff like this happens all the time.  That's why RFC 2026 requires,
>> "a specification from which at least two independent and
>> interoperable implementations from different code bases have been
>> developed".
>>
>> To drag this back on topic, however, it's interesting to note that
>> Python itself has been successful, while still being essentially a
>> single implementation.
>>
> That's because it's open source, so many people can test and debug it.

IronPython, J(P)ython and PyPy? TinyPython? Jython must be over ten
years old now.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From kentandkat at sbcglobal.net  Sun Feb 15 10:40:55 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Sun, 15 Feb 2009 09:40:55 -0600
Subject: python in emacs 
Message-ID: <ur61zhfnc.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

When I visit a file with extension .py, emacs says "loading
Python...done" and gives me a "Python" menu with options like "start
interpreter" and "eval buffer". When I try to use these options, or
others on the "Python" menu, emacs
says "loading compile...done", then hangs and has to be shut down from
the task bar. The folder containing python is in my PATH and python
works from the command line (and IDLE). Neither the emacs nor the python
directory tree has any spaces in it. I'm using emacs-22.3 on windows
xp and have tried using both python-2.2 and python-3.0 in emacs with the
same problem. Can anyone give me a tip?

Thanks,
Kent.


From nick at craig-wood.com  Sun Feb 15 11:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 15 Feb 2009 10:31:55 -0600
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de> <87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
Message-ID: <slrngpgdb7.ug6.nick@irishsea.home.craig-wood.com>

Christian Heimes <lists at cheimes.de> wrote:
>  Hrvoje Niksic schrieb:
> > "Diez B. Roggisch" <deets at nospam.web.de> writes:
> > 
> >> The answer is easy: if you use C, you can use ctypes to create a
> >> wrapper - with pure python, no compilation, no platform issues.
> > 
> > The last part is not true.  ctypes doesn't work on 64-bit
> > architectures, nor does it work when Python is built with non-gcc Unix
> > compilers
> 
>  ctypes works on 64bit systems, too. However it's a pain in the ... back
>  to write code with ctypes that works across all platforms. I used to use
>  ctypes for wrapper but eventually I switched to Cython.

What sort of problems have you had?

I find as long as I use the same types as the C code actually uses it
all works fine.  If on a 64 bit platform long is 64 bits then it will
be under ctypes too.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nagle at animats.com  Sun Feb 15 11:57:12 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 08:57:12 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.9565.1234708354.3487.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
Message-ID: <499841bf$0$1624$742ec2ed@news.sonic.net>

Benjamin Peterson wrote:
> Steve Holden <steve <at> holdenweb.com> writes:
>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>> to enable easier forward compatibility with the 3.X series ...
> 
> It's not an ugly hack. It just isn't all that you might hope it'd live up to be.

    The semantics aren't what the naive user would expect.  One would
expect an element of a bytearray to be a small integer.  But instead,
it has string-like behavior.  "+" means concatenate, not add.
The bit operators don't work at all.

Python 2.6.1 ...
 >>> a = b'A'
 >>> b = b'B'
 >>> a+b
'AB'
 >>> a[0]+b[0]
'AB'
 >>>>>> a = b'A'
 >>> b = b'B'
 >>> a+b
'AB'
 >>> a[0]+b[0]
'AB'
 >>>
 >>> a & b
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for &: 'str' and 'str'

    Given that the intent of bytearray is that it's a data type for
handling raw binary data of unknown format, one might expect it to behave like
"array.array('B')", which is an array of unsigned bytes that are
treated as integers.  But that's not how "bytearray" works.  "bytearray"
is more like the old meaning of "str", before Unicode support, circa Python 2.1.

    I sort of understand the mindset, but the documentation needs to be improved.
Right now, we have a few PEPs and the 2.6 "New features" article, but
no comprehensive documentation.  The relationship between "str", "unicode",
"bytearray", "array.array('B')", and integers, and how this changes from
version to version of Python, needs to be made clearer, or conversion
to 2.6/3.0 will not happen rapidly.

				John Nagle


From benjamin.kaplan at case.edu  Sun Feb 15 12:16:10 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 15 Feb 2009 12:16:10 -0500
Subject: "Byte" type?
In-Reply-To: <499841bf$0$1624$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
Message-ID: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>

On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:

> Benjamin Peterson wrote:
>
>> Steve Holden <steve <at> holdenweb.com> writes:
>>
>>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>>> to enable easier forward compatibility with the 3.X series ...
>>>
>>
>> It's not an ugly hack. It just isn't all that you might hope it'd live up
>> to be.
>>
>
>   The semantics aren't what the naive user would expect.  One would
> expect an element of a bytearray to be a small integer.  But instead,
> it has string-like behavior.  "+" means concatenate, not add.
> The bit operators don't work at all.
>

Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
a bytearray, it behaves like you expect.
>>> type(b'x')
<class 'bytes'>
>>> type(bytearray(b'x'))
<class 'bytearray'>
>>> ba = bytearray(b'abc')
>>> ba[0] + ba[1]
195



>
> Python 2.6.1 ...
> >>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>>>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>
> >>> a & b
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> TypeError: unsupported operand type(s) for &: 'str' and 'str'
>
>   Given that the intent of bytearray is that it's a data type for
> handling raw binary data of unknown format, one might expect it to behave
> like
> "array.array('B')", which is an array of unsigned bytes that are
> treated as integers.  But that's not how "bytearray" works.  "bytearray"
> is more like the old meaning of "str", before Unicode support, circa Python
> 2.1.
>
>   I sort of understand the mindset, but the documentation needs to be
> improved.
> Right now, we have a few PEPs and the 2.6 "New features" article, but
> no comprehensive documentation.  The relationship between "str", "unicode",
> "bytearray", "array.array('B')", and integers, and how this changes from
> version to version of Python, needs to be made clearer, or conversion
> to 2.6/3.0 will not happen rapidly.
>
>                                John Nagle
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pauljefferson at gmail.com  Sun Feb 15 12:31:23 2009
From: pauljefferson at gmail.com (Paul)
Date: Sun, 15 Feb 2009 09:31:23 -0800 (PST)
Subject: BaseHttpServer
Message-ID: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>

Hi,
I currently have a webserver using BaseHttpServe that serves images
like this:
if self.path.endswith(".jpg"):
                print(curdir + sep + self.path)
                f = open(curdir + sep + self.path,"b")
                self.send_response(200)
                self.send_header('Content-type',	'image/jpg')
                self.end_headers()
                self.wfile.write(f.read())
                f.close()
                return
Whilst it works, it does take quite a while to load (approx 10secs for
a 4mb file even though its over the local connection) - does anyone
have any hints/tips for speeding it up?
Thanks,
Paul


From fasteliteprogrammer at yahoo.com  Sun Feb 15 12:41:46 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Sun, 15 Feb 2009 09:41:46 -0800 (PST)
Subject: python in emacs
Message-ID: <107637.91428.qm@web36506.mail.mud.yahoo.com>

I would go to ubuntu linux if you can.

--- On Sun, 2/15/09, Diez B. Roggisch <deets at nospam.web.de> wrote:

From: Diez B. Roggisch <deets at nospam.web.de>
Subject: Re: python in emacs
To: python-list at python.org
Date: Sunday, February 15, 2009, 9:23 AM

kentandkat at sbcglobal.net schrieb:
> When I visit a file with extension .py, emacs says "loading
> python...done", and gives me a "python" menu with options like "start
> interpreter" and "eval buffer". When I try to use one of these options
> emacs says "loading compile...done", then hangs and has to be shut down
> from the task manager. The Python folder is in my PATH variable and
> works fine from the command line (or with IDLE). I'm using emacs-22.3 on
> windows xp, and have the same problem with both python-2.2 and
> python-3.0. Anybody got any tips, or should I just give up and use some
> other editor?

Did you try setting the python interpreter with the full path?

Diez
--
http://mail.python.org/mailman/listinfo/python-list



      
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From python at bdurham.com  Sun Feb 15 12:46:56 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 12:46:56 -0500
Subject: Pythonic way to determine if a string is a number
Message-ID: <1234720016.23422.1300488109@webmail.messagingengine.com>

What's the Pythonic way to determine if a string is a number? By
number I mean a valid integer or float.

I searched the string and cMath libraries for a similar function
without success. I can think of at least 3 or 4 ways to build my
own function.

Here's what I came up with as a proof-of-concept. Are there
'better' ways to perform this type of test?

Thanks,
Malcolm

<code>
def isnumber( input ):
    try:
        if '.' in input:
            num = float( input )
        else:
            num = int( input )
        return True

    except ValueError:
        return False

if __name__ == '__main__':
    tests = """
        12
        -12
        -12.34
        .0
        .
        1 2 3
        1 . 2
        just text
    """

    for test in tests.split( '\n' ):
        print 'test (%0s), isnumber: %1s' % \
          ( test.strip(), isnumber( test ) )

</code>


From lists at cheimes.de  Sun Feb 15 12:51:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 18:51:57 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <gn9knt$du2$1@ger.gmane.org>

python at bdurham.com schrieb:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
> 
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
> 
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
> 
> Thanks,
> Malcolm
> 
> <code>
> def isnumber( input ):
>     try:
>         if '.' in input:
>             num = float( input )
>         else:
>             num = int( input )
>         return True
> 
>     except ValueError:
>         return False

You code doesn't check for several float representations like "1e10",
"1E10", "inf" and "nan".

Christian



From pavanmishra at gmail.com  Sun Feb 15 12:54:31 2009
From: pavanmishra at gmail.com (Pavan Mishra)
Date: Sun, 15 Feb 2009 09:54:31 -0800 (PST)
Subject: PHP like documentation?
Message-ID: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>

I was wondering if I can use python documentation source
(reStructuredText) and restructure it along the lines of PHP
documentation. Allowing users to add comments, improving search etc.

I was thinking if it would be useful.


From metolone+gmane at gmail.com  Sun Feb 15 12:58:33 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sun, 15 Feb 2009 09:58:33 -0800
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org><mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
Message-ID: <gn9l46$fcn$1@ger.gmane.org>


"John Nagle" <nagle at animats.com> wrote in message 
news:499841bf$0$1624$742ec2ed at news.sonic.net...
> Benjamin Peterson wrote:
>> Steve Holden <steve <at> holdenweb.com> writes:
>>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>>> to enable easier forward compatibility with the 3.X series ...
>>
>> It's not an ugly hack. It just isn't all that you might hope it'd live up 
>> to be.
>
>    The semantics aren't what the naive user would expect.  One would
> expect an element of a bytearray to be a small integer.  But instead,
> it has string-like behavior.  "+" means concatenate, not add.
> The bit operators don't work at all.
>
> Python 2.6.1 ...
> >>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>>>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>
> >>> a & b
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: unsupported operand type(s) for &: 'str' and 'str'
>
>    Given that the intent of bytearray is that it's a data type for
> handling raw binary data of unknown format, one might expect it to behave 
> like
> "array.array('B')", which is an array of unsigned bytes that are
> treated as integers.  But that's not how "bytearray" works.  "bytearray"
> is more like the old meaning of "str", before Unicode support, circa 
> Python 2.1.

It *is* the old meaning of str.  It isn't a bytearray object in 2.6.X (and 
it isn't a bytearray object in 3.X either, but a bytes object):

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> type(b'x')
<type 'str'>
>>> b'x'[0]
'x'

As Steve said, it is just an aliased type.  In 3.X it is really a bytes 
object:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> type(b'x')
<class 'bytes'>
>>> b'x'[0]
120

-Mark




From philip at semanchuk.com  Sun Feb 15 13:03:36 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 15 Feb 2009 13:03:36 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>


On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:

> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.


try:
    int(number)
    is_an_int = True
except:
    is_an_int = False

try:
    float(number)
    is_a_float = True
except:
    is_a_float = False

is_a_number = (is_an_int or is_a_float)




From nagle at animats.com  Sun Feb 15 13:09:09 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:09:09 -0800
Subject: "Byte" type?
In-Reply-To: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	
	<gn9621$2hk$1@ger.gmane.org>	
	<mailman.9565.1234708354.3487.python-list@python.org>	
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
Message-ID: <49985A45.7030507@animats.com>

Benjamin Kaplan wrote:
> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
> 
>> Benjamin Peterson wrote:

> Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
> a bytearray, it behaves like you expect.
>>>> type(b'x')
> <class 'bytes'>
>>>> type(bytearray(b'x'))
> <class 'bytearray'>
>>>> ba = bytearray(b'abc')
>>>> ba[0] + ba[1]
> 195

    That's indeed how Python 2.6 works.  But that's not how
PEP 3137 says it's supposed to work.

Guido:

  "I propose the following type names at the Python level:

         * bytes is an immutable array of bytes (PyString)
         * bytearray is a mutable array of bytes (PyBytes)"

...

"Indexing bytes and bytearray returns small ints (like the bytes type in
3.0a1, and like lists or array.array('B'))."
(Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
object with length 1.)

"b1 + b2: concatenation. With mixed bytes/bytearray operands, the return type is 
that of the first argument (this seems arbitrary until you consider how += works)."
(Not true in Python 2.6 - concatenation returns a bytearray in both cases.)

Is this a bug, a feature, a documentation error, or bad design?

				John Nagle


From roy at panix.com  Sun Feb 15 13:15:38 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 13:15:38 -0500
Subject: Pythonic way to determine if a string is a number
References: <mailman.9571.1234720024.3487.python-list@python.org>
Message-ID: <roy-315A91.13153815022009@news.panix.com>

In article <mailman.9571.1234720024.3487.python-list at python.org>,
 python at bdurham.com wrote:

> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.

try:
   int(myString)
except ValueError:
   print "That's bogus, man"


From lists at cheimes.de  Sun Feb 15 13:27:03 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 19:27:03 +0100
Subject: relocation R_X86_64_32 against `a local symbol' can not be used
	when    making a shared object; recompile with -fPIC
In-Reply-To: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>
References: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>
Message-ID: <gn9mpn$kp5$1@ger.gmane.org>

tkevans schrieb:
> Found a couple of references to this in the newsgroup, but no
> solutions.
> 
> I'm trying to build libsbml-3.3.0 with python 2.5.4 support on RHEL
> 5.3.  This RedHat distro has python 2.4.5, and libsbml builds ok with
> that release.
> 
> After building 2.5.4 (./configure CFLAGS=-fPIC , as the error message
> suggests), ld still croaks here:

How about compiling Python as a shared library? ./configure
--enable-shared does the trick.

Christian



From lists at cheimes.de  Sun Feb 15 13:27:47 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 19:27:47 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
Message-ID: <gn9mr3$kp5$2@ger.gmane.org>

Philip Semanchuk schrieb:
> 
> On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
> 
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
> 
> 
> try:
>    int(number)
>    is_an_int = True
> except:
>    is_an_int = False

Please don't teach new Python developers to use bare excepts. In fact
never use bare excepts at all!

Christian



From zubeido at yahoo.com.br  Sun Feb 15 13:33:15 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sun, 15 Feb 2009 10:33:15 -0800 (PST)
Subject: Rapidshare to Megaupload script
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<mailman.9548.1234649831.3487.python-list@python.org>
Message-ID: <a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>

Thanks a lot for your input i really needed because i realized these
are minor flaws but even so define whether its good or bad code and i
really need to improve that. I already implemented the changes you
suggested and this one,

>  cookie = dict(x.split("=") for x in cookie)

for me is just very good and really is elegant.
An aspect you didn't mention was the
>    urls.append("http://rapidshare.com/files/" + retrieved_data[0] + "/" + retrieved_data[1])
I think its very hackish and crude but urlparser doesnt seem to accept
more than one argument at a time and doing it in a loop seem worse
than the current solution. What would you do?
 Thanks a lot again


From zubeido at yahoo.com.br  Sun Feb 15 13:33:25 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sun, 15 Feb 2009 10:33:25 -0800 (PST)
Subject: Rapidshare to Megaupload script
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<mailman.9548.1234649831.3487.python-list@python.org>
Message-ID: <896e9948-6dbc-4fb2-9ec2-74bb914166ab@33g2000yqm.googlegroups.com>

Thanks a lot for your input i really needed because i realized these
are minor flaws but even so define whether its good or bad code and i
really need to improve that. I already implemented the changes you
suggested and this one,

>  cookie = dict(x.split("=") for x in cookie)

for me is just very good and really is elegant.
An aspect you didn't mention was the
>    urls.append("http://rapidshare.com/files/" + retrieved_data[0] + "/" + retrieved_data[1])
I think its very hackish and crude but urlparser doesnt seem to accept
more than one argument at a time and doing it in a loop seem worse
than the current solution. What would you do?
 Thanks a lot again


From nagle at animats.com  Sun Feb 15 13:35:26 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:35:26 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49972cf5$0$1612$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
	<49972cf5$0$1612$742ec2ed@news.sonic.net>
Message-ID: <499858c5$0$1618$742ec2ed@news.sonic.net>

John Nagle wrote:
> MRAB wrote:
>> John Nagle wrote:
>> [snip]
>>> So the correct combination, 5 bits with 1.5 stop bits, isn't 
>>> supported in
>>> Python.  1 stop bit will not physically work on Baudot teletypes; the
>>> main camshaft doesn't come around fast enough.  (Yes, there's an actual
>>> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
>>> Python level gets a reject at the Win32 level.  (Not sure why Win32
>>> doesn't allow that; extra stop bits just add delay, but don't hurt
>>> anything.  But it's not supported.)
> 
>    I patched PySerial to support "STOPBITS_ONE5", for 1.5 stop bits,
> and the big Teletype Model 15 is now banging out text from Python.

   Logged in as a PySerial bug, with discussion of fix:

[ 2603052 ] 5-bit mode not properly supported on Windows

   Linux support for nonstandard baud rates is possible, but needs a
call to "setserial", which is not standard POSIX.

				John Nagle


From nagle at animats.com  Sun Feb 15 13:40:11 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:40:11 -0800
Subject: "Byte" type?
In-Reply-To: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	
	<gn9621$2hk$1@ger.gmane.org>	
	<mailman.9565.1234708354.3487.python-list@python.org>	
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
Message-ID: <499859e2$0$1618$742ec2ed@news.sonic.net>

Benjamin Kaplan wrote:
> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
> 
>> Benjamin Peterson wrote:

> Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
> a bytearray, it behaves like you expect.
>>>> type(b'x')
> <class 'bytes'>
>>>> type(bytearray(b'x'))
> <class 'bytearray'>
>>>> ba = bytearray(b'abc')
>>>> ba[0] + ba[1]
> 195

    That's indeed how Python 2.6 works.  But that's not how
PEP 3137 says it's supposed to work.

Guido:

  "I propose the following type names at the Python level:

         * bytes is an immutable array of bytes (PyString)
         * bytearray is a mutable array of bytes (PyBytes)"

...

"Indexing bytes and bytearray returns small ints (like the bytes type in
3.0a1, and like lists or array.array('B'))."
(Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
object with length 1.)

"b1 + b2: concatenation. With mixed bytes/bytearray operands, the return type is
that of the first argument (this seems arbitrary until you consider how += works)."
(Not true in Python 2.6 - concatenation returns a bytearray in both cases.)

Is this a bug, a feature, a documentation error, or bad design?

				John Nagle


From google at mrabarnett.plus.com  Sun Feb 15 13:56:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 18:56:53 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-315A91.13153815022009@news.panix.com>
References: <mailman.9571.1234720024.3487.python-list@python.org>
	<roy-315A91.13153815022009@news.panix.com>
Message-ID: <49986575.1040902@mrabarnett.plus.com>

Roy Smith wrote:
> In article <mailman.9571.1234720024.3487.python-list at python.org>,
>  python at bdurham.com wrote:
> 
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
> 
> try:
>    int(myString)
It could be a float, so:

     float(myString)

This will work even if it's an int.

> except ValueError:
>    print "That's bogus, man"
> 



From roy at panix.com  Sun Feb 15 14:01:12 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 14:01:12 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
Message-ID: <roy-24DB5B.14011215022009@news.panix.com>

In article <mailman.9577.1234722607.3487.python-list at python.org>,
 Christian Heimes <lists at cheimes.de> wrote:

> Philip Semanchuk schrieb:
> > 
> > On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
> > 
> >> What's the Pythonic way to determine if a string is a number? By
> >> number I mean a valid integer or float.
> > 
> > 
> > try:
> >    int(number)
> >    is_an_int = True
> > except:
> >    is_an_int = False
> 
> Please don't teach new Python developers to use bare excepts. In fact
> never use bare excepts at all!

I agree that the bare except is incorrect in this situation, but I don't 
agree that you should *never* use them.

They make sense when you need to recover from any error that may occur, 
possibly as the last resort after catching and dealing with more specific 
exceptions. In an unattended embedded system (think Mars Rover), the 
top-level code might well be:

while 1:
   try:
      main()
   except:
      reset()

or perhaps even (Range Safety Controller):

try:
   main()
except:
   self_destruct()


From google at mrabarnett.plus.com  Sun Feb 15 14:10:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 19:10:42 +0000
Subject: Rapidshare to Megaupload script
In-Reply-To: <a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>	<mailman.9548.1234649831.3487.python-list@python.org>
	<a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>
Message-ID: <499868B2.2040705@mrabarnett.plus.com>

aiwarrior wrote:
> Thanks a lot for your input i really needed because i realized these 
> are minor flaws but even so define whether its good or bad code and i
> really need to improve that. I already implemented the changes you 
> suggested and this one,
> 
>> cookie = dict(x.split("=") for x in cookie)
> 
> for me is just very good and really is elegant. An aspect you didn't
> mention was the
>> urls.append("http://rapidshare.com/files/" + retrieved_data[0] +
>> "/" + retrieved_data[1])
> I think its very hackish and crude but urlparser doesnt seem to
> accept more than one argument at a time and doing it in a loop seem
> worse than the current solution. What would you do?
> 
re.findall() returns a list of tuples, so retrieved_data is a tuple and
the following will work:

     urls.append("http://rapidshare.com/files/%s/%s" % retrieved_data)


From rushik.upadhyay at gmail.com  Sun Feb 15 14:56:55 2009
From: rushik.upadhyay at gmail.com (rushik)
Date: Sun, 15 Feb 2009 11:56:55 -0800 (PST)
Subject: Cannot able to retreive compressed html URL
Message-ID: <ed5d8df0-0cd6-4b17-92d0-d409f2bfdbe7@f3g2000vbf.googlegroups.com>

Hi,
I am trying to build python script which retreives and analyze the
various URLs and generate reports.

Some of the urls are like "http://xyz.com/test.html.gz", I am trying
to retreive it using urllib2 library and then using gzip library
trying to decompress it.

ex - server_url is say - http://xyz.com/test.html.gz

                logpage = urllib2.urlopen(server_url)
                html_content = cal_logpage.read()
                logpage.close()

                gz_tmp = open("gzip.txt.gz", "w")
                gz_tmp.write(html_content)
                gz_tmp.close()
                f = gzip.open("gzip.txt.gz", "rb")
                file_content = f.read()
                f.close()

                #return the resulting html content.
                return html_content

on executing the code, its giving

zlib.error - Error -3 while decompressing: invalid distance too far
back

the same URL I am able to retreive in proper html page format from
browser

please let me know if I am doing something wrong here, or is there any
other better way to do so.

Thanks,
R


From dotancohen at gmail.com  Sun Feb 15 15:03:25 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Sun, 15 Feb 2009 22:03:25 +0200
Subject: Python interface to ODF documents?
Message-ID: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>

Is there a Python interface to ODF documents? I'm thinking of
something that will import, for example, an ADS spreadsheet into a
multidimensional array (including formulas and formatting) and let me
manipulate it, then save it back.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From lists at cheimes.de  Sun Feb 15 15:04:49 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 21:04:49 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-24DB5B.14011215022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
Message-ID: <gn9sh3$6jm$1@ger.gmane.org>

Roy Smith wrote:
> I agree that the bare except is incorrect in this situation, but I don't 
> agree that you should *never* use them.

A bare except should be used when followed by a raise

try:
   func()
except:
   log_error()
   raise

> They make sense when you need to recover from any error that may occur, 
> possibly as the last resort after catching and dealing with more specific 
> exceptions. In an unattended embedded system (think Mars Rover), the 
> top-level code might well be:
> 
> while 1:
>    try:
>       main()
>    except:
>       reset()

Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
and SyntaxError?

Christian



From python at bdurham.com  Sun Feb 15 15:05:01 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 15:05:01 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <gn9mr3$kp5$2@ger.gmane.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
Message-ID: <1234728301.16829.1300503743@webmail.messagingengine.com>

Thanks for everyone's feedback. I believe my original post's code
(updated following my signature) was in line with this list's feedback.

Christian: Thanks for reminding me about exponential formats. My updated
code accounts for these type of numbers. I don't need to handle inf or
nan values. My original code's except catches an explicit ValueError
exception per your concern about bare excepts.

Malcolm

<code>
# str_to_num.py

def isnumber( input ):
    try:
        num = float( input )
        return True

    except ValueError:
        return False

if __name__ == '__main__':
    tests = """
        12
        -12
        -12.34
        .0
        .
        1 2 3
        1 . 2

        1e10
        1E10
        inf
        nan

        12 and text
        just text
    """

    for test in tests.split( '\n' ):
        print 'test (%0s), isnumber: %1s' % ( test.strip(), isnumber(
        test ) )
</code>


From mail at timgolden.me.uk  Sun Feb 15 15:08:53 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 15 Feb 2009 20:08:53 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234728301.16829.1300503743@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<gn9mr3$kp5$2@ger.gmane.org>
	<1234728301.16829.1300503743@webmail.messagingengine.com>
Message-ID: <49987655.7020605@timgolden.me.uk>

python at bdurham.com wrote:
> <code>
> # str_to_num.py
> 
> def isnumber( input ):
>     try:
>         num = float( input )
>         return True
> 
>     except ValueError:
>         return False


Just for the info, Malcolm, you don't actually
need to assign the result of float (input)
to anything if you don't need to use it. All
you're looking for is the exception. Let the
intepreter convert it and then throw it away.

Also, as an alternative style which can be more
appropriate depending on the structure and intention
of what you're doing, you can use the else: clause
of the try-except block.

try:
    float (input)
except ValueError:
    return False
else:
    return True

TJG


From tino at wildenhain.de  Sun Feb 15 15:10:30 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sun, 15 Feb 2009 21:10:30 +0100
Subject: Python interface to ODF documents?
In-Reply-To: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <499876B6.2070304@wildenhain.de>

Hi,

Dotan Cohen wrote:
> Is there a Python interface to ODF documents? I'm thinking of
> something that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.

Yes, you have zipfile and a host of xml parsers included in the
standard lib. This works very well to my experience.

Not sure if an abstraction layer on top of that exists.

Regards
Tino


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From mailinglists at vanwingerde.net  Sun Feb 15 15:24:22 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sun, 15 Feb 2009 21:24:22 +0100
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <499879F6.8060505@vanwingerde.net>

Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.
> I was thinking if it would be useful.

Very good idea!



-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net
web: http://jaap.vanwingerde.net/


From quentel.pierre at wanadoo.fr  Sun Feb 15 15:31:50 2009
From: quentel.pierre at wanadoo.fr (Pierre Quentel)
Date: Sun, 15 Feb 2009 12:31:50 -0800 (PST)
Subject: BaseHttpServer
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
Message-ID: <67131875-26c6-48b2-b337-104ed4fa633c@v38g2000yqb.googlegroups.com>

On 15 f?v, 18:31, Paul <pauljeffer... at gmail.com> wrote:
> Hi,
> I currently have a webserver using BaseHttpServe that serves images
> like this:
> if self.path.endswith(".jpg"):
> ? ? ? ? ? ? ? ? print(curdir + sep + self.path)
> ? ? ? ? ? ? ? ? f = open(curdir + sep + self.path,"b")
> ? ? ? ? ? ? ? ? self.send_response(200)
> ? ? ? ? ? ? ? ? self.send_header('Content-type', ? ? ? ?'image/jpg')
> ? ? ? ? ? ? ? ? self.end_headers()
> ? ? ? ? ? ? ? ? self.wfile.write(f.read())
> ? ? ? ? ? ? ? ? f.close()
> ? ? ? ? ? ? ? ? return
> Whilst it works, it does take quite a while to load (approx 10secs for
> a 4mb file even though its over the local connection) - does anyone
> have any hints/tips for speeding it up?
> Thanks,
> Paul

Hi,

This is probably because you first load the file content in memory by
f.read() before sending it. In this case it's better to send the
content by chunk, using shutil : replace

    self.wfile.write(f.read())
by :
    shutil.copyfileobj(f,self.wfile)

- Pierre


From hackingkk at gmail.com  Sun Feb 15 15:32:15 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Mon, 16 Feb 2009 02:02:15 +0530
Subject: Python interface to ODF documents?
In-Reply-To: <499876B6.2070304@wildenhain.de>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
	<499876B6.2070304@wildenhain.de>
Message-ID: <1234729935.21750.0.camel@kk-laptop>

hello
look at python-ooolib
it can do what ever is needed and more.
happy hacking.
Krishnakant.
 
On Sun, 2009-02-15 at 21:10 +0100, Tino Wildenhain wrote:
> Hi,
> 
> Dotan Cohen wrote:
> > Is there a Python interface to ODF documents? I'm thinking of
> > something that will import, for example, an ADS spreadsheet into a
> > multidimensional array (including formulas and formatting) and let me
> > manipulate it, then save it back.
> 
> Yes, you have zipfile and a host of xml parsers included in the
> standard lib. This works very well to my experience.
> 
> Not sure if an abstraction layer on top of that exists.
> 
> Regards
> Tino
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From steve at holdenweb.com  Sun Feb 15 15:36:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 15:36:15 -0500
Subject: "Byte" type?
In-Reply-To: <499859e2$0$1618$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
Message-ID: <gn9uc4$c7h$1@ger.gmane.org>

John Nagle wrote:
> Benjamin Kaplan wrote:
>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>
>>> Benjamin Peterson wrote:
> 
>> Because b'x' is NOT a bytearray. It is a bytes object. When you
>> actually use
>> a bytearray, it behaves like you expect.
>>>>> type(b'x')
>> <class 'bytes'>
>>>>> type(bytearray(b'x'))
>> <class 'bytearray'>
>>>>> ba = bytearray(b'abc')
>>>>> ba[0] + ba[1]
>> 195
> 
>    That's indeed how Python 2.6 works.  But that's not how
> PEP 3137 says it's supposed to work.
> 
> Guido:
> 
>  "I propose the following type names at the Python level:
> 
>         * bytes is an immutable array of bytes (PyString)
>         * bytearray is a mutable array of bytes (PyBytes)"
> 
> ...
> 
> "Indexing bytes and bytearray returns small ints (like the bytes type in
> 3.0a1, and like lists or array.array('B'))."
> (Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
> object with length 1.)
> 
> "b1 + b2: concatenation. With mixed bytes/bytearray operands, the return
> type is
> that of the first argument (this seems arbitrary until you consider how
> += works)."
> (Not true in Python 2.6 - concatenation returns a bytearray in both cases.)
> 
> Is this a bug, a feature, a documentation error, or bad design?
> 
It's a feature. In fact all that was done to accommodate easier
migration to 3.x is easily shown in one statement:

>>> str is bytes
True
>>>

So that's why bytes works the way it does in 2.6 ... hence my contested
description of it as an "ugly hack". I am happy to withdraw "ugly", but
I think "hack" could still be held to apply.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From konteyaj at gmail.com  Sun Feb 15 15:38:17 2009
From: konteyaj at gmail.com (karan)
Date: Sun, 15 Feb 2009 12:38:17 -0800 (PST)
Subject: error while importing os
Message-ID: <fc16083e-b68a-448b-9007-7321e954ef7f@i18g2000prf.googlegroups.com>

Hi,

Iam new to python i see the following when iam in the python shell and
i try to import os,though i can import the sys and sys.path does
contain the path to the python binary or the folder where the python
binaries reside:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib\os.py",
line 683, in ?
    import copy_reg as _copy_reg
  File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib
\copy_reg.py", line 7, in ?
    from types import ClassType as _ClassType
ImportError: dynamic module does not define init function (inittypes)

I have the added the path to the Python which contain the python
binaries,DLLs to the PYTHONPATH.


Let me know what might be the reason for getting this error.

Thanks.


From python at bdurham.com  Sun Feb 15 15:40:47 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 15:40:47 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <49987655.7020605@timgolden.me.uk>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<1234728301.16829.1300503743@webmail.messagingengine.com>
	<49987655.7020605@timgolden.me.uk>
Message-ID: <1234730447.23415.1300508497@webmail.messagingengine.com>

Tim,

> Just for the info, Malcolm, you don't actually need to assign the result of float (input) to anything if you don't need to use it. All you're looking for is the exception. Let the intepreter convert it and then throw it away.

Yes! 

> Also, as an alternative style which can be more appropriate depending on the structure and intention of what you're doing, you can use the else: clause of the try-except block.
>
> try:
>    float (input)
> except ValueError:
>    return False
> else:
>    return True

I follow the semantics, but I don't know why I would prefer the try/else
technique over the simpler:

try:
    float( input )
    return True
except ValueError:
    return False

Thank you for your feedback,

Malcolm


From steve at holdenweb.com  Sun Feb 15 15:46:01 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 15:46:01 -0500
Subject: BaseHttpServer
In-Reply-To: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
Message-ID: <gn9uue$dtj$1@ger.gmane.org>

Paul wrote:
> Hi,
> I currently have a webserver using BaseHttpServe that serves images
> like this:
> if self.path.endswith(".jpg"):
>                 print(curdir + sep + self.path)
>                 f = open(curdir + sep + self.path,"b")
>                 self.send_response(200)
>                 self.send_header('Content-type',	'image/jpg')
>                 self.end_headers()
>                 self.wfile.write(f.read())
>                 f.close()
>                 return
> Whilst it works, it does take quite a while to load (approx 10secs for
> a 4mb file even though its over the local connection) - does anyone
> have any hints/tips for speeding it up?

You could consider reading the file in smaller blocks and writing the
output in a loop. That way the next block of the file can be read in
while the network buffers are emptying.

Just keep reading data and writing it until the number of data bytes you
wrote is fewer than the number you tried to read.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rushik.upadhyay at gmail.com  Sun Feb 15 16:17:53 2009
From: rushik.upadhyay at gmail.com (rushik)
Date: Sun, 15 Feb 2009 13:17:53 -0800 (PST)
Subject: Cannot able to retreive compressed html URL
References: <ed5d8df0-0cd6-4b17-92d0-d409f2bfdbe7@f3g2000vbf.googlegroups.com>
Message-ID: <322a11e8-47b8-4b8a-b9d8-5fbb61627538@q30g2000vbn.googlegroups.com>

On Feb 15, 11:56?am, rushik <rushik.upadh... at gmail.com> wrote:
> Hi,
> I am trying to build python script which retreives and analyze the
> various URLs and generate reports.
>
> Some of the urls are like "http://xyz.com/test.html.gz", I am trying
> to retreive it using urllib2 library and then using gzip library
> trying to decompress it.
>
> ex - server_url is say -http://xyz.com/test.html.gz
>
> ? ? ? ? ? ? ? ? logpage = urllib2.urlopen(server_url)
> ? ? ? ? ? ? ? ? html_content = cal_logpage.read()
> ? ? ? ? ? ? ? ? logpage.close()
>
> ? ? ? ? ? ? ? ? gz_tmp = open("gzip.txt.gz", "w")
> ? ? ? ? ? ? ? ? gz_tmp.write(html_content)
> ? ? ? ? ? ? ? ? gz_tmp.close()
> ? ? ? ? ? ? ? ? f = gzip.open("gzip.txt.gz", "rb")
> ? ? ? ? ? ? ? ? file_content = f.read()
> ? ? ? ? ? ? ? ? f.close()
>
> ? ? ? ? ? ? ? ? #return the resulting html content.
> ? ? ? ? ? ? ? ? return html_content
>
> on executing the code, its giving
>
> zlib.error - Error -3 while decompressing: invalid distance too far
> back
>
> the same URL I am able to retreive in proper html page format from
> browser
>
> please let me know if I am doing something wrong here, or is there any
> other better way to do so.
>
> Thanks,
> R

I got the solution !! using now urllib.retrieve

thx,
R


From jason.scheirer at gmail.com  Sun Feb 15 17:04:57 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Sun, 15 Feb 2009 14:04:57 -0800 (PST)
Subject: error while importing os
References: <fc16083e-b68a-448b-9007-7321e954ef7f@i18g2000prf.googlegroups.com>
Message-ID: <cbbfe910-49ce-4bd2-a4b9-1b52f3e6d784@g1g2000pra.googlegroups.com>

On Feb 15, 12:38?pm, karan <konte... at gmail.com> wrote:
> Hi,
>
> Iam new to python i see the following when iam in the python shell and
> i try to import os,though i can import the sys and sys.path does
> contain the path to the python binary or the folder where the python
> binaries reside:
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib\os.py",
> line 683, in ?
> ? ? import copy_reg as _copy_reg
> ? File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib
> \copy_reg.py", line 7, in ?
> ? ? from types import ClassType as _ClassType
> ImportError: dynamic module does not define init function (inittypes)
>
> I have the added the path to the Python which contain the python
> binaries,DLLs to the PYTHONPATH.
>
> Let me know what might be the reason for getting this error.
>
> Thanks.

Looks like you have an errant dynamic library -- look for types.pyd on
your pythonpath and make sure the right one is getting imported.


From peter at www.pjb.com.au  Sun Feb 15 17:21:22 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 15 Feb 2009 22:21:22 GMT
Subject: Module to read/write MIDI ?
Message-ID: <slrngph5b2.2qd.peter@box8.pjb.com.au>

Greetings,

I speak as a newbie, in the sense that I've been programming Perl4&5
for fifteen years, but am checking out Python3 as an alternative to
Perl6.  So far I've translated one of my cpan modules into Python3
  http://www.pjb.com.au/comp/free/TermClui.py
  http://www.pjb.com.au/comp/free/test_script
and it basically works (the termios ioctls aren't quite what I want yet).

Another thing I'd need to proceed with Python3 is some equivalent
of Sean Burke's MIDI-Perl module:
  http://search.cpan.org/search?query=MIDI-Perl
  
I had my first look around pypi.python.org/pypi yesterday and didn't
see anything.  Is there a MIDI-module for Python ?  If not, I'll
email Sean to ask if he'd mind me translating his module into Python3...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From jcd at sdf.lonestar.org  Sun Feb 15 18:02:03 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sun, 15 Feb 2009 18:02:03 -0500
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <1234738923.721.4.camel@mctell>

On Sun, 2009-02-15 at 09:54 -0800, Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.
> 
> I was thinking if it would be useful.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

I think it would be useful to have somewhere, but I'm -1 on replacing
the official documentation with it.  I like having the official
documentation more... official.  I like that what you see there has been
fully vetted, edited, and tested.  If there's something wrong with it,
fix it.  If you've got a helpful tip, add it, but it shouldn't be as
easy as commenting to add to the official documentation.  You could
argue that the documentation itself is official, and the comments are
not, but I like not having to worry about what part of the page I'm
looking at.  I also like that google only indexes the official
documentation, and not the comments.  

As I said, it could be very helpful, and I'm not against people having a
place to share their advice, but I'd rather see it happen somewhere
besides python.org. 

Just my thought. 



From catphive at catphive.net  Sun Feb 15 18:07:06 2009
From: catphive at catphive.net (Brendan Miller)
Date: Sun, 15 Feb 2009 15:07:06 -0800
Subject: documentation link for python 3.0.1 on python.org is broken
Message-ID: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>

Like the title says.


From pauljefferson at gmail.com  Sun Feb 15 18:24:01 2009
From: pauljefferson at gmail.com (Paul)
Date: Sun, 15 Feb 2009 15:24:01 -0800 (PST)
Subject: BaseHttpServer
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
	<mailman.9589.1234730781.3487.python-list@python.org>
Message-ID: <bd2ab14b-ca1a-4d7d-9ae5-aae7d5d4cefc@a12g2000yqm.googlegroups.com>

On Feb 15, 8:46?pm, Steve Holden <st... at holdenweb.com> wrote:
> Paul wrote:
> > Hi,
> > I currently have a webserver using BaseHttpServe that serves images
> > like this:
> > if self.path.endswith(".jpg"):
> > ? ? ? ? ? ? ? ? print(curdir + sep + self.path)
> > ? ? ? ? ? ? ? ? f = open(curdir + sep + self.path,"b")
> > ? ? ? ? ? ? ? ? self.send_response(200)
> > ? ? ? ? ? ? ? ? self.send_header('Content-type', ? 'image/jpg')
> > ? ? ? ? ? ? ? ? self.end_headers()
> > ? ? ? ? ? ? ? ? self.wfile.write(f.read())
> > ? ? ? ? ? ? ? ? f.close()
> > ? ? ? ? ? ? ? ? return
> > Whilst it works, it does take quite a while to load (approx 10secs for
> > a 4mb file even though its over the local connection) - does anyone
> > have any hints/tips for speeding it up?
>
> You could consider reading the file in smaller blocks and writing the
> output in a loop. That way the next block of the file can be read in
> while the network buffers are emptying.
>
> Just keep reading data and writing it until the number of data bytes you
> wrote is fewer than the number you tried to read.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Thanks for these but they seem to have made no difference - it still
loads (visually) in chunks on the screen taking quite a while.
Intrestingly, with the looping idea I got it to print out on each loop
and some took a substantial amount of time to load compared to others
(I tried using 1500 and then 10,000 size chunks,with the code being:
            if self.path.endswith(".jpg"):
                print(curdir + sep + self.path)
                f = open(curdir + sep + self.path,"rb")
                self.send_response(200)
                self.send_header('Content-type',	'image/jpg')
                self.end_headers()
                h = 10000
                while h==10000:
                    g = f.read(10000)
                    h = len(g)
                    print h
                    self.wfile.write(g)

                #self.wfile.write(f.read())

                #shutil.copyfileobj(f,self.wfile)
                f.close()
                return

I also tried loading it to memory before it was requested but that
also made no difference.
If anyone's got any suggestions, I would be very greatful,
Paul


From greg.ewing at canterbury.ac.nz  Sun Feb 15 18:33:42 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 16 Feb 2009 12:33:42 +1300
Subject: ANN: SuPy 1.4
Message-ID: <mailman.20.1234765727.11746.python-announce-list@python.org>

SuPy 1.4 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Python tuples are converted to Ruby arrays, so you can pass them
   directly to Sketchup methods that require an array.

- 'Array' function for converting other Python sequences to arrays.

- X_AXIS, Y_AXIS, Z_AXIS constants.

- Unit conversion constants (feet, yard, etc.) e.g. 5 * feet


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From jaomatos at gmail.com  Sun Feb 15 18:36:21 2009
From: jaomatos at gmail.com (=?utf-8?q?Jos=C3=A9_Matos?=)
Date: Sun, 15 Feb 2009 23:36:21 +0000
Subject: Python is slow?
In-Reply-To: <gcbh0u$mj5$5@lust.ihug.co.nz>
References: <f905b3c6-c9da-4b7e-b698-f2a5d97e6dc6@c58g2000hsc.googlegroups.com>
	<mailman.1764.1222798473.3487.python-list@python.org>
	<gcbh0u$mj5$5@lust.ihug.co.nz>
Message-ID: <200902152336.22016.jaomatos@gmail.com>

On Monday 06 October 2008 00:01:50 Lawrence D'Oliveiro wrote:
> Not listed as one
> <http://www.fsf.org/licensing/licenses/index_html/view?searchterm=license>.

Look further
http://directory.fsf.org/project/gnuplot/

-- 
Jos? Ab?lio


From tjreedy at udel.edu  Sun Feb 15 18:39:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:39:38 -0500
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <gna93q$ae6$1@ger.gmane.org>

Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.

I presume the docs that are part of the distribution are covered by the 
rather liberal Python license, which is included with the doc set.



From tjreedy at udel.edu  Sun Feb 15 18:41:14 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:41:14 -0500
Subject: Python interface to ODF documents?
In-Reply-To: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <gna96o$ae6$2@ger.gmane.org>

Dotan Cohen wrote:
> Is there a Python interface to ODF documents? I'm thinking of
> something that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.

odf2py, probably among others.



From tjreedy at udel.edu  Sun Feb 15 18:43:36 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:43:36 -0500
Subject: documentation link for python 3.0.1 on python.org is broken
In-Reply-To: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>
References: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>
Message-ID: <gna9b6$ae6$3@ger.gmane.org>

Brendan Miller wrote:
> Like the title says.

but on which page?  in any case, inform webmaster at python.org of specific 
site problems



From mwilson at the-wire.com  Sun Feb 15 19:05:36 2009
From: mwilson at the-wire.com (Mel)
Date: Sun, 15 Feb 2009 19:05:36 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
Message-ID: <gnaak5$1nek$1@services.telesweet.net>

Christian Heimes wrote:
> Roy Smith wrote:

>> They make sense when you need to recover from any error that may occur,
>> possibly as the last resort after catching and dealing with more specific
>> exceptions. In an unattended embedded system (think Mars Rover), the
>> top-level code might well be:
>> 
>> while 1:
>>    try:
>>       main()
>>    except:
>>       reset()
> 
> Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> and SyntaxError?

Exactly.  A normal program should never do anything more comprehensive than

try:
    some_function ()
except StandardError:
    some_handling ()

IMHO

        Mel.



From Scott.Daniels at Acm.Org  Sun Feb 15 19:13:41 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 15 Feb 2009 16:13:41 -0800
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <mailman.9581.1234728304.3487.python-list@python.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>

python at bdurham.com wrote:
> Thanks for everyone's feedback....
> def isnumber( input ):
>     try:
>         num = float( input )
>         return True
> 
>     except ValueError:
>         return False

Pretty good, but what about 0x23?

     def isnumber( input ):
         try:
             num = float(input)
             return True
         except ValueError:
             try:
                 num = int(input, 0) # Convert to int, base spec in arg
                 return True
             except ValueError:
                 return False


--Scott David Daniels
Scott.Daniels at Acm.Org


From sandraqu at silverica.com  Sun Feb 15 19:24:29 2009
From: sandraqu at silverica.com (Sandra Quiles)
Date: Sun, 15 Feb 2009 19:24:29 -0500
Subject: illegal list name
Message-ID: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>


Hello. I have followed the instructions of a post on Installing  
mailman on OS X 10.4, and got to step 7 and hit this error.

The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman  
2.1.5 (using this outdated version because I don't know how to upgrade  
Python despite going to the Python site.  It wasn't obvious to me  
which Linux package was an upgrade, and the installation of MacPython  
2.6.1 was not recognized by Terminal).

So. illegal name error. it list listname as 'mailman@<mycomputername>'

that's in response to the 'bin/newlist mailman' command

also, I purchased the Postfix Enabler, but have no clue what to do  
with the software.

Tips, advise, hand-holding welcomed.

-- sandra



From vincent at vincentdavis.net  Sun Feb 15 19:29:09 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sun, 15 Feb 2009 17:29:09 -0700
Subject: Above and beyond, A critique request
Message-ID: <77e831100902151629y286badf1t5af11adac45e5940@mail.gmail.com>

So I am new to python and not much of a programmer. Mostly program using
statistical packages. I been working on a project to simulate the
medical residency match for about 2 weeks. I don't know any python
programmers so I would greatly appreciate any comment or suggestions you may
have to improve my programing skills. My program does work but I have no
comparison or experience to know if I have used "best practices". Suggestion
may be broad or specific all input is appreciated. I have
already benefited from the group and am appreciative of it.

Due to python-list at python.org limited post size I have only included the
final step. If someone is willing to review my complete program ~250 lines
it can be downloaded at http://vincentdavis.org/match

In word this is what it does.


   - Creates a population of institutions and applicants, quality and score
   are generated for each by drawing from a random dist.
   - The is an observation error, that is the institutions do not see the
   true applicant score and the applicant do not see the true institution
   quality.
   - applicants apply to institution that are near there ability
   - institutions reject if applicant is not qualified
   - applicant rank the institutions 0 best large values worse
   - institutions rank applicants
   - The Match is best described here
   http://www.nrmp.org/res_match/about_res/algorithms.html


I have a lot of print functions mostly to track what was going on during
development.

Thanks
Vincent Davis
720-301-3003

# NumApp  is the number of applicants
# NumInst  is the number of institutions
# ari  is a list of institutions rank by each applicant, [[5, 6, 2], [8, 3,
6, 2], [.........  So applicant 1 ranked institution 2 first and institution
6 second, applicant 2 ranked institution 6 third
# ira  institutions ranking of applicants same format as ari but from the
institutions perspective
# iram  is a "matrix" version of ira, rows are applicants, colums are
institutions values represent the rank, that is the rank the institution
gave the applicant
# I think that is all that is used in this part that is not defined below.


#### Starts here ####
app_match = [None]*NumApp # the list of institution each applicant is
matched to
try_list = [] # makes a copy of ari
try_list.extend(ari) # makes a copy of ari
inst_match=[[] for x in range(NumInst)] # this is a list of applicants each
Institution accepted

#get list of applicants not matched

notmatched = [x for x in range(NumApp) if (app_match[x] == None and
len(try_list[x]) > 0)]

print 'notmatched', notmatched
print 'len(notmatched)', len(notmatched)
while len(notmatched) > 0:
    for x in notmatched:
        try_inst = try_list[x][0] # try this institution
        try_rank = ari[x].index(try_inst) # try_inst is ranked --
        app_ranked = iram[x][try_inst] # this is what try_inst ranked the
applicant
        print 'Try to match Applicant', x, ' to rank', try_rank, 'at inst',
try_inst
        print 'Who is in inst', try_inst, inst_match[try_inst]
        print 'Institution', try_inst, 'ranked applicant', x, app_ranked

        ranklist = [iram[i][try_inst] for i in inst_match[try_inst]] # this
is the rank of each applicant matched to try_inst

        if len(ranklist) > 0:
            max_rank = max(ranklist) # the max rank value "lowest rank"
            max_app = inst_match[try_inst][ranklist.index(max_rank)] # the
applicant corresponding to max_rank

        if len(inst_match[try_inst]) < NumAccept : #Does the institution
have an empty spot.
            print 'Institution', try_inst, 'has an empty spot for', x
            inst_match[try_inst].append(x) # Add to institutions list
            print x, 'in now in', try_inst, 'with', inst_match[try_inst]
            app_match[x] = try_inst # assign inst to app
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) == NumAccept and app_ranked <
max_rank) :
            print 'Applicant',x , 'is ranked', app_ranked, 'which is higher
than', max_app, 'who was ranked', max_rank
            print 'so applicant', x, 'bumps', max_app

            app_match[max_app] = None
            inst_match[try_inst].remove(max_app)

            app_match[x] = try_inst
            inst_match[try_inst].append(x)
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) == NumAccept and iram[x][try_inst] >
max_rank) :
            print 'Applicant',x , 'is ranked', app_ranked, 'which is Lower
than', max_app, 'who was ranked', max_rank
            print 'therefor', x, 'does not match at', try_inst
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) > NumAccept) :
            print '#################### to many matched to institution, fix
this, some thing is broke ###################'

        else:
            print '#################### fix this, some thing is broke
###################'

    print 'finished with applicant', x

    notmatched = [x for x in range(NumApp) if (app_match[x] == None and
len(try_list[x]) > 0)]
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From vincent at vincentdavis.net  Sun Feb 15 19:39:06 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sun, 15 Feb 2009 17:39:06 -0700
Subject: illegal list name
In-Reply-To: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>
References: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>
Message-ID: <77e831100902151639l4c4d3a1fu3f5f40cadff539ed@mail.gmail.com>

You probably have got 2.6 installed you just need to tell terminal to use
2.6, there should be a shell command inside the 2.6 folder that updates the
terminal to use 2.6 otherwise you start python by referring directly to the
"python" you need to use. Sorry I have no advise on mailman.

Thanks
Vincent Davis



On Sun, Feb 15, 2009 at 5:24 PM, Sandra Quiles <sandraqu at silverica.com>wrote:

>
> Hello. I have followed the instructions of a post on Installing mailman on
> OS X 10.4, and got to step 7 and hit this error.
>
> The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman
> 2.1.5 (using this outdated version because I don't know how to upgrade
> Python despite going to the Python site.  It wasn't obvious to me which
> Linux package was an upgrade, and the installation of MacPython 2.6.1 was
> not recognized by Terminal).
>
> So. illegal name error. it list listname as 'mailman@<mycomputername>'
>
> that's in response to the 'bin/newlist mailman' command
>
> also, I purchased the Postfix Enabler, but have no clue what to do with the
> software.
>
> Tips, advise, hand-holding welcomed.
>
> -- sandra
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From philip at semanchuk.com  Sun Feb 15 20:35:17 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 15 Feb 2009 20:35:17 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <gn9mr3$kp5$2@ger.gmane.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
Message-ID: <F0659E07-B521-433B-8A54-C98A677F8CBD@semanchuk.com>


On Feb 15, 2009, at 1:27 PM, Christian Heimes wrote:

> Philip Semanchuk schrieb:
>>
>> On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
>>
>>> What's the Pythonic way to determine if a string is a number? By
>>> number I mean a valid integer or float.
>>
>>
>> try:
>>   int(number)
>>   is_an_int = True
>> except:
>>   is_an_int = False
>
> Please don't teach new Python developers to use bare excepts.

Good point; my example is lazy.

I should know better as I myself got burned on bare excepts a few  
times when I started with Python. 


From sjmachin at lexicon.net  Sun Feb 15 20:37:19 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 15 Feb 2009 17:37:19 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org> 
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>

On Feb 16, 7:05?am, pyt... at bdurham.com wrote:
> Thanks for everyone's feedback. I believe my original post's code
> (updated following my signature) was in line with this list's feedback.
>
> Christian: Thanks for reminding me about exponential formats. My updated
> code accounts for these type of numbers. I don't need to handle inf or
> nan values. My original code's except catches an explicit ValueError
> exception per your concern about bare excepts.
>
> Malcolm
>
> <code>
> # str_to_num.py
>
> def isnumber( input ):
> ? ? try:
> ? ? ? ? num = float( input )
> ? ? ? ? return True
>
> ? ? except ValueError:
> ? ? ? ? return False
>
> if __name__ == '__main__':
> ? ? tests = """
> ? ? ? ? 12
> ? ? ? ? -12
> ? ? ? ? -12.34
> ? ? ? ? .0
> ? ? ? ? .
> ? ? ? ? 1 2 3
> ? ? ? ? 1 . 2
>
> ? ? ? ? 1e10
> ? ? ? ? 1E10
> ? ? ? ? inf
> ? ? ? ? nan
>
> ? ? ? ? 12 and text
> ? ? ? ? just text
> ? ? """
>
> ? ? for test in tests.split( '\n' ):
> ? ? ? ? print 'test (%0s), isnumber: %1s' % ( test.strip(), isnumber(
> ? ? ? ? test ) )
> </code>

Do you care about numbers that are representable as an int, but are
treated as inf by float()?

For example:
| >>> s = '1' * 310
| >>> float(s)
| inf
| >>> a = int(s)
| >>> # OK


From roy at panix.com  Sun Feb 15 21:35:20 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 21:35:20 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
Message-ID: <roy-7680F2.21352015022009@news.panix.com>

In article <gnaak5$1nek$1 at services.telesweet.net>,
 Mel <mwilson at the-wire.com> wrote:

> Christian Heimes wrote:
> > Roy Smith wrote:
> 
> >> They make sense when you need to recover from any error that may occur,
> >> possibly as the last resort after catching and dealing with more specific
> >> exceptions. In an unattended embedded system (think Mars Rover), the
> >> top-level code might well be:
> >> 
> >> while 1:
> >>    try:
> >>       main()
> >>    except:
> >>       reset()
> > 
> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> > and SyntaxError?

Absolutely.  Let's take my example -- you're writing software for a Mars 
Rover.  I have no idea how you might get a MemoryError, but let's say you 
do.  Which would you rather do, perform a system reset, or print a stack 
trace and wait for a friendly Martian to come along and reboot you?

You may think I'm being silly, but I'm dead serious.  The many layers of 
"It's impossible for this to happen, but if it does let's do something to 
try and recover" processing saved that mission several times over.  In some 
applications, there's no such thing as "halt".


From basu at archlinux.us  Sun Feb 15 21:36:44 2009
From: basu at archlinux.us (member Basu)
Date: Sun, 15 Feb 2009 21:36:44 -0500
Subject: Display a list using PyQt
Message-ID: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>

I'm writing an application with PyQt as the GUI toolkit. I have a function
that returns a simple list and I would like to update a List View widget
with it. However I can't get it to work. I'm not sure if I need to subclass
one of the Model classes, because it is just a list. Can someone point me to
a simple tutorial or give me instructions on how to go about doing this?
Thanks,
Basu
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From bedouglas at earthlink.net  Sun Feb 15 21:58:49 2009
From: bedouglas at earthlink.net (bruce)
Date: Sun, 15 Feb 2009 18:58:49 -0800
Subject: testing xml against xpather with firefox
Message-ID: <41de01c98fe2$8e8bb070$0301a8c0@tmesa.com>

hi...

got a short test against a website, and i'm using xpath (libxml2dom) in
order to extract the data. in order to create the xpath function/query, i
display the page in firefox, and use DOM/Xpather to get the xpath. i'm then
attempting to implement the xpath in my test python script.

my issue is that the xpath that appears to work in the XPather app, doesn't
give me the same results in my test python script.

my test app is below. it iterates through the list of rows in the tbl, and
for each row, it's supposed to count (and then process) the number of the
direct child "td" elements for the "tr". the xpath in XPather does this as
expected. my test app doesn't...

i can include the actual content from the page if needed. i'm including the
test script, and the output of the test...

any thoughts would be greatly appreciated...

the XPather function works as expected.

i've posted all the code/output/XPather xpath to pastebin to save space.. i
can send everything i have to whoever can help!!

http://pastebin.com/m26acf804


thanks!

-bruce



From nad at acm.org  Sun Feb 15 22:15:17 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 15 Feb 2009 19:15:17 -0800
Subject: RELEASED Python 3.0.1
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <nad-2D157E.19151715022009@news.gmane.org>

In article 
<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe at mail.gmail.com>,
 Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
> Any chance of getting a Mac installer for this one?

BTW, I see the a link to the OS X installer has now been added to the 
3.0.1 release page:
   <http://www.python.org/download/releases/3.0.1/>

It would be great if someone could add OS X links for the 3.0.1 and 
2.6.1 to the main download page, too:
   <http://www.python.org/download/>

-- 
 Ned Deily,
 nad at acm.org



From grante at visi.com  Sun Feb 15 23:49:31 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 15 Feb 2009 22:49:31 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
	<49972cf5$0$1612$742ec2ed@news.sonic.net>
	<499858c5$0$1618$742ec2ed@news.sonic.net>
Message-ID: <PrCdndkfF73GbQXUnZ2dnUVZ_rvinZ2d@posted.usinternet>

On 2009-02-15, John Nagle <nagle at animats.com> wrote:

> Linux support for nonstandard baud rates is possible, but
> needs a call to "setserial",

Or use of a non-POSIX ioctl() call.

> which is not standard POSIX.

True -- there is no way to do non-standard baud rates using
just POSIX calls.

-- 
Grant



From python at bdurham.com  Mon Feb 16 00:17:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:17:37 -0500
Subject: Pythonic way to determine if one char of many in a string
Message-ID: <1234761457.20683.1300568627@webmail.messagingengine.com>

I need to test strings to determine if one of a list of chars is
in the string. A simple example would be to test strings to
determine if they have a vowel (aeiouAEIOU) present.
I was hopeful that there was a built-in method that operated
similar to startswith where I could pass a tuple of chars to be
tested, but I could not find such a method.
Which of the following techniques is most Pythonic or are there
better ways to perform this type of match?
# long and hard coded but short circuits as soon as match found
if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
... :
-OR-
# flexible, but no short circuit on first match
if [ char for char in word if char in 'aeiouAEIOU' ]:
-OR-
# flexible, but no short circuit on first match
if set( word ).intersection( 'aeiouAEIOU' ):
Thank you,
Malcolm
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From python at bdurham.com  Mon Feb 16 00:28:39 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:28:39 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
	<5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>
Message-ID: <1234762119.22230.1300571397@webmail.messagingengine.com>

Scott,

> Pretty good, but what about 0x23?
> 
<snipped>
> num = int(input, 0) # Convert to int, base spec in arg
>

Very nice! I wasn't familiar with the use of 0 as a radix value. A quick
visit back to the documentation and I'm an enlightened man :)

Thanks for your feedback,

Malcolm


From Nicolas.Dandrimont at crans.org  Mon Feb 16 00:28:46 2009
From: Nicolas.Dandrimont at crans.org (Nicolas Dandrimont)
Date: Mon, 16 Feb 2009 00:28:46 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234761457.20683.1300568627@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
Message-ID: <20090216052846.GA12723@dirichlet.crans.org>

* python at bdurham.com <python at bdurham.com> [2009-02-16 00:17:37 -0500]:

> I need to test strings to determine if one of a list of chars is
> in the string. A simple example would be to test strings to
> determine if they have a vowel (aeiouAEIOU) present.
> I was hopeful that there was a built-in method that operated
> similar to startswith where I could pass a tuple of chars to be
> tested, but I could not find such a method.
> Which of the following techniques is most Pythonic or are there
> better ways to perform this type of match?
> # long and hard coded but short circuits as soon as match found
> if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
> ... :
> -OR-
> # flexible, but no short circuit on first match
> if [ char for char in word if char in 'aeiouAEIOU' ]:
> -OR-
> # flexible, but no short circuit on first match
> if set( word ).intersection( 'aeiouAEIOU' ):

I would go for something like:

for char in word:
    if char in 'aeiouAEIUO':
        char_found = True
        break
else:
    char_found = False

(No, I did not forget to indent the else statement, see
http://docs.python.org/reference/compound_stmts.html#for)

It is clear (imo), and it is seems to be the intended idiom for a search
loop, that short-circuits as soon as a match is found.

Cheers,
-- 
Nicolas Dandrimont

linux: the choice of a GNU generation
(ksh at cis.ufl.edu put this on Tshirts in '93)
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From python at bdurham.com  Mon Feb 16 00:37:22 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:37:22 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
	<6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>
Message-ID: <1234762642.23958.1300571929@webmail.messagingengine.com>

John,

> Do you care about numbers that are representable as an int, but are treated as inf by float()?
> 
> For example:
> | >>> s = '1' * 310
> | >>> float(s)
> | inf
> | >>> a = int(s)
> | >>> # OK

My code range checks all numbers once they've been parsed, so I don't
believe this will be a problem for me.

However, I appreciate you pointing out this behavior because I was
unaware of this subtle nuance. I'll make sure to add this to our code
review checklist.

Thanks for your feedback,

Malcolm


From python at bdurham.com  Mon Feb 16 00:48:34 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:48:34 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <20090216052846.GA12723@dirichlet.crans.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
Message-ID: <1234763314.25586.1300573535@webmail.messagingengine.com>

Nicolas,

> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
>
> It is clear (imo), and it is seems to be the intended idiom for a 
> search loop, that short-circuits as soon as a match is found.

Thank you - that looks much better that my overly complicated attempts.

Are there any reasons why I couldn't simplify your approach as follows?

for char in word:
    if char in 'aeiouAEIUO':
        return True
return False

Cheers,
Malcolm


From clp2 at rebertia.com  Mon Feb 16 00:56:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 15 Feb 2009 21:56:00 -0800
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234761457.20683.1300568627@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
Message-ID: <50697b2c0902152156n6ef16a8ao36a71e362120308f@mail.gmail.com>

On Sun, Feb 15, 2009 at 9:17 PM,  <python at bdurham.com> wrote:
> I need to test strings to determine if one of a list of chars is in the
> string. A simple example would be to test strings to determine if they have
> a vowel (aeiouAEIOU) present.
>
> I was hopeful that there was a built-in method that operated similar to
> startswith where I could pass a tuple of chars to be tested, but I could not
> find such a method.
>
> Which of the following techniques is most Pythonic or are there better ways
> to perform this type of match?
>
> # long and hard coded but short circuits as soon as match found
> if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> -OR-
>
> # flexible, but no short circuit on first match
> if [ char for char in word if char in 'aeiouAEIOU' ]:

Just use the fairly new builtin function any() to make it short-circuit:

if any(char.lower() in 'aeiou' for char in word):
    do_whatever()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From michele.simionato at gmail.com  Mon Feb 16 01:12:32 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sun, 15 Feb 2009 22:12:32 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>
Message-ID: <1cfad349-033c-49a0-b9ad-213814638567@t13g2000yqc.googlegroups.com>

On Feb 14, 3:27?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> I should probably raise a clearer error message.

Ok, I have uploaded version 3.0.1 of the decorator module,
which raises a more meaningful message in case you try to
decorate a method incorrectly. I have also added a
discussion of that case in the "caveats" session.
HTH,

                   M. Simionato


From laplacian42 at gmail.com  Mon Feb 16 01:25:39 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Sun, 15 Feb 2009 22:25:39 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
Message-ID: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>

I think I just found the GUI toolkit for Python I've been searching
for. It seems to meet all of the following requirements:

  * free software
  * small (I don't need batteries -- Python already comes with those.)
  * easy to use
  * actively maintained
  * cross-platform
  * easy to install
  * based on a stable and actively-maintained C library
  * does not depend on an external scripting language (for example,
Tcl)
  * well-documented
  * not too many dependencies
  * can easily integrate with PyOpenGL
  * support for accessibility

and it's also written in Python.

I have no idea how it's stayed under the radar in the Python community
for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
gui.html). The C library it depends upon? [SDL](http://
www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).

The sf project page is <http://sourceforge.net/projects/ocemp/>.

Installation only requires getting SDL installed, then PyGame, and
then a `sudo python setup.py install` for OcempGUI. `cd` into its `doc/
examples` directory and run a few of the examples (ex. `python
hello_world.py`).

The part of [the manual](http://ocemp.sourceforge.net/manual/ocempgui-
manual.html) that seems most like a beginner tutorial is <http://
ocemp.sourceforge.net/manual/gui_applications.html>.


From matzke at berkeley.edu  Mon Feb 16 01:44:11 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Sun, 15 Feb 2009 22:44:11 -0800
Subject: hist without plotting
Message-ID: <49990B3B.5070002@berkeley.edu>

Hi,

Is there a way to run the numpy hist function or something similar and 
get the outputs (bins, bar heights) without actually producing the plot 
on the screen?

(R has a plot = false option, something like this is what I'm looking 
for...)

Cheers!
Nick


-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From tino at wildenhain.de  Mon Feb 16 02:01:39 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:01:39 +0100
Subject: hist without plotting
In-Reply-To: <49990B3B.5070002@berkeley.edu>
References: <49990B3B.5070002@berkeley.edu>
Message-ID: <49990F53.80709@wildenhain.de>

Nick Matzke wrote:
> Hi,
> 
> Is there a way to run the numpy hist function or something similar and 
> get the outputs (bins, bar heights) without actually producing the plot 
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking 
> for...)

something like scipy.histogram(a) ?

Actually I don't see many plotting functions beside plot()
anyway...

Regards
Tino
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From timr at probo.com  Mon Feb 16 02:04:38 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 15 Feb 2009 23:04:38 -0800
Subject: illegal list name
References: <mailman.6.1234743905.11746.python-list@python.org>
Message-ID: <bq3ip4la2br76i9osmhorh9af7njesuang@4ax.com>

Sandra Quiles <sandraqu at silverica.com> wrote:
>
>Hello. I have followed the instructions of a post on Installing  
>mailman on OS X 10.4, and got to step 7 and hit this error.
>
>The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman  
>2.1.5 (using this outdated version because I don't know how to upgrade  
>Python despite going to the Python site.  It wasn't obvious to me  
>which Linux package was an upgrade, and the installation of MacPython  
>2.6.1 was not recognized by Terminal).
>
>So. illegal name error. it list listname as 'mailman@<mycomputername>'
>
>that's in response to the 'bin/newlist mailman' command

Did you read ANY of the documentation?  Such as, for example, the part
where it tells you that Mailman creates a special, hidden mailing list
called "mailman"?

In any case, the name of a mailing list should have some tenuous
relationship to exactly what the list is for.  Your name has no such
relationship.

>also, I purchased the Postfix Enabler, but have no clue what to do  
>with the software.
>
>Tips, advise, hand-holding welcomed.

I'm sorry to be crude, but if you expect to be in the habit of purchasing
software when you have no clue what to do with it, my best advice is that
you should stop purchasing software.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From pythonnutter at gmail.com  Mon Feb 16 02:04:54 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:04:54 +1100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>

Type casting seems to be the wrong way to go about this.

teststring = '15719'
teststring.isdigit()
returns True

That takes care of integers.

from string import digits
digits
'0123456789'

now you have all the digits and you can do set testing in your logic
to see if the teststring has anything in digits

A dumb way to test is alphanumeric

teststring2 = '105.22'
teststring2.isalnum()
returns True

now you can go on from there and test to further to eliminate
'abcd385laf8' which on alnum() also returns true.

Have fun,
Cheers,
PN


2009/2/16  <python at bdurham.com>:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
>
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
>
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
>
> Thanks,
> Malcolm
>
> <code>
> def isnumber( input ):
>    try:
>        if '.' in input:
>            num = float( input )
>        else:
>            num = int( input )
>        return True
>
>    except ValueError:
>        return False
>
> if __name__ == '__main__':
>    tests = """
>        12
>        -12
>        -12.34
>        .0
>        .
>        1 2 3
>        1 . 2
>        just text
>    """
>
>    for test in tests.split( '\n' ):
>        print 'test (%0s), isnumber: %1s' % \
>          ( test.strip(), isnumber( test ) )
>
> </code>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From pythonnutter at gmail.com  Mon Feb 16 02:09:00 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:09:00 +1100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
Message-ID: <af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>

silly me, forgot to mention

build a set from digits + '.' and use that for testing.

Cheers,
PN


2009/2/16 Python Nutter <pythonnutter at gmail.com>:
> Type casting seems to be the wrong way to go about this.
>
> teststring = '15719'
> teststring.isdigit()
> returns True
>
> That takes care of integers.
>
> from string import digits
> digits
> '0123456789'
>
> now you have all the digits and you can do set testing in your logic
> to see if the teststring has anything in digits
>
> A dumb way to test is alphanumeric
>
> teststring2 = '105.22'
> teststring2.isalnum()
> returns True
>
> now you can go on from there and test to further to eliminate
> 'abcd385laf8' which on alnum() also returns true.
>
> Have fun,
> Cheers,
> PN
>
>
> 2009/2/16  <python at bdurham.com>:
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
>>
>> I searched the string and cMath libraries for a similar function
>> without success. I can think of at least 3 or 4 ways to build my
>> own function.
>>
>> Here's what I came up with as a proof-of-concept. Are there
>> 'better' ways to perform this type of test?
>>
>> Thanks,
>> Malcolm
>>
>> <code>
>> def isnumber( input ):
>>    try:
>>        if '.' in input:
>>            num = float( input )
>>        else:
>>            num = int( input )
>>        return True
>>
>>    except ValueError:
>>        return False
>>
>> if __name__ == '__main__':
>>    tests = """
>>        12
>>        -12
>>        -12.34
>>        .0
>>        .
>>        1 2 3
>>        1 . 2
>>        just text
>>    """
>>
>>    for test in tests.split( '\n' ):
>>        print 'test (%0s), isnumber: %1s' % \
>>          ( test.strip(), isnumber( test ) )
>>
>> </code>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>


From tino at wildenhain.de  Mon Feb 16 02:14:33 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:14:33 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
Message-ID: <49991259.60305@wildenhain.de>

Python Nutter wrote:
> Type casting seems to be the wrong way to go about this.
> 
> teststring = '15719'
> teststring.isdigit()
> returns True

Actually its instantiating not type casting and it works
by using the type's actual description of the data it
accepts. This looks pretty good approach instead of trying
to copy (incomplete as it has been shown not only digits and
. constitute a float) already implemented code.

Of course if you want to limit the range of accepted data
even more, then isdigit and friends can be used -
maybe you could time both approaches with a set of data.

Regards
Tino
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From tino at wildenhain.de  Mon Feb 16 02:18:42 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:18:42 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-7680F2.21352015022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>	<roy-24DB5B.14011215022009@news.panix.com>	<mailman.9582.1234728315.3487.python-list@python.org>	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
Message-ID: <49991352.1050801@wildenhain.de>

Roy Smith wrote:
> In article <gnaak5$1nek$1 at services.telesweet.net>,
>  Mel <mwilson at the-wire.com> wrote:
> 
>> Christian Heimes wrote:
>>> Roy Smith wrote:
>>>> They make sense when you need to recover from any error that may occur,
>>>> possibly as the last resort after catching and dealing with more specific
>>>> exceptions. In an unattended embedded system (think Mars Rover), the
>>>> top-level code might well be:
>>>>
>>>> while 1:
>>>>    try:
>>>>       main()
>>>>    except:
>>>>       reset()
>>> Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
>>> and SyntaxError?
> 
> Absolutely.  Let's take my example -- you're writing software for a Mars 
> Rover.  I have no idea how you might get a MemoryError, but let's say you 
> do.  Which would you rather do, perform a system reset, or print a stack 
> trace and wait for a friendly Martian to come along and reboot you?
> 
> You may think I'm being silly, but I'm dead serious.  The many layers of 
> "It's impossible for this to happen, but if it does let's do something to 
> try and recover" processing saved that mission several times over.  In some 
> applications, there's no such thing as "halt".

Yeah, having your mars rower forever running in a loop to try to convert
some random string to a number is sure something you want to achieve.

Tino
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From odeits at gmail.com  Mon Feb 16 02:18:50 2009
From: odeits at gmail.com (odeits)
Date: Sun, 15 Feb 2009 23:18:50 -0800 (PST)
Subject: Changing the Image on a button
Message-ID: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>

I want to be able to toggle if the button has an image or text. For
some reason the following code gets the button to have an image but
when i push the button i expect the image to go away but it does not.
Am I missing something?

from Tkinter import *


def do():
    btn.configure(image = None)

root = Tk()
img1 = PhotoImage(file="bacon.gif")

btn = Button(image = img1, command = do, text = "hello" )
btn.img = img1
btn.pack()
root.mainloop()


From odeits at gmail.com  Mon Feb 16 02:31:42 2009
From: odeits at gmail.com (odeits)
Date: Sun, 15 Feb 2009 23:31:42 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
Message-ID: <8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>

On Feb 15, 9:56?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sun, Feb 15, 2009 at 9:17 PM, ?<pyt... at bdurham.com> wrote:
> > I need to test strings to determine if one of a list of chars is in the
> > string. A simple example would be to test strings to determine if they have
> > a vowel (aeiouAEIOU) present.
>
> > I was hopeful that there was a built-in method that operated similar to
> > startswith where I could pass a tuple of chars to be tested, but I could not
> > find such a method.
>
> > Which of the following techniques is most Pythonic or are there better ways
> > to perform this type of match?
>
> > # long and hard coded but short circuits as soon as match found
> > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> > -OR-
>
> > # flexible, but no short circuit on first match
> > if [ char for char in word if char in 'aeiouAEIOU' ]:
>
> Just use the fairly new builtin function any() to make it short-circuit:
>
> if any(char.lower() in 'aeiou' for char in word):
> ? ? do_whatever()
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

If you want to generalize it you should look at sets
http://docs.python.org/library/sets.html

It seems what you are actually testing for is if the intersection of
the two sets is not empty where the first set is the characters in
your word and the second set is the characters in your defined string.



From pythonnutter at gmail.com  Mon Feb 16 02:34:55 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:34:55 +1100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
Message-ID: <af90b3410902152334p73fe32ccrcc1d7505ddcc9a24@mail.gmail.com>

Had a look and it is still under my radar unfortunately because of
TkInter. OceanGUI has a lot of large decencies (Pygame, SDL libraries,
PyObjC, etc.) to install on my system to just to get a GUI thats no
better loking than TkInter which comes pre-installed (no dependencies)
on most every major platform.

If I was writing a game I might be interested, but I'd want to do some
serious skinning of that GUI to make it look better.

For applications installing the full wxWidgets or Qt toolkits would be
less disk space and dependcies than OceanGUI and performance would
probably be higher. TkInter also has many skins/themes you can add
that makes it rather, although not 100% native looking on target
systems.

For example, check out
http://tclmacbag.autons.net/screenshots.phtml

For 86K download/dependencies I can get a rather Mac looking GUI.

Cheers,
PN


2009/2/16  <laplacian42 at gmail.com>:
> I think I just found the GUI toolkit for Python I've been searching
> for. It seems to meet all of the following requirements:
>
>  * free software
>  * small (I don't need batteries -- Python already comes with those.)
>  * easy to use
>  * actively maintained
>  * cross-platform
>  * easy to install
>  * based on a stable and actively-maintained C library
>  * does not depend on an external scripting language (for example,
> Tcl)
>  * well-documented
>  * not too many dependencies
>  * can easily integrate with PyOpenGL
>  * support for accessibility
>
> and it's also written in Python.
>
> I have no idea how it's stayed under the radar in the Python community
> for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
> gui.html). The C library it depends upon? [SDL](http://
> www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).
>
> The sf project page is <http://sourceforge.net/projects/ocemp/>.
>
> Installation only requires getting SDL installed, then PyGame, and
> then a `sudo python setup.py install` for OcempGUI. `cd` into its `doc/
> examples` directory and run a few of the examples (ex. `python
> hello_world.py`).
>
> The part of [the manual](http://ocemp.sourceforge.net/manual/ocempgui-
> manual.html) that seems most like a beginner tutorial is <http://
> ocemp.sourceforge.net/manual/gui_applications.html>.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From matzke at berkeley.edu  Mon Feb 16 02:54:25 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Sun, 15 Feb 2009 23:54:25 -0800
Subject: hist without plotting
In-Reply-To: <49990B3B.5070002@berkeley.edu>
References: <49990B3B.5070002@berkeley.edu>
Message-ID: <49991BB1.7060903@berkeley.edu>

Nevermind, I was running the pylab hist; the numpy.histogram function 
generates the bar counts etc. without plotting the histogram.

Cheers!
Nick

Nick Matzke wrote:
> Hi,
> 
> Is there a way to run the numpy hist function or something similar and 
> get the outputs (bins, bar heights) without actually producing the plot 
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking 
> for...)
> 
> Cheers!
> Nick
> 
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From __peter__ at web.de  Mon Feb 16 02:56:14 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 16 Feb 2009 08:56:14 +0100
Subject: hist without plotting
References: <mailman.21.1234766750.11746.python-list@python.org>
Message-ID: <gnb66v$4r3$00$1@news.t-online.com>

Nick Matzke wrote:

> Is there a way to run the numpy hist function or something similar and
> get the outputs (bins, bar heights) without actually producing the plot
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking
> for...)

First hit googling for numpy hist led me to

http://www.scipy.org/Tentative_NumPy_Tutorial#head-aa75ec76530ff51a2e98071adb7224a4b793519e

So pylab.hist() plots and numpy.histogram() just calculates.

Peter


From gh at ghaering.de  Mon Feb 16 03:28:41 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 16 Feb 2009 09:28:41 +0100
Subject: Display a list using PyQt
In-Reply-To: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>
References: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>
Message-ID: <gnb83l$81c$1@ger.gmane.org>

member Basu wrote:
> I'm writing an application with PyQt as the GUI toolkit. I have a
> function that returns a simple list and I would like to update a List
> View widget with it. However I can't get it to work. I'm not sure if I
> need to subclass one of the Model classes, because it is just a list.
> Can someone point me to a simple tutorial or give me instructions on how
> to go about doing this?

The attached example should help. Also see the examples included with PyQt.

-- Gerhard
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From loveshadowdog at yahoo.com  Mon Feb 16 03:46:40 2009
From: loveshadowdog at yahoo.com (loveshadowdog at yahoo.com)
Date: Mon, 16 Feb 2009 00:46:40 -0800 (PST)
Subject: Windows vista
Message-ID: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>

Hi. My name is toru.
I start learning python couple weeks ago.

I install the compiler from python.org.
but I cannot use the IDLE program.
(command line works fine so far)
the error screen says that the my personal fire wall is blocking the
program to run.
I am not sure how to fix this.
By the way, I heard many people said that this is because I am using
windows vista.
Does anyone know how to use IDLE program on Windows Vista machine?

thank you.


From rushenaly at gmail.com  Mon Feb 16 04:34:34 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 01:34:34 -0800 (PST)
Subject: Will multithreading make python less popular?
Message-ID: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>

Hi everybody,
I am an engineer. I am trying to improve my software development
abilities. I have started programming with ruby. I like it very much
but i want to add something more. According to my previous research i
have designed a learning path for myself. It's like something below.
      1. Ruby (Mastering as much as possible)
      2. Python (Mastering as much as possible)
      3. Basic C++ or Basic Java
And the story begins here. As i search on the net,  I have found that
because of the natural characteristics of python such as GIL, we are
not able to write multi threaded programs. Oooops, in a kind of time
with lots of cpu cores and we are not able to write multi threaded
programs. That is out of fashion. How a such powerful language doesn't
support multi threading. That is a big minus for python. But there is
something interesting, something like multi processing. But is it a
real alternative for multi threading. As i searched it is not, it
requires heavy hardware requirements (lots of memory, lots of cpu
power). Also it is not easy to implement, too much extra code...

After all of that, i start to think about omiting python from my
carrier path and directly choosing c++ or java. But i know google or
youtube uses python very much. How can they choose a language which
will be killed by multi threading a time in near future. I like python
and its syntax, its flexibility.

What do you think about multi threading and its effect on python. Why
does python have such a break and what is the fix. Is it worth to make
investment of time and money to a language it can not take advantage
of multi cores?

Thank you...
Rushen


From zhangyunfan2 at gmail.com  Mon Feb 16 04:39:01 2009
From: zhangyunfan2 at gmail.com (vimuser)
Date: Mon, 16 Feb 2009 01:39:01 -0800 (PST)
Subject: How to enum all the users from a windows domain via python win32net 
	module?
Message-ID: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>

I tried the command "net user /DOMAIN" in windows console(cmd.exe),
and it showed me all the usernames in my domain without any problems.
But when I tried it in python with these commands :
info=win32net.NetUserEnum("DOMAIN_NAME",1),
info=win32net.NetUserEnum(r"\\DOMAIN_NAME",1),and
info=win32net.NetUserEnum("\\\\DOMAIN_NAME",1), I all got the System
Error 53 (The network path was not found) .

What should I do, if I intend to enum all the users from a windows
domain via python win32net module?


From mail at timgolden.me.uk  Mon Feb 16 05:00:54 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 16 Feb 2009 10:00:54 +0000
Subject: How to enum all the users from a windows domain via python
	win32net module?
In-Reply-To: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>
References: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>
Message-ID: <49993956.8080100@timgolden.me.uk>

vimuser wrote:
> I tried the command "net user /DOMAIN" in windows console(cmd.exe),
> and it showed me all the usernames in my domain without any problems.
> But when I tried it in python with these commands :
> info=win32net.NetUserEnum("DOMAIN_NAME",1),
> info=win32net.NetUserEnum(r"\\DOMAIN_NAME",1),and
> info=win32net.NetUserEnum("\\\\DOMAIN_NAME",1), I all got the System
> Error 53 (The network path was not found) .
> 
> What should I do, if I intend to enum all the users from a windows
> domain via python win32net module?
> --
> http://mail.python.org/mailman/listinfo/python-list

<code>

import win32net
import win32netcon

dc = win32net.NetGetAnyDCName (None, None)

resume = 0
while 1:
  (_users, total, resume) = \
    win32net.NetUserEnum (
      dc,
      3,
      win32netcon.FILTER_NORMAL_ACCOUNT,
      resume,
      win32netcon.MAX_PREFERRED_LENGTH
    )
  for _user in _users:
    print _user['name'], _user['home_dir'], _user['profile']
  break
  if not resume:
    break


</code>

TJG


From mail at timgolden.me.uk  Mon Feb 16 05:03:02 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 16 Feb 2009 10:03:02 +0000
Subject: [Fwd: Re: Pythonic way to determine if a string is a number]
Message-ID: <499939D6.5060405@timgolden.me.uk>

[Resending after a bounce from mailing list]

python at bdurham.com wrote:
>> try:
>>    float (input)
>> except ValueError:
>>    return False
>> else:
>>    return True
> 
> I follow the semantics, but I don't know why I would prefer the try/else
> technique over the simpler:
> 
> try:
>     float( input )
>     return True
> except ValueError:
>     return False


In this case, I don't think you would. At least I would
say it's no more than 50/50 depending on taste and probably
more like 60/40 in favour of your solution. However
there are situations where try-except-else more 
naturally expresses the code intent. Of course I
can't think of a single one now, and it's not an easy
thing to search my codebase for so I'll just press send
and then think of an example two seconds later!

Really wanted to make sure you were aware of it as an
option; the else clause on try-except (and its cousin
the for-else clause) are easily overlooked / forgotten.

TJG



From kaiser.vocote at gmail.com  Mon Feb 16 05:06:52 2009
From: kaiser.vocote at gmail.com (Andreas Kaiser)
Date: Mon, 16 Feb 2009 02:06:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <47deb5f1-bfae-439d-8239-c6c824a531a3@f20g2000yqg.googlegroups.com>

On 16 Feb., 10:34, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python.

On comp.lang.ruby David Masover wrote this at 29 Jul. 2008, 07:55:
-----
Right now, Ruby shares a problem with Python called the GIL -- the
Global (or
Giant) Interpreter Lock. What this means is that only one Ruby
instruction
may execute at a time. So even though they're using separate OS
threads, and
even though different Ruby threads might run on different cores, the
speed of
your program (at least the Ruby part) is limited to the speed of a
single
core.
-----

Please don't mix threads and parallel processing on more then one CPU
core.

Andreas


From alexionne at gmail.com  Mon Feb 16 05:10:46 2009
From: alexionne at gmail.com (Aleksa Todorovic)
Date: Mon, 16 Feb 2009 11:10:46 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <74e474ac0902160210t591d82d5qd03e0a538671bc0a@mail.gmail.com>

Hi, Rushen!

I'm also new to using Python but from what I've found, GIL is very
intentional decision. It is one of the features of Python which make
it so powerful. I believe that if it didn't have GIL, Python wouldn't
be half near where it is now (regarding it as a language, community,
platform support, popularity, ...).

The most important question is do you really need multi-threading for
what you do? There is lot of software which doesn't require mt at all,
or could be written without mt. Also, if you haven't learnt C++ or
Java yet, mt is not something you should be worried about in the near
future - there are lot of other, more important things, you need to
learn before opening door mt hell :-)

Best,
Aleksa


On Mon, Feb 16, 2009 at 10:34,  <rushenaly at gmail.com> wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>      1. Ruby (Mastering as much as possible)
>      2. Python (Mastering as much as possible)
>      3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...
>
> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?
>
> Thank you...
> Rushen
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Aleksa Todorovic - Lead Programmer
Eipix Entertainment
http://www.eipix.com/


From si.422a at yahoo.com  Mon Feb 16 05:16:51 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Mon, 16 Feb 2009 02:16:51 -0800 (PST)
Subject: explain
Message-ID: <654311.52341.qm@web111202.mail.gq1.yahoo.com>

I download python 2.5.4 and install but I dont know that how perform python?
I dont know from which directory perform python?
Please explain for me.
Thank you


      
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From si.422a at yahoo.com  Mon Feb 16 05:24:13 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Mon, 16 Feb 2009 02:24:13 -0800 (PST)
Subject: explain
Message-ID: <255795.88503.qm@web111210.mail.gq1.yahoo.com>

I download python 2.5.4 and install but I dont know that how run python?
I dont know from which directory run python?
Please explain for me.
Thank you


      
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From asmodai at in-nomine.org  Mon Feb 16 05:26:13 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 16 Feb 2009 11:26:13 +0100
Subject: explain
In-Reply-To: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
References: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
Message-ID: <20090216102613.GE39358@nexus.in-nomine.org>

-On [20090216 11:17], Saeed Iravani (si.422a at yahoo.com) wrote:
>I download python 2.5.4 and install but I dont know that how perform python?
>I dont know from which directory perform python?

It would help if you would clarify which operating system you are using.

On Unix/Linux systems you make sure to 'rehash' your $PATH or add the
appropriate directory to the $PATH variable.

On Windows, you set your environment variable PATH to include the path to
Python programs (typically something like C:\Python25), which you can find
under the system control panel.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From michele.simionato at gmail.com  Mon Feb 16 05:27:11 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 02:27:11 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>

On Feb 16, 10:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...

multiprocessing is already implemented for you in the standard
library.
Of course it does not require heavy hardware requirements.

> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?

You can take advantage of multi cores, just not with threads but with
processes,
which BTW is the right way to go in most situations. So (assuming you
are not
a troll) you are just mistaken in thinking that the only way to
use multicores is via multithreading.

          Michele Simionato


From asmodai at in-nomine.org  Mon Feb 16 05:29:16 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 16 Feb 2009 11:29:16 +0100
Subject: Windows vista
In-Reply-To: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
References: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
Message-ID: <20090216102916.GF39358@nexus.in-nomine.org>

-On [20090216 09:50], loveshadowdog at yahoo.com (loveshadowdog at yahoo.com) wrote:
>the error screen says that the my personal fire wall is blocking the
>program to run.

My default Windows Vista x64 installation is not blocking my IDLE at all, so
it might be you're not using the standard Windows firewall but perhaps some
third-party one.

Most of the time in the firewall configuration windows you can add specific
executables to be allowed access. As such you probably have to point it to
the C:\Python25\Python.exe file, but that's just a guess.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From greg.ewing at canterbury.ac.nz  Mon Feb 16 05:45:50 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 16 Feb 2009 23:45:50 +1300
Subject: ANN: Assembly Line 0.8.2
Message-ID: <mailman.39.1234788593.11746.python-announce-list@python.org>

I have released an updated version of Assembly Line,
my entry in PyWeek 6 and later the Pyggy Awards.

http://media.pyweek.org/dl/1007/greg_pgF09/AssemblyLine-0.8.2.zip

About Assembly Line
-------------------

Become a FADE!

That's Factory Automation Design Engineer for Pixall Manufacturing, the world 
leader in pixellated products.

We give you product designs from our R&D department, and you design and build 
factories to manufacture them as efficiently possible. Make a good profit and 
you'll earn big bonuses and a huge salary!

-- 
Greg


From digitig at gmail.com  Mon Feb 16 06:07:49 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 16 Feb 2009 11:07:49 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <aee48b3c0902160307g394c08aeh23259e6c16dc8d24@mail.gmail.com>

2009/2/16  <rushenaly at gmail.com>:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>      1. Ruby (Mastering as much as possible)
>      2. Python (Mastering as much as possible)
>      3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python.

In a way, you've answered your own question. Why are you learning
three languages? Perhaps you've already realised that being
Turing-complete isn't the last word in language choice; that different
languages make different compromises, so the best language for one
task may not be the best language for a different task. Ok, Python
doesn't cope well with threading. It doesn't cope well with hard
real-time, either. So what? A deep saucepan isn't much use for making
an omlette (it can be done, but it's inefficient), but it's ideal for
making soup. Just because multiple cores are available doesn't mean
they will help your program significantly. Most real-world programs
work just fine in a single core, and it usually just isn't worth all
of the extra design effort, coding effort and debugging effort of
threading to cut the user response time down from a tenth of a second
to a twentieth. For *most* applications the single-thread Python
programmer will have something written, shipped and doing the job
whilst the multi-thread programmer is still trying to debug an
intermittent livelock that goes away whenever instrumentation is
added.  For those few cases where threading is a genuine advantage,
Python is not ideal. But in the real world I doubt they're enough to
make a significant dent in Python's popularity.

-- 
Tim Rowe


From yanegomi at gmail.com  Mon Feb 16 06:50:22 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 03:50:22 -0800
Subject: Creating custom formatter function
Message-ID: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>

Hello Python folks,
    I have a function where I'd like to prefix a format string via a
`prefix' string. The definition of the base method is as follows:

#START CODE
def print_message(prefix, out_stream, fmt, *args, **kwargs):
    """ Print out [prefix]: [message] """

    message = fmt

    if 0 < len(kwargs.keys()):
        message = message % kwargs

    if 0 < len(args):
        message = message % args

    out_stream.write(message + "\n")
#END CODE

    My python 2.4.5 interpreter fails at `message % args' claiming the
following:

  File "logging.py", line 10, in print_message
    message = message % (args)
TypeError: not all arguments converted during string formatting

    Thus I was wondering what the proper means was for formatting
strings. I'm new to this portion of Python, so I obviously didn't
apply the right syntax.
TIA!
-Garrett


From rushenaly at gmail.com  Mon Feb 16 07:24:27 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 04:24:27 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
Message-ID: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>

Hi again,

Dear Andreas

I know about GIL in ruby interpreter, they are trying to solve
problems because of GIL but it is not so important for me because i
like ruby because of its esthetic and it helps me to grasp some
programming concepts. As i know it is not so powerful language like
java. (Powerful language : rich libraries, wide community, very
variety of usage). why i want to learn python because it has syntax
like ruby but it is also powerful language, not of course as much as
java or c++

And also, i am trying to find an answer to the question mark in my
head. Is there a way to use multi cores in python as much effective
and easier as multi threading.

Dear Aleksa

Of course i have a long way to ago even if i am too old for these
things. However, i think that being able to use both cores or more is
a very big plus for execution time, speed like these. I believe many
programs will be rewritten to be able to use multiple cores.

Dear Michele

As i know every process has own hardware sources like memory and cpu
so i think it requires more source than multi threading.

Dear Tim

I want to learn python + c++ or java because of the desire of having
python's felxibility and easiness and c++ or java's stability and
speed and power together.

Thank you
Rushen





From digitig at gmail.com  Mon Feb 16 07:50:42 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 16 Feb 2009 12:50:42 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
Message-ID: <aee48b3c0902160450i56f6a5f7q54aa93879ff67a2f@mail.gmail.com>

2009/2/16  <rushenaly at gmail.com>:

> I want to learn python + c++ or java because of the desire of having
> python's felxibility and easiness and c++ or java's stability and
> speed and power together.

Yes, that's what I mean by different tradeoffs. Python is much easier
to program in than C++ or Java (in my experience, at least), but C++
and Java scale better and at least have the potential to be faster.
I'm not convinced that library support is significantly better for C++
or Java -- Python's libraries seem pretty rich to me. And that extra
speed might not be needed as often as you think. My postgrad
dissertation involved heavy number-crunching on large data sets, and
in my proposal I said I'd switch from Python to C++ when Python got
too slow. In fact, Python never did get too slow (I didn't even have
to switch to numpy), and plugging together ad-hoc modules, defined in
an XML script, was a dream in Python when I'd probably still be coding
it today in C++. Horses for courses. It's almost always wrong to say
that language A is better than language B; the most you can say is
that language A is better than language B for some specific task.


-- 
Tim Rowe


From tim.wintle at teamrubber.com  Mon Feb 16 07:54:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 16 Feb 2009 12:54:36 +0000
Subject: Module to read/write MIDI ?
In-Reply-To: <slrngph5b2.2qd.peter@box8.pjb.com.au>
References: <slrngph5b2.2qd.peter@box8.pjb.com.au>
Message-ID: <1234788876.5567.2.camel@tim-laptop>

> I had my first look around pypi.python.org/pypi yesterday and didn't
> see anything.  Is there a MIDI-module for Python ?  If not, I'll
> email Sean to ask if he'd mind me translating his module into Python3...

<http://www.mxm.dk/products/public/pythonmidi>

This is the only project I have seen that aims to do that - I haven't
actually used it, and there might be others out there (I believe pygame
<www.pygame.org> supports midi-output).



> 
> Regards,  Peter
> 



From jldunn2000 at googlemail.com  Mon Feb 16 07:59:32 2009
From: jldunn2000 at googlemail.com (loial)
Date: Mon, 16 Feb 2009 04:59:32 -0800 (PST)
Subject: replace ftp by local copy
Message-ID: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>

I have been given an old python application that calls ftplib in many
places to copy files to a remote server.

I have been given the task of cloneing this code so that ftp is not
used, but files are just copied locally in a scenerio where ftp is not
available. The code is not well structured which makes this more
difficult.

Before starting this just wondered if anyone has previously done
anything like overriding the ftplib module so that I can leave the
existing code largely unchanged but have the ftp commands just copy
files locally?

Just thought I'd ask before getting started.






From fmaresca at gmail.com  Mon Feb 16 08:02:06 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 11:02:06 -0200
Subject: logging and daemons
Message-ID: <20090216130206.GA20397@gmail.com>


Hello.

I'm in the process of replacing a custom logger class in one of my apps
that has several daemons. In the last step of daemonizing a program,
after closing fds, stderr and stdout are redirected to the logfile of
the program.

Now, I'm trying to use TimedRotatingFileHandler as the only channel when
the programs run in daemon mode. My problem is: I can't see a goog way
to redirect stderr/stdout both to the logger.

Note that I don't have any print statements in any of my code, but I
can't be sure about all the modules I'm importing, and I like to get any
uncached exception info that may go to stderr/stdout to show up in the
logfiles.

Any ideas?
Thanks a lot,

-- 
Fernando 
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From yanegomi at gmail.com  Mon Feb 16 08:07:45 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 05:07:45 -0800
Subject: logging and daemons
In-Reply-To: <20090216130206.GA20397@gmail.com>
References: <20090216130206.GA20397@gmail.com>
Message-ID: <364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:02 AM, Fernando M. Maresca <fmaresca at gmail.com> wrote:
>
> Hello.
>
> I'm in the process of replacing a custom logger class in one of my apps
> that has several daemons. In the last step of daemonizing a program,
> after closing fds, stderr and stdout are redirected to the logfile of
> the program.
>
> Now, I'm trying to use TimedRotatingFileHandler as the only channel when
> the programs run in daemon mode. My problem is: I can't see a goog way
> to redirect stderr/stdout both to the logger.
>
> Note that I don't have any print statements in any of my code, but I
> can't be sure about all the modules I'm importing, and I like to get any
> uncached exception info that may go to stderr/stdout to show up in the
> logfiles.
>
> Any ideas?
> Thanks a lot,

Hopefully this'll answer your question:

You can actually set sys.std[err|out] to your ?file? descriptor of
choice in python (it has to have read, write, and flush methods, IIRC
to function). The only thing is (like all things dealing with multiple
file descriptors like std[err|out]) the output may come in out of
order due to flushing and insertion into the buffers, but it shouldn't
be as much of an issue considering that the file descriptor for both
items is the same descriptor, but this is just a note of forewarning.

nose does something similar with the way that it scrapes stderr /
stdout for exception data and messages.

-Garrett


From fmaresca at gmail.com  Mon Feb 16 08:15:16 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 11:15:16 -0200
Subject: logging and daemons
In-Reply-To: <364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
Message-ID: <20090216131516.GA21655@gmail.com>

Hello, thanks for the answer.

On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
> You can actually set sys.std[err|out] to your ?file? descriptor of
> choice in python (it has to have read, write, and flush methods, IIRC
> to function). The only thing is (like all things dealing with multiple
> file descriptors like std[err|out]) the output may come in out of
> order due to flushing and insertion into the buffers, but it shouldn't
> be as much of an issue considering that the file descriptor for both
> items is the same descriptor, but this is just a note of forewarning.
Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
fd of the logfile change in every rotation of the logfile. So the direct
approach of std[out|err] redirection to the logfile fd obtained from
the logger instance is unusable (it works fine with a simple file
handler). 
I'm looking into this because I really need rotating, because when
debugging is on, large amounts of data are logged, and because I like
the logging module approach in every aspect.

Also, may it be possible to derive the class and add a file-like write
method? Anyone using logging in this manner?


Cheers,
-- 
Fernando
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From andrew at acooke.org  Mon Feb 16 08:17:06 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 16 Feb 2009 10:17:06 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <977bad202990de5797c2efcf8d50ed81.squirrel@localhost>

rushenaly at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>       1. Ruby (Mastering as much as possible)
>       2. Python (Mastering as much as possible)
>       3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...

I understand why you are asking this question - you want to learn, and
that is good - but as you say, you are a beginner, and you are focussing
on one thing that has caught your eye when there are many other issues
that are more important.

The GIL is an implementation detail.  I suspect that it could be largely
removed if there was sufficient need.  But that still wouldn't make Python
a good language for programming on multiple cores.  That's not as big a
deal as you think, because we currently DON'T KNOW what would make a good
language for programming on multiple cores - it's an open topic in the
wider community.

It may be, for example, that the best approaches for concurrent
programming require a lot of automatic pre-processing that needs static
type information.  Or that mutable state is simply too much of a problem
and pure functional programming is the only way forwards.  Both of these
would be much more serious problems for Python than the GIL.  On the other
hand, Python has inbuilt support for co-routines.  Experience gained with
that might lead towards a more actors-like solution that fits naturally
within Python.

So my first point is that you are worrying about a problem that no-one yet
know how to solve, and worrying about a small and largely irrelevant part
of that.


Second, you are committing the common mistake of over-estimating the
importance of efficiency.  Python is not a fast language; it never has
been.  That does not stop it being extremely useful.  This is largely
because when it needs to do "hard work" it delegates to C libraries.  Why
can this not apply to concurrent programming too?  Maybe the top level
logic will stay in a single thread, because that is easier to program, but
libraries will use multiple cores.

So my second point is that you are being too restrictive in considering
what a future solution might look like.


In conclusion, then, I strongly suggest you stop worrying so much about
things that you don't yet have the experience to see completely, and
instead get more experience under your belt.  That sounds more harsh than
I really mean - obviously worrying about this kind of thing is part of
learning.

Incidentally, if you already know Ruby and want to improve your abilities
I am not sure learning Python is the best use of your time.  The two
languages are very similar.  You might be better taking a huge leap to
something like Haskell or OCaml.  Or, if you want to get hands-on
experience of concurrency now, Erlang.

Andrew



> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?
>
> Thank you...
> Rushen
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From andrew at acooke.org  Mon Feb 16 08:21:47 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 16 Feb 2009 10:21:47 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
Message-ID: <2f9b1132b1d38c74810f4021f6b3101b.squirrel@localhost>

andrew cooke wrote:
> something like Haskell or OCaml.  Or, if you want to get hands-on
> experience of concurrency now, Erlang.

I think for once I said something useful there.  I think you would
probably enjoy Erlang, and it would be very useful for understanding
concurrency.  Also, Erlang is not as strange a language as Haskell or
OCaml.  You will probably find it quite familiar.  And there's an
excellent book (Joe Armstrong's "Programming Erlang").

At the risk of hastening Python's demise :o) I strongly encourage you to
learn Erlang instead of Python.

Andrew




From yanegomi at gmail.com  Mon Feb 16 08:23:05 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 05:23:05 -0800
Subject: logging and daemons
In-Reply-To: <20090216131516.GA21655@gmail.com>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<20090216131516.GA21655@gmail.com>
Message-ID: <364299f40902160523l68ff57e4yac4ffbc828360d35@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca <fmaresca at gmail.com> wrote:
> Hello, thanks for the answer.
>
> On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>> You can actually set sys.std[err|out] to your ?file? descriptor of
>> choice in python (it has to have read, write, and flush methods, IIRC
>> to function). The only thing is (like all things dealing with multiple
>> file descriptors like std[err|out]) the output may come in out of
>> order due to flushing and insertion into the buffers, but it shouldn't
>> be as much of an issue considering that the file descriptor for both
>> items is the same descriptor, but this is just a note of forewarning.
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler).
> I'm looking into this because I really need rotating, because when
> debugging is on, large amounts of data are logged, and because I like
> the logging module approach in every aspect.

I cannot comment about this because I haven't used this module before.

> Also, may it be possible to derive the class and add a file-like write
> method? Anyone using logging in this manner?

Indeed, yes. That's sort of what I was hinting at with my statement
that you must have a read, write and flush method for your class. Now
that I think back, other modules like pexpect implement simple logic
to deal with writing to psuedo file descriptors as well.

Locking the data streams may or may not be required -- I'm not sure
what the underlaying portions of python expose or do not expose in
terms of scheduling in output streams.

HTH,
-Garrett


From rushenaly at gmail.com  Mon Feb 16 08:26:52 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 05:26:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
Message-ID: <0b304e24-1017-4c6b-8b94-6054f1dadc05@j38g2000yqa.googlegroups.com>

Dear Andrew,

I think reading "beating the averages" by paul graham before some
experience is not a very good decision.
:)

Thank you
Andrew


From veerendra.jangid at gmail.com  Mon Feb 16 08:39:23 2009
From: veerendra.jangid at gmail.com (VEERENDRA)
Date: Mon, 16 Feb 2009 05:39:23 -0800 (PST)
Subject: to access the gretest
Message-ID: <2b89626e-e038-4eef-aa74-4405b4c3c6bb@s9g2000prg.googlegroups.com>

Vjrocks.comhttp://www.vjrocks.com/
BCA
BCA Ist YEARhttp://www.vjrocks.com/BCA_Ist_year.html
BCA IInd YEARhttp://www.vjrocks.com/BCA_IInd_year.html
BCA IIIrd YEARhttp://www.vjrocks.com/BCA_IIIrd_year.html

LANGUAGE

Introduction to Computershttp://www.vjrocks.com/Introduction to
Computers.html
Programming IN Chttp://www.vjrocks.com/Introduction to Computers.html
C++http://www.vjrocks.com/CPlusPlus.html
Javahttp://www.vjrocks.com/Java.htmlVisual Basic.html
Visual Basichttp://www.vjrocks.com/Visual Basic.html


From ndbecker2 at gmail.com  Mon Feb 16 08:39:35 2009
From: ndbecker2 at gmail.com (Neal Becker)
Date: Mon, 16 Feb 2009 08:39:35 -0500
Subject: logging and daemons
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<20090216131516.GA21655@gmail.com>
	<364299f40902160523l68ff57e4yac4ffbc828360d35@mail.gmail.com>
Message-ID: <gnbqan$33p$1@ger.gmane.org>

Garrett Cooper wrote:

> On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca <fmaresca at gmail.com>
> wrote:
>> Hello, thanks for the answer.
>>
>> On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>>> You can actually set sys.std[err|out] to your ?file? descriptor of
>>> choice in python (it has to have read, write, and flush methods, IIRC
>>> to function). The only thing is (like all things dealing with multiple
>>> file descriptors like std[err|out]) the output may come in out of
>>> order due to flushing and insertion into the buffers, but it shouldn't
>>> be as much of an issue considering that the file descriptor for both
>>> items is the same descriptor, but this is just a note of forewarning.
>> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
>> fd of the logfile change in every rotation of the logfile. So the direct
>> approach of std[out|err] redirection to the logfile fd obtained from
>> the logger instance is unusable (it works fine with a simple file
>> handler).
>> I'm looking into this because I really need rotating, because when
>> debugging is on, large amounts of data are logged, and because I like
>> the logging module approach in every aspect.
> 
> I cannot comment about this because I haven't used this module before.
> 
>> Also, may it be possible to derive the class and add a file-like write
>> method? Anyone using logging in this manner?
> 
> Indeed, yes. That's sort of what I was hinting at with my statement
> that you must have a read, write and flush method for your class. Now
> that I think back, other modules like pexpect implement simple logic
> to deal with writing to psuedo file descriptors as well.
> 
> Locking the data streams may or may not be required -- I'm not sure
> what the underlaying portions of python expose or do not expose in
> terms of scheduling in output streams.
> 
> HTH,
> -Garrett
> --
> http://mail.python.org/mailman/listinfo/python-list

I use this, but for my own specialized purpose:

import atexit
class logger (object):
    def __init__ (self, name):
        self.name = name               # final file name
        self.f = open (self.name, 'w')
        atexit.register (self.__del__)
    def write (self, stuff):
        self.f.write (stuff)
    def close (self):
        self.f.close()
    def flush (self):
        self.f.flush()
    def reopen (self):
        self.f.flush()
        self.f.close()
        os.rename (self.name, self.name + '.old')
        self.f = open (self.name, 'w')
    def __del__ (self):
        try:
            os.remove (self.name + '.old')
        except:
            pass





From a_modelo at yahoo.com  Mon Feb 16 08:45:09 2009
From: a_modelo at yahoo.com (www.livtotravel.blogspot.com)
Date: Mon, 16 Feb 2009 05:45:09 -0800 (PST)
Subject: What is a phyton?
Message-ID: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>

is phyton a programming language? what can a python do? how is it
different from others?


From alan.isaac at gmail.com  Mon Feb 16 08:47:11 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Mon, 16 Feb 2009 13:47:11 GMT
Subject: Creating custom formatter function
In-Reply-To: <mailman.38.1234785025.11746.python-list@python.org>
References: <mailman.38.1234785025.11746.python-list@python.org>
Message-ID: <z7eml.586$Bl.525@nwrddc01.gnilink.net>

On 2/16/2009 6:50 AM Garrett Cooper apparently wrote:
> I was wondering what the proper means was for formatting
> strings.

http://docs.python.org/library/string.html#string-formatting

http://docs.python.org/library/string.html#template-strings

http://docs.python.org/library/stdtypes.html#string-formatting

As for the last: "values must be a tuple with exactly the number
of items specified by the format string, or a single mapping
object (for example, a dictionary)" unless you need only a
single argument in your format string.

hth,
Alan Isaac


From mamahitasela at yahoo.com  Mon Feb 16 08:47:22 2009
From: mamahitasela at yahoo.com (Mamahita Sela)
Date: Mon, 16 Feb 2009 05:47:22 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
Message-ID: <510115.40482.qm@web46216.mail.sp1.yahoo.com>

Dear All,

I have read several howtos for threading in PyGTK. I have tried some but with no luck.

What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.
 
I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done. 

(I am using 2.5.1, pygtk 2.10.6 on Linux x86)

This is my code:
import threading
import commands 
import gtk
import gobject

gtk.gdk.threads_init()


class PingHost(threading.Thread):
    def __init__(self, host):
        threading.Thread.__init__(self)
        self.host = host
        self.result = ()
    def run(self):
        self.result = self.host, commands.getstatusoutput('ping %s -c1' %(self.host))[0]

class Main:
    def __init__(self):
        self.win = gtk.Window()
        self.win.connect('destroy', gtk.main_quit)
        #
        self.textb = gtk.TextBuffer()
        self.textv = gtk.TextView(self.textb)
        self.textv.set_size_request(500, 500)
        #
        self.win.add(self.textv)
        self.win.show_all()
        #
        gobject.timeout_add(5000, self.do_ping)

        def do_ping(self):
        all_threads = []
        #
        for h in range(100, 105):
            host = '192.168.0.%d' %(h)
            #
            worker = PingHost(host)
            worker.start()
            all_threads.append(worker)
        #
        for t in all_threads:
            t.join()
            print t.result
        #
        return True


if __name__ == '__main__':
    app = Main()
    gtk.main()


Any help would be appreciated :)
Best regards,
M


      



From alexionne at gmail.com  Mon Feb 16 09:05:26 2009
From: alexionne at gmail.com (Aleksa Todorovic)
Date: Mon, 16 Feb 2009 15:05:26 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
Message-ID: <74e474ac0902160605g1cac34e5n387f22250be047ee@mail.gmail.com>

Or the other way around :-)

Little off-topic, but...

After several months of fighting with Java threads, dead locks, live
locks, race conditions, I've rewritten my game server synchronization
so that threads are executed in concurrent way (with only exceptions
being socket sending and recieving threads), and all synchronization
is implemented on top of Java blocking structures (little blasphemy:
the way Stackless does it). After that change, the game suddenly
started working like a charm!


On Mon, Feb 16, 2009 at 13:24,  <rushenaly at gmail.com> wrote:
> Of course i have a long way to ago even if i am too old for these
> things. However, i think that being able to use both cores or more is
> a very big plus for execution time, speed like these. I believe many
> programs will be rewritten to be able to use multiple cores.



-- 
Aleksa Todorovic - Lead Programmer
Eipix Entertainment
http://www.eipix.com/


From rushenaly at gmail.com  Mon Feb 16 09:18:35 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 06:18:35 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
	<mailman.50.1234793130.11746.python-list@python.org>
Message-ID: <6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>

Dear Aleksa,

As you mentioned, using multi cores makes programs more fast and more
popular. But what about stackless python? Does it interpret same set
of python libraries with Cpython or Does it have a special sub set?

Thank you
Rusen


From python at rgbaz.eu  Mon Feb 16 09:35:05 2009
From: python at rgbaz.eu (Python)
Date: Mon, 16 Feb 2009 15:35:05 +0100
Subject: What is a phyton?
In-Reply-To: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
Message-ID: <60C24207-5688-42E9-AD21-D07AB655AB76@rgbaz.eu>


On 16 feb 2009, at 14:45, www.livtotravel.blogspot.com wrote:

> is phyton a programming language? what can a python do? how is it
> different from others?
> --
If i were to replace 'python' with 'french'
would you be willing to write the answer in one email?
it's gonna be a loooooong email...

if you want to know, type the same questions in google...
or start by reading http://www.python.org

if you don;t want that, then maybe go to a zoo and follow the signs ;)

gr
Arno


From thorsten at thorstenkampe.de  Mon Feb 16 09:37:29 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 16 Feb 2009 15:37:29 +0100
Subject: What is a phyton?
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
Message-ID: <MPG.240398901e426a559897c4@news.individual.de>

* www.livtotravel.blogspot.com (Mon, 16 Feb 2009 05:45:09 -0800 (PST))
> is phyton a programming language?

http://en.wikipedia.org/wiki/Phyton


From exarkun at divmod.com  Mon Feb 16 09:44:36 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 16 Feb 2009 09:44:36 -0500
Subject: Threads in PyGTK: keep typing while ping-ing
In-Reply-To: <510115.40482.qm@web46216.mail.sp1.yahoo.com>
Message-ID: <20090216144436.12853.561778781.divmod.quotient.10894@henry.divmod.com>

On Mon, 16 Feb 2009 05:47:22 -0800 (PST), Mamahita Sela <mamahitasela at yahoo.com> wrote:
>Dear All,
>
>I have read several howtos for threading in PyGTK. I have tried some but with no luck.
>
>What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.

You don't need threads for this.  The GTK mainloop supports socket event
sources.  This lets you deal with the GUI and with the network in a single
thread without blocking anything.

>
>I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done.

This is because you're joining the threads in the GTK thread.  Joining
blocks until the thread being joined exits.  While you're blocking the
GTK thread like this, the GTK GUI is not updated.  If you want to keep
using threads, then you need a way to avoid joining the threads until
you know they're done.

Jean-Paul


From me at gustavonarea.net  Mon Feb 16 09:50:22 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 06:50:22 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>
Message-ID: <a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com>

On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> I lack the context to see how this could be fixed in your case, but
> this a not a show stopper, you can just keep the original decorator
> and forget about making itsignature preserving.

I'm sorry for the possibly dumb question, but how can I do that?

Thanks for all the time you've spent on this, Michele.

  - Gustavo.


From deets at nospam.web.de  Mon Feb 16 09:52:55 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 15:52:55 +0100
Subject: What is a phyton?
In-Reply-To: <MPG.240398901e426a559897c4@news.individual.de>
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
	<MPG.240398901e426a559897c4@news.individual.de>
Message-ID: <6vtcu7Flu37sU1@mid.uni-berlin.de>

Thorsten Kampe schrieb:
> * <REMOVED>(Mon, 16 Feb 2009 05:45:09 -0800 (PST))
>> is phyton a programming language?
> 
> http://en.wikipedia.org/wiki/Phyton

Thanks for quoting the OPs spam name so that the visibility of his post 
  is increased.

Diez


From michele.simionato at gmail.com  Mon Feb 16 09:56:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 06:56:20 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com>
Message-ID: <89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com>

On Feb 16, 3:50?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > I lack the context to see how this could be fixed in your case, but
> > this a not a show stopper, you can just keep the original decorator
> > and forget about making itsignature preserving.
>
> I'm sorry for the possibly dumb question, but how can I do that?
>
> Thanks for all the time you've spent on this, Michele.
>
> ? - Gustavo.

Let the original code as it is. If ain't broken, don't fix it.


From me at gustavonarea.net  Mon Feb 16 10:07:15 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:07:15 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com>
Message-ID: <89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com>

On Feb 16, 3:56 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 3:50 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
>
> > On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
> > wrote:
>
> > > I lack the context to see how this could be fixed in your case, but
> > > this a not a show stopper, you can just keep the original decorator
> > > and forget about making itsignature preserving.
>
> > I'm sorry for the possibly dumb question, but how can I do that?
>
> > Thanks for all the time you've spent on this, Michele.
>
> >   - Gustavo.
>
> Let the original code as it is. If ain't broken, don't fix it.

But the problem is that it is broken.

That decorator is for controller actions in Pylons-powered web
applications (which are instance methods). Pylons inspects the
action's signature to find what parameters it's going to pass to its
instance method, which fails because my current decorator changes the
signature.


From mail at microcorp.co.za  Mon Feb 16 10:09:55 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 16 Feb 2009 17:09:55 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
Message-ID: <00c501c99049$361f40c0$0d00a8c0@hendrik>

"andrew cooke" <andrew at a....org> wrote:


>The GIL is an implementation detail.  I suspect that it could be largely
>removed if there was sufficient need.  But that still wouldn't make Python
>a good language for programming on multiple cores.  That's not as big a
>deal as you think, because we currently DON'T KNOW what would make a good
>language for programming on multiple cores - it's an open topic in the
>wider community.

Those who do not study history are doomed to repeat it.

Occam was the language that should have won the marketing
prize, but didn't.

- Hendrik




From michele.simionato at gmail.com  Mon Feb 16 10:18:56 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 07:18:56 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com>
Message-ID: <7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com>

On Feb 16, 4:07?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> But the problem is that it is broken.
>
> That decorator is for controller actions in Pylons-powered web
> applications (which are instance methods). Pylons inspects the
> action's signature to find what parameters it's going to pass to its
> instance method, which fails because my current decorator changes the
> signature.

Yes, I am saying don't mess with the internal mechanism of Pylons and
leave it as
it was. Or was it broken from the beginning? The only reason I see for
you
to touch those things is if you are a Pylons core developer.


From germangutierrezg at yahoo.es  Mon Feb 16 10:28:52 2009
From: germangutierrezg at yahoo.es (=?iso-8859-1?Q?Germ=E1n_Guti=E9rrez?=)
Date: Mon, 16 Feb 2009 07:28:52 -0800 (PST)
Subject: RedHat 4
Message-ID: <707520.41882.qm@web24601.mail.ird.yahoo.com>

Hi,

I need to confirm and certificate python 2.5 works in a RedHat Enterprise 4 and I don't know where I find that information. Please, if anybody knows some URL in RedHat or Python with this information email me.

Thanks

 Germ?n Guti?rrez Gayoso
Temuco



      
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From me at gustavonarea.net  Mon Feb 16 10:29:32 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:29:32 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com>
Message-ID: <6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com>

On Feb 16, 4:18 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> Yes, I am saying don't mess with the internal mechanism of Pylons and
> leave it as
> it was. Or was it broken from the beginning? The only reason I see for
> you
> to touch those things is if you are a Pylons core developer.

It was broken from the beginning on Pylons.

I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
as of version 2. The decorator has always worked in TurboGears because
of the way TG finds the action arguments, but now I'm working to make
it work in Pylons too, but this is the only problem that has stopped
me from making it work under Pylons.

Thanks.


From lie.1296 at gmail.com  Mon Feb 16 10:38:58 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Mon, 16 Feb 2009 15:38:58 +0000 (UTC)
Subject: Python interface to ODF documents?
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <gnc1ag$ucn$1@ger.gmane.org>

On Sun, 15 Feb 2009 22:03:25 +0200, Dotan Cohen wrote:

> Is there a Python interface to ODF documents? I'm thinking of something
> that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.
> 

Since python is one of OpenOffice.org's Macro language, depending on your 
need, you might be able to use that as well.



From michele.simionato at gmail.com  Mon Feb 16 10:40:08 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 07:40:08 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com>
Message-ID: <2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com>

On Feb 16, 4:29?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 16, 4:18 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > Yes, I am saying don't mess with the internal mechanism of Pylons and
> > leave it as
> > it was. Or was it broken from the beginning? The only reason I see for
> > you
> > to touch those things is if you are a Pylons core developer.
>
> It was broken from the beginning on Pylons.
>
> I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> as of version 2. The decorator has always worked in TurboGears because
> of the way TG finds the action arguments, but now I'm working to make
> it work in Pylons too, but this is the only problem that has stopped
> me from making it work under Pylons.
>
> Thanks.

I see. I would ask on the Pylons list. I suspect a bound method is
passed and that you will
need to extract the corresponding function with .im_func, then making
sure that you pass
the self argument correctly. But this is wild guess since I have no
idea of how Pylons decorators
work internally as compared to TurboGears decorators.


From jcd at sdf.lonestar.org  Mon Feb 16 10:51:49 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 10:51:49 -0500
Subject: RedHat 4
In-Reply-To: <707520.41882.qm@web24601.mail.ird.yahoo.com>
References: <707520.41882.qm@web24601.mail.ird.yahoo.com>
Message-ID: <1234799509.23811.3.camel@aalcdl07.lib.unc.edu>

It *works* in RHEL 4, but it doesn't come as a package.  RHEL4 ships
with Python 2.3, and RHEL 5 only ships with Python 2.4, even though 2.5
had been out for god knows how long when it came out.

Though I haven't tested it, I wouldn't recommend replacing the system's
python binary with 2.5 if you do install it yourself.  Instead, install
it to python2.5, and set the shebang line (#!) on your scripts to point
to /usr/local/bin/python2.5  (or wherever you install it).  

Cheers,
Cliff

On Mon, 2009-02-16 at 07:28 -0800, Germ?n Guti?rrez wrote:
> Hi,
> 
> I need to confirm and certificate python 2.5 works in a RedHat
> Enterprise 4 and I don't know where I find that information. Please,
> if anybody knows some URL in RedHat or Python with this information
> email me.
> 
> Thanks
>  
> Germ?n Guti?rrez Gayoso
> Temuco
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From cd at okunah.de  Mon Feb 16 10:54:10 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 16 Feb 2009 16:54:10 +0100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <gnc25e$vis$1@svr7.m-online.net>

Hi,

> But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power).

Not necessarily.

For the memory, modern operating Systems can ustilize a copy on write 
semantics in their Applications virtual memory space. That means that after 
starting a new process with fork(), the new Process shares all physical 
Memory Pages with the original one as long a none of them writes to wome 
Memory. The first write is cought by the OS. Then the Page will be copied 
and the writing process will in future use the new copy of that page while 
the other one (or eventually many) stay with the original. Multiprocessing 
needs more Memory than well optimized Multithreading, but it is not as bad 
as it is often said.

For the CPU: There are two things that make the difference here.

One ist Context Switching. When the OS switches between two threads of the 
same Process, it does not need to change the memory lookup table. When 
switching between Processes that is always necessary. Switching from a 
Thread of Process A to a Thread of Process B is just like switching from A 
to B.

Using Threads just increases the probability that the OS can do a faster 
Context Switch. So Threads are faster here, but it is not a too big issue as 
well.

The Second Thing is Communication. With Threds you can simply use variables 
to communicate between Threads. To Prevent conflicting access to those 
Variables you will use e.g. mutexes. That can be done with Shared Memory as 
well. Shared Memory is a bit more difficult to handle than simply using the 
heap, but again the impact is not really so big.

Google uses Processes for the Tabs in Chrome, because that way they get 
around many Memory Management Problems they would have with Threads or with 
a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay 
a bit with Memory and CPU but in many situations you get a much simpler 
programming model.

Christof




From me at gustavonarea.net  Mon Feb 16 10:59:41 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:59:41 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com>
Message-ID: <17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>

On Feb 16, 4:40 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> > It was broken from the beginning on Pylons.
>
> > I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> > as of version 2. The decorator has always worked in TurboGears because
> > of the way TG finds the action arguments, but now I'm working to make
> > it work in Pylons too, but this is the only problem that has stopped
> > me from making it work under Pylons.
>
> > Thanks.
>
> I see. I would ask on the Pylons list. I suspect a bound method is
> passed and that you will
> need to extract the corresponding function with .im_func, then making
> sure that you pass
> the self argument correctly. But this is wild guess since I have no
> idea of how Pylons decorators
> work internally as compared to TurboGears decorators.

I've not seen anything special in Pylons or TurboGears 2 decorators,
except that they are all functions that use the decorator package --
while my decorator is a class that doesn't use the decorator package
yet.

My attempt to turn that decorator into a signature preserving one
using the decorator packages fails even on TurboGears 2. As of
decorator 3.0.1, I get this error:
    TypeError: You are decorating a non function: <unbound method
SecurePanel.__before__>

Isn't this caused by the fact that my decorator is a class, or the way
such a class is defined (whose code is in the first post of the
thread)? I can turn it into a function because I'm sure I'll work --
although I wanted a class to make it easier to customize.

Thanks.


From me at gustavonarea.net  Mon Feb 16 11:13:52 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 08:13:52 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>
Message-ID: <e266d916-b762-4039-8d18-72de2555d615@m16g2000vbp.googlegroups.com>

On Feb 16, 4:59 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 16, 4:40 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
>
>
> > > It was broken from the beginning on Pylons.
>
> > > I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> > > as of version 2. The decorator has always worked in TurboGears because
> > > of the way TG finds the action arguments, but now I'm working to make
> > > it work in Pylons too, but this is the only problem that has stopped
> > > me from making it work under Pylons.
>
> > > Thanks.
>
> > I see. I would ask on the Pylons list. I suspect a bound method is
> > passed and that you will
> > need to extract the corresponding function with .im_func, then making
> > sure that you pass
> > the self argument correctly. But this is wild guess since I have no
> > idea of how Pylons decorators
> > work internally as compared to TurboGears decorators.
>
> I've not seen anything special in Pylons or TurboGears 2 decorators,
> except that they are all functions that use the decorator package --
> while my decorator is a class that doesn't use the decorator package
> yet.
>
> My attempt to turn that decorator into a signature preserving one
> using the decorator packages fails even on TurboGears 2. As of
> decorator 3.0.1, I get this error:
>     TypeError: You are decorating a non function: <unbound method
> SecurePanel.__before__>
>
> Isn't this caused by the fact that my decorator is a class, or the way
> such a class is defined (whose code is in the first post of the
> thread)? I can turn it into a function because I'm sure I'll work --
> although I wanted a class to make it easier to customize.
>
> Thanks.


This is another attempt, where the decorator is a still a class but
uses an auxiliary function:
http://paste.chrisarndt.de/paste/38bf8a8443614464968d424e1f2d4182

However, that raises this exception:
http://paste.chrisarndt.de/paste/f90bc9a058254e2ca5660882011752a7?wrap=no


From michele.simionato at gmail.com  Mon Feb 16 11:18:00 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 08:18:00 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>
Message-ID: <13ae3295-912e-48a3-bd94-41186ff75b88@e18g2000vbe.googlegroups.com>

On Feb 16, 4:59?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> I've not seen anything special in Pylons or TurboGears 2 decorators,
> except that they are all functions that use the decorator package --
> while my decorator is a class that doesn't use the decorator package
> yet.
>
> My attempt to turn that decorator into a signature preserving one
> using the decorator packages fails even on TurboGears 2. As of
> decorator 3.0.1, I get this error:
> ? ? TypeError: You are decorating a non function: <unbound method
> SecurePanel.__before__>
>
> Isn't this caused by the fact that my decorator is a class, or the way
> such a class is defined (whose code is in the first post of the
> thread)? I can turn it into a function because I'm sure I'll work --
> although I wanted a class to make it easier to customize.
>
> Thanks.

The decorator class is fine, the error in clearly in what you pass to
the decorator.
You are trying to decorate an unbound method SecurePanel.__before__:
are you
sure this is really what you want to decorate? Are you decorating
automatically all methods
of SecurePanel? I have already mentioned it, but you can extract the
underlying function
from the method by using  SecurePanel.__before__.im_func if you really
want.


From dotancohen at gmail.com  Mon Feb 16 11:18:42 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 18:18:42 +0200
Subject: Python interface to ODF documents?
In-Reply-To: <gnc1ag$ucn$1@ger.gmane.org>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
	<gnc1ag$ucn$1@ger.gmane.org>
Message-ID: <880dece00902160818h77fc3509tf64e0c7788f72119@mail.gmail.com>

> Since python is one of OpenOffice.org's Macro language, depending on your
> need, you might be able to use that as well.
>

That's not a bad idea. Thanks!

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From seb.binet at gmail.com  Mon Feb 16 11:25:41 2009
From: seb.binet at gmail.com (seb.binet at gmail.com)
Date: Mon, 16 Feb 2009 08:25:41 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<gnc25e$vis$1@svr7.m-online.net>
Message-ID: <acecb8d6-fe7d-489d-b134-f68f1fded636@m42g2000yqb.googlegroups.com>

hi there,

[snip]
> Google uses Processes for the Tabs in Chrome, because that way they get
> around many Memory Management Problems they would have with Threads or with
> a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay
> a bit with Memory and CPU but in many situations you get a much simpler
> programming model.

note also that one can bet on things like KSM [1] to further improve
the memory situation.

For example, we are investigating its use in the large (read heavy)
application frameworks at CERN where the typical vmem footprint is
~2Gb.
Running KSM together with a multiprocessing-based event loop manager,
we
managed to overcommit ~300% of the memory (ie: run 3 instances of our
application on a 2Gb-per-core machine)

cheers,
sebastien

[1] http://lwn.net/Articles/306642


From jjposner at snet.net  Mon Feb 16 11:40:18 2009
From: jjposner at snet.net (John Posner)
Date: Mon, 16 Feb 2009 11:40:18 -0500
Subject: Changing the Image on a button
In-Reply-To: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
Message-ID: <40B38CF8ABFA49D297308E65A3426BD0@AMDUP>

 >> from Tkinter import *
 >> 
 >> def do():
 >>     btn.configure(image = None)
 >> 
 >> root = Tk()
 >> img1 = PhotoImage(file="bacon.gif")
 >> 
 >> btn = Button(image = img1, command = do, text = "hello" )
 >> btn.img = img1
 >> btn.pack()
 >> root.mainloop()
 >> 

Try this change:

  from: btn.configure(image = None)
    to: img1.blank()

-John







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From rjohnson42 at gmail.com  Mon Feb 16 11:50:20 2009
From: rjohnson42 at gmail.com (Dick)
Date: Mon, 16 Feb 2009 08:50:20 -0800 (PST)
Subject: Windows vista
References: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
Message-ID: <87e1d911-9d6a-4c0d-8f8a-0b66d3356408@l38g2000vba.googlegroups.com>

On Feb 16, 1:46?am, loveshadow... at yahoo.com wrote:
> Hi. My name is toru.
> I start learning python couple weeks ago.
>
> I install the compiler from python.org.
> but I cannot use the IDLE program.
> (command line works fine so far)
> the error screen says that the my personal fire wall is blocking the
> program to run.
> I am not sure how to fix this.
> By the way, I heard many people said that this is because I am using
> windows vista.
> Does anyone know how to use IDLE program on Windows Vista machine?
>
> thank you.

On my Vista machine I reply to a firewall popup the first time I run
IDLE and tell it to allow
IDLE to open a port. The next time I run IDLE, all is OK. I still have
the problem that
sometimes IDLE does not properly cleanup hung processes, which means
IDLE will not restart.

Dick Johnson


From benjamin at python.org  Mon Feb 16 11:54:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 16 Feb 2009 10:54:43 -0600
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <nad-2D157E.19151715022009@news.gmane.org>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
	<nad-2D157E.19151715022009@news.gmane.org>
Message-ID: <1afaf6160902160854u6cf8c81ck219cbc7fddafdd3f@mail.gmail.com>

On Sun, Feb 15, 2009 at 9:15 PM, Ned Deily <nad at acm.org> wrote:
>
> It would be great if someone could add OS X links for the 3.0.1 and
> 2.6.1 to the main download page, too:
>   <http://www.python.org/download/>

I've now added them to the main download page.




-- 
Regards,
Benjamin


From bieffe62 at gmail.com  Mon Feb 16 11:56:08 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 16 Feb 2009 08:56:08 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
References: <mailman.49.1234792399.11746.python-list@python.org>
Message-ID: <9289e298-a123-47e9-855a-3df71d92e078@l1g2000yqj.googlegroups.com>

On 16 Feb, 14:47, Mamahita Sela <mamahitas... at yahoo.com> wrote:
> Dear All,
>
> I have read several howtos for threading in PyGTK. I have tried some but with no luck.
>
> What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.
>
> I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done.
>
> (I am using 2.5.1, pygtk 2.10.6 on Linux x86)
>
> This is my code:
> import threading
> import commands
> import gtk
> import gobject
>
> gtk.gdk.threads_init()
>
> class PingHost(threading.Thread):
> ? ? def __init__(self, host):
> ? ? ? ? threading.Thread.__init__(self)
> ? ? ? ? self.host = host
> ? ? ? ? self.result = ()
> ? ? def run(self):
> ? ? ? ? self.result = self.host, commands.getstatusoutput('ping %s -c1' %(self.host))[0]
>
> class Main:
> ? ? def __init__(self):
> ? ? ? ? self.win = gtk.Window()
> ? ? ? ? self.win.connect('destroy', gtk.main_quit)
> ? ? ? ? #
> ? ? ? ? self.textb = gtk.TextBuffer()
> ? ? ? ? self.textv = gtk.TextView(self.textb)
> ? ? ? ? self.textv.set_size_request(500, 500)
> ? ? ? ? #
> ? ? ? ? self.win.add(self.textv)
> ? ? ? ? self.win.show_all()
> ? ? ? ? #
> ? ? ? ? gobject.timeout_add(5000, self.do_ping)
>
> ? ? ? ? def do_ping(self):
> ? ? ? ? all_threads = []
> ? ? ? ? #
> ? ? ? ? for h in range(100, 105):
> ? ? ? ? ? ? host = '192.168.0.%d' %(h)
> ? ? ? ? ? ? #
> ? ? ? ? ? ? worker = PingHost(host)
> ? ? ? ? ? ? worker.start()
> ? ? ? ? ? ? all_threads.append(worker)
> ? ? ? ? #
> ? ? ? ? for t in all_threads:
> ? ? ? ? ? ? t.join()
> ? ? ? ? ? ? print t.result
> ? ? ? ? #
> ? ? ? ? return True
>
> if __name__ == '__main__':
> ? ? app = Main()
> ? ? gtk.main()
>
> Any help would be appreciated :)
> Best regards,
> M

As you have been already told, join() blocks until the thread is
terminated. and you should avoid that.
A simple fix could by add a timeout to t.join, doing something like :
        t.join(JOIN_TIMEOUT);
        if not t.isAlive():
            print t.result

Anywway, starting a thread for each ping is not very efficient, so you
could do better by having a 'ping server thread'
that repeatedly performs the following steps:
- accepts ping command on a queue.Queue
- ping the target and waits for the result
- publish the result on another queue.Queue

At this point, the do_ping action should:
  - send a ping command to the oping server
  - check (in non blocking mode) if there is any result on the ping
results queue
  - display the result, if any

Another big speedup would be to avoid spawning a subprocess fro each
ping and instead
using directly sockets to send ICMP packets, using recipes like this :

http://code.activestate.com/recipes/409689/

Ciao
------
FB


From me at gustavonarea.net  Mon Feb 16 11:58:25 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 08:58:25 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com> 
	<13ae3295-912e-48a3-bd94-41186ff75b88@e18g2000vbe.googlegroups.com>
Message-ID: <ea4fd41c-ff61-4cf6-95ed-70e2d0195d4c@m42g2000yqb.googlegroups.com>

On Feb 16, 5:18 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 4:59 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
>
>
>
> > I've not seen anything special in Pylons or TurboGears 2 decorators,
> > except that they are all functions that use the decorator package --
> > while my decorator is a class that doesn't use the decorator package
> > yet.
>
> > My attempt to turn that decorator into a signature preserving one
> > using the decorator packages fails even on TurboGears 2. As of
> > decorator 3.0.1, I get this error:
> >     TypeError: You are decorating a non function: <unbound method
> > SecurePanel.__before__>
>
> > Isn't this caused by the fact that my decorator is a class, or the way
> > such a class is defined (whose code is in the first post of the
> > thread)? I can turn it into a function because I'm sure I'll work --
> > although I wanted a class to make it easier to customize.
>
> > Thanks.
>
> The decorator class is fine, the error in clearly in what you pass to
> the decorator.
> You are trying to decorate an unbound method SecurePanel.__before__:
> are you
> sure this is really what you want to decorate? Are you decorating
> automatically all methods
> of SecurePanel? I have already mentioned it, but you can extract the
> underlying function
> from the method by using  SecurePanel.__before__.im_func if you really
> want.

Thank you very much, it works with SecurePanel.__before__.im_func!


From deets at nospam.web.de  Mon Feb 16 12:07:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 18:07:12 +0100
Subject: logging and daemons
In-Reply-To: <mailman.42.1234789336.11746.python-list@python.org>
References: <mailman.42.1234789336.11746.python-list@python.org>
Message-ID: <6vtkq4FidfdeU1@mid.uni-berlin.de>

Fernando M. Maresca schrieb:
> Hello.
> 
> I'm in the process of replacing a custom logger class in one of my apps
> that has several daemons. In the last step of daemonizing a program,
> after closing fds, stderr and stdout are redirected to the logfile of
> the program.
> 
> Now, I'm trying to use TimedRotatingFileHandler as the only channel when
> the programs run in daemon mode. My problem is: I can't see a goog way
> to redirect stderr/stdout both to the logger.
> 
> Note that I don't have any print statements in any of my code, but I
> can't be sure about all the modules I'm importing, and I like to get any
> uncached exception info that may go to stderr/stdout to show up in the
> logfiles.

why don't you just replace the sys.stdout/sys.stdin objects with 
something that is file-like (supports a write-method, that should be 
enough in this case), and then simply write the data arriving to the 
logger instance of your trust.

If other modules don't get overly tricky to bypass sys.stdout, that 
should capture all you output, regardless of the file descriptor issues.

In the end, if a 3rd-party-module choses to open a filedescriptor itself 
& write to that, there is nothing you can do about that. But usually, 
they don't behave that way.

Diez


From vinay_sajip at yahoo.co.uk  Mon Feb 16 12:14:08 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Mon, 16 Feb 2009 09:14:08 -0800 (PST)
Subject: logging and daemons
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com> 
	<mailman.44.1234790124.11746.python-list@python.org>
Message-ID: <4aeaece7-a3ce-44e8-aa6f-c5d0165c109d@f20g2000yqg.googlegroups.com>

On Feb 16, 1:15 pm, "Fernando M. Maresca" <fmare... at gmail.com> wrote:
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler).

That's fine with a FileHandler, as long as you don't use e.g.
logrotate - that would cause the fd to change, too.

> I'm looking into this because I really need rotating, because when
> debugging is on, large amounts of data are logged, and because I like
> the logging module approach in every aspect.
>

You can capture the stuff written to std[out|err] using any file-like
object, so there are other options beyond redirecting to the fd of the
handler's fd or adding a write method to the logger. For example, if
you create a simple class which duck-types the file-like object, you
could create two instances, for stdout and stderr, and wire them into
sys. At any point you choose, you can choose to forward the
information collected to the log. Is all your stuff pure Python, or do
you have C extensions or subprocesses which are C-based? Also, I
assume you have a separate rotating log file per daemon - is that
right?

Regards,

Vinay Sajip



From Scott.Daniels at Acm.Org  Mon Feb 16 12:44:35 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 16 Feb 2009 09:44:35 -0800
Subject: Will multithreading make python less popular?
In-Reply-To: <mailman.45.1234790250.11746.python-list@python.org>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
Message-ID: <d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net>

andrew cooke wrote:
<The best short to the "GIL issue" that I have read in a long time>

Thanks a lot for writing this, I'll be pointing to it from time to time.
Were I writing such a thing I'd focus too much on the how (issues I know
that non-GIL true concurrency faces), and not enough on the high level
view.

Bravo.

--Scott David Daniels
Scott.Daniels at Acm.Org


From basilisk96 at gmail.com  Mon Feb 16 12:45:54 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Mon, 16 Feb 2009 09:45:54 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<2b4e62a9-efa8-4656-98e4-4755a10e7cac@v5g2000pre.googlegroups.com>
Message-ID: <1bd69222-6b94-42f6-ab52-844043b25ffa@q25g2000vbn.googlegroups.com>

On Feb 14, 10:19?am, Paul McGuire <pt... at austin.rr.com> wrote:
> If func is expensive, you could try memoizing it. ?Then subsequent
> "calls" just do arg lookups. ?Michele Simianato has posted a good
> memoizing decorator on the Python wiki.
>
> -- Paul

That's the trick! I almost forgot about that one. Thanks!
-Basilisk96


From ts8807385 at gmail.com  Mon Feb 16 12:55:41 2009
From: ts8807385 at gmail.com (ts8807385 at gmail.com)
Date: Mon, 16 Feb 2009 09:55:41 -0800 (PST)
Subject: chi squared (X2) in Python
Message-ID: <7f4eff87-20e2-47b4-b5e2-1c62aebd8bbc@w34g2000yqm.googlegroups.com>

I was wondering if anyone has done this in Python. I wrote two
functions that do it (I think... see below), but I do not understand
how to interpret the results. I'm doing an experiment to implement ent
in Python. ent tests the randomness of files and chi squared is
probably the best test for this purposes when compared to other tests.
Many of the statistical tests are easy (like Arithmetic Mean, etc) and
I have no problems interpreting the results from those, but chi
squared has stumped me. Here are my two simple functions, run them if
you like to better understand the output:

import os
import os.path

def observed(f):

    # argument f is a filepath/filename
    #
    # Return a list of observed characters in decimal ord(char).
    # Decimal value of characters may be 0 through 255.
    # [43, 54, 0, 255, 4, etc.]

    chars = []
    #print f

    fd = open(f, 'rb')
    bytes = fd.read(13312)
    fd.close()

    for byte in bytes:
        chars.append(ord(byte))

    #print chars

    if len(chars) != 13312:
        print "Wait... chars does not equal 13312 in observed!!!"
        return None
    else:
        return chars

def chi(char_list):

    # Expected frequency of characters. I arrived at this like so:
    # expected = number of observations/number of possibilities
    # 52 = 13312/256

    expected = 52.0

    print "observed\texpected\tx2"

    # 0 - 255
    for x in range(0,256):
        observed = 0
        for char in char_list:
            if x == char:
                observed +=1

        # The three chi squared calculations
        # one = observed - expected
        # two = one squared
        # x2 = two/expected

        # x2 = (observed - expected) squared
        #       ----------------------------
        #                expected

        one = observed - expected
        two = one * one
        x2 = two/expected

        print observed, "\t", expected, "\t", x2


chi(observed("filepath"))

The output looks similar to this:

observed	expected	x2
62 	52.0 	1.92307692308
46 	52.0 	0.692307692308
60 	52.0 	1.23076923077
68 	52.0 	4.92307692308

I know this is a bit off-topic here, just hoping someone could help me
interpret the x2 variable. After that, I'll be OK. I need to sum up
things to get an overall x2 for the bytes I've read, but before doing
that, I wanted to post this note. Please feel free to comment on any
aspect of this. If I've got something entirely wrong, let me know.
BTW, I selected 13KB (13,312) as it seems to be efficient and a decent
size to test, the data could be any amount (up to and including the
whole file) above this.

Thanks,

Tiff



From mal at egenix.com  Mon Feb 16 13:05:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 16 Feb 2009 19:05:37 +0100
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <4999AAF1.5000206@egenix.com>

On 2009-02-12 18:38, Travis wrote:
> So,
> 
> Recently I made a fix to the zlib module that I need for use at work.
> 
> I would like other employees to be able to use it without recompiling python.
> 
> I assume I can just rename it and distribute it as a python extension.
> 
> I was wondering how I can provide a way for other employees to build it.
> 
> I saw a "Universal Unix Makefile for Python extensions" that looks promising.
> 
> Is this the accepted way to compile python extensions still?

Not really. That approach was abandoned years ago in favor of a
distutils approach:

http://docs.python.org/distutils/index.html

in particular:

http://docs.python.org/distutils/setupscript.html#describing-extension-modules

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 16 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From Nicolas.Dandrimont at crans.org  Mon Feb 16 13:09:28 2009
From: Nicolas.Dandrimont at crans.org (Nicolas Dandrimont)
Date: Mon, 16 Feb 2009 13:09:28 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234763314.25586.1300573535@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
	<1234763314.25586.1300573535@webmail.messagingengine.com>
Message-ID: <20090216180928.GA14441@dirichlet.crans.org>

* python at bdurham.com <python at bdurham.com> [2009-02-16 00:48:34 -0500]:

> Nicolas,
> 
> > I would go for something like:
> > 
> > for char in word:
> >     if char in 'aeiouAEIUO':
> >         char_found = True
> >         break
> > else:
> >     char_found = False
> >
> > It is clear (imo), and it is seems to be the intended idiom for a 
> > search loop, that short-circuits as soon as a match is found.
> 
> Thank you - that looks much better that my overly complicated attempts.
> 
> Are there any reasons why I couldn't simplify your approach as follows?
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         return True
> return False

If you want to put this in its own function, this seems to be the way to go.

Cheers,
-- 
Nicolas Dandrimont

The nice thing about Windows is - It does not just crash, it displays a
dialog box and lets you press 'OK' first.
(Arno Schaefer's .sig)
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From robert.kern at gmail.com  Mon Feb 16 13:09:34 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 16 Feb 2009 12:09:34 -0600
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <gnca4u$13u$1@ger.gmane.org>

On 2009-02-12 11:38, Travis wrote:
> So,
>
> Recently I made a fix to the zlib module that I need for use at work.

Would you mind contributing this fix back to Python?

   http://bugs.python.org/

If you don't want to go to the effort of making a patch, at least a description 
of the problem you encountered and a description of your fix would be helpful.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb 16 13:11:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 16 Feb 2009 10:11:51 -0800
Subject: logging and daemons
In-Reply-To: <mailman.44.1234790124.11746.python-list@python.org>
References: <20090216130206.GA20397@gmail.com>	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<mailman.44.1234790124.11746.python-list@python.org>
Message-ID: <34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>

Fernando M. Maresca wrote:
  On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>> You can actually set sys.std[err|out] to your ?file? descriptor of
>> choice in python ....
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler). 

Right, so you stick something in as stderr/stdout that talks to the
logfile.  That is, something like:

     import sys

     class MyFakeStdout(object):
         def flush(self):
             pass
         def write(self, text):
             <code to actually do the logging>
     sys.stderr = sys.stdout = MyFakeStdout()


--Scott David Daniels
Scott.Daniels at Acm.Org


From bedouglas at earthlink.net  Mon Feb 16 13:25:52 2009
From: bedouglas at earthlink.net (bruce)
Date: Mon, 16 Feb 2009 10:25:52 -0800
Subject: pythojn/xpath question...
Message-ID: <445301c99064$00c80e50$0301a8c0@tmesa.com>

hi...

using libxml2dom as the xpath lib

i've got a situation where i can have:
 foo=a.xpath( /html/body/table[2]/tr[45]/td)
and i can get
 11 as the number of returned td elements for the 45th row...

this is as it should be.

however, if i do:
 foo=a.xpath( /html/body/table[2]/tr)

and then try to iterate through to the 45th "tr", and try to get the number
of "td" elements..
i can't seem to get the additional xpath that has to be used,

i've tried a number of the following with no luck...
  l1 = libxml2dom.toString(tmp_[0])
  print "l1 = "+l1+"\n"

  ldx = 0
  for l in tmp_:
    print "ld ="+str(ldx)
    if ldx==45:
      #needs to be a better way...
      #l1 = libxml2dom.toString(tmp_[0])
      l1 = libxml2dom.toString(l)
      #print "1111 = ",l1

      q1 = libxml2dom
      b1 = q1.parseString(l1, html=1)
      #dd1 = b1.xpath("//td[not(@width)]")
      #data = b1.xpath("//td/font")
      #data = b1.xpath("//td[@valign='top'][not(@width)]")
      #data =
b1.xpath("//child::td[position()>0][@valign='top'][not(@width)]")
      #data = b1.xpath("//td/parent::*/td[@valign='top'][not(@width)]")
      #data = b1.xpath("//td[position()]")
      #data = b1.xpath("//parent::tr[position()=1]/td")
      data = b1.xpath("//td[@valign='top'][not(@width)]")


it appears that i somehow need to get the direct child/node of the parent
"tr" that's the "td"...
it looks like using ("//td..." gets all the underlying child "td"... as
opposed to the direct
1st level child/siblings... any thoughts/pointers would be appreciated...

thanks...




From jcd at sdf.lonestar.org  Mon Feb 16 13:34:17 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 13:34:17 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <20090216052846.GA12723@dirichlet.crans.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
Message-ID: <1234809257.26675.14.camel@aalcdl07.lib.unc.edu>


On Mon, 2009-02-16 at 00:28 -0500, Nicolas Dandrimont wrote:
> * python at bdurham.com <python at bdurham.com> [2009-02-16 00:17:37 -0500]:
> 
> > I need to test strings to determine if one of a list of chars is
> > in the string. A simple example would be to test strings to
> > determine if they have a vowel (aeiouAEIOU) present.
> > I was hopeful that there was a built-in method that operated
> > similar to startswith where I could pass a tuple of chars to be
> > tested, but I could not find such a method.
> > Which of the following techniques is most Pythonic or are there
> > better ways to perform this type of match?
> > # long and hard coded but short circuits as soon as match found
> > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
> > ... :
> > -OR-
> > # flexible, but no short circuit on first match
> > if [ char for char in word if char in 'aeiouAEIOU' ]:
> > -OR-
> > # flexible, but no short circuit on first match
> > if set( word ).intersection( 'aeiouAEIOU' ):
> 
> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
> 
> (No, I did not forget to indent the else statement, see
> http://docs.python.org/reference/compound_stmts.html#for)
> 
> It is clear (imo), and it is seems to be the intended idiom for a search
> loop, that short-circuits as soon as a match is found.
> 

If performance becomes an issue, you can tune this very easily, so it
doesn't have to scan through the string 'aeiouAEIOU' every time, by
making a set out of that:

vowels = set('aeiouAEIOU')
for char in word 
    if char in vowels:
        return True
return False

Searching in a set runs in constant time.  


> Cheers,
> --
> http://mail.python.org/mailman/listinfo/python-list



From laplacian42 at gmail.com  Mon Feb 16 13:43:12 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 10:43:12 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
Message-ID: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>

On Feb 16, 2:34?am, Python Nutter <pythonnut... at gmail.com> wrote:
> Had a look and it is still under my radar unfortunately because of
> TkInter. OceanGUI

Note: spelling is "OcempGUI". Also, since google broke some of the
links,
here's that main link again:

http://ocemp.sourceforge.net/gui.html

> has a lot of large decencies (Pygame, SDL libraries,
> PyObjC, etc.) to install on my system

Well, to be fair, SDL is pretty commonly-used software and they offer
binary downloads for Mac OS X and MS Windows. Pygame seems to provide
the same. So, installation should be a breeze.

> to just to get a GUI thats no
> better loking than TkInter which comes pre-installed (no dependencies)
> on most every major platform.

Well, of course, there *is* a dependency: you need Tcl/Tk installed.

> If I was writing a game I might be interested, but I'd want to do some
> serious skinning of that GUI to make it look better.

I suppose so, but the point of my post was that by default it makes
quite a nice GUI toolkit.

> For applications installing the full wxWidgets or Qt toolkits would be
> less disk space and dependcies than OceanGUI

What? Qt and wX are *huge* compared to OcempGUI.

> and performance would
> probably be higher.

Probably, but wX and Qt are written in C++. OcempGUI is pure Python,
which would make it easier for the Python community to help extend,
optimize, and maintain.

> TkInter also has many skins/themes you can add
> that makes it rather, although not 100% native looking on target
> systems.

OcempGUI can also be "themed" as well. Though I'm not sure how much is
out there yet.


From dotancohen at gmail.com  Mon Feb 16 13:52:41 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 20:52:41 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <880dece00902161052j12cd2a64m3108ecd47c2bbbbe@mail.gmail.com>

>> For applications installing the full wxWidgets or Qt toolkits would be
>> less disk space and dependcies than OceanGUI
>
> What? Qt and wX are *huge* compared to OcempGUI.
>

Don't forget that many people will already have Qt already installed,
such as KDE users, or those who use Skype, Google Earth, or Opera.
Though KDE's Qt will likely be accessibily installed in a convinient
place, though, I'm not so sure about those other examples.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From vedrandekovic at gmail.com  Mon Feb 16 13:58:27 2009
From: vedrandekovic at gmail.com (vedrandekovic at gmail.com)
Date: Mon, 16 Feb 2009 10:58:27 -0800 (PST)
Subject: wxPython and Croatian characters
Message-ID: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>

Hello,

I have problem with configuring my wxPython script to work with
Croatian characters like:  ?,?,?,?,?.
Here is my simple script without wxPython (this script works):

      # -*- coding: utf-8 -*-
      s = "hello normal string ?????"
      print s

..here is my snippet with wxPython:

    text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
example,we have character "?"

...when I run this text, it looks something like:  "Mati",some weird
characters ,and "ni"

Regards,
John


From deets at nospam.web.de  Mon Feb 16 14:03:45 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 20:03:45 +0100
Subject: pythojn/xpath question...
In-Reply-To: <mailman.63.1234808761.11746.python-list@python.org>
References: <mailman.63.1234808761.11746.python-list@python.org>
Message-ID: <6vtrkiFltc8eU1@mid.uni-berlin.de>

bruce schrieb:
> hi...
> 
> using libxml2dom as the xpath lib
> 
> i've got a situation where i can have:
>  foo=a.xpath( /html/body/table[2]/tr[45]/td)
> and i can get
>  11 as the number of returned td elements for the 45th row...
> 
> this is as it should be.
> 
> however, if i do:
>  foo=a.xpath( /html/body/table[2]/tr)
> 
> and then try to iterate through to the 45th "tr", and try to get the number
> of "td" elements..
> i can't seem to get the additional xpath that has to be used,
> 
> i've tried a number of the following with no luck...
>   l1 = libxml2dom.toString(tmp_[0])
>   print "l1 = "+l1+"\n"
> 
>   ldx = 0
>   for l in tmp_:
>     print "ld ="+str(ldx)
>     if ldx==45:
>       #needs to be a better way...
>       #l1 = libxml2dom.toString(tmp_[0])
>       l1 = libxml2dom.toString(l)
>       #print "1111 = ",l1
> 
>       q1 = libxml2dom
>       b1 = q1.parseString(l1, html=1)
>       #dd1 = b1.xpath("//td[not(@width)]")
>       #data = b1.xpath("//td/font")
>       #data = b1.xpath("//td[@valign='top'][not(@width)]")
>       #data =
> b1.xpath("//child::td[position()>0][@valign='top'][not(@width)]")
>       #data = b1.xpath("//td/parent::*/td[@valign='top'][not(@width)]")
>       #data = b1.xpath("//td[position()]")
>       #data = b1.xpath("//parent::tr[position()=1]/td")
>       data = b1.xpath("//td[@valign='top'][not(@width)]")
> 
> 
> it appears that i somehow need to get the direct child/node of the parent
> "tr" that's the "td"...
> it looks like using ("//td..." gets all the underlying child "td"... as
> opposed to the direct
> 1st level child/siblings... any thoughts/pointers would be appreciated...

  - you don't give enough information, as you don't provide the html
  - the above code is obviously not the one running, as I can't see 
anything that's increasing your running variable ldx
  - using l as variable names is extremely confusing, because it's hard 
to distinguish from 1 (the number). Using l1 is even worse.
  - xpath usually counts from 1, whereas python is 0-based. As is your 
code. So you most probably have a off-by-one-error.
  - you should read a xpath-tutorial, as "//td"'s purpose is to fetch 
*all*  elements td from the document root, as it is clearly stated here: 
http://www.w3.org/TR/xpath#path-abbrev. So it's no wonder you get more 
than you expect. Direct child nodes are found by simply omitting the 
axis specifier.

Diez



From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 16 14:04:59 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 16 Feb 2009 20:04:59 +0100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
	<00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
Message-ID: <4999c674$0$10270$426a74cc@news.free.fr>

laplacian42 at gmail.com a ?crit :
> On Feb 16, 1:52 pm, Dotan Cohen <dotanco... at gmail.com> wrote:
>> Don't forget that many people will already have Qt already installed,
>> such as KDE users, or those who use Skype, Google Earth, or Opera.
>> Though KDE's Qt will likely be accessibily installed in a convinient
>> place, though, I'm not so sure about those other examples.
>>
> 
> Well, yes. KDE users will already have Qt installed (and maybe PyQt)
> but may groan at the prospect of having to install GTK+ and PyGTK.
> Gnome users will already have GTK+ installed (and maybe PyGTK),  but
> may groan at having to install Qt and PyQt.  However, both will likely
> have no qualms about installing SDL and Pygame (which are pretty small
> and also allow them to play various games as well).

FWIW (and servers set aside, of course), I can hardly remember of any of 
linux box I worked one not having both GTK and KDE installed.


From deets at nospam.web.de  Mon Feb 16 14:06:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 20:06:53 +0100
Subject: wxPython and Croatian characters
In-Reply-To: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
Message-ID: <6vtrqdFltc8eU2@mid.uni-berlin.de>

vedrandekovic at gmail.com schrieb:
> Hello,
> 
> I have problem with configuring my wxPython script to work with
> Croatian characters like:  ?,?,?,?,?.
> Here is my simple script without wxPython (this script works):
> 
>       # -*- coding: utf-8 -*-
>       s = "hello normal string ?????"
>       print s
> 
> ..here is my snippet with wxPython:
> 
>     text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> example,we have character "?"
> 
> ...when I run this text, it looks something like:  "Mati",some weird
> characters ,and "ni"

Unless you are using python 3.0 (which I doubt, afaik no wx available), 
your above coding declaration is useless for the shown piece of code, as 
it only applies to unicode literals, which are written with a preceding u.

So

u"m?nsch ist doch nicht so schwer"


gives you an unicode literal, that wx might work with (don't know wx)

And of course you need to make sure your editor produces utf-8 as 
output, otherwise the exercise is futile as well.

Diez


From regebro at gmail.com  Mon Feb 16 14:08:19 2009
From: regebro at gmail.com (Lennart Regebro)
Date: Mon, 16 Feb 2009 20:08:19 +0100
Subject: To 3.0.2 or not to 3.0.2?
Message-ID: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>

I discovered some remaining cmp() in 3.0.1, 38 minutes after Benjamin
fixed them. :) Unfortunately, that means porting setuptools to 3.0.1
will be a bit difficult. So my question is: Will there be a 3.0.2 with
those fixes, or should I add workaround code for 3.0.1?

-- 
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 16 14:11:04 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 16 Feb 2009 20:11:04 +0100
Subject: illegal list name
In-Reply-To: <mailman.6.1234743905.11746.python-list@python.org>
References: <mailman.6.1234743905.11746.python-list@python.org>
Message-ID: <4999c7e0$0$4785$426a74cc@news.free.fr>

Sandra Quiles a ?crit :

> Hello. I have followed the instructions of a post on Installing mailman 
> on OS X 10.4, and got to step 7 and hit this error.
> 
(snip)
> So. illegal name error. it list listname as 'mailman@<mycomputername>'
> 
> that's in response to the 'bin/newlist mailman' command

Sorry, this has nothing to do with Python. Please refer to mailman's 
documentation, mailing list or whatever.

> also, I purchased the Postfix Enabler, but have no clue what to do with 
> the software.

Nor do I.

> Tips, advise, hand-holding welcomed.

Start here:
http://catb.org/~esr/faqs/smart-questions.html


HTH


From laplacian42 at gmail.com  Mon Feb 16 14:16:39 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 11:16:39 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
Message-ID: <00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>

On Feb 16, 1:52?pm, Dotan Cohen <dotanco... at gmail.com> wrote:
>
> Don't forget that many people will already have Qt already installed,
> such as KDE users, or those who use Skype, Google Earth, or Opera.
> Though KDE's Qt will likely be accessibily installed in a convinient
> place, though, I'm not so sure about those other examples.
>

Well, yes. KDE users will already have Qt installed (and maybe PyQt)
but may groan at the prospect of having to install GTK+ and PyGTK.
Gnome users will already have GTK+ installed (and maybe PyGTK), but
may groan at having to install Qt and PyQt. However, both will likely
have no qualms about installing SDL and Pygame (which are pretty small
and also allow them to play various games as well).


From fmaresca at gmail.com  Mon Feb 16 14:19:35 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 17:19:35 -0200
Subject: logging and daemons
In-Reply-To: <34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<mailman.44.1234790124.11746.python-list@python.org>
	<34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>
Message-ID: <20090216191935.GA11254@gmail.com>

On Mon, Feb 16, 2009 at 10:11:51AM -0800, Scott David Daniels wrote:
> Fernando M. Maresca wrote:
>  On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>>> You can actually set sys.std[err|out] to your ?file? descriptor of
>>> choice in python ....
>> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
>> fd of the logfile change in every rotation of the logfile. So the direct
>> approach of std[out|err] redirection to the logfile fd obtained from
>> the logger instance is unusable (it works fine with a simple file
>> handler). 
>
> Right, so you stick something in as stderr/stdout that talks to the
> logfile.  That is, something like:
>
>     import sys
>
>     class MyFakeStdout(object):
>         def flush(self):
>             pass
>         def write(self, text):
>             <code to actually do the logging>
>     sys.stderr = sys.stdout = MyFakeStdout()
>
Thanks a lot for the input.
That's pretty much what I'm doing right now, just wondered if were a
cleanest way.

Cheers,

-- 
Fernando
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From stefaan.himpe at gmail.com  Mon Feb 16 14:44:55 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Mon, 16 Feb 2009 20:44:55 +0100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <mailman.16.1234763316.11746.python-list@python.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<20090216052846.GA12723@dirichlet.crans.org>
	<mailman.16.1234763316.11746.python-list@python.org>
Message-ID: <Xmjml.667$Hk2.138@newsfe22.ams2>

An entirely different approach would be to use a regular expression:

import re
if re.search("[abc]", "nothing expekted"):
    print "a, b or c occurs in the string 'nothing expekted'"

if re.search("[abc]", "something expected"):
    print "a, b or c occurs in the string 'something expected'"

Best regards,
Stefaan.


From steve at holdenweb.com  Mon Feb 16 14:45:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 16 Feb 2009 14:45:21 -0500
Subject: replace ftp by local copy
In-Reply-To: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>
References: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>
Message-ID: <gncfog$k1v$1@ger.gmane.org>

loial wrote:
> I have been given an old python application that calls ftplib in many
> places to copy files to a remote server.
> 
> I have been given the task of cloneing this code so that ftp is not
> used, but files are just copied locally in a scenerio where ftp is not
> available. The code is not well structured which makes this more
> difficult.
> 
> Before starting this just wondered if anyone has previously done
> anything like overriding the ftplib module so that I can leave the
> existing code largely unchanged but have the ftp commands just copy
> files locally?
> 
> Just thought I'd ask before getting started.
> 
I don't remember anyone mentioning this, but it sounds like the soundest
engineering approach, and the one least likely to induce breakage ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From hniksic at xemacs.org  Mon Feb 16 14:48:02 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 16 Feb 2009 20:48:02 +0100
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
	<slrngpgdb7.ug6.nick@irishsea.home.craig-wood.com>
Message-ID: <87d4dii2od.fsf@mulj.homelinux.net>

Nick Craig-Wood <nick at craig-wood.com> writes:

> Christian Heimes <lists at cheimes.de> wrote:
>>  Hrvoje Niksic schrieb:
>> > "Diez B. Roggisch" <deets at nospam.web.de> writes:
>> > 
>> >> The answer is easy: if you use C, you can use ctypes to create a
>> >> wrapper - with pure python, no compilation, no platform issues.
>> > 
>> > The last part is not true.  ctypes doesn't work on 64-bit
>> > architectures, nor does it work when Python is built with non-gcc Unix
>> > compilers
>> 
>>  ctypes works on 64bit systems, too. However it's a pain in the ... back
>>  to write code with ctypes that works across all platforms. I used to use
>>  ctypes for wrapper but eventually I switched to Cython.
>
> What sort of problems have you had?
>
> I find as long as I use the same types as the C code actually uses it
> all works fine.  If on a 64 bit platform long is 64 bits then it will
> be under ctypes too.

I apologize for the misinformation that ctypes doesn't work on 64-bit
systems.  The project I'm working on doesn't include ctypes, but it
could be because we don't use GCC to build, or because we also need to
support Win64.


From santosdosreis at gmail.com  Mon Feb 16 14:52:56 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 11:52:56 -0800 (PST)
Subject: Speedup Bitmap Parser
Message-ID: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>

Hello people, I'm writing a Bitmap parser for study purposes, however
when I parse a bitmap file and when I paint that file in a window, the
script take to much time.
How can I optimize my script loops to be faster ?

Here is the script

http://pastebin.com/m652b8d65

Best Regards
Jayson Reis


From Olivier.Darge at gmail.com  Mon Feb 16 15:10:22 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Mon, 16 Feb 2009 12:10:22 -0800 (PST)
Subject: flexible find and replace ?
Message-ID: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>

Hi guys,

how would you do a clever find and replace, where the value replacing
the tag
is changing on each occurence ?

".......TAG............TAG................TAG..........TAG....."

is replaced by this :

".......REPL01............REPL02................REPL03..........REPL04..."


A better and clever method than this snippet should exist I hope :

counter = 1
while 'TAG' in mystring:
    mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
    counter+=1
    ...

(the find is always re-starting at the string beginning, this is not
efficient.

any ideas ? thanks,

Olivier


From dotancohen at gmail.com  Mon Feb 16 15:19:25 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 22:19:25 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <4999c674$0$10270$426a74cc@news.free.fr>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
	<00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
	<4999c674$0$10270$426a74cc@news.free.fr>
Message-ID: <880dece00902161219h482ba846q42b9e4ec478facab@mail.gmail.com>

> FWIW (and servers set aside, of course), I can hardly remember of any of
> linux box I worked one not having both GTK and KDE installed.

I don't think that those netbooks come with Qt. And for a Windows
installer, where one may want to package the toolkit with the program,
a small toolkit may be nice. There is such an issue today on the Zim
list, where including GTK in the installer bloated it to four times
it's size.

So it may be more of a download size for Windows users, than an
installed size for Linux users (disk space is cheap, at least with
traditional rotating hard drives).

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From bearophileHUGS at lycos.com  Mon Feb 16 15:22:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 12:22:40 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <b7ab697d-6a7e-4be6-8413-d88e19165768@f3g2000yqf.googlegroups.com>

OdarR:

> how would you do a clever find and replace, where the value replacing
> the tag is changing on each occurence ?
> ".......TAG............TAG................TAG..........TAG....."
> is replaced by this :
> ".......REPL01............REPL02................REPL03..........REPL04..."


You may use something like this (tested) replacing XXXXXXXXXXXX with
the correct re function:

import re

def replacer(mobj):
    replacer.counter += 1
    return "REPL%02d" % replacer.counter
replacer.counter = 0

print re.XXXXXXXXXXXX("TAG", replacer, s1)

(If you have more than 99 replacements it will use more than two
digits.)

Bye,
bearophile


From jason.scheirer at gmail.com  Mon Feb 16 15:27:54 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 16 Feb 2009 12:27:54 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <4a46c0dc-e78c-4bf0-8b6f-e80964ce4205@o40g2000prn.googlegroups.com>

On Feb 16, 12:10?pm, OdarR <Olivier.Da... at gmail.com> wrote:
> Hi guys,
>
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
>
> ".......TAG............TAG................TAG..........TAG....."
>
> is replaced by this :
>
> ".......REPL01............REPL02................REPL03..........REPL04..."
>
> A better and clever method than this snippet should exist I hope :
>
> counter = 1
> while 'TAG' in mystring:
> ? ? mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
> ? ? counter+=1
> ? ? ...
>
> (the find is always re-starting at the string beginning, this is not
> efficient.
>
> any ideas ? thanks,
>
> Olivier

You could split on the string and interleave your new string in
between:

In [1]: def replmaker():
   ...:     index = 0
   ...:     while True:
   ...:         index += 1
   ...:         yield "REPL%02i"%index
   ...:

In [2]: def spliton(string, tag="TAG", sepgen=replmaker):
   ...:     repl_iter = sepgen()
   ...:     strlist = string.split(tag)
   ...:     length = len(strlist)
   ...:     for index, item in enumerate(strlist):
   ...:         yield item
   ...:         if index < length - 1:
   ...:             yield repl_iter.next()
   ...:

In [3]: ''.join(spliton
(".......TAG............TAG................TAG..........TAG....." ))
Out[3]:
'.......REPL01............REPL02................REPL03..........REPL04.....'


From jason.scheirer at gmail.com  Mon Feb 16 15:32:39 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 16 Feb 2009 12:32:39 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
Message-ID: <14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com>

On Feb 16, 10:58?am, vedrandeko... at gmail.com wrote:
> Hello,
>
> I have problem with configuring my wxPython script to work with
> Croatian characters like: ??,?,?,?,?.
> Here is my simple script without wxPython (this script works):
>
> ? ? ? # -*- coding: utf-8 -*-
> ? ? ? s = "hello normal string ?????"
> ? ? ? print s
>
> ..here is my snippet with wxPython:
>
> ? ? text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> example,we have character "?"
>
> ...when I run this text, it looks something like: ?"Mati",some weird
> characters ,and "ni"
>
> Regards,
> John

You may be using an ANSI build of wxWidgets instead of a unicode one.
Make sure to enable Unicode when you run ./configure, or if in
Windows, uninstall and download the win32-unicode version of the
wxPython you want.


From tjreedy at udel.edu  Mon Feb 16 15:37:24 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 15:37:24 -0500
Subject: explain
In-Reply-To: <20090216102613.GE39358@nexus.in-nomine.org>
References: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
	<20090216102613.GE39358@nexus.in-nomine.org>
Message-ID: <gnciq1$1l9$1@ger.gmane.org>

Jeroen Ruigrok van der Werven wrote:
> -On [20090216 11:17], Saeed Iravani (si.422a at yahoo.com) wrote:
>> I download python 2.5.4 and install but I dont know that how perform python?
>> I dont know from which directory perform python?
> 
> It would help if you would clarify which operating system you are using.
> 
> On Unix/Linux systems you make sure to 'rehash' your $PATH or add the
> appropriate directory to the $PATH variable.
> 
> On Windows, you set your environment variable PATH to include the path to
> Python programs (typically something like C:\Python25), which you can find
> under the system control panel.

On windows, that is not necessary for many uses.  Just use the entries 
in the start menu.




From tjreedy at udel.edu  Mon Feb 16 15:42:22 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 15:42:22 -0500
Subject: Creating custom formatter function
In-Reply-To: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>
References: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>
Message-ID: <gncj3b$1l9$2@ger.gmane.org>

Garrett Cooper wrote:
> Hello Python folks,
>     I have a function where I'd like to prefix a format string via a
> `prefix' string. The definition of the base method is as follows:
> 
> #START CODE
> def print_message(prefix, out_stream, fmt, *args, **kwargs):
>     """ Print out [prefix]: [message] """
> 
>     message = fmt
> 
>     if 0 < len(kwargs.keys()):
>         message = message % kwargs
> 
>     if 0 < len(args):

To clarify error message, "print fmt, message, args" here

>         message = message % args

This line

> 
>     out_stream.write(message + "\n")
> #END CODE
> 
>     My python 2.4.5 interpreter fails at `message % args' claiming the
> following:
> 
>   File "logging.py", line 10, in print_message
>     message = message % (args)

does not quite match this one, so one is not copy/pasted.

> TypeError: not all arguments converted during string formatting
> 
>     Thus I was wondering what the proper means was for formatting
> strings. I'm new to this portion of Python, so I obviously didn't
> apply the right syntax.
> TIA!
> -Garrett
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From tjreedy at udel.edu  Mon Feb 16 16:15:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 16:15:42 -0500
Subject: Speedup Bitmap Parser
In-Reply-To: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
Message-ID: <gncl1s$cfp$1@ger.gmane.org>

Jayson Santos wrote:
> Hello people, I'm writing a Bitmap parser for study purposes, however
> when I parse a bitmap file and when I paint that file in a window, the
> script take to much time.

1. You turned constants into static methods called for every line, 
adding attribute lookup and function call time.
2. You read the image a line at a time and break each line into separate 
pixel objects.
3. You paint each pixel by drawing and filling a 1-pixel rectangle.

> How can I optimize my script loops to be faster ?

Don't do any of the above.  Look at how other programs such as PIL or 
pygame read, store, and paint images.

> Here is the script
> http://pastebin.com/m652b8d65

tjr



From rushenaly at gmail.com  Mon Feb 16 16:20:11 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 13:20:11 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
	<d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net>
Message-ID: <f78c8501-f4ca-4d82-8210-44279d17d294@w34g2000yqm.googlegroups.com>

Hi again

OpenERP and ERP5 was written in python as i know. I really wonder how
they do this without threads. I want to see a real time graph at the
same time while i am working on the same screen. What is the secret?

Thanks
Rushen


From shreyas22 at gmail.com  Mon Feb 16 16:27:14 2009
From: shreyas22 at gmail.com (shreyas shah)
Date: Mon, 16 Feb 2009 16:27:14 -0500
Subject: Regarding Joystick
In-Reply-To: <3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
	<aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
	<3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>
Message-ID: <aa2d99d40902161327p7e2d38b5ua291c3b8475d4159@mail.gmail.com>

Hi ,

I have figured out a code with the help of archives in pygame ....

can anyone help me with controlling the speed of joystick ... i am going to
integrate joystick with a PTZ camera ... i was wondering if there are any
functions which can help me control the speed of camera and by controlling
motion of joystick


#! /usr/bin/env python

import pygame
from pygame import locals




jlist = [] # global joystick list


class Joystick:


    def __init__(self):
        pygame.init()
        self.nbJoy = pygame.joystick.get_count()

        for n in range(self.nbJoy):
            pygame.joystick.Joystick(n).init()

        try:
            for n in range(pygame.joystick.get_count()): #
                stick = pygame.joystick.Joystick(n)
                jlist.append(stick) # create a joystick instance
                stick.init() # init instance
                # report joystick charateristics #
                print '-'*20
                print 'Enabled joystick: ' + stick.get_name()
                print 'it has the following devices :'
                print '--> buttons : '+ str(stick.get_numbuttons())
                print '--> balls : '+ str(stick.get_numballs())
                print '--> axes : '+ str(stick.get_numaxes())
                print '--> hats : '+ str(stick.get_numhats())
                print '-'*20
        except pygame.error:
            print 'pygame.error, no joystick found.'





    def main(self):


    #    init() # init pygame and joystick system


        while 1: # endless loop

            for e in pygame.event.get(): # iterate over event stack


                if e.type == pygame.locals.JOYAXISMOTION: # 7
                    for j in jlist:
                        for n in range(j.get_numaxes()):
                            print 'moved axe num '+str(n)+' : ' +
str(j.get_axis(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYBALLMOTION: # 8
                    for j in jlist:
                        for n in range(j.get_numballs()):
                            print 'moved ball num '+str(n)+' : '+
str(j.get_ball(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYHATMOTION: # 9
                    for j in jlist:
                        for n in range(j.get_numhats()):
                            print 'moved hat num '+str(n)+' : '+
str(j.get_hat(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYBUTTONDOWN: # 10
                    for j in jlist:
                        for n in range(j.get_numbuttons()):
                            if j.get_button(n) : # if this is down
                                print 'down button num '+str(n)+' : '+
str(j.get_button(n))
                                print '-'*10 # separation

                elif e.type == pygame.locals.JOYBUTTONUP: # 11
                    for j in jlist:
                        for n in range(j.get_numbuttons()):
                            print 'up button num '+str(n)+' : '+
str(j.get_button(n))
                            print '-'*10 # separation


if __name__ == '__main__':
    j = Joystick()
    j.main()


thanks
shreyas






On Thu, Feb 12, 2009 at 11:36 PM, Banibrata Dutta <banibrata.dutta at gmail.com
> wrote:

> AFAIK, the mechanism / API / protocol to actuate the Camera's tilt, pan,
> zoom functions are not standardized (happy to be corrected there!), so even
> if you find something, it'd most likely be something very specific to a
> particular device.
> As for Joystick usage, I remember seeing one thread on that couple of
> months back, so searching thru the archive should give you leads.
>
> On Fri, Feb 13, 2009 at 3:33 AM, shreyas shah <shreyas22 at gmail.com> wrote:
>
>> Hi ,
>>
>> I am trying to control the motion of the camera with help of joystick , i
>> need some basic functionality where if i move a joystick to left the camera
>> moves to the left . Can anyone help me with that ?
>>
>> Thanks
>> Shreyas
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> regards,
> Banibrata
> http://www.linkedin.com/in/bdutta
>
-------------- next part --------------
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From bearophileHUGS at lycos.com  Mon Feb 16 16:29:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 13:29:11 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
Message-ID: <c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>

Jayson Santos:
> Hello people, I'm writing a Bitmap parser for study purposes,

This code:

        x = 0
        y = 0
        for line in bmp.bitmap_lines.lines:
            for color in xrange(len(line.colors)):
                canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x"
% (line.colors[color].red, line.colors[color].green, line.colors
[color].blue))
                x += 1
            x = 0
            y += 1


May be replaced with something like:

for x, color in enumerate(line.colors):
    canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x" %
(color.red, color.green, color.blue))

And maybe a RGBTriple may be replaced with an immutable namedtuple.
Using nested classes may be overkill for this program.

Use the Python profiler and profile your code with a real image, and
show us/me the profiler results, so I can give you some suggestions to
speed up your code.

Bye,
bearophile


From nick at craig-wood.com  Mon Feb 16 16:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 16 Feb 2009 15:31:55 -0600
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
Message-ID: <slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>

laplacian42 at gmail.com <laplacian42 at gmail.com> wrote:
>  I think I just found the GUI toolkit for Python I've been searching
>  for. It seems to meet all of the following requirements:
> 
>    * free software
>    * small (I don't need batteries -- Python already comes with those.)
>    * easy to use
>    * actively maintained
>    * cross-platform
>    * easy to install
>    * based on a stable and actively-maintained C library
>    * does not depend on an external scripting language (for example,
>  Tcl)
>    * well-documented
>    * not too many dependencies
>    * can easily integrate with PyOpenGL
>    * support for accessibility
> 
>  and it's also written in Python.
> 
>  I have no idea how it's stayed under the radar in the Python community
>  for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
>  gui.html). The C library it depends upon? [SDL](http://
>  www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).

Interesting!  One of the commercial apps I'm involved (C++ not python)
in uses SDL as its GUI with windows etc built on top of it.  It means
that it looks exactly the same on all supported platforms and since it
usually runs full screen that is fine.  I imagine this GUI toolkit
fits the same niche.

Presumably since it uses SDL then all the GUI will appear in one
window?  So windows within windows in the MDI style?

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon Feb 16 16:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 16 Feb 2009 15:31:55 -0600
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <slrngpjk8u.1l3.nick@irishsea.home.craig-wood.com>

python at bdurham.com <python at bdurham.com> wrote:
>  Thanks for everyone's feedback. I believe my original post's code
>  (updated following my signature) was in line with this list's feedback.
> 
>  Christian: Thanks for reminding me about exponential formats. My updated
>  code accounts for these type of numbers. I don't need to handle inf or
>  nan values. My original code's except catches an explicit ValueError
>  exception per your concern about bare excepts.
> 
>  Malcolm
> 
> <code>
>  # str_to_num.py
> 
>  def isnumber( input ):
>      try:
>          num = float( input )
>          return True
> 
>      except ValueError:
>          return False

That is a fine solution.

Last time I had to solve this I had a specific format of number to
parse - I didn't want to include all the python formats.  This is what
I came up with...  This particular code returns the converted number
or 0.0 - adjust as you see fit!

import re

_float_pattern   = re.compile(r"^\s*([-+]?(\d*\.)?\d+([eE][-+]?\d+)?)")

def atof(value):
    """
    Convert a string to an float in the same way the c-library atof()
    does.  Ie only converting as much as it can and returning 0.0 for
    an error.
    """
    match = _float_pattern.search(value)
    if match:
        return float(match.group(1))
    return 0.0

>>> atof("15.5 Sausages")
15.5
>>> atof("   17.2")
17.199999999999999
>>> atof("0x12")
0.0
>>> atof("8.3.2")
8.3000000000000007
>>> atof("potato")
0.0
>>>

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From python.list at tim.thechases.com  Mon Feb 16 16:36:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 16 Feb 2009 15:36:17 -0600
Subject: flexible find and replace ?
In-Reply-To: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <4999DC51.3010004@tim.thechases.com>

> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
> 
> ".......TAG............TAG................TAG..........TAG....."
> 
> is replaced by this :
> 
> ".......REPL01............REPL02................REPL03..........REPL04..."



This is a variant of the class I've used in the past for stateful 
replacements:

   import re

   class Counter(object):
     def __init__(self, prefix="REPL", start=1):
     	self.prefix = prefix
     	self.counter = start - 1
     def __call__(self, matchobj):
     	self.counter += 1
     	return "%s%02i" % (self.prefix, self.counter)

   r = re.compile("TAG") # the regexp to find what we want
   s = "some TAG stuff with TAG whatever more TAG stuff"

   print s
   # just use the counter
   print r.sub(Counter(), s)
   # demo a different starting number
   print r.sub(Counter(start=42), s)
   # maintain a single counter across calls
   c = Counter(prefix="Hello", start=42)
   print r.sub(c, s)
   print r.sub(c, s)

> A better and clever method than this snippet should exist I hope :
> 
> counter = 1
> while 'TAG' in mystring:
>     mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
>     counter+=1
>     ...
> 
> (the find is always re-starting at the string beginning, this is not
> efficient.

This also has problems if your search-string is a substring of 
your replacement string:

   search = "foo"
   replacement = "foobar#"

You'll get

   s = "foo_foo"
   s = "foobar01_foo"
   s = "foobar02bar01_foo"
   ...

which isn't quite what it looks like you want.

-tkc





From laplacian42 at gmail.com  Mon Feb 16 16:44:07 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 13:44:07 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
Message-ID: <588d2dad-ff75-499d-a4de-0b486e81f99f@p20g2000yqi.googlegroups.com>

On Feb 16, 4:31?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
>
> Interesting! ?One of the commercial apps I'm involved (C++ not python)
> in uses SDL as its GUI with windows etc built on top of it. ?It means
> that it looks exactly the same on all supported platforms and since it
> usually runs full screen that is fine. ?I imagine this GUI toolkit
> fits the same niche.
>
> Presumably since it uses SDL then all the GUI will appear in one
> window? ?So windows within windows in the MDI style?
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

There is a `window.py` example that comes with the distribution. It
has modal and non-modal windows within the main window.

I haven't yet seen any examples where OcempGUI runs full-screen.

The relevant portion of the manual re. subwindows is:
http://ocemp.sourceforge.net/manual/windows_and_dialogs.html


From dotancohen at gmail.com  Mon Feb 16 16:46:31 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 23:46:31 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
Message-ID: <880dece00902161346v5e753d79x228cc4930fa76e49@mail.gmail.com>

> Interesting!  One of the commercial apps I'm involved (C++ not python)
> in uses SDL as its GUI with windows etc built on top of it.  It means
> that it looks exactly the same on all supported platforms and since it
> usually runs full screen that is fine.  I imagine this GUI toolkit
> fits the same niche.
>

Most cross-platform projects come to the conclusion that it is _not_
good to look the same on each supported platform, but rather to match
the look of each individual platform. Open Office and Firefox come to
mind.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From jcd at sdf.lonestar.org  Mon Feb 16 17:06:21 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 17:06:21 -0500
Subject: wxPython and Croatian characters
In-Reply-To: <6vtrqdFltc8eU2@mid.uni-berlin.de>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<6vtrqdFltc8eU2@mid.uni-berlin.de>
Message-ID: <1234821981.28977.4.camel@aalcdl07.lib.unc.edu>

On Mon, 2009-02-16 at 20:06 +0100, Diez B. Roggisch wrote:
> vedrandekovic at gmail.com schrieb:
> > Hello,
> > 
> > I have problem with configuring my wxPython script to work with
> > Croatian characters like:  ?,?,?,?,?.
> > Here is my simple script without wxPython (this script works):
> > 
> >       # -*- coding: utf-8 -*-
> >       s = "hello normal string ?????"
> >       print s
> > 
> > ..here is my snippet with wxPython:
> > 
> >     text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> > example,we have character "?"
> > 
> > ...when I run this text, it looks something like:  "Mati",some weird
> > characters ,and "ni"
> 
> Unless you are using python 3.0 (which I doubt, afaik no wx available), 
> your above coding declaration is useless for the shown piece of code, as 
> it only applies to unicode literals, which are written with a preceding u.
> 

No.  The coding declaration does nothing to unicode literals.  It only
affects how the python's source code parser reads the the source code.
Without it, your source code will be parsed (or is it lexed?) by python
as an ascii document.  So if your document is UTF-8, it will choke as
soon as it reaches a non ascii character.  If it's encoded in UTF-16,
however, it will choke right away, as it will immediately come across a
\x00 byte, which is treated as the ascii NULL character, which is not
legal in python source code.

But print will still try to encode all unicode objects to the encoding
of your terminal, and any file writing operations will try to decode as
ASCII, unless explicitly told otherwise.  Same as without the -*- coding
-*- declaration. 

For the OP:  

When dealing with potentially non-ascii text, always use unicode objects
instead of strings, and explicitly encode them to the encoding you want
on output, unless your printing facility (here wx.StaticText) handles
that for you.  I also don't know how wxpython works in this regard.  

So:

s = u"Mati?ni broj"             # instead of "Mati?ni broj"
text = wx.StaticText(self, -1, s,(0,100))
# or if that doesn't work try this:
#text = wx.StaticText(self, -1, s.encode('utf-8'), (0,100))

Cheers,
Cliff




From martin at v.loewis.de  Mon Feb 16 17:49:18 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 16 Feb 2009 23:49:18 +0100
Subject: wxPython and Croatian characters
In-Reply-To: <mailman.76.1234821986.11746.python-list@python.org>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>	<6vtrqdFltc8eU2@mid.uni-berlin.de>
	<mailman.76.1234821986.11746.python-list@python.org>
Message-ID: <4999ED6E.1090804@v.loewis.de>

>> Unless you are using python 3.0 (which I doubt, afaik no wx available), 
>> your above coding declaration is useless for the shown piece of code, as 
>> it only applies to unicode literals, which are written with a preceding u.
>>
> 
> No.  The coding declaration does nothing to unicode literals.  It only
> affects how the python's source code parser reads the the source code.

And, as such, it *only* affects Unicode literals, really nothing else
(except for error checking).

In 2.x, non-ASCII characters can occur only in these places:
- comments. no effect on semantics of script
- string literals. run-time representation is equal to on-disk
  representation, so no effect.
- unicode literals. run-time representation is 2-byte or 4-byte UCS,
  so parser needs to decode on-disk representation to in-memory
  representation. This is the *only* place where the declared encoding
  matters.

> Without it, your source code will be parsed (or is it lexed?) by python
> as an ascii document.  So if your document is UTF-8, it will choke as
> soon as it reaches a non ascii character. 

So yes, it does an additional error check also. But the main reason for
the encoding declaration (besides sanity for text editors also) is
Unicode literals (in 3.x, also relevant for identifiers)

Regards,
Martin


From invalid at example.invalid  Mon Feb 16 17:57:28 2009
From: invalid at example.invalid (Greg Krohn)
Date: Mon, 16 Feb 2009 16:57:28 -0600
Subject: time.strptime() and time.strftime() reciprocity
Message-ID: <vbmml.10815$RJ7.7831@newsfe18.iad>

[Apologies for the use of "reciprocity" in the subject - it's a little 
pompous, I know, but it fits so well. :)]

Hello c.l.python!

I'm trying to parse some dates of the form "01/29/09 12:55 PM" from a 
CSV file, but I'm having trouble with the format string in 
time.strptime() . In testing this I found that the time module chokes on 
a string that it created itself with the same format:

ActivePython 2.6.1.1 (ActiveState Software Inc.) based on
Python 2.6.1 (r261:67515, Dec  5 2008, 13:58:38) [MSC v.1500 32 bit 
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import time
 >>> fmt = "%m/%d/%y %I:%M %p"
 >>> print time.strptime(fmt, time.strftime(fmt))
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Python26\lib\_strptime.py", line 454, in _strptime_time
     return _strptime(data_string, format)[0]
   File "C:\Python26\lib\_strptime.py", line 325, in _strptime
     (data_string, format))
ValueError: time data '%m/%d/%y %I:%M %p' does not match format 
'02/16/09 04:52
PM'

So, yeah, that seems weird to me. Does anyone get similar results, know 
why this is happening, and/or how to fix it?

Thanks.

-- 
("%s at gmail com" % "Greg Krohn".lower()).replace(" ", ".")


From santosdosreis at gmail.com  Mon Feb 16 18:08:58 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 15:08:58 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
Message-ID: <e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>

On 16 fev, 18:29, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Hello people, I'm writing a Bitmap parser for study purposes,
>
> This code:
>
> ? ? ? ? x = 0
> ? ? ? ? y = 0
> ? ? ? ? for line in bmp.bitmap_lines.lines:
> ? ? ? ? ? ? for color in xrange(len(line.colors)):
> ? ? ? ? ? ? ? ? canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x"
> % (line.colors[color].red, line.colors[color].green, line.colors
> [color].blue))
> ? ? ? ? ? ? ? ? x += 1
> ? ? ? ? ? ? x = 0
> ? ? ? ? ? ? y += 1
>
> May be replaced with something like:
>
> for x, color in enumerate(line.colors):
> ? ? canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x" %
> (color.red, color.green, color.blue))
>
> And maybe a RGBTriple may be replaced with an immutable namedtuple.
> Using nested classes may be overkill for this program.
>
> Use the Python profiler and profile your code with a real image, and
> show us/me the profiler results, so I can give you some suggestions to
> speed up your code.
>
> Bye,
> bearophile

Hello bearophile,
Thank you and Terry for your answers.
Here is the new code using your changes http://pastebin.com/m6dfe619d
And here is the profiler http://pastebin.com/m74d282b8

Best Regards
Jayson Reis


From aleksandar27 at brisiovonet.hr  Mon Feb 16 18:09:50 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Tue, 17 Feb 2009 00:09:50 +0100
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com>
Message-ID: <gncrom$iil$1@ss408.t-com.hr>

Provjeri da si nisi stavio ansii kada si instalirao wx.python.
Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u 
UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem 




From bearophileHUGS at lycos.com  Mon Feb 16 18:41:37 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 15:41:37 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
Message-ID: <ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>

Jayson Santos:
> Here is the new code using your changeshttp://pastebin.com/m6dfe619d
> And here is the profilerhttp://pastebin.com/m74d282b8

I have suggested you to profile the program mostly for pedagogical
purposes, it's often a good thing to do if you want to speed up a
program. But now it's your job to read the output of the profiler and
try to find where the performance problems are. The profiler output
will be simpler for you to read if you sort lines according to
something better than method name (something like the time used by
functions sounds better) and you tell the profiler to show only the
first few lines.

But a profiler isn't enough, you also need to use the brain. Your code
looks a bit too much OOP :-) So in Java your code may run fast enough,
but in Python it may be too much slow.
The suggestions by Terry are good if you want to speed up your code
signifiantly. Creating a very large amount of objects inside inner
loops a slow thing in Java too, not just in Python. Generally to
create an object you need to allocate memory. Try to write your program
(s) avoiding all or most memory allocations inside the inner loops,
and you will see a big improvement in running speed.

Bye,
bearophile


From santosdosreis at gmail.com  Mon Feb 16 19:13:13 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 16:13:13 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
Message-ID: <4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>

On 16 fev, 20:41, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Here is the new code using your changeshttp://pastebin.com/m6dfe619d
> > And here is the profilerhttp://pastebin.com/m74d282b8
>
> I have suggested you to profile the program mostly for pedagogical
> purposes, it's often a good thing to do if you want to speed up a
> program. But now it's your job to read the output of the profiler and
> try to find where the performance problems are. The profiler output
> will be simpler for you to read if you sort lines according to
> something better than method name (something like the time used by
> functions sounds better) and you tell the profiler to show only the
> first few lines.
>
> But a profiler isn't enough, you also need to use the brain. Your code
> looks a bit too much OOP :-) So in Java your code may run fast enough,
> but in Python it may be too much slow.
> The suggestions by Terry are good if you want to speed up your code
> signifiantly. Creating a very large amount of objects inside inner
> loops a slow thing in Java too, not just in Python. Generally to
> create an object you need to allocate memory. Try to write your program
> (s) avoiding all or most memory allocations inside the inner loops,
> and you will see a big improvement in running speed.
>
> Bye,
> bearophile

Hello bearophile,
Thank you for all, I'm reviewing all my code.
Do I need use some patters or others progamming conventions ?
I tried PIL and PyGame source however they are in C and I can't
understand read and draw functions.
Do you know a python-only image library ?

Best Regards
Jayson


From denis.kasak at gmail.com  Mon Feb 16 19:26:04 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 16 Feb 2009 16:26:04 -0800 (PST)
Subject: time.strptime() and time.strftime() reciprocity
References: <vbmml.10815$RJ7.7831@newsfe18.iad>
Message-ID: <df2094b9-1be3-4f63-8ae9-1405d08e82b9@f20g2000yqg.googlegroups.com>

On Mon, Feb 16, 2009 at 11:57 PM, Greg Krohn <invalid at example.invalid>
wrote:

<snip>

> ActivePython 2.6.1.1 (ActiveState Software Inc.) based on
> Python 2.6.1 (r261:67515, Dec  5 2008, 13:58:38) [MSC v.1500 32 bit (Intel)]
> on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import time
>>>> fmt = "%m/%d/%y %I:%M %p"
>>>> print time.strptime(fmt, time.strftime(fmt))
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "C:\Python26\lib\_strptime.py", line 454, in _strptime_time
>    return _strptime(data_string, format)[0]
>  File "C:\Python26\lib\_strptime.py", line 325, in _strptime
>    (data_string, format))
> ValueError: time data '%m/%d/%y %I:%M %p' does not match format '02/16/09
> 04:52
> PM'
>
> So, yeah, that seems weird to me. Does anyone get similar results, know why
> this is happening, and/or how to fix it?

It's actually pretty trivial to fix, which you would have also known
if you had read the message of the exception more carefully. :P

You passed the arguments for strptime() the wrong way around. Just
pass them in reverse and your problem will be fixed.

--
Denis Kasak


From noama at answers.com  Mon Feb 16 19:41:26 2009
From: noama at answers.com (Noam Aigerman)
Date: Tue, 17 Feb 2009 02:41:26 +0200
Subject: Referencing resources from python
Message-ID: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>

Hi,

What is the best way to reference a non-python file's path from inside
python ?

Until now, I (stupidly) had such lines  as:

 

theFile=open('../somefile.txt')

 

in my  python files. Now I moved my python files to another dir, and all
those relative filenames broke.

On the other hand, the solution of writing the full path of each
resource isn't welcome either, as we're working from a SVN repository
and we sometimes checkout to different dir's. I am sure there is a third
way which didn't occur to me... 

What do you recommend?

Thanks, Noam

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From kentandkat at sbcglobal.net  Mon Feb 16 19:46:04 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Mon, 16 Feb 2009 18:46:04 -0600
Subject: tkinter in python30
Message-ID: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

Does anyone know what happened to tkinter in Python3? There is a tkinter
folder in the Lib folder, but there is no Tkinter.py that I can
find. Both "from Tkinter import *" and "from _tkinter import *" result
in "no such module" error messages. What gives?

Kent


From bearophileHUGS at lycos.com  Mon Feb 16 19:47:08 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 16:47:08 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
Message-ID: <12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>

Jayson Santos:
> Do I need use some patters or others progamming conventions ?

That's a strong question...
Knowing OOP well is important, and it's often a good way to program,
etc. But... You may try to rewrite your code with functions only and
no classes (well, you may need to use classes for the TK gui).
Feel free to not follow this suggestion of mine. Even if you follow
it, it will not damage your brain :-)

Bye,
bearophile


From laplacian42 at gmail.com  Mon Feb 16 20:07:56 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 17:07:56 -0800 (PST)
Subject: tkinter in python30
References: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
Message-ID: <8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>

On Feb 16, 7:46?pm, kentand... at sbcglobal.net wrote:
> Does anyone know what happened to tkinter in Python3? There is a tkinter
> folder in the Lib folder, but there is no Tkinter.py that I can
> find. Both "from Tkinter import *" and "from _tkinter import *" result
> in "no such module" error messages. What gives?
>
> Kent

http://docs.python.org/3.0/library/tkinter.html


From tony at medioh.com  Mon Feb 16 20:10:58 2009
From: tony at medioh.com (Tony Arcieri)
Date: Mon, 16 Feb 2009 18:10:58 -0700
Subject: What are your favorite Python features?
Message-ID: <c7e6b2b00902161710p59e1945nbb6ee791db108687@mail.gmail.com>

I'm creating a new language which borrows from Python (among other
languages), and I'm curious what features of Python its users enjoy the
most.

I posted a similar thread on ruby-talk with a poll, but unfortunately my
background in Python is much weaker than it is in Ruby.  That said, here are
some of the features of Python that I'm considering adding to my language
(or are already there):

- list comprehensions
- lambdas
- keyword arguments
- built-in help
- decorators
- docstrings
- obtaining references to methods with var.method
- UCS4 internal string representation

What are *your* favorite features of Python?  I'm particularly interested in
ones not included in this list.  I'm not looking for "Python exclusive"
features so much as features you use frequently which make your life easier
which aren't particularly common among the more popular languages.

P.S. If you're curious about my language you can read about it here:
http://wiki.reia-lang.org and see some working examples of the syntax (which
borrows heavily from Python) here:
http://github.com/tarcieri/reia/tree/master/examples

--
Tony Arcieri
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From rhodri at wildebst.demon.co.uk  Mon Feb 16 20:25:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 17 Feb 2009 01:25:14 -0000
Subject: Referencing resources from python
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>
Message-ID: <op.upg18cera8ncjz@gnudebst>

On Tue, 17 Feb 2009 00:41:26 -0000, Noam Aigerman <noama at answers.com>  
wrote:

> Hi,
>
> What is the best way to reference a non-python file's path from inside
> python ?
>
> Until now, I (stupidly) had such lines  as:
>
>
> theFile=open('../somefile.txt')
>
>
> in my  python files. Now I moved my python files to another dir, and all
> those relative filenames broke.
>
> On the other hand, the solution of writing the full path of each
> resource isn't welcome either, as we're working from a SVN repository
> and we sometimes checkout to different dir's. I am sure there is a third
> way which didn't occur to me...
>
> What do you recommend?

It rather depends on what the files are.  Some (clearly not this) will
be best coded as absolute paths.  Probably your best bet otherwise is
to set an environment variable outside Python to point to the appropriate
directory, and read it out of the os.environ dictionary.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 16 20:29:31 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 16 Feb 2009 17:29:31 -0800
Subject: tkinter in python30
In-Reply-To: <8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>
References: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
	<8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902161729u784802d6xa08b94214434ccdf@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:07 PM,  <laplacian42 at gmail.com> wrote:
> On Feb 16, 7:46 pm, kentand... at sbcglobal.net wrote:
>> Does anyone know what happened to tkinter in Python3? There is a tkinter
>> folder in the Lib folder, but there is no Tkinter.py that I can
>> find. Both "from Tkinter import *" and "from _tkinter import *" result
>> in "no such module" error messages. What gives?
>>
>> Kent
>
> http://docs.python.org/3.0/library/tkinter.html

Or IOW, they fixed the capitalization of its name to bring it in line
w/ PEP8, so it's now tkinter (with a lowercase t) rather than Tkinter.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From benjamin at python.org  Mon Feb 16 20:29:37 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 16 Feb 2009 19:29:37 -0600
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
	<ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
Message-ID: <1afaf6160902161729x6c21679akdfb4998692108b67@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:50 PM, Guido van Rossum <guido at python.org> wrote:
> Can you explain the difficulty with porting setuptools in more detail?

Basically setuptools invokes a functions in distutils that was still
using cmp(). (See the latest messages in issue #1717 for all the
details.)



-- 
Regards,
Benjamin


From hellyj at ucsd.edu  Mon Feb 16 20:35:41 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Mon, 16 Feb 2009 17:35:41 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
Message-ID: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>

Hi.

I'm a newbie to python and am running:

OS X 10.5.6
Python 2.5.4

and have run easy_install for gdal like this:

/Library/Python/2.5/site-packages>sudo easy_install GDAL
Password:
Searching for GDAL
Best match: GDAL 1.6.0
Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
GDAL 1.6.0 is already the active version in easy-install.pth

Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
i386.egg
Processing dependencies for GDAL
Finished processing dependencies for GDAL

However, when I run python and try to import gdal, this is what happens:

Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import gdal
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
ImportError: No module named gdal
 >>>

Clearly, it's not being found but I don't understand how to debug this  
any further.  I have the *.egg in the site-packages directory but  
don't understand if there is something else I have to do to make it  
usable.  Any help would be much appreciated.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

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From mamahitasela at yahoo.com  Mon Feb 16 20:53:11 2009
From: mamahitasela at yahoo.com (Mamahita Sela)
Date: Mon, 16 Feb 2009 17:53:11 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
In-Reply-To: <9289e298-a123-47e9-855a-3df71d92e078@l1g2000yqj.googlegroups.com>
Message-ID: <983541.54614.qm@web46205.mail.sp1.yahoo.com>

Dear FB,

> As you have been already told, join() blocks until the
> thread is
> terminated. and you should avoid that.
> A simple fix could by add a timeout to t.join, doing
> something like :
>         t.join(JOIN_TIMEOUT);
>         if not t.isAlive():
>             print t.result
> 

Thanks for your great sample. And, thank you for your tips on speedup the ping stuff. 

However, i still have problem when adding timeout to join(). 
- It works, but only print out thread result that is not alive, as we put in the code. So, i never get result from unsuccessful ping action, which might take more time than timeout specified. 
- I still have little delay in GUI. Is it possible to make it smooth in GUI operation? When i put more timeout (say: 0.5 from 0.2), i will have to wait  longer.

PS: thanks for pointing out inefficient ping action :) I will follow the tips. But, another time I might need to do something else, like downloading files, or checking for serial devices. So, this thread thing, imho, is very important. 

Any help would be very appreciated.
M.


      



From sjmachin at lexicon.net  Mon Feb 16 21:27:16 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 16 Feb 2009 18:27:16 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com>

On Feb 17, 7:10?am, OdarR <Olivier.Da... at gmail.com> wrote:
> Hi guys,
>
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
>
> ".......TAG............TAG................TAG..........TAG....."
>
> is replaced by this :
>
> ".......REPL01............REPL02................REPL03..........REPL04..."
>
> A better and clever method than this snippet should exist I hope :
>
> counter = 1
> while 'TAG' in mystring:
> ? ? mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
> ? ? counter+=1
> ? ? ...
>
> (the find is always re-starting at the string beginning, this is not
> efficient.
>
> any ideas ? thanks,

C:\junk>type fancyrepl.py
def fancyrepl(tag, replfunc, input_string):
    count = 0
    pieces = []
    pos = 0
    taglen = len(tag)
    while 1:
        try:
            newpos = input_string.index(tag, pos)
        except ValueError:
            pieces.append(input_string[pos:])
            return ''.join(pieces)
        pieces.append(input_string[pos:newpos])
        count += 1
        pieces.append(replfunc(count))
        pos = newpos + taglen

tests = [
    '',
    'XXX',
    'XXXXXX',
    'abcdeXXX',
    'XXXfghij',
    'abcdeXXXfghij',
    'abcdeXXXfghijXXXpqrst',
    ]

for test in tests:
    print ' <', repr(test)
    result = fancyrepl('XXX', lambda n: 'SUB%d' % n, test)
    print ' >', repr(result)

C:\junk>fancyrepl.py
 < ''
 > ''
 < 'XXX'
 > 'SUB1'
 < 'XXXXXX'
 > 'SUB1SUB2'
 < 'abcdeXXX'
 > 'abcdeSUB1'
 < 'XXXfghij'
 > 'SUB1fghij'
 < 'abcdeXXXfghij'
 > 'abcdeSUB1fghij'
 < 'abcdeXXXfghijXXXpqrst'
 > 'abcdeSUB1fghijSUB2pqrst'

HTH,
John




From ironfroggy at gmail.com  Mon Feb 16 21:29:20 2009
From: ironfroggy at gmail.com (Calvin Spealman)
Date: Mon, 16 Feb 2009 21:29:20 -0500
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
Message-ID: <76fd5acf0902161829jd8966c1wc4eb0f9295948590@mail.gmail.com>

FWIW; I think a 3.0.2 would be useful socially (even volunteer projects have
marketting issues to consider). It says "we are committed to making 3.x
work", while the quick jump to 3.1 with only a limited minor fix release to
3.0 says "we stumbled into this and have to just brush this under the rug.
But we got it right this time! I hope.."

On Feb 16, 2009 2:08 PM, "Lennart Regebro" <regebro at gmail.com> wrote:

I discovered some remaining cmp() in 3.0.1, 38 minutes after Benjamin
fixed them. :) Unfortunately, that means porting setuptools to 3.0.1
will be a bit difficult. So my question is: Will there be a 3.0.2 with
those fixes, or should I add workaround code for 3.0.1?

--
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64
_______________________________________________
Python-Dev mailing list
Python-Dev at python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/ironfroggy%40gmail.com
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From odeits at gmail.com  Mon Feb 16 22:04:38 2009
From: odeits at gmail.com (odeits)
Date: Mon, 16 Feb 2009 19:04:38 -0800 (PST)
Subject: Changing the Image on a button
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
Message-ID: <e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>

On Feb 16, 8:40?am, John Posner <jjpos... at snet.net> wrote:
> ?>> from Tkinter import *
> ?>>
> ?>> def do():
> ?>> ? ? btn.configure(image = None)
> ?>>
> ?>> root = Tk()
> ?>> img1 = PhotoImage(file="bacon.gif")
> ?>>
> ?>> btn = Button(image = img1, command = do, text = "hello" )
> ?>> btn.img = img1
> ?>> btn.pack()
> ?>> root.mainloop()
> ?>>
>
> Try this change:
>
> ? from: btn.configure(image = None)
> ? ? to: img1.blank()
>
> -John
>
> E-mail message checked by Spyware Doctor (6.0.0.386)
> Database version: 5.11770http://www.pctools.com/en/spyware-doctor-antivirus/

This does in fact clear the image out, however it isn't causing the
text to display... Do i have have to create a new button and swap it
out?


From aahz at pythoncraft.com  Mon Feb 16 22:35:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 Feb 2009 19:35:02 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
	<mailman.52.1234797812.11746.python-list@python.org>
Message-ID: <gndb96$97u$1@panix3.panix.com>

In article <mailman.52.1234797812.11746.python-list at python.org>,
Hendrik van Rooyen <mail at microcorp.co.za> wrote:
>
>Occam was the language that should have won the marketing prize, but
>didn't.

It wasn't simple enough.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From bignose+hates-spam at benfinney.id.au  Mon Feb 16 22:42:17 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 17 Feb 2009 14:42:17 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
	<mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
Message-ID: <87fxidohk6.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <mail at microcorp.co.za> wrote:
> >Occam was the language that should have won the marketing prize,
> >but didn't.
> 
> It wasn't simple enough.

*bdom-tsssh* <URL:http://en.wikipedia.org/wiki/Occam's_razor>

-- 
 \      ?I guess we were all guilty, in a way. We all shot him, we all |
  `\   skinned him, and we all got a complimentary bumper sticker that |
_o__)                         said, ?I helped skin Bob.?? ?Jack Handey |
Ben Finney


From gnewsg at gmail.com  Mon Feb 16 23:18:15 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Mon, 16 Feb 2009 20:18:15 -0800 (PST)
Subject: How to verify whether a process got hanged or still alive.
References: <ead1179d-5323-4542-886a-27eddc01d848@x14g2000yqk.googlegroups.com>
Message-ID: <0f13a2e0-8aa9-46c8-bedf-023445fbe6c2@x9g2000yqk.googlegroups.com>

On 16 Gen, 00:04, neel <leon... at gmail.com> wrote:
> Hi There,
>
> I want to check the health of IEprocessusing python. I am running an
> application on IE. I have to verify that the application is not
> crashing the IE. Is there any module which can help me in getting theprocessstatus?
>
> Thanks,
> Neel


By process status you mean knowing whether the process is running,
sleeping has been suspended, [...]?
Hopefully this should be implemented in psutil soon:
http://code.google.com/p/psutil


--- Giampaolo
http://code.google.com/p/pyftpdlib


From michele.simionato at gmail.com  Mon Feb 16 23:53:39 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 20:53:39 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
	<d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net> 
	<f78c8501-f4ca-4d82-8210-44279d17d294@w34g2000yqm.googlegroups.com>
Message-ID: <b6cdce73-0dde-4aad-a7f7-2a5253ab766a@h16g2000yqj.googlegroups.com>

On Feb 16, 10:20?pm, rushen... at gmail.com wrote:
> Hi again
>
> OpenERP and ERP5 was written in python as i know. I really wonder how
> they do this without threads. I want to see a real time graph at the
> same time while i am working on the same screen. What is the secret?
>
> Thanks
> Rushen

Here is an example of using multiprocessing (which is included
in Python 2.6 and easy_installable in older Python versions)
to print a spin bar while a computation is running:

import sys, time
import multiprocessing

DELAY = 0.1
DISPLAY = [ '|', '/', '-', '\\' ]

def spinner_func(before='', after=''):
    write, flush = sys.stdout.write, sys.stdout.flush
    pos = -1
    while True:
        pos = (pos + 1) % len(DISPLAY)
        msg = before + DISPLAY[pos] + after
        write(msg); flush()
        write('\x08' * len(msg))
        time.sleep(DELAY)

def long_computation():
    # emulate a long computation
    time.sleep(3)

if __name__ == '__main__':
    spinner = multiprocessing.Process(
        None, spinner_func, args=('Please wait ... ', ''))
    spinner.start()
    try:
        long_computation()
        print 'Computation done'
    finally:
        spinner.terminate()


From peter at www.pjb.com.au  Tue Feb 17 00:04:23 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 05:04:23 GMT
Subject: printing bytes to stdout in Py3
Message-ID: <slrngpkhao.3ri.peter@box8.pjb.com.au>

Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
io.TextIOWrapper object; but I want to output bytes
  (e.g. muscript -midi t > t.mid )
and they're coming out stringified :-(  How can I either change the
encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
mode, or dup(fd) it first, or whatever the right thing to do is ?

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From peter at www.pjb.com.au  Tue Feb 17 00:15:09 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 05:15:09 GMT
Subject: Module to read/write MIDI ?
References: <slrngph5b2.2qd.peter@box8.pjb.com.au>
	<mailman.41.1234789079.11746.python-list@python.org>
Message-ID: <slrngpkhuu.3ri.peter@box8.pjb.com.au>

On 2009-02-16, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>> I had my first look around pypi.python.org/pypi yesterday and didn't
>> see anything.  Is there a MIDI-module for Python ?  If not, I'll
>> email Sean to ask if he'd mind me translating his module into Python3...
>
> <http://www.mxm.dk/products/public/pythonmidi>
>
> This is the only project I have seen that aims to do that - I haven't
> actually used it, and there might be others out there (I believe pygame
> <www.pygame.org> supports midi-output).

That looks like it should do the job :-)
I can't actually import MidiOutFile successfully from Python3.0.1 yet,
but that must be a Py2 v. Py3 issue. Might have to investigate 2to3...

Thanks,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From xi11west at gmail.com  Tue Feb 17 00:21:16 2009
From: xi11west at gmail.com (Yuanxin Xi)
Date: Mon, 16 Feb 2009 23:21:16 -0600
Subject: memory recycling/garbage collecting problem
Message-ID: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>

I'm having some problems with the memory recycling/garbage collecting
of the following testing code:

>>> a=[str(i) for i in xrange(10000000)]
This takes 635m/552m/2044 memory (VIRT/RES/SHR)

>>> b={}
>>> for i in xrange(10000000):
...     b[str(i)]=i

Then the memory usage increased to 1726m/1.6g/2048

>>> del b
I expect the memory usage drop to the ammount before b was
created(635m/552m/2044), but it's actually 1341m/1.2g/2048

Could anyone please explain why this happens?  It seems some memory
are not freed.  I'm running into problems with this as my program is
very memory cosuming and need to frequently free some object to reuse
the memory.  What is the best way to free the memory of b completely
(i.e. back to the status as b was created)?  I'm using Python 2.5.2

Thanks.

Yuanxin


From clp2 at rebertia.com  Tue Feb 17 00:31:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 16 Feb 2009 21:31:25 -0800
Subject: memory recycling/garbage collecting problem
In-Reply-To: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
Message-ID: <50697b2c0902162131j2d6790pf798bc9cdda871eb@mail.gmail.com>

On Mon, Feb 16, 2009 at 9:21 PM, Yuanxin Xi <xi11west at gmail.com> wrote:
> I'm having some problems with the memory recycling/garbage collecting
> of the following testing code:
>
>>>> a=[str(i) for i in xrange(10000000)]
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>
>>>> b={}
>>>> for i in xrange(10000000):
> ...     b[str(i)]=i
>
> Then the memory usage increased to 1726m/1.6g/2048
>
>>>> del b
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
>
> Could anyone please explain why this happens?  It seems some memory
> are not freed.  I'm running into problems with this as my program is
> very memory cosuming and need to frequently free some object to reuse
> the memory.  What is the best way to free the memory of b completely
> (i.e. back to the status as b was created)?  I'm using Python 2.5.2

My understanding is that for efficiency purposes Python hangs on to
the extra memory even after the object has been GC-ed and doesn't give
it back to the OS right away. This shouldn't matter to your program
though, as the "extra" memory will still be available for its use. And
assuming you're using CPython and a/b isn't referred to by anything
else, I believe they should be GC-ed immediately by the refcount
system after the 'del' s executed. So, in theory you shouldn't need to
worry about any of this, unless your example is not accurate and
you're dealing with cyclical references or C objects or something.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sambit2005 at gmail.com  Tue Feb 17 00:44:51 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Tue, 17 Feb 2009 18:44:51 +1300
Subject: Need an application sends from paricular port
In-Reply-To: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
References: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
Message-ID: <9e680b420902162144o69e86806wd80383579e21d333@mail.gmail.com>

 Hi
>
> I am new to Python world
>
>  I need a python script , which binds at a user defind port & sends to
> other enity , which waits at particular port.
> The other enity will respond & Python script should receive that at the
> defined port
>
> The communication will happen over UDP
>
> e.g
>
> *Python Appl*
>
> IP: 10.116.78.90
> Port : 3000
>
>
> *Other Enity* :
>
> IP: 10.116.98.87
> Port : 3010
>
>
> Pyhon Appl ------------>UDP  ----> Other Enity
>                   <--------------------------
>
>
> Please help
>
>
>
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From matzke at berkeley.edu  Tue Feb 17 01:15:40 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Mon, 16 Feb 2009 22:15:40 -0800
Subject: pythonic array subsetting
Message-ID: <499A560C.4000209@berkeley.edu>

Hi,

So I've got a square floating point array that is about 1000 x 1000.  I 
need to  subset this array as efficiently as possible based on an 
ordered sublist of the list of rownames/colnames (they are the same, 
this is a symmetric array).

e.g., if sublist is of length 500, and matches the rownames list at 
every other entry, I need to pull out a 500x500 array holding every 
other row & column in the parent array.

I have to do this hundreds of times, so speed would be useful.

Cheers!
Nick



-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From pythonnutter at gmail.com  Tue Feb 17 01:21:03 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Tue, 17 Feb 2009 17:21:03 +1100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <af90b3410902162221h1741d6p74423c6e102f6c8f@mail.gmail.com>

> Note: spelling is "OcempGUI". Also, since google broke some of the
> links,
> here's that main link again:

Thats my bad or more to the point my iPhone bad, typing fast with
spellcheck changes words to real dictionary words.


> Well, to be fair, SDL is pretty commonly-used software and they offer
> binary downloads for Mac OS X and MS Windows. Pygame seems to provide
> the same. So, installation should be a breeze.

Not on Mac. To get SDL, PyObjC, PyGame and other dependencies
installed on the platform you are talking on downloading and
installing close to 50MB+ of packages before you get to the point
where you install the OcempGUI package.

Thats a lot to ask of a user just to run my one program on their
system. If it was just myself and I wanted to go through the process
for educational/self-benefit I wouldn't mind.

But TkInter is already installed (0 dependencies) and on every Mac out
there so when I said 87Kbytes for a widget set that looks rather Mac
like I was saying compare 87Kbytes to 50+Megabytes to get a GUI for my
python application.

Along the same lines on my Linux boxes, GDK+/KDE are normally already
installed, nothing for the entire user base to install additional or
very little (additional) dependencies to install to get a wxWidget or
Qt interface going on those systems. Python wrappers are small but the
"additional" dependency installs above and beyond the base system is
what I am pointing at as killing off any interest in OcempGUI.

I also have this sneaking suspicion that the BDFL is secretly on the
sidelines waiting for the Tk tile theming engine to mature as if it
does and becomes standard in Python distributions I would say the
justification for learning wx and qt would be diminished by an unknown
quantity.

> What? Qt and wX are *huge* compared to OcempGUI.
>


From paddy3118 at googlemail.com  Tue Feb 17 01:27:15 2009
From: paddy3118 at googlemail.com (Paddy)
Date: Mon, 16 Feb 2009 22:27:15 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <7941293b-8423-42f9-8290-c1ddd7b17bc3@j38g2000yqa.googlegroups.com>

On Feb 16, 9:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs.

You are likely to find a lot of 'tick-list' type of comparison data on
the web that either needs a lot of knowledge to interpret, or is
misleading/wrong or all three!

Their are several versions of Python out their such as Ironpython,
Stackless Python, Jython as well as CPython - the main Python release.
They have different threading capabilities, but compilers of feature
comparison tick-lists tend to just stick to what CPython can do.

As an aside; if you were thinking of using threading for performance
reasons, then its best to first think of improving your general
ability to explore different algorithms. A change to an algorithm
often has the most impact on the performance of code. A better single
threaded, single process algorithm can offer better performaance than
throwing threadds or multiple processes alone when using a poor
underlying algorithm.

I was just exploring different ways of solving a problem on my blog:
  http://paddy3118.blogspot.com/2009/02/comparison-of-python-solutions-to.html
(But no parallel solutions were attempted).

Have fun programming!

- Paddy.



From paddy3118 at googlemail.com  Tue Feb 17 01:34:49 2009
From: paddy3118 at googlemail.com (Paddy)
Date: Mon, 16 Feb 2009 22:34:49 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <mailman.9571.1234720024.3487.python-list@python.org>
Message-ID: <d66c20b8-e54a-4f41-904a-3a826e53e232@v38g2000yqb.googlegroups.com>

On Feb 15, 5:46?pm, pyt... at bdurham.com wrote:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
>
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
>
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
>
> Thanks,
> Malcolm
>
> <code>
> def isnumber( input ):
> ? ? try:
> ? ? ? ? if '.' in input:
> ? ? ? ? ? ? num = float( input )
> ? ? ? ? else:
> ? ? ? ? ? ? num = int( input )
> ? ? ? ? return True
>
> ? ? except ValueError:
> ? ? ? ? return False
>
> if __name__ == '__main__':
> ? ? tests = """
> ? ? ? ? 12
> ? ? ? ? -12
> ? ? ? ? -12.34
> ? ? ? ? .0
> ? ? ? ? .
> ? ? ? ? 1 2 3
> ? ? ? ? 1 . 2
> ? ? ? ? just text
> ? ? """
>
> ? ? for test in tests.split( '\n' ):
> ? ? ? ? print 'test (%0s), isnumber: %1s' % \
> ? ? ? ? ? ( test.strip(), isnumber( test ) )
>
> </code>

Their is a good answer given on Rosetta Code here:
  http://www.rosettacode.org/wiki/IsNumeric#Python

- Paddy.


From laplacian42 at gmail.com  Tue Feb 17 02:02:19 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 23:02:19 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.89.1234851668.11746.python-list@python.org>
Message-ID: <ea29bdf1-0bf7-433f-bc81-51a3202d2cd5@p20g2000yqi.googlegroups.com>

On Feb 17, 1:21?am, Python Nutter <pythonnut... at gmail.com> wrote:
> > Note: spelling is "OcempGUI". Also, since google broke some of the
> > links,
> > here's that main link again:
>
> Thats my bad or more to the point my iPhone bad, typing fast with
> spellcheck changes words to real dictionary words.
>
> > Well, to be fair, SDL is pretty commonly-used software and they offer
> > binary downloads for Mac OS X and MS Windows. Pygame seems to provide
> > the same. So, installation should be a breeze.
>
> Not on Mac. To get SDL, PyObjC, PyGame and other dependencies
> installed on the platform you are talking on downloading and
> installing close to 50MB+ of packages before you get to the point
> where you install the OcempGUI package.

Funny you should mention this. I'd just been getting it installed on a
Mac I have access to. Here's what it took:

1. Install a Python from python.org. Something about the Pygame
installer not wanting to use the system Python. Also, it wants v2.5.
Ok. (As an aside, that's about 19 MB.) This is a mpkg file in a dmg,
so the install is trivial.

2. Now SDL. This one is just a drag-and-drop to your `/Library/
Frameworks` folder. Easy, but the user will have to look into the
README to know what to do. (1 MB)

3. Now PyObjC. Another mpkg file. It's available at the pygame site.
(6 MB)

4. Pygame. An mpkg in a zip file. (9 MB)

5. Whoops. Surprise. NumPy is required. mpkg in a dmg. (3 MB)

6. Finally, OcempGUI. This is a `sudo python setup.py install`. (4 MB)

That's 42 MB all told, admin rights required, and the examples are
running. Pretty neat.

> Thats a lot to ask of a user

[sigh] Probably. Unless maybe all the prereq's were gathered together
with a script to run through and install them all one after another.

> just to run my one program on their
> system.

Well, it will allow them to run *any* OcempGUI program thereafter, but
I see your point.

> If it was just myself and I wanted to go through the process
> for educational/self-benefit I wouldn't mind. But TkInter is already installed (0 dependencies) and on every Mac out
> there

Just tried that. Didn't know it was all installed (Tcl/Tk too) and
ready to go. Wow that's pretty darn convenient.

> I also have this sneaking suspicion that the BDFL is secretly on the
> sidelines waiting for the Tk tile theming engine to mature as if it
> does and becomes standard in Python distributions I would say the
> justification for learning wx and qt would be diminished by an unknown
> quantity.
>

Aye.


From bj_666 at gmx.net  Tue Feb 17 02:26:28 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 17 Feb 2009 07:26:28 GMT
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <6vv754Flqs0mU1@mid.uni-berlin.de>

On Mon, 16 Feb 2009 23:21:16 -0600, Yuanxin Xi wrote:

> I'm having some problems with the memory recycling/garbage collecting of
> the following testing code:
> 
>>>> a=[str(i) for i in xrange(10000000)]
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
> 
>>>> b={}
>>>> for i in xrange(10000000):
> ...     b[str(i)]=i
> 
> Then the memory usage increased to 1726m/1.6g/2048
> 
>>>> del b
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
> 
> Could anyone please explain why this happens?  It seems some memory are
> not freed.

It seems the memory is not given back to the operating system.  This 
doesn't mean that it is not freed by Python and can't be used again by 
Python.  Create the dictionary again and see if the memory usage rises 
again or if it stays stable.

Ciao,
	Marc 'BlackJack' Rintsch


From testisok at gmail.com  Tue Feb 17 02:34:29 2009
From: testisok at gmail.com (testisok)
Date: Mon, 16 Feb 2009 23:34:29 -0800 (PST)
Subject: Thread control in thread pool for sending
Message-ID: <baad6eee-8e47-4df4-ad0f-c4c25681dd21@r15g2000prd.googlegroups.com>

Hi, all:

     Here is a thread pool for sending as a client, all blocked at
Semaphore.
     How can I choose these threads that is idle for some time and
then send heartbeat messages to the server thru sockets of these
threads?

Thanks in advance.
Best wishes


From regebro at gmail.com  Tue Feb 17 02:52:20 2009
From: regebro at gmail.com (Lennart Regebro)
Date: Tue, 17 Feb 2009 08:52:20 +0100
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
	<ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
Message-ID: <319e029f0902162352l13da07b8r8b0aafba66e4e7a3@mail.gmail.com>

On Tue, Feb 17, 2009 at 00:50, Guido van Rossum <guido at python.org> wrote:
> Can you explain the difficulty with porting setuptools in more detail?

Oh, it just exposes a bug in distutils. It probably means I'll have to
make a test for python version, and if it is 3.0.1, monkey-patch
distutils. I haven't really looked into if there is any other
possibilities yet, I'm concentrating to make it run for 3.1 trunk
first.

-- 
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64


From grflanagan at gmail.com  Tue Feb 17 03:17:41 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 17 Feb 2009 08:17:41 +0000
Subject: flexible find and replace ?
In-Reply-To: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <gndrr6$c6f$1@ger.gmane.org>

OdarR wrote:
> Hi guys,
> 
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
> 
> ".......TAG............TAG................TAG..........TAG....."
> 
> is replaced by this :
> 
> ".......REPL01............REPL02................REPL03..........REPL04..."
> 
> 
> A better and clever method than this snippet should exist I hope :
> 
> counter = 1
> while 'TAG' in mystring:
>     mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
>     counter+=1
>     ...
> 
> (the find is always re-starting at the string beginning, this is not
> efficient.
> 
> any ideas ? thanks,
> 

The first thing that comes to mind is re.sub:

import re

def replace(s, patt, repls):
     def onmatch(m):
         onmatch.idx += 1
         return repls[onmatch.idx]
     onmatch.idx = -1
     return patt.sub(onmatch, s)

test = """
abcTAG TAG asdTAGxyz
"""

REPLS = [
     'REPL1',
     'REPL2',
     'REPL3',
     ]

print replace(test, re.compile('TAG'), REPLS)



From duncan.booth at invalid.invalid  Tue Feb 17 03:18:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 08:18:12 GMT
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com>
Message-ID: <Xns9BB554614CFC8duncanbooth@127.0.0.1>

John Machin <sjmachin at lexicon.net> wrote:

> def fancyrepl(tag, replfunc, input_string):
>     count = 0
>     pieces = []
>     pos = 0
>     taglen = len(tag)
>     while 1:
>         try:
>             newpos = input_string.index(tag, pos)
>         except ValueError:
>             pieces.append(input_string[pos:])
>             return ''.join(pieces)
>         pieces.append(input_string[pos:newpos])
>         count += 1
>         pieces.append(replfunc(count))
>         pos = newpos + taglen
> 

Or even:

import re, itertools
def fancyrepl(tag, replfunc, input_string):
	counter = itertools.count(1)
	return re.sub(re.escape(tag),
         lambda m: replfunc(counter.next()), input_string)

which does exactly the same thing in rather less code.

-- 
Duncan Booth http://kupuguy.blogspot.com


From jldunn2000 at googlemail.com  Tue Feb 17 03:21:38 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 17 Feb 2009 00:21:38 -0800 (PST)
Subject: Get file name from file handle
Message-ID: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>

Is there anyway, having been passed a file handle, to get the
filename?

I am assuming not, but thought I would ask



From noprianto at gmail.com  Tue Feb 17 03:28:13 2009
From: noprianto at gmail.com (Noprianto)
Date: Tue, 17 Feb 2009 15:28:13 +0700
Subject: Get file name from file handle
In-Reply-To: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <8f0de1f0902170028r7d44da83p132e99a41dcbc68d@mail.gmail.com>

On 2/17/09, loial <jldunn2000 at googlemail.com> wrote:
>
> Is there anyway, having been passed a file handle, to get the
> filename?
>
> I am assuming not, but thought I would ask


>>> a = open('/etc/passwd')
>>> a.name
'/etc/passwd'
>>>

Best regards,
Nop
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From castironpi at gmail.com  Tue Feb 17 03:33:27 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 17 Feb 2009 00:33:27 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>

On Feb 16, 11:21?pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
> I'm having some problems with the memory recycling/garbage collecting
> of the following testing code:
>
> >>> a=[str(i) for i in xrange(10000000)]
>
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>
> >>> b={}
> >>> for i in xrange(10000000):
>
> ... ? ? b[str(i)]=i
>
> Then the memory usage increased to 1726m/1.6g/2048
>
> >>> del b
>
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
snip

'gc.collect()' -- I believe, but I'm not the specialist in it.



From gagsl-py2 at yahoo.com.ar  Tue Feb 17 03:34:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 06:34:46 -0200
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>
Message-ID: <op.uphl38cpx6zn5v@gabriel.sleipnir-bsas>

En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanvick at gmail.com> escribi?:
> On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
>> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>>
>> > I have a Python v2.5.2 server running and I found some undesirable
>> > behavior in the xmlrpclib module that is included with that version of
>> > Python. ?The xmlrpclib version that is included with Python 2.6
>> > changes the behavior for the better. ?I nervous about upgrading my
>> > Python install to 2.6 on this server because I remember reading in the
>> > docs of a library I use that it targets the 2.5 branch. ?What is the
>> > best way to only upgrade the xmlrpclib in my 2.5 install?
>> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
>> and 2.6, only significant differences I see are checks for True/False
>> as builtins left over from pre-2.4 and some datetime handling.
> The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
> custom objects.  It checks the type of my object, and if it isn't in a
> hard-coded list of types, then a "Cannot marshal object of <type>
> type" exception message shows up.  The version in my Windows 2.6
> install has a fall back case where if the type is not in the hard-
> coded list, it simply calls Object.__dict__ to get a graph of the
> object's values that can be marshaled into xmlrpc.
>
> I am using xmlrpc through Pylons.  As a workaround, instead of
> returning my custom objects in my xmlrpc server functions, I return
> MyObject.__dict__
>
> I also did not see anything in the revision log in the source file
> about this change.

It was rev.52790: http://svn.python.org/view?rev=52790&view=rev
The tracker item has some background: http://bugs.python.org/issue1070046

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Feb 17 03:40:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 17 Feb 2009 00:40:29 -0800
Subject: memory recycling/garbage collecting problem
In-Reply-To: <b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
Message-ID: <50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>

On Tue, Feb 17, 2009 at 12:33 AM, Aaron Brady <castironpi at gmail.com> wrote:
> On Feb 16, 11:21 pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
>> I'm having some problems with the memory recycling/garbage collecting
>> of the following testing code:
>>
>> >>> a=[str(i) for i in xrange(10000000)]
>>
>> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>>
>> >>> b={}
>> >>> for i in xrange(10000000):
>>
>> ...     b[str(i)]=i
>>
>> Then the memory usage increased to 1726m/1.6g/2048
>>
>> >>> del b
>>
>> I expect the memory usage drop to the ammount before b was
>> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
> snip
>
> 'gc.collect()' -- I believe, but I'm not the specialist in it.

If I understand correctly, that only effects objects that are part of
a reference cycle and doesn't necessarily force the freed memory to be
released to the OS.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From grflanagan at gmail.com  Tue Feb 17 03:49:25 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 17 Feb 2009 08:49:25 +0000
Subject: flexible find and replace ?
In-Reply-To: <gndrr6$c6f$1@ger.gmane.org>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<gndrr6$c6f$1@ger.gmane.org>
Message-ID: <gndtml$i5j$1@ger.gmane.org>

Gerard Flanagan wrote:
> 
> def replace(s, patt, repls):
>     def onmatch(m):
>         onmatch.idx += 1
>         return repls[onmatch.idx]
>     onmatch.idx = -1
>     return patt.sub(onmatch, s)
> 

> test = """
> abcTAG TAG asdTAGxyz
> """
> 
> REPLS = [
>     'REPL1',
>     'REPL2',
>     'REPL3',
>     ]
> 
> print replace(test, re.compile('TAG'), REPLS)
> 
> -- 

or better:

import re

def replace(s, patt, repls):
     repls = iter(repls)
     return patt.sub(lambda m: repls.next(), s)

test = """
abcTAG TAG asdTAGxyz
"""

def repls(tag):
     i = 0
     while True:
         i += 1
         yield tag + str(i)

print replace(test, re.compile('TAG'), repls('REPL'))



From duncan.booth at invalid.invalid  Tue Feb 17 03:55:54 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 08:55:54 GMT
Subject: Get file name from file handle
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <Xns9BB55AC4F7A27duncanbooth@127.0.0.1>

loial <jldunn2000 at googlemail.com> wrote:

> Is there anyway, having been passed a file handle, to get the
> filename?
> 
> I am assuming not, but thought I would ask
> 
> 
If you mean a Python file object then file.name (but it may not exist on 
all file objects).

If you mean a system file handle, then which filename would you like? On 
many filesystems the file exists independantly from the filenames, so a 
single file can have many names or none at all. On Linux you can use 
os.fstat() to get the inode number for the file but I think you would have 
to scan the relevant directories to find the names associated with the 
inode.

-- 
Duncan Booth http://kupuguy.blogspot.com


From mirko.dziadzka at gmail.com  Tue Feb 17 04:03:29 2009
From: mirko.dziadzka at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 10:03:29 +0100
Subject: print string as raw string
Message-ID: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>

Hi all

I'm trying to find a way to output strings in the raw-string format, e.g.

print_as_raw_string(r"\.") should output r"\." instead of "\\."

Is there a better way than writing your own print function? Some magic
encoding?


    Mirko



From tim.wintle at teamrubber.com  Tue Feb 17 04:05:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 17 Feb 2009 09:05:49 +0000
Subject: Speedup Bitmap Parser
In-Reply-To: <12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
Message-ID: <1234861549.6114.9.camel@tim-laptop>

On Mon, 2009-02-16 at 16:47 -0800, bearophileHUGS at lycos.com wrote:
> Jayson Santos:
> > Do I need use some patters or others progamming conventions ?
> 
> That's a strong question...
> Knowing OOP well is important, and it's often a good way to program,
> etc. But... You may try to rewrite your code with functions only and
> no classes (well, you may need to use classes for the TK gui).
> Feel free to not follow this suggestion of mine. Even if you follow
> it, it will not damage your brain :-)

I'd strongly agree with the above - object creation is overkill in
inner-loops.

Invoking functions and any kind of variable allocation is also going to
slow it down. That's what bearophile's previous comment about accessing
line.colors without the "." lookup by enumerating them was about.

At the end of the day, image manipulation is often better left to C (or
compiled extensions to python in Cython etc.) than done in Python - it's
just too tough to do pointer-magic in Python. You may find that so much
time is being spent by your application in the ".create_line" method
that there's no other option - I'd highly recommend PIL though.


Tim Wintle



From bieffe62 at gmail.com  Tue Feb 17 04:15:40 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Tue, 17 Feb 2009 01:15:40 -0800 (PST)
Subject: Get file name from file handle
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <9ccf2d4f-6c5e-49a0-b0c2-905f246e9cc9@r41g2000yqm.googlegroups.com>

On Feb 17, 9:21?am, loial <jldunn2... at googlemail.com> wrote:
> Is there anyway, having been passed a file handle, to get the
> filename?
>
> I am assuming not, but thought I would ask

If by file handle you mean the object returned by 'file' and 'open'
functions, it has a name attribute.
If by file handle you mean the file descriptor, i.e. the integer used
for low level I/O, then there is no
way I know of. I believe that number is an index in an array of 'file
descriptors' somewhere inside the
C library ( below python interpreter level ), but I don't know if/how
an user program can access it.

Ciao
----
FB


From mail at microcorp.co.za  Tue Feb 17 04:18:36 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 17 Feb 2009 11:18:36 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
Message-ID: <014201c990e2$fb49dba0$0d00a8c0@hendrik>

"Aahz" <aahz at py....aft.com> wrote:


> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <ma....orp.co.za> wrote:
> >
> >Occam was the language that should have won the marketing prize, but
> >didn't.
> 
> It wasn't simple enough.

I thought (at the time) that it was quite good at hiding some
horrible complexities of communication between different
processes on the same, and different processors.

All done by the compiler, automagically.

I think now that a hard look at the underlying techniques
used then could add something to the debate referred to
earlier - but there may be a barrier because the dataflow
or systolic array type programming model is not one
that is currently fashionable.

- Hendrik




From bearophileHUGS at lycos.com  Tue Feb 17 04:27:04 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 01:27:04 -0800 (PST)
Subject: pythonic array subsetting
References: <mailman.88.1234851441.11746.python-list@python.org>
Message-ID: <32c50024-2bb3-4fd4-bedb-c995e4ce97cb@f3g2000yqf.googlegroups.com>

Nick Matzke:
> I have to do this hundreds of times, so speed would be useful.

Try to create a 2D array with NumPy, and then slice it. Note that
slicing syntax has a "stride" too.

Bye,
bearophile


From mail at microcorp.co.za  Tue Feb 17 04:27:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 17 Feb 2009 11:27:54 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org><gndb96$97u$1@panix3.panix.com>
	<87fxidohk6.fsf@benfinney.id.au>
Message-ID: <014301c990e2$fbe0eb80$0d00a8c0@hendrik>

"Ben Finney" <bignose+hates-spam at benfinney.id.au> wrote:

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <mail at microcorp.co.za> wrote:
> >Occam was the language that should have won the marketing prize,
> >but didn't.
> 
> It wasn't simple enough.

*bdom-tsssh* <URL:http://en.wikipedia.org/wiki/Occam's_razor>

If Aahz was trolling, then he got me. I know about William of Occam,
after whom the language was named, and his razor, but did not make
the association, and answered seriously.

If you play with razor blades, you get cut.
:-)

- Hendrik




From gagsl-py2 at yahoo.com.ar  Tue Feb 17 05:05:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 08:05:42 -0200
Subject: Need an application sends from paricular port
References: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
	<9e680b420902162144o69e86806wd80383579e21d333@mail.gmail.com>
Message-ID: <op.uphqbsj3x6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 03:44:51 -0200, Sambit Samal <sambit2005 at gmail.com>  
escribi?:

>> I am new to Python world
>>
>>  I need a python script , which binds at a user defind port & sends to
>> other enity , which waits at particular port.
>> The other enity will respond & Python script should receive that at the
>> defined port
>>
>> The communication will happen over UDP

(I'm rather sure I replied to your first request, but I cannot find my own  
post anywhere, so I'll try again)

See the SocketServer module:  
http://docs.python.org/library/socketserver.html -- you may want to use  
ForkingUDPServer or ThreadingUDPServer. There is a client/server example  
at the end.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Feb 17 05:17:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 08:17:37 -0200
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
Message-ID: <op.uphqvne6x6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 03:04:23 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> io.TextIOWrapper object; but I want to output bytes
>   (e.g. muscript -midi t > t.mid )
> and they're coming out stringified :-(  How can I either change the
> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> mode, or dup(fd) it first, or whatever the right thing to do is ?

I cannot test this with Python 3 right now, but I think this should work  
(right at the start of your script):

sys.stdout = os.fdopen(sys.stdout.fileno(), 'wb')

-- 
Gabriel Genellina



From tino at wildenhain.de  Tue Feb 17 05:33:56 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 17 Feb 2009 11:33:56 +0100
Subject: print string as raw string
In-Reply-To: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <499A9294.2050505@wildenhain.de>

Mirko Dziadzka wrote:
> Hi all
> 
> I'm trying to find a way to output strings in the raw-string format, e.g.
> 
> print_as_raw_string(r"\.") should output r"\." instead of "\\."
> 
> Is there a better way than writing your own print function? Some magic
> encoding?

Thats nonsense. print r"\." or in python3.0 print(r"\.")
will just print:
\.

Regards
Tino
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From deets at nospam.web.de  Tue Feb 17 05:39:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 11:39:48 +0100
Subject: print string as raw string
In-Reply-To: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <6vvifkFm4k0vU1@mid.uni-berlin.de>

Mirko Dziadzka schrieb:
> Hi all
> 
> I'm trying to find a way to output strings in the raw-string format, e.g.
> 
> print_as_raw_string(r"\.") should output r"\." instead of "\\."
> 
> Is there a better way than writing your own print function? Some magic
> encoding?

There is no need to do this. Rawstrings are only different wrt to their 
parsing, the resulting string is the exact same.

r"\foo" == "\\foo"
type(r"\foo") == type("\\foo")

So there is no way to write something that distinguishes them.


Can it be that you are fooled by the repr() of strings in the interpreter?

 >>> r"\foo"
'\\foo'

This is nothing to worry about, it's just the interpreter doing an 
implicit repr-call for the objects it displays.

If instead you'd do

 >>> print r"\foo"
\foo

you get what you want.


Diez


From andrew at acooke.org  Tue Feb 17 06:34:39 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 08:34:39 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <014201c990e2$fb49dba0$0d00a8c0@hendrik>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
	<014201c990e2$fb49dba0$0d00a8c0@hendrik>
Message-ID: <ee0b0a41ff92bd2f900391860eaad09c.squirrel@localhost>


why do you think that current work is ignorant of occam?  occam itself was
based on hoare's "communicating sequential processes" which is a classic
of the field.  the ideas behind occam are not unknown and it hasn't been
forgotten (there are many libraries based on synchronous message passing;
one for java called jcsp for example -
http://www.cs.kent.ac.uk/projects/ofa/jcsp/ ; the "rendezvous model"
(receiving tasks wait for messages) is used in ada).

but really it did very little to hide the complexities of parallel
computing - it's famous because it (and the transputer platform) was one
of the first languages to take parallelism "seriously", not because it
presented any kind of silver bullet (more generally, it was a pretty crude
language, more suited to small embedded applications than large projects -
it didn't even have dynamically sized arrays)

there's a comment here http://lambda-the-ultimate.org/node/2437 that shows
the limitations of occam: "I used Occam (the transputer implementation of
CSP) very heavily in the 1980s and early 1990s, and eventually started
referring to channels as "the return of the GOTO", since in any moderately
complex application, you spent a lot of time wondering, "If I put bytes in
*here*, who will they go to?" Addressable actors and/or tuple spaces both
felt much more scalable (in the coding sense)."

(disclaimer - i haven't used it personally.  once i was asked to maintain
an occam system, but somehow managed to dodge the responsibility)

if you look at erlang, which is one of the more successful parallel
languages at the moment, you'll see some similarity to occam (message
passing is explicit), but shifting to asynchronous messages helps give a
more robust system.

andrew


Hendrik van Rooyen wrote:
> "Aahz" <aahz at py....aft.com> wrote:
>
>
>> In article <mailman.52.1234797812.11746.python-list at python.org>,
>> Hendrik van Rooyen <ma....orp.co.za> wrote:
>> >
>> >Occam was the language that should have won the marketing prize, but
>> >didn't.
>>
>> It wasn't simple enough.
>
> I thought (at the time) that it was quite good at hiding some
> horrible complexities of communication between different
> processes on the same, and different processors.
>
> All done by the compiler, automagically.
>
> I think now that a hard look at the underlying techniques
> used then could add something to the debate referred to
> earlier - but there may be a barrier because the dataflow
> or systolic array type programming model is not one
> that is currently fashionable.
>
> - Hendrik
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From bruno.42.desthuilliers at websiteburo.invalid  Tue Feb 17 06:38:43 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 17 Feb 2009 12:38:43 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <499aa1bb$0$29487$426a74cc@news.free.fr>

rushenaly at gmail.com a ?crit :
(snip)
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. 

I'm surprised no one here corrected that point yet, so here we go: yes, 
Python does support multithreading. The fact that threads won't be 
executed concurrently on a multicore machine (due to the GIL) is a 
different problem (cf Andrew Cooke's answer on this - and his advice to 
study Erlang if you want to do concurrent programming).



From mirko-usenet-200902 at gmail.com  Tue Feb 17 06:54:01 2009
From: mirko-usenet-200902 at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 12:54:01 +0100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
Message-ID: <slrngpl9ap.5jn.mirko-usenet-200902@dziadzka.de>

Diez B. Roggisch <deets at nospam.web.de>  wrote:
>> I'm trying to find a way to output strings in the raw-string format, e.g.
>> 
>> print_as_raw_string(r"\.") should output r"\." instead of "\\."
>> 
>> Is there a better way than writing your own print function? Some magic
>> encoding?
>
> There is no need to do this. Rawstrings are only different wrt to their 
> parsing, the resulting string is the exact same.

I know. 

Maybe a little bit more eplaination from my site.  I'm going to generate
python source which contains lot of regex-strings and I want this code
to be easy readable and editable. 
In fact, editing these regexes is the main reason for exporting them.  

So I would prefer the more compact and readable raw-string notation
instead of the smantic equivalent string notation.

So I'm going to write these couple of lines to convert a string in this
raw-string format.

Greetings

    Mirko


-- 
"In C we had to code our own bugs. In C++ we can inherit them."  


From andrew at acooke.org  Tue Feb 17 06:58:38 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 08:58:38 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <499aa1bb$0$29487$426a74cc@news.free.fr>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<499aa1bb$0$29487$426a74cc@news.free.fr>
Message-ID: <860a74f95b30bd61dfa6240dc70bbf9e.squirrel@localhost>

Bruno Desthuilliers wrote:
> rushenaly at gmail.com a ?crit :
> (snip)
>> And the story begins here. As i search on the net,  I have found that
>> because of the natural characteristics of python such as GIL, we are
>> not able to write multi threaded programs.
>
> I'm surprised no one here corrected that point yet, so here we go: yes,
> Python does support multithreading. The fact that threads won't be
> executed concurrently on a multicore machine (due to the GIL) is a
> different problem (cf Andrew Cooke's answer on this - and his advice to
> study Erlang if you want to do concurrent programming).

ah, sorry, i noticed this last night in another comment from rushenaly,
but forgot to say anything.

in case it's still not clear: you can have threads even on a single core. 
this is done by "time slicing" - some cpu time is given to one thread,
then to another.

exactly who does the slicing can vary.  in the case of a gui (which is
what i was about to explain last night then got distracted) it's quite
common for the gui library itself to do the scheduling of work.  so even
though the gui library uses a single thread, it can update several
windows, handle user input, etc "in parallel".  the next level is that the
language itself does the scheduling - that's what is commonly called
"threads".  finally the operating system can share things out (and that's
called processes).  but these are all basically the same thing, can happen
on a single core, and are not affected by the GIL (i have simplified
above; threads can also be a service that the operating system provides to
a language)

andrew




From mirko.dziadzka at gmail.com  Tue Feb 17 07:03:16 2009
From: mirko.dziadzka at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 13:03:16 +0100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <slrngpl9s4.612.mirko-usenet-200902@dziadzka.de>

Mirko Dziadzka <mirko.dziadzka at gmail.com>  wrote:
> Hi all
>
> I'm trying to find a way to output strings in the raw-string format, e.g.
>
> print_as_raw_string(r"\.") should output r"\." instead of "\\."

Ok, lets make a better example:

>>> re_list = {}
>>> re_list['foo'] = r'\..*'
>>> re_list['bar'] = r'.*bar.*'
>>> print re_list
{'foo': '\\..*', 'bar': '.*bar.*'}

I would like to see a:
{'foo': r'\..*', 'bar': '.*bar.*'}


Greetings

    Mirko


-- 
"Never attribute to malice what can be equally explained by stupidity." 


From steve at pearwood.info  Tue Feb 17 07:09:50 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:09:50 +1100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
Message-ID: <01aa9ea5$0$20632$c3e8da3@news.astraweb.com>

Nicolas Dandrimont wrote:

> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
> 
> (No, I did not forget to indent the else statement, see
> http://docs.python.org/reference/compound_stmts.html#for)

That might be better written as:

char_found = False
for char in word:
    if char in 'aeiouAEIUO':
        char_found = True
        break

or even:

char_found = False
for char in word:
    if char.lower() in 'aeiou':
        char_found = True
        break

but if word is potentially very large, it's probably better to reverse the
test: rather than compare every char of word to see if it is a vowel, just
search word for each vowel:

char_found = any( vowel in word for vowel in 'aeiouAEIOU' )

This moves the for-loop out of slow Python into fast C and should be much,
much faster for very large input.


-- 
Steven



From steve at pearwood.info  Tue Feb 17 07:21:16 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:21:16 +1100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
Message-ID: <01aaa153$0$20629$c3e8da3@news.astraweb.com>

Diez B. Roggisch wrote:

> Mirko Dziadzka schrieb:
>> Hi all
>> 
>> I'm trying to find a way to output strings in the raw-string format, e.g.
>> 
>> print_as_raw_string(r"\.") should output r"\." instead of "\\."
>> 
>> Is there a better way than writing your own print function? Some magic
>> encoding?
> 
> There is no need to do this. 

How do you know? Perhaps the OP is writing a test suite where he needs to
confirm that tens of thousands of raw strings are converted correctly, and
he'd rather write a Python script to generate those raw strings than to
type them up by hand. In this case though, the OP would be better off
generating the raw strings systematically, rather than trying to go
backwards.

In any case, this is just a variation of what repr() does.

>>> repr(r'\.')
"'\\\\.'"

What the OP seems to want is something like:

>>> raw_repr('\\\\.')  # or r'\.' or '\x5c.' etc.
"r'\.'"


I don't think that's necessarily a silly function to have, although what it
is useful for (apart from my contrived example above), I don't know.

Here is a barely tested version:

def raw_repr(s):
    """Return the repr of string s as a raw-string."""
    r = repr(s)
    if '\\\\' in r:
        r = "r" + r.replace('\\\\', '\\')
    assert not r.endswith('\\')
    return r


>>> raw_repr('\x5c.')
"r'\\.'"
>>> print raw_repr('\x5c.')
r'\.'



-- 
Steven



From steve at pearwood.info  Tue Feb 17 07:23:32 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:23:32 +1100
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
Message-ID: <01aaa1da$0$20629$c3e8da3@news.astraweb.com>

Roy Smith wrote:

>> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
>> > and SyntaxError?
> 
> Absolutely.  Let's take my example -- you're writing software for a Mars
> Rover.  I have no idea how you might get a MemoryError, but let's say you
> do.  Which would you rather do, perform a system reset, or print a stack
> trace and wait for a friendly Martian to come along and reboot you?
> 
> You may think I'm being silly, but I'm dead serious.  The many layers of
> "It's impossible for this to happen, but if it does let's do something to
> try and recover" processing saved that mission several times over.  In
> some applications, there's no such thing as "halt".

Okay, but that surely falls under chapter 18 of the "Advanced Python
Programming for the Mars Rover" book rather than chapter 5 of "Newbies
Guide to Python".

In general, the right thing to do for unexpected exemptions is to let them
halt the program so you can find out about them and fix the bug, not to
hide the exception. There may be exceptions (pun intended) to this general
principle, but they're fairly unusual.


-- 
Steven



From newptcai at gmail.com  Tue Feb 17 07:27:25 2009
From: newptcai at gmail.com (=?GB2312?B?0rvK18qr?=)
Date: Tue, 17 Feb 2009 04:27:25 -0800 (PST)
Subject: Is there something easier than ORM?
Message-ID: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>

Hi all,

Recently I am studying some python ORM libraries, such as sqlalchemy.

These are very powerful technologies to handle database.  But I think
my project are not complicated to enough to benefit from a complete
ORM system.

What I really want, is some easy ways to load data from database, and
change rows of data to list of named tuple, then I could send these
data to my client application.

I don't think I want these subtle behavior such as lazy load, auto
update, ect. in ORM.

So is there some libraries like that?

Or is there some tools that could generate code from database scheme
as I want?


From lists at cheimes.de  Tue Feb 17 07:28:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 13:28:01 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <slrngpkhao.3ri.peter@box8.pjb.com.au>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
Message-ID: <gneagh$s38$1@ger.gmane.org>

Peter Billam schrieb:
> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> io.TextIOWrapper object; but I want to output bytes
>   (e.g. muscript -midi t > t.mid )
> and they're coming out stringified :-(  How can I either change the
> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> mode, or dup(fd) it first, or whatever the right thing to do is ?

The official API to write binary data to stdout is:

>>> count = sys.stdout.buffer.write(b"abc\n")
abc

Christian



From smartpawn at gmail.com  Tue Feb 17 07:31:38 2009
From: smartpawn at gmail.com (Deepak Rokade)
Date: Tue, 17 Feb 2009 18:01:38 +0530
Subject: listing files by modification time
Message-ID: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>

Hi,

I am using python 2.5 on sun solaris.

I want to limit the number of files returned by os.listdir() to some number
(say 1000), how can I do it ?

Also I wan to list the files only if they are older than some x days, how
can I do it?

I can do this through shell script using command.



find ${ DIR_PATH} -mtime +`expr ${PERIOD} - 1` -type f -exec ls  -l {} \;



I want to have similar functionality like above through python. I don't want
to list the whole files in directory and go to each file for checking it's
modification time.

I am thankful for any pointer.


-- 
Thanx & Regards,
Deepak Rokade

Do what u Enjoy &
               Enjoy what u Do...........
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From clp2 at rebertia.com  Tue Feb 17 07:36:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 17 Feb 2009 04:36:52 -0800
Subject: listing files by modification time
In-Reply-To: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
Message-ID: <50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:31 AM, Deepak Rokade <smartpawn at gmail.com> wrote:
> Hi,
>
> I am using python 2.5 on sun solaris.
>
> I want to limit the number of files returned by os.listdir() to some number
> (say 1000), how can I do it ?
>
> Also I wan to list the files only if they are older than some x days, how
> can I do it?

You can filter the returned list of files by checking the results of
os.stat() [http://docs.python.org/library/os.html#os.stat] on the
files. The `stat` module [http://docs.python.org/library/stat.html]
can help with the interpretation of the data returned from os.stat().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From n.kottiyath at gmail.com  Tue Feb 17 07:40:33 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Tue, 17 Feb 2009 04:40:33 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <f4397092-2258-4cee-af5e-4dee5cea995a@w39g2000prb.googlegroups.com>



??? wrote:
> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

If ORM is not used, you might have to contend with different tools for
different databases - and will have to write SQL commands.
Luckily everything follows DB-API2 properly. http://www.python.org/dev/peps/pep-0249/.
So you mostly dont have to change the commands to access DB.

For the different tools, this http://wiki.python.org/moin/DatabaseInterfaces
might be a good starting point.
For example - psycopg2 for postgresql is almost the default etc.


From sjmachin at lexicon.net  Tue Feb 17 08:02:34 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 17 Feb 2009 05:02:34 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com> 
	<Xns9BB554614CFC8duncanbooth@127.0.0.1>
Message-ID: <917e504a-47dc-4ac3-b2ae-72d5cfb6d7df@m29g2000prd.googlegroups.com>

On Feb 17, 7:18?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> John Machin <sjmac... at lexicon.net> wrote:
> > def fancyrepl(tag, replfunc, input_string):
> > ? ? count = 0
> > ? ? pieces = []
> > ? ? pos = 0
> > ? ? taglen = len(tag)
> > ? ? while 1:
> > ? ? ? ? try:
> > ? ? ? ? ? ? newpos = input_string.index(tag, pos)
> > ? ? ? ? except ValueError:
> > ? ? ? ? ? ? pieces.append(input_string[pos:])
> > ? ? ? ? ? ? return ''.join(pieces)
> > ? ? ? ? pieces.append(input_string[pos:newpos])
> > ? ? ? ? count += 1
> > ? ? ? ? pieces.append(replfunc(count))
> > ? ? ? ? pos = newpos + taglen
>
> Or even:
>
> import re, itertools
> def fancyrepl(tag, replfunc, input_string):
> ? ? ? ? counter = itertools.count(1)
> ? ? ? ? return re.sub(re.escape(tag),
> ? ? ? ? ?lambda m: replfunc(counter.next()), input_string)
>
> which does exactly the same thing

Not exactly; mine needs
    taglen = max(1, len(tag))
to stop an infinite loop when len(tag) == 0.

> in rather less code.

and with rather less execution speed [measured at about half] and
rather less OP-explanation speed [guessed] :-)


From deets at nospam.web.de  Tue Feb 17 08:24:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 14:24:43 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <6vvs4rFlvitlU1@mid.uni-berlin.de>

??? schrieb:
> Hi all,
> 
> Recently I am studying some python ORM libraries, such as sqlalchemy.
> 
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
> 
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
> 
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
> 
> So is there some libraries like that?
> 
> Or is there some tools that could generate code from database scheme
> as I want?


Sqlalchemy. You don't need to use the ORM-layer, and you can use 
reflection to create schema-objects like tables.

Then you can use that to create SQL-queries simple & powerful, whilst 
being DB-agnostic and having a road to start using the ORM if you 
discover it is useful for you.

To be honest: if you can control the schema, I'd still go for an orm. I 
for example use elixir. It makes the easy things *really* easy, and the 
complicated ones ar still possible.


Diez


From michele.simionato at gmail.com  Tue Feb 17 08:37:43 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 05:37:43 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <2aadd0f4-37a8-4e65-a447-4ef1f44eba74@v39g2000yqm.googlegroups.com>

On Feb 17, 1:27 pm, ??? <newpt... at gmail.com> wrote:
> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

I think there is room for a poor man toolkit, something in between
SQLAlchemy and raw DB API.
However, I am not aware of any, and for the moment I am using a custom
made solution.


From santosdosreis at gmail.com  Tue Feb 17 08:47:07 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Tue, 17 Feb 2009 05:47:07 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
Message-ID: <5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>

On 16 fev, 21:47, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Do I need use some patters or others progamming conventions ?
>
> That's a strong question...
> Knowing OOP well is important, and it's often a good way to program,
> etc. But... You may try to rewrite your code with functions only and
> no classes (well, you may need to use classes for the TK gui).
> Feel free to not follow this suggestion of mine. Even if you follow
> it, it will not damage your brain :-)
>
> Bye,
> bearophile

Hello bearophile,
Thank you for all.
After changing my code to use only functions instead classes my code
is too much faster.
Here cProfile statistcs:
Using old code : 633608 function calls in 1.361 CPU seconds
Using new code: 475487 function calls in 0.800 CPU seconds

Best Regards
Jayson Reis


From stef.mientki at gmail.com  Tue Feb 17 08:58:24 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 17 Feb 2009 14:58:24 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable )  ?
Message-ID: <499AC280.80103@gmail.com>

hello,

I'm making a virtual machine,
in which (small) pieces of software (called bricks) are connected,
by connecting an output of a brick to the input of another brick.

A connection between 2 bricks may be of any type,
so it might be simple integer,
or a multi-nested dictionary / list or whatsoever .

Connections are made with the following statement (in simplified form)

Brick2.In = Brick2.Out

Now if the connection is a complex object, e.g. a list,
Brick2.In and Brick2.Out points to the same object,
and can automatically exchange information.

Now if the connection consists of a simple integer,
the statement Brick2.In = Brick2.Out
just assigns once a value to Brick2,
so there's no real communication anymore.
I solved that by adding modify-flags and receiver lists.

The problem is how can I determine
if a connection is a pointer or not ?
Which I'm not sure might be the same as mutable ?
( The type of connection need not be a standard Python type,
but might be any type created by the user. )

thanks,
Stef Mientki





From tim.wintle at teamrubber.com  Tue Feb 17 09:10:26 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 17 Feb 2009 14:10:26 +0000
Subject: memory recycling/garbage collecting problem
In-Reply-To: <50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
Message-ID: <1234879826.7672.11.camel@tim-laptop>

On Tue, 2009-02-17 at 00:40 -0800, Chris Rebert wrote: 
> >
> > 'gc.collect()' -- I believe, but I'm not the specialist in it.
> 
> If I understand correctly, that only effects objects that are part of
> a reference cycle and doesn't necessarily force the freed memory to be
> released to the OS.

I believe that's correct.

If the OP is worrying about memory usage then they should also be aware
that there are lots of very clever things done pre-assigning and keeping
hold of memory with python's in-built types to let them scale well that
can be confusing when you're looking at memory usage.

Basically malloc() and free() are computationally expensive, so Python
tries to call them as little as possible - but it's quite clever at
knowing what to do - e.g. if a list has already grown large then python
assumes it might grow large again and keeps hold of a percentage of the
memory.

The outcome is that trying to reduce memory usage can change what data
structures you should use - tupples use less space than lists, etc.

Tim W



From newptcai at gmail.com  Tue Feb 17 09:15:33 2009
From: newptcai at gmail.com (=?UTF-8?B?5LiA6aaW6K+X?=)
Date: Tue, 17 Feb 2009 06:15:33 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
Message-ID: <70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>

Thanks for your reply.

With sqlalchemy, an mapped must living in a session, you have no way
to disconnect it with its session.

For example :

#-------------------------------------
user = session.query(User).first()
session.expunge(user)
print user.name   #Error here
#-------------------------------------

I just want to get an read-only copy of user disconnected with session
to avoid  unexpected database operation.
But after expunge, properties of user is not accessible anymore.

BTW : why you choose elixir instead of sqlalchemy's own schema
definition style?
Doesn't including another library means more chances of bugs?

On Feb 17, 9:24?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> ??? schrieb:
>
>
>
> > Hi all,
>
> > Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> > These are very powerful technologies to handle database. ?But I think
> > my project are not complicated to enough to benefit from a complete
> > ORM system.
>
> > What I really want, is some easy ways to load data from database, and
> > change rows of data to list of named tuple, then I could send these
> > data to my client application.
>
> > I don't think I want these subtle behavior such as lazy load, auto
> > update, ect. in ORM.
>
> > So is there some libraries like that?
>
> > Or is there some tools that could generate code from database scheme
> > as I want?
>
> Sqlalchemy. You don't need to use the ORM-layer, and you can use
> reflection to create schema-objects like tables.
>
> Then you can use that to create SQL-queries simple & powerful, whilst
> being DB-agnostic and having a road to start using the ORM if you
> discover it is useful for you.
>
> To be honest: if you can control the schema, I'd still go for an orm. I
> for example use elixir. It makes the easy things *really* easy, and the
> complicated ones ar still possible.
>
> Diez



From smartpawn at gmail.com  Tue Feb 17 09:16:07 2009
From: smartpawn at gmail.com (Deepak Rokade)
Date: Tue, 17 Feb 2009 19:46:07 +0530
Subject: listing files by modification time
In-Reply-To: <50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
	<50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>
Message-ID: <48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>

Yes I can do that but for that I will have to go through entire list of
files and also I will have to first get the whole list of files present in
directory.

In case of my application this list can be huge and so want to list the
files which suits my criteria.
Similar to the unix find command I sent earlier or like below.

find /  -mtime +5 -type f -exec ls  -l {} \;

Otherwise can I limit the number of files in a list returned by os.listdir()
?



On Tue, Feb 17, 2009 at 6:06 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Tue, Feb 17, 2009 at 4:31 AM, Deepak Rokade <smartpawn at gmail.com>
> wrote:
> > Hi,
> >
> > I am using python 2.5 on sun solaris.
> >
> > I want to limit the number of files returned by os.listdir() to some
> number
> > (say 1000), how can I do it ?
> >
> > Also I wan to list the files only if they are older than some x days, how
> > can I do it?
>
> You can filter the returned list of files by checking the results of
> os.stat() [http://docs.python.org/library/os.html#os.stat] on the
> files. The `stat` module [http://docs.python.org/library/stat.html]
> can help with the interpretation of the data returned from os.stat().
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>



-- 
Thanx & Regards,
Deepak Rokade

Do what u Enjoy &
               Enjoy what u Do...........
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From deets at nospam.web.de  Tue Feb 17 09:17:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 15:17:33 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable
	)  ?
In-Reply-To: <mailman.109.1234879101.11746.python-list@python.org>
References: <mailman.109.1234879101.11746.python-list@python.org>
Message-ID: <6vvv7tFlvv6jU1@mid.uni-berlin.de>

Stef Mientki schrieb:
> hello,
> 
> I'm making a virtual machine,
> in which (small) pieces of software (called bricks) are connected,
> by connecting an output of a brick to the input of another brick.
> 
> A connection between 2 bricks may be of any type,
> so it might be simple integer,
> or a multi-nested dictionary / list or whatsoever .
> 
> Connections are made with the following statement (in simplified form)
> 
> Brick2.In = Brick2.Out
> 
> Now if the connection is a complex object, e.g. a list,
> Brick2.In and Brick2.Out points to the same object,
> and can automatically exchange information.
> 
> Now if the connection consists of a simple integer,
> the statement Brick2.In = Brick2.Out
> just assigns once a value to Brick2,
> so there's no real communication anymore.
> I solved that by adding modify-flags and receiver lists.
> 
> The problem is how can I determine
> if a connection is a pointer or not ?
> Which I'm not sure might be the same as mutable ?
> ( The type of connection need not be a standard Python type,
> but might be any type created by the user. )

AFAIK there is no distinction possible by some attribute or function. I 
guess your safest bet is to provide a discreet list of immutables, and 
check objects for them being subclass of these. If yes, create the 
needed communication channels.

OTOH, the better option might even be to intercept the setting of 
objects on your bricks. If somebody sets a value on some brick's "slot", 
this is *always* something that needs to be communicated - it could be a 
new list, couldn't it? So knowing if that object is mutable is 
irrelevant I'd say.

Diez


From claird at lairds.us  Tue Feb 17 09:30:27 2009
From: claird at lairds.us (Cameron Laird)
Date: Tue, 17 Feb 2009 14:30:27 +0000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <39uq66-b7j.ln1@lairds.us>

In article <pan.2009.02.10.22.26.39 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
			.
			.
			.
>> And now for my version (which admitedly isn't really mine, and returns
>> slightly incorrect fib(n) for large values of n, due to the limited
>> floating point precision).
>
>The floating point version is nice, but it starts giving incorrect 
>answers relatively early, from n=71. But if you don't need accurate 
>results (a relative error of 3e-15 for n=71), it is very fast.
			.
			.
			.
While my personal opinion is that it's silly to 
characterize an error of 3e-15 as not "accurate",
I think more constructive is to focus on the fact
that the closed-form solution can be touched up
to give a precise integral solution, while re-
taining its (approximately) O(log n) run-time
cost.


From floris.bruynooghe at gmail.com  Tue Feb 17 09:30:45 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 06:30:45 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com> 
	<mailman.86.1234848688.11746.python-list@python.org>
Message-ID: <ae9cac11-aa27-4213-b1aa-a3cc2f9bbb6f@f33g2000vbf.googlegroups.com>

On Feb 17, 5:31?am, Chris Rebert <c... at rebertia.com> wrote:
> My understanding is that for efficiency purposes Python hangs on to
> the extra memory even after the object has been GC-ed and doesn't give
> it back to the OS right away.

Even if Python would free() the space no more used by it's own memory
allocator (PyMem_Malloc(), PyMem_Free() & Co) the OS usually doesn't
return this space to the global free memory pool but instead leaves it
assigned to the process, again for performance reasons.  Only when the
OS is running out of memory it will go and get the free()ed memory of
processes back.  There might be a way to force your OS to do so
earlier manually if you really want but I'm not sure how you'd do
that.

Regards
Floris


From david.russell at fdmgroup.com  Tue Feb 17 09:35:05 2009
From: david.russell at fdmgroup.com (David Russell)
Date: Tue, 17 Feb 2009 14:35:05 -0000
Subject: 2 very interesting python projects - Financial industry
Message-ID: <E5420629A0DEB64291F2973D3D3D5FFC9DC847@fdm-mail02.fdmgroup.local>

Dear Python experts,

 

First of all sorry for the unsolicited email,

 

I have attached two very interesting long term Python projects in the
Frankfurt area, Financial industry.

 

I am working exclusively with the client on both requirements,
interviews and contracts can be arranged very quickly.

 

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system of its kind in the world and will be used on a global scale.

 

Financial experience is not a must, they are looking more for technical
skills here.

 

If the projects look interesting to you please feel free to contact me
on the contact details below.

 

Thank you for your help,

 

Best Regards

 

David

 

Large Financial Institution - Frankfurt

 

Senior Python C/C++ Developer  (f/m)

 

Tasks/Responsibilities

Software developer for a complex electronic trading system.

The software developer will work in the implementation team of the
trading

system; tasks include:

        - Requirements Analysis

        - Development of a Scripting framework based on Python

        - Specification

        - Implementation

Target platform will be Linux.

 

Qualifications/Required Skills (Mandatory)

Rock Solid Python and C/C++ knowledge

Integration of Python with C/C++ libraries

Automated Testing

Good overview and knowledge of open source software

Experience of software development in large projects

Good communications skills

Ability to work in project teams

A good command of English is a must.

 

Additional Domain & Business Skills

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options.

 

Additional Information:

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Start ASAP for a minimum of 6 months

Rate - Negotiable

 

This is an urgent requirement please contact me or send me your cv as
soon as possible.

 

Contact: David Russell - Account manager

email: david.russell at fdmgroup.com

Tel: +49 (0) 69 756 0050

Web: www.fdmgroup.com

 

 

////////////////////////////////////////////////////////////////////////
///

 

Large Financial Institution - Frankfurt am Main

 

Performance / High Availability Test Automation Engineer (f/m)

 

Tasks/Responsibilities

Developer of automated test procedures for a high-performance electronic
trading system.

The engineer will work in the Performance and Technical Test team of the
project; tasks include:

        - Requirements Analysis

        - Development of distributed transaction feed procedures, mostly
in Python

        - Implementation of automated result analysis

        - Design and implementation of test procedures for
failover/recovery scenarios in a multi-tier environment

        - Supervision of regular runs of the automated performance test
suite.

Target platform will be Linux.

 

Qualifications/Required Skills

Python scripting

Deep (>3 years) knowledge of Linux, with a focus in the areas

  - Performance monitoring and tuning

  - Messaging architectures

Performance testing experience, for latency and throughput, incl. data
aggregation and reporting Good communications skills Experience of
software development in large projects Good overview and knowledge of
open source software Ability to work in an international project team.

 

A good command of English is a must.

 

Additional Domain & Business Skills

Knowledge of statistical data analysis methods would be an advantage.

Experience in mechanisms of interfacing C/C++ and Python would also be
advantageous.

Frankfurt am Main, Germany

Start ASAP to 31.12.09 with good extension prospects for 2010

Rate - Negotiable

 

This is an urgent requirement please contact me or send me your cv as
soon as possible.

 

Contact: David Russell - Account manager

email: david.russell at fdmgroup.com

Tel: +49 (0) 69 756 0050

Web: www.fdmgroup.com

 

 

David Russell

Account Manager

 

FDM Group

 


 

 

Beethoven Strasse 4,

60325 Frankfurt am Main

Germany

david.russell at fdmgroup.com <mailto:kasia at fdmgroup.com> 

 

Tel:  + 49 (0) 69 756 0050

Cell: + 49 (0) 173 3592288

Fax: + 49 (0) 69 756 00555

 

www.fdmgroup.com <http://www.fdmgroup.com/>   www.fdmacademy.com
<http://www.fdmacademy.com/>  

BRIGHTON, LONDON, MANCHESTER, LUXEMBOURG, FRANKFURT, ZURICH & NEW YORK

 


This message is from FDM Group Plc, and may contain information that is confidential or privileged.  If you are not the intended recipient, please delete the message and any attachments and notify the sender.  This email is not intended to create legally binding commitments on behalf of FDM Group Plc, nor do its contents reflect the corporate views or policies of FDM.  Any unauthorised disclosure, use or dissemination, either whole or partial, is prohibited. FDM Group Plc is a private limited company registered in England (Reg. No. 2542980).


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From marduk at letterboxes.org  Tue Feb 17 09:38:41 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 17 Feb 2009 09:38:41 -0500
Subject: listing files by modification time
In-Reply-To: <48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
	<48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>
Message-ID: <1234881521.5905.3.camel@centar.nbk>

On Tue, 2009-02-17 at 19:46 +0530, Deepak Rokade wrote:
> 
> Yes I can do that but for that I will have to go through entire list
> of files and also I will have to first get the whole list of files
> present in directory.
> 
> In case of my application this list can be huge and so want to list
> the files which suits my criteria.
> Similar to the unix find command I sent earlier or like below.
> 

In that case use a generator like os.walk.  That's pretty much the same
thing "find" does anyway.




From stef.mientki at gmail.com  Tue Feb 17 09:49:00 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 17 Feb 2009 15:49:00 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable
	)  ?
In-Reply-To: <6vvv7tFlvv6jU1@mid.uni-berlin.de>
References: <mailman.109.1234879101.11746.python-list@python.org>
	<6vvv7tFlvv6jU1@mid.uni-berlin.de>
Message-ID: <499ACE5C.6040400@gmail.com>

thanks Diez,

Diez B. Roggisch wrote:
> Stef Mientki schrieb:
>> hello,
>>
>> I'm making a virtual machine,
>> in which (small) pieces of software (called bricks) are connected,
>> by connecting an output of a brick to the input of another brick.
>>
>> A connection between 2 bricks may be of any type,
>> so it might be simple integer,
>> or a multi-nested dictionary / list or whatsoever .
>>
>> Connections are made with the following statement (in simplified form)
>>
>> Brick2.In = Brick2.Out
>>
>> Now if the connection is a complex object, e.g. a list,
>> Brick2.In and Brick2.Out points to the same object,
>> and can automatically exchange information.
>>
>> Now if the connection consists of a simple integer,
>> the statement Brick2.In = Brick2.Out
>> just assigns once a value to Brick2,
>> so there's no real communication anymore.
>> I solved that by adding modify-flags and receiver lists.
>>
>> The problem is how can I determine
>> if a connection is a pointer or not ?
>> Which I'm not sure might be the same as mutable ?
>> ( The type of connection need not be a standard Python type,
>> but might be any type created by the user. )
>
> AFAIK there is no distinction possible by some attribute or function. 
> I guess your safest bet is to provide a discreet list of immutables, 
> and check objects for them being subclass of these.
Yes that's a reasonable approach.
Still I find it strange that you can't detect if an object is immutable.
> If yes, create the needed communication channels.
>
> OTOH, the better option might even be to intercept the setting of 
> objects on your bricks. If somebody sets a value on some brick's 
> "slot", this is *always* something that needs to be communicated 
if there are receivers / listeners, Yes
> - it could be a new list, couldn't it?
I've thought about that, but it makes the creation of the Bricks (which 
should be possible by novices) more complex.
By not making it a list on default, the execution of a brick might be as 
simple as:
  Out = 3 * In
But of course I could wrap that up, so it'll become a list,
I'll think about that.

thanks,
Stef
> So knowing if that object is mutable is irrelevant I'd say.
>
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From linuxguy123 at gmail.com  Tue Feb 17 09:54:40 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Tue, 17 Feb 2009 07:54:40 -0700
Subject: How do I declare global vars or class vars in Python ?
Message-ID: <1234882480.4183.5.camel@localhost.localdomain>

How do I do this in Python ?

#############################
declare A,B

function getA
    return A

function getB
    return B

function setA(value)
     A = value

function setB(value)
     B = value

main()
    getA
    getB
    dosomething
    setA(aValue)
    setB(aValue)
############################

The part I don't know to do is declare the variables, either as globals
or as vars in a class.  How is this done in Python without setting them
to a value ?

Thanks	
    




From roy at panix.com  Tue Feb 17 09:55:15 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 17 Feb 2009 09:55:15 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
	<01aaa1da$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <roy-9C6103.09551517022009@news.panix.com>

In article <01aaa1da$0$20629$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at pearwood.info> wrote:

> Okay, but that surely falls under chapter 18 of the "Advanced Python
> Programming for the Mars Rover" book rather than chapter 5 of "Newbies
> Guide to Python".

Well, sure, but this thread started out with my taking, ahem, exception to 
the statement, "never use bare excepts at all".  I agree that doing so is 
not typical, and not the kind of habit that new programmers should form 
because it's not the kind of situation new programmers are likely to be 
involved in.  But, "never" was too strong a word.


From kyosohma at gmail.com  Tue Feb 17 10:02:53 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 17 Feb 2009 07:02:53 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
	<70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
Message-ID: <aec079e2-058c-41e1-a338-07553f369f9e@j8g2000yql.googlegroups.com>

On Feb 17, 8:15?am, ??? <newpt... at gmail.com> wrote:
> Thanks for your reply.
>
> With sqlalchemy, an mapped must living in a session, you have no way
> to disconnect it with its session.
>
> For example :
>
> #-------------------------------------
> user = session.query(User).first()
> session.expunge(user)
> print user.name ? #Error here
> #-------------------------------------
>
> I just want to get an read-only copy of user disconnected with session
> to avoid ?unexpected database operation.
> But after expunge, properties of user is not accessible anymore.


If you don't want any unexpected database operations, don't call flush
() or commit() or just call rollback() BEFORE you do any real
operations.

There is a good sqlalchemy mailing list where even the developers hang
out and answer questions. I'm sure they could point you in the right
direction too.

Mike






>
> BTW : why you choose elixir instead of sqlalchemy's own schema
> definition style?
> Doesn't including another library means more chances of bugs?
>
> On Feb 17, 9:24?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > ??? schrieb:
>
> > > Hi all,
>
> > > Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> > > These are very powerful technologies to handle database. ?But I think
> > > my project are not complicated to enough to benefit from a complete
> > > ORM system.
>
> > > What I really want, is some easy ways to load data from database, and
> > > change rows of data to list of named tuple, then I could send these
> > > data to my client application.
>
> > > I don't think I want these subtle behavior such as lazy load, auto
> > > update, ect. in ORM.
>
> > > So is there some libraries like that?
>
> > > Or is there some tools that could generate code from database scheme
> > > as I want?
>
> > Sqlalchemy. You don't need to use the ORM-layer, and you can use
> > reflection to create schema-objects like tables.
>
> > Then you can use that to create SQL-queries simple & powerful, whilst
> > being DB-agnostic and having a road to start using the ORM if you
> > discover it is useful for you.
>
> > To be honest: if you can control the schema, I'd still go for an orm. I
> > for example use elixir. It makes the easy things *really* easy, and the
> > complicated ones ar still possible.
>
> > Diez



From google at mrabarnett.plus.com  Tue Feb 17 10:07:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 17 Feb 2009 15:07:37 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <1234882480.4183.5.camel@localhost.localdomain>
References: <1234882480.4183.5.camel@localhost.localdomain>
Message-ID: <499AD2B9.5020001@mrabarnett.plus.com>

Linuxguy123 wrote:
> How do I do this in Python ?
> 
> #############################
> declare A,B
> 
> function getA
>     return A
> 
> function getB
>     return B
> 
> function setA(value)
>      A = value
> 
> function setB(value)
>      B = value
> 
> main()
>     getA
>     getB
>     dosomething
>     setA(aValue)
>     setB(aValue)
> ############################
> 
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class.  How is this done in Python without setting them
> to a value ?
> 
It isn't possible to have an uninitialised variable. If it doesn't have
a value then it doesn't exist.


From patrick.oloughlin at gmail.com  Tue Feb 17 10:10:51 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:10:51 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <1234882480.4183.5.camel@localhost.localdomain>
References: <1234882480.4183.5.camel@localhost.localdomain>
Message-ID: <cc34a9320902170710r3496758y458dfaf7615866e7@mail.gmail.com>

Use the global statement.
http://docs.python.org/reference/simple_stmts.html#the-global-statement

A working example based on your pseudocode would be:
####################################
def getA():
    global A
    return A

def getB():
    global B
    return B

def setA(value):
    global A
    A = value

def setB(value):
    global B
    B = value

def main():
    setA(5)
    setB(6)
    print getA()
    print getB()

if __name__ == '__main__':
    main()

#####################################

Although honestly, I think you'd be best not coding like that (with
gets and sets and all) in python.

Paddy

2009/2/17 Linuxguy123 <linuxguy123 at gmail.com>:
> How do I do this in Python ?
>
> #############################
> declare A,B
>
> function getA
>    return A
>
> function getB
>    return B
>
> function setA(value)
>     A = value
>
> function setB(value)
>     B = value
>
> main()
>    getA
>    getB
>    dosomething
>    setA(aValue)
>    setB(aValue)
> ############################
>
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class.  How is this done in Python without setting them
> to a value ?
>
> Thanks
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From floris.bruynooghe at gmail.com  Tue Feb 17 10:12:02 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 07:12:02 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org> 
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org> 
	<gnaak5$1nek$1@services.telesweet.net>
Message-ID: <ed09f4b9-4469-4e2f-a8a8-a923b8ca093d@r24g2000vbp.googlegroups.com>

On Feb 16, 12:05?am, Mel <mwil... at the-wire.com> wrote:
> Christian Heimes wrote:
> > Roy Smith wrote:
> >> They make sense when you need to recover from any error that may occur,
> >> possibly as the last resort after catching and dealing with more specific
> >> exceptions. In an unattended embedded system (think Mars Rover), the
> >> top-level code might well be:
>
> >> while 1:
> >> ? ?try:
> >> ? ? ? main()
> >> ? ?except:
> >> ? ? ? reset()
>
> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> > and SyntaxError?
>
> Exactly. ?A normal program should never do anything more comprehensive than
>
> try:
> ? ? some_function ()
> except StandardError:
> ? ? some_handling ()

Hmm, most places advocate or even outright recommend derriving your
own exceptions from Exception and not from StandardError.  So maybe
your catch-all should be Exception?  In that case you would be
catching warnings though, no idea what influence that has on the
warning system.

Regards
Floris

PS: Does anybody know why StopIterantion derrives from Exception while
GeneratorExit derrives from BaseException?  This could be as annoying/
confusing as Warning.


From patrick.oloughlin at gmail.com  Tue Feb 17 10:13:38 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:13:38 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499AD2B9.5020001@mrabarnett.plus.com>
References: <1234882480.4183.5.camel@localhost.localdomain>
	<499AD2B9.5020001@mrabarnett.plus.com>
Message-ID: <cc34a9320902170713n49130127s8021428bb223c73f@mail.gmail.com>

2009/2/17 MRAB <google at mrabarnett.plus.com>:
> It isn't possible to have an uninitialised variable. If it doesn't have
> a value then it doesn't exist.

True, but you can use the global statement to refer to the variable
within a function and read from the variable there, without it being
already initialised in the module.

Of course, if you try to call that function before the global has been
initialised, python will complain [and rightly so :)]

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From jjposner at snet.net  Tue Feb 17 10:14:06 2009
From: jjposner at snet.net (John Posner)
Date: Tue, 17 Feb 2009 10:14:06 -0500
Subject: Changing the Image on a button
In-Reply-To: <e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
	<e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
Message-ID: <DAF110A3BA874133B780F430BDF61BCC@AMDUP>

 >> > Try this change:
 >> >
 >> > ? from: btn.configure(image = None)
 >> > ? ? to: img1.blank()
 >> >
 >> 
 >> This does in fact clear the image out, however it isn't causing the
 >> text to display... Do i have have to create a new button and swap it
 >> out?

I knew you were gonna ask that! :-) I haven't worked in this area before,
but I
found this at http://effbot.org/tkinterbook/button.htm:

    In earlier versions of Tkinter, the image option overrides the text
option.
    If you specify both, only the image is displayed. In later versions, you
can
    use the compound option to change this behavior. To display text on top
of
    an image, set compound to CENTER:
 
     b = Button(master, text="Click me", image=pattern, compound=CENTER)

So here's a reworking, in which the text and image are both toggled by
pressing the button:

### button that toggles both text and image
from Tkinter import *

def pushed():
    """callback: button push"""
    
    global toggle
    
    if toggle:
        btn.config(text="", image=img_empty)
        toggle = not toggle
    else:
        btn.config(text=msg, image=img_good)
        toggle = not toggle

### main program
toggle = True
msg = "hello"

root = Tk()

### store two versions of an image in global variables:
# 1. original image
img_good = PhotoImage(file="bacon.gif")

# 2. blank image, created by copying and erasing
img_empty = img_good.copy()
img_empty.blank()

### create toggle button
btn = Button(root, compound=CENTER,
            text="hello", font="helvetica 14 bold",
            image=img_good,
            command=pushed)
btn.pack()

### go
root.mainloop()





E-mail message checked by Spyware Doctor (6.0.0.386)
Database version: 5.11780
http://www.pctools.com/en/spyware-doctor-antivirus/


From Ron.Barak at lsi.com  Tue Feb 17 10:18:03 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 17 Feb 2009 15:18:03 +0000
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <20090217070546.5442B4A12D2@riobu.com>
References: <20090217070546.5442B4A12D2@riobu.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>

Hi,

May I have your recommendations in choosing threads or processes for the following ?

I have a wxPython application that builds an internal database from a list of files and then displays various aspects of that data, 
in response to user's requests.

I want to add a module that finds events in a set of log files (LogManager).
These log files are potentially huge, and the initial processing is lengthy (several minutes).
Thus, when the user will choose LogManager, it would be unacceptable to block the other parts of the program, and so - the initial LogManager processing
would need to be done separately from the normal run of the program.
Once the initial processing is done, the main program would be notified and could display the results of LogManager processing.

I was thinking of either using threads, or using separate processes, for the main programs and LogManager.

What would you suggest I should consider in choosing between the two options ?
Are there other options besides threads and multi-processing ?

Thanks,
Ron.

From jcd at sdf.lonestar.org  Tue Feb 17 10:27:57 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 17 Feb 2009 10:27:57 -0500
Subject: Is there something easier than ORM?
In-Reply-To: <70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
	<70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
Message-ID: <1234884477.4608.1.camel@aalcdl07.lib.unc.edu>


On Tue, 2009-02-17 at 06:15 -0800, ??? wrote:
> Thanks for your reply.
> 
> With sqlalchemy, an mapped must living in a session, you have no way
> to disconnect it with its session.
> 
> For example :
> 
> #-------------------------------------
> user = session.query(User).first()
> session.expunge(user)
> print user.name   #Error here
> #-------------------------------------
> 
> I just want to get an read-only copy of user disconnected with session
> to avoid  unexpected database operation.
> But after expunge, properties of user is not accessible anymore.

For that, the Right Thing to Do(tm) is to log in to your session with
read-only permissions.





From floris.bruynooghe at gmail.com  Tue Feb 17 10:29:49 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 07:29:49 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com> 
	<mailman.24.1234768147.11746.python-list@python.org>
Message-ID: <1de39f55-b42c-4d3e-8a9b-7d8f55f327d1@q18g2000vbn.googlegroups.com>

On Feb 16, 7:09?am, Python Nutter <pythonnut... at gmail.com> wrote:
> silly me, forgot to mention
>
> build a set from digits + '.' and use that for testing.

`.' is locale dependent.  Some locales might use `,' instead and maybe
there's even more out there that I don't know of.  So developing this
yourself from scratch seems dangerous, let it bubble down to libc
which should handle it correctly.


Regards
Floris


From patrick.oloughlin at gmail.com  Tue Feb 17 10:35:18 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:35:18 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
	<af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>
Message-ID: <cc34a9320902170735r683bc80n54a58f09cd683d6b@mail.gmail.com>

2009/2/16 Python Nutter <pythonnutter at gmail.com>:
> silly me, forgot to mention
>
> build a set from digits + '.' and use that for testing.
>
> Cheers,
> PN
>
>
> 2009/2/16 Python Nutter <pythonnutter at gmail.com>:
>> Type casting seems to be the wrong way to go about this.
>>
>> teststring = '15719'
>> teststring.isdigit()
>> returns True
>>
>> That takes care of integers.
>>
>> from string import digits
>> digits
>> '0123456789'
>>
>> now you have all the digits and you can do set testing in your logic
>> to see if the teststring has anything in digits
>>
>> A dumb way to test is alphanumeric
>>
>> teststring2 = '105.22'
>> teststring2.isalnum()
>> returns True
>>
>> now you can go on from there and test to further to eliminate
>> 'abcd385laf8' which on alnum() also returns true.

Hmmm, this doesn't seem right to me.

Unless I'm missing something, won't your code think that "123.123.123"
is numeric? What about scientific or engineering notation with
exponents?

What's wrong with using python's own casting rules (given that you are
trying to emulate the way python behaves? Or, alternatively, using a
regular expression (as Nick Craig-Wood did).

Given these solutions, type-conversion and catching the ValueError
appears, to me, to be correct, the most concise, and the most readable
solution.

Of course, if you want to use your own set of rules for number
encoding, then building your own regular expression would seem to be
the right way to go.

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From bryanvick at gmail.com  Tue Feb 17 10:37:12 2009
From: bryanvick at gmail.com (Bryan)
Date: Tue, 17 Feb 2009 07:37:12 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com> 
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com> 
	<mailman.95.1234859707.11746.python-list@python.org>
Message-ID: <08e76f94-7d31-4200-a774-c5c41d72f91f@r15g2000prd.googlegroups.com>

On Feb 17, 12:34?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanv... at gmail.com> escribi?:
>
>
>
> > On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> >> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>
> >> > I have a Python v2.5.2 server running and I found some undesirable
> >> > behavior in the xmlrpclib module that is included with that version of
> >> > Python. ?The xmlrpclib version that is included with Python 2.6
> >> > changes the behavior for the better. ?I nervous about upgrading my
> >> > Python install to 2.6 on this server because I remember reading in the
> >> > docs of a library I use that it targets the 2.5 branch. ?What is the
> >> > best way to only upgrade the xmlrpclib in my 2.5 install?
> >> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
> >> and 2.6, only significant differences I see are checks for True/False
> >> as builtins left over from pre-2.4 and some datetime handling.
> > The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
> > custom objects. ?It checks the type of my object, and if it isn't in a
> > hard-coded list of types, then a "Cannot marshal object of <type>
> > type" exception message shows up. ?The version in my Windows 2.6
> > install has a fall back case where if the type is not in the hard-
> > coded list, it simply calls Object.__dict__ to get a graph of the
> > object's values that can be marshaled into xmlrpc.
>
> > I am using xmlrpc through Pylons. ?As a workaround, instead of
> > returning my custom objects in my xmlrpc server functions, I return
> > MyObject.__dict__
>
> > I also did not see anything in the revision log in the source file
> > about this change.
>
> It was rev.52790:http://svn.python.org/view?rev=52790&view=rev
> The tracker item has some background:http://bugs.python.org/issue1070046
>
> --
> Gabriel Genellina

Can you give me a quick run down of your process for researching this
information?  I don't spend much time looking at the svn or bug
tracker.  Should I be checking there before posting?

Bryan


From python at bdurham.com  Tue Feb 17 10:45:48 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 10:45:48 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-9C6103.09551517022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
	<01aaa1da$0$20629$c3e8da3@news.astraweb.com>
	<roy-9C6103.09551517022009@news.panix.com>
Message-ID: <1234885548.2747.1300870339@webmail.messagingengine.com>

Original poster here: Just for the record, my *original* post did
include an explicit trapping of the ValueError exception. :) 

My point is that the coaching offered by this forum does not always fall
on deaf ears.

Thanks for everyone's help on this and all the other posts in this
forum.

Regards,
Malcolm

In article <01aaa1da$0$20629$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at pearwood.info> wrote:

> Okay, but that surely falls under chapter 18 of the "Advanced Python
> Programming for the Mars Rover" book rather than chapter 5 of "Newbies
> Guide to Python".

Well, sure, but this thread started out with my taking, ahem, exception
to the statement, "never use bare excepts at all". I agree that doing so
is not typical, and not the kind of habit that new programmers should
form 
because it's not the kind of situation new programmers are likely to be 
involved in.  But, "never" was too strong a word.


From sturlamolden at yahoo.no  Tue Feb 17 10:50:33 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Tue, 17 Feb 2009 07:50:33 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>

On 16 Feb, 10:34, rushen... at gmail.com wrote:

> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs.

The GIL does not prevent multithreaded programs. If it did, why does
Python have a "threading" module?

The GIL prevents one use of threads: parallel processing in plain
Python. You can still do parallel processing using processes. Just
import "multiprocessing" instead of "threading". The two modules have
fairly similar APIs. You can still use threads to run tasks in the
background.

The GIL by the way, is an implementation detail. Nobody likes it very
much. But it is used for making it easier to extend Python with C
libraries (Python's raison d'etre). Not all C libraries are thread-
safe. The GIL is also used to synchronize access to reference counts.
In fact, Ruby is finally going to get a GIL as well. So it can't be
that bad.

As for parallel processing and multicore processors:

1. Even if a Python script can only exploit one core, we are always
running more than one process on the computer. For some reason this
obvious fact has to be repeated.

2. Parallel processing implies "need for speed". We have a 200x speed
penalty form Python alone. The "need for speed" are better served by
moving computational bottlenecks to C or Fortran. And in this case,
the GIL does not prevent us from doing parallel processing. The GIL
only affects the Python portion of the code.

3. Threads are not designed to be an abstraction for parallel
processing. For this they are awkward, tedious, and error prone.
Current threading APIs were designed for asynchronous tasks. Back in
the 1990s when multithreading became popular, SMPs were luxury only
few could afford, and multicore processors were unheard of.

4. The easy way to do parallel processing is not threads but OpenMP,
MPI, or HPF. Threads are used internally by OpenMP and HPF, but those
implementation details are taken care of by the compiler. Parallel
computers have been used by scientists and engineers for three decades
now, and threads have never been found a useful abstraction for manual
coding. Unfortunately, this knowledge has not been passed on from
physicists and engineers to the majority of computer programmers.
Today, there is a whole generation of misguided computer scientists
thinking that threads must be the way to use the new multicore
processors. Take a lesson from those actually experienced with
parallel computers and learn OpenMP!

5. If you still insist on parallel processing with Python threads --
ignoring what you can do with multiprocessing and native C/Fortran
extensions -- you can still do that as well. Just compile your script
with Cython or Pyrex and release the GIL manually. The drawback is
that you cannot touch any Python objects (only C objects) in your GIL-
free blocks. But after all, the GIL is used to synchronize reference
counting, so you would have to synchronize access to the Python
objects anyway.


import threading

def _threadproc():
     with nogil:
        # we do not hold the GIL here
        pass
     # now we have got the GIL back
     return

def foobar():
    t = threading.Thread(target=_threadproc)
    t.start()
    t.join()

That's it.





Sturla Molden



From sturlamolden at yahoo.no  Tue Feb 17 10:57:44 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Tue, 17 Feb 2009 07:57:44 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
	<mailman.50.1234793130.11746.python-list@python.org>
	<6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
Message-ID: <0d62cc8c-6a53-46ef-b989-32b13422ab0a@x38g2000yqj.googlegroups.com>

On 16 Feb, 15:18, rushen... at gmail.com wrote:

> As you mentioned, using multi cores makes programs more fast and more
> popular. But what about stackless python? Does it interpret same set
> of python libraries with Cpython or Does it have a special sub set?

Stackless and CPython have a GIL, Jython and IronPython do not.

S.M.


From lists at cheimes.de  Tue Feb 17 10:59:33 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 16:59:33 +0100
Subject: memory recycling/garbage collecting problem
In-Reply-To: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
Message-ID: <gnemt5$cqi$1@ger.gmane.org>

Yuanxin Xi wrote:
> Could anyone please explain why this happens?  It seems some memory
> are not freed.  I'm running into problems with this as my program is
> very memory cosuming and need to frequently free some object to reuse
> the memory.  What is the best way to free the memory of b completely
> (i.e. back to the status as b was created)?  I'm using Python 2.5.2

Python uses malloc() and free() to allocate memory on the heap. Most
malloc() implementations don't give back memory to the system. Instead
the memory segment is still assigned to the process. In order to give
back memory to the system pool, a memory manager has to use mapped
memory (mmap()) instead of increasing the heap by changing the data
segment size with brk(). This isn't a Python flaw but a general issue
with malloc() based memory management. [1]

By the way Python has its own memory management system on top of the
system's malloc() system. The memory arena system is explained in great
detail in the file obmalloc.c [2].

Christian

[1] http://en.wikipedia.org/wiki/Malloc#Implementations
[2]
http://svn.python.org/view/python/branches/release25-maint/Objects/obmalloc.c?revision=65261&view=markup



From mabdelkader at gmail.com  Tue Feb 17 11:00:36 2009
From: mabdelkader at gmail.com (ma)
Date: Tue, 17 Feb 2009 11:00:36 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>
Message-ID: <148918f0902170800p1c23d172rce5e6b9902ba07e9@mail.gmail.com>

Very well written response! Thanks Sturla


On Tue, Feb 17, 2009 at 10:50 AM, sturlamolden <sturlamolden at yahoo.no>wrote:

> On 16 Feb, 10:34, rushen... at gmail.com wrote:
>
> > And the story begins here. As i search on the net,  I have found that
> > because of the natural characteristics of python such as GIL, we are
> > not able to write multi threaded programs. Oooops, in a kind of time
> > with lots of cpu cores and we are not able to write multi threaded
> > programs.
>
> The GIL does not prevent multithreaded programs. If it did, why does
> Python have a "threading" module?
>
> The GIL prevents one use of threads: parallel processing in plain
> Python. You can still do parallel processing using processes. Just
> import "multiprocessing" instead of "threading". The two modules have
> fairly similar APIs. You can still use threads to run tasks in the
> background.
>
> The GIL by the way, is an implementation detail. Nobody likes it very
> much. But it is used for making it easier to extend Python with C
> libraries (Python's raison d'etre). Not all C libraries are thread-
> safe. The GIL is also used to synchronize access to reference counts.
> In fact, Ruby is finally going to get a GIL as well. So it can't be
> that bad.
>
> As for parallel processing and multicore processors:
>
> 1. Even if a Python script can only exploit one core, we are always
> running more than one process on the computer. For some reason this
> obvious fact has to be repeated.
>
> 2. Parallel processing implies "need for speed". We have a 200x speed
> penalty form Python alone. The "need for speed" are better served by
> moving computational bottlenecks to C or Fortran. And in this case,
> the GIL does not prevent us from doing parallel processing. The GIL
> only affects the Python portion of the code.
>
> 3. Threads are not designed to be an abstraction for parallel
> processing. For this they are awkward, tedious, and error prone.
> Current threading APIs were designed for asynchronous tasks. Back in
> the 1990s when multithreading became popular, SMPs were luxury only
> few could afford, and multicore processors were unheard of.
>
> 4. The easy way to do parallel processing is not threads but OpenMP,
> MPI, or HPF. Threads are used internally by OpenMP and HPF, but those
> implementation details are taken care of by the compiler. Parallel
> computers have been used by scientists and engineers for three decades
> now, and threads have never been found a useful abstraction for manual
> coding. Unfortunately, this knowledge has not been passed on from
> physicists and engineers to the majority of computer programmers.
> Today, there is a whole generation of misguided computer scientists
> thinking that threads must be the way to use the new multicore
> processors. Take a lesson from those actually experienced with
> parallel computers and learn OpenMP!
>
> 5. If you still insist on parallel processing with Python threads --
> ignoring what you can do with multiprocessing and native C/Fortran
> extensions -- you can still do that as well. Just compile your script
> with Cython or Pyrex and release the GIL manually. The drawback is
> that you cannot touch any Python objects (only C objects) in your GIL-
> free blocks. But after all, the GIL is used to synchronize reference
> counting, so you would have to synchronize access to the Python
> objects anyway.
>
>
> import threading
>
> def _threadproc():
>     with nogil:
>        # we do not hold the GIL here
>        pass
>     # now we have got the GIL back
>     return
>
> def foobar():
>    t = threading.Thread(target=_threadproc)
>    t.start()
>    t.join()
>
> That's it.
>
>
>
>
>
> Sturla Molden
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From lists at cheimes.de  Tue Feb 17 11:04:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 17:04:12 +0100
Subject: memory recycling/garbage collecting problem
In-Reply-To: <1234879826.7672.11.camel@tim-laptop>
References: <mailman.85.1234848079.11746.python-list@python.org>	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
	<1234879826.7672.11.camel@tim-laptop>
Message-ID: <gnen5t$fjm$1@ger.gmane.org>

Tim Wintle wrote:
> Basically malloc() and free() are computationally expensive, so Python
> tries to call them as little as possible - but it's quite clever at
> knowing what to do - e.g. if a list has already grown large then python
> assumes it might grow large again and keeps hold of a percentage of the
> memory.

You are almost right. Python's mutable container types like have a
non-linear growth rate.

>From the file listobject.c

/*
This over-allocates proportional to the list size, making room
for additional growth.  The over-allocation is mild, but is
enough to give linear-time amortized behavior over a long
sequence of appends() in the presence of a poorly-performing
system realloc().
The growth pattern is:  0, 4, 8, 16, 25, 35, 46, 58, 72, 88, ...
*/

new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);



From kurdayon at yahoo.com  Tue Feb 17 11:19:10 2009
From: kurdayon at yahoo.com (Kurda Yon)
Date: Tue, 17 Feb 2009 08:19:10 -0800 (PST)
Subject: Python change a value of a variable by itself.
Message-ID: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>

Hi,

I have the following simple code:
r = {}
r[1] = [0.000000]
r_new = {}
print r[1][0]
r_new[1] = r[1]
r_new[1][0] = r[1][0] + 0.02
print r[1][0]

It outputs:
0.0
0.02

it is something strange to me since in the first and second case I
output the same variable (r[1][0]) and it the two cases it has
different values (in spite on the fact, that between the 2 outputs I
did not assign a new value to the variable).

Can anybody pleas explain me this strange behavior?

Thank you in advance.


From duncan.booth at invalid.invalid  Tue Feb 17 11:27:11 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 16:27:11 GMT
Subject: How do I declare global vars or class vars in Python ?
References: <1234882480.4183.5.camel@localhost.localdomain>
	<499AD2B9.5020001@mrabarnett.plus.com>
	<mailman.117.1234883623.11746.python-list@python.org>
Message-ID: <Xns9BB5A748F137Fduncanbooth@127.0.0.1>

"Paddy O'Loughlin" <patrick.oloughlin at gmail.com> wrote:

> True, but you can use the global statement to refer to the variable
> within a function and read from the variable there, without it being
> already initialised in the module.

You don't need the global statement unless you plan to *write* the variable 
from the function.

-- 
Duncan Booth http://kupuguy.blogspot.com


From apt.shansen at gmail.com  Tue Feb 17 11:28:14 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 17 Feb 2009 08:28:14 -0800
Subject: Python change a value of a variable by itself.
In-Reply-To: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
References: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
Message-ID: <7a9c25c20902170828y1573b381j171ccf8e676245b3@mail.gmail.com>

On Tue, Feb 17, 2009 at 8:19 AM, Kurda Yon <kurdayon at yahoo.com> wrote:
> r_new[1] = r[1]

This is the problem. "r" is a dictionary, a set of key/object pairs in
essence. You're making the object that "r[1]" is pointing to a list, a
mutable sequence of items.

The expression "r[1]" will then return that list object and assign it
to "r_new[1]" -- but now both these two dictionaries are pointing to
the *same* object. Its not a copy of the object, but the same object
itself which you're storing in two different dictionaries.

If you want to store a copy of that list in r_new[1], you can use the
copy module, or something like:

r_new[1] = r[1][:]

which uses list slices to return a copy of the specified list.

HTH,

--Stephen


From python.list at tim.thechases.com  Tue Feb 17 11:29:57 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 10:29:57 -0600
Subject: Python change a value of a variable by itself.
In-Reply-To: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
References: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
Message-ID: <499AE605.2020605@tim.thechases.com>


> I have the following simple code:
> r = {}
> r[1] = [0.000000]
> r_new = {}
> print r[1][0]
> r_new[1] = r[1]
> r_new[1][0] = r[1][0] + 0.02
> print r[1][0]
> 
> It outputs:
> 0.0
> 0.02
> 
> it is something strange to me since in the first and second case I
> output the same variable (r[1][0]) and it the two cases it has
> different values (in spite on the fact, that between the 2 outputs I
> did not assign a new value to the variable).
> 
> Can anybody pleas explain me this strange behavior?

You're referencing into a single mutable object (a list):

   a = [1,2,3]
   b = a
   b[1] = 4
   print a

both r[1] and r_new[1] refer to the same list object, so when the 
contents of that single list object is changed ("r_new[1][0] = 
...") accessing it by either name ("r[1][0]" or "r_new[1][0]") 
returns the same list.

To create a new list in r_new, use

   r_new[1] = r[1][:]  # copy the contents of the list

-tkc







From Caseyweb at gmail.com  Tue Feb 17 11:31:28 2009
From: Caseyweb at gmail.com (Casey)
Date: Tue, 17 Feb 2009 08:31:28 -0800 (PST)
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
Message-ID: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>

On Feb 17, 7:28?am, Christian Heimes <li... at cheimes.de> wrote:
> Peter Billam schrieb:
>
> > Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> > io.TextIOWrapper object; but I want to output bytes
> > ? (e.g. muscript -midi t > t.mid )
> > and they're coming out stringified :-( ?How can I either change the
> > encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> > mode, or dup(fd) it first, or whatever the right thing to do is ?
>
> The official API to write binary data to stdout is:
>
> >>> count = sys.stdout.buffer.write(b"abc\n")
>
> abc
>
> Christian

Is this really the 'official' way to do this?  This isn't meant to be
confrontational or trolling; I honestly don't know the answer and I
had similar questions when I first started with the 3.0 release
candidates and I have yet to find a good answer in the Python v3.0
documentation.  Why wouldn't you just use:

print(bytes.decode(b'abc\n'), end='')


From philip at semanchuk.com  Tue Feb 17 11:35:00 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 11:35:00 -0500
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>


On Feb 17, 2009, at 7:27 AM, ??? wrote:

> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

As others have suggested, there are lower-level libraries for database  
access, like the sqlite library included with Python >= 2.5.

The API wrapper I'm most familiar with (psycopg2) has some nice  
features like returning Postgres text as Python strings and Postgres  
ints as Python ints and Postgres arrays as Python lists. It can also  
return rows as dictionaries keyed by column names. You get some nice  
things for free.

I read someone's advice that one doesn't need an ORM for simple  
projects but they become more useful as projects grow in complexity.  
I'm not so sure of that. I felt like the opposite could well be true  
-- the limitations inherent in a general purpose tool like an ORM are  
less likely to be a problem in a small, simple project than a larger  
one.

In short, I gather that others on this list are a lot more fond of  
SqlAlchemy and ORMs in general than I am. Granted, my experience is  
very limited. I tried to integrate SqlAlchemy in one project,  
struggled for a long time to express how I wanted my tables joined,  
and finally found that performance was bad compared to our homegrown  
SQL. My boss and I were both very comfortable with SQL and were happy  
to go back to writing our own SQL statements and coding a data access  
layer.

I don't intend this as a criticism of SqlAlchemy. On the contrary I am  
impressed by what it does. But I often see people promoting ORM as the  
solution to all database access problems, and I certainly don't feel  
like it is.

Good luck,
Philip






From python-url at phaseit.net  Tue Feb 17 11:36:23 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Tue, 17 Feb 2009 16:36:23 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb 17)
Message-ID: <gnep27$rmb$1@lairds.us>

QOTW:  "The hardest part of design ...is keeping features out." - Donald
Norman, design guru and former Apple exec
    https://www.technologyreview.com/business/18621/

    
    Two short recipes: 
      Determine whether a string is a number or not:
        http://groups.google.com/group/comp.lang.python/t/5a63299d426f99ef
      See if a word contains some given characters:    
        http://groups.google.com/group/comp.lang.python/t/fb8c04c741e69f8f
     
    How to "peek" inside a decorated function to access the original one:
        http://groups.google.com/group/comp.lang.python/t/0fb2ee45dbc101b1
     
    Optimizing recursive calls:
        http://groups.google.com/group/comp.lang.python/t/2d3664075ff1363b
    
    Python 3.0.1, the first bug fix release of Python 3.0, was released last
    Saturday:
        http://www.python.org/download/releases/3.0.1/
    
    An attempt to define a generic "compress/decompress" interface (supporting
    zlib, bz2, maybe others):
        http://groups.google.com/group/comp.lang.python/t/ac2a57d661a3566c
    
    Long running processes and WSGI:
        http://groups.google.com/group/comp.lang.python/t/3d8a27fd5bb42842
    
    Unicode and the Windows console:
        http://groups.google.com/group/comp.lang.python/t/94360d3a3abf3747
    
    bool(some_generator) can't be used to check for "emptyness":
        http://groups.google.com/group/comp.lang.python/t/28cb5ad6cf9378bf
    
    An iterator class is the answer when a generator is not enough: 
        http://groups.google.com/group/comp.lang.python/t/2bbd5daed05bb025
    
    Using multiple processes as an alternative to multiple threads:
        http://groups.google.com/group/comp.lang.python/t/d068528be84ff8b5
     
    Can a function like Fibonacci's benefit from multicore architectures?
        http://groups.google.com/group/comp.lang.python/t/f66417d64090ee67
    
    Horrible algorithms have horrible performance -- don't count on
    automatic "optimizations":
        http://groups.google.com/group/comp.lang.python/t/3360de7fda1b7818
     
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From michele.simionato at gmail.com  Tue Feb 17 11:46:02 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 08:46:02 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<mailman.128.1234888507.11746.python-list@python.org>
Message-ID: <c6cd9473-03ea-4995-bfc4-20773130e1fe@x38g2000yqj.googlegroups.com>

On Feb 17, 5:35?pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
>
> I don't intend this as a criticism of SqlAlchemy. On the contrary I am ?
> impressed by what it does. But I often see people promoting ORM as the ?
> solution to all database access problems, and I certainly don't feel ?
> like it is.

I am also not a big fan of ORM, especially in situations where you
have
performance issues and you are using database specific features. In
such situations
you don't care about portability, but you care about having your SQL
explicit,
so that you can run it directly under the profiler.


From mail at timgolden.me.uk  Tue Feb 17 11:50:52 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 17 Feb 2009 16:50:52 +0000
Subject: Is there something easier than ORM?
In-Reply-To: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
Message-ID: <499AEAEC.30902@timgolden.me.uk>

Philip Semanchuk wrote:
[... snip comments on SqlAlchemy which could likewise apply
to other similar offerings ...]


> I don't intend this as a criticism of SqlAlchemy. On the contrary I am 
> impressed by what it does. But I often see people promoting ORM as the 
> solution to all database access problems, and I certainly don't feel 
> like it is.


I'm with you: I'm very glad that so many people find SA (and Storm
and Mother & SQLObject etc. useful). Personally, I earn my living
designing, maintaining and coding for relational databases and I'm
simply more at home in native SQL. 

If you're on Windows, pyodbc offers you a general spread of databases 
and has quite a few conveniences such as named rows returned; it's
fairly robust and is actively maintained. I imagine that most people
who do this kind of thing long ago put together a simple wrapper
module (mine's imaginatively called "sql") which does just enough
to be useful but then gets out the way.

All that said, if you don't *want* to have to think about SQL
then something like SA + Elixir is about as useful a combination
as I've found.

TJG


From andrew at acooke.org  Tue Feb 17 11:52:56 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 13:52:56 -0300 (CLST)
Subject: Is there something easier than ORM?
In-Reply-To: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
Message-ID: <49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>

Philip Semanchuk wrote:
> In short, I gather that others on this list are a lot more fond of
> SqlAlchemy and ORMs in general than I am. Granted, my experience is
> very limited. I tried to integrate SqlAlchemy in one project,
> struggled for a long time to express how I wanted my tables joined,
> and finally found that performance was bad compared to our homegrown
> SQL. My boss and I were both very comfortable with SQL and were happy
> to go back to writing our own SQL statements and coding a data access
> layer.
>
> I don't intend this as a criticism of SqlAlchemy. On the contrary I am
> impressed by what it does. But I often see people promoting ORM as the
> solution to all database access problems, and I certainly don't feel
> like it is.

the reason i, at least, like sqlalchemy so much is for exactly the reasons
you outlined.  unlike other orm solutions it doesn't force you to use orm.
 you can also use sql directly - either as simple strings or by
constructing it via python methods (which can be a very powerful way of
programatically constructing sql commands that would be a nightmare to
write by hand).  that gives you the flexibility to deal with each problem
in the way that feels most natural, without having to switch between tools
(in fact, i have mixed orm and "direct" sql in a single project with no
problems using sqlalchemy - reading from one database using sql and
writing to another using objects).

andrew




From gert.cuykens at gmail.com  Tue Feb 17 11:55:13 2009
From: gert.cuykens at gmail.com (gert)
Date: Tue, 17 Feb 2009 08:55:13 -0800 (PST)
Subject: Threading and tkinter
Message-ID: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>

After reading the docs and seeing a few examples i think this should
work ?
Am I forgetting something here or am I doing something stupid ?
Anyway I see my yellow screen, that has to count for something :)

from tkinter import *
from threading import Thread

class Weegbrug(Thread):
    def __init__(self,v):
        self.v=v
        Thread.__init__(self)
    def run(self):
        while True:
            with open('com1','r') as f:
                 for line in f:
                     self.v.set(line[2:-1])

root = Tk()
v = StringVar()
v.set("00000")
w = Weegbrug(v)
w.start()
tx = Label(root, textvariable=v, width=800, height=600, bg="yellow",
font=("Helvetica", 300))
tx.pack(expand=YES, fill=BOTH)
root.title("Weegbrug")
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.mainloop()


From lists at cheimes.de  Tue Feb 17 11:55:46 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 17:55:46 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<mailman.37.1234782471.11746.python-list@python.org>	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>	<mailman.50.1234793130.11746.python-list@python.org>
	<6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
Message-ID: <gneq6i$rns$1@ger.gmane.org>

rushenaly at gmail.com wrote:
> As you mentioned, using multi cores makes programs more fast and more
> popular. But what about stackless python? Does it interpret same set
> of python libraries with Cpython or Does it have a special sub set?

Your assumption is wrong. Multiple cores are able to speed up some kind
of programs. But they don't necessarily increase the speed of every
program.

Lot's of programs are IO bound (hard disk IO, network IO, memory IO).
Multiple CPU cores don't increase the speed of your hard disk! Lots of
algorithms are not designed for parallel computing. New algorithms must
be invented from the ground up.
In fact multiple CPUs can decrease the speed of a program because every
additional CPU increases the cost for house keeping and cache
invalidation. Please don't believe in marketing lies, neither 64bit nor
multiple CPUs magically increase the speed of your computer. It's going
to take at least half a decade until the tools for multi core
development are working properly and reliable.

Christian



From bearophileHUGS at lycos.com  Tue Feb 17 12:00:49 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 09:00:49 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>
Message-ID: <41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>

Jayson Santos:
> After changing my code to use only functions instead classes
> my code is too much faster.
> Here cProfile statistcs:
> Using old code : 633608 function calls in 1.361 CPU seconds
> Using new code: 475487 function calls in 0.800 CPU seconds

If you show a pastebin of the new version (you can also paste it, for
reference for future people, when the pastebin will be deleted),
probably there are ways to improve it more.
And I also suggest you to try Psyco. (Someone recently has shown here
a compiled version for Windows of Psyco for Python 2.6).

Bye,
bearophile


From vedrandekovic at gmail.com  Tue Feb 17 12:02:36 2009
From: vedrandekovic at gmail.com (vedrandekovic at gmail.com)
Date: Tue, 17 Feb 2009 09:02:36 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com> 
	<gncrom$iil$1@ss408.t-com.hr>
Message-ID: <2a3da6d9-3725-4152-aff8-4bbb33e31cc0@v38g2000yqb.googlegroups.com>

On 17 velj, 00:09, "alejandro" <aleksanda... at brisiovonet.hr> wrote:
> Provjeri da si nisi stavio ansii kada si instalirao wx.python.
> Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u
> UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem

Pozdrav / Hello,

It works now, all post were very useful, but now i have same problem
with python MySQLdb. I want data that I got from
wxPython TextCtrl write to MySQL database, but I don't know how to
configure it.

Any examples?

Regards,
John


From oamram at gmail.com  Tue Feb 17 12:03:06 2009
From: oamram at gmail.com (oamram)
Date: Tue, 17 Feb 2009 09:03:06 -0800 (PST)
Subject: Reading from text
Message-ID: <22061427.post@talk.nabble.com>


Hi All,
new to python. i have a directory with about 50 text file and i need to
iterate through them and get
line 7 to 11 from each file and write those lines into another file(one file
that will contain all lines).

Cheers, Omer.
-- 
View this message in context: http://www.nabble.com/Reading-from-text-tp22061427p22061427.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From philip at semanchuk.com  Tue Feb 17 12:08:29 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 12:08:29 -0500
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
References: <20090217070546.5442B4A12D2@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
Message-ID: <8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>


On Feb 17, 2009, at 10:18 AM, Barak, Ron wrote:

> I have a wxPython application that builds an internal database from  
> a list of files and then displays various aspects of that data,
> in response to user's requests.
>
> I want to add a module that finds events in a set of log files  
> (LogManager).
> These log files are potentially huge, and the initial processing is  
> lengthy (several minutes).
> Thus, when the user will choose LogManager, it would be unacceptable  
> to block the other parts of the program, and so - the initial  
> LogManager processing
> would need to be done separately from the normal run of the program.
> Once the initial processing is done, the main program would be  
> notified and could display the results of LogManager processing.
>
> I was thinking of either using threads, or using separate processes,  
> for the main programs and LogManager.
>
> What would you suggest I should consider in choosing between the two  
> options ?
> Are there other options besides threads and multi-processing ?

Hi Ron,
The general rule is that it is a lot easier to share data between  
threads than between processes. The multiprocessing library makes the  
latter easier but is only part of the standard library in Python >=  
2.6. The design of your application matters a lot. For instance, will  
the processing code write its results to a database, ping the GUI code  
and then exit, allowing the GUI to read the database? That sounds like  
an excellent setup for processes.

In addition, there's the GIL to consider. Multi-process applications  
aren't affected by it while multi-threaded applications may be. In  
these days where multi-processor/multi-core machines are more common,  
this fact is ever more important. Torrents of words have been written  
about the GIL on this list and elsewhere and I have nothing useful to  
add to the torrents. I encourage you to read some of those  
conversations.

FWIW, when I was faced with a similar setup, I went with multiple  
processes rather than threads.

Last but not least, since you asked about alternatives to threads and  
multiprocessing, I'll point you to some low level libraries I wrote  
for doing interprocess communication:
http://semanchuk.com/philip/posix_ipc/
http://semanchuk.com/philip/sysv_ipc/

Good luck
Philip






From robert.kern at gmail.com  Tue Feb 17 12:10:25 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 11:10:25 -0600
Subject: Is there something easier than ORM?
In-Reply-To: <49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>
Message-ID: <gner21$ukv$1@ger.gmane.org>

On 2009-02-17 10:52, andrew cooke wrote:
> Philip Semanchuk wrote:
>> In short, I gather that others on this list are a lot more fond of
>> SqlAlchemy and ORMs in general than I am. Granted, my experience is
>> very limited. I tried to integrate SqlAlchemy in one project,
>> struggled for a long time to express how I wanted my tables joined,
>> and finally found that performance was bad compared to our homegrown
>> SQL. My boss and I were both very comfortable with SQL and were happy
>> to go back to writing our own SQL statements and coding a data access
>> layer.
>>
>> I don't intend this as a criticism of SqlAlchemy. On the contrary I am
>> impressed by what it does. But I often see people promoting ORM as the
>> solution to all database access problems, and I certainly don't feel
>> like it is.
>
> the reason i, at least, like sqlalchemy so much is for exactly the reasons
> you outlined.  unlike other orm solutions it doesn't force you to use orm.
>   you can also use sql directly - either as simple strings or by
> constructing it via python methods (which can be a very powerful way of
> programatically constructing sql commands that would be a nightmare to
> write by hand).  that gives you the flexibility to deal with each problem
> in the way that feels most natural, without having to switch between tools
> (in fact, i have mixed orm and "direct" sql in a single project with no
> problems using sqlalchemy - reading from one database using sql and
> writing to another using objects).

Me, too! I have often used SQLAlchemy as "a better DB-API" even if I don't touch 
its ORM. I really don't know what I would have done in my past projects without 
SQLAlchemy's table reflection and metadata introspection capabilities.

It does suffer some from TMTOWTDI, but there's usually a valid use case floating 
around somewhere for each WTDI.

Its public image definitely suffers from the impression that it's "an ORM" that 
can be compared on equal terms with packages that actually are just ORMs. I 
describe it as a very powerful toolkit for solving a wide variety of problems 
involving SQL databases. One of those tools happens to be an ORM.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From zorro at chez.Com  Tue Feb 17 12:12:07 2009
From: zorro at chez.Com (JB)
Date: Tue, 17 Feb 2009 18:12:07 +0100
Subject: Reading from text
In-Reply-To: <mailman.132.1234890195.11746.python-list@python.org>
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <499aefe5$0$3510$426a74cc@news.free.fr>

oamram a ?crit :
> Hi All,
> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one file
> that will contain all lines).

First create a function that read and parse one file

Then create a loop that call this function for each file in a directory

Modules to read :

http://www.python.org/doc/2.5.2/tut/node9.html#SECTION009210000000000000000
http://docs.python.org/library/os.html


Julien


From Krzysztof.Retel at googlemail.com  Tue Feb 17 12:16:08 2009
From: Krzysztof.Retel at googlemail.com (kretel)
Date: Tue, 17 Feb 2009 09:16:08 -0800 (PST)
Subject: A python versioning scheme for modules, patches, softwares etc.
Message-ID: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>

There exist a number of versioning schemes to keep track of software
version. Each developer certainly have it's own style and preferred
scheme. However, I am wonder if there is a specific versioning scheme
for python modules.

Regards,
Krzysztof


From peter at www.pjb.com.au  Tue Feb 17 12:23:26 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 17:23:26 GMT
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
Message-ID: <slrngplskf.2vf.peter@box8.pjb.com.au>

On 2009-02-17, Christian Heimes <lists at cheimes.de> wrote:
> Peter Billam schrieb:
>> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
>> io.TextIOWrapper object; but I want to output bytes
>>   (e.g. muscript -midi t > t.mid )
>> and they're coming out stringified :-(  How can I either change the
>> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
>> mode, or dup(fd) it first, or whatever the right thing to do is ?
>
> The official API to write binary data to stdout is:
>
>>>> count = sys.stdout.buffer.write(b"abc\n")
> abc

That's the one that works the best for me :-)
Thanks for all the suggestions!

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From robert.kern at gmail.com  Tue Feb 17 12:31:00 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 11:31:00 -0600
Subject: A python versioning scheme for modules, patches, softwares etc.
In-Reply-To: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
References: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
Message-ID: <gnes8l$4kh$1@ger.gmane.org>

On 2009-02-17 11:16, kretel wrote:
> There exist a number of versioning schemes to keep track of software
> version. Each developer certainly have it's own style and preferred
> scheme. However, I am wonder if there is a specific versioning scheme
> for python modules.

A number of Python tools that manipulate Python packages use the version number 
parsing code in distutils.version, so it would be a good idea to use version 
numbers it can parse. From the docstring of the StrictVersion class in that module:

     """Version numbering for anal retentives and software idealists.
     Implements the standard interface for version number classes as
     described above.  A version number consists of two or three
     dot-separated numeric components, with an optional "pre-release" tag
     on the end.  The pre-release tag consists of the letter 'a' or 'b'
     followed by a number.  If the numeric components of two version
     numbers are equal, then one with a pre-release tag will always
     be deemed earlier (lesser) than one without.

     The following are valid version numbers (shown in the order that
     would be obtained by sorting according to the supplied cmp function):

         0.4       0.4.0  (these two are equivalent)
         0.4.1
         0.5a1
         0.5b3
         0.5
         0.9.6
         1.0
         1.0.4a3
         1.0.4b1
         1.0.4

     The following are examples of invalid version numbers:

         1
         2.7.2.2
         1.3.a4
         1.3pl1
         1.3c4

     The rationale for this version numbering system will be explained
     in the distutils documentation.
     """

You probably want to do release candidates, too, and the "1.3c4" format is 
really quite useful for that. In reality, people usually use LooseVersion from 
that module to parse version numbers, and it will accept "1.3c4". But it also 
accepts a whole lot of version number formats that I would not recommend that 
you use.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lists at cheimes.de  Tue Feb 17 12:33:41 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 18:33:41 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
Message-ID: <gnesdl$4q0$1@ger.gmane.org>

Casey wrote:
> Is this really the 'official' way to do this?  This isn't meant to be
> confrontational or trolling; I honestly don't know the answer and I
> had similar questions when I first started with the 3.0 release
> candidates and I have yet to find a good answer in the Python v3.0
> documentation.  

Yes, it's really the official way. You can google up the discussion
between me and Guido on the python-dev list if you don't trust me. ;)
The docs concur with me, too.

http://docs.python.org/3.0/library/sys.html#sys.stdin

Note: The standard streams are in text mode by default. To write or read
binary data to these, use the underlying binary buffer. For example, to
write bytes to stdout, use sys.stdout.buffer.write(b'abc').

> Why wouldn't you just use:
>
> print(bytes.decode(b'abc\n'), end='')

Because it doesn't work with binary data. You can't convert random bytes
to unicode. Try that with a JPEG file or even the byte sequence that
contains some invalid UTF-8 chars.

>>> bytes((255, 255, 255))
b'\xff\xff\xff'
>>> bytes((255, 255, 255)).decode()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 0:
unexpected code byte

Christian



From paul.lemelle at gmail.com  Tue Feb 17 12:37:27 2009
From: paul.lemelle at gmail.com (pdl5000)
Date: Tue, 17 Feb 2009 09:37:27 -0800 (PST)
Subject: Posting multiple files via a web site.
Message-ID: <dcc500ca-7111-48bb-a865-7dd6998fd5dc@f3g2000vbf.googlegroups.com>

I would like to start write a Python script that upload multiple files
to a web server.  I research the methods, and I am somewhat confused
between using the http & urllib2 modules.  I assume (and could be
wrong) that the most basic method would be to use a cgi-Python script
on the web server then use a client script on the local host - is this
a bad assumption?

And from the cgi script, would it be possible to direct the files to a
certain mount point?  If so, what method to use?

Thanks,
Paul


From bearophileHUGS at lycos.com  Tue Feb 17 12:48:21 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 09:48:21 -0800 (PST)
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>

oamram:
> i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another
> file(one file that will contain all lines).

Files can be iterated line-by-line, so this idiom:

for line in file: ...

will give you the lines, with newline. Once you have debugged that,
you can use the standard module glob (http://docs.python.org/library/
glob.html#module-glob ) to iterate on files.

If you have more problems, show use the code you have written and we
may suggest improvements.

Bye,
bearophile


From santosdosreis at gmail.com  Tue Feb 17 12:52:53 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Tue, 17 Feb 2009 09:52:53 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com> 
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>
Message-ID: <5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>

On 17 fev, 14:00, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > After changing my code to use only functions instead classes
> > my code is too much faster.
> > Here cProfile statistcs:
> > Using old code : 633608 function calls in 1.361 CPU seconds
> > Using new code: 475487 function calls in 0.800 CPU seconds
>
> If you show a pastebin of the new version (you can also paste it, for
> reference for future people, when the pastebin will be deleted),
> probably there are ways to improve it more.
> And I also suggest you to try Psyco. (Someone recently has shown here
> a compiled version for Windows of Psyco for Python 2.6).
>
> Bye,
> bearophile

I'm using linux with python 2.5
Here is the result using psyco.full(): 93 function calls in 0.243 CPU
seconds
And here is the final code: http://pastebin.com/f3e20d669
Bye,
Jayson


From lists at cheimes.de  Tue Feb 17 12:58:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 18:58:35 +0100
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>
References: <20090217070546.5442B4A12D2@riobu.com>	<7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
	<8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>
Message-ID: <gnetsb$a6k$1@ger.gmane.org>

Philip Semanchuk wrote:
> The general rule is that it is a lot easier to share data between
> threads than between processes. The multiprocessing library makes the
> latter easier but is only part of the standard library in Python >= 2.6.
> The design of your application matters a lot. For instance, will the
> processing code write its results to a database, ping the GUI code and
> then exit, allowing the GUI to read the database? That sounds like an
> excellent setup for processes.

A backport for Python 2.4 and 2.5 is available on pypi. Python 2.5.4 is
recommended though.

Christian



From google at mrabarnett.plus.com  Tue Feb 17 13:00:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 17 Feb 2009 18:00:32 +0000
Subject: Reading from text
In-Reply-To: <bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>
References: <mailman.132.1234890195.11746.python-list@python.org>
	<bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>
Message-ID: <499AFB40.6030403@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> oamram:
>> i have a directory with about 50 text file and i need to
>> iterate through them and get
>> line 7 to 11 from each file and write those lines into another
>> file(one file that will contain all lines).
> 
> Files can be iterated line-by-line, so this idiom:
> 
> for line in file: ...
> 
> will give you the lines, with newline. Once you have debugged that,
> you can use the standard module glob (http://docs.python.org/library/
> glob.html#module-glob ) to iterate on files.
> 
[snip]
Or:

     for index, line in enumerate(my_file): ...

where index will give you the line number (starting from 0, so you'll
want lines 6 to 10). You can break out of the loop when you have all the
lines you want.

> If you have more problems, show use the code you have written and we
> may suggest improvements.
> 


From invalid at invalid  Tue Feb 17 13:12:34 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 17 Feb 2009 12:12:34 -0600
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>

On 2009-02-17, oamram <oamram at gmail.com> wrote:

> i have a directory with about 50 text file and i need to
> iterate through them and get line 7 to 11 from each file and
> write those lines into another file(one file that will contain
> all lines).

Assuming this is a real task and not a homework problem, then
I'd do it this way:

  $ cd [directory containing 50 test files]
  $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt

-- 
Grant Edwards                   grante             Yow! ... My pants just went
                                  at               on a wild rampage through a
                               visi.com            Long Island Bowling Alley!!


From Caseyweb at gmail.com  Tue Feb 17 13:15:09 2009
From: Caseyweb at gmail.com (Casey)
Date: Tue, 17 Feb 2009 10:15:09 -0800 (PST)
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org> 
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com> 
	<mailman.136.1234892038.11746.python-list@python.org>
Message-ID: <61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>

On Feb 17, 12:33?pm, Christian Heimes <li... at cheimes.de> wrote:
> Yes, it's really the official way. You can google up the discussion
> between me and Guido on the python-dev list if you don't trust me. ;)
> The docs concur with me, too.
>
> http://docs.python.org/3.0/library/sys.html#sys.stdin
>
> Note: The standard streams are in text mode by default. To write or read
> binary data to these, use the underlying binary buffer. For example, to
> write bytes to stdout, use sys.stdout.buffer.write(b'abc').

Thanks! Incidentally, the 'Note:' section you reference in the HTML
docs doesn't appear to be in the .CHM file that installs with the
windows version of 3.01.  That would have made my search a lot
easier :-%


From lists at cheimes.de  Tue Feb 17 13:28:47 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 19:28:47 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
	<mailman.136.1234892038.11746.python-list@python.org>
	<61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>
Message-ID: <gnevku$gtj$1@ger.gmane.org>

Casey schrieb:
> On Feb 17, 12:33 pm, Christian Heimes <li... at cheimes.de> wrote:
>> Yes, it's really the official way. You can google up the discussion
>> between me and Guido on the python-dev list if you don't trust me. ;)
>> The docs concur with me, too.
>>
>> http://docs.python.org/3.0/library/sys.html#sys.stdin
>>
>> Note: The standard streams are in text mode by default. To write or read
>> binary data to these, use the underlying binary buffer. For example, to
>> write bytes to stdout, use sys.stdout.buffer.write(b'abc').
> 
> Thanks! Incidentally, the 'Note:' section you reference in the HTML
> docs doesn't appear to be in the .CHM file that installs with the
> windows version of 3.01.  That would have made my search a lot
> easier :-%

Oh, that should not happen. Please report this bug!

Christian



From Scott.Daniels at Acm.Org  Tue Feb 17 13:31:07 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 17 Feb 2009 10:31:07 -0800
Subject: printing bytes to stdout in Py3
In-Reply-To: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
Message-ID: <QL6dnW_oaJt8nAbUnZ2dnUVZ_gydnZ2d@pdx.net>

Casey wrote:
> ... Is this the 'official' way to do this?...  Why wouldn't you just use:
> print(bytes.decode(b'abc\n'), end='')

Because that code is incapable of sending bytes that cannot be
interpreted as encoded in the "default" encoding.  If you are
sending a picture, for example, all possible byte sequences might
show up.  If the default encoding is "utf-8", for example, there
are byte sequences which are illegal.  I suspect you are confused
by thinking each byte must map to a character; such an encoding
could never suffice for Chinese, for example.

--Scott David Daniels
Scott.Daniels at Acm.Org


From bearophileHUGS at lycos.com  Tue Feb 17 13:35:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 10:35:40 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com> 
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com> 
	<5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>
Message-ID: <8344eb45-c8ed-4513-9eaf-4fb1a4eba87b@v42g2000yqj.googlegroups.com>

Jayson Santos:
> And here is the final code:http://pastebin.com/f3e20d669

Note that if you use Psyco this lookup trick isn't useful, but if the
Psyco isn't available it can improve performance a little:
append = BitmapList['lines'].append


I suggest to replace this code:

        red, green, blue = struct.unpack('BBB', s[i:i+3])
        append({
            'red': red,
            'green': green,
            'blue': blue,
        })

With something just like:

        rbg = struct.unpack('BBB', s[i:i+3])

Later you can access r g and b by their position, avoiding the
allocation and creation of a new dict for each pixel.
(array.array too is able to do that, but using unpack is probably fine
too. Using an array.array you can probably decode many rbg triples in
a single time, and slice it later, this looks faster).


In the following code:

if __name__ == '__main__':
    ...
        ...
        for line in BitmapList['lines']:
            for x, color in enumerate(line):
                ...

note that Psyco is able to compile code only if it's inside functions
or methods, so it may give a bit of improvement if you move such loops
into a function.
I don't know if Psyco is already able to compile enumerate(), if not,
then replacing the enumerate with a manual counter speeds up the code.

I think ShedSkin doesn't have the struct module yet, once someone has
written such standard module, you can probably produce a compiled (C+
+) module with your code that 10-50 times faster than the original
Python code, with no changes in the Python code itself :-)

Bye,
bearophile


From python.list at tim.thechases.com  Tue Feb 17 13:44:07 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 12:44:07 -0600
Subject: Reading from text
In-Reply-To: <5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
References: <mailman.132.1234890195.11746.python-list@python.org>
	<5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
Message-ID: <499B0577.10807@tim.thechases.com>

> Assuming this is a real task and not a homework problem, then
> I'd do it this way:
> 
>   $ cd [directory containing 50 test files]
>   $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt

I'd use sed:

   sed -ns 7,11p /source/path/*.txt >/path/to/results.txt

hard to get much more concise than that with any common tool :)

-tkc






From sam at 2000soft.com  Tue Feb 17 13:49:08 2009
From: sam at 2000soft.com (Sam Clark)
Date: Tue, 17 Feb 2009 10:49:08 -0800
Subject: This application has failed to start because the application
	configuration is incorrect
Message-ID: <822B0E83D23291469317E34324687437022249@production.2000soft.com>

I am receiving the message "This application has failed to start because the application configuration is incorrect" when I attempt to run a compiled Python program on another machine.  I have used py2exe on both a 2.6.1 and a 2.6.0 version of the .py and .pyw files.  Everything works great on the machine where Python 2.6 is loaded, but fails on machines where I copy the .exe to the machine.  I'm a beginner at python programming.  In fact this is my first packaged program.  Any thoughts at a beginners level would be helpful.
 
Thank you,
 
Sam Clark
sam at 2000soft.com
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From noama at answers.com  Tue Feb 17 13:53:40 2009
From: noama at answers.com (Noam Aigerman)
Date: Tue, 17 Feb 2009 20:53:40 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <1233761152.373.14.camel@localhost.localdomain>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>

Hi,
Sorry for resurrecting an old thread, but it just bothers me that this
is the best way that python has to deal with killing running
functions... it's quite an ugly hack, no?

Is it a feature that's needed bit missing from python, or is it left out
on purpose (same way like java has deprecated thread.stop and
thread.suspend because they were not safe)?

Thanks, Noam

 

-----Original Message-----
From: python-list-bounces+noama=answers.com at python.org
[mailto:python-list-bounces+noama=answers.com at python.org] On Behalf Of
Albert Hopkins
Sent: Wednesday, February 04, 2009 5:26 PM
To: python-list at python.org
Subject: Re: Kill a function while it's being executed

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some
other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after
a
> certain amount of time has passed (without asking the user who's
giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a



--
http://mail.python.org/mailman/listinfo/python-list



From martin at v.loewis.de  Tue Feb 17 13:54:11 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 17 Feb 2009 19:54:11 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <499b07d3$0$677$9b622d9e@news.freenet.de>

> So is there some libraries like that?

I always use a DB-API implementation for the database I use,
i.e. psycopg/psycopg2.

Named tuples are really easy to provide:

class NamedTuple:
  def __init__(self, names, values):
    for name, value in izip(names, values):
        setattr(self, name, value)

person_rows = "first last age".split()
def get_person(conn, id):
    conn.execute("select first, last, age from person where id=%d"
                 % (id,))
    return NamedTuple(person_rows, conn.fetchone())

Regards,
Martin


From Krzysztof.Retel at googlemail.com  Tue Feb 17 14:00:15 2009
From: Krzysztof.Retel at googlemail.com (kretel)
Date: Tue, 17 Feb 2009 11:00:15 -0800 (PST)
Subject: A python versioning scheme for modules, patches, softwares etc.
References: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
	<mailman.135.1234891877.11746.python-list@python.org>
Message-ID: <2ccc7988-53ca-4329-b4ab-a63e95defaba@j1g2000yqi.googlegroups.com>

On Feb 17, 5:31?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-17 11:16, kretel wrote:
>
> > There exist a number of versioning schemes to keep track of software
> > version. Each developer certainly have it's own style and preferred
> > scheme. However, I am wonder if there is a specific versioning scheme
> > for python modules.
>
> A number of Python tools that manipulate Python packages use the version number
> parsing code in distutils.version, so it would be a good idea to use version
> numbers it can parse. From the docstring of the StrictVersion class in that module:
>
> ? ? ?"""Version numbering for anal retentives and software idealists.
> ? ? ?Implements the standard interface for version number classes as
> ? ? ?described above. ?A version number consists of two or three
> ? ? ?dot-separated numeric components, with an optional "pre-release" tag
> ? ? ?on the end. ?The pre-release tag consists of the letter 'a' or 'b'
> ? ? ?followed by a number. ?If the numeric components of two version
> ? ? ?numbers are equal, then one with a pre-release tag will always
> ? ? ?be deemed earlier (lesser) than one without.
>
> ? ? ?The following are valid version numbers (shown in the order that
> ? ? ?would be obtained by sorting according to the supplied cmp function):
>
> ? ? ? ? ?0.4 ? ? ? 0.4.0 ?(these two are equivalent)
> ? ? ? ? ?0.4.1
> ? ? ? ? ?0.5a1
> ? ? ? ? ?0.5b3
> ? ? ? ? ?0.5
> ? ? ? ? ?0.9.6
> ? ? ? ? ?1.0
> ? ? ? ? ?1.0.4a3
> ? ? ? ? ?1.0.4b1
> ? ? ? ? ?1.0.4
>
> ? ? ?The following are examples of invalid version numbers:
>
> ? ? ? ? ?1
> ? ? ? ? ?2.7.2.2
> ? ? ? ? ?1.3.a4
> ? ? ? ? ?1.3pl1
> ? ? ? ? ?1.3c4
>
> ? ? ?The rationale for this version numbering system will be explained
> ? ? ?in the distutils documentation.
> ? ? ?"""
>
> You probably want to do release candidates, too, and the "1.3c4" format is
> really quite useful for that. In reality, people usually use LooseVersion from
> that module to parse version numbers, and it will accept "1.3c4". But it also
> accepts a whole lot of version number formats that I would not recommend that
> you use.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

Thanks for pointing this out.


Krzysztof


From Scott.Daniels at Acm.Org  Tue Feb 17 14:01:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 17 Feb 2009 11:01:00 -0800
Subject: print string as raw string
In-Reply-To: <01aaa153$0$20629$c3e8da3@news.astraweb.com>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
	<01aaa153$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>

Steven D'Aprano wrote:
> Diez B. Roggisch wrote:
> 
>> Mirko Dziadzka schrieb:
>>> I'm trying to find a way to output strings in the raw-string format, e.g.
>>> print_as_raw_string(r"\.") should output r"\." instead of "\\."  ...
> In any case, this is just a variation of what repr() does.
>>>> repr(r'\.')
> "'\\\\.'"
> 
> What the OP seems to want is something like:...  a barely tested version:
> 
> def raw_repr(s):
>     """Return the repr of string s as a raw-string."""
>     r = repr(s)
>     if '\\\\' in r:
>         r = "r" + r.replace('\\\\', '\\')
>     assert not r.endswith('\\')
>     return r
...
The big issue I see is that lots of values cannot be represented
as raw strings.  Your code checks for a final '\', but many "control"
characters and the quote marks are also at issue.

raw_repr('["\']a\x13\xfebc\\de') should contain several nasty cases.


--Scott David Daniels
Scott.Daniels at Acm.Org


From invalid at invalid  Tue Feb 17 14:03:00 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 17 Feb 2009 13:03:00 -0600
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
	<5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
	<mailman.140.1234896250.11746.python-list@python.org>
Message-ID: <muidnVM6MoB5lAbUnZ2dnUVZ_jadnZ2d@posted.visi>

On 2009-02-17, Tim Chase <python.list at tim.thechases.com> wrote:
>> Assuming this is a real task and not a homework problem, then
>> I'd do it this way:
>> 
>>   $ cd [directory containing 50 test files]
>>   $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt
>
> I'd use sed:
>
>    sed -ns 7,11p /source/path/*.txt >/path/to/results.txt

Well done.

-- 
Grant Edwards                   grante             Yow! does your DRESSING
                                  at               ROOM have enough ASPARAGUS?
                               visi.com            


From kyosohma at gmail.com  Tue Feb 17 14:10:01 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 17 Feb 2009 11:10:01 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com> 
	<gncrom$iil$1@ss408.t-com.hr>
	<2a3da6d9-3725-4152-aff8-4bbb33e31cc0@v38g2000yqb.googlegroups.com>
Message-ID: <025d02e6-2b71-42e3-9ba2-f09ef293ac5f@o36g2000yqh.googlegroups.com>

On Feb 17, 11:02?am, vedrandeko... at gmail.com wrote:
> On 17 velj, 00:09, "alejandro" <aleksanda... at brisiovonet.hr> wrote:
>
> > Provjeri da si nisi stavio ansii kada si instalirao wx.python.
> > Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u
> > UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem
>
> Pozdrav / Hello,
>
> It works now, all post were very useful, but now i have same problem
> with python MySQLdb. I want data that I got from
> wxPython TextCtrl write to MySQL database, but I don't know how to
> configure it.
>
> Any examples?
>
> Regards,
> John

You'll need to look at the python database connector's docs and/or
MySQL's docs to know how to do that. It would help to know what you
are using to connect to the database: pyodbc, adodb, sqlalchemy?

Most of those packages have their own mailing lists, but you're
welcome to post here too.

Mike


From robert.kern at gmail.com  Tue Feb 17 14:25:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 13:25:09 -0600
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>	<1233761152.373.14.camel@localhost.localdomain>
	<749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>
Message-ID: <gnf2ul$udg$1@ger.gmane.org>

On 2009-02-17 12:53, Noam Aigerman wrote:
> Hi,
> Sorry for resurrecting an old thread, but it just bothers me that this
> is the best way that python has to deal with killing running
> functions... it's quite an ugly hack, no?
>
> Is it a feature that's needed bit missing from python, or is it left out
> on purpose (same way like java has deprecated thread.stop and
> thread.suspend because they were not safe)?

Left out on purpose because it is not safe.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Olivier.Darge at gmail.com  Tue Feb 17 14:29:19 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Tue, 17 Feb 2009 11:29:19 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <1d0c328a-17ce-483d-8b79-e098770df0db@o11g2000yql.googlegroups.com>

Thanks to everybody.
I need to test your propositions now :)

Olivier


From john106henry at hotmail.com  Tue Feb 17 14:37:26 2009
From: john106henry at hotmail.com (John Henry)
Date: Tue, 17 Feb 2009 11:37:26 -0800 (PST)
Subject: Invoking CutePDF from within Python
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<gn3knj$34a$1@aioe.org>
Message-ID: <d0a56078-319f-4508-9a10-b8ec10d0a7b5@k36g2000pri.googlegroups.com>

On Feb 13, 3:15?am, cm <carlos.m... at atisa.es> wrote:
> Hi John,> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".
>
> I can't answer you question but let me make a suggestion: Try
> PdfCreator. It lets you control all the process using an activex
> control. It has events to tell you when the jobs has finish, or report
> you of eventual errors.
>
> Download it from sf.net, and look into the samples.
>
> Best regards,
>
> Carlos.

Thank you for your (and others') response.  TJG's VB script
translation was correct but the script failed to invoke CutePDF.  So,
I downloaded PDFCreator as suggested.  I used the create test page
example and it worked right away.

Thanks for the help.


From python at bdurham.com  Tue Feb 17 15:00:19 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 15:00:19 -0500
Subject: List of locale values for locale.setlocale() under Windows
Message-ID: <1234900820.29552.1300909493@webmail.messagingengine.com>

I'm experimenting with the locale module and have been unable to
get the documentation examples to run on Windows XP. (The
examples run fine on Linux).
In particular, none of the locale.setlocale( category, locale )'s
sample locale parameter values are considered valid. Example:
>>> locale.setlocale( locale.LC_ALL, 'fr_FR' )
Traceback (most recent call last):
  File "<pyshell#160>", line 1, in <module>
    locale.setlocale( locale.LC_ALL, 'fr_FR' )
  File "c:\python26\lib\locale.py", line 494, in setlocale
    return _setlocale(category, locale)
Error: unsupported locale setting
The documentation states that these values "may vary across
platforms".
Here's what I get for my current locale:
>>> locale.getlocale()
('English_United States', '1252')
Any suggestions on where I can find the official list of locale
codes for Windows XP (or better yet, all versions of Windows XP
or later)?
Thank you,
Malcolm
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From jervisau at gmail.com  Tue Feb 17 15:08:04 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 18 Feb 2009 07:08:04 +1100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
Message-ID: <8e63a5ce0902171208p321e8e11wd152a3df6f3680fe@mail.gmail.com>

>
> This moves the for-loop out of slow Python into fast C and should be much,
> much faster for very large input.
>

_Should_ be faster.

Here is my test on an XP system Python 2.5.4. I had similar results on
python 2.7 trunk.

WORD = 'g' * 100
WORD2 = 'g' * 50 + 'U'

BIGWORD = 'g' * 10000 + 'U'

def any_test(word):
    return any(vowel in word for vowel in 'aeiouAEIOU')

def for_test(word):
    for vowel in 'aeiouAEIOU':
        if vowel in word:
            return True
    else:
        return False

**no vowels**
any: [0.36063678618957751, 0.36116506191682773, 0.36212355395824081]
for: [0.24044885376801672, 0.2417684017413404, 0.24084797257163482]

**vowel 'U' final char**
any: [0.38218764069443112, 0.38431925474244588, 0.38238668882188831]
for: [0.16398578356553717, 0.16433223810347286, 0.16593555537176385]

**BIG word vowel 'U' final char**
any: [8.0007259193539895, 7.9797344140269644, 7.8901742633514012]
for: [7.6664422372764101, 7.6784683633957584, 7.6683055766498001]

Cheers,


From josh.dukes at microvu.com  Tue Feb 17 15:19:15 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:19:15 -0800
Subject: Scanning a file character by character
In-Reply-To: <499203C6.9070501@tim.thechases.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
	<499203C6.9070501@tim.thechases.com>
Message-ID: <20090217121915.2bfd2859@microvu.com>

In [401]: import shlex

In [402]: shlex.split("""Joe went to 'the store' where he bought a "box of chocolates" and stuff.""")
Out[402]: 
['Joe',
 'went',
 'to',
 'the store',
 'where',
 'he',
 'bought',
 'a',
 'box of chocolates',
 'and',
 'stuff.']

how's that work for ya? 

http://docs.python.org/library/shlex.html

On Tue, 10 Feb 2009 16:46:30 -0600
Tim Chase <python.list at tim.thechases.com> wrote:

> >> Or for a slightly less simple minded splitting you could try
> >> re.split:
> >>
> >>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
> >>>>> over.")[1::2]
> >> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> > 
> > 
> > Perhaps I'm missing something, but the above regex does the exact
> > same thing as line.split() except it is significantly slower and
> > harder to read.
> > 
> > Neither deal with quoted text, apostrophes, hyphens, punctuation or
> > any other details of real-world text. That's what I mean by
> > "simple-minded".
> 
>    >>> s = "The quick brown fox jumps, and falls over."
>    >>> import re
>    >>> re.split(r"(\w+)", s)[1::2]
>    ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>    >>> s.split()
>    ['The', 'quick', 'brown', 'fox', 'jumps,', 'and', 'falls', 
> 'over.']
> 
> Note the difference in "jumps" vs. "jumps,"  (extra comma in the 
> string.split() version) and likewise the period after "over". 
> Thus not quite "the exact same thing as line.split()".
> 
> I think an easier-to-read variant would be
> 
>    >>> re.findall(r"\w+", s)
>    ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> 
> which just finds words.  One could also just limit it to letters with
> 
>    re.findall("[a-zA-Z]", s)
> 
> as "\w" is a little more encompassing (letters and underscores) 
> if that's a problem.
> 
> -tkc
> 
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


-- 

Josh Dukes
MicroVu IT Department


From python.list at tim.thechases.com  Tue Feb 17 15:26:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 14:26:17 -0600
Subject: Scanning a file character by character
In-Reply-To: <20090217121915.2bfd2859@microvu.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>	<499203C6.9070501@tim.thechases.com>
	<20090217121915.2bfd2859@microvu.com>
Message-ID: <499B1D69.3050409@tim.thechases.com>

Josh Dukes wrote:
> In [401]: import shlex
> 
> In [402]: shlex.split("""Joe went to 'the store' where he bought a "box of chocolates" and stuff.""")
> 
> how's that work for ya? 

It works great if that's the desired behavior.  However, the OP 
wrote about splitting the lines into separate words, not 
"treating quoted items as a single word".  (OP: "How would I do 
separate lines into words without scanning one character at a time?")

But for pulling out quoted strings as units, the shlex is a great 
module.

-tkc




From josh.dukes at microvu.com  Tue Feb 17 15:30:43 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:30:43 -0800
Subject: Putting asterisks around text
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
	<7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>
Message-ID: <20090217123043.6ad2fb20@microvu.com>

> while understand_problem is False:
>     study("textbook")
> 
> complete("homework")
> 
> if want_help is True:
>     study("http://www.catb.org/~esr/faqs/smart-questions.html")

just a note but "if" and "while" evaluate variables as True or False
without a verbose test. e.g.:

while not understand_problem:
    study("textbook")

complete("homework")

if want_help:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

Just fyi...

-- 

Josh Dukes
MicroVu IT Department


From philip at semanchuk.com  Tue Feb 17 15:30:52 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 15:30:52 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
Message-ID: <3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>


On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:

> Hi.
>
> I'm a newbie to python and am running:
>
> OS X 10.5.6
> Python 2.5.4

Hi John,
Are you using the system Python or have you installed another version?

Cheers
Philip




>
>
> and have run easy_install for gdal like this:
>
> /Library/Python/2.5/site-packages>sudo easy_install GDAL
> Password:
> Searching for GDAL
> Best match: GDAL 1.6.0
> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> GDAL 1.6.0 is already the active version in easy-install.pth
>
> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> i386.egg
> Processing dependencies for GDAL
> Finished processing dependencies for GDAL
>
> However, when I run python and try to import gdal, this is what  
> happens:
>
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import gdal
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named gdal
> >>>
>
> Clearly, it's not being found but I don't understand how to debug  
> this any further.  I have the *.egg in the site-packages directory  
> but don't understand if there is something else I have to do to make  
> it usable.  Any help would be much appreciated.
> Cheers.
> --------------
> John Helly, University of California, San Diego
> San Diego Supercomputer Center,  Mail Code 0527
> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
> and Physical Oceanography, Mail Code 0224
> 9500 Gilman Dr., La Jolla CA 92093
> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
> URL (http://www.sdsc.edu/~hellyj)
>
> --
> http://mail.python.org/mailman/listinfo/python-list



From hyugaricdeau at gmail.com  Tue Feb 17 15:31:50 2009
From: hyugaricdeau at gmail.com (Hyuga)
Date: Tue, 17 Feb 2009 12:31:50 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <36f3db07-aede-46ab-9c09-f5f44f882f7c@t3g2000yqa.googlegroups.com>

On Feb 16, 4:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...
>
> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?

Though I'm sure this has already been shot to death, I would just add
that maybe the better question would be: "Will Python make
multithreading less popular?"  My answer would be something along the
lines of, that would be nice, but it just depends on how many people
adopt Python for their applications, realize they can't use threads to
take advantage of multiple CPUs, ask this same bloody question for the
thousandth time, and are told to use the multiprocessing module.


From matzke at berkeley.edu  Tue Feb 17 15:36:07 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Tue, 17 Feb 2009 12:36:07 -0800
Subject: pythonic array subsetting
In-Reply-To: <499A5A73.4030905@islandtraining.com>
References: <499A560C.4000209@berkeley.edu>
	<499A5A73.4030905@islandtraining.com>
Message-ID: <499B1FB7.4000701@berkeley.edu>

Looks like "compress" is the right numpy function, but it took forever 
for me to find it...

x = array([[1,2,3], [4,5,6], [7,8,9]], dtype=float)
compress([1,2], x, axis=1)

result:
array([[ 1.,  2.],
        [ 4.,  5.],
        [ 7.,  8.]])




Gary Herron wrote:
> Nick Matzke wrote:
>> Hi,
>>
>> So I've got a square floating point array that is about 1000 x 1000.  
>> I need to  subset this array as efficiently as possible based on an 
>> ordered sublist of the list of rownames/colnames (they are the same, 
>> this is a symmetric array).
>>
>> e.g., if sublist is of length 500, and matches the rownames list at 
>> every other entry, I need to pull out a 500x500 array holding every 
>> other row & column in the parent array.
>>
>> I have to do this hundreds of times, so speed would be useful.
>>
>> Cheers!
>> Nick
> 
> Check out numpy at http://numpy.scipy.org
> 
> It can do what you want very efficiently.
> 
> 
> Gary Herron
> 
>>
>>
>>
> 
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From josh.dukes at microvu.com  Tue Feb 17 15:47:52 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:47:52 -0800
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <4993DE39.8030200@cosc.canterbury.ac.nz>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
Message-ID: <20090217124752.2d75f454@microvu.com>

What kind of cad are you focused on? Mechanical cad, architecutal cad,
or something else? If you're interested there have been some
experiments with blender
http://projects.blender.org/projects/blendercad/
http://blenderartists.org/forum/showthread.php?t=65559

Unfortunately I don't think anything ever came out of those. There's also a 2d cad called pythoncad, 
http://www.pythoncad.org/
There's also Salome, which seems to have a python interface. Basically though, there isn't anything good right now but I'd love to see this.

On Thu, 12 Feb 2009 21:30:49 +1300
greg <greg at cosc.canterbury.ac.nz> wrote:

> rantingrick wrote:
> 
> > It has long been my dream to create an open source 3D CAD program
> > and
> > 
> > I have a real good idea of the UI design
> 
> Have you seen Sketchup?
> 
>     http://sketchup.google.com/
> 
> It has an amazingly intuitive user interface, much better
> than any other 3D modeller I've seen. Anyone thinking of
> designing a 3D app would do well to study it closely, IMO.
> 
> Something with a Sketchup-like UI but designed for serious
> CAD work would be an incredibly good thing to have.
> 
> In any case, your project sounds interesting, and I'll
> be happy to discuss ideas if you want.
> 


-- 

Josh Dukes
MicroVu IT Department


From robert.kern at gmail.com  Tue Feb 17 16:17:00 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 15:17:00 -0600
Subject: pythonic array subsetting
In-Reply-To: <499B1FB7.4000701@berkeley.edu>
References: <499A560C.4000209@berkeley.edu>	<499A5A73.4030905@islandtraining.com>
	<499B1FB7.4000701@berkeley.edu>
Message-ID: <gnf9gf$o9v$1@ger.gmane.org>

On 2009-02-17 14:36, Nick Matzke wrote:
> Looks like "compress" is the right numpy function, but it took forever
> for me to find it...
>
> x = array([[1,2,3], [4,5,6], [7,8,9]], dtype=float)
> compress([1,2], x, axis=1)
>
> result:
> array([[ 1., 2.],
> [ 4., 5.],
> [ 7., 8.]])

No, that's actually not correct. compress() takes a boolean mask, not integer 
indices. It just happens to be the case that compress() implicitly appends 
Falses to the end if the lengths don't match. Also, numpy indices are 0-indexed 
just like most Python sequences.

If you need to specify integer indices, you need this:

In [4]: x[:,[0,1]]
Out[4]:
array([[ 1.,  2.],
        [ 4.,  5.],
        [ 7.,  8.]])

If you have more numpy questions, you should ask on the numpy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From thomasmallen at gmail.com  Tue Feb 17 16:46:41 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 13:46:41 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
Message-ID: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>

I must not be understanding something. This is a simple recursive
function that prints all HTML files in argv[1] as its scans the
directory's contents. Why do I get a RuntimeError for recursion depth
exceeded?

#!/usr/bin/env python

import os, sys

def main():
    absToRel(sys.argv[1], sys.argv[2])

def absToRel(dir, root):
    for filename in os.listdir(dir):
        if os.path.isdir(filename):
            absToRel(filename, root)
        else:
            if(filename.endswith("html") or filename.endswith("htm")):
                print filename

if __name__ == "__main__":
    main()


From ntwrkd at gmail.com  Tue Feb 17 16:55:28 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Tue, 17 Feb 2009 13:55:28 -0800
Subject: Jython Dev in Eclipse
Message-ID: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>

Does anyone use Pydev or JyDT for Eclipse.
Can you recommend one against the other?


From martin at v.loewis.de  Tue Feb 17 17:05:42 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 17 Feb 2009 23:05:42 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <499b34b6$0$27922$9b622d9e@news.freenet.de>

Thomas Allen wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):
>         if os.path.isdir(filename):

Perhaps you have a symlink somewhere that makes the tree appear to
have infinite depth?

Regards,
Martin


From lists at cheimes.de  Tue Feb 17 17:08:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 23:08:01 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <gnfcgh$1ua$1@ger.gmane.org>

Thomas Allen schrieb:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):
>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename


Why so complicated?

for root, dirs, files in os.walk(directory):
    for filename in files:
        if filename.endswith((".htm"), (".html")):
            print os.path.join(root, filename)

Christian



From thomasmallen at gmail.com  Tue Feb 17 17:08:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 14:08:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>

On Feb 17, 4:46?pm, Thomas Allen <thomasmal... at gmail.com> wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
>
> #!/usr/bin/env python
>
> import os, sys
>
> def main():
> ? ? absToRel(sys.argv[1], sys.argv[2])
>
> def absToRel(dir, root):
> ? ? for filename in os.listdir(dir):
> ? ? ? ? if os.path.isdir(filename):
> ? ? ? ? ? ? absToRel(filename, root)
> ? ? ? ? else:
> ? ? ? ? ? ? if(filename.endswith("html") or filename.endswith("htm")):
> ? ? ? ? ? ? ? ? print filename
>
> if __name__ == "__main__":
> ? ? main()

Please note that I'm not using os.walk(sys.argv[1]) because the
current depth of recursion is relevant to the transformation I'm
attempting. Basically, I'm transforming a live site to a local one and
the live site uses all absolute paths (not my decision...). I planned
on performing the replace like so for each line:

line.replace(root, "../" * depth)

So that a file in the top-level would simple remove all instances of
root, one level down would sub "../", etc.


From __peter__ at web.de  Tue Feb 17 17:31:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 17 Feb 2009 23:31:18 +0100
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <gnfdrg$62o$03$1@news.t-online.com>

Thomas Allen wrote:

> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):

          filename = os.path.join(dir, filename)

>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename
> 
> if __name__ == "__main__":
>     main()

Without the addition for a directory and a subdirectory of the same
name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result list
which triggers an absToRel() call on "dir" (the parent) ad infinitum.

Peter


From mcfletch at vrplumber.com  Tue Feb 17 17:37:05 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 17 Feb 2009 17:37:05 -0500
Subject: OpenGL in TK
In-Reply-To: <cc38d75f0901270222q1818eba4va7c674b8187f5f2@mail.gmail.com>
References: <cc38d75f0901270222q1818eba4va7c674b8187f5f2@mail.gmail.com>
Message-ID: <499B3C11.8090605@vrplumber.com>

Almar Klein wrote:
> Hi list!
>
> I am using pyOpenGL to do some 3D rendering. For now I am
> quite happy with the GLCanvas of wx, but I may want to publish
> some stuff later, and it would be nice if people would not need wx.
>
> I found that there used to be a TK widget called Togl, but it is not
> (anymore?) included in the TK package that comes with Python.
Togl was never included with Python, it used to be included with 
PyOpenGL, but it was always a royal PITA to build as it had to be built 
against the dev versions of Tcl and Tk that matched the Python ones.  
There's now a Togl project on SourceForge that provides a Win32 build of 
Togl.  There's a hacky script in PyOpenGL 3.x's "src/toglinstall" 
directory that tries to download the package from there and install it 
for you, but I'd expect it to be rather fragile and broken.

You wind up with an external binary download requirement one way or 
another.  Togl is pretty small compared to wxPython, of course, but 
you're looking a the same basic problem.
> Have others been able to use Togl, or any other OpenGL widget in
> TK?
I installed it using the above-mentioned hacky script a few months ago, 
checked that the wrapper (OpenGL/Tk) still worked with it, and then 
promptly ceased to particularly worry about it any more.  As has been 
the case for years, Togl needs an advocate who wants to work on the 
support in PyOpenGL, without that I just have no particular interest in 
maintaining it and the headache of maintenance has vastly outweighed my 
interest.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From thomasmallen at gmail.com  Tue Feb 17 17:39:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 14:39:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
Message-ID: <99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>

On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
> Thomas Allen wrote:
> > I must not be understanding something. This is a simple recursive
> > function that prints all HTML files in argv[1] as its scans the
> > directory's contents. Why do I get a RuntimeError for recursion depth
> > exceeded?
>
> > #!/usr/bin/env python
>
> > import os, sys
>
> > def main():
> > ? ? absToRel(sys.argv[1], sys.argv[2])
>
> > def absToRel(dir, root):
> > ? ? for filename in os.listdir(dir):
>
> ? ? ? ? ? filename = os.path.join(dir, filename)
>
> > ? ? ? ? if os.path.isdir(filename):
> > ? ? ? ? ? ? absToRel(filename, root)
> > ? ? ? ? else:
> > ? ? ? ? ? ? if(filename.endswith("html") or filename.endswith("htm")):
> > ? ? ? ? ? ? ? ? print filename
>
> > if __name__ == "__main__":
> > ? ? main()
>
> Without the addition for a directory and a subdirectory of the same
> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result list
> which triggers an absToRel() call on "dir" (the parent) ad infinitum.
>
> Peter

I have two problems in this case:

1. I don't know how to reliably map the current filename to an
absolute path beyond the top-most directory because my method of doing
so would be to os.path.join(os.getcwd(), filename)

2. For some reason, only one folder in the directory gets marked as a
directory itself when there are about nine others in the top-most
directory. I don't even know where to begin to solve this one.

I'm sure the first is an easy answer, but what do I need to do to
solve the second?


From semanticist at gmail.com  Tue Feb 17 17:43:54 2009
From: semanticist at gmail.com (Miles)
Date: Tue, 17 Feb 2009 17:43:54 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
Message-ID: <a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>

On Mon, Feb 16, 2009 at 8:35 PM, Helly John J. wrote:
> However, when I run python and try to import gdal, this is what happens:
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import gdal
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named gdal

What about "from osgeo import gdal"?

-Miles


From skippy.hammond at gmail.com  Tue Feb 17 17:44:13 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 18 Feb 2009 09:44:13 +1100
Subject: This application has failed to start because the application
	configuration is incorrect
In-Reply-To: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
Message-ID: <499B3DBD.90106@gmail.com>

On 18/02/2009 5:49 AM, Sam Clark wrote:
> I am receiving the message "This application has failed to start because
> the application configuration is incorrect" when I attempt to run a
> compiled Python program on another machine. I have used py2exe on both a
> 2.6.1 and a 2.6.0 version of the .py and .pyw files. Everything works
> great on the machine where Python 2.6 is loaded, but fails on machines
> where I copy the .exe to the machine. I'm a beginner at python
> programming. In fact this is my first packaged program. Any thoughts at
> a beginners level would be helpful.

This will be due to the C runtime library not being installed correctly 
on the target machine.  Python 2.6 has this problem more than earlier 
versions (due to the compiler used to build it) and the best way to 
address it isn't really clear yet unless you are willing to have them 
install these libraries via another Microsoft supplied installer. 
Probably the easiest workaround is to use Python 2.5 in the short term...

Mark


From __peter__ at web.de  Tue Feb 17 18:05:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 00:05:18 +0100
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
Message-ID: <gnffr7$aue$00$1@news.t-online.com>

Thomas Allen wrote:

> On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
>> Thomas Allen wrote:
>> > I must not be understanding something. This is a simple recursive
>> > function that prints all HTML files in argv[1] as its scans the
>> > directory's contents. Why do I get a RuntimeError for recursion depth
>> > exceeded?
>>
>> > #!/usr/bin/env python
>>
>> > import os, sys
>>
>> > def main():
>> > absToRel(sys.argv[1], sys.argv[2])
>>
>> > def absToRel(dir, root):
>> > for filename in os.listdir(dir):
>>
>> filename = os.path.join(dir, filename)
>>
>> > if os.path.isdir(filename):
>> > absToRel(filename, root)
>> > else:
>> > if(filename.endswith("html") or filename.endswith("htm")):
>> > print filename
>>
>> > if __name__ == "__main__":
>> > main()
>>
>> Without the addition for a directory and a subdirectory of the same
>> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result
>> list which triggers an absToRel() call on "dir" (the parent) ad
>> infinitum.
>>
>> Peter
> 
> I have two problems in this case:
> 
> 1. I don't know how to reliably map the current filename to an
> absolute path beyond the top-most directory because my method of doing
> so would be to os.path.join(os.getcwd(), filename)

Don't make things more complicated than necessary. If you can do
os.listdir(somedir) you can also do [os.path.join(somedir, fn) for fn in
os.listdir(somedir)].
 
> 2. For some reason, only one folder in the directory gets marked as a
> directory itself when there are about nine others in the top-most
> directory. I don't even know where to begin to solve this one.
> 
> I'm sure the first is an easy answer, but what do I need to do to
> solve the second?

If you solve the first properly the second might magically disappear. This
is what my crystal ball tells me because there is no code in sight...

Peter


From lionel.keene at gmail.com  Tue Feb 17 18:08:31 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 17 Feb 2009 15:08:31 -0800 (PST)
Subject: numpy.memmap advice?
Message-ID: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>

Hello all,

On a previous thread (http://groups.google.com/group/comp.lang.python/
browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
binary data. Briefly, my data consists of complex numbers, 32-bit
floats for real and imaginary parts. The data is stored as 4 bytes
Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
row-major format. I needed to read the data in as two separate numpy
arrays, one for real values and one for imaginary values.

There were several very helpful performance tips offered, and one in
particular I've started looking into. The author suggested a
"numpy.memmap" object may be beneficial. It was suggested I use it as
follows:


descriptor = dtype([("r", "<f4"), ("i", "<f4")])
data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
print "First 100 real values:", data.r[:100]


I have two questions:
1) What is "recarray"?
2) The documentation for numpy.memmap claims that it is meant to be
used in situations where it is beneficial to load only segments of a
file into memory, not the whole thing. This is definately something
I'd like to be able to do as my files are frequently >1Gb. I don't
really see in the diocumentation how portions are loaded, however.
They seem to create small arrays and then assign the entire array
(i.e. file) to the memmap object. Let's assume I have a binary data
file of complex numbers in the format described above, and let's
assume that the size of the complex data array (that is, the entire
file) is 100x100 (rows x columns). Could someone please post a few
lines showing how to load the top-left 50 x 50 quadrant, and the lower-
right 50 x 50 quadrant into memmap objects? Thank you very much in
advance!

-L


From mike.barry at gmail.com  Tue Feb 17 18:10:50 2009
From: mike.barry at gmail.com (mbarry)
Date: Tue, 17 Feb 2009 15:10:50 -0800 (PST)
Subject: _socket.so source?
Message-ID: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>

Hello,


The socket module in Python uses _socket.so for most of its behavior.
I want to modify the code that generates the _socket.so file.
I need the source file and instructions on how to compile and build
_socket.so for Windows.
Can anyone point me to where I can find the source and/or
documentation for compiling a python shared object on Windows?

Thanks
-Mike


From james at agentultra.com  Tue Feb 17 18:12:57 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 17 Feb 2009 15:12:57 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
Message-ID: <878wo4verq.fsf@agentultra.com>


I recently started a project called TracShell
(http://code.google.com/p/tracshell) where I make heavy use of the
xmlrpclib core module.

When the number of RPC calls was small, wrapping each call in try/except
was acceptable. However, this obviously will duplicate code all over the
place. There are only ever two exceptions that the module itself will
throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
but not show stoppers.

To combat the duplication, my clever idea was to use a function
decorator to wrap any function that used xmlrpclib calls:

def catch_errors(fn):
    """
    A decorator to catch typical xmlrpclib exceptions
    """
    def wrapped(*args, **kwargs):
        try:
            return fn(*args, **kwargs)
        except xmlrpclib.ProtocolError, e:
            print "There was a problem communicating with the server."
            print "URL: %s" % e.url
            print "Headers: %s" % e.headers
            print "Error code: %d" % e.errcode
            print "Error message: %s" % e.errmsg
            print "Please file a report with the TracShell developers."
            pass
        except xmlrpclib.Fault, e:
            print "A fault ocurred"
            print "Fault code: %d" % e.faultCode
            print "Fault string: %s" % e.faultString
            print "If you think this message is the result of an error,"
            print "please file a report with the TracShell developers."
            pass
    return wrapped

Maybe I could rename the decorator to something meaningful, but besides
that it works pretty well. Now any function I write in my class that
uses RPC calls can be wrapped by this decorator and have the exception
handling done in a uniform way for these particular exceptions.

I was just curious if other Pythonistas out there used the same idea or
have a better one. Thoughts?


From rolf.oltmans at gmail.com  Tue Feb 17 18:15:56 2009
From: rolf.oltmans at gmail.com (Oltmans)
Date: Tue, 17 Feb 2009 15:15:56 -0800 (PST)
Subject: Searching Google?
Message-ID: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>

Hey all,

I want to search Google.com using a specific keyword and I just want
to read back the response using Pyhon. After some thorough Googling I
realized that I probably need a Search API key to do that. Is that
correct? Now, I don't have a search key so is there a workaround?
Please enlighten me.

Thanks,
Oltmans


From robert.kern at gmail.com  Tue Feb 17 18:22:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 17:22:09 -0600
Subject: numpy.memmap advice?
In-Reply-To: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <gnfgr2$hsb$1@ger.gmane.org>

On 2009-02-17 17:08, Lionel wrote:
> Hello all,
>
> On a previous thread (http://groups.google.com/group/comp.lang.python/
> browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> binary data. Briefly, my data consists of complex numbers, 32-bit
> floats for real and imaginary parts. The data is stored as 4 bytes
> Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> row-major format. I needed to read the data in as two separate numpy
> arrays, one for real values and one for imaginary values.

I don't have time to answer your questions now, so you should ask on the numpy 
mailing list where others can jump in.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From semanticist at gmail.com  Tue Feb 17 18:24:35 2009
From: semanticist at gmail.com (Miles)
Date: Tue, 17 Feb 2009 18:24:35 -0500
Subject: print string as raw string
In-Reply-To: <afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
	<01aaa153$0$20629$c3e8da3@news.astraweb.com>
	<afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>
Message-ID: <a49e45f50902171524y5cbbd2f1x8ac2705529a6a3f4@mail.gmail.com>

On Tue, Feb 17, 2009 at 2:01 PM, Scott David Daniels wrote:
>>> Mirko Dziadzka schrieb:
>>>>
>>>> I'm trying to find a way to output strings in the raw-string format,
>>>> e.g.
>>>> print_as_raw_string(r"\.") should output r"\." instead of "\\."  ...
>
> ...
> The big issue I see is that lots of values cannot be represented
> as raw strings.  Your code checks for a final '\', but many "control"
> characters and the quote marks are also at issue.
>
> raw_repr('["\']a\x13\xfebc\\de') should contain several nasty cases.

It seems to me that a raw_repr should only be required to be able to
encode strings that are representable as raw strings in the first
place.  Here's mine:

def raw_repr(s):
    if s and s[-1] == '\\':
        raise ValueError('No raw string representation; '
                         'string ends in backslash')
    # If you want to test for control and non-ASCII characters to raise
    # an exception, that's up to you
    quote = None
    if '\n' not in s:
        if "'" not in s:
            quote = "'"
        elif '"' not in s:
            quote = '"'
    if not quote:
        if "'''" not in s:
            quote = "'''"
        elif '"""' not in s:
            quote = '"""'
    if not quote:
        raise ValueError('No raw string representation; '
                         'string contains unescapable quote characters')
    return 'r' + quote + s + quote

>>> print raw_repr(r"1\2'3\n")
r"1\2'3\n"
>>> print raw_repr(r'''"What's up," he said.''')
r'''"What's up," he said.'''
>>> # valid raw string, left as an exercise for the reader:
... print raw_repr(r'"""'"'''") # ;)
Traceback (most recent call last):
  File "<stdin>", line 2, in ?
  File "<stdin>", line 19, in raw_repr
ValueError: No raw string representation; string contains unescapable
quote characters

-Miles


From __peter__ at web.de  Tue Feb 17 18:26:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 00:26:07 +0100
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>
	<5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>
Message-ID: <gnfh28$tl5$01$1@news.t-online.com>

Jayson Santos wrote:

> On 17 fev, 14:00, bearophileH... at lycos.com wrote:
>> Jayson Santos:
>>
>> > After changing my code to use only functions instead classes
>> > my code is too much faster.
>> > Here cProfile statistcs:
>> > Using old code : 633608 function calls in 1.361 CPU seconds
>> > Using new code: 475487 function calls in 0.800 CPU seconds
>>
>> If you show a pastebin of the new version (you can also paste it, for
>> reference for future people, when the pastebin will be deleted),
>> probably there are ways to improve it more.
>> And I also suggest you to try Psyco. (Someone recently has shown here
>> a compiled version for Windows of Psyco for Python 2.6).
>>
>> Bye,
>> bearophile
> 
> I'm using linux with python 2.5
> Here is the result using psyco.full(): 93 function calls in 0.243 CPU
> seconds
> And here is the final code: http://pastebin.com/f3e20d669

I think you are heading in the wrong direction. Turning classes into
dictionaries in code that runs just once (like the Bitmap class) makes your
program harder to read, not faster. Adding globals makes it non-reentrant.
You should really concentrate your optimization efforts on the inner loops.
Here avoiding loops written in Python and using tuples instead of a custom
class may offer significant speedups:

def bitmap_line(s):
    a = array.array("B")
    a.fromstring(s)
    return zip(*(iter(a),)*3)
 
Note that I didn't test or time it because your script requires other
changes to run on AMD64.

Peter


From nick.bastin at gmail.com  Tue Feb 17 18:29:46 2009
From: nick.bastin at gmail.com (Nicholas Bastin)
Date: Tue, 17 Feb 2009 18:29:46 -0500
Subject: Making extension modules play nice with help()?
Message-ID: <66d0a6e10902171529g53b0ac34h650ee03ace07ff28@mail.gmail.com>

I've always provided doc strings through PyMethodDef in the past, without
paying much attention to what happens in help() - they print fine when you
just use the doc string.  However, in help, you end up with methods that
have an indeterminate signature.  We generally make doc strings that look
like:
"get_root_calls() -> [ptv.Call, ...]"
"Returns all root calls for transactions in the trace."

Which works fine if you just print get_root_calls().__doc__ or somesuch, but
works out quite lousy if you use help():

|  get_root_calls(...)
|      get_root_calls() -> [ptv.Call, ...]
|      Returns all root calls for transactions in the trace.

So we end up with the method signature twice - once from help(), which is
meaningless (assuming a non-empty argument list), and once from the doc
string, which is actually useful.  Is there any way to either a) teach the
proper method signature to help(), or b) override it.

Also, while PyMethodDef has a nice place to put a doc string,
PyMappingMethods and tp_iter have no such place, and so we end up with
things like:

 |  __getitem__(...)
 |      x.__getitem__(y) <==> x[y]
 |
 |  __iter__(...)
 |      x.__iter__() <==> iter(x)

Which is decidedly unhelpful.  Can I grab the Type after it has been readied
and replace some attributes somewhere to put new strings in these places?

Of course, I can always cover the C extension module in a thin veneer of
python, but that starts to become a significant performance problem (not to
mention a maintenance nightmare).

--
Nick
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From gagsl-py2 at yahoo.com.ar  Tue Feb 17 18:29:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 21:29:50 -0200
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>
	<mailman.95.1234859707.11746.python-list@python.org>
	<08e76f94-7d31-4200-a774-c5c41d72f91f@r15g2000prd.googlegroups.com>
Message-ID: <op.upirj0dlx6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 13:37:12 -0200, Bryan <bryanvick at gmail.com> escribi?:
> On Feb 17, 12:34?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanv... at gmail.com>  
>> escribi?:
>> > On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
>> >> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>>
>> >> > I have a Python v2.5.2 server running and I found some undesirable
>> >> > behavior in the xmlrpclib module that is included with that >> >  
>> version of
>> >> > Python. ?The xmlrpclib version that is included with Python 2.6
>> >> > changes the behavior for the better. ?
>>
>> > I also did not see anything in the revision log in the source file
>> > about this change.
>>
>> It was rev.52790:http://svn.python.org/view?rev=52790&view=rev
>> The tracker item has some background:http://bugs.python.org/issue1070046
>
> Can you give me a quick run down of your process for researching this
> information?  I don't spend much time looking at the svn or bug
> tracker.

First, I looked the section in xmlrpclib.py that you were refering to.  
Then, over a checked out copy of the sources, I ran:
svn blame xmlrpclib.py
and I got the revision those lines were last modified. Then from the log  
message of rev. 52790 I got the reference to the tracker item.

> Should I be checking there before posting?

It's a good idea to check first, but don't refrain from posting here.

-- 
Gabriel Genellina



From lists at cheimes.de  Tue Feb 17 18:47:16 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 00:47:16 +0100
Subject: _socket.so source?
In-Reply-To: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
References: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
Message-ID: <gnfia4$llp$1@ger.gmane.org>

mbarry schrieb:
> Hello,
> 
> 
> The socket module in Python uses _socket.so for most of its behavior.
> I want to modify the code that generates the _socket.so file.
> I need the source file and instructions on how to compile and build
> _socket.so for Windows.
> Can anyone point me to where I can find the source and/or
> documentation for compiling a python shared object on Windows?

You need the Python source tree (download the .tar.gz) and the correct
compiler in order to build a .dll / .pyd file on Windows. For Python 2.4
and 2.5 you need Visual Studio 2003 (VC7.1), for Python 2.6 and 3.0 you
have to install Visual Studio 2008 (VC9).

The code for the _socket extension is in the Modules/ subdirectory of
the source tree.

Christian



From thomasmallen at gmail.com  Tue Feb 17 18:52:56 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 15:52:56 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
Message-ID: <912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>

On Feb 17, 6:05?pm, Peter Otten <__pete... at web.de> wrote:
> Thomas Allen wrote:
> > On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
> >> Thomas Allen wrote:
> >> > I must not be understanding something. This is a simple recursive
> >> > function that prints all HTML files in argv[1] as its scans the
> >> > directory's contents. Why do I get a RuntimeError for recursion depth
> >> > exceeded?
>
> >> > #!/usr/bin/env python
>
> >> > import os, sys
>
> >> > def main():
> >> > absToRel(sys.argv[1], sys.argv[2])
>
> >> > def absToRel(dir, root):
> >> > for filename in os.listdir(dir):
>
> >> filename = os.path.join(dir, filename)
>
> >> > if os.path.isdir(filename):
> >> > absToRel(filename, root)
> >> > else:
> >> > if(filename.endswith("html") or filename.endswith("htm")):
> >> > print filename
>
> >> > if __name__ == "__main__":
> >> > main()
>
> >> Without the addition for a directory and a subdirectory of the same
> >> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result
> >> list which triggers an absToRel() call on "dir" (the parent) ad
> >> infinitum.
>
> >> Peter
>
> > I have two problems in this case:
>
> > 1. I don't know how to reliably map the current filename to an
> > absolute path beyond the top-most directory because my method of doing
> > so would be to os.path.join(os.getcwd(), filename)
>
> Don't make things more complicated than necessary. If you can do
> os.listdir(somedir) you can also do [os.path.join(somedir, fn) for fn in
> os.listdir(somedir)].
>
> > 2. For some reason, only one folder in the directory gets marked as a
> > directory itself when there are about nine others in the top-most
> > directory. I don't even know where to begin to solve this one.
>
> > I'm sure the first is an easy answer, but what do I need to do to
> > solve the second?
>
> If you solve the first properly the second might magically disappear. This
> is what my crystal ball tells me because there is no code in sight...
>
> Peter

I'm referring to the same code, but with a print:

for file in os.listdir(dir):
    if os.path.isdir(file):
        print "D", file

in place of the internal call to absToRel...and only one line prints
such a message. I mean, if I can't trust my OS or its Python
implementation (on a Windows box) to recognize a directory, I'm
wasting everyone's time here.

In any case, is this the best way to go about the problem in general?
Or is there already a way to recursively walk a directory, aware of
the current depth?

Thanks,
Thomas


From gagsl-py2 at yahoo.com.ar  Tue Feb 17 19:00:26 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 22:00:26 -0200
Subject: List of locale values for locale.setlocale() under Windows
References: <1234900820.29552.1300909493@webmail.messagingengine.com>
Message-ID: <op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 18:00:19 -0200, <python at bdurham.com> escribi?:

>>>> locale.getlocale()
> ('English_United States', '1252')
> Any suggestions on where I can find the official list of locale
> codes for Windows XP (or better yet, all versions of Windows XP
> or later)?

Are you looking for this?
http://msdn.microsoft.com/en-us/library/hzz3tw78(VS.80).aspx

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Tue Feb 17 19:04:08 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 18 Feb 2009 00:04:08 +0000
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <499B5078.2050908@mrabarnett.plus.com>

Thomas Allen wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):

os.listdir() returns a list of filenames, not filepaths. Create the
filepath with os.path.join(dir, filename).

>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename
> 
> if __name__ == "__main__":
>     main()
> 



From lists at cheimes.de  Tue Feb 17 19:05:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 01:05:57 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>	<gnfdrg$62o$03$1@news.t-online.com>	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
Message-ID: <gnfjd5$olr$1@ger.gmane.org>

Thomas Allen wrote:
> I'm referring to the same code, but with a print:
> 
> for file in os.listdir(dir):
>     if os.path.isdir(file):
>         print "D", file
> 
> in place of the internal call to absToRel...and only one line prints
> such a message. I mean, if I can't trust my OS or its Python
> implementation (on a Windows box) to recognize a directory, I'm
> wasting everyone's time here.

You are under a wrong assumption. You think os.listdir() returns a list
of absolute path elements. In fact it returns just a list of names. You
have to os.path.join(dir, file) to get an absolute path.

Anyway stop reinventing the wheel and use os.walk() as I already
explained. You can easily spot the depth with "directory.count(os.sep)".
 os.path.normpath() helps you to sanitize the path before counting the
number of os.sep.

Christian



From curt.hash at gmail.com  Tue Feb 17 19:43:31 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Tue, 17 Feb 2009 17:43:31 -0700
Subject: Searching Google?
In-Reply-To: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
Message-ID: <736698790902171643l58828125q56829ce07b1c7e71@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:15 PM, Oltmans <rolf.oltmans at gmail.com> wrote:
>
> Hey all,
>
> I want to search Google.com using a specific keyword and I just want
> to read back the response using Pyhon. After some thorough Googling I
> realized that I probably need a Search API key to do that. Is that
> correct? Now, I don't have a search key so is there a workaround?
> Please enlighten me.
>
> Thanks,
> Oltmans
> --
> http://mail.python.org/mailman/listinfo/python-list

You just need to change your User-Agent so that Google doesn't know a
Python script is making the request:

import urllib2
headers = {'User-Agent' : 'Mozilla/5.0 (X11; U; Linux i686; en-US;
rv:1.9.0.6) Gecko/2009020911 Ubuntu/8.04 (hardy) Firefox/3.0.6'}
query = 'foo'
req = urllib2.Request('http://www.google.com/search?&q=' + query,
headers=headers)
response = urllib2.urlopen(req)
results = response.read()


From benjamin.kaplan at case.edu  Tue Feb 17 19:59:09 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 17 Feb 2009 19:59:09 -0500
Subject: Jython Dev in Eclipse
In-Reply-To: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>
References: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>
Message-ID: <ec96e1390902171659y1c23f2e5md9144cd9c77a76d6@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:55 PM, ntwrkd <ntwrkd at gmail.com> wrote:

> Does anyone use Pydev or JyDT for Eclipse.
> Can you recommend one against the other?


JyDT hasn't had a release in the last few years. I don't think it will work
with the new versions of eclipse or Jython.

--
> http://mail.python.org/mailman/listinfo/python-list
>
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From dotancohen at gmail.com  Tue Feb 17 20:10:24 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Wed, 18 Feb 2009 03:10:24 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <880dece00902171710v145d37a3j56166103aabecc5d@mail.gmail.com>

> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps.

If you are really serious, then I am waiting for a Linux-compatible
Solidworks replacement. That means that I can work and collaborate
with other Solidworks users in Solidworks' native format, with no
excuses to the other engineers.

If you come up with such a best, say in the next three years, then I
will donate to your cause three times the cost of a Solidworks license
at that time. There are literally hundreds of other engineers that
would do the same as I would do. When you go for VC keep that in mind.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From gtill60 at gmail.com  Tue Feb 17 20:18:11 2009
From: gtill60 at gmail.com (gtillmon)
Date: Tue, 17 Feb 2009 17:18:11 -0800 (PST)
Subject: Directory
Message-ID: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>

Hello.  I am new to the Python language.
I would like to know how to display and store the path of each mondule
that is called.
Similar to the old READY TRACE in COBOL of long ago.

Thanks,
George


From http  Tue Feb 17 20:36:07 2009
From: http (Paul Rubin)
Date: 17 Feb 2009 17:36:07 -0800
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
Message-ID: <7xr61w8r20.fsf@ruckus.brouhaha.com>

Thomas Allen <thomasmallen at gmail.com> writes:
> attempting. Basically, I'm transforming a live site to a local one and

Something wrong with wget -R ?


From thomasmallen at gmail.com  Tue Feb 17 20:46:06 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 17:46:06 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
	<mailman.165.1234915567.11746.python-list@python.org>
Message-ID: <052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>

On Feb 17, 7:05?pm, Christian Heimes <li... at cheimes.de> wrote:
> Thomas Allen wrote:
> > I'm referring to the same code, but with a print:
>
> > for file in os.listdir(dir):
> > ? ? if os.path.isdir(file):
> > ? ? ? ? print "D", file
>
> > in place of the internal call to absToRel...and only one line prints
> > such a message. I mean, if I can't trust my OS or its Python
> > implementation (on a Windows box) to recognize a directory, I'm
> > wasting everyone's time here.
>
> You are under a wrong assumption. You think os.listdir() returns a list
> of absolute path elements. In fact it returns just a list of names. You
> have to os.path.join(dir, file) to get an absolute path.
>
> Anyway stop reinventing the wheel and use os.walk() as I already
> explained. You can easily spot the depth with "directory.count(os.sep)".
> ?os.path.normpath() helps you to sanitize the path before counting the
> number of os.sep.
>
> Christian

If you'd read the messages in this thread you'd understand why I'm not
using os.walk(): I'm not using it because I need my code to be aware
of the current recursion depth so that the correct number of "../" are
substituted in.

Also, somebody mentioned wget -R...did you mean wget -r? In any case,
I have all of these files locally already and am trying to replace
absolute paths with relative ones so that a colleague can present some
website content at a location with no internet.

Thomas


From python at bdurham.com  Tue Feb 17 20:53:59 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 20:53:59 -0500
Subject: List of locale values for locale.setlocale() under Windows
In-Reply-To: <op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>
References: <1234900820.29552.1300909493@webmail.messagingengine.com>
	<op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1234922039.4722.1300977805@webmail.messagingengine.com>

Gabriel,

> Are you looking for this?
> http://msdn.microsoft.com/en-us/library/hzz3tw78(VS.80).aspx

Yes! Wonderful! 

Thank you,

Malcolm


From lists at cheimes.de  Tue Feb 17 21:08:58 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 03:08:58 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>	<gnfdrg$62o$03$1@news.t-online.com>	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>	<gnffr7$aue$00$1@news.t-online.com>	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>	<mailman.165.1234915567.11746.python-list@python.org>
	<052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
Message-ID: <gnfqjq$crm$1@ger.gmane.org>

Thomas Allen wrote:
> If you'd read the messages in this thread you'd understand why I'm not
> using os.walk(): I'm not using it because I need my code to be aware
> of the current recursion depth so that the correct number of "../" are
> substituted in.

I'm well aware of your messages and your requirements. However you
didn't either read or understand what I was trying to tell you. You
don't need to know the recursion depths in order to find the correct
number of "../".


base = os.path.normpath(base)
baselevel = root.count(os.sep)

for root, dirs, files in os.walk(base):
    level = root.count(os.sep) - baselevel
    offset = level * "../"
    ...

See?

Christian



From thomasmallen at gmail.com  Tue Feb 17 21:19:55 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 18:19:55 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
	<mailman.165.1234915567.11746.python-list@python.org>
	<052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
	<mailman.170.1234922949.11746.python-list@python.org>
Message-ID: <ea3be7b0-f6bc-4949-b9d3-63d6a5687d3e@v19g2000yqn.googlegroups.com>

On Feb 17, 9:08?pm, Christian Heimes <li... at cheimes.de> wrote:
> Thomas Allen wrote:
> > If you'd read the messages in this thread you'd understand why I'm not
> > using os.walk(): I'm not using it because I need my code to be aware
> > of the current recursion depth so that the correct number of "../" are
> > substituted in.
>
> I'm well aware of your messages and your requirements. However you
> didn't either read or understand what I was trying to tell you. You
> don't need to know the recursion depths in order to find the correct
> number of "../".
>
> base = os.path.normpath(base)
> baselevel = root.count(os.sep)
>
> for root, dirs, files in os.walk(base):
> ? ? level = root.count(os.sep) - baselevel
> ? ? offset = level * "../"
> ? ? ...
>
> See?
>
> Christian

Very clever (and now seemingly obvious)! That certainly is one way to
measure directory depth; I hadn't thought of counting the separator.
Sorry that I misunderstood what you meant there.

Thanks,
Thomas


From python at bdurham.com  Tue Feb 17 22:02:24 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 22:02:24 -0500
Subject: Questions on Python 2.6.1 locale module
Message-ID: <1234926144.17948.1300984725@webmail.messagingengine.com>

I've read the latest official locale documentation[1], googled
for additional resources, and have the following questions:
1. Does the following warning still apply to recent releases of
Python (and if so, is this a Python issue, a generic C runtime
issue, or a platform specific C runtime issue)
"... some implementation are broken in such a way that frequent
locale changes may cause core dumps. This makes the locale
somewhat painful to use correctly."
2. Is there a locale-like module that uses hardcoded/cached
locale settings that might support the ability to have different
locale objects? Use cases for such a module:
- ability for threads to support independent locale-type
formatting (via their own private locale object instances)
- ability to generate multi-locale output without flipping
between locales (expensive and potentially buggy)
Note: I understand this wouldn't be a perfect solution given that
the string module's 'constants' are locale sensitive.
3. Where can I find examples of how to use the locale.format()
and locale.format_string() functions? (The documentation for
these functions is too terse for me to understand).
Thank you,
Malcolm
[1] http://docs.python.org/library/locale.html
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From wuwei23 at gmail.com  Tue Feb 17 22:03:51 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:03:51 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
Message-ID: <cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>

On Feb 18, 11:36?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Thomas Allen <thomasmal... at gmail.com> writes:
> > attempting. Basically, I'm transforming a live site to a local one and
>
> Something wrong with wget -R ?

Did you mean wget -r ?

That will just grab the entire site, though. I'm guessing that Thomas'
function absToRel will eventually replace the print with something
that changes links accordingly so the local version is traversable.


From python at bdurham.com  Tue Feb 17 22:09:15 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 22:09:15 -0500
Subject: Best practice for upgrading the version of SQLite bundled with Python
	2.6.1
Message-ID: <1234926555.19179.1300986603@webmail.messagingengine.com>

Are there best practice recommendations for upgrading the version
of SQLite that comes bundled with versions of Python 2.5 and
later?
We're running Python 2.6.1 on Windows and Linux and using the
default version of SQLite that ship with this release.
Today, a new version of SQLite 3.6.11 was released. If we would
like to use this newer version of SQLite, what steps should we
follow for our Windows and Linux versions of Python 2.6.1?
Thank you,
Malcolm
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From wuwei23 at gmail.com  Tue Feb 17 22:28:08 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:28:08 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost> 
	<mailman.134.1234890640.11746.python-list@python.org>
Message-ID: <26c3659d-ce14-4375-9da7-d9fefc4748ac@a39g2000prl.googlegroups.com>

On Feb 18, 3:10?am, Robert Kern <robert.k... at gmail.com> wrote:
> Its public image definitely suffers from the impression that it's "an ORM" that
> can be compared on equal terms with packages that actually are just ORMs. I
> describe it as a very powerful toolkit for solving a wide variety of problems
> involving SQL databases. One of those tools happens to be an ORM.

I'm going to have to steal that description the next time I try to
sell a co-worker on the value of SQLAlchemy. There's always a strong
reaction against the mention of ORMs, generally along the lines of it
moving the programmer too far away from the real action. But my
experience is identical to both andrew's and your's; there is far far
more of value in SQLA than the ORM alone.




From Graham.Dumpleton at gmail.com  Tue Feb 17 22:34:39 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Tue, 17 Feb 2009 19:34:39 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
Message-ID: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>

Why is the multiprocessing module, ie., multiprocessing/process.py, in
_bootstrap() doing:

  os.close(sys.stdin.fileno())

rather than:

  sys.stdin.close()

Technically it is feasible that stdin could have been replaced with
something other than a file object, where the replacement doesn't have
a fileno() method.

In that sort of situation an AttributeError would be raised, which
isn't going to be caught as either OSError or ValueError, which is all
the code watches out for.

Graham


From Graham.Dumpleton at gmail.com  Tue Feb 17 22:47:14 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Tue, 17 Feb 2009 19:47:14 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
Message-ID: <d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>

On Feb 16, 9:27?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 10:34?am, rushen... at gmail.com wrote:
>
>
>
> > Hi everybody,
> > I am an engineer. I am trying to improve my software development
> > abilities. I have started programming with ruby. I like it very much
> > but i want to add something more. According to my previous research i
> > have designed a learning path for myself. It's like something below.
> > ? ? ? 1. Ruby (Mastering as much as possible)
> > ? ? ? 2. Python (Mastering as much as possible)
> > ? ? ? 3. Basic C++ or Basic Java
> > And the story begins here. As i search on the net, ?I have found that
> > because of the natural characteristics of python such as GIL, we are
> > not able to write multi threaded programs. Oooops, in a kind of time
> > with lots of cpu cores and we are not able to write multi threaded
> > programs. That is out of fashion. How a such powerful language doesn't
> > support multi threading. That is a big minus for python. But there is
> > something interesting, something like multi processing. But is it a
> > real alternative for multi threading. As i searched it is not, it
> > requires heavy hardware requirements (lots of memory, lots of cpu
> > power). Also it is not easy to implement, too much extra code...
>
> multiprocessing is already implemented for you in the standard
> library.
> Of course it does not require heavy hardware requirements.
>
> > After all of that, i start to think about omiting python from my
> > carrier path and directly choosing c++ or java. But i know google or
> > youtube uses python very much. How can they choose a language which
> > will be killed by multi threading a time in near future. I like python
> > and its syntax, its flexibility.
>
> > What do you think about multi threading and its effect on python. Why
> > does python have such a break and what is the fix. Is it worth to make
> > investment of time and money to a language it can not take advantage
> > of multi cores?
>
> You can take advantage of multi cores, just not with threads but with
> processes,
> which BTW is the right way to go in most situations. So (assuming you
> are not
> a troll) you are just mistaken in thinking that the only way to
> use multicores is via multithreading.

It is also a mistaken belief that you cannot take advantage of multi
cores with multiple threads inside of a single process using Python.

What no one seems to remember is that when calls are made into Python
extension modules implemented in C code, they have the option of
releasing the Python GIL. By releasing the Python GIL at that point,
it would allow other Python threads to run at the same time as
operations are being done in C code in the extension module.

Obviously if the extension module needs to manipulate Python objects
it will not be able to release the GIL, but not all extension modules
are going to be like this and could have quite sizable sections of
code that can run with the GIL released. Thus, you could have many
threads running at the same time in sections of C code, at same time
as well as currently delegated thread within Python code.

A very good example of this is when embeddeding Python inside of
Apache. So much stuff is actually done inside of Apache C code with
the GIL released, that there is more than ample opportunity for
multiple threads to be running across cores at the same time.

Graham



From wuwei23 at gmail.com  Tue Feb 17 22:56:21 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:56:21 -0800 (PST)
Subject: How do I declare global vars or class vars in Python ?
References: <mailman.114.1234882494.11746.python-list@python.org>
Message-ID: <e798e1f4-e3d8-466d-979d-15bd8dd78cce@r37g2000prr.googlegroups.com>

On Feb 18, 12:54?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class. ?How is this done in Python without setting them
> to a value ?

Generally, you can use the object None to indicate that something has
no value:

class Something(object):
    def __init__(self, a=None, b=None):
        self.a, self.b = a, b
    def dosomething(self):
        # manipulate self.a & self.b here

def main():
    s = Something("value1", "value2")
    s.dosomething()



From sri_annauni at yahoo.co.in  Tue Feb 17 23:19:54 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 18 Feb 2009 09:49:54 +0530 (IST)
Subject: Python Module for console text formatting?
Message-ID: <867965.2501.qm@web7903.mail.in.yahoo.com>


Hi,
Does anyone know any python module other than 'ConsoleFormat0.1.1' used to format text on console?
For example, printing bold characters on console.

Thanks,
Srini


      Did you know? You can CHAT without downloading messenger. Go to http://in.webmessenger.yahoo.com/


From michele.simionato at gmail.com  Tue Feb 17 23:33:46 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 20:33:46 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
Message-ID: <04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>

On Feb 18, 4:47?am, Graham Dumpleton <Graham.Dumple... at gmail.com>
wrote:
> It is also a mistaken belief that you cannot take advantage of multi
> cores with multiple threads inside of a single process using Python.
>
> What no one seems to remember is that when calls are made into Python
> extension modules implemented in C code, they have the option of
> releasing the Python GIL. By releasing the Python GIL at that point,
> it would allow other Python threads to run at the same time as
> operations are being done in C code in the extension module.

You are perfectly right and no one forgot this point,
I am sure. However I think we were answering to the question
"can pure Python code take advantage of multiple CPUs
via multithreading" and the answer is no. Of course a
C extension can do that, but that is beside the point.
It is still worth noticing - as you did -
that some well known Python (+C extension) library -
such as mod_wsgi - is already well equipped to manage
multithreading on multiple cores without any further
effort from the user. This is a good point.

                 Michele Simionato


From cto at openmigration.net  Tue Feb 17 23:34:34 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 17 Feb 2009 23:34:34 -0500
Subject: Python Module for console text formatting?
In-Reply-To: <867965.2501.qm@web7903.mail.in.yahoo.com>
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
Message-ID: <f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>

You can insert those codes just like you would any other character. If
there's enough interest I can whip up a wrapper library for you.

http://www.linux.gr/cgi-bin/man2html?console_codes+4

On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <
sri_annauni at yahoo.co.in> wrote:

>
> Hi,
> Does anyone know any python module other than 'ConsoleFormat0.1.1' used to
> format text on console?
> For example, printing bold characters on console.
>
> Thanks,
> Srini
>
>
>      Did you know? You can CHAT without downloading messenger. Go to
> http://in.webmessenger.yahoo.com/
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at
http://OpenMigration.net.
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From dhbaird at gmail.com  Wed Feb 18 01:13:00 2009
From: dhbaird at gmail.com (David Baird)
Date: Tue, 17 Feb 2009 22:13:00 -0800 (PST)
Subject: Announcing CVExp: A library for making linear programming easier
Message-ID: <f07ba408-091a-4a27-b0f5-468e9c4c9baf@i18g2000prf.googlegroups.com>

Here is the PyPI page:

    http://pypi.python.org/pypi/cvexp/0.1

And here is the homepage:

    http://www.aclevername.com/projects/cvexp/

CVExp currently supports solving linear, integer linear, and quadratic
optimization problems via lpsolve55, GLPK, and CVXOPT.  There are
packages readily available in Debian and Ubuntu for python-glpk and
python-cvxopt, so installation is easy on these platforms:

    apt-get install python-setuptools # for easy_install
    apt-get install python-glpk python-cvxopt
    easy_install cvexp

Here is a quick example of using CVExp+GLPK to solve a problem:

from cvexp.builders import var
from cvexp.builders import integer
from cvexp.builders import minimize
from cvexp.translate_glpk import solve

X = var('X') # the 'X' name is optional
Y = var('Y') # ...and so is 'Y'

sol = solve((
             Y + 0.1 == X,
             Y >= 9.8 - X,
             integer(Y),
             minimize(Y),
           ), out_filename='problem.out') # out_filename is optional
print 'X =', sol[X] # >>> 5.1
print 'Y =', sol[Y] # >>> 5


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 01:42:15 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 04:42:15 -0200
Subject: Best practice for upgrading the version of SQLite bundled with
	Python 2.6.1
References: <1234926555.19179.1300986603@webmail.messagingengine.com>
Message-ID: <op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 01:09:15 -0200, <python at bdurham.com> escribi?:

> Are there best practice recommendations for upgrading the version
> of SQLite that comes bundled with versions of Python 2.5 and
> later?

At least on Windows, you only have to replace sqlite3.dll (in the DLLs  
directory) with the new one, and that's all.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb 18 02:01:36 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 05:01:36 -0200
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <878wo4verq.fsf@agentultra.com>
Message-ID: <op.upjcgy1ox6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 21:12:57 -0200, J Kenneth King <james at agentultra.com>  
escribi?:

> I recently started a project called TracShell
> (http://code.google.com/p/tracshell) where I make heavy use of the
> xmlrpclib core module.
>
> When the number of RPC calls was small, wrapping each call in try/except
> was acceptable. However, this obviously will duplicate code all over the
> place. There are only ever two exceptions that the module itself will
> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
> but not show stoppers.
>
> To combat the duplication, my clever idea was to use a function
> decorator to wrap any function that used xmlrpclib calls:
>
> def catch_errors(fn):
>     """
>     A decorator to catch typical xmlrpclib exceptions
>     """
>     def wrapped(*args, **kwargs):
>         try:
>             return fn(*args, **kwargs)
>         except xmlrpclib.ProtocolError, e:
>             print "There was a problem communicating with the server."
>             print "URL: %s" % e.url
>             print "Headers: %s" % e.headers
>             print "Error code: %d" % e.errcode
>             print "Error message: %s" % e.errmsg
>             print "Please file a report with the TracShell developers."
>             pass
>         except xmlrpclib.Fault, e:
>             print "A fault ocurred"
>             print "Fault code: %d" % e.faultCode
>             print "Fault string: %s" % e.faultString
>             print "If you think this message is the result of an error,"
>             print "please file a report with the TracShell developers."
>             pass
>     return wrapped

I don't like the idea of "hiding" an exception. The caller code doesn't  
know an exception occurred, and just continue doing its work, with bogus  
results... is this what you want? Also, you don't include the stack trace  
- and usually it contains very valuable information. When your users start  
"filing a report with the TracShell developers" and you feel clueless, a  
stack trace is important (you don't have to show it on screen - a log file  
is even better).

If all you want is to customize the error message, use sys.except_hook

Looking into the code, those "pass" statement are useless; and error  
messages are usually written to stderr instead of stdout.

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 02:24:35 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 07:24:35 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
	<39uq66-b7j.ln1@lairds.us>
Message-ID: <pan.2009.02.18.07.24.36@REMOVE.THIS.cybersource.com.au>

On Tue, 17 Feb 2009 14:30:27 +0000, Cameron Laird wrote:

> In article <pan.2009.02.10.22.26.39 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 			.
> 			.
> 			.
>>> And now for my version (which admitedly isn't really mine, and returns
>>> slightly incorrect fib(n) for large values of n, due to the limited
>>> floating point precision).
>>
>>The floating point version is nice, but it starts giving incorrect
>>answers relatively early, from n=71. But if you don't need accurate
>>results (a relative error of 3e-15 for n=71), it is very fast.
> 			.
> 			.
> 			.
> While my personal opinion is that it's silly to characterize an error of
> 3e-15 as not "accurate", 

That's a *relative* error. The absolute error is 1 for n=71, 59 for n=80, 
1196093 for n=100, and 1875662300654090482610609259 for n=200. As far as 
I can tell, the absolute error grows without bounds as n increases -- and 
it overflows at n=1475.

I agree that a relative error is small, and if your use allows it, then 
by all means use the inexact floating point function. But if you need 
exact results, then you won't get it using floats.



> I think more constructive is to focus on the
> fact that the closed-form solution can be touched up to give a precise
> integral solution, while re- taining its (approximately) O(log n)
> run-time cost.

I doubt that. Since both phi and sqrt(5) are irrational numbers, it would 
require an infinite number of integer digits to get precise integral 
solutions unless there was some sort of freakish cancellation. But you 
probably could get a very good integral solution which gives exact 
results up to whatever limit you wanted, bound only by the amount of 
memory and time you were willing to spend.



-- 
Steven


From mail at microcorp.co.za  Wed Feb 18 02:25:24 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 18 Feb 2009 09:25:24 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
Message-ID: <004901c9919a$284b89c0$0d00a8c0@hendrik>

"gert" <gert.cuykens at gmail.com>wrote:


> After reading the docs and seeing a few examples i think this should
> work ?
> Am I forgetting something here or am I doing something stupid ?
> Anyway I see my yellow screen, that has to count for something :)
> 
> from tkinter import *
> from threading import Thread
> 
> class Weegbrug(Thread):
>     def __init__(self,v):
>         self.v=v
>         Thread.__init__(self)
>     def run(self):
>         while True:
>             with open('com1','r') as f:
>                  for line in f:
>                      self.v.set(line[2:-1])

It is in general not a good idea to directly
access GUI variables from outside the
GUI main loop.
There is a recipe for doing this sort of thing,
but as usual I have lost the reference.
What it does is that instead of interfering directly
as above, you put the data on a queue.

Then, you use the after() call to set up a call
to a routine that reads the queue, and configures the
display, and then uses after again to call itself again
after a time, thereby keeping the GUI stuff in the GUI 
mainloop.

HTH - Hendrik





From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 02:55:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 07:55:41 GMT
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
Message-ID: <pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 07:08:04 +1100, Jervis Whitley wrote:


>> This moves the for-loop out of slow Python into fast C and should be
>> much, much faster for very large input.
>>
>>
> _Should_ be faster.

Yes, Python's timing results are often unintuitive.


> Here is my test on an XP system Python 2.5.4. I had similar results on
> python 2.7 trunk.
...
> **no vowels**
> any: [0.36063678618957751, 0.36116506191682773, 0.36212355395824081]
> for: [0.24044885376801672, 0.2417684017413404, 0.24084797257163482]

I get similar results.

...
> **BIG word vowel 'U' final char**
> any: [8.0007259193539895, 7.9797344140269644, 7.8901742633514012] for:
> [7.6664422372764101, 7.6784683633957584, 7.6683055766498001]

Well, I did say "for very large input". 10000 chars isn't "very large" -- 
that's only 9K. Try this instead:

>>> BIGWORD = 'g' * 500000 + 'U'  # less than 500K of text
>>>
>>> Timer("for_test(BIGWORD)", setup).repeat(number=1000)
[4.7292280197143555, 4.633030891418457, 4.6327309608459473]
>>> Timer("any_test(BIGWORD)", setup).repeat(number=1000)
[4.7717428207397461, 4.6366970539093018, 4.6367099285125732]

The difference is not significant. What about bigger?


>>> BIGWORD = 'g' * 5000000 + 'U'  # less than 5MB 
>>>
>>> Timer("for_test(BIGWORD)", setup).repeat(number=100)
[4.8875839710235596, 4.7698030471801758, 4.769787073135376]
>>> Timer("any_test(BIGWORD)", setup).repeat(number=100)
[4.8555209636688232, 4.8139419555664062, 4.7710208892822266]

It seems to me that I was mistaken -- for large enough input, the running 
time of each version converges to approximately the same speed.

What happens when you have hundreds of megabytes, I don't know.


-- 
Steven


From timr at probo.com  Wed Feb 18 03:15:00 2009
From: timr at probo.com (Tim Roberts)
Date: Wed, 18 Feb 2009 00:15:00 -0800
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <qignp4pa2mbcbcaq413p0ims2j7tp287nb@4ax.com>

laplacian42 at gmail.com wrote:
>
>> For applications installing the full wxWidgets or Qt toolkits would be
>> less disk space and dependcies than OceanGUI
>
>What? Qt and wX are *huge* compared to OcempGUI.

Well, not compared to OcempGUI + SDL + PyGame.  Note that I'm not trying to
run down the product at all, but if you're going to make comparisons like
this, you really need to be fair about it.

>> and performance would probably be higher.
>
>Probably, but wX and Qt are written in C++. OcempGUI is pure Python,
>which would make it easier for the Python community to help extend,
>optimize, and maintain.

Again, that's hardly fair.  OcempGUI is only pure Python because it
requires the C libraries SDL and PyGame.  wxPython is basically pure
Python, also, if you don't count the C++ wxWidgets library underneath it.

As you say, if you are already using SDL and PyGame, this sounds like a
great solution.  But for someone starting from scratch, it's not yet clear
to me that OcempGUI substantially better than wx.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tim--at-- at frontier--dot--.net  Wed Feb 18 03:17:40 2009
From: tim--at-- at frontier--dot--.net (Tim H)
Date: Wed, 18 Feb 2009 01:17:40 -0700
Subject: urllib confusion
Message-ID: <qrmdnUaVbbGuWQbUnZ2dnUVZ_hGdnZ2d@brainstorminternet.net>

When I attempt to open 2 different pages on the same site I get 2 copies 
of the first page. ??

ie

links = [ 'http://site.org/foo/1/bar',
           'http://site.org/foo/2/bar' ]

for url in links:
	print "url:", url
	f = urlopen(url, params)
	print "Actual url:", f.geturl()
	print f.read()
	f.close()


results in:

url: http://site.org/foo/1/bar
Actual url: http://site.org/foo/1/bar
page 1 contents
url: http://site.org/foo/2/bar
Actual url: http://site.org/foo/1/bar
page 1 contents

f.getinfo() shows two different session ID's

Any thoughts?

Thanks,
Tim
	
WinXP-x64
python 2.6.1 x64


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 03:33:08 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 08:33:08 GMT
Subject: urllib confusion
References: <qrmdnUaVbbGuWQbUnZ2dnUVZ_hGdnZ2d@brainstorminternet.net>
Message-ID: <pan.2009.02.18.08.33.08@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 01:17:40 -0700, Tim H wrote:

> When I attempt to open 2 different pages on the same site I get 2 copies
> of the first page. ??
...
> Any thoughts?

What does your browser do?

What does your browser do if you turn off cookies, re-directions and/or 
referers?



-- 
Steven


From pavlovevidence at gmail.com  Wed Feb 18 03:56:10 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 00:56:10 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com>

On Feb 17, 3:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hello all,
>
> On a previous thread (http://groups.google.com/group/comp.lang.python/
> browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> binary data. Briefly, my data consists of complex numbers, 32-bit
> floats for real and imaginary parts. The data is stored as 4 bytes
> Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> row-major format. I needed to read the data in as two separate numpy
> arrays, one for real values and one for imaginary values.
>
> There were several very helpful performance tips offered, and one in
> particular I've started looking into. The author suggested a
> "numpy.memmap" object may be beneficial. It was suggested I use it as
> follows:
>
> descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> print "First 100 real values:", data.r[:100]
>
> I have two questions:
> 1) What is "recarray"?

Let's look:

[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> numpy.recarray
<class 'numpy.core.records.recarray'>
>>> help(numpy.recarray)

Help on class recarray in module numpy.core.records:

class recarray(numpy.ndarray)
 |  recarray(shape, dtype=None, buf=None, **kwds)
 |
 |  Subclass of ndarray that allows field access using attribute
lookup.
 |
 |  Parameters
 |  ----------
 |  shape : tuple
 |      shape of record array
 |  dtype : data-type or None
 |      The desired data-type.  If this is None, then the data-type is
determine
 |      by the *formats*, *names*, *titles*, *aligned*, and
*byteorder* keywords
 |  buf : [buffer] or None
 |      If this is None, then a new array is created of the given
shape and data
 |      If this is an object exposing the buffer interface, then the
array will
 |      use the memory from an existing buffer.  In this case, the
*offset* and
 |      *strides* keywords can also be used.
...


So there you have it.  It's a subclass of ndarray that allows field
access using attribute lookup.  (IOW, you're creating a view of the
memmap'ed data of type recarray, which is the type numpy uses to
access structures by name.  You need to create the view because
regular numpy arrays, which numpy.memmap creates, can't access fields
by attribute.)

help() is a nice thing to use, and numpy is one of the better
libraries when it comes to docstrings, so learn to use it.


> 2) The documentation for numpy.memmap claims that it is meant to be
> used in situations where it is beneficial to load only segments of a
> file into memory, not the whole thing. This is definately something
> I'd like to be able to do as my files are frequently >1Gb. I don't
> really see in the diocumentation how portions are loaded, however.
> They seem to create small arrays and then assign the entire array
> (i.e. file) to the memmap object. Let's assume I have a binary data
> file of complex numbers in the format described above, and let's
> assume that the size of the complex data array (that is, the entire
> file) is 100x100 (rows x columns). Could someone please post a few
> lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> right 50 x 50 quadrant into memmap objects? Thank you very much in
> advance!


You would memmap the whole region in question (in this case the whole
file), then take a slice.  Actually you could get away with memmapping
just the last 50 rows (bottom half).  The offset into the file would
be 50*100*8, so:

data = memmap(filename, dtype=descriptor, mode='r',offset=
(50*100*8)).view(recarray)
reshaped_data = reshape(data,(50,100))
intersting_data = reshaped_data[:,50:100]


A word of caution: Every instance of numpy.memmap creates its own mmap
of the whole file (even if it only creates an array from part of the
file).  The implications of this are A) you can't use numpy.memmap's
offset parameter to get around file size limitations, and B) you
shouldn't create many numpy.memmaps of the same file.  To work around
B, you should create a single memmap, and dole out views and slices.


Carl Banks


From justinli79 at gmail.com  Wed Feb 18 03:59:20 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 00:59:20 -0800 (PST)
Subject: Building python with sqlite3
Message-ID: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>


I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
make, make install, to import sqlite3 leads to ImportError. It looks
like I have to build Python with sqlite. I have sqlite3 installed on
my system. How should I build Python with it? I did not find any
options relating with sqlite3 of configure and Makefile.

Thanks in Advance!
Justin


From mzagursk at gmail.com  Wed Feb 18 04:00:28 2009
From: mzagursk at gmail.com (mzagursk at gmail.com)
Date: Wed, 18 Feb 2009 01:00:28 -0800 (PST)
Subject: Calling a script requiring user input from another script
Message-ID: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>

I'm kind of new to this so bear with me.

I have a script made that requires user input (lets call it script A)
while it's running.  However, I would like to create another script
(script B) that can batch process (i.e. run script A over and over
with different user inputs based on script B).  Is this possible?  and
how so?  Thanks in advance.


From rt8396 at gmail.com  Wed Feb 18 04:02:22 2009
From: rt8396 at gmail.com (r)
Date: Wed, 18 Feb 2009 01:02:22 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
Message-ID: <9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>

Hello Josh,
Blender is a lost cause. It is a powerful app but the UI is horrible.
Even the Blender folks admit only a complete rewrite could solve the
major flaws that plague the design. So maybe i could salvage some code
but for what i have in mind, Blender will look like a piece of
software from the middle ages. And i am absolutly only looking to do
this in 3D, 2D is boring.

So, yes, i have looked at both the applications you offer.

Thanks


From rt8396 at gmail.com  Wed Feb 18 04:10:31 2009
From: rt8396 at gmail.com (r)
Date: Wed, 18 Feb 2009 01:10:31 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<mailman.168.1234919426.11746.python-list@python.org>
Message-ID: <845c0b97-8644-448a-b5f7-06da727cf466@n10g2000vbl.googlegroups.com>

Yes i want linux, windows, and mac support. I think you are good for a
few years though :). Getting something up and working is the easy
part. Adding all the features that are required to compete with
something the likes of SolidWorks or ACAD  takes time.

One way or another i am going to build this, whether or not it takes
off and gets to a professional level -- only time will tell. I know
one thing for sure the need is there, the product is not.


From catphive at catphive.net  Wed Feb 18 04:11:09 2009
From: catphive at catphive.net (Brendan Miller)
Date: Wed, 18 Feb 2009 01:11:09 -0800
Subject: PyYaml in standard library?
Message-ID: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>

I'm just curious whether PyYaml is likely to end up in the standard
library at some point?


From lists at cheimes.de  Wed Feb 18 04:13:29 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 10:13:29 +0100
Subject: Building python with sqlite3
In-Reply-To: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
Message-ID: <gngjfp$75i$1@ger.gmane.org>

Justin Li schrieb:
> I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> make, make install, to import sqlite3 leads to ImportError. It looks
> like I have to build Python with sqlite. I have sqlite3 installed on
> my system. How should I build Python with it? I did not find any
> options relating with sqlite3 of configure and Makefile.

Do you have the development files installed as well? Run "make" again
and look at the list of missing modules.

Christian



From clp2 at rebertia.com  Wed Feb 18 04:18:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 01:18:33 -0800
Subject: Calling a script requiring user input from another script
In-Reply-To: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>
References: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>
Message-ID: <50697b2c0902180118qf4e02erb10fba5d4d3f0e46@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:00 AM, mzagursk at gmail.com <mzagursk at gmail.com> wrote:
> I'm kind of new to this so bear with me.
>
> I have a script made that requires user input (lets call it script A)
> while it's running.  However, I would like to create another script
> (script B) that can batch process (i.e. run script A over and over
> with different user inputs based on script B).  Is this possible?  and
> how so?  Thanks in advance.

Define a function in A that lets its functionality be used
programmatically. Then use the `if __name__ == "__main__"` trick to
have A take input from the user and call the function you just defined
 with the user input if it's run as a script.

In B, import A's function and call it repeatedly on the inputs.

Example (assume addition is A's fancy functionality):

#A.py BEFORE:
while True:
    input_ = raw_input()
    if input_ == "exit":
        break
    x = int(input_)
    y = int(raw_input())
    print x + y

#A.py AFTER:
#functionality refactored into a function
def add(x, y):
    return x + y

if __name__ == "__main__":
    while True:
        if input_ == "exit":
            break
        x = int(input_)
        y = int(raw_input())
        print add(x, y)#use the function

#B.py
from A import add

for i,j in some_input_pairs:
    add(i, j)#use the function


Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tomanishkb at gmail.com  Wed Feb 18 04:31:13 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Wed, 18 Feb 2009 15:01:13 +0530
Subject: Python-list Digest, Vol 65, Issue 365
In-Reply-To: <mailman.747.1234948421.11745.python-list@python.org>
References: <mailman.747.1234948421.11745.python-list@python.org>
Message-ID: <783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>

I think the given statement below will give you what you r looking
<imported module name>.__file__print

On Wed, Feb 18, 2009 at 2:43 PM, <python-list-request at python.org> wrote:

> Send Python-list mailing list submissions to
>        python-list at python.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>        http://mail.python.org/mailman/listinfo/python-list
> or, via email, send a message with subject or body 'help' to
>        python-list-request at python.org
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> You can reach the person managing the list at
>        python-list-owner at python.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Python-list digest..."
>
> Today's Topics:
>
>   1. Directory (gtillmon)
>   2. Re: Is there something easier than ORM? (Michele Simionato)
>   3. Re: flexible find and replace ? (OdarR)
>   4. Re: urllib confusion (Steven D'Aprano)
>   5. Re: numpy.memmap advice? (Carl Banks)
>   6. Building python with sqlite3 (Justin Li)
>   7. Calling a script requiring user input from another script
>      (mzagursk at gmail.com)
>   8. Re: Python 3D CAD -- need collaborators, or just brave souls
>      :) (r)
>   9. PyYaml in standard library? (Brendan Miller)
>  10. Re: Building python with sqlite3 (Christian Heimes)
>
>
> ---------- Forwarded message ----------
> From: gtillmon <gtill60 at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 17:18:11 -0800 (PST)
> Subject: Directory
> Hello.  I am new to the Python language.
> I would like to know how to display and store the path of each mondule
> that is called.
> Similar to the old READY TRACE in COBOL of long ago.
>
> Thanks,
> George
>
>
>
> ---------- Forwarded message ----------
> From: Michele Simionato <michele.simionato at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 08:46:02 -0800 (PST)
> Subject: Re: Is there something easier than ORM?
> On Feb 17, 5:35 pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> >
> > I don't intend this as a criticism of SqlAlchemy. On the contrary I am
> > impressed by what it does. But I often see people promoting ORM as the
> > solution to all database access problems, and I certainly don't feel
> > like it is.
>
> I am also not a big fan of ORM, especially in situations where you
> have
> performance issues and you are using database specific features. In
> such situations
> you don't care about portability, but you care about having your SQL
> explicit,
> so that you can run it directly under the profiler.
>
>
>
> ---------- Forwarded message ----------
> From: OdarR <Olivier.Darge at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 11:29:19 -0800 (PST)
> Subject: Re: flexible find and replace ?
> Thanks to everybody.
> I need to test your propositions now :)
>
> Olivier
>
>
>
> ---------- Forwarded message ----------
> From: Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> To: python-list at python.org
> Date: 18 Feb 2009 08:33:08 GMT
> Subject: Re: urllib confusion
> On Wed, 18 Feb 2009 01:17:40 -0700, Tim H wrote:
>
> > When I attempt to open 2 different pages on the same site I get 2 copies
> > of the first page. ??
> ...
> > Any thoughts?
>
> What does your browser do?
>
> What does your browser do if you turn off cookies, re-directions and/or
> referers?
>
>
>
> --
> Steven
>
>
>
> ---------- Forwarded message ----------
> From: Carl Banks <pavlovevidence at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 00:56:10 -0800 (PST)
> Subject: Re: numpy.memmap advice?
> On Feb 17, 3:08 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > Hello all,
> >
> > On a previous thread (http://groups.google.com/group/comp.lang.python/
> > browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> > hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> > binary data. Briefly, my data consists of complex numbers, 32-bit
> > floats for real and imaginary parts. The data is stored as 4 bytes
> > Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> > row-major format. I needed to read the data in as two separate numpy
> > arrays, one for real values and one for imaginary values.
> >
> > There were several very helpful performance tips offered, and one in
> > particular I've started looking into. The author suggested a
> > "numpy.memmap" object may be beneficial. It was suggested I use it as
> > follows:
> >
> > descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> > data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> > print "First 100 real values:", data.r[:100]
> >
> > I have two questions:
> > 1) What is "recarray"?
>
> Let's look:
>
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import numpy
> >>> numpy.recarray
> <class 'numpy.core.records.recarray'>
> >>> help(numpy.recarray)
>
> Help on class recarray in module numpy.core.records:
>
> class recarray(numpy.ndarray)
>  |  recarray(shape, dtype=None, buf=None, **kwds)
>  |
>  |  Subclass of ndarray that allows field access using attribute
> lookup.
>  |
>  |  Parameters
>  |  ----------
>  |  shape : tuple
>  |      shape of record array
>  |  dtype : data-type or None
>  |      The desired data-type.  If this is None, then the data-type is
> determine
>  |      by the *formats*, *names*, *titles*, *aligned*, and
> *byteorder* keywords
>  |  buf : [buffer] or None
>  |      If this is None, then a new array is created of the given
> shape and data
>  |      If this is an object exposing the buffer interface, then the
> array will
>  |      use the memory from an existing buffer.  In this case, the
> *offset* and
>  |      *strides* keywords can also be used.
> ...
>
>
> So there you have it.  It's a subclass of ndarray that allows field
> access using attribute lookup.  (IOW, you're creating a view of the
> memmap'ed data of type recarray, which is the type numpy uses to
> access structures by name.  You need to create the view because
> regular numpy arrays, which numpy.memmap creates, can't access fields
> by attribute.)
>
> help() is a nice thing to use, and numpy is one of the better
> libraries when it comes to docstrings, so learn to use it.
>
>
> > 2) The documentation for numpy.memmap claims that it is meant to be
> > used in situations where it is beneficial to load only segments of a
> > file into memory, not the whole thing. This is definately something
> > I'd like to be able to do as my files are frequently >1Gb. I don't
> > really see in the diocumentation how portions are loaded, however.
> > They seem to create small arrays and then assign the entire array
> > (i.e. file) to the memmap object. Let's assume I have a binary data
> > file of complex numbers in the format described above, and let's
> > assume that the size of the complex data array (that is, the entire
> > file) is 100x100 (rows x columns). Could someone please post a few
> > lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> > right 50 x 50 quadrant into memmap objects? Thank you very much in
> > advance!
>
>
> You would memmap the whole region in question (in this case the whole
> file), then take a slice.  Actually you could get away with memmapping
> just the last 50 rows (bottom half).  The offset into the file would
> be 50*100*8, so:
>
> data = memmap(filename, dtype=descriptor, mode='r',offset=
> (50*100*8)).view(recarray)
> reshaped_data = reshape(data,(50,100))
> intersting_data = reshaped_data[:,50:100]
>
>
> A word of caution: Every instance of numpy.memmap creates its own mmap
> of the whole file (even if it only creates an array from part of the
> file).  The implications of this are A) you can't use numpy.memmap's
> offset parameter to get around file size limitations, and B) you
> shouldn't create many numpy.memmaps of the same file.  To work around
> B, you should create a single memmap, and dole out views and slices.
>
>
> Carl Banks
>
>
>
> ---------- Forwarded message ----------
> From: Justin Li <justinli79 at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 00:59:20 -0800 (PST)
> Subject: Building python with sqlite3
>
> I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> make, make install, to import sqlite3 leads to ImportError. It looks
> like I have to build Python with sqlite. I have sqlite3 installed on
> my system. How should I build Python with it? I did not find any
> options relating with sqlite3 of configure and Makefile.
>
> Thanks in Advance!
> Justin
>
>
>
> ---------- Forwarded message ----------
> From: "mzagursk at gmail.com" <mzagursk at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:00:28 -0800 (PST)
> Subject: Calling a script requiring user input from another script
> I'm kind of new to this so bear with me.
>
> I have a script made that requires user input (lets call it script A)
> while it's running.  However, I would like to create another script
> (script B) that can batch process (i.e. run script A over and over
> with different user inputs based on script B).  Is this possible?  and
> how so?  Thanks in advance.
>
>
>
> ---------- Forwarded message ----------
> From: r <rt8396 at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:02:22 -0800 (PST)
> Subject: Re: Python 3D CAD -- need collaborators, or just brave souls :)
> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.
>
> So, yes, i have looked at both the applications you offer.
>
> Thanks
>
>
>
> ---------- Forwarded message ----------
> From: Brendan Miller <catphive at catphive.net>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:11:09 -0800
> Subject: PyYaml in standard library?
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?
>
>
>
> ---------- Forwarded message ----------
> From: Christian Heimes <lists at cheimes.de>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 10:13:29 +0100
> Subject: Re: Building python with sqlite3
> Justin Li schrieb:
> > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > make, make install, to import sqlite3 leads to ImportError. It looks
> > like I have to build Python with sqlite. I have sqlite3 installed on
> > my system. How should I build Python with it? I did not find any
> > options relating with sqlite3 of configure and Makefile.
>
> Do you have the development files installed as well? Run "make" again
> and look at the list of missing modules.
>
> Christian
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards,

Maneesh KB

Comat Technologies

Bangalore

Mob: 9740-192309



We work with the underprivileged and in rural India. If you are interested
to be a part of it, please mail or call me. I will be happy to share and
inform - http://www.comat.com
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From rdmurray at bitdance.com  Wed Feb 18 04:34:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 18 Feb 2009 09:34:07 +0000 (UTC)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
Message-ID: <gngkme$bde$1@ger.gmane.org>

alex23 <wuwei23 at gmail.com> wrote:
> On Feb 18, 11:36=A0am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> > Thomas Allen <thomasmal... at gmail.com> writes:
> > > attempting. Basically, I'm transforming a live site to a local one and
> >
> > Something wrong with wget -R ?
> 
> Did you mean wget -r ?
> 
> That will just grab the entire site, though. I'm guessing that Thomas'
> function absToRel will eventually replace the print with something
> that changes links accordingly so the local version is traversable.

Yeah, but wget -r -k will do that bit of it, too.

--RDM



From clp2 at rebertia.com  Wed Feb 18 04:34:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 01:34:08 -0800
Subject: PyYaml in standard library?
In-Reply-To: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
Message-ID: <50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:11 AM, Brendan Miller <catphive at catphive.net> wrote:
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?

I don't personally have a direct answer to your question, but I can
point out that JSON and YAML are mostly compatible (JSON is almost a
perfect YAML subset) and the `json` module is already in the Python
std lib.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From wuwei23 at gmail.com  Wed Feb 18 04:51:34 2009
From: wuwei23 at gmail.com (alex23)
Date: Wed, 18 Feb 2009 01:51:34 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
Message-ID: <c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>

On Feb 18, 7:34?pm, rdmur... at bitdance.com wrote:
> Yeah, but wget -r -k will do that bit of it, too.

Wow, nice, I don't know why I never noticed that. Cheers!



From mal at egenix.com  Wed Feb 18 06:36:45 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 18 Feb 2009 12:36:45 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <499BF2CD.5060807@egenix.com>

On 2009-02-17 13:27, ??? wrote:
> Hi all,
> 
> Recently I am studying some python ORM libraries, such as sqlalchemy.
> 
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
> 
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
> 
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
> 
> So is there some libraries like that?

Python has a DB-API standard for direct access to databases using
a very simple cursor-based approach:

    http://www.python.org/dev/peps/pep-0249/

All the DB-API compatible modules provide such an interface:

    http://wiki.python.org/moin/DatabaseInterfaces

> Or is there some tools that could generate code from database scheme
> as I want?

I am not aware of an automated tool for generating SQL queries
in form of Python functions, but it is certainly possible to write
one by tapping into the system tables of the database of your
choice.

Our database tools mxODBC and mxODBC Connect come with a set of
catalog methods that make such introspection very easy across
databases and platforms:

    http://www.egenix.com/products/python/mxODBC/
    http://www.egenix.com/products/python/mxODBCConnect/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 18 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From pofuk at email.t-com.hr  Wed Feb 18 07:09:24 2009
From: pofuk at email.t-com.hr (SMALLp)
Date: Wed, 18 Feb 2009 13:09:24 +0100
Subject: os.popen encoding!
Message-ID: <gngtpj$1fi$1@ss408.t-com.hr>

Hy.
I'm playing with os.popen function.
a = os.popen("somecmd").read()

If one of the lines contains characters like "?", "?"or any other it loks 
line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:

for i in a:
    print i:

How to solve this and where exectly is problem with print or read! Windows 
XP, Python 2.5.4

Thanks! 




From tim.wintle at teamrubber.com  Wed Feb 18 07:19:04 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 12:19:04 +0000
Subject: memory recycling/garbage collecting problem
In-Reply-To: <gnen5t$fjm$1@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
	<1234879826.7672.11.camel@tim-laptop>  <gnen5t$fjm$1@ger.gmane.org>
Message-ID: <1234959544.30417.8.camel@tim-laptop>

On Tue, 2009-02-17 at 17:04 +0100, Christian Heimes wrote:
> Tim Wintle wrote:
> > Basically malloc() and free() are computationally expensive, so Python
> > tries to call them as little as possible - but it's quite clever at
> > knowing what to do - e.g. if a list has already grown large then python
> > assumes it might grow large again and keeps hold of a percentage of the
> > memory.
> 
> You are almost right. Python's mutable container types like have a
> non-linear growth rate.
> 
> >From the file listobject.c
> 
> /*
> This over-allocates proportional to the list size, making room
> for additional growth.  The over-allocation is mild, but is
> enough to give linear-time amortized behavior over a long
> sequence of appends() in the presence of a poorly-performing
> system realloc().
> The growth pattern is:  0, 4, 8, 16, 25, 35, 46, 58, 72, 88, ...
> */
> 
> new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);

Sorry, I think I didn't phrase myself very well - I was trying to
explain that de-allocation of memory follows different scaling behaviour
to allocation - so a large list that's shrunk is likely to take more
memory than a small list that's grown i.e. the part just above your
quote:


/* 
Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize.  If the newsize falls lower than half
the allocated size, then proceed with the realloc() to shrink the list.
*/
if (allocated >= newsize && newsize >= (allocated >> 1)) {
	assert(self->ob_item != NULL || newsize == 0);
	Py_SIZE(self) = newsize;
	return 0;
}


it's all very clever stuff btw.




From dfnsonfsduifb at gmx.de  Wed Feb 18 07:36:17 2009
From: dfnsonfsduifb at gmx.de (Johannes Bauer)
Date: Wed, 18 Feb 2009 13:36:17 +0100
Subject: Searching Google?
In-Reply-To: <mailman.166.1234917814.11746.python-list@python.org>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
Message-ID: <702dm1FkrikgU1@mid.dfncis.de>

Curt Hash schrieb:

> You just need to change your User-Agent so that Google doesn't know a
> Python script is making the request:

Why would Google not send a response if the User-Agent header field is
not a recognized browser? I doubt that's what's happening and the OP
would just like the convenience of a search API instead of parsing the
web page (like other applications do). Ugly, but it works.

Regards,
Johannes

-- 
"Meine Gegenklage gegen dich lautet dann auf bewusste Verlogenheit,
verl?sterung von Gott, Bibel und mir und bewusster Blasphemie."
         -- Prophet und Vision?r Hans Joss aka HJP in de.sci.physik
                         <48d8bf1d$0$7510$5402220f at news.sunrise.ch>


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 07:38:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 10:38:54 -0200
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
Message-ID: <op.upjr24vfx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 10:09:24 -0200, SMALLp <pofuk at email.t-com.hr> escribi?:

> Hy.
> I'm playing with os.popen function.
> a = os.popen("somecmd").read()
>
> If one of the lines contains characters like "?", "?"or any other it loks
> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>
> for i in a:
>     print i:
>

'\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E WITH  
GRAVE' Unicode code point u'?' encoded in the Windows-1252 encoding (and  
latin-1, and others too). This is the usual Windows encoding (in "Western  
Europe" but seems to cover a much larger part of the world... most of  
America, if not all).

When you *look* at some string in the interpreter, you see its repr()  
(note the surrounding quotes). When you *print* some string, you get its  
contents:

py> s = "ma m?re"
py> s
'ma m\x8are'
py> print s
ma m?re
py> print repr(s)
'ma m\x8are'

> How to solve this and where exectly is problem with print or read!  
> Windows
> XP, Python 2.5.4

There is *no* problem. You should read the Unicode howto:  
<http://docs.python.org/howto/unicode.html>
If you still think there is a problem, please provide more details.

-- 
Gabriel Genellina



From mad.vijay at gmail.com  Wed Feb 18 08:23:26 2009
From: mad.vijay at gmail.com (SamG)
Date: Wed, 18 Feb 2009 05:23:26 -0800 (PST)
Subject: Crypto headaches.
Message-ID: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>

Hi,

Using the python's Crypto.Cipher.Blowfish is create and encrypted file
in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
error stating "bad magic number".

I tried
$ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
or
$ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file

BTW, decryption using a python code works well. But i m of the
impression a file encry with one program should/can be decrypt with
another program (in my case openssl) using the same parameters.

Pls help.

SamG


From gabriel.rossetti at arimaz.com  Wed Feb 18 08:43:51 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Wed, 18 Feb 2009 14:43:51 +0100
Subject: Python/environment problem with char encoding/decoding
Message-ID: <499C1097.5000505@arimaz.com>

Hello everyone,

I originally posted this on the Twisted mailing list, but now it seams 
to be  a more general python/environment problem. If I run the attached 
example in Eclipse, it works, if I run it from a terminal, it doesn't, I 
get :

$ python xml_parser_test.py
Traceback (most recent call last):
  File "xml_parser_test.py", line 30, in <module>
    res = rawXmlToElement("<t>re?u</t>")
  File "xml_parser_test.py", line 21, in __call__
    tmp.addRawXml(s)
  File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py", 
line 538, in addRawXml
    self.children.append(SerializedXML(rawxmlstring))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5: 
ordinal not in range(128)

Does anyone understand why it doesn't work outside of Eclipse? My OS is 
Linux (Ubuntu 8.04).

Thank you,
Gabriel
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From hniksic at xemacs.org  Wed Feb 18 09:00:17 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Wed, 18 Feb 2009 15:00:17 +0100
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
Message-ID: <87ocwzzvym.fsf@mulj.homelinux.net>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

>> I'm playing with os.popen function.
>> a = os.popen("somecmd").read()
>>
>> If one of the lines contains characters like "?", "?"or any other it loks
>> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>>
>> for i in a:
>>     print i:
>
> '\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E
> WITH  GRAVE' Unicode code point u'?' encoded in the Windows-1252
> encoding (and  latin-1, and others too).

Note that it is also 'LATIN SMALL LETTER C WITH CARON' (U+010D or
u'?'), encoded in Windows-1250, which is what the OP is likely using.

The rest of your message stands regardless: there is no problem, at
least as long as the OP only prints out the character received from
somecmd to something else that also expects Windows-1250.  The problem
would arise if the OP wanted to store the string in a PyGTK label
(which expects UTF8) or send it to a web browser (which expects
explicit encoding, probably defaulting to UTF8), in which case he'd
have to disambiguate whether '\xe8' refers to U+010D or to U+00E8 or
something else entirely.

That is the problem that Python 3 solves by requiring (or strongly
suggesting) that such disambiguation be performed as early in the
program as possible, preferrably while the characters are being read
from the outside source.  A similar approach is possible using Python
2 and its unicode type, but since the OP never specified exactly which
problem he had (except for the repr/str confusion), it's hard to tell
if using the unicode type would help.


From mal at egenix.com  Wed Feb 18 09:10:42 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 18 Feb 2009 15:10:42 +0100
Subject: Crypto headaches.
In-Reply-To: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
References: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
Message-ID: <499C16E2.7060102@egenix.com>

On 2009-02-18 14:23, SamG wrote:
> Hi,
> 
> Using the python's Crypto.Cipher.Blowfish is create and encrypted file
> in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
> error stating "bad magic number".

Are you getting the error message from openssl ? It looks a lot
like an error message from Python.

> I tried
> $ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
> or
> $ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file
> 
> BTW, decryption using a python code works well. But i m of the
> impression a file encry with one program should/can be decrypt with
> another program (in my case openssl) using the same parameters.

Ideally, that should work, but you also have to make sure that
the following two details are the same for both applications:

 1. the way padding is done (Blowfish is a block cipher)

 2. the way the initialization vector is set

Otherwise the two won't interoperate properly.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 18 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From __peter__ at web.de  Wed Feb 18 09:12:02 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 15:12:02 +0100
Subject: Python/environment problem with char encoding/decoding
References: <mailman.190.1234965056.11746.python-list@python.org>
Message-ID: <gnh4vf$rp0$02$1@news.t-online.com>

Gabriel Rossetti wrote:

> Hello everyone,
> 
> I originally posted this on the Twisted mailing list, but now it seams
> to be  a more general python/environment problem. If I run the attached
> example in Eclipse, it works, if I run it from a terminal, it doesn't, I
> get :
> 
> $ python xml_parser_test.py
> Traceback (most recent call last):
>   File "xml_parser_test.py", line 30, in <module>
>     res = rawXmlToElement("<t>re?u</t>")
>   File "xml_parser_test.py", line 21, in __call__
>     tmp.addRawXml(s)
>   File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py",
> line 538, in addRawXml
>     self.children.append(SerializedXML(rawxmlstring))
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
> ordinal not in range(128)
> 
> Does anyone understand why it doesn't work outside of Eclipse? My OS is
> Linux (Ubuntu 8.04).

On the contrary, I don't understand why it would work in Eclipse ;)

addRawXml(s) seems to be a fancy way to create a unicode string, and
unicode(s) will work either if s is a bytestring that doesn't contain any
non-ascii characters or if s is a unicode string (at least these are the
relevant cases here).

Try changing your program to use a unicode literal:

# -*- coding: utf-8 -*-
...
if ...
    res = rawXmlToElement(u"<t>re?u</t>")

Peter


From benjamin.kaplan at case.edu  Wed Feb 18 09:14:39 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 18 Feb 2009 09:14:39 -0500
Subject: Python/environment problem with char encoding/decoding
In-Reply-To: <499C1097.5000505@arimaz.com>
References: <499C1097.5000505@arimaz.com>
Message-ID: <ec96e1390902180614u224f0c0bmc8450cfee79de910@mail.gmail.com>

On Wed, Feb 18, 2009 at 8:43 AM, Gabriel Rossetti <
gabriel.rossetti at arimaz.com> wrote:

> Hello everyone,
>
> I originally posted this on the Twisted mailing list, but now it seams to
> be  a more general python/environment problem. If I run the attached example
> in Eclipse, it works, if I run it from a terminal, it doesn't, I get :
>
> $ python xml_parser_test.py
> Traceback (most recent call last):
>  File "xml_parser_test.py", line 30, in <module>
>   res = rawXmlToElement("<t>re?u</t>")
>  File "xml_parser_test.py", line 21, in __call__
>   tmp.addRawXml(s)
>  File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py", line
> 538, in addRawXml
>   self.children.append(SerializedXML(rawxmlstring))
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
> ordinal not in range(128)
>
> Does anyone understand why it doesn't work outside of Eclipse? My OS is
> Linux (Ubuntu 8.04).
>
> Thank you,
> Gabriel
>


It's an encoding problem. My guess is that, in eclipse, the default encoding
is UTF-8 or some other unicode-based encoding. In the console, it seems the
encoding defaults to ascii. When twisted attempts to turn your byte string
into a Unicode string, it sees a character that isn't in the encoding and
choke up. Try using a unicode string instead of a byte string.


>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at holdenweb.com  Wed Feb 18 09:15:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 09:15:25 -0500
Subject: Directory
In-Reply-To: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
Message-ID: <gnh565$5fd$1@ger.gmane.org>

gtillmon wrote:
> Hello.  I am new to the Python language.
> I would like to know how to display and store the path of each mondule
> that is called.

Modules are imported, not called.

> Similar to the old READY TRACE in COBOL of long ago.
> 
It's certainly possible to trace function calls, if that would help.
sys.settrace allows you to establish a function that gets called
whenever a Python function call is executed. The documentation is a
little sparse, but you can find a rough example under "Crude Python
Debugging" in

  http://www.st.ewi.tudelft.nl/~mol/snippets.php

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mike.barry at gmail.com  Wed Feb 18 09:23:43 2009
From: mike.barry at gmail.com (mbarry)
Date: Wed, 18 Feb 2009 06:23:43 -0800 (PST)
Subject: _socket.so source?
References: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
	<mailman.162.1234914454.11746.python-list@python.org>
Message-ID: <3060eb09-a255-419a-a1f1-5a42ffd803ec@h5g2000yqh.googlegroups.com>

On Feb 17, 6:47?pm, Christian Heimes <li... at cheimes.de> wrote:
> mbarry schrieb:
>
> > Hello,
>
> > The socket module in Python uses_socket.so for most of its behavior.
> > I want to modify the code that generates the_socket.so file.
> > I need the source file and instructions on how tocompileand build
> >_socket.so for Windows.
> > Can anyone point me to where I can find the source and/or
> > documentation for compiling a python shared object on Windows?
>
> You need the Python source tree (download the .tar.gz) and the correct
> compiler in order to build a .dll / .pyd file on Windows. For Python 2.4
> and 2.5 you need Visual Studio 2003 (VC7.1), for Python 2.6 and 3.0 you
> have to install Visual Studio 2008 (VC9).
>
> The code for the_socketextension is in the Modules/ subdirectory of
> the source tree.
>
> Christian

Thanks that was very helpful.  I was browsing the source tree and
found socketmodule.c which I assume is the source for _socket.pyd.  I
also found http://docs.python.org/extending/windows.html which is some
documentation for building python extensions in windows.  The _socket
module is a bit different as there seems to be code imported from the
dll as well as having code written in python in socket.py.  Also the
naming convention is different with the socket module as well.

Thanks
-Mike




Thanks
-Mike


From gabriel.rossetti at arimaz.com  Wed Feb 18 09:24:35 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Wed, 18 Feb 2009 15:24:35 +0100
Subject: Python/environment problem with char encoding/decoding
In-Reply-To: <gnh4vf$rp0$02$1@news.t-online.com>
References: <mailman.190.1234965056.11746.python-list@python.org>
	<gnh4vf$rp0$02$1@news.t-online.com>
Message-ID: <499C1A23.6060204@arimaz.com>

Peter Otten wrote:
> Gabriel Rossetti wrote:
>
>   
>> Hello everyone,
>>
>> I originally posted this on the Twisted mailing list, but now it seams
>> to be  a more general python/environment problem. If I run the attached
>> example in Eclipse, it works, if I run it from a terminal, it doesn't, I
>> get :
>>
>> $ python xml_parser_test.py
>> Traceback (most recent call last):
>>   File "xml_parser_test.py", line 30, in <module>
>>     res = rawXmlToElement("<t>re?u</t>")
>>   File "xml_parser_test.py", line 21, in __call__
>>     tmp.addRawXml(s)
>>   File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py",
>> line 538, in addRawXml
>>     self.children.append(SerializedXML(rawxmlstring))
>> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
>> ordinal not in range(128)
>>
>> Does anyone understand why it doesn't work outside of Eclipse? My OS is
>> Linux (Ubuntu 8.04).
>>     
>
> On the contrary, I don't understand why it would work in Eclipse ;)
>
> addRawXml(s) seems to be a fancy way to create a unicode string, and
> unicode(s) will work either if s is a bytestring that doesn't contain any
> non-ascii characters or if s is a unicode string (at least these are the
> relevant cases here).
>
> Try changing your program to use a unicode literal:
>
> # -*- coding: utf-8 -*-
> ...
> if ...
>     res = rawXmlToElement(u"<t>re?u</t>")
>
> Peter
> --
>
>   
Hello Peter, that works, thanks! I was sure I had tried that at some 
point, but I must have had another problem that made me remove it. Thank 
you again!
Gabriel


From steve at holdenweb.com  Wed Feb 18 09:27:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 09:27:25 -0500
Subject: Python-list Digest, Vol 65, Issue 365
In-Reply-To: <783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>
References: <mailman.747.1234948421.11745.python-list@python.org>
	<783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>
Message-ID: <gnh5sm$6e3$1@ger.gmane.org>

M Kumar wrote:
> 
> I think the given statement below will give you what you r looking
> <imported module name>.__file__print
> 
[followed by a whole Python list digest]

When replying to a question from a digest posting, PLEASE change the
subject line and only quote the relevant piece of the original posting.
Thank you.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From james at agentultra.com  Wed Feb 18 10:15:51 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 18 Feb 2009 07:15:51 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <878wo4verq.fsf@agentultra.com>
	<mailman.176.1234940532.11746.python-list@python.org>
Message-ID: <874oyrvkrc.fsf@agentultra.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Tue, 17 Feb 2009 21:12:57 -0200, J Kenneth King
> <james at agentultra.com>  escribi?:
>
>> I recently started a project called TracShell
>> (http://code.google.com/p/tracshell) where I make heavy use of the
>> xmlrpclib core module.
>>
>> When the number of RPC calls was small, wrapping each call in try/except
>> was acceptable. However, this obviously will duplicate code all over the
>> place. There are only ever two exceptions that the module itself will
>> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
>> but not show stoppers.
>>
>> To combat the duplication, my clever idea was to use a function
>> decorator to wrap any function that used xmlrpclib calls:
>>
>> def catch_errors(fn):
>>     """
>>     A decorator to catch typical xmlrpclib exceptions
>>     """
>>     def wrapped(*args, **kwargs):
>>         try:
>>             return fn(*args, **kwargs)
>>         except xmlrpclib.ProtocolError, e:
>>             print "There was a problem communicating with the server."
>>             print "URL: %s" % e.url
>>             print "Headers: %s" % e.headers
>>             print "Error code: %d" % e.errcode
>>             print "Error message: %s" % e.errmsg
>>             print "Please file a report with the TracShell developers."
>>             pass
>>         except xmlrpclib.Fault, e:
>>             print "A fault ocurred"
>>             print "Fault code: %d" % e.faultCode
>>             print "Fault string: %s" % e.faultString
>>             print "If you think this message is the result of an error,"
>>             print "please file a report with the TracShell developers."
>>             pass
>>     return wrapped
>
> I don't like the idea of "hiding" an exception. The caller code
> doesn't  know an exception occurred, and just continue doing its work,
> with bogus  results... is this what you want? Also, you don't include
> the stack trace  - and usually it contains very valuable
> information. When your users start  "filing a report with the
> TracShell developers" and you feel clueless, a  stack trace is
> important (you don't have to show it on screen - a log file  is even
> better).
>
> If all you want is to customize the error message, use sys.except_hook
>
> Looking into the code, those "pass" statement are useless; and error
> messages are usually written to stderr instead of stdout.

Thanks for the ideas.

I haven't actually used this pattern in any projects before, I was just
looking for a way to reduce the number of common try/except statements I
needed to have in my code; especially when they all looked exactly the
same and were catching every single xml-rpc call littered throughout my
class.

sys.except_hook looks more like what I was aiming for. I like Lisp's
"restarts," where I can define error condition handlers in one place
without having to litter my code with error handling statements.

Cheers.



From metallourlante at gmail.com  Wed Feb 18 10:16:10 2009
From: metallourlante at gmail.com (Alex)
Date: Wed, 18 Feb 2009 07:16:10 -0800 (PST)
Subject: Searching Google?
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
	<702dm1FkrikgU1@mid.dfncis.de>
Message-ID: <d8c59c85-14c3-4c5c-bc2d-3f84a625dc97@i38g2000yqd.googlegroups.com>

On Feb 18, 1:36?pm, Johannes Bauer <dfnsonfsdu... at gmx.de> wrote:
> Curt Hash schrieb:
>
> > You just need to change your User-Agent so that Google doesn't know a
> > Python script is making the request:
>
> Why would Google not send a response if the User-Agent header field is
> not a recognized browser?

Because making automated queries to Google is against its TOS so
Google block any client that doesn't seam to be human.
On the other hands Google's API does not return the same exact result
as in a normal web query.
My suggestion is: set a browser like User agent and accept gzipped
content to be as friendly as possible and don't do too many queries in
a small time span.
Parsing Google result page with Beautifulsoup is a piece of cake.

Alex


From bieffe62 at gmail.com  Wed Feb 18 10:19:20 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Wed, 18 Feb 2009 07:19:20 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
References: <mailman.83.1234835960.11746.python-list@python.org>
Message-ID: <6f45d1c5-abce-4be1-81de-be47163d81ed@h5g2000yqh.googlegroups.com>

On 17 Feb, 02:53, Mamahita Sela <mamahitas... at yahoo.com> wrote:
> Dear FB,
>
> > As you have been already told, join() blocks until the
> > thread is
> > terminated. and you should avoid that.
> > A simple fix could by add a timeout to t.join, doing
> > something like :
> > ? ? ? ? t.join(JOIN_TIMEOUT);
> > ? ? ? ? if not t.isAlive():
> > ? ? ? ? ? ? print t.result
>
> Thanks for your great sample. And, thank you for your tips on speedup the ping stuff.
>
> However, i still have problem when adding timeout to join().
> - It works, but only print out thread result that is not alive, as we put in the code. So, i never get result from unsuccessful ping action, which might take more time than timeout specified.
> - I still have little delay in GUI. Is it possible to make it smooth in GUI operation? When i put more timeout (say: 0.5 from 0.2), i will have to wait ?longer.
>
> PS: thanks for pointing out inefficient ping action :) I will follow the tips. But, another time I might need to do something else, like downloading files, or checking for serial devices. So, this thread thing, imho, is very important.
>
> Any help would be very appreciated.
> M.


You could make all_threads an attribute of main instance, and use it
to keep track of thread still alive. Therefore your
do_ping code shoulds be somethiong like this (NOT TESTED):

       for h in range(100, 105):
            host = '192.168.0.%d' %(h)
            #
            worker = PingHost(host)
            worker.start()
            self.all_threads.append(worker)
        #
        for t in self.all_threads:
           t.join(JOIN_TIMEOUT);
           if not t.isAlive():
                print t.result
                self.all_threads.remove(t)

        #
        return True


In this way, you could use a small value for JOIN_TIMEOUT and make the
GUI more responsive. The thread which are not
found completed when do_ping is called will stay in self.all_threads
and will be tested next time.
I did not check the documentation, but assumed that
gobject.timeout_add installs a _periodic_ timer. If it is not
so, you have to reinstall the timer at the end of do_ping, if
self.all_threads is not empty.
And don't forget to initialize self.all_threads in __init__ ;)

HTH

Ciao
-----
FB







From python at bdurham.com  Wed Feb 18 10:23:36 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 18 Feb 2009 10:23:36 -0500
Subject: Best practice for upgrading the version of SQLite bundled with 
	Python 2.6.1
In-Reply-To: <op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>
References: <1234926555.19179.1300986603@webmail.messagingengine.com>
	<op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1234970616.27485.1301081573@webmail.messagingengine.com>

Gabriel,

> At least on Windows, you only have to replace sqlite3.dll (in the DLLs directory) with the new one, and that's all.

That's easy! :)

Thank you,

Malcolm


From mad.vijay at gmail.com  Wed Feb 18 10:27:30 2009
From: mad.vijay at gmail.com (SamG)
Date: Wed, 18 Feb 2009 07:27:30 -0800 (PST)
Subject: Crypto headaches.
References: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
	<mailman.191.1234966245.11746.python-list@python.org>
Message-ID: <fcb780ee-f258-407a-b809-979e8cf120fc@l33g2000pri.googlegroups.com>

On Feb 18, 7:10 pm, "M.-A. Lemburg" <m... at egenix.com> wrote:
> On 2009-02-18 14:23, SamG wrote:
>
> > Hi,
>
> > Using the python's Crypto.Cipher.Blowfish is create and encrypted file
> > in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
> > error stating "bad magic number".
>
> Are you getting the error message from openssl ? It looks a lot
> like an error message from Python.
>
> > I tried
> > $ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
> > or
> > $ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file
>
> > BTW, decryption using a python code works well. But i m of the
> > impression a file encry with one program should/can be decrypt with
> > another program (in my case openssl) using the same parameters.
>
> Ideally, that should work, but you also have to make sure that
> the following two details are the same for both applications:
>
>  1. the way padding is done (Blowfish is a block cipher)
>
>  2. the way the initialization vector is set
>
> Otherwise the two won't interoperate properly.
>
> --
> Marc-Andre Lemburg
> eGenix.com
>
> Professional Python Services directly from the Source  (#1, Feb 18 2009)>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
> >>> mxODBC.Zope.Database.Adapter ...            http://zope.egenix.com/
> >>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
>
> ________________________________________________________________________
>
> ::: Try our new mxODBC.Connect Python Database Interface for free ! ::::
>
>    eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
>     D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
>            Registered at Amtsgericht Duesseldorf: HRB 46611
>                http://www.egenix.com/company/contact/

That must be it...

But given a password how do i generate a (key, IV) pair???

SamG


From oswald.harry at gmail.com  Wed Feb 18 11:29:34 2009
From: oswald.harry at gmail.com (harryos)
Date: Wed, 18 Feb 2009 08:29:34 -0800 (PST)
Subject: how to list all installed modules
Message-ID: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>

hi
Is there a way to list all the installed modules in my python
installation.I recently installed pygame and when i tried to import it
like
>>import pygame
it complained that no such module was found.I can see the pygame
directory in F:\Python25\Lib\site-packages in my machine,but am unable
to import the module.So I was wondering if there is a way to list all
the installed modules

any help much appreciated
thanks
harry


From __peter__ at web.de  Wed Feb 18 11:42:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 17:42:07 +0100
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
Message-ID: <gnhdor$vql$03$1@news.t-online.com>

harryos wrote:

> Is there a way to list all the installed modules in my python
> installation.I recently installed pygame and when i tried to import it
> like
>>>import pygame
> it complained that no such module was found.I can see the pygame
> directory in F:\Python25\Lib\site-packages in my machine,but am unable
> to import the module.So I was wondering if there is a way to list all
> the installed modules

>>> help("modules")

may help to get a list of modules (if it doesn't fail with an exception as
over here). 

Regarding the original problem, do you have multiple Python installations? 
If so, you may accidentally be running the "wrong" python.

Peter


From zamnedix at gmail.com  Wed Feb 18 11:45:16 2009
From: zamnedix at gmail.com (Zamnedix)
Date: Wed, 18 Feb 2009 08:45:16 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <a59e2f87-2878-4534-8e04-eb9eee2b27eb@l1g2000yqj.googlegroups.com>

On Feb 9, 12:58?pm, rantingrick <rantingr... at gmail.com> wrote:
> Hello all,
>
> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps. I now believe i am
> ready to start this endeavor and i am currently looking for fellow
> Python programmers (no matter what skill level) to get started
> brainstorming this design.
>
> I have a real good idea of the UI design and at this point i just want
> to start simple and build this thing. I figure this will be a good
> learning experience for myself and others and in the process i can
> realize my dream. And if all this turns out to be is a learning
> experience, well nobody lost.
>
> Of course Python will limit the speed here, but at this point i want
> to get a template up and running. Speed does not matter at this point,
> and optimizations can come along later as i am sure a few complete re-
> writes are inevitable :)
>
> My initial start will cover a very simple user interface something
> like VPython but much more usable as a CAD modeler. From the start
> just a few simple primitives (faces, lines-segments) that will be the
> building blocks for more complex models like (arcs, rectangles,
> circles, polygons, cubes, spheres, etc..).
>
> There will need to be mouse picking as i see this application as a
> very interactive environment. Of course in the beginning all
> interaction will most likely be in a command line type manner until
> the functionality can be worked out.
>
> There will need to be a hierarchy of instancing and grouping within
> the model to facilitate easy transformation of entities within the
> model.
>
> I am not too worried about any sort of texturing at this point. I want
> to squeeze as much speed as possible and prettiness will come in due
> course. I also have no plans for layering, or multiple scenes at this
> time. Simple functionality is the end game here.
>
> Once the UI is there and the modeling work flow is worked out,
> everything should be a component add-on from there.
>
> So the main points are...
>
> #-- Entities --#
> ?face
> ?line-segment
>
> #-- Hierarchy --#
> ?Entity (one face, or line-segment)
> ?Group (contained of multiple entities that can be translated,
> rotated, scaled as one)
> ?Instance (component definition)
>
> #-- Tools --#
> ?line
> ?rect
> ?circle
> ?arc
> ?select
> ?rotation
> ?translation
> ?scale
> ?extrusion along path
> ?measurement
>
> So there it is. Any takers? :)

I realize this isn't necessarily CAD, but...
http://www.blender.org/


From oswald.harry at gmail.com  Wed Feb 18 12:08:14 2009
From: oswald.harry at gmail.com (harryos)
Date: Wed, 18 Feb 2009 09:08:14 -0800 (PST)
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
	<gnhdor$vql$03$1@news.t-online.com>
Message-ID: <48383a90-80a0-4c2f-a79c-47c9c480581c@g3g2000pre.googlegroups.com>

On Feb 18, 9:42?pm, Peter Otten <__pete... at web.de> wrote:
> >>> help("modules")

thanks Peter.That helped.
> Regarding the original problem, do you have multiple Python installations?
> If so, you may accidentally be running the "wrong" python.

I have only one installation.It shows all other modules.I will try
reinstalling .
regards,
harry



From sam at 2000soft.com  Wed Feb 18 12:08:41 2009
From: sam at 2000soft.com (Sam Clark)
Date: Wed, 18 Feb 2009 09:08:41 -0800
Subject: Revision Control
Message-ID: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>

Any suggestions for a beginer on what to use for version control?   It's just me, the lone person programming.  I've already nailed one "version" of my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus I really don't like MS much...  Any free open source stuff out there?
 
Thank you,
 
Sam Clark
sam at 2000soft.com
 
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From clp2 at rebertia.com  Wed Feb 18 12:12:03 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 09:12:03 -0800
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>

On Wed, Feb 18, 2009 at 9:08 AM, Sam Clark <sam at 2000soft.com> wrote:
> Any suggestions for a beginer on what to use for version control?   It's
> just me, the lone person programming.  I've already nailed one "version" of
> my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus
> I really don't like MS much...  Any free open source stuff out there?

I like Mercurial (hg) personally: http://www.selenic.com/mercurial/wiki/
It's written in Python, works well on Windows, is a modern distributed
VCS, and is simpler than Git.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From zaheer.agadi at gmail.com  Wed Feb 18 12:13:17 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Wed, 18 Feb 2009 09:13:17 -0800 (PST)
Subject: why do I get name not defined error
Message-ID: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>

Hi,

 I have the following declared in my class, I am trying tp call a
method defined in the same class
I am not sure why I am getting name not defined error

    if options.uploadFile != None :
        print "This is path", the_rest
        filePath = the_rest
        UploadFile(None,filePath)

def UploadFile(self,path):
    print "I wil upload now"
    os.chdir(homeFolder)
    config = ConfigParser.ConfigParser()
    .....

any ideas why the error name UploadFile not defined

Thnaks




From deets at nospam.web.de  Wed Feb 18 12:17:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 18 Feb 2009 18:17:00 +0100
Subject: why do I get name not defined error
In-Reply-To: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
References: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
Message-ID: <702u4dFmcsarU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com schrieb:
> Hi,
> 
>  I have the following declared in my class, I am trying tp call a
> method defined in the same class
> I am not sure why I am getting name not defined error
> 
>     if options.uploadFile != None :
>         print "This is path", the_rest
>         filePath = the_rest
>         UploadFile(None,filePath)
> 
> def UploadFile(self,path):
>     print "I wil upload now"
>     os.chdir(homeFolder)
>     config = ConfigParser.ConfigParser()
>     .....
> 
> any ideas why the error name UploadFile not defined
> 

Because you need to define things *before* you use them the first time. 
This is not to be confused with forward-declarations, as they are needed 
in C for example - in python you can do


def foo():
    bar()

def bar():
    foo()


(resulting in an endless loop of course)

But you can't do


def foo():
    bar()

foo() # this will fail

def bar():
    foo()



Diez


From __peter__ at web.de  Wed Feb 18 12:22:36 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 18:22:36 +0100
Subject: why do I get name not defined error
References: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
Message-ID: <gnhg4o$67f$00$1@news.t-online.com>

zaheer.agadi at gmail.com wrote:

>  I have the following declared in my class, I am trying tp call a
> method defined in the same class
> I am not sure why I am getting name not defined error
 
Assuming this is part of a method

def method(self):
>     if options.uploadFile != None :
>         print "This is path", the_rest
>         filePath = the_rest
>         UploadFile(None,filePath)

you have to change the above line to

          self.UploadFile(filePath)
 

Now consider reading a tutorial before you proceed.

Peter


From benjamin.kaplan at case.edu  Wed Feb 18 12:39:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 18 Feb 2009 12:39:53 -0500
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>

On Wed, Feb 18, 2009 at 12:08 PM, Sam Clark <sam at 2000soft.com> wrote:

>  Any suggestions for a beginer on what to use for version control?   It's
> just me, the lone person programming.  I've already nailed one "version" of
> my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus
> I really don't like MS much...  Any free open source stuff out there?
>

There's actually a lot of them. These are just the ones I can think of off
the top of my head.
-CVS (One of the first RCS, I think most projects are moving away from this
one.)
- Subversion-(pretty popular right now, but it is a client/server model.)
-Git (originally created for Linux and now used by several very large
projects)
-Mercurial (this is a big up and coming RCS)
-Bazaar (written in Python. Also pretty new. I don't know about Windows
support)

I have some experience with both Subversion and Mercurial and like them
both. Since you're working alone, you'll probably want a distributed rcs,
such as Mercurial, Git, and Bazaar, which allow you to do more stuff locally
rather than on a central server. Like Chris, I'd suggest Mercurial
especially if you're using Windows.


Thank you,
>
> Sam Clark
> sam at 2000soft.com
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From Scott.Daniels at Acm.Org  Wed Feb 18 13:10:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 10:10:53 -0800
Subject: how to list all installed modules
In-Reply-To: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
Message-ID: <4-6dndjITMU90wHUnZ2dnUVZ_qvinZ2d@pdx.net>

harryos wrote:
> Is there a way to list all the installed modules in my python
> installation.I recently installed pygame and when i tried to import it
> like
>>> import pygame
> it complained that no such module was found.I can see the pygame
> directory in F:\Python25\Lib\site-packages in my machine,but am unable
> to import the module.So I was wondering if there is a way to list all
> the installed modules

Are you running F:\Python25\python.exe (or F:\Python25\pythonw.exe)?
open a command window (run cmd), and type:
     C:\> python
     ...
     >>> import sys
     >>> for dirname in  sys.path:
             print sys.path

I suspect something you see printed will surprise you.
Either the banner, identifying a Python version you were
not expecting, or perhaps a bunch of C:-based directories.
If this does not help you decipher the problem, try running
      python -v
Python verbose mode (You will get a _lot_ of output).
Then, when you (finally) get a ">>>" prompt, type:
    >>> import pygame
and you will see eaxctly what lookups are tried.

--Scott David Daniels
Scott.Daniels at Acm.Org


From thomasmallen at gmail.com  Wed Feb 18 13:17:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Wed, 18 Feb 2009 10:17:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
Message-ID: <788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com>

On Feb 18, 4:51?am, alex23 <wuwe... at gmail.com> wrote:
> On Feb 18, 7:34?pm, rdmur... at bitdance.com wrote:
>
> > Yeah, but wget -r -k will do that bit of it, too.
>
> Wow, nice, I don't know why I never noticed that. Cheers!

Hm...doesn't do that over here. I thought it may have been because of
absolute links (not to site root), but it even leaves things like <a
href="/">. Does it work for you guys?


From skip at pobox.com  Wed Feb 18 13:34:09 2009
From: skip at pobox.com (skip at pobox.com)
Date: Wed, 18 Feb 2009 12:34:09 -0600
Subject: Revision Control
In-Reply-To: <50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>
Message-ID: <18844.21665.189434.503197@montanaro.dyndns.org>


    >> Any suggestions for a beginer on what to use for version control?

    Chris> I like Mercurial (hg) personally...

Me too.  It's perfect for little one-person things.  (It's probably good for
other stuff as well, but I certainly like how easy it is to use for
standalone stuff.)

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From python.list at tim.thechases.com  Wed Feb 18 13:36:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 18 Feb 2009 12:36:17 -0600
Subject: Revision Control
In-Reply-To: <ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
Message-ID: <499C5521.2040705@tim.thechases.com>

> -CVS (One of the first RCS, I think most projects are moving away from this
> one.)

I wouldn't suggest starting a new project with CVS.  Subversion 
(svn) resolves several of the main issues with it, so using SVN 
instead wins over CVS in just about every possible way.

> - Subversion-(pretty popular right now, but it is a client/server model.)

A good solid & popular choice, but the merging capabilities are a 
bit weak (the latest version just added some better capabilities 
for branching/merging, but it's a bit of a hack).  It's also not 
the most efficient storage -- git and mercurial (hg) both have 
very efficient repository structures compared to SVN.  The family 
DVCS tools (git, mercurial, bzr, darcs) are stronger in this 
area.  My employer uses SVN for their primary repository. 
Documentation is outstandingly good (documentation for the others 
is also good, but SVN's is exceptional).

> -Git (originally created for Linux and now used by several very large
> projects)

I've tried several times to like git -- some folks swear by it. 
The Win32 support has been a bit wanting, but growing.  I find it 
a bit more complex but it's certainly not lacking for power. 
I'll continue to try it occasionally to see if it meets my needs 
better than Mercurial

> -Mercurial (this is a big up and coming RCS)

This is currently my favorite:  good branching/merging, fast, 
written mostly in Python (one C extension module, IIRC), and a 
simple interface

> -Bazaar (written in Python. Also pretty new. I don't know about Windows
> support)

I like Bazaar (bzr), but the last several times I've tried it, 
it's been a little slow.  This has been steadily improving, and I 
like their emphasis on correctness foremost.  It's a lot like 
mercurial, but is pure python (no C extension module) which makes 
it nice to deploy into environments such as my shared web-hosting 
service where I can't build extension C modules or install 
packages such as hg/git/svn from the repository.

All of them have GUI interfaces if you need, but I tend to just 
use them from the command-line.  For most of them, you can get by 
with a handful of commands without needing to learn every last 
corner.

For what you (the OP) describe, I'd suggest SVN, Mercurial, or 
Bazaar as they're a little easier to wrap your head around -- SVN 
wins for documentation, Mercurial wins for speed and merging, and 
Bazaar wins for portability and merging.  Git would win for sheer 
power, but if you're just beginning, I'd skip it for now.

-tkc










From lionel.keene at gmail.com  Wed Feb 18 13:48:56 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 10:48:56 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com>
Message-ID: <a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com>

On Feb 18, 12:56?am, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 17, 3:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hello all,
>
> > On a previous thread (http://groups.google.com/group/comp.lang.python/
> > browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> > hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> > binary data. Briefly, my data consists of complex numbers, 32-bit
> > floats for real and imaginary parts. The data is stored as 4 bytes
> > Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> > row-major format. I needed to read the data in as two separate numpy
> > arrays, one for real values and one for imaginary values.
>
> > There were several very helpful performance tips offered, and one in
> > particular I've started looking into. The author suggested a
> > "numpy.memmap" object may be beneficial. It was suggested I use it as
> > follows:
>
> > descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> > data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> > print "First 100 real values:", data.r[:100]
>
> > I have two questions:
> > 1) What is "recarray"?
>
> Let's look:
>
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import numpy
> >>> numpy.recarray
>
> <class 'numpy.core.records.recarray'>
>
> >>> help(numpy.recarray)
>
> Help on class recarray in module numpy.core.records:
>
> class recarray(numpy.ndarray)
> ?| ?recarray(shape, dtype=None, buf=None, **kwds)
> ?|
> ?| ?Subclass of ndarray that allows field access using attribute
> lookup.
> ?|
> ?| ?Parameters
> ?| ?----------
> ?| ?shape : tuple
> ?| ? ? ?shape of record array
> ?| ?dtype : data-type or None
> ?| ? ? ?The desired data-type. ?If this is None, then the data-type is
> determine
> ?| ? ? ?by the *formats*, *names*, *titles*, *aligned*, and
> *byteorder* keywords
> ?| ?buf : [buffer] or None
> ?| ? ? ?If this is None, then a new array is created of the given
> shape and data
> ?| ? ? ?If this is an object exposing the buffer interface, then the
> array will
> ?| ? ? ?use the memory from an existing buffer. ?In this case, the
> *offset* and
> ?| ? ? ?*strides* keywords can also be used.
> ...
>
> So there you have it. ?It's a subclass of ndarray that allows field
> access using attribute lookup. ?(IOW, you're creating a view of the
> memmap'ed data of type recarray, which is the type numpy uses to
> access structures by name. ?You need to create the view because
> regular numpy arrays, which numpy.memmap creates, can't access fields
> by attribute.)
>
> help() is a nice thing to use, and numpy is one of the better
> libraries when it comes to docstrings, so learn to use it.
>
> > 2) The documentation for numpy.memmap claims that it is meant to be
> > used in situations where it is beneficial to load only segments of a
> > file into memory, not the whole thing. This is definately something
> > I'd like to be able to do as my files are frequently >1Gb. I don't
> > really see in the diocumentation how portions are loaded, however.
> > They seem to create small arrays and then assign the entire array
> > (i.e. file) to the memmap object. Let's assume I have a binary data
> > file of complex numbers in the format described above, and let's
> > assume that the size of the complex data array (that is, the entire
> > file) is 100x100 (rows x columns). Could someone please post a few
> > lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> > right 50 x 50 quadrant into memmap objects? Thank you very much in
> > advance!
>
> You would memmap the whole region in question (in this case the whole
> file), then take a slice. ?Actually you could get away with memmapping
> just the last 50 rows (bottom half). ?The offset into the file would
> be 50*100*8, so:
>
> data = memmap(filename, dtype=descriptor, mode='r',offset=
> (50*100*8)).view(recarray)
> reshaped_data = reshape(data,(50,100))
> intersting_data = reshaped_data[:,50:100]
>
> A word of caution: Every instance of numpy.memmap creates its own mmap
> of the whole file (even if it only creates an array from part of the
> file). ?The implications of this are A) you can't use numpy.memmap's
> offset parameter to get around file size limitations, and B) you
> shouldn't create many numpy.memmaps of the same file. ?To work around
> B, you should create a single memmap, and dole out views and slices.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

Thanks Carl, I like your solution. Am I correct in my understanding
that memory is allocated at the slicing step in your example i.e. when
"reshaped_data" is sliced using "interesting_data = reshaped_data[:,
50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
is constructed that memmaps the entire file. Some relatively small
amount of memory is allocated for the memmap operation, but the bulk
memory allocation occurs when I generate my final numpy sub-array by
slicing, and this accounts for the memory efficiency of using memmap?


From johnson at pharmacy.arizona.edu  Wed Feb 18 14:28:15 2009
From: johnson at pharmacy.arizona.edu (bleah)
Date: Wed, 18 Feb 2009 11:28:15 -0800 (PST)
Subject: PIL install driving me mad! With solution!
Message-ID: <c24de59f-bd92-4dcb-bcbe-6563eabea96c@x29g2000prf.googlegroups.com>

I'm trying to get PIL 1.16 installed on a SUSE SLES10 system, and
cannot, for the life of me, get the thing to compile with jpeg
support.

The libjpeg-devel libraries are installed, and are present in /usr/lib
JUST WHERE SPECIFIED in the setup.py file, and the jpeglib.h incliude
file is present  JUST WHERE SPECIFIED in the setup.py file.

The build process proceeds without errors, yet selftest.py fails with
the error:

tonic:~/html2pdf_sources/Imaging-1.1.6 # python selftest.py
*****************************************************************
Failure in example: _info(Image.open("Images/lena.jpg"))
from line #24 of selftest.testimage
Exception raised:
Traceback (most recent call last):
  File "./doctest.py", line 499, in _run_examples_inner
    exec compile(source, "<string>", "single") in globs
  File "<string>", line 1, in <module>
  File "./selftest.py", line 22, in _info
    im.load()
  File "PIL/ImageFile.py", line 180, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available
1 items had failures:
   1 of  57 in selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.


Again and again and again.


I found this post  http://blog.tlensing.org/2008/12/04/kill-pil-?-the-python-imaging-library-headache
which provided the solution.

When you run selftest.py in the Imaging-1.1.6 directory, python finds
the PIL.pth and PIL file and directory, respectively and uses those
instead of the properly compiled versions in the python directories.

So PIL is installed, it IS working perfectly, it's selftest.py that's
failing...


From lionel.keene at gmail.com  Wed Feb 18 14:43:09 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 11:43:09 -0800 (PST)
Subject: PyGTK install
Message-ID: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>

Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
post here and hope someone new the answer. I feel it's a silly
problem, maybe something to do with a path variable? The problem: I've
downloaded the "all-in-one" windows binary installer for PyGTK from
their website. After typing in their first tutorial program and trying
to run from the command line, I get:

"This application has failed to start because libglib-2.0-0.dll was
not found" error dialog.

The traceback indicates this is happening at the "import gtk" line. A
quick search of my install directory for PyGTK indicates that the file
is indeed resident and located in C:\Program files\PyGTK\GTK\bin.

Is there some some sort of path variable for Python I need to modify
and, if so, how is this done? Thanks so much, and my apologies if this
is the wrong forum.

-L


From jervisau at gmail.com  Wed Feb 18 14:44:02 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 19 Feb 2009 06:44:02 +1100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
Message-ID: <8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>

>
> What happens when you have hundreds of megabytes, I don't know.
>
>
I hope I never have to test a word that is hundreds of megabytes long
for a vowel :)


From steve at holdenweb.com  Wed Feb 18 15:05:47 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 15:05:47 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
Message-ID: <gnhpn4$n6a$1@ger.gmane.org>

Jervis Whitley wrote:
>> What happens when you have hundreds of megabytes, I don't know.
>>
>>
> I hope I never have to test a word that is hundreds of megabytes long
> for a vowel :)

I see you don't speak German ;-)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From __peter__ at web.de  Wed Feb 18 15:12:45 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 21:12:45 +0100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
Message-ID: <gnhq3n$r2b$00$1@news.t-online.com>

Steven D'Aprano wrote:

> On Wed, 18 Feb 2009 07:08:04 +1100, Jervis Whitley wrote:
> 
> 
>>> This moves the for-loop out of slow Python into fast C and should be
>>> much, much faster for very large input.
>>>
>>>
>> _Should_ be faster.
> 
> Yes, Python's timing results are often unintuitive.

Indeed.

> It seems to me that I was mistaken -- for large enough input, the running
> time of each version converges to approximately the same speed.

No, you were right. Both any_test() and for_test() use the improvement you 
suggested, i. e. loop over the vowels, not the characters of the word.
Here's the benchmark as it should have been:

$ python -m timeit -s'word = "g"*10000' 'any(v in word for v in "aeiouAEIOU")'
1000 loops, best of 3: 314 usec per loop
$ python -m timeit -s'word = "g"*10000' 'any(c in "aeiouAEIOU" for c in word)'
100 loops, best of 3: 3.48 msec per loop

Of course this shows only the worst case behaviour. The results will vary 
depending on the actual word e. g. "Ug..." or "g...a".

Peter 



From eliben at gmail.com  Wed Feb 18 15:18:27 2009
From: eliben at gmail.com (eliben)
Date: Wed, 18 Feb 2009 12:18:27 -0800 (PST)
Subject: number theory libraries / project euler
Message-ID: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>

Hello,

What are some good & recommended number theory libs for Python (or
accessible interfaces to C libs), for things like primes,
factorization, etc. Naturally, speed is of utmost importance here.

In other words, which Python libraries and tools to you use to help
you solve Project Euler problems :-) ?

Eli


From __peter__ at web.de  Wed Feb 18 15:22:45 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 21:22:45 +0100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
	<mailman.203.1234987578.11746.python-list@python.org>
Message-ID: <gnhqmf$r2b$00$2@news.t-online.com>

Steve Holden wrote:

> Jervis Whitley wrote:
>>> What happens when you have hundreds of megabytes, I don't know.
>>>
>>>
>> I hope I never have to test a word that is hundreds of megabytes long
>> for a vowel :)
> 
> I see you don't speak German ;-)

I tried to come up with a funny way to point out that you're a fool.

But because I'm German I failed.

Peter


From josh.dukes at microvu.com  Wed Feb 18 15:27:04 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Wed, 18 Feb 2009 12:27:04 -0800
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
Message-ID: <20090218122704.30bfda77@microvu.com>

You might also want to look in to open cascade. It supports a bunch of
standard 3d model formats (stl, iges, step) and has python bindings.
Salome is based on open cascade. http://www.pythonocc.org/ However, I'm
not entirely clear on the license for this so that might be an issue. I
know the Debian lawyers had some problems with Salome because it
compiled against open cascade. I believe if you made open cascade an
optional run-time dependency it could still be a valid gpl app.

It's also important to keep in mind that what most people think of as
cad/cam is really multiple things that can be broken up into modules
(cad/cam/fea). Those can also be broken up into modules (fea can be
broken into meshing, pre-processing, analysis, and post-processing). It
seems like attacking things this way might be best. If you're really
serious about this (there are lots of failed Linux cad packages) I'd
suggest setting up a project on sourceforge and get a mailing list.
Post a link to the mailing list and I'll join. I can probably find some
other mailing lists that you should try to recruit from, but having a
sourceforge page and a mailing list really helps your legitimacy. 

Another interesting project is FreeCAD, which is written in C++ but
compiled against python,
http://juergen-riegel.net/FreeCAD/Docu/index.php?title=Main_Page might
be worth looking at. 

I look forward to joining your mailing list. 

On Wed, 18 Feb 2009 01:02:22 -0800 (PST)
r <rt8396 at gmail.com> wrote:

> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.
> 
> So, yes, i have looked at both the applications you offer.
> 
> Thanks
> --
> http://mail.python.org/mailman/listinfo/python-list


-- 

Josh Dukes
MicroVu IT Department


From kwmsmith at gmail.com  Wed Feb 18 15:31:55 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Wed, 18 Feb 2009 14:31:55 -0600
Subject: number theory libraries / project euler
In-Reply-To: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <c266a7930902181231y6e5098c2q139a0129659a0eb4@mail.gmail.com>

On Wed, Feb 18, 2009 at 2:18 PM, eliben <eliben at gmail.com> wrote:
>
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.
>
> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?

There's Sage: http://www.sagemath.org/ -- I believe it aims to do
everything that Mathematica can do and more, and I know it has some
number theory libs, too.  I haven't had the occasion to use it myself.

Much of the fun of project euler problems is 'rolling your own,' or
implementing a classic algorithm from a description of it on
Wikipedia.  A good sieve of eratosthenes in pure Python (that I tend
to use quite often) is here:

http://code.activestate.com/recipes/117119/

You can find some combinatorics in numpy, I believe.

Often the solutions are one-to-five liners, if you've thought the
problem through.  Too much dependence on external libraries robs the
project euler problems of their fun, IMO.

Best,

Kurt


From andrew at acooke.org  Wed Feb 18 15:32:12 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 18 Feb 2009 17:32:12 -0300 (CLST)
Subject: number theory libraries / project euler
In-Reply-To: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <1b7a4f36961f874388857ae7e8f2a3cc.squirrel@localhost>

eliben wrote:
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.

i just read the project site and one of the things they say on their front
page is that all problems have a solution that should run in "under a
minute".  the emphasis is on finding the right algorithm, not brute force
number crunching.  so i am not sure that speed is of much importance at
all.

> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?

you may want to look at numpy and scipy, but looking at the first dozen
questions i think ordinary python may be sufficient.

andrew




From pavlovevidence at gmail.com  Wed Feb 18 15:35:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 12:35:55 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com>
Message-ID: <66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com>

On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
> Thanks Carl, I like your solution. Am I correct in my understanding
> that memory is allocated at the slicing step in your example i.e. when
> "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> is constructed that memmaps the entire file. Some relatively small
> amount of memory is allocated for the memmap operation, but the bulk
> memory allocation occurs when I generate my final numpy sub-array by
> slicing, and this accounts for the memory efficiency of using memmap?

No, what accounts for the memory efficienty is there is no bulk
allocation at all.  The ndarray you have points to the memory that's
in the mmap.  There is no copying data or separate array allocation.

Also, it's not any more memory efficient to use the offset parameter
with numpy.memmap than it is to memmap the whole file and take a
slice.


Carl Banks


From cs at zip.com.au  Wed Feb 18 16:33:50 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 19 Feb 2009 08:33:50 +1100
Subject: Musings: Using decorators to reduce duplicate exception handling
In-Reply-To: <878wo4verq.fsf@agentultra.com>
Message-ID: <20090218213350.GA23549@cskk.homeip.net>

On 17Feb2009 15:12, J Kenneth King <james at agentultra.com> wrote:
| I recently started a project called TracShell
| (http://code.google.com/p/tracshell) where I make heavy use of the
| xmlrpclib core module.
| 
| When the number of RPC calls was small, wrapping each call in try/except
| was acceptable. [...]
| To combat the duplication, my clever idea was to use a function
| decorator to wrap any function that used xmlrpclib calls:
| def catch_errors(fn):
[...]
| Maybe I could rename the decorator to something meaningful, but besides
| that it works pretty well. Now any function I write in my class that
| uses RPC calls can be wrapped by this decorator and have the exception
| handling done in a uniform way for these particular exceptions.

My Python fu is still weak, but I had a similar issue last year and
wrote a context manager, used thus:

  with NoExceptions(handler):
      ... do stuff that may break ...

The constructor takes a handleException argument (which may be None, but it
has to be explicit) to tune which exceptions are caught; default is
everything. This was for a daemon thread that did RPC calls, so it was
actually fairly important to never die; normally you'd want to catch only
specific exceptions.

Code:

  class NoExceptions(object):
      ''' A context manager to catch _all_ exceptions and log them.
          Arguably this should be a bare try...except but that's syntacticly
          noisy and separates the catch from the top.
      '''

      def __init__(self, handleException):
          ''' Initialise the NoExceptions context manager.
              The handleException is a callable which
              expects (exc_type, exc_value, traceback)
              and returns True or False for the __exit__
              method of the manager.
              If handleException is None, the __exit__ method
              always returns True, suppressing any exception.
          '''
          self.__handler = handleException

      def __enter__(self):
          pass

      def __exit__(self, exc_type, exc_value, traceback):
          if self.__handler is not None:
              return self.__handler(exc_type, exc_value, traceback)
          if exc_type is not None:
              print >>sys.stderr, "ignore %s" % (exc_type,)
          return True

It doesn't actually solve your duplication issue and is a bit of a niche
application, but it's a lot shorter than an inline try/except and to my eye
reads a little better, and it keeps the exception handling up front at the
calling end where it is visible.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 16:39:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 19:39:24 -0200
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<gnh565$5fd$1@ger.gmane.org>
Message-ID: <op.upkg3y2ix6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 12:15:25 -0200, Steve Holden <steve at holdenweb.com>  
escribi?:
> gtillmon wrote:

>> I would like to know how to display and store the path of each mondule
>> that is called.
> It's certainly possible to trace function calls, if that would help.
> sys.settrace allows you to establish a function that gets called

If the OP is only interested in import statements, perhaps the -v flag is  
enough:

python -v script_name.py

It prints a line (on stderr) for each module imported, stating its name  
and source file.

-- 
Gabriel Genellina



From rgoldman23 at gmail.com  Wed Feb 18 16:42:05 2009
From: rgoldman23 at gmail.com (Rudi Goldman)
Date: Wed, 18 Feb 2009 13:42:05 -0800
Subject: Delete lines which contain string in a file
Message-ID: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>

Hi,
Go easy on me as I am a new to Python and am trying to solve a practical
problem that is driving me bananas.
Basically I have 2 text files, a source and a target. I want to be able to
delete all of the lines in the target file which contain text from any line
in the source file.
i.e.
Source:                                     Target:
111                                           xxx 111 yyy
222                                           xxx  333 sss
333                                           jjj   444 sss

After executing this code the target file should only consist of the line:
  jjj   444 sss
Any help on this one would be greatly appreciated.

Thanks,
Rudi
-------------- next part --------------
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From castironpi at gmail.com  Wed Feb 18 16:43:45 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 18 Feb 2009 13:43:45 -0800 (PST)
Subject: PyTypeObject subclass
Message-ID: <f525a751-4ffb-49a2-829a-1c1290c3c097@u18g2000pro.googlegroups.com>

Hi,

Is it ok to subclass PyTypeObject, so that my custom 'tp_' fields can
appear at the bottom of it?  Is there anything like size requirements
going on in its code?  Or is it better to use 'tp_dict' or slots?

Thanks.



From tim.wintle at teamrubber.com  Wed Feb 18 16:46:24 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 21:46:24 +0000
Subject: Searching Google?
In-Reply-To: <702dm1FkrikgU1@mid.dfncis.de>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
	<702dm1FkrikgU1@mid.dfncis.de>
Message-ID: <1234993584.7867.22.camel@tim-laptop>

On Wed, 2009-02-18 at 13:36 +0100, Johannes Bauer wrote:
> Curt Hash schrieb:
> 
> > You just need to change your User-Agent so that Google doesn't know a
> > Python script is making the request:
> 
> Why would Google not send a response if the User-Agent header field is
> not a recognized browser? I doubt that's what's happening and the OP
> would just like the convenience of a search API instead of parsing the
> web page (like other applications do). Ugly, but it works.

I suspect that it's the other way around - Google has black-listed the
standard python user-agent rather than whitelisting useragents.

Think about how much power it takes to do a query on Google - if they
provided a search API they would lose out on advertising on the results
- which at the end of the day is their income-source.

It's a pain not to have a search API, but you've got to understand it!




From SiteContactUs at gmail.com  Wed Feb 18 16:49:36 2009
From: SiteContactUs at gmail.com (beetlecube)
Date: Wed, 18 Feb 2009 13:49:36 -0800 (PST)
Subject: Can't get the IPYthon ipapi object working
Message-ID: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>

Hi , I found out from a random google search that I could use IPython
to automatically import modules so that I could test Django views.

I downloaded it (WIN XP), installed it.  I'm able to import it, but I
just can't seem to get the object working.

The code:
-----------------------------------
try:
    import IPython.ipapi
    ip = IPython.ipapi.get()
    a = ip.options
    ip.ex('import os')

except Exception,msg:
    print "Message: ", msg
-------------------------------------------

I get: ' Message:  'NoneType' object has no attribute 'options' '

If I remove the ip.options statement, it will say the same thing about
attribute 'ex'

Does anyone know if there are configuration options necessary?

 I read the docs, and it described a profile module, but I just need
to run this, for this single purpose ( at least, now, later I can see
its usefulness definitely,)

Steve













From lionel.keene at gmail.com  Wed Feb 18 17:08:53 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 14:08:53 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
Message-ID: <5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com>

On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
> Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> post here and hope someone new the answer. I feel it's a silly
> problem, maybe something to do with a path variable? The problem: I've
> downloaded the "all-in-one" windows binary installer for PyGTK from
> their website. After typing in their first tutorial program and trying
> to run from the command line, I get:
>
> "This application has failed to start because libglib-2.0-0.dll was
> not found" error dialog.
>
> The traceback indicates this is happening at the "import gtk" line. A
> quick search of my install directory for PyGTK indicates that the file
> is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> Is there some some sort of path variable for Python I need to modify
> and, if so, how is this done? Thanks so much, and my apologies if this
> is the wrong forum.
>
> -L

Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
different traceback error:

"ImportError: no module named pygtk"

I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
Then I displaye the sys.path:

IDLE 1.2
>>> import sys
>>> sys.path
['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
\PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
\DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
\PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
\lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
\\Python\\lib\\site-packages']

Every single entry is related to PyGTK and nothing else. Something
seems wrong here but I don't have enough Python experience to know
just what. Anyone?


From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:16:41 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:16:41 -0000
Subject: Newbie Q about Turtle Gfx
Message-ID: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>

Hello

Sorry if this is not an appropriate newsgroup for this problem. I am very 
new to Python but not new to programming.

I am hoping to use Python to teach a class and have been looking at the 
online book 'Snake Wrangling for Kids'.

I have followed the example

>>>import turtle
>>>t=turtle.pen()

which works fine and displays a turtle in a window.

However whenever I try to use something like

>>>t.forward(50)   (taken from the book)

i get the error...

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    t.forward(50)
AttributeError: 'dict' object has no attribute 'forward'

I get the same error with t.left(10) etc. etc.

I have tried this with V2.6 and V3

Any ideas would be much appreciated.

Thanks
Neil





From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:18:04 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:18:04 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>

Forgot to say, that after the error message the turtle window 'hangs' as 
unresponsive ...

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very 
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the 
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
>>>>import turtle
>>>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
>>>>t.forward(50)   (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
>  File "<pyshell#3>", line 1, in <module>
>    t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil
>
>
> 




From shandy.b at gmail.com  Wed Feb 18 17:20:57 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 18 Feb 2009 14:20:57 -0800 (PST)
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <9ba48cb7-d32b-40ef-a6a6-d2250886379a@l33g2000pri.googlegroups.com>

It looks like there may be a bug if you were expecting t to be some
object other than a dict.  You can apparently contact the authour
here:

http://www.briggs.net.nz/log/contact/

On Feb 18, 2:16?pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) ? (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil



From tim.wintle at teamrubber.com  Wed Feb 18 17:21:50 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 22:21:50 +0000
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <1234995710.7867.61.camel@tim-laptop>

On Wed, 2009-02-18 at 09:08 -0800, Sam Clark wrote:
> Any suggestions for a beginer on what to use for version control?
> It's just me, the lone person programming.  I've already nailed one
> "version" of my code accidentaly.  MS VSS is too expensive for the
> stuff I'm doing, plus I really don't like MS much...  Any free open
> source stuff out there?

I use svn (subversion) at work and it works fine, but I'm using bazaar
<http://bazaar-vcs.org/> on my own code, and even alongside svn to help
with merging branches, porting code up-stream etc.

bazaar is really great in my experience, although relatively new so you
might prefer to stick to svn. I haven't tried using bazaar on windows.


If you do go with svn, try the latest version, since merging support is
much better in this.


Tim




From gtill60 at gmail.com  Wed Feb 18 17:22:59 2009
From: gtill60 at gmail.com (gtillmon)
Date: Wed, 18 Feb 2009 14:22:59 -0800 (PST)
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<gnh565$5fd$1@ger.gmane.org>
	<mailman.208.1234993181.11746.python-list@python.org>
Message-ID: <7d253b32-0a76-4a74-b524-6807322756e7@j35g2000yqh.googlegroups.com>

On Feb 18, 3:39?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 18 Feb 2009 12:15:25 -0200, Steve Holden <st... at holdenweb.com> ?
> escribi?:
>
> > gtillmon wrote:
> >> I would like to know how to display and store the path of each mondule
> >> that is called.
> > It's certainly possible to trace function calls, if that would help.
> > sys.settrace allows you to establish a function that gets called
>
> If the OP is only interested in import statements, perhaps the -v flag is ?
> enough:
>
> python -v script_name.py
>
> It prints a line (on stderr) for each module imported, stating its name ?
> and source file.
>
> --
> Gabriel Genellina

Thanks for the information.


From gtill60 at gmail.com  Wed Feb 18 17:23:15 2009
From: gtill60 at gmail.com (gtillmon)
Date: Wed, 18 Feb 2009 14:23:15 -0800 (PST)
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<mailman.193.1234966544.11746.python-list@python.org>
Message-ID: <d30ad330-64bc-4690-b604-ad3711d7d5f7@o11g2000yql.googlegroups.com>

On Feb 18, 8:15?am, Steve Holden <st... at holdenweb.com> wrote:
> gtillmon wrote:
> > Hello. ?I am new to the Python language.
> > I would like to know how to display and store the path of each mondule
> > that is called.
>
> Modules are imported, not called.
>
> > Similar to the old READY TRACE in COBOL of long ago.
>
> It's certainly possible to trace function calls, if that would help.
> sys.settrace allows you to establish a function that gets called
> whenever a Python function call is executed. The documentation is a
> little sparse, but you can find a rough example under "Crude Python
> Debugging" in
>
> ?http://www.st.ewi.tudelft.nl/~mol/snippets.php
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/


Thanks for the information.


From steve at holdenweb.com  Wed Feb 18 17:24:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 17:24:20 -0500
Subject: Delete lines which contain string in a file
In-Reply-To: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>
References: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>
Message-ID: <gni1qt$m0h$1@ger.gmane.org>

Rudi Goldman wrote:
> Hi,
> Go easy on me as I am a new to Python and am trying to solve a practical
> problem that is driving me bananas.
> Basically I have 2 text files, a source and a target. I want to be able
> to delete all of the lines in the target file which contain text from
> any line in the source file.
> i.e.
> Source:                                     Target:
> 111                                           xxx 111 yyy   
> 222                                           xxx  333 sss 
> 333                                           jjj   444 sss
> 
> After executing this code the target file should only consist of the
> line:     jjj   444 sss
> Any help on this one would be greatly appreciated.
> 
Is this homework?

How far have you got with your design?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:28:36 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:28:36 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<9ba48cb7-d32b-40ef-a6a6-d2250886379a@l33g2000pri.googlegroups.com>
Message-ID: <fpmdnQqyjasDFgHUnZ2dnUVZ8oaWnZ2d@bt.com>

Thanks for the very speedy reply!

Not sure what your reply means but I have emailed the author with the 
problem!

Cheers

Neil

"sjbrown" <shandy.b at gmail.com> wrote in message 
news:9ba48cb7-d32b-40ef-a6a6-d2250886379a at l33g2000pri.googlegroups.com...
It looks like there may be a bug if you were expecting t to be some
object other than a dict.  You can apparently contact the authour
here:

http://www.briggs.net.nz/log/contact/

On Feb 18, 2:16 pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
> File "<pyshell#3>", line 1, in <module>
> t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil




From http  Wed Feb 18 17:29:06 2009
From: http (Paul Rubin)
Date: 18 Feb 2009 14:29:06 -0800
Subject: number theory libraries / project euler
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <7xljs3751p.fsf@ruckus.brouhaha.com>

eliben <eliben at gmail.com> writes:
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.

The idea of Project Euler is you are supposed to find clever enough
methods to solve the problems that speed of the software libs is NOT
important.  


From catphive at catphive.net  Wed Feb 18 17:31:16 2009
From: catphive at catphive.net (Brendan Miller)
Date: Wed, 18 Feb 2009 14:31:16 -0800
Subject: PyYaml in standard library?
In-Reply-To: <50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
	<50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
Message-ID: <ef38762f0902181431i2d3309efu1c84236b46420906@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:34 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Wed, Feb 18, 2009 at 1:11 AM, Brendan Miller <catphive at catphive.net> wrote:
>> I'm just curious whether PyYaml is likely to end up in the standard
>> library at some point?
>
> I don't personally have a direct answer to your question, but I can
> point out that JSON and YAML are mostly compatible (JSON is almost a
> perfect YAML subset) and the `json` module is already in the Python
> std lib.
>
> Cheers,
> Chris

Yes, JSON is an (I think unintentional) subset of YAML... but a fairly
small subset.

A list in YAML looks like

--- # my list
- Elem 1
- Elem 2

Whereas in JSON you have ["Elem 1", "Elem 2"]. People say JSON is a
subset because YAML will also accept the JSON style syntax if you want
to do something inline for convenience:

--- # my list containing a sublist in the second element.
- Elem 1
- ["Sub elem 1", "Sub elem 2"]

But this is really a special purpose syntax in the context of YAML.

I think the json module sticks everything on the same line, which
isn't readable for large data structures. My impression is YAML is
that is is more readable than JSON, whereas JSON is mostly for browser
interop.


From mensanator at aol.com  Wed Feb 18 17:36:21 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 18 Feb 2009 14:36:21 -0800 (PST)
Subject: number theory libraries / project euler
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <a0863380-eebd-43d9-8dd1-b9db1291966f@w39g2000prb.googlegroups.com>

On Feb 18, 2:18?pm, eliben <eli... at gmail.com> wrote:
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.
>
> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?
>
> Eli

Also check out the gmpy library, lots of good number theory stuff
like factorial, gcd, lcm, linear congruence, is_prime, next_prime,
(I even found a use for the legendre function), etc.

(no factorization, I have Python call the MIRACL factor program when
I need that)

gmpy is so vital to my work that if they ever stop supporting it,
I will abandon Python.


From jeff.dyke at gmail.com  Wed Feb 18 17:44:03 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Wed, 18 Feb 2009 17:44:03 -0500
Subject: SVN/CVS and Branching
Message-ID: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>

Hello.  I am curious about different ideas on how you handle branching
your python projects.  With some other languages this is trivial, but
since python uses these directories as modules and i have the top
level module starting imports all over the place, i am wondering what
others do.  In the past we had retired the first branch and just moved
towards the new, but that is not possible now.

Thanks,
jd


From aisaac at american.edu  Wed Feb 18 17:48:17 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 18 Feb 2009 17:48:17 -0500
Subject: get descriptor from instance
Message-ID: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>

What is a reliable way to get the
the property object for an instance attribute?
(Or more generally, to get the descriptor
controlling an attribute?)

If class ``A`` defines the property ``x`` and ``a``
in an instance of ``A``, then you can just use
``type(a).__dict__['x']`` to get the property object.
But this will not work if the property is inherited.

Thanks,
Alan Isaac


From Scott.Daniels at Acm.Org  Wed Feb 18 17:57:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 14:57:32 -0800
Subject: Newbie Q about Turtle Gfx
In-Reply-To: <FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>
Message-ID: <xYSdnatH2OJTDAHUnZ2dnUVZ_j6WnZ2d@pdx.net>

Neil wrote:
> Forgot to say, that after the error message the turtle window 'hangs' as 
> unresponsive ...
> 
> "Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
> news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
>> Hello
>> I am hoping to use Python to teach a class and have been looking at the 
>> online book 'Snake Wrangling for Kids'.
>>
>> I have followed the example
>>>>> import turtle
>>>>> t=turtle.pen()
>> which works fine and displays a turtle in a window.
>>
>> However whenever I try to use something like
>>>>> t.forward(50)   (taken from the book)
>> i get the error...
>>
>> Traceback (most recent call last):
>>  File "<pyshell#3>", line 1, in <module>
>>    t.forward(50)
>> AttributeError: 'dict' object has no attribute 'forward'


Well, if you
 >>> print(turtle.__doc__)
You'll see that this is a re-implemetation, so expect a few hiccups.

I see, from the following:
 >>> import turtle
 >>> t = turtle.pen()
 >>> print(repr(t))

The pen returned (which you named t) is a simple dictionary.
You can, however, follow up with:
 >>> turtle.forward(23)
 >>> turtle.right(90)
 >>> turtle.forward(32)
 >>> turtle.right(90)
 >>> turtle.forward(23)
 >>> turtle.right(90)
 >>> turtle.forward(32)


Or, if you prefer, you can go:

 >>> t = turtle.Turtle()
 >>> t.forward(30)
 >>> t.left(120)

--Scott David Daniels
Scott.Daniels at Acm.Org


From lionel.keene at gmail.com  Wed Feb 18 18:03:56 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 15:03:56 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com>
Message-ID: <8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com>

On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > post here and hope someone new the answer. I feel it's a silly
> > problem, maybe something to do with a path variable? The problem: I've
> > downloaded the "all-in-one" windows binary installer for PyGTK from
> > their website. After typing in their first tutorial program and trying
> > to run from the command line, I get:
>
> > "This application has failed to start because libglib-2.0-0.dll was
> > not found" error dialog.
>
> > The traceback indicates this is happening at the "import gtk" line. A
> > quick search of my install directory for PyGTK indicates that the file
> > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > Is there some some sort of path variable for Python I need to modify
> > and, if so, how is this done? Thanks so much, and my apologies if this
> > is the wrong forum.
>
> > -L
>
> Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> different traceback error:
>
> "ImportError: no module named pygtk"
>
> I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> Then I displaye the sys.path:
>
> IDLE 1.2>>> import sys
> >>> sys.path
>
> ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> \\Python\\lib\\site-packages']
>
> Every single entry is related to PyGTK and nothing else. Something
> seems wrong here but I don't have enough Python experience to know
> just what. Anyone?- Hide quoted text -
>
> - Show quoted text -

Okay, out of desperation and frustration I've wiped my Python/SciPy/
etc.. setup and reinstalled from scratch. I've tested it with my app
and all the numpy and matplotlib functionality is there and working.
My sys.path seems to be back to normal:

IDLE 1.2.4
>>> import sys
>>> sys.path
['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
\site-packages']

I will now re-install PyGTK and see if it mysteriously decides to work
this time.


From superprad at gmail.com  Wed Feb 18 18:08:55 2009
From: superprad at gmail.com (PK)
Date: Wed, 18 Feb 2009 18:08:55 -0500
Subject: fcntl.fcntl breaking on 64bit
Message-ID: <5b0681910902181508s7ce57487idd0bc21a350f7f56@mail.gmail.com>

Hello Friends:

I'm running into issues with using fcntl on a 64 bit servers.

Python version: 2.4.3

system Arch: # uname -m
x86_64


code keeps erroring out with:

fcntl.fcntl(fd, rhn_fcntl.F_SETLKW, UNLOCK)
IOError: [Errno 22] Invalid argument

The same python code block runs fine on a i386/686.

Does anyone have any thoughts? Is this a known issue? any workarounds?

Any suggestions appreciated.

Thanks,
~ PK
-------------- next part --------------
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From lionel.keene at gmail.com  Wed Feb 18 18:12:32 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 15:12:32 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com> 
	<8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com>
Message-ID: <1198ef28-b2c0-4464-85ad-31798dc0c33f@r15g2000prh.googlegroups.com>

On Feb 18, 3:03?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > > post here and hope someone new the answer. I feel it's a silly
> > > problem, maybe something to do with a path variable? The problem: I've
> > > downloaded the "all-in-one" windows binary installer for PyGTK from
> > > their website. After typing in their first tutorial program and trying
> > > to run from the command line, I get:
>
> > > "This application has failed to start because libglib-2.0-0.dll was
> > > not found" error dialog.
>
> > > The traceback indicates this is happening at the "import gtk" line. A
> > > quick search of my install directory for PyGTK indicates that the file
> > > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > > Is there some some sort of path variable for Python I need to modify
> > > and, if so, how is this done? Thanks so much, and my apologies if this
> > > is the wrong forum.
>
> > > -L
>
> > Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> > different traceback error:
>
> > "ImportError: no module named pygtk"
>
> > I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> > Then I displaye the sys.path:
>
> > IDLE 1.2>>> import sys
> > >>> sys.path
>
> > ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> > \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> > \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> > \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> > \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> > \\Python\\lib\\site-packages']
>
> > Every single entry is related to PyGTK and nothing else. Something
> > seems wrong here but I don't have enough Python experience to know
> > just what. Anyone?- Hide quoted text -
>
> > - Show quoted text -
>
> Okay, out of desperation and frustration I've wiped my Python/SciPy/
> etc.. setup and reinstalled from scratch. I've tested it with my app
> and all the numpy and matplotlib functionality is there and working.
> My sys.path seems to be back to normal:
>
> IDLE 1.2.4>>> import sys
> >>> sys.path
>
> ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> \site-packages']
>
> I will now re-install PyGTK and see if it mysteriously decides to work
> this time.- Hide quoted text -
>
> - Show quoted text -

Nope. Now I'm getting:

"The applciation has failed to start because MSVCR80.dll was not
found."

Don't know what else to try here. Anyone have any ideas?


From robert.kern at gmail.com  Wed Feb 18 18:12:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 18 Feb 2009 17:12:41 -0600
Subject: Can't get the IPYthon ipapi object working
In-Reply-To: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
References: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
Message-ID: <gni4la$v39$1@ger.gmane.org>

On 2009-02-18 15:49, beetlecube wrote:
> Hi , I found out from a random google search that I could use IPython
> to automatically import modules so that I could test Django views.
>
> I downloaded it (WIN XP), installed it.  I'm able to import it, but I
> just can't seem to get the object working.
>
> The code:
> -----------------------------------
> try:
>      import IPython.ipapi
>      ip = IPython.ipapi.get()
>      a = ip.options
>      ip.ex('import os')
>
> except Exception,msg:
>      print "Message: ", msg
> -------------------------------------------
>
> I get: ' Message:  'NoneType' object has no attribute 'options' '
>
> If I remove the ip.options statement, it will say the same thing about
> attribute 'ex'

This needs to be run in the context of a running instance IPython, not just any 
other module. That kind of code is usually put into your c:\Documents and 
Settings\username\_ipython\ipy_user_conf.py file.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From gagsl-py2 at yahoo.com.ar  Wed Feb 18 18:15:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 21:15:10 -0200
Subject: get descriptor from instance
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
Message-ID: <op.upkljkimx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 20:48:17 -0200, Alan G Isaac <aisaac at american.edu>  
escribi?:

> What is a reliable way to get the
> the property object for an instance attribute?
> (Or more generally, to get the descriptor
> controlling an attribute?)
>
> If class ``A`` defines the property ``x`` and ``a``
> in an instance of ``A``, then you can just use
> ``type(a).__dict__['x']`` to get the property object.
> But this will not work if the property is inherited.

type(a).x

py> class A(object):
...   def getx(self): return 1
...   x = property(getx)
...
py> class B(A):
...   pass
...
py> b=B()
py> b.x
1
py> B.x
<property object at 0x00B8A690>
py> type(b).x
<property object at 0x00B8A690>
py> getattr(type(b),'x')
<property object at 0x00B8A690>
py>

-- 
Gabriel Genellina



From mensanator at aol.com  Wed Feb 18 18:43:29 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 18 Feb 2009 15:43:29 -0800 (PST)
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <f52959c2-45ba-4eff-83df-6ba191cd29bd@b38g2000prf.googlegroups.com>

On Feb 18, 4:16?pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()

You defined "t" to be a pen object, not a turtle object.

>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) ? (taken from the book)

Pens don't move, turtles move (and the pen the turtle is
carrying draws a line, if down).

>
> i get the error...
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.

Pens can't turn left, turtles turn left.

>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil

Here's an example. It draws a Minimal Spanning Tree.

If you don't need an MST, take note of how I use the turtle.

import turtle
import random
import copy

def build_sv(start,stop,limit,C):
  """Sequence Vector Generator

  build_sv(start,stop,limit,C)
  start: start of Collatz sequence (must be odd)
  stop:  sequence termination
  limit: max length of [sv] if stop not found
       limit is sum(sv), not len(sv)
  C:     C of 3n+C
  returns [] if invalid
  returns SequenceVector [sv]
  """
  ONE = 1
  TWO = 2
  TWE = 3

  sv = []
  if (start % 2)==0: return sv
  done = 0
  count = 0
  while done==0:
    #
    # oops, power division may skip past stopping point
    # without seeing it
    #
    start = TWE*start + C
    f = 0
    t = start
    while t%2==0:
      f += 1
      t /= 2
    g = 0                      # stopping point may occur before f is
reached
    while (not done) and g<f:
      start = start >> 1
      if start==stop: done = 1
      count += 1
      g += 1
      if count==limit: done = 1
    sv.append(g)
  return sv

def Type12MH(k,i):
  """Find ith, kth Generation Type [1,2] Mersenne Hailstone using the
closed form equation

  Type12MH(k,i)
  k: generation
  i: member of generation
  returns Hailstone (a)
  """
  ONE = 1
  TWO = 2
  SIX = 6
  NIN = 9

  if (k<1) or (i<1): return 0

  a = (i-ONE)*NIN**(k-ONE) + (NIN**(k-ONE) - ONE)/TWO + ONE
  return TWO**(SIX*a - ONE) - ONE



turtle.clear()
turtle.up()

the_window = (turtle.window_width(),turtle.window_height())
print the_window,
turtle.goto(0,0)
tooter = turtle.position()
buffer_L = -((the_window[0]-200)/2)
buffer_R = (the_window[0]-200)/2
buffer_T = (the_window[1]-200)/2
buffer_B = -((the_window[1]-200)/2)
print buffer_L,buffer_R,buffer_T,buffer_B

turtle.tracer(False)
turtle.down()
turtle.speed('fastest')
t = 0
turtle.setheading(t)

for j in range(1):
  p = Type12MH(4,2)  # Type12 Mersenne Hailstone (very big)
  sv = build_sv(p,1,10000000,1) # limit to 10 million numbers in
vector


# Minimal Spanning Tree
  stars = []
  turtle.up()
  for d in sv:                         # random turtle crawl based on
sv
    if d>1:                          # skip small sv values for
movement
      for r in xrange(1):
        turtle.setheading(t+r*90)
        turtle.forward(d*4)      # scale of grid
      tooter = turtle.position()
      if d>8:                      # create a star at really large sv
values
        turtle.down()
        turtle.width(3)
        turtle.color('black')
        turtle.forward(1)        # draw a blob
        turtle.backward(1)
        stars.append((int(tooter[0]),int(tooter[1])))
        turtle.up()
        turtle.width(1)
        turtle.color('red')      # color of MST spans
      whither_tooter = []          # build list of legal next turns
      if tooter[0]>buffer_L:       # test for being too close to
screen edge
        whither_tooter.append(180)
      if tooter[0]<buffer_R:
        whither_tooter.append(0)
      if tooter[1]<buffer_T:
        whither_tooter.append(90)
      if tooter[1]>buffer_B:
        whither_tooter.append(270)
      t = random.choice(whither_tooter) # choose random direction from
list of legal moves
  print 'stars:',len(stars)

  star_dist = []                      # create list of spans between
stars
  for i,src in enumerate(stars):
    for j,dst in enumerate(stars):
      dist = turtle.sqrt((src[0]-dst[0])**2 + (src[1]-dst[1])**2)
      if dist == 0:
        star_dist.append([9999,i,j])
      else:
        star_dist.append([dist,i,j])

  star_dist.sort()

  MST = []                            # spans of MST
  MST2 = []                           # only those spans that can
connect to existing MST
  points_used = {}                    # list of stars that are
currently on MST

  s = copy.deepcopy(star_dist[0])     # going to modify list element,
so deep copy needed
  MST.append(s)                       # fist span always smallest
absolute distance
  points_used[s[1]] = 1
  points_used[s[2]] = 1
  star_dist[0][0] = 9999              # overwrite distance so this
span can't be used again
  found = False                       # also, overwrite complement
span
  si = 0
  while not found:
    ss = star_dist[si]
    if s[1]==ss[2] and s[2]==ss[1]: # the complement
      star_dist[si][0] = 9999
      found = True
    else:
      si += 1
  while len(MST)<(len(stars)-1):        # an MST of n points always
has n-1 spans
    for i,sd in enumerate(star_dist): # copy points matching s to MST2
      # only spans that could connect to existing
      # tree points can be added at this stage
      # (only have to check for last added to MST)
      if (sd[0]!=9999) and  \
         ((sd[1]==s[1]) or  \
        (sd[1]==s[2]) or  \
        (sd[2]==s[1]) or  \
        (sd[2]==s[2])):
        MST2.append(copy.deepcopy(sd))
        star_dist[i][0] = 9999    # once copied to MST2, overwrite
original distance
    MST2.sort()
    close = 0
    #
    # can't use a span if BOTH points already on MST, otherwise we get
loops
    # and some stars remain disjoint
    #
    while ((MST2[close][1] in points_used) and (MST2[close][2] in
points_used)):
      close += 1
    s = copy.deepcopy(MST2[close])
    MST.append(s)
    if s[1] in points_used:           # only keys used to create tree,
values
      points_used[s[1]] += 1        # will eventully be number of
points
    else:                             # connected to this point
      points_used[s[1]] = 1
    if s[2] in points_used:
      points_used[s[2]] += 1
    else:
      points_used[s[2]] = 1
    MST2[close][0] = 9999             # overwrite this point and its
complement
    found = False
    si = 0
    while not found:
      ss = MST2[si]
      if s[1]==ss[2] and s[2]==ss[1]: # the duplicate
        MST2[si][0] = 9999
        found = True
      else:
        si += 1
        if si == len(MST2): found = True

  for span in MST:               # from an MST span
    srcx = stars[span[1]][0]   # get coords of two endpoints
    srcy = stars[span[1]][1]
    dstx = stars[span[2]][0]
    dsty = stars[span[2]][1]
    turtle.up()                # and draw a line between them
    turtle.goto(srcx,srcy)
    turtle.down()
    turtle.goto(dstx,dsty)





From sturlamolden at yahoo.no  Wed Feb 18 19:23:32 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 16:23:32 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com>

On 18 Feb, 00:08, Lionel <lionel.ke... at gmail.com> wrote:

> 1) What is "recarray"?

An ndarray of what C programmers know as a "struct", in which each
field is accessible by its name.

That is,

struct rgba{
  unsigned char r;
  unsigned char g;
  unsigned char b;
  unsigned char a;
};

struct rgba arr[480][640];

is similar to:

import numpy as np
rbga = np.dtype({'names':list('rgba'), 'formats':[np.uint8]*4})
arr = np.array((480,640), dtype=rgba)

Now you can access the r, g, b and a fields directly using arr['r'],
arr['g'], arr['b'], and arr['a'].
Internally the data will be represented compactly as with the C code
above. If you want to view the data as an 480 x 640 array of 32 bit
integers instead, it is as simple as arr.view(dtype=np.uint32).
Formatted binary data can of course be read from files using
np.fromfile with the specified dtype, and written to files by passing
a recarray as buffer to file.write. You can thus see NumPy's
recarray's as a more powerful alternative to Python's struct module.


> I don't really see in the diocumentation how portions are loaded, however.

Prior to Python 2.6, the mmap object (which numpy.memmap uses
internally) does not take an offset parameter. But when NumPy are
ported to newer version of Python this will be fixed. You should then
be able to memory map with an ndarray from a certain offset. To make
this work now, you must e.g. backport mmap from Python 2.6 and use
that with NumPy. Not difficult, but nobody has bothered to do it (as
far as I know).



Sturla Molden


From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 19:26:48 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Thu, 19 Feb 2009 00:26:48 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d@bt.com>

Thanks everyone!

It appears the info in the book is wrong. Trying what you have all suggested
has got it to work!

Many thanks, and I am sure I will be back here again with other newbie
problems!

Neil

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very 
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the 
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
>>>>import turtle
>>>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
>>>>t.forward(50)   (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
>  File "<pyshell#3>", line 1, in <module>
>    t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil
>
>
> 




From SiteContactUs at gmail.com  Wed Feb 18 19:29:09 2009
From: SiteContactUs at gmail.com (beetlecube)
Date: Wed, 18 Feb 2009 16:29:09 -0800 (PST)
Subject: Can't get the IPYthon ipapi object working
References: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
	<mailman.216.1234998776.11746.python-list@python.org>
Message-ID: <57ecb5ae-3348-40bd-8b32-51c33e706635@x29g2000prf.googlegroups.com>

On Feb 18, 3:12?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-18 15:49, beetlecube wrote:
>
>
>
> > Hi , I found out from a random google search that I could use IPython
> > to automatically import modules so that I could test Django views.
>
> > I downloaded it (WIN XP), installed it. ?I'm able to import it, but I
> > just can't seem to get the object working.
>
> > The code:
> > -----------------------------------
> > try:
> > ? ? ?import IPython.ipapi
> > ? ? ?ip = IPython.ipapi.get()
> > ? ? ?a = ip.options
> > ? ? ?ip.ex('import os')
>
> > except Exception,msg:
> > ? ? ?print "Message: ", msg
> > -------------------------------------------
>
> > I get: ' Message: ?'NoneType' object has no attribute 'options' '
>
Shoulda know I was doing something fundamentally wrong.
Thanks a lot!
> > If I remove the ip.options statement, it will say the same thing about
> > attribute 'ex'
>
> This needs to be run in the context of a running instance IPython, not just any
> other module. That kind of code is usually put into your c:\Documents and
> Settings\username\_ipython\ipy_user_conf.py file.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco



From bhood37 at hotmail.com  Wed Feb 18 19:33:14 2009
From: bhood37 at hotmail.com (Uberman)
Date: Wed, 18 Feb 2009 17:33:14 -0700
Subject: Calling a class instance like a function
Message-ID: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>

I'm wondering if there's a way to invoke a "function" operator on a Python
class instance.  For example, given a class instance:

	myClass = MyClass()

I want to call that instance like a function, with an argument value:

	myClass(5.0)

I can override the "()" operator in C++, so I'm wondering if there's a way to
do it in Python as well.

Thanks!


From gert.cuykens at gmail.com  Wed Feb 18 19:33:31 2009
From: gert.cuykens at gmail.com (gert)
Date: Wed, 18 Feb 2009 16:33:31 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<mailman.177.1234942519.11746.python-list@python.org>
Message-ID: <90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>

On Feb 18, 8:25?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "gert" <gert.cuyk... at gmail.com>wrote:
>
> > After reading the docs and seeing a few examples i think this should
> > work ?
> > Am I forgetting something here or am I doing something stupid ?
> > Anyway I see my yellow screen, that has to count for something :)
>
> > from tkinter import *
> > from threading import Thread
>
> > class Weegbrug(Thread):
> > ? ? def __init__(self,v):
> > ? ? ? ? self.v=v
> > ? ? ? ? Thread.__init__(self)
> > ? ? def run(self):
> > ? ? ? ? while True:
> > ? ? ? ? ? ? with open('com1','r') as f:
> > ? ? ? ? ? ? ? ? ?for line in f:
> > ? ? ? ? ? ? ? ? ? ? ?self.v.set(line[2:-1])
>
> It is in general not a good idea to directly
> access GUI variables from outside the
> GUI main loop.
> There is a recipe for doing this sort of thing,
> but as usual I have lost the reference.
> What it does is that instead of interfering directly
> as above, you put the data on a queue.
>
> Then, you use the after() call to set up a call
> to a routine that reads the queue, and configures the
> display, and then uses after again to call itself again
> after a time, thereby keeping the GUI stuff in the GUI
> mainloop.
>

from tkinter import *
from threading import Thread

class Weegbrug(Thread):
    def __init__(self):
        self.display='00000'
        Thread.__init__(self)
    def run(self):
        x=0
        while True:
            x=x+1
            self.display=x
            #with open('com1','r') as f:
            #     for l in f:
            #         self.display=l[2:-1]

root = Tk()
v = StringVar()
v.set('00000')
w = Weegbrug()
w.start()
tx = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
tx.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, v.set(w.display))
root.mainloop()

Why does this not work ?
It only shows one result ?


From pofuk at email.t-com.hr  Wed Feb 18 19:38:45 2009
From: pofuk at email.t-com.hr (SMALLp)
Date: Thu, 19 Feb 2009 01:38:45 +0100
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
	<87ocwzzvym.fsf@mulj.homelinux.net>
Message-ID: <gni9mm$bv0$1@ss408.t-com.hr>

Thanks for help!

My problem was actualy:
>>> a = ["velja\xe8a 2009"]
>>> print a    #will print
["velja\xe8a 2009"]
>>> Print a[0]    #will print
velja?a 2009

"Hrvoje Niksic" <hniksic at xemacs.org> wrote in message 
news:87ocwzzvym.fsf at mulj.homelinux.net...
> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:
>
>>> I'm playing with os.popen function.
>>> a = os.popen("somecmd").read()
>>>
>>> If one of the lines contains characters like "e", "a"or any other it 
>>> loks
>>> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>>>
>>> for i in a:
>>>     print i:
>>
>> '\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E
>> WITH  GRAVE' Unicode code point u'e' encoded in the Windows-1252
>> encoding (and  latin-1, and others too).
>
> Note that it is also 'LATIN SMALL LETTER C WITH CARON' (U+010D or
> u'?'), encoded in Windows-1250, which is what the OP is likely using.
>
> The rest of your message stands regardless: there is no problem, at
> least as long as the OP only prints out the character received from
> somecmd to something else that also expects Windows-1250.  The problem
> would arise if the OP wanted to store the string in a PyGTK label
> (which expects UTF8) or send it to a web browser (which expects
> explicit encoding, probably defaulting to UTF8), in which case he'd
> have to disambiguate whether '\xe8' refers to U+010D or to U+00E8 or
> something else entirely.
>
> That is the problem that Python 3 solves by requiring (or strongly
> suggesting) that such disambiguation be performed as early in the
> program as possible, preferrably while the characters are being read
> from the outside source.  A similar approach is possible using Python
> 2 and its unicode type, but since the OP never specified exactly which
> problem he had (except for the repr/str confusion), it's hard to tell
> if using the unicode type would help. 




From andrew at acooke.org  Wed Feb 18 19:40:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 18 Feb 2009 21:40:33 -0300 (CLST)
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
Message-ID: <a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>


maybe this is just me, but i don't have a clue what your problem is.  what
does "starting imports all over the place" mean?  what do you mean by
"retired"?

i use svn with python in exactly the same way as with java (and, i
thought, in the same way as anyone uses svn with any language; java uses
the directory structure as a package structure too).

maybe someone else will reply, but if not it might help to explain a
little more detail.

andrew


Jeff Dyke wrote:
> Hello.  I am curious about different ideas on how you handle branching
> your python projects.  With some other languages this is trivial, but
> since python uses these directories as modules and i have the top
> level module starting imports all over the place, i am wondering what
> others do.  In the past we had retired the first branch and just moved
> towards the new, but that is not possible now.




From gruszczy at gmail.com  Wed Feb 18 19:42:57 2009
From: gruszczy at gmail.com (=?UTF-8?Q?Filip_Gruszczy=C5=84ski?=)
Date: Thu, 19 Feb 2009 01:42:57 +0100
Subject: Calling a class instance like a function
In-Reply-To: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
Message-ID: <1be78d220902181642q4cbb1682rf27948eccf311271@mail.gmail.com>

__call__

2009/2/19 Uberman <bhood37 at hotmail.com>:
> I'm wondering if there's a way to invoke a "function" operator on a Python
> class instance.  For example, given a class instance:
>
>        myClass = MyClass()
>
> I want to call that instance like a function, with an argument value:
>
>        myClass(5.0)
>
> I can override the "()" operator in C++, so I'm wondering if there's a way to
> do it in Python as well.
>
> Thanks!
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Filip Gruszczy?ski


From sturlamolden at yahoo.no  Wed Feb 18 19:50:58 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 16:50:58 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com> 
	<mailman.9205.1234248235.3487.python-list@python.org>
	<d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>
Message-ID: <64c334d7-434f-4ec3-8ccb-35e8088a0cb2@u13g2000yqg.googlegroups.com>

On Feb 10, 8:38?am, Paul McGuire <pt... at austin.rr.com> wrote:

> Even worse than linear, the function is recursive, which as I
> understand it, is inherently a no-no when looking for code that is
> parallel-friendly.

There is no way to parallelize Fibonacci numbers computed with linear
time complexity, as we must know fib(n-1) to compute fib(n). But if we
were to use Oyster's recursive version, which has geometric
complexity, one could parallelize with a 'forkjoin' scheme.

Anyhow, this runs in amortized linear time and would be a lot faster:

def fib(n):
   while True:
      try:
         return fib.seq[n]
      except AttributeError:
         fib.seq = [0, 1, 1]
      except IndexError:
         fib.seq.append( fib.seq[-2] +
                          fib.seq[-1] )

S.M.


From Scott.Daniels at Acm.Org  Wed Feb 18 20:02:55 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 17:02:55 -0800
Subject: Threading and tkinter
In-Reply-To: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
Message-ID: <F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>

gert wrote:
> After reading the docs and seeing a few examples i think this should
> work ?
> Am I forgetting something here or am I doing something stupid ?
> Anyway I see my yellow screen, that has to count for something :)
> 
Try this:
# tdh_show.py
from __future__ import with_statement

import time
import Tkinter
import Tkconstants as TK
import threading

class Weegbrug(threading.Thread):
     def __init__(self, frame, var, filename):
         self.frame = frame
         self.var = var
         self.filename = filename
         threading.Thread.__init__(self)

     def run(self):
         with open(self.filename, 'r') as f:
             for n, line in enumerate(f):
                 # the tricky bit:
                 self.frame.after(100, self.var.set, line.strip())
                 time.sleep(.5)


def main(filename):
     root = Tkinter.Tk()
     svar = Tkinter.StringVar(root)
     frame = Tkinter.Frame(root, relief=TK.RIDGE, borderwidth=2)
     frame.pack(fill=TK.BOTH, expand=1)
     label = Tkinter.Label(frame, textvar=svar, bg='yellow',
                           font=('Helvetica', 16))
     label.pack(fill=TK.X, expand=1)
     button = Tkinter.Button(frame, text="Exit", command=root.destroy)
     button.pack(side=TK.BOTTOM)
     reader = Weegbrug(frame, svar, filename)
     button = Tkinter.Button(frame, text="Go", command=reader.start)
     button.pack(side=TK.BOTTOM)
     root.mainloop()


if __name__ == '__main__':
     main(__file__)


--Scott David Daniels
Scott.Daniels at Acm.Org


From http  Wed Feb 18 20:31:58 2009
From: http (Paul Rubin)
Date: 18 Feb 2009 17:31:58 -0800
Subject: PyYaml in standard library?
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
	<50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
	<mailman.213.1234996769.11746.python-list@python.org>
Message-ID: <7x63j72ovl.fsf@ruckus.brouhaha.com>

Brendan Miller <catphive at catphive.net> writes:
> I think the json module sticks everything on the same line, which
> isn't readable for large data structures.

It has a prettyprint option.


From bhood37 at hotmail.com  Wed Feb 18 20:32:11 2009
From: bhood37 at hotmail.com (Uberman)
Date: Wed, 18 Feb 2009 18:32:11 -0700
Subject: Calling a class instance like a function
In-Reply-To: <mailman.219.1235004180.11746.python-list@python.org>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
	<mailman.219.1235004180.11746.python-list@python.org>
Message-ID: <yE2nl.200422$zQ4.71364@en-nntp-02.dc1.easynews.com>

Thank you very much, Filip!!  :)

Filip Gruszczy?ski wrote:
> __call__
> 
> 2009/2/19 Uberman <bhood37 at hotmail.com>:
>> I'm wondering if there's a way to invoke a "function" operator on a Python
>> class instance.  For example, given a class instance:
>>
>>        myClass = MyClass()
>>
>> I want to call that instance like a function, with an argument value:
>>
>>        myClass(5.0)
>>
>> I can override the "()" operator in C++, so I'm wondering if there's a way to
>> do it in Python as well.
>>
>> Thanks!
>> --
>> http://mail.python.org/mailman/listinfo/python-list


From cokofreedom at gmail.com  Wed Feb 18 20:35:16 2009
From: cokofreedom at gmail.com (cokofreedom at gmail.com)
Date: Wed, 18 Feb 2009 17:35:16 -0800 (PST)
Subject: Timeit
Message-ID: <95457df7-57ac-4d5c-b68d-2bd804ae3c90@x38g2000yqj.googlegroups.com>

I've having an annoying problem at the moment. I'm writing code for
the travelling salesmen problem and comparing different techniques.
But I've having a problem using timeit.

I have a file called "testplatform.py" that contains 4 class:
Test() - which is called first to create the cities/routes to be
shared between the other classes
AutoClone() - which uses the variables from Test() (normally test =
Test())
Randomisation() - Ditto
BruteForce() - Ditto

if __name__ == '__main__':
....test = Test(5, 1000, 100, 100, 100, 14)
....example1 = AutoClone(test.citynames, test.cityroutes, test.seed,
........................test.generations, test.mutate)
....example2 = Randomisation(test.citynames, test.cityroutes,
test.seed,
........................test.generations)
....example3 = BruteForce(test.citynames, test.cityroutes)

I am really stuck trying to work out how to pass variables to timeit
to allow me to run any of the examples...

Any help would be great!


From sturlamolden at yahoo.no  Wed Feb 18 20:36:25 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 17:36:25 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
Message-ID: <11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>

On Feb 10, 7:28?am, oyster <lepto.pyt... at gmail.com> wrote:
> I mean this
> [code]
> def fib(n):
> ? ? if n<=1:
> ? ? ? ? return 1
> ? ? return fib(n-1)+fib(n-2)


Let's rewrite that slightly and see...



def fib(n, _map=None):
    if not _map: _map = map
    if n > 2:
        return sum(_map(fib, (n-1, n-2)))
    else:
        return 1


if __name__ == '__main__':

    from multiprocessing import Pool
    from time import clock

    p = Pool()
    n = 36

    t0 = clock()
    fib(n, p.map)
    t1 = clock()

    print 'parallel t: %f seconds' % (t1-t0)

    t0 = clock()
    fib(n)
    t1 = clock()

    print 'sequential t: %f seconds' % (t1-t0)


With two cores:

E:\>python fibotest.py
parallel t: 31.300226 seconds
sequential t: 48.070695 seconds


Yes it can!




Sturla Molden


From gert.cuykens at gmail.com  Wed Feb 18 21:06:03 2009
From: gert.cuykens at gmail.com (gert)
Date: Wed, 18 Feb 2009 18:06:03 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
Message-ID: <6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>

Can you first explain why x stay's 0 please and how i should update x
using threads ?

from tkinter import *
from _thread import start_new_thread
from time import sleep

x=0
def weegbrug(x):
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,(x,))

root = Tk()
v = StringVar()
v.set("00000")
txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
font=("Helvetica", 300))
txt.pack(expand=YES, fill=BOTH)
root.title("Weegbrug")
root.after(500, lambda:v.set(x))
root.mainloop()




From pavlovevidence at gmail.com  Wed Feb 18 21:13:25 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 18:13:25 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com>
Message-ID: <ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com>

On Feb 18, 4:23?pm, sturlamolden <sturlamol... at yahoo.no> wrote:
> On 18 Feb, 00:08, Lionel <lionel.ke... at gmail.com> wrote:
>
> > 1) What is "recarray"?
>
> An ndarray of what C programmers know as a "struct", in which each
> field is accessible by its name.
>
> That is,
>
> struct rgba{
> ? unsigned char r;
> ? unsigned char g;
> ? unsigned char b;
> ? unsigned char a;
>
> };
>
> struct rgba arr[480][640];
>
> is similar to:
>
> import numpy as np
> rbga = np.dtype({'names':list('rgba'), 'formats':[np.uint8]*4})
> arr = np.array((480,640), dtype=rgba)
>
> Now you can access the r, g, b and a fields directly using arr['r'],
> arr['g'], arr['b'], and arr['a'].
> Internally the data will be represented compactly as with the C code
> above. If you want to view the data as an 480 x 640 array of 32 bit
> integers instead, it is as simple as arr.view(dtype=np.uint32).
> Formatted binary data can of course be read from files using
> np.fromfile with the specified dtype, and written to files by passing
> a recarray as buffer to file.write. You can thus see NumPy's
> recarray's as a more powerful alternative to Python's struct module.
>
> > I don't really see in the diocumentation how portions are loaded, however.
>
> Prior to Python 2.6, the mmap object (which numpy.memmap uses
> internally) does not take an offset parameter. But when NumPy are
> ported to newer version of Python this will be fixed. You should then
> be able to memory map with an ndarray from a certain offset. To make
> this work now, you must e.g. backport mmap from Python 2.6 and use
> that with NumPy. Not difficult, but nobody has bothered to do it (as
> far as I know).

You can use an offset with numpy.memmap today; it'll mmap the whole
file, but start the array data at the given offset.

The offset parameter of mmap itself would be useful to map small
portions of gigabyte-sized files, and maybe numpy.memmap can take
advantage of that if the user passes an offset parameter.  One thing
you can't do with mmap's offset, but you can do with numpy.memmap, is
to set it to an arbitary value, since it has to be a multiple of some
large number (something like 1 MB, depending on the OS).


Carl Banks


From jnoller at gmail.com  Wed Feb 18 21:14:06 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Wed, 18 Feb 2009 21:14:06 -0500
Subject: PyYaml in standard library?
In-Reply-To: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
Message-ID: <4222a8490902181814s48987502x394008858797d55@mail.gmail.com>

On Wed, Feb 18, 2009 at 4:11 AM, Brendan Miller <catphive at catphive.net> wrote:
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Personally, loving the hell out of yaml (and pyyaml) as much as I do,
I'd love to see this; however interested people should pass the idea
to python-ideas, and write a PEP. It would need a dedicated maintainer
as well as the other things stdlib modules require.

-jesse


From jnoller at gmail.com  Wed Feb 18 21:16:11 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Wed, 18 Feb 2009 21:16:11 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
In-Reply-To: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
Message-ID: <4222a8490902181816j708f0b5y81b246e5a0fa800d@mail.gmail.com>

On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
<Graham.Dumpleton at gmail.com> wrote:
> Why is the multiprocessing module, ie., multiprocessing/process.py, in
> _bootstrap() doing:
>
>  os.close(sys.stdin.fileno())
>
> rather than:
>
>  sys.stdin.close()
>
> Technically it is feasible that stdin could have been replaced with
> something other than a file object, where the replacement doesn't have
> a fileno() method.
>
> In that sort of situation an AttributeError would be raised, which
> isn't going to be caught as either OSError or ValueError, which is all
> the code watches out for.
>
> Graham
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I don't know why it was implemented that way. File an issue on the
tracker and assign it to me (jnoller) please.


From steve at holdenweb.com  Wed Feb 18 21:20:13 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 21:20:13 -0500
Subject: Threading and tkinter
In-Reply-To: <6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
Message-ID: <gnifks$rb1$1@ger.gmane.org>

gert wrote:
> Can you first explain why x stay's 0 please and how i should update x
> using threads ?
> 
> from tkinter import *
> from _thread import start_new_thread
> from time import sleep
> 
> x=0
> def weegbrug(x):
>     while True:
>         x=x+1
>         sleep(0.5)
> start_new_thread(weegbrug,(x,))
> 
> root = Tk()
> v = StringVar()
> v.set("00000")
> txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
> font=("Helvetica", 300))
> txt.pack(expand=YES, fill=BOTH)
> root.title("Weegbrug")
> root.after(500, lambda:v.set(x))
> root.mainloop()
> 
The reason x stays at zero has nothing to do with threading.

The statement

    x=x+1

(which, by the way, should stylistically be written

    x = x + 1

if you want your code to be readable) doesn't change anything outside
the function. Function arguments are values: since x is a parameter of
the function, it exists only inside the function call's namespace.

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From justinli79 at gmail.com  Wed Feb 18 21:29:02 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 18:29:02 -0800 (PST)
Subject: Building python with sqlite3
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
	<mailman.180.1234948423.11746.python-list@python.org>
Message-ID: <1c1605a8-006c-455d-9120-962a61c9082d@x29g2000prf.googlegroups.com>

On Feb 18, 5:13?pm, Christian Heimes <li... at cheimes.de> wrote:
> Justin Li schrieb:
>
> > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > make, make install, to import sqlite3 leads to ImportError. It looks
> > like I have to build Python with sqlite. I have sqlite3 installed on
> > my system. How should I build Python with it? I did not find any
> > options relating with sqlite3 of configure and Makefile.
>
> Do you have the development files installed as well? Run "make" again
> and look at the list of missing modules.
>
> Christian

Thanks for your reply, Christian.

And yes, I have. I looked into this. I'm working on a 64bit machine.
And the sqlite3 is 64bit as well. Should I install a 32bit sqlite3? I
think when I building python, the configure program should detect if
my system 32bit or 64bit one and look for proper sqlite3 version.

Is that the problem?

Thanks again,
Justin


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 21:58:32 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 Feb 2009 02:58:32 GMT
Subject: Timeit
References: <95457df7-57ac-4d5c-b68d-2bd804ae3c90@x38g2000yqj.googlegroups.com>
Message-ID: <pan.2009.02.19.02.58.32@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 17:35:16 -0800, cokofreedom wrote:

> I am really stuck trying to work out how to pass variables to timeit to
> allow me to run any of the examples...

setup = "from __main__ import example1, example2, example3"
Timer("example1()", setup)


In Python 2.6 you can also pass function objects directly.


-- 
Steven


From rdmurray at bitdance.com  Wed Feb 18 22:15:59 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 19 Feb 2009 03:15:59 +0000 (UTC)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
	<788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com>
Message-ID: <gniitf$1uu$1@ger.gmane.org>

Thomas Allen <thomasmallen at gmail.com> wrote:
> On Feb 18, 4:51 am, alex23 <wuwe... at gmail.com> wrote:
> > On Feb 18, 7:34 pm, rdmur... at bitdance.com wrote:
> >
> > > Yeah, but wget -r -k will do that bit of it, too.
> >
> > Wow, nice, I don't know why I never noticed that. Cheers!
> 
> Hm...doesn't do that over here. I thought it may have been because of
> absolute links (not to site root), but it even leaves things like <a
> href="/">. Does it work for you guys?

It works for me.  The sample pages I just tested on it don't use
any href="/" links, but my 'href="/about.html"' got properly
converted to 'href="../about.html"'.  (On the other hand my '/contact.html'
got converted to a full external URL...but that's apparently because the
contact.html file doesn't actually exist :)

--RDM



From alan.isaac at gmail.com  Wed Feb 18 22:29:17 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 03:29:17 GMT
Subject: block dynamic attribute creation (was: get descriptor from
	instance)
In-Reply-To: <mailman.217.1234998934.11746.python-list@python.org>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
Message-ID: <hm4nl.271$tw4.14@nwrddc01.gnilink.net>

On 2/18/2009 6:15 PM Gabriel Genellina apparently wrote:
> type(a).x 

OK, that's good.  I'd like to sometimes lock attribute creation on
instances of a class but still allow properties to function
correctly.  Will something like below be satisfactory?

Thanks,
Alan

   def __setattr__(self, attr, val):
     """If instance locked, allow no new attributes."""
     try:
       #get the class attribute if it exists
       p = getattr(type(self),attr)
       #if it's a descriptor, use it to set val
       p.__set__(self, val)
     except AttributeError: #no descriptor
       if hasattr(self, attr): #update val
         self.__dict__[attr] = val
       elif getattr(self, '_attrlock', False):
         raise AttributeError(
         "Set _attrlock to False to add attributes.")
       else:
         #new attributes allowed
         self.__dict__[attr] = val


From sri_annauni at yahoo.co.in  Wed Feb 18 23:22:09 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Thu, 19 Feb 2009 09:52:09 +0530 (IST)
Subject: Python Module for console text formatting?
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
	<f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>
Message-ID: <208530.16726.qm@web7908.mail.in.yahoo.com>

Hi,
Is it possible to apply more than one formatting to a string? 
For ex: the string 'test' has to be underlined and it should be bold. How to do that?

Thanks,
Srini


________________________________
From: geremy condra <cto at openmigration.net>
To: python-list at python.org
Sent: Wednesday, 18 February, 2009 10:04:34 AM
Subject: Re: Python Module for console text formatting?

You can insert those codes just like you would any other character. If there's enough interest I can whip up a wrapper library for you.

http://www.linux.gr/cgi-bin/man2html?console_codes+4


On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <sri_annauni at yahoo.co.in> wrote:


Hi,
Does anyone know any python module other than 'ConsoleFormat0.1.1' used to format text on console?
For example, printing bold characters on console.

Thanks,
Srini


? ? ?Did you know? You can CHAT without downloading messenger. Go to http://in.webmessenger.yahoo.com/
--
http://mail.python.org/mailman/listinfo/python-list



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at http://OpenMigration.net.



      Share files, take polls, and make new friends - all under one roof. Go to http://in.promos.yahoo.com/groups/
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From Graham.Dumpleton at gmail.com  Thu Feb 19 00:23:10 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 18 Feb 2009 21:23:10 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
Message-ID: <c74d2255-2dd4-466c-8f19-ea14965f0afd@q30g2000prq.googlegroups.com>

On Feb 19, 1:16?pm, Jesse Noller <jnol... at gmail.com> wrote:
> On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
>
>
>
> <Graham.Dumple... at gmail.com> wrote:
> > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > _bootstrap() doing:
>
> > ?os.close(sys.stdin.fileno())
>
> > rather than:
>
> > ?sys.stdin.close()
>
> > Technically it is feasible that stdin could have been replaced with
> > something other than a file object, where the replacement doesn't have
> > a fileno() method.
>
> > In that sort of situation an AttributeError would be raised, which
> > isn't going to be caught as either OSError or ValueError, which is all
> > the code watches out for.
>
> > Graham
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> I don't know why it was implemented that way. File an issue on the
> tracker and assign it to me (jnoller) please.

Created as:

  http://bugs.python.org/issue5313

I don't see option to assign, so you are on nosy list to start with.

Graham


From mnordhoff at mattnordhoff.com  Thu Feb 19 00:24:34 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 19 Feb 2009 05:24:34 +0000
Subject: Revision Control
In-Reply-To: <499C5521.2040705@tim.thechases.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
	<499C5521.2040705@tim.thechases.com>
Message-ID: <499CED12.3040802@mattnordhoff.com>

Tim Chase wrote:

<snip cvs, svn and git>

>> -Mercurial (this is a big up and coming RCS)
> 
> This is currently my favorite:  good branching/merging, fast, written
> mostly in Python (one C extension module, IIRC), and a simple interface
> 
>> -Bazaar (written in Python. Also pretty new. I don't know about Windows
>> support)
> 
> I like Bazaar (bzr), but the last several times I've tried it, it's been
> a little slow.  This has been steadily improving, and I like their
> emphasis on correctness foremost.  It's a lot like mercurial, but is
> pure python (no C extension module) which makes it nice to deploy into
> environments such as my shared web-hosting service where I can't build
> extension C modules or install packages such as hg/git/svn from the
> repository.

FWIW, Bazaar and Mercurial both have about half a dozen C modules. (Most
of Bazaar's are Pyrex, though, not straight C.)

The next release of Mercurial will add support for running without them.
 (Bazaar already supports that, of course.)

<snip summary>
-- 


From pavlovevidence at gmail.com  Thu Feb 19 00:40:24 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 21:40:24 -0800 (PST)
Subject: Problem--Extending the behavior of an upstream package
Message-ID: <60848752-2c3f-4512-bf61-0bc11c919f99@i20g2000prf.googlegroups.com>

Ok, I think I know I want to do this, but I thought I'd run it by yins
guys

I have a fairly large and complex application with two top-level
packages, which we'll call upstream and mine.  The "upstream" package
isn't really upstream.  I own both packages, but I think of the
upstream package as a third-party library relative to the mine
package.  The mine package contains code specific to the application.

Anyway, the upstream modules provide lots of classes and other
functionality, but I want to extend their behavior in various ways.
Say for instance I have a class called Box defined in the module
upstream.packaging.  In this particular application, it makes sense
for all boxes to have a certain behavior, such as a certain way of
being drawn.  So I define a module called mine.custom_packaging which
defines a subclass of upstream.packaging.Box.  That's straightforward
enough.

The problem comes when a different part of the upstream package also
subclasses or creates a Box.  When an upstream function creates a box,
it creates an upstream.packaging.Box instead of a
mine.custom_packaging.Box, but I'd want it to do the latter.

If this were something that happened only once or twice, it'd be no
big deal, I'd just work around it.  However, it's very common.  The
upstream package is almost a complete application unto itself; it only
needs data and a small amount of top-level code to run.  The sort of
tight internal coupling that exists within the upstream package makes
it a logistical problem to extend it.  And the thing is, I can't think
of a convenient way to do it that's tolerably magical, and I am quite
tolerant of homebrew magic in my code.  A particularly troublesome
situation is when a base class and subclass are defined in the same
module, and I want to customize both.  Even things like disambiguating
nomenclature trip me up.

It isn't just classes, BTW.  Sometimes I want to override functions,
or modify permanent data.

So, how would you approach something like this?

(After a little discussion--or not--I'll post some things I've
considered, including a few approaches I've actually implemented.  But
I don't want to taint everyone's ideas just yet.)


Carl Banks


From justinli79 at gmail.com  Thu Feb 19 00:49:03 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 21:49:03 -0800 (PST)
Subject: Building python with sqlite3
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
	<mailman.180.1234948423.11746.python-list@python.org>
	<1c1605a8-006c-455d-9120-962a61c9082d@x29g2000prf.googlegroups.com>
Message-ID: <b326712f-916e-4201-9d37-2ecd851bf148@m12g2000vbp.googlegroups.com>

On Feb 18, 6:29 pm, Justin Li <justinl... at gmail.com> wrote:
> On Feb 18, 5:13 pm, Christian Heimes <li... at cheimes.de> wrote:
>
> > Justin Li schrieb:
>
> > > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > > make, make install, to importsqlite3leads to ImportError. It looks
> > > like I have to build Python with sqlite. I havesqlite3installed on
> > > my system. How should I build Python with it? I did not find any
> > > options relating withsqlite3of configure and Makefile.
>
> > Do you have the development files installed as well? Run "make" again
> > and look at the list of missing modules.
>
> > Christian
>
> Thanks for your reply, Christian.
>
> And yes, I have. I looked into this. I'm working on a 64bit machine.
> And thesqlite3is 64bit as well. Should I install a 32bitsqlite3? I
> think when I building python, the configure program should detect if
> my system 32bit or 64bit one and look for propersqlite3version.
>
> Is that the problem?
>
> Thanks again,
> Justin


I fixed it. I download sqlite3 from website and install it. As a
result, it works fine now.


From aleksandr.goretoy at gmail.com  Thu Feb 19 01:13:38 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Thu, 19 Feb 2009 00:13:38 -0600
Subject: Python Module for console text formatting?
In-Reply-To: <208530.16726.qm@web7908.mail.in.yahoo.com>
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
	<f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>
	<208530.16726.qm@web7908.mail.in.yahoo.com>
Message-ID: <fa98a9e30902182213l37d6bbf7s714f2d23bf32a0f8@mail.gmail.com>

I created a little script for doing stdout coloring for me a while back.
Maybe this will get you closer to what you are looking for. It's kinda
hackish, but it works.

http://code.google.com/p/python-stdout-colors/

-Alex Goretoy
http://www.goretoy.com



On Wed, Feb 18, 2009 at 10:22 PM, srinivasan srinivas <
sri_annauni at yahoo.co.in> wrote:

> Hi,
> Is it possible to apply more than one formatting to a string?
> For ex: the string 'test' has to be underlined and it should be bold. How
> to do that?
>
> Thanks,
> Srini
>  ------------------------------
> *From:* geremy condra <cto at openmigration.net>
> *To:* python-list at python.org
> *Sent:* Wednesday, 18 February, 2009 10:04:34 AM
> *Subject:* Re: Python Module for console text formatting?
>
> You can insert those codes just like you would any other character. If
> there's enough interest I can whip up a wrapper library for you.
>
> http://www.linux.gr/cgi-bin/man2html?console_codes+4
>
> On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <
> sri_annauni at yahoo.co.in> wrote:
>
>>
>> Hi,
>> Does anyone know any python module other than 'ConsoleFormat0.1.1' used to
>> format text on console?
>> For example, printing bold characters on console.
>>
>> Thanks,
>> Srini
>>
>>
>>      Did you know? You can CHAT without downloading messenger. Go to
>> http://in.webmessenger.yahoo.com/
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> OpenMigration LLC- Open Source solutions for your business. Visit us at
> http://OpenMigration.net <http://openmigration.net/>.
>
> ------------------------------
> Add more friends to your messenger and enjoy! Invite them now.<http://in.rd.yahoo.com/tagline_messenger_6/*http://messenger.yahoo.com/invite/>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From diresu at web.de  Thu Feb 19 01:28:12 2009
From: diresu at web.de (Dietrich Bollmann)
Date: Thu, 19 Feb 2009 15:28:12 +0900
Subject: How to convert between Japanese coding systems?
Message-ID: <1235024892.3981.56.camel@pippi.pippi>

Hi,

Are there any functions in python to convert between different Japanese
coding systems?

I would like to convert between (at least) ISO-2022-JP, UTF-8, EUC-JP
and SJIS.  I also need some function to encode / decode base64 encoded
strings.

I get the strings (which actually are emails) from a server on the
internet with:

  import urllib
  server = urllib.urlopen(serverURL, parameters)
  email = server.read()

The coding systems are given in the response string:

Example:

email = '''[...]
Subject:
=?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
=?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
[...]
Content-Type: text/plain; charset=EUC-JP
[...]
Content-Transfer-Encoding: base64
[...]

cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K

'''

My idea is to first parse the 'email' string and to extract the email
body as well as the values of the 'Subject: ', the 'Content-Type: ' and
the 'Content-Transfer-Encoding: ' attributes and to after use them to
convert them to some other coding system:

Something in the lines of:

  (subject, contentType, contentTransferEncoding, content) =
parseEmail(email)

  to = 'utf-8'
  subjectUtf8 = decodeSubject(subject, to)

  from = contentType
  to = 'utf-8'
  contentUtf8 = convertCodingSystem(decodeBase64(content), from, to)

The only problem is that I could not find any standard functionality to
convert between different Japanese coding systems.

Thanks,

Dietrich Bollmann





From nad at acm.org  Thu Feb 19 02:02:53 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 18 Feb 2009 23:02:53 -0800
Subject: v 3.0 mpkg
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
Message-ID: <nad-6492A8.23025218022009@ger.gmane.org>

In article 
<8c7f10c60902040337q617a37bfr9ec937b38e433fa9 at mail.gmail.com>,
 Simon Brunning <simon at brunningonline.net> wrote:
> 2009/2/4 John Forse <johnforse at talktalk.net>:
> >  Does anyone know if Python v3.0 is available as an .mpkg installer for Mac
> > 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't find any
> > reference to one on the Python.org download site. I've downloaded the Python
> > 3.0 folder but can't follow how to install it without a .mpkg file. Any help
> > would be really appreciated.
> AFAIK there's no Python 3.0 installer for the Mac. You'll have to
> build it yourself - see <http://tinyurl.com/6zkem7>.

Follow up:  Python 3.0.1 has been released and, with it, an installer 
image for OS X:

<http://www.python.org/download/releases/3.0.1/>

-- 
 Ned Deily,
 nad at acm.org



From apt.shansen at gmail.com  Thu Feb 19 02:35:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Wed, 18 Feb 2009 23:35:55 -0800
Subject: v 3.0 mpkg
In-Reply-To: <nad-6492A8.23025218022009@ger.gmane.org>
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
	<nad-6492A8.23025218022009@ger.gmane.org>
Message-ID: <7a9c25c20902182335n226e4496vce023b1627baaf3a@mail.gmail.com>

> Follow up:  Python 3.0.1 has been released and, with it, an installer
> image for OS X:
>
> <http://www.python.org/download/releases/3.0.1/>
>

How doe the 3.0 installer on the mac interact with existing installs?
I have the system install but more importantly the python.org one
which I can't have messed up; will this install just as 'python3'?

I wanna be sure it won't mess anything up on my system, as my company
is still on 2.4 as a standard and barely preparing to move to 2.5 --
we only use it on our macs installs.

Thanks..

--S


From __peter__ at web.de  Thu Feb 19 02:51:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 08:51:03 +0100
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org>
Message-ID: <gnj317$o4e$01$1@news.t-online.com>

Dietrich Bollmann wrote:

> I get the strings (which actually are emails) from a server on the
> internet with:
> 
>   import urllib
>   server = urllib.urlopen(serverURL, parameters)
>   email = server.read()
> 
> The coding systems are given in the response string:
> 
> Example:
> 
> email = '''[...]
> Subject:
> =?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
> =?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
> [...]
> Content-Type: text/plain; charset=EUC-JP
> [...]
> Content-Transfer-Encoding: base64
> [...]
> 
> cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
> 
> '''

Is that an email? Maybe you can get it in a format that is supported by the
email package in the standard library.

> The only problem is that I could not find any standard functionality to
> convert between different Japanese coding systems.

Then you didn't look hard enough:
 
>>> s = "????".decode("utf8") # i have no idea what that means
>>> s.encode("iso-2022-jp")
'\x1b$B2q<R35MW\x1b(B'
>>> s.encode("euc-jp")
'\xb2\xf1\xbc\xd2\xb3\xb5\xcd\xd7'
>>> s.encode("sjis")
'\x89\xef\x8e\xd0\x8aT\x97v'

See also http://www.amk.ca/python/howto/unicode

Peter


From cwitts at gmail.com  Thu Feb 19 03:12:12 2009
From: cwitts at gmail.com (Chris)
Date: Thu, 19 Feb 2009 00:12:12 -0800 (PST)
Subject: Delete lines which contain string in a file
References: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com> 
	<mailman.211.1234995881.11746.python-list@python.org>
Message-ID: <452cd8ba-392f-451d-8f51-f81bd1eb0d8b@j8g2000yql.googlegroups.com>

On Feb 19, 12:24?am, Steve Holden <st... at holdenweb.com> wrote:
> Rudi Goldman wrote:
> > Hi,
> > Go easy on me as I am a new to Python and am trying to solve a practical
> > problem that is driving me bananas.
> > Basically I have 2 text files, a source and a target. I want to be able
> > to delete all of the lines in the target file which contain text from
> > any line in the source file.
> > i.e.
> > Source: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Target:
> > 111 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? xxx 111 yyy ?
> > 222 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? xxx ?333 sss
> > 333 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? jjj ? 444 sss
>
> > After executing this code the target file should only consist of the
> > line: ? ? jjj ? 444 sss
> > Any help on this one would be greatly appreciated.
>
> Is this homework?
>
> How far have you got with your design?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Who needs python for this...

cwitts at cwitts-mint ~ $ cat src.txt
[111,222,333]
cwitts at cwitts-mint ~ $ cat tgt.txt
xxx 111 yyy
xxx  333 sss
jjj   444 sss
cwitts at cwitts-mint ~ $ grep -v -f src.txt tgt.txt
jjj   444 sss


From mail at microcorp.co.za  Thu Feb 19 03:25:28 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 19 Feb 2009 10:25:28 +0200
Subject: PIL install driving me mad! With solution!
References: <c24de59f-bd92-4dcb-bcbe-6563eabea96c@x29g2000prf.googlegroups.com>
Message-ID: <000c01c99270$f0bbc600$0d00a8c0@hendrik>

"bleah" <joh.. at ph...arizona.edu> wrote:


>I'm trying to get PIL 1.16 installed on a SUSE SLES10 system, and
>cannot, for the life of me, get the thing to compile with jpeg
>support.
>
>The libjpeg-devel libraries are installed, and are present in /usr/lib
>JUST WHERE SPECIFIED in the setup.py file, and the jpeglib.h incliude
>file is present  JUST WHERE SPECIFIED in the setup.py file.
>
>The build process proceeds without errors, yet selftest.py fails with
>the error:
>
>tonic:~/html2pdf_sources/Imaging-1.1.6 # python selftest.py
>*****************************************************************
>Failure in example: _info(Image.open("Images/lena.jpg"))

This is the problem.
Lena with the feathered hat is a shy girl,
and she does not allow just anybody 
to look at her.

:-)

- Hendrik



From Lie.1296 at gmail.com  Thu Feb 19 03:29:53 2009
From: Lie.1296 at gmail.com (Lie)
Date: Thu, 19 Feb 2009 00:29:53 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
Message-ID: <fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>

On Feb 18, 8:02?pm, r <rt8... at gmail.com> wrote:
> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design<CITATION NEEDED>. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.

Blender's UI is designed for effective and efficient 3D workflow, not
for low learning curve.



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 19 03:33:56 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 19 Feb 2009 09:33:56 +0100
Subject: Calling a class instance like a function
In-Reply-To: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
Message-ID: <499d1960$0$18734$426a74cc@news.free.fr>

Uberman a ?crit :
> I'm wondering if there's a way to invoke a "function" operator on a Python
> class instance.  For example, given a class instance:
> 
> 	myClass = MyClass()
> 
> I want to call that instance like a function, with an argument value:
> 
> 	myClass(5.0)
> 
> I can override the "()" operator in C++, so I'm wondering if there's a way to
> do it in Python as well.


Filip already answered, but you may want to read this anyway:
http://docs.python.org/reference/datamodel.html#special-method-names

HTH


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 19 03:47:48 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 19 Feb 2009 09:47:48 +0100
Subject: block dynamic attribute creation
In-Reply-To: <hm4nl.271$tw4.14@nwrddc01.gnilink.net>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
Message-ID: <499d1ca1$0$26184$426a74cc@news.free.fr>

Alan G Isaac a ?crit :
> On 2/18/2009 6:15 PM Gabriel Genellina apparently wrote:
>> type(a).x 
> 
> OK, that's good.  I'd like to sometimes lock attribute creation on
> instances of a class but still allow properties to function
> correctly.  Will something like below be satisfactory?
 >
> 
>   def __setattr__(self, attr, val):
>     """If instance locked, allow no new attributes."""
>     try:
>       #get the class attribute if it exists
>       p = getattr(type(self),attr)
>       #if it's a descriptor, use it to set val
>       p.__set__(self, val)
>     except AttributeError: #no descriptor
>       if hasattr(self, attr): #update val
>         self.__dict__[attr] = val
>       elif getattr(self, '_attrlock', False):
>         raise AttributeError(
>         "Set _attrlock to False to add attributes.")
>       else:
>         #new attributes allowed
>         self.__dict__[attr] = val


Might be safer to call on the parent class __setattr__ instead of 
directly assigning to the instance's dict Also, your tests in the except 
clause could be simplified:

       if not hasattr(self, attr) and getattr(self, '_attrlock', False):
         raise AttributeError(yadda yadda)
       # NB: assume newstyle class
       super(YourClass, self).__setattr__(attr, val)


My 2 cents.


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:29 -0200
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
	<87ocwzzvym.fsf@mulj.homelinux.net> <gni9mm$bv0$1@ss408.t-com.hr>
Message-ID: <op.upk6r7nqx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 22:38:45 -0200, SMALLp <pofuk at email.t-com.hr> escribi?:

> Thanks for help!
>
> My problem was actualy:
>>>> a = ["velja\xe8a 2009"]
>>>> print a    #will print
> ["velja\xe8a 2009"]
>>>> Print a[0]    #will print
> velja?a 2009

And why is that a problem?

Almost the only reason to print a list is when debugging a program. To
print a list, Python uses repr() on each of its elements. Otherwise, [5,
"5", u'5'] would be indistinguishable from [5, 5, 5], and you usually want
to know exactly *what* the list contains.

Perhaps if you tell us what do you want to do exactly someone can offer
more advice.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:45 -0200
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>
Message-ID: <op.uplaaqrax6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 23:36:25 -0200, sturlamolden <sturlamolden at yahoo.no>
escribi?:
> On Feb 10, 7:28?am, oyster <lepto.pyt... at gmail.com> wrote:

> Let's rewrite that slightly and see...
>
> def fib(n, _map=None):
>     if not _map: _map = map
>     if n > 2:
>         return sum(_map(fib, (n-1, n-2)))
>     else:
>         return 1
>
>
> With two cores:
>
> E:\>python fibotest.py
> parallel t: 31.300226 seconds
> sequential t: 48.070695 seconds
>
>
> Yes it can!

Are you kidding?
This is like building a house one brick at a time, but before placing a
new brick, you throw all the previous work and start again from start.
Certainly two workers would help more than one - but the best way to do it
is *NOT* to repeat all that additional work over and over in the first
place.
Even my Pentium I MMX 233MHz can compute fib(36) thousand of times faster
than that with the right algorithm. So I don't see the point in
parallelizing if you're going to get infinitely worse results...

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:53 -0200
Subject: block dynamic attribute creation (was: get descriptor from
	instance)
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
Message-ID: <op.uplbq3n5x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 01:29:17 -0200, Alan G Isaac <alan.isaac at gmail.com>
escribi?:

> OK, that's good.  I'd like to sometimes lock attribute creation on
> instances of a class but still allow properties to function
> correctly.  Will something like below be satisfactory?
>
>    def __setattr__(self, attr, val):
>      """If instance locked, allow no new attributes."""
>      try:
>        #get the class attribute if it exists
>        p = getattr(type(self),attr)
>        #if it's a descriptor, use it to set val
>        p.__set__(self, val)
>      except AttributeError: #no descriptor
>        if hasattr(self, attr): #update val
>          self.__dict__[attr] = val
>        elif getattr(self, '_attrlock', False):
>          raise AttributeError(
>          "Set _attrlock to False to add attributes.")
>        else:
>          #new attributes allowed
>          self.__dict__[attr] = val

The problem with using __setattr__ is that is slows down *all* attribute
writes considerably.

In particular, your code prevents using class attributes as a default
value for instance attributes (not a big deal, but I like it sometimes),
and you must remember to set a value for all attributes (even the "hidden"
ones used by any property). But if you feel OK with that, "just do it". I
think there are a few recipes in the Python Cookbook about this topic too.

-- 
Gabriel Genellina



From nad at acm.org  Thu Feb 19 03:58:23 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 00:58:23 -0800
Subject: v 3.0 mpkg
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
	<nad-6492A8.23025218022009@ger.gmane.org>
	<7a9c25c20902182335n226e4496vce023b1627baaf3a@mail.gmail.com>
Message-ID: <nad-1E9864.00582319022009@ger.gmane.org>

In article 
<7a9c25c20902182335n226e4496vce023b1627baaf3a at mail.gmail.com>,
 Stephen Hansen <apt.shansen at gmail.com> wrote:
> > Follow up:  Python 3.0.1 has been released and, with it, an installer
> > image for OS X:
> > <http://www.python.org/download/releases/3.0.1/>
> How doe the 3.0 installer on the mac interact with existing installs?
> I have the system install but more importantly the python.org one
> which I can't have messed up; will this install just as 'python3'?
> 
> I wanna be sure it won't mess anything up on my system, as my company
> is still on 2.4 as a standard and barely preparing to move to 2.5 --
> we only use it on our macs installs.
 
<http://permalink.gmane.org/gmane.comp.python.apple/15546>

-- 
 Ned Deily,
 nad at acm.org



From justin.mailinglists at gmail.com  Thu Feb 19 04:02:01 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 19 Feb 2009 01:02:01 -0800 (PST)
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org>
Message-ID: <9132a12f-8ff5-4a5a-909d-fb322af42936@r3g2000vbp.googlegroups.com>

On Feb 19, 2:28?pm, Dietrich Bollmann <dir... at web.de> wrote:
> Are there any functions in python to convert between different Japanese
> coding systems?
>
> I would like to convert between (at least) ISO-2022-JP, UTF-8, EUC-JP
> and SJIS. ?I also need some function to encode / decode base64 encoded
> strings.
>
> Example:
>
> email = '''[...]
> Subject:
> =?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
> =?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
> [...]
> Content-Type: text/plain; charset=EUC-JP
> [...]
> Content-Transfer-Encoding: base64
> [...]
>
> cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
>
> '''
>
> ? from = contentType
> ? to = 'utf-8'
> ? contentUtf8 = convertCodingSystem(decodeBase64(content), from, to)
>
> The only problem is that I could not find any standard functionality to
> convert between different Japanese coding systems.
>
> Thanks,
>
> Dietrich Bollmann

import base64

ENCODINGS = ['ISO-2022-JP', 'UTF-8', 'EUC-JP', 'SJIS']

def decodeBase64(content):
    return base64.decodestring(content)

def convertCodingSystem(s, _from, _to):
    unicode = s.decode(_from)
    return unicode.encode(_to)

if __name__ == '__main__':
    content = 'cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K'
    _from = 'EUC-JP'
    for _to in ENCODINGS:
        x = convertCodingSystem(decodeBase64(content), _from, _to)
        print _to, repr(x)



From sjmachin at lexicon.net  Thu Feb 19 04:45:03 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 19 Feb 2009 01:45:03 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com> 
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au> 
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com> 
	<mailman.203.1234987578.11746.python-list@python.org>
	<gnhqmf$r2b$00$2@news.t-online.com> 
	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
Message-ID: <84663b82-89f5-4f74-9091-b8fd65b92c5e@b38g2000prf.googlegroups.com>

On Feb 19, 6:47?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__pete... at web.de>
> declaimed the following in comp.lang.python:
>
> > Steve Holden wrote:
>
> > > Jervis Whitley wrote:
> > >>> What happens when you have hundreds of megabytes, I don't know.
>
> > >> I hope I never have to test a word that is hundreds of megabytes long
> > >> for a vowel :)
>
> > > I see you don't speak German ;-)
>
> > I tried to come up with a funny way to point out that you're a fool.
>
> > But because I'm German I failed.
>
> ? ? ? ? Yeah... the proper language to bemoan is Welsh <G>
>
> Where "w" is vowel <G>

Better bemoaned is Czech which can go on and on using only L and R as
"sonorant consonants" instead of vowels.



From gert.cuykens at gmail.com  Thu Feb 19 05:03:21 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 19 Feb 2009 02:03:21 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
	<mailman.222.1235010024.11746.python-list@python.org>
Message-ID: <999bdec3-cf58-4e30-acac-e62d1b8ad340@k19g2000yqg.googlegroups.com>

On Feb 19, 3:20?am, Steve Holden <st... at holdenweb.com> wrote:
> gert wrote:
> > Can you first explain why x stay's 0 please and how i should update x
> > using threads ?
>
> > fromtkinterimport *
> > from _thread import start_new_thread
> > from time import sleep
>
> > x=0
> > def weegbrug(x):
> > ? ? while True:
> > ? ? ? ? x=x+1
> > ? ? ? ? sleep(0.5)
> > start_new_thread(weegbrug,(x,))
>
> > root = Tk()
> > v = StringVar()
> > v.set("00000")
> > txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
> > font=("Helvetica", 300))
> > txt.pack(expand=YES, fill=BOTH)
> > root.title("Weegbrug")
> > root.after(500, lambda:v.set(x))
> > root.mainloop()
>
> The reason x stays at zero has nothing to do withthreading.
>
> The statement
>
> ? ? x=x+1
>
> (which, by the way, should stylistically be written
>
> ? ? x = x + 1
>
> if you want your code to be readable) doesn't change anything outside
> the function. Function arguments are values: since x is a parameter of
> the function, it exists only inside the function call's namespace.
>

Oeps :) Anyway will this x work in tkinter

from _thread import start_new_thread
from time import sleep

x=0
def weegbrug():
    global x
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,())

while True:
    print(x)


From mail at microcorp.co.za  Thu Feb 19 05:08:22 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 19 Feb 2009 12:08:22 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
Message-ID: <009901c9927a$de95e280$0d00a8c0@hendrik>

 "gert" <gert......s at gmail.com> wrote:


>On Feb 18, 8:25 am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
>> "gert" <gert.cuyk... at gmail.com>wrote:
>>
>> > After reading the docs and seeing a few examples i think this should
>> > work ?
>> > Am I forgetting something here or am I doing something stupid ?
>> > Anyway I see my yellow screen, that has to count for something :)
>>
>> > from tkinter import *
>> > from threading import Thread
>>
>> > class Weegbrug(Thread):
>> > def __init__(self,v):
.> > self.v=v
>> > Thread.__init__(self)
>> > def run(self):
>> > while True:
>> > with open('com1','r') as f:
>> > for line in f:
>> > self.v.set(line[2:-1])
>>
>> It is in general not a good idea to directly
>> access GUI variables from outside the
>> GUI main loop.
>> There is a recipe for doing this sort of thing,
>> but as usual I have lost the reference.
>> What it does is that instead of interfering directly
>> as above, you put the data on a queue.
>>
>> Then, you use the after() call to set up a call
>> to a routine that reads the queue, and configures the
>> display, and then uses after again to call itself again
>> after a time, thereby keeping the GUI stuff in the GUI
>> mainloop.
>>
>
>from tkinter import *
>from threading import Thread
>
>class Weegbrug(Thread):
>    def __init__(self):
>        self.display='00000'
>        Thread.__init__(self)
>    def run(self):
>        x=0
>        while True:
>            x=x+1
>            self.display=x

Still mucking around from outside the GUI.

>            #with open('com1','r') as f:
>            #     for l in f:
>            #         self.display=l[2:-1]
>
>root = Tk()
>v = StringVar()
>v.set('00000')
>w = Weegbrug()
>w.start()
>tx = Label(root, textvariable=v, width=800, height=600, bg='yellow',
>font=('Helvetica', 300))
>tx.pack(expand=YES, fill=BOTH)
>root.title('Weegbrug')
>root.overrideredirect(1)
>root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
>root.winfo_screenheight()))
>root.after(500, v.set(w.display))

root.after(500,displayer(q))  # You set up a "stutter thread" like this

>root.mainloop()
>
>Why does this not work ?
>It only shows one result ?

You are only calling it once.
Read my story above again.  (And Again)
Specially the bit about putting the
values into a queue.

You need to do something like this:

def displayer(q):
  # stuff to read the queue and update the display
  root.after(500, displayer(q))        # This makes sure it keeps on stuttering

Where q is an instance of Queue.Queue

There is a nice recipe by Thomas Haeller (?) but I have lost the link.

- Hendrik




From justin.mailinglists at gmail.com  Thu Feb 19 05:12:18 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 19 Feb 2009 02:12:18 -0800 (PST)
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org> 
	<9132a12f-8ff5-4a5a-909d-fb322af42936@r3g2000vbp.googlegroups.com>
Message-ID: <d7369644-d976-45a4-b8e0-eba6fdb80a0c@17g2000vbf.googlegroups.com>

import email
from email.Header import decode_header
from unicodedata import name as un

MS = '''\
Subject: =?UTF-8?Q?
romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
Date: Thu, 19 Feb 2009 09:34:56 -0000
MIME-Version: 1.0
Content-Type: text/plain; charset=EUC-JP
Content-Transfer-Encoding: base64

cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
'''

def get_header(msg, name):
    (value, charset), = decode_header(msg.get(name))
    if not charset: return value
    return value.decode(charset)

if __name__ == '__main__':
    msg = email.message_from_string(MS)
    s = get_header(msg, 'Subject')
    print repr(s)
    for c in s:
        try: print un(c)
        except ValueError: print repr(c)
    print

    e = msg.get_content_charset()
    b = msg.get_payload(decode=True).decode(e)
    print repr(b)
    for c in b:
        try: print un(c)
        except ValueError: print repr(c)
    print


From oswald.harry at gmail.com  Thu Feb 19 05:21:51 2009
From: oswald.harry at gmail.com (harryos)
Date: Thu, 19 Feb 2009 02:21:51 -0800 (PST)
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
	<4-6dndjITMU90wHUnZ2dnUVZ_qvinZ2d@pdx.net>
Message-ID: <abbaed9c-f80a-41f8-b102-e093b0706b67@s9g2000prg.googlegroups.com>

On Feb 18, 11:10?pm, Scott David Daniels <Scott.Dani... at Acm.Org>
> Are you running F:\Python25\python.exe (or F:\Python25\pythonw.exe)?
> open a command window (run cmd), and type:
> ? ? ?C:\> python
> ? ? ?...
> ? ? ?>>> import sys
> ? ? ?>>> for dirname in ?sys.path:
> ? ? ? ? ? ? ?print sys.path
>
> I suspect something you see printed will surprise you.
> Either the banner, identifying a Python version you were
> not expecting, or perhaps a bunch of C:-based directories.
> If this does not help you decipher the problem, try running
> ? ? ? python -v
> Python verbose mode (You will get a _lot_ of output).
> Then, when you (finally) get a ">>>" prompt, type:
> ? ? >>> import pygame
> and you will see eaxctly what lookups are tried.


thanks Scott for the detailed reply..
I reinstalled python and pygame and now things are working..:-)
thanks  again
harry


From rubik_wizard at NO.SPAMhotmail.com  Thu Feb 19 05:33:30 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Thu, 19 Feb 2009 10:33:30 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d@bt.com>
Message-ID: <0bCdnXbPLcAYqADUnZ2dnUVZ8i2WnZ2d@bt.com>

Hi

It turns out I should have used

t=turtle.Pen()

and not

t=turtle.pen()

My stupid mistake!

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d at bt.com...
> Thanks everyone!
>
> It appears the info in the book is wrong. Trying what you have all 
> suggested
> has got it to work!
>
> Many thanks, and I am sure I will be back here again with other newbie
> problems!
>
> Neil
>
> "Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
> news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
>> Hello
>>
>> Sorry if this is not an appropriate newsgroup for this problem. I am very 
>> new to Python but not new to programming.
>>
>> I am hoping to use Python to teach a class and have been looking at the 
>> online book 'Snake Wrangling for Kids'.
>>
>> I have followed the example
>>
>>>>>import turtle
>>>>>t=turtle.pen()
>>
>> which works fine and displays a turtle in a window.
>>
>> However whenever I try to use something like
>>
>>>>>t.forward(50)   (taken from the book)
>>
>> i get the error...
>>
>> Traceback (most recent call last):
>>  File "<pyshell#3>", line 1, in <module>
>>    t.forward(50)
>> AttributeError: 'dict' object has no attribute 'forward'
>>
>> I get the same error with t.left(10) etc. etc.
>>
>> I have tried this with V2.6 and V3
>>
>> Any ideas would be much appreciated.
>>
>> Thanks
>> Neil
>>
>>
>>
>
> 




From slafs.e at gmail.com  Thu Feb 19 05:53:56 2009
From: slafs.e at gmail.com (Slafs)
Date: Thu, 19 Feb 2009 02:53:56 -0800 (PST)
Subject: cx Oracle privileges
Message-ID: <1f0cae7c-d842-488c-a37e-cc4d799360e5@t11g2000yqg.googlegroups.com>

Hello

On my Debian server I'm using cx Oracle 5.1 (installation from a
package made from rpm by alien) with Python 2.5.2
and Oracle Instant Client 10.2.0.4.0. Installation went well but
simple test such as connecting to the db shows that only user root can
make a connection to a database, but any other user can't do this
becuse
>>> import cx_Oracle
>>> connection = cx_Oracle.Connection('user/pass at 1.2.3.4/dbsid')
hangs :/

I've checked privileges to instant client and cx_Oracle.so in site-
packages and they are fine.

Did anyone came across with similar problem or maybe can show me where
I should look for the cause?

Thanks in advance.


From http  Thu Feb 19 05:57:34 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 02:57:34 -0800
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>
	<mailman.233.1235034305.11746.python-list@python.org>
Message-ID: <7x1vtuiti9.fsf@ruckus.brouhaha.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:
> Even my Pentium I MMX 233MHz can compute fib(36) thousand of times faster
> than that with the right algorithm. So I don't see the point in
> parallelizing if you're going to get infinitely worse results...

The point is to test the parallelization scheme.  Recursive fibonacci
is a standard benchmark for this sort of thing.  Sturlamolden's test
may be inspired by a recent similar GHC test:

   http://donsbot.wordpress.com/2007/11/29/


From rushenaly at gmail.com  Thu Feb 19 06:36:13 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 03:36:13 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
Message-ID: <6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>

Thank you for all your answers...

I think i am going to pick Java instead of Python...

Rushen



From cdsd at d.com  Thu Feb 19 06:39:45 2009
From: cdsd at d.com (ssd)
Date: Thu, 19 Feb 2009 12:39:45 +0100
Subject: py test
Message-ID: <gnji5q$pih$2@aioe.org>

test

b 




From jeff.dyke at gmail.com  Thu Feb 19 07:10:35 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Thu, 19 Feb 2009 07:10:35 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
Message-ID: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>

Fair enough.  Say my project is called foo, and it has many
submodules.  So there are imports that may look like `import foo.bar`
or `from foo.bar import baz`, if i change the top level directory, it
is no longer foo and then those imports do not work as originally
written.  The way i currently do this  is to create a branch, say
foo2, and create a symbolic link named foo pointing at foo2, after
renaming foo, when i want to work on the branch and remove the link
when i want to work on the head.  This actually works fine, but
thought there may be a better way.

Jeff

On Wed, Feb 18, 2009 at 7:40 PM, andrew cooke <andrew at acooke.org> wrote:
>
> maybe this is just me, but i don't have a clue what your problem is.  what
> does "starting imports all over the place" mean?  what do you mean by
> "retired"?
>
> i use svn with python in exactly the same way as with java (and, i
> thought, in the same way as anyone uses svn with any language; java uses
> the directory structure as a package structure too).
>
> maybe someone else will reply, but if not it might help to explain a
> little more detail.
>
> andrew
>
>
> Jeff Dyke wrote:
>> Hello.  I am curious about different ideas on how you handle branching
>> your python projects.  With some other languages this is trivial, but
>> since python uses these directories as modules and i have the top
>> level module starting imports all over the place, i am wondering what
>> others do.  In the past we had retired the first branch and just moved
>> towards the new, but that is not possible now.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From andrew at acooke.org  Thu Feb 19 07:20:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 09:20:05 -0300 (CLST)
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
Message-ID: <dc429c9d793a09ff7d27bbbd0d6aa4bb.squirrel@acooke.dyndns.org>


Ah, OK.  I have never worked like that.  The only helpful comment I can
think of is that I believe svn will store links correctly (while CVS
doesn't).

However, I do find the whole approach a bit odd.  You seem to be doing
your own versioning "by hand" (having two packages that are equivalent
with different names), where I would leave that to SVN/CVS.  So what I
would do, and what seems to me a more natural way to use version control,
is to branch the entire project (the whole tree), leave the foo module
name the same, and work on two separate projects.  If changes (ie on
modules other than foo) need to be made to both projects I would use
svnmerge to make sure that merges made to one also apply to the other. 
But if that is a common situation then it suggests the other modules might
be better treated as a separate library, with their own project.

On the other hand, svnmerge is a bit of a pain and I can see how your
approach might make more sense (particularly on smaller projects).

Andrew


Jeff Dyke wrote:
> Fair enough.  Say my project is called foo, and it has many
> submodules.  So there are imports that may look like `import foo.bar`
> or `from foo.bar import baz`, if i change the top level directory, it
> is no longer foo and then those imports do not work as originally
> written.  The way i currently do this  is to create a branch, say
> foo2, and create a symbolic link named foo pointing at foo2, after
> renaming foo, when i want to work on the branch and remove the link
> when i want to work on the head.  This actually works fine, but
> thought there may be a better way.
>
> Jeff
>
> On Wed, Feb 18, 2009 at 7:40 PM, andrew cooke <andrew at acooke.org> wrote:
>>
>> maybe this is just me, but i don't have a clue what your problem is.
>> what
>> does "starting imports all over the place" mean?  what do you mean by
>> "retired"?
>>
>> i use svn with python in exactly the same way as with java (and, i
>> thought, in the same way as anyone uses svn with any language; java uses
>> the directory structure as a package structure too).
>>
>> maybe someone else will reply, but if not it might help to explain a
>> little more detail.
>>
>> andrew
>>
>>
>> Jeff Dyke wrote:
>>> Hello.  I am curious about different ideas on how you handle branching
>>> your python projects.  With some other languages this is trivial, but
>>> since python uses these directories as modules and i have the top
>>> level module starting imports all over the place, i am wondering what
>>> others do.  In the past we had retired the first branch and just moved
>>> towards the new, but that is not possible now.
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From google at mrabarnett.plus.com  Thu Feb 19 07:39:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 12:39:42 +0000
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>	<mailman.203.1234987578.11746.python-list@python.org>	<gnhqmf$r2b$00$2@news.t-online.com>
	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
Message-ID: <499D530E.4090702@mrabarnett.plus.com>

Dennis Lee Bieber wrote:
> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__peter__ at web.de>
> declaimed the following in comp.lang.python:
> 
>> Steve Holden wrote:
>>
>>> Jervis Whitley wrote:
>>>>> What happens when you have hundreds of megabytes, I don't know.
>>>>>
>>>>>
>>>> I hope I never have to test a word that is hundreds of megabytes long
>>>> for a vowel :)
>>> I see you don't speak German ;-)
>> I tried to come up with a funny way to point out that you're a fool.
>>
>> But because I'm German I failed.
>>
> 	Yeah... the proper language to bemoan is Welsh <G> 
> 
> Where "w" is vowel <G>
> 
So is "y", but then it is in English too, sometimes.


From johnforse at talktalk.net  Thu Feb 19 07:46:52 2009
From: johnforse at talktalk.net (John Forse)
Date: Thu, 19 Feb 2009 12:46:52 +0000
Subject: string to list conversion
Message-ID: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>

I need to convert an input string say 'xxxx' to a list of the form  
['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ;  
list.join() is an error;  and str.join() won't use lists. I do need  
the comma after the string. Is there a simple solution?
Regards
John





From urbangabo at gmail.com  Thu Feb 19 07:50:23 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Thu, 19 Feb 2009 13:50:23 +0100
Subject: Porting to new Python version
Message-ID: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>

Hi,

I have a tough issue: we are using a Python application written quite
a time ago for version 2.4. The code is mature, and there are no bugs.
 My bosses came up with the idea to port it to the latest release... I
am not really convinced that it's a good step.

I wellcome any information pro and contra. I would like to get the
background as precisely as possible.

Thanks in advance and good day to You!

Gabor


From xng at xs4all.nl  Thu Feb 19 07:50:57 2009
From: xng at xs4all.nl (Martin P. Hellwig)
Date: Thu, 19 Feb 2009 12:50:57 +0000
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <mailman.237.1235047183.11746.python-list@python.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>	<mailman.203.1234987578.11746.python-list@python.org>	<gnhqmf$r2b$00$2@news.t-online.com>	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
	<mailman.237.1235047183.11746.python-list@python.org>
Message-ID: <499d55b1$0$188$e4fe514c@news.xs4all.nl>

MRAB wrote:
> Dennis Lee Bieber wrote:
>> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__peter__ at web.de>
>> declaimed the following in comp.lang.python:
>>
>>> Steve Holden wrote:
>>>
>>>> Jervis Whitley wrote:
>>>>>> What happens when you have hundreds of megabytes, I don't know.
>>>>>>
>>>>>>
>>>>> I hope I never have to test a word that is hundreds of megabytes long
>>>>> for a vowel :)
>>>> I see you don't speak German ;-)
>>> I tried to come up with a funny way to point out that you're a fool.
>>>
>>> But because I'm German I failed.
>>>
>>     Yeah... the proper language to bemoan is Welsh <G>
>> Where "w" is vowel <G>
>>
> So is "y", but then it is in English too, sometimes.

Heh, born and raised in Germany, moved to the Netherlands and now live 
in the UK, speak a bit of French too. No wonder the only language that 
makes actually sense to me is Python.

-- 
mph


From KGeraghty at 360i.com  Thu Feb 19 07:55:37 2009
From: KGeraghty at 360i.com (Kevin Geraghty)
Date: Thu, 19 Feb 2009 07:55:37 -0500
Subject: Creating a request for ZSI 
Message-ID: <C30921E026F4C44EA3333D1B41CA623CC6172EF3BA@IIEXCHMAIN.innovationinteractive.com>

Folks,
I am trying to access a WSDL and I used wsdl2py to create the needed files. My problem is that when I try to create a request object I get a request Holder object instead.

>>> get_rates_by_profile_name=ns0.get_rates_by_profile_name_Dec().pyclass
>>> req=get_rates_by_profile_name()
>>> req._username = username
>>> req._org_id = org_id
>>> req._profile_name = profile_name
>>> req
<HotelWebService_services_types.get_rates_by_profile_name_Holder object at 0xb7c04d8c>

When I try to get a response the isinstance() test rejects the request holder object as being of the wrong type.

>>> resp = portType.get_rates_by_profile_name(req)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "HotelWebService_services.py", line 487, in get_rates_by_profile_name
    raise TypeError, "%s incorrect request type" % (request.__class__)
TypeError: <class 'HotelWebService_services_types.get_rates_by_profile_name_Holder'> incorrect request type

How do I get a req object that ZSI will let me use to get a response?

Thanks
Kevin


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From dstanek at dstanek.com  Thu Feb 19 07:57:37 2009
From: dstanek at dstanek.com (David Stanek)
Date: Thu, 19 Feb 2009 07:57:37 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
Message-ID: <de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:10 AM, Jeff Dyke <jeff.dyke at gmail.com> wrote:
> Fair enough.  Say my project is called foo, and it has many
> submodules.  So there are imports that may look like `import foo.bar`
> or `from foo.bar import baz`, if i change the top level directory, it
> is no longer foo and then those imports do not work as originally
> written.  The way i currently do this  is to create a branch, say
> foo2, and create a symbolic link named foo pointing at foo2, after
> renaming foo, when i want to work on the branch and remove the link
> when i want to work on the head.  This actually works fine, but
> thought there may be a better way.
>
> Jeff
>

I think that your project structure is faulty. In Subversion I do
something like:

* FooProject/trunk/foo
* FooProject/branches/TRY-foo2

TRY-foo2 is an svn cp of trunk so checking out TRY-foo2 gives you a
TRY-foo2 directory containing a foo package. My DVCS projects go
essentially the same thing.


-- 
David
http://www.traceback.org


From oliverpeng at gmail.com  Thu Feb 19 07:57:46 2009
From: oliverpeng at gmail.com (O Peng)
Date: Thu, 19 Feb 2009 04:57:46 -0800 (PST)
Subject: urllib2 httplib.BadStatusLine exception while opening a page on 
	an Oracle HTTP Server
References: <728a06bb-2faa-4a61-b988-ff3d9809aa28@w39g2000prb.googlegroups.com>
	<cea443cd-f2d3-4fb9-83ef-c903122d13ca@l33g2000pri.googlegroups.com>
Message-ID: <54eb2670-6636-41a4-9a6a-d2ba7b3fa158@m29g2000prd.googlegroups.com>

I'm running into a similar problem with the BadStatusLine.
The source code for httplib.py in the problem is as follows:

class HTTPResponse:
    ...
    def _read_status(self):
        line = self.fp.readline()
        ...
        if not line:
            # Presumably, the server closed the connection before
            # sending a valid response.
            raise BadStatusLine(line)

However, I found that right before the 'raise BadStatusLine(line)'
when I ran the following:

restOfResponse = self.fp.read()
print restOfResponse

restOfResponse is NOT empty.  In fact, when I run self.fp.read() at
the beginning of the begin() function, it is not empty at all.
This leads me to believe there is a bug with the self.fp.readline()
(socket._fileobject.readline()) function.  For me it only fails
sometimes.

This behavior is only observed on Windows, Python 2.5.  Running it on
Mac OS X, Python 2.5 yielded no problems.

On Jan 19, 3:48?pm, ak <akte... at gmail.com> wrote:
> On Jan 19, 10:00?pm, ak <akte... at gmail.com> wrote:
>
>
>
> > Hi everyone,
>
> > I have a problem with urllib2 on this particular url, hosted on an
> > Oracle HTTP Server
>
> >http://www.orange.sk/eshop/sk/portal/catalog.html?type=post&subtype=p...
>
> > which gets 302 redirected tohttps://www.orange.sk/eshop/sk/catalog/post/phones.html,
> > after setting a cookie through the Set-Cookie header field in the 302
> > reply. This works fin with firefox.
>
> > However, with urllib2 and the following code snippet, it doesn't work
>
> > --------
> > import cookiejar
> > import urllib2
>
> > cookiejar = cookielib.LWPCookieJar()
> > opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookiejar))
> > url = 'http://www.orange.sk/eshop/sk/portal/catalog.html?
> > type=post&subtype=phone&null'
> > req = urllib2.Request(url, None)
> > s=opener.open(req)
> > --------
>
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > ? File "/usr/lib/python2.5/urllib2.py", line 387, in open
> > ? ? response = meth(req, response)
> > ? File "/usr/lib/python2.5/urllib2.py", line 498, in http_response
> > ? ? 'http', request, response, code, msg, hdrs)
> > ? File "/usr/lib/python2.5/urllib2.py", line 419, in error
> > ? ? result = self._call_chain(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> > ? ? result = func(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 582, in http_error_302
> > ? ? return self.parent.open(new)
> > ? File "/usr/lib/python2.5/urllib2.py", line 381, in open
> > ? ? response = self._open(req, data)
> > ? File "/usr/lib/python2.5/urllib2.py", line 399, in _open
> > ? ? '_open', req)
> > ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> > ? ? result = func(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 1115, in https_open
> > ? ? return self.do_open(httplib.HTTPSConnection, req)
> > ? File "/usr/lib/python2.5/urllib2.py", line 1080, in do_open
> > ? ? r = h.getresponse()
> > ? File "/usr/lib/python2.5/httplib.py", line 928, in getresponse
> > ? ? response.begin()
> > ? File "/usr/lib/python2.5/httplib.py", line 385, in begin
> > ? ? version, status, reason = self._read_status()
> > ? File "/usr/lib/python2.5/httplib.py", line 349, in _read_status
> > ? ? raise BadStatusLine(line)
> > httplib.BadStatusLine
>
> > Trying the redirected url directly doesn't work either (trying with
> > Firefox will give an HTML error page, as the cookie is not set yet,
> > but trying with urllib2 gives the same exception as previously,
> > whereas it should return the HTML error page)
> > This works correctly on other urls on this website (http(s)://www.orange.sk).
>
> > Am I doing anything wrong or is this a bug in urllib2 ?
>
> > -- ak
>
> Actually, I was wrong on the last point, this does *not* work onhttps://www.orange.sk(but does onhttp://www.orange.sk). IMHO, this
> means either urllib2 or the server misimplemented HTTPS.
>
> Here's some output with debuglevel=1 :
>
> >>> opener.open(urllib2.Request('http://www.orange.sk/', None, headers))
>
> reply: 'HTTP/1.1 200 OK\r\n'
> header: Date: Mon, 19 Jan 2009 21:44:03 GMT
> header: Server: Oracle-Application-Server-10g/10.1.3.1.0 Oracle-HTTP-
> Server
> header: Set-Cookie:
> JSESSIONID=0a19055a30d630c427bda71d4e26a37ca604b9f590dc.e3eNaNiRah4Pe3aSch8 Sc3yOc40;
> path=/web
> header: Expires: Mon, 19 Jan 2009 21:44:13 GMT
> header: Surrogate-Control: max-age="10"
> header: Content-Type: text/html; charset=ISO-8859-2
> header: X-Cache: MISS fromwww.orange.sk
> header: Connection: close
> header: Transfer-Encoding: chunked
> <addinfourl at 137417292 whose fp = <socket._fileobject object at
> 0x831348c>>
>
> >>> opener.open(urllib2.Request('https://www.orange.sk/', None, headers))
>
> reply: ''
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "/usr/lib/python2.5/urllib2.py", line 381, in open
> ? ? response = self._open(req, data)
> ? File "/usr/lib/python2.5/urllib2.py", line 399, in _open
> ? ? '_open', req)
> ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> ? ? result = func(*args)
> ? File "/usr/lib/python2.5/urllib2.py", line 1115, in https_open
> ? ? return self.do_open(httplib.HTTPSConnection, req)
> ? File "/usr/lib/python2.5/urllib2.py", line 1080, in do_open
> ? ? r = h.getresponse()
> ? File "/usr/lib/python2.5/httplib.py", line 928, in getresponse
> ? ? response.begin()
> ? File "/usr/lib/python2.5/httplib.py", line 385, in begin
> ? ? version, status, reason = self._read_status()
> ? File "/usr/lib/python2.5/httplib.py", line 349, in _read_status
> ? ? raise BadStatusLine(line)
> httplib.BadStatusLine
>
> As you can see the reply from the server seems empty (which results in
> the BadStatusLine exception)
>
> Any help greatly appreciated.
>
> -- ak



From steve at holdenweb.com  Thu Feb 19 07:57:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 07:57:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
Message-ID: <gnjl0m$uoj$1@ger.gmane.org>

rushenaly at gmail.com wrote:
> Thank you for all your answers...
> 
> I think i am going to pick Java instead of Python...
> 
Well, good luck. See what a helpful bunch of people you meet in the
Python world? Glad you found all the advice helpful. Come back when you
want to try Python!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Ron.Barak at lsi.com  Thu Feb 19 08:01:07 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 19 Feb 2009 13:01:07 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <mailman.36.1235041220.11040.python-list@python.org>
References: <mailman.36.1235041220.11040.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>

Hi,

I have a class derived from two parents (in blue below), which gives me the following error:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 291, in <module>
    class ListControl(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
Googling suggested I should add

from noconflict import classmaker
and

__metaclass__=classmaker()
to this class.

However, I don't seem able to find where to get the noconflict module from.

Do any of you where noconflict  could be downloaded/installed from ?

Thanks,
Ron.

P.S.: I use Windows XP/cygwin, Python 2.5.2, wx-2.8-msw-unicode
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From Srinivas.Irigi at adaptit.co.za  Thu Feb 19 08:03:51 2009
From: Srinivas.Irigi at adaptit.co.za (Srinivas)
Date: Thu, 19 Feb 2009 15:03:51 +0200
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <200902191503.51851.Srinivas.Irigi@adaptit.co.za>

John,

Try the following code .. hope this helps and solves your problem . I have run 
in the interactive mode
>>> s='xxxx'
>>> a=[s,'12']
>>> print a
['xxxx', '12']


regards
Srinivas




From jeff.dyke at gmail.com  Thu Feb 19 08:05:00 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Thu, 19 Feb 2009 08:05:00 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
	<de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>
Message-ID: <8496caf30902190505i4ff0b990pe8ca5fa13491dce5@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:57 AM, David Stanek <dstanek at dstanek.com> wrote:
> On Thu, Feb 19, 2009 at 7:10 AM, Jeff Dyke <jeff.dyke at gmail.com> wrote:
>> Fair enough.  Say my project is called foo, and it has many
>> submodules.  So there are imports that may look like `import foo.bar`
>> or `from foo.bar import baz`, if i change the top level directory, it
>> is no longer foo and then those imports do not work as originally
>> written.  The way i currently do this  is to create a branch, say
>> foo2, and create a symbolic link named foo pointing at foo2, after
>> renaming foo, when i want to work on the branch and remove the link
>> when i want to work on the head.  This actually works fine, but
>> thought there may be a better way.
>>
>> Jeff
>>
>
> I think that your project structure is faulty. In Subversion I do
> something like:
>
> * FooProject/trunk/foo
> * FooProject/branches/TRY-foo2
>
> TRY-foo2 is an svn cp of trunk so checking out TRY-foo2 gives you a
> TRY-foo2 directory containing a foo package. My DVCS projects go
> essentially the same thing.

I think your correct.  I picked up this habit from someone else and
blindly kept going.

Thanks to both you and Andrew for the comments.  I think i'll work on
making a switch.

>
>
> --
> David
> http://www.traceback.org
>


From n.kottiyath at gmail.com  Thu Feb 19 08:05:39 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Thu, 19 Feb 2009 05:05:39 -0800 (PST)
Subject: Porting to new Python version
References: <mailman.239.1235047827.11746.python-list@python.org>
Message-ID: <67b23877-3292-4c99-83e5-244f29b76e58@k36g2000pri.googlegroups.com>

On Feb 19, 5:50?pm, Gabor Urban <urbang... at gmail.com> wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
> ?My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor

It might be helpful if you can provide more information regarding your
application.
For example, does it use lot of 3rd party code, What is the reason
behind porting to latest version etc.
All said, 2.4 to 2.5 or even 2.6 should not be much of an issue - it
even has the advantage that performance is improved and some memory
leaks are no longer there.
Python 3* should be a problem since many 3rd party applications are
not yet ported to it.


From steve at holdenweb.com  Thu Feb 19 08:07:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 08:07:51 -0500
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <gnjlj6$1ga$1@ger.gmane.org>

John Forse wrote:
> I need to convert an input string say 'xxxx' to a list of the form
> ['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ;
> list.join() is an error;  and str.join() won't use lists. I do need the
> comma after the string. Is there a simple solution?

Suppose your input string is s. Just say

s = [s]

Bingo, s is now a list containing the input string as its only element.
But I suspect that's not what you mean ... because you say "I do need
the comma after the string". Do you mean that you want to produce a
string containing "['xxxx', ]"?

You might try

s = "['%s', ]" % s

But that's potentially going to give you problems if s contains either
an apostrophe or a quote mark. It depends how you plan to use it. So
what is it you want, exactly, and (if it's not asking too much) why?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb 19 08:09:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 13:09:53 +0000
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <499D5A21.9000308@mrabarnett.plus.com>

John Forse wrote:
> I need to convert an input string say 'xxxx' to a list of the form 
> ['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ; 
> list.join() is an error;  and str.join() won't use lists. I do need the 
> comma after the string. Is there a simple solution?
> 
Have you tried [stringname], eg ['xxxx' ,]? :-)

Why do you need the comma? Python permits it but it isn't necessary:

 >>> ['xxxx' ,]
['xxxx']


From steve at holdenweb.com  Thu Feb 19 08:10:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 08:10:02 -0500
Subject: Porting to new Python version
In-Reply-To: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
Message-ID: <gnjln9$1ga$2@ger.gmane.org>

Gabor Urban wrote:
> Hi,
> 
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
>  My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
> 
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
> 
> Thanks in advance and good day to You!
> 
As long as you don't plan to migrate to 3.0 you may well be surprised at
how easy the port is. Python's backwards compatibility has been pretty
good. Moving to 3.0 will demand more thought and testing.

One might ask what the advantages are supposed to be, of course, but
generally bosses aren't interested in explaining themselves ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Thu Feb 19 08:12:36 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 10:12:36 -0300 (CLST)
Subject: Porting to new Python version
In-Reply-To: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
Message-ID: <0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>


i don't know what the context is, so it's hard for me to comment on the
decision (i assume there are commerical pressures like customers not
wanting to install old versions).

however,if you go ahead, you need to think about exactly what you want to
target.

the latest version is really 3.0.1.  moving to 3 is probably not that hard
(and there are tools to automate the process).  also, 2.6 is largely
compatible with 3.  so moving to something that works with 2.6 and 3 is
probably a reasonable target.  but that code will not work, without more
significant effort, on 2.5 and earlier.

so one idea would be to keep your existing code for 2.4, and update for 3.
 for some time (years) you will need to support two versions, but if it is
stable then that may not be much work.

alternatively, you could ignore 3, which is not going to be mainstream for
some time, and simply run against 2.6 and 2.5.  that should be even less
work because you're staying with 2.  you could then say that your code
works on 2.4 through 2.6

or, finally, you could do the second step above (to get code that works on
2.4 to 2.6) and then the first step (to get a separate version that works
on 3).  doing things in that order (with staged releases) lets you get
most bug fixes for 2.5/6 into the code before branching for 3.

hope that makes sense.

disclaimer - i have not done the above; this is from reading various
newsgroups and attempting to backport a project written in 3 to 2 (it was
easy to go to 2.6, but i failed to get the same code to run on 2.5).

andrew





Gabor Urban wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
>  My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From andrew at acooke.org  Thu Feb 19 08:20:16 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 10:20:16 -0300 (CLST)
Subject: Porting to new Python version
In-Reply-To: <0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
	<0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>
Message-ID: <f9993b7d9d9b8a77d5149a4450ad1e61.squirrel@localhost>


maybe i should clarify that "easy" below is going to be relative.  the
process may end up being very hard due to various other reasons.  what i
was trying to explain is that

(1) 3 is probably going to require a separate branch from 2;

(2) that 2.6 and 3 can both be considered "latest";

(3) moving from 2.4 to 2.6 is probably best done before branching for 3;

(4) moving from 2.4 to 2.6 is probably easier than moving from 2 to 3.

andrew


andrew cooke wrote:
>
> i don't know what the context is, so it's hard for me to comment on the
> decision (i assume there are commerical pressures like customers not
> wanting to install old versions).
>
> however,if you go ahead, you need to think about exactly what you want to
> target.
>
> the latest version is really 3.0.1.  moving to 3 is probably not that hard
> (and there are tools to automate the process).  also, 2.6 is largely
> compatible with 3.  so moving to something that works with 2.6 and 3 is
> probably a reasonable target.  but that code will not work, without more
> significant effort, on 2.5 and earlier.
>
> so one idea would be to keep your existing code for 2.4, and update for 3.
>  for some time (years) you will need to support two versions, but if it is
> stable then that may not be much work.
>
> alternatively, you could ignore 3, which is not going to be mainstream for
> some time, and simply run against 2.6 and 2.5.  that should be even less
> work because you're staying with 2.  you could then say that your code
> works on 2.4 through 2.6
>
> or, finally, you could do the second step above (to get code that works on
> 2.4 to 2.6) and then the first step (to get a separate version that works
> on 3).  doing things in that order (with staged releases) lets you get
> most bug fixes for 2.5/6 into the code before branching for 3.
>
> hope that makes sense.
>
> disclaimer - i have not done the above; this is from reading various
> newsgroups and attempting to backport a project written in 3 to 2 (it was
> easy to go to 2.6, but i failed to get the same code to run on 2.5).
>
> andrew
>
>
>
>
>
> Gabor Urban wrote:
>> Hi,
>>
>> I have a tough issue: we are using a Python application written quite
>> a time ago for version 2.4. The code is mature, and there are no bugs.
>>  My bosses came up with the idea to port it to the latest release... I
>> am not really convinced that it's a good step.
>>
>> I wellcome any information pro and contra. I would like to get the
>> background as precisely as possible.
>>
>> Thanks in advance and good day to You!
>>
>> Gabor
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From dikkie at nospam.org  Thu Feb 19 08:30:53 2009
From: dikkie at nospam.org (Dikkie Dik)
Date: Thu, 19 Feb 2009 14:30:53 +0100
Subject: Revision Control
In-Reply-To: <mailman.198.1234977129.11746.python-list@python.org>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
Message-ID: <499d5f0e$0$444$bf4948fe@news.tele2.nl>

Funny how everybody is speaking about the ease of merging. It is the
very least feature I have ever needed from source code control. Most
version control system are really brilliant in creating a version mess
of intertwined branches, but off course I use version control to
*PREVENT* such a mess. So I really would like better linking
possibilities to other projects or standard libraries. That said:

- MS-Source-Safe did a great job here. But I stopped using it after
version 6.0. The linking feature of VSS was great, but the stability of
VSS was awful.

- CVS is a hell. Only administrators seem to be able to create a link.

- Linking is subversion is not exactly user-friendly, but it "kinda"
works. See
http://www.howtoforge.org/set-up-a-modular-svn-repository-for-php-websites
for how I managed to do so with PHP. I don't have a real Python library
yet, but I would use it the same way. Also, the latest subversion should
support relative links.

- I have no experience with mercurial.

- I searched through the documentation of git and bzr, and could not
find much.

If anyone has more info on linking with Mercurial, bzr or git, please
share it!


From lie.1296 at gmail.com  Thu Feb 19 08:42:42 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 19 Feb 2009 13:42:42 +0000 (UTC)
Subject: How to convert between Japanese coding systems?
References: <1235024892.3981.56.camel@pippi.pippi>
Message-ID: <gnjnkh$9o1$1@ger.gmane.org>

On Thu, 19 Feb 2009 15:28:12 +0900, Dietrich Bollmann wrote:

> Hi,
> 
> Are there any functions in python to convert between different Japanese
> coding systems?

If I'm not mistaken, the email standard specifies that only 7-bit ASCII-
encoded bytes can be transported safely and reliably. The highest bit may 
be stripped by email server or client. Thus, to transport non-ASCII data 
safely, they cannot use "regular" encodings (e.g. utf-8, shift-jis, etc). 
I'm not sure what the standard is for Japanese character, but it seems 
that from reading the email header, the encoding used is a modified 
UTF-8. Try checking python's email module, they might have something for 
decoding 7-bit email-utf to 8-bit regular-utf or unicode string.

After decoding the email-utf to regular-utf or unicode string, converting 
to other encoding should be trivial.



From Scott.Daniels at Acm.Org  Thu Feb 19 09:10:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 06:10:54 -0800
Subject: Revision Control
In-Reply-To: <499d5f0e$0$444$bf4948fe@news.tele2.nl>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
	<499d5f0e$0$444$bf4948fe@news.tele2.nl>
Message-ID: <L4-dnd0UBNZ9-gDUnZ2dnUVZ_szinZ2d@pdx.net>

Dikkie Dik wrote:
> Funny how everybody is speaking about the ease of merging. It is the
> very least feature I have ever needed from source code control....

Ah yes, but with a distributed VCS, merging becomes _much_ more common.
The model is developers pull, develop (checking in frequently), and
merge back.  Most checkins to the central repository _are_ merges.
That is why everyone talks about merge speed.

--Scott David Daniels
Scott.Daniels at Acm.Org



From mrkafk at gmail.com  Thu Feb 19 09:21:14 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 19 Feb 2009 15:21:14 +0100
Subject: CSV readers and UTF-8 files
Message-ID: <gnjpss$hae$1@ger.gmane.org>

Hello everyone,

Is it just me or CSV reader/DictReader and UTF-8 files do not work 
correctly in Python 2.6.1 (Windows)?

That is, when I open UTF-8 file in a csv reader (after passing plain 
file object), I get fields as plain strings ('str'). Since this has been 
mangled, I can't get the non-ascii characters back.

When I do:

     csvfo = codecs.open(csvfname, 'rb', 'utf-8')
     dl = csv.excel
     dl.delimiter=';'
     #rd = csv.DictReader(csvfo, dialect=dl)
     rd = csv.reader(csvfo, dialect=dl)

..I get plain strings as well (I get <type 'str'> when calling 
type(field)), on top of error:

Traceback (most recent call last):
   File "C:/Python26/converter3.py", line 99, in <module>
     fill_sqla(session,columnlist,rd)
   File "C:/Python26/converter3.py", line 73, in fill_sqla
     for row in rd:
UnicodeEncodeError: 'ascii' codec can't encode character u'\u0144' in 
position 74: ordinal not in range(128)

..when doing:

     for row in rd:
...

Regards,
mk



From notvalid2 at sbcglobal.net  Thu Feb 19 09:22:21 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 06:22:21 -0800
Subject: Which Version of wxPython for Win XP
Message-ID: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>

I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi 
version is the choice for me. The other choice has unicode. Do I care?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From python.list at tim.thechases.com  Thu Feb 19 09:28:53 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 19 Feb 2009 08:28:53 -0600
Subject: Revision Control
In-Reply-To: <499CED12.3040802@mattnordhoff.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
	<499C5521.2040705@tim.thechases.com>
	<499CED12.3040802@mattnordhoff.com>
Message-ID: <499D6CA5.3000802@tim.thechases.com>

> FWIW, Bazaar and Mercurial both have about half a dozen C modules. (Most
> of Bazaar's are Pyrex, though, not straight C.)

Thanks for the update -- it's been about 6 months since I played 
much with Bazaar.  Hopefully these C module help with some of the 
speed issues that plagued bzr in my past experimentations.

> The next release of Mercurial will add support for running without them.
>  (Bazaar already supports that, of course.)

Wonderful to hear...I'd love to be able to install mercurial on 
my web-host's machine, but it's currently not readily possible. 
A pure-python implementation (or at least fallback) will give me 
this option.

Thanks!

-tkc





From michele.simionato at gmail.com  Thu Feb 19 09:32:04 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 19 Feb 2009 06:32:04 -0800 (PST)
Subject: Porting to new Python version
References: <mailman.239.1235047827.11746.python-list@python.org>
Message-ID: <72aa7a5e-195d-45c1-923f-30a2b049f45b@n30g2000vba.googlegroups.com>

On Feb 19, 1:50?pm, Gabor Urban <urbang... at gmail.com> wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
> ?My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor

I am a fan of smooth upgrades. Just move to Python 2.5 and you should
have little troubles.
You can wait one year or so for Python 2.6. As a rule of thumb, I
think it is safe to upgrade to a newer Python versions after one year
from its first release, to give time to third party packages. There
are of course exceptions. For instance I remember Zope being far
behind Python releases. I have currently a Zope application running in
Python 2.4 that I cannot upgrade. It all depends from your external
dependencies. If you do not have any, and you do not anticipate the
need for any, you can probably upgrade to Python 2.6 with no effort.

 Michele Simionato


From claird at lairds.us  Thu Feb 19 09:33:02 2009
From: claird at lairds.us (Cameron Laird)
Date: Thu, 19 Feb 2009 14:33:02 +0000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
	<39uq66-b7j.ln1@lairds.us>
	<pan.2009.02.18.07.24.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <u57076-llp.ln1@lairds.us>

In article <pan.2009.02.18.07.24.36 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>> 			.
>> 			.
>> 			.
>>>> And now for my version (which admitedly isn't really mine, and returns
>>>> slightly incorrect fib(n) for large values of n, due to the limited
>>>> floating point precision).
>>>
>>>The floating point version is nice, but it starts giving incorrect
>>>answers relatively early, from n=71. But if you don't need accurate
>>>results (a relative error of 3e-15 for n=71), it is very fast.
>> 			.
>> 			.
>> 			.
>> While my personal opinion is that it's silly to characterize an error of
>> 3e-15 as not "accurate", 
>
>That's a *relative* error. The absolute error is 1 for n=71, 59 for n=80, 
>1196093 for n=100, and 1875662300654090482610609259 for n=200. As far as 
>I can tell, the absolute error grows without bounds as n increases -- and 
>it overflows at n=1475.
>
>I agree that a relative error is small, and if your use allows it, then 
>by all means use the inexact floating point function. But if you need 
>exact results, then you won't get it using floats.
>
>
>
>> I think more constructive is to focus on the
>> fact that the closed-form solution can be touched up to give a precise
>> integral solution, while re- taining its (approximately) O(log n)
>> run-time cost.
>
>I doubt that. Since both phi and sqrt(5) are irrational numbers, it would 
>require an infinite number of integer digits to get precise integral 
>solutions unless there was some sort of freakish cancellation. But you 
>probably could get a very good integral solution which gives exact 
>results up to whatever limit you wanted, bound only by the amount of 
>memory and time you were willing to spend.
			.
			.
			.
There *is* freakish cancellation.

I entirely recognize that Python builds in floating-point
calculations of limited precision.  The closed-form expres-
sion for Fibonacci, though, is exact, and can be coded in
terms of, for example, Python infinite-precision integers.
If there's sufficient interest, I'll cheerfully do so, al-
though only after meeting my own deadlines for February
for commitments outside comp.lang.python.


From fabiofz at gmail.com  Thu Feb 19 09:38:45 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 19 Feb 2009 11:38:45 -0300
Subject: Why deepcopy with class with __getattr__ makes the tracing go nuts?
Message-ID: <cfb578b20902190638x57dba665l9cc80a98496747c7@mail.gmail.com>

Anyone has any idea why the code attached does not work?

Basically, after doing the deepcopy of the class that has __getattr__
overridden, the python tracing facilities don't seem to work anymore.

In the code-attached, if the deepcopy is removed, all works as
expected (or if __deepcopy__ is overridden too).

Thanks,

Fabio

p.s. I've discovered this while trying to debug a real-world
application and the debugger stopped working after making that
deepcopy.
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From roy at panix.com  Thu Feb 19 09:57:05 2009
From: roy at panix.com (Roy Smith)
Date: Thu, 19 Feb 2009 09:57:05 -0500
Subject: Revision Control
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
	<499d5f0e$0$444$bf4948fe@news.tele2.nl>
Message-ID: <roy-168A45.09570519022009@news.panix.com>

In article <499d5f0e$0$444$bf4948fe at news.tele2.nl>,
 Dikkie Dik <dikkie at nospam.org> wrote:

> Funny how everybody is speaking about the ease of merging. It is the
> very least feature I have ever needed from source code control. 

It depends on what you're doing.  In a big commercial project, sometimes 
you don't have the luxury of just continuing to work on the latest.  You 
have to maintain multiple branches.  When big customers refuse to upgrade, 
you're stuck with maintaining old stuff, and then good merge tools become 
essential.


From alan.isaac at gmail.com  Thu Feb 19 10:20:25 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 15:20:25 GMT
Subject: block dynamic attribute creation
In-Reply-To: <mailman.232.1235034007.11746.python-list@python.org>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>	<mailman.217.1234998934.11746.python-list@python.org>	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<mailman.232.1235034007.11746.python-list@python.org>
Message-ID: <ZMenl.405$Ez6.355@nwrddc02.gnilink.net>

>>        if hasattr(self, attr): #update val
>>          self.__dict__[attr] = val


On 2/19/2009 3:54 AM Gabriel Genellina apparently wrote:
> In particular, your code prevents using class attributes as a default
> value for instance attributes

Doesn't the above allow that?

Thanks,
Alan


From james at agentultra.com  Thu Feb 19 10:28:52 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 19 Feb 2009 07:28:52 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <mailman.207.1234992848.11746.python-list@python.org>
Message-ID: <87zlgitphn.fsf@agentultra.com>

Cameron Simpson <cs at zip.com.au> writes:

> On 17Feb2009 15:12, J Kenneth King <james at agentultra.com> wrote:
> | I recently started a project called TracShell
> | (http://code.google.com/p/tracshell) where I make heavy use of the
> | xmlrpclib core module.
> | 
> | When the number of RPC calls was small, wrapping each call in try/except
> | was acceptable. [...]
> | To combat the duplication, my clever idea was to use a function
> | decorator to wrap any function that used xmlrpclib calls:
> | def catch_errors(fn):
> [...]
> | Maybe I could rename the decorator to something meaningful, but besides
> | that it works pretty well. Now any function I write in my class that
> | uses RPC calls can be wrapped by this decorator and have the exception
> | handling done in a uniform way for these particular exceptions.
>
> My Python fu is still weak, but I had a similar issue last year and
> wrote a context manager, used thus:
>
>   with NoExceptions(handler):
>       ... do stuff that may break ...
>
> The constructor takes a handleException argument (which may be None, but it
> has to be explicit) to tune which exceptions are caught; default is
> everything. This was for a daemon thread that did RPC calls, so it was
> actually fairly important to never die; normally you'd want to catch only
> specific exceptions.
>
> Code:
>
>   class NoExceptions(object):
>       ''' A context manager to catch _all_ exceptions and log them.
>           Arguably this should be a bare try...except but that's syntacticly
>           noisy and separates the catch from the top.
>       '''
>
>       def __init__(self, handleException):
>           ''' Initialise the NoExceptions context manager.
>               The handleException is a callable which
>               expects (exc_type, exc_value, traceback)
>               and returns True or False for the __exit__
>               method of the manager.
>               If handleException is None, the __exit__ method
>               always returns True, suppressing any exception.
>           '''
>           self.__handler = handleException
>
>       def __enter__(self):
>           pass
>
>       def __exit__(self, exc_type, exc_value, traceback):
>           if self.__handler is not None:
>               return self.__handler(exc_type, exc_value, traceback)
>           if exc_type is not None:
>               print >>sys.stderr, "ignore %s" % (exc_type,)
>           return True
>
> It doesn't actually solve your duplication issue and is a bit of a niche
> application, but it's a lot shorter than an inline try/except and to my eye
> reads a little better, and it keeps the exception handling up front at the
> calling end where it is visible.
>
> Cheers,

Ah, that's pretty interesting. I've found a couple other decorator-style
recipes in the cookbooks online (http://code.activestate.com/recipes/408937/).

I think you see my point: every single RPC call needs to be caught just
in case because they are so volatile -- yet you're always looking for
the exact same exception everywhere... too noisy to have inline
try/except. I wonder if there are other use cases where Python
developers have found the need to abstract away repetitive exception
handling.

I think this is the first I've seen the newer Python context managers
being used (though it sneakily looks a lot like what Lisp calls,
"unwind-protect"). Neat idea.


From rushenaly at gmail.com  Thu Feb 19 10:39:01 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 07:39:01 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
Message-ID: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>

Thank you Steve,

I really wanted to learn python, but as i said i don't want to make a
dead investment. I hope someone can fix these design errors and maybe
can write an interpreter in python :)

Thank you so much great community...
Rushen


From __peter__ at web.de  Thu Feb 19 10:39:42 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 16:39:42 +0100
Subject: Why deepcopy with class with __getattr__ makes the tracing go
	nuts?
References: <mailman.254.1235054333.11746.python-list@python.org>
Message-ID: <gnjufq$rij$03$1@news.t-online.com>

Fabio Zadrozny wrote:

> Anyone has any idea why the code attached does not work?
> 
> Basically, after doing the deepcopy of the class that has __getattr__
> overridden, the python tracing facilities don't seem to work anymore.
> 
> In the code-attached, if the deepcopy is removed, all works as
> expected (or if __deepcopy__ is overridden too).
> 
> Thanks,
> 
> Fabio
> 
> p.s. I've discovered this while trying to debug a real-world
> application and the debugger stopped working after making that
> deepcopy.

The problem seems to be a recursion error that implicitly switches off
tracing:

$ cat trace_test.py
import sys

def blowup():
    blowup()

def f():
    print "f called"

def trace(frame, event, arg):
    try:
        if frame.f_code.co_name == 'f':
            print "f seen", event
    finally:
        return trace

sys.settrace(trace)

if "-b" in sys.argv:
    try:
        blowup()
    except:
        pass

f()

$ python trace_test.py
f seen call
f seen line
f called
f seen return

$ python trace_test.py -b
f called

deepcopy() probably triggers such a recursion by accessing the type_name
attribute on a CppType instance with an empty __dict__. You can fix that
with

    def __getattr__(self, attr):
        if attr == 'type_name':
            return super(CppType, self).__getattr__(attr)
        # ...

I don't know why the exception is caught silently, nor how to make tracing
survive the stack overflow.

Peter


From digitig at gmail.com  Thu Feb 19 10:59:36 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 15:59:36 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <aee48b3c0902190759h1eea144pa8ba90c0a92690f8@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Thank you Steve,
>
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Good luck with Java, and with your search for a perfect language. I
think it will be a long search.

-- 
Tim Rowe


From Eric_Dexter at msn.com  Thu Feb 19 11:03:13 2009
From: Eric_Dexter at msn.com (Eric_Dexter at msn.com)
Date: Thu, 19 Feb 2009 08:03:13 -0800 (PST)
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
Message-ID: <b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>

On Feb 19, 8:22?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
> version is the choice for me. The other choice has unicode. Do I care?
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>


There is a good chance you don't care...  I think the other is for
internationalization...  best to look..  It would be easier to answer
the question if you said what you are going to do with it, and who
needed to use your software.  It's even possible that you might want
to try pygame depending on what you want to use it for and who the
audience is (and how good thier computers are)

http://pypi.python.org/simple/Dex%20Tracker/


From lists at cheimes.de  Thu Feb 19 11:08:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 19 Feb 2009 17:08:32 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <gnk060$c3r$1@ger.gmane.org>

rushenaly at gmail.com schrieb:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Good luck with Java! You have just traded one "design flaw" for another,
more fatal design error. Please read this paper from a Berkely professor
for CS why people think that threads are evil and not the right solution
for concurrency on multi core systems.
http://www.eecs.berkeley.edu/Pubs/TechRpts/2006/EECS-2006-1.pdf

Quote:
[...] non-trivial multi-threaded programs are incomprehensible for humans.

HTH
Christian



From rushenaly at gmail.com  Thu Feb 19 11:10:56 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 08:10:56 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.256.1235059179.11746.python-list@python.org>
Message-ID: <cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>

Thank you Tim...

It is not a search for perfect language. It is a search for a capable
language to modern worlds' needs.

Rushen


From garrickp at gmail.com  Thu Feb 19 11:11:16 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 08:11:16 -0800 (PST)
Subject: CSV readers and UTF-8 files
References: <mailman.252.1235053288.11746.python-list@python.org>
Message-ID: <59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>

On Feb 19, 7:21?am, mk <mrk... at gmail.com> wrote:
> Hello everyone,
>
> Is it just me or CSV reader/DictReader and UTF-8 files do not work
> correctly in Python 2.6.1 (Windows)?

I would point out in the CSV module documentation (http://
docs.python.org/library/csv.html) it explicitly mentions that it can't
handle unicode.

You can use their workaround in the examples section for UTF-8, or
with another form of encoding (I used MIME) for UTF-16.

~G


From Eric_Dexter at netzero.net  Thu Feb 19 11:13:39 2009
From: Eric_Dexter at netzero.net (Eric_Dexter at netzero.net)
Date: Thu, 19 Feb 2009 08:13:39 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com> 
	<8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com> 
	<1198ef28-b2c0-4464-85ad-31798dc0c33f@r15g2000prh.googlegroups.com>
Message-ID: <a60a29d2-5ff0-4153-a2dd-7606b71a553f@n2g2000vba.googlegroups.com>

On Feb 18, 5:12?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 3:03?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > > > post here and hope someone new the answer. I feel it's a silly
> > > > problem, maybe something to do with a path variable? The problem: I've
> > > > downloaded the "all-in-one" windows binary installer for PyGTK from
> > > > their website. After typing in their first tutorial program and trying
> > > > to run from the command line, I get:
>
> > > > "This application has failed to start because libglib-2.0-0.dll was
> > > > not found" error dialog.
>
> > > > The traceback indicates this is happening at the "import gtk" line. A
> > > > quick search of my install directory for PyGTK indicates that the file
> > > > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > > > Is there some some sort of path variable for Python I need to modify
> > > > and, if so, how is this done? Thanks so much, and my apologies if this
> > > > is the wrong forum.
>
> > > > -L
>
> > > Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> > > different traceback error:
>
> > > "ImportError: no module named pygtk"
>
> > > I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> > > Then I displaye the sys.path:
>
> > > IDLE 1.2>>> import sys
> > > >>> sys.path
>
> > > ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> > > \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> > > \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> > > \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> > > \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> > > \\Python\\lib\\site-packages']
>
> > > Every single entry is related to PyGTK and nothing else. Something
> > > seems wrong here but I don't have enough Python experience to know
> > > just what. Anyone?- Hide quoted text -
>
> > > - Show quoted text -
>
> > Okay, out of desperation and frustration I've wiped my Python/SciPy/
> > etc.. setup and reinstalled from scratch. I've tested it with my app
> > and all the numpy and matplotlib functionality is there and working.
> > My sys.path seems to be back to normal:
>
> > IDLE 1.2.4>>> import sys
> > >>> sys.path
>
> > ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> > 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> > win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> > \site-packages']
>
> > I will now re-install PyGTK and see if it mysteriously decides to work
> > this time.- Hide quoted text -
>
> > - Show quoted text -
>
> Nope. Now I'm getting:
>
> "The applciation has failed to start because MSVCR80.dll was not
> found."
>
> Don't know what else to try here. Anyone have any ideas?- Hide quoted text -
>
> - Show quoted text -

you can try downloading an older version...  I haven't updated mine
for over a year.  I am using the version that goes with python 2.5 and
windows (I perfer to try wxwindows first usualy..) and it seems to
work o.k. ....  I don't know if that will help or not..


From tim.wintle at teamrubber.com  Thu Feb 19 11:37:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 16:37:49 +0000
Subject: os.fdopen giving "Invalid Argument" from pipes
Message-ID: <1235061469.22757.33.camel@tim-laptop>

Was wondering if someone could point out what the stupid thing I'm doing
wrong is:


{{{
import os, time
def run_multi_proc():
    server_send, logger_recieve = os.pipe()
    pid = os.fork()
    if pid == 0:
        # we are the logger
        #os.close(server_send)
        logger_recieve = os.fdopen(logger_recieve)
        time.sleep(20)
    else:
        # we are the server
        #os.close(logger_recieve)
        server_send = os.fdopen(server_send,"w")
        time.sleep(3)
        os.kill(pid,signal.SIGTERM)

if __name__ == "__main__":
    run_multi_proc()
}}}


> python test.py

Traceback (most recent call last):
  File "test.py", line 20, in <module>
    run_multi_proc()
  File "test.py", line 9, in run_multi_proc
    logger_recieve = os.fdopen(logger_recieve)
OSError: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "test.py", line 20, in <module>
    run_multi_proc()
  File "test.py", line 15, in run_multi_proc
    server_send = os.fdopen(server_send,"w")
OSError: [Errno 22] Invalid argument


really confused about why this isn't working - running on Linux with
python 2.5.2

Tim W



From notvalid2 at sbcglobal.net  Thu Feb 19 11:38:07 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 08:38:07 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
Message-ID: <0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>

Eric_Dexter at msn.com wrote:
> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>> version is the choice for me. The other choice has unicode. Do I care?
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> 
> There is a good chance you don't care...  I think the other is for
> internationalization...  best to look..  It would be easier to answer
> the question if you said what you are going to do with it, and who
> needed to use your software.  It's even possible that you might want
> to try pygame depending on what you want to use it for and who the
> audience is (and how good thier computers are)
> 
> http://pypi.python.org/simple/Dex%20Tracker/
Thanks. I think I'll take the chance. Somewhat simple programming.
Off I go to install it. It can always be un-installed.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From digitig at gmail.com  Thu Feb 19 11:48:52 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 16:48:52 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.256.1235059179.11746.python-list@python.org>
	<cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>
Message-ID: <aee48b3c0902190848m2eee1e0fgbac0884ba279627@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Thank you Tim...
>
> It is not a search for perfect language. It is a search for a capable
> language to modern worlds' needs.

That would be just about any of the ones you mentioned, then. Unless
you mean the needs of a specific project, in which case the
suitability will depend on the project.

-- 
Tim Rowe


From exarkun at divmod.com  Thu Feb 19 11:50:04 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 19 Feb 2009 11:50:04 -0500
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <1235061469.22757.33.camel@tim-laptop>
Message-ID: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>

On Thu, 19 Feb 2009 16:37:49 +0000, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>Was wondering if someone could point out what the stupid thing I'm doing
>wrong is:
>
>
>{{{
>import os, time
>def run_multi_proc():
>    server_send, logger_recieve = os.pipe()

You got server_send and logger_receive backwards (also, i before e *except* after c et cetera).  Flip 'em around and all is well.

>    pid = os.fork()
>    if pid == 0:
>        # we are the logger
>        #os.close(server_send)
>        logger_recieve = os.fdopen(logger_recieve)
>        time.sleep(20)
>    else:
>        # we are the server
>        #os.close(logger_recieve)
>        server_send = os.fdopen(server_send,"w")
>        time.sleep(3)
>        os.kill(pid,signal.SIGTERM)
>
>if __name__ == "__main__":
>    run_multi_proc()
>}}}
>
>
>> python test.py
>
>Traceback (most recent call last):
>  File "test.py", line 20, in <module>
>    run_multi_proc()
>  File "test.py", line 9, in run_multi_proc
>    logger_recieve = os.fdopen(logger_recieve)
>OSError: [Errno 22] Invalid argument
>Traceback (most recent call last):
>  File "test.py", line 20, in <module>
>    run_multi_proc()
>  File "test.py", line 15, in run_multi_proc
>    server_send = os.fdopen(server_send,"w")
>OSError: [Errno 22] Invalid argument
>
>
>really confused about why this isn't working - running on Linux with
>python 2.5.2

Jean-Paul


From tim.wintle at teamrubber.com  Thu Feb 19 11:53:25 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 16:53:25 +0000
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
References: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
Message-ID: <1235062405.22757.35.camel@tim-laptop>

On Thu, 2009-02-19 at 11:50 -0500, Jean-Paul Calderone wrote:
> You got server_send and logger_receive backwards 

Doh!

> (also, i before e *except* after c et cetera).  Flip 'em around and
> all is well.

Thanks - never was great at speling :-)

Tim



From sturlamolden at yahoo.no  Thu Feb 19 11:55:00 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Thu, 19 Feb 2009 08:55:00 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>

On Feb 19, 4:39?pm, rushen... at gmail.com wrote:

> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Java and Python has different strengths and weaknesses. There is no
such thing as "the perfect language". It all depends on what you want
to do.

Just be aware that scientists and engineers who need parallel
computers do not use Java or C#. A combination of a scripting language
with C or Fortran seems to be preferred. Popular scripting languages
numerical computing include Python, R, IDL, Perl, and Matlab.

You will find that in the Java community, threads are generally used
for other tasks than parallel computing, and mainly asynchronous I/O.
Java does not have a GIL, nor does Jython or Microsoft's IronPython.
But if you use threads for I/O, the GIL does not matter. Having more
than one CPU does not make your harddisk or network connection any
faster. The GIL does not matter before crunching numbers on the CPU
becomes the bottleneck. And when you finally get there, perhaps it is
time to look into some C programming? Those that complain about
CPython's GIL (or the GIL of Perl/PHP/Ruby for that matter) seem to be
developers who have no or little experience with parallel computers.
Yes, the GIL prevents Python threads from being used in a certain way.
But do you really need to use threads like that? Or do you just think
you do?

S.M.


From R.Brodie at rl.ac.uk  Thu Feb 19 12:07:33 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 19 Feb 2009 17:07:33 -0000
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
Message-ID: <gnk3km$e9b$1@south.jnrs.ja.net>


"sturlamolden" <sturlamolden at yahoo.no> wrote in message 
news:d544d846-15ac-446e-a77f-cede8fcf9f27 at m40g2000yqh.googlegroups.com...

> The GIL does not matter before crunching numbers on the CPU
> becomes the bottleneck. And when you finally get there, perhaps it is
> time to look into some C programming?

Or numpy on a 512 core GPGPU processor, because using the CPU
for crunching numbers is just *so* dated. ;) 




From Tribulations at Paralleles.invalid  Thu Feb 19 12:15:15 2009
From: Tribulations at Paralleles.invalid (TP)
Date: Thu, 19 Feb 2009 18:15:15 +0100
Subject: setattr question
Message-ID: <3mg076-fl5.ln1@rama.fbx.proxad.net>

Hi everybody,

I try to make a "link" (or shortcut, if you want) so that len(b_instance)
computes in fact len(a) (see the code below). I could write a method
__len__ to b, but I wonder if it is possible to make it with a
setattr/getattr trick, as I do below.

Thanks in advance,

Julien

######################
class b( object ):

    def __init__( self ):

        super( b, self ).__init__()

a = [5,4,7]
b_instance = b()

setattr( b_instance, "__len__", getattr( a, "__len__") )
print len( a )
print id( a.__len__ )
print hasattr( b_instance, "__len__" )
print id( b.__len__ )
print len( b_instance )
########################

I obtain:
$ p test_setattr.py
3
3083822540
True
Traceback (most recent call last):
  File "test_setattr.py", line 14, in <module>
    print id( b.__len__ )
AttributeError: type object 'b' has no attribute '__len__'
        Command failure: error 1 !


-- 
python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\
9&1+,\'Z4(55l4('])"

"When a distinguished but elderly scientist states that something is
possible, he is almost certainly right. When he states that something is
impossible, he is very probably wrong." (first law of AC Clarke)


From amgusarov at gmail.com  Thu Feb 19 12:17:56 2009
From: amgusarov at gmail.com (Alex Gusarov)
Date: Thu, 19 Feb 2009 23:17:56 +0600
Subject: Search in list of dictionaries
Message-ID: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>

 Hello everybody!

I've a list of dictionaries with 'shorcut' and 'command' keys. When user
types a word program must search this list for a typed shortcut and then run
linked command. What I've wrote:

        for cmd in self.commands:
            if cmd['shortcut'] == input:
                os.popen(cmd['command'])
                break
        else:
            os.popen(input)

But it's a brute-force method and I think there is another way in searching
items through a list by dictionary key. Please give me advice how can I
implement fast search in list of dictionaries by some dictionary key. In my
mind language:

list.get({'shortcut' == input})

Thanks a lot, Alex
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From hellyj at ucsd.edu  Thu Feb 19 12:28:42 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 09:28:42 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>
Message-ID: <3BD0C017-E443-4E46-9BFE-3B399686CB5D@ucsd.edu>

Hi Miles.
Same result from that as well.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 17, 2009, at 2:43 PM, Miles wrote:

On Mon, Feb 16, 2009 at 8:35 PM, Helly John J. wrote:
> However, when I run python and try to import gdal, this is what  
> happens:
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import gdal
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named gdal

What about "from osgeo import gdal"?

-Miles
--
http://mail.python.org/mailman/listinfo/python-list



From notvalid2 at sbcglobal.net  Thu Feb 19 12:29:22 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 09:29:22 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
Message-ID: <Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>

W. eWatson wrote:
> Eric_Dexter at msn.com wrote:
>> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>>> version is the choice for me. The other choice has unicode. Do I care?
>>> -- 
>>>                                 W. eWatson
>>>
>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>
>>>                      Web Page: <www.speckledwithstars.net/>
>>
>>
>> There is a good chance you don't care...  I think the other is for
>> internationalization...  best to look..  It would be easier to answer
>> the question if you said what you are going to do with it, and who
>> needed to use your software.  It's even possible that you might want
>> to try pygame depending on what you want to use it for and who the
>> audience is (and how good thier computers are)
>>
>> http://pypi.python.org/simple/Dex%20Tracker/
> Thanks. I think I'll take the chance. Somewhat simple programming.
> Off I go to install it. It can always be un-installed.
> 
Well, that was an interesting experience. It appears to have recompiled a 
lot of stuff, and probably some libraries. IDLE is still with me as the way 
to open py files. Apparently, if I want to get around IDLE, I may have to 
install some other editor.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From hellyj at ucsd.edu  Thu Feb 19 12:30:29 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 09:30:29 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
Message-ID: <F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>

Hi Philip.
I installed the 2.5.4 binary from the python.org site.  I did this  
because NumPy and SciPy currently only work with 2.5 and the system  
version was 2.4.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 17, 2009, at 12:30 PM, Philip Semanchuk wrote:


On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:

> Hi.
>
> I'm a newbie to python and am running:
>
> OS X 10.5.6
> Python 2.5.4

Hi John,
Are you using the system Python or have you installed another version?

Cheers
Philip




>
>
> and have run easy_install for gdal like this:
>
> /Library/Python/2.5/site-packages>sudo easy_install GDAL
> Password:
> Searching for GDAL
> Best match: GDAL 1.6.0
> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> GDAL 1.6.0 is already the active version in easy-install.pth
>
> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> i386.egg
> Processing dependencies for GDAL
> Finished processing dependencies for GDAL
>
> However, when I run python and try to import gdal, this is what  
> happens:
>
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import gdal
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ImportError: No module named gdal
> >>>
>
> Clearly, it's not being found but I don't understand how to debug  
> this any further.  I have the *.egg in the site-packages directory  
> but don't understand if there is something else I have to do to make  
> it usable.  Any help would be much appreciated.
> Cheers.
> --------------
> John Helly, University of California, San Diego
> San Diego Supercomputer Center,  Mail Code 0527
> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
> and Physical Oceanography, Mail Code 0224
> 9500 Gilman Dr., La Jolla CA 92093
> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
> URL (http://www.sdsc.edu/~hellyj)
>
> --
> http://mail.python.org/mailman/listinfo/python-list

--
http://mail.python.org/mailman/listinfo/python-list



From lionel.keene at gmail.com  Thu Feb 19 12:34:43 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 09:34:43 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com>
Message-ID: <e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com>

On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > Thanks Carl, I like your solution. Am I correct in my understanding
> > that memory is allocated at the slicing step in your example i.e. when
> > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > is constructed that memmaps the entire file. Some relatively small
> > amount of memory is allocated for the memmap operation, but the bulk
> > memory allocation occurs when I generate my final numpy sub-array by
> > slicing, and this accounts for the memory efficiency of using memmap?
>
> No, what accounts for the memory efficienty is there is no bulk
> allocation at all. ?The ndarray you have points to the memory that's
> in the mmap. ?There is no copying data or separate array allocation.
>
> Also, it's not any more memory efficient to use the offset parameter
> with numpy.memmap than it is to memmap the whole file and take a
> slice.
>
> Carl Banks

Does this mean that everytime I iterate through an ndarray that is
sourced from a memmap, the data is read from the disc? The sliced
array is at no time wholly resident in memory? What are the
performance implications of this?


From __peter__ at web.de  Thu Feb 19 12:38:46 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 18:38:46 +0100
Subject: setattr question
References: <3mg076-fl5.ln1@rama.fbx.proxad.net>
Message-ID: <gnk5f2$qir$01$1@news.t-online.com>

TP wrote:

> Hi everybody,
> 
> I try to make a "link" (or shortcut, if you want) so that len(b_instance)
> computes in fact len(a) (see the code below). I could write a method
> __len__ to b, but I wonder if it is possible to make it with a
> setattr/getattr trick, as I do below.
> 
> Thanks in advance,
> 
> Julien
> 
> ######################
> class b( object ):
> 
>     def __init__( self ):
> 
>         super( b, self ).__init__()
> 
> a = [5,4,7]
> b_instance = b()
> 
> setattr( b_instance, "__len__", getattr( a, "__len__") )

Invoking setattr() or getattr() with a constant name is bogus. The above can
be written as

b_instance.__len__ = a.__len__

> print len( a )
> print id( a.__len__ )
> print hasattr( b_instance, "__len__" )
> print id( b.__len__ )
> print len( b_instance )
> ########################
> 
> I obtain:
> $ p test_setattr.py
> 3
> 3083822540
> True
> Traceback (most recent call last):
>   File "test_setattr.py", line 14, in <module>
>     print id( b.__len__ )
> AttributeError: type object 'b' has no attribute '__len__'
>         Command failure: error 1 !
> 

__special__ methods in newstyle classes are looked up in the class, not the
instance: 

>>> class B(object): pass
...
>>> items = [1,2,3]
>>> b = B()
>>> len(b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object of type 'B' has no len()
>>> B.__len__ = items.__len__
>>> len(b)
3

Now that doesn't make much sense because all instances of B now share the
same length. If you want a useful per-instance length function you have to
delegate:

>>> class B(object):
...     def __len__(self): return self._len()
...
>>> a = B()
>>> b = B()
>>> a._len = [1,2,3].__len__
>>> b._len = [].__len__
>>> len(a), len(b)
(3, 0)

Peter



From google at mrabarnett.plus.com  Thu Feb 19 12:39:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 17:39:04 +0000
Subject: Search in list of dictionaries
In-Reply-To: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
References: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
Message-ID: <499D9938.5010207@mrabarnett.plus.com>

Alex Gusarov wrote:
> Hello everybody!
> 
> I've a list of dictionaries with 'shorcut' and 'command' keys. When user 
> types a word program must search this list for a typed shortcut and then 
> run linked command. What I've wrote:
> 
>         for cmd in self.commands:
>             if cmd['shortcut'] == input:
>                 os.popen(cmd['command'])
>                 break
>         else:
>             os.popen(input)
> 
> But it's a brute-force method and I think there is another way in 
> searching items through a list by dictionary key. Please give me advice 
> how can I implement fast search in list of dictionaries by some 
> dictionary key. In my mind language:
> 
> list.get({'shortcut' == input})
> 
If want to go from the shortcut to the command (cmd['shortcut'] ->
cmd['command']) the quickest way is using a dict, where cmd['shortcut']
is the key and cmd['command'] is the value:

     self.command_dict = {}
     for cmd in self.commands:
         self.command_dict[cmd['shortcut']] = cmd['command']

and then:

     os.popen(self.command_dict[input])

This will raise a KeyError if it's unknown. The equivalent of your code
above is:

     os.popen(self.command_dict.get(input, input))


From pavlovevidence at gmail.com  Thu Feb 19 12:51:57 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 09:51:57 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com>
Message-ID: <10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com>

On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > that memory is allocated at the slicing step in your example i.e. when
> > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > is constructed that memmaps the entire file. Some relatively small
> > > amount of memory is allocated for the memmap operation, but the bulk
> > > memory allocation occurs when I generate my final numpy sub-array by
> > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > No, what accounts for the memory efficienty is there is no bulk
> > allocation at all. ?The ndarray you have points to the memory that's
> > in the mmap. ?There is no copying data or separate array allocation.
>
> Does this mean that everytime I iterate through an ndarray that is
> sourced from a memmap, the data is read from the disc? The sliced
> array is at no time wholly resident in memory? What are the
> performance implications of this?

Ok, sorry for the confusion.  What I should have said is that there is
no bulk allocation *by numpy* at all.  The call to mmap does allocate
a chunk of RAM to reflect file contents, but the numpy arrays don't
allocate any memory of their own: they use the same memory as was
allocated by the mmap call.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 12:52:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 15:52:13 -0200
Subject: block dynamic attribute creation
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<mailman.232.1235034007.11746.python-list@python.org>
	<ZMenl.405$Ez6.355@nwrddc02.gnilink.net>
Message-ID: <op.upl09b1fx6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 13:20:25 -0200, Alan G Isaac <alan.isaac at gmail.com>  
escribi?:

>>>        if hasattr(self, attr): #update val
>>>          self.__dict__[attr] = val

> On 2/19/2009 3:54 AM Gabriel Genellina apparently wrote:
>> In particular, your code prevents using class attributes as a default
>> value for instance attributes
>
> Doesn't the above allow that?

Sorry, yes, sure!


-- 
Gabriel Genellina



From amgusarov at gmail.com  Thu Feb 19 12:53:19 2009
From: amgusarov at gmail.com (Alex Gusarov)
Date: Thu, 19 Feb 2009 23:53:19 +0600
Subject: Search in list of dictionaries
In-Reply-To: <499D9938.5010207@mrabarnett.plus.com>
References: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
	<499D9938.5010207@mrabarnett.plus.com>
Message-ID: <549d7a20902190953o46684ca0k76f974cec8bb77d9@mail.gmail.com>

Thanks! This example is quite simple and works exactly the way I wanted.

On Thu, Feb 19, 2009 at 11:39 PM, MRAB <google at mrabarnett.plus.com> wrote:

> Alex Gusarov wrote:
>
>> Hello everybody!
>>
>> I've a list of dictionaries with 'shorcut' and 'command' keys. When user
>> types a word program must search this list for a typed shortcut and then run
>> linked command. What I've wrote:
>>
>>        for cmd in self.commands:
>>            if cmd['shortcut'] == input:
>>                os.popen(cmd['command'])
>>                break
>>        else:
>>            os.popen(input)
>>
>> But it's a brute-force method and I think there is another way in
>> searching items through a list by dictionary key. Please give me advice how
>> can I implement fast search in list of dictionaries by some dictionary key.
>> In my mind language:
>>
>> list.get({'shortcut' == input})
>>
>>  If want to go from the shortcut to the command (cmd['shortcut'] ->
> cmd['command']) the quickest way is using a dict, where cmd['shortcut']
> is the key and cmd['command'] is the value:
>
>    self.command_dict = {}
>    for cmd in self.commands:
>        self.command_dict[cmd['shortcut']] = cmd['command']
>
> and then:
>
>    os.popen(self.command_dict[input])
>
> This will raise a KeyError if it's unknown. The equivalent of your code
> above is:
>
>    os.popen(self.command_dict.get(input, input))
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From sturlamolden at yahoo.no  Thu Feb 19 13:00:27 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Thu, 19 Feb 2009 10:00:27 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com> 
	<ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com>
Message-ID: <5dd3bccc-ebcd-4af0-bedd-2ca0a7b331fc@j8g2000yql.googlegroups.com>

On 19 Feb, 03:13, Carl Banks <pavlovevide... at gmail.com> wrote:

> The offset parameter of mmap itself would be useful to map small
> portions of gigabyte-sized files, and maybe numpy.memmap can take
> advantage of that if the user passes an offset parameter. ?

NumPy's memmap is just a wrapper for Python 2.5's mmap. The offset
parameter does not affect the amount that is actually memory mapped.

S.M.





From philip at semanchuk.com  Thu Feb 19 13:07:28 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 19 Feb 2009 13:07:28 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
Message-ID: <3378BF84-0A38-42E2-9541-01B959333288@semanchuk.com>


On Feb 19, 2009, at 12:30 PM, Helly John J. wrote:

> Hi Philip.
> I installed the 2.5.4 binary from the python.org site.  I did this  
> because NumPy and SciPy currently only work with 2.5 and the system  
> version was 2.4.

It looks like you're using the same Python at the command line as the  
Python to which you installed GDAL. There shouldn't be anything else  
you have to do once easy-install is complete.

As Miles pointed out, you should probably try this:
from osgeo import gdal

instead of this:
import gdal

Although I gather the latter should work based on the documentation  
here:
http://trac.osgeo.org/gdal/wiki/GdalOgrInPython#imports

I can't see what went wrong with your installation.

You can try an uninstall and reinstall. (`easy_install -m GDAL` might  
do the uninstall for you.) If you're feeling adventurous, you can try  
to unwind the installation by hand. Edit easy-install.pth and delete  
the line that refers to GDAL, and then blow away the GDAL directory in  
site-packages.

I see that you originally ran the easy_install from the directory '/ 
Library/Python/2.5/site-packages'. Don't do that. I don't have a  
logical reason for why, but Python given that the current directory is  
part of Python's import search path, you might be giving easy_install  
a different "environment" than your regular Python session. It's just  
a shot in the dark, but worth a try.

Sorry I couldn't be of more help.




> On Feb 17, 2009, at 12:30 PM, Philip Semanchuk wrote:
>
> On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:
>
>> Hi.
>>
>> I'm a newbie to python and am running:
>>
>> OS X 10.5.6
>> Python 2.5.4
>
> Hi John,
> Are you using the system Python or have you installed another version?
>
> Cheers
> Philip
>
>
>
>
>>
>>
>> and have run easy_install for gdal like this:
>>
>> /Library/Python/2.5/site-packages>sudo easy_install GDAL
>> Password:
>> Searching for GDAL
>> Best match: GDAL 1.6.0
>> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
>> GDAL 1.6.0 is already the active version in easy-install.pth
>>
>> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5- 
>> macosx-10.5-i386.egg
>> Processing dependencies for GDAL
>> Finished processing dependencies for GDAL
>>
>> However, when I run python and try to import gdal, this is what  
>> happens:
>>
>> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
>> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>> Type "help", "copyright", "credits" or "license" for more  
>> information.
>> >>> import gdal
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> ImportError: No module named gdal
>> >>>
>>
>> Clearly, it's not being found but I don't understand how to debug  
>> this any further.  I have the *.egg in the site-packages directory  
>> but don't understand if there is something else I have to do to  
>> make it usable.  Any help would be much appreciated.
>> Cheers.
>> --------------
>> John Helly, University of California, San Diego
>> San Diego Supercomputer Center,  Mail Code 0527
>> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
>> and Physical Oceanography, Mail Code 0224
>> 9500 Gilman Dr., La Jolla CA 92093
>> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7  
>> (iChat) / URL (http://www.sdsc.edu/~hellyj)
>>


From kyosohma at gmail.com  Thu Feb 19 13:17:23 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 10:17:23 -0800 (PST)
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
	<Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>
Message-ID: <d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>

On Feb 19, 11:29?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> W. eWatson wrote:
> > Eric_Dex... at msn.com wrote:
> >> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> >>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
> >>> version is the choice for me. The other choice has unicode. Do I care?
> >>> --
> >>> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> >>> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> >>> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> >>> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>
>
> >> There is a good chance you don't care... ?I think the other is for
> >> internationalization... ?best to look.. ?It would be easier to answer
> >> the question if you said what you are going to do with it, and who
> >> needed to use your software. ?It's even possible that you might want
> >> to try pygame depending on what you want to use it for and who the
> >> audience is (and how good thier computers are)
>
> >>http://pypi.python.org/simple/Dex%20Tracker/
> > Thanks. I think I'll take the chance. Somewhat simple programming.
> > Off I go to install it. It can always be un-installed.
>
> Well, that was an interesting experience. It appears to have recompiled a
> lot of stuff, and probably some libraries. IDLE is still with me as the way
> to open py files. Apparently, if I want to get around IDLE, I may have to
> install some other editor.
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>

The compiling you are referring to is just making the py files into
pyc files. This is normal and is a speed improvement. In fact, a lot
of the scripts you write will create a pyc file when first run.

In other words, wxPython does not affect your Python install in any
way other than making itself available as a 3rd party package (i.e.
adding itself to the path), just like any other good 3rd party
package. I'm not sure why you're even talking about IDLE...wxPython is
a GUI toolkit, not an IDE.

Mike


From pavlovevidence at gmail.com  Thu Feb 19 13:28:47 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 10:28:47 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com> 
	<ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com> 
	<5dd3bccc-ebcd-4af0-bedd-2ca0a7b331fc@j8g2000yql.googlegroups.com>
Message-ID: <06e42c29-4d2d-4960-a448-6fbcda9607e4@v4g2000vbb.googlegroups.com>

On Feb 19, 10:00?am, sturlamolden <sturlamol... at yahoo.no> wrote:
> On 19 Feb, 03:13, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > The offset parameter of mmap itself would be useful to map small
> > portions of gigabyte-sized files, and maybe numpy.memmap can take
> > advantage of that if the user passes an offset parameter. ?
>
> NumPy's memmap is just a wrapper for Python 2.5's mmap. The offset
> parameter does not affect the amount that is actually memory mapped.

Yes, that's what I said, but in future numpy.mmap could be updated to
take advantage of mmap's new offset parameter.


Carl Banks


From steven.oldner at gmail.com  Thu Feb 19 13:32:00 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 10:32:00 -0800 (PST)
Subject: Newby Question for reading a file
Message-ID: <05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com>

Simple question but I haven't found an answer.  I program in ABAP, and
in ABAP you define the data structure of the file and move the file
line into the structure, and then do something to the fields.  That's
my mental reference.

How do I separate or address each field in the file line with PYTHON?
What's the correct way of thinking?

Thanks!


From gert.cuykens at gmail.com  Thu Feb 19 13:35:40 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 19 Feb 2009 10:35:40 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com> 
	<mailman.234.1235039030.11746.python-list@python.org>
Message-ID: <bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>

Hope you do not mind ignoring part of answers, so I can figure out
more why things work the way they are.
This two examples work, what i do not understand is that in function
display i do not have to declare root, v or x ?

----------
example 1
----------
from tkinter import *
from _thread import start_new_thread
from time import sleep

x=0
def weegbrug():
    global x
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,())

def display():
    v.set(x)
    root.after(500, lambda:display())

root = Tk()
v = StringVar()
txt = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
txt.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, lambda:display())
root.mainloop()


----------
example 2
----------
from tkinter import *
from threading import Thread
from time import sleep

class Weegbrug(Thread):
    def __init__(self):
        self.x=0
        Thread.__init__(self)
    def run(self):
        while True:
            self.x=self.x+1
            sleep(0.5)
w = Weegbrug()
w.start()

def display():
    v.set(w.x)
    root.after(500, lambda:display())

root = Tk()
v = StringVar()
txt = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
txt.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, lambda:display())
root.mainloop()


From lionel.keene at gmail.com  Thu Feb 19 13:36:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 10:36:49 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com>
Message-ID: <3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com>

On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > that memory is allocated at the slicing step in your example i.e. when
> > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > is constructed that memmaps the entire file. Some relatively small
> > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > No, what accounts for the memory efficienty is there is no bulk
> > > allocation at all. ?The ndarray you have points to the memory that's
> > > in the mmap. ?There is no copying data or separate array allocation.
>
> > Does this mean that everytime I iterate through an ndarray that is
> > sourced from a memmap, the data is read from the disc? The sliced
> > array is at no time wholly resident in memory? What are the
> > performance implications of this?
>
> Ok, sorry for the confusion. ?What I should have said is that there is
> no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> a chunk of RAM to reflect file contents, but the numpy arrays don't
> allocate any memory of their own: they use the same memory as was
> allocated by the mmap call.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

Thanks for the explanations Carl. I'm sorry, but it's me who's the
confused one here, not anyone else :-)

I hate to waste everyone's time again, but something is just not
"clicking" in that black-hole I call a brain. So..."numpy.memmap"
allocates a chunk off the heap to coincide with the file contents. If
I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
is allocated? That seems to contradict what is stated in the numpy
documentation:

"class numpy.memmap
Create a memory-map to an array stored in a file on disk.

Memory-mapped files are used for accessing small segments of large
files on disk, without reading the entire file into memory."

In my previous example that we were working with (100x100 data file),
you used an offset to memmap the "lower-half" of the array. Does this
mean that in the process of memmapping that lower half, RAM was set
aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
an entire file, there is no memory benefit in doing so.

At this point do you (or anyone else) recommend I just write a little
function for my class that takes the coords I intend to load and "roll
my own" function? Seems like the best way to keep memory to a minimum,
I'm just worried about performance. On the other hand, the most I'd be
loading would be around 1k x 1k worth of data.




From kyosohma at gmail.com  Thu Feb 19 13:40:36 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 10:40:36 -0800 (PST)
Subject: Newby Question for reading a file
References: 05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com
Message-ID: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>

On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
> Simple question but I haven't found an answer. ?I program in ABAP, and
> in ABAP you define the data structure of the file and move the file
> line into the structure, and then do something to the fields. ?That's
> my mental reference.
>
> How do I separate or address each field in the file line with PYTHON?
> What's the correct way of thinking?
>
> Thanks!

I don't really follow what you mean since I've never used ABAP, but
here's how I typically read a file in Python:

f = open("someFile.txt")
for line in f:
    # do something with the line
    print line
f.close()

Of course, you can read just portions of the file too, using something
like this:

f.read(64)

Which will read 64 bytes. For more info, check the following out:

http://www.diveintopython.org/file_handling/file_objects.html

 - Mike


From alan.isaac at gmail.com  Thu Feb 19 13:42:19 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 18:42:19 GMT
Subject: block dynamic attribute creation
In-Reply-To: <499d1ca1$0$26184$426a74cc@news.free.fr>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<499d1ca1$0$26184$426a74cc@news.free.fr>
Message-ID: <fKhnl.355$tw4.335@nwrddc01.gnilink.net>

On 2/19/2009 3:47 AM Bruno Desthuilliers apparently wrote:
>       if not hasattr(self, attr) and getattr(self, '_attrlock', False):
>         raise AttributeError(yadda yadda)
>       # NB: assume newstyle class
>       super(YourClass, self).__setattr__(attr, val)


Thanks.
Alan
PS Thanks also to all who restrained
themselves from saying, "don't do this".
;-)


From harijay at gmail.com  Thu Feb 19 13:51:39 2009
From: harijay at gmail.com (harijay)
Date: Thu, 19 Feb 2009 10:51:39 -0800 (PST)
Subject: reading binary data from a 32 bit machine  on 64 bit machine
Message-ID: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>

Hi I am very confused with the use of the struct module to read binary
data from a file.
( I have only worked with ascii files so far)

I have a file spec for a Data-logger (http://www.dataq.com/support/
techinfo/ff.htm)

I am collecting some voltage , time traces on one channel and they are
written to the binary file on a 32 bit windows machine

The file spec says that the number of header bytes in the data file
header is stored as a 16 bit  eye "I" at bits 6-7

Now I want to get at that number. When I try format !h I get a
meaningful number
If f is my file handle opened with "rb" mode

>>> f.seek(5)
>>> (Integer,) = struct.unpack('!h',f.read(2))
>>> (Integer,)
(9348,)

I am assuming that means that there are 9348 header bytes . Can
someone look at the format spec and tell me if I am on the right
track.

Also if a binary guru can point me in the direction of a single line
format pythonic way to get at the header that will be great

Thanks a tonne
hari


From nad at acm.org  Thu Feb 19 13:51:46 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 10:51:46 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
Message-ID: <nad-D1A1B2.10514619022009@ger.gmane.org>

In article <F71B1E4C-87A5-41DD-AA9A-92687223F0DB at ucsd.edu>,
 "Helly John J." <hellyj at ucsd.edu> wrote:
> I installed the 2.5.4 binary from the python.org site.  I did this  
> because NumPy and SciPy currently only work with 2.5 and the system  
> version was 2.4.
>[...]
> On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:
> > I'm a newbie to python and am running:
> > OS X 10.5.6
> > Python 2.5.4
>[...]
> > and have run easy_install for gdal like this:
> >
> > /Library/Python/2.5/site-packages>sudo easy_install GDAL
> > Password:
> > Searching for GDAL
> > Best match: GDAL 1.6.0
> > Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> > GDAL 1.6.0 is already the active version in easy-install.pth
> >
> > Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> > i386.egg
> > Processing dependencies for GDAL
> > Finished processing dependencies for GDAL
> >
> > However, when I run python and try to import gdal, this is what  
> > happens:
> >
> > Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> import gdal
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > ImportError: No module named gdal
> > >>>

It looks like you have installed GDAL to the site-packages directory of 
the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).  
That site-packages directory is /Library/Python/2.5. The Apple-supplied 
python comes with a sym link from /usr/bin/python.  If you launch it, 
you'll probably find GDAL is there as expected.

If you do want to use the python.org python, which is somewhat newer, 
you need to install its own version of setuptools/easy_install and use 
it to install GDAL to the site-packages directory of that python which 
is located here:
/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-pack
ages.  The two python instances co-exist.  To install another 
easy_install, ensure the python.org python come first first on your 
PATH, then follow the instructions here:
   <http://pypi.python.org/pypi/setuptools>

-- 
 Ned Deily,
 nad at acm.org



From mkhitrov at gmail.com  Thu Feb 19 13:52:54 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 13:52:54 -0500
Subject: Strange array.array performance
Message-ID: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>

Hello all,

I'm currently writing a Python <-> MATLAB interface with ctypes and
array.array class, using which I'll need to push large amounts of data
to MATLAB. Everything is working well, but there was one strange
performance-related issue that I ran into and wanted to ask about.
Here's some example code to illustrate my point (this is developed on
Windows, hence the use of clock):

---
from array import array
from time import clock

input = array('B', range(256) * 10000)

# Case 1
start = clock()
data1 = array('B', input)
print format(clock() - start, '.10f')

# Case 2
start = clock()
data2 = array('B')
data2[:] = input
print format(clock() - start, '.10f')

# Case 3
start = clock()
data3 = array('B')
data3.extend(input)
print format(clock() - start, '.10f')

print input == data1 == data2 == data3
---

The output from this on my machine is as follows:

0.7080547730
0.0029827034
0.0028685943
True

That seems very wrong. In the end, all arrays have the same data, but
by specifying it in the constructor the creation process takes over
350x longer than the other two methods. Is this a bug, or is there
some valid reason for it?

In the latter case, it would be a good idea to mention this in the
documentation, since that can be a significant performance improvement
in some applications. Currently the documentation states "Otherwise,
the iterable initializer is passed to the extend() method," which
doesn't seem to be the case, based on the third example.

- Max


From rNOSPAMon at flownet.com  Thu Feb 19 13:55:01 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 10:55:01 -0800
Subject: Regular expression bug?
Message-ID: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>

I'm trying to split a CamelCase string into its constituent components.  
This kind of works:

>>> re.split('[a-z][A-Z]', 'fooBarBaz')
['fo', 'a', 'az']

but it consumes the boundary characters.  To fix this I tried using 
lookahead and lookbehind patterns instead, but it doesn't work:

>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
['fooBarBaz']

However, it does seem to work with findall:

>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
['', '']

So the regular expression seems to be doing the Right Thing.  Is this a 
bug in re.split, or am I missing something?

(BTW, I tried looking at the source code for the re module, but I could 
not find the relevant code.  re.split calls sre_compile.compile().split, 
but the string 'split' does not appear in sre_compile.py.  So where does 
this method come from?)

I'm using Python2.5.

Thanks,
rg


From albert at spenarnc.xs4all.nl  Thu Feb 19 13:56:42 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 19 Feb 2009 18:56:42 GMT
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <kfbtyi.45w@spenarnc.xs4all.nl>

In article <03db1c69-828a-4961-914d-62fe10ed88fb at w39g2000prb.googlegroups.com>,
Xah Lee  <xahlee at gmail.com> wrote:
<SNIP>
>
>Pascal Constanza wrote:
>> Yes. There are actually complete software development methodologies
>> built around these ideas. Google for "extreme programming" and "agile
>> software methodologies".
>
>Pascal Constanza is a Common Lisp fanatic. Note here, that eXtreme
>Programing is one of the snake oil, that ran like rampant wild fire in
>the industry around 2002, with many books published on it on the
>supposed motherfucking hip Software Engineering practices, but today
>you don't hear much of it. I haven't looked at =E2=80=9CAgile programing=E2=
>=80=9D
>agile my ass, but it is probably a waste of time.
>
>... what society overwhelmingly asks for is snake oil. Of course, the
>snake oil has the most impressive names =E2=80=94otherwise you would be
>selling nothing=E2=80=94 like =E2=80=9CStructured Analysis and Design=E2=80=
>=9D, =E2=80=9CSoftware
>Engineering=E2=80=9D, =E2=80=9CMaturity Models=E2=80=9D, =E2=80=9CManagemen=
>t Information Systems=E2=80=9D,
>=E2=80=9CIntegrated Project Support Environments=E2=80=9D =E2=80=9CObject O=
>rientation=E2=80=9D and
>=E2=80=9CBusiness Process Re-engineering=E2=80=9D (the latter three being k=
>nown as
>IPSE, OO and BPR, respectively).=E2=80=9D =E2=80=94 Edsger W Dijkstra (1930=
>-2002), in
>EWD 1175: The strengths of the academic enterprise.
>

A couple of weeks ago, a collegue of mine held a lecture about
a company where he is hired,
building paper-folding and envelope-handling machines.
(We are hired hands).
Real time, and real time simulators. Full regression tests
after each change. Agile scrum all the way down.

It looks impressive especially from where I stand. ( Formal procedures that
take 6 months, and bad fixes because approved changes were no
good after all.)

So not dead by a margin, and less snake oil than most methodologies
I know of.

>  Xah

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steven.oldner at gmail.com  Thu Feb 19 14:07:21 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 11:07:21 -0800 (PST)
Subject: Newby Question for reading a file
References: 05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com 
	<6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
Message-ID: <3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>

On Feb 19, 12:40?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > Simple question but I haven't found an answer. ?I program in ABAP, and
> > in ABAP you define the data structure of the file and move the file
> > line into the structure, and then do something to the fields. ?That's
> > my mental reference.
>
> > How do I separate or address each field in the file line with PYTHON?
> > What's the correct way of thinking?
>
> > Thanks!
>
> I don't really follow what you mean since I've never used ABAP, but
> here's how I typically read a file in Python:
>
> f = open("someFile.txt")
> for line in f:
> ? ? # do something with the line
> ? ? print line
> f.close()
>
> Of course, you can read just portions of the file too, using something
> like this:
>
> f.read(64)
>
> Which will read 64 bytes. For more info, check the following out:
>
> http://www.diveintopython.org/file_handling/file_objects.html
>
> ?- Mike

Hi Mike,

ABAP is loosely based on COBOL.

Here is what I was trying to do, but ended up just coding in ABAP.

Read a 4 column text file of about 1,000 lines and compare the 2
middle field of each line.  If there is a difference, output the line.

The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
BEGDA(10) type c, and LGART(4) type c.
In ABAP the code is:
LOOP AT in_file.
  IF in_file-endda <> in_file-begda.
    WRITE:\ in_file. " that's same as python's print
  ENDIF.
ENDLOOP.

I can read the file, but didn't know how to look st the fields in the
line.  From what you wrote, I need to read each segment/field of the
line?

Thanks,

Steve


From nad at acm.org  Thu Feb 19 14:16:45 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 11:16:45 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
Message-ID: <nad-CE2288.11164519022009@ger.gmane.org>

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
 Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory of 
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).  
> That site-packages directory is /Library/Python/2.5. The Apple-supplied 
> python comes with a sym link from /usr/bin/python.  If you launch it, 
> you'll probably find GDAL is there as expected.
> 
> If you do want to use the python.org python, which is somewhat newer, 
> you need to install its own version of setuptools/easy_install and use 
> it to install GDAL to the site-packages directory of that python which 
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-pack
> ages.  The two python instances co-exist.  To install another 
  easy_install, ensure the python.org python comes first on your 
> PATH, then follow the instructions here:
>    <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory 
of the python.org python framework.  So to ensure you are using that 
easy_install and that python, make sure that bin directory is on your 
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin:$PATH"

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 14:23:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 17:23:14 -0200
Subject: Strange array.array performance
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
Message-ID: <op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 16:52:54 -0200, Maxim Khitrov <mkhitrov at gmail.com>  
escribi?:

> input = array('B', range(256) * 10000)
>
> # Case 1
> start = clock()
> data1 = array('B', input)
> print format(clock() - start, '.10f')

> That seems very wrong. In the end, all arrays have the same data, but
> by specifying it in the constructor the creation process takes over
> 350x longer than the other two methods. Is this a bug, or is there
> some valid reason for it?

It's a known issue: http://bugs.python.org/issue5109

-- 
Gabriel Genellina



From andreas.schawo at googlemail.com  Thu Feb 19 14:23:52 2009
From: andreas.schawo at googlemail.com (Andy)
Date: Thu, 19 Feb 2009 11:23:52 -0800 (PST)
Subject: Regression test test_site failed on current trunk
Message-ID: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>

Hi,

I checked out the python trunk (curently 2.7a0), compiled it on my
linux machine and run the regression test suit. Below is the output of
the failed part:

test_site
[14871 refs]
test test_site failed -- Traceback (most recent call last):
  File "/mybook/storage/python_lnx/Lib/test/test_site.py", line 105,
in test_s_option
    self.assertEqual(rc, 1)
AssertionError: 0 != 1

Is this something serious.

I compiled python with:
./configure --prefix=/dev/null --with-pydebug
make -s

Further I've got problems with moving the cursor when I started python
(2.7a0). There are only esc sequences displayed. My Local installation
(2.5.2) works fine.


From marduk at letterboxes.org  Thu Feb 19 14:26:46 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 19 Feb 2009 14:26:46 -0500
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <1235071606.26110.18.camel@localhost.localdomain>

On Thu, 2009-02-19 at 10:55 -0800, Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.  
> This kind of works:
> 
> >>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using 
> lookahead and lookbehind patterns instead, but it doesn't work:

That's how re.split works, same as str.split...

> >>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
> >>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']


Wow!

To tell you the truth, I can't even read that... but one wonders why
don't you just do

def ccsplit(s):
    cclist = []
    current_word = ''
    for char in s:
        if char in string.uppercase:
            if current_word:
                cclist.append(current_word)
            current_word = char
        else:
            current_word += char
    if current_word:
        ccl.append(current_word)
    return cclist

>>> ccsplit('fooBarBaz')
--> ['foo', 'Bar', 'Baz']

This is arguably *much* more easy to read than the re example doesn't
require one to look ahead in the string.

-a




From robert.kern at gmail.com  Thu Feb 19 14:35:45 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 19 Feb 2009 13:35:45 -0600
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
Message-ID: <gnkcah$rqa$1@ger.gmane.org>

On 2009-02-19 12:52, Maxim Khitrov wrote:
> Hello all,
>
> I'm currently writing a Python<->  MATLAB interface with ctypes and
> array.array class, using which I'll need to push large amounts of data
> to MATLAB.

Have you taken a look at mlabwrap?

   http://mlabwrap.sourceforge.net/

At the very least, you will probably want to use numpy arrays instead of 
array.array.

   http://numpy.scipy.org/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From __peter__ at web.de  Thu Feb 19 14:38:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 20:38:11 +0100
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
Message-ID: <gnkceu$5i9$02$1@news.t-online.com>

steven.oldner wrote:

> On Feb 19, 12:40?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>>
>> > Simple question but I haven't found an answer. ?I program in ABAP, and
>> > in ABAP you define the data structure of the file and move the file
>> > line into the structure, and then do something to the fields. ?That's
>> > my mental reference.
>>
>> > How do I separate or address each field in the file line with PYTHON?
>> > What's the correct way of thinking?
>>
>> > Thanks!
>>
>> I don't really follow what you mean since I've never used ABAP, but
>> here's how I typically read a file in Python:
>>
>> f = open("someFile.txt")
>> for line in f:
>> # do something with the line
>> print line
>> f.close()
>>
>> Of course, you can read just portions of the file too, using something
>> like this:
>>
>> f.read(64)
>>
>> Which will read 64 bytes. For more info, check the following out:
>>
>> http://www.diveintopython.org/file_handling/file_objects.html
>>
>> - Mike
> 
> Hi Mike,
> 
> ABAP is loosely based on COBOL.
> 
> Here is what I was trying to do, but ended up just coding in ABAP.
> 
> Read a 4 column text file of about 1,000 lines and compare the 2
> middle field of each line.  If there is a difference, output the line.
> 
> The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> BEGDA(10) type c, and LGART(4) type c.
> In ABAP the code is:
> LOOP AT in_file.
>   IF in_file-endda <> in_file-begda.
>     WRITE:\ in_file. " that's same as python's print
>   ENDIF.
> ENDLOOP.
> 
> I can read the file, but didn't know how to look st the fields in the
> line.  From what you wrote, I need to read each segment/field of the
> line?

Yes you can get portions of the line by slicing:

for line in open("infile"):
    if line[8:18] != line[18:28]:
            print line,

Or you can use the struct module:

import struct
for line in open("infile"):
    pernr, endda, begda, lgart, dummy = struct.unpack("8s10s10s4s1s", line)
    if endda != begda:
        print line,

I'm assuming that a row in your input file is just the fields glued together
followed by a newline.

Peter



From kwmsmith at gmail.com  Thu Feb 19 14:41:17 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Thu, 19 Feb 2009 13:41:17 -0600
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <c266a7930902191141l3da1cd26h2e7e9781543fb01c@mail.gmail.com>

On Thu, Feb 19, 2009 at 12:55 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> I'm trying to split a CamelCase string into its constituent components.
> This kind of works:
>
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
>
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
>
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
>
> However, it does seem to work with findall:
>
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
>
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?

>From what I can tell, re.split can't split on zero-length boundaries.
It needs something to split on, like str.split.  Is this a bug?
Possibly.  The docs for re.split say:

Split the source string by the occurrences of the pattern,
    returning a list containing the resulting substrings.

Note that it does not say that zero-length matches won't work.

I can work around the problem thusly:

re.sub(r'(?<=[a-z])(?=[A-Z])', '_', 'fooBarBaz').split('_')

Which is ugly.  I reckon you can use re.findall with a pattern that
matches the components and not the boundaries, but you have to take
care of the beginning and end as special cases.

Kurt


From curt.hash at gmail.com  Thu Feb 19 14:44:12 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Thu, 19 Feb 2009 12:44:12 -0700
Subject: Newby Question for reading a file
In-Reply-To: <3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
Message-ID: <736698790902191144p4f5a250dud6c2fa83787942ae@mail.gmail.com>

On Thu, Feb 19, 2009 at 12:07 PM, steven.oldner <steven.oldner at gmail.com> wrote:
>
> On Feb 19, 12:40 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > On Feb 19, 12:32 pm, "steven.oldner" <steven.old... at gmail.com> wrote:
> >
> > > Simple question but I haven't found an answer.  I program in ABAP, and
> > > in ABAP you define the data structure of the file and move the file
> > > line into the structure, and then do something to the fields.  That's
> > > my mental reference.
> >
> > > How do I separate or address each field in the file line with PYTHON?
> > > What's the correct way of thinking?
> >
> > > Thanks!
> >
> > I don't really follow what you mean since I've never used ABAP, but
> > here's how I typically read a file in Python:
> >
> > f = open("someFile.txt")
> > for line in f:
> >     # do something with the line
> >     print line
> > f.close()
> >
> > Of course, you can read just portions of the file too, using something
> > like this:
> >
> > f.read(64)
> >
> > Which will read 64 bytes. For more info, check the following out:
> >
> > http://www.diveintopython.org/file_handling/file_objects.html
> >
> >  - Mike
>
> Hi Mike,
>
> ABAP is loosely based on COBOL.
>
> Here is what I was trying to do, but ended up just coding in ABAP.
>
> Read a 4 column text file of about 1,000 lines and compare the 2
> middle field of each line.  If there is a difference, output the line.
>
> The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> BEGDA(10) type c, and LGART(4) type c.
> In ABAP the code is:
> LOOP AT in_file.
>  IF in_file-endda <> in_file-begda.
>    WRITE:\ in_file. " that's same as python's print
>  ENDIF.
> ENDLOOP.
>
> I can read the file, but didn't know how to look st the fields in the
> line.  From what you wrote, I need to read each segment/field of the
> line?
>
> Thanks,
>
> Steve
> --
> http://mail.python.org/mailman/listinfo/python-list

You could do something like this:

f = open('file.txt', 'r')
for line in f:
    a,b = line.split()[1:-1]   # tokenize the string into sequence of
length 4 and store two middle values in a and b
    if a != b:
        print line
f.close()


From schumann at fnal.gov  Thu Feb 19 14:47:09 2009
From: schumann at fnal.gov (Carl Schumann)
Date: Thu, 19 Feb 2009 13:47:09 -0600
Subject: Explanation for trailing comma in example from Learning Python?
Message-ID: <499DB73D.1010208@fnal.gov>

Hi,

I am surprised at the trailing comma in the following example from 
"Learning Python":
> Python 2.3.4 (#1, Dec 10 2007, 15:05:56)
> [GCC 3.4.5 20051201 (Red Hat 3.4.5-2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> def f(*args): print args
> ...
> >>> f()
> ()
> >>> f(1)
> (1,)
> >>> f(1,2)
> (1, 2)
> >>> f(1,2,3)
> (1, 2, 3)
> >>> f(1,2,3,4)
> (1, 2, 3, 4)
> >>>
I could see the logic in always or never having a trailing comma.   What 
I don't understand here is why only the single element case has a 
trailing comma.   Any explanations please?

Thanks,
Carl Schumann




From andrew at acooke.org  Thu Feb 19 14:51:06 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 16:51:06 -0300 (CLST)
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <34b34b7c7b3c5d5230212d26837fc039.squirrel@localhost>


i wonder what fraction of people posting with "bug?" in their titles here
actually find bugs?

anyway, how about:

re.findall('[A-Z]?[a-z]*', 'fooBarBaz')

or

re.findall('([A-Z][a-z]*|[a-z]+)', 'fooBarBaz')

(you have to specify what you're matching and lookahead/back doesn't do
that).

andrew


Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.
> This kind of works:
>
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
>
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
>
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
>
> However, it does seem to work with findall:
>
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
>
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?
>
> (BTW, I tried looking at the source code for the re module, but I could
> not find the relevant code.  re.split calls sre_compile.compile().split,
> but the string 'split' does not appear in sre_compile.py.  So where does
> this method come from?)
>
> I'm using Python2.5.
>
> Thanks,
> rg
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From __peter__ at web.de  Thu Feb 19 14:52:58 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 20:52:58 +0100
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <gnkdal$bcq$01$1@news.t-online.com>

Ron Garret wrote:

> I'm trying to split a CamelCase string into its constituent components.

How about

>>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
['foo', 'Bar', 'Baz']

> This kind of works:
> 
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
> 
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
> 
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?

IRC the split pattern must consume at least one character, but I can't find
the reference.
 
> (BTW, I tried looking at the source code for the re module, but I could
> not find the relevant code.  re.split calls sre_compile.compile().split,
> but the string 'split' does not appear in sre_compile.py.  So where does
> this method come from?)

It's coded in C. The source is Modules/sremodule.c.

Peter


From mkhitrov at gmail.com  Thu Feb 19 14:53:21 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 14:53:21 -0500
Subject: Strange array.array performance
In-Reply-To: <gnkcah$rqa$1@ger.gmane.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
Message-ID: <26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>
>> Hello all,
>>
>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>> array.array class, using which I'll need to push large amounts of data
>> to MATLAB.
>
> Have you taken a look at mlabwrap?
>
>  http://mlabwrap.sourceforge.net/
>
> At the very least, you will probably want to use numpy arrays instead of
> array.array.
>
>  http://numpy.scipy.org/

I have, but numpy is not currently available for python 2.6, which is
what I need for some other features, and I'm trying to keep the
dependencies down in any case. Mlabwrap description doesn't mention if
it is thread-safe, and that's another one of my requirements.

The only feature that I'm missing with array.array is the ability to
quickly pre-allocate large chunks of memory. To do that right now I'm
using array('d', (0,) * size). It would be nice if array accepted an
int as the second argument indicating how much memory to allocate and
initialize to 0.

- Max


From mkhitrov at gmail.com  Thu Feb 19 14:53:59 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 14:53:59 -0500
Subject: Strange array.array performance
In-Reply-To: <op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <26ddd1750902191153q621d94f5xcf32ecf8e4513503@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:23 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Thu, 19 Feb 2009 16:52:54 -0200, Maxim Khitrov <mkhitrov at gmail.com>
> escribi?:
>
>> input = array('B', range(256) * 10000)
>>
>> # Case 1
>> start = clock()
>> data1 = array('B', input)
>> print format(clock() - start, '.10f')
>
>> That seems very wrong. In the end, all arrays have the same data, but
>> by specifying it in the constructor the creation process takes over
>> 350x longer than the other two methods. Is this a bug, or is there
>> some valid reason for it?
>
> It's a known issue: http://bugs.python.org/issue5109

I see, thanks.


From google at mrabarnett.plus.com  Thu Feb 19 14:56:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 19:56:53 +0000
Subject: reading binary data from a 32 bit machine  on 64 bit machine
In-Reply-To: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
References: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
Message-ID: <499DB985.2040107@mrabarnett.plus.com>

harijay wrote:
> Hi I am very confused with the use of the struct module to read binary
> data from a file.
> ( I have only worked with ascii files so far)
> 
> I have a file spec for a Data-logger (http://www.dataq.com/support/
> techinfo/ff.htm)
> 
> I am collecting some voltage , time traces on one channel and they are
> written to the binary file on a 32 bit windows machine
> 
> The file spec says that the number of header bytes in the data file
> header is stored as a 16 bit  eye "I" at bits 6-7
> 
> Now I want to get at that number. When I try format !h I get a
> meaningful number
> If f is my file handle opened with "rb" mode
> 
>>>> f.seek(5)
>>>> (Integer,) = struct.unpack('!h',f.read(2))
>>>> (Integer,)
> (9348,)
> 
> I am assuming that means that there are 9348 header bytes . Can
> someone look at the format spec and tell me if I am on the right
> track.
> 
> Also if a binary guru can point me in the direction of a single line
> format pythonic way to get at the header that will be great
> 
The number of header bytes is stored in bytes 6-7, so you need seek(6),
and the 16-bit value is little-endian as far as I can tell:

     f.seek(6)
     header_bytes, = struct.unpack('<h', f.read(2))


From thomasmallen at gmail.com  Thu Feb 19 14:58:11 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Thu, 19 Feb 2009 11:58:11 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
	<788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com> 
	<mailman.223.1235013371.11746.python-list@python.org>
Message-ID: <d3a5affc-c48d-405e-8f61-fa66d63f1875@13g2000yql.googlegroups.com>

On Feb 18, 10:15?pm, rdmur... at bitdance.com wrote:
> Thomas Allen <thomasmal... at gmail.com> wrote:
> > On Feb 18, 4:51 am, alex23 <wuwe... at gmail.com> wrote:
> > > On Feb 18, 7:34 pm, rdmur... at bitdance.com wrote:
>
> > > > Yeah, but wget -r -k will do that bit of it, too.
>
> > > Wow, nice, I don't know why I never noticed that. Cheers!
>
> > Hm...doesn't do that over here. I thought it may have been because of
> > absolute links (not to site root), but it even leaves things like <a
> > href="/">. Does it work for you guys?
>
> It works for me. ?The sample pages I just tested on it don't use
> any href="/" links, but my 'href="/about.html"' got properly
> converted to 'href="../about.html"'. ?(On the other hand my '/contact.html'
> got converted to a full external URL...but that's apparently because the
> contact.html file doesn't actually exist :)
>
> --RDM

Thanks for the help everyone. The idea of counting the slashes was the
linchpin of this little script, and with a little trial and error, I
successfully generated a local copy of the site. I don't think my
colleague knows what went into this, but he seemed appreciative :^)

Thomas


From google at mrabarnett.plus.com  Thu Feb 19 15:03:45 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 20:03:45 +0000
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <499DBB21.9080600@mrabarnett.plus.com>

Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.  
> This kind of works:
> 
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using 
> lookahead and lookbehind patterns instead, but it doesn't work:
> 
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
> 
> So the regular expression seems to be doing the Right Thing.  Is this a 
> bug in re.split, or am I missing something?
> 
> (BTW, I tried looking at the source code for the re module, but I could 
> not find the relevant code.  re.split calls sre_compile.compile().split, 
> but the string 'split' does not appear in sre_compile.py.  So where does 
> this method come from?)
> 
> I'm using Python2.5.
> 
I, amongst others, think it's a bug (or 'misfeature'); Guido thinks it
might be intentional, but changing it could break some existing code.
You could do this instead:

 >>> re.sub('(?<=[a-z])(?=[A-Z])', '@', 'fooBarBaz').split('@')
['foo', 'Bar', 'Baz']


From steven.oldner at gmail.com  Thu Feb 19 15:10:22 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 12:10:22 -0800 (PST)
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com> 
	<mailman.276.1235072657.11746.python-list@python.org>
Message-ID: <95d6b271-88a4-4c04-b582-d7ed665b44d4@f3g2000yqf.googlegroups.com>

On Feb 19, 1:44?pm, Curt Hash <curt.h... at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 12:07 PM, steven.oldner <steven.old... at gmail.com> wrote:
>
> > On Feb 19, 12:40 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > On Feb 19, 12:32 pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > > > Simple question but I haven't found an answer. ?I program in ABAP, and
> > > > in ABAP you define the data structure of the file and move the file
> > > > line into the structure, and then do something to the fields. ?That's
> > > > my mental reference.
>
> > > > How do I separate or address each field in the file line with PYTHON?
> > > > What's the correct way of thinking?
>
> > > > Thanks!
>
> > > I don't really follow what you mean since I've never used ABAP, but
> > > here's how I typically read a file in Python:
>
> > > f = open("someFile.txt")
> > > for line in f:
> > > ? ? # do something with the line
> > > ? ? print line
> > > f.close()
>
> > > Of course, you can read just portions of the file too, using something
> > > like this:
>
> > > f.read(64)
>
> > > Which will read 64 bytes. For more info, check the following out:
>
> > >http://www.diveintopython.org/file_handling/file_objects.html
>
> > > ?- Mike
>
> > Hi Mike,
>
> > ABAP is loosely based on COBOL.
>
> > Here is what I was trying to do, but ended up just coding in ABAP.
>
> > Read a 4 column text file of about 1,000 lines and compare the 2
> > middle field of each line. ?If there is a difference, output the line.
>
> > The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> > BEGDA(10) type c, and LGART(4) type c.
> > In ABAP the code is:
> > LOOP AT in_file.
> > ?IF in_file-endda <> in_file-begda.
> > ? ?WRITE:\ in_file. " that's same as python's print
> > ?ENDIF.
> > ENDLOOP.
>
> > I can read the file, but didn't know how to look st the fields in the
> > line. ?From what you wrote, I need to read each segment/field of the
> > line?
>
> > Thanks,
>
> > Steve
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> You could do something like this:
>
> f = open('file.txt', 'r')
> for line in f:
> ? ? a,b = line.split()[1:-1] ? # tokenize the string into sequence of
> length 4 and store two middle values in a and b
> ? ? if a != b:
> ? ? ? ? print line
> f.close()- Hide quoted text -
>
> - Show quoted text -

Peter, you are correct, just fields glued together.  I did not know
there was a struc module and that code looks real good.  This is
something I will use in the future. Thanks!

Curt, that looks good also.  I just need to test the 2 middle values.
I didn't know how to store line.split values into variables and this
is simple. Thanks!

Again, thanks Mike, Peter and Curt.  Now if you ever need to know
ABAP... ;)






From http  Thu Feb 19 15:18:04 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 12:18:04 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
Message-ID: <7x8wo2kwoz.fsf@ruckus.brouhaha.com>

sturlamolden <sturlamolden at yahoo.no> writes:
> Yes, the GIL prevents Python threads from being used in a certain way.
> But do you really need to use threads like that? Or do you just think
> you do?

How old is your computer, why did you buy it, and is it the first one
you ever owned?

For most of us, I suspect, it is not our first one, and we bought it
to get a processing speedup relative to the previous one.  If such
speedups were useless or unimportant, we would not have blown our hard
earned cash replacing perfectly good older hardware, so we have to
accept the concept that speed matters and ignore those platitudes that
say otherwise.

It used to be that new computers were faster than the old ones because
they ran at higher clock rates.  That was great, no software changes
at all were required to benefit from the higher speed.  Now, they get
the additional speed by having more cores.  That's better than nothing
but making use of it requires fixing the GIL.


From pavlovevidence at gmail.com  Thu Feb 19 15:26:33 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 12:26:33 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com> 
	<3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com>
Message-ID: <d5ca741f-66e8-4a38-ba1f-61bce976f751@b16g2000yqb.googlegroups.com>

On Feb 19, 10:36?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > > that memory is allocated at the slicing step in your example i.e. when
> > > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > > is constructed that memmaps the entire file. Some relatively small
> > > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > > No, what accounts for the memory efficienty is there is no bulk
> > > > allocation at all. ?The ndarray you have points to the memory that's
> > > > in the mmap. ?There is no copying data or separate array allocation.
>
> > > Does this mean that everytime I iterate through an ndarray that is
> > > sourced from a memmap, the data is read from the disc? The sliced
> > > array is at no time wholly resident in memory? What are the
> > > performance implications of this?
>
> > Ok, sorry for the confusion. ?What I should have said is that there is
> > no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> > a chunk of RAM to reflect file contents, but the numpy arrays don't
> > allocate any memory of their own: they use the same memory as was
> > allocated by the mmap call.
>
> > Carl Banks- Hide quoted text -
>
> > - Show quoted text -
>
> Thanks for the explanations Carl. I'm sorry, but it's me who's the
> confused one here, not anyone else :-)
>
> I hate to waste everyone's time again, but something is just not
> "clicking" in that black-hole I call a brain. So..."numpy.memmap"
> allocates a chunk off the heap to coincide with the file contents. If
> I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
> is allocated? That seems to contradict what is stated in the numpy
> documentation:
>
> "class numpy.memmap
> Create a memory-map to an array stored in a file on disk.
>
> Memory-mapped files are used for accessing small segments of large
> files on disk, without reading the entire file into memory."

Yes, it allocates room for the whole file in your process's LOGICAL
address space.  However, it doesn't actually reserve any PHYSICAL
memory, or read in any data from the disk, until you've actually
access the data.  And then it only reads small chunks in, not the
whole file.

So when you mmap your 1GB file, the OS sets aside a 1 GB chunk of
address to use for your memory map.  That's all it does: it doesn't
read anything from disk, it doesn't reserve any physical RAM.  Later,
when you access a byte in the mmap via a pointer, the OS notes that it
hasn't yet loaded the data at that address, so it grabs a small chunk
of physical ram and reads in the a small amount of data from the disk
containing the byte you are accessing.  This all happens automatically
and transparently to you.


> In my previous example that we were working with (100x100 data file),
> you used an offset to memmap the "lower-half" of the array. Does this
> mean that in the process of memmapping that lower half, RAM was set
> aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
> an entire file, there is no memory benefit in doing so.

The mmap call sets aside room for all 100x100 32-bit complex numbers
in logical address space, regardless of whether you use the offset
parameter or not.  However, it might only read in part of the file in
from disk, and will only reserve physical RAM for the parts it reads
in.


> At this point do you (or anyone else) recommend I just write a little
> function for my class that takes the coords I intend to load and "roll
> my own" function? Seems like the best way to keep memory to a minimum,
> I'm just worried about performance. On the other hand, the most I'd be
> loading would be around 1k x 1k worth of data.-

No, if your file is not too large to mmap, just do it the way you've
been doing it.  The documentation you've been reading is pretty much
correct, even if you approach it naively.  It is both memory and I/O
efficient.  You're overthinking things here; don't try to outsmart the
operating system.  It'll take care of the performance issues
satisfactorily.

The only thing you have to worry about is if the file is too large to
fit into your process's logical address space, which on a typical 32-
bit system is 2-3 GB (depending on configuration) minus the space
occupied by Python and other heap objects, which is probably only a
few MB.



Carl Banks


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 15:31:25 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 18:31:25 -0200
Subject: reading binary data from a 32 bit machine  on 64 bit machine
References: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
Message-ID: <op.upl8mnr2x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 16:51:39 -0200, harijay <harijay at gmail.com> escribi?:

> Hi I am very confused with the use of the struct module to read binary
> data from a file.
> ( I have only worked with ascii files so far)
>
> I have a file spec for a Data-logger (http://www.dataq.com/support/
> techinfo/ff.htm)

That format is rather convoluted -- due to historical reasons, I imagine...

> I am collecting some voltage , time traces on one channel and they are
> written to the binary file on a 32 bit windows machine
>
> The file spec says that the number of header bytes in the data file
> header is stored as a 16 bit  eye "I" at bits 6-7

If it says "at *byte* positions 6-7" you need a seek(6) to start reading  
 from there, not seek(5).

> Now I want to get at that number. When I try format !h I get a
> meaningful number
> If f is my file handle opened with "rb" mode
>
>>>> f.seek(5)
>>>> (Integer,) = struct.unpack('!h',f.read(2))
>>>> (Integer,)
> (9348,)
>
> I am assuming that means that there are 9348 header bytes . Can
> someone look at the format spec and tell me if I am on the right
> track.

Not exactly. Why '!' (network byte order)? The spec doesn't say about byte  
order, but since it's a Windows program we can assume little endian, '<'  
or just '=' (native).
But instead of multiple seeks + micro-reads I'd read the whole header and  
decode it at once (the fixed part is only 110 bytes long):

fixed_header_fmt = struct.Struct("<HHBBhLL...")
f = open(..., 'rb')
fixed_header = f.read(110)
elements = [None]
elements[1:] = fixed_header_fmt.unpack(fixed_header)
# just to keep the 1-based element numbering

Now, elements[4] is the fourth row in the table, "Number of bytes in each  
channel info entry"

The format is built from the Type column: UI -> H, I -> h, B -> B, UL ->  
L, L -> l, D -> d, F -> f.

-- 
Gabriel Genellina



From steve at holdenweb.com  Thu Feb 19 15:33:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:33:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <499DC237.9010301@holdenweb.com>

rushenaly at gmail.com wrote:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)
> 
> Thank you so much great community...
> Rushen

By the way, since you have chosen Java you might be interested to know
that the JPython implementation (also open source) generates JVM
bytecode, and allows you to freely mix Java and Python classes.

There is no Global Interpreter Lock in JPython ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 15:33:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:33:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <499DC237.9010301@holdenweb.com>

rushenaly at gmail.com wrote:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)
> 
> Thank you so much great community...
> Rushen

By the way, since you have chosen Java you might be interested to know
that the JPython implementation (also open source) generates JVM
bytecode, and allows you to freely mix Java and Python classes.

There is no Global Interpreter Lock in JPython ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From invalid at invalid  Thu Feb 19 15:44:00 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 19 Feb 2009 14:44:00 -0600
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.284.1235075660.11746.python-list@python.org>
Message-ID: <19idnYERhNYNWQDUnZ2dnUVZ_vqdnZ2d@posted.visi>

On 2009-02-19, Steve Holden <steve at holdenweb.com> wrote:

> By the way, since you have chosen Java you might be interested
> to know that the JPython implementation (also open source)
> generates JVM bytecode, and allows you to freely mix Java and
> Python classes.
>
> There is no Global Interpreter Lock in JPython ...

I think somebody should propose adding one.

It would be a nice change of pace from the standard
never-ending thread(s) on the GIL.

-- 
Grant Edwards                   grante             Yow! I'm into SOFTWARE!
                                  at               
                               visi.com            


From steve at holdenweb.com  Thu Feb 19 15:47:48 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:47:48 -0500
Subject: Regression test test_site failed on current trunk
In-Reply-To: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
References: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
Message-ID: <gnkghj$d56$1@ger.gmane.org>

Andy wrote:
> Hi,
> 
> I checked out the python trunk (curently 2.7a0), compiled it on my
> linux machine and run the regression test suit. Below is the output of
> the failed part:
> 
> test_site
> [14871 refs]
> test test_site failed -- Traceback (most recent call last):
>   File "/mybook/storage/python_lnx/Lib/test/test_site.py", line 105,
> in test_s_option
>     self.assertEqual(rc, 1)
> AssertionError: 0 != 1
> 
> Is this something serious.
> 
I'd say any test failure without an obvious explanation is serious
enough to report as a bug. See http://bugs.python.org/

> I compiled python with:
> ./configure --prefix=/dev/null --with-pydebug
> make -s
> 
> Further I've got problems with moving the cursor when I started python
> (2.7a0). There are only esc sequences displayed. My Local installation
> (2.5.2) works fine.

Do you mean you can't get previous lines in your Python command history
to show up? This sounds as though you may not have built the readline
support in to your experimental build. I can't remember exactly what the
deal is, but I know that readline is GPL licensed, so it may not come as
part of the standard distribution.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From garrickp at gmail.com  Thu Feb 19 15:48:37 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 12:48:37 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>

On Feb 19, 1:18?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> ... ?If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

That's fair, but by using a high level language in the first place,
you've already made the conscious decision to sacrifice speed for ease
of programming. Otherwise, you would probably be programming in C.

The question really is "Is it fast enough", and the answer usually is
"Yes". And when the answer is "No", there are many things which can be
done before the need to multi-thread the whole script comes about.

It's a proposition that used to bother me, until I did some actual
programming of real world problems in Python. I've yet to really find
a case where the application was slow enough to justify the cost of
using multiple Python processes.

~G


From frankrentef at yahoo.com  Thu Feb 19 15:50:27 2009
From: frankrentef at yahoo.com (frankrentef)
Date: Thu, 19 Feb 2009 12:50:27 -0800 (PST)
Subject: Newbie request assistance....Python - PAMIE - Java
Message-ID: <c8e0768f-0407-4c9f-a9db-d4a89089511a@v19g2000yqn.googlegroups.com>

Greetings all...

Newbie here to the Python world.  I've written some basic script with
the purpose of automating testing of an application via Python /
Pamie.  I've had pretty good success until a spot I'm testing displays
a Java pop up.  I need to have Pamie access the fields in the window
(i.e. add a value and activate the "enter" button.)  Can someone
assist.

Some of the code I have currently is as follows...when the script I've
written gets to the end the java window pops up automatically....I
don't understand how to interface with it.

THNX

ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMAX', '5000.00')
time.sleep(2)
ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMIN', '0')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
ie.timesleep(2)
ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMaxMicrRejects',
'1')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_arc1_btnUpdate')
time.sleep2


From lists at cheimes.de  Thu Feb 19 15:54:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 19 Feb 2009 21:54:34 +0100
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <499DB73D.1010208@fnal.gov>
References: <499DB73D.1010208@fnal.gov>
Message-ID: <gnkgua$cr1$1@ger.gmane.org>

Carl Schumann wrote:
> I could see the logic in always or never having a trailing comma.   What
> I don't understand here is why only the single element case has a
> trailing comma.   Any explanations please?

Does this code shad some light on the trailing comma? :)

>>> (1) == 1
True
>>> (1,) == 1
False
>>> type((1))
<type 'int'>
>>> type((1,))
<type 'tuple'>

>>> a = 1
>>> a
1
>>> a = (1)
>>> a
1
>>> a = (1,)
>>> a
(1,)
>>> a = 1,
>>> a
(1,)



From rt8396 at gmail.com  Thu Feb 19 15:54:34 2009
From: rt8396 at gmail.com (r)
Date: Thu, 19 Feb 2009 12:54:34 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com> 
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
Message-ID: <5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>

On Feb 19, 2:29?am, Lie <Lie.1... at gmail.com> wrote:
> On Feb 18, 8:02?pm, r <rt8... at gmail.com> wrote:
> Blender's UI is designed for effective and efficient 3D workflow, not
> for low learning curve.

And that will be it's downfall!

I know what what Blenders UI is designed for. However not too many
people get religious about learning a UI, which is the only way you
will ever learn Blenders UI. This is why although Blender has a cult
following, it will never grow into a tool that the mainstream world
knows about, or for that matter cares about.

I have been using Blender on and off for almost a year and i still
cannot get comfortable with the UI. For instance adding a material to
a object involves multiple steps between multiple windows (WHAT!). Go
take a look at SketchUp's UI and you will see how the future will
look. Even 3DS or Maya is easier to learn that Blender.






From aleksandr.goretoy at gmail.com  Thu Feb 19 15:57:54 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Thu, 19 Feb 2009 14:57:54 -0600
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <gnkgua$cr1$1@ger.gmane.org>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
Message-ID: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>

Thank you for clerification Christian,
when using trailing comma with print statement/function, does it not mean to
output newline after printed data?

-Alex Goretoy
http://www.goretoy.com



On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de> wrote:

> Carl Schumann wrote:
> > I could see the logic in always or never having a trailing comma.   What
> > I don't understand here is why only the single element case has a
> > trailing comma.   Any explanations please?
>
> Does this code shad some light on the trailing comma? :)
>
> >>> (1) == 1
> True
> >>> (1,) == 1
> False
> >>> type((1))
> <type 'int'>
> >>> type((1,))
> <type 'tuple'>
>
> >>> a = 1
> >>> a
> 1
> >>> a = (1)
> >>> a
> 1
> >>> a = (1,)
> >>> a
> (1,)
> >>> a = 1,
> >>> a
> (1,)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From clp2 at rebertia.com  Thu Feb 19 15:58:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 12:58:29 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
Message-ID: <50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>

On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi,
>
> I have a class derived from two parents (in blue below), which gives me the
> following error:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 291, in <module>
>     class ListControl(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
> Googling suggested I should add
> from noconflict import classmaker
> and
>
> __metaclass__=classmaker()
> to this class.
>
> However, I don't seem able to find where to get the noconflict module from.
>
> Do any of you where noconflict  could be downloaded/installed from ?

>From what I could google, you should in theory be able to fix the
problem (without using any 3rd party module) by doing:

class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
    pass

class ListControl(wx.Frame, CopyAndPaste):
    __metaclass__ = ListControlMeta
    #rest of class...

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mabdelkader at gmail.com  Thu Feb 19 16:01:55 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 19 Feb 2009 16:01:55 -0500
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <148918f0902191301n362878dbo20d868c662db168e@mail.gmail.com>

A comma is what generates a tuple. It's not the parenthesis;)
http://docs.python.org/library/stdtypes.html#typesseq

"A single item tuple must have a trailing comma, such as (d,)."

On Thu, Feb 19, 2009 at 3:57 PM, alex goretoy
<aleksandr.goretoy at gmail.com>wrote:

> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not mean
> to output newline after printed data?
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
>
>
> On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de>wrote:
>
>> Carl Schumann wrote:
>> > I could see the logic in always or never having a trailing comma.   What
>> > I don't understand here is why only the single element case has a
>> > trailing comma.   Any explanations please?
>>
>> Does this code shad some light on the trailing comma? :)
>>
>> >>> (1) == 1
>> True
>> >>> (1,) == 1
>> False
>> >>> type((1))
>> <type 'int'>
>> >>> type((1,))
>> <type 'tuple'>
>>
>> >>> a = 1
>> >>> a
>> 1
>> >>> a = (1)
>> >>> a
>> 1
>> >>> a = (1,)
>> >>> a
>> (1,)
>> >>> a = 1,
>> >>> a
>> (1,)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From rNOSPAMon at flownet.com  Thu Feb 19 16:02:39 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:02:39 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.281.1235073821.11746.python-list@python.org>
Message-ID: <rNOSPAMon-E63D31.13023919022009@news.gha.chartermi.net>

In article <mailman.281.1235073821.11746.python-list at python.org>,
 MRAB <google at mrabarnett.plus.com> wrote:

> Ron Garret wrote:
> > I'm trying to split a CamelCase string into its constituent components.  
> > This kind of works:
> > 
> >>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> > ['fo', 'a', 'az']
> > 
> > but it consumes the boundary characters.  To fix this I tried using 
> > lookahead and lookbehind patterns instead, but it doesn't work:
> > 
> >>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> > ['fooBarBaz']
> > 
> > However, it does seem to work with findall:
> > 
> >>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> > ['', '']
> > 
> > So the regular expression seems to be doing the Right Thing.  Is this a 
> > bug in re.split, or am I missing something?
> > 
> > (BTW, I tried looking at the source code for the re module, but I could 
> > not find the relevant code.  re.split calls sre_compile.compile().split, 
> > but the string 'split' does not appear in sre_compile.py.  So where does 
> > this method come from?)
> > 
> > I'm using Python2.5.
> > 
> I, amongst others, think it's a bug (or 'misfeature'); Guido thinks it
> might be intentional, but changing it could break some existing code.

That seems unlikely.  It would only break where people had code invoking 
re.split on empty matches, which at the moment is essentially a no-op.  
It's hard to imagine there's a lot of code like that around.  What would 
be the point?

> You could do this instead:
> 
>  >>> re.sub('(?<=[a-z])(?=[A-Z])', '@', 'fooBarBaz').split('@')
> ['foo', 'Bar', 'Baz']

Blech!  ;-)  But thanks for the suggestion.

rg


From rNOSPAMon at flownet.com  Thu Feb 19 16:03:59 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:03:59 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<gnkdal$bcq$01$1@news.t-online.com>
Message-ID: <rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net>

In article <gnkdal$bcq$01$1 at news.t-online.com>,
 Peter Otten <__peter__ at web.de> wrote:

> Ron Garret wrote:
> 
> > I'm trying to split a CamelCase string into its constituent components.
> 
> How about
> 
> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
> ['foo', 'Bar', 'Baz']

That's very clever.  Thanks!

> > (BTW, I tried looking at the source code for the re module, but I could
> > not find the relevant code.  re.split calls sre_compile.compile().split,
> > but the string 'split' does not appear in sre_compile.py.  So where does
> > this method come from?)
> 
> It's coded in C. The source is Modules/sremodule.c.

Ah.  Thanks!

rg


From clp2 at rebertia.com  Thu Feb 19 16:04:34 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 13:04:34 -0800
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <50697b2c0902191304u5dc6cf4dj797fc724faac2b74@mail.gmail.com>

> On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de> wrote:
>>
>> Carl Schumann wrote:
>> > I could see the logic in always or never having a trailing comma.   What
>> > I don't understand here is why only the single element case has a
>> > trailing comma.   Any explanations please?
>>
>> Does this code shad some light on the trailing comma? :)
>>
>> >>> (1) == 1
>> True
>> >>> (1,) == 1
>> False
>> >>> type((1))
>> <type 'int'>
>> >>> type((1,))
>> <type 'tuple'>
>>
>> >>> a = 1
>> >>> a
>> 1
>> >>> a = (1)
>> >>> a
>> 1
>> >>> a = (1,)
>> >>> a
>> (1,)
>> >>> a = 1,
>> >>> a
>> (1,)
>>
On Thu, Feb 19, 2009 at 12:57 PM, alex goretoy
<aleksandr.goretoy at gmail.com> wrote:
> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not mean to
> output newline after printed data?
>
> -Alex Goretoy
> http://www.goretoy.com

Yes it does (it outputs a space instead of a newline), but only with
the print-statement, not the print() function.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From rNOSPAMon at flownet.com  Thu Feb 19 16:06:32 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:06:32 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.277.1235073073.11746.python-list@python.org>
Message-ID: <rNOSPAMon-C4EBDC.13063219022009@news.gha.chartermi.net>

In article <mailman.277.1235073073.11746.python-list at python.org>,
 "andrew cooke" <andrew at acooke.org> wrote:

> i wonder what fraction of people posting with "bug?" in their titles here
> actually find bugs?

IMHO it ought to be an invariant that len(r.split(s)) should always be 
one more than len(r.findall(s)).

> anyway, how about:
> 
> re.findall('[A-Z]?[a-z]*', 'fooBarBaz')
> 
> or
> 
> re.findall('([A-Z][a-z]*|[a-z]+)', 'fooBarBaz')

That will do it.  Thanks!

rg


From rNOSPAMon at flownet.com  Thu Feb 19 16:08:19 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:08:19 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.273.1235071607.11746.python-list@python.org>
Message-ID: <rNOSPAMon-2E6FA0.13081919022009@news.gha.chartermi.net>

In article <mailman.273.1235071607.11746.python-list at python.org>,
 Albert Hopkins <marduk at letterboxes.org> wrote:

> On Thu, 2009-02-19 at 10:55 -0800, Ron Garret wrote:
> > I'm trying to split a CamelCase string into its constituent components.  
> > This kind of works:
> > 
> > >>> re.split('[a-z][A-Z]', 'fooBarBaz')
> > ['fo', 'a', 'az']
> > 
> > but it consumes the boundary characters.  To fix this I tried using 
> > lookahead and lookbehind patterns instead, but it doesn't work:
> 
> That's how re.split works, same as str.split...

I think one could make the argument that 'foo'.split('') ought to return 
['f','o','o']

> 
> > >>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> > ['fooBarBaz']
> > 
> > However, it does seem to work with findall:
> > 
> > >>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> > ['', '']
> 
> 
> Wow!
> 
> To tell you the truth, I can't even read that...

It's a regexp.  Of course you can't read it.  ;-)

rg


From steve at holdenweb.com  Thu Feb 19 16:08:37 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 16:08:37 -0500
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <gnkhol$g8g$2@ger.gmane.org>

alex goretoy wrote:
> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not
> mean to output newline after printed data?
> 
It does (in Python before 3.0) - but that has nothing to do with the
original question. You will find you get quite different results for

print 1,         # print integer 1 followed by no newline

and

print (1, )      # print the one-element tuple whose element
                 # is the integer 1, followed by a newline.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Thu Feb 19 16:31:51 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 13:31:51 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com> 
	<3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com> 
	<d5ca741f-66e8-4a38-ba1f-61bce976f751@b16g2000yqb.googlegroups.com>
Message-ID: <32a9bd0a-4355-4a02-819c-8ed90b7e8256@g1g2000pra.googlegroups.com>

On Feb 19, 12:26?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 19, 10:36?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > > > that memory is allocated at the slicing step in your example i.e. when
> > > > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > > > is constructed that memmaps the entire file. Some relatively small
> > > > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > > > No, what accounts for the memory efficienty is there is no bulk
> > > > > allocation at all. ?The ndarray you have points to the memory that's
> > > > > in the mmap. ?There is no copying data or separate array allocation.
>
> > > > Does this mean that everytime I iterate through an ndarray that is
> > > > sourced from a memmap, the data is read from the disc? The sliced
> > > > array is at no time wholly resident in memory? What are the
> > > > performance implications of this?
>
> > > Ok, sorry for the confusion. ?What I should have said is that there is
> > > no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> > > a chunk of RAM to reflect file contents, but the numpy arrays don't
> > > allocate any memory of their own: they use the same memory as was
> > > allocated by the mmap call.
>
> > > Carl Banks- Hide quoted text -
>
> > > - Show quoted text -
>
> > Thanks for the explanations Carl. I'm sorry, but it's me who's the
> > confused one here, not anyone else :-)
>
> > I hate to waste everyone's time again, but something is just not
> > "clicking" in that black-hole I call a brain. So..."numpy.memmap"
> > allocates a chunk off the heap to coincide with the file contents. If
> > I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
> > is allocated? That seems to contradict what is stated in the numpy
> > documentation:
>
> > "class numpy.memmap
> > Create a memory-map to an array stored in a file on disk.
>
> > Memory-mapped files are used for accessing small segments of large
> > files on disk, without reading the entire file into memory."
>
> Yes, it allocates room for the whole file in your process's LOGICAL
> address space. ?However, it doesn't actually reserve any PHYSICAL
> memory, or read in any data from the disk, until you've actually
> access the data. ?And then it only reads small chunks in, not the
> whole file.
>
> So when you mmap your 1GB file, the OS sets aside a 1 GB chunk of
> address to use for your memory map. ?That's all it does: it doesn't
> read anything from disk, it doesn't reserve any physical RAM. ?Later,
> when you access a byte in the mmap via a pointer, the OS notes that it
> hasn't yet loaded the data at that address, so it grabs a small chunk
> of physical ram and reads in the a small amount of data from the disk
> containing the byte you are accessing. ?This all happens automatically
> and transparently to you.
>
> > In my previous example that we were working with (100x100 data file),
> > you used an offset to memmap the "lower-half" of the array. Does this
> > mean that in the process of memmapping that lower half, RAM was set
> > aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
> > an entire file, there is no memory benefit in doing so.
>
> The mmap call sets aside room for all 100x100 32-bit complex numbers
> in logical address space, regardless of whether you use the offset
> parameter or not. ?However, it might only read in part of the file in
> from disk, and will only reserve physical RAM for the parts it reads
> in.
>
> > At this point do you (or anyone else) recommend I just write a little
> > function for my class that takes the coords I intend to load and "roll
> > my own" function? Seems like the best way to keep memory to a minimum,
> > I'm just worried about performance. On the other hand, the most I'd be
> > loading would be around 1k x 1k worth of data.-
>
> No, if your file is not too large to mmap, just do it the way you've
> been doing it. ?The documentation you've been reading is pretty much
> correct, even if you approach it naively. ?It is both memory and I/O
> efficient. ?You're overthinking things here; don't try to outsmart the
> operating system. ?It'll take care of the performance issues
> satisfactorily.
>
> The only thing you have to worry about is if the file is too large to
> fit into your process's logical address space, which on a typical 32-
> bit system is 2-3 GB (depending on configuration) minus the space
> occupied by Python and other heap objects, which is probably only a
> few MB.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

I see. That was very well explained Carl, thank you.


From andreas.schawo at googlemail.com  Thu Feb 19 16:47:23 2009
From: andreas.schawo at googlemail.com (Andy)
Date: Thu, 19 Feb 2009 13:47:23 -0800 (PST)
Subject: Regression test test_site failed on current trunk
References: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
	<mailman.286.1235076484.11746.python-list@python.org>
Message-ID: <b92a52b8-1783-4a2b-b467-6548798c726d@j1g2000yqi.googlegroups.com>

On 19 Feb., 21:47, Steve Holden <st... at holdenweb.com> wrote:

> Do you mean you can't get previous lines in your Python command history
> to show up? This sounds as though you may not have built the readline
> support in to your experimental build. I can't remember exactly what the
> deal is, but I know that readline is GPL licensed, so it may not come as
> part of the standard distribution.

Thanks for your reply.
I just want to move left and right with the cursor keys.
Thats it.
I installed libreadline5-dev and rerun ./configure and make
...now it works.




From oamram at gmail.com  Thu Feb 19 16:56:38 2009
From: oamram at gmail.com (oamram)
Date: Thu, 19 Feb 2009 13:56:38 -0800 (PST)
Subject: iterating through files
Message-ID: <22048070.post@talk.nabble.com>


Hi Pythonist,
new to python. i have a directory with about 50 text file and i need to
iterate through them and get 
line 7 to 11 from each file and write those lines into another file(one file
that will contain all lines).

Cheers, Omer.
-- 
View this message in context: http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From woodygar at sky.com  Thu Feb 19 17:07:01 2009
From: woodygar at sky.com (Gary Wood)
Date: Thu, 19 Feb 2009 22:07:01 -0000
Subject: No subject
Message-ID: <6307CF549D1943C0802D29730A70BD99@Woodygar>

 I'm stuck on a tutorial Hands on Python3
Exercise 1.13.7.3. ** Complete the following function. This starting code is in joinAllStub.py. Save it to the new name joinAll.py. Note the way an example is given in the documentation string. It simulates the use of the function in the Shell. This is a common convention: 

import string
'''exercise to complete and test this function'''
def joinStrings(sentance):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
     # finish the code for this function
# i tried this but not sure whats mising
    for i in sentance:
        print(i)
    
    
   #this worked for numbers      
   # def sumList(nums):                                #1 
   # '''Return the sum of the numbers in nums.'''   
    #sum = 0                                       #2 
   # for num in nums:                              #3 
   #     sum = sum + num                           #4 
  #  return sum   
    
       
   
    


def main():
    print(joinStrings(['very','hot' ,'day']))
    print(joinStrings(['this', 'is', 'it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()
-------------- next part --------------
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From http  Thu Feb 19 17:11:31 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 14:11:31 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <7x3aeadqlo.fsf@ruckus.brouhaha.com>

Falcolas <garrickp at gmail.com> writes:
> That's fair, but by using a high level language in the first place,
> you've already made the conscious decision to sacrifice speed for ease
> of programming. Otherwise, you would probably be programming in C.

That Python is so much slower than C is yet another area where Python
can use improvement.  

> It's a proposition that used to bother me, until I did some actual
> programming of real world problems in Python. I've yet to really find
> a case where the application was slow enough to justify the cost of
> using multiple Python processes.

Right, that's basically the issue here: the cost of using multiple
Python processes is unnecessarily high.  If that cost were lower then
we could more easily use multiple cores to make oru apps faster.


From clp2 at rebertia.com  Thu Feb 19 17:11:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 14:11:48 -0800
Subject: No subject
In-Reply-To: <6307CF549D1943C0802D29730A70BD99@Woodygar>
References: <6307CF549D1943C0802D29730A70BD99@Woodygar>
Message-ID: <50697b2c0902191411q61ef08d2tb3de31aaf152b78a@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:07 PM, Gary Wood <woodygar at sky.com> wrote:
>  I'm stuck on a tutorial Hands on Python3
>
> Exercise 1.13.7.3. ** Complete the following function. This starting code is
> in joinAllStub.py. Save it to the new name joinAll.py. Note the way an
> example is given in the documentation string. It simulates the use of the
> function in the Shell. This is a common convention:
>
> import string
> '''exercise to complete and test this function'''
> def joinStrings(sentance):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>      # finish the code for this function
> # i tried this but not sure whats mising
>     for i in sentance:
>         print(i)

You're not supposed to output the strings, you've supposed to combine
them and return the single combined string (it's nearly identical to
how you summed the numbers). The printing is done by the calls to
print() outside of this function.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From rushenaly at gmail.com  Thu Feb 19 17:18:34 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 14:18:34 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>

Hi again

I really want to imply that i am not in search of a perfect language.
Python for programming productivity is a great language but there are
some real world facts. Some people want a language that provides great
flexibility. A language can provide threads and processes and
programmer choose the way. I really believe that GIL is a design
error.

Thanks.

Rushen


From vriolk at gmail.com  Thu Feb 19 17:20:14 2009
From: vriolk at gmail.com (coldpizza)
Date: Thu, 19 Feb 2009 14:20:14 -0800 (PST)
Subject: Tkinter: stopping a background thread on demand
Message-ID: <03c4679e-014d-4fc7-976e-ba52312f99c2@41g2000yqf.googlegroups.com>

I am writing a Tk GUI for a console script. I start a background
thread and pass it a callback function which writes debug info to a
Text widget in the main Tk loop.

I tried to find what is the established way to cleanly abort a child
thread when the user clicks the Stop button, but apparently Python
does not allow the parent process to explicitly stop a child thread.
Also I could not figure out how a parent can send a signal for a child
to stop and let it cleanup and exit cleanly.

I finally figured out a solution which was to set a 'TERMINATE' flag
on the `func_dict` property of the callback function, and then check
for the flag in the child module, but I still have doubts that this is
the proper way to do this sort of thing.

This works fine but it looks more like a dirty hack to me so my
question is: what is the proper way to send a signal to a child thread
to gracefully terminate, assuming the user decided to cancel an
operation?

from Tkinter import *
import threading

root = Tk()

class ConverterThread(threading.Thread):
    def __init__(self, source, target, callbackFunc):
        threading.Thread.__init__(self, name='converterThread')
        self.infile = srcName
        self.outfile = destName
        self.callbackFunc = callbackFunc
    def run(self):
        import myconverter
        myconverter.convert(self.infile, self.outfile,
self.callbackFunc)

def stopConversion(event=None):
    global job
    if (job and job.isAlive()):
        callbackFunc.func_dict['TERMINATE'] = True
        job = None

def updateLogCallback(data=None):
        log.insert(END, str(data))
        log.see('end')

job = ConverterThread(src='file1', dest='file2, updateLogCallback)
job.start()

stopBtn = Button(root, text="Stop", command=stopConversion)
stopBtn.pack()
log = Text(root)
root.mainloop()


And the callbackFunc in myConverter.py looks like this:

def printCallback(data):
    if (callback):
        callback(data)
        if callback.func_dict['TERMINATE'] == True:
            clean_up()
            sys.exit()
    else:
        print data




From kyosohma at gmail.com  Thu Feb 19 17:22:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 14:22:21 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org>
Message-ID: <8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>

On Feb 19, 3:56?pm, oamram <oam... at gmail.com> wrote:
> Hi Pythonist,
> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one file
> that will contain all lines).
>
> Cheers, Omer.
> --
> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> Sent from the Python - python-list mailing list archive at Nabble.com.

I would recommend using the glob module to grab a list of the files
you want or you can just create your own list. Then use a loop to grab
the lines you want. Something like this:

f = open(textFile)
newFile = open(newFileName, "a")
x = 1
for line in f.readlines():
    if x >=7 and x <=11:
         newFile.write(line + "\n")

You could even put the above inside a loop that loops over the list of
files. Anyway, that's one approach. I'm sure there are many others.

Mike


From kyosohma at gmail.com  Thu Feb 19 17:28:25 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 14:28:25 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org> 
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>
Message-ID: <b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>

On Feb 19, 4:22?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 19, 3:56?pm, oamram <oam... at gmail.com> wrote:
>
> > Hi Pythonist,
> > new to python. i have a directory with about 50 text file and i need to
> > iterate through them and get
> > line 7 to 11 from each file and write those lines into another file(one file
> > that will contain all lines).
>
> > Cheers, Omer.
> > --
> > View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> > Sent from the Python - python-list mailing list archive at Nabble.com.
>
> I would recommend using the glob module to grab a list of the files
> you want or you can just create your own list. Then use a loop to grab
> the lines you want. Something like this:
>
> f = open(textFile)
> newFile = open(newFileName, "a")
> x = 1
> for line in f.readlines():
> ? ? if x >=7 and x <=11:
> ? ? ? ? ?newFile.write(line + "\n")
>
> You could even put the above inside a loop that loops over the list of
> files. Anyway, that's one approach. I'm sure there are many others.
>
> Mike

Oops...I forgot to iterate the counter. The code should look like
this:

<code>

f = open(textFile)
newFile = open(newFileName, "a")
x = 1
for line in f.readlines():
    if x >=7 and x <=11:
         newFile.write(line + "\n")
    x +=1

</code>

Sorry about that.

Mike


From clp2 at rebertia.com  Thu Feb 19 17:33:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 14:33:55 -0800
Subject: iterating through files
In-Reply-To: <b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
References: <mailman.293.1235080603.11746.python-list@python.org>
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>
	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
Message-ID: <50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyosohma at gmail.com> wrote:
> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>>
>> > Hi Pythonist,
>> > new to python. i have a directory with about 50 text file and i need to
>> > iterate through them and get
>> > line 7 to 11 from each file and write those lines into another file(one file
>> > that will contain all lines).
>>
>> > Cheers, Omer.
>> > --
>> > View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
>> > Sent from the Python - python-list mailing list archive at Nabble.com.
>>
>> I would recommend using the glob module to grab a list of the files
>> you want or you can just create your own list. Then use a loop to grab
>> the lines you want. Something like this:
>>
>> f = open(textFile)
>> newFile = open(newFileName, "a")
>> x = 1
>> for line in f.readlines():
>>     if x >=7 and x <=11:
>>          newFile.write(line + "\n")
>>
>> You could even put the above inside a loop that loops over the list of
>> files. Anyway, that's one approach. I'm sure there are many others.
>>
>> Mike
>
> Oops...I forgot to iterate the counter. The code should look like
> this:
>
> <code>
>
> f = open(textFile)
> newFile = open(newFileName, "a")
> x = 1
> for line in f.readlines():
>    if x >=7 and x <=11:
>         newFile.write(line + "\n")
>    x +=1
>
> </code>

Or you could use enumerate(); also, readlines() isn't necessary:

f = open(textFile)
newFile = open(newFileName, "a")
for x, line in enumerate(f):
    if x >=7 and x <=11:
        newFile.write(line + "\n")

Sounds a bit like homework to me though...

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tim.wintle at teamrubber.com  Thu Feb 19 17:35:19 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 22:35:19 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <1235082919.21735.30.camel@tim-laptop>

On Thu, 2009-02-19 at 12:48 -0800, Falcolas wrote:
> That's fair, but by using a high level language in the first place,
> you've already made the conscious decision to sacrifice speed for ease
> of programming. Otherwise, you would probably be programming in C.
My parents would have gone mad at me for saying that when I was young -
C is just about the highest-level language they ever used - Assembly/hex
all the way!

So if you really want speed then why don't you write your code in
assembly? That's the only "perfect language" - it's capable of doing
everything in the most efficient way possible on your machine.

Of course that's a hassle, so I guess you may as well use C, since
that's almost certainly only linearly worse than using assembly, and it
takes far less time to use.

Oh, but then you may as well use python, since (again) that's probably
only linearly worse than C, and well-programmed C at that - I certainly
wouldn't end up with some of the optimisations that have gone into the
python interpreter!

That's basically what my mind goes through whenever I choose a language
to use for a task - and why I almost always end up with Python.

> It's a proposition that used to bother me, until I did some actual
> programming of real world problems in Python. I've yet to really find
> a case where the application was slow enough to justify the cost of
> using multiple Python processes.

I deal with those situations a fair bit - but the solutions are normally
easy - if it's limited by waiting for IO then I use threads, if it's
limited by waiting for CPU time then I use multiple processes, or share
the job over another application (such as MySQL), or run a task over a
cluster.

If you have a task where the linear optimisation offered by multiple
cores is really important then you can either:
 * Run it over multiple processes, or multiple machines in Python
or
 * spend a year writing it in C or assembly, by which time you can buy a
new machine that will run it fine in Python.


Yes, we're coming to a point where we're going to have tens of cores in
a chip, but by that time someone far cleverer than me (possibly someone
who's on this list) will have solved that problem. The top experts in
many fields use Python, and if they weren't able to make use of multiple
core chips, then there wouldn't be any demand for them.

Tim Wintle


> 
> ~G
> --
> http://mail.python.org/mailman/listinfo/python-list



From digitig at gmail.com  Thu Feb 19 17:35:38 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 22:35:38 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <7x3aeadqlo.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <aee48b3c0902191435s56cedaa4mf6d810b1152d6548@mail.gmail.com>

2009/2/19 Paul Rubin <http>:

> That Python is so much slower than C is yet another area where Python
> can use improvement.

No, because we don't use Python where C would be more appropriate.
Sure nobody would complain if Python were faster, but it's not for
speed that we choose Python. Not speed of /execution/ that is.
Different languages have different trade-offs. Python's trade-offs
suit us. If they don't suit you, use a language with trade-offs that
do.


-- 
Tim Rowe


From digitig at gmail.com  Thu Feb 19 17:37:02 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 22:37:02 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
Message-ID: <aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Hi again
>
> I really want to imply that i am not in search of a perfect language.
> Python for programming productivity is a great language but there are
> some real world facts. Some people want a language that provides great
> flexibility. A language can provide threads and processes and
> programmer choose the way. I really believe that GIL is a design
> error.

It's only an error if it gets in the way. It's the experience of a lot
of programmers that it doesn't, so it's not an error.


-- 
Tim Rowe


From steve at holdenweb.com  Thu Feb 19 17:53:40 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 17:53:40 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
Message-ID: <gnkntk$608$1@ger.gmane.org>

Tim Rowe wrote:
> 2009/2/19  <rushenaly at gmail.com>:
>> Hi again
>>
>> I really want to imply that i am not in search of a perfect language.
>> Python for programming productivity is a great language but there are
>> some real world facts. Some people want a language that provides great
>> flexibility. A language can provide threads and processes and
>> programmer choose the way. I really believe that GIL is a design
>> error.
> 
> It's only an error if it gets in the way. It's the experience of a lot
> of programmers that it doesn't, so it's not an error.
> 
And it's not a feature of the language, rather of one or two
implementations. Neither JPython not IronPython use a GIL to the best of
my knowledge, so you are still quite at liberty to use them.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 17:56:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 17:56:30 -0500
Subject: iterating through files
In-Reply-To: <50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>
References: <mailman.293.1235080603.11746.python-list@python.org>	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
	<50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>
Message-ID: <gnko2u$608$2@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyosohma at gmail.com> wrote:
>> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>>>
>>>> Hi Pythonist,
>>>> new to python. i have a directory with about 50 text file and i need to
>>>> iterate through them and get
>>>> line 7 to 11 from each file and write those lines into another file(one file
>>>> that will contain all lines).
>>>> Cheers, Omer.
>>>> --
>>>> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
>>>> Sent from the Python - python-list mailing list archive at Nabble.com.
>>> I would recommend using the glob module to grab a list of the files
>>> you want or you can just create your own list. Then use a loop to grab
>>> the lines you want. Something like this:
>>>
>>> f = open(textFile)
>>> newFile = open(newFileName, "a")
>>> x = 1
>>> for line in f.readlines():
>>>     if x >=7 and x <=11:
>>>          newFile.write(line + "\n")
>>>
>>> You could even put the above inside a loop that loops over the list of
>>> files. Anyway, that's one approach. I'm sure there are many others.
>>>
>>> Mike
>> Oops...I forgot to iterate the counter. The code should look like
>> this:
>>
>> <code>
>>
>> f = open(textFile)
>> newFile = open(newFileName, "a")
>> x = 1
>> for line in f.readlines():
>>    if x >=7 and x <=11:
>>         newFile.write(line + "\n")
>>    x +=1
>>
>> </code>
> 
> Or you could use enumerate(); also, readlines() isn't necessary:
> 
> f = open(textFile)
> newFile = open(newFileName, "a")
> for x, line in enumerate(f):
>     if x >=7 and x <=11:
>         newFile.write(line + "\n")
> 
> Sounds a bit like homework to me though...
> 
But all these solutions read the whole file.  You should really read six
lines throwing them away then read five lines to keep.

Since this might be homework I'll not write the code, but it will
involve f.next() ...

regards
  Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mensanator at aol.com  Thu Feb 19 18:05:22 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 15:05:22 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org> 
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com> 
	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com> 
	<50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com> 
	<mailman.301.1235084417.11746.python-list@python.org>
Message-ID: <3c5040c1-a130-4c51-94f0-08248d6193b6@j10g2000prn.googlegroups.com>

On Feb 19, 4:56?pm, Steve Holden <st... at holdenweb.com> wrote:
> Chris Rebert wrote:
> > On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>
> >>>> Hi Pythonist,
> >>>> new to python. i have a directory with about 50 text file and i need to
> >>>> iterate through them and get
> >>>> line 7 to 11 from each file and write those lines into another file(one file
> >>>> that will contain all lines).
> >>>> Cheers, Omer.
> >>>> --
> >>>> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> >>>> Sent from the Python - python-list mailing list archive at Nabble.com.
> >>> I would recommend using the glob module to grab a list of the files
> >>> you want or you can just create your own list. Then use a loop to grab
> >>> the lines you want. Something like this:
>
> >>> f = open(textFile)
> >>> newFile = open(newFileName, "a")
> >>> x = 1
> >>> for line in f.readlines():
> >>> ? ? if x >=7 and x <=11:
> >>> ? ? ? ? ?newFile.write(line + "\n")
>
> >>> You could even put the above inside a loop that loops over the list of
> >>> files. Anyway, that's one approach. I'm sure there are many others.
>
> >>> Mike
> >> Oops...I forgot to iterate the counter. The code should look like
> >> this:
>
> >> <code>
>
> >> f = open(textFile)
> >> newFile = open(newFileName, "a")
> >> x = 1
> >> for line in f.readlines():
> >> ? ?if x >=7 and x <=11:
> >> ? ? ? ? newFile.write(line + "\n")
> >> ? ?x +=1
>
> >> </code>
>
> > Or you could use enumerate(); also, readlines() isn't necessary:
>
> > f = open(textFile)
> > newFile = open(newFileName, "a")
> > for x, line in enumerate(f):
> > ? ? if x >=7 and x <=11:
> > ? ? ? ? newFile.write(line + "\n")
>
> > Sounds a bit like homework to me though...
>
> But all these solutions read the whole file. ?You should really read six
> lines throwing them away then read five lines to keep.

It might be useful not to assume every file has at least 11 lines
and program accordingly.

>
> Since this might be homework I'll not write the code, but it will
> involve f.next() ...
>
> regards
> ? Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/- Hide quoted text -
>
> - Show quoted text -



From fabiofz at gmail.com  Thu Feb 19 18:11:19 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 19 Feb 2009 20:11:19 -0300
Subject: Pydev 1.4.3 Released
Message-ID: <cfb578b20902191511s829d924q83069fda919e0930@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.3 have been released

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com

Release Highlights in Pydev Extensions:
-----------------------------------------------------------------

* Fixed racing conditions in the context-insensitive indexing which
could corrupt the index.
* Search references working on Eclipse 3.3 and Eclipse 3.4
* Lambda properly treated as a new context for code-analysis
* Analysis is now recognizing __name__
* Analysis now marks variables used when accessed with augstore (+=)
* Some definitions were not properly indexed on some assign cases


Release Highlights in Pydev:
----------------------------------------------

* Interactive console The interpreter to be used can be chosen
* New modules can be created from templates
* Interpreter configuration improved!
      o Environment variables can be specified for a given interpreter
      o Canceling operation now works correctly

* Debugger
      o Variables correctly gotten on Jython 2.1 / 2.2
      o Using globals as an union of original globals+locals so that
generator expressions can be evaluated
      o Breakpoints only opened on double-click (no longer on select)

* The project preferences are now applied even if the page to
configure the project is not visible.
* Jython 2.5b1 working (problem with sitecustomize)
* Wrap paragraph fixed
* Set comprehension working on Python 3.0 parsing
* Find definition working when a module outside of the known pythonpath is found
* Source folders were not properly found sometimes -- when workspace
was not properly refreshed
* Invalid modules could get in the memory
* Getting the grammar version for a project could be wrong (and could
loose its indexing at that time)
* Multiple external zip files can be added at once to the pythonpath
* nonlocal added to keywords
* Fixed annoying problem where cursor was jumping when it shouldn't (outline)
* Fixed problem where the breakpoint could be lost (now, playing safe
and matching anything in the file if the context cannot be gotten)
* Ctrl + 2 + --reindex can be used to reindex all the opened projects
if the indexing becomes corrupt
* Changing nothing on project config and pressing OK no longer
reanalyzes the modules



What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From tim.wintle at teamrubber.com  Thu Feb 19 18:16:32 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 23:16:32 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <7x8wo2kwoz.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <1235085392.21735.57.camel@tim-laptop>

On Thu, 2009-02-19 at 12:18 -0800, Paul Rubin wrote:
> If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

Kind of agree (although I use a netbook at lot at the moment, and I
don't use that because of speed-ups!)

> It used to be that new computers were faster than the old ones because
> they ran at higher clock rates.  That was great, no software changes
> at all were required to benefit from the higher speed.  Now, they get
> the additional speed by having more cores.  That's better than nothing
> but making use of it requires fixing the GIL.

My opinion on this (when talking about personal computers rather than
servers) is that:

(1)
Computers *appear* faster now because they have more cores - you can
have one doing the fancy GUI effects of Compiz etc. in the background,
while the other core actually does the work.

(2) 
Actual speedups aren't that related to either clock speed or cores at
the moment, they're related to the switch to 64-bit processors, the
massive increases in RAM and the increase in system bus speeds and other
IO (and of course graphics cards). I suspect that the next common
increase will be solid state hard disks.

e.g. I used to expect my computer to be paging all the time, although
I'd try to reduce it - these days I'm really upset when I see I've had
to page *anything* to disk!

Another massive increase (which I am willing to pay more for with the
work I do) is the processor cache - at first it was amazing when we got
significant level2 cache advertised on pc equipment, now I can fit
massive amounts of code into my 4mb level-2 cache *on my laptop*! That's
a huge impact for numerical work.

(3)
Multiple cores scale processing power linearly at best with the number
of cores (since you're normally going to be IO based at some point).
Perhaps the GIL will be relaxed a bit, but it's not going to have a
massive effect.

Tim Wintle




From Scott.Daniels at Acm.Org  Thu Feb 19 18:19:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 15:19:42 -0800
Subject: Threading and tkinter
In-Reply-To: <bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
	<mailman.234.1235039030.11746.python-list@python.org>
	<bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
Message-ID: <N-OdnZ7PF6nidQDUnZ2dnUVZ_haWnZ2d@pdx.net>

gert wrote:
> Hope you do not mind ignoring part of answers, so I can figure out
> more why things work the way they are.
> This two examples work, what i do not understand is that in function
> display i do not have to declare root, v or x ?
...
> 
> x=0
> def weegbrug():
>     global x
>     while True:
>         x=x+1
>         sleep(0.5)
> start_new_thread(weegbrug,())
> 
> def display():
>     v.set(x)
>     root.after(500, lambda:display())
1) Note that x, v, and root are read and manipulated, but not written.
    So, they do not need to be declared global (global is only needed
    to declare writable global names).
2) The last statement could more easily be written:
    root.after(500, display)
...
> root.after(500, lambda:display())
Again you can write this:
    root.after(500, display)

--Scott David Daniels
Scott.Daniels at Acm.Org


From mensanator at aol.com  Thu Feb 19 18:19:51 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 15:19:51 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>

On Feb 19, 2:18?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> sturlamolden <sturlamol... at yahoo.no> writes:
> > Yes, the GIL prevents Python threads from being used in a certain way.
> > But do you really need to use threads like that? Or do you just think
> > you do?
>
> How old is your computer, why did you buy it, and is it the first one
> you ever owned?
>
> For most of us, I suspect, it is not our first one, and we bought it
> to get a processing speedup relative to the previous one. ?If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.
>
> It used to be that new computers were faster than the old ones because
> they ran at higher clock rates. ?That was great, no software changes
> at all were required to benefit from the higher speed. ?Now, they get
> the additional speed by having more cores. ?That's better than nothing
> but making use of it requires fixing the GIL.

When I run I Python program, the Windows task manager shows both
cores running (usually a 60/40 split) for an overall 50% usage.

What am I actually seeing? If Python only uses one of the cores,
why do both light up? Is everything much more complicated (due to
OS scheduling, etc.) than the simple explanations of GIL?


From http  Thu Feb 19 18:20:51 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 15:20:51 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
Message-ID: <7xmyci3tf0.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> > That Python is so much slower than C is yet another area where Python
> > can use improvement.
> 
> No, because we don't use Python where C would be more appropriate.

C is basically never appropriate.  C should be outlawed by Congress
with the ban enforced by roving pie-throwing squads <wink>.  If a
Python program is too slow, making Python faster is far preferable to
switching to C.

> Sure nobody would complain if Python were faster, but it's not for
> speed that we choose Python. Not speed of /execution/ that is.

I would say, slow execution is a drawback that we put up with in order
to gain benefits of Python programming that are mostly unrelated to
the causes of the slowness.  The slowness itself can be addressed by
technical means, such as native-code compilation and eliminating the
GIL.  I believe (for example) that the PyPy project is doing both of
these.

> Different languages have different trade-offs. Python's trade-offs
> suit us. If they don't suit you, use a language with trade-offs that
> do.

I don't think Python's slowness is inherent in the language.  It's
mostly a shortcoming of the implementation that should be fixed like
any other such shortcoming.


From garrickp at gmail.com  Thu Feb 19 18:23:40 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 15:23:40 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <33017207-bc5c-45e5-8795-516329ac172c@p2g2000prf.googlegroups.com>

On Feb 19, 3:11?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Falcolas <garri... at gmail.com> writes:
> > It's a proposition that used to bother me, until I did some actual
> > programming of real world problems in Python. I've yet to really find
> > a case where the application was slow enough to justify the cost of
> > using multiple Python processes.
>
> Right, that's basically the issue here: the cost of using multiple
> Python processes is unnecessarily high. ?If that cost were lower then
> we could more easily use multiple cores to make oru apps faster.

I was actually referring to the time cost of researching or developing
a parallel execution algorithm which would be suitable for multiple
processes.

The system overhead of using the Python multiprocess module is fairly
negligible for the systems I work on.

> Different languages have different trade-offs. Python's trade-offs
> suit us. If they don't suit you, use a language with trade-offs that
> do.

+1

~G


From http  Thu Feb 19 18:29:40 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 15:29:40 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<mailman.299.1235083025.11746.python-list@python.org>
Message-ID: <7xiqn63t0b.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> > I really believe that GIL is a design error.
> It's only an error if it gets in the way. It's the experience of a lot
> of programmers that it doesn't, so it's not an error.

It does get in the way of quite a few of us, but I wouldn't exactly
call it an error.  It was a sensible decision at the time it was made.
Changing technology and changing requirements have turned it into a
problem since then.  

A sensible decision later becoming a problem is a fairly normal
occurrence, not just in software but in just about every area of human
endeavor.  The sensible response to the changed landscape is to
recognize the problem and figure out what to do about it.  Denying the
problem's existence is not sensible.


From Scott.Daniels at Acm.Org  Thu Feb 19 18:31:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 15:31:00 -0800
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <mailman.261.1235062412.11746.python-list@python.org>
References: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
	<mailman.261.1235062412.11746.python-list@python.org>
Message-ID: <-c2dnbTIibu4dgDUnZ2dnUVZ_vCdnZ2d@pdx.net>

Tim Wintle wrote:
> On Thu, 2009-02-19 at 11:50 -0500, Jean-Paul Calderone wrote: ...
>> (also, i before e *except* after c et cetera).  Flip 'em around and
>> all is well.
> 
> Thanks - never was great at speling :-)

I used to be great at spelling until I became a programmer.  Programming
rewards consistency in spelling over correctness.  Spelling "recievers"
the same way 1000 times is better than getting it correct 999 times and
"wrong" once. :-)

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Thu Feb 19 18:34:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 18:34:28 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <1235085392.21735.57.camel@tim-laptop>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<1235085392.21735.57.camel@tim-laptop>
Message-ID: <gnkqa4$dm7$1@ger.gmane.org>

Tim Wintle wrote:
> On Thu, 2009-02-19 at 12:18 -0800, Paul Rubin wrote:
>> If such
>> speedups were useless or unimportant, we would not have blown our hard
>> earned cash replacing perfectly good older hardware, so we have to
>> accept the concept that speed matters and ignore those platitudes that
>> say otherwise.
> 
> Kind of agree (although I use a netbook at lot at the moment, and I
> don't use that because of speed-ups!)
[...]
> (3)
> Multiple cores scale processing power linearly at best with the number
> of cores (since you're normally going to be IO based at some point).
> Perhaps the GIL will be relaxed a bit, but it's not going to have a
> massive effect.
> 
There are significant classes of problems which *are* compute bound, and
as computers are applied more and more to planning and design problems
it seems likely that kind of application will become more significant.

In twenty years time our laptops will probably be continually optimizing
aspects of our lives using advanced linear algebra algorithms over
matrices with hundreds or thousands of millions of elements. I wouldn't
like Python to be excluded from solving such problems, and others we
currently fail to foresee.

Though my own interest does tend to lie in the areas where interaction
of various kinds dominates the need for large chunks of processing
power, I can't ignore the obvious. Many compute-bound problems do exist,
and they are important.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Thu Feb 19 18:38:21 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 00:38:21 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <gnkqhd$e5j$1@ger.gmane.org>

Mensanator wrote:
> When I run I Python program, the Windows task manager shows both
> cores running (usually a 60/40 split) for an overall 50% usage.
> 
> What am I actually seeing? If Python only uses one of the cores,
> why do both light up? Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

A Python *program* can utilize more than one core, just Python *code*
can't run on multiple cores in parallel. Everytime a C function calls
code that doesn't use the Python API it can chose to release the GIL.
That way a Python program can wrap a library and use as many cores as
possible.

Christian



From steve at holdenweb.com  Thu Feb 19 18:45:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 18:45:30 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xmyci3tf0.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <gnkquq$fas$1@ger.gmane.org>

Paul Rubin wrote:
> Tim Rowe <digitig at gmail.com> writes:
>>> That Python is so much slower than C is yet another area where Python
>>> can use improvement.
>> No, because we don't use Python where C would be more appropriate.
> 
> C is basically never appropriate.  C should be outlawed by Congress
> with the ban enforced by roving pie-throwing squads <wink>.  If a
> Python program is too slow, making Python faster is far preferable to
> switching to C.
> 
Unfortunately it's also far more difficult. I speak with the experience
of the "Need for Speed" sprint behind me: the accumulated brainpower at
that event should have been able to pick all the low-hanging fruit, and
yet the resultant net speedup was worthwhile, but definitely not immense.

>> Sure nobody would complain if Python were faster, but it's not for
>> speed that we choose Python. Not speed of /execution/ that is.
> 
> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness.  The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL.  I believe (for example) that the PyPy project is doing both of
> these.
> 
And IronPython and JPython already have. (How many times do I have to
say this before somebody with access to decent multi-processor hardware
runs some actual benchmarks?  Where's snakebite.org when you need it? ;-)

>> Different languages have different trade-offs. Python's trade-offs
>> suit us. If they don't suit you, use a language with trade-offs that
>> do.
> 
> I don't think Python's slowness is inherent in the language.  It's
> mostly a shortcoming of the implementation that should be fixed like
> any other such shortcoming.

Reasonable, and true. Some people talk about the GIL as though it were
something other than an implementation artifact.

What Guido doesn't seem to have accepted yet is that slowing [C]Python
down by 50% on a single-processor CPU will actually be a worthwhile
tradeoff in ten years time, when nothing will have less than eight cores
and the big boys will be running at 64 kilo-cores.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb 19 18:52:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 23:52:12 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <1235082919.21735.30.camel@tim-laptop>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<1235082919.21735.30.camel@tim-laptop>
Message-ID: <499DF0AC.2030306@mrabarnett.plus.com>

Tim Wintle wrote:
[snip]
> Yes, we're coming to a point where we're going to have tens of cores in
> a chip, but by that time someone far cleverer than me (possibly someone
> who's on this list) will have solved that problem. The top experts in
> many fields use Python, and if they weren't able to make use of multiple
> core chips, then there wouldn't be any demand for them.
> 
Perhaps we should ask Guido who it is; after all, he's the one with the
time machine! :-)


From tjreedy at udel.edu  Thu Feb 19 18:58:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 19 Feb 2009 18:58:57 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xmyci3tf0.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <gnkrns$he0$1@ger.gmane.org>

Paul Rubin wrote:

> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness.  The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL.

Given that the GIL remains to make Python run faster in the usual (up to 
now, at least) case of 1 processor, that seems a strange statement.



From Scott.Daniels at Acm.Org  Thu Feb 19 19:01:34 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 16:01:34 -0800
Subject: Strange array.array performance
In-Reply-To: <mailman.278.1235073207.11746.python-list@python.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
Message-ID: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>

Maxim Khitrov wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case....
> The only feature that I'm missing with array.array is the ability to
> quickly pre-allocate large chunks of memory. To do that right now I'm
> using array('d', (0,) * size). It would be nice if array accepted an
> int as the second argument indicating how much memory to allocate and
> initialize to 0.

In the meantime, you could write a function (to ease the shift to numpy)
and reduce your interface problem to a very small set of lines:
     def zeroes_d(n):
         '''Allocate a n-element vector of 'd' elements'''
         vector = array.array('d') # fromstring has no performance bug
         vector.fromstring(n * 8 * '\0')
         return vector
Once numpy is up and running on 2.6, this should be easy to convert
to a call to zeroes.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Thu Feb 19 19:13:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:13:57 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <gnkrns$he0$1@ger.gmane.org>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<gnkrns$he0$1@ger.gmane.org>
Message-ID: <gnksk4$k0e$1@ger.gmane.org>

Terry Reedy wrote:
> Paul Rubin wrote:
> 
>> I would say, slow execution is a drawback that we put up with in order
>> to gain benefits of Python programming that are mostly unrelated to
>> the causes of the slowness.  The slowness itself can be addressed by
>> technical means, such as native-code compilation and eliminating the
>> GIL.
> 
> Given that the GIL remains to make Python run faster in the usual (up to
> now, at least) case of 1 processor, that seems a strange statement.
> 
>From a historical perspective, that's going to seem like a very
parochial PoV in (say) twenty years.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 19:15:22 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:15:22 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xiqn63t0b.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>	<mailman.299.1235083025.11746.python-list@python.org>
	<7xiqn63t0b.fsf@ruckus.brouhaha.com>
Message-ID: <gnksmq$k0e$2@ger.gmane.org>

Paul Rubin wrote:
> Tim Rowe <digitig at gmail.com> writes:
>>> I really believe that GIL is a design error.
>> It's only an error if it gets in the way. It's the experience of a lot
>> of programmers that it doesn't, so it's not an error.
> 
> [...]  Denying the
> problem's existence is not sensible.

And if wishes were horses then beggars would ride :-)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From http  Thu Feb 19 19:16:24 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 16:16:24 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.308.1235087951.11746.python-list@python.org>
Message-ID: <7xbpsyj73b.fsf@ruckus.brouhaha.com>

Terry Reedy <tjreedy at udel.edu> writes:
> > The slowness itself can be addressed by technical means, such as
> > native-code compilation and eliminating the GIL.
> 
> Given that the GIL remains to make Python run faster in the usual (up
> to now, at least) case of 1 processor, that seems a strange statement.

We've had this discussion before.  The 1-processor slowdown that you
refer to comes from replacing the GIL with the blunt instrument of a
lock around each reference count operation.  That has the advantage of
not breaking CPython in a million places, but has the drawback of
taking a big performance hit.  The long term fix is to replace
reference counts with a tracing GC.  That is apparently not feasible
in the framework of CPython and the many extension modules that have
been written for it, so it would have to be accompanied by an
implementation switch (e.g. PyPy).

Steve Holden has mentioned Jython and Ironpython a few times in this
thread.  Those are reasonable proofs of the concept of a GIL-less
Python, but for various reasons (spelled J-V-M and W-i-n-d-o-w-s) are
not all that suitable for many current Python users.


From steve at holdenweb.com  Thu Feb 19 19:17:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:17:12 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <499DF0AC.2030306@mrabarnett.plus.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<1235082919.21735.30.camel@tim-laptop>
	<499DF0AC.2030306@mrabarnett.plus.com>
Message-ID: <499DF688.2050303@holdenweb.com>

MRAB wrote:
> Tim Wintle wrote:
> [snip]
>> Yes, we're coming to a point where we're going to have tens of cores in
>> a chip, but by that time someone far cleverer than me (possibly someone
>> who's on this list) will have solved that problem. The top experts in
>> many fields use Python, and if they weren't able to make use of multiple
>> core chips, then there wouldn't be any demand for them.
>>
> Perhaps we should ask Guido who it is; after all, he's the one with the
> time machine! :-)

But he clearly hasn't been using it lately.

<heresy>Perhaps it's time Python stopped being a dictatorship?</heresy>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From wuwei23 at gmail.com  Thu Feb 19 19:44:18 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 19 Feb 2009 16:44:18 -0800 (PST)
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com> 
	<gnkceu$5i9$02$1@news.t-online.com>
Message-ID: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>

On Feb 20, 5:38?am, Peter Otten <__pete... at web.de> wrote:
> Yes you can get portions of the line by slicing:
>
> for line in open("infile"):
> ? ? if line[8:18] != line[18:28]:
> ? ? ? ? ? ? print line,

You can also name the slices, which makes the code more clear (IMO):

endda = slice(8,18)
begda = slice(18,28)
for line in open("infile"):
    if line[endda] != line[begda]:
            print line,

> Or you can use the struct module:

But this is the approach I'd take.


From steve at holdenweb.com  Thu Feb 19 20:18:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:18:32 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <gnl0d8$ss8$1@ger.gmane.org>

Mensanator wrote:
> On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
[...]
> When I run I Python program, the Windows task manager shows both
> cores running (usually a 60/40 split) for an overall 50% usage.
> 
> What am I actually seeing? If Python only uses one of the cores,
> why do both light up? Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

You are seeing your Python program running on one core, and the usual
Windows crap keeping the other one busy.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From brent.r.nash at jpl.nasa.gov  Thu Feb 19 20:22:53 2009
From: brent.r.nash at jpl.nasa.gov (Nash, Brent R)
Date: Thu, 19 Feb 2009 17:22:53 -0800
Subject: matplotlib issue: cannot auto-scale X axis of plop properly
Message-ID: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>

Hey everyone,

I'm fairly new to matplotlib, but have read through tons of the documentation today and have a decent understanding of it.  All the auto-scaling, xlim, and x_bound stuff works fine for me with the examples, but as soon as I try to use it on my data, it's not working for me.  I've attached a demo script, 2 input files of data, and a PNG showing the resulting chart I get.  The numbers on my Y-axis range from 7656 to 59928 (a difference of 52272) and the numbers on my X-axis range from 1.22896144017e+12 to 1.22896155012e+12 (a difference of 109950).

The plot should look like a monotonically increasing line, but the resulting plot always comes out looking like a vertical line.  I realize that the plot is actually correct, the problem is the default scaling on the ouptut.  The easy way to justify this to yourself is to take the line "ert = float(i)" in the script and replace it with "ert = float(i)  - 1228960000000" to reduce the ert #'s to a manageable size and then everything plots very nicely.  The data is all linear, not logarithmic or anything, so I don't think writing a custom scaler is the solution.

I left commented out sections in my script of all the different methods I've tried to scale this thing.  I've tried all permutations I could think of for the following functions:

matplotlib.pyplot.axes().autoscale_view(...)
matplotlib.pyplot.axes().set_xbound(...)
matplotlib.pyplot.axes().set_xlim(...)
matplotlib.pyplot.axes().set_aspect(...)
matplotlib.pyplot.axis(...)
matplotlib.pyplot.axes().set_xscale(...)

Can anyone catch what I'm doing wrong here?  I'm hoping it's just something obvious due to my unfamiliarity with the tool.

Is there any way to write my own custom autoscale algorithm?

Thanks very much for your time/help!

~Brent

PS ~ Here's my OS info:

MacBook Pro Laptop
Mac O X 10.5.6
2.6 GHz Intel Core 2 Duo
4GB 667 MHz DDR2 SDRAM
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From hellyj at ucsd.edu  Thu Feb 19 20:32:25 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 17:32:25 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-CE2288.11164519022009@ger.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
Message-ID: <454D3724-D479-4B73-8BFB-FDA9A8E54EE7@ucsd.edu>

Thanks very much.  I'll give it a go.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

On Feb 19, 2009, at 11:16 AM, Ned Deily wrote:

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory  
> of
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).
> That site-packages directory is /Library/Python/2.5. The Apple- 
> supplied
> python comes with a sym link from /usr/bin/python.  If you launch it,
> you'll probably find GDAL is there as expected.
>
> If you do want to use the python.org python, which is somewhat newer,
> you need to install its own version of setuptools/easy_install and use
> it to install GDAL to the site-packages directory of that python which
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site- 
> pack
> ages.  The two python instances co-exist.  To install another
  easy_install, ensure the python.org python comes first on your
> PATH, then follow the instructions here:
>   <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory
of the python.org python framework.  So to ensure you are using that
easy_install and that python, make sure that bin directory is on your
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin: 
$PATH"

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list



From mkhitrov at gmail.com  Thu Feb 19 20:39:08 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 20:39:08 -0500
Subject: Strange array.array performance
In-Reply-To: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
Message-ID: <26ddd1750902191739j5bcab830l865d6f04b869cd9a@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:01 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com>
>> wrote:
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case....
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size). It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> In the meantime, you could write a function (to ease the shift to numpy)
> and reduce your interface problem to a very small set of lines:
>    def zeroes_d(n):
>        '''Allocate a n-element vector of 'd' elements'''
>        vector = array.array('d') # fromstring has no performance bug
>        vector.fromstring(n * 8 * '\0')
>        return vector
> Once numpy is up and running on 2.6, this should be easy to convert
> to a call to zeroes.

If I do decide to transition at any point, it will require much
greater modification. For example, to speed-up retrieval of data from
Matlab, which is returned to me as an mxArray structure, I allocate an
array.array for it and then use ctypes.memmove to copy data directly
into the array's buffer (address obtained through buffer_info()).

Same thing for sending data, rather than allocate a separate mxArray,
copy data, and then send, I create an empty mxArray and set its data
pointer to the array's buffer. I'm sure that there are equivalents in
numpy, but the point is that the transition, which currently would not
benefit my code in any significant way, will not be a quick change.

On the other hand, I have to thank you for the fromstring example. For
some reason, it never occurred to me that creating a string of nulls
would be much faster than a tuple of zeros. In fact, you can pass the
string to the constructor and it calls fromstring automatically. For
an array of 1 million elements, using a string to initialize is 18x
faster. :)

- Max


From steve at holdenweb.com  Thu Feb 19 20:52:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:52:59 -0500
Subject: Newby Question for reading a file
In-Reply-To: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
	<gnkceu$5i9$02$1@news.t-online.com>
	<cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
Message-ID: <499E0CFB.2090203@holdenweb.com>

alex23 wrote:
> On Feb 20, 5:38 am, Peter Otten <__pete... at web.de> wrote:
>> Yes you can get portions of the line by slicing:
>>
>> for line in open("infile"):
>>     if line[8:18] != line[18:28]:
>>             print line,
> 
> You can also name the slices, which makes the code more clear (IMO):
> 
> endda = slice(8,18)
> begda = slice(18,28)
> for line in open("infile"):
>     if line[endda] != line[begda]:
>             print line,
> 
>> Or you can use the struct module:
> 
> But this is the approach I'd take.

This is one of the lesser-appreciated aspects of Python. I anticipate a
flood of "Named Slices" blog posts round about now. Wonder if I'll be
the first?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 20:52:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:52:59 -0500
Subject: Newby Question for reading a file
In-Reply-To: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
	<gnkceu$5i9$02$1@news.t-online.com>
	<cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
Message-ID: <499E0CFB.2090203@holdenweb.com>

alex23 wrote:
> On Feb 20, 5:38 am, Peter Otten <__pete... at web.de> wrote:
>> Yes you can get portions of the line by slicing:
>>
>> for line in open("infile"):
>>     if line[8:18] != line[18:28]:
>>             print line,
> 
> You can also name the slices, which makes the code more clear (IMO):
> 
> endda = slice(8,18)
> begda = slice(18,28)
> for line in open("infile"):
>     if line[endda] != line[begda]:
>             print line,
> 
>> Or you can use the struct module:
> 
> But this is the approach I'd take.

This is one of the lesser-appreciated aspects of Python. I anticipate a
flood of "Named Slices" blog posts round about now. Wonder if I'll be
the first?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mensanator at aol.com  Thu Feb 19 20:57:52 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 17:57:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<mailman.312.1235092727.11746.python-list@python.org>
Message-ID: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>

On Feb 19, 7:18?pm, Steve Holden <st... at holdenweb.com> wrote:
> Mensanator wrote:
> > On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> [...]
> > When I run I Python program, the Windows task manager shows both
> > cores running (usually a 60/40 split) for an overall 50% usage.
>
> > What am I actually seeing? If Python only uses one of the cores,
> > why do both light up? Is everything much more complicated (due to
> > OS scheduling, etc.) than the simple explanations of GIL?
>
> You are seeing your Python program running on one core, and the usual
> Windows crap keeping the other one busy.

I thought of that, but the usual Windows crap accounts for only a
couple percent prior to the Python program running. Christian Heimes
answer sounds more realistic.

But what do I know?

>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/



From mkhitrov at gmail.com  Thu Feb 19 21:08:43 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:08:43 -0500
Subject: Strange array.array performance
In-Reply-To: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
Message-ID: <26ddd1750902191808x329881e2lde249be20571ab06@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:01 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com>
>> wrote:
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case....
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size). It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> In the meantime, you could write a function (to ease the shift to numpy)
> and reduce your interface problem to a very small set of lines:
>    def zeroes_d(n):
>        '''Allocate a n-element vector of 'd' elements'''
>        vector = array.array('d') # fromstring has no performance bug
>        vector.fromstring(n * 8 * '\0')
>        return vector
> Once numpy is up and running on 2.6, this should be easy to convert
> to a call to zeroes.

Here's the function that I'll be using from now on. It gives me
exactly the behavior I need, with an int initializer being treated as
array size. Still not as efficient as it could be if supported
natively by array (one malloc instead of two + memmove + extra
function call), but very good performance nevertheless:

from array import array as _array
array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in 'cbBuhHiIlLfd')

def array(typecode, init):
	if isinstance(init, int):
		return _array(typecode, array_null[typecode] * init)
	return _array(typecode, init)

- Max


From sjmachin at lexicon.net  Thu Feb 19 21:15:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 19 Feb 2009 18:15:51 -0800 (PST)
Subject: Strange array.array performance
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com> 
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
Message-ID: <91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>

On Feb 20, 6:53?am, Maxim Khitrov <mkhit... at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.k... at gmail.com> wrote:
> > On 2009-02-19 12:52, Maxim Khitrov wrote:
>
> >> Hello all,
>
> >> I'm currently writing a Python<-> ?MATLAB interface with ctypes and
> >> array.array class, using which I'll need to push large amounts of data
> >> to MATLAB.
>
> > Have you taken a look at mlabwrap?
>
> > ?http://mlabwrap.sourceforge.net/
>
> > At the very least, you will probably want to use numpy arrays instead of
> > array.array.
>
> > ?http://numpy.scipy.org/
>
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case. Mlabwrap description doesn't mention if
> it is thread-safe, and that's another one of my requirements.
>
> The only feature that I'm missing with array.array is the ability to
> quickly pre-allocate large chunks of memory. To do that right now I'm
> using array('d', (0,) * size).

It would go somewhat faster if you gave it a float instead of an int.

> It would be nice if array accepted an
> int as the second argument indicating how much memory to allocate and
> initialize to 0.

While you're waiting for that to happen, you'll have to use the
fromstring trick, or another gimmick that is faster and is likely not
to use an extra temp 8Mb for a 1M-element array, as I presume the
fromstring does.

[Python 2.6.1 on Windows XP SP3]
[Processor: x86 Family 15 Model 36 Stepping 2 AuthenticAMD ~1994 Mhz]

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d',(0,)*
1000000)"
10 loops, best of 3: 199 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d',(0.,)*1000000)"
10 loops, best of 3: 158 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d');x.fromstring('\0'*8*1000000)"
10 loops, best of 3: 36 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d','\0'*8*1000000)"
10 loops, best of 3: 35.7 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "array
('d',(0.,))*1000000"
10 loops, best of 3: 19.5 msec per loop

HTH,
John


From lists at cheimes.de  Thu Feb 19 21:19:15 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 03:19:15 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>	<mailman.312.1235092727.11746.python-list@python.org>
	<0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
Message-ID: <gnl3v4$4nd$1@ger.gmane.org>

Mensanator wrote:
> I thought of that, but the usual Windows crap accounts for only a
> couple percent prior to the Python program running. Christian Heimes
> answer sounds more realistic.
> 
> But what do I know?

Be happy that your program makes use of both cores? :]

You can restrict your program from using more than one core by setting
the cpu affinity. On Windows the pywin32 packages wraps all necessary calls:


phandle = win32process.GetCurrentProcess()
win32process.SetProcessAffinityMask(phandle, mask)


Past week I've written a wrapper for the Linux syscalls
sched_setaffinity and friends. I may be able and allowed to release the
stuff in a few weeks.

Christian



From cournape at gmail.com  Thu Feb 19 21:34:48 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 20 Feb 2009 11:34:48 +0900
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
Message-ID: <5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:53 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
>> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>>
>>> Hello all,
>>>
>>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>>> array.array class, using which I'll need to push large amounts of data
>>> to MATLAB.
>>
>> Have you taken a look at mlabwrap?
>>
>>  http://mlabwrap.sourceforge.net/
>>
>> At the very least, you will probably want to use numpy arrays instead of
>> array.array.
>>
>>  http://numpy.scipy.org/
>
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case. Mlabwrap description doesn't mention if
> it is thread-safe, and that's another one of my requirements.

What do you mean by thread-safe ? Different threads calling the same
matlab engine handle ?

David


From steve at holdenweb.com  Thu Feb 19 21:36:07 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 21:36:07 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>	<mailman.312.1235092727.11746.python-list@python.org>
	<0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
Message-ID: <gnl4uo$6aq$1@ger.gmane.org>

Mensanator wrote:
> On Feb 19, 7:18 pm, Steve Holden <st... at holdenweb.com> wrote:
>> Mensanator wrote:
>>> On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> [...]
>>> When I run I Python program, the Windows task manager shows both
>>> cores running (usually a 60/40 split) for an overall 50% usage.
>>> What am I actually seeing? If Python only uses one of the cores,
>>> why do both light up? Is everything much more complicated (due to
>>> OS scheduling, etc.) than the simple explanations of GIL?
>> You are seeing your Python program running on one core, and the usual
>> Windows crap keeping the other one busy.
> 
> I thought of that, but the usual Windows crap accounts for only a
> couple percent prior to the Python program running. Christian Heimes
> answer sounds more realistic.
> 
> But what do I know?
> 
At least as much as I do, probably.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From hellyj at ucsd.edu  Thu Feb 19 21:38:07 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 18:38:07 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-CE2288.11164519022009@ger.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
Message-ID: <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>

Hi.

You are correct about finding the module, Ned.  Thanks for that  
although I don't understand why it works.  However, there are  
complications.

1. Using '/usr/bin/python' and 'from osgeo import gdal' works but  
throws an error the first time it's invoked.

NeptuneDesk.local:/Volumes/B2_160GB/PALSAR_200902/Geotiffs>/usr/bin/ 
python
Python 2.5.1 (r251:54863, Apr 15 2008, 22:57:26)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> from osgeo import gdal
Python(21061) malloc: *** error for object 0xa00696d8: Non-aligned  
pointer being freed
*** set a breakpoint in malloc_error_break to debug
 >>> from osgeo import gdal
 >>>

2. Since I'm trying to use gdal_merge.py this causes a second attempt  
within gdal_merge.py, after the error above, to be made with the old  
(now wrong) syntax:

try:
     from osgeo import gdal
except ImportError:
     osgeo import gdal

3.  I changed the gdal_merge.py code so it uses the correct syntax  
even after the error but then find that I get the original 'no module'  
error, I think, because gdal_merge.py starts with the line:

#!/usr/bin/env python

I don't understand this usage but when I run it alone (i.e., /usr/bin/ 
env) I see that it forces the PATH, and the environment in general, to  
be something different than what I have set in my .bash_profile.  For  
example, it puts

PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:

in the beginning in front of /usr/bin which I had moved up in the path  
in my .bash_profile.  I overcame this by getting rid of /usr/bin/env  
and substituting /usr/bin/python.

So, there are three issues:

1. the malloc error
2. the interaction with the gdal_merge.py error handling
3. the environment setup and where that's coming from.

Otherwise, everything's peachy.

Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

On Feb 19, 2009, at 11:16 AM, Ned Deily wrote:

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory  
> of
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).
> That site-packages directory is /Library/Python/2.5. The Apple- 
> supplied
> python comes with a sym link from /usr/bin/python.  If you launch it,
> you'll probably find GDAL is there as expected.
>
> If you do want to use the python.org python, which is somewhat newer,
> you need to install its own version of setuptools/easy_install and use
> it to install GDAL to the site-packages directory of that python which
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site- 
> pack
> ages.  The two python instances co-exist.  To install another
  easy_install, ensure the python.org python comes first on your
> PATH, then follow the instructions here:
>   <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory
of the python.org python framework.  So to ensure you are using that
easy_install and that python, make sure that bin directory is on your
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin: 
$PATH"

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list

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From mkhitrov at gmail.com  Thu Feb 19 21:43:08 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:43:08 -0500
Subject: Strange array.array performance
In-Reply-To: <5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
Message-ID: <26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>

On Thu, Feb 19, 2009 at 9:34 PM, David Cournapeau <cournape at gmail.com> wrote:
> On Fri, Feb 20, 2009 at 4:53 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
>>> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>>>
>>>> Hello all,
>>>>
>>>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>>>> array.array class, using which I'll need to push large amounts of data
>>>> to MATLAB.
>>>
>>> Have you taken a look at mlabwrap?
>>>
>>>  http://mlabwrap.sourceforge.net/
>>>
>>> At the very least, you will probably want to use numpy arrays instead of
>>> array.array.
>>>
>>>  http://numpy.scipy.org/
>>
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case. Mlabwrap description doesn't mention if
>> it is thread-safe, and that's another one of my requirements.
>
> What do you mean by thread-safe ? Different threads calling the same
> matlab engine handle ?

Yes, I may have a case where one thread is still sending data, while
another tries to close the connection, or two threads trying to close
the connection at the same time. In both cases, I need some parts of
the code to be atomic to prevent errors.

- Max


From johnforse at talktalk.net  Thu Feb 19 21:46:19 2009
From: johnforse at talktalk.net (John Forse)
Date: Fri, 20 Feb 2009 02:46:19 +0000
Subject: IDLE error on 3.0.1
Message-ID: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>

Occaisionally, if I mistype in python shell or try to copy & paste a  
line there, I get a permanent hang with the error below. It isn't  
corrected by quitting IDLE, but is put right with a restart.  I am  
running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
the same system with 2.5 &2.6.1 ?
Is there another way to prevent this?
Regards
John Forse

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From benjamin.kaplan at case.edu  Thu Feb 19 21:53:23 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 19 Feb 2009 21:53:23 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xbpsyj73b.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.308.1235087951.11746.python-list@python.org>
	<7xbpsyj73b.fsf@ruckus.brouhaha.com>
Message-ID: <ec96e1390902191853k617e69edt1636aca60bec1baa@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:16 PM, Paul Rubin <http> wrote:

> Terry Reedy <tjreedy at udel.edu> writes:
> > > The slowness itself can be addressed by technical means, such as
> > > native-code compilation and eliminating the GIL.
> >
> > Given that the GIL remains to make Python run faster in the usual (up
> > to now, at least) case of 1 processor, that seems a strange statement.
>
> We've had this discussion before.  The 1-processor slowdown that you
> refer to comes from replacing the GIL with the blunt instrument of a
> lock around each reference count operation.  That has the advantage of
> not breaking CPython in a million places, but has the drawback of
> taking a big performance hit.  The long term fix is to replace
> reference counts with a tracing GC.  That is apparently not feasible
> in the framework of CPython and the many extension modules that have
> been written for it, so it would have to be accompanied by an
> implementation switch (e.g. PyPy).
>
> Steve Holden has mentioned Jython and Ironpython a few times in this
> thread.  Those are reasonable proofs of the concept of a GIL-less
> Python, but for various reasons (spelled J-V-M and W-i-n-d-o-w-s) are
> not all that suitable for many current Python users.


Actually, Mono supports IronPython so it will work on M-a-c, L-i-n-u-x,
S-o-l-a-r-i-s, and possibly even W-i-i and P-l-a-y-s-t-a-t-i-o-n-3.




> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rNOSPAMon at flownet.com  Thu Feb 19 21:57:13 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 18:57:13 -0800
Subject: To unicode or not to unicode
Message-ID: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>

I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
mu at the beginning (it's pronounced micro-wiki).  It's working, except 
that I can't actually enter the name of the wiki into the wiki itself 
because the default unicode encoding on my Python installation is 
"ascii".  So I'm trying to decide on a course of action.  There seem to 
be three possibilities:

1.  Change the code to properly support unicode.  Preliminary 
investigations indicate that this is going to be a colossal pain in the 
ass.

2.  Change the default encoding on my Python installation to be latin-1 
or UTF8.  The disadvantage to this is that no one else will be able to 
run my code without making the same change to their installation, since 
you can't change default encodings once Python has started.

3.  Punt and spell it 'uwiki' instead.

I'm feeling indecisive so I thought I'd ask other people's opinion.  
What should I do?

rg


From mkhitrov at gmail.com  Thu Feb 19 21:58:42 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:58:42 -0500
Subject: Strange array.array performance
In-Reply-To: <91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>
Message-ID: <26ddd1750902191858p2b84cedeicbaebbe29cc9af42@mail.gmail.com>

On Thu, Feb 19, 2009 at 9:15 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 20, 6:53 am, Maxim Khitrov <mkhit... at gmail.com> wrote:
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.k... at gmail.com> wrote:
>> > On 2009-02-19 12:52, Maxim Khitrov wrote:
>>
>> >> Hello all,
>>
>> >> I'm currently writing a Python<->  MATLAB interface with ctypes and
>> >> array.array class, using which I'll need to push large amounts of data
>> >> to MATLAB.
>>
>> > Have you taken a look at mlabwrap?
>>
>> >  http://mlabwrap.sourceforge.net/
>>
>> > At the very least, you will probably want to use numpy arrays instead of
>> > array.array.
>>
>> >  http://numpy.scipy.org/
>>
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case. Mlabwrap description doesn't mention if
>> it is thread-safe, and that's another one of my requirements.
>>
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size).
>
> It would go somewhat faster if you gave it a float instead of an int.
>
>> It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> While you're waiting for that to happen, you'll have to use the
> fromstring trick, or another gimmick that is faster and is likely not
> to use an extra temp 8Mb for a 1M-element array, as I presume the
> fromstring does.
>
> [Python 2.6.1 on Windows XP SP3]
> [Processor: x86 Family 15 Model 36 Stepping 2 AuthenticAMD ~1994 Mhz]
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d',(0,)*
> 1000000)"
> 10 loops, best of 3: 199 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d',(0.,)*1000000)"
> 10 loops, best of 3: 158 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d');x.fromstring('\0'*8*1000000)"
> 10 loops, best of 3: 36 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d','\0'*8*1000000)"
> 10 loops, best of 3: 35.7 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "array
> ('d',(0.,))*1000000"
> 10 loops, best of 3: 19.5 msec per loop

Interesting, though I'm not able to replicate that last outcome. The
string method is still the fastest on my machine. Furthermore, it
looks like the order in which you do the multiplication also matters -
(8 * size * '\0') is faster than ('\0' * 8 * size). Here is my test
and outcome:

---
from array import array
from timeit import repeat

print repeat(lambda: array('d', (0,) * 100000), number = 100)
print repeat(lambda: array('d', (0.0,) * 100000), number = 100)
print repeat(lambda: array('d', (0.0,)) * 100000, number = 100)
print repeat(lambda: array('d', '\0' * 100000 * 8), number = 100)
print repeat(lambda: array('d', '\0' * 8 * 100000), number = 100)
print repeat(lambda: array('d', 8 * 100000 * '\0'), number = 100)
---

[0.91048107424534941, 0.88766983642377162, 0.88312824645684618]
[0.72164595848486179, 0.72038338197219343, 0.72346024633711981]
[0.10763947529894136, 0.1047547164728595, 0.10461521722863232]
[0.05856873793382178, 0.058508825334111947, 0.058361838698573365]
[0.057632016342657799, 0.057521392119007864, 0.057227118035289237]
[0.056006643320014149, 0.056331811311153501, 0.056187433215103333]

The array('d', (0.0,)) * 100000 method is a good compromise between
performance and amount of memory used, so maybe I'll use that instead.

- Max


From johnforse at talktalk.net  Thu Feb 19 22:00:01 2009
From: johnforse at talktalk.net (John Forse)
Date: Fri, 20 Feb 2009 03:00:01 +0000
Subject: Fwd: IDLE error on 3.0.1
References: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>
Message-ID: <3F795AB3-9BA5-4833-971C-9A442CEF7D7F@talktalk.net>


Regards
John



Begin forwarded message:

> From: John Forse <johnforse at talktalk.net>
> Date: 20 February 2009 02:46:19 GMT
> To: python-list at python.org
> Subject: IDLE error on 3.0.1
>
> Occaisionally, if I mistype in python shell or try to copy & paste a  
> line there, I get a permanent hang with the error below. It isn't  
> corrected by quitting IDLE, but is put right with a restart.  I am  
> running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
> the same system with 2.5 &2.6.1 ?
> Is there another way to prevent this?
> Regards
> John Forse
>
> IDLE cant bind TCP/IP port 8833 which is necessary to communicate  
> with it's python execution server. Either no networking is installed  
> on this computer or another process(another IDLE?) is using the  
> port. Run IDLE with the -n command line switch to start without a  
> sub-process and refer to help/IDLE Help 'Running without a sub- 
> process' for further details
>
PS I AM connected to the network at the time and Help/Idle help is  
greyed-out on my IDLE. I've tried entering -n to IDLE on the initial  
blank window, but it seems to make no difference to the problem. I  
don't understand what is happening.
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From nad at acm.org  Thu Feb 19 22:02:41 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 19:02:41 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
	<2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>
Message-ID: <nad-292E32.19024119022009@news.gmane.org>

In article <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269 at ucsd.edu>,
 "Helly John J." <hellyj at ucsd.edu> wrote:
>[...]
> 3.  I changed the gdal_merge.py code so it uses the correct syntax  
> even after the error but then find that I get the original 'no module'  
> error, I think, because gdal_merge.py starts with the line:
> 
> #!/usr/bin/env python
> 
> I don't understand this usage but when I run it alone (i.e., /usr/bin/ 
> env) I see that it forces the PATH, and the environment in general, to  
> be something different than what I have set in my .bash_profile.  For  
> example, it puts
> 
> PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:
> 
> in the beginning in front of /usr/bin which I had moved up in the path  
> in my .bash_profile.  I overcame this by getting rid of /usr/bin/env  
> and substituting /usr/bin/python.

See <http://en.wikipedia.org/wiki/Shebang_(Unix)>.

The idea behind /usr/bin/env usage is to allow scripts to get around 
absolute paths and to be able to find the interpreter for the script by 
using the search order of $PATH.  So, if the script with /usr/bin/env 
python was invoking the wrong python, it sounds like your $PATH wasn't 
really what you thought it was, despite changing your .bash_profile.  
Did you start a new terminal session or login shell?  What does "echo 
$PATH" say?

> So, there are three issues:
> 
> 1. the malloc error
> 2. the interaction with the gdal_merge.py error handling

No suggestions on the first two, other than to perhaps install 
easy_install and GDAL and friends using the python.org 2.5 and/or to ask 
in a more specialized forum.

> Otherwise, everything's peachy.

Good luck!

-- 
 Ned Deily,
 nad at acm.org



From cournape at gmail.com  Thu Feb 19 22:06:13 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 20 Feb 2009 12:06:13 +0900
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
	<26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
Message-ID: <5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>

On Fri, Feb 20, 2009 at 11:43 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>
> Yes, I may have a case where one thread is still sending data, while
> another tries to close the connection, or two threads trying to close
> the connection at the same time. In both cases, I need some parts of
> the code to be atomic to prevent errors.

That does not sound like the right approach, then. Matlab engine is
not thread safe in that sense:

http://www.mathworks.fr/support/solutions/data/1-YR98I.html?product=ML&solution=1-YR98I

cheers,

David


From hellyj at ucsd.edu  Thu Feb 19 22:07:57 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 19:07:57 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-292E32.19024119022009@news.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
	<2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>
	<nad-292E32.19024119022009@news.gmane.org>
Message-ID: <EC651CC6-2906-483D-A77A-BB6B28BE999C@ucsd.edu>

Thanks, Ned. Despite the problems, your help has given me something to  
work with.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 19, 2009, at 7:02 PM, Ned Deily wrote:

In article <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269 at ucsd.edu>,
"Helly John J." <hellyj at ucsd.edu> wrote:
> [...]
> 3.  I changed the gdal_merge.py code so it uses the correct syntax
> even after the error but then find that I get the original 'no module'
> error, I think, because gdal_merge.py starts with the line:
>
> #!/usr/bin/env python
>
> I don't understand this usage but when I run it alone (i.e., /usr/bin/
> env) I see that it forces the PATH, and the environment in general, to
> be something different than what I have set in my .bash_profile.  For
> example, it puts
>
> PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:
>
> in the beginning in front of /usr/bin which I had moved up in the path
> in my .bash_profile.  I overcame this by getting rid of /usr/bin/env
> and substituting /usr/bin/python.

See <http://en.wikipedia.org/wiki/Shebang_(Unix)>.

The idea behind /usr/bin/env usage is to allow scripts to get around
absolute paths and to be able to find the interpreter for the script by
using the search order of $PATH.  So, if the script with /usr/bin/env
python was invoking the wrong python, it sounds like your $PATH wasn't
really what you thought it was, despite changing your .bash_profile.
Did you start a new terminal session or login shell?  What does "echo
$PATH" say?

> So, there are three issues:
>
> 1. the malloc error
> 2. the interaction with the gdal_merge.py error handling

No suggestions on the first two, other than to perhaps install
easy_install and GDAL and friends using the python.org 2.5 and/or to ask
in a more specialized forum.

> Otherwise, everything's peachy.

Good luck!

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list



From nad at acm.org  Thu Feb 19 22:18:18 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 19:18:18 -0800
Subject: Fwd: IDLE error on 3.0.1
References: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>
	<3F795AB3-9BA5-4833-971C-9A442CEF7D7F@talktalk.net>
Message-ID: <nad-FF7C50.19181819022009@news.gmane.org>

In article <3F795AB3-9BA5-4833-971C-9A442CEF7D7F at talktalk.net>,
 John Forse <johnforse at talktalk.net> wrote:
> > Occaisionally, if I mistype in python shell or try to copy & paste a  
> > line there, I get a permanent hang with the error below. It isn't  
> > corrected by quitting IDLE, but is put right with a restart.  I am  
> > running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
> > the same system with 2.5 &2.6.1 ?
> > Is there another way to prevent this?
> > Regards
> > John Forse
> >
> > IDLE cant bind TCP/IP port 8833 which is necessary to communicate  
> > with it's python execution server. Either no networking is installed  
> > on this computer or another process(another IDLE?) is using the  
> > port. Run IDLE with the -n command line switch to start without a  
> > sub-process and refer to help/IDLE Help 'Running without a sub- 
> > process' for further details
> >
> PS I AM connected to the network at the time and Help/Idle help is  
> greyed-out on my IDLE. I've tried entering -n to IDLE on the initial  
> blank window, but it seems to make no difference to the problem. I  
> don't understand what is 
> happening.--------------------------------------------------------------------

The error message means that there is another IDLE still running so I 
assume you get this when you try to launch IDLE again after the first 
one hangs?  If the first IDLE is hung, there should be either an IDLE or 
Python icon in your dock and, if IDLE is not responding to menu items or 
type-ins, you should be able to cause it to quit by pressing Option 
while clicking on the icon in the dock and selecting Force Quit.

It would be very helpful if you could outline the steps to reproduce 
this (in particular, how you launch IDLE) and open an issue on the 
Python bug tracker: http://bugs.python.org/

-- 
 Ned Deily,
 nad at acm.org



From benjamin at python.org  Thu Feb 19 22:21:57 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 20 Feb 2009 03:21:57 +0000 (UTC)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <loom.20090220T031801-918@post.gmane.org>

Ron Garret <rNOSPAMon <at> flownet.com> writes:

> 
> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
> mu at the beginning (it's pronounced micro-wiki).  It's working, except 
> that I can't actually enter the name of the wiki into the wiki itself 
> because the default unicode encoding on my Python installation is 
> "ascii".  So I'm trying to decide on a course of action.  There seem to 
> be three possibilities:

You should never have to rely on the default encoding. You should explicitly
decode and encode data.

> 
> 1.  Change the code to properly support unicode.  Preliminary 
> investigations indicate that this is going to be a colossal pain in the 
> ass.

Properly handling unicode may be painful at first, but it will surely pay off in
the future.






From mkhitrov at gmail.com  Thu Feb 19 22:31:05 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 22:31:05 -0500
Subject: Strange array.array performance
In-Reply-To: <5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
	<26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
	<5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>
Message-ID: <26ddd1750902191931t148724bchc9fdb2d583f170f1@mail.gmail.com>

On Thu, Feb 19, 2009 at 10:06 PM, David Cournapeau <cournape at gmail.com> wrote:
> On Fri, Feb 20, 2009 at 11:43 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>>
>> Yes, I may have a case where one thread is still sending data, while
>> another tries to close the connection, or two threads trying to close
>> the connection at the same time. In both cases, I need some parts of
>> the code to be atomic to prevent errors.
>
> That does not sound like the right approach, then. Matlab engine is
> not thread safe in that sense:
>
> http://www.mathworks.fr/support/solutions/data/1-YR98I.html?product=ML&solution=1-YR98I
>
> cheers,
>
> David
>

"One option is to use MUTEXes around every call into the MATLAB
Engine" - that's exactly what I'm doing. Some setup work, like
creating mxArrays is done without a lock, but all eng* calls are
mutually exclusive. I've been doing a lot of my own testing, and so
far have seen no problems with this approach.

- Max


From dean.wheatley at gmail.com  Thu Feb 19 22:34:32 2009
From: dean.wheatley at gmail.com (dean.wheatley at gmail.com)
Date: Thu, 19 Feb 2009 19:34:32 -0800 (PST)
Subject: Matplotlib change xticks and retain xticks changing during zoom
Message-ID: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>

Hello,

I execute the following code:

try:
	from math import *
	import pylab as p
except:
	print "Couldn't import all dependent libraries"
	sys.exit()
dataLength = 100
data = [sin(2*pi*x/dataLength) for x in range(0,dataLength)]
p.plot(data)
p.show()


This produces a figure window. When I zoom in regions of the plot, the
xticks change correctly to the zoomed region.

This is in contrast to the effect of the following code:

try:
	from math import *
	import pylab as p
except:
	print "Couldn't import all dependent libraries"
	sys.exit()
dataLength = 100
data = [sin(2*pi*x/dataLength) for x in range(0,dataLength)]
p.plot(data)
newXTicks= [str(x/2.0) for x in p.xticks()[0]]
p.xticks(p.xticks()[0], newXTicks)
p.show()

This code produces tick marks [0, 10, 20, 30, 40, 50]. However when
zooming, the xtick marks do not adjust correctly to the zoomed
regions.


Your help on this issue would be great, thanks!


From timr at probo.com  Thu Feb 19 22:35:36 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 19 Feb 2009 19:35:36 -0800
Subject: Will multithreading make python less popular?
References: <mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <b69sp4pf68nil053ivcs52gq5g23v36g54@4ax.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:
>
>C is basically never appropriate.  C should be outlawed by Congress
>with the ban enforced by roving pie-throwing squads <wink>.

One of my favorite quotes:

   The last good thing written in C was Schubert's Ninth Symphony.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From notvalid2 at sbcglobal.net  Thu Feb 19 23:03:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 20:03:56 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
	<Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>
	<d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>
Message-ID: <XXpnl.14205$as4.8059@nlpi069.nbdc.sbc.com>

Mike Driscoll wrote:
> On Feb 19, 11:29 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> W. eWatson wrote:
>>> Eric_Dex... at msn.com wrote:
>>>> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>>>>> version is the choice for me. The other choice has unicode. Do I care?
>>>>> --
>>>>>                                 W. eWatson
>>>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>>>                      Web Page: <www.speckledwithstars.net/>
>>>> There is a good chance you don't care...  I think the other is for
>>>> internationalization...  best to look..  It would be easier to answer
>>>> the question if you said what you are going to do with it, and who
>>>> needed to use your software.  It's even possible that you might want
>>>> to try pygame depending on what you want to use it for and who the
>>>> audience is (and how good thier computers are)
>>>> http://pypi.python.org/simple/Dex%20Tracker/
>>> Thanks. I think I'll take the chance. Somewhat simple programming.
>>> Off I go to install it. It can always be un-installed.
>> Well, that was an interesting experience. It appears to have recompiled a
>> lot of stuff, and probably some libraries. IDLE is still with me as the way
>> to open py files. Apparently, if I want to get around IDLE, I may have to
>> install some other editor.
>>
>> --
>>                                 W. eWatson
>>
> 
> The compiling you are referring to is just making the py files into
> pyc files. This is normal and is a speed improvement. In fact, a lot
> of the scripts you write will create a pyc file when first run.
> 
> In other words, wxPython does not affect your Python install in any
> way other than making itself available as a 3rd party package (i.e.
> adding itself to the path), just like any other good 3rd party
> package. I'm not sure why you're even talking about IDLE...wxPython is
> a GUI toolkit, not an IDE.
> 
> Mike
Thanks. Yes, I finally discovered that the need here was not what I wanted 
afterall. Un-installed now.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Thu Feb 19 23:06:42 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 20:06:42 -0800
Subject: Keeping the Console Open with IDLE
Message-ID: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>

I'm using IDLE for editing, but execute programs directly. If there are 
execution or "compile" errors, the console closes before I can see what it 
contains. How do I prevent that?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jitu.icfai at gmail.com  Thu Feb 19 23:58:24 2009
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Fri, 20 Feb 2009 10:28:24 +0530
Subject: email varification using smtplib or any method
Message-ID: <ad2372b70902192058re1bd1abic5654b60ba6c3590@mail.gmail.com>

hello
here is my code for sending the mail, using this code email is going
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''    CODE
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
import smtplib
from time import strftime
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.Utils import COMMASPACE, formatdate


# Create message container - the correct MIME type is multipart/alternative.
msg = MIMEMultipart('alternative')
msg['Subject'] = " is sending the mail"
msg['From'] = 'jitu.icfai at myprivatedomain.com <jitu.icfai at domain.com>'
msg['Date'] = formatdate(localtime=True)
msg['To'] = 'jitu.icfai at gmail.com'

# Create the body of the message (a plain-text and an HTML version).
#text = "jitendra kya huy a!\nHow are you?\nHere is the link you
wanted:\nhttp://www.python.org"
html = """\
<html>
  <head></head>
  <body>
    <p>Hi!<br>
       How are you?<br>
       This mail is send by wjitenrda
       Here is the <a href="http://www.python.org">link</a> you wanted.
    </p>
  </body>
</html>
"""

part2 = MIMEText(html, 'html')


msg.attach(part2)

# Send the message via local SMTP server.
s = smtplib.SMTP('smtp.myprivatedomain.com <http://name.com>')
s.login("user","password")
s.sendmail(msg['From'], msg['To'], msg.as_string())
s.close()
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''    CODE  END
 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
using this code i am able to send the email , but problem is
when i am changing
msg['To'] = "wronguser at wrongdomain.comddsdjsdsdsjdh"
some wrong email then i am getting back failure notice in my inbox, which i
dont want..
is there any way so that i can identify wrong email during the run time
(when i am sending  the email)
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From michele.simionato at gmail.com  Fri Feb 20 00:22:49 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 19 Feb 2009 21:22:49 -0800 (PST)
Subject: "metaclass conflict" error: where is noconflict ?
References: <mailman.36.1235041220.11040.python-list@python.org> 
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com> 
	<mailman.289.1235077114.11746.python-list@python.org>
Message-ID: <ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>

On Feb 19, 9:58?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Ba... at lsi.com> wrote:
> > Hi,
>
> > I have a class derived from two parents (in blue below), which gives me the
> > following error:
>
> > $ python -u ./failover_pickle_demo09.py
> > Traceback (most recent call last):
> > ? File "./failover_pickle_demo09.py", line 291, in <module>
> > ? ? class ListControl(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> > ? ? metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases
> > Googling suggested I should add
> > from noconflict import classmaker
> > and
>
> > __metaclass__=classmaker()
> > to this class.
>
> > However, I don't seem able to find where to get the noconflict module from.
>
> > Do any of you where noconflict ?could be downloaded/installed from ?


It refers to this cookbook recipe:
http://code.activestate.com/recipes/204197/

See also the printed cookbook:

http://books.google.it/books?id=1Shx_VXS6ioC&pg=PA786&lpg=PA786&dq=python+cookbook+noconflict&source=bl&ots=BB413AZ8R7&sig=cnAB-E9rNFolHBEZQTIm_d4Mj3o&hl=it&ei=GT2eSfCtBdWa_gadppHYCw&sa=X&oi=book_result&resnum=2&ct=result#PPA786,M1

However, there is no module to download, and this is on purpose:
instead of blindly apply a "fix" one should
understand what the conflict is: then it is quite easy to
solve it by hand. The recipe discussion explains it all.


From mccredie at gmail.com  Fri Feb 20 00:42:08 2009
From: mccredie at gmail.com (Matimus)
Date: Thu, 19 Feb 2009 21:42:08 -0800 (PST)
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
Message-ID: <54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>

On Feb 19, 8:06?pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
> I'm using IDLE for editing, but execute programs directly. If there are
> execution or "compile" errors, the console closes before I can see what it
> contains. How do I prevent that?
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

Open a console window and type in the name of the script rather than
just double clicking on it. Or, you can terminate your script with a
'raw_input("press enter to quit")'.

Matt


From timr at probo.com  Fri Feb 20 01:37:10 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 19 Feb 2009 22:37:10 -0800
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
Message-ID: <ohjsp4tutkkncocmgd99of86dk5431c4u3@4ax.com>

"W. eWatson" <notvalid2 at sbcglobal.net> wrote:
>
>I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi 
>version is the choice for me. The other choice has unicode. Do I care?

Well, there's a subtle point that gives me an opportunity to point out a
lesser-known "feature" of the NT-based systems (XP, Vista, etc).

The core Win32 APIs on the NT-based systems are all Unicode.  When you call
an ANSI API, the system converts all of your ANSI strings to Unicode, then
calls the Unicode API, then converts any output strings back to ANSI.

So, there is, actually, a (small) performance advantage in using the
Unicode APIs instead of the ANSI APIs.

Unless you need your wx programs to run on Windows 98, I recommend you use
the Unicode version of wxPython.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steve at pearwood.info  Fri Feb 20 01:57:07 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 17:57:07 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
	<mailman.300.1235084038.11746.python-list@python.org>
Message-ID: <01ae49c5$0$20662$c3e8da3@news.astraweb.com>

Steve Holden wrote:

>> It's only an error if it gets in the way. It's the experience of a lot
>> of programmers that it doesn't, so it's not an error.
>> 
> And it's not a feature of the language, rather of one or two
> implementations. Neither JPython not IronPython use a GIL to the best of
> my knowledge, so you are still quite at liberty to use them.

I found this interesting benchmark on the relative speeds of CPython 2.3,
IronPython 0.1 and Jython 2.1. It's from six years ago, so not exactly
reporting on the state of the art, but it suggests to me that IronPython is
faster at the fundamentals but much slower at some things.

http://www.python.org/~jeremy/weblog/031209a.html


-- 
Steven



From s.selvamsiva at gmail.com  Fri Feb 20 02:03:35 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Fri, 20 Feb 2009 12:33:35 +0530
Subject: Levenshtein word comparison -performance issue
In-Reply-To: <gn631q$l5b$02$1@news.t-online.com>
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<mailman.9482.1234521740.3487.python-list@python.org>
	<gn631q$l5b$02$1@news.t-online.com>
Message-ID: <b423b9550902192303m1a508935u236e52549620aeaa@mail.gmail.com>

On Sat, Feb 14, 2009 at 3:01 PM, Peter Otten <__peter__ at web.de> wrote:

> Gabriel Genellina wrote:
>
> > En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <
> s.selvamsiva at gmail.com>
> > escribi?:
> >
> >> I need some help.
> >> I tried to find top n(eg. 5) similar words for a given word, from a
> >> dictionary of 50,000 words.
> >> I used python-levenshtein module,and sample code is as follow.
> >>
> >> def foo(searchword):
> >>     disdict={}
> >>     for word in self.dictionary-words:
> >>                    distance=Levenshtein.ratio(searchword,word)
> >>                    disdict[word]=distance
> >>     """
> >>      sort the disdict dictionary by values in descending order
> >>     """
> >>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
> >>
> >>     return similarwords[:5]
> >
> > You may replace the last steps (sort + slice top 5) by heapq.nlargest -
> at
> > least you won't waste time sorting 49995 irrelevant words...
> > Anyway you should measure the time taken by the first part (Levenshtein),
> > it may be the most demanding. I think there is a C extension for this,
> > should be much faster than pure Python calculations.
> >
>
> [I didn't see the original post]
>
> You can use the distance instead of the ratio and put the words into bins
> of
> the same length. Then if you find enough words with a distance <= 1 in the
> bin with the same length as the search word you can stop looking.
>
> You might be able to generalize this approach to other properties that are
> fast to calculate and guarantee a minimum distance, e. g. set(word).
>
> Peter
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Thank you all for your response,

[sorry,I was away for a while.]
I used functools,heapq modules but that helped me a little,
then i categorized the words depending on the length and
compares with a small set(each set 50000/4=12,500),
so now its taking quarter of time as compared to older method.

Further, can i use Thread to achieve parallel comparison ?,as i have little
knowledge on python-thread.
Will the following code achive parallelism?

thread1= threading.Thread(target=self.findsimilar,
args=("1",searchword,dic-word-set1)
                   thread2= threading.Thread(target=self.findsimilar,
args=("2",searchword,dic-word-set1)
                   thread3= threading.Thread(target=self.findsimilar,
args=("3",searchword,dic-word-set1)
                   thread1.start()
                   thread2.start()
                   thread3.start()
                   thread1.join()
                   thread2.join()
                   thread3.join()

I would like to hear suggestion.
Note:The issue is i am developing spell checker for my local languge,i may
use more than 2.5 lakh words,so i need to have a best way to find out
alternative wordlist
-- 
Yours,
S.Selvam
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From steve at pearwood.info  Fri Feb 20 02:11:26 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:11:26 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <01ae4d21$0$20647$c3e8da3@news.astraweb.com>

Paul Rubin wrote:

> How old is your computer, why did you buy it, and is it the first one
> you ever owned?
> 
> For most of us, I suspect, it is not our first one, and we bought it
> to get a processing speedup relative to the previous one. 

My computer is about eight months old, and I bought it because the previous
one died.


> If such 
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, 

Oh the assumptions in that statement...

"Blowing hard-earned cash" assumes that people buy computers only when they
need to. That's certainly not true -- there's a lot of irrational purchases
involved. I have a friend who has just recently spent $2000 on storage so
he can store more games and videos, which he cheerfully admits he'll never
play or watch. He describes it as his "dragon's horde": it is for knowing
it's there, not for using.

Often hardware is upgraded because it's broken, or because you can't get
parts, or because the software you need will only run on newer machines. I
say *newer* rather than *faster*, because speed is only sometimes a factor
in why software won't run on old machines. My old Mac running a 68030 in
1990 ran Microsoft Word perfectly fast enough for even advanced word
processing needs, and nearly twenty years later, there's nothing I need
from a word processor that I couldn't do in 1990.


> so we have to 
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

The *perception* that speed matters, matters. The reality is that the
majority of computing tasks outside of certain specialist niches are I/O
bound, not CPU. Office server software is rarely CPU bound, and when it is,
in my experience there's one rogue process using all the CPU: the software
is broken, and a faster CPU would just let it be broken at a faster speed.

Gamers need better graphics cards and more memory, not faster CPUs. Internet
surfers need faster ethernet, more bandwidth and more memory, not faster
CPUs. Graphics designers need bigger hard drives and more memory, not
faster CPUs. (Hmm. There seems to be a pattern there...)

Of course, there are a few niches that do require faster CPUs: video
editing, some (but by no means all) Photoshop filters, number crunching,
etc. But even for them, you can often get more bang-for-your-buck
performance increase by adding more memory.

Speaking for myself, I'd happily take a 20% slower CPU for more reliable,
faster DVD/CD burning. What do I care if it takes my computer 120ms to open
a window instead of 100ms, but I care a lot if it takes me 10 minutes to
make a coaster instead of 7 minutes to make a good disc.



-- 
Steven



From steve at pearwood.info  Fri Feb 20 02:19:14 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:19:14 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.306.1235087140.11746.python-list@python.org>
Message-ID: <01ae4ef4$0$20660$c3e8da3@news.astraweb.com>

Steve Holden wrote:

> What Guido doesn't seem to have accepted yet is that slowing [C]Python
> down by 50% on a single-processor CPU will actually be a worthwhile
> tradeoff in ten years time, when nothing will have less than eight cores
> and the big boys will be running at 64 kilo-cores.

Ten years?

There's no guarantee that Python will still even be around in ten years. It
probably will be, I see no reason why it won't, but who knows? Maybe we'll
have mandatory software warranties tailored to suit the Microsofts and
Apples, and Guido and the PSF will be forced to abandon the language.

I think a design mistake would be to hamstring Python now for a hypothetical
benefit in a decade. But, well, in five years time, or three? Don't know.


-- 
Steven



From steve at pearwood.info  Fri Feb 20 02:19:45 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:19:45 +1100
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.277.1235073073.11746.python-list@python.org>
Message-ID: <01ae4f13$0$20660$c3e8da3@news.astraweb.com>

andrew cooke wrote:

> 
> i wonder what fraction of people posting with "bug?" in their titles here
> actually find bugs?

About 99.99%.

Unfortunately, 99.98% have found bugs in their code, not in Python.


-- 
Steven



From clp2 at rebertia.com  Fri Feb 20 02:35:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 23:35:50 -0800
Subject: CSV readers and UTF-8 files
In-Reply-To: <59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>
References: <mailman.252.1235053288.11746.python-list@python.org>
	<59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>
Message-ID: <50697b2c0902192335w51f03c23vcedd12dbd1567dd0@mail.gmail.com>

On Thu, Feb 19, 2009 at 8:11 AM, Falcolas <garrickp at gmail.com> wrote:
> On Feb 19, 7:21 am, mk <mrk... at gmail.com> wrote:
>> Hello everyone,
>>
>> Is it just me or CSV reader/DictReader and UTF-8 files do not work
>> correctly in Python 2.6.1 (Windows)?
>
> I would point out in the CSV module documentation (http://
> docs.python.org/library/csv.html) it explicitly mentions that it can't
> handle unicode.
>
> You can use their workaround in the examples section for UTF-8, or
> with another form of encoding (I used MIME) for UTF-16.
>
> ~G

This really ought to be fixed for 3.0+ (seems to still be ASCII-only
according to the 3.0 docs...)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Fri Feb 20 02:42:16 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 20 Feb 2009 09:42:16 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org><90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
	<mailman.234.1235039030.11746.python-list@python.org>
	<bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
Message-ID: <000e01c99332$bdc19c80$0d00a8c0@hendrik>

 "gert" <ger...ns at gmail.com>

> Hope you do not mind ignoring part of answers, so I can figure out
> more why things work the way they are.
> This two examples work, what i do not understand is that in function
> display i do not have to declare root, v or x ?
> 

x is easy - it was declared outside, in module scope, and you 
modified it after declaring it global.

The others are more subtle, and have to do with how the interpreter
searches for stuff  - first in the local scope, then up the stack in
the callers scope, up to finally in the module global scope.

That also explains why, if it is not found, you get an error message that
says "Global variable xxxxx not defined" (try it and see)

- Hendrik



From Scott.Daniels at Acm.Org  Fri Feb 20 02:42:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 23:42:19 -0800
Subject: Strange array.array performance
In-Reply-To: <mailman.317.1235095727.11746.python-list@python.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>	<gnkcah$rqa$1@ger.gmane.org>	<mailman.278.1235073207.11746.python-list@python.org>	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
	<mailman.317.1235095727.11746.python-list@python.org>
Message-ID: <w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>

Maxim Khitrov wrote:
> ... Here's the function that I'll be using from now on. It gives me
> exactly the behavior I need, with an int initializer being treated as
> array size. Still not as efficient as it could be if supported
> natively by array (one malloc instead of two + memmove + extra
> function call), but very good performance nevertheless:
> 
> from array import array as _array
> array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in 'cbBuhHiIlLfd')
How about:
   array_null = dict((tc, _array(tc, (0,)).tostring() for tc in 
'cbBuhHiIlLfd')
...
(some ancient floating points did not use all-0 bytes for 0.0).

--Scott David Daniels
Scott.Daniels at Acm.Org


From robin at alldunn.com  Fri Feb 20 02:44:54 2009
From: robin at alldunn.com (Robin Dunn)
Date: Thu, 19 Feb 2009 23:44:54 -0800
Subject: ANN:  wxPython 2.8.9.2 release
Message-ID: <499E5F76.2080803@alldunn.com>

The wxWidgets team is in the early stages of preparing for a 2.8.10
release, but I already had a set of 2.8.9.2 release candidate files
that I made a few days ago.  Since it's still possible that there
could be delays in the 2.8.10 release I thought that it would be nice
to go ahead and release the 2.8.9.2 binaries.  So...


Announcing
----------

The 2.8.9.2 release of wxPython is now available for download at
http://wxpython.org/download.php.  This release adds the wx.lib.agw
package, adds an event watcher to the widget inspection tool, and
fixes a bunch of bugs.  A summary of changes is listed below and also
at http://wxpython.org/recentchanges.php.

Source code is available as a tarball and a source RPM, as well as
binaries for Python 2.4, 2.5 and 2.6[1], for Windows and Mac, as well
some packages for various Linux distributions.


[1] If installing the Python 2.6 version of wxPython on 64-bit XP or
Vista then please read the README presented by the installer for
instructions on how to enable the themed controls.  (If anybody has a
better solution for this please let Robin know.)



What is wxPython?
-----------------

wxPython is a GUI toolkit for the Python programming language. It
allows Python programmers to create programs with a robust, highly
functional graphical user interface, simply and easily. It is
implemented as a Python extension module that wraps the GUI components
of the popular wxWidgets cross platform library, which is written in
C++.

wxPython is a cross-platform toolkit. This means that the same program
will usually run on multiple platforms without modifications.
Currently supported platforms are 32-bit and 64-bit Microsoft Windows,
most Linux or other Unix-like systems using GTK2, and Mac OS X 10.4+.
In most cases the native widgets are used on each platform to provide
a 100% native look and feel for the application.



Changes in 2.8.9.2
------------------

Added the wx.lib.agw package, which contiains most of the widgets from
http://xoomer.alice.it/infinity77/main/freeware.html written by Andrea
Gavana.  Andrea's widgets that were already in wx.lib were also moved
to the wx.lib.agw package, with a small stub module left in wx.lib.
As part of this addition the demo framework was given the ability to
load demo modules from a sub-folder of the demo directory, to make it
easier to maintain collections of demo samples as a group.

Added the wx.PyPickerBase class which can be used to derive new picker
classes in Python.  Used it to implement a color picker for Mac that
uses a wx.BitmapButton instead of a normal wx.Button.  This makes the
color picker look and behave lots better on Mac than before.

You can now pass the handler function to the Unbind method.  If it is
given then Unbind will only disconenct the event handler that uses the
same handler function, so if there are multiple bindings for the same
event type you'll now be able to selectively unbind specific
instances.

Added a new tool to the Widget Inspection Tool that allows you to watch
the events passing through a widget.  It can also be used
independently, see wx.lib.eventwatcher.



-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!



From mail at microcorp.co.za  Fri Feb 20 03:04:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 20 Feb 2009 10:04:39 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<1235082919.21735.30.camel@tim-laptop><499DF0AC.2030306@mrabarnett.plus.com>
	<499DF688.2050303@holdenweb.com>
Message-ID: <000f01c99332$be58ac60$0d00a8c0@hendrik>

"Steve Holden" <ste... at ..web.com> wrote:

> <heresy>Perhaps it's time Python stopped being a dictatorship?</heresy>

This will need a wholesale switch to the worship of Freya - It is rumoured
that She is capable of herding cats.

- Hendrik



From bj_666 at gmx.net  Fri Feb 20 03:08:36 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 20 Feb 2009 08:08:36 GMT
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org>
Message-ID: <7076o4Fn42niU1@mid.uni-berlin.de>

On Thu, 19 Feb 2009 13:56:38 -0800, oamram wrote:

> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one
> file that will contain all lines).

Untested:

from __future__ import with_statement
from glob import glob
from itertools import islice


def main():
    with open('result.txt', 'w') as out_file:
        for filename in glob('foo/*.txt'):
            with open(filename, 'r') as lines:
                out_file.writelines(islice(lines, 7, 12))


if __name__ == "__main__":
    main()


Ciao,
	Marc 'BlackJack' Rintsch


From astan.chee at al.com.au  Fri Feb 20 03:50:08 2009
From: astan.chee at al.com.au (Astan Chee)
Date: Fri, 20 Feb 2009 19:50:08 +1100
Subject: get most common number in a list with tolerance
Message-ID: <499E6EC0.8090509@al.com.au>

Hi,
I have a list that has a bunch of numbers in it and I want to get the 
most common number that appears in the list. This is trivial because i 
can do a max on each unique number. What I want to do is to have a 
tolerance to say that each number is not quite unique and if the 
difference from other numbers is small, than it can be counted together. 
This is what I have to get the common number (taken from the internet 
somewhere):

l = [10,30,20,20,11,12]
d = {}
tolerance = 5
for elm in l:
    d[elm] = d.get(elm, 0) + 1
counts = [(j,i) for i,j in d.items()]



This of course returns a list where each of them is unique

[(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]

but I am expecting a list that looks like this:

[(3, 10), (2, 20), (1, 30)]

What do I need to add?
Thanks for any help.
Cheers
Astan


From rushenaly at gmail.com  Fri Feb 20 04:25:43 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Fri, 20 Feb 2009 01:25:43 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org> 
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <ab85583b-d131-4745-b1f5-38ca7bee5fce@v39g2000yqm.googlegroups.com>

On 20 ?ubat, 01:20, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:

> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness. ?The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL. ?I believe (for example) that the PyPy project is doing both of
> these.

Do you believe that there is an effort for removing gil with pypy.
As i know there is not an intend to remove gil with pypy. GIL will
be possibly used in PyPy. There is a mistake in your reply or mine.

Thank you
Rushen


From grflanagan at gmail.com  Fri Feb 20 05:15:42 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Fri, 20 Feb 2009 10:15:42 +0000
Subject: get most common number in a list with tolerance
In-Reply-To: <499E6EC0.8090509@al.com.au>
References: <499E6EC0.8090509@al.com.au>
Message-ID: <gnlvsf$5j7$1@ger.gmane.org>

Astan Chee wrote:
> Hi,
> I have a list that has a bunch of numbers in it and I want to get the 
> most common number that appears in the list. This is trivial because i 
> can do a max on each unique number. What I want to do is to have a 
> tolerance to say that each number is not quite unique and if the 
> difference from other numbers is small, than it can be counted together. 
> This is what I have to get the common number (taken from the internet 
> somewhere):
> 
> l = [10,30,20,20,11,12]
> d = {}
> tolerance = 5
> for elm in l:
>    d[elm] = d.get(elm, 0) + 1
> counts = [(j,i) for i,j in d.items()]
> 
> 
> 
> This of course returns a list where each of them is unique
> 
> [(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]
> 
> but I am expecting a list that looks like this:
> 
> [(3, 10), (2, 20), (1, 30)]
> 

Maybe check for this number: tolerance * ( X / tolerance)

or a variation if tolerance is non-integer?

Eg. (rough):


from itertools import groupby


def tmax(seq, alpha):
     longest = []
     for k, g in groupby(sorted(seq), lambda x: alpha * (x / alpha)):
         g = list(g)
         if len(g) > len(longest):
             longest = g
     return longest[0]

a = [10, 30, 20, 20, 11, 12]


assert tmax(a, 5) == 10
assert tmax(a, 1) == 20




From sturlamolden at yahoo.no  Fri Feb 20 05:36:14 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Fri, 20 Feb 2009 02:36:14 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com>

On Feb 20, 12:19 am, Mensanator <mensana... at aol.com> wrote:

> What am I actually seeing? If Python only uses one of the cores,
> why do both light up?

Because of OS scheduling. You have more than one process running. The
Python process does not stay on one core. Try to put CPython into a
tight loop ("while 1: pass"). You will see ~50% use of both cores. If
you had 4 cores, you would see ~25% use.


> Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

No. Your Python code cannot use more than one core simultaneously.
It's just that scheduling happens so fast and so often that you don't
notice it.







From nick at craig-wood.com  Fri Feb 20 06:31:54 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 20 Feb 2009 05:31:54 -0600
Subject: How do I declare global vars or class vars in Python ?
References: <mailman.114.1234882494.11746.python-list@python.org>
Message-ID: <slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>

Linuxguy123 <linuxguy123 at gmail.com> wrote:
>  How do I do this in Python ?
> 
>  #############################
>  declare A,B
> 
>  function getA
>      return A
> 
>  function getB
>      return B
> 
>  function setA(value)
>       A = value
> 
>  function setB(value)
>       B = value
> 
>  main()
>      getA
>      getB
>      dosomething
>      setA(aValue)
>      setB(aValue)
>  ############################
> 
>  The part I don't know to do is declare the variables, either as globals
>  or as vars in a class.  How is this done in Python without setting them
>  to a value ?

Variables can have any value in python so if you want to pre-declare
then you set them to None normally.

As a class :-

class Stuff(object):
    def __init__(self):
        self.A = None
        self.B = None
    def getA(self):
        return self.A
    def getB(self):
        return self.B
    def setA(self, value):
        self.A = value
    def setB(self, value):
        self.B = value

>>> a = Stuff()
>>> print a.getA()
None
>>> print a.getB()
None
>>> # dosomething
... a.setA("aValue")
>>> a.setB("aValue")
>>> print a.getA()
aValue
>>> print a.getB()
aValue
>>> 

Note that in python we don't normally bother with getA/setA normally,
just use self.A, eg

class Stuff(object):
    def __init__(self):
        self.A = None
        self.B = None
    def main(self):
        print self.A
        print self.B
        # dosomething
        self.A = "aValue"
        self.B = "aValue"
        print self.A
        print self.B

>>> a = Stuff()
>>> a.main()
None
None
aValue
aValue
>>>  

If you need (later) A to be a computed value then you turn it into a
property, which would look like this.  (Note the main method is
identical to that above).

class Stuff(object):
    def __init__(self):
        self._A = None
        self.B = None
    def _getA(self):
        print "Getting A"
        return self._A
    def _setA(self, value):
        print "Setting A"
        self._A = value
    A = property(_getA, _setA)
    def main(self):
        print self.A
        print self.B
        # dosomething
        self.A = "aValue"
        self.B = "aValue"
        print self.A
        print self.B

>>> a = Stuff()
>>> a.main()
Getting A
None
None
Setting A
Getting A
aValue
aValue
>>>  

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 07:13:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 10:13:59 -0200
Subject: email varification using smtplib or any method
References: <ad2372b70902192058re1bd1abic5654b60ba6c3590@mail.gmail.com>
Message-ID: <op.upnf9l2ax6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 02:58:24 -0200, jitendra gupta <jitu.icfai at gmail.com>  
escribi?:

> when i am changing
> msg['To'] = "wronguser at wrongdomain.comddsdjsdsdsjdh"
> some wrong email then i am getting back failure notice in my inbox,  
> which i
> dont want..
> is there any way so that i can identify wrong email during the run time
> (when i am sending  the email)

In practice, no, due to spam.
If you connect directly to the destination SMTP (instead of your own), you  
could try the VRFY command (if supported by the server); but most servers  
just return a generic 252 response.

-- 
Gabriel Genellina



From mkhitrov at gmail.com  Fri Feb 20 07:23:09 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 20 Feb 2009 07:23:09 -0500
Subject: Strange array.array performance
In-Reply-To: <w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
	<mailman.317.1235095727.11746.python-list@python.org>
	<w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>
Message-ID: <26ddd1750902200423k6ede957arf6976ced8e835e01@mail.gmail.com>

On Fri, Feb 20, 2009 at 2:42 AM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> ... Here's the function that I'll be using from now on. It gives me
>> exactly the behavior I need, with an int initializer being treated as
>> array size. Still not as efficient as it could be if supported
>> natively by array (one malloc instead of two + memmove + extra
>> function call), but very good performance nevertheless:
>>
>> from array import array as _array
>> array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in
>> 'cbBuhHiIlLfd')
>
> How about:
>  array_null = dict((tc, _array(tc, (0,)).tostring() for tc in
> 'cbBuhHiIlLfd')
> ...
> (some ancient floating points did not use all-0 bytes for 0.0).

Didn't know that, thanks. I actually got rid of the dict, since
benchmarks showed access time to itemsize in the function itself is
not any slower than dict access. After going through all the different
speed tests yesterday the function now looks like this:

from array import array as _array

def array(typecode, init):
	if isinstance(init, int):
		a = _array(typecode, (0,))

		if a.itemsize * init > 1048576:
			return a * init
		else:
			a.fromstring((init - 1) * a.tostring())
			return a

	return _array(typecode, init)

This uses the fast fromstring operation when creating an array that is
less than 1MB in size. Over that, array multiplication is used, which
is slower, but doesn't require the extra memory.

- Max


From notvalid2 at sbcglobal.net  Fri Feb 20 07:30:21 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 04:30:21 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
Message-ID: <Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>

Matimus wrote:
> On Feb 19, 8:06 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> I'm using IDLE for editing, but execute programs directly. If there are
>> execution or "compile" errors, the console closes before I can see what it
>> contains. How do I prevent that?
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> Open a console window and type in the name of the script rather than
> just double clicking on it. Or, you can terminate your script with a
> 'raw_input("press enter to quit")'.
> 
> Matt
I can open the Python command line from Start, but how do I navigate to the 
folder where the program is?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From lie.1296 at gmail.com  Fri Feb 20 08:03:50 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 20 Feb 2009 13:03:50 +0000 (UTC)
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<gnkdal$bcq$01$1@news.t-online.com>
	<rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net>
Message-ID: <gnm9nl$34p$1@ger.gmane.org>

On Thu, 19 Feb 2009 13:03:59 -0800, Ron Garret wrote:

> In article <gnkdal$bcq$01$1 at news.t-online.com>,
>  Peter Otten <__peter__ at web.de> wrote:
> 
>> Ron Garret wrote:
>> 
>> > I'm trying to split a CamelCase string into its constituent
>> > components.
>> 
>> How about
>> 
>> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
>> ['foo', 'Bar', 'Baz']
> 
> That's very clever.  Thanks!
> 
>> > (BTW, I tried looking at the source code for the re module, but I
>> > could not find the relevant code.  re.split calls
>> > sre_compile.compile().split, but the string 'split' does not appear
>> > in sre_compile.py.  So where does this method come from?)
>> 
>> It's coded in C. The source is Modules/sremodule.c.
> 
> Ah.  Thanks!
> 
> rg

This re.split() doesn't consume character:

>>> re.split('([A-Z][a-z]*)', 'fooBarBaz')
['foo', 'Bar', '', 'Baz', '']

it does what the OP wants, albeit with extra blank strings. 



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 08:04:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 14:04:15 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
Message-ID: <499eaa34$0$21372$426a74cc@news.free.fr>

Nick Craig-Wood a ?crit :
(snip)
> Note that in python we don't normally bother with getA/setA normally,
> just use self.A, eg
> 
> class Stuff(object):
>     def __init__(self):
>         self.A = None
>         self.B = None
>     def main(self):
>         print self.A
>         print self.B
>         # dosomething
>         self.A = "aValue"
>         self.B = "aValue"
>         print self.A
>         print self.B
> 
>>>> a = Stuff()
>>>> a.main()
> None
> None
> aValue
> aValue
>>>>  
> 
> If you need (later) A to be a computed value then you turn it into a
> property, which would look like this.  (Note the main method is
> identical to that above).
> 
> class Stuff(object):
>     def __init__(self):
>         self._A = None

Note that while you *can* do direct access to the implementation 
attribute (here, '_A' for property 'A'), you don't *need* to so (and 
usually shouldn't - unless you have a very compelling reason).


From alainpoint at yahoo.fr  Fri Feb 20 08:12:03 2009
From: alainpoint at yahoo.fr (alain)
Date: Fri, 20 Feb 2009 05:12:03 -0800 (PST)
Subject: import bug?
Message-ID: <b2f8933f-3f8b-4896-89d8-20dc642addea@v15g2000vbb.googlegroups.com>

Hi all,

Running python 2.5, i experience a strange behaviour with the
following code:import imputil

def handle_pye(fullpath, fileinfo, name):
    # Print a debugging message
    print 'Importing "%s" from "%s"' % (name,fullpath)
    data = open(fullpath).read()
    return 0, compile(data,fullpath,'exec'),{}

im = imputil.ImportManager()
im.add_suffix('.pye',handle_pye)
im.install()  # THIS SEEMS TO DO WEIRD THINGS TO SUBSEQUENT
IMPORTS !!!!

import functools

I then get the following traceback:
Traceback (most recent call last):
  File "D:\deleteme\New1.py", line 12, in <module>
    import functools
  File "C:\Python25\lib\imputil.py", line 103, in _import_hook
    top_module = self._import_top_module(parts[0])
  File "C:\Python25\lib\imputil.py", line 190, in _import_top_module
    module = self.fs_imp.import_from_dir(item, name)
  File "C:\Python25\lib\imputil.py", line 545, in import_from_dir
    return self._process_result(result, fqname)
  File "C:\Python25\lib\imputil.py", line 304, in _process_result
    exec code in module.__dict__
  File "C:\Python25\lib\functools.py", line 10, in <module>
    from _functools import partial
  File "C:\Python25\lib\imputil.py", line 106, in _import_hook
    raise ImportError, 'No module named ' + fqname
ImportError: No module named _functools


The mere fact of installing a custom importer seems to break the
import functionality.

Alain


From dns4 at cornell.edu  Fri Feb 20 08:14:34 2009
From: dns4 at cornell.edu (David Smith)
Date: Fri, 20 Feb 2009 08:14:34 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
Message-ID: <gnmabm$rah$1@ruby.cit.cornell.edu>

W. eWatson wrote:
> Matimus wrote:
>> On Feb 19, 8:06 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>> I'm using IDLE for editing, but execute programs directly. If there are
>>> execution or "compile" errors, the console closes before I can see
>>> what it
>>> contains. How do I prevent that?
>>> -- 
>>>                                 W. eWatson
>>>
>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>
>>>                      Web Page: <www.speckledwithstars.net/>
>>
>> Open a console window and type in the name of the script rather than
>> just double clicking on it. Or, you can terminate your script with a
>> 'raw_input("press enter to quit")'.
>>
>> Matt
> I can open the Python command line from Start, but how do I navigate to
> the folder where the program is?
> 

I'm not sure whether I should feel old or write a smart alec comment --
I suppose there are people in the world who don't know what to do with a
command prompt....

Assuming a Windows system:

2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
the single quote characters)
3. Drag/drop the folder containing your python script to your command
prompt window
4. Hit enter in your command prompt window.
5. Type python my_script_name.py to execute my_script_name.py.

--David


From bblais at bryant.edu  Fri Feb 20 08:32:36 2009
From: bblais at bryant.edu (Brian Blais)
Date: Fri, 20 Feb 2009 08:32:36 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
Message-ID: <E5586A8C-E935-45F8-8990-6C857A29958A@bryant.edu>

On Feb 19, 2009, at 23:06 , W. eWatson wrote:

> I'm using IDLE for editing, but execute programs directly.

Is there a reason you are executing them directly?  Why not just run  
the script from IDLE with Run/Run Module (F5) until you are sure  
there are no errors?  You can follow the advice already posted, by  
running it directly from the commandline.  Another hack is to put:

x=raw_input("pausing...")

at the end of your script, but this is really a hack and it would be  
better to use a different solution.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From notvalid2 at sbcglobal.net  Fri Feb 20 08:49:29 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 05:49:29 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <gnmabm$rah$1@ruby.cit.cornell.edu>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
Message-ID: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>


> 
> I'm not sure whether I should feel old or write a smart alec comment --
> I suppose there are people in the world who don't know what to do with a
> command prompt....
> 
> Assuming a Windows system:
> 
> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
> the single quote characters)
> 3. Drag/drop the folder containing your python script to your command
> prompt window
> 4. Hit enter in your command prompt window.
> 5. Type python my_script_name.py to execute my_script_name.py.
> 
> --David
If I enter just cd, then it tells me cd is not defined. If I enter 
c:/python25, it tells me I have a syntax error at c in c:. The title of the 
black background window I have up with a >>> prompt shown in it is 
"Python(command line)". Maybe this isn't the real Python console window?

What I want is that if I execute the program by double clicking on its name 
to display the console window with the program or syntax errors shown 
without it closing in a split second. Putting read_raw in it doesn't work, 
since some error prevents it from ever being seen.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From catherine.heathcote at gmail.com  Fri Feb 20 09:01:08 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 14:01:08 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <EIynl.37668$Sp5.26172@text.news.virginmedia.com>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter 
> c:/python25, it tells me I have a syntax error at c in c:. The title of 
> the black background window I have up with a >>> prompt shown in it is 
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its 
> name to display the console window with the program or syntax errors 
> shown without it closing in a split second. Putting read_raw in it 
> doesn't work, since some error prevents it from ever being seen.
> 

you need to open a dos prompt before doing the steps above. Go to 
start->run and hit "cmd" <enter> without the quotes.


From notvalid2 at sbcglobal.net  Fri Feb 20 09:05:08 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:05:08 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter 
> c:/python25, it tells me I have a syntax error at c in c:. The title of 
> the black background window I have up with a >>> prompt shown in it is 
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its 
> name to display the console window with the program or syntax errors 
> shown without it closing in a split second. Putting read_raw in it 
> doesn't work, since some error prevents it from ever being seen.
> 
Whoa! What's going on here? I just looked at About IDLE, and it shows 1.2.2, 
but yet the second edition of Learning Python talks about going to 2.3 as 
the book is about to go to press, 2004. I thought IDLE came bundled with 
Python. I have Py 2.5. 1.2.2??? Puzzled.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 09:18:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 12:18:20 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
Message-ID: <op.upnl0ubwx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:

> Whoa! What's going on here? I just looked at About IDLE, and it shows  
> 1.2.2, but yet the second edition of Learning Python talks about going  
> to 2.3 as the book is about to go to press, 2004. I thought IDLE came  
> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.

IDLE is a separate product; the version of IDLE that comes with Python  
2.5.4 is 1.2.4

-- 
Gabriel Genellina



From thomasmallen at gmail.com  Fri Feb 20 09:22:29 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Fri, 20 Feb 2009 06:22:29 -0800 (PST)
Subject: FTP libs for Python?
Message-ID: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>

I'm interested in writing a script to ease deployment of minor changes
on some websites here, and it would involve some SFTP transfers. Do
you know of good alternatives to ftplib, which is relatively low-
level?

Thomas


From notvalid2 at sbcglobal.net  Fri Feb 20 09:29:35 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:29:35 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <mailman.348.1235139524.11746.python-list@python.org>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
	<mailman.348.1235139524.11746.python-list@python.org>
Message-ID: <81znl.13277$D32.3772@flpi146.ffdc.sbc.com>

Gabriel Genellina wrote:
> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson <notvalid2 at sbcglobal.net> 
> escribi?:
> 
>> Whoa! What's going on here? I just looked at About IDLE, and it shows 
>> 1.2.2, but yet the second edition of Learning Python talks about going 
>> to 2.3 as the book is about to go to press, 2004. I thought IDLE came 
>> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
> 
> IDLE is a separate product; the version of IDLE that comes with Python 
> 2.5.4 is 1.2.4
> 
Where do I get 2.x.x, or the latest?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From evert.rol at gmail.com  Fri Feb 20 09:30:26 2009
From: evert.rol at gmail.com (Evert Rol)
Date: Fri, 20 Feb 2009 15:30:26 +0100
Subject: Framework installation of 2.6 on OS X, with specified prefix
Message-ID: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>

   Hi,

I'm trying to install Python 2.6 from source on Mac OS X.5, in its own  
directory using a framework install. That goes fine, up to the point  
where it wants to install the applications that come with it (eg, the  
Wish shell): it tries to install things into /Applications, instead of  
eg <prefix>/Applications.
Here's my configure line (the flags are there just to let it find my  
own installed readline):

CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
enable-shared --enable-framework=/sw/Library/Frameworks --with- 
readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5


And the last part of the output of 'make install':

../python.exe ./scripts/BuildApplet.py \
		--destroot "" \
		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/ 
MacOS/Python-32" && echo "-32"`  \
		--output "/sw/Applications/Python 2.6/Build Applet.app" \
		./scripts/BuildApplet.py
cd PythonLauncher && make install DESTDIR=
test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
2.6"
mkdir: /Applications/Python 2.6: Permission denied
make[2]: *** [install] Error 1
make[1]: *** [install_PythonLauncher] Error 2
make: *** [frameworkinstallapps] Error 2


Is there an option on the configure line that I need to set, or  
something in setup.py? Or perhaps hack the Makefile?

   Evert



From luke.dunn at gmail.com  Fri Feb 20 09:31:03 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 06:31:03 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 1,2,3
Message-ID: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>

anyone interested in looking at the following problem.

we are trying to express numbers as minimal expressions using only the
digits one two and three, with conventional arithmetic. so for
instance

33 = 2^(3+2)+1 = 3^3+(3*2)

are both minimal, using 4 digits but

33 = ((3+2)*2+1)*3

using 5 is not.

I have tried coding a function to return the minimal representation
for any integer, but haven't cracked it so far. The naive first
attempt is to generate lots of random strings, eval() them and sort by
size and value. this is inelegant and slow.

I have a dim intuition that it could be done with a very clever bit of
recursion, but the exact form so far eludes me.


From notvalid2 at sbcglobal.net  Fri Feb 20 09:39:14 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:39:14 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <EIynl.37668$Sp5.26172@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
Message-ID: <caznl.13278$D32.2@flpi146.ffdc.sbc.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>>
>>>
>>> I'm not sure whether I should feel old or write a smart alec comment --
>>> I suppose there are people in the world who don't know what to do with a
>>> command prompt....
>>>
>>> Assuming a Windows system:
>>>
>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>>> the single quote characters)
>>> 3. Drag/drop the folder containing your python script to your command
>>> prompt window
>>> 4. Hit enter in your command prompt window.
>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>
>>> --David
>> If I enter just cd, then it tells me cd is not defined. If I enter 
>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>> of the black background window I have up with a >>> prompt shown in it 
>> is "Python(command line)". Maybe this isn't the real Python console 
>> window?
>>
>> What I want is that if I execute the program by double clicking on its 
>> name to display the console window with the program or syntax errors 
>> shown without it closing in a split second. Putting read_raw in it 
>> doesn't work, since some error prevents it from ever being seen.
>>
> 
> you need to open a dos prompt before doing the steps above. Go to 
> start->run and hit "cmd" <enter> without the quotes.
Something is amiss here. There's the MS Command Prompt, which I'm looking at 
right now. Yes, it has cd, and so on. I'm also looking at the Python command 
line window. It allow one to run interactively.

If I write a simple python program with just raw_input, by clicking on the 
file name, I get a window with the the title "\Python25\pythonexe" that 
shows the prompt. If I deliberately put a syntax error in the program, and 
run it by clicking the file, then A window appears and disappears so quickly 
that I have no idea what it said. How do I keep that window up?

Which, if any, of these is the real Python console? What is the window 
called in the example I gave with raw_input?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From vriolk at gmail.com  Fri Feb 20 09:41:51 2009
From: vriolk at gmail.com (coldpizza)
Date: Fri, 20 Feb 2009 06:41:51 -0800 (PST)
Subject: Newbie request assistance....Python - PAMIE - Java
References: <c8e0768f-0407-4c9f-a9db-d4a89089511a@v19g2000yqn.googlegroups.com>
Message-ID: <ed543329-1f71-4e1a-b42d-e122bf301cdf@j8g2000yql.googlegroups.com>

This is not a Pamie issue. Pamie can only see the HTML part of the
page. Any object embedded in the page using the <object> or <embed>
tags is not accessible to the browser, and the browser has no idea
what is inside those objects - it simply passes control to the
corresponding plugin, such as Java, Flash, ActiveX, etc.

To script user interaction with an applet you will probably need some
expensive commercial software such as QuickTestPro or SilkTest.

Pamie is IE-only and does not seem to be actively developed. If you
need a good and robust HTML testing framework look into Selenium,
especially Selenium Remote Control, which can be used with a number of
languages including Python.

As for embedded stuff like Flash or Java applets, there is no freeware
tool that I am aware of which would be able to work with both HTML and
stuff like Flash or Java applets.

Best,
cp

On Feb 19, 10:50?pm, frankrentef <frankren... at yahoo.com> wrote:
> Greetings all...
>
> Newbie here to the Python world. ?I've written some basic script with
> the purpose of automating testing of an application via Python /
> Pamie. ?I've had pretty good success until a spot I'm testing displays
> a Java pop up. ?I need to have Pamie access the fields in the window
> (i.e. add a value and activate the "enter" button.) ?Can someone
> assist.
>
> Some of the code I have currently is as follows...when the script I've
> written gets to the end the java window pops up automatically....I
> don't understand how to interface with it.
>
> THNX
>
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMAX', '5000.00')
> time.sleep(2)
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMIN', '0')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
> ie.timesleep(2)
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMaxMicrRejects',
> '1')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_arc1_btnUpdate')
> time.sleep2



From catherine.heathcote at gmail.com  Fri Feb 20 09:43:50 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 14:43:50 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <caznl.13278$D32.2@flpi146.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
Message-ID: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>

W. eWatson wrote:
> Catherine Heathcote wrote:
>> W. eWatson wrote:
>>>
>>>>
>>>> I'm not sure whether I should feel old or write a smart alec comment --
>>>> I suppose there are people in the world who don't know what to do 
>>>> with a
>>>> command prompt....
>>>>
>>>> Assuming a Windows system:
>>>>
>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>> (w/o
>>>> the single quote characters)
>>>> 3. Drag/drop the folder containing your python script to your command
>>>> prompt window
>>>> 4. Hit enter in your command prompt window.
>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>
>>>> --David
>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>> of the black background window I have up with a >>> prompt shown in 
>>> it is "Python(command line)". Maybe this isn't the real Python 
>>> console window?
>>>
>>> What I want is that if I execute the program by double clicking on 
>>> its name to display the console window with the program or syntax 
>>> errors shown without it closing in a split second. Putting read_raw 
>>> in it doesn't work, since some error prevents it from ever being seen.
>>>
>>
>> you need to open a dos prompt before doing the steps above. Go to 
>> start->run and hit "cmd" <enter> without the quotes.
> Something is amiss here. There's the MS Command Prompt, which I'm 
> looking at right now. Yes, it has cd, and so on. I'm also looking at the 
> Python command line window. It allow one to run interactively.
> 
> If I write a simple python program with just raw_input, by clicking on 
> the file name, I get a window with the the title "\Python25\pythonexe" 
> that shows the prompt. If I deliberately put a syntax error in the 
> program, and run it by clicking the file, then A window appears and 
> disappears so quickly that I have no idea what it said. How do I keep 
> that window up?
> 
> Which, if any, of these is the real Python console? What is the window 
> called in the example I gave with raw_input?
> 

Run the program from within the MS command line, not by double clicking it.


From vriolk at gmail.com  Fri Feb 20 09:45:23 2009
From: vriolk at gmail.com (coldpizza)
Date: Fri, 20 Feb 2009 06:45:23 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <c58e9e7b-fb91-4822-a191-a97e3a8ff4cd@b16g2000yqb.googlegroups.com>

Why don't you just use Curl? It does a dozen of protocols including
SFTP. And if the command line version is not enough for you then there
are Python bindings for Curl.

On Feb 20, 4:22?pm, Thomas Allen <thomasmal... at gmail.com> wrote:
> I'm interested in writing a script to ease deployment of minor changes
> on some websites here, and it would involve some SFTP transfers. Do
> you know of good alternatives to ftplib, which is relatively low-
> level?
>
> Thomas



From mensanator at aol.com  Fri Feb 20 09:47:12 2009
From: mensanator at aol.com (Mensanator)
Date: Fri, 20 Feb 2009 06:47:12 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com>
Message-ID: <be4c6e60-518d-42e5-972a-ad0b91c4e22a@a12g2000yqm.googlegroups.com>

On Feb 20, 4:36?am, sturlamolden <sturlamol... at yahoo.no> wrote:
> On Feb 20, 12:19 am, Mensanator <mensana... at aol.com> wrote:
>
> > What am I actually seeing? If Python only uses one of the cores,
> > why do both light up?
>
> Because of OS scheduling. You have more than one process running. The
> Python process does not stay on one core. Try to put CPython into a
> tight loop ("while 1: pass"). You will see ~50% use of both cores. If
> you had 4 cores, you would see ~25% use.

Saw that once when I had access to a four core machine.

>
> > Is everything much more complicated (due to
> > OS scheduling, etc.) than the simple explanations of GIL?
>
> No.

Don't you mean "yes"?

> Your Python code cannot use more than one core simultaneously.
> It's just that scheduling happens so fast and so often that you don't
> notice it.

Or that the Task Manager can't track the switches fast
enough to show the interleaving giving the illusion that
both cores are operating simultaneously.


From bsk16 at case.edu  Fri Feb 20 09:47:17 2009
From: bsk16 at case.edu (Ben Kaplan)
Date: Fri, 20 Feb 2009 09:47:17 -0500
Subject: Framework installation of 2.6 on OS X, with specified prefix
In-Reply-To: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
Message-ID: <927B41A1-E800-4D8C-B9C5-480531B8DA68@case.edu>



On Feb 20, 2009, at 9:30 AM, Evert Rol <evert.rol at gmail.com> wrote:

>  Hi,
>
> I'm trying to install Python 2.6 from source on Mac OS X.5, in its  
> own directory using a framework install. That goes fine, up to the  
> point where it wants to install the applications that come with it  
> (eg, the Wish shell): it tries to install things into /Applications,  
> instead of eg <prefix>/Applications.
> Here's my configure line (the flags are there just to let it find my  
> own installed readline):
>
> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
> enable-shared --enable-framework=/sw/Library/Frameworks --with- 
> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
>
>
> And the last part of the output of 'make install':
>
> ../python.exe ./scripts/BuildApplet.py \
>        --destroot "" \
>        --python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/ 
> Contents/MacOS/Python-32" && echo "-32"`  \
>        --output "/sw/Applications/Python 2.6/Build Applet.app" \
>        ./scripts/BuildApplet.py
> cd PythonLauncher && make install DESTDIR=
> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
> 2.6"
> mkdir: /Applications/Python 2.6: Permission denied
> make[2]: *** [install] Error 1
> make[1]: *** [install_PythonLauncher] Error 2
> make: *** [frameworkinstallapps] Error 2
>
>
> Is there an option on the configure line that I need to set, or  
> something in setup.py? Or perhaps hack the Makefile?
>
>  Evert
>


It's a security thing- only root can write to directories like / 
Applications. You need to run " sudo make install". You'll be promoted  
for your password and then it will install.
> --
> http://mail.python.org/mailman/listinfo/python-list


From mrmakent at cox.net  Fri Feb 20 09:48:07 2009
From: mrmakent at cox.net (Mike Kent)
Date: Fri, 20 Feb 2009 06:48:07 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>

I use Fabric (http://www.nongnu.org/fab/) as my Python-based
deployment tool, but it uses ssh/scp, not sftp.


From exarkun at divmod.com  Fri Feb 20 10:02:39 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Fri, 20 Feb 2009 10:02:39 -0500
Subject: FTP libs for Python?
In-Reply-To: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <20090220150239.12853.960662794.divmod.quotient.12154@henry.divmod.com>

On Fri, 20 Feb 2009 06:22:29 -0800 (PST), Thomas Allen <thomasmallen at gmail.com> wrote:
>I'm interested in writing a script to ease deployment of minor changes
>on some websites here, and it would involve some SFTP transfers. Do
>you know of good alternatives to ftplib, which is relatively low-
>level?

Twisted includes FTP and SFTP support.

Jean-Paul


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:03:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:03:41 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
	<mailman.348.1235139524.11746.python-list@python.org>
	<81znl.13277$D32.3772@flpi146.ffdc.sbc.com>
Message-ID: <op.upnn4fxqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:29:35 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:

> Gabriel Genellina wrote:
>> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson  
>> <notvalid2 at sbcglobal.net> escribi?:
>>
>>> Whoa! What's going on here? I just looked at About IDLE, and it shows  
>>> 1.2.2, but yet the second edition of Learning Python talks about going  
>>> to 2.3 as the book is about to go to press, 2004. I thought IDLE came  
>>> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
>>  IDLE is a separate product; the version of IDLE that comes with Python  
>> 2.5.4 is 1.2.4
>>
> Where do I get 2.x.x, or the latest?

You may update your Python version to 2.5.4 (the latest release in the 2.5  
series).  Then IDLE will report 1.2.4.  They are separate products, their  
version numbers are uncorrelated.

-- 
Gabriel Genellina



From kom2 at centrum.cz  Fri Feb 20 10:10:13 2009
From: kom2 at centrum.cz (Kom2)
Date: Fri, 20 Feb 2009 07:10:13 -0800 (PST)
Subject: Running script in module initialization
Message-ID: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>

Hello,
I'm trying to convert my project from python 2.5 to python 3.0 and I
have the following problem. My project is PYD library written in C++.
So I have this PyInit_ModuleName function containing PyModule_Create
call and this function also call some script with declarations:


   PyObject* m;

   m = PyModule_Create(&PyVRDAModule);
   if (m == NULL) {
      return NULL;
   }
   PyObject *d, *v;
   d = PyModule_GetDict(m);
   v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
d, NULL);
   ......



txtPyPredefinedConstants is string with this content:

class CursorMoveType:
   First = 0
   Last = 1
   Next = 2
   Previous = 3
   Bookmark = 4
   NewRecord = 5


In Python 2.5 everything works fine, now in python3.0
PyRun_StringFlags returns NULL and I get error "__build_class__ not
found".

Can anybody tell mi please, what is wrong?

thanks Kom2


From patrick.oloughlin at gmail.com  Fri Feb 20 10:16:13 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 15:16:13 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499eaa34$0$21372$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
Message-ID: <cc34a9320902200716t41c957e0rec51243468ae541e@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
> Note that while you *can* do direct access to the implementation attribute
> (here, '_A' for property 'A'), you don't *need* to so (and usually shouldn't
> - unless you have a very compelling reason).

Interesting. Why shouldn't you?
I haven't used the property() function before and probably have no
call to, but when you say "usually shouldn't", what is there against
it?

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From thomasmallen at gmail.com  Fri Feb 20 10:24:37 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Fri, 20 Feb 2009 07:24:37 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
	<ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>
Message-ID: <19a392ba-1ecd-4e92-8636-c684281ed93f@x10g2000yqk.googlegroups.com>

On Feb 20, 9:45 am, coldpizza <vri... at gmail.com> wrote:
> Why don't you just use Curl? It does a dozen of protocols including
> SFTP. And if the command line version is not enough for you then there
> are Python bindings for Curl.

I'm actually hoping to eventually package these tools using py2exe for
some co-workers, which is why I'm not looking to Unix utilities

On Feb 20, 9:48?am, Mike Kent <mrmak... at cox.net> wrote:
> I use Fabric (http://www.nongnu.org/fab/) as my Python-based
> deployment tool, but it uses ssh/scp, not sftp.

I'm looking at Paramiko right now which I saw some people
recommending, as SSH utils are required as well....

Thomas


From vincent at vincentdavis.net  Fri Feb 20 10:25:51 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Fri, 20 Feb 2009 08:25:51 -0700
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <77e831100902200725s505be71exa4726f72ac849a9f@mail.gmail.com>

Having looked long at this how does the prime factorization play into this.
I would consider an approach similar to factoring a number. Of course the
issue with prime factoring is your ned to know the primes. I assume this
would be a similar problem you may need to know the solutions to the
factors. I might look closer at this please post if you come across a
solution.
Thanks
Vincent Davis
720-301-3003


On Fri, Feb 20, 2009 at 7:31 AM, Trip Technician <luke.dunn at gmail.com>wrote:

> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:26:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:26:09 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
Message-ID: <op.upno5vjax6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:39:14 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:
> Catherine Heathcote wrote:

>>  you need to open a dos prompt before doing the steps above. Go to  
>> start->run and hit "cmd" <enter> without the quotes.
> Something is amiss here. There's the MS Command Prompt, which I'm  
> looking at right now. Yes, it has cd, and so on. I'm also looking at the  
> Python command line window. It allow one to run interactively.

Open a command prompt ("CMD", "Console"), that black window you were  
looking at.
Use the cd command to change directory to wherever your Python script is  
saved.
Execute "python -V" (without the quotes). You should get a response,  
including the Python version number. If you get an error like "command not  
found" or similar, you'll have to use the whole path to python.exe -- try  
with "c:\python25\python -V" (again, no quotes).
Once you know how to launch Python, you can:

a) Enter the interactive interpreter: Just launch Python as above but  
without the -V argument. The prompt is now >>>
You can type Python expressions and the interpreter evaluates them. You  
type 2+3, the interpreter answers 5; you type len("abc"), the interpreter  
answers 3...

b) Or, from the command prompt, you can execute a script by launching  
Python the same way as above, passing the script name as an argument:

c:\foo>python script_name.py

This is what you were looking for - in case of syntax errors or something,  
you can see the output on the console. It stays open because it was open  
*before* you launched Python. Just keep the window open.

See http://docs.python.org/using/windows.html for more info. If Python  
doesn't start just by typing "python", you may want to set your PATH  
environment variable as described there.

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Feb 20 10:27:43 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 10:27:43 -0500
Subject: Running script in module initialization
In-Reply-To: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
Message-ID: <gnmi5p$336$1@ger.gmane.org>

Kom2 wrote:
> Hello,
> I'm trying to convert my project from python 2.5 to python 3.0 and I
> have the following problem. My project is PYD library written in C++.
> So I have this PyInit_ModuleName function containing PyModule_Create
> call and this function also call some script with declarations:
> 
> 
>    PyObject* m;
> 
>    m = PyModule_Create(&PyVRDAModule);
>    if (m == NULL) {
>       return NULL;
>    }
>    PyObject *d, *v;
>    d = PyModule_GetDict(m);
>    v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> d, NULL);
>    ......
> 
> 
> 
> txtPyPredefinedConstants is string with this content:
> 
> class CursorMoveType:
>    First = 0
>    Last = 1
>    Next = 2
>    Previous = 3
>    Bookmark = 4
>    NewRecord = 5
> 
> 
> In Python 2.5 everything works fine, now in python3.0
> PyRun_StringFlags returns NULL and I get error "__build_class__ not
> found".
> 
> Can anybody tell mi please, what is wrong?
> 
Presumably you haven't upgraded your extension module to use the new API?

  http://wiki.python.org/moin/PortingExtensionModulesToPy3k

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From notvalid2 at sbcglobal.net  Fri Feb 20 10:37:06 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:37:06 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
Message-ID: <N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>> Catherine Heathcote wrote:
>>> W. eWatson wrote:
>>>>
>>>>>
>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>> comment --
>>>>> I suppose there are people in the world who don't know what to do 
>>>>> with a
>>>>> command prompt....
>>>>>
>>>>> Assuming a Windows system:
>>>>>
>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>>> (w/o
>>>>> the single quote characters)
>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>> prompt window
>>>>> 4. Hit enter in your command prompt window.
>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>
>>>>> --David
>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>>> of the black background window I have up with a >>> prompt shown in 
>>>> it is "Python(command line)". Maybe this isn't the real Python 
>>>> console window?
>>>>
>>>> What I want is that if I execute the program by double clicking on 
>>>> its name to display the console window with the program or syntax 
>>>> errors shown without it closing in a split second. Putting read_raw 
>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>
>>>
>>> you need to open a dos prompt before doing the steps above. Go to 
>>> start->run and hit "cmd" <enter> without the quotes.
>> Something is amiss here. There's the MS Command Prompt, which I'm 
>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>> the Python command line window. It allow one to run interactively.
>>
>> If I write a simple python program with just raw_input, by clicking on 
>> the file name, I get a window with the the title "\Python25\pythonexe" 
>> that shows the prompt. If I deliberately put a syntax error in the 
>> program, and run it by clicking the file, then A window appears and 
>> disappears so quickly that I have no idea what it said. How do I keep 
>> that window up?
>>
>> Which, if any, of these is the real Python console? What is the window 
>> called in the example I gave with raw_input?
>>
> 
> Run the program from within the MS command line, not by double clicking it.
Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS 
commands. I get to drill my way down 4 levels of folders. What DOS cmd 
allows one to list only folders?

Still, why would one design a window that disappears, when it has useful 
data in it? I see that if I click on the window, it has properties, width, 
height, etc.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:38:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:38:41 -0200
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
	<ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>
	<19a392ba-1ecd-4e92-8636-c684281ed93f@x10g2000yqk.googlegroups.com>
Message-ID: <op.upnpqribx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 13:24:37 -0200, Thomas Allen <thomasmallen at gmail.com>  
escribi?:

> On Feb 20, 9:45 am, coldpizza <vri... at gmail.com> wrote:
>> Why don't you just use Curl? It does a dozen of protocols including
>> SFTP. And if the command line version is not enough for you then there
>> are Python bindings for Curl.
>
> I'm actually hoping to eventually package these tools using py2exe for
> some co-workers, which is why I'm not looking to Unix utilities

curl works on Windows too.

-- 
Gabriel Genellina



From wiggly at wiggly.org  Fri Feb 20 10:39:22 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 15:39:22 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <499ECEAA.30103@wiggly.org>

Trip Technician wrote:
> anyone interested in looking at the following problem.

if you can give me a good reason why this is not homework I'd love to 
hear it...I just don't see how this is a real problem.

> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
> 
> 33 = 2^(3+2)+1 = 3^3+(3*2)
> 
> are both minimal, using 4 digits but
> 
> 33 = ((3+2)*2+1)*3
> 
> using 5 is not.
> 
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.

Wow. Okay, what other ways have you tried so far? Or are you beating 
your head against the "search the entire problem space" solution still?

This problem smells a lot like factorisation, so I would think of it in 
terms of wanting to reduce the target number using as few operations as 
possible.

If you allow exponentiation that's going to be your biggest hitter so 
you know that the best you can do using 2 digits is n^n where n is the 
largest digit you allow yourself.

Are you going to allow things like n^n^n or not?

   n




From notvalid2 at sbcglobal.net  Fri Feb 20 10:39:30 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:39:30 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <mailman.352.1235142250.11746.python-list@python.org>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>	<mailman.348.1235139524.11746.python-list@python.org>	<81znl.13277$D32.3772@flpi146.ffdc.sbc.com>
	<mailman.352.1235142250.11746.python-list@python.org>
Message-ID: <18Anl.14217$as4.4271@nlpi069.nbdc.sbc.com>

Gabriel Genellina wrote:
> En Fri, 20 Feb 2009 12:29:35 -0200, W. eWatson <notvalid2 at sbcglobal.net> 
> escribi?:
> 
>> Gabriel Genellina wrote:
>>> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson 
>>> <notvalid2 at sbcglobal.net> escribi?:
>>>
>>>> Whoa! What's going on here? I just looked at About IDLE, and it 
>>>> shows 1.2.2, but yet the second edition of Learning Python talks 
>>>> about going to 2.3 as the book is about to go to press, 2004. I 
>>>> thought IDLE came bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
>>>  IDLE is a separate product; the version of IDLE that comes with 
>>> Python 2.5.4 is 1.2.4
>>>
>> Where do I get 2.x.x, or the latest?
> 
> You may update your Python version to 2.5.4 (the latest release in the 
> 2.5 series).  Then IDLE will report 1.2.4.  They are separate products, 
> their version numbers are uncorrelated.
> 
Ah, I see, the book is referring to version 2.3 of Python and not IDLE.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From dns4 at cornell.edu  Fri Feb 20 10:41:42 2009
From: dns4 at cornell.edu (David Smith)
Date: Fri, 20 Feb 2009 10:41:42 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <gnmivj$f78$1@ruby.cit.cornell.edu>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter
> c:/python25, it tells me I have a syntax error at c in c:. The title of
> the black background window I have up with a >>> prompt shown in it is
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its
> name to display the console window with the program or syntax errors
> shown without it closing in a split second. Putting read_raw in it
> doesn't work, since some error prevents it from ever being seen.
> 

What I meant was open open the command prompt, type cd, space, DO NOT
hit enter yet.  Drag the folder with your script into the command prompt
window.  Then go to the command prompt window and hit enter.  This
should compose a command similar to the following:

C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
Documents\My Project"

C:\Documents and Settings\user\My Documents\My Project> _

--David


From catherine.heathcote at gmail.com  Fri Feb 20 10:45:56 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 15:45:56 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
	<N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
Message-ID: <UeAnl.37694$Sp5.29793@text.news.virginmedia.com>

W. eWatson wrote:
> Catherine Heathcote wrote:
>> W. eWatson wrote:
>>> Catherine Heathcote wrote:
>>>> W. eWatson wrote:
>>>>>
>>>>>>
>>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>>> comment --
>>>>>> I suppose there are people in the world who don't know what to do 
>>>>>> with a
>>>>>> command prompt....
>>>>>>
>>>>>> Assuming a Windows system:
>>>>>>
>>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt 
>>>>>> window (w/o
>>>>>> the single quote characters)
>>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>>> prompt window
>>>>>> 4. Hit enter in your command prompt window.
>>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>>
>>>>>> --David
>>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>>> c:/python25, it tells me I have a syntax error at c in c:. The 
>>>>> title of the black background window I have up with a >>> prompt 
>>>>> shown in it is "Python(command line)". Maybe this isn't the real 
>>>>> Python console window?
>>>>>
>>>>> What I want is that if I execute the program by double clicking on 
>>>>> its name to display the console window with the program or syntax 
>>>>> errors shown without it closing in a split second. Putting read_raw 
>>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>>
>>>>
>>>> you need to open a dos prompt before doing the steps above. Go to 
>>>> start->run and hit "cmd" <enter> without the quotes.
>>> Something is amiss here. There's the MS Command Prompt, which I'm 
>>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>>> the Python command line window. It allow one to run interactively.
>>>
>>> If I write a simple python program with just raw_input, by clicking 
>>> on the file name, I get a window with the the title 
>>> "\Python25\pythonexe" that shows the prompt. If I deliberately put a 
>>> syntax error in the program, and run it by clicking the file, then A 
>>> window appears and disappears so quickly that I have no idea what it 
>>> said. How do I keep that window up?
>>>
>>> Which, if any, of these is the real Python console? What is the 
>>> window called in the example I gave with raw_input?
>>>
>>
>> Run the program from within the MS command line, not by double 
>> clicking it.
> Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS 
> commands. I get to drill my way down 4 levels of folders. What DOS cmd 
> allows one to list only folders?
> 
> Still, why would one design a window that disappears, when it has useful 
> data in it? I see that if I click on the window, it has properties, 
> width, height, etc.
> 

Thats programming. Whaterver the language, you will need to be 
comfortable with the CLI of your operating system.


From luke.dunn at gmail.com  Fri Feb 20 10:52:10 2009
From: luke.dunn at gmail.com (Luke Dunn)
Date: Fri, 20 Feb 2009 15:52:10 +0000
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <499ECEAA.30103@wiggly.org>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
Message-ID: <b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>

I am teaching myself coding. No university or school, so i guess its
homework if you like. i am interested in algorithms generally, after doing
some of Project Euler. Of course my own learning process is best served by
just getting on with it but sometimes you will do that while other times you
might just choose to ask for help. if no one suggests then i will probably
shelve it and come back to it myself when I'm fresh.

no it's not a real world problem but my grounding is in math so i like pure
stuff anyway. don't see how that is a problem, as a math person i accept the
validity of pure research conducted just for curiosity and aesthetic
satisfaction. it often finds an application later anyway

Thanks for your helpful suggestion of trying other methods and i will do
that in time. my motive was to share an interesting problem because a human
of moderate math education can sit down with this and find minimal solutions
easily but the intuition they use is quite subtle, hence the idea of
converting the human heuristic into an algorithm became of interest, and
particularly a recursive one. i find that the development of a piece of
recursion usually comes as an 'aha', and since i hadn't had such a moment, i
thought i'd turn the problem loose on the public. also i found no online
reference to this problem so it seemed ripe for sharing.

On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org> wrote:

> Trip Technician wrote:
>
>> anyone interested in looking at the following problem.
>>
>
> if you can give me a good reason why this is not homework I'd love to hear
> it...I just don't see how this is a real problem.
>
> we are trying to express numbers as minimal expressions using only the
>> digits one two and three, with conventional arithmetic. so for
>> instance
>>
>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>>
>> are both minimal, using 4 digits but
>>
>> 33 = ((3+2)*2+1)*3
>>
>> using 5 is not.
>>
>> I have tried coding a function to return the minimal representation
>> for any integer, but haven't cracked it so far. The naive first
>> attempt is to generate lots of random strings, eval() them and sort by
>> size and value. this is inelegant and slow.
>>
>
> Wow. Okay, what other ways have you tried so far? Or are you beating your
> head against the "search the entire problem space" solution still?
>
> This problem smells a lot like factorisation, so I would think of it in
> terms of wanting to reduce the target number using as few operations as
> possible.
>
> If you allow exponentiation that's going to be your biggest hitter so you
> know that the best you can do using 2 digits is n^n where n is the largest
> digit you allow yourself.
>
> Are you going to allow things like n^n^n or not?
>
>  n
>
>
>
-------------- next part --------------
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From notvalid2 at sbcglobal.net  Fri Feb 20 10:55:46 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:55:46 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <gnmivj$f78$1@ruby.cit.cornell.edu>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<gnmivj$f78$1@ruby.cit.cornell.edu>
Message-ID: <YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>

David Smith wrote:
> W. eWatson wrote:
>>> I'm not sure whether I should feel old or write a smart alec comment --
>>> I suppose there are people in the world who don't know what to do with a
>>> command prompt....
>>>
>>> Assuming a Windows system:
>>>
>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>>> the single quote characters)
>>> 3. Drag/drop the folder containing your python script to your command
>>> prompt window
>>> 4. Hit enter in your command prompt window.
>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>
>>> --David
>> If I enter just cd, then it tells me cd is not defined. If I enter
>> c:/python25, it tells me I have a syntax error at c in c:. The title of
>> the black background window I have up with a >>> prompt shown in it is
>> "Python(command line)". Maybe this isn't the real Python console window?
>>
>> What I want is that if I execute the program by double clicking on its
>> name to display the console window with the program or syntax errors
>> shown without it closing in a split second. Putting read_raw in it
>> doesn't work, since some error prevents it from ever being seen.
>>
> 
> What I meant was open open the command prompt, type cd, space, DO NOT
> hit enter yet.  Drag the folder with your script into the command prompt
> window.  Then go to the command prompt window and hit enter.  This
> should compose a command similar to the following:
> 
> C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
> Documents\My Project"
> 
> C:\Documents and Settings\user\My Documents\My Project> _
> 
> --David
Ah, I thought I'd be clever and do a copy on the path name in the address 
area at the top of the folder. That doesn't work. I'm quite surprised though 
that one can do the drag as you say. But, hey, it works. Thanks. I wonder 
what else non-DOS things can be done in it?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From robert.kern at gmail.com  Fri Feb 20 10:59:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 09:59:16 -0600
Subject: Matplotlib change xticks and retain xticks changing during zoom
In-Reply-To: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>
References: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>
Message-ID: <gnmk0k$b4j$1@ger.gmane.org>

You will probably get better help on the matplotlib mailing list:

   https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Fri Feb 20 10:59:52 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 09:59:52 -0600
Subject: matplotlib issue: cannot auto-scale X axis of plop properly
In-Reply-To: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>
References: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>
Message-ID: <gnmk1o$ao4$1@ger.gmane.org>

On 2009-02-19 19:22, Nash, Brent R wrote:
> Hey everyone,
>
> I'm fairly new to matplotlib, but have read through tons of the
> documentation today and have a decent understanding of it. All the
> auto-scaling, xlim, and x_bound stuff works fine for me with the
> examples, but as soon as I try to use it on my data, it's not working
> for me. I've attached a demo script, 2 input files of data, and a PNG
> showing the resulting chart I get. The numbers on my Y-axis range from
> 7656 to 59928 (a difference of 52272) and the numbers on my X-axis range
> from 1.22896144017e+12 to 1.22896155012e+12 (a difference of 109950).

You will probably get better help on the matplotlib mailing list:

   https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From luke.dunn at gmail.com  Fri Feb 20 11:01:25 2009
From: luke.dunn at gmail.com (Luke Dunn)
Date: Fri, 20 Feb 2009 16:01:25 +0000
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
Message-ID: <b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>

yes power towers are allowed

exponentiation, multiplication, division, addition and subtraction. Brackets
when necessary but length is sorted on number of digits not number of
operators plus digits.

I always try my homework myself first. in 38 years of life I've learned only
to do what i want, if I wanted everyone else to do my work for me I'd be a
management consultant !
On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com> wrote:

> I am teaching myself coding. No university or school, so i guess its
> homework if you like. i am interested in algorithms generally, after doing
> some of Project Euler. Of course my own learning process is best served by
> just getting on with it but sometimes you will do that while other times you
> might just choose to ask for help. if no one suggests then i will probably
> shelve it and come back to it myself when I'm fresh.
>
> no it's not a real world problem but my grounding is in math so i like pure
> stuff anyway. don't see how that is a problem, as a math person i accept the
> validity of pure research conducted just for curiosity and aesthetic
> satisfaction. it often finds an application later anyway
>
> Thanks for your helpful suggestion of trying other methods and i will do
> that in time. my motive was to share an interesting problem because a human
> of moderate math education can sit down with this and find minimal solutions
> easily but the intuition they use is quite subtle, hence the idea of
> converting the human heuristic into an algorithm became of interest, and
> particularly a recursive one. i find that the development of a piece of
> recursion usually comes as an 'aha', and since i hadn't had such a moment, i
> thought i'd turn the problem loose on the public. also i found no online
> reference to this problem so it seemed ripe for sharing.
>
>   On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org> wrote:
>
>> Trip Technician wrote:
>>
>>> anyone interested in looking at the following problem.
>>>
>>
>> if you can give me a good reason why this is not homework I'd love to hear
>> it...I just don't see how this is a real problem.
>>
>> we are trying to express numbers as minimal expressions using only the
>>> digits one two and three, with conventional arithmetic. so for
>>> instance
>>>
>>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>>>
>>> are both minimal, using 4 digits but
>>>
>>> 33 = ((3+2)*2+1)*3
>>>
>>> using 5 is not.
>>>
>>> I have tried coding a function to return the minimal representation
>>> for any integer, but haven't cracked it so far. The naive first
>>> attempt is to generate lots of random strings, eval() them and sort by
>>> size and value. this is inelegant and slow.
>>>
>>
>> Wow. Okay, what other ways have you tried so far? Or are you beating your
>> head against the "search the entire problem space" solution still?
>>
>> This problem smells a lot like factorisation, so I would think of it in
>> terms of wanting to reduce the target number using as few operations as
>> possible.
>>
>> If you allow exponentiation that's going to be your biggest hitter so you
>> know that the best you can do using 2 digits is n^n where n is the largest
>> digit you allow yourself.
>>
>> Are you going to allow things like n^n^n or not?
>>
>>  n
>>
>>
>>
>
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From http  Fri Feb 20 11:02:45 2009
From: http (Paul Rubin)
Date: 20 Feb 2009 08:02:45 -0800
Subject: code challenge: generate minimal expressions using only digits 1,
	2, 3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <7xljs1xfiy.fsf@ruckus.brouhaha.com>

Trip Technician <luke.dunn at gmail.com> writes:
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.

This sounds a little like a homework assignment, or maybe a challenge
you are trying to solve for yourself, rather than be given a complete
answer for.  Anyway, the basic idea is to enumerate the expression
trees with 1 digit, then 2 digits, then 3 digits, etc, and compute the
value expressed by each tree.


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 11:03:04 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 17:03:04 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <mailman.353.1235142977.11746.python-list@python.org>
References: <mailman.114.1234882494.11746.python-list@python.org>	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
Message-ID: <499ed41c$0$15309$426a74cc@news.free.fr>

Paddy O'Loughlin a ?crit :
> 2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>> Note that while you *can* do direct access to the implementation attribute
>> (here, '_A' for property 'A'), you don't *need* to so (and usually shouldn't
>> - unless you have a very compelling reason).
> 
> Interesting. Why shouldn't you?
> I haven't used the property() function

s/function/object/

> before and probably have no
> call to, but when you say "usually shouldn't", what is there against
> it?

The case is that the whole point of using a computed attribute is to 
perform some computation on the value. IOW, except for a couple corner 
cases, only the accessors should directly access the implementation(s) 
attributes(s).

And of course, like for any other GoldenRule(tm), it's not meant to be 
blindly followed. It's just that most of the times, going thru the 
accessors is really what you want - even from within the class code.


From cdsd at d.com  Fri Feb 20 11:12:00 2009
From: cdsd at d.com (ssd)
Date: Fri, 20 Feb 2009 17:12:00 +0100
Subject: Problem with lists.
Message-ID: <gnsdo4$mvc$2@aioe.org>


Hi,

In the following code, (in Python 2.5)
I was expecting to get in "b" variable the values  b: [[0, 0], [0, 1],[0,
2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]

My code:

a = ["",""]
b = []

for i in range (0,5):
    for j in range (0,5):
        a[0] = i
        a[1] = j
        print "a: " + str(a)
        b.append(a)

print "b: " + str(b)

what is worng in the code?

Thanks,
Bye,







From gagsl-py2 at yahoo.com.ar  Fri Feb 20 11:14:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 14:14:16 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
	<N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
Message-ID: <op.upnrd2dlx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 13:37:06 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:
> Catherine Heathcote wrote:
>> W. eWatson wrote:

>>  Run the program from within the MS command line, not by double  
>> clicking it.
> Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS  
> commands. I get to drill my way down 4 levels of folders. What DOS cmd  
> allows one to list only folders?

After executing these two commands, pressing TAB will auto-complete  
matching filenames/directories:

reg add "HKLM\Software\Microsoft\Command Processor" /v CompletionChar /t  
REG_DWORD /d 9

reg add "HKLM\Software\Microsoft\Command Processor" /v PathCompletionChar  
/t REG_DWORD /d 9

(Overwrite the previous value, if exists). This is a global change and the  
logged on user must have administrative rights to modify the registry.  
Unprivileged users must use HKCU instead of HKLM.

-- 
Gabriel Genellina



From luke.dunn at gmail.com  Fri Feb 20 11:30:10 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 08:30:10 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<7xljs1xfiy.fsf@ruckus.brouhaha.com>
Message-ID: <aa7ab076-d72b-4db3-b522-b1a265fbc8ac@s20g2000yqh.googlegroups.com>

On 20 Feb, 16:02, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Trip Technician <luke.d... at gmail.com> writes:
> > I have a dim intuition that it could be done with a very clever bit of
> > recursion, but the exact form so far eludes me.
>
> This sounds a little like a homework assignment, or maybe a challenge
> you are trying to solve for yourself, rather than be given a complete
> answer for. ?Anyway, the basic idea is to enumerate the expression
> trees with 1 digit, then 2 digits, then 3 digits, etc, and compute the
> value expressed by each tree.

Thanks will get onto it. It's just a challenge I set myself so hints
only are cool.


From luke.dunn at gmail.com  Fri Feb 20 11:32:55 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 08:32:55 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<mailman.362.1235146456.11746.python-list@python.org>
Message-ID: <524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>

On 20 Feb, 15:39, Nigel Rantor <wig... at wiggly.org> wrote:
> Trip Technician wrote:
> > anyone interested in looking at the following problem.
>
> if you can give me a good reason why this is not homework I'd love to
> hear it...I just don't see how this is a real problem.
>
>
>
>
>
> > we are trying to express numbers as minimal expressions using only the
> > digits one two and three, with conventional arithmetic. so for
> > instance
>
> > 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> > are both minimal, using 4 digits but
>
> > 33 = ((3+2)*2+1)*3
>
> > using 5 is not.
>
> > I have tried coding a function to return the minimal representation
> > for any integer, but haven't cracked it so far. The naive first
> > attempt is to generate lots of random strings, eval() them and sort by
> > size and value. this is inelegant and slow.
>
> Wow. Okay, what other ways have you tried so far? Or are you beating
> your head against the "search the entire problem space" solution still?
>
> This problem smells a lot like factorisation, so I would think of it in
> terms of wanting to reduce the target number using as few operations as
> possible.
>
> If you allow exponentiation that's going to be your biggest hitter so
> you know that the best you can do using 2 digits is n^n where n is the
> largest digit you allow yourself.
>
> Are you going to allow things like n^n^n or not?
>
> ? ?n- Hide quoted text -
>
> - Show quoted text -

yes n^n^n would be fine. agree it is connected to factorisation.
building a tree of possible expressions is my next angle.


From digitig at gmail.com  Fri Feb 20 11:33:20 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 20 Feb 2009 16:33:20 +0000
Subject: get most common number in a list with tolerance
In-Reply-To: <499E6EC0.8090509@al.com.au>
References: <499E6EC0.8090509@al.com.au>
Message-ID: <aee48b3c0902200833t719feedaw4763081d597ce71e@mail.gmail.com>

2009/2/20 Astan Chee <astan.chee at al.com.au>:
> Hi,
> I have a list that has a bunch of numbers in it and I want to get the most
> common number that appears in the list. This is trivial because i can do a
> max on each unique number. What I want to do is to have a tolerance to say
> that each number is not quite unique and if the difference from other
> numbers is small, than it can be counted together. This is what I have to
> get the common number (taken from the internet somewhere):
>
> l = [10,30,20,20,11,12]
> d = {}
> tolerance = 5
> for elm in l:
>   d[elm] = d.get(elm, 0) + 1
> counts = [(j,i) for i,j in d.items()]
>
>
>
> This of course returns a list where each of them is unique
>
> [(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]
>
> but I am expecting a list that looks like this:
>
> [(3, 10), (2, 20), (1, 30)]

Why only the points 10, 20 and 30? what has happened to (3,11), for
example? (10, 11 and 12 are all within 11+/-5)

It seems you are trying to do one of two things. Either you are trying
to form a histogram with data bands +/-tolerance, or you are trying to
do something like kernel smoothing with a rectangular kernel.

What would you expect the output to be if the data set were
[10,30,20,20,11,12,13] and the tolerance were 2?

-- 
Tim Rowe


From andrew at acooke.org  Fri Feb 20 11:34:34 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 13:34:34 -0300 (CLST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <c5033fe7d216df6de36ed970947edf23.squirrel@localhost>


this is a neat problem.

here is what i would do: use generators that extend an input.  a stream
approach.  the initial input would be the numbers themselves.

[('1', 1),('2', 2),('3', 3)]

those are (expression, value) pairs

then an initial attempt at the next function would be to extend that list
with additions:

def additions(pairs):
  for (expr1, value1) in pairs:
    # first, pass through unchanged
    yield (expr1, value1)
    # then generate all possible additions
    for (expr2, value2) in pairs:
      yield ('%s+%s'%(value1, value2), value1 + value2))

this would give you:

[('1', 1),('2', 2),('3', 3), ('1+1', 2), ...]

(you may need to add parentheses to expressions to preserve meaning
correctly)

you could extend that with an extra loop over different operations.
(subtraction, multiplication, etc)

then you could repeat that as often as you want (eating its own tail, in a
sense, i think).  an infinite list is ok because these are generators.

then you could filter that to group expressions that give a certain value,
and find the shortest.

andrew



Trip Technician wrote:
> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From wiggly at wiggly.org  Fri Feb 20 11:38:18 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 16:38:18 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>	
	<499ECEAA.30103@wiggly.org>	
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
	<b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
Message-ID: <499EDC7A.80201@wiggly.org>

Luke Dunn wrote:
> yes power towers are allowed

right, okay, without coding it here's my thought.

factorise the numbers you have but only allowing primes that exist in 
your digit set.

then take that factorisation and turn any repeated runs of digits 
multiplied by themselves into power-towers

any remainder can then be created in other ways, starting with a way 
other than exponentiation that is able to create the largest number, 
i.e. multiplication, then addition...

I've not got time to put it into code right now  but it shouldn't be too 
hard...

e.g.

digits : 3, 2, 1

n : 10
10 = 2*5 - but we don't have 5...
10 = 3*3 + 1
10 = 3^2+1
3 digits

n : 27
27 = 3*3*3
27 = 3^3
2 digits

n : 33
33 = 3*3*3 + 6
33 = 3*3*3 + 3*2
33 = 3^3+3*2
4 digits

> exponentiation, multiplication, division, addition and subtraction. 
> Brackets when necessary but length is sorted on number of digits not 
> number of operators plus digits.
>  
> I always try my homework myself first. in 38 years of life I've 
> learned only to do what i want, if I wanted everyone else to do my work 
> for me I'd be a management consultant !
> On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com 
> <mailto:luke.dunn at gmail.com>> wrote:
> 
>     I am teaching myself coding. No university or school, so i guess its
>     homework if you like. i am interested in algorithms generally, after
>     doing some of Project Euler. Of course my own learning process is
>     best served by just getting on with it but sometimes you will do
>     that while other times you might just choose to ask for help. if no
>     one suggests then i will probably shelve it and come back to it
>     myself when I'm fresh.
>      
>     no it's not a real world problem but my grounding is in math so i
>     like pure stuff anyway. don't see how that is a problem, as a math
>     person i accept the validity of pure research conducted just for
>     curiosity and aesthetic satisfaction. it often finds an application
>     later anyway
>      
>     Thanks for your helpful suggestion of trying other methods and i
>     will do that in time. my motive was to share an interesting problem
>     because a human of moderate math education can sit down with this
>     and find minimal solutions easily but the intuition they use is
>     quite subtle, hence the idea of converting the human heuristic into
>     an algorithm became of interest, and particularly a recursive one. i
>     find that the development of a piece of recursion usually comes as
>     an 'aha', and since i hadn't had such a moment, i thought i'd turn
>     the problem loose on the public. also i found no online reference to
>     this problem so it seemed ripe for sharing.
> 
>     On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org
>     <mailto:wiggly at wiggly.org>> wrote:
> 
>         Trip Technician wrote:
> 
>             anyone interested in looking at the following problem.
> 
> 
>         if you can give me a good reason why this is not homework I'd
>         love to hear it...I just don't see how this is a real problem.
> 
> 
>             we are trying to express numbers as minimal expressions
>             using only the
>             digits one two and three, with conventional arithmetic. so for
>             instance
> 
>             33 = 2^(3+2)+1 = 3^3+(3*2)
> 
>             are both minimal, using 4 digits but
> 
>             33 = ((3+2)*2+1)*3
> 
>             using 5 is not.
> 
>             I have tried coding a function to return the minimal
>             representation
>             for any integer, but haven't cracked it so far. The naive first
>             attempt is to generate lots of random strings, eval() them
>             and sort by
>             size and value. this is inelegant and slow.
> 
> 
>         Wow. Okay, what other ways have you tried so far? Or are you
>         beating your head against the "search the entire problem space"
>         solution still?
> 
>         This problem smells a lot like factorisation, so I would think
>         of it in terms of wanting to reduce the target number using as
>         few operations as possible.
> 
>         If you allow exponentiation that's going to be your biggest
>         hitter so you know that the best you can do using 2 digits is
>         n^n where n is the largest digit you allow yourself.
> 
>         Are you going to allow things like n^n^n or not?
> 
>          n
> 
> 
> 
> 



From wiggly at wiggly.org  Fri Feb 20 11:41:45 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 16:41:45 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>	<mailman.362.1235146456.11746.python-list@python.org>
	<524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>
Message-ID: <499EDD49.80703@wiggly.org>

Trip Technician wrote:
> 
> yes n^n^n would be fine. agree it is connected to factorisation.
> building a tree of possible expressions is my next angle.

I think building trees of the possible expressions as a couple of other 
people have suggested is simply a more structured way of doing what 
you're currnetly doing.

Right now you're throwing darts at the problem space, and hoping that 
the next one point you hit will be a more optimal solution.

If you enumerate all the expression trees you are just ensuring you 
don't miss any solutions.

I think the algorithm/hueristic I just posted should get you to the 
answer quicker though...

   n


From yguan08 at gmail.com  Fri Feb 20 11:46:38 2009
From: yguan08 at gmail.com (Allen)
Date: Fri, 20 Feb 2009 08:46:38 -0800 (PST)
Subject: cx_oracle -- how to insert "&"
Message-ID: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>

I am using Python with cx_oracle to load an excel spreadsheet into an
Oracle table. There are lots of text on the spreadsheet that have "&"
in them which I want to keep in the table. But inserting those text
will fail. Is there a work around for this? I can filter out the
failed insert statements and in SQLPLUS set define off  to run those
statements, but it would be nice to insert "&" directly in PYTHON.

Allen


From jimzat at iname.com  Fri Feb 20 11:47:27 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 08:47:27 -0800 (PST)
Subject: Killing subservient threads
Message-ID: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>

I am trying to create an app which will have a main window from which
the user will launch other (children) windows.

When I launch the child window I start a new thread which periodically
polls another device and updates the child window accordingly.  When I
dismiss the child window the "polling" thread stays alive and then
crashes with an exception when trying to write to the now defunct
child window.

How can I handle this?  I want to either 1) have the destructor for
the child window kill the spawned thread or 2) catch the exception
within the "polling" thread and see that the child window is gone and
then commit suicide.

I am an experienced embedded C programmer but have VERY little
experience with GUI programming and no experience in the Micro$oft
programming world.



From patrick.oloughlin at gmail.com  Fri Feb 20 12:04:23 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 17:04:23 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499ed41c$0$15309$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
	<499ed41c$0$15309$426a74cc@news.free.fr>
Message-ID: <cc34a9320902200904i60a21134t6b98a6b1c12f0c90@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>> Interesting. Why shouldn't you?
>> I haven't used the property() function
>
> s/function/object/

Nice try, but what I wrote was what I intended to say:
http://docs.python.org/library/functions.html#property

For all I know I could have used property objects several times in modules :)

> The case is that the whole point of using a computed attribute is to perform
> some computation on the value. IOW, except for a couple corner cases, only
> the accessors should directly access the implementation(s) attributes(s).
>
> And of course, like for any other GoldenRule(tm), it's not meant to be
> blindly followed. It's just that most of the times, going thru the accessors
> is really what you want - even from within the class code.

Hmm, it doesn't seem to me like it's much of a big deal, for it to
described as anything like a "GoldenRule" or to advise against its
overuse.
You use it when its appropriate and don't use it when you it's not,
like any other feature.

Paddy


-- 
"Ray, when someone asks you if you're a god, you say YES!"


From google at mrabarnett.plus.com  Fri Feb 20 12:13:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 20 Feb 2009 17:13:44 +0000
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
Message-ID: <499EE4C8.4060104@mrabarnett.plus.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>> Catherine Heathcote wrote:
>>> W. eWatson wrote:
>>>>
>>>>>
>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>> comment --
>>>>> I suppose there are people in the world who don't know what to do 
>>>>> with a
>>>>> command prompt....
>>>>>
>>>>> Assuming a Windows system:
>>>>>
>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>>> (w/o
>>>>> the single quote characters)
>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>> prompt window
>>>>> 4. Hit enter in your command prompt window.
>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>
>>>>> --David
>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>>> of the black background window I have up with a >>> prompt shown in 
>>>> it is "Python(command line)". Maybe this isn't the real Python 
>>>> console window?
>>>>
>>>> What I want is that if I execute the program by double clicking on 
>>>> its name to display the console window with the program or syntax 
>>>> errors shown without it closing in a split second. Putting read_raw 
>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>
>>>
>>> you need to open a dos prompt before doing the steps above. Go to 
>>> start->run and hit "cmd" <enter> without the quotes.
>> Something is amiss here. There's the MS Command Prompt, which I'm 
>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>> the Python command line window. It allow one to run interactively.
>>
>> If I write a simple python program with just raw_input, by clicking on 
>> the file name, I get a window with the the title "\Python25\pythonexe" 
>> that shows the prompt. If I deliberately put a syntax error in the 
>> program, and run it by clicking the file, then A window appears and 
>> disappears so quickly that I have no idea what it said. How do I keep 
>> that window up?
>>
>> Which, if any, of these is the real Python console? What is the window 
>> called in the example I gave with raw_input?
>>
> 
> Run the program from within the MS command line, not by double clicking it.
> 
Or create a .bat file containing the commands to run the Python program,
ending with the command "pause", which will wait for you to press a key
when the program has quit.


From bing.liu at gmail.com  Fri Feb 20 12:14:52 2009
From: bing.liu at gmail.com (bing)
Date: Fri, 20 Feb 2009 09:14:52 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
Message-ID: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>

Hi, I have some simple python scripts, anyone knows how to run the
Python Scripts in C++?
Any code example would be really helpful and appreciated.


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 12:21:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 15:21:42 -0200
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
Message-ID: <op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 14:47:27 -0200, jimzat <jimzat at iname.com> escribi?:

> I am trying to create an app which will have a main window from which
> the user will launch other (children) windows.
>
> When I launch the child window I start a new thread which periodically
> polls another device and updates the child window accordingly.  When I
> dismiss the child window the "polling" thread stays alive and then
> crashes with an exception when trying to write to the now defunct
> child window.
>
> How can I handle this?  I want to either 1) have the destructor for
> the child window kill the spawned thread or 2) catch the exception
> within the "polling" thread and see that the child window is gone and
> then commit suicide.

1) make the child window set a flag in the thread (let's say, t.terminate  
= True). And make the polling thread check the flag periodically (you  
possibly already have a loop there - just break the loop when you detect  
that self.terminate became true)

2) catching an exception is as easy as enclosing the code in a try/except  
block. And "commit suicide" is just "exit from the run() method".

-- 
Gabriel Genellina



From koranthala at gmail.com  Fri Feb 20 12:22:36 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 20 Feb 2009 09:22:36 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
Message-ID: <eaeaa3de-bac1-44aa-a3dd-f35e3d63248a@b38g2000prf.googlegroups.com>

On Feb 20, 9:47?pm, jimzat <jim... at iname.com> wrote:
> I am trying to create an app which will have a main window from which
> the user will launch other (children) windows.
>
> When I launch the child window I start a new thread which periodically
> polls another device and updates the child window accordingly. ?When I
> dismiss the child window the "polling" thread stays alive and then
> crashes with an exception when trying to write to the now defunct
> child window.
>
> How can I handle this? ?I want to either 1) have the destructor for
> the child window kill the spawned thread or 2) catch the exception
> within the "polling" thread and see that the child window is gone and
> then commit suicide.
>
> I am an experienced embedded C programmer but have VERY little
> experience with GUI programming and no experience in the Micro$oft
> programming world.

thread.setDaemon(True)
Makes it a daemon thread which means that interpreter will not stay
alive if only that thread is alive.


From notvalid2 at sbcglobal.net  Fri Feb 20 12:26:37 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 09:26:37 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<gnmivj$f78$1@ruby.cit.cornell.edu>
	<YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>
Message-ID: <rIBnl.7488$jZ1.4111@flpi144.ffdc.sbc.com>

W. eWatson wrote:
> David Smith wrote:
>> W. eWatson wrote:
>>>> I'm not sure whether I should feel old or write a smart alec comment --
>>>> I suppose there are people in the world who don't know what to do 
>>>> with a
>>>> command prompt....
>>>>
>>>> Assuming a Windows system:
>>>>
>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>> (w/o
>>>> the single quote characters)
>>>> 3. Drag/drop the folder containing your python script to your command
>>>> prompt window
>>>> 4. Hit enter in your command prompt window.
>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>
>>>> --David
>>> If I enter just cd, then it tells me cd is not defined. If I enter
>>> c:/python25, it tells me I have a syntax error at c in c:. The title of
>>> the black background window I have up with a >>> prompt shown in it is
>>> "Python(command line)". Maybe this isn't the real Python console window?
>>>
>>> What I want is that if I execute the program by double clicking on its
>>> name to display the console window with the program or syntax errors
>>> shown without it closing in a split second. Putting read_raw in it
>>> doesn't work, since some error prevents it from ever being seen.
>>>
>>
>> What I meant was open open the command prompt, type cd, space, DO NOT
>> hit enter yet.  Drag the folder with your script into the command prompt
>> window.  Then go to the command prompt window and hit enter.  This
>> should compose a command similar to the following:
>>
>> C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
>> Documents\My Project"
>>
>> C:\Documents and Settings\user\My Documents\My Project> _
>>
>> --David
> Ah, I thought I'd be clever and do a copy on the path name in the 
> address area at the top of the folder. That doesn't work. I'm quite 
> surprised though that one can do the drag as you say. But, hey, it 
> works. Thanks. I wonder what else non-DOS things can be done in it?
> 
Well, there is a difficulty with this method. The path is very long, and one 
must change the property width of the window. However, putting the name of a 
long py file further complicates this.

The negative surprise here is that I'm trying to avoid executing the program 
in IDLE, because I'm told elsewhere it produced erroneous error msgs. They 
are exactly the same here. I'll take this up on another thread.



-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 12:28:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 15:28:02 -0200
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
Message-ID: <op.upnus0mxx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 15:14:52 -0200, bing <bing.liu at gmail.com> escribi?:

> Hi, I have some simple python scripts, anyone knows how to run the
> Python Scripts in C++?
> Any code example would be really helpful and appreciated.

Do you want to write a C++ application, and allow your users to write  
scripts in Python, possibly exposing some objects from you application?

Yes: read the "Extending and Embedding" document, specially the "Embedding  
part" (last)
<http://docs.python.org/extending/index.html>

No: please explain in more detail what you want to do.

-- 
Gabriel Genellina



From lists at cheimes.de  Fri Feb 20 12:30:43 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 18:30:43 +0100
Subject: Killing subservient threads
In-Reply-To: <op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnmpc3$ul2$1@ger.gmane.org>

Gabriel Genellina wrote:
> 1) make the child window set a flag in the thread (let's say,
> t.terminate = True). And make the polling thread check the flag
> periodically (you possibly already have a loop there - just break the
> loop when you detect that self.terminate became true)

threading.Condition() and threading.Event() are especially designed for
the job. Please use them appropriately.

Christian



From marc.wyburn at googlemail.com  Fri Feb 20 12:33:13 2009
From: marc.wyburn at googlemail.com (marc wyburn)
Date: Fri, 20 Feb 2009 09:33:13 -0800 (PST)
Subject: pymssql text type
Message-ID: <851ed9db-2561-48ad-b54c-95f96a7fa42d@q9g2000yqc.googlegroups.com>

Hi, I'm trying to pass a text blob to MS SQL Express 2008 but get the
follwoing error.

(<class 'pymssql.OperationalError'>, OperationalError("SQL Server
message 102, severity 15, state 1, line 1:\nIncorrect syntax near
'assigned'.\n",), <traceback object at 0x044ABDF0>)

the string it is having an issue with is

(\r\n\r\n\tLogon ID:\t\t(0x0,0xE892A8)\r\n\r\n\tLogon Type:\t2\r\n\r
\n')

It looks like SQL is reading the blob, finding the newline codes and
generating an error.  Is there anyway I can get it to ignore the text
and just enter the whole sentance as a string.  I think that some
automatic character encodign might be taking place hence the string is
being read but I can work out whether I need to character encode in
Python, change a table setting in SQL or do something to pymssql.

Thanks, Marc.


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 12:38:27 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 18:38:27 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <mailman.368.1235149466.11746.python-list@python.org>
References: <mailman.114.1234882494.11746.python-list@python.org>	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>	<499eaa34$0$21372$426a74cc@news.free.fr>	<mailman.353.1235142977.11746.python-list@python.org>	<499ed41c$0$15309$426a74cc@news.free.fr>
	<mailman.368.1235149466.11746.python-list@python.org>
Message-ID: <499eea77$0$4840$426a74cc@news.free.fr>

Paddy O'Loughlin a ?crit :
> 2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>>> Interesting. Why shouldn't you?
>>> I haven't used the property() function
>> s/function/object/
> 
> Nice try, but what I wrote was what I intended to say:
> http://docs.python.org/library/functions.html#property

Check by yourself:

 >>> import inspect
 >>> inspect.isfunction(property)
False
 >>> property()
<property object at 0xb7cbc144>
 >>> dir(property)
['__class__', '__delattr__', '__delete__', '__doc__', '__get__', 
'__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', 
'__reduce_ex__', '__repr__', '__set__', '__setattr__', '__str__', 
'fdel', 'fget', 'fset']
 >>>


>> The case is that the whole point of using a computed attribute is to perform
>> some computation on the value. IOW, except for a couple corner cases, only
>> the accessors should directly access the implementation(s) attributes(s).
>>
>> And of course, like for any other GoldenRule(tm), it's not meant to be
>> blindly followed. It's just that most of the times, going thru the accessors
>> is really what you want - even from within the class code.
> 
> Hmm, it doesn't seem to me like it's much of a big deal, for it to
> described as anything like a "GoldenRule"

One could say the same for each and any of the usual GoldenRules(tm).


From bing.liu at gmail.com  Fri Feb 20 12:47:06 2009
From: bing.liu at gmail.com (david)
Date: Fri, 20 Feb 2009 09:47:06 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
Message-ID: <3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>

>
> No: please explain in more detail what you want to do.
>
> --
> Gabriel Genellina

Thanks for the fast reply Gabriel,
Basically I have some python scripts to do some document processing,
all in command line tho.
I want to have an C++ application so that my scripts can run in dialogs
(API).
I saw a post before using c# to run python scripts within the c# main.
I am willing to run my python scripts within c++.
Thanks.


From thorsten at thorstenkampe.de  Fri Feb 20 12:54:11 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Fri, 20 Feb 2009 18:54:11 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <MPG.24090cad6756ba449897c5@news.individual.de>

* Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
> mu at the beginning (it's pronounced micro-wiki). 

No, it's not. I suggest you start your Unicode adventure by configuring 
your newsreader.

Thorsten


From aahz at pythoncraft.com  Fri Feb 20 13:07:15 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 Feb 2009 10:07:15 -0800
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <gnmrgj$ltv$1@panix3.panix.com>

In article <pan.2009.02.10.21.58.36 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>
>As I understand it, there's very little benefit to multi-cores in Python 
>due to the GIL. 

As phrased, your statement is completely wrong.  Here's a more correct
phrasing: "For threaded compute-bound applications written in pure
Python, there's very little benefit to multiple cores."  But threaded
I/O-bound applications do receive some benefit from multiple cores, and
using multiple processes certainly leverages multiple cores.  If boosting
the performance of a threaded compute-bound application is important, one
can always write the critical parts in C/C++.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From google at mrabarnett.plus.com  Fri Feb 20 13:08:18 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 20 Feb 2009 18:08:18 +0000
Subject: To unicode or not to unicode
In-Reply-To: <MPG.24090cad6756ba449897c5@news.individual.de>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
Message-ID: <499EF192.5010300@mrabarnett.plus.com>

Thorsten Kampe wrote:
> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
>> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
>> mu at the beginning (it's pronounced micro-wiki). 
> 
> No, it's not. I suggest you start your Unicode adventure by configuring 
> your newsreader.
> 
It looked like mu to me, but you're correct: it's "MICRO SIGN", not
"GREEK SMALL LETTER MU".


From jimzat at iname.com  Fri Feb 20 13:11:39 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 10:11:39 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<eaeaa3de-bac1-44aa-a3dd-f35e3d63248a@b38g2000prf.googlegroups.com>
Message-ID: <5ca84e48-07a1-426f-b3c9-580c8dc7f151@k19g2000prh.googlegroups.com>

On Feb 20, 11:22?am, koranthala <koranth... at gmail.com> wrote:
>
> thread.setDaemon(True)
> Makes it a daemon thread which means that interpreter will not stay
> alive if only that thread is alive.

My main window is used to launch multiple children and therefore when
one is dismissed the interpreter will remain active.


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 13:12:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 16:12:17 -0200
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
	<3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>
Message-ID: <op.upnwurvzx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 15:47:06 -0200, david <bing.liu at gmail.com> escribi?:

> Basically I have some python scripts to do some document processing,
> all in command line tho.
> I want to have an C++ application so that my scripts can run in dialogs
> (API).
> I saw a post before using c# to run python scripts within the c# main.
> I am willing to run my python scripts within c++.
> Thanks.

So you want to execute a Python script, in a different process, as if you  
typed the command line?
That's not different to executing any other external program in C# - in  
fact is a C# question, no Python involved. Try something like this:

     Process p = new Process();
     p.StartInfo.FileName = "path\to\python.exe";
     p.StartInfo.Arguments = "path\to\your\script.py other arguments";
     p.Start();
     p.WaitForExit();
     p.Close()

There are other properties you may want to use, like  
RedirectStandardOutput; see the C# documentation.

-- 
Gabriel Genellina



From jimzat at iname.com  Fri Feb 20 13:15:10 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 10:15:10 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<mailman.370.1235150534.11746.python-list@python.org>
Message-ID: <df56c9b4-5d0b-45c8-9e50-52c2e6c181c5@d2g2000pra.googlegroups.com>

On Feb 20, 11:21?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> 1) make the child window set a flag in the thread (let's say, t.terminate ?
> = True). And make the polling thread check the flag periodically (you ?
> possibly already have a loop there - just break the loop when you detect ?
> that self.terminate became true)
>
> 2) catching an exception is as easy as enclosing the code in a try/except ?
> block. And "commit suicide" is just "exit from the run() method".

Gabriel,

I am using the thread module and calling thread.start_new_thread
(...).  If I use t=thread.start_new_thread(...) and later set
t.terminate, I get "AttributeError: 'int' object has no attribute
'terminate'"

What is the proper way to do this?  I don't want to use globals as I
will have multiple child windows of various classes.




From bing.liu at gmail.com  Fri Feb 20 13:16:08 2009
From: bing.liu at gmail.com (david)
Date: Fri, 20 Feb 2009 10:16:08 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
	<3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>
	<mailman.374.1235153565.11746.python-list@python.org>
Message-ID: <074c3462-a7da-4426-bcdd-387f9eb19811@x9g2000yqk.googlegroups.com>

On Feb 20, 11:12?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 20 Feb 2009 15:47:06 -0200, david <bing.... at gmail.com> escribi?:
>
> > Basically I have some python scripts to do some document processing,
> > all in command line tho.
> > I want to have an C++ application so that my scripts can run in dialogs
> > (API).
> > I saw a post before using c# to run python scripts within the c# main.
> > I am willing to run my python scripts within c++.
> > Thanks.
>
> So you want to execute a Python script, in a different process, as if you ?
> typed the command line?
> That's not different to executing any other external program in C# - in ?
> fact is a C# question, no Python involved. Try something like this:
>
> ? ? ?Process p = new Process();
> ? ? ?p.StartInfo.FileName = "path\to\python.exe";
> ? ? ?p.StartInfo.Arguments = "path\to\your\script.py other arguments";
> ? ? ?p.Start();
> ? ? ?p.WaitForExit();
> ? ? ?p.Close()
>
> There are other properties you may want to use, like ?
> RedirectStandardOutput; see the C# documentation.
>
> --
> Gabriel Genellina

Thanks so much. I'll give it a try :)
Best Regards.

David


From tim.wintle at teamrubber.com  Fri Feb 20 13:22:27 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 20 Feb 2009 18:22:27 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <499EDC7A.80201@wiggly.org>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
	<b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
	<499EDC7A.80201@wiggly.org>
Message-ID: <1235154147.8441.31.camel@tim-laptop>

On Fri, 2009-02-20 at 16:38 +0000, Nigel Rantor wrote:
> Luke Dunn wrote:

<snip>

That was my initial thought when I read this too - but I'm not certain
that is guaranteed to find a solution (i.e. a solution that's optimal).

I'd welcome a proof that it will though, a few minutes thought hasn't
found a counter-example.

> > yes power towers are allowed
> 
> right, okay, without coding it here's my thought.
> 
> factorise the numbers you have but only allowing primes that exist in 
> your digit set.
> 
> then take that factorisation and turn any repeated runs of digits 
> multiplied by themselves into power-towers
> 
> any remainder can then be created in other ways, starting with a way 
> other than exponentiation that is able to create the largest number, 
> i.e. multiplication, then addition...
> 
> I've not got time to put it into code right now  but it shouldn't be too 
> hard...
> 
> e.g.
> 
> digits : 3, 2, 1
> 
> n : 10
> 10 = 2*5 - but we don't have 5...
> 10 = 3*3 + 1
> 10 = 3^2+1
> 3 digits
> 
> n : 27
> 27 = 3*3*3
> 27 = 3^3
> 2 digits
> 
> n : 33
> 33 = 3*3*3 + 6
> 33 = 3*3*3 + 3*2
> 33 = 3^3+3*2
> 4 digits
> 
> > exponentiation, multiplication, division, addition and subtraction. 
> > Brackets when necessary but length is sorted on number of digits not 
> > number of operators plus digits.
> >  
> > I always try my homework myself first. in 38 years of life I've 
> > learned only to do what i want, if I wanted everyone else to do my work 
> > for me I'd be a management consultant !
> > On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com 
> > <mailto:luke.dunn at gmail.com>> wrote:
> > 
> >     I am teaching myself coding. No university or school, so i guess its
> >     homework if you like. i am interested in algorithms generally, after
> >     doing some of Project Euler. Of course my own learning process is
> >     best served by just getting on with it but sometimes you will do
> >     that while other times you might just choose to ask for help. if no
> >     one suggests then i will probably shelve it and come back to it
> >     myself when I'm fresh.
> >      
> >     no it's not a real world problem but my grounding is in math so i
> >     like pure stuff anyway. don't see how that is a problem, as a math
> >     person i accept the validity of pure research conducted just for
> >     curiosity and aesthetic satisfaction. it often finds an application
> >     later anyway
> >      
> >     Thanks for your helpful suggestion of trying other methods and i
> >     will do that in time. my motive was to share an interesting problem
> >     because a human of moderate math education can sit down with this
> >     and find minimal solutions easily but the intuition they use is
> >     quite subtle, hence the idea of converting the human heuristic into
> >     an algorithm became of interest, and particularly a recursive one. i
> >     find that the development of a piece of recursion usually comes as
> >     an 'aha', and since i hadn't had such a moment, i thought i'd turn
> >     the problem loose on the public. also i found no online reference to
> >     this problem so it seemed ripe for sharing.
> > 
> >     On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org
> >     <mailto:wiggly at wiggly.org>> wrote:
> > 
> >         Trip Technician wrote:
> > 
> >             anyone interested in looking at the following problem.
> > 
> > 
> >         if you can give me a good reason why this is not homework I'd
> >         love to hear it...I just don't see how this is a real problem.
> > 
> > 
> >             we are trying to express numbers as minimal expressions
> >             using only the
> >             digits one two and three, with conventional arithmetic. so for
> >             instance
> > 
> >             33 = 2^(3+2)+1 = 3^3+(3*2)
> > 
> >             are both minimal, using 4 digits but
> > 
> >             33 = ((3+2)*2+1)*3
> > 
> >             using 5 is not.
> > 
> >             I have tried coding a function to return the minimal
> >             representation
> >             for any integer, but haven't cracked it so far. The naive first
> >             attempt is to generate lots of random strings, eval() them
> >             and sort by
> >             size and value. this is inelegant and slow.
> > 
> > 
> >         Wow. Okay, what other ways have you tried so far? Or are you
> >         beating your head against the "search the entire problem space"
> >         solution still?
> > 
> >         This problem smells a lot like factorisation, so I would think
> >         of it in terms of wanting to reduce the target number using as
> >         few operations as possible.
> > 
> >         If you allow exponentiation that's going to be your biggest
> >         hitter so you know that the best you can do using 2 digits is
> >         n^n where n is the largest digit you allow yourself.
> > 
> >         Are you going to allow things like n^n^n or not?
> > 
> >          n
> > 
> > 
> > 
> > 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From aisaac at american.edu  Fri Feb 20 13:27:33 2009
From: aisaac at american.edu (Alan Isaac)
Date: Fri, 20 Feb 2009 18:27:33 GMT
Subject: is it possible to add a property to an instance?
In-Reply-To: <g64mbt$ssa$1@ruby.cit.cornell.edu>
References: <g64jda$nr1$1@ruby.cit.cornell.edu>
	<2dda482a-d15c-4f8d-9fca-3bfffe9e4fa1@f63g2000hsf.googlegroups.com>
	<g64mbt$ssa$1@ruby.cit.cornell.edu>
Message-ID: <pCCnl.598$Ez6.203@nwrddc02.gnilink.net>

Darren Dale wrote to GHUM:
> Sorry, that's an attribute, not a property.


This is a question about terminology.
In contrast to Darren's recommended usage,
I have run into the following.

If hasattr(x,'a') is True, for instance object `x`,
then `a` is an attribute of `x`.
Attributes are data attributes or callable attributes.
Data attributes are variables or properties.
Callable attributes are usually method attributes.

This seemed about right to me, but a better
(or "official") taxonomy would be welcome.

Thanks,
Alan Isaac


From aaron.hildebrandt at gmail.com  Fri Feb 20 13:28:34 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 10:28:34 -0800 (PST)
Subject: Find the location of a loaded module
Message-ID: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>

I'm running into a problem that's rapidly reaching keyboard-smashing
levels. I'm trying to import a module into Python, but it seems like
Python is almost randomly loading the module from an entirely
different directory, one that shouldn't be in the module search path.

When I tell Python to load a module, is there a way to tell which
directory the module was loaded from?


From lists at cheimes.de  Fri Feb 20 13:39:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 19:39:51 +0100
Subject: Find the location of a loaded module
In-Reply-To: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
Message-ID: <gnmtdn$eca$1@ger.gmane.org>

Aaron Scott schrieb:
> I'm running into a problem that's rapidly reaching keyboard-smashing
> levels. I'm trying to import a module into Python, but it seems like
> Python is almost randomly loading the module from an entirely
> different directory, one that shouldn't be in the module search path.
> 
> When I tell Python to load a module, is there a way to tell which
> directory the module was loaded from?

All except builtin modules have an attribute __file__ that points to the
file.

Christian



From patrick.oloughlin at gmail.com  Fri Feb 20 13:45:16 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 18:45:16 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499eea77$0$4840$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
	<499ed41c$0$15309$426a74cc@news.free.fr>
	<mailman.368.1235149466.11746.python-list@python.org>
	<499eea77$0$4840$426a74cc@news.free.fr>
Message-ID: <cc34a9320902201045p32f2c418w884de263ca67cf95@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
> Check by yourself:
>
>>>> import inspect
>>>> inspect.isfunction(property)
> False
Using this, every single builtin function returns False. That's a
pretty limited definition to be being pedantic over, especially when
they are in the "Built-in Functions" section of the manual.

>>>> property()
> <property object at 0xb7cbc144>
I never said that calling it didn't return a property object :)

>>> property
<type 'property'>

So it's a type.
I think I didn't make such a bad error on my part. My intent in what I
was saying was to indicate that I hadn't created a property type. It's
fair enough to consider type constructors as functions given how they
are listed as such by the python documentation.
I don't think that your correction was much help, unless you just want
to say that everything is an object. Maybe you'd be right, but it's
not much use to use the term that way, imo

<shrug>

>>>> dir(property)
> ['__class__', '__delattr__', '__delete__', '__doc__', '__get__',
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__set__', '__setattr__', '__str__', 'fdel',
> 'fget', 'fset']

Doesn't prove a whole lot. So types have attributes...
So do functions:
>>> def myfunc():
...     pass
...
>>> dir(myfunc)
['__call__', '__class__', '__delattr__', '__dict__', '__doc__',
'__get__', '__getattribute__', '__hash__', '__init__', '__module__',
'__name__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
'__setattr__', '__str__', 'func_closure', 'func_code',
'func_defaults', 'func_dict', 'func_doc', 'func_globals', 'func_name']


>> Hmm, it doesn't seem to me like it's much of a big deal, for it to
>> described as anything like a "GoldenRule"
>
> One could say the same for each and any of the usual GoldenRules(tm).
Not really. To do so would be over-generalising and not useful to discussion
I guess it's your pedantry that I'm questioning.
Something like "don't use goto's" works as a GoldenRule because it's
been observed that without it, people start using goto statements in
places where it's not really appropriate.
When you said that "[you] usually shouldn't [use properties] - unless
you have a very compelling reason", your tone implied that properties
are easy to misuse and tend to be.
Not being familiar with properties and seeing them as being pretty
harmless, I was intrigued by this, which is why I asked for an
explanation.
Your explanation seems to show that your tone was likely to be more
personal bias than any real issue with properties.

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From aisaac at american.edu  Fri Feb 20 13:49:21 2009
From: aisaac at american.edu (Alan Isaac)
Date: Fri, 20 Feb 2009 18:49:21 GMT
Subject: function factory question: embed current values of object attributes
Message-ID: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>

I have a class `X` where many parameters are set
at instance initialization.  The parameter values
of an instance `x` generally remain unchanged,
but is there way to communicate to a method that
it depends only on the initial values of these parameters
(and does not need to worry about any changes)?

The behavior of method `m` depends on these parameter values.
It turns out `m` gets called a lot, which means
that the pameter values are accessed over and over
(self.p0, self.p1, etc).  I would like to
manufacture a function equivalent to the method
that simply uses fixed values (the values at the
time it is manufactured).  I do not care if this
function is attached to `x` or not.

I have a feeling that I am turning something simple
into something complex, perhaps for lack of an
afternoon coffee or lack of CS training.  Suggestions
appreciated.

Alan Isaac


From aaron.hildebrandt at gmail.com  Fri Feb 20 13:53:58 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 10:53:58 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
Message-ID: <a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com>

Okay, I'm going out of my mind. I have three directories -- 'act1',
'act2', and 'act3'. Each of these has a module named 'story'.

Through mod_python, I need to load 'story' in the directory 'act1'. I
do it like this:

	req.content_type = "text/html"
	sys.path.append(os.path.dirname( __file__ ))
	req.write(str(sys.path))
	import story
	req.write(story.game.Save())
	sys.path.pop()

According to sys.path, these are Python's paths:

['/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/python2.5/
plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/python2.5/lib-
dynload', '/usr/lib/python2.5/site-packages', '/usr/local/python2.5.2/
lib/python2.5/', '/home/www/---/docs/act1']

story.game.Save() returns the location of the story.game module, which
is reported as '/home/www/---/docs/act1/story/game.pyc'. So far so
good.

Now, I'll try the same thing from the 'act2' directory. These are the
paths reported in sys.path:

['/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/python2.5/
plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/python2.5/lib-
dynload', '/usr/lib/python2.5/site-packages', '/usr/local/python2.5.2/
lib/python2.5/', '/home/www/---/docs/act2']

All good, right? Not so fast. Here's what story.game.Save() returns as
its location: '/home/www/---/docs/act1/story/game.pyc'.

Which means it's loading the 'story' module from the old location,
even though that location is no longer in the path.

If I refresh a couple times, eventually it loads the module from the
proper directory ('act2'). Then, I'll go back to the first directory,
and find that it too will be loading the module from 'act2'. I'll
refresh, and it'll load from 'act1' again. I'll refresh a couple
times, and suddenly it's loading from 'act2' again.

I'm seriously going insane. If anyone has any insight, please, please
share it with me.

Aaron


From umarpy at googlemail.com  Fri Feb 20 14:11:11 2009
From: umarpy at googlemail.com (umarpy at googlemail.com)
Date: Fri, 20 Feb 2009 11:11:11 -0800 (PST)
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net> 
	<gnkdal$bcq$01$1@news.t-online.com>
	<rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net> 
	<mailman.346.1235135052.11746.python-list@python.org>
Message-ID: <18ff6125-1b25-48ff-b6c5-8accec79b69d@u38g2000yqe.googlegroups.com>


More elegant way

>>> [x for x in re.split('([A-Z]+[a-z]+)', a) if x ]
['foo', 'Bar', 'Baz']

R.

On Feb 20, 2:03?pm, Lie Ryan <lie.1... at gmail.com> wrote:
> On Thu, 19 Feb 2009 13:03:59 -0800, Ron Garret wrote:
> > In article <gnkdal$bcq$0... at news.t-online.com>,
> > ?Peter Otten <__pete... at web.de> wrote:
>
> >> Ron Garret wrote:
>
> >> > I'm trying to split a CamelCase string into its constituent
> >> > components.
>
> >> How about
>
> >> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
> >> ['foo', 'Bar', 'Baz']
>
> > That's very clever. ?Thanks!
>
> >> > (BTW, I tried looking at the source code for the re module, but I
> >> > could not find the relevant code. ?re.split calls
> >> > sre_compile.compile().split, but the string 'split' does not appear
> >> > in sre_compile.py. ?So where does this method come from?)
>
> >> It's coded in C. The source is Modules/sremodule.c.
>
> > Ah. ?Thanks!
>
> > rg
>
> This re.split() doesn't consume character:
>
> >>> re.split('([A-Z][a-z]*)', 'fooBarBaz')
>
> ['foo', 'Bar', '', 'Baz', '']
>
> it does what the OP wants, albeit with extra blank strings.



From invalid at invalid  Fri Feb 20 14:20:48 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 20 Feb 2009 13:20:48 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
Message-ID: <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>

On 2009-02-20, Aahz <aahz at pythoncraft.com> wrote:
> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>
>> As I understand it, there's very little benefit to multi-cores
>> in Python due to the GIL. 
>
> As phrased, your statement is completely wrong.  Here's a more
> correct phrasing: "For threaded compute-bound applications
> written in pure Python, there's very little benefit to
> multiple cores." But threaded I/O-bound applications do
> receive some benefit from multiple cores, and using multiple
> processes certainly leverages multiple cores.  If boosting the
> performance of a threaded compute-bound application is
> important, one can always write the critical parts in C/C++.

Do the crunchy bits of scipy/numpy, scientific python, vtk and
other compute-intensive libraries tend to release the GIL while
they're busy "computing"?

[Perhaps using them doesn't count as "pure Python", but...]

-- 
Grant Edwards                   grante             Yow! NEWARK has been
                                  at               REZONED!!  DES MOINES has
                               visi.com            been REZONED!!


From rNOSPAMon at flownet.com  Fri Feb 20 14:21:02 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 11:21:02 -0800
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
Message-ID: <rNOSPAMon-71D951.11210220022009@news.gha.chartermi.net>

In article <mailman.373.1235153296.11746.python-list at python.org>,
 MRAB <google at mrabarnett.plus.com> wrote:

> Thorsten Kampe wrote:
> > * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> >> I'm writing a little wiki that I call ??Wiki.  That's a lowercase Greek 
> >> mu at the beginning (it's pronounced micro-wiki). 
> > 
> > No, it's not. I suggest you start your Unicode adventure by configuring 
> > your newsreader.
> > 
> It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> "GREEK SMALL LETTER MU".

Heh, I didn't know that those two things were distinct.  Learn something 
new every day.

rg


From rNOSPAMon at flownet.com  Fri Feb 20 14:48:45 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 11:48:45 -0800
Subject: What encoding does u'...' syntax use?
Message-ID: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>

I would have thought that the answer would be: the default encoding 
(duh!)  But empirically this appears not to be the case:

>>> unicode('\xb5')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
ordinal not in range(128)
>>> u'\xb5'
u'\xb5'
>>> print u'\xb5'
?

(That last character shows up as a micron sign despite the fact that my 
default encoding is ascii, so it seems to me that that unicode string 
must somehow have picked up a latin-1 encoding.)

rg


From martin at v.loewis.de  Fri Feb 20 15:05:04 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Fri, 20 Feb 2009 21:05:04 +0100
Subject: To unicode or not to unicode
In-Reply-To: <mailman.373.1235153296.11746.python-list@python.org>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
Message-ID: <499F0CF0.8070800@v.loewis.de>

MRAB wrote:
> Thorsten Kampe wrote:
>> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
>>> I'm writing a little wiki that I call ?Wiki.  That's a lowercase
>>> Greek mu at the beginning (it's pronounced micro-wiki). 
>>
>> No, it's not. I suggest you start your Unicode adventure by
>> configuring your newsreader.
>>
> It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> "GREEK SMALL LETTER MU".

I don't think that was the complaint. Instead, the complaint was
that the OP's original message did not have a Content-type header,
and that it was thus impossible to tell what the byte in front of
"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
MU in a usenet or email message, you really must use MIME. (As both
your article and Thorsten's did, by choosing UTF-8)

Regards,
Martin

P.S. The difference between MICRO SIGN and GREEK SMALL LETTER MU
is nit-picking, IMO:

py> unicodedata.name(unicodedata.normalize("NFKC", u"\N{MICRO SIGN}"))
'GREEK SMALL LETTER MU'


From rNOSPAMon at flownet.com  Fri Feb 20 15:19:13 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 12:19:13 -0800
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
Message-ID: <rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>

In article <499F0CF0.8070800 at v.loewis.de>,
 "Martin v. L??wis" <martin at v.loewis.de> wrote:

> MRAB wrote:
> > Thorsten Kampe wrote:
> >> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> >>> I'm writing a little wiki that I call ??Wiki.  That's a lowercase
> >>> Greek mu at the beginning (it's pronounced micro-wiki). 
> >>
> >> No, it's not. I suggest you start your Unicode adventure by
> >> configuring your newsreader.
> >>
> > It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> > "GREEK SMALL LETTER MU".
> 
> I don't think that was the complaint. Instead, the complaint was
> that the OP's original message did not have a Content-type header,

I'm the OP.  I'm using MT-Newswatcher 3.5.1.  I thought I had it 
configured properly, but I guess I didn't.  Under 
Preferences->Languages->Send Messages with Encoding I had selected 
latin-1.  I didn't know I also needed to have MIME turned on for that to 
work.  I've turned it on now.  Is this better?

This should be a micro sign: ??

rg


From aaron.hildebrandt at gmail.com  Fri Feb 20 15:23:03 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 12:23:03 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com>
Message-ID: <1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com>

Here's another clue: if I'm trying to run the script from the
directory 'act1', but it's loading the module from 'act2', if I rename
the module directory in 'act2' and refresh, the module still reports
that it's running from '/home/www/---/docs/act2/story/game.pyc'...
even though that files no longer exists. If I refresh a few more
times, both 'act1' and 'act2' will load the module from 'act1's
directory (even though the directory doesn't appear in sys.path when
you try to load it from 'act2').

So, Python is trying to import a module from a directory that isn't in
sys.path, and will generally default to running the module from the
directory where it was last run. If I run it from 'act1', then 'act2',
both times it will load the module from 'act1'. If I do it the other
way around, it will load the module from 'act2' both times.

The question now is... why is it loading from a directory that isn't
in sys.path? How can I avoid this?


From rushenaly at gmail.com  Fri Feb 20 15:35:58 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Fri, 20 Feb 2009 12:35:58 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com> 
	<be4c6e60-518d-42e5-972a-ad0b91c4e22a@a12g2000yqm.googlegroups.com>
Message-ID: <c7cf2312-db2f-41fc-b523-e764007e43df@v15g2000yqn.googlegroups.com>

I want to correct my last post where i said that there is not any
intend to remove GIL from python. There is an intend actually i wish
from a wizard :).
On the pypy blog there is an explanation about gil and pypy
"Note that multithreading in PyPy is based on a global interpreter
lock, as in CPython. I imagine that we will get rid of the global
interpreter lock at some point in the future -- I can certainly see
how this might be done in PyPy, unlike in CPython -- but it will be a
lot of work nevertheless. Given our current priorities, it will
probably not occur soon unless someone steps in."
Nothing new about GIL and Cpython and even PyPy

Thank you...
Rushen

Thank you...


From martin at v.loewis.de  Fri Feb 20 15:41:18 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 20 Feb 2009 21:41:18 +0100
Subject: To unicode or not to unicode
In-Reply-To: <rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
	<rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>
Message-ID: <499F156E.3030902@v.loewis.de>

Ron Garret wrote:
> In article <499F0CF0.8070800 at v.loewis.de>,
>  "Martin v. L??wis" <martin at v.loewis.de> wrote:
> 
> 
> I'm the OP.  I'm using MT-Newswatcher 3.5.1.  I thought I had it 
> configured properly, but I guess I didn't.

Probably you did. However, it then means that the newsreader is crap.

> Under 
> Preferences->Languages->Send Messages with Encoding I had selected 
> latin-1.

That sounds like early nineties, before the invention of MIME.

> I didn't know I also needed to have MIME turned on for that to 
> work.  I've turned it on now.  Is this better?
> 
> This should be a micro sign: ??

Not really (it's worse, from my point of view - but might be better
for others). You are now sending in UTF-8, but there is still no
MIME declaration in the news headers. As a consequence, my newsreader
continues to interpret it as Latin-1 (which it assumes as the default
encoding), and it comes out as moji-bake (in responding, my reader
should declare the encoding properly, so you should see what I see,
namely A-circumflex, micro sign)

If you look at the message headers / message source as sent e.g.
by MRAB, you'll notice lines like

MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

These lines are missing from your posting.

Assuming the newsreader is not crap, it might help to set the default
send encoding to ASCII. When sending micro sign, the newsreader might
infer that ASCII is not good enough, and use MIME - although it then
still needs to pick an encoding.

Regards,
Martin


From nad at acm.org  Fri Feb 20 15:48:46 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 20 Feb 2009 12:48:46 -0800
Subject: Framework installation of 2.6 on OS X, with specified prefix
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
Message-ID: <nad-2C4315.12484620022009@news.gmane.org>

In article <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F at gmail.com>,
 Evert Rol <evert.rol at gmail.com> wrote:
> I'm trying to install Python 2.6 from source on Mac OS X.5, in its own  
> directory using a framework install. That goes fine, up to the point  
> where it wants to install the applications that come with it (eg, the  
> Wish shell): it tries to install things into /Applications, instead of  
> eg <prefix>/Applications.
> Here's my configure line (the flags are there just to let it find my  
> own installed readline):
> 
> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
> enable-shared --enable-framework=/sw/Library/Frameworks --with- 
> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
> 
> 
> And the last part of the output of 'make install':
> 
> ../python.exe ./scripts/BuildApplet.py \
> 		--destroot "" \
> 		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/ 
> MacOS/Python-32" && echo "-32"`  \
> 		--output "/sw/Applications/Python 2.6/Build Applet.app" \
> 		./scripts/BuildApplet.py
> cd PythonLauncher && make install DESTDIR=
> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
> 2.6"
> mkdir: /Applications/Python 2.6: Permission denied
> make[2]: *** [install] Error 1
> make[1]: *** [install_PythonLauncher] Error 2
> make: *** [frameworkinstallapps] Error 2
> 
> Is there an option on the configure line that I need to set, or  
> something in setup.py? Or perhaps hack the Makefile?

FWIW, the OS X build-installer.py script handles this by specifying a 
DESTDIR on the make install steps rather than including a --prefix on 
the configure.   See Mac/BuildScript/build-installer.py.

-- 
 Ned Deily,
 nad at acm.org



From stefan_ml at behnel.de  Fri Feb 20 15:55:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 20 Feb 2009 21:55:25 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
Message-ID: <499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>

Ron Garret wrote:
> I would have thought that the answer would be: the default encoding 
> (duh!)  But empirically this appears not to be the case:
> 
>>>> unicode('\xb5')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> ordinal not in range(128)
>>>> u'\xb5'
> u'\xb5'
>>>> print u'\xb5'
> ?
> 
> (That last character shows up as a micron sign despite the fact that my 
> default encoding is ascii, so it seems to me that that unicode string 
> must somehow have picked up a latin-1 encoding.)

You are mixing up console output and internal data representation. What you
see in the last line is what the Python interpreter makes of your unicode
string when passing it into stdout, which in your case seems to use a
latin-1 encoding (check your environment settings for that).

BTW, Unicode is not an encoding. Wikipedia will tell you more.

Stefan


From stefan_ml at behnel.de  Fri Feb 20 15:58:59 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 20 Feb 2009 21:58:59 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <499f1993$0$31879$9b4e6d93@newsspool3.arcor-online.net>

Stefan Behnel wrote:
>>>>> print u'\xb5'
>> ?
> 
> What you
> see in the last line is what the Python interpreter makes of your unicode
> string when passing it into stdout, which in your case seems to use a
> latin-1 encoding (check your environment settings for that).

The "seems to" is misleading. The example doesn't actually tell you
anything about the encoding used by your console, except that it can
display non-ASCII characters.

Stefan


From dotancohen at gmail.com  Fri Feb 20 16:09:13 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 20 Feb 2009 23:09:13 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
Message-ID: <880dece00902201309i1a12bd79qc79aa06b58f11176@mail.gmail.com>

> Even 3DS or Maya is easier to learn that Blender.
>

Notepad is easier to learn that VI. Not a good program does simple make.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From rNOSPAMon at flownet.com  Fri Feb 20 16:15:51 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 13:15:51 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>

In article <499f18bd$0$31879$9b4e6d93 at newsspool3.arcor-online.net>,
 Stefan Behnel <stefan_ml at behnel.de> wrote:

> Ron Garret wrote:
> > I would have thought that the answer would be: the default encoding 
> > (duh!)  But empirically this appears not to be the case:
> > 
> >>>> unicode('\xb5')
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> > UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> > ordinal not in range(128)
> >>>> u'\xb5'
> > u'\xb5'
> >>>> print u'\xb5'
> > ?
> > 
> > (That last character shows up as a micron sign despite the fact that my 
> > default encoding is ascii, so it seems to me that that unicode string 
> > must somehow have picked up a latin-1 encoding.)
> 
> You are mixing up console output and internal data representation. What you
> see in the last line is what the Python interpreter makes of your unicode
> string when passing it into stdout, which in your case seems to use a
> latin-1 encoding (check your environment settings for that).
> 
> BTW, Unicode is not an encoding. Wikipedia will tell you more.

Yes, I know that.  But every concrete representation of a unicode string 
has to have an encoding associated with it, including unicode strings 
produced by the Python parser when it parses the ascii string "u'\xb5'"

My question is: what is that encoding?  It can't be ascii.  So what is 
it?

Put this another way: I would have thought that when the Python parser 
parses "u'\xb5'" it would produce the same result as calling 
unicode('\xb5'), but it doesn't.  Instead it seems to produce the same 
result as calling unicode('\xb5', 'latin-1').  But my default encoding 
is not latin-1, it's ascii.  So where is the Python parser getting its 
encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
calling unicode('\xb5')?

rg


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:16:26 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:16:26 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com> 
	<1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com>
Message-ID: <28aba044-d927-499b-8bd2-525870ae0267@j1g2000yqi.googlegroups.com>

And more madness...

Executed from inside 'act1', which contains the directory / module
'story':


	directory = os.path.dirname(__file__)
	req.write(str(directory))
	story = apache.import_module('story', path=[directory])


Results:


  File "/home/www/---/docs/act1/play.py", line 24, in Rebuild
    storylab = apache.import_module('story', path=[directory])

  File "/usr/local/python2.5.2/lib/python2.5/site-packages/mod_python/
importer.py", line 304, in import_module
    return __import__(module_name, {}, {}, ['*'])

ImportError: No module named story


Awesome. I'm going to go stick my head through a wall.


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:24:00 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:24:00 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com> 
	<1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com> 
	<28aba044-d927-499b-8bd2-525870ae0267@j1g2000yqi.googlegroups.com>
Message-ID: <e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com>

Son of a bitch. It gets worse.

> Executed from inside 'act1', which contains the directory / module
> 'story':
>
> ? ? ? ? directory = os.path.dirname(__file__)
> ? ? ? ? req.write(str(directory))
> ? ? ? ? story = apache.import_module('story', path=[directory])
>
> Results:
>
>   /home/www/---/docs/act1
>
> ? File "/home/www/---/docs/act1/play.py", line 24, in Rebuild
> ? ? storylab = apache.import_module('story', path=[directory])
>
> ? File "/usr/local/python2.5.2/lib/python2.5/site-packages/mod_python/
> importer.py", line 304, in import_module
> ? ? return __import__(module_name, {}, {}, ['*'])
>
> ImportError: No module named story
>

If I execute the exact same code from the 'act1' directory after
running it from the 'act2' directory, it successfully loads the
'story' module... from 'act2'. Even though I used the Apache importer
to specify the EXACT LOCATION of the module to import.

'req.write(str(os.path.dirname(__file__)))' returns '/home/www/---/
docs/act1'.

'req.write(story.game.Save())' returns '/home/www/--/docs/act2/
storylab/game.pyc' as the file being accessed.

BLOODY HELL.

Okay, deep breath.

Does anyone know what's going on? Am I just not understanding how
module importing in mod_python works? I'd really appreciate help,
since I'll be stuck at work today until I can get this sorted out, and
I've long since run out of ideas.


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:24:52 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:24:52 -0800 (PST)
Subject: Find the location of a loaded module
References: e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com
Message-ID: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>

>
> 'req.write(story.game.Save())' returns '/home/www/--/docs/act2/
> storylab/game.pyc' as the file being accessed.
>

Sorry, that should have read:
> 'req.write(story.game.Save())' returns '/home/www/--/docs/act2/story/game.pyc' as the file being accessed.


From tjreedy at udel.edu  Fri Feb 20 16:26:55 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 16:26:55 -0500
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
Message-ID: <gnn770$g43$1@ger.gmane.org>

Alan Isaac wrote:
> I have a class `X` where many parameters are set
> at instance initialization.  The parameter values
> of an instance `x` generally remain unchanged,

'Parameters' are the function local names in the header that get bound 
to argument objects when the function is called.  What you are 
describing are 'attributes'.

> but is there way to communicate to a method that
> it depends only on the initial values of these parameters
> (and does not need to worry about any changes)?

In the terms stated, no.

> The behavior of method `m` depends on these parameter values.
> It turns out `m` gets called a lot, which means
> that the pameter values are accessed over and over
> (self.p0, self.p1, etc).  I would like to
> manufacture a function equivalent to the method
> that simply uses fixed values (the values at the
> time it is manufactured).

You are now describing a function closure.  Here is an example that 
might help.

def f_maker(a1, a2):
   def _(b): return a1*b + a2
   return _

class C:
   def __init__(self, attr1, attr2):
     self.attr1 = attr1
     self.attr2 = attr2
     self.f = f_maker(attr1, attr2)

c = C(2,3)
print(*(c.f(i) for i in range(5)))

# 3 5 7 9 11

Having f use both initial and 'current' attribute values would be a bit 
trickier ;-)

Terry Jan Reedy



From tjreedy at udel.edu  Fri Feb 20 16:35:47 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 16:35:47 -0500
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
Message-ID: <gnn7nk$hqq$1@ger.gmane.org>

Ron Garret wrote:
> I would have thought that the answer would be: the default encoding 
> (duh!)  But empirically this appears not to be the case:
> 
>>>> unicode('\xb5')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> ordinal not in range(128)

The unicode function is usually used to decode bytes read from *external 
sources*, each of which can have its own encoding.  So the function 
(actually, developer crew) refuses to guess and uses the ascii common 
subset.

>>>> u'\xb5'
> u'\xb5'
>>>> print u'\xb5'
> ?

Unicode literals are *in the source file*, which can only have one 
encoding (for a given source file).

> (That last character shows up as a micron sign despite the fact that my 
> default encoding is ascii, so it seems to me that that unicode string 
> must somehow have picked up a latin-1 encoding.)

I think latin-1 was the default without a coding cookie line.  (May be 
uft-8 in 3.0).



From robert.kern at gmail.com  Fri Feb 20 16:52:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 15:52:02 -0600
Subject: can multi-core improve single funciton?
In-Reply-To: <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>	<mailman.9220.1234269815.3487.python-list@python.org>	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
Message-ID: <gnn8m2$kfm$1@ger.gmane.org>

On 2009-02-20 13:20, Unknown wrote:
> On 2009-02-20, Aahz<aahz at pythoncraft.com>  wrote:
>> Steven D'Aprano<steven at REMOVE.THIS.cybersource.com.au>  wrote:
>>
>>> As I understand it, there's very little benefit to multi-cores
>>> in Python due to the GIL.
>> As phrased, your statement is completely wrong.  Here's a more
>> correct phrasing: "For threaded compute-bound applications
>> written in pure Python, there's very little benefit to
>> multiple cores." But threaded I/O-bound applications do
>> receive some benefit from multiple cores, and using multiple
>> processes certainly leverages multiple cores.  If boosting the
>> performance of a threaded compute-bound application is
>> important, one can always write the critical parts in C/C++.
>
> Do the crunchy bits of scipy/numpy, scientific python, vtk and
> other compute-intensive libraries tend to release the GIL while
> they're busy "computing"?

Often. Not as often as they could, sometimes.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Fri Feb 20 17:09:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 17:09:19 -0500
Subject: cx_oracle -- how to insert "&"
In-Reply-To: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>
References: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>
Message-ID: <gnn9mj$m3o$1@ger.gmane.org>

Allen wrote:
> I am using Python with cx_oracle to load an excel spreadsheet into an
> Oracle table. There are lots of text on the spreadsheet that have "&"
> in them which I want to keep in the table. But inserting those text
> will fail.

Why do you say that?

> Is there a work around for this? I can filter out the
> failed insert statements and in SQLPLUS set define off  to run those
> statements, but it would be nice to insert "&" directly in PYTHON.
> 
regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Fri Feb 20 17:18:13 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 19:18:13 -0300 (CLST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
Message-ID: <ed02bed307df1596d6c516fb3fe9525f.squirrel@localhost>

from subsequent posts i think you were looking for something "smarter"
than my streams, but i was interested in the idea, so i wrote an
implementation.  hope this is ok - if you don't want to see a worked
solution, read no further...

i have been using generators a lot recently; now that i understand them
better i really like the "laziness" they give.  this code is perhaps more
like you would see in haskell than in python...

some results from the code as below:

 -725 = (((1)+(1))+((1)+(1)))-(((1)+(2))^((2)*(3)))  (length 8)
...
   -2 = (1)-(3)               (length 2)
   -1 = (1)-(2)               (length 2)
    0 = (1)-(1)               (length 2)
    1 = 1                     (length 1)
    2 = 2                     (length 1)
    3 = 3                     (length 1)
    4 = (1)+(3)               (length 2)
...
  972 = (((1)+(1))+((1)+(1)))*(((1)+(2))^((2)+(3)))  (length 8)

note that because this is a brute-force search it is limited in the number
of combinations it considers (for a given "take", below), and not at all
"smart" (in preferring pow over other values for example), so the extreme
values are nothing like optimal (the final invocation, commented out, uses
sorting to improve things).

also, complex and float values are generated; i discard those with a
filter, but you can drop that if you are curious.


#!/usr/bin/python3

'''
See
http://groups.google.com/group/comp.lang.python/browse_thread/thread/b387f99deb376392

This is a brute force approach using streams, implemented
with generators.
'''

from operator import add, sub, mul, truediv as div, pow


OPERATORS = [('+', add), ('-', sub), ('*', mul),
             ('/', div), ('^', pow)]
START = [(str(i), 1, i) for i in [1,2,3]]


def all_operators(stream):
    '''
    Generate new values by combining the values in 'stream' in
    all the different ways possible.
    '''
    for (exprn, length, value) in stream:
        for (symbol, op) in OPERATORS:
            for (exprn2, length2, value2) in stream:
                try:
                    yield ('({0}){1}({2})'.format(
                            exprn, symbol, exprn2),
                           length + length2,
                           op(value, value2))
                except Exception as e:
#                    print('Ignoring {}',format(e))
                    pass


def repeat(generator, preproc=lambda x: x):
    '''
    Make a generator 'eat its own tail', primed with 'start'.
    All output is kept and fed back into the generator as input.   Note
that memory use increases steadily.
    '''
    def repeater(start):
        start = preproc(start)
        for value in start:
            yield value
        while True:
            finish = []
            for value in generator(start):
                yield value
                finish.append(value)
            start = finish
    return repeater



def value(elv):
    '''
    Pick the value from an elv triplet.
    '''
    (exprn, length, value) = elv
    return value


def take(n):
    '''
    Build a filter that takes the first n values from a stream.
    '''
    def taker(stream, n=n):
        while n > 0:
            yield next(stream)
            n -= 1
    return taker


def mkfilter(predicate):
    '''
    Curry Python's filter function.
    '''
    def myfilter(stream):
        return filter(lambda elv: predicate(value(elv)), stream)
    return myfilter


def compose(*filters):
    '''
    Compose several filters to give a new filter.
    (Is there a better way to write this?)
    '''
    def composer(iter1, iter2):
        def composed(stream):
            for value in iter1(iter2(stream)):
                yield value
        return composed
    if len(filters) == 1:
        return filters[0]
    else:
        return composer(filters[0], compose(*filters[1:]))


def summarise(stream):
    '''
    Group values by value, keeping the shortest expression,
    then print everything.
    '''
    exprns = {}
    lengths = {}
    for (exprn, length, value) in stream:
        if value not in exprns or length < lengths[value]:
            exprns[value] = exprn
            lengths[value] = length
    values = [value for value in exprns if type(value) is int]
    for value in sorted(values):
        print('{0:>5} = {1:20}  (length {2})'.format(
                value, exprns[value], lengths[value]))


if __name__ == '__main__':
    ints = mkfilter(lambda x: type(x) is int)
    small = mkfilter(lambda x: abs(x) < 1000)
    # this gets very slow after 20000 values
#    summarise(compose(take(20000),
#                      repeat(compose(ints,
#                                     all_operators)))(START))
    # clipping values to below 1000 makes things much faster
    # note 200,000 below, 20,000 above!
    summarise(compose(take(200000),
                      repeat(compose(ints, small,
                                     all_operators)))(START))
    # get to larger values faster by sorting in the repeat
#    sort = lambda x: sorted(x, key=value, reverse=True)
#    summarise(compose(take(200000),
#                      repeat(compose(ints, small,
#                                     all_operators),
#                             preproc=sort))(START))



andrew cooke wrote:
>
> this is a neat problem.
>
> here is what i would do: use generators that extend an input.  a stream
approach.  the initial input would be the numbers themselves.
>
> [('1', 1),('2', 2),('3', 3)]
>
> those are (expression, value) pairs
>
> then an initial attempt at the next function would be to extend that
list
> with additions:
>
> def additions(pairs):
>   for (expr1, value1) in pairs:
>     # first, pass through unchanged
>     yield (expr1, value1)
>     # then generate all possible additions
>     for (expr2, value2) in pairs:
>       yield ('%s+%s'%(value1, value2), value1 + value2))
>
> this would give you:
>
> [('1', 1),('2', 2),('3', 3), ('1+1', 2), ...]
>
> (you may need to add parentheses to expressions to preserve meaning
correctly)
>
> you could extend that with an extra loop over different operations.
(subtraction, multiplication, etc)
>
> then you could repeat that as often as you want (eating its own tail, in
a
> sense, i think).  an infinite list is ok because these are generators.
>
> then you could filter that to group expressions that give a certain
value,
> and find the shortest.
>
> andrew
>
>
>
> Trip Technician wrote:
>> anyone interested in looking at the following problem.
>> we are trying to express numbers as minimal expressions using only the
digits one two and three, with conventional arithmetic. so for
>> instance
>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>> are both minimal, using 4 digits but
>> 33 = ((3+2)*2+1)*3
>> using 5 is not.
>> I have tried coding a function to return the minimal representation for
any integer, but haven't cracked it so far. The naive first attempt is
to generate lots of random strings, eval() them and sort by size and
value. this is inelegant and slow.
>> I have a dim intuition that it could be done with a very clever bit of
recursion, but the exact form so far eludes me.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>






From invalid at invalid  Fri Feb 20 17:27:19 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 20 Feb 2009 16:27:19 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
	<mailman.382.1235166735.11746.python-list@python.org>
Message-ID: <btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>

On 2009-02-20, Robert Kern <robert.kern at gmail.com> wrote:
>
>> Do the crunchy bits of scipy/numpy, scientific python, vtk and
>> other compute-intensive libraries tend to release the GIL
>> while they're busy "computing"?
>
> Often. Not as often as they could, sometimes.

On one hand, the upshot of that is that by finding an
appropriate library module you might gain some of the same
benefits as removing the GIL.

On the other hand, that doesn't help if you're doing something
original enough that nobody has written a library to handle
large chunks of it.

And on the grasping hand, I find that most of us vastly
overestimate the originality of what we're doing.

-- 
Grant Edwards                   grante             Yow! This is a NO-FRILLS
                                  at               flight -- hold th' CANADIAN
                               visi.com            BACON!!


From callen314 at gmail.com  Fri Feb 20 17:34:51 2009
From: callen314 at gmail.com (Craig Allen)
Date: Fri, 20 Feb 2009 14:34:51 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
	<mailman.222.1235010024.11746.python-list@python.org>
Message-ID: <3c42278a-9748-4f12-a876-da5802a55785@e18g2000yqo.googlegroups.com>


> The statement
>
> ? ? x=x+1
>
> (which, by the way, should stylistically be written
>
> ? ? x = x + 1
>

yes I was wondering what "x=x+1" meant until you translated it... oh,
"x = x + 1" of course! I thought to myself.

Oh wait no I'm sarcastic.


From dg.gmane at thesamovar.net  Fri Feb 20 17:37:04 2009
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Fri, 20 Feb 2009 23:37:04 +0100
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <gnnbai$s7v$1@ger.gmane.org>

This sounds kind of similar to a problem I posted to this list last 
year, you might find that thread gives you some ideas:

http://mail.python.org/pipermail/python-list/2008-January/474071.html

Dan



From matthew at woodcraft.me.uk  Fri Feb 20 17:43:13 2009
From: matthew at woodcraft.me.uk (Matthew Woodcraft)
Date: Fri, 20 Feb 2009 22:43:13 GMT
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
Message-ID: <87ab8gu3um.fsf@golux.woodcraft.me.uk>

Ron Garret <rNOSPAMon at flownet.com> writes:
> Put this another way: I would have thought that when the Python parser
> parses "u'\xb5'" it would produce the same result as calling
> unicode('\xb5'), but it doesn't. Instead it seems to produce the same
> result as calling unicode('\xb5', 'latin-1'). But my default encoding
> is not latin-1, it's ascii. So where is the Python parser getting its
> encoding from? Why does parsing "u'\xb5'" not produce the same error
> as calling unicode('\xb5')?

There is no encoding involved other than ascii, only processing of a
backslash escape.

The backslash escape '\xb5' is converted to the unicode character whose
ordinal number is B5h. This gives the same result as
"\xb5".decode("latin-1") because the unicode numbering is the same as
the 'latin-1' numbering in that range.

-M-


From aaron.hildebrandt at gmail.com  Fri Feb 20 17:44:21 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 14:44:21 -0800 (PST)
Subject: Find the location of a loaded module
References: e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com 
	<e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
Message-ID: <5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>

And finally, an epilogue.

So, the problem lies with how Python cached the modules in memory.
Yes, the modules were in two different locations and yes, the one that
I specified using its direct path should be the one loaded. The
problem is, the module isn't always loaded -- if it's already in
memory, it'll use that instead. And since the modules had the same
name, Python wouldn't distinguish between them, even though they
weren't exactly the same. So, loading the module act1/story would load
act1/story. Then, loading the module act2/story would use the story
module already in memory. Of course, this made the problem hard to
pinpoint, since memory is a fickle thing, and the results weren't
always reproducible.

The final solution? Renaming the 'story' modules to 'story_1' and
'story_2'... and importing them via 'exec("from story_"+modulename+"
import game")'.

Will I go to hell for this 'solution'? Probably. But hey, it means I
can go home tonight instead of spending all evening at the office
hitting my head against the wall. I'll come back to it Monday and try
to figure out a more reasonable solution.


From martin at v.loewis.de  Fri Feb 20 18:15:08 2009
From: martin at v.loewis.de (=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 21 Feb 2009 00:15:08 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
Message-ID: <499F397C.7030404@v.loewis.de>

> Yes, I know that.  But every concrete representation of a unicode string 
> has to have an encoding associated with it, including unicode strings 
> produced by the Python parser when it parses the ascii string "u'\xb5'"
> 
> My question is: what is that encoding?

The internal representation is either UTF-16, or UTF-32; which one is
a compile-time choice (i.e. when the Python interpreter is built).

> Put this another way: I would have thought that when the Python parser 
> parses "u'\xb5'" it would produce the same result as calling 
> unicode('\xb5'), but it doesn't.

Right. In the former case, \xb5 denotes a Unicode character, namely
U+00B5, MICRO SIGN. It is the same as u"\u00b5", and still the same
as u"\N{MICRO SIGN}". By "the same", I mean "the very same".

OTOH, unicode('\xb5') is something entirely different. '\xb5' is a
byte string with length 1, with a single byte with the numeric
value 0xb5, or 181. It does not, per se, denote any specific character.
It only gets a character meaning when you try to decode it to unicode,
which you do with unicode('\xb5'). This is short for

  unicode('\xb5', sys.getdefaultencoding())

and sys.getdefaultencoding() is (or should be) "ascii". Now, in
ASCII, byte 0xb5 does not have a meaning (i.e. it does not denote
a character at all), hence you get a UnicodeError.

> Instead it seems to produce the same 
> result as calling unicode('\xb5', 'latin-1').

Sure. However, this is only by coincidence, because latin-1 has the same
code points as Unicode (for 0..255).

> But my default encoding 
> is not latin-1, it's ascii.  So where is the Python parser getting its 
> encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
> calling unicode('\xb5')?

Because \xb5 *directly* refers to character U+00b5, with no
byte-oriented encoding in-between.

Regards,
Martin


From brianlong at cox.net  Fri Feb 20 18:15:31 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Fri, 20 Feb 2009 15:15:31 -0800 (PST)
Subject: count secton of data in list
Message-ID: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>

I have a list of three columns of data.  I run the following code:

def step1(val):
    for d1r in data1_row:
        if d1r[1] >= val:
            switch = 0
            data2_row = d1r[0],d1r[1],d1r[2],switch
            print d1r[0],d1r[1],d1r[2],switch
        else:
            switch = 1
            print d1r[0],d1r[1],d1r[2],switch

step1(95)

After running that code I get four columns with either a '0' or '1' in
the 4th column, as shown below

2009-01-09 13:17:30 96 123456 0
2009-01-09 13:17:31 95 123456 0
2009-01-09 13:17:32 95 123456 0
2009-01-09 13:17:33 95 123456 0
2009-01-09 13:17:34 94 123456 1
2009-01-09 13:17:35 94 123456 1
2009-01-09 13:17:36 94 123456 1
2009-01-09 13:17:37 94 123456 1
2009-01-09 13:17:38 94 123456 1
2009-01-09 13:17:39 94 123456 1
2009-01-09 13:17:40 94 123456 1
2009-01-09 13:17:41 94 123456 1
2009-01-09 13:17:42 95 123456 0
2009-01-09 13:17:43 95 123456 0
2009-01-09 13:17:44 95 123456 0
2009-01-09 13:17:45 95 123456 0

Where I am getting stuck is that I now need to get the individual
counts for the various consecutive areas in the list where the values
are '1'.  I was trying to run a FOR Loop on the variable data2_row....
but that does not work.  Any assistance would be great.

Thanks:
B



From Scott.Daniels at Acm.Org  Fri Feb 20 18:15:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 20 Feb 2009 15:15:42 -0800
Subject: Implementaion of random.shuffle
In-Reply-To: <pan.2007.07.19.03.47.01.146316@REMOVE.THIS.cybersource.com.au>
References: <4e8b75a40707160510h25773f3ch749492cba2dc733@mail.gmail.com>
	<mailman.752.1184590453.22759.python-list@python.org>
	<87d4ys9z46.fsf@mulj.homelinux.net>
	<pan.2007.07.17.02.51.13@REMOVE.THIS.cybersource.com.au>
	<1184787155.773575.303080@d30g2000prg.googlegroups.com>
	<pan.2007.07.19.03.47.01.146316@REMOVE.THIS.cybersource.com.au>
Message-ID: <AK2dnf30VP6QpALUnZ2dnUVZ_oninZ2d@pdx.net>

Steven D'Aprano wrote:
> On Wed, 18 Jul 2007 19:32:35 +0000, George Sakkis wrote:
>...
>> Wow, can you make a coffee in.. 57ms ?
> [snip demonstration of xrange raising an exception]
> Of course! Can't you?
> 
> And if I use a microwave oven, 
     [*** deleted section outlining Guido's time machine structure ***]

Steve, consider yourself warned!!!

-- The PSU


From martin at v.loewis.de  Fri Feb 20 18:19:43 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 00:19:43 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <mailman.381.1235165762.11746.python-list@python.org>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<mailman.381.1235165762.11746.python-list@python.org>
Message-ID: <499F3A8F.9010200@v.loewis.de>


>>>>> u'\xb5'
>> u'\xb5'
>>>>> print u'\xb5'
>> ?
> 
> Unicode literals are *in the source file*, which can only have one
> encoding (for a given source file).
> 
>> (That last character shows up as a micron sign despite the fact that
>> my default encoding is ascii, so it seems to me that that unicode
>> string must somehow have picked up a latin-1 encoding.)
> 
> I think latin-1 was the default without a coding cookie line.  (May be
> uft-8 in 3.0).

It is, but that's irrelevant for the example. In the source

  u'\xb5'

all characters are ASCII (i.e. all of "letter u", "single
quote", "backslash", "letter x", "letter b", "digit 5").
As a consequence, this source text has the same meaning in all
supported source encodings (as source encodings must be ASCII
supersets).

The Unicode literal shown here does not get its interpretation
from Latin-1. Instead, it directly gets its interpretation from
the Unicode coded character set. The string is a short-hand
for

 u'\u00b5'

and this denotes character U+00B5 (just as u'\u20ac" denotes
U+20AC; the same holds for any other u'\uXXXX').

HTH,
Martin


From lionel.keene at gmail.com  Fri Feb 20 18:33:14 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 15:33:14 -0800 (PST)
Subject: "import" not working?
Message-ID: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>

Hello all:

I've crafted several classes and exceptions which I've stored in a
file called "DataFileType.py". I then invoke them from within other
files like this:


# Top of file

import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *

data = None

try:
   # Note: "INTData" is a class defined in "DataFileTypes"
    data = INTData("C:\SomeRawDataFile.int")

except DataFileError:
    print("Error opening data file")

except ResourceFileError:
    print("Error opening resource file")


The above works very well. No complaints. However, I'm experimenting
with the wxPython gui library and found that this no longer seems to
work when I add the crucial bits to one of their examples. I've copied
and run an example that came with wxPython and verified that, with no
modification on my part, it runs with no problem. I then add ONLY my
import instructions and try to instantiate an object as follows (I'm
only showing a portion of the file):


#!/usr/bin/env python

from numpy import arange, sin, pi

import matplotlib

matplotlib.use('WX')
from matplotlib.backends.backend_wx import FigureCanvasWx as
FigureCanvas

from matplotlib.figure import Figure

from wx import *

# The following 4 lines are my additions to the example code:
import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *
data = INTData("C:\SomeRawDataFile.int")


class CanvasFrame(Frame):
.
.
etc
.
.



Running the above program (which I've called "guiplottest.py")
generates an immediate error with the following traceback:

C:\Guiplottest.py
Traceback <most recent call last>:
   File "C:\GuiPlotTest.py", line 19, in <module>
      data = INTData("C:\SomeRawDataFile.int")
NameError: name 'INTData' is not defined


But "INTData" is defined...it's defined in "DataFileTypes" from which
I've imported everything. What's happening here? Thanks in advance!

-L


From emile at fenx.com  Fri Feb 20 18:45:53 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 20 Feb 2009 15:45:53 -0800
Subject: count secton of data in list
In-Reply-To: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
Message-ID: <gnnfbi$7u2$1@ger.gmane.org>

brianrpsgt1 wrote:
> 
> def step1(val):
       data2_row = []

>     for d1r in data1_row:
>         if d1r[1] >= val:
>             switch = 0
>             data2_row = d1r[0],d1r[1],d1r[2],switch
               data2_row.append([d1r[0],d1r[1],d1r[2],switch])


HTH,

Emile



From emile at fenx.com  Fri Feb 20 18:48:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 20 Feb 2009 15:48:54 -0800
Subject: "import" not working?
In-Reply-To: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
Message-ID: <gnnfh6$7u2$2@ger.gmane.org>

Lionel wrote:
> from DataFileTypes import *

That's an import where you don't know what's getting import'd -- ie, 
namespace pollution


[snip]

> from wx import *
> 

and more here.  Try being explicit with your naming.

HTH,

Emile





From clp2 at rebertia.com  Fri Feb 20 18:52:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 15:52:10 -0800
Subject: "import" not working?
In-Reply-To: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>

On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.keene at gmail.com> wrote:
> Hello all:
>
> I've crafted several classes and exceptions which I've stored in a
> file called "DataFileType.py". I then invoke them from within other
> files like this:
>
>
> # Top of file
>
> import sys
> sys.path.append("c:\DataFileTypes")

Recall that the backslash is the escape character in Python and that
therefore you need to put \\ to get a backslash in the resulting path
string. Thus, the path you think you're adding isn't the path that's
getting added.
Alternatively, you can just use forward slashes instead (yes, that
works on Windows from Python).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From lionel.keene at gmail.com  Fri Feb 20 18:56:25 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 15:56:25 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
Message-ID: <7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>

On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > Hello all:
>
> > I've crafted several classes and exceptions which I've stored in a
> > file called "DataFileType.py". I then invoke them from within other
> > files like this:
>
> > # Top of file
>
> > import sys
> > sys.path.append("c:\DataFileTypes")
>
> Recall that the backslash is the escape character in Python and that
> therefore you need to put \\ to get a backslash in the resulting path
> string. Thus, the path you think you're adding isn't the path that's
> getting added.
> Alternatively, you can just use forward slashes instead (yes, that
> works on Windows from Python).
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

But I'm only using a single backslash in the first example I gave, and
it works just fine there. How can this be?


From rNOSPAMon at flownet.com  Fri Feb 20 19:10:15 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 16:10:15 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<mailman.381.1235165762.11746.python-list@python.org>
	<499F3A8F.9010200@v.loewis.de>
Message-ID: <rNOSPAMon-C73D1F.16101520022009@news.gha.chartermi.net>

In article <499F3A8F.9010200 at v.loewis.de>,
 "Martin v. L?wis" <martin at v.loewis.de> wrote:

> >>>>> u'\xb5'
> >> u'\xb5'
> >>>>> print u'\xb5'
> >> ?
> > 
> > Unicode literals are *in the source file*, which can only have one
> > encoding (for a given source file).
> > 
> >> (That last character shows up as a micron sign despite the fact that
> >> my default encoding is ascii, so it seems to me that that unicode
> >> string must somehow have picked up a latin-1 encoding.)
> > 
> > I think latin-1 was the default without a coding cookie line.  (May be
> > uft-8 in 3.0).
> 
> It is, but that's irrelevant for the example. In the source
> 
>   u'\xb5'
> 
> all characters are ASCII (i.e. all of "letter u", "single
> quote", "backslash", "letter x", "letter b", "digit 5").
> As a consequence, this source text has the same meaning in all
> supported source encodings (as source encodings must be ASCII
> supersets).
> 
> The Unicode literal shown here does not get its interpretation
> from Latin-1. Instead, it directly gets its interpretation from
> the Unicode coded character set. The string is a short-hand
> for
> 
>  u'\u00b5'
> 
> and this denotes character U+00B5 (just as u'\u20ac" denotes
> U+20AC; the same holds for any other u'\uXXXX').
> 
> HTH,
> Martin

Ah, that makes sense.  Thanks!

rg


From rNOSPAMon at flownet.com  Fri Feb 20 19:10:51 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 16:10:51 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <rNOSPAMon-F444F1.16105120022009@news.gha.chartermi.net>

In article <499F397C.7030404 at v.loewis.de>,
 "Martin v. L?wis" <martin at v.loewis.de> wrote:

> > Yes, I know that.  But every concrete representation of a unicode string 
> > has to have an encoding associated with it, including unicode strings 
> > produced by the Python parser when it parses the ascii string "u'\xb5'"
> > 
> > My question is: what is that encoding?
> 
> The internal representation is either UTF-16, or UTF-32; which one is
> a compile-time choice (i.e. when the Python interpreter is built).
> 
> > Put this another way: I would have thought that when the Python parser 
> > parses "u'\xb5'" it would produce the same result as calling 
> > unicode('\xb5'), but it doesn't.
> 
> Right. In the former case, \xb5 denotes a Unicode character, namely
> U+00B5, MICRO SIGN. It is the same as u"\u00b5", and still the same
> as u"\N{MICRO SIGN}". By "the same", I mean "the very same".
> 
> OTOH, unicode('\xb5') is something entirely different. '\xb5' is a
> byte string with length 1, with a single byte with the numeric
> value 0xb5, or 181. It does not, per se, denote any specific character.
> It only gets a character meaning when you try to decode it to unicode,
> which you do with unicode('\xb5'). This is short for
> 
>   unicode('\xb5', sys.getdefaultencoding())
> 
> and sys.getdefaultencoding() is (or should be) "ascii". Now, in
> ASCII, byte 0xb5 does not have a meaning (i.e. it does not denote
> a character at all), hence you get a UnicodeError.
> 
> > Instead it seems to produce the same 
> > result as calling unicode('\xb5', 'latin-1').
> 
> Sure. However, this is only by coincidence, because latin-1 has the same
> code points as Unicode (for 0..255).
> 
> > But my default encoding 
> > is not latin-1, it's ascii.  So where is the Python parser getting its 
> > encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
> > calling unicode('\xb5')?
> 
> Because \xb5 *directly* refers to character U+00b5, with no
> byte-oriented encoding in-between.
> 
> Regards,
> Martin

OK, I think I get it now.  Thanks!

rg


From mkhitrov at gmail.com  Fri Feb 20 19:14:57 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 20 Feb 2009 19:14:57 -0500
Subject: Using clock() in threading on Windows
Message-ID: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>

Greetings,

The threading module uses time.time in _Condition and _Thread classes
to implement timeouts. On Windows, time() typically has a resolution
of 15.625ms. In addition, if the system clock is changed (though ntp,
for example) it would reflect that change, causing the timeout to last
longer or shorter depending on which way the update went.

Would it not be better to use time.clock() instead? The resolution is
much better, and the value is not linked to system clock. Right now, I
replace the threading._time reference with clock in some of my
programs and everything works perfectly. Condition and Event timeouts
are precise down to the millisecond (resolution of the sleep
function), and I see no side-effects.

Is it possible to make that change part of the module itself (keeping
time() for linux systems), or can someone think of a reason why using
clock is a bad idea? I know that it's using QueryPerformanceCounter
for implementation, which has some known issues, but I still think
that the advantages outweigh potential faults.

- Max


From mccredie at gmail.com  Fri Feb 20 19:15:59 2009
From: mccredie at gmail.com (Matimus)
Date: Fri, 20 Feb 2009 16:15:59 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
Message-ID: <11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>

On Feb 20, 3:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > > Hello all:
>
> > > I've crafted several classes and exceptions which I've stored in a
> > > file called "DataFileType.py". I then invoke them from within other
> > > files like this:
>
> > > # Top of file
>
> > > import sys
> > > sys.path.append("c:\DataFileTypes")
>
> > Recall that the backslash is the escape character in Python and that
> > therefore you need to put \\ to get a backslash in the resulting path
> > string. Thus, the path you think you're adding isn't the path that's
> > getting added.
> > Alternatively, you can just use forward slashes instead (yes, that
> > works on Windows from Python).
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> But I'm only using a single backslash in the first example I gave, and
> it works just fine there. How can this be?

You must be running the python script from a directory where the file
you are trying to import is already in the path. It never tries to
look in the (bad) path because it found a file with the same name
locally. My guess is that you are running the wx example from another
location, and that is when you run into problems.

Matt


From steve at holdenweb.com  Fri Feb 20 19:32:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 19:32:36 -0500
Subject: "import" not working?
In-Reply-To: <50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>
Message-ID: <gnni3a$eme$1@ger.gmane.org>

Chris Rebert wrote:
> On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.keene at gmail.com> wrote:
>> Hello all:
>>
>> I've crafted several classes and exceptions which I've stored in a
>> file called "DataFileType.py". I then invoke them from within other
>> files like this:
>>
>>
>> # Top of file
>>
>> import sys
>> sys.path.append("c:\DataFileTypes")
> 
> Recall that the backslash is the escape character in Python and that
> therefore you need to put \\ to get a backslash in the resulting path
> string. Thus, the path you think you're adding isn't the path that's
> getting added.
> Alternatively, you can just use forward slashes instead (yes, that
> works on Windows from Python).
> 
In fact "\D" isn't a defined escape character, so this particular usage
does give the right path, though your general point is good.

>>> "\D"
'\\D'
>>> len("\D")
2

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Fri Feb 20 19:40:03 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 16:40:03 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
Message-ID: <65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>

On Feb 20, 4:15?pm, Matimus <mccre... at gmail.com> wrote:
> On Feb 20, 3:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > > On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > > > Hello all:
>
> > > > I've crafted several classes and exceptions which I've stored in a
> > > > file called "DataFileType.py". I then invoke them from within other
> > > > files like this:
>
> > > > # Top of file
>
> > > > import sys
> > > > sys.path.append("c:\DataFileTypes")
>
> > > Recall that the backslash is the escape character in Python and that
> > > therefore you need to put \\ to get a backslash in the resulting path
> > > string. Thus, the path you think you're adding isn't the path that's
> > > getting added.
> > > Alternatively, you can just use forward slashes instead (yes, that
> > > works on Windows from Python).
>
> > > Cheers,
> > > Chris
>
> > > --
> > > Follow the path of the Iguana...http://rebertia.com
>
> > But I'm only using a single backslash in the first example I gave, and
> > it works just fine there. How can this be?
>
> You must be running the python script from a directory where the file
> you are trying to import is already in the path. It never tries to
> look in the (bad) path because it found a file with the same name
> locally. My guess is that you are running the wx example from another
> location, and that is when you run into problems.
>
> Matt- Hide quoted text -
>
> - Show quoted text -

Okay, moving the wx example into the same directory containing the
first example that was working fixed it. This directory only contains
these two modules and nothing else. The old directory which contained
the example that wasn't working did not contain a module with the same
name as the one I was trying to import, so i don't know why this "fix"
worked.


From kevinosky at gmail.com  Fri Feb 20 19:52:43 2009
From: kevinosky at gmail.com (kevin hayes)
Date: Fri, 20 Feb 2009 16:52:43 -0800
Subject: Python won't run
Message-ID: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>

Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
opening and running after I ran a few programs.  I installed python 2.6
hoping this would allow me to open idle and start learning to program.  How
do I get Idle running again?
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From sjmachin at lexicon.net  Fri Feb 20 20:00:45 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 20 Feb 2009 17:00:45 -0800 (PST)
Subject: cx_oracle -- how to insert "&"
References: 1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com
Message-ID: <04fcf9b4-d496-4585-a63e-d76086fd1cc3@t11g2000yqg.googlegroups.com>

On Feb 21, 3:46?am, Allen <ygua... at gmail.com> wrote:
> I am using Python with cx_oracle to load an excel spreadsheet into an
> Oracle table. There are lots of text on the spreadsheet that have "&"
> in them which I want to keep in the table. But inserting those text
> will fail.

"Will fail" (future tense) or have failed (past tense)??

> Is there a work around for this? I can filter out the
> failed insert statements and in SQLPLUS set define off ?to run those
> statements, but it would be nice to insert "&" directly in PYTHON.
>

We don't have crystal balls. More information please:

1. How are you digging the data out of the spreadsheet?

2. What does print repr(text_on_the_spreadsheet) show for the failing
cases?

3. Show us your code for inserting.

4. What is the failure message?

5. What does "set define off" do for you in SQLPLUS?


From clp2 at rebertia.com  Fri Feb 20 20:03:07 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:03:07 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
Message-ID: <50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com> wrote:
> Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
> opening and running after I ran a few programs.  I installed python 2.6
> hoping this would allow me to open idle and start learning to program.  How
> do I get Idle running again?

What error do you get when trying to run it from the command line?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dsdale24 at gmail.com  Fri Feb 20 20:12:01 2009
From: dsdale24 at gmail.com (Darren Dale)
Date: Fri, 20 Feb 2009 17:12:01 -0800 (PST)
Subject: how to assert that method accepts specific types
Message-ID: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>

I would like to assert that a method accepts certain types. I have a
short example that works:

from functools import wraps

def accepts(*types):
    def check_accepts(f):
        @wraps(f)
        def new_f(self, other):
            assert isinstance(other, types), \
                "arg %r does not match %s" % (other, types)
            return f(self, other)
        return new_f
    return check_accepts

class Test(object):

    @accepts(int)
    def check(self, obj):
        print obj

t = Test()
t.check(1)

but now I want Test.check to accept an instance of Test as well. Does
anyone know how this can be accomplished? The following class
definition for Test raises a NameError:

class Test(object):

    @accepts(int, Test)
    def check(self, obj):
        print obj

Thanks,
Darren


From clp2 at rebertia.com  Fri Feb 20 20:20:02 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:20:02 -0800
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902201720v495e62fen590ca3b564866f40@mail.gmail.com>

On Fri, Feb 20, 2009 at 5:12 PM, Darren Dale <dsdale24 at gmail.com> wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:
>
> from functools import wraps
>
> def accepts(*types):
>    def check_accepts(f):
>        @wraps(f)
>        def new_f(self, other):
>            assert isinstance(other, types), \
>                "arg %r does not match %s" % (other, types)
>            return f(self, other)
>        return new_f
>    return check_accepts
>
> class Test(object):
>
>    @accepts(int)
>    def check(self, obj):
>        print obj
>
> t = Test()
> t.check(1)
>
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
>
> class Test(object):
>
>    @accepts(int, Test)
>    def check(self, obj):
>        print obj

You're going to have to either inject it after the class definition
somehow, or give the class name as a string and use eval() or similar.
The class object doesn't exist until the entire class body has
finished executing, so you can't refer to the class within its own
body.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Fri Feb 20 20:28:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:28:19 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
Message-ID: <50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>

How were you running IDLE previously?

- Chris

On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com> wrote:
> how do i do that?
>
> On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> I meant, what happens when you run *IDLE* from the command line?
>>
>> - Chris
>>
>> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> > When I type "python" into terminal I get >>> but I would like to be able
>> > to
>> > open it as I would any application.  Thanks.
>> >
>> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> >>
>> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com>
>> >> wrote:
>> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
>> >> > opening and running after I ran a few programs.  I installed python
>> >> > 2.6
>> >> > hoping this would allow me to open idle and start learning to
>> >> > program.
>> >> >  How
>> >> > do I get Idle running again?
>> >>
>> >> What error do you get when trying to run it from the command line?
>> >>
>> >> Cheers,
>> >> Chris
>> >>
>> >> --
>> >> Follow the path of the Iguana...
>> >> http://rebertia.com


From tjreedy at udel.edu  Fri Feb 20 20:38:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 20:38:39 -0500
Subject: What encoding does u'...' syntax use?
In-Reply-To: <499F3A8F.9010200@v.loewis.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	<mailman.381.1235165762.11746.python-list@python.org>
	<499F3A8F.9010200@v.loewis.de>
Message-ID: <gnnluv$n3r$1@ger.gmane.org>

Martin v. L?wis wrote:
mehow have picked up a latin-1 encoding.)
>> I think latin-1 was the default without a coding cookie line.  (May be
>> uft-8 in 3.0).
> 
> It is, but that's irrelevant for the example. In the source
> 
>   u'\xb5'
> 
> all characters are ASCII (i.e. all of "letter u", "single
> quote", "backslash", "letter x", "letter b", "digit 5").
> As a consequence, this source text has the same meaning in all
> supported source encodings (as source encodings must be ASCII
> supersets).

I think I understand now that the coding cookie only matters if I use an 
editor that actually stores *non-ascii* bytes in the file for the Python 
parser to interpret.



From clp2 at rebertia.com  Fri Feb 20 20:41:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:41:57 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
Message-ID: <50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>

Hmm. How did you install Python/IDLE?
Also, please use Reply-All as others on the list might have helpful ideas.

- Chris

On Fri, Feb 20, 2009 at 5:34 PM, kevin hayes <kevinosky at gmail.com> wrote:
> I was clicking on the application.  then the idle/python icon would bounce
> in my
> dock and then disappear.
> On Fri, Feb 20, 2009 at 5:28 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> How were you running IDLE previously?
>>
>> - Chris
>>
>> On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> > how do i do that?
>> >
>> > On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> >>
>> >> I meant, what happens when you run *IDLE* from the command line?
>> >>
>> >> - Chris
>> >>
>> >> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com>
>> >> wrote:
>> >> > When I type "python" into terminal I get >>> but I would like to be
>> >> > able
>> >> > to
>> >> > open it as I would any application.  Thanks.
>> >> >
>> >> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com>
>> >> > wrote:
>> >> >>
>> >> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com>
>> >> >> wrote:
>> >> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle
>> >> >> > stopped
>> >> >> > opening and running after I ran a few programs.  I installed
>> >> >> > python
>> >> >> > 2.6
>> >> >> > hoping this would allow me to open idle and start learning to
>> >> >> > program.
>> >> >> >  How
>> >> >> > do I get Idle running again?
>> >> >>
>> >> >> What error do you get when trying to run it from the command line?
>> >> >>
>> >> >> Cheers,
>> >> >> Chris
>> >> >>
>> >> >> --
>> >> >> Follow the path of the Iguana...
>> >> >> http://rebertia.com


From dsdale24 at gmail.com  Fri Feb 20 20:43:46 2009
From: dsdale24 at gmail.com (Darren Dale)
Date: Fri, 20 Feb 2009 17:43:46 -0800 (PST)
Subject: how to assert that method accepts specific types
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
	<mailman.393.1235179208.11746.python-list@python.org>
Message-ID: <72d00e6a-cc14-4b59-9f41-a1adbe7e9ca8@x10g2000yqk.googlegroups.com>

On Feb 20, 8:20?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 20, 2009 at 5:12 PM, Darren Dale <dsdal... at gmail.com> wrote:
> > I would like to assert that a method accepts certain types. I have a
> > short example that works:
>
> > from functools import wraps
>
> > def accepts(*types):
> > ? ?def check_accepts(f):
> > ? ? ? ?@wraps(f)
> > ? ? ? ?def new_f(self, other):
> > ? ? ? ? ? ?assert isinstance(other, types), \
> > ? ? ? ? ? ? ? ?"arg %r does not match %s" % (other, types)
> > ? ? ? ? ? ?return f(self, other)
> > ? ? ? ?return new_f
> > ? ?return check_accepts
>
> > class Test(object):
>
> > ? ?@accepts(int)
> > ? ?def check(self, obj):
> > ? ? ? ?print obj
>
> > t = Test()
> > t.check(1)
>
> > but now I want Test.check to accept an instance of Test as well. Does
> > anyone know how this can be accomplished? The following class
> > definition for Test raises a NameError:
>
> > class Test(object):
>
> > ? ?@accepts(int, Test)
> > ? ?def check(self, obj):
> > ? ? ? ?print obj
>
> You're going to have to either inject it after the class definition
> somehow, or give the class name as a string and use eval() or similar.
> The class object doesn't exist until the entire class body has
> finished executing, so you can't refer to the class within its own
> body.

Thats too bad, thanks for clarifying.


From tjreedy at udel.edu  Fri Feb 20 20:48:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 20:48:37 -0500
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <gnnmhl$p1t$1@ger.gmane.org>

Darren Dale wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:
> 
> from functools import wraps
> 
> def accepts(*types):
>     def check_accepts(f):
>         @wraps(f)
>         def new_f(self, other):
>             assert isinstance(other, types), \
>                 "arg %r does not match %s" % (other, types)
>             return f(self, other)
>         return new_f
>     return check_accepts
> 
> class Test(object):
> 
>     @accepts(int)
>     def check(self, obj):
>         print obj
> 
> t = Test()
> t.check(1)
> 
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
> 
> class Test(object):
> 
>     @accepts(int, Test)
>     def check(self, obj):
>         print obj

Because Test does not exist at the time the function is compiled.
Remove '@accepts...' and put Test.check = accepts(int, Test)(Test.check) 
after the class definition and it should work.

tjr



From andrew at acooke.org  Fri Feb 20 20:50:27 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 22:50:27 -0300 (CLST)
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <7c51ecbf8a5d5accbd4184216e51ba97.squirrel@acooke.dyndns.org>

Darren Dale wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:

just in case it's useful - are you aware that pep3107 (which looks like it
should be leet-speak for something) is implemented in python 3? 
http://www.python.org/dev/peps/pep-3107/

andrew



From kevinosky at gmail.com  Fri Feb 20 20:51:37 2009
From: kevinosky at gmail.com (kevin hayes)
Date: Fri, 20 Feb 2009 17:51:37 -0800
Subject: Python won't run
In-Reply-To: <50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
Message-ID: <37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>

I installed it...with the package that came with python 2.6. When I had 2.5
I was using it(idle) successfully, until I ran a few programs that I got off
the web.  Then, Idle wouldn't open (it just bounced in the dock and then
disappeared).  So I tried installing 2.6 and the same thing happened.

On Fri, Feb 20, 2009 at 5:41 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> Hmm. How did you install Python/IDLE?
> Also, please use Reply-All as others on the list might have helpful ideas.
>
> - Chris
>
> On Fri, Feb 20, 2009 at 5:34 PM, kevin hayes <kevinosky at gmail.com> wrote:
> > I was clicking on the application.  then the idle/python icon would
> bounce
> > in my
> > dock and then disappear.
> > On Fri, Feb 20, 2009 at 5:28 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> >>
> >> How were you running IDLE previously?
> >>
> >> - Chris
> >>
> >> On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com>
> wrote:
> >> > how do i do that?
> >> >
> >> > On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com>
> wrote:
> >> >>
> >> >> I meant, what happens when you run *IDLE* from the command line?
> >> >>
> >> >> - Chris
> >> >>
> >> >> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com>
> >> >> wrote:
> >> >> > When I type "python" into terminal I get >>> but I would like to be
> >> >> > able
> >> >> > to
> >> >> > open it as I would any application.  Thanks.
> >> >> >
> >> >> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com>
> >> >> > wrote:
> >> >> >>
> >> >> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com
> >
> >> >> >> wrote:
> >> >> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle
> >> >> >> > stopped
> >> >> >> > opening and running after I ran a few programs.  I installed
> >> >> >> > python
> >> >> >> > 2.6
> >> >> >> > hoping this would allow me to open idle and start learning to
> >> >> >> > program.
> >> >> >> >  How
> >> >> >> > do I get Idle running again?
> >> >> >>
> >> >> >> What error do you get when trying to run it from the command line?
> >> >> >>
> >> >> >> Cheers,
> >> >> >> Chris
> >> >> >>
> >> >> >> --
> >> >> >> Follow the path of the Iguana...
> >> >> >> http://rebertia.com
>
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From lists at cheimes.de  Fri Feb 20 20:56:36 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 21 Feb 2009 02:56:36 +0100
Subject: Using clock() in threading on Windows
In-Reply-To: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>
References: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>
Message-ID: <gnnn0k$pul$1@ger.gmane.org>

Maxim Khitrov wrote:
> The threading module uses time.time in _Condition and _Thread classes
> to implement timeouts. On Windows, time() typically has a resolution
> of 15.625ms. In addition, if the system clock is changed (though ntp,
> for example) it would reflect that change, causing the timeout to last
> longer or shorter depending on which way the update went.
> 
> Would it not be better to use time.clock() instead? The resolution is
> much better, and the value is not linked to system clock. Right now, I
> replace the threading._time reference with clock in some of my
> programs and everything works perfectly. Condition and Event timeouts
> are precise down to the millisecond (resolution of the sleep
> function), and I see no side-effects.
> 
> Is it possible to make that change part of the module itself (keeping
> time() for linux systems), or can someone think of a reason why using
> clock is a bad idea? I know that it's using QueryPerformanceCounter
> for implementation, which has some known issues, but I still think
> that the advantages outweigh potential faults.

Can you make a feature request? Your proposal seems sensible. A trivial
patch should solve the issue:

from time import sleep as _sleep
if _sys.name == "win32":
    from time import clock as _time
else:
    from time import time as _time

However I'm not sure about the implications.

Christian



From evert.rol at gmail.com  Fri Feb 20 21:01:19 2009
From: evert.rol at gmail.com (Evert Rol)
Date: Sat, 21 Feb 2009 03:01:19 +0100
Subject: Framework installation of 2.6 on OS X, with specified prefix
In-Reply-To: <nad-2C4315.12484620022009@news.gmane.org>
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
	<nad-2C4315.12484620022009@news.gmane.org>
Message-ID: <1D24E2A3-0456-49BE-ABD6-E0B706C5EC09@gmail.com>


On 20 Feb 2009, at 21:48 , Ned Deily wrote:

> In article <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F at gmail.com>,
> Evert Rol <evert.rol at gmail.com> wrote:
>> I'm trying to install Python 2.6 from source on Mac OS X.5, in its  
>> own
>> directory using a framework install. That goes fine, up to the point
>> where it wants to install the applications that come with it (eg, the
>> Wish shell): it tries to install things into /Applications, instead  
>> of
>> eg <prefix>/Applications.
>> Here's my configure line (the flags are there just to let it find my
>> own installed readline):
>>
>> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw --
>> enable-shared --enable-framework=/sw/Library/Frameworks --with-
>> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
>>
>>
>> And the last part of the output of 'make install':
>>
>> ../python.exe ./scripts/BuildApplet.py \
>> 		--destroot "" \
>> 		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/
>> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/
>> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/ 
>> Contents/
>> MacOS/Python-32" && echo "-32"`  \
>> 		--output "/sw/Applications/Python 2.6/Build Applet.app" \
>> 		./scripts/BuildApplet.py
>> cd PythonLauncher && make install DESTDIR=
>> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python
>> 2.6"
>> mkdir: /Applications/Python 2.6: Permission denied
>> make[2]: *** [install] Error 1
>> make[1]: *** [install_PythonLauncher] Error 2
>> make: *** [frameworkinstallapps] Error 2
>>
>> Is there an option on the configure line that I need to set, or
>> something in setup.py? Or perhaps hack the Makefile?
>
> FWIW, the OS X build-installer.py script handles this by specifying a
> DESTDIR on the make install steps rather than including a --prefix on
> the configure.   See Mac/BuildScript/build-installer.py.

That worked: make install DESTDIR=/sw .
Not sure if it's the proper way to do it, but it installed fine now.
I did have to change the configure line:

CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --
enable-shared --enable-framework=/Library/Frameworks --with-
readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5

So --prefix has gone, and --enable-framework lost the /sw. Then the  
DESTDIR setting on the make line prepends it as necessary.

I would have hoped an option on the configure line would have taken  
care of this (--exec-prefix doesn't do it, at least), but well, maybe  
next time.

(Actually, checking again, I now also have a /sw/sw/Applications  
directory, next to the /sw/Applications dir. The former contains  
Applet.app; no idea how it ended up there, while IDLE.app and Python  
Launcher.app ended up in /sw/Applications. So, it almost worked; maybe  
there's some double $DESTDIR/$DESTDIR in the Makefile. Good enough for  
my purposes though.)

Thanks!

   Evert



From nad at acm.org  Fri Feb 20 21:28:18 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 20 Feb 2009 18:28:18 -0800
Subject: Python won't run
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
	<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>
Message-ID: <nad-75A7C1.18281820022009@news.gmane.org>

In article 
<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00 at mail.gmail.com>,
 kevin hayes <kevinosky at gmail.com> wrote:
> I installed it...with the package that came with python 2.6. When I had 2.5
> I was using it(idle) successfully, until I ran a few programs that I got off
> the web.  Then, Idle wouldn't open (it just bounced in the dock and then
> disappeared).  So I tried installing 2.6 and the same thing happened.

There may be some clues in the system.log as to why IDLE is not 
launching.  Launch /Applications/Utilities/Console.app and under its 
File menu select Open System Log.  Now try to launch IDLE again by 
double-clicking on its icon and see if any suspicious messages show up 
in the log.  You could also try moving any IDLE preferences files out of 
the way temporarily and see if that helps.  From a Terminal window, type:
    cd $HOME
    mv .idlerc .idlerc-disabled
then try launching IDLE again.

-- 
 Ned Deily,
 nad at acm.org



From odeits at gmail.com  Fri Feb 20 22:14:02 2009
From: odeits at gmail.com (odeits)
Date: Fri, 20 Feb 2009 19:14:02 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
Message-ID: <9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>

On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:
> On Feb 15, 9:56?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Sun, Feb 15, 2009 at 9:17 PM, ?<pyt... at bdurham.com> wrote:
> > > I need to test strings to determine if one of a list of chars is in the
> > > string. A simple example would be to test strings to determine if they have
> > > a vowel (aeiouAEIOU) present.
>
> > > I was hopeful that there was a built-in method that operated similar to
> > > startswith where I could pass a tuple of chars to be tested, but I could not
> > > find such a method.
>
> > > Which of the following techniques is most Pythonic or are there better ways
> > > to perform this type of match?
>
> > > # long and hard coded but short circuits as soon as match found
> > > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> > > -OR-
>
> > > # flexible, but no short circuit on first match
> > > if [ char for char in word if char in 'aeiouAEIOU' ]:
>
> > Just use the fairly new builtin function any() to make it short-circuit:
>
> > if any(char.lower() in 'aeiou' for char in word):
> > ? ? do_whatever()
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> If you want to generalize it you should look at setshttp://docs.python.org/library/sets.html
>
> It seems what you are actually testing for is if the intersection of
> the two sets is not empty where the first set is the characters in
> your word and the second set is the characters in your defined string.

To expand on what I was saying I thought i should provide a code
snippet:

WORD = 'g' * 100
WORD2 = 'g' * 50 + 'U'
VOWELS = 'aeiouAEIOU'
BIGWORD = 'g' * 10000 + 'U'

def set_test(vowels, word):

    vowels = set( iter(vowels))
    letters = set( iter(word) )

    if letters & vowels:
        return True
    else:
        return False

with python 2.5 I got 1.30 usec/pass against the BIGWORD




From odeits at gmail.com  Fri Feb 20 22:20:30 2009
From: odeits at gmail.com (odeits)
Date: Fri, 20 Feb 2009 19:20:30 -0800 (PST)
Subject: Changing the Image on a button
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
	<e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
	<mailman.121.1234885468.11746.python-list@python.org>
Message-ID: <612b19f3-a577-4a92-8be4-cad02af5922a@a39g2000prl.googlegroups.com>

On Feb 17, 7:14?am, John Posner <jjpos... at snet.net> wrote:
> ?>> > Try this change:
> ?>> >
> ?>> > ? from: btn.configure(image = None)
> ?>> > ? ? to: img1.blank()
> ?>> >
> ?>>
> ?>> This does in fact clear the image out, however it isn't causing the
> ?>> text to display... Do i have have to create a new button and swap it
> ?>> out?
>
> I knew you were gonna ask that! :-) I haven't worked in this area before,
> but I
> found this athttp://effbot.org/tkinterbook/button.htm:
>
> ? ? In earlier versions of Tkinter, the image option overrides the text
> option.
> ? ? If you specify both, only the image is displayed. In later versions, you
> can
> ? ? use the compound option to change this behavior. To display text on top
> of
> ? ? an image, set compound to CENTER:
>
> ? ? ?b = Button(master, text="Click me", image=pattern, compound=CENTER)
>
> So here's a reworking, in which the text and image are both toggled by
> pressing the button:
>
> ### button that toggles both text and image
> from Tkinter import *
>
> def pushed():
> ? ? """callback: button push"""
>
> ? ? global toggle
>
> ? ? if toggle:
> ? ? ? ? btn.config(text="", image=img_empty)
> ? ? ? ? toggle = not toggle
> ? ? else:
> ? ? ? ? btn.config(text=msg, image=img_good)
> ? ? ? ? toggle = not toggle
>
> ### main program
> toggle = True
> msg = "hello"
>
> root = Tk()
>
> ### store two versions of an image in global variables:
> # 1. original image
> img_good = PhotoImage(file="bacon.gif")
>
> # 2. blank image, created by copying and erasing
> img_empty = img_good.copy()
> img_empty.blank()
>
> ### create toggle button
> btn = Button(root, compound=CENTER,
> ? ? ? ? ? ? text="hello", font="helvetica 14 bold",
> ? ? ? ? ? ? image=img_good,
> ? ? ? ? ? ? command=pushed)
> btn.pack()
>
> ### go
> root.mainloop()
>
> E-mail message checked by Spyware Doctor (6.0.0.386)
> Database version: 5.11780http://www.pctools.com/en/spyware-doctor-antivirus/

Thank you very much for your help! It is now behaving the way I wanted!


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 23:17:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 02:17:41 -0200
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<mailman.370.1235150534.11746.python-list@python.org>
	<df56c9b4-5d0b-45c8-9e50-52c2e6c181c5@d2g2000pra.googlegroups.com>
Message-ID: <op.upoovrdmx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 16:15:10 -0200, jimzat <jimzat at iname.com> escribi?:

> I am using the thread module and calling thread.start_new_thread
> (...).  If I use t=thread.start_new_thread(...) and later set
> t.terminate, I get "AttributeError: 'int' object has no attribute
> 'terminate'"

Use the threading module instead, that provides a higher level interface.  
If you originally had:

thread.start_new_thread(function, args)

then it becomes:

polling_thread = threading.Thread(target=function, args=args)
...
polling_thread.start()

> What is the proper way to do this?  I don't want to use globals as I
> will have multiple child windows of various classes.

Use an attribute of this Thread instance. Either a simple boolean or a  
Condition/Event object as Christian Heimes suggested.

-- 
Gabriel Genellina



From kwmsmith at gmail.com  Fri Feb 20 23:50:03 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Fri, 20 Feb 2009 22:50:03 -0600
Subject: can multi-core improve single funciton?
In-Reply-To: <btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
	<mailman.382.1235166735.11746.python-list@python.org>
	<btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>
Message-ID: <c266a7930902202050g35e53ca6u39e1abaf355516d7@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:27 PM, Grant Edwards <invalid at invalid> wrote:
> On one hand, the upshot of that is that by finding an
> appropriate library module you might gain some of the same
> benefits as removing the GIL.
>
> On the other hand, that doesn't help if you're doing something
> original enough that nobody has written a library to handle
> large chunks of it.
>
> And on the grasping hand, I find that most of us vastly
> overestimate the originality of what we're doing.

+1 The Mote in God's Eye / The Gripping Hand reference!

Kurt


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 23:52:05 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 02:52:05 -0200
Subject: function factory question: embed current values of object
	attributes
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
Message-ID: <op.upoqg3zix6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 16:49:21 -0200, Alan Isaac <aisaac at american.edu>  
escribi?:

> I have a class `X` where many parameters are set
> at instance initialization.  The parameter values
> of an instance `x` generally remain unchanged,
> but is there way to communicate to a method that
> it depends only on the initial values of these parameters
> (and does not need to worry about any changes)?
>
> The behavior of method `m` depends on these parameter values.
> It turns out `m` gets called a lot, which means
> that the pameter values are accessed over and over
> (self.p0, self.p1, etc).  I would like to
> manufacture a function equivalent to the method
> that simply uses fixed values (the values at the
> time it is manufactured).  I do not care if this
> function is attached to `x` or not.

Not automatically; but you could refactor the method to call an external  
function with arguments:

class X(...):
   ...
   def foo(self):
     c = self.a + self.b
     return c

Rewrite the method as:

   def foo(self):
     return _foo(self.a, self.b)

and define _foo outside the class:

def _foo(a, b):
   c = a + b
   return c

If you want a "frozen" function (that is, a function already set-up with  
the parameters taken from the current values of x.a, x.b) use  
functools.partial:

x = X()
frozen_foo = functools.partial(_foo, a=x.a, b=x.b)
frozen_foo() # equivalent to x.foo() at the time it was defined

But if you call this in a loop, perhaps it's enough to assign x.a, x.b to  
local variables and call _foo with those arguments.

-- 
Gabriel Genellina



From rozzin at geekspace.com  Sat Feb 21 00:20:20 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 00:20:20 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
Message-ID: <87bpswe57v.fsf@slice.rozzin.com>

Jesse Noller <jnoller at gmail.com> writes:
>
> On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> <Graham.Dumpleton at gmail.com> wrote:
> > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > _bootstrap() doing:
> >
> >  os.close(sys.stdin.fileno())
> >
> > rather than:
> >
> >  sys.stdin.close()
> >
> > Technically it is feasible that stdin could have been replaced with
> > something other than a file object, where the replacement doesn't have
> > a fileno() method.
> >
> > In that sort of situation an AttributeError would be raised, which
> > isn't going to be caught as either OSError or ValueError, which is all
> > the code watches out for.
> 
> I don't know why it was implemented that way. File an issue on the
> tracker and assign it to me (jnoller) please.

My guess would be: because it's also possible for sys.stdin to be a
file that's open in read+*write* mode, and for that file to have
pending output buffered (for example, in the case of a socketfile).

There's a general guideline, inherited from C, that one should ensure
that the higher-level close() routine is invoked on a given
file-descriptor in at most *one* process after that descriptor has
passed through a fork(); in the other (probably child) processes, the
lower-level close() routine should be called to avoid a
double-flush--whereby buffered data is flushed out of one process, and
then the *same* buffered data is flushed out of the (other)
child-/parent-process' copy of the file-object.

So, if you call sys.stdin.close() in the child-process in
_bootstrap(), then it could lead to a double-flush corrupting output
somewhere in the application that uses the multiprocessing module.

You can expect similar issues with just about /any/ `file-like objects'
that might have `file-like semantics' of buffering data and flushing
it on close, also--because you end up with multiple copies of the same
object in `pre-flush' state, and each copy tries to flush at some point.

As such, I'd recommend against just using .close(); you might use
something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
`else' clause unconditionally calls sys.stdin.close(), then you still
have double-flush problems if someone's set sys.stdin to a file-like
object with output-buffering.

I guess you could try calling that an `edge-case' and seeing if anyone
screams. It'd be sort-of nice if there was finer granularity in the
file API--maybe if file.close() took a boolean `flush' argument....

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From nagle at animats.com  Sat Feb 21 00:33:38 2009
From: nagle at animats.com (John Nagle)
Date: Fri, 20 Feb 2009 21:33:38 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.9587.1234730192.3487.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
Message-ID: <499f8a8e$0$1588$742ec2ed@news.sonic.net>

Steve Holden wrote:
> John Nagle wrote:
>> Benjamin Kaplan wrote:
>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>
...Re "bytes" not behaving as documented in 2.6:

>>    That's indeed how Python 2.6 works.  But that's not how
>> PEP 3137 says it's supposed to work.
>>
>> Guido:
>>
>>  "I propose the following type names at the Python level:
>>
>>         * bytes is an immutable array of bytes (PyString)
>>         * bytearray is a mutable array of bytes (PyBytes)"
...
>> (Not true in Python 2.6 
>>
>> Is this a bug, a feature, a documentation error, or bad design?
>>
> It's a feature. In fact all that was done to accommodate easier
> migration to 3.x is easily shown in one statement:
> 
>>>> str is bytes
> True
> 
> So that's why bytes works the way it does in 2.6 ... hence my contested
> description of it as an "ugly hack". I am happy to withdraw "ugly", but
> I think "hack" could still be held to apply.

    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?

    The way it works in 2.6 makes it necessary to do "ord" conversions
where they shouldn't be required.

				John Nagle


From Scott.Daniels at Acm.Org  Sat Feb 21 01:05:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 20 Feb 2009 22:05:40 -0800
Subject: Python won't run
In-Reply-To: <mailman.392.1235178193.11746.python-list@python.org>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<mailman.392.1235178193.11746.python-list@python.org>
Message-ID: <m_udnYICY_q_BALUnZ2dnUVZ_giWnZ2d@pdx.net>

Chris Rebert wrote:
> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
>> opening and running after I ran a few programs.  I installed python 2.6
>> hoping this would allow me to open idle and start learning to program.  How
>> do I get Idle running again?
> 
> What error do you get when trying to run it from the command line?
> 
> Cheers,
> Chris
> 
Try from the command line:

     $ python -m idlelib.idle -n

If it works, do a bit and see how that goes.  Then try:

     $ python -m idlelib.idle

In both cases, you _may_ get error messages to the command window that
help diagnose.

--Scott David Daniels
Scott.Daniels at Acm.Org





From rhodri at wildebst.demon.co.uk  Sat Feb 21 01:25:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 21 Feb 2009 06:25:08 -0000
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <op.upour6b5a8ncjz@gnudebst>

On Sat, 21 Feb 2009 01:12:01 -0000, Darren Dale <dsdale24 at gmail.com> wrote:

> I would like to assert that a method accepts certain types. I have a
> short example that works:
>
> from functools import wraps
>
> def accepts(*types):
>     def check_accepts(f):
>         @wraps(f)
>         def new_f(self, other):
>             assert isinstance(other, types), \
>                 "arg %r does not match %s" % (other, types)
>             return f(self, other)
>         return new_f
>     return check_accepts
>
> class Test(object):
>
>     @accepts(int)
>     def check(self, obj):
>         print obj
>
> t = Test()
> t.check(1)
>
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
>
> class Test(object):
>
>     @accepts(int, Test)
>     def check(self, obj):
>         print obj

An icky but relatively clear way to get around this is to gratuitously
subclass Test:

class AcceptableTest(object):
     pass

class Test(AcceptableTest):
     @accepts(int, AcceptableTest)
     def check(self, obj):
         print obj


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sidell at gmail.com  Sat Feb 21 01:55:23 2009
From: sidell at gmail.com (jsidell)
Date: Fri, 20 Feb 2009 22:55:23 -0800 (PST)
Subject: Wanted: Online Python Course for Credit
Message-ID: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>

I'm a high school game development teacher and I have recently
discovered Python to be a great way to introduce computer
programming.  I intend to study Python on my own but I can get
professional development credit at my job for taking a Python course.
So I'm looking for an online class that I can get a certificate,
college credit, or something to that effect.  Any suggestions would be
greatly appreciated


From gagsl-py2 at yahoo.com.ar  Sat Feb 21 02:00:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 05:00:29 -0200
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
Message-ID: <op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott  
<aaron.hildebrandt at gmail.com> escribi?:

> So, the problem lies with how Python cached the modules in memory.
> Yes, the modules were in two different locations and yes, the one that
> I specified using its direct path should be the one loaded. The
> problem is, the module isn't always loaded -- if it's already in
> memory, it'll use that instead. And since the modules had the same
> name, Python wouldn't distinguish between them, even though they
> weren't exactly the same.

Yes, that's how import works. It's barely documented, and you finally  
learned it the hard way...

> So, loading the module act1/story would load
> act1/story. Then, loading the module act2/story would use the story
> module already in memory. Of course, this made the problem hard to
> pinpoint, since memory is a fickle thing, and the results weren't
> always reproducible.
>
> The final solution? Renaming the 'story' modules to 'story_1' and
> 'story_2'... and importing them via 'exec("from story_"+modulename+"
> import game")'.
>
> Will I go to hell for this 'solution'? Probably. But hey, it means I
> can go home tonight instead of spending all evening at the office
> hitting my head against the wall. I'll come back to it Monday and try
> to figure out a more reasonable solution.

Use packages. Make act1 and act2 packages by creating __init__.py files.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sat Feb 21 03:37:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 06:37:22 -0200
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
Message-ID: <op.upo0wkz9x6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.keene at gmail.com>  
escribi?:

> Okay, moving the wx example into the same directory containing the
> first example that was working fixed it. This directory only contains
> these two modules and nothing else. The old directory which contained
> the example that wasn't working did not contain a module with the same
> name as the one I was trying to import, so i don't know why this "fix"
> worked.

Just play safe:

- Don't use "from xxx import *", least from two places at the same time.  
The wx package has a short name on purpose - use "import wx" and then  
wx.Frame, etc.

- Don't play with sys.path if you don't have to; you can put your own  
modules in a place already listed (like Lib\site-packages). Or, use a .pth  
file if you want to add a copmletely separate directory like  
c:\DataFileTypes

-- 
Gabriel Genellina



From alia_khouri at yahoo.com  Sat Feb 21 03:46:08 2009
From: alia_khouri at yahoo.com (Alia Khouri)
Date: Sat, 21 Feb 2009 00:46:08 -0800 (PST)
Subject: python contextmanagers and ruby blocks
Message-ID: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>

As an exercise, I recently translated one of my python scripts (http://
code.activestate.com/recipes/576643/) to haskell (a penultimate
version exists at http://groups.google.com/group/comp.lang.haskell/browse_thread/thread/fb1ebd986b44244e#
in case anyone is interested) with the result that haskell has now
become my second favourite language (after python of course :-)

Just to change mental gears a bit, I'd now like to do the same and
create a ruby version. As I've progressed on the latter, I've been
struck by how pervasive the use of blocks is in ruby. For example:

class Builder
    attr_accessor :name
    def machine &block
        @name = "m1"
        block.call
    end

    def build(x, &block)
        puts x
        block.call
    end
end

builder = Builder.new

builder.machine do
    puts "hello #{builder.name}"
end

builder.build "hello" do
    puts "world"
end

which should print out:
hello m1
hello
world

Now, python's relatively new contextmanagers seem to provide something
similar such that one can write:

from __future__ import with_statement
from contextlib import contextmanager

class Builder:
    @contextmanager
    def machine(self):
        self.name = "m1"
        yield

    @contextmanager
    def build(self, x):
        print x
        yield

builder = Builder()

with builder.machine():
    print 'hello %s' % builder.name

with builder.build("hello"):
    print 'world'

Which brings me to my questions:

1. To what extent are python's contextmanagers similar or equivalent
to ruby's blocks?

2. If there is a gap in power or expressiveness in python's context
managers relative to ruby's blocks, what are possible (syntactic and
non-syntactic) proposals to bridge this gap?

Thank you for your responses.

AK


From gagsl-py2 at yahoo.com.ar  Sat Feb 21 03:47:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 06:47:33 -0200
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>
Message-ID: <op.upo1djgjx6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 01:14:02 -0200, odeits <odeits at gmail.com> escribi?:
> On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:

>> It seems what you are actually testing for is if the intersection of
>> the two sets is not empty where the first set is the characters in
>> your word and the second set is the characters in your defined string.
>
> To expand on what I was saying I thought i should provide a code
> snippet:
>
> WORD = 'g' * 100
> WORD2 = 'g' * 50 + 'U'
> VOWELS = 'aeiouAEIOU'
> BIGWORD = 'g' * 10000 + 'U'
>
> def set_test(vowels, word):
>
>     vowels = set( iter(vowels))
>     letters = set( iter(word) )
>
>     if letters & vowels:
>         return True
>     else:
>         return False
>
> with python 2.5 I got 1.30 usec/pass against the BIGWORD

You could make it slightly faster by removing the iter() call: letters =  
set(word)
And (if vowels are really constant) you could pre-build the vowels set.

-- 
Gabriel Genellina



From aisaac at american.edu  Sat Feb 21 04:07:25 2009
From: aisaac at american.edu (Alan Isaac)
Date: Sat, 21 Feb 2009 09:07:25 GMT
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <mailman.380.1235165226.11746.python-list@python.org>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
	<mailman.380.1235165226.11746.python-list@python.org>
Message-ID: <hvPnl.737$tw4.287@nwrddc01.gnilink.net>

Terry Reedy wrote: 
> You are now describing a function closure.  Here is an example that 
> might help.


It does.
Thanks,
Alan


From aisaac at american.edu  Sat Feb 21 04:15:25 2009
From: aisaac at american.edu (Alan Isaac)
Date: Sat, 21 Feb 2009 09:15:25 GMT
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <mailman.405.1235191954.11746.python-list@python.org>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
	<mailman.405.1235191954.11746.python-list@python.org>
Message-ID: <NCPnl.738$tw4.734@nwrddc01.gnilink.net>

Gabriel Genellina wrote: 
> If you want a "frozen" function (that is, a function already set-up with  
> the parameters taken from the current values of x.a, x.b) use  
> functools.partial:


OK, that's also a nice idea.
Thanks!
Alan


From martin at v.loewis.de  Sat Feb 21 04:15:39 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 10:15:39 +0100
Subject: Using clock() in threading on Windows
In-Reply-To: <mailman.389.1235175307.11746.python-list@python.org>
References: <mailman.389.1235175307.11746.python-list@python.org>
Message-ID: <499fc63c$0$30913$9b622d9e@news.freenet.de>

> Would it not be better to use time.clock() instead? 

If you really want to reconsider this implementation, I think it
would be best to use relative timeouts all the way down to the
system. In the specific case of Windows, WaitForSingleObject
expects a relative number of milliseconds (i.e. a wait duration).
As this is also what the Python script passes (in seconds),
it is best to leave issues of timer resolution to the operating
system (which we have to trust anyway).

As a consequence, the half-busy loops could go away, at least
on systems where lock timeouts can be given to the system.

Regards,
Martin


From intelliminer at gmail.com  Sat Feb 21 04:35:14 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 01:35:14 -0800 (PST)
Subject: Python dictionary size/entry limit?
Message-ID: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>

I wrote a script to process textual data and extract phrases from
them, storing these phrases in a dictionary. It encounters a
MemoryError when there are about 11.18M keys in the dictionary, and
the size is about 1.5GB. I tried multiple times, and the error occurs
everytime at exactly the same place (with the same number of keys in
the dict). I then split the dictionary into two using a simple
algorithm:

if str[0]<='m':
    dict=dict1
else:
    dict=dict2

#use dict...

And it worked fine. The total size of the two dictionaries well
exceeded 2GB yet no MemoryError occured.

I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
the size or number of entries that a single dictionary can possess? By
searching on the web I can't find a clue why this problem occurs.


From tino at wildenhain.de  Sat Feb 21 05:25:28 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sat, 21 Feb 2009 11:25:28 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <499FD698.9040606@wildenhain.de>

intelliminer at gmail.com wrote:
> I wrote a script to process textual data and extract phrases from
> them, storing these phrases in a dictionary. It encounters a
> MemoryError when there are about 11.18M keys in the dictionary, and
> the size is about 1.5GB. I tried multiple times, and the error occurs
> everytime at exactly the same place (with the same number of keys in
> the dict). I then split the dictionary into two using a simple
> algorithm:
> 
> if str[0]<='m':
>     dict=dict1
> else:
>     dict=dict2
> 
> #use dict...
> 
> And it worked fine. The total size of the two dictionaries well
> exceeded 2GB yet no MemoryError occured.
> 
> I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> the size or number of entries that a single dictionary can possess? By
> searching on the web I can't find a clue why this problem occurs.

 From what can be deducted from the headers of your message:
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1;...
you are using windows?
It seems either python or windows memory management somehow prevent
the use of continuous memory areas that large.
We've got such an example somewhere down the list which was similar
(iirc it was a large string in memory) which runned perfectly
with linux. You can try yourself maybe by installing ubuntu
on the same host. (If you feel fit you can even skip the install
and run it off life CD but then you need to fiddle a little to
get swap space on disk)

Regards
Tino



> --
> http://mail.python.org/mailman/listinfo/python-list

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From intelliminer at gmail.com  Sat Feb 21 05:45:39 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 02:45:39 -0800 (PST)
Subject: Python dictionary size/entry limit?
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<mailman.410.1235211943.11746.python-list@python.org>
Message-ID: <0823e6c0-ed69-4dfe-85aa-286631b9bbee@i15g2000pro.googlegroups.com>

On Feb 21, 6:25?pm, Tino Wildenhain <t... at wildenhain.de> wrote:
> intellimi... at gmail.com wrote:
> > I wrote a script to process textual data and extract phrases from
> > them, storing these phrases in a dictionary. It encounters a
> > MemoryError when there are about 11.18M keys in the dictionary, and
> > the size is about 1.5GB. I tried multiple times, and the error occurs
> > everytime at exactly the same place (with the same number of keys in
> > the dict). I then split the dictionary into two using a simple
> > algorithm:
>
> > if str[0]<='m':
> > ? ? dict=dict1
> > else:
> > ? ? dict=dict2
>
> > #use dict...
>
> > And it worked fine. The total size of the two dictionaries well
> > exceeded 2GB yet no MemoryError occured.
>
> > I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> > the size or number of entries that a single dictionary can possess? By
> > searching on the web I can't find a clue why this problem occurs.
>
> ?From what can be deducted from the headers of your message:
> X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1;...
> you are using windows?
> It seems either python or windows memory management somehow prevent
> the use of continuous memory areas that large.
> We've got such an example somewhere down the list which was similar
> (iirc it was a large string in memory) which runned perfectly
> with linux. You can try yourself maybe by installing ubuntu
> on the same host. (If you feel fit you can even skip the install
> and run it off life CD but then you need to fiddle a little to
> get swap space on disk)
>
> Regards
> Tino
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>
>
> ?smime.p7s
> 4KViewDownload

Yes, it's winxp, I forgot to mention it.
Thanks for the reply.


From stefan_ml at behnel.de  Sat Feb 21 05:47:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 11:47:10 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>

intelliminer at gmail.com wrote:
> I wrote a script to process textual data and extract phrases from
> them, storing these phrases in a dictionary. It encounters a
> MemoryError when there are about 11.18M keys in the dictionary, and
> the size is about 1.5GB.
> [...]
> I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> the size or number of entries that a single dictionary can possess? By
> searching on the web I can't find a clue why this problem occurs.

Python dicts are only limited by what your OS returns as free memory.
However, when a dict grows, it needs to resize, which means that it has to
create a bigger copy of itself and redistribute the keys. For a dict that
is already 1.5GB big, this can temporarily eat a lot more memory than you
have, at least more than two times as much as the size of the dict itself.

You may be better served with one of the dbm databases that come with
Python. They live on-disk but do the usual in-memory caching. They'll
likely perform a lot better than your OS level swap file.

Stefan


From bockman at virgilio.it  Sat Feb 21 06:00:56 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Sat, 21 Feb 2009 12:00:56 +0100
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.21.11.00.48.261043@virgilio.it>

On Sat, 21 Feb 2009 00:46:08 -0800, Alia Khouri wrote:

> As an exercise, I recently translated one of my python scripts (http://
> code.activestate.com/recipes/576643/) to haskell (a penultimate
> version exists at http://groups.google.com/group/comp.lang.haskell/browse_thread/thread/fb1ebd986b44244e#
> in case anyone is interested) with the result that haskell has now
> become my second favourite language (after python of course :-)
> 
> Just to change mental gears a bit, I'd now like to do the same and
> create a ruby version. As I've progressed on the latter, I've been
> struck by how pervasive the use of blocks is in ruby. For example:
>

... ruby code that shows the most twisted 'Hellow world' example I have
ever seen :-) ...

 
> 
> Now, python's relatively new contextmanagers seem to provide something
> similar such that one can write:
> 

... python code doing the same thing - apparently - 
of prevous ruby code, using context managers in a way that I believe the
authors of contextlib module never thought of.


> 
> Which brings me to my questions:
> 
> 1. To what extent are python's contextmanagers similar or equivalent
> to ruby's blocks?
> 

ASAIK, context managers are nothing like ruby blocks.
Context managers have a very specific purpose : to make people able to
abstract the code that one writes to 'enter a context'
(i.e. open a file, start a transaction, ... ) and 'leave a context'
(i.e. close a file, commit or rollback the transaction ... ).
So that you can separate context handling code from the code that performs
actions insed that context, factoring out the first for reuse and better
code maintenance.

Ruby blocks are blocks of code which can be passed as
objects for a number of different usage - for instance to make context
management stuff. If I have to compare them to something in Python, I
would say they are 'lambda on steroids' or 'nameless functions'. And -
personally - I don't like them just as I don't like lambdas in python for
anything but one-liners and I don't like anonymous functions in haskell
(which I am painfully trying to learn ). They may be cool to write, but
they look not very readable to me - but maybe this is just me.

Ciao
----
FB  


 


Ruby blocks - for the little I know of ruby - are anonymous block of
codes


> 2. If there is a gap in power or expressiveness in python's context
> managers relative to ruby's blocks, what are possible (syntactic and
> non-syntactic) proposals to bridge this gap?
> 
> Thank you for your responses.
> 
> AK



From alia_khouri at yahoo.com  Sat Feb 21 08:20:51 2009
From: alia_khouri at yahoo.com (Alia K)
Date: Sat, 21 Feb 2009 05:20:51 -0800 (PST)
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
Message-ID: <aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>

Francesco wrote:

> ... ruby code that shows the most twisted 'Hellow world' example I have
> ever seen :-) ...

and I was gunning for the simplest possible example (-:


> ... python code doing the same thing - apparently -
> of prevous ruby code, using context managers in a way that I believe the
> authors of contextlib module never thought of.

Methinks they probably thought of such usage.

> > 1. To what extent are python's contextmanagers similar or equivalent
> > to ruby's blocks?

> ASAIK, context managers are nothing like ruby blocks.
> Context managers have a very specific purpose : to make people able to
> abstract the code that one writes to 'enter a context'
> (i.e. open a file, start a transaction, ... ) and 'leave a context'
> (i.e. close a file, commit or rollback the transaction ... ).
> So that you can separate context handling code from the code that performs
> actions insed that context, factoring out the first for reuse and better
> code maintenance.

Thinking about it: I suppose one could say in python a contextmanager
defines the functional context of a block of code and makes it a first
class construct in the language, whereas in ruby the block itself is a
first class citizen -- contextmanagers are like the inverse of blocks.

> Ruby blocks are blocks of code which can be passed as
> objects for a number of different usage - for instance to make context
> management stuff. If I have to compare them to something in Python, I
> would say they are 'lambda on steroids' or 'nameless functions'.

Agreed, but also they are more tightly integrated e.g. the &block
construct which can be passed into functions...

> personally - I don't like them just as I don't like lambdas in python for
> anything but one-liners and I don't like anonymous functions in haskell
> (which I am painfully trying to learn ). They may be cool to write, but
> they look not very readable to me - but maybe this is just me.

In case you are learning haskell, here are some excellent guides
(order is important) :

* Learn you a haskell: http://learnyouahaskell.com/chapters
* Real World Haskell: http://book.realworldhaskell.org/
* Typeclassopedia: http://byorgey.wordpress.com/2009/02/16/the-typeclassopedia-request-for-feedback/

(I'm personally still scratching the surface of it all...)

back to the subject...

I suppose because contextmanagers (indeed decorators) are so
relatively new to python, it will probably take a little while for
these constructs to comprehensively penetrate the stdlib. It's already
happened with files, locks, and db transactions but I'm sure there are
many instances where one could benefit from using the with statement.

Nevertheless, I remain curious about whether once can use the
contextmanager in python to achieve the full power of ruby's blocks...

Best,

AK



From mailinglists at vanwingerde.net  Sat Feb 21 08:35:05 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 14:35:05 +0100
Subject: TypeError: descriptor 'replace' requires a 'str' object but received
	a 'unicode'
Message-ID: <49A00309.5030505@vanwingerde.net>

# -*- coding: utf_8 -*-
Omschrijving = u'priv? assuranti?n' # string from a bank.csv
Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
print Omschrijving

When I run this script I get the following message.

"Traceback (most recent call last):
   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
TypeError: descriptor 'replace' requires a 'str' object but received a 
'unicode'"

How can I solve this?




-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net
web: http://jaap.vanwingerde.net/


From stefan_ml at behnel.de  Sat Feb 21 08:55:54 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 14:55:54 +0100
Subject: TypeError: descriptor 'replace' requires a 'str' object but
	received a 'unicode'
In-Reply-To: <mailman.412.1235223310.11746.python-list@python.org>
References: <mailman.412.1235223310.11746.python-list@python.org>
Message-ID: <49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>

Jaap van Wingerde wrote:
> # -*- coding: utf_8 -*-
> Omschrijving = u'priv? assuranti?n' # string from a bank.csv
> Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
> print Omschrijving
> 
> When I run this script I get the following message.
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
>     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> TypeError: descriptor 'replace' requires a 'str' object but received a
> 'unicode'"
> 
> How can I solve this?

By using unicode.replace() instead of str.replace(), i.e.

	Omschrijving = Omschrijving.replace("priv?", 'priv?')

Stefan


From mailinglists at vanwingerde.net  Sat Feb 21 09:43:37 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 15:43:37 +0100
Subject: ordinal not in range
In-Reply-To: <49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
References: <mailman.412.1235223310.11746.python-list@python.org>
	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49A01319.306@vanwingerde.net>

Stefan Behnel wrote:
> 	Omschrijving = Omschrijving.replace("priv?", 'priv?')

I Thank you, this works now, but I get a new error message.

....
import codecs
file = "postbank.csv"
output = "%s.eb" % file
outfile = codecs.open(output, "w", "utf_8")
Omschrijving = u'priv? assuranti?n' # string from postbank.csv
Omschrijving = Omschrijving.replace("priv?", 'priv?')
Omschrijving = Omschrijving.replace("Assuranti?n", 'Assuranti?n')
outfile.write (Omschrijving)

"Traceback (most recent call last):
   File "/home/jaap/Desktop/unicode.py", line 9, in <module>
     outfile.write (Omschrijving)
   File "/usr/lib/python2.5/codecs.py", line 638, in write
     return self.writer.write(data)
   File "/usr/lib/python2.5/codecs.py", line 303, in write
     data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4: 
ordinal not in range(128)"







From aahz at pythoncraft.com  Sat Feb 21 09:59:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 06:59:48 -0800
Subject: Uploading big files wit cherrypy
References: <366595b2-226c-48e4-961d-85bd0ce4bd9a@h16g2000yqj.googlegroups.com>
Message-ID: <gnp4t4$86h$1@panix3.panix.com>

In article <366595b2-226c-48e4-961d-85bd0ce4bd9a at h16g2000yqj.googlegroups.com>,
Farsheed Ashouri  <rodmena.com at gmail.com> wrote:
>
>But I couldn't upload files bigger than 100Mb.  Why and what is
>workaround?

What happens when you upload a file larger than 100MB?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From stefan_ml at behnel.de  Sat Feb 21 10:00:41 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 16:00:41 +0100
Subject: ordinal not in range
In-Reply-To: <mailman.413.1235227420.11746.python-list@python.org>
References: <mailman.412.1235223310.11746.python-list@python.org>	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
	<mailman.413.1235227420.11746.python-list@python.org>
Message-ID: <49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>

Jaap van Wingerde wrote:
> Stefan Behnel wrote:
>>     Omschrijving = Omschrijving.replace("priv?", 'priv?')

actually, make that

	Omschrijving = Omschrijving.replace(u"priv?", u'priv?')

(mind the u"...")


> ....
> import codecs
> file = "postbank.csv"
> output = "%s.eb" % file
> outfile = codecs.open(output, "w", "utf_8")
> Omschrijving = u'priv? assuranti?n' # string from postbank.csv
> Omschrijving = Omschrijving.replace("priv?", 'priv?')
> Omschrijving = Omschrijving.replace("Assuranti?n", 'Assuranti?n')

I guess you mixed up the case here.


> outfile.write (Omschrijving)
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 9, in <module>
>     outfile.write (Omschrijving)
>   File "/usr/lib/python2.5/codecs.py", line 638, in write
>     return self.writer.write(data)
>   File "/usr/lib/python2.5/codecs.py", line 303, in write
>     data, consumed = self.encode(object, self.errors)
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4:
> ordinal not in range(128)"

Does this help?

	outfile = codecs.open(output, "wb", encoding="UTF-8")

(mind the "wb" for 'write binary/bytes')

Looks like you'd be happier with Python 3.0, BTW...

Stefan


From wnewbery at hotmail.co.uk  Sat Feb 21 10:01:16 2009
From: wnewbery at hotmail.co.uk (William Newbery)
Date: Sat, 21 Feb 2009 15:01:16 +0000
Subject: Python C-API Object Allocation
Message-ID: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>


Ive been learning the C-API lately so I can write python extensions for some of my c++ stuff.

I want to use the new and delete operators for creating and destroying my objects.

The problem is python seems to break it into several stages. tp_new, tp_init and tp_alloc for creation and tp_del, tp_free and tp_dealloc for destruction. However c++ just has new which allocates and fully constructs the object and delete which destructs and deallocates the object.


Which of the python tp_* methods do I need to provide and what must they do to be compatible with python subclassing.

Also I want to be able to create the object directly in c++ eg "PyObject *obj = new MyExtensionObject(args);"



_________________________________________________________________
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From steve at holdenweb.com  Sat Feb 21 10:01:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 10:01:30 -0500
Subject: "Byte" type?
In-Reply-To: <499f8a8e$0$1588$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
Message-ID: <gnp50i$up5$1@ger.gmane.org>

John Nagle wrote:
> Steve Holden wrote:
>> John Nagle wrote:
>>> Benjamin Kaplan wrote:
>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>>
> ...Re "bytes" not behaving as documented in 2.6:
> 
>>>    That's indeed how Python 2.6 works.  But that's not how
>>> PEP 3137 says it's supposed to work.
>>>
>>> Guido:
>>>
>>>  "I propose the following type names at the Python level:
>>>
>>>         * bytes is an immutable array of bytes (PyString)
>>>         * bytearray is a mutable array of bytes (PyBytes)"
> ...
>>> (Not true in Python 2.6
>>> Is this a bug, a feature, a documentation error, or bad design?
>>>
>> It's a feature. In fact all that was done to accommodate easier
>> migration to 3.x is easily shown in one statement:
>>
>>>>> str is bytes
>> True
>>
>> So that's why bytes works the way it does in 2.6 ... hence my contested
>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>> I think "hack" could still be held to apply.
> 
>    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
> 
>    The way it works in 2.6 makes it necessary to do "ord" conversions
> where they shouldn't be required.
> 
Yes, the hack was to achieve a modicum of compatibility with 3.0 without
having to turn the world upside down.

I haven't used 3.0 enough the say whether bytearray has been correctly
implemented. But I believe the intention is that 3.0 should fully
implement PEP 3137.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From aahz at pythoncraft.com  Sat Feb 21 10:01:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 07:01:38 -0800
Subject: Change in cgi handling of POST requests
References: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>
Message-ID: <gnp50i$i24$1@panix3.panix.com>

[posted & e-mailed]

In article <e230c5e2-1d7c-4258-8cc0-d78da6304e4e at 13g2000yql.googlegroups.com>,
Mac  <bob.uuca at gmail.com> wrote:
>
>We just upgraded Python to 2.6 on some of our servers and a number of
>our CGI scripts broke because the cgi module has changed the way it
>handles POST requests.  When the 'action' attribute was not present in
>the form element on an HTML page the module behaved as if the value of
>the attribute was the URL which brought the user to the page with the
>form, but without the query (?x=y...) part.  Now FieldStorage.getvalue
>() is giving the script a list of two copies of the value for some of
>the parameters (folding in the parameters from the previous request)
>instead of the single string it used to return for each.  I searched
>this newsgroup looking for a discussion of the proposal to impose this
>change of behavior, and perhaps I wasn't using the right phrases in my
>search, but I didn't find anything.  

Interesting.  Nobody has responded, so I suggest first filing a report
using bugs.python.org and then asking on python-dev (with reference to
your report).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From steve at holdenweb.com  Sat Feb 21 10:27:54 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 10:27:54 -0500
Subject: TypeError: descriptor 'replace' requires a 'str' object but
	received a 'unicode'
In-Reply-To: <49A00309.5030505@vanwingerde.net>
References: <49A00309.5030505@vanwingerde.net>
Message-ID: <gnp6i2$4bo$1@ger.gmane.org>

Jaap van Wingerde wrote:
> # -*- coding: utf_8 -*-
> Omschrijving = u'priv? assuranti?n' # string from a bank.csv
> Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
> print Omschrijving
> 
> When I run this script I get the following message.
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
>     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> TypeError: descriptor 'replace' requires a 'str' object but received a
> 'unicode'"
> 
> How can I solve this?
> 

First of all, use the methods of the unicode type, not the str type.
Secondly, call the methods on an instance, not on the type (the instance
is passed automatically). Thirdly, use Unicode arguments to replace.

Omschrijving = u'priv? assuranti?n' # string from a bank.csv
Omschrijving = Omschrijving.replace(u"priv?", u'priv?')
Omschrijving = Omschrijving.replace(u"assuranti?n", u'assuranti?n')
print Omschrijving

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mailinglists at vanwingerde.net  Sat Feb 21 11:16:58 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 17:16:58 +0100
Subject: ordinal not in range
In-Reply-To: <49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>
References: <mailman.412.1235223310.11746.python-list@python.org>	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>	<mailman.413.1235227420.11746.python-list@python.org>
	<49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49A028FA.90901@vanwingerde.net>

Stefan Behnel wrote:
> 	Omschrijving = Omschrijving.replace(u"priv?", u'priv?')
> (mind the u"...")
> 	outfile = codecs.open(output, "wb", encoding="UTF-8")
> (mind the "wb" for 'write binary/bytes')
It works now!

> Looks like you'd be happier with Python 3.0, BTW...
Python 3 is not in Debian Lenny.

With your help I made my first Python-script. This script saves me from
hours dumb work.

Thanks a lot!!




-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net




From Scott.Daniels at Acm.Org  Sat Feb 21 11:49:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 21 Feb 2009 08:49:09 -0800
Subject: how to assert that method accepts specific types
In-Reply-To: <mailman.406.1235197516.11746.python-list@python.org>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
	<mailman.406.1235197516.11746.python-list@python.org>
Message-ID: <QbSdnaSE-qpusj3UnZ2dnUVZ_rbinZ2d@pdx.net>

Rhodri James wrote:
> On Sat, 21 Feb 2009 01:12:01 -0000, Darren Dale <dsdale24 at gmail.com> wrote:
>> I would like to assert that a method accepts certain types....
>>     from functools import wraps
>>     def accepts(*types):
>>         def check_accepts(f): ...
>>     class Test(object):
>>         @accepts(int)
>>         def check(self, obj):
>>             print obj
>> but now I want Test.check to accept an instance of Test as well....
> 
> An icky but relatively clear way to get around this is to gratuitously
> subclass Test:
> class AcceptableTest(object):
>     pass
> 
> class Test(AcceptableTest):
>     @accepts(int, AcceptableTest)
>     def check(self, obj):
>         print obj

To Increase the ick, but lowering the name pollution
(while making the _source_ read more clearly):

     class Test(<Test base classes>):
         pass # Just a placeholder for type checking

     class Test(Test):
         @accepts(int, Test)
         def check(self, obj):
             print obj


--Scott David Daniels
Scott.Daniels at Acm.Org


From rdmurray at bitdance.com  Sat Feb 21 11:51:40 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 21 Feb 2009 16:51:40 +0000 (UTC)
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnpbes$ics$1@ger.gmane.org>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
> <aaron.hildebrandt at gmail.com> escribi=F3:
> 
> > So, the problem lies with how Python cached the modules in memory.
> > Yes, the modules were in two different locations and yes, the one that
> > I specified using its direct path should be the one loaded. The
> > problem is, the module isn't always loaded -- if it's already in
> > memory, it'll use that instead. And since the modules had the same
> > name, Python wouldn't distinguish between them, even though they
> > weren't exactly the same.
> 
> Yes, that's how import works. It's barely documented, and you finally
> learned it the hard way...

I'd argue a little bit with "barely documented".  In the reference, the
discussion of the import statement starts off saying:

    Import statements are executed in two steps: (1) find a module,
    and initialize it if necessary; (2) define a name or names in the
    local namespace (of the scope where the import statement occurs).

The third paragraph then says:

    The system maintains a table of modules that have been or are being
    initialized, indexed by module name. This table is accessible as
    sys.modules. When a module name is found in this table, step (1)
    is finished.

That is pretty up front and unambiguous documentation.

However, the consequences of that statement won't be immediately clear
on first reading.  I think it would have cleared up Aaron's confusion
if he'd happened to think to read it.  But since he knew the syntax
of the import statement already, I'm not surprised he did not read it.

The Tutorial, in the section on modules and import, says:

    A module can contain executable statements as well as function
    definitions. These statements are intended to initialize the
    module. They are executed only the first time the module is imported
    somewhere.

This is considerably less precise, if more superficially understandable.
I wonder if it would be worth expanding on that statement to mention
that the module is not even looked for on disk if a module by that
name has already been imported.

--RDM



From Scott.Daniels at Acm.Org  Sat Feb 21 12:07:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 21 Feb 2009 09:07:42 -0800
Subject: Wanted: Online Python Course for Credit
In-Reply-To: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
References: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
Message-ID: <HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>

jsidell wrote:
> I'm a high school game development teacher and I have recently
> discovered Python to be a great way to introduce computer
> programming.  I intend to study Python on my own but I can get
> professional development credit at my job for taking a Python course.
> So I'm looking for an online class that I can get a certificate,
> college credit, or something to that effect.  Any suggestions would be
> greatly appreciated

I'd strongly suggest going to PyCon, (sign up for tutorials as well):
     http://us.pycon.org/2009/about/
I know, you want on-line, but the chance to meet with a group of others,
and this PyCon will likely have the best collection of teachers and
Python.

for example, There is a tutorial:
     Python for Teachers (Urner/Holden)

Also two strongly relevant sections in the scheduled talks:
8.  Learning and Teaching Python Programming: The Crunchy Way
     Dr. Andr? Roberge
88.  Seven ways to use Python's new turtle module
     Mr. Gregor Lingl

But make no mistake, you need to mingle when you are there to get the
inspiration you'll want.

--Scott David Daniels
Scott.Daniels at Acm.Org


From nagle at animats.com  Sat Feb 21 12:21:41 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 21 Feb 2009 09:21:41 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.414.1235228520.11746.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
Message-ID: <49a03081$0$1599$742ec2ed@news.sonic.net>

Steve Holden wrote:
> John Nagle wrote:
>> Steve Holden wrote:
>>> John Nagle wrote:
>>>> Benjamin Kaplan wrote:
>>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>>>
>> ...Re "bytes" not behaving as documented in 2.6:
>>
>>>>    That's indeed how Python 2.6 works.  But that's not how
>>>> PEP 3137 says it's supposed to work.
>>>>
>>>> Guido:
>>>>
>>>>  "I propose the following type names at the Python level:
>>>>
>>>>         * bytes is an immutable array of bytes (PyString)
>>>>         * bytearray is a mutable array of bytes (PyBytes)"
>> ...
>>>> (Not true in Python 2.6
>>>> Is this a bug, a feature, a documentation error, or bad design?
>>>>
>>> It's a feature. In fact all that was done to accommodate easier
>>> migration to 3.x is easily shown in one statement:
>>>
>>>>>> str is bytes
>>> True
>>>
>>> So that's why bytes works the way it does in 2.6 ... hence my contested
>>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>>> I think "hack" could still be held to apply.
>>    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
>> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
>>
>>    The way it works in 2.6 makes it necessary to do "ord" conversions
>> where they shouldn't be required.
>>
> Yes, the hack was to achieve a modicum of compatibility with 3.0 without
> having to turn the world upside down.
> 
> I haven't used 3.0 enough the say whether bytearray has been correctly
> implemented. But I believe the intention is that 3.0 should fully
> implement PEP 3137.

    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was really
dumb.  There's no old code using "bytes".  So converting code to 2.6 means
it has to be converted AGAIN for 3.0.  That's a good reason to ignore 2.6 as
defective.

					John Nagle


From rridge at csclub.uwaterloo.ca  Sat Feb 21 12:22:36 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 12:22:36 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
Message-ID: <gnpd8s$pm9$1@rumours.uwaterloo.ca>

=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=  <martin at v.loewis.de> wrote:
>I don't think that was the complaint. Instead, the complaint was
>that the OP's original message did not have a Content-type header,
>and that it was thus impossible to tell what the byte in front of
>"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
>MU in a usenet or email message, you really must use MIME. (As both
>your article and Thorsten's did, by choosing UTF-8)

MIME only applies Internet e-mail messages.  RFC 1036 doesn't require
nor give a meaning to a Content-Type header in a Usenet message, so
there's nothing wrong with the original poster's newsreader.

In any case what the original poster really should do is come up with
a better name for his program

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From aahz at pythoncraft.com  Sat Feb 21 12:42:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:42:02 -0800
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
Message-ID: <gnpeda$4tp$1@panix3.panix.com>

In article <aac004f8-2077-4e53-a865-47c24f7f523a at t3g2000yqa.googlegroups.com>,
Alia K  <alia_khouri at yahoo.com> wrote:
>
>Nevertheless, I remain curious about whether once can use the
>contextmanager in python to achieve the full power of ruby's blocks...

Short answer: no

Longer answer: the way in Python to achieve the full power of Ruby
blocks is to write a function.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From lists at cheimes.de  Sat Feb 21 12:42:27 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 21 Feb 2009 18:42:27 +0100
Subject: "Byte" type?
In-Reply-To: <49a03081$0$1599$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net>
Message-ID: <gnpee3$r69$1@ger.gmane.org>

John Nagle wrote
>    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> really
> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> it has to be converted AGAIN for 3.0.  That's a good reason to ignore
> 2.6 as
> defective.

Please don't call something dumb that you don't fully understand. It's
offenses the people who have spent lots of time developing Python --
personal, unpaid and voluntary time!
I can assure, the bytes alias and b'' alias have their right to exist.

Christian



From aahz at pythoncraft.com  Sat Feb 21 12:45:25 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:45:25 -0800
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
Message-ID: <gnpejl$lq3$1@panix3.panix.com>

In article <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d at posted.visi>,
Grant Edwards  <invalid at invalid> wrote:
>On 2009-02-20, Aahz <aahz at pythoncraft.com> wrote:
>> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>>
>>> As I understand it, there's very little benefit to multi-cores in
>>> Python due to the GIL.
>>
>> As phrased, your statement is completely wrong.  Here's a more
>> correct phrasing: "For threaded compute-bound applications written
>> in pure Python, there's very little benefit to multiple cores." But
>> threaded I/O-bound applications do receive some benefit from multiple
>> cores, and using multiple processes certainly leverages multiple
>> cores.  If boosting the performance of a threaded compute-bound
>> application is important, one can always write the critical parts in
>> C/C++.
>
>Do the crunchy bits of scipy/numpy, scientific python, vtk and other
>compute-intensive libraries tend to release the GIL while they're busy
>"computing"?
>
>[Perhaps using them doesn't count as "pure Python", but...]

They definitely do not count as pure Python -- but I probably should have
mentioned that there are pre-existing libraries that can be used.  It's
just that I/O is about the only area where there is a concerted effort to
ensure that GIL gets released.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From aahz at pythoncraft.com  Sat Feb 21 12:48:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:48:21 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <gnpep5$194$1@panix3.panix.com>

In article <499F397C.7030404 at v.loewis.de>,
=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=  <martin at v.loewis.de> wrote:
>> Yes, I know that.  But every concrete representation of a unicode string 
>> has to have an encoding associated with it, including unicode strings 
>> produced by the Python parser when it parses the ascii string "u'\xb5'"
>> 
>> My question is: what is that encoding?
>
>The internal representation is either UTF-16, or UTF-32; which one is
>a compile-time choice (i.e. when the Python interpreter is built).

Wait, I thought it was UCS-2 or UCS-4?  Or am I misremembering the
countless threads about the distinction between UTF and UCS?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From thorsten at thorstenkampe.de  Sat Feb 21 13:20:12 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 19:20:12 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240a64495647d8329897c6@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 12:22:36 -0500)
> =?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=  <martin at v.loewis.de> wrote:
> >I don't think that was the complaint. Instead, the complaint was
> >that the OP's original message did not have a Content-type header,
> >and that it was thus impossible to tell what the byte in front of
> >"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
> >MU in a usenet or email message, you really must use MIME. (As both
> >your article and Thorsten's did, by choosing UTF-8)
> 
> MIME only applies Internet e-mail messages.

No, it doesn't: "MIME's use, however, has grown beyond describing the 
content of e-mail to describing content type in general. [...]

The content types defined by MIME standards are also of importance 
outside of e-mail, such as in communication protocols like HTTP [...]"

http://en.wikipedia.org/wiki/MIME

> RFC 1036 doesn't require nor give a meaning to a Content-Type header
> in a Usenet message

Well, /maybe/ the reason for that is that RFC 1036 was written in 1987 
and the first MIME RFC in 1992...? The "Son of RFC 1036" mentions MIME 
more often than you can count.

> so there's nothing wrong with the original poster's newsreader.

If you follow RFC 1036 (who was written before anyone even thought of 
MIME) then all content has to ASCII. The OP used non ASCII letters.

It's all about declaring your charset. In Python as well as in your 
newsreader. If you don't declare your charset it's ASCII for you - in 
Python as well as in your newsreader.

Thorsten


From thorsten at thorstenkampe.de  Sat Feb 21 13:24:23 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 19:24:23 +0100
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <MPG.240a65412c11a5ea9897c7@news.individual.de>

* "Martin v. L?wis" (Sat, 21 Feb 2009 00:15:08 +0100)
> > Yes, I know that. But every concrete representation of a unicode
> > string has to have an encoding associated with it, including unicode
> > strings produced by the Python parser when it parses the ascii
> > string "u'\xb5'"
> > 
> > My question is: what is that encoding?
> 
> The internal representation is either UTF-16, or UTF-32; which one is
> a compile-time choice (i.e. when the Python interpreter is built).

I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a 
slight difference to UTF-16/UTF-32).

Thorsten


From massi_srb at msn.com  Sat Feb 21 13:56:03 2009
From: massi_srb at msn.com (Massi)
Date: Sat, 21 Feb 2009 10:56:03 -0800 (PST)
Subject: Ctypes debug of dll function
Message-ID: <1eef6de3-ebfc-45d5-845d-6345a4563c2e@f3g2000yqf.googlegroups.com>

Hi everyone, I'm pretty new to the ctypes module and I'm encountering
a problem. I'm working under windows xp with python 2.5 and in my
script I use ctypes to call from a dll some functions I wrote in C.
When I call one of these functions it happens that my script crashes
raising the following error:
WindowsError: exception: access violation writing 0x00000000
My question is...is there a way to debug my C function from the dll
while it is run from the python script?
Thanks in advance for the help.


From benjamin.kaplan at case.edu  Sat Feb 21 14:02:19 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 21 Feb 2009 14:02:19 -0500
Subject: "Byte" type?
In-Reply-To: <49a03081$0$1599$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net>
Message-ID: <ec96e1390902211102o7ae5f35cx7f0e5723d3180cd2@mail.gmail.com>

On Sat, Feb 21, 2009 at 12:21 PM, John Nagle <nagle at animats.com> wrote:

> Steve Holden wrote:
>
>> John Nagle wrote:
>>
>>> Steve Holden wrote:
>>>
>>>> John Nagle wrote:
>>>>
>>>>> Benjamin Kaplan wrote:
>>>>>
>>>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com>
>>>>>> wrote:
>>>>>>
>>>>>>  ...Re "bytes" not behaving as documented in 2.6:
>>>
>>>    That's indeed how Python 2.6 works.  But that's not how
>>>>> PEP 3137 says it's supposed to work.
>>>>>
>>>>> Guido:
>>>>>
>>>>>  "I propose the following type names at the Python level:
>>>>>
>>>>>        * bytes is an immutable array of bytes (PyString)
>>>>>        * bytearray is a mutable array of bytes (PyBytes)"
>>>>>
>>>> ...
>>>
>>>> (Not true in Python 2.6
>>>>> Is this a bug, a feature, a documentation error, or bad design?
>>>>>
>>>>>  It's a feature. In fact all that was done to accommodate easier
>>>> migration to 3.x is easily shown in one statement:
>>>>
>>>>  str is bytes
>>>>>>>
>>>>>> True
>>>>
>>>> So that's why bytes works the way it does in 2.6 ... hence my contested
>>>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>>>> I think "hack" could still be held to apply.
>>>>
>>>   Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
>>> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
>>>
>>>   The way it works in 2.6 makes it necessary to do "ord" conversions
>>> where they shouldn't be required.
>>>
>>>  Yes, the hack was to achieve a modicum of compatibility with 3.0 without
>> having to turn the world upside down.
>>
>> I haven't used 3.0 enough the say whether bytearray has been correctly
>> implemented. But I believe the intention is that 3.0 should fully
>> implement PEP 3137.
>>
>
>   If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> really
> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> it has to be converted AGAIN for 3.0.  That's a good reason to ignore 2.6
> as
> defective.
>

"""

The primary use of bytes in 2.6 will be to write tests of object type such
as isinstance(x, bytes). This will help the 2to3 converter, which can't tell
whether 2.x code intends strings to contain either characters or 8-bit
bytes; you can now use either bytes or
str<http://docs.python.org/library/functions.html#str>to represent
your intention exactly, and the resulting code will also be
correct in Python 3.0.

"""

The reason for putting bytes (a new type, not a keyword) into 2.6 was purely
for use in the 2to3 tool. It is designed to break less code on the
conversion from 2.x to 3.x, not to add extra features to 2.6+.


>
>                                        John Nagle
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bkline at rksystems.com  Sat Feb 21 14:16:12 2009
From: bkline at rksystems.com (Bob Kline)
Date: Sat, 21 Feb 2009 14:16:12 -0500
Subject: Change in cgi handling of POST requests
In-Reply-To: <gnp50i$i24$1@panix3.panix.com>
References: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>
	<gnp50i$i24$1@panix3.panix.com>
Message-ID: <rJidnTCLMulgzz3UnZ2dnUVZ_vninZ2d@speakeasy.net>

Aahz wrote:

> Interesting.  Nobody has responded, so I suggest first filing a report
> using bugs.python.org and then asking on python-dev (with reference to
> your report).

http://bugs.python.org/issue5340

Cheers,
Bob


From denis.kasak at gmail.com  Sat Feb 21 14:32:10 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 20:32:10 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <MPG.240a65412c11a5ea9897c7@news.individual.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
Message-ID: <39e19a010902211132m39730333vd8d76f334115d206@mail.gmail.com>

On Sat, Feb 21, 2009 at 7:24 PM, Thorsten Kampe
<thorsten at thorstenkampe.de> wrote:
>
> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
> slight difference to UTF-16/UTF-32).

I wouldn't call the difference that slight, especially between UTF-16
and UCS-2, since the former can encode all Unicode code points, while
the latter can only encode those in the BMP.

--
Denis Kasak


From rridge at csclub.uwaterloo.ca  Sat Feb 21 14:52:09 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 14:52:09 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
Message-ID: <gnpm19$rvm$1@rumours.uwaterloo.ca>

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>> RFC 1036 doesn't require nor give a meaning to a Content-Type header
>> in a Usenet message
>
>Well, /maybe/ the reason for that is that RFC 1036 was written in 1987 
>and the first MIME RFC in 1992...?

Obviously.

>"Son of RFC 1036" mentions MIME more often than you can count.

Since it was never sumbitted and accepted, RFC 1036 remains current.

>> so there's nothing wrong with the original poster's newsreader.
>
>If you follow RFC 1036 (who was written before anyone even thought of 
>MIME) then all content has to ASCII. The OP used non ASCII letters.

RFC 1036 doesn't place any restrictions on the content on the body of
an article.  On the other hand "Son of RFC 1036" does have restrictions
on characters used in the body of message:

	Articles MUST not contain any octet with value exceeding 127,
	i.e. any octet that is not an ASCII character

Which means that merely adding a Content-Encoding header wouldn't
be enough to conform to "Son of RFC 1036", the original poster would
also have had to either switch to a 7-bit character set or use a 7-bit
compatible transfer encoding.  If you trying to claim that "Son of RFC
1036" is the new defacto standard, then that would mean your newsreader
is broken too.

>It's all about declaring your charset. In Python as well as in your 
>newsreader. If you don't declare your charset it's ASCII for you - in 
>Python as well as in your newsreader.

Except in practice unlike Python, many newsreaders don't assume ASCII.
The original article displayed fine for me.  Google Groups displays it
correctly too:

	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc

I could just as easily argue that assuming ISO 8859-1 is the defacto
standard, and that its your newsreader that's broken.  The reality however
is that RFC 1036 is the only standard for Usenet messages, defacto or
otherwise, and so there's nothing wrong with anyone's newsreader.

				Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From martin at v.loewis.de  Sat Feb 21 15:06:27 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 21 Feb 2009 21:06:27 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <gnpep5$194$1@panix3.panix.com>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de> <gnpep5$194$1@panix3.panix.com>
Message-ID: <49A05EC3.6080209@v.loewis.de>

>>> My question is: what is that encoding?
>> The internal representation is either UTF-16, or UTF-32; which one is
>> a compile-time choice (i.e. when the Python interpreter is built).
> 
> Wait, I thought it was UCS-2 or UCS-4?  Or am I misremembering the
> countless threads about the distinction between UTF and UCS?

You are not misremembering. I personally never found them conclusive,
and, with PEP 261, I think, calling the 2-byte version "UCS-2" is
incorrect.

Regards,
Martin


From martin at v.loewis.de  Sat Feb 21 15:10:30 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 21:10:30 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <mailman.421.1235244733.11746.python-list@python.org>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>	<499F397C.7030404@v.loewis.de>	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
Message-ID: <49a05fb6$0$30900$9b622d9e@news.freenet.de>

>> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
>> slight difference to UTF-16/UTF-32).
> 
> I wouldn't call the difference that slight, especially between UTF-16
> and UCS-2, since the former can encode all Unicode code points, while
> the latter can only encode those in the BMP.

Indeed. As Python *can* encode all characters even in 2-byte mode
(since PEP 261), it seems clear that Python's Unicode representation
is *not* strictly UCS-2 anymore.

Regards,
Martin


From rozzin at geekspace.com  Sat Feb 21 15:13:26 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 15:13:26 -0500
Subject: `high overhead of multiple Python processes' (was: Will
	multithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <87mycfczvd.fsf_-_@slice.rozzin.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>
> Right, that's basically the issue here: the cost of using multiple
> Python processes is unnecessarily high.  If that cost were lower then
> we could more easily use multiple cores to make oru apps faster.

What cost is that? At least on unix systems, fork() tends have
*trivial* overhead in terms of both time and space, because the
processes use lazy copy-on-write memory underneath, so the real costs
of resource-consumption for spawning a new process vs. spawning a new
thread should be comparable.

Are you referring to overhead associated with inter-process
communication? If so, what overhead is that?

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From john.weatherwax at gmail.com  Sat Feb 21 15:22:38 2009
From: john.weatherwax at gmail.com (john.weatherwax at gmail.com)
Date: Sat, 21 Feb 2009 12:22:38 -0800 (PST)
Subject: urllib2 login help
Message-ID: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>

Hello,

I'm having trouble using urllib2 (maybe) when trying to log into a web
site that requires a user to enter a login name and a password
(authentication).  I've tried many things but none seem to work and
have become stuck recently and was hoping to get a hint from those
much more knowledgeable than myself.

I want to automate logging on to the investopedia stock simulator web
site.

http://simulator.investopedia.com/authorization/login.aspx

I can't seem to automate this successfully.

My python script is below:

import os,re
import urllib, urllib2

theurl = "http://simulator.investopedia.com/authorization/login.aspx"

post_dict = { "ct100$MainPlaceHolder$usernameText": "XXX",
"ct100$MainPlaceHolder$passwordText": "XXX", "ct100$MainPlaceHolder
$loginButton": "Sign In", "ct100$MainPlaceHolder$rememberMeCheckBox":
"on" }

post_data = urllib.urlencode( post_dict )

headers = { 'User-agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
NT)',
            'Host': 'simulator.investopedia.com',
            'Referer': 'http://simulator.investopedia.com/
authorization/login.aspx',
            }

req = urllib2.Request( theurl, post_data, headers )
response = urllib2.urlopen(req)
the_page = response.read()

The problem is that this page returned seems to be the same as the
login page which I connected to initially.  When I perform the login
process manually things work as expected.  What am I doing
incorrectly?

*ANY* hints/suggestions/directions would be very appreciated since
I've run out of ideas of things to try at this point.

Thanks very much




From denis.kasak at gmail.com  Sat Feb 21 15:24:30 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 21:24:30 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <49a05fb6$0$30900$9b622d9e@news.freenet.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
Message-ID: <39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>

On Sat, Feb 21, 2009 at 9:10 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>>> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
>>> slight difference to UTF-16/UTF-32).
>>
>> I wouldn't call the difference that slight, especially between UTF-16
>> and UCS-2, since the former can encode all Unicode code points, while
>> the latter can only encode those in the BMP.
>
> Indeed. As Python *can* encode all characters even in 2-byte mode
> (since PEP 261), it seems clear that Python's Unicode representation
> is *not* strictly UCS-2 anymore.

Since we're already discussing this, I'm curious - why was UCS-2
chosen over plain UTF-16 or UTF-8 in the first place for Python's
internal storage?

-- 
Denis Kasak


From apt.shansen at gmail.com  Sat Feb 21 15:36:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 21 Feb 2009 12:36:56 -0800
Subject: urllib2 login help
In-Reply-To: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
References: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
Message-ID: <7a9c25c20902211236y28e14833y1e475ea0cc0c9829@mail.gmail.com>

>
> *ANY* hints/suggestions/directions would be very appreciated since
> I've run out of ideas of things to try at this point.
>

The last time I heard something like this, I suggested that the problem
might be cookies -- and it ended up working for the person I believe.

http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d78de927ee1e549

--S
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From rhamph at gmail.com  Sat Feb 21 15:39:22 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Sat, 21 Feb 2009 12:39:22 -0800 (PST)
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net> 
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net> 
	<499F397C.7030404@v.loewis.de> <gnpep5$194$1@panix3.panix.com>
Message-ID: <06779757-e822-4cba-adba-69f669acf92c@k19g2000yqg.googlegroups.com>

On Feb 21, 10:48?am, a... at pythoncraft.com (Aahz) wrote:
> In article <499F397C.7030... at v.loewis.de>,
>
> =?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?= ?<mar... at v.loewis.de> wrote:
> >> Yes, I know that. ?But every concrete representation of a unicode string
> >> has to have an encoding associated with it, including unicode strings
> >> produced by the Python parser when it parses the ascii string "u'\xb5'"
>
> >> My question is: what is that encoding?
>
> >The internal representation is either UTF-16, or UTF-32; which one is
> >a compile-time choice (i.e. when the Python interpreter is built).
>
> Wait, I thought it was UCS-2 or UCS-4? ?Or am I misremembering the
> countless threads about the distinction between UTF and UCS?

Nope, that's partly mislabeling and partly a bug.  UCS-2/UCS-4 refer
to Unicode 1.1 and earlier, with no surrogates.  We target Unicode
5.1.

If you naively encode UCS-2 as UTF-8 you really end up with CESU-8.
You miss the step where you combine surrogate pairs (which only exist
in UTF-16) into a single supplementary character.  Lo and behold,
that's actually what current python does in some places.  It's not
pretty.

See bugs #3297 and #3672.


From martin at v.loewis.de  Sat Feb 21 15:45:09 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 21:45:09 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>	
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>	
	<499F397C.7030404@v.loewis.de>	
	<MPG.240a65412c11a5ea9897c7@news.individual.de>	
	<mailman.421.1235244733.11746.python-list@python.org>	
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
	<39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
Message-ID: <49A067D5.9000404@v.loewis.de>

>> Indeed. As Python *can* encode all characters even in 2-byte mode
>> (since PEP 261), it seems clear that Python's Unicode representation
>> is *not* strictly UCS-2 anymore.
> 
> Since we're already discussing this, I'm curious - why was UCS-2
> chosen over plain UTF-16 or UTF-8 in the first place for Python's
> internal storage?

You mean, originally? Originally, the choice was only between UCS-2
and UCS-4; choice was in favor of UCS-2 because of size concerns.
UTF-8 was ruled out easily because it doesn't allow constant-size
indexing; UTF-16 essentially for the same reason (plus there was
no point to UTF-16, since there were no assigned characters outside
the BMP).

Regards,
Martin





From denis.kasak at gmail.com  Sat Feb 21 15:48:05 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 21:48:05 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <49A067D5.9000404@v.loewis.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
	<39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
	<49A067D5.9000404@v.loewis.de>
Message-ID: <39e19a010902211248h280b4949q7279b88fafe93c62@mail.gmail.com>

On Sat, Feb 21, 2009 at 9:45 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>>> Indeed. As Python *can* encode all characters even in 2-byte mode
>>> (since PEP 261), it seems clear that Python's Unicode representation
>>> is *not* strictly UCS-2 anymore.
>>
>> Since we're already discussing this, I'm curious - why was UCS-2
>> chosen over plain UTF-16 or UTF-8 in the first place for Python's
>> internal storage?
>
> You mean, originally? Originally, the choice was only between UCS-2
> and UCS-4; choice was in favor of UCS-2 because of size concerns.
> UTF-8 was ruled out easily because it doesn't allow constant-size
> indexing; UTF-16 essentially for the same reason (plus there was
> no point to UTF-16, since there were no assigned characters outside
> the BMP).

Yes, I failed to realise how long ago the unicode data type was
implemented originally. :-)
Thanks for the explanation.

-- 
Denis Kasak


From thorsten at thorstenkampe.de  Sat Feb 21 16:05:39 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 22:05:39 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240a8b0f8b7d32969897c8@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>> It's all about declaring your charset. In Python as well as in your
>> newsreader. If you don't declare your charset it's ASCII for you - in
>> Python as well as in your newsreader.
> 
> Except in practice unlike Python, many newsreaders don't assume ASCII.

They assume ASCII - unless you declare your charset (the exception being 
Outlook Express and a few Windows newsreaders). Everything else is 
"guessing".

> The original article displayed fine for me. Google Groups displays it
> correctly too:
> 
> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc

Your understanding of the principles of Unicode is as least as non-
existant as the OP's.
 
> I could just as easily argue that assuming ISO 8859-1 is the defacto
> standard, and that its your newsreader that's broken.

There is no "standard" in regard to guessing (this is what you call 
"assuming"). The need for explicit declaration of an encoding is exactly 
the same in Python as in any Usenet article.

> The reality however is that RFC 1036 is the only standard for Usenet
> messages, defacto or otherwise, and so there's nothing wrong with
> anyone's newsreader.

The reality is that all non-broken newsreaders use MIME headers to 
declare and interpret the charset being used. I suggest you read at 
least http://www.joelonsoftware.com/articles/Unicode.html to get an idea 
of Unicode and associated topics.

Thorsten


From odeits at gmail.com  Sat Feb 21 16:12:32 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 13:12:32 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com> 
	<mailman.409.1235206092.11746.python-list@python.org>
Message-ID: <9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>

On Feb 21, 12:47?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi?:
>
>
>
> > On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:
> >> It seems what you are actually testing for is if the intersection of
> >> the two sets is not empty where the first set is the characters in
> >> your word and the second set is the characters in your defined string.
>
> > To expand on what I was saying I thought i should provide a code
> > snippet:
>
> > WORD = 'g' * 100
> > WORD2 = 'g' * 50 + 'U'
> > VOWELS = 'aeiouAEIOU'
> > BIGWORD = 'g' * 10000 + 'U'
>
> > def set_test(vowels, word):
>
> > ? ? vowels = set( iter(vowels))
> > ? ? letters = set( iter(word) )
>
> > ? ? if letters & vowels:
> > ? ? ? ? return True
> > ? ? else:
> > ? ? ? ? return False
>
> > with python 2.5 I got 1.30 usec/pass against the BIGWORD
>
> You could make it slightly faster by removing the iter() call: letters = ?
> set(word)
> And (if vowels are really constant) you could pre-build the vowels set.
>
> --
> Gabriel Genellina

set(word) = set{[word]} meaning a set with one element, the string
the call to iter makes it set of the letters making up the word.


From alia_khouri at yahoo.com  Sat Feb 21 16:31:07 2009
From: alia_khouri at yahoo.com (Alia K)
Date: Sat, 21 Feb 2009 13:31:07 -0800 (PST)
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
	<gnpeda$4tp$1@panix3.panix.com>
Message-ID: <c6b9e335-a04d-44cb-b18e-18a52eef1586@k19g2000yqg.googlegroups.com>

Aahz wrote:
> Longer answer: the way in Python to achieve the full power of Ruby
> blocks is to write a function.

You are most likely right... there is probably no need to introduce
ruby-like blocks to python where iteration comes naturally with list
comprehensions and generators. But for the simple case of entering a
block of code as one does with @contextmanager I suppose it would be
nice to make a generator with a single yield statement a
contextmanager by default such that:

>>> def g():
...     print "a"
...     yield
...     print "b"
...
>>> with g():
...     print "c"
...
a
c
b

would be equivalent to

>>> from __future__ import with_statement
>>> from contextlib import contextmanager
>>> @contextmanager
... def g():
...     print "a"
...     yield
...     print "b"
...
>>> with g():
...     print "c"
...
a
c
b

but then again, I suppose "explicit is better than implicit"...

AK



From http  Sat Feb 21 17:02:27 2009
From: http (Paul Rubin)
Date: 21 Feb 2009 14:02:27 -0800
Subject: `high overhead of multiple Python processes' (was: Will
	multithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<87mycfczvd.fsf_-_@slice.rozzin.com>
Message-ID: <7xfxi75tzg.fsf@ruckus.brouhaha.com>

Joshua Judson Rosen <rozzin at geekspace.com> writes:
> > Right, that's basically the issue here: the cost of using multiple
> > Python processes is unnecessarily high.
> What cost is that? 

The cost of messing with the multiprocessing module instead of having
threads work properly, and the overhead of serializing Python data
structures to send to another process by IPC, instead of using the
same object in two threads.  Also, one way I often use threading is by
sending function objects to another thread through a Queue, so the
other thread can evaluate the function.  I don't think multiprocessing
gives a way to serialize functions, though maybe something like it
can be done at higher nuisance using classes.


From rridge at csclub.uwaterloo.ca  Sat Feb 21 17:07:35 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 17:07:35 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
Message-ID: <gnptv7$u4b$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
> Except in practice unlike Python, many newsreaders don't assume ASCII.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>They assume ASCII - unless you declare your charset (the exception being 
>Outlook Express and a few Windows newsreaders). Everything else is 
>"guessing".

No, it's an assumption like the way Python by default assumes ASCII.

>> The original article displayed fine for me. Google Groups displays it
>> correctly too:
>> 
>> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc
>
>Your understanding of the principles of Unicode is as least as non-
>existant as the OP's.
 
The link demonstrates that Google Groups doesn't assume ASCII like
Python does.  Since popular newsreaders like Google Groups and Outlook
Express can display the message correctly without the MIME headers,
but your obscure one can't, there's a much stronger case to made that
it's your newsreader that's broken.

>> I could just as easily argue that assuming ISO 8859-1 is the defacto
>> standard, and that its your newsreader that's broken.
>
>There is no "standard" in regard to guessing (this is what you call 
>"assuming"). The need for explicit declaration of an encoding is exactly 
>the same in Python as in any Usenet article.

No, many newsreaders don't assume ASCII by default like Python. 

>> The reality however is that RFC 1036 is the only standard for Usenet
>> messages, defacto or otherwise, and so there's nothing wrong with
>> anyone's newsreader.
>
>The reality is that all non-broken newsreaders use MIME headers to 
>declare and interpret the charset being used. 

Since RFC 1036 doesn't require MIME headers a reader that doesn't generate
them is by definition not broken.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From rdmurray at bitdance.com  Sat Feb 21 17:24:51 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 21 Feb 2009 22:24:51 +0000 (UTC)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>
	<mailman.409.1235206092.11746.python-list@python.org>
	<9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>
Message-ID: <gnpuvi$974$1@ger.gmane.org>

odeits <odeits at gmail.com> wrote:
> On Feb 21, 12:47=A0am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
> > En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi=F3:
> >
> > > On Feb 15, 11:31=A0pm, odeits <ode... at gmail.com> wrote:
> > >> It seems what you are actually testing for is if the intersection of
> > >> the two sets is not empty where the first set is the characters in
> > >> your word and the second set is the characters in your defined string.
> >
> > > To expand on what I was saying I thought i should provide a code
> > > snippet:
> >
> > > WORD = 'g' * 100
> > > WORD2 = 'g' * 50 + 'U'
> > > VOWELS = 'aeiouAEIOU'
> > > BIGWORD = 'g' * 10000 + 'U'
> >
> > > def set_test(vowels, word):
> >
> > >  vowels = set( iter(vowels))
> > >  letters = set( iter(word) )
> >
> > >  if letters & vowels:
> > >      return True
> > >  else:
> > >     return False
> >
> > > with python 2.5 I got 1.30 usec/pass against the BIGWORD
> >
> > You could make it slightly faster by removing the iter() call:
> > letters = set(word)
> > And (if vowels are really constant) you could pre-build the vowels set.
> 
> set(word) = set{[word]} meaning a set with one element, the string
> the call to iter makes it set of the letters making up the word.

Did you try it?

Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> set('abcd')
set(['a', 'c', 'b', 'd'])

--RDM



From pavlovevidence at gmail.com  Sat Feb 21 17:24:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 21 Feb 2009 14:24:55 -0800 (PST)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <de63f874-8d5f-403f-9538-a15e4a8114e3@f3g2000yqf.googlegroups.com>

On Feb 19, 6:57?pm, Ron Garret <rNOSPA... at flownet.com> wrote:
> I'm writing a little wiki that I call ?Wiki. ?That's a lowercase Greek
> mu at the beginning (it's pronounced micro-wiki). ?It's working, except
> that I can't actually enter the name of the wiki into the wiki itself
> because the default unicode encoding on my Python installation is
> "ascii". ?So I'm trying to decide on a course of action. ?There seem to
> be three possibilities:
>
> 1. ?Change the code to properly support unicode. ?Preliminary
> investigations indicate that this is going to be a colossal pain in the
> ass.
>
> 2. ?Change the default encoding on my Python installation to be latin-1
> or UTF8. ?The disadvantage to this is that no one else will be able to
> run my code without making the same change to their installation, since
> you can't change default encodings once Python has started.
>
> 3. ?Punt and spell it 'uwiki' instead.
>
> I'm feeling indecisive so I thought I'd ask other people's opinion. ?
> What should I do?
>
> rg



From ethan at stoneleaf.us  Sat Feb 21 17:44:42 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 21 Feb 2009 14:44:42 -0800
Subject: datetime.time and midnight
Message-ID: <49A083DA.7000107@stoneleaf.us>

Greetings, List!

I was curious if anyone knew the rationale behind making midnight False?

--> import datetime
--> midnight = datetime.time(0,0,0)
--> bool(midnight)
False

To my way of thinking, midnight does actually exist so it should be 
true.  If datetime.time was measuring an *amount* of time, rather than a 
certain point during the day, then a time of 0:0:0 should certainly be 
False as it would mean no time had passed.  However, since midnight does 
indeed exist (as many programmers have observed when deadlines approach 
;) I would think it should be true.
--
~Ethan~


From thorsten at thorstenkampe.de  Sat Feb 21 17:52:03 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 23:52:03 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240aa3fa43f4cb299897c9@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 17:07:35 -0500)
> The link demonstrates that Google Groups doesn't assume ASCII like
> Python does.  Since popular newsreaders like Google Groups and Outlook
> Express can display the message correctly without the MIME headers,
> but your obscure one can't, there's a much stronger case to made that
> it's your newsreader that's broken.

*sigh* I give up on you. You didn't even read the "Joel on Software" 
article. The whole "why" and "what for" of Unicode and MIME will always 
be a complete mystery to you.

T.


From rridge at csclub.uwaterloo.ca  Sat Feb 21 18:06:35 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 18:06:35 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
Message-ID: <gnq1dr$v2n$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 17:07:35 -0500) 
> The link demonstrates that Google Groups doesn't assume ASCII like
> Python does.  Since popular newsreaders like Google Groups and Outlook
> Express can display the message correctly without the MIME headers,
> but your obscure one can't, there's a much stronger case to made that
> it's your newsreader that's broken.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>*sigh* I give up on you. You didn't even read the "Joel on Software" 
>article. The whole "why" and "what for" of Unicode and MIME will always 
>be a complete mystery to you.

I understand what Unicode and MIME are for and why they exist.  Neither
their merits nor your insults change the fact that the only current
standard governing the content of Usenet posts doesn't require their use.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From aahz at pythoncraft.com  Sat Feb 21 18:29:32 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 15:29:32 -0800
Subject: zlib interface semi-broken
References: <20090210205739.GT6522@subspacefield.org>
	<mailman.9414.1234459585.3487.python-list@python.org>
Message-ID: <gnq2os$di6$1@panix3.panix.com>

In article <mailman.9414.1234459585.3487.python-list at python.org>,
Travis  <travis+ml-python at subspacefield.org> wrote:
>
>So I've submitted a patch to bugs.python.org to add a new member
>called is_finished to the zlib decompression object.
>
>Issue 5210, file 13056, msg 81780

You may also want to bring this up on the python-ideas mailing list for
further discussion.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From thorsten at thorstenkampe.de  Sat Feb 21 18:35:35 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sun, 22 Feb 2009 00:35:35 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240aae2e3eecab709897ca@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
> > The link demonstrates that Google Groups doesn't assume ASCII like
> > Python does.  Since popular newsreaders like Google Groups and Outlook
> > Express can display the message correctly without the MIME headers,
> > but your obscure one can't, there's a much stronger case to made that
> > it's your newsreader that's broken.
> 
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >*sigh* I give up on you. You didn't even read the "Joel on Software" 
> >article. The whole "why" and "what for" of Unicode and MIME will always 
> >be a complete mystery to you.
> 
> I understand what Unicode and MIME are for and why they exist. Neither
> their merits nor your insults change the fact that the only current
> standard governing the content of Usenet posts doesn't require their
> use.

That's right. As long as you use pure ASCII you can skip this nasty step 
of informing other people which charset you are using. If you do use non 
ASCII then you have to do that. That's the way virtually all newsreaders 
work. It has nothing to do with some 21+ year old RFC. Even your Google 
Groups "newsreader" does that ('content="text/html; charset=UTF-8"').

Being explicit about your encoding is 99% of the whole Unicode magic in 
Python and in any communication across the Internet (may it be NNTP, 
SMTP or HTTP). Your Google Groups simply uses heuristics to guess the 
encoding the OP probably used. Windows newsreaders simply use the locale 
of the local host. That's guessing. You can call it assuming but it's 
still guessing. There is no way you can be sure without any declaration.

And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded 
text doesn't fit that encoding it refuses to guess.

T.


From google at mrabarnett.plus.com  Sat Feb 21 18:55:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 21 Feb 2009 23:55:23 +0000
Subject: datetime.time and midnight
In-Reply-To: <49A083DA.7000107@stoneleaf.us>
References: <49A083DA.7000107@stoneleaf.us>
Message-ID: <49A0946B.8040206@mrabarnett.plus.com>

Ethan Furman wrote:
> Greetings, List!
> 
> I was curious if anyone knew the rationale behind making midnight False?
> 
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
> 
> To my way of thinking, midnight does actually exist so it should be 
> true.  If datetime.time was measuring an *amount* of time, rather than a 
> certain point during the day, then a time of 0:0:0 should certainly be 
> False as it would mean no time had passed.  However, since midnight does 
> indeed exist (as many programmers have observed when deadlines approach 
> ;) I would think it should be true.
> 
I think it's because midnight is to the time of day what zero is to
integers, or an empty string is to strings, or an empty container ...


From Graham.Dumpleton at gmail.com  Sat Feb 21 18:58:45 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 21 Feb 2009 15:58:45 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com>
Message-ID: <83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com>

On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Jesse Noller <jnol... at gmail.com> writes:
>
> > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > <Graham.Dumple... at gmail.com> wrote:
> > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > _bootstrap() doing:
>
> > > ?os.close(sys.stdin.fileno())
>
> > > rather than:
>
> > > ?sys.stdin.close()
>
> > > Technically it is feasible that stdin could have been replaced with
> > > something other than a file object, where the replacement doesn't have
> > > a fileno() method.
>
> > > In that sort of situation an AttributeError would be raised, which
> > > isn't going to be caught as either OSError or ValueError, which is all
> > > the code watches out for.
>
> > I don't know why it was implemented that way. File an issue on the
> > tracker and assign it to me (jnoller) please.
>
> My guess would be: because it's also possible for sys.stdin to be a
> file that's open in read+*write* mode, and for that file to have
> pending output buffered (for example, in the case of a socketfile).

If you are going to have a file that is writable as well as readable,
such as a socket, then likely that sys.stdout/sys.stderr are going to
be bound to it at the same time. If that is the case then one should
not be using close() at all as it will then also close the write side
of the pipe and cause errors when code subsequently attempts to write
to sys.stdout/sys.stderr.

In the case of socket you would actually want to use shutdown() to
close just the input side of the socket.

What this all means is that what is the appropriate thing to do is
going to depend on the environment in which the code is used. Thus,
having the behaviour hard wired a certain way is really bad. There
perhaps instead should be a way of a user providing a hook function to
be called to perform any case specific cleanup of stdin, stdout and
stderr, or otherwise reassign them.

That this is currently in the _bootstrap() function, which does other
important stuff, doesn't exactly make it look like it is easily
overridden to work for a specific execution environment which is
different to the norm.

> There's a general guideline, inherited from C, that one should ensure
> that the higher-level close() routine is invoked on a given
> file-descriptor in at most *one* process after that descriptor has
> passed through a fork(); in the other (probably child) processes, the
> lower-level close() routine should be called to avoid a
> double-flush--whereby buffered data is flushed out of one process, and
> then the *same* buffered data is flushed out of the (other)
> child-/parent-process' copy of the file-object.
>
> So, if you call sys.stdin.close() in the child-process in
> _bootstrap(), then it could lead to a double-flush corrupting output
> somewhere in the application that uses the multiprocessing module.
>
> You can expect similar issues with just about /any/ `file-like objects'
> that might have `file-like semantics' of buffering data and flushing
> it on close, also--because you end up with multiple copies of the same
> object in `pre-flush' state, and each copy tries to flush at some point.
>
> As such, I'd recommend against just using .close(); you might use
> something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> `else' clause unconditionally calls sys.stdin.close(), then you still
> have double-flush problems if someone's set sys.stdin to a file-like
> object with output-buffering.
>
> I guess you could try calling that an `edge-case' and seeing if anyone
> screams. It'd be sort-of nice if there was finer granularity in the
> file API--maybe if file.close() took a boolean `flush' argument....

Graham


From rridge at csclub.uwaterloo.ca  Sat Feb 21 19:39:42 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 19:39:42 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
Message-ID: <gnq6se$n4$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
> I understand what Unicode and MIME are for and why they exist. Neither
> their merits nor your insults change the fact that the only current
> standard governing the content of Usenet posts doesn't require their
> use.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>That's right. As long as you use pure ASCII you can skip this nasty step 
>of informing other people which charset you are using. If you do use non 
>ASCII then you have to do that. That's the way virtually all newsreaders 
>work. It has nothing to do with some 21+ year old RFC. Even your Google 
>Groups "newsreader" does that ('content="text/html; charset=UTF-8"').

No, the original post demonstrates you don't have include MIME headers for
ISO 8859-1 text to be properly displayed by many newsreaders.  The fact
that your obscure newsreader didn't display it properly doesn't mean
that original poster's newsreader is broken.

>Being explicit about your encoding is 99% of the whole Unicode magic in 
>Python and in any communication across the Internet (may it be NNTP, 
>SMTP or HTTP).

HTTP requires the assumption of ISO 8859-1 in the absense of any
specified encoding. 

>Your Google Groups simply uses heuristics to guess the 
>encoding the OP probably used. Windows newsreaders simply use the locale 
>of the local host. That's guessing. You can call it assuming but it's 
>still guessing. There is no way you can be sure without any declaration.

Newsreaders assuming ISO 8859-1 instead of ASCII doesn't make it a guess.
It's just a different assumption, nor does making an assumption, ASCII
or ISO 8850-1, give you any certainty.

>And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded 
>text doesn't fit that encoding it refuses to guess.

Which is reasonable given that Python is programming language where it's
better to have more conservative assumption about encodings so errors
can be more quickly diagnosed.  A newsreader however is a different
beast, where it's better to make a less conservative assumption that's
more likely to display messages correctly to the user.  Assuming ISO
8859-1 in the absense of any specified encoding allows the message to be
correctly displayed if the character set is either ISO 8859-1 or ASCII.
Doing things the "pythonic" way and assuming ASCII only allows such
messages to be displayed if ASCII is used.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From odeits at gmail.com  Sat Feb 21 19:53:25 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 16:53:25 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com> 
	<mailman.409.1235206092.11746.python-list@python.org>
	<9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>
	<mailman.426.1235255122.11746.python-list@python.org>
Message-ID: <2811f9f5-ca08-47f3-b70d-4106443d3b36@a12g2000yqm.googlegroups.com>

On Feb 21, 2:24?pm, rdmur... at bitdance.com wrote:
> odeits <ode... at gmail.com> wrote:
> > On Feb 21, 12:47=A0am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> > > En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi=F3:
>
> > > > On Feb 15, 11:31=A0pm, odeits <ode... at gmail.com> wrote:
> > > >> It seems what you are actually testing for is if the intersection of
> > > >> the two sets is not empty where the first set is the characters in
> > > >> your word and the second set is the characters in your defined string.
>
> > > > To expand on what I was saying I thought i should provide a code
> > > > snippet:
>
> > > > WORD = 'g' * 100
> > > > WORD2 = 'g' * 50 + 'U'
> > > > VOWELS = 'aeiouAEIOU'
> > > > BIGWORD = 'g' * 10000 + 'U'
>
> > > > def set_test(vowels, word):
>
> > > > ?vowels = set( iter(vowels))
> > > > ?letters = set( iter(word) )
>
> > > > ?if letters & vowels:
> > > > ? ? ?return True
> > > > ?else:
> > > > ? ? return False
>
> > > > with python 2.5 I got 1.30 usec/pass against the BIGWORD
>
> > > You could make it slightly faster by removing the iter() call:
> > > letters = set(word)
> > > And (if vowels are really constant) you could pre-build the vowels set.
>
> > set(word) = set{[word]} meaning a set with one element, the string
> > the call to iter makes it set of the letters making up the word.
>
> Did you try it?
>
> Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> set('abcd')
>
> set(['a', 'c', 'b', 'd'])
>
> --RDM

You are in fact correct. Thank you for pointing that out.


From thorsten at thorstenkampe.de  Sat Feb 21 20:25:54 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sun, 22 Feb 2009 02:25:54 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240ac80c16120c7b9897cb@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 19:39:42 -0500)
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >That's right. As long as you use pure ASCII you can skip this nasty step 
> >of informing other people which charset you are using. If you do use non 
> >ASCII then you have to do that. That's the way virtually all newsreaders 
> >work. It has nothing to do with some 21+ year old RFC. Even your Google 
> >Groups "newsreader" does that ('content="text/html; charset=UTF-8"').
> 
> No, the original post demonstrates you don't have include MIME headers for
> ISO 8859-1 text to be properly displayed by many newsreaders.

*sigh* As you still refuse to read the article[1] I'm going to quote it 
now here:

'The Single Most Important Fact About Encodings

If you completely forget everything I just explained, please remember 
one extremely important fact. It does not make sense to have a string 
without knowing what encoding it uses.
[...]
If you have a string [...] in an email message, you have to know what 
encoding it is in or you cannot interpret it or display it to users 
correctly.

Almost every [...] "she can't read my emails when I use accents" problem 
comes down to one naive programmer who didn't understand the simple fact 
that if you don't tell me whether a particular string is encoded using 
UTF-8 or ASCII or ISO 8859-1 (Latin 1) or Windows 1252 (Western 
European), you simply cannot display it correctly [...]. There are over 
a hundred encodings and above code point 127, all bets are off.'

Enough said.

> The fact that your obscure newsreader didn't display it properly
> doesn't mean that original poster's newsreader is broken.

You don't even know if my "obscure newsreader" displayed it properly. 
Non ASCII text without a declared encoding is just a bunch of bytes. 
It's not even text.

T.

[1] http://www.joelonsoftware.com/articles/Unicode.html


From db3l.net at gmail.com  Sat Feb 21 20:37:09 2009
From: db3l.net at gmail.com (David Bolen)
Date: Sat, 21 Feb 2009 20:37:09 -0500
Subject: Using clock() in threading on Windows
References: <mailman.389.1235175307.11746.python-list@python.org>
	<499fc63c$0$30913$9b622d9e@news.freenet.de>
Message-ID: <m263j3gsl6.fsf@valheru.db3l.homeip.net>

"Martin v. L?wis" <martin at v.loewis.de> writes:

> As a consequence, the half-busy loops could go away, at least
> on systems where lock timeouts can be given to the system.

I know that in some cases in the past I've had to bypass a Queue's use
of threading objects for waiting for a queue to unblock because of the
increased overhead (and latency as the timer increases) of the busy
loop.  On windows, replacing it with an implementation using
WaitForObject calls with the same timeouts I would have used with the
Queue performed much better, not unexpectedly, but was non-portable.

The current interface to the lowest level locks in Python are
certainly generic enough to cross lots of platforms, but it would
definitely be useful if they could implement timeouts without busy
loops on those platforms where they were supported.

-- David


From rozzin at geekspace.com  Sat Feb 21 20:52:19 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 20:52:19 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com>
	<83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com>
Message-ID: <87tz6ns0fg.fsf@slice.rozzin.com>

Graham Dumpleton <Graham.Dumpleton at gmail.com> writes:
>
> On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> > Jesse Noller <jnol... at gmail.com> writes:
> >
> > > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > > <Graham.Dumple... at gmail.com> wrote:
> > > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > > _bootstrap() doing:
> >
> > > > ?os.close(sys.stdin.fileno())
> >
> > > > rather than:
> >
> > > > ?sys.stdin.close()
> >
> > > > Technically it is feasible that stdin could have been replaced with
> > > > something other than a file object, where the replacement doesn't have
> > > > a fileno() method.
> >
> > > > In that sort of situation an AttributeError would be raised, which
> > > > isn't going to be caught as either OSError or ValueError, which is all
> > > > the code watches out for.
> >
> > > I don't know why it was implemented that way. File an issue on the
> > > tracker and assign it to me (jnoller) please.
> >
> > My guess would be: because it's also possible for sys.stdin to be a
> > file that's open in read+*write* mode, and for that file to have
> > pending output buffered (for example, in the case of a socketfile).
> 
> If you are going to have a file that is writable as well as readable,
> such as a socket, then likely that sys.stdout/sys.stderr are going to
> be bound to it at the same time.

Yes.

> If that is the case then one should not be using close() at all

If you mean stdin.close(), then that's what I said :)

> as it will then also close the write side of the pipe and cause
> errors when code subsequently attempts to write to
> sys.stdout/sys.stderr.
>
> 
> In the case of socket you would actually want to use shutdown() to
> close just the input side of the socket.

Sure--but isn't this "you" the /calling/ code that set the whole thing
up? What the /caller/ does with its stdio is up to /him/, and beyond
the scope of the present discourse. I can appreciate a library forking
and then using os.close() on stdio (it protects my files from any I/O
the subprocess might think it wants to do with them), but I think I
might be even more annoyed if it *shutdown my sockets* than if it
caused double-flushes (there's at least a possibility that I could
cope with the double-flushes by just ensuring that *I* flushed before
the fork--not so with socket.shutdown()!)

> What this all means is that what is the appropriate thing to do is
> going to depend on the environment in which the code is used. Thus,
> having the behaviour hard wired a certain way is really bad. There
> perhaps instead should be a way of a user providing a hook function to
> be called to perform any case specific cleanup of stdin, stdout and
> stderr, or otherwise reassign them.

Usually, I'd say that that's what the methods on the passed-in object
are for. Though, as I said--the file-object API is lacking, here :(

> > As such, I'd recommend against just using .close(); you might use
> > something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> > `else' clause unconditionally calls sys.stdin.close(), then you still
> > have double-flush problems if someone's set sys.stdin to a file-like
> > object with output-buffering.
> >
> > I guess you could try calling that an `edge-case' and seeing if anyone
> > screams. It'd be sort-of nice if there was finer granularity in the
> > file API--maybe if file.close() took a boolean `flush' argument....

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From seandc at att.net  Sat Feb 21 21:03:41 2009
From: seandc at att.net (Sean)
Date: Sun, 22 Feb 2009 02:03:41 GMT
Subject: Python dictionary size/entry limit?
In-Reply-To: <499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <1o2ol.392511$Mh5.120409@bgtnsc04-news.ops.worldnet.att.net>

Stefan Behnel wrote:
> intelliminer at gmail.com wrote:
> You may be better served with one of the dbm databases that come with
> Python. They live on-disk but do the usual in-memory caching. They'll
> likely perform a lot better than your OS level swap file.
> 
> Stefan

the bsddb module has the feature that access to the database uses the 
same methods as python dictionaries.

Sean


From odeits at gmail.com  Sat Feb 21 21:34:47 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 18:34:47 -0800 (PST)
Subject: count secton of data in list
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
	<mailman.386.1235173577.11746.python-list@python.org>
Message-ID: <3ed253bb-d6ec-4f47-af08-ad193e9c46e3@h16g2000yqj.googlegroups.com>

On Feb 20, 3:45?pm, Emile van Sebille <em... at fenx.com> wrote:
> brianrpsgt1 wrote:
>
> > def step1(val):
>
> ? ? ? ?data2_row = []
>
> > ? ? for d1r in data1_row:
> > ? ? ? ? if d1r[1] >= val:
> > ? ? ? ? ? ? switch = 0
> > ? ? ? ? ? ? data2_row = d1r[0],d1r[1],d1r[2],switch
>
> ? ? ? ? ? ? ? ?data2_row.append([d1r[0],d1r[1],d1r[2],switch])
>
> HTH,
>
> Emile

def count_consecutive(rows):
    switch = 0
    count = 0
    for r in rows:
        if r[-1] == switch:
            count += 1
        else:
            switch = not switch
            if count != 0:
                yield count
                count = 0
    if count != 0:
        yield count



rows = [
['2009-01-09','13:17:30,96',123456,0],
['2009-01-09','13:17:31,95',123456,0],
['2009-01-09','13:17:32,95',123456,0],
['2009-01-09','13:17:33,95',123456,0],
['2009-01-09','13:17:34,94',123456,1],
['2009-01-09','13:17:35,94',123456,1],
['2009-01-09','13:17:36,94',123456,1],
['2009-01-09','13:17:37,94',123456,1],
['2009-01-09','13:17:38,94',123456,1],
['2009-01-09','13:17:39,94',123456,1],
['2009-01-09','13:17:40,94',123456,1],
['2009-01-09','13:17:41,94',123456,1],
['2009-01-09','13:17:42,95',123456,0],
['2009-01-09','13:17:43,95',123456,0],
['2009-01-09','13:17:44,95',123456,0],
['2009-01-09','13:17:45,95',123456,0]
]

for cnt in count_consecutive(rows):
    print cnt


From steve at holdenweb.com  Sat Feb 21 21:46:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 21:46:27 -0500
Subject: Wanted: Online Python Course for Credit
In-Reply-To: <HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>
References: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
	<HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>
Message-ID: <gnqea4$b5l$1@ger.gmane.org>

Scott David Daniels wrote:
> jsidell wrote:
>> I'm a high school game development teacher and I have recently
>> discovered Python to be a great way to introduce computer
>> programming.  I intend to study Python on my own but I can get
>> professional development credit at my job for taking a Python course.
>> So I'm looking for an online class that I can get a certificate,
>> college credit, or something to that effect.  Any suggestions would be
>> greatly appreciated
> 
O'Reilly have commissioned me to write four on-line classes. We
anticipate that they will become available later this year through the
O'Reilly School of Technology - see http://www.oreillyschool.com/

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sat Feb 21 22:04:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 22:04:02 -0500
Subject: To unicode or not to unicode
In-Reply-To: <MPG.240a8b0f8b7d32969897c8@news.individual.de>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>	<499F0CF0.8070800@v.loewis.de>
	<gnpd8s$pm9$1@rumours.uwaterloo.ca>	<MPG.240a64495647d8329897c6@news.individual.de>	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
Message-ID: <gnqfb3$cf6$1@ger.gmane.org>

Thorsten Kampe wrote:
> * Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>> It's all about declaring your charset. In Python as well as in your
>>> newsreader. If you don't declare your charset it's ASCII for you - in
>>> Python as well as in your newsreader.
>> Except in practice unlike Python, many newsreaders don't assume ASCII.
> 
> They assume ASCII - unless you declare your charset (the exception being 
> Outlook Express and a few Windows newsreaders). Everything else is 
> "guessing".
> 
>> The original article displayed fine for me. Google Groups displays it
>> correctly too:
>>
>> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc
> 
> Your understanding of the principles of Unicode is as least as non-
> existant as the OP's.
>  
>> I could just as easily argue that assuming ISO 8859-1 is the defacto
>> standard, and that its your newsreader that's broken.
> 
> There is no "standard" in regard to guessing (this is what you call 
> "assuming"). The need for explicit declaration of an encoding is exactly 
> the same in Python as in any Usenet article.
> 
>> The reality however is that RFC 1036 is the only standard for Usenet
>> messages, defacto or otherwise, and so there's nothing wrong with
>> anyone's newsreader.
> 
> The reality is that all non-broken newsreaders use MIME headers to 
> declare and interpret the charset being used. I suggest you read at 
> least http://www.joelonsoftware.com/articles/Unicode.html to get an idea 
> of Unicode and associated topics.
> 
And I suggest you try to phrase your remarks in a way more respectful of
those you are discussing these matters with. I understand that
exasperation can lead to offensiveness, but if a lack of understanding
does exist then it's better to simply try and remove it without
commenting on its existence.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From martin at v.loewis.de  Sat Feb 21 23:21:21 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 05:21:21 +0100
Subject: To unicode or not to unicode
In-Reply-To: <eMqdncylcMt7Az3UnZ2dnUVZ_qaWnZ2d@earthlink.com>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<eMqdncylcMt7Az3UnZ2dnUVZ_qaWnZ2d@earthlink.com>
Message-ID: <49A0D2C1.5080102@v.loewis.de>

> 	Since when is "Google Groups" a newsreader? So far as I know, all
> the display/formatting is handled by my web browser and GG merely stuffs
> messages into an HTML wrapper...

It also transmits this HTML wrapper via HTTP, where it claims that the
charset of the HTML is UTF-8. To do that, it must have converted the
original message from Latin-1 to UTF-8, which must have required
interpreting it as Latin-1 in the first place.

Regards,
Martin


From peter.anderson at internode.on.net  Sat Feb 21 23:46:07 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Sun, 22 Feb 2009 15:46:07 +1100
Subject: Python 3 and easygui problem
Message-ID: <49A0D88F.4010806@internode.on.net>

I have just installed Python 3. I have been using Tkinter and easygui 
(with Python 2.5.4) for any GUI needs. I have just started to port some 
of my existing scripts to Python 3 and discovered problems with easygui.

I was using the following script for testing:

from easygui import *
import sys

while 1:
msgbox("Hello, world!")

msg ="What is your favorite flavor?"
title = "Ice Cream Survey"
choices = ["Vanilla", "Chocolate", "Strawberry", "Rocky Road"]
choice = choicebox(msg, title, choices)

# note that we convert choice to string, in case
# the user cancelled the choice, and we got None.
msgbox("You chose: " + str(choice), "Survey Result")

msg = "Do you want to continue?"
title = "Please Confirm"
if ccbox(msg, title): # show a Continue/Cancel dialog
pass # user chose Continue
else:
sys.exit(0) # user chose Cancel

I have changed the easygui source to Python 3 'import' and 'print' 
requirements and the initial message box in the above script displays 
fine fine. However the subsequent message boxes do not display and after 
the script completes I get the following error message:

---------- Python 3 ----------
Traceback (most recent call last):
File "easyguidemo.py", line 10, in
choice = choicebox(msg, title, choices)
File "C:\Python30\lib\site-packages\easygui.py", line 703, in choicebox
return __choicebox(msg,title,choices,buttons)
File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
TypeError: must use keyword argument for key function

Output completed (7 sec consumed)
------------------------------

Fixing this is a bit beyond my skills and I was wondering whether anyone 
has any thoughts.

I am happy to post a copy of my revised easygui.py script.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From clp2 at rebertia.com  Sun Feb 22 00:05:51 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 21 Feb 2009 21:05:51 -0800
Subject: Python 3 and easygui problem
In-Reply-To: <49A0D88F.4010806@internode.on.net>
References: <49A0D88F.4010806@internode.on.net>
Message-ID: <50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>

On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
<peter.anderson at internode.on.net> wrote:
> I have just installed Python 3. I have been using Tkinter and easygui (with
> Python 2.5.4) for any GUI needs. I have just started to port some of my
> existing scripts to Python 3 and discovered problems with easygui.
>
> I was using the following script for testing:
<snip>

> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
> TypeError: must use keyword argument for key function

Change the line to

choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))

Note the "key=". The calling sequence for .sort() changed in Python
3.0 to make 'key' a keyword-only argument (I think).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From rozzin at geekspace.com  Sun Feb 22 00:07:34 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 00:07:34 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
Message-ID: <87mycfqctl.fsf@slice.rozzin.com>

Ross Ridge <rridge at csclub.uwaterloo.ca> writes:
>
> > It's all about declaring your charset. In Python as well as in your 
> > newsreader. If you don't declare your charset it's ASCII for you - in 
> > Python as well as in your newsreader.
> 
> Except in practice unlike Python, many newsreaders don't assume ASCII.
> The original article displayed fine for me.

Right. Exactly.

Wasn't that exact issue a driving force behind unicode's creation in
the first place? :)

To avoid horrors like this:

   http://en.wikipedia.org/wiki/File:Letter_to_Russia_with_krokozyabry.jpg

... and people getting into arguments on usenet and having to use
rebuttals like "Well, it looked fine to *me*--there's nothing wrong,
we're just using incompatible encodings!"?

But you're right--specifying in usenet-posts is like
turn-signals....

Can we get back to Python programming, now? :)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From Graham.Dumpleton at gmail.com  Sun Feb 22 00:41:00 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 21 Feb 2009 21:41:00 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com> 
	<83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com> 
	<87tz6ns0fg.fsf@slice.rozzin.com>
Message-ID: <8477ae7b-0b0a-45c5-aba0-8df85b916fc0@l39g2000yqn.googlegroups.com>

On Feb 22, 12:52?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Graham Dumpleton <Graham.Dumple... at gmail.com> writes:
>
> > On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> > > Jesse Noller <jnol... at gmail.com> writes:
>
> > > > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > > > <Graham.Dumple... at gmail.com> wrote:
> > > > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > > > _bootstrap() doing:
>
> > > > > ?os.close(sys.stdin.fileno())
>
> > > > > rather than:
>
> > > > > ?sys.stdin.close()
>
> > > > > Technically it is feasible that stdin could have been replaced with
> > > > > something other than a file object, where the replacement doesn't have
> > > > > a fileno() method.
>
> > > > > In that sort of situation an AttributeError would be raised, which
> > > > > isn't going to be caught as either OSError or ValueError, which is all
> > > > > the code watches out for.
>
> > > > I don't know why it was implemented that way. File an issue on the
> > > > tracker and assign it to me (jnoller) please.
>
> > > My guess would be: because it's also possible for sys.stdin to be a
> > > file that's open in read+*write* mode, and for that file to have
> > > pending output buffered (for example, in the case of a socketfile).
>
> > If you are going to have a file that is writable as well as readable,
> > such as a socket, then likely that sys.stdout/sys.stderr are going to
> > be bound to it at the same time.
>
> Yes.
>
> > If that is the case then one should not be using close() at all
>
> If you mean stdin.close(), then that's what I said :)

Either. The problem is that same, it close for both read and write and
if was expecting to still be able to write because used for stdout or
stderr, then will not work.

> > as it will then also close the write side of the pipe and cause
> > errors when code subsequently attempts to write to
> > sys.stdout/sys.stderr.
>
> > In the case of socket you would actually want to use shutdown() to
> > close just the input side of the socket.
>
> Sure--but isn't this "you" the /calling/ code that set the whole thing
> up? What the /caller/ does with its stdio is up to /him/, and beyond
> the scope of the present discourse. I can appreciate a library forking
> and then using os.close() on stdio (it protects my files from any I/O
> the subprocess might think it wants to do with them), but I think I
> might be even more annoyed if it *shutdown my sockets*

Ah, yeah, forgot that shutdown does end to end shutdown rather than
just that file object reference. :-)

Graham

> than if it
> caused double-flushes (there's at least a possibility that I could
> cope with the double-flushes by just ensuring that *I* flushed before
> the fork--not so with socket.shutdown()!)
>
> > What this all means is that what is the appropriate thing to do is
> > going to depend on the environment in which the code is used. Thus,
> > having the behaviour hard wired a certain way is really bad. There
> > perhaps instead should be a way of a user providing a hook function to
> > be called to perform any case specific cleanup of stdin, stdout and
> > stderr, or otherwise reassign them.
>
> Usually, I'd say that that's what the methods on the passed-in object
> are for. Though, as I said--the file-object API is lacking, here :(
>
> > > As such, I'd recommend against just using .close(); you might use
> > > something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> > > `else' clause unconditionally calls sys.stdin.close(), then you still
> > > have double-flush problems if someone's set sys.stdin to a file-like
> > > object with output-buffering.
>
> > > I guess you could try calling that an `edge-case' and seeing if anyone
> > > screams. It'd be sort-of nice if there was finer granularity in the
> > > file API--maybe if file.close() took a boolean `flush' argument....
>
> --
> Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).



From paddy3118 at googlemail.com  Sun Feb 22 00:51:10 2009
From: paddy3118 at googlemail.com (Paddy3118)
Date: Sat, 21 Feb 2009 21:51:10 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
Message-ID: <5a2e2b9c-12d6-4606-9dff-0d7f4f9642c1@q9g2000yqc.googlegroups.com>

On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:
> Greetings, List!
>
> I was curious if anyone knew the rationale behind making midnight False?
>
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
>
> To my way of thinking, midnight does actually exist so it should be
> true. ?If datetime.time was measuring an *amount* of time, rather than a
> certain point during the day, then a time of 0:0:0 should certainly be
> False as it would mean no time had passed. ?However, since midnight does
> indeed exist (as many programmers have observed when deadlines approach
> ;) I would think it should be true.
> --
> ~Ethan~

Ethan,
Knights are true and seek the light. Evil trolls seek the night and so
their hour is false.

;-)

- Paddy.


From sbassi at clubdelarazon.org  Sun Feb 22 01:06:15 2009
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Sun, 22 Feb 2009 04:06:15 -0200
Subject: Problem trying to install ReportLab with easy_install
Message-ID: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>

I don't understand what is wrong when I try to install ReportLab. This
is under Ubuntu and all build packages are installed.
Here is what I get when trying to install it: (I could install it with
apt-get, but I am testing virtualenv and easy_install).

(testbio149)vicky at maricurie:~/Public/testbio149$ easy_install ReportLab
Searching for ReportLab
Reading http://pypi.python.org/simple/ReportLab/
Reading http://www.reportlab.com/
Best match: reportLab 2.3
Downloading http://pypi.python.org/packages/source/r/reportlab/reportLab-2.3.zip#md5=7d98b26fa287a9e4be4d35d682ce64ac
Processing reportLab-2.3.zip
Running ReportLab_2_3/setup.py -q bdist_egg --dist-dir
/tmp/easy_install-ZZcgFG/ReportLab_2_3/egg-dist-tmp-FqKULE
################################################
#Attempting install of _rl_accel, sgmlop & pyHnj
#extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel'
################################################
################################################
#Attempting install of _renderPM
#extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/renderPM'
# installing with freetype version 21
################################################
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
In function ?hex32?:
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:793:
warning: format ?%8.8X? expects type ?unsigned int?, but argument 3
has type ?long unsigned int?
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
In function ?_instanceStringWidthU?:
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1200:warning:
pointer targets in assignment differ in signedness
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?f? may be used uninitialized in this function
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?t? may be used uninitialized in this function
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?L? may be used uninitialized in this function
/usr/bin/ld: cannot find -l_renderPM_libart
collect2: ld returned 1 exit status
error: Setup script exited with error: command 'gcc' failed with exit status 1
(testbio149)vicky at maricurie:~/Public/testbio149$


From gagsl-py2 at yahoo.com.ar  Sun Feb 22 01:52:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 04:52:46 -0200
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
	<gnpbes$ics$1@ger.gmane.org>
Message-ID: <op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 14:51:40 -0200, <rdmurray at bitdance.com> escribi?:

> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
>> <aaron.hildebrandt at gmail.com> escribi=F3:
>>
>> > So, the problem lies with how Python cached the modules in memory.
>> > Yes, the modules were in two different locations and yes, the one that
>> > I specified using its direct path should be the one loaded. The
>> > problem is, the module isn't always loaded -- if it's already in
>> > memory, it'll use that instead. And since the modules had the same
>> > name, Python wouldn't distinguish between them, even though they
>> > weren't exactly the same.
>>
>> Yes, that's how import works. It's barely documented, and you finally
>> learned it the hard way...
>
> I'd argue a little bit with "barely documented".  In the reference, the
> discussion of the import statement starts off saying:
>
>     Import statements are executed in two steps: (1) find a module,
>     and initialize it if necessary; (2) define a name or names in the
>     local namespace (of the scope where the import statement occurs).
>
> The third paragraph then says:
>
>     The system maintains a table of modules that have been or are being
>     initialized, indexed by module name. This table is accessible as
>     sys.modules. When a module name is found in this table, step (1)
>     is finished.
>
> That is pretty up front and unambiguous documentation.

Sure? At a minimum, it doesn't define what "module name" means (isnt't so  
easy). It does not describe correctly how packages are handled, nor dotted  
names that aren't packages. It does not describe sys.meta_path nor  
sys.path_hooks, than can *radically* alter things. It does not describe  
absolute vs. relative imports, nor the "mix" of them in 2.x. It doesn't  
menction the *caller* module as relevant.

> However, the consequences of that statement won't be immediately clear
> on first reading.  I think it would have cleared up Aaron's confusion
> if he'd happened to think to read it.  But since he knew the syntax
> of the import statement already, I'm not surprised he did not read it.
>
> The Tutorial, in the section on modules and import, says:
>
>     A module can contain executable statements as well as function
>     definitions. These statements are intended to initialize the
>     module. They are executed only the first time the module is imported
>     somewhere.
>
> This is considerably less precise, if more superficially understandable.
> I wonder if it would be worth expanding on that statement to mention
> that the module is not even looked for on disk if a module by that
> name has already been imported.

If only that were true... Importers can do almost anything they want. The  
behaviour you describe is only what happens when a) there are no meta_path  
hooks installed, b) there are no path_hooks involved, c) __import__ has  
not been replaced, and d) you are importing a module from the filesystem.

This is what I call "barely documented".

-- 
Gabriel Genellina



From steve at pearwood.info  Sun Feb 22 01:54:41 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 22 Feb 2009 17:54:41 +1100
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
	<5a2e2b9c-12d6-4606-9dff-0d7f4f9642c1@q9g2000yqc.googlegroups.com>
Message-ID: <01b0ec24$0$20612$c3e8da3@news.astraweb.com>

Paddy3118 wrote:

> Ethan,
> Knights are true and seek the light. Evil trolls seek the night and so
> their hour is false.
> 
> ;-)

That's speciest *and* lightist. There's nothing wrong with avoiding the evil
burning day star, that's practically de rigour for programmers.


*wink*


-- 
Steven







From intelliminer at gmail.com  Sun Feb 22 02:08:32 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 23:08:32 -0800 (PST)
Subject: Python dictionary size/entry limit?
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>

On Feb 21, 6:47?pm, Stefan Behnel <stefan... at behnel.de> wrote:
> intellimi... at gmail.com wrote:
> > I wrote a script to process textual data and extract phrases from
> > them, storing these phrases in a dictionary. It encounters a
> > MemoryError when there are about 11.18M keys in the dictionary, and
> > the size is about 1.5GB.
> > [...]
> > I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> > the size or number of entries that a single dictionary can possess? By
> > searching on the web I can't find a clue why this problem occurs.
>
> Python dicts are only limited by what your OS returns as free memory.
> However, when a dict grows, it needs to resize, which means that it has to
> create a bigger copy of itself and redistribute the keys. For a dict that
> is already 1.5GB big, this can temporarily eat a lot more memory than you
> have, at least more than two times as much as the size of the dict itself.
>
> You may be better served with one of the dbm databases that come with
> Python. They live on-disk but do the usual in-memory caching. They'll
> likely perform a lot better than your OS level swap file.
>
> Stefan

Ummm, I didn't know about the dbm databases. It seems there are many
different
modules for this kind of tasks: gdbm, berkeley db, cdb, etc. I'm
needing to implement
a constant hashtable with a large number of keys, but only a small
fraction of them
will be accessed frequently, the read speed is crucial. It would be
ideal if
the implementation caches all the frequently used key/value pairs in
memory. Which
module should I use? And is there a way to specify the amount of
memory it uses for caching?
BTW, the target platform is Linux.

Thank you.


From gagsl-py2 at yahoo.com.ar  Sun Feb 22 02:20:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 05:20:31 -0200
Subject: datetime.time and midnight
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
Message-ID: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
escribi?:

> Ethan Furman wrote:
>> Greetings, List!
>>  I was curious if anyone knew the rationale behind making midnight  
>> False?
>>  --> import datetime
>> --> midnight = datetime.time(0,0,0)
>> --> bool(midnight)
>> False
>>  To my way of thinking, midnight does actually exist so it should be  
>> true.  If datetime.time was measuring an *amount* of time, rather than  
>> a certain point during the day, then a time of 0:0:0 should certainly  
>> be False as it would mean no time had passed.  However, since midnight  
>> does indeed exist (as many programmers have observed when deadlines  
>> approach ;) I would think it should be true.
>>
> I think it's because midnight is to the time of day what zero is to
> integers, or an empty string is to strings, or an empty container ...

So chr(0) should be False too...

-- 
Gabriel Genellina



From mail at microcorp.co.za  Sun Feb 22 02:29:21 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 22 Feb 2009 09:29:21 +0200
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>
	<gnpee3$r69$1@ger.gmane.org>
Message-ID: <00d501c994c8$d8eab400$0d00a8c0@hendrik>

"Christian Heimes" <lis....s.de> wrote:

> John Nagle wrote
> >    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> > really
> > dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> > it has to be converted AGAIN for 3.0.  That's a good reason to ignore
> > 2.6 as
> > defective.
> 
> Please don't call something dumb that you don't fully understand. It's
> offenses the people who have spent lots of time developing Python --
> personal, unpaid and voluntary time!

Crying out;  "Please do not criticise me, I am doing it for free!" does
not justify delivering sub standard work - that is the nature of the
open source process - if you lift your head and say or do something,
there are bound to be some objections - some thoughtful and valid,
and others merely carping.  Being sensitive about it serves no purpose.

> I can assure, the bytes alias and b'' alias have their right to exist.

This is not a helpful response - on the surface JN has a point - If
you have to go through two conversions, then 2.6 does not achieve
what it appears to set out to do.  So the issue is simple:

- do you have to convert twice?
- If yes - why? - as he says - there exists no prior code,
  so there seems to be no reason not to make it identical
  to 3.0

The response answers neither of these valid concerns.

- Hendrik



From gagsl-py2 at yahoo.com.ar  Sun Feb 22 02:34:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 05:34:02 -0200
Subject: Python 3 and easygui problem
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
Message-ID: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>

En Sun, 22 Feb 2009 03:05:51 -0200, Chris Rebert <clp2 at rebertia.com>  
escribi?:

> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
> <peter.anderson at internode.on.net> wrote:
>> I have just installed Python 3. I have been using Tkinter and easygui  
>> (with
>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>> existing scripts to Python 3 and discovered problems with easygui.
>>
>> I was using the following script for testing:
> <snip>
>
>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in  
>> __choicebox
>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive  
>> sort
>> TypeError: must use keyword argument for key function
>
> Change the line to
>
> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))
>
> Note the "key=". The calling sequence for .sort() changed in Python
> 3.0 to make 'key' a keyword-only argument (I think).

That's very short-lived; cmp is gone in 3.0.1 (should not have existed in  
3.0 in the first place).
Try with:
choices.sort(key=str.lower)

-- 
Gabriel Genellina



From mail at microcorp.co.za  Sun Feb 22 03:09:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 22 Feb 2009 10:09:39 +0200
Subject: `high overhead of multiple Python processes' (was:
	Willmultithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com><d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com><04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com><6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com><mailman.241.1235048289.11746.python-list@python.org><4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com><d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com><7x8wo2kwoz.fsf@ruckus.brouhaha.com><975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com><7x3aeadqlo.fsf@ruckus.brouhaha.com><87mycfczvd.fsf_-_@slice.rozzin.com>
	<7xfxi75tzg.fsf@ruckus.brouhaha.com>
Message-ID: <00d601c994c8$d9ee1a40$0d00a8c0@hendrik>

"Paul Rubin" <http://phr.cx at NOSPAM.invalid> wrote:

> The cost of messing with the multiprocessing module instead of having
> threads work properly, and the overhead of serializing Python data
> structures to send to another process by IPC, instead of using the
> same object in two threads.  Also, one way I often use threading is by
> sending function objects to another thread through a Queue, so the
> other thread can evaluate the function.  I don't think multiprocessing
> gives a way to serialize functions, though maybe something like it
> can be done at higher nuisance using classes.

There are also Pyro and xmlrpc and shm. - all of them more apparent
hassle than threads, and all of them better able to exploit parallelism.

That said, this has made me think the following:

<conjecture>
It is an error to pass anything but plain data between processes,
as anything else does not scale easily.

Passing plain data between processes means either serialising
the data and using channels such as pipes or sockets, or 
passing a pointer to a shared memory block through a similar
channel.

Following this leads to a clean design, while attempting to pass
higher order stuff quickly leads to convoluted code when
you try to make things operate in parallel.
<!conjecture>

The above can be crudely summed up as:

You can share and pass data, but you should not pass 
or share code between processes.

Now the above is congruent with my own experience, 
but I wonder if it is generally applicable.

- Hendrik




From w_a_x_man at yahoo.com  Sun Feb 22 03:13:11 2009
From: w_a_x_man at yahoo.com (William James)
Date: 22 Feb 2009 08:13:11 GMT
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70>
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com>
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<gktf6f$7ac$1@news.motzarella.org>
Message-ID: <gnr1en02fh6@enews2.newsguy.com>

Andr? Thieme wrote:

> (map #(map (fn [s] (Integer/parseInt s)) (.split % "\\s")) (line-seq
> (reader "blob.txt")))

An error results:

java.lang.Exception: Unable to resolve symbol: reader in this context

This works:

(map #(map (fn [s] (Integer/parseInt s)) (.split % "\\s"))
  (.split (slurp "junk") "\r?\n"))


From dickinsm at gmail.com  Sun Feb 22 04:18:21 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 22 Feb 2009 01:18:21 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
Message-ID: <0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>

On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:

> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False

I'd call this a bug.

Mark


From Ron.Barak at lsi.com  Sun Feb 22 04:37:38 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 09:37:38 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>

Hi Chris,

> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Thursday, February 19, 2009 22:58
> To: Barak, Ron
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi,
> >
> > I have a class derived from two parents (in blue below),
> which gives
> > me the following error:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
> > last):
> >   File "./failover_pickle_demo09.py", line 291, in <module>
> >     class ListControl(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> >     metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases Googling
> > suggested I should add from noconflict import classmaker and
> >
> > __metaclass__=classmaker()
> > to this class.
> >
> > However, I don't seem able to find where to get the
> noconflict module from.
> >
> > Do any of you where noconflict  could be downloaded/installed from ?
>
> From what I could google, you should in theory be able to fix
> the problem (without using any 3rd party module) by doing:
>
> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>     pass
>
> class ListControl(wx.Frame, CopyAndPaste):
>     __metaclass__ = ListControlMeta
>     #rest of class...
>
> Cheers,
> Chris

Applying your suggestion:

class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
    pass

class ListControl(wx.Frame, CopyAndPaste):
    def __init__(self, parent, id, title, list, max_list_width, log_stream, style=wx.DEFAULT_FRAME_STYLE):

        __metaclass__= ListControlMeta

        wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1), style=style)
        self.list = list
        self.log_stream = log_stream
        self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT | wx.LC_NO_HEADER)
        self.list_ctrl.InsertColumn(0, title)
        for i,line_ in enumerate(list):
            self.list_ctrl.InsertStringItem(i, line_)
                ...

I get:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 319, in <module>
    class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

So, back to trying to understand...

Thanks and bye,
Ron.
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From clp2 at rebertia.com  Sun Feb 22 04:47:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 01:47:38 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
Message-ID: <50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:37 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Chris,
>
>> -----Original Message-----
>> From: chris at rebertia.com [
> mailto:chris at rebertia.com] On
>> Behalf Of Chris Rebert
>> Sent: Thursday, February 19, 2009 22:58
>> To: Barak, Ron
>> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
>> Subject: Re: "metaclass conflict" error: where is noconflict ?
>>
>> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
>> > Hi,
>> >
>> > I have a class derived from two parents (in blue below),
>> which gives
>> > me the following error:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 291, in <module>
>> >     class ListControl(wx.Frame, CopyAndPaste):
>> > TypeError: Error when calling the metaclass bases
>> >     metaclass conflict: the metaclass of a derived class must be a
>> > (non-strict) subclass of the metaclasses of all its bases Googling
>> > suggested I should add from noconflict import classmaker and
>> >
>> > __metaclass__=classmaker()
>> > to this class.
>> >
>> > However, I don't seem able to find where to get the
>> noconflict module from.
>> >
>> > Do any of you where noconflict  could be downloaded/installed from ?
>>
>> From what I could google, you should in theory be able to fix
>> the problem (without using any 3rd party module) by doing:
>>
>> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>>     pass
>>
>> class ListControl(wx.Frame, CopyAndPaste):
>>     __metaclass__ = ListControlMeta
>>     #rest of class...
>>
>> Cheers,
>> Chris
>
> Applying your suggestion:
>
> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>     pass
>
> class ListControl(wx.Frame, CopyAndPaste):
>     def __init__(self, parent, id, title, list, max_list_width, log_stream,
> style=wx.DEFAULT_FRAME_STYLE):
>
>         __metaclass__= ListControlMeta
>
>         wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> style=style)
>         self.list = list
>         self.log_stream = log_stream
>         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
> wx.LC_NO_HEADER)
>         self.list_ctrl.InsertColumn(0, title)
>         for i,line_ in enumerate(list):
>             self.list_ctrl.InsertStringItem(i, line_)
>                 ...
>
> I get:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 319, in <module>
>     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> TypeError: Error when calling the metaclass bases
>     multiple bases have instance lay-out conflict

>From what I recall, that basically means that type(wx.Frame) and
type(CopyAndPaste) are both C classes that are are mutually
incompatible. It's basically the same reason you can't subclass from
both `list` and `dict` or two other built-in types (you get the exact
same error).

Sounds like the only way to workaround this would be to do some coding
in C or to use composition rather than inheritance for one of
ListControl's superclasses.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dickinsm at gmail.com  Sun Feb 22 04:47:54 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 22 Feb 2009 01:47:54 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org> 
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
Message-ID: <d0b9de0b-ad07-4565-87e0-6e49431f405b@l16g2000yqo.googlegroups.com>

On Feb 22, 9:18?am, Mark Dickinson <dicki... at gmail.com> wrote:
> On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> > --> midnight = datetime.time(0,0,0)
> > --> bool(midnight)
> > False
>
> I'd call this a bug.

...although looking at the source (see the function
time_nonzero in Modules/datetimemodule.c), this
behaviour is clearly intentional.  So it's not a bug;
merely a questionable design decision.  :)

Mark



From jdigital2121 at yahoo.com  Sun Feb 22 04:54:58 2009
From: jdigital2121 at yahoo.com (jeff)
Date: Sun, 22 Feb 2009 01:54:58 -0800 (PST)
Subject: ftpslib caveat solution?
Message-ID: <605090.67543.qm@web32805.mail.mud.yahoo.com>

The only python library that I am aware of that supports ftp + TLS is ftpslib, which is also included with M2Crypto. However, as stated in the README, there is one major caveat. Quote:
"""

The end-of-file marker for binary data transfers is sent by closing the
connection.  Many FTP servers close the TCP socket without shutting down the
TLS connection.  ftpslib attempts to avoid this by using the method in
test_ftpslib.py attached to Python bug 978833, overriding retrbinary to read
from the socket's makefile wrapper instead of the socket itself.  Although
this appears to work for the builtin socket.ssl and M2Crypto, it is
conceivable for a particular SSL implementation to still throw an exception in
this case, and, regardless, the issue is still exposed when using ntransfercmd
outside of retrbinary.  Note that if an exception is thrown in retrbinary, the
response from the last RETR will not be read, causing any future commands to
be one response behind.  This is especially troublesome if using passive FTP,
as the FTP class will be unable to parse the 227 response to future PASV
commands.

"""

Has anyone happened to figure out a more elegant solution to this? More specifically, the part about responses being
1 response behind when an exception is thrown, thus making this module unstable when working with a pasv FTP. Any
insight to solving this problem would be much appreciated.

Cheers,
Jeff
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From marcel.luethi at mlsystems.ch  Sun Feb 22 05:55:51 2009
From: marcel.luethi at mlsystems.ch (Marcel Luethi)
Date: Sun, 22 Feb 2009 11:55:51 +0100
Subject: Python AppStore / Marketplace
Message-ID: <46ed0da80902220255s2ce0182dl28af84dd335aa546@mail.gmail.com>

Dear Community

Now I'm standing here, having this great idea for a brand new rocking app...
But where do I start? I want it to be multi-platform (Linux, Mac OS X,
Windows). It should be easy to install and upgrade. It should be
self-contained, independent of an already installed Python. And of course -
the world should be able to find it!

So what do I do? I'm studying all the possibilities to make it
self-contained (virtualenv, InstantDjango, PortablePython...), searching for
installers (PyInstaller, EasyInstall, ...), looking into making it
executable on every platform (py2exe, py2app, cx_Freeze, ...), analyzing all
GUI frameworks (wxPython, PyGTK, PyQt, ...), investigating all hosting
providers (Google Code, SourceForge, ...) and so on and so forth.

This is not easy at all!

Using my iPhone I suddenly realize how easy it is to find applications in
Apple's AppStore. How easy and fast it is to install or de-install an app.
My iPhone even checks in the background if there is an upgrade which could
be installed painlessly.

Then I see VMware's Virtual Appliance Marketplace, where you can download
already pre-configured "appliances" for all kind of stuff. You can even
download a basic appliance, install and configure your servers and tools -
and upload it again, so that others can profit of your work.

Unfortunately there's nothing like this in the Python world...

My idea: what about having a beefed up Cheeseshop for Python apps and an
accompanying client app kind of iTunes for Python apps?

The server side could be easily implemented with any of the current web
frameworks. It's simply a management platform for the app packages
(descriptions, versions, platforms, licenses, user's comments, number of
downloads, ...) and the package files themselves.
It should be definitely hosted by the PSF I think.

The multi-platform client should be intuitively and elegantly allow app
browsing, downloading and installing those Python apps. In that respect it
is sort of a Linux package manager (Synaptic, YUM, ...). But this is only
the end-user related stuff. Furthermore it should allow to create new apps
(probably based on a previously downloaded base app), package and upload
them again (kind of Google AppEngine Launcher). Those base packages should
include some basic management framework (for installation and configuration)
and hopefully soon after the release of this platform they will be created
in a broad variety to allow app developers to choose among many
Python-version/platform/GUI/...-combinations.

IMHO an architecture like this would greatly enhance the productivity of the
whole Python community by capitalizing the knowledge of many Python
specialists. I don't have to find/install/configure all the basic stuff
myself (see above) to build my app. But I can concentrate on my app because
I'm standing on the shoulders of giants.

I believe it also would make Python as a great platform more visible to the
world - because there is only one place you have to go...


What do you think???
Is this crazy??? Or simply stupid?
Or is this the way to world domination...? ;-)


Unfortunately I'm not expert enough to build such a system - but if there is
enough interest in the community I gladly would like to help.

Marcel


PS:
Naming is important! "Python AppStore" or "Python App Marketplace" is nice -
but I would prefer something like "Python Bazaar" or "Python Souq" to
emphasize the community aspect.
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From matthew at woodcraft.me.uk  Sun Feb 22 06:23:18 2009
From: matthew at woodcraft.me.uk (Matthew Woodcraft)
Date: Sun, 22 Feb 2009 11:23:18 GMT
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net> <gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
Message-ID: <87eixq4swp.fsf@golux.woodcraft.me.uk>

"Hendrik van Rooyen" <mail at microcorp.co.za> writes:

> "Christian Heimes" <lis....s.de> wrote:
> on the surface JN has a point - If you have to go through two
> conversions, then 2.6 does not achieve what it appears to set out to
> do. So the issue is simple:

> - do you have to convert twice?
> - If yes - why? - as he says - there exists no prior code,
>   so there seems to be no reason not to make it identical
>   to 3.0

You don't have to convert twice. You don't have to use 'bytes' in 2.6 at
all. It's there in 2.6 to make some strategies for transition to 3.x
easier.

Note that 'bytes' is not (as JN asserted) a keyword, so its inclusion
won't break existing programs which were using it as an identifier.

-M-


From marcel.luethi at gmail.com  Sun Feb 22 06:24:26 2009
From: marcel.luethi at gmail.com (Marcel Luethi)
Date: Sun, 22 Feb 2009 03:24:26 -0800 (PST)
Subject: Python AppStore / Marketplace
Message-ID: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>

Dear Community

Now I'm standing here, having this great idea for a brand new rocking
app...
But where do I start? I want it to be multi-platform (Linux, Mac OS X,
Windows). It should be easy to install and upgrade. It should be self-
contained, independent of an already installed Python. And of course -
the world should be able to find it!

So what do I do? I'm studying all the possibilities to make it self-
contained (virtualenv, InstantDjango, PortablePython...), searching
for installers (PyInstaller, EasyInstall, ...), looking into making it
executable on every platform (py2exe, py2app, cx_Freeze, ...),
analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
investigating all hosting providers (Google Code, SourceForge, ...)
and so on and so forth.

This is not easy at all!

Using my iPhone I suddenly realize how easy it is to find applications
in Apple's AppStore. How easy and fast it is to install or de-install
an app. My iPhone even checks in the background if there is an upgrade
which could be installed painlessly.

Then I see VMware's Virtual Appliance Marketplace, where you can
download already pre-configured "appliances" for all kind of stuff.
You can even download a basic appliance, install and configure your
servers and tools - and upload it again, so that others can profit of
your work.

Unfortunately there's nothing like this in the Python world...

My idea: what about having a beefed up Cheeseshop for Python apps and
an accompanying client app kind of iTunes for Python apps?

The server side could be easily implemented with any of the current
web frameworks. It's simply a management platform for the app packages
(descriptions, versions, platforms, licenses, user's comments, number
of downloads, ...) and the package files themselves.
It should be definitely hosted by the PSF I think.

The multi-platform client should be intuitively and elegantly allow
app browsing, downloading and installing those Python apps. In that
respect it is sort of a Linux package manager (Synaptic, YUM, ...).
But this is only the end-user related stuff. Furthermore it should
allow to create new apps (probably based on a previously downloaded
base app), package and upload them again (kind of Google AppEngine
Launcher). Those base packages should include some basic management
framework (for installation and configuration) and hopefully soon
after the release of this platform they will be created in a broad
variety to allow app developers to choose among many Python-version/
platform/GUI/...-combinations.

IMHO an architecture like this would greatly enhance the productivity
of the whole Python community by capitalizing the knowledge of many
Python specialists. I don't have to find/install/configure all the
basic stuff myself (see above) to build my app. But I can concentrate
on my app because I'm standing on the shoulders of giants.

I believe it also would make Python as a great platform more visible
to the world - because there is only one place you have to go...


What do you think???
Is this crazy??? Or simply stupid?
Or is this the way to world domination...? ;-)


Unfortunately I'm not expert enough to build such a system - but if
there is enough interest in the community I gladly would like to help.

Marcel


PS:
Naming is important! "Python AppStore" or "Python App Marketplace" is
nice - but I would prefer something like "Python Bazaar" or "Python
Souq" to emphasize the community aspect.


From Ron.Barak at lsi.com  Sun Feb 22 06:31:01 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 11:31:01 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>

Hi Chris, 

> -----Original Message-----
> From: Chris Rebert [mailto:clp2 at rebertia.com] 
> Sent: Sunday, February 22, 2009 11:48
> To: Barak, Ron
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
> 
> On Sun, Feb 22, 2009 at 1:37 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi Chris,
> >
> >> -----Original Message-----
> >> From: chris at rebertia.com [
> > mailto:chris at rebertia.com] On
> >> Behalf Of Chris Rebert
> >> Sent: Thursday, February 19, 2009 22:58
> >> To: Barak, Ron
> >> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> >> Subject: Re: "metaclass conflict" error: where is noconflict ?
> >>
> >> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron 
> <Ron.Barak at lsi.com> wrote:
> >> > Hi,
> >> >
> >> > I have a class derived from two parents (in blue below),
> >> which gives
> >> > me the following error:
> >> >
> >> > $ python -u ./failover_pickle_demo09.py Traceback (most 
> recent call
> >> > last):
> >> >   File "./failover_pickle_demo09.py", line 291, in <module>
> >> >     class ListControl(wx.Frame, CopyAndPaste):
> >> > TypeError: Error when calling the metaclass bases
> >> >     metaclass conflict: the metaclass of a derived class 
> must be a
> >> > (non-strict) subclass of the metaclasses of all its 
> bases Googling 
> >> > suggested I should add from noconflict import classmaker and
> >> >
> >> > __metaclass__=classmaker()
> >> > to this class.
> >> >
> >> > However, I don't seem able to find where to get the
> >> noconflict module from.
> >> >
> >> > Do any of you where noconflict  could be 
> downloaded/installed from ?
> >>
> >> From what I could google, you should in theory be able to fix the 
> >> problem (without using any 3rd party module) by doing:
> >>
> >> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >>     pass
> >>
> >> class ListControl(wx.Frame, CopyAndPaste):
> >>     __metaclass__ = ListControlMeta
> >>     #rest of class...
> >>
> >> Cheers,
> >> Chris
> >
> > Applying your suggestion:
> >
> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >     pass
> >
> > class ListControl(wx.Frame, CopyAndPaste):
> >     def __init__(self, parent, id, title, list, max_list_width, 
> > log_stream,
> > style=wx.DEFAULT_FRAME_STYLE):
> >
> >         __metaclass__= ListControlMeta
> >
> >         
> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> > style=style)
> >         self.list = list
> >         self.log_stream = log_stream
> >         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
> > wx.LC_NO_HEADER)
> >         self.list_ctrl.InsertColumn(0, title)
> >         for i,line_ in enumerate(list):
> >             self.list_ctrl.InsertStringItem(i, line_)
> >                 ...
> >
> > I get:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call 
> > last):
> >   File "./failover_pickle_demo09.py", line 319, in <module>
> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> > TypeError: Error when calling the metaclass bases
> >     multiple bases have instance lay-out conflict
> 
> >From what I recall, that basically means that type(wx.Frame) and
> type(CopyAndPaste) are both C classes that are are mutually 
> incompatible. It's basically the same reason you can't 
> subclass from both `list` and `dict` or two other built-in 
> types (you get the exact same error).
> 
> Sounds like the only way to workaround this would be to do 
> some coding in C or to use composition rather than 
> inheritance for one of ListControl's superclasses.

The wx.Frame may be coded in C, but the CopyAndPaste class, which I wrote, is not (see it's listing below).
Could you have a look at the CopyAndPaste class, and see if something in its construction strikes you as susspicious ?

Thanks,
Ron.

$ cat ./CopyAndPaste.py
#!/usr/bin/env python

import wx

class CopyAndPaste():
    def __init__(self):
        pass

    def set_copy_and_paste(self):
        """
        Setting clipboard copy-and-pasting (only copying from the application to the
        clipboard is supported).
        The "menu" menu is hidded, and is only there to facilitate the acceleration table.
        Both CTRL-C and CTRL-Ins are supported.
        """
        #print line()+". set_copy_and_paste started"
        #print line()+". self.__dict__:",self.__dict__
        menu = wx.Menu()        
        copy_ = menu.Append(-1, "&Copy\tCtrl-Ins") # Copy with accelerator
        minimize_ = menu.Append(-1, "Minimize") # 
        close_ = menu.Append(-1, "Close window\tCtrl-W") # Close window
        exit_ = menu.Append(-1, "E&xit application\tCtrl-X") # Close window
        """
        #copy2_  = menu.Append(-1, "&Copy\tCtrl-C") # Copy with accelerator
        paste_  = menu.Append(-1, "&Paste\tShift-Ins") # Paste with accelerator
        paste2_  = menu.Append(-1, "&Paste\tCtrl-V") # Paste with accelerator
        """
        
        self.Bind(wx.EVT_MENU, self.on_copy, copy_)
        self.Bind(wx.EVT_MENU, self.on_minimize, minimize_)
        self.Bind(wx.EVT_MENU, self.on_close, close_)
        self.Bind(wx.EVT_MENU, self.on_exit, exit_)
        #self.Bind(wx.EVT_MENU, self.on_paste, paste_)
                  
        menuBar = wx.MenuBar()
        self.SetMenuBar(menuBar)

        acceltbl = wx.AcceleratorTable( [
                (wx.ACCEL_CTRL, ord('C'), copy_.GetId()),
                (wx.ACCEL_CTRL, ord('W'), close_.GetId()),
                (wx.ACCEL_CTRL, ord('X'), exit_.GetId()),
                (wx.ACCEL_CTRL, ord('Q'), exit_.GetId()),
                (wx.ACCEL_CTRL, wx.WXK_INSERT, copy_.GetId()),
                (wx.ACCEL_CTRL, wx.WXK_NUMPAD_INSERT, copy_.GetId()),
                #(wx.ACCEL_CTRL, ord('V'), paste_.GetId()),
                #(wx.ACCEL_SHIFT, wx.WXK_INSERT, paste_.GetId()),
            ])
        self.SetAcceleratorTable(acceltbl)

        # Setting popup menu

        self.popupmenu = menu
        self.Bind(wx.EVT_CONTEXT_MENU, self.on_show_popup)

    """    
    def on_paste(self, evt):
        wx.MessageBox("You selected 'paste'")
        """

    
    def on_show_popup(self, evt):
        pos = evt.GetPosition()
        pos = self.list_ctrl.ScreenToClient(pos)
        self.PopupMenu(self.popupmenu, pos)

    def get_data_for_clipboard(self,format="text"):
        """
        Return data ready to be copied to the clipboard.

        This is an abstract method - concrete subclasses must override this.

        Sample implementation of get_data_for_clipboard() is:

        def get_data_for_clipboard(self,format="text"):
            first_selected = self.list_ctrl.GetFirstSelected()
            selected_item_count = self.list_ctrl.GetSelectedItemCount()
            text_for_clipboard = ""
            for i in range(first_selected,first_selected+selected_item_count):
                text_for_clipboard = "%s%s\n" % (text_for_clipboard, self.list_ctrl.GetItemText(i))
            return(text_for_clipboard)   
        """
        raise NotImplementedError

    def on_copy(self, evt):
        """
        """
        text_for_clipboard = self.get_data_for_clipboard()

        data = wx.TextDataObject()
        data.SetText(text_for_clipboard)
        if wx.TheClipboard.Open():
            wx.TheClipboard.SetData(data)
            wx.TheClipboard.Close()
        else:
            wx.MessageBox("Unable to copy to the clipboard", "Error")

    def on_minimize(self, evt):
        self.Iconize()
        #self.parent.Iconize()

    def on_close(self, evt):
        self.Close()
        #self.parent.Close()

    def on_exit(self, evt):
        try:
            self.Parent.Close()
        except AttributeError:
            self.Close()

        
if __name__ == "__main__":

    app = wx.App(redirect=False)
    copy_and_paste = CopyAndPaste()
    app.MainLoop()

> 
> Cheers,
> Chris
> 
> --
> Follow the path of the Iguana...
> http://rebertia.com
> 
> 

From clp2 at rebertia.com  Sun Feb 22 06:57:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 03:57:22 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
Message-ID: <50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>

On Sun, Feb 22, 2009 at 3:31 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
<snip>
>> > Applying your suggestion:
>> >
>> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>> >     pass
>> >
>> > class ListControl(wx.Frame, CopyAndPaste):
>> >     def __init__(self, parent, id, title, list, max_list_width,
>> > log_stream,
>> > style=wx.DEFAULT_FRAME_STYLE):
>> >
>> >         __metaclass__= ListControlMeta
>> >
>> >
>> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
>> > style=style)
>> >         self.list = list
>> >         self.log_stream = log_stream
>> >         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
>> > wx.LC_NO_HEADER)
>> >         self.list_ctrl.InsertColumn(0, title)
>> >         for i,line_ in enumerate(list):
>> >             self.list_ctrl.InsertStringItem(i, line_)
>> >                 ...
>> >
>> > I get:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 319, in <module>
>> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>> > TypeError: Error when calling the metaclass bases
>> >     multiple bases have instance lay-out conflict
>>
>> >From what I recall, that basically means that type(wx.Frame) and
>> type(CopyAndPaste) are both C classes that are are mutually
>> incompatible. It's basically the same reason you can't
>> subclass from both `list` and `dict` or two other built-in
>> types (you get the exact same error).
>>
>> Sounds like the only way to workaround this would be to do
>> some coding in C or to use composition rather than
>> inheritance for one of ListControl's superclasses.
>
> The wx.Frame may be coded in C, but the CopyAndPaste class, which I wrote, is not (see it's listing below).
> Could you have a look at the CopyAndPaste class, and see if something in its construction strikes you as susspicious ?
>
> Thanks,
> Ron.
>
> $ cat ./CopyAndPaste.py
> #!/usr/bin/env python
>
> import wx
>
> class CopyAndPaste():

You need to subclass 'object' so as to make CopyAndPaste a new-style
class. This may or may not resolve the error, but you should be doing
it either way.

class CopyAndPaste(object):

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From hniksic at xemacs.org  Sun Feb 22 07:05:24 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 22 Feb 2009 13:05:24 +0100
Subject: "metaclass conflict" error: where is noconflict ?
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
Message-ID: <87k57iu16j.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> class CopyAndPaste():

CopyAndPaste is an old-style class.  Make it a new-style class, and
you'll probably be able to inherit from it and wx.Frame without
explicitly creating a new metaclass.


From peter.anderson at internode.on.net  Sun Feb 22 07:05:32 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Sun, 22 Feb 2009 23:05:32 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A13F8C.1000506@internode.on.net>

Gabriel Genellina said:

That's very short-lived; cmp is gone in 3.0.1 (should not have existed in 3.0 in the first place).
Try with:
choices.sort(key=str.lower)


Gabriel,

That's worked fine - thank you. I think I now have a version of 
easygui.py that works with Python 3, probably needs a bit more testing.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From bockman at virgilio.it  Sun Feb 22 07:53:23 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Sun, 22 Feb 2009 13:53:23 +0100
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
	<gnpeda$4tp$1@panix3.panix.com>
Message-ID: <pan.2009.02.22.12.53.23.43776@virgilio.it>

On Sat, 21 Feb 2009 09:42:02 -0800, Aahz wrote:

> In article <aac004f8-2077-4e53-a865-47c24f7f523a at t3g2000yqa.googlegroups.com>,
> Alia K  <alia_khouri at yahoo.com> wrote:
>>
>>Nevertheless, I remain curious about whether once can use the
>>contextmanager in python to achieve the full power of ruby's blocks...
> 
> Short answer: no
> 
> Longer answer: the way in Python to achieve the full power of Ruby
> blocks is to write a function.

Which was where I was aiming to with my very long-winded post :-)

Ciao
----
FB


From yanegomi at gmail.com  Sun Feb 22 08:07:57 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Sun, 22 Feb 2009 05:07:57 -0800
Subject: Problem trying to install ReportLab with easy_install
In-Reply-To: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
References: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
Message-ID: <364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>

On Sat, Feb 21, 2009 at 10:06 PM, Sebastian Bassi
<sbassi at clubdelarazon.org> wrote:
> I don't understand what is wrong when I try to install ReportLab. This
> is under Ubuntu and all build packages are installed.
> Here is what I get when trying to install it: (I could install it with
> apt-get, but I am testing virtualenv and easy_install).
>
> (testbio149)vicky at maricurie:~/Public/testbio149$ easy_install ReportLab
> Searching for ReportLab
> Reading http://pypi.python.org/simple/ReportLab/
> Reading http://www.reportlab.com/
> Best match: reportLab 2.3
> Downloading http://pypi.python.org/packages/source/r/reportlab/reportLab-2.3.zip#md5=7d98b26fa287a9e4be4d35d682ce64ac
> Processing reportLab-2.3.zip
> Running ReportLab_2_3/setup.py -q bdist_egg --dist-dir
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/egg-dist-tmp-FqKULE
> ################################################
> #Attempting install of _rl_accel, sgmlop & pyHnj
> #extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel'
> ################################################
> ################################################
> #Attempting install of _renderPM
> #extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/renderPM'
> # installing with freetype version 21
> ################################################
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
> In function ?hex32?:
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:793:
> warning: format ?%8.8X? expects type ?unsigned int?, but argument 3
> has type ?long unsigned int?
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
> In function ?_instanceStringWidthU?:
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1200:warning:
> pointer targets in assignment differ in signedness
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?f? may be used uninitialized in this function
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?t? may be used uninitialized in this function
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?L? may be used uninitialized in this function
> /usr/bin/ld: cannot find -l_renderPM_libart
> collect2: ld returned 1 exit status
> error: Setup script exited with error: command 'gcc' failed with exit status 1
> (testbio149)vicky at maricurie:~/Public/testbio149$

    It's not building lib_renderPM_libart properly, or it's a typo
that supposed to be librenderPM_libart, or bad LDFLAGS...
    More details need to be provided like an ls of your site-packages
directory and a partial ls of your local library directory (ls
/usr/?local/?lib/lib*render*libart*, etc).

Thanks,
-Garrett


From Ron.Barak at lsi.com  Sun Feb 22 08:14:28 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:14:28 +0000
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>

Hi Chris,

> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Sunday, February 22, 2009 13:57
> To: Barak, Ron
> Cc: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Sun, Feb 22, 2009 at 3:31 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> <snip>
> >> > Applying your suggestion:
> >> >
> >> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >> >     pass
> >> >
> >> > class ListControl(wx.Frame, CopyAndPaste):
> >> >     def __init__(self, parent, id, title, list, max_list_width,
> >> > log_stream,
> >> > style=wx.DEFAULT_FRAME_STYLE):
> >> >
> >> >         __metaclass__= ListControlMeta
> >> >
> >> >
> >> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> >> > style=style)
> >> >         self.list = list
> >> >         self.log_stream = log_stream
> >> >         self.list_ctrl = wx.ListCtrl(self, -1,
> style=wx.LC_REPORT |
> >> > wx.LC_NO_HEADER)
> >> >         self.list_ctrl.InsertColumn(0, title)
> >> >         for i,line_ in enumerate(list):
> >> >             self.list_ctrl.InsertStringItem(i, line_)
> >> >                 ...
> >> >
> >> > I get:
> >> >
> >> > $ python -u ./failover_pickle_demo09.py Traceback (most
> recent call
> >> > last):
> >> >   File "./failover_pickle_demo09.py", line 319, in <module>
> >> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >> > TypeError: Error when calling the metaclass bases
> >> >     multiple bases have instance lay-out conflict
> >>
> >> >From what I recall, that basically means that type(wx.Frame) and
> >> type(CopyAndPaste) are both C classes that are are mutually
> >> incompatible. It's basically the same reason you can't
> subclass from
> >> both `list` and `dict` or two other built-in types (you
> get the exact
> >> same error).
> >>
> >> Sounds like the only way to workaround this would be to do some
> >> coding in C or to use composition rather than inheritance
> for one of
> >> ListControl's superclasses.
> >
> > The wx.Frame may be coded in C, but the CopyAndPaste class,
> which I wrote, is not (see it's listing below).
> > Could you have a look at the CopyAndPaste class, and see if
> something in its construction strikes you as susspicious ?
> >
> > Thanks,
> > Ron.
> >
> > $ cat ./CopyAndPaste.py
> > #!/usr/bin/env python
> >
> > import wx
> >
> > class CopyAndPaste():
>
> You need to subclass 'object' so as to make CopyAndPaste a
> new-style class. This may or may not resolve the error, but
> you should be doing it either way.
>
> class CopyAndPaste(object):
>
> Cheers,
> Chris
>

Thanks for the super-prompt replies.

Is there a way to ask a class what its metaclasses are ?
(e.g., how to ask wx.Frame what it's metaclass is)


I'm asking, because, even subclassing from object, viz.:

class CopyAndPaste(object):
    def __init__(self):
        pass
...

Still gives me:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 321, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

Bye,
Ron.

> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From dineshbvadhia at hotmail.com  Sun Feb 22 08:17:39 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sun, 22 Feb 2009 05:17:39 -0800 (PST)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net> 
	<mailman.330.1235100133.11746.python-list@python.org>
Message-ID: <211f0ece-f29f-43c3-bd50-4c64bdee2087@j35g2000yqh.googlegroups.com>

re: "You should never have to rely on the default encoding. You should
explicitly decode and encode data."

What is the best practice for 1) doing this in Python and 2) for
unicode support ?

I want to standardize on unicode and want to put into place best
Python practice so that we don't have to worry.  Thanks!

Dinesh



On Feb 19, 7:21?pm, Benjamin Peterson <benja... at python.org> wrote:
> Ron Garret <rNOSPAMon <at> flownet.com> writes:
>
>
>
> > I'm writing a little wiki that I call ?Wiki. ?That's a lowercase Greek
> > mu at the beginning (it's pronounced micro-wiki). ?It's working, except
> > that I can't actually enter the name of the wiki into the wiki itself
> > because the default unicode encoding on my Python installation is
> > "ascii". ?So I'm trying to decide on a course of action. ?There seem to
> > be three possibilities:
>
> You should never have to rely on the default encoding. You should explicitly
> decode and encode data.
>
>
>
> > 1. ?Change the code to properly support unicode. ?Preliminary
> > investigations indicate that this is going to be a colossal pain in the
> > ass.
>
> Properly handling unicode may be painful at first, but it will surely pay off in
> the future.



From Ron.Barak at lsi.com  Sun Feb 22 08:29:10 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:29:10 +0000
Subject: How to inherit from two classes without metaclass clashing ?
In-Reply-To: <ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<mailman.289.1235077114.11746.python-list@python.org>
	<ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>

Hi Michele,

I tried understanding how to avoid the metaclasses clashing, and I did read the link you referred to below,
as well as the relevant O'Reilly cookbook chapter (Recipe 20.17. Solving Metaclass Conflicts), but seems I do not understand the correct syntax to use, as I either get

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 323, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

or

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 322, in <module>
    class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

And, mind you, all I wanted to do was inherit from two classes: wxPython's wx.Frame and my CopyAndPaste.

Namely -

I have a subclass of wxPython's wx.Frame called ListControl.
I wanted to add copy (from copy-and-paste) capabilities to this ListControl class.

I changed the header of this class to be:

class ListControl(wx.Frame, CopyAndPaste):

But, the addition of CopyAndPaste to the class parents got me into this quagmire of metaclasses.

Bye,
Ron.


> -----Original Message-----
> From: Michele Simionato [mailto:michele.simionato at gmail.com]
> Sent: Friday, February 20, 2009 07:23
> To: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Feb 19, 9:58 pm, Chris Rebert <c... at rebertia.com> wrote:
> > On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron
> <Ron.Ba... at lsi.com> wrote:
> > > Hi,
> >
> > > I have a class derived from two parents (in blue below),
> which gives
> > > me the following error:
> >
> > > $ python -u ./failover_pickle_demo09.py Traceback (most
> recent call
> > > last):
> > >   File "./failover_pickle_demo09.py", line 291, in <module>
> > >     class ListControl(wx.Frame, CopyAndPaste):
> > > TypeError: Error when calling the metaclass bases
> > >     metaclass conflict: the metaclass of a derived class must be a
> > > (non-strict) subclass of the metaclasses of all its bases
> Googling
> > > suggested I should add from noconflict import classmaker and
> >
> > > __metaclass__=classmaker()
> > > to this class.
> >
> > > However, I don't seem able to find where to get the
> noconflict module from.
> >
> > > Do any of you where noconflict  could be
> downloaded/installed from ?
>
>
> It refers to this cookbook recipe:
> http://code.activestate.com/recipes/204197/
>
> See also the printed cookbook:
>
> http://books.google.it/books?id=1Shx_VXS6ioC&pg=PA786&lpg=PA78
6&dq=python+cookbook+noconflict&source=bl&ots=BB413AZ8R7&sig=cnAB-E9rNFolHBEZQTIm_d4Mj3o&hl=it&ei=GT2eSfCtBdWa_gadppHYCw&sa=X&oi=book_result&resnum=2&ct=result#PPA786,M1

However, there is no module to download, and this is on purpose:
instead of blindly apply a "fix" one should understand what the conflict is: then it is quite easy to solve it by hand. The recipe discussion explains it all.

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From Ron.Barak at lsi.com  Sun Feb 22 08:41:20 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:41:20 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <87k57iu16j.fsf@mulj.homelinux.net>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
	<87k57iu16j.fsf@mulj.homelinux.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com>

Hi Hrvoje,

I tried also as follows:

#!/usr/bin/env python

import wx

class CopyAndPaste(object):
    def __init__(self):
        pass

    def set_copy_and_paste(self):
    ...


and CopyAndPaste is being called with:

...
class ListControlMeta(wx.Frame, CopyAndPaste):
    pass

class ListControl(wx.Frame, CopyAndPaste):

    def __init__(self, parent, id, title, list, max_list_width, log_stream, style=wx.DEFAULT_FRAME_STYLE):

        wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1), style=style)
        self.list = list
        ...

But I'm still getting:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 324, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

So, obviously the line in blue is not to Python's liking.

Bye,
Ron.

> -----Original Message-----
> From: Hrvoje Niksic [mailto:hniksic at xemacs.org]
> Sent: Sunday, February 22, 2009 14:05
> To: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
>
> > class CopyAndPaste():
>
> CopyAndPaste is an old-style class.  Make it a new-style
> class, and you'll probably be able to inherit from it and
> wx.Frame without explicitly creating a new metaclass.
>
>
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From stef.mientki at gmail.com  Sun Feb 22 08:43:23 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 22 Feb 2009 14:43:23 +0100
Subject: can error messages be improved or can they be overridden ?
Message-ID: <49A1567B.5020407@gmail.com>

hello,

I often get an error message like this

    self.Brick.Par [ self.EP[2] ]['FileName'] = filename
IndexError: list index out of range

Now it would be very welcome,
if the error message specified which index is out of range,
in this case e.g.,
- specifying the length of self.EP
- specifying the value of self.EP[2]
- specifying the length of self.Brick.Par
etc..

Is there a way to override the error message and provide this information,
or is it impossible ?

And if it's possible, am I the only one who often stumbles about this 
problem ?
(I expect many people must have bounced in this problem before me ;-)

thanks,
Stef Mientki



From steve at holdenweb.com  Sun Feb 22 09:01:43 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:01:43 -0500
Subject: Find the location of a loaded module
In-Reply-To: <op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>	<gnpbes$ics$1@ger.gmane.org>
	<op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnrls7$vgt$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Sat, 21 Feb 2009 14:51:40 -0200, <rdmurray at bitdance.com> escribi?:
> 
>> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>>> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
>>> <aaron.hildebrandt at gmail.com> escribi=F3:
>>>
>>> > So, the problem lies with how Python cached the modules in memory.
>>> > Yes, the modules were in two different locations and yes, the one that
>>> > I specified using its direct path should be the one loaded. The
>>> > problem is, the module isn't always loaded -- if it's already in
>>> > memory, it'll use that instead. And since the modules had the same
>>> > name, Python wouldn't distinguish between them, even though they
>>> > weren't exactly the same.
>>>
>>> Yes, that's how import works. It's barely documented, and you finally
>>> learned it the hard way...
>>
>> I'd argue a little bit with "barely documented".  In the reference, the
>> discussion of the import statement starts off saying:
>>
>>     Import statements are executed in two steps: (1) find a module,
>>     and initialize it if necessary; (2) define a name or names in the
>>     local namespace (of the scope where the import statement occurs).
>>
>> The third paragraph then says:
>>
>>     The system maintains a table of modules that have been or are being
>>     initialized, indexed by module name. This table is accessible as
>>     sys.modules. When a module name is found in this table, step (1)
>>     is finished.
>>
>> That is pretty up front and unambiguous documentation.
> 
> Sure? At a minimum, it doesn't define what "module name" means (isnt't
> so easy). It does not describe correctly how packages are handled, nor
> dotted names that aren't packages. It does not describe sys.meta_path
> nor sys.path_hooks, than can *radically* alter things. It does not
> describe absolute vs. relative imports, nor the "mix" of them in 2.x. It
> doesn't menction the *caller* module as relevant.
> 
>> However, the consequences of that statement won't be immediately clear
>> on first reading.  I think it would have cleared up Aaron's confusion
>> if he'd happened to think to read it.  But since he knew the syntax
>> of the import statement already, I'm not surprised he did not read it.
>>
>> The Tutorial, in the section on modules and import, says:
>>
>>     A module can contain executable statements as well as function
>>     definitions. These statements are intended to initialize the
>>     module. They are executed only the first time the module is imported
>>     somewhere.
>>
>> This is considerably less precise, if more superficially understandable.
>> I wonder if it would be worth expanding on that statement to mention
>> that the module is not even looked for on disk if a module by that
>> name has already been imported.
> 
> If only that were true... Importers can do almost anything they want.
> The behaviour you describe is only what happens when a) there are no
> meta_path hooks installed, b) there are no path_hooks involved, c)
> __import__ has not been replaced, and d) you are importing a module from
> the filesystem.
> 
> This is what I call "barely documented".
> 
Fortunately Brett Cannon has been working hard in this area, and we are
likely to see more straightforward import semantics in the near future.
In my own meanderings through the import system it did seem to me like
something that had grown organically into an arcane and impenetrable
system that was exceedingly difficult to understand.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 22 09:08:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:08:29 -0500
Subject: datetime.time and midnight
In-Reply-To: <49A083DA.7000107@stoneleaf.us>
References: <49A083DA.7000107@stoneleaf.us>
Message-ID: <gnrm8t$2e9$1@ger.gmane.org>

Ethan Furman wrote:
> Greetings, List!
> 
> I was curious if anyone knew the rationale behind making midnight False?
> 
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
> 
> To my way of thinking, midnight does actually exist so it should be
> true.  If datetime.time was measuring an *amount* of time, rather than a
> certain point during the day, then a time of 0:0:0 should certainly be
> False as it would mean no time had passed.  However, since midnight does
> indeed exist (as many programmers have observed when deadlines approach
> ;) I would think it should be true.

One might ask the rationale behind treating a time as Boolean in the
first place. Let me guess: you are retrieving the times from a database,
and you are testing of the NULL value?

If that's the case, a simple "is not None" will overcome the objection.
Though I do agree it's a little weird for bool(midnight) to return
False. Probably worth a bug report. I imagine it's just returning the
bool of the underlying integer.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 22 09:21:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:21:12 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
Message-ID: <gnrn0o$4ju$1@ger.gmane.org>

Marcel Luethi wrote:
> Dear Community
> 
> Now I'm standing here, having this great idea for a brand new rocking
> app...
> But where do I start? I want it to be multi-platform (Linux, Mac OS X,
> Windows). It should be easy to install and upgrade. It should be self-
> contained, independent of an already installed Python. And of course -
> the world should be able to find it!
> 
> So what do I do? I'm studying all the possibilities to make it self-
> contained (virtualenv, InstantDjango, PortablePython...), searching
> for installers (PyInstaller, EasyInstall, ...), looking into making it
> executable on every platform (py2exe, py2app, cx_Freeze, ...),
> analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
> investigating all hosting providers (Google Code, SourceForge, ...)
> and so on and so forth.
> 
> This is not easy at all!
> 
> Using my iPhone I suddenly realize how easy it is to find applications
> in Apple's AppStore. How easy and fast it is to install or de-install
> an app. My iPhone even checks in the background if there is an upgrade
> which could be installed painlessly.
> 
> Then I see VMware's Virtual Appliance Marketplace, where you can
> download already pre-configured "appliances" for all kind of stuff.
> You can even download a basic appliance, install and configure your
> servers and tools - and upload it again, so that others can profit of
> your work.
> 
> Unfortunately there's nothing like this in the Python world...
> 
> My idea: what about having a beefed up Cheeseshop for Python apps and
> an accompanying client app kind of iTunes for Python apps?
> 
> The server side could be easily implemented with any of the current
> web frameworks. It's simply a management platform for the app packages
> (descriptions, versions, platforms, licenses, user's comments, number
> of downloads, ...) and the package files themselves.
> It should be definitely hosted by the PSF I think.
> 
> The multi-platform client should be intuitively and elegantly allow
> app browsing, downloading and installing those Python apps. In that
> respect it is sort of a Linux package manager (Synaptic, YUM, ...).
> But this is only the end-user related stuff. Furthermore it should
> allow to create new apps (probably based on a previously downloaded
> base app), package and upload them again (kind of Google AppEngine
> Launcher). Those base packages should include some basic management
> framework (for installation and configuration) and hopefully soon
> after the release of this platform they will be created in a broad
> variety to allow app developers to choose among many Python-version/
> platform/GUI/...-combinations.
> 
> IMHO an architecture like this would greatly enhance the productivity
> of the whole Python community by capitalizing the knowledge of many
> Python specialists. I don't have to find/install/configure all the
> basic stuff myself (see above) to build my app. But I can concentrate
> on my app because I'm standing on the shoulders of giants.
> 
> I believe it also would make Python as a great platform more visible
> to the world - because there is only one place you have to go...
> 
> 
> What do you think???
> Is this crazy??? Or simply stupid?
> Or is this the way to world domination...? ;-)
> 
> 
> Unfortunately I'm not expert enough to build such a system - but if
> there is enough interest in the community I gladly would like to help.
> 
Without wishing in any way to "rain on your parade", a "beefed up
cheeseshop" isn't a new idea. When you say it should be "... simply an
management platform for the app packages" this doesn't solve any
problems at all.

And the "multiplatform client" that should "easily and elegantly allow
app browsing, downloading and installing those apps" would presumably
have to account for the many differences in package formats and install
requirements between the different platforms.

So I don't think you will find too much disagreement that this is an
excellent idea, but neither do I think you fully appreciate the
difficulties this would involve.

There have been many discussions on the python-dev list and the
distutils list about how applications should and/or could be
distributed, but so far little universal agreement on how to achieve
this nirvana of which you conceive.

> Marcel
> 
> 
> PS:
> Naming is important! "Python AppStore" or "Python App Marketplace" is
> nice - but I would prefer something like "Python Bazaar" or "Python
> Souq" to emphasize the community aspect.

Unfortunately I have no idea what a "souq" is, so I suspect this may be
linguistically biased against English speakers. Or perhaps I'm just
ignorant.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From denis.kasak at gmail.com  Sun Feb 22 09:49:25 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sun, 22 Feb 2009 15:49:25 +0100
Subject: To unicode or not to unicode
In-Reply-To: <gnq6se$n4$1@rumours.uwaterloo.ca>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
Message-ID: <39e19a010902220649u6d39eb51l9dc164e35ecc222@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:39 AM, Ross Ridge <rridge at csclub.uwaterloo.ca> wrote:
> Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
>> I understand what Unicode and MIME are for and why they exist. Neither
>> their merits nor your insults change the fact that the only current
>> standard governing the content of Usenet posts doesn't require their
>> use.
>
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>That's right. As long as you use pure ASCII you can skip this nasty step
>>of informing other people which charset you are using. If you do use non
>>ASCII then you have to do that. That's the way virtually all newsreaders
>>work. It has nothing to do with some 21+ year old RFC. Even your Google
>>Groups "newsreader" does that ('content="text/html; charset=UTF-8"').
>
> No, the original post demonstrates you don't have include MIME headers for
> ISO 8859-1 text to be properly displayed by many newsreaders.  The fact
> that your obscure newsreader didn't display it properly doesn't mean
> that original poster's newsreader is broken.

And how is this kind of assuming better than clearly stating the used
encoding? Does the fact that the last official Usenet RFC doesn't
mandate content-type headers mean that all bets are off and that we
should rely on guesswork to determine the correct encoding of a
message? No, it means the RFC is outdated and no longer suitable for
current needs.

>>Being explicit about your encoding is 99% of the whole Unicode magic in
>>Python and in any communication across the Internet (may it be NNTP,
>>SMTP or HTTP).
>
> HTTP requires the assumption of ISO 8859-1 in the absense of any
> specified encoding.

Which is, of course, completely irrelevant for this discussion. Or are
you saying that this fact should somehow obliterate the need for
specifying encodings?

>>Your Google Groups simply uses heuristics to guess the
>>encoding the OP probably used. Windows newsreaders simply use the locale
>>of the local host. That's guessing. You can call it assuming but it's
>>still guessing. There is no way you can be sure without any declaration.
>
> Newsreaders assuming ISO 8859-1 instead of ASCII doesn't make it a guess.
> It's just a different assumption, nor does making an assumption, ASCII
> or ISO 8850-1, give you any certainty.

Assuming is another way of saying "I don't know, so I'm using this
arbitrary default", which is not that different from a completely wild
guess. :-)

>>And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded
>>text doesn't fit that encoding it refuses to guess.
>
> Which is reasonable given that Python is programming language where it's
> better to have more conservative assumption about encodings so errors
> can be more quickly diagnosed.  A newsreader however is a different
> beast, where it's better to make a less conservative assumption that's
> more likely to display messages correctly to the user.  Assuming ISO
> 8859-1 in the absense of any specified encoding allows the message to be
> correctly displayed if the character set is either ISO 8859-1 or ASCII.
> Doing things the "pythonic" way and assuming ASCII only allows such
> messages to be displayed if ASCII is used.

Reading this paragraph, I've began thinking that we've misunderstood
each other. I agree that assuming ISO 8859-1 in the absence of
specification is a better guess than most (since it's more likely to
display the message correctly). However, not specifying the encoding
of a message is just asking for trouble and assuming anything is just
an attempt of cleaning someone's mess. Unfortunately, it is impossible
to detect the encoding scheme just by heuristics and with hundreds of
encodings in existence today, the only real solution to the problem is
clearly stating your content-type. Since MIME is the most accepted way
of doing this, it should be the preferred way, RFC'ed or not.

-- 
Denis Kasak


From Ron.Barak at lsi.com  Sun Feb 22 09:51:44 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 14:51:44 +0000
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A1567B.5020407@gmail.com>
References: <49A1567B.5020407@gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>

Hi Stef,

You can do something like (not tested):

try: 
	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
except IndexError,e:
                msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
                print msg
                
Bye,
Ron.
	
> -----Original Message-----
> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
> Sent: Sunday, February 22, 2009 15:43
> To: python-list at python.org
> Subject: can error messages be improved or can they be overridden ?
> 
> hello,
> 
> I often get an error message like this
> 
>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> IndexError: list index out of range
> 
> Now it would be very welcome,
> if the error message specified which index is out of range, 
> in this case e.g.,
> - specifying the length of self.EP
> - specifying the value of self.EP[2]
> - specifying the length of self.Brick.Par etc..
> 
> Is there a way to override the error message and provide this 
> information, or is it impossible ?
> 
> And if it's possible, am I the only one who often stumbles 
> about this problem ?
> (I expect many people must have bounced in this problem before me ;-)
> 
> thanks,
> Stef Mientki
> 
> 
> 

From darcy at druid.net  Sun Feb 22 10:10:19 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 22 Feb 2009 10:10:19 -0500
Subject: datetime.time and midnight
In-Reply-To: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <20090222101019.e53478c8.darcy@druid.net>

On Sun, 22 Feb 2009 05:20:31 -0200
"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
> escribi?:
> > I think it's because midnight is to the time of day what zero is to
> > integers, or an empty string is to strings, or an empty container ...
> 
> So chr(0) should be False too...

>>> chr(0)
'\x00'

That's not an empty string.  This is like...

>>> bool([0])
True

Now if Python had a char type one might expect the zero char to be
False but a collection of anything, even if the elements are False, is
not empty and hence is True.

As someone else said, there's not much point in casting time to boolean
but if you do, it is a base type, not a sequence so I wouldn't expect
to apply sequence logic to the outcome.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From tmohr at s.netic.de  Sun Feb 22 10:13:02 2009
From: tmohr at s.netic.de (Torsten Mohr)
Date: Sun, 22 Feb 2009 16:13:02 +0100
Subject: Reference or Value?
Message-ID: <gnrq68$g9h$1@news.LF.net>

Hi,

how is the rule in Python, if i pass objects to a function, when is this
done by reference and when is it by value?

def f1(a):
    a = 7

b = 3
f1(b)
print b
=> 3

Integers are obviously passed by value, lists and dicts by reference.

Is there a general rule?  Some common formulation?


Thanks for any hints,
Torsten.



From steve at holdenweb.com  Sun Feb 22 10:14:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 10:14:24 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
Message-ID: <gnrq4f$kn3$1@ger.gmane.org>

Barak, Ron wrote:
> Hi Stef,
> 
> You can do something like (not tested):
> 
> try: 
> 	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> except IndexError,e:
>                 msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
>                 print msg
>  
Unfortunately this too can raise an IndexError if self.EP has less than
three elements ...

regards
 Steve

> Bye,
> Ron.
> 	
>> -----Original Message-----
>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>> Sent: Sunday, February 22, 2009 15:43
>> To: python-list at python.org
>> Subject: can error messages be improved or can they be overridden ?
>>
>> hello,
>>
>> I often get an error message like this
>>
>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>> IndexError: list index out of range
>>
>> Now it would be very welcome,
>> if the error message specified which index is out of range, 
>> in this case e.g.,
>> - specifying the length of self.EP
>> - specifying the value of self.EP[2]
>> - specifying the length of self.Brick.Par etc..
>>
>> Is there a way to override the error message and provide this 
>> information, or is it impossible ?
>>
>> And if it's possible, am I the only one who often stumbles 
>> about this problem ?
>> (I expect many people must have bounced in this problem before me ;-)
>>
>> thanks,
>> Stef Mientki
>>
>>
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
> 


-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Sun Feb 22 10:15:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 22 Feb 2009 16:15:14 +0100
Subject: "Byte" type?
In-Reply-To: <00d501c994c8$d8eab400$0d00a8c0@hendrik>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<00d501c994c8$d8eab400$0d00a8c0@hendrik>
Message-ID: <gnrq62$lrs$1@ger.gmane.org>

Hendrik van Rooyen wrote:
> "Christian Heimes" <lis....s.de> wrote:
> 
>> John Nagle wrote
>>>    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
>>> really
>>> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
>>> it has to be converted AGAIN for 3.0.  That's a good reason to ignore
>>> 2.6 as
>>> defective.
>> Please don't call something dumb that you don't fully understand. It's
>> offenses the people who have spent lots of time developing Python --
>> personal, unpaid and voluntary time!
> 
> Crying out;  "Please do not criticise me, I am doing it for free!" does
> not justify delivering sub standard work - that is the nature of the
> open source process - if you lift your head and say or do something,
> there are bound to be some objections - some thoughtful and valid,
> and others merely carping.  Being sensitive about it serves no purpose.

There are proper and polites way to criticize somebody or something --
it's called constructive criticism -- and there are offensive ways. I
hope we can all agree that calling something dumb without good reason is
impolite.

The bytes alias does exactly what it was designed for -- and documented,
too. It just doesn't do what somebody expects it to do. Is this really
sub standard? I don't think so!

Christian



From rzantow at gmail.com  Sun Feb 22 10:21:19 2009
From: rzantow at gmail.com (rzed)
Date: Sun, 22 Feb 2009 15:21:19 +0000
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
Message-ID: <Xns9BBA69570B77Drzantowgmailcom@74.209.131.13>

Spacebar265 <spacebar265 at gmail.com> wrote in
news:c86cd530-cee5-4de6-8e19-304c664c9ca0 at c12g2000yqj.googlegroups.c
om: 

> On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid>
> wrote: 
[...]
>> >>> re.split("(\w+)", "The quick brown fox jumps, and falls
>> >>> over.")[1::2] 
>>
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls',
>> 'over'] 
> 
> Using this code how would it load each word into a temporary
> variable. 

>>> import re
>>> list_name = re.split("(\w+)", "The quick brown fox jumps, and 
falls over.")[1::2]
>>> list_name[2]
'brown'

You see, temporary variables are set. Their names are spelled 
'list_name[x]', where x is an index into the list. If your plan was 
instead to have predefined names of variables, what would they be 
called? How many would you have? With list variables, you will have 
enough, and you will know their names.

-- 
rzed


From lists at cheimes.de  Sun Feb 22 10:23:58 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 22 Feb 2009 16:23:58 +0100
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <gnrqme$mmv$1@ger.gmane.org>

Torsten Mohr schrieb:
> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
> => 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?

Python uses neither call by reference nor call by value. It's called
call by sharing or call by object. http://effbot.org/zone/call-by-object.htm

Christian



From Samnsparky at gmail.com  Sun Feb 22 10:46:30 2009
From: Samnsparky at gmail.com (Sparky)
Date: Sun, 22 Feb 2009 07:46:30 -0800 (PST)
Subject: Windows Install Command Line
Message-ID: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>

For internal distribution purposes, I was wondering if there was an
already established process/program for installing Python on Windows
machines without using an msi file or compiling from source. Basically
I need the standard distribution installed by either a batch file or
python script through py2exe.

Thank you in advance,
Sam


From duncan.booth at invalid.invalid  Sun Feb 22 10:47:16 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 22 Feb 2009 15:47:16 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <Xns9BBAA092CF55Eduncanbooth@127.0.0.1>

Torsten Mohr <tmohr at s.netic.de> wrote:

> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
>=> 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?

Yes, integers are 'obviously' passed by value, except that if they were you 
couldn't do this:

>>> x = 26*1000
>>> y = 26000
>>> id(x)==id(y)
False
>>> def whichint(arg):
	if id(arg)==id(x):
		print "You passed x"
	elif id(arg)==id(y):
		print "You passed y"

		
>>> whichint(x)
You passed x
>>> whichint(y)
You passed y


The general rule is that everything is passed in exactly the same way.


From google at mrabarnett.plus.com  Sun Feb 22 10:53:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 22 Feb 2009 15:53:59 +0000
Subject: datetime.time and midnight
In-Reply-To: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
References: <49A083DA.7000107@stoneleaf.us>	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A17517.5010307@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com> 
> escribi?:
> 
>> Ethan Furman wrote:
>>> Greetings, List!
>>>  I was curious if anyone knew the rationale behind making midnight 
>>> False?
>>>  --> import datetime
>>> --> midnight = datetime.time(0,0,0)
>>> --> bool(midnight)
>>> False
>>>  To my way of thinking, midnight does actually exist so it should be 
>>> true.  If datetime.time was measuring an *amount* of time, rather 
>>> than a certain point during the day, then a time of 0:0:0 should 
>>> certainly be False as it would mean no time had passed.  However, 
>>> since midnight does indeed exist (as many programmers have observed 
>>> when deadlines approach ;) I would think it should be true.
>>>
>> I think it's because midnight is to the time of day what zero is to
>> integers, or an empty string is to strings, or an empty container ...
> 
> So chr(0) should be False too...
> 
If that returned a character, then yes, but it returns a non-empty
string, so no. :-)


From google at mrabarnett.plus.com  Sun Feb 22 11:09:26 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 22 Feb 2009 16:09:26 +0000
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <49A178B6.1040701@mrabarnett.plus.com>

Torsten Mohr wrote:
> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
> => 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?
> 
They are all passed the same way:

def f2(a):
     a = [7]

b = [3]
f2(b)
print b
=> [3]

It's just that lists and dicts are containers whose contents you can
change (they are mutable), but integers aren't containers (they are
immutable).

Tuples are also containers, but you can't change their contents (they
are immutable).


From andrew at acooke.org  Sun Feb 22 11:37:27 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 22 Feb 2009 13:37:27 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <5b1b0ac71a7fe5a4e89092b0e8ec7c78.squirrel@acooke.dyndns.org>


as far as i understand things, the best model is:

1 - everything is an object
2 - everything is passed by reference
3 - some objects are immutable
4 - some (immutable?) objects are cached/reused by the system

andrew


Torsten Mohr wrote:
> Hi,
>
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
>
> def f1(a):
>     a = 7
>
> b = 3
> f1(b)
> print b
> => 3
>
> Integers are obviously passed by value, lists and dicts by reference.
>
> Is there a general rule?  Some common formulation?
>
>
> Thanks for any hints,
> Torsten.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From deets at nospam.web.de  Sun Feb 22 11:52:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 22 Feb 2009 17:52:16 +0100
Subject: Musings: Using decorators to reduce duplicate exception handling
In-Reply-To: <878wo4verq.fsf@agentultra.com>
References: <878wo4verq.fsf@agentultra.com>
Message-ID: <70de61Fp2e8U1@mid.uni-berlin.de>

J Kenneth King schrieb:
> I recently started a project called TracShell
> (http://code.google.com/p/tracshell) where I make heavy use of the
> xmlrpclib core module.
> 
> When the number of RPC calls was small, wrapping each call in try/except
> was acceptable. However, this obviously will duplicate code all over the
> place. There are only ever two exceptions that the module itself will
> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
> but not show stoppers.

I think the answer depends a lot on the actual error handling performed. 
If you want retries, either immediately, or with some larger prologue, 
it might make sense to abstract that away (I would have suggested the 
context-manager thing myself, but Cameron did that already).

But if you essentially want to abort in all cases, I'd just push the 
handling upwards, and rather improve the error reporting itself, e.g. by 
storing away the trace in a temporary file the user can send you.

Diez


From grante at visi.com  Sun Feb 22 11:57:17 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 22 Feb 2009 10:57:17 -0600
Subject: Unexpected long pyserial read delay on Windows
References: <49a17e2d$0$1678$742ec2ed@news.sonic.net>
Message-ID: <5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>

On 2009-02-22, John Nagle <nagle at animats.com> wrote:

> I've been using PySerial on Windows (Win2000, amusingly) to
> drive a Baudot teletype at 45.45 baud.  Input and output work,
> but there's a delay of about 1 second (!) on the input side
> between receiving a character and reporting it to the program.

The UART you're using almost certainly has a receive FIFO.
Normally, the UART doesn't interrupt the CPU to tell it there's
receeve data ready until the FIFO is almost full (eg 12 bytes
present in a 16 byte FIFO).

If the UART has an empty receive FIFO, and it receives a single
character that character goes into the receive FIFO.  If data
stops coming in before the rx FIFO threshold is reached, the
UART will wait 40 bit-times and then interrupt the CPU to tell
it there is receive data ready.

The thought is that maybe there's more data coming -- we don't
want to waste the CPU's time handling a single byte if there's
more data coming in.

At 45.45 baud, 40 bit-times is pretty close to 1 second.

If you don't want to wait 40-bit times for the rx data timeout,
then you need to disable the rx FIFO.  I'm not sure how you do
that in Windows.  I don't remember seeing anything in pyserial
to do it, but I avoid Windows as much as possible.  You might
want to go looking around in the device manager to see if
there's a checkbox "disalbe FIFO" in the serial port driver
config.

If not, then Google can probably help.

-- 
Grant



From nagle at animats.com  Sun Feb 22 12:05:20 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 22 Feb 2009 09:05:20 -0800
Subject: Unexpected long pyserial read delay on Windows
Message-ID: <49a17e2d$0$1678$742ec2ed@news.sonic.net>

    I've been using PySerial on Windows (Win2000, amusingly) to drive
a Baudot teletype at 45.45 baud.  Input and output work, but there's
a delay of about 1 second (!) on the input side between receiving a
character and reporting it to the program.

    I'm using the latest "supports 1.5 stop bits" version of PySerial
(as noted previously, this is necessary for the old mechanical Teletypes),
and opening as follows:

	ser = serial.Serial(port, baudrate=baud,
			bytesize=serial.FIVEBITS,
			parity=serial.PARITY_NONE,
			stopbits=serial.STOPBITS_ONE5,
			timeout=None)

I've tried omitting the timeout parameter, "timeout=0", and "timeout=0.1",
none of which seem to change the behavior.  The code doing the
reading is simply

while True :
     s = ser.read()				# get some input
     for ch in s:
	ser.write(ch)				# write to tty

This correctly types back what's typed in, but with a delay of about 10
character times, over 1 second. (Remember, this is a VERY slow serial
device.) There's nothing else running; CPU load is under 1%.

I've tried "ser.read(1)"; makes no difference.

The delay is on the read side; if I put in a "print", the delay occurs
before the computer prints the received character.

Is this some Windows thing?  I've looked at serialwin32.py around line 88,
and don't see any nonzero timeout parameters being fed to Windows
when "timeout=None".  Checking the Microsoft documentation, at

http://msdn.microsoft.com/en-us/library/aa363190(VS.85).aspx

feeding all zeroes into the COMMTIMEOUT structure should result in no
additional delays.

				John Nagle

	


From digitig at gmail.com  Sun Feb 22 12:09:29 2009
From: digitig at gmail.com (Tim Rowe)
Date: Sun, 22 Feb 2009 17:09:29 +0000
Subject: datetime.time and midnight
In-Reply-To: <0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
References: <mailman.427.1235256686.11746.python-list@python.org>
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
Message-ID: <aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>

2009/2/22 Mark Dickinson <dickinsm at gmail.com>:
> On Feb 21, 10:44 pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
>> --> midnight = datetime.time(0,0,0)
>> --> bool(midnight)
>> False
>
> I'd call this a bug.

No more so than zero being false. Zero exists too (check my bank
balance). Once you've accepted non-Boolean types having Boolean
values, the logic of what value they have is always going to be a bit
hairy. If you're unsure of the logic, just test against a value or a
range. After all, what value do you *expect* a time of day to have
when interpreted as a Boolean? If you don't have an expectation, why
are you interpreting it as a Boolean?


-- 
Tim Rowe


From marcel.luethi at mlsystems.ch  Sun Feb 22 12:17:23 2009
From: marcel.luethi at mlsystems.ch (Marcel Luethi)
Date: Sun, 22 Feb 2009 18:17:23 +0100
Subject: Python AppStore / Marketplace
In-Reply-To: <gnrn0o$4ju$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org>
Message-ID: <46ed0da80902220917r6bb696a6u68d67f9f8674aa28@mail.gmail.com>

Hi Steve

I really appreciate your feedback!
Certainly I'm no expert "for the many differences in package formats and
install requirements between the different platforms".

But let me explain a bit more:
I don't have the idea that the multi-platform client should handle all the
different package formats - instead it should define a new one: a simple
zip-file.
For me "self-contained, independent of an already installed Python" means
that there is a complete, isolated Python environment for each app (see
virtualenv). So Python would go into APP/lib/..., APP/bin/... and the app
itself into APP/app/... Certainly there would be also some more files like
the app icons and a description file APP/app.xml
The packaged app is a zip/gzip of the whole APP directory. Installing is
simply unpacking to a defined directory (into something like PythonApps/APP)
and setting it up as an os app.

Because there is a complete Python environment for each app (disk space and
bandwidth are cheap nowadays!) and all 3rd party libs are "integrated" there
shouldn't be any other local dependencies. So there could be APP1 with a
Python 2.5.2 + a wxPython/wxWidgets and another APP2 with Python 2.6.1 +
PyQt4.
(This is something I'm not really sure about: is it possible to setup all
binary 3rd party libs ?*.so/*.pyo/*.dll/*.pyd/...? into an isolated Python
environment?)
Of course there can't be a single APP1 for all possible platforms. But there
could be one setup for each: APP1_Linux, APP1_MacOsX10.5, APP1_WinXP
The developer has to setup/test every supported platform anyway.

The "bootstrap" (standing on the shoulders of giants) could work like this:
- first there is a base app "Python 2.5.1 for Mac OS X 10.5" built by
developer A
- next developer B creates "Django 1.0.2 for Mac OS X 10.5" based on the one
above
- then developer C integrates Pinax into B's app and creates "Pinax 0.5.1
for Mac OS X 10.5"

All those "apps" could be found in Python AppStore and a developer could
search for the one which matches his requirements best. His implementation
cost is therefore minimized.

A iTunes-like client would allow the end-user to find apps - assumed that
all (or most) developers upload their apps into the one and only Python
AppStore.
The client (there should be one for every supported platform) is a front-end
application for the (PSF-) hosted "super-cheeseshop", which end-users are
not expected to access directly.


Is my nirvana really that far away? ;-)

Best regards,
Marcel


PS
A "Souq" is an Arab market (similar to a bazaar):
http://en.wikipedia.org/wiki/Souq
I got to know one visiting one last year in Oman - and I really liked it.
But now I can see that soundex('souq') == soundex('suck').
You're right, this would be a very bad choice... ;-)




On Sun, Feb 22, 2009 at 3:21 PM, Steve Holden <steve at holdenweb.com> wrote:

> Marcel Luethi wrote:
> > Dear Community
> >
> > Now I'm standing here, having this great idea for a brand new rocking
> > app...
> > But where do I start? I want it to be multi-platform (Linux, Mac OS X,
> > Windows). It should be easy to install and upgrade. It should be self-
> > contained, independent of an already installed Python. And of course -
> > the world should be able to find it!
> >
> > So what do I do? I'm studying all the possibilities to make it self-
> > contained (virtualenv, InstantDjango, PortablePython...), searching
> > for installers (PyInstaller, EasyInstall, ...), looking into making it
> > executable on every platform (py2exe, py2app, cx_Freeze, ...),
> > analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
> > investigating all hosting providers (Google Code, SourceForge, ...)
> > and so on and so forth.
> >
> > This is not easy at all!
> >
> > Using my iPhone I suddenly realize how easy it is to find applications
> > in Apple's AppStore. How easy and fast it is to install or de-install
> > an app. My iPhone even checks in the background if there is an upgrade
> > which could be installed painlessly.
> >
> > Then I see VMware's Virtual Appliance Marketplace, where you can
> > download already pre-configured "appliances" for all kind of stuff.
> > You can even download a basic appliance, install and configure your
> > servers and tools - and upload it again, so that others can profit of
> > your work.
> >
> > Unfortunately there's nothing like this in the Python world...
> >
> > My idea: what about having a beefed up Cheeseshop for Python apps and
> > an accompanying client app kind of iTunes for Python apps?
> >
> > The server side could be easily implemented with any of the current
> > web frameworks. It's simply a management platform for the app packages
> > (descriptions, versions, platforms, licenses, user's comments, number
> > of downloads, ...) and the package files themselves.
> > It should be definitely hosted by the PSF I think.
> >
> > The multi-platform client should be intuitively and elegantly allow
> > app browsing, downloading and installing those Python apps. In that
> > respect it is sort of a Linux package manager (Synaptic, YUM, ...).
> > But this is only the end-user related stuff. Furthermore it should
> > allow to create new apps (probably based on a previously downloaded
> > base app), package and upload them again (kind of Google AppEngine
> > Launcher). Those base packages should include some basic management
> > framework (for installation and configuration) and hopefully soon
> > after the release of this platform they will be created in a broad
> > variety to allow app developers to choose among many Python-version/
> > platform/GUI/...-combinations.
> >
> > IMHO an architecture like this would greatly enhance the productivity
> > of the whole Python community by capitalizing the knowledge of many
> > Python specialists. I don't have to find/install/configure all the
> > basic stuff myself (see above) to build my app. But I can concentrate
> > on my app because I'm standing on the shoulders of giants.
> >
> > I believe it also would make Python as a great platform more visible
> > to the world - because there is only one place you have to go...
> >
> >
> > What do you think???
> > Is this crazy??? Or simply stupid?
> > Or is this the way to world domination...? ;-)
> >
> >
> > Unfortunately I'm not expert enough to build such a system - but if
> > there is enough interest in the community I gladly would like to help.
> >
> Without wishing in any way to "rain on your parade", a "beefed up
> cheeseshop" isn't a new idea. When you say it should be "... simply an
> management platform for the app packages" this doesn't solve any
> problems at all.
>
> And the "multiplatform client" that should "easily and elegantly allow
> app browsing, downloading and installing those apps" would presumably
> have to account for the many differences in package formats and install
> requirements between the different platforms.
>
> So I don't think you will find too much disagreement that this is an
> excellent idea, but neither do I think you fully appreciate the
> difficulties this would involve.
>
> There have been many discussions on the python-dev list and the
> distutils list about how applications should and/or could be
> distributed, but so far little universal agreement on how to achieve
> this nirvana of which you conceive.
>
> > Marcel
> >
> >
> > PS:
> > Naming is important! "Python AppStore" or "Python App Marketplace" is
> > nice - but I would prefer something like "Python Bazaar" or "Python
> > Souq" to emphasize the community aspect.
>
> Unfortunately I have no idea what a "souq" is, so I suspect this may be
> linguistically biased against English speakers. Or perhaps I'm just
> ignorant.
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
********************************************
MLSystems GmbH
Marcel L?thi
El.-Ing. HTL, Inf.-Ing. HTL/NDS, CNE, CNS
Betriebswirtschafts-Ing. HTL/NDS
Schwarzbachstrasse 22a
CH-3113 Rubigen / Switzerland

Tel. +41 (31) 721 83 25
Mob. +41 (79) 709 66 58
marcel.luethi at mlsystems.ch
********************************************
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From hniksic at xemacs.org  Sun Feb 22 12:44:04 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 22 Feb 2009 18:44:04 +0100
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com> (Ron
	Barak's message of "Sun\, 22 Feb 2009 13\:41\:20 +0000")
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
	<87k57iu16j.fsf@mulj.homelinux.net>
	<7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com>
Message-ID: <8763j2tli3.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> import wx
>
> class CopyAndPaste(object):
>  def __init__(self):
>   pass
>
>  def set_copy_and_paste(self):
>  ...
>
> and CopyAndPaste is being called with:
>
> ...
> class ListControlMeta(wx.Frame, CopyAndPaste):
>  pass

You don't need ListControlMeta at all; just inherit from wx.Frame and
(new-style) CopyAndPaste directly.

> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 324, in <module>
>  class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>  metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases

Are you sure you're executing the latest version where CopyAndPaste is
a new-style class?  The equivalent code works for me:

>>> import wx
>>> class CopyAndPaste(object):
...   pass
...
>>> class ListControl(wx.Frame, CopyAndPaste):
...   pass
...
>>> # no error

Could it be that you're using an older version of wx, where wx.Frame
itself is an old-style class?


From martin at v.loewis.de  Sun Feb 22 13:15:32 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 19:15:32 +0100
Subject: Windows Install Command Line
In-Reply-To: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
References: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
Message-ID: <49a19644$0$27378$9b622d9e@news.freenet.de>

Sparky wrote:
> For internal distribution purposes, I was wondering if there was an
> already established process/program for installing Python on Windows
> machines without using an msi file or compiling from source. Basically
> I need the standard distribution installed by either a batch file or
> python script through py2exe.

What's wrong with running the MSI from a batch file?

msiexec /i pythonxy.msi

If you want installation to be silent, add more command line options
to msiexec.

HTH,
Martin


From martin at v.loewis.de  Sun Feb 22 13:38:10 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 19:38:10 +0100
Subject: "Byte" type?
In-Reply-To: <mailman.439.1235292478.11746.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
Message-ID: <49A19B92.2080102@v.loewis.de>

>> Please don't call something dumb that you don't fully understand. It's
>> offenses the people who have spent lots of time developing Python --
>> personal, unpaid and voluntary time!
> 
> Crying out;  "Please do not criticise me, I am doing it for free!" does
> not justify delivering sub standard work - that is the nature of the
> open source process - if you lift your head and say or do something,
> there are bound to be some objections - some thoughtful and valid,
> and others merely carping.  Being sensitive about it serves no purpose.

Still, John *clearly* doesn't understand what he observes, so asking him
not to draw conclusions until he does understand is not defending
against criticism.

> This is not a helpful response - on the surface JN has a point - If
> you have to go through two conversions, then 2.6 does not achieve
> what it appears to set out to do.  So the issue is simple:
> 
> - do you have to convert twice?

Depends on how you write your code. If you use the bytearray type
(which John didn't, despite his apparent believe that he did),
then no conversion additional conversion is needed.

Likewise, if you only use byte (not bytearray) literals, without
accessing individual bytes (e.g. if you only ever read and write
them, or pass them to the struct module), 2to3 will do the right
thing.

> - If yes - why? - as he says - there exists no prior code,
>   so there seems to be no reason not to make it identical
>   to 3.0

Sure there is. Making the bytes type and the str type identical
in 2.x gives the easiest way of porting. Adding bytes as a separate
type would have complicated a lot of things.

Regards,
Martin


From nagle at animats.com  Sun Feb 22 13:38:11 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 22 Feb 2009 10:38:11 -0800
Subject: Unexpected long pyserial read delay on Windows
In-Reply-To: <5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>
References: <49a17e2d$0$1678$742ec2ed@news.sonic.net>
	<5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>
Message-ID: <49a193c7$0$1581$742ec2ed@news.sonic.net>

Grant Edwards wrote:
> On 2009-02-22, John Nagle <nagle at animats.com> wrote:
> 
>> I've been using PySerial on Windows (Win2000, amusingly) to
>> drive a Baudot teletype at 45.45 baud.  Input and output work,
>> but there's a delay of about 1 second (!) on the input side
>> between receiving a character and reporting it to the program.
> 
> The UART you're using almost certainly has a receive FIFO.
> Normally, the UART doesn't interrupt the CPU to tell it there's
> receeve data ready until the FIFO is almost full (eg 12 bytes
> present in a 16 byte FIFO).
> 
> If the UART has an empty receive FIFO, and it receives a single
> character that character goes into the receive FIFO.  If data
> stops coming in before the rx FIFO threshold is reached, the
> UART will wait 40 bit-times...

    Ah, 40 bit times.  That's the default.  And that's the problem.
I thought the accumulation timer was a fixed timer of a few milliseconds.

    There is a "disable FIFO" checkbox in Windows 2000. It's hard to
find.

	- Log off as user.
	- Log on as "administrator"
	- Open Control Panel -> System
	- Go to "Devices" tab and select "Device manager".
	- Open "Ports" in the tree and click on desired COM1 port.
	- Click "Advanced" button.
	- Set "Receive buffer size" slider to 1.
	- Click "Disable FIFO" checkbox.
	- Close all the dialogs.
	- Reboot. (Yes, it doesn't take effect until the next reboot.)

That fixed the problem.  Thanks.

					John Nagle


From ark at acm.org  Sun Feb 22 13:39:01 2009
From: ark at acm.org (Andrew Koenig)
Date: Sun, 22 Feb 2009 18:39:01 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
Message-ID: <9Zgol.34884$4m1.18711@bgtnsc05-news.ops.worldnet.att.net>

"andrew cooke" <andrew at acooke.org> wrote in message 
news:mailman.464.1235320654.11746.python-list at python.org...

> as far as i understand things, the best model is:
>
> 1 - everything is an object
> 2 - everything is passed by reference
> 3 - some objects are immutable
> 4 - some (immutable?) objects are cached/reused by the system

0 - Assignment rebinds the reference on its left-hand side; it does not 
change the object to which that reference refers.

Example:

    x = 42
    y = x

Now x and y are bound to the same object

    x = x + 1

This statement computes the value of x + 1, which is a new object with value 
43.  It then rebinds x to refer to this object, so x and y now refer to 
different objects.  Therefore:

    def f(a):
        a = a + 1
    x = 42
    f(x)

This example behaves analogously to the previous one: The assignment a = a + 
1 binds a to a new object, so it does not affect the object to which x is 
bound.

    z = [3]
    y = z
    z[0] = z[0] + 1

The assignment rebinds z[0] to refer to a new object that has the value 4. 
This rebinding does not affect the object formerly bound to z[0].  It does, 
however, affect the value of the object to which z is bound, because it 
changes the value of its list element.  By analogy:

    def g(b):
        b[0] = b[0] + 1
    w = [42]
    g(w)

Now w[0] will be 43.




From stefan_ml at behnel.de  Sun Feb 22 14:21:51 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 22 Feb 2009 20:21:51 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
	<006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>
Message-ID: <49a1a5d0$0$31340$9b4e6d93@newsspool4.arcor-online.net>

intelliminer at gmail.com wrote:
> Ummm, I didn't know about the dbm databases. It seems there are many
> different
> modules for this kind of tasks: gdbm, berkeley db, cdb, etc. I'm
> needing to implement
> a constant hashtable with a large number of keys, but only a small
> fraction of them
> will be accessed frequently, the read speed is crucial. It would be
> ideal if
> the implementation caches all the frequently used key/value pairs in
> memory. Which
> module should I use? And is there a way to specify the amount of
> memory it uses for caching?
> BTW, the target platform is Linux.

Their interfaces are mostly compatible to Python dicts. Just keep your code
independent at the beginning and benchmark it against all of them.

Stefan


From ra.ravi.rav at gmail.com  Sun Feb 22 14:44:50 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Sun, 22 Feb 2009 11:44:50 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
Message-ID: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>

The following code didn't work:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)


However the following did:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, **kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)



Please explain


From tim.wintle at teamrubber.com  Sun Feb 22 14:52:13 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Sun, 22 Feb 2009 19:52:13 +0000
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <1235332334.32144.4.camel@tim-laptop>

On Sun, 2009-02-22 at 11:44 -0800, Ravi wrote:
> The following code didn't work:
> 
<snip>
>         def g(self, s, kwds):
>                 print s
>                 print kwds

This expects the function g to be called with the parameters "s" and
"kwds"

<snip>
>         def g(self, s, **kwds):
>                 print s
>                 print kwds

This expects to be passed the parameter "s", and various keyword
arguments, which will be put into the dict "kwds".

when you call 

o.g("string",**kwds)

you are passing the parameter "string" as the first parameter, and then
a sequence of keyword arguments taken from kwds, which will be passed
separately.

This is what the second form expects, but not what the first one
expects.

Tim Wintle




From ra.ravi.rav at gmail.com  Sun Feb 22 15:09:26 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Sun, 22 Feb 2009 12:09:26 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.468.1235332348.11746.python-list@python.org>
Message-ID: <2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>

I am sorry about the typo mistake, well the code snippets are as:

# Non Working:

class X(object):
  def f(self, **kwds):
  print kwds
  try:
    print kwds['i'] * 2
  except KeyError:
    print "unknown keyword argument"
    self.g("string", kwds)

  def g(self, s, **kwds):
    print s
    print kwds

if __name__ == "__main__":
x = X()
x.f(k = 2, j = 10)


# Working One

class X(object):
  def f(self, **kwds):
    print kwds
    try:
      print kwds['i'] * 2
    except KeyError:
     print "unknown keyword argument"
   self.g("string", **kwds)

def g(self, s, **kwds):
  print s
  print kwds

if __name__ == "__main__":
x = X()
x.f(k = 2, j = 10)


From marduk at letterboxes.org  Sun Feb 22 15:09:38 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 15:09:38 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <1235333378.17589.6.camel@centar.nbk>

On Sun, 2009-02-22 at 11:44 -0800, Ravi wrote:
> The following code didn't work:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
                                   ^^^^^^

This means call g() with kwds passed as keyword arguments.

>         def g(self, s, kwds):

The method signature is not expecting keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
> 
> However the following did:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
> 
>         def g(self, s, **kwds):
                         ^^^^^^
The method signature expects (optionally) keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
> 




From Samnsparky at gmail.com  Sun Feb 22 15:10:59 2009
From: Samnsparky at gmail.com (Sparky)
Date: Sun, 22 Feb 2009 12:10:59 -0800 (PST)
Subject: Windows Install Command Line
References: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
	<49a19644$0$27378$9b622d9e@news.freenet.de>
Message-ID: <5e645c6d-8707-4f6b-abd1-798e3802df32@u38g2000yqe.googlegroups.com>

On Feb 22, 11:15?am, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> Sparky wrote:
> > For internal distribution purposes, I was wondering if there was an
> > already established process/program for installing Python on Windows
> > machines without using an msi file or compiling from source. Basically
> > I need the standard distribution installed by either a batch file or
> > python script through py2exe.
>
> What's wrong with running the MSI from a batch file?
>
> msiexec /i pythonxy.msi
>
> If you want installation to be silent, add more command line options
> to msiexec.
>
> HTH,
> Martin

Ah! Wonderful that was exactly what I was looking for.

Thanks,
Sam


From martin at v.loewis.de  Sun Feb 22 15:11:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 21:11:41 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <49a1b17d$0$28748$9b622d9e@news.freenet.de>

intelliminer at gmail.com wrote:
> Is there a limit to the size or number of entries that a single 
> dictionary can possess?

On a 32-bit system, the dictionary can have up to 2**31 slots,
meaning that the maximum number of keys is slightly smaller
(about 2**30).

As others have pointed out, Python's or Windows' memory management
might have led to fragmentation, so that no contiguous piece of
memory to hold the resized dictionary can be found.

One solution to that problem would be to use a 64-bit system.

Regards,
Martin



From clp2 at rebertia.com  Sun Feb 22 15:11:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 12:11:59 -0800
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
Message-ID: <50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>

On Sun, Feb 22, 2009 at 5:14 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Chris,
<snip
> Is there a way to ask a class what its metaclasses are ?
> (e.g., how to ask wx.Frame what it's metaclass is)

Of course. A metaclass is the type of a class, so it's just type(wx.Frame).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com

>
> I'm asking, because, even subclassing from object, viz.:
>
> class CopyAndPaste(object):
>     def __init__(self):
>         pass
> ...
>
> Still gives me:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 321, in <module>
>     class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
>
> Bye,
> Ron.


From marduk at letterboxes.org  Sun Feb 22 15:32:23 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 15:32:23 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.468.1235332348.11746.python-list@python.org>
	<2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>
Message-ID: <1235334743.17589.15.camel@centar.nbk>

On Sun, 2009-02-22 at 12:09 -0800, Ravi wrote:
> I am sorry about the typo mistake, well the code snippets are as:
> 
> # Non Working:
> 
> class X(object):
>   def f(self, **kwds):
>   print kwds
>   try:
>     print kwds['i'] * 2
>   except KeyError:
>     print "unknown keyword argument"
>     self.g("string", kwds)
> 
>   def g(self, s, **kwds):
>     print s
>     print kwds
> 
> if __name__ == "__main__":
> x = X()
> x.f(k = 2, j = 10)
> 
> 
> # Working One
> 
> class X(object):
>   def f(self, **kwds):
>     print kwds
>     try:
>       print kwds['i'] * 2
>     except KeyError:
>      print "unknown keyword argument"
>    self.g("string", **kwds)
> 
> def g(self, s, **kwds):
>   print s
>   print kwds
> 
> if __name__ == "__main__":
> x = X()
> x.f(k = 2, j = 10)

Same reasoning, though admittedly the error text is misleading.

This example can be simplified as:

def foo(x, **kwargs):
    pass

>>> foo(1, {'boys': 5, 'girls': 10}) 
==> TypeError: foo() takes exactly 1 argument (2 given)

Again misleading, but the argument is the same (no pun intended).

However the following would have worked:

>>> foo(1, **{'boys': 5, 'girls': 10})

or 

>>> foo(1, boys=5, girls=10)



From desas2 at gmail.com  Sun Feb 22 16:03:03 2009
From: desas2 at gmail.com (desas2 at gmail.com)
Date: Sun, 22 Feb 2009 13:03:03 -0800 (PST)
Subject: Problem with lists.
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <172d73c1-58e3-443b-81e7-15052092308e@f3g2000yqf.googlegroups.com>

On Feb 20, 10:12?am, "ssd" <c... at d.com> wrote:
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values ?b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
> ? ? for j in range (0,5):
> ? ? ? ? a[0] = i
> ? ? ? ? a[1] = j
> ? ? ? ? print "a: " + str(a)
> ? ? ? ? b.append(a)
>
> print "b: " + str(b)
>
> what is worng in the code?
>
> Thanks,
> Bye,

This is what I did and gives your expected results. I am sure, there
may be better way of doing it.
a = []
b =[]
for i in range(0,5):
    for j in range(0,5):
        a.append(i)
        a.append(j)
        b.append(a)
        a =[]
print b

output:
[[0, 0], [0, 1], [0, 2], [0, 3], [0, 4], [1, 0], [1, 1], [1, 2], [1,
3], [1, 4],
 [2, 0], [2, 1], [2, 2], [2, 3], [2, 4], [3, 0], [3, 1], [3, 2], [3,
3], [3, 4],
 [4, 0], [4, 1], [4, 2], [4, 3], [4, 4]]

HTH
Dinakar


From rozzin at geekspace.com  Sun Feb 22 16:06:35 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 16:06:35 -0500
Subject: datetime.time and midnight
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
	<mailman.457.1235315429.11746.python-list@python.org>
Message-ID: <8763j2qizo.fsf@slice.rozzin.com>

"D'Arcy J.M. Cain" <darcy at druid.net> writes:
>
> On Sun, 22 Feb 2009 05:20:31 -0200
> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> > En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
> > escribi?:
> > > I think it's because midnight is to the time of day what zero is to
> > > integers, or an empty string is to strings, or an empty container ...
> > 
> > So chr(0) should be False too...
> 
> >>> chr(0)
> '\x00'
> 
> That's not an empty string.  This is like...
> 
> >>> bool([0])
> True
> 
> Now if Python had a char type one might expect the zero char to be
> False but a collection of anything, even if the elements are False, is
> not empty and hence is True.

And, as Halmos said:

   A box that contains a hat and nothing else is not the same thing as
   a hat....

:)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From clp2 at rebertia.com  Sun Feb 22 16:11:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 13:11:55 -0800
Subject: Problem with lists.
In-Reply-To: <gnsdo4$mvc$2@aioe.org>
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <50697b2c0902221311s3eca7d6y396c6abb3f959879@mail.gmail.com>

On Fri, Feb 20, 2009 at 8:12 AM, ssd <cdsd at d.com> wrote:
>
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values  b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
>    for j in range (0,5):
>        a[0] = i
>        a[1] = j
>        print "a: " + str(a)
>        b.append(a)

.append() does NOT copy the list `a`, it appends a /reference/ to `a`
(so to speak); thus, when you change `a` on the next iteration, you
change the same list *all* the entries in `b` point to.

Here's a corrected version:

b =[]
for i in range(0,5):
    for j in range(0,5):
        a = [i, j]
        b.append(a)
print b

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tjreedy at udel.edu  Sun Feb 22 16:18:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:18:39 -0500
Subject: Python 3 and easygui problem
In-Reply-To: <49A13F8C.1000506@internode.on.net>
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
	<49A13F8C.1000506@internode.on.net>
Message-ID: <gnsffd$ne6$1@ger.gmane.org>

Peter Anderson wrote:
> Gabriel Genellina said:
> 
> That's very short-lived; cmp is gone in 3.0.1 (should not have existed 
> in 3.0 in the first place).
> Try with:
> choices.sort(key=str.lower)
> 
> 
> Gabriel,
> 
> That's worked fine - thank you. I think I now have a version of 
> easygui.py that works with Python 3, probably needs a bit more testing.

Can you please make it available thru PyPI?



From tjreedy at udel.edu  Sun Feb 22 16:20:13 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:20:13 -0500
Subject: Python 3 and easygui problem
In-Reply-To: <50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
Message-ID: <gnsfic$ne6$2@ger.gmane.org>

Chris Rebert wrote:
> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
> <peter.anderson at internode.on.net> wrote:
>> I have just installed Python 3. I have been using Tkinter and easygui (with
>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>> existing scripts to Python 3 and discovered problems with easygui.
>>
>> I was using the following script for testing:
> <snip>
> 
>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
>> TypeError: must use keyword argument for key function
> 
> Change the line to
> 
> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))

The key function must take one arg, not two, as with Gabriel's solution: 
str.lower.



From ethan at stoneleaf.us  Sun Feb 22 16:20:59 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 22 Feb 2009 13:20:59 -0800
Subject: datetime.time and midnight
In-Reply-To: <aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
References: <mailman.427.1235256686.11746.python-list@python.org>	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
	<aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
Message-ID: <49A1C1BB.5070506@stoneleaf.us>

Tim Rowe wrote:
> 2009/2/22 Mark Dickinson <dickinsm at gmail.com>:
>   
>> On Feb 21, 10:44 pm, Ethan Furman <et... at stoneleaf.us> wrote:
>>
>>     
>>> --> midnight = datetime.time(0,0,0)
>>> --> bool(midnight)
>>> False
>>>       
>> I'd call this a bug.
>>     
>
> No more so than zero being false. Zero exists too (check my bank
> balance). Once you've accepted non-Boolean types having Boolean
> values, the logic of what value they have is always going to be a bit
> hairy. If you're unsure of the logic, just test against a value or a
> range. After all, what value do you *expect* a time of day to have
> when interpreted as a Boolean? If you don't have an expectation, why
> are you interpreting it as a Boolean?
>
>   
As Steve Holden correctly guessed, my use case is with databases (more 
accurately, with dBase and VFP dbf files).  As I was creating a dbf 
date/datetime/time wrapper for the existing datetime data types I 
noticed that it is *not* possible to have a false date, nor a false 
date/time, so I was surprised with the false time.

So partly because of dates and datetimes, partly because objects are 
true unless special effort is made to have them be false, and partly 
because midnight is in fact a time of day, and not a lack of a time of 
day, I do indeed expect it to be True.
--
~Ethan~


From mccredie at gmail.com  Sun Feb 22 16:23:47 2009
From: mccredie at gmail.com (Matimus)
Date: Sun, 22 Feb 2009 13:23:47 -0800 (PST)
Subject: Problem with lists.
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <dc650824-f2f9-4bfc-9750-3cdf22cd0f0d@f20g2000yqg.googlegroups.com>

On Feb 20, 8:12?am, "ssd" <c... at d.com> wrote:
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values ?b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
> ? ? for j in range (0,5):
> ? ? ? ? a[0] = i
> ? ? ? ? a[1] = j
> ? ? ? ? print "a: " + str(a)
> ? ? ? ? b.append(a)
>
> print "b: " + str(b)
>
> what is worng in the code?
>
> Thanks,
> Bye,

The problem is that `a' is the name of a list object. When you change
the contents of that list object you are simply mutating that object.
You then append that list object to list `b'. But, you aren't creating
a new list, you are simply mutating the same list object over and over
and appending it to list `b'. So list `b' contains 5 references to the
same object.

A couple of things I would do differently. There is no reason to
declare `a' outside of the loop. This isn't C you don't have to
declare your variables before they are needed. `range(0, 5)' is
usually just written `range(5)'. Also, check out  `xrange'.


Here are a couple of examples of alternatives:

construct new lists and append them in the inner loop:

b = []
for i in range(5):
    for j in range(5):
        b.append([i, j])
print b


check out list comprehension:

b = [[i, j] for i in range(5) for j in range(5)]
print b


Matt


From tjreedy at udel.edu  Sun Feb 22 16:28:48 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:28:48 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <gnsg2f$ne6$3@ger.gmane.org>

Ravi wrote:
> The following code didn't work:

In the future, explain "didn't work".
Wrong output? give actual (copy and paste) and expected.
Error message? give traceback (copy and paste).



From clp2 at rebertia.com  Sun Feb 22 16:41:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 13:41:39 -0800
Subject: Python 3 and easygui problem
In-Reply-To: <gnsfic$ne6$2@ger.gmane.org>
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
	<gnsfic$ne6$2@ger.gmane.org>
Message-ID: <50697b2c0902221341n18ff4926y739017c912e31412@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:20 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> Chris Rebert wrote:
>>
>> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
>> <peter.anderson at internode.on.net> wrote:
>>>
>>> I have just installed Python 3. I have been using Tkinter and easygui
>>> (with
>>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>>> existing scripts to Python 3 and discovered problems with easygui.
>>>
>>> I was using the following script for testing:
>>
>> <snip>
>>
>>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
>>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive
>>> sort
>>> TypeError: must use keyword argument for key function
>>
>> Change the line to
>>
>> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))
>
> The key function must take one arg, not two, as with Gabriel's solution:
> str.lower.

Yeah, I was too quick on the trigger and mixed up key and cmp.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dineshbvadhia at hotmail.com  Sun Feb 22 16:47:22 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sun, 22 Feb 2009 13:47:22 -0800 (PST)
Subject: Python on 64-bit Windows Vista
Message-ID: <7bb9f5c5-400c-4ae0-86f4-ecc589d083ed@a12g2000yqm.googlegroups.com>

Does anyone have experience of working with Python and very large text
files (> 10Gb) on 64-bit Windows Vista?

The problem is that my Python program - to perform simple data
processing on the 10Gb file - never completes and ends with an error.
When I reduce the size of the file (< 5Gb) the program works
perfectly.  So, it is not my code!

This is not the first time that this has happened and I'm wondering
what is it about Python and/or 64-bit Vista that causes these
inexplicable errors when processing very large text files?

Dinesh


From sjmachin at lexicon.net  Sun Feb 22 16:58:21 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 13:58:21 -0800 (PST)
Subject: Python 3 and easygui problem
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
	<49A13F8C.1000506@internode.on.net> 
	<mailman.473.1235337532.11746.python-list@python.org>
Message-ID: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>

On Feb 23, 8:18?am, Terry Reedy <tjre... at udel.edu> wrote:
> Peter Anderson wrote:
> > Gabriel Genellina said:
>
> > That's very short-lived; cmp is gone in 3.0.1 (should not have existed
> > in 3.0 in the first place).
> > Try with:
> > choices.sort(key=str.lower)
>
> > Gabriel,
>
> > That's worked fine - thank you. I think I now have a version of
> > easygui.py that works with Python 3, probably needs a bit more testing.
>
> Can you please make it available thru PyPI?

Are you 100% certain that easygui is not being maintained any more? If
so, it's rather sudden; the latest released version is "version 0.85
(2009-01-16)" ... see
 http://easygui.sourceforge.net/download/easygui_v0.85.html

Did you mistake the OP for the author/maintainer??

Has the OP tried to contact the author/maintainer of easygui [the
usually-recommended approach to problems with not-widely-used third-
party modules]?

Don't you think the author/maintainer might like to be consulted
before you incite an OP to claim-jump his package name on PyPI?


From peke at iki.fi  Sun Feb 22 17:10:58 2009
From: peke at iki.fi (=?ISO-8859-1?Q?Pekka_Kl=E4rck?=)
Date: Mon, 23 Feb 2009 00:10:58 +0200
Subject: Find the location of a loaded module
In-Reply-To: <op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <7dedbb6d0902221410l68c9e174h5cdd9beebc1fb42@mail.gmail.com>

2009/2/21 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
>
> Use packages. Make act1 and act2 packages by creating __init__.py files.

That's how I'd do it too. The code would be also more easy to
understand and maintain:

import act1
import act2

act1.story()
act2.story()


Alternative solution would be using reload function after changing sys.path.

Cheers,
    .peke


From peter.anderson at internode.on.net  Sun Feb 22 17:17:03 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 09:17:03 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
References: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
Message-ID: <49A1CEDF.7020609@internode.on.net>

John Machin said:

Has the OP tried to contact the author/maintainer of easygui [the
usually-recommended approach to problems with not-widely-used third-
party modules]?

Don't you think the author/maintainer might like to be consulted
before you incite an OP to claim-jump his package name on PyPI?

The OP (I presume you mean me) has tried to contact Steve Ferg (the 
original developer) but I have not had a reply yet. See my e-mail above; 
it is NOT my intention to place my modified script on PyPI as I AM NOT 
the original developer. My claim to fame is changing a few "import" and 
"print" statements and getting some useful advice from other members of 
this list.

I am happy to make my modified script available unofficially and if 
Steve does contact me I would prefer to pass it on to him for his 
consideration.

This little project started out to solve a personal need not to 
plagiarise or usurp the rights and skills of another developer. I was 
happy to make my simple effort available, unofficially, in return for 
help from other list members.

I hope that resolves the issue.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From peter.anderson at internode.on.net  Sun Feb 22 17:58:06 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 09:58:06 +1100
Subject: Python 3 and easygui problem
Message-ID: <49A1D87E.4050805@internode.on.net>

Terry,

I have not used PyPI before and feel a little uneasy about putting this 
modified script into such a public place. I have previously contacted 
Steve Ferg (the original developer of EasyGui) but have not had a reply. 
Clearly the bulk of the work is his still where as the modifications are 
mine (and several helpers from the Python List).

Until I work out what I ought to do I have attached a copy of my script 
(and the test script I have been using) as is. I would really appreciate 
any comments. If Steve does not reply and further testing proves my 
modified script is sound then I will certainly look at a 'public' release.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6



From sjmachin at lexicon.net  Sun Feb 22 18:24:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 15:24:10 -0800 (PST)
Subject: Python 3 and easygui problem
References: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
	<mailman.479.1235341034.11746.python-list@python.org>
Message-ID: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>

On Feb 23, 9:17?am, Peter Anderson <peter.ander... at internode.on.net>
wrote:
> John Machin said:
>
> Has the OP tried to contact the author/maintainer of easygui [the
> usually-recommended approach to problems with not-widely-used third-
> party modules]?
>
> Don't you think the author/maintainer might like to be consulted
> before you incite an OP to claim-jump his package name on PyPI?
>
> The OP (I presume you mean me) has tried to contact Steve Ferg (the
> original developer) but I have not had a reply yet. See my e-mail above;
> it is NOT my intention to place my modified script on PyPI as I AM NOT
> the original developer. My claim to fame is changing a few "import" and
> "print" statements and getting some useful advice from other members of
> this list.
>
> I am happy to make my modified script available unofficially and if
> Steve does contact me I would prefer to pass it on to him for his
> consideration.
>
> This little project started out to solve a personal need not to
> plagiarise or usurp the rights and skills of another developer. I was
> happy to make my simple effort available, unofficially, in return for
> help from other list members.
>
> I hope that resolves the issue.

Thank you, but your intentions stated above are just fine and what I
presumed. The issue is not with you but with Terry suggesting that you
should "make it available thru PyPI" with no qualification or caveat
at all -- the knowledge that you had attempted to contact Steve Ferg
and have not yet had a response was not available on c.l.py and in any
case is not a justification for incitement to hijack.


From james.m.pearson at gmail.com  Sun Feb 22 19:15:40 2009
From: james.m.pearson at gmail.com (James Pearson)
Date: Sun, 22 Feb 2009 16:15:40 -0800
Subject: pickle.load() on an dictionary of dictionaries doesn't load full data
	structure on first call
Message-ID: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>

I've been using irclib to write a simple irc bot, and I was running into
some difficulties with pickle.  Upon some experimentation with pdb, I found
that pickle.load() doesn't load *all* of the data the _first_ time it's
called.

For instance, I have this dictionary pickled:
{'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
The first time I pickle.load() it, I get this:
{'xiong_chiamiov': {'name': 'James Pearson'}}
The 2nd time, I get the full thing.

Is this a bug in pickle, something wrong with the way I'm approaching this,
or what?  Full code is available at: http://github.com/xiongchiamiov/mpu/

-- 
James Pearson
--
The best way to predict the future is to invent it.
 - Alan Kay
--
GCS/MU d- s+:- a--- C++(++++)>$ ULC+(++)>$ P(+) L+++>++++$ !E W++(+++)$>$
N+(++) o? K-- w--- O? M--(+) V? PS+(--) PE++() Y+(++) PGP- !t !5 !X R-
tv-(--) b+>+++ DI+(++) D G e>++ h- r y- [http://tinyurl.com/23uv8t]
-------------- next part --------------
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From rozzin at geekspace.com  Sun Feb 22 19:46:35 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 19:46:35 -0500
Subject: choosing a default text-encoding in Python programs (was: To unicode
	or not to unicode)
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
	<mailman.455.1235314170.11746.python-list@python.org>
Message-ID: <87hc2mnfo4.fsf_-_@slice.rozzin.com>

Denis Kasak <denis.kasak at gmail.com> writes:
>
> > > Python "assumes" ASCII and if the decodes/encoded text doesn't
> > > fit that encoding it refuses to guess.
> >
> > Which is reasonable given that Python is programming language where it's
> > better to have more conservative assumption about encodings so errors
> > can be more quickly diagnosed.  A newsreader however is a different
> > beast, where it's better to make a less conservative assumption that's
> > more likely to display messages correctly to the user.  Assuming ISO
> > 8859-1 in the absense of any specified encoding allows the message to be
> > correctly displayed if the character set is either ISO 8859-1 or ASCII.
> > Doing things the "pythonic" way and assuming ASCII only allows such
> > messages to be displayed if ASCII is used.
>
> Reading this paragraph, I've began thinking that we've misunderstood
> each other. I agree that assuming ISO 8859-1 in the absence of
> specification is a better guess than most (since it's more likely to
> display the message correctly).

So, yeah--back on the subject of programming in Python and supporting
charactersets beyond ASCII:

If you have to make an assumption, I'd really think that it'd be
better to use whatever the host OS's default is, if the host OS has
such a thing--using an assumption of ISO 8859-1 works only in select
regions on unix systems, and may fail even in those select regions on
Windows, Mac OS, and other systems; without the OS considerations,
just the regional constraints are likely to make an ISO-8859-1
assumption result in /incorrect/ results anywhere eastward of central
Europe. Is a user in Russia (or China, or Japan) *really* most likely
to be using ISO 8859-1?

As a point of reference, here's what's in the man-pages that I have
installed (note the /complete/ and conspicuous lack of references to
even some notable eastern languages or character-sets, such as Chinese
and Japanese, in the /entire/ ISO-8859 spectrum):

   "ISO 8859 Alphabets
       The full set of ISO 8859 alphabets includes:

       ISO 8859-1    West European languages (Latin-1)
       ISO 8859-2    Central and East European languages (Latin-2)
       ISO 8859-3    Southeast European and miscellaneous languages (Latin-3)
       ISO 8859-4    Scandinavian/Baltic languages (Latin-4)
       ISO 8859-5    Latin/Cyrillic
       ISO 8859-6    Latin/Arabic
       ISO 8859-7    Latin/Greek
       ISO 8859-8    Latin/Hebrew
       ISO 8859-9    Latin-1 modification for Turkish (Latin-5)
       ISO 8859-10   Lappish/Nordic/Eskimo languages (Latin-6)
       ISO 8859-11   Latin/Thai
       ISO 8859-13   Baltic Rim languages (Latin-7)
       ISO 8859-14   Celtic (Latin-8)
       ISO 8859-15   West European languages (Latin-9)
       ISO 8859-16   Romanian (Latin-10)"

       "ISO 8859-1 supports the following languages: Afrikaans, Basque,
       Catalan, Danish, Dutch, English, Faeroese, Finnish, French,
       Galician, German, Icelandic, Irish, Italian, Norwegian,
       Portuguese, Scottish, Spanish, and Swedish."

       "ISO   8859-2  supports  the  following  languages:  Albanian,  Bosnian,
       Croatian, Czech, English, Finnish, German,  Hungarian,  Irish,  Polish,
       Slovak, Slovenian and Sorbian."

       "ISO 8859-7 encodes the characters used in modern monotonic
       Greek."

       "ISO 8859-9, also known as the "Latin Alphabet No. 5", encodes
       the characters used in Turkish."

       "ISO 8859-15 supports the following languages: Albanian, Basque, Breton,
       Catalan,  Danish,  Dutch,  English, Estonian, Faroese, Finnish, French,
       Frisian,  Galician,  German,  Greenlandic,  Icelandic,  Irish   Gaelic,
       Italian,  Latin,  Luxemburgish,  Norwegian, Portuguese, Rhaeto-Romanic,
       Scottish Gaelic, Spanish, and Swedish."

       "ISO  8859-16  supports  the  following  languages:  Albanian,  Bosnian,
       Croatian, English, Finnish, German, Hungarian, Irish, Polish, Romanian,
       Slovenian and Serbian."

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From rozzin at geekspace.com  Sun Feb 22 19:52:25 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 19:52:25 -0500
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
	<aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
	<mailman.475.1235338060.11746.python-list@python.org>
Message-ID: <873ae6nfee.fsf@slice.rozzin.com>

Ethan Furman <ethan at stoneleaf.us> writes:
>
> [...]partly because midnight is in fact a time of day, and not a lack of
> a time of day, I do indeed expect it to be True.

While it's not a lack of `time of day', it /is/ a lack of /elapsed/
time in the day ;)

Just as if you were using a plain integer or float to count the time :)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From sbassi at clubdelarazon.org  Sun Feb 22 19:53:25 2009
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Sun, 22 Feb 2009 21:53:25 -0300
Subject: Problem trying to install ReportLab with easy_install
In-Reply-To: <364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>
References: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
	<364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>
Message-ID: <9e2f512b0902221653m7f82018clb839f0f7f1f7d587@mail.gmail.com>

On Sun, Feb 22, 2009 at 10:07 AM, Garrett Cooper <yanegomi at gmail.com> wrote:

>    It's not building lib_renderPM_libart properly, or it's a typo
> that supposed to be librenderPM_libart, or bad LDFLAGS...
>    More details need to be provided like an ls of your site-packages
> directory and a partial ls of your local library directory (ls
> /usr/?local/?lib/lib*render*libart*, etc).
>

sbassi at hp:~$ ls /usr/lib/lib*ren*
/usr/lib/libktorrent.la        /usr/lib/libXrender.la
/usr/lib/libktorrent.so        /usr/lib/libXrender.so
/usr/lib/libktorrent.so.0      /usr/lib/libXrender.so.1
/usr/lib/libktorrent.so.0.0.0  /usr/lib/libXrender.so.1.3.0
/usr/lib/libXrender.a
sbassi at hp:~$ ls /usr/lib/libart*
/usr/lib/libart_lgpl_2.so.2        /usr/lib/libartsflow_idl.so.1
/usr/lib/libart_lgpl_2.so.2.3.16   /usr/lib/libartsflow_idl.so.1.0.0
/usr/lib/libart_lgpl.so.2          /usr/lib/libartsflow.so.1
/usr/lib/libart_lgpl.so.2.2.0      /usr/lib/libartsflow.so.1.0.0
/usr/lib/libartscbackend.la        /usr/lib/libartsgslplayobject.la
/usr/lib/libartscbackend.so.0      /usr/lib/libartsgslplayobject.so.0
/usr/lib/libartscbackend.so.0.0.0  /usr/lib/libartsgslplayobject.so.0.0.0
/usr/lib/libartsc.so.0             /usr/lib/libartskde.so.1
/usr/lib/libartsc.so.0.0.0         /usr/lib/libartskde.so.1.2.0
/usr/lib/libartsdsp.so.0           /usr/lib/libartswavplayobject.la
/usr/lib/libartsdsp.so.0.0.0       /usr/lib/libartswavplayobject.so.0
/usr/lib/libartsdsp_st.so.0        /usr/lib/libartswavplayobject.so.0.0.0
/usr/lib/libartsdsp_st.so.0.0.0

(t6)sbassi at hp:~/test/virtualenv-1.3.2/t6$ ls lib/python2.5/site-packages/
easy-install.pth            setuptools.pth
setuptools-0.6c9-py2.5.egg  xlwt-0.7.0-py2.5.egg

This is a virtualenv created with --no-site-packages (to have a clean start).
Other easy_install works, but this one, doesn't :(


From peter.anderson at internode.on.net  Sun Feb 22 19:55:35 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 11:55:35 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
References: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
Message-ID: <49A1F407.7080400@internode.on.net>

John Machin said:*

*"... the knowledge that you had attempted to contact Steve Ferg and 
have not yet had a response was not available on c.l.py and in any case 
is not a justification for incitement to hijack."

John, I resent the implication that I am trying to hijack Steve's 
project. This was never my intention. I am uneasy about posting this 
rebuttal on the list as this is not what I think lists like this are 
for; but given your response I will post this one reply in my defence. I 
think that if you want to follow up this matter do it off line.

For your information I have since been in contact with Steve and sent 
him a copy of my code. Its been my experience that there are some users 
of these lists who ought to hesitate before they jump in because they 
often are not in full possession of all the facts.

Once again (and for the last time) this was a personal project, I 
offered to share my additions to Steve's work in an informal way to 
anyone who helped me with fixing error responses I was getting - its a 
very long bow to draw to say this constitutes hijacking. It was NEVER my 
intention to hijack anyone's work and I resent the accusation.

To end, I have included below a statement that I added to the script 
that I sent to Terry:

-------------------------------------------------
This is an experimental version of EasyGui that has converted the latest
'official' version so that it will run under Python 3.0.1
The script is still being tested and any comments would be appreciated.

NOTE: This version of the script is not from Steve Ferg although his
contribution of the original script is acknowledged. This script is
released under the same Creative Commons Attribution 2.0 License as the
original script.
Modified by: Peter Anderson
Date: Monday, 23 February 2009
Contact: peterjohnanderson at gmail.com
-------------------------------------------------

As far as I am concerned that is the end of the matter on this list. 
Feel free to contact me off line if you want to follow up this post.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From bignose+hates-spam at benfinney.id.au  Sun Feb 22 20:05:13 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 23 Feb 2009 12:05:13 +1100
Subject: choosing a default text-encoding in Python programs
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
	<mailman.455.1235314170.11746.python-list@python.org>
	<87hc2mnfo4.fsf_-_@slice.rozzin.com>
Message-ID: <87y6vyhsja.fsf@benfinney.id.au>

Joshua Judson Rosen <rozzin at geekspace.com> writes:

> If you have to make an assumption, I'd really think that it'd be
> better to use whatever the host OS's default is, if the host OS has
> such a thing--using an assumption of ISO 8859-1 works only in select
> regions on unix systems, and may fail even in those select regions
> on Windows, Mac OS, and other systems; without the OS
> considerations, just the regional constraints are likely to make an
> ISO-8859-1 assumption result in /incorrect/ results anywhere
> eastward of central Europe. Is a user in Russia (or China, or Japan)
> *really* most likely to be using ISO 8859-1?

The fallacy in the above is to assume that a given programmer will
only be opening files created in their current locale. I say that is a
fallacy, because programmers in fact open program files created all
over the world in different locales; and those files should, where
possible, be interpreted by Python the same everwhere.

Assuming a *single*, defined, encoding in the absence of an explicit
declaration at least makes all Python installations (of a given
version) read any program file the same in any locale.

-- 
 \           ?If [a technology company] has confidence in their future |
  `\      ability to innovate, the importance they place on protecting |
_o__)     their past innovations really should decline.? ?Gary Barnett |
Ben Finney


From marduk at letterboxes.org  Sun Feb 22 20:10:56 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 20:10:56 -0500
Subject: pickle.load() on an dictionary of dictionaries doesn't load
	full data structure on first call
In-Reply-To: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
References: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
Message-ID: <1235351456.28498.19.camel@centar.nbk>

On Sun, 2009-02-22 at 16:15 -0800, James Pearson wrote:
> I've been using irclib to write a simple irc bot, and I was running
> into some difficulties with pickle.  Upon some experimentation with
> pdb, I found that pickle.load() doesn't load *all* of the data the
> _first_ time it's called.
> 
> For instance, I have this dictionary pickled:
> {'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
> The first time I pickle.load() it, I get this:
> {'xiong_chiamiov': {'name': 'James Pearson'}}
> The 2nd time, I get the full thing.
> 
> Is this a bug in pickle, something wrong with the way I'm approaching
> this, or what?  Full code is available at:
> http://github.com/xiongchiamiov/mpu/
> 

In general it's a bad idea to point the list to a full.  It's usually
wiser to deduce the issue to a relatively small, easily runnable,
snippet of code and then paste that snippet in your post.  Readers
usually don't want to have to read through your entire program to
understand what you are asking them.

Having said that, pickle is for serializing data.  You shouldn't be
opening a file in read/write/append mode and dumping and loading to the
same file object.  It's not a multi-access database like a DBMS is.  The
basic idea is:

     1. open (empty) file write-only.
     2. dump object(s) to file.
     3. close file

or 

     1. open file read-only
     2. load object(s) from file
     3. close file

Anything other than the two may lead to undesired/undefined behavior.

But the likely answer to your question is that your pickle file has (at
least) 2 objects stored in it.  And so on each load you get subsequent
objects.  That's probably the "undesired" affect of opening the file in
append mode.



From sjmachin at lexicon.net  Sun Feb 22 20:16:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 17:16:47 -0800 (PST)
Subject: choosing a default text-encoding in Python programs (was: To 
	unicode or not to unicode)
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net> 
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca> 
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca> 
	<mailman.455.1235314170.11746.python-list@python.org>
	<87hc2mnfo4.fsf_-_@slice.rozzin.com>
Message-ID: <f4727a34-132a-4b48-aab7-460c98cd27ed@x10g2000yqk.googlegroups.com>

On Feb 23, 11:46?am, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Denis Kasak <denis.ka... at gmail.com> writes:
>
> > > > Python "assumes" ASCII and if the decodes/encoded text doesn't
> > > > fit that encoding it refuses to guess.
>
> > > Which is reasonable given that Python is programming language where it's
> > > better to have more conservative assumption about encodings so errors
> > > can be more quickly diagnosed. ?A newsreader however is a different
> > > beast, where it's better to make a less conservative assumption that's
> > > more likely to display messages correctly to the user. ?Assuming ISO
> > > 8859-1 in the absense of any specified encoding allows the message to be
> > > correctly displayed if the character set is either ISO 8859-1 or ASCII.
> > > Doing things the "pythonic" way and assuming ASCII only allows such
> > > messages to be displayed if ASCII is used.
>
> > Reading this paragraph, I've began thinking that we've misunderstood
> > each other. I agree that assuming ISO 8859-1 in the absence of
> > specification is a better guess than most (since it's more likely to
> > display the message correctly).
>
> So, yeah--back on the subject of programming in Python and supporting
> charactersets beyond ASCII:
>
> If you have to make an assumption, I'd really think that it'd be
> better to use whatever the host OS's default is, if the host OS has
> such a thing--using an assumption of ISO 8859-1 works only in select
> regions on unix systems, and may fail even in those select regions on
> Windows, Mac OS, and other systems; without the OS considerations,
> just the regional constraints are likely to make an ISO-8859-1
> assumption result in /incorrect/ results anywhere eastward of central
> Europe. Is a user in Russia (or China, or Japan) *really* most likely
> to be using ISO 8859-1?
>
> As a point of reference, here's what's in the man-pages that I have
> installed (note the /complete/ and conspicuous lack of references to
> even some notable eastern languages or character-sets, such as Chinese
> and Japanese, in the /entire/ ISO-8859 spectrum):

1. As a point of reference for what?
2. The ISO 8859 character sets were deliberately restricted to scripts
that would fit in 8 bits. So Chinese, Japanese, Korean and Vietnamese
aren't included. Note that Chinese and Japanese already each had
*multiple* legacy (i.e. non-Unicode) character sets ... they (and the
rest the world) don't want/need yet another character set for each
language and never did want/need one.


From sjmachin at lexicon.net  Sun Feb 22 20:26:05 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 17:26:05 -0800 (PST)
Subject: Python 3 and easygui problem
References: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
	<mailman.483.1235350548.11746.python-list@python.org>
Message-ID: <d50c720d-b195-4e1a-8a64-aec31a2bf529@j8g2000yql.googlegroups.com>

On Feb 23, 11:55?am, Peter Anderson <peter.ander... at internode.on.net>
wrote:
> John Machin said:*
>
> *"... the knowledge that you had attempted to contact Steve Ferg and
> have not yet had a response was not available on c.l.py and in any case
> is not a justification for incitement to hijack."
>
> John, I resent the implication that I am trying to hijack Steve's
> project. This was never my intention. I am uneasy about posting this
> rebuttal on the list as this is not what I think lists like this are
> for; but given your response I will post this one reply in my defence. I
> think that if you want to follow up this matter do it off line.

I'll keep it online for the same reason that you did.

Please re-read what I wrote:
"""
Thank you, but your intentions stated above are just fine and what I
presumed. The issue is not with you but with Terry ...
"""

How you managed to construe that as an implication that you were
trying to hijack Steve's project, I can't imagine.

You wrote: "It was NEVER my intention to hijack anyone's work and I
resent the accusation."

There was no such accusation.



From steven at REMOVE.THIS.cybersource.com.au  Sun Feb 22 21:43:59 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 02:43:59 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <pan.2009.02.23.02.43.59@REMOVE.THIS.cybersource.com.au>

On Sun, 22 Feb 2009 16:13:02 +0100, Torsten Mohr wrote:

> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?

Never, and never.


> Integers are obviously passed by value, lists and dicts by reference.

Your error is assuming that pass-by-value and pass-by-reference are the 
only two possibilities, consequently you are misinterpreting what you see.

Python uses the same evaluation strategy regardless of the type of object 
being passed. Sometimes that strategy looks something like pass-by-value, 
and sometimes it looks something like pass-by-reference, but in fact it 
always behaves consistently no matter what object you use.


> Is there a general rule?  Some common formulation?


http://en.wikipedia.org/wiki/Evaluation_strategy#Call_by_sharing
http://effbot.org/zone/call-by-object.htm




-- 
Steven


From ccormie at aussiemail.com.au  Sun Feb 22 22:56:09 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Mon, 23 Feb 2009 14:56:09 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a culprit
	.dll and symbol?
Message-ID: <01b213c7$0$20626$c3e8da3@news.astraweb.com>

Hi,

I've been Googling around on a moderately common Windows Python problem: 
a mismatch between the symbols a python extension thinks are available 
and the contents of the associated DLL. Python users running into this 
problem are greeted with:

import <somemodule>
"ImportError: DLL load failed: The specified procedure could not be found."

That's it: no mention of which dll nor which symbol is causing the 
problem. Both these pieces of information are helpful/important in 
resolving this class of problem: how does one get Python to dump this 
debugging data?

(>python -v -d
doesn't help, BTW)

Regards,
Chris


From xiong.chiamiov at gmail.com  Sun Feb 22 22:58:27 2009
From: xiong.chiamiov at gmail.com (James Pearson)
Date: Sun, 22 Feb 2009 19:58:27 -0800
Subject: pickle.load() on an dictionary of dictionaries doesn't load full 
	data structure on first call
In-Reply-To: <1235351456.28498.19.camel@centar.nbk>
References: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
	<1235351456.28498.19.camel@centar.nbk>
Message-ID: <7dbb3da80902221958g4dc579f3k21e31e9468f2a619@mail.gmail.com>

Ah, thank you, you explained that quite well and opened my eyes to some
things I very much need to improve in my code.  I'll keep those
list-etiquette things in mind next time.

On Sun, Feb 22, 2009 at 5:10 PM, Albert Hopkins <marduk at letterboxes.org>wrote:

> On Sun, 2009-02-22 at 16:15 -0800, James Pearson wrote:
> > I've been using irclib to write a simple irc bot, and I was running
> > into some difficulties with pickle.  Upon some experimentation with
> > pdb, I found that pickle.load() doesn't load *all* of the data the
> > _first_ time it's called.
> >
> > For instance, I have this dictionary pickled:
> > {'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
> > The first time I pickle.load() it, I get this:
> > {'xiong_chiamiov': {'name': 'James Pearson'}}
> > The 2nd time, I get the full thing.
> >
> > Is this a bug in pickle, something wrong with the way I'm approaching
> > this, or what?  Full code is available at:
> > http://github.com/xiongchiamiov/mpu/
> >
>
> In general it's a bad idea to point the list to a full.  It's usually
> wiser to deduce the issue to a relatively small, easily runnable,
> snippet of code and then paste that snippet in your post.  Readers
> usually don't want to have to read through your entire program to
> understand what you are asking them.
>
> Having said that, pickle is for serializing data.  You shouldn't be
> opening a file in read/write/append mode and dumping and loading to the
> same file object.  It's not a multi-access database like a DBMS is.  The
> basic idea is:
>
>     1. open (empty) file write-only.
>     2. dump object(s) to file.
>     3. close file
>
> or
>
>     1. open file read-only
>     2. load object(s) from file
>     3. close file
>
> Anything other than the two may lead to undesired/undefined behavior.
>
> But the likely answer to your question is that your pickle file has (at
> least) 2 objects stored in it.  And so on each load you get subsequent
> objects.  That's probably the "undesired" affect of opening the file in
> append mode.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
James Pearson
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From steven at REMOVE.THIS.cybersource.com.au  Sun Feb 22 23:09:17 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 04:09:17 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
Message-ID: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>

On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:

> as far as i understand things, the best model is:
> 
> 1 - everything is an object
> 2 - everything is passed by reference 

Except that is wrong. If it were true, you could do this:

def swap(x, y):
    y, x = x, y

a = 1
b = 2
swap(a, b)
assert a == 2 and b == 1


but you can't, it does not work. Ergo, parameter passing in Python does 
not have the same semantics as languages that use pass-by-reference, such 
as Pascal and Basic. That means that even if you can justify the claim 
"Python is pass-by-reference" by some technical argument (and I don't 
believe you can), it is misleading to make that claim without further 
qualifications.


> 3 - some objects are immutable

All objects are passed the same way, regardless of whether they are 
mutable or immutable.


> 4 - some (immutable?) objects are cached/reused by the system

That's irrelevant. Caching affects the creation of new objects, but has 
no effect on argument passing.



-- 
Steven


From venutaurus539 at gmail.com  Sun Feb 22 23:13:23 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Sun, 22 Feb 2009 20:13:23 -0800 (PST)
Subject: How to open a remote file using python.
Message-ID: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>

Hello all,
           I am writing an application where I need to open a shared
file on a remote machine using python script. I tried using the
following function:

f = urllib.open("\\remote_machine\\folder1\\file1.doc")

         I also tried using

class urllib.FancyURLopener(...)

         but didn't work. Can some one help me in this regard.

Thank you in advance,
Venu


From clp2 at rebertia.com  Sun Feb 22 23:21:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 20:21:43 -0800
Subject: How to open a remote file using python.
In-Reply-To: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
Message-ID: <50697b2c0902222021h4d545688y57cedf768eae1aab@mail.gmail.com>

On Sun, Feb 22, 2009 at 8:13 PM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> Hello all,
>           I am writing an application where I need to open a shared
> file on a remote machine using python script. I tried using the
> following function:
>
> f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
>         I also tried using
>
> class urllib.FancyURLopener(...)
>
>         but didn't work. Can some one help me in this regard.

That function and class are be for retrieving materials over the web
(typically HTTP/FTP); however, your path suggests you're trying to
access a file over a local Windows network, so those aren't
appropriate. The regular open() function would have a better chance of
working for this. Have you tried it?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From google at mrabarnett.plus.com  Sun Feb 22 23:25:13 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 04:25:13 +0000
Subject: How to open a remote file using python.
In-Reply-To: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
Message-ID: <49A22529.8000300@mrabarnett.plus.com>

venutaurus539 at gmail.com wrote:
> Hello all,
>            I am writing an application where I need to open a shared
> file on a remote machine using python script. I tried using the
> following function:
> 
> f = urllib.open("\\remote_machine\\folder1\\file1.doc")
> 
>          I also tried using
> 
> class urllib.FancyURLopener(...)
> 
>          but didn't work. Can some one help me in this regard.
> 
What do you mean by "remote machine"? Do you mean you want to open a
file that's in a shared folder on a machine that's on the same local
network?

If it's meant to be a Windows filepath then it should be:

     f = open(r"\\remote_machine\folder1\file1.doc")

(If the file is a Microsoft Word document file, then you won't probably
be able to make much sense of its contents using open().)


From michele.simionato at gmail.com  Sun Feb 22 23:38:40 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 23 Feb 2009 05:38:40 +0100
Subject: How to inherit from two classes without metaclass clashing ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<mailman.289.1235077114.11746.python-list@python.org>
	<ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>
Message-ID: <4edc17eb0902222038gbdf39feyb806537c990fca08@mail.gmail.com>

On Sun, Feb 22, 2009 at 2:29 PM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Michele,
>
> I tried understanding how to avoid the metaclasses clashing, and I did read
> the link you referred to below,
> as well as the relevant O'Reilly cookbook chapter (Recipe 20.17. Solving
> Metaclass Conflicts), but seems I do not understand the correct syntax to
> use, as I either get
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 323, in <module>
>     class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
>
> or
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 322, in <module>
>     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> TypeError: Error when calling the metaclass bases
>     multiple bases have instance lay-out conflict

This is not a matter of syntax. wx.Frame is a C++-coded class with a
non standard
layout and there is nothing than the recipe can do to solve the
metaclass conflict.
I guess you are using an old version of wx since I cannot reproduce the problem.
Let us see what the wx guys say.


From venutaurus539 at gmail.com  Mon Feb 23 00:02:13 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Sun, 22 Feb 2009 21:02:13 -0800 (PST)
Subject: How to open a remote file using python.
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
Message-ID: <00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>

On Feb 23, 9:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> venutaurus... at gmail.com wrote:
> > Hello all,
> > ? ? ? ? ? ?I am writing an application where I need to open a shared
> > file on a remote machine using python script. I tried using the
> > following function:
>
> > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
> > ? ? ? ? ?I also tried using
>
> > class urllib.FancyURLopener(...)
>
> > ? ? ? ? ?but didn't work. Can some one help me in this regard.
>
> What do you mean by "remote machine"? Do you mean you want to open a
> file that's in a shared folder on a machine that's on the same local
> network?
>
> If it's meant to be a Windows filepath then it should be:
>
> ? ? ?f = open(r"\\remote_machine\folder1\file1.doc")
>
> (If the file is a Microsoft Word document file, then you won't probably
> be able to make much sense of its contents using open().)

Thanks to all for your brisk replies:

        Yes, my aim is to open a file from another machine in the same
LAN. It also worked using

>>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")

        But now I also have to copy the same file to the local machine
in Python. Do I need to follow any protocols for this?

Thank you,
Venu.













From odeits at gmail.com  Mon Feb 23 00:06:10 2009
From: odeits at gmail.com (odeits)
Date: Sun, 22 Feb 2009 21:06:10 -0800 (PST)
Subject: How to open a remote file using python.
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
	<00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
Message-ID: <69d01028-2a8e-4717-b7e4-ba17fa2ca174@r41g2000yqm.googlegroups.com>

On Feb 22, 9:02?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 23, 9:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
>
>
> > venutaurus... at gmail.com wrote:
> > > Hello all,
> > > ? ? ? ? ? ?I am writing an application where I need to open a shared
> > > file on a remote machine using python script. I tried using the
> > > following function:
>
> > > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
> > > ? ? ? ? ?I also tried using
>
> > > class urllib.FancyURLopener(...)
>
> > > ? ? ? ? ?but didn't work. Can some one help me in this regard.
>
> > What do you mean by "remote machine"? Do you mean you want to open a
> > file that's in a shared folder on a machine that's on the same local
> > network?
>
> > If it's meant to be a Windows filepath then it should be:
>
> > ? ? ?f = open(r"\\remote_machine\folder1\file1.doc")
>
> > (If the file is a Microsoft Word document file, then you won't probably
> > be able to make much sense of its contents using open().)
>
> Thanks to all for your brisk replies:
>
> ? ? ? ? Yes, my aim is to open a file from another machine in the same
> LAN. It also worked using
>
> >>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")
>
> ? ? ? ? But now I also have to copy the same file to the local machine
> in Python. Do I need to follow any protocols for this?
>
> Thank you,
> Venu.

the copy in shutil will work just fine.
import shutil
shutil.copy(remotepath,localpath)


From clp2 at rebertia.com  Mon Feb 23 00:10:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 21:10:38 -0800
Subject: How to open a remote file using python.
In-Reply-To: <00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
	<00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
Message-ID: <50697b2c0902222110n783f9d11xb1c4245ba532e170@mail.gmail.com>

On Sun, Feb 22, 2009 at 9:02 PM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> On Feb 23, 9:25 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> venutaurus... at gmail.com wrote:
>> > Hello all,
>> >            I am writing an application where I need to open a shared
>> > file on a remote machine using python script. I tried using the
>> > following function:
>>
>> > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>>
>> >          I also tried using
>>
>> > class urllib.FancyURLopener(...)
>>
>> >          but didn't work. Can some one help me in this regard.
>>
>> What do you mean by "remote machine"? Do you mean you want to open a
>> file that's in a shared folder on a machine that's on the same local
>> network?
>>
>> If it's meant to be a Windows filepath then it should be:
>>
>>      f = open(r"\\remote_machine\folder1\file1.doc")
>>
>> (If the file is a Microsoft Word document file, then you won't probably
>> be able to make much sense of its contents using open().)
>
> Thanks to all for your brisk replies:
>
>        Yes, my aim is to open a file from another machine in the same
> LAN. It also worked using
>
>>>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")
>
>        But now I also have to copy the same file to the local machine
> in Python. Do I need to follow any protocols for this?

You may find urllib.urlretrieve() useful for accomplishing that.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From denis.kasak at gmail.com  Mon Feb 23 00:54:16 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 06:54:16 +0100
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>

On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>
>> as far as i understand things, the best model is:
>>
>> 1 - everything is an object
>> 2 - everything is passed by reference
>
> Except that is wrong. If it were true, you could do this:
>
> def swap(x, y):
>    y, x = x, y
>
> a = 1
> b = 2
> swap(a, b)
> assert a == 2 and b == 1
>
>
> but you can't, it does not work. Ergo, parameter passing in Python does
> not have the same semantics as languages that use pass-by-reference, such
> as Pascal and Basic. That means that even if you can justify the claim
> "Python is pass-by-reference" by some technical argument (and I don't
> believe you can), it is misleading to make that claim without further
> qualifications.

You could, however, argue that the swap function doesn't work as
expected (e.g. from a Pascal or a C++ POV) simply because the
underlying objects aren't mutable. The objects *do* get passed by
reference; the function doesn't receive a new copy of the object and
it can examine the original object's ID. The actual culprit is not the
way objects are passed but the assignment operator, since it works by
rebinding names (as Andrew Koenig explained) and not by changing the
object itself. If the swap() function could somehow access the
underlying integer object and modify it, swapping of values would
indeed occur because the function *did* get references to the objects
passed to it.

That said, it's a rather convoluted way of explaining what happens and
calling it pass-by-object feels much better. :-)

-- 
Denis Kasak


From sjmachin at lexicon.net  Mon Feb 23 01:38:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 22:38:47 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
Message-ID: <5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>

On Feb 23, 2:56?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> Hi,
>
> I've been Googling around on a moderately common Windows Python problem:
> a mismatch between the symbols a python extension thinks are available
> and the contents of the associated DLL. Python users running into this
> problem are greeted with:
>
> import <somemodule>
> "ImportError: DLL load failed: The specified procedure could not be found."
>
> That's it: no mention of which dll nor which symbol is causing the
> problem. Both these pieces of information are helpful/important in
> resolving this class of problem: how does one get Python to dump this
> debugging data?
>
> (>python -v -d
> doesn't help, BTW)

Use -vv ... you need to know exactly which of possibly many
incarnations of somemodule.pyd Python is trying to import from.

Then get a copy of the Dependency Walker from http://www.dependencywalker.com/

Open c:\the\failing\somemodule.pyd with the DW. Look at grumble
messages in the bottom pane. Note: you often get 1 or 2 warning
messages with a pyd that's not having problems. Scroll through all the
modules in the middle pane, looking for grumbles.

If that not-very-technical description [all I've ever needed] doesn't
help, you'll need to read the DW help file (HTFF1K) or wait till
someone who knows what they are doing comes along :-)

By the way, I presume that you are aware that extensions on Windows
are tied to a particular version of Python ... you would have got a
different error message if you had a version mismatch (I think). If
your problem is not obvious, come back here with:
-- what version of Python you are running
-- what DLLs you find in the middle pane whose names match
   (1) MSVC*.DLL
   (2) PYTHON??.DLL

You may need to answer questions about the extension (e.g. compiler/
linker options used) -- is it your extension or a 3rd party's?

HTH,
John


From sternbrightblade at gmail.com  Mon Feb 23 01:51:39 2009
From: sternbrightblade at gmail.com (Tony)
Date: Sun, 22 Feb 2009 22:51:39 -0800
Subject: different errors, return outside function and others
Message-ID: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>

Hi,
I am trying to write a small program for my final for school, everytime i
run my program it gives me a return outside function error (after i fixed
all the indentation errors it throws at me), i am not very good at
programing with python atm, so any help would be appreiciated. and if im
missing somethign please feel free to throw
any suggestions out there.

#This is a Text based RPG
# HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss Hit
Points
def fakemain(): #This is a place holder for me untill im ready to run the
program
start()
    startselection = start()
    if startselection == 1:
        character_creation()
    else:
        #end game (need the code to exit program)

    charselection = character_creation()
    if charselection == 1:
        name = raw_input ('Please Enter Your Name')
        HP = dice_roll2()
        print 'Your HP is ',HP
    elif charselection == 2:
        name = raw_input ('Please Enter Your Name')
        HP = dice_roll()
        print 'Your HP is ',HP
    else:

intro_area()
    introselection = intro_area()
    if introselection == 1:
        print 'A Zombie Attacks you'
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        intro_area()
    else:
        back_yard()
    backyardselection = back_yard()
    if backyardselection == 1:
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    else:
        print 'The Zombie leaps and reaches you before you shut the door.'
        print 'YOU HAVE DIED!!!'
            #reset the game (need the code to reset program)

Alley()
    alleyselection = Alley()
    if alleyselection == 1:
        police_station()
    else:   #The object here is for the person to die if they select option
2
        print 'As you try to get something to munch on 5 zombies attack you'
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    policeselection = police_station()
    if policeselection == 1:
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    else:
        print 'The door mysteriously locked itself'
        police_station()
police_backdoor()
    policebackselection = police_backdoor()
    if policebackselection == 1:
        forest()
    else:
        print 'The Front Door is locked only way out is the backdoor'
        police_backdoor()

    forestselection = forest()
    if forestselection == 1:
        fight(HP, ZBHP, weapon, True)
        death(HP, ZHP, ZBHP)
        end()
    else:
        print 'Jonas reaches you before you get back and eats your brains'
        #End game
    endselection = end()
    if endselection == 1:
        #End program or play rick roll'd haha
    else:
        #reset program


#This mod is the first area you are in
def intro_area():
    introselection = 0
    print ' Welcome to Zombie Survival'
    print ' It is a quite night in Egad, Wisconsin when..You suddenly awake'
    print ' to the sounds from outside. You see sparks outside from your
window.'
    print ' The phone line has been cut. You have nothing to help you fend'
    print ' of attackers. What will you do!!!'
    print
    print '1. Open the Front door?'
    print '2. Go out the back door and towards the alley?'
    while introselection < 1 or introselection > 2
        print 'That area is unavaible please buy the expansion haha'
    return introselection

#This is the second area of the RPG
def back_yard():
    backyardselection = 0
    print ' As you make your way out the back door, a Zombie appears from
the'
    print ' side of the yard. He is slowly making his way to you, and you
have'
    print ' to kill him to get to the alley. What course of action will you
take.'
    print
    print '1.Fight the Zombie?'
    print '2.Run Away?'
    while backyardselection < 1 or backyardselection > 2:
        print 'That is a unavailible course of action.'
        #fight zombie
    return backyardselection

#The Alley No Zombie fight here
def Alley():
    alleyselection = 0
    print 'After you killed the Zombie you begin to cautiously walk down the
alley'
    print 'looking for something to help you fend off anymore Zombies. When
you'
    print 'get near the end of the alley you find a baseball bat and a first
aid'
    print 'kit laying on the ground, You instinctifly pick up the bat and
first'
    print 'aid kit, You reach the end of the alley, and you look around for
a'
    print 'place to hide. Then you remeber about the forest beyond the
police'
    print 'station. What will you do?'
    print
    print '1.Run to the police station?'
    print '2.Run to the grocery store?'
    while alleyselection < 1 or alleyselection > 2:
        print 'Theres a group of zombies over there!!'
    return alleyselection

#fight 2 Zombies here
def police_station():
    policeselection = 0
    print 'You make your way down the street and avoid all the zombies. when
you'
    print 'reach the police station, The lights are flickering on and off.
You see'
    print 'couple people moving around on the inside. As you open the front
door'
    print 'the two zombies look at you and start heading torwards you. You
raise'
    print 'your bat and prepare to kill them. What will you do first?'
    print
    print '1.Stand your ground?'
    print '2.Run back outside the door?'
    while policeselection < 1 or policeselection > 2:
        print 'Impossible please try again'
    return policeselection
        #fight 2 zombies

#No Zombies here
def police_backdoor():
    policebackselection = 0
    print 'You look down at the two zombies you just killed and see a gun.'
    print 'You lean over and grab the gun and the ammo. Then you start to'
    print 'look around and you notice another first aid kit, You walk over'
    print 'there and patch yourself up. After your done you head towards
the'
    print 'back door. what will you do?'
    print
    print '1.Open the door?'
    print '2.Go Home?'
    while policebackselection < 1 or policebackselection > 2:
        print 'Not possible'
    return policebackselection

#last area, boss is here
def forest():
    forestselection = 0
    print 'You open the back door and you begin to walk out into the
forest.'
    print 'As your steping through the trees, you look ahead of you and you'
    print 'see someone moving slowly towards you. As you focus you see that'
    print 'its your old army buddy Jonas, You yell at him but he just keeps'
    print 'moving towards you. You begin to notice that he is also a zombie'
    print 'What will you do now?'
    print
    print '1.Draw your gun and kill Jonas?'
    print '2.Go back into the police station?'
    while forestselection < 1 or forestselection > 2:
        print 'That option will be in the expansion lol'
    return forestselection
            #Fight Boss here

#this is for the Ending
def End():
    endselection = 0
    print 'You have completed the Zombie survival game.'
    print
    print '1. End Game'
    print '2. Start Over'
    while endselection < 1 or endselection > 2:
        print 'Dont Taze me!!'
    return endselection

#this is for the start of the game
def start():
    startselection = 0
    print '      Zombie Survial 1.0.1'
    print
    print '1. Start Game
    print '2. End Game'
            #if End game put rick roll'd there
            #Survial Mode (only if i can get this finished)
    while startselection < 1 or startselection > 2:
        print 'Please enter a selection 1 or 2
        startselection = input('Press 1 to start the game')
    return startselection

#This module is for the character creation at the beginning game and
determines
#how much health you have
def character_creation():
    charselection = 0
    print '         Create your character'
    print '1. Male'
    print '2. Female'
    print '3. Be a coward and Quit'
    while charselection < 1 or charselection > 3:
        print 'Please enter a selection 1-3'
        charselection = input ('please inter gender')
    return charselection

#This module is for the monster named Zombie
def Zombie():
    ZHP = dice_roll2()
    while ZHP > 0:
    return ZHP

#This is for the Boss named Jonas
def Zombie_Boss():
    ZBHP = dice_roll4()
    while ZBHP > 0:
    return ZBHP

#specific for Zombie Boss HP
def dice_roll4():
    seed()
    dice4 = random.randrange(4, 24, 1)
    return dice4

#This Module is for 2d6 sided dice
def dice_roll2():
    seed()
    dice2 = random.randrange(2, 12, 1)
    return dice2

#This Module is for 1d6 sided dice
def dice_roll():
    seed()
    dice = random.randrange(1, 6, 1)
    return dice

#weapons = fist, gun, baseball bat
# for regular zombie
#call fight(HP, ZHP, weapon)
# for boss zombie
#call fight(HP, ZBHP, weapon, True)
def fight(HP, ZHP, weapon, boss=False):
    if weapon == 'fist':
        while HP > 0 and ZHP > 0:
            damage = 2
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2
    elif weapon == 'baseball bat':
        while HP > 0 and ZHP > 0:
            damage = dice_roll()
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2
    else weapon == 'gun':
        while HP > 0 and ZHP >0:
            damge = dice_roll2()
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2

#This module is used when you die
def death(HP, ZHP, ZBHP):
    if HP == 0:
        print 'You have Died.'
    elif ZHP == 0:
        print 'You have killed the Zombie.'
    elif ZBHP == 0:
        print 'Right before you kill the Zombie, he runs off.'
-------------- next part --------------
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From clp2 at rebertia.com  Mon Feb 23 01:58:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 22:58:22 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <50697b2c0902222258h75b1fdeeif736260818dfd6b3@mail.gmail.com>

On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:
> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.

Please provide the full error message you're getting.

Cheers,
Chris

--
Follow the path of the Iguana...
http://rebertia.com


From kom2 at centrum.cz  Mon Feb 23 02:51:27 2009
From: kom2 at centrum.cz (Kom2)
Date: Sun, 22 Feb 2009 23:51:27 -0800 (PST)
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
Message-ID: <73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>

On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
> Kom2 wrote:
> > Hello,
> > I'm trying to convert my project from python 2.5 to python 3.0 and I
> > have the following problem. My project is PYD library written in C++.
> > So I have this PyInit_ModuleName function containing PyModule_Create
> > call and this function also call some script with declarations:
>
> > ? ?PyObject* m;
>
> > ? ?m = PyModule_Create(&PyVRDAModule);
> > ? ?if (m == NULL) {
> > ? ? ? return NULL;
> > ? ?}
> > ? ?PyObject *d, *v;
> > ? ?d = PyModule_GetDict(m);
> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> > d, NULL);
> > ? ?......
>
> > txtPyPredefinedConstants is string with this content:
>
> > class CursorMoveType:
> > ? ?First = 0
> > ? ?Last = 1
> > ? ?Next = 2
> > ? ?Previous = 3
> > ? ?Bookmark = 4
> > ? ?NewRecord = 5
>
> > In Python 2.5 everything works fine, now in python3.0
> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
> > found".
>
> > Can anybody tell mi please, what is wrong?
>
> Presumably you haven't upgraded your extension module to use the new API?
>
> ?http://wiki.python.org/moin/PortingExtensionModulesToPy3k
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Sorry, but I didn't get your point. I read the article, but I can't
see anything about running script in module Init function...


From afriere at yahoo.co.uk  Mon Feb 23 02:52:10 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Sun, 22 Feb 2009 23:52:10 -0800 (PST)
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <87d8049c-a400-42f8-b2ac-8ab0bf0b4663@m24g2000vbp.googlegroups.com>

On Feb 23, 2:13?am, Torsten Mohr <tm... at s.netic.de> wrote:
> Hi,
>
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
>
> def f1(a):
> ? ? a = 7
>
> b = 3
> f1(b)
> print b
> => 3
>
> Integers are obviously passed by value, lists and dicts by reference.
>
> Is there a general rule? ?Some common formulation?
>
> Thanks for any hints,
> Torsten.

Let's add some comments and a little code

>>>def f1 (a) :
      print a, id(a)
      #print the object passed and it's id
      a = 7
      #reassign 'a' to point to a different object
      print a, id(a)
      #print the new object and it's id

>>> b = 1
>>> #make 'b' refer to object '1' residing at a particular memory location
>>> id(b)
161120104
>>> #which we might refer to as 161120104
>>> f1(b) #pass the object '1' refered to by 'b' to our function
1 161120104
7 161120032
>>> #no surprises there, the new object has a different id.
>>> id(b)
161120104
>>> #no surprises ther, b (unlike the name internal to the function
>>> #hasn't been reassigned, so it still points where it always has
>>> #which is of course ..
>>> b
1
>>> z = []
>>> #name 'z' refers to an empty list
>>> id(z)
162432780
>>> f1(z)
[] 162432780
7 161120032
>>> #no surprise that the empty list object has the same id outside
>>> #and inside the function
>>> #stranger is that the '7' object has the same id as the 7 object
>>> #created on the previous run on the function, but that is another
>>> #story


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:03:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:03:54 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak <denis.kasak at gmail.com>  
escribi?:

> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
> <steven at remove.this.cybersource.com.au> wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>>
>> Except that is wrong. If it were true, you could do this:
>>
>> def swap(x, y):
>>    y, x = x, y
>>
>> a = 1
>> b = 2
>> swap(a, b)
>> assert a == 2 and b == 1
>>
>>
>> but you can't, it does not work. Ergo, parameter passing in Python does
>> not have the same semantics as languages that use pass-by-reference,  
>> such
>> as Pascal and Basic. That means that even if you can justify the claim
>> "Python is pass-by-reference" by some technical argument (and I don't
>> believe you can), it is misleading to make that claim without further
>> qualifications.
>
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable.

That's irrelevant - mutable and immutable objects are passed exactly the  
same way.

> The objects *do* get passed by
> reference; the function doesn't receive a new copy of the object and
> it can examine the original object's ID. The actual culprit is not the
> way objects are passed but the assignment operator, since it works by
> rebinding names (as Andrew Koenig explained) and not by changing the
> object itself.

There is *no* difference between "the way objects are passed" and "the  
assignment opera[tion]": both work exactly the same way.

Python execution model is based on namespaces (a collection of  
name->object pairs, usually implemented as dictionaries). An assignment x  
= y means:

  - evaluate the right hand side and obtain a value (an object, always). In  
this case, it is the object referenced by the name "y"
  - make the name "x" refer to such object. That's all.

In short, assignment rebinds a name in a namespace.
When a function call is made, a new namespace is created. The names come  
 from the function parameters (the names that were used to define the  
function in the def ... line) and the objects come from the actual  
arguments (the objects you pass inside the (...) when doing the call). The  
function code is then executed using this namespace as its locals().

def foo(a, b):
   print a, b

foo(4, ['hello', 'world!'])

The call is equivalent to:
   ns = {}
   ns['a'], ns['b'] = 4, ['hello', 'world!']
   execute foo code using ns as locals

except the right hand side is evaluated on the *calling* namespace, and  
the left hand assignments are done on the new namespace. So a call binds  
many names in a new namespace: the same as assignment.

No copies, no pointers, nothing: only names and objects are manipulated.

> If the swap() function could somehow access the
> underlying integer object and modify it, swapping of values would
> indeed occur because the function *did* get references to the objects
> passed to it.

There is a difference between modify the value of an object, and modify  
the caller's namespace. Usually "pass by reference" means that the  
*caller* may see a different thing after the call - this is not true in  
Python, there is no way the called code could alter the caller namespace  
(well, not just due to the call operation alone...)

> That said, it's a rather convoluted way of explaining what happens and
> calling it pass-by-object feels much better. :-)

And is more correct...

-- 
Gabriel Genellina



From neoedmund at gmail.com  Mon Feb 23 03:06:58 2009
From: neoedmund at gmail.com (neoedmund)
Date: Mon, 23 Feb 2009 00:06:58 -0800 (PST)
Subject: confusing UnboundLocalError behaive
Message-ID: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>

see the 3 small piece of code, i cannot understand why it result as
this.

1.
def test():
	abc="111"
	def m1():
		print(abc)
	m1()
test()

Output: 111

2.
def test():
	abc="111"
	def m1():
		print(abc)
		abc+="222"
	m1()
test()

Output:
   print(abc)
UnboundLocalError: local variable 'abc' referenced before assignment

3.
def test2():
	abc=[111]
	def m1():
		print(abc)
		abc.append(222)
	m1()
	print(abc)
test2()

Output:
[111]
[111,222]

it seems "you cannot change the outter scope values but can use it
readonly."


From sternbrightblade at gmail.com  Mon Feb 23 03:08:45 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 00:08:45 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>

The full error message says "There's an error in your program: *** 'return'
outside function (final(2).py, line 114)
 which is were this return statement is..

    while introselection < 1 or introselection > 2:
        print 'That area is unavaible please buy the expansion haha'
    return introselection
On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:

> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.
>
> #This is a Text based RPG
> # HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss
> Hit Points
> def fakemain(): #This is a place holder for me untill im ready to run the
> program
> start()
>     startselection = start()
>     if startselection == 1:
>         character_creation()
>     else:
>         #end game (need the code to exit program)
>
>     charselection = character_creation()
>     if charselection == 1:
>         name = raw_input ('Please Enter Your Name')
>         HP = dice_roll2()
>         print 'Your HP is ',HP
>     elif charselection == 2:
>         name = raw_input ('Please Enter Your Name')
>         HP = dice_roll()
>         print 'Your HP is ',HP
>     else:
>
> intro_area()
>     introselection = intro_area()
>     if introselection == 1:
>         print 'A Zombie Attacks you'
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         intro_area()
>     else:
>         back_yard()
>     backyardselection = back_yard()
>     if backyardselection == 1:
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     else:
>         print 'The Zombie leaps and reaches you before you shut the door.'
>         print 'YOU HAVE DIED!!!'
>             #reset the game (need the code to reset program)
>
> Alley()
>     alleyselection = Alley()
>     if alleyselection == 1:
>         police_station()
>     else:   #The object here is for the person to die if they select option
> 2
>         print 'As you try to get something to munch on 5 zombies attack
> you'
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     policeselection = police_station()
>     if policeselection == 1:
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     else:
>         print 'The door mysteriously locked itself'
>         police_station()
> police_backdoor()
>     policebackselection = police_backdoor()
>     if policebackselection == 1:
>         forest()
>     else:
>         print 'The Front Door is locked only way out is the backdoor'
>         police_backdoor()
>
>     forestselection = forest()
>     if forestselection == 1:
>         fight(HP, ZBHP, weapon, True)
>         death(HP, ZHP, ZBHP)
>         end()
>     else:
>         print 'Jonas reaches you before you get back and eats your brains'
>         #End game
>     endselection = end()
>     if endselection == 1:
>         #End program or play rick roll'd haha
>     else:
>         #reset program
>
>
> #This mod is the first area you are in
> def intro_area():
>     introselection = 0
>     print ' Welcome to Zombie Survival'
>     print ' It is a quite night in Egad, Wisconsin when..You suddenly
> awake'
>     print ' to the sounds from outside. You see sparks outside from your
> window.'
>     print ' The phone line has been cut. You have nothing to help you fend'
>     print ' of attackers. What will you do!!!'
>     print
>     print '1. Open the Front door?'
>     print '2. Go out the back door and towards the alley?'
>     while introselection < 1 or introselection > 2
>         print 'That area is unavaible please buy the expansion haha'
>     return introselection
>
> #This is the second area of the RPG
> def back_yard():
>     backyardselection = 0
>     print ' As you make your way out the back door, a Zombie appears from
> the'
>     print ' side of the yard. He is slowly making his way to you, and you
> have'
>     print ' to kill him to get to the alley. What course of action will you
> take.'
>     print
>     print '1.Fight the Zombie?'
>     print '2.Run Away?'
>     while backyardselection < 1 or backyardselection > 2:
>         print 'That is a unavailible course of action.'
>         #fight zombie
>     return backyardselection
>
> #The Alley No Zombie fight here
> def Alley():
>     alleyselection = 0
>     print 'After you killed the Zombie you begin to cautiously walk down
> the alley'
>     print 'looking for something to help you fend off anymore Zombies. When
> you'
>     print 'get near the end of the alley you find a baseball bat and a
> first aid'
>     print 'kit laying on the ground, You instinctifly pick up the bat and
> first'
>     print 'aid kit, You reach the end of the alley, and you look around for
> a'
>     print 'place to hide. Then you remeber about the forest beyond the
> police'
>     print 'station. What will you do?'
>     print
>     print '1.Run to the police station?'
>     print '2.Run to the grocery store?'
>     while alleyselection < 1 or alleyselection > 2:
>         print 'Theres a group of zombies over there!!'
>     return alleyselection
>
> #fight 2 Zombies here
> def police_station():
>     policeselection = 0
>     print 'You make your way down the street and avoid all the zombies.
> when you'
>     print 'reach the police station, The lights are flickering on and off.
> You see'
>     print 'couple people moving around on the inside. As you open the front
> door'
>     print 'the two zombies look at you and start heading torwards you. You
> raise'
>     print 'your bat and prepare to kill them. What will you do first?'
>     print
>     print '1.Stand your ground?'
>     print '2.Run back outside the door?'
>     while policeselection < 1 or policeselection > 2:
>         print 'Impossible please try again'
>     return policeselection
>         #fight 2 zombies
>
> #No Zombies here
> def police_backdoor():
>     policebackselection = 0
>     print 'You look down at the two zombies you just killed and see a gun.'
>     print 'You lean over and grab the gun and the ammo. Then you start to'
>     print 'look around and you notice another first aid kit, You walk over'
>     print 'there and patch yourself up. After your done you head towards
> the'
>     print 'back door. what will you do?'
>     print
>     print '1.Open the door?'
>     print '2.Go Home?'
>     while policebackselection < 1 or policebackselection > 2:
>         print 'Not possible'
>     return policebackselection
>
> #last area, boss is here
> def forest():
>     forestselection = 0
>     print 'You open the back door and you begin to walk out into the
> forest.'
>     print 'As your steping through the trees, you look ahead of you and
> you'
>     print 'see someone moving slowly towards you. As you focus you see
> that'
>     print 'its your old army buddy Jonas, You yell at him but he just
> keeps'
>     print 'moving towards you. You begin to notice that he is also a
> zombie'
>     print 'What will you do now?'
>     print
>     print '1.Draw your gun and kill Jonas?'
>     print '2.Go back into the police station?'
>     while forestselection < 1 or forestselection > 2:
>         print 'That option will be in the expansion lol'
>     return forestselection
>             #Fight Boss here
>
> #this is for the Ending
> def End():
>     endselection = 0
>     print 'You have completed the Zombie survival game.'
>     print
>     print '1. End Game'
>     print '2. Start Over'
>     while endselection < 1 or endselection > 2:
>         print 'Dont Taze me!!'
>     return endselection
>
> #this is for the start of the game
> def start():
>     startselection = 0
>     print '      Zombie Survial 1.0.1'
>     print
>     print '1. Start Game
>     print '2. End Game'
>             #if End game put rick roll'd there
>             #Survial Mode (only if i can get this finished)
>     while startselection < 1 or startselection > 2:
>         print 'Please enter a selection 1 or 2
>         startselection = input('Press 1 to start the game')
>     return startselection
>
> #This module is for the character creation at the beginning game and
> determines
> #how much health you have
> def character_creation():
>     charselection = 0
>     print '         Create your character'
>     print '1. Male'
>     print '2. Female'
>     print '3. Be a coward and Quit'
>     while charselection < 1 or charselection > 3:
>         print 'Please enter a selection 1-3'
>         charselection = input ('please inter gender')
>     return charselection
>
> #This module is for the monster named Zombie
> def Zombie():
>     ZHP = dice_roll2()
>     while ZHP > 0:
>     return ZHP
>
> #This is for the Boss named Jonas
> def Zombie_Boss():
>     ZBHP = dice_roll4()
>     while ZBHP > 0:
>     return ZBHP
>
> #specific for Zombie Boss HP
> def dice_roll4():
>     seed()
>     dice4 = random.randrange(4, 24, 1)
>     return dice4
>
> #This Module is for 2d6 sided dice
> def dice_roll2():
>     seed()
>     dice2 = random.randrange(2, 12, 1)
>     return dice2
>
> #This Module is for 1d6 sided dice
> def dice_roll():
>     seed()
>     dice = random.randrange(1, 6, 1)
>     return dice
>
> #weapons = fist, gun, baseball bat
> # for regular zombie
> #call fight(HP, ZHP, weapon)
> # for boss zombie
> #call fight(HP, ZBHP, weapon, True)
> def fight(HP, ZHP, weapon, boss=False):
>     if weapon == 'fist':
>         while HP > 0 and ZHP > 0:
>             damage = 2
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     elif weapon == 'baseball bat':
>         while HP > 0 and ZHP > 0:
>             damage = dice_roll()
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     else weapon == 'gun':
>         while HP > 0 and ZHP >0:
>             damge = dice_roll2()
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>
> #This module is used when you die
> def death(HP, ZHP, ZBHP):
>     if HP == 0:
>         print 'You have Died.'
>     elif ZHP == 0:
>         print 'You have killed the Zombie.'
>     elif ZBHP == 0:
>         print 'Right before you kill the Zombie, he runs off.'
>
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From Ron.Barak at lsi.com  Mon Feb 23 03:09:44 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 08:09:44 +0000
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>



> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Sunday, February 22, 2009 22:12
> To: Barak, Ron
> Cc: python-list at python.org
> Subject: Re: Is there a way to ask a class what its metaclasses are ?
>
> On Sun, Feb 22, 2009 at 5:14 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi Chris,
> <snip
> > Is there a way to ask a class what its metaclasses are ?
> > (e.g., how to ask wx.Frame what it's metaclass is)
>
> Of course. A metaclass is the type of a class, so it's just
> type(wx.Frame).
>
> Cheers,
> Chris

Thanks Chris.
When I try the following (to see the types of the classes involved):

#!/usr/bin/env python

import wx
from Debug import _line as line

class CopyAndPaste(object):
    def __init__(self, *args, **kwargs):
        super(CopyAndPaste, self).__init__(*args, **kwargs)
        print line()+". type(wx.Frame):",type(wx.Frame)
        print line()+". type(object):",type(object)

I get:

$ python -u CopyAndPaste.py
9. type(wx.Frame): <type 'type'>
10. type(object): <type 'type'>

And I don't understand what it means...
In any case, it does not seem to help me resolve the metaclasses exception.

Bye,
Ron.

>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
> >
> > I'm asking, because, even subclassing from object, viz.:
> >
> > class CopyAndPaste(object):
> >     def __init__(self):
> >         pass
> > ...
> >
> > Still gives me:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
> > last):
> >   File "./failover_pickle_demo09.py", line 321, in <module>
> >     class ListControlMeta(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> >     metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases
> >
> > Bye,
> > Ron.
>
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From alwaseem307ster at yahoo.com  Mon Feb 23 03:17:41 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 00:17:41 -0800 (PST)
Subject: pysqlite smart search
Message-ID: <22157116.post@talk.nabble.com>


 Hey guys;

I am trying to develop a tiny program using python to search inside sqlite
database with file extension is .db in which the program will ask users to
enter their search query and base on that it will retrieve the results But

I need the program to have some smartness in search mechanism in which the
program will guess that the user is looking for these key words in the
database.

so far i came up with this but the search ain't smart, i have to write the
full key word in order to retrieve specific information.

from pysqlite2 import dbapi2 as sqlite3

connection = sqlite3.connect('Photos.db')
memoryConnection = sqlite3.connect(':memory:')
cursor = connection.cursor()
prompt = 'Enter your search query?\n'
keyword = raw_input(prompt)
if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
print cursor.fetchall()
else:
cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
print cursor.fetchall()

Any ideas and
thanks in advance
Reply
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22157116.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From clp2 at rebertia.com  Mon Feb 23 03:21:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 00:21:35 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
Message-ID: <50697b2c0902230021v6a52db2eoc2218cf7bf835995@mail.gmail.com>

Ok, that's not a standard Python error report (I'm guessing you're
using an IDE of some sort).
Also, something's not right because your excerpt doesn't match the
source you posted.
In your previous post, the 'while' line in question was given as:

while introselection < 1 or introselection > 2

Note the missing semicolon. Whereas in your last message, you show it
with the semicolon.
Try running your program from the command line with Python and check
what error message it gives.
And ensure you give the /exact/ source if you have further questions.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


On Mon, Feb 23, 2009 at 12:08 AM, Tony <sternbrightblade at gmail.com> wrote:
> The full error message says "There's an error in your program: *** 'return'
> outside function (final(2).py, line 114)
>  which is were this return statement is..
>     while introselection < 1 or introselection > 2:
>         print 'That area is unavaible please buy the expansion haha'
>     return introselection
> On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:
>>
>> Hi,
>> I am trying to write a small program for my final for school, everytime i
>> run my program it gives me a return outside function error (after i fixed
>> all the indentation errors it throws at me), i am not very good at
>> programing with python atm, so any help would be appreiciated. and if im
>> missing somethign please feel free to throw
>> any suggestions out there.
>>
>> #This is a Text based RPG
>> # HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss
>> Hit Points
>> def fakemain(): #This is a place holder for me untill im ready to run the
>> program
>> start()
>>     startselection = start()
>>     if startselection == 1:
>>         character_creation()
>>     else:
>>         #end game (need the code to exit program)
>>
>>     charselection = character_creation()
>>     if charselection == 1:
>>         name = raw_input ('Please Enter Your Name')
>>         HP = dice_roll2()
>>         print 'Your HP is ',HP
>>     elif charselection == 2:
>>         name = raw_input ('Please Enter Your Name')
>>         HP = dice_roll()
>>         print 'Your HP is ',HP
>>     else:
>>
>> intro_area()
>>     introselection = intro_area()
>>     if introselection == 1:
>>         print 'A Zombie Attacks you'
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         intro_area()
>>     else:
>>         back_yard()
>>     backyardselection = back_yard()
>>     if backyardselection == 1:
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     else:
>>         print 'The Zombie leaps and reaches you before you shut the door.'
>>         print 'YOU HAVE DIED!!!'
>>             #reset the game (need the code to reset program)
>>
>> Alley()
>>     alleyselection = Alley()
>>     if alleyselection == 1:
>>         police_station()
>>     else:   #The object here is for the person to die if they select
>> option 2
>>         print 'As you try to get something to munch on 5 zombies attack
>> you'
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     policeselection = police_station()
>>     if policeselection == 1:
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     else:
>>         print 'The door mysteriously locked itself'
>>         police_station()
>> police_backdoor()
>>     policebackselection = police_backdoor()
>>     if policebackselection == 1:
>>         forest()
>>     else:
>>         print 'The Front Door is locked only way out is the backdoor'
>>         police_backdoor()
>>     forestselection = forest()
>>     if forestselection == 1:
>>         fight(HP, ZBHP, weapon, True)
>>         death(HP, ZHP, ZBHP)
>>         end()
>>     else:
>>         print 'Jonas reaches you before you get back and eats your brains'
>>         #End game
>>     endselection = end()
>>     if endselection == 1:
>>         #End program or play rick roll'd haha
>>     else:
>>         #reset program
>>
>> #This mod is the first area you are in
>> def intro_area():
>>     introselection = 0
>>     print ' Welcome to Zombie Survival'
>>     print ' It is a quite night in Egad, Wisconsin when..You suddenly
>> awake'
>>     print ' to the sounds from outside. You see sparks outside from your
>> window.'
>>     print ' The phone line has been cut. You have nothing to help you
>> fend'
>>     print ' of attackers. What will you do!!!'
>>     print
>>     print '1. Open the Front door?'
>>     print '2. Go out the back door and towards the alley?'
>>     while introselection < 1 or introselection > 2
>>         print 'That area is unavaible please buy the expansion haha'
>>     return introselection
>>
>> #This is the second area of the RPG
>> def back_yard():
>>     backyardselection = 0
>>     print ' As you make your way out the back door, a Zombie appears from
>> the'
>>     print ' side of the yard. He is slowly making his way to you, and you
>> have'
>>     print ' to kill him to get to the alley. What course of action will
>> you take.'
>>     print
>>     print '1.Fight the Zombie?'
>>     print '2.Run Away?'
>>     while backyardselection < 1 or backyardselection > 2:
>>         print 'That is a unavailible course of action.'
>>         #fight zombie
>>     return backyardselection
>>
>> #The Alley No Zombie fight here
>> def Alley():
>>     alleyselection = 0
>>     print 'After you killed the Zombie you begin to cautiously walk down
>> the alley'
>>     print 'looking for something to help you fend off anymore Zombies.
>> When you'
>>     print 'get near the end of the alley you find a baseball bat and a
>> first aid'
>>     print 'kit laying on the ground, You instinctifly pick up the bat and
>> first'
>>     print 'aid kit, You reach the end of the alley, and you look around
>> for a'
>>     print 'place to hide. Then you remeber about the forest beyond the
>> police'
>>     print 'station. What will you do?'
>>     print
>>     print '1.Run to the police station?'
>>     print '2.Run to the grocery store?'
>>     while alleyselection < 1 or alleyselection > 2:
>>         print 'Theres a group of zombies over there!!'
>>     return alleyselection
>>
>> #fight 2 Zombies here
>> def police_station():
>>     policeselection = 0
>>     print 'You make your way down the street and avoid all the zombies.
>> when you'
>>     print 'reach the police station, The lights are flickering on and off.
>> You see'
>>     print 'couple people moving around on the inside. As you open the
>> front door'
>>     print 'the two zombies look at you and start heading torwards you. You
>> raise'
>>     print 'your bat and prepare to kill them. What will you do first?'
>>     print
>>     print '1.Stand your ground?'
>>     print '2.Run back outside the door?'
>>     while policeselection < 1 or policeselection > 2:
>>         print 'Impossible please try again'
>>     return policeselection
>>         #fight 2 zombies
>>
>> #No Zombies here
>> def police_backdoor():
>>     policebackselection = 0
>>     print 'You look down at the two zombies you just killed and see a
>> gun.'
>>     print 'You lean over and grab the gun and the ammo. Then you start to'
>>     print 'look around and you notice another first aid kit, You walk
>> over'
>>     print 'there and patch yourself up. After your done you head towards
>> the'
>>     print 'back door. what will you do?'
>>     print
>>     print '1.Open the door?'
>>     print '2.Go Home?'
>>     while policebackselection < 1 or policebackselection > 2:
>>         print 'Not possible'
>>     return policebackselection
>>
>> #last area, boss is here
>> def forest():
>>     forestselection = 0
>>     print 'You open the back door and you begin to walk out into the
>> forest.'
>>     print 'As your steping through the trees, you look ahead of you and
>> you'
>>     print 'see someone moving slowly towards you. As you focus you see
>> that'
>>     print 'its your old army buddy Jonas, You yell at him but he just
>> keeps'
>>     print 'moving towards you. You begin to notice that he is also a
>> zombie'
>>     print 'What will you do now?'
>>     print
>>     print '1.Draw your gun and kill Jonas?'
>>     print '2.Go back into the police station?'
>>     while forestselection < 1 or forestselection > 2:
>>         print 'That option will be in the expansion lol'
>>     return forestselection
>>             #Fight Boss here
>> #this is for the Ending
>> def End():
>>     endselection = 0
>>     print 'You have completed the Zombie survival game.'
>>     print
>>     print '1. End Game'
>>     print '2. Start Over'
>>     while endselection < 1 or endselection > 2:
>>         print 'Dont Taze me!!'
>>     return endselection
>>
>> #this is for the start of the game
>> def start():
>>     startselection = 0
>>     print '      Zombie Survial 1.0.1'
>>     print
>>     print '1. Start Game
>>     print '2. End Game'
>>             #if End game put rick roll'd there
>>             #Survial Mode (only if i can get this finished)
>>     while startselection < 1 or startselection > 2:
>>         print 'Please enter a selection 1 or 2
>>         startselection = input('Press 1 to start the game')
>>     return startselection
>>
>> #This module is for the character creation at the beginning game and
>> determines
>> #how much health you have
>> def character_creation():
>>     charselection = 0
>>     print '         Create your character'
>>     print '1. Male'
>>     print '2. Female'
>>     print '3. Be a coward and Quit'
>>     while charselection < 1 or charselection > 3:
>>         print 'Please enter a selection 1-3'
>>         charselection = input ('please inter gender')
>>     return charselection
>>
>> #This module is for the monster named Zombie
>> def Zombie():
>>     ZHP = dice_roll2()
>>     while ZHP > 0:
>>     return ZHP
>>
>> #This is for the Boss named Jonas
>> def Zombie_Boss():
>>     ZBHP = dice_roll4()
>>     while ZBHP > 0:
>>     return ZBHP
>>
>> #specific for Zombie Boss HP
>> def dice_roll4():
>>     seed()
>>     dice4 = random.randrange(4, 24, 1)
>>     return dice4
>>
>> #This Module is for 2d6 sided dice
>> def dice_roll2():
>>     seed()
>>     dice2 = random.randrange(2, 12, 1)
>>     return dice2
>>
>> #This Module is for 1d6 sided dice
>> def dice_roll():
>>     seed()
>>     dice = random.randrange(1, 6, 1)
>>     return dice
>>
>> #weapons = fist, gun, baseball bat
>> # for regular zombie
>> #call fight(HP, ZHP, weapon)
>> # for boss zombie
>> #call fight(HP, ZBHP, weapon, True)
>> def fight(HP, ZHP, weapon, boss=False):
>>     if weapon == 'fist':
>>         while HP > 0 and ZHP > 0:
>>             damage = 2
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>     elif weapon == 'baseball bat':
>>         while HP > 0 and ZHP > 0:
>>             damage = dice_roll()
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>     else weapon == 'gun':
>>         while HP > 0 and ZHP >0:
>>             damge = dice_roll2()
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>
>> #This module is used when you die
>> def death(HP, ZHP, ZBHP):
>>     if HP == 0:
>>         print 'You have Died.'
>>     elif ZHP == 0:
>>         print 'You have killed the Zombie.'
>>     elif ZBHP == 0:
>>         print 'Right before you kill the Zombie, he runs off.'
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:23:25 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:23:25 -0200
Subject: different errors, return outside function and others
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 04:51:39 -0200, Tony <sternbrightblade at gmail.com>  
escribi?:

> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.

Is this your *actual* code? It does not even compile...
Things like 'def foo(...):' are *functions*, not *modules*.

Variables inside functions (including its arguments) are locals, private  
to the function. Even if you modify them, the "outside world" doesn't  
notice. So a function like this:

> def fight(HP, ZHP, weapon, boss=False):
>     if weapon == 'fist':
>         while HP > 0 and ZHP > 0:
>             damage = 2
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     elif weapon == 'baseball bat':
           [... more code ...]

won't alter the "global" values HP, ZHP; in fact, it won't do nothing.

Either return the new values:
    return HP, ZHP
and also adjust everywhere you call:
    HP, ZHP = fight(HP, ZHP, ...)

Or mark HP, ZHP as globals (using the global statement).

-- 
Gabriel Genellina



From clp2 at rebertia.com  Mon Feb 23 03:26:17 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 00:26:17 -0800
Subject: confusing UnboundLocalError behaive
In-Reply-To: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <50697b2c0902230026v7f3826adq6472412dc892ba03@mail.gmail.com>

On Mon, Feb 23, 2009 at 12:06 AM, neoedmund <neoedmund at gmail.com> wrote:
> see the 3 small piece of code, i cannot understand why it result as
> this.
>
> 1.
> def test():
>        abc="111"
>        def m1():
>                print(abc)
>        m1()
> test()
>
> Output: 111
>
> 2.
> def test():
>        abc="111"
>        def m1():

You need a 'nonlocal' declaration here (requires Python 3.0 I think).
See PEP 3104 for more info -- http://www.python.org/dev/peps/pep-3104/

>                print(abc)
>                abc+="222"
>        m1()
> test()
>
> Output:
>   print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment
>
> 3.
> def test2():
>        abc=[111]
>        def m1():
>                print(abc)
>                abc.append(222)
>        m1()
>        print(abc)
> test2()
>
> Output:
> [111]
> [111,222]
>
> it seems "you cannot change the outter scope values but can use it
> readonly."

Yeah, that's basically how nested scopes (sans 'nonlocal') work in
Python, since assignment typically constitutes an implicit scope
declaration.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:47:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:47:13 -0200
Subject: confusing UnboundLocalError behaive
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <op.upsqozbwx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:06:58 -0200, neoedmund <neoedmund at gmail.com>  
escribi?:

> it seems "you cannot change the outter scope values but can use it
> readonly."

Exactly.
Python doesn't have variable "declarations" - so the compiler uses this  
rule: "if the variable is assigned to, anywhere in the function body, it's  
local". This is done by static analysis when the code is compiled.

> 2.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 		abc+="222"
> 	m1()
> test()
>
> Output:
>    print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment

abc is assigned to, so it is local (and different from the abc in its  
enclosing scope). You can't print abc until it is assigned "something".

> 3.
> def test2():
> 	abc=[111]
> 	def m1():
> 		print(abc)
> 		abc.append(222)
> 	m1()
> 	print(abc)

No assignment to abc, so it's not local; print(abc) starts looking for it  
in all the enclosing scopes (up to the module global scope, and last, the  
builtin module).

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 04:02:46 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 09:02:46 GMT
Subject: confusing UnboundLocalError behaive
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <pan.2009.02.23.09.02.46@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 00:06:58 -0800, neoedmund wrote:

> see the 3 small piece of code, i cannot understand why it result as
> this.
> 
> 1.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 	m1()
> test()
> 
> Output: 111

abc is local to test(). print(abc) looks for a local abc, can't find one, 
and so searches the higher scope, and finds it there.



> 2.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 		abc+="222"
> 	m1()
> test()
> 
> Output:
>    print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment


Because you make an assignment to abc inside the m1() function, but 
didn't declare it as global, Python assumes that it must be a local 
variable. So when you try to print it, it doesn't have a value yet.

Solution: don't do that, or use the statement nonlocal (like global, 
except I think it is only introduced in Python 3.0).

 
> 3.
> def test2():
> 	abc=[111]
> 	def m1():
> 		print(abc)
> 		abc.append(222)
> 	m1()
> 	print(abc)
> test2()
> 
> Output:
> [111]
> [111,222]
> 
> it seems "you cannot change the outter scope values but can use it
> readonly."

But you're not using it read-only, because the append worked.

What you can't do is assign to the name.


Have a look at the disassembled code:

>>> import dis
>>> def spam():
...     print x
...     y = x+1
...
>>> dis.dis(spam)
  2           0 LOAD_GLOBAL              0 (x)
              3 PRINT_ITEM
              4 PRINT_NEWLINE

  3           5 LOAD_GLOBAL              0 (x)
              8 LOAD_CONST               1 (1)
             11 BINARY_ADD
             12 STORE_FAST               0 (y)
             15 LOAD_CONST               0 (None)
             18 RETURN_VALUE
>>>
>>> def ham():
...     print x
...     x = x+1
...
>>> dis.dis(ham)
  2           0 LOAD_FAST                0 (x)
              3 PRINT_ITEM
              4 PRINT_NEWLINE

  3           5 LOAD_FAST                0 (x)
              8 LOAD_CONST               1 (1)
             11 BINARY_ADD
             12 STORE_FAST               0 (x)
             15 LOAD_CONST               0 (None)
             18 RETURN_VALUE



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:07:38 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:07:38 -0200
Subject: pysqlite smart search
References: <22157116.post@talk.nabble.com>
Message-ID: <op.upsrm0zsx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:17:41 -0200, klia <alwaseem307ster at yahoo.com>  
escribi?:

> I need the program to have some smartness in search mechanism in which  
> the
> program will guess that the user is looking for these key words in the
> database.
>
> so far i came up with this but the search ain't smart, i have to write  
> the
> full key word in order to retrieve specific information.
>
> from pysqlite2 import dbapi2 as sqlite3
>
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()

That's pretty good. SQL wildcard is '%' so try using '... where Tag like  
?', ('%'+keyword+'%',)
Also, the return value of cursor.execute is undefined in PEP249, and  
fetchall is a connection method, not cursor's. (Although this may work  
with SQLite, if you later decide to switch to another database it would be  
inconvenient).

cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?', ('%'+keyword+'%',))
rows = cursor.fetchall()
if not rows:
   cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', (keyword,))
   rows = cursor.fetchall()
print rows

-- 
Gabriel Genellina



From sternbrightblade at gmail.com  Mon Feb 23 04:07:57 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 01:07:57 -0800
Subject: different errors, return outside function and others
In-Reply-To: <op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>

ok thank you for that input, this is my first class in programming and its
the only one the school offers. im pretty sure those are supposed to be
modules
that im writting. would it make a difference if those were modules and not
functions? kinda stupid question there but im trying to learn as much as
possible.
Also anything with def infront of it example def start(): would be a
function correct? also im Using 2.5 and the IDLE to do this

On Mon, Feb 23, 2009 at 12:23 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 23 Feb 2009 04:51:39 -0200, Tony <sternbrightblade at gmail.com>
> escribi?:
>
> Hi,
>> I am trying to write a small program for my final for school, everytime i
>> run my program it gives me a return outside function error (after i fixed
>> all the indentation errors it throws at me), i am not very good at
>> programing with python atm, so any help would be appreiciated. and if im
>> missing somethign please feel free to throw
>> any suggestions out there.
>>
>
> Is this your *actual* code? It does not even compile...
> Things like 'def foo(...):' are *functions*, not *modules*.
>
> Variables inside functions (including its arguments) are locals, private to
> the function. Even if you modify them, the "outside world" doesn't notice.
> So a function like this:
>
> def fight(HP, ZHP, weapon, boss=False):
>>    if weapon == 'fist':
>>        while HP > 0 and ZHP > 0:
>>            damage = 2
>>            ZHP = ZHP - damage
>>            if boss:
>>                HP = HP - dice_roll2()
>>            else:
>>                HP = HP - 2
>>    elif weapon == 'baseball bat':
>>
>          [... more code ...]
>
> won't alter the "global" values HP, ZHP; in fact, it won't do nothing.
>
> Either return the new values:
>   return HP, ZHP
> and also adjust everywhere you call:
>   HP, ZHP = fight(HP, ZHP, ...)
>
> Or mark HP, ZHP as globals (using the global statement).
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:21:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:21:53 -0200
Subject: Is there a way to ask a class what its metaclasses are ?
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
Message-ID: <op.upssarxhx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:09:44 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

>> > I'm asking, because, even subclassing from object, viz.:
>> >
>> > class CopyAndPaste(object):
>> >     def __init__(self):
>> >         pass
>> > ...
>> >
>> > Still gives me:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 321, in <module>
>> >     class ListControlMeta(wx.Frame, CopyAndPaste):
>> > TypeError: Error when calling the metaclass bases
>> >     metaclass conflict: the metaclass of a derived class must be a
>> > (non-strict) subclass of the metaclasses of all its bases

This works fine for me with Python 2.5 and wx 2.8.7.1; Python 2.4 and wx  
2.6.1.0; even if CopyAndPaste is an old-style class.

<code>
import wx

class CopyAndPaste(object):
   pass

class ListControl(wx.Frame, CopyAndPaste):
   pass

app = wx.App()
frame = ListControl(None)
frame.Show(True)
app.MainLoop()
</code>

You'll have to provide more info on your setup...

-- 
Gabriel Genellina



From nick at craig-wood.com  Mon Feb 23 04:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 23 Feb 2009 03:32:00 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9205.1234248235.3487.python-list@python.org>
	<d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>
	<64c334d7-434f-4ec3-8ccb-35e8088a0cb2@u13g2000yqg.googlegroups.com>
Message-ID: <slrngq4p5m.79l.nick@irishsea.home.craig-wood.com>

sturlamolden <sturlamolden at yahoo.no> wrote:
>  On Feb 10, 8:38?am, Paul McGuire <pt... at austin.rr.com> wrote:
> 
> > Even worse than linear, the function is recursive, which as I
> > understand it, is inherently a no-no when looking for code that is
> > parallel-friendly.
> 
>  There is no way to parallelize Fibonacci numbers computed with linear
>  time complexity, as we must know fib(n-1) to compute fib(n). But if we
>  were to use Oyster's recursive version, which has geometric
>  complexity, one could parallelize with a 'forkjoin' scheme.
> 
>  Anyhow, this runs in amortized linear time and would be a lot faster:
> 
>  def fib(n):
>     while True:
>        try:
>           return fib.seq[n]
>        except AttributeError:
>           fib.seq = [0, 1, 1]
>        except IndexError:
>           fib.seq.append( fib.seq[-2] +
>                            fib.seq[-1] )

Or something which runs in O(1)...

from gmpy import mpf, mpz, digits
from math import log, sqrt

root5_float = sqrt(5)
phi_float = (1 + root5_float) / 2
log_phi_float = log(phi_float)
log_root5_float = log(root5_float)
log2 = log(2)

def fibonacci_noniterative(n):
    """
    Work out n'th Fibonacci number in an noniterative fashion using Binet's formula
    """
    # Work out magnitude of answer
    bits = int(((n * log_phi_float - log_root5_float) / log2)*1.1)
    if bits < 0:
        bits = 0
    root5 = mpf(5, bits).sqrt()
    phi = (mpf(1, bits) + root5) / mpf(2, bits)
    f_n = phi**n / root5
    f_n = mpz(f_n + mpf(1, bits) / mpf(2, bits))
    return long(f_n)

It runs in O(1) if the O we are talking about is large integer
arithmetic.  It actually runs in more like O(log(n)**1.5) time.  It is
a lot faster than the iterative approach too which runs in
O(log(n)**2) for any n > ~40.

Times to calculate F(n)

         n,  iterative, noniterative
         1,   0.000003,   0.000016
         2,   0.000003,   0.000014
         4,   0.000003,   0.000012
         8,   0.000003,   0.000016
        16,   0.000004,   0.000009
        32,   0.000007,   0.000010
        64,   0.000014,   0.000010
       128,   0.000032,   0.000011
       256,   0.000072,   0.000014
       512,   0.000157,   0.000019
      1024,   0.000361,   0.000031
      2048,   0.000881,   0.000066
      4096,   0.002504,   0.000178
      8192,   0.007640,   0.000521
     16384,   0.025362,   0.001572
     32768,   0.090633,   0.004701
     65536,   0.342724,   0.014132
    131072,   1.335723,   0.045194
    262144,   5.273360,   0.111201
    524288,  20.791205,   0.301488
   1048576,  82.617938,   0.833644

Here is the rest of the program just in case anyone wants to play

def fibonacci_iterative(n):
    """
    Work out n'th Fibonacci number in an iterative fashion
    """
    a, b = 0, 1
    while n > 0:
        a, b = a + b, a
        n -= 1
    return a

if __name__ == "__main__":
    # warmup
    fibonacci_noniterative(100)
    print "         n,  iterative, noniterative"
    for e in range(30):
        i = 2 ** e
        t0 = time()
        f_iterative = fibonacci_iterative(i)
        t_iterative = time() - t0
        t0 = time()
        f_noniterative = fibonacci_noniterative(i)
        t_noniterative = time() - t0
        print "%10d, %10.6f, %10.6f" % (i, t_iterative, t_noniterative)
        if f_iterative != f_noniterative:
            print "Calculation error"
            print "iterative", f_iterative
            print "non iterative", f_noniterative
            print "difference", f_iterative-f_noniterative

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Ron.Barak at lsi.com  Mon Feb 23 04:32:52 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 09:32:52 +0000
Subject: Metaclass conflict TypeError exception: problem demonstration script
In-Reply-To: <20090222145717.787F04A136E@riobu.com>
References: <20090222145717.787F04A136E@riobu.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>

Hi Guys,

Thanks to Michele, Chris, Hrvoje et. al. who helped me trying to resolve the metaclass exception when a class has two parents problem.
This post tries to unify all the metaclasses exception threads, in an attempt to reach a solution.

I've created a short demo script (metaclass_test01.py) that demonstrate the problem.
Listings of metaclass_test01.py and CopyAndPaste are below and attached.

Note:

When line 8 in metaclass_test01.py is in effect (with line 7 commented out), the script runs normally.

However, when line 7 is in effect (with line 8 commented out), viz.:

$ cat -n metaclass_test01.py | head
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  class ListControl(wx.Frame, CopyAndPaste):
     8  #class ListControl(wx.Frame):
     9      def __init__(self, parent, id, title, list, max_list_width):
    10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)

I get the metaclass conflict exception:

$ python metaclass_test01.py
Traceback (most recent call last):
  File "metaclass_test01.py", line 7, in <module>
    class ListControl(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

I hope that now the problem is demonstrated more clearly, and the gurus out there could point me in the right direction towards a solution.

Bye,
Ron.

________________________________
$ cat -n metaclass_test01.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  #class ListControl(wx.Frame, CopyAndPaste):
     8  class ListControl(wx.Frame):
     9      def __init__(self, parent, id, title, list, max_list_width):
    10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)
    11          self.list = list
    12          self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT| wx.LC_NO_HEADER)
    13          self.list_ctrl.InsertColumn(0, title)
    14          for i,line_ in enumerate(list):
    15              self.list_ctrl.InsertStringItem(i, line_)
    16          self.list_ctrl.SetColumnWidth(0, max_list_width)
    17
    18          self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnItemSelected, self.list_ctrl)
    19
    20          self.Raise()
    21          self.Show(True)
    22
    23      def OnItemSelected(self, evt):
    24          item = evt.GetText()
    25          max_list_width = 10 * len(item)
    26          ListControl(self, -1, item, item, max_list_width)
    27
    28  if __name__ == "__main__":
    29      list = [   "First Line", "Second Line", "Third Line"]
    30      app = wx.App(redirect=False)
    31      max_list_width = 6 * max([len(x) for x in list])
    32      ListControl(None, -1, "Parent Window", list, max_list_width)
    33      app.MainLoop()
________________________________
$ cat -n CopyAndPaste.py
     1  #!/usr/bin/env python
     2
     3  import wx
     4
     5  class CopyAndPaste(object):
     6
     7      def __init__(self):
     8          pass
     9
    10      def set_copy_and_paste(self):
    11          """
    12          Setting clipboard copy-and-pasting (only copying from the application to the
    13          clipboard is supported).
    14          The "menu" menu is hidden, and is only there to facilitate the acceleration table.
    15          Both CTRL-C and CTRL-Ins are supported.
    16          """
    17          menu = wx.Menu()
    18          copy_ = menu.Append(-1, "&Copy\tCtrl-Ins") # Copy with accelerator
    19          minimize_ = menu.Append(-1, "Minimize") #
    20          close_ = menu.Append(-1, "Close window\tCtrl-W") # Close window
    21          exit_ = menu.Append(-1, "E&xit application\tCtrl-X") # Close window
    22
    23          self.Bind(wx.EVT_MENU, self.on_copy, copy_)
    24          self.Bind(wx.EVT_MENU, self.on_minimize, minimize_)
    25          self.Bind(wx.EVT_MENU, self.on_close, close_)
    26          self.Bind(wx.EVT_MENU, self.on_exit, exit_)
    27
    28          menuBar = wx.MenuBar()
    29          self.SetMenuBar(menuBar)
    30
    31          acceltbl = wx.AcceleratorTable( [
    32                  (wx.ACCEL_CTRL, ord('C'), copy_.GetId()),
    33                  (wx.ACCEL_CTRL, ord('W'), close_.GetId()),
    34                  (wx.ACCEL_CTRL, ord('X'), exit_.GetId()),
    35                  (wx.ACCEL_CTRL, ord('Q'), exit_.GetId()),
    36                  (wx.ACCEL_CTRL, wx.WXK_INSERT, copy_.GetId()),
    37                  (wx.ACCEL_CTRL, wx.WXK_NUMPAD_INSERT, copy_.GetId()),
    38              ])
    39          self.SetAcceleratorTable(acceltbl)
    40
    41          # Setting popup menu
    42
    43          self.popupmenu = menu
    44          self.Bind(wx.EVT_CONTEXT_MENU, self.on_show_popup)
    45
    46      def on_show_popup(self, evt):
    47          pos = evt.GetPosition()
    48          pos = self.list_ctrl.ScreenToClient(pos)
    49          self.PopupMenu(self.popupmenu, pos)
    50
    51      def get_data_for_clipboard(self,format="text"):
    52          """
    53          Return data ready to be copied to the clipboard.
    54
    55          This is an abstract method - concrete subclasses must override this.
    56
    57          Sample implementation of get_data_for_clipboard() is:
    58
    59          def get_data_for_clipboard(self,format="text"):
    60              first_selected = self.list_ctrl.GetFirstSelected()
    61              selected_item_count = self.list_ctrl.GetSelectedItemCount()
    62              text_for_clipboard = ""
    63              for i in range(first_selected,first_selected+selected_item_count):
    64                  text_for_clipboard = "%s%s\n" % (text_for_clipboard, self.list_ctrl.GetItemText(i))
    65              return(text_for_clipboard)
    66          """
    67          raise NotImplementedError
    68
    69      def on_copy(self, evt):
    70          """
    71          """
    72          text_for_clipboard = self.get_data_for_clipboard()
    73
    74          data = wx.TextDataObject()
    75          data.SetText(text_for_clipboard)
    76          if wx.TheClipboard.Open():
    77              wx.TheClipboard.SetData(data)
    78              wx.TheClipboard.Close()
    79          else:
    80              wx.MessageBox("Unable to copy to the clipboard", "Error")
    81
    82      def on_minimize(self, evt):
    83          self.Iconize()
    84
    85      def on_close(self, evt):
    86          self.Close()
    87
    88      def on_exit(self, evt):
    89          try:
    90              self.Parent.Close()
    91          except AttributeError:
    92              self.Close()
    93
    94
    95  if __name__ == "__main__":
    96
    97      app = wx.App(redirect=False)
    98      copy_and_paste = CopyAndPaste()
    99      app.MainLoop()
   100
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From mail at timgolden.me.uk  Mon Feb 23 04:36:36 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 23 Feb 2009 09:36:36 +0000
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <49A26E24.5060602@timgolden.me.uk>

> $ cat -n metaclass_test01.py | head
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste):
>      8  #class ListControl(wx.Frame):
>      9      def __init__(self, parent, id, title, list, max_list_width):
>     10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)
> 
> I get the metaclass conflict exception:


You're trying to use a module as a base class.
Don't do that; it doesn't work.

TJG


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:38:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:38:43 -0200
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <op.upss2tf6x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:32:52 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

> $ cat -n metaclass_test01.py | head
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste):
>      8  #class ListControl(wx.Frame):
>      9      def __init__(self, parent, id, title, list, max_list_width):
>     10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1),  
> style=wx.DEFAULT_FRAME_STYLE)
>
> I get the metaclass conflict exception:
>
> $ python metaclass_test01.py
> Traceback (most recent call last):
>   File "metaclass_test01.py", line 7, in <module>
>     class ListControl(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a  
> (non-strict) subclass of the metaclasses of all its bases
>
> I hope that now the problem is demonstrated more clearly, and the gurus  
> out there could point me in the right direction towards a solution.

You want the CopyAndPaste *class*, not the *module*!

-- 
Gabriel Genellina



From jonas.esp at googlemail.com  Mon Feb 23 04:40:47 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 01:40:47 -0800 (PST)
Subject: Access from class variable to one on constructor
Message-ID: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>

How to access from a class variable to one that is initialized on the
constructor?
--------------
class Foo():
  foo = bar  # I want to access *from here* to variables created on
the constructor.

  def __init__(self, bar_init):
    self.bar = bar_init
--------------

Note: I've to create a subclass where the parent class to get
variables using *for i in dir(self): * so it doesn't get variables
initialized on the constructor.


From stef.mientki at gmail.com  Mon Feb 23 04:57:05 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 10:57:05 +0100
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
Message-ID: <49A272F1.7090004@gmail.com>

thanks Ron,

but I was looking for a more general solution,
in which I don't change the program itself,
and where the error messages (in general) become more informative than 
it is by default.

cheers,
Stef


Barak, Ron wrote:
> Hi Stef,
>
> You can do something like (not tested):
>
> try: 
> 	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> except IndexError,e:
>                 msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
>                 print msg
>                 
> Bye,
> Ron.
> 	
>   
>> -----Original Message-----
>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>> Sent: Sunday, February 22, 2009 15:43
>> To: python-list at python.org
>> Subject: can error messages be improved or can they be overridden ?
>>
>> hello,
>>
>> I often get an error message like this
>>
>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>> IndexError: list index out of range
>>
>> Now it would be very welcome,
>> if the error message specified which index is out of range, 
>> in this case e.g.,
>> - specifying the length of self.EP
>> - specifying the value of self.EP[2]
>> - specifying the length of self.Brick.Par etc..
>>
>> Is there a way to override the error message and provide this 
>> information, or is it impossible ?
>>
>> And if it's possible, am I the only one who often stumbles 
>> about this problem ?
>> (I expect many people must have bounced in this problem before me ;-)
>>
>> thanks,
>> Stef Mientki
>>
>>
>>     



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:57:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:57:18 -0200
Subject: different errors, return outside function and others
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
	<ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>
Message-ID: <op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:07:57 -0200, Tony <sternbrightblade at gmail.com>  
escribi?:

> ok thank you for that input, this is my first class in programming and  
> its
> the only one the school offers. im pretty sure those are supposed to be
> modules
> that im writting. would it make a difference if those were modules and  
> not
> functions? kinda stupid question there but im trying to learn as much as
> possible.

Each module is a separate file, with extension .py
If you put all your code in a single file, you write a single module.  
That's fine in this case, unless it grows to something unmanageable.

Functions are blocks of code that have a name and "do" something specific,  
and usually return some result. They start with the keyword "def". You  
have defined several functions already, but called them "modules" in the  
comments, that's wrong and may be confusing.

> Also anything with def infront of it example def start(): would be a
> function correct? also im Using 2.5 and the IDLE to do this

Exactly!

I think you have written so much code without testing it. It's time to  
test every piece now. Start with... the start function, obviously!

But before, you have to clean your code. There are a few strange lines  
that should not be there (all those lines on the left margin that aren't  
"def" statements, like intro_area(), alley()...). Just remove or comment  
them.

Then you can start testing each function, one at a time. Simply call the  
function with the desired parameters (if any), right at the bottom of the  
file. To test the first one (start), use something like this:

print "about to call start()"
result = start()
print "start() finished, result=", result

and do the same for each individual function. Once you know each piece  
works fine, you can start combining them until you build the complete  
program.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 05:02:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 08:02:17 -0200
Subject: Access from class variable to one on constructor
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
Message-ID: <op.upst53y3x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.esp at googlemail.com>  
escribi?:

> How to access from a class variable to one that is initialized on the
> constructor?
> --------------
> class Foo():
>   foo = bar  # I want to access *from here* to variables created on
> the constructor.
>
>   def __init__(self, bar_init):
>     self.bar = bar_init
> --------------

Unless I misunderstand you, you can't do that. Class variables are shared  
by all instances and don't depend on a particular instance - they exist  
even *before* any instance is created.

> Note: I've to create a subclass where the parent class to get
> variables using *for i in dir(self): * so it doesn't get variables
> initialized on the constructor.

This part I don't understand at all. Perhaps a concrete example, showing  
what you actually want at the end?

-- 
Gabriel Genellina



From gabriel.rossetti at arimaz.com  Mon Feb 23 05:10:16 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 23 Feb 2009 11:10:16 +0100
Subject: shared lib from python code?
Message-ID: <49A27608.3050403@arimaz.com>

Hello everyone,

I would like to know if it is possible to turn python code into a shared 
lib? I have several processes that use the same base code, and it seems 
like every process loads the "shared" code into memory. I would like it 
to be loaded once and shared, like a .so in linux or a .dll in windows 
and have the interpreters use the dared copy. Is there a way to do this?

Thank you,
Gabriel


From jonas.esp at googlemail.com  Mon Feb 23 05:17:52 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:17:52 -0800 (PST)
Subject: Get variables on constructor
Message-ID: <0185d001-203d-4aa3-abe7-5674997f8428@t13g2000yqc.googlegroups.com>

To get class variables can be used *for i in dir(self): * but how to
get variables initialized on the constructor?


From http  Mon Feb 23 05:37:49 2009
From: http (Paul Rubin)
Date: 23 Feb 2009 02:37:49 -0800
Subject: shared lib from python code?
References: <mailman.510.1235383861.11746.python-list@python.org>
Message-ID: <7x63j1v3pe.fsf@ruckus.brouhaha.com>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> writes:
> I would like to know if it is possible to turn python code into a
> shared lib? I have several processes that use the same base code, and
> it seems like every process loads the "shared" code into memory. I
> would like it to be loaded once and shared, like a .so in linux or a
> .dll in windows and have the interpreters use the dared copy. Is there
> a way to do this?

I guess it's not completely inconceivable--Emacs used something called
unexec back in the day, that transmogrified part of its data segment
into the text segment and dumped it out as a runnable binary--but it
doesn't seem worth it nowadays, given how small your .pyc's are likely
to be relative to the size of memory.  If you're concerned about the
import overhead, maybe you can structure your program as a persistent
process instead of re-running it all the time.


From jonas.esp at googlemail.com  Mon Feb 23 05:38:30 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:38:30 -0800 (PST)
Subject: Get variables on constructor [Solved]
References: <0185d001-203d-4aa3-abe7-5674997f8428@t13g2000yqc.googlegroups.com>
Message-ID: <c1b17e76-8712-40cd-810a-de904ce40cd7@o36g2000yqh.googlegroups.com>

On 23 feb, 10:17, Kless <jonas.... at googlemail.com> wrote:
> To get class variables can be used *for i in dir(self): * but how to
> get variables initialized on the constructor?

Sorry. It's so simple as insert *self*.


From jonas.esp at googlemail.com  Mon Feb 23 05:48:19 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:48:19 -0800 (PST)
Subject: Access from class variable to one on constructor [Solved]
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
	<mailman.509.1235383504.11746.python-list@python.org>
Message-ID: <96d9815a-61c8-4745-94b8-532fd0489b7e@v42g2000yqj.googlegroups.com>

Thanks Gabriel. You have reason, and I was having a design error.

On 23 feb, 10:02, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.... at googlemail.com> ?
> escribi?:
>
> > How to access from a class variable to one that is initialized on the
> > constructor?
> > --------------
> > class Foo():
> > ? foo = bar ?# I want to access *from here* to variables created on
> > the constructor.
>
> > ? def __init__(self, bar_init):
> > ? ? self.bar = bar_init
> > --------------
>
> Unless I misunderstand you, you can't do that. Class variables are shared ?
> by all instances and don't depend on a particular instance - they exist ?
> even *before* any instance is created.
>
> > Note: I've to create a subclass where the parent class to get
> > variables using *for i in dir(self): * so it doesn't get variables
> > initialized on the constructor.
>
> This part I don't understand at all. Perhaps a concrete example, showing ?
> what you actually want at the end?
>
> --
> Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 05:48:49 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 08:48:49 -0200
Subject: shared lib from python code?
References: <49A27608.3050403@arimaz.com>
Message-ID: <op.upswbnytx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 08:10:16 -0200, Gabriel Rossetti  
<gabriel.rossetti at arimaz.com> escribi?:

> I would like to know if it is possible to turn python code into a shared  
> lib? I have several processes that use the same base code, and it seems  
> like every process loads the "shared" code into memory. I would like it  
> to be loaded once and shared, like a .so in linux or a .dll in windows  
> and have the interpreters use the dared copy. Is there a way to do this?

I don't think so.
What you consider "code" isn't usually just code: there are functions,  
classes, instances, constants, modules, docstrings... a myriad of objects.  
You can't share objects between processes.

Although true code objects are immutable and *could* be shared (with a lot  
of work), I don't think code objects actually could take so much memory as  
to be a problem.

-- 
Gabriel Genellina



From andrew at acooke.org  Mon Feb 23 06:14:34 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 08:14:34 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <21425a030186ab9c40012a19048b4f92.squirrel@localhost>

Steven D'Aprano wrote:
> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>
>> as far as i understand things, the best model is:
>>
>> 1 - everything is an object
>> 2 - everything is passed by reference
>
> Except that is wrong. If it were true, you could do this:
[pointer swapping]

i was thinking of how the stack is used; i would have called what you are
talking about "pointer semantics".  however, on reading around a little,
it seems that i'm in a very small minority (which is a pity, because if
you restrict the meaning to how values are handled on the stack then you
get a lot closer to having just values and references, rather than the
whole pile of different terms that are apparently in use).

sorry for the confusion,
andrew




From greg.ewing at canterbury.ac.nz  Mon Feb 23 06:31:29 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 24 Feb 2009 00:31:29 +1300
Subject: ANN: SuPy 1.5
Message-ID: <mailman.553.1235418492.11746.python-announce-list@python.org>

SuPy 1.5 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

New in this version:

- Tool and Observer classes can be implemented in Python
- Contextual menu facilities
- Modifier key and status bar constants
- to_length() function
- dir() works on Ruby classes


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From gabriel.rossetti at arimaz.com  Mon Feb 23 06:43:18 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 23 Feb 2009 12:43:18 +0100
Subject: shared lib from python code?
In-Reply-To: <49A27608.3050403@arimaz.com>
References: <49A27608.3050403@arimaz.com>
Message-ID: <49A28BD6.9040701@arimaz.com>

Gabriel Rossetti wrote:
> Hello everyone,
>
> I would like to know if it is possible to turn python code into a 
> shared lib? I have several processes that use the same base code, and 
> it seems like every process loads the "shared" code into memory. I 
> would like it to be loaded once and shared, like a .so in linux or a 
> .dll in windows and have the interpreters use the dared copy. Is there 
> a way to do this?
>
> Thank you,
> Gabriel
>
Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
don' t want to share code as in have multiple processes access a 
variable and have the same value, like it is done in threads, what I 
want is to not have n copies of the code (classes, functions, etc) 
loaded by n python interpreters. When you load Apache for instance, it 
runs n processes but loads only one copy of parts of it's code (so/dll), 
that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
so once the system has loaded it, it doesn' t re-load it when another 
process needs it.

Thank you,
Gabriel


From mark.dufour at gmail.com  Mon Feb 23 06:54:17 2009
From: mark.dufour at gmail.com (Mark Dufour)
Date: Mon, 23 Feb 2009 12:54:17 +0100
Subject: ANN: Shed Skin 0.1, an experimental (restricted-)Python-to-C++ 
	Compiler
Message-ID: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>

Hi all,

I have recently released version 0.1 of Shed Skin, an experimental
(restricted-)Python-to-C++ compiler.

Please see my blog for more info about the release:

http://shed-skin.blogspot.com


Thanks,
Mark Dufour.
-- 
"One of my most productive days was throwing away 1000 lines of code"
- Ken Thompson


From nytrokiss at gmail.com  Mon Feb 23 07:25:52 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Mon, 23 Feb 2009 14:25:52 +0200
Subject: ANN: Shed Skin 0.1, an experimental (restricted-)Python-to-C++ 
	Compiler
In-Reply-To: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>
References: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>
Message-ID: <8a6b8e350902230425x1176afa3ge7001e21013ce001@mail.gmail.com>

Nice! I was looking for one of these for a while

On Mon, Feb 23, 2009 at 1:54 PM, Mark Dufour <mark.dufour at gmail.com> wrote:

> Hi all,
>
> I have recently released version 0.1 of Shed Skin, an experimental
> (restricted-)Python-to-C++ compiler.
>
> Please see my blog for more info about the release:
>
> http://shed-skin.blogspot.com
>
>
> Thanks,
> Mark Dufour.
> --
> "One of my most productive days was throwing away 1000 lines of code"
> - Ken Thompson
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From ccormie at aussiemail.com.au  Mon Feb 23 07:41:20 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Mon, 23 Feb 2009 23:41:20 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
Message-ID: <01b28edb$0$20619$c3e8da3@news.astraweb.com>


> If that not-very-technical description [all I've ever needed] doesn't
> help, you'll need to read the DW help file (HTFF1K) or wait till
> someone who knows what they are doing comes along :-)

LOL, I am that person :p
Your technique works well and it does provide the information and it is 
a (roundabout) solution to this class of problems:  thank you very much. 
It doesn't answer the original question so I'll restate it:

How do you get *Python* to tell you the dll and the problem symbol? Not 
external tools, Python. Python at a low level is calling LoadLibrary and 
GetProcAddress to resolve symbols and the call fails. At that point it 
has the name of the dll and the problem symbol to hand and yet strangely 
only gives an opaque error message. How does one get Python to print out 
the faulty DLL and symbol?

(Even if it means a debug build of Python and adding the printf 
yourself, I just want to know where we stand on this issue! :) )

Best Regards,
Chris


From koranthala at gmail.com  Mon Feb 23 07:42:23 2009
From: koranthala at gmail.com (koranthala)
Date: Mon, 23 Feb 2009 04:42:23 -0800 (PST)
Subject: Server programming
Message-ID: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>

Hi,
      Is server programming in Python procedure oriented or object
oriented?
      I have this question because lately I am asked to make a medium
complex web program (extremely database oriented) using Django. When I
used to do application programs earlier (in Python itself), the whole
thing being object oriented came out easily in programming. So, I was
able to use different patterns etc for programming and the whole thing
was - quite fun to design and create.
      But when I program in Django, since I just have to work on user
responses - everything else being taken care of by Django - only, the
complete coding has become procedure oriented. It is not kludgy or
anything, but it doesnt have the nice feeling that we get when we code
a proper object oriented program.
      Is my coding in error here? This is infact my first web program,
so it might be the reason. What does other people find? Does web
server programming using web frameworks (Django, TurboGears etc) make
it procedure oriented? If I am in the wrong, it might be due to a
wrong design or mindset, and I would like to change it.




From see_website at mindprod.com.invalid  Mon Feb 23 07:56:54 2009
From: see_website at mindprod.com.invalid (Roedy Green)
Date: Mon, 23 Feb 2009 04:56:54 -0800
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
	<kfbtyi.45w@spenarnc.xs4all.nl>
Message-ID: <n375q4d933h748c5bnpfjrbcrvdilvn7vt@4ax.com>

On 19 Feb 2009 18:56:42 GMT, Albert van der Horst
<albert at spenarnc.xs4all.nl> wrote, quoted or indirectly quoted someone
who said :

>Note here, that eXtreme
>>Programing is one of the snake oil,

Extreme programming is a variant on Deming's idea of constant
incremental improvement that revolutionised quality in manufacturing.

It is also based on the obvious idea that you will be smarter after
you have used some version of a program than you are today. There are
so many computer programs perfectly compliant with specs that looked
good on paper but nobody ever tested with actual use to refine them
until the project was "complete" and it was too expensive to fix them.


-- 
Roedy Green Canadian Mind Products
http://mindprod.com

One path leads to despair and utter hopelessness. The other, 
to total extinction. Let us pray we have the wisdom to choose correctly. 
~ Woody Allen .


From alwaseem307ster at yahoo.com  Mon Feb 23 08:03:13 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 05:03:13 -0800 (PST)
Subject: pysqlite smart search
In-Reply-To: <22157116.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com>
Message-ID: <22161119.post@talk.nabble.com>




klia wrote:
> 
>  Hey guys;
> 
> I am trying to develop a tiny program using python to search inside sqlite
> database with file extension is .db in which the program will ask users to
> enter their search query and base on that it will retrieve the results But
> 
> I need the program to have some smartness in search mechanism in which the
> program will guess that the user is looking for these key words in the
> database.
> 
> so far i came up with this but the search ain't smart, i have to write the
> full key word in order to retrieve specific information.
> 
> from pysqlite2 import dbapi2 as sqlite3
> 
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()
> 
> Any ideas and
> thanks in advance
> Reply
> 

thank you man, it worked perfectly but one more thing;

when i print rows it retrieves the whole rows of info which i don't need, i
need just to retrieve the name of the photo. 
so how am i gonna do that?
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22161119.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From sjmachin at lexicon.net  Mon Feb 23 08:05:49 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 23 Feb 2009 05:05:49 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>

On Feb 23, 11:41?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> > If that not-very-technical description [all I've ever needed] doesn't
> > help, you'll need to read the DW help file (HTFF1K) or wait till
> > someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p

It wasn't apparent, and still isn't.

> Your technique works well and it does provide the information and it is
> a (roundabout) solution to this class of problems: ?thank you very much.
> It doesn't answer the original question so I'll restate it:
>
> How do you get *Python* to tell you the dll and the problem symbol? Not
> external tools, Python. Python at a low level is calling LoadLibrary and
> GetProcAddress to resolve symbols and the call fails. At that point it
> has the name of the dll and the problem symbol to hand and yet strangely
> only gives an opaque error message. How does one get Python to print out
> the faulty DLL and symbol?

If you know all that, then the answer is to submit a patch, isn't it??


> (Even if it means a debug build of Python and adding the printf
> yourself,

printf? Maybe you shouldn't submit a patch after all.



From duncan.booth at invalid.invalid  Mon Feb 23 08:09:15 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 23 Feb 2009 13:09:15 GMT
Subject: shared lib from python code?
References: <49A27608.3050403@arimaz.com>
	<mailman.514.1235389443.11746.python-list@python.org>
Message-ID: <Xns9BBB84727E289duncanbooth@127.0.0.1>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> wrote:

> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
> don' t want to share code as in have multiple processes access a 
> variable and have the same value, like it is done in threads, what I 
> want is to not have n copies of the code (classes, functions, etc) 
> loaded by n python interpreters. When you load Apache for instance, it 
> runs n processes but loads only one copy of parts of it's code (so/dll), 
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
> so once the system has loaded it, it doesn' t re-load it when another 
> process needs it.
> 

It doesn't matter how you restate it, the answer is still the one Gabriel 
Genellina gave you: Python code objects are not shared between processes.

Code objects are immutable, but they are still objects like everything else 
in Python. That means they are reference counted and discarded when no 
longer referenced.

To share code objects between different processes you would have to change 
the reference counting mechanism so it was either safe across multiple 
processes or didn't reference count shared code objects (but still ref 
counted non-shared objects).

The actual code is just stored in a string, so perhaps you could share 
those strings between processes: just executing the code doesn't change the 
string's refcount (whereas it does change the function and the code 
objects' counts). You could probably make something work simply by editing 
the code constructor to move the code into shared memory and using some 
other mechanism to control the shared memory storage.

C extension libraries on the other hand may be shared.

-- 
Duncan Booth http://kupuguy.blogspot.com


From deets at nospam.web.de  Mon Feb 23 08:10:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 14:10:49 +0100
Subject: shared lib from python code?
In-Reply-To: <mailman.514.1235389443.11746.python-list@python.org>
References: <49A27608.3050403@arimaz.com>
	<mailman.514.1235389443.11746.python-list@python.org>
Message-ID: <70flipF47gafU1@mid.uni-berlin.de>

Gabriel Rossetti schrieb:
> Gabriel Rossetti wrote:
>> Hello everyone,
>>
>> I would like to know if it is possible to turn python code into a 
>> shared lib? I have several processes that use the same base code, and 
>> it seems like every process loads the "shared" code into memory. I 
>> would like it to be loaded once and shared, like a .so in linux or a 
>> .dll in windows and have the interpreters use the dared copy. Is there 
>> a way to do this?
>>
>> Thank you,
>> Gabriel
>>
> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
> don' t want to share code as in have multiple processes access a 
> variable and have the same value, like it is done in threads, what I 
> want is to not have n copies of the code (classes, functions, etc) 
> loaded by n python interpreters. When you load Apache for instance, it 
> runs n processes but loads only one copy of parts of it's code (so/dll), 
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
> so once the system has loaded it, it doesn' t re-load it when another 
> process needs it.

This is not done, and most probably won't ever happen. What would you do 
with this?

import random
import foo


if random.random() > .5:
    foo.some_function = lambda x: x ** 2
else:
    foo.some_function = lambda x: x + 2


If the module foo would be shared amongst processes, these would affect 
the code of each other. Not so nice.

Of course one could try & cough up some read-only, copy-on-modify 
scheme, but that would be hard, if not impossible - and for rather 
minimal gains. Take a look at the compiled *.pyc-files (which should 
pretty much represent the memory they consume) - they are in the kbytes. 
So optimizing here would be a waste I'd say.


Diez


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 08:49:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 11:49:59 -0200
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <op.ups4plvzx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 10:41:20 -0200, Chris Cormie  
<ccormie at aussiemail.com.au> escribi?:

>> If that not-very-technical description [all I've ever needed] doesn't
>> help, you'll need to read the DW help file (HTFF1K) or wait till
>> someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p
> Your technique works well and it does provide the information and it is  
> a (roundabout) solution to this class of problems:  thank you very much.  
> It doesn't answer the original question so I'll restate it:
>
> How do you get *Python* to tell you the dll and the problem symbol? Not  
> external tools, Python. Python at a low level is calling LoadLibrary and  
> GetProcAddress to resolve symbols and the call fails. At that point it  
> has the name of the dll and the problem symbol to hand and yet strangely  
> only gives an opaque error message. How does one get Python to print out  
> the faulty DLL and symbol?

You can't, because it isn't Python who's trying to load the symbol - the  
*only* symbol that Python attempts to import itself is "initFOO" from  
FOO.pyd, and when that fails you get an explicit message.
The error you see must come from the extension itself, and propagates into  
Python as an ImportError.

-- 
Gabriel Genellina



From venutaurus539 at gmail.com  Mon Feb 23 08:51:36 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 05:51:36 -0800 (PST)
Subject: opening files with names in non-english characters.
Message-ID: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>

Hi all,
          I am trying to find the attributes of afile whose name has
non english characters one like given below. When I try to run my
python scirpt, it fails giving out an error filename must be in string
or UNICODE. When i try to copy the name of the file as a strinig, it
(KOMODO IDE) is not allowing me to save the script saying that it
cannot convert some of the characters in the current encoding which is
Western European(CP-1252).

0010testUnicode_???????????????????? !#$%&'()+,-.
0123456789;=@ABCD.txt.txt

            Hope some one could help me in this regard.

Thank you in advance,

Venu Madhav


From cwitts at gmail.com  Mon Feb 23 08:51:44 2009
From: cwitts at gmail.com (Chris)
Date: Mon, 23 Feb 2009 05:51:44 -0800 (PST)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com> 
	<mailman.507.1235383028.11746.python-list@python.org>
Message-ID: <bbbd9c93-e6c8-41f9-8c59-ab8d27fb98fa@v18g2000vbb.googlegroups.com>

On Feb 23, 11:57?am, Stef Mientki <stef.mien... at gmail.com> wrote:
> thanks Ron,
>
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than
> it is by default.
>
> cheers,
> Stef
>
> Barak, Ron wrote:
> > Hi Stef,
>
> > You can do something like (not tested):
>
> > try:
> > ? ?self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> > except IndexError,e:
> > ? ? ? ? ? ? ? ? msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
> > ? ? ? ? ? ? ? ? print msg
>
> > Bye,
> > Ron.
>
> >> -----Original Message-----
> >> From: Stef Mientki [mailto:stef.mien... at gmail.com]
> >> Sent: Sunday, February 22, 2009 15:43
> >> To: python-l... at python.org
> >> Subject: can error messages be improved or can they be overridden ?
>
> >> hello,
>
> >> I often get an error message like this
>
> >> ? ? self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> >> IndexError: list index out of range
>
> >> Now it would be very welcome,
> >> if the error message specified which index is out of range,
> >> in this case e.g.,
> >> - specifying the length of self.EP
> >> - specifying the value of self.EP[2]
> >> - specifying the length of self.Brick.Par etc..
>
> >> Is there a way to override the error message and provide this
> >> information, or is it impossible ?
>
> >> And if it's possible, am I the only one who often stumbles
> >> about this problem ?
> >> (I expect many people must have bounced in this problem before me ;-)
>
> >> thanks,
> >> Stef Mientki
>
>

Why not something like this ?  I know it requires changing your
application
but tbh I don't see any other way.

try:
    self.Brick.Par [ self.EP[2] ]['FileName'] = filename
except IndexError, msg:
    try:
        v = self.EP[2]
        try:
            v = self.Brick.Par[v]
        except IndexError:
            v = 'self.Brick.Par[%s] is out of range'%v
    except IndexError:
        v = 'self.EP[2] is out of range'
    raise IndexError(msg.message, v)


From hniksic at xemacs.org  Mon Feb 23 08:53:01 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 23 Feb 2009 14:53:01 +0100
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com> (Ron
	Barak's message of "Mon\, 23 Feb 2009 09\:32\:52 +0000")
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <87k57h8dky.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> However, when line 7 is in effect (with line 8 commented out), viz.:
>
> $ cat -n metaclass_test01.py | head
>   1  #!/usr/bin/env python
>   2
>   3  import sys
>   4  import wx
>   5  import CopyAndPaste
>   6
>   7  class ListControl(wx.Frame, CopyAndPaste):

If this is the actual source you're running, then CopyAndPaste is a
module, not a type, and that causes the conflict.  Use
CopyAndPaste.CopyAndPaste, or change the import line to read "from
CopyAndPaste import CopyAndPaste".  Or, even better, adhere to
recommendations laid down in PEP 8 and you'll avoid confusion between
module and class names.


From andrew at acooke.org  Mon Feb 23 09:00:32 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 11:00:32 -0300 (CLST)
Subject: shared lib from python code?
In-Reply-To: <49A28BD6.9040701@arimaz.com>
References: <49A27608.3050403@arimaz.com> <49A28BD6.9040701@arimaz.com>
Message-ID: <89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>

Gabriel Rossetti wrote:
> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I
> don' t want to share code as in have multiple processes access a
> variable and have the same value, like it is done in threads, what I
> want is to not have n copies of the code (classes, functions, etc)
> loaded by n python interpreters. When you load Apache for instance, it
> runs n processes but loads only one copy of parts of it's code (so/dll),
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll),
> so once the system has loaded it, it doesn' t re-load it when another
> process needs it.

i think i understand what you want.  the problem is that the kind of
language that python is really doesn't work well with that kind of
approach.  this is (and i may be wrong - i've not really thought much
about this before) largely because python places a very strong emphasis on
late binding.  that means that everything is very flexible - all kinds of
things can be changed "under the hood".  and that means that it is very
difficult to share things safely because almost any solution would end up
doing what you don't want (sharing variables, like with threads (even
though they are very deeply buried variables)) rather than what you do
want (just sharing the static part of the code to save space).

another way to see this is to see the connection with security.  this is
the flip side of your case - because things are so flexible it is very
hard to run some python code in a "sandbox" in a larger python program. 
there's some discussion on the dev group at the moment and it looks like
the solution is to only use function closures.  but even that doesn't work
without some patches that remove certain ways to dynamically alter the
code base.

andrew




From goodz158 at yahoo.com  Mon Feb 23 09:02:54 2009
From: goodz158 at yahoo.com (Good Z)
Date: Mon, 23 Feb 2009 06:02:54 -0800 (PST)
Subject: Getting Certification Chain from Digital Signature
Message-ID: <352443.74170.qm@web35901.mail.mud.yahoo.com>

All,  
I need to extract certification chain/private key from digital signature certificate (DSC). The Digital Signature (DSC) is in PFX file format. I got the Java code but do not know the python equivalent in python.

Any help will be appreciated.
Best Regards,
Mike



      
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From sion at paintbox.UUCP  Mon Feb 23 09:11:58 2009
From: sion at paintbox.UUCP (S Arrowsmith)
Date: 23 Feb 2009 14:11:58 GMT
Subject: count secton of data in list
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
	<mailman.386.1235173577.11746.python-list@python.org>
	<3ed253bb-d6ec-4f47-af08-ad193e9c46e3@h16g2000yqj.googlegroups.com>
Message-ID: <kfivfy.db9@paintbox.UUCP>

In article <3ed253bb-d6ec-4f47-af08-ad193e9c46e3 at h16g2000yqj.googlegroups.com>,
odeits  <odeits at gmail.com> wrote:
>def count_consecutive(rows):
>    switch =3D 0
>    count =3D 0
>    for r in rows:
>        if r[-1] =3D=3D switch:
>            count +=3D 1
>        else:
>            switch =3D not switch
>            if count !=3D 0:
>                yield count
>                count =3D 0
>    if count !=3D 0:
>        yield count
>
>rows = [ ... ]
>
>for cnt in count_consecutive(rows):
>    print cnt

import itertools, operator

for k, g in itertools.groupby(rows, operator.itemgetter(3):
    print len(list(g))

-- 
\S

   under construction



From freelancer317 at gmail.com  Mon Feb 23 10:02:51 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Mon, 23 Feb 2009 10:02:51 -0500
Subject: pysqlite smart search
In-Reply-To: <22161119.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com> <22161119.post@talk.nabble.com>
Message-ID: <b1d973a70902230702k703c52b1qc44327c1a2b041de@mail.gmail.com>

2009/2/23 klia <alwaseem307ster at yahoo.com>

>
>
>
> klia wrote:
> >
> >  Hey guys;
> >
> > I am trying to develop a tiny program using python to search inside
> sqlite
> > database with file extension is .db in which the program will ask users
> to
> > enter their search query and base on that it will retrieve the results
> But
> >
> > I need the program to have some smartness in search mechanism in which
> the
> > program will guess that the user is looking for these key words in the
> > database.
> >
> > so far i came up with this but the search ain't smart, i have to write
> the
> > full key word in order to retrieve specific information.
> >
> > from pysqlite2 import dbapi2 as sqlite3
> >
> > connection = sqlite3.connect('Photos.db')
> > memoryConnection = sqlite3.connect(':memory:')
> > cursor = connection.cursor()
> > prompt = 'Enter your search query?\n'
> > keyword = raw_input(prompt)
> > if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> > print cursor.fetchall()
> > else:
> > cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> > print cursor.fetchall()
> >
> > Any ideas and
> > thanks in advance
> > Reply
> >
>
> thank you man, it worked perfectly but one more thing;
>
> when i print rows it retrieves the whole rows of info which i don't need, i
> need just to retrieve the name of the photo.
> so how am i gonna do that?


It depends on the structure of your table, but you're going to have to
change the following lines:
>if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
>cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
* indicates all fields in the selected records, so you need to
change the * to the field that contains the name of the photo.  For example:
if cursor.execute('SELECT name FROM photos WHERE Tag LIKE ?',[keyword]):

--
> View this message in context:
> http://www.nabble.com/pysqlite-smart-search-tp22157116p22161119.html
> Sent from the Python - python-list mailing list archive at Nabble.com.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
- Bret
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From Ron.Barak at lsi.com  Mon Feb 23 10:23:23 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 15:23:23 +0000
Subject: Solved: Metaclass conflict TypeError exception: problem
	demonstration script
In-Reply-To: <49A26E24.5060602@timgolden.me.uk>
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
	<49A26E24.5060602@timgolden.me.uk>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>

Hi,

> -----Original Message-----
> From: Tim Golden [mailto:mail at timgolden.me.uk]
> Sent: Monday, February 23, 2009 11:37
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: Metaclass conflict TypeError exception: problem
> demonstration script
>
> > $ cat -n metaclass_test01.py | head
> >      1  #!/usr/bin/env python
> >      2
> >      3  import sys
> >      4  import wx
> >      5  import CopyAndPaste
> >      6
> >      7  class ListControl(wx.Frame, CopyAndPaste):
> >      8  #class ListControl(wx.Frame):
> >      9      def __init__(self, parent, id, title, list,
> max_list_width):
> >     10
> wx.Frame.__init__(self,parent,id,title,size=(-1,-1),
> style=wx.DEFAULT_FRAME_STYLE)
> >
> > I get the metaclass conflict exception:
>
>
> You're trying to use a module as a base class.
> Don't do that; it doesn't work.
>
> TJG
>
>

That's it.

Once I changed my class header to:

$ cat -n metaclass_test01.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  class ListControl(wx.Frame, CopyAndPaste.CopyAndPaste):

I'm getting no more Metaclass conflict TypeError exceptions   :-)
(a clear case of "The Devil Is In The ...")

Thanks so much,
Ron.
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From mail at timgolden.me.uk  Mon Feb 23 10:28:02 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 23 Feb 2009 15:28:02 +0000
Subject: Solved: Metaclass conflict TypeError exception: problem
	demonstration script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>
References: <20090222145717.787F04A136E@riobu.com>	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
	<49A26E24.5060602@timgolden.me.uk>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>
Message-ID: <49A2C082.4050608@timgolden.me.uk>

Barak, Ron wrote:
> That's it.
> 
> Once I changed my class header to:
> 
> $ cat -n metaclass_test01.py
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste.CopyAndPaste):
> 
> I'm getting no more Metaclass conflict TypeError exceptions   :-)
> (a clear case of "The Devil Is In The ...")



Glad we could help. Also a good indication of how important it
is to produce real code which really fails in the real way!
Sometimes you can look at it yourself even before you post
and see the problem.

:)

TJG


From deets at nospam.web.de  Mon Feb 23 10:49:01 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 16:49:01 +0100
Subject: pysqlite smart search
In-Reply-To: <mailman.517.1235394196.11746.python-list@python.org>
References: <22157116.post@talk.nabble.com>
	<mailman.517.1235394196.11746.python-list@python.org>
Message-ID: <70furdF4guqjU1@mid.uni-berlin.de>

klia schrieb:
> 
> 
> klia wrote:
>>  Hey guys;
>>
>> I am trying to develop a tiny program using python to search inside sqlite
>> database with file extension is .db in which the program will ask users to
>> enter their search query and base on that it will retrieve the results But
>>
>> I need the program to have some smartness in search mechanism in which the
>> program will guess that the user is looking for these key words in the
>> database.
>>
>> so far i came up with this but the search ain't smart, i have to write the
>> full key word in order to retrieve specific information.
>>
>> from pysqlite2 import dbapi2 as sqlite3
>>
>> connection = sqlite3.connect('Photos.db')
>> memoryConnection = sqlite3.connect(':memory:')
>> cursor = connection.cursor()
>> prompt = 'Enter your search query?\n'
>> keyword = raw_input(prompt)
>> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
>> print cursor.fetchall()
>> else:
>> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
>> print cursor.fetchall()
>>
>> Any ideas and
>> thanks in advance
>> Reply
>>
> 
> thank you man, it worked perfectly but one more thing;
> 
> when i print rows it retrieves the whole rows of info which i don't need, i
> need just to retrieve the name of the photo. 
> so how am i gonna do that?

select <columnname> ...

instead of

select *


Diez


From xahlee at gmail.com  Mon Feb 23 10:54:48 2009
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 23 Feb 2009 07:54:48 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com> 
	<kfbtyi.45w@spenarnc.xs4all.nl>
	<n375q4d933h748c5bnpfjrbcrvdilvn7vt@4ax.com>
Message-ID: <67b81919-4e73-4943-a6bc-5863e9a93a3a@j39g2000yqn.googlegroups.com>

On Feb 23, 4:56 am, Roedy Green <see_webs... at mindprod.com.invalid>
wrote:
> On 19 Feb 2009 18:56:42 GMT, Albert van der Horst
> <alb... at spenarnc.xs4all.nl> wrote, quoted or indirectly quoted someone
> who said :
>
> >Note here, that eXtreme
> >>Programing is one of the snake oil,
>
> Extreme programming is a variant on Deming's idea of constant
> incremental improvement that revolutionised quality in manufacturing.
>
> It is also based on the obvious idea that you will be smarter after
> you have used some version of a program than you are today. There are
> so many computer programs perfectly compliant with specs that looked
> good on paper but nobody ever tested with actual use to refine them
> until the project was "complete" and it was too expensive to fix them.

2009-02-09

Today, i happened to run across a blog on the eXtreme Programing
FUCK.
http://www.yosefk.com/blog/extreme-programming-explained.html

Great article!

  Xah
$B-t(B http://xahlee.org/



From john.ionides at gmail.com  Mon Feb 23 11:09:23 2009
From: john.ionides at gmail.com (John Ionides)
Date: Mon, 23 Feb 2009 08:09:23 -0800 (PST)
Subject: ZSI / MTOM
Message-ID: <1fd305a1-d087-4902-83ba-780e97bd042f@m24g2000vbp.googlegroups.com>

I have project for which I would like to have a python web service
including MTOM. It seems that ZSI is the most complete python web
service library but that it doesn't currently support MTOM - and
having worked through the code it looks as though it isn't going to be
exactly simple. Is there anyone working on a patch (or interested in
collaborating if it comes down to writing one)?

John


From schlaber at gmail.com  Mon Feb 23 11:13:53 2009
From: schlaber at gmail.com (Brot)
Date: Mon, 23 Feb 2009 08:13:53 -0800 (PST)
Subject: charset problems with urllib/urllib2
Message-ID: <a671c473-b576-4ebe-9aeb-48ac886d1323@s14g2000vbp.googlegroups.com>

Hello,

I am using the mailman-installation (http://www.gnu.org/software/
mailman/) from my hosting company. I doesn't have access to the
add_members script and so I am writing a python script which uses http
requests to subscribe new members.

But if I am posting a new member with an name, which includes "German
Umlaute" I see only weird characters in the admin-interface.
The mailman webinterface doesn't use utf-8. It always uses the
corresponding charset for the actual language setting.
If I post "B?rbel R?ssel" the admin-interface shows me the following
name: "B??rbel R??ssel"
I am using the German language setting, so mailman uses the ISO-8559-1
charset in the webinterface. If I switch my browser to UTF-8 the name
is correct in the admin-interface, but all other special characters
are wrong.

The strange thing for me is, that the name is correct if I subscribe
the member in the admin-interface manually. I don't know what the
different is between my python script and the manuell subscription.

To Post to my mailman-server I use this recipe (http://
code.activestate.com/recipes/146306/) to generate the
multipart/form-data POST

I looked into the Mailman source code and found the Util.canonstr
method. At the end it changes the string to an unicode string. So the
name is stored as unicode, isn't it? But why is there a difference if
I display the manuell inserted name and the automatic inserted name??

I used Tamper Data (https://addons.mozilla.org/en-US/firefox/addon/
966) to catch the request when I inserted the data manually through
the webinterface. The request generated with my script looks the same,
but the output isn't?

Does anyone have experience with this problem or with mailman and
urllib/urllib2?

~ Bernd


From tjreedy at udel.edu  Mon Feb 23 11:51:17 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 11:51:17 -0500
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
Message-ID: <gnuk64$c6$1@ger.gmane.org>

Tony wrote:
> The full error message says "There's an error in your program: *** 
> 'return' outside function (final(2).py, line 114)

Ah, you left the quotes off before, and you still omitted the error 
class (SyntaxError, see below).

When you are puzzled by an error, try to reduce the executed code to the 
MINIMUN needed to get the error.  (You can use your editor's block 
comment feature -- for IDLE see Format/Comment out [marked] region.)
For your error, the minimum is

 >>> return
SyntaxError: 'return' outside function (<pyshell#1>, line 1)

Return statements are only value inside functions and not in module 
level code.  Perhaps you think you 'return' is in a function but it is 
not because it is not indented.

Terry Jan Reedy



From aquil.abdullah at gmail.com  Mon Feb 23 11:53:20 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 08:53:20 -0800 (PST)
Subject: A tale of two execs
Message-ID: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>

Hello All,
  I am working on a project where I need to support versions of Python
as old as 2.3. Previously, we distributed Python with our product, but
this seemed a bit silly so we are no longer doing this.  The problem
that I am faced with is that we have Python scripts that use the
subprocess module, and subprocess is not available in Python 2.3.
Below is the strategy I am thinking about using, however if, you have
better ideas please let me know.

def runner(cmd, stdin, stdout, ...):
  try:
    import subprocess
    sbm = 1
  except:
    sbm = 0

  # Now do something
  if sbm:
    process = subporcess(...)
  else:
    import popen2
    process = popen2.Popen4(...)

Has anyone else run into a situation similar to this one?


From zelegolas at gmail.com  Mon Feb 23 11:55:38 2009
From: zelegolas at gmail.com (zelegolas)
Date: Mon, 23 Feb 2009 08:55:38 -0800 (PST)
Subject: Python Imaging Library (PIL): create PDF from scratch
Message-ID: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>

Hi,

I have some scan generated by SANE and i would like to do some
transformation (like crop, brightness and resize) and finaly put all
those images in PDF file.

With PIL i can do all the transformations that i want. But i don't
know how i can create from scratch a PDF. I'm not even sure that PIL
is the right library for that.

Any help/informations will be appreciate


From bieffe62 at gmail.com  Mon Feb 23 12:06:25 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 23 Feb 2009 09:06:25 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>

On Feb 23, 5:53?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? I am working on a project where I need to support versions of Python
> as old as 2.3. Previously, we distributed Python with our product, but
> this seemed a bit silly so we are no longer doing this. ?The problem
> that I am faced with is that we have Python scripts that use the
> subprocess module, and subprocess is not available in Python 2.3.
> Below is the strategy I am thinking about using, however if, you have
> better ideas please let me know.
>
> def runner(cmd, stdin, stdout, ...):
> ? try:
> ? ? import subprocess
> ? ? sbm = 1
> ? except:
> ? ? sbm = 0
>
> ? # Now do something
> ? if sbm:
> ? ? process = subporcess(...)
> ? else:
> ? ? import popen2
> ? ? process = popen2.Popen4(...)
>
> Has anyone else run into a situation similar to this one?

IIRC,  subprocess is a pure python module. If so, tou could try if
subprocess compiles under 2.3.
If so, or if it has easily fixable problems, you could rename it as
someting like 'backported_subprocess.py'
and include it in your app, which then should do:

try:
   import subprocess
except ImportError:
   import backported_subprocess as subprocess

This should minimize the change at your code. Of course if the usage
of subprocess is restricted
to few functions, your approach to provide two alternative
implementations of those function
is also workable. However, check if/when the module popen2, which is
deprecated, is planned for
remioval, otherwise you will have the same problem later.

HTH

Ciao
------
FB


From mnordhoff at mattnordhoff.com  Mon Feb 23 12:07:04 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Mon, 23 Feb 2009 17:07:04 +0000
Subject: A tale of two execs
In-Reply-To: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <49A2D7B8.2000106@mattnordhoff.com>

aha wrote:
> Hello All,
>   I am working on a project where I need to support versions of Python
> as old as 2.3. Previously, we distributed Python with our product, but
> this seemed a bit silly so we are no longer doing this.  The problem
> that I am faced with is that we have Python scripts that use the
> subprocess module, and subprocess is not available in Python 2.3.
> Below is the strategy I am thinking about using, however if, you have
> better ideas please let me know.
> 
> def runner(cmd, stdin, stdout, ...):
>   try:
>     import subprocess
>     sbm = 1
>   except:
>     sbm = 0
> 
>   # Now do something
>   if sbm:
>     process = subporcess(...)
>   else:
>     import popen2
>     process = popen2.Popen4(...)
> 
> Has anyone else run into a situation similar to this one?

FWIW, the Mercurial project went the other way: They wrote "popen2",
"popen3" and "Popen3" functions that were wrappers around subprocess:

<http://selenic.com/repo/hg-stable/file/dd970a311ea8/mercurial/util.py#l52>
-- 


From phillip.oldham at gmail.com  Mon Feb 23 12:12:20 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Mon, 23 Feb 2009 09:12:20 -0800 (PST)
Subject: Python shell scripting and errors
Message-ID: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>

I've got a python script running as a daemon (using someone else's
daemon module). It runs fine for a while, but will occasionally balk
and die. Since its running in the background, I'm getting no error
from it.

What's the best way to capture the output into a file for later review?


From ethan at stoneleaf.us  Mon Feb 23 12:16:38 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 23 Feb 2009 09:16:38 -0800
Subject: ANN: Python dBase 0.84.18 released!
Message-ID: <49A2D9F6.2060906@stoneleaf.us>

This module is designed to work with dBase III and Visual FoxPro 6.0 dbf 
files, along with their memo files.  Index files are not supported.

The table header is read into memory, table data is read into memory on 
first record access; field updates are immediately written to disk.

Documentation will be improved as time permits.

Current web location is http://groups.google.com/group/python-dbase.

My apologies for the extremely bare-bones web site.
--
~Ethan~


From tim.wintle at teamrubber.com  Mon Feb 23 12:21:51 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 17:21:51 +0000
Subject: Python shell scripting and errors
In-Reply-To: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
Message-ID: <1235409711.12946.31.camel@tim-laptop>

On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
> I've got a python script running as a daemon (using someone else's
> daemon module). It runs fine for a while, but will occasionally balk
> and die. Since its running in the background, I'm getting no error
> from it.
> 
> What's the best way to capture the output into a file for later review?

Point standard out to an open file handle?



From bieffe62 at gmail.com  Mon Feb 23 12:28:44 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 23 Feb 2009 09:28:44 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>
Message-ID: <652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>

On Feb 23, 6:06?pm, bieff... at gmail.com wrote:
> On Feb 23, 5:53?pm, aha <aquil.abdul... at gmail.com> wrote:
>
>
>
>
>
> > Hello All,
> > ? I am working on a project where I need to support versions of Python
> > as old as 2.3. Previously, we distributed Python with our product, but
> > this seemed a bit silly so we are no longer doing this. ?The problem
> > that I am faced with is that we have Python scripts that use the
> > subprocess module, and subprocess is not available in Python 2.3.
> > Below is the strategy I am thinking about using, however if, you have
> > better ideas please let me know.
>
> > def runner(cmd, stdin, stdout, ...):
> > ? try:
> > ? ? import subprocess
> > ? ? sbm = 1
> > ? except:
> > ? ? sbm = 0
>
> > ? # Now do something
> > ? if sbm:
> > ? ? process = subporcess(...)
> > ? else:
> > ? ? import popen2
> > ? ? process = popen2.Popen4(...)
>
> > Has anyone else run into a situation similar to this one?
>
> IIRC, ?subprocess is a pure python module. If so, tou could try if
> subprocess compiles under 2.3.

...

I checked, and, for windows platform subprocess.py uses the modules
mvscrt and _subprocess, which I ham unable to
locate on my windows XP python 2.6 installation. This make the whole
thing harder, even impossible if _subprocess has
been created especially for subprocess.py.

For non-windows platform, subprocess.py seem to use only fairly well-
established module, so there is a chance to backport it.

Ciao again
----------
FB


From tjreedy at udel.edu  Mon Feb 23 12:29:16 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 12:29:16 -0500
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
Message-ID: <gnumdb$97p$1@ger.gmane.org>

Barak, Ron wrote:
> 

> When I try the following (to see the types of the classes involved):
> 
> #!/usr/bin/env python
> 
> import wx
> from Debug import _line as line
> 
> class CopyAndPaste(object):
>     def __init__(self, *args, **kwargs):
>         super(CopyAndPaste, self).__init__(*args, **kwargs)
>         print line()+". type(wx.Frame):",type(wx.Frame)
>         print line()+". type(object):",type(object)
> 
> I get:
> 
> $ python -u CopyAndPaste.py
> 9. type(wx.Frame): <type 'type'>
> 10. type(object): <type 'type'>
> 
> And I don't understand what it means...

The default metaclass is named 'type'.  It it the class of all builtin 
classes and all user classes (3.0) that do not specify otherwise. 
Behind the scenes, new user classes are created as instances of 'type' 
by the equivalent of 'type(name, bases, class_dict)'.  What is possibly 
confusing is that the __call__ method of 'type' also allows calls to 
type with only one arg, in which case it returns the class of the arg 
instead of trying to create a new class.  And so one might mistakenly 
think that 'type' is a built-in function rather than a class.

Terry Jan Reedy



From philip at semanchuk.com  Mon Feb 23 12:34:53 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 12:34:53 -0500
Subject: Python shell scripting and errors
In-Reply-To: <1235409711.12946.31.camel@tim-laptop>
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
	<1235409711.12946.31.camel@tim-laptop>
Message-ID: <90DA12C5-AC31-4747-AEBA-4952BAFFC02B@semanchuk.com>


On Feb 23, 2009, at 12:21 PM, Tim Wintle wrote:

> On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
>> I've got a python script running as a daemon (using someone else's
>> daemon module). It runs fine for a while, but will occasionally balk
>> and die. Since its running in the background, I'm getting no error
>> from it.
>>
>> What's the best way to capture the output into a file for later  
>> review?
>
> Point standard out to an open file handle?

And stderr.

I don't know how the OP's daemon is being launched, but the crontab  
command below worked for me for redirecting errors to a log file  
without the need to modify the script.

python /usr/local/foo/bar.py >> /var/log/foo/bar.txt 2>&1



HTH
Philip


From steve at holdenweb.com  Mon Feb 23 12:45:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 12:45:57 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <gnuncn$bjh$1@ger.gmane.org>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
> <steven at remove.this.cybersource.com.au> wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>> Except that is wrong. If it were true, you could do this:
>>
>> def swap(x, y):
>>    y, x = x, y
>>
>> a = 1
>> b = 2
>> swap(a, b)
>> assert a == 2 and b == 1
>>
>>
>> but you can't, it does not work. Ergo, parameter passing in Python does
>> not have the same semantics as languages that use pass-by-reference, such
>> as Pascal and Basic. That means that even if you can justify the claim
>> "Python is pass-by-reference" by some technical argument (and I don't
>> believe you can), it is misleading to make that claim without further
>> qualifications.
> 
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable. The objects *do* get passed by
> reference; the function doesn't receive a new copy of the object and
> it can examine the original object's ID. The actual culprit is not the
> way objects are passed but the assignment operator, since it works by
> rebinding names (as Andrew Koenig explained) and not by changing the
> object itself. If the swap() function could somehow access the
> underlying integer object and modify it, swapping of values would
> indeed occur because the function *did* get references to the objects
> passed to it.
> 
> That said, it's a rather convoluted way of explaining what happens and
> calling it pass-by-object feels much better. :-)
> 
The underlying point is that there is no way to rebind names in the
caller's namespace by manipulations of parameters passed as arguments to
a function.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Mon Feb 23 12:54:03 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 23 Feb 2009 17:54:03 +0000 (UTC)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com>
Message-ID: <gnunrq$eov$1@ger.gmane.org>

Stef Mientki <stef.mientki at gmail.com> wrote:
> thanks Ron,
> 
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than 
> it is by default.
[snip]
> >> -----Original Message-----
> >> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
[snip]
> >> I often get an error message like this
> >>
> >>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> >> IndexError: list index out of range
> >>
> >> Now it would be very welcome,
> >> if the error message specified which index is out of range, 
> >> in this case e.g.,
> >> - specifying the length of self.EP
> >> - specifying the value of self.EP[2]
> >> - specifying the length of self.Brick.Par etc..
> >>
> >> Is there a way to override the error message and provide this 
> >> information, or is it impossible ?
> >>
> >> And if it's possible, am I the only one who often stumbles 
> >> about this problem ?
> >> (I expect many people must have bounced in this problem before me ;-)

FYI, top posts are much harder to read and to reply to than if you edit
the message to which you are replying and add your new content interleaved
or at the bottom (as I have done).

No you are not the only one who wishes the error messages were
more informative.  In one complex application I had, I made my life
easier with a hack I copied from Zope.  Briefly, at the top level
of the program I trap all exceptions, get the traceback object from
sys.exc_info, format it with format_tb, and then process it to add info.
I applied several enhancements, but the one relevant to you was to grab
the locals dictionary from the last frame of the traceback, and use a
regex to split the last source line in the formatted traceback up into
candidate variable names.  Then I printed the name and the repr of the
value of any of those names I found in the locals dict.

That wouldn't tell you directly which variable it was threw the index
error, but having the current values of the variables involved saves a
lot of time (no need to go back and stick in prints in many cases).

(You know, I really ought to revisit that routine and make it part
of my standard development toolbox.)

--RDM



From steve at holdenweb.com  Mon Feb 23 12:57:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 12:57:05 -0500
Subject: Server programming
In-Reply-To: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
References: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
Message-ID: <gnuo1j$eil$1@ger.gmane.org>

koranthala wrote:
> Hi,
>       Is server programming in Python procedure oriented or object
> oriented?
>       I have this question because lately I am asked to make a medium
> complex web program (extremely database oriented) using Django. When I
> used to do application programs earlier (in Python itself), the whole
> thing being object oriented came out easily in programming. So, I was
> able to use different patterns etc for programming and the whole thing
> was - quite fun to design and create.
>       But when I program in Django, since I just have to work on user
> responses - everything else being taken care of by Django - only, the
> complete coding has become procedure oriented. It is not kludgy or
> anything, but it doesnt have the nice feeling that we get when we code
> a proper object oriented program.
>       Is my coding in error here? This is infact my first web program,
> so it might be the reason. What does other people find? Does web
> server programming using web frameworks (Django, TurboGears etc) make
> it procedure oriented? If I am in the wrong, it might be due to a
> wrong design or mindset, and I would like to change it.
> 
It's just that Django *seems* procedure-oriented because your views are
written as functions. But they take request objects as arguments and
return response objects as results, so the framework is object-oriented.
Also each model is a class, and querysets eventually yield lists of
instances.

I wouldn't worry too much until Django forces you to do somethign you
really don't want to do ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 13:00:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 13:00:08 -0500
Subject: Python Imaging Library (PIL): create PDF from scratch
In-Reply-To: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
Message-ID: <gnuo7a$eil$2@ger.gmane.org>

zelegolas wrote:
> Hi,
> 
> I have some scan generated by SANE and i would like to do some
> transformation (like crop, brightness and resize) and finaly put all
> those images in PDF file.
> 
> With PIL i can do all the transformations that i want. But i don't
> know how i can create from scratch a PDF. I'm not even sure that PIL
> is the right library for that.
> 
PIL is great for graphics, but I use ReportLab's open source stuff (see
www.reportlab.org) for creating PDFs - that's what it was designed for,
and you can easily incorporate your graphics.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Mon Feb 23 13:00:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 15:00:37 -0300 (CLST)
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <gnunrq$eov$1@ger.gmane.org>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
Message-ID: <9afda87e04d99d252c989c08ade7699f.squirrel@acooke.dyndns.org>

rdmurray at bitdance.com wrote:
[...]
> (You know, I really ought to revisit that routine and make it part
> of my standard development toolbox.)

please post it....

andrew



From clp2 at rebertia.com  Mon Feb 23 13:02:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 10:02:50 -0800
Subject: opening files with names in non-english characters.
In-Reply-To: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902231002k28b4f2dfs4b4bbf38e569511f@mail.gmail.com>

On Mon, Feb 23, 2009 at 5:51 AM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> Hi all,
>          I am trying to find the attributes of afile whose name has
> non english characters one like given below. When I try to run my
> python scirpt, it fails giving out an error filename must be in string
> or UNICODE. When i try to copy the name of the file as a strinig, it
> (KOMODO IDE) is not allowing me to save the script saying that it
> cannot convert some of the characters in the current encoding which is
> Western European(CP-1252).
>
> 0010testUnicode_???????????????????? !#$%&'()+,-.
> 0123456789;=@ABCD.txt.txt

(1) How are you entering or retrieving that filename?
(2) Please provide the exact error and Traceback you're getting.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 13:05:55 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:05:55 -0700
Subject: unescape escapes in strings
Message-ID: <gnuoi3$jat$1@news.motzarella.org>


When reading lines of data from a file in the from (no quotes!)

	foo\x20bar

and I assign to a variable in a line line like:

  f = file('infile', 'r')
  for a in f:
     print a

the string is read in as string with the literal characters 'f', 'o' ... 
'x' , '2' ...

as compared to an assignment like:

  a="foo\x20bar"

which is identical to

a="foo bar"

Okay, so far ... I think this is what I want since my program is using 
space characters as delimiters and I'm trying to use the \x20 notation 
to avoid splitting.

But, now the problem. When I finally assign the string with the \x20 to 
a variable the literals are still there. And here I really want them all 
nicely converted to the desired values.

So, the question is: is there an "unescape()" for strings so that 
"foo\x20bar" is converted to "foo bar"????


From google at mrabarnett.plus.com  Mon Feb 23 13:22:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 18:22:51 +0000
Subject: unescape escapes in strings
In-Reply-To: <gnuoi3$jat$1@news.motzarella.org>
References: <gnuoi3$jat$1@news.motzarella.org>
Message-ID: <49A2E97B.4010209@mrabarnett.plus.com>

bvdp wrote:
> 
> When reading lines of data from a file in the from (no quotes!)
> 
>     foo\x20bar
> 
> and I assign to a variable in a line line like:
> 
>  f = file('infile', 'r')
>  for a in f:
>     print a
> 
> the string is read in as string with the literal characters 'f', 'o' ... 
> 'x' , '2' ...
> 
> as compared to an assignment like:
> 
>  a="foo\x20bar"
> 
> which is identical to
> 
> a="foo bar"
> 
> Okay, so far ... I think this is what I want since my program is using 
> space characters as delimiters and I'm trying to use the \x20 notation 
> to avoid splitting.
> 
> But, now the problem. When I finally assign the string with the \x20 to 
> a variable the literals are still there. And here I really want them all 
> nicely converted to the desired values.
> 
> So, the question is: is there an "unescape()" for strings so that 
> "foo\x20bar" is converted to "foo bar"????
> 
 >>> a = r"foo\x20bar"
 >>> print a
foo\x20bar
 >>> a = a.decode("string-escape")
 >>> print a
foo bar



From bnsilinux at gmail.com  Mon Feb 23 13:29:46 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 10:29:46 -0800 (PST)
Subject: Which GROUP to join ?
Message-ID: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>

hello, I have written a parameter driven menuing and screen system for
S-Lang called SLAG.  It is very intuitive and easy to use and was
designed to rapidly build Accounting Applications with.

I am currently working on porting it to Python.

Which DEV group in Python should I join to get help and ask
questions ?


Thanks

Ben Duncan


From robert.kern at gmail.com  Mon Feb 23 13:33:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 23 Feb 2009 12:33:41 -0600
Subject: Which GROUP to join ?
In-Reply-To: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
References: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
Message-ID: <gnuq65$n7t$1@ger.gmane.org>

On 2009-02-23 12:29, Ben wrote:
> hello, I have written a parameter driven menuing and screen system for
> S-Lang called SLAG.  It is very intuitive and easy to use and was
> designed to rapidly build Accounting Applications with.
>
> I am currently working on porting it to Python.
>
> Which DEV group in Python should I join to get help and ask
> questions ?

This one. Welcome!

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From kyosohma at gmail.com  Mon Feb 23 13:34:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 23 Feb 2009 10:34:16 -0800 (PST)
Subject: Which GROUP to join ?
References: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
Message-ID: <fcdc155e-efca-4889-805d-059c32b03263@r24g2000vbp.googlegroups.com>

On Feb 23, 12:29?pm, Ben <bnsili... at gmail.com> wrote:
> hello, I have written a parameter driven menuing and screen system for
> S-Lang called SLAG. ?It is very intuitive and easy to use and was
> designed to rapidly build Accounting Applications with.
>
> I am currently working on porting it to Python.
>
> Which DEV group in Python should I join to get help and ask
> questions ?
>
> Thanks
>
> Ben Duncan

You don't need to join the dev groups unless you plan to contribute to
their respective projects. For general questions, this is probably the
best place. Most other projects (such as Sqlalchemy, wxPython, django)
have their own specific lists. Join them as needed.

Mike


From bob at mellowood.ca  Mon Feb 23 13:35:35 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:35:35 -0700
Subject: unescape escapes in strings
In-Reply-To: <mailman.535.1235413372.11746.python-list@python.org>
References: <gnuoi3$jat$1@news.motzarella.org>
	<mailman.535.1235413372.11746.python-list@python.org>
Message-ID: <gnuq9n$7gp$1@news.motzarella.org>

MRAB wrote:
> bvdp wrote:
>>
>> When reading lines of data from a file in the from (no quotes!)
>>
>>     foo\x20bar
>>
>> and I assign to a variable in a line line like:
>>
>>  f = file('infile', 'r')
>>  for a in f:
>>     print a
>>
>> the string is read in as string with the literal characters 'f', 'o' 
>> ... 'x' , '2' ...
>>
>> as compared to an assignment like:
>>
>>  a="foo\x20bar"
>>
>> which is identical to
>>
>> a="foo bar"
>>
>> Okay, so far ... I think this is what I want since my program is using 
>> space characters as delimiters and I'm trying to use the \x20 notation 
>> to avoid splitting.
>>
>> But, now the problem. When I finally assign the string with the \x20 
>> to a variable the literals are still there. And here I really want 
>> them all nicely converted to the desired values.
>>
>> So, the question is: is there an "unescape()" for strings so that 
>> "foo\x20bar" is converted to "foo bar"????
>>
>  >>> a = r"foo\x20bar"
>  >>> print a
> foo\x20bar
>  >>> a = a.decode("string-escape")
>  >>> print a
> foo bar
> 

Thanks ... I think in my original testing I tried decode() but it didn't 
work. Testing more ...

  the file has 2 lines:
   foo bar
   foo\x20bar

and the program to read is:
f=file('in', 'r')
for a in f:
     a = a.strip()
     a=a.decode()
     print list(a)

I get:

python read.py
[]
[u'f', u'o', u'o', u' ', u'b', u'a', u'r']
[u'f', u'o', u'o', u'\\', u'x', u'2', u'0', u'b', u'a', u'r']

So, the \x20 is still literal.

Any other ideas??? I suppose I could write a re expression ... but 
surely that is not needed???



From stef.mientki at gmail.com  Mon Feb 23 13:37:17 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 19:37:17 +0100
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <gnunrq$eov$1@ger.gmane.org>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>
	<gnunrq$eov$1@ger.gmane.org>
Message-ID: <49A2ECDD.8040600@gmail.com>

rdmurray at bitdance.com wrote:
> Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>> thanks Ron,
>>
>> but I was looking for a more general solution,
>> in which I don't change the program itself,
>> and where the error messages (in general) become more informative than 
>> it is by default.
>>     
> [snip]
>   
>>>> -----Original Message-----
>>>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>>>>         
> [snip]
>   
>>>> I often get an error message like this
>>>>
>>>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>>>> IndexError: list index out of range
>>>>
>>>> Now it would be very welcome,
>>>> if the error message specified which index is out of range, 
>>>> in this case e.g.,
>>>> - specifying the length of self.EP
>>>> - specifying the value of self.EP[2]
>>>> - specifying the length of self.Brick.Par etc..
>>>>
>>>> Is there a way to override the error message and provide this 
>>>> information, or is it impossible ?
>>>>
>>>> And if it's possible, am I the only one who often stumbles 
>>>> about this problem ?
>>>> (I expect many people must have bounced in this problem before me ;-)
>>>>         
>
> FYI, top posts are much harder to read and to reply to than if you edit
> the message to which you are replying and add your new content interleaved
> or at the bottom (as I have done).
>   
??? I read that before, but I can't understand it.
I think that depends totally on the mail reader you use (although I 
don't know any mail reader that scrolls to the bottom).
I use Thunderbird, which opens every message at the top,
so top posting is the best readable for me,
I don't have to scroll (assuming that I know from previous readings the 
content of the previous message).
Replying can be preset in any reader I know just as you like, bottom or top.
So I guess there must be another reason, why some (or maybe even 
everyone except me)  don't prefer top posting.
> No you are not the only one who wishes the error messages were
> more informative.  In one complex application I had, I made my life
> easier with a hack I copied from Zope.  Briefly, at the top level
> of the program I trap all exceptions, get the traceback object from
> sys.exc_info, format it with format_tb, and then process it to add info.
> I applied several enhancements, but the one relevant to you was to grab
> the locals dictionary from the last frame of the traceback, and use a
> regex to split the last source line in the formatted traceback up into
> candidate variable names.  Then I printed the name and the repr of the
> value of any of those names I found in the locals dict.
>
> That wouldn't tell you directly which variable it was threw the index
> error, but having the current values of the variables involved saves a
> lot of time (no need to go back and stick in prints in many cases).
>
> (You know, I really ought to revisit that routine and make it part
> of my standard development toolbox.)
>
>   
well that sound good,
but contains a lot of suggestions with which I'm not familiar.
Could please post some code snippets ?

thanks,
Stef Mientki
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From tjreedy at udel.edu  Mon Feb 23 13:40:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 13:40:39 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A272F1.7090004@gmail.com>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com>
Message-ID: <gnuqj6$oob$1@ger.gmane.org>

Stef Mientki wrote:
> thanks Ron,
> 
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than 
> it is by default.

Improving error messages is an ongoing project.  I submitted feature request
http://bugs.python.org/issue5353
Improve IndexError messages with actual values

We can only hope someone will get 'bugged' to write a patch.

Terry




From python.list at tim.thechases.com  Mon Feb 23 13:43:44 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 12:43:44 -0600
Subject: Peculiar swap behavior
Message-ID: <49A2EE60.1060300@tim.thechases.com>

I stumbled across this oddity and was hoping folks on the list 
might be able to provide a little understanding:

# swap scalars
 >>> x,y = 1,2
 >>> x,y = y,x
 >>> x,y
(2, 1)

# swap lists
 >>> a,b = [1,2,3],[4,5,6]
 >>> a,b = b,a
 >>> a,b
([4, 5, 6], [1, 2, 3])

# swap list contents...not so much...
 >>> m,n = [1,2,3],[4,5,6]
 >>> m[:],n[:] = n,m
 >>> m,n
([4, 5, 6], [4, 5, 6])


The first two work as expected but the 3rd seems to leak some 
internal abstraction.  It seems to work if I force content-copying:

 >>> m[:],n[:] = n[:],m[:]

or even just

 >>> m[:],n[:] = n,m[:]

but not

 >>> m[:],n[:] = n[:],m

Is this a bug, something Python should smack the programmer for 
trying, or just me pushing the wrong edges? :)

Thanks,

-tkc







From benjamin.kaplan at case.edu  Mon Feb 23 13:49:02 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 23 Feb 2009 13:49:02 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A2ECDD.8040600@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
Message-ID: <ec96e1390902231049r7eaf39fco111ed7d6d5839879@mail.gmail.com>

On Mon, Feb 23, 2009 at 1:37 PM, Stef Mientki <stef.mientki at gmail.com>wrote:

> rdmurray at bitdance.com wrote:
>
>>
>> FYI, top posts are much harder to read and to reply to than if you edit
>> the message to which you are replying and add your new content interleaved
>> or at the bottom (as I have done).
>>
>>
> ??? I read that before, but I can't understand it.
> I think that depends totally on the mail reader you use (although I don't
> know any mail reader that scrolls to the bottom).
> I use Thunderbird, which opens every message at the top,
> so top posting is the best readable for me,
> I don't have to scroll (assuming that I know from previous readings the
> content of the previous message).
> Replying can be preset in any reader I know just as you like, bottom or
> top.
> So I guess there must be another reason, why some (or maybe even everyone
> except me)  don't prefer top posting.



It's because of your caveat. Many of us don't remember the exact content of
the threads, especially the complicated ones that result in several
branches. When you post underneath, we can see how the thread progressed as
we scroll down. It makes it easier to follow without digging through all the
other messages.
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From google at mrabarnett.plus.com  Mon Feb 23 13:49:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 18:49:55 +0000
Subject: unescape escapes in strings
In-Reply-To: <gnuq9n$7gp$1@news.motzarella.org>
References: <gnuoi3$jat$1@news.motzarella.org>	<mailman.535.1235413372.11746.python-list@python.org>
	<gnuq9n$7gp$1@news.motzarella.org>
Message-ID: <49A2EFD3.70809@mrabarnett.plus.com>

bvdp wrote:
> MRAB wrote:
>> bvdp wrote:
>>>
>>> When reading lines of data from a file in the from (no quotes!)
>>>
>>>     foo\x20bar
>>>
>>> and I assign to a variable in a line line like:
>>>
>>>  f = file('infile', 'r')
>>>  for a in f:
>>>     print a
>>>
>>> the string is read in as string with the literal characters 'f', 'o' 
>>> ... 'x' , '2' ...
>>>
>>> as compared to an assignment like:
>>>
>>>  a="foo\x20bar"
>>>
>>> which is identical to
>>>
>>> a="foo bar"
>>>
>>> Okay, so far ... I think this is what I want since my program is 
>>> using space characters as delimiters and I'm trying to use the \x20 
>>> notation to avoid splitting.
>>>
>>> But, now the problem. When I finally assign the string with the \x20 
>>> to a variable the literals are still there. And here I really want 
>>> them all nicely converted to the desired values.
>>>
>>> So, the question is: is there an "unescape()" for strings so that 
>>> "foo\x20bar" is converted to "foo bar"????
>>>
>>  >>> a = r"foo\x20bar"
>>  >>> print a
>> foo\x20bar
>>  >>> a = a.decode("string-escape")
>>  >>> print a
>> foo bar
>>
> 
> Thanks ... I think in my original testing I tried decode() but it didn't 
> work. Testing more ...
> 
>  the file has 2 lines:
>   foo bar
>   foo\x20bar
> 
> and the program to read is:
> f=file('in', 'r')
> for a in f:
>     a = a.strip()
>     a=a.decode()

You didn't specify what kind of decoding you want!

>     print list(a)
> 
> I get:
> 
> python read.py
> []
> [u'f', u'o', u'o', u' ', u'b', u'a', u'r']
> [u'f', u'o', u'o', u'\\', u'x', u'2', u'0', u'b', u'a', u'r']
> 
> So, the \x20 is still literal.
> 
> Any other ideas??? I suppose I could write a re expression ... but 
> surely that is not needed???
> 


From darcy at druid.net  Mon Feb 23 13:54:47 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 23 Feb 2009 13:54:47 -0500
Subject: Top posting
In-Reply-To: <49A2ECDD.8040600@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
Message-ID: <20090223135447.184e31bb.darcy@druid.net>

On Mon, 23 Feb 2009 19:37:17 +0100
Stef Mientki <stef.mientki at gmail.com> wrote:
> > FYI, top posts are much harder to read and to reply to than if you edit
> > the message to which you are replying and add your new content interleaved
> >   
> ??? I read that before, but I can't understand it.

It is very simple.  The critical part above is "...edit the
message..."  If you leave a 200 line message in your reply to discuss
three lines then it won't matter whether you top post or bottom post.
You still make it difficult for others to read your posting.

> I use Thunderbird, which opens every message at the top,
> so top posting is the best readable for me,

Only if the previous poster didn't trim their text.  Notice how I have
removed everything here that I am not replying to.  I doubt very much
if you have to scroll down to start reading my response.  You can also
tell at a glance that this is not a "me too" response.

> I don't have to scroll (assuming that I know from previous readings the 
> content of the previous message).

But how do you know what part of the message is being replied to?

> Replying can be preset in any reader I know just as you like, bottom or top.
> So I guess there must be another reason, why some (or maybe even 
> everyone except me)  don't prefer top posting.

Ah, that makes sense.
Because it is not the usual way we read the flow of a conversation.
What is so bad about top posting?

How long did you waste on the above exchange before reversing the lines
in your head?

The bottom line is that thousands of people are reading your reply but
only one (you) is writing it.  It just makes sense for you to take an
extra ten seconds to save thousands of people two seconds reading it.
It is polite and considerate to others.  If everyone did the same you
would also save because you read many more posts than you write.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From bob at mellowood.ca  Mon Feb 23 13:55:04 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:55:04 -0700
Subject: unescape escapes in strings
In-Reply-To: <mailman.541.1235414996.11746.python-list@python.org>
References: <gnuoi3$jat$1@news.motzarella.org>	<mailman.535.1235413372.11746.python-list@python.org>	<gnuq9n$7gp$1@news.motzarella.org>
	<mailman.541.1235414996.11746.python-list@python.org>
Message-ID: <gnure9$lml$1@news.motzarella.org>


Perfect ... thanks.

>>>  >>> a = a.decode("string-escape")

Using "string-escape" does the trick!

Wonderful, this python. And the quick answers on this group.



From bnsilinux at gmail.com  Mon Feb 23 13:55:52 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 10:55:52 -0800 (PST)
Subject: Which group ...
Message-ID: <17470b68-f175-4ab8-99de-e51560a8e86e@s14g2000vbp.googlegroups.com>

Ok, thanks ... I am going to be asking a lot of questions now ;->


From lists at cheimes.de  Mon Feb 23 14:08:44 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:08:44 +0100
Subject: A tale of two execs
In-Reply-To: <652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>	<4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>
	<652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>
Message-ID: <gnus7s$3ou$1@ger.gmane.org>

bieffe62 at gmail.com wrote
> I checked, and, for windows platform subprocess.py uses the modules
> mvscrt and _subprocess, which I ham unable to
> locate on my windows XP python 2.6 installation. This make the whole
> thing harder, even impossible if _subprocess has
> been created especially for subprocess.py.

Some modules are built into pythonXX.dll. You won't find them in the
file system.

The subprocess module either requires _subprocess or it can be switched
to pywin32. Check out the head of the file!

Christian



From lists at cheimes.de  Mon Feb 23 14:10:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:10:12 +0100
Subject: A tale of two execs
In-Reply-To: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <gnusak$3ou$2@ger.gmane.org>

aha wrote
> def runner(cmd, stdin, stdout, ...):
>   try:
>     import subprocess
>     sbm = 1
>   except:
>     sbm = 0
> 
>   # Now do something
>   if sbm:
>     process = subporcess(...)
>   else:
>     import popen2
>     process = popen2.Popen4(...)
> 
> Has anyone else run into a situation similar to this one?

The canonical way for your try/except clause is:

try:
    import subprocess
except ImportError:
    subprocess = None

...

if subprocess is not None:
    ...
else:
    ...

Christian



From Scott.Daniels at Acm.Org  Mon Feb 23 14:11:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 23 Feb 2009 11:11:33 -0800
Subject: Python Imaging Library (PIL): create PDF from scratch
In-Reply-To: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
Message-ID: <MPqdnRO40I7QaT_UnZ2dnUVZ_sjinZ2d@pdx.net>

zelegolas wrote:
> Hi,
> 
> I have some scan generated by SANE and i would like to do some
> transformation (like crop, brightness and resize) and finaly put all
> those images in PDF file.
> 
> With PIL i can do all the transformations that i want. But i don't
> know how i can create from scratch a PDF. I'm not even sure that PIL
> is the right library for that.
> 
> Any help/informations will be appreciate

Use PIL to fiddle the individual images, and reportlab to build
a pdf from the (now tweaked) images.

--Scott David Daniels
Scott.Daniels at Acm.Org


From yatsek at gmail.com  Mon Feb 23 14:11:57 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 11:11:57 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
Message-ID: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python, connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep


s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )


            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send something
                    #self.send_header('Content-type',	'text/plain')
                    self.send_header('Content-type',	'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data' action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek


From bnsilinux at gmail.com  Mon Feb 23 14:13:41 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 11:13:41 -0800 (PST)
Subject: Extending Python Questions .....
Message-ID: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>

Ok... Now I can start asking.

In My S-Lag Project called, SLAG, I have some function keys that get
mapped back to S-lang internal functions.

My SLAG project works pretty much like Python (as does the S-Lang).
You write a S-lang script
that "imports" your extension. module - and all this gets run by the
shell/interpreter.

I allow function keys to be mapped back internal function(s) inside of
the controlling program.

My question is which Python C api Do I need to this with ? Do I need
to worry about my reference counting since the Python Program is in
essence calling a function in itself?

Thanks

Ben ...


From yatsek at gmail.com  Mon Feb 23 14:13:46 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 11:13:46 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
Message-ID: <3abda581-de7b-49cc-8f13-bfb85c483ee4@q18g2000vbn.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python,
connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep

s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )

            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send
something
                    #self.send_header('Content-type',   'text/plain')
                    self.send_header('Content-type',    'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data'
action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above
server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek


From sternbrightblade at gmail.com  Mon Feb 23 14:15:39 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 11:15:39 -0800
Subject: different errors, return outside function and others
In-Reply-To: <op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
	<ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>
	<op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <ec06466f0902231115ra335d70hddba96ee67297354@mail.gmail.com>

Thank You, I now understand what i need to do now, and again Thanks

On Mon, Feb 23, 2009 at 1:57 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 23 Feb 2009 07:07:57 -0200, Tony <sternbrightblade at gmail.com>
> escribi?:
>
> ok thank you for that input, this is my first class in programming and its
>> the only one the school offers. im pretty sure those are supposed to be
>> modules
>> that im writting. would it make a difference if those were modules and not
>> functions? kinda stupid question there but im trying to learn as much as
>> possible.
>>
>
> Each module is a separate file, with extension .py
> If you put all your code in a single file, you write a single module.
> That's fine in this case, unless it grows to something unmanageable.
>
> Functions are blocks of code that have a name and "do" something specific,
> and usually return some result. They start with the keyword "def". You have
> defined several functions already, but called them "modules" in the
> comments, that's wrong and may be confusing.
>
> Also anything with def infront of it example def start(): would be a
>> function correct? also im Using 2.5 and the IDLE to do this
>>
>
> Exactly!
>
> I think you have written so much code without testing it. It's time to test
> every piece now. Start with... the start function, obviously!
>
> But before, you have to clean your code. There are a few strange lines that
> should not be there (all those lines on the left margin that aren't "def"
> statements, like intro_area(), alley()...). Just remove or comment them.
>
> Then you can start testing each function, one at a time. Simply call the
> function with the desired parameters (if any), right at the bottom of the
> file. To test the first one (start), use something like this:
>
> print "about to call start()"
> result = start()
> print "start() finished, result=", result
>
> and do the same for each individual function. Once you know each piece
> works fine, you can start combining them until you build the complete
> program.
>
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bblais at bryant.edu  Mon Feb 23 14:17:04 2009
From: bblais at bryant.edu (Brian Blais)
Date: Mon, 23 Feb 2009 14:17:04 -0500
Subject: Reference or Value?
In-Reply-To: <op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <6D420E20-FFC0-407B-ADCD-10D541E8C3CA@bryant.edu>

On Feb 23, 2009, at 3:03 , Gabriel Genellina wrote:

> En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak  
> <denis.kasak at gmail.com> escribi?:
>
>> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
>> <steven at remove.this.cybersource.com.au> wrote:
>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>
>>>> as far as i understand things, the best model is:
>>>>
>>>> 1 - everything is an object
>>>> 2 - everything is passed by reference
>>>
>>> Except that is wrong. If it were true, you could do this:
>>>
>>> def swap(x, y):
>>>    y, x = x, y
>>>
>>> a = 1
>>> b = 2
>>> swap(a, b)
>>> assert a == 2 and b == 1
>>>
>>>
>>> but you can't, it does not work. Ergo, parameter passing in  
>>> Python does
>>> not have the same semantics as languages that use pass-by- 
>>> reference, such
>>> as Pascal and Basic. That means that even if you can justify the  
>>> claim
>>> "Python is pass-by-reference" by some technical argument (and I  
>>> don't
>>> believe you can), it is misleading to make that claim without  
>>> further
>>> qualifications.
>>
>> You could, however, argue that the swap function doesn't work as
>> expected (e.g. from a Pascal or a C++ POV) simply because the
>> underlying objects aren't mutable.
>
> That's irrelevant - mutable and immutable objects are passed  
> exactly the same way.
>

I don't think they were saying that mutable and immutable objects  
were handled differently.  They are different in terms of what a  
function can do to them (mutate them or no). Thus, if you can't  
mutate them, then the caller can't see any changes in the objects by  
actions in the function so the swap won't work: it doesn't mutate the  
objects at all.  In the case of a list or a dict, then one can mutate  
them, and the changes are seen in the caller.  In both cases, the  
object itself is passed the same way.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From adleslie at gmail.com  Mon Feb 23 14:17:42 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 11:17:42 -0800 (PST)
Subject: python sql query in django
Message-ID: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>

I have three tables:

class Technology(models.Model):
    technology = models.CharField(max_length=100, null=True,
blank=True )
    def __unicode__(self):
        return self.technology
    class Meta:
        ordering = ["technology"]

class Publication(models.Model):
    pubtitle = models.TextField(null=True, blank=True)
def __unicode__(self):
        return self.pubtitle
    class Meta:
        ordering = ["pubtitle"]

class Techpubcombo(models.Model):
    technology = models.ForeignKey(Technology)
    publication = models.ForeignKey(Publication)

The user selects a technology from the drop down menu on the web
page.  The technology is retrieved
from the database table and then it must be used to retrieve the
publication attributes, by first going through the Techpubcombo table.

I wrote the select to retrieve the data for the html drop down box:
    technology_list = Technology.objects.all().order_by('technology')

After the user makes a selection, the technology_id is retrieved:
  technology_id = request.POST['technology_id']
    t = get_object_or_404(Technology, pk=technology_id)

Now I need to use the technology_id to get to the publication
attributes

This is where I'm stuck.

I get error messages when I try to do something like:

pub=t.techpubcombo.publications_set()

Ana


From woodygar at sky.com  Mon Feb 23 14:22:16 2009
From: woodygar at sky.com (Gary Wood)
Date: Mon, 23 Feb 2009 19:22:16 -0000
Subject: Can someone tell me why i get None at the end please this has me
	stuck for ages 
Message-ID: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>

'''exercise to complete and test this function'''
import string
def joinStrings(items):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
    word = [items]
    for item in items:
         print (item, end='')
   
    
def main():
    print(joinStrings(['very', 'hot','day']))
    print(joinStrings(['this', 'is','it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()

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From lionel.keene at gmail.com  Mon Feb 23 14:24:46 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 23 Feb 2009 11:24:46 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com> 
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com> 
	<mailman.408.1235205469.11746.python-list@python.org>
Message-ID: <da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>

On Feb 21, 12:37?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.ke... at gmail.com> ?
> escribi?:
>
> > Okay, moving the wx example into the same directory containing the
> > first example that was working fixed it. This directory only contains
> > these two modules and nothing else. The old directory which contained
> > the example that wasn't working did not contain a module with the same
> > name as the one I was trying to import, so i don't know why this "fix"
> > worked.
>
> Just play safe:
>
> - Don't use "from xxx import *", least from two places at the same time. ?
> The wx package has a short name on purpose - use "import wx" and then ?
> wx.Frame, etc.
>
> - Don't play with sys.path if you don't have to; you can put your own ?
> modules in a place already listed (like Lib\site-packages). Or, use a .pth ?
> file if you want to add a copmletely separate directory like ?
> c:\DataFileTypes
>
> --
> Gabriel Genellina

Okay, I've moved the module directory. Originally I had a Python
module named "DataFileTypes.py" in the "C:\DataFileTypes" folder. (the
complete path is therefore "C:\DataFileTypes\DataFileTypes.py"). To
access object types in this module from other Pyhton modules I
specified the following:


import sys
sys.path.append("C:\DataFileTypes")
from DataFileTypes import *


The above 3 lines of code are contained at the begining of a module
whose complete path is "C:\Python path test\Test.py".  This folder
only contains this module and two other unrelated python files I've
written. At the moment this works fine i.e. Python is able to find the
DataFileTypes.py module at its location using the "sys.path.append /
import" statements above. However, now I've moved the "DataFileTypes"
folder containing the module so that the new complete path is:

"C:\Python25\Lib\site-packages\DataFileTypes\DataFileTypes.py"

At this point I print the sys.path from the Python shell:

IDLE 1.2.4
>>> import sys
>>> print sys.path
['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
\site-packages', 'C:\\Python25\\lib\\site-packages\\wx-2.8-msw-
unicode']
>>>

"...\site-packages" is indeed listed on the path. I now remove:

import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *

from the invoking module and replace it with:

from DataFileTypes import *

When I attempt to run the Test.py program after these changes I get
error messages claiming:

"except DataFileError:
NameError: name 'DataFileError' is not defined"

I get an error again claiming that my custom exception "DataFileError"
declared in "DataFileTypes" is not defined. Why does this work fine
when I have my module in the root directory and append the sys.path,
but stops working when I put the module in another directory already
resident in the sys.path?





From rob.clewley at gmail.com  Mon Feb 23 14:26:18 2009
From: rob.clewley at gmail.com (Rob Clewley)
Date: Mon, 23 Feb 2009 14:26:18 -0500
Subject: Can someone tell me why i get None at the end please this has me 
	stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <a749952d0902231126r5f981724n91e22b7ee35a62e1@mail.gmail.com>

You get None b/c that's what's being returned from your join strings
function. Your function already prints out the result and doesn't
return the joined strings a your usage case expects.

So either return the joined strings from your function and don't print
them inside the function, or vice versa. Besides, can't you just use

print "".join(list_of_strings)

?

On Mon, Feb 23, 2009 at 2:22 PM, Gary Wood <woodygar at sky.com> wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>
>
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()
>


From marduk at letterboxes.org  Mon Feb 23 14:27:25 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Mon, 23 Feb 2009 14:27:25 -0500
Subject: Can someone tell me why i get None at the end please this has
	me stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <1235417245.27041.2.camel@localhost.localdomain>

On Mon, 2009-02-23 at 19:22 +0000, Gary Wood wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>    
>     
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>  
> main()

Your function, joinStrings() doesn't return a value. In Python a
function that doesn't return a value explicitly returns None by default.

So your print statements in main() will all print None.



From stef.mientki at gmail.com  Mon Feb 23 14:29:42 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 20:29:42 +0100
Subject: Top posting
In-Reply-To: <20090223135447.184e31bb.darcy@druid.net>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>
	<20090223135447.184e31bb.darcy@druid.net>
Message-ID: <49A2F926.5010207@gmail.com>

I agree that top posting on a message like this is not very convenient,
but for simple messages ...

D'Arcy J.M. Cain wrote:
> On Mon, 23 Feb 2009 19:37:17 +0100
> Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>>> FYI, top posts are much harder to read and to reply to than if you edit
>>> the message to which you are replying and add your new content interleaved
>>>   
>>>       
>> ??? I read that before, but I can't understand it.
>>     
>
> It is very simple.  The critical part above is "...edit the
> message..."  If you leave a 200 line message in your reply to discuss
> three lines then it won't matter whether you top post or bottom post.
> You still make it difficult for others to read your posting.
>
>   
I think not the way in which the result is reached, but the result 
itself is important,
and i like to get to the result as fast as possible.
That's why in simple messages, I find top posting is more convenient.
Version history is often (always?) written in reversed chronological order,
you're only interested in the few last ones.
>> I use Thunderbird, which opens every message at the top,
>> so top posting is the best readable for me,
>>     
>
> Only if the previous poster didn't trim their text.  Notice how I have
> removed everything here that I am not replying to.  I doubt very much
> if you have to scroll down to start reading my response.  You can also
> tell at a glance that this is not a "me too" response.
>   
Trimming is very useful and it's done too little.
If you read mail by gmail (which I also do),
you would love that everyone top posts (as you very fast open/close 
messages and see the top of the messages without scrolling)

>   
>> I don't have to scroll (assuming that I know from previous readings the 
>> content of the previous message).
>>     
>
> But how do you know what part of the message is being replied to?
>   
simple messages, 1 issue ?
>   
>> Replying can be preset in any reader I know just as you like, bottom or top.
>> So I guess there must be another reason, why some (or maybe even 
>> everyone except me)  don't prefer top posting.
>>     
>
> Ah, that makes sense.
> Because it is not the usual way we read the flow of a conversation.
> What is so bad about top posting?
>
> How long did you waste on the above exchange before reversing the lines
> in your head?
>   
I do it already more than 10 years, and I mean that !!
When I write a report, almost nobody is interested in all 
investigations, arguments,
most are only interested in the conclusion and is therefor always on top.
By not top-posting on simple messages,
we stick to the middle ages and prevent development of new ideas.
> The bottom line is that thousands of people are reading your reply but
> only one (you) is writing it.  It just makes sense for you to take an
> extra ten seconds to save thousands of people two seconds reading it.
> It is polite and considerate to others.  If everyone did the same you
> would also save because you read many more posts than you write.
>
>   
If it's considered polite, I will try to best next time I post to this 
group.
But I'm not convinced that it saves time for anyone.

btw, it's also polite (in some cultures) to sign your messages ;-)

( I don't want to start a flame war, so this is my last response to this 
thread)

cheers,
Stef Mientki






From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 14:31:15 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 20:31:15 +0100
Subject: python sql query in django
In-Reply-To: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
Message-ID: <49a3071a$0$18735$426a34cc@news.free.fr>

May a ?crit :
> I have three tables:

Actually - from Python's code POV - three Model classes. And actually, 
since there's a very active, friendly and helpful django group on 
googlegroups, you'd be better reposting your question there.

(snip Django's ORM related question)


From joshua at joshuakugler.com  Mon Feb 23 14:33:45 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Mon, 23 Feb 2009 10:33:45 -0900
Subject: urllib2 login help
References: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
Message-ID: <gnutmq$7qh$1@ger.gmane.org>

You also might want to look at http://wwwsearch.sourceforge.net/mechanize/ 
It will do most of the hard stuff for you (sending form elements, keeping
track of cookies, etc.).

j

john.weatherwax at gmail.com wrote:

> Hello,
> 
> I'm having trouble using urllib2 (maybe) when trying to log into a web
> site that requires a user to enter a login name and a password
> (authentication).  I've tried many things but none seem to work and
> have become stuck recently and was hoping to get a hint from those
> much more knowledgeable than myself.
> 
> I want to automate logging on to the investopedia stock simulator web
> site.
> 
> http://simulator.investopedia.com/authorization/login.aspx
> 
> I can't seem to automate this successfully.
> 
> My python script is below:
> 
> import os,re
> import urllib, urllib2
> 
> theurl = "http://simulator.investopedia.com/authorization/login.aspx"
> 
> post_dict = { "ct100$MainPlaceHolder$usernameText": "XXX",
> "ct100$MainPlaceHolder$passwordText": "XXX", "ct100$MainPlaceHolder
> $loginButton": "Sign In", "ct100$MainPlaceHolder$rememberMeCheckBox":
> "on" }
> 
> post_data = urllib.urlencode( post_dict )
> 
> headers = { 'User-agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
> NT)',
>             'Host': 'simulator.investopedia.com',
>             'Referer': 'http://simulator.investopedia.com/
> authorization/login.aspx',
>             }
> 
> req = urllib2.Request( theurl, post_data, headers )
> response = urllib2.urlopen(req)
> the_page = response.read()
> 
> The problem is that this page returned seems to be the same as the
> login page which I connected to initially.  When I perform the login
> process manually things work as expected.  What am I doing
> incorrectly?
> 
> *ANY* hints/suggestions/directions would be very appreciated since
> I've run out of ideas of things to try at this point.
> 
> Thanks very much
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list




From lists at cheimes.de  Mon Feb 23 14:41:42 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:41:42 +0100
Subject: Reference or Value?
In-Reply-To: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <gnuu5m$beu$1@ger.gmane.org>

Denis Kasak wrote
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable. The objects *do* get passed by
> reference; 

We are getting down the same road every couple of months. Please don't
explain Python's calling system with terms like "call by reference".
It's plain simple wrong. The correct term is "call by sharing" or "call
by object reference" although I myself don't use the latter term because
it sounds too much like "call by reference". Every time somebody tries
to explain Python with "call by reference", the person is confusing
himself and others.

Christian



From david.birdsong at gmail.com  Mon Feb 23 14:49:03 2009
From: david.birdsong at gmail.com (birdsong)
Date: Mon, 23 Feb 2009 11:49:03 -0800 (PST)
Subject: Python shell scripting and errors
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
	<1235409711.12946.31.camel@tim-laptop>
	<mailman.528.1235410499.11746.python-list@python.org>
Message-ID: <96c8cd5f-7b26-4c81-9b80-b80e9c70aaef@j8g2000yql.googlegroups.com>

On Feb 23, 9:34?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Feb 23, 2009, at 12:21 PM, Tim Wintle wrote:
>
> > On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
> >> I've got a python script running as a daemon (using someone else's
> >> daemon module). It runs fine for a while, but will occasionally balk
> >> and die. Since its running in the background, I'm getting no error
> >> from it.
>
> >> What's the best way to capture the output into a file for later ?
> >> review?
>
> > Point standard out to an open file handle?
>
> And stderr.
>
> I don't know how the OP's daemon is being launched, but the crontab ?
> command below worked for me for redirecting errors to a log file ?
> without the need to modify the script.
>
> python /usr/local/foo/bar.py >> /var/log/foo/bar.txt 2>&1

If the daemon module is worth it's salt, it will have probably closed
all open filehandles including STDOUT and STDERR.  So this might not
work.

If all you want is some temporary debugging, add some redirection for
stdout and stderr after you daemonize.

import sys
sys.stderr = open('/path/to/suitable_stderr_file', 'w')
sys.stdout = open('/path/to/suitable_stdout_file', 'w')


I'm pretty sure this should catch any tracebacks.

>
> HTH
> Philip



From denis.kasak at gmail.com  Mon Feb 23 14:58:42 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 20:58:42 +0100
Subject: Reference or Value?
In-Reply-To: <gnuu5m$beu$1@ger.gmane.org>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<gnuu5m$beu$1@ger.gmane.org>
Message-ID: <39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>

On Mon, Feb 23, 2009 at 8:41 PM, Christian Heimes <lists at cheimes.de> wrote:
> Denis Kasak wrote
>> You could, however, argue that the swap function doesn't work as
>> expected (e.g. from a Pascal or a C++ POV) simply because the
>> underlying objects aren't mutable. The objects *do* get passed by
>> reference;
>
> We are getting down the same road every couple of months. Please don't
> explain Python's calling system with terms like "call by reference".
> It's plain simple wrong. The correct term is "call by sharing" or "call
> by object reference" although I myself don't use the latter term because
> it sounds too much like "call by reference". Every time somebody tries
> to explain Python with "call by reference", the person is confusing
> himself and others.

I assure you I am not confused about Python's object model / calling
system. I was arguing, from a purely theoretical standpoint, that the
same system Python uses could be described in terms of
call-by-reference with some additional constraints. I am by no means
arguing that this is a good way of explaining it or trying to explain
it to someone in terms of call-by-reference. I just don't think it's
"plain simple wrong", just confusing and suboptimal.

-- 
Denis Kasak


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 15:02:22 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 21:02:22 +0100
Subject: Server programming
In-Reply-To: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
References: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
Message-ID: <49a30e64$0$20701$426a74cc@news.free.fr>

koranthala a ?crit :
> Hi,
>       Is server programming in Python procedure oriented or object
> oriented?

It's how you want it to be.

>       I have this question because lately I am asked to make a medium
> complex web program (extremely database oriented) using Django. When I
> used to do application programs earlier (in Python itself),  the whole
> thing being object oriented came out easily in programming. So, I was
> able to use different patterns etc for programming and the whole thing
> was - quite fun to design and create.
>       But when I program in Django, since I just have to work on user
> responses - everything else being taken care of by Django - only, the
> complete coding has become procedure oriented. It is not kludgy or
> anything, but it doesnt have the nice feeling that we get when we code
> a proper object oriented program.

So you may want to learn to enjoy the nice feeling we get when we code a 
proper procedural program - or a proper functional one FWIW !-)

There's nothing inherently wrong with procedural programming. Nor with a 
mix of procedural, OO and functional code - which is usually the case in 
Python. It's just a matter of using the right tool for the problem to 
solve.

>       Is my coding in error here?

Don't know - I don't have access to your code. But my experience with 
Django is that I tend to have quite a lot of code in models and 
templatetags, and much less in the views themselves. So I wouldn't say 
that "Django takes care of everything else". If you really ends up 
writing pages upon pages of repeting procedural code in your views and 
nothing in the other parts of the app, then yes, there might be 
something wrong - probably a case of AnemicDomainModel, and possibly a 
lack of knowledge of the whole framework. One of the reasons views are 
usually implemented as functions is that in most cases, you shouldn't 
have a need for more. FWIW, you sometimes don't even need to write a 
specific view - Django's GenericViews can handle quite a lot of cases

Note also that Django doesn't _require_ that you use functions as view 
handlers - any callable object will do. But given how the HTTP protocol 
works and how Django is designed, there's more often than not just no 
*need* for a custom callable object.

And finally, as Steve already mentioned, OO is first about objects, and 
that's what you're dealing with in your views - request objects, session 
objects, model objects etc...

> This is infact my first web program,
> so it might be the reason. What does other people find? Does web
> server programming using web frameworks (Django, TurboGears etc) make
> it procedure oriented?

Not necessarily, no. Some frameworks requires your request handlers to 
be methods of classes FWIW, and nothing in Django prevents you from 
doing so if you want.

> If I am in the wrong, it might be due to a
> wrong design or mindset, and I would like to change it.




From steve at holdenweb.com  Mon Feb 23 15:03:58 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:03:58 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
Message-ID: <gnuvfg$ejq$1@ger.gmane.org>

yatsek at gmail.com wrote:
> Hi there.
[...]

Yatsek:

You just "hijacked a thread" by writing your question as a reply to
somebody else's post. Be aware that a lot of newsreaders will show it as
a part of this other thread rather than giving if a thread of its own,
and so many people (who may have skimmed over the other thread) won't
see your post!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Mon Feb 23 15:10:07 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 23 Feb 2009 12:10:07 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com> 
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com> 
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
Message-ID: <02ed27ed-4b4f-41b2-b4b8-7914d3f13674@v39g2000yqm.googlegroups.com>

On Feb 23, 11:24?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 21, 12:37?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>
>
>
>
>
> > En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.ke... at gmail.com> ?
> > escribi?:
>
> > > Okay, moving the wx example into the same directory containing the
> > > first example that was working fixed it. This directory only contains
> > > these two modules and nothing else. The old directory which contained
> > > the example that wasn't working did not contain a module with the same
> > > name as the one I was trying to import, so i don't know why this "fix"
> > > worked.
>
> > Just play safe:
>
> > - Don't use "from xxx import *", least from two places at the same time. ?
> > The wx package has a short name on purpose - use "import wx" and then ?
> > wx.Frame, etc.
>
> > - Don't play with sys.path if you don't have to; you can put your own ?
> > modules in a place already listed (like Lib\site-packages). Or, use a .pth ?
> > file if you want to add a copmletely separate directory like ?
> > c:\DataFileTypes
>
> > --
> > Gabriel Genellina
>
> Okay, I've moved the module directory. Originally I had a Python
> module named "DataFileTypes.py" in the "C:\DataFileTypes" folder. (the
> complete path is therefore "C:\DataFileTypes\DataFileTypes.py"). To
> access object types in this module from other Pyhton modules I
> specified the following:
>
> import sys
> sys.path.append("C:\DataFileTypes")
> from DataFileTypes import *
>
> The above 3 lines of code are contained at the begining of a module
> whose complete path is "C:\Python path test\Test.py". ?This folder
> only contains this module and two other unrelated python files I've
> written. At the moment this works fine i.e. Python is able to find the
> DataFileTypes.py module at its location using the "sys.path.append /
> import" statements above. However, now I've moved the "DataFileTypes"
> folder containing the module so that the new complete path is:
>
> "C:\Python25\Lib\site-packages\DataFileTypes\DataFileTypes.py"
>
> At this point I print the sys.path from the Python shell:
>
> IDLE 1.2.4>>> import sys
> >>> print sys.path
>
> ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> \site-packages', 'C:\\Python25\\lib\\site-packages\\wx-2.8-msw-
> unicode']
>
>
>
> "...\site-packages" is indeed listed on the path. I now remove:
>
> import sys
> sys.path.append("c:\DataFileTypes")
> from DataFileTypes import *
>
> from the invoking module and replace it with:
>
> from DataFileTypes import *
>
> When I attempt to run the Test.py program after these changes I get
> error messages claiming:
>
> "except DataFileError:
> NameError: name 'DataFileError' is not defined"
>
> I get an error again claiming that my custom exception "DataFileError"
> declared in "DataFileTypes" is not defined. Why does this work fine
> when I have my module in the root directory and append the sys.path,
> but stops working when I put the module in another directory already
> resident in the sys.path?- Hide quoted text -
>
> - Show quoted text -

Taking "DataFileTypes.py" module out of the "...\site-packages
\DataFileTypes" folder and placing it directly into the "site-
packages" folder seems to have cleared it up. Some problem between
package and module usage I suppose.


From steve at holdenweb.com  Mon Feb 23 15:12:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:12:05 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>	<gnuu5m$beu$1@ger.gmane.org>
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
Message-ID: <gnuvun$hlf$1@ger.gmane.org>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 8:41 PM, Christian Heimes <lists at cheimes.de> wrote:
>> Denis Kasak wrote
>>> You could, however, argue that the swap function doesn't work as
>>> expected (e.g. from a Pascal or a C++ POV) simply because the
>>> underlying objects aren't mutable. The objects *do* get passed by
>>> reference;
>> We are getting down the same road every couple of months. Please don't
>> explain Python's calling system with terms like "call by reference".
>> It's plain simple wrong. The correct term is "call by sharing" or "call
>> by object reference" although I myself don't use the latter term because
>> it sounds too much like "call by reference". Every time somebody tries
>> to explain Python with "call by reference", the person is confusing
>> himself and others.
> 
> I assure you I am not confused about Python's object model / calling
> system. I was arguing, from a purely theoretical standpoint, that the
> same system Python uses could be described in terms of
> call-by-reference with some additional constraints. I am by no means
> arguing that this is a good way of explaining it or trying to explain
> it to someone in terms of call-by-reference. I just don't think it's
> "plain simple wrong", just confusing and suboptimal.
> 
Well, what's the benefit of discussing such a description, then?
Regulars on c.l.py see this subject arising so regularly it's a bit like
"there's nothing new under the sun". Honestly, it's been discussed /ad
nauseam/ lately.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Mon Feb 23 15:18:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 21:18:16 +0100
Subject: Extending Python Questions .....
In-Reply-To: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
Message-ID: <70gek8F5ep0jU1@mid.uni-berlin.de>

Ben schrieb:
> Ok... Now I can start asking.
> 
> In My S-Lag Project called, SLAG, I have some function keys that get
> mapped back to S-lang internal functions.
> 
> My SLAG project works pretty much like Python (as does the S-Lang).
> You write a S-lang script
> that "imports" your extension. module - and all this gets run by the
> shell/interpreter.
> 
> I allow function keys to be mapped back internal function(s) inside of
> the controlling program.
> 
> My question is which Python C api Do I need to this with ? Do I need
> to worry about my reference counting since the Python Program is in
> essence calling a function in itself?


What's S-Lag? What is S-Lang?

I'm sure I can google that, however I think you might want to provide a 
bit more context yourself to receive better answers.

Diez


From wolfgang at rohdewald.de  Mon Feb 23 15:26:54 2009
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Mon, 23 Feb 2009 21:26:54 +0100
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <gnuvfg$ejq$1@ger.gmane.org>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
	<gnuvfg$ejq$1@ger.gmane.org>
Message-ID: <200902232126.54519.wolfgang@rohdewald.de>

On Montag, 23. Februar 2009, Steve Holden wrote:
> yatsek at gmail.com wrote:
> > Hi there.
> [...]
> 
> Yatsek:
> 
> You just "hijacked a thread" by writing your question as a reply to
> somebody else's post

did he? His mail headers show no reference to any other mail AFAICS

-- 
Wolfgang


From nick at craig-wood.com  Mon Feb 23 15:31:54 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 23 Feb 2009 14:31:54 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
Message-ID: <slrngq611k.c4u.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  In My S-Lag Project called, SLAG, I have some function keys that get
>  mapped back to S-lang internal functions.
> 
>  My SLAG project works pretty much like Python (as does the S-Lang).
>  You write a S-lang script
>  that "imports" your extension. module - and all this gets run by the
>  shell/interpreter.
> 
>  I allow function keys to be mapped back internal function(s) inside of
>  the controlling program.
> 
>  My question is which Python C api Do I need to this with ? 

Do you mean like this?

  http://code.google.com/p/python-slang 

Not sure how well maintained it is though.

> Do I need to worry about my reference counting since the Python
> Program is in essence calling a function in itself?

I'm not sure I understand you here, but in general you don't need to
worry about reference counting in Python - it all happens behind the
scenes.  If you are writing a python extension in C then you do need
to worry about reference counting - a lot!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From tdelaney at avaya.com  Mon Feb 23 15:34:57 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Tue, 24 Feb 2009 04:34:57 +0800
Subject: Peculiar swap behavior
In-Reply-To: <49A2EE60.1060300@tim.thechases.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>

Tim Chase wrote:

> # swap list contents...not so much...
>  >>> m,n = [1,2,3],[4,5,6]
>  >>> m[:],n[:] = n,m
>  >>> m,n
> ([4, 5, 6], [4, 5, 6])
> 
> 
> The first two work as expected but the 3rd seems to leak some
> internal abstraction.  It seems to work if I force content-copying:
> 
>  >>> m[:],n[:] = n[:],m[:]
> 
> or even just
> 
>  >>> m[:],n[:] = n,m[:]
> 
> but not
> 
>  >>> m[:],n[:] = n[:],m
> 
> Is this a bug, something Python should smack the programmer for
> trying, or just me pushing the wrong edges? :)

For these types of things, it's best to expand the code out. The
appropriate expansion of:

    m,n = [1,2,3],[4,5,6]
    m[:],n[:] = n,m

is:

    m = [1,2,3]
    n = [4,5,6]
    m[:] = n
    n[:] = m

After the third line, m == n, giving the behaviour you see. OTOH, for:

    m,n = [1,2,3],[4,5,6]
    m[:],n[:] = n[:],m[:]

the expansion is more like:

    m = [1,2,3]
    n = [4,5,6]
    rhs1 = n[:]
    rhs2 = m[:]
    m[:] = rhs1
    n[:] = rhs2

Tim Delaney


From s.selvamsiva at gmail.com  Mon Feb 23 15:38:56 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Tue, 24 Feb 2009 02:08:56 +0530
Subject: Need to store dictionary in file
Message-ID: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>

Hi all,

I have a dictionary in which each key is associated with a list as value.

eg: *dic={'a':['aa','ant','all']}*

The dictionary contains *1.5 lakh keys*.
Now i want to store it to a file,and need to be loaded to python program
during execution.
I expect your ideas/suggestions.

Note:I think cPickle,bsddb can be used for this purpose,but i want to know
the best solution which runs *faster*.

-- 
Yours,
S.Selvam
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From denis.kasak at gmail.com  Mon Feb 23 15:39:53 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 21:39:53 +0100
Subject: Reference or Value?
In-Reply-To: <gnuvun$hlf$1@ger.gmane.org>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<gnuu5m$beu$1@ger.gmane.org>
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
	<gnuvun$hlf$1@ger.gmane.org>
Message-ID: <39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:12 PM, Steve Holden <steve at holdenweb.com> wrote:
> Denis Kasak wrote:
>> I assure you I am not confused about Python's object model / calling
>> system. I was arguing, from a purely theoretical standpoint, that the
>> same system Python uses could be described in terms of
>> call-by-reference with some additional constraints. I am by no means
>> arguing that this is a good way of explaining it or trying to explain
>> it to someone in terms of call-by-reference. I just don't think it's
>> "plain simple wrong", just confusing and suboptimal.
>>
> Well, what's the benefit of discussing such a description, then?
> Regulars on c.l.py see this subject arising so regularly it's a bit like
> "there's nothing new under the sun". Honestly, it's been discussed /ad
> nauseam/ lately.

Someone said upthread that Andrew Cooke was completely wrong and I
contested that. :-)
I apologise for not being current with the latest discussions.

-- 
Denis Kasak


From philip at semanchuk.com  Mon Feb 23 15:41:08 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 15:41:08 -0500
Subject: Python C-API Object Allocation
In-Reply-To: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
References: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
Message-ID: <DB5CBF90-F160-480B-BF6E-03ACD6E64958@semanchuk.com>


On Feb 21, 2009, at 10:01 AM, William Newbery wrote:

> Ive been learning the C-API lately so I can write python extensions  
> for some of my c++ stuff.
>
> I want to use the new and delete operators for creating and  
> destroying my objects.
>
> The problem is python seems to break it into several stages. tp_new,  
> tp_init and tp_alloc for creation and tp_del, tp_free and tp_dealloc  
> for destruction. However c++ just has new which allocates and fully  
> constructs the object and delete which destructs and deallocates the  
> object.
>
> Which of the python tp_* methods do I need to provide and what must  
> they do to be compatible with python subclassing.
>
> Also I want to be able to create the object directly in c++ eg  
> "PyObject *obj = new MyExtensionObject(args);"

Hi William,
You can't use C++ new and delete to create Python objects. Not if you  
intend to use them in Python, anyway. Python has its own memory  
management, reference counting, etc. and C++ knows nothing about that.  
You could probably cook up an ugly hack that might work, but you'd be  
swimming against the tide.

If you want to create Python objects, you need ask Python to do it.  
The function PyObject_New() is probably what you want:
http://docs.python.org/c-api/allocation.html


FYI, there are lists specifically for the Python C API and C++ issues.  
I don't mean to chase you away from here; plenty of people ask C API  
questions here. But the other groups are helpful to know about and,  
having just learned about them myself I'm trying to spread the word.  
The lists are here:
http://mail.python.org/mailman/listinfo


Cheers
Philip


From adleslie at gmail.com  Mon Feb 23 15:44:51 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 12:44:51 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
Message-ID: <c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>

On Feb 23, 11:31?am, Bruno Desthuilliers
<bdesth.quelquech... at free.quelquepart.fr> wrote:
> May a ?crit :
>
> > I have three tables:
>
> Actually - from Python's code POV - three Model classes. And actually,
> since there's a very active, friendly and helpful django group on
> googlegroups, you'd be better reposting your question there.
>
> (snip Django's ORM related question)

The django users groups suggests using a manytomany field.  That works
well in the html template, but in the admin tables, the logic for the
manytomany field applies to the wrong model and doesn't create a
choice for the data entry people.  I'm trying to write this without
using the manytomany option.  Just using the standard relational
database model.  I need to understand if python can do what I need to
do.  So far, I've not been successful with an answer in users groups.

Ana


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 15:48:32 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 21:48:32 +0100
Subject: python sql query in django
In-Reply-To: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
Message-ID: <49a31936$0$24803$426a74cc@news.free.fr>

May a ?crit :
(snip)
> I may not stay with Django.

Nope, but your question was about Django.

> I am seriously looking for whether python
> can read data from a relational database

Of course - as long as there's a Python adapter for your DB.

> and send to an html template

Of course - as long as it's either a Python templating system or there's 
a Python binding for this system.

> or do I always need some kind of wrapper/interface such as Rails

Uh ? Rails is a Ruby framework.

> or
> Django?  

No, you don't. If you prefer to reinvent the wheel on each and any part 
of each an any web app you write, please feel free to do so.

> If this is the wrong group to ask that question

Which "that" question ?-)

For question related to Django's ORM, the django group is indeed a 
better place (as usual: always use the most specific group / maling list 
/ whatever first). If you have questions (like the above) that are about 
Python itself, you're at the right place.


From tav at espians.com  Mon Feb 23 15:50:57 2009
From: tav at espians.com (tav)
Date: Mon, 23 Feb 2009 20:50:57 +0000
Subject: Challenge: Please break this! [Python Security]
Message-ID: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>

Hey all,

As an attempt to convince Python-Dev of the merits of a
functions-based approach to security in Python, I've come up with a
simple challenge.

If enough smart hackers look at this and it holds up, Guido promises
to accept a patch which would enable this on both App Engine and
future Python versions.

So, please try the challenge and let me know how you find it. Thanks!

The challenge is simple:

* Open a fresh Python interpreter and do:

    >>> from safelite import FileReader

* You can use FileReader to read files on your filesystem
* Now find a way to *write* to the filesystem from your interpreter

[safelite.py is attached to this mail]

Please note that the aim of this isn't to protect Python against
crashes/segfaults or exhaustion of resources attacks, so those don't
count.

I'm keen to know your experiences even if you don't manage to write to
the filesystem -- and especially if you do!

Dinner and drinks on me for an evening -- when you are next in London
or I am in your town -- to the first person who manages to break
safelite.py and write to the filesystem.

Good luck and thanks! =)

-- 
love, tav

plex:espians/tav | tav at espians.com | +44 (0) 7809 569 369
http://tav.espians.com | http://twitter.com/tav | skype:tavespian
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From steve at holdenweb.com  Mon Feb 23 15:53:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:53:21 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	
	<mailman.464.1235320654.11746.python-list@python.org>	
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>	
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>	
	<gnuu5m$beu$1@ger.gmane.org>	
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>	
	<gnuvun$hlf$1@ger.gmane.org>
	<39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>
Message-ID: <49A30CC1.4040207@holdenweb.com>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 9:12 PM, Steve Holden <steve at holdenweb.com> wrote:
>> Denis Kasak wrote:
>>> I assure you I am not confused about Python's object model / calling
>>> system. I was arguing, from a purely theoretical standpoint, that the
>>> same system Python uses could be described in terms of
>>> call-by-reference with some additional constraints. I am by no means
>>> arguing that this is a good way of explaining it or trying to explain
>>> it to someone in terms of call-by-reference. I just don't think it's
>>> "plain simple wrong", just confusing and suboptimal.
>>>
>> Well, what's the benefit of discussing such a description, then?
>> Regulars on c.l.py see this subject arising so regularly it's a bit like
>> "there's nothing new under the sun". Honestly, it's been discussed /ad
>> nauseam/ lately.
> 
> Someone said upthread that Andrew Cooke was completely wrong and I
> contested that. :-)
> I apologise for not being current with the latest discussions.
> 
That's OK. If you haven't seen this stuff before it's new to you, I guess.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From darcy at druid.net  Mon Feb 23 15:55:57 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 23 Feb 2009 15:55:57 -0500
Subject: Top posting
In-Reply-To: <49A2F926.5010207@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
	<20090223135447.184e31bb.darcy@druid.net>
	<49A2F926.5010207@gmail.com>
Message-ID: <20090223155557.c810d017.darcy@druid.net>

On Mon, 23 Feb 2009 20:29:42 +0100
Stef Mientki <stef.mientki at gmail.com> wrote:
> I agree that top posting on a message like this is not very convenient,

Not convenient for thousands, slightly convenient for you.

> but for simple messages ...

It is still better to follow the suggestions I posted.  Also see
http://en.wikipedia.org/wiki/Posting_style.

> >> I don't have to scroll (assuming that I know from previous readings the 
> >> content of the previous message).
> >
> > But how do you know what part of the message is being replied to?
> >   
> simple messages, 1 issue ?

So, "simple" messages one rule and others a different rule?  Who
decides what is simple and what isn't.  If two people put the line in
different places that would really mess up the flow of an exchange
between them.

> When I write a report, almost nobody is interested in all 
> investigations, arguments,
> most are only interested in the conclusion and is therefor always on top.

You are talking about an abstract in a paper.  That is not the same as
a dialogue.  It's not even close.

> btw, it's also polite (in some cultures) to sign your messages ;-)

Hmm.  I appreciate that you took the time to remove my signature from
your reply but I don't think that you should then claim that I never
included one.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From steve at holdenweb.com  Mon Feb 23 15:57:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:57:44 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <200902232126.54519.wolfgang@rohdewald.de>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>	<gnuvfg$ejq$1@ger.gmane.org>
	<200902232126.54519.wolfgang@rohdewald.de>
Message-ID: <gnv2ka$r5v$1@ger.gmane.org>

Wolfgang Rohdewald wrote:
> On Montag, 23. Februar 2009, Steve Holden wrote:
>> yatsek at gmail.com wrote:
>>> Hi there.
>> [...]
>>
>> Yatsek:
>>
>> You just "hijacked a thread" by writing your question as a reply to
>> somebody else's post
> 
> did he? His mail headers show no reference to any other mail AFAICS
> 
No, apparently my newsreader just decided to mingle several threads for
no apparent reason. Bizarrely the thread now appears on its own even
though I haven't restarted Thunderbird.

Yatsek, please accept my apologies.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 16:00:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 16:00:20 -0500
Subject: python sql query in django
In-Reply-To: <c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
Message-ID: <gnv2p7$r5v$2@ger.gmane.org>

May wrote:
> On Feb 23, 11:31 am, Bruno Desthuilliers
> <bdesth.quelquech... at free.quelquepart.fr> wrote:
>> May a ?crit :
>>
>>> I have three tables:
>> Actually - from Python's code POV - three Model classes. And actually,
>> since there's a very active, friendly and helpful django group on
>> googlegroups, you'd be better reposting your question there.
>>
>> (snip Django's ORM related question)
> 
> The django users groups suggests using a manytomany field.  That works
> well in the html template, but in the admin tables, the logic for the
> manytomany field applies to the wrong model and doesn't create a
> choice for the data entry people.  I'm trying to write this without
> using the manytomany option.  Just using the standard relational
> database model.  I need to understand if python can do what I need to
> do.  So far, I've not been successful with an answer in users groups.
> 
I am sure if you explain in detail exactly what you want the admin to
present to your data entry people there are those on django-users who
can help you make it happen. That list *would* be the best place to get
an answer: this one mostly discusses the Python language in a more
generic manner.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From torriem at gmail.com  Mon Feb 23 16:14:43 2009
From: torriem at gmail.com (Michael Torrie)
Date: Mon, 23 Feb 2009 14:14:43 -0700
Subject: Python AppStore / Marketplace
In-Reply-To: <gnrn0o$4ju$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org>
Message-ID: <49A311C3.80707@gmail.com>

Steve Holden wrote:
> Unfortunately I have no idea what a "souq" is, so I suspect this may be
> linguistically biased against English speakers. Or perhaps I'm just
> ignorant.

Nah.  Not biased against English speakers.  Just biased against the
un-traveled.  :)


From yatsek at gmail.com  Mon Feb 23 16:17:31 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 13:17:31 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
Message-ID: <00e56c9a-85a7-440c-a48d-2a0ea9e00992@j35g2000yqh.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python,
connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep

s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )

            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send
something
                    #self.send_header('Content-type',   'text/plain')
                    self.send_header('Content-type',    'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data'
action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above
server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek

---
sorry for repost - I've made mistake and tried correct it just after
posting by deleting it. If it confuses somebody then again - sorry for
that


From stef.mientki at gmail.com  Mon Feb 23 16:20:39 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 22:20:39 +0100
Subject: Top posting
In-Reply-To: <20090223155557.c810d017.darcy@druid.net>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>	<20090223135447.184e31bb.darcy@druid.net>	<49A2F926.5010207@gmail.com>
	<20090223155557.c810d017.darcy@druid.net>
Message-ID: <49A31327.60807@gmail.com>


>> btw, it's also polite (in some cultures) to sign your messages ;-)
>>     
>
> Hmm.  I appreciate that you took the time to remove my signature from
> your reply but I don't think that you should then claim that I never
> included one.
>
>   
Sorry for that.

(now you get an idea how difficult it is for me to use the right posting 
guide lines)

cheers,
Stef




From p at ulmcnett.com  Mon Feb 23 16:20:57 2009
From: p at ulmcnett.com (Paul McNett)
Date: Mon, 23 Feb 2009 13:20:57 -0800
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <49A31339.6080207@ulmcnett.com>

tav wrote:
> I'm keen to know your experiences even if you don't manage to write to
> the filesystem -- and especially if you do!

Does it count when it breaks some standard libs that aren't even trying to write to 
the filesystem?

mac:ss pmcnett$ python sbs_studio.py pkm
Traceback (most recent call last):
   File "sbs_studio.py", line 159, in <module>
     main()
   File "sbs_studio.py", line 15, in main
     parser = OptionParser()
   File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
1191, in __init__
     self.set_usage(usage)
   File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
1266, in set_usage
     self.usage = _("%prog [options]")
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 566, in gettext
     return dgettext(_current_domain, message)
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 530, in dgettext
     codeset=_localecodesets.get(domain))
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 465, in translation
     mofiles = find(domain, localedir, languages, all=1)
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 437, in find
     for nelang in _expand_lang(lang):
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 131, in _expand_lang
     from locale import normalize
ImportError: cannot import name normalize

Paul


From yatsek at gmail.com  Mon Feb 23 16:23:32 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 13:23:32 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
	<gnuvfg$ejq$1@ger.gmane.org> <200902232126.54519.wolfgang@rohdewald.de>
	<mailman.569.1235422680.11746.python-list@python.org>
Message-ID: <9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>

On Feb 23, 9:57?pm, Steve Holden <st... at holdenweb.com> wrote:
> Wolfgang Rohdewald wrote:
> > On Montag, 23. Februar 2009, Steve Holden wrote:
> >> yat... at gmail.com wrote:
> >>> Hi there.
> >> [...]
>
> >> Yatsek:
>
> >> You just "hijacked a thread" by writing your question as a reply to
> >> somebody else's post
>
> > did he? His mail headers show no reference to any other mail AFAICS
>
> No, apparently my newsreader just decided to mingle several threads for
> no apparent reason. Bizarrely the thread now appears on its own even
> though I haven't restarted Thunderbird.
>
> Yatsek, please accept my apologies.
>
> regards
> ?Steve

Thx, my bad.
I was trying to correct spelling mistake by deleting older post just
after it was posted and re-posting. Sorry about that.

By the way - don't you think that Google could ad this feature (re-
editing post for some time after posting) and re-invent newsgroups
making it a lot of better tool for communication?

BR
Yatsek



From adleslie at gmail.com  Mon Feb 23 16:27:26 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 13:27:26 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
Message-ID: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>

On Feb 23, 1:00?pm, Steve Holden <st... at holdenweb.com> wrote:
> May wrote:
> > On Feb 23, 11:31 am, Bruno Desthuilliers
> > <bdesth.quelquech... at free.quelquepart.fr> wrote:
> >> May a ?crit :
>
> >>> I have three tables:
> >> Actually - from Python's code POV - three Model classes. And actually,
> >> since there's a very active, friendly and helpful django group on
> >> googlegroups, you'd be better reposting your question there.
>
> >> (snip Django's ORM related question)
>
> > The django users groups suggests using a manytomany field. ?That works
> > well in the html template, but in the admin tables, the logic for the
> > manytomany field applies to the wrong model and doesn't create a
> > choice for the data entry people. ?I'm trying to write this without
> > using the manytomany option. ?Just using the standard relational
> > database model. ?I need to understand if python can do what I need to
> > do. ?So far, I've not been successful with an answer in users groups.
>
> I am sure if you explain in detail exactly what you want the admin to
> present to your data entry people there are those on django-users who
> can help you make it happen. That list *would* be the best place to get
> an answer: this one mostly discusses the Python language in a more
> generic manner.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

I may not stay with Django.  I am seriously looking for whether python
can read data from a relational database and send to an html template
or do I always need some kind of wrapper/interface such as Rails or
Django?  If this is the wrong group to ask that question could you
recommend another python group that could?

Thanks.


From labmice at gmail.com  Mon Feb 23 16:33:29 2009
From: labmice at gmail.com (Learning Python)
Date: Mon, 23 Feb 2009 13:33:29 -0800 (PST)
Subject: intermediate python csv reader/writer question from a beginner
Message-ID: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>

anything related to csv, I usually use VB within excel to manipulate
the data, nonetheless, i finally got the courage to take a dive into
python.  i have viewed a lot of googled csv tutorials, but none of
them address everything i need.  Nonetheless, I was wondering if
someone can help me manipulate the sample csv (sample.csv) I have
generated:

,,
someinfo,,,,,,,
somotherinfo,,,,,,,
SEQ,Names,Test1,Test2,Date,Time,,
1,Adam,1,2,Monday,1:00 PM,,
2,Bob,3,4,Monday,1:00 PM,,
3,Charlie,5,6,Monday,1:00 PM,,
4,Adam,7,8,Monday,2:00 PM,,
5,Bob,9,10,Monday,2:00 PM,,
6,Charlie,11,12,Monday,2:00 PM,,
7,Adam,13,14,Tuesday,1:00 PM,,
8,Bob,15,16,Tuesday,1:00 PM,,
9,Charlie,17,18,Tuesday,1:00 PM,,

into (newfile.csv):

Adam-Test1,Adam-Test2,Bob-Test1,Bob-Test2,Charlie-Test1,Charlie-
Test2,Date,Time
1,2,3,4,5,6,Monday,1:00 PM
7,8,9,10,11,12,Monday,2:00 PM
13,14,15,16,17,18,Tuesday,1:00 PM

note:
1. the true header doesn't start line 4 (if this is the case would i
have to use "split"?)
2. if there were SEQ#10-12, or 13-15, it would still be Adam, Bob,
Charlie, but with different Test1/Test2/Date/Time


From deets at nospam.web.de  Mon Feb 23 16:34:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 22:34:12 +0100
Subject: python sql query in django
In-Reply-To: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
Message-ID: <70gj2oF5i4l2U1@mid.uni-berlin.de>

> I may not stay with Django.  I am seriously looking for whether python
> can read data from a relational database and send to an html template
> or do I always need some kind of wrapper/interface such as Rails or
> Django?  If this is the wrong group to ask that question could you
> recommend another python group that could?

Python itself comes neither with an ORM, nor with a HTML 
generating/mapping framework.

So yes, if you want something like that, need something like rails or 
django. Or TurboGears.

For example, you can use SQLAlchemy as ORM, and RUM as frontend for it. 
I'm not sure if it fullfills your requirements though.

http://python-rum.org/

Diez


From tav at espians.com  Mon Feb 23 16:35:46 2009
From: tav at espians.com (tav)
Date: Mon, 23 Feb 2009 21:35:46 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <eb24b25b0902231335w1d0e6d60r5f6f37efc5117e56@mail.gmail.com>

Please use this attached updated safelite.py

Victor Stinner got the dinner by using the reload builtin =)

Good luck!

-- 
love, tav

plex:espians/tav | tav at espians.com | +44 (0) 7809 569 369
http://tav.espians.com | http://twitter.com/tav | skype:tavespian
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From tim.wintle at teamrubber.com  Mon Feb 23 16:35:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 21:35:49 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <1235424949.27699.44.camel@tim-laptop>

On Mon, 2009-02-23 at 20:50 +0000, tav wrote:
> I'm keen to know your experiences even if you don't manage to write to
> the filesystem -- and especially if you do!
> 

er sorry, but:

from safelite import FileReader
reload(__builtins__)
f = open("/home/tim/nano.save","w")
f.write("oops")
f.close()

> Dinner and drinks on me for an evening -- when you are next in London
> or I am in your town -- to the first person who manages to break
> safelite.py and write to the filesystem.

I'm in London on Wednesday ;-) Unfortunately I'm going to be too busy to
take up your offer, lol


Tim Wintle






From philip at semanchuk.com  Mon Feb 23 16:45:26 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 16:45:26 -0500
Subject: python sql query in django
In-Reply-To: <70gj2oF5i4l2U1@mid.uni-berlin.de>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<70gj2oF5i4l2U1@mid.uni-berlin.de>
Message-ID: <B12A85AE-6543-4D55-BE1D-C1B834C23076@semanchuk.com>


On Feb 23, 2009, at 4:34 PM, Diez B. Roggisch wrote:

>> I may not stay with Django.  I am seriously looking for whether  
>> python
>> can read data from a relational database and send to an html template
>> or do I always need some kind of wrapper/interface such as Rails or
>> Django?  If this is the wrong group to ask that question could you
>> recommend another python group that could?
>
> Python itself comes neither with an ORM, nor with a HTML generating/ 
> mapping framework.
>
> So yes, if you want something like that, need something like rails  
> or django. Or TurboGears.
>
> For example, you can use SQLAlchemy as ORM, and RUM as frontend for  
> it. I'm not sure if it fullfills your requirements though.

And if you don't like ORMs, most databases have at least one adapter  
out there that allows one to send straight SQL to the DB engine and  
get results back in some useful form. For instance, there's the  
psycopg2 adapter for talking to Postgres. Python has a built-in  
wrapper for SQLite.




From sedelblut at gmail.com  Mon Feb 23 16:45:31 2009
From: sedelblut at gmail.com (Stephen)
Date: Mon, 23 Feb 2009 13:45:31 -0800 (PST)
Subject: Reading a tab delimited text file.
Message-ID: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>

Hi,

I would like to read a text file of numbers produced by a data
acquisition system into three vectors of doubles. The contents of the
file are:

+0.0000000e+0	+2.7645134e+1	+2.7745625e+1

+0.4100041e-1	+2.7637787e+1	+2.7731047e+1

+0.0820008e+0	+2.7645134e+1	+2.7750483e+1
...

or

+0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
...

I would like to read the first column into time_vec, second into
ch1_vec and so on.

(I have never programmed in python and am having trouble finding a way
to do this).

Thanks


From skippy.hammond at gmail.com  Mon Feb 23 16:49:22 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Tue, 24 Feb 2009 08:49:22 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <01b28edb$0$20619$c3e8da3@news.astraweb.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <49A319E2.1000306@gmail.com>

On 23/02/2009 11:41 PM, Chris Cormie wrote:
>
>> If that not-very-technical description [all I've ever needed] doesn't
>> help, you'll need to read the DW help file (HTFF1K) or wait till
>> someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p

LOL sounds right!

> How do you get *Python* to tell you the dll and the problem symbol? Not
> external tools, Python. Python at a low level is calling LoadLibrary and
> GetProcAddress to resolve symbols and the call fails.

It is the LoadLibrary that is failing; it should be obvious that if it 
was a simple GetProcAddress that was failing, Python would simply throw 
an exception rather than displaying the ugly dialog box you see.

The problem is that some *other* DLL in the chain of dependencies is 
failing to load; please re-adjust your perceptions of your own knowledge 
and re-read John's initial response - if you follow his instructions 
that should all become quite obvious.

Mark


From aquil.abdullah at gmail.com  Mon Feb 23 16:54:06 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 13:54:06 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
Message-ID: <7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>

Hello All,
  So below is my naive attempt at the wrapper, it is only half baked
since I am no master at Interprocess communication... I know that it
is lacking a lot of things comment greatly appreciated:

#!/usr/bin/env python

import os, sys, re, exceptions
try:
    import subprocess
except ImportError:
    import popen2
    subprocess = None

PIPE = 10
SOUT = 11

class Runner:
    def __init__(self):
        self.stdout = None
        self.stdin = None
        self.stderr = None
        self.pid = None
        self.process = None

    def runCmdLine(self, args, executable=None, stdin=None,
stdout=None, stderr=None, preexec_fn=None,
                   close_fds=False, shell=False,cwd=None, env=None):
        """
        args -- a string, or a sequence of program arguments. The
argument to execute is
        normally the first item in the args sequence or the string if
a string is given,
        but can be explicitly set by using the executable argument.

        executable -- string to be executed

        stdin, stdout, stderr -- value of standard input, standard
output, and standard
        error file handles.  None implies no redirection. Valid values
are PIPE, an existing
        file descriptor (a positive integer), an existing file object,
and None.

        shell -- specifies whether command should be executed through
shell

        cwd -- specifies whether, childs current directory will be
changed to cwd

        env -- A map that specifies the environment variables in child
process
        that will be overwritten

        NOTE: Depending on the modules available, some arguments may
not be used.
        """
        if subprocess:
            # Use subprocess to exec functions
            if stdin == PIPE:
                sin = subprocess.PIPE
            else:
                # NOTE: User may input invalid values that will cause
exceptions
                sin = stdin
            if stdout == PIPE:
                sout = subprocess.PIPE
            else:
                sout = stdout
            if stderr == SOUT:
                serr = subprocess.STDOUT
            else:
                serr = stderr

            self.process = subprocess.Popen(args, stdin=sin,
stdout=sout, stderr=serr,
 
preexec_fn=preexec_fn,close_fds=close_fds, shell=shell,
                                            env=env, cwd=cwd)
            self.pid = self.process.pid
           # Add attributes stdin, stdout, and stderr
            self.stdin = self.process.stdin
            self.stdout = self.process.stdout
            self.stderr = self.process.stderr
        else:
            # Use popen2 to exec functions
            # Determine which form of popen2 to use
            if stderr == SOUT or stderr == None:
                self.process =  popen2.Popen4(args)
                self.stdin = self.process.tochild
                self.stdout = self.process.fromchild
                self.stderr = None
            else:
                self.process =  popen2.Popen3(args)
                self.stdin = self.process.tochild
                self.stdout = self.process.fromchild
                self.stderr = self.process.childerr

            self.pid = self.process.pid

    def wait(self,):
        """
        Waits for and returns the status code of the child process.
        """
        return self.process.wait()

    def poll(self,):
        """
        Returns -1 if the child process hasn't completed yet, or it's
return code
        otherwise
        """
        return self.process.poll()

Aquil

On Feb 23, 2:10?pm, Christian Heimes <li... at cheimes.de> wrote:
> aha wrote
>
> > def runner(cmd, stdin, stdout, ...):
> > ? try:
> > ? ? import subprocess
> > ? ? sbm = 1
> > ? except:
> > ? ? sbm = 0
>
> > ? # Now do something
> > ? if sbm:
> > ? ? process = subporcess(...)
> > ? else:
> > ? ? import popen2
> > ? ? process = popen2.Popen4(...)
>
> > Has anyone else run into a situation similar to this one?
>
> The canonical way for your try/except clause is:
>
> try:
> ? ? import subprocess
> except ImportError:
> ? ? subprocess = None
>
> ...
>
> if subprocess is not None:
> ? ? ...
> else:
> ? ? ...
>
> Christian



From bob at mellowood.ca  Mon Feb 23 17:05:42 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 15:05:42 -0700
Subject: more on unescaping escapes
Message-ID: <gnv6jn$4nh$1@news.motzarella.org>


So, we think something is working and send of a bug fix to our client :)

I'm not sure I understand this at all and wonder if there is bug?

 >>> a="c:\\Program\x20Files\\test"
 >>> a
'c:\\Program Files\\test'

so far, so good.

 >>> a.decode("string-escape")
'c:\\Program Files\test'

Umm, not so good? The \\ before the P is okay, but the \\t is change to \t

and

 >>> print a.decode("string-escape")
c:\Program Files        est

Now, decode() converted the \\t to a \t and print expanded the \t to a tab.

I would have thought that the \\t would have the same result as the \\P ???

Obviously my brain is missing something (hopefully obvious).



From python.list at tim.thechases.com  Mon Feb 23 17:06:58 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 16:06:58 -0600
Subject: Reading a tab delimited text file.
In-Reply-To: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
Message-ID: <49A31E02.3020108@tim.thechases.com>

> I would like to read a text file of numbers produced by a data
> acquisition system into three vectors of doubles. The contents of the
> file are:
> 
> +0.0000000e+0	+2.7645134e+1	+2.7745625e+1
> +0.4100041e-1	+2.7637787e+1	+2.7731047e+1
> +0.0820008e+0	+2.7645134e+1	+2.7750483e+1
> ...
> 
> or
> 
> +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> ...
> 
> I would like to read the first column into time_vec, second into
> ch1_vec and so on.
> 
> (I have never programmed in python and am having trouble finding a way
> to do this).

Well, a very terse way of doing it would be something like:

   time_vec, ch1_vec, and_so_on = zip(*(
     map(float, line.split())
     for line in file('in.txt')))

If my junior developer authored that, I'm not sure whether I'd 
laud her or fire her. :)

If this isn't homework, there are some less terse versions which 
are a bit easier on the eyes and less like some love-child 
between Perl and Python.

-tkc





From steve at holdenweb.com  Mon Feb 23 17:12:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:12:09 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <49A311C3.80707@gmail.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>	<gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com>
Message-ID: <gnv6vs$bm7$1@ger.gmane.org>

Michael Torrie wrote:
> Steve Holden wrote:
>> Unfortunately I have no idea what a "souq" is, so I suspect this may be
>> linguistically biased against English speakers. Or perhaps I'm just
>> ignorant.
> 
> Nah.  Not biased against English speakers.  Just biased against the
> un-traveled.  :)

Don't think so. I've visited roughly twenty-five difference countries
and traveled I-don't-know-how-many miles, but certainly over a million.
Unless you'd like to redefine "un-traveled" ... ?

But I do (still) speak English (of a kind).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 17:12:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:12:56 -0500
Subject: Top posting
In-Reply-To: <49A31327.60807@gmail.com>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>	<20090223135447.184e31bb.darcy@druid.net>	<49A2F926.5010207@gmail.com>	<20090223155557.c810d017.darcy@druid.net>
	<49A31327.60807@gmail.com>
Message-ID: <gnv71a$bm7$2@ger.gmane.org>

Stef Mientki wrote:
> 
>>> btw, it's also polite (in some cultures) to sign your messages ;-)
>>>     
>>
>> Hmm.  I appreciate that you took the time to remove my signature from
>> your reply but I don't think that you should then claim that I never
>> included one.
>>
>>   
> Sorry for that.
> 
> (now you get an idea how difficult it is for me to use the right posting
> guide lines)
> 
It gets easier the more you do it. Practice make perfect, y'know ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 17:14:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:14:15 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>	<gnuvfg$ejq$1@ger.gmane.org>
	<200902232126.54519.wolfgang@rohdewald.de>	<mailman.569.1235422680.11746.python-list@python.org>
	<9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>
Message-ID: <gnv73q$bm7$3@ger.gmane.org>

yatsek at gmail.com wrote:
> On Feb 23, 9:57 pm, Steve Holden <st... at holdenweb.com> wrote:
>> Wolfgang Rohdewald wrote:
>>> On Montag, 23. Februar 2009, Steve Holden wrote:
>>>> yat... at gmail.com wrote:
>>>>> Hi there.
>>>> [...]
>>>> Yatsek:
>>>> You just "hijacked a thread" by writing your question as a reply to
>>>> somebody else's post
>>> did he? His mail headers show no reference to any other mail AFAICS
>> No, apparently my newsreader just decided to mingle several threads for
>> no apparent reason. Bizarrely the thread now appears on its own even
>> though I haven't restarted Thunderbird.
>>
>> Yatsek, please accept my apologies.
>>
>> regards
>>  Steve
> 
> Thx, my bad.
> I was trying to correct spelling mistake by deleting older post just
> after it was posted and re-posting. Sorry about that.
> 
> By the way - don't you think that Google could ad this feature (re-
> editing post for some time after posting) and re-invent newsgroups
> making it a lot of better tool for communication?
> 
They probably could, but so far they don't even seem inclined to do much
about rampant spamming.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Mon Feb 23 17:17:42 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 19:17:42 -0300 (CLST)
Subject: Peculiar swap behavior
In-Reply-To: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com
	>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
Message-ID: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>

Delaney, Timothy (Tim) wrote:
> Tim Chase wrote:
>> # swap list contents...not so much...
>>  >>> m,n = [1,2,3],[4,5,6]
>>  >>> m[:],n[:] = n,m
>>  >>> m,n
>> ([4, 5, 6], [4, 5, 6])
[...]
> For these types of things, it's best to expand the code out. The
> appropriate expansion of:
>     m,n = [1,2,3],[4,5,6]
>     m[:],n[:] = n,m
> is:
>     m = [1,2,3]
>     n = [4,5,6]
>     m[:] = n
>     n[:] = m
> [...] OTOH, for:
>     m,n = [1,2,3],[4,5,6]
>     m[:],n[:] = n[:],m[:]
> the expansion is more like:
>     m = [1,2,3]
>     n = [4,5,6]
>     rhs1 = n[:]
>     rhs2 = m[:]
>     m[:] = rhs1
>     n[:] = rhs2

Maybe I'm just being stupid, but you don't seem to have explained
anything.  Isn't the question: Why is the expansion different for the two
cases?  Why don't both expand to have the intermediate rhs variables?

Andrew




From sedelblut at gmail.com  Mon Feb 23 17:17:44 2009
From: sedelblut at gmail.com (Stephen)
Date: Mon, 23 Feb 2009 14:17:44 -0800 (PST)
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
	<mailman.578.1235426821.11746.python-list@python.org>
Message-ID: <60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>

On Feb 23, 4:06?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > I would like to read a text file of numbers produced by a data
> > acquisition system into three vectors of doubles. The contents of the
> > file are:
>
> > +0.0000000e+0 ? ? ?+2.7645134e+1 ? +2.7745625e+1
> > +0.4100041e-1 ? ? ?+2.7637787e+1 ? +2.7731047e+1
> > +0.0820008e+0 ? ? ?+2.7645134e+1 ? +2.7750483e+1
> > ...
>
> > or
>
> > +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> > ...
>
> > I would like to read the first column into time_vec, second into
> > ch1_vec and so on.
>
> > (I have never programmed in python and am having trouble finding a way
> > to do this).
>
> Well, a very terse way of doing it would be something like:
>
> ? ?time_vec, ch1_vec, and_so_on = zip(*(
> ? ? ?map(float, line.split())
> ? ? ?for line in file('in.txt')))
>
> If my junior developer authored that, I'm not sure whether I'd
> laud her or fire her. :)
>
> If this isn't homework, there are some less terse versions which
> are a bit easier on the eyes and less like some love-child
> between Perl and Python.
>
> -tkc

haha, no this isn't homework. I'm a mechanical engineering student
working on a research project and this program is for my personal use
to analyze the data.


From aquil.abdullah at gmail.com  Mon Feb 23 17:20:04 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 14:20:04 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
Message-ID: <fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>

I've decided to change the runCmdLine method to Popen.
On Feb 23, 4:54?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? So below is my naive attempt at the wrapper, it is only half baked
> since I am no master at Interprocess communication... I know that it
> is lacking a lot of things comment greatly appreciated:
>
> #!/usr/bin/env python
>
> import os, sys, re, exceptions
> try:
> ? ? import subprocess
> except ImportError:
> ? ? import popen2
> ? ? subprocess = None
>
> PIPE = 10
> SOUT = 11
>
> class Runner:
> ? ? def __init__(self):
> ? ? ? ? self.stdout = None
> ? ? ? ? self.stdin = None
> ? ? ? ? self.stderr = None
> ? ? ? ? self.pid = None
> ? ? ? ? self.process = None
>
> ? ? def runCmdLine(self, args, executable=None, stdin=None,
> stdout=None, stderr=None, preexec_fn=None,
> ? ? ? ? ? ? ? ? ? ?close_fds=False, shell=False,cwd=None, env=None):
> ? ? ? ? """
> ? ? ? ? args -- a string, or a sequence of program arguments. The
> argument to execute is
> ? ? ? ? normally the first item in the args sequence or the string if
> a string is given,
> ? ? ? ? but can be explicitly set by using the executable argument.
>
> ? ? ? ? executable -- string to be executed
>
> ? ? ? ? stdin, stdout, stderr -- value of standard input, standard
> output, and standard
> ? ? ? ? error file handles. ?None implies no redirection. Valid values
> are PIPE, an existing
> ? ? ? ? file descriptor (a positive integer), an existing file object,
> and None.
>
> ? ? ? ? shell -- specifies whether command should be executed through
> shell
>
> ? ? ? ? cwd -- specifies whether, childs current directory will be
> changed to cwd
>
> ? ? ? ? env -- A map that specifies the environment variables in child
> process
> ? ? ? ? that will be overwritten
>
> ? ? ? ? NOTE: Depending on the modules available, some arguments may
> not be used.
> ? ? ? ? """
> ? ? ? ? if subprocess:
> ? ? ? ? ? ? # Use subprocess to exec functions
> ? ? ? ? ? ? if stdin == PIPE:
> ? ? ? ? ? ? ? ? sin = subprocess.PIPE
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? # NOTE: User may input invalid values that will cause
> exceptions
> ? ? ? ? ? ? ? ? sin = stdin
> ? ? ? ? ? ? if stdout == PIPE:
> ? ? ? ? ? ? ? ? sout = subprocess.PIPE
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? sout = stdout
> ? ? ? ? ? ? if stderr == SOUT:
> ? ? ? ? ? ? ? ? serr = subprocess.STDOUT
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? serr = stderr
>
> ? ? ? ? ? ? self.process = subprocess.Popen(args, stdin=sin,
> stdout=sout, stderr=serr,
>
> preexec_fn=preexec_fn,close_fds=close_fds, shell=shell,
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? env=env, cwd=cwd)
> ? ? ? ? ? ? self.pid = self.process.pid
> ? ? ? ? ? ?# Add attributes stdin, stdout, and stderr
> ? ? ? ? ? ? self.stdin = self.process.stdin
> ? ? ? ? ? ? self.stdout = self.process.stdout
> ? ? ? ? ? ? self.stderr = self.process.stderr
> ? ? ? ? else:
> ? ? ? ? ? ? # Use popen2 to exec functions
> ? ? ? ? ? ? # Determine which form of popen2 to use
> ? ? ? ? ? ? if stderr == SOUT or stderr == None:
> ? ? ? ? ? ? ? ? self.process = ?popen2.Popen4(args)
> ? ? ? ? ? ? ? ? self.stdin = self.process.tochild
> ? ? ? ? ? ? ? ? self.stdout = self.process.fromchild
> ? ? ? ? ? ? ? ? self.stderr = None
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? self.process = ?popen2.Popen3(args)
> ? ? ? ? ? ? ? ? self.stdin = self.process.tochild
> ? ? ? ? ? ? ? ? self.stdout = self.process.fromchild
> ? ? ? ? ? ? ? ? self.stderr = self.process.childerr
>
> ? ? ? ? ? ? self.pid = self.process.pid
>
> ? ? def wait(self,):
> ? ? ? ? """
> ? ? ? ? Waits for and returns the status code of the child process.
> ? ? ? ? """
> ? ? ? ? return self.process.wait()
>
> ? ? def poll(self,):
> ? ? ? ? """
> ? ? ? ? Returns -1 if the child process hasn't completed yet, or it's
> return code
> ? ? ? ? otherwise
> ? ? ? ? """
> ? ? ? ? return self.process.poll()
>
> Aquil
>
> On Feb 23, 2:10?pm, Christian Heimes <li... at cheimes.de> wrote:
>
> > aha wrote
>
> > > def runner(cmd, stdin, stdout, ...):
> > > ? try:
> > > ? ? import subprocess
> > > ? ? sbm = 1
> > > ? except:
> > > ? ? sbm = 0
>
> > > ? # Now do something
> > > ? if sbm:
> > > ? ? process = subporcess(...)
> > > ? else:
> > > ? ? import popen2
> > > ? ? process = popen2.Popen4(...)
>
> > > Has anyone else run into a situation similar to this one?
>
> > The canonical way for your try/except clause is:
>
> > try:
> > ? ? import subprocess
> > except ImportError:
> > ? ? subprocess = None
>
> > ...
>
> > if subprocess is not None:
> > ? ? ...
> > else:
> > ? ? ...
>
> > Christian
>
>



From mwilson at the-wire.com  Mon Feb 23 17:22:29 2009
From: mwilson at the-wire.com (Mel)
Date: Mon, 23 Feb 2009 17:22:29 -0500
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
Message-ID: <gnv7iq$u0q$1@services.telesweet.net>

Stephen wrote:

> Hi,
> 
> I would like to read a text file of numbers produced by a data
> acquisition system into three vectors of doubles. The contents of the
> file are:
> 
> +0.0000000e+0 +2.7645134e+1   +2.7745625e+1
> 
> +0.4100041e-1 +2.7637787e+1   +2.7731047e+1
> 
> +0.0820008e+0 +2.7645134e+1   +2.7750483e+1
> ...
> 
> or
> 
> +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> ...
> 
> I would like to read the first column into time_vec, second into
> ch1_vec and so on.
> 
> (I have never programmed in python and am having trouble finding a way
> to do this).

A simple starting point, without error handling, etc., could be:

a_list = []
b_list = []
c_list = []
for line in open ('my_numbers.txt', 'rt'):
    a, b, c = [float (x) for x in line.split()]
    a_list.append (a)
    b_list.append (b)
    c_list.append (c)

Assuming every line has three tab-separated numbers, the text versions of
the numbers are all convertable to float, the text file that's opened will
eventually be closed (whether by garbage collection or program
termination.)

This code does illustrate the string's split method, list comprehension,
sequence unpacking, and the fact that each of a_list, b_list, c_list *MUST*
be initialized with a distinct empty list object.

        Mel.




From google at mrabarnett.plus.com  Mon Feb 23 17:36:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 22:36:41 +0000
Subject: more on unescaping escapes
In-Reply-To: <gnv6jn$4nh$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
Message-ID: <49A324F9.4040201@mrabarnett.plus.com>

bvdp wrote:
> 
> So, we think something is working and send of a bug fix to our client :)
> 
> I'm not sure I understand this at all and wonder if there is bug?
> 
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
> 
> so far, so good.
> 
>  >>> a.decode("string-escape")
> 'c:\\Program Files\test'
> 
> Umm, not so good? The \\ before the P is okay, but the \\t is change to \t
> 
Decoding changes "\\x20" to "\x20", which is the same as " ", a space.

Decoding changes "\\t" to "\t", which is a tab.

Decoding _doesn't_ change "\\P" to "\P" because that's not a valid
escape sequence.

> and
> 
>  >>> print a.decode("string-escape")
> c:\Program Files        est
> 
> Now, decode() converted the \\t to a \t and print expanded the \t to a tab.
> 
\t is already a tab.

> I would have thought that the \\t would have the same result as the \\P ???
> 
> Obviously my brain is missing something (hopefully obvious).
> 
Before storing the string (writing it to the file), encode it and then
replace " " with "\\x20":

     C:\Program Files\test

becomes:

     C:\Program Files\test

and then:

     C:\\Program\x20Files\\test

After fetching the string (reading it from the file), decode it:

     C:\\Program\x20Files\\test

becomes:

     C:\Program Files\test



From python.list at tim.thechases.com  Mon Feb 23 17:45:12 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 16:45:12 -0600
Subject: Reading a tab delimited text file.
In-Reply-To: <60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>	<mailman.578.1235426821.11746.python-list@python.org>
	<60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
Message-ID: <49A326F8.5080202@tim.thechases.com>

>>    time_vec, ch1_vec, and_so_on = zip(*(
>>      map(float, line.split())
>>      for line in file('in.txt')))
>>
>> If this isn't homework, there are some less terse versions which
>> are a bit easier on the eyes and less like some love-child
>> between Perl and Python.
> 
> haha, no this isn't homework. I'm a mechanical engineering student
> working on a research project and this program is for my personal use
> to analyze the data.

The "zip-star map-float" variant is a pretty unreadable way to go.

The more readable versions look something like

   data = [map(float, line.split()) for line in file('in.txt')]
   time_vec = [bit[0] for bit in data]
   ch1_vec = [bit[1] for bit in data]
   and_so_on = [bit[2] for bit in data]

or even

   time_vec = []
   ch1_vec = []
   and_so_on = []
   for line in file('in.txt'):
     a,b,c = map(float, line.split())
     time_vec.append(a)
     ch1_vec.append(b)
     and_so_on.append(c)

which could also be written as

   for line in file('in.txt'):
     line = line.split()
     time_vec.append(float(line[0]))
     ch1_vec.append(float(line[1]))
     and_so_on.append(float(line[2]))

-tkc






From steve at holdenweb.com  Mon Feb 23 18:00:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 18:00:24 -0500
Subject: A tale of two execs
In-Reply-To: <fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>	<mailman.544.1235416507.11746.python-list@python.org>	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>
Message-ID: <gnv9qb$lc4$2@ger.gmane.org>

aha wrote:
> I've decided to change the runCmdLine method to Popen.
> [...]

So just exactly why was it necessary to follow this remark with about
three hundred lines of quoted text? And can't you put your replies at
the bottom rather than the top, please? And trim the stuff that isn't
required. It's simple courtesy to your readers.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From robert.kern at gmail.com  Mon Feb 23 18:00:50 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 23 Feb 2009 17:00:50 -0600
Subject: Peculiar swap behavior
In-Reply-To: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
	<474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
Message-ID: <gnv9r2$lkd$1@ger.gmane.org>

On 2009-02-23 16:17, andrew cooke wrote:
> Delaney, Timothy (Tim) wrote:
>> Tim Chase wrote:
>>> # swap list contents...not so much...
>>>   >>>  m,n = [1,2,3],[4,5,6]
>>>   >>>  m[:],n[:] = n,m
>>>   >>>  m,n
>>> ([4, 5, 6], [4, 5, 6])
> [...]
>> For these types of things, it's best to expand the code out. The
>> appropriate expansion of:
>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n,m
>> is:
>>      m = [1,2,3]
>>      n = [4,5,6]
>>      m[:] = n
>>      n[:] = m
>> [...] OTOH, for:
>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n[:],m[:]
>> the expansion is more like:
>>      m = [1,2,3]
>>      n = [4,5,6]
>>      rhs1 = n[:]
>>      rhs2 = m[:]
>>      m[:] = rhs1
>>      n[:] = rhs2
>
> Maybe I'm just being stupid, but you don't seem to have explained
> anything.  Isn't the question: Why is the expansion different for the two
> cases?  Why don't both expand to have the intermediate rhs variables?

n[:] on the RHS makes a copy of the list.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From nad at acm.org  Mon Feb 23 18:01:00 2009
From: nad at acm.org (Ned Deily)
Date: Mon, 23 Feb 2009 15:01:00 -0800
Subject: Python won't run
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
	<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>
	<nad-75A7C1.18281820022009@news.gmane.org>
Message-ID: <nad-99FB0F.15010023022009@news.gmane.org>

[Again, please reply-all to the list, don't send private email!]

On Feb 23, 2009, at 14:03 , kevin hayes wrote:
> Ned, system log didn't do anything when I tried to open IDLE. However, this 
> is what's in the console.log. does this tell you anything?
> 
> Unhandled server exception!
> Thread: SockThread
> Client Address:  ('127.0.0.1', 8833)
> Request:  <socket._socketobject object at 0x1087bc8>
> Traceback (most recent call last):
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 281, in _handle_request_noblock
>     self.process_request(request, client_address)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 307, in process_request
>     self.finish_request(request, client_address)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 320, in finish_request
>     self.RequestHandlerClass(request, client_address, self)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/rpc.p
> y", line 503, in __init__
>     SocketServer.BaseRequestHandler.__init__(self, sock, addr, svr)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 615, in __init__
>     self.handle()
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/run.p
> y", line 256, in handle
>     import IOBinding
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/IOBin
> ding.py", line 12, in <module>
>     import tempfile
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/tempfile.py",
>  line 34, in <module>
>     from random import Random as _Random
>   File "random.py", line 3, in <module>
>     import rand      # handy random-number functions
> ImportError: No module named rand
> 
> *** Unrecoverable, server exiting!
[...]

It looks like you have a file named random.py in your Documents 
directory.  IDLE.app adds ~/Documents to the front of sys.path, python's 
search path for modules.   Your random.py is being found before the 
standard library module, random, causing the idle server process to 
abort.  Rename your random.py* and all should be well for both 2.5 and 
2.6.

One could argue that IDLE.app should be smarter about situations like 
this.  It would be good to open an issue about this on the python 
tracker:
   http://bugs.python.org/

--
  Ned Deily
  nad at acm.org -- []

-- 
 Ned Deily,
 nad at acm.org



From tim.wintle at teamrubber.com  Mon Feb 23 18:13:14 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 23:13:14 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <49A31339.6080207@ulmcnett.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
	<49A31339.6080207@ulmcnett.com>
Message-ID: <1235430794.27699.131.camel@tim-laptop>

On Mon, 2009-02-23 at 13:20 -0800, Paul McNett wrote:
> tav wrote:
> > I'm keen to know your experiences even if you don't manage to write to
> > the filesystem -- and especially if you do!
> 
> Does it count when it breaks some standard libs that aren't even trying to write to 
> the filesystem?

It appears to prevent any imports from being allowed at all.

> 
> mac:ss pmcnett$ python sbs_studio.py pkm
> Traceback (most recent call last):
>    File "sbs_studio.py", line 159, in <module>
>      main()
>    File "sbs_studio.py", line 15, in main
>      parser = OptionParser()
>    File 
> "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
> 1191, in __init__
>      self.set_usage(usage)
>    File 
> "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
> 1266, in set_usage
>      self.usage = _("%prog [options]")
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 566, in gettext
>      return dgettext(_current_domain, message)
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 530, in dgettext
>      codeset=_localecodesets.get(domain))
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 465, in translation
>      mofiles = find(domain, localedir, languages, all=1)
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 437, in find
>      for nelang in _expand_lang(lang):
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 131, in _expand_lang
>      from locale import normalize
> ImportError: cannot import name normalize
> 
> Paul
> --
> http://mail.python.org/mailman/listinfo/python-list



From vincent at vincentdavis.net  Mon Feb 23 18:18:00 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 16:18:00 -0700
Subject: read csv error question
Message-ID: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>

I am trying to read a csv file from excel on a mac. I get the following
error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
field - do you need to open the file in universal-newline mode?
I was using the example code
import csv, sys

reader = csv.reader(open('/Volumes/vincentdavis
2/match/data/matchdata2008.csv', "rb"))
try:
    for row in reader:
        print row
except csv.Error, e:
    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))

I think this has to do with the end of line character but I am unsure how to
fix it. I don't what to change the actual csv file I would like to fix the
code.

Thanks
Vincent Davis
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From kyrie at uh.cu  Mon Feb 23 18:18:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 23 Feb 2009 18:18:10 -0500
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <200902231818.10603.kyrie@uh.cu>

On Monday 23 February 2009 03:50:57 pm tav wrote:
> Hey all,
>
> As an attempt to convince Python-Dev of the merits of a
> functions-based approach to security in Python, I've come up with a
> simple challenge.
>

While I'm almost excited that you are tackling the problem of python's 
security, I find that your approach seems to break too many things:

---
 >>> from safelite import FileReader
 >>> import numeric
 >>> print numeric
 None
 >>> import i_hope_this_doesnt_exists
 >>> print i_hope_this_doesnt_exists
 None
---

Versus:
---
 >>> import django
 >>> print django
 <module 'django' from '/usr/lib/python2.5/site-packages/django/__init__.pyc'>
 >>> import i_hope_this_doesnt_exists
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 ImportError: No module named i_hope_this_doesnt_exists
---

ipython also gets broken after the import (nothing works after the import).

Still, it seems interesting... 

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From clp2 at rebertia.com  Mon Feb 23 18:20:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 15:20:45 -0800
Subject: Peculiar swap behavior
In-Reply-To: <49A2EE60.1060300@tim.thechases.com>
References: <49A2EE60.1060300@tim.thechases.com>
Message-ID: <50697b2c0902231520jcf7d85dhf5add59889db3868@mail.gmail.com>

On Mon, Feb 23, 2009 at 10:43 AM, Tim Chase
<python.list at tim.thechases.com> wrote:
<snip>
> # swap list contents...not so much...
>>>> m,n = [1,2,3],[4,5,6]
>>>> m[:],n[:] = n,m
>>>> m,n
> ([4, 5, 6], [4, 5, 6])

Pseudo-C-Python expansion:
#evaluate RHS. simply *take pointers* since the RHS is just plain variables
ptr_n = &n
ptr_m = &m
#perform "assignments" to LHS
#remember that x[y] = z is really a method call to __setitem__ in disguise
#let's pseudo-expand the method calls
#also remember that the assignments must be serialized (Python isn't
magically parallel)
m._items  = (*ptr_n)._items #uh-oh! this just clobbered n._items!
since we only kept a pointer to n, n._items is now gone forever!
n._items = (*ptr_m)._items #uh-oh! this now has no real effect since
we clobbered m._items
#badness!

> The first two work as expected but the 3rd seems to leak some internal
> abstraction.  It seems to work if I force content-copying:
>
>>>> m[:],n[:] = n[:],m[:]

Pseudo-C-Python expansion:
#evaluate RHS. it's more complicated this time. this matters significantly!
#remember that x[y] is really a *method call* in disguise to __getitem__
#let's pseudo-expend the method-calls too
#note that we *make copies* instead of just taking pointers this time!
n_cpy = copy_list(n)
m_cpy = copy_list(m)
#same principles as before
m._items  = n_cpy._items #but we have a copy of m._items in m_cpy, so
m._items isn't lost forever!
n._items = m_cpy._items #yay, it works!
#huzzah

<snip>

> Is this a bug, something Python should smack the programmer for trying, or
> just me pushing the wrong edges? :)

Little from column A, little from column B. Using the swapping
assignment works slightly unintuitively with list slices because
copying doesn't magically take place; you need to do this copying
explicitly whereas it's sorta done for you with plain variable
swapping. Just keep in mind that container contents work
"by-reference" rather than "by-value", so to speak.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From woodygar at sky.com  Mon Feb 23 18:33:31 2009
From: woodygar at sky.com (Gary Wood)
Date: Mon, 23 Feb 2009 23:33:31 -0000
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
Message-ID: <E306DE3F7B904BF094575153877180B6@Woodygar>

'''exercise to complete and test this function'''
import string
def joinStrings(items):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
    for i in items:
       return (''.join(items))
       
def main():
    print(joinStrings(['very', 'hot','day']))
    print(joinStrings(['this', 'is','it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()


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From harijay at gmail.com  Mon Feb 23 18:37:36 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 15:37:36 -0800 (PST)
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
	<mailman.578.1235426821.11746.python-list@python.org>
	<60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
	<mailman.584.1235429116.11746.python-list@python.org>
Message-ID: <d97294dd-ba8f-4c29-b8ee-025ac3eaed1d@b16g2000yqb.googlegroups.com>

You could also use the csv module

import csv
myfileobj = open("myfiletab.txt","read")
csv_read = csv.reader(myfileobj,dialect=csv.excel_tab)
myval1 = []
myval2 = []
myval3 = []
for line in csv_read:
# filter header and stuff using some criterion
    if len(line) = 3:
      myval1.append(line[0])
      myval2.append(line[1])
      myval3.append(line[2])


etc etc . The csv module defines a dialect excel_tab. Each line is
then parsed into an array . You can insert that array into another
array and have an array line mydata = [ [line1],[line2] ...]

Hopw this helps
harijay

On Feb 23, 5:45?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> >> ? ?time_vec, ch1_vec, and_so_on = zip(*(
> >> ? ? ?map(float, line.split())
> >> ? ? ?for line in file('in.txt')))
>
> >> If this isn't homework, there are some less terse versions which
> >> are a bit easier on the eyes and less like some love-child
> >> between Perl and Python.
>
> > haha, no this isn't homework. I'm a mechanical engineering student
> > working on a research project and this program is for my personal use
> > to analyze the data.
>
> The "zip-star map-float" variant is a pretty unreadable way to go.
>
> The more readable versions look something like
>
> ? ?data = [map(float, line.split()) for line in file('in.txt')]
> ? ?time_vec = [bit[0] for bit in data]
> ? ?ch1_vec = [bit[1] for bit in data]
> ? ?and_so_on = [bit[2] for bit in data]
>
> or even
>
> ? ?time_vec = []
> ? ?ch1_vec = []
> ? ?and_so_on = []
> ? ?for line in file('in.txt'):
> ? ? ?a,b,c = map(float, line.split())
> ? ? ?time_vec.append(a)
> ? ? ?ch1_vec.append(b)
> ? ? ?and_so_on.append(c)
>
> which could also be written as
>
> ? ?for line in file('in.txt'):
> ? ? ?line = line.split()
> ? ? ?time_vec.append(float(line[0]))
> ? ? ?ch1_vec.append(float(line[1]))
> ? ? ?and_so_on.append(float(line[2]))
>
> -tkc

Another way would be to use the csv module .

import csv
f = file.open("mytabfile.txt"


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 18:38:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 21:38:37 -0200
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
	<02ed27ed-4b4f-41b2-b4b8-7914d3f13674@v39g2000yqm.googlegroups.com>
Message-ID: <op.uptvyn0jx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 18:10:07 -0200, Lionel <lionel.keene at gmail.com>  
escribi?:

> Taking "DataFileTypes.py" module out of the "...\site-packages
> \DataFileTypes" folder and placing it directly into the "site-
> packages" folder seems to have cleared it up. Some problem between
> package and module usage I suppose.

You're right. To import module "foo", the directory containing the  
"foo.py" file must be listed in sys.path.
To import package "foo", the directory containing the "foo" directory must  
be listed in sys.path; the foo directory itself must contain an  
"__init__.py" file.

-- 
Gabriel Genellina



From andrew at acooke.org  Mon Feb 23 18:41:55 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 20:41:55 -0300 (CLST)
Subject: Peculiar swap behavior
In-Reply-To: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
	<474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
Message-ID: <c5d3da56fc059e0d3caaf81668870c6e.squirrel@acooke.dyndns.org>

andrew cooke wrote:
> Delaney, Timothy (Tim) wrote:
>> Tim Chase wrote:
>>> # swap list contents...not so much...
>>>  >>> m,n = [1,2,3],[4,5,6]
>>>  >>> m[:],n[:] = n,m
>>>  >>> m,n
>>> ([4, 5, 6], [4, 5, 6])
> [...]
>> For these types of things, it's best to expand the code out. The
>> appropriate expansion of:
>>     m,n = [1,2,3],[4,5,6]
>>     m[:],n[:] = n,m
>> is:
>>     m = [1,2,3]
>>     n = [4,5,6]
>>     m[:] = n
>>     n[:] = m
>> [...] OTOH, for:
>>     m,n = [1,2,3],[4,5,6]
>>     m[:],n[:] = n[:],m[:]
>> the expansion is more like:
>>     m = [1,2,3]
>>     n = [4,5,6]
>>     rhs1 = n[:]
>>     rhs2 = m[:]
>>     m[:] = rhs1
>>     n[:] = rhs2
>
> Maybe I'm just being stupid, but you don't seem to have explained
> anything.  Isn't the question: Why is the expansion different for the two
> cases?  Why don't both expand to have the intermediate rhs variables?

To answer my own question - you can rewrite all cases to use rhs1, rhs2.

The point is that when you do that: one case (m, n = n, m) reassigns
variables; one case (m[:], n[:] = n, m) mutates one list to be equal to
the other; one case (m[:], n[:] = n[:], m[:]) avoids seeing the effects of
the mutation because a copy is generated.

Which is what other people said, I guess.

Andrew




From rdmurray at bitdance.com  Mon Feb 23 18:42:39 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 23 Feb 2009 23:42:39 +0000 (UTC)
Subject: read csv error question
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
Message-ID: <gnvc9f$t4i$1@ger.gmane.org>

Vincent Davis <vincent at vincentdavis.net> wrote:
> I am trying to read a csv file from excel on a mac. I get the following
> error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
> field - do you need to open the file in universal-newline mode?
> I was using the example code
> import csv, sys
> 
> reader = csv.reader(open('/Volumes/vincentdavis
> 2/match/data/matchdata2008.csv', "rb"))
> try:
>     for row in reader:
>         print row
> except csv.Error, e:
>     sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
> I think this has to do with the end of line character but I am unsure how to
> fix it. I don't what to change the actual csv file I would like to fix the
> code.

You could try reading the error message and looking at the documentation
of the 'open' function.  Pay particular attention to the keywords
'universal-newline mode'.

Hint: 'rb' is almost the opposite of universal newline mode, and
it is very rare that you'd want to use 'b' to read a text file.

--RDM



From google at mrabarnett.plus.com  Mon Feb 23 18:43:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 23:43:05 +0000
Subject: read csv error question
In-Reply-To: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
Message-ID: <49A33489.7060501@mrabarnett.plus.com>

Vincent Davis wrote:
> I am trying to read a csv file from excel on a mac. I get the following 
> error.
> SystemExit: file some.csv, line 1: new-line character seen in unquoted 
> field - do you need to open the file in universal-newline mode?
> I was using the example code
> import csv, sys
> 
> reader = csv.reader(open('/Volumes/vincentdavis 
> 2/match/data/matchdata2008.csv', "rb"))
> try:
>     for row in reader:
>         print row
> except csv.Error, e:
>     sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
> I think this has to do with the end of line character but I am unsure 
> how to fix it. I don't what to change the actual csv file I would like 
> to fix the code.
> 
FYI, Mac line endings are carriage-return '\r', Linux line endings are 
linefeed '\n', and Windows endings are _both_ '\r\n'.

Try:

     reader = csv.reader(open('/Volumes/vincentdavis 
2/match/data/matchdata2008.csv', "U")) # or "rU"

This will open the file for reading with "universal" line ending
support, which will accept any kind of these line endings. (Opening it
in text mode "r" should also work, assuming that the .csv file does
indeed have the correct line endings for that platform.)


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 18:47:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 21:47:46 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
	<6D420E20-FFC0-407B-ADCD-10D541E8C3CA@bryant.edu>
Message-ID: <op.uptwdwukx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 17:17:04 -0200, Brian Blais <bblais at bryant.edu>  
escribi?:
> On Feb 23, 2009, at 3:03 , Gabriel Genellina wrote:
>> En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak
>> <denis.kasak at gmail.com> escribi?:
>>> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
>>> <steven at remove.this.cybersource.com.au> wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>>>
>>>> def swap(x, y):
>>>>    y, x = x, y
>>>>
>>>> a = 1
>>>> b = 2
>>>> swap(a, b)
>>>> assert a == 2 and b == 1
>>>>
>>>>
>>>> but you can't, it does not work. Ergo, parameter passing in
>>>> Python does
>>>> not have the same semantics as languages that use pass-by-
>>>> reference, such
>>>> as Pascal and Basic.
>>>
>>> You could, however, argue that the swap function doesn't work as
>>> expected (e.g. from a Pascal or a C++ POV) simply because the
>>> underlying objects aren't mutable.
>>
>> That's irrelevant - mutable and immutable objects are passed
>> exactly the same way.
>
> I don't think they were saying that mutable and immutable objects
> were handled differently.  They are different in terms of what a
> function can do to them (mutate them or no). Thus, if you can't
> mutate them, then the caller can't see any changes in the objects by
> actions in the function so the swap won't work: it doesn't mutate the
> objects at all.  In the case of a list or a dict, then one can mutate
> them, and the changes are seen in the caller.  In both cases, the
> object itself is passed the same way.

Ok, in any case, making such claims without explanation or restricting the  
sense, only confuses the matter (which is innecesarily confusing  
already...)

-- 
Gabriel Genellina



From benjamin.kaplan at case.edu  Mon Feb 23 18:52:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 23 Feb 2009 18:52:43 -0500
Subject: read csv error question
In-Reply-To: <49A33489.7060501@mrabarnett.plus.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
Message-ID: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>

On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:

> Vincent Davis wrote:
>
>> I am trying to read a csv file from excel on a mac. I get the following
>> error.
>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>> field - do you need to open the file in universal-newline mode?
>> I was using the example code
>> import csv, sys
>>
>> reader = csv.reader(open('/Volumes/vincentdavis
>> 2/match/data/matchdata2008.csv', "rb"))
>> try:
>>    for row in reader:
>>        print row
>> except csv.Error, e:
>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>
>> I think this has to do with the end of line character but I am unsure how
>> to fix it. I don't what to change the actual csv file I would like to fix
>> the code.
>>
>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
> linefeed '\n', and Windows endings are _both_ '\r\n'.
>

Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
Unix-based so it uses line feeds.



>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bob at mellowood.ca  Mon Feb 23 19:00:36 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:00:36 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.583.1235428603.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
Message-ID: <gnvdb6$mf6$1@news.motzarella.org>


I'm getting hopelessly lost in a series of \\\\\\\ s :)

Let's see if this makes sense:

 >>> a='c:\\Program Files\\test'
 >>> a.decode('string-escape')
'c:\\Program Files\test'

In this case there are still 2 '\'s before the P; but only 1 before the 
't'. Now, when it comes time to open the file windows accepts double 
'\'s in the filename. So, life is fine. But, the essential part here is 
that we're lucky we can use '\\' or '\' in a path. What if this wasn't true?

The following shows a bit of difference:

 >>> a='c:\Program Files\test'
 >>> a
'c:\\Program Files\test'

In this case the interpreter has changed the '\P' to '\\P'. And if one 
lists the string the '\t' really is a tab. No decode() at all in any of 
this.

I guess the general rule would be to double up '\'s in filenames and (in 
my program's case) to use the \x20 for spaces.

Thanks.


From vincent at vincentdavis.net  Mon Feb 23 19:02:31 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 17:02:31 -0700
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <77e831100902231602v754d7ccbu4a36cb91aee08e1a@mail.gmail.com>

Thanks for the help the "U" was what I needed. I was reading the
documentation here.http://docs.python.org/library/csv.html
but I could not find the term universal-newline mode, In fact where do you
find "U" I have not read it word for word but it is not obvious to me. I do
even see anything about "rb" but I might just be really blind.

Thanks again

Vincent Davis



On Mon, Feb 23, 2009 at 4:52 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>>
>>> I am trying to read a csv file from excel on a mac. I get the following
>>> error.
>>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>>> field - do you need to open the file in universal-newline mode?
>>> I was using the example code
>>> import csv, sys
>>>
>>> reader = csv.reader(open('/Volumes/vincentdavis
>>> 2/match/data/matchdata2008.csv', "rb"))
>>> try:
>>>    for row in reader:
>>>        print row
>>> except csv.Error, e:
>>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>>
>>> I think this has to do with the end of line character but I am unsure how
>>> to fix it. I don't what to change the actual csv file I would like to fix
>>> the code.
>>>
>>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
>> linefeed '\n', and Windows endings are _both_ '\r\n'.
>>
>
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
> Unix-based so it uses line feeds.
>
>
>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From vincent at vincentdavis.net  Mon Feb 23 19:05:55 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 17:05:55 -0700
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <77e831100902231605x50919aq472171c709136228@mail.gmail.com>

I just thought to look in the documentation for open() It seems this may
contain the answers to my questions. I am just to new to python to know
where my problem is,
Thanks
Vincent Davis
720-301-3003


On Mon, Feb 23, 2009 at 4:52 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>>
>>> I am trying to read a csv file from excel on a mac. I get the following
>>> error.
>>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>>> field - do you need to open the file in universal-newline mode?
>>> I was using the example code
>>> import csv, sys
>>>
>>> reader = csv.reader(open('/Volumes/vincentdavis
>>> 2/match/data/matchdata2008.csv', "rb"))
>>> try:
>>>    for row in reader:
>>>        print row
>>> except csv.Error, e:
>>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>>
>>> I think this has to do with the end of line character but I am unsure how
>>> to fix it. I don't what to change the actual csv file I would like to fix
>>> the code.
>>>
>>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
>> linefeed '\n', and Windows endings are _both_ '\r\n'.
>>
>
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
> Unix-based so it uses line feeds.
>
>
>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From google at mrabarnett.plus.com  Mon Feb 23 19:08:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 24 Feb 2009 00:08:51 +0000
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <49A33A93.7080403@mrabarnett.plus.com>

Benjamin Kaplan wrote:
> 
> 
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com 
> <mailto:google at mrabarnett.plus.com>> wrote:
> 
>     Vincent Davis wrote:
> 
>         I am trying to read a csv file from excel on a mac. I get the
>         following error.
>         SystemExit: file some.csv, line 1: new-line character seen in
>         unquoted field - do you need to open the file in
>         universal-newline mode?
>         I was using the example code
>         import csv, sys
> 
>         reader = csv.reader(open('/Volumes/vincentdavis
>         2/match/data/matchdata2008.csv', "rb"))
>         try:
>            for row in reader:
>                print row
>         except csv.Error, e:
>            sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
>         I think this has to do with the end of line character but I am
>         unsure how to fix it. I don't what to change the actual csv file
>         I would like to fix the code.
> 
>     FYI, Mac line endings are carriage-return '\r', Linux line endings
>     are linefeed '\n', and Windows endings are _both_ '\r\n'.
> 
> 
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X 
> is Unix-based so it uses line feeds.
> 
Slightly OT, but PPD files on Macs used to work whatever the line
endings (as they should, according to the spec), but at some point on
MacOS X they broke that and PPD files would work only with CR line
endings. I don't know if they've fixed that. Anyway, although it's Unix
underneath I'm not so sure that they don't use CR line endings elsewhere
for backwards compatibility.


From andrew at acooke.org  Mon Feb 23 19:10:31 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 21:10:31 -0300 (CLST)
Subject: more on unescaping escapes
In-Reply-To: <gnvdb6$mf6$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
Message-ID: <1e4355c5c39776c0e4364f9becf45acc.squirrel@localhost>


do you know that a string with the letter "r" in front doesn't escape
slashes?  it's intended for regular expressions, but would simplify things
for you here too.

just do

  a=r'c:\\Program Files\test'

andrew


bvdp wrote:
>
> I'm getting hopelessly lost in a series of \\\\\\\ s :)
>
> Let's see if this makes sense:
>
>  >>> a='c:\\Program Files\\test'
>  >>> a.decode('string-escape')
> 'c:\\Program Files\test'
>
> In this case there are still 2 '\'s before the P; but only 1 before the
> 't'. Now, when it comes time to open the file windows accepts double
> '\'s in the filename. So, life is fine. But, the essential part here is
> that we're lucky we can use '\\' or '\' in a path. What if this wasn't
> true?
>
> The following shows a bit of difference:
>
>  >>> a='c:\Program Files\test'
>  >>> a
> 'c:\\Program Files\test'
>
> In this case the interpreter has changed the '\P' to '\\P'. And if one
> lists the string the '\t' really is a tab. No decode() at all in any of
> this.
>
> I guess the general rule would be to double up '\'s in filenames and (in
> my program's case) to use the \x20 for spaces.
>
> Thanks.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:11:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:11:54 -0200
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
Message-ID: <op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 15:54:03 -0200, <rdmurray at bitdance.com> escribi?:
> Stef Mientki <stef.mientki at gmail.com> wrote:

>> but I was looking for a more general solution,
>> in which I don't change the program itself,
>> and where the error messages (in general) become more informative than
>> it is by default.
> No you are not the only one who wishes the error messages were
> more informative.  In one complex application I had, I made my life
> easier with a hack I copied from Zope.  Briefly, at the top level
> of the program I trap all exceptions, get the traceback object from
> sys.exc_info, format it with format_tb, and then process it to add info.
> I applied several enhancements, but the one relevant to you was to grab
> the locals dictionary from the last frame of the traceback, and use a
> regex to split the last source line in the formatted traceback up into
> candidate variable names.  Then I printed the name and the repr of the
> value of any of those names I found in the locals dict.

Have you seen the cgitb module? Despite its name, it's a general purpose  
module.

<http://docs.python.org/library/cgitb.html>

<code>
import cgitb
cgitb.enable(format="txt")

def f(some_list, x, y):
   return some_list[x + y]

def g(a):
   return f(a, 1, 2) - f(a, 3, 4)

g([1,2,3,4])

</code>

Output:
<type 'exceptions.IndexError'>
Python 2.6: c:\apps\python26\python.exe
Mon Feb 23 22:06:22 2009

A problem occurred in a Python script.  Here is the sequence of function  
calls leading up to the error, in the order they occurred.

  C:\TEMP\test_cgitb.py in <module>()
     8   return f(a, 1, 2) - f(a, 3, 4)
     9
    10 g([1,2,3,4])
    11
    12
g = <function g at 0x00B9FB70>

  C:\TEMP\test_cgitb.py in g(a=[1, 2, 3, 4])
     6
     7 def g(a):
     8   return f(a, 1, 2) - f(a, 3, 4)
     9
    10 g([1,2,3,4])
global f = <function f at 0x00B9FB30>
a = [1, 2, 3, 4]

  C:\TEMP\test_cgitb.py in f(some_list=[1, 2, 3, 4], x=3, y=4
)
     3
     4 def f(some_list, x, y):
     5   return some_list[x + y]
     6
     7 def g(a):
some_list = [1, 2, 3, 4]
x = 3
y = 4
<type 'exceptions.IndexError'>: list index out of range
     __class__ = <type 'exceptions.IndexError'>
     [..]
     args = ('list index out of range',)
     message = 'list index out of range'

The above is a description of an error in a Python program. Here is the  
original traceback:

Traceback (most recent call last):
   File "test_cgitb.py", line 10, in <module>
     g([1,2,3,4])
   File "test_cgitb.py", line 8, in g
     return f(a, 1, 2) - f(a, 3, 4)
   File "test_cgitb.py", line 5, in f
     return some_list[x + y]
IndexError: list index out of range


-- 
Gabriel Genellina



From tim.wintle at teamrubber.com  Mon Feb 23 19:13:06 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 24 Feb 2009 00:13:06 +0000
Subject: more on unescaping escapes
In-Reply-To: <gnvdb6$mf6$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
Message-ID: <1235434386.6125.4.camel@tim-laptop>

On Mon, 2009-02-23 at 17:00 -0700, bvdp wrote:
> Let's see if this makes sense:
> 
>  >>> a='c:\\Program Files\\test'
>  >>> a.decode('string-escape')
> 'c:\\Program Files\test'

Hint: try running

>>> print a

and see what's written - I think that the interpreter adds extra "\"
characters to escape things and make things more easy to read.

i.e. 

>>> a = "c:\\test\\t"
>>> a
'c:\\test\\t'
>>> print a
c:\test\t
>>> 

so when it displays strings in the interpreter it includes escape
characters, when it is printed though the output is straight to stdout
and isn't escaped.

Hope that helps,

Tim Wintle




From bob at mellowood.ca  Mon Feb 23 19:18:24 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:18:24 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.602.1235434237.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.602.1235434237.11746.python-list@python.org>
Message-ID: <gnvecg$mc$1@news.motzarella.org>

andrew cooke wrote:
> do you know that a string with the letter "r" in front doesn't escape
> slashes?  it's intended for regular expressions, but would simplify things
> for you here too.
> 
> just do
> 
>   a=r'c:\\Program Files\test'
> 

Yes, I knew that. Unfortunately in my program loop I really don't have 
the opportuity to use a raw string.

But, good reminder. Thanks.



From harijay at gmail.com  Mon Feb 23 19:18:31 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 16:18:31 -0800 (PST)
Subject: getting at individual bits inside byte field: struct module : bitwise
	operator
Message-ID: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>

In my last post I had asked about reading data from a binary file
using the struct module.
Thanks to some excellent help , I have managed to read in
successfully
most of the header of this binary format that I want to parse.  These
are some time-voltage traces from a digital
to analog converter for my experiments. The output is according to a
format
mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)

I have a question about how to bitmask a bunch of bytes read in from
such a binary formatted file .

For eg the spec says the first two bytes have different parameters in
different bits .
Byte 1                                                  Byte 0
SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
SD2     SD1     SD0     T4      T3      T2      T1      T0

I am reading in the two bytes using the following code

import struct
f.seek(0)
element1_format = struct.Struct("<H")
(element1,) = element1_format.unpack(f.read(2))

Now element1 has type "str" . How do I apply a bitmask to this to get
at information in the component bits .
Since the entire file format has many such bitmasked fields and since
this is my first venture into binary formats and c-type structs , I
wanted to know how to read values inside a byte using python.
My few tries at using bitwise operators ( element1 & 0x001f) are
frustrated by messages that say " unsupported operand type(s) for &:
'str' and 'int' " .
How can I keep my string objects as bits and apply bitmasks to them
Any help in this will be greatly appreciated.
Thanks
hari


From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:18:50 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:18:50 -0000
Subject: "import" not working?
In-Reply-To: <da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
Message-ID: <op.uptxtoora8ncjz@gnudebst>

On Mon, 23 Feb 2009 19:24:46 -0000, Lionel <lionel.keene at gmail.com> wrote:

> sys.path.append("C:\DataFileTypes")

Just so that we're clear, this is a *really* *bad* habit to get
into.  Not appending to sys.path, though that isn't often a good
idea, but failing to escape your backslashes.  This works because
'\D' happens not to be a valid escape sequence: if your directory
had instead been called "newtypes" then "C:\newtypes" would not
have had the result you were expecting at all.  If you really
mean a backslash to be in any literal string, you should always
double it:

sys.path.append("C:\\DataFileTypes")

IMHO, Python is somewhat inconsistent in not producing a
compile-type error (or at least an annoying compile-time
warning) when presented with invalid escape sequences.
What it does, even though it's well-documented and usually
the right guess, is to encourage bad habits.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 23 19:19:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:19:19 -0800
Subject: Need to store dictionary in file
In-Reply-To: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
References: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
Message-ID: <50697b2c0902231619ub603332w1890bdbd68f7f455@mail.gmail.com>

On Mon, Feb 23, 2009 at 12:38 PM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
>
> I have a dictionary in which each key is associated with a list as value.
>
> eg: dic={'a':['aa','ant','all']}
>
> The dictionary contains 1.5 lakh keys.

Tip: You might not want to use the "lakh" in international media such
as internet mailinglists since it's rather
Indian-subcontinent-specific and most people will be unfamiliar with
it.
I only know of it from coincidentally editing the Wikipedia article on
it a while ago.

To everyone else, that's 150,000 keys (150K if you wanna be metric about it).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Mon Feb 23 19:23:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:23:54 -0800
Subject: Can someone tell me why i get None at the end please this has me 
	stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <50697b2c0902231623v6cb1c137u1d52897f1c4ec576@mail.gmail.com>

On Mon, Feb 23, 2009 at 11:22 AM, Gary Wood <woodygar at sky.com> wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>
>
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()

Reiterating myself from your previous thread which this is a duplicate of:

You're not supposed to *output* the strings in joinStrings() [i.e.
don't use print()!], you've supposed to *combine* them and *return*
the single combined string (it's nearly identical to how you summed
the numbers in the earlier exercise). The actual outputting of the
combined string is done by the calls to print() *outside* of
joinStrings(), in main().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 19:26:29 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:26:29 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.604.1235434399.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
Message-ID: <gnvern$6a5$1@news.motzarella.org>

Tim Wintle wrote:
> On Mon, 2009-02-23 at 17:00 -0700, bvdp wrote:
>> Let's see if this makes sense:
>>
>>  >>> a='c:\\Program Files\\test'
>>  >>> a.decode('string-escape')
>> 'c:\\Program Files\test'
> 
> Hint: try running
> 
>>>> print a
> 
> and see what's written - I think that the interpreter adds extra "\"
> characters to escape things and make things more easy to read.
> 
> i.e. 
> 
>>>> a = "c:\\test\\t"
>>>> a
> 'c:\\test\\t'
>>>> print a
> c:\test\t
> 
> so when it displays strings in the interpreter it includes escape
> characters, when it is printed though the output is straight to stdout
> and isn't escaped.
> 
> Hope that helps,
> 
> Tim Wintle

Not sure if it's more clear or not :)

 >>> a="c:\\Program\x20Files\\test"
 >>> a
'c:\\Program Files\\test'
 >>> print a
c:\Program Files\test

Which is all fine. And I didn't need to use decode().

So, in this case I'm assuming that the interpreter is converting the 
escapes on assignment. And, in this case the string has single \s in it.

So far this is making sense. So, when I do a decode() the \t is 
converted to a tab, etc.

I think my "problem" may be in viewing an assignment like that above as 
opposed to reading a line from a file with '\'s and '\x20's in it. In 
this case the assignment doesn't do the conversion (and that is a good 
thing!). Now, when I go to save the variable with the escapes I use 
decode() and it works.

Just a matter of consistantly using a method I suppose. Still, confusing 
between my program reading data from a file and doing testing of strings 
at the interpreter. Best to do one or the other, not both.







From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:32:18 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:32:18 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnv6jn$4nh$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
Message-ID: <op.uptyf4z1a8ncjz@gnudebst>

On Mon, 23 Feb 2009 22:05:42 -0000, bvdp <bob at mellowood.ca> wrote:

>
> So, we think something is working and send of a bug fix to our client :)
>
> I'm not sure I understand this at all and wonder if there is bug?
>
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
>
> so far, so good.
>
>  >>> a.decode("string-escape")
> 'c:\\Program Files\test'
>
> Umm, not so good? The \\ before the P is okay, but the \\t is change to  
> \t

Well yes, that's what you asked it to do.  The "string-escape" decoder
reads the string and replaces escape sequences with the corresponding
characters.  Bear in mind that it's the string as it really is that is
being operated on, not the representation of it that you displayed
above.  In other words:

b = a.decode("string-escape")

is equivalent to:

b = "C:\Program Files\test"

"\P" isn't a valid escape sequence, so it doesn't get replaced.  "\t"
represents a tab, so it does.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 23 19:32:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:32:48 -0800
Subject: intermediate python csv reader/writer question from a beginner
In-Reply-To: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
References: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
Message-ID: <50697b2c0902231632s76bfb28gff055b92bf725411@mail.gmail.com>

On Mon, Feb 23, 2009 at 1:33 PM, Learning Python <labmice at gmail.com> wrote:
> anything related to csv, I usually use VB within excel to manipulate
> the data, nonetheless, i finally got the courage to take a dive into
> python.  i have viewed a lot of googled csv tutorials, but none of
> them address everything i need.  Nonetheless, I was wondering if
> someone can help me manipulate the sample csv (sample.csv) I have
> generated:

For reading and writing CSV files, see the `csv` module in the
standard library (http://docs.python.org/library/csv.html).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:35:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:35:14 -0200
Subject: Can someone tell me why i get None at the end please this has me
	stuck for ages
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <op.uptyk0eyx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 17:22:16 -0200, Gary Wood <woodygar at sky.com> escribi?:

> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()

See this:

py> def sum(a, b):
...   "Returns the sum of two numbers"
...   print a+b
...
py> print sum(2,3)
5
None

The function above does *not* do what is expected. It should compute a+b  
AND RETURN THE RESULT (instead, it PRINTS the result and returns nothing,  
None in Python parlance). It's up to the caller to decide what to do with  
the resultant value; if he wants to print it, fine; but maybe he wants to  
carry on other operations:

py> print sum(2,3) * 4
5
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

If the function claims to *return* something, it should return that thing:

py> def sum(a, b):
...   "Returns the sum of two numbers"
...   return a+b
...
py> print sum(2,3)
5
py> print sum(2,3) * 4
20

Back to your exercise, you have to join the strings together WITHOUT USING  
PRINT. You have to build a NEW string, joining the pieces one by one, and  
return the new, concatenated string. If I'm not mistaken, there were some  
clues in the exercise statement that you're ignoring and should help a lot.

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:37:11 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:37:11 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnvern$6a5$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <op.uptyn9y7a8ncjz@gnudebst>

On Tue, 24 Feb 2009 00:26:29 -0000, bvdp <bob at mellowood.ca> wrote:

> So, in this case I'm assuming that the interpreter is converting the  
> escapes on assignment.

The compiler converts the escapes on creating its internal
representation of the string, before assignment ever gets
involved.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python at bdurham.com  Mon Feb 23 19:37:15 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 23 Feb 2009 19:37:15 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1235435835.25504.1302013015@webmail.messagingengine.com>

Gabriel,

> Have you seen the cgitb module? Despite its name, it's a general purpose module.
> <http://docs.python.org/library/cgitb.html>
> 
> import cgitb
> cgitb.enable(format="txt")
> 
> <snipped>

My vote for tip of the week, perhaps even month.

I'm not part of this thread, but your post is a great help on another
project.

Thank you!

Regards,
Malcolm


From google at mrabarnett.plus.com  Mon Feb 23 19:40:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 24 Feb 2009 00:40:09 +0000
Subject: getting at individual bits inside byte field: struct module :
	bitwise	operator
In-Reply-To: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <49A341E9.8080107@mrabarnett.plus.com>

harijay wrote:
> In my last post I had asked about reading data from a binary file
> using the struct module.
> Thanks to some excellent help , I have managed to read in
> successfully
> most of the header of this binary format that I want to parse.  These
> are some time-voltage traces from a digital
> to analog converter for my experiments. The output is according to a
> format
> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
> 
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
> 
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
> 
> I am reading in the two bytes using the following code
> 
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
> 
> Now element1 has type "str" .

That's not what I get. For me it's an int.

> How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .
> How can I keep my string objects as bits and apply bitmasks to them
> Any help in this will be greatly appreciated.
 >
The T bits are (element1 & 0x1F), the SD bits are ((element1 >> 5) &
0x2FF) and the SN16 bit is (element1 >> 15).


From clp2 at rebertia.com  Mon Feb 23 19:41:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:41:50 -0800
Subject: more on unescaping escapes
In-Reply-To: <gnvern$6a5$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <50697b2c0902231641l5f0938c5j59441cc8400ed560@mail.gmail.com>

On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
[problem with Python and Windows paths using backslashes]

Is there any particular reason you can't just internally use regular
forward-slashes for the paths? They work in Windows from Python in
nearly all cases and you can easily interconvert using os.pathsep if
you want the path to be pretty when you show it to (or get it from)
the user or whatever.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 19:46:34 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:46:34 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.614.1235436113.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
Message-ID: <gnvg1a$g7g$1@news.motzarella.org>

Chris Rebert wrote:
> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
> [problem with Python and Windows paths using backslashes]
> 
> Is there any particular reason you can't just internally use regular
> forward-slashes for the paths? They work in Windows from Python in
> nearly all cases and you can easily interconvert using os.pathsep if
> you want the path to be pretty when you show it to (or get it from)
> the user or whatever.
> 
> Cheers,
> Chris
> 

Just because I never really thought too much about it :) I'm doing my 
work on a linux box and my user is on windows ... and he's used to using 
'\' ... but, you are absolutely right! Just use '/' on both systems and 
be done with it. Of course I still need to use \x20 for spaces, but that 
is easy.

Thanks for the suggestion!


From bob at mellowood.ca  Mon Feb 23 19:48:32 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:48:32 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.608.1235435546.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.608.1235435546.11746.python-list@python.org>
Message-ID: <gnvg50$g7g$2@news.motzarella.org>


> Bear in mind that it's the string as it really is that is
> being operated on, not the representation of it that you displayed

Yes, that is the confusion ... what is displayed and what's actually in 
the string.

I think I understand it all now :)

Thanks.



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:54:45 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:54:45 -0000
Subject: Python AppStore / Marketplace
In-Reply-To: <gnv6vs$bm7$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org> <49A311C3.80707@gmail.com>
	<gnv6vs$bm7$1@ger.gmane.org>
Message-ID: <op.uptzhjvya8ncjz@gnudebst>

On Mon, 23 Feb 2009 22:12:09 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Michael Torrie wrote:
>> Steve Holden wrote:
>>> Unfortunately I have no idea what a "souq" is, so I suspect this may be
>>> linguistically biased against English speakers. Or perhaps I'm just
>>> ignorant.
>>
>> Nah.  Not biased against English speakers.  Just biased against the
>> un-traveled.  :)
>
> Don't think so. I've visited roughly twenty-five difference countries
> and traveled I-don't-know-how-many miles, but certainly over a million.
> Unless you'd like to redefine "un-traveled" ... ?
>
> But I do (still) speak English (of a kind).

A souq is a bazaar :-)

Well, close enough anyway.  It's another arabic word that translates as
"market" in both the mercantile and financial senses, I believe.  Maybe
I've just read too much arabic-themed fiction, but I was surprised not
to find the word in my trusty Chambers.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:55:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:55:16 -0200
Subject: getting at individual bits inside byte field: struct module :
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <op.uptziemfx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:18:31 -0200, harijay <harijay at gmail.com> escribi?:

> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
>
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
>
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
>
> I am reading in the two bytes using the following code
>
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
>
> Now element1 has type "str" .

No, should be type 'int', that's what the H format means.

> How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .

Try again - it should work. Perhaps you used the wrong variable name?  
instead of the resultant from struct.unpack

py> import struct
py> element1_format = struct.Struct("<H")
py> (element1,) = element1_format.unpack('AB')
py> element1
16961
py> element1 & 0x007F
65
py> chr(65)
'A'

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:56:36 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:56:36 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnvg1a$g7g$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
Message-ID: <op.uptzkmc1a8ncjz@gnudebst>

On Tue, 24 Feb 2009 00:46:34 -0000, bvdp <bob at mellowood.ca> wrote:

> Just because I never really thought too much about it :) I'm doing my  
> work on a linux box and my user is on windows ... and he's used to using  
> '\' ... but, you are absolutely right! Just use '/' on both systems and  
> be done with it. Of course I still need to use \x20 for spaces, but that  
> is easy.

Erm, no.  "\x20" is exactly the same as " " in a string literal.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jjposner at snet.net  Mon Feb 23 19:58:44 2009
From: jjposner at snet.net (John Posner)
Date: Mon, 23 Feb 2009 16:58:44 -0800 (PST)
Subject: Peculiar swap behavior
Message-ID: <480179.92204.qm@web83107.mail.mud.yahoo.com>

>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n,m

I believe this is an RTFM situation. In the Python 2.6.1 help topic "Simple Statements" > "Assignment Statements", see this para:
<snip>
If the target is a slicing: The primary expression in the reference is evaluated. It should yield a mutable sequence object (such as a list). The assigned object should be a sequence object of the same type. Next, the lower and upper bound expressions are evaluated, insofar they are present; defaults are zero and the sequence?s length. The bounds should evaluate to (small) integers. If either bound is negative, the sequence?s length is added to it. The resulting bounds are clipped to lie between zero and the sequence?s length, inclusive. Finally, the sequence object is asked to replace the slice with the items of the assigned sequence. The length of the slice may be different from the length of the assigned sequence, thus changing the length of the target sequence, if the object allows it.
</snip>
The crucial sentence is:
     Finally, the sequence object is asked to replace the slice with the items
     of the assigned sequence.
In our example, this means that the assignment of the 3-item slicing
    m[:] = n
... has this result:
 * the identifier m[0] now refers to the same object as the identifier n[0]
 * the identifier m[1] now refers to the same object as the identifier n[1]
 * the identifier m[2] now refers to the same object as the identifier n[2]
Although m and n are still different list objects, all of the "slots" in both lists now contain the same (sub)objects.
I've verified the above analysis to my own satisfaction using IDLE 2.6.1:
---------
def list_ids(mylist):
    return id(mylist), map(id, mylist)
    
m,n = [1,2,3],[4,5,6]
print m,n

print "m:", list_ids(m)
print "n:", list_ids(n)

m[:], n[:] = n, m
print m,n

print "m:", list_ids(m)
print "n:", list_ids(n)
---------

output:

[1, 2, 3] [4, 5, 6]
m: (4589728, [10970688, 10970676, 10970664])
n: (11311344, [10970652, 10970640, 10970628])
[4, 5, 6] [4, 5, 6]
m: (4589728, [10970652, 10970640, 10970628])
n: (11311344, [10970652, 10970640, 10970628])


-John
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From mwilson at the-wire.com  Mon Feb 23 20:03:28 2009
From: mwilson at the-wire.com (Mel)
Date: Mon, 23 Feb 2009 20:03:28 -0500
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <gnvh0m$15m9$1@services.telesweet.net>

bvdp wrote:
> Not sure if it's more clear or not :)
> 
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
>  >>> print a
> c:\Program Files\test
> 
> Which is all fine. And I didn't need to use decode().
> 
> So, in this case I'm assuming that the interpreter is converting the
> escapes on assignment. And, in this case the string has single \s in it.

Strictly speaking, the compiler is converting the escapes when it uses the
literal to create a string value.

        Mel.



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:14:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:14:42 -0200
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
Message-ID: <op.upt0esahx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:

> Chris Rebert wrote:
>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
>> [problem with Python and Windows paths using backslashes]
>>  Is there any particular reason you can't just internally use regular
>> forward-slashes for the paths? They work in Windows from Python in
>> nearly all cases and you can easily interconvert using os.pathsep if
>> you want the path to be pretty when you show it to (or get it from)
>> the user or whatever.
>
> Just because I never really thought too much about it :) I'm doing my  
> work on a linux box and my user is on windows ... and he's used to using  
> '\' ... but, you are absolutely right! Just use '/' on both systems and  
> be done with it. Of course I still need to use \x20 for spaces, but that  
> is easy.

Why is that? "\x20" is exactly the same as " ". It's not like %20 in URLs,  
that becomes a space only after decoding.

py> '\x20' == ' '
True
py> '\x20' is ' '
True

(ok, the last line might show False, but being True means that both are  
the very same object)

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 20:29:17 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 01:29:17 -0000
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
In-Reply-To: <E306DE3F7B904BF094575153877180B6@Woodygar>
References: <E306DE3F7B904BF094575153877180B6@Woodygar>
Message-ID: <op.upt023w3a8ncjz@gnudebst>

On Mon, 23 Feb 2009 23:33:31 -0000, Gary Wood <woodygar at sky.com> wrote:

> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     for i in items:
>        return (''.join(items))

As I'm sure your teacher will point out, this is sub-optimal :-)
That for-loop isn't doing anything, because you always return
out of it at the first iteration.

I suspect that you're expected to concatenate the strings
together by hand and return the resulting string once you've
done them all.  Trying writing it that way.

PS: it helps a lot if what you say in the doc string matches
what you write in the rest of the code.  In this case you
call your input string "items", but then say "Join all the
strings in *stringList*..."

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From bob at mellowood.ca  Mon Feb 23 20:31:20 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 18:31:20 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.618.1235438099.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>	<mailman.614.1235436113.11746.python-list@python.org>	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
Message-ID: <gnvila$fne$1@news.motzarella.org>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
> 
>> Chris Rebert wrote:
>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
>>> [problem with Python and Windows paths using backslashes]
>>>  Is there any particular reason you can't just internally use regular
>>> forward-slashes for the paths? They work in Windows from Python in
>>> nearly all cases and you can easily interconvert using os.pathsep if
>>> you want the path to be pretty when you show it to (or get it from)
>>> the user or whatever.
>>
>> Just because I never really thought too much about it :) I'm doing my 
>> work on a linux box and my user is on windows ... and he's used to 
>> using '\' ... but, you are absolutely right! Just use '/' on both 
>> systems and be done with it. Of course I still need to use \x20 for 
>> spaces, but that is easy.
> 
> Why is that? "\x20" is exactly the same as " ". It's not like %20 in 
> URLs, that becomes a space only after decoding.
> 
> py> '\x20' == ' '
> True
> py> '\x20' is ' '
> True
> 
> (ok, the last line might show False, but being True means that both are 
> the very same object)
> 

I need to use the \x20 because of my parser. I'm reading unquoted lines 
from a file. The file creater needs to use the form "foo\x20bar" without 
the quotes in the file so my parser can read it as a single token. 
Later, the string/token needs to be decoded with the \x20 converted to a 
space.

So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar" 
is one.

So, it's not really a problem of what happens when you assign a string 
in the form "foo bar", rather how to convert the \x20 in a string to a 
space. I think the \\ just complicates the entire issue.


From rdmurray at bitdance.com  Mon Feb 23 20:40:59 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 24 Feb 2009 01:40:59 +0000 (UTC)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<9afda87e04d99d252c989c08ade7699f.squirrel@acooke.dyndns.org>
Message-ID: <gnvj7a$83k$1@ger.gmane.org>

"andrew cooke" <andrew at acooke.org> wrote:
> rdmurray at bitdance.com wrote:
> [...]
> > (You know, I really ought to revisit that routine and make it part
> > of my standard development toolbox.)
> 
> please post it....

OK.  I dug it up, cut out the stuff that was specific to the application,
freshened it up a little, and added a little demo.  I don't claim this
is the best possible way to do this (it certainly could be made smarter,
possibly by using python facilities to actually parse the line; right
now it takes a very brute force approach to trying to find variables),
but it served my purposes and perhaps it will help others.

Oh, yeah, and I just added the globals bit without thoroughly testing
it...I think it probably doesn't help much and may be misleading when
the traceback is thrown in an imported module.

Enjoy.

--RDM

------------------------------------------------------------------
from traceback import format_tb, format_exception_only
from sys import exc_info
from re import compile
varsplitter = compile("[^0-9a-zA-Z_]")

def format_exception():
    """
    Add a dump of any variables we can identify from the failing program
    line to the end of the traceback.  The deep mojo for doing this came
    from an example in the Zope core plus documentation in the Python
    Quick Reference.
    """
    etype, value, tb = exc_info()
    plaintb = format_tb(tb)
    result=['Traceback (innermost last):']
    for line in plaintb:
        result.append(line)
        f = tb.tb_frame
        tb = tb.tb_next
    locals=f.f_locals
    vars = varsplitter.split(line.split('\n')[-2])
    dvars = set()
    self = None
    if 'self' in locals: self = locals['self']
    for v in vars:
        if v in dvars: continue
        dvars.add(v)
        if v in locals:
            result.append('      %s: %r\n' % (v,locals[v]))
        if self and hasattr(self, v):
            result.append('      self.%s: %r\n' % (v,getattr(self, v)))
        if v in globals():
            result.append('      (global) %s: %r\n' % (v,globals()[v]))
    result.extend(format_exception_only(etype, value))
    return ''.join(result)


class Demo:
    y = 200
    def __init__(self, x):
        self.x = x

    def bad(self):
        x = [1, 2]
        y = (5, 9, 9)
        y[1] = x[2] + foo

foo = 'a value'

def main():
    bar = Demo('some value')
    bar.bad()

  
if __name__=='__main__':
    try: main()
    except Exception:
        print format_exception()

------------------------------------------------------------------
rdmurray at maestro:~>python tb.py
Traceback (innermost last):  File "tb.py", line 56, in <module>
    try: main()
  File "tb.py", line 52, in main
    bar.bad()
  File "tb.py", line 46, in bad
    y[1] = x[2] + foo
      y: (5, 9, 9)
      self.y: 200
      x: [1, 2]
      self.x: 'some value'
      (global) foo: 'a value'
IndexError: list index out of range
------------------------------------------------------------------



From mcrute at gmail.com  Mon Feb 23 20:41:59 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 20:41:59 -0500
Subject: Code in __init__.py, is it bad form?
Message-ID: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>

Is it bad form (i.e. non-pythonic) to have code in your __init__.py
files? I know this is subjective so I'm just looking for the general
consensus. I've heard both sides of the story and I personally feel
its okay if the code pertains to the whole module but have an open
mind about the matter. If you object to code in __init__.py why, and
what alternatives do you propose?

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:47:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:47:43 -0200
Subject: Need to store dictionary in file
References: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
Message-ID: <op.upt1xtdjx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 18:38:56 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>  
escribi?:

> I have a dictionary in which each key is associated with a list as value.
>
> eg: *dic={'a':['aa','ant','all']}*
>
> The dictionary contains *1.5 lakh keys*.
> Now i want to store it to a file,and need to be loaded to python program
> during execution.
> I expect your ideas/suggestions.
>
> Note:I think cPickle,bsddb can be used for this purpose,but i want to  
> know
> the best solution which runs *faster*.

Just try and see. You have to measure performance in your own specific use  
case. What is best for others may not be the best for you; for example,  
your dictionary appears to contain only strings, and this may affect  
performance.

I would try:

cPickle with protocol=-1
a cPickle.Pickler object with protocol=-1 , also setting fast=1 in the  
instance
the csv module
a SQL database, like sqlite
bsddb
a custom format, perhaps one word per line + blank line as separator.

But I would reconsider if having the whole dictionary in memory all the  
time is a good idea. Databases are good for storing and retrieving  
key->values.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:54:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:54:18 -0200
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
	<gnvila$fne$1@news.motzarella.org>
Message-ID: <op.upt18svjx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <bob at mellowood.ca> escribi?:
> Gabriel Genellina wrote:
>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
>>> Chris Rebert wrote:
>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:

>>>> [problem with Python and Windows paths using backslashes]
>>>>  Is there any particular reason you can't just internally use regular
>>>> forward-slashes for the paths? [...]
>>>
>>> you are absolutely right! Just use '/' on both systems and be done  
>>> with it. Of course I still need to use \x20 for spaces, but that is  
>>> easy.
>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in  
>> URLs, that becomes a space only after decoding.
>
> I need to use the \x20 because of my parser. I'm reading unquoted lines  
> from a file. The file creater needs to use the form "foo\x20bar" without  
> the quotes in the file so my parser can read it as a single token.  
> Later, the string/token needs to be decoded with the \x20 converted to a  
> space.
>
> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"  
> is one.
>
> So, it's not really a problem of what happens when you assign a string  
> in the form "foo bar", rather how to convert the \x20 in a string to a  
> space. I think the \\ just complicates the entire issue.

Just thinking, if you was reading the string from a file, why were you  
worried about \\ and \ in the first place? (Ok, you moved to use / so this  
is moot now).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 21:02:04 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 00:02:04 -0200
Subject: Peculiar swap behavior
References: <480179.92204.qm@web83107.mail.mud.yahoo.com>
Message-ID: <op.upt2lqalx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:58:44 -0200, John Posner <jjposner at snet.net>  
escribi?:

>>>      m,n = [1,2,3],[4,5,6]
>>>      m[:],n[:] = n,m
>
> I believe this is an RTFM situation. In the Python 2.6.1 help topic  
> "Simple Statements" > "Assignment Statements", see this para:

Yes, the other relevant paragraph is:

"""An assignment statement evaluates the expression list (remember that  
this can be a single expression or a comma-separated list, the latter  
yielding a tuple) and assigns the single resulting object to each of the  
target lists, from left to right."""

Note that the RHS is evaluated COMPLETELY before assignment to the LHS  
begins. The assignment:

a, b = c, d

is NOT equivalent to:

a = c
b = d

except in simple cases.

-- 
Gabriel Genellina



From steve at holdenweb.com  Mon Feb 23 21:03:18 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 21:03:18 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
Message-ID: <gnvkh9$iqb$1@ger.gmane.org>

Michael Crute wrote:
> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files? I know this is subjective so I'm just looking for the general
> consensus. I've heard both sides of the story and I personally feel
> its okay if the code pertains to the whole module but have an open
> mind about the matter. If you object to code in __init__.py why, and
> what alternatives do you propose?
> 
No, it's absolutely fine. One common usage is to import symbols from
sub-modules so that they are available from a simple import of the package.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From greg.ewing at canterbury.ac.nz  Mon Feb 23 21:06:18 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 24 Feb 2009 15:06:18 +1300
Subject: ANN: SuPy 1.6
Message-ID: <mailman.637.1235457234.11746.python-announce-list@python.org>

SuPy 1.6 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Fixed some bugs in the Tool and Observer classes, and
in the linetool example.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From bob at mellowood.ca  Mon Feb 23 21:18:28 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 19:18:28 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.623.1235440480.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>	<mailman.614.1235436113.11746.python-list@python.org>	<gnvg1a$g7g$1@news.motzarella.org>	<mailman.618.1235438099.11746.python-list@python.org>	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org>
Message-ID: <gnvldk$827$1@news.motzarella.org>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <bob at mellowood.ca> escribi?:
>> Gabriel Genellina wrote:
>>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
>>>> Chris Rebert wrote:
>>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
> 
>>>>> [problem with Python and Windows paths using backslashes]
>>>>>  Is there any particular reason you can't just internally use regular
>>>>> forward-slashes for the paths? [...]
>>>>
>>>> you are absolutely right! Just use '/' on both systems and be done 
>>>> with it. Of course I still need to use \x20 for spaces, but that is 
>>>> easy.
>>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in 
>>> URLs, that becomes a space only after decoding.
>>
>> I need to use the \x20 because of my parser. I'm reading unquoted 
>> lines from a file. The file creater needs to use the form "foo\x20bar" 
>> without the quotes in the file so my parser can read it as a single 
>> token. Later, the string/token needs to be decoded with the \x20 
>> converted to a space.
>>
>> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar" 
>> is one.
>>
>> So, it's not really a problem of what happens when you assign a string 
>> in the form "foo bar", rather how to convert the \x20 in a string to a 
>> space. I think the \\ just complicates the entire issue.
> 
> Just thinking, if you was reading the string from a file, why were you 
> worried about \\ and \ in the first place? (Ok, you moved to use / so 
> this is moot now).
> 

Just cruft introduced while I was trying to figure it all out. Having to 
figure the \\ and \x20 at same time with file and keyboard input just 
confused the entire issue :) Having the user set a line like 
c:\\Program\x20File ... works just fine. I'll suggest he use 
c:/program\x20files to make it bit simple for HIM, not my parser. 
Unfortunately, due to some bad design decisions on my part about 5 years 
ago I'm afraid I'm stuck with the \x20.

Thanks.



From mcrute at gmail.com  Mon Feb 23 21:21:57 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 21:21:57 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <gnvkh9$iqb$1@ger.gmane.org>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
Message-ID: <558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve at holdenweb.com> wrote:
> Michael Crute wrote:
>> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
>> files? I know this is subjective so I'm just looking for the general
>> consensus. I've heard both sides of the story and I personally feel
>> its okay if the code pertains to the whole module but have an open
>> mind about the matter. If you object to code in __init__.py why, and
>> what alternatives do you propose?
>>
> No, it's absolutely fine. One common usage is to import symbols from
> sub-modules so that they are available from a simple import of the package.

Yeah, I use it often for that I'm talking more about stuff like
utility functions, main methods, etc...

-mike

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From cs at zip.com.au  Mon Feb 23 21:30:11 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 24 Feb 2009 13:30:11 +1100
Subject: ZSI / MTOM
In-Reply-To: <1fd305a1-d087-4902-83ba-780e97bd042f@m24g2000vbp.googlegroups.com>
Message-ID: <20090224023011.GA31951@cskk.homeip.net>

On 23Feb2009 08:09, John Ionides <john.ionides at gmail.com> wrote:
| I have project for which I would like to have a python web service
| including MTOM. It seems that ZSI is the most complete python web
| service library but that it doesn't currently support MTOM - and
| having worked through the code it looks as though it isn't going to be
| exactly simple. Is there anyone working on a patch (or interested in
| collaborating if it comes down to writing one)?

Maybe you should ask on the pywebsvcs mailing list, where ZSI discussion
takes place?

  http://pywebsvcs.sourceforge.net/

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Software engineering? That's like military intelligence, isn't it?
        - Doug Mohney <sysmgr at king.eng.umd.edu>


From benjamin at python.org  Mon Feb 23 21:41:33 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 24 Feb 2009 02:41:33 +0000 (UTC)
Subject: Code in =?utf-8?b?X19pbml0X18ucHks?= is it bad form?
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
	<558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>
Message-ID: <loom.20090224T024009-863@post.gmane.org>

Michael Crute <mcrute <at> gmail.com> writes:
> On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve <at> holdenweb.com> wrote:
> > No, it's absolutely fine. One common usage is to import symbols from
> > sub-modules so that they are available from a simple import of the package.
> 
> Yeah, I use it often for that I'm talking more about stuff like
> utility functions, main methods, etc...

There's no overarching Python doctrine forbidding you to do it. It has simply
become a matter of taste. Personally, I tend to put utility functions in their
own module (eg. util), but I do use __init__ for main methods and such.






From bignose+hates-spam at benfinney.id.au  Mon Feb 23 21:43:06 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 24 Feb 2009 13:43:06 +1100
Subject: Code in __init__.py, is it bad form?
References: <mailman.621.1235439725.11746.python-list@python.org>
Message-ID: <873ae4imh1.fsf@benfinney.id.au>

Michael Crute <mcrute at gmail.com> writes:

> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files?

No, it's good form, but *only* for code that truly pertains to the
entire package. Anything that can reasonably be in a module other than
?__init__?, should be.

That leaves the following things suitable for code in ?__init__?,
OTTOMH:

* Metadata attributes for the package (e.g. version string).

* Docstring for the package

* ?from foo import bar? to present attributes of the package that are
  actually implemented in a module, which should be just about
  everything in the package.

> If you object to code in __init__.py why

I object only to code that isn't clearly ?relates to the entire
package and can't reasonably be implemented in a separate module?.

If you're going to the effort of making a package (rather than just
coding the namespace as a single module), then the implementation
should be in modules other than ?__init__? to allow easier re-use,
re-factoring, and testing.

-- 
 \      ?When I wake up in the morning, I just can't get started until |
  `\     I've had that first, piping hot pot of coffee. Oh, I've tried |
_o__)                                    other enemas...? ?Emo Philips |
Ben Finney


From wuwei23 at gmail.com  Mon Feb 23 21:43:15 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 23 Feb 2009 18:43:15 -0800 (PST)
Subject: Code in __init__.py, is it bad form?
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com> 
	<gnvkh9$iqb$1@ger.gmane.org>
	<mailman.626.1235442122.11746.python-list@python.org>
Message-ID: <8988a1ae-4741-4484-aa96-b00386ca58b7@v38g2000yqb.googlegroups.com>

On Feb 24, 12:21?pm, Michael Crute <mcr... at gmail.com> wrote:
> Yeah, I use it often for that I'm talking more about stuff like
> utility functions, main methods, etc...

Personally, I use it only for those tasks related to 'initialising'
the package, a la the importing of various modules for convenience
sake (as mentioned by Steve).

I don't expect a class to define its method within its __init__, so
I'd find it unusual for a package to be defining any kind of
functionality within its __init__.py. I wouldn't _not_ use your code,
but I might eye it warily... :)


From mcrute at gmail.com  Mon Feb 23 21:48:36 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 21:48:36 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <loom.20090224T024009-863@post.gmane.org>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
	<558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>
	<loom.20090224T024009-863@post.gmane.org>
Message-ID: <558b73fb0902231848w21810aaau45b950c99efd265b@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:41 PM, Benjamin Peterson <benjamin at python.org> wrote:
> Michael Crute <mcrute <at> gmail.com> writes:
>> On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve <at> holdenweb.com> wrote:
>> > No, it's absolutely fine. One common usage is to import symbols from
>> > sub-modules so that they are available from a simple import of the package.
>>
>> Yeah, I use it often for that I'm talking more about stuff like
>> utility functions, main methods, etc...
>
> There's no overarching Python doctrine forbidding you to do it. It has simply
> become a matter of taste. Personally, I tend to put utility functions in their
> own module (eg. util), but I do use __init__ for main methods and such.

Okay, so assuming I have decent judgment it sounds like I'm not doing
anything patently wrong. Thanks for the input.

-mike

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From ccormie at aussiemail.com.au  Mon Feb 23 21:49:41 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 13:49:41 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.577.1235425832.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
Message-ID: <01b355ab$0$20654$c3e8da3@news.astraweb.com>

Mark Hammond wrote:
> On 23/02/2009 11:41 PM, Chris Cormie wrote:
>>
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
> 
> LOL sounds right!
> 
>> How do you get *Python* to tell you the dll and the problem symbol? Not
>> external tools, Python. Python at a low level is calling LoadLibrary and
>> GetProcAddress to resolve symbols and the call fails.
> 
> It is the LoadLibrary that is failing; it should be obvious that if it 
> was a simple GetProcAddress that was failing, Python would simply throw 
> an exception rather than displaying the ugly dialog box you see.

I'm talking about the whole class of errors when loading an extension, 
the LoadLibary succeeds but the GetProcAddress fails. Not one specific 
error, a class of errors and *by definition* from the original question 
LoadLibrary succeeds. That's the point: at some point in this common 
scenario we have the path to the dll and a symbol we are resolving, and 
the symbol name, yet for whatever reason the GetProcAddress lookup 
fails, resulting in a surprisingly uninformative errors message.

Regards,
Chris.


From pavlovevidence at gmail.com  Mon Feb 23 22:16:54 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 23 Feb 2009 19:16:54 -0800 (PST)
Subject: Code in __init__.py, is it bad form?
References: <mailman.621.1235439725.11746.python-list@python.org>
Message-ID: <4a716d3b-91f2-48cc-a42d-b923ffb50835@j1g2000yqi.googlegroups.com>

On Feb 23, 5:41?pm, Michael Crute <mcr... at gmail.com> wrote:
> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files? I know this is subjective so I'm just looking for the general
> consensus. I've heard both sides of the story and I personally feel
> its okay if the code pertains to the whole module but have an open
> mind about the matter. If you object to code in __init__.py why, and
> what alternatives do you propose?


Well, I don't like when __init__ "helpfully" imports stuff I don't
need.  However, most single modules have lots of code I don't need,
too, and I never concern myself with them, so it's probably a
misplaced irk.

Go ahead and use it.


Carl Banks


From ccormie at aussiemail.com.au  Mon Feb 23 22:23:03 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:23:03 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.518.1235396997.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.518.1235396997.11746.python-list@python.org>
Message-ID: <01b35d7d$0$20654$c3e8da3@news.astraweb.com>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 10:41:20 -0200, Chris Cormie 
> <ccormie at aussiemail.com.au> escribi?:
> 
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
>> Your technique works well and it does provide the information and it 
>> is a (roundabout) solution to this class of problems:  thank you very 
>> much. It doesn't answer the original question so I'll restate it:
>>
>> How do you get *Python* to tell you the dll and the problem symbol? 
>> Not external tools, Python. Python at a low level is calling 
>> LoadLibrary and GetProcAddress to resolve symbols and the call fails. 
>> At that point it has the name of the dll and the problem symbol to 
>> hand and yet strangely only gives an opaque error message. How does 
>> one get Python to print out the faulty DLL and symbol?
> 
> You can't, because it isn't Python who's trying to load the symbol - the 
> *only* symbol that Python attempts to import itself is "initFOO" from 
> FOO.pyd, and when that fails you get an explicit message.
> The error you see must come from the extension itself, and propagates 
> into Python as an ImportError.

Right -- now we are getting somewhere! That makes a lot of sense.

What I was expecting to see next was an explicit GetProcAddress() call 
in the extension code that was failing in initFOO() or elsewhere in the 
extension code. But there are no such calls.

I think what might have been making this confusing is that the root of 
my example problem is link time.

Let me explain by giving the specific example case I have to hand.
I orginally got on to this class of opaque runtime errors caused by 
missing symbols through building the pycURL extension on MinGW. As of 
Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW 
maintains a set of .a files for system DLLs including the C Runtime. 
When building pycURL naturally I want to link against libmsvcr90.a so 
Python 2.6 and pycURL are using the same C Rutime. Problem was, MinGW's 
  .a was wrong: it exports symbols that msvcr90.dll does not in fact 
possess. Building pycURL with the faulty libmsvcr90.a causes the opaque 
error message: "ImportError: DLL load failed"

Now I expected this meant an explict LoadLibrary() GetProcAddress() 
sequence was failing in the extension but perhaps that's not what 
happens at all?
Chris






From ccormie at aussiemail.com.au  Mon Feb 23 22:25:40 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:25:40 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>
Message-ID: <01b35e19$0$20654$c3e8da3@news.astraweb.com>

John Machin wrote:
> On Feb 23, 11:41 pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>> LOL, I am that person :p
> 
> It wasn't apparent, and still isn't.

Yikes, enough with the rudeness people. I'm asking a reasonable question 
in a good faith.


From venutaurus539 at gmail.com  Mon Feb 23 22:29:07 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 19:29:07 -0800 (PST)
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
Message-ID: <1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>

On Feb 23, 11:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 23, 2009 at 5:51 AM, venutaurus... at gmail.com
>
> <venutaurus... at gmail.com> wrote:
> > Hi all,
> > ? ? ? ? ?I am trying to find the attributes of afile whose name has
> > non english characters one like given below. When I try to run my
> > python scirpt, it fails giving out an error filename must be in string
> > or UNICODE. When i try to copy the name of the file as a strinig, it
> > (KOMODO IDE) is not allowing me to save the script saying that it
> > cannot convert some of the characters in the current encoding which is
> > Western European(CP-1252).
>
> > 0010testUnicode_???????????????????? !#$%&'()+,-.
> > 0123456789;=... at ABCD.txt.txt
>
> (1) How are you entering or retrieving that filename?
> (2) Please provide the exact error and Traceback you're getting.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

Hello,
        First of all thanks for your response. I've written a function
as shown below to recurse a directory and return a file based on the
value of n. I am calling this fucntion from my main code to catch that
filename. The folder which it recurses through contains a folder
having files with unicode names (as an example i've given earlier.
-----------------------------------------------------------------------------
def findFile(dir_path):
    for name in os.listdir(dir_path):
        full_path = os.path.join(dir_path, name)
        print full_path
        if os.path.isdir(full_path):
            findFile(full_path)
        else:
            n = n - 1
            if(n ==0):
                return full_path
--------------------------------------------------------------------------------------------------
                    The problem is in the return statement. In the
function when I tried to print the file name, it is printing properly
but the receiving variable is not getting populated with the file
name. The below code (1st statement) shows the value of the full_path
variable while the control is at the return statement. The second
statement is in the main code from where the function call has been
made.
Once the control has reached the main procedure after executing the
findFile procedure, the third statement gives the status of file
variable which has type as NoneType and value as None. Now when I try
to check if the path exists, it fails giving the below trace back.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder
\0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
file = findFile(fpath)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
file
NoneType
None

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
This is the final trace back:

Traceback (most recent call last):
  File "C:\RecallStubFopen.py", line 268, in <module>
    if os.path.exists(file):
  File "C:\Python26\lib\genericpath.py", line 18, in exists
    st = os.stat(path)
TypeError: coercing to Unicode: need string or buffer, NoneType found

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Please ask if you need any further information.


Thank you,
Venu



From johnforse at talktalk.net  Mon Feb 23 22:31:56 2009
From: johnforse at talktalk.net (John Forse)
Date: Tue, 24 Feb 2009 03:31:56 +0000
Subject: getting tut. example to work
Message-ID: <45818CC4-B629-4995-9C52-150297BBE7E5@talktalk.net>

I'm trying some examples from the language ref sections on the site in  
the process of learning some python in 3.0.1. I've tried to run both  
of the samples below ,but the only printout is "generator object chain  
at 0x11f4dc8" whether I use print() or not . How do I use the sample  
to produce the expected printout a b c d e f.
  Thanks
John F
A
def chain(*iterables):
     for it in iterables:
         for element in it:
             print(element)
             yield element

def main():
     chain('abc','def')

main()
B
alternative
import itertools
itertools.chain('abc','def')





From ccormie at aussiemail.com.au  Mon Feb 23 22:54:15 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:54:15 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.577.1235425832.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
Message-ID: <01b364cd$0$5185$c3e8da3@news.astraweb.com>

Mark Hammond wrote:
> On 23/02/2009 11:41 PM, Chris Cormie wrote:
>>
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
> 
> LOL sounds right!
> 
>> How do you get *Python* to tell you the dll and the problem symbol? Not
>> external tools, Python. Python at a low level is calling LoadLibrary and
>> GetProcAddress to resolve symbols and the call fails.
> 
> It is the LoadLibrary that is failing; it should be obvious that if it 
> was a simple GetProcAddress that was failing, Python would simply throw 
> an exception rather than displaying the ugly dialog box you see.
> 
> The problem is that some *other* DLL in the chain of dependencies is 
> failing to load; please re-adjust your perceptions of your own knowledge 
> and re-read John's initial response - if you follow his instructions 
> that should all become quite obvious.
> 
> Mark

I think an example would help rather than me jabbering on about 
LoadLibary/GetProcAddress .

It really is a case of Python loads module x depending on DLL y that is 
missing symbol z, yet the error message is just "load x failed" when in 
theory it could be "load x failed: y doesn't have z".

However I think I am confusing people (and myself!) by assuming it's 
always as explicit as a LoadLibary/GetProcAddress sequence that is 
failing when people see this error.

Let me explain by giving the specific example case I have to hand.
I originally got on to this class of opaque runtime errors caused by 
missing symbols through building the pycURL extension on MinGW. As of 
Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW 
maintains a set of .a files for system DLLs including the C Runtime. 
When building pycURL naturally I want to link against libmsvcr90.a so 
Python 2.6 and pycURL are using the same C Runtime. Problem was, MinGW's 
  .a was wrong: it exports symbols that msvcr90.dll does not in fact 
possess. Building pycURL with the faulty libmsvcr90.a causes the opaque 
error message: "ImportError: DLL load failed"

I think Gabriel's got the part of the answer: she said  "it isn't Python 
who's trying to load the symbol - the *only* symbol that Python attempts 
to import itself is "initFOO" from FOO.pyd"

So my next question is: given the above missing-symbol problem, is the 
system able/willing to report the bad symbol reference in the .pyd when 
Python attempts to import initFOO?

Regards,
Chris.



From wuwei23 at gmail.com  Mon Feb 23 23:07:53 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 23 Feb 2009 20:07:53 -0800 (PST)
Subject: getting tut. example to work
References: <mailman.630.1235446326.11746.python-list@python.org>
Message-ID: <afd1c675-4e75-43cd-865b-f5457ab91eb2@j38g2000yqa.googlegroups.com>

On Feb 24, 1:31?pm, John Forse <johnfo... at talktalk.net> wrote:
> I'm trying some examples from the language ref sections on the site in ?
> the process of learning some python in 3.0.1. I've tried to run both ?
> of the samples below ,but the only printout is "generator object chain ?
> at 0x11f4dc8" whether I use print() or not .

Yes, because you're creating a generator object but you're not
actually doing anything with it.

> How do I use the sample ?
> to produce the expected printout a b c d e f.

Since you have a print inside 'chain', you should be able to get that
output by doing the following:

    list(chain('abc','def'))

Although I'd recommend removing the print from 'chain' and doing this
instead:

    for elem in chain('abc','def'):
        print elem


From venutaurus539 at gmail.com  Mon Feb 23 23:20:30 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 20:20:30 -0800 (PST)
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
	<1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>
Message-ID: <0a4fa610-ac99-41e1-9fab-06b461c71a4a@r34g2000vbp.googlegroups.com>

On Feb 24, 8:29?am, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 23, 11:02?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Mon, Feb 23, 2009 at 5:51 AM, venutaurus... at gmail.com
>
> > <venutaurus... at gmail.com> wrote:
> > > Hi all,
> > > ? ? ? ? ?I am trying to find the attributes of afile whose name has
> > > non english characters one like given below. When I try to run my
> > > python scirpt, it fails giving out an error filename must be in string
> > > or UNICODE. When i try to copy the name of the file as a strinig, it
> > > (KOMODO IDE) is not allowing me to save the script saying that it
> > > cannot convert some of the characters in the current encoding which is
> > > Western European(CP-1252).
>
> > > 0010testUnicode_???????????????????? !#$%&'()+,-.
> > > 0123456789;=... at ABCD.txt.txt
>
> > (1) How are you entering or retrieving that filename?
> > (2) Please provide the exact error and Traceback you're getting.
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> Hello,
> ? ? ? ? First of all thanks for your response. I've written a function
> as shown below to recurse a directory and return a file based on the
> value of n. I am calling this fucntion from my main code to catch that
> filename. The folder which it recurses through contains a folder
> having files with unicode names (as an example i've given earlier.
> --------------------------------------------------------------------------- --
> def findFile(dir_path):
> ? ? for name in os.listdir(dir_path):
> ? ? ? ? full_path = os.path.join(dir_path, name)
> ? ? ? ? print full_path
> ? ? ? ? if os.path.isdir(full_path):
> ? ? ? ? ? ? findFile(full_path)
> ? ? ? ? else:
> ? ? ? ? ? ? n = n - 1
> ? ? ? ? ? ? if(n ==0):
> ? ? ? ? ? ? ? ? return full_path
> --------------------------------------------------------------------------- -----------------------
> ? ? ? ? ? ? ? ? ? ? The problem is in the return statement. In the
> function when I tried to print the file name, it is printing properly
> but the receiving variable is not getting populated with the file
> name. The below code (1st statement) shows the value of the full_path
> variable while the control is at the return statement. The second
> statement is in the main code from where the function call has been
> made.
> Once the control has reached the main procedure after executing the
> findFile procedure, the third statement gives the status of file
> variable which has type as NoneType and value as None. Now when I try
> to check if the path exists, it fails giving the below trace back.
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ----------------------------
> E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder
> \0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ------------------
> file = findFile(fpath)
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- -----------------------------------------
> file
> NoneType
> None
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- -----------------------------------------
> This is the final trace back:
>
> Traceback (most recent call last):
> ? File "C:\RecallStubFopen.py", line 268, in <module>
> ? ? if os.path.exists(file):
> ? File "C:\Python26\lib\genericpath.py", line 18, in exists
> ? ? st = os.stat(path)
> TypeError: coercing to Unicode: need string or buffer, NoneType found
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ---------------------------------------------
>
> Please ask if you need any further information.
>
> Thank you,
> Venu

To add to what I've said above...I tried manual conversion of the file
using unicode() function which is throwing this error:
Traceback (most recent call last):
  File "C:\RecallStubFopen.py", line 278, in <module>
    file = unicode(file)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xeb in position
74: ordinal not in range(128)








From nagle at animats.com  Mon Feb 23 23:21:59 2009
From: nagle at animats.com (John Nagle)
Date: Mon, 23 Feb 2009 20:21:59 -0800
Subject: "Byte" type?
In-Reply-To: <49A19B92.2080102@v.loewis.de>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
Message-ID: <49a36e1c$0$1586$742ec2ed@news.sonic.net>

Martin v. L?wis wrote:
>>> Please don't call something dumb that you don't fully understand. It's
>>> offenses the people who have spent lots of time developing Python --
>>> personal, unpaid and voluntary time!

    Some of the people involved are on Google's payroll.

>> Crying out;  "Please do not criticise me, I am doing it for free!" does
>> not justify delivering sub standard work - that is the nature of the
>> open source process - if you lift your head and say or do something,
>> there are bound to be some objections - some thoughtful and valid,
>> and others merely carping.  Being sensitive about it serves no purpose.
> 
> Still, John *clearly* doesn't understand what he observes, so asking him
> not to draw conclusions until he does understand is not defending
> against criticism.
> 
>> This is not a helpful response - on the surface JN has a point - If
>> you have to go through two conversions, then 2.6 does not achieve
>> what it appears to set out to do.  So the issue is simple:
>>
>> - do you have to convert twice?
> 
> Depends on how you write your code. If you use the bytearray type
> (which John didn't, despite his apparent believe that he did),
> then no conversion additional conversion is needed.

     According to PEP 3137, there should be no distinction between
the two for read purposes.  In 2.6, there is.  That's a bug.

> Likewise, if you only use byte (not bytearray) literals, without
> accessing individual bytes (e.g. if you only ever read and write
> them, or pass them to the struct module), 2to3 will do the right
> thing.
> 
>> - If yes - why? - as he says - there exists no prior code,
>>   so there seems to be no reason not to make it identical
>>   to 3.0
> 
> Sure there is. Making the bytes type and the str type identical
> in 2.x gives the easiest way of porting. Adding bytes as a separate
> type would have complicated a lot of things.
> 
> Regards,
> Martin

    No, it's broken.  PEP 3137 says one thing, and the 2.6 implementation
does something else.  So code written for 2.6 won't be ready for 3.0.
This defeats the supposed point of 2.6.

					John Nagle


From M8R-yfto6h at mailinator.com  Mon Feb 23 23:27:33 2009
From: M8R-yfto6h at mailinator.com (Mark Tolonen)
Date: Mon, 23 Feb 2009 20:27:33 -0800
Subject: getting at individual bits inside byte field: struct module :
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <gnvsut$gc5$1@aioe.org>


"harijay" <harijay at gmail.com> wrote in message 
news:4c7d58a1-830f-4f02-ba07-aa4910f5f4e9 at b16g2000yqb.googlegroups.com...
> In my last post I had asked about reading data from a binary file
> using the struct module.
> Thanks to some excellent help , I have managed to read in
> successfully
> most of the header of this binary format that I want to parse.  These
> are some time-voltage traces from a digital
> to analog converter for my experiments. The output is according to a
> format
> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
>
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
>
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
>
> I am reading in the two bytes using the following code
>
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
>
> Now element1 has type "str" . How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .
> How can I keep my string objects as bits and apply bitmasks to them
> Any help in this will be greatly appreciated.
> Thanks
> hari

Please post a small example that fails as you describe.  From your example, 
element1 should be an int (unpacked from two bytes), and there is no f 
defined.  Without the actual code we can't figure out what you are doing 
wrong.

This works as expected:

>>> import struct
>>> format = struct.Struct("<H")
>>> (element1,) = format.unpack('aa') # a two-byte string to unpack
>>> print hex(element1)
0x6161
>>> print element1 & 0x1f
1

-Mark



From comptekki at gmail.com  Mon Feb 23 23:35:38 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:35:38 -0700
Subject: how to conditionally add a dict in-line
Message-ID: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>

I have this line:

navs.append(A(' '+str(i+1)+'
',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query
or ''})))

How do I do something like this:

vars={'_page':i, if request.vars._query not None then insert this
key/value pair ('_query':request.vars._query) else insert nothing }

thx,

-wj


From comptekki at gmail.com  Mon Feb 23 23:44:37 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:44:37 -0700
Subject: how to conditionally add a dict in-line
In-Reply-To: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>
References: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>
Message-ID: <533df7fa0902232044o6babfc8fh415f0815f531351a@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:35 PM, Wes James <comptekki at gmail.com> wrote:
> I have this line:
>
> navs.append(A(' '+str(i+1)+'
> ',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query
> or ''})))
>
> How do I do something like this:
>
> vars={'_page':i, if request.vars._query not None then insert this
> key/value pair ('_query':request.vars._query) else insert nothing }


Nevermind, this seems to work:

                navs.append(A(' '+str(i+1)+'
',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query}
if request.vars._query else {'_page':i})))

-wj


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:47:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:47:23 GMT
Subject: how to conditionally add a dict in-line
References: <mailman.631.1235450141.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:35:38 -0700, Wes James wrote:

> I have this line:
> 
> navs.append(A(' '+str(i+1)+'
> ',_href=self.action(args=request.args,vars=
{'_page':i,'_query':request.vars._query
> or ''})))

What a mess. How can you read it?


> How do I do something like this:
> 
> vars={'_page':i, if request.vars._query not None then insert this
> key/value pair ('_query':request.vars._query) else insert nothing }

vars = {'_page': i}
if request.vars._query is not None:
    vars['_query'] = request.vars._query


See how simple and clear things are when you give up the insistence on 
making everything a one-liner?

But if you *insist* on a one-liner (perhaps because your keyboard has a 
broken Enter key):

vars = {'_page': i} if request.vars._query is None else  {'_page': i, '_query': request.vars._query}




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:47:59 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:47:59 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:

> Steven D'Aprano wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>>
>> Except that is wrong. If it were true, you could do this:
> [pointer swapping]
> 
> i was thinking of how the stack is used; i would have called what you
> are talking about "pointer semantics".  however, on reading around a
> little, it seems that i'm in a very small minority (which is a pity,
> because if you restrict the meaning to how values are handled on the
> stack then you get a lot closer to having just values and references,
> rather than the whole pile of different terms that are apparently in
> use).
> 
> sorry for the confusion,

Why is it a pity to have a whole pile of different terms to describe a 
whole lot of different behaviours? I would suggest the real confusion 
would be if we had two terms to describe a dozen different parameter-
passing conventions.




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:50:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:50:18 GMT
Subject: Access from class variable to one on constructor
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
	<mailman.509.1235383504.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.50.19@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 08:02:17 -0200, Gabriel Genellina wrote:

> En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.esp at googlemail.com>
> escribi?:
> 
>> How to access from a class variable to one that is initialized on the
>> constructor?
>> --------------
>> class Foo():
>>   foo = bar  # I want to access *from here* to variables created on
>> the constructor.
>>
>>   def __init__(self, bar_init):
>>     self.bar = bar_init
>> --------------
> 
> Unless I misunderstand you, you can't do that. Class variables are
> shared by all instances and don't depend on a particular instance - they
> exist even *before* any instance is created.


Please don't use the term "class variables" to mean class *attributes*, 
it makes my brain hurt. If a string variable is a string, and an int 
variable is an int, and a bool variable is a bool, a class variable 
should be a class.

What you can do is shift the creation of the class attribute to the 
constructor, instead of when the class is created:

class Spam():
    def __init__(self, bar_init):
        self.__class__.foo = bar_init



But I'm not sure why you would want to.



-- 
Steven


From peter at www.pjb.com.au  Mon Feb 23 23:56:12 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 24 Feb 2009 04:56:12 GMT
Subject: tkinter icons as bytestrings, not files?
Message-ID: <slrngq6vfd.2u7.peter@box8.pjb.com.au>

Greetings,

As a newbie, starting with Python3, I'm working my way through Mark
Summerfield's tkinter examples.  In the toolbar, there's lines like:
    for image, command in (
        ('images/filenew.gif',  self.fileNew),
        ('images/fileopen.gif', self.fileOpen),
        ('images/filesave.gif', self.fileSave),
        ('images/editadd.gif',  self.editAdd),
        ('images/editedit.gif', self.editEdit),
        ('images/editdelete.gif', self.editDelete),):
    image = os.path.join(os.path.dirname(__file__), image)
    image = tkinter.PhotoImage(file=image)
    self.toolbar_images.append(image)
    button = tkinter.Button(toolbar, image=image, command=command)
    button.grid(row=0, column=len(self.toolbar_images) -1)

which are always failing because the icons are in the wrong place
and I can't help but wonder if I can put all these little images
in the application itself, either as b'whatever' or uuencoded or
in svg etc, and then invoke some suitable variation of the
    image = tkinter.PhotoImage(file=image)
or of the
    button = tkinter.Button(toolbar, image=image, command=command)
command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
magic key (unless it's "data=something, format=something")) ...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From comptekki at gmail.com  Mon Feb 23 23:56:46 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:56:46 -0700
Subject: how to conditionally add a dict in-line
In-Reply-To: <pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
References: <mailman.631.1235450141.11746.python-list@python.org>
	<pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <533df7fa0902232056q6d65eeacg1536c586c66e1732@mail.gmail.com>

Steven. Thx

(see my question below...)

On Mon, Feb 23, 2009 at 9:47 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Mon, 23 Feb 2009 21:35:38 -0700, Wes James wrote:
>
>> I have this line:
>>
>> navs.append(A(' '+str(i+1)+'
>> ',_href=self.action(args=request.args,vars=
> {'_page':i,'_query':request.vars._query
>> or ''})))
>
> What a mess. How can you read it?
>
>
>> How do I do something like this:
>>
>> vars={'_page':i, if request.vars._query not None then insert this
>> key/value pair ('_query':request.vars._query) else insert nothing }
>
> vars = {'_page': i}
> if request.vars._query is not None:
> ? ?vars['_query'] = request.vars._query

Could this be:

vars = {'_page': i}
 if request.vars._query:
    vars['_query'] = request.vars._query



>
> See how simple and clear things are when you give up the insistence on
> making everything a one-liner?

<snip>

-wj


From sjmachin at lexicon.net  Tue Feb 24 00:01:28 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 23 Feb 2009 21:01:28 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org> 
	<01b364cd$0$5185$c3e8da3@news.astraweb.com>
Message-ID: <68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>

On Feb 24, 2:54?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> Mark Hammond wrote:
> > On 23/02/2009 11:41 PM, Chris Cormie wrote:
>
> >>> If that not-very-technical description [all I've ever needed] doesn't
> >>> help, you'll need to read the DW help file (HTFF1K) or wait till
> >>> someone who knows what they are doing comes along :-)
>
> >> LOL, I am that person :p
>
> > LOL sounds right!
>
> >> How do you get *Python* to tell you the dll and the problem symbol? Not
> >> external tools, Python. Python at a low level is calling LoadLibrary and
> >> GetProcAddress to resolve symbols and the call fails.
>
> > It is the LoadLibrary that is failing; it should be obvious that if it
> > was a simple GetProcAddress that was failing, Python would simply throw
> > an exception rather than displaying the ugly dialog box you see.
>
> > The problem is that some *other* DLL in the chain of dependencies is
> > failing to load; please re-adjust your perceptions of your own knowledge
> > and re-read John's initial response - if you follow his instructions
> > that should all become quite obvious.
>
> > Mark
>
> I think an example would help rather than me jabbering on about
> LoadLibary/GetProcAddress .
>
> It really is a case of Python loads module x depending on DLL y that is
> missing symbol z, yet the error message is just "load x failed" when in
> theory it could be "load x failed: y doesn't have z".
>
> However I think I am confusing people (and myself!) by assuming it's

Don't assume; read the [open] source code; see below.

> always as explicit as a LoadLibary/GetProcAddress sequence that is
> failing when people see this error.
>
> Let me explain by giving the specific example case I have to hand.
> I originally got on to this class of opaque runtime errors caused by
> missing symbols through building the pycURL extension on MinGW. As of
> Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW
> maintains a set of .a files for system DLLs including the C Runtime.
> When building pycURL naturally I want to link against libmsvcr90.a so
> Python 2.6 and pycURL are using the same C Runtime. Problem was, MinGW's
> ? .a was wrong: it exports symbols that msvcr90.dll does not in fact
> possess. Building pycURL with the faulty libmsvcr90.a causes the opaque
> error message: "ImportError: DLL load failed"
>
> I think Gabriel's got the part of the answer: she said ?"it isn't Python
> who's trying to load the symbol - the *only* symbol that Python attempts
> to import itself is "initFOO" from FOO.pyd"
>
> So my next question is: given the above missing-symbol problem, is the
> system able/willing to report the bad symbol reference in the .pyd when
> Python attempts to import initFOO?

My reading of the Python 2.6.1 version of dynload_win.c tells me that:

1. It uses LoadLibraryEx() to attempt to load the pyd given its full
pathname

2. If that fails, it gets the Windows error code using GetLastError()

3. It gets the Windows message text using FormatMessage()

4. It assembles the message as "DLL load failed: " plus the Windows
message text (less any trailing "\r\n").

Note that if the pyd load succeeds, it rummages in memory to find the
pythonxx.dll used by the pyd so that it can be checked for
consistency. Then and only then it uses GetProcAddress() to get the
address of the initFOO function.

Do you know a way of getting more info out of Windows than GetLastError
()?


From alwaseem307ster at yahoo.com  Tue Feb 24 00:04:21 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 21:04:21 -0800 (PST)
Subject: pysqlite smart search
In-Reply-To: <22157116.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com>
Message-ID: <22175924.post@talk.nabble.com>




klia wrote:
> 
>  Hey guys;
> 
> I am trying to develop a tiny program using python to search inside sqlite
> database with file extension is .db in which the program will ask users to
> enter their search query and base on that it will retrieve the results But
> 
> I need the program to have some smartness in search mechanism in which the
> program will guess that the user is looking for these key words in the
> database.
> 
> so far i came up with this but the search ain't smart, i have to write the
> full key word in order to retrieve specific information.
> 
> from pysqlite2 import dbapi2 as sqlite3
> 
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()
> 
> Any ideas and
> thanks in advance
> Reply
> 

Thank you guys, it worked perfectly
Solved
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22175924.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From aquil.abdullah at gmail.com  Tue Feb 24 00:13:12 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 21:13:12 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com> 
	<mailman.587.1235430309.11746.python-list@python.org>
Message-ID: <794a35cc-f530-43e7-97c5-87694f27b573@x9g2000yqk.googlegroups.com>

Hello All,
  It occurred to me that I might just want to try copying the
subprocess.py installed in a /usr/lib/python24 installation to the
directory where I place the scripts that I need to launch my
application...I know this was mentioned earlier.  Anyway, my
application worked under python 2.3 and later python versions as
well.  Here is what I did:

I renamed subprocess.py to subprocess23.py and then used the following
code:

try:
  import subprocess
except ImportError:
  import subprocess23 as subprocess

I chose this route because I took a deeper look at the code in the
subprocess module and I also realized that I would not be able to use
the popen2, because I would not be able to do things like os.setpgrp
for preexec_fn, with popen2.  In the end, if I wanted that type of
functionality I would have to use os.dup, fork, exec, which meant
reinventing the wheel.  I overcame the issue of dealing with msvcrt
and _subprocess under windows by requiring python24 or greater under
windows.

Regards,
Aquil


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 24 00:33:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 05:33:37 GMT
Subject: how to conditionally add a dict in-line
References: <mailman.631.1235450141.11746.python-list@python.org>
	<pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
	<mailman.633.1235451410.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.05.33.37@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:56:46 -0700, Wes James wrote:

>> vars = {'_page': i}
>> if request.vars._query is not None:
>> ? ?vars['_query'] = request.vars._query
> 
> Could this be:
> 
> vars = {'_page': i}
>  if request.vars._query:
>     vars['_query'] = request.vars._query


Instead of typing "request.vars._query" in all the examples, I'm going to 
abbreviate it as "x" instead.

"if x is not None" and "if x" are very different things. Consider the 
following examples:


>>> x = None
>>>
>>> if x is not None:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing
>>>
>>> if x:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing


So far so good. Both pieces of code do the right thing when x actually is 
None. But what happens if x is *not* None?


>>> x = ""  # The empty string is *not* None.
>>>
>>> if x is not None:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
action performed when x is not None
>>>
>>> if x:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing



That's clearly wrong, because we know that x isn't None, it is the empty 
string. The test "if x" does not test for the same thing as "if x is not 
None". "if x" tests the general truth value of any object, and many 
objects have a false truth value: None, empty string, 0, [], {} and many 
more.




-- 
Steven


From chaosmage at gmail.com  Tue Feb 24 00:35:21 2009
From: chaosmage at gmail.com (collin)
Date: Mon, 23 Feb 2009 21:35:21 -0800 (PST)
Subject: How do I count the distance between strings in a list?
Message-ID: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>

For example, if I were to have the code

randomlist = ["1", "2", "3", "4"]

And I want to count the distance between strings "1" and "4" which is
3, what command can I use to do this?


From harijay at gmail.com  Tue Feb 24 00:42:26 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 21:42:26 -0800 (PST)
Subject: getting at individual bits inside byte field: struct module : 
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
	<gnvsut$gc5$1@aioe.org>
Message-ID: <f2060df4-de99-435e-bbf7-a42988b9d622@z1g2000yqn.googlegroups.com>

Thanks Gabriel , MRAB and Mark

Instead of using the bitwise operator on the unpacked data I was
trying to do a bitwise operator directly after read. This was giving
the unsupported operand error

i.e

# version in my code - wrong
file.read(2) & 0x001f

Instead of

# version in my example and now in my working code
(element1,) = struct.unpack("<H",file.read(2) )
Tonethrufour = element1 & 0x1F

I only realized it after I read your replies and went back to my
actual  code which had the mistake .
Thanks a lot again.

Hari



Thanks for your help and hope I dont commit any more such stupid
mistakes

On Feb 23, 11:27?pm, "Mark Tolonen" <M8R-yft... at mailinator.com> wrote:
> "harijay" <hari... at gmail.com> wrote in message
>
> news:4c7d58a1-830f-4f02-ba07-aa4910f5f4e9 at b16g2000yqb.googlegroups.com...
>
>
>
> > In my last post I had asked about reading data from a binary file
> > using the struct module.
> > Thanks to some excellent help , I have managed to read in
> > successfully
> > most of the header of this binary format that I want to parse. ?These
> > are some time-voltage traces from a digital
> > to analog converter for my experiments. The output is according to a
> > format
> > mentioned here : (http://www.dataq.com/support/techinfo/ff.htm)
>
> > I have a question about how to bitmask a bunch of bytes read in from
> > such a binary formatted file .
>
> > For eg the spec says the first two bytes have different parameters in
> > different bits .
> > Byte 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Byte 0
> > SN16 SD9 ? ? ? ?SD8 ? ? SD7 ? ? SD6 ? ? SD5 ? ? SD4 ? ? SD3
> > SD2 ? ? SD1 ? ? SD0 ? ? T4 ? ? ?T3 ? ? ?T2 ? ? ?T1 ? ? ?T0
>
> > I am reading in the two bytes using the following code
>
> > import struct
> > f.seek(0)
> > element1_format = struct.Struct("<H")
> > (element1,) = element1_format.unpack(f.read(2))
>
> > Now element1 has type "str" . How do I apply a bitmask to this to get
> > at information in the component bits .
> > Since the entire file format has many such bitmasked fields and since
> > this is my first venture into binary formats and c-type structs , I
> > wanted to know how to read values inside a byte using python.
> > My few tries at using bitwise operators ( element1 & 0x001f) are
> > frustrated by messages that say " unsupported operand type(s) for &:
> > 'str' and 'int' " .
> > How can I keep my string objects as bits and apply bitmasks to them
> > Any help in this will be greatly appreciated.
> > Thanks
> > hari
>
> Please post a small example that fails as you describe. ?From your example,
> element1 should be an int (unpacked from two bytes), and there is no f
> defined. ?Without the actual code we can't figure out what you are doing
> wrong.
>
> This works as expected:
>
> >>> import struct
> >>> format = struct.Struct("<H")
> >>> (element1,) = format.unpack('aa') # a two-byte string to unpack
> >>> print hex(element1)
> 0x6161
> >>> print element1 & 0x1f
>
> 1
>
> -Mark



From sambit2005 at gmail.com  Tue Feb 24 00:45:54 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Tue, 24 Feb 2009 18:45:54 +1300
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <9e680b420902232145k35b3af51tcc085484377bc88f@mail.gmail.com>

test

On Sat, Feb 21, 2009 at 3:31 AM, Trip Technician <luke.dunn at gmail.com>wrote:

> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jgardner at jonathangardner.net  Tue Feb 24 01:08:28 2009
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Mon, 23 Feb 2009 22:08:28 -0800 (PST)
Subject: How do I count the distance between strings in a list?
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <86df098b-1274-4702-b353-b00418dc51a6@e18g2000yqo.googlegroups.com>

On Feb 23, 9:35?pm, collin <chaosm... at gmail.com> wrote:
> For example, if I were to have the code
>
> randomlist = ["1", "2", "3", "4"]
>
> And I want to count the distance between strings "1" and "4" which is
> 3, what command can I use to do this?

You'd have to get the indexes of the two items and subtract them.
There is an 'index' method on the List object for that.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 24 01:11:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 06:11:29 GMT
Subject: How do I count the distance between strings in a list?
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <pan.2009.02.24.06.11.30@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:35:21 -0800, collin wrote:

> For example, if I were to have the code
> 
> randomlist = ["1", "2", "3", "4"]
> 
> And I want to count the distance between strings "1" and "4" which is 3,
> what command can I use to do this?

This question is ambiguous. It could mean:

int("4") - int("1") 
=> 3

ord("4") - ord("1") 
=> 3

randomlist.index("4") - randomlist.index("1")
=> 3


and possible more as well. Perhaps you should explain what you want to 
do. What do you mean by "distance between strings", and is it important 
that they are in a list?



-- 
Steven


From martin at v.loewis.de  Tue Feb 24 01:11:38 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 24 Feb 2009 07:11:38 +0100
Subject: "Byte" type?
In-Reply-To: <49a36e1c$0$1586$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
	<49a36e1c$0$1586$742ec2ed@news.sonic.net>
Message-ID: <49a38f9b$0$1880$9b622d9e@news.freenet.de>

>> Depends on how you write your code. If you use the bytearray type
>> (which John didn't, despite his apparent believe that he did),
>> then no conversion additional conversion is needed.
> 
>     According to PEP 3137, there should be no distinction between
> the two for read purposes.  In 2.6, there is.  That's a bug.

No. Python 2.6 doesn't implement PEP 3137, and the PEP doesn't claim
that it would, nor do the 2.6 release notes. So that it deviates from
PEP 3137 is not a bug.

>    No, it's broken.  PEP 3137 says one thing, and the 2.6 implementation
> does something else.  So code written for 2.6 won't be ready for 3.0.
> This defeats the supposed point of 2.6.

That's not true: if I write

   if isinstance(x, bytes):
      one_thing()
   elif isinstance(x, unicode):
      another_thing()

then 2to3 will convert it perfectly. 2to3 couldn't have done the
conversion correctly had I written

   if isinstance(x, str):
      one_thing()
   elif isinstance(x, unicode):
      another_thing()

So the introduction of the bytes builtin *does* help the supposed
point of 2.6, even though it doesn't help implementing PEP 3137.

Regards,
Martin


From dhananjay.c.joshi at gmail.com  Tue Feb 24 01:41:09 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Tue, 24 Feb 2009 12:11:09 +0530
Subject: How to read columns in python
Message-ID: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>

I am bit new to python and programming and this might be a basic question:

I have a file containing 3 columns.
first two columns are x and y axes and third column is their corresponding
values in the graph.

I want to read this in a matrix as well as plot in 2D.

Could anyone tell me how to do so the things.

Thanking you in advance



--  Dhananjay
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From clp2 at rebertia.com  Tue Feb 24 01:46:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 22:46:08 -0800
Subject: Problem in accessing files with unicode fonts.
In-Reply-To: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
Message-ID: <50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>

A. Your reason for emailing us off-list makes no sense. The list would
garner you more and about as quick responses, not to mention the value
it adds through public archiving. CC-ing us /might/ have made slight
sense.
B. This is your problem:
    v = unicode(full_path,errors='skip')
I'd advise you to read the docs for `unicode`, particularly what using
'skip' as the value of `errors` does.

Good day.

- Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com> wrote:
> Hello,
> ?? ? ? ? ? Sorry for mailing to your personal mails instead of mailing to
> the group. The reason being the intensity of the problem and time factor.
>
> Prob: I have a folder which contains files with unicode names ( Arabic,
> German etc). I am trying to obtain the attributes of those files recursively
> using win32api.getFileAttributes() function. Here is the code which i have
> for the same:
> ----------------------------------------------------------------------
> #!/usr/bin/env python
> import os
> import os.path
> import sys
> import urllib
> import win32api,string
> def findFile(dir_path):
> ?? ?for name in os.listdir(dir_path):
> ?? ? ? ?full_path = os.path.join(dir_path, name)
> ?? ? ? ?print full_path
> ?? ? ? ?if os.path.isdir(full_path):
> ?? ? ? ? ? ?findFile(full_path)
> ?? ? ? ?else:
> ?? ? ? ? ? ?v = unicode(full_path,errors='skip')
> ?? ? ? ? ? ?i = win32api.GetFileAttributes(v)
>
> findFile("F:\\DataSet\\Unicode")
> ---------------------------------------------------------------
> Now when I run this scirpt, the full_path variable which should contain the
> name of the file has "????" for non english ( I tried Arabic) characters. As
> a result the getfileattributes function is failing to recognise that file
> and is raising an exception.
> full_path:?F:\DataSet\Unicode\Arabic files\Arabic??????????????????????????
> {type is str}
> v:?F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type is
> unicode}
> TraceBack:
> Traceback (most recent call last):
> ??File "E:\venu\Testing Team\unitest.py", line 19, in <module>
> ?? ?findFile("F:\\DataSet\\Unicode")
> ??File "E:\venu\Testing Team\unitest.py", line 13, in findFile
> ?? ?findFile(full_path)
> ??File "E:\venu\Testing Team\unitest.py", line 16, in findFile
> ?? ?i = win32api.GetFileAttributes(v)
> error: (123, 'GetFileAttributes', 'The filename, directory name, or volume
> label syntax is incorrect.')
>
> Waiting for your reply.
> Thank you in advance.
> Venu.


From clp2 at rebertia.com  Tue Feb 24 01:48:11 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 22:48:11 -0800
Subject: How to read columns in python
In-Reply-To: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
Message-ID: <50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>

On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> I am bit new to python and programming and this might be a basic question:
>
> I have a file containing 3 columns.

Your question is much too vague to answer. What defines a "column" for
you? Tab-separated, comma-separated, or something else altogether?

- Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dhananjay.c.joshi at gmail.com  Tue Feb 24 02:08:29 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Tue, 24 Feb 2009 12:38:29 +0530
Subject: How to read columns in python
In-Reply-To: <50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
	<50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
Message-ID: <de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>

Well,

The three columns are tab separated and there are 200 such rows having these
3 columns in the file.

First two columns are x and y coordinates and third column is the
corresponding value.

I want to read this file as a matrix in which column1 correspond to row,
column2 corresponds to columns(in matrix) and column3 corresponds to value
in the matrix.



-- Dhananjay



On Tue, Feb 24, 2009 at 12:18 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay <dhananjay.c.joshi at gmail.com>
> wrote:
> > I am bit new to python and programming and this might be a basic
> question:
> >
> > I have a file containing 3 columns.
>
> Your question is much too vague to answer. What defines a "column" for
> you? Tab-separated, comma-separated, or something else altogether?
>
> - Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>



-- 
--
--------------------------------------------------------------
Dhananjay C Joshi
Project Assistant
Lab of Structural Biology,
C D F D, ECIL Road, Nacharam
Hyderabad-500 076, INDIA
Tel : +91-40-27151344
Fax : +91-40-27155610
--------------------------------------------------------------
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From venutaurus539 at gmail.com  Tue Feb 24 02:15:33 2009
From: venutaurus539 at gmail.com (venu madhav)
Date: Tue, 24 Feb 2009 12:45:33 +0530
Subject: Problem in accessing files with unicode fonts.
In-Reply-To: <50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
Message-ID: <daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>

On Tue, Feb 24, 2009 at 12:16 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> A. Your reason for emailing us off-list makes no sense. The list would
> garner you more and about as quick responses, not to mention the value
> it adds through public archiving. CC-ing us /might/ have made slight
> sense.
> B. This is your problem:
>     v = unicode(full_path,errors='skip')
> I'd advise you to read the docs for `unicode`, particularly what using
> 'skip' as the value of `errors` does.
>
> Good day.
>
> - Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
>
> On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com>
> wrote:
> > Hello,
> >            Sorry for mailing to your personal mails instead of mailing to
> > the group. The reason being the intensity of the problem and time factor.
> >
> > Prob: I have a folder which contains files with unicode names ( Arabic,
> > German etc). I am trying to obtain the attributes of those files
> recursively
> > using win32api.getFileAttributes() function. Here is the code which i
> have
> > for the same:
> > ----------------------------------------------------------------------
> > #!/usr/bin/env python
> > import os
> > import os.path
> > import sys
> > import urllib
> > import win32api,string
> > def findFile(dir_path):
> >     for name in os.listdir(dir_path):
> >         full_path = os.path.join(dir_path, name)
> >         print full_path
> >         if os.path.isdir(full_path):
> >             findFile(full_path)
> >         else:
> >             v = unicode(full_path,errors='skip')
> >             i = win32api.GetFileAttributes(v)
> >
> > findFile("F:\\DataSet\\Unicode")
> > ---------------------------------------------------------------
> > Now when I run this scirpt, the full_path variable which should contain
> the
> > name of the file has "????" for non english ( I tried Arabic) characters.
> As
> > a result the getfileattributes function is failing to recognise that file
> > and is raising an exception.
> > full_path: F:\DataSet\Unicode\Arabic
> files\Arabic??????????????????????????
> > {type is str}
> > v: F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type
> is
> > unicode}
> > TraceBack:
> > Traceback (most recent call last):
> >   File "E:\venu\Testing Team\unitest.py", line 19, in <module>
> >     findFile("F:\\DataSet\\Unicode")
> >   File "E:\venu\Testing Team\unitest.py", line 13, in findFile
> >     findFile(full_path)
> >   File "E:\venu\Testing Team\unitest.py", line 16, in findFile
> >     i = win32api.GetFileAttributes(v)
> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
> volume
> > label syntax is incorrect.')
> >
> > Waiting for your reply.
> > Thank you in advance.
> > Venu.
>

Hello,
        As you've said I went through the documentation for unicode
function.It takes the file name as the first argument and then based on the
second (whether you skip, ignore or strict) does the action. Any of those
ways is not solving my problem. Since, using skip or ignore removes the
unicode characters from the file name, the win32 function is failing to find
that filename. I tried to change the default encoding to unicode in site.py
scirpt but didn't give any results.


Thank you,
Venu
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From mcfletch at vrplumber.com  Tue Feb 24 02:30:41 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 24 Feb 2009 02:30:41 -0500
Subject: ANN: SuPy 1.6
In-Reply-To: <49A3561A.8000900@canterbury.ac.nz>
References: <49A3561A.8000900@canterbury.ac.nz>
Message-ID: <49A3A221.8070602@vrplumber.com>

Greg Ewing wrote:
...
> What is SuPy?
> -------------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
Hi Greg,

Can you review the SuPy writeup on Py3D?  I couldn't get through to your 
server this evening, so I couldn't check the license, if there's 
anything else you feel should be said about the program, let me know.

http://www.vrplumber.com/py3d.py#supy

Have fun,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From apardon at forel.vub.ac.be  Tue Feb 24 02:54:07 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 24 Feb 2009 07:54:07 GMT
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
	<mailman.9270.1234301142.3487.python-list@python.org>
Message-ID: <slrngq79su.g4q.apardon@rcpc42.vub.ac.be>

On 2009-02-10, Albert Hopkins <marduk at letterboxes.org> wrote:
> On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:
>
> I don't understand what you mean by this.  But if you really want to
> know if a generator is "non-empty":
>
> def non_empty(virgin_generator):
>     try:
>         virgin_generator.next() # note you just lost the first value
>         return True
>     except StopIteration:
>         return False
>
> The only way to get around this is to put all the values of a generator
> inside a container (e.g. a list):
>
> l = list(generator_object)
>
> but in doing so you've (obviously) lost the advantages of the generator.

Well he could always use a wrapper like the following:

nothing = object()

class BoolIterator (object):
  def __init__(self, iter):
    self.iter = iter
    self.value = nothing
    self.item = nothing

  def __iter__(self):
    return (self)

  def __nonzero__(self):
    if self.value is nothing:
      try:
        self.item = self.iter.next()
        self.value = True
        return True
      except StopIteration:
        self.value = False
        return False
    else:
      return self.value

  def next(self):
    if self.item is not nothing:
      result = self.item
      self.item = nothing
      return result
    if self.value is not nothing:
      return self.iter.next()
    else:
      try:
        result = self.iter.next()
        self.value = True
        return result
      except StopIteration:
        self.value = False
        raise

it1 = BoolIterator(i for i in xrange(10))

for i in it1:
  print i

it2 = BoolIterator(i for i in xrange(10))

if it2:
  print "item found"
  for i in it2:
    print i
else:
  print "problem"

it3 = BoolIterator(i for i in xrange(0))

if it3:
  print "problem"
else:
  print "it3 is empty"



From metolone+gmane at gmail.com  Tue Feb 24 02:56:54 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Mon, 23 Feb 2009 23:56:54 -0800
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com><50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
Message-ID: <go0982$msn$1@ger.gmane.org>

Try os.walk for recursively walking directories.  Also if you use a unicode parameter with os.walk or os.listdir you get unicode strings in the result.  To run this successfully when you have non-ascii characters in your filenames, you will need to use an environment that supports the characters you want to print.  The Windows console, for example, typically only supports a native encoding such as cp437 or cp1252 (on U.S. systems).  If all else fails write the output to a file in your favorite encoding:

# coding: gbk
import os
import codecs
output = codecs.open(u'??.txt','wt',encoding='utf-8')
for path,dirs,files in os.walk(u'.'):
    for fname in files:
        output.write(os.path.join(path,fname)+'\n')
output.close()


-Mark

  "venu madhav" <venutaurus539 at gmail.com> wrote in message news:daf1e02e0902232315j7e66593ewecfdd739972ad676 at mail.gmail.com...



  On Tue, Feb 24, 2009 at 12:16 PM, Chris Rebert <clp2 at rebertia.com> wrote:

    A. Your reason for emailing us off-list makes no sense. The list would
    garner you more and about as quick responses, not to mention the value
    it adds through public archiving. CC-ing us /might/ have made slight
    sense.
    B. This is your problem:

       v = unicode(full_path,errors='skip')

    I'd advise you to read the docs for `unicode`, particularly what using
    'skip' as the value of `errors` does.

    Good day.

    - Chris

    --
    Follow the path of the Iguana...
    http://rebertia.com



    On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com> wrote:
    > Hello,
    >            Sorry for mailing to your personal mails instead of mailing to
    > the group. The reason being the intensity of the problem and time factor.
    >
    > Prob: I have a folder which contains files with unicode names ( Arabic,
    > German etc). I am trying to obtain the attributes of those files recursively
    > using win32api.getFileAttributes() function. Here is the code which i have
    > for the same:
    > ----------------------------------------------------------------------
    > #!/usr/bin/env python
    > import os
    > import os.path
    > import sys
    > import urllib
    > import win32api,string
    > def findFile(dir_path):
    >     for name in os.listdir(dir_path):
    >         full_path = os.path.join(dir_path, name)
    >         print full_path
    >         if os.path.isdir(full_path):
    >             findFile(full_path)
    >         else:
    >             v = unicode(full_path,errors='skip')
    >             i = win32api.GetFileAttributes(v)
    >
    > findFile("F:\\DataSet\\Unicode")
    > ---------------------------------------------------------------
    > Now when I run this scirpt, the full_path variable which should contain the
    > name of the file has "????" for non english ( I tried Arabic) characters. As
    > a result the getfileattributes function is failing to recognise that file
    > and is raising an exception.
    > full_path: F:\DataSet\Unicode\Arabic files\Arabic??????????????????????????
    > {type is str}
    > v: F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type is
    > unicode}
    > TraceBack:
    > Traceback (most recent call last):
    >   File "E:\venu\Testing Team\unitest.py", line 19, in <module>
    >     findFile("F:\\DataSet\\Unicode")
    >   File "E:\venu\Testing Team\unitest.py", line 13, in findFile
    >     findFile(full_path)
    >   File "E:\venu\Testing Team\unitest.py", line 16, in findFile
    >     i = win32api.GetFileAttributes(v)
    > error: (123, 'GetFileAttributes', 'The filename, directory name, or volume
    > label syntax is incorrect.')
    >
    > Waiting for your reply.
    > Thank you in advance.
    > Venu.



  Hello,
          As you've said I went through the documentation for unicode function.It takes the file name as the first argument and then based on the second (whether you skip, ignore or strict) does the action. Any of those ways is not solving my problem. Since, using skip or ignore removes the unicode characters from the file name, the win32 function is failing to find that filename. I tried to change the default encoding to unicode in site.py scirpt but didn't give any results.




  Thank you,
  Venu


------------------------------------------------------------------------------


  --
  http://mail.python.org/mailman/listinfo/python-list
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From ccormie at aussiemail.com.au  Tue Feb 24 03:00:26 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 19:00:26 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
	<01b364cd$0$5185$c3e8da3@news.astraweb.com>
	<68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>
Message-ID: <01b39e7f$0$20621$c3e8da3@news.astraweb.com>


> My reading of the Python 2.6.1 version of dynload_win.c tells me that:
> 
> 1. It uses LoadLibraryEx() to attempt to load the pyd given its full
> pathname
> 
> 2. If that fails, it gets the Windows error code using GetLastError()
> 
> 3. It gets the Windows message text using FormatMessage()
> 
> 4. It assembles the message as "DLL load failed: " plus the Windows
> message text (less any trailing "\r\n").
> 
> Note that if the pyd load succeeds, it rummages in memory to find the
> pythonxx.dll used by the pyd so that it can be checked for
> consistency. Then and only then it uses GetProcAddress() to get the
> address of the initFOO function.
> 
> Do you know a way of getting more info out of Windows than GetLastError
> ()?

Thank you for your help, it is much appreciated:

In summary:

Q) How can one get Python to tell you which symbol is causing a problem 
when it loads an extension with a bad reference to a symbol in a DLL it 
uses?

A) There is no such way: you *must* use external tools: When a symbol is 
missing form a DLL that a Python extension depends on, the failure will 
be picked up in Python immediately on attempting to load the extension: 
the extension code is never reached and there is no specific attempt 
made in Python to resolve the problem symbol. further, The normal 
platform APIs lack the ability to determine the cause of the load failure.

 > Do you know a way of getting more info out of Windows than GetLastError
 > ()?

No, but presumably the ability to determine in code that a DLL has a bad 
reference and which symbol is bad exists because the depends program is 
able to do it. Of course it's a separate question as to whether Python 
wants to load itself down with complex platform specific code for a 
small corner case.

Best Regards,
Chris.


From sjmachin at lexicon.net  Tue Feb 24 03:07:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 00:07:50 -0800 (PST)
Subject: read csv error question
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com> 
	<mailman.595.1235432572.11746.python-list@python.org>
Message-ID: <1a434a76-f956-4848-a1eb-e46f96476f61@v39g2000yqm.googlegroups.com>

On Feb 24, 10:42?am, rdmur... at bitdance.com wrote:
> Vincent Davis <vinc... at vincentdavis.net> wrote:
> > I am trying to read a csv file from excel on a mac. I get the following
> > error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
> > field - do you need to open the file in universal-newline mode?
> > I was using the example code
> > import csv, sys
>
> > reader = csv.reader(open('/Volumes/vincentdavis
> > 2/match/data/matchdata2008.csv', "rb"))
> > try:
> > ? ? for row in reader:
> > ? ? ? ? print row
> > except csv.Error, e:
> > ? ? sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>
> > I think this has to do with the end of line character but I am unsure how to
> > fix it. I don't what to change the actual csv file I would like to fix the
> > code.
>
> You could try reading the error message and looking at the documentation
> of the 'open' function. ?Pay particular attention to the keywords
> 'universal-newline mode'.
>
> Hint: 'rb' is almost the opposite of universal newline mode, and
> it is very rare that you'd want to use 'b' to read a text file.
>
> --RDM

A CSV file is *NOT* a text file. See the module docs. Also see this:
http://bugs.python.org/issue4847


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 03:39:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 06:39:17 -0200
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
	<1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>
Message-ID: <op.upukzrtlx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 01:29:07 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

>         First of all thanks for your response. I've written a function
> as shown below to recurse a directory and return a file based on the
> value of n. I am calling this fucntion from my main code to catch that
> filename. The folder which it recurses through contains a folder
> having files with unicode names (as an example i've given earlier.


> ---------------------------------------------------------------
> def findFile(dir_path):
>     for name in os.listdir(dir_path):
>         full_path = os.path.join(dir_path, name)
>         print full_path
>         if os.path.isdir(full_path):
>             findFile(full_path)

Here, you're simply discarding the result from the recursive call. Try  
something like this:

              result = findFile(full_path)
              if result is not None:
                  return result

>         else:
>             n = n - 1
>             if(n ==0):
>                 return full_path
> ---------------------------------------------------------------

Now, what happens if you forget about findFile and try with a direct name  
instead?

fpath =  
r"E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder\0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt"
st = os.stat(path)
print st

-- 
Gabriel Genellina



From andrew at acooke.org  Tue Feb 24 03:44:01 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 24 Feb 2009 05:44:01 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
Message-ID: <a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>

Steven D'Aprano wrote:
> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>
>> Steven D'Aprano wrote:
>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>
>>>> as far as i understand things, the best model is:
>>>>
>>>> 1 - everything is an object
>>>> 2 - everything is passed by reference
>>>
>>> Except that is wrong. If it were true, you could do this:
>> [pointer swapping]
>>
>> i was thinking of how the stack is used; i would have called what you
>> are talking about "pointer semantics".  however, on reading around a
>> little, it seems that i'm in a very small minority (which is a pity,
>> because if you restrict the meaning to how values are handled on the
>> stack then you get a lot closer to having just values and references,
>> rather than the whole pile of different terms that are apparently in
>> use).
>>
>> sorry for the confusion,
>
> Why is it a pity to have a whole pile of different terms to describe a
> whole lot of different behaviours? I would suggest the real confusion
> would be if we had two terms to describe a dozen different parameter-
> passing conventions.

because:

(1) it's often useful to explain things as (simpler) orthogonal components
rather than globbing everything under one term; that lets you more easily
carry across knowledge from previous experience.

(2) while using a term that has (according to wikipedia) "widespread usage
in the Python community" helps you save time and avoid confusion, it
doesn't necessarily explain best to someone from outside that community
what is happening.  in this particular case you are getting dangerously
close to having a term that is used only for one language and which,
therefore, is at risk of meaning little more that "the way python does it"
(which is, i think you'll agree, more tautological than helpful).

andrew




From gagsl-py2 at yahoo.com.ar  Tue Feb 24 03:44:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 06:44:27 -0200
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
Message-ID: <op.upuk8depx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 05:15:33 -0200, venu madhav <venutaurus539 at gmail.com>  
escribi?:

>> > def findFile(dir_path):
>> >     for name in os.listdir(dir_path):
>> >         full_path = os.path.join(dir_path, name)
>> >         print full_path
>> >         if os.path.isdir(full_path):
>> >             findFile(full_path)
>> >         else:
>> >             v = unicode(full_path,errors='skip')
>> >             i = win32api.GetFileAttributes(v)
>> >
>> > findFile("F:\\DataSet\\Unicode")
>> > ---------------------------------------------------------------
>> > Now when I run this scirpt, the full_path variable which should  
>> contain
>> the
>> > name of the file has "????" for non english ( I tried Arabic)  
>> characters.
>> As
>> > a result the getfileattributes function is failing to recognise that  
>> file
>> > and is raising an exception.
>> >     i = win32api.GetFileAttributes(v)
>> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
>> volume
>> > label syntax is incorrect.')

If you call os.listdir with an unicode directory, it returns unicode file  
names.
That is (after correcting the previous error in findFile), call it using:
findFile(u"F:\\DataSet\\Unicode")

-- 
Gabriel Genellina



From venutaurus539 at gmail.com  Tue Feb 24 04:18:41 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 01:18:41 -0800 (PST)
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com> 
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com> 
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com> 
	<mailman.648.1235465092.11746.python-list@python.org>
Message-ID: <e621cf58-54d9-4aab-b5e9-1a853844074c@n2g2000vba.googlegroups.com>

On Feb 24, 1:44?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 24 Feb 2009 05:15:33 -0200, venu madhav <venutaurus... at gmail.com> ?
> escribi?:
>
>
>
> >> > def findFile(dir_path):
> >> > ? ? for name in os.listdir(dir_path):
> >> > ? ? ? ? full_path = os.path.join(dir_path, name)
> >> > ? ? ? ? print full_path
> >> > ? ? ? ? if os.path.isdir(full_path):
> >> > ? ? ? ? ? ? findFile(full_path)
> >> > ? ? ? ? else:
> >> > ? ? ? ? ? ? v = unicode(full_path,errors='skip')
> >> > ? ? ? ? ? ? i = win32api.GetFileAttributes(v)
>
> >> > findFile("F:\\DataSet\\Unicode")
> >> > ---------------------------------------------------------------
> >> > Now when I run this scirpt, the full_path variable which should ?
> >> contain
> >> the
> >> > name of the file has "????" for non english ( I tried Arabic) ?
> >> characters.
> >> As
> >> > a result the getfileattributes function is failing to recognise that ?
> >> file
> >> > and is raising an exception.
> >> > ? ? i = win32api.GetFileAttributes(v)
> >> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
> >> volume
> >> > label syntax is incorrect.')
>
> If you call os.listdir with an unicode directory, it returns unicode file ?
> names.
> That is (after correcting the previous error in findFile), call it using:
> findFile(u"F:\\DataSet\\Unicode")
>
> --
> Gabriel Genellina

Thank you for your solution. It really helped. But how should I give
if my path is in a varialble.

For ex: path has that value obtained through command line arguments.

path = sys.argv[2]

In such a case how can we convert the path to UNICODE?

Thank you once again,
Venu







From nick at craig-wood.com  Tue Feb 24 04:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 24 Feb 2009 03:31:53 -0600
Subject: intermediate python csv reader/writer question from a beginner
References: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
Message-ID: <slrngq7e5s.sms.nick@irishsea.home.craig-wood.com>

Learning Python <labmice at gmail.com> wrote:
>  anything related to csv, I usually use VB within excel to manipulate
>  the data, nonetheless, i finally got the courage to take a dive into
>  python.  i have viewed a lot of googled csv tutorials, but none of
>  them address everything i need.  Nonetheless, I was wondering if
>  someone can help me manipulate the sample csv (sample.csv) I have
>  generated:
> 
>  ,,
>  someinfo,,,,,,,
>  somotherinfo,,,,,,,
>  SEQ,Names,Test1,Test2,Date,Time,,
>  1,Adam,1,2,Monday,1:00 PM,,
>  2,Bob,3,4,Monday,1:00 PM,,
>  3,Charlie,5,6,Monday,1:00 PM,,
>  4,Adam,7,8,Monday,2:00 PM,,
>  5,Bob,9,10,Monday,2:00 PM,,
>  6,Charlie,11,12,Monday,2:00 PM,,
>  7,Adam,13,14,Tuesday,1:00 PM,,
>  8,Bob,15,16,Tuesday,1:00 PM,,
>  9,Charlie,17,18,Tuesday,1:00 PM,,
> 
>  into (newfile.csv):
> 
>  Adam-Test1,Adam-Test2,Bob-Test1,Bob-Test2,Charlie-Test1,Charlie-
>  Test2,Date,Time
>  1,2,3,4,5,6,Monday,1:00 PM
>  7,8,9,10,11,12,Monday,2:00 PM
>  13,14,15,16,17,18,Tuesday,1:00 PM
> 
>  note:
>  1. the true header doesn't start line 4 (if this is the case would i
>  have to use "split"?)
>  2. if there were SEQ#10-12, or 13-15, it would still be Adam, Bob,
>  Charlie, but with different Test1/Test2/Date/Time

I'm not really sure what you are trying to calculate, but this should
give you some ideas...

import csv
from collections import defaultdict

reader = csv.reader(open("sample.csv"))
result = defaultdict(list)
for row in reader:
    # ignore unless first row is numeric
    if not row or not row[0].isdigit():
        continue
    n, name, a, b, day, time = row[:6]
    print "n=%r, name=%r, a=%r, b=%r, day=%r, time=%r" % (n, name, a,
    b, day, time)
    result[(day, time)].append(n)

writer = csv.writer(open("newfile.csv", "w"))
for key, values in result.iteritems():
    day, time = key
    values = values + [day, time]
    writer.writerow(values)

This prints

n='1', name='Adam', a='1', b='2', day='Monday', time='1:00 PM'
n='2', name='Bob', a='3', b='4', day='Monday', time='1:00 PM'
n='3', name='Charlie', a='5', b='6', day='Monday', time='1:00 PM'
n='4', name='Adam', a='7', b='8', day='Monday', time='2:00 PM'
n='5', name='Bob', a='9', b='10', day='Monday', time='2:00 PM'
n='6', name='Charlie', a='11', b='12', day='Monday', time='2:00 PM'
n='7', name='Adam', a='13', b='14', day='Tuesday', time='1:00 PM'
n='8', name='Bob', a='15', b='16', day='Tuesday', time='1:00 PM'
n='9', name='Charlie', a='17', b='18', day='Tuesday', time='1:00 PM'

And leaves newfile.csv with the contents

1,2,3,Monday,1:00 PM
7,8,9,Tuesday,1:00 PM
4,5,6,Monday,2:00 PM

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 04:36:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 07:36:51 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>
Message-ID: <op.upunnpivx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 06:44:01 -0200, andrew cooke <andrew at acooke.org>  
escribi?:

> Steven D'Aprano wrote:
>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>
>>> Steven D'Aprano wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>> [pointer swapping]
>>>
>>> i was thinking of how the stack is used; i would have called what you
>>> are talking about "pointer semantics".  however, on reading around a
>>> little, it seems that i'm in a very small minority (which is a pity,
>>> because if you restrict the meaning to how values are handled on the
>>> stack then you get a lot closer to having just values and references,
>>> rather than the whole pile of different terms that are apparently in
>>> use).
>>>
>>> sorry for the confusion,
>>
>> Why is it a pity to have a whole pile of different terms to describe a
>> whole lot of different behaviours? I would suggest the real confusion
>> would be if we had two terms to describe a dozen different parameter-
>> passing conventions.
>
> because:
>
> (1) it's often useful to explain things as (simpler) orthogonal  
> components
> rather than globbing everything under one term; that lets you more easily
> carry across knowledge from previous experience.
>
> (2) while using a term that has (according to wikipedia) "widespread  
> usage
> in the Python community" helps you save time and avoid confusion, it
> doesn't necessarily explain best to someone from outside that community
> what is happening.  in this particular case you are getting dangerously
> close to having a term that is used only for one language and which,
> therefore, is at risk of meaning little more that "the way python does  
> it"
> (which is, i think you'll agree, more tautological than helpful).

But -paraphrasing A.E.- we should explain it in the simplest terms, but  
not simpler.

Some people think that there exist only two possible ways to pass an  
argument: by value or by reference. The way Python does it doesn't have  
the same properties that pass-by-value nor pass-by-reference have in other  
languages, so both names are inapropiate. You appear to favor the "by  
reference" name. A couple months ago some other guy were strongly  
defending the "by value" name -- he even set up a website supporting his  
idea.

The fact is, if you say "it's by value" you'll disappoint some  
expectations from some users, and if you say "it's by reference" you'll  
disappoint some other expectations. So you must say something different  
("it's by reference, but the references cannot be modified (!), and...",  
"it's by value, but the values are references (!!), and...", or whatever  
description you choose). Given that, it's better to use a different name:  
you're going to explain the concept anyway.

And Python isn't the first language using this convention; if you look in  
the FAQ or search recent threads in this group you'll find references  
going back to the '70s.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Feb 24 04:45:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 07:45:35 -0200
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
	<mailman.648.1235465092.11746.python-list@python.org>
	<e621cf58-54d9-4aab-b5e9-1a853844074c@n2g2000vba.googlegroups.com>
Message-ID: <op.upun19z3x6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 07:18:41 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

> Thank you for your solution. It really helped. But how should I give
> if my path is in a varialble.
>
> For ex: path has that value obtained through command line arguments.
>
> path = sys.argv[2]
>
> In such a case how can we convert the path to UNICODE?

If you know the encoding used for your file names, use it; else try  
sys.getfilesystemencoding()

fsencoding = sys.getfilesystemencoding()
path = sys.argv[2].decode(fsencoding)

-- 
Gabriel Genellina



From andrew at acooke.org  Tue Feb 24 04:58:08 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 24 Feb 2009 06:58:08 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <op.upunnpivx6zn5v@gabriel.sleipnir-bsas>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>
	<op.upunnpivx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <51a82ff3d4a9eee147380c48e72e0cb2.squirrel@localhost>

Gabriel Genellina wrote:
> En Tue, 24 Feb 2009 06:44:01 -0200, andrew cooke <andrew at acooke.org>
> escribi?:
>
>> Steven D'Aprano wrote:
>>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>>
>>>> Steven D'Aprano wrote:
>>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>>
>>>>>> as far as i understand things, the best model is:
>>>>>>
>>>>>> 1 - everything is an object
>>>>>> 2 - everything is passed by reference
>>>>>
>>>>> Except that is wrong. If it were true, you could do this:
>>>> [pointer swapping]
>>>>
>>>> i was thinking of how the stack is used; i would have called what you
>>>> are talking about "pointer semantics".  however, on reading around a
>>>> little, it seems that i'm in a very small minority (which is a pity,
>>>> because if you restrict the meaning to how values are handled on the
>>>> stack then you get a lot closer to having just values and references,
>>>> rather than the whole pile of different terms that are apparently in
>>>> use).
>>>>
>>>> sorry for the confusion,
>>>
>>> Why is it a pity to have a whole pile of different terms to describe a
>>> whole lot of different behaviours? I would suggest the real confusion
>>> would be if we had two terms to describe a dozen different parameter-
>>> passing conventions.
>>
>> because:
>>
>> (1) it's often useful to explain things as (simpler) orthogonal
>> components
>> rather than globbing everything under one term; that lets you more
>> easily
>> carry across knowledge from previous experience.
>>
>> (2) while using a term that has (according to wikipedia) "widespread
>> usage
>> in the Python community" helps you save time and avoid confusion, it
>> doesn't necessarily explain best to someone from outside that community
>> what is happening.  in this particular case you are getting dangerously
>> close to having a term that is used only for one language and which,
>> therefore, is at risk of meaning little more that "the way python does
>> it"
>> (which is, i think you'll agree, more tautological than helpful).
>
> But -paraphrasing A.E.- we should explain it in the simplest terms, but
> not simpler.
>
> Some people think that there exist only two possible ways to pass an
> argument: by value or by reference. The way Python does it doesn't have
> the same properties that pass-by-value nor pass-by-reference have in other
> languages, so both names are inapropiate. You appear to favor the "by
> reference" name. A couple months ago some other guy were strongly
> defending the "by value" name -- he even set up a website supporting his
> idea.
>
> The fact is, if you say "it's by value" you'll disappoint some
> expectations from some users, and if you say "it's by reference" you'll
> disappoint some other expectations. So you must say something different
> ("it's by reference, but the references cannot be modified (!), and...",
> "it's by value, but the values are references (!!), and...", or whatever
> description you choose). Given that, it's better to use a different name:
> you're going to explain the concept anyway.


if you read my post i think you'll find i was not advocating either of those.

i really think this discussion has gone on far enough; i have better
things to do.

andrew


> And Python isn't the first language using this convention; if you look in
> the FAQ or search recent threads in this group you'll find references
> going back to the '70s.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From pavlovevidence at gmail.com  Tue Feb 24 05:04:16 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 24 Feb 2009 02:04:16 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com> 
	<mailman.587.1235430309.11746.python-list@python.org>
	<794a35cc-f530-43e7-97c5-87694f27b573@x9g2000yqk.googlegroups.com>
Message-ID: <9095ae87-c11d-4439-aeed-05533c610e54@m24g2000vbp.googlegroups.com>

On Feb 23, 9:13?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? It occurred to me that I might just want to try copying the
> subprocess.py installed in a /usr/lib/python24 installation to the
> directory where I place the scripts that I need to launch my
> application...I know this was mentioned earlier. ?Anyway, my
> application worked under python 2.3 and later python versions as
> well. ?Here is what I did:
>
> I renamed subprocess.py to subprocess23.py and then used the following
> code:
>
> try:
> ? import subprocess
> except ImportError:
> ? import subprocess23 as subprocess
>
> I chose this route because I took a deeper look at the code in the
> subprocess module and I also realized that I would not be able to use
> the popen2, because I would not be able to do things like os.setpgrp
> for preexec_fn, with popen2. ?In the end, if I wanted that type of
> functionality I would have to use os.dup, fork, exec, which meant
> reinventing the wheel. ?I overcame the issue of dealing with msvcrt
> and _subprocess under windows by requiring python24 or greater under
> windows.


Distributing the interpreter doesn't look quite as silly as it did
this morning now, does it?


Carl Banks


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 05:33:11 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 08:33:11 -0200
Subject: tkinter icons as bytestrings, not files?
References: <slrngq6vfd.2u7.peter@box8.pjb.com.au>
Message-ID: <op.upup9ljcx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 02:56:12 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> As a newbie, starting with Python3, I'm working my way through Mark
> Summerfield's tkinter examples.  In the toolbar, there's lines like:

>     image = os.path.join(os.path.dirname(__file__), image)
>     image = tkinter.PhotoImage(file=image)
>
> which are always failing because the icons are in the wrong place
> and I can't help but wonder if I can put all these little images
> in the application itself, either as b'whatever' or uuencoded or
> in svg etc, and then invoke some suitable variation of the
>     image = tkinter.PhotoImage(file=image)
> or of the
>     button = tkinter.Button(toolbar, image=image, command=command)
> command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
> magic key (unless it's "data=something, format=something")) ...

Almost; see the best documentation source for tkinter:
http://effbot.org/tkinterbook/photoimage.htm

-- 
Gabriel Genellina



From yatsek at gmail.com  Tue Feb 24 05:48:10 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Tue, 24 Feb 2009 02:48:10 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
References: <00e56c9a-85a7-440c-a48d-2a0ea9e00992@j35g2000yqh.googlegroups.com>
Message-ID: <dfede125-d8eb-4fbb-b45a-0f52a9acf4c0@d32g2000yqe.googlegroups.com>

OK I found workaround.

So just for other fighting the same thing:
Instead of using tlslite use pyOpenSSL and as a base for your server
you can use:
http://code.activestate.com/recipes/442473/

When you add do_POST method everything works

greetz
Jacek


From steve at pearwood.info  Tue Feb 24 05:49:26 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 24 Feb 2009 21:49:26 +1100
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<mailman.647.1235465046.11746.python-list@python.org>
Message-ID: <01b3c619$0$23707$c3e8da3@news.astraweb.com>

andrew cooke wrote:

> Steven D'Aprano wrote:
>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>
>>> Steven D'Aprano wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>> [pointer swapping]
>>>
>>> i was thinking of how the stack is used; i would have called what you
>>> are talking about "pointer semantics".  however, on reading around a
>>> little, it seems that i'm in a very small minority (which is a pity,
>>> because if you restrict the meaning to how values are handled on the
>>> stack then you get a lot closer to having just values and references,
>>> rather than the whole pile of different terms that are apparently in
>>> use).
>>>
>>> sorry for the confusion,
>>
>> Why is it a pity to have a whole pile of different terms to describe a
>> whole lot of different behaviours? I would suggest the real confusion
>> would be if we had two terms to describe a dozen different parameter-
>> passing conventions.
> 
> because:
> 
> (1) it's often useful to explain things as (simpler) orthogonal components
> rather than globbing everything under one term; 

"One term"? 

If you look at this Wikipedia page:

http://en.wikipedia.org/wiki/Evaluation_strategy

you should be able to count no fewer than thirteen different terms for 
different evaluation strategies, and "call-by-value" itself is described as
a family of strategies. Who is gobbing everything under one term? Certainly
not me. If anything, your preferred tactic is to gob everything under one
of two terms, call-by-value and call-by-reference. That's not my preferred
tactic.


> that lets you more easily 
> carry across knowledge from previous experience.

That's only useful if that previous experience *clarifies* rather than
*confuses*. This very thread demonstrates that people's prior knowledge of
call-by-whatever doesn't clarify Python's behaviour.


> (2) while using a term that has (according to wikipedia) "widespread usage
> in the Python community" helps you save time and avoid confusion, it
> doesn't necessarily explain best to someone from outside that community
> what is happening.  

And you think call-by-reference does?

Python demonstrably does not behave like call-by-reference in other
languages. I do not agree that it is wise to hammer the round peg of
Python's actual behaviour into the square peg of newbies' concept of
call-by-reference. 


> in this particular case you are getting dangerously 
> close to having a term that is used only for one language 

So what? What if Python was the only language that used the term? That
doesn't make it inappropriate. If the users of other languages that use
call-by-object semantics (Java, RealBasic, etc) choose to prefer a
misleading name over a descriptive name, that's no reason for Python users
to follow down their path.


> and which, 
> therefore, is at risk of meaning little more that "the way python does it"
> (which is, i think you'll agree, more tautological than helpful).

No at all. Do you imagine that call-by-name means "the way Algol does it"?
Algol is the only major language that uses call-by-name, it may even be the
only language of any size, but that doesn't mean that call-by-name can't be
defined and described independently of Algol. There's even a test,
Knuth's "Man Or Boy Test", for testing how well a language implements
call-by-name semantics.



-- 
Steven



From pablo.stapff at gmail.com  Tue Feb 24 06:18:26 2009
From: pablo.stapff at gmail.com (PS)
Date: Tue, 24 Feb 2009 03:18:26 -0800 (PST)
Subject: undefined reference to `init_warnings'  when compiling after 
	freeze...
Message-ID: <3d4eed77-ed87-4a14-bc68-8887ddeb4389@j12g2000vbl.googlegroups.com>

Hello Python users

I am trying to compile .py files using freeze with Python 2.6.1, but I
get an error even when trying with hello.py from the examples.

Freeze semes to do its work (last lines only):

ps at linux-s7f4:~/soft/Python-2.6.1/Tools/freeze> python freeze.py
hello.py

generating table of frozen modules
Warning: unknown modules remain: _bisect _collections _ctypes
_functools _heapq _locale _random _socket _ssl _struct array binascii
cPickle cStringIO fcntl itertools math operator readline select strop
termios time
Now run "make" to build the target: hello

Now comes make:

ps at linux-s7f4:~/soft/Python-2.6.1/Tools/freeze> make
gcc -pthread  -Xlinker -export-dynamic config.o frozen.o
M_BaseHTTPServer.o M_FixTk.o M_SocketServer.o M_StringIO.o
M_Tkconstants.o M_Tkinter.o M_UserDict.o M___future__.o M___main__.o
M__abcoll.o M__threading_local.o M_abc.o M_base64.o M_bdb.o M_bisect.o
M_cmd.o M_codecs.o M_collections.o M_copy.o M_copy_reg.o
M_ctypes.oM_ctypes___endian.o M_ctypes__macholib.o
M_ctypes__macholib__dyld.o M_ctypes__macholib__dylib.o
M_ctypes__macholib__framework.o M_ctypes__util.o M_difflib.o M_dis.o
M_distutils.o M_distutils__dep_util.o M_distutils__errors.o
M_distutils__log.o M_distutils__spawn.o M_distutils__sysconfig.o
M_distutils__text_file.o M_distutils__util.o M_doctest.o
M_dummy_thread.o M_dummy_threading.o M_email.o M_email___parseaddr.o
M_email__base64mime.o M_email__charset.o M_email__encoders.o
M_email__errors.o M_email__feedparser.o M_email__message.o
M_email__mime.o M_email__parser.o M_email__quoprimime.o
M_email__utils.o M_encodings.o M_encodings__aliases.o M_fnmatch.o
M_formatter.o M_ftplib.o M_functools.o M_genericpath.o M_getopt.o
M_getpass.o M_gettext.o M_glob.o M_heapq.o M_httplib.o M_inspect.o
M_keyword.o M_linecache.o M_locale.o M_macurl2path.o M_mimetools.o
M_mimetypes.o M_ntpath.o M_nturl2path.o M_opcode.o M_optparse.o M_os.o
M_os2emxpath.o M_pdb.o M_pickle.o M_pkgutil.o M_posixpath.o M_pprint.o
M_py_compile.o M_pydoc.o M_pydoc_topics.o M_quopri.o M_random.o M_re.o
M_repr.oM_rfc822.o M_shlex.o M_site.o M_socket.o M_sre_compile.o
M_sre_constants.o M_sre_parse.o M_ssl.o M_stat.o M_string.o M_struct.o
M_subprocess.o M_tempfile.o M_textwrap.o M_threading.o M_token.o
M_tokenize.o M_traceback.o M_tty.o M_types.o M_unittest.o M_urllib.o
M_urlparse.o M_uu.o M_warnings.o M_webbrowser.o /home/ps/app/lib/
python2.6/config/libpython2.6.a   -lpthread -ldl  -lutil -lm  -o hello
/home/ps/app/lib/python2.6/config/libpython2.6.a(posixmodule.o): In
function `posix_tmpnam':
/home/ps/soft/Python-2.6.1/./Modules/posixmodule.c:7079: warning: the
use of `tmpnam_r' is dangerous, better use `mkstemp'
/home/ps/app/lib/python2.6/config/libpython2.6.a(posixmodule.o): In
function `posix_tempnam':
/home/ps/soft/Python-2.6.1/./Modules/posixmodule.c:7034: warning: the
use of `tempnam' is dangerous, betteruse `mkstemp'
config.o:(.data+0x28): undefined reference to `init_warnings'
collect2: ld returned 1 exit status
make: *** [hello] Error 1


I tested it on OpenSuSe 11.0 and Ubuntu 8.10 with the same results.

Did somebody experienced the same problem?

With Python 2.5.1 it works without problems.

Thanks in advance
Pablo


From gandalf at shopzeus.com  Tue Feb 24 06:22:41 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 12:22:41 +0100
Subject: try except question - serious foo bar question, and pulling my hair
	out :-)
Message-ID: <49A3D881.4070500@shopzeus.com>

Given this class below:

import Queue
import threading
from sorb.util.dumpexc import dumpexc
import waitablemixin


PREFETCH_SIZE = 10

class Feeder(threading.Thread,waitablemixin.WaitableMixin):
    def __init__(self,connection_manager):
        self.cm = connection_manager
        self.expired_asins = Queue.Queue()
        self.logger = self.cm.loggerfactory.get_logger("feeder")
        threading.Thread.__init__(self)

    def run(self):
        try:
            try:
                d = self.cm.create_dispatcher()
                try:
                    od_producer = d.locate('od_producer')
                    while not self.cm.stop_requested.isSet():
                        try:
                            items = od_producer.getsomeasins()
                            if items:
                                self.logger.info("Got %d items to 
process",len(items))
                                for item in items:
                                    self.expired_asins.put(item)
                                if self.expired_asins.qsize()>PREFETCH_SIZE:
                                    while 
(self.expired_asins.qsize()>PREFETCH_SIZE) and \
                                        not self.cm.stop_requested.isSet():
                                        self.logger.info(
                                            "%s (>%s) items in the 
queue, waiting...",
                                            self.expired_asins.qsize(),
                                            PREFETCH_SIZE
                                        )
                                        self.waitsome(1)
                            else:
                                self.logger.info("No more items to 
process, will wait 5 minutes.")
                                self.waitsome(5*60)
                        except Exception,e:
                            self.logger.error("Could not get asins: 
%s",dumpexc(e) )
                            self.logger.error("Will retry in 10 seconds.")
                            self.waitsome(10)
                finally:
                    d.close()
            except Exception,e:
                self.cm.stop_requested.set()
                self.logger.error(dumpexc(e))
        finally:
            self.logger.error("Feeder stopped. stop_requested = 
%s",str(self.cm.stop_requested.isSet()))
        
            
How in the hell can I get the following log output:

2009-02-24 11:42:14,696 INFO .feeder Got 5 items to process
2009-02-24 11:42:14,732 INFO .feeder Got 5 items to process
2009-02-24 11:42:14,733 INFO .feeder 15 (>10) items in the queue, waiting...
2009-02-24 11:42:15,740 INFO .feeder 15 (>10) items in the queue, waiting...
2009-02-24 11:42:16,965 ERROR .feeder Feeder stopped. stop_requested = False

It seems impossible to me. The while loop should only exit if 
stop_requested becomes set, OR if an exception is raised. However, all 
exceptions are cought and logged. But there are no exceptions logged. 
And stop_requested is NOT SET. (see the last line in the log).

What is happening here?


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 07:04:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 10:04:22 -0200
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
References: <49A3D881.4070500@shopzeus.com>
Message-ID: <op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 09:22:41 -0200, Laszlo Nagy <gandalf at shopzeus.com>  
escribi?:

> Given this class below:

[code removed]

> It seems impossible to me. The while loop should only exit if  
> stop_requested becomes set, OR if an exception is raised. However, all  
> exceptions are cought and logged. But there are no exceptions logged.  
> And stop_requested is NOT SET. (see the last line in the log).

I assume stop_requested is an Event object. Maybe other thread cleared it?

-- 
Gabriel Genellina



From gandalf at shopzeus.com  Tue Feb 24 07:25:26 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 13:25:26 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A3E736.2020702@shopzeus.com>


>
> I assume stop_requested is an Event object. Maybe other thread cleared 
> it?
>
It was never set! -> nothing can clear it.


From gandalf at shopzeus.com  Tue Feb 24 07:34:11 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 13:34:11 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <49A3E736.2020702@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com>
Message-ID: <49A3E943.3010405@shopzeus.com>


>>
>> I assume stop_requested is an Event object. Maybe other thread 
>> cleared it?
>>
> It was never set! -> nothing can clear it.
In theory, it could be that a thread sets the event object. E.g.:

#1. other thread calls stop_requested.set()
#2. "while not self.stop_requested.isSet()" -- loop exists
#3. other thread calls stop_requested.clear()
#4. called this: self.logger.error("Feeder stopped. stop_requested = 
%s",str(self.cm.stop_requested.isSet()))

However, this cannot happen. This application is running multiple 
threads (10+) and every thread monitors the global "stop_requested" 
flag. If there was an unexpected error in the service, 
stop_requested.set() is called. It will stop all threads and exit the 
process. stop_requested.clear() is NEVER called, so the while loop 
should have not been ended. So what is happening here? It drives me crazy.



From patrick.oloughlin at gmail.com  Tue Feb 24 07:41:30 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 24 Feb 2009 12:41:30 +0000
Subject: "Byte" type?
In-Reply-To: <49a36e1c$0$1586$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net> <gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
	<49a36e1c$0$1586$742ec2ed@news.sonic.net>
Message-ID: <cc34a9320902240441r72582fdfr93a29497a55909ef@mail.gmail.com>

2009/2/24 John Nagle <nagle at animats.com>:
> Martin v. L?wis wrote:
>>>>
>>>> Please don't call something dumb that you don't fully understand. It's
>>>> offenses the people who have spent lots of time developing Python --
>>>> personal, unpaid and voluntary time!
>
> ? Some of the people involved are on Google's payroll.

Uh, what does that have to do with anything?
It would only be relevant if you are saying that Google is paying them
to do the work (so not just "on their payroll").

More importantly, it's also only relevant if ALL the people
contributing are being paid by Google to do the work, which I'm pretty
sure is not the case.

There are people are spending lots of personal, unpaid and voluntary
time developing Python.

Paddy
-- 
"Ray, when someone asks you if you're a god, you say YES!"


From woodygar at sky.com  Tue Feb 24 07:54:28 2009
From: woodygar at sky.com (Gary Wood)
Date: Tue, 24 Feb 2009 12:54:28 -0000
Subject: Newby - is this what they are looking for ?? and is their a better a
	way
Message-ID: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>

''' program. 
1.What type of data will the input be? What type of data will the output be? 
2.Get the phrase from the user. 
3.Convert to upper case. 
4.Divide the phrase into words. 
5.Initialize a new empty list, letters. 
6.Get the first letter of each word. 
7.Append the first letter to the list letters. 
8.Join the letters together, with no space between them. 
9.Print the acronym.
Which of these steps is in a loop? What for statement controls this loop? '''

line = input('enter a phrase')
lines = line.upper()
seq = lines.split()
for i in seq:
    word = (i[0])
    print(word, end='')
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090224/6a600edb/attachment.html>

From clp2 at rebertia.com  Tue Feb 24 08:06:14 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 05:06:14 -0800
Subject: Newby - is this what they are looking for ?? and is their a 
	better a way
In-Reply-To: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
Message-ID: <50697b2c0902240506nffd6afana480585cdf744bdf@mail.gmail.com>

On Tue, Feb 24, 2009 at 4:54 AM, Gary Wood <woodygar at sky.com> wrote:
> ''' program.
> 1.What type of data will the input be? What type of data will the output be?
> 2.Get the phrase from the user.
> 3.Convert to upper case.
> 4.Divide the phrase into words.
> 5.Initialize a new empty list, letters.
> 6.Get the first letter of each word.
> 7.Append the first letter to the list letters.
> 8.Join the letters together, with no space between them.
> 9.Print the acronym.

You're not doing 5 or 7-9 right. Where's the `letters` list they asked for?

> Which of these steps is in a loop? What for statement controls this loop?
> '''
>
> line = input('enter a phrase')
> lines = line.upper()
> seq = lines.split()
> for i in seq:
> ??? word = (i[0])
> ??? print(word, end='')

Hint: `print` shouldn't be used inside the loop at all.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gandalf at shopzeus.com  Tue Feb 24 08:09:44 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 14:09:44 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
In-Reply-To: <49A3D881.4070500@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>
Message-ID: <49A3F198.4030208@shopzeus.com>


>
> It seems impossible to me. The while loop should only exit if 
> stop_requested becomes set, OR if an exception is raised. However, all 
> exceptions are cought and logged. But there are no exceptions logged. 
> And stop_requested is NOT SET. (see the last line in the log).
>
> What is happening here?

It was a bad assumption. Not all exceptions are subclasses of 
"Exception". In this case, an inner call raised SystemExit(0). So be 
aware. Don't think that this will catch all exceptions:

try:
    ???
except Exception,e:
   do_with(e)


Use this instead:

import sys
try:
    ???
except:
   e = sys.exc_value
   do_with(e)


Thanks,

   Laszlo



From steve at holdenweb.com  Tue Feb 24 08:17:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 08:17:28 -0500
Subject: How to read columns in python
In-Reply-To: <de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>	<50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
	<de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>
Message-ID: <go0s18$klf$1@ger.gmane.org>

Dhananjay wrote:
> Well,
> 
> The three columns are tab separated and there are 200 such rows having
> these 3 columns in the file.
> 
> First two columns are x and y coordinates and third column is the
> corresponding value.
> 
> I want to read this file as a matrix in which column1 correspond to
> row,  column2 corresponds to columns(in matrix) and column3 corresponds
> to value in the matrix.
> 
> 
> 
> -- Dhananjay
> 
> 
> 
> On Tue, Feb 24, 2009 at 12:18 PM, Chris Rebert <clp2 at rebertia.com
> <mailto:clp2 at rebertia.com>> wrote:
> 
>     On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay
>     <dhananjay.c.joshi at gmail.com <mailto:dhananjay.c.joshi at gmail.com>>
>     wrote:
>     > I am bit new to python and programming and this might be a basic
>     question:
>     >
>     > I have a file containing 3 columns.
> 
>     Your question is much too vague to answer. What defines a "column" for
>     you? Tab-separated, comma-separated, or something else altogether?
> 
Try something like

f = open("datafile.txt", 'r')
x = []; y = []; val = []
for line in f:
    xx, yy, vv = line.split()
    x.append(float(xx))
    y.append(float(yy))
    val.append(float(vv))

Of course this is only one way to represent the data - as vectors of x,
y and val. If you just wanted a list of the data triples then you could
have written

f = open("datafile.txt", 'r')
values = []
for line in f:
   x, y, v = line.split()
   values.append(float(x), float(y), float(v))

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From stefan_ml at behnel.de  Tue Feb 24 08:22:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 24 Feb 2009 14:22:25 +0100
Subject: Python C-API Object Allocation
In-Reply-To: <mailman.564.1235421673.11746.python-list@python.org>
References: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
	<mailman.564.1235421673.11746.python-list@python.org>
Message-ID: <49a3f491$0$30238$9b4e6d93@newsspool1.arcor-online.net>

> On Feb 21, 2009, at 10:01 AM, William Newbery wrote:
>> Ive been learning the C-API lately so I can write python extensions
>> for some of my c++ stuff.

First thing that comes to (my) mind is that you probably do not want to
write code against the bare C-API. Instead, give Cython a try.

http://cython.org

Stefan


From girish.cfc at gmail.com  Tue Feb 24 08:29:21 2009
From: girish.cfc at gmail.com (Girish)
Date: Tue, 24 Feb 2009 05:29:21 -0800 (PST)
Subject: Extract CDATA Node
Message-ID: <ba1ce25b-90a2-4670-a5c5-0370b0e9e09f@l37g2000vba.googlegroups.com>

How do I extract CDATA node in Python? I'm using dom.minidom as
follows:-

from xml.dom.minidom import Document

class XMLDocument():

    def __init__(self):
        self.doc  = Document()

    def parseString(self, d):
        self.doc = parseString(_encode(d))
        return self

#Create instance of XMLDocument
doc = XMLDocument()
doc.parseString(open(os.curdir + '\\XML\\1.xml', 'r').read())
.....

Please help me out.

Thanks,
Girish


From exarkun at divmod.com  Tue Feb 24 08:38:37 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 24 Feb 2009 08:38:37 -0500
Subject: Extract CDATA Node
In-Reply-To: <ba1ce25b-90a2-4670-a5c5-0370b0e9e09f@l37g2000vba.googlegroups.com>
Message-ID: <20090224133837.12853.1184111844.divmod.quotient.13470@henry.divmod.com>

On Tue, 24 Feb 2009 05:29:21 -0800 (PST), Girish <girish.cfc at gmail.com> wrote:
>How do I extract CDATA node in Python? I'm using dom.minidom as
>follows:-
>
>from xml.dom.minidom import Document
>
>class XMLDocument():
>
>    def __init__(self):
>        self.doc  = Document()
>
>    def parseString(self, d):
>        self.doc = parseString(_encode(d))
>        return self
>
>#Create instance of XMLDocument
>doc = XMLDocument()
>doc.parseString(open(os.curdir + '\\XML\\1.xml', 'r').read())
>.....
>
>Please help me out.

Here's one approach.

    from xml.dom.minidom import parse
    doc = parse(file('XML/1.xml'))
    cdata = []
    elements = [doc.documentElement]
    while elements:
        e = elements.pop(0)
        if e.nodeType == doc.TEXT_NODE:
            cdata.append(e.data)
        elif e.nodeType == doc.ELEMENT_NODE:
            elements[:0] = e.childNodes
    print cdata

I bet there are simpler ways, though, based on other XML libraries.

Jean-Paul


From steve at holdenweb.com  Tue Feb 24 09:06:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 09:06:05 -0500
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <49A3E943.3010405@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>	<49A3E736.2020702@shopzeus.com>
	<49A3E943.3010405@shopzeus.com>
Message-ID: <go0usd$vc0$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>>>
>>> I assume stop_requested is an Event object. Maybe other thread
>>> cleared it?
>>>
>> It was never set! -> nothing can clear it.
> In theory, it could be that a thread sets the event object. E.g.:
> 
> #1. other thread calls stop_requested.set()
> #2. "while not self.stop_requested.isSet()" -- loop exists
> #3. other thread calls stop_requested.clear()
> #4. called this: self.logger.error("Feeder stopped. stop_requested =
> %s",str(self.cm.stop_requested.isSet()))
> 
> However, this cannot happen. This application is running multiple
> threads (10+) and every thread monitors the global "stop_requested"
> flag. If there was an unexpected error in the service,
> stop_requested.set() is called. It will stop all threads and exit the
> process. stop_requested.clear() is NEVER called, so the while loop
> should have not been ended. So what is happening here? It drives me crazy.
> 
Time to get a stuffed toy and go through your code, explaining to the
toy exactly why your code is right and nothing can go wrong. With luck,
within half an hour you will realize what you are doing wrong ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From digitig at gmail.com  Tue Feb 24 09:19:56 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 14:19:56 +0000
Subject: Reference or Value?
In-Reply-To: <01b3c619$0$23707$c3e8da3@news.astraweb.com>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<mailman.647.1235465046.11746.python-list@python.org>
	<01b3c619$0$23707$c3e8da3@news.astraweb.com>
Message-ID: <aee48b3c0902240619tc3d75cbof7047125060e7f04@mail.gmail.com>

2009/2/24 Steven D'Aprano <steve at pearwood.info>:

> If you look at this Wikipedia page:
>
> http://en.wikipedia.org/wiki/Evaluation_strategy
>
> you should be able to count no fewer than thirteen different terms for
> different evaluation strategies, and "call-by-value" itself is described as
> a family of strategies.

And that call by sharing is a member of that family even though the
behaviour is (as I understand it) exactly what you would get if you
pass an object by ^reference^ in C++. Wikipedia can be a double-edged
sword ;-).

I think the problem is that "Call by value" and "Call by reference"
are terms that pre-date object orientation, and don't cope well with
obect-oriented languages in general, not just with Python. That Java
programmers get by thinking the mechanism is called "call by value",
C++ programmers get by thinking the same mechanism is called "call by
reference" and Python programmers get by thinking the same mechanism
is called "call by sharing" suggests that the terms are no longer
helpful. Programmers in one language simply can't know what the
terminology means when applied to another language without learning
the behaviour in that other language before learning the terminology.

That means that Torsten's original question probably wasn't the one he
wanted to ask, and wasn't a useful one. The useful question is "what
is Python's parameter passing *behaviour^",
with a possible supplementary "what do they call that behaviour *in
the Python community*", recognising that if they asked "what is Java's
parameter passing *behaviour^",
with the supplementary "what do they call that behaviour *in the Java
community*" they would get much the same answer for the first question
(immutability is handled differently, I think, but it's there) but a
totally different answer to the second.

-- 
Tim Rowe


From bnsilinux at gmail.com  Tue Feb 24 09:20:48 2009
From: bnsilinux at gmail.com (Ben)
Date: Tue, 24 Feb 2009 06:20:48 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
Message-ID: <7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>

On Feb 23, 2:31?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?In My S-Lag Project called, SLAG, I have some function keys that get
> > ?mapped back to S-lang internal functions.
>
> > ?My SLAG project works pretty much like Python (as does the S-Lang).
> > ?You write a S-lang script
> > ?that "imports" your extension. module - and all this gets run by the
> > ?shell/interpreter.
>
> > ?I allow function keys to be mapped back internal function(s) inside of
> > ?the controlling program.
>
> > ?My question is which Python C api Do I need to this with ?
>
> Do you mean like this?
>
> ?http://code.google.com/p/python-slang
>
> Not sure how well maintained it is though.
>
> > Do I need to worry about my reference counting since the Python
> > Program is in essence calling a function in itself?
>
> I'm not sure I understand you here, but in general you don't need to
> worry about reference counting in Python - it all happens behind the
> scenes. ?If you are writing a python extension in C then you do need
> to worry about reference counting - a lot!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

No, It uses the the S-lang for video, and input control. However, SLAG
is more of an abstract layer on top of that.

It has a Structures that contains menus and screens (menumodule /
screenmodule). One LOADS them up with parameters.
such as creating a new menu is like:

OpenMenu( Company name, SubSystem, this program name, mode, bottom
status display)   - Create initial menu structure
Addtomenu(Menu Block Set name, DISPLAY line, ID, type of program,
password ID )  - add to / update MENU blocks.
runMenu()   - Displays the whole create menu structure.

The Menu structure is done in pull downs and scrollable blocks in a
TUI (text User Interface) and using the
S-lang screen library is fully mouseable.

The screen module works mych the same way, but with the abiltity to
open and close and
work within "Sub Screens".


For those who do not know, S-lang is a interpreted language much like
Python. However, there
is s direth of library modules. The original S-lang started out as
library of screen of keyboard
modules, but has been expanded

My SLAG project does not care in reality WHICH or what language, it is
simply handling menu and
screen control.

Hope this helps ...


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 09:25:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 12:25:50 -0200
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
	<73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>
Message-ID: <op.upu01cwmx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 05:51:27 -0200, Kom2 <kom2 at centrum.cz> escribi?:

> On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
>> Kom2 wrote:
>> > Hello,
>> > I'm trying to convert my project from python 2.5 to python 3.0 and I
>> > have the following problem. My project is PYD library written in C++.
>> > So I have this PyInit_ModuleName function containing PyModule_Create
>> > call and this function also call some script with declarations:
>>
>> > ? ?PyObject* m;
>>
>> > ? ?m = PyModule_Create(&PyVRDAModule);
>> > ? ?if (m == NULL) {
>> > ? ? ? return NULL;
>> > ? ?}
>> > ? ?PyObject *d, *v;
>> > ? ?d = PyModule_GetDict(m);
>> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
>> > d, NULL);
>> > ? ?......
>>
>> > txtPyPredefinedConstants is string with this content:
>>
>> > class CursorMoveType:
>> > ? ?First = 0
>> > ? ?Last = 1
>> > ? ?Next = 2
>> > ? ?Previous = 3
>> > ? ?Bookmark = 4
>> > ? ?NewRecord = 5
>>
>> > In Python 2.5 everything works fine, now in python3.0
>> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
>> > found".

__build_class__ is a (hidden?) function in the builtins module.
Your module isn't completely created yet, it lacks the __builtins__  
attribute, so you can't execute any Python code that calls a builtin  
function. In 2.5 the class statement was a lot simpler, but in 3.0 it  
requires an auxiliary function (implemented as builtins.__build_class__)
You may try setting __builtins__ to the current builtins  
(PyEval_GetBuiltins) before executing Python code.
Or, if those 7 lines are all you need, you may just write the equivalent C  
code.

-- 
Gabriel Genellina



From chrysn at fsfe.org  Tue Feb 24 09:27:19 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Tue, 24 Feb 2009 15:27:19 +0100
Subject: variables bound in moudules are None when module is not completely
	imported
Message-ID: <20090224142719.GA27379@hephaistos.amsuess.com>

when a module being loaded is interrupted by an exception, code blocks
that have the module's scope in their environment will later evaluate
variables bound to that module to None, instead of preserving that scope
(because it is still referenced somewhere) or raising a NameError (for
which i see no reason, but which would still be better than silently
returning None).

this can happen, for example, when one tries to join different programs
in one main loop by having the modules first hook up to events and then
terminating the subprograms by replacing the call to the main loop with
an exception raiser.

attached, there is a tarball with two similar examples, one
demonstrating that with functions instead of modules (this behaves as
expected; ./function/), the other showing that when a module's block is
terminated, the remaining variables are set to None (./module/); both
can be run by calling `python main.py` in the respective directory.

* is this a bug in the pythin implementation? (i've tested it both with
  2.5 and with 3.0b2)
* if yes, is it identical to [1748015]? (i suppose it is, but lacking
  experience with pdb i am not sure)
* can / will this be fixed?
* is there a workaround?
    * especially, is there a workaround that works w/o rewriting the
      modules that raise the exceptions? (otherwise, wrapping all the
      stuff called in the __name__=="__main__" wrapper into a main()
      function and then calling that would trivially solve that)

answers to any of these questions would be very much appreciated

regards
chrysn

[1748015] http://bugs.python.org/issue1748015

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From gagsl-py2 at yahoo.com.ar  Tue Feb 24 09:52:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 12:52:14 -0200
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
References: <49A3D881.4070500@shopzeus.com> <49A3F198.4030208@shopzeus.com>
Message-ID: <op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 11:09:44 -0200, Laszlo Nagy <gandalf at shopzeus.com>  
escribi?:

>> It seems impossible to me. The while loop should only exit if  
>> stop_requested becomes set, OR if an exception is raised. However, all  
>> exceptions are cought and logged. But there are no exceptions logged.  
>> And stop_requested is NOT SET. (see the last line in the log).
>>
>> What is happening here?
>
> It was a bad assumption. Not all exceptions are subclasses of  
> "Exception". In this case, an inner call raised SystemExit(0).

Glad to see you finally found what was happening!

> So be aware. Don't think that this will catch all exceptions:
>
> try:
>     ???
> except Exception,e:
>    do_with(e)
>
>
> Use this instead:
>
> import sys
> try:
>     ???
> except:
>    e = sys.exc_value
>    do_with(e)

Only at the outermost block on your code, if ever... The fact that some  
exceptions don't inherit from Exception is on purpose -- usually you  
*dont* want to catch (and swallow) SystemExit (nor KeyboardInterrupt, and  
a few more I think)

-- 
Gabriel Genellina



From gabriel.rossetti at arimaz.com  Tue Feb 24 09:56:59 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 24 Feb 2009 15:56:59 +0100
Subject: shared lib from python code?
In-Reply-To: <89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
References: <49A27608.3050403@arimaz.com> <49A28BD6.9040701@arimaz.com>
	<89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
Message-ID: <49A40ABB.6090502@arimaz.com>

andrew cooke wrote:
> Gabriel Rossetti wrote:
>   
>> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I
>> don' t want to share code as in have multiple processes access a
>> variable and have the same value, like it is done in threads, what I
>> want is to not have n copies of the code (classes, functions, etc)
>> loaded by n python interpreters. When you load Apache for instance, it
>> runs n processes but loads only one copy of parts of it's code (so/dll),
>> that's what I want to do. In C/C++ I would write a shared-lib (so/dll),
>> so once the system has loaded it, it doesn' t re-load it when another
>> process needs it.
>>     
>
> i think i understand what you want.  the problem is that the kind of
> language that python is really doesn't work well with that kind of
> approach.  this is (and i may be wrong - i've not really thought much
> about this before) largely because python places a very strong emphasis on
> late binding.  that means that everything is very flexible - all kinds of
> things can be changed "under the hood".  and that means that it is very
> difficult to share things safely because almost any solution would end up
> doing what you don't want (sharing variables, like with threads (even
> though they are very deeply buried variables)) rather than what you do
> want (just sharing the static part of the code to save space).
>
> another way to see this is to see the connection with security.  this is
> the flip side of your case - because things are so flexible it is very
> hard to run some python code in a "sandbox" in a larger python program. 
> there's some discussion on the dev group at the moment and it looks like
> the solution is to only use function closures.  but even that doesn't work
> without some patches that remove certain ways to dynamically alter the
> code base.
>
> andrew
>
>   
Ok, I see, thank you. I thought this was possible since I have used 
*.pyd files before and from what I had read they were dynamic library 
files. I guess they must be written in C/C++ then. Thank you for the 
explanation.

Gabriel


From gabriel.rossetti at arimaz.com  Tue Feb 24 09:58:54 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 24 Feb 2009 15:58:54 +0100
Subject: shared lib from python code?
In-Reply-To: <Xns9BBB84727E289duncanbooth@127.0.0.1>
References: <49A27608.3050403@arimaz.com>	<mailman.514.1235389443.11746.python-list@python.org>
	<Xns9BBB84727E289duncanbooth@127.0.0.1>
Message-ID: <49A40B2E.2010601@arimaz.com>

Duncan Booth wrote:
> Gabriel Rossetti <gabriel.rossetti at arimaz.com> wrote:
>
>   
>> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
>> don' t want to share code as in have multiple processes access a 
>> variable and have the same value, like it is done in threads, what I 
>> want is to not have n copies of the code (classes, functions, etc) 
>> loaded by n python interpreters. When you load Apache for instance, it 
>> runs n processes but loads only one copy of parts of it's code (so/dll), 
>> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
>> so once the system has loaded it, it doesn' t re-load it when another 
>> process needs it.
>>
>>     
>
> It doesn't matter how you restate it, the answer is still the one Gabriel 
> Genellina gave you: Python code objects are not shared between processes.
>
>   
Ok, I had though that he had misunderstood me.
> Code objects are immutable, but they are still objects like everything else 
> in Python. That means they are reference counted and discarded when no 
> longer referenced.
>
> To share code objects between different processes you would have to change 
> the reference counting mechanism so it was either safe across multiple 
> processes or didn't reference count shared code objects (but still ref 
> counted non-shared objects).
>
> The actual code is just stored in a string, so perhaps you could share 
> those strings between processes: just executing the code doesn't change the 
> string's refcount (whereas it does change the function and the code 
> objects' counts). You could probably make something work simply by editing 
> the code constructor to move the code into shared memory and using some 
> other mechanism to control the shared memory storage.
>
>   
Ok, thanks for the explanation.
> C extension libraries on the other hand may be shared.
>
>   
Ok, so pyd files must be C extensions then.

Thanks


From nick_keighley_nospam at hotmail.com  Tue Feb 24 10:00:41 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Tue, 24 Feb 2009 07:00:41 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
Message-ID: <ea052d08-0621-4281-ad47-f6705f7e289d@f24g2000vbf.googlegroups.com>

On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:
> comp.lang.lisp,comp.lang.scheme,comp.lang.functional,comp.lang.python,comp.?lang.ruby
>
> Here's a interesting toy problem posted by Drew Krause to
> comp.lang.lisp:
>
> ------------------------
> On Jan 16, 2:29 pm, Drew Krause wrote [paraphrased a bit]:
>
> OK, I want to create a nested list in Lisp (always of only integers)
> from a text file, such that each line in the text file would be
> represented as a sublist in the 'imported' list.
>
> example of a file's content
>
> 3 10 2
> 4 1
> 11 18
>
> example of programing behavior
> (make-list-from-text "blob.txt") => ((3 10 2) (4 1) (11 18))
>
> -----------------
> Here's a emacs lisp version:
>
> (defun read-lines (file)
>   "Return a list of lines in FILE."
>   (with-temp-buffer
>     (insert-file-contents file)
>     (split-string
>      (buffer-substring-no-properties 1 (point-max)) "\n" t)
>     )
>   )
>
> (defvar mylist '() "result list" )
> (setq mylist '()) ; init in case eval'd again
>
> (mapc
>  (lambda (x) (setq mylist
>                    (cons (split-string x " ") mylist )) )
>  (read-lines "xxblob.txt")
>  )
>
> The above coding style is a typical maintainable elisp.
>
> In a show-off context, it can be reduced to by about 50%, but still
> far verbose than ruby or say perl (which is 1 or 2 lines. (python
> would be 3 or 5)).
>
> Note that the result element is string, not numbers. There's no easy
> way to convert them on the fly. 3 or so more lines will be needed to
> do that.
>
> The ?read-lines? function really should be a built-in part of elisp.
> It is not so mostly because emacs people have drawn themselves into a
> elitist corner, closing off to the outside world. (i am sending a
> suggestion to the official emacs dev list on adding read-line now.)

scheme:

(define (read-line port)
    (define (rec-read-line port line)
        (define next-char (peek-char port))
        (define number #f)
        (cond ((eof-object? next-char) '())
              ((char=? next-char #\newline) (read-char port) line)
              ((char-numeric? next-char)
                   (set! number (read port))
                   (cons number (rec-read-line port line)))
              ((char=? next-char #\space)
                   (read-char port)
                   (rec-read-line port line))
              (else (error (string-append "bad character \""
                              (string next-char) "\"")))
    ))

    (rec-read-line port '())
)

(define (make-int-list port)
    (define line (read-line port))
    (if (null? line)
        '()
        (cons line (make-int-list port))))

(define (make-list-from-text file)
    (make-int-list (open-input-file file)))



> -----------------
>
> w_a_x_... at yahoo.com gave a ruby solution:
>
>   IO.readlines("blob.txt").map{|line| line.split }
>
> augumented by Jilliam James for result to be numbers:
>
>   IO.readlines("blob.txt").map{|line| line.split.map{|s| s.to_i }}
>
> Very beautiful.
>
> -------------------
>
> That's really the beauty of Ruby.
>
> This problem and ruby code illustrates 2 fundamental problems of lisp,
> namely, the cons problem, and the nested syntax pain. Both of which
> are practically unfixable.
>
> The lisp's cons fundamentally makes nested list a pain to work with.
> Lisp's nested syntax makes functional sequencing cumbersome.
>
> In the ruby code, its post-fix sequential notation (as a side effect
> of its OOP notation) brings out the beauty of functional sequencing
> paradigm (sometimes known as functional chain, sequencing, filtering,
> unix piping).
>
> its list, like all modern high level langs such as perl, php, python,
> javascript, don't have the lisp's cons problem. The cons destroys the
> usability of lists up-front, untill you have some at least 2 full-time
> years of coding lisp to utilize cons properly. (and even after that,
> it is still a pain to work with, and all you gain is a bit of speed
> optimization in rare cases that requires largish data, most of which
> has better solutions such as a database.)
>
> Both of these problems i've published articles on.
>
> For more detail on the cons problem, see
> the section ?The Cons Business? at
>
> ? Fundamental Problems of Lisp
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
>
> For more detail on the nested syntax problem for function chaining,
> see
> the section ?How Purely Nested Notation Limits The Language's Utility?
> at:
>
> ? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
> Nested Notations
>  http://xahlee.org/UnixResource_dir/writ/notations.html


From digitig at gmail.com  Tue Feb 24 10:11:46 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 15:11:46 +0000
Subject: Newby - is this what they are looking for ?? and is their a 
	better a way
In-Reply-To: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
Message-ID: <aee48b3c0902240711g552bb50bp9d34ae178ce1ab94@mail.gmail.com>

You're doing well so far. As Chris has said, you need to read the
later part of the question more carefully. A couple of other things:

1. 'input' might not be the best way to get the phrase, because the
user will have to put the phrase in quotes or the program will
(probably) crash. Have a look at raw_input.

2. A cosmetic thing. Your users will be happier if you put a space
after 'enter a phrase'

3. A "better way" might not be a better way for you. There's a very
Pythonic way of doing this using something called list comprehensions,
but they're almost certainly not what your tutor wants because they're
rather more advanced than the level you're working at. If it wasn't
for the requirement to put the acronym into the variable "letters",
the whole task could be done in one Python statement. Don't try that.
Keep it simple, the way you have been so far.

4. If you want to be a wise guy, ask your tutor why he/she got you to
convert the whole phrase to upper case, wasting a whole pile of
character conversion operations under the hood, because it's only the
acronym that needs to be converted :-)

-- 
Tim Rowe


From tracyde at gmail.com  Tue Feb 24 10:19:07 2009
From: tracyde at gmail.com (Derek Tracy)
Date: Tue, 24 Feb 2009 10:19:07 -0500
Subject: Unix Change Passwd Python CGI
Message-ID: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>

I am using python version 2.5.1 and need to create a python cgi application
to allow a user to change their unix password.

Apache is running on the same system that needs the password changed.  I
need to keep security high and can not install additional modules at this
time.

I just need a general direction to start looking, and I do not have expect
installed on the system.

Any ideas would be wonderful!

R/S --
---------------------------------
Derek Tracy
tracyde at gmail.com
---------------------------------
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From invalid at invalid  Tue Feb 24 10:38:11 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 24 Feb 2009 09:38:11 -0600
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com> <49A3E943.3010405@shopzeus.com>
	<mailman.664.1235484376.11746.python-list@python.org>
Message-ID: <6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>

On 2009-02-24, Steve Holden <steve at holdenweb.com> wrote:

>> However, this cannot happen. This application is running
>> multiple threads (10+) and every thread monitors the global
>> "stop_requested" flag. If there was an unexpected error in the
>> service, stop_requested.set() is called. It will stop all
>> threads and exit the process. stop_requested.clear() is NEVER
>> called, so the while loop should have not been ended. So what
>> is happening here? It drives me crazy.
>
> Time to get a stuffed toy and go through your code, explaining
> to the toy exactly why your code is right and nothing can go
> wrong. With luck, within half an hour you will realize what
> you are doing wrong ...

It works with a person as well as stuffed toys -- but trying to
order a person on the internet gets you in a lot more trouble.
It's also a little more embarassing when you realize your
mistake in front of a person.  OTOH, sometimes a person will
ask an enlightening question; but, sometimes they just make
unhelpfull wisecracks.  It's a tough choice.

-- 
Grant Edwards                   grante             Yow! OVER the underpass!
                                  at               UNDER the overpass!
                               visi.com            Around the FUTURE and
                                                   BEYOND REPAIR!!


From gandalf at shopzeus.com  Tue Feb 24 10:45:13 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 16:45:13 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
In-Reply-To: <op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>
References: <49A3D881.4070500@shopzeus.com> <49A3F198.4030208@shopzeus.com>
	<op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A41609.6090904@shopzeus.com>


>>
>> Use this instead:
>>
>> import sys
>> try:
>>     ???
>> except:
>>    e = sys.exc_value
>>    do_with(e)
>
> Only at the outermost block on your code, if ever... The fact that 
> some exceptions don't inherit from Exception is on purpose -- usually 
> you *dont* want to catch (and swallow) SystemExit (nor 
> KeyboardInterrupt, and a few more I think)
>

Yes, this was at the outermost block of my thread's run method.

SystemExit exception did not generate an "exception in Thread-32" type 
traceback on stderr because for Python, it seemed to be a "normal" exit 
of the thread. So I wrote an except block, to see why the thread has 
been stopping. In this case, catching SystemExit was desired. The 
problem was in my mind: I thought that "except Exception,e:" will catch 
everything.

The solution was to replace "raise SystemExit(0)" with "raise 
TransportClosedException()" in another class.

Thanks again,

   Laszlo



From __peter__ at web.de  Tue Feb 24 10:50:17 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 24 Feb 2009 16:50:17 +0100
Subject: Newby - is this what they are looking for ?? and is their a
	better a way
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
	<mailman.671.1235488311.11746.python-list@python.org>
Message-ID: <go14vo$ptv$02$1@news.t-online.com>

Tim Rowe wrote:

> 1. 'input' might not be the best way to get the phrase, because the
> user will have to put the phrase in quotes or the program will
> (probably) crash. Have a look at raw_input.

Gary is using Python 3 where input() works like the raw_input() of yore.
The giveaway is

> print(word, end='')

Peter


From R.Brodie at rl.ac.uk  Tue Feb 24 11:04:54 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Tue, 24 Feb 2009 16:04:54 -0000
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com><gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com><gnv6vs$bm7$1@ger.gmane.org>
	<mailman.615.1235436896.11746.python-list@python.org>
Message-ID: <go15r7$3fp$1@south.jnrs.ja.net>


"Rhodri James" <rhodri at wildebst.demon.co.uk> wrote in message 
news:mailman.615.1235436896.11746.python-list at python.org...

> A souq is a bazaar :-)

> Maybe I've just read too much arabic-themed fiction, but I was surprised not
> to find the word in my trusty Chambers.

Try under 'souk'. Transliterating to the Roman 'q' seems to have become
popular relatively recently. 




From kyosohma at gmail.com  Tue Feb 24 11:05:06 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 24 Feb 2009 08:05:06 -0800 (PST)
Subject: March 2, 2009 Pyowa Meeting
Message-ID: <02f0bb8f-4357-43ea-8f32-da3835ea3c43@f11g2000vbf.googlegroups.com>

Hi,

Just a quick note to say that our next Pyowa (Python Users Group of
Iowa) meeting will be next Monday, March 2nd from 7-9 p.m. We will be
in our original location at the Marshall County Sheriff's Office, 2369
Jessup Ave, Marshalltown, IA. Remember, it's technically NOT in
Marshalltown at all. It's actually about 7 miles to the West of
Marshalltown. Keep an eye on our website (www.pyowa.org) for updates
and/or cancellations should the weather turn bad.

We are currently going to have a presentation featuring real-life
programs/scripts to give our members an idea of what Python is used
for on a day-to-day basis. We'll probably open it up to the audience
to see if they have anything to add. We are also hoping to have a
presentation on some basic GIS scripts, but this is rather tentative.
Regardless, there will be free drinks provided (pop / water).

Let me know if you can make it!

Mike


From kraranke at gmail.com  Tue Feb 24 11:42:47 2009
From: kraranke at gmail.com (kshitij)
Date: Tue, 24 Feb 2009 08:42:47 -0800 (PST)
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
References: <E306DE3F7B904BF094575153877180B6@Woodygar>
	<mailman.619.1235438967.11746.python-list@python.org>
Message-ID: <998cde7c-07ab-4400-b36e-904640e1c2a1@e24g2000vbe.googlegroups.com>

On Feb 24, 6:29?am, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Mon, 23 Feb 2009 23:33:31 -0000, Gary Wood <woody... at sky.com> wrote:
> > '''exercise to complete and test this function'''
> > import string
> > def joinStrings(items):
> > ? ? '''Join all the strings in stringList into one string,
> > ? ? and return the result. For example:
> > ? ? >>> print joinStrings(['very', 'hot', 'day'])
> > ? ? 'veryhotday'
> > ? ? '''
> > ? ? for i in items:
> > ? ? ? ?return (''.join(items))
>
> As I'm sure your teacher will point out, this is sub-optimal :-)
> That for-loop isn't doing anything, because you always return
> out of it at the first iteration.
>
> I suspect that you're expected to concatenate the strings
> together by hand and return the resulting string once you've
> done them all. ?Trying writing it that way.
>
> PS: it helps a lot if what you say in the doc string matches
> what you write in the rest of the code. ?In this case you
> call your input string "items", but then say "Join all the
> strings in *stringList*..."
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Here is another way of doing this:

print ('very' + 'hot' + 'day')

Hope this helps.


From see.signature at no.spam  Tue Feb 24 11:52:42 2009
From: see.signature at no.spam (Eric Brunel)
Date: Tue, 24 Feb 2009 17:52:42 +0100
Subject: tkinter icons as bytestrings, not files?
References: <slrngq6vfd.2u7.peter@box8.pjb.com.au>
Message-ID: <op.upu7t4xtwepdt4@ericb.pragmadev>

On Tue, 24 Feb 2009 05:56:12 +0100, Peter Billam <peter at www.pjb.com.au>  
wrote:

> Greetings,
>
> As a newbie, starting with Python3, I'm working my way through Mark
> Summerfield's tkinter examples.  In the toolbar, there's lines like:
>     for image, command in (
>         ('images/filenew.gif',  self.fileNew),
>         ('images/fileopen.gif', self.fileOpen),
>         ('images/filesave.gif', self.fileSave),
>         ('images/editadd.gif',  self.editAdd),
>         ('images/editedit.gif', self.editEdit),
>         ('images/editdelete.gif', self.editDelete),):
>     image = os.path.join(os.path.dirname(__file__), image)
>     image = tkinter.PhotoImage(file=image)
>     self.toolbar_images.append(image)
>     button = tkinter.Button(toolbar, image=image, command=command)
>     button.grid(row=0, column=len(self.toolbar_images) -1)
>
> which are always failing because the icons are in the wrong place
> and I can't help but wonder if I can put all these little images
> in the application itself, either as b'whatever' or uuencoded or
> in svg etc, and then invoke some suitable variation of the
>     image = tkinter.PhotoImage(file=image)
> or of the
>     button = tkinter.Button(toolbar, image=image, command=command)
> command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
> magic key (unless it's "data=something, format=something")) ...

Just dump the contents of the file as a bytestring and use:
image = PhotoImage(data=the_byte_string)
With no extension, I guess it'll only work with GIF files, as it is the  
only natively supported image format in tcl/tk (AFAIK...).

HTH
-- 
python -c "print ''.join([chr(154 - ord(c)) for c in  
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])"


From adleslie at gmail.com  Tue Feb 24 12:27:31 2009
From: adleslie at gmail.com (May)
Date: Tue, 24 Feb 2009 09:27:31 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
Message-ID: <fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>

On Feb 23, 12:48?pm, Bruno Desthuilliers
<bdesth.quelquech... at free.quelquepart.fr> wrote:
> May a ?crit :
> (snip)
>
> > I may not stay with Django.
>
> Nope, but your question was about Django.
>
> > I am seriously looking for whether python
> > can read data from a relational database
>
> Of course - as long as there's a Python adapter for your DB.
>
> > and send to an html template
>
> Of course - as long as it's either a Python templating system or there's
> a Python binding for this system.
>
> > or do I always need some kind of wrapper/interface such as Rails
>
> Uh ? Rails is a Ruby framework.
>
> > or
> > Django? ?
>
> No, you don't. If you prefer to reinvent the wheel on each and any part
> of each an any web app you write, please feel free to do so.
>
> > If this is the wrong group to ask that question
>
> Which "that" question ?-)
>
> For question related to Django's ORM, the django group is indeed a
> better place (as usual: always use the most specific group / maling list
> / whatever first). If you have questions (like the above) that are about
> Python itself, you're at the right place.

Thanks for all your suggestions.  From what I've experienced in Django
and now that I know a little more about how Python functions, I will
probably use a combination of PHP and Django, instead of trying to get
Python to do the web portion of my project.  Thanks again!


From nick at craig-wood.com  Tue Feb 24 12:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 24 Feb 2009 11:31:53 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
Message-ID: <slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  No, It uses the the S-lang for video, and input control. However, SLAG
>  is more of an abstract layer on top of that.
> 
>  It has a Structures that contains menus and screens (menumodule /
>  screenmodule). One LOADS them up with parameters.  such as creating
>  a new menu is like:
> 
>  OpenMenu( Company name, SubSystem, this program name, mode, bottom
>  status display) - Create initial menu structure Addtomenu(Menu
>  Block Set name, DISPLAY line, ID, type of program, password ID ) -
>  add to / update MENU blocks.  runMenu() - Displays the whole create
>  menu structure.
> 
>  The Menu structure is done in pull downs and scrollable blocks in a
>  TUI (text User Interface) and using the S-lang screen library is
>  fully mouseable.
> 
>  The screen module works mych the same way, but with the abiltity to
>  open and close and work within "Sub Screens".
> 
>  For those who do not know, S-lang is a interpreted language much
>  like Python. However, there is s direth of library modules. The
>  original S-lang started out as library of screen of keyboard
>  modules, but has been expanded
> 
>  My SLAG project does not care in reality WHICH or what language, it
>  is simply handling menu and screen control.

So do you want to embed python into your code?

I'm still not clear what you are trying to achieve with python, though
I have a better idea what SLAG is now!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From traversos at gmail.com  Tue Feb 24 12:34:59 2009
From: traversos at gmail.com (Dario Traverso)
Date: Tue, 24 Feb 2009 12:34:59 -0500
Subject: Python Image Library IOError - cannot find JPEG decoder?
Message-ID: <8117677E-D022-41A3-A730-8AD76AE0F2A3@gmail.com>

I've been trying to install the Python Image Library  (PIL) on my Mac  
OSX Leopard laptop, but have been running into some difficulties.

I've built the library, using the included setup.py  script. The build  
summary checks out ok, and sounds the option libraries to all be  
found. I grabbed both libjpeg and freetype2  using  fink.

--------------------------------------------------------------------
PIL 1.1.6 BUILD SUMMARY
--------------------------------------------------------------------
version       1.1.6
platform      darwin 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
              [GCC 4.0.1 (Apple Inc. build 5465)]
--------------------------------------------------------------------
--- TKINTER support ok
--- JPEG support ok
--- ZLIB (PNG/ZIP) support ok
--- FREETYPE2 support ok
--------------------------------------------------------------------

However,  I then run the included self test, and 1 out of 57 tests  
fails. I receive an IOError. Specifically:

*****************************************************************
Failure in example: _info(Image.open("Images/lena.jpg"))
from line #24 of selftest.testimage
Exception raised:
Traceback (most recent call last):
  File "./doctest.py", line 499, in _run_examples_inner
    exec compile(source, "<string>", "single") in globs
  File "<string>", line 1, in <module>
  File "./selftest.py", line 22, in _info
    im.load()
  File "PIL/ImageFile.py", line 180, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available
1 items had failures:
   1 of  57 in selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.


I've followed all of the installation instructions exactly. The build  
summary reported everything was "ok". What could be the problem here.   
Libjpeg-6b  is not accessible?

Thank you for any insight you can provide!!

-Dario


From paul at boddie.org.uk  Tue Feb 24 12:39:44 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 24 Feb 2009 09:39:44 -0800 (PST)
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
Message-ID: <2ed478dd-0c85-4dc4-befe-478974669821@u1g2000vbb.googlegroups.com>

On 22 Feb, 12:24, Marcel Luethi <marcel.lue... at gmail.com> wrote:
>
> Using my iPhone I suddenly realize how easy it is to find applications
> in Apple's AppStore. How easy and fast it is to install or de-install
> an app. My iPhone even checks in the background if there is an upgrade
> which could be installed painlessly.

Yes, but this is just one platform. Can you download these iPhone
applications onto Android devices and use them? How would you package
your Objective-C (or whatever Apple has mandated) software for Android
or Debian or anything else out there?

> Then I see VMware's Virtual Appliance Marketplace, where you can
> download already pre-configured "appliances" for all kind of stuff.
> You can even download a basic appliance, install and configure your
> servers and tools - and upload it again, so that others can profit of
> your work.
>
> Unfortunately there's nothing like this in the Python world...

That's because you first wrote about platform-specific packaging and
now you're writing about language-specific packaging. And it's not as
if the former area hasn't been well addressed by Free Software,
either, but I suppose that's another discussion to be had.

> My idea: what about having a beefed up Cheeseshop for Python apps and
> an accompanying client app kind of iTunes for Python apps?
>
> The server side could be easily implemented with any of the current
> web frameworks. It's simply a management platform for the app packages
> (descriptions, versions, platforms, licenses, user's comments, number
> of downloads, ...) and the package files themselves.
> It should be definitely hosted by the PSF I think.

Well, what you're proposing risks exactly the same problems that many
other language-specific packaging solutions suffer from: it starts off
with specifying platforms, dependencies (which you didn't mention),
download files, and ends up with the user downloading huge amounts of
stuff that may already be on their system, mostly because such
solutions assume that the system doesn't really know anything about
what's already installed. Consequences of this may include a lack of
decent system-related tools to manage the result of installing stuff:
it would be like your iPhone application being installable on Android
by being dumped into the filesystem with little regard for existing
content and with no obvious strategy for safely removing the
application later.

It's true that there are other application repositories similar to the
VMware service you mention which don't really care about dependencies
and just offer self-contained applications for reasons of catering to
the lowest common denominator, and perhaps there's a desire to have
such services out there, but then again, doing such stuff specifically
for Python will lead you into making self-contained applications using
those "installer" technologies, or at least mapping and providing non-
Python library dependencies across multiple platforms. Or you could
just make it easier for Python projects to provide self-contained
applications based on VMware or Free Software alternatives - at least
that would allow you to focus on one platform, although the result
wouldn't be regarded as a "fully integrated" cross-platform approach
because a virtual machine would be involved.

> The multi-platform client should be intuitively and elegantly allow
> app browsing, downloading and installing those Python apps. In that
> respect it is sort of a Linux package manager (Synaptic, YUM, ...).

Why wouldn't you make use of existing system package management, then?

> But this is only the end-user related stuff. Furthermore it should
> allow to create new apps (probably based on a previously downloaded
> base app), package and upload them again (kind of Google AppEngine
> Launcher). Those base packages should include some basic management
> framework (for installation and configuration) and hopefully soon
> after the release of this platform they will be created in a broad
> variety to allow app developers to choose among many Python-version/
> platform/GUI/...-combinations.

Well, system packages of Python software typically make some use of
distutils to put files in the right places before bundling those files
together. The resulting system packages then work within a "basic
management framework", although I accept that there typically isn't
much support for trivial repackaging, although it isn't that difficult
to repackage, say, a Debian package and to publish it in your own
repository.

> IMHO an architecture like this would greatly enhance the productivity
> of the whole Python community by capitalizing the knowledge of many
> Python specialists. I don't have to find/install/configure all the
> basic stuff myself (see above) to build my app. But I can concentrate
> on my app because I'm standing on the shoulders of giants.

It isn't hard to find/install/configure the basic stuff in most GNU/
Linux distributions, either.

> I believe it also would make Python as a great platform more visible
> to the world - because there is only one place you have to go...
>
> What do you think???
> Is this crazy??? Or simply stupid?
> Or is this the way to world domination...? ;-)

Some people - usually Windows users - seem to like the idea of a
Python-specific solution, whereas others look to be able to administer
packages of many different kinds of software on their own system, and
in some environments people look to be able to administer packages for
many different kinds of system, at which point the Python-specific
interest becomes very small indeed. Generally, one has to choose one
of these levels and work mostly at that level when dealing with
packages, and I would argue that the best level is that of the system,
making language-specific solutions fit inside the facilities (and
restrictions) of the framework provided at the system level.

I think there is some merit in allowing people with a Python interest
to follow new developments (as can be done somewhat with the Package
Index) and for references to system-specific packages to be
incorporated into such a service. At one point I started writing a Web
application to do this, but instead of focusing on manual editing of
package details, it would be better to link the package records to
other services which make the actual system packages available. There
could also be unofficial build systems which provide such system
packages ahead of the usual operating system distribution release
schedule that people often complain about (in that they don't get the
latest stuff quickly enough).

For example, you'd have a package record like this:

  Name: XYZ
  Platforms:
    Debian: http://debian.package.server/python-xyz
    Windows: http://windows.package.server/python-xyz

Maybe you'd delegate the versioning and architecture availability to
the specific platforms.

> Unfortunately I'm not expert enough to build such a system - but if
> there is enough interest in the community I gladly would like to help.

There is ongoing work on packaging-related matters. Perhaps you should
subscribe to the catalog-sig or distutils-sig mailing lists (see
mail.python.org for details). That said, I'm skeptical about language-
specific packaging precisely because of the reasons given above, and
to make my own Python libraries and applications work within the
Debian mechanisms is something I've learned to do. Since that is all
that really matters to me, I don't see that much benefit in learning
something more sophisticated for Python which does less in my own
environment, which I consider to be the operating system and not the
language technology.

Paul


From digitig at gmail.com  Tue Feb 24 12:42:10 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 17:42:10 +0000
Subject: try except question - serious foo bar question, and pulling my 
	hair out :-)
In-Reply-To: <6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com> <49A3E943.3010405@shopzeus.com>
	<mailman.664.1235484376.11746.python-list@python.org>
	<6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>
Message-ID: <aee48b3c0902240942h70225429vabd16424e2e62ca6@mail.gmail.com>

2009/2/24 Grant Edwards <invalid at invalid>:

> It works with a person as well as stuffed toys -- but trying to
> order a person on the internet gets you in a lot more trouble.
> It's also a little more embarassing when you realize your
> mistake in front of a person. ?OTOH, sometimes a person will
> ask an enlightening question; but, sometimes they just make
> unhelpfull wisecracks. ?It's a tough choice.

I used to use a baby, which avoids the embarrassment but can be just
as problematic to order on the internet.

-- 
Tim Rowe


From nytrokiss at gmail.com  Tue Feb 24 12:45:44 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Tue, 24 Feb 2009 19:45:44 +0200
Subject: Unix Change Passwd Python CGI
In-Reply-To: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
References: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
Message-ID: <8a6b8e350902240945q3676adefjab2163ea8fdb8407@mail.gmail.com>

IMHO That sounds like the biggest security hole I can think of. Anyways you
can open a pipe to passwd. to have the change there password.

James

On Tue, Feb 24, 2009 at 5:19 PM, Derek Tracy <tracyde at gmail.com> wrote:

> I am using python version 2.5.1 and need to create a python cgi application
> to allow a user to change their unix password.
>
> Apache is running on the same system that needs the password changed.  I
> need to keep security high and can not install additional modules at this
> time.
>
> I just need a general direction to start looking, and I do not have expect
> installed on the system.
>
> Any ideas would be wonderful!
>
> R/S --
> ---------------------------------
> Derek Tracy
> tracyde at gmail.com
> ---------------------------------
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From mathieu.malaterre at gmail.com  Tue Feb 24 12:48:56 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Tue, 24 Feb 2009 09:48:56 -0800 (PST)
Subject: =?windows-1252?B?J3UnIAlPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gCSg3KQ==?=
Message-ID: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>

I did not know where to report that:

'u' 	Obselete type ? it is identical to 'd'. 	(7)

http://docs.python.org/library/stdtypes.html#string-formatting

Thanks


From blogger at ferg.org  Tue Feb 24 13:09:52 2009
From: blogger at ferg.org (blogger at ferg.org)
Date: Tue, 24 Feb 2009 10:09:52 -0800 (PST)
Subject: Python 3 and easygui problem
References: <49A0D88F.4010806@internode.on.net>
	<mailman.432.1235279162.11746.python-list@python.org>
Message-ID: <45725a69-d020-41e1-a159-3fa16a14a555@17g2000vbf.googlegroups.com>

Thanks to all for helping Peter on this.

Just a bit of an update...

The solution offered in this thread to Peter's original problem is the
same as the once I arrived at.  There is a bit of discussion about it
here:
http://pythonconquerstheuniverse.blogspot.com/2009/01/moving-to-python-30-part1.html

The current version of EasyGui doesn't run under 3.0, but Peter and I
are in contact and we're working on a version that will. (No estimated
availablity date yet.)

EasyGui is not in PyPI.  A semi-significant revision of EasyGui is in
the works (no predicted availablity date yet).  Once that revision is
out the door, I'll look into putting EasyGui into PyPI.

Again, thanks to all who participated in this thread.

-- Steve Ferg


From deets at nospam.web.de  Tue Feb 24 13:36:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 24 Feb 2009 19:36:28 +0100
Subject: python sql query in django
In-Reply-To: <fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
Message-ID: <70it1cF95tgfU1@mid.uni-berlin.de>

> 
> Thanks for all your suggestions.  From what I've experienced in Django
> and now that I know a little more about how Python functions, I will
> probably use a combination of PHP and Django, instead of trying to get
> Python to do the web portion of my project.  Thanks again!

That sounds like the worst idea. Django's ORM is good when used from 
within django, because of all the additional goodies like the admin 
interface.

But if you are going to do the webfrontend using PHP, what part is left 
for django? If it's only the ORM (for whatever you still use that 
anyway), there are better alternatives - SQLAlchemy, and SQLObject, for 
Python. They are more powerful and not interwoven with django.


If you are going to hand-code the interface in PHP, I fail to see though 
why you don't do that in Django directly. You are not forced to use the 
Admin-interface.

Diez


From mobiledreamers at gmail.com  Tue Feb 24 13:53:29 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Tue, 24 Feb 2009 10:53:29 -0800
Subject: Accessing callers context from callee method
Message-ID: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>

when i call a method foo from another method func. can i access func context
variables or locals() from foo
so
def func():
  i=10
  foo()

in foo, can i access func's local variables on in this case i
Thanks a lot
-- 
Bidegg worlds best auction site
http://bidegg.com
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From R.Bauer at fz-juelich.de  Tue Feb 24 13:53:43 2009
From: R.Bauer at fz-juelich.de (Reimar Bauer)
Date: Tue, 24 Feb 2009 19:53:43 +0100
Subject: pdftk
Message-ID: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>

Hi

Does one know about a python interface to pdftk?
Or something similar which can be used to fill a form by fdf data.

cheers
Reimar


From clp2 at rebertia.com  Tue Feb 24 13:56:36 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 10:56:36 -0800
Subject: Accessing callers context from callee method
In-Reply-To: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
Message-ID: <50697b2c0902241056h14e92b8cu3ea2270d3c1b5bd3@mail.gmail.com>

On Tue, Feb 24, 2009 at 10:53 AM,  <mobiledreamers at gmail.com> wrote:
> when i call a method foo from another method func.?can i access func context
> variables or locals() from foo
> so
> def func():
> ??i=10
> ??foo()
>
> in foo, can i access func's local variables on in this case i

You can, but it's an evil hack that I would avoid if at all possible;
there are almost certainly better ways to accomplish whatever your
goal is.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From zaheer.agadi at gmail.com  Tue Feb 24 14:05:26 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Tue, 24 Feb 2009 11:05:26 -0800 (PST)
Subject: Is there any equivalent feature available in Python..?
Message-ID: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>

Hi,

Is there any Python equivalent of java jar,can I include all my
sources,properties file etc into a single file.Is there anyway in
Python that I can run like the following

java  -jar Mytest.jar --startwebserver

How to so something like this in Python?

Thanks


From ajaksu at gmail.com  Tue Feb 24 14:12:42 2009
From: ajaksu at gmail.com (ajaksu)
Date: Tue, 24 Feb 2009 11:12:42 -0800 (PST)
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<mailman.454.1235312488.11746.python-list@python.org>
Message-ID: <d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>

Steve Holden wrote:
> And the "multiplatform client" that should "easily and elegantly allow
> app browsing, downloading and installing those apps" would presumably
> have to account for the many differences in package formats and install
> requirements between the different platforms.

And then you'd also need to re-download the app if you need it on a
(sometimes slightly) different platform.

Unless the Souq can beat Apple in its own game, by offering
Multiversal Binaries that work across hardware platforms, OSes and
their versions, GUI frameworks, Python versions and universes.
Settling for Downright Obese Binaries if supporting different
universes is considered overkill would be OK too.

shoulda-include-a-single-asset-8-by-8-shotgun-cross-compiler-ly y'rs
Daniel


From clp2 at rebertia.com  Tue Feb 24 14:15:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 11:15:50 -0800
Subject: Is there any equivalent feature available in Python..?
In-Reply-To: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0902241115q24a85659le2580a4b36d7a59c@mail.gmail.com>

On Tue, Feb 24, 2009 at 11:05 AM,  <zaheer.agadi at gmail.com> wrote:
> Hi,
>
> Is there any Python equivalent of java jar,can I include all my
> sources,properties file etc into a single file.Is there anyway in
> Python that I can run like the following
>
> java ?-jar Mytest.jar --startwebserver
>
> How to so something like this in Python?

It's mostly possible. See http://docs.python.org/library/zipimport.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tjreedy at udel.edu  Tue Feb 24 14:19:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 24 Feb 2009 14:19:54 -0500
Subject: shared lib from python code?
In-Reply-To: <49A40ABB.6090502@arimaz.com>
References: <49A27608.3050403@arimaz.com>
	<49A28BD6.9040701@arimaz.com>	<89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
	<49A40ABB.6090502@arimaz.com>
Message-ID: <go1h8n$c2a$1@ger.gmane.org>

Gabriel Rossetti wrote:

> Ok, I see, thank you. I thought this was possible since I have used 
> *.pyd files before and from what I had read they were dynamic library 
> files. I guess they must be written in C/C++ then. Thank you for the 
> explanation.

Yes, that can be confusing.  Unlike .py, .pyc, .pyo, a .pyd is a 
Windows-only version of a .dll that is called .pyd instead of .dll for 
technical reasons I have forgotten.   The difference is not directly 
relevant to *Python* programming.



From kyosohma at gmail.com  Tue Feb 24 14:19:55 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 24 Feb 2009 11:19:55 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
Message-ID: <1ac16d2b-d189-4fca-8a3a-ff45636f118a@s36g2000vbp.googlegroups.com>

On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?No, It uses the the S-lang for video, and input control. However, SLAG
> > ?is more of an abstract layer on top of that.
>
> > ?It has a Structures that contains menus and screens (menumodule /
> > ?screenmodule). One LOADS them up with parameters. ?such as creating
> > ?a new menu is like:
>
> > ?OpenMenu( Company name, SubSystem, this program name, mode, bottom
> > ?status display) - Create initial menu structure Addtomenu(Menu
> > ?Block Set name, DISPLAY line, ID, type of program, password ID ) -
> > ?add to / update MENU blocks. ?runMenu() - Displays the whole create
> > ?menu structure.
>
> > ?The Menu structure is done in pull downs and scrollable blocks in a
> > ?TUI (text User Interface) and using the S-lang screen library is
> > ?fully mouseable.
>
> > ?The screen module works mych the same way, but with the abiltity to
> > ?open and close and work within "Sub Screens".
>
> > ?For those who do not know, S-lang is a interpreted language much
> > ?like Python. However, there is s direth of library modules. The
> > ?original S-lang started out as library of screen of keyboard
> > ?modules, but has been expanded
>
> > ?My SLAG project does not care in reality WHICH or what language, it
> > ?is simply handling menu and screen control.
>
> So do you want to embed python into your code?
>
> I'm still not clear what you are trying to achieve with python, though
> I have a better idea what SLAG is now!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Maybe he wants SendKeys? Here's the link just in case:
http://pypi.python.org/pypi/SendKeys/0.3

Mike


From madhav.bnk at gmail.com  Tue Feb 24 14:38:27 2009
From: madhav.bnk at gmail.com (madhav)
Date: Tue, 24 Feb 2009 11:38:27 -0800 (PST)
Subject: Run a linux system command as a superuser, using a python script
Message-ID: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>

I have got postfix installed on my machine and I am updating on of its
configuration files programmatically(using python)(on some action).
Since any change in the configuration needs a reload, I need to reload
postfix to reflect the latest change. How can I do that in a python
script. Precisely, I have something like this:

import subprocess
subprocess.Popen('sudo /etc/init.d/postifx reload')

Since this script should be run in no-human environment(on the fly), I
cant supply the sudo password or even root password(if needed). Even
sudo doesn't have a flag to input the password for the command at the
first shot. How do I do this?


From clp2 at rebertia.com  Tue Feb 24 14:44:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 11:44:16 -0800
Subject: Run a linux system command as a superuser, using a python script
In-Reply-To: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>

On Tue, Feb 24, 2009 at 11:38 AM, madhav <madhav.bnk at gmail.com> wrote:
> I have got postfix installed on my machine and I am updating on of its
> configuration files programmatically(using python)(on some action).
> Since any change in the configuration needs a reload, I need to reload
> postfix to reflect the latest change. How can I do that in a python
> script. Precisely, I have something like this:
>
> import subprocess
> subprocess.Popen('sudo /etc/init.d/postifx reload')
>
> Since this script should be run in no-human environment(on the fly), I
> cant supply the sudo password or even root password(if needed). Even
> sudo doesn't have a flag to input the password for the command at the
> first shot. How do I do this?

pexpect may be useful in this situation - http://www.noah.org/wiki/Pexpect

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From wescpy at gmail.com  Tue Feb 24 14:59:03 2009
From: wescpy at gmail.com (wesley chun)
Date: Tue, 24 Feb 2009 11:59:03 -0800
Subject: [Tutor] Accessing callers context from callee method
In-Reply-To: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
Message-ID: <78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>

> when i call a method foo from another method func.?can i access func context
> variables or locals() from foo
> so
> def func():
> ??i=10
> ??foo()
>
> in foo, can i access func's local variables


A. python has statically-nested scoping, so you can do it as long as you:

1. define foo() as an inner function -- its def is contained within
func()'s def:
def func():
    i = 10
    def foo():
        print i

2. you don't define a variable with the same name locally. in other
words, you do have access to func()'s 'i' as long as you don't create
another 'i' within foo() -- if you do, only your new local 'i' will be
within your scope.

B. another alterative is to pass in all of func()'s local variables to foo():

foo(**locals())

this will require you to accept the incoming dictionary in foo() and
access the variables from it instead of having them be in foo()'s
scope.

C. in a related note, your question is similar to that of global vs.
local variables. inside a function, you have access to the global as
long as you don't define a local using the same name. should you only
wish to manipulate the global one, i.e. assign a new value to it
instead of creating a new local variable with that name, you would
need to use the "global" keyword to specify that you only desire to
use and update the global one.

i = 0
def func():
    i = 10

in this example, the local 'i' in func() hides access to the global
'i'. in the next code snippet, you state you only want to
access/update the global 'i'... IOW, don't create a local one:

i = 0
def func():
    global i
    i = 10

D. this doesn't work well for inner functions yet:

i = 0
def func():
    i = 10
    def foo():
        i = 20

the 'i' in foo() shadows/hides access to func()'s 'i' as well as the
global 'i'. if you issue the 'global' keyword, that only gives you
access to the global one:

i = 0
def func():
    i = 10
    def foo():
        global i
        i = 20

you cannot get access to func()'s 'i' in this case.

E. however, starting in Python 3.x, you'll be able to do somewhat
better with the new 'nonlocal' keyword:

i = 0
print('globally, i ==', i)
def func():
    i = 10
    print('in func(), i ==', i)
    def foo():
        nonlocal i
        i = 20
        print('in foo(), i ==', i)
    foo()
    print('in func() after calling foo(), i ==', i)
func()

in this case, foo() modified func()'s 'i'.

hope this helps!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From marduk at letterboxes.org  Tue Feb 24 15:10:47 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 24 Feb 2009 15:10:47 -0500
Subject: Is there any equivalent feature available in Python..?
In-Reply-To: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
Message-ID: <1235506247.13502.8.camel@centar.nbk>

On Tue, 2009-02-24 at 11:05 -0800, zaheer.agadi at gmail.com wrote:
> Hi,
> 
> Is there any Python equivalent of java jar,can I include all my
> sources,properties file etc into a single file.Is there anyway in
> Python that I can run like the following
> 
> java  -jar Mytest.jar --startwebserver
> 
> How to so something like this in Python?

Similar but not equal:

$ tree mytest
mytest
|-- __init__.py
`-- main.py

$ cat mytest/__init__.py 
if __name__ == '__main__':
    import sys
    print sys.argv
    import mytest.main

$ cat mytest/main.py 
print 'hi mom'

$ zip -r mytest.zip mytest
  adding: mytest/ (stored 0%)
  adding: mytest/main.py (stored 0%)
  adding: mytest/__init__.py (deflated 4%)

$ PYTHONPATH=mytest.zip python -m mytest --startserver
[None, '--startserver']
hi mom





From rhamph at gmail.com  Tue Feb 24 15:16:40 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Tue, 24 Feb 2009 12:16:40 -0800 (PST)
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org> 
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org> 
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org> 
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org> 
	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org> 
	<gnvldk$827$1@news.motzarella.org>
Message-ID: <ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>

On Feb 23, 7:18?pm, bvdp <b... at mellowood.ca> wrote:
> Gabriel Genellina wrote:
> > En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <b... at mellowood.ca> escribi?:
> >> Gabriel Genellina wrote:
> >>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <b... at mellowood.ca> escribi?:
> >>>> Chris Rebert wrote:
> >>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <b... at mellowood.ca> wrote:
>
> >>>>> [problem with Python and Windows paths using backslashes]
> >>>>> ?Is there any particular reason you can't just internally use regular
> >>>>> forward-slashes for the paths? [...]
>
> >>>> you are absolutely right! Just use '/' on both systems and be done
> >>>> with it. Of course I still need to use \x20 for spaces, but that is
> >>>> easy.
> >>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in
> >>> URLs, that becomes a space only after decoding.
>
> >> I need to use the \x20 because of my parser. I'm reading unquoted
> >> lines from a file. The file creater needs to use the form "foo\x20bar"
> >> without the quotes in the file so my parser can read it as a single
> >> token. Later, the string/token needs to be decoded with the \x20
> >> converted to a space.
>
> >> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"
> >> is one.
>
> >> So, it's not really a problem of what happens when you assign a string
> >> in the form "foo bar", rather how to convert the \x20 in a string to a
> >> space. I think the \\ just complicates the entire issue.
>
> > Just thinking, if you was reading the string from a file, why were you
> > worried about \\ and \ in the first place? (Ok, you moved to use / so
> > this is moot now).
>
> Just cruft introduced while I was trying to figure it all out. Having to
> figure the \\ and \x20 at same time with file and keyboard input just
> confused the entire issue :) Having the user set a line like
> c:\\Program\x20File ... works just fine. I'll suggest he use
> c:/program\x20files to make it bit simple for HIM, not my parser.
> Unfortunately, due to some bad design decisions on my part about 5 years
> ago I'm afraid I'm stuck with the \x20.
>
> Thanks.

You're confusing the python source with the actual contents of the
string.  We already do one pass at decoding, which is why \x20 is
quite literally no different from a space:

>>> '\x20'
' '

However, the interactive interpreter uses repr(x), so various
characters that are considered formatting, such as a tab, get
reescaped when printing:

>>> '\t'
'\t'
>>> len('\t')
1

It really is a tab that gets stored there, not the escape for one.

Finally, if you give python an unknown escape it passes it leaves it
as an escape.  Then, when the interactive interpreter uses repr(x), it
is the backslash itself that gets reescaped:

>>> '\P'
'\\P'
>>> len('\P')
2
>>> list('\P')
['\\', 'P']

What does this all mean?  If you want to test your parser with python
literals you need to escape them twice, like so:

>>> 'c:\\\\Program\\x20Files\\\\test'
'c:\\\\Program\\x20Files\\\\test'
>>> list('c:\\\\Program\\x20Files\\\\test')
['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
'2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']
>>> 'c:\\\\Program\\x20Files\\\\test'.decode('string-escape')
'c:\\Program Files\\test'
>>> list('c:\\\\Program\\x20Files\\\\test'.decode('string-escape'))
['c', ':', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', ' ', 'F', 'i',
'l', 'e', 's', '\\', 't', 'e', 's', 't']

However, there's an easier way: use raw strings, which prevent python
from unescaping anything:

>>> r'c:\\Program\x20Files\\test'
'c:\\\\Program\\x20Files\\\\test'
>>> list(r'c:\\Program\x20Files\\test')
['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
'2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']


From sjmachin at lexicon.net  Tue Feb 24 15:24:44 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 12:24:44 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
Message-ID: <31fa575a-cc0d-4830-ae23-0a784fa3361f@13g2000yql.googlegroups.com>

On Feb 25, 4:48?am, mathieu <mathieu.malate... at gmail.com> wrote:
> I did not know where to report that:
>
> 'u' ? ? Obselete type ? it is identical to 'd'. ? ? ? (7)
>
> http://docs.python.org/library/stdtypes.html#string-formatting


So what's your problem with that? Do you believe that 'u' is not
accepted? That 'u' is not identical to 'd' and thus the doc should be
rewritten as "its behaviour is identical to that of 'd'"? That the
behaviour of 'u' is NOT identical to that of 'd'? That 'u' should not
be documented? That 'u' should not be described as obselete?



From rt8396 at gmail.com  Tue Feb 24 15:28:58 2009
From: rt8396 at gmail.com (r)
Date: Tue, 24 Feb 2009 12:28:58 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com> 
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com> 
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com> 
	<mailman.379.1235164156.11746.python-list@python.org>
Message-ID: <0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>

On Feb 20, 3:09?pm, Dotan Cohen <dotanco... at gmail.com> wrote:
> > Even 3DS or Maya is easier to learn that Blender.
>
> Notepad is easier to learn that VI. Not a good program does simple make.

And not a good program does complex make either Yoda.

Assembly language is very powerful and allows full control down to the
processor level. With your logic all programs would be written in
assembly. Only problem is with that logic we would be 30 years behind
in development of software at this time. Abstraction is paramount to
advancement. With abstraction now you can focus on the problem at hand
instead of miles of steps just to get to the problem at hand. Human
beings are not hardware, we need high levels of abstraction so we can
do what we do best... dream, image, and create.


From zorro at chez.Com  Tue Feb 24 15:43:17 2009
From: zorro at chez.Com (JB)
Date: Tue, 24 Feb 2009 21:43:17 +0100
Subject: pdftk
In-Reply-To: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
References: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
Message-ID: <49a45bee$0$4999$426a74cc@news.free.fr>

Reimar Bauer a ?crit :
> Hi
> 
> Does one know about a python interface to pdftk?
> Or something similar which can be used to fill a form by fdf data.

everyday i use :

import os
os.system("pdftk.exe source.pdf fill_form data.fdf output output.pdf 
flatten")

and BIM


;)


From yanegomi at gmail.com  Tue Feb 24 15:55:15 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Tue, 24 Feb 2009 12:55:15 -0800
Subject: Cross-compiling error when compiling 2.6.1...
Message-ID: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>

I come across the following error:

checking for chflags... configure: error: cannot run test program
while cross compiling
See `config.log' for more details.
make-3.81[1]: ***
[/nobackup/garrcoop/python_upgrade/contrib/python/obj-mips32/Makefile]
Error 1
make-3.81[1]: Leaving directory `/nobackup/garrcoop/python_upgrade'
make-3.81: *** [all] Error 2

The blurb from configure that does this test says:

# On Tru64, chflags seems to be present, but calling it will
# exit Python

Basically this testcase (while valid for Tru64) doesn't work with many
cross-compilation environments. Couldn't test instead be disabled, but
the compilation continue with a warning? Erroring out the build seems
like a silly decision...

Thanks,
-Garrett


From cto at openmigration.net  Tue Feb 24 16:04:36 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:04:36 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<mailman.454.1235312488.11746.python-list@python.org>
	<d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>
Message-ID: <f3cc57c60902241304l68cee5e1j6b4d54f446f28fa7@mail.gmail.com>

Just a few quick questions on your proposed design:

1) What tools, if any, do you propose to help developers package for this
platform?
2) How do you plan to deal with applications that change or depend on
system-wide settings, ie, conf files, kernel version, or the registry?
3) What advantages do you see this having over, say, porting portage or
apt-get?

Thanks for your time,

Geremy Condra
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From adleslie at gmail.com  Tue Feb 24 16:13:34 2009
From: adleslie at gmail.com (May)
Date: Tue, 24 Feb 2009 13:13:34 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
Message-ID: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>

On Feb 24, 10:36?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > Thanks for all your suggestions. ?From what I've experienced in Django
> > and now that I know a little more about how Python functions, I will
> > probably use a combination of PHP and Django, instead of trying to get
> > Python to do the web portion of my project. ?Thanks again!
>
> That sounds like the worst idea. Django's ORM is good when used from
> within django, because of all the additional goodies like the admin
> interface.
>
> But if you are going to do the webfrontend using PHP, what part is left
> for django? If it's only the ORM (for whatever you still use that
> anyway), there are better alternatives - SQLAlchemy, and SQLObject, for
> Python. They are more powerful and not interwoven with django.
>
> If you are going to hand-code the interface in PHP, I fail to see though
> why you don't do that in Django directly. You are not forced to use the
> Admin-interface.
>
> Diez

Hello Diez,

I think Django is fabulous for the admin-interface, a simple text
search and template inheritance.  I will use Django for all of those.
What I'm not getting an answer to and cannot find an example of is a
complex search, where I have to retrieve data from multiple tables,
combine the data, remove the duplicates, etc between a web page and
the database.  The code that started this thread is only a small piece
of the complex data retrieval I need to do.  PHP is great for writing
complex SQL queries right in the HTML template and I know exactly what
it is doing.


From bob at mellowood.ca  Tue Feb 24 16:13:47 2009
From: bob at mellowood.ca (bvdp)
Date: Tue, 24 Feb 2009 14:13:47 -0700
Subject: more on unescaping escapes
In-Reply-To: <ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org>
	<gnvldk$827$1@news.motzarella.org>
	<ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>
Message-ID: <go1nub$98q$1@news.motzarella.org>

Adam Olsen wrote:
> On Feb 23, 7:18 pm, bvdp <b... at mellowood.ca> wrote:
>> Gabriel Genellina wrote:
>>> En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <b... at mellowood.ca> escribi?:
>>>> Gabriel Genellina wrote:
>>>>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <b... at mellowood.ca> escribi?:
>>>>>> Chris Rebert wrote:
>>>>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <b... at mellowood.ca> wrote:
>>>>>>> [problem with Python and Windows paths using backslashes]
>>>>>>>  Is there any particular reason you can't just internally use regular
>>>>>>> forward-slashes for the paths? [...]
>>>>>> you are absolutely right! Just use '/' on both systems and be done
>>>>>> with it. Of course I still need to use \x20 for spaces, but that is
>>>>>> easy.
>>>>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in
>>>>> URLs, that becomes a space only after decoding.
>>>> I need to use the \x20 because of my parser. I'm reading unquoted
>>>> lines from a file. The file creater needs to use the form "foo\x20bar"
>>>> without the quotes in the file so my parser can read it as a single
>>>> token. Later, the string/token needs to be decoded with the \x20
>>>> converted to a space.
>>>> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"
>>>> is one.
>>>> So, it's not really a problem of what happens when you assign a string
>>>> in the form "foo bar", rather how to convert the \x20 in a string to a
>>>> space. I think the \\ just complicates the entire issue.
>>> Just thinking, if you was reading the string from a file, why were you
>>> worried about \\ and \ in the first place? (Ok, you moved to use / so
>>> this is moot now).
>> Just cruft introduced while I was trying to figure it all out. Having to
>> figure the \\ and \x20 at same time with file and keyboard input just
>> confused the entire issue :) Having the user set a line like
>> c:\\Program\x20File ... works just fine. I'll suggest he use
>> c:/program\x20files to make it bit simple for HIM, not my parser.
>> Unfortunately, due to some bad design decisions on my part about 5 years
>> ago I'm afraid I'm stuck with the \x20.
>>
>> Thanks.
> 
> You're confusing the python source with the actual contents of the
> string.  We already do one pass at decoding, which is why \x20 is
> quite literally no different from a space:
> 
>>>> '\x20'
> ' '
> 
> However, the interactive interpreter uses repr(x), so various
> characters that are considered formatting, such as a tab, get
> reescaped when printing:
> 
>>>> '\t'
> '\t'
>>>> len('\t')
> 1
> 
> It really is a tab that gets stored there, not the escape for one.
> 
> Finally, if you give python an unknown escape it passes it leaves it
> as an escape.  Then, when the interactive interpreter uses repr(x), it
> is the backslash itself that gets reescaped:
> 
>>>> '\P'
> '\\P'
>>>> len('\P')
> 2
>>>> list('\P')
> ['\\', 'P']
> 
> What does this all mean?  If you want to test your parser with python
> literals you need to escape them twice, like so:
> 
>>>> 'c:\\\\Program\\x20Files\\\\test'
> 'c:\\\\Program\\x20Files\\\\test'
>>>> list('c:\\\\Program\\x20Files\\\\test')
> ['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
> '2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']
>>>> 'c:\\\\Program\\x20Files\\\\test'.decode('string-escape')
> 'c:\\Program Files\\test'
>>>> list('c:\\\\Program\\x20Files\\\\test'.decode('string-escape'))
> ['c', ':', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', ' ', 'F', 'i',
> 'l', 'e', 's', '\\', 't', 'e', 's', 't']
> 
> However, there's an easier way: use raw strings, which prevent python
> from unescaping anything:
> 
>>>> r'c:\\Program\x20Files\\test'
> 'c:\\\\Program\\x20Files\\\\test'
>>>> list(r'c:\\Program\x20Files\\test')
> ['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
> '2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']

Thank you. That is very clear. Appreciate your time.


From cto at openmigration.net  Tue Feb 24 16:16:07 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:16:07 -0500
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
	<mailman.379.1235164156.11746.python-list@python.org>
	<0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>
Message-ID: <f3cc57c60902241316s49e5fb14v4197e660a32a3d71@mail.gmail.com>

I'm interested. If you are still serious about doing this in two months,
send me an email. If you have
something put together at that point we can talk about its future. Sound
fair?

Geremy Condra
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From cto at openmigration.net  Tue Feb 24 16:26:15 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:26:15 -0500
Subject: Run a linux system command as a superuser, using a python script
In-Reply-To: <50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
	<50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>
Message-ID: <f3cc57c60902241326j790cad8au4c2e76b1ca1d9bba@mail.gmail.com>

Run the script as root and have it drop privs when it doesn't need them. Or
set up a separate daemon to do the rootish parts of it.
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From btaylordesign at gmail.com  Tue Feb 24 16:34:39 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 24 Feb 2009 13:34:39 -0800 (PST)
Subject: Problem with environment variables and cx_Oracle
Message-ID: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>

Hello everyone,

Here's my setup: OS X (10.5.6 - Intel), Oracle Instant Clinet 10_2,
Python 2.6.1, Django trunk

I have my Oracle instantclient folder at: /Users/bft228/Library/Oracle/
instantclient_10_2

In my .bash_profile, I have ORACLE_HOME and LD_LIBRARY_PATH specified
as:

ORACLE_HOME="$HOME/Library/Oracle/instantclient_10_2"
export ORACLE_HOME

LD_LIBRARY_PATH=$ORACLE_HOME
export LD_LIBRARY_PATH


When I try to compile cx_Oracle-4.4.1 or 5.0.1, I get an error stating
that it cannot find an Oracle installation. setup.py will error here:

# try to determine the Oracle home
userOracleHome = os.environ.get("ORACLE_HOME")


Now, here's where things get wierd...
If I: echo $ORACLE_HOME = /Users/bft228/Library/Oracle/
instantclient_10_2
If I: python
      import os
      os.environ

      'ORACLE_HOME': '/Users/bft228/Library/Oracle/
instantclient_10_2',
      'LD_LIBRARY_PATH': '/Users/bft228/Library/Oracle/
instantclient_10_2'

If I hard-code the userOracleHome, cx_Oracle will compile, but I'm
getting errors wen attempting to connect to Oracle, like:
cx_Oracle.InterfaceError: Unable to acquire Oracle environment handle

I've been wrestling with this for quite some time. My Oracle person
assures me that my user has appropriate permissions for the schema. My
Oracle experience is pretty limited, but this seems like it's an issue
with the environment on my Mac.

Does anyone have any ideas? I would REALLY appreciate some insight.

Kind regards,
Brandon Taylor

Senior Web Developer
The University of Texas at Austin


From fabiofz at gmail.com  Tue Feb 24 16:36:13 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Tue, 24 Feb 2009 18:36:13 -0300
Subject: Pydev 1.4.4 Released
Message-ID: <cfb578b20902241336v600d854ek9021598fcc38e88c@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.4 have been released -- note that the
release already happened 4 days ago... :)

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com


Release Highlights in Pydev:
----------------------------------------------

This release fixes a critical bug when configuring the interpreter (if
no environment variables were specified, it was not possible to
configure an interpreter)


What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From david.birdsong at gmail.com  Tue Feb 24 16:37:24 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 13:37:24 -0800 (PST)
Subject: Run a linux system command as a superuser, using a python script
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
	<mailman.682.1235504660.11746.python-list@python.org>
Message-ID: <7a449358-dc80-4063-a5cd-a5a1ffd9fba8@c36g2000yqn.googlegroups.com>

On Feb 24, 11:44?am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 11:38 AM, madhav <madhav.... at gmail.com> wrote:
> > I have got postfix installed on my machine and I am updating on of its
> > configuration files programmatically(using python)(on some action).
> > Since any change in the configuration needs a reload, I need to reload
> > postfix to reflect the latest change. How can I do that in a python
> > script. Precisely, I have something like this:
>
> > import subprocess
> > subprocess.Popen('sudo /etc/init.d/postifx reload')
>
> > Since this script should be run in no-human environment(on the fly), I
> > cant supply the sudo password or even root password(if needed). Even
> > sudo doesn't have a flag to input the password for the command at the
> > first shot. How do I do this?
>
> pexpect may be useful in this situation -http://www.noah.org/wiki/Pexpect
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

I vote down the pexpect, you'd be hardcoding a password.  How about
adjusting the sudoers file to grant the user of this script sudo on /
etc/init.d/postifx or even sudo on your python script.


From yanegomi at gmail.com  Tue Feb 24 16:47:02 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Tue, 24 Feb 2009 13:47:02 -0800
Subject: Cross-compiling error when compiling 2.6.1...
In-Reply-To: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>
References: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>
Message-ID: <364299f40902241347m66cd3199h3ee40241f886effc@mail.gmail.com>

On Tue, Feb 24, 2009 at 12:55 PM, Garrett Cooper <yanegomi at gmail.com> wrote:
> I come across the following error:
>
> checking for chflags... configure: error: cannot run test program
> while cross compiling
> See `config.log' for more details.
> make-3.81[1]: ***
> [/nobackup/garrcoop/python_upgrade/contrib/python/obj-mips32/Makefile]
> Error 1
> make-3.81[1]: Leaving directory `/nobackup/garrcoop/python_upgrade'
> make-3.81: *** [all] Error 2
>
> The blurb from configure that does this test says:
>
> # On Tru64, chflags seems to be present, but calling it will
> # exit Python
>
> Basically this testcase (while valid for Tru64) doesn't work with many
> cross-compilation environments. Couldn't test instead be disabled, but
> the compilation continue with a warning? Erroring out the build seems
> like a silly decision...
>
> Thanks,
> -Garrett

    I've so far tied this issue down to the chflags, lchflags, and
printf with %zd support tests. After commenting out those items things
run to completion.
-Garrett


From jason.scheirer at gmail.com  Tue Feb 24 16:51:23 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 13:51:23 -0800 (PST)
Subject: pdftk
References: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
	<49a45bee$0$4999$426a74cc@news.free.fr>
Message-ID: <173702ed-5f86-464a-8153-43a4442957c4@b16g2000yqb.googlegroups.com>

On Feb 24, 12:43?pm, JB <zo... at chez.Com> wrote:
> Reimar Bauer a ?crit :
>
> > Hi
>
> > Does one know about a python interface to pdftk?
> > Or something similar which can be used to fill a form by fdf data.
>
> everyday i use :
>
> import os
> os.system("pdftk.exe source.pdf fill_form data.fdf output output.pdf
> flatten")
>
> and BIM
>
> ;)

Reportlab will let you use an existing PDF as a template, letting you
use its text layout routines to overly your data on the existing page
and output a new document.


From steve at pearwood.info  Tue Feb 24 17:06:28 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Wed, 25 Feb 2009 09:06:28 +1100
Subject: 'u' 	Obselete type =?UTF-8?B?4oCT?= it is identical to 'd'. 	(7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
Message-ID: <01b464c4$0$18215$c3e8da3@news.astraweb.com>

mathieu wrote:

> I did not know where to report that:
> 
> 'u'   Obselete type ? it is identical to 'd'.         (7)
> 
> http://docs.python.org/library/stdtypes.html#string-formatting
> 
> Thanks

If you google on "python bug tracker" the first link is the correct one.

I don't know what you want to report, but I've reported that obsolete is
mispelled:

http://bugs.python.org/issue5361


-- 
Steven



From lionel.keene at gmail.com  Tue Feb 24 17:57:52 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 14:57:52 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
Message-ID: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>

Hello people, I'm looking for a way to get the screen dimensions (in
pixels) using the standard Python library. The only thing I found so
far was the following:

from win32api import GetSystemMetrics
Width = GetSystemMetrics(0)
Height = GetSystemMetrics(1)

I get an error claiming "no module named win32api". It's platform
specific anyway, but I thought I would try.

Anyone got this?

-L


From sjmachin at lexicon.net  Tue Feb 24 18:04:05 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 15:04:05 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
Message-ID: <f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>

On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> mathieu wrote:
> > I did not know where to report that:
>
> > 'u' ? Obselete type ? it is identical to 'd'. ? ? ? ? (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> > Thanks
>
> If you google on "python bug tracker" the first link is the correct one.
>
> I don't know what you want to report, but I've reported that obsolete is
> mispelled:
>
> http://bugs.python.org/issue5361

+1 Own Goal of the Year ... see
 http://www.yourdictionary.com/library/misspelled.html





From kyrie at uh.cu  Tue Feb 24 18:53:13 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 24 Feb 2009 18:53:13 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
Message-ID: <200902241853.13785.kyrie@uh.cu>

On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
> from win32api import GetSystemMetrics

I'd guess that win32api is patform specific, as in "api for win32".

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From cto at openmigration.net  Tue Feb 24 18:59:31 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 18:59:31 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <200902241853.13785.kyrie@uh.cu>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<200902241853.13785.kyrie@uh.cu>
Message-ID: <f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>

For X systems you can use xwininfo, ie:

from commands import getstatusoutput

def get_screen_dims():
status, output = getstatusoutput("xwininfo -root")
if not status:


On Tue, Feb 24, 2009 at 6:53 PM, Luis Zarrabeitia <kyrie at uh.cu> wrote:

> On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
> > from win32api import GetSystemMetrics
>
> I'd guess that win32api is patform specific, as in "api for win32".
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.
> http://profesores.matcom.uh.cu/~kyrie<http://profesores.matcom.uh.cu/%7Ekyrie>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at
http://OpenMigration.net.
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From cto at openmigration.net  Tue Feb 24 19:07:47 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 19:07:47 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<200902241853.13785.kyrie@uh.cu>
	<f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>
Message-ID: <f3cc57c60902241607o40fe03afy1f2a7e2617cffbe5@mail.gmail.com>

my apologies- hit enter accidentally. anyway, just process the output of
that command for the Height: and Width: lines.
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From starsareblueandfaraway at gmail.com  Tue Feb 24 19:07:58 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Tue, 24 Feb 2009 19:07:58 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
Message-ID: <6a5569ec0902241607y42824929l7d3c93c7571ff24b@mail.gmail.com>

Dear python-list,

I'm having some trouble decoding an email header using the standard
imaplib.IMAP4 class and email.message_from_string method.

In particular, email.message_from_string() does not seem to properly
decode unicode characters in the subject.

How do I decode unicode characters in the subject?

I read on the documentation that the email module supports RFC 2047.
But is there a way to make imaplib.IMAP4 and email.message_from_string
use this protocol?  I'm using Python 2.5.2 on Fedora.  Perhaps this
problem has been fixed already in Python 2.6.

RHH


From lionel.keene at gmail.com  Tue Feb 24 19:12:36 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 16:12:36 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
Message-ID: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>

On Feb 24, 3:53?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
>
> > from win32api import GetSystemMetrics
>
> I'd guess that win32api is patform specific, as in "api for win32".
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

Yes, it's platform specific. I was just trying anyway to see if it
would work.

In a nutshell, what I need is a way to acquire the screen dimensions
(in pixels) and its dpi setting.


From zvezdan at zope.com  Tue Feb 24 19:28:43 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Tue, 24 Feb 2009 19:28:43 -0500
Subject: Problem with environment variables and cx_Oracle
In-Reply-To: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>
References: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>
Message-ID: <267ABB0C-137A-498D-B078-D74B2E609EC9@zope.com>

On Feb 24, 2009, at 4:34 PM, Brandon Taylor wrote:
> Here's my setup: OS X (10.5.6 - Intel), Oracle Instant Clinet 10_2,
> Python 2.6.1, Django trunk

OS X is an important detail here.

> In my .bash_profile, I have ORACLE_HOME and LD_LIBRARY_PATH specified
> as:
>
> ORACLE_HOME="$HOME/Library/Oracle/instantclient_10_2"
> export ORACLE_HOME
>
> LD_LIBRARY_PATH=$ORACLE_HOME
> export LD_LIBRARY_PATH

Shouldn't this be DYLD_LIBRARY_PATH for Mac?


From bignose+hates-spam at benfinney.id.au  Tue Feb 24 19:32:03 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Wed, 25 Feb 2009 11:32:03 +1100
Subject: 'u'  Obselete type =?utf-8?Q?=E2=80=93?= it is identical to
	'd'.  (7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
Message-ID: <878wnvgxvg.fsf@benfinney.id.au>

John Machin <sjmachin at lexicon.net> writes:

> On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> > I don't know what you want to report, but I've reported that obsolete is
> > mispelled:
> 
> +1 Own Goal of the Year ... see
>  http://www.yourdictionary.com/library/misspelled.html

Not so notable. It's merely one more incident of the law of
communication variously known as McKean's Law, Skitt's Law, and
Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.

-- 
 \      ?I have never made but one prayer to God, a very short one: ?O |
  `\           Lord, make my enemies ridiculous!? And God granted it.? |
_o__)                                                        ?Voltaire |
Ben Finney


From jmcmonagle at NO.SPAM.velseis.com.au  Tue Feb 24 19:38:46 2009
From: jmcmonagle at NO.SPAM.velseis.com.au (John McMonagle)
Date: Wed, 25 Feb 2009 10:38:46 +1000
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
Message-ID: <49a4930c@dnews.tpgi.com.au>

Lionel wrote:
> Yes, it's platform specific. I was just trying anyway to see if it
> would work.
> 
> In a nutshell, what I need is a way to acquire the screen dimensions
> (in pixels) and its dpi setting.

This should work on all platforms:

from Tkinter import *
r = Tk()
r.withdraw()
r.winfo_screenheight()
r.winfo_screenwidth()
r.winfo_pixels('1i')


Regards,

John


From kyrie at uh.cu  Tue Feb 24 19:41:09 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 24 Feb 2009 19:41:09 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
Message-ID: <200902241941.09240.kyrie@uh.cu>

On Tuesday 24 February 2009 07:12:36 pm Lionel wrote:
> In a nutshell, what I need is a way to acquire the screen dimensions
> (in pixels) and its dpi setting.

This is a guess, and a guess only. 
What do you want to know it for? If it is for painting something on the 
screen, maybe (just maybe - I'm guessing here big time), whatever API you are 
using for painting can be used for getting the dimensions of the drawing 
device. I don't even know if GTK or Qt have that feature, but you should look 
into it. If the same api you will use for painting provides that 
functionality, then it would be kind of irrelevant if it is on the stdlib or 
not.

Of course, this only applies if you want to paint and your api provides that 
info.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From sjmachin at lexicon.net  Tue Feb 24 19:52:15 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 16:52:15 -0800 (PST)
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
Message-ID: <44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>

On Feb 25, 11:07?am, "Roy H. Han" <starsareblueandfara... at gmail.com>
wrote:
> Dear python-list,
>
> I'm having some trouble decoding an email header using the standard
> imaplib.IMAP4 class and email.message_from_string method.
>
> In particular, email.message_from_string() does not seem to properly
> decode unicode characters in the subject.
>
> How do I decode unicode characters in the subject?

You don't. You can't. You decode str objects into unicode objects. You
encode unicode objects into str objects. If your input is not a str
object, you have a problem.

I'm no expert on the email package, but experts don't have crystal
balls, so let's gather some data for them while we're waiting for
their timezones to align:

Presumably your code is doing something like:
   msg = email.message_from_string(a_string)

Please report the results of
   print repr(a_string)
and
   print type(msg)
   print msg.items()
and tell us what you expected.

Cheers,
John


From ethan at stoneleaf.us  Tue Feb 24 19:52:20 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 24 Feb 2009 16:52:20 -0800
Subject: pep 8 constants
In-Reply-To: <glbc6v$9eh$1@ger.gmane.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org>
Message-ID: <49A49644.80509@stoneleaf.us>

Steve Holden wrote:
> Brian Allen Vanderburg II wrote:
> 
>>bockman at virgilio.it wrote:
>>
>>>Constants would be a nice addition in python, sure enough.
>>>But I'm not sure that this can be done without a run-time check every
>>>time
>>>the constant is used, and python is already slow enough. Maybe a check
>>>that is disabled when running with optimizing flags ?
>>>
>>>But I'm sure this discussion has been already made and the FINAL WORD has
>>>been already spoken.
>>>
>>>Ciao
>>>----
>>>FB
>>
>>One idea to make constants possible would be to extend properties to be
>>able to exist at the module level as well as the class level:
>>
>>@property
>>def pi():
>>   return 3.14159.....
>>
>>print(pi) # prints 3.14159....
>>pi=32 # Raise an error Cannot set attribute ...
>>
> 
> I don't understand why this would print 3.14159 ... instead of <function
> __math__.pi>, or whatever.
> 
> property would clearly have to do something very different in module
> scope in order to make this work.
> 
> regards
>  Steve

--> class tester(object):
...   @property
...   def pi(self):
...     return 3.141596
...
--> testee = tester()
--> testee.pi
3.1415959999999998

Looks like that's how property works, so the same behavior on a module 
level would do as Brian suggests.
--
~Ethan~


From lionel.keene at gmail.com  Tue Feb 24 20:03:03 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 17:03:03 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
	<mailman.696.1235522481.11746.python-list@python.org>
Message-ID: <d3b164c0-9100-486e-a0fc-4afcbab53019@v13g2000yqm.googlegroups.com>

On Feb 24, 4:41?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 24 February 2009 07:12:36 pm Lionel wrote:
>
> > In a nutshell, what I need is a way to acquire the screen dimensions
> > (in pixels) and its dpi setting.
>
> This is a guess, and a guess only.
> What do you want to know it for? If it is for painting something on the
> screen, maybe (just maybe - I'm guessing here big time), whatever API you are
> using for painting can be used for getting the dimensions of the drawing
> device. I don't even know if GTK or Qt have that feature, but you should look
> into it. If the same api you will use for painting provides that
> functionality, then it would be kind of irrelevant if it is on the stdlib or
> not.
>
> Of course, this only applies if you want to paint and your api provides that
> info.
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

Thanks for the responses so far, everyone. Luis you are indeed a good
guesser! I'm using wxPython/matplotlib and would like to size my
matplotlib data figure so that it assumes a 1:1 ratio on the screen
when embedded in a wxPython form. I'm playing with a 2D array with 320
rows and 177 columns and therefore would like to display the figure
with a size of 320x177 pixels. The problem is that the call to
instantiate the figure takes size parameters of inches and dpi! For
example:

matplotlib.figure.Figure((5,4), 75)

is a figure with width of 5 inches, height of 4 inches, and dpi of 75.
Thanks to Luis' comment I googled around and found that wxPython has
the following functions:

wx.GetDisplaySize()    # Get dimensions in pixels.
wx.GetDisplaySizeMM()  # Get dimensions in millimeters.

It's a little klunky to have a function that takes inches an an
argument and another that produces millimeters when querying the
display, no? Unless someone has a better idea I suppose I'll have to
convert between the two to display at 1:1.

-L

SInce I want my matplotlib.figure.Figure() to assume the exact pixel
dimensions of the 2D array,


From sjmachin at lexicon.net  Tue Feb 24 20:04:30 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 17:04:30 -0800 (PST)
Subject: =?windows-1252?B?UmU6ICd1JyBPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gKDc=?=
	=?windows-1252?B?KQ==?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
	<878wnvgxvg.fsf@benfinney.id.au>
Message-ID: <1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>

On Feb 25, 11:32?am, Ben Finney <bignose+hates-s... at benfinney.id.au>
wrote:
> John Machin <sjmac... at lexicon.net> writes:
> > On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> > > I don't know what you want to report, but I've reported that obsolete is
> > > mispelled:
>
> > +1 Own Goal of the Year ... see
> > ?http://www.yourdictionary.com/library/misspelled.html
>
> Not so notable. It's merely one more incident of the law of
> communication variously known as McKean's Law, Skitt's Law, and
> Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.

Those incidents are mundane and ordinary IMHO compared with
misspelling both "misspelled" and "misspelling" in the bug report.



From steve at holdenweb.com  Tue Feb 24 20:22:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 20:22:29 -0500
Subject: pep 8 constants
In-Reply-To: <49A49644.80509@stoneleaf.us>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org> <49A49644.80509@stoneleaf.us>
Message-ID: <49A49D55.10705@holdenweb.com>

Ethan Furman wrote:
> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
>>> bockman at virgilio.it wrote:
>>>
>>>> Constants would be a nice addition in python, sure enough.
>>>> But I'm not sure that this can be done without a run-time check every
>>>> time
>>>> the constant is used, and python is already slow enough. Maybe a check
>>>> that is disabled when running with optimizing flags ?
>>>>
>>>> But I'm sure this discussion has been already made and the FINAL
>>>> WORD has
>>>> been already spoken.
>>>>
>>>> Ciao
>>>> ----
>>>> FB
>>>
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>
>> I don't understand why this would print 3.14159 ... instead of <function
>> __math__.pi>, or whatever.
>>
>> property would clearly have to do something very different in module
>> scope in order to make this work.
>>
>> regards
>>  Steve
> 
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
> 
> Looks like that's how property works, so the same behavior on a module
> level would do as Brian suggests.

But that's at the class level, not the module level.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb 24 22:15:33 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 22:15:33 -0500
Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
	=?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
In-Reply-To: <1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>	<01b464c4$0$18215$c3e8da3@news.astraweb.com>	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>	<878wnvgxvg.fsf@benfinney.id.au>
	<1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>
Message-ID: <go2d4s$58r$2@ger.gmane.org>

John Machin wrote:
> On Feb 25, 11:32 am, Ben Finney <bignose+hates-s... at benfinney.id.au>
> wrote:
>> John Machin <sjmac... at lexicon.net> writes:
>>> On Feb 25, 9:06 am, Steven D'Aprano <st... at pearwood.info> wrote:
>>>> I don't know what you want to report, but I've reported that obsolete is
>>>> mispelled:
>>> +1 Own Goal of the Year ... see
>>>  http://www.yourdictionary.com/library/misspelled.html
>> Not so notable. It's merely one more incident of the law of
>> communication variously known as McKean's Law, Skitt's Law, and
>> Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.
> 
> Those incidents are mundane and ordinary IMHO compared with
> misspelling both "misspelled" and "misspelling" in the bug report.
> 
I thought that was Ben's point.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From king.seth at gmail.com  Tue Feb 24 22:46:19 2009
From: king.seth at gmail.com (Seth)
Date: Tue, 24 Feb 2009 19:46:19 -0800 (PST)
Subject: Convert PySerial to python 3.0
Message-ID: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>

I am just messing around trying to get pyserial to work with 3.0.

I am stuck on this line:

if type(port) in [type(''), type(u'')]


how can I convert this to 3.0? I tried changing the u to a d that did
not do anything.

Thanks


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 22:52:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 01:52:45 -0200
Subject: pep 8 constants
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it> <4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org> <49A49644.80509@stoneleaf.us>
Message-ID: <op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>  
escribi?:

> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>  I don't understand why this would print 3.14159 ... instead of  
>> <function
>> __math__.pi>, or whatever.
>>  property would clearly have to do something very different in module
>> scope in order to make this work.
>>  regards
>>  Steve
>
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
>
> Looks like that's how property works, so the same behavior on a module  
> level would do as Brian suggests.

Note that:
  - you defined the property inside the *class* tester
  - then, you created an *instance* of such class
  - you retrieve pi from the instance
  - if you retrieve pi from the class (tester.pi), you get a property  
object, not a float.
  - if you directly attach the property to the instance, testee.pi returns  
a property object, not a float.
Finally, consider that modules are instances of type `module`; all modules  
are instances of the same type.

How do you propose to make properties work at the module level?

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Feb 24 22:55:44 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 19:55:44 -0800
Subject: Convert PySerial to python 3.0
In-Reply-To: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
Message-ID: <50697b2c0902241955i66452d48j6ff03b6cebec4cd@mail.gmail.com>

On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.seth at gmail.com> wrote:
> I am just messing around trying to get pyserial to work with 3.0.
>
> I am stuck on this line:
>
> if type(port) in [type(''), type(u'')]
>
>
> how can I convert this to 3.0? I tried changing the u to a d that did
> not do anything.

Looks like it's doing the equivalent of the pre-3.0-ism
`isinstance(port, basestring)`, but in a roundabout way.
However, since basestring doesn't exist in 3.0, either:

if isinstance(port, str):

Or

if isinstance(port, bytes):

would be the appropriate replacement. Depends (obviously) on whether
'port' is supposed to be unicode or a byte sequence.
Without more context, I can't really say which is what you want.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Tue Feb 24 22:57:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 22:57:50 -0500
Subject: pep 8 constants
In-Reply-To: <op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>
	<49A49644.80509@stoneleaf.us>
	<op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <go2fk5$bh6$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>
> escribi?:
> 
>> Steve Holden wrote:
>>> Brian Allen Vanderburg II wrote:
>>>
>>>> One idea to make constants possible would be to extend properties to be
>>>> able to exist at the module level as well as the class level:
>>>>
>>>> @property
>>>> def pi():
>>>>   return 3.14159.....
>>>>
>>>> print(pi) # prints 3.14159....
>>>> pi=32 # Raise an error Cannot set attribute ...
>>>>
>>>  I don't understand why this would print 3.14159 ... instead of
>>> <function
>>> __math__.pi>, or whatever.
>>>  property would clearly have to do something very different in module
>>> scope in order to make this work.
>>>  regards
>>>  Steve
>>
>> --> class tester(object):
>> ...   @property
>> ...   def pi(self):
>> ...     return 3.141596
>> ...
>> --> testee = tester()
>> --> testee.pi
>> 3.1415959999999998
>>
>> Looks like that's how property works, so the same behavior on a module
>> level would do as Brian suggests.
> 
> Note that:
>  - you defined the property inside the *class* tester
>  - then, you created an *instance* of such class
>  - you retrieve pi from the instance
>  - if you retrieve pi from the class (tester.pi), you get a property
> object, not a float.
>  - if you directly attach the property to the instance, testee.pi
> returns a property object, not a float.
> Finally, consider that modules are instances of type `module`; all
> modules are instances of the same type.
> 
> How do you propose to make properties work at the module level?
> 
Thanks, Gabriel. I was beginning to think there was something terribly
obvious I had completely missed.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb 24 23:00:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 23:00:56 -0500
Subject: Convert PySerial to python 3.0
In-Reply-To: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
Message-ID: <go2fq0$bh6$2@ger.gmane.org>

Seth wrote:
> I am just messing around trying to get pyserial to work with 3.0.
> 
> I am stuck on this line:
> 
> if type(port) in [type(''), type(u'')]
> 
> 
> how can I convert this to 3.0? I tried changing the u to a d that did
> not do anything.
> 
How about

if type(port) in (str, bytes):

Untested.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve.ferg.bitbucket at gmail.com  Tue Feb 24 23:08:40 2009
From: steve.ferg.bitbucket at gmail.com (steve.ferg.bitbucket at gmail.com)
Date: Tue, 24 Feb 2009 20:08:40 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together on 
	same *WINDOWS* machine
Message-ID: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>

I'm looking for tips on installing and running Python version 2.6 and
version 3.0 together on same Windows machine.

I'd like to install both 2.6 and 3.0 together on the same Windows
(Vista) machine, so I can test programs under both versions.

Is it possible to install both versions on the same Windows machine in
such a way that they are both asily available and don't interfere with
one another?  I'm concerned, for example, that if I install both, the
second installation will over-write some Python entry in the registry.

I'd like something fairly simple -- I will be sharing this information
with others in my workgroup for whom  virtualenv is not an option.

I googled around, but couldn't find anything that seemed to address
this specific question.  If anybody knows of a URL with this
information (a "2 to 3 Conversion FAQs"?) that would be great.

Any help would be greatly appreciated.

-- Steve Ferg


From zaheer.agadi at gmail.com  Tue Feb 24 23:17:21 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Tue, 24 Feb 2009 20:17:21 -0800 (PST)
Subject: Is there any equivalent feature available in Python..?
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
	<mailman.684.1235506291.11746.python-list@python.org>
Message-ID: <5455a1b6-4e61-42fd-8088-5439732da1c6@g38g2000yqd.googlegroups.com>

On Feb 25, 1:10?am, Albert Hopkins <mar... at letterboxes.org> wrote:
> On Tue, 2009-02-24 at 11:05 -0800, zaheer.ag... at gmail.com wrote:
> > Hi,
>
> > Is there any Python equivalent of java jar,can I include all my
> > sources,properties file etc into a single file.Is there anyway in
> > Python that I can run like the following
>
> > java ?-jar Mytest.jar --startwebserver
>
> > How to so something like this in Python?
>
> Similar but not equal:
>
> $ tree mytest
> mytest
> |-- __init__.py
> `-- main.py
>
> $ cat mytest/__init__.py
> if __name__ == '__main__':
> ? ? import sys
> ? ? print sys.argv
> ? ? import mytest.main
>
> $ cat mytest/main.py
> print 'hi mom'
>
> $ zip -r mytest.zip mytest
> ? adding: mytest/ (stored 0%)
> ? adding: mytest/main.py (stored 0%)
> ? adding: mytest/__init__.py (deflated 4%)
>
> $ PYTHONPATH=mytest.zip python -m mytest --startserver
> [None, '--startserver']
> hi mom

Thanks A lot this should solve my problem.Just out of curiosity how is
Python eggs different from the zip file you created here


From venutaurus539 at gmail.com  Tue Feb 24 23:20:52 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 20:20:52 -0800 (PST)
Subject: Problem with os.system()
Message-ID: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>

Hello,
         I am facing problems while using os.system() of python for
copying a file from source to destination where the file name is in
unicode (multi lingual characters).My python interpreter is trying to
convert them to ascii and is failing. I tried giving unicode string as
input for the function something like:

c = u"copy "+"\""+full_path+"\" "+dest
os.system (c)

where the full_path contains filenames with unicode characters(unicode
data type). I tried searching in google and came to know that UNICODE
support wasn't there for os.system function till python2.3[1].
Currently I am using python2.6 but couldn't find anywhere whether a
support has been provided or not. Can some one suggest me any work
around for this. If I do a manual encoding of the file name to ascii,
it results in loss of data and hence the copy command wouldn't find
the file name.


---------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\unitest.py", line 32, in <module>
    findFile(u"E:\\New Folder")
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 27, in findFile
    os.system (c)
UnicodeEncodeError: 'ascii' codec can't encode characters in position
47-72: ordinal not in range(128)
------------------------------------------------------------------------------------------------------




[1] http://mail.python.org/pipermail/python-list/2003-January/182182.html





Thanks in advance,
Venu M


From grante at visi.com  Tue Feb 24 23:22:34 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 24 Feb 2009 22:22:34 -0600
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
Message-ID: <etidnbVIjawXWjnUnZ2dnUVZ_v7inZ2d@posted.usinternet>

On 2009-02-25, Chris Rebert <clp2 at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.seth at gmail.com> wrote:
>> I am just messing around trying to get pyserial to work with 3.0.
>>
>> I am stuck on this line:
>>
>> if type(port) in [type(''), type(u'')]
>>
>> how can I convert this to 3.0? I tried changing the u to a d that did
>> not do anything.
>
> Looks like it's doing the equivalent of the pre-3.0-ism
> `isinstance(port, basestring)`, but in a roundabout way.
> However, since basestring doesn't exist in 3.0, either:
>
> if isinstance(port, str):
>
> Or
>
> if isinstance(port, bytes):
>
> would be the appropriate replacement. Depends (obviously) on
> whether 'port' is supposed to be unicode or a byte sequence.

Port can either be an integer or a file/device name.

> Without more context, I can't really say which is what you
> want.

In the line of code in question, the conditional is inteded to
be true if "port" is someting that could be passed to the OS as
a file or device name.

-- 
Grant




From venutaurus539 at gmail.com  Tue Feb 24 23:22:47 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 20:22:47 -0800 (PST)
Subject: Problem with os.system()
Message-ID: <3c216f95-0cd9-43ec-91fa-090e9ad00fbc@e5g2000vbe.googlegroups.com>

Hello,
         I am facing problems while using os.system() of python for
copying a file from source to destination where the file name is in
unicode (multi lingual characters).My python interpreter is trying to
convert them to ascii and is failing. I tried giving unicode string as
input for the function something like:

c = u"copy "+"\""+full_path+"\" "+dest
os.system (c)

where the full_path contains filenames with unicode characters(unicode
data type). I tried searching in google and came to know that UNICODE
support wasn't there for os.system function till python2.3[1].
Currently I am using python2.6 but couldn't find anywhere whether a
support has been provided or not. Can some one suggest me any work
around for this. If I do a manual encoding of the file name to ascii,
it results in loss of data and hence the copy command wouldn't find
the file name.


---------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\unitest.py", line 32, in <module>
    findFile(u"E:\\New Folder")
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 27, in findFile
    os.system (c)
UnicodeEncodeError: 'ascii' codec can't encode characters in position
47-72: ordinal not in range(128)
------------------------------------------------------------------------------------------------------




[1] http://mail.python.org/pipermail/python-list/2003-January/182182.html





Thanks in advance,
Venu M


From david.birdsong at gmail.com  Tue Feb 24 23:25:14 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 20:25:14 -0800 (PST)
Subject: single thread decrement a semaphore object more than once?
Message-ID: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>

I searched but didn't see this already discussed, sorry if I didn't
search hard enough.

Can I decrement a semaphore's counter within the same thread more than
once?  I'd like to set hard and soft limits in a server I'm writing.
The server upon initialization would create a semaphore:

threading.Semaphore(100)

Then acquire 50x to hold half of the locks before serving any
requests.  This allows me to grow the number of locks to the hard
limit via signals or some other mechanism, but I need to know that any
1 thread has the ability to acquire up or release more than 1x and
effectively acquire and release for that number of semaphore values.

I could implement this by using regular threading.Lock in a pool, but
the Semaphore object would be much easier.


From girish.cfc at gmail.com  Tue Feb 24 23:50:20 2009
From: girish.cfc at gmail.com (Girish)
Date: Tue, 24 Feb 2009 20:50:20 -0800 (PST)
Subject: XML Parsing
Message-ID: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>

Hello,

I have a xml file which is as follows:

    <pids>
        <Parameter_Class>
            <Parameter Id="pid_031605_093137_283">
                <Identifier>$0000</Identifier>
                <Type>PID</Type>
                <Signal><![CDATA[Parameter Identifiers Supported - $01
to $20]]></Signal>
                <Description><![CDATA[This PID indicates which
legislated PIDs]]></Description>
                 ..............
                 ...............

Can anyone please tell me how to get content of <Signal> tag.. that
is, how to extract the data "![CDATA[Parameter Identifiers Supported -
$01 to $20]]"

Thanks,
Girish...


From steve at holdenweb.com  Tue Feb 24 23:51:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 23:51:41 -0500
Subject: Looking for tips on running Python version 2.6 and 3.0 together
	on    same *WINDOWS* machine
In-Reply-To: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
Message-ID: <49A4CE5D.60702@holdenweb.com>

steve.ferg.bitbucket at gmail.com wrote:
> I'm looking for tips on installing and running Python version 2.6 and
> version 3.0 together on same Windows machine.
> 
> I'd like to install both 2.6 and 3.0 together on the same Windows
> (Vista) machine, so I can test programs under both versions.
> 
> Is it possible to install both versions on the same Windows machine in
> such a way that they are both asily available and don't interfere with
> one another?  I'm concerned, for example, that if I install both, the
> second installation will over-write some Python entry in the registry.
> 
> I'd like something fairly simple -- I will be sharing this information
> with others in my workgroup for whom  virtualenv is not an option.
> 
> I googled around, but couldn't find anything that seemed to address
> this specific question.  If anybody knows of a URL with this
> information (a "2 to 3 Conversion FAQs"?) that would be great.
> 
> Any help would be greatly appreciated.
> 
It's easy - the registry isn't used except to associate files. The
associations are made with the most-recently-installed version.

I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Tue Feb 24 23:55:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 05:55:34 +0100
Subject: Problem with os.system()
In-Reply-To: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
References: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
Message-ID: <go2j06$iv8$1@ger.gmane.org>

venutaurus539 at gmail.com schrieb:
> Hello,
>          I am facing problems while using os.system() of python for
> copying a file from source to destination where the file name is in
> unicode (multi lingual characters).My python interpreter is trying to
> convert them to ascii and is failing. I tried giving unicode string as
> input for the function something like:
> 
> c = u"copy "+"\""+full_path+"\" "+dest
> os.system (c)

First of all do not use os.system() to run external programs. You'll get
in all sorts of trouble like quoting. You are far better of with the
subprocess module.

Second, why are you using an external program at all? The shutil module
contains multiple functions to copy a file or directory.

import shutil
shutil.copy(source, dest)

Christian



From lists at cheimes.de  Tue Feb 24 23:57:43 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 05:57:43 +0100
Subject: single thread decrement a semaphore object more than once?
In-Reply-To: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
References: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
Message-ID: <go2j47$iv8$2@ger.gmane.org>

birdsong wrote:
> I searched but didn't see this already discussed, sorry if I didn't
> search hard enough.
> 
> Can I decrement a semaphore's counter within the same thread more than
> once?  I'd like to set hard and soft limits in a server I'm writing.
> The server upon initialization would create a semaphore:
> 
> threading.Semaphore(100)

Yes, you are not restricted to multiple threads. A semaphore ensures
that the counter is thread safe. It doesn't force you to use threads.

Christian



From martin at v.loewis.de  Wed Feb 25 00:20:11 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 25 Feb 2009 06:20:11 +0100
Subject: Looking for tips on running Python version 2.6 and 3.0 together
	on    same *WINDOWS* machine
In-Reply-To: <mailman.707.1235537518.11746.python-list@python.org>
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
	<mailman.707.1235537518.11746.python-list@python.org>
Message-ID: <49A4D50B.4030803@v.loewis.de>

> It's easy - the registry isn't used except to associate files. The
> associations are made with the most-recently-installed version.
> 
> I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.

In addition, at install time, there is the choice of not creating
associations (i.e. links what interpreter should be invoked if you
double-click a .py file, and what version of IDLE should start
when you select Edit from the context menu).

So if you install 2.6 first, then 3.0, but deselect the installation
of associations, 2.6 will continue to be associated with the
.py, .pyw, and .pyc extensions.

Regards,
Martin


From venutaurus539 at gmail.com  Wed Feb 25 00:28:27 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 21:28:27 -0800 (PST)
Subject: Problem with os.system()
References: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
	<mailman.708.1235537747.11746.python-list@python.org>
Message-ID: <5e5e1d83-4950-42e9-bf1d-51fa6ff5eeaa@d19g2000yqb.googlegroups.com>

On Feb 25, 9:55?am, Christian Heimes <li... at cheimes.de> wrote:
> venutaurus... at gmail.com schrieb:
>
> > Hello,
> > ? ? ? ? ?I am facing problems while using os.system() of python for
> > copying a file from source to destination where the file name is in
> > unicode (multi lingual characters).My python interpreter is trying to
> > convert them to ascii and is failing. I tried giving unicode string as
> > input for the function something like:
>
> > c = u"copy "+"\""+full_path+"\" "+dest
> > os.system (c)
>
> First of all do not use os.system() to run external programs. You'll get
> in all sorts of trouble like quoting. You are far better of with the
> subprocess module.
>
> Second, why are you using an external program at all? The shutil module
> contains multiple functions to copy a file or directory.
>
> import shutil
> shutil.copy(source, dest)
>
> Christian

Thanks Christian for your reply,will definitely try.


From wuwei23 at gmail.com  Wed Feb 25 00:38:35 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 24 Feb 2009 21:38:35 -0800 (PST)
Subject: XML Parsing
References: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>
Message-ID: <660eae9c-c46a-407d-8e35-b18e2915a3fe@p20g2000yqi.googlegroups.com>

On Feb 25, 2:50?pm, Girish <girish.... at gmail.com> wrote:
> Can anyone please tell me how to get content of <Signal> tag.. that
> is, how to extract the data "![CDATA[Parameter Identifiers Supported -
> $01 to $20]]"

Was there something in particular about Jean-Paul Calderone's solution
that didn't satisfy you? http://tinyurl.com/azgo5j




From lie.1296 at gmail.com  Wed Feb 25 00:43:47 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 05:43:47 +0000 (UTC)
Subject: XML Parsing
References: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>
Message-ID: <go2lqj$cco$4@ger.gmane.org>

On Tue, 24 Feb 2009 20:50:20 -0800, Girish wrote:

> Hello,
> 
> I have a xml file which is as follows:
> 
>     <pids>
>         <Parameter_Class>
>             <Parameter Id="pid_031605_093137_283">
>                 <Identifier>$0000</Identifier>
>                 <Type>PID</Type>
>                 <Signal><![CDATA[Parameter Identifiers Supported - $01
> to $20]]></Signal>
>                 <Description><![CDATA[This PID indicates which
> legislated PIDs]]></Description>
>                  ..............
>                  ...............
> 
> Can anyone please tell me how to get content of <Signal> tag.. that is,
> how to extract the data "![CDATA[Parameter Identifiers Supported - $01
> to $20]]"
> 
> Thanks,
> Girish...

The easy one is to use re module (Regular expression). 

# untested
import re
signal_pattern = re.compile('<Signal>(.*)</Signal>')
signals = signal_pattern.findall(xmlstring)

also, you may also use the xml module, which will be more reliable if you 
have data like this: <foo attr="<Signal>blooo</Signal>">blah</foo>,

>>> import xml.dom.minidom
>>> xmldata = xml.dom.minidom.parse(open('myfile.xml'))
>>> for node in xmldata.getElementsByTagName('Signal'): print node.toxml()
... 



From janandith at gmail.com  Wed Feb 25 00:54:49 2009
From: janandith at gmail.com (janandith jayawardena)
Date: Wed, 25 Feb 2009 11:24:49 +0530
Subject: Is there a way to increase memory allocated to the python interpreter
Message-ID: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>

Hi,

Is there a way to configure the amount of memory allocated to the python
interpreter.  Can it be increased or decreased using an argument like in the
Java Virtual Machine.

thanks,
Janandith.
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From ssalam at gmail.com  Wed Feb 25 00:55:21 2009
From: ssalam at gmail.com (Shah Sultan Alam)
Date: Wed, 25 Feb 2009 11:25:21 +0530
Subject: Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
Message-ID: <ef4dfd280902242155q61c988dbiecd043534e15004e@mail.gmail.com>

Hi Groups,
 Can you please help me on the following...

1. Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4

2. If yes, what is the exact 'yum' command to install paramiko on CentOS 4?
I have tried all possible ones without success.

        yum install paramiko
        yum install python-paramiko(with and without version numbers)
        python-paramiko.noarch

Installing it without yum throws dependency problems which are never
ending : starting with python-crypto and python(abi) - which I am
unable to find.

Is there any change that has to be made to the yum repository to point
it to look in a different place?

3. Alternatively, I also have apt-get on the CentOS box - can you tell
me some repos that I can add for apt-get as well?



Regds
Shah


From hrishys at yahoo.co.uk  Wed Feb 25 01:09:25 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 06:09:25 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <go2lqj$cco$4@ger.gmane.org>
Message-ID: <498059.69062.qm@web27404.mail.ukl.yahoo.com>

Hi 

I am just a python enthusiast and not a python user but was just wundering why didnt the list members come up with or recommen XPATH based solution
which i think is very elegant for this type of a problem isnt it ?

regards
Hrishy



--- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:

> From: Lie Ryan <lie.1296 at gmail.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 5:43 AM
> On Tue, 24 Feb 2009 20:50:20 -0800, Girish wrote:
> 
> > Hello,
> > 
> > I have a xml file which is as follows:
> > 
> >     <pids>
> >         <Parameter_Class>
> >             <Parameter
> Id="pid_031605_093137_283">
> >                
> <Identifier>$0000</Identifier>
> >                 <Type>PID</Type>
> >                 <Signal><![CDATA[Parameter
> Identifiers Supported - $01
> > to $20]]></Signal>
> >                 <Description><![CDATA[This
> PID indicates which
> > legislated PIDs]]></Description>
> >                  ..............
> >                  ...............
> > 
> > Can anyone please tell me how to get content of
> <Signal> tag.. that is,
> > how to extract the data "![CDATA[Parameter
> Identifiers Supported - $01
> > to $20]]"
> > 
> > Thanks,
> > Girish...
> 
> The easy one is to use re module (Regular expression). 
> 
> # untested
> import re
> signal_pattern =
> re.compile('<Signal>(.*)</Signal>')
> signals = signal_pattern.findall(xmlstring)
> 
> also, you may also use the xml module, which will be more
> reliable if you 
> have data like this: <foo
> attr="<Signal>blooo</Signal>">blah</foo>,
> 
> >>> import xml.dom.minidom
> >>> xmldata =
> xml.dom.minidom.parse(open('myfile.xml'))
> >>> for node in
> xmldata.getElementsByTagName('Signal'): print
> node.toxml()
> ... 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From jason.scheirer at gmail.com  Wed Feb 25 01:38:48 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 22:38:48 -0800 (PST)
Subject: Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
References: <mailman.712.1235541324.11746.python-list@python.org>
Message-ID: <134f4359-2b76-4295-aaeb-191c937fc515@l16g2000yqo.googlegroups.com>

On Feb 25, 12:55?am, Shah Sultan Alam <ssa... at gmail.com> wrote:
> Hi Groups,
> ?Can you please help me on the following...
>
> 1. Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
>
> 2. If yes, what is the exact 'yum' command to install paramiko on CentOS 4?
> I have tried all possible ones without success.
>
> ? ? ? ? yum install paramiko
> ? ? ? ? yum install python-paramiko(with and without version numbers)
> ? ? ? ? python-paramiko.noarch
>
> Installing it without yum throws dependency problems which are never
> ending : starting with python-crypto and python(abi) - which I am
> unable to find.
>
> Is there any change that has to be made to the yum repository to point
> it to look in a different place?
>
> 3. Alternatively, I also have apt-get on the CentOS box - can you tell
> me some repos that I can add for apt-get as well?
>
> Regds
> Shah

This may be a question better directed at the CentOS mailing list as I
doubt anyone here is a CentOS package maintainer for paramiko. You're
going to need to build it yourself if it's not in yum. Make sure you
have the python development headers installed, and issue the commands:

wget http://www.lag.net/paramiko/download/paramiko-1.7.4.tar.gz
tar xzf paramiko-1.7.4.tar.gz
cd paramiko-1.7.4
python setup.py build
su -c "python setup.py install"

Alternately, you can issue

python setup.py bdist_rpm

to get an RPM you can install on other machines as well (it will show
up in the ./dist/ directory relative to setup.py). Good luck.


From lie.1296 at gmail.com  Wed Feb 25 01:48:30 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 17:48:30 +1100
Subject: XML Parsing
In-Reply-To: <498059.69062.qm@web27404.mail.ukl.yahoo.com>
References: <498059.69062.qm@web27404.mail.ukl.yahoo.com>
Message-ID: <1235544510.6745.8.camel@lieryan-laptop>

On Wed, 2009-02-25 at 06:09 +0000, hrishy wrote:
> Hi 
> 
> I am just a python enthusiast and not a python user but was just wundering why didnt the list members come up with or recommen XPATH based solution
> which i think is very elegant for this type of a problem isnt it ?

Did you mean XQuery?

Depending on the need, XQuery might be an overkill. And don't forget
that XQuery is still an obscure, unknown language for most people (the
de facto standard for querying is still SQL).



From jason.scheirer at gmail.com  Wed Feb 25 01:49:19 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 22:49:19 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together 
	on same *WINDOWS* machine
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
	<mailman.707.1235537518.11746.python-list@python.org>
	<49A4D50B.4030803@v.loewis.de>
Message-ID: <61420eb1-c8a6-4651-b8f0-83b9de81a749@q9g2000yqc.googlegroups.com>

On Feb 24, 9:20?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > It's easy - the registry isn't used except to associate files. The
> > associations are made with the most-recently-installed version.
>
> > I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.
>
> In addition, at install time, there is the choice of not creating
> associations (i.e. links what interpreter should be invoked if you
> double-click a .py file, and what version of IDLE should start
> when you select Edit from the context menu).
>
> So if you install 2.6 first, then 3.0, but deselect the installation
> of associations, 2.6 will continue to be associated with the
> .py, .pyw, and .pyc extensions.
>
> Regards,
> Martin

Technically not true. Python DOES use the registry, but it's per-
version and isolated from each other. Each installs some configuration
data in HKEY_LOCAL_MACHINE\\Software\Python\PythonCore\MAJOR.MINOR, so
you'll have stuff in HKLM\\Software\Python\PythonCore\2.6 and HKLM\
\Software\Python\PythonCore\3.0. And yes, this DOES mean you can't
have 2.6 and 2.6.1 cleanly installed on the machine at the same time.

As long as you keep your .py and .pyw files associated with the
preferred Python interpreter (2.6 I'm assuming) and EXPLICTLY call C:
\Python30\Python.exe when you want to run on 3.0, you're golden.


From venutaurus539 at gmail.com  Wed Feb 25 02:10:37 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 23:10:37 -0800 (PST)
Subject: Finding the attributes of a file
Message-ID: <08b7c6a1-0de0-4aa7-b1c7-6fb30013aa5d@e24g2000vbe.googlegroups.com>

Hello all,
           I am writing an application which has to identify the
archived files in a given directory.I've tried using the function
i = win32api.GetFileAttributes (full_path)

to obtain the attributes.But am unable to identify based on the value
it returns as it is returning 5152, 13856 etc for different files but
all of them are archived. Is there any way to come to a conclusion
using these numbers about whether a file is archived or not.

Thanks in advance,
Venu



From hrishys at yahoo.co.uk  Wed Feb 25 02:17:30 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 07:17:30 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <1235544510.6745.8.camel@lieryan-laptop>
Message-ID: <574132.90483.qm@web27405.mail.ukl.yahoo.com>

Hi 

Something like this

<pids
  <Parameter_Class
    <ParameterId="pid_031605_093137_283"             
    <Identifier$0000</Identifier
    <TypePID</Type
    <Signal<![CDATA[Parameter
 		Identifiers Supported - $01
  		to $20]]</Signal
   <Description<![CDATA[This PID indicates which
  legislated PIDs]]
   </Description

from elementtree.ElementTree import ElementTree
doc = ElementTree(file='tst.xml')
for e in mydata.findall('/pids//signal'):
    print e.get('title').text

Note i am not a python programmer just a enthusiast and i was curious why people on the list didnt suggest a code like above

willing to hear and learn from experienced python gurus

regards
Hrishy


      


From mail at microcorp.co.za  Wed Feb 25 02:19:43 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 25 Feb 2009 09:19:43 +0200
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com><gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com><gnv6vs$bm7$1@ger.gmane.org>
	<op.uptzhjvya8ncjz@gnudebst>
Message-ID: <00c101c9971c$8f1709e0$0d00a8c0@hendrik>

"Rhodri James" <rh..i at wi......mon.co.uk> wrote:

> A souq is a bazaar :-)
> 
> Well, close enough anyway.  It's another arabic word that translates as
> "market" in both the mercantile and financial senses, I believe.  Maybe
> I've just read too much arabic-themed fiction, but I was surprised not
> to find the word in my trusty Chambers.

I seem to remember seeing the word being variously spelled "suq" 
and/or "suk".

- Hendrik




From lie.1296 at gmail.com  Wed Feb 25 02:33:14 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 07:33:14 +0000 (UTC)
Subject: XML Parsing
References: <1235544510.6745.8.camel@lieryan-laptop>
	<574132.90483.qm@web27405.mail.ukl.yahoo.com>
Message-ID: <go2s7q$1e1$1@ger.gmane.org>

Are you searching for answer or searching for another people that have 
the same answer as you? :)

"Many roads lead to Rome" is a very famous quotation...



From gregory.matous at gmail.com  Wed Feb 25 02:34:21 2009
From: gregory.matous at gmail.com (Dutch Masters)
Date: Tue, 24 Feb 2009 23:34:21 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together 
	on same *WINDOWS* machine
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
Message-ID: <18b6c7ce-02db-498b-886d-0b811fb51e2e@v13g2000vbb.googlegroups.com>

There is some documentation on the subject at:

http://docs.python.org/using/windows.html

In general, there are several options in maintaining separate
environments:

1) Create a separate user for each environment. This allows you to
keep things such as Path and file associations so that you are
selecting a certain install whenever you are logged in as that user.
This may NOT be an option on Vista though. The Python installer will
tell you whether you can install for only the current user.

2) Use batch scripts to setup your PATH and PYTHONPATH. This will not
solve the file association problem, but you can probably set up your
"SEND TO" folder to handle the different versions.

3) Use something like virtualenv.

I'm using option 2).

A couple more hints: if you are using a windows installer for a third-
party lib, (like wxpython), the installer will look in the registry
for a matching python installation. If there isn't one, it shouldn't
be a problem, just install it where it needs to go. (in the
appropriate Python folder).

You can also use the repair option for the python installer to get the
registry set up for a particular install. For example, if you
installed Python 3, but want to then use associations with 2.6, just
use repair with the 2.6 installer. (Not sure what else repair does
though)

Finally, you can use the --prefix option to setup.py to get installs
to go where you want on win.




From sjmachin at lexicon.net  Wed Feb 25 02:37:24 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 23:37:24 -0800 (PST)
Subject: Finding the attributes of a file
References: <08b7c6a1-0de0-4aa7-b1c7-6fb30013aa5d@e24g2000vbe.googlegroups.com>
Message-ID: <8d4fef20-97d2-4e6b-82aa-fbb125ae41b8@h5g2000yqh.googlegroups.com>

On Feb 25, 6:10?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> Hello all,
> ? ? ? ? ? ?I am writing an application which has to identify the
> archived files in a given directory.I've tried using the function
> i = win32api.GetFileAttributes (full_path)
>
> to obtain the attributes.But am unable to identify based on the value
> it returns as it is returning 5152, 13856 etc for different files but
> all of them are archived. Is there any way to come to a conclusion
> using these numbers about whether a file is archived or not.

Two questions:
(1) What didn't you understand on the MSDN page that comes up when you
fed "GetFileAttributes" into your googler and selected the first hit?

"""
The attributes can be one or more of the following values.
Return code/value	Description

[... and the very first one is ...]

FILE_ATTRIBUTE_ARCHIVE
320x20

A file or directory that is an archive file or directory.

Applications use this attribute to mark files for backup or removal.
"""

Sure it slows you down slightly by having to mentally insert the
missing space in "320x20", but sheeeeesh it's not that hard to find.

(2) Where did you get the idea that this bit means archivED (i.e
completed, past tense)? AFAIK it's always been documented the MSDN
page says, with a hopeful or future-tense meaning. Of course as long
as the setters of the bit and the getters of the bit are using the
same protocol, it's not a problem ... could be a bit of a problem
ensuring you know who all the getters and setters are, and ensuring
that they are under your control.

HTH,

John


From venutaurus539 at gmail.com  Wed Feb 25 02:40:22 2009
From: venutaurus539 at gmail.com (venu madhav)
Date: Wed, 25 Feb 2009 13:10:22 +0530
Subject: Problem in identifying an archived file in Windows
Message-ID: <daf1e02e0902242340ue410fa3oabb4c927d20872a5@mail.gmail.com>

Hello all,
           I am writing an application which has to identify the
archived files in a given directory.I've tried using the function
i = win32api.GetFileAttributes (full_path)

to obtain the attributes.But am unable to identify based on the value
it returns as it is returning 5152, 13856 etc for different files but
all of them are archived. Is there any way to come to a conclusion
using these numbers about whether a file is archived or not.

Thanks in advance,
Venu
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From kom2 at centrum.cz  Wed Feb 25 02:50:27 2009
From: kom2 at centrum.cz (Kom2)
Date: Tue, 24 Feb 2009 23:50:27 -0800 (PST)
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
	<73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>
	<mailman.666.1235485570.11746.python-list@python.org>
Message-ID: <6706d803-243d-4e28-8ef0-9aa37b59c0b6@o11g2000yql.googlegroups.com>

On 24 ?n, 15:25, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 23 Feb 2009 05:51:27 -0200, Kom2 <k... at centrum.cz> escribi?:
>
>
>
> > On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
> >> Kom2 wrote:
> >> > Hello,
> >> > I'm trying to convert my project from python 2.5 to python 3.0 and I
> >> > have the following problem. My project is PYD library written in C++.
> >> > So I have this PyInit_ModuleName function containing PyModule_Create
> >> > call and this function also call some script with declarations:
>
> >> > ? ?PyObject* m;
>
> >> > ? ?m = PyModule_Create(&PyVRDAModule);
> >> > ? ?if (m == NULL) {
> >> > ? ? ? return NULL;
> >> > ? ?}
> >> > ? ?PyObject *d, *v;
> >> > ? ?d = PyModule_GetDict(m);
> >> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> >> > d, NULL);
> >> > ? ?......
>
> >> > txtPyPredefinedConstants is string with this content:
>
> >> > class CursorMoveType:
> >> > ? ?First = 0
> >> > ? ?Last = 1
> >> > ? ?Next = 2
> >> > ? ?Previous = 3
> >> > ? ?Bookmark = 4
> >> > ? ?NewRecord = 5
>
> >> > In Python 2.5 everything works fine, now in python3.0
> >> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
> >> > found".
>
> __build_class__ is a (hidden?) function in the builtins module.
> Your module isn't completely created yet, it lacks the __builtins__ ?
> attribute, so you can't execute any Python code that calls a builtin ?
> function. In 2.5 the class statement was a lot simpler, but in 3.0 it ?
> requires an auxiliary function (implemented as builtins.__build_class__)
> You may try setting __builtins__ to the current builtins ?
> (PyEval_GetBuiltins) before executing Python code.
> Or, if those 7 lines are all you need, you may just write the equivalent C ?
> code.
>
> --
> Gabriel Genellina

Thanks for answer, calling PyEval_GetBuiltins could also help.
I solved this issue by getting dictionary of __main__ module as global
dictionary -

   d = PyModule_GetDict(m);
   PyObject* glMod = PyImport_AddModule("__main__");
   if (glMod == NULL) {
      return NULL;
   }
   PyObject* glDict = PyModule_GetDict(glMod);
   v = PyRun_StringFlags(txtPyPredefinedConstants, Py_file_input,
glDict, d, NULL);

- and it works.


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 25 02:50:49 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Feb 2009 07:50:49 GMT
Subject: =?windows-1251?q?Re=3A_'u'__Obselete_type_=96?= it is identical to
	'd'.  (7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.25.07.50.50@REMOVE.THIS.cybersource.com.au>

On Tue, 24 Feb 2009 15:04:05 -0800, John Machin wrote:


>> I don't know what you want to report, but I've reported that obsolete
>> is mispelled:
>>
>> http://bugs.python.org/issue5361
> 
> +1 Own Goal of the Year ... see
>  http://www.yourdictionary.com/library/misspelled.html

Oh come on, it's hardly the Own Goal of the Year if it's in the (quote) 
"100 Most Often Misspelled Words in English". A notable own goal would be 
if I misspelled my own name or something. What I did was a run-of-the-
mill ordinary own goal, hardly worth even noting.

Besides, it's just the Time Machine in action. Come back in 10 years, and 
I bet "mispelled" will be accepted as a legitimate variant, just like 
inflammable/flammable, and in another 20 years, it will be the preferred 
spelling. The process is well on the way according to Google:

Results 1 - 10 of about 4,850,000 for mispelled
Results 1 - 10 of about 4,560,000 for misspelled



Typo'ly y'rs - Stveen

*wink*


From david.birdsong at gmail.com  Wed Feb 25 02:52:23 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 23:52:23 -0800 (PST)
Subject: single thread decrement a semaphore object more than once?
References: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
	<mailman.709.1235538009.11746.python-list@python.org>
Message-ID: <11e41a9d-11be-4708-b47c-553ccab2e08d@t13g2000yqc.googlegroups.com>

On Feb 24, 8:57?pm, Christian Heimes <li... at cheimes.de> wrote:
> birdsong wrote:
> > I searched but didn't see this already discussed, sorry if I didn't
> > search hard enough.
>
> > Can I decrement a semaphore's counter within the same thread more than
> > once? ?I'd like to set hard and soft limits in a server I'm writing.
> > The server upon initialization would create a semaphore:
>
> > threading.Semaphore(100)
>
> Yes, you are not restricted to multiple threads. A semaphore ensures
> that the counter is thread safe. It doesn't force you to use threads.
>
> Christian

ahh good. there will be multiple threads accessing, but yes i follow
now.  i guess this would have been pretty easy to test in the shell.

muchas gracias.


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 03:19:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 06:19:19 -0200
Subject: Problem in identifying an archived file in Windows
References: <daf1e02e0902242340ue410fa3oabb4c927d20872a5@mail.gmail.com>
Message-ID: <op.upweqhnpx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 05:40:22 -0200, venu madhav <venutaurus539 at gmail.com>  
escribi?:

>            I am writing an application which has to identify the
> archived files in a given directory.I've tried using the function
> i = win32api.GetFileAttributes (full_path)
>
> to obtain the attributes.But am unable to identify based on the value
> it returns as it is returning 5152, 13856 etc for different files but
> all of them are archived. Is there any way to come to a conclusion
> using these numbers about whether a file is archived or not.

So you're using the pywin32 package. It comes with a help file  
(PyWin32.chm), you can open it right from the menu: Start, All Programs,  
Python XX, Python for Windows documentation.
Go to the GetFileAttributes topic. It says "The return value is a  
combination of the win32con.FILE_ATTRIBUTE_* constants". Ok, which  
constants? Let Python tell us:

py> import win32con
py> [name for name in dir(win32con) if name.startswith("FILE_ATTRIBUTE_")]
['FILE_ATTRIBUTE_ARCHIVE', 'FILE_ATTRIBUTE_ATOMIC_WRITE',  
'FILE_ATTRIBUTE_COMPRESSED', 'FILE_ATTRIBUTE_DIRECTORY',  
'FILE_ATTRIBUTE_HIDDEN', 'FILE_ATTRIBUTE_NORMAL',  
'FILE_ATTRIBUTE_READONLY','FILE_ATTRIBUTE_SYSTEM',  
'FILE_ATTRIBUTE_TEMPORARY', 'FILE_ATTRIBUTE_XACTION_WRITE']

What do they mean? The best source is the Microsoft site. There is a very  
convenient link in the help topic: "Search for GetFileAttributes at msdn,  
google or google groups." Click on msdn, the first result is  
<http://msdn.microsoft.com/en-us/library/aa364944(VS.85).aspx>
You apparently are looking for FILE_ATTRIBUTE_ARCHIVE.

-- 
Gabriel Genellina



From hrishys at yahoo.co.uk  Wed Feb 25 03:20:20 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 08:20:20 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <go2s7q$1e1$1@ger.gmane.org>
Message-ID: <581368.29674.qm@web27405.mail.ukl.yahoo.com>

Hi Lie

I am not a python guy but very interested in the langauge and i consider the people on this list to be intelligent and was wundering why you people did not suggest xpath for this kind of a problem just curious and willing to learn.

I am searching for a answer but the question is 
why not use xpath to extract xml text from a xml doc ?

regards
Hrishy


--- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:

> From: Lie Ryan <lie.1296 at gmail.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 7:33 AM
> Are you searching for answer or searching for another people
> that have 
> the same answer as you? :)
> 
> "Many roads lead to Rome" is a very famous
> quotation...
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 03:45:23 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 09:45:23 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.7174.1231915778.3487.python-list@python.org>
References: <mailman.7174.1231915778.3487.python-list@python.org>
Message-ID: <49a50517$0$3567$426a74cc@news.free.fr>

Brendan Miller a ?crit :
> PEP 8 doesn't mention anything about using all caps to indicate a constant.
> 
> Is all caps meaning "don't reassign this var" a strong enough
> convention to not be considered violating good python style? I see a
> lot of people using it, but I also see a lot of people writing
> non-pythonic code... so I thought I'd see what the consensus is.

Most - if not all - of the python code I've seen so far used this 
convention, and I always used (and respected) it myself.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 03:48:27 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 09:48:27 +0100
Subject: pep 8 constants
In-Reply-To: <87fxje4lqh.fsf@benfinney.id.au>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7578.1232421082.3487.python-list@python.org>
	<pan.2009.01.20.04.03.05@REMOVE.THIS.cybersource.com.au>
	<87fxje4lqh.fsf@benfinney.id.au>
Message-ID: <49a505cf$0$3567$426a74cc@news.free.fr>

Ben Finney a ?crit :
(snip - about using ALL_CAPS for pseudo-constants)
> Perhaps I'd even
> argue for an update to PEP 8 that endorses this as conventional.

+1

I've been a bit surprised last time I checked PEP8 to find out this 
wasn't already the case - I would have sweared it was.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 04:03:17 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 10:03:17 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.7757.1232658369.3487.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7757.1232658369.3487.python-list@python.org>
Message-ID: <49a50949$0$3556$426a34cc@news.free.fr>

Brian Allen Vanderburg II a ?crit :
> bockman at virgilio.it wrote:
>> Constants would be a nice addition in python, sure enough.
>> But I'm not sure that this can be done without a run-time check every 
>> time
>> the constant is used, and python is already slow enough. Maybe a check
>> that is disabled when running with optimizing flags ?
>>
>> But I'm sure this discussion has been already made and the FINAL WORD has
>> been already spoken.
>>
>>   
> One idea to make constants possible would be to extend properties to be 
> able to exist at the module level as well as the class level:
> 
> @property
> def pi():
>    return 3.14159.....
> 
> print(pi) # prints 3.14159....
> pi=32 # Raise an error Cannot set attribute ...
> 

There are a couple problems with this suggestion:

- it would require modifying lookup rules to allow the protocol 
descriptor to be invoked on instance attributes[1] - which is not 
actually the case, by design.

- it adds the overhead of a method and a function call for what is 
mostly a simple "constant" attribute lookup.

FWIW, while it would already work for class-level pseudo-constants 
(using a very simple custom descriptor), I'd qualify such usage as a WTF.



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 04:07:00 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 10:07:00 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.702.1235532187.11746.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>
	<mailman.702.1235532187.11746.python-list@python.org>
Message-ID: <49a50a28$0$25565$426a34cc@news.free.fr>

Ethan Furman a ?crit :
> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
(snip)
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>
>> I don't understand why this would print 3.14159 ... instead of <function
>> __math__.pi>, or whatever.
>>
>> property would clearly have to do something very different in module
>> scope in order to make this work.
>>
> 
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
> 
> Looks like that's how property works, so the same behavior on a module 
> level would do as Brian suggests.

s/module/instance/

At runtime, modules are instances of the module type - so 'module-level' 
names are really instance attributes of the module instance -, and the 
descriptor protocol is only invoked for class attributes.


From jarausch at igpm.rwth-aachen.de  Wed Feb 25 04:16:38 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 10:16:38 +0100
Subject: variable length tuple assignment
Message-ID: <70kgjnFbqktdU1@mid.dfncis.de>

Sorry if this is too simple but I couldn't find.

I vaguely remember there is a means to assign a variable length tuple
and catch the 'rest'  like

S="a,b,c,d"

(A,B,<list of remaining items>) = S.split(',')

I know I could do
SL= split(',')
(A,B)=SL[:2]
Rest= SL[2:]

but is there some shorthand for this?

Many thanks for a hint,

Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From mathieu.malaterre at gmail.com  Wed Feb 25 04:26:58 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Wed, 25 Feb 2009 01:26:58 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
Message-ID: <adf71b9f-38ae-4e86-9978-41c61709f348@t7g2000yqa.googlegroups.com>

On Feb 24, 11:06 pm, Steven D'Aprano <st... at pearwood.info> wrote:
> mathieu wrote:
> > I did not know where to report that:
>
> > 'u'   Obselete type ? it is identical to 'd'.         (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> > Thanks
>
> If you google on "python bug tracker" the first link is the correct one.
>
> I don't know what you want to report, but I've reported that obsolete is
> mispelled:
>
> http://bugs.python.org/issue5361

Thanks. Now I know :)


From mathieu.malaterre at gmail.com  Wed Feb 25 04:27:39 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Wed, 25 Feb 2009 01:27:39 -0800 (PST)
Subject: =?windows-1252?B?UmU6ICd1JyBPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gKDc=?=
	=?windows-1252?B?KQ==?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<31fa575a-cc0d-4830-ae23-0a784fa3361f@13g2000yql.googlegroups.com>
Message-ID: <93018776-530b-43b3-b728-e593d8ccbb97@x38g2000yqj.googlegroups.com>

On Feb 24, 9:24 pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 25, 4:48 am, mathieu <mathieu.malate... at gmail.com> wrote:
>
> > I did not know where to report that:
>
> > 'u'     Obselete type ? it is identical to 'd'.       (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> So what's your problem with that? Do you believe that 'u' is not
> accepted? That 'u' is not identical to 'd' and thus the doc should be
> rewritten as "its behaviour is identical to that of 'd'"? That the
> behaviour of 'u' is NOT identical to that of 'd'? That 'u' should not
> be documented? That 'u' should not be described as obselete?
                                                     ^^^^^^^^

lol :)


From clp2 at rebertia.com  Wed Feb 25 04:41:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 25 Feb 2009 01:41:54 -0800
Subject: variable length tuple assignment
In-Reply-To: <70kgjnFbqktdU1@mid.dfncis.de>
References: <70kgjnFbqktdU1@mid.dfncis.de>
Message-ID: <50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>

On Wed, Feb 25, 2009 at 1:16 AM, Helmut Jarausch
<jarausch at igpm.rwth-aachen.de> wrote:
> Sorry if this is too simple but I couldn't find.
>
> I vaguely remember there is a means to assign a variable length tuple
> and catch the 'rest' ?like
>
> S="a,b,c,d"
>
> (A,B,<list of remaining items>) = S.split(',')

In Python 3.0 (IIRC):

A, B, *rest = S.split(',')

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From robin at reportlab.com  Wed Feb 25 05:07:24 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 25 Feb 2009 10:07:24 +0000
Subject: pep 8 constants
In-Reply-To: <49a50a28$0$25565$426a34cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>
	<49a50a28$0$25565$426a34cc@news.free.fr>
Message-ID: <49A5185C.9080906@chamonix.reportlab.co.uk>

well this sort of awful hackery will allow you to put read only constants on an 
existing module

 >>> import reportlab
 >>> reportlab.__class__
 >>> class MyModule(reportlab.__class__):
... 	@property
... 	def pi(self):
... 		return 3
...
 >>> z=MyModule('reportlab')
 >>> z.__dict__.update(reportlab.__dict__)
 >>> z.pi
3
 >>> import sys
 >>> sys.modules['reportlab']=z
 >>> del reportlab
 >>> import reportlab
 >>> reportlab.pi
3
 >>> reportlab.pi=4
Traceback (most recent call last):
   File "<interactive input>", line 1, in <module>
AttributeError: can't set attribute
 >>>

so I guess if you write your own module class and then use a special importer 
you can create module like objects with read only attributes.


-- 
Robin Becker



From rogerb at rogerbinns.com  Wed Feb 25 05:09:10 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Wed, 25 Feb 2009 02:09:10 -0800
Subject: Is there a way to increase memory allocated to the python
	interpreter
In-Reply-To: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>
References: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>
Message-ID: <go35c7$3ji$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

janandith jayawardena wrote:
> Is there a way to configure the amount of memory allocated to the python
> interpreter.  Can it be increased or decreased using an argument like in
> the Java Virtual Machine.

Java needs the memory allocation number because of the way garbage
collection is done (or at least used to be done).  The CPython
interpreter doesn't have an explicit limit and will use all the address
space the operating system will let it have as needed.  (That typically
works out as around 2GB for a 32 bit process and exhausting swap space
on a 64 bit process).

If you want to prevent using more than a certain amount, then use
functionality provided by your operating system.  On Unix/Linux systems
the ulimit command will do the trick.

Roger
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Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkmlGMMACgkQmOOfHg372QQeMACfVhyccV91nU0WZswc2CNg8KMv
SlEAoMINnO48FoDp0vgxROOWAjYp2tPG
=Vjcf
-----END PGP SIGNATURE-----



From rogerb at rogerbinns.com  Wed Feb 25 05:11:38 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Wed, 25 Feb 2009 02:11:38 -0800
Subject: Unix Change Passwd Python CGI
In-Reply-To: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
References: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
Message-ID: <go35gq$3ji$2@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Derek Tracy wrote:
> Apache is running on the same system that needs the password changed.  I
> need to keep security high and can not install additional modules at
> this time.
> 
> I just need a general direction to start looking, and I do not have
> expect installed on the system.

I recommend looking in the Samba source code where they have a program
that does just that.

Roger
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkmlGVcACgkQmOOfHg372QTZHACdFG0+Ls2Su/jRqkc4YZyxXK35
N7AAoNKfd7bMypR7b6Ex6auaU/9D4rKa
=POal
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From wongo888 at gmail.com  Wed Feb 25 05:17:33 2009
From: wongo888 at gmail.com (wongobongo)
Date: Wed, 25 Feb 2009 02:17:33 -0800 (PST)
Subject: Python Image Library IOError - cannot find JPEG decoder?
References: <mailman.674.1235496906.11746.python-list@python.org>
Message-ID: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>

On Feb 24, 9:34?am, Dario Traverso <traver... at gmail.com> wrote:
> I've been trying to install the Python Image Library ?(PIL) on my Mac ?
> OSX Leopard laptop, but have been running into some difficulties.
>
> I've built the library, using the included setup.py ?script. The build ?
> summary checks out ok, and sounds the option libraries to all be ?
> found. I grabbed both libjpeg and freetype2 ?using ?fink.
>
> --------------------------------------------------------------------
> PIL 1.1.6 BUILD SUMMARY
> --------------------------------------------------------------------
> version ? ? ? 1.1.6
> platform ? ? ?darwin 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
> ? ? ? ? ? ? ? [GCC 4.0.1 (Apple Inc. build 5465)]
> --------------------------------------------------------------------
> --- TKINTER support ok
> --- JPEG support ok
> --- ZLIB (PNG/ZIP) support ok
> --- FREETYPE2 support ok
> --------------------------------------------------------------------
>
> However, ?I then run the included self test, and 1 out of 57 tests ?
> fails. I receive an IOError. Specifically:
>
> *****************************************************************
> Failure in example: _info(Image.open("Images/lena.jpg"))
> from line #24 of selftest.testimage
> Exception raised:
> Traceback (most recent call last):
> ? File "./doctest.py", line 499, in _run_examples_inner
> ? ? exec compile(source, "<string>", "single") in globs
> ? File "<string>", line 1, in <module>
> ? File "./selftest.py", line 22, in _info
> ? ? im.load()
> ? File "PIL/ImageFile.py", line 180, in load
> ? ? d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
> ? File "PIL/Image.py", line 375, in _getdecoder
> ? ? raise IOError("decoder %s not available" % decoder_name)
> IOError: decoder jpeg not available
> 1 items had failures:
> ? ?1 of ?57 in selftest.testimage
> ***Test Failed*** 1 failures.
> *** 1 tests of 57 failed.
>
> I've followed all of the installation instructions exactly. The build ?
> summary reported everything was "ok". What could be the problem here. ?
> Libjpeg-6b ?is not accessible?
>
> Thank you for any insight you can provide!!
>
> -Dario


That would be my guess.

Two things you may want to try:

1. Check that your Fink libraries and headers were used to make your
PIL (check -I and -L settings on gcc after doing "python setup.py
build_ext -i"). They should point to your Fink lib and include dirs.
2. Line 372 in PIL/Image.py has a debug print line. Try uncommenting
that and see what comes out.

That might give you some clues as to what is going on. You can always
just call up Python in a terminal and try it out (from selftest.py
doctests beginning on line 29).

>>> import Image
>>> def _info(im):
...    im.load()
...    return im.format, im.mode, im.size
>>> im = Image.new("1", (128, 128))
>>> _info(im)
(None, '1', (128, 128))



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 05:31:23 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 11:31:23 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.722.1235556464.11746.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>	<49a50a28$0$25565$426a34cc@news.free.fr>
	<mailman.722.1235556464.11746.python-list@python.org>
Message-ID: <49a51def$0$20681$426a74cc@news.free.fr>

Robin Becker a ?crit :
> well this sort of awful hackery will allow you to put read only 
> constants on an existing module
> 
(snip example code)
> 
> so I guess if you write your own module class and then use a special 
> importer you can create module like objects with read only attributes.
> 

Fine technical solution. But, err, isn't all this a bit overkill for 
something that can easily be handled by a simple convention ?-)



From gonsolo at gmail.com  Wed Feb 25 05:36:05 2009
From: gonsolo at gmail.com (Gonsolo)
Date: Wed, 25 Feb 2009 02:36:05 -0800 (PST)
Subject: H-Index with Google Scholar
Message-ID: <d20dd2ba-6ba8-457e-9eb7-0312f9d955c2@v19g2000yqn.googlegroups.com>

I wrote a small script to compute the H-Index of an author.
It is modeled after activestate's google search:
http://code.activestate.com/recipes/523047/

Example use:
hindex i daubechies
Result:
49

The script:

#!/usr/bin/python

import httplib, urllib, re, sys
from BeautifulSoup import BeautifulSoup

terms = sys.argv[1:]
limit = 100
params = urllib.urlencode( { 'q': "+".join( terms ), 'num': limit } )
headers = {'User-Agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
NT)'}
url = '/scholar'+"?"+params
conn = httplib.HTTPConnection( 'scholar.google.com' )
conn.request( "GET", url, {}, headers )

resp = conn.getresponse()
cites = []
if resp.status == 200:
	html = resp.read()
	html = html.decode( 'ascii', 'ignore' )
	soup = BeautifulSoup( html )
	for record in soup( 'p', { 'class': 'g' } ):
		match = re.search("Cited by ([^<]*)", str(record))
		if match != None:
			cite = int( match.group( 1 ) )
			cites.append( cite )
else:
	print 'Error: '
	print resp.status, resp.reason

cites.sort()
cites.reverse()

h = 0
for cite in cites:
	if cite > h:
		h += 1
print h


From robin at reportlab.com  Wed Feb 25 05:56:04 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 25 Feb 2009 10:56:04 +0000
Subject: pep 8 constants
In-Reply-To: <49a51def$0$20681$426a74cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>	<49a50a28$0$25565$426a34cc@news.free.fr>	<mailman.722.1235556464.11746.python-list@python.org>
	<49a51def$0$20681$426a74cc@news.free.fr>
Message-ID: <49A523C4.7030104@chamonix.reportlab.co.uk>

Bruno Desthuilliers wrote:
> Robin Becker a ?crit :
>> well this sort of awful hackery will allow you to put read only 
>> constants on an existing module
>>
> (snip example code)
>>
>> so I guess if you write your own module class and then use a special 
>> importer you can create module like objects with read only attributes.
>>
> 
> Fine technical solution. But, err, isn't all this a bit overkill for 
> something that can easily be handled by a simple convention ?-)
......
no dispute about that :)
-- 
Robin Becker



From nick_keighley_nospam at hotmail.com  Wed Feb 25 06:24:07 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Wed, 25 Feb 2009 03:24:07 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<ea052d08-0621-4281-ad47-f6705f7e289d@f24g2000vbf.googlegroups.com>
Message-ID: <a890a04f-f837-4e1d-a372-0758acb02d8f@c11g2000yqj.googlegroups.com>

On 24 Feb, 15:00, nick_keighley_nos... at hotmail.com wrote:
> On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:

> > Here's a interesting toy problem posted by Drew Krause to
> > comp.lang.lisp:
>
> > ------------------------
> > On Jan 16, 2:29 pm, Drew Krause wrote [paraphrased a bit]:
>
> > OK, I want to create a nested list in Lisp (always of only integers)
> > from a text file, such that each line in the text file would be
> > represented as a sublist in the 'imported' list.
>
> > example of a file's content
>
> > 3 10 2
> > 4 1
> > 11 18
>
> > example of programing behavior
> > (make-list-from-text "blob.txt") => ((3 10 2) (4 1) (11 18))

<snip>

> scheme:
>
> (define (read-line port)
> ? ? (define (rec-read-line port line)
> ? ? ? ? (define next-char (peek-char port))
> ? ? ? ? (define number #f)
> ? ? ? ? (cond ((eof-object? next-char) '())
> ? ? ? ? ? ? ? ((char=? next-char #\newline) (read-char port) line)
> ? ? ? ? ? ? ? ((char-numeric? next-char)
> ? ? ? ? ? ? ? ? ? ?(set! number (read port))
> ? ? ? ? ? ? ? ? ? ?(cons number (rec-read-line port line)))
> ? ? ? ? ? ? ? ((char=? next-char #\space)
> ? ? ? ? ? ? ? ? ? ?(read-char port)
> ? ? ? ? ? ? ? ? ? ?(rec-read-line port line))
> ? ? ? ? ? ? ? (else (error (string-append "bad character \""
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (string next-char) "\"")))
> ? ? ))
>
> ? ? (rec-read-line port '())
> )
>
> (define (make-int-list port)
> ? ? (define line (read-line port))
> ? ? (if (null? line)
> ? ? ? ? '()
> ? ? ? ? (cons line (make-int-list port))))
>
> (define (make-list-from-text file)
> ? ? (make-int-list (open-input-file file)))

an assignment-free version

(define (read-line port)
    (define (rec-read-line port line)
        (let ((next-char (peek-char port)))
            (cond ((eof-object? next-char) '())
                  ((char=? next-char #\newline) (read-char port) line)
                  ((char-numeric? next-char)
                       (let ((number (read port)))
                           (cons number (rec-read-line port line))))
                  ((char=? next-char #\space)
                       (read-char port)
                       (rec-read-line port line))
                  (else (error (string-append "bad character \""
                                   (string next-char) "\""))))))

    (rec-read-line port '()))

(define (make-int-list port)
    (let ((line (read-line port)))
        (if (null? line)
            '()
            (cons line (make-int-list port)))))

(define (make-list-from-text file)
    (make-int-list (open-input-file file)))

(define (mk) (make-list-from-text "blob.txt"))

<snip>

number was originally define'd but I discovered there were
limits to where you could define things


From nick_keighley_nospam at hotmail.com  Wed Feb 25 06:34:33 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Wed, 25 Feb 2009 03:34:33 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
Message-ID: <c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com>

On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:
> comp.lang.lisp,comp.lang.scheme,comp.lang.functional,comp.lang.python,comp.?lang.ruby

<snip>

> The lisp's cons fundamentally makes nested list a pain to work with.
> Lisp's nested syntax makes functional sequencing cumbersome.

so hide it

(define (make-list stream eos?)
    (let ((atom (stream)))
        (if (eos? atom)
            '()
            (cons atom (make-list stream eos?)))))

(define (make-int-list port)
    (make-list (lambda () (read-line port)) null?))

the nasty cons then only appears in a single function which
you can hide in a library


> In the ruby code, its post-fix sequential notation (as a side effect
> of its OOP notation) brings out the beauty of functional sequencing
> paradigm (sometimes known as functional chain, sequencing, filtering,
> unix piping).
>
> its list, like all modern high level langs such as perl, php, python,
> javascript, don't have the lisp's cons problem. The cons destroys the
> usability of lists up-front, untill you have some at least 2 full-time
> years of coding lisp to utilize cons properly. (and even after that,
> it is still a pain to work with, and all you gain is a bit of speed
> optimization in rare cases that requires largish data, most of which
> has better solutions such as a database.)

is my code to build a list that bad?


> Both of these problems i've published articles on.
>
> For more detail on the cons problem, see
> the section ?The Cons Business? at
>
> ? Fundamental Problems of Lisp
> ?http://xahlee.org/UnixResource_dir/writ/lisp_problems.html

I read it. Your point seems to be "cons becomes difficult
with deeply nested structures". Could you give an example?


From python.list at tim.thechases.com  Wed Feb 25 06:35:06 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 25 Feb 2009 05:35:06 -0600
Subject: variable length tuple assignment
In-Reply-To: <50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
References: <70kgjnFbqktdU1@mid.dfncis.de>
	<50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
Message-ID: <49A52CEA.2000603@tim.thechases.com>

Chris Rebert wrote:
> On Wed, Feb 25, 2009 at 1:16 AM, Helmut Jarausch
> <jarausch at igpm.rwth-aachen.de> wrote:
>> Sorry if this is too simple but I couldn't find.
>>
>> I vaguely remember there is a means to assign a variable length tuple
>> and catch the 'rest'  like
>>
>> S="a,b,c,d"
>>
>> (A,B,<list of remaining items>) = S.split(',')
> 
> In Python 3.0 (IIRC):
> 
> A, B, *rest = S.split(',')

As an aside, as of the last time I read the PEP[1] on this, I 
believe it exhausts (or attempts to exhaust) any iterator.  IMHO, 
I think this exhausting is a bad idea because it prevents things like

   def numbers(start=0):
     i = start
     while True:
       yield i
       i += 1

   CONST_A, CONST_B, CONST_C, *rest = numbers()

which will hang in current Py3.0 until you blow a stack or 
overrun your heap somewhere because it will try to exhaust the 
infinite loop.  It also changes the type from iter() to list() 
for the remaining content (not as grevious).


I agree that the "internal star" usage needs to exhaust the iterator:

   A, *rest, C, D = s.split(',')

but the terminal-star syntax should be a little more gracious 
with iterators.

Anyways, my $0.02 (minus taxes, money for multiple bailouts, and 
deflated by economic conditions -- so not worth much :).

-tkc

[1]
http://www.python.org/dev/peps/pep-3132/








From jarausch at igpm.rwth-aachen.de  Wed Feb 25 07:21:03 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 13:21:03 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
Message-ID: <70krdfFc7rn0U1@mid.dfncis.de>

Hi,

I've just tried to write a simple example using PyCrypto's
AES (CBC mode)

#!/usr/bin/python
from Crypto.Cipher import AES

PWD='abcdefghijklmnop'
Initial16bytes='0123456789ABCDEF'

crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
# crypt = AES.new(PWD, AES.MODE_ECB)

txt = 'ea523a664dabaa4476d31226a1e3bab0'

c = crypt.encrypt(txt)

txt_plain=crypt.decrypt(c)

print txt_plain

Unfortunately, txt_plain differs from txt - why?
(Using MODE_ECB does work however)

What am I missing?

Many thanks for a hint,

Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From jarausch at igpm.rwth-aachen.de  Wed Feb 25 07:25:13 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 13:25:13 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
In-Reply-To: <70krdfFc7rn0U1@mid.dfncis.de>
References: <70krdfFc7rn0U1@mid.dfncis.de>
Message-ID: <70krl9Fbuqj5U1@mid.dfncis.de>

Helmut Jarausch wrote:
> Hi,
> 
> I've just tried to write a simple example using PyCrypto's
> AES (CBC mode)
> 
> #!/usr/bin/python
> from Crypto.Cipher import AES
> 
> PWD='abcdefghijklmnop'
> Initial16bytes='0123456789ABCDEF'
> 
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
> # crypt = AES.new(PWD, AES.MODE_ECB)
> 
> txt = 'ea523a664dabaa4476d31226a1e3bab0'
> 
> c = crypt.encrypt(txt)
> 
> txt_plain=crypt.decrypt(c)
> 
> print txt_plain
> 
> Unfortunately, txt_plain differs from txt - why?
> (Using MODE_ECB does work however)
> 

I just discovered that the following variant seems to work
crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
c = crypt.encrypt(txt)
crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes) # <<< re-initialize
txt_plain=crypt.decrypt(c)

So, the crypt object seems to keep some state.
I haven't seen this mentioned in the documentation.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From adisaurabh at gmail.com  Wed Feb 25 07:26:29 2009
From: adisaurabh at gmail.com (aditya saurabh)
Date: Wed, 25 Feb 2009 17:56:29 +0530
Subject: Lambda function
Message-ID: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>

I defined two functions - lets say
fa = lambda x: 2*x
fb = lambda x: 3*x
Now I would like to use fa*fb in terms of x
is there a way?
Thanks in advance
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From king.seth at gmail.com  Wed Feb 25 07:37:19 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 04:37:19 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
Message-ID: <f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>

On Feb 24, 10:55?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.s... at gmail.com> wrote:
> > I am just messing around trying to get pyserial to work with 3.0.
>
> > I am stuck on this line:
>
> > if type(port) in [type(''), type(u'')]
>
> > how can I convert this to 3.0? I tried changing the u to a d that did
> > not do anything.
>
> Looks like it's doing the equivalent of the pre-3.0-ism
> `isinstance(port, basestring)`, but in a roundabout way.
> However, since basestring doesn't exist in 3.0, either:
>
> if isinstance(port, str):
>
> Or
>
> if isinstance(port, bytes):
>
> would be the appropriate replacement. Depends (obviously) on whether
> 'port' is supposed to be unicode or a byte sequence.
> Without more context, I can't really say which is what you want.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

I implemented "if isinstance(port, str): " that seems to work for now.

Currently I am running into:

err, n = win32file.WriteFile(self.hComPort, data,
self._overlappedWrite)
TypeError: expected an object with a buffer interface

Thanks


From jcd at sdf.lonestar.org  Wed Feb 25 07:37:22 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Wed, 25 Feb 2009 07:37:22 -0500
Subject: XML Parsing
In-Reply-To: <581368.29674.qm@web27405.mail.ukl.yahoo.com>
References: <581368.29674.qm@web27405.mail.ukl.yahoo.com>
Message-ID: <1235565442.6046.2.camel@mctell>

Probably because you responded an hour after the question was posted,
and in the dead of night.  Newsgroups often move slower than that.  But
now we have posted a solution like that, so all's well in the world.  :)

Cheers,
Cliff


On Wed, 2009-02-25 at 08:20 +0000, hrishy wrote:
> Hi Lie
> 
> I am not a python guy but very interested in the langauge and i consider the people on this list to be intelligent and was wundering why you people did not suggest xpath for this kind of a problem just curious and willing to learn.
> 
> I am searching for a answer but the question is 
> why not use xpath to extract xml text from a xml doc ?
> 
> regards
> Hrishy
> 
> 
> --- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:
> 
> > From: Lie Ryan <lie.1296 at gmail.com>
> > Subject: Re: XML Parsing
> > To: python-list at python.org
> > Date: Wednesday, 25 February, 2009, 7:33 AM
> > Are you searching for answer or searching for another people
> > that have 
> > the same answer as you? :)
> > 
> > "Many roads lead to Rome" is a very famous
> > quotation...
> > 
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> 
> 
>       
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From meesters at gmx.de  Wed Feb 25 07:40:23 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 12:40:23 GMT
Subject: glibc detected *** python: corrupted double-linked list
Message-ID: <49a53c36$0$713$9b622d9e@news.freenet.de>

Hoi,

I have a problem using my software on my 64bit laptop, after an update of
my system. The same code still runs on 32bit Intel, but on my laptop I
provoke the crash in the title. The crash is caused - as narrowed down by
me - by returning a static PyObject from a C-extension function.

Well, now I wondering what to do? A web search delivered no relevant bug
reports about glibc on my system (the recent Ubuntu 8.10). Is there a
source for validated glibc for x86_64? Oh, and I'm using Ubuntu's ready-
made Python package, version 2.5.2..

Anyone experiences with such problems? Any ideas? Information missing?

TIA
Christian

PS The extension module itself can be found here: http://
svn.origo.ethz.ch/viewvc/sas-rigid/src/calc.c?revision=209&view=markup
But, as I said, the code is perhaps far from being perfect, but it runs on
32bit computers. The crash occurs at line 164 - "return py_pofr;".



From zelegolas at gmail.com  Wed Feb 25 07:51:21 2009
From: zelegolas at gmail.com (zelegolas)
Date: Wed, 25 Feb 2009 04:51:21 -0800 (PST)
Subject: Python Imaging Library (PIL): create PDF from scratch
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
	<MPqdnRO40I7QaT_UnZ2dnUVZ_sjinZ2d@pdx.net>
Message-ID: <d8508669-d6e9-4b8c-8f10-c0cab8e3388c@s19g2000vbp.googlegroups.com>

Like David said now i used PIL for individual images and reportlab to
generate a pdf.

Thanks for your advices :)



From alia_khouri at yahoo.com  Wed Feb 25 07:56:03 2009
From: alia_khouri at yahoo.com (Alia Khouri)
Date: Wed, 25 Feb 2009 04:56:03 -0800 (PST)
Subject: sorting tasks by importance and urgency
Message-ID: <48f61eb3-ab38-4a18-947a-02d091d96aeb@j8g2000yql.googlegroups.com>

I recently considered the apparently simple problem is of how to
algorithmically sort a set of business tasks which have an associated
a value and a due_date, such that the most important and urgent are
pushed to the top of the stack.

The two example task types I am posing here are: (1) a bid on a
contract and (2) leaverequest from an employee.

To sort by importance: I just consider the proportional value of each
task in relation to the total value of tasks.

To sort by urgency: I used something along the lines of excel's
percentrank function (http://office.microsoft.com/en-us/excel/
HP052092121033.aspx) to rank the tasks in percentage terms of the set
of days_to delivery.

The code is pretty self-explanatory, and I think the algorithm seems
to work ok so far, but in case I have missed something or there exists
some better way of doing this...

<priority.py>
from datetime import date

weights = {
    'Tender'      : 1.0,
    'LeaveRequest': 0.1
}

rnd = lambda x: round(x,2)

class Task(object):
    """a simple prioritizing Task class"""

    def __init__(self, kind, value, due_date=None):
        self.kind = kind
        self.value = value
        self.due_date = due_date if due_date else date.today()
        self.weight = weights[kind]
        self.urgency = 0.0
        self.importance = 0.0

    def __repr__(self):
        return '<Task: %5s - %4s - %5s - %12s - %3s - %s>' % (
            rnd(self.priority), rnd(self.importance), rnd
(self.urgency),
            self.kind, self.days_to, self.value)

    def __cmp__(self, other):
        return cmp(self.priority, other.priority)

    @property
    def days_to(self):
        return (self.due_date - date.today()).days

    @property
    def priority(self):
        return self.weight * (self.importance + self.urgency)

    def relative_urgency(self, N, due_days):
        rank = due_days.index(self.days_to)
        return float(rank) / (N - 1)

    def relative_importance(self, total_value):
        return self.value / total_value

    @staticmethod
    def prioritize(tasks):
        print ("<Task: priority - importance - urgency - "
               "kind - days_to - value>\n")
        N = len(tasks)
        total_value = sum(t.value for t in tasks)
        due_days = sorted([t.days_to for t in tasks], reverse=True)
        for i in tasks:
            i.importance = i.relative_importance(total_value)
            i.urgency = i.relative_urgency(N, due_days)

        for i in sorted(tasks, reverse=True):
            print i

tasks = [
    # name               value       due_date
    Task("Tender",       1000000.0,  date(2009,4,1)),
    Task("Tender",       500400.0,   date(2009,5,1)),
    Task("Tender",       1000000.0,  date(2009,6,1)),
    Task("LeaveRequest", 0.0,        date(2009,7,1)),
    Task("LeaveRequest", 0.0,        date(2009,8,1)),
]


if __name__ == '__main__':
    Task.prioritize(tasks)

</priority.py>

regards,

AK


From steve at holdenweb.com  Wed Feb 25 07:58:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 07:58:09 -0500
Subject: Free Python Training
Message-ID: <go3f98$3vn$1@ger.gmane.org>

Not a joke, but a genuine offer extended to anyone who has already
contributed to some open source project. See my blog for full details,
and please pass this on to non-Python programmers who are interested in
learning the language.

  http://holdenweb.blogspot.com/2009/02/free-python-training.html

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cournape at gmail.com  Wed Feb 25 08:06:37 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 25 Feb 2009 22:06:37 +0900
Subject: glibc detected *** python: corrupted double-linked list
In-Reply-To: <49a53c36$0$713$9b622d9e@news.freenet.de>
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
Message-ID: <5b8d13220902250506u59452297ra9e4de0c9d907bb3@mail.gmail.com>

On Wed, Feb 25, 2009 at 9:40 PM, Christian Meesters <meesters at gmx.de> wrote:
> Hoi,
>
> I have a problem using my software on my 64bit laptop, after an update of
> my system. The same code still runs on 32bit Intel, but on my laptop I
> provoke the crash in the title. The crash is caused - as narrowed down by
> me - by returning a static PyObject from a C-extension function.

Those errors are caused by writing in an invalid pointer, but not far
enough to cause a direct segfault - just enough to corrupt core data
structures of the runtime :)

>
> Well, now I wondering what to do? A web search delivered no relevant bug
> reports about glibc on my system (the recent Ubuntu 8.10). Is there a
> source for validated glibc for x86_64? Oh, and I'm using Ubuntu's ready-
> made Python package, version 2.5.2..

It is very unlikely the problem is in glibc - I would check your code
carefully first :) On Linux, the following are useful:
 - first, try to compile with as many warning flags as possible (-W
-Wall -Wextra is a pretty good baseline)
 - then, if you have a small reproducible crash, run the extension
under valgrind after having built the extension with -g. This will
give you more informations.
 - if the above does not help, using gdb can help too.

If the program works in 32 but not in 64, there are several things to
look at (long is 8 bytes, not 4 on Linux, so some long -> int
convertion may be broken). Sometimes, the program just happens to work
on 32 bits, but by accident (running valgrind on both 32 and 64 bits
may be helpful too).

cheers,

David


From rdmurray at bitdance.com  Wed Feb 25 08:39:58 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 13:39:58 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
Message-ID: <go3hnd$dj0$1@ger.gmane.org>

John Machin <sjmachin at lexicon.net> wrote:
> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
> wrote:
> > Dear python-list,
> >
> > I'm having some trouble decoding an email header using the standard
> > imaplib.IMAP4 class and email.message_from_string method.
> >
> > In particular, email.message_from_string() does not seem to properly
> > decode unicode characters in the subject.
> >
> > How do I decode unicode characters in the subject?
> 
> You don't. You can't. You decode str objects into unicode objects. You
> encode unicode objects into str objects. If your input is not a str
> object, you have a problem.

I can't speak for the OP, but I had a similar (and possibly
identical-in-intent) question.  Suppose you have a Subject line that
looks like this:

    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

How do you get the email module to decode that into unicode?  The same
question applies to the other header lines, and the answer is it isn't
easy, and I had to read and reread the docs and experiment for a while
to figure it out.  I understand there's going to be a sprint on the
email module at pycon, maybe some of this will get improved then.

Here's the final version of my test program.  The third to last line is
one I thought ought to work given that Header has a __unicode__ method.
The final line is the one that did work (note the kludge to turn None
into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
and this code shows why!)

-------------------------------------------------------------------
from email import message_from_string
from email.header import Header, decode_header

x = message_from_string("""\
To: test
Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

this is a test.
""")

print x
print "--------------------"
for key, header in x.items():
    print key, 'type', type(header)
    print key+":", unicode(Header(header)).decode('utf-8')
    print key+":", decode_header(header)
    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
-------------------------------------------------------------------


    From nobody Wed Feb 25 08:35:29 2009
    To: test
    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

    this is a test.

    --------------------
    To type <type 'str'>
    To: test
    To: [('test', None)]
    To: test
    Subject type <type 'str'>
    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
    Subject: 'u' Obselete type-- it is identical to 'd'. (7)


--RDM



From lists at cheimes.de  Wed Feb 25 08:47:03 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 14:47:03 +0100
Subject: Convert PySerial to python 3.0
In-Reply-To: <f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
Message-ID: <go3i4n$f72$1@ger.gmane.org>

Seth wrote:
> I implemented "if isinstance(port, str): " that seems to work for now.
> 
> Currently I am running into:
> 
> err, n = win32file.WriteFile(self.hComPort, data,
> self._overlappedWrite)
> TypeError: expected an object with a buffer interface

Unicode objects (in Py3k: str) don't implement the buffer interface. You
have to apply a bytes or bytearray instance.

Christian



From ra.ravi.rav at gmail.com  Wed Feb 25 08:58:13 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Wed, 25 Feb 2009 05:58:13 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.476.1235338206.11746.python-list@python.org>
Message-ID: <c0e8b232-e6aa-4386-a4be-d8a982d473f1@f24g2000vbf.googlegroups.com>

Thnak you all.

> In the future, explain "didn't work".
> Wrong output? give actual (copy and paste) and expected.
> Error message? give traceback (copy and paste).

I will be careful.


From ptmcg at austin.rr.com  Wed Feb 25 09:04:23 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 25 Feb 2009 06:04:23 -0800 (PST)
Subject: XML Parsing
References: <mailman.715.1235546254.11746.python-list@python.org>
Message-ID: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>

On Feb 25, 1:17?am, hrishy <hris... at yahoo.co.uk> wrote:
> Hi
>
> Something like this
>
<snip solution using ElementTree>
>
> Note i am not a python programmer just a enthusiast and i was curious why people on the list didnt suggest a code like above
>

You just beat the rest of us to it - good example of ElementTree for
parsing XML (and I Iearned the '//' shortcut for one or more
intervening tag levels).

To the OP: if you are parsing XML, I would look hard at the modules
(esp. ElementTree) that are written explicitly for XML, before
considering using regular expressions.  There are just too many
potential surprises when trying to match XML tags - presence/absence/
order of attributes, namespaces, whitespace inside tags, to name a
few.

-- Paul


From starsareblueandfaraway at gmail.com  Wed Feb 25 09:09:49 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Wed, 25 Feb 2009 09:09:49 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
In-Reply-To: <go3hnd$dj0$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
Message-ID: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>

Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
code you suggested, RDM.  It looks quite helpful and I'll report the
results.

In the meantime, John asked for more data.  The sender's email client
is Microsoft Outlook 11.  The recipient email client is Lotus Notes.



Actual Subject
=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=

Expected Subject
Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records

X-Mailer
Microsoft Office Outlook 11

X-MimeOLE
Produced By Microsoft MimeOLE V6.00.2900.5579



RHH



On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
> John Machin <sjmachin at lexicon.net> wrote:
>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>> wrote:
>> > Dear python-list,
>> >
>> > I'm having some trouble decoding an email header using the standard
>> > imaplib.IMAP4 class and email.message_from_string method.
>> >
>> > In particular, email.message_from_string() does not seem to properly
>> > decode unicode characters in the subject.
>> >
>> > How do I decode unicode characters in the subject?
>>
>> You don't. You can't. You decode str objects into unicode objects. You
>> encode unicode objects into str objects. If your input is not a str
>> object, you have a problem.
>
> I can't speak for the OP, but I had a similar (and possibly
> identical-in-intent) question. ?Suppose you have a Subject line that
> looks like this:
>
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> How do you get the email module to decode that into unicode? ?The same
> question applies to the other header lines, and the answer is it isn't
> easy, and I had to read and reread the docs and experiment for a while
> to figure it out. ?I understand there's going to be a sprint on the
> email module at pycon, maybe some of this will get improved then.
>
> Here's the final version of my test program. ?The third to last line is
> one I thought ought to work given that Header has a __unicode__ method.
> The final line is the one that did work (note the kludge to turn None
> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
> and this code shows why!)
>
> -------------------------------------------------------------------
> from email import message_from_string
> from email.header import Header, decode_header
>
> x = message_from_string("""\
> To: test
> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> this is a test.
> """)
>
> print x
> print "--------------------"
> for key, header in x.items():
> ? ?print key, 'type', type(header)
> ? ?print key+":", unicode(Header(header)).decode('utf-8')
> ? ?print key+":", decode_header(header)
> ? ?print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
> -------------------------------------------------------------------
>
>
> ? ?From nobody Wed Feb 25 08:35:29 2009
> ? ?To: test
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
> ? ? ? ? ? ?=?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> ? ?this is a test.
>
> ? ?--------------------
> ? ?To type <type 'str'>
> ? ?To: test
> ? ?To: [('test', None)]
> ? ?To: test
> ? ?Subject type <type 'str'>
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
> ? ?Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
> ? ?Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>
>
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Wed Feb 25 09:20:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 09:20:21 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
Message-ID: <49A553A5.4050309@holdenweb.com>

Roy H. Han wrote:
> On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
[Top-posting corrected]
>> John Machin <sjmachin at lexicon.net> wrote:
>>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>>> wrote:
>>>> Dear python-list,
>>>>
>>>> I'm having some trouble decoding an email header using the standard
>>>> imaplib.IMAP4 class and email.message_from_string method.
>>>>
>>>> In particular, email.message_from_string() does not seem to properly
>>>> decode unicode characters in the subject.
>>>>
>>>> How do I decode unicode characters in the subject?
>>> You don't. You can't. You decode str objects into unicode objects. You
>>> encode unicode objects into str objects. If your input is not a str
>>> object, you have a problem.
>> I can't speak for the OP, but I had a similar (and possibly
>> identical-in-intent) question.  Suppose you have a Subject line that
>> looks like this:
>>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> How do you get the email module to decode that into unicode?  The same
>> question applies to the other header lines, and the answer is it isn't
>> easy, and I had to read and reread the docs and experiment for a while
>> to figure it out.  I understand there's going to be a sprint on the
>> email module at pycon, maybe some of this will get improved then.
>>
>> Here's the final version of my test program.  The third to last line is
>> one I thought ought to work given that Header has a __unicode__ method.
>> The final line is the one that did work (note the kludge to turn None
>> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
>> and this code shows why!)
>>
>> -------------------------------------------------------------------
>> from email import message_from_string
>> from email.header import Header, decode_header
>>
>> x = message_from_string("""\
>> To: test
>> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> this is a test.
>> """)
>>
>> print x
>> print "--------------------"
>> for key, header in x.items():
>>    print key, 'type', type(header)
>>    print key+":", unicode(Header(header)).decode('utf-8')
>>    print key+":", decode_header(header)
>>    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
>> -------------------------------------------------------------------
>>
>>
>>    From nobody Wed Feb 25 08:35:29 2009
>>    To: test
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
>>            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>>    this is a test.
>>
>>    --------------------
>>    To type <type 'str'>
>>    To: test
>>    To: [('test', None)]
>>    To: test
>>    Subject type <type 'str'>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
>>    Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>>
>>
> Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
> code you suggested, RDM.  It looks quite helpful and I'll report the
> results.
> 
> In the meantime, John asked for more data.  The sender's email client
> is Microsoft Outlook 11.  The recipient email client is Lotus Notes.
> 
> 
> 
> Actual Subject
> =?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=
> 
> Expected Subject
> Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records
> 
> X-Mailer
> Microsoft Office Outlook 11
> 
> X-MimeOLE
> Produced By Microsoft MimeOLE V6.00.2900.5579
> 
>>> from email.header import decode_header
>>> print
decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
[('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
Records', 'us-ascii')]
>>>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb 25 09:20:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 09:20:21 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
Message-ID: <49A553A5.4050309@holdenweb.com>

Roy H. Han wrote:
> On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
[Top-posting corrected]
>> John Machin <sjmachin at lexicon.net> wrote:
>>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>>> wrote:
>>>> Dear python-list,
>>>>
>>>> I'm having some trouble decoding an email header using the standard
>>>> imaplib.IMAP4 class and email.message_from_string method.
>>>>
>>>> In particular, email.message_from_string() does not seem to properly
>>>> decode unicode characters in the subject.
>>>>
>>>> How do I decode unicode characters in the subject?
>>> You don't. You can't. You decode str objects into unicode objects. You
>>> encode unicode objects into str objects. If your input is not a str
>>> object, you have a problem.
>> I can't speak for the OP, but I had a similar (and possibly
>> identical-in-intent) question.  Suppose you have a Subject line that
>> looks like this:
>>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> How do you get the email module to decode that into unicode?  The same
>> question applies to the other header lines, and the answer is it isn't
>> easy, and I had to read and reread the docs and experiment for a while
>> to figure it out.  I understand there's going to be a sprint on the
>> email module at pycon, maybe some of this will get improved then.
>>
>> Here's the final version of my test program.  The third to last line is
>> one I thought ought to work given that Header has a __unicode__ method.
>> The final line is the one that did work (note the kludge to turn None
>> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
>> and this code shows why!)
>>
>> -------------------------------------------------------------------
>> from email import message_from_string
>> from email.header import Header, decode_header
>>
>> x = message_from_string("""\
>> To: test
>> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> this is a test.
>> """)
>>
>> print x
>> print "--------------------"
>> for key, header in x.items():
>>    print key, 'type', type(header)
>>    print key+":", unicode(Header(header)).decode('utf-8')
>>    print key+":", decode_header(header)
>>    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
>> -------------------------------------------------------------------
>>
>>
>>    From nobody Wed Feb 25 08:35:29 2009
>>    To: test
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
>>            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>>    this is a test.
>>
>>    --------------------
>>    To type <type 'str'>
>>    To: test
>>    To: [('test', None)]
>>    To: test
>>    Subject type <type 'str'>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
>>    Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>>
>>
> Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
> code you suggested, RDM.  It looks quite helpful and I'll report the
> results.
> 
> In the meantime, John asked for more data.  The sender's email client
> is Microsoft Outlook 11.  The recipient email client is Lotus Notes.
> 
> 
> 
> Actual Subject
> =?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=
> 
> Expected Subject
> Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records
> 
> X-Mailer
> Microsoft Office Outlook 11
> 
> X-MimeOLE
> Produced By Microsoft MimeOLE V6.00.2900.5579
> 
>>> from email.header import decode_header
>>> print
decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
[('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
Records', 'us-ascii')]
>>>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From aahz at pythoncraft.com  Wed Feb 25 09:21:54 2009
From: aahz at pythoncraft.com (Aahz)
Date: 25 Feb 2009 06:21:54 -0800
Subject: Free Python Training: Washington, DC (3/3-5)
References: <mailman.729.1235566709.11746.python-list@python.org>
Message-ID: <go3k62$lvs$1@panix3.panix.com>

In article <mailman.729.1235566709.11746.python-list at python.org>,
Steve Holden  <steve at holdenweb.com> wrote:
>
>Not a joke, but a genuine offer extended to anyone who has already
>contributed to some open source project. See my blog for full details,
>and please pass this on to non-Python programmers who are interested in
>learning the language.
>
>  http://holdenweb.blogspot.com/2009/02/free-python-training.html

Fixed the Subject: line for you.  ;-)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From stefan_ml at behnel.de  Wed Feb 25 09:39:15 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 25 Feb 2009 15:39:15 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <49a1b17d$0$28748$9b622d9e@news.freenet.de>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<49a1b17d$0$28748$9b622d9e@news.freenet.de>
Message-ID: <49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>

Martin v. L?wis wrote:
> intelliminer at gmail.com wrote:
>> Is there a limit to the size or number of entries that a single 
>> dictionary can possess?
> 
> On a 32-bit system, the dictionary can have up to 2**31 slots,
> meaning that the maximum number of keys is slightly smaller
> (about 2**30).

Which, in practice, means that the size is limited by the available memory.

Stefan


From marduk at letterboxes.org  Wed Feb 25 09:42:32 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 25 Feb 2009 09:42:32 -0500
Subject: Lambda function
In-Reply-To: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
References: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
Message-ID: <1235572952.11727.2.camel@localhost.localdomain>

On Wed, 2009-02-25 at 17:56 +0530, aditya saurabh wrote:
> I defined two functions - lets say
> fa = lambda x: 2*x
> fb = lambda x: 3*x
> Now I would like to use fa*fb in terms of x
> is there a way?
> Thanks in advance

I'm not sure what "use fa*fb in terms of x" means.

But if you mean fa(x) * fb(x) then it's just:

    fa(x) * fb(x)

-a



From bnsilinux at gmail.com  Wed Feb 25 09:43:35 2009
From: bnsilinux at gmail.com (Ben)
Date: Wed, 25 Feb 2009 06:43:35 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
Message-ID: <33411bf0-396a-4aef-83ad-4d4e68b26050@l22g2000vba.googlegroups.com>

On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?No, It uses the the S-lang for video, and input control. However, SLAG
> > ?is more of an abstract layer on top of that.
>
> > ?It has a Structures that contains menus and screens (menumodule /
> > ?screenmodule). One LOADS them up with parameters. ?such as creating
> > ?a new menu is like:
>
> > ?OpenMenu( Company name, SubSystem, this program name, mode, bottom
> > ?status display) - Create initial menu structure Addtomenu(Menu
> > ?Block Set name, DISPLAY line, ID, type of program, password ID ) -
> > ?add to / update MENU blocks. ?runMenu() - Displays the whole create
> > ?menu structure.
>
> > ?The Menu structure is done in pull downs and scrollable blocks in a
> > ?TUI (text User Interface) and using the S-lang screen library is
> > ?fully mouseable.
>
> > ?The screen module works mych the same way, but with the abiltity to
> > ?open and close and work within "Sub Screens".
>
> > ?For those who do not know, S-lang is a interpreted language much
> > ?like Python. However, there is s direth of library modules. The
> > ?original S-lang started out as library of screen of keyboard
> > ?modules, but has been expanded
>
> > ?My SLAG project does not care in reality WHICH or what language, it
> > ?is simply handling menu and screen control.
>
> So do you want to embed python into your code?
>
> I'm still not clear what you are trying to achieve with python, though
> I have a better idea what SLAG is now!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Actually no, I want to EXTEND python using the lower levels of S-lang
screen modules.

My Modules are written in C and are a frame work for building pull-
down menus and data entry screens.

Very nice for writing business applications. Think along the lines of
FoxPro and/or the
"Screen" section in Cobol and you have a pretty good idea of what i
have done.


From rdmurray at bitdance.com  Wed Feb 25 09:50:37 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 14:50:37 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com>
Message-ID: <go3lrt$und$1@ger.gmane.org>

Steve Holden <steve at holdenweb.com> wrote:
> >>> from email.header import decode_header
> >>> print
> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
> Records', 'us-ascii')]
> >>>

It is interesting that decode_header does what I would consider to be
the right thing (from a pragmatic standpoint) with that particular bit
of Microsoft not-quite-standards-compliant brain-damage; but, removing
the tab is not in fact standards compliant if I'm reading the RFC
correctly.

--RDM



From king.seth at gmail.com  Wed Feb 25 10:07:51 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 07:07:51 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
Message-ID: <ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>

I tried all three ways you guys listed nothing seems to convert the
string to bytes.

It may have to do with the makeDeviceName function, but I can't find
where that is defined.

Any thoughts??

Here is the whole block of code:

if type(port) in (str, bytes):       #strings are taken directly
Originally:     if type(port) in [type(''), type(u'')]
                self.portstr = port
            else:
                self.portstr = self.makeDeviceName(port)



On Feb 25, 8:47?am, Christian Heimes <li... at cheimes.de> wrote:
> Seth wrote:
> > I implemented "if isinstance(port, str): " that seems to work for now.
>
> > Currently I am running into:
>
> > err, n = win32file.WriteFile(self.hComPort, data,
> > self._overlappedWrite)
> > TypeError: expected an object with a buffer interface
>
> Unicode objects (in Py3k: str) don't implement the buffer interface. You
> have to apply a bytes or bytearray instance.
>
> Christian



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:10:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:10:30 -0200
Subject: Lambda function
References: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
	<1235572952.11727.2.camel@localhost.localdomain>
Message-ID: <op.upwxrsagx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 12:42:32 -0200, Albert Hopkins  
<marduk at letterboxes.org> escribi?:
> On Wed, 2009-02-25 at 17:56 +0530, aditya saurabh wrote:

>> I defined two functions - lets say
>> fa = lambda x: 2*x
>> fb = lambda x: 3*x
>> Now I would like to use fa*fb in terms of x
>> is there a way?
>> Thanks in advance
>
> I'm not sure what "use fa*fb in terms of x" means.
>
> But if you mean fa(x) * fb(x) then it's just:
>
>     fa(x) * fb(x)

I think he wants function composition, fb(fa(x)):

def compose(*funcs):
   def composed(x, funcs=funcs):
     for f in reversed(funcs):
       x = f(x)
     return x
   return composed

def square(x): return x**2
def plus1(x): return x+1
# same as plus1 = lambda x: x+1 but I like the def syntax

y = compose(square, plus1) # y=(x+1)**2
y(3) # -> 16

(or is it fa(fb(x))?)

-- 
Gabriel Genellina



From lists at cheimes.de  Wed Feb 25 10:16:11 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 16:16:11 +0100
Subject: Convert PySerial to python 3.0
In-Reply-To: <ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>	<mailman.704.1235534148.11746.python-list@python.org>	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
Message-ID: <go3nbr$53q$1@ger.gmane.org>

Seth wrote:
> I tried all three ways you guys listed nothing seems to convert the
> string to bytes.
> 
> It may have to do with the makeDeviceName function, but I can't find
> where that is defined.
> 
> Any thoughts??
> 
> Here is the whole block of code:
> 
> if type(port) in (str, bytes):       #strings are taken directly
> Originally:     if type(port) in [type(''), type(u'')]
>                 self.portstr = port
>             else:
>                 self.portstr = self.makeDeviceName(port)

str and bytes are two totally unrelated things in Python 3.0. You can no
longer treat them equally like str and unicode in Python 2.x. Your could
should not work under Python 3.0 anyway. u'' is invalid in 3.x.

Also please don't use ugly type checks like type(something) == type('').
Starting with Python 2.2 you should use isinstance, for example
isinstance(number, (int, long)).

Christian



From starsareblueandfaraway at gmail.com  Wed Feb 25 10:17:22 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Wed, 25 Feb 2009 10:17:22 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
In-Reply-To: <go3lrt$und$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
Message-ID: <6a5569ec0902250717q7832bce3ocb6ae279184b32a0@mail.gmail.com>

Cool, it works!

Thanks, RDM, for stating the right approach.
Thanks, Steve, for teaching by example.

I wonder why the email.message_from_string() method doesn't call
email.header.decode_header() automatically.


On Wed, Feb 25, 2009 at 9:50 AM,  <rdmurray at bitdance.com> wrote:
> Steve Holden <steve at holdenweb.com> wrote:
>> >>> from email.header import decode_header
>> >>> print
>> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
>> [('Inteum C/SR User Tip: ?Quick Access to Recently Opened Inteum C/SR
>> Records', 'us-ascii')]
>> >>>
>
> It is interesting that decode_header does what I would consider to be
> the right thing (from a pragmatic standpoint) with that particular bit
> of Microsoft not-quite-standards-compliant brain-damage; but, removing
> the tab is not in fact standards compliant if I'm reading the RFC
> correctly.
>
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Wed Feb 25 10:24:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 10:24:17 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <go3lrt$und$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>
Message-ID: <go3nra$71j$1@ger.gmane.org>

rdmurray at bitdance.com wrote:
> Steve Holden <steve at holdenweb.com> wrote:
>>>>> from email.header import decode_header
>>>>> print
>> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
>> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
>> Records', 'us-ascii')]
> 
> It is interesting that decode_header does what I would consider to be
> the right thing (from a pragmatic standpoint) with that particular bit
> of Microsoft not-quite-standards-compliant brain-damage; but, removing
> the tab is not in fact standards compliant if I'm reading the RFC
> correctly.
> 
You'd need to quote me chapter and verse on that. I understood that the
tab simply indicated continuation, but it's a *long* time since I read
the RFCs.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From music24by7 at gmail.com  Wed Feb 25 10:26:30 2009
From: music24by7 at gmail.com (Sudhir Kakumanu)
Date: Wed, 25 Feb 2009 20:56:30 +0530
Subject: File Path retrieving problem
Message-ID: <52c4d4ea0902250726u44e4ddap95fa68cd37a8f8f3@mail.gmail.com>

Hi all,

I am new to Python, i have installed python 2.5.4 and it is my requirement.

I need to retrieve the path of filename in python.

I have found some API's to get this:

from os.path import realpath
print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the path of
the file as C:\Python25\WorkSpace\NEWS.txt
print realpath("abc.txt") # here abc.txt does not exist but still it shows
C:\Python25\WorkSpace\abc.txt

can anybody tell the reason why????


Now took some safety measures:

found = lexists(realpath(filename))
        if found == 0:
            print "Not Found"
        else:
            print realpath(filename)

i have given the filename as "NEWS.txt" and "abc.txt" but i am always
getting the output as "Not Found"


Can anyone please tell me where am i doing wrong????

also any suggestions to retrieve the filepath from a given filename is
highly appreciated.

Thanks in advance.


Regards,
Sudhir
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From pythonsky at sky.com  Wed Feb 25 10:31:25 2009
From: pythonsky at sky.com (Gary Wood)
Date: Wed, 25 Feb 2009 15:31:25 -0000
Subject: Newbie : this works in one direction but get the error on the return
	path 
Message-ID: <F1ABEEBBCB124871975C6A14B9572794@Woodygar>

'''Test animation of a group of objects making a face.
Combine the face elements in a function, and use it twice.
Have an extra level of repetition in the animation.
'''

from graphics import *
import time

def moveAll(shapeList, dx, dy):
    ''' Move all shapes in shapeList by (dx, dy).'''    
    for shape in shapeList: 
        shape.move(dx, dy)
            

def moveAllOnLine(shapeList, dx, dy, repetitions, delay):
    '''Animate the shapes in shapeList along a line.
    Move by (dx, dy) each time.
    Repeat the specified number of repetitions.
    Have the specified delay (in seconds) after each repeat.
    '''
    for i in range(repetitions):
        moveAll(shapeList, dx, dy)
        time.sleep(delay)
        

def makeFace(center, win):
    '''display face centered at center in window win.
    Return a list of the shapes in the face.
    '''
    
    head = Circle(center, 25)
    head.setFill("yellow")
    head.draw(win)

    eye1Center = center.clone()  #face positions are relative to the center
    eye1Center.move(-10, 5)      #locate further points in relation to others
    eye1 = Circle(eye1Center, 5)
    eye1.setFill('blue')
    eye1.draw(win)

    eye2End1 = eye1Center.clone()
    eye2End1.move(15, 0)
    eye2End2 = eye2End1.clone()
    eye2End2.move(10, 0)
    
    eye2 = Line(eye2End1, eye2End2)
    eye2.setWidth(3)
    eye2.draw(win)

    noseTop = center.clone()
    noseTop.move(0,0)
    noseLeft = noseTop.clone()
    noseLeft.move(-2,-2)
    noseRight = noseLeft.clone()
    noseRight.move(5,0)
    nose = Polygon(noseTop,noseLeft,noseRight)
    nose.draw(win)


    mouthCorner1 = center.clone()
    mouthCorner1.move(-10, -10)
    mouthCorner2 = mouthCorner1.clone()
    mouthCorner2.move(20, -5)
    
    mouth = Oval(mouthCorner1, mouthCorner2)
    mouth.setFill("red")
    mouth.draw(win)

    return [head, eye1, eye2,nose, mouth]

def main():
    winWidth = 300
    winHeight = 300
    win = GraphWin('Back and Forth', winWidth, winHeight)
    win.setCoords(0, 0, winWidth, winHeight)  #make right side up coordinates!

    rect = Rectangle(Point(200, 90), Point(220, 100))
    rect.setFill("blue")
    rect.draw(win)

    faceList = makeFace(Point(40, 100), win)
    faceList2 = makeFace(Point(150,125), win)

    stepsAcross = 40
    dx = 5
    dy = 3
    wait = .1
    for i in range(2):
        moveAllOnLine(faceList, dx, 0, stepsAcross, wait)
        moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
        moveAllOnLine(faceList, -dx, -dy, stepsAcross//2, wait) 

    Text(Point(winWidth/2, 20), 'Click anywhere to quit.').draw(win)
    win.getMouse()
    win.close()

main()


Traceback (most recent call last):
  File "E:/python/handson/backAndForth4.py", line 97, in <module>
    main()
  File "E:/python/handson/backAndForth4.py", line 90, in main
    moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
  File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
    for i in range(repetitions):
TypeError: 'float' object cannot be interpreted as an integer
>>> 
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From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:33:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:33:13 -0200
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
Message-ID: <op.upwytna6x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 10:40:23 -0200, Christian Meesters <meesters at gmx.de>  
escribi?:

> I have a problem using my software on my 64bit laptop, after an update of
> my system. The same code still runs on 32bit Intel, but on my laptop I
> provoke the crash in the title. The crash is caused - as narrowed down by
> me - by returning a static PyObject from a C-extension function.

I think you got all the reference counts wrong, specially dummy1, dummy2  
and r.

(BTW, when you know the size, it's better to use PyList_New(size) +  
PyList_SET_ITEM instead of PyList_New(0) + PyList_Append)

-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 10:36:59 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 15:36:59 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.730.1235567202.11746.python-list@python.org>
Message-ID: <49a5659b$0$656$9b622d9e@news.freenet.de>

Thanks David!

It's still not debugged, but indeed: I get a bunch of warnings. And this 
already showed me that there are more potential problems than my first 
guess indicated. Alas, for my specific problem I cannot work with ints 
chars and doubles. I need to have unsigned longs at some points.

Well, I'll sort it out.

Cheers
Christian


From music24by7 at gmail.com  Wed Feb 25 10:37:21 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 07:37:21 -0800 (PST)
Subject: File Path retrieving problem
Message-ID: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>

Hi all,

I am new to Python, i have installed python 2.5.4 and it is my
requirement.

I need to retrieve the path of filename in python.

I have found some API's to get this:

from os.path import realpath
print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
path of the file as C:\Python25\WorkSpace\NEWS.txt
print realpath("abc.txt") # here abc.txt does not exist but still it
shows C:\Python25\WorkSpace\abc.txt

can anybody tell the reason why????


Now took some safety measures:

found = lexists(realpath(filename))
        if found == 0:
            print "Not Found"
        else:
            print realpath(filename)

i have given the filename as "NEWS.txt" and "abc.txt" but i am always
getting the output as "Not Found"


Can anyone please tell me where am i doing wrong????

also any suggestions to retrieve the filepath from a given filename is
highly appreciated.

Thanks in advance.


Regards,
Sudhir


From thorsten at thorstenkampe.de  Wed Feb 25 10:40:31 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 16:40:31 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
Message-ID: <MPG.240f84deef77395e9897cc@news.individual.de>

* Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
> Thanks, RDM, for stating the right approach.
> Thanks, Steve, for teaching by example.
> 
> I wonder why the email.message_from_string() method doesn't call
> email.header.decode_header() automatically.

And I wonder why you would think the header contains Unicode characters 
when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency 
to label everything "Unicode" someone does not understand.

Thorsten


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:51:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:51:18 -0200
Subject: Newbie : this works in one direction but get the error on the
	return path
References: <F1ABEEBBCB124871975C6A14B9572794@Woodygar>
Message-ID: <op.upwznsvux6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:31:25 -0200, Gary Wood <pythonsky at sky.com> escribi?:

Start looking at the error:

> Traceback (most recent call last):
>   File "E:/python/handson/backAndForth4.py", line 97, in <module>
>     main()
>   File "E:/python/handson/backAndForth4.py", line 90, in main
>     moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
>   File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
>     for i in range(repetitions):
> TypeError: 'float' object cannot be interpreted as an integer

It's rather understandable - you have a float object where Python is  
expecting an integer.
Where? The traceback says it all:

>   File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
>     for i in range(repetitions):

Ok, so repetitions should be an integer, but it isn't. Where does it come  
from? It's an argument to moveAllOnLine, and was called from main (see the  
line above that in the traceback). Now we look near that line:

>     for i in range(2):
>         moveAllOnLine(faceList, dx, 0, stepsAcross, wait)
>         moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
>         moveAllOnLine(faceList, -dx, -dy, stepsAcross//2, wait)

Don't you see something suspicious...?


-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 10:51:20 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 15:51:20 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.744.1235576012.11746.python-list@python.org>
Message-ID: <49a568f8$0$656$9b622d9e@news.freenet.de>

Hi,

>> I have a problem using my software on my 64bit laptop, after an update
>> of my system. The same code still runs on 32bit Intel, but on my laptop
>> I provoke the crash in the title. The crash is caused - as narrowed
>> down by me - by returning a static PyObject from a C-extension
>> function.
> 
> I think you got all the reference counts wrong, specially dummy1, dummy2
> and r.
Might be a good point, but can you give me a hint where to look 
specifically?
> 
> (BTW, when you know the size, it's better to use PyList_New(size) +
> PyList_SET_ITEM instead of PyList_New(0) + PyList_Append)
Just rewrote that section.

Thank you.
Christian


From antisuho at gmail.com  Wed Feb 25 10:52:03 2009
From: antisuho at gmail.com (anti-suho)
Date: Wed, 25 Feb 2009 07:52:03 -0800 (PST)
Subject: How to convert image into numpy.ndarray
Message-ID: <4e80357e-039e-4165-bd73-c23603a0299a@r34g2000vbp.googlegroups.com>

In scipy module, there is a function named misc.lena which can return
an array of numpy.ndarray type. If you use this array as parameter of
matplotlib.pyplot.imshow and then call the matplotlib.pyplot.imshow
function, an image will be shown. The shown image is generated by the
numpy.ndarray array.

How to convert an arbitrary image into an array of numpy.ndarray type?


From steve at holdenweb.com  Wed Feb 25 10:57:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 10:57:41 -0500
Subject: File Path retrieving problem
In-Reply-To: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
Message-ID: <go3ppv$erg$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> Hi all,
> 
> I am new to Python, i have installed python 2.5.4 and it is my
> requirement.
> 
> I need to retrieve the path of filename in python.
> 
> I have found some API's to get this:
> 
> from os.path import realpath
> print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
> path of the file as C:\Python25\WorkSpace\NEWS.txt
> print realpath("abc.txt") # here abc.txt does not exist but still it
> shows C:\Python25\WorkSpace\abc.txt
> 
> can anybody tell the reason why????
> 
> 
> Now took some safety measures:
> 
> found = lexists(realpath(filename))
>         if found == 0:
>             print "Not Found"
>         else:
>             print realpath(filename)
> 
> i have given the filename as "NEWS.txt" and "abc.txt" but i am always
> getting the output as "Not Found"
> 
> 
> Can anyone please tell me where am i doing wrong????
> 
It seems pretty apparent that lexists() nevert returns a true result.

Why not just

if os.path.exists(filename):
    print os.path.realpath(filename)
else:
    print "Not found"

> also any suggestions to retrieve the filepath from a given filename is
> highly appreciated.
> 
Well, realpath returns the path of the file targeted after any symbolic
links have been evaluated, which may or may not be what you want. Have
you looked at os.path.abspath?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:00:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:00:16 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
Message-ID: <op.upwz2qzjx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:

> * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>> Thanks, RDM, for stating the right approach.
>> Thanks, Steve, for teaching by example.
>>
>> I wonder why the email.message_from_string() method doesn't call
>> email.header.decode_header() automatically.
>
> And I wonder why you would think the header contains Unicode characters
> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> to label everything "Unicode" someone does not understand.

And I wonder why you would think the header does *not* contain Unicode  
characters when it says "us-ascii"?. I think there is a tendency here  
too...

-- 
Gabriel Genellina



From king.seth at gmail.com  Wed Feb 25 11:07:30 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 08:07:30 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
	<mailman.739.1235574990.11746.python-list@python.org>
Message-ID: <67d9d270-afad-4c4a-a585-81544ef66670@x13g2000yqf.googlegroups.com>

This is not my code and I am fairly new to Python.  I did not know how
much it would take to convert pyserial to 3.0. Someone more
knowledgeable than me could do it better and faster.  I just want to
see if I could help get it to work.

I was wrong, it seems that if type(port) in (str, bytes): or isinstance
(port, str) works just fine for setting the ports.

The issue now is reading and writing the data.

I got the read() to kind of work with:
bytes(buf[:n]) replacing str(buf[:n])

but with readline() it seems to be missing the '\n' because it just
runs indefinitely( I can see the \n if I read enough bytes with read()


write seems to be related to a win32 issue.  win32file.WriteFile does
not like anything I convert it to:
str gives the buffer error
bytes gives a "string argument without an encoding" error

Sorry for the confusion, I just want to be able to use all Py3k on
this project that I am working on and pyserial has not been converted
so I just started messing around with it.

Thanks for the help.

Seth




On Feb 25, 10:16?am, Christian Heimes <li... at cheimes.de> wrote:
> Seth wrote:
> > I tried all three ways you guys listed nothing seems to convert the
> > string to bytes.
>
> > It may have to do with the makeDeviceName function, but I can't find
> > where that is defined.
>
> > Any thoughts??
>
> > Here is the whole block of code:
>
> > if type(port) in (str, bytes): ? ? ? #strings are taken directly
> > Originally: ? ? if type(port) in [type(''), type(u'')]
> > ? ? ? ? ? ? ? ? self.portstr = port
> > ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? self.portstr = self.makeDeviceName(port)
>
> str and bytes are two totally unrelated things in Python 3.0. You can no
> longer treat them equally like str and unicode in Python 2.x. Your could
> should not work under Python 3.0 anyway. u'' is invalid in 3.x.
>
> Also please don't use ugly type checks like type(something) == type('').
> Starting with Python 2.2 you should use isinstance, for example
> isinstance(number, (int, long)).
>
> Christian



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:16:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:16:47 -0200
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.744.1235576012.11746.python-list@python.org>
	<49a568f8$0$656$9b622d9e@news.freenet.de>
Message-ID: <op.upw0t9hrx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:51:20 -0200, Christian Meesters <meesters at gmx.de>  
escribi?:

>>> I have a problem using my software on my 64bit laptop, after an update
>>> of my system. The same code still runs on 32bit Intel, but on my laptop
>>> I provoke the crash in the title. The crash is caused - as narrowed
>>> down by me - by returning a static PyObject from a C-extension
>>> function.
>>
>> I think you got all the reference counts wrong, specially dummy1, dummy2
>> and r.
> Might be a good point, but can you give me a hint where to look
> specifically?

   /* parse the input arguments r & vectors */
   if (!PyArg_ParseTuple(args, "OO", &r, &py_vectors))
     return NULL;
   ...

   for (i=0; i < vsize; i++) {
     ...
     dummy_2 = PyList_GetItem(dummy_1, 0);
     ...
   }
   ...

   /* copy all items from pofr to py_pofr to be returned */
   if (!(py_pofr = PyList_New(0)))  return NULL;
   for (i=0; i < rlen; i++) {
     dummy_1 = Py_BuildValue("i", pofr[i]);
     if (!dummy_1) return NULL;
     PyList_Append(py_pofr, dummy_1);
     Py_CLEAR(dummy_1);
   }

   /* reference counters to zero */
   Py_CLEAR(dummy_1);
   Py_CLEAR(dummy_2);
   Py_CLEAR(r);


r is an argument, a borrowed reference; you can't Py_CLEAR it.
dummy_1 is decremented inside the loop, and again three lines below.
dummy_2 is used far above the final Py_CLEAR, and it comes from  
PyList_GetItem, which returns a borrowed reference - you can't decrement  
it either.
Also there are several "return NULL" that don't decrement active objects  
(like "if (!dummy_1)..." above)

Getting the reference count right is critical: if you err by +1, the  
object will never be destroyed (leaking memory). If you err by -1, the  
object will be still in use after it was destroyed.

-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 11:17:28 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 16:17:28 GMT
Subject: How to convert image into numpy.ndarray
References: <4e80357e-039e-4165-bd73-c23603a0299a@r34g2000vbp.googlegroups.com>
Message-ID: <49a56f18$0$656$9b622d9e@news.freenet.de>

On Wed, 25 Feb 2009 07:52:03 -0800, anti-suho wrote:

> In scipy module, there is a function named misc.lena which can return an
> array of numpy.ndarray type. If you use this array as parameter of
> matplotlib.pyplot.imshow and then call the matplotlib.pyplot.imshow
> function, an image will be shown. The shown image is generated by the
> numpy.ndarray array.
> 
> How to convert an arbitrary image into an array of numpy.ndarray type?
Well, arbitrary ...

But this may serve as a starting point:

from scipy.misc import fromimage
import Image #PIL
my_array = fromimage(Image.open(_file_name_))

Of course, you should perform the appropriate error checking, too. ;-)

HTH
Christian




From music24by7 at gmail.com  Wed Feb 25 11:17:40 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 08:17:40 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
Message-ID: <9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>

On Feb 25, 8:57?pm, Steve Holden <st... at holdenweb.com> wrote:
> music24... at gmail.com wrote:
> > Hi all,
>
> > I am new to Python, i have installed python 2.5.4 and it is my
> > requirement.
>
> > I need to retrieve the path of filename in python.
>
> > I have found some API's to get this:
>
> > from os.path import realpath
> > print realpath("NEWS.txt") ?# here NEWS.txt exists and it shows the
> > path of the file as C:\Python25\WorkSpace\NEWS.txt
> > print realpath("abc.txt") # here abc.txt does not exist but still it
> > shows C:\Python25\WorkSpace\abc.txt
>
> > can anybody tell the reason why????
>
> > Now took some safety measures:
>
> > found = lexists(realpath(filename))
> > ? ? ? ? if found == 0:
> > ? ? ? ? ? ? print "Not Found"
> > ? ? ? ? else:
> > ? ? ? ? ? ? print realpath(filename)
>
> > i have given the filename as "NEWS.txt" and "abc.txt" but i am always
> > getting the output as "Not Found"
>
> > Can anyone please tell me where am i doing wrong????
>
> It seems pretty apparent that lexists() nevert returns a true result.
>
> Why not just
>
> if os.path.exists(filename):
> ? ? print os.path.realpath(filename)
> else:
> ? ? print "Not found"
>
> > also any suggestions to retrieve the filepath from a given filename is
> > highly appreciated.
>
> Well, realpath returns the path of the file targeted after any symbolic
> links have been evaluated, which may or may not be what you want. Have
> you looked at os.path.abspath?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/



Hi Steve,

I have tried your suggested code and also replaced os.path.realpath
with os.path.abspath but still getting the same result.
I want to know is there any workaround for retrieving the filepaths
given only filename

Regards,
Sudhir


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:23:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:23:32 -0200
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
	<mailman.739.1235574990.11746.python-list@python.org>
	<67d9d270-afad-4c4a-a585-81544ef66670@x13g2000yqf.googlegroups.com>
Message-ID: <op.upw05isxx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 14:07:30 -0200, Seth <king.seth at gmail.com> escribi?:

> This is not my code and I am fairly new to Python.  I did not know how
> much it would take to convert pyserial to 3.0. Someone more
> knowledgeable than me could do it better and faster.  I just want to
> see if I could help get it to work.

The last commit to pyserial repository was 8 days ago, so it's not like an  
abandoned project.
Have you contacted the author?

That said, Python 3.0 is still very recent and doesn't have a big set of  
3rd party libraries as earlier versions. Maybe you should stick to 2.6 or  
even 2.5 for a while.

-- 
Gabriel Genellina



From Shawn at Milochik.com  Wed Feb 25 11:29:25 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 11:29:25 -0500
Subject: "Battleship" style game
Message-ID: <2dc0c81b0902250829x500b8f4ald1e67bb3c5aecf51@mail.gmail.com>

I started learning Java for fun, and the first project assignment in
the book is to create a game like "Battleship." So, of course, I wrote
it in Python first, just for fun. I haven't had the time to look up
all the Java syntax.

So, here it is, fully functional. I thought I'd throw it out there and
see if anyone would like to offer any useful tips. I'm not claiming
it's bulletproof, but it works. I just kind of came up with all the
methods off of the top of my head, so if anyone has any suggestions
for more elegant or efficient code, please let me know.

http://shawnmilo.com/ships/

Thanks,
Shawn


From marco at sferacarta.com  Wed Feb 25 11:38:05 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 25 Feb 2009 17:38:05 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.750.1235579371.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>
Message-ID: <Otepl.44730$8Z.9486@tornado.fastwebnet.it>

Shawn Milochik wrote:

 > I'm not claiming it's bulletproof, but it works. I just kind of came 
up with all the
> methods off of the top of my head, so if anyone has any suggestions
> for more elegant or efficient code, please let me know.

Yes it's in Python alright, but it's not Pythonese yet. You could try 
avoiding the getter/setter stuff, and camelCase method naming, things 
like that, for a start.



From Shawn at Milochik.com  Wed Feb 25 11:50:18 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 11:50:18 -0500
Subject: "Battleship" style game
In-Reply-To: <Otepl.44730$8Z.9486@tornado.fastwebnet.it>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
Message-ID: <2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>

On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com> wrote:
>
> Yes it's in Python alright, but it's not Pythonese yet. You could try
> avoiding the getter/setter stuff, and camelCase method naming, things like
> that, for a start.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


What do you mean avoiding the getter/setter stuff? If I understand
correctly, you're saying to directly access the attributes, which I
specifically want to avoid because I may want to enforce some rules
(such as not changing a ship length after it's created).

The camel-case thing I get -- I use that and this_type quite a bit,
probably because of the inconsistency of the languages I use
regularly, and standards at work and conventions in my hobby
programming.


From steve at holdenweb.com  Wed Feb 25 11:59:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 11:59:32 -0500
Subject: File Path retrieving problem
In-Reply-To: <9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
Message-ID: <go3tdu$sm9$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 25, 8:57 pm, Steve Holden <st... at holdenweb.com> wrote:
>> music24... at gmail.com wrote:
>>> Hi all,
>>> I am new to Python, i have installed python 2.5.4 and it is my
>>> requirement.
>>> I need to retrieve the path of filename in python.
>>> I have found some API's to get this:
>>> from os.path import realpath
>>> print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
>>> path of the file as C:\Python25\WorkSpace\NEWS.txt
>>> print realpath("abc.txt") # here abc.txt does not exist but still it
>>> shows C:\Python25\WorkSpace\abc.txt
>>> can anybody tell the reason why????
>>> Now took some safety measures:
>>> found = lexists(realpath(filename))
>>>         if found == 0:
>>>             print "Not Found"
>>>         else:
>>>             print realpath(filename)
>>> i have given the filename as "NEWS.txt" and "abc.txt" but i am always
>>> getting the output as "Not Found"
>>> Can anyone please tell me where am i doing wrong????
>> It seems pretty apparent that lexists() nevert returns a true result.
>>
>> Why not just
>>
>> if os.path.exists(filename):
>>     print os.path.realpath(filename)
>> else:
>>     print "Not found"
>>
>>> also any suggestions to retrieve the filepath from a given filename is
>>> highly appreciated.
>> Well, realpath returns the path of the file targeted after any symbolic
>> links have been evaluated, which may or may not be what you want. Have
>> you looked at os.path.abspath?
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> 
> 
> Hi Steve,
> 
> I have tried your suggested code and also replaced os.path.realpath
> with os.path.abspath but still getting the same result.
> I want to know is there any workaround for retrieving the filepaths
> given only filename
> 
What, you are saying that

  os.path.exists(filename)

is returning false when the file exists? I find that hard to believe.

Please display some evidence so I can understand this.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From thorsten at thorstenkampe.de  Wed Feb 25 12:01:08 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 18:01:08 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
Message-ID: <MPG.240f97c1205218339897cd@news.individual.de>

* Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
> <thorsten at thorstenkampe.de> escribi?:
> > * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
> >> Thanks, RDM, for stating the right approach.
> >> Thanks, Steve, for teaching by example.
> >>
> >> I wonder why the email.message_from_string() method doesn't call
> >> email.header.decode_header() automatically.
> >
> > And I wonder why you would think the header contains Unicode characters
> > when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> > to label everything "Unicode" someone does not understand.
> 
> And I wonder why you would think the header does *not* contain Unicode  
> characters when it says "us-ascii"?.

Basically because it didn't contain any Unicode characters (anything 
outside the ASCII range).

Thorsten


From steve at holdenweb.com  Wed Feb 25 12:01:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:01:21 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
Message-ID: <go3thb$sm9$2@ger.gmane.org>

Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com> wrote:
>> Yes it's in Python alright, but it's not Pythonese yet. You could try
>> avoiding the getter/setter stuff, and camelCase method naming, things like
>> that, for a start.
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> 
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).
> 
If you wanted to enforce those restrictions you could just turn
attributes into properties.

> The camel-case thing I get -- I use that and this_type quite a bit,
> probably because of the inconsistency of the languages I use
> regularly, and standards at work and conventions in my hobby
> programming.

PEP 008 is the usual style recommendation.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 12:07:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 15:07:07 -0200
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
Message-ID: <op.upw255p0x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 14:50:18 -0200, Shawn Milochik <Shawn at milochik.com>  
escribi?:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com>  
> wrote:
>>
>> Yes it's in Python alright, but it's not Pythonese yet. You could try
>> avoiding the getter/setter stuff, and camelCase method naming, things  
>> like
>> that, for a start.
>
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).

I think Marco Mariani was suggesting something like this:

class Ship(object):

     def __init__(self, length):
         self._length = length

     def get_length(self):
         return self._length
     length = property(get_length)  # a read only property

-- 
Gabriel Genellina



From __peter__ at web.de  Wed Feb 25 12:18:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 25 Feb 2009 18:18:11 +0100
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
Message-ID: <go3ugf$ol7$03$1@news.t-online.com>

Steve Holden wrote:

> What, you are saying that
> 
> os.path.exists(filename)
> 
> is returning false when the file exists? I find that hard to believe.
> 
> Please display some evidence so I can understand this.

Maybe it's about access rights?

$ mkdir alpha
$ touch alpha/beta
$ python -c"import os; print os.path.exists('alpha/beta')"
True
$ chmod u-x alpha
$ python -c"import os; print os.path.exists('alpha/beta')"
False
$

I Don't know how this is handled on Windows...

Peter


From mail at timgolden.me.uk  Wed Feb 25 12:27:07 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 25 Feb 2009 17:27:07 +0000
Subject: How do I decode unicode characters in the subject
	using	email.message_from_string()?
In-Reply-To: <MPG.240f97c1205218339897cd@news.individual.de>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>	<mailman.740.1235575045.11746.python-list@python.org>	<MPG.240f84deef77395e9897cc@news.individual.de>	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
Message-ID: <49A57F6B.7090501@timgolden.me.uk>

Thorsten Kampe wrote:
> * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
>> <thorsten at thorstenkampe.de> escribi?:
>>> * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>>>> Thanks, RDM, for stating the right approach.
>>>> Thanks, Steve, for teaching by example.
>>>>
>>>> I wonder why the email.message_from_string() method doesn't call
>>>> email.header.decode_header() automatically.
>>> And I wonder why you would think the header contains Unicode characters
>>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
>>> to label everything "Unicode" someone does not understand.
>> And I wonder why you would think the header does *not* contain Unicode  
>> characters when it says "us-ascii"?.
> 
> Basically because it didn't contain any Unicode characters (anything 
> outside the ASCII range).

And I imagine that Gabriel's point was -- and my point certainly
is -- that Unicode includes all the characters *inside* the
ASCII range.


TJG


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 12:36:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 15:36:22 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
Message-ID: <op.upw4iwh5x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 15:01:08 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:
> * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe
>> <thorsten at thorstenkampe.de> escribi?:
>> > * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>> >> Thanks, RDM, for stating the right approach.
>> >> Thanks, Steve, for teaching by example.
>> >>
>> >> I wonder why the email.message_from_string() method doesn't call
>> >> email.header.decode_header() automatically.
>> >
>> > And I wonder why you would think the header contains Unicode  
>> characters
>> > when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
>> > to label everything "Unicode" someone does not understand.
>>
>> And I wonder why you would think the header does *not* contain Unicode
>> characters when it says "us-ascii"?.
>
> Basically because it didn't contain any Unicode characters (anything
> outside the ASCII range).

I think you have to revise your definition of "Unicode".

-- 
Gabriel Genellina



From blank at empty.blank  Wed Feb 25 12:36:37 2009
From: blank at empty.blank (RGK)
Date: Wed, 25 Feb 2009 12:36:37 -0500
Subject: coding style - try, except
Message-ID: <go3vj6$2mq$1@theodyn.ncf.ca>


I'm still learning, so eager to see if there is some community wisdom 
about use of the try/except structures in this situation.

I find myself with some potentially risky stuff and wrap it in a 
try/except structure with good functional results, though my code leaves 
me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.

Consider

   try:
     do something 1
     do something 2
     do something 3
     do something 4
     ...
     do something 25

   except:
     print "Oops something didn't work"


The risky things are just 1 & 2, and the others are not of concern, but 
are dependent on 1 & 2.  The alternative is to do:

   wentOkay = True
   try:
     do something 1
     do something 2

   except:
     print "Oops something didn't work"
     wentOkay = False

   if wentOkay:
     do something 3
     do something 4
      ...
     do something 25


Which seems a bit verbose, but likely the better approach.  Is there 
some other option I should be considering?

Any input appreciated :)

Ross.



From rdmurray at bitdance.com  Wed Feb 25 12:44:18 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 17:44:18 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<go3nra$71j$1@ger.gmane.org>
Message-ID: <go401h$7d7$1@ger.gmane.org>

Steve Holden <steve at holdenweb.com> wrote:
> rdmurray at bitdance.com wrote:
> > Steve Holden <steve at holdenweb.com> wrote:
> >>>>> from email.header import decode_header
> >>>>> print
> >> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
> >> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
> >> Records', 'us-ascii')]
> > 
> > It is interesting that decode_header does what I would consider to be
> > the right thing (from a pragmatic standpoint) with that particular bit
> > of Microsoft not-quite-standards-compliant brain-damage; but, removing
> > the tab is not in fact standards compliant if I'm reading the RFC
> > correctly.
> > 
> You'd need to quote me chapter and verse on that. I understood that the
> tab simply indicated continuation, but it's a *long* time since I read
> the RFCs.

Tab is not mentioned in RFC 2822 except to say that it is a valid
whitespace character.  Header folding (insertion of <cr><lf>) can
occur most places whitespace appears, and is defined in section
2.2.3 thusly:

   Each header field is logically a single line of characters comprising
   the field name, the colon, and the field body.  For convenience
   however, and to deal with the 998/78 character limitations per line,
   the field body portion of a header field can be split into a multiple
   line representation; this is called "folding".  The general rule is
   that wherever this standard allows for folding white space (not
   simply WSP characters), a CRLF may be inserted before any WSP.  For
   example, the header field:

           Subject: This is a test

   can be represented as:

           Subject: This
            is a test

   [irrelevant note elided]

   The process of moving from this folded multiple-line representation
   of a header field to its single line representation is called
   "unfolding". Unfolding is accomplished by simply removing any CRLF
   that is immediately followed by WSP.  Each header field should be
   treated in its unfolded form for further syntactic and semantic
   evaluation.

So, the whitespace characters are supposed to be left unchanged
after unfolding.

--David



From steve at holdenweb.com  Wed Feb 25 12:51:34 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:51:34 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <go401h$7d7$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>	<go3nra$71j$1@ger.gmane.org>
	<go401h$7d7$1@ger.gmane.org>
Message-ID: <go40fh$8gr$1@ger.gmane.org>

rdmurray at bitdance.com wrote:
[...]
> 
>    The process of moving from this folded multiple-line representation
>    of a header field to its single line representation is called
>    "unfolding". Unfolding is accomplished by simply removing any CRLF
>    that is immediately followed by WSP.  Each header field should be
>    treated in its unfolded form for further syntactic and semantic
>    evaluation.
> 
> So, the whitespace characters are supposed to be left unchanged
> after unfolding.
> 
That would certainly appear to be the case. Thanks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From loluengo at gmail.com  Wed Feb 25 12:51:55 2009
From: loluengo at gmail.com (Lorenzo)
Date: Wed, 25 Feb 2009 09:51:55 -0800 (PST)
Subject: This application has failed to start because the application 
	configuration is incorrect
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com> 
	<mailman.157.1234910674.11746.python-list@python.org>
Message-ID: <d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>

On 17 feb, 19:44, Mark Hammond <skippy.hamm... at gmail.com> wrote:
> On 18/02/2009 5:49 AM, Sam Clark wrote:
>
> > I am receiving the message "Thisapplicationhasfailedtostartbecause
> > theapplicationconfiguration is incorrect" when I attempt to run a
> > compiled Python program on another machine. I have used py2exe on both a
> > 2.6.1 and a 2.6.0 version of the .py and .pyw files. Everything works
> > great on the machine where Python 2.6 is loaded, but fails on machines
> > where I copy the .exe to the machine. I'm a beginner at python
> > programming. In fact this is my first packaged program. Any thoughts at
> > a beginners level would be helpful.
>
> This will be due to the C runtime library not being installed correctly
> on the target machine. ?

I had the same issue. After looking some "patch" solutions of putting
manually some dlls on the dist folder, I realized that you can fix it
by installing one of these packages, see which one fits your system:
x86
http://www.microsoft.com/downloads/details.aspx?familyid=A5C84275-3B97-4AB7-A40D-3802B2AF5FC2&displaylang=en

x64
http://www.microsoft.com/downloads/details.aspx?familyid=BA9257CA-337F-4B40-8C14-157CFDFFEE4E&displaylang=en

PS: Mark, this could be added to a kind of "Deployment" entry in
py2exe wiki, it would be useful.


From steve at holdenweb.com  Wed Feb 25 12:53:46 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:53:46 -0500
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <go40jl$8gr$2@ger.gmane.org>

RGK wrote:
> 
> I'm still learning, so eager to see if there is some community wisdom
> about use of the try/except structures in this situation.
> 
> I find myself with some potentially risky stuff and wrap it in a
> try/except structure with good functional results, though my code leaves
> me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.
> 
> Consider
> 
>   try:
>     do something 1
>     do something 2
>     do something 3
>     do something 4
>     ...
>     do something 25
> 
>   except:
>     print "Oops something didn't work"
> 
> 
> The risky things are just 1 & 2, and the others are not of concern, but
> are dependent on 1 & 2.  The alternative is to do:
> 
>   wentOkay = True
>   try:
>     do something 1
>     do something 2
> 
>   except:
>     print "Oops something didn't work"
>     wentOkay = False
> 
>   if wentOkay:
>     do something 3
>     do something 4
>      ...
>     do something 25
> 
> 
> Which seems a bit verbose, but likely the better approach.  Is there
> some other option I should be considering?
> 
> Any input appreciated :)
> 
The first form is far preferable: it expresses the logic directly and
clearly, and is much easier to read than the second, which I personally
find somewhat contorted.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From duncan-news at grisby.org  Wed Feb 25 12:55:44 2009
From: duncan-news at grisby.org (Duncan Grisby)
Date: Wed, 25 Feb 2009 17:55:44 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.730.1235567202.11746.python-list@python.org>
Message-ID: <ACfpl.43277$1M5.3814@newsfe24.ams2>

In article <mailman.730.1235567202.11746.python-list at python.org>,
David Cournapeau  <cournape at gmail.com> wrote:

[...]
>It is very unlikely the problem is in glibc - I would check your code
>carefully first :) On Linux, the following are useful:

You are right that it is extremely unlikely that the bug is in glibc.
However, it is not impossible. Several of my colleagues and I spent
months trying to track down a bug where Python would occasionally
crash with a segfault while iterating through large lists. Of course
the problem only ever happened on customer sites, and not in our lab.
I eventually tracked it down to a bug in glibc's realloc()
implementation, where once in a blue moon it would fail to copy all
the data into the newly-allocated buffer.

It turned out to be a bug that had been found before, but had been
closed as invalid a few months earlier:

  http://sources.redhat.com/bugzilla/show_bug.cgi?id=5743

The fix had then been applied about a week before I found it myself.

I'm not sure that particular fix has found it into any of the major
Linux distributions yet.

Cheers,

Duncan.

-- 
 -- Duncan Grisby         --
  -- duncan at grisby.org     --
   -- http://www.grisby.org --


From __peter__ at web.de  Wed Feb 25 13:07:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 25 Feb 2009 19:07:11 +0100
Subject: coding style - try, except
References: <go3vj6$2mq$1@theodyn.ncf.ca>
	<mailman.759.1235584507.11746.python-list@python.org>
Message-ID: <go41ca$ghs$01$1@news.t-online.com>

Steve Holden wrote:

> RGK wrote:
>> 
>> I'm still learning, so eager to see if there is some community wisdom
>> about use of the try/except structures in this situation.
>> 
>> I find myself with some potentially risky stuff and wrap it in a
>> try/except structure with good functional results, though my code leaves
>> me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.
>> 
>> Consider
>> 
>>   try:
>>     do something 1
>>     do something 2
>>     do something 3
>>     do something 4
>>     ...
>>     do something 25
>> 
>>   except:
>>     print "Oops something didn't work"

If you don't want a specific treatment for errors anticipated in 1 and 2
there's no need for try...except at this level at all. Just pass control up
the stack.

>> The risky things are just 1 & 2, and the others are not of concern, but
>> are dependent on 1 & 2.  The alternative is to do:
>> 
>>   wentOkay = True
>>   try:
>>     do something 1
>>     do something 2
>> 
>>   except:
>>     print "Oops something didn't work"
>>     wentOkay = False
>> 
>>   if wentOkay:
>>     do something 3
>>     do something 4
>>      ...
>>     do something 25
>> 
>> 
>> Which seems a bit verbose, but likely the better approach.  Is there
>> some other option I should be considering?
>> 
>> Any input appreciated :)
>> 
> The first form is far preferable: it expresses the logic directly and
> clearly, and is much easier to read than the second, which I personally
> find somewhat contorted.

How about

try:
    # do something that may fail in a way you anticipate
    do something 1
    do something 2
except SpecificError:
    deal with the problem or reraise
else:
    # no errors above
    do something 3...25

Peter


From clp2 at rebertia.com  Wed Feb 25 13:08:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 25 Feb 2009 10:08:55 -0800
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <50697b2c0902251008u1756435tac03b3322e5a694a@mail.gmail.com>

On Wed, Feb 25, 2009 at 9:36 AM, RGK <blank at empty.blank> wrote:
>
> I'm still learning, so eager to see if there is some community wisdom about
> use of the try/except structures in this situation.
>
> I find myself with some potentially risky stuff and wrap it in a try/except
> structure with good functional results, though my code leaves me a bit
> uneasy. Maybe it's just esoteric, but your input is appreciated.
>
> Consider
>
> ?try:
> ? ?do something 1
> ? ?do something 2
> ? ?do something 3
> ? ?do something 4
> ? ?...
> ? ?do something 25
>
> ?except:
> ? ?print "Oops something didn't work"
>
>
> The risky things are just 1 & 2, and the others are not of concern, but are
> dependent on 1 & 2. ?The alternative is to do:
>
> ?wentOkay = True
> ?try:
> ? ?do something 1
> ? ?do something 2
>
> ?except:
> ? ?print "Oops something didn't work"
> ? ?wentOkay = False
>
> ?if wentOkay:
> ? ?do something 3
> ? ?do something 4
> ? ? ...
> ? ?do something 25
>
>
> Which seems a bit verbose, but likely the better approach. ?Is there some
> other option I should be considering?

Yes. try-except-*else*.

try:
    do_something_1()
    do_something_2()
except:
    print "Houston, we have a problem"
else: #runs only if no exception was thrown
    do_something_3()
    do_something_4()
    et_cetera()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From xahlee at gmail.com  Wed Feb 25 13:18:17 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 25 Feb 2009 10:18:17 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com>
Message-ID: <15818a58-bcc6-4163-982f-d5534b087a6c@o36g2000yqh.googlegroups.com>

On Feb 25, 3:34 am, nick_keighley_nos... at hotmail.com wrote:
> the nasty cons then only appears in a single function which
> you can hide in a library

I think the following answers that.

Q: If you don't like cons, lisp has arrays and hashmaps, too.

A: Suppose there's a lang called gisp. In gisp, there's cons but also
fons. Fons are just like cons except it has 3 cells with 3 accessors:
car, cbr, cdr. Now, gisp is a old lang, the fons are deeply rooted in
the lang. Every some 100 lines of code you'll see a use of fons with
its extra accessor cbr, or any one of the cbaar, cdabr, cbbar, cbbbar,
etc. You got annoyed by this. You as a critic, complains that fons is
bad. But then some gisp fanatics retorts: ?If you don't like fons,
gisp has cons, too!?.

You see, by ?having something too?, does not solve the problem of
pollution. Sure, you can use just cons in gisp, but every lib or
other's code you encounter, there's a invasion of fons with its cbar,
cbbar, cbbbar. The problem created by fons does not go away by ?having
cons too?.

above is from

? Fundamental Problems of Lisp
  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html

---------

> I read it. Your point seems to be "cons becomes difficult
> with deeply nested structures". Could you give an example?

There are few examples in these articles:

? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
Nested Notations
  http://xahlee.org/UnixResource_dir/writ/notations.html

the above, 3rd section, gives detail about the problems of fully
nested syntax. In particular, it shows a source code snippet of
language with fully nested syntax, but is not lisp, so that lispers
can get a fresh impression.

? A Ruby Illustration of Lisp Problems
  http://xahlee.org/UnixResource_dir/writ/lisp_problems_by_ruby.html

the above, is a concrete example of showing how full nesting is
cumbersome, by constrasting a simple program in Ruby and lisp.

? Why Lisp Do Not Have A Generic Copy-List Function
  http://xahlee.org/UnixResource_dir/writ/lisp_equal_copy_list.html

the above, shows the cons problem, by looking Kent Pitman's article
with a different perspective.

A short Plain Text Excerpt of the ruby article cited above follows.
------------------------------

More specifically, 2 fundamental problems of lisp i feel this ruby
example illustrates well:

? the cons impedes many aspects of lists. e.g. difficult to learn,
confusing, hard to use, prevent development of coherent list
manipulation functions.

? nested syntax impedes the functional programing paradigm of function
chaining, esp when each function has 2 or more arguments (e.g. map).

here's a short summary of the nesting problem:

(map f x) ; 1 level of chaining
(map g (map f x)) ; 2 levels
(map h (map g (map f x))) ; 3 levels

compare:

x | f | g | h   ----> unix pipe
x // f // g // h   ----> Mathematica
h @ g @ f @ x    ----> Mathematica
x.f.g.h        -------> various OOP langs, esp Ruby, javascript
h g f x       -------> some functional langs, Haskell, Ocaml

The way the above works is that each of f, g, h is a lambda themselves
that maps. (that is, something like ?(lambda (y) (map f y))?)

Note, that any of the f, g, h may be complex pure functions (aka
lambda).  Because in lisp, each lambda itself will in general have
quite a lot nested parens (which cannot be avoided), so this makes any
chaining of functions of 2 args, for more than 2 or 3 levels of
nesting, unusable for practical coding. One must define the functions
separately and just call their names, or use function composition with
lambda (which gets complex quickly). One major aspect of this problem
is that the scope of vars becomes hard to understand in the deep
nested source code. This is worse in elisp, because emacs is
dynamically scoped, so you have to avoid using var of same name.

 Xah
?http://xahlee.org/

?



From thorsten at thorstenkampe.de  Wed Feb 25 13:19:35 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 19:19:35 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
	<mailman.755.1235582817.11746.python-list@python.org>
Message-ID: <MPG.240faa1e187165a99897ce@news.individual.de>

* Tim Golden (Wed, 25 Feb 2009 17:27:07 +0000)
> Thorsten Kampe wrote:
> > * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
> >> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
[...]
> >>> And I wonder why you would think the header contains Unicode characters
> >>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> >>> to label everything "Unicode" someone does not understand.
> >> And I wonder why you would think the header does *not* contain Unicode  
> >> characters when it says "us-ascii"?.
> > 
> > Basically because it didn't contain any Unicode characters (anything 
> > outside the ASCII range).
> 
> And I imagine that Gabriel's point was -- and my point certainly
> is -- that Unicode includes all the characters *inside* the
> ASCII range.

I know that this was Gabriel's point. And my point was that Gabriel's 
point was pointless. If you call any text (or character) "Unicode" then 
the word "Unicode" is generalized to an extent where it doesn't mean 
anything at all anymore and becomes a buzz word.

With the same reason you could call ASCII an Unicode encoding (which it 
isn't) because all ASCII characters are Unicode characters (code 
points). Only encodings that cover the full Unicode range can reasonably 
be called Unicode encodings.

The OP just saw some "weird characters" in the email subject and thought 
"I know. It looks weird. Must be Unicode". But it wasn't. It was good 
ole ASCII - only Quoted Printable encoded.


Thorsten


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 13:21:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 16:21:58 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<go3nra$71j$1@ger.gmane.org> <go401h$7d7$1@ger.gmane.org>
Message-ID: <op.upw6mwchx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 15:44:18 -0200, <rdmurray at bitdance.com> escribi?:

> Tab is not mentioned in RFC 2822 except to say that it is a valid
> whitespace character.  Header folding (insertion of <cr><lf>) can
> occur most places whitespace appears, and is defined in section
> 2.2.3 thusly: [...]
> So, the whitespace characters are supposed to be left unchanged
> after unfolding.

Yep, there is an old bug report sleeping in the tracker about this...

-- 
Gabriel Genellina



From Scott.Daniels at Acm.Org  Wed Feb 25 13:22:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 25 Feb 2009 10:22:46 -0800
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <SMidnb1GXJFHFjjUnZ2dnUVZ_gKWnZ2d@pdx.net>

RGK wrote:
> I'm still learning, so eager to see if there is some community wisdom 
> about use of the try/except structures in this situation....
>   try:
>     do something 1
>     do something 2
>     do something 3
>     do something 4
>     ...
>     do something 25
>   except:
>     print "Oops something didn't work"
> 
> The risky things are just 1 & 2, and the others are not of concern, but 
> are dependent on 1 & 2.  The alternative is to do:
> 
>   wentOkay = True
>   try:
>     do something 1
>     do something 2
>   except:
>     print "Oops something didn't work"
>     wentOkay = False
>   if wentOkay:
>     do something 3
>     do something 4
>      ...
>     do something 25
> Which seems a bit verbose, but likely the better approach.  Is there 
> some other option I should be considering?
What's wrong with:
     try:
         do something 1
         do something 2
     except (AttributeError, ValueError), why: # Don't use bare except
         print "Oops something didn't work: %s" % why
     else:
         do something 3
         do something 4
         ...
         do something 25
--Scott David Daniels
Scott.Daniels at Acm.Org


From lists at cheimes.de  Wed Feb 25 13:26:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 19:26:23 +0100
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <go42gf$gc9$1@ger.gmane.org>

RGK wrote:
> Any input appreciated :)

How about:

import logging

try:
   # run your function
   some_function()
except Exception:
   # except only the exceptions you *really* want to catch
   # at most you should except "Exception" since it doesn't
   # catch KeyboardInterrupt and SystemExit
   logging.exception("An error has occured")
   # logging is preferred over a simple print because it
   # also prints out a nice traceback
else:
   # the else block is reached when no exception has occured
   some_other()
finally:
   # the finally block is *always* executed at least
   # use it to clean up some resources
   some_cleanup_code()

Christian



From Shawn at Milochik.com  Wed Feb 25 13:33:48 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 13:33:48 -0500
Subject: "Battleship" style game
In-Reply-To: <op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <2dc0c81b0902251033m79dd4157x401283d993214e4@mail.gmail.com>

Thanks. I wasn't aware of the property() function, but I read up on
it. I modified the Vessels.py file, but not the board file (except
where necessary to handle the changes made to Vessels. Is this better?

http://shawnmilo.com/ships/ships2/


From chrysn at fsfe.org  Wed Feb 25 13:48:16 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Wed, 25 Feb 2009 19:48:16 +0100
Subject: variables bound in moudules are None when module is not
	completely imported
In-Reply-To: <20090224142719.GA27379@hephaistos.amsuess.com>
References: <20090224142719.GA27379@hephaistos.amsuess.com>
Message-ID: <20090225184816.GC28923@hephaistos.amsuess.com>

On Tue, Feb 24, 2009 at 03:27:19PM +0100, chrysn at fsfe.org wrote:
> * is there a workaround?
>     * especially, is there a workaround that works w/o rewriting the
>       modules that raise the exceptions? (otherwise, wrapping all the
>       stuff called in the __name__=="__main__" wrapper into a main()
>       function and then calling that would trivially solve that)

update: i've found one, but this only works if the exception is raised
at a point determined by the outside.

to explain why this is applicable: in the examples, i used `1/0` to
raise a zero division exception inside the module whose scope i want to
preserve. in my practical application, the exception is thrown by a
function that was previously prepared by the outside module and monkey
patched to where the inner module is expected to call a method from (in
my case, the gtk main loop).

now if the function raising the exception saves both
`sys._getframe().f_back.f_globals` and a .copy() of that dictionary, the
original dictionary can later (when the exception is caught and the
module's globals are all None) be .update()d with the copy, and the
original module globals are restored.

as said, this is just a workaround -- the original question still
remains open.

regards
chrysn

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From gagsl-py2 at yahoo.com.ar  Wed Feb 25 13:59:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 16:59:17 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
	<mailman.755.1235582817.11746.python-list@python.org>
	<MPG.240faa1e187165a99897ce@news.individual.de>
Message-ID: <op.upw8c3jkx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 16:19:35 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:
> * Tim Golden (Wed, 25 Feb 2009 17:27:07 +0000)
>> Thorsten Kampe wrote:
>> > * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> >> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe
> [...]
>> >>> And I wonder why you would think the header contains Unicode  
>> characters
>> >>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a  
>> tendency
>> >>> to label everything "Unicode" someone does not understand.
>> >> And I wonder why you would think the header does *not* contain  
>> Unicode
>> >> characters when it says "us-ascii"?.
>> >
>> > Basically because it didn't contain any Unicode characters (anything
>> > outside the ASCII range).
>>
>> And I imagine that Gabriel's point was -- and my point certainly
>> is -- that Unicode includes all the characters *inside* the
>> ASCII range.
>
> I know that this was Gabriel's point. And my point was that Gabriel's
> point was pointless. If you call any text (or character) "Unicode" then
> the word "Unicode" is generalized to an extent where it doesn't mean
> anything at all anymore and becomes a buzz word.

If it's text, it should use Unicode. Maybe not now, but in a few years, it  
will be totally unacceptable not to properly use Unicode to process  
textual data.

> With the same reason you could call ASCII an Unicode encoding (which it
> isn't) because all ASCII characters are Unicode characters (code
> points). Only encodings that cover the full Unicode range can reasonably
> be called Unicode encodings.

Not at all. ASCII is as valid as character encoding ("coded character set"  
as the Unicode guys like to say) as ISO 10646 (which covers the whole  
range).

> The OP just saw some "weird characters" in the email subject and thought
> "I know. It looks weird. Must be Unicode". But it wasn't. It was good
> ole ASCII - only Quoted Printable encoded.

Good f*cked ASCII is Unicode too.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 14:05:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 17:05:28 -0200
Subject: variables bound in moudules are None when module is not
	completely imported
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
Message-ID: <op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 16:48:16 -0200, <chrysn at fsfe.org> escribi?:

> update: i've found one, but this only works if the exception is raised
> at a point determined by the outside.
>
> to explain why this is applicable: in the examples, i used `1/0` to
> raise a zero division exception inside the module whose scope i want to
> preserve. in my practical application, the exception is thrown by a
> function that was previously prepared by the outside module and monkey
> patched to where the inner module is expected to call a method from (in
> my case, the gtk main loop).
>
> now if the function raising the exception saves both
> `sys._getframe().f_back.f_globals` and a .copy() of that dictionary, the
> original dictionary can later (when the exception is caught and the
> module's globals are all None) be .update()d with the copy, and the
> original module globals are restored.

That makes a strange situation where the module doesn't exist in  
sys.modules but its globals are still alive...

> as said, this is just a workaround -- the original question still
> remains open.

I'd try to move all the global stuff in that module into a function,  
"init". Importing the module will always succeed - you have to manually  
call init() after importing it.

-- 
Gabriel Genellina



From aisaac at american.edu  Wed Feb 25 14:07:54 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 25 Feb 2009 14:07:54 -0500
Subject: Free Python Training: Washington, DC (3/3-5)
In-Reply-To: <go3k62$lvs$1@panix3.panix.com>
References: <mailman.729.1235566709.11746.python-list@python.org>
	<go3k62$lvs$1@panix3.panix.com>
Message-ID: <mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>

Great idea, but if you do it again, a bit
more lead time would be helpful.

Cheers,
Alan Isaac


From blank at empty.blank  Wed Feb 25 14:12:01 2009
From: blank at empty.blank (RGK)
Date: Wed, 25 Feb 2009 14:12:01 -0500
Subject: coding style - try, except
In-Reply-To: <mailman.760.1235585341.11746.python-list@python.org>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
	<mailman.760.1235585341.11746.python-list@python.org>
Message-ID: <go4562$5va$1@theodyn.ncf.ca>


I'm glad I asked :)

Thanks all who posted for your replies, the else-statement is a nice 
option.

Python again comes through to deal with those pesky feelings that 
something could be better :)

Ross.



Chris Rebert wrote:

> Yes. try-except-*else*.
> 
> try:
>     do_something_1()
>     do_something_2()
> except:
>     print "Houston, we have a problem"
> else: #runs only if no exception was thrown
>     do_something_3()
>     do_something_4()
>     et_cetera()
> 
> Cheers,
> Chris
> 


From steve at holdenweb.com  Wed Feb 25 14:31:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 14:31:49 -0500
Subject: Free Python Training: Washington, DC (3/3-5)
In-Reply-To: <mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>
References: <mailman.729.1235566709.11746.python-list@python.org>	<go3k62$lvs$1@panix3.panix.com>
	<mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>
Message-ID: <go46bh$vhl$1@ger.gmane.org>

Alan G Isaac wrote:
> Great idea, but if you do it again, a bit
> more lead time would be helpful.
> 
Appreciate that. Last-minute idea.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Wed Feb 25 15:15:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 25 Feb 2009 21:15:40 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.763.1235586832.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
Message-ID: <70ln7dFcv6phU1@mid.uni-berlin.de>

Shawn Milochik schrieb:
> Thanks. I wasn't aware of the property() function, but I read up on
> it. I modified the Vessels.py file, but not the board file (except
> where necessary to handle the changes made to Vessels. Is this better?
> 
> http://shawnmilo.com/ships/ships2/


Not really. The point about properties is that you *can* make attribute 
access trigger getter or setter code.

But not that you do unless there is an actual reason for that. The way 
you do it now is simply introducing clutter, without benefit. Your class 
would be half the current size - without loss of functionality.



Diez


From martin at v.loewis.de  Wed Feb 25 15:19:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 25 Feb 2009 21:19:41 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<49a1b17d$0$28748$9b622d9e@news.freenet.de>
	<49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49a5a7dd$0$30218$9b622d9e@news.freenet.de>

>> On a 32-bit system, the dictionary can have up to 2**31 slots,
>> meaning that the maximum number of keys is slightly smaller
>> (about 2**30).
> 
> Which, in practice, means that the size is limited by the available memory.

Right. Each slot takes 12 bytes, so the storage for the slots alone
would consume all available address space.

>From that point of view, you can't possibly have more than 314M slots
in a 32-bit address space (roughly 2**28).

Regards,
Martin


From vincent at vincentdavis.net  Wed Feb 25 15:20:28 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 25 Feb 2009 13:20:28 -0700
Subject: PYTHONPATH on Mac 10.5
Message-ID: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>

I have looked around for a good howto setup PYTHONPATH on Mac os x
10.5 Although I get many results I am not sure which is correct. I am not
sure if it is different for 10.5 over previous versions. Does anyone know of
a well documented set of instructions.
In my python scripts I specify which python I want to use like this
#!/Library/Frameworks/Python.framework/Versions/4.1.30101/bin/python

Is there a way to specify a module location or working directory? Which is
best? Or should I just add location to PYTHONPATH?


Thanks
Vincent Davis
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From irmen.NOSPAM at xs4all.nl  Wed Feb 25 15:39:57 2009
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Wed, 25 Feb 2009 21:39:57 +0100
Subject: Python Image Library IOError - cannot find JPEG decoder?
In-Reply-To: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
References: <mailman.674.1235496906.11746.python-list@python.org>
	<179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
Message-ID: <49a5aca0$0$193$e4fe514c@news.xs4all.nl>

wongobongo wrote:
> On Feb 24, 9:34 am, Dario Traverso <traver... at gmail.com> wrote:
>> I've been trying to install the Python Image Library  (PIL) on my Mac  
>> OSX Leopard laptop, but have been running into some difficulties.
>>
>> I've built the library, using the included setup.py  script. The build  
>> summary checks out ok, and sounds the option libraries to all be  
>> found. I grabbed both libjpeg and freetype2  using  fink.
>>

I did a similar thing, but not using Fink, on my mac (running osx 10.4)
I documented the procedure I had to take to get it to work:
http://www.razorvine.net/frog/user/irmen/article/2008-08-02/127

It's in Dutch but you can probably figure it out.
I guess since you were on 10.5 that you have to adapt the
'DEPLOMENT_TARGET' variable in a suitable manner.

Hope it helps,

--irmen


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb 25 15:48:45 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 21:48:45 +0100
Subject: python sql query in django
In-Reply-To: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
Message-ID: <49a5bc40$0$2662$426a74cc@news.free.fr>

May a ?crit :
> On Feb 24, 10:36 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>> Thanks for all your suggestions.  From what I've experienced in Django
>>> and now that I know a little more about how Python functions, I will
>>> probably use a combination of PHP and Django, instead of trying to get
>>> Python to do the web portion of my project.  Thanks again!
>> That sounds like the worst idea. Django's ORM is good when used from
>> within django, because of all the additional goodies like the admin
>> interface.
>>
>> But if you are going to do the webfrontend using PHP, what part is left
>> for django? If it's only the ORM (for whatever you still use that
>> anyway), there are better alternatives - SQLAlchemy, and SQLObject, for
>> Python. They are more powerful and not interwoven with django.
>>
>> If you are going to hand-code the interface in PHP, I fail to see though
>> why you don't do that in Django directly. You are not forced to use the
>> Admin-interface.
>>
>> Diez
> 
> Hello Diez,
> 
> I think Django is fabulous for the admin-interface, a simple text
> search and template inheritance. 

And I think you really don't get what Django is good for.

> I will use Django for all of those.
> What I'm not getting an answer to and cannot find an example of is a
> complex search, where I have to retrieve data from multiple tables,
> combine the data, remove the duplicates, etc 

Django's ORM is mostly a wrapper above the db-api. It's intended to make 
most common db access a no-brainer, not to replace full-blown SQL for 
complex things. Now the good news is that you *still* can drop to a 
lower raw-sql level - the one you'd get using either PHP or Python's 
db-api - for more complex things. IOW, PHP won't buy you anything here.

>  The code that started this thread is only a small piece
> of the complex data retrieval I need to do.

The "code that started this thread" is a total no-brainer using Django 
(as you would know by now if you had reposted your question on django's 
group - or even just read the FineManual, where this use case is fully 
documented), and doesn't even require going down to raw sql.

>  PHP is great for writing
> complex SQL queries right in the HTML template

What the .... a complex SQL query has to do in a template anyway ??? 
Sorry, but what you're saying here is that PHP is great for writing 
unmaintainable spaghetti code. FWIW, even PHP coders are trying to get 
out of this kind of mess nowadays.



From Shawn at Milochik.com  Wed Feb 25 15:54:46 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 15:54:46 -0500
Subject: "Battleship" style game
In-Reply-To: <70ln7dFcv6phU1@mid.uni-berlin.de>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
Message-ID: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>

On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:

> Not really. The point about properties is that you *can* make attribute
> access trigger getter or setter code.
>
> But not that you do unless there is an actual reason for that. The way you
> do it now is simply introducing clutter, without benefit. Your class would
> be half the current size - without loss of functionality.
>
>
>
> Diez
> --
> http://mail.python.org/mailman/listinfo/python-list
>

It is true that it would be fewer lines of code with the same
functionality, but it's better practice to have that framework in
place so that any changes made in the future wouldn't break any of the
code accessing my class. Obviously this is a fairly simple game that
has a fixed set of rules, but I'm trying to cultivate good habits, and
I don't think that doing it this way is anti-Pythonic.

Unless, of course, anything I said is wrong, which is always possible.
If I'm missing a bigger-picture idea, I'd like to know about it.

Thanks,
Shawn


From steve at holdenweb.com  Wed Feb 25 16:07:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 16:07:36 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>	<mailman.763.1235586832.11746.python-list@python.org>	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <go4bv6$lu8$1@ger.gmane.org>

Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.
> 
The point of using property() is that you can start out using attribute
access on its own (which is the standard Python way to do things:
getters and setters are seen by most as redundant code).

Once you need programmed access on read and/or write, leave the client
code (the code that accesses the attributes) as it is, but turn the
attributes into properties so that the functions are invoked
automatically on attribute-style access.

So I believe what Diez was saying is that by using properties in your
existing code you are getting the worst of both worlds - unnecessarily
complex objects, and code that uses those objects by calling methods
when it could be accessing attributes (or properties - depending on the
implementation). At least this is true of your Ship test code.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jcd at sdf.lonestar.org  Wed Feb 25 16:14:58 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Wed, 25 Feb 2009 16:14:58 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <1235596498.7621.8.camel@aalcdl07>

On Wed, 2009-02-25 at 15:54 -0500, Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
> > Not really. The point about properties is that you *can* make attribute
> > access trigger getter or setter code.
> >
> > But not that you do unless there is an actual reason for that. The way you
> > do it now is simply introducing clutter, without benefit. Your class would
> > be half the current size - without loss of functionality.
> >
> >
> >
> > Diez
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.
> 

The piece you're missing is exactly why properties are so cool.

They take what looks like attribute access from the client side, and
pass it through a method.  So while you can add any sort of changes you
want to make can be made without breaking any client code.  To them, it
still looks like attribute access.

class Foo(object):
    a = 4

class Bar(object):
    def __init__(self):
        self._a = 4

    def _get_a(self):
        return self._a

    def _set_a(self, value):
        if not value % 2:
            self._a = value
    a = property(_get_a, _set_a)

>>> foo = Foo()
>>> foo.a
4
>>> foo.a = 5
>>> foo.a
5
>>> bar = Bar()
>>> bar.a
4
>>> bar.a = 5
>>> bar.a
4
>>> bar.a = 6
>>> bar.a
6

> Thanks,
> Shawn
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From deets at nospam.web.de  Wed Feb 25 16:32:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 25 Feb 2009 22:32:53 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.769.1235595290.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>	<mailman.763.1235586832.11746.python-list@python.org>	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<mailman.769.1235595290.11746.python-list@python.org>
Message-ID: <70lro5Fdnc6aU1@mid.uni-berlin.de>

Shawn Milochik schrieb:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.

You miss that Java has no properties, and thus forces prorgammers to 
wrap all attribute-access into getter/setters - just in case one wants 
something other than pure attribute access in some distant future to come.

In Python this is not needed. If something starts as an attribute, and 
then evolves so that it needs more complex logic when being accessed, 
you introduce a property of the same name.


Don't waste time coding for a future you can't even pretend to know. Do 
what is needed to solve the actual problem.


Diez


From emile at fenx.com  Wed Feb 25 16:35:34 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 25 Feb 2009 13:35:34 -0800
Subject: File Path retrieving problem
In-Reply-To: <go3ugf$ol7$03$1@news.t-online.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com>
Message-ID: <go4djd$s0j$1@ger.gmane.org>

Peter Otten wrote:
> Maybe it's about access rights?
> 
> $ mkdir alpha
> $ touch alpha/beta
> $ python -c"import os; print os.path.exists('alpha/beta')"
> True
> $ chmod u-x alpha
> $ python -c"import os; print os.path.exists('alpha/beta')"
> False
> $
> 
> I Don't know how this is handled on Windows...
> 

Here's one way....

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\>mkdir alpha
C:\>touch alpha\beta  # cygwin at work here...

C:\>python -c"import os; print os.path.exists('alpha/beta')"
True

C:\>cacls alpha /E /R "Everyone"
processed dir: C:\alpha
C:\>cacls alpha /E /R "Users"
processed dir: C:\alpha
C:\>cacls alpha /E /R "Administrators"
processed dir: C:\alpha

C:\>python -c"import os; print os.path.exists('alpha/beta')"
False



From invalid at invalid  Wed Feb 25 16:39:09 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 25 Feb 2009 15:39:09 -0600
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<mailman.769.1235595290.11746.python-list@python.org>
	<70lro5Fdnc6aU1@mid.uni-berlin.de>
Message-ID: <LN2dnfGSU8TgJzjUnZ2dnUVZ_sLinZ2d@posted.visi>

On 2009-02-25, Diez B. Roggisch <deets at nospam.web.de> wrote:

> Don't waste time coding for a future you can't even pretend to
> know. Do what is needed to solve the actual problem.

Premature obfuscation is even worse than premature optimization.

-- 
Grant Edwards                   grante             Yow! Well, O.K.
                                  at               I'll compromise with my
                               visi.com            principles because of
                                                   EXISTENTIAL DESPAIR!


From Olivier.Darge at gmail.com  Wed Feb 25 17:03:22 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Wed, 25 Feb 2009 14:03:22 -0800 (PST)
Subject: Python Image Library IOError - cannot find JPEG decoder?
References: <mailman.674.1235496906.11746.python-list@python.org>
Message-ID: <f86fbd98-a000-4c71-ad08-ac5d22bf8162@q9g2000yqc.googlegroups.com>

On 24 f?v, 18:34, Dario Traverso <traver... at gmail.com> wrote:
> I've been trying to install the Python Image Library ?(PIL) on my Mac ?
> OSX Leopard laptop, but have been running into some difficulties.
>
> I've built the library, using the included setup.py ?script. The build ?
> summary checks out ok, and sounds the option libraries to all be ?
> found. I grabbed both libjpeg and freetype2 ?using ?fink.

I did'nt build it, maybe you don't want too.
I used the PIL package for Python 2.5 listed here:
http://pythonmac.org/packages/py25-fat/index.html


hth,
Olivier


From mobiledreamers at gmail.com  Wed Feb 25 17:24:55 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Wed, 25 Feb 2009 14:24:55 -0800
Subject: [Tutor] Accessing callers context from callee method
In-Reply-To: <78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
	<78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>
Message-ID: <c1870d60902251424x3a499dc3t3b0b1274e7859e9e@mail.gmail.com>

i found the solution
This is my first attempt at memcaching html page using cheetah
since cheetah render needs locals() i use getCallerInfo() to get the
locals() and send to memcached
let me know if it is possible to better do this
*notice getCallerInfo
*

*utils.py*
@log_time_func
def renderpage(key, htmlfile, deleteafter=3600):
    from globaldb import mc
    try:page = mc.get(key)
    except:
        page=None
        clogger.info('except error mc.get '+ key)
    if not page:
        clogger.info(key+ ' rendering cheetah page')
        terms = getCallerInfo(1)
        #print terms
        page = str(web.render(htmlfile, asTemplate=True, terms=terms))
        try:mc.set(key, page, deleteafter)
        except:
            clogger.info('except error mc.set '+ key)
    return page

@log_time_func
@memcachethis
def mcrenderpage(key, htmlfile, deleteafter=3600):
    terms = getCallerInfo(2)
    #print terms
    return str(web.render(htmlfile, asTemplate=True, terms=terms))

def getCallerInfo(decorators=0):
    '''returns locals of caller using frame.optional pass number of
decorators\nFrom Dig deep into python internals
http://www.devx.com/opensource/Article/31593/1954'<http://www.devx.com/opensource/Article/31593/1954%27>
''
    f = sys._getframe(2+decorators)
    args = inspect.getargvalues(f)
    return args[3]

*Usage*
        key=facebookstuff.APP_NAME+'newstart'+str(uid)
        return utils.renderpage(key, 'pick.html')



-- 
Bidegg worlds best auction site
http://bidegg.com
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From exarkun at divmod.com  Wed Feb 25 17:31:55 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 25 Feb 2009 17:31:55 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <20090225223155.12853.747455496.divmod.quotient.13878@henry.divmod.com>

On Wed, 25 Feb 2009 15:54:46 -0500, Shawn Milochik <shawn at milochik.com> wrote:
>On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
>
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>It is true that it would be fewer lines of code with the same
>functionality, but it's better practice to have that framework in
>place so that any changes made in the future wouldn't break any of the
>code accessing my class. Obviously this is a fairly simple game that
>has a fixed set of rules, but I'm trying to cultivate good habits, and
>I don't think that doing it this way is anti-Pythonic.
>
>Unless, of course, anything I said is wrong, which is always possible.
>If I'm missing a bigger-picture idea, I'd like to know about it.

Much better practice would be writing unit tests for the behavior you
want.  This is a vastly greater measure of protection against future
maintenance introducing bugs than the restrictions you're adding to
your implementation.  So if you're looking for good habits to pick up,
start with unit testing.  Your test.py files show you're at least
thinking about testing, but you should take a look at something like
the `unittest? module in the standard library and take things to the
next level.

Jean-Paul


From steve at pearwood.info  Wed Feb 25 18:08:25 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Thu, 26 Feb 2009 10:08:25 +1100
Subject: variable length tuple assignment
References: <70kgjnFbqktdU1@mid.dfncis.de>
	<50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
	<mailman.726.1235561721.11746.python-list@python.org>
Message-ID: <01b5c4c2$0$20652$c3e8da3@news.astraweb.com>

Tim Chase wrote:

> As an aside, as of the last time I read the PEP[1] on this, I
> believe it exhausts (or attempts to exhaust) any iterator.  IMHO,
> I think this exhausting is a bad idea because it prevents things like
> 
>    def numbers(start=0):
>      i = start
>      while True:
>        yield i
>        i += 1
> 
>    CONST_A, CONST_B, CONST_C, *rest = numbers()
> 
> which will hang in current Py3.0 until you blow a stack or
> overrun your heap somewhere because it will try to exhaust the
> infinite loop.  

But what else can it do? Do you expect Python to read your mind and
magically know when you intend to use rest and when you're intending to
just throw it away?

Perhaps Python could do that, via static analysis -- if rest is never used
again, don't bother exhausting the iterator. But that will lead to
differences in iterators that have side-effects. It will also have a subtle
difference in behaviour here:

it = xrange(5)  # for example
a, b, c, *rest = it
L = list(it)  # L is now [3, 4]

versus

a, b, c, *rest = xrange(5)
parrot(rest)
L = list(it)  # L is now []


> It also changes the type from iter() to list() 
> for the remaining content (not as grevious).

But that's what unpacking does. It would be a major semantic change for 

x, *s = some_iterator

to make s an alias of some_iterator. And why would you want it to? If you
do, just do this:

x, s = some_iterator.next(), some_iterator



-- 
Steven



From deets at nospam.web.de  Wed Feb 25 18:12:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 26 Feb 2009 00:12:33 +0100
Subject: python sql query in django
In-Reply-To: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
Message-ID: <70m1j1Fe33teU1@mid.uni-berlin.de>

> I think Django is fabulous for the admin-interface, a simple text
> search and template inheritance.  I will use Django for all of those.
> What I'm not getting an answer to and cannot find an example of is a
> complex search, where I have to retrieve data from multiple tables,
> combine the data, remove the duplicates, etc between a web page and
> the database.  The code that started this thread is only a small piece
> of the complex data retrieval I need to do.  PHP is great for writing
> complex SQL queries right in the HTML template and I know exactly what
> it is doing.

First of all, mixing technologies without need is most of the times a 
bad idea - so if it is really the case that you can't solve all of your 
issues in django, you shouldn't use it at all, but solve them in PHP.


But to be honest - I doubt that django isn't capable of solving your 
problem.

See

http://docs.djangoproject.com/en/dev/topics/db/queries/#topics-db-queries

for a introduction to the multitude of query-options. I doubt that your 
rather simple m:n-relationship is covered there.


I myself use SQLAlchemy, and that can for sure query and filter those 
relationships.

Diez


From deets at nospam.web.de  Wed Feb 25 18:14:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 26 Feb 2009 00:14:28 +0100
Subject: python sql query in django
In-Reply-To: <70m1j1Fe33teU1@mid.uni-berlin.de>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
	<70m1j1Fe33teU1@mid.uni-berlin.de>
Message-ID: <70m1mkFe33teU2@mid.uni-berlin.de>


> for a introduction to the multitude of query-options. I doubt that your 
> rather simple m:n-relationship is covered there.

s/is/isn't/

Diez



From chrysn at fsfe.org  Wed Feb 25 18:24:33 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Thu, 26 Feb 2009 00:24:33 +0100
Subject: variables bound in moudules are None when module is not
	completely imported
In-Reply-To: <op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
	<op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <20090225232433.GD28923@hephaistos.amsuess.com>

On Wed, Feb 25, 2009 at 05:05:28PM -0200, Gabriel Genellina wrote:
> I'd try to move all the global stuff in that module into a function,  
> "init". Importing the module will always succeed - you have to manually  
> call init() after importing it.

i normally do that anyway and would also have done so here (afaik, it's
best practice anyway), but this is in this case not possible as the
modules in question are not under my control at all. as pep 299 has been
turned down, this can't really be considered a bug of those files.

anyway, it would just be another workaround around the globals
disappearing.

> That makes a strange situation where the module doesn't exist in  
> sys.modules but its globals are still alive...

is this a known bug? i mean from a garbage collection / refcount point
of view, at least everything that is still referenced somewhere should
be preserved.

thanks
chrysn

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From LuHe at gmx.at  Wed Feb 25 18:57:25 2009
From: LuHe at gmx.at (Lukas Hetzenecker)
Date: Thu, 26 Feb 2009 00:57:25 +0100
Subject: logging.Handler not working with QThreads
Message-ID: <200902251627.16827.LuHe@gmx.at>

Hello,

I created a QTextEdit where I wanted to display log messages.
A logging.Handler should do this job.

It worked with one thread well, but when I start a QThread the text on all 
widgets is removed and I get many errors in my konsole:

X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0

.. and so on

I attatched a small example to this mail.

Could anybody tell me what I'm doing wrong?
Thanks for you help,
Lukas


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From skippy.hammond at gmail.com  Wed Feb 25 19:35:55 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 26 Feb 2009 11:35:55 +1100
Subject: This application has failed to start because the application
	configuration is incorrect
In-Reply-To: <d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
	<mailman.157.1234910674.11746.python-list@python.org>
	<d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>
Message-ID: <49A5E3EB.6090907@gmail.com>

On 26/02/2009 4:51 AM, Lorenzo wrote:

> PS: Mark, this could be added to a kind of "Deployment" entry in
> py2exe wiki, it would be useful.

IIRC, I've never edited the py2exe wiki (despite appearances to the 
contrary sometimes, I don't formally maintain that package!).

But that is the cool thing about Wiki's - *anyone* can add such 
information ;)

Cheers,

Mark


From xahlee at gmail.com  Wed Feb 25 19:46:52 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 25 Feb 2009 16:46:52 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com> 
	<15818a58-bcc6-4163-982f-d5534b087a6c@o36g2000yqh.googlegroups.com>
Message-ID: <ac261796-b664-42fe-ae4a-0d1a10fd31b0@j38g2000yqa.googlegroups.com>

On Feb 25, 10:18 am, Xah Lee <xah... at gmail.com> wrote:
> On Feb 25, 3:34 am, nick_keighley_nos... at hotmail.com wrote:
>
> > the nasty cons then only appears in a single function which
> > you can hide in a library
>
> I think the following answers that.
>
> Q: If you don't like cons, lisp has arrays and hashmaps, too.
>
> A: Suppose there's a lang called gisp. In gisp, there's cons but also
> fons. Fons are just like cons except it has 3 cells with 3 accessors:
> car, cbr, cdr. Now, gisp is a old lang, the fons are deeply rooted in
> the lang. Every some 100 lines of code you'll see a use of fons with
> its extra accessor cbr, or any one of the cbaar, cdabr, cbbar, cbbbar,
> etc. You got annoyed by this. You as a critic, complains that fons is
> bad. But then some gisp fanatics retorts: ?If you don't like fons,
> gisp has cons, too!?.
>
> You see, by ?having something too?, does not solve the problem of
> pollution. Sure, you can use just cons in gisp, but every lib or
> other's code you encounter, there's a invasion of fons with its cbar,
> cbbar, cbbbar. The problem created by fons does not go away by ?having
> cons too?.
>
> above is from
>
> ? Fundamental Problems of Lisp
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
>
> ---------
>
> > I read it. Your point seems to be "cons becomes difficult
> > with deeply nested structures". Could you give an example?
>
> There are few examples in these articles:
>
> ? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
> Nested Notations
>  http://xahlee.org/UnixResource_dir/writ/notations.html
>
> the above, 3rd section, gives detail about the problems of fully
> nested syntax. In particular, it shows a source code snippet of
> language with fully nested syntax, but is not lisp, so that lispers
> can get a fresh impression.
>
> ? A Ruby Illustration of Lisp Problems
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems_by_ruby.html
>
> the above, is a concrete example of showing how full nesting is
> cumbersome, by constrasting a simple program in Ruby and lisp.
>
> ? Why Lisp Do Not Have A Generic Copy-List Function
>  http://xahlee.org/UnixResource_dir/writ/lisp_equal_copy_list.html
>
> the above, shows the cons problem, by looking Kent Pitman's article
> with a different perspective.
>
> A short Plain Text Excerpt of the ruby article cited above follows.
> ------------------------------
>
> More specifically, 2 fundamental problems of lisp i feel this ruby
> example illustrates well:
>
> ? the cons impedes many aspects of lists. e.g. difficult to learn,
> confusing, hard to use, prevent development of coherent list
> manipulation functions.
>
> ? nested syntax impedes the functional programing paradigm of function
> chaining, esp when each function has 2 or more arguments (e.g. map).
>
> here's a short summary of the nesting problem:
>
> (map f x) ; 1 level of chaining
> (map g (map f x)) ; 2 levels
> (map h (map g (map f x))) ; 3 levels
>
> compare:
>
> x | f | g | h   ----> unix pipe
> x // f // g // h   ----> Mathematica
> h @ g @ f @ x    ----> Mathematica
> x.f.g.h        -------> various OOP langs, esp Ruby, javascript
> h g f x       -------> some functional langs, Haskell, Ocaml
>
> The way the above works is that each of f, g, h is a lambda themselves
> that maps. (that is, something like ?(lambda (y) (map f y))?)
>
> Note, that any of the f, g, h may be complex pure functions (aka
> lambda).  Because in lisp, each lambda itself will in general have
> quite a lot nested parens (which cannot be avoided), so this makes any
> chaining of functions of 2 args, for more than 2 or 3 levels of
> nesting, unusable for practical coding. One must define the functions
> separately and just call their names, or use function composition with
> lambda (which gets complex quickly). One major aspect of this problem
> is that the scope of vars becomes hard to understand in the deep
> nested source code. This is worse in elisp, because emacs is
> dynamically scoped, so you have to avoid using var of same name.


Here's a actual lisp code. I don't consider it readable, due to the
profusion of parens.

(defun lisp-complete-symbol (&optional predicate)
  "Perform completion on Lisp symbol preceding point.
Compare that symbol against the known Lisp symbols.
If no characters can be completed, display a list of possible
completions.
Repeating the command at that point scrolls the list.

When called from a program, optional arg PREDICATE is a predicate
determining which symbols are considered, e.g. `commandp'.
If PREDICATE is nil, the context determines which symbols are
considered.  If the symbol starts just after an open-parenthesis, only
symbols with function definitions are considered.  Otherwise, all
symbols with function definitions, values or properties are
considered."
  (interactive)
  (let ((window (get-buffer-window "*Completions*" 0)))
    (if (and (eq last-command this-command)
	     window (window-live-p window) (window-buffer window)
	     (buffer-name (window-buffer window)))
	;; If this command was repeated, and
	;; there's a fresh completion window with a live buffer,
	;; and this command is repeated, scroll that window.
	(with-current-buffer (window-buffer window)
	  (if (pos-visible-in-window-p (point-max) window)
	      (set-window-start window (point-min))
	    (save-selected-window
	      (select-window window)
	      (scroll-up))))

      ;; Do completion.
      (let* ((end (point))
	     (beg (with-syntax-table emacs-lisp-mode-syntax-table
		    (save-excursion
		      (backward-sexp 1)
		      (while (= (char-syntax (following-char)) ?\')
			(forward-char 1))
		      (point))))
	     (pattern (buffer-substring-no-properties beg end))
	     (predicate
	      (or predicate
		  (save-excursion
		    (goto-char beg)
		    (if (not (eq (char-before) ?\())
			(lambda (sym)	;why not just nil ?   -sm
			  (or (boundp sym) (fboundp sym)
			      (symbol-plist sym)))
		      ;; Looks like a funcall position.  Let's double check.
		      (if (condition-case nil
			      (progn (up-list -2) (forward-char 1)
				     (eq (char-after) ?\())
			    (error nil))
			  ;; If the first element of the parent list is an open
			  ;; parenthesis we are probably not in a funcall position.
			  ;; Maybe a `let' varlist or something.
			  nil
			;; Else, we assume that a function name is expected.
			'fboundp)))))
	     (completion (try-completion pattern obarray predicate)))
	(cond ((eq completion t))
	      ((null completion)
	       (message "Can't find completion for \"%s\"" pattern)
	       (ding))
	      ((not (string= pattern completion))
	       (delete-region beg end)
	       (insert completion)
	       ;; Don't leave around a completions buffer that's out of date.
	       (let ((win (get-buffer-window "*Completions*" 0)))
		 (if win (with-selected-window win (bury-buffer)))))
	      (t
	       (let ((minibuf-is-in-use
		      (eq (minibuffer-window) (selected-window))))
		 (unless minibuf-is-in-use
		   (message "Making completion list..."))
		 (let ((list (all-completions pattern obarray predicate)))
		   (setq list (sort list 'string<))
		   (or (eq predicate 'fboundp)
		       (let (new)
			 (while list
			   (setq new (cons (if (fboundp (intern (car list)))
					       (list (car list) " <f>")
					     (car list))
					   new))
			   (setq list (cdr list)))
			 (setq list (nreverse new))))
		   (if (> (length list) 1)
		       (with-output-to-temp-buffer "*Completions*"
			 (display-completion-list list pattern))
		     ;; Don't leave around a completions buffer that's
		     ;; out of date.
		     (let ((win (get-buffer-window "*Completions*" 0)))
		       (if win (with-selected-window win (bury-buffer))))))
		 (unless minibuf-is-in-use
		   (message "Making completion list...%s" "done")))))))))

  Xah
? http://xahlee.org/

?


From philip at semanchuk.com  Wed Feb 25 19:48:04 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 25 Feb 2009 19:48:04 -0500
Subject: PYTHONPATH on Mac 10.5
In-Reply-To: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
References: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
Message-ID: <C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>


On Feb 25, 2009, at 3:20 PM, Vincent Davis wrote:

> I have looked around for a good howto setup PYTHONPATH on Mac os x
> 10.5 Although I get many results I am not sure which is correct. I  
> am not
> sure if it is different for 10.5 over previous versions. Does anyone  
> know of
> a well documented set of instructions.
>
> Is there a way to specify a module location or working directory?  
> Which is
> best? Or should I just add location to PYTHONPATH?


Hi Vincent,
There are different instructions on how to set PYTHONPATH because it  
solves a problem (how to organize one's Python modules) that has more  
than one solution. It's sort of like asking "How should I organize my  
email?" Different strokes for different folks.

Me, I don't use PYTHONPATH at all. Most of the stuff I want to import  
is already available in site-packages. If not, I can add a .pth file  
to site-packages that tells Python where to find the source. You can  
read about .pth files here:
http://docs.python.org/library/site.html


> In my python scripts I specify which python I want to use like this
> #!/Library/Frameworks/Python.framework/Versions/4.1.30101/bin/python

Yikes! Your scripts won't be too portable then, will they? I'm on OS X  
10.5 and I don't have a directory like that. A common, more portable  
alternative is this:

#!/usr/bin/env python

That relies (obviously) on /usr/bin/env being present which means that  
your scripts won't work on Windows machines, for instance. But it's a  
whole lot more portable than what you've got now. You don't need a  
shebang line at all if you're willing to launch your scripts by typing  
`python foo.py` at the command line. That will merely execute  
whichever python appears first in your path. I used to always use the / 
usr/bin/env shebang line that I described above, but I do so less  
often now. It's one less dependency to deal with.

So, in short, PYTHONPATH doesn't need to be set at all, and you can  
switch the shebang line to this:

#!/usr/bin/env python

Or do away with it entirely.

This isn't a complete answer but has it been at least somewhat helpful?

Cheers
Philip








From rhodri at wildebst.demon.co.uk  Wed Feb 25 20:11:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 26 Feb 2009 01:11:49 -0000
Subject: pep 8 constants
In-Reply-To: <49a505cf$0$3567$426a74cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7578.1232421082.3487.python-list@python.org>
	<pan.2009.01.20.04.03.05@REMOVE.THIS.cybersource.com.au>
	<87fxje4lqh.fsf@benfinney.id.au>
	<49a505cf$0$3567$426a74cc@news.free.fr>
Message-ID: <op.upxplz17a8ncjz@gnudebst>

On Wed, 25 Feb 2009 08:48:27 -0000, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> wrote:

> Ben Finney a ?crit :
> (snip - about using ALL_CAPS for pseudo-constants)
>> Perhaps I'd even
>> argue for an update to PEP 8 that endorses this as conventional.
>
> +1
>
> I've been a bit surprised last time I checked PEP8 to find out this  
> wasn't already the case - I would have sweared it was.

It is.  Aahz added it a few weeks ago.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 20:18:00 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 23:18:00 -0200
Subject: variables bound in moudules are None when module is not
	completely imported
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
	<op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
	<20090225232433.GD28923@hephaistos.amsuess.com>
Message-ID: <op.upxpwausx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 21:24:33 -0200, <chrysn at fsfe.org> escribi?:
> On Wed, Feb 25, 2009 at 05:05:28PM -0200, Gabriel Genellina wrote:

>> I'd try to move all the global stuff in that module into a function,
>> "init". Importing the module will always succeed - you have to manually
>> call init() after importing it.
>
> i normally do that anyway and would also have done so here (afaik, it's
> best practice anyway), but this is in this case not possible as the
> modules in question are not under my control at all. as pep 299 has been
> turned down, this can't really be considered a bug of those files.

You might ask the module author for this feature... At least, try to move  
the "registration" at the end, after any code likely to raise exceptions.

> anyway, it would just be another workaround around the globals
> disappearing.
>
>> That makes a strange situation where the module doesn't exist in
>> sys.modules but its globals are still alive...
>
> is this a known bug?

Not that I know.

> i mean from a garbage collection / refcount point
> of view, at least everything that is still referenced somewhere should
> be preserved.

In older Python versions, an error when importing a module could leave a  
module object in sys.module partially initialized. That's very bad! Now,  
the entry in sys.modules is removed in such cases. Note that functions and  
classes defined inside a module don't have a reference to the module  
itself - their __module__ attribute is a string (although functions *do*  
have a reference to the module namespace, as you have remarked). So the  
entry in sys.modules is likely to be the last and only reference, and when  
it's removed, the module is deleted. This is a very tricky operation and  
at some stage involves setting all globals to None; if not were for any  
external references (like a callback registered somewhere else, as in your  
case) the module plus the functions and classes and objects defined inside  
it plus its global namespace, all of these should disappear, kaput, gone.

You should report it at http://bugs.python.org -- I don't think this is  
likely to be "fixed" now, but at least it's on record. And when someone  
attempts to improve the module destruction sequence, there is a better  
chance this is taken into account too.

-- 
Gabriel Genellina



From zvezdan at zope.com  Wed Feb 25 20:44:50 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Wed, 25 Feb 2009 20:44:50 -0500
Subject: Python Image Library IOError - cannot find JPEG decoder?
In-Reply-To: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
References: <mailman.674.1235496906.11746.python-list@python.org>
	<179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
Message-ID: <BD7D9967-60D2-481D-859C-07A983C0C2FE@zope.com>

> On Feb 24, 9:34 am, Dario Traverso <traver... at gmail.com> wrote:
>> I've been trying to install the Python Image Library  (PIL) on my Mac
>> OSX Leopard laptop, but have been running into some difficulties.
>> ...
>> I've followed all of the installation instructions exactly. The build
>> summary reported everything was "ok". What could be the problem here.
>> Libjpeg-6b  is not accessible?
>> That would be my guess.


It could be something obvious and something you have done, but it's  
worth asking:

1. Do you have the path to fink binaries, such as djpeg,
    in your shell PATH (e.g., /opt/local/bin for MacPorts)?

2. Did you set up the path to the libraries you linked with in the
    environment variable DYLD_LIBRARY_PATH?
    For example, DYLD_LIBRARY_PATH=/opt/local/lib for MacPorts

3. Did you execute your app with this variable available.

    $ env DYLD_LIBRARY_PATH=/opt/local/lib your-app

    Once you confirm what is missing you can write a Python wrapper
    to call your app with the right environment.



From zvezdan at zope.com  Wed Feb 25 21:11:13 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Wed, 25 Feb 2009 21:11:13 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <BB0AC5F4-67F5-4ADE-9B2E-42EFD80913E7@zope.com>

On Feb 25, 2009, at 3:54 PM, Shawn Milochik wrote:
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.

Well, they are trying to help you with the best practices.
You offered the code for review and they reviewed it.
Whether you'll accept what they say or deny it is your call, of course.

FWIW, the Pythonic way would be:

 >>> class Ship(object):
...     def __init__(self, length):
...         self._length = length
...     @property
...     def length(self):
...         return self._length
...
 >>> s = Ship(5)
 >>> s.length
5
 >>> # notice how the property is read-only which is what you wanted
 >>> s.length = 7
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
 >>> ^D

Using @property decorator makes a read-only property.  If you need a  
read/write property there are several ways to define setter and  
deleter methods with or without decorators.

I hope you see that

	x = s.length
	s.position = y

is a completely different style than

	x = s.get_length()
	s.set_position(y)

Most of the people who program in Python prefer the first style above.



From newptcai at gmail.com  Wed Feb 25 21:14:40 2009
From: newptcai at gmail.com (=?GB2312?B?0rvK18qr?=)
Date: Wed, 25 Feb 2009 18:14:40 -0800 (PST)
Subject: Is this the right way to use unicode in a user defined Exception?
Message-ID: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>

#------------------------------------------------
class MyError(Exception):
    def __init__(self):
        self.message = u'Some Chinese:??'

    def __str__(self):
        return self.message.encode('utf8')
#------------------------------------------------

This is an exception that I defined.   I have to pass it to third
party libraries.

As many libraries simply use str(e) to log, if I don't encode it in
__str___, they will fail.

But I am not quite certain if it's the right thing to do.   Shouldn't
every library expect to use unicode everywhere?

Shouldn't they use something like :

log(unicode(e))


From david.birdsong at gmail.com  Wed Feb 25 21:39:30 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 25 Feb 2009 18:39:30 -0800 (PST)
Subject: thread safe to lock on key,val pairs on a dict instead of entire 
	dict?
Message-ID: <bc40b182-4f9f-4e5e-964c-16042f2179aa@o11g2000yql.googlegroups.com>

Dictionaries just store references to objects, right?  So is it thread
safe to lock a specific key/val pair on a dictionary and modify its
val and release the lock?

example snippet:
# assuming d_lock  was initialized long ago in a thread-safe manner
d_lock.acquire()
d = {}
d[1] = (threading.Lock(), [])
d_lock.release()

# test key level locking
for key, data in d.items():
  row_lock, rows = data
  row_lock.acquire()
  rows.append(1)
  row_lock.release()

Of course, I'll have to lock the entire dict when adding keys that
dont exist, but further calls and acquire the key specific lock before
doing any write operations.


From mmcclaf at gmail.com  Wed Feb 25 22:31:00 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Wed, 25 Feb 2009 19:31:00 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
	<mailman.9003.1233950946.3487.python-list@python.org>
	<60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
	<mailman.9011.1233957852.3487.python-list@python.org>
Message-ID: <1f34f542-8042-42a1-b2cf-95aa00256466@l39g2000yqn.googlegroups.com>

Thanks! All fixed!


From music24by7 at gmail.com  Wed Feb 25 22:37:38 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 19:37:38 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
Message-ID: <abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>

On Feb 26, 2:35?am, Emile van Sebille <em... at fenx.com> wrote:
> Peter Otten wrote:
> > Maybe it's about access rights?
>
> > $ mkdir alpha
> > $ touch alpha/beta
> > $ python -c"import os; print os.path.exists('alpha/beta')"
> > True
> > $ chmod u-x alpha
> > $ python -c"import os; print os.path.exists('alpha/beta')"
> > False
> > $
>
> > I Don't know how this is handled on Windows...
>
> Here's one way....
>
> Microsoft Windows XP [Version 5.1.2600]
> (C) Copyright 1985-2001 Microsoft Corp.
> C:\>mkdir alpha
> C:\>touch alpha\beta ?# cygwin at work here...
>
> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> True
>
> C:\>cacls alpha /E /R "Everyone"
> processed dir: C:\alpha
> C:\>cacls alpha /E /R "Users"
> processed dir: C:\alpha
> C:\>cacls alpha /E /R "Administrators"
> processed dir: C:\alpha
>
> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> False

Hi,

This is the following code which i have used to retrieve the pathname
of a filename given by the user

        filename = self.enText.get() # get the text entered in the
text box
        if os.path.exists(filename): # checking if the filename
exists , had replaced it with os.path.exists(os.path.abspath
(filename))
            print os.path.abspath(filename)
        else:
            print "Not found"

actually i need to list all the files/folders with the given filename
alongwith path and store it in an CSV file with index.

But i am unable to get even a single filepath correctly.
Whatever filename i enter the output is as : C:\Python25\WorkSpace
\xyz
i.e the name i entered is being appended to my workspace and
displayed.
Guys, i am not able to understand what shall i do here...plz help me
out.


Regards,
Sudhir


From steve at holdenweb.com  Wed Feb 25 23:03:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 23:03:09 -0500
Subject: File Path retrieving problem
In-Reply-To: <abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>	<go3ugf$ol7$03$1@news.t-online.com>
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
Message-ID: <go54ah$o41$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
>> Peter Otten wrote:
>>> Maybe it's about access rights?
>>> $ mkdir alpha
>>> $ touch alpha/beta
>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>> True
>>> $ chmod u-x alpha
>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>> False
>>> $
>>> I Don't know how this is handled on Windows...
>> Here's one way....
>>
>> Microsoft Windows XP [Version 5.1.2600]
>> (C) Copyright 1985-2001 Microsoft Corp.
>> C:\>mkdir alpha
>> C:\>touch alpha\beta  # cygwin at work here...
>>
>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>> True
>>
>> C:\>cacls alpha /E /R "Everyone"
>> processed dir: C:\alpha
>> C:\>cacls alpha /E /R "Users"
>> processed dir: C:\alpha
>> C:\>cacls alpha /E /R "Administrators"
>> processed dir: C:\alpha
>>
>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>> False
> 
> Hi,
> 
> This is the following code which i have used to retrieve the pathname
> of a filename given by the user
> 
>         filename = self.enText.get() # get the text entered in the
> text box
>         if os.path.exists(filename): # checking if the filename
> exists , had replaced it with os.path.exists(os.path.abspath
> (filename))
>             print os.path.abspath(filename)
>         else:
>             print "Not found"
> 
> actually i need to list all the files/folders with the given filename
> alongwith path and store it in an CSV file with index.
> 
> But i am unable to get even a single filepath correctly.
> Whatever filename i enter the output is as : C:\Python25\WorkSpace
> \xyz
> i.e the name i entered is being appended to my workspace and
> displayed.
> Guys, i am not able to understand what shall i do here...plz help me
> out.
> 
Look, we aren't psychic. We can't debug code and directories we can't
see. Work with us here - give us the information we need to help you.

The actual code. A directory listing? Any error messages?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mmcclaf at gmail.com  Wed Feb 25 23:04:36 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Wed, 25 Feb 2009 20:04:36 -0800 (PST)
Subject: Queries
Message-ID: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>

I have to make  some queries for 4 tables I have. The following
relations are:

Classes(class, type, country, numGuns, bore, displacement)
Ships (name, class, launched)
Battles (name, date)
Outcomes (ship, battle, result)

The three queries I'm stuck on are the following:

1. Find the classes that have only one ship as a member of that class
(not all ships are listed in the Ship table)
2. Find the countries that had both battleships and battlecruisers
(those fall under type in Classes)
3. Find those ships that "lived to fight another day"; they were
damaged in one battle, but later fought in another.

The best way for me to understand would be relational algebra for each
of the statements.

Any help in this would be greatly appreciated.


From music24by7 at gmail.com  Wed Feb 25 23:16:39 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 20:16:39 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
	<mailman.785.1235621020.11746.python-list@python.org>
Message-ID: <69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>

On Feb 26, 9:03?am, Steve Holden <st... at holdenweb.com> wrote:
> music24... at gmail.com wrote:
> > On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
> >> Peter Otten wrote:
> >>> Maybe it's about access rights?
> >>> $ mkdir alpha
> >>> $ touch alpha/beta
> >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> >>> True
> >>> $ chmod u-x alpha
> >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> >>> False
> >>> $
> >>> I Don't know how this is handled on Windows...
> >> Here's one way....
>
> >> Microsoft Windows XP [Version 5.1.2600]
> >> (C) Copyright 1985-2001 Microsoft Corp.
> >> C:\>mkdir alpha
> >> C:\>touch alpha\beta ?# cygwin at work here...
>
> >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> >> True
>
> >> C:\>cacls alpha /E /R "Everyone"
> >> processed dir: C:\alpha
> >> C:\>cacls alpha /E /R "Users"
> >> processed dir: C:\alpha
> >> C:\>cacls alpha /E /R "Administrators"
> >> processed dir: C:\alpha
>
> >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> >> False
>
> > Hi,
>
> > This is the following code which i have used to retrieve the pathname
> > of a filename given by the user
>
> > ? ? ? ? filename = self.enText.get() # get the text entered in the
> > text box
> > ? ? ? ? if os.path.exists(filename): # checking if the filename
> > exists , had replaced it with os.path.exists(os.path.abspath
> > (filename))
> > ? ? ? ? ? ? print os.path.abspath(filename)
> > ? ? ? ? else:
> > ? ? ? ? ? ? print "Not found"
>
> > actually i need to list all the files/folders with the given filename
> > alongwith path and store it in an CSV file with index.
>
> > But i am unable to get even a single filepath correctly.
> > Whatever filename i enter the output is as : C:\Python25\WorkSpace
> > \xyz
> > i.e the name i entered is being appended to my workspace and
> > displayed.
> > Guys, i am not able to understand what shall i do here...plz help me
> > out.
>
> Look, we aren't psychic. We can't debug code and directories we can't
> see. Work with us here - give us the information we need to help you.
>
> The actual code. A directory listing? Any error messages?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/





Hi Steve,

Following is the code which i have written to display a GUI textbox
and get any name entered by the user and search the path of this
filename and then list it into an CSV file.

For this i initially created an textbox widget and added an button to
it.
Now, i have entered a filename (like NEWS.txt) in the text boz,
as you can see when i press the button i retrieve the text and then
search its filepath.
currently i am printing this filepath on the shell.


from Tkinter import *
import os
from os.path import realpath, exists, abspath
import tkMessageBox
import Tkinter
#import filePath

class GUIFrameWork(Frame):
    """This is the GUI"""

    def __init__(self,master=None):
        """Initialize yourself"""

        """Initialise the base class"""
        Frame.__init__(self,master)

        """Set the Window Title"""
        self.master.title("Enter Text to search")

        """Display the main window"
        with a little bit of padding"""
        self.grid(padx=10,pady=10)
        self.CreateWidgets()

    def CreateWidgets(self):

        self.enText = Entry(self)
        self.enText.grid(row=0, column=1, columnspan=3)



        """Create the Button, set the text and the
        command that will be called when the button is clicked"""
        self.btnDisplay = Button(self, text="Display!",
command=self.Display)
        self.btnDisplay.grid(row=0, column=4)

    def Display(self):
        """Called when btnDisplay is clicked, displays the contents of
self.enText"""
        filename = self.enText.get()
        if os.path.exists(os.path.abspath(filename)):
            print os.path.abspath(filename)
        else:
            print "Not found"
        #tkMessageBox.showinfo("Text", "You typed: %s" %
os.path.abspath(os.path.dirname(filename)))

        #filepath.mydir(self.enText.get())


if __name__ == "__main__":
    guiFrame = GUIFrameWork()
    guiFrame.mainloop()





User Input: NEWS.txt
Output: Not Found (though this file is actually present)




Regards,
Sudhir


From sjmachin at lexicon.net  Thu Feb 26 00:11:56 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 25 Feb 2009 21:11:56 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
	<mailman.785.1235621020.11746.python-list@python.org>
	<69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
Message-ID: <c3b627e7-cd2b-4439-941f-b2814d4163d0@x13g2000yqf.googlegroups.com>

On Feb 26, 3:16?pm, music24... at gmail.com wrote:
> On Feb 26, 9:03?am, Steve Holden <st... at holdenweb.com> wrote:
>
>
>
> > music24... at gmail.com wrote:
> > > On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
> > >> Peter Otten wrote:
> > >>> Maybe it's about access rights?
> > >>> $ mkdir alpha
> > >>> $ touch alpha/beta
> > >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> > >>> True
> > >>> $ chmod u-x alpha
> > >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> > >>> False
> > >>> $
> > >>> I Don't know how this is handled on Windows...
> > >> Here's one way....
>
> > >> Microsoft Windows XP [Version 5.1.2600]
> > >> (C) Copyright 1985-2001 Microsoft Corp.
> > >> C:\>mkdir alpha
> > >> C:\>touch alpha\beta ?# cygwin at work here...
>
> > >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> > >> True
>
> > >> C:\>cacls alpha /E /R "Everyone"
> > >> processed dir: C:\alpha
> > >> C:\>cacls alpha /E /R "Users"
> > >> processed dir: C:\alpha
> > >> C:\>cacls alpha /E /R "Administrators"
> > >> processed dir: C:\alpha
>
> > >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> > >> False
>
> > > Hi,
>
> > > This is the following code which i have used to retrieve the pathname
> > > of a filename given by the user
>
> > > ? ? ? ? filename = self.enText.get() # get the text entered in the
> > > text box
> > > ? ? ? ? if os.path.exists(filename): # checking if the filename
> > > exists , had replaced it with os.path.exists(os.path.abspath
> > > (filename))
> > > ? ? ? ? ? ? print os.path.abspath(filename)
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? print "Not found"
>
> > > actually i need to list all the files/folders with the given filename
> > > alongwith path and store it in an CSV file with index.
>
> > > But i am unable to get even a single filepath correctly.
> > > Whatever filename i enter the output is as : C:\Python25\WorkSpace
> > > \xyz
> > > i.e the name i entered is being appended to my workspace and
> > > displayed.
> > > Guys, i am not able to understand what shall i do here...plz help me
> > > out.
>
> > Look, we aren't psychic. We can't debug code and directories we can't
> > see. Work with us here - give us the information we need to help you.
>
> > The actual code. A directory listing? Any error messages?
>
> > regards
> > ?Steve
> > --
> > Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> > Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/
>
> Hi Steve,
>
> Following is the code which i have written to display a GUI textbox
> and get any name entered by the user and search the path of this
> filename and then list it into an CSV file.
>
> For this i initially created an textbox widget and added an button to
> it.
> Now, i have entered a filename (like NEWS.txt) in the text boz,
> as you can see when i press the button i retrieve the text and then
> search its filepath.
> currently i am printing this filepath on the shell.
>
> from Tkinter import *
> import os
> from os.path import realpath, exists, abspath
> import tkMessageBox
> import Tkinter
> #import filePath
>
> class GUIFrameWork(Frame):
> ? ? """This is the GUI"""
>
> ? ? def __init__(self,master=None):
> ? ? ? ? """Initialize yourself"""
>
> ? ? ? ? """Initialise the base class"""
> ? ? ? ? Frame.__init__(self,master)
>
> ? ? ? ? """Set the Window Title"""
> ? ? ? ? self.master.title("Enter Text to search")
>
> ? ? ? ? """Display the main window"
> ? ? ? ? with a little bit of padding"""
> ? ? ? ? self.grid(padx=10,pady=10)
> ? ? ? ? self.CreateWidgets()
>
> ? ? def CreateWidgets(self):
>
> ? ? ? ? self.enText = Entry(self)
> ? ? ? ? self.enText.grid(row=0, column=1, columnspan=3)
>
> ? ? ? ? """Create the Button, set the text and the
> ? ? ? ? command that will be called when the button is clicked"""
> ? ? ? ? self.btnDisplay = Button(self, text="Display!",
> command=self.Display)
> ? ? ? ? self.btnDisplay.grid(row=0, column=4)
>
> ? ? def Display(self):
> ? ? ? ? """Called when btnDisplay is clicked, displays the contents of
> self.enText"""
> ? ? ? ? filename = self.enText.get()

Add some more code in here:
   print "filename", repr(filename)
   cwd = os.getcwd()
   print "cwd", cwd
   abspath = os.path.abspath(filename)
   print "abspath", repr(abspath)
   exists = os.path.exists(abspath)
   print "exists", exists
and copy/paste the output into your reply.
Also tell us the name of the folder that the file allegedly exists in,
with a folder listing to prove it.
Also show us the result of using the ATTRIB command on your file, like
in the following examples:

C:\junk>attrib c:\io.sys
   SHR     C:\IO.SYS

C:\junk>attrib c:\python26\python.exe
A          C:\python26\python.exe

Again, use copy/paste in your reply.


> ? ? ? ? if os.path.exists(os.path.abspath(filename)):
> ? ? ? ? ? ? print os.path.abspath(filename)
> ? ? ? ? else:
> ? ? ? ? ? ? print "Not found"
> ? ? ? ? #tkMessageBox.showinfo("Text", "You typed: %s" %
> os.path.abspath(os.path.dirname(filename)))
>
> ? ? ? ? #filepath.mydir(self.enText.get())
>
> if __name__ == "__main__":
> ? ? guiFrame = GUIFrameWork()
> ? ? guiFrame.mainloop()
>
> User Input: NEWS.txt
> Output: Not Found (though this file is actually present)



From hrishys at yahoo.co.uk  Thu Feb 26 00:36:04 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Thu, 26 Feb 2009 05:36:04 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>
Message-ID: <206436.56338.qm@web27404.mail.ukl.yahoo.com>

Ha the guru himself responding :-)


--- On Wed, 25/2/09, Paul McGuire <ptmcg at austin.rr.com> wrote:

> From: Paul McGuire <ptmcg at austin.rr.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 2:04 PM
> On Feb 25, 1:17?am, hrishy <hris... at yahoo.co.uk>
> wrote:
> > Hi
> >
> > Something like this
> >
> <snip solution using ElementTree>
> >
> > Note i am not a python programmer just a enthusiast
> and i was curious why people on the list didnt suggest a
> code like above
> >
> 
> You just beat the rest of us to it - good example of
> ElementTree for
> parsing XML (and I Iearned the '//' shortcut for
> one or more
> intervening tag levels).
> 
> To the OP: if you are parsing XML, I would look hard at the
> modules
> (esp. ElementTree) that are written explicitly for XML,
> before
> considering using regular expressions.  There are just too
> many
> potential surprises when trying to match XML tags -
> presence/absence/
> order of attributes, namespaces, whitespace inside tags, to
> name a
> few.
> 
> -- Paul
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From hrishys at yahoo.co.uk  Thu Feb 26 00:39:39 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Thu, 26 Feb 2009 05:39:39 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <1235565442.6046.2.camel@mctell>
Message-ID: <486443.55132.qm@web27405.mail.ukl.yahoo.com>

Hi Cliff

Thanks so using elementree is the right way to handle this problem

regards
Hrishy


--- On Wed, 25/2/09, J. Clifford Dyer <jcd at sdf.lonestar.org> wrote:

> From: J. Clifford Dyer <jcd at sdf.lonestar.org>
> Subject: Re: XML Parsing
> To: hrishys at yahoo.co.uk
> Cc: python-list at python.org, "Lie Ryan" <lie.1296 at gmail.com>
> Date: Wednesday, 25 February, 2009, 12:37 PM
> Probably because you responded an hour after the question
> was posted,
> and in the dead of night.  Newsgroups often move slower
> than that.  But
> now we have posted a solution like that, so all's well
> in the world.  :)
> 
> Cheers,
> Cliff
> 
> 
> On Wed, 2009-02-25 at 08:20 +0000, hrishy wrote:
> > Hi Lie
> > 
> > I am not a python guy but very interested in the
> langauge and i consider the people on this list to be
> intelligent and was wundering why you people did not suggest
> xpath for this kind of a problem just curious and willing to
> learn.
> > 
> > I am searching for a answer but the question is 
> > why not use xpath to extract xml text from a xml doc ?
> > 
> > regards
> > Hrishy
> > 
> > 
> > --- On Wed, 25/2/09, Lie Ryan
> <lie.1296 at gmail.com> wrote:
> > 
> > > From: Lie Ryan <lie.1296 at gmail.com>
> > > Subject: Re: XML Parsing
> > > To: python-list at python.org
> > > Date: Wednesday, 25 February, 2009, 7:33 AM
> > > Are you searching for answer or searching for
> another people
> > > that have 
> > > the same answer as you? :)
> > > 
> > > "Many roads lead to Rome" is a very
> famous
> > > quotation...
> > > 
> > > --
> > >
> http://mail.python.org/mailman/listinfo/python-list
> > 
> > 
> >       
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >


      


From gherron at islandtraining.com  Thu Feb 26 01:45:36 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 25 Feb 2009 22:45:36 -0800
Subject: Queries
In-Reply-To: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
Message-ID: <49A63A90.4080003@islandtraining.com>

mmcclaf wrote:
> I have to make  some queries for 4 tables I have. The following
> relations are:
>
> Classes(class, type, country, numGuns, bore, displacement)
> Ships (name, class, launched)
> Battles (name, date)
> Outcomes (ship, battle, result)
>
> The three queries I'm stuck on are the following:
>
> 1. Find the classes that have only one ship as a member of that class
> (not all ships are listed in the Ship table)
> 2. Find the countries that had both battleships and battlecruisers
> (those fall under type in Classes)
> 3. Find those ships that "lived to fight another day"; they were
> damaged in one battle, but later fought in another.
>
> The best way for me to understand would be relational algebra for each
> of the statements.
>   


Sounds like a homework assignment.    Good luck with it.


> Any help in this would be greatly appreciated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From pythonnutter at gmail.com  Thu Feb 26 02:09:05 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 26 Feb 2009 18:09:05 +1100
Subject: PYTHONPATH on Mac 10.5
In-Reply-To: <C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>
References: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
	<C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>
Message-ID: <af90b3410902252309v52c62fb4x24249e43544e2208@mail.gmail.com>

+1 for site packages and standard shebang, still lets you launch with
python first followed by .py file or <big long path to a specific
python> followed by .py file

also for some clues, just open up a terminal in your Mac OS X computer
and check out your exports your PATH will be different depending on
all the software and development environments you may or may not be
using on your Mac, in particular:

declare -x PATH="/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin"

declare -x PYTHONSTARTUP="/Users/pythonnutter/.pythonstartup"

for the ultra curious, my custom python startup:

$cat .pythonstartup
# python startup file
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind('tab: complete')
# history file
histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass
atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter



On Windows you don't have much control in standard batch files but the
way I keep my Windows box (at work mind you, none at home)
multi-python'd

is I configure the environment for Framework 2.5.4, and all the path
environment variables are configured for the standard directory and
the scripts subdirectory.

in 25's scripts is go26.bat which just pre-pends the 2.6.1 path on the
head of PATH, and of course a go3.bat that pre-pends in 3.0.1

if you want to get fancy, since there is no pop in batch files that I
know of, you could drop a .py script in to read in PATH, pop off two
entries and modify the environment PATH so you fall back down the tree
(might need some list reversing in there to finish the massaging for
pops)

most times I get by with just exiting the terminal session in windows
and a new cmd session will once again take on the defaults for 2.5.4


From qq13234722 at gmail.com  Thu Feb 26 02:38:36 2009
From: qq13234722 at gmail.com (qq13234722 at gmail.com)
Date: Wed, 25 Feb 2009 23:38:36 -0800 (PST)
Subject: The Python's regex different from Perl's ,I want know what's the 
	different?
Message-ID: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>

The Python's regex different from Perl's ,I want know what's the
different?


From dan.barbus at gmail.com  Thu Feb 26 02:46:01 2009
From: dan.barbus at gmail.com (Dan Barbus)
Date: Wed, 25 Feb 2009 23:46:01 -0800 (PST)
Subject: class property not working in python 2.5.1
Message-ID: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>

Hi,

I have a problem with setting a property to a class instance, in
python 2.5.1. The property is defined through get and set methods, but
when I set it, the setter doesn't get called. Instead, I believe the
property in the instance gets replaced with a new object (string).

I have the following code (stripped down from my program):

class Model():
    def __init__(self, title = ''):
        self._views, self._title = [], None
        self.setTitle(title)

    def addView(self, view):
        self._views.append(view)
        view.onModelUpdated()

    def updateViews(self, trigger = None):
        for view in self._views:
            view.onModelUpdated(trigger)

    def getTitle(self):
        return self._title
    def setTitle(self, t):
        #if self.debug:
        if self._title != t:
            self._title = t
            self.updateViews()
    title = property(fget=getTitle, fset=setTitle)

# client code:

class CountUpdatesView():
    def __init__(self):
        self.updates = 0

    def onModelUpdated(self, trigger):
        self.updates += 1


m = Model('test')
v = CountUpdatesView()
m.addView(v)           # addView calls into v.onModelUpdated() and
                              # v.updates will be 1 after this
m.title = 'new title'    # Model.setTitle calls into v.onModelUpdated
()
                              # and v.updates should become 2
print m._title            # should print 'new title'; instead, prints
'test'

When assigning to m.title, v.updates is not changed, and the last line
prints the original value, passed to the constructor.
Am I missing something?

I noticed that if I put m.setTitle('new title') in the client code,
the code works correctly.


From lists at cheimes.de  Thu Feb 26 02:56:30 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 26 Feb 2009 08:56:30 +0100
Subject: class property not working in python 2.5.1
In-Reply-To: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
References: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
Message-ID: <go5hve$lc6$1@ger.gmane.org>

Dan Barbus schrieb:
> Hi,
> 
> I have a problem with setting a property to a class instance, in
> python 2.5.1. The property is defined through get and set methods, but
> when I set it, the setter doesn't get called. Instead, I believe the
> property in the instance gets replaced with a new object (string).
> 
> I have the following code (stripped down from my program):
> 
> class Model():
>     def __init__(self, title = ''):
>         self._views, self._title = [], None
>         self.setTitle(title)

*snip*

Properties don't work correctly on old style classes. You have to
subclass from object in order to get a new style class.

class Model(object):
    pass

Christian



From tjreedy at udel.edu  Thu Feb 26 03:12:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 03:12:02 -0500
Subject: Is this the right way to use unicode in a user defined Exception?
In-Reply-To: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>
References: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>
Message-ID: <go5isd$mss$1@ger.gmane.org>

??? wrote:
> #------------------------------------------------
> class MyError(Exception):
>     def __init__(self):
>         self.message = u'Some Chinese:??'
> 
>     def __str__(self):
>         return self.message.encode('utf8')
> #------------------------------------------------
> 
> This is an exception that I defined.   I have to pass it to third
> party libraries.
> 
> As many libraries simply use str(e) to log, if I don't encode it in
> __str___, they will fail.
> 
> But I am not quite certain if it's the right thing to do.   Shouldn't
> every library expect to use unicode everywhere?
> 
> Shouldn't they use something like :
> 
> log(unicode(e))

In 3.0, text is unicode.  So libraries will mostly expect it.



From chelaskk at gmail.com  Thu Feb 26 04:05:06 2009
From: chelaskk at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 12:05:06 +0300
Subject: i have problem with glob.glob() in remotely directory
Message-ID: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>

hey i want to count number of files in remote computer

example of my code is

import glob
import os
import time
from datetime import date
today=date.today()
dir_count, file_count=0, 0

for files in glob.glob('\\192.168.0.45\files\*.txt'):
      file_count += len(files)
print '----the count of ',today, '-------'
print 'Found', dir_count, 'sub-directories in cwd'
print 'Found', file_count, 'files in cwd'
print 'Found', dir_count + file_count, 'files & sub-directories in cwd'
filename="reconciliation.txt"
file_string= str(file_count)+','+ str(today)+'\n'
File=open(filename,"a")
File.writelines( file_string)
File.close()



i get zero results since glob.glob( )can not traverse in \\192.168.0.45

can I get help please how can i do that???


From python at rcn.com  Thu Feb 26 04:12:24 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 01:12:24 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
Message-ID: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>

Here's a proposed implementation for Py2.7 and Py3.1:

    http://code.activestate.com/recipes/576669/

Would like you guys to kick the tires, exercise it a bit, and let me
know what you think.  The recipe runs under 2.6 and 3.0 without
modification so it should be easy to play with.

The main virtue of the proposed API is a near-zero learning curve.
The API is a same as for regular dictionaries but it remembers the
insertion order and used that for iteration, repr, etc.


Raymond



From clp2 at rebertia.com  Thu Feb 26 04:16:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 01:16:16 -0800
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
Message-ID: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>

On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
> hey i want to count number of files in remote computer
>
> example of my code is
>
> import glob
> import os
> import time
> from datetime import date
> today=date.today()
> dir_count, file_count=0, 0
>
> for files in glob.glob('\\192.168.0.45\files\*.txt'):

Remember that *backslash is the escape character* in Python, so you
need to double-up your backslashes in the string literal (or just use
forward slashes instead, Windows doesn't seem to care for Python in
most cases). Right now, the path really only starts with 1 backslash
and it has a formfeed character in it (\f), so it's obviously invalid;
thus, your problem.

So you want:
#looks ugly, doesn't it?
for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):

Or:
#will probably but not assuredly work
for files in glob.glob('//192.168.0.45/files/*.txt'):

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From music24by7 at gmail.com  Thu Feb 26 04:20:17 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Thu, 26 Feb 2009 01:20:17 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
Message-ID: <f611da56-b923-4e1e-9460-3142b99b2175@v39g2000yqm.googlegroups.com>

Hi Dennis Thanks for your reply and also the detailed explanation.

>         Or do you mean you want something that, given a bare name, searches
> your file system to find where a file with that name actually is?
>

Yes, this is what i exactly needed.
I have found something interesting to do this using the os.walk(path)
function, and it worked....
I am pasting the code which i used for this:



testpath=r"C:\\"
logpath=r"C:\Pathfinder.txt"
csvpath=r"C:\Pathfinder.csv"
import os, csv

def logData(d={}, logfile="c://filename999.txt", separator="\n"):
    """Takes a dictionary of values and writes them to the provided
file path"""
    logstring=separator.join([str(key)+":  "+d[key] for key in
d.keys()])+"\n"
    f=open(logfile,'a')
    f.write(logstring)
    f.close()
    return
def walker(topPath,csvpath):
    fDict={}
    logDict={}
    limit=1000
    freed_space=0
    items=0
    fileHandle = csv.writer(open(csvpath, 'w'))
    fileHandle.writerow(['Index','Path'])
    for root, dirs, files in os.walk(topPath):
        for name in files:
            fpath=os.path.join(root,name)
            logDict["Name"]=name
            logDict["Path"]=fpath
            if name.find("NEWS"):
                continue
            else:
            logData(logDict, logpath, "\t")
            fDict[items] = name
            items=len(fDict.keys())
            fileHandle.writerow([items,fpath])
            print "Dict entry:  ",items,
            print "Path:  ",fpath
            if items > limit:
                break
        if items > limit:
                break
walker(testpath,csvpath)



Finally thank you all very much for the patience to listen to me.


Regards,
Sudhir



From dmitrey.kroshko at scipy.org  Thu Feb 26 04:39:48 2009
From: dmitrey.kroshko at scipy.org (dmitrey)
Date: Thu, 26 Feb 2009 01:39:48 -0800 (PST)
Subject: [numerical optimization] Poll "what do you miss in OpenOpt framework"
Message-ID: <1555c112-7c91-47a5-8104-315553f83b26@o11g2000yql.googlegroups.com>

Hi all,
I created a poll "what do you miss in OpenOpt framework", could you
take participation?

http://www.doodle.com/participation.html?pollId=a78g5mk9sf7dnrbe

Let me remember for those ones who is not familiar with OpenOpt - it's
a free Python-written numerical optimization framework:

http://openopt.org

I intend to take you opinions into account till next OpenOpt release
0.23 (2009-03-15)

Thank you in advance,
Dmitrey


From xahlee at gmail.com  Thu Feb 26 04:42:02 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 01:42:02 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com>
Message-ID: <002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com>

On Feb 26, 12:57 am, Miles Bader <mi... at gnu.org> wrote:
> There is ample room for people to discuss this evolution, but approaches
> that start with "first, toss out the existing user interface" aren't gonna fly.

Who said to toss out existing user interface, you?

Are you saying that i start my suggestion with ?throw out existing
UI?? If so, please point out where.

> Emacs isn't going to turn into a fancy notepad clone, regardless of what
> "modern" users may (think they) want...

In what way you imagine emacs is going to be a fancy Microsoft Notepad
clone?

I've wrote the following suggestions on emacs modernization in the
past 3 years:

? The Modernization of Emacs
  http://xahlee.org/emacs/modernization.html

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

? Emacs's M-?key? Notation vs Alt+?key? Notation
  http://xahlee.org/emacs/modernization_meta_key.html

? Emacs's Menu Usability Problem
  http://xahlee.org/emacs/modernization_menu.html

? Emacs's Mode Line Modernization Suggestions
  http://xahlee.org/emacs/modernization_mode_line.html

? Usability Problems With Emacs's Letter-Case Commands
  http://xahlee.org/emacs/modernization_upcase-word.html

? Suggestions on Emacs's mark-word Command
  http://xahlee.org/emacs/modernization_mark-word.html

? Suggestions on Emacs's Line-Cutting Commands
  http://xahlee.org/emacs/modernization_fill-paragraph.html

? Emacs Should Adopt HTML To Replace Texinfo
  http://xahlee.org/emacs/modernization_html_vs_info.html

? Emacs Should Support HTML Mail
  http://xahlee.org/emacs/modernization_html_mail.html

? Emacs's HTML Mode Sucks
  http://xahlee.org/emacs/emacs_html_sucks.html

which item, in which article, do you think that emacs is going to turn
into Notepad clone?

is the suggestion of using modern standard shortcut set of X C V for
Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
fancy Notepad clone?

Is fixing emacs's confusing undo and no redo, that is periodically
bitched by programer in blogs, considered making emacs into a Notepad
clone?

Is the suggestion for a statistics based ergonomic keybinding design
that are more faster to execute, easier on the fingers, and easier to
remember, mean it is turning emacs to a fancy notepad clone?

is the suggestion of getting rid of *scratch* buffer, and introduce a
command ?New? with shortcut Ctrl+n, that creates new buffer anytime
anywhere, which lets user create multiple scratch buffers defaulting
to any mode and compatible for the rest of Linux's shortcuts, means it
is a fancy Microsoft Notepad?

is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
+, such that it reflects the lable on the keyboard, and Richard
Stallman agrees may be a good idea, means it's Notepad?

is the suggestion of supporting html mail, and interface to gmail out
of the box, means it's becoming Microsoft Notepad?

is it simply the fact that making things easier to use, means kissing
Microsoft's ass?

Is the open source Firefox, and Google's extremely advanced
technologies and easy to use applications such as gmail, google map,
google earth, google code, all becoming Microsoft Notepad clone?

  Xah
? http://xahlee.org/

?



From python-url at phaseit.net  Thu Feb 26 04:58:34 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 26 Feb 2009 09:58:34 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb 26)
Message-ID: <go5p4a$hr9$1@lairds.us>

QOTW:  "I believe this is because Microsoft failed to understand the
original meaning of ___________________, and persisted with this
ghastly error in the name of backwards compatibility, justifying it
by suggesting that _________________________."  "Somebody should have
cards printed up..." - the comedy duo of Steve Holden and Grant Edwards
    http://groups.google.com/group/comp.lang.python/msg/5f44b59ba85c94c7
    
    
    Code challenge: generate all integers using only digits 1,2,3 and
    arithmetic operations
        http://groups.google.com/group/comp.lang.python/t/b387f99deb376392/
    
    How "pythonic" is to put code inside __init__.py?
        http://groups.google.com/group/comp.lang.python/t/ee5fe57066843c94/
    
    datetime.time treats midnight as False - is that sensible?
        http://groups.google.com/group/comp.lang.python/t/9e3914f85feb4ddc/
    
    SQLAlchemy got very much appreciation in this thread: "does a lot
    more than just an ORM, but can be used as a better DB-API too"
        http://groups.google.com/group/comp.lang.python/t/53ddd0045c89e315/
    
    FAQ: I create a big object and later destroy it. Why does memory
    usage not return to its initial value?
        http://groups.google.com/group/comp.lang.python/t/2c6ed3f94378b29c/
    
    How mmap (and numpy.memmap) works:
        http://groups.google.com/group/comp.lang.python/t/4fc4966065012dad/
    
    The right way to print 'bytes' in Python 3.0:
        http://groups.google.com/group/comp.lang.python/t/95033de64e9c35e8/
    
    How do arguments get passed to functions?
        http://groups.google.com/group/comp.lang.python/t/fb8c61eb265123db/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From tassilo at member.fsf.org  Thu Feb 26 04:59:49 2009
From: tassilo at member.fsf.org (Tassilo Horn)
Date: Thu, 26 Feb 2009 10:59:49 +0100
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org>
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com>
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com>
Message-ID: <87k57dwmay.fsf@thinkpad.tsdh.de>

Xah Lee <xahlee at gmail.com> writes:

Hi Xah,

> is the suggestion of using modern standard shortcut set of X C V for
> Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> fancy Notepad clone?

The functionality stays the same, but IMO it would confuse most users.
Killing is not cutting, yanking is not pasting.  The whole concepts
(kill-ring vs. simple copy&paste) are much different.

> Is fixing emacs's confusing undo and no redo, that is periodically
> bitched by programer in blogs, considered making emacs into a Notepad
> clone?

It's much more advanced than the usual sequential undo, but I admit that
it can get confusing sometimes.  So instead of dropping it I'd prefer to
think about a better UI for it.

> Is the suggestion for a statistics based ergonomic keybinding design
> that are more faster to execute, easier on the fingers, and easier to
> remember, mean it is turning emacs to a fancy notepad clone?

Users use different commands and your bindings may be better for you on
your querty keyboard, but I'm sure they're not on my German Dvorak Type
II keyboard.

> is the suggestion of getting rid of *scratch* buffer, and introduce a
> command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> anywhere, which lets user create multiple scratch buffers defaulting
> to any mode and compatible for the rest of Linux's shortcuts, means it
> is a fancy Microsoft Notepad?

Such a easy key like C-n is much too valuable for such a rarely used
command.  C-x b foobar RET is ok, isn't it?

> is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> +, such that it reflects the lable on the keyboard, and Richard
> Stallman agrees may be a good idea, means it's Notepad?

Nope, but I'm not sure if it's possible for emacs to get the right key.
Here, M is Alt, but Ctrl is indeed on the CapsLock key...

And it makes key sequences much longer to write with little or no
benefit.

> is the suggestion of supporting html mail, and interface to gmail out
> of the box, means it's becoming Microsoft Notepad?

Definitively not.  AFAIK Gnus can handle gmail accounts quite well.
Reading HTML mail works nice, too (with emacs-w3m as helper).  A simple
editor would be nice for some people, too.  But I guess that most
current devs arent interested in writing one, cause in "the tech
geekers" world mail is in text/plain.

Bye,
Tassilo


From mmcclaf at gmail.com  Thu Feb 26 05:02:23 2009
From: mmcclaf at gmail.com (Murray)
Date: Thu, 26 Feb 2009 05:02:23 -0500
Subject: Queries
In-Reply-To: <49A63A90.4080003@islandtraining.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
Message-ID: <B1EE9CB351104851B082ADD40129E3D3@user>

It is, however I was able to get the first 8 done, I am struggling with
these 3 particular ones. I have to make an SQL file based off of it, so this
seems to be a blockage in my works.

-----Original Message-----
From: Gary Herron [mailto:gherron at islandtraining.com] 
Sent: Thursday, February 26, 2009 1:46 AM
To: mmcclaf; python-list at python.org
Subject: Re: Queries

mmcclaf wrote:
> I have to make  some queries for 4 tables I have. The following
> relations are:
>
> Classes(class, type, country, numGuns, bore, displacement)
> Ships (name, class, launched)
> Battles (name, date)
> Outcomes (ship, battle, result)
>
> The three queries I'm stuck on are the following:
>
> 1. Find the classes that have only one ship as a member of that class
> (not all ships are listed in the Ship table)
> 2. Find the countries that had both battleships and battlecruisers
> (those fall under type in Classes)
> 3. Find those ships that "lived to fight another day"; they were
> damaged in one battle, but later fought in another.
>
> The best way for me to understand would be relational algebra for each
> of the statements.
>   


Sounds like a homework assignment.    Good luck with it.


> Any help in this would be greatly appreciated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

No virus found in this incoming message.
Checked by AVG - www.avg.com 
Version: 8.0.237 / Virus Database: 270.11.3/1971 - Release Date: 02/25/09
06:40:00



From jrod at blacknode.net  Thu Feb 26 05:05:40 2009
From: jrod at blacknode.net (Jrod)
Date: Thu, 26 Feb 2009 04:05:40 -0600
Subject: Building python extensions
Message-ID: <49A66974.8020501@blacknode.net>

Lets say I compile python 2.6.1 without readline support due to not 
having the readline headers installed prior. Is there a standard way to 
recompile the extension without having to rebuild the entire source. 
Looking at the makefile, I found the gcc line (modified to dump the 
relocatable in the source root ):

$ gcc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes -I. -I/py/site/Python-2.6.1/./Include -I. -IInclude 
-I./Include -I/usr/local/include -I/py/site/Python-2.6.1/Include 
-I/py/site/Python-2.6.1 -c /py/site/Python-2.6.1/Modules/readline.c -o 
build/temp.linux-x86_64-2.6/py/site/Python-2.6.1/Modules/readline.o -o 
readline.so

This works (cp -av readline.so /py/2.6.1/lib/python2.6/lib-dynload/), 
but is less than ideal. Maybe I am missing something in the docs? In php 
there is phpize, is there something like this for python?

'python setup.py build' builds all the extensions in Modules/

This is my first time posting here and I am pretty new to python, so 
pardon me if my my logic is a bit off. I love reading, so feel free to 
link to the relevant documentation :)

Jrod


From visco31 at gmail.com  Thu Feb 26 05:41:51 2009
From: visco31 at gmail.com (Visco Shaun)
Date: Thu, 26 Feb 2009 16:11:51 +0530
Subject: subprocess module: execution of standard binaries without shell?
Message-ID: <1235644911.8600.9.camel@ajc.k7>

hi all

while getting used to with subprocess module i failed in executuing a)
but succeeded in running b). Can anyone explain me why as i am providing
absolute path? Is this has to do anything with shared library.. which
must be accessed based on system variables?


a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True)
		==>OSError: [Errno 2] No such file or directory

b) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True, shell=True)

-- 
Thanks & Regards
visco



From lists at cheimes.de  Thu Feb 26 05:46:08 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 26 Feb 2009 11:46:08 +0100
Subject: subprocess module: execution of standard binaries without shell?
In-Reply-To: <1235644911.8600.9.camel@ajc.k7>
References: <1235644911.8600.9.camel@ajc.k7>
Message-ID: <go5rtg$mst$1@ger.gmane.org>

Visco Shaun schrieb:
> hi all
> 
> while getting used to with subprocess module i failed in executuing a)
> but succeeded in running b). Can anyone explain me why as i am providing
> absolute path? Is this has to do anything with shared library.. which
> must be accessed based on system variables?
> 
> 
> a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True)
> 		==>OSError: [Errno 2] No such file or directory

You have to use a list instead of a string here.

pipe = subprocess.Popen(["/bin/ls", "/"], stdout=subprocess.PIPE)



From jkv at unixcluster.dk  Thu Feb 26 05:46:24 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 11:46:24 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
Message-ID: <49A67300.6050303@unixcluster.dk>

Hi,

Are there any way to change the EOL character for sys.stdin.readline() 
and raw_input()?
My problem is that i cannot rely on that the clients connection to my 
application will end all lines with \n or \r\n. Sometimes they will use 
\r\000 as EOL.

Example from my code:

    sys.stdout.write('Password: ');
    #IAC DO ECHO  
    sys.stdout.write('\xFF\xFB\x01')
    password = raw_input()

If the client sends 'qwerty\r\n' everything is fine and the password get 
stored in the variable. But sometimes, depending on how broken the 
telnet client are, the client will send 'qwerty\r\000' instead and then 
my application will hang at 'password = raw_input()' forever.

Any suggestions?

Regards,
jkv




From clp2 at rebertia.com  Thu Feb 26 05:56:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 02:56:53 -0800
Subject: subprocess module: execution of standard binaries without shell?
In-Reply-To: <1235644911.8600.9.camel@ajc.k7>
References: <1235644911.8600.9.camel@ajc.k7>
Message-ID: <50697b2c0902260256x48051d6es44c2800ec1b89466@mail.gmail.com>

On Thu, Feb 26, 2009 at 2:41 AM, Visco Shaun <visco31 at gmail.com> wrote:
> hi all
>
> while getting used to with subprocess module i failed in executuing a)
> but succeeded in running b). Can anyone explain me why as i am providing
> absolute path? Is this has to do anything with shared library.. which
> must be accessed based on system variables?
>
>
> a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True)
> ? ? ? ? ? ? ? ?==>OSError: [Errno 2] No such file or directory

You need to use a list of arguments, not just a string. You're
currently telling Python to try and run a nonexistent directory
(specifically, the "ls " subdirectory of /bin), since the string way
of calling Popen assumes that the *entire* string is the path to the
executable when shell=False.

The correct way is to provide the path to the binary and then each of
its arguments, in a list:
pipe = subprocess.Popen(["/bin/ls", "/"], stdout=subprocess.PIPE,
close_fds=True)

> b) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True, shell=True)

This works because shell=True sends the string through the shell,
which tokenizes it and runs it, effectively splitting the string into
a list for you. However, shell=True is dangerous as you need to be
careful to escape special characters, whereas that's not necessary for
the 'shell=False and list' way of calling Popen.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jineu21 at hotmail.com  Thu Feb 26 06:05:25 2009
From: jineu21 at hotmail.com (Clarendon)
Date: Thu, 26 Feb 2009 03:05:25 -0800 (PST)
Subject: Delete all items in the list
Message-ID: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>

Hi. This must be a simple command but I just can't find it in the
Phthon manual. How do I delete all items with a certain condition from
a list? For instance:

L=['a', 'b', 'c', 'a']

I want to delete all 'a's from the list.
But if L.remove('a') only deletes the first 'a'.

How do you delete all 'a's?
I would really appreciate your help.

Thanks.



From bjornjobb at gmail.com  Thu Feb 26 06:07:21 2009
From: bjornjobb at gmail.com (Bjorn)
Date: Thu, 26 Feb 2009 03:07:21 -0800 (PST)
Subject: sending gmail with smtplib from behind a proxy
Message-ID: <e0b65df2-b9dc-44a1-b990-28d9d622cfaf@w35g2000yqm.googlegroups.com>

Hi, I tried the script below to send mail by gmail from python using
smptlib. I got the script here (http://kutuma.blogspot.com/2007/08/
sending-emails-via-gmail-with-python.html)

It works fine from home, but at work not. I think it is because I am
behind a http or a socks proxy server at work. Can I adapt this script
to work from behind the http or socks proxy? I couldnt understand from
the smtplib if I can specify this somehow?

Sincerely,
bjorn johansson

----Script---------
#!/usr/bin/python

import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email import Encoders
import os

gmail_user = "your_email at gmail.com"
gmail_pwd = "your_password"

def mail(to, subject, text, attach):
   msg = MIMEMultipart()

   msg['From'] = gmail_user
   msg['To'] = to
   msg['Subject'] = subject

   msg.attach(MIMEText(text))

   part = MIMEBase('application', 'octet-stream')
   part.set_payload(open(attach, 'rb').read())
   Encoders.encode_base64(part)
   part.add_header('Content-Disposition',
           'attachment; filename="%s"' % os.path.basename(attach))
   msg.attach(part)

   mailServer = smtplib.SMTP("smtp.gmail.com", 587)
   mailServer.ehlo()
   mailServer.starttls()
   mailServer.ehlo()
   mailServer.login(gmail_user, gmail_pwd)
   mailServer.sendmail(gmail_user, to, msg.as_string())
   # Should be mailServer.quit(), but that crashes...
   mailServer.close()

mail("some.person at some.address.com",
   "Hello from python!",
   "This is a email sent with python",
   "my_picture.jpg")


From clp2 at rebertia.com  Thu Feb 26 06:15:49 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 03:15:49 -0800
Subject: Delete all items in the list
In-Reply-To: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>

On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
>
> L=['a', 'b', 'c', 'a']
>
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
>
> How do you delete all 'a's?

There are several ways. I'd go with a list comprehension:

L = [i for i in L if i != 'a']

Or to modify the list in-place:

L[:] = [i for i in L if i != 'a']

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From python.list at tim.thechases.com  Thu Feb 26 06:22:27 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 26 Feb 2009 05:22:27 -0600
Subject: The Python's regex different from Perl's ,I want know what's
	the 	different?
In-Reply-To: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
References: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
Message-ID: <49A67B73.4090408@tim.thechases.com>

> The Python's regex different from Perl's ,I want know what's the
> different?

Easy:

   bash$ diff <(lynx -dump http://perldoc.perl.org/perlre.html) 
<(lynx -dump http://docs.python.org/library/re.html)


Had you tried the great Google in the sky, you might have found 
such pages as:

http://mail.python.org/pipermail/python-list/2005-April/319030.html

or even a popular book on the subject:

http://oreilly.com/catalog/9780596002893/



-tkc







From chelaskk at gmail.com  Thu Feb 26 06:28:35 2009
From: chelaskk at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 14:28:35 +0300
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
	<50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
Message-ID: <967cd34f0902260328x55d313fdpf55f8a69166f6a76@mail.gmail.com>

i did try but still not working.But also i try  os.walk() for remote
computer like  os.walk('\\192.168.0.45') it also failed>
Thats it is my main problem do i need any new imports besides import os

On 2/26/09, Chris Rebert <clp2 at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
>  > hey i want to count number of files in remote computer
>  >
>  > example of my code is
>  >
>  > import glob
>  > import os
>  > import time
>  > from datetime import date
>  > today=date.today()
>  > dir_count, file_count=0, 0
>  >
>  > for files in glob.glob('\\192.168.0.45\files\*.txt'):
>
>
> Remember that *backslash is the escape character* in Python, so you
>  need to double-up your backslashes in the string literal (or just use
>  forward slashes instead, Windows doesn't seem to care for Python in
>  most cases). Right now, the path really only starts with 1 backslash
>  and it has a formfeed character in it (\f), so it's obviously invalid;
>  thus, your problem.
>
>  So you want:
>  #looks ugly, doesn't it?
>
> for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):
>
>
> Or:
>  #will probably but not assuredly work
>
> for files in glob.glob('//192.168.0.45/files/*.txt'):
>
>
> Cheers,
>  Chris
>
>
>  --
>  Follow the path of the Iguana...
>  http://rebertia.com
>


From jerry at hotmail.com  Thu Feb 26 06:50:22 2009
From: jerry at hotmail.com (sert)
Date: Thu, 26 Feb 2009 11:50:22 +0000 (UTC)
Subject: Efficient searching through objects
Message-ID: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>

I have written a program that reads data and updates the records 
for some people. They are represented by objects, and I need to 
read the data from a file, look the person up and then update 
his record.

I have implemented this by creating a list with all the people's 
names and another list with their objects (their data).

It works but after profiling the code it turns out that half the 
time spent in the program is spent in the list.index() function 
looking up names. Isn't there a less goofy and more efficient 
way of doing this?


From dangoor at gmail.com  Thu Feb 26 07:19:52 2009
From: dangoor at gmail.com (Kevin Dangoor (Mozilla))
Date: Thu, 26 Feb 2009 04:19:52 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost> 
	<mailman.134.1234890640.11746.python-list@python.org>
	<26c3659d-ce14-4375-9da7-d9fefc4748ac@a39g2000prl.googlegroups.com>
Message-ID: <8621b9e6-0f12-4d1d-835d-7af878217c42@13g2000yql.googlegroups.com>

On Feb 17, 10:28?pm, alex23 <wuwe... at gmail.com> wrote:
> On Feb 18, 3:10?am, Robert Kern <robert.k... at gmail.com> wrote:
>
> > Its public image definitely suffers from the impression that it's "an ORM" that
> > can be compared on equal terms with packages that actually are just ORMs. I
> > describe it as a very powerful toolkit for solving a wide variety of problems
> > involving SQL databases. One of those tools happens to be an ORM.
>
> I'm going to have to steal that description the next time I try to
> sell a co-worker on the value of SQLAlchemy. There's always a strong
> reaction against the mention of ORMs, generally along the lines of it
> moving the programmer too far away from the real action. But my
> experience is identical to both andrew's and your's; there is far far
> more of value in SQLA than the ORM alone.

I just saw this thread via the weekly Python URL email and wanted to
add one bit here. When I've been selling people on using SQLAlchemy,
one argument that I make is that if you're using a relational database
for storage but your program is using objects (and good Python
programs do!), then you're doing ORM. If you're not using SQLAlchemy
(or similar), you're likely doing ORM badly.

SQLAlchemy's SQL layer definitely makes it a different beast from most
ORMs.

Kevin


From rdmurray at bitdance.com  Thu Feb 26 07:20:16 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 26 Feb 2009 12:20:16 +0000 (UTC)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
Message-ID: <go61e0$9jd$1@ger.gmane.org>

sert <jerry at hotmail.com> wrote:
> I have written a program that reads data and updates the records 
> for some people. They are represented by objects, and I need to 
> read the data from a file, look the person up and then update 
> his record.
> 
> I have implemented this by creating a list with all the people's 
> names and another list with their objects (their data).
> 
> It works but after profiling the code it turns out that half the 
> time spent in the program is spent in the list.index() function 
> looking up names. Isn't there a less goofy and more efficient 
> way of doing this?

It sounds like what you are looking for is the dictionary
data type.

--RDM



From bearophileHUGS at lycos.com  Thu Feb 26 07:21:17 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 26 Feb 2009 04:21:17 -0800 (PST)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
Message-ID: <37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>

sert:
> I have implemented this by creating a list with all the people's
> names and another list with their objects (their data).
>
> It works but after profiling the code it turns out that half the
> time spent in the program is spent in the list.index() function
> looking up names. Isn't there a less goofy and more efficient
> way of doing this?

Try using a dict instead, where keys are the names and objects the
values (it turns a linear search in a quick hash look up). . Then tell
us the performance changes.

Bye,
bearophile


From lkassana at gmail.com  Thu Feb 26 07:38:01 2009
From: lkassana at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 15:38:01 +0300
Subject: problem with glob in remote directory or os.walk in remote directory 
	in windos
Message-ID: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>

i am trying to write script which will count files for remote directory
which having certain pattern.

i tried with my code and have a look at this code.
-----------------------------------------------------------------------------------

import glob
import os
import time
from datetime import date
today=date.today()
dir_count, file_count=0, 0

for files in glob.glob('*\\192.168.0.45\files\*.txt'*):
     file_count += len(files)
print '----the count of ',today, '-------'
print 'Found', dir_count, 'sub-directories in cwd'
print 'Found', file_count, 'files in cwd'
print 'Found', dir_count + file_count, 'files & sub-directories in cwd'
filename="reconciliation.txt"
file_string= str(file_count)+','+ str(today)+'\n'
File=open(filename,"a")
File.writelines( file_string)
File.close()
--------------------------------------------------------------------------------------------------------
the problem the glob.glob() does not work in remotely directory especially
in window environment i don't know why??

i also try os.walk() for remote directory it failed i am wondering why . Do
i have to import a new module in import besides import  glob,os
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From jerry at hotmail.com  Thu Feb 26 07:42:46 2009
From: jerry at hotmail.com (sert)
Date: Thu, 26 Feb 2009 12:42:46 +0000 (UTC)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>
Message-ID: <Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>

bearophileHUGS at lycos.com wrote in
news:37632421-5475-4859-be83-07ae2eca1773 at r4g2000yqa.googlegro
ups.com: 

> Try using a dict instead, where keys are the names and
> objects the values (it turns a linear search in a quick
> hash look up). . Then tell us the performance changes.
> 

It halved the overall execution time. Thanks.


From steve at holdenweb.com  Thu Feb 26 07:44:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:44:36 -0500
Subject: File Path retrieving problem
In-Reply-To: <69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>	<go3ugf$ol7$03$1@news.t-online.com>
	<mailman.772.1235597757.11746.python-list@python.org>	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>	<mailman.785.1235621020.11746.python-list@python.org>
	<69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
Message-ID: <go62sg$eoc$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 26, 9:03 am, Steve Holden <st... at holdenweb.com> wrote:
>> music24... at gmail.com wrote:
>>> On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
>>>> Peter Otten wrote:
>>>>> Maybe it's about access rights?
>>>>> $ mkdir alpha
>>>>> $ touch alpha/beta
>>>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>>>> True
>>>>> $ chmod u-x alpha
>>>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>>>> False
>>>>> $
>>>>> I Don't know how this is handled on Windows...
>>>> Here's one way....
>>>> Microsoft Windows XP [Version 5.1.2600]
>>>> (C) Copyright 1985-2001 Microsoft Corp.
>>>> C:\>mkdir alpha
>>>> C:\>touch alpha\beta  # cygwin at work here...
>>>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>>>> True
>>>> C:\>cacls alpha /E /R "Everyone"
>>>> processed dir: C:\alpha
>>>> C:\>cacls alpha /E /R "Users"
>>>> processed dir: C:\alpha
>>>> C:\>cacls alpha /E /R "Administrators"
>>>> processed dir: C:\alpha
>>>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>>>> False
>>> Hi,
>>> This is the following code which i have used to retrieve the pathname
>>> of a filename given by the user
>>>         filename = self.enText.get() # get the text entered in the
>>> text box
>>>         if os.path.exists(filename): # checking if the filename
>>> exists , had replaced it with os.path.exists(os.path.abspath
>>> (filename))
>>>             print os.path.abspath(filename)
>>>         else:
>>>             print "Not found"
>>> actually i need to list all the files/folders with the given filename
>>> alongwith path and store it in an CSV file with index.
>>> But i am unable to get even a single filepath correctly.
>>> Whatever filename i enter the output is as : C:\Python25\WorkSpace
>>> \xyz
>>> i.e the name i entered is being appended to my workspace and
>>> displayed.
>>> Guys, i am not able to understand what shall i do here...plz help me
>>> out.
>> Look, we aren't psychic. We can't debug code and directories we can't
>> see. Work with us here - give us the information we need to help you.
>>
>> The actual code. A directory listing? Any error messages?
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> 
> 
> 
> 
> Hi Steve,
> 
> Following is the code which i have written to display a GUI textbox
> and get any name entered by the user and search the path of this
> filename and then list it into an CSV file.
> 
> For this i initially created an textbox widget and added an button to
> it.
> Now, i have entered a filename (like NEWS.txt) in the text boz,
> as you can see when i press the button i retrieve the text and then
> search its filepath.
> currently i am printing this filepath on the shell.
> 
> 
> from Tkinter import *

So this is Python 2.x ...

> import os
> from os.path import realpath, exists, abspath
> import tkMessageBox
> import Tkinter

Not sure why you bother to import Tkinter when you have above just
imported everything *from* Tkinter ...

> #import filePath
> 
> class GUIFrameWork(Frame):
>     """This is the GUI"""
> 
>     def __init__(self,master=None):
>         """Initialize yourself"""
> 
>         """Initialise the base class"""
>         Frame.__init__(self,master)
> 
>         """Set the Window Title"""
>         self.master.title("Enter Text to search")
> 
>         """Display the main window"
>         with a little bit of padding"""
>         self.grid(padx=10,pady=10)
>         self.CreateWidgets()
> 
>     def CreateWidgets(self):
> 
>         self.enText = Entry(self)
>         self.enText.grid(row=0, column=1, columnspan=3)
> 
> 
> 
>         """Create the Button, set the text and the
>         command that will be called when the button is clicked"""
>         self.btnDisplay = Button(self, text="Display!",
> command=self.Display)
>         self.btnDisplay.grid(row=0, column=4)
> 
>     def Display(self):
>         """Called when btnDisplay is clicked, displays the contents of
> self.enText"""
>         filename = self.enText.get()
>         if os.path.exists(os.path.abspath(filename)):
>             print os.path.abspath(filename)

First, move this line up one (losing an indent level) so you always
print the full path. This will verify you are looking where you think
you are looking.

>         else:
>             print "Not found"
>         #tkMessageBox.showinfo("Text", "You typed: %s" %
> os.path.abspath(os.path.dirname(filename)))
> 
>         #filepath.mydir(self.enText.get())
> 
> 
> if __name__ == "__main__":
>     guiFrame = GUIFrameWork()
>     guiFrame.mainloop()
> 
> 
> User Input: NEWS.txt
> Output: Not Found (though this file is actually present)
> 
Thanks for the information. I'm wondering whether there might be some
filename encoding issue here, but others may have some better ideas.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 26 07:47:03 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:47:03 -0500
Subject: File Path retrieving problem
In-Reply-To: <McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
Message-ID: <go6312$eoc$2@ger.gmane.org>

Dennis Lee Bieber wrote:
> On Wed, 25 Feb 2009 07:37:21 -0800 (PST), music24by7 at gmail.com declaimed
> the following in comp.lang.python:
> 
> 	WARNING -- I will probably NOT see your response; since 90+% of the
> spam in comp.lang.python is injected via googlegroups and gmail
> accounts, my client is configured to filter out messages with a from
> address having gmail.com. I only found this message by doing fetches on
> the reference header of the replies that did get by the filter.
> 
Well, since it's more likely you'll see this, let me tell you that if
you access the group via gmane (as I do) you rarely see the spam anyway.
There's been a lot more work on spam filtering lately.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 26 07:48:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 26 Feb 2009 13:48:15 +0100
Subject: Delete all items in the list
In-Reply-To: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <49a68f7b$0$2669$426a74cc@news.free.fr>

Clarendon a ?crit :
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
> 
> L=['a', 'b', 'c', 'a']
> 
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
> 
> How do you delete all 'a's?

L[:] = [item for item in L if item != 'a']



From steve at holdenweb.com  Thu Feb 26 07:51:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:51:50 -0500
Subject: Queries
In-Reply-To: <B1EE9CB351104851B082ADD40129E3D3@user>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user>
Message-ID: <go63a1$g44$1@ger.gmane.org>

Murray wrote:
[top-posting corrected]

> -----Original Message-----
> From: Gary Herron [mailto:gherron at islandtraining.com] 
> Sent: Thursday, February 26, 2009 1:46 AM
> To: mmcclaf; python-list at python.org
> Subject: Re: Queries
> 
> mmcclaf wrote:
>> I have to make  some queries for 4 tables I have. The following
>> relations are:
>>
>> Classes(class, type, country, numGuns, bore, displacement)
>> Ships (name, class, launched)
>> Battles (name, date)
>> Outcomes (ship, battle, result)
>>
>> The three queries I'm stuck on are the following:
>>
>> 1. Find the classes that have only one ship as a member of that class
>> (not all ships are listed in the Ship table)

Investigate a GROUP BY solution that selects groups having a count of 1.

>> 2. Find the countries that had both battleships and battlecruisers
>> (those fall under type in Classes)

Look at EXISTS for one possible solutions.

>> 3. Find those ships that "lived to fight another day"; they were
>> damaged in one battle, but later fought in another.
>>
>From your model description I don't even see where the position and
attitude of each ship is stored, so I don't think I can give you any
help at all with this one.

>> The best way for me to understand would be relational algebra for each
>> of the statements.
>>   
> 
> 
> Sounds like a homework assignment.    Good luck with it.
> 
> It is, however I was able to get the first 8 done, I am struggling with
> these 3 particular ones. I have to make an SQL file based off of it,
so this
> seems to be a blockage in my works.
>
Good luck with the homework. Remember to acknowledge the help you've had
from this list (particularly your earlier issues: here you just have hints).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From venutaurus539 at gmail.com  Thu Feb 26 07:55:28 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 04:55:28 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
Message-ID: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>

Hello all,
           I've a strange requirement where I need to run a python
script just as we run an exe (by double clicking through windows
explorer or by typing the script name at command prompt). In that
process I should be able to execute another python script in such a
way that, the second script should continue running but the main one
should terminate without effecting the second one.

                    My requirement may be little confusing so please
get back if you didn't understand what I meant above.


Thank you,
Venu.


From steve at holdenweb.com  Thu Feb 26 07:56:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:56:19 -0500
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
	<50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
Message-ID: <go63ie$guc$1@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
>> hey i want to count number of files in remote computer
>>
>> example of my code is
>>
>> import glob
>> import os
>> import time
>> from datetime import date
>> today=date.today()
>> dir_count, file_count=0, 0
>>
>> for files in glob.glob('\\192.168.0.45\files\*.txt'):
> 
> Remember that *backslash is the escape character* in Python, so you
> need to double-up your backslashes in the string literal (or just use
> forward slashes instead, Windows doesn't seem to care for Python in
> most cases). Right now, the path really only starts with 1 backslash
> and it has a formfeed character in it (\f), so it's obviously invalid;
> thus, your problem.
> 
> So you want:
> #looks ugly, doesn't it?
> for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):
> 
> Or:
> #will probably but not assuredly work
> for files in glob.glob('//192.168.0.45/files/*.txt'):
> 
Or:

for files in glob.glob(r'\\192.168.0.45\files\*.txt'):

Raw string literals are very useful for handling strings with lots of
backslashes in them.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From bborcic at gmail.com  Thu Feb 26 08:00:30 2009
From: bborcic at gmail.com (Boris Borcic)
Date: Thu, 26 Feb 2009 14:00:30 +0100
Subject: Delete all items in the list
In-Reply-To: <50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
Message-ID: <go63ra$jfo$1@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
...
>> L=['a', 'b', 'c', 'a']
>>
>> I want to delete all 'a's from the list.
>> But if L.remove('a') only deletes the first 'a'.
>>
>> How do you delete all 'a's?
> 
> There are several ways. I'd go with a list comprehension:

and for a couple other ways

while 'a' in L : L.remove('a')

L = filter('a'.__ne__,L)



From freelancer317 at gmail.com  Thu Feb 26 08:03:50 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Thu, 26 Feb 2009 08:03:50 -0500
Subject: Queries
In-Reply-To: <go63a1$g44$1@ger.gmane.org>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> <go63a1$g44$1@ger.gmane.org>
Message-ID: <b1d973a70902260503m157ff54ap68d24a59036fc3e7@mail.gmail.com>

2009/2/26 Steve Holden <steve at holdenweb.com>

> Murray wrote:
> [top-posting corrected]
>
> > -----Original Message-----
> > From: Gary Herron [mailto:gherron at islandtraining.com]
> > Sent: Thursday, February 26, 2009 1:46 AM
> > To: mmcclaf; python-list at python.org
> > Subject: Re: Queries
> >
> > mmcclaf wrote:
> >> I have to make  some queries for 4 tables I have. The following
> >> relations are:
> >>
> >> Classes(class, type, country, numGuns, bore, displacement)
> >> Ships (name, class, launched)
> >> Battles (name, date)
> >> Outcomes (ship, battle, result)
> >>
> >> The three queries I'm stuck on are the following:
> >>
> >> 1. Find the classes that have only one ship as a member of that class
> >> (not all ships are listed in the Ship table)
>
> Investigate a GROUP BY solution that selects groups having a count of 1.

DISTINCT may be a simpler solution.

>
>
> >> 2. Find the countries that had both battleships and battlecruisers
> >> (those fall under type in Classes)
>
> Look at EXISTS for one possible solutions.
>
> >> 3. Find those ships that "lived to fight another day"; they were
> >> damaged in one battle, but later fought in another.
> >>
> >From your model description I don't even see where the position and
> attitude of each ship is stored, so I don't think I can give you any
> help at all with this one.
>
> >> The best way for me to understand would be relational algebra for each
> >> of the statements.
> >>
> >
> >
> > Sounds like a homework assignment.    Good luck with it.
> >
> > It is, however I was able to get the first 8 done, I am struggling with
> > these 3 particular ones. I have to make an SQL file based off of it,
> so this
> > seems to be a blockage in my works.
> >
> Good luck with the homework. Remember to acknowledge the help you've had
> from this list (particularly your earlier issues: here you just have
> hints).
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
- Bret
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From tim.wintle at teamrubber.com  Thu Feb 26 08:10:15 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 13:10:15 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
Message-ID: <1235653815.7954.22.camel@tim-laptop>

On Thu, 2009-02-26 at 04:55 -0800, venutaurus539 at gmail.com wrote:
> Hello all,
>            I've a strange requirement where I need to run a python
> script just as we run an exe (by double clicking through windows
> explorer or by typing the script name at command prompt).
I don't know how windows deals with this part
>  In that
> process I should be able to execute another python script in such a
> way that, the second script should continue running but the main one
> should terminate without effecting the second one.
standard daemon behavior I'd have thought

This shows how you would do it (with lots of comments). Assume this
should work on Windows.

http://code.activestate.com/recipes/278731/

note the two child threads to prevent zombies - may not be needed on
windows but good to use them anyway.



From digitig at gmail.com  Thu Feb 26 08:25:29 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 26 Feb 2009 13:25:29 +0000
Subject: Efficient searching through objects
In-Reply-To: <Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>
	<Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
Message-ID: <aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>

2009/2/26 sert <jerry at hotmail.com>:
> bearophileHUGS at lycos.com wrote in
> news:37632421-5475-4859-be83-07ae2eca1773 at r4g2000yqa.googlegro
> ups.com:
>
>> Try using a dict instead, where keys are the names and
>> objects the values (it turns a linear search in a quick
>> hash look up). . Then tell us the performance changes.
>>
>
> It halved the overall execution time. Thanks.

Good to see that you've already got an improvement. For what it's
worth, this seems to be classic relational database stuff, and a
relational database will be optimised to do these operations and so is
likely to be faster still. I think there are a couple that Python
works well with, but I've never looked into that -- others will no
doubt be along with recommendations now I've raised the subject.

-- 
Tim Rowe


From python.list at tim.thechases.com  Thu Feb 26 08:34:11 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 26 Feb 2009 07:34:11 -0600
Subject: Efficient searching through objects
In-Reply-To: <aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>	<Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
	<aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>
Message-ID: <49A69A53.7040800@tim.thechases.com>

> relational database will be optimised to do these operations and so is
> likely to be faster still. I think there are a couple that Python
> works well with, but I've never looked into that -- others will no
> doubt be along with recommendations now I've raised the subject.

batteries-included support for sqlite[1] was added in 2.5 which 
would work pretty well for this application without the overhead 
(resource OR administrative) of something like MySQL or PostgreSQL.

-tkc

[1]
http://docs.python.org/library/sqlite3.html



From steve at holdenweb.com  Thu Feb 26 08:46:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 08:46:57 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
Message-ID: <go66hd$slr$1@ger.gmane.org>

lameck kassana wrote:
> i am trying to write script which will count files for remote directory
> which having certain pattern.
>  
Please refrain from repeating questions. When you posted this a reply
had already been made to your original posting. Remember, this isn't a
paid help desk ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From venutaurus539 at gmail.com  Thu Feb 26 09:00:03 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 06:00:03 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
Message-ID: <b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>

On Feb 26, 6:10?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > Hello all,
> > ? ? ? ? ? ?I've a strange requirement where I need to run a python
> > script just as we run an exe (by double clicking through windows
> > explorer or by typing the script name at command prompt).
>
> I don't know how windows deals with this part> ?In that
> > process I should be able to execute another python script in such a
> > way that, the second script should continue running but the main one
> > should terminate without effecting the second one.
>
> standard daemon behavior I'd have thought
>
> This shows how you would do it (with lots of comments). Assume this
> should work on Windows.
>
> http://code.activestate.com/recipes/278731/
>
> note the two child threads to prevent zombies - may not be needed on
> windows but good to use them anyway.

Thanks for the reply,
           Being a newbie to python, I am finding it difficult to
understand the logic even after thorough reading of comments. Is there
any simpler way where I can just run a python script from the main
script and exit without disturbing the second one(This will end based
on some other constraints which can be handled). Or can some one throw
some light on where should I run the function os.system(" python
script2.py") from the main one.

Thank you,
venu


From lkassana at gmail.com  Thu Feb 26 09:03:26 2009
From: lkassana at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 17:03:26 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <go66hd$slr$1@ger.gmane.org>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
Message-ID: <c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>

ok my original question is how can count the files of ceratin pattern(eg
*.txt) in remote directory .It seems use of glob.glob() for remote
directory is not working .Example I want to count the files in following
shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can do it
by using glob.glob()

On Thu, Feb 26, 2009 at 4:46 PM, Steve Holden <steve at holdenweb.com> wrote:

> lameck kassana wrote:
> > i am trying to write script which will count files for remote directory
> > which having certain pattern.
> >
> Please refrain from repeating questions. When you posted this a reply
> had already been made to your original posting. Remember, this isn't a
> paid help desk ...
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From dan.barbus at gmail.com  Thu Feb 26 09:04:39 2009
From: dan.barbus at gmail.com (utnapistim)
Date: Thu, 26 Feb 2009 06:04:39 -0800 (PST)
Subject: class property not working in python 2.5.1
References: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
	<mailman.790.1235635007.11746.python-list@python.org>
Message-ID: <54ab1846-6dfe-4109-98d8-cd3b5371b13c@s28g2000vbp.googlegroups.com>

On Feb 26, 9:56?am, Christian Heimes <li... at cheimes.de> wrote:
> Dan Barbus schrieb:
>
> > Hi,
>
> > I have a problem with setting a property to a class instance, in
> > python 2.5.1. The property is defined through get and set methods, but
> > when I set it, the setter doesn't get called. Instead, I believe the
> > property in the instance gets replaced with a new object (string).
>
> > I have the following code (stripped down from my program):
>
> > class Model():
> > ? ? def __init__(self, title = ''):
> > ? ? ? ? self._views, self._title = [], None
> > ? ? ? ? self.setTitle(title)
>
> *snip*
>
> Properties don't work correctly on old style classes. You have to
> subclass from object in order to get a new style class.
>
> class Model(object):
> ? ? pass
>
> Christian

Thanks, that solved the problem.


From mmcclaf at gmail.com  Thu Feb 26 09:06:48 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Thu, 26 Feb 2009 06:06:48 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> 
	<mailman.807.1235652909.11746.python-list@python.org>
Message-ID: <8f97b201-33b9-4c7f-a757-b76bd9db1167@f17g2000vbf.googlegroups.com>

On Feb 26, 7:51?am, Steve Holden <st... at holdenweb.com> wrote:
> Murray wrote:
>
> [top-posting corrected]
>
>
>
> > -----Original Message-----
> > From: Gary Herron [mailto:gher... at islandtraining.com]
> > Sent: Thursday, February 26, 2009 1:46 AM
> > To: mmcclaf; python-l... at python.org
> > Subject: Re: Queries
>
> > mmcclaf wrote:
> >> I have to make ?some queries for 4 tables I have. The following
> >> relations are:
>
> >> Classes(class, type, country, numGuns, bore, displacement)
> >> Ships (name, class, launched)
> >> Battles (name, date)
> >> Outcomes (ship, battle, result)
>
> >> The three queries I'm stuck on are the following:
>
> >> 1. Find the classes that have only one ship as a member of that class
> >> (not all ships are listed in the Ship table)
>
> Investigate a GROUP BY solution that selects groups having a count of 1.
>
> >> 2. Find the countries that had both battleships and battlecruisers
> >> (those fall under type in Classes)
>
> Look at EXISTS for one possible solutions.
>
> >> 3. Find those ships that "lived to fight another day"; they were
> >> damaged in one battle, but later fought in another.
>
> >From your model description I don't even see where the position and
>
> attitude of each ship is stored, so I don't think I can give you any
> help at all with this one.
>
> >> The best way for me to understand would be relational algebra for each
> >> of the statements.
>
> > Sounds like a homework assignment. ? ?Good luck with it.
>
> > It is, however I was able to get the first 8 done, I am struggling with
> > these 3 particular ones. I have to make an SQL file based off of it,
> so this
> > seems to be a blockage in my works.
>
> Good luck with the homework. Remember to acknowledge the help you've had
> from this list (particularly your earlier issues: here you just have hints).
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266?+1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Yeppers always do. And thanks! As for the number 3 one... to know if
they were damaged would appear in "Result" of the Outcomes table


From venutaurus539 at gmail.com  Thu Feb 26 09:09:22 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 06:09:22 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
Message-ID: <328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>

On Feb 26, 7:00?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 26, 6:10?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
>
>
> > On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > > Hello all,
> > > ? ? ? ? ? ?I've a strange requirement where I need to run a python
> > > script just as we run an exe (by double clicking through windows
> > > explorer or by typing the script name at command prompt).
>
> > I don't know how windows deals with this part> ?In that
> > > process I should be able to execute another python script in such a
> > > way that, the second script should continue running but the main one
> > > should terminate without effecting the second one.
>
> > standard daemon behavior I'd have thought
>
> > This shows how you would do it (with lots of comments). Assume this
> > should work on Windows.
>
> >http://code.activestate.com/recipes/278731/
>
> > note the two child threads to prevent zombies - may not be needed on
> > windows but good to use them anyway.
>
> Thanks for the reply,
> ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
> understand the logic even after thorough reading of comments. Is there
> any simpler way where I can just run a python script from the main
> script and exit without disturbing the second one(This will end based
> on some other constraints which can be handled). Or can some one throw
> some light on where should I run the function os.system(" python
> script2.py") from the main one.
>
> Thank you,
> venu

Adding to the above.. I've to do it in Windows platform and what I can
see from the illustration (/dev/null) etc. they are for Unix
Environment.

Thank you,
Venu


From steve at holdenweb.com  Thu Feb 26 09:15:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 09:15:23 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
Message-ID: <49A6A3FB.60708@holdenweb.com>

lameck kassana wrote:
> ok my original question is how can count the files of ceratin pattern(eg
> *.txt) in remote directory .It seems use of glob.glob() for remote
> directory is not working .Example I want to count the files in following
> shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can
> do it by using glob.glob() 
> 
>>> glob.glob(r"\\houseboy\sholden\*.txt")
['\\\\houseboy\\sholden\\pgin1.txt',
'\\\\houseboy\\sholden\\POSTGRES.TXT',
'\\\\houseboy\\sholden\\gatesquote.txt',
'\\\\houseboy\\sholden\\UbuntuWhatNow.txt',
 '\\\\houseboy\\sholden\\patch001.txt']
>>> glob.glob(r"\\192.168.2.200\sholden\*.txt")
['\\\\192.168.2.200\\sholden\\pgin1.txt',
'\\\\192.168.2.200\\sholden\\POSTGRES.TXT',
'\\\\192.168.2.200\\sholden\\gatesquote.txt',
'\\\\192.168.2.200\\sholden\\UbuntuWhatNow.txt',
'\\\\192.168.2.200\\sholden\\patch001.txt']
>>>

Working just fine for me.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From freelancer317 at gmail.com  Thu Feb 26 09:20:47 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Thu, 26 Feb 2009 09:20:47 -0500
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>
Message-ID: <b1d973a70902260620r30b54abdufc371671446dc370@mail.gmail.com>

2009/2/26 venutaurus539 at gmail.com <venutaurus539 at gmail.com>

> On Feb 26, 7:00 pm, "venutaurus... at gmail.com"
> <venutaurus... at gmail.com> wrote:
> > On Feb 26, 6:10 pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> >
> >
> >
> > > On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > > > Hello all,
> > > >            I've a strange requirement where I need to run a python
> > > > script just as we run an exe (by double clicking through windows
> > > > explorer or by typing the script name at command prompt).
> >
> > > I don't know how windows deals with this part>  In that
> > > > process I should be able to execute another python script in such a
> > > > way that, the second script should continue running but the main one
> > > > should terminate without effecting the second one.
> >
> > > standard daemon behavior I'd have thought
> >
> > > This shows how you would do it (with lots of comments). Assume this
> > > should work on Windows.
> >
> > >http://code.activestate.com/recipes/278731/
> >
> > > note the two child threads to prevent zombies - may not be needed on
> > > windows but good to use them anyway.
> >
> > Thanks for the reply,
> >            Being a newbie to python, I am finding it difficult to
> > understand the logic even after thorough reading of comments. Is there
> > any simpler way where I can just run a python script from the main
> > script and exit without disturbing the second one(This will end based
> > on some other constraints which can be handled). Or can some one throw
> > some light on where should I run the function os.system(" python
> > script2.py") from the main one.
> >
> > Thank you,
> > venu
>
> Adding to the above.. I've to do it in Windows platform and what I can
> see from the illustration (/dev/null) etc. they are for Unix
> Environment.


For making a script executable try this link
http://www.python.org/doc/faq/windows/#how-do-i-make-python-scripts-executable



-- 
- Bret
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From gagsl-py2 at yahoo.com.ar  Thu Feb 26 09:27:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 12:27:31 -0200
Subject: thread safe to lock on key, val pairs on a dict instead of entire
	dict?
References: <bc40b182-4f9f-4e5e-964c-16042f2179aa@o11g2000yql.googlegroups.com>
Message-ID: <op.upyqf5h2x6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 00:39:30 -0200, birdsong <david.birdsong at gmail.com>  
escribi?:

> Dictionaries just store references to objects, right?  So is it thread
> safe to lock a specific key/val pair on a dictionary and modify its
> val and release the lock?
>
> example snippet:
> # assuming d_lock  was initialized long ago in a thread-safe manner
> d_lock.acquire()
> d = {}
> d[1] = (threading.Lock(), [])
> d_lock.release()
>
> # test key level locking
> for key, data in d.items():
>   row_lock, rows = data
>   row_lock.acquire()
>   rows.append(1)
>   row_lock.release()
>
> Of course, I'll have to lock the entire dict when adding keys that
> dont exist, but further calls and acquire the key specific lock before
> doing any write operations.

(All of this applies to CPython only)
Subscript assignment is a single opcode. If the key's __hash__ and  
__eq__/__cmp__ don't call any Python code, nor does the destructor of the  
previous dict entry, then the operation is atomic (no other thread may be  
executed due to the GIL).
list.append is atomic.

Note that the *append* operation is atomic (or the dict assignment), not  
the whole statement:
L.append(some[values]+to**be.computed(L))
Evaluating the argument to append isn't atomic at all.

References:
http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm
http://effbot.org/zone/thread-synchronization.htm
http://coreygoldberg.blogspot.com/2008/09/python-thread-synchronization-and.html

-- 
Gabriel Genellina



From jdnier at gmail.com  Thu Feb 26 09:38:34 2009
From: jdnier at gmail.com (David Niergarth)
Date: Thu, 26 Feb 2009 06:38:34 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>

On Feb 16, 11:21?pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
> Could anyone please explain why this happens? ?It seems some memory
> are not freed.

There is a "bug" in versions of Python prior to 2.5 where memory
really isn't released back to the OS. Python 2.5 contains a new object
allocator that is able to return memory to the operating system that
fixes this issue. Here's an explanation:

http://evanjones.ca/python-memory-part3.html

What version of Python are you using? I have a machine running several
long-running processes, each of which occasionally spike up to 500M
memory usage, although normally they only require about 25M. Prior to
2.5, those processes never released that memory back to the OS and I
would need to periodically restart them. With 2.5, this is no longer a
problem. I don't always see memory usage drop back down immediately
but the OS does recover the memory eventually. Make sure you use 2.5
if this is an issue for you.

--David


From tim.wintle at teamrubber.com  Thu Feb 26 09:47:47 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 14:47:47 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
Message-ID: <1235659667.7954.56.camel@tim-laptop>

On Thu, 2009-02-26 at 06:00 -0800, venutaurus539 at gmail.com wrote:
> Thanks for the reply,
>            Being a newbie to python, I am finding it difficult to
> understand the logic even after thorough reading of comments. Is there
> any simpler way where I can just run a python script from the main
> script and exit without disturbing the second one(This will end based
> on some other constraints which can be handled). Or can some one throw
> some light on where should I run the function os.system(" python
> script2.py") from the main one.

That would be a simple way of doing it :-)



From jdnier at gmail.com  Thu Feb 26 10:00:34 2009
From: jdnier at gmail.com (David Niergarth)
Date: Thu, 26 Feb 2009 07:00:34 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org> 
	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>
Message-ID: <adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>

Tim Peters showed a way to demonstrate the fix in

http://mail.python.org/pipermail/python-dev/2006-March/061991.html

> For simpler fun, run this silly little program, and look at memory
> consumption at the prompts:
>
> """
> x = []
> for i in xrange(1000000):
>    x.append([])
> raw_input("full ")
> del x[:]
> raw_input("empty ")
> """
>
> For example, in a release build on WinXP, VM size is about 48MB at the
> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
> (without this patch), VM size falls relatively little from what it is
> at the "full" prompt (the contiguous vector holding a million
> PyObject* pointers is freed, but the obmalloc arenas holding a
> million+1 list objects are never freed).
>
> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>
>     http://evanjones.ca/memory-allocator.pdf

I'm not sure what deleting a slice accomplishes (del x[:]); the
behavior is the same whether I do del x or del x[:]. Any ideas?

--David


From hv at tbz-pariv.de  Thu Feb 26 10:10:02 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Thu, 26 Feb 2009 16:10:02 +0100
Subject: OT: handling multiple software repositories
Message-ID: <70npmbFgb464U1@mid.individual.net>

Hi,

this is a bit off topic.

In our company we have several SVN repositories.

According to [1] Trac by default only handles one
repository.

Of course Trac links like changeset [1234] would not work anymore.
You would need [repro/1234] or something like this.

I think many (python) programmer have several repositories
and need to handle this somehow.

How do you do this?

I want a common wiki and a common bug tracker. It should
be possible to attach a bug to several repositories.

Up to now I don't use Trac, if someone has an alternative, please
tell me!

  Thomas

[1] http://trac.edgewall.org/wiki/MultipleRepositorySupport


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From ptmcg at austin.rr.com  Thu Feb 26 10:11:08 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 26 Feb 2009 09:11:08 -0600
Subject: XML Parsing
In-Reply-To: <206436.56338.qm@web27404.mail.ukl.yahoo.com>
References: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>
	<206436.56338.qm@web27404.mail.ukl.yahoo.com>
Message-ID: <D891AF9DC46D4271869FA07F178F50B9@AWA2>

You flatter me sir (or madam? can't tell from your name...), but I wouldn't
presume to so lofty a title among this crowd.  I'd save that for the likes
of Alan Gauld and Kent Johnson, who are much more prolific  and informative
contributors to this list than I.

-- Paul


-----Original Message-----
From: hrishy [mailto:hrishys at yahoo.co.uk] 
Sent: Wednesday, February 25, 2009 11:36 PM
To: python-list at python.org; Paul McGuire
Subject: Re: XML Parsing

Ha the guru himself responding :-)


--- On Wed, 25/2/09, Paul McGuire <ptmcg at austin.rr.com> wrote:

> From: Paul McGuire <ptmcg at austin.rr.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 2:04 PM On Feb 25, 1:17?am, hrishy 
> <hris... at yahoo.co.uk>
> wrote:
> > Hi
> >
> > Something like this
> >
> <snip solution using ElementTree>
> >
> > Note i am not a python programmer just a enthusiast
> and i was curious why people on the list didnt suggest a code like 
> above
> >
> 
> You just beat the rest of us to it - good example of ElementTree for 
> parsing XML (and I Iearned the '//' shortcut for one or more 
> intervening tag levels).
> 
> To the OP: if you are parsing XML, I would look hard at the modules 
> (esp. ElementTree) that are written explicitly for XML, before 
> considering using regular expressions.  There are just too many 
> potential surprises when trying to match XML tags - presence/absence/ 
> order of attributes, namespaces, whitespace inside tags, to name a 
> few.
> 
> -- Paul
> --
> http://mail.python.org/mailman/listinfo/python-list


      



From gagsl-py2 at yahoo.com.ar  Thu Feb 26 10:26:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 13:26:56 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org>
Message-ID: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 11:00:30 -0200, Boris Borcic <bborcic at gmail.com>  
escribi?:

> Chris Rebert wrote:
>> On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
> ...
>>> L=['a', 'b', 'c', 'a']
>>>
>>> I want to delete all 'a's from the list.
>>> But if L.remove('a') only deletes the first 'a'.
>>>
>>> How do you delete all 'a's?
>>  There are several ways. I'd go with a list comprehension:
>
> and for a couple other ways
>
> while 'a' in L : L.remove('a')

This is probably the worst way, takes cuadratic time (and two searches per  
loop).

> L = filter('a'.__ne__,L)

And this is probably the fastest. But not all types define __ne__ so a  
more generic answer would be:

 from functools import partial
 from operator import ne
L = filter(partial(ne, 'a'), L)

Of course, this is only relevant if L is large and there are many  
duplicates. In other cases I'd stick with the list comprehension as posted  
by Chris Rebert.

-- 
Gabriel Genellina



From mal at egenix.com  Thu Feb 26 10:27:44 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 26 Feb 2009 16:27:44 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
In-Reply-To: <70krl9Fbuqj5U1@mid.dfncis.de>
References: <70krdfFc7rn0U1@mid.dfncis.de> <70krl9Fbuqj5U1@mid.dfncis.de>
Message-ID: <49A6B4F0.6040600@egenix.com>

On 2009-02-25 13:25, Helmut Jarausch wrote:
> Helmut Jarausch wrote:
>> Hi,
>>
>> I've just tried to write a simple example using PyCrypto's
>> AES (CBC mode)
>>
>> #!/usr/bin/python
>> from Crypto.Cipher import AES
>>
>> PWD='abcdefghijklmnop'
>> Initial16bytes='0123456789ABCDEF'
>>
>> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
>> # crypt = AES.new(PWD, AES.MODE_ECB)
>>
>> txt = 'ea523a664dabaa4476d31226a1e3bab0'
>>
>> c = crypt.encrypt(txt)
>>
>> txt_plain=crypt.decrypt(c)
>>
>> print txt_plain
>>
>> Unfortunately, txt_plain differs from txt - why?
>> (Using MODE_ECB does work however)
>>
> 
> I just discovered that the following variant seems to work
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
> c = crypt.encrypt(txt)
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes) # <<< re-initialize
> txt_plain=crypt.decrypt(c)
> 
> So, the crypt object seems to keep some state.
> I haven't seen this mentioned in the documentation.

In CBC mode, all previous encryptions affect the next one,
since the blocks are chained:

http://en.wikipedia.org/wiki/Cipher_block_chaining#Cipher-block_chaining_.28CBC.29

In ECB mode, they are not, but then it doesn't provide much
security unless you change the key frequently:

http://en.wikipedia.org/wiki/Cipher_block_chaining#Electronic_codebook_.28ECB.29

(the wiki pages provide some nice graphics to see what's going
on and why CBC is better than ECB)

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 26 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From venutaurus539 at gmail.com  Thu Feb 26 10:32:27 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 07:32:27 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<mailman.819.1235659670.11746.python-list@python.org>
Message-ID: <74abbd25-624a-4f79-8ffe-249b625d0c74@w34g2000yqm.googlegroups.com>

On Feb 26, 7:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2009-02-26 at 06:00 -0800, venutaurus... at gmail.com wrote:
> > Thanks for the reply,
> > ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
> > understand the logic even after thorough reading of comments. Is there
> > any simpler way where I can just run a python script from the main
> > script and exit without disturbing the second one(This will end based
> > on some other constraints which can be handled). Or can some one throw
> > some light on where should I run the function os.system(" python
> > script2.py") from the main one.
>
> That would be a simple way of doing it :-)

When I run that script on Windows it fails throwing the below error:

AttributeError: 'module' object has no attribute 'fork'

Please help me out..



From Shawn at Milochik.com  Thu Feb 26 10:35:44 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Thu, 26 Feb 2009 10:35:44 -0500
Subject: The Python's regex different from Perl's , I want know what's the 
	different?
In-Reply-To: <49A67B73.4090408@tim.thechases.com>
References: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
	<49A67B73.4090408@tim.thechases.com>
Message-ID: <2dc0c81b0902260735u491d5cbbr9b72e021cd0ae334@mail.gmail.com>

The regular expression syntax is basically exactly the same. The main
difference is that a regex can't just be written into a statement as
part of the syntax; you have to create a regular expression object and
use its methods.

So, instead of:
    new_thing =~ s/pattern/replacement/
it's:
    myPattern = re.compile(r'pattern')
    new_thing = myPattern.sub(replacement, input_string)
or:
    new_thing = re.sub(pattern, replacement, input_string)

Also, backreferences are \1 instead of $1, and you have to escape the
backslash or use a raw string for the backslash.

I've found this page to be pretty helpful:
http://www.regular-expressions.info/python.html

Shawn


From jjposner at snet.net  Thu Feb 26 10:44:03 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 26 Feb 2009 10:44:03 -0500
Subject: Delete all items in the list
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org> <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <A5856B8A28E74BC4A0DCE2BE985B292D@AMDUP>

 >> 
 >> > L = filter('a'.__ne__,L)
 >> 
 >> And this is probably the fastest. But not all types define 
 >> __ne__ so a  
 >> more generic answer would be:
 >> 
 >>  from functools import partial
 >>  from operator import ne
 >> L = filter(partial(ne, 'a'), L)
 >> 

And don't forget this "traditional" solution:

>>> L=['a', 'b', 'c', 'a']
>>> filter(lambda arg: arg != 'a', L)
['b', 'c']

-John





E-mail message checked by Spyware Doctor (6.0.0.386)
Database version: 5.11850
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From jjposner at snet.net  Thu Feb 26 10:52:19 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 26 Feb 2009 10:52:19 -0500
Subject: functools.partial (was: Delete all items in the list)
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org> <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <F4970D8BAF9B4623830ADA7BC67F2452@AMDUP>

 >> 
 >>  from functools import partial
 >>  from operator import ne
 >> L = filter(partial(ne, 'a'), L)
 >> 

I learned about functools.partial only recently (on this list). functools is
implemented in C, not Python, so I couldn't answer this question for myself:

  Is functools.partial completely equivalent to a manually-coded closure?

Help, please.

-John





E-mail message checked by Spyware Doctor (6.0.0.386)
Database version: 5.11850
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From mail at timgolden.me.uk  Thu Feb 26 11:10:15 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 26 Feb 2009 16:10:15 +0000
Subject: OT: handling multiple software repositories
In-Reply-To: <70npmbFgb464U1@mid.individual.net>
References: <70npmbFgb464U1@mid.individual.net>
Message-ID: <49A6BEE7.2090605@timgolden.me.uk>

Thomas Guettler wrote:
> Hi,
> 
> this is a bit off topic.
> 
> In our company we have several SVN repositories.
> 
> According to [1] Trac by default only handles one
> repository.
> 
> Of course Trac links like changeset [1234] would not work anymore.
> You would need [repro/1234] or something like this.
> 
> I think many (python) programmer have several repositories
> and need to handle this somehow.
> 
> How do you do this?
> 
> I want a common wiki and a common bug tracker. It should
> be possible to attach a bug to several repositories.
> 
> Up to now I don't use Trac, if someone has an alternative, please
> tell me!


Have a look at DrProject[1], a Trac-alike which handles
multiple projects. (Not used it myself).

TJG

[1] https://www.drproject.org/


From mmcclaf at gmail.com  Thu Feb 26 11:17:19 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Thu, 26 Feb 2009 08:17:19 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> 
	<mailman.807.1235652909.11746.python-list@python.org>
	<8f97b201-33b9-4c7f-a757-b76bd9db1167@f17g2000vbf.googlegroups.com>
Message-ID: <51a7b90d-50ee-45d4-800e-541f01e81e66@m4g2000vbp.googlegroups.com>

Another problem with this assignment... I have to list all the ships
mentioned in the database. All the ships may not appear in the Ships
relations... I said the following in algebraic expression

SELECT name(Ships UNION (SELECT ship (Outcome UNION(SELECT class
(Classes)))

Would that work?


From google at mrabarnett.plus.com  Thu Feb 26 11:18:19 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 26 Feb 2009 16:18:19 +0000
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
References: <49A67300.6050303@unixcluster.dk>
Message-ID: <49A6C0CB.3000704@mrabarnett.plus.com>

jkv wrote:
> Hi,
> 
> Are there any way to change the EOL character for sys.stdin.readline() 
> and raw_input()?
> My problem is that i cannot rely on that the clients connection to my 
> application will end all lines with \n or \r\n. Sometimes they will use 
> \r\000 as EOL.
> 
> Example from my code:
> 
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
> 
> If the client sends 'qwerty\r\n' everything is fine and the password get 
> stored in the variable. But sometimes, depending on how broken the 
> telnet client are, the client will send 'qwerty\r\000' instead and then 
> my application will hang at 'password = raw_input()' forever.
> 
> Any suggestions?
> 
Could you insert some kind of filter into the input stream? The filter
would replace '\r\000' with '\r\n' (or just '\000' with '\n').

old_stdin = sys.stdin
try:
    sys.stdin = MyFilter(sys.stdin)
    ...
finally:
    sys.stdin = old_stdin

I don't know how many methods you would need to provide.


From kyrie at uh.cu  Thu Feb 26 11:22:38 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Thu, 26 Feb 2009 11:22:38 -0500
Subject: OT: handling multiple software repositories
In-Reply-To: <49A6BEE7.2090605@timgolden.me.uk>
References: <70npmbFgb464U1@mid.individual.net>
	<49A6BEE7.2090605@timgolden.me.uk>
Message-ID: <200902261122.38127.kyrie@uh.cu>

On Thursday 26 February 2009 11:10:15 am Tim Golden wrote:
> Have a look at DrProject[1], a Trac-alike which handles
> multiple projects. (Not used it myself).
>
> [1] https://www.drproject.org/

I've used DrProject a bit (my gf is one of the developers). If you like trac, 
chances are that you will love DrProject.

It's quite good (and easy to install, unlike gforge), but the developers are 
moving on to a version 2.0 that you can find around here: 

http://basieproject.org/   (yeah, the website is ugly). 

If you like trac, take a look at DrProject and keep an eye on Basie.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From steve at holdenweb.com  Thu Feb 26 11:30:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 11:30:41 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>
	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
Message-ID: <go6g4f$3b5$1@ger.gmane.org>

David Niergarth wrote:
> Tim Peters showed a way to demonstrate the fix in
> 
> http://mail.python.org/pipermail/python-dev/2006-March/061991.html
> 
>> For simpler fun, run this silly little program, and look at memory
>> consumption at the prompts:
>>
>> """
>> x = []
>> for i in xrange(1000000):
>>    x.append([])
>> raw_input("full ")
>> del x[:]
>> raw_input("empty ")
>> """
>>
>> For example, in a release build on WinXP, VM size is about 48MB at the
>> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
>> (without this patch), VM size falls relatively little from what it is
>> at the "full" prompt (the contiguous vector holding a million
>> PyObject* pointers is freed, but the obmalloc arenas holding a
>> million+1 list objects are never freed).
>>
>> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>>
>>     http://evanjones.ca/memory-allocator.pdf
> 
> I'm not sure what deleting a slice accomplishes (del x[:]); the
> behavior is the same whether I do del x or del x[:]. Any ideas?
> 
del x removes the name x from the current namespace, garbage collecting
the object to which it referred. del x[:] leaves x referencing a cleared
list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Thu Feb 26 11:41:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 14:41:07 -0200
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<mailman.819.1235659670.11746.python-list@python.org>
	<74abbd25-624a-4f79-8ffe-249b625d0c74@w34g2000yqm.googlegroups.com>
Message-ID: <op.upywmtfex6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 13:32:27 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

> On Feb 26, 7:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
>> On Thu, 2009-02-26 at 06:00 -0800, venutaurus... at gmail.com wrote:
>> > Thanks for the reply,
>> > ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
>> > understand the logic even after thorough reading of comments. Is there
>> > any simpler way where I can just run a python script from the main
>> > script and exit without disturbing the second one(This will end based
>> > on some other constraints which can be handled). Or can some one throw
>> > some light on where should I run the function os.system(" python
>> > script2.py") from the main one.
>>
>> That would be a simple way of doing it :-)
>
> When I run that script on Windows it fails throwing the below error:
>
> AttributeError: 'module' object has no attribute 'fork'
>
> Please help me out..

Unless you have any special needs, just stick to os.system("...")

-- 
Gabriel Genellina



From dchandran1 at yahoo.com  Thu Feb 26 11:49:24 2009
From: dchandran1 at yahoo.com (Deepak Chandran)
Date: Thu, 26 Feb 2009 08:49:24 -0800 (PST)
Subject: embedding Python in a shared library
Message-ID: <17626.86208.qm@web111101.mail.gq1.yahoo.com>

I have embedded Python in a shared library. This works fine in Windows (dll), but I get the following error is Ubuntu when I try to load modules:
/usr/lib/python2.5/lib-dynload/time.so: error: symbol lookup
error: undefined symbol: PyExc_ValueError



I found many postings on this issue on the internet, but I was not able to find a solution that worked. I tried to load libpython2.5.so.1 into my program using dlopen, but that crashed the program for some reason. I tried building my library using the libpython2.5.a, but the same error was there.

I am sure someone has a solution to this, since it seems like a general issue. 


      
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From benjamin at python.org  Thu Feb 26 11:58:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 26 Feb 2009 16:58:43 +0000 (UTC)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
Message-ID: <loom.20090226T165802-937@post.gmane.org>

Raymond Hettinger <python <at> rcn.com> writes:

> 
> Here's a proposed implementation for Py2.7 and Py3.1:
> 
>     http://code.activestate.com/recipes/576669/
> 
> Would like you guys to kick the tires, exercise it a bit, and let me
> know what you think.  The recipe runs under 2.6 and 3.0 without
> modification so it should be easy to play with.

Why not just inherit from collections.MutableMapping?





From tjreedy at udel.edu  Thu Feb 26 13:11:31 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:11:31 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
References: <49A67300.6050303@unixcluster.dk>
Message-ID: <go6m0e$q8j$1@ger.gmane.org>

jkv wrote:
> Hi,
> 
> Are there any way to change the EOL character for sys.stdin.readline() 
> and raw_input()?
> My problem is that i cannot rely on that the clients connection to my 
> application will end all lines with \n or \r\n. Sometimes they will use 
> \r\000 as EOL.
> 
> Example from my code:
> 
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
> 
> If the client sends 'qwerty\r\n' everything is fine and the password get 
> stored in the variable. But sometimes, depending on how broken the 
> telnet client are, the client will send 'qwerty\r\000' instead and then 
> my application will hang at 'password = raw_input()' forever.

Can you put that in a separate thread with timeout?



From patrick.oloughlin at gmail.com  Thu Feb 26 13:14:56 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Thu, 26 Feb 2009 18:14:56 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
Message-ID: <cc34a9320902261014o2397e59bm7a5df2a7619287df@mail.gmail.com>

Try this as an outline:
#### script1.py
from subprocess import Popen

if __name__ == '__main__':
	scriptname = "script2.py"

	Popen("python %s" % scriptname, shell=True)


	print "I'm done"


#### script2.py
from time import sleep

if __name__ == '__main__':
    while (True):
        print "waiting.."
        sleep(2)

###########################
If you install python using the Windows Installer (.exe), it should
set up .py files to be opened by python when double-clicking on them.
Alternatively, you can right-click on your .py file and go to "Open
With..." then "choose program", then click "Browse...", you can Browse
to the python executable, so Explorer will use it to open .py files
when you double-click on them.

As someone else mentioned there is also a py2exe program. Google it.

2009/2/26 venutaurus539 at gmail.com <venutaurus539 at gmail.com>:
> Hello all,
> ? ? ? ? ? I've a strange requirement where I need to run a python
> script just as we run an exe (by double clicking through windows
> explorer or by typing the script name at command prompt). In that
> process I should be able to execute another python script in such a
> way that, the second script should continue running but the main one
> should terminate without effecting the second one.
>
> ? ? ? ? ? ? ? ? ? ?My requirement may be little confusing so please
> get back if you didn't understand what I meant above.
>
>
> Thank you,
> Venu.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From mkhitrov at gmail.com  Thu Feb 26 13:17:42 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 26 Feb 2009 13:17:42 -0500
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
Message-ID: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>

Greetings,

I'm looking for a function in the standard library or pywin32 package
that will block until a certain condition is met or it is interrupted
by Ctrl-C. For example, time.sleep() would have been perfect for my
needs if thread.interrupt_main() could interrupt the call from another
thread in the same way that Ctrl-C does. Unfortunately, that is not
the case.

Another thing I tried was creating a pipe with os.pipe() and issuing a
read call on it. The event to exit was a single byte written to the
other end of the pipe, but Ctrl-C could not interrupt the read call.
The threading.Event class does not work for me, because it uses short
sleep intervals for timed waits. I need the reaction to be as close to
instant as possible, something like this will not do:

while not <some condition is met>:
   sleep(0.01)

I actually replaced threading.Event with my own version that uses
native Windows events, and waits on those also cannot be interrupted
by Ctrl-C. I'm trying to achieve the same effect as that while loop
and I don't care what the condition to exit is, but the loop needs to
exit as soon as the condition is met without waiting for up to X
additional milliseconds. Any ideas?

- Max


From tjreedy at udel.edu  Thu Feb 26 13:22:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:22:12 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <go6g4f$3b5$1@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
	<go6g4f$3b5$1@ger.gmane.org>
Message-ID: <go6mkf$q8j$2@ger.gmane.org>

Steve Holden wrote:
> David Niergarth wrote:
>> Tim Peters showed a way to demonstrate the fix in
>>
>> http://mail.python.org/pipermail/python-dev/2006-March/061991.html
>>
>>> For simpler fun, run this silly little program, and look at memory
>>> consumption at the prompts:
>>>
>>> """
>>> x = []
>>> for i in xrange(1000000):
>>>    x.append([])
>>> raw_input("full ")
>>> del x[:]
>>> raw_input("empty ")
>>> """
>>>
>>> For example, in a release build on WinXP, VM size is about 48MB at the
>>> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
>>> (without this patch), VM size falls relatively little from what it is
>>> at the "full" prompt (the contiguous vector holding a million
>>> PyObject* pointers is freed, but the obmalloc arenas holding a
>>> million+1 list objects are never freed).
>>>
>>> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>>>
>>>     http://evanjones.ca/memory-allocator.pdf
>> I'm not sure what deleting a slice accomplishes (del x[:]); the
>> behavior is the same whether I do del x or del x[:]. Any ideas?
>>
> del x removes the name x from the current namespace, garbage collecting
> the object to which it referred.

If there is another reference to the list, which there well might be in 
an actual application with memory problems, then 'del x' only 
disassociates the name but the object and its large contents are not gc'ed.

 > del x[:] leaves x referencing a cleared list.

which is guaranteed to be cleared, regardless of other refs.

Terry



From tjreedy at udel.edu  Thu Feb 26 13:22:18 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:22:18 -0500
Subject: Delete all items in the list
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>
	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <go6mkl$q8j$3@ger.gmane.org>

Gabriel Genellina wrote:

> 
>> L = filter('a'.__ne__,L)
> 
> And this is probably the fastest. But not all types define __ne__ 

In Py3, all classes inherit .__ne__ from 'object'.



From steve at holdenweb.com  Thu Feb 26 13:40:04 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 13:40:04 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <go6mkf$q8j$2@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>	<go6g4f$3b5$1@ger.gmane.org>
	<go6mkf$q8j$2@ger.gmane.org>
Message-ID: <go6nn4$4an$1@ger.gmane.org>

Terry Reedy wrote:
> Steve Holden wrote:
>> David Niergarth wrote:
[...]
>>> I'm not sure what deleting a slice accomplishes (del x[:]); the
>>> behavior is the same whether I do del x or del x[:]. Any ideas?
>>>
>> del x removes the name x from the current namespace, garbage collecting
>> the object to which it referred.
> 
> If there is another reference to the list, which there well might be in
> an actual application with memory problems, then 'del x' only
> disassociates the name but the object and its large contents are not gc'ed.
> 
>> del x[:] leaves x referencing a cleared list.
> 
> which is guaranteed to be cleared, regardless of other refs.
> 
Nice catch, Terry! You correctly spotted I was assuming that d
represented the only reference to the list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 26 13:42:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 13:42:51 -0500
Subject: Delete all items in the list
In-Reply-To: <go6mkl$q8j$3@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>
	<go6mkl$q8j$3@ger.gmane.org>
Message-ID: <go6nsb$4an$2@ger.gmane.org>

Terry Reedy wrote:
> Gabriel Genellina wrote:
> 
>>
>>> L = filter('a'.__ne__,L)
>>
>> And this is probably the fastest. But not all types define __ne__ 
> 
> In Py3, all classes inherit .__ne__ from 'object'.
> 
Isn't that inherited method just an identity comparison?

However in this particular case the main point is that str *does*
implement __ne__. So as long as that built-in method doesn't call the
other operand's __ne__ there should be no problem.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From skip at pobox.com  Thu Feb 26 13:59:03 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu, 26 Feb 2009 12:59:03 -0600
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A6C0CB.3000704@mrabarnett.plus.com>
References: <49A67300.6050303@unixcluster.dk>
	<49A6C0CB.3000704@mrabarnett.plus.com>
Message-ID: <18854.58999.266079.542928@montanaro.dyndns.org>

What is it about with statements that makes you want to so frequently embed
them in try/except statements?

Skip


From jkv at unixcluster.dk  Thu Feb 26 14:06:06 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 20:06:06 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <go6m0e$q8j$1@ger.gmane.org>
References: <49A67300.6050303@unixcluster.dk> <go6m0e$q8j$1@ger.gmane.org>
Message-ID: <49A6E81E.80802@unixcluster.dk>

Terry Reedy wrote:
> jkv wrote:
>> Hi,
>>
>> Are there any way to change the EOL character for 
>> sys.stdin.readline() and raw_input()?
>> My problem is that i cannot rely on that the clients connection to my 
>> application will end all lines with \n or \r\n. Sometimes they will 
>> use \r\000 as EOL.
>>
>> Example from my code:
>>
>>    sys.stdout.write('Password: ');
>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>    password = raw_input()
>>
>> If the client sends 'qwerty\r\n' everything is fine and the password 
>> get stored in the variable. But sometimes, depending on how broken 
>> the telnet client are, the client will send 'qwerty\r\000' instead 
>> and then my application will hang at 'password = raw_input()' forever.
>
> Can you put that in a separate thread with timeout?
I guess i could - wouldn't know how thou, just getting started in python.

Is there any way i can read stdin character by character? In C i would 
loop over 'ch = getch();' and in each iteration push the character to 
the password variable unless  ch equals to \r.
Anyway to do something like this in python?

Regards,
jkv



From exarkun at divmod.com  Thu Feb 26 14:42:46 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 14:42:46 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
Message-ID: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>

On Thu, 26 Feb 2009 11:46:24 +0100, jkv <jkv at unixcluster.dk> wrote:
>Hi,
>
>Are there any way to change the EOL character for sys.stdin.readline() and 
>raw_input()?
>My problem is that i cannot rely on that the clients connection to my 
>application will end all lines with \n or \r\n. Sometimes they will use 
>\r\000 as EOL.
>
>Example from my code:
>
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
>
>If the client sends 'qwerty\r\n' everything is fine and the password get 
>stored in the variable. But sometimes, depending on how broken the telnet 
>client are, the client will send 'qwerty\r\000' instead and then my 
>application will hang at 'password = raw_input()' forever.
>
>Any suggestions?

It sounds like you might want to use a real implementation of the telnet
protocol in your application.  Such an implementation would deal with the
fact that telnet encodes \r as \r\0 for you.

Twisted includes a telnet implementation, as well as facilities for reading
stdin asynchronously (which will let you avoid indefinite hangs).

Jean-Paul


From cosmo_general at yahoo.com  Thu Feb 26 15:19:07 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Thu, 26 Feb 2009 12:19:07 -0800 (PST)
Subject: How to parse form in client side?
Message-ID: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>

Hi Folks,

cgi module can easily acquire the all fields of data input from client
side, through a form. Then, a simple line of code:

form_dict = cgi.FieldStorage()

grabs all data into a dictionary form_dict. The rest becomes a piece
of cake by querying the form_dict. Nice!

However, it is done in the server side. Now I want to do the same in
the client side. first of all, I get the source code of a HTML form by
using urllib, from server, with code below:

html_source = urllib.urlopen(URL).read()

Then, I need to parse this html_source file, at client side. Is there
a module to handle this? Can somebody help? Thanks!


Muddy Coder


From clp2 at rebertia.com  Thu Feb 26 15:22:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 12:22:00 -0800
Subject: How to parse form in client side?
In-Reply-To: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
References: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902261222u5931dcb5p9ac17df09808578e@mail.gmail.com>

On Thu, Feb 26, 2009 at 12:19 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> cgi module can easily acquire the all fields of data input from client
> side, through a form. Then, a simple line of code:
>
> form_dict = cgi.FieldStorage()
>
> grabs all data into a dictionary form_dict. The rest becomes a piece
> of cake by querying the form_dict. Nice!
>
> However, it is done in the server side. Now I want to do the same in
> the client side. first of all, I get the source code of a HTML form by
> using urllib, from server, with code below:
>
> html_source = urllib.urlopen(URL).read()
>
> Then, I need to parse this html_source file, at client side. Is there
> a module to handle this? Can somebody help? Thanks!

http://wwwsearch.sourceforge.net/ClientForm/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gnewsg at gmail.com  Thu Feb 26 15:27:26 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 26 Feb 2009 12:27:26 -0800 (PST)
Subject: How can I know when a sub-process is effectively initialized?
Message-ID: <375e4766-de16-4afc-a082-a03317c179f0@r4g2000yqa.googlegroups.com>

Hi,
I'm working on a Python module called psutil [1] for reading process
information in a cross-platform way.
I'm having a problem with psutil test suite.
Almost all the test cases we implemented so far look like this:

def test_foo(self):
    test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
stderr=DEVNULL)
    time.sleep(0.1)  # XXX: provisional, give some time the sub
process to initialize
    p = psutil.Process(test_process.pid)
    # start test here
    ...

As you can see we put a time.sleep(0.1) call after subprocess.Popen()
as a provisional workaround to let the sub process initialize
properly.
We're searching for some kind of way to know when the child process is
properly initialized so that we can actually start testing cases
without worries.
Does someone has an idea how could we do that?

[1] http://code.google.com/p/psutil/

Thanks a lot in advance,



--- Giampaolo
[1] http://code.google.com/p/pyftpdlib


From tjreedy at udel.edu  Thu Feb 26 15:27:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 15:27:38 -0500
Subject: Delete all items in the list
In-Reply-To: <go6nsb$4an$2@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>	<go6mkl$q8j$3@ger.gmane.org>
	<go6nsb$4an$2@ger.gmane.org>
Message-ID: <go6tvm$sfs$1@ger.gmane.org>

Steve Holden wrote:
> Terry Reedy wrote:
>> Gabriel Genellina wrote:
>>
>>>> L = filter('a'.__ne__,L)
>>> And this is probably the fastest. But not all types define __ne__ 
>> In Py3, all classes inherit .__ne__ from 'object'.
>>
> Isn't that inherited method just an identity comparison?

Yes.  And so is, by default, the snipped slower proposed alternative of 
lambda x: a!= x.

> However in this particular case the main point is that str *does*
> implement __ne__. So as long as that built-in method doesn't call the
> other operand's __ne__ there should be no problem.
> 
> regards
>  Steve



From steve at holdenweb.com  Thu Feb 26 15:31:06 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 15:31:06 -0500
Subject: Delete all items in the list
In-Reply-To: <go6tvm$sfs$1@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>	<go6mkl$q8j$3@ger.gmane.org>	<go6nsb$4an$2@ger.gmane.org>
	<go6tvm$sfs$1@ger.gmane.org>
Message-ID: <go6u7b$sjs$1@ger.gmane.org>

Terry Reedy wrote:
> Steve Holden wrote:
>> Terry Reedy wrote:
>>> Gabriel Genellina wrote:
>>>
>>>>> L = filter('a'.__ne__,L)
>>>> And this is probably the fastest. But not all types define __ne__ 
>>> In Py3, all classes inherit .__ne__ from 'object'.
>>>
>> Isn't that inherited method just an identity comparison?
> 
> Yes.  And so is, by default, the snipped slower proposed alternative of
> lambda x: a!= x.
> 
But shouldn't that have been lambda x: 'a' != x, which would have
invoked the string (3.0, Unicode) comparison method?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From nick at craig-wood.com  Thu Feb 26 15:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 26 Feb 2009 14:31:53 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
	<33411bf0-396a-4aef-83ad-4d4e68b26050@l22g2000vba.googlegroups.com>
Message-ID: <slrngqdt6s.3jd.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> > So do you want to embed python into your code?
> >
> > I'm still not clear what you are trying to achieve with python, though
> > I have a better idea what SLAG is now!
> 
>  Actually no, I want to EXTEND python using the lower levels of S-lang
>  screen modules.

Ah!

>  My Modules are written in C and are a frame work for building pull-
>  down menus and data entry screens.
> 
>  Very nice for writing business applications. Think along the lines
>  of FoxPro and/or the "Screen" section in Cobol and you have a
>  pretty good idea of what i have done.

You've got several choices.

1) Write a python module in C which interfaces with your C code.

This is the traditional way, but it is quite time consuming and easy
to slip up with reference counting.  You need to learn the python API
to use this.

Will require compiling by your users (not a big hurdle if you make a
setup.py).

2) Write an interface with ctypes

If your C code presents itself as a shared object (dll/so) then this
is a really nice way of using it.  You don't have to write any C code
or worry about any reference counting - you do it all in python.

You'll need to learn how ctypes maps python onto C, but as you know C
well you won't find this difficult.

ctypes is included with python now.

3) Use Cython

Cython is a sort of hybrid C and python which can be used for
interfacing with C code.

This requires learning exactly what you can and can't do in Cython (it
is almost python but not quite).

This will require your users to install Cython and compile stuff.
Again easy if you make a setup.py but more stuff to install.

4) Use Swig

A solid approach, quicker than 1) but not as quick as 2) or 3)

This will require your users to install swig and a compiler.

...

My prefered approach is 2) ctypes at the moment.  I have used all 4 of
the above approaches in the past though!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From m.shanmugarajan at gmail.com  Thu Feb 26 15:37:33 2009
From: m.shanmugarajan at gmail.com (Shanmuga Rajan)
Date: Thu, 26 Feb 2009 15:37:33 -0500
Subject: removing duplication from a huge list.
Message-ID: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>

Hi


I have a list of Records with some details.(more than 15 million records)
with duplication

I need to iterate through every record and need to eliminate duplicate
records.

Currently i am using a script like this.


counted_recs = [ ]
x = some_fun()  #  will return a generator, this generator is the source of
list. because i dont want to carry entire 15 million records in a list(need
more 1 gb of memory)

for rec in x:
    if rec[0] not in counted_recs:
        #some logics goes here...
        counted_recs.append(rec[0])        # i need to have rec[0]=name
alone from record.


but i am sure this is not a optimized way to do.
so i came up with a different solution. but i am not confident in that
solution too

here my second solution.

counted_recs = []

x = some_fun()

#x = [ rec[0] for rec in x]

for rec in x:
    if counted_recs.count(rec[0]) > 0 :
        # some logic goes here
        counted_recs.append(rec[0])


which one is better?  if any one suggests better solution then i will be
very happy.

Advance thanks for any help.


Shan
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From gagsl-py2 at yahoo.com.ar  Thu Feb 26 15:47:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 18:47:13 -0200
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
Message-ID: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 16:17:42 -0200, Maxim Khitrov <mkhitrov at gmail.com>  
escribi?:

> I'm looking for a function in the standard library or pywin32 package
> that will block until a certain condition is met or it is interrupted
> by Ctrl-C. For example, time.sleep() would have been perfect for my
> needs if thread.interrupt_main() could interrupt the call from another
> thread in the same way that Ctrl-C does. Unfortunately, that is not
> the case.
>
> Another thing I tried was creating a pipe with os.pipe() and issuing a
> read call on it. The event to exit was a single byte written to the
> other end of the pipe, but Ctrl-C could not interrupt the read call.
> The threading.Event class does not work for me, because it uses short
> sleep intervals for timed waits. I need the reaction to be as close to
> instant as possible, something like this will not do:
>
> while not <some condition is met>:
>    sleep(0.01)
>
> I actually replaced threading.Event with my own version that uses
> native Windows events, and waits on those also cannot be interrupted
> by Ctrl-C. I'm trying to achieve the same effect as that while loop
> and I don't care what the condition to exit is, but the loop needs to
> exit as soon as the condition is met without waiting for up to X
> additional milliseconds. Any ideas?

You may try MsgWaitForMultipleObjects - send a message to the main thread  
 from the other thread.
An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,  
but I've never actually tried in Python.

-- 
Gabriel Genellina



From exarkun at divmod.com  Thu Feb 26 15:59:38 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 15:59:38 -0500
Subject: How can I know when a sub-process is effectively initialized?
In-Reply-To: <375e4766-de16-4afc-a082-a03317c179f0@r4g2000yqa.googlegroups.com>
Message-ID: <20090226205938.12853.1013496395.divmod.quotient.14307@henry.divmod.com>

On Thu, 26 Feb 2009 12:27:26 -0800 (PST), Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>Hi,
>I'm working on a Python module called psutil [1] for reading process
>information in a cross-platform way.
>I'm having a problem with psutil test suite.
>Almost all the test cases we implemented so far look like this:
>
>def test_foo(self):
>    test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
>stderr=DEVNULL)
>    time.sleep(0.1)  # XXX: provisional, give some time the sub
>process to initialize
>    p = psutil.Process(test_process.pid)
>    # start test here
>    ...
>
>As you can see we put a time.sleep(0.1) call after subprocess.Popen()
>as a provisional workaround to let the sub process initialize
>properly.
>We're searching for some kind of way to know when the child process is
>properly initialized so that we can actually start testing cases
>without worries.
>Does someone has an idea how could we do that?

Hi Giampaolo,

"Properly initialized" is application specific.  Generally, what you want
to do is have the child process tell you when it's ready.  A common way
to do this is for the child to write some bytes to a file descriptor the
parent is monitoring when it is ready.  The parent then just waits for
those bytes.  It looks like you entirely control the child in this case,
so that should be possible here.

Alternatively, maybe by "properly initialized" you mean something very
specific about how subprocess.Popen creates processes.  If so, can you
elaborate a bit?

Jean-Paul


From mh at pixar.com  Thu Feb 26 16:29:19 2009
From: mh at pixar.com (mh at pixar.com)
Date: Thu, 26 Feb 2009 21:29:19 GMT
Subject: best way to parse a function-call-like string?
Message-ID: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>

I have some strings that look like function calls, e.g.

	"junkpkg.f1"
	"junkpkg.f1()"
	"junkpkg.f1('aaa')"
	"junkpkg.f1('aaa','bbb')"
	"junkpkg.f1('aaa','bbb','ccc')"
	"junkpkg.f1('aaa','with,comma')"

and I need to split them into the function name and list of parms, e.g.

	"junkpkg.f1", []
	"junkpkg.f1", []
	"junkpkg.f1", ['aaa']
	"junkpkg.f1", ['aaa','bbb']
	"junkpkg.f1", ['aaa','bbb','ccc']
	"junkpkg.f1", ['aaa','with,comma']

What's the best way to do this?  I would be interested in either
of two approaches:

   - a "real" way which comprehensively

   - a quick-and-dirty way which handles most cases, so that I
     can get my coding partner running quickly while I do the
     "real" way.  will the csv module do the right thing for
     the parm list?

Many TIA!!
Mark




-- 
Mark Harrison
Pixar Animation Studios


From hniksic at xemacs.org  Thu Feb 26 16:38:19 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 26 Feb 2009 22:38:19 +0100
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
Message-ID: <871vtk7ub8.fsf@mulj.homelinux.net>

Raymond Hettinger <python at rcn.com> writes:

> Here's a proposed implementation for Py2.7 and Py3.1:
>
>     http://code.activestate.com/recipes/576669/

    Several methods like __contains__() and __getitem__() are not
    overridden, so their performance is just as fast as a regular
    dictionary.

    Methods like __setitem__ and __delitem__ are overridden but have a
    fast path depending on whether or not the key already exists.

It seems that __delitem__ of an existing key is O(n), whereas it's
amortized constant time for dicts.  (__setitem__ is constant time for
both.)  Is there a way to avoid this?

If not, it should probably be documented, since it differs from dict.


From tim.wintle at teamrubber.com  Thu Feb 26 16:39:09 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 21:39:09 +0000
Subject: best way to parse a function-call-like string?
In-Reply-To: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <1235684349.4128.14.camel@tim-laptop>

On Thu, 2009-02-26 at 21:29 +0000, mh at pixar.com wrote:
> I have some strings that look like function calls, e.g.
> 
> "junkpkg.f1"
> "junkpkg.f1()"
> "junkpkg.f1('aaa')"
> "junkpkg.f1('aaa','bbb')"
> "junkpkg.f1('aaa','bbb','ccc')"
> "junkpkg.f1('aaa','with,comma')"
> 
> and I need to split them into the function name and list of parms,
> e.g.
> 
> "junkpkg.f1", []
> "junkpkg.f1", []
> "junkpkg.f1", ['aaa']
> "junkpkg.f1", ['aaa','bbb']
> "junkpkg.f1", ['aaa','bbb','ccc']
> "junkpkg.f1", ['aaa','with,comma']
> 

quick and dirty

for s in string_list:
    if "(" in s and s[-1] == ")":
      parts = s.split("(")
      fn, args = s[0],s[1][:-1].split(",")


Tim Wintle



From mh at pixar.com  Thu Feb 26 16:42:06 2009
From: mh at pixar.com (mh at pixar.com)
Date: Thu, 26 Feb 2009 21:42:06 GMT
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
	<mailman.850.1235684625.11746.python-list@python.org>
Message-ID: <O0Epl.13712$D32.3728@flpi146.ffdc.sbc.com>

Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-26 15:29, mh at pixar.com wrote:
> Use the compiler module to generate an AST and walk it. That's the real 
> way. For me, that would also be the quick way because I am familiar with 
> the API, but it may take you a little bit of time to get used to it.

ah, that's just what I was hoping for...
in the meantime, here's my quick and dirty:


import csv

def fakeparse(s):

    print "======="
    argl=[]
    ix=s.find('(')
    if ix == -1:
        func=s
        argl=[]
    else:
        func=s[0:ix]
        argstr=s[ix+1:]
        argstr=argstr[:argstr.rfind(')')]
        print argstr
        for argl in csv.reader([argstr], quotechar="'"):
            pass

    print s
    print func
    print argl

    return func,argl


print fakeparse("junkpkg.f1")
print fakeparse("junkpkg.f1()")
print fakeparse("junkpkg.f1('aaa')")
print fakeparse("junkpkg.f1('aaa','bbb')")
print fakeparse("junkpkg.f1('aaa','bbb','ccc')")
print fakeparse("junkpkg.f1('aaa','xx,yy')")


-- 
Mark Harrison
Pixar Animation Studios


From tim.wintle at teamrubber.com  Thu Feb 26 16:42:43 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 21:42:43 +0000
Subject: best way to parse a function-call-like string?
In-Reply-To: <1235684349.4128.14.camel@tim-laptop>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
	<1235684349.4128.14.camel@tim-laptop>
Message-ID: <1235684563.4128.19.camel@tim-laptop>

On Thu, 2009-02-26 at 21:39 +0000, Tim Wintle wrote:
> On Thu, 2009-02-26 at 21:29 +0000, mh at pixar.com wrote:
> > "junkpkg.f1", ['aaa','with,comma']
oops - missed this one, ignore my last reply.






From robert.kern at gmail.com  Thu Feb 26 16:43:32 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 26 Feb 2009 15:43:32 -0600
Subject: best way to parse a function-call-like string?
In-Reply-To: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <go72e5$cun$1@ger.gmane.org>

On 2009-02-26 15:29, mh at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> 	"junkpkg.f1"
> 	"junkpkg.f1()"
> 	"junkpkg.f1('aaa')"
> 	"junkpkg.f1('aaa','bbb')"
> 	"junkpkg.f1('aaa','bbb','ccc')"
> 	"junkpkg.f1('aaa','with,comma')"
>
> and I need to split them into the function name and list of parms, e.g.
>
> 	"junkpkg.f1", []
> 	"junkpkg.f1", []
> 	"junkpkg.f1", ['aaa']
> 	"junkpkg.f1", ['aaa','bbb']
> 	"junkpkg.f1", ['aaa','bbb','ccc']
> 	"junkpkg.f1", ['aaa','with,comma']
>
> What's the best way to do this?  I would be interested in either
> of two approaches:
>
>     - a "real" way which comprehensively
>
>     - a quick-and-dirty way which handles most cases, so that I
>       can get my coding partner running quickly while I do the
>       "real" way.  will the csv module do the right thing for
>       the parm list?

Use the compiler module to generate an AST and walk it. That's the real 
way. For me, that would also be the quick way because I am familiar with 
the API, but it may take you a little bit of time to get used to it.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though 
it had
  an underlying truth."
   -- Umberto Eco



From JesseAldridge at gmail.com  Thu Feb 26 16:48:08 2009
From: JesseAldridge at gmail.com (Jesse Aldridge)
Date: Thu, 26 Feb 2009 13:48:08 -0800 (PST)
Subject: Can someone explain this behavior to me?
Message-ID: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>

I have one module called foo.py
---------------------
class Foo:
    foo = None

def get_foo():
    return Foo.foo

if __name__ == "__main__":
    import bar
    Foo.foo = "foo"
    bar.go()
---------------------
And another one called bar.py
---------------------
import foo

def go():
    assert foo.get_foo() == "foo"
----------------------
When I run foo.py, the assertion in bar.py fails.  Why?


From sjmachin at lexicon.net  Thu Feb 26 17:02:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 26 Feb 2009 14:02:53 -0800 (PST)
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <41d63877-0166-4b82-872e-3ddbf6d35dff@d2g2000pra.googlegroups.com>

On Feb 27, 8:29?am, m... at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> ? ? ? ? "junkpkg.f1"
> ? ? ? ? "junkpkg.f1()"
> ? ? ? ? "junkpkg.f1('aaa')"
> ? ? ? ? "junkpkg.f1('aaa','bbb')"
> ? ? ? ? "junkpkg.f1('aaa','bbb','ccc')"
> ? ? ? ? "junkpkg.f1('aaa','with,comma')"

Examples are better than no examples, but a grammar would be a great
help. What about
   "junkpkg.f1('aaa','with)parenthesis')"
   "junkpkg.f1('aaa','with''ONEapostrophe')"

>
> and I need to split them into the function name and list of parms, e.g.
>
> ? ? ? ? "junkpkg.f1", []
> ? ? ? ? "junkpkg.f1", []
> ? ? ? ? "junkpkg.f1", ['aaa']
> ? ? ? ? "junkpkg.f1", ['aaa','bbb']
> ? ? ? ? "junkpkg.f1", ['aaa','bbb','ccc']
> ? ? ? ? "junkpkg.f1", ['aaa','with,comma']
>
> What's the best way to do this? ?I would be interested in either
> of two approaches:
>
> ? ?- a "real" way which comprehensively
>
> ? ?- a quick-and-dirty way which handles most cases, so that I
> ? ? ?can get my coding partner running quickly while I do the
> ? ? ?"real" way. ?will the csv module do the right thing for
> ? ? ?the parm list?

It should, for "most cases". Any reason you can't try it out for
yourself?

It appears to "work" in the sense that if you have isolated a string
containing the parameters, the csv module can be used to "parse" it:

| Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
| Type "help", "copyright", "credits" or "license" for more
information.
| >>> import csv, cStringIO
| >>> argstring = "'aaa','with,comma'"
| >>> csvargs = lambda s: list(csv.reader(cStringIO.StringIO(s),
quotechar="'"))
| >>> csvargs(argstring)
| [['aaa', 'with,comma']]
| >>> csvargs("'aaa','with''ONEapostrophe'")
| [['aaa', "with'ONEapostrophe"]]
| >>>

HTH
John


From clp2 at rebertia.com  Thu Feb 26 17:13:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 14:13:29 -0800
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>

On Thu, Feb 26, 2009 at 1:48 PM, Jesse Aldridge <JesseAldridge at gmail.com> wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
> ? ?foo = None
>
> def get_foo():
> ? ?return Foo.foo
>
> if __name__ == "__main__":
> ? ?import bar
> ? ?Foo.foo = "foo"
> ? ?bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
>
> def go():
> ? ?assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails. ?Why?

Not sure, but circular imports are *evil* anyway, so I'd suggest you
just rewrite the code to avoid doing any circular imports in the first
place.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gschells at hotmail.com  Thu Feb 26 17:23:27 2009
From: gschells at hotmail.com (Gary Schells)
Date: Thu, 26 Feb 2009 17:23:27 -0500
Subject: PythonWin -vs- Idle
Message-ID: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>



Hello,

Python newbie here.  I am working with Python and geoprocessing in
ArcGIS.  I'm taking a training course online and the exercise I'm
working on makes mention of using PythonWin instead of Idle.



I am using version 2.5 and have not been able to locate PythonWin.  The
download just includes Idle for the environment.  Can anyone point me
in the right direction to download the PythonWin piece of this puzzle?



Thank you

_________________________________________________________________
It?s the same Hotmail?. If by ?same? you mean up to 70% faster. 
http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_HM_AE_Same_022009
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From mabdelkader at gmail.com  Thu Feb 26 17:25:38 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 26 Feb 2009 17:25:38 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
	<50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>
Message-ID: <148918f0902261425g50a31279w9b42f55b65886fd5@mail.gmail.com>

I'm pretty sure that Foo is getting replaced once you import Foo, why not
pass the Foo() object to bar's go? I'm sure there are other ways, but yes,
circular imports are indeed evil.


On Thu, Feb 26, 2009 at 5:13 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Thu, Feb 26, 2009 at 1:48 PM, Jesse Aldridge <JesseAldridge at gmail.com>
> wrote:
> > I have one module called foo.py
> > ---------------------
> > class Foo:
> >    foo = None
> >
> > def get_foo():
> >    return Foo.foo
> >
> > if __name__ == "__main__":
> >    import bar
> >    Foo.foo = "foo"
> >    bar.go()
> > ---------------------
> > And another one called bar.py
> > ---------------------
> > import foo
> >
> > def go():
> >    assert foo.get_foo() == "foo"
> > ----------------------
> > When I run foo.py, the assertion in bar.py fails.  Why?
>
> Not sure, but circular imports are *evil* anyway, so I'd suggest you
> just rewrite the code to avoid doing any circular imports in the first
> place.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jkv at unixcluster.dk  Thu Feb 26 17:33:39 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 23:33:39 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>
References: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>
Message-ID: <49A718C3.2020002@unixcluster.dk>

Jean-Paul Calderone wrote:
>    sys.stdout.write('Password: ');
>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>    password = raw_input()
>>
>> If the client sends 'qwerty\r\n' everything is fine and the password 
>> get stored in the variable. But sometimes, depending on how broken 
>> the telnet client are, the client will send 'qwerty\r\000' instead 
>> and then my application will hang at 'password = raw_input()' forever.
>>
>> Any suggestions?
>
> It sounds like you might want to use a real implementation of the telnet
> protocol in your application.  Such an implementation would deal with the
> fact that telnet encodes \r as \r\0 for you.
>
> Twisted includes a telnet implementation, as well as facilities for 
> reading
> stdin asynchronously (which will let you avoid indefinite hangs).
I am running this script inside a wrapper (honeyd), so i cant really use 
twisted since i don't have raw network access - i only got stdout, stdin 
and stderr to play with.

But i found a solution, posting it here for the archives:

password = ""
while 1:
   c = sys.stdin.read(1)
   if c == '\r' or c == '\n':
       break
   password = password + c



Regards,
jkv


From Lie.1296 at gmail.com  Thu Feb 26 17:39:12 2009
From: Lie.1296 at gmail.com (Lie)
Date: Thu, 26 Feb 2009 14:39:12 -0800 (PST)
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org> 
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<mailman.751.1235580620.11746.python-list@python.org>
Message-ID: <1dca1b53-dbc9-4b36-b4b8-18ee657b0438@v18g2000pro.googlegroups.com>

On Feb 26, 3:50?am, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <ma... at sferacarta.com> wrote:
>
> > Yes it's in Python alright, but it's not Pythonese yet. You could try
> > avoiding the getter/setter stuff, and camelCase method naming, things like
> > that, for a start.
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).

I just want to add the note that since you're planning to move the
code to Java, although you should avoid getter and setter in python
(since it's redundant because of property), you should use getter and
setter in the Java version because it is the best practice in Java.

> The camel-case thing I get -- I use that and this_type quite a bit,
> probably because of the inconsistency of the languages I use
> regularly, and standards at work and conventions in my hobby
> programming.



From clp2 at rebertia.com  Thu Feb 26 17:40:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 14:40:50 -0800
Subject: PythonWin -vs- Idle
In-Reply-To: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
Message-ID: <50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>

On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gschells at hotmail.com> wrote:
>
> Hello,
> Python newbie here.? I am working with Python and geoprocessing in ArcGIS.
> I'm taking a training course online and the exercise I'm working on makes
> mention of using PythonWin instead of Idle.
>
> I am using version 2.5 and have not been able to locate PythonWin.? The
> download just includes Idle for the environment.? Can anyone point me in the
> right direction to download the PythonWin piece of this puzzle?

Seems to be included in http://sourceforge.net/projects/pywin32/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sjmachin at lexicon.net  Thu Feb 26 17:44:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 26 Feb 2009 14:44:40 -0800 (PST)
Subject: Can someone explain this behavior to me?
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <95d96ea7-1e3d-425e-be99-655a68ffaeca@l33g2000pri.googlegroups.com>

On Feb 27, 8:48?am, Jesse Aldridge <JesseAldri... at gmail.com> wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
> ? ? foo = None
>
> def get_foo():
> ? ? return Foo.foo
>
> if __name__ == "__main__":
> ? ? import bar
> ? ? Foo.foo = "foo"
> ? ? bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
>
> def go():
> ? ? assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails. ?Why?

AFAICT from that convoluted mess, because there are two rabbit holes,
__main__.Foo.foo and foo.Foo.foo, and you poked "foo" down the wrong
one. In any case the other one is not the right one -- as you have
already been advised, circular imports are evil.


From exarkun at divmod.com  Thu Feb 26 17:50:38 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 17:50:38 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A7186D.8050609@unixcluster.dk>
Message-ID: <20090226225038.12853.1517515098.divmod.quotient.14356@henry.divmod.com>

On Thu, 26 Feb 2009 23:32:13 +0100, jkv <jkv at unixcluster.dk> wrote:
>Jean-Paul Calderone wrote:
>>    sys.stdout.write('Password: ');
>>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>>    password = raw_input()
>>>
>>>If the client sends 'qwerty\r\n' everything is fine and the password get 
>>>stored in the variable. But sometimes, depending on how broken the telnet 
>>>client are, the client will send 'qwerty\r\000' instead and then my 
>>>application will hang at 'password = raw_input()' forever.
>>>
>>>Any suggestions?
>>
>>It sounds like you might want to use a real implementation of the telnet
>>protocol in your application.  Such an implementation would deal with the
>>fact that telnet encodes \r as \r\0 for you.
>>
>>Twisted includes a telnet implementation, as well as facilities for reading
>>stdin asynchronously (which will let you avoid indefinite hangs).
>I running this script inside a wrapper (honeyd), so i cant really use 
>twisted since i dont have raw network access - i only got stdout, stdin and 
>stderr to play with.
>
>But i found a solution, posting it here for the archives:
>
>password = ""
>while 1:
>    c = sys.stdin.read(1)
>    if c == '\r' or c == '\n':
>        break
>    password = password + c
>

Glad you figured something out.  Just for the record, you can use Twisted
to write applications that interact with stdio, so the fact that you're
using honeyd doesn't prevent you from using Twisted.

Jean-Paul


From python at rcn.com  Thu Feb 26 17:54:53 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 14:54:53 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<mailman.832.1235667533.11746.python-list@python.org>
Message-ID: <6f96323f-6263-4306-872c-544c76ec231f@40g2000prx.googlegroups.com>

[Benjamin Peterson]
> Why not just inherit from collections.MutableMapping?

It makes the recipe shorter to inherit some methods from dict.  Also,
subclassing from dict gives a speedup for __getitem__(), __len__(),
and get().


From ptmcg at austin.rr.com  Thu Feb 26 17:56:17 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 26 Feb 2009 14:56:17 -0800 (PST)
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <64326bcf-0968-4589-bfd0-65a5c452e962@q9g2000yqc.googlegroups.com>

On Feb 26, 3:29?pm, m... at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> ? ? ? ? "junkpkg.f1"
> ? ? ? ? "junkpkg.f1()"
> ? ? ? ? "junkpkg.f1('aaa')"
> ? ? ? ? "junkpkg.f1('aaa','bbb')"
> ? ? ? ? "junkpkg.f1('aaa','bbb','ccc')"
> ? ? ? ? "junkpkg.f1('aaa','with,comma')"
>
> and I need to split them into the function name and list of parms, e.g.
>

Pyparsing will easily carve up these function declarations, and will
give you some room for easy extension once your parsing job starts to
grow to include other variants (like arguments other than quoted
strings, for instance).  Using the results names ("name" and "args"),
then parsed fields are easy to get at after the parsing is done.

-- Paul

from pyparsing import Word, alphas, alphanums, delimitedList, \
    Optional, Literal, Suppress, quotedString

LPAR,RPAR = map(Suppress,"()")
ident = Word(alphas+"_", alphanums+"_")
fnName = delimitedList(ident,".",combine=True)
arg = quotedString
fnCall = fnName("name") + Optional(LPAR +
        Optional(delimitedList(arg)) + RPAR, default=[])("args")

tests = """junkpkg.f1
        junkpkg.f1()
        junkpkg.f1('aaa')
        junkpkg.f1('aaa','bbb')
        junkpkg.f1('aaa','bbb','ccc')
        junkpkg.f1('aaa','with,comma')""".splitlines()

for t in tests:
    fn = fnCall.parseString(t)
    print fn.name
    for a in fn.args:
        print "-",a
    print

Prints:

junkpkg.f1

junkpkg.f1

junkpkg.f1
- 'aaa'

junkpkg.f1
- 'aaa'
- 'bbb'

junkpkg.f1
- 'aaa'
- 'bbb'
- 'ccc'

junkpkg.f1
- 'aaa'
- 'with,comma'


From python at rcn.com  Thu Feb 26 17:57:26 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 14:57:26 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
Message-ID: <da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>

[Hrvoje Niksic]
> It seems that __delitem__ of an existing key is O(n), whereas it's
> amortized constant time for dicts. ?(__setitem__ is constant time for
> both.) ?Is there a way to avoid this?

I don't see any fast/clean way.  It's possible to tracking pending
deletions
and do them all at once but that's a bit messy and slow.


> If not, it should probably be documented, since it differs from dict.

That makes sense.


Raymond



From jgardner at jonathangardner.net  Thu Feb 26 18:10:20 2009
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Thu, 26 Feb 2009 15:10:20 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>

On Feb 20, 6:31?am, Trip Technician <luke.d... at gmail.com> wrote:
> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.


Actually, representing 33 has an even shorter answer: '33'

There is actually a really easy solution for this. What you are really
doing is finding the shortest path from point A (the expression '') to
another expression that evaluates to the target number.

>From each point, you can take steps that (a) add a digit to the end or
(b) add an operator---but only if it makes sense. Since operators
don't count, those steps don't add anything to the distance, while the
digits do.

What you do is you start walking the map from point A to some
mysterious point that evaluates to the result you want. Actually, you
send out walkers in all directions, and tell only the walkers that
have taken the fewest steps to take another step. Once a walker gets
to an expression with the result, you have your answer since he is the
first walker to get there. When a walker gets to an expression that
has already been visited, you can tell that walker to go home since
his path was no good. When a walker gets to an expression that
evaluates to a value you have already seen, that walker too should go
home since he has just found a longer path to the same result.

So you have a set of walkers, and each walker has the expression they
used to get to where they are and how many steps they took to get
there. You also have a set of values you have seen before and thus
values that if a walker finds you are no longer interested in.

For each iteration, you take each surviving walker and spawn a new
walker that takes a step in each possible direction. Then you check if
any of those walkers found the value you are looking for. If so,
you've found the answer. If they hit a value you've already seen, you
drop that walker from the set.

The only hanging point is parentheses. What you can do here is instead
of building a linear expression, build a tree expression that shows
the operations and the values they operate. It should be trivial to
calculate all the different new trees that are one digit longer than a
previous tree.


From http  Thu Feb 26 18:26:05 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 15:26:05 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
Message-ID: <7xd4d4hjaq.fsf@ruckus.brouhaha.com>

Raymond Hettinger <python at rcn.com> writes:
> I don't see any fast/clean way.  It's possible to tracking pending
> deletions and do them all at once but that's a bit messy and slow.

What about using a second dictionary (indexed by the incrementing
counter) instead of a list to record the insertion order?  Then you
have O(1) deletion, and traversal takes an O(n log n) sorting
operation.


From python at rcn.com  Thu Feb 26 18:41:39 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 15:41:39 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
Message-ID: <6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>

[Paul Rubin]
> What about using a second dictionary (indexed by the incrementing
> counter) instead of a list to record the insertion order? ?Then you
> have O(1) deletion, and traversal takes an O(n log n) sorting
> operation.

My first attempt used exactly that approach and it works fine
though it does complicate the code quite a bit and slows down
all of the common operations by a constant factor.


Raymond


From python at rcn.com  Thu Feb 26 18:46:05 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 15:46:05 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
Message-ID: <60b78693-b5af-452c-8081-86ff75679e64@z6g2000pre.googlegroups.com>

> > What about using a second dictionary (indexed by the incrementing
> > counter) instead of a list to record the insertion order? ?Then you
> > have O(1) deletion, and traversal takes an O(n log n) sorting
> > operation.

> My first attempt used exactly that approach and it works fine
> though it does complicate the code quite a bit and slows down
> all of the common operations by a constant factor.

FWIW, here is the code for that approach.

--------------------------------------
from collections import MutableMapping

class OrderedDict(dict):

    def __init__(self, *args, **kwds):
        if len(args) > 1:
            raise TypeError('expected at 1 argument, got %d', len
(args))
        self.clear()
        self.update(*args, **kwds)

    def clear(self):
        self.__cached_sort = None
        self.__cnt = 0
        self.__order = {}
        dict.clear(self)

    def __setitem__(self, key, value):
        if key not in self:
            self.__cached_sort = None
            self.__cnt += 1
            self.__order[key] = self.__cnt
        dict.__setitem__(self, key, value)

    def __delitem__(self, key):
        if key in self:
            self.__cached_sort = None
            del self.__order[key]
        dict.__delitem__(self, key)

    def __sorted(self):
        # return keys in insertion order and cache the result
        if self.__cached_sort is None:
            self.__cached_sort = sorted(dict.keys(self),
                                        key=self.__order.__getitem__)
        return self.__cached_sort

    def __iter__(self):
        return iter(self.__sorted())

    def __reversed__(self):
        return iter(reversed(self.__sorted()))

    def popitem(self):
        # O(n) cost on the first pop and O(1) on successive pops
        if not self:
            raise KeyError
        key = self.__sorted().pop()
        del self.__order[key]
        value = dict.pop(self, key)
        return key, value

    # Methods with indirect access via the above methods

    setdefault = MutableMapping.setdefault
    update = MutableMapping.update
    pop = MutableMapping.pop
    keys = MutableMapping.keys
    values = MutableMapping.values
    items = MutableMapping.items

    def __repr__(self):
        return '{' + ', '.join(map('%r: %r'.__mod__, self.items())) +
'}'

    def copy(self):
        return self.__class__(self)

    @classmethod
    def fromkeys(cls, iterable, value=None):
        d = cls()
        for key in iterable:
            d[key] = value
        return d

    def __reduce__(self):
        # pickle an items list and any extra info in the instance dict
        items = list(self.items())
        inst_dict = vars(self).copy()
        for attr in vars(self.__class__):
            inst_dict.pop(attr, None)
        return (self.__class__, (items,), inst_dict)



From marduk at letterboxes.org  Thu Feb 26 18:58:18 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 26 Feb 2009 18:58:18 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <1235692698.31574.17.camel@centar.nbk>

On Thu, 2009-02-26 at 13:48 -0800, Jesse Aldridge wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
>     foo = None
> 
> def get_foo():
>     return Foo.foo
> 
> if __name__ == "__main__":
>     import bar
>     Foo.foo = "foo"
>     bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
> 
> def go():
>     assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails.  Why?

AFAICT you have 2 different "foo" modules here. The first foo is when
foo.py is called as a script, but it's not called "foo" it's called
"__main__" because it's called as a script.  When "bar" is imported, it
imports "foo", but this is different. Technically this is the first time
you are *importing* foo. It's actually loaded a second time with the
name "foo".

A more simplified version of it is this:

$ cat foo.py 
cat = 6
import bar
print '%s: %s.cat = %s' % (__file__, __name__, cat)

$ cat bar.py 
import foo
foo.cat = 7
print '%s: %s.cat = %s' % (__file__, foo.__name__, foo.cat)

$ python foo.py 
/home/marduk/test/foo.py: foo.cat = 6
/home/marduk/test/bar.py: foo.cat = 7
foo.py: __main__.cat = 6


OTOH:
$ python -c "import foo"
bar.py: foo.cat = 7
foo.py: foo.cat = 7

But, as others have said, this is confusing and should be avoided.

-a




From http  Thu Feb 26 19:05:35 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 16:05:35 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
Message-ID: <7x63iwg2wg.fsf@ruckus.brouhaha.com>

Raymond Hettinger <python at rcn.com> writes:
> > What about using a second dictionary 
> My first attempt used exactly that approach and it works fine
> though it does complicate the code quite a bit and slows down
> all of the common operations by a constant factor.

Ehh, I guess I'm not surprised at the slowdown and extra complexity
from the second dict.  Oh well.  If the module really turns out to be
really used a lot, another (messy) approach would be to write a C
extension that uses a doubly linked list some day.


From peter at www.pjb.com.au  Thu Feb 26 19:08:26 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 27 Feb 2009 00:08:26 GMT
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <slrngqebnr.3ru.peter@box8.pjb.com.au>

On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance: > L=['a', 'b', 'c', 'a']
> I want to delete all 'a's from the list.  > But if L.remove('a')
> only deletes the first 'a'.  How do you delete all 'a's?

L2 = list(set(L))

works for me...
Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From rhodri at wildebst.demon.co.uk  Thu Feb 26 19:10:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 27 Feb 2009 00:10:49 -0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>
Message-ID: <op.upzhgby4a8ncjz@gnudebst>

On Thu, 26 Feb 2009 23:10:20 -0000, Jonathan Gardner  
<jgardner at jonathangardner.net> wrote:

[snip]

> For each iteration, you take each surviving walker and spawn a new
> walker that takes a step in each possible direction. Then you check if
> any of those walkers found the value you are looking for. If so,
> you've found the answer. If they hit a value you've already seen, you
> drop that walker from the set.

This relies each value having the same set of next states no matter how
it's reached.  Unfortunately that's not true.  Consider what happens
when you walk on from (1+3) and (2+2):

One possible step from (1+3) is ((1/3)+3) == 3.33...  There's no single
step from (2+2) that can get you to the same place.

> The only hanging point is parentheses. What you can do here is instead
> of building a linear expression, build a tree expression that shows
> the operations and the values they operate. It should be trivial to
> calculate all the different new trees that are one digit longer than a
> previous tree.

Trivial yes, but the number of different new trees is large when you're
dealing with four digits, and ridiculous with 5.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Thu Feb 26 19:11:43 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 27 Feb 2009 00:11:43 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <49A72FBF.8080206@mrabarnett.plus.com>

Trip Technician wrote:
> anyone interested in looking at the following problem.
> 
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
> 
> 33 = 2^(3+2)+1 = 3^3+(3*2)
> 
> are both minimal, using 4 digits but
> 
> 33 = ((3+2)*2+1)*3
> 
> using 5 is not.
> 
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
> 
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> 
Here's my solution (I haven't bothered with making it efficient, BTW):

import operator

def solve(n):
     best_len = n
     best_expr = ""
     for x in range(1, n - 2):
         for y in range(x, n):
             for op, name in operator_list:
                 # Does this pair with this op give the right answer?
                 if op(x, y) == n:
                     lx, ex = numbers[x - 1]
                     ly, ey = numbers[y - 1]
                     # How many digits in total?
                     l = lx + ly
                     # Fewer digits than any previous attempts?
                     if l < best_len:
                         # Build the expression.
                         e = "(%s %s %s)" % (ex, name, ey)
                         best_len, best_expr = l, e
     return best_len, best_expr

operator_list = [(operator.add, "+"), (operator.sub, "-"), 
(operator.mul, "*"), (operator.div, "/"), (operator.pow, "^")]

# Tuples contain number of digits used and expression.
numbers = [(1, str(n)) for n in range(1, 4)]

for n in range(4, 34):
     numbers.append(solve(n))

for i, (l, e) in enumerate(numbers):
     print "%2d = %s" % (i + 1, e)



From clp2 at rebertia.com  Thu Feb 26 19:18:18 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:18:18 -0800
Subject: Delete all items in the list
In-Reply-To: <slrngqebnr.3ru.peter@box8.pjb.com.au>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au> wrote:
> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>> only deletes the first 'a'. ?How do you delete all 'a's?
>
> L2 = list(set(L))
>
> works for me...

A. That doesn't by itself remove all the 'a's, although it does remove
all but 1 'a'
B. That also removes all but one instance of *everything* in the list,
not just 'a'
C. That is lossy in that it completely loses the ordering of the original list

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From xahlee at gmail.com  Thu Feb 26 19:22:57 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 16:22:57 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com> 
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com> 
	<87k57dwmay.fsf@thinkpad.tsdh.de>
Message-ID: <ba7c96e0-f245-48ba-b5e4-5a38ee393344@k19g2000prh.googlegroups.com>

On Feb 26, 1:59 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Xah Lee <xah... at gmail.com> writes:
>
> Hi Xah,
>
> > is the suggestion of using modern standard shortcut set of X C V for
> > Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> > fancy Notepad clone?
>
> The functionality stays the same, but IMO it would confuse most users.
> Killing is not cutting, yanking is not pasting.  The whole concepts
> (kill-ring vs. simple copy&paste) are much different.

emacs's killing/yaning/kill-ring is basically the same idea as copy/
cut/paste-board.

Basically, emacs's pasteboard is just a extended version, such that it
keeps a record of previous copied contents. To users, effectively,
this means you can do paste-previous. That's all there is to it.

So, it's brainless to make emacs intuitive to people and adopt modern
UI standards. Basically, copy, cut, paste, is all the same, except in
emacs you have also paste previous.

> > Is fixing emacs's confusing undo and no redo, that is periodically
> > bitched by programer in blogs, considered making emacs into a Notepad
> > clone?
>
> It's much more advanced than the usual sequential undo, but I admit that
> it can get confusing sometimes.  So instead of dropping it I'd prefer to
> think about a better UI for it.
>
> > Is the suggestion for a statistics based ergonomic keybinding design
> > that are more faster to execute, easier on the fingers, and easier to
> > remember, mean it is turning emacs to a fancy notepad clone?
>
> Users use different commands and your bindings may be better for you on
> your querty keyboard, but I'm sure they're not on my German Dvorak Type
> II keyboard.

If your are on a special keyboard, you are on your own.

The ergonomic keybinding

? Ergoemacs Keybindings
  http://xahlee.org/emacs/ergonomic_emacs_keybinding.html

plays well with modern UI in Windows, Mac, Linux. It improves emacs
keybinding, but also support standard shortcut sets. In no way, it
loses any emacs advantage, while, it makes emacs compatible and
intuitive for vast majority of computer users, and improve efficiency
for those heavy touch typists and programers who are into the concept
of not leaving hands off the keyboard.

> > is the suggestion of getting rid of *scratch* buffer, and introduce a
> > command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> > anywhere, which lets user create multiple scratch buffers defaulting
> > to any mode and compatible for the rest of Linux's shortcuts, means it
> > is a fancy Microsoft Notepad?
>
> Such a easy key like C-n is much too valuable for such a rarely used
> command.  C-x b foobar RET is ok, isn't it?

This issues is discussed before in some hundred or 2 hundred thread in
2008.

the proposal in detail is here:

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

In no way it sacrifices emacs operational efficiency. The proposal is
careful thought out, so that in not only doesn't sacrifice emacs
operational efficient in any possible way, but improve it, yet
meanwhile makes it compatible with modern UI and intuitive to the
masses.

As for the Ctrl+n for New, it must be used in conjunction with the
ergonomic keybinding set mentioned above.

In the end, users can intuitive press Ctrl+n for creating a new file,
one or multiple of it, can be used as elisp *scratch*, and can be set
to default to any major mode, and can be saved by simply pressing Ctrl
+s, and it will ask if user wants to save instead of like emacs
*scratch* it risk losing data.

> > is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> > +, such that it reflects the lable on the keyboard, and Richard
> > Stallman agrees may be a good idea, means it's Notepad?
>
> Nope, but I'm not sure if it's possible for emacs to get the right key.
> Here, M is Alt, but Ctrl is indeed on the CapsLock key...
>
> And it makes key sequences much longer to write with little or no
> benefit.

What the fuck r u talking about?? Really, what the fuck are you
talking about? Give concrete, specific point please.

As for the CapsLock for Control, it's a industry myth. For detail,
see:

? Why You Should Not Swap Caps Lock With Control
  http://xahlee.org/emacs/swap_CapsLock_Ctrl.html

> > is the suggestion of supporting html mail, and interface to gmail out
> > of the box, means it's becoming Microsoft Notepad?
>
> Definitively not.  AFAIK Gnus can handle gmail accounts quite well.

Quite well my ass.

Thank you for your feedback. I think it would be nice if you do some
research on each particular issue. I can't spend my time to write
detailed things to teach every poster. And i often have to repeat
multiple times of the same issue. For example of a research, suppose
you find my claim about Ctrl and Caps Lock switch incredible. Then,
you can do research on this subject. Spending 1 hour on it, or days.
You can go to library to research ergonomics, or ask professors, or
try to hire experts for opinion, or set out experiments and test out
hypothesis etc. For example, you can write a program to statistically
log your keystroke, timing, etc. You can also set out key sequences
set, A, and B, and type them for one hour each, to see which is
causing your hand pain, etc.

The above is just beginner suggestions, on one particular example of
contention. On each and every issue, you can start a research.

Btw, you are prob a typical tech geekers, where you don't understand
nothing about research or social sciences. One short concrete advice i
can give about your situation when researching, is not based on your
views on slashdot, or the tech geeking blogs, or ?my emacs buddies did
this or that? type of thinking. Another concrete advices is that
whatever you did for the research, must cost you. If it came easily
without much cost, chances are, it's bullshit in your head. What dose
cost mean? Ok, it means your time, for example. Are you, willing, to
put aside say 10 hours of your time, on a issue mentioned here?
Alternatively, say, are you willing, to spend $100 USD for research on
particular issue we are debating here? For example, the money can be
used to pay professional services that does research for you. It's
probably peanuts and most such research services won't take. But it's
a start on thinking. You can spend it on someone who are known expert
for example. As a quick example, say you disbelieve one of my claim
about ergonomics, then you can spend the $100 USD to say ask some
known ergonomics expert to dinner or buy him beer, and ask about his
opinion.

I typed the above as fast as i can, just to give you some ideas. There
are too many issues, aspects, technical, social, concrete,
philosophical, that i can cover, and have written a lot in the past
years. I can't repeat them all here, and frankly i discussed only a
small part. But i hope you have some basic ideas about the issue.

Love & knowledge,

  Xah
? http://xahlee.org/

?


From peter at www.pjb.com.au  Thu Feb 26 19:26:30 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 27 Feb 2009 00:26:30 GMT
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<mailman.860.1235693901.11746.python-list@python.org>
Message-ID: <slrngqecpn.3uk.peter@box8.pjb.com.au>

On 2009-02-27, Chris Rebert <clp2 at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au> wrote:
>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>> How do you delete all 'a's?
>>
>> L2 = list(set(L))
>> works for me...
>
> A. That doesn't by itself remove all the 'a's, although it does
> remove all but 1 'a'
> B. That also removes all but one instance of *everything* in the
> list, not just 'a'
> C. That is lossy in that it completely loses the ordering of the
> original list

Sorry, points taken...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From gagsl-py2 at yahoo.com.ar  Thu Feb 26 19:27:26 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 22:27:26 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <op.upzh70oux6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 22:08:26 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list.  > But if L.remove('a')
>> only deletes the first 'a'.  How do you delete all 'a's?
>
> L2 = list(set(L))
>
> works for me...

For a very strange definition of "works":

py> L = ['a','b','c','a','j','b','z','b','a']
py> L2
['a', 'c', 'b', 'z', 'j']
py> L2 = list(set(L))
py> L2
['a', 'c', 'b', 'z', 'j']

I still see an 'a', there are things missing, and the order is totally  
lost.

-- 
Gabriel Genellina



From xahlee at gmail.com  Thu Feb 26 19:29:06 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 16:29:06 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com> 
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com> 
	<87k57dwmay.fsf@thinkpad.tsdh.de> <go5qmt$a7e$1@news.sap-ag.de> 
	<mailman.1849.1235647425.31690.help-gnu-emacs@gnu.org>
Message-ID: <4b5e5587-39c4-43a5-b28c-739eea8605af@d19g2000prh.googlegroups.com>

On Feb 26, 1:59 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Xah Lee <xah... at gmail.com> writes:
>
> Hi Xah,
>
> > is the suggestion of using modern standard shortcut set of X C V for
> > Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> > fancy Notepad clone?
>
> The functionality stays the same, but IMO it would confuse most users.
> Killing is not cutting, yanking is not pasting.  The whole concepts
> (kill-ring vs. simple copy&paste) are much different.

emacs's killing/yaning/kill-ring is basically the same idea as copy/
cut/paste-board.

Basically, emacs's pasteboard is just a extended version, such that it
keeps a record of previous copied contents. To users, effectively,
this means you can do paste-previous. That's all there is to it.

So, it's brainless to make emacs intuitive to people and adopt modern
UI standards. Basically, copy, cut, paste, is all the same, except in
emacs you have also paste previous.

> > Is fixing emacs's confusing undo and no redo, that is periodically
> > bitched by programer in blogs, considered making emacs into a Notepad
> > clone?
>
> It's much more advanced than the usual sequential undo, but I admit that
> it can get confusing sometimes.  So instead of dropping it I'd prefer to
> think about a better UI for it.
>
> > Is the suggestion for a statistics based ergonomic keybinding design
> > that are more faster to execute, easier on the fingers, and easier to
> > remember, mean it is turning emacs to a fancy notepad clone?
>
> Users use different commands and your bindings may be better for you on
> your querty keyboard, but I'm sure they're not on my German Dvorak Type
> II keyboard.

If your are on a special keyboard, you are on your own.

The ergonomic keybinding

? Ergoemacs Keybindings
  http://xahlee.org/emacs/ergonomic_emacs_keybinding.html

plays well with modern UI in Windows, Mac, Linux. It improves emacs
keybinding, but also support standard shortcut sets. In no way, it
loses any emacs advantage, while, it makes emacs compatible and
intuitive for vast majority of computer users, and improve efficiency
for those heavy touch typists and programers who are into the concept
of not leaving hands off the keyboard.

> > is the suggestion of getting rid of *scratch* buffer, and introduce a
> > command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> > anywhere, which lets user create multiple scratch buffers defaulting
> > to any mode and compatible for the rest of Linux's shortcuts, means it
> > is a fancy Microsoft Notepad?
>
> Such a easy key like C-n is much too valuable for such a rarely used
> command.  C-x b foobar RET is ok, isn't it?

This issues is discussed before in some hundred or 2 hundred thread in
2008.

the proposal in detail is here:

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

In no way it sacrifices emacs operational efficiency. The proposal is
careful thought out, so that in not only doesn't sacrifice emacs
operational efficient in any possible way, but improve it, yet
meanwhile makes it compatible with modern UI and intuitive to the
masses.

As for the Ctrl+n for New, it must be used in conjunction with the
ergonomic keybinding set mentioned above.

In the end, users can intuitive press Ctrl+n for creating a new file,
one or multiple of it, can be used as elisp *scratch*, and can be set
to default to any major mode, and can be saved by simply pressing Ctrl
+s, and it will ask if user wants to save instead of like emacs
*scratch* it risk losing data.

> > is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> > +, such that it reflects the lable on the keyboard, and Richard
> > Stallman agrees may be a good idea, means it's Notepad?
>
> Nope, but I'm not sure if it's possible for emacs to get the right key.
> Here, M is Alt, but Ctrl is indeed on the CapsLock key...
>
> And it makes key sequences much longer to write with little or no
> benefit.

What the fuck r u talking about?? Really, what the fuck are you
talking about? Give concrete, specific point please.

As for the CapsLock for Control, it's a industry myth. For detail,
see:

? Why You Should Not Swap Caps Lock With Control
  http://xahlee.org/emacs/swap_CapsLock_Ctrl.html

> > is the suggestion of supporting html mail, and interface to gmail out
> > of the box, means it's becoming Microsoft Notepad?
>
> Definitively not.  AFAIK Gnus can handle gmail accounts quite well.

Quite well my ass.

Thank you for your feedback. I think it would be nice if you do some
research on each particular issue. I can't spend my time to write
detailed things to teach every poster. And i often have to repeat
multiple times of the same issue. For example of a research, suppose
you find my claim about Ctrl and Caps Lock switch incredible. Then,
you can do research on this subject. Spending 1 hour on it, or days.
You can go to library to research ergonomics, or ask professors, or
try to hire experts for opinion, or set out experiments and test out
hypothesis etc. For example, you can write a program to statistically
log your keystroke, timing, etc. You can also set out key sequences
set, A, and B, and type them for one hour each, to see which is
causing your hand pain, etc.

The above is just beginner suggestions, on one particular example of
contention. On each and every issue, you can start a research.

Btw, you are prob a typical tech geekers, where you don't understand
nothing about research or social sciences. One short concrete advice i
can give about your situation when researching, is not based on your
views on slashdot, or the tech geeking blogs, or ?my emacs buddies did
this or that? type of thinking. Another concrete advices is that
whatever you did for the research, must cost you. If it came easily
without much cost, chances are, it's bullshit in your head. What dose
cost mean? Ok, it means your time, for example. Are you, willing, to
put aside say 10 hours of your time, on a issue mentioned here?
Alternatively, say, are you willing, to spend $100 USD for research on
particular issue we are debating here? For example, the money can be
used to pay professional services that does research for you. It's
probably peanuts and most such research services won't take. But it's
a start on thinking. You can spend it on someone who are known expert
for example. As a quick example, say you disbelieve one of my claim
about ergonomics, then you can spend the $100 USD to say ask some
known ergonomics expert to dinner or buy him beer, and ask about his
opinion.

I typed the above as fast as i can, just to give you some ideas. There
are too many issues, aspects, technical, social, concrete,
philosophical, that i can cover, and have written a lot in the past
years. I can't repeat them all here, and frankly i discussed only a
small part. But i hope you have some basic ideas about the issue.

Love & knowledge,

  Xah
? http://xahlee.org/

?

---------------------------


On Feb 26, 3:23 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Klaus Straubinger <KSN... at UseNet.ArcorNews.DE> writes:
>
> Hi Klaus,
>
> >> Reading HTML mail works nice, too (with emacs-w3m as helper).  A
> >> simple editor would be nice for some people, too.  But I guess that
> >> most current devs arent interested in writing one, cause in "the tech
> >> geekers" world mail is in text/plain.
>
> > In Emacs, there is Enriched Mode if you want formatted text. The info
> > file says
>
> > | "Enriched mode" is a minor mode for editing files that contain
> > | formatted text in WYSIWYG fashion, as in a word processor.  Currently,
> > | formatted text in Enriched mode can specify fonts, colors, underlining,
> > | margins, and types of filling and justification.  In the future, we plan
> > | to implement other formatting features as well.
> > |
> > | Enriched mode is a minor mode.  It is typically used in conjunction
> > | with Text mode, but you can also use it with other major modes such
> > | as Outline mode and Paragraph-Indent Text mode.
> > |
> > | Potentially, Emacs can store formatted text files in various file
> > | formats.  Currently, only one format is implemented: "text/enriched"
> > | format, which is defined by the MIME protocol.
>
> > One could write a converter to HTML if another format is desired.
>
> Yes, nice.  I guess that would be possible without too much effort.  So
> Xah, why not do it yourself?

Me?

I started a project in Jan, called emacs2010. Here:

http://code.google.com/p/emacs2010/

You see, one of the things tech geekers do, is to throw piss around.
So, instead of telling me something and something and something, for a
change, why don't you join my project and contribute code, for the
good of humanity? It's GPL, btw.

With your approval, i'll add you as a member.

  Xah
? http://xahlee.org/

?


From steve at holdenweb.com  Thu Feb 26 19:29:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:29:56 -0500
Subject: Delete all items in the list
In-Reply-To: <slrngqebnr.3ru.peter@box8.pjb.com.au>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <go7c79$bc6$1@ger.gmane.org>

Peter Billam wrote:
> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list.  > But if L.remove('a')
>> only deletes the first 'a'.  How do you delete all 'a's?
> 
> L2 = list(set(L))
> 
> works for me...

I have to wonder for what value of "works" this works.

The simplest problem is it doesn't remove all the "a"s.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lilhedges69 at yahoo.com  Thu Feb 26 19:32:40 2009
From: lilhedges69 at yahoo.com (Brett Hedges)
Date: Thu, 26 Feb 2009 16:32:40 -0800 (PST)
Subject: Using xreadlines
Message-ID: <910645.78379.qm@web30707.mail.mud.yahoo.com>


Hi,

I am using both xreadlines and files iterators for a script that I need to finish. I am iterating over the entire file but stopping to use xreadlines to grab certain lines as strings to process them.

My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.

My script has a loop that looks for a certain word then breaks the loop. But I need to go to the previous line before I break since the script uses that line (which gets processed). I'm sure there is an easier way to do this but since I am new to python and have spent a lot of time on this script I can't really go back and change a lot of things unless there is no possible way. Something like the example below.

f.open("text.txt",'r')
files = f.xreadlines()
Name = "Section 1"


for line in f:
   if Name in line:
     while x<20
       field = files.next()
         if "2.6" in field:
      *****files.previousline()*****
           break
     x=x+1




Thanks,

Brett 


      


From gagsl-py2 at yahoo.com.ar  Thu Feb 26 19:37:06 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 22:37:06 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>
Message-ID: <op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 22:18:18 -0200, Chris Rebert <clp2 at rebertia.com>  
escribi?:
> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au>  
> wrote:
>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>> Hi. This must be a simple command but I just can't find it in the
>>> Phthon manual. How do I delete all items with a certain condition from
>>> a list? For instance: > L=['a', 'b', 'c', 'a']
>>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>>> only deletes the first 'a'. ?How do you delete all 'a's?
>>
>> L2 = list(set(L))
>>
>> works for me...
>
> A. That doesn't by itself remove all the 'a's, although it does remove
> all but 1 'a'
> B. That also removes all but one instance of *everything* in the list,
> not just 'a'
> C. That is lossy in that it completely loses the ordering of the  
> original list

I said the very same things!
There are other issues too, like this only works with hashable objects,  
but I've chosen exactly the same remarks and exactly in the same order!  
What a coincidence...

-- 
Gabriel Genellina



From steve at holdenweb.com  Thu Feb 26 19:37:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:37:49 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <go7cm2$e1v$1@ger.gmane.org>

Jesse Aldridge wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
>     foo = None
> 
> def get_foo():
>     return Foo.foo
> 
> if __name__ == "__main__":
>     import bar
>     Foo.foo = "foo"
>     bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
> 
> def go():
>     assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails.  Why?

There are actually two get_foo()s, since foo.py is run (giving it the
name "__main__") and imported (giving it the name "foo"). You will
probably find that __main__.get_foo() == "foo".

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 19:39:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:39:50 -0800
Subject: Delete all items in the list
In-Reply-To: <op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>
	<op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <50697b2c0902261639w42574390jab7191bf1ca8ccc8@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:37 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Thu, 26 Feb 2009 22:18:18 -0200, Chris Rebert <clp2 at rebertia.com>
> escribi?:
>>
>> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au>
>> wrote:
>>>
>>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>>>
>>>> Hi. This must be a simple command but I just can't find it in the
>>>> Phthon manual. How do I delete all items with a certain condition from
>>>> a list? For instance: > L=['a', 'b', 'c', 'a']
>>>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>>>> only deletes the first 'a'. ?How do you delete all 'a's?
>>>
>>> L2 = list(set(L))
>>>
>>> works for me...
>>
>> A. That doesn't by itself remove all the 'a's, although it does remove
>> all but 1 'a'
>> B. That also removes all but one instance of *everything* in the list,
>> not just 'a'
>> C. That is lossy in that it completely loses the ordering of the original
>> list
>
> I said the very same things!
> There are other issues too, like this only works with hashable objects, but
> I've chosen exactly the same remarks and exactly in the same order! What a
> coincidence...

Indeed, USENET and mail<->news lags doth create interesting situations
sometimes.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Thu Feb 26 19:40:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:40:11 -0500
Subject: PythonWin -vs- Idle
In-Reply-To: <50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>
Message-ID: <go7cqg$e1v$2@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gschells at hotmail.com> wrote:
>> Hello,
>> Python newbie here.  I am working with Python and geoprocessing in ArcGIS.
>> I'm taking a training course online and the exercise I'm working on makes
>> mention of using PythonWin instead of Idle.
>>
>> I am using version 2.5 and have not been able to locate PythonWin.  The
>> download just includes Idle for the environment.  Can anyone point me in the
>> right direction to download the PythonWin piece of this puzzle?
> 
> Seems to be included in http://sourceforge.net/projects/pywin32/
> 
And it's well worth getting, since it's the recommended programming
environment for ArcGIS. IIRC it uses the COM server capabilities to
achieve some of the required magic.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 19:46:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:46:22 -0800
Subject: Using xreadlines
In-Reply-To: <910645.78379.qm@web30707.mail.mud.yahoo.com>
References: <910645.78379.qm@web30707.mail.mud.yahoo.com>
Message-ID: <50697b2c0902261646q3192cad3j1cdab7084a177e2f@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:32 PM, Brett Hedges <lilhedges69 at yahoo.com> wrote:
>
> Hi,
>
> I am using both xreadlines and files iterators for a script that I need to finish. I am iterating over the entire file but stopping to use xreadlines to grab certain lines as strings to process them.
>
> My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.
>
> My script has a loop that looks for a certain word then breaks the loop. But I need to go to the previous line before I break since the script uses that line (which gets processed). I'm sure there is an easier way to do this but since I am new to python and have spent a lot of time on this script I can't really go back and change a lot of things unless there is no possible way. Something like the example below.
>
> f.open("text.txt",'r')
> files = f.xreadlines()
> Name = "Section 1"
>
>
prev_line = None
> for line in f:
>   if Name in line:
>     while x<20
>       field = files.next()
>         if "2.6" in field:
            use(prev_line)
>      *****files.previousline()*****
>           break
    prev_line = line
>     x=x+1

Also, you could probably make the loop prettier by using enumerate()
or range() to track `x`.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bearophileHUGS at lycos.com  Thu Feb 26 20:09:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 26 Feb 2009 17:09:22 -0800 (PST)
Subject: Using xreadlines
References: <mailman.865.1235695165.11746.python-list@python.org>
Message-ID: <82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>

Brett Hedges:
> My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.<

In modern versions of Python you usually don't need xreadlines,
because files are iterable.

If your files are small, you can just read all the lines in a list
with open(...).readlines(), and then just use the item of the list
with the n-1 index.

If the file is quite large or you like to keep things lazy, then you
have to keep memory of the previous line, using an auxiliary variable.
You can also wrap this idiom into a generator function (or iterable
class, probably) that yields items and keeps memory of the last one
(but you can't ask the previous of the first item, of course).

You can also keep track of the absolute position of the lines in the
file, etc, or step back looking for newlines, etc, but it's not handy.

Bye,
bearophile


From cto at openmigration.net  Thu Feb 26 20:57:43 2009
From: cto at openmigration.net (geremy condra)
Date: Thu, 26 Feb 2009 20:57:43 -0500
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <f3cc57c60902261757j983c1b1wbf3e405391c8d9b9@mail.gmail.com>

Use 1 and 2 and treat them as equivalent to boolean true and false.
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From astan.chee at al.com.au  Thu Feb 26 21:06:47 2009
From: astan.chee at al.com.au (Astan Chee)
Date: Fri, 27 Feb 2009 13:06:47 +1100
Subject: factoring wx.Image
Message-ID: <49A74AB7.8010808@al.com.au>

Hi,
I want to factor (red, green and blue at the same time) an image using 
wx but without any GUI display or windows but it keeps crashing and if I 
set the checks to ignore it, it doesn't produce the images at all.
It looks like this:

import wx
img = wx.Image("star.jpg",wx.BITMAP_TYPE_BMP)
factor = 1
for i in range(1,30):
    image = img.AdjustChannels(factor, factor, factor, 1)
    fname = "star." + str(factor) + ".jpg"
    img.SaveFile(fname,wx.BITMAP_TYPE_JPEG)
    factor+=1

What am I missing here? What am I doing wrong? Can this even be done 
with only wx?
Thanks for any help.
Cheers
Astan



From mail at anjanesh.net  Thu Feb 26 22:11:18 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 08:41:18 +0530
Subject: Multiple conditional expression
Message-ID: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>

How do I achieve something like this using python ?
spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
: False : False)

spaces = True if form.getvalue('spaces') == 1 if
form.has_key('spaces') else False else False
-- 
Anjanesh Lekshmnarayanan


From steve at holdenweb.com  Thu Feb 26 22:14:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 22:14:50 -0500
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
Message-ID: <go7lsi$3db$1@ger.gmane.org>

Anjanesh Lekshminarayanan wrote:
> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
> : False : False)
> 
> spaces = True if form.getvalue('spaces') == 1 if
> form.has_key('spaces') else False else False

If you've got any sense at all, you don't. Write the logic so it makes
some sense to the casual reader. You will be that casual reader in a few
months.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 22:17:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 19:17:20 -0800
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
Message-ID: <50697b2c0902261917n14b2aa2dxdb173c2d8ddbe895@mail.gmail.com>

On Thu, Feb 26, 2009 at 7:11 PM, Anjanesh Lekshminarayanan
<mail at anjanesh.net> wrote:
> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
> : False : False)
>
> spaces = True if form.getvalue('spaces') == 1 if
> form.has_key('spaces') else False else False

That seems to just be an overly complicated way of writing:

spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From grante at visi.com  Thu Feb 26 22:26:09 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 26 Feb 2009 21:26:09 -0600
Subject: Multiple conditional expression
References: <mailman.871.1235704281.11746.python-list@python.org>
Message-ID: <geqdnabuHqHMwDrUnZ2dnUVZ_jWWnZ2d@posted.usinternet>

On 2009-02-27, Anjanesh Lekshminarayanan <mail at anjanesh.net> wrote:

> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True : False : False)

   if form.has_key('spaces'):
      spaces = form.getvalue('spaces') == 1
   else:
      spaces = False

However, my code is not acheiving entirely the same thing as
your example code.  The object 'spaces' ends up with the same
value, but my code fails to acheive the other presumed
objective: confusing the reader.
   
-- 
Grant



From http  Thu Feb 26 22:34:29 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 19:34:29 -0800
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
Message-ID: <7xhc2gv9h6.fsf@ruckus.brouhaha.com>

Chris Rebert <clp2 at rebertia.com> writes:
> spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

 spaces = form.has_key('spaces') and form.getvalue('spaces') == 1

or even (this is about the cgi module, I think)

 spaces = form.getvalue('spaces', None) == 1

But the == 1 comparison will always fail, since getvalue returns a string.


From mail at anjanesh.net  Thu Feb 26 22:51:30 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 09:21:30 +0530
Subject: UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in 
	position 10442: character maps to <undefined>
In-Reply-To: <loom.20090130T012214-679@post.gmane.org>
References: <1a7951080901290824p424caee3jb74b1343ce884916@mail.gmail.com>
	<ec96e1390901290849g507dcb17tf2372e573f4a5bb5@mail.gmail.com>
	<1a7951080901290909x4590d3c6m5d7d9c2185511ca6@mail.gmail.com>
	<ec96e1390901290921nd82a298s959338c52a28ba90@mail.gmail.com>
	<loom.20090129T200209-617@post.gmane.org>
	<ec96e1390901291358r1ba1a534iccb66c4fa642f832@mail.gmail.com>
	<loom.20090130T012214-679@post.gmane.org>
Message-ID: <1a7951080902261951j1fd72f38hf3a9af92ea9bc3bc@mail.gmail.com>

> (1) what is produced on Anjanesh's machine
>>> sys.getdefaultencoding()
'utf-8'

> (2) it looks like a small snippet from a Python source file!
Its a file containing just JSON data - but has some unicode characters
as well as it has data from the web.

> Anjanesh, Is it a .py file
Its a .json file. I have a bunch of these json files which Im parsing.
using json library.

> Instead of "something like", please report exactly what is there:
>
> print(ascii(open('the_file', 'rb').read()[10442-20:10442+21]))
>>> print(ascii(open('the_file', 'rb').read()[10442-20:10442+21]))
b'":42,"query":"0 1\xc2\xbb\xc3\x9d \\u2021 0\\u201a0 \\u2'

> Trouble with cases like this is as soon as they become interesting, the OP often
snatches somebody's one-liner that "works" (i.e. doesn't raise an exception),
makes a quick break for the county line, and they're not seen again :-)

Actually, I moved the files to my Ubuntu PC which has Python 2.5.2 and
didnt give the encoding issue. I just couldnt spend that much time on
why a couple of these files had encoding issues in Py3 since I had to
parse a whole lot of files.


From wuwei23 at gmail.com  Thu Feb 26 23:16:55 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 26 Feb 2009 20:16:55 -0800 (PST)
Subject: PythonWin -vs- Idle
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<mailman.855.1235688054.11746.python-list@python.org>
Message-ID: <aa6b3753-e928-4c83-b414-f7b055263496@b38g2000prf.googlegroups.com>

On Feb 27, 8:40?am, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gsche... at hotmail.com> wrote:
> > I am using version 2.5 and have not been able to locate PythonWin.? The
> > download just includes Idle for the environment.? Can anyone point me in the
> > right direction to download the PythonWin piece of this puzzle?
>
> Seems to be included in http://sourceforge.net/projects/pywin32/

It's also bundled with ActiveState's ActivePython:

http://www.activestate.com/activepython/


From JesseAldridge at gmail.com  Thu Feb 26 23:30:38 2009
From: JesseAldridge at gmail.com (Jesse Aldridge)
Date: Thu, 26 Feb 2009 20:30:38 -0800 (PST)
Subject: Can someone explain this behavior to me?
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
	<mailman.864.1235695119.11746.python-list@python.org>
Message-ID: <d5338596-da48-4f57-a379-ffdd909fd012@r29g2000vbp.googlegroups.com>

Ah, I get it.
Thanks for clearing that up, guys.


From grante at visi.com  Thu Feb 26 23:33:24 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 26 Feb 2009 22:33:24 -0600
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
Message-ID: <f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>

On 2009-02-27, Paul Rubin <http> wrote:

> But the == 1 comparison will always fail, since getvalue returns a string.

How do we know that from the what the OP posted?

-- 
Grant



From mail at anjanesh.net  Thu Feb 26 23:39:39 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 10:09:39 +0530
Subject: Multiple conditional expression
In-Reply-To: <f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
Message-ID: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>

> How do we know that from the what the OP posted?
Its CGI alright.
spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'

But I just dont see how
spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
True: False : False)
is complicated in anyway. Its not that hard to read at all.

Thanks.


From dg.gmane at thesamovar.net  Thu Feb 26 23:49:08 2009
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Fri, 27 Feb 2009 05:49:08 +0100
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <49A72FBF.8080206@mrabarnett.plus.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<49A72FBF.8080206@mrabarnett.plus.com>
Message-ID: <go7rc6$eli$1@ger.gmane.org>

MRAB wrote:
> Here's my solution (I haven't bothered with making it efficient, BTW):
> 
> import operator
> 
> def solve(n):
>     best_len = n
>     best_expr = ""
>     for x in range(1, n - 2):
>         for y in range(x, n):
>             for op, name in operator_list:
>                 # Does this pair with this op give the right answer?
>                 if op(x, y) == n:
>                     lx, ex = numbers[x - 1]
>                     ly, ey = numbers[y - 1]
>                     # How many digits in total?
>                     l = lx + ly
>                     # Fewer digits than any previous attempts?
>                     if l < best_len:
>                         # Build the expression.
>                         e = "(%s %s %s)" % (ex, name, ey)
>                         best_len, best_expr = l, e
>     return best_len, best_expr
> 
> operator_list = [(operator.add, "+"), (operator.sub, "-"), 
> (operator.mul, "*"), (operator.div, "/"), (operator.pow, "^")]
> 
> # Tuples contain number of digits used and expression.
> numbers = [(1, str(n)) for n in range(1, 4)]
> 
> for n in range(4, 34):
>     numbers.append(solve(n))
> 
> for i, (l, e) in enumerate(numbers):
>     print "%2d = %s" % (i + 1, e)

Sadly this doesn't work because you're assuming that the shortest 
expression always involves increasing the size of the numbers at every 
step. For example, your algorithm for 63 gives:

(3 * (3 * (1 + (2 * 3))))

which involves 4 operations, whereas the simplest is:

2**(2*3)-1

which only involves 3 (but has an intermediate value 2**6=64 above the 
target value).

Fixing this is actually pretty hard, because the search space becomes 
very large if you allow yourself arbitrarily large numbers. You can't do 
any obvious pruning that I can think of, because operations between very 
large numbers can end up very small (for example, 13**3-3**7=10 even 
though 13**3=2197 and 3**7=2187 are both very large), and the shortest 
path to a small number might go through very large numbers (I bet with a 
bit more thought than I have put into it, you could come up with some 
examples where the intermediate calculations are arbitrarily larger than 
the end result). As well as the growth of the search space, the 
computations get hairy too, try computing 3**3**3**3 for example (or 
better, don't, because it has 3638334640025 digits).

I haven't got a solution that can be guaranteed correct and is feasible 
to compute for anything but very small examples - anyone done better?

Dan



From benjamin at python.org  Thu Feb 26 23:49:54 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 27 Feb 2009 04:49:54 +0000 (UTC)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
Message-ID: <loom.20090227T044929-209@post.gmane.org>

Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:

> f any one suggests better solution then i will be very happy.Advance thanks
for any help.Shan

Use a set.






From python at rcn.com  Thu Feb 26 23:54:40 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 20:54:40 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
Message-ID: <6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>

[Paul Rubin]
> Ehh, I guess I'm not surprised at the slowdown and extra complexity
> from the second dict. ?Oh well. ?If the module really turns out to be
> really used a lot, another (messy) approach would be to write a C
> extension that uses a doubly linked list some day.

That seems like an ideal implementation to me.

  O(1): appending, popping, searching, and deletion
  O(n): traversal

Raymond


From clp2 at rebertia.com  Fri Feb 27 00:11:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 21:11:28 -0800
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
	<1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
Message-ID: <50697b2c0902262111o4f566fd8r6d4a13f1fcd6c632@mail.gmail.com>

On Thu, Feb 26, 2009 at 8:39 PM, Anjanesh Lekshminarayanan
<mail at anjanesh.net> wrote:
>> How do we know that from the what the OP posted?
> Its CGI alright.
> spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'
>
> But I just dont see how
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
> True: False : False)
> is complicated in anyway. Its not that hard to read at all.

You have /nested/ /ternary/ expressions /without/ any disambiguating
parentheses. And you unnecessarily use boolean constants. The latter
and the stuff in italics is what makes your code hard to understand.

As I showed, you can write the *exact same thing* without using
ternary expressions at all (win!), much less nested ones, and without
any boolean constants.
And it's even 16 characters shorter.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Fri Feb 27 00:15:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 21:15:39 -0800
Subject: removing duplication from a huge list.
In-Reply-To: <loom.20090227T044929-209@post.gmane.org>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
Message-ID: <50697b2c0902262115x37b098b2s908710fbc79529ec@mail.gmail.com>

On Thu, Feb 26, 2009 at 8:49 PM, Benjamin Peterson <benjamin at python.org> wrote:
> Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:
>
>> f any one suggests better solution then i will be very happy.Advance thanks
> for any help.Shan
>
> Use a set.

To expand on that a bit:

counted_recs = set(rec[0] for rec in some_fun())
#or in Python 3.0:
counted_recs = {rec[0] for rec in some_fun()}

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From venutaurus539 at gmail.com  Fri Feb 27 00:16:42 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 21:16:42 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.834.1235672099.11746.python-list@python.org>
Message-ID: <e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>

On Feb 26, 11:14?pm, "Paddy O'Loughlin" <patrick.olough... at gmail.com>
wrote:
> Try this as an outline:
> #### script1.py
> from subprocess import Popen
>
> if __name__ == '__main__':
> ? ? ? ? scriptname = "script2.py"
>
> ? ? ? ? Popen("python %s" % scriptname, shell=True)
>
> ? ? ? ? print "I'm done"
>
> #### script2.py
> from time import sleep
>
> if __name__ == '__main__':
> ? ? while (True):
> ? ? ? ? print "waiting.."
> ? ? ? ? sleep(2)
>
> ###########################
> If you install python using the Windows Installer (.exe), it should
> set up .py files to be opened by python when double-clicking on them.
> Alternatively, you can right-click on your .py file and go to "Open
> With..." then "choose program", then click "Browse...", you can Browse
> to the python executable, so Explorer will use it to open .py files
> when you double-click on them.
>
> As someone else mentioned there is also a py2exe program. Google it.
>
> 2009/2/26 venutaurus... at gmail.com <venutaurus... at gmail.com>:
>
>
>
> > Hello all,
> > ? ? ? ? ? I've a strange requirement where I need to run a python
> > script just as we run an exe (by double clicking through windows
> > explorer or by typing the script name at command prompt). In that
> > process I should be able to execute another python script in such a
> > way that, the second script should continue running but the main one
> > should terminate without effecting the second one.
>
> > ? ? ? ? ? ? ? ? ? ?My requirement may be little confusing so please
> > get back if you didn't understand what I meant above.
>
> > Thank you,
> > Venu.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> --
> "Ray, when someone asks you if you're a god, you say YES!"

Thanks for the reply,,
            I am trying to use the above application using psexec()in
command line.But it failed returning the error message

 exited with error code 255.

              But when I ran the application normally it worked
fine.Do I need to add anything to my python script(either the main one
or the script which is calling it) to make it work.

Thank you,
Venu Madhav.


From tarundevnani at gmail.com  Fri Feb 27 00:47:44 2009
From: tarundevnani at gmail.com (tarun)
Date: Fri, 27 Feb 2009 11:17:44 +0530
Subject: Killing Child Process
Message-ID: <c88245360902262147j534def4ag2c1e59d94e946728@mail.gmail.com>

Hello Group,

I've spwaned a process using os.spwanl. As part of this process, I spwan one
more process, using subprocess.Popen.
After I close the the process spwaned using os.spwanl, the child process
started by it using subprocess.Popen, doesn't get closed.
Is there any way to do this in python 2.5.1?

Thanks,
Tarun
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From odeits at gmail.com  Fri Feb 27 01:17:58 2009
From: odeits at gmail.com (odeits)
Date: Thu, 26 Feb 2009 22:17:58 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
Message-ID: <b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>

On Feb 26, 9:15?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 8:49 PM, Benjamin Peterson <benja... at python.org> wrote:
> > Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:
>
> >> f any one suggests better solution then i will be very happy.Advance thanks
> > for any help.Shan
>
> > Use a set.
>
> To expand on that a bit:
>
> counted_recs = set(rec[0] for rec in some_fun())
> #or in Python 3.0:
> counted_recs = {rec[0] for rec in some_fun()}
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

How big of a list are we talking about? If the list is so big that the
entire list cannot fit in memory at the same time this approach wont
work e.g. removing duplicate lines from a very large file. A couple of
things come into play at that point. If order does not matter then I
would suggest looking at some recipes for first sorting the large file
and then iterating through the lines removing duplicates as you go
( if cur_line != last_line: write cur_line; last_line = cur_line )

If order does matter then let me know and I will post a recipe for
that.


From niklas.norrthon at hotmail.com  Fri Feb 27 01:23:10 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Thu, 26 Feb 2009 22:23:10 -0800 (PST)
Subject: PythonWin -vs- Idle
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com> 
	<mailman.867.1235695508.11746.python-list@python.org>
Message-ID: <6eb932a4-74d3-4925-9c78-6cc8ae957e02@a39g2000yqc.googlegroups.com>

On 27 Feb, 01:40, Steve Holden <st... at holdenweb.com> wrote:
> Chris Rebert wrote:
> > On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gsche... at hotmail.com> wrote:
> >> Hello,
> >> Python newbie here. ?I am working with Python and geoprocessing in ArcGIS.
> >> I'm taking a training course online and the exercise I'm working on makes
> >> mention of using PythonWin instead of Idle.
>
> >> I am using version 2.5 and have not been able to locate PythonWin. ?The
> >> download just includes Idle for the environment. ?Can anyone point me in the
> >> right direction to download the PythonWin piece of this puzzle?
>
> > Seems to be included inhttp://sourceforge.net/projects/pywin32/
>
> And it's well worth getting, since it's the recommended programming
> environment for ArcGIS. IIRC it uses the COM server capabilities to
> achieve some of the required magic.

It's the recommended programming environment in ESRI's geoprocessing
classes.
The only stuff that is specific to PythonWin is the debugging, (which
you can
do in IDLE too, just in a slightly different way).

Personally I do most of my python hacking in emacs, both when my code
calls
arcgisscripting and otherwise. Sometimes I use IDLE, since in emacs
(and PythonWin)
I miss the ability to restart the interpreter process to get a clean
environment.

There is one thing I use the pywin32 library for, and that is a little
hack to
get around the issue that each version of ArcGIS is bound to a
specific python version:

try:
    import arcgisscripting
except ImportError:
    import win32com.client
    class arcgisscripting(object):
        @staticmethod
        def create():
            return win32com.client.Dispatch
('esriGeoprocessing.GpDispatch.1')

With this little code snippet in a utility module, I can use python
2.6 with ArcGIS, and I can test my scritps with python 2.4, to ensure
that they run in ArcGIS 9.2 environments.

/Niklas Norrthon


From odeits at gmail.com  Fri Feb 27 01:26:18 2009
From: odeits at gmail.com (odeits)
Date: Thu, 26 Feb 2009 22:26:18 -0800 (PST)
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>

On Feb 26, 3:05?am, Clarendon <jine... at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
>
> L=['a', 'b', 'c', 'a']
>
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
>
> How do you delete all 'a's?
> I would really appreciate your help.
>
> Thanks.

while 'a' in L:
   L.remove('a')

not the most efficient but it works


From clp2 at rebertia.com  Fri Feb 27 01:59:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 22:59:54 -0800
Subject: Delete all items in the list
In-Reply-To: <35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
Message-ID: <50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>

On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
> On Feb 26, 3:05?am, Clarendon <jine... at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance:
>>
>> L=['a', 'b', 'c', 'a']
>>
>> I want to delete all 'a's from the list.
>> But if L.remove('a') only deletes the first 'a'.
>>
>> How do you delete all 'a's?
>> I would really appreciate your help.
>>
>> Thanks.
>
> while 'a' in L:
> ? L.remove('a')
>
> not the most efficient but it works

"Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
= number of 'a's in L], versus just N. And that's not even accounting
for all the extra element movement done by .remove()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From hv at tbz-pariv.de  Fri Feb 27 03:20:17 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Fri, 27 Feb 2009 09:20:17 +0100
Subject: OT: handling multiple software repositories
In-Reply-To: <mailman.828.1235665365.11746.python-list@python.org>
References: <70npmbFgb464U1@mid.individual.net>	<49A6BEE7.2090605@timgolden.me.uk>
	<mailman.828.1235665365.11746.python-list@python.org>
Message-ID: <70pm22Fh2534U1@mid.individual.net>

Luis Zarrabeitia schrieb:
...
> It's quite good (and easy to install, unlike gforge), but the developers are 
> moving on to a version 2.0 that you can find around here: 
> 
> http://basieproject.org/   (yeah, the website is ugly). 

Is uses django. That's nice since I know it.

But the page looks like it is not ready for public. But it looks
promising.

  Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From bearophileHUGS at lycos.com  Fri Feb 27 03:49:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:49:57 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
Message-ID: <5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>

Raymond Hettinger:
>Paul Rubin:
>>another (messy) approach would be to write a C
>>extension that uses a doubly linked list some day.
>
> That seems like an ideal implementation to me.

This was my Python implementation, where the delete too is O(1), but
it's slow:
http://code.activestate.com/recipes/498195/

I think the C extension with the doubly linked list is the best
approach.
Note that in modern CPUs caches are able to change the performance a
lot. So reducing the memory used is very important. So using the XOR
(or subtraction) trick to use only 1 pointer for each key-value may be
useful to keep performance not too much far from the normal python
dicts:
http://en.wikipedia.org/wiki/XOR_linked_list

Bye,
bearophile


From bearophileHUGS at lycos.com  Fri Feb 27 03:55:06 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:55:06 -0800 (PST)
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com> 
	<mailman.873.1235704646.11746.python-list@python.org>
Message-ID: <eb853273-0923-4c46-91d6-db6bc424290a@q9g2000yqc.googlegroups.com>

Chris Rebert:
> That seems to just be an overly complicated way of writing:
>
> spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

Better:

spaces = bool(('spaces' in form) and form.getvalue('spaces') == 1)

Bye,
bearophile


From bearophileHUGS at lycos.com  Fri Feb 27 03:58:39 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:58:39 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
Message-ID: <516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>

odeits:
> How big of a list are we talking about? If the list is so big that the
> entire list cannot fit in memory at the same time this approach wont
> work e.g. removing duplicate lines from a very large file.

If the data are lines of a file, and keeping the original order isn't
important, then the first to try may be to use the unix (or cygwin on
Windows) commands sort and uniq.

Bye,
bearophile


From http  Fri Feb 27 04:00:46 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 01:00:46 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
Message-ID: <7xfxi08da9.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> So using the XOR (or subtraction) trick to use only 1 pointer for
> each key-value may be useful to keep performance not too much far
> from the normal python dicts: http://en.wikipedia.org/wiki/XOR_linked_list

I don't see how to delete a randomly chosen node if you use that
trick, since the hash lookup doesn't give you two consecutive nodes
in the linked list to xor together.  Maybe you could do something
intricate with skip lists and end up with O(log n) deletion.


From lkassana at gmail.com  Fri Feb 27 04:02:57 2009
From: lkassana at gmail.com (lameck kassana)
Date: Fri, 27 Feb 2009 12:02:57 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <49A6A3FB.60708@holdenweb.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
Message-ID: <c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>

now it is working but i wonder it brings higher number of count as if it
counts files in wholes computer can you check in my code and correct me
------------------------------------------------
import glob
import os
 file_count=0
for files in glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://192.168.0.45/loader/Files/file_log/v20090225>
*"):
      file_count += len(files)
print 'Found', file_count, 'files in cwd'
--------------------------------------------------------------------------------------------------------------------------------

the results are Found 435656 files in cwd  --which is impossible since files
are around six thousands daily.
thanks in advance

On Thu, Feb 26, 2009 at 5:15 PM, Steve Holden <steve at holdenweb.com> wrote:

> lameck kassana wrote:
> > ok my original question is how can count the files of ceratin pattern(eg
> > *.txt) in remote directory .It seems use of glob.glob() for remote
> > directory is not working .Example I want to count the files in following
> > shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can
> > do it by using glob.glob()
> >
> >>> glob.glob(r"\\houseboy\sholden\*.txt")
> ['\\\\houseboy\\sholden\\pgin1.txt',
> '\\\\houseboy\\sholden\\POSTGRES.TXT',
> '\\\\houseboy\\sholden\\gatesquote.txt',
> '\\\\houseboy\\sholden\\UbuntuWhatNow.txt',
>  '\\\\houseboy\\sholden\\patch001.txt']
> >>> glob.glob(r"\\192.168.2.200\sholden\*.txt")
> ['\\\\192.168.2.200\\sholden\\pgin1.txt',
> '\\\\192.168.2.200\\sholden\\POSTGRES.TXT',
> '\\\\192.168.2.200\\sholden\\gatesquote.txt',
> '\\\\192.168.2.200\\sholden\\UbuntuWhatNow.txt',
> '\\\\192.168.2.200\\sholden\\patch001.txt']
> >>>
>
> Working just fine for me.
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
>
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From stefan_ml at behnel.de  Fri Feb 27 04:18:06 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 27 Feb 2009 10:18:06 +0100
Subject: removing duplication from a huge list.
In-Reply-To: <516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>
Message-ID: <49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>

bearophileHUGS at lycos.com wrote:
> odeits:
>> How big of a list are we talking about? If the list is so big that the
>> entire list cannot fit in memory at the same time this approach wont
>> work e.g. removing duplicate lines from a very large file.
> 
> If the data are lines of a file, and keeping the original order isn't
> important, then the first to try may be to use the unix (or cygwin on
> Windows) commands sort and uniq.

or preferably "sort -u", in case that's supported.

Stefan


From nytrokiss at gmail.com  Fri Feb 27 04:20:20 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Fri, 27 Feb 2009 11:20:20 +0200
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
In-Reply-To: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
	<op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <8a6b8e350902270120j7ceb5faaxf773075a07eb289f@mail.gmail.com>

You can hook the it on the main thread and just pass it. And let the threads
execute.

On Thu, Feb 26, 2009 at 10:47 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Thu, 26 Feb 2009 16:17:42 -0200, Maxim Khitrov <mkhitrov at gmail.com>
> escribi?:
>
>
>  I'm looking for a function in the standard library or pywin32 package
>> that will block until a certain condition is met or it is interrupted
>> by Ctrl-C. For example, time.sleep() would have been perfect for my
>> needs if thread.interrupt_main() could interrupt the call from another
>> thread in the same way that Ctrl-C does. Unfortunately, that is not
>> the case.
>>
>> Another thing I tried was creating a pipe with os.pipe() and issuing a
>> read call on it. The event to exit was a single byte written to the
>> other end of the pipe, but Ctrl-C could not interrupt the read call.
>> The threading.Event class does not work for me, because it uses short
>> sleep intervals for timed waits. I need the reaction to be as close to
>> instant as possible, something like this will not do:
>>
>> while not <some condition is met>:
>>   sleep(0.01)
>>
>> I actually replaced threading.Event with my own version that uses
>> native Windows events, and waits on those also cannot be interrupted
>> by Ctrl-C. I'm trying to achieve the same effect as that while loop
>> and I don't care what the condition to exit is, but the loop needs to
>> exit as soon as the condition is met without waiting for up to X
>> additional milliseconds. Any ideas?
>>
>
> You may try MsgWaitForMultipleObjects - send a message to the main thread
> from the other thread.
> An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,
> but I've never actually tried in Python.
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From pranny at gmail.com  Fri Feb 27 04:33:44 2009
From: pranny at gmail.com (pranav)
Date: Fri, 27 Feb 2009 01:33:44 -0800 (PST)
Subject: String search
Message-ID: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>

Greeting fellow pycoders,

I have a script that browses large codes and replaces certain text
with some other text. Of lately i observed an issue.Some of the
original text were like

<cfif IsDefined("attributes.SOFTPREREQ")>
    ,N'#attributes.SOFTPREREQ#'
</cfif>

My module does scan this code and suggests replacement to this code.
But when i use the string.replace() method, it just fails. A
string.find() for above code in the whole file returns code -1.
Where am i going wrong? I figure it could be something to do with
character encoding or else.

Please someone guide me soon. I have a deadline to attend :-(

Thanks in advance,

Pranav




From gagsl-py2 at yahoo.com.ar  Fri Feb 27 04:43:48 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 07:43:48 -0200
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
Message-ID: <op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 07:02:57 -0200, lameck kassana <lkassana at gmail.com>  
escribi?:

> now it is working but i wonder it brings higher number of count as if it
> counts files in wholes computer can you check in my code and correct me
> ------------------------------------------------
> import glob
> import os
>  file_count=0
> for files in  
> glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://192.168.0.45/loader/Files/file_log/v20090225>
> *"):

Add this line:
        print files

>       file_count += len(files)
> print 'Found', file_count, 'files in cwd'
> --------------------------------------------------------------------------------------------------------------------------------
>
> the results are Found 435656 files in cwd  --which is impossible since  
> files
> are around six thousands daily.

-- 
Gabriel Genellina



From CinnamonDonkey at googlemail.com  Fri Feb 27 04:45:39 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 27 Feb 2009 01:45:39 -0800 (PST)
Subject: Microsoft Message Queues
Message-ID: <c312ac5a-3262-43ef-b2b0-e50bfb074db8@h20g2000yqn.googlegroups.com>

Hi All,

I am looking to use win32com to set-up a Microsoft Message Queue
(MSMQ) between two or more computers connected on a LAN.

I have found this posting:

http://groups.google.co.uk/group/comp.lang.python/browse_thread/thread/80b42375ae84e3d7/989b864575997a9e?hl=en&lnk=gst&q=msmq#989b864575997a9e

...Which is a great start. But I am fairly new to all this python
business, let alone COM.

Can someone please point me in the right direction to modify this
example so that it works across multiple computers connected via the
LAN.

I have demonstrated it working locally... I just need to progress to
that next step.

Regards,
Shaun



From arunjr at gmail.com  Fri Feb 27 04:45:55 2009
From: arunjr at gmail.com (Aj)
Date: Fri, 27 Feb 2009 01:45:55 -0800 (PST)
Subject: decimal to string conv
Message-ID: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>

Hi all,

I am trying to convert a list to string.
example [80, 89,84,72,79,78,0] is my input. I could make it to just
[0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
but I wanted it to be like "PYTHON".
I couldnt even convert 0x50 to 'P'. Is there any library api available
to do this? it will be really helpful to me.
dont bang me if its already being asked. I just 'dived' into python
yesterday.

cheers
Aj.


From clp2 at rebertia.com  Fri Feb 27 04:58:26 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 01:58:26 -0800
Subject: decimal to string conv
In-Reply-To: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
References: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
Message-ID: <50697b2c0902270158m582bdfdcy87d2b59cde6f1314@mail.gmail.com>

On Fri, Feb 27, 2009 at 1:45 AM, Aj <arunjr at gmail.com> wrote:
> Hi all,
>
> I am trying to convert a list to string.
> example [80, 89,84,72,79,78,0] is my input. I could make it to just
> [0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
> but I wanted it to be like "PYTHON".
> I couldnt even convert 0x50 to 'P'. Is there any library api available
> to do this? it will be really helpful to me.

lst = [80, 89,84,72,79,78,0]
print ''.join(map(chr, lst[:-1]))

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From arunjr at gmail.com  Fri Feb 27 05:07:53 2009
From: arunjr at gmail.com (Aj)
Date: Fri, 27 Feb 2009 02:07:53 -0800 (PST)
Subject: decimal to string conv
References: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
	<mailman.886.1235728711.11746.python-list@python.org>
Message-ID: <2fd546ee-b57d-446d-8168-d81a97302836@e18g2000yqo.googlegroups.com>

On Feb 27, 10:58?am, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 27, 2009 at 1:45 AM, Aj <aru... at gmail.com> wrote:
> > Hi all,
>
> > I am trying to convert a list to string.
> > example [80, 89,84,72,79,78,0] is my input. I could make it to just
> > [0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
> > but I wanted it to be like "PYTHON".
> > I couldnt even convert 0x50 to 'P'. Is there any library api available
> > to do this? it will be really helpful to me.
>
> lst = [80, 89,84,72,79,78,0]
> print ''.join(map(chr, lst[:-1]))
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

wow... that was quick and it works perfect with my inputs.
thanx & have a nice day.

cheers
Aj


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 27 05:15:25 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 27 Feb 2009 11:15:25 +0100
Subject: String search
In-Reply-To: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
Message-ID: <49a7bd24$0$5835$426a74cc@news.free.fr>

pranav a ?crit :
> Greeting fellow pycoders,
> 
> I have a script that browses large codes and replaces certain text
> with some other text. Of lately i observed an issue.Some of the
> original text were like
> 
> <cfif IsDefined("attributes.SOFTPREREQ")>
>     ,N'#attributes.SOFTPREREQ#'
> </cfif>
> 
> My module does scan this code and suggests replacement to this code.
> But when i use the string.replace() method, it just fails. A
> string.find() for above code in the whole file returns code -1.
> Where am i going wrong? 

Not posting a minimal (and if possible runnable) excerpt of your code 
exhibiting the problem, along with test data.

>I figure it could be something to do with
> character encoding or else.

or with white spaces (including newlines characters), or whatever.

As a general guideline : any non-trivial text parsing requires a 
non-trivial parser.


From bearophileHUGS at lycos.com  Fri Feb 27 05:15:27 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 02:15:27 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
Message-ID: <3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>

Paul Rubin:
>I don't see how to delete a randomly chosen node if you use that trick, since the hash lookup doesn't give you two consecutive nodes in the linked list to xor together.<

Thank you, I think you are right, I am sorry.
So on 32-bit CPUs you need to add 8 bytes to each value.

On 64-bit CPUs you may use a double indexed list, instead of a double
linked list. And each index can be stored in 6 bytes instead of 8
(281_474_976_710_656 buckets may be enough for most people), so you
need only 12 bytes for two indexes instead of 16 bytes, this helps the
L1 cache (and the small L2 cache too on Core i7) a bit. But this may
slow down too much the ordered iteration.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 05:17:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 08:17:18 -0200
Subject: String search
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
Message-ID: <op.upz9i4iqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 07:33:44 -0200, pranav <pranny at gmail.com> escribi?:

> Greeting fellow pycoders,
>
> I have a script that browses large codes and replaces certain text
> with some other text. Of lately i observed an issue.Some of the
> original text were like
>
> <cfif IsDefined("attributes.SOFTPREREQ")>
>     ,N'#attributes.SOFTPREREQ#'
> </cfif>
>
> My module does scan this code and suggests replacement to this code.
> But when i use the string.replace() method, it just fails. A
> string.find() for above code in the whole file returns code -1.
> Where am i going wrong? I figure it could be something to do with
> character encoding or else.

Do you mean, you look for those three complete lines with a single  
xxxx.find(...)?
Hard to guess... maybe there is some withespace at the end of a line, some  
additional leading whitespace in the second line, a tab character instead  
of spaces, maybe those ' are instead ? or `, maybe the file does not use  
\n as a line termination, maybe the file encoding doesn't match what you  
expect...

If string.find() does return -1, it is because the text you're looking for  
is NOT inside the string. No use in questioning that. If you think the  
text IS there, get a decent hex editor and examine the file near the  
supposed match, character by character, and see WHERE is the difference  
(there MUST be a difference).

-- 
Gabriel Genellina



From lkassana at gmail.com  Fri Feb 27 05:17:28 2009
From: lkassana at gmail.com (lameck kassana)
Date: Fri, 27 Feb 2009 13:17:28 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
	<op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>

At last i did it it was this wrong line file_count += len(files) ---it
supposed to be  file_count+=1
but thanks for help ya python masters .Steven Holden ,,,, thanks very very
much for your tip about raw string

On Fri, Feb 27, 2009 at 12:43 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Fri, 27 Feb 2009 07:02:57 -0200, lameck kassana <lkassana at gmail.com>
> escribi?:
>
>  now it is working but i wonder it brings higher number of count as if it
>> counts files in wholes computer can you check in my code and correct me
>> ------------------------------------------------
>> import glob
>> import os
>>  file_count=0
>> for files in
>> glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://
>> 192.168.0.45/loader/Files/file_log/v20090225>
>> *"):
>>
>
> Add this line:
>       print files
>
>      file_count += len(files)
>> print 'Found', file_count, 'files in cwd'
>>
>> --------------------------------------------------------------------------------------------------------------------------------
>>
>> the results are Found 435656 files in cwd  --which is impossible since
>> files
>> are around six thousands daily.
>>
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From gagsl-py2 at yahoo.com.ar  Fri Feb 27 06:08:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 09:08:10 -0200
Subject: factoring wx.Image
References: <49A74AB7.8010808@al.com.au>
Message-ID: <op.upzucilux6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 00:06:47 -0200, Astan Chee <astan.chee at al.com.au>
escribi?:

> I want to factor (red, green and blue at the same time) an image using  
> wx but without any GUI display or windows but it keeps crashing

What do you mean? Really crashing? Or do you get a Python stack trace?

> and if I set the checks to ignore it, it doesn't produce the images at  
> all.
> It looks like this:
>
> import wx
> img = wx.Image("star.jpg",wx.BITMAP_TYPE_BMP)

Are you sure the format is BITMAP_TYPE_BMP? The name seems to indicate
otherwise...

> factor = 1
> for i in range(1,30):
>     image = img.AdjustChannels(factor, factor, factor, 1)

And multiplying r,g,b by 30 you'll get an almost white image - is it what
you want?

>     fname = "star." + str(factor) + ".jpg"
>     img.SaveFile(fname,wx.BITMAP_TYPE_JPEG)
>     factor+=1

Note that you're saving the ORIGINAL image here...

>
> What am I missing here? What am I doing wrong? Can this even be done  
> with only wx?

Try again...

-- 
Gabriel Genellina



From eckhardt at satorlaser.com  Fri Feb 27 06:29:16 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 27 Feb 2009 12:29:16 +0100
Subject: struct.unpack() on a stream
Message-ID: <edvk76-tf3.ln1@satorlaser.homedns.org>

Hi!

I have a socket from which I would like to parse some data, how would I do
that? Of course, I can manually read data from the socket until unpack()
stops complaining about a lack of data, but that sounds rather inelegant.

Any better suggestions?

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From odeits at gmail.com  Fri Feb 27 06:34:34 2009
From: odeits at gmail.com (odeits)
Date: Fri, 27 Feb 2009 03:34:34 -0800 (PST)
Subject: String search
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
	<mailman.888.1235729870.11746.python-list@python.org>
Message-ID: <f43870bf-232d-4b34-8426-862fabd5e2b7@r15g2000prh.googlegroups.com>

On Feb 27, 2:17?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 27 Feb 2009 07:33:44 -0200, pranav <pra... at gmail.com> escribi?:
>
> > Greeting fellow pycoders,
>
> > I have a script that browses large codes and replaces certain text
> > with some other text. Of lately i observed an issue.Some of the
> > original text were like
>
> > <cfif IsDefined("attributes.SOFTPREREQ")>
> > ? ? ,N'#attributes.SOFTPREREQ#'
> > </cfif>
>
> > My module does scan this code and suggests replacement to this code.
> > But when i use the string.replace() method, it just fails. A
> > string.find() for above code in the whole file returns code -1.
> > Where am i going wrong? I figure it could be something to do with
> > character encoding or else.
>
> Do you mean, you look for those three complete lines with a single ?
> xxxx.find(...)?
> Hard to guess... maybe there is some withespace at the end of a line, some ?
> additional leading whitespace in the second line, a tab character instead ?
> of spaces, maybe those ' are instead ? or `, maybe the file does not use ?
> \n as a line termination, maybe the file encoding doesn't match what you ?
> expect...
>
> If string.find() does return -1, it is because the text you're looking for ?
> is NOT inside the string. No use in questioning that. If you think the ?
> text IS there, get a decent hex editor and examine the file near the ?
> supposed match, character by character, and see WHERE is the difference ?
> (there MUST be a difference).
>
> --
> Gabriel Genellina

Try looking into regular expressions.... http://docs.python.org/library/re.html


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 06:52:38 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 09:52:38 -0200
Subject: struct.unpack() on a stream
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
Message-ID: <op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt  
<eckhardt at satorlaser.com> escribi?:

> I have a socket from which I would like to parse some data, how would I  
> do
> that? Of course, I can manually read data from the socket until unpack()
> stops complaining about a lack of data, but that sounds rather inelegant.
>
> Any better suggestions?

Read until you get the required bytes; use the size attribute.

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Fri Feb 27 07:10:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 27 Feb 2009 12:10:39 +0000
Subject: struct.unpack() on a stream
In-Reply-To: <op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
	<op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A7D83F.6060904@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt 
> <eckhardt at satorlaser.com> escribi?:
> 
>> I have a socket from which I would like to parse some data, how would 
>> I do
>> that? Of course, I can manually read data from the socket until unpack()
>> stops complaining about a lack of data, but that sounds rather inelegant.
>>
>> Any better suggestions?
> 
> Read until you get the required bytes; use the size attribute.
> 
The struct module has a function called "calcsize", eg:

 >>> import struct
 >>> struct.calcsize("<H")
2

That will tell you how many bytes to read.


From steve at holdenweb.com  Fri Feb 27 07:16:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 07:16:32 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	
	<go66hd$slr$1@ger.gmane.org>	
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>	
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
Message-ID: <49A7D9A0.1060803@holdenweb.com>

lameck kassana wrote:
> now it is working but i wonder it brings higher number of count as if it
> counts files in wholes computer can you check in my code and correct me
> ------------------------------------------------
> import glob
> import os
>  file_count=0
> for files in glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225
> <file://192.168.0.45/loader/Files/file_log/v20090225>*"):
>       file_count += len(files)
> print 'Found', file_count, 'files in cwd'
> --------------------------------------------------------------------------------------------------------------------------------
>  
> the results are Found 435656 files in cwd  --which is impossible since
> files are around six thousands daily.
> thanks in advance
> 
Please don't use "reply all" - I subscribe to the list, and will see
your posting there. I am pretty sure by now someone has pointed out that
you are adding the lengths of the filenames, and what you instead need is

file_count = len(glob.glob(...))

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steven.oldner at gmail.com  Fri Feb 27 07:42:29 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Fri, 27 Feb 2009 04:42:29 -0800 (PST)
Subject: Data Coding suggestions
Message-ID: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>

Just learning Python and have a project to create a weekly menu and a
shopping list from the menu.  This is something I do manually now, so
I'm automating it.

What I'd like is a list of menu choices, such as:
CODE-  Description - Est Cost

'B01 - Pancakes, Sausage,and Eggs - $5.80,
'L01 - Tuna Fish sandwices and chips -$ 4.25 ,
'D01 - Dirty Rice and Garlic Bread' - $5.70.

>From the choices, I'll create a weekly menu, print the menu, and then
print list of ingredients ( and sum the commom items)

CODE- Item - Qty. - Unit
B01 - pancake mix - 1 - box
B01 - milk             - .3 -gal
B01 - eggs            - 10 - each
D01 - dirty rice mix - 1 - box
D01 - milk             - .3 - gal.

I would like to expand the ingredient list to include other fields
like 'last purchase date' and 'reorder point'.

I've used an example program and started to code it but just realized
I've been coding ABAP in Python, that is set up a data structure and
use that.  What I want is to learn code Python in Python.

Question:  How should I set up the data?  I'm looking at maybe 70 menu
items and maybe 1000 items for the shopping list.  I need to be able
to maintain each item also.

I am using python 2.6 but would like to use 3.0.

Thanks for any suggestions!



From alecla at bluewin.ch  Fri Feb 27 07:46:37 2009
From: alecla at bluewin.ch (alex)
Date: Fri, 27 Feb 2009 04:46:37 -0800 (PST)
Subject: TextCtrl fully expanding at program start
Message-ID: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>

Hi all
I have a gridsizer consisting of two vertically stacked panels, one
with a StaticBox and the other with a TextCtrl.
I would like that the TextCtrl expands at program start fully to the
allocated panel size (lower panel of gridSizer).
Instead of like now, fully expanding in the width but not exapnding in
the height direction (two lines high).

I am currently running in circles so maybe can anybody help me?
See below for my best effort (OS WinXP, Python 2.5).

Thank you, regards Alex



import wx

class Frame(wx.Frame):
    def __init__(self, title, pos, size):
        wx.Frame.__init__(self, None, -1, title, pos, size)

        self.panel = wx.Panel(self)
        self.panel.SetBackgroundColour(wx.Colour(220, 220, 220))

        box1 = wx.StaticBox(self.panel, -1, "Program Preferences")
        box2 = wx.TextCtrl(self.panel, -1, size=(-1,-1),style =
wx.TE_MULTILINE|wx.TE_READONLY)


        gs = wx.GridSizer(2, 1, 0, 0)
        windowOneSizer = wx.BoxSizer(wx.VERTICAL)
        windowTwoSizer = wx.BoxSizer(wx.VERTICAL)

        windowOneSizer.Add(box1, 0, wx.ALL|wx.EXPAND, 0)
        windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)

        gs.Add(windowOneSizer, 0, wx.ALL|wx.EXPAND, 2)
        gs.Add(windowTwoSizer, 0, wx.ALL|wx.EXPAND, 2)

        self.panel.SetSizer(gs)
        self.Centre()
        self.Show(True)


class App(wx.App):
    def OnInit(self):
        frame = Frame("My Frame", (100, 100), (400, 250))
        frame.Show()
        self.SetTopWindow(frame)
        return True
#
#
if __name__ == '__main__':
#
    app = App()
    app.MainLoop()
#
#



From odeits at gmail.com  Fri Feb 27 07:49:39 2009
From: odeits at gmail.com (odeits)
Date: Fri, 27 Feb 2009 04:49:39 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com> 
	<49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>
Message-ID: <2c31654a-ca32-4d91-af0c-9cb72d0da793@o8g2000pre.googlegroups.com>

On Feb 27, 1:18?am, Stefan Behnel <stefan... at behnel.de> wrote:
> bearophileH... at lycos.com wrote:
> > odeits:
> >> How big of a list are we talking about? If the list is so big that the
> >> entire list cannot fit in memory at the same time this approach wont
> >> work e.g. removing duplicate lines from a very large file.
>
> > If the data are lines of a file, and keeping the original order isn't
> > important, then the first to try may be to use the unix (or cygwin on
> > Windows) commands sort and uniq.
>
> or preferably "sort -u", in case that's supported.
>
> Stefan

Although this is true, that is more of an answer to the question "How
do i remove duplicates from a huge list in Unix?".


From bearophileHUGS at lycos.com  Fri Feb 27 07:57:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 04:57:11 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com> 
	<49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>
	<2c31654a-ca32-4d91-af0c-9cb72d0da793@o8g2000pre.googlegroups.com>
Message-ID: <2a4bdb93-50aa-48f6-8979-277a5d2ca5e8@v19g2000yqn.googlegroups.com>

odeits:
> Although this is true, that is more of an answer to the question "How
> do i remove duplicates from a huge list in Unix?".

Don't you like cygwin?

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 07:58:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 10:58:51 -0200
Subject: struct.unpack() on a stream
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
	<op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
	<49A7D83F.6060904@mrabarnett.plus.com>
Message-ID: <op.up0g0dj8x6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 10:10:39 -0200, MRAB <google at mrabarnett.plus.com>  
escribi?:

> Gabriel Genellina wrote:
>> En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt  
>> <eckhardt at satorlaser.com> escribi?:
>>
>>> I have a socket from which I would like to parse some data, how would  
>>> I do
>>> that? Of course, I can manually read data from the socket until  
>>> unpack()
>>> stops complaining about a lack of data, but that sounds rather  
>>> inelegant.
>>>
>>> Any better suggestions?
>>  Read until you get the required bytes; use the size attribute.
>>
> The struct module has a function called "calcsize", eg:
>
>  >>> import struct
>  >>> struct.calcsize("<H")
> 2
>
> That will tell you how many bytes to read.

The struct module defines also a Struct class; instead of using the module  
functions, it's more efficient to create a Struct instance and call its  
methods when one is going to use the same format more than once:

py> s = struct.Struct("<H")
py> s.size
2
py> s.unpack("\x40\x00")
(64,)

That's the size attribute I was talking about - too tersely perhaps.

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Feb 27 08:03:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:03:32 -0500
Subject: Queries
In-Reply-To: <wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
Message-ID: <go8occ$pd$1@ger.gmane.org>

Dennis Lee Bieber wrote:
[...]
> {Oh, and since I saw, at work, a later post with a bunch of nested UNION
> statements: UNION requires all the tables to have the same number/type
> of columns -- you don't have that}

A rather fine point, but technically all that's required is the the
united *queries* have the same number and type of columns. I assume that
the OP was selecting *, though ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:05:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:05:23 -0500
Subject: problem with glob in remote directory or os.walk in remote  
	directory in windos
In-Reply-To: <c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	<go66hd$slr$1@ger.gmane.org>	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>	<49A6A3FB.60708@holdenweb.com>	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>	<op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
	<c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>
Message-ID: <go8ofs$pd$2@ger.gmane.org>

lameck kassana wrote:
> At last i did it it was this wrong line file_count += len(files) ---it
> supposed to be  file_count+=1
> but thanks for help ya python masters .Steven Holden ,,,, thanks very
> very much for your tip about raw string
> 
Lameck:

Please note that

file_count = 0
for files in (...):
    file_count += 1

can be *much* more efficiently expressed as

file_count = len(...)

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:08:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:08:42 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>	<871vtk7ub8.fsf@mulj.homelinux.net>	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>	<7x63iwg2wg.fsf@ruckus.brouhaha.com>	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
Message-ID: <go8om2$pd$3@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Paul Rubin:
>> I don't see how to delete a randomly chosen node if you use that trick, since the hash lookup doesn't give you two consecutive nodes in the linked list to xor together.<
> 
> Thank you, I think you are right, I am sorry.
> So on 32-bit CPUs you need to add 8 bytes to each value.
> 
> On 64-bit CPUs you may use a double indexed list, instead of a double
> linked list. And each index can be stored in 6 bytes instead of 8
> (281_474_976_710_656 buckets may be enough for most people), so you
> need only 12 bytes for two indexes instead of 16 bytes, this helps the
> L1 cache (and the small L2 cache too on Core i7) a bit. But this may
> slow down too much the ordered iteration.
> 
A sort of premature pessimization, then.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:10:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:10:30 -0500
Subject: Delete all items in the list
In-Reply-To: <50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
Message-ID: <go8opf$pd$4@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
[...]
>> while 'a' in L:
>>   L.remove('a')
>>
>> not the most efficient but it works
> 
> "Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
> = number of 'a's in L], versus just N. And that's not even accounting
> for all the extra element movement done by .remove()
> 
Surely 2*O(M*N) is O(M*N) since constant factors are irrelevant in
assessing performance order?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:13:35 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:13:35 -0500
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>	<mailman.873.1235704646.11746.python-list@python.org>	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
	<1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
Message-ID: <49A7E6FF.8060703@holdenweb.com>

Anjanesh Lekshminarayanan wrote:
>> How do we know that from the what the OP posted?
> Its CGI alright.
> spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'
> 
> But I just dont see how
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
> True: False : False)
> is complicated in anyway. Its not that hard to read at all.
> 
In that case I fear Python will be far too simple for your clearly
impressive mind. You've been programming for way too long ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:27:53 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:27:53 -0500
Subject: Data Coding suggestions
In-Reply-To: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
Message-ID: <go8pq2$77d$1@ger.gmane.org>

steven.oldner wrote:
> Just learning Python and have a project to create a weekly menu and a
> shopping list from the menu.  This is something I do manually now, so
> I'm automating it.
> 
> What I'd like is a list of menu choices, such as:
> CODE-  Description - Est Cost
> 
> 'B01 - Pancakes, Sausage,and Eggs - $5.80,
> 'L01 - Tuna Fish sandwices and chips -$ 4.25 ,
> 'D01 - Dirty Rice and Garlic Bread' - $5.70.
> 
>>From the choices, I'll create a weekly menu, print the menu, and then
> print list of ingredients ( and sum the commom items)
> 
> CODE- Item - Qty. - Unit
> B01 - pancake mix - 1 - box
> B01 - milk             - .3 -gal
> B01 - eggs            - 10 - each
> D01 - dirty rice mix - 1 - box
> D01 - milk             - .3 - gal.
> 
> I would like to expand the ingredient list to include other fields
> like 'last purchase date' and 'reorder point'.
> 
> I've used an example program and started to code it but just realized
> I've been coding ABAP in Python, that is set up a data structure and
> use that.  What I want is to learn code Python in Python.
> 
> Question:  How should I set up the data?  I'm looking at maybe 70 menu
> items and maybe 1000 items for the shopping list.  I need to be able
> to maintain each item also.
> 
> I am using python 2.6 but would like to use 3.0.
> 
Well from the nature of the task it seems evident that the data should
be long-lived, and therefore need to be stored on disk. The natural way
to deal with them in the program would be to have recipes, each of which
was associated with a number of ingredient requirements, each of which
was associated with an ingredient.

That way, you can adjust the prices of your ingredients as the market
varies.

Recent versions of Python come with sqlite, a low-cost but surprisingly
efficient relational database implementation. I'd suggest using that,
with the following tables:

Recipe:
  id          integer primary key
  name        string

Ingredient
  id          integer primary key
  name        string
  unit        string [oz, gal, etc.]
  cost        number [cost per unit]

Requirement
  recipe      integer [id of recipe]
  ingredient  integer [id of ingredient]
  quantity    number [amount required for one serving]

So each recipe will have one row in the recipe table, a number of rows
in the requirement table, each of which points also to the relevant
ingredient.

>From there it's a relatively simple task to work out how much of which
ingredients is required to create N helpings of a specific recipe, and
the cost as well.

It will mean understanding a little more about database than you perhaps
do right now, but that's a useful addition to any programmer's bag of
tricks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Fri Feb 27 08:46:47 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 05:46:47 -0800
Subject: Delete all items in the list
In-Reply-To: <go8opf$pd$4@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
	<go8opf$pd$4@ger.gmane.org>
Message-ID: <50697b2c0902270546l1badb577kde883f998a24575@mail.gmail.com>

On Fri, Feb 27, 2009 at 5:10 AM, Steve Holden <steve at holdenweb.com> wrote:
> Chris Rebert wrote:
>> On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
> [...]
>>> while 'a' in L:
>>> ? L.remove('a')
>>>
>>> not the most efficient but it works
>>
>> "Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
>> = number of 'a's in L], versus just N. And that's not even accounting
>> for all the extra element movement done by .remove()
>>
> Surely 2*O(M*N) is O(M*N) since constant factors are irrelevant in
> assessing performance order?

Obviously that equivalence is true, but in this case I'm emphasizing
that it's even worse than that when constant factors are taken into
account. Big-O is nice in the abstract, but in the real-world those
constant factors can matter.

In pure big-O, it is indeed O(M*N) vs. O(N)
Including constant factors, the performance is roughly 2*M*N*X [X =
overhead of remove()] vs. N, which makes the badness of the algorithm
all the more apparent.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From loretta at fhv.at  Fri Feb 27 08:51:49 2009
From: loretta at fhv.at (Loretta SALINO)
Date: Fri, 27 Feb 2009 14:51:49 +0100
Subject: OT: handling multiple software repositories
References: <70npmbFgb464U1@mid.individual.net>
	<mailman.826.1235664617.11746.python-list@python.org>
Message-ID: <49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>

Tim Golden wrote:

> Thomas Guettler wrote:
>> Hi,
>> 
>> this is a bit off topic.
>> 
>> In our company we have several SVN repositories.
>> 
>> According to [1] Trac by default only handles one
>> repository.
>> 
>> Of course Trac links like changeset [1234] would not work anymore.
>> You would need [repro/1234] or something like this.
>> 
>> I think many (python) programmer have several repositories
>> and need to handle this somehow.
>> 
>> How do you do this?
>> 
>> I want a common wiki and a common bug tracker. It should
>> be possible to attach a bug to several repositories.
>> 
>> Up to now I don't use Trac, if someone has an alternative, please
>> tell me!
> 
> 
> Have a look at DrProject[1], a Trac-alike which handles
> multiple projects. (Not used it myself).
> 
> TJG
> 
> [1] https://www.drproject.org/

Good hint, thanks! I'm in the same situation and have been installing Trac
right these days. However, where is DrProject?

Following the links pointing to TGZs fails and installing from svn doesn't
work poperly (error messages about PyDispatcher). So, how did/do you
install DrProject?

Kind regards
Loretta






From andrei.avk at gmail.com  Fri Feb 27 08:57:34 2009
From: andrei.avk at gmail.com (Rainy)
Date: Fri, 27 Feb 2009 05:57:34 -0800 (PST)
Subject: ANN: updates to Python-by-example
Message-ID: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>

Python-by-example <a href="http://pbe.lightbird.net/index.html">http://
pbe.lightbird.net</a> has some new modules added: pickle, shelve,
sqlite3, gzip, csv, configparser, optparse, logging. I also changed
over to using excellent sphinx package to generate documentation, this
will allow me to add pdf and windows help formats soon (I ran into
some issues with that, actually). More modules coming soon, too! -AK


From ra.ravi.rav at gmail.com  Fri Feb 27 08:59:11 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Fri, 27 Feb 2009 05:59:11 -0800 (PST)
Subject: Make a python property with the same name as the class member name
Message-ID: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>

Is it possible in python to create a property with the same name as
the member variable name of the class. e.g.

Class X:
    ...
    self.i = 10 # marker
    ...
    property(fget = get_i, fset = set_i)

Please tell me how I can do so. Because if I do so, for the statement
at marker I get stack overflow for the assingm


From mail at timgolden.me.uk  Fri Feb 27 09:05:57 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 27 Feb 2009 14:05:57 +0000
Subject: OT: handling multiple software repositories
In-Reply-To: <49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>
References: <70npmbFgb464U1@mid.individual.net>	<mailman.826.1235664617.11746.python-list@python.org>
	<49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>
Message-ID: <49A7F345.7060402@timgolden.me.uk>

Loretta SALINO wrote:
> Tim Golden wrote:
> 
>> Thomas Guettler wrote:
>>> Hi,
>>>
>>> this is a bit off topic.
>>>
>>> In our company we have several SVN repositories.
>>>
>>> According to [1] Trac by default only handles one
>>> repository.
>>>
>>> Of course Trac links like changeset [1234] would not work anymore.
>>> You would need [repro/1234] or something like this.
>>>
>>> I think many (python) programmer have several repositories
>>> and need to handle this somehow.
>>>
>>> How do you do this?
>>>
>>> I want a common wiki and a common bug tracker. It should
>>> be possible to attach a bug to several repositories.
>>>
>>> Up to now I don't use Trac, if someone has an alternative, please
>>> tell me!
>>
>> Have a look at DrProject[1], a Trac-alike which handles
>> multiple projects. (Not used it myself).
>>
>> TJG
>>
>> [1] https://www.drproject.org/
> 
> Good hint, thanks! I'm in the same situation and have been installing Trac
> right these days. However, where is DrProject?
> 
> Following the links pointing to TGZs fails and installing from svn doesn't
> work poperly (error messages about PyDispatcher). So, how did/do you
> install DrProject?

I didn't, I'm afraid (cf above). Hopefully someone who has, or even
one of the maintainers, can chip in.

TJG


From et1ssgmiller at gmail.com  Fri Feb 27 09:12:30 2009
From: et1ssgmiller at gmail.com (Greg Miller)
Date: Fri, 27 Feb 2009 06:12:30 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
Message-ID: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>

I am working on a program that controls a piece of equipment.  The GUI/
control software is written with Python2.5/wxPython.  I would like to
know if there is a way of starting the GUI without the DOS window
having to launch?  I would like only the application itself to appear,
no DOS window.  Thanks for any information.
Greg Miller


From vlastimil.brom at gmail.com  Fri Feb 27 09:14:49 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 27 Feb 2009 15:14:49 +0100
Subject: TextCtrl fully expanding at program start
In-Reply-To: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
References: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
Message-ID: <9fdb569a0902270614k12a011bbu42394e0630b9e9a7@mail.gmail.com>

2009/2/27 alex <alecla at bluewin.ch>:
> Hi all
> I have a gridsizer consisting of two vertically stacked panels, one
> with a StaticBox and the other with a TextCtrl.
> I would like that the TextCtrl expands at program start fully to the
> allocated panel size (lower panel of gridSizer).
> Instead of like now, fully expanding in the width but not exapnding in
> the height direction (two lines high).
...
>

Hi,
changing the proportion for adding the textctrl into the sizer to 1
should expand it to the lower half of the panel.

try changing:
        windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)
TO:
        windowTwoSizer.Add(box2, 1, wx.ALL|wx.EXPAND, 0)

See
http://www.wxpython.org/docs/api/wx.Sizer-class.html#Add
for the options for adding into the sizer.

hth
   vbr


From eckhardt at satorlaser.com  Fri Feb 27 09:26:27 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 27 Feb 2009 15:26:27 +0100
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
Message-ID: <kp9l76-9p4.ln1@satorlaser.homedns.org>

Greg Miller wrote:
> I would like to know if there is a way of starting the GUI 
> without the DOS window having to launch?

Use pythonw.exe instead of python.exe.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From pruebauno at latinmail.com  Fri Feb 27 09:28:12 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 27 Feb 2009 06:28:12 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
Message-ID: <5db4e50e-6882-4c23-83cf-df50315896c0@a39g2000yqc.googlegroups.com>

On Feb 27, 9:12?am, Greg Miller <et1ssgmil... at gmail.com> wrote:
> I am working on a program that controls a piece of equipment. ?The GUI/
> control software is written with Python2.5/wxPython. ?I would like to
> know if there is a way of starting the GUI without the DOS window
> having to launch? ?I would like only the application itself to appear,
> no DOS window. ?Thanks for any information.
> Greg Miller

change the extension of your python program from ".py" to ".pyw".
Alternatively make sure that your program gets started by pythonw.exe
(insted of python.exe).


From python at bdurham.com  Fri Feb 27 09:40:27 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 27 Feb 2009 09:40:27 -0500
Subject: ANN: updates to Python-by-example
In-Reply-To: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
Message-ID: <1235745627.24512.1302731601@webmail.messagingengine.com>

Rainy,

Great stuff! Thanks for your examples with the community!!

Regards,
Malcolm


From gnewsg at gmail.com  Fri Feb 27 09:48:20 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 27 Feb 2009 06:48:20 -0800 (PST)
Subject: How can I know when a sub-process is effectively initialized?
References: <mailman.847.1235681981.11746.python-list@python.org>
Message-ID: <792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>

On 26 Feb, 21:59, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 26 Feb 2009 12:27:26 -0800 (PST), Giampaolo Rodola' <gne... at gmail.com> wrote:
> >Hi,
> >I'm working on a Python module called psutil [1] for reading process
> >information in a cross-platform way.
> >I'm having a problem with psutil test suite.
> >Almost all the test cases we implemented so far look like this:
>
> >def test_foo(self):
> > ? ?test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
> >stderr=DEVNULL)
> > ? ?time.sleep(0.1) ?# XXX: provisional, give some time the sub
> >process to initialize
> > ? ?p = psutil.Process(test_process.pid)
> > ? ?# start test here
> > ? ?...
>
> >As you can see we put a time.sleep(0.1) call after subprocess.Popen()
> >as a provisional workaround to let the sub process initialize
> >properly.
> >We're searching for some kind of way to know when the child process is
> >properly initialized so that we can actually start testing cases
> >without worries.
> >Does someone has an idea how could we do that?
>
> Hi Giampaolo,
>
> "Properly initialized" is application specific. ?Generally, what you want
> to do is have the child process tell you when it's ready. ?A common way
> to do this is for the child to write some bytes to a file descriptor the
> parent is monitoring when it is ready. ?The parent then just waits for
> those bytes. ?It looks like you entirely control the child in this case,
> so that should be possible here.
>
> Alternatively, maybe by "properly initialized" you mean something very
> specific about how subprocess.Popen creates processes. ?If so, can you
> elaborate a bit?
>
> Jean-Paul

By "properly initialized" I mean when I can actually start fetching
information from the process (e.g. name, path, parent pid, etc...).
Anyway, I came out with this solution:


def wait_for_pid(pid, timeout=1):
    """Wait for pid to show up in the process list then return.
    Used in the test suite to give time the sub process to initialize.
    """
    raise_at = time.time() + timeout
    while 1:
        if pid in psutil.get_pid_list():
            return
        time.sleep(0.0001)
        if time.time() >= raise_at:
            raise RuntimeError("Timed out")


def test_foo():
    proc = subprocess.Popen(PYTHON, stdout=DEVNULL, stderr=DEVNULL)
    wait_for_pid(proc.pid)
    ...


It seems to work fine on posix but we still got problems on Windows
where it seems that waiting for pid to show up in the system process
list is not enough for considering the process effectively
initialized.
Anyway, I think it's a problem in our code.
Thanks for your help, anyway.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From mail at timgolden.me.uk  Fri Feb 27 09:54:10 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 27 Feb 2009 14:54:10 +0000
Subject: How can I know when a sub-process is effectively initialized?
In-Reply-To: <792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>
References: <mailman.847.1235681981.11746.python-list@python.org>
	<792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>
Message-ID: <49A7FE92.2050705@timgolden.me.uk>

Giampaolo Rodola' wrote:
> It seems to work fine on posix but we still got problems on Windows
> where it seems that waiting for pid to show up in the system process
> list is not enough for considering the process effectively
> initialized.
> Anyway, I think it's a problem in our code.
> Thanks for your help, anyway.


On Windows, I'd just wait on a Windows event. The child process
sets it; the parent waits on it. If you need various of them,
the parent can pass a suitable id on the commandline to the
child. There are alternatives but this one is very easy to achieve.

TJG


From support.desk.ipg at gmail.com  Fri Feb 27 09:58:58 2009
From: support.desk.ipg at gmail.com (Support Desk)
Date: Fri, 27 Feb 2009 08:58:58 -0600
Subject: Capture Keystrokes from a USB Wireless Keyboard. 
In-Reply-To: <mailman.3364.1235745305.11745.python-list@python.org>
References: <mailman.3364.1235745305.11745.python-list@python.org>
Message-ID: <3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>



Does anybody know of a way to capture keystrokes form a wireless USB
keyboard using python?



From sgeiger at councilforeconed.org  Fri Feb 27 10:09:18 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Fri, 27 Feb 2009 10:09:18 -0500
Subject: Capture Keystrokes from a USB Wireless Keyboard.
In-Reply-To: <3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
References: <mailman.3364.1235745305.11745.python-list@python.org>
	<3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
Message-ID: <49A8021E.10200@councilforeconed.org>

Here's one option:

http://pykeylogger.sourceforge.net/wiki/index.php/PyKeylogger:FAQ                                                                                    



Support Desk wrote:
> Does anybody know of a way to capture keystrokes form a wireless USB
> keyboard using python?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From bearophileHUGS at lycos.com  Fri Feb 27 10:16:02 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 07:16:02 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
Message-ID: <9c2718dd-ee86-47d8-a47f-98c92b6a772e@d19g2000yqb.googlegroups.com>

Steve Holden:
> A sort of premature pessimization, then.

Maybe not, the save in memory may lead to higher speed anyway. So you
need to test it to know the overall balance. And in data structures
with general purpose you want all the speed you can get.

Bye,
bearophile


From support.desk.ipg at gmail.com  Fri Feb 27 10:19:35 2009
From: support.desk.ipg at gmail.com (Support Desk)
Date: Fri, 27 Feb 2009 09:19:35 -0600
Subject: Capture Keystrokes from a USB Wireless Keyboard.
In-Reply-To: <49A8021E.10200@councilforeconed.org>
References: <mailman.3364.1235745305.11745.python-list@python.org>
	<3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
	<49A8021E.10200@councilforeconed.org>
Message-ID: <D29BF8FE0E334953B68FE51ACDA78A24@office.ipglobal.net>

Thanks, I'm looking for something I can integrate into a simple game I'm
working on that will run in Linux. 

-----Original Message-----
From: Shane Geiger [mailto:sgeiger at councilforeconed.org] 
Sent: Friday, February 27, 2009 9:09 AM
To: Support Desk
Cc: python-list at python.org
Subject: Re: Capture Keystrokes from a USB Wireless Keyboard.

Here's one option:

http://pykeylogger.sourceforge.net/wiki/index.php/PyKeylogger:FAQ




Support Desk wrote:
> Does anybody know of a way to capture keystrokes form a wireless USB
> keyboard using python?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From vlastimil.brom at gmail.com  Fri Feb 27 10:19:55 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 27 Feb 2009 16:19:55 +0100
Subject: starting a Python 2.5 executable without the DOS window
In-Reply-To: <228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com>
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
	<9fdb569a0902270621r279e7fb7kf75281d74a8415a2@mail.gmail.com>
	<228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com>
Message-ID: <9fdb569a0902270719y40e9d2c2m2385e5b75d94cfb1@mail.gmail.com>

>> 2009/2/27 Greg Miller <et1ssgmiller at gmail.com>:
>> > I am working on a program that controls a piece of equipment. ?The GUI/
>> > control software is written with Python2.5/wxPython. ?I would like to
>> > know if there is a way of starting the GUI without the DOS window
>> > having to launch? ?I would like only the application itself to appear,
>> > no DOS window. ?Thanks for any information.
>> > Greg Miller
>> > --

2009/2/27 Greg Miller <et1ssgmiller at gmail.com>:
> Sorry, I should have been a bit more specific, it is an executable, .exe,
> application created with PytoExe.
>

Ok, then you can adjust your setup script for py2exe to contain

setup(windows=["sourcefile.py"] ... )

instead of

setup(console=["sourcefile.py"] ...) which you probably have now.

hth,
  vbr


From digitig at gmail.com  Fri Feb 27 10:33:54 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 27 Feb 2009 15:33:54 +0000
Subject: removing duplication from a huge list.
In-Reply-To: <b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
Message-ID: <aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>

2009/2/27 odeits <odeits at gmail.com>:

> How big of a list are we talking about? If the list is so big that the
> entire list cannot fit in memory at the same time this approach wont
> work e.g. removing duplicate lines from a very large file.

We were told in the original question: more than 15 million records,
and it won't all fit into memory. So your observation is pertinent.

-- 
Tim Rowe


From steven.oldner at gmail.com  Fri Feb 27 10:35:08 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Fri, 27 Feb 2009 07:35:08 -0800 (PST)
Subject: ANN: updates to Python-by-example
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
	<mailman.903.1235745632.11746.python-list@python.org>
Message-ID: <49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>

On Feb 27, 8:40?am, pyt... at bdurham.com wrote:
> Rainy,
>
> Great stuff! Thanks for your examples with the community!!
>
> Regards,
> Malcolm

Let me add my thanks!  I using it now...


From stefan_ml at behnel.de  Fri Feb 27 10:38:31 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 27 Feb 2009 16:38:31 +0100
Subject: How to parse form in client side?
In-Reply-To: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
References: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
Message-ID: <49a808f7$0$32681$9b4e6d93@newsspool2.arcor-online.net>

Muddy Coder wrote:
> cgi module can easily acquire the all fields of data input from client
> side, through a form. Then, a simple line of code:
> 
> form_dict = cgi.FieldStorage()
> 
> grabs all data into a dictionary form_dict. The rest becomes a piece
> of cake by querying the form_dict. Nice!
> 
> However, it is done in the server side. Now I want to do the same in
> the client side. first of all, I get the source code of a HTML form by
> using urllib, from server, with code below:
> 
> html_source = urllib.urlopen(URL).read()
> 
> Then, I need to parse this html_source file, at client side. Is there
> a module to handle this? Can somebody help? Thanks!

lxml.html has good form handling support:

http://codespeak.net/lxml/lxmlhtml.html#forms

Stefan


From lilhedges69 at yahoo.com  Fri Feb 27 11:07:03 2009
From: lilhedges69 at yahoo.com (Brett Hedges)
Date: Fri, 27 Feb 2009 08:07:03 -0800 (PST)
Subject: Using xreadlines
In-Reply-To: <82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>
Message-ID: <830721.69929.qm@web30703.mail.mud.yahoo.com>


> You can also keep track of the absolute position of the lines in the file, etc, or step back looking for newlines, etc, but it's not handy.


How would I keep track of the absolute position of the lines? I have tried to use the files.seek() command with the files.tell() command and it does not seem to work. The files.tell() command seems to give me a number but when I use the files.next() command with xreadlines it does not change the line number the next time I use files.tell(). 

Thanks,

Brett

--- On Thu, 2/26/09, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:

> From: bearophileHUGS at lycos.com <bearophileHUGS at lycos.com>
> Subject: Re: Using xreadlines
> To: python-list at python.org
> Date: Thursday, February 26, 2009, 8:09 PM
> Brett Hedges:
> > My question is how do I go to a previous line in the
> file? xreadlines has a file.next() statement that gives the
> next line, and I need a statement that gives me the previous
> line.<
> 
> In modern versions of Python you usually don't need
> xreadlines,
> because files are iterable.
> 
> If your files are small, you can just read all the lines in
> a list
> with open(...).readlines(), and then just use the item of
> the list
> with the n-1 index.
> 
> If the file is quite large or you like to keep things lazy,
> then you
> have to keep memory of the previous line, using an
> auxiliary variable.
> You can also wrap this idiom into a generator function (or
> iterable
> class, probably) that yields items and keeps memory of the
> last one
> (but you can't ask the previous of the first item, of
> course).
> 
> You can also keep track of the absolute position of the
> lines in the
> file, etc, or step back looking for newlines, etc, but
> it's not handy.
> 
> Bye,
> bearophile
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From clp2 at rebertia.com  Fri Feb 27 11:43:15 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 08:43:15 -0800
Subject: Make a python property with the same name as the class member 
	name
In-Reply-To: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>
References: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902270843j5d0dce8flafcdd7b7494474b2@mail.gmail.com>

On Fri, Feb 27, 2009 at 5:59 AM, Ravi <ra.ravi.rav at gmail.com> wrote:
> Is it possible in python to create a property with the same name as
> the member variable name of the class. e.g.

No, because accessing the property and the instance variable are
*syntactically identical* (it's the raison detre of properties) so
there's no way for Python to know which one you mean when.
Typically, people name the variable used internally by the property as
an underscore followed by the property name (e.g. self._i).

> Class X:
> ? ?...
> ? ?self.i = 10 # marker
> ? ?...
> ? ?property(fget = get_i, fset = set_i)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bearophileHUGS at lycos.com  Fri Feb 27 11:43:43 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 08:43:43 -0800 (PST)
Subject: Using xreadlines
References: <mailman.910.1235750828.11746.python-list@python.org>
Message-ID: <cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>

Brett Hedges:
> How would I keep track of the absolute position of the lines?

You may have to do all things manually (tell, seek and looking for
newlines manually, iterating chars), that's why I have said it's not
handy. The other solutions are simpler.

Bye,
bearophile


From garrickp at gmail.com  Fri Feb 27 11:55:50 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 27 Feb 2009 08:55:50 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<mailman.909.1235748837.11746.python-list@python.org>
Message-ID: <50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>

On Feb 27, 8:33?am, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/27 odeits <ode... at gmail.com>:
>
> > How big of a list are we talking about? If the list is so big that the
> > entire list cannot fit in memory at the same time this approach wont
> > work e.g. removing duplicate lines from a very large file.
>
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.
>
> --
> Tim Rowe

If order did matter, and the list itself couldn't be stored in memory,
I would personally do some sort of hash of each item (or something as
simple as first 5 bytes, last 5 bytes and length), keeping a reference
to which item the hash belongs, sort and identify duplicates in the
hash, and using the reference check to see if the actual items in
question match as well.

Pretty brutish and slow, but it's the first algorithm which comes to
mind. Of course, I'm assuming that the list items are long enough to
warrant using a hash and not the values themselves.

~G


From mkhitrov at gmail.com  Fri Feb 27 12:00:50 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 27 Feb 2009 12:00:50 -0500
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
In-Reply-To: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
	<op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <26ddd1750902270900s5fc3d3aq3b8565acd2d95b98@mail.gmail.com>

On Thu, Feb 26, 2009 at 3:47 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
>> I'm looking for a function in the standard library or pywin32 package
>> that will block until a certain condition is met or it is interrupted
>> by Ctrl-C. For example, time.sleep() would have been perfect for my
>> needs if thread.interrupt_main() could interrupt the call from another
>> thread in the same way that Ctrl-C does. Unfortunately, that is not
>> the case.
>
> You may try MsgWaitForMultipleObjects - send a message to the main thread
> from the other thread.
> An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,
> but I've never actually tried in Python.

I tried using MsgWaitForMultipleObjects, but even with a wake mask of
0xffff Ctrl-C still did not interrupt the call. Maybe it has to do
with the way pywin32 implements it. QueueUserAPC is not available in
pywin32, but I suppose I can try getting to it via ctypes.

- Max


From starsareblueandfaraway at gmail.com  Fri Feb 27 12:03:38 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Fri, 27 Feb 2009 12:03:38 -0500
Subject: Using xreadlines
In-Reply-To: <cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>
References: <mailman.910.1235750828.11746.python-list@python.org>
	<cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>
Message-ID: <6a5569ec0902270903p1f2f6a54ta2bc7502565d3561@mail.gmail.com>

Brett,

I'm not sure what exactly you're trying to do, but you can keep track
of line numbers using itertools.

import itertools
for lineIndex, line in itertools.izip(itertools.count(1), open('text.txt')):
    print lineIndex, line


Here is sample code for breaking on a word and returning the previous line

def breakOnWord(filePath, word):
    previousLine = ''
    for line in open(filePath):
        if word in line:
            return previousLine
        previousLine = line



On Fri, Feb 27, 2009 at 11:43 AM,  <bearophileHUGS at lycos.com> wrote:
> Brett Hedges:
>> How would I keep track of the absolute position of the lines?
>
> You may have to do all things manually (tell, seek and looking for
> newlines manually, iterating chars), that's why I have said it's not
> handy. The other solutions are simpler.
>
> Bye,
> bearophile
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Fri Feb 27 12:07:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 12:07:41 -0500
Subject: removing duplication from a huge list.
In-Reply-To: <50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
Message-ID: <go96m9$t4i$1@ger.gmane.org>

Falcolas wrote:
> On Feb 27, 8:33 am, Tim Rowe <digi... at gmail.com> wrote:
>> 2009/2/27 odeits <ode... at gmail.com>:
>>
>>> How big of a list are we talking about? If the list is so big that the
>>> entire list cannot fit in memory at the same time this approach wont
>>> work e.g. removing duplicate lines from a very large file.
>> We were told in the original question: more than 15 million records,
>> and it won't all fit into memory. So your observation is pertinent.
>>
>> --
>> Tim Rowe
> 
> If order did matter, and the list itself couldn't be stored in memory,
> I would personally do some sort of hash of each item (or something as
> simple as first 5 bytes, last 5 bytes and length), keeping a reference
> to which item the hash belongs, sort and identify duplicates in the
> hash, and using the reference check to see if the actual items in
> question match as well.
> 
Assuming no duplicates, how does this help? You still have to verify
collisions.

> Pretty brutish and slow, but it's the first algorithm which comes to
> mind. Of course, I'm assuming that the list items are long enough to
> warrant using a hash and not the values themselves.
> 
The problem is you can't guarantee any hash value will be unique, so
ultimately you have to check whether list entries hashing to the same
value are or are not equal. Which would mean either having the whole
list in memory or having access to it via some other random access method.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Scott.Daniels at Acm.Org  Fri Feb 27 12:20:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 27 Feb 2009 09:20:19 -0800
Subject: Using xreadlines
In-Reply-To: <mailman.910.1235750828.11746.python-list@python.org>
References: <mailman.910.1235750828.11746.python-list@python.org>
Message-ID: <MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>

(1) Please do not top post in comp.lang.python, it violates conventions.

Brett Hedges (should have written):
 > bearophile wrote: ...
>> You can also keep track of the absolute position of the lines in the file, etc, or step 
 >> back looking for newlines, etc, but it's not handy....
> 
> How would I keep track of the absolute position of the lines? 
 > I have tried to use the files.seek() command with the files.tell()
 > command and it does not seem to work. The files.tell() command seems
 >  to give me a number but when I use the files.next() command with
 > xreadlines it does not change the line number the next time I use
 > files.tell().

The answer to your question depends on what version of Python you are
running.  Give python version and platform to any question when you
don't _know_ they are irrelevant.

If you want an answer without any other input, try this:

The simplest way to solve this for the moment is (re)defining
xreadlines:

     def xreadlines(source):
         for line in iter(src.readline, ''):
             yield line

--Scott David Daniels
Scott.Daniels at Acm.Org


From patrick.oloughlin at gmail.com  Fri Feb 27 12:22:21 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 27 Feb 2009 17:22:21 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.834.1235672099.11746.python-list@python.org>
	<e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>
Message-ID: <cc34a9320902270922h5c15008n29cd76985aa787cf@mail.gmail.com>

2009/2/27 venutaurus539 at gmail.com <venutaurus539 at gmail.com>:
> Thanks for the reply,,
> ? ? ? ? ? ?I am trying to use the above application using psexec()in
> command line.But it failed returning the error message
>
> ?exited with error code 255.
>
> ? ? ? ? ? ? ?But when I ran the application normally it worked
> fine.Do I need to add anything to my python script(either the main one
> or the script which is calling it) to make it work.

I don't have any experience with psexec, so I'm not sure if I can help
you with that.
I assume this means that you are trying to run the script on a remote
computer? (Elsewise, why use psexec?)

I took a look at it though and it seems that it always exits with
*some* error code. I think it's more usual for that error code to be
zero, though (it does when I run it on my machine).

You might try "psexec start script1.py", which might work if you've
successfully set Explorer to run .py files with python.exe when you
double-click on them.

"psexec python script1.py" will work if the python.exe is in the correct path.

You can also specify the full path to your python.exe. if you know it
e.g.: "psexec C:\python25\python.exe script1.py"



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From python.list at tim.thechases.com  Fri Feb 27 12:30:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 27 Feb 2009 11:30:45 -0600
Subject: removing duplication from a huge list.
In-Reply-To: <aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>
Message-ID: <49A82345.1040101@tim.thechases.com>

>> How big of a list are we talking about? If the list is so big that the
>> entire list cannot fit in memory at the same time this approach wont
>> work e.g. removing duplicate lines from a very large file.
> 
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.

Assuming the working set of unique items will still fit within 
memory, it can be done with the following regardless of the 
input-file's size:

   def deduplicator(iterable):
     seen = set()
     for item in iterable:
       if item not in seen:
         seen.add(item)
         yield item

   s = [7,6,5,4,3,6,9,5,4,3,2,5,4,3,2,1]
   print list(deduplicator(s))

   for line in deduplicator(file('huge_test.txt')):
     print line


It maintains order, emitting only new items as they're encountered.

-tkc





From ethan at stoneleaf.us  Fri Feb 27 12:34:11 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 27 Feb 2009 09:34:11 -0800
Subject: pep 8 constants
In-Reply-To: <go2fk5$bh6$1@ger.gmane.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<49A49644.80509@stoneleaf.us>	<op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
	<go2fk5$bh6$1@ger.gmane.org>
Message-ID: <49A82413.8080609@stoneleaf.us>

Steve Holden wrote:
> Gabriel Genellina wrote:
> 
>>En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>
>>escribi?:
>>
>>
>>>Steve Holden wrote:
>>>
>>>>Brian Allen Vanderburg II wrote:
>>>>
>>>>
>>>>>One idea to make constants possible would be to extend properties to be
>>>>>able to exist at the module level as well as the class level:
>>>>>
>>>>>@property
>>>>>def pi():
>>>>>  return 3.14159.....
>>>>>
>>>>>print(pi) # prints 3.14159....
>>>>>pi=32 # Raise an error Cannot set attribute ...
>>>>>
>>>>
>>>> I don't understand why this would print 3.14159 ... instead of
>>>><function
>>>>__math__.pi>, or whatever.
>>>> property would clearly have to do something very different in module
>>>>scope in order to make this work.
>>>> regards
>>>> Steve
>>>
>>>--> class tester(object):
>>>...   @property
>>>...   def pi(self):
>>>...     return 3.141596
>>>...
>>>--> testee = tester()
>>>--> testee.pi
>>>3.1415959999999998
>>>
>>>Looks like that's how property works, so the same behavior on a module
>>>level would do as Brian suggests.
>>
>>Note that:
>> - you defined the property inside the *class* tester
>> - then, you created an *instance* of such class
>> - you retrieve pi from the instance
>> - if you retrieve pi from the class (tester.pi), you get a property
>>object, not a float.
>> - if you directly attach the property to the instance, testee.pi
>>returns a property object, not a float.
>>Finally, consider that modules are instances of type `module`; all
>>modules are instances of the same type.
>>
>>How do you propose to make properties work at the module level?
>>
> 
> Thanks, Gabriel. I was beginning to think there was something terribly
> obvious I had completely missed.
> 
> regards
>  Steve

Yes, Thanks, Gabriel!

You're extra comments made clarified the issue for me.  Much appreciated.

~Ethan~


From pcooke at philc.net  Fri Feb 27 12:35:06 2009
From: pcooke at philc.net (PhilC)
Date: Fri, 27 Feb 2009 12:35:06 -0500
Subject: Marching Cubes example
Message-ID: <v58gq4ho42jnej76ecq42fh9m7576gj41s@4ax.com>

Does anyone know of sample code showing how the marching cubes
algorithm may be implimented using Python?

Ref:- http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/

I can set up the cubes and test to see if their vertices are inside
the isosurface.

I can produce a resulting "metaball" but definition is poor and some
faces are reversed. (but not in any pattern that I can effectivly
debug).

My particular issues are:-

1) Finding the point at which the isosurface cuts the cube being
tested. Using a mid point produces poor results.

2) Getting the resulting triangular faces to all face outwards.

I'd prefer not to get into using VTK or matlab if possible.

Thanks :)



From digitig at gmail.com  Fri Feb 27 12:54:21 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 27 Feb 2009 17:54:21 +0000
Subject: removing duplication from a huge list.
In-Reply-To: <go96m9$t4i$1@ger.gmane.org>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
	<go96m9$t4i$1@ger.gmane.org>
Message-ID: <aee48b3c0902270954p45644757h508458910a8ffe8d@mail.gmail.com>

2009/2/27 Steve Holden <steve at holdenweb.com>:

> Assuming no duplicates, how does this help? You still have to verify
> collisions.
>
>> Pretty brutish and slow, but it's the first algorithm which comes to
>> mind. Of course, I'm assuming that the list items are long enough to
>> warrant using a hash and not the values themselves.
>>
> The problem is you can't guarantee any hash value will be unique, so
> ultimately you have to check whether list entries hashing to the same
> value are or are not equal. Which would mean either having the whole
> list in memory or having access to it via some other random access method.

You don't need random access to the whole list, just to the records
that collide on a hash. although you do end up using the external
storage as random access, which can be very slow, you've possibly
drastically reduced the number of such random accesses, which should
be a big saving. The best case is if the number of collisions is low
enough for the random access to be dealt with in buffering, avoiding
wasteful seeks of the external storage, in which case it's a complete
win. Remember that if the identical hashes are not collisions but
genuine duplicates you can throw them away as soon as they're checked,
so with some clever buffering you can stop them from clogging up the
buffer. The worst case is if there are a lot of genuine collisions, in
which case it's probably not a very good hash.

-- 
Tim Rowe


From daniel.watrous at gmail.com  Fri Feb 27 13:14:35 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 27 Feb 2009 10:14:35 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
	<9fdb569a0902270621r279e7fb7kf75281d74a8415a2@mail.gmail.com> 
	<228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com> 
	<mailman.907.1235748001.11746.python-list@python.org>
Message-ID: <87db03a9-e384-4c33-9965-6f5c4f787b65@p11g2000yqe.googlegroups.com>

On Feb 27, 8:19?am, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:
> >> 2009/2/27 Greg Miller <et1ssgmil... at gmail.com>:
> >> > I am working on a program that controls a piece of equipment. ?The GUI/
> >> > control software is written with Python2.5/wxPython. ?I would like to
> >> > know if there is a way of starting the GUI without the DOS window
> >> > having to launch? ?I would like only the application itself to appear,
> >> > no DOS window. ?Thanks for any information.
> >> > Greg Miller
> >> > --
>
> 2009/2/27 Greg Miller <et1ssgmil... at gmail.com>:
>
> > Sorry, I should have been a bit more specific, it is an executable, .exe,
> > application created with PytoExe.
>
> Ok, then you can adjust your setup script for py2exe to contain
>
> setup(windows=["sourcefile.py"] ... )
>
> instead of
>
> setup(console=["sourcefile.py"] ...) which you probably have now.
>
> hth,
> ? vbr

Just giving it the .pyw extension also seems to work (as I remember)


From alecla at bluewin.ch  Fri Feb 27 13:39:55 2009
From: alecla at bluewin.ch (alex)
Date: Fri, 27 Feb 2009 10:39:55 -0800 (PST)
Subject: TextCtrl fully expanding at program start
References: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
	<mailman.902.1235744095.11746.python-list@python.org>
Message-ID: <ee63ccea-ed71-475d-a678-de53beca7733@z9g2000yqi.googlegroups.com>

On 27 Feb., 15:14, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:
> 2009/2/27 alex <ale... at bluewin.ch>:
>
> > Hi all
> > I have a gridsizer consisting of two vertically stacked panels, one
> > with a StaticBox and the other with a TextCtrl.
> > I would like that the TextCtrl expands at program start fully to the
> > allocated panel size (lower panel of gridSizer).
> > Instead of like now, fully expanding in the width but not exapnding in
> > the height direction (two lines high).
> ...
>
> Hi,
> changing the proportion for adding the textctrl into the sizer to 1
> should expand it to the lower half of the panel.
>
> try changing:
> ? ? ? ? windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)
> TO:
> ? ? ? ? windowTwoSizer.Add(box2, 1, wx.ALL|wx.EXPAND, 0)
>
> Seehttp://www.wxpython.org/docs/api/wx.Sizer-class.html#Add
> for the options for adding into the sizer.
>
> hth
> ? ?vbr

Hi Vlastimil
I must have overlooked it. Too much reading and trying...
Thank you, it works perfect.

Regards Alex


From garrickp at gmail.com  Fri Feb 27 15:01:29 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 27 Feb 2009 12:01:29 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
	<mailman.914.1235754520.11746.python-list@python.org>
Message-ID: <364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>

On Feb 27, 10:07?am, Steve Holden <st... at holdenweb.com> wrote:
> Assuming no duplicates, how does this help? You still have to verify
> collisions.

Absolutely. But a decent hashing function (particularly since you know
quite a bit about the data beforehand) will have very few collisions
(theoretically no collisions, again since we know the data
beforehand).

> The problem is you can't guarantee any hash value will be unique, so
> ultimately you have to check whether list entries hashing to the same
> value are or are not equal. Which would mean either having the whole
> list in memory or having access to it via some other random access method.

Again, absolutely. But as Tim pointed out, with a decent hash the
number of superfluous checks should be minimal, so your checks will
mostly occur on valid duplicate values.

It's worth noting that I picked this algorithm with the assumption
that any storage to physical memory (such as required by using a set)
would be out of the question.

~G


From rpdooling at gmail.com  Fri Feb 27 15:04:15 2009
From: rpdooling at gmail.com (Rick Dooling)
Date: Fri, 27 Feb 2009 12:04:15 -0800 (PST)
Subject: Data Coding suggestions
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
Message-ID: <477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>

On Feb 27, 6:42?am, "steven.oldner" <steven.old... at gmail.com> wrote:
> Just learning Python and have a project to create a weekly menu and a
> shopping list from the menu. ?

> Question: ?How should I set up the data? ?I'm looking at maybe 70 menu
> items and maybe 1000 items for the shopping list. ?I need to be able
> to maintain each item also.
>

I agree with Mr. Holden. It's a perfect exercise for using Python with
sqlite3.

And the nice thing about this documentation is it has plenty of good
examples:

http://docs.python.org/library/sqlite3.html

Good luck,

RD


From starsareblueandfaraway at gmail.com  Fri Feb 27 15:04:43 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Fri, 27 Feb 2009 15:04:43 -0500
Subject: Using xreadlines
In-Reply-To: <MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>
References: <mailman.910.1235750828.11746.python-list@python.org>
	<MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>
Message-ID: <6a5569ec0902271204j39c86ff9hdf3464918d7a5d93@mail.gmail.com>

On Fri, Feb 27, 2009 at 12:20 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> (1) Please do not top post in comp.lang.python, it violates conventions.
>
> Brett Hedges (should have written):
>> bearophile wrote: ...
>>>
>>> You can also keep track of the absolute position of the lines in the
>>> file, etc, or step
>
>>> back looking for newlines, etc, but it's not handy....
>>
>> How would I keep track of the absolute position of the lines?
>
>> I have tried to use the files.seek() command with the files.tell()
>> command and it does not seem to work. The files.tell() command seems
>> ?to give me a number but when I use the files.next() command with
>> xreadlines it does not change the line number the next time I use
>> files.tell().
>
> The answer to your question depends on what version of Python you are
> running. ?Give python version and platform to any question when you
> don't _know_ they are irrelevant.
>
> If you want an answer without any other input, try this:
>
> The simplest way to solve this for the moment is (re)defining
> xreadlines:
>
> ? ?def xreadlines(source):
> ? ? ? ?for line in iter(src.readline, ''):
> ? ? ? ? ? ?yield line
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Sorry for top-posting.
http://en.wikipedia.org/wiki/Posting_style


From steve at holdenweb.com  Fri Feb 27 15:31:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 15:31:51 -0500
Subject: removing duplication from a huge list.
In-Reply-To: <364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>	<mailman.914.1235754520.11746.python-list@python.org>
	<364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>
Message-ID: <go9il6$8nl$1@ger.gmane.org>

Falcolas wrote:
> On Feb 27, 10:07 am, Steve Holden <st... at holdenweb.com> wrote:
>> Assuming no duplicates, how does this help? You still have to verify
>> collisions.
> 
> Absolutely. But a decent hashing function (particularly since you know
> quite a bit about the data beforehand) will have very few collisions
> (theoretically no collisions, again since we know the data
> beforehand).
> 
>> The problem is you can't guarantee any hash value will be unique, so
>> ultimately you have to check whether list entries hashing to the same
>> value are or are not equal. Which would mean either having the whole
>> list in memory or having access to it via some other random access method.
> 
> Again, absolutely. But as Tim pointed out, with a decent hash the
> number of superfluous checks should be minimal, so your checks will
> mostly occur on valid duplicate values.
> 
> It's worth noting that I picked this algorithm with the assumption
> that any storage to physical memory (such as required by using a set)
> would be out of the question.
> 
I take your point about the relatively rare collisions. Devising a
zero-collision algorithm is far from trivial, since at the minimum it
requires storing all hashes in a set to verify each new hash doesn't
collide with previous ones.

But unless you can *guarantee* zero collisions you do still need a
mapping from hash values to the original data, since this is the only
way to determine whether collisions represent a duplicate value or not.
That's not a trivial detail for fifteen million values, though it
depends some on the format of the OP's "records". I suppose a list of
file positions stored with each hash might be usable assuming either
fixed-length or properly delimited records.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From fredbasset1000 at gmail.com  Fri Feb 27 15:54:58 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Fri, 27 Feb 2009 12:54:58 -0800 (PST)
Subject: Define a constant in Python C extension
Message-ID: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>

I'm writing a C extension for Python, is it possible to define
constants in the C code and have them visible from Python?


From robert.kern at gmail.com  Fri Feb 27 16:03:39 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 27 Feb 2009 15:03:39 -0600
Subject: Define a constant in Python C extension
In-Reply-To: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <go9kfc$eie$1@ger.gmane.org>

On 2009-02-27 14:54, fredbasset1000 at gmail.com wrote:
> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

In your init<module> function, create Python objects from the constants 
and insert them into the module using PyModule_AddObject(). The 
initspam() function in this section does this (though not with #defined 
constants):

http://docs.python.org/extending/extending.html#providing-a-c-api-for-an-extension-module

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though 
it had
  an underlying truth."
   -- Umberto Eco



From mwilson at the-wire.com  Fri Feb 27 16:15:18 2009
From: mwilson at the-wire.com (Mel)
Date: Fri, 27 Feb 2009 16:15:18 -0500
Subject: Define a constant in Python C extension
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <go9l4o$21nu$1@services.telesweet.net>

fredbasset1000 at gmail.com wrote:

> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

There's an API function to create a module-level name with a given value,
e.g.

PyModule_AddIntConstant (module, "S_IRUSR", S_IRUSR);   // user read

In this example, S_IRUSR was defined in one of the .h files for the
functions being wrapped.

        Mel.



From ntwrkd at gmail.com  Fri Feb 27 17:08:22 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Fri, 27 Feb 2009 14:08:22 -0800
Subject: Guidance on writing a top-like console
Message-ID: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>

I am interested in writing an application that functions like a Unix
or Linux top in the way it displays data.
It should be command-line based but dynamically refreshing.

I'm not sure what I should take into account or how I might go about
implementing this?
Any suggestions are appreciated.


From http  Fri Feb 27 17:18:36 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 14:18:36 -0800
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
Message-ID: <7xprh3ikw3.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.

That is not terribly many records by today's standards.  The knee-jerk
approach is to sort them externally, then make a linear pass skipping
the duplicates.  Is the exercise to write an external sort in Python?
It's worth doing if you've never done it before.


From http  Fri Feb 27 17:19:24 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 14:19:24 -0800
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <7xljrrikur.fsf@ruckus.brouhaha.com>

ntwrkd <ntwrkd at gmail.com> writes:
> I'm not sure what I should take into account or how I might go about
> implementing this?

Maybe the curses module.  http://docs.python.org/library/curses.html


From kyosohma at gmail.com  Fri Feb 27 17:20:27 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 27 Feb 2009 14:20:27 -0800 (PST)
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <3cd95fd8-c975-425f-b01a-141bad52b408@q11g2000yqh.googlegroups.com>

On Feb 27, 4:08?pm, ntwrkd <ntw... at gmail.com> wrote:
> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.
>
> I'm not sure what I should take into account or how I might go about
> implementing this?
> Any suggestions are appreciated.

Perhaps you're looking for the curses module?

http://www.amk.ca/python/howto/curses/

Mike


From python.list at tim.thechases.com  Fri Feb 27 17:35:14 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 27 Feb 2009 16:35:14 -0600
Subject: Guidance on writing a top-like console
In-Reply-To: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
References: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
Message-ID: <49A86AA2.30304@tim.thechases.com>

> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.

You might look at the sourcecode for "iotop"[1] which would make 
a good example (it's a "top"-like program written in Python, used 
for monitoring I/O transactions on a per-process basis)

-tkc


[1]
http://guichaz.free.fr/iotop/







From ntwrkd at gmail.com  Fri Feb 27 17:38:59 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Fri, 27 Feb 2009 14:38:59 -0800
Subject: Guidance on writing a top-like console
In-Reply-To: <49A86AA2.30304@tim.thechases.com>
References: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
	<49A86AA2.30304@tim.thechases.com>
Message-ID: <f257b9ab0902271438t11b948ablef40bc60e9246a3e@mail.gmail.com>

Thanks. These are all great suggestions.

On Fri, Feb 27, 2009 at 2:35 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
>> I am interested in writing an application that functions like a Unix
>> or Linux top in the way it displays data.
>> It should be command-line based but dynamically refreshing.
>
> You might look at the sourcecode for "iotop"[1] which would make a good
> example (it's a "top"-like program written in Python, used for monitoring
> I/O transactions on a per-process basis)
>
> -tkc
>
>
> [1]
> http://guichaz.free.fr/iotop/
>
>
>
>
>
>


From mmcclaf at gmail.com  Fri Feb 27 18:39:13 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 27 Feb 2009 15:39:13 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
	<mailman.894.1235739864.11746.python-list@python.org>
Message-ID: <efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com>

This came in the Python groups, and I put one up in the database
group, since I will later have to use Python to access the SQL file,
so therefore tackling one thing at a time. Also, there were no answers
that were coming up in the .database group.

On top of that:
>        Really? You can have ships in the Outcomes relation that DO NOT
>APPEAR in the Ships relation... Goodbye referential integrity.
>
>        Besides which, if they don't appear in the Ships relation, then
>there is NO INFORMATION to tell you what ship CLASS it is a member of --
>do you group them all as "UNKNOWN" class, or do you declare each to be
>the only ship of its class (and thereby use the ship name as the class
>name)?

This meant that some ships weren't listed in the Ship table provided
but did show up in the Outcome. Therefore, they are not directly
referenced one to the other.

>        <sigh> Another gmail user found only by back referencing responses...

What is meant by this statement?

So in short of the responses given, I need to study further: GROUP BY,
HAVING, AS, COUNT, and subselect queries, right?

The relational algebra, I am able to translate it into SQL, or most of
it, meaning turning it into the queries of SQL. This is not an
advanced database course, but more a basic intro to database systems.


From vinay_sajip at yahoo.co.uk  Fri Feb 27 18:48:39 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 27 Feb 2009 15:48:39 -0800 (PST)
Subject: logging.Handler not working with QThreads
References: <mailman.776.1235606253.11746.python-list@python.org>
Message-ID: <d798715f-5a10-49e7-952c-62e4b3b2f6ac@33g2000yqm.googlegroups.com>

On Feb 25, 11:57?pm, Lukas Hetzenecker <L... at gmx.at> wrote:
> Hello,
>
> I created a QTextEdit where I wanted to display log messages.
> A logging.Handler should do this job.
>
> It worked with one thread well, but when I start a QThread the text on all
> widgets is removed and I get many errors in my konsole:
>
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
>
> .. and so on
>
> I attatched a small example to this mail.
>
> Could anybody tell me what I'm doing wrong?
> Thanks for you help,
> Lukas
>
> ?logging_error.py
> 3KViewDownload

I'm not sure what exactly your problem is - I had no problem running a
slightly modified version of your script. I don't have a version of Qt
with a QPlainTextEdit, so I used a plain QTextEdit instead ('scuse the
play on words). I also modified the thread run method slightly, like
so...

   def run(self):
      s = self.currentThreadId()
      for i in range(10):
          self.log.info("Thread %s (%d)", s, i)
          self.sleep(1)

With these changes (and replacing the appendPlainText with just plain
append, the script worked fine. I was able to get messages from
multiple running threads and the main window/log window into the
single QTextEdit.

My testing was conducted on Kubuntu Hardy with SIP 4.7.9 and PyQt
4.4.4. The modified script is at

http://dpaste.com/hold/2947/

Best regards,

Vinay Sajip


From ethan at stoneleaf.us  Fri Feb 27 18:55:43 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 27 Feb 2009 15:55:43 -0800
Subject: why cannot assign to function call
In-Reply-To: <slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
References: <mailman.6353.1230595599.3487.python-list@python.org>	<gjtj6a$8ud$1@ger.gmane.org>	<mailman.6612.1231183278.3487.python-list@python.org>	<01728080$0$8693$c3e8da3@news.astraweb.com>	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>	<01771716$0$8693$c3e8da3@news.astraweb.com>	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>	<0178651d$0$8693$c3e8da3@news.astraweb.com>	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
Message-ID: <49A87D7F.8090500@stoneleaf.us>

Mark Wooding wrote:
> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
 >
>>On the one hand, some people (me and possibly rurpy) consider "this is 
>>pass-by-foo" to be a statement about behaviour directly visible to the 
>>programmer. We have a set of behavioral traits in mind, and if a language 
>>exhibits those behaviours, then it is clearly and obviously pass-by-foo 
>>no matter how that behaviour is implemented. I'll call these the 
>>behaviorists.
> 
> Here's the problem.  I think I'm in that camp too!
> 
> I'm going to move away from the formal semantics stuff and try a
> different tack.  Here's what I think is the defining property of
> pass-by-value (distilled from the formal approach I described earlier,
> but shorn of the symbolism):
> 
>   The callee's parameters are /new variables/, initialized /as if by
>   assignment/ from the values of caller's argument expressions.
 >
> My soundbite definition for pass-by-reference is this:
> 
>   The callee's parameters are merely /new names/ for the caller's
>   argument variables -- as far as that makes sense.
> 
> There's a caveat there for argument expressions which don't correspond
> directly to variables -- and I've glossed over the issue of lvalue
> expressions which designate locations and all of that. 

Greetings, Mark!

A little background on myself, hopefully making my soon-to-follow 
question less idiotic.

I've been in the PC world for 20+ years now, and dabbled with 
programming through much of that time.  I've written small utilities in 
Assembly (x86) and CL (AS/400), I just recently wrote a dbf module for 
python, and I've studied (in and out of the classroom) C, Fortran, 
Pascal, Java, Perl, Php, and Basic.

While I have had some formal training, my degree is in Business (long 
story -- I would rather have done CS), and much of your explanation in 
previous posts was waaaaay over my head.

I am in complete agreement with Steven's description of the behaviorist 
point of view for pass-by-value and pass-by-reference, and if asked I 
would say Python is pass-by-object.  I offer this so you know where I'm 
coming from, not from any hostile motive.

I was hoping you might be able to clarify those last two sound bites for 
me -- I think I understand what you are saying, but I'm confused about 
how they relate to Python...

Specifically, how is a new name (pbr) different, in Python, from a new 
name initialized as if by assignment (pbv)?  It seems to me than you end 
up with the same thing in either case (in Python, at least), making the 
distinction non-existent.

def func(bar):
     bar.pop()

Pass-by-reference:
   foo = ['Ethan','Furman']
   func(foo)			# bar = foo

Pass-by-value:
   foo = ['Python','Rocks!']
   func(foo)			# bar is new name for foo
				# is this any different from above?

If I have this right, in both cases foo will be reduced to a single-item 
list after func.  Any further explanation you care to provide will be 
greatly appreciated!

~Ethan~


From rhodri at wildebst.demon.co.uk  Fri Feb 27 19:08:30 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 28 Feb 2009 00:08:30 -0000
Subject: why cannot assign to function call
In-Reply-To: <49A87D7F.8090500@stoneleaf.us>
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<gjtj6a$8ud$1@ger.gmane.org>
	<mailman.6612.1231183278.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<49A87D7F.8090500@stoneleaf.us>
Message-ID: <op.up1b0gf8a8ncjz@gnudebst>

On Fri, 27 Feb 2009 23:55:43 -0000, Ethan Furman <ethan at stoneleaf.us>  
wrote:

I'm not Mark, but you did post to the whole group!

[snippety snip]

> Specifically, how is a new name (pbr) different, in Python, from a new  
> name initialized as if by assignment (pbv)?  It seems to me than you end  
> up with the same thing in either case (in Python, at least), making the  
> distinction non-existent.
>
> def func(bar):
>      bar.pop()
>
> Pass-by-reference:
>    foo = ['Ethan','Furman']
>    func(foo)			# bar = foo
>
> Pass-by-value:
>    foo = ['Python','Rocks!']
>    func(foo)			# bar is new name for foo

With true pass-by-value, this comment is not true.  Bar would be a copy
of foo, not a new name.  What happens to bar is then not reflected in
foo (depending on how deep the copy is), which is the objective of
pass-by-value.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From vinay_sajip at yahoo.co.uk  Fri Feb 27 19:29:05 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 27 Feb 2009 16:29:05 -0800 (PST)
Subject: logging.Handler not working with QThreads
References: <mailman.776.1235606253.11746.python-list@python.org>
Message-ID: <fa1962be-dcd3-42c0-b6ea-ab78bff4703f@j39g2000yqn.googlegroups.com>

On Feb 25, 11:57 pm, Lukas Hetzenecker <L... at gmx.at> wrote:
> Hello,
>
> I created a QTextEdit where I wanted to display log messages.
> A logging.Handler should do this job.
>
> It worked with one thread well, but when I start a QThread the text on all
> widgets is removed and I get many errors in my konsole:
>
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
>
> .. and so on
>
> I attatched a small example to this mail.
>
> Could anybody tell me what I'm doing wrong?
> Thanks for you help,
> Lukas
>
>  logging_error.py
> 3KViewDownload

Google seems to have swallowed my first attempt to reply, trying
again...

The following slightly modified script

http://dpaste.com/hold/2947/

seems to work as expected (see screenshot at
http://i722.photobucket.com/albums/ww224/vsajip/screenshot.png)

I just changed the script because my KDE doesn't have QPlainTextEdit,
so I used just plain QTextEdit instead. I also modified the thread run
method to loop over 10 seconds, so that I could show multiple threads
interleaving their output with messages from main window/log window.

Tested on Kubuntu (Hardy, KDE3) with SIP 4.7.9 and PyQt 4.4.4 running
on Qt 4.3.4.

Regards,

Vinay Sajip


From wuwei23 at gmail.com  Fri Feb 27 22:17:23 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 27 Feb 2009 19:17:23 -0800 (PST)
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <f3201f29-e7f3-4060-9eb6-04042e006b4f@z6g2000pre.googlegroups.com>

On Feb 28, 8:08?am, ntwrkd <ntw... at gmail.com> wrote:
> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.
>
> I'm not sure what I should take into account or how I might go about
> implementing this?
> Any suggestions are appreciated.

Urwid is a Python console UI lib and is definitely what I'd turn to
for something like this:

http://excess.org/urwid/


From sammo2828 at gmail.com  Fri Feb 27 22:21:53 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 27 Feb 2009 19:21:53 -0800 (PST)
Subject: What's so wrong about execfile?
Message-ID: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>

Given that execfile has been removed in py3k, I want to understand
exactly why.

Okay, I get that execfile is bad from the following thread:

On Jul 29 2007, 2:39 pm, Steven D'Aprano
<st... at REMOVE.THIS.cybersource.com.au> wrote:
> (1) Don't use eval, exec or execfile.
>
> (2) If you're an expert, don't use eval, exec or execfile.
>
> (3) If you're an expert, and are fully aware of the security risks, don't
> use eval, exec or execfile.
>
> (4) If you're an expert, and are fully aware of the security risks, and
> have a task that can only be solved by using eval, exec or execfile, find
> another solution.
>
> (5) If there really is no other solution, you haven't looked hard enough.
>
> (6) If you've looked REALLY hard, and can't find another solution, AND
> you're an expert and are fully aware of the security risks, THEN you can
> think about using eval, exec or execfile.

What are some of the reasons why execfile should not be used?

What are some examples of cases where execfile is the correct way of
doing something?


From steve at holdenweb.com  Fri Feb 27 23:09:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 23:09:36 -0500
Subject: Queries
In-Reply-To: <goacjs$8cd$1@ger.gmane.org>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>	<mailman.894.1235739864.11746.python-list@python.org>	<efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com>
	<goacjs$8cd$1@ger.gmane.org>
Message-ID: <goadfl$9i0$1@ger.gmane.org>

Dennis Lee Bieber wrote:
> On Fri, 27 Feb 2009 15:39:13 -0800 (PST), mmcclaf <mmcclaf at gmail.com>
> declaimed the following in gmane.comp.python.general:
> 
>> This came in the Python groups, and I put one up in the database
>> group, since I will later have to use Python to access the SQL file,
[...]
>> The relational algebra, I am able to translate it into SQL, or most of
> 
> ... and formal relational algebra is a notation many users of database
> engines like MySQL, SQLite, Access/JET, Visual FoxPro, Paradox, Sybase,
> etc. have never encountered -- heck, Access tries to hide SQL from the
> user via a form of QBE interface.
> 
> 	If I were to attempt a textual version of relational algebra, you'd
> be getting something on the order of:
> 
> t1 = Ships x Classes
> t2 = restrict t1(Ships.class = Classes.class)
> res = project t2(Ships.name, Classes.class, Classes.country)
> 
> instead of straight forward SQL
> 
> select Ships.name, Classes.class, Classes.country from Ships
> 	inner join Classes
> 		on Ships.class = Classes.class
> 
> 
I think the real problem is that the database design the OP is using os
far from normalized. This will tend to contort the logic, as well as
making the programming harder to understand.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From pavlovevidence at gmail.com  Sat Feb 28 00:15:15 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 27 Feb 2009 21:15:15 -0800 (PST)
Subject: What's so wrong about execfile?
References: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>
Message-ID: <c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>

On Feb 27, 7:21?pm, Sammo <sammo2... at gmail.com> wrote:
> Given that execfile has been removed in py3k, I want to understand
> exactly why.
>
> Okay, I get that execfile is bad from the following thread:
>
> On Jul 29 2007, 2:39 pm, Steven D'Aprano
>
>
>
> <st... at REMOVE.THIS.cybersource.com.au> wrote:
> > (1) Don't use eval, exec or execfile.
>
> > (2) If you're an expert, don't use eval, exec or execfile.
>
> > (3) If you're an expert, and are fully aware of the security risks, don't
> > use eval, exec or execfile.
>
> > (4) If you're an expert, and are fully aware of the security risks, and
> > have a task that can only be solved by using eval, exec or execfile, find
> > another solution.
>
> > (5) If there really is no other solution, you haven't looked hard enough.
>
> > (6) If you've looked REALLY hard, and can't find another solution, AND
> > you're an expert and are fully aware of the security risks, THEN you can
> > think about using eval, exec or execfile.
>
> What are some of the reasons why execfile should not be used?
>
> What are some examples of cases where execfile is the correct way of
> doing something?

You didn't quote the context of Steven's reply, so I don't know if he
was talking in general, or for a particular situation.  I suspect it
was the latter, though.

Anyway, there is one generally valid use case for these three: when
it's your deliberate intention to give the user the power to run
arbitrary Python code.  If you really want to give the user this
power, and the user is trusted on whatever machine they are running it
on, go ahead and use it.  No apology necessary.

[For instance, the package I use to generate my web site uses exec and
eval, because it processes templates with embedded Python code.  It's
all generated statically, on my own desktop, and I author all the
pages myself, so there is no security risk.  If I were to distribute
this package (and I do, though not many people use it, because
everyone just writes their own HTML templates), there would be no risk
because the user is expected to be able to run Python, and if they can
be trusted to run Python on their own system, they can be trusted to
run my program, which execs templates that they write themselves.]

I would suggest, however, that even if that is your intention that you
consider leveraging Python's built-in import infrastructure.  Instead
of execfile, you could have your program simply import a module the
user writes (after adding a user-specific directory to sys.path).


Now, here are a few situations where you should follow Steven's advice
above (i.e., don't, ever):

- Don't ever use exec or eval to construct a variable name
dynamically.  Don't ever do this, for instance:

x = eval("self","%s%d" % (name,index))

This is unforgiveable.  Python has better and safer ways to do this
(use getattr, setattr, globals, and locals built-ins).  And if you
find yourself using them a lot, it's a red flag that you should be
using dicts instead.

- Don't ever pass any data to exec or eval that you didn't either
write, or thoroughly inspect, yourself.  Especially don't pass it any
data you received over the network.  You have to be the super extreme
expert that Steven described, and own a lot of liability insurance,
befor you can do that.


Carl Banks


From zaheer.agadi at gmail.com  Sat Feb 28 00:17:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Fri, 27 Feb 2009 21:17:41 -0800 (PST)
Subject: what does this mean....?
Message-ID: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>

I am trying to download a file from the server, I am getting this
error,what does this mean

   localFile = open(localFileName, 'wb')
TypeError: coercing to Unicode: need string or buffer, type found



From python at rcn.com  Sat Feb 28 00:26:44 2009
From: python at rcn.com (Raymond Hettinger)
Date: Fri, 27 Feb 2009 21:26:44 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
Message-ID: <0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>

[Steve Holden]
> A sort of premature pessimization, then.

QOTW!

 _ ~
 @ @
 \_/


Raymond



From sjmachin at lexicon.net  Sat Feb 28 00:50:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 27 Feb 2009 21:50:27 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
Message-ID: <b81b2932-51a9-43e3-83df-2df2040aee18@v1g2000prd.googlegroups.com>

On Feb 28, 4:17?pm, zaheer.ag... at gmail.com wrote:
> I am trying to download a file from the server, I am getting this
> error,what does this mean
>
> ? ?localFile = open(localFileName, 'wb')
> TypeError: coercing to Unicode: need string or buffer, type found

the name localFileName is bound to a type ... and of course it's
expecting a string.

You must have done something weird with localFileName, like this:

| >>> fname = type(2)
| >>> fname
| <type 'int'>
| >>> f = open(fname)
| Traceback (most recent call last):
|   File "<stdin>", line 1, in <module>
| TypeError: coercing to Unicode: need string or buffer, type found
| >>>


From rhodri at wildebst.demon.co.uk  Sat Feb 28 00:50:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 28 Feb 2009 05:50:38 -0000
Subject: what does this mean....?
In-Reply-To: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
Message-ID: <op.up1ruodca8ncjz@gnudebst>

On Sat, 28 Feb 2009 05:17:41 -0000, <zaheer.agadi at gmail.com> wrote:

> I am trying to download a file from the server, I am getting this
> error,what does this mean
>
>    localFile = open(localFileName, 'wb')
> TypeError: coercing to Unicode: need string or buffer, type found

The rest of the traceback and enough of your code to make sense of
it would have helped.  Without context, my best guess is that
"localFileName" isn't actually a string.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From ken at seehart.com  Sat Feb 28 01:06:26 2009
From: ken at seehart.com (Ken Seehart)
Date: Fri, 27 Feb 2009 22:06:26 -0800
Subject: How do I count the distance between strings in a list?
In-Reply-To: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <49A8D462.1090108@seehart.com>

collin wrote:
> For example, if I were to have the code
>
> randomlist = ["1", "2", "3", "4"]
>
> And I want to count the distance between strings "1" and "4" which is
> 3, what command can I use to do this?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
randomlist.index("4") - randomlist.index("1")

Ken



From stefan_ml at behnel.de  Sat Feb 28 01:38:41 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 28 Feb 2009 07:38:41 +0100
Subject: Define a constant in Python C extension
In-Reply-To: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <49a8dbf1$0$32679$9b4e6d93@newsspool2.arcor-online.net>

fredbasset1000 at gmail.com wrote:
> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

Have you looked at Cython? It allows you to define e.g. enums as "public"
and will generate the rest for you.

http://cython.org

Stefan


From zaheer.agadi at gmail.com  Sat Feb 28 01:44:28 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Fri, 27 Feb 2009 22:44:28 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
Message-ID: <cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>

On Feb 28, 10:50 am, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Sat, 28 Feb 2009 05:17:41 -0000, <zaheer.ag... at gmail.com> wrote:
> > I am trying to download a file from the server, I am getting this
> > error,what does this mean
>
> >    localFile = open(localFileName, 'wb')
> > TypeError: coercing to Unicode: need string or buffer, type found
>
> The rest of the traceback and enough of your code to make sense of
> it would have helped.  Without context, my best guess is that
> "localFileName" isn't actually a string.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Ohh thats my bad, I was actually  passing  a file type instead of
string,thanks a lot .
One question off the topic.,
How to create a .pyz file. I have python project that has some modules
in it , I want to create a zip file so that I can use it as we use
java jar file
Like I want to do a
mypyFiles.pyz --sendFile C:\\testFile
I currently have a module that does this when run as single python
module, but I want to do same this using a zip file which will  have
some other modules within it.

Any help..?

Thanks



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 03:31:00 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 06:31:00 -0200
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
Message-ID: <op.up1y9yf7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.agadi at gmail.com> escribi?:

> One question off the topic.,

Usually it's better to post a separate message.

> How to create a .pyz file. I have python project that has some modules
> in it , I want to create a zip file so that I can use it as we use
> java jar file
> Like I want to do a
> mypyFiles.pyz --sendFile C:\\testFile
> I currently have a module that does this when run as single python
> module, but I want to do same this using a zip file which will  have
> some other modules within it.

Just put all your modules inside the zip, and create a __main__.py file.  
Execute it using:

	python foo.zip

See http://docs.python.org/using/cmdline.html#command-line

-- 
Gabriel Genellina



From goodz158 at yahoo.com  Sat Feb 28 03:41:41 2009
From: goodz158 at yahoo.com (Good Z)
Date: Sat, 28 Feb 2009 00:41:41 -0800 (PST)
Subject: Issues using SOAP/WSDL with HTTPS
References: <415de41f-418a-4f21-97b7-6037a095ccc1@k1g2000prb.googlegroups.com>
	<4960d898$0$30239$9b4e6d93@newsspool1.arcor-online.net>
	<4960e88d$0$28676$7a628cd7@news.club-internet.fr>
Message-ID: <331921.78646.qm@web35902.mail.mud.yahoo.com>

Hello all, 
I am new to SOAP/WebServices and getting error when using HTTPS with it. Any  help is appreciated. here is what i am doing:


import xml 
import fpconst 
import SOAPpy 
from SOAPpy import WSDL 
wsdlFile = 'https://xxxx..com/webService.wsdl' 
server = WSDL.Proxy(wsdlFile) 


It seems the WSDL file has been read but when it tried to GET the XSD file that is there in WSDL file, we get following error. 


  File "<stdin>", line 1, in <module>
  File "/var/lib/python-support/python2.5/SOAPpy/WSDL.py", line 62, in __init__
    self.wsdl = reader.loadFromStream(stream, wsdlsource)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/WSDLTools.py", line 34, in loadFromStream
    wsdl.load(document)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/WSDLTools.py", line 260, in load
    schema = reader.loadFromNode(WSDLToolsAdapter(self), item)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 80, in loadFromNode
    schema.load(reader)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 1088, in load
    self.addImportSchema(tp.getSchema())
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 1205, in getSchema
    self._schema = reader.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 111, in loadFromURL
    reader.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 266, in loadFromURL
    self.__node = DOM.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/Utility.py", line 614, in loadFromURL
    file = urlopen(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/Utility.py", line 155, in urlopen
    response = conn.getresponse()
  File "/usr/lib/python2.5/httplib.py", line 931, in getresponse
    response.begin()
  File "/usr/lib/python2.5/httplib.py", line 388, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.5/httplib.py", line 352, in _read_status
    raise BadStatusLine(line)


Regards,
Mike



      
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From bignose+hates-spam at benfinney.id.au  Sat Feb 28 03:50:59 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 28 Feb 2009 19:50:59 +1100
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
	<mailman.931.1235809891.11746.python-list@python.org>
Message-ID: <87wsbbaqrw.fsf@benfinney.id.au>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.agadi at gmail.com> escribi?:
> 
> > One question off the topic.,
> 
> Usually it's better to post a separate message.

More specifically (and I only say this because many people seem not to
observe the distinction), when starting an entirely new topic of
discussion, you should not reply to an existing message since it's
then confusingly related with the same thread; instead, compose a
*new* message with the appropriate subject.

-- 
 \           ?Either he's dead or my watch has stopped.? ?Groucho Marx |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From zaheer.agadi at gmail.com  Sat Feb 28 04:13:52 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 01:13:52 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
	<mailman.931.1235809891.11746.python-list@python.org>
	<87wsbbaqrw.fsf@benfinney.id.au>
Message-ID: <3826c1e5-6e6c-4c77-bf6f-381739654dd7@33g2000yqm.googlegroups.com>

On Feb 28, 1:50 pm, Ben Finney <bignose+hates-s... at benfinney.id.au>
wrote:
> "Gabriel Genellina" <gagsl-... at yahoo.com.ar> writes:
> > En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> > > One question off the topic.,
>
> > Usually it's better to post a separate message.
>
> More specifically (and I only say this because many people seem not to
> observe the distinction), when starting an entirely new topic of
> discussion, you should not reply to an existing message since it's
> then confusingly related with the same thread; instead, compose a
> *new* message with the appropriate subject.
>
> --
>  \           ?Either he's dead or my watch has stopped.? ?Groucho Marx |
>   `\                                                                   |
> _o__)                                                                  |
> Ben Finney

I agree I should have posted a new topic, Point taken..
Thanks Gabriel ,I will try this if  could not get this to work will
post a new thread.


From jineu21 at hotmail.com  Sat Feb 28 05:15:37 2009
From: jineu21 at hotmail.com (Clarendon)
Date: Sat, 28 Feb 2009 02:15:37 -0800 (PST)
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com> 
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com> 
	<go8opf$pd$4@ger.gmane.org>
	<mailman.900.1235742411.11746.python-list@python.org>
Message-ID: <9d9282b1-4d5f-48bd-99d4-3bd5c23b52e1@o36g2000yqh.googlegroups.com>

Thank you very much for all your replies. I actually used the while
loop as the data is not large. But I was looking for a simpler, built
in command, something like L.remove('a', all) or L.removeall('a').
Python has re.findall function, but why not removeall, so users have
to make up long lines of expression?


From nick at craig-wood.com  Sat Feb 28 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 28 Feb 2009 04:30:04 -0600
Subject: Using xreadlines
References: <mailman.865.1235695165.11746.python-list@python.org>
	<82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>
Message-ID: <slrngqi1o4.2ms.nick@irishsea.home.craig-wood.com>

bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
>  Brett Hedges:
> > My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.<
> 
>  In modern versions of Python you usually don't need xreadlines,
>  because files are iterable.
> 
>  If your files are small, you can just read all the lines in a list
>  with open(...).readlines(), and then just use the item of the list
>  with the n-1 index.

There is also the linecache module

  http://docs.python.org/library/linecache.html

Which may be useful...

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From python at bdurham.com  Sat Feb 28 08:12:39 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 28 Feb 2009 08:12:39 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
	<0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>
Message-ID: <1235826759.2954.1302874671@webmail.messagingengine.com>


>> A sort of premature pessimization, then.

QOTW!

+1

Malcolm


From mdw at distorted.org.uk  Sat Feb 28 08:54:40 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Sat, 28 Feb 2009 13:54:40 +0000
Subject: why cannot assign to function call
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
Message-ID: <87myc6oee7.fsf.mdw@metalzone.distorted.org.uk>

Ethan Furman <ethan at stoneleaf.us> writes:

> Mark Wooding wrote:
>> Here's what I think is the defining property of pass-by-value [...]:
>>
>>   The callee's parameters are /new variables/, initialized /as if by
>>   assignment/ from the values of caller's argument expressions.
>>
>> My soundbite definition for pass-by-reference is this:
>>
>>   The callee's parameters are merely /new names/ for the caller's
>>   argument variables -- as far as that makes sense.
>
> Greetings, Mark!

You posted to the whole group -- probably using a wide-reply option
while reading the mailing list.  Still, I'll give an answer here in
order to help any other readers of the list or newsgroup.  However, as
far as I'm concerned, this discussion is basically at an end and I'm not
really interested in starting it up all over again.  To that end, I've
set followups to `poster'.  I shall continue reply to private email
which seems interested in a sensible discussion.

> I was hoping you might be able to clarify those last two sound bites
> for me -- I think I understand what you are saying, but I'm confused
> about how they relate to Python...
>
> Specifically, how is a new name (pbr) different, in Python, from a new
> name initialized as if by assignment (pbv)?  It seems to me than you
> end up with the same thing in either case (in Python, at least),
> making the distinction non-existent.

You've missed a level of indirection.  In particular, `names' aren't
things that you initialize.  They're things that you /bind/ to
variables.  The crucial difference is that, in pass-by-value, new
variables are created as an intrinsic part of the process, whereas in
pass-by-reference, new variables are not (usually) created, and instead
the formal parameter names are bound to the caller's pre-existing
argument variables.

It's worth noting that I use the terms `name' and `binding' in different
ways from most of the Python community.  This is unfortunate.  The
discrepancy is actually because the Python meanings of these words are
not the same as the meanings in the wider computer science and
mathematical communities.  For example, many Python users seem to use
`binding' to mean `assignment', which is a shame because it leaves the
concept that is usually called `binding' without a name.  So I'll stick
with the wider meanings.

A while ago, I posted an essay -- to this group -- which may help
explain the concepts:

        Message-ID: <8763k14nc6.fsf.mdw at metalzone.distorted.org.uk>
        http://groups.google.com/group/comp.lang.python/msg/f6f1a321f819d02b

On with the question.

> def func(bar):
>     bar.pop()
>
> Pass-by-reference:
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo
>
> Pass-by-value:
>   foo = ['Python','Rocks!']
>   func(foo)			# bar is new name for foo
> 				# is this any different from above?
>
> If I have this right, in both cases foo will be reduced to a
> single-item list after func.  

You're correct.  So: we can conclude that the above test is not
sufficient to distinguish the two cases.

> Any further explanation you care to provide will be greatly
> appreciated!

This test is sufficient to distinguish:

        def test(x):
          x = 'clobbered'

        y = 'virgin'
        test(y)
        print y

If it prints `virgin' then you have call-by-value.  If it prints
`clobbered' then you have call-by-reference.

Let's examine the two cases, as I did in the essay I cited above.  I'll
do call-by-value first.  First, we define a function `test'.  Then, we
initialize `y'.  It's worth examining this process in detail.  The name
`y' is initially unbound. so it is implicitly bound to a fresh
variable.  Then, (a reference to) the string object 'virgin' is stored
in this variable.  We can show this diagrammatically as follows.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

(In the diagrams, ===> denotes a binding relationship, between names and
variables; and ---> denotes a reference relationship, between variables
and values.)

Next, we call the `test' function.  Call-by-value says that we must
evaluate the argument expressions.  There's only one: `x'.  The value of
a name is obtained by (a) finding which variable is bound to the name,
and (b) extracting the value from this variable.  Well, the variable is
the one we just bound, and the value stored is (the reference to) the
string 'virgin'.  So the result of evaluating the argument expressions
is simply (the reference to) that string.

The function has one parameter, `y'.  A new environment is constructed
by extending the global environment.  In this new environment, the name
`y' is bound to a fresh variable -- distinct from all others, and
especially from the variable bound to `x' -- and in that variable we
store the value of the corresponding argument expression.  Result: the
function body is executed in an environment which is like the global
environment except that `y' is bound to a fresh variable containing
'virgin'.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'
                                                  ^
                                                  |
        x (in function `test') ====> [VAR] -------'

Now there's an assignment

          x = 'clobbered'

The name `x' is already bound to a variable.  So we modify that variable
so that it stores (a reference to) the string 'clobbered'.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

        x (in function `test') ====> [VAR] ---> 'clobbered'

And then the function ends.  The environment we constructed is
forgotten.  The variable bound to `x' is lost forever, since it wasn't
bound to any other name.  Since modifying that variable was the only
action carried out in the function, and the variable is now lost, there
is no externally observable effect.  When we finally print `y', we see
`virgin', because the variable bound to `y' was unchanged.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

So much for call-by-value.  How about call-by-reference?  Well,
everything is the same until the actual call.  But then everything
changes.

Firstly, call-by-reference /doesn't/ evaluate the argument expressions.
Instead, we just note that `y' is bound to a particular variable in the
global environment.  The function has a single parameter `x'.  A new
environment is constructed by extending the global environment (again):
in this new environment, the name `x' is bound to /the same variable/
that `y' is bound to in the global environment.

        y (in global env.)  ====>  [VAR]  <===== x (in function `test')
                                     |
                                     |
                                     v
                                 'virgin'

Now we assign to `x'.  The detailed rules are the same: `x' is bound, so
we modify the variable it's bound to, so that it stores 'clobbered'.
But this time, the variable being clobbered is the /same/ variable that
`y' is bound to.  So finally, when we print `y', we see the string
'clobbered.


        y (in global env.)  ====>  [VAR]  <===== x (in function `test')
                                     |
                                     |
                                     v
                                'clobbered'

Now, let's look at your example.

> def func(bar):
>     bar.pop()
>
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo

I won't describe this in the same excruciating detail as I did for the
one above; but I will make some observations.

In call-by-reference, the environment in which the body of `func' is
executed is constructed by extending the global environment with a
binding of the name `bar' to the same variable as is bound to `foo' in
the global environment.  There is only the one variable, so obviously
both names (considered as expressions) must evaluate to the same value.
I won't go into the details of method invocation, which in Python is
quite complicated; but `bar.pop()' mutates this value: it modifies it in
place.  So, when the function returns, `foo' can be seen to print
differently.  The value is, in some sense, the /same/ value as it was
before, in that it occupies the same storage locations, but the contents
of those storage locations has been altered.

              foo =====> [VAR] <===== bar
        (in global env)    |    (in function `func')   
                           |
                           v
                   ['Ethan', 'Furman']

In call-by-value, `func' executes in an environment constructed by
extending the global environment with a binding of `bar' to a /fresh/
variable.  This fresh variable is then initialized: we store the value
of the argument expression `foo' into it.  This value is a reference to
the list ['Ethan', 'Furman'].  (See, I've stopped parenthesizing the
reference stuff, because here it really matters.)  So, we have two
variables, bound to `foo' and `bar', but both variables refer to the
same list object.  The body of `func' doesn't modify any variables;
rather, it mutates the list object in place (as above).  Since both
variables refer to the /same/ list object, this mutation is still
observable outside of the function.

              foo =====> [VAR] ---> ['Ethan', 'Furman']
        (in global env)                     ^
                                            |
              bar =====> [VAR'] ------------'
        (in function `func')

So the reason that your example doesn't distinguish the two cases is
because, in both cases, there's still only one value, which is mutated.
But there is a conceptual difference, unobservable in this instance,
because call-by-reference has two names bound to the same variable,
while call-by-value has two names, bound to /distinct/ variables but
which both refer to the same value.

Finally, it may be instructive to remove the issue of function calling
altogether.  Consider:

        foo = ['Ethan', 'Furman']
        bar = foo
        bar.pop()

What is the final value of `foo'?

Now:

        x = 'virgin'
        y = x
        y = 'clobbered'

What is the final value of `x'?

Are you enlightened?

-- [mdw]


From mmcclaf at gmail.com  Sat Feb 28 10:00:22 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Sat, 28 Feb 2009 07:00:22 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
	<mailman.894.1235739864.11746.python-list@python.org> 
	<efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com> 
	<goacjs$8cd$1@ger.gmane.org>
	<mailman.928.1235794240.11746.python-list@python.org>
Message-ID: <8289ef1a-d128-4eef-95db-dd515c8fff92@n20g2000vba.googlegroups.com>

So basically you are complaining that groups don't pick up post by
GMail users?

As for the SQL thing, you still don't see how I am linking this to
SQL? I have to make in your terms: a textual representation of the
statements I'd make in SQL. The statement I made with the bold SELECT,
etc, replace those with the relational algebra symbols, hence needing
to make a relational algebra expression.

>> So in short of the responses given, I need to study further: GROUP BY,
>> HAVING, AS, COUNT, and subselect queries, right?

>        Since it's homework, we (this group) won't be giving direct SQL statements...

I never said I wanted direct SQL statements, moreso guidance as to
what direction I should be heading for each of the queries. I just
wanted to make sure that there might not be other things I might want
to study as  well that might be required for the queries. Try not to
interpret what isn't there... I'm looking for help, not direct answers.


From cjw at ncf.ca  Sat Feb 28 10:58:10 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sat, 28 Feb 2009 10:58:10 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
Message-ID: <49A95F12.3010906@ncf.ca>

Raymond Hettinger wrote:
> [Paul Rubin]
>> Ehh, I guess I'm not surprised at the slowdown and extra complexity
>> from the second dict.  Oh well.  If the module really turns out to be
>> really used a lot, another (messy) approach would be to write a C
>> extension that uses a doubly linked list some day.
> 
> That seems like an ideal implementation to me.
> 
>   O(1): appending, popping, searching, and deletion
>   O(n): traversal
> 
> Raymond

Sometimes, it's useful to be able to 
obtain the data in the sorted sequence.

You might consider adding functionality 
like:

     def seqItems(self):
         '''To return the items, sorted 
by key. '''
         return [self[k] for k in 
self.seqKeys()]

     def seqKeys(self):
         ''' To return the keys sorted.  '''
         k= self.keys()
         k.sort()
         return k

     def seqValues(self):
         ''' To return the values, with 
their keys, sorted by value. '''
         v= [(it[1], it[0]) for it in 
self.items()]
         v.sort()
         return v

Colin W.


From steve at pearwood.info  Sat Feb 28 10:59:18 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Mar 2009 02:59:18 +1100
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
	<go8opf$pd$4@ger.gmane.org>
	<mailman.900.1235742411.11746.python-list@python.org>
Message-ID: <01b9549a$0$20612$c3e8da3@news.astraweb.com>

Chris Rebert wrote:

> Obviously that equivalence is true, but in this case I'm emphasizing
> that it's even worse than that when constant factors are taken into
> account. Big-O is nice in the abstract, but in the real-world those
> constant factors can matter.
> 
> In pure big-O, it is indeed O(M*N) vs. O(N)
> Including constant factors, the performance is roughly 2*M*N*X [X =
> overhead of remove()] vs. N, which makes the badness of the algorithm
> all the more apparent.


So, what you're saying is that if you include a constant factor on one side
of the comparison, and neglect the constant factors on the other, the side
with the constant factor is worse. Well, duh :)

I forget which specific O(N) algorithm you're referring to, but I think it
was probably a list comp:

L[:] = [x for x in L if x != 'a']

As a wise man once said *wink*, "Big-O is nice in the abstract, but in the
real-world those constant factors can matter". This is very true... in this
case, the list comp requires creating a new list, potentially resizing it
an arbitrary number of times, then possibly garbage collecting the previous
contents of L. These operations are not free, and for truly huge lists
requiring paging, it could get very expensive.

Big Oh notation is good for estimating asymptotic behaviour, which means it
is good for predicting how an algorithm will scale as the size of the input
increases. It is useless for predicting how fast that algorithm will run,
since the actual speed depends on those constant factors that Big Oh
neglects. That's not a criticism of Big Oh -- predicting execution speed is
not what it is for.

For what it's worth, for very small lists, the while...remove algorithm is
actually faster that using a list comprehension, despite being O(M*N)
versus O(N), at least according to my tests. It's *trivially* faster, but
if you're interested in (premature) micro-optimisation, you might save one
or two microseconds by using a while loop for short lists (say, around
N<=12 or so according to my tests), and swapping to a list comp only for
larger input.

Now, this sounds silly, and in fact it is silly for the specific problem
we're discussing, but as a general technique it is very powerful. For
instance, until Python 2.3, list.sort() used a low-overhead but O(N**2)
insertion sort for small lists, only kicking off a high-overhead but O(N)
sample sort above a certain size. The current timsort does something
similar, only faster and more complicated. If I understand correctly, it
uses insertion sort to make up short runs of increasing or decreasing
values, and then efficiently merges them.


-- 
Steven



From steven.oldner at gmail.com  Sat Feb 28 11:08:17 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Sat, 28 Feb 2009 08:08:17 -0800 (PST)
Subject: Data Coding suggestions
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
	<477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>
Message-ID: <74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>

On Feb 27, 2:04?pm, Rick Dooling <rpdool... at gmail.com> wrote:
> On Feb 27, 6:42?am, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > Just learning Python and have a project to create a weekly menu and a
> > shopping list from the menu. ?
> > Question: ?How should I set up the data? ?I'm looking at maybe 70 menu
> > items and maybe 1000 items for the shopping list. ?I need to be able
> > to maintain each item also.
>
> I agree with Mr. Holden. It's a perfect exercise for using Python with
> sqlite3.
>
> And the nice thing about this documentation is it has plenty of good
> examples:
>
> http://docs.python.org/library/sqlite3.html
>
> Good luck,
>
> RD

Thanks guys.  While shopping today I've thought of a few more columns
for my data so my first item will be building the 3 DB tables and a
way to populate them.  Since this was intended to automate what I do
on a weekly basis, I didn't think about adding recipes since I know
what I need for the family, but that's a good touch.

Item 1. Build 3 db tables
Item 2. Build app to populate tables.
Item 3. Build app to read tables and print lists.

Anything else?



From steve at pearwood.info  Sat Feb 28 11:27:53 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Mar 2009 03:27:53 +1100
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
Message-ID: <01b95b4d$0$20667$c3e8da3@news.astraweb.com>

Colin J. Williams wrote:

> Sometimes, it's useful to be able to
> obtain the data in the sorted sequence.
> 
> You might consider adding functionality
> like:
> 
> def seqItems(self):
> '''To return the items, sorted
> by key. '''
> return [self[k] for k in
> self.seqKeys()]

Amazingly, the Python time-machine provides such functionality! Using just a
handful of pre-existing pieces, you can do this:

sorted(mydict.items())
sorted(mydict.keys())
[mydict[x] for x in sorted(mydict.keys)]

and any other sequence you might need. That's the beauty of a general
purpose programming language. You don't need everything to be a built-in
*wink*



-- 
Steven



From zaheer.agadi at gmail.com  Sat Feb 28 11:34:15 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 08:34:15 -0800 (PST)
Subject: Creating Zip file like java jar file
Message-ID: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>

Hi,
I want to create zip file equivalent to java jar file,I created a zip
file of my sources and added some __main__.py
some how I am getting an error saying __main.py does not exist in the
zip file

  Copyproject(main folder)
      |
      |_____src(folder)
      |          |
      |          |__Nertworkpackage
      |           |            |
      |           |            |__Storepackage
      |           |                               |
      |           |__FtpPackage         |__module1.py
      |                                           |__module2.py
      |____ tests                          |__ module3.py

Copyproject(main folder) | |_____src(folder) | | | |__Nertworkpackage
| | | | | |__Storepackage | | | | |__FtpPackage |__module1.py | |
__module2.py |____ tests |__ module3.py

Module1 takes some commandline parameters that will do some operation
Like If I say
" module1.py --uploadFile <file name> " A file should get uploaded
(this works)
Now I want to do
Copyproject.zip --uploadFile <filename> to upload the file

How should I do this, I tried to put __main__ parallel to src folder
it says __Main__.py not found in Copyproject.zip..?



From daddysean23 at yahoo.com  Sat Feb 28 12:24:00 2009
From: daddysean23 at yahoo.com (Sean Novick)
Date: Sat, 28 Feb 2009 09:24:00 -0800 (PST)
Subject: TypeErrors
Message-ID: <260144.62922.qm@web33003.mail.mud.yahoo.com>

I'm having issues with?a phone-number database. 
Here is a code snippet:
?def menu():
??????? 
??????? print '''Please make a selection from the following options:
??????? To add an Employee - enter: 1
??????? 
??????? For a complete listing of Employees - enter: 2
??????? To see the 'test page' and exit the database - enter: 3'''
??????? print
??????? return input(":")
#Start of Program
??? foo = phonedb()
??? loop = 1
??? choice = 0
??? while loop == 1:
??????? choice = menu()
??????? if choice == 1:
??????????? print "Enter the Employee's full name: "
??????????? n = raw_input(':')
??????????? print "Enter the Employee's full telephone number: "
??????????? p = raw_input(':')
??????????? print "Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX, 4 = CELL)"
??????????? t = raw_input(':')
??????????? if t == '0':
??????????????? foo.add(n, p, UNKNOWN)
??????????? if t == '1':
??????????????? foo.add(n, p, HOME)
??????????? if t == '2':
??????????????? foo.add(n, p, WORK)
??????????? if t == '3':
??????????????? foo.add(n, p, FAX)
??????????? if t == '4':
??????????????? foo.add(n, p, CELL)
??????????????? print t
??? 
??????? elif choice == 2:
??????????? print(list)
??????????? 
??????? loop = 0
It works until I enter "t", then this is what I get:
"Please make a selection from the following options:
??????? To add an Employee - enter: 1
??????? 
??????? For a complete listing of Employees - enter: 2
??????? To see the 'test page' and exit the database - enter: 3"
:1
Enter the Employee's full name: 
:john
Enter the Employee's full telephone number: 
:123-456-7890
Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX, 4 = CELL)
:1
First lookup:
Traceback (most recent call last):
? File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
??? class phonedb:
? File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
??? for entry in foo.lookup('reifsch'):
? File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
??? if cmp(e, string) == 0:
TypeError: comparison did not return an int
>>> 
I do not know what this error means. I tried to look it up in help, but to no avail. If someone could please help or tell me where I could find an answer. Thanks.


      
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From hongyuan1306 at gmail.com  Sat Feb 28 12:35:47 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Sun, 1 Mar 2009 01:35:47 +0800
Subject: How best to test functions which use date.today
Message-ID: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>

HI,

In my project I have several date related methods which I want tested for
correctness. The functions use date.today() in several places. Since this
could change every time I run the test, I hope to find someway to fake a
date.today.

For illustration lets say I have a function:


from datetime import date
def today_is_2009():
    return date.today().year == 2009

To test this I would like to write test function like:

def test_today_is_2009():
    set_today(date(2008, 12, 31))
    assert today_is_2009() == False
    set_today(date(2009,1,1))
    assert today_is_2009() == True

The first approach of achieving this purpose is to monkey patch the
date.today like:

date.today = mytoday

But this fails with:

TypeError: can't set attributes of built-in/extension type 'datetime.date'

A second possibility would be to change the system date (I am running
Linux). However the standard Python module doesn't provide a method for this
purpose. I could use os.system to issue a date command. But I am not very
comfortable with this since changing the system time could break something
undesirably. Also I will then have to have root privilege to run my test.
Besides, I will have to stop the ntp daemon so it will not inadvertently
correct the system clock during the test period.

Is there any suggestion from the community on how best to test such
functions?

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From rasmussen.bryan at gmail.com  Sat Feb 28 12:38:45 2009
From: rasmussen.bryan at gmail.com (bryan rasmussen)
Date: Sat, 28 Feb 2009 18:38:45 +0100
Subject: c.Win32_OperatingSystem question.
Message-ID: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>

Maybe there's a more specific list I should ask this question on but I
don't know what it is. I'm using Tim Golden's wmi stuff, and putting
my output into an XML document.

I have the following bit of code


  root = et.Element("locations")
        ComputerInfo = et.SubElement(root, "ComputerInfo")
        ComputerName = et.SubElement(ComputerInfo,"ComputerName")
        ComputerDomain = et.SubElement(ComputerInfo,"Domain")

        location = et.SubElement(root, "location")
        locationpath = et.SubElement(location, "locationpath")
        locationtype = et.SubElement(location, "locationtype")
        currenttime = et.SubElement(location,"time")

        currenttimeZone = et.SubElement(ComputerInfo,"timeZone")
        BootDevice = et.SubElement(ComputerInfo,"BootDevice")
        BuildNumber = et.SubElement(ComputerInfo,"BuildNumber")
        BuildType = et.SubElement(ComputerInfo,"BuildType")
        Caption = et.SubElement(ComputerInfo,"Caption")
        CodeSet = et.SubElement(ComputerInfo,"CodeSet")
        CountryCode = et.SubElement(ComputerInfo,"CountryCode")
        Description = et.SubElement(ComputerInfo,"ComputerDescription")
        FreePhysicalMemory = et.SubElement(ComputerInfo,"FreeMemory")
        LocalDateTime = et.SubElement(ComputerInfo,"LocalDateTime")
        Locale = et.SubElement(ComputerInfo,"Locale")
        Manufacturer = et.SubElement(ComputerInfo,"Manufacturer")
        Organization = et.SubElement(ComputerInfo,"ComputerOrganization")


        OSType = et.SubElement(ComputerInfo,"OperatingSystem")
        WindowsDirectory = et.SubElement(ComputerInfo,"WindowsDirectory")

        # print  "ok"
        # time.sleep(3)


        for oper in c.Win32_OperatingSystem():
          # print "here"
          # time.sleep(3)
          ComputerName.text = str(oper.Name)
          ComputerDomain.text = str(oper.Domain)
          currenttimeZone.text = str(oper.CurrentTimeZone)
          try:
            currenttime.text = str(datetime.datetime.utcnow())
            BootDevice.text = str(oper.BootDevice)
            BuildNumber = et.SubElement(oper.BuildNumber)
            BuildType.text = str(oper.BuildType)
            Caption.text = str(oper.Caption)
            CodeSet.text = str(oper.CodeSet)
            CountryCode.text = str(oper.CountryCode)
            Description.text = str(oper.ComputerDescription)
            FreePhysicalMemory.text = str(oper.FreeMemory)
            LocalDateTime.text = str(oper.LocalDateTime)
            Locale.text = str(oper.Locale)
            Manufacturer.text = str(oper.Manufacturer)
            Organization.text = str(oper.ComputerOrganization)


            OSType.text = str(oper.OperatingSystem)
            WindowsDirectory.text = str(oper.WindowsDirectory)


At the end of that thhe only text node thaht comes out is
ComputerName, WMI is running - Am I using the wrong names for things
here? When I try to get the same values using WScript and WQL to
extract from Win32_OperatingSystem I get all the values.

Best Regards,
Bryan Rasmussen


From tjreedy at udel.edu  Sat Feb 28 12:46:13 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 28 Feb 2009 12:46:13 -0500
Subject: Delete all items in the list
In-Reply-To: <01b9549a$0$20612$c3e8da3@news.astraweb.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>	<go8opf$pd$4@ger.gmane.org>	<mailman.900.1235742411.11746.python-list@python.org>
	<01b9549a$0$20612$c3e8da3@news.astraweb.com>
Message-ID: <gobt95$nk8$1@ger.gmane.org>

Steven D'Aprano wrote:

> Big Oh notation is good for estimating asymptotic behaviour, which means it
> is good for predicting how an algorithm will scale as the size of the input
> increases. It is useless for predicting how fast that algorithm will run,
> since the actual speed depends on those constant factors that Big Oh
> neglects. That's not a criticism of Big Oh -- predicting execution speed is
> not what it is for.
> 
> For what it's worth, for very small lists, the while...remove algorithm is
> actually faster that using a list comprehension, despite being O(M*N)
> versus O(N), at least according to my tests. It's *trivially* faster, but
> if you're interested in (premature) micro-optimisation, you might save one
> or two microseconds by using a while loop for short lists (say, around
> N<=12 or so according to my tests), and swapping to a list comp only for
> larger input.
> 
> Now, this sounds silly, and in fact it is silly for the specific problem
> we're discussing, but as a general technique it is very powerful. For
> instance, until Python 2.3, list.sort() used a low-overhead but O(N**2)
> insertion sort for small lists, only kicking off a high-overhead but O(N)

O(NlogN)

> sample sort above a certain size. The current timsort does something
> similar, only faster and more complicated. If I understand correctly, it
> uses insertion sort to make up short runs of increasing or decreasing
> values, and then efficiently merges them.

It uses binary insertion sort to make runs of 64 (determined by 
empirical testing).  The 'binary' part means that it uses O(logN) binary 
search rather than O(n) linear search to find the insertion point for 
each of N items, so that finding insertion points uses only O(NlogN) 
comparisions (which are relatively expensive).  Each of the N insertions 
is done with a single memmove() call, which typically is relatively 
fast.  So although binary insertion sort is still O(N*N), the 
coefficient of the N*N term in the time formula is relatively small.

The other advantages of timsort are that it exploits existing order in a 
list while preserving the order of items that compare equal.

Terry Jan Reedy




From rasmussen.bryan at gmail.com  Sat Feb 28 12:47:33 2009
From: rasmussen.bryan at gmail.com (bryan rasmussen)
Date: Sat, 28 Feb 2009 18:47:33 +0100
Subject: c.Win32_OperatingSystem question.
In-Reply-To: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
References: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
Message-ID: <3bb44c6e0902280947q2446c572u873dc906b5ffb7bd@mail.gmail.com>

oh I noticed the problem with the
BuildNumber = et.SubElement(oper.BuildNumber)
instead of
BuildNumber = str(oper.BuildNumber)

and fixed it. No improvement in results however.

Best Regards,
Bryan Rasmussen

On Sat, Feb 28, 2009 at 6:38 PM, bryan rasmussen
<rasmussen.bryan at gmail.com> wrote:
> Maybe there's a more specific list I should ask this question on but I
> don't know what it is. I'm using Tim Golden's wmi stuff, and putting
> my output into an XML document.
>
> I have the following bit of code
>
>
> ?root = et.Element("locations")
> ? ? ? ?ComputerInfo = et.SubElement(root, "ComputerInfo")
> ? ? ? ?ComputerName = et.SubElement(ComputerInfo,"ComputerName")
> ? ? ? ?ComputerDomain = et.SubElement(ComputerInfo,"Domain")
>
> ? ? ? ?location = et.SubElement(root, "location")
> ? ? ? ?locationpath = et.SubElement(location, "locationpath")
> ? ? ? ?locationtype = et.SubElement(location, "locationtype")
> ? ? ? ?currenttime = et.SubElement(location,"time")
>
> ? ? ? ?currenttimeZone = et.SubElement(ComputerInfo,"timeZone")
> ? ? ? ?BootDevice = et.SubElement(ComputerInfo,"BootDevice")
> ? ? ? ?BuildNumber = et.SubElement(ComputerInfo,"BuildNumber")
> ? ? ? ?BuildType = et.SubElement(ComputerInfo,"BuildType")
> ? ? ? ?Caption = et.SubElement(ComputerInfo,"Caption")
> ? ? ? ?CodeSet = et.SubElement(ComputerInfo,"CodeSet")
> ? ? ? ?CountryCode = et.SubElement(ComputerInfo,"CountryCode")
> ? ? ? ?Description = et.SubElement(ComputerInfo,"ComputerDescription")
> ? ? ? ?FreePhysicalMemory = et.SubElement(ComputerInfo,"FreeMemory")
> ? ? ? ?LocalDateTime = et.SubElement(ComputerInfo,"LocalDateTime")
> ? ? ? ?Locale = et.SubElement(ComputerInfo,"Locale")
> ? ? ? ?Manufacturer = et.SubElement(ComputerInfo,"Manufacturer")
> ? ? ? ?Organization = et.SubElement(ComputerInfo,"ComputerOrganization")
>
>
> ? ? ? ?OSType = et.SubElement(ComputerInfo,"OperatingSystem")
> ? ? ? ?WindowsDirectory = et.SubElement(ComputerInfo,"WindowsDirectory")
>
> ? ? ? ?# print ?"ok"
> ? ? ? ?# time.sleep(3)
>
>
> ? ? ? ?for oper in c.Win32_OperatingSystem():
> ? ? ? ? ?# print "here"
> ? ? ? ? ?# time.sleep(3)
> ? ? ? ? ?ComputerName.text = str(oper.Name)
> ? ? ? ? ?ComputerDomain.text = str(oper.Domain)
> ? ? ? ? ?currenttimeZone.text = str(oper.CurrentTimeZone)
> ? ? ? ? ?try:
> ? ? ? ? ? ?currenttime.text = str(datetime.datetime.utcnow())
> ? ? ? ? ? ?BootDevice.text = str(oper.BootDevice)
> ? ? ? ? ? ?BuildNumber = et.SubElement(oper.BuildNumber)
> ? ? ? ? ? ?BuildType.text = str(oper.BuildType)
> ? ? ? ? ? ?Caption.text = str(oper.Caption)
> ? ? ? ? ? ?CodeSet.text = str(oper.CodeSet)
> ? ? ? ? ? ?CountryCode.text = str(oper.CountryCode)
> ? ? ? ? ? ?Description.text = str(oper.ComputerDescription)
> ? ? ? ? ? ?FreePhysicalMemory.text = str(oper.FreeMemory)
> ? ? ? ? ? ?LocalDateTime.text = str(oper.LocalDateTime)
> ? ? ? ? ? ?Locale.text = str(oper.Locale)
> ? ? ? ? ? ?Manufacturer.text = str(oper.Manufacturer)
> ? ? ? ? ? ?Organization.text = str(oper.ComputerOrganization)
>
>
> ? ? ? ? ? ?OSType.text = str(oper.OperatingSystem)
> ? ? ? ? ? ?WindowsDirectory.text = str(oper.WindowsDirectory)
>
>
> At the end of that thhe only text node thaht comes out is
> ComputerName, WMI is running - Am I using the wrong names for things
> here? When I try to get the same values using WScript and WQL to
> extract from Win32_OperatingSystem I get all the values.
>
> Best Regards,
> Bryan Rasmussen
>


From lie.1296 at gmail.com  Sat Feb 28 12:54:05 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 04:54:05 +1100
Subject: How best to test functions which use date.today
In-Reply-To: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
Message-ID: <49A97A3D.6@gmail.com>

Yuan HOng wrote:
> HI,
> 
> In my project I have several date related methods which I want tested for
> correctness. The functions use date.today() in several places. Since this
> could change every time I run the test, I hope to find someway to fake a
> date.today.
> 
> For illustration lets say I have a function:
> 
> 
> from datetime import date
> def today_is_2009():
>     return date.today().year == 2009
> 
> To test this I would like to write test function like:
> 
> def test_today_is_2009():
>     set_today(date(2008, 12, 31))
>     assert today_is_2009() == False
>     set_today(date(2009,1,1))
>     assert today_is_2009() == True
> 
> The first approach of achieving this purpose is to monkey patch the
> date.today like:
> 
> date.today = mytoday
> 
> But this fails with:
> 
> TypeError: can't set attributes of built-in/extension type 'datetime.date'

This is because today is an attribute. In python, we can override 
attribute access to become a function call. I don't have python right 
now, but try this:

del date.today
date.today = mytoday

> A second possibility would be to change the system date (I am running
> Linux). However the standard Python module doesn't provide a method for this
> purpose. I could use os.system to issue a date command. But I am not very
> comfortable with this since changing the system time could break something
> undesirably. Also I will then have to have root privilege to run my test.
> Besides, I will have to stop the ntp daemon so it will not inadvertently
> correct the system clock during the test period.
> 
> Is there any suggestion from the community on how best to test such
> functions?

It is a very bad idea to change the system date.



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 13:15:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 16:15:27 -0200
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
Message-ID: <op.up2qb1e7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.agadi at gmail.com> escribi?:

> I want to create zip file equivalent to java jar file,I created a zip
> file of my sources and added some __main__.py
> it says __Main__.py not found in Copyproject.zip..?

__main__.py must exist in the root directory.

-- 
Gabriel Genellina



From zaheer.agadi at gmail.com  Sat Feb 28 13:27:45 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 10:27:45 -0800 (PST)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
Message-ID: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>

On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> > I want to create zip file equivalent to java jar file,I created a zip
> > file of my sources and added some __main__.py
> > it says __Main__.py not found in Copyproject.zip..?
>
> __main__.py must exist in the root directory.
>
> --
> Gabriel Genellina

What do you mean by root directory..?What is this directory in
Windows..?You mean the top level folder of the project?in my case
copyproject folder..?


From lie.1296 at gmail.com  Sat Feb 28 13:33:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 05:33:38 +1100
Subject: Creating Zip file like java jar file
In-Reply-To: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
Message-ID: <49A98382.8000007@gmail.com>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>>
>>> I want to create zip file equivalent to java jar file,I created a zip
>>> file of my sources and added some __main__.py
>>> it says __Main__.py not found in Copyproject.zip..?
>> __main__.py must exist in the root directory.
>>
>> --
>> Gabriel Genellina
> 
> What do you mean by root directory..?What is this directory in
> Windows..?You mean the top level folder of the project?in my case
> copyproject folder..?

root directory is the topmost directory (imagine a tree, the root is
where all the branches branched from), in this case the root directory
is your copyproject main folder.



From lie.1296 at gmail.com  Sat Feb 28 13:33:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 05:33:38 +1100
Subject: Creating Zip file like java jar file
In-Reply-To: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
Message-ID: <49A98382.8000007@gmail.com>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>>
>>> I want to create zip file equivalent to java jar file,I created a zip
>>> file of my sources and added some __main__.py
>>> it says __Main__.py not found in Copyproject.zip..?
>> __main__.py must exist in the root directory.
>>
>> --
>> Gabriel Genellina
> 
> What do you mean by root directory..?What is this directory in
> Windows..?You mean the top level folder of the project?in my case
> copyproject folder..?

root directory is the topmost directory (imagine a tree, the root is
where all the branches branched from), in this case the root directory
is your copyproject main folder.


From lists at cheimes.de  Sat Feb 28 13:39:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 28 Feb 2009 19:39:35 +0100
Subject: How best to test functions which use date.today
In-Reply-To: <49A97A3D.6@gmail.com>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<49A97A3D.6@gmail.com>
Message-ID: <goc0d7$vg3$1@ger.gmane.org>

Lie Ryan wrote:
>> But this fails with:
>>
>> TypeError: can't set attributes of built-in/extension type
>> 'datetime.date'
> 
> This is because today is an attribute. In python, we can override
> attribute access to become a function call. I don't have python right
> now, but try this:
> 
> del date.today
> date.today = mytoday

It won't work. The datetime module is written in C. You can't modify a C
 extension.

Christian



From pafboing at gmail.com  Sat Feb 28 13:40:23 2009
From: pafboing at gmail.com (Christian R.)
Date: Sat, 28 Feb 2009 13:40:23 -0500
Subject: OTish: convince the team to drop VBScript
Message-ID: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>

Hello,

Brand new to this list, I've not found a quick way to search the
archives, and this is not a technical question.

I've just been hired at a digital signage company. They use VBScript
for simple-to-medium scripting. I've abandoned it about 8 years ago. I
want to convince the manager and the two programmers to switch to
Python. My main arguments for Python:
	- Faster
	- More powerful
	- Simpler syntax
	- More up-to-date, evolving
	- Modularity
	- Lots of open source modules
	- Better for development of "tools" (a goal stated by the mgr)

Not so sure:
	- Easier to integrate/translate with/into C#, which is what is used
there for complex development. Am I right?

The company does use Python on rare occasions. It all comes down to
the prejudices and habits of one of the programmers. His only argument
I can't counter -because I don't see the problem- is that "Python
modules cause problems for updates to customer's installations".

My major points will be:
	- Easier for all three of us
	- Stay up-to-date with industry. VBScript soon obsolescent.
	- Better for the company (state-of-the-art skills, think about the
future, assets re-use etc.)

Any details or added arguments are welcome. In advance, thanks!


From zaheer.agadi at gmail.com  Sat Feb 28 13:51:04 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 10:51:04 -0800 (PST)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
Message-ID: <c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>

On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
> zaheer.ag... at gmail.com wrote:
> > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> >>> I want to create zip file equivalent to java jar file,I created a zip
> >>> file of my sources and added some __main__.py
> >>> it says __Main__.py not found in Copyproject.zip..?
> >> __main__.py must exist in the root directory.
>
> >> --
> >> Gabriel Genellina
>
> > What do you mean by root directory..?What is this directory in
> > Windows..?You mean the top level folder of the project?in my case
> > copyproject folder..?
>
> root directory is the topmost directory (imagine a tree, the root is
> where all the branches branched from), in this case the root directory
> is your copyproject main folder.



I wonder, I do have the __main__.py  in the root directory,but still
getting
python.exe cannot find __main__.py in CopyProject.zip

I used the following command
python Copyproject.zip -m __main__.py --uploadFile and also tried with
python Copyproject.zip --uploadFile
both give me the same error , I can see the sys.path contains the
project folder.


From rayvd at bludgeon.org  Sat Feb 28 13:56:11 2009
From: rayvd at bludgeon.org (Ray Van Dolson)
Date: Sat, 28 Feb 2009 10:56:11 -0800
Subject: Python alternatives to Text::SimpleTable?
Message-ID: <20090228185611.GA29288@bludgeon.org>

So I'm looking for an easy (read: lazy) way to generate output in nice
ASCII tables like the Text::SimpleTable[1] module in perl.  I've come
across two so far in the Python world that look promising[2][3] but I'm
wondering if anyone else out there has some recommendations for me.

Thanks,
Ray

[1] http://search.cpan.org/dist/Text-SimpleTable/lib/Text/SimpleTable.pm
[2] http://pypi.python.org/pypi/text_table/0.02
[3] http://jefke.free.fr/stuff/python/texttable/


From nytrokiss at gmail.com  Sat Feb 28 13:58:26 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sat, 28 Feb 2009 20:58:26 +0200
Subject: ANN: updates to Python-by-example
In-Reply-To: <49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
	<mailman.903.1235745632.11746.python-list@python.org>
	<49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>
Message-ID: <8a6b8e350902281058k6228a721s9c90e1fba123eed3@mail.gmail.com>

Thanks for adding this. I needed to show someone some examples...

On Fri, Feb 27, 2009 at 5:35 PM, steven.oldner <steven.oldner at gmail.com>wrote:

> On Feb 27, 8:40 am, pyt... at bdurham.com wrote:
> > Rainy,
> >
> > Great stuff! Thanks for your examples with the community!!
> >
> > Regards,
> > Malcolm
>
> Let me add my thanks!  I using it now...
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From lists at cheimes.de  Sat Feb 28 13:59:50 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 28 Feb 2009 19:59:50 +0100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A989A6.5080605@cheimes.de>

Christian R. schrieb:
> Hello,
> 
> Brand new to this list, I've not found a quick way to search the
> archives, and this is not a technical question.
> 
> I've just been hired at a digital signage company. They use VBScript
> for simple-to-medium scripting. I've abandoned it about 8 years ago. I
> want to convince the manager and the two programmers to switch to
> Python. My main arguments for Python:
> 	- Faster
> 	- More powerful
> 	- Simpler syntax
> 	- More up-to-date, evolving
> 	- Modularity
> 	- Lots of open source modules
> 	- Better for development of "tools" (a goal stated by the mgr)

- Heavily used by lots of large companies and major players like Google,
NASA, CERN ... Check out http://www.python.org/about/success/

> Not so sure:
> 	- Easier to integrate/translate with/into C#, which is what is used
> there for complex development. Am I right?

Well, there are IronPython and PythonDotNET. The former ist a full blown
implementation of Python in .NET sponsored by Microsoft and part of the
next release of Visual Studio. The later is a bridge between .NET and
CPython.

Christian



From nytrokiss at gmail.com  Sat Feb 28 14:01:27 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sat, 28 Feb 2009 21:01:27 +0200
Subject: What's so wrong about execfile?
In-Reply-To: <c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>
References: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>
	<c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>
Message-ID: <8a6b8e350902281101h2f1b17b9ud8268e0480b7b0d5@mail.gmail.com>

It is considered one of the big holes in PHP (Remote file include...)
However in Python things can be done securely

On Sat, Feb 28, 2009 at 7:15 AM, Carl Banks <pavlovevidence at gmail.com>wrote:

> On Feb 27, 7:21 pm, Sammo <sammo2... at gmail.com> wrote:
> > Given that execfile has been removed in py3k, I want to understand
> > exactly why.
> >
> > Okay, I get that execfile is bad from the following thread:
> >
> > On Jul 29 2007, 2:39 pm, Steven D'Aprano
> >
> >
> >
> > <st... at REMOVE.THIS.cybersource.com.au> wrote:
> > > (1) Don't use eval, exec or execfile.
> >
> > > (2) If you're an expert, don't use eval, exec or execfile.
> >
> > > (3) If you're an expert, and are fully aware of the security risks,
> don't
> > > use eval, exec or execfile.
> >
> > > (4) If you're an expert, and are fully aware of the security risks, and
> > > have a task that can only be solved by using eval, exec or execfile,
> find
> > > another solution.
> >
> > > (5) If there really is no other solution, you haven't looked hard
> enough.
> >
> > > (6) If you've looked REALLY hard, and can't find another solution, AND
> > > you're an expert and are fully aware of the security risks, THEN you
> can
> > > think about using eval, exec or execfile.
> >
> > What are some of the reasons why execfile should not be used?
> >
> > What are some examples of cases where execfile is the correct way of
> > doing something?
>
> You didn't quote the context of Steven's reply, so I don't know if he
> was talking in general, or for a particular situation.  I suspect it
> was the latter, though.
>
> Anyway, there is one generally valid use case for these three: when
> it's your deliberate intention to give the user the power to run
> arbitrary Python code.  If you really want to give the user this
> power, and the user is trusted on whatever machine they are running it
> on, go ahead and use it.  No apology necessary.
>
> [For instance, the package I use to generate my web site uses exec and
> eval, because it processes templates with embedded Python code.  It's
> all generated statically, on my own desktop, and I author all the
> pages myself, so there is no security risk.  If I were to distribute
> this package (and I do, though not many people use it, because
> everyone just writes their own HTML templates), there would be no risk
> because the user is expected to be able to run Python, and if they can
> be trusted to run Python on their own system, they can be trusted to
> run my program, which execs templates that they write themselves.]
>
> I would suggest, however, that even if that is your intention that you
> consider leveraging Python's built-in import infrastructure.  Instead
> of execfile, you could have your program simply import a module the
> user writes (after adding a user-specific directory to sys.path).
>
>
> Now, here are a few situations where you should follow Steven's advice
> above (i.e., don't, ever):
>
> - Don't ever use exec or eval to construct a variable name
> dynamically.  Don't ever do this, for instance:
>
> x = eval("self","%s%d" % (name,index))
>
> This is unforgiveable.  Python has better and safer ways to do this
> (use getattr, setattr, globals, and locals built-ins).  And if you
> find yourself using them a lot, it's a red flag that you should be
> using dicts instead.
>
> - Don't ever pass any data to exec or eval that you didn't either
> write, or thoroughly inspect, yourself.  Especially don't pass it any
> data you received over the network.  You have to be the super extreme
> expert that Steven described, and own a lot of liability insurance,
> befor you can do that.
>
>
> Carl Banks
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From pataphor at gmail.com  Sat Feb 28 14:02:38 2009
From: pataphor at gmail.com (pataphor)
Date: Sat, 28 Feb 2009 20:02:38 +0100
Subject: KeyedList
Message-ID: <20090228200238.0b7dd7f1@hyperspace>

The ordered dictionary discussion made me think of another data type
which seems to be somewhat related, a kind of ordered dictionary where
the order of the items is arbitrary. One can insert items in the middle
and still have O(1) access (I think). I have provided a very basic
implementation, it could be extended to also remove items with O(1)
access. I am wondering if the idea makes sense at all and what would be
the best name for the type itself and for its methods. 

Could it be that the ordered dictionary is a result of a way of
thinking which slowly extends what we currently have, while a
KeyedList or whatever we ultimately choose to name it is the kind of
data type we are really looking for? If accepted, I think this type
could be used for Knuth's dancing links style algorithms.

P.

#warning, embryonic, probably very buggy implementation

class Node:
    
    def __init__(self, left = None, right = None, key = None, item =
None): self.left = left
        self.right = right
        self.key = key
        self.item = item

class KeyedList:
    
    def __init__(self):
        self.first = Node()
        self.last = Node()
        self.last.left = self.first
        self.first.right = self.last
        self.D = {}
    
    def append(self, key, item):
        last = self.last
        prev = last.left
        x = Node(prev,last,key,item)
        prev.right = x
        last.left = x
        self.D[key] = x
    
    def insertafter(self,key1,key2,item):
        left = self.D[key1]
        right = left.right
        x = Node(left,right,key2,item)
        left.right =x
        right.left =x
        self.D[key2] = x
    
    def iteritems(self):
        x = self.first.right
        while x.right:
            key = x.key
            yield key, self.D[key].item
            x = x.right
        
def test():
    K = KeyedList()
    K.append('one','hello')
    K.append('two','hello')
    K.append('four','hello')
    K.insertafter('two','three','hello')
    for x in K.iteritems():
        print x
    
if __name__ == '__main__':
    test()


From kwmsmith at gmail.com  Sat Feb 28 14:08:07 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Sat, 28 Feb 2009 13:08:07 -0600
Subject: Data Coding suggestions
In-Reply-To: <74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
	<477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>
	<74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>
Message-ID: <c266a7930902281108p57fa5d80j63ac98e4c3cd21f4@mail.gmail.com>

On Sat, Feb 28, 2009 at 10:08 AM, steven.oldner <steven.oldner at gmail.com> wrote:

>
> Thanks guys. ?While shopping today I've thought of a few more columns
> for my data so my first item will be building the 3 DB tables and a
> way to populate them. ?Since this was intended to automate what I do
> on a weekly basis, I didn't think about adding recipes since I know
> what I need for the family, but that's a good touch.
>
> Item 1. Build 3 db tables
> Item 2. Build app to populate tables.
> Item 3. Build app to read tables and print lists.
>
> Anything else?

You might take a look at the source code for the Gourmet Recipe Manager

http://grecipe-manager.sourceforge.net/

It's written in python, has a persistent database (not sure if using
sqlite3) and you might be able to adapt it to your needs.

We use it for our shopping lists here and it's great.

Kurt


From benjamin.kaplan at case.edu  Sat Feb 28 14:10:24 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 28 Feb 2009 14:10:24 -0500
Subject: TypeErrors
In-Reply-To: <260144.62922.qm@web33003.mail.mud.yahoo.com>
References: <260144.62922.qm@web33003.mail.mud.yahoo.com>
Message-ID: <ec96e1390902281110n1c7df7uec96ae87a7a7add9@mail.gmail.com>

On Sat, Feb 28, 2009 at 12:24 PM, Sean Novick <daddysean23 at yahoo.com> wrote:

> I'm having issues with a phone-number database.
> Here is a code snippet:
>  def menu():
>
>         print '''Please make a selection from the following options:
>         To add an Employee - enter: 1
>
>         For a complete listing of Employees - enter: 2
>         To see the 'test page' and exit the database - enter: 3'''
>         print
>         return input(":")
> #Start of Program
>     foo = phonedb()
>     loop = 1
>     choice = 0
>     while loop == 1:
>         choice = menu()
>         if choice == 1:
>             print "Enter the Employee's full name: "
>             n = raw_input(':')
>             print "Enter the Employee's full telephone number: "
>             p = raw_input(':')
>             print "Enter the telephone number type:(0 = UNKNOWN, 1 = HOME,
> 2 = WORK, 3 = FAX, 4 = CELL)"
>             t = raw_input(':')
>             if t == '0':
>                 foo.add(n, p, UNKNOWN)
>             if t == '1':
>                 foo.add(n, p, HOME)
>             if t == '2':
>                 foo.add(n, p, WORK)
>             if t == '3':
>                 foo.add(n, p, FAX)
>             if t == '4':
>                 foo.add(n, p, CELL)
>                 print t
>
>         elif choice == 2:
>             print(list)
>
>         loop = 0
> It works until I enter "t", then this is what I get:
> "Please make a selection from the following options:
>         To add an Employee - enter: 1
>
>         For a complete listing of Employees - enter: 2
>         To see the 'test page' and exit the database - enter: 3"
> :1
> Enter the Employee's full name:
> :john
> Enter the Employee's full telephone number:
> :123-456-7890
> Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX,
> 4 = CELL)
> :1
> First lookup:
> Traceback (most recent call last):
>   File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
>     class phonedb:
>   File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
>     for entry in foo.lookup('reifsch'):
>   File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
>     if cmp(e, string) == 0:
> TypeError: comparison did not return an int
> >>>
> I do not know what this error means. I tried to look it up in help, but to
> no avail. If someone could please help or tell me where I could find an
> answer. Thanks.
>


Do you see the little part where it tells you? Your problem has nothing to
do with the stuff you showed us. It took place in
simple database.py, line 101. At the point "if cmp(e, string) == 0". First
of all, why are you doing cmp(e,string)==0? Use  "if e == string" instead.
It's the same thing (sometimes even calls the same code), but it's easier to
read. The problem was exactly what it said: the __cmp__ method in whatever
class e is needs to return an int. It isn't, so you get this problem Also,
in new code, it's considered better to use rich comparisons (__eq__, __ne__,
etc.) rather than __cmp__. That's another reason to use e == string. If e
uses __eq__, == will work. If e uses __cmp__, == will still work.
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From kmcbrearty at yahoo.com  Sat Feb 28 14:13:35 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Sat, 28 Feb 2009 11:13:35 -0800 (PST)
Subject: Static Map
Message-ID: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>

Hello,

I'm interested in creating a static map of a region in the US.  This
map would be set into a picture format, so I can add it to a
document.  I would like it to contain some town names and road
information.  Then I would like to add points, based on LAT and LONG,
that can be labeled with information I provide.

I have done some searching, Google Maps probably will not work because
of the License.  WuGeo does not seam to have the details.  I was
considering tw.openlayers, but do not know if that is the best
starting point.  If I could not create the picture from Python, would
use tw and then create a screen shot to get started.

Does anyone have thoughts on a better approach?

KMCB


From mail at timgolden.me.uk  Sat Feb 28 14:15:40 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 28 Feb 2009 19:15:40 +0000
Subject: c.Win32_OperatingSystem question.
In-Reply-To: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
References: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
Message-ID: <49A98D5C.2090408@timgolden.me.uk>

bryan rasmussen wrote:
> Maybe there's a more specific list I should ask this question on but I
> don't know what it is. I'm using Tim Golden's wmi stuff, and putting
> my output into an XML document.
> 
> I have the following bit of code
> 
[.. snip ...]
> 
> At the end of that thhe only text node thaht comes out is
> ComputerName, WMI is running - Am I using the wrong names for things
> here? When I try to get the same values using WScript and WQL to
> extract from Win32_OperatingSystem I get all the values.


I'd love to help here, but you're not making it easy. I'm not
clear if you're suggesting there's a problem with WMI or with
ElementTree or with something else. Can you narrow down, please
so I don't have to invent a code wrapper for your code fragment.
Try producing an instantly-runnable piece of code which demonstrates
the problem and I'll happily have a look from the WMI perspective at
least.

TJG


From rdmurray at bitdance.com  Sat Feb 28 14:46:00 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 19:46:00 +0000 (UTC)
Subject: why cannot assign to function call
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
	<87myc6oee7.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <goc49o$b8n$1@ger.gmane.org>

Mark Wooding <mdw at distorted.org.uk> wrote:
> Ethan Furman <ethan at stoneleaf.us> writes:
> 
> > Mark Wooding wrote:
> >> Here's what I think is the defining property of pass-by-value [...]:
> >>
> >>   The callee's parameters are /new variables/, initialized /as if by
> >>   assignment/ from the values of caller's argument expressions.
> >>
> >> My soundbite definition for pass-by-reference is this:
> >>
> >>   The callee's parameters are merely /new names/ for the caller's
> >>   argument variables -- as far as that makes sense.
> >
> > Greetings, Mark!
> 
> You posted to the whole group -- probably using a wide-reply option
> while reading the mailing list.  Still, I'll give an answer here in
> order to help any other readers of the list or newsgroup.  However, as
> far as I'm concerned, this discussion is basically at an end and I'm not
> really interested in starting it up all over again.  To that end, I've
> set followups to `poster'.  I shall continue reply to private email
> which seems interested in a sensible discussion.

I just popped in to this thread, and read the whole thing in a marathon
session (why, I'm not quite sure, but somehow I found it interesting :).
I'm going to follow up here at the risk of annoying Mark, because I
think there may be a way to reconcile the language in a way that is
helpful in explaining things to Python beginners.

> > I was hoping you might be able to clarify those last two sound bites
> > for me -- I think I understand what you are saying, but I'm confused
> > about how they relate to Python...

I think this is the key point.  I am an experienced Python programmer,
and I had to think long and hard about what you were saying, Mark, in
order to understand how it applied to Python.  I think this means that
your model and/or your level of abstraction is not "natural" when trying
to understand Python programs, and I think I may have figured out why.

> > Specifically, how is a new name (pbr) different, in Python, from a new
> > name initialized as if by assignment (pbv)?  It seems to me than you
> > end up with the same thing in either case (in Python, at least),
> > making the distinction non-existent.
> 
> You've missed a level of indirection.  In particular, `names' aren't
> things that you initialize.  They're things that you /bind/ to
> variables.  The crucial difference is that, in pass-by-value, new
> variables are created as an intrinsic part of the process, whereas in
> pass-by-reference, new variables are not (usually) created, and instead
> the formal parameter names are bound to the caller's pre-existing
> argument variables.

I think that the reason Ethan missed that level of indirection is that
Python hides that level of indirection from the programmer.  And I think
that this is where the conversation between you and Steven got hung
up, Mark.  You are firmly grounded in how languages work in general,
so your conceptual model naturally includes details that Steven's
conceptual model can ignore, because he's dealing only with the model
used by Python.  He can (and wants to!) ignore the level of indirection
that Python doesn't even give him access to.

In short, there is a reason why you almost never hear the word 'variable'
from an experienced Python programmer when talking about the Python model.
That level detail is abstracted into something else by the Python
conceptual model: it becomes a namespace mapping names to objects.

> It's worth noting that I use the terms `name' and `binding' in different
> ways from most of the Python community.  This is unfortunate.  The
> discrepancy is actually because the Python meanings of these words are
> not the same as the meanings in the wider computer science and
> mathematical communities.  For example, many Python users seem to use
> `binding' to mean `assignment', which is a shame because it leaves the
> concept that is usually called `binding' without a name.  So I'll stick
> with the wider meanings.

It seems to me from reading the thread that everyone is actually in
pretty good agreement that 'name' is the symbol one types in the
program source to denote...something.  It's the something where things
get tricky.  So let's leave name itself alone.

But let's replace 'assignment' and 'binding' with the concept that is
more natural to Python's model, that of a "mapping".  A namespace maps
names to objects.  If I'm understanding you correctly, Mark, in your
model what I'm calling a namespace is the set of variable bindings in a
particular environment.  Because Python does not allow the programmer
to actually rebind a variable (Python handles the association between
name and variable completely behind the scenes), Python programmers
naturally skip past that name-to-variable binding step, and conceptually
think about the name being bound to the _value_ instead. After all,
that's the only thing they can change.  This may be unfortunate from
a precisionist viewpoint, but it is both natural and, IMO, inevitable,
because it makes thinking about Python programs more efficient.

> A while ago, I posted an essay -- to this group -- which may help
> explain the concepts:
> 
>         Message-ID: <8763k14nc6.fsf.mdw at metalzone.distorted.org.uk>
>         http://groups.google.com/group/comp.lang.python/msg/f6f1a321f819d02b
> 
> On with the question.
> 
> > def func(bar):
> >     bar.pop()
> >
> > Pass-by-reference:
> >   foo = ['Ethan','Furman']
> >   func(foo)			# bar = foo
> >
> > Pass-by-value:
> >   foo = ['Python','Rocks!']
> >   func(foo)			# bar is new name for foo
> > 				# is this any different from above?
> >
> > If I have this right, in both cases foo will be reduced to a
> > single-item list after func.  
> 
> You're correct.  So: we can conclude that the above test is not
> sufficient to distinguish the two cases.

Suppose we recast this by saying that the function has a namespace,
and in that namespace 'bar' maps to something.  What that something is
depends on what is passed in that argument position when func is called.
The calling code's namespace maps 'foo' to something.  When func is
called, a mapping to that same object is set up in func's namespace,
under the name 'bar'.

In Python's conceptual model it doesn't make any sense to ask if
the argument is passed by value or by reference.  In reality, if I'm
understanding you correctly Mark, you are absolutely correct that the
'variable' (the thing actually pointed to by 'name', which is a storage
location that contains a pointer to an object) is passed by value.
That is, the contents of the storage location that the caller's 'foo'
is pointing to is copied into a new storage location that the callee's
'bar' points to.  Conceptually, however, that is an implementation detail.
Conceptually, the important thing is that a _new mapping_ in a _different
namespace_ is set up to the _same object_.  That is the semantics that
Python the language defines.

As Steven said, talking about variables seems to be drilling down into
a level of abstraction that is more confusing than it is helpful when
you are actually _programming_ in Python.  It can be a useful level of
abstraction to talk about when trying to explain what is happening to
someone with previous experience of other languages, but it isn't useful
(in my experience) for everyday Python programming.

The reason that is true is because in Python there is _no way_ to get
a second reference to the 'variable' that is pointed to by 'foo' or by
'bar'.  (Unless you walk into that secret back room, of course, and even
then it is hard, I think.)  As I said, Python hides that level of detail
from the programmer.  This means that it effectively does not exist when
you program Python, and _this_ is why we get all tangled up in language
when we try to discuss it.  You, Mark, had to go to great lengths to
define your terms, and still a lot of people didn't get it, because in
actual, on-the-ground Python programming, variables just don't enter in to
it, because they can not be directly manipulated from the Python program.

I suspect that the longer one has been a Python programmer, the harder
it is to even see this blind spot, and thus the harder it is to respond
sensibly to someone new to Python whose conceptual model includes
variables that _can_ be accessed and manipulated from the program.  I know
_I_ had to read and re-read your posts before I finally figured it out
(assuming I have!).  (FYI, my programming learning path was roughly
Basic->FORTRAN ->LISP->assembler->C->Python, and I've been programming
Python since 1993 or thereabouts).

(BTW, I am not claiming Python is unique in this regard, I'm just talking
about how it looks from inside the Python programming mindset.)

> > Any further explanation you care to provide will be greatly
> > appreciated!
> 
> This test is sufficient to distinguish:
> 
>         def test(x):
>           x = 'clobbered'
> 
>         y = 'virgin'
>         test(y)
>         print y
> 
> If it prints `virgin' then you have call-by-value.  If it prints
> `clobbered' then you have call-by-reference.

Or if you think in terms of namespace mappings, 'test' cannot change what
'y' is mapped to in the caller's namespace, because (in this function)
it has no mapping to that namespace object.  It _can_ make changes to
the thing that y is mapped _to_, if that thing is mutable.  That's the
most useful way to think about it that I've found.  Your reasoning about
variables and call-by-reference and call-by-value, while correct and
enlightening at the computer science level, confuses me and makes me
less efficient if I think about it while writing a Python program.

> Let's examine the two cases, as I did in the essay I cited above.  I'll
> do call-by-value first.  First, we define a function `test'.  Then, we
> initialize `y'.  It's worth examining this process in detail.  The name
> `y' is initially unbound. so it is implicitly bound to a fresh
> variable.  Then, (a reference to) the string object 'virgin' is stored
> in this variable.  We can show this diagrammatically as follows.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
>
> (In the diagrams, ===> denotes a binding relationship, between names and
> variables; and ---> denotes a reference relationship, between variables
> and values.)

This diagram is IMO accurate and correct.  However, in Python we can
never actually touch [VAR] except insofar as we change the right hand
side element of the diagram.  And we can only do _that_ if we have access
to the object that is the global name space, and we mutate that object.
So for reasoning about Python programs, I think like this:

        y (in global namespace) ---> 'virgin'

> Next, we call the `test' function.  Call-by-value says that we must
> evaluate the argument expressions.  There's only one: `x'.  The value of
> a name is obtained by (a) finding which variable is bound to the name,
> and (b) extracting the value from this variable.  Well, the variable is
> the one we just bound, and the value stored is (the reference to) the
> string 'virgin'.  So the result of evaluating the argument expressions
> is simply (the reference to) that string.
>
> The function has one parameter, `y'.  A new environment is constructed
> by extending the global environment.  In this new environment, the name
> `y' is bound to a fresh variable -- distinct from all others, and
> especially from the variable bound to `x' -- and in that variable we
> store the value of the corresponding argument expression.  Result: the
> function body is executed in an environment which is like the global
> environment except that `y' is bound to a fresh variable containing
> 'virgin'.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
>                                                   ^
>                                                   |
>         x (in function `test') ====> [VAR] -------'

I would describe this (in Python) as follows: we call the test function,
passing it x.  This means we find the object that x is mapped to in
the caller's namespace, and we map 'y' in the function's namespace
to the same object:

          y (in global env.) ---> 'virgin'
                                    ^
                                    |
          x (in function 'test') ---'

> Now there's an assignment
> 
>           x = 'clobbered'
> 
> The name `x' is already bound to a variable.  So we modify that variable
> so that it stores (a reference to) the string 'clobbered'.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
> 
>         x (in function `test') ====> [VAR] ---> 'clobbered'

Assignment in Python changes a mapping (mutates a namespace object). In
this case the mapping being changed is the local function's namespace
mapping.  We can't affect the caller's namespace mapping, because (in
this function) we don't have access to the caller's namespace object.
So I would diagram it like this:

         y (in global env.)  -----> 'virgin'

         x (in function 'test')  ----> 'clobbered'

> And then the function ends.  The environment we constructed is
> forgotten.  The variable bound to `x' is lost forever, since it wasn't
> bound to any other name.  Since modifying that variable was the only
> action carried out in the function, and the variable is now lost, there
> is no externally observable effect.  When we finally print `y', we see
> `virgin', because the variable bound to `y' was unchanged.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'

The function's local namespace is not accessible to the caller, so the
caller can't access the object 'clobbered'.  Its own namespace mapping
is unchanged.  The object 'virgin' is unchanged.  So the caller sees no
change as a result of calling the function.

Now, to demonstrate that this model of namespaces-as-mappings (and
first level objects themselves) is more useful to the Python programmer
than the accurate but too-low-level description in terms of variables,
consider this:

    >>> def test(x):
    ...     x = 'clobbered'
    ...     return locals()
    >>> y = 'virgin'
    >>> ns = test(y)
    >>> print y
    virgin
    >>> print ns['x']
    clobbered

In other words, while thinking about 'variables' and 'pass by value' is
_accurate_, it does not add anything to the conceptual model a programmer
needs in order to understand and write Python code.  Namespaces as first
level objects that map names to values, however, is an extremely useful
and powerful mental model for programming in Python.  The two concepts are
conceptually equivalent regardless of implementation details (assuming we
say a namespace immutably associates names with variables, which in turn
mutably point to values), but the namespace, IMO, is the more useful of
the two when reasoning about Python programs.

> So much for call-by-value.  How about call-by-reference?  Well,
> everything is the same until the actual call.  But then everything
> changes.
> 
> Firstly, call-by-reference /doesn't/ evaluate the argument expressions.
> Instead, we just note that `y' is bound to a particular variable in the
> global environment.  The function has a single parameter `x'.  A new
> environment is constructed by extending the global environment (again):
> in this new environment, the name `x' is bound to /the same variable/
> that `y' is bound to in the global environment.
> 
>         y (in global env.)  ====>  [VAR]  <===== x (in function `test')
>                                      |
>                                      |
>                                      v
>                                  'virgin'

And this is something that you can _never_ do in Python (short of
mindbogglingly bad hackery).  I know you know that, but the fact that
you _cannot_ do it is why people start getting confused when talking
about call-by-reference vs call-by-value in a Python context.

> Now we assign to `x'.  The detailed rules are the same: `x' is bound, so
> we modify the variable it's bound to, so that it stores 'clobbered'.
> But this time, the variable being clobbered is the /same/ variable that
> `y' is bound to.  So finally, when we print `y', we see the string
> 'clobbered.
> 
> 
>         y (in global env.)  ====>  [VAR]  <===== x (in function `test')
>                                      |
>                                      |
>                                      v
>                                 'clobbered'
> 
> Now, let's look at your example.
> 
> > def func(bar):
> >     bar.pop()
> >
> >   foo = ['Ethan','Furman']
> >   func(foo)			# bar = foo
> 
> I won't describe this in the same excruciating detail as I did for the
> one above; but I will make some observations.
> 
> In call-by-reference, the environment in which the body of `func' is
> executed is constructed by extending the global environment with a
> binding of the name `bar' to the same variable as is bound to `foo' in
> the global environment.  There is only the one variable, so obviously
> both names (considered as expressions) must evaluate to the same value.
> I won't go into the details of method invocation, which in Python is
> quite complicated; but `bar.pop()' mutates this value: it modifies it in
> place.  So, when the function returns, `foo' can be seen to print
> differently.  The value is, in some sense, the /same/ value as it was
> before, in that it occupies the same storage locations, but the contents
> of those storage locations has been altered.
> 
>               foo =====> [VAR] <===== bar
>         (in global env)    |    (in function `func')   
>                            |
>                            v
>                    ['Ethan', 'Furman']

And just to be crystal clear, the above case is _not_ the one Python does.

> In call-by-value, `func' executes in an environment constructed by
> extending the global environment with a binding of `bar' to a /fresh/
> variable.  This fresh variable is then initialized: we store the value
> of the argument expression `foo' into it.  This value is a reference to
> the list ['Ethan', 'Furman'].  (See, I've stopped parenthesizing the
> reference stuff, because here it really matters.)  So, we have two
> variables, bound to `foo' and `bar', but both variables refer to the
> same list object.  The body of `func' doesn't modify any variables;
> rather, it mutates the list object in place (as above).  Since both
> variables refer to the /same/ list object, this mutation is still
> observable outside of the function.
> 
>               foo =====> [VAR] ---> ['Ethan', 'Furman']
>         (in global env)                     ^
>                                             |
>               bar =====> [VAR'] ------------'
>         (in function `func')

And for reasoning about Python programs, I would write this diagram
(which _is_ the way Python does it) as:

                foo ---> ['Ethan', 'Furman']
          (in global namespace)  ^
                                 |
                bar  ------------'
          (in 'func' namespace)

> So the reason that your example doesn't distinguish the two cases is
> because, in both cases, there's still only one value, which is mutated.
> But there is a conceptual difference, unobservable in this instance,

Unobservable in Python because Python gives the programmer no way to
create two pointers to the same '[VAR]'.

> because call-by-reference has two names bound to the same variable,
> while call-by-value has two names, bound to /distinct/ variables but
> which both refer to the same value.
> 
> Finally, it may be instructive to remove the issue of function calling
> altogether.  Consider:
> 
>         foo = ['Ethan', 'Furman']
>         bar = foo
>         bar.pop()
> 
> What is the final value of `foo'?
> 
> Now:
> 
>         x = 'virgin'
>         y = x
>         y = 'clobbered'
> 
> What is the final value of `x'?
> 
> Are you enlightened?

Hopefully so!  Your explanation of the underlying mechanics of call by
reference and call by value is the best I've ever seen, and all that
effort you put in to defining your terms earlier in this thread has
ultimately paid off.

Although this has been long enough already (especially since I quoted
your excellent article in full), I still want to go on a bit more.
I want to demonstrate the explanatory power of the namespace model,
which was one of your arguments with Steven: that his model of Python
working directly with values couldn't explain certain things.

On of the examples you gave (and I'm doing this from memory) was this:

    >>> l = [ lambda: x for x in [1,2,3] ]                                                                                                                                                                          
    >>> [ f() for f in l ]
    [3, 3, 3]

Your explanation was in terms of variables and environments, and frankly I
had a hard time following it (though I get it now).  Here's how I explain
it in terms of namespaces: lambda creates a closure, and part of the
closure is a reference to the locals namespace object that exists when the
closure is formed.  The (top level of the) list comprehension is operating
in the local namespace, so it is this namespace that gets captured inside
the closure.  When we execute the functions later, what happens is that
'x' is looked up in this namespace, and the object that _it maps to at
that time_ is returned.  Since the last assignment (mapping) to X was
to the object '3', '3' is what is returned by all three functions calls.

The code above is equivalent to the following code, which makes is
clearer what is happening:

    >>> l2 = []
    >>> for x in 1,2,3:
    ...     l2.append(locals())
    >>> [ ns['x'] for ns in l2 ]
    [3, 3, 3]

So in terms of namespaces it is crystal clear why we get three 3s,
and why the following produces three 5s:

    >>> x = 5
    >>> [ ns['x'] for ns in l2 ]
    [5, 5, 5]
    >>> [ f() for f in l ]
    [5, 5, 5]

This is conceptually equivalent to your variables and environments model,
but I think it is easier to understand and reason about, when talking
only about Python code, because it elides that level of indirection to
which the Python programmer has no access.  At least, I find it so!

To take the final step toward unifying your view with Steven's view,
we have to admit that Python objects that reference other objects can be
viewed either as having [VAR] elements containing pointers to objects,
or as namespaces referencing other objects, and that these two views
are conceptually equivalent.

Thus, take your circular list example:

    >>> a [1, 2, 3]
    >>> a[1] = a
    >>> a
    [1, [...], 3]

Your view was that this list must contain a pointer variable which points
to the list itself (a reference), while Steven held that Python lists
reference other objects directly, and had no problem with this Tardis-like
construct.  You are obviously correct that what a list is is a sequence of
variable slots that can point to any object, including the list itself.
But we can also view the list as a namespace whose name elements are a
zero-origined, monotonically increasing set of integers, and that within
this name space these names map directly to python objects.

In Python (or at least in CPython), the two views are equivalent.  But I
argue, with Steven, that the latter view is more _useful_ for a Python
programmer, and that it is in fact Python's conceptual model.

I would also argue that the latter view is the one that it is more
helpful to explain to newcomers to Python, with due acknowledgement
being made to the reality of the behind-the-scenes variables for those
coming from a background where that will be helpful.  The trick is to
get the long-time Python programmers to remember, when talking to such
a newcomer, that those variables even exist!

--RDM



From rdmurray at bitdance.com  Sat Feb 28 15:07:44 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:07:44 +0000 (UTC)
Subject: TypeErrors
References: <260144.62922.qm@web33003.mail.mud.yahoo.com>
Message-ID: <goc5ig$d9f$1@ger.gmane.org>

Sean Novick <daddysean23 at yahoo.com> wrote:
> First lookup:
> Traceback (most recent call last):
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
> 			 class phonedb:
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
> 			 for entry in foo.lookup('reifsch'):
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
> 			 if cmp(e, string) =3D=3D 0:
> TypeError: comparison did not return an int
>
> I do not know what this error means. I tried to look it up in help, but to no
> avail. If someone could please help or tell me where I could find an answer.
> Thanks.

The 'cmp' function (which is depricated, by the way) asks the two
arguments to compare themselves.  It does this by invoking the __cmp__
method on the first object, passing it the second.  (Actually it's more
complicated than that, but it will do as a partial explanation for now).
The __cmp__ method is expected to return an integer, which represents
the results of doing the comparison (see the docs if you want to know
the values...but as I said cmp and __cmp__ a depricated).

So, whatever 'e' is (and we can't tell from the traceback, you'll have
to work through your code to figure it out, probably by sprinkling in
'print' statements), its __cmp__ method didn't return an integer.

When you fix this, I would recommend converting to using rich comparisons
(__eq__, __lt__), etc, since __cmp__ is eventually going away (it doesn't
exist in Python 3.x).

--RDM



From rdmurray at bitdance.com  Sat Feb 28 15:19:36 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:19:36 +0000 (UTC)
Subject: OTish: convince the team to drop VBScript
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <goc68o$gat$1@ger.gmane.org>

"Christian R." <pafboing at gmail.com> wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

You don't really need arguments so much as you need negotiation, people
management and (ugh) political skills, I think.  Your task is to overcome
his prejudices, and you aren't going to do that with arguments, no matter
how good.

IMO the first thing you ought to do is dig in, really listen, and find
out what his issue is with module distribution.

Listening well is your most powerful asset.  Overcome your own prejudices
first, and his may follow :)

--RDM



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 15:32:05 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 18:32:05 -0200
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
	<c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>
Message-ID: <op.up2wnr0tx6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 16:51:04 -0200, <zaheer.agadi at gmail.com> escribi?:
> On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
>> zaheer.ag... at gmail.com wrote:
>> > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
>> > wrote:
>> >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com>  
>> escribi?:
>>
>> >>> I want to create zip file equivalent to java jar file,I created a  
>> zip
>> >>> file of my sources and added some __main__.py
>> >>> it says __Main__.py not found in Copyproject.zip..?
>> >> __main__.py must exist in the root directory.
>>
>> > What do you mean by root directory..?What is this directory in
>> > Windows..?You mean the top level folder of the project?in my case
>> > copyproject folder..?
>>
>> root directory is the topmost directory (imagine a tree, the root is
>> where all the branches branched from), in this case the root directory
>> is your copyproject main folder.
>
> I wonder, I do have the __main__.py  in the root directory,but still
> getting
> python.exe cannot find __main__.py in CopyProject.zip

The top of the tree inside the zip file. Depth zero. Not inside any  
directory. Above anything else. Just a bare name.

Open your zip using the zipfile module:

import zipfile
z = zipfile.ZipFile("xxx.zip")
z.printdir()

You should see a line starting with __main__.py *without* any / in it.

> I used the following command
> python Copyproject.zip -m __main__.py --uploadFile and also tried with
> python Copyproject.zip --uploadFile

Use the second one.

> both give me the same error , I can see the sys.path contains the
> project folder.

Uh? Which project folder? Isn't it in the .zip?

-- 
Gabriel Genellina



From rdmurray at bitdance.com  Sat Feb 28 15:34:35 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:34:35 +0000 (UTC)
Subject: How best to test functions which use date.today
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<49A97A3D.6@gmail.com> <goc0d7$vg3$1@ger.gmane.org>
Message-ID: <goc74q$ivh$1@ger.gmane.org>

Christian Heimes <lists at cheimes.de> wrote:
> Lie Ryan wrote:
> >> But this fails with:
> >>
> >> TypeError: can't set attributes of built-in/extension type
> >> 'datetime.date'
> > 
> > This is because today is an attribute. In python, we can override
> > attribute access to become a function call. I don't have python right
> > now, but try this:
> > 
> > del date.today
> > date.today = mytoday
> 
> It won't work. The datetime module is written in C. You can't modify a C
>  extension.

Hmm.  Given that, Lie, maybe what you need to do is modify your code
so that you call your own special purpose function to get 'today',
and replace _that_ for testing, using datetime's today for production.

--RDM



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 15:38:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 18:38:01 -0200
Subject: How best to test functions which use date.today
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
Message-ID: <op.up2wxnyvx6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 15:35:47 -0200, Yuan HOng <hongyuan1306 at gmail.com>  
escribi?:

> In my project I have several date related methods which I want tested for
> correctness. The functions use date.today() in several places. Since this
> could change every time I run the test, I hope to find someway to fake a
> date.today.
>
> For illustration lets say I have a function:
>
>
> from datetime import date
> def today_is_2009():
>     return date.today().year == 2009
>
> To test this I would like to write test function like:
>
> def test_today_is_2009():
>     set_today(date(2008, 12, 31))
>     assert today_is_2009() == False
>     set_today(date(2009,1,1))
>     assert today_is_2009() == True
>

Instead of trying to inject a fake date, you could rewrite the function to
take a date argument:

def today_is_2009(today=None):
    if today is None:
      today = date.today()
    return today.year == 2009

Then, tests should pass a known date. This approach has a drawback -- you
don't test the case when no argument is given.

Another way is to use a fake date class, or a fake datetime module. Google  
"python mock object"

-- 
Gabriel Genellina



From rdmurray at bitdance.com  Sat Feb 28 15:46:42 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:46:42 +0000 (UTC)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
	<c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>
Message-ID: <goc7rh$kt3$1@ger.gmane.org>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
> > zaheer.ag... at gmail.com wrote:
> > > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > > wrote:
> > >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi=
> =F3:
> >
> > >>> I want to create zip file equivalent to java jar file,I created a zip
> > >>> file of my sources and added some __main__.py
> > >>> it says __Main__.py not found in Copyproject.zip..?
> > >> __main__.py must exist in the root directory.
> >
> > >> --
> > >> Gabriel Genellina
> >
> > > What do you mean by root directory..?What is this directory in
> > > Windows..?You mean the top level folder of the project?in my case
> > > copyproject folder..?
> >
> > root directory is the topmost directory (imagine a tree, the root is
> > where all the branches branched from), in this case the root directory
> > is your copyproject main folder.
> 
> 
> I wonder, I do have the __main__.py  in the root directory,but still getting
> python.exe cannot find __main__.py in CopyProject.zip
> 
> I used the following command
> python Copyproject.zip -m __main__.py --uploadFile and also tried with
> python Copyproject.zip --uploadFile
> both give me the same error , I can see the sys.path contains the
> project folder.

How did you create the zip?  The __main__.py file has to be at the
_top level_ of the zip file.  In other words:

    zip test.zip __main.py othermodule.py somedir

works but

    zip test.zip myproject

does not.

--RDM



From Scott.Daniels at Acm.Org  Sat Feb 28 16:01:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 28 Feb 2009 13:01:32 -0800
Subject: How best to test functions which use date.today
In-Reply-To: <mailman.939.1235843710.11746.python-list@python.org>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<mailman.939.1235843710.11746.python-list@python.org>
Message-ID: <dvKdna3AapwWODTUnZ2dnUVZ_qXinZ2d@pdx.net>

Lie Ryan wrote:
> Yuan HOng wrote:
>> In my project I have several date related methods which I want tested for
>> correctness. The functions use date.today() in several places. Since this
>> could change every time I run the test, I hope to find someway to fake a
>> date.today.
>> For illustration lets say I have a function:
>>
>> from datetime import date
>> def today_is_2009():
>>     return date.today().year == 2009
>>
>> To test this I would like to write test function like:
>>
>> def test_today_is_2009():
>>     set_today(date(2008, 12, 31))
>>     assert today_is_2009() == False
>>     set_today(date(2009,1,1))
>>     assert today_is_2009() == True
Try something like this:
     import module_to_test as sut # "sut" -> system under test
     from datetime import date

     class FakeDate(object):
         def __init__(self, value):
             self._result = value
         def today(self):
             return self._result

     def test_today_is_2009_too_old():
         temp, sut.date = sut.date, FakeDate(date(2008, 12, 31))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp

     def test_today_is_2009_too_young():
         temp, sut.date = sut.date, FakeDate(date(2010, 1, 1))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp

     def test_today_is_2009_just_right():
         temp, sut.date = sut.date, FakeDate(date(2009, 1, 1))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp


Note: each test should test 1 thing.

--Scott David Daniels
Scott.Daniels at Acm.Org


From andymac at bullseye.apana.org.au  Sat Feb 28 17:45:41 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Sun, 01 Mar 2009 09:45:41 +1100
Subject: Static Map
In-Reply-To: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>
References: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>
Message-ID: <49A9BE95.8070903@bullseye.andymac.org>

KMCB wrote:
> Hello,
> 
> I'm interested in creating a static map of a region in the US.  This
> map would be set into a picture format, so I can add it to a
> document.  I would like it to contain some town names and road
> information.  Then I would like to add points, based on LAT and LONG,
> that can be labeled with information I provide.
> 
> I have done some searching, Google Maps probably will not work because
> of the License.  WuGeo does not seam to have the details.  I was
> considering tw.openlayers, but do not know if that is the best
> starting point.  If I could not create the picture from Python, would
> use tw and then create a screen shot to get started.
> 
> Does anyone have thoughts on a better approach?

While web-centric, you might find
http://www.alistapart.com/articles/takecontrolofyourmaps
an interesting read.

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From cosmo_general at yahoo.com  Sat Feb 28 18:01:56 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Sat, 28 Feb 2009 15:01:56 -0800 (PST)
Subject: Bug report: ClientForm
Message-ID: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>

Hi Folks,

As directed, I got ClientForm and played with it. It is cool! However,
I also found a bug:

When it parses a form, if the VALUE of a field has not space, it works
very well. For example, if a dropdown list, there many options, such
as:

<option value=foo> ....

the value foo will be picked up for sure. But, if there is a space:

<option value=foo bar> .....

The *bar* will be missed out. I wish this bug can be fixed in near
future.

By the way, can somebody helps me on setting parameter of uploading a
file. In ClientForm, if I need to upload a text file, I can do it by:

form.add_file(..., "text/plain")

What about a picture file? What is the counterpart of 'text/plain"?
Thanks!

Muddy Coder


From google at mrabarnett.plus.com  Sat Feb 28 18:42:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 28 Feb 2009 23:42:10 +0000
Subject: Bug report: ClientForm
In-Reply-To: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
Message-ID: <49A9CBD2.9020301@mrabarnett.plus.com>

Muddy Coder wrote:
> Hi Folks,
> 
> As directed, I got ClientForm and played with it. It is cool! However,
> I also found a bug:
> 
> When it parses a form, if the VALUE of a field has not space, it works
> very well. For example, if a dropdown list, there many options, such
> as:
> 
> <option value=foo> ....
> 
> the value foo will be picked up for sure. But, if there is a space:
> 
> <option value=foo bar> .....
> 
Values should be quoted, although you can omit the quotes if there
aren't any spaces in the string:

     <option value="foo bar">

You can see examples at http://wwwsearch.sourceforge.net/ClientForm/

     <input type="checkbox" name="control2" value="foo" id="cbe1">

As you can see, whitespace separates the name=value pairs.

> The *bar* will be missed out. I wish this bug can be fixed in near
> future.
> 
It's not a bug.


From gagsl-py2 at yahoo.com.ar  Sat Feb 28 18:53:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 21:53:21 -0200
Subject: Bug report: ClientForm
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
Message-ID: <op.up25y7fex6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 21:01:56 -0200, Muddy Coder <cosmo_general at yahoo.com>  
escribi?:

> By the way, can somebody helps me on setting parameter of uploading a
> file. In ClientForm, if I need to upload a text file, I can do it by:
>
> form.add_file(..., "text/plain")
>
> What about a picture file? What is the counterpart of 'text/plain"?

See http://www.iana.org/assignments/media-types/image/

-- 
Gabriel Genellina



From cjw at ncf.ca  Sat Feb 28 19:21:09 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sat, 28 Feb 2009 19:21:09 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <01b95b4d$0$20667$c3e8da3@news.astraweb.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
	<01b95b4d$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <49A9D4F5.8040804@ncf.ca>

Steven D'Aprano wrote:
> Colin J. Williams wrote:
> 
>> Sometimes, it's useful to be able to
>> obtain the data in the sorted sequence.
>>
>> You might consider adding functionality
>> like:
>>
>> def seqItems(self):
>> '''To return the items, sorted
>> by key. '''
>> return [self[k] for k in
>> self.seqKeys()]
> 
> Amazingly, the Python time-machine provides such functionality! Using just a
> handful of pre-existing pieces, you can do this:
> 
> sorted(mydict.items())
> sorted(mydict.keys())
> [mydict[x] for x in sorted(mydict.keys)]
> 
> and any other sequence you might need. That's the beauty of a general
> purpose programming language. You don't need everything to be a built-in
> *wink*
> 
> 
Thanks, you are right, you have a neat 
way of handling the first two, they
work with an instance of Raymond 
Hettinger's. OrderedDict.

The third suggestion has a couple of 
problems, which are fixed below.

if __name__ == '__main__':
     d= 
OrderedDict.fromkeys('abracadabra', 
value= 'zzz')
     print(d)
     print(d.seqKeys())
     print(d.seqItems())
     print(d.seqValues())
     # Steven D'Aprano's alternative
     mydict= d.copy()
     print sorted(mydict.items())
     print sorted(mydict.keys())
     # print [mydict[x] for x in 
sorted(mydict.keys)] Instance object is 
not iterable
     print(sorted(iter([(x[1], x[0]) for 
x in mydict.iteritems()]))) # This works

Colin W.


From http  Sat Feb 28 19:43:37 2009
From: http (Paul Rubin)
Date: 28 Feb 2009 16:43:37 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
	<01b95b4d$0$20667$c3e8da3@news.astraweb.com>
	<49A9D4F5.8040804@ncf.ca>
Message-ID: <7x1vtihy2u.fsf@ruckus.brouhaha.com>

"Colin J. Williams" <cjw at ncf.ca> writes:
>      # print [mydict[x] for x in sorted(mydict.keys)] Instance object
> is not iterable

It was a typo.  Use:

    print [mydict[x] for x in sorted(mydict.keys())]


From lie.1296 at gmail.com  Sat Feb 28 20:26:32 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:26:32 +1100
Subject: Bug report: ClientForm
In-Reply-To: <49A9CBD2.9020301@mrabarnett.plus.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
	<49A9CBD2.9020301@mrabarnett.plus.com>
Message-ID: <49A9E448.4050209@gmail.com>

MRAB wrote:
> Muddy Coder wrote:
>> Hi Folks,
>>
>> When it parses a form, if the VALUE of a field has not space, it works
>> very well. For example, if a dropdown list, there many options, such
>> as:
>>
>> <option value=foo> ....
>>
>> the value foo will be picked up for sure. But, if there is a space:
>>
>> <option value=foo bar> .....
>>
> Values should be quoted, although you can omit the quotes if there
> aren't any spaces in the string:
> 
>     <option value="foo bar">
> 
> You can see examples at http://wwwsearch.sourceforge.net/ClientForm/
> 
>     <input type="checkbox" name="control2" value="foo" id="cbe1">
> 
> As you can see, whitespace separates the name=value pairs.

It is also a good habit to have the quotes even when you don't use
spaces. Also, knowledge of xHTML in general should come in handy.


From lie.1296 at gmail.com  Sat Feb 28 20:26:32 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:26:32 +1100
Subject: Bug report: ClientForm
In-Reply-To: <49A9CBD2.9020301@mrabarnett.plus.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
	<49A9CBD2.9020301@mrabarnett.plus.com>
Message-ID: <49A9E448.4050209@gmail.com>

MRAB wrote:
> Muddy Coder wrote:
>> Hi Folks,
>>
>> When it parses a form, if the VALUE of a field has not space, it works
>> very well. For example, if a dropdown list, there many options, such
>> as:
>>
>> <option value=foo> ....
>>
>> the value foo will be picked up for sure. But, if there is a space:
>>
>> <option value=foo bar> .....
>>
> Values should be quoted, although you can omit the quotes if there
> aren't any spaces in the string:
> 
>     <option value="foo bar">
> 
> You can see examples at http://wwwsearch.sourceforge.net/ClientForm/
> 
>     <input type="checkbox" name="control2" value="foo" id="cbe1">
> 
> As you can see, whitespace separates the name=value pairs.

It is also a good habit to have the quotes even when you don't use
spaces. Also, knowledge of xHTML in general should come in handy.



From lie.1296 at gmail.com  Sat Feb 28 20:35:07 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:35:07 +1100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A9E64B.60408@gmail.com>

Christian R. wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

Next time you talk to him, when he say that again, interrupt him, and
say: "[citation needed]" (don't forget the parentheses).

I don't really see any reason why "python modules would cause problem
for updating customer's installations", and I can't find anything on
Google that mentioned any problem. However, I do know that upgrading
python modules is easier than upgrading most other language's
libraries[citation needed].


From lie.1296 at gmail.com  Sat Feb 28 20:35:07 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:35:07 +1100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A9E64B.60408@gmail.com>

Christian R. wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

Next time you talk to him, when he say that again, interrupt him, and
say: "[citation needed]" (don't forget the parentheses).

I don't really see any reason why "python modules would cause problem
for updating customer's installations", and I can't find anything on
Google that mentioned any problem. However, I do know that upgrading
python modules is easier than upgrading most other language's
libraries[citation needed].



From seaworthyjeremy at gmail.com  Sat Feb 28 20:50:35 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sat, 28 Feb 2009 17:50:35 -0800 (PST)
Subject: Email Program
Message-ID: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>

Is it possible to make a GUI email program in Python that stores
emails, composes, ect?


From seaworthyjeremy at gmail.com  Sat Feb 28 20:56:40 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sat, 28 Feb 2009 17:56:40 -0800 (PST)
Subject: Email Program
Message-ID: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>

Is it possible to make a GUI email program in Python that stores
emails, composes, ect? Also, could I create my own programming
language in Python? What are Pythons limits, or is this just a waste
of my time to learn it.


From google at mrabarnett.plus.com  Sat Feb 28 20:59:33 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 01 Mar 2009 01:59:33 +0000
Subject: Email Program
In-Reply-To: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>
References: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>
Message-ID: <49A9EC05.3000009@mrabarnett.plus.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect?
> 
Yes.


From traef at ebasedsecurity.com  Sat Feb 28 21:03:55 2009
From: traef at ebasedsecurity.com (Thomas Raef)
Date: Sat, 28 Feb 2009 20:03:55 -0600
Subject: Email Program
Message-ID: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>

What a great response.

> -----Original Message-----
> From: python-list-bounces+traef=ebasedsecurity.com at python.org
> [mailto:python-list-bounces+traef=ebasedsecurity.com at python.org] On
> Behalf Of MRAB
> Sent: Saturday, February 28, 2009 8:00 PM
> To: python-list at python.org
> Subject: Re: Email Program
> 
> J wrote:
> > Is it possible to make a GUI email program in Python that stores
> > emails, composes, ect?
> >
> Yes.
> --
> http://mail.python.org/mailman/listinfo/python-list


From lists at cheimes.de  Sat Feb 28 21:23:48 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 01 Mar 2009 03:23:48 +0100
Subject: Email Program
In-Reply-To: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>
References: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>
Message-ID: <gocrjk$b1$1@ger.gmane.org>

Thomas Raef wrote:
> What a great response.

It's a correct, straight forward and short answer to the op's question.

Christian



From lie.1296 at gmail.com  Sat Feb 28 21:24:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 13:24:57 +1100
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9F1F9.8090700@gmail.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

Python is Turing Complete.


From lie.1296 at gmail.com  Sat Feb 28 21:24:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 13:24:57 +1100
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9F1F9.8090700@gmail.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

Python is Turing Complete.



From timr at probo.com  Sat Feb 28 21:41:10 2009
From: timr at probo.com (Tim Roberts)
Date: Sat, 28 Feb 2009 18:41:10 -0800
Subject: why cannot assign to function call
References: <2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>	<01771716$0$8693$c3e8da3@news.astraweb.com>	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>	<0178651d$0$8693$c3e8da3@news.astraweb.com>	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
Message-ID: <d4tjq4l296s96rm1k9i7o5pg15m9n5mkdi@4ax.com>

Ethan Furman <ethan at stoneleaf.us> wrote:
>
>Specifically, how is a new name (pbr) different, in Python, from a new 
>name initialized as if by assignment (pbv)?  It seems to me than you end 
>up with the same thing in either case (in Python, at least), making the 
>distinction non-existent.
>
>def func(bar):
>     bar.pop()
>
>Pass-by-reference:
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo

The problem here, in my view, is the terminology.  It is true that, inside
the function "func", "bar" will refer to the same list that "foo" refers
to.  However, it is inaccurate to think of this list as "foo".  There
exists a list -- an anonymous list in object space -- and while "func" is
executing, there are two names bound to that list.  So, the "bar.pop()"
instruction changes that anonymous list, you'll see those changes if you
inspect "foo" after the call.

>Pass-by-value:
>   foo = ['Python','Rocks!']
>   func(foo)			# bar is new name for foo
>				# is this any different from above?

Yes, it's different.  If Python really had "pass by value", that function
call would pass a COPY of the list.  The function would receive the list's
"value", not the list itself.

>If I have this right, in both cases foo will be reduced to a single-item 
>list after func.  Any further explanation you care to provide will be 
>greatly appreciated!

Nope.  Under pass-by-value semantics, "func" could dance on the list to its
heart's content, and "foo" would not be changed.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From sgeiger at councilforeconed.org  Sat Feb 28 22:02:38 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Sat, 28 Feb 2009 22:02:38 -0500
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9FACE.9080602@councilforeconed.org>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
>   

Python is "Turing complete," which means it is a general-purpose 
programming language.  Generally speaking, this means you can do 
anything with it that you can do with any other programming language.  
Being a higher-level language, Python is often chosen over other 
languages because it is faster to do many things in Python.

You could also create another programming language with Python.  In 
fact, another general-purpose programming language (C) was used to 
create Python.

Python makes many things easy.  For many tasks, Python saves you a lot 
of time.  It is a good general-purpose tool to know how to use well.  It 
is a good beginner's language, as it makes many of the annoying things 
about programs non-issues.



-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From sgeiger at councilforeconed.org  Sat Feb 28 22:10:29 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Sat, 28 Feb 2009 22:10:29 -0500
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <49A9E64B.60408@gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
	<49A9E64B.60408@gmail.com>
Message-ID: <49A9FCA5.7020000@councilforeconed.org>


>> The company does use Python on rare occasions. It all comes down to
>> the prejudices and habits of one of the programmers. His only argument
>> I can't counter -because I don't see the problem- is that "Python
>> modules cause problems for updates to customer's installations".
>>     

This is purely an argument from ignorance, a logical fallacy. 

Python is one of the more flexible, cleanly designed tools you could 
have at your disposal--it is certainly more powerful, flexible and 
elegant than VBScript.  If he has any doubts about how things can be 
designed with Python, show him that py2web (a web server/development 
environment) requires no installation, can run on a USB memory stick, 
can work with multiple operating systems, and can run on a cell phone 
(see youtube demo). 



> Next time you talk to him, when he say that again, interrupt him, and
> say: "[citation needed]" (don't forget the parentheses).
>
> I don't really see any reason why "python modules would cause problem
> for updating customer's installations", and I can't find anything on
> Google that mentioned any problem. However, I do know that upgrading
> python modules is easier than upgrading most other language's
> libraries[citation needed].
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From perfreem at gmail.com  Sat Feb 28 22:30:04 2009
From: perfreem at gmail.com (per)
Date: Sat, 28 Feb 2009 19:30:04 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
Message-ID: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>

hi all,

i recently installed a new version of a package using python setup.py
install --prefix=/my/homedir on a system where i don't have root
access. the old package still resides in /usr/lib/python2.5/site-
packages/ and i cannot erase it.

i set my python path as follows in ~/.cshrc

setenv PYTHONPATH /path/to/newpackage

but whenever i go to python and import the module, the version in site-
packages is loaded. how can i override this setting and make it so
python loads the version of the package that's in my home dir?

 thanks.




From pavlovevidence at gmail.com  Sat Feb 28 23:09:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 28 Feb 2009 20:09:03 -0800 (PST)
Subject: OTish: convince the team to drop VBScript
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com> 
	<49A9E64B.60408@gmail.com>
	<mailman.972.1235877082.11746.python-list@python.org>
Message-ID: <13188e5f-a5d5-4235-ac51-82a407e4a7db@w24g2000prd.googlegroups.com>

On Feb 28, 7:10?pm, Shane Geiger <sgei... at councilforeconed.org> wrote:
> >> The company does use Python on rare occasions. It all comes down to
> >> the prejudices and habits of one of the programmers. His only argument
> >> I can't counter -because I don't see the problem- is that "Python
> >> modules cause problems for updates to customer's installations".
>
> This is purely an argument from ignorance, a logical fallacy.

I don't think it's an argument at all.  The guy probably had something
more specific in mind but didn't express himself well, and it might
have even been a real issue.  Python is not, unfortunately, the
easiest language to deploy applications in.

I don't think there is any deployment difficulty so great that I would
ever chose VBscript, but opinions might differ.


Carl Banks


From michele.simionato at gmail.com  Sat Feb 28 23:16:47 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 28 Feb 2009 20:16:47 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com> 
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com> 
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com> 
	<49A95F12.3010906@ncf.ca> <01b95b4d$0$20667$c3e8da3@news.astraweb.com> 
	<49A9D4F5.8040804@ncf.ca> <7x1vtihy2u.fsf@ruckus.brouhaha.com>
Message-ID: <47701903-057e-4dd8-bd96-86afbe551f5b@w9g2000yqa.googlegroups.com>

On Mar 1, 1:43?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> "Colin J. Williams" <c... at ncf.ca> writes:
>
> > ? ? ?# print [mydict[x] for x in sorted(mydict.keys)] Instance object
> > is not iterable
>
> It was a typo. ?Use:
>
> ? ? print [mydict[x] for x in sorted(mydict.keys())]

Even better

print [mydict[x] for x in sorted(mydict)]


From pavlovevidence at gmail.com  Sat Feb 28 23:24:17 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 28 Feb 2009 20:24:17 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
References: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>
Message-ID: <5c5b74e8-c459-4019-9140-e92fb3e06da4@k29g2000prf.googlegroups.com>

On Feb 28, 7:30?pm, per <perfr... at gmail.com> wrote:
> hi all,
>
> i recently installed a new version of a package using python setup.py
> install --prefix=/my/homedir on a system where i don't have root
> access. the old package still resides in /usr/lib/python2.5/site-
> packages/ and i cannot erase it.
>
> i set my python path as follows in ~/.cshrc
>
> setenv PYTHONPATH /path/to/newpackage
>
> but whenever i go to python and import the module, the version in site-
> packages is loaded. how can i override this setting and make it so
> python loads the version of the package that's in my home dir?


What happens when you run the command "print sys.path" from the Python
prompt?  /path/to/newpackage should be the second item, and shoud be
listed in front of the site-packages dir.

What happens when you run "print os.eviron['PYTHONPATH']" at the
Python interpreter?  It's possible that the sysadmin installed a
script that removes PYTHONPATH environment variable before invoking
Python.  What happens when you type "which python" at the csh prompt?

What happens when you type "ls /path/to/newpackage" at your csh
prompt?  Is the module you're trying to import there?

You approach should work.  These are just suggestions on how to
diagnose the problem; we can't really help you figure out what's wrong
without more information.


Carl Banks


From perfreem at gmail.com  Sat Feb 28 23:53:45 2009
From: perfreem at gmail.com (per)
Date: Sat, 28 Feb 2009 20:53:45 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
References: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>
	<5c5b74e8-c459-4019-9140-e92fb3e06da4@k29g2000prf.googlegroups.com>
Message-ID: <11876bd1-b671-4218-b4bb-d15fb1822cb6@h5g2000yqh.googlegroups.com>

On Feb 28, 11:24?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 28, 7:30?pm, per <perfr... at gmail.com> wrote:
>
> > hi all,
>
> > i recently installed a new version of a package using python setup.py
> > install --prefix=/my/homedir on a system where i don't have root
> > access. the old package still resides in /usr/lib/python2.5/site-
> > packages/ and i cannot erase it.
>
> > i set my python path as follows in ~/.cshrc
>
> > setenv PYTHONPATH /path/to/newpackage
>
> > but whenever i go to python and import the module, the version in site-
> > packages is loaded. how can i override this setting and make it so
> > python loads the version of the package that's in my home dir?
>
> What happens when you run the command "print sys.path" from the Python
> prompt? ?/path/to/newpackage should be the second item, and shoud be
> listed in front of the site-packages dir.
>
> What happens when you run "print os.eviron['PYTHONPATH']" at the
> Python interpreter? ?It's possible that the sysadmin installed a
> script that removes PYTHONPATH environment variable before invoking
> Python. ?What happens when you type "which python" at the csh prompt?
>
> What happens when you type "ls /path/to/newpackage" at your csh
> prompt? ?Is the module you're trying to import there?
>
> You approach should work. ?These are just suggestions on how to
> diagnose the problem; we can't really help you figure out what's wrong
> without more information.
>
> Carl Banks

hi,

i am setting it programmatically now, using:

import sys
sys.path = [....]

sys.path now looks exactly like what it looked like before, except the
second element is my directory. yet when i do

import mymodule
print mymodule.__version__

i still get the old version...

any other ideas?


From t.roberts at cqu.edu.au  Sun Feb  1 00:36:43 2009
From: t.roberts at cqu.edu.au (Tim Roberts)
Date: Sun, 1 Feb 2009 15:36:43 +1000
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
Message-ID: <1AE19A80523D5F40BE0044A1447A53FF0ADB9733@UNIMAIL.staff.ad.cqu.edu.au>

Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not.  At the moment, because of accuracy concerns, I'm doing something like
 
                    for root in powersp:
                            nroot = round(bignum**(1.0/root))
                            if bignum==long(nroot)**root:
                                                             .........
which is probably very inefficient, but I can't see anything better.....
 
Tim
 
 


From steve at savechicago.org  Sun Feb  1 00:40:52 2009
From: steve at savechicago.org (steve at savechicago.org)
Date: Sat, 31 Jan 2009 21:40:52 -0800 (PST)
Subject: Please help to play 5 jpegs as a slideshow in JES(Jython) --- 
	BEGINNER.
Message-ID: <28dec764-64e4-4a47-87d5-ba3b52e3b051@r36g2000prf.googlegroups.com>

Hello, I am a brand brand new programming student in Jython and I have
been working on a simple homework assignment in JES for the last 12
hours and am completely lost.

Basically, we have to make a jpeg slideshow with 5 different pictures
with audio background that lasts 60 seconds. I have absolutely no idea
where to begin and am more lost than I was 12 hours ago.



def pickAndShow():

myfile = pickAFile()
mypicture = makePicture(myfile)
show(mypicture)

I know this is how to call up a picture from your hard drive. That?s
about all I know. I have no idea how to call up 5 of them, one at a
time, and with audio in the background. And how to make this happen
with a command. Can someone help me?


From dchandran1 at tinkercell.com  Sun Feb  1 00:47:27 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Sat, 31 Jan 2009 21:47:27 -0800
Subject: Embedding numpy works once, but not twice??
Message-ID: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>

I have a program in which I have successfully embedded Python. Now, I want
to include NumPy as well (and other modules). I am able to import numpy
once. Then I close the python console in my program and then re-open it.
When I try to import numpy for a second time, the program crashes. Below is
a simple version of the problem.

The main() import numpy twice. The first import works fine -- prints "no
errors.". But the second load crashes the program. What is going on here?

By the way, this is all in Windows (XP and Vista have same problem) using
python25.dll (since numpy does not work for python26.dll). I am using MinGW
compiler.

#include <stdlib.h>
#include <stdio.h>
#include <Python.h>

int load(char * code)
{
PyObject *errobj, *errdata, *errtraceback, *pystring;
int retval;

       Py_Initialize();

PyObject *main = PyImport_AddModule("__main__");
PyObject* main_dict = PyModule_GetDict( main );

PyObject * rstring = PyRun_String( code, Py_file_input, main_dict, main_dict
); //the second main_dict was my_program_dict originally
 PyErr_Fetch (&errobj, &errdata, &errtraceback);
 if (errdata != NULL)
{
PyObject *s = PyObject_Str(errdata);
char * c = PyString_AS_STRING(s);
printf("%s\n",c);                   //print any errors
Py_DECREF(s);
}
else
{
printf("no errors.\n");
 }
 Py_XDECREF(errobj);
Py_XDECREF(errdata);
Py_XDECREF(errtraceback);

    Py_Finalize();
    return 0;
}

int main()
{
load("import numpy\n");
load("import numpy\n");
}

//output is:
// no errors
// <CRASH>
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From http  Sun Feb  1 00:53:23 2009
From: http (Paul Rubin)
Date: 31 Jan 2009 21:53:23 -0800
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <7x4ozen1nw.fsf@ruckus.brouhaha.com>

"Tim Roberts" <t.roberts at cqu.edu.au> writes:
> Actually, all I'm interested in is whether the 100 digit numbers
> have an exact integral root, or not.  At the moment, because of
> accuracy concerns, I'm doing something like
>  
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

First of all, convert the bignum to a float outside of the loop.  Second, precompute
the inverses 1.0/2.0, 1.0/3.0, ....  Third, do the exponentiation and comparison only
if the float equivalent is very close.  I bet almost all the time you're spending is
in bignum to float conversion.

The article

     Daniel J. Bernstein (1998). "Detecting perfect powers in essentially
     linear time". Mathematics of Computation 67 (223): 1253-1283
     (http://cr.yp.to/papers/powers-ams.pdf)

may be of interest.


From sjmachin at lexicon.net  Sun Feb  1 01:14:38 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 31 Jan 2009 22:14:38 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
Message-ID: <6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>

On Feb 1, 3:39?pm, Shawn Milochik <Sh... at Milochik.com> wrote:

> Not to discourage the use of Python, but it seems that fgrep with the
> -f flag already does exactly what you want. If you're on Windows, you
> can get the Windows version of fgrep here: http://unxutils.sourceforge.net/

That URL is antique and a dead end. When you find the actual
sourceforge project page (http://sourceforge.net/projects/unxutils/)
and browse the forums and the CVS repository, you'll see tumbleweed
blowing down Main Street and not much else (besides a few whinges
about that dead end URL, and many unanswered issues).

Alternative: http://gnuwin32.sourceforge.net/


From http  Sun Feb  1 01:17:07 2009
From: http (Paul Rubin)
Date: 31 Jan 2009 22:17:07 -0800
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <7xk58a7kbg.fsf@ruckus.brouhaha.com>

"Tim Roberts" <t.roberts at cqu.edu.au> writes:
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

Actually that will not be accurate enough to know if bignum is, say, a perfect square.
You will have to do the small-power tests at full precision (or use a fancy algorithm).
Larger powers can be done with floats.


From t.roberts at cqu.edu.au  Sun Feb  1 01:17:53 2009
From: t.roberts at cqu.edu.au (Tim Roberts)
Date: Sun, 1 Feb 2009 16:17:53 +1000
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org><1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au><mailman.8504.1233466604.3487.python-list@python.org>
	<7x4ozen1nw.fsf@ruckus.brouhaha.com>
Message-ID: <1AE19A80523D5F40BE0044A1447A53FF0ADB9737@UNIMAIL.staff.ad.cqu.edu.au>

Paul,
 
Yes, very good, on all counts.  Many thanks.
 
Tim
 

________________________________

From: Paul Rubin [mailto:"http://phr.cx"@NOSPAM.invalid]
Sent: Sun 01-Feb-09 3:53 PM
To: python-list at python.org
Subject: Re: nth root



"Tim Roberts" <t.roberts at cqu.edu.au> writes:
> Actually, all I'm interested in is whether the 100 digit numbers
> have an exact integral root, or not.  At the moment, because of
> accuracy concerns, I'm doing something like
> 
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

First of all, convert the bignum to a float outside of the loop.  Second, precompute
the inverses 1.0/2.0, 1.0/3.0, ....  Third, do the exponentiation and comparison only
if the float equivalent is very close.  I bet almost all the time you're spending is
in bignum to float conversion.

The article

     Daniel J. Bernstein (1998). "Detecting perfect powers in essentially
     linear time". Mathematics of Computation 67 (223): 1253-1283
     (http://cr.yp.to/papers/powers-ams.pdf)

may be of interest.
--
http://mail.python.org/mailman/listinfo/python-list




From cournape at gmail.com  Sun Feb  1 01:27:18 2009
From: cournape at gmail.com (David Cournapeau)
Date: Sun, 1 Feb 2009 15:27:18 +0900
Subject: Embedding numpy works once, but not twice??
In-Reply-To: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
Message-ID: <5b8d13220901312227i1db85215wf3d544622beeaa2e@mail.gmail.com>

On Sun, Feb 1, 2009 at 2:47 PM, Deepak Chandran
<dchandran1 at tinkercell.com> wrote:
> I have a program in which I have successfully embedded Python. Now, I want
> to include NumPy as well (and other modules). I am able to import numpy
> once. Then I close the python console in my program and then re-open it.
> When I try to import numpy for a second time, the program crashes. Below is
> a simple version of the problem.
> The main() import numpy twice. The first import works fine -- prints "no
> errors.". But the second load crashes the program. What is going on here?
>
> By the way, this is all in Windows (XP and Vista have same problem) using
> python25.dll (since numpy does not work for python26.dll). I am using MinGW
> compiler.

FYI, numpy can work with python 2.6 if you build from recent svn.
numpy 1.3.0 will have 2.6 binaries

I can't really help you for your problem, I am not familiar with
python embedding. But inside python, when doing a double import,
doesn't python check against double import (e.g. the second time, it
does almost nothing) ? Is this specific to numpy, or other python
modules do that as well ?

cheers,

David


From aleksandr.goretoy at gmail.com  Sun Feb  1 02:08:26 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Sun, 1 Feb 2009 01:08:26 -0600
Subject: PyNutButter BETA 1.0.0 - Automates CSV data Importation into any 
	website http/https and/or mysql database
Message-ID: <fa98a9e30901312308neac3fd0jfdb94e708d4ea63d@mail.gmail.com>

Introducing PynutButter BETA 1.0.0

Automates csv data importation into any website. Or your money back.
Programs like this idea of a program I have here cost $2500. Pynutbutter is
opensource. You can use the code anyway you want. As long as I get my credit
where it is due. I've worked on this project for roughly 1.5 years now. This
is an idea I tried in 2 languages. PHP and python, now.

No matter how much data in your csv file.
No matter what the field names are.
No matter how data is formatted

With PyNutButter you  can parse this data in custom functions and then send
it to its destinations.
You can map all the csv file headers to fields of a html page.
It loops for each line in the csv file and imports your data.

You must configure your configuration and create custom functions that you
can call from this configuration.

I've uploaded all the main files, except my configuration(I am working on
examples and making the main project page better)

You can find this project here:

http://code.google.com/p/pynutbutter/



I've worked long and hard on this application and the idea behind it. Any
help making this tool better would be greatly appreaciated.

Please let me know what you this of this tool. Any ideas/features are also
always welcome.

I also have a presentation I am working on for this tool. I hope to find a
nice job. This tools is very powerfuls. I was think next to try it with
scapy. That would be sweet. You can add custom flavors(data parsing/sending
libraries). My goal for this tool was to make everything as dynamic as
possible. calling of functions and dealing with parsed data in functions.
Only reason why I built is because I needed a tool like this. I know someone
else woulnd't mind having a tool like this either, so here you go. If you
can please donate or something somehow.

Upcoming Features:
use of parsed data from more than one file at a time.
pyGTK for ease of configuration creation(any help?)
gui creation of custom functions
automatic form parsing based on given urls in config

-Alex Goretoy
http://www.alexgoretoy.com
somebodywhocarez at gmail.com
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From rt8396 at gmail.com  Sun Feb  1 02:10:39 2009
From: rt8396 at gmail.com (r)
Date: Sat, 31 Jan 2009 23:10:39 -0800 (PST)
Subject: Embedding numpy works once, but not twice??
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com> 
	<mailman.8507.1233469645.3487.python-list@python.org>
Message-ID: <31b8b23d-ee9d-4da1-9961-b02c6221e089@p37g2000yqd.googlegroups.com>

> Embedding numpy works once, but not twice??

That's what she said!


From gandalf at shopzeus.com  Sun Feb  1 02:37:13 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Sun, 01 Feb 2009 08:37:13 +0100
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <004e01c98095$f90f9440$0d00a8c0@hendrik>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<004e01c98095$f90f9440$0d00a8c0@hendrik>
Message-ID: <49855129.9070901@shopzeus.com>


> 8<------------------------------
>
>   
>> .......  Setting the
>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>> though).
>>     
>
> Why not?  I have been merrily setting it, and I have not noticed anything weird.
> (yet)
>   
Please see my original post. I specifically stated that I do not want to 
use setsockopt and be able to listen on the same port from many 
processes. I knew that I could use SO_REUSEADDR, but I'm heistating to 
do so. I must guarantee that only one process listens on a given port at 
the same time.

Maybe I could use some kind of locking, but it would be too difficult:

- mutexes are great but they are platform dependent and they are not in 
the standard lib
- the listening processes do not see each other's home directory so file 
locking cannot be used for this
- these processes will probably listen on many ports at the same time, 
it is also a problem with mutexes/file locks (who wants 50 lock files to 
be created?)


 Best,

   Laszlo




From mcheung63 at hotmail.com  Sun Feb  1 02:42:42 2009
From: mcheung63 at hotmail.com (mcheung63 at hotmail.com)
Date: Sat, 31 Jan 2009 23:42:42 -0800 (PST)
Subject: what IDE is the best to write python?
Message-ID: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>

Hi all
   what IDE is the best to write python?
thanks
from Peter (mcheung63 at hotmail.com)


From bj_666 at gmx.net  Sun Feb  1 02:50:38 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 1 Feb 2009 07:50:38 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
Message-ID: <6ul2ieFg1sraU1@mid.uni-berlin.de>

On Sat, 31 Jan 2009 15:28:14 -0800, thmpsn.m.k wrote:

> On Jan 31, 2:27?pm, Christian Heimes <li... at cheimes.de> wrote:
>> Do you honestly believe that C++'s private members are really private?
>> Privateness is only enforced during parsing time. Nobody can stop you
>> from messing around with header files or memory. You can still access
>> and modify private members but it's all messy and ugly. Even C# and
>> .NET don't stop you from doing nasty things from unmananged assemblies.
> 
> I don't know how you would do it in C# (or Java for that matter).

In Java you can use reflection to get your fingers on private fields.

> In C++ you can play with pointers to "get at" some memory location
> somewhere in the object.
> [Snipped pointer fiddling explanation]
> So: Sometimes it may work, usually it will be unsafe and/or non-
> portable, and in most cases the procedure will look complicated.

Or ``#define private public`` before including the header files.  Which 
doesn't look complicated to me.

> It certainly isn't something I'd try in a real application. However, it
> WOULD be tempting to access the member if the language allows me to just
> write:
> 
> print "obj.b =", obj.b
> 
> and be done with it.

And that's perfectly okay, because the author would have prepended an 
underscore to `b` if you should not mess with it.

> Personally, in Python, I use double underscores for "private" members,
> so the above would look like:
> 
> print "obj.b =", obj._NonPOD__b
> 
> but it's still easier than the C++ example.

The name mangling is there to prevent name clashes, not to make 
attributes inaccessible.  It's useful for mixin classes for example.

>> Seriously, 'private' and 'protected' are merely tools to stop bad
>> programmers from doing bad stuff. And the serve as documentation, too.
> 
> It's not just documentation. For example, suppose you're reading a class
> definition and see the declaration of a veryInterestingMember and forget
> that you're not supposed to access it. If you try to access it, the
> compiler will give you a diagnostic message at compile time.

I can't forget that because if I'm not supposed to access it, its name 
would be `_very_interesting_member`.  I don't have to wait till compile 
time to see that, it is really obvious at the time I write the code to 
access it, or decide not to because it is not part of the API.

Ciao,
	Marc 'BlackJack' Rintsch


From rt8396 at gmail.com  Sun Feb  1 03:02:55 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 00:02:55 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <f752104b-8337-4cf3-a7ca-6deb9d5c325f@v4g2000yqa.googlegroups.com>

On Feb 1, 1:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?

That's like asking boxers or briefs, everybody thinks their choice is
the best. I like freedom if that gives you a hint. :)


From bj_666 at gmx.net  Sun Feb  1 03:04:42 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 1 Feb 2009 08:04:42 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<mailman.8294.1233249573.3487.python-list@python.org>
	<cdb67709-47fa-401f-b85c-4c0f19f4a8f6@p2g2000prf.googlegroups.com>
	<mailman.8348.1233296162.3487.python-list@python.org>
	<325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
Message-ID: <6ul3cpFg1sraU2@mid.uni-berlin.de>

On Sat, 31 Jan 2009 09:08:25 -0800, thmpsn.m.k wrote:

> On Jan 30, 12:15?am, Chris Rebert <c... at rebertia.com> wrote:
>> - Python supports encapsulation. Prefixing an attribute/method with an
>> underscore indicates that other programmers should treat it as
>> 'private'. However, unlike B&D languages, Python itself does nothing to
>> enforce this privacy, leaving it instead to the good judgement of the
>> programmer, under the philosophy that "We're all consenting adults
>> here".
> 
> How do you know? (I know I'm not.)

Then stay with B&D languages.  :-)

> Seriously, though, the lack of private members does allow for ugly hacks
> in user code, and you know there are always ugly hackers.

So what?  The hacks in Java to access private fields are even uglier IMHO.

>> This allows people to meddle with internals, at their own risk, if it
>> ends up being absolutely necessary.
> 
> If it ends up being necessary, the class's design is flawed.

Maybe that's the reason why it is really necessary.

> (Though in this case, the flaw is easily solved by simply providing a
> getter.)

Simply providing a getter for a private attribute?  I thought that's not 
easily possible in C++ or Java!?  ;-)

>> The enforcement point is
>> largely academic anyway, as most languages' reflection APIs let you
>> poke at ostensibly "private" things.
> 
> If you're talking about getters, then note that this doesn't let you
> modify the member (unless there's a corresponding setter).

It's not about getters but about accessing private fields without any 
getters or setters through the reflection API.  See the article 
`Subverting Java Access Protection for Unit Testing`_ for examples.

.. _Subverting Java Access Protection for Unit Testing:
    http://www.onjava.com/pub/a/onjava/2003/11/12/reflection.html

Ciao,
	Marc 'BlackJack' Rintsch


From apt.shansen at gmail.com  Sun Feb  1 03:14:27 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 00:14:27 -0800 (PST)
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>

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From steve at pearwood.info  Sun Feb  1 03:15:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 19:15:58 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
Message-ID: <0195504e$0$20642$c3e8da3@news.astraweb.com>

Robin Becker wrote:

> Whilst considering a port of old code to python 3 I see that in several
> places we are using type comparisons to control processing of user
> instances (as opposed to instances of built in types eg float, int, str)
> 
> I find that the obvious alternatives are not as fast as the current
> code; func0 below. On my machine isinstance seems slower than type for
> some reason. My 2.6 timings are

First question is, why do you care that it's slower? The difference between
the fastest and slowest functions is 1.16-0.33 = 0.83 microsecond. If you
call the slowest function one million times, your code will run less than a
second longer.

Does that really matter, or are you engaged in premature optimization? In
your test functions, the branches all execute "pass". Your real code
probably calls other functions, makes calculations, etc, which will all
take time. Probably milliseconds rather than microseconds. I suspect you're
concerned about a difference of 0.1 of a percent, of one small part of your
entire application. Unless you have profiled your code and this really is a
bottleneck, I recommend you worry more about making your code readable and
maintainable than worrying about micro-optimisations.

Even more important that being readable is being *correct*, and I believe
that your code has some unexpected failure modes (bugs). See below:



> so func 3 seems to be the fastest option for the case when the first
> test matches, but is poor when it doesn't. Can anyone suggest a better
> way to determine if an object is a user instance?
> 
> ##############################
> from types import InstanceType

I believe this will go away in Python 3, as all classes will be New Style
classes.


> class X:
>      __X__=True

This is an Old Style class in Python 2.x, and a New Style class in Python 3.

Using hasattr('__X__') is a curious way of detecting what you want. I
suppose it could be argued that it is a variety of duck-typing: "if it has
a duck's bill, it must be a duck". (Unless it is a platypus, of course.)
However, attribute names with leading and trailing double-underscores are
reserved for use as "special methods". You should rename it to something
more appropriate: _MAGIC_LABEL, say.

 
> class V(X):
>      pass
> 
> def func0(ob):
>      t=type(ob)
>      if t is InstanceType:
>          pass

This test is too broad. It will succeed for *any* old-style class, not just
X and V instances. That's probably not what you want.

It will also fail if ob is an instance of a New Style class. Remember that
in Python 3, all classes become new-style.


>      elif t in (float, int):
>          pass

This test will fail if ob is a subclass of float or int. That's almost
certainly the wrong behavior. A better way of writing that is:

    elif issubclass(t, (float, int)):
        pass


>      else:
>          pass
> 
> def func1(ob):
>      if isinstance(ob,X):
>          pass

If you have to do type checking, that's the recommended way of doing so.



>      elif type(ob) in (float, int):
>          pass

The usual way to write that is:

    if isinstance(ob, (float, int)):
        pass



Hope this helps,


-- 
Steven



From steve at pearwood.info  Sun Feb  1 03:23:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 19:23:58 +1100
Subject: accessing elements of a tuple
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
Message-ID: <0195522e$0$31512$c3e8da3@news.astraweb.com>

D'Arcy J.M. Cain wrote:

> First of all, list is a reserved word. ?Don't use it as a variable name.

Unless you mean to. Shadowing built-ins is only a bad thing when you do it
by accident.


-- 
Steven



From http  Sun Feb  1 03:25:30 2009
From: http (Paul Rubin)
Date: 01 Feb 2009 00:25:30 -0800
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
Message-ID: <7xzlh6bm2t.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at pearwood.info> writes:
> First question is, why do you care that it's slower? The difference between
> the fastest and slowest functions is 1.16-0.33 = 0.83 microsecond. 

That's a 71% speedup, pretty good if you ask me.

> If you call the slowest function one million times, your code will
> run less than a second longer.

What if you call it a billion times, or a trillion times, or a
quadrillion times, you see where this is going?  If you're testing
100-digit numbers, there are an awful lot of them before you run out.


From casevh at gmail.com  Sun Feb  1 03:27:09 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 00:27:09 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>

On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
> Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> ? ? ? ? ? ? ? ? ? ? for root in powersp:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> which is probably very inefficient, but I can't see anything better.....
>
> Tim

Take a look at gmpy and the is_power function. I think it will do
exactly what you want.

http://code.google.com/p/gmpy/

casevh


From Shawn at Milochik.com  Sun Feb  1 03:34:30 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Sun, 1 Feb 2009 03:34:30 -0500
Subject: Searching a file for multiple strings (PS)
In-Reply-To: <6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com>
	<mailman.8503.1233463160.3487.python-list@python.org>
	<6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
Message-ID: <2dc0c81b0902010034p102cd9c2t2e20d656cb22fd9d@mail.gmail.com>

On Sun, Feb 1, 2009 at 1:14 AM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 1, 3:39 pm, Shawn Milochik <Sh... at Milochik.com> wrote:
>
>> Not to discourage the use of Python, but it seems that fgrep with the
>> -f flag already does exactly what you want. If you're on Windows, you
>> can get the Windows version of fgrep here: http://unxutils.sourceforge.net/
>
> That URL is antique and a dead end. When you find the actual
> sourceforge project page (http://sourceforge.net/projects/unxutils/)
> and browse the forums and the CVS repository, you'll see tumbleweed
> blowing down Main Street and not much else (besides a few whinges
> about that dead end URL, and many unanswered issues).
>
> Alternative: http://gnuwin32.sourceforge.net/
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Thanks very much for the update. I had been using the older versions
(on the rare occasions I've had to use Windows). I didn't know there
was a currently-maintained version.


From mail at microcorp.co.za  Sun Feb  1 03:38:53 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 1 Feb 2009 10:38:53 +0200
Subject: SimpleXMLRPCServer question
References: <0ddb9364-02c9-4c52-aadb-e9d9b2d06b20@e1g2000pra.googlegroups.com><mailman.8423.1233375172.3487.python-list@python.org>
	<185b44c2-fc78-480f-8eb1-6395f7fe7ad7@x6g2000pre.googlegroups.com>
Message-ID: <021901c9844b$e41ba380$0d00a8c0@hendrik>


 "flagg" <iana...04 at gmail.com> wrote:


>Let me see if i can elaborate on the requirements.  I have 20+
>different zone files.  I want the xmlrpc server to be able to
>determine what zone file to open by looking at the incoming xml
>request.  For example one of the functions I have now is to show a DNS
>record (I am using dnspython for most of this work)
>

This is a wrong move, it is too magical - see below

>If i send an xmlrpc request that uses the 'showRecord' function with
>params of 'oracle1.foo.bar.com'  I want to parse the "params" piece
>and then instruct the xml-rpc server to open foo.bar.com.zone for
>reading.  The reason why i was looking at do_Post() and _dispatch was
>to attempt to read the incoming params and do exactly that.
>
>Do you think there is an easier way of accomplishing this, than the
>way I am going about it?

Yes I do.

Why don't you split the functionality into two bits - exactly as if you were
doing
it locally:

- OpenTheThing(whatOrWhere)
- ReadTheRecordAndShowIt(PossiblyWhichRecord)

If it's a remote database you are accessing, then you may need even more
steps, like first doing some select, or whatever - I would get it running
locally, calling local functions directly on the server, and then make them
remote xmlrpc proxy functions, after it's all working.

If you are getting the request from some user input, you can either change
the way you ask the questions, or you do the parsing at point of origen, to
determine what to call, in which sequence.

- Hendrik





From gagsl-py2 at yahoo.com.ar  Sun Feb  1 03:43:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 01 Feb 2009 06:43:43 -0200
Subject: Embedding numpy works once, but not twice??
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
Message-ID: <op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 03:47:27 -0200, Deepak Chandran  
<dchandran1 at tinkercell.com> escribi?:

> I have a program in which I have successfully embedded Python. Now, I  
> want
> to include NumPy as well (and other modules). I am able to import numpy
> once. Then I close the python console in my program and then re-open it.
> When I try to import numpy for a second time, the program crashes. Below  
> is
> a simple version of the problem.

The problem is not with NumPy. You can't run Py_Initialize/Py_Finalize  
more than once. Python doesn't have any mechanism to un-initialize loaded  
modules, and any static data that NumPy had initialized the first time it  
is imported becomes invalid the second time.
Call Py_Initialize at the start of your program, and Py_Finalize at the  
end, never more than once.

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Sun Feb  1 03:56:31 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 00:56:31 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
	<6ecdebf6-a422-4f5a-a99b-2c3ed461d980@w1g2000prk.googlegroups.com>
	<mailman.8511.1233477274.3487.python-list@python.org>
Message-ID: <3a6e40c1-da04-4c68-a6c4-fe373fbe3b72@p23g2000prp.googlegroups.com>

On Feb 1, 7:34?pm, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Sun, Feb 1, 2009 at 1:14 AM, John Machin <sjmac... at lexicon.net> wrote:
> > On Feb 1, 3:39 pm, Shawn Milochik <Sh... at Milochik.com> wrote:
>
> >> Not to discourage the use of Python, but it seems that fgrep with the
> >> -f flag already does exactly what you want. If you're on Windows, you
> >> can get the Windows version of fgrep here:http://unxutils.sourceforge.net/
>
> > That URL is antique and a dead end. When you find the actual
> > sourceforge project page (http://sourceforge.net/projects/unxutils/)
> > and browse the forums and the CVS repository, you'll see tumbleweed
> > blowing down Main Street and not much else (besides a few whinges
> > about that dead end URL, and many unanswered issues).
>
> > Alternative:http://gnuwin32.sourceforge.net/
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Thanks very much for the update. I had been using the older versions
> (on the rare occasions I've had to use Windows). I didn't know there
> was a currently-maintained version.

Read my lips: unxutils is *not* "currently-maintained". Use GnuWin32.


From ntwrkd at gmail.com  Sun Feb  1 04:09:13 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Sun, 1 Feb 2009 01:09:13 -0800
Subject: what IDE is the best to write python?
In-Reply-To: <fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<fqnfsx9k59yaaf2hkrUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <f257b9ab0902010109h3c102b29j166c7e8659d1cdab@mail.gmail.com>

Wingware IDE is pretty good. It's not free though.
http://www.wingware.com/

On Sun, Feb 1, 2009 at 12:14 AM, Stephen Hansen <apt.shansen at gmail.com> wrote:
> On Sat, Jan 31, 2009 at 11:42 PM, mcheung63 at hotmail.com
> <mcheung63 at hotmail.com> wrote:
>>
>> Hi all
>>   what IDE is the best to write python?
>> thanks
>> from Peter (mcheung63 at hotmail.com)
>
> What OS? And define "IDE"? Do you just want an editing environment with say
> class browsing capabilities or do you want an integrated debugger and such?
>
> On the mac, I actually like TextMate and Wing IDE -- both commercial(ish).
> TextMate is like a sex toy its so great to use, but recently I've started
> migrating to WingIDE for my work projects.
>
> For Windows, I used Stani's Python Editor. http://pythonide.blogspot.com/
>
> --S
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From lipun4u at gmail.com  Sun Feb  1 04:27:26 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 01:27:26 -0800 (PST)
Subject: Handle SystemExit exception
Message-ID: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>

My program contains some sys.exit(1) and when its executed an
exception known as SystemExit is thrown.

I tried to handle bu using following code snippet

if __name__ == "__main__":
    try:
        main()  #main contains sys.exit(1)
    except KeyboardInterrupt:
        print "aborted by user"
    except SystemExit:
        pass

But it does not work.

Can anyone help me out ???

Though KeyboradInterrupt is handled, but why SystemExit is not
handles ????

Regards
Asit Dhal


From steve at pearwood.info  Sun Feb  1 04:32:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:32:58 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
Message-ID: <0195625a$0$23675$c3e8da3@news.astraweb.com>

Paul Rubin wrote:

> Steven D'Aprano <steve at pearwood.info> writes:
>> First question is, why do you care that it's slower? The difference
>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>> microsecond.
> 
> That's a 71% speedup, pretty good if you ask me.

Don't you care that the code is demonstrably incorrect? The OP is
investigating options to use in Python 3, but the fastest method will fail,
because the "type is InstanceType" test will no longer work. (I believe the
fastest method, as given, is incorrect even in Python 2.x, as it will
accept ANY old-style class instead of just the relevant X or V classes.)

That reminds me of something that happened to my wife some years ago: she
was in a van with her band's roadies, and one asked the driver "Are you
sure you know where you're going?", to which the driver replied, "Who
cares? We're making great time." (True story.)

If you're going to accept incorrect code in order to save time, then I can
write even faster code:

def func4(ob):
    pass

Trying beating that for speed!


>> If you call the slowest function one million times, your code will
>> run less than a second longer.
> 
> What if you call it a billion times, or a trillion times, or a
> quadrillion times, you see where this is going?

It doesn't matter. The proportion of time saved will remain the same. If you
run it a trillion times, you'll save 12 minutes in a calculation that takes
278 hours to run. Big Effing Deal. Saving such trivial amounts of time is
not worth the cost of hard-to-read or incorrect code.

Of course, if you have profiled your code and discovered that *significant*
amounts of time are being used in type-testing, *then* such a
micro-optimization may be worth doing. But I already allowed for that:

"Does that really matter...?"
(the answer could be Yes)

"Unless you have profiled your code and this really is a bottleneck ..."
(it could be)


> If you're testing 
> 100-digit numbers, there are an awful lot of them before you run out.

Yes. So what? Once you've tested them, then what? If *all* you are doing
them is testing them, your application is pretty boring. Even a print
statement afterwards is going to take 1000 times longer than doing the
type-test. In any useful application, the amount of time used in
type-testing is almost surely going to be a small fraction of the total
runtime. A 71% speedup on 50% of the runtime is significant; but a 71%
speedup on 0.1% of the total execution time is not.



-- 
Steven



From gagsl-py2 at yahoo.com.ar  Sun Feb  1 04:45:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 01 Feb 2009 07:45:30 -0200
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
Message-ID: <op.uon2p42fx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 07:27:26 -0200, asit <lipun4u at gmail.com> escribi?:

> My program contains some sys.exit(1) and when its executed an
> exception known as SystemExit is thrown.

This is normal behaviour - but you should not "see" the SystemExit. Do you  
mean that a stack trace appears in the console?

> I tried to handle bu using following code snippet
>
> if __name__ == "__main__":
>     try:
>         main()  #main contains sys.exit(1)
>     except KeyboardInterrupt:
>         print "aborted by user"
>     except SystemExit:
>         pass
>
> But it does not work.

I've tested adding this:

def main():
   sys.exit(1)

and it exited normally, even after removing the SystemExit clause.

> Can anyone help me out ???
>
> Though KeyboradInterrupt is handled, but why SystemExit is not
> handles ????

Perhaps there is another try/except somewhere else that handles SystemExit?
Look for bare except clauses, like

try:
except: ...

They should *not* be used. With Python 2.5 and above, theh "catch-all"  
should be written as:

try:
except Exception: ...

If you are using 2.4 or earlier, should be:

try:
except (SystemExit, KeyboardInterrupt): raise
except: ...

-- 
Gabriel Genellina



From steve at pearwood.info  Sun Feb  1 04:46:20 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:46:20 +1100
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
Message-ID: <0195657c$0$20662$c3e8da3@news.astraweb.com>

asit wrote:

> My program contains some sys.exit(1) and when its executed an
> exception known as SystemExit is thrown.
> 
> I tried to handle bu using following code snippet
> 
> if __name__ == "__main__":
>     try:
>         main()  #main contains sys.exit(1)
>     except KeyboardInterrupt:
>         print "aborted by user"
>     except SystemExit:
>         pass
> 
> But it does not work.

It works for me:

>>> try:
...     sys.exit()
... except SystemExit:
...     pass
... 
>>> 


What does it do for you? Crash? Exit? print garbage to the screen?


I'm going to guess what you are doing. Do you have code like this?

try:
    main()  #main contains sys.exit(1)
except KeyboardInterrupt:
    print "aborted by user"
except SomeOtherException, SystemExit:
    pass

This will mask SystemExit and stop it from being caught. It should be
written like this:

except (SomeOtherException, SystemExit):
    pass



Or possibly something like this?

try:
    main()  #main contains sys.exit(1)
except KeyboardInterrupt:
    print "aborted by user"
except Exception:
    do_something()
    raise
except SystemExit:
    pass

The Exception clause will catch SystemExit before the SystemExit clause will
see it. That should be written like this:


except SystemExit:
    pass
except Exception:
    do_something()
    raise




-- 
Steven



From steve at pearwood.info  Sun Feb  1 04:51:47 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Feb 2009 20:51:47 +1100
Subject: Please help to play 5 jpegs as a slideshow in JES(Jython) ---
	BEGINNER.
References: <28dec764-64e4-4a47-87d5-ba3b52e3b051@r36g2000prf.googlegroups.com>
Message-ID: <019566c3$0$20644$c3e8da3@news.astraweb.com>

steve at savechicago.org wrote:

> Hello, I am a brand brand new programming student in Jython and I have
> been working on a simple homework assignment in JES for the last 12
> hours and am completely lost.
> 
> Basically, we have to make a jpeg slideshow with 5 different pictures
> with audio background that lasts 60 seconds. I have absolutely no idea
> where to begin and am more lost than I was 12 hours ago.
> 
> 
> 
> def pickAndShow():
> 
> myfile = pickAFile()
> mypicture = makePicture(myfile)
> show(mypicture)
> 
> I know this is how to call up a picture from your hard drive. That?s
> about all I know. I have no idea how to call up 5 of them, one at a
> time, and with audio in the background. 

If you can call up *one* picture, then you should be able to call up a
second one, then a third, then a fourth, then a fifth, and then you're
done.


-- 
Steven



From lipun4u at gmail.com  Sun Feb  1 05:29:54 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 02:29:54 -0800 (PST)
Subject: Handle SystemExit exception
References: <f5f1187e-da3c-45fe-8356-b11cf21ac3b9@n33g2000pri.googlegroups.com>
	<0195657c$0$20662$c3e8da3@news.astraweb.com>
Message-ID: <d51192af-47ec-474f-9123-df496b76a1ba@a39g2000prl.googlegroups.com>

Thanx everyone

This is my fault. Exception was thrown before the main function.


From lipun4u at gmail.com  Sun Feb  1 05:34:39 2009
From: lipun4u at gmail.com (asit)
Date: Sun, 1 Feb 2009 02:34:39 -0800 (PST)
Subject: exception in urllib2
Message-ID: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>

I hv been developing a link scanner. Here the objective is to
recursively scan a particular web site.

During this, my script met http://images.google.co.in/imghp?hl=en&tab=wi
and passed it to the scan function, whose body is like this..

def scan(site):
    log=open(logfile,'a')
    log.write(site + "\n")
    site = "http://" + site.lower()
    try:
        site_data = urllib.urlopen(site)
        parser = MyParser()
        parser.parse(site_data.read())
    except(IOError),msg:
        print "Error in connecting site ", site
        print msg
    links = parser.get_hyperlinks()
    for l in links:
        log.write(l + "\n")

But it throws a weird exception like this...

Traceback (most recent call last):
  File "I:\Python26\linkscan1.py", line 104, in <module>
    main()
  File "I:\Python26\linkscan1.py", line 95, in main
    scan(lk)
  File "I:\Python26\linkscan1.py", line 65, in scan
    site_data = urllib.urlopen(site)
  File "I:\Python26\lib\urllib.py", line 87, in urlopen
    return opener.open(url)
  File "I:\Python26\lib\urllib.py", line 203, in open
    return getattr(self, name)(url)
  File "I:\Python26\lib\urllib.py", line 327, in open_http
    h = httplib.HTTP(host)
  File "I:\Python26\lib\httplib.py", line 984, in __init__
    self._setup(self._connection_class(host, port, strict))
  File "I:\Python26\lib\httplib.py", line 656, in __init__
    self._set_hostport(host, port)
  File "I:\Python26\lib\httplib.py", line 668, in _set_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
httplib.InvalidURL: nonnumeric port: ''

How can i handle this ???


From bbxx789_05ss at yahoo.com  Sun Feb  1 06:00:18 2009
From: bbxx789_05ss at yahoo.com (7stud)
Date: Sun, 1 Feb 2009 03:00:18 -0800 (PST)
Subject: exception in urllib2
References: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>
Message-ID: <5ce2bf59-7923-457c-8141-e3ab65e531cd@y23g2000pre.googlegroups.com>

On Feb 1, 3:34?am, asit <lipu... at gmail.com> wrote:
> I hv been developing a link scanner. Here the objective is to
> recursively scan a particular web site.
>
> During this, my script methttp://images.google.co.in/imghp?hl=en&tab=wi
> and passed it to the scan function, whose body is like this..
>
> def scan(site):
>

So you have this:

site=http://images.google.co.in/imghp?hl=en&tab=wi

??



> ? ? log=open(logfile,'a')
> ? ? log.write(site + "\n")
> ? ? site = "http://" + site.lower()
>

So now:

site = "http://" + "http://images.google.co.in/imghp?hl=en&tab=wi"

Hmmm...let's see what happens when I run the following program:


import urllib

site = "http://" + "http://images.google.co.in/imghp?hl=en&tab=wi"
html = urllib.urlopen(site)

--output:--
Traceback (most recent call last):
  File "6test.py", line 4, in ?
    html = urllib.urlopen(site)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 82, in urlopen
    return opener.open(url)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 190, in open
    return getattr(self, name)(url)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/urllib.py", line 303, in open_http
    h = httplib.HTTP(host)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 1097, in __init__
    self._setup(self._connection_class(host, port, strict))
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 586, in __init__
    self._set_hostport(host, port)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/httplib.py", line 598, in _set_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
httplib.InvalidURL: nonnumeric port: ''




From bbxx789_05ss at yahoo.com  Sun Feb  1 06:20:26 2009
From: bbxx789_05ss at yahoo.com (7stud)
Date: Sun, 1 Feb 2009 03:20:26 -0800 (PST)
Subject: exception in urllib2
References: <d57db0de-8a15-41ad-85d0-5ad96db13f1e@r15g2000prh.googlegroups.com>
Message-ID: <81681f17-4b92-46b5-9875-a1b8ae191ae5@v18g2000pro.googlegroups.com>

On Feb 1, 3:34?am, asit <lipu... at gmail.com> wrote:
> I hv been developing a link scanner. Here the objective is to
> recursively scan a particular web site.
>
> During this, my script methttp://images.google.co.in/imghp?hl=en&tab=wi
> and passed it to the scan function, whose body is like this..
>
> def scan(site):
> ? ? log=open(logfile,'a')
> ? ? log.write(site + "\n")
> ? ? site = "http://" + site.lower()
> ? ? try:
> ? ? ? ? site_data = urllib.urlopen(site)
> ? ? ? ? parser = MyParser()
> ? ? ? ? parser.parse(site_data.read())
> ? ? except(IOError),msg:
> ? ? ? ? print "Error in connecting site ", site
> ? ? ? ? print msg
> ? ? links = parser.get_hyperlinks()
> ? ? for l in links:
> ? ? ? ? log.write(l + "\n")
>
> But it throws a weird exception like this...
>
> Traceback (most recent call last):
> ? File "I:\Python26\linkscan1.py", line 104, in <module>
> ? ? main()
> ? File "I:\Python26\linkscan1.py", line 95, in main
> ? ? scan(lk)
> ? File "I:\Python26\linkscan1.py", line 65, in scan
> ? ? site_data = urllib.urlopen(site)
> ? File "I:\Python26\lib\urllib.py", line 87, in urlopen
> ? ? return opener.open(url)
> ? File "I:\Python26\lib\urllib.py", line 203, in open
> ? ? return getattr(self, name)(url)
> ? File "I:\Python26\lib\urllib.py", line 327, in open_http
> ? ? h = httplib.HTTP(host)
> ? File "I:\Python26\lib\httplib.py", line 984, in __init__
> ? ? self._setup(self._connection_class(host, port, strict))
> ? File "I:\Python26\lib\httplib.py", line 656, in __init__
> ? ? self._set_hostport(host, port)
> ? File "I:\Python26\lib\httplib.py", line 668, in _set_hostport
> ? ? raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
> httplib.InvalidURL: nonnumeric port: ''
>
> How can i handle this ???

"Handle" as in how do I catch that exception?  The exception's name is
give in the error message.  Look at the last line.  To catch that
exception, you can do this:

import httplib   #that's the module the exception lives in
                 #as indicated in error message

try:
    ....
    ....
    ....
except httplib.InvalidURL, e:
    print e
    print "Bad url"






From hubaghdadi at gmail.com  Sun Feb  1 06:22:36 2009
From: hubaghdadi at gmail.com (Hussein B)
Date: Sun, 1 Feb 2009 03:22:36 -0800 (PST)
Subject: What is wrong in my list comprehension?
Message-ID: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>

Hey,
I have a log file that doesn't contain the word "Haskell" at all, I'm
just trying to do a little performance comparison:
++++++++++++++
from datetime import time, timedelta, datetime
start = datetime.now()
print start
lines = [line for line in file('/media/sda4/Servers/Apache/
Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
print 'Number of lines contains "Haskell" = ' +  str(len(lines))
end = datetime.now()
print end
++++++++++++++
Well, the script is returning the whole file's lines number !!
What is wrong in my logic?
Thanks.


From a at nospam.org  Sun Feb  1 06:35:52 2009
From: a at nospam.org (Armin)
Date: Sun, 01 Feb 2009 12:35:52 +0100
Subject: py2exe + SQLite problem
In-Reply-To: <mailman.8467.1233414964.3487.python-list@python.org>
References: <mailman.7802.1232715395.3487.python-list@python.org>	<54542453-3479-4953-94c7-b9df50714761@k36g2000pri.googlegroups.com>	<mailman.7815.1232725996.3487.python-list@python.org>	<glsgi3$oln$1@online.de>	<mailman.8317.1233270751.3487.python-list@python.org>	<glupg7$pad$1@online.de>	<mailman.8363.1233320984.3487.python-list@python.org>	<gm1kv5$aqh$1@online.de>
	<mailman.8467.1233414964.3487.python-list@python.org>
Message-ID: <gm41d1$f70$1@online.de>


Hello,

Thanks to all ... it's working now !

Google isn't always your friend :) I found in the net a lot but wrong 
examples for specification of "data_files". Now I have the correct one.

Best Regards

--Armin



Gabriel Genellina wrote:
> En Sat, 31 Jan 2009 11:51:16 -0200, Armin <a at nospam.org> escribi?:
>> Gabriel Genellina wrote:
>>> En Fri, 30 Jan 2009 09:50:08 -0200, Armin <a at nospam.org> escribi?:
> 
>>>  Right at the end: "To install data files directly in the target 
>>> directory, an empty string should be given as the directory."
>>>  setup(...,
>>>       data_files=[
>>>            ('', ['list/of/file/names', 
>>> 'perhaps/including/source/directory']),
>>>            ]
>>>      )
>>>
>> Yes ... so far the theory :)
>>
>> As posted before ... set's my script (python 2.3):
> 
> You didn't tell us that you were using version 2.3 -- it's important, as 
> the current stable releases are 2.6 and 3.0. Anyway, this should work in 
> 2.3 too.
> 
>> from distutils.core import setup
>> import py2exe
>>
>> setup(windows=['dpconf.py'],
>>      data_files=[ "", ["proj_db","gsd_db","dachs2.xbm"]]
>>      )
>>
> 
> Comparing my example and yours, you lack a parenthesis level:
> 
> setup(windows=['dpconf.py'],
>       data_files=[("", ["proj_db","gsd_db","dachs2.xbm"])]
>       )
> 
>> When I create the distribution I got the following err msg:
>>
>> *** copy data files ***
>> warning: install_data: setup script did not provide a directory for '' 
>> -- installing right in 'C:\pyDPCONF.2.3-dev\dist'
>> error: can't copy '': doesn't exist or not a regular file
>>
>> Looks a little bit inconsistent ?
> 
> O thou of little faith, try again...
> 


From __peter__ at web.de  Sun Feb  1 06:37:00 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 01 Feb 2009 12:37:00 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
Message-ID: <gm41gr$c6i$01$1@news.t-online.com>

Hussein B wrote:

> Hey,
> I have a log file that doesn't contain the word "Haskell" at all, I'm
> just trying to do a little performance comparison:
> ++++++++++++++
> from datetime import time, timedelta, datetime
> start = datetime.now()
> print start
> lines = [line for line in file('/media/sda4/Servers/Apache/
> Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
> print 'Number of lines contains "Haskell" = ' +  str(len(lines))
> end = datetime.now()
> print end
> ++++++++++++++
> Well, the script is returning the whole file's lines number !!
> What is wrong in my logic?
> Thanks.

"""
find(...)
    S.find(sub [,start [,end]]) -> int

    Return the lowest index in S where substring sub is found,
    such that sub is contained within s[start:end].  Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
"""

a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
context.

Use

[line for line in open(...) if line.find("Haskell") != -1]

or, better

[line for line in open(...) if "Haskell" in line]

to get the expected result.

Peter


From clp2 at rebertia.com  Sun Feb  1 06:39:06 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 03:39:06 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902010339r4d3cdd85n5060f74515f8d28c@mail.gmail.com>

On Sun, Feb 1, 2009 at 3:22 AM, Hussein B <hubaghdadi at gmail.com> wrote:
> Hey,
> I have a log file that doesn't contain the word "Haskell" at all, I'm
> just trying to do a little performance comparison:
> ++++++++++++++
> from datetime import time, timedelta, datetime
> start = datetime.now()
> print start
> lines = [line for line in file('/media/sda4/Servers/Apache/
> Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]

>From the help() for str.find:
find(...)
<snip>
    Return -1 on failure.

~ $ python
Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
[GCC 4.0.1 (Apple Inc. build 5484)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> bool(-1)
True

str.find() returns -1 on failure (i.e. if the substring is not in the
given string).
-1 is considered boolean true by Python.
Therefore, your list comprehension will contain all lines that don't
*start* with "Haskell" rather than all lines that don't *contain*
"Haskell".

Use `if "Haskell" in line` instead of `if line.find("Haskell")`. It's
even easier to read that way.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jstroud at mbi.ucla.edu  Sun Feb  1 06:39:27 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 01 Feb 2009 03:39:27 -0800
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <2Nfhl.9862$8_3.3929@flpi147.ffdc.sbc.com>

mcheung63 at hotmail.com wrote:
> Hi all
>    what IDE is the best to write python?
> thanks
> from Peter (mcheung63 at hotmail.com)

vim in one terminal, ipython in the other.

-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA  90095

http://www.jamesstroud.com


From johan.de.taeye at gmail.com  Sun Feb  1 06:52:58 2009
From: johan.de.taeye at gmail.com (jdetaeye)
Date: Sun, 1 Feb 2009 03:52:58 -0800 (PST)
Subject: Embedded python 2.6 interpreter can't "import sqlite3" on Windows XP
Message-ID: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>


I am porting an application which embeds a Python interpreter to
Python 2.6.
On version 2.5 all is working fine, but importing the sqlite3 module
doesn't work any more on 2.6.

The statement  "import sqlite3" does work fine when executed from in
the python command prompt, ie not from the embedded interpreter.
The same import gives the following error when executed from the
embedded interpreter.
   Python stacktrace:
       Traceback (most recent call last):
         File "<string>", line 2, in <module>
         File "C:\Python26\lib\sqlite3\__init__.py", line 24, in
<module>
           from dbapi2 import *
         File "C:\Python26\lib\sqlite3\dbapi2.py", line 27, in
<module>
           from _sqlite3 import *
       ImportError: DLL load failed: A dynamic link library (DLL)
initialization routine failed.
   Windows popup window:
       Runtime Error!
       R6034
       An application has made an attempt to load the C runtime
library incorrectly.
       Please contact the application's support team for more
information.

Unfortunately the "application support team" (that is me :-) has no
idea on how to move forward on this:
a) I guess this is releated to the problem with manifest files,
already reported in http://bugs.python.org/issue4120 ?
b) What could be a solution or workaround for the problem?

All the above is on Windows XP.
Other modules with have an extension DLL (such as ssl) give exactly
the same problem.

All help appreciated,

Johan



From nemesis at nowhere.invalid  Sun Feb  1 07:04:09 2009
From: nemesis at nowhere.invalid (Nemesis)
Date: 01 Feb 2009 12:04:09 GMT
Subject: [ANN] XPN 1.2.6
Message-ID: <49858fb9$0$1110$4fafbaef@reader3.news.tin.it>

XPN (X Python Newsreader) is a multi-platform newsreader with Unicode
support. It is written with Python+GTK. It has features like
scoring/actions, X-Face and Face decoding, muting of quoted text,
newsrc import/export, find article and search in the body, spoiler
char/rot13, random taglines and configurable attribution lines.

You can find it on:

http://xpn.altervista.org/index-en.html

or

http://sf.net/projects/xpn


Changes in this release:

    * v1.2.6: Now threads with unread watched articles are underlined
    * v1.2.6: added a visualization option that lets you hide threads without
              watched articles
    * v1.2.6: fixed a bug that caused XPN not to kill old articles reapplying rules
    * v1.2.6: fixed a bug that caused crashes when using ID with extended chars

XPN is translated in Italian French and German, if you'd like to translate it
in your language and you are familiar with gettext and po-files
editing please contact me (xpn at altervista.org).
-- 
To succeed in the world it is not enough to be stupid, you must also be
well-mannered.
 _  _                  _
| \| |___ _ __  ___ __(_)___
| .` / -_) '  \/ -_|_-< (_-<
|_|\_\___|_|_|_\___/__/_/__/ http://xpn.altervista.org



From matthewbdaly at googlemail.com  Sun Feb  1 07:07:05 2009
From: matthewbdaly at googlemail.com (MattBD)
Date: Sun, 1 Feb 2009 04:07:05 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>

On Feb 1, 7:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?
> thanks
> from Peter (mcheun... at hotmail.com)

I like Vim, that works really well for me when coding in Python.
Enable syntax highlighting and it's a great development environment.
It's a little tough at first but run vimtutor and you'll soon start to
get the hang of it.

IMHO, scripting languages like Python are generally better suited to
working with a text editor than an IDE.


From stef.mientki at gmail.com  Sun Feb  1 07:19:04 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 13:19:04 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
Message-ID: <49859338.2000105@gmail.com>


> IMHO, scripting languages like Python are generally better suited to
> working with a text editor than an IDE.
>   
I don't understand that, because in my opinion yields
  IDE = texteditor + (much) more
please could you explain (as I'm very interested in user interfaces in 
general )

cheers,
Stef


From robin at NOSPAMreportlab.com  Sun Feb  1 07:33:36 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Sun, 01 Feb 2009 12:33:36 +0000
Subject: fastest way to detect a user type
In-Reply-To: <0195625a$0$23675$c3e8da3@news.astraweb.com>
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
	<0195625a$0$23675$c3e8da3@news.astraweb.com>
Message-ID: <498596A0.6030005@jessikat.plus.net>

Steven D'Aprano wrote:
> Paul Rubin wrote:
> 
>> Steven D'Aprano <steve at pearwood.info> writes:
>>> First question is, why do you care that it's slower? The difference
>>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>>> microsecond.
>> That's a 71% speedup, pretty good if you ask me.
> 
> Don't you care that the code is demonstrably incorrect? The OP is
> investigating options to use in Python 3, but the fastest method will fail,
> because the "type is InstanceType" test will no longer work. (I believe the
> fastest method, as given, is incorrect even in Python 2.x, as it will
> accept ANY old-style class instead of just the relevant X or V classes.)

I'm not clear why this is true? Not all instances will have the __X__ 
attribute or has something else changed in Python3?

The original code was intended to be called with only a subset of all 
class instances being passed as argument; as currently written it was 
unsafe because an instance of an arbitrary old class would pass into 
branch 1. Of course it will still be unsafe as arbitrary instances end 
up in branch 3

The intent is to firm up the set of cases being accepted in the first 
branch. The problem is that when all instances are new style then 
there's no easy check for the other acceptable arguments eg float,int, 
str etc, as I see it, the instances must be of a known class or have a 
distinguishing attribute.

As for the timing, when I tried the effect of func1 on our unit tests I 
noticed that it slowed the whole test suite by 0.5%. Luckily func 3 
style improved things by about 0.3% so that's what I'm going for.
-- 
Robin Becker


From steve at holdenweb.com  Sun Feb  1 07:45:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 07:45:42 -0500
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <49855129.9070901@shopzeus.com>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
Message-ID: <gm45hn$sbf$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>> 8<------------------------------
>>
>>  
>>> .......  Setting the
>>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>>> though).
>>>     
>>
>> Why not?  I have been merrily setting it, and I have not noticed
>> anything weird.
>> (yet)
>>   
> Please see my original post. I specifically stated that I do not want to
> use setsockopt and be able to listen on the same port from many
> processes. I knew that I could use SO_REUSEADDR, but I'm heistating to
> do so. I must guarantee that only one process listens on a given port at
> the same time.
> 
This appears to demonstrate a misunderstanding of the purpose of the
SO_REUSEADDR flag.

SO_REUSEADDR should be used to avoid the TIME_WAIT state when the
current listening process terminates. If you do not use it then there
will be a certain period during which no other process can listen on
that port, and it will be reusable only after the TIME_WAIT is over.
This can easily be seen by using the netstat utility.

See "Pitfall 3" in

http://www.ibm.com/developerworks/linux/library/l-sockpit/index.html

> Maybe I could use some kind of locking, but it would be too difficult:
> 
> - mutexes are great but they are platform dependent and they are not in
> the standard lib
> - the listening processes do not see each other's home directory so file
> locking cannot be used for this
> - these processes will probably listen on many ports at the same time,
> it is also a problem with mutexes/file locks (who wants 50 lock files to
> be created?)
> 
Complete red herring:  there is no way for multiple processes to listen
to the same port: this would lead to ambiguity in the protocol stack.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From notvalid2 at sbcglobal.net  Sun Feb  1 07:47:00 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Sun, 01 Feb 2009 04:47:00 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8488.1233440963.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>
	<mailman.8488.1233440963.3487.python-list@python.org>
Message-ID: <_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> r wrote:
>>>>> On Jan 28, 10:12 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>>> Where in the world is a description of pack() for Tkinter widgets?
>>>>>> Is it
>>>>>> some sort of general method for all widgets? I'm looking in a few
>>>>>> docs that
>>>>>> use it without ever saying where it is described. For one,
>>>>>> <http://effbot.org/tkinterbook/label.htm>. In the NM Tech pdf on
>>>>>> Tkinter,
>>>>>> it's not found anywhere. I see Universal methods for widgets, but no
>>>>>> mention
>>>>>> of pack(). package, packed, but no pack.
>>>>> did you try here :)
>>>>> http://effbot.org/tkinterbook/pack.htm
>>>> Thanks. I have the site bookmarked, but it's hard to search. I posted a
>>>> comment to them that they should have it in pdf form.
>>>>
>>> http://letmegooglethatforyou.com/?q=site%3Aeffbot.org%2Ftkinterbook+pack
>>>
>>> regards
>>>  Steve
>> Well, that's an interesting "link". Another side of Google facilities?
>> Maybe you're using Snagit or its brethern? However, I'm interested in
>> searching a pdf, which, of course, doesn't yet exist.
>>
> OK, someone asked if you'd seen the HTML pages. You replied that you had
> them bookmarked but they were difficult to search. So I simply
> demonstrated that a search of the site for "pack" gave the right page as
> its first result.
> 
> Maybe you *do* want a PDF, but it will be less searchable than the
> existing HTML, so I am somewhat confused about why.
> 
> regards
>  Steve
So what are you telling me? I should use Google to search the web site? If 
so, I guess I missed the method you used. Apparently, it hinges on the key 
"site:" The use of your video tool camouflaged your intent, IMHO.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From clp2 at rebertia.com  Sun Feb  1 07:53:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 04:53:20 -0800
Subject: is python Object oriented??
In-Reply-To: <325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<mailman.8294.1233249573.3487.python-list@python.org>
	<cdb67709-47fa-401f-b85c-4c0f19f4a8f6@p2g2000prf.googlegroups.com>
	<mailman.8348.1233296162.3487.python-list@python.org>
	<325fcc08-c090-44f9-b158-967e6dec212a@13g2000yql.googlegroups.com>
Message-ID: <50697b2c0902010453r6a2e7ef4ma6870cbe38032e83@mail.gmail.com>

On Sat, Jan 31, 2009 at 9:08 AM,  <thmpsn.m.k at gmail.com> wrote:
> On Jan 30, 12:15 am, Chris Rebert <c... at rebertia.com> wrote:
>> - Python supports encapsulation. Prefixing an attribute/method with an
>> underscore indicates that other programmers should treat it as
>> 'private'. However, unlike B&D languages, Python itself does nothing
>> to enforce this privacy, leaving it instead to the good judgement of
>> the programmer, under the philosophy that "We're all consenting adults
>> here".
>
> How do you know? (I know I'm not.)
>
> Seriously, though, the lack of private members does allow for ugly
> hacks in user code, and you know there are always ugly hackers.

Marc already addressed your points excellently, but I'll add that I
once read somewhere (can't be bothered to find the source, PG maybe?)
that mediocre programming languages are designed for average
programmers and presume the language designers are smarter than the
programmer, whereas the truly great languages are designed for great
programmers and presume that the programmer is smarter than (or at
least knows better than) the designer.

This allows smart programmers using great languages to say: "I don't
like X about the language, I think I'll change it" or "The language
needs Y, I'll add it". For example, see the amazing magic some Python
people have worked using metaclasses.
Whereas smart programmers using a mediocre language are stuck: "I
don't like X about the language and there's nothing I can do about it
short of hacking the language implementation. Darn. Now I'm going to
have to write Y lines every time I want to workaround X since the
language doesn't let me factor the solution out any further! (sigh)".
For example, consider looping through an array in Java before the new
'for' statement was added.

Therefore, Python wisely chooses to not give a damn about how "ugly
hackers" may abuse the language; they'll abuse *any* language they get
their grubby mitts on; just let them and their ugly code quietly rot
in the corner while the elite are allowed by the language the extra
leeway they need to write their code masterpieces, which the common
people can then use to improve their programs.

Not that I'm saying any of us are necessarily elite; just don't be
/particularly/ stupid by using anything *clearly marked* with an
initial underscore without *extremely* good reason. And this isn't to
say the language shouldn't take average programmers into account; just
don't overly restrict the the 90% that are decent programmers in the
name of trying to save the bottom 10% from themselves (it's rather
like the "Save the Children!" retort on /.)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Sun Feb  1 07:58:58 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 07:58:58 -0500
Subject: socket.unbind or socket.unlisten?  - socket.error: (48, 'Address
	already in use')
In-Reply-To: <49855129.9070901@shopzeus.com>
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
Message-ID: <gm46aj$ucc$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>> 8<------------------------------
>>
>>  
>>> .......  Setting the
>>> SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows,
>>> though).
>>>     
>>
>> Why not?  I have been merrily setting it, and I have not noticed
>> anything weird.
>> (yet)
>>   
> Please see my original post. I specifically stated that I do not want to
> use setsockopt and be able to listen on the same port from many
> processes. I knew that I could use SO_REUSEADDR, but I'm heistating to
> do so. I must guarantee that only one process listens on a given port at
> the same time.

My previous reply assumed you are running some UNIX-like operating
system. If you are on Windows then Jean-Paul's advice stands, as Windows
*does* allow several processes to listen on the same port and randomly
delivers incoming connections to one of the listening processes.

I believe this is because Microsoft failed to understand the original
meaning of SO_REUSEADDR for their early TCP implementations, and
persisted with this ghastly error in the name of backwards
compatibility, justifying it by suggesting that listener pools could be
created. Or some such nonsense. Perhaps someone with more insight into
the development process could comment. It seems to me it's completely
bizarre.

However, under Windows 2000 and later you should find there's an
SO_EXCLUSIVEADDRUSE flag which you can use to ensure a single listener -
see http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx. No
need for separate locks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 08:00:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 08:00:42 -0500
Subject: accessing elements of a tuple
In-Reply-To: <0195522e$0$31512$c3e8da3@news.astraweb.com>
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <gm46dq$ucc$2@ger.gmane.org>

Steven D'Aprano wrote:
> D'Arcy J.M. Cain wrote:
> 
>> First of all, list is a reserved word.  Don't use it as a variable name.
> 
> Unless you mean to. Shadowing built-ins is only a bad thing when you do it
> by accident.
> 
Quite. And we should observe that "list" is not a reserved word in the
sense of a keyword with a specific syntactic meaning, otherwise it
wouldn't be possible to shadow it in the first place. It's just the name
of one of Python's built-in types.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From p-santoro at sbcglobal.net  Sun Feb  1 08:20:50 2009
From: p-santoro at sbcglobal.net (Peter)
Date: Sun, 01 Feb 2009 08:20:50 -0500
Subject: Embedded python 2.6 interpreter can't "import sqlite3" on Windows
	XP
In-Reply-To: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>
References: <ae1d39fb-fe63-4da7-99ce-af7b2565fe8e@40g2000prx.googlegroups.com>
Message-ID: <Ukhhl.6113$jZ1.3039@flpi144.ffdc.sbc.com>

jdetaeye wrote:
> I am porting an application which embeds a Python interpreter to
> Python 2.6.
> On version 2.5 all is working fine, but importing the sqlite3 module
> doesn't work any more on 2.6.
> 
> The statement  "import sqlite3" does work fine when executed from in
> the python command prompt, ie not from the embedded interpreter.
> The same import gives the following error when executed from the
> embedded interpreter.
>    Python stacktrace:
>        Traceback (most recent call last):
>          File "<string>", line 2, in <module>
>          File "C:\Python26\lib\sqlite3\__init__.py", line 24, in
> <module>
>            from dbapi2 import *
>          File "C:\Python26\lib\sqlite3\dbapi2.py", line 27, in
> <module>
>            from _sqlite3 import *
>        ImportError: DLL load failed: A dynamic link library (DLL)
> initialization routine failed.
>    Windows popup window:
>        Runtime Error!
>        R6034
>        An application has made an attempt to load the C runtime
> library incorrectly.
>        Please contact the application's support team for more
> information.
> 
> Unfortunately the "application support team" (that is me :-) has no
> idea on how to move forward on this:
> a) I guess this is releated to the problem with manifest files,
> already reported in http://bugs.python.org/issue4120 ?
> b) What could be a solution or workaround for the problem?
> 
> All the above is on Windows XP.
> Other modules with have an extension DLL (such as ssl) give exactly
> the same problem.
> 
> All help appreciated,
> 
> Johan
> 

Python 2.6+ was built with Visual Studio 2008; therefore, the Microsoft 
Visual C++ 2008 Redistributable Package (run time libraries) must be 
installed on the computer that you are trying to run your python 
application.  If the computer already has Python 2.6+ installed "for all 
users", then the run time libraries should already be installed in 
c:\windows\winsxs.  On computers that do not have Python 2.6+ installed 
(or it was installed using "Install Just for Me"), you probably will 
need to install the Visual C++ 2008 Redistributable Package.  It is 
possible that some other application already installed the correct run 
time libraries in the c:\windows\winsxs directory.

Visual C++ 2008 Redistributable Package:
http://www.microsoft.com/downloads/details.aspx?FamilyID=9b2da534-3e03-4391-8a4d-074b9f2bc1bf&displaylang=en

After installing the Visual C++ 2008 Redistributable, you can find it 
under the c:\windows\winsxs directory.

Side-by-Side (sxs) Assemblies are Microsoft's answer to "DLL hell" and 
Visual C++ 2005 had them, too.  I believe the reason the Python 
community didn't see these problems earlier was that most computers 
already had the proper run time libraries installed.  See "Application 
Compatibility?Side-by-side Assemblies" in 
http://msdn.microsoft.com/en-us/magazine/cc302206.aspx and 
http://msdn.microsoft.com/en-us/magazine/ms997620.aspx for more 
information on Side-by-Side Assemblies.

Note that if future versions of Python are built with Visual Studio 2008 
with service pack (SP) #x and the build specifies that the SP #x updated 
run time libraries should be used, then you'll need to install the 
updated run time libraries.  See 
http://msdn.microsoft.com/en-us/library/cc664727.aspx and 
http://msdn.microsoft.com/en-us/library/ms235299(VS.80).aspx for more 
information on binding applications to specific run time libraries.

The following articles may also be of interest:

http://msdn.microsoft.com/en-us/library/ms235531.aspx
http://msdn.microsoft.com/en-us/library/ms235342.aspx
http://msdn.microsoft.com/en-us/library/aa374224.aspx

Of course everything I've just said may change with the next release of 
Python, because the Python maintainers are apparently looking at 
alternative ways around this issue.  Although I'm not a Microsoft fan, 
I'm not yet convinced that trying to work around Microsoft's winsxs 
requirements is a smart thing to do.

It might simplify things for python users and developers if the Python 
2.6+ installers always installed the VS C++ run time libraries into the 
winsxs directory.  Perhaps python tools that create embedded python 
applications could better document this issue, so that people using 
embedded applications will know that they have to install the proper run 
time libraries.  It's also possible that Microsoft will someday install 
these new Visual Studio 2008 run time libraries via their update service 
or a future service pack.

Peter


From matthewbdaly at googlemail.com  Sun Feb  1 08:25:53 2009
From: matthewbdaly at googlemail.com (MattBD)
Date: Sun, 1 Feb 2009 05:25:53 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<mailman.8517.1233490750.3487.python-list@python.org>
Message-ID: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>

On Feb 1, 12:19?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> > IMHO, scripting languages like Python are generally better suited to
> > working with a text editor than an IDE.
>
> I don't understand that, because in my opinion yields
> ? IDE = texteditor + (much) more
> please could you explain (as I'm very interested in user interfaces in
> general )
>
> cheers,
> Stef

Obviously, this is just my opinion. The great debate over which is
better, an IDE or text editor, has been going on for years, and no
doubt plenty of other people will disagree.

Really it depends what you are doing. Some languages are very tightly
integrated with an IDE, such as MS Visual C#, and as far as I can see
it would be extremely difficult, if not impossible to use a text
editor with that language. If you only use one language and that has
an IDE you like, there's nothing wrong with sticking with that.

IDE's are often (but not always) designed for a specific language.
Text editors are more flexible and will generally work well with
virtually any language. You may lose a little in terms of language-
specific functionality such as autocompletion and fancy graphical
tools, but you gain in flexibility because the one text editor will
work well with many languages, so you can write programs in C, Perl,
Python, Ruby, or whatever takes your fancy, and still use the same
tools you're used to, which I'd argue makes you more productive as
you're working within a familiar environment. However, there are IDE's
which support multiple languages, such as Eclipse.

Also, I'm strongly of the opinion that using a text editor when you
get started is the way to go. You're more likely to take in every last
detail of something if you type out the commands in detail rather than
using autocompletion. Also, an IDE can add an unnecessary level of
complication - as well as learning a language you have to learn an
IDE, which can be extremely complex. So it can be simpler to just use
a text editor, which is often simpler.

Conversely, IDE's can be better for designing interfaces as they
generally allow you to design them in a way that's more intuitive to
most people.

It's not exactly true to say that an IDE = text editor + much more.
It's more about the nature of the features. A modern programmer's text
editor such as Vim is an extremely powerful and flexible piece of
software. I've just barely started to scratch the surface of what Vim
can do and I learn something new virtually every time I use it.
Although technically it can mean you have to do more typing than you
would with an IDE, it also makes it a lot faster to type the text you
put in.

An IDE will roll everything you need into one package, including the
compiler/interpreter, editor and debugger. A text editor does the text
editing only, but in practice most of them allow you to access the
command line from within the text editor (in Vim you just enter :!
followed by the command you want to run), so you can use other tools
from within the editor. I do most of my coding in Linux, so I would
write a program in Vim, save it, then enter something like :!python
example.py to run it.

At the end of the day it's personal taste. I've tinkered with a few
IDE's but I find text editors work better for me at the end of the
day, and Vim in particular is one that really works well for me. It
does depend on what you're doing. For larger projects sometimes a
dedicated IDE is better, but most decent text editors can do a lot of
the same things that an IDE can. It just requires a different
approach.

I'd recommend you check out this article:
http://osteele.com/archives/2004/11/ides
That gives a good insight into the whole IDE's vs text editors thing.


From Platcool at gmail.com  Sun Feb  1 08:47:49 2009
From: Platcool at gmail.com (BlakeF)
Date: Sun, 1 Feb 2009 05:47:49 -0800 (PST)
Subject: persistent TCP connection in python using socketserver
References: <mailman.8299.1233255293.3487.python-list@python.org>
Message-ID: <5b7dce20-c707-4372-8af8-e403ce8de82a@y23g2000pre.googlegroups.com>

On Jan 29, 8:54?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 29 Jan 2009 08:38:43 -0800 (PST), markobrie... at gmail.com wrote:
> >G'day
>
> >I'm currently usingsocketserverto build a simple XMLSocket (an XML
> >based protocol used for communication between flash and the outside
> >world) server. I've got flash establishing a connection, sending a
> >request and my python server responding. However at this point
> >socketserverterminates the connection. Which is bad, since i need a
> >persistentconnection so i can push data from the server to the client
> >without the overhead of polling.
>
> If you don't want the connection to close, then don't let the request
> complete. ?SocketServerimplements logic for single request/response
> per connection. ?You can change this by making your requests take a
> really long time (until you're done with the connection) or you can
> override the behavior which closes the connection after a response.
>
> Or you could use the socket module, on which theSocketServermodule is
> based. ?Or you could use Twisted, another higher-level package built on
> the socket module (mostly). ?Actually, I recommend Twisted, since it will
> mostly isolate you from boring low-level details and let you implement
> whatever high-level behavior you're after (I know that a bunch of people
> have used it to communicate with Flash, for example).
>
> Jean-Paul

Hi,

Jean-Paul has something like this in mind (I think):

class Foobar(BaseRequestHandler):
  def handle(self):
    self.data = None
    while self.data != 'QUIT':
      self.data = self.request.recv(1024).strip().upper()
      if self.data == '':
        sleep(1)
      else:
        self.request.send(self.data)

This will keep a persistent connection, only closing on 'quit' being
received.  I'm sure it's not the best way, but it certainly works.

Cheers,
-Blake


From steve at holdenweb.com  Sun Feb  1 08:56:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 08:56:27 -0500
Subject: Tkinter w.pack()?
In-Reply-To: <_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>
	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
Message-ID: <gm49mb$7bj$1@ger.gmane.org>

W. eWatson wrote:
> Steve Holden wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> r wrote:
>>>>>> On Jan 28, 10:12 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>>>> Where in the world is a description of pack() for Tkinter widgets?
>>>>>>> Is it
>>>>>>> some sort of general method for all widgets? I'm looking in a few
>>>>>>> docs that
>>>>>>> use it without ever saying where it is described. For one,
>>>>>>> <http://effbot.org/tkinterbook/label.htm>. In the NM Tech pdf on
>>>>>>> Tkinter,
>>>>>>> it's not found anywhere. I see Universal methods for widgets, but no
>>>>>>> mention
>>>>>>> of pack(). package, packed, but no pack.
>>>>>> did you try here :)
>>>>>> http://effbot.org/tkinterbook/pack.htm
>>>>> Thanks. I have the site bookmarked, but it's hard to search. I
>>>>> posted a
>>>>> comment to them that they should have it in pdf form.
>>>>>
>>>> http://letmegooglethatforyou.com/?q=site%3Aeffbot.org%2Ftkinterbook+pack
>>>>
>>>>
>>>> regards
>>>>  Steve
>>> Well, that's an interesting "link". Another side of Google facilities?
>>> Maybe you're using Snagit or its brethern? However, I'm interested in
>>> searching a pdf, which, of course, doesn't yet exist.
>>>
>> OK, someone asked if you'd seen the HTML pages. You replied that you had
>> them bookmarked but they were difficult to search. So I simply
>> demonstrated that a search of the site for "pack" gave the right page as
>> its first result.
>>
>> Maybe you *do* want a PDF, but it will be less searchable than the
>> existing HTML, so I am somewhat confused about why.
>>
>> regards
>>  Steve
> So what are you telling me? I should use Google to search the web site?
> If so, I guess I missed the method you used. Apparently, it hinges on
> the key "site:" The use of your video tool camouflaged your intent, IMHO.
> 
The use of "letmegooglethatforyou" (not my video tool, by the way) is to
point out that with the right search string you could have answered the
question for yourself.

Since you didn't appear to know that Google allowed you to search a
single site (something I perhaps take for granted) I am glad that point
wasn't lost. Yes, you can just search the PIL documentation. Isn't the
Internet great? ;-)

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From fasteliteprogrammer at yahoo.com  Sun Feb  1 09:10:46 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Sun, 1 Feb 2009 06:10:46 -0800 (PST)
Subject: what IDE is the best to write python?
Message-ID: <531189.66795.qm@web36504.mail.mud.yahoo.com>

eclipse

--- On Sun, 2/1/09, Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:

From: Dennis Lee Bieber <wlfraed at ix.netcom.com>
Subject: Re: what IDE is the best to write python?
To: python-list at python.org
Date: Sunday, February 1, 2009, 3:31 AM

On Sat, 31 Jan 2009 23:42:42 -0800 (PST), "mcheung63 at hotmail.com"
<mcheung63 at hotmail.com> declaimed the following in comp.lang.python:

> Hi all
>? ? what IDE is the best to write python?

??? The one in which YOU are most comfortable.
-- 
??? Wulfraed??? Dennis Lee Bieber??? ??? KD6MOG
??? wlfraed at ix.netcom.com??? ??? wulfraed at bestiaria.com
??? ??? HTTP://wlfraed.home.netcom.com/
??? (Bestiaria Support Staff:??? ??? web-asst at bestiaria.com)
??? ??? HTTP://www.bestiaria.com/
--
http://mail.python.org/mailman/listinfo/python-list



      
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From darcy at druid.net  Sun Feb  1 09:32:42 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 1 Feb 2009 09:32:42 -0500
Subject: accessing elements of a tuple
In-Reply-To: <0195522e$0$31512$c3e8da3@news.astraweb.com>
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <20090201093242.199b7e8c.darcy@druid.net>

On Sun, 01 Feb 2009 19:23:58 +1100
Steven D'Aprano <steve at pearwood.info> wrote:
> D'Arcy J.M. Cain wrote:
> 
> > First of all, list is a reserved word. ?Don't use it as a variable name.
> 
> Unless you mean to. Shadowing built-ins is only a bad thing when you do it
> by accident.

I suppose but I am having a hard time trying to think of some good
reason to replace a builtin function that creates a list with a list
object.

>>> list = list((1,2,3))
>>> list((1,2,3))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'list' object is not callable

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From stef.mientki at gmail.com  Sun Feb  1 09:33:51 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 15:33:51 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
	<e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <4985B2CF.3080001@gmail.com>

thanks Matthew,
for the extended answer
and the great link,
I'm going to study that carefully.

cheers,
Stef


MattBD wrote:
> On Feb 1, 12:19 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>   
>>> IMHO, scripting languages like Python are generally better suited to
>>> working with a text editor than an IDE.
>>>       
>> I don't understand that, because in my opinion yields
>>   IDE = texteditor + (much) more
>> please could you explain (as I'm very interested in user interfaces in
>> general )
>>
>> cheers,
>> Stef
>>     
>
> Obviously, this is just my opinion. The great debate over which is
> better, an IDE or text editor, has been going on for years, and no
> doubt plenty of other people will disagree.
>
> Really it depends what you are doing. Some languages are very tightly
> integrated with an IDE, such as MS Visual C#, and as far as I can see
> it would be extremely difficult, if not impossible to use a text
> editor with that language. If you only use one language and that has
> an IDE you like, there's nothing wrong with sticking with that.
>
> IDE's are often (but not always) designed for a specific language.
> Text editors are more flexible and will generally work well with
> virtually any language. You may lose a little in terms of language-
> specific functionality such as autocompletion and fancy graphical
> tools, but you gain in flexibility because the one text editor will
> work well with many languages, so you can write programs in C, Perl,
> Python, Ruby, or whatever takes your fancy, and still use the same
> tools you're used to, which I'd argue makes you more productive as
> you're working within a familiar environment. However, there are IDE's
> which support multiple languages, such as Eclipse.
>
> Also, I'm strongly of the opinion that using a text editor when you
> get started is the way to go. You're more likely to take in every last
> detail of something if you type out the commands in detail rather than
> using autocompletion. Also, an IDE can add an unnecessary level of
> complication - as well as learning a language you have to learn an
> IDE, which can be extremely complex. So it can be simpler to just use
> a text editor, which is often simpler.
>
> Conversely, IDE's can be better for designing interfaces as they
> generally allow you to design them in a way that's more intuitive to
> most people.
>
> It's not exactly true to say that an IDE = text editor + much more.
> It's more about the nature of the features. A modern programmer's text
> editor such as Vim is an extremely powerful and flexible piece of
> software. I've just barely started to scratch the surface of what Vim
> can do and I learn something new virtually every time I use it.
> Although technically it can mean you have to do more typing than you
> would with an IDE, it also makes it a lot faster to type the text you
> put in.
>
> An IDE will roll everything you need into one package, including the
> compiler/interpreter, editor and debugger. A text editor does the text
> editing only, but in practice most of them allow you to access the
> command line from within the text editor (in Vim you just enter :!
> followed by the command you want to run), so you can use other tools
> from within the editor. I do most of my coding in Linux, so I would
> write a program in Vim, save it, then enter something like :!python
> example.py to run it.
>
> At the end of the day it's personal taste. I've tinkered with a few
> IDE's but I find text editors work better for me at the end of the
> day, and Vim in particular is one that really works well for me. It
> does depend on what you're doing. For larger projects sometimes a
> dedicated IDE is better, but most decent text editors can do a lot of
> the same things that an IDE can. It just requires a different
> approach.
>
> I'd recommend you check out this article:
> http://osteele.com/archives/2004/11/ides
> That gives a good insight into the whole IDE's vs text editors thing.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From marko.loparic at gmail.com  Sun Feb  1 10:13:36 2009
From: marko.loparic at gmail.com (markolopa)
Date: Sun, 1 Feb 2009 07:13:36 -0800 (PST)
Subject: python alternative to java rapid ajax platform (RAP)?
Message-ID: <226786ae-5e21-4b27-a7e6-7143f03ca1cb@r41g2000prr.googlegroups.com>

Hi,

Do you know a python alternative to rapid ajax platform (RAP)?

For the development of a user interface for mathematical models
someone suggested to use eclipse and that tool:

http://www.eclipse.org/rap/
http://www.eclipse.org/rap/about.php

If I understand correctly it allows you to design very easily a web
client interacting with your application (in particular you write no
javascript and qooxdoo is called for you). It seems to be to be a very
interesting package except that... it is in java. So I would like to
know if there is something similar using python.

Alternatively I would like to know if there is a way to use this tool
doing the minimum in java and the most in python (probably not).

Thanks!
Marko


From google at mrabarnett.plus.com  Sun Feb  1 10:27:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 01 Feb 2009 15:27:48 +0000
Subject: is python Object oriented??
In-Reply-To: <m2ljsq4vyq.fsf@valheru.db3l.homeip.net>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>	<4981985B.4070108@wildenhain.de>	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<m2ljsq4vyq.fsf@valheru.db3l.homeip.net>
Message-ID: <4985BF74.9030300@mrabarnett.plus.com>

David Bolen wrote:
> thmpsn.m.k at gmail.com writes:
> 
>> I don't know how you would do it in C# (or Java for that matter).
>>
>> In C++ you can play with pointers to "get at" some memory location
>> somewhere in the object. The only portable way to know the exact
>> location between the beginning of the object and the desired member is
>> the offsetof() macro, but as I understand it this only works for POD
>> types, which means that it won't work for classes such as:
>>
>> class NonPOD
>> {
>> private:
>>     int a;
>>     int b;
>> public:
>>     NonPOD();
>>     ~NonPOD();
>>     int C();
>> };
>>
>> (I haven't ever actually tried it, so I'm not sure.)
>>
>> Nevertheless, you can play and hope for the best. For example, if the
>> member you want to get at is 'b', then you can do:
>>
>> NonPOD obj;
>> std::cout << "obj.b = " << *(int*) ((unsigned char*) &obj + sizeof
>> (int)) << std::endl;
>>
>> and hope that the compiler didn't leave a hole between the 'a' member
>> and the 'b' member.
> 
> Probably moving off topic, but I don't think you have to get anywhere
> near that extreme in terms of pointers, unless you're trying to deal
> with instances for which you have no source but only opaque pointers.
> 
> I haven't gotten stuck having to do this myself yet, but I believe one
> commmon "hack" for the sort of class you show above is to just
> "#define private public" before including the header file containing
> the class definition.  No fiddling with pointers, offsets, or
> whatever, just normal object access syntax past that point.
> 
> Of course, I believe such a redefinition violates the letter of the
> C++ standard, but most preprocessors do it anyway.  Also, it won't
> handle the case where the "private:" is not used, but the members are
> just declared prior to any other definition, since a class is private
> by default.
> 
[snip]
You can also "#define class struct" before including the header file. 
The only difference between 'class' and 'struct' in C++ is that the 
members of a class are private by default and the members of a struct 
are public by default.


From cito at online.de  Sun Feb  1 10:33:51 2009
From: cito at online.de (Christoph Zwerschke)
Date: Sun, 01 Feb 2009 16:33:51 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
Message-ID: <gm4fcr$tr7$1@online.de>

It cost me a while to analyze the cause of the following problem.

The symptom was that testing a local web app with twill was fast
on Python 2.3, but very slow on Python 2.4-2.6 on a Win XP box.

This boiled down to the problem that if you run a SimpleHTTPServer
for localhost like this,

   BaseHTTPServer.HTTPServer(('localhost', 8000),
       SimpleHTTPServer.SimpleHTTPRequestHandler).serve_forever()

and access it using httplib.HTTPConnection on the same host like this

   httplib.HTTPConnection('localhost', 8000).connect()

then this call is fast using Py 2.3, but slow with Py 2.4-2.6.

I found that this was caused by a mismatch of the ip version used
by SimpleHTTPServer and HTTPConnection for a "localhost" argument.

What actually happens is the following:

* BaseHTTPServer binds only to the IPv4 address of localhost, because
   it's based on TCPServer which has address_family=AF_INET by default.

* HTTPConnection.connect() however tries to connect to all IP addresses
   of localhost, in the order determined socket.getaddrinfo('localhost').

   With Py 2.3 (without IPv6 support) this is only the IPv4 address,
   but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
   first, then the IPv4 address. Since the IPv6 address is checked first,
   this gives a timeout and causes the slow connect() call. The order by
   which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
   on the glibc version, so it may be a problem on other platforms, too.

You can see the cause of the slow connect() like this:

   import httplib
   conn = httplib.HTTPConnection('localhost', 8000)
   conn.set_debuglevel(1)
   conn.connect()

This is what I get:

   connect: (localhost, 8000)
   connect fail: ('localhost', 8000)
   connect: (localhost, 8000)

The first (failing) connect is the attempt to connect to the IPv6
address which BaseHTTPServer doesn't listen to. (This is the debug
output of Py 2.5 which really should be improved to show the IP address
that is actually used. Unfortunately, in Py 2.6 the debug output when
connecting has even fallen prey to a refactoring. I think it should
either be added again or set_debuglevel() is now pretty meaningless.)

Can we do something about the mismatch that SimpleHTTPServer only serves
IPv4, but HTTPConnection tries to connect with IPv6 first?

I guess other people also stumbled over this, maybe without even
noticing and just wondering about the slow performance. E.g.:
http://schotime.net/blog/index.php/2008/05/27/slow-tcpclient-connection-sockets/

One possible solution would be to improve the TCPServer in the standard
lib so that it determines the address_family and real server_address
based on the first return value of socket.getaddrinfo, like this:

class TCPServer(BaseServer):
     ...

     def __init__(self, server_address, RequestHandlerClass):
         if server_address and len(server_address) == 2:
             (self.address_family, dummy, dummy, dummy,
                 server_address) = socket.getaddrinfo(*server_address)[0]
         else:
             raise TypeError("server_address must be a 2-tuple")
         BaseServer.__init__(self, server_address, RequestHandlerClass)
         ...

That way, if you either serve as or connect to 'localhost', you will
always consistently do this via IPv4 or IPv6, depending on what is
preferred on your platform.

Does this sound reasonable? Any better ideas?

-- Christoph


From vedrandekovic at yahoo.com  Sun Feb  1 10:44:55 2009
From: vedrandekovic at yahoo.com (vedrandekovic at yahoo.com)
Date: Sun, 1 Feb 2009 07:44:55 -0800 (PST)
Subject: Python time measure question (timeit)
Message-ID: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>

Hello,

When I run following code with os.popen  (for this time measure I'm
using python module timeit):


for i in range(50):
    print i


I get this result:  0.00246958761519


But when I run same code from IDLE i get this result:
6.4533341528e-005


now, I have two questions:
              1) Which of this results is correct?
              2) Are this results in micro seconds?


Regards,
John


From kimwlias at gmail.com  Sun Feb  1 10:48:50 2009
From: kimwlias at gmail.com (kimwlias)
Date: Sun, 1 Feb 2009 07:48:50 -0800 (PST)
Subject: Problems installing PySQLite, SQLite and Trac
Message-ID: <1f1e74d1-f8b4-49e8-92d7-24c2354c8ca7@o40g2000prn.googlegroups.com>

My initial goal is to finally install Trac. This is the second day
I've been trying to make this possible but I can't find, for the life
of me, how to do this. OK, here is the story:

My system is a VPS with CentOS 5.

I found out that I have two versions of python: 2.4 at /usr/bin/
python2.4 and 2.5.2 at /usr/local/apps/python/bin/python2.5

My first try was to download the SQLite amalgamation, './configure',
'make' and 'make install'. Then I downloaded the PySQLite and 'python
setup.py install'. The funny part is that python2.4 has sqlite while
python2.5 doesn't:



    [root at xxx]# python
    Python 2.5.2 (r252:60911, May 10 2008, 17:42:40)
    [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] on linux2
    Type "help", "copyright", "credits" or "license" for more
information.
    >>> import sqlite
    Traceback (most recent call last):
    File "", line 1, in
    ImportError: No module named sqlite

    [root at xxx]# python2.4
    Python 2.4.3 (#1, Mar 14 2007, 18:51:08)
    [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
    Type "help", "copyright", "credits" or "license" for more
information.
    >>> import sqlite
    >>>

After some more research I found out that the amalgamation is not the
default way and I needed to run the extended_setup.py which isn't
inside the pysqlite! -> http://oss.itsystementwicklung.de/trac/pysqlite/wiki/PysqliteAmalgamation

I then thought, "OK, let's install the SQLite from the precompiled
binary packages". So I downloaded the first two packages from here:
http://www.sqlite.org/download.html . The one contains a .bin file and
the other an .so file. I must admit, I'm relatively new in Linux so I
don't know what do with these files. And there is NO DOCUMENTATION
what so ever on how to use these two in the SQLite website. Not even a
slight hint where to look for. The so called documentation is just a
download version of the website....

You can find some more information about my problem here:
http://stackoverflow.com/questions/500055/issues-installing-sqlite-pysqlite-trac-in-centos

I really really really need your help. Thank you so much in advance.


From berserker992 at gmail.com  Sun Feb  1 11:01:43 2009
From: berserker992 at gmail.com (berserker992 at gmail.com)
Date: Sun, 1 Feb 2009 08:01:43 -0800 (PST)
Subject: Problem With py2exe and ConfigParser
Message-ID: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>

Hello, i use python 2.6 + PyQt4.
I compile my main.pyw. It is compile, but don't run. In
"index.exe.log" error log:

>>>  File "index.pyw", line 100, in GetVal
>>>ConfigParser.NoSectionError: No section: 'Main'




>>>Code line 92 to 104 this is class that uses ConfigParser lib:
>>>class ConfigAcces:
>>>    def __init__(self):
>>>        self.cnf = ConfigParser()
>>>    def GetLibUrl(self):
>>>        self.cnf.read("config.ini")
>>>        return self.cnf.get("Main","lib_path")
>>>    def GetVal(self, p, key):
>>>        self.cnf.read("config.ini")
>>>        return self.cnf.get(p,key)
>>>    def SetVal(self, selection, option, NewVal):
>>>        self.cnf.read("config.ini")
>>>        self.cnf.set(selection,option,NewVal)
>>>        self.cnf.write(open("config.ini", "w"))



how do I fix this?


From grante at visi.com  Sun Feb  1 11:01:52 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 01 Feb 2009 10:01:52 -0600
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Address already in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<004e01c98095$f90f9440$0d00a8c0@hendrik>
	<49855129.9070901@shopzeus.com>
	<mailman.8520.1233493150.3487.python-list@python.org>
Message-ID: <QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d@posted.usinternet>

On 2009-02-01, Steve Holden <steve at holdenweb.com> wrote:

> I believe this is because Microsoft failed to understand the
> original meaning of ___________________, and persisted with
> this ghastly error in the name of backwards compatibility,
> justifying it by suggesting that _________________________.

Somebody should have cards printed up...

-- 
Grant



From steve at pearwood.info  Sun Feb  1 11:02:17 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Mon, 02 Feb 2009 03:02:17 +1100
Subject: fastest way to detect a user type
References: <49847EBB.4050307@jessikat.plus.net>
	<0195504e$0$20642$c3e8da3@news.astraweb.com>
	<7xzlh6bm2t.fsf@ruckus.brouhaha.com>
	<0195625a$0$23675$c3e8da3@news.astraweb.com>
	<498596A0.6030005@jessikat.plus.net>
Message-ID: <0195bd97$0$14422$c3e8da3@news.astraweb.com>

Robin Becker wrote:

> Steven D'Aprano wrote:
>> Paul Rubin wrote:
>> 
>>> Steven D'Aprano <steve at pearwood.info> writes:
>>>> First question is, why do you care that it's slower? The difference
>>>> between the fastest and slowest functions is 1.16-0.33 = 0.83
>>>> microsecond.
>>> That's a 71% speedup, pretty good if you ask me.
>> 
>> Don't you care that the code is demonstrably incorrect? The OP is
>> investigating options to use in Python 3, but the fastest method will
>> fail, because the "type is InstanceType" test will no longer work. (I
>> believe the fastest method, as given, is incorrect even in Python 2.x, as
>> it will accept ANY old-style class instead of just the relevant X or V
>> classes.)
> 
> I'm not clear why this is true? Not all instances will have the __X__
> attribute or has something else changed in Python3?

The func0() test doesn't look for __X__.


> The original code was intended to be called with only a subset of all
> class instances being passed as argument; as currently written it was
> unsafe because an instance of an arbitrary old class would pass into
> branch 1. Of course it will still be unsafe as arbitrary instances end
> up in branch 3
> 
> The intent is to firm up the set of cases being accepted in the first
> branch. The problem is that when all instances are new style then
> there's no easy check for the other acceptable arguments eg float,int,
> str etc, 

Of course there is.

isinstance(ob, (float, int)) 

is the easy, and correct, way to check if ob is a float or int.


> as I see it, the instances must be of a known class or have a 
> distinguishing attribute.

Are you sure you need to check for different types in the first place? Just
how polymorphic is your code, really? It's hard to judge because I don't
know what your code actually does.


> As for the timing, when I tried the effect of func1 on our unit tests I
> noticed that it slowed the whole test suite by 0.5%. 

An entire half a percent slower. Wow.

That's like one minute versus one minute and 0.3 second. Or one hour, versus
one hour and 18 seconds. I find it very difficult to get worked up over
such small differences. I think you're guilty of premature optimization:
wasting time and energy trying to speed up parts of the code that are
trivial. (Of course I could be wrong, but I doubt it.)



> Luckily func 3 
> style improved things by about 0.3% so that's what I'm going for.

I would call that the worst solution. Not only are you storing an attribute
which is completely redundant (instances already know what type they are,
you don't need to manually store a badge on them to mark them as an
instance of a class), but you're looking up this attribute only to
immediately throw away the value you get. The only excuse for this extra
redirection would be if it were significantly faster. But it isn't: you
said it yourself, 0.3% speed up. That's like 60 seconds versus 59.82
seconds.


-- 
Steven



From dchandran1 at tinkercell.com  Sun Feb  1 11:33:29 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Sun, 1 Feb 2009 08:33:29 -0800
Subject: Embedding numpy works once, but not twice??
In-Reply-To: <op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>
References: <5dfe78f40901312147i957450ei187b08028c068a6@mail.gmail.com>
	<op.uonzu5e9x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <5dfe78f40902010833o14097535k379cca019c47316e@mail.gmail.com>

I sort of guessed that was the issue -- doing Py_Initialize/Py_Finalize more
than once. Thanks for the help.

On Sun, Feb 1, 2009 at 12:43 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Sun, 01 Feb 2009 03:47:27 -0200, Deepak Chandran <
> dchandran1 at tinkercell.com> escribi?:
>
>  I have a program in which I have successfully embedded Python. Now, I want
>> to include NumPy as well (and other modules). I am able to import numpy
>> once. Then I close the python console in my program and then re-open it.
>> When I try to import numpy for a second time, the program crashes. Below
>> is
>> a simple version of the problem.
>>
>
> The problem is not with NumPy. You can't run Py_Initialize/Py_Finalize more
> than once. Python doesn't have any mechanism to un-initialize loaded
> modules, and any static data that NumPy had initialized the first time it is
> imported becomes invalid the second time.
> Call Py_Initialize at the start of your program, and Py_Finalize at the
> end, never more than once.
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From deets at nospam.web.de  Sun Feb  1 11:39:29 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 01 Feb 2009 17:39:29 +0100
Subject: Problem With py2exe and ConfigParser
In-Reply-To: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
Message-ID: <6um1i1FfqskrU1@mid.uni-berlin.de>

berserker992 at gmail.com schrieb:
> Hello, i use python 2.6 + PyQt4.
> I compile my main.pyw. It is compile, but don't run. In
> "index.exe.log" error log:
> 
>>>>  File "index.pyw", line 100, in GetVal
>>>> ConfigParser.NoSectionError: No section: 'Main'
> 
> 
> 
> 
>>>> Code line 92 to 104 this is class that uses ConfigParser lib:
>>>> class ConfigAcces:
>>>>    def __init__(self):
>>>>        self.cnf = ConfigParser()
>>>>    def GetLibUrl(self):
>>>>        self.cnf.read("config.ini")
>>>>        return self.cnf.get("Main","lib_path")
>>>>    def GetVal(self, p, key):
>>>>        self.cnf.read("config.ini")
>>>>        return self.cnf.get(p,key)
>>>>    def SetVal(self, selection, option, NewVal):
>>>>        self.cnf.read("config.ini")
>>>>        self.cnf.set(selection,option,NewVal)
>>>>        self.cnf.write(open("config.ini", "w"))
> 
> 
> 
> how do I fix this?


By passing the right path for the configuration file? It's obviously not 
found.

Diez


From steve at holdenweb.com  Sun Feb  1 11:42:37 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 11:42:37 -0500
Subject: Python time measure question (timeit)
In-Reply-To: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
Message-ID: <gm4je0$93f$1@ger.gmane.org>

vedrandekovic at yahoo.com wrote:
> Hello,
> 
> When I run following code with os.popen  (for this time measure I'm
> using python module timeit):
> 
> 
> for i in range(50):
>     print i
> 
> 
> I get this result:  0.00246958761519
> 
> 
> But when I run same code from IDLE i get this result:
> 6.4533341528e-005
> 
> 
> now, I have two questions:
>               1) Which of this results is correct?

Both are. What makes you think that printing in IDLE (to a GUI) should
take the same amount of time as it does "running with os.popen (whatever
that means). The two environments are likely to be completely different,
but you haven't show the exact code you ran so it's hard to be more exact.

>               2) Are this results in micro seconds?
> 
No, seconds, as it says in the documentation:

"""This executes the setup statement once, and then returns the time it
takes to execute the main statement a number of times, measured in
seconds as a float""".

Even a modern computer doesn't do much in .0024 microseconds.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cd at okunah.de  Sun Feb  1 11:47:39 2009
From: cd at okunah.de (Christof Donat)
Date: Sun, 01 Feb 2009 17:47:39 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
Message-ID: <gm4jlo$u3v$1@svr7.m-online.net>

Hi,

>> IMHO, scripting languages like Python are generally better suited to
>> working with a text editor than an IDE.
>>   
> I don't understand that, because in my opinion yields
>   IDE = texteditor + (much) more
> please could you explain (as I'm very interested in user interfaces in
> general )

Try to think of the operating system as the IDE. At least with Unix and 
similar systems that is a really powerfull solution. It includes not only 
vim, bash and make, but also stuff like e.g. ctags, awk, sed, etc. Even 
python itsself is part of the system and can be used for special purpous 
utilities like e.g. code generators.

If you need User Interface Design, there are quite powerful stand alone 
tools, like e.g. the QtDesigner which can be used with that "OS IDE".

Christof




From thmpsn.m.k at gmail.com  Sun Feb  1 11:52:35 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Sun, 1 Feb 2009 08:52:35 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com> 
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com> 
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
Message-ID: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>

On Feb 1, 1:50?am, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Sat, 31 Jan 2009 15:28:14 -0800, thmpsn.m.k wrote:
> > On Jan 31, 2:27?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> Do you honestly believe that C++'s private members are really private?
> >> Privateness is only enforced during parsing time. Nobody can stop you
> >> from messing around with header files or memory. You can still access
> >> and modify private members but it's all messy and ugly. Even C# and
> >> .NET don't stop you from doing nasty things from unmananged assemblies.
>
> > I don't know how you would do it in C# (or Java for that matter).
>
> In Java you can use reflection to get your fingers on private fields.
>
> > In C++ you can play with pointers to "get at" some memory location
> > somewhere in the object.
> > [Snipped pointer fiddling explanation]
> > So: Sometimes it may work, usually it will be unsafe and/or non-
> > portable, and in most cases the procedure will look complicated.
>
> Or ``#define private public`` before including the header files. ?Which
> doesn't look complicated to me.

Which again won't always work, if:

(a) the header defines another macro, say, "PRIVATE", as "private",
and uses PRIVATE to declare private members
(b) the members are preceded with neither "private:" nor "public:" nor
"protected:", in which case they'll be private by default
(c) someone else suggested that point (b) is defeated by defining a
macro named "class" as "struct", which will make members public by
default; well, we can do something similar to what we did in point
(a): define a macro, say, "CLASS", as "class", and use CLASS the
define the class

Anyway, it doesn't matter. We're losing the point here. The point is
that language support for private access, by disallowing user access
to private data, provides an unambiguous information hiding mechanism
which encourages encapsulation. Python's approach, however, which is
only a naming convention rather than a language feature, merely TRUSTS
the programmer not to break encapsulation. And sure, if we're all good
programmers, everything will go well and we'll end up with an
organized application. But the danger is still there: at any given
time, we COULD break encapsulation!



From apt.shansen at gmail.com  Sun Feb  1 12:10:12 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 09:10:12 -0800 (PST)
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>

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From timmichelsen at gmx-topmail.de  Sun Feb  1 12:17:34 2009
From: timmichelsen at gmx-topmail.de (Tim Michelsen)
Date: Sun, 01 Feb 2009 18:17:34 +0100
Subject: Config files editor
Message-ID: <gm4lgh$fdv$1@ger.gmane.org>

Hello Python,
does anyone know of a Python based project that has a GUI based 
functionality to edit
config files read/written by ConfigParser?

I found a command line tool here:

pyinieditor - Google Code - http://code.google.com/p/pyinieditor/

But I'd rather go with a GUI tool.

Thanks in advance and kind regards,
Timmie



From kyrie at uh.cu  Sun Feb  1 12:23:57 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 01 Feb 2009 12:23:57 -0500
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <1233509037.4985daadd8b2a@mail.uh.cu>


Quoting thmpsn.m.k at gmail.com:

> > Or ``#define private public`` before including the header files. ?Which
> > doesn't look complicated to me.
> 
> Which again won't always work, if:
> 
> (a) the header defines another macro, say, "PRIVATE", as "private",
> and uses PRIVATE to declare private members

[other reasons deleted]

So, can I assume that most of the C++ code out there defines "PRIVATE" as
"private" just to prevent breaking the encapsulation _intentionally_? Somehow I
find that hard to believe.

> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation.

And Python, by providing a well defined convention of what is inaccessible,
provides an unambiguous information hiding mechanism wich encourages encapsulation.

> Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

And what's the problem with that, exactly? I can break encapsulation... and I
can jump off my roof. Why do _you_ care about what _I_ can do, as long as it
doesn't harm _you_ (or others)?

If you are worried about you breaking encapsulation, then just don't do it. It
is not hard. Whenever you find yourself typing "._somehting", just check that
the string before the dot is "self". If you can't trust yourself to access only
the well identified "public" attributes, how can you trust that you will just
not make "public" a private attribute anyway?

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From vicente.soler at gmail.com  Sun Feb  1 12:24:37 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 09:24:37 -0800 (PST)
Subject: getting values from a text file (newby)
Message-ID: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>

Hi,

My foo.txt file contains the following:

1,"house","2,5"
2,"table","6,7"
3,"chair","-4,5"

... as seen with notepad.

This file was created with the OpenOffice Calc spreadsheet, but since
I use comma as the decimal separator for numbers, the last value in
each line appears sorrounded by quotes.

I would like to obtain:

[[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]

in order to process the content of the file. However, so far, I have
not obtained the desired result.

I started testing with (only for first line):

f=open('foo.txt','r')
t=f.readline()
print t
t=t.split(',')
print t
f.close()

But what I am getting is far more complex than what I expected:

1,"house","2,5"

['1', '"house"', '"2', '5"\n']

which is unprocessable.

Can anyboby help?


From steve at holdenweb.com  Sun Feb  1 12:31:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 12:31:27 -0500
Subject: is python Object oriented??
In-Reply-To: <fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <4985DC6F.4030106@holdenweb.com>

Stephen Hansen wrote:
> [...]
> don't play with anyone else's
> privates.
> 
A good rule in life as well as programming.

> The *idea* of encapsulation is good in many cases, it is quite often a
> solid design point and admirable goal. The *implementation* of enforced
> data encapsulation brings no value to any realistic situation.
> 
I think it's noticeable that the people who have been arguing against
what I might tipify as this "libertarian view" are those for whom the
consequences of programming error are serious to extreme.

I think we might have to accept that they are never going to be
comfortable with Python as it's currently constituted, whether or not we
suggest that discipline might replace enforcement.

Just the same, it still doesn't save them from the consequences of
interface miscommunication, as int he case of the Mars lander that
crashed because one module provided a (probably strongly-typed) value in
meters, and the recipient interpreted it as (probably strongly-typed)
feet, cutting the engine out too early.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From vedrandekovic at yahoo.com  Sun Feb  1 12:32:05 2009
From: vedrandekovic at yahoo.com (vedrandekovic at yahoo.com)
Date: Sun, 1 Feb 2009 09:32:05 -0800 (PST)
Subject: Python time measure question (timeit)
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>
	<mailman.8528.1233506575.3487.python-list@python.org>
Message-ID: <7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>

On 1 velj, 17:42, Steve Holden <st... at holdenweb.com> wrote:
> vedrandeko... at yahoo.com wrote:
> > Hello,
>
> > When I run following code with os.popen ?(for this time measure I'm
> > using python module timeit):
>
> > for i in range(50):
> > ? ? print i
>
> > I get this result: ?0.00246958761519
>
> > But when I run same code from IDLE i get this result:
> > 6.4533341528e-005
>
> > now, I have two questions:
> > ? ? ? ? ? ? ? 1) Which of this results is correct?
>
> Both are. What makes you think that printing in IDLE (to a GUI) should
> take the same amount of time as it does "running with os.popen (whatever
> that means). The two environments are likely to be completely different,
> but you haven't show the exact code you ran so it's hard to be more exact.
>
> > ? ? ? ? ? ? ? 2) Are this results in micro seconds?
>
> No, seconds, as it says in the documentation:
>
> """This executes the setup statement once, and then returns the time it
> takes to execute the main statement a number of times, measured in
> seconds as a float""".
>
> Even a modern computer doesn't do much in .0024 microseconds.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Hello again,

This is the code that I ran:

a) Main code:

This code is in .exe:

  t = Timer("import os;os.popen('python myscript.py arg1 2 3')")
  print t.timeit()


b) myscript.py code:

    import sys
    print sys.argv[1]
    var1=int(sys.argv[2])
    var2=int(sys.argv[3])
    var3=var1+var2


Regards,
John






From rt8396 at gmail.com  Sun Feb  1 12:41:21 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 09:41:21 -0800 (PST)
Subject: getting values from a text file (newby)
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
Message-ID: <2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>


Try the csv module

py> import csv
py> reader = csv.reader(open(csvfile, "rb"))
py> for row in reader:
	print row


['1', 'house', '2,5 ']
['2', 'table', '6,7 ']
['3', 'chair', '-4,5 ']


From steve at holdenweb.com  Sun Feb  1 12:50:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 12:50:55 -0500
Subject: getting values from a text file (newby)
In-Reply-To: <2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com>
Message-ID: <gm4ne1$krb$1@ger.gmane.org>

r wrote:
> Try the csv module
> 
> py> import csv
> py> reader = csv.reader(open(csvfile, "rb"))
> py> for row in reader:
> 	print row
> 
> 
> ['1', 'house', '2,5 ']
> ['2', 'table', '6,7 ']
> ['3', 'chair', '-4,5 ']

And then, to conert the last field to numbers? ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From joncle at googlemail.com  Sun Feb  1 12:51:57 2009
From: joncle at googlemail.com (Jon Clements)
Date: Sun, 1 Feb 2009 09:51:57 -0800 (PST)
Subject: Problems installing PySQLite, SQLite and Trac
References: <1f1e74d1-f8b4-49e8-92d7-24c2354c8ca7@o40g2000prn.googlegroups.com>
Message-ID: <92ec1676-7c46-4cb5-beee-da25502ddd15@s1g2000prg.googlegroups.com>

On 1 Feb, 15:48, kimwlias <kimwl... at gmail.com> wrote:
> My initial goal is to finally install Trac. This is the second day
> I've been trying to make this possible but I can't find, for the life
> of me, how to do this. OK, here is the story:
>
> My system is a VPS with CentOS 5.
>
> I found out that I have two versions of python: 2.4 at /usr/bin/
> python2.4 and 2.5.2 at /usr/local/apps/python/bin/python2.5
>
> My first try was to download the SQLite amalgamation, './configure',
> 'make' and 'make install'. Then I downloaded the PySQLite and 'python
> setup.py install'. The funny part is that python2.4 has sqlite while
> python2.5 doesn't:
>
> ? ? [root at xxx]# python
> ? ? Python 2.5.2 (r252:60911, May 10 2008, 17:42:40)
> ? ? [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more
> information.
> ? ? >>> import sqlite
> ? ? Traceback (most recent call last):
> ? ? File "", line 1, in
> ? ? ImportError: No module named sqlite
>
> ? ? [root at xxx]# python2.4
> ? ? Python 2.4.3 (#1, Mar 14 2007, 18:51:08)
> ? ? [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more
> information.
> ? ? >>> import sqlite
> ? ? >>>
>
> After some more research I found out that the amalgamation is not the
> default way and I needed to run the extended_setup.py which isn't
> inside the pysqlite! ->http://oss.itsystementwicklung.de/trac/pysqlite/wiki/PysqliteAmalgama...
>
> I then thought, "OK, let's install the SQLite from the precompiled
> binary packages". So I downloaded the first two packages from here:http://www.sqlite.org/download.html. The one contains a .bin file and
> the other an .so file. I must admit, I'm relatively new in Linux so I
> don't know what do with these files. And there is NO DOCUMENTATION
> what so ever on how to use these two in the SQLite website. Not even a
> slight hint where to look for. The so called documentation is just a
> download version of the website....
>
> You can find some more information about my problem here:http://stackoverflow.com/questions/500055/issues-installing-sqlite-py...
>
> I really really really need your help. Thank you so much in advance.

IIRC, pysqlite was a wrapper for the SQLite library. However, in
version 2.5+ of Python, it's part of the standard distribution and is
in the module called sqlite3. Just walking throuh the instructions
(although I only have 2.5.2 installed gives me this):

Python 2.5.2 (r252:60911, Oct  5 2008, 19:24:49)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
>>> import pysqlite2


Are you trying to set up using 2.4 or 2.5? I'm just a little confused
as to why if sqlite works on 2.4 which looking at the installation
instruction [ref: http://www.installationwiki.org/Installing_Trac_and_Subversion#Python]
is what's recommended, is what the problem is?

As you're under a redhat derivative, perhaps it might be worth just
getting the rpm(s) for pysqlite2 and that might well sort it out for
you.

Sorry to have not been of more help,

Jon.



From rt8396 at gmail.com  Sun Feb  1 12:59:29 2009
From: rt8396 at gmail.com (r)
Date: Sun, 1 Feb 2009 09:59:29 -0800 (PST)
Subject: getting values from a text file (newby)
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<2428733e-2b4d-4f88-8bb5-bf31fffdf9ca@w24g2000prd.googlegroups.com> 
	<mailman.8533.1233510679.3487.python-list@python.org>
Message-ID: <a71f9db8-201c-436d-b137-303a6587b422@s9g2000prg.googlegroups.com>

On Feb 1, 11:50?am, Steve Holden <st... at holdenweb.com> wrote:
> And then, to conert the last field to numbers? ...

Are you asking me Steve? Well i did not want to short-circuit the OP's
learning process by spoon-feeding him the entire answer. I thought i
would give him a push in the right direction and observe the outcome.

A very intelligent professor once said:
""" It's not about giving a student all the info, only just enough to
spark their own thought process."""




From apt.shansen at gmail.com  Sun Feb  1 13:02:37 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 10:02:37 -0800 (PST)
Subject: getting values from a text file (newby)
In-Reply-To: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
Message-ID: <fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>

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From steve at holdenweb.com  Sun Feb  1 13:05:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 13:05:11 -0500
Subject: Python time measure question (timeit)
In-Reply-To: <7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>
References: <4bea652f-6935-47cb-9610-831d859a0b57@d36g2000prf.googlegroups.com>	<mailman.8528.1233506575.3487.python-list@python.org>
	<7c8f3144-9c31-4e70-9644-c7bea46fe293@r15g2000prd.googlegroups.com>
Message-ID: <gm4o8p$neu$1@ger.gmane.org>

vedrandekovic at yahoo.com wrote:
> On 1 velj, 17:42, Steve Holden <st... at holdenweb.com> wrote:
>> vedrandeko... at yahoo.com wrote:
>>> Hello,
>>> When I run following code with os.popen  (for this time measure I'm
>>> using python module timeit):
>>> for i in range(50):
>>>     print i
>>> I get this result:  0.00246958761519
>>> But when I run same code from IDLE i get this result:
>>> 6.4533341528e-005
>>> now, I have two questions:
>>>               1) Which of this results is correct?
>> Both are. What makes you think that printing in IDLE (to a GUI) should
>> take the same amount of time as it does "running with os.popen (whatever
>> that means). The two environments are likely to be completely different,
>> but you haven't show the exact code you ran so it's hard to be more exact.
>>
>>>               2) Are this results in micro seconds?
>> No, seconds, as it says in the documentation:
>>
>> """This executes the setup statement once, and then returns the time it
>> takes to execute the main statement a number of times, measured in
>> seconds as a float""".
>>
>> Even a modern computer doesn't do much in .0024 microseconds.
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Hello again,
> 
> This is the code that I ran:
> 
> a) Main code:
> 
> This code is in .exe:
> 
>   t = Timer("import os;os.popen('python myscript.py arg1 2 3')")
>   print t.timeit()
> 
Here in order to run the code os.popen() has to create a new subprocess
and initialize the Python interpreter inside it before finally running
myscript.py. I'd say that 2.5 milliseconds is quite acceptable for that.
> 
> b) myscript.py code:
> 
>     import sys
>     print sys.argv[1]
>     var1=int(sys.argv[2])
>     var2=int(sys.argv[3])
>     var3=var1+var2
> 
In the IDLE case I presume you were running the code directly? Obviously
that eliminates the interpreter startup overhead, and so will be much
quicker. 65 microseconds, if I read the times correctly.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gbofspam at gmail.com  Sun Feb  1 13:46:56 2009
From: gbofspam at gmail.com (Andrew Parker)
Date: Sun, 1 Feb 2009 13:46:56 -0500
Subject: subprocess.Popen not creating a pipe
Message-ID: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>

I'm having some fun with Popen.  I have the following line:

    process = subprocess.Popen(command, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
    print process.stdout

Under normal circumstances, this displays:

    <open file '<stdout>', mode 'w' at 0xb7f8e068>

However, I have a binary that I use to kick off this script, and when
that runs, it displays:

    None

So, two questions:

    1.  What the heck is this binary doing that upsets Popen so much?
    2.  What can *my script* do to get around this problem.

Unfortunately I'm stuck using this binary, so its the python where I
have to solve this.

Any ideas?


From rantingrick at gmail.com  Sun Feb  1 13:57:28 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 1 Feb 2009 10:57:28 -0800 (PST)
Subject: Pipe stdout && stderr to a TkLabel widget
References: <3022e071-aaf9-4169-b394-c8b311d05d09@41g2000yqf.googlegroups.com>
	<b23be880-de2b-4f95-8f4f-9fa85b8fd057@h20g2000yqn.googlegroups.com>
Message-ID: <bc163bd7-bd2c-4a20-8e91-dbe3475116df@e24g2000vbe.googlegroups.com>

Hello, anybody. Any help would be good help

Thanks


From aahz at pythoncraft.com  Sun Feb  1 13:57:56 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 10:57:56 -0800
Subject: Pythonic list/tuple/dict layout?
References: <mailman.7952.1232871512.3487.python-list@python.org>
	<871vur39k7.fsf@benfinney.id.au>
Message-ID: <gm4rbk$gp9$1@panix3.panix.com>

In article <871vur39k7.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>
>I actually use this style:
>
>    foo = {
>        0: 'spam',
>        1: 'eggs',
>        2: 'beans',
>        }
>
>because that makes it clear that *all* the indented lines are a
>continuation of the same statement, just like a suite of statements
>are all uniformly indented under (e.g.) a function definition.

Ditto
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From rantingrick at gmail.com  Sun Feb  1 14:00:40 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 1 Feb 2009 11:00:40 -0800 (PST)
Subject: Pipe stdout && stderr to a TkLabel widget
References: <3022e071-aaf9-4169-b394-c8b311d05d09@41g2000yqf.googlegroups.com>
	<b23be880-de2b-4f95-8f4f-9fa85b8fd057@h20g2000yqn.googlegroups.com> 
	<bc163bd7-bd2c-4a20-8e91-dbe3475116df@e24g2000vbe.googlegroups.com>
Message-ID: <f2ee7867-8cc7-484f-9a3c-579b619b0e56@d36g2000prf.googlegroups.com>

PS:

The braces are there because i used *arg in the fuction, so that is
not a problem now. All i want to do is overide the print statement to
sent all it's output to a Tkinter Label widget

Thanks


From rdmurray at bitdance.com  Sun Feb  1 14:02:57 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 19:02:57 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <gm4rl1$21r$1@ger.gmane.org>

Quoth thmpsn.m.k at gmail.com:
> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

You, sir, should be programming in some language other than Python.

--RDM



From berankin99 at yahoo.com  Sun Feb  1 14:06:26 2009
From: berankin99 at yahoo.com (Bernard Rankin)
Date: Sun, 1 Feb 2009 11:06:26 -0800 (PST)
Subject: error on building 2.6.1. (_ctypes)
References: <852876.9144.qm@web112210.mail.gq1.yahoo.com>
	<op.uojy1o1gx6zn5v@gabriel2.softlabbsas.com.ar>
	<296542.92832.qm@web112216.mail.gq1.yahoo.com>
	<op.uolzwepsx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <808820.1690.qm@web112216.mail.gq1.yahoo.com>




> 
> >> > I am trying to build python 2.6 on a machine (web server) that I do not 
> have
> >> root access to. (has 2.4 installed)
> >> >
> >> > Python 2.5 builds fine, but I am getting an error when I run "make" for 
> 2.6.1.
> 
> >> Mmm... my 2.6.1 source show different line numbers, maybe you should check 
> it's
> >> the right file?
> > 
> > Wow, good catch.
> > 
> > I just re-downloaded the archive and it works fine.
> > 
> > I know for certain that I did no editing to the files, and even tried 
> expanding the original tar.gz a couple of times.
> > 
> > There must be a corrupted package somewhere among the official Python 
> mirrors.  (Sadly, I overwrote the old tar.gz file when I got the new one.)
> 
> Oops... so bad. The python.org releases have PGP signatures and MD5 published so 
> you can verify their authenticity.
> 

Yeah, I did that on the new archive. :)


      



From ppearson at nowhere.invalid  Sun Feb  1 14:11:39 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 1 Feb 2009 19:11:39 GMT
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com>
	<gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au>
	<mailman.8504.1233466604.3487.python-list@python.org>
Message-ID: <6umafaFg436kU1@mid.individual.net>

On Sun, 1 Feb 2009 15:36:43 +1000, Tim Roberts <t.roberts at cqu.edu.au> wrote:
>
> Actually, all I'm interested in is whether the 100 digit
> numbers have an exact integral root, or not.  At the
> moment, because of accuracy concerns, I'm doing something
> like
>  
>                     for root in powersp:
>                             nroot = round(bignum**(1.0/root))
>                             if bignum==long(nroot)**root:
>                                                              .........
> which is probably very inefficient, but I can't see anything better.....

You've gotten several promising leads on this thread, but
here's one more thing that might help.  Note that if 
c == b**13, then c%p == pow( b%p, 13, p ) for any prime p.
So if you have a 100-digit c and a "candidate" 13-th root b,
and you choose p = 101 (for example), a false b has only a 1%
chance of passing the c%p == pow( b%p, 13, p ) test, which
might save some fraction of the cost of whatever more
rigorous test you subsequently apply.

-- 
To email me, substitute nowhere->spamcop, invalid->net.


From vicente.soler at gmail.com  Sun Feb  1 14:18:01 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 11:18:01 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org>
Message-ID: <e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com>

On 1 feb, 19:02, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Sun, Feb 1, 2009 at 9:24 AM, vsoler<vicente.soler at gmail.com>wrote:Hi,
> My foo.txt file contains the following:
> 1,"house","2,5"
> 2,"table","6,7"
> 3,"chair","-4,5"
> ... as seen with notepad.
> This file was created with the OpenOffice Calc spreadsheet, but since
> I use comma as the decimal separator for numbers, the last value in
> each line appears sorrounded by quotes.
> I would like to obtain:
> [[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]
> If I read your requirements, right, I think you want:import csv
> data = []
> reader = csv.reader(open("filename", "r"))
> for line in reader:
> ???? data.append(
> ???????? line[0], line[1], float(line[2].replace(",", "."))
> ???? )
> print data
> Although you may want to replace that last bit with
> ??? decimal.Decimal(line[2].replace(",","."))
> If you want an exact result and not the approximate floating point result.
> Basically the csv module can read through the CSV file very easily, but because you're using commas instead of points you just have to edit that out before you convert it to a number.
> --S
>
> ?signature.asc
> < 1 KBVerDescargar

with small modifications, your answers work perfectly!!!

r: in the open statement, why do you use 'rb' as 2nd argument? b is
supposed to be binary, and my file is text!
Steve: your idea works
Stephen: I got an error message saying that append can only take one
argument while you add three; I have added [ ] around the three
arguments; now it's fine; I've also added int() around first argument
to turn it into an integer.

Thank you all indeed!


From aaron.watters at gmail.com  Sun Feb  1 14:18:14 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Sun, 1 Feb 2009 11:18:14 -0800 (PST)
Subject: search speed
References: <4e53a2a6-058f-4265-a4d6-5565e2fec2c3@v39g2000pro.googlegroups.com>
	<6uft9aFf9kgbU1@mid.uni-berlin.de>
Message-ID: <8a972421-cba3-4394-8651-c81fce1083da@i18g2000prf.googlegroups.com>

On Jan 30, 3:49?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> alex23 gave you a set of tools that you can use for full-text-search.
> However, that's not necessarily the best thing to do if things have a
> record-like structure.

In Nucular (and others I think) you can do searches
for terms anywhere (full text)
searches for terms within fields, searches for prefixes in fields,
searches
based on field inequality, or searches for field exact value.  I would
argue this subsumes the standard "fielded approach".
   -- Aaron Watters
===
Oh, I'm a lumberjack and I'm O.K...



From steve at holdenweb.com  Sun Feb  1 14:19:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 14:19:55 -0500
Subject: getting values from a text file (newby)
In-Reply-To: <fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>
References: <b309b60b-2dbd-4ff9-8617-396f8095bc2c@x14g2000yqk.googlegroups.com>
	<fqo0tax4nofuhytdg1UYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm4skr$5do$1@ger.gmane.org>

Stephen Hansen wrote:
> 
> 
> On Sun, Feb 1, 2009 at 9:24 AM, vsoler <vicente.soler at gmail.com> wrote:
> 
>     Hi,
> 
>     My foo.txt file contains the following:
> 
>     1,"house","2,5"
>     2,"table","6,7"
>     3,"chair","-4,5"
> 
>     ... as seen with notepad.
> 
>     This file was created with the OpenOffice Calc spreadsheet, but since
>     I use comma as the decimal separator for numbers, the last value in
>     each line appears sorrounded by quotes.
> 
>     I would like to obtain:
> 
>     [[1,"house",2.5], [2,"table",6.7], [3,"chair",-4.5]]
> 
> 
> If I read your requirements, right, I think you want:
> 
> import csv
> 
> data = []
> 
> reader = csv.reader(open("filename", "r"))
> for line in reader:
>      data.append(
>          line[0], line[1], float(line[2].replace(",", "."))
>      )
> 
> print data
> 
> Although you may want to replace that last bit with
>     decimal.Decimal(line[2].replace(",","."))
> 
> If you want an exact result and not the approximate floating point result.
> 
> Basically the csv module can read through the CSV file very easily, but
> because you're using commas instead of points you just have to edit that
> out before you convert it to a number.
> 
alternatively look at locale.atof() to convert according to what I
presume are the conventions of your locale ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Sun Feb  1 14:33:28 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 19:33:28 +0000 (UTC)
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
References: <gm4fcr$tr7$1@online.de>
Message-ID: <gm4te8$79g$1@ger.gmane.org>

Quoth Christoph Zwerschke <cito at online.de>:
> What actually happens is the following:
> 
> * BaseHTTPServer binds only to the IPv4 address of localhost, because
>    it's based on TCPServer which has address_family=AF_INET by default.
> 
> * HTTPConnection.connect() however tries to connect to all IP addresses
>    of localhost, in the order determined socket.getaddrinfo('localhost').
> 
>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>    first, then the IPv4 address. Since the IPv6 address is checked first,
>    this gives a timeout and causes the slow connect() call. The order by
>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>    on the glibc version, so it may be a problem on other platforms, too.

Based on something I read in another thread, this appears to be a problem
only under Windows.  Everybody else implemented the TCP/IP stack according
to spec, and the IPV6 connect attempt times out immediately, producing
no slowdown.

Microsoft, however....

--RDM



From matt.dubins at sympatico.ca  Sun Feb  1 14:54:09 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Sun, 1 Feb 2009 11:54:09 -0800 (PST)
Subject: Membership of multiple items to a list
Message-ID: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>

Dear all,

I'd like to know how to elegantly check a list for the membership of
any of its items to another list.  Not caring for elegance, I would
use the following code:

blah = [1,2,3]
yadda = [3,4,5,6]

blah[0] or blah[1] or blah[2] in yadda

Please tell me how to change the preceding code into something nicer
where I don't have to keep extending the line based on the length of
the first list.

Cheers,
Matt Dubins


From gbofspam at gmail.com  Sun Feb  1 15:00:36 2009
From: gbofspam at gmail.com (Andrew Parker)
Date: Sun, 1 Feb 2009 15:00:36 -0500
Subject: subprocess.Popen not creating a pipe
In-Reply-To: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
References: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
Message-ID: <6c3f5e6c0902011200s47372b8g49c794b7fa62a06b@mail.gmail.com>

On Sun, Feb 1, 2009 at 1:46 PM, Andrew Parker <gbofspam at gmail.com> wrote:
> I'm having some fun with Popen.  I have the following line:
>
>    process = subprocess.Popen(command, stdout=subprocess.PIPE,
> stderr=subprocess.STDOUT)
>    print process.stdout
>
> Under normal circumstances, this displays:
>
>    <open file '<stdout>', mode 'w' at 0xb7f8e068>
>
> However, I have a binary that I use to kick off this script, and when
> that runs, it displays:
>
>    None
>
> So, two questions:
>
>    1.  What the heck is this binary doing that upsets Popen so much?
>    2.  What can *my script* do to get around this problem.
>
> Unfortunately I'm stuck using this binary, so its the python where I
> have to solve this.
>
> Any ideas?
>

so, tracing through subprocess.Popen, I see that os.pipe() is being
invoked for stdout.  This is returning (0, 3), and I assume the 0 is
conflicting with what python is assuming is stdin.  Calling pipe()
before Popen gets around my problem, as the pipe the Popen gets then
returns (4,5) which Popen seems happy with.

Sounds like a bug.  Should I report this, or is it expected/known behaviour?


From http  Sun Feb  1 15:00:51 2009
From: http (Paul Rubin)
Date: 01 Feb 2009 12:00:51 -0800
Subject: Membership of multiple items to a list
References: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <7x63junczw.fsf@ruckus.brouhaha.com>

inkhorn <matt.dubins at sympatico.ca> writes:
> blah = [1,2,3]
> yadda = [3,4,5,6]
> 
> blah[0] or blah[1] or blah[2] in yadda

if set(blah) & set(yadda): print "yes"


From lists at cheimes.de  Sun Feb  1 15:00:55 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 01 Feb 2009 21:00:55 +0100
Subject: Membership of multiple items to a list
In-Reply-To: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
References: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <gm4v1m$bt4$1@ger.gmane.org>

inkhorn schrieb:
> Dear all,
> 
> I'd like to know how to elegantly check a list for the membership of
> any of its items to another list.  Not caring for elegance, I would
> use the following code:
> 
> blah = [1,2,3]
> yadda = [3,4,5,6]
> 
> blah[0] or blah[1] or blah[2] in yadda
> 
> Please tell me how to change the preceding code into something nicer
> where I don't have to keep extending the line based on the length of
> the first list.

You can and should use Python's set type for membership testing.

>>> blah = set([1,2,3])
>>> yadda = set([3,4,5,6])
>>> blah.issubset(yadda)
False
>>> blah.difference(yadda)
set([1, 2])
>>> blah.symmetric_difference(yadda)
set([1, 2, 4, 5, 6])

Christian



From apt.shansen at gmail.com  Sun Feb  1 15:01:11 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 12:01:11 -0800 (PST)
Subject: Membership of multiple items to a list
In-Reply-To: <dd2646f2-820f-4990-9fcd-d74a4fad701f@x16g2000prn.googlegroups.com>
Message-ID: <fqo51sdyacxjjl9locUYAxe124vaj_firegpg@mail.gmail.com>

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From matt.dubins at sympatico.ca  Sun Feb  1 15:06:54 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Sun, 1 Feb 2009 12:06:54 -0800 (PST)
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
Message-ID: <a685967a-db1c-447e-bce2-37f2d562659d@v5g2000pre.googlegroups.com>

Wow thanks for the lightning fast reply!  This does exactly the right
job.

Matt

On Feb 1, 3:01?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> I'd like to know how to elegantly check a list for the membership of
> any of its items to another list. ?Not caring for elegance, I would
> use the following code:
> That's one of the useful properties of sets:
> >>> a = [1,2,3]
> >>> b = [3,4,5,6]
> >>> set(a) & set(b)
> set([3])
> >>> set(a).intersection(b)
> set([3])
> That's two spellings of the same thing. As for testing: an empty set like an empty list will return false, so "if set(a) & set(b):" will be true or false based on if there's any commonalities between the two lists.
> --Stephen
>
> ?signature.asc
> < 1KViewDownload



From ianand0204 at gmail.com  Sun Feb  1 15:35:47 2009
From: ianand0204 at gmail.com (flagg)
Date: Sun, 1 Feb 2009 12:35:47 -0800 (PST)
Subject: SimpleXMLRPCServer question
References: <0ddb9364-02c9-4c52-aadb-e9d9b2d06b20@e1g2000pra.googlegroups.com><mailman.8423.1233375172.3487.python-list@python.org>
	<185b44c2-fc78-480f-8eb1-6395f7fe7ad7@x6g2000pre.googlegroups.com> 
	<mailman.8514.1233479578.3487.python-list@python.org>
Message-ID: <542076e8-2585-4be1-a553-43dc674e02a4@a12g2000pro.googlegroups.com>

On Feb 1, 12:38?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> ?"flagg" <iana..... at gmail.com> wrote:
> >Let me see if i can elaborate on the requirements. ?I have 20+
> >different zone files. ?I want the xmlrpc server to be able to
> >determine what zone file to open by looking at the incoming xml
> >request. ?For example one of the functions I have now is to show a DNS
> >record (I am using dnspython for most of this work)
>
> This is a wrong move, it is too magical - see below
>
> >If i send an xmlrpc request that uses the 'showRecord' function with
> >params of 'oracle1.foo.bar.com' ?I want to parse the "params" piece
> >and then instruct the xml-rpc server to open foo.bar.com.zone for
> >reading. ?The reason why i was looking at do_Post() and _dispatch was
> >to attempt to read the incoming params and do exactly that.
>
> >Do you think there is an easier way of accomplishing this, than the
> >way I am going about it?
>
> Yes I do.
>
> Why don't you split the functionality into two bits - exactly as if you were
> doing
> it locally:
>
> - OpenTheThing(whatOrWhere)
> - ReadTheRecordAndShowIt(PossiblyWhichRecord)
>
> If it's a remote database you are accessing, then you may need even more
> steps, like first doing some select, or whatever - I would get it running
> locally, calling local functions directly on the server, and then make them
> remote xmlrpc proxy functions, after it's all working.
>
> If you are getting the request from some user input, you can either change
> the way you ask the questions, or you do the parsing at point of origen, to
> determine what to call, in which sequence.
>
> - Hendrik

Actually I have it working as local functions, its wrapping those
local functions up in a way that makes sense that is throwing me off.
Your suggestion of making two functions one for opening the file and
one for showing records makes sense.   I will give it a shot


From mensanator at aol.com  Sun Feb  1 16:04:02 2009
From: mensanator at aol.com (Mensanator)
Date: Sun, 1 Feb 2009 13:04:02 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
Message-ID: <44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com>

On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
> On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > which is probably very inefficient, but I can't see anything better.....
>
> > Tim
>
> Take a look at gmpy and the is_power function. I think it will do
> exactly what you want.

And the root function will give you the root AND tell you whether
it was an integral root:

>>> gmpy.root(a,13)
(mpz(3221), 0)

In this case, it wasn't.

>
> http://code.google.com/p/gmpy/
>
> casevh



From cito at online.de  Sun Feb  1 17:44:11 2009
From: cito at online.de (Christoph Zwerschke)
Date: Sun, 01 Feb 2009 23:44:11 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <mailman.8540.1233516823.3487.python-list@python.org>
References: <gm4fcr$tr7$1@online.de>
	<mailman.8540.1233516823.3487.python-list@python.org>
Message-ID: <gm58jn$nu3$1@online.de>

rdmurray at bitdance.com schrieb:
> Quoth Christoph Zwerschke <cito at online.de>:
>>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>>    first, then the IPv4 address. Since the IPv6 address is checked first,
>>    this gives a timeout and causes the slow connect() call. The order by
>>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>>    on the glibc version, so it may be a problem on other platforms, too.
> 
> Based on something I read in another thread, this appears to be a problem
> only under Windows.  Everybody else implemented the TCP/IP stack according
> to spec, and the IPV6 connect attempt times out immediately, producing
> no slowdown.
> 
> Microsoft, however....

The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
returns IPv6 addresses first is not wrong in itself.

For this discussion, see also
http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
https://bugzilla.redhat.com/show_bug.cgi?id=190495

But yes, I also wonder why the connect to the IPv6 loopback address does 
not time out more quickly on Windows.

-- Christoph


From stef.mientki at gmail.com  Sun Feb  1 17:56:28 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 01 Feb 2009 23:56:28 +0100
Subject: database wrapper ?
Message-ID: <4986289C.3030205@gmail.com>

hello,

Until now I used a simple wrapper around pysqlite and pyodbc to manage 
my databases.
Now I'm looking for a better solution,
because I've to support a (for this moment) unknown database,
and I'm not the one who will choose the database.

Googling, I found SQLalchemy,
which looks quit good.

But as I only want to choose once,
I googled for  "SQLalchemy alternatives",
but it didn't find many answers.
(Storm / Grok are of no interest, because manipulating the structure of 
the database is a key issue).

Is SQLalchemy the best / most popular database wrapper ?
Are there any alternatives ?

I don't know if it matters:
but for the short term it's only for desktop applications,
but in the future I'll certainly want to move to web based databases.

thanks,
Stef



From sjmachin at lexicon.net  Sun Feb  1 17:57:39 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 14:57:39 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com>
Message-ID: <e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com>

On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
> r: in the open statement, why do you use 'rb' as 2nd argument? b is
> supposed to be binary, and my file is text!

Because unlike Stephen, r has read the csv manual. Binary mode is
required to handle properly cases like '\n' embedded in a field --
something which can easily happen when the data has been extracted
from a database with slack data-entry validation.


From vicente.soler at gmail.com  Sun Feb  1 18:18:50 2009
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 1 Feb 2009 15:18:50 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com> 
	<e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com>
Message-ID: <fe74d94e-c100-4e45-a6f8-88d886f32ccc@r10g2000prf.googlegroups.com>

On 1 feb, 23:57, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
>
>
> > r: in the open statement, why do you use 'rb' as 2nd argument? b is
> > supposed to be binary, and my file is text!
>
> Because unlike Stephen, r has read the csv manual. Binary mode is
> required to handle properly cases like '\n' embedded in a field --
> something which can easily happen when the data has been extracted
> from a database with slack data-entry validation.

Where can I get the csv manual?


From rdmurray at bitdance.com  Sun Feb  1 18:26:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sun, 1 Feb 2009 23:26:07 +0000 (UTC)
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
References: <gm4fcr$tr7$1@online.de>
	<mailman.8540.1233516823.3487.python-list@python.org>
	<gm58jn$nu3$1@online.de>
Message-ID: <gm5b2f$dcp$1@ger.gmane.org>

Quoth Christoph Zwerschke <cito at online.de>:
> rdmurray at bitdance.com schrieb:
> > Quoth Christoph Zwerschke <cito at online.de>:
> >>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
> >>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
> >>    first, then the IPv4 address. Since the IPv6 address is checked first,
> >>    this gives a timeout and causes the slow connect() call. The order by
> >>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
> >>    on the glibc version, so it may be a problem on other platforms, too.
> > 
> > Based on something I read in another thread, this appears to be a problem
> > only under Windows.  Everybody else implemented the TCP/IP stack according
> > to spec, and the IPV6 connect attempt times out immediately, producing
> > no slowdown.
> > 
> > Microsoft, however....
> 
> The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
> written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
> returns IPv6 addresses first is not wrong in itself.
> 
> For this discussion, see also
> http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
> https://bugzilla.redhat.com/show_bug.cgi?id=190495
> 
> But yes, I also wonder why the connect to the IPv6 loopback address does 
> not time out more quickly on Windows.

Right, it's not the order of the returned items that's the Microsoft
weirdness, it's the long timeout on an attempt to connect to something
that doesn't exist.  There was a long discussion about this, and it might
even have been on python-dev, but I can't lay my hands on the thread.
In short, Microsoft retries and waits a while when the far end says
"no thanks" to a connection attempt, instead of immediately returning
the connection failure the way Linux and etc and etc do.  This applies
to IPV4, too.

--RDM



From rhodri at wildebst.demon.co.uk  Sun Feb  1 18:39:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 01 Feb 2009 23:39:14 -0000
Subject: is python Object oriented??
In-Reply-To: <4985DC6F.4030106@holdenweb.com>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
	<4985DC6F.4030106@holdenweb.com>
Message-ID: <op.uoo5boxta8ncjz@gnudebst>

On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Stephen Hansen wrote:
>> [...]
>> don't play with anyone else's
>> privates.
>>
> A good rule in life as well as programming.

Unless, of course, you're both consenting adults.

What?  Someone had to say it!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From aahz at pythoncraft.com  Sun Feb  1 18:42:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 15:42:00 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
Message-ID: <gm5c08$386$1@panix3.panix.com>

In article <e85efc5f-d141-4c5a-b228-8dba960a6838 at l33g2000pri.googlegroups.com>,
MattBD  <matthewbdaly at googlemail.com> wrote:
>
>I like Vim, that works really well for me when coding in Python.
>Enable syntax highlighting and it's a great development environment.
>It's a little tough at first but run vimtutor and you'll soon start to
>get the hang of it.

Just to register a contrary opinion: I *hate* syntax highlighting
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From clp2 at rebertia.com  Sun Feb  1 18:43:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 15:43:50 -0800
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
References: <4986289C.3030205@gmail.com>
Message-ID: <50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>

On Sun, Feb 1, 2009 at 2:56 PM, Stef Mientki <stef.mientki at gmail.com> wrote:
> hello,
>
> Until now I used a simple wrapper around pysqlite and pyodbc to manage my
> databases.
> Now I'm looking for a better solution,
> because I've to support a (for this moment) unknown database,
> and I'm not the one who will choose the database.
>
> Googling, I found SQLalchemy,
> which looks quit good.
>
> But as I only want to choose once,
> I googled for  "SQLalchemy alternatives",
> but it didn't find many answers.
> (Storm / Grok are of no interest, because manipulating the structure of the
> database is a key issue).
>
> Is SQLalchemy the best / most popular database wrapper ?
> Are there any alternatives ?

SQLObject is also probably worth looking at -- http://www.sqlobject.org/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From aahz at pythoncraft.com  Sun Feb  1 18:45:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 1 Feb 2009 15:45:10 -0800
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
Message-ID: <gm5c66$1ve$1@panix3.panix.com>

In article <387f23cd-90e2-46fc-8c91-1c2f6b31c89e at u13g2000yqg.googlegroups.com>,
andrew cooke  <andrew at acooke.org> wrote:
>
>However, i am thinking I could really do with:
>- a mailing list
>- simple bug tracking
>- subversion
>and am wondering which is the best (free) provider for these (the code
>is LGPL open source).  I'd prefer a mailing list to something like
>google groups (although I guess it may be possible to configure a
>gateway) and I could open up my personal subversion server, but that
>seems like a lot of work (not really that interested in moving to
>something other than svn).

Note that it's fairly easy to get a new list hosted at python.org, just
ask postmaster.  I for one won't participate in any list hosted on
Google because of the need for a Google login.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From apt.shansen at gmail.com  Sun Feb  1 18:47:23 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 15:47:23 -0800 (PST)
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
Message-ID: <fqod4okvt27yodafdrUYAxe124vaj_firegpg@mail.gmail.com>

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From bignose+hates-spam at benfinney.id.au  Sun Feb  1 18:55:50 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 10:55:50 +1100
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <87hc3d3e61.fsf@benfinney.id.au>

Stef Mientki <stef.mientki at gmail.com> writes:

> Is SQLalchemy the best / most popular database wrapper ?

In my opinion, yes it's the best. It gives a good ORM (letting you
treat your data as objects and have them persistently stored in the
database), while still allowing all the power and flexibility of full
SQL whenever you need it; and a continuum of options in between (e.g.
a helpful query builder toolkit).

-- 
 \       ?We must respect the other fellow's religion, but only in the |
  `\       sense and to the extent that we respect his theory that his |
_o__)     wife is beautiful and his children smart.? ?Henry L. Mencken |
Ben Finney


From andrew at acooke.org  Sun Feb  1 18:58:26 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 15:58:26 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <e3582a01-57a4-4e75-8dac-fc0dea248fc3@k19g2000yqg.googlegroups.com>

> Is SQLalchemy the best / most popular database wrapper ?

SQLAlchemy is the best SQL library I have ever used.

But it may depend on who you ask.  For me, what makes SQLAlchemy so
good is the way it allows you to use SQL from within Python.  I have
used the ORM side, and that's fine, but it's the way that it doesn't
get in the way of "just" SQL that make it so good.  If I had to choose
a second reason why it's so good it would be the way it emphasises
metadata - it will use table definitions from the database, and it
will let you define schema yourself (in fact, it's an excellent way of
defining complex schema in a platform-independent fashion).

The main drawback is that it is rather complex.  If something doesn't
work, it can be tricky to work out why.  On the other hand, the
documentation is good, and the support (on google groups) is good too
(a developer always replies within 24 hours in my experience).

It does expect you to know SQL - it doesn't try to hide SQL at all.
Whether that is good or bad depends on your POV I guess.

I wish all DB solutions were like this - my hope is that EmpireDB will
do the same for Java, but it's too early to tell...

Andrew


From andrew at acooke.org  Sun Feb  1 19:02:52 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 16:02:52 -0800 (PST)
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
Message-ID: <952e4cda-e2a5-4395-8ac3-6b64aa3c5af0@e3g2000vbe.googlegroups.com>

On Feb 1, 8:45?pm, a... at pythoncraft.com (Aahz) wrote:
> Note that it's fairly easy to get a new list hosted at python.org, just
> ask postmaster. ?I for one won't participate in any list hosted on
> Google because of the need for a Google login.

ah well - i guess you can use pyparsing ;o)

http://code.google.com/p/lepl/

andrew


From gdamjan at gmail.com  Sun Feb  1 19:15:39 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 01:15:39 +0100
Subject: Using lxml to screen scrap a site, problem with charset
Message-ID: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>

So, I'm using lxml to screen scrap a site that uses the cyrillic 
alphabet (windows-1251 encoding). The sites HTML doesn't have the <META 
..content-type.. charset=..> header, but does have a HTTP header that 
specifies the charset... so they are standards compliant enough.

Now when I run this code:

from lxml import html
doc = html.parse('http://a1.com.mk/')
root = doc.getroot()
title = root.cssselect(('head title'))[0]
print title.text

the title.text is ? unicode string, but it has been wrongly decoded as 
latin1 -> unicode

So.. is this a deficiency/bug in lxml or I'm doing something wrong.
Also, what are my other options here?


I'm running Python 2.6.1 and python-lxml 2.1.4 on Linux if matters.

-- 
?????? ( http://softver.org.mk/damjan/ )

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan




From bignose+hates-spam at benfinney.id.au  Sun Feb  1 19:26:24 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 11:26:24 +1100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <874ozd3cr3.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> Just to register a contrary opinion: I *hate* syntax highlighting

On what basis?

-- 
 \       ?The man who is denied the opportunity of taking decisions of |
  `\      importance begins to regard as important the decisions he is |
_o__)                        allowed to take.? ?C. Northcote Parkinson |
Ben Finney


From andrew at acooke.org  Sun Feb  1 19:28:53 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 1 Feb 2009 16:28:53 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org> 
	<e3582a01-57a4-4e75-8dac-fc0dea248fc3@k19g2000yqg.googlegroups.com>
Message-ID: <7bdf4281-0f10-48ac-bf96-b91c481412b8@f33g2000vbf.googlegroups.com>


> I wish all DB solutions were like this - my hope is that EmpireDB will
> do the same for Java, but it's too early to tell...

Hmmm - I should correct the above.  I had assumed EmpireDB was new,
because it's an Apache Incubator project, but now I look at their site
I see it's actually been around for years.  I need to try it out...

Sorry about the error,
Andrew


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 19:31:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 00:31:38 GMT
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 12:01:11 -0800, Stephen Hansen wrote:

> <br><div class="gmail_quote"><blockquote class="gmail_quote"
> style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
> 0.8ex; padding-left: 1ex;"><br> I'd like to know how to elegantly check
> a list for the membership of<br> any of its items to another list.
> &nbsp;Not caring for elegance, I would<br> use the following code:<br>
> </blockquote><div><br>That's one of the useful properties of
> sets:<br><br>&gt;&gt;&gt; a = [1,2,3]<br>&gt;&gt;&gt; b =
> [3,4,5,6]<br>&gt;&gt;&gt; set(a) &amp;
> set(b)<br>set([3])<br>&gt;&gt;&gt;
> set(a).intersection(b)<br>set([3])<br> <br>That's two spellings of the
> same thing. As for testing: an empty set like an empty list will return
> false, so "if set(a) &amp; set(b):" will be true or false based on if
> there's any commonalities between the two
> lists.<br><br>--Stephen</div></div><br>


Stephen, do you see the utter mess your posts look like to some others?

Please ensure you send plain text messages to Usenet, not HTML. If you 
absolutely can't avoid using an insecure and bloated page layout language 
instead of text, please ensure that your News or mail client is set to 
send plain text as well as HTML.

If your news/mail client doesn't follow Usenet standards, then (1) change 
the application you use to one that does; or (2) complain to the vendor 
until they fix their product.


Thank you,



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 20:00:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 01:00:18 GMT
Subject: is python Object oriented??
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>
	<mailman.8532.1233509503.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:

> I think it's noticeable that the people who have been arguing against
> what I might tipify as this "libertarian view" are those for whom the
> consequences of programming error are serious to extreme.
...
> Just the same, it still doesn't save them from the consequences of
> interface miscommunication, as int he case of the Mars lander that
> crashed because one module provided a (probably strongly-typed) value in
> meters, and the recipient interpreted it as (probably strongly-typed)
> feet, cutting the engine out too early.

Of course. Nor will data hiding prevent off-by-one errors, or errors of 
logic, or data corruption, or stray cosmic rays flipping bits in memory. 
But it will prevent *some* errors. It's one tool in an entire toolbox for 
writing correct code, not a magic bullet.

Python already has enforced data hiding, but only for built-ins. 
Consequently, anyone who uses a list can absolutely, categorically trust 
that len(alist) will return the actual length of alist, and not some 
mangled value stuffed into alist by some arbitrary piece of code 
somewhere else.

(For those unaware, in CPython lists are arrays. They store the current 
length as a private value inaccessible to Python code.)

Short of cosmic rays flipping bits, any built-in list you receive from 
anywhere is going to have a valid length, and no pure-Python code can 
make it invalid. To read some of the posts in this thread, one would be 
forgiven for thinking that this most be a disaster of the highest 
consequences, unPythonic to the extreme, an example of unfree B&D 
programming so unpleasant to work with that people hate every second of 
it.

Except of course it isn't. Nobody sensibly complains that they can't 
mangle the length of a list, or move keys around inside dicts, or 
whatever. This data hiding is a good thing.

All I want is the ability to do with Python classes what I can do with C 
extension types. I don't think that's an *unreasonable* ask, even if it 
is *unpractical* given the current design of Python.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Sun Feb  1 20:06:53 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 02 Feb 2009 01:06:53 GMT
Subject: accessing elements of a tuple
References: <f257b9ab0901301420k28bd46feq6c7071f0fa6e6abb@mail.gmail.com>
	<f257b9ab0901301423h4e637f71m290590cb23c19c09@mail.gmail.com>
	<mailman.8407.1233354867.3487.python-list@python.org>
	<0195522e$0$31512$c3e8da3@news.astraweb.com>
	<mailman.8524.1233498768.3487.python-list@python.org>
Message-ID: <pan.2009.02.02.01.06.55@REMOVE.THIS.cybersource.com.au>

On Sun, 01 Feb 2009 09:32:42 -0500, D'Arcy J.M. Cain wrote:

> On Sun, 01 Feb 2009 19:23:58 +1100
> Steven D'Aprano <steve at pearwood.info> wrote:
>> D'Arcy J.M. Cain wrote:
>> 
>> > First of all, list is a reserved word. ?Don't use it as a variable
>> > name.
>> 
>> Unless you mean to. Shadowing built-ins is only a bad thing when you do
>> it by accident.
> 
> I suppose but I am having a hard time trying to think of some good
> reason to replace a builtin function that creates a list with a list
> object.
> 
>>>> list = list((1,2,3))
>>>> list((1,2,3))
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: 'list' object is not callable


There may not be a positive reason in favour of it, but in a small 
function that doesn't call list() and never will, there's no reason 
*against* using the name 'list'. Sometimes generic names like 'list' (or 
if you prefer, 'alist') are sensible, and in those cases, shadowing the 
list built-in may be a matter of taste.

I personally don't like it, but some people obviously do.



-- 
Steven


From clp2 at rebertia.com  Sun Feb  1 20:19:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 17:19:39 -0800
Subject: question about Z=[[x for y in range(1,
	2) if AList[x]==y] for x in range(0,5)]
In-Reply-To: <77e831100901301733s4ebe3ca7i251a79955894f00e@mail.gmail.com>
References: <77e831100901301733s4ebe3ca7i251a79955894f00e@mail.gmail.com>
Message-ID: <50697b2c0902011719p6fa50076yd79d2fc3dce8771e@mail.gmail.com>

On Fri, Jan 30, 2009 at 5:33 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Z=[[x for y in range(1,2) if AList[x]==y] for x in range(0,5)]
> I am not sure how to ask this but which "for" is looped first? I could
> test but was wondering if there was a nice explanation I could apply
> to future situations.

The outer one. Remember that you can always rewrite (a) list
comprehension(s) into (an) equivalent for-loop(s). In this case:
Z = []
for x in range(0,5):
    _tmp = []
    for y in range(1,2):
        if AList[x]==y:
            _tmp.append(x)
    Z.append(_tmp)

Or alternatively, imagine if the inner list comprehension was instead
a function call:

#assuming AList is a global var
def inner_list_comp(x):
    return [x for y in range(1,2) if AList[x]==y]

Z=[inner_list_comp(x) for x in range(0,5)]

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From kyrie at uh.cu  Sun Feb  1 20:46:41 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 1 Feb 2009 20:46:41 -0500
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<mailman.8532.1233509503.3487.python-list@python.org>
	<pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
Message-ID: <200902012046.41286.kyrie@uh.cu>

On Sunday 01 February 2009 08:00:18 pm Steven D'Aprano wrote:
> On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:

> Except of course it isn't. Nobody sensibly complains that they can't 
> mangle the length of a list, or move keys around inside dicts, or 
> whatever. This data hiding is a good thing.

If lists and dictionaries were not C types, and python didn't have to shield 
us from the mess that is C and its pointers, that enforcement may not be such 
a good thing. And, while we are at it, that is not python having "selective" 
enforcement of data hiding but only for C, that's C/C++ having data hiding 
and not exporting the attributes back to python.

> All I want is the ability to do with Python classes what I can do with C
> extension types. I don't think that's an *unreasonable* ask, even if it
> is *unpractical* given the current design of Python.

Well, then. Do you want dynamic checks? Go fix Bastion/rexec (that would be a 
_good_ thing, valuable for way more than data hiding). Or do you want static 
checks? In that case, you have it already.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From steve at holdenweb.com  Sun Feb  1 20:49:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 20:49:20 -0500
Subject: is python Object oriented??
In-Reply-To: <op.uoo5boxta8ncjz@gnudebst>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<4985DC6F.4030106@holdenweb.com>
	<op.uoo5boxta8ncjz@gnudebst>
Message-ID: <gm5jf0$v1i$1@ger.gmane.org>

Rhodri James wrote:
> On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com>
> wrote:
> 
>> Stephen Hansen wrote:
>>> [...]
>>> don't play with anyone else's
>>> privates.
>>>
>> A good rule in life as well as programming.
> 
> Unless, of course, you're both consenting adults.
> 
> What?  Someone had to say it!
> 
Nearly included it myself, but decided not to deny someone else the
simple pleasure of posting it :)

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 20:53:55 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 20:53:55 -0500
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<mailman.8532.1233509503.3487.python-list@python.org>
	<pan.2009.02.02.01.00.19@REMOVE.THIS.cybersource.com.au>
Message-ID: <gm5jnk$vmg$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Sun, 01 Feb 2009 12:31:27 -0500, Steve Holden wrote:
> 
>> I think it's noticeable that the people who have been arguing against
>> what I might tipify as this "libertarian view" are those for whom the
>> consequences of programming error are serious to extreme.
> ...
>> Just the same, it still doesn't save them from the consequences of
>> interface miscommunication, as int he case of the Mars lander that
>> crashed because one module provided a (probably strongly-typed) value in
>> meters, and the recipient interpreted it as (probably strongly-typed)
>> feet, cutting the engine out too early.
> 
> Of course. Nor will data hiding prevent off-by-one errors, or errors of 
> logic, or data corruption, or stray cosmic rays flipping bits in memory. 
> But it will prevent *some* errors. It's one tool in an entire toolbox for 
> writing correct code, not a magic bullet.
> 
> Python already has enforced data hiding, but only for built-ins. 
> Consequently, anyone who uses a list can absolutely, categorically trust 
> that len(alist) will return the actual length of alist, and not some 
> mangled value stuffed into alist by some arbitrary piece of code 
> somewhere else.
> 
Unless, of course, some piece of code masks (or worse still, replaces)
the len() function in __builtins__ with one of their own. There's no
such thing as a foolproof system. The minute you think you have one the
world comes up with a superior class of fool.

> (For those unaware, in CPython lists are arrays. They store the current 
> length as a private value inaccessible to Python code.)
> 
> Short of cosmic rays flipping bits, any built-in list you receive from 
> anywhere is going to have a valid length, and no pure-Python code can 
> make it invalid. To read some of the posts in this thread, one would be 
> forgiven for thinking that this most be a disaster of the highest 
> consequences, unPythonic to the extreme, an example of unfree B&D 
> programming so unpleasant to work with that people hate every second of 
> it.
> 
> Except of course it isn't. Nobody sensibly complains that they can't 
> mangle the length of a list, or move keys around inside dicts, or 
> whatever. This data hiding is a good thing.
> 
> All I want is the ability to do with Python classes what I can do with C 
> extension types. I don't think that's an *unreasonable* ask, even if it 
> is *unpractical* given the current design of Python.
> 
I think the whole issue has received far more attention than is good for
it. Your requirements seem quite reasonable to me, even though I doubt
I'd ever use them. But it isn't *me* you have to persuade to get them in
the language, is it?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 21:06:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 21:06:49 -0500
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <gm5b2f$dcp$1@ger.gmane.org>
References: <gm4fcr$tr7$1@online.de>	<mailman.8540.1233516823.3487.python-list@python.org>	<gm58jn$nu3$1@online.de>
	<gm5b2f$dcp$1@ger.gmane.org>
Message-ID: <gm5kfp$vmg$2@ger.gmane.org>

rdmurray at bitdance.com wrote:
> Quoth Christoph Zwerschke <cito at online.de>:
>> rdmurray at bitdance.com schrieb:
>>> Quoth Christoph Zwerschke <cito at online.de>:
>>>>    With Py 2.3 (without IPv6 support) this is only the IPv4 address,
>>>>    but with Py 2.4-2.6 the order is (on my Win XP host) the IPv6 address
>>>>    first, then the IPv4 address. Since the IPv6 address is checked first,
>>>>    this gives a timeout and causes the slow connect() call. The order by
>>>>    which getaddrinfo returns IPv4/v6 under Linux seems to vary depending
>>>>    on the glibc version, so it may be a problem on other platforms, too.
>>> Based on something I read in another thread, this appears to be a problem
>>> only under Windows.  Everybody else implemented the TCP/IP stack according
>>> to spec, and the IPV6 connect attempt times out immediately, producing
>>> no slowdown.
>>>
>>> Microsoft, however....
>> The order in which getaddrinfo returns IPv4 and IPv6 is probably not 
>> written in the specs (Posix 1003.1g and RFC 2553). The fact that Windows 
>> returns IPv6 addresses first is not wrong in itself.
>>
>> For this discussion, see also
>> http://www.ops.ietf.org/lists/v6ops/v6ops.2002/msg00869.html
>> https://bugzilla.redhat.com/show_bug.cgi?id=190495
>>
>> But yes, I also wonder why the connect to the IPv6 loopback address does 
>> not time out more quickly on Windows.
> 
> Right, it's not the order of the returned items that's the Microsoft
> weirdness, it's the long timeout on an attempt to connect to something
> that doesn't exist.  There was a long discussion about this, and it might
> even have been on python-dev, but I can't lay my hands on the thread.
> In short, Microsoft retries and waits a while when the far end says
> "no thanks" to a connection attempt, instead of immediately returning
> the connection failure the way Linux and etc and etc do.  This applies
> to IPV4, too.
> 
Search for the subject line "socket.create_connection slow" - this was
discovered by Kristjan Valur Jonsson. It certainly seems like a
Microsoft weirdness.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From casevh at gmail.com  Sun Feb  1 21:20:15 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 18:20:15 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com>
Message-ID: <9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com>

On Feb 1, 1:04?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
>
> > On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > > which is probably very inefficient, but I can't see anything better.....
>
> > > Tim
>
> > Take a look at gmpy and the is_power function. I think it will do
> > exactly what you want.
>
> And the root function will give you the root AND tell you whether
> it was an integral root:
>
> >>> gmpy.root(a,13)
>
> (mpz(3221), 0)
>
> In this case, it wasn't.
>
I think the original poster wants to know if a large number has an
exact integral root for any exponent. is_power will give you an answer
to that question but won't tell you what the root or exponent is. Once
you know that the number is a perfect power, you can root to find the
root.

>
> >http://code.google.com/p/gmpy/
>
> > casevh
>
>



From flouger at gmail.com  Sun Feb  1 21:23:37 2009
From: flouger at gmail.com (Sam Price)
Date: Sun, 1 Feb 2009 18:23:37 -0800 (PST)
Subject: Question about wx folder browser widget
Message-ID: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>

Is there any good wx widgets that provide the same feel as folder/file
browser.
I want to be notified when a user tries to drag and drop a file/folder
on the widget, and then copy that file/folder to a new folder an do
operations on it.

Wanted to check first to see if something exists, and not reinvent the
wheel.

Thank you,
Sam Price


From lxkain at gmail.com  Sun Feb  1 21:31:34 2009
From: lxkain at gmail.com (LX)
Date: Sun, 1 Feb 2009 18:31:34 -0800 (PST)
Subject: AssertionError not caught?
Message-ID: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>

This one has me mystified good!

This works (print statement is executed as the Exception is caught) as
advertised:
    try:
        raise AssertionError
    except AssertionError:
        print "caught AssertionError"


But this one does not:

   def test():
        raise AssertionError

    try:
        test()
    except AssertionError:
        print "caught AssertionError"

other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
[GCC 4.0.1 (Apple Computer, Inc. build 5341)].

Is this a bug? Any hints / help would be much appreciated! Thank you.


From clp2 at rebertia.com  Sun Feb  1 21:44:14 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 18:44:14 -0800
Subject: AssertionError not caught?
In-Reply-To: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>

On Sun, Feb 1, 2009 at 6:31 PM, LX <lxkain at gmail.com> wrote:
> This one has me mystified good!
>
> This works (print statement is executed as the Exception is caught) as
> advertised:
>    try:
>        raise AssertionError
>    except AssertionError:
>        print "caught AssertionError"
>
>
> But this one does not:
>
>   def test():
>        raise AssertionError
>
>    try:
>        test()
>    except AssertionError:
>        print "caught AssertionError"
>
> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
>
> Is this a bug? Any hints / help would be much appreciated! Thank you.

My Mac begs to differ:

~ $ cat Desktop/tmp.py
def test():
   raise AssertionError

try:
   test()
except AssertionError:
   print "caught AssertionError"
~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5
Desktop/tmp.py
caught AssertionError
~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5
Python 2.5.1 (r251:54863, Feb  4 2008, 21:48:13)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin

The problem must lie elsewhere.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gdamjan at gmail.com  Sun Feb  1 21:50:16 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 03:50:16 +0100
Subject: Completer with history for Python 3 ?
Message-ID: <9k3i56-2d3.ln1@archaeopteryx.softver.org.mk>

I've been long using this recipe [1] ?Completer with history viewer 
support and more features? with the interactive prompt of python 2.x
But it's not compatible with Python 3.0

Anyone know of a similar functionality for Python 3.0 or I should try to 
port this script?

[1]
http://code.activestate.com/recipes/496822/

-- 
?????? ( http://softver.org.mk/damjan/ )

Spammers scratch here with a diamond to find my address:
|||||||||||||||||||||||||||||||||||||||||||||||



From lxkain at gmail.com  Sun Feb  1 21:51:53 2009
From: lxkain at gmail.com (Alexander Kain)
Date: Sun, 1 Feb 2009 18:51:53 -0800
Subject: AssertionError not caught?
In-Reply-To: <50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
	<50697b2c0902011844n2007e5b2q19cfa2fb977f3818@mail.gmail.com>
Message-ID: <88312E27-1EFD-4AEB-9C4C-87B7D9F196CA@gmail.com>

Thank you for restoring sanity to my world!

Indeed, it seems to have to do with the way that the WingIDE debugger  
works - it actually catches the error correctly , but it -->sets a  
breakpoint at the original raise first<---. This only occurs for the  
AssertionError. The debugger can then be continued.

Thank you again!

On Feb 1, 2009, at 6:44 PM, Chris Rebert wrote:

> On Sun, Feb 1, 2009 at 6:31 PM, LX <lxkain at gmail.com> wrote:
>> This one has me mystified good!
>>
>> This works (print statement is executed as the Exception is caught)  
>> as
>> advertised:
>>   try:
>>       raise AssertionError
>>   except AssertionError:
>>       print "caught AssertionError"
>>
>>
>> But this one does not:
>>
>>  def test():
>>       raise AssertionError
>>
>>   try:
>>       test()
>>   except AssertionError:
>>       print "caught AssertionError"
>>
>> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with  
>> the
>> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
>> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
>>
>> Is this a bug? Any hints / help would be much appreciated! Thank you.
>
> My Mac begs to differ:
>
> ~ $ cat Desktop/tmp.py
> def test():
>   raise AssertionError
>
> try:
>   test()
> except AssertionError:
>   print "caught AssertionError"
> ~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/ 
> python2.5
> Desktop/tmp.py
> caught AssertionError
> ~ $ /System/Library/Frameworks/Python.framework/Versions/2.5/bin/ 
> python2.5
> Python 2.5.1 (r251:54863, Feb  4 2008, 21:48:13)
> [GCC 4.0.1 (Apple Inc. build 5465)] on darwin
>
> The problem must lie elsewhere.
>
> Cheers,
> Chris
>
> -- 
> Follow the path of the Iguana...
> http://rebertia.com



From bignose+hates-spam at benfinney.id.au  Sun Feb  1 21:55:01 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 13:55:01 +1100
Subject: AssertionError not caught?
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <87r62h1ray.fsf@benfinney.id.au>

LX <lxkain at gmail.com> writes:

> This works (print statement is executed as the Exception is caught)
> as advertised:

You don't actually show us the output you get.

>     try:
>         raise AssertionError
>     except AssertionError:
>         print "caught AssertionError"

    >>> try:
    ...     raise AssertionError
    ... except AssertionError:
    ...     print "caught AssertionError"
    ...
    caught AssertionError

> But this one does not:
> 
>    def test():
>         raise AssertionError
> 
>     try:
>         test()
>     except AssertionError:
>         print "caught AssertionError"

    >>> def test():
    ...     raise AssertionError
    ...
    >>> try:
    ...     test()
    ... except AssertionError:
    ...     print "caught AssertionError"
    ... 
    caught AssertionError

> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with
> the standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13) [GCC
> 4.0.1 (Apple Computer, Inc. build 5341)].

    Python 2.5.2 (r252:60911, Jan  4 2009, 22:51:23)
    [GCC 4.3.2] on linux2

> Is this a bug?

It's much more likely to be a difference between the code you posted
here and the code you're actually running.

-- 
 \           ?It ain't so much the things we don't know that get us in |
  `\    trouble. It's the things we know that ain't so.? ?Artemus Ward |
_o__)                                       (1834-67), U.S. journalist |
Ben Finney


From steve at holdenweb.com  Sun Feb  1 21:58:07 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 21:58:07 -0500
Subject: Question about wx folder browser widget
In-Reply-To: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
References: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
Message-ID: <gm5ng0$68l$1@ger.gmane.org>

Sam Price wrote:
> Is there any good wx widgets that provide the same feel as folder/file
> browser.
> I want to be notified when a user tries to drag and drop a file/folder
> on the widget, and then copy that file/folder to a new folder an do
> operations on it.
> 
> Wanted to check first to see if something exists, and not reinvent the
> wheel.
> 
There's TreeCtrl, and CustomTreeCtrl. I don't know whether they can be
used with drag and drop, but take alook at

  http://wiki.wxpython.org/DragAndDrop

to see some code and get an idea of how to find out whether it will
adapt to those controls.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  1 22:01:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 01 Feb 2009 22:01:29 -0500
Subject: AssertionError not caught?
In-Reply-To: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
References: <14fe6987-b03b-4d84-b4d3-8a68703fa0b1@k1g2000prb.googlegroups.com>
Message-ID: <gm5nma$68l$2@ger.gmane.org>

LX wrote:
> This one has me mystified good!
> 
> This works (print statement is executed as the Exception is caught) as
> advertised:
>     try:
>         raise AssertionError
>     except AssertionError:
>         print "caught AssertionError"
> 
> 
> But this one does not:
> 
>    def test():
>         raise AssertionError
> 
>     try:
>         test()
>     except AssertionError:
>         print "caught AssertionError"
> 
> other errors (e.g. IOError) work fine! This is on OSX 10.5.6, with the
> standard Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)].
> 
> Is this a bug? Any hints / help would be much appreciated! Thank you.

This works for me under Cygwin:

>>> def test():
...     raise AssertionError
...
>>> try:
...     test()
... except AssertionError:
...     print "caught AssertionError"
...
caught AssertionError
>>>

I note from your indentation that it looks as though your code was
guarded by some other statement. Is it possible it wasn't executed at all?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Sun Feb  1 22:11:39 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 03:11:39 +0000 (UTC)
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <gm5o9b$82i$1@ger.gmane.org>

Quoth Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>:
> On Sun, 01 Feb 2009 12:01:11 -0800, Stephen Hansen wrote:
> 
> > <br><div class="gmail_quote"><blockquote class="gmail_quote"
> > style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
> > 0.8ex; padding-left: 1ex;"><br> I'd like to know how to elegantly check
> > a list for the membership of<br> any of its items to another list.
> > &nbsp;Not caring for elegance, I would<br> use the following code:<br>
> > </blockquote><div><br>That's one of the useful properties of
> > sets:<br><br>&gt;&gt;&gt; a = [1,2,3]<br>&gt;&gt;&gt; b =
> > [3,4,5,6]<br>&gt;&gt;&gt; set(a) &amp;
> > set(b)<br>set([3])<br>&gt;&gt;&gt;
> > set(a).intersection(b)<br>set([3])<br> <br>That's two spellings of the
> > same thing. As for testing: an empty set like an empty list will return
> > false, so "if set(a) &amp; set(b):" will be true or false based on if
> > there's any commonalities between the two
> > lists.<br><br>--Stephen</div></div><br>
> 
> 
> Stephen, do you see the utter mess your posts look like to some others?

I don't even see Stephen Hansen's posts.  My newsreader just shows the
header and says "[HTML part not displayed]".

--RDM



From apt.shansen at gmail.com  Sun Feb  1 22:16:49 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 19:16:49 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <7a9c25c20902011916t7c0d4dd9n2225ba80ef49e75b@mail.gmail.com>

> Stephen, do you see the utter mess your posts look like to some others?

Whoops, I was experimenting with a new Firefox add-on that fiddled
with Gmail, and hadn't noticed it changed my output format to HTML out
from under me.

Sorry!

--S


From apt.shansen at gmail.com  Sun Feb  1 22:34:46 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 19:34:46 -0800
Subject: Auto Logon to site and get page
In-Reply-To: <456128.62923.qm@web112207.mail.gq1.yahoo.com>
References: <456128.62923.qm@web112207.mail.gq1.yahoo.com>
Message-ID: <7a9c25c20902011934u62c61f83w40e4444fe883589@mail.gmail.com>

> This doesn't however, it just sends me back to the main login page, doenst
> say invalid password or anything. I've checked, yes the python hmac hash
> function produces the same results (encrypted password) as the md5.js file.
> Does anyone know what I am doing wrong??

My guess? After you successfully login the webpage is setting a cookie
on your browser with a token to mark you as authenticated and let you
in. Lots of websites do that: I don't think urllib2 is handling that
by itself so you may need to. You also may have to set a User-agent
header to convince it you're legitimate.

I googled briefly and came up with
http://www.voidspace.org.uk/python/articles/cookielib.shtml which may
be totally useless or of great value. I am not providing it as a
solution, it just at a brief glance looks potentially relevant :)

--S


From jabar004 at gmail.com  Sun Feb  1 22:35:05 2009
From: jabar004 at gmail.com (JuanPablo)
Date: Mon, 2 Feb 2009 00:35:05 -0300
Subject: call other program
Message-ID: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>

hi,
  I have a newbie question.
In bash is posible call other program, send and recieve message with this.

example:
$ python  > output << EOF
> print "hello world"
> EOF
$ cat output
hello world

in python exist some similar ?

many thanks
JuanPablo
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From clp2 at rebertia.com  Sun Feb  1 22:37:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 1 Feb 2009 19:37:09 -0800
Subject: call other program
In-Reply-To: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>
References: <110df1290902011935q275bccfag7f25121eb94125ac@mail.gmail.com>
Message-ID: <50697b2c0902011937u42c6d437uad8f6b7d5726a24f@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:35 PM, JuanPablo <jabar004 at gmail.com> wrote:
> hi,
>   I have a newbie question.
> In bash is posible call other program, send and recieve message with this.
>
> example:
> $ python  > output << EOF
>> print "hello world"
>> EOF
> $ cat output
> hello world
>
> in python exist some similar ?

See the `subprocess` module -- http://docs.python.org/library/subprocess.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gdamjan at gmail.com  Sun Feb  1 22:38:12 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 02 Feb 2009 04:38:12 +0100
Subject: Completer with history for Python 3 ?
References: <9k3i56-2d3.ln1@archaeopteryx.softver.org.mk>
Message-ID: <4e6i56-3e5.ln1@archaeopteryx.softver.org.mk>

> I've been long using this recipe [1] ?Completer with history viewer
> support and more features? with the interactive prompt of python 2.x
> But it's not compatible with Python 3.0
> 
> Anyone know of a similar functionality for Python 3.0 or I should try
> to port this script?
> 
> [1]
> http://code.activestate.com/recipes/496822/
 
Well, I've made a patch that makes it kinda work
http://paste.lisp.org/display/74707

it does work except that the irlcompleter doesn't complete filenames or 
usernames... any idea why?


-- 
?????? ( http://softver.org.mk/damjan/ )

Give me the knowledge to change the code I do not accept, 
the wisdom not to accept the code I cannot change, 
and the freedom to choose my preference.



From cjns1989 at gmail.com  Sun Feb  1 22:46:54 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Sun, 01 Feb 2009 22:46:54 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <874ozd3cr3.fsf@benfinney.id.au>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
Message-ID: <20090202034654.GD30237@turki.gavron.org>

On Sun, Feb 01, 2009 at 07:26:24PM EST, Ben Finney wrote:
> aahz at pythoncraft.com (Aahz) writes:
> 
> > Just to register a contrary opinion: I *hate* syntax highlighting
> 
> On what basis?

Real men hate syntax highlighting.


From bignose+hates-spam at benfinney.id.au  Sun Feb  1 22:47:51 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 14:47:51 +1100
Subject: Membership of multiple items to a list
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
	<mailman.8560.1233544309.3487.python-list@python.org>
Message-ID: <87myd51ouw.fsf@benfinney.id.au>

rdmurray at bitdance.com writes:

> I don't even see Stephen Hansen's posts. My newsreader just shows
> the header and says "[HTML part not displayed]".

Likewise.

Note to people who want to communicate in online fora: Set your client
to generate a ?text/plain? body only. HTML is either irrelevant to
your message (so don't generate it), or will result in your message
not even being seen at all by some readers (as in this case).

-- 
 \        ?If it ain't bust don't fix it is a very sound principle and |
  `\      remains so despite the fact that I have slavishly ignored it |
_o__)                                     all my life.? ?Douglas Adams |
Ben Finney


From sjmachin at lexicon.net  Sun Feb  1 22:52:04 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 1 Feb 2009 19:52:04 -0800 (PST)
Subject: getting values from a text file (newby)
References: <mailman.8534.1233511369.3487.python-list@python.org> 
	<e667488d-7595-4a9b-a684-7739b47f351b@z28g2000prd.googlegroups.com> 
	<e1c3a5c9-0ab5-43b3-965d-d77af0280be8@x6g2000pre.googlegroups.com> 
	<fe74d94e-c100-4e45-a6f8-88d886f32ccc@r10g2000prf.googlegroups.com>
Message-ID: <26d7ffc0-1bca-452c-b8c2-faca5e005e07@w1g2000prm.googlegroups.com>

On Feb 2, 10:18?am, vsoler <vicente.so... at gmail.com> wrote:
> On 1 feb, 23:57, John Machin <sjmac... at lexicon.net> wrote:
>
> > On Feb 2, 6:18?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > r: in the open statement, why do you use 'rb' as 2nd argument? b is
> > > supposed to be binary, and my file is text!
>
> > Because unlike Stephen, r has read the csv manual. Binary mode is
> > required to handle properly cases like '\n' embedded in a field --
> > something which can easily happen when the data has been extracted
> > from a database with slack data-entry validation.
>
> Where can I get the csv manual?

http://www.python.org/doc/2.6/library/csv.html

If you're on Windows, you've got it already:
Start > All Programs > Python 2.6 > Python Manuals
type "csv" (without the quotes) into the textbox
hit the Enter key



From hungvn94 at gmail.com  Sun Feb  1 23:16:45 2009
From: hungvn94 at gmail.com (Hung Vo)
Date: Sun, 1 Feb 2009 20:16:45 -0800 (PST)
Subject: is python Object oriented??
References: <mailman.8529.1233508222.3487.python-list@python.org>
Message-ID: <f8af3a0d-eda5-4ae9-852a-66595a3a0694@v5g2000prm.googlegroups.com>

On Feb 2, 4:10?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!
>
>
> I was long-winded the last time I responded to this point so no one probably read it :)

Yes, we read it. You made good points!!

Cheers,
Hung


From david.lyon at preisshare.net  Sun Feb  1 23:17:50 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 01 Feb 2009 23:17:50 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <497FAFE4.4040602@gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
Message-ID: <83900549676010b8244969ece9319a78@preisshare.net>

Hi all, 

I am pleased to announce that we have started a new python 
project on sourceforge. 

  Python Package Manager 
  pythonpkgmgr.sourceforge.net 

The goal is to provide a cross platform GUI tool that will 
vastly simplify loading and installing packages under python. 

 - written in python 
 - use WXWidgets for cross compatability
 - utilises distutils
 - provide a GUI wrapper for EasyInstall and pip
 - fetches packages from http://pypi.python.org/pypi 
   using their XML-RPC interface. 

Feel free to apply to join the project and help us build the solution that
we all need and deserve. 

Regards David Lyon 



From prologic at shortcircuit.net.au  Sun Feb  1 23:47:29 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Mon, 2 Feb 2009 14:47:29 +1000
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <83900549676010b8244969ece9319a78@preisshare.net>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
Message-ID: <e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:17 PM, David Lyon <david.lyon at preisshare.net> wrote:
> Hi all,
>
> I am pleased to announce that we have started a new python
> project on sourceforge.
>
>  Python Package Manager
>  pythonpkgmgr.sourceforge.net
>
> The goal is to provide a cross platform GUI tool that will
> vastly simplify loading and installing packages under python.
>
>  - written in python
>  - use WXWidgets for cross compatability
>  - utilises distutils
>  - provide a GUI wrapper for EasyInstall and pip
>  - fetches packages from http://pypi.python.org/pypi
>   using their XML-RPC interface.
>
> Feel free to apply to join the project and help us build the solution that
> we all need and deserve.
>
> Regards David Lyon

What's wrong with Enstaller from Enthought ?

Can I make a few suggestions ?

To be truly cross platform, consider
using the Tcl/Tk toolkit rather tahn
wxWindows. Why ? Because Tcl/TK
is packaged and provided along with
most Python distributions.

Also, to reduce the amount of work
you as developers need to do and to
aid in the "code reuse" philosophy,
I would not simply have wrappers around
easy_install and pip, I would integrate
as best as you can into these libraries
without trying to add or rewrite too much.

Also, consider integrating with yolk
as well, as it provides some food features
and functionality that easy_install and pip
don't provide.

cheers
James


From david.lyon at preisshare.net  Sun Feb  1 23:57:05 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Sun, 01 Feb 2009 23:57:05 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
Message-ID: <f16976575cae1062e8fbdb364bca77ea@preisshare.net>

> What's wrong with Enstaller from Enthought ?

for a start....

on https://svn.enthought.com/enthought/wiki/Enstaller

it claims to be depracated...

> Can I make a few suggestions ?

Sure..

> To be truly cross platform, consider
> using the Tcl/Tk toolkit rather tahn
> wxWindows. Why ? Because Tcl/TK
> is packaged and provided along with
> most Python distributions.

I agree with your point..

The problem is that Tcl/TK is a functionaly
handicapped and results in a less powerful GUI.

In an installer, it is not so hard to install
the wxWidgets dll (under windows)

But later, I won't mind redoing it in tk if
it becomes too much of a hassle.
 
> I would not simply have wrappers around
> easy_install and pip, I would integrate
> as best as you can into these libraries
> without trying to add or rewrite too much.

Sure... I agree

> Also, consider integrating with yolk
> as well, as it provides some food features
> and functionality that easy_install and pip
> don't provide.

Thanks - I will check out your suggestions in
detail.

Take care

David




From prologic at shortcircuit.net.au  Mon Feb  2 00:24:06 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Mon, 2 Feb 2009 15:24:06 +1000
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <f16976575cae1062e8fbdb364bca77ea@preisshare.net>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
Message-ID: <e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:57 PM, David Lyon <david.lyon at preisshare.net> wrote:
>> To be truly cross platform, consider
>> using the Tcl/Tk toolkit rather tahn
>> wxWindows. Why ? Because Tcl/TK
>> is packaged and provided along with
>> most Python distributions.
>
> I agree with your point..
>
> The problem is that Tcl/TK is a functionaly
> handicapped and results in a less powerful GUI.
>
> In an installer, it is not so hard to install
> the wxWidgets dll (under windows)
>
> But later, I won't mind redoing it in tk if
> it becomes too much of a hassle.

David, I would really recommend that you
seriously consider using the Tcp/Tk toolkit.
Why ? Because of my point above, you'll
find the tool will most likely have a greater
impact and uptake than one requiring a user
or developer to install a 3rd party toolkit
and library just to use your gui package
manager :)

Trust me when I say this, the simpler you
make this, the better. "Powerful" is meaningless
in the context of programming - it has no
meaning. If you meant wxWindows/wxWidgets
are more feature-rich, then yes I agree - but
at what cost ? :)

My 2c,

cheers
James


From an00na at gmail.com  Mon Feb  2 01:01:17 2009
From: an00na at gmail.com (an0)
Date: Sun, 1 Feb 2009 22:01:17 -0800 (PST)
Subject: Why such different HTTP response results between 2.5 and 3.0
Message-ID: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>

Below are two semantically same snippets for querying the same partial
HTTP response, for Python2.5 and Python 3.0 respectively.
However, the 3.0 version returns a not-so-right result(msg) which is a
bytes of length 239775, while the 2.5 version returns a good msg which
is a 239733 byte-long string that is the content of a proper zip file.
I really can't figure out what's wrong, thought I've sought out some
"\r\n" segments in msg 3.0 that is absent in msg 2.5.
So are there anyone could give me some hints? Thanks in advance.

Code:

# Python 2.5
import urllib2
auth_handler = urllib2.HTTPBasicAuthHandler()
auth_handler.add_password(realm="pluses and minuses",
                          uri='http://www.pythonchallenge.com/pc/hex/
unreal.jpg',
                          user='butter',
                          passwd='fly')
opener = urllib2.build_opener(auth_handler)

req = urllib2.Request('http://www.pythonchallenge.com/pc/hex/
unreal.jpg')
req.add_header('Range', 'bytes=1152983631-')
res = opener.open(req)
msg = res.read()

# Python 3.0
import urllib.request
auth_handler = urllib.request.HTTPBasicAuthHandler()
auth_handler.add_password(realm="pluses and minuses",
                          uri='http://www.pythonchallenge.com/pc/hex/
unreal.jpg',
                          user='butter',
                          passwd='fly')
opener = urllib.request.build_opener(auth_handler)

req = urllib.request.Request('http://www.pythonchallenge.com/pc/hex/
unreal.jpg')
req.add_header('Range', 'bytes=1152983631-')
res = opener.open(req)
msg = res.read()


From mensanator at aol.com  Mon Feb  2 01:02:32 2009
From: mensanator at aol.com (Mensanator)
Date: Sun, 1 Feb 2009 22:02:32 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com>
Message-ID: <81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com>

On Feb 1, 8:20?pm, casevh <cas... at gmail.com> wrote:
> On Feb 1, 1:04?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
> > On Feb 1, 2:27?am, casevh <cas... at gmail.com> wrote:
>
> > > On Jan 31, 9:36?pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. ?At the moment, because of accuracy concerns, I'm doing something like
>
> > > > ? ? ? ? ? ? ? ? ? ? for root in powersp:
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? nroot = round(bignum**(1.0/root))
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? if bignum==long(nroot)**root:
> > > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?.........
> > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > Tim
>
> > > Take a look at gmpy and the is_power function. I think it will do
> > > exactly what you want.
>
> > And the root function will give you the root AND tell you whether
> > it was an integral root:
>
> > >>> gmpy.root(a,13)
>
> > (mpz(3221), 0)
>
> > In this case, it wasn't.
>
> I think the original poster wants to know if a large number has an
> exact integral root for any exponent. is_power will give you an answer
> to that question but won't tell you what the root or exponent is. Once
> you know that the number is a perfect power, you can root to find the
> root.

But how do you know what exponent to use?

>
>
>
>
>
> > >http://code.google.com/p/gmpy/
>
> > > casevh



From BrianVanderburg2 at aim.com  Mon Feb  2 01:37:13 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Mon, 02 Feb 2009 01:37:13 -0500
Subject: Why such different HTTP response results between 2.5 and 3.0
In-Reply-To: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>
References: <abcdde7f-6eca-4a26-9125-33e229efacb8@k1g2000prb.googlegroups.com>
Message-ID: <49869499.7070109@aim.com>

an00na at gmail.com wrote:
> Below are two semantically same snippets for querying the same partial
> HTTP response, for Python2.5 and Python 3.0 respectively.
> However, the 3.0 version returns a not-so-right result(msg) which is a
> bytes of length 239775, while the 2.5 version returns a good msg which
> is a 239733 byte-long string that is the content of a proper zip file.
> I really can't figure out what's wrong, thought I've sought out some
> "\r\n" segments in msg 3.0 that is absent in msg 2.5.
> So are there anyone could give me some hints? Thanks in advance.
>
> Code:
>
> # Python 2.5
> import urllib2
> auth_handler = urllib2.HTTPBasicAuthHandler()
> auth_handler.add_password(realm="pluses and minuses",
>                           uri='http://www.pythonchallenge.com/pc/hex/
> unreal.jpg',
>                           user='butter',
>                           passwd='fly')
> opener = urllib2.build_opener(auth_handler)
>
> req = urllib2.Request('http://www.pythonchallenge.com/pc/hex/
> unreal.jpg')
> req.add_header('Range', 'bytes=1152983631-')
> res = opener.open(req)
> msg = res.read()
>
> # Python 3.0
> import urllib.request
> auth_handler = urllib.request.HTTPBasicAuthHandler()
> auth_handler.add_password(realm="pluses and minuses",
>                           uri='http://www.pythonchallenge.com/pc/hex/
> unreal.jpg',
>                           user='butter',
>                           passwd='fly')
> opener = urllib.request.build_opener(auth_handler)
>
> req = urllib.request.Request('http://www.pythonchallenge.com/pc/hex/
> unreal.jpg')
> req.add_header('Range', 'bytes=1152983631-')
> res = opener.open(req)
> msg = res.read()
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
 From what I can tell, Python 2.5 returns the request automatically 
decoded as text.  Python 3.0 returns a bytes object and doesn't decode 
it at all.  I did a test with urlopen:

In 2.5 for http://google.com just get the regular HTML
In 3.0 I get some extras at the start and end:

    191d\r\n at the start
    \r\n0\r\n\r\n at the end

In 2.5, newlines are automatically decoded
In 3.0, the \r\n pairs are kept

I hope their is an easy way to decode it as it was in 2.x

Brian Vanderburg II


From cito at online.de  Mon Feb  2 01:43:59 2009
From: cito at online.de (Christoph Zwerschke)
Date: Mon, 02 Feb 2009 07:43:59 +0100
Subject: Problem with slow httplib connections on Windows (and maybe other
	platforms)
In-Reply-To: <mailman.8555.1233540423.3487.python-list@python.org>
References: <gm4fcr$tr7$1@online.de>	<mailman.8540.1233516823.3487.python-list@python.org>	<gm58jn$nu3$1@online.de>	<gm5b2f$dcp$1@ger.gmane.org>
	<mailman.8555.1233540423.3487.python-list@python.org>
Message-ID: <gm64nb$ech$1@online.de>

Steve Holden schrieb:
> Search for the subject line "socket.create_connection slow" - this was
> discovered by Kristjan Valur Jonsson. It certainly seems like a
> Microsoft weirdness.

Thanks for the pointer, Steve. I hadn't seen that yet. I agree that's 
actually the real problem here. The solution suggested in that thread, 
using a dual-stacked socket for the TCPserver, seems a good one to me.

-- Christoph


From meswamy at gmail.com  Mon Feb  2 01:44:35 2009
From: meswamy at gmail.com (swamynathan)
Date: Mon, 2 Feb 2009 12:14:35 +0530
Subject: key capture
Message-ID: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>

hello,
im making a virtual piano in python where on key stroke a wav is played from
a location
now to implement  a fully functional piano i need to have multiple key
stroke captures  ie if 2 or 3 keys pressed then the function which playes
the wav is called with 3 parameters

how to implement this or any other suggestion(i was asked to try multi
threading which dint seem optimal)

-- 
your caring/loving/sincere/oyoyoy[select it urself]
swamynathan.
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From casevh at gmail.com  Mon Feb  2 02:01:58 2009
From: casevh at gmail.com (casevh)
Date: Sun, 1 Feb 2009 23:01:58 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com> 
	<81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com>
Message-ID: <68b1337a-1938-4765-b28a-dc526dd8e8c1@x6g2000pre.googlegroups.com>

On Feb 1, 10:02?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 1, 8:20 pm, casevh <cas... at gmail.com> wrote:
>
>
>
> > On Feb 1, 1:04 pm, Mensanator <mensana... at aol.com> wrote:
>
> > > On Feb 1, 2:27 am, casevh <cas... at gmail.com> wrote:
>
> > > > On Jan 31, 9:36 pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. At the moment, because of accuracy concerns, I'm doing something like
>
> > > > > for root in powersp:
> > > > > nroot = round(bignum**(1.0/root))
> > > > > if bignum==long(nroot)**root:
> > > > > .........
> > > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > > Tim
>
> > > > Take a look at gmpy and the is_power function. I think it will do
> > > > exactly what you want.
>
> > > And the root function will give you the root AND tell you whether
> > > it was an integral root:
>
> > > >>> gmpy.root(a,13)
>
> > > (mpz(3221), 0)
>
> > > In this case, it wasn't.
>
> > I think the original poster wants to know if a large number has an
> > exact integral root for any exponent. is_power will give you an answer
> > to that question but won't tell you what the root or exponent is. Once
> > you know that the number is a perfect power, you can root to find the
> > root.
>
> But how do you know what exponent to use?

That's the gotcha. :) You still need to test all prime exponents until
you find the correct one. But it is much faster to use is_power to
check whether or not a number has representation as a**b and then try
all the possible exponents than to just try all the possible exponents
on all the numbers.

>
>
>
> > > >http://code.google.com/p/gmpy/
>
> > > > casevh
>
>



From raykyoto at gmail.com  Mon Feb  2 02:05:50 2009
From: raykyoto at gmail.com (Ray)
Date: Sun, 1 Feb 2009 23:05:50 -0800 (PST)
Subject: Import without executing module
Message-ID: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>


Hi all,

I'm quite new to python as I've only just started to learn about it a
few days ago...  I am trying to do something and after reading about
it, I'm still not sure whether or not it can be done.

Basically, someone has created a python script and I would like to
make use of his functions.  I would prefer to not modify his file so
what I would like to do is just write my script and import parts that
are needed.  i.e., I would like to separate my changes from his as
best as I can.  However, that other module has both functions (def's,
which I would like to use) and top-level commands which I don't need
and in fact, prints errors when I import it since it was meant to be
run as a top-level module and not imported in.  i.e., its expecting
arguments to be supplied.

For example, suppose I have a module test.py:

-----
from test2 import foo
foo()

#import test2
#test2.foo()

print "test says hello"
-----

and test2.py:

-----
def foo():
  print "foo is being executed"

print "test2 says hello"
-----

and I would like to run "python test.py" without "test2 says hello"
appearing.  I figured "import test2" would not work, so I thought that
maybe "from" would only take the functions listed, but no.  In the
end, it is just importing all of "test2" and then renaming it:  foo =
test2.foo .

This isn't a very serious problem as I obviously have the source and
can just copy the functions and attribute the original author (that's
ok).  But, it would be nice if I can make use of those functions
without touching that file [test2.py in the above example].

Is this possible?

Thank you!

Ray




From apt.shansen at gmail.com  Mon Feb  2 02:19:09 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:19:09 -0800
Subject: Import without executing module
In-Reply-To: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
Message-ID: <7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:05 PM, Ray <raykyoto at gmail.com> wrote:
> Basically, someone has created a python script and I would like to
> make use of his functions.  I would prefer to not modify his file so
> what I would like to do is just write my script and import parts that
> are needed.  i.e., I would like to separate my changes from his as
> best as I can.  However, that other module has both functions (def's,
> which I would like to use) and top-level commands which I don't need
> and in fact, prints errors when I import it since it was meant to be
> run as a top-level module and not imported in.  i.e., its expecting
> arguments to be supplied.

Unfortunately, that's not possible, I believe. All the top level
commands in a particular Python script are executed: that's how the
functions get created.

--S


From n.kottiyath at gmail.com  Mon Feb  2 02:25:17 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Sun, 1 Feb 2009 23:25:17 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
Message-ID: <f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>

On Feb 2, 12:19?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Sun, Feb 1, 2009 at 11:05 PM, Ray <rayky... at gmail.com> wrote:
> > Basically, someone has created a python script and I would like to
> > make use of his functions. ?I would prefer to not modify his file so
> > what I would like to do is just write my script and import parts that
> > are needed. ?i.e., I would like to separate my changes from his as
> > best as I can. ?However, that other module has both functions (def's,
> > which I would like to use) and top-level commands which I don't need
> > and in fact, prints errors when I import it since it was meant to be
> > run as a top-level module and not imported in. ?i.e., its expecting
> > arguments to be supplied.
>
> Unfortunately, that's not possible, I believe. All the top level
> commands in a particular Python script are executed: that's how the
> functions get created.
>
> --S

Maybe he can wrap the things he dont need inside
if __name__ == '__main__':
check.


From gabriel.rossetti at arimaz.com  Mon Feb  2 02:33:05 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 02 Feb 2009 08:33:05 +0100
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>	<glo9ns$flv$1@zinnia.noc.ucla.edu>
	<497FAFE4.4040602@gmail.com>	<83900549676010b8244969ece9319a78@preisshare.net>	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
Message-ID: <4986A1B1.9070805@arimaz.com>

James Mills wrote:
> On Mon, Feb 2, 2009 at 2:57 PM, David Lyon <david.lyon at preisshare.net> wrote:
>   
>>> To be truly cross platform, consider
>>> using the Tcl/Tk toolkit rather tahn
>>> wxWindows. Why ? Because Tcl/TK
>>> is packaged and provided along with
>>> most Python distributions.
>>>       
>> I agree with your point..
>>
>> The problem is that Tcl/TK is a functionaly
>> handicapped and results in a less powerful GUI.
>>
>> In an installer, it is not so hard to install
>> the wxWidgets dll (under windows)
>>
>> But later, I won't mind redoing it in tk if
>> it becomes too much of a hassle.
>>     
>
> David, I would really recommend that you
> seriously consider using the Tcp/Tk toolkit.
> Why ? Because of my point above, you'll
> find the tool will most likely have a greater
> impact and uptake than one requiring a user
> or developer to install a 3rd party toolkit
> and library just to use your gui package
> manager :)
>   

Well, isn't tkinter being removed? 
(http://www.python.org/dev/peps/pep-3108/)
So the user will have to install it anyways, I think wx is way better 
that tkinter
from a user and a developer's perspective. I think it's time to let it 
go....but hey,
that's just my two cents...

Gabriel
> Trust me when I say this, the simpler you
> make this, the better. "Powerful" is meaningless
> in the context of programming - it has no
> meaning. If you meant wxWindows/wxWidgets
> are more feature-rich, then yes I agree - but
> at what cost ? :)
>
> My 2c,
>
> cheers
> James
> --
> http://mail.python.org/mailman/listinfo/python-list
>   


From apt.shansen at gmail.com  Mon Feb  2 02:36:53 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:36:53 -0800
Subject: Import without executing module
In-Reply-To: <f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
Message-ID: <7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>

> Maybe he can wrap the things he dont need inside
> if __name__ == '__main__':
> check.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yeah but he said he doesn't want to modify the file itself-- if he can
modify the file this can all go away readily, yes.

--S


From sibteym at infotechsw.com  Mon Feb  2 02:41:55 2009
From: sibteym at infotechsw.com (sibteym at infotechsw.com)
Date: Mon, 2 Feb 2009 13:11:55 +0530 (IST)
Subject: how to create data to dump into yaml file
Message-ID: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>

hi
    I have to create a yaml file using my list of objects.shall i need to
create a string using my objects and then load and dump that string or
is there any other way to create the yaml file.

i want a yaml file to be created from [Text, Author,......]in this format
Text:
    - value1
    - value2
    - value 3
Author:
     name: bookName


Thanks
Sibtey Mehdi






From taskinoor.hasan at csebuet.org  Mon Feb  2 02:43:56 2009
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 2 Feb 2009 13:43:56 +0600
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
Message-ID: <79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>

Can anyone explain what is the necessity of executing whole script when
importing. Isn't it enough to just put the module name in the namespace and
execute when some function is called?

On Mon, Feb 2, 2009 at 1:36 PM, Stephen Hansen <apt.shansen at gmail.com>wrote:

> > Maybe he can wrap the things he dont need inside
> > if __name__ == '__main__':
> > check.
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
> Yeah but he said he doesn't want to modify the file itself-- if he can
> modify the file this can all go away readily, yes.
>
> --S
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From apt.shansen at gmail.com  Mon Feb  2 02:50:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:50:36 -0800
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <4986A1B1.9070805@arimaz.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
	<4986A1B1.9070805@arimaz.com>
Message-ID: <7a9c25c20902012350r37502a5by99a631ad3d7f686c@mail.gmail.com>

> Well, isn't tkinter being removed?
> (http://www.python.org/dev/peps/pep-3108/)

PEP3108 isn't only about removals, but some renaming and
reorganizations of certain packages / modules to be consistent within
the standard library. In that section of PEP3108 they're talking about
grouping tkinter modules together in a different way.

That said...

> So the user will have to install it anyways, I think wx is way better that
> tkinter
> from a user and a developer's perspective. I think it's time to let it
> go....but hey,

Honestly, I agree. There's a point to a meta-app like this being
"universally available" and since Tkinter is almost always available,
that's a boon. But Tkinter is a really, really poor choice in just
about every other category of how you make your decision IMHO.

If the OP wants to use a wxPython-based GUI, all power to him. If he
wants his utility to get wide adoption he just needs to make sure he
can get some binary installers; deps, rpms, windows .exe's, etc.
That's not at all impossible to do. Just takes extra work. If he wants
to do the work -- and have a good UI -- good for him.

--S


From berserker992 at gmail.com  Mon Feb  2 02:51:22 2009
From: berserker992 at gmail.com (berserker992 at gmail.com)
Date: Sun, 1 Feb 2009 23:51:22 -0800 (PST)
Subject: Problem With py2exe and ConfigParser
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
	<6um1i1FfqskrU1@mid.uni-berlin.de>
Message-ID: <7fad9e49-df2e-46db-a3cc-6e5b9f55e773@q36g2000vbn.googlegroups.com>


You can set an example? My English is bad, so I do not quite
understand


> > Hello, i use python 2.6 + PyQt4.
> > I compile my main.pyw. It is compile, but don't run. In
> > "index.exe.log" error log:
>
> >>>> ?File "index.pyw", line 100, in GetVal
> >>>> ConfigParser.NoSectionError: No section: 'Main'
>
> >>>> Code line 92 to 104 this is class that uses ConfigParser lib:
> >>>> class ConfigAcces:
> >>>> ? ?def __init__(self):
> >>>> ? ? ? ?self.cnf = ConfigParser()
> >>>> ? ?def GetLibUrl(self):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?return self.cnf.get("Main","lib_path")
> >>>> ? ?def GetVal(self, p, key):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?return self.cnf.get(p,key)
> >>>> ? ?def SetVal(self, selection, option, NewVal):
> >>>> ? ? ? ?self.cnf.read("config.ini")
> >>>> ? ? ? ?self.cnf.set(selection,option,NewVal)
> >>>> ? ? ? ?self.cnf.write(open("config.ini", "w"))
>
> > how do I fix this?
>
> By passing the right path for the configuration file? It's obviously not
> found.
>
> Diez



From jwalana at vsnl.net  Mon Feb  2 02:52:51 2009
From: jwalana at vsnl.net (jwalana at vsnl.net)
Date: Mon, 02 Feb 2009 12:52:51 +0500
Subject: Exception error when accessing the class variable at the termination
	of the program
Message-ID: <e244ddfd13312.4986eca3@vsnl.net>

Hi All,

   Here is a sample piece of code with which I am having a problem, with Python version 2.4.4

class Person:
    Count = 0   # This represents the count of objects of this class

    def __init__(self, name):
        self.name = name
        print name, ' is now created'
        Person.Count += 1

    def __del__(self):
        print self.name, ' is now deleted'
        Person.Count -= 1
        if Person.Count == 0:
            print 'The last object of Person class is now deleted'
        else:
            print 'There are still', Person.Count, ' objects of class Person'

x2 = Person("Krishna")
del x2

  When the above code is executed, it works properly.

  If the last statement del x2, is removed, then when the program terminates, this throws up an exception as shown below

Krishna  is now created
Krishna  is now deleted
Exception exceptions.AttributeError: "'NoneType' object has no attribute 'Count'
" in <bound method Person.__del__ of <__main__.Person instance at 0xf6532f6c>> ignored

 Can someone please explain why the exception happens in the case where there is no explicit del statement?

Thanks
Jana



From mail at microcorp.co.za  Mon Feb  2 02:53:50 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 09:53:50 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
Message-ID: <018801c9850e$3e019fe0$0d00a8c0@hendrik>

<rd.....murray at bitdance.com> wrote:

> 
> You, sir, should be programming in some language other than Python.

Why?  - Python is object oriented, but I can write whole systems
without defining a single class.
By analogy, if data hiding is added to language, I could write a 
whole system without hiding a single item.
Conversely, the lack of data hiding is perceived as a weakness,
and IMO harms the advocacy of the language - This is proven
by your statement above, whereby you are driving a user away,
simply because the language, in one small aspect, does not
give him what he wants, and the tenor of this thread has been
very much: "That's how it is - like it or lump it", and no amount
of careful explanation of why people want the feature has cut 
any ice - It has all the time been countered with statements
about how the proponents of private attributes "don't need it",
(as if they are plain dumb), that an underscore convention is 
"just as good", (It isn't), that you could crack it if you really 
tried, (so what?), and other more specious reasons.

This is IMO an arrogant attitude - 

Surely if "we are all adults here" we have to accept that the 
other man has as much right to get what he wants, as 
anybody else, and that his reasons are as valid as those of 
anybody else.

Somehow I don't think that the way this thread has run, is
the way to "win friends and influence people"  - not 
positively, anyway.

- Hendrik




From mail at microcorp.co.za  Mon Feb  2 02:57:23 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 09:57:23 +0200
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Addressalready in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>	<004e01c98095$f90f9440$0d00a8c0@hendrik><49855129.9070901@shopzeus.com>
	<gm46aj$ucc$1@ger.gmane.org>
Message-ID: <018901c9850e$3eba4180$0d00a8c0@hendrik>


"Steve Holden" <st. at hol.eb.com> wrote:

> 
> My previous reply assumed you are running some UNIX-like operating
> system. If you are on Windows then Jean-Paul's advice stands, as Windows
> *does* allow several processes to listen on the same port and randomly
> delivers incoming connections to one of the listening processes.
> 
> I believe this is because Microsoft failed to understand the original
> meaning of SO_REUSEADDR for their early TCP implementations, and
> persisted with this ghastly error in the name of backwards
> compatibility, justifying it by suggesting that listener pools could be
> created. Or some such nonsense. Perhaps someone with more insight into
> the development process could comment. It seems to me it's completely
> bizarre.
> 
> However, under Windows 2000 and later you should find there's an
> SO_EXCLUSIVEADDRUSE flag which you can use to ensure a single listener -
> see http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx. No
> need for separate locks.
> 

Thanks Steve - I am not the OP, I was just curious as to why
Jean-Paul was saying what he did - so the only reason I have 
not been bitten on windoze yet must be either because I am 
lucky, or because my server side stuff is linux and there is the 
occasional windows client.  So I don't really listen on windows.

"a pool of listeners" - just think of the fun one can have trying to
keep state between them - would be a marvellous job if someone
else is paying top dollar by the hour - I can just see the team growing
as the need for new specialists are discovered as one goes along.

:-)

- Hendrik




From apt.shansen at gmail.com  Mon Feb  2 02:58:25 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 1 Feb 2009 23:58:25 -0800
Subject: Import without executing module
In-Reply-To: <79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
Message-ID: <7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:43 PM, Taskinoor Hasan
<taskinoor.hasan at csebuet.org> wrote:
> Can anyone explain what is the necessity of executing whole script when
> importing. Isn't it enough to just put the module name in the namespace and
> execute when some function is called?

I'm not sure if I'm going to explain this right-- so bear with me.

The code:

    def something(other):
        return other + 1

Doesn't exist until that def statement is executed. "def", "class" and
such are not magical and immediately register something somewhere. Its
a statement that has to be executed to get a result, and that result
is bound as an assignment to the name specified.

Its not really all that different from:
    something = lambda other: other + 1

It can't pick through the top level instructions to determine what to
execute if imported vs run, as every statement has the possibility of
producing some binding of name to value and until you go and execute
it you won't know. You may do something like:

    try:
        import blah
    except:
        blah = None

You have to execute all of that to get a value for 'blah'. In Python,
there's nothing really special about a function vs any other value.
They are all objects that are assigned to a name in a given namespace.
You can do dynamic things at the top level to result in different
things being bound to the modules namespace based upon the statements
and expressions evaluated.

Does that make sense? If not someone else'll have to explain :)

--Stephen


From apt.shansen at gmail.com  Mon Feb  2 03:23:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:23:55 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <87myd51ouw.fsf@benfinney.id.au>
References: <mailman.8543.1233518485.3487.python-list@python.org>
	<pan.2009.02.02.00.31.39@REMOVE.THIS.cybersource.com.au>
	<mailman.8560.1233544309.3487.python-list@python.org>
	<87myd51ouw.fsf@benfinney.id.au>
Message-ID: <7a9c25c20902020023kdb4e97eh16137c078fd64a8@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney
<bignose+hates-spam at benfinney.id.au> wrote:
> rdmurray at bitdance.com writes:
>
>> I don't even see Stephen Hansen's posts. My newsreader just shows
>> the header and says "[HTML part not displayed]".
>
> Likewise.

Yeah, I know HTML is bad on newsgroups. I didn't realize that when I
installed FireGPG to sign messages while in Gmail that it started
handling my html/plain text content differently.

Oops.

That said: Is S/MIME / OpenPGP readable on these various clients?
There's no HTML, the text body is just encoded in base64.

I haven't actually subscribed to a usenet newsgroup in eons upon eons.

If its not readable as S/MIME then I'll switch to inline PGP... that's
just a slightly terrible solution for other places I have to talk and
I'll have to take extra care to remember to manually check the
settings based upon where I'm talking.

I'm re-sending this same message as the OpenPGP S/MIME attachment
format -- just so test if its actually readable by news clients in
general. I have absolutely no idea. Not touched a news client in years
and years, as I said.

Sorry for the inconvenience.

--Stephen


From apt.shansen at gmail.com  Mon Feb  2 03:24:19 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:24:19 -0800 (PST)
Subject: Membership of multiple items to a list
In-Reply-To: <87myd51ouw.fsf@benfinney.id.au>
Message-ID: <fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>

On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney <bignose+hates-spam at benfinney.id.au> wrote:
> rdmurray at bitdance.com writes:
>
>> I don't even see Stephen Hansen's posts. My newsreader just shows
>> the header and says "[HTML part not displayed]".
>
> Likewise.

Yeah, I know HTML is bad on newsgroups. I didn't realize that when I installed FireGPG to sign messages while in Gmail that it started handling my html/plain text content differently.

Oops.

That said: Is S/MIME / OpenPGP readable on these various clients? There's no HTML, the text body is just encoded in base64.

I haven't actually subscribed to a usenet newsgroup in eons upon eons. 

If its not readable as S/MIME then I'll switch to inline PGP... that's just a slightly terrible solution for other places I have to talk and I'll have to take extra care to remember to manually check the settings based upon where I'm talking.

I'm re-sending this same message as the OpenPGP S/MIME attachment format -- just so test if its actually readable by news clients in general. I have absolutely no idea. Not touched a news client in years and years, as I said.

Sorry for the inconvenience. 

--Stephen
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From nospam at nospam.com  Mon Feb  2 03:29:24 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 02 Feb 2009 09:29:24 +0100
Subject: [2.5.1] Comparing dates?
Message-ID: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>

Hello

	I have data in an SQL database where one column contains a date
formated as DD/MM/YYYYY.

I need to select all rows where the date is before, say Feb 1st 2009,
ie. 01/02/2009.

Is there a command in Python that does this easily, or should I look
into whatever date() function the SQL database offers?

Thank you.


From taskinoor.hasan at csebuet.org  Mon Feb  2 03:42:34 2009
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 2 Feb 2009 14:42:34 +0600
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>
	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>
	<7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
Message-ID: <79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>

On Mon, Feb 2, 2009 at 1:58 PM, Stephen Hansen <apt.shansen at gmail.com>wrote:

> On Sun, Feb 1, 2009 at 11:43 PM, Taskinoor Hasan
> <taskinoor.hasan at csebuet.org> wrote:
> > Can anyone explain what is the necessity of executing whole script when
> > importing. Isn't it enough to just put the module name in the namespace
> and
> > execute when some function is called?
>
> I'm not sure if I'm going to explain this right-- so bear with me.
>
> The code:
>
>    def something(other):
>        return other + 1
>
> Doesn't exist until that def statement is executed. "def", "class" and
> such are not magical and immediately register something somewhere. Its
> a statement that has to be executed to get a result, and that result
> is bound as an assignment to the name specified.
>
> Its not really all that different from:
>    something = lambda other: other + 1
>
> It can't pick through the top level instructions to determine what to
> execute if imported vs run, as every statement has the possibility of
> producing some binding of name to value and until you go and execute
> it you won't know. You may do something like:
>
>    try:
>        import blah
>    except:
>        blah = None
>
> You have to execute all of that to get a value for 'blah'. In Python,
> there's nothing really special about a function vs any other value.
> They are all objects that are assigned to a name in a given namespace.
> You can do dynamic things at the top level to result in different
> things being bound to the modules namespace based upon the statements
> and expressions evaluated.
>
> Does that make sense? If not someone else'll have to explain :)


It make sense :-).  So my reasoning......let A is imported in B, i.e. name A
is put in B's namespace. When we call something like A.a then the
interpreter first resolve A in B's namespace, then to get a, it need to look
up A's namespace. And there is no way to populate A's namespace without
executing A, and as all statements, including 'def', 'class' etc., are
treated in the same way, whole script need to be executed.

So whether a script can be imported as module or not is mainly dependent on
how the script is written and largely on the intention of the coder.

>
>
> --Stephen
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From raykyoto at gmail.com  Mon Feb  2 03:53:54 2009
From: raykyoto at gmail.com (Ray)
Date: Mon, 2 Feb 2009 00:53:54 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<mailman.8572.1233559153.3487.python-list@python.org>
	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>
	<mailman.8573.1233560219.3487.python-list@python.org>
Message-ID: <0b9638e5-3e23-42c1-b358-0037944abe5b@s1g2000prg.googlegroups.com>


Hi Stephen and everyone,


On Feb 2, 4:36?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > Maybe he can wrap the things he dont need inside
> > if __name__ == '__main__':
> > check.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> Yeah but he said he doesn't want to modify the file itself-- if he can
> modify the file this can all go away readily, yes.


Thank you for your posts and your explanations; and yes, as you
(Stephen) said here, I'd prefer not to modify it and use it as-is.
Ideally, the original author could have separated the functions from
the top-level code and I would just import the module with the
functions.  But that's whining since the hard work of writing the
functions was already done and I'm very grateful for it; likewise, I'd
like to use of the module unchanged.

As there is no way around it, I'll look into ways of minimizing the
number of changes and the "if" statement mentioned by Kottiyath would
be my next step.  Thank you all for the replies!

Ray




From apt.shansen at gmail.com  Mon Feb  2 03:55:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 00:55:36 -0800
Subject: is python Object oriented??
In-Reply-To: <018801c9850e$3e019fe0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
Message-ID: <7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>

>>
>> You, sir, should be programming in some language other than Python.
>
> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a
> whole system without hiding a single item.
> Conversely, the lack of data hiding is perceived as a weakness,
> and IMO harms the advocacy of the language -

This is an alarming statement.

Advocacy should advocate the language-- it must not define the language.

If a fundamental principle of the language harms the advocacy of the
language: then the problem is not with the language but the advocacy.
If you are going to advocate a thing: advocate that thing. Don't try
to change that thing into what it is not so as to make your advocacy
the end-goal.

One of the reasons I love Python is because its practical first. It
begins with its license, which some people argue allows companies to
steal effort from its developers to use for their own purposes without
contributing back. The Python license is about empowering people to
accomplish things, to do things. It goes further. Guido and the core
developers ask real questions: would this add a burden to practical
use, or would it hinder another practical use?


> This is proven
> by your statement above, whereby you are driving a user away,
> simply because the language, in one small aspect, does not
> give him what he wants, and the tenor of this thread has been
> very much: "That's how it is - like it or lump it", and no amount
> of careful explanation of why people want the feature has cut
> any ice -

I'm missing the careful explanation. What I've heard is that the lack
of enforced encapsulation is "a danger". What I've heard is that
people want it because they've been told they should want it and
believe that. Why?

Part of my lack of understanding might be because people couldn't read
my previous messages because my mail client's configuration
accidentally got fubar'd and I was sending HTML mail instead of plain
text. But my question remains: Why do you need forced encapsulation?

There have been no "careful explanations" to answer that, in my mind.
And thus my response is: the practical possibility of needing access
vastly outweights the theoretical situation that might go bad if
encapsulation wasn't there. Why? Because in any real situation, IMHO,
*forced* encapsulation is pointless.

If you are writing end-level code, you can achieve forced
encapsulation by simply not playing with anyones privates. If you are
in a corporate environment who has rules about accessing privates
written by another team for valid reasons, your policy to not do so
should be enough or your review process should pick it up. If you are
in an open source environment accepting patches from various people,
you should have a clear policy about the subject if you think breaking
encapsulation is never acceptable and refuse the patches. Those who
have commit access and violate encapsulation anyways against your
projects policy are problems that you clearly need to deal with. The
problem is not the language at that point, its the contributor.


> It has all the time been countered with statements
> about how the proponents of private attributes "don't need it",
> (as if they are plain dumb),

They don't need it. No one has shown a *real* reason why. The only
reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
That's not a real reason. If its your project that someone is doing
bad in, this is a situation which can be *clearly* specified in a
projects policy and coding standards and can be *trivially* tested for
with simple static analysis in nearly all cases. The problem is the
person and not the code then. There's *countless* other ways that
person can do bad if you're allowing them to commit blindly anything
into your project.

If its your projet which someone else is using, and accessing your
internals that are clearly private and not documented: its not your
problem if they stab themselves in the foot. On the contrary, why in
the name of all that is holy, do you care if they manipulate your
internals at their own risk, at their own cost, and achieve something
positive for them? How in any way does this hurt you?


>  that an underscore convention is
> "just as good", (It isn't),

Why isn't it?

> that you could crack it if you really
> tried, (so what?),

Exactly.. so what? WHY is the convention not enough? What REAL
situation is there that the lack of *forced* encapsulation but policy
based encapsulation not enough?

> Surely if "we are all adults here" we have to accept that the
> other man has as much right to get what he wants, as
> anybody else, and that his reasons are as valid as those of
> anybody else.

Yes., We're all consenting adults.

But if one adult decides to make rules that the other doesn't agree
to, is that consenting adults, or is that rape? I apologize for the
use of the term, but "consenting adults" has particular connotations
that seem to apply very well here, in the context of that expression.

Forced encapsulation allows one party to make absolute rules and hold
absolute authority over another party.

If you believe that encapsulation should never be broken: do not break it.

If your organization, corporation or project believes that
encapsulation should never be broken: specify that it must not be
done. Your review process (you do have one, right?) will pick it up
and you can very quickly deal with the situation.

Encapsulation is a very, very good thing in general: but it is a
question of *design* and not *implementation*.  Python allows EVERYONE
who wants encapsulation to HAVE it. Not forced encapsulation, but
encapsulation. If you're producing a product in Python on your own
simple policy and trivial review (even -automated- review; it is NOT
hard to tell that "other._private" is not "self._private") provides
encapsulation.  If you're making a library for others to use, there is
no valid reason for you to care if they screw with your internals.

Really. I just don't get the problem. It seems to me that people who
want this in Python will never be happy *in* Python. Its a very deep
fundamental feature that Python exposes everything it can, even things
that are potentially dangerous like sys._getframe. Recently on
Python-dev(note: I only lurk) someone was working on a debugger and
they were told in that situation it was OK to access a private member
of sys to achieve an end: exposing that internal to general use just
had no value. That's the Python Way. People can dig into things,
classes, functions, and screw around in wild ways if they want to.
That *is* what Python is. 95% of code by 95% of people won't ever go
there, but its there. To remove it means its *not* Python.

--S


From rNOSPAMon at flownet.com  Mon Feb  2 03:59:16 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Mon, 02 Feb 2009 00:59:16 -0800
Subject: Extreme Yaro weirdness
Message-ID: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>

I'm running the following WSGI app under Yaro:

def error(req):
  try:
    req.non_existent_key
  except:
    try:
      return cgitb.html(sys.exc_info())
    except:
      return 'foo'

The result of running this is 'foo'.  In other words, the reference to 
the non-existent key generates an exception as expected, but then the 
generation of the traceback generates ANOTHER exception, which I would 
not have expected.  If I add another TRY/EXCEPT block to capture this 
exception, the result is attached at the bottom of this message.

It gets better.

I get the same result whether I run under Apache/mod_wsgi or standalone 
using wsgi_ref.  But if I add the following code to try to capture a 
Yaro request object so I can noodle around with it:


def error(req):
  global req1
  req1=req
  try: ...


it makes the problem go away!  But it ONLY makes the problem go away 
when running under wsgi_ref, not under Apache!

The problem seems to be specific to Yaro.  If I make an instance of an 
object and try to dereference a non-existent attribute, the initial 
traceback gets generated with no problem.  Also, the Yaro code for 
Request.__getattr__ ultimately calls req.__dict__[attr].  If I make this 
call directly, the problem also goes away.

I am quite baffled by this.  Any suggestions on how to debug this would 
be much appreciated.

Thanks,
rg


----


<type 'exceptions.KeyError'>
Python 2.5: /usr/local/bin/python
Mon Feb  2 00:54:33 2009

A problem occurred in a Python script.  Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /www/sites/mcia.cc/files/wsgi/test.wsgi in error(req=<yaro.Request 
object at 0x2aaaab94a690>)
  212   except:
  213     try:
  214       return cgitb.text(sys.exc_info())
  215     except:
  216       try:
global cgitb = <module 'cgitb' from '/usr/lib/python2.5/cgitb.pyc'>
cgitb.text = <function text at 0x2aaaab0adc80>
global sys = <module 'sys' (built-in)>
sys.exc_info = <built-in function exc_info>

 /www/sites/cgitb.py in text((etype=<type 'exceptions.KeyError'>, 
evalue=KeyError('non_existent_key',), etb=<traceback object at 
0x2aaaab960368>), context=5)
  215             try: return linecache.getline(file, lnum[0])
  216             finally: lnum[0] += 1
  217         vars = scanvars(reader, frame, locals)
  218 
  219         rows = [' %s %s' % (file, call)]
builtinvars = <built-in function vars>
global scanvars = <function scanvars at 0x2aaaab0adb90>
reader = <function reader at 0x2aaaabbbea28>
frame = <frame object at 0xba49e0>
locals = {'req': <yaro.Request object at 0x2aaaab94a690>}

 /www/sites/cgitb.py in scanvars(reader=<function reader at 
0x2aaaabbbea28>, frame=<frame object at 0xba49e0>, locals={'req': 
<yaro.Request object at 0x2aaaab94a690>})
   82             if lasttoken == '.':
   83                 if parent is not __UNDEF__:
   84                     value = getattr(parent, token, __UNDEF__)
   85                     vars.append((prefix + token, prefix, value))
   86             else:
value = <yaro.Request object at 0x2aaaab94a690>
builtingetattr = <built-in function getattr>
parent = <yaro.Request object at 0x2aaaab94a690>
token = 'non_existent_key'
__UNDEF__ undefined

 /www/sites/mcia.cc/files/wsgi/yaro.py in __getattr__(self=<yaro.Request 
object at 0x2aaaab94a690>, attr='non_existent_key')
  215         elif attr == 'cookie' and not 'cookie' in self.__dict__:
  216             self._load_cookie()
  217         return self.__dict__[attr]
  218 
  219     def _parse_query(self):
self = <yaro.Request object at 0x2aaaab94a690>
self.__dict__ = {'_start_response': <built-in method start_response of 
mod_wsgi.Adapter object at 0x2aaaaab218a0>, 'content_length': '', 
'content_type': '', 'environ': {'DOCUMENT_ROOT': 
'/www/sites/mcia.cc/html', 'GATEWAY_INTERFACE': 'CGI/1.1', 
'HTTP_ACCEPT': 
'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plai
n;q=0.8,image/png,*/*;q=0.5', 'HTTP_ACCEPT_ENCODING': 'gzip, deflate', 
'HTTP_ACCEPT_LANGUAGE': 'en-us', 'HTTP_CACHE_CONTROL': 'max-age=0', 
'HTTP_CONNECTION': 'keep-alive', 'HTTP_COOKIE': 'sid=55UGS64T', 
'HTTP_HOST': 'mcia.cc', 'HTTP_REFERER': 'http://mcia.cc/wtest/menu', 
...}, 'exc_info': None, 'extra_props': None, 'method': 'GET', 'query': 
{}, 'res': <yaro.Response object at 0x2aaaab94a710>, 
'start_response_called': False, ...}
attr = 'non_existent_key'
<type 'exceptions.KeyError'>: 'non_existent_key'

The above is a description of an error in a Python program.  Here is
the original traceback:

Traceback (most recent call last):
  File "/www/sites/mcia.cc/files/wsgi/test.wsgi", line 214, in error
    return cgitb.text(sys.exc_info())
  File "cgitb.py", line 217, in text
    vars = scanvars(reader, frame, locals)
  File "cgitb.py", line 84, in scanvars
    value = getattr(parent, token, __UNDEF__)
  File "/www/sites/mcia.cc/files/wsgi/yaro.py", line 217, in __getattr__
    return self.__dict__[attr]
KeyError: 'non_existent_key'


From pranny at gmail.com  Mon Feb  2 04:05:59 2009
From: pranny at gmail.com (pranav)
Date: Mon, 2 Feb 2009 01:05:59 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
Message-ID: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>

Hi Folks,

I am designing a project for Windows XP/Vista, one part of which is a
background process that monitors internet connections. If the user
tries to connect to any particular site, say myDummySite.com in then
some actions are taken, based on fixed policies.
This can be thought of a mini firewall.

I am sure there must be some good libraries for this purpose. I need
the names of those libraries.

Thanks,

Pranav Prakash


From bignose+hates-spam at benfinney.id.au  Mon Feb  2 04:06:02 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 02 Feb 2009 20:06:02 +1100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
Message-ID: <87bptl1a4l.fsf@benfinney.id.au>

Gilles Ganault <nospam at nospam.com> writes:

> 	I have data in an SQL database where one column contains a
> date formated as DD/MM/YYYYY.
> 
> I need to select all rows where the date is before, say Feb 1st
> 2009, ie. 01/02/2009.

The Python data types for date and time are in the ?datetime? module
<URL:http://www.python.org/doc/2.6/library/datetime>. Create a
?datetime? object for each value you want, then compare them.

To create a ?datetime? value from a string, use ?datetime.strptime?
(new in Python 2.5).

-- 
 \                            ?Holy knit one purl two, Batman!? ?Robin |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From sjmachin at lexicon.net  Mon Feb  2 04:17:32 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 01:17:32 -0800 (PST)
Subject: Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
Message-ID: <712e7c7b-4728-4e43-acad-bd80e9598dae@z27g2000prd.googlegroups.com>

On Feb 2, 7:29?pm, Gilles Ganault <nos... at nospam.com> wrote:
> Hello
>
> ? ? ? ? I have data in an SQL database where one column contains a date
> formated as DD/MM/YYYYY.
>
> I need to select all rows where the date is before, say Feb 1st 2009,
> ie. 01/02/2009.
>
> Is there a command in Python that does this easily, or should I look
> into whatever date() function the SQL database offers?

It would help if you told us:
(1) Which database software
(2) What type that column was declared to be in the CREATE TABLE
statement
(3) Whether you have used the Python DB API on a database before
(4) Whether you have used a stand-alone SQL query tool on a database
before
(5) How you came to the conclusion that one column contains a date
formatted as dd/mm/yyyy ... Only one? Are there other date-containing
columns in the same table or other tables in the database? If so, how
are they formatted?

Basically, you are going to have to execute some SQL like:
   SELECT * FROM the_table WHERE the_date  < '2009-02-01'
which a reasonable chance of being syntactically valid and giving the
correct answer, if the column type is DATETIME/DATE/TIMESTAMP/similar.
If it's CHAR/VARCHAR/TEXT/CHARACTER/similar, then it's going to be
harder, and will depend on what database software it is.

A really silly question: have you asked the database administrator
(DBA)?


From adelle at akemi.com.au  Mon Feb  2 04:25:41 2009
From: adelle at akemi.com.au (Adelle Hartley)
Date: Mon, 02 Feb 2009 20:25:41 +1100
Subject: English-like Python
In-Reply-To: <49773E43.3050101@strout.net>
References: <1232067775.15931.25.camel@localhost>	<mailman.7483.1232288138.3487.python-list@python.org>	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>	<49761EE6.4070306@strout.net>
	<gl62md$hbg$1@ger.gmane.org>	<mailman.7651.1232507792.3487.python-list@python.org>	<5ea322bb-86f9-4b5c-94ec-e53e2f7cf193@r15g2000prh.googlegroups.com>
	<49773E43.3050101@strout.net>
Message-ID: <4986BC15.6030703@akemi.com.au>

Joe Strout wrote:
 > Aaron Brady wrote:
 >
 >> Where functions are first-class objects, a bare function object isn't
 >> distinguishable either from its call.
 >
 > That depends not on whether functions are first-class objects, but on
 > the *syntax* of function invocation vs. function reference.  It just so
 > happens than in Python, the syntax for the latter is the bare function
 > identifier.  But it wouldn't have to be -- you could use "@foo" or
 > "{foo}" or "ref foo" or (as in RB) "AddressOf foo" or any number of
 > other alternatives to accomplish the same thing, and functions would
 > still be first-class objects.
 >
 > I'll grant that having any such syntax makes them *odd* first-class
 > objects, since all other objects are referred to with a naked
 > identifier, and invoked (if they are callable) with some other syntax.
 > It'd be weird and inconsistent to have functions turn that around.  But,
 > despite being inconsistent, it might still be sensible, based on the
 > observation that we generally need to invoke methods a lot more often
 > than we need to get a reference to them.

I propose the following syntax for invoking foo:

Computer, please foo that for me.

I know Jean Luc would just say "Computer, foo that" but I think that 
just because it's a computer doesn't mean we shouldn't be polite.

I have found English-like syntax to be useful in filtering sets.

Eg.

   parents = people.that.have.children

This looks nicer (at least to my eye) in languages that don't require 
parentheses everywhere, but that's entirely superficial.

One way that I've thought it might be possible to avoid the problem of 
ambiguity in identifying parameters is to not use them.

For example, instead of

   display(people.that.have.children)

why not

   display.people.that.have.children

or even

   display.a.list.of.people.that.have.children

I think this could only work within a confined domain, since "display" 
needs to know about all of the things that could be displayed.

Regarding ambiguities.  The way NL users resolve them is often to ask 
their interlocutor for clarification.  The problem for a program is that 
the programmer isn't around to answer questions when the answer is 
needed most - the problem of programming is in defining the desired 
behavior ahead of time.

If we are ever to use English as a programming language, I think the 
"compiler" would need to ask us clarifying questions at compile time and 
amend or annotate the source based on our answers.

The resulting source code may be a rarefied version of English or more 
like a "traditional" programming language, but our primary means of 
communicating with the computer could be more natural.

Back in the 90's I used to say things to my computer like

   Computer, please Label this command button "Parents".

I don't think it much of a stretch to have it respond to

   When the user clicks this button, bring up a list of all the people 
that have children.

by generating the code

   display.a.list.of.people.that.have.children

and to attach it to the right event.

But even that level of apparent naturalness belies a problem that other 
posters in this thread have already raised:  There are so many ways of 
saying the same thing, yet the computer will only ever understand a 
subset of them, making it harder to learn the "natural" system than any 
artificial programming language.

I had at one time defined a number of voice commands for designing a form:

   Place a <control> here.
   Place a <control> <to the left of|to the right of|above|below> <this 
control|<control name> >
   Move that <up|down|left|right> <number pixels|a bit|slightly>
   ...

Once I "got into it" I was pretty productive with it, but the experience 
is not unlike playing with text-based adventure games for the first time.

That is, you know what you want the program to do, but you either don't 
know how to say it in a way that the program will understand or you know 
the program well enough to know that there is no way of directly 
representing what you want to do within the program's narrow grasp of 
English.

I don't think the problem is fundamentally unsolvable, only that the 
scale of the problem is quite large, like writing a dictionary.

Adelle.





From s.selvamsiva at gmail.com  Mon Feb  2 04:29:27 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 2 Feb 2009 14:59:27 +0530
Subject: importing module-performance
Message-ID: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>

Hi all,
I have a small query,
Consider there is a task A which i want to perform.

To perform it ,i have two option.
1)Writing a small piece of code(approx. 50 lines) as efficient as possible.
2)import a suitable module to perform task A.


I am eager to know,which method will produce best performance?
-- 
Yours,
S.Selvam
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From clp2 at rebertia.com  Mon Feb  2 04:37:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 01:37:08 -0800
Subject: Exception error when accessing the class variable at the 
	termination of the program
In-Reply-To: <e244ddfd13312.4986eca3@vsnl.net>
References: <e244ddfd13312.4986eca3@vsnl.net>
Message-ID: <50697b2c0902020137h7afabb1bt56dbea34a8db6246@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:52 PM,  <jwalana at vsnl.net> wrote:
> Hi All,
>
>   Here is a sample piece of code with which I am having a problem, with Python version 2.4.4
>
> class Person:
>    Count = 0   # This represents the count of objects of this class
>
>    def __init__(self, name):
>        self.name = name
>        print name, ' is now created'
>        Person.Count += 1
>
>    def __del__(self):
>        print self.name, ' is now deleted'
>        Person.Count -= 1
>        if Person.Count == 0:
>            print 'The last object of Person class is now deleted'
>        else:
>            print 'There are still', Person.Count, ' objects of class Person'
>
> x2 = Person("Krishna")
> del x2
>
>  When the above code is executed, it works properly.
>
>  If the last statement del x2, is removed, then when the program terminates, this throws up an exception as shown below
>
> Krishna  is now created
> Krishna  is now deleted
> Exception exceptions.AttributeError: "'NoneType' object has no attribute 'Count'
> " in <bound method Person.__del__ of <__main__.Person instance at 0xf6532f6c>> ignored
>
>  Can someone please explain why the exception happens in the case where there is no explicit del statement?

Without the `del`, the reference count of x2 remains >0 and so is not
deleted until the program ends. This affects when __del__ is executed,
which matters greatly.

>From the section on __del__ on
http://www.python.org/doc/2.3.5/ref/customization.html :
Warning: Due to the precarious circumstances under which __del__()
methods are invoked, exceptions that occur during their execution are
ignored, and a warning is printed to sys.stderr instead. Also, when
__del__() is invoked in response to a module being deleted (e.g., when
execution of the program is done), ***other globals referenced by the
__del__() method may already have been deleted***. For this reason,
__del__() methods should do the absolute minimum needed to maintain
external invariants. [etc., emphasis mine]

Since without the `del`, __del__ is only called at the end of the
program, Person and/or Count may have already been GC-ed by the time
__del__ is called (the order objects are GC-ed in is a bit
unpredictable), hence the error you get which is saying, in a slightly
obtuse way, that Person has been GC-ed already.
As the Warning states, __del__ shouldn't be relied upon to do fancy
stuff like you're having it do. You would be better off using an
explicit finalizer method in this case, like .close() for file
objects.

For example:

try:
    x2 = Person("Krishna")
    #do stuff with x2
finally:
    x2.delete() #causes count to be decremented

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From duncan.booth at invalid.invalid  Mon Feb  2 04:37:21 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 2 Feb 2009 09:37:21 GMT
Subject: Exception error when accessing the class variable at the
	termination of the program
References: <mailman.8585.1233565087.3487.python-list@python.org>
Message-ID: <Xns9BA661D12A12Dduncanbooth@127.0.0.1>

jwalana at vsnl.net wrote:

>  Can someone please explain why the exception happens in the case
>  where there is no explicit del statement? 

When Python is ecleaning up as it exits, it clears all the global 
variables in each module by setting them to None. This happens in an 
arbitrary and unpredictable order: in this particular case it set Person 
to None before setting x2 to None.

If you must have a __del__ method on a class then you should take care 
not to access any globals from inside the __del__ method (or any 
function it calls). Alternatively you could just catch and ignore any 
exceptions thrown from your __del__ method.

In the example you gave, provided you never subclass Person you could 
use self.__class__.Count to access your class variable. However in many 
cases you'll probably find that a much better solution is to use weak 
references. e.g. a WeakValueDictionary mapping id(self) to self:

from weakref import WeakValueDictionary

class Person:
    _instances = WeakValueDictionary()

    def __init__(self, name):
        self.name = name
        self._instances[id(self)] = self
        print name, 'is now created'

    @property
    def Count(self):
        return len(self._instances)

    def __del__(self):
        print self.name, 'is now deleted'
        if self.Count==0:
            print 'The last object of Person class is now deleted'
        else:
            print 'There are still', self.Count, 'objects of class 
Person'

x2 = Person('Krishna')
# del x2


-- 
Duncan Booth http://kupuguy.blogspot.com


From clp2 at rebertia.com  Mon Feb  2 04:41:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 01:41:45 -0800
Subject: importing module-performance
In-Reply-To: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
References: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
Message-ID: <50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>

On Mon, Feb 2, 2009 at 1:29 AM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
> I have a small query,
> Consider there is a task A which i want to perform.
>
> To perform it ,i have two option.
> 1)Writing a small piece of code(approx. 50 lines) as efficient as possible.
> 2)import a suitable module to perform task A.
>
>
> I am eager to know,which method will produce best performance?

A. Your question seems much too vague to answer.
B. Premature optimization is the root of all evil. In all likelihood,
the time taken by the `import` will be absolutely trivial compared to
the rest of the script, so don't bother micro-optimizing ahead of
time; write readable code first, then worry about optimization once
it's working perfectly.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From banaouas.medialog at wanadoo.fr  Mon Feb  2 04:46:41 2009
From: banaouas.medialog at wanadoo.fr (m.banaouas)
Date: Mon, 02 Feb 2009 10:46:41 +0100
Subject: ElementTree and clone element toot
Message-ID: <4986bfd7$0$9385$ba4acef3@news.orange.fr>

Hi all,
Working with the ElementTree module, I looked for clone element function but not
found such tool:

def CloneElment(fromElem, destRoot = None)
fromElem is the element to clone
destRoot is the parent element of the new element ; if None so the new element
will be child of fromElem parent. The clone operation is recursive to make it
process all subtree of the element to clone.

here is my first implementation:

def CloneElement(fromElem, destRoot = None):
  if destRoot == None:
    fromRoot = ET.ElementTree(fromElem).getroot()
    destRoot = fromRoot
  destElem = destRoot.makeelement(fromElem.tag, fromElem.attrib)
  destRoot.append(destElem)
  destElem.text = fromElem.text
  for e in fromElem.findall('*'):
    CloneElement(e, destElem)
#
this function works fine only if destRoot parameter is defined by the caller
context. The problem is about retreiving parent element: I didn't found any way
to determine the parent element of an element "elem" by asking elem itself!
and ET.ElementTree(fromElem).getroot() is wrong because it returns fromElem
itself, not its parent.

Thanks for any help.


From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 04:59:59 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 10:59:59 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8486.1233440218.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<mailman.8269.1233224761.3487.python-list@python.org>	<mn.eb167d9187521ecb.46195@XX.XmclaveauX.com>	<873af1vkgn.fsf@benfinney.id.au>	<mn.fada7d9198c350e2.46195@XX.XmclaveauX.com>	<gm1ibs$994$1@ger.gmane.org>
	<mailman.8486.1233440218.3487.python-list@python.org>
Message-ID: <4986c41f$0$3659$426a34cc@news.free.fr>

Michael Torrie a ?crit :
> Steve Holden wrote:
>> You can think what you like, but there is a fundamental difference
>> between methods of a class and functions of a module. Until you
>> appreciate that you will likely make mistakes. Don't worry, though, we
>> all learn from our mistakes.
> 
> And this fundamental difference is?

That a method is bound to a class and (usually) an instance of this class.

> From what I can tell an instance method is an object that encapsulates
> the function object in a closure

s/closure/object/

> that makes sure it has a reference to
> "self." 

the method object is instanciated by the function object itself when it 
is looked up upon a class or instance (thanks to the descriptor 
protocol). It (the method object) stores the function, the class and (if 
bound) the instance as attributes, and it's __call__ method takes care 
of calling the function with the instance as first positional argument.

> I know that you dynamically add functions to objects creating
> methods dynamically, by using new.instancemethod or something.

Or simply by manually invoking the descriptor protocol:


def func(self):
    print "self is", self

class Foo(object):
    pass

f = Foo()
f.func = func.__get__(f, type(f))

print dir(f.func)

> 
> This seems to indicate to me that there are functions and there are
> functions.  Methods are in fact functions, just with a callable wrapper
> around them.

Methods *are* the callable wrapper around functions - so they can't be 
functions themselves. From this POV, the functions wrapped by methods 
are actually the *implementation* of the method.



From ove.svensson at jeppesen.com  Mon Feb  2 05:01:12 2009
From: ove.svensson at jeppesen.com (Ove Svensson)
Date: Mon, 02 Feb 2009 11:01:12 +0100
Subject: Get thread pid
References: <1f4ff371-447d-4eca-8c51-e73eb10ed8c5@a12g2000pro.googlegroups.com>
	<mailman.8396.1233348060.3487.python-list@python.org>
	<31508b6d-bebb-45e6-b57c-525d370e22c0@r37g2000prr.googlegroups.com>
Message-ID: <9g8wopuphz.fsf@overberg.jeppesensystems.com>

Alejandro <alejandro.weinstein at gmail.com> writes:

> On Jan 30, 1:40?pm, Christian Heimes <li... at cheimes.de> wrote:
>> May I ask why you want to get the TID?
>
> htop shows the TID of each thread. Knowing the TID allows me to know
> which thread is hogging the CPU. If there is a better way to do this,
> or there is something fundamentally wrong with this approach, please
> let me know.
>
> Alejandro.

Assuming we are talking about a  posix (pthread) architecture, 
you can't really say anything about the thread id (TID). Pthreads
identifies each thread with the anonymous type pthread_t. If you
want to write a portable application, you must not assume anything
regarding the real type. It could be an integer, pointer, struct
or something else. Just because some operating systems use an
integer for the pthread_t doesn't mean that others do the same.

It is true that the operating system must have some way to identify
each thread (within each process), but it is not visible or accessible
to the application.

If you have a threading *framework* on top of pthreads, which uses 
some TID, that is then either purely an artificial id or a non-portable 
architecture specific access to the operating system id. For example,
python thread.get_ident() returns the `thread identifier' of the 
current thread. That TID can be *anything*. You must not assume that
id has any meaning (other than being unique per thread). The python
class threading.Thread has methods setName() and getName() for
setting and fetching the *name* of a thread. That is a pure application
name and has nothing to do with the id used by the operating system.

The reason that python modules thread and threading doesn't return
any real TID is simply that there isn't any TID that it can return.
At least not in any portable way.

If you find a way to get to the real TID, that will be specific to
your architecture.

If htop (or any other application) returns a TID, that is either
artificial or architecture specific.



From clp2 at rebertia.com  Mon Feb  2 05:01:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 02:01:45 -0800
Subject: how to create data to dump into yaml file
In-Reply-To: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>
References: <37638.203.200.218.112.1233560515.INFOTECHENTL@webmail.infotechsw.com>
Message-ID: <50697b2c0902020201p3ce5879bnd9bf1c10ec6d0756@mail.gmail.com>

On Sun, Feb 1, 2009 at 11:41 PM,  <sibteym at infotechsw.com> wrote:
> hi
>    I have to create a yaml file using my list of objects.shall i need to
> create a string using my objects and then load and dump that string or
> is there any other way to create the yaml file.
>
> i want a yaml file to be created from [Text, Author,......]in this format
> Text:
>    - value1
>    - value2
>    - value 3
> Author:
>     name: bookName

The PyYAML library is available on http://pyyaml.org/
Also, since JSON is essentially a subset of YAML, you could use the
`json` module (http://docs.python.org/library/json.html) in the Python
std lib, albeit with differently formatted results.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From s.selvamsiva at gmail.com  Mon Feb  2 05:11:56 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 2 Feb 2009 15:41:56 +0530
Subject: importing module-performance
In-Reply-To: <50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>
References: <b423b9550902020129p16da8fbamcf3efbe79d1a0c22@mail.gmail.com>
	<50697b2c0902020141i35e3acd6y4bbd40f75fc89244@mail.gmail.com>
Message-ID: <b423b9550902020211q14da5674w8ea0db345448d018@mail.gmail.com>

On Mon, Feb 2, 2009 at 3:11 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Feb 2, 2009 at 1:29 AM, S.Selvam Siva <s.selvamsiva at gmail.com>
> wrote:
> > Hi all,
> > I have a small query,
> > Consider there is a task A which i want to perform.
> >
> > To perform it ,i have two option.
> > 1)Writing a small piece of code(approx. 50 lines) as efficient as
> possible.
> > 2)import a suitable module to perform task A.
> >
> >
> > I am eager to know,which method will produce best performance?
>
> A. Your question seems much too vague to answer.
> B. Premature optimization is the root of all evil. In all likelihood,
> the time taken by the `import` will be absolutely trivial compared to
> the rest of the script, so don't bother micro-optimizing ahead of
> time; write readable code first, then worry about optimization once
> it's working perfectly.
>
> Cheers,
> Chris
> --
> Follow the path of the Iguana...
> http://rebertia.com



Thank you Chris,

 I faced a optimization problem as follow,

For fuzzy string comparison initially i used 15 lines of code which compares
a word with 29,000 words in a list .For each set of words compared, the
15-line code produce number of differences characters of the two words.

But when i used python-levenshtein module for same reason it has run faster
than the old method.This invoked me to raise that query.

Now i understood that, it is not an issue of importing the module/writing
the code, but the problem must be with my 15-line code.


-- 
Yours,
S.Selvam
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From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 05:12:52 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 11:12:52 +0100
Subject: is python Object oriented??
In-Reply-To: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
Message-ID: <4986c724$0$10268$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :

(snip)

> Anyway, it doesn't matter. We're losing the point here. The point is
> that language support for private access, by disallowing user access
> to private data, provides an unambiguous information hiding mechanism
> which encourages encapsulation. Python's approach, however, which is
> only a naming convention rather than a language feature, merely TRUSTS
> the programmer not to break encapsulation. And sure, if we're all good
> programmers, everything will go well and we'll end up with an
> organized application. But the danger is still there: at any given
> time, we COULD break encapsulation!

Oh, my, What a shock! What a nightmare. Thanks, thanks thmpsn for 
opening our eyes. How can we have lived so many years with this 
permanent danger, and yet managed to write working, robust programs, I 
really wonder. Good God, we really need to fix this immediatly, because 
obviously, TRUSTING the programmer JUST CANT WORK.

Or can it ?

this-dead-horse-has-been-beaten-to-hell-and-back-pity-the-poor-animal-ly'yrs


From cd at okunah.de  Mon Feb  2 05:14:25 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 02 Feb 2009 11:14:25 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <gm6h0e$j07$2@svr7.m-online.net>

Hi,

> Just to register a contrary opinion: I *hate* syntax highlighting

With vim you simply don't turn it on. Would that be OK for you?

Christof



From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 05:15:24 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 11:15:24 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8546.1233531569.3487.python-list@python.org>
References: <73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<fqnyxwhlmav9duj08sUYAxe124vaj_firegpg@mail.gmail.com>	<4985DC6F.4030106@holdenweb.com>
	<mailman.8546.1233531569.3487.python-list@python.org>
Message-ID: <4986c7bc$0$10268$426a74cc@news.free.fr>

Rhodri James a ?crit :
> On Sun, 01 Feb 2009 17:31:27 -0000, Steve Holden <steve at holdenweb.com> 
> wrote:
> 
>> Stephen Hansen wrote:
>>> [...]
>>> don't play with anyone else's
>>> privates.
>>>
>> A good rule in life as well as programming.
> 
> Unless, of course, you're both consenting adults.
> 
> What?  Someone had to say it!
> 
Indeed. Thanks for this useful clarification !-)


From asmodai at in-nomine.org  Mon Feb  2 05:18:48 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 2 Feb 2009 11:18:48 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <531189.66795.qm@web36504.mail.mud.yahoo.com>
References: <531189.66795.qm@web36504.mail.mud.yahoo.com>
Message-ID: <20090202101848.GZ99614@nexus.in-nomine.org>

-On [20090201 15:18], Craig (fasteliteprogrammer at yahoo.com) wrote:
>eclipse

With the pydev plugin of course.

Personally I prefer to just use vim and (i)python. But at work I am using
Eclipse with pydev as well.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From thorsten at thorstenkampe.de  Mon Feb  2 05:36:48 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 11:36:48 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
Message-ID: <MPG.23f0eb2cf71f9dc39897b7@news.individual.de>

* Christof Donat (Mon, 02 Feb 2009 11:14:25 +0100)
> > Just to register a contrary opinion: I *hate* syntax highlighting
> 
> With vim you simply don't turn it on. Would that be OK for you?

No. Even the /possibility/ of having syntax highlighting would indicate 
wimpness and thus humiliate me.

Thorsten


From w.richert at gmx.net  Mon Feb  2 05:42:23 2009
From: w.richert at gmx.net (Willi Richert)
Date: Mon, 2 Feb 2009 11:42:23 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <20090202101848.GZ99614@nexus.in-nomine.org>
References: <531189.66795.qm@web36504.mail.mud.yahoo.com>
	<20090202101848.GZ99614@nexus.in-nomine.org>
Message-ID: <200902021142.23513.w.richert@gmx.net>

Hi,

I used eclipse/pydev quite some time. What pulled me back into the arms of 
emacs was:

 - ability to save bookmarks (meaning a point in  a file) at all the 
keystrokes. Never found out how to do that in eclipse. In emacs I have now all 
the times "j" save at the current working position, "f" at the last failure I 
have to work on, and so on.

- just faster then pydev. Once pydev tries to "understand" your python code 
(refactoring) you can go and get a coffee

- ecb, tabbar, psvn provide the same functionality of eclipse you use in 
everyday.

Of course, it takes some time to use emacs. But it pays back with a nice 
Python integration and the advantage to customize everything you want.

wr

On Montag, 2. Februar 2009 11:18:48 Jeroen Ruigrok van der Werven wrote:
> -On [20090201 15:18], Craig (fasteliteprogrammer at yahoo.com) wrote:
> >eclipse
>
> With the pydev plugin of course.
>
> Personally I prefer to just use vim and (i)python. But at work I am using
> Eclipse with pydev as well.


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From tino at wildenhain.de  Mon Feb  2 05:45:21 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 02 Feb 2009 11:45:21 +0100
Subject: key capture
In-Reply-To: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
References: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
Message-ID: <4986CEC1.6060209@wildenhain.de>

Hi,

swamynathan wrote:
> hello,
> im making a virtual piano in python where on key stroke a wav is played 
> from a location
> now to implement  a fully functional piano i need to have multiple key 
> stroke captures  ie if 2 or 3 keys pressed then the function which 
> playes the wav is called with 3 parameters


> how to implement this or any other suggestion(i was asked to try multi 
> threading which dint seem optimal)

Are you trying to do this with a computer keyboard or with an
attached midi or usb music keybord? If the former, you are probably
w/o luck because afaik there is no way to track the event
of having random keys pressed the same time.
(Last time I did it was with a real C=64 where you have access
  to the key matrix)

If you manage to receive the keypress events, multithreading is
probably easiest to do but it really depends on the way you
play the sounds - at least the playback needs to be asynchronously
so you can catch note-on, note-off events during playback.

Good luck
Tino
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From deets at nospam.web.de  Mon Feb  2 05:58:19 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 11:58:19 +0100
Subject: Problem With py2exe and ConfigParser
References: <8b776264-1a6f-4f75-9a06-2b68d908b2fe@p23g2000prp.googlegroups.com>
	<6um1i1FfqskrU1@mid.uni-berlin.de>
	<7fad9e49-df2e-46db-a3cc-6e5b9f55e773@q36g2000vbn.googlegroups.com>
Message-ID: <6uo1ubFgdclfU1@mid.uni-berlin.de>

berserker992 at gmail.com wrote:

> 
> You can set an example? My English is bad, so I do not quite
> understand

You need to give a proper path to the config.ini. It's not found, which most
probably occurs because you give a relative path ("config.ini") but that
doesn't work because the current working directory has a different value
from what it has when you run the problem differently.

So, you need to give a full path. 

Diez


From nospam at nospam.com  Mon Feb  2 06:07:18 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Mon, 02 Feb 2009 12:07:18 +0100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
Message-ID: <5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>

On Mon, 02 Feb 2009 20:06:02 +1100, Ben Finney
<bignose+hates-spam at benfinney.id.au> wrote:
>The Python data types for date and time are in the ?datetime? module
><URL:http://www.python.org/doc/2.6/library/datetime>. Create a
>?datetime? object for each value you want, then compare them.

Thanks guys. For those interested, here's how to perform the
conversion from DD/MM/YYYY to YYYY-MM-DD:

=====
import datetime

connection = datetime.datetime.strptime("21/02/2008",
"%d/%m/%Y").strftime("%Y-%m-%d")
print connection
=====


From mail at microcorp.co.za  Mon Feb  2 06:13:42 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 13:13:42 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
Message-ID: <003d01c98527$d9ea4ec0$0d00a8c0@hendrik>

"Stephen Hansen" <apt.shansen at gmail.com> wrote:



8<----------- arguments for the status quo ------
> 
> I'm missing the careful explanation. What I've heard is that the lack
> of enforced encapsulation is "a danger". What I've heard is that
> people want it because they've been told they should want it and
> believe that. Why?
> 
> Part of my lack of understanding might be because people couldn't read
> my previous messages because my mail client's configuration
> accidentally got fubar'd and I was sending HTML mail instead of plain
> text. But my question remains: Why do you need forced encapsulation?
> 
> There have been no "careful explanations" to answer that, in my mind.
> And thus my response is: the practical possibility of needing access
> vastly outweights the theoretical situation that might go bad if
> encapsulation wasn't there. Why? Because in any real situation, IMHO,
> *forced* encapsulation is pointless.
> 
> If you are writing end-level code, you can achieve forced
> encapsulation by simply not playing with anyones privates. If you are
> in a corporate environment who has rules about accessing privates
> written by another team for valid reasons, your policy to not do so
> should be enough or your review process should pick it up. If you are
> in an open source environment accepting patches from various people,
> you should have a clear policy about the subject if you think breaking
> encapsulation is never acceptable and refuse the patches. Those who
> have commit access and violate encapsulation anyways against your
> projects policy are problems that you clearly need to deal with. The
> problem is not the language at that point, its the contributor.
> 
> 
> > It has all the time been countered with statements
> > about how the proponents of private attributes "don't need it",
> > (as if they are plain dumb),
> 
> They don't need it. No one has shown a *real* reason why. The only

Repeating it, (despite my assertion lately in another thread) does not 
make it true - what follows is simply an opinion on how to solve
the problem "by management", instead of providing a different tool.

> reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> That's not a real reason. If its your project that someone is doing
> bad in, this is a situation which can be *clearly* specified in a
> projects policy and coding standards and can be *trivially* tested for
> with simple static analysis in nearly all cases. The problem is the
> person and not the code then. There's *countless* other ways that
> person can do bad if you're allowing them to commit blindly anything
> into your project.
> 
> If its your projet which someone else is using, and accessing your
> internals that are clearly private and not documented: its not your
> problem if they stab themselves in the foot. On the contrary, why in
> the name of all that is holy, do you care if they manipulate your
> internals at their own risk, at their own cost, and achieve something
> positive for them? How in any way does this hurt you?
> 
> 
> >  that an underscore convention is
> > "just as good", (It isn't),
> 
> Why isn't it?

Because it needs human intervention.

> 
> > that you could crack it if you really
> > tried, (so what?),
> 
> Exactly.. so what? WHY is the convention not enough? What REAL
> situation is there that the lack of *forced* encapsulation but policy
> based encapsulation not enough?
> 

See human intervention above - and as for 
"real, forced data hiding" - have you ever
coded anything that produced a segmentation fault?

I wonder why the designers of processors do such silly things as having
user and supervisor modes in the hardware - according to your
arguments a code review would solve the problem, and then they
could use the silicon saved to do other usefull stuff. - then any process
could use any instruction, and it would be all right. - easy to manage
out of the project - you just have to scan the object code for op codes
that you have decided are dangerous (for whatever stupid reason). 

Another example out of the processor world is the fact that some
modern processors actually force a process to keep in its own 
memory.  What temerity! Who do these idiots think they are
to try to keep "me" from accessing "your" memory - after all, 
I have a good reason - (I'm inquisitive)

This is of course rather more difficult to pick up in a code review,
as I could easily calculate the address, which makes it not
immediately apparent that I will access something not belonging 
to me.  And seeing that Python is not dynamic at all, there is
no analogy here...

> > Surely if "we are all adults here" we have to accept that the
> > other man has as much right to get what he wants, as
> > anybody else, and that his reasons are as valid as those of
> > anybody else.
> 
> Yes., We're all consenting adults.
> 
> But if one adult decides to make rules that the other doesn't agree
> to, is that consenting adults, or is that rape? I apologize for the
> use of the term, but "consenting adults" has particular connotations
> that seem to apply very well here, in the context of that expression.
> 
> Forced encapsulation allows one party to make absolute rules and hold
> absolute authority over another party.
> 

I do not agree with this. If _I_ write a module, and _I_ use forced 
encapsulation for _my_  purposes ( however misguided you might 
think I am) then how does that affect _you_?

Even if I release the thing into the wild - you do not have to use it
if you feel you really *must* muck around with the equivalent
of Steve D'A's example of the length of a builtin - you could write 
your own, or fork what I have done. - It seems that by denying me
the use of such a feature, you are the one trying to make absolute
rules, for *your* benefit - *you* want to use *my* stuff, on *your* 
terms, without having to bother to put any effort into it.

8<----- repeat of "code review cures all" argument ------

> Really. I just don't get the problem. It seems to me that people who
> want this in Python will never be happy *in* Python. Its a very deep
> fundamental feature that Python exposes everything it can, even things
> that are potentially dangerous like sys._getframe. Recently on
> Python-dev(note: I only lurk) someone was working on a debugger and
> they were told in that situation it was OK to access a private member
> of sys to achieve an end: exposing that internal to general use just
> had no value. That's the Python Way. People can dig into things,
> classes, functions, and screw around in wild ways if they want to.
> That *is* what Python is. 95% of code by 95% of people won't ever go
> there, but its there. To remove it means its *not* Python.

Now there are a LOT of dicey statements in the above passionate 
plea - python is a language, and not a philosophy, but I won't go 
into that, as that would lead off onto a tangent, of which there have
been a surfeit in this thread.

But this needs addressing:

Nobody is saying that "Python" should change the way "Python" 
exposes stuff - All that is being requested that *I* should be 
allowed to use python to expose as much of *my* class as *I* 
deem fit, for *my* purposes.

And some form of "private" keyword would do that nicely, 
thank you, and keep the current "public" default unchanged.

Now this is from a user perspective - It may prove to be
difficult, if not impossible, to implement in CPython.  I just
don't know enough details of the implementation to be able 
to tell.

Maybe what is needed is some form of *Interpreter* vs. 
*User* state, analogous to what is done in the hardware,
with defined, "code reviewable, testable for",  procedures 
for switching between one and the other.

- Hendrik




From digitig at gmail.com  Mon Feb  2 06:14:10 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 2 Feb 2009 11:14:10 +0000
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<mailman.8517.1233490750.3487.python-list@python.org>
	<e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <aee48b3c0902020314u32b1bce6l57a1e105c417c9a2@mail.gmail.com>

2009/2/1 MattBD <matthewbdaly at googlemail.com>:

> Really it depends what you are doing. Some languages are very tightly
> integrated with an IDE, such as MS Visual C#, and as far as I can see
> it would be extremely difficult, if not impossible to use a text
> editor with that language.

Why so? I don't see how it would be any different to any other
language. Admittedly I use the IDE because I like IDE's, but I don't
see why it wouldn't work with a text editor and make -- the command
line compiler is there.

-- 
Tim Rowe


From andrew at acooke.org  Mon Feb  2 06:58:10 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 2 Feb 2009 03:58:10 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com>
Message-ID: <be175e80-64a7-4a2c-8a24-02a47aadd6f4@b1g2000yqg.googlegroups.com>

> Just to register a contrary opinion: I *hate* syntax highlighting

you can use it in surprising ways, if the implementation is good
enough.  when i used intellij with java i had the "syntax"
highlighting set so that everything was simple black+white, but
mutable state (i can't remember the exact details; perhaps it was just
variables that were assigned, i am not sure what happened with
attributes) was in bold.  very neat - showed where the likely bugs
were in the code - and nothing to do with what you'd normally consider
syntax highlighting...

andrew

(last time i looked, intellij's support for python was not very good.
which is a pity, because it was an excellent ide - better than
eclipse, imho).


From deets at nospam.web.de  Mon Feb  2 07:01:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 13:01:28 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<mailman.8596.1233574041.3487.python-list@python.org>
Message-ID: <6uo5koFg8q28U1@mid.uni-berlin.de>

> I wonder why the designers of processors do such silly things as having
> user and supervisor modes in the hardware - according to your
> arguments a code review would solve the problem, and then they
> could use the silicon saved to do other usefull stuff. - then any process
> could use any instruction, and it would be all right. - easy to manage
> out of the project - you just have to scan the object code for op codes
> that you have decided are dangerous (for whatever stupid reason).

This is comparing apples to oranges. Forced data encapsulation or not take
place *inside one process*. So this whole argument is a straw-man.

I've seen a lot of programs segfault that are written in C++ with data
encapsulation. And also a lot of them that overcame the restrictions the
compiler or even runtime in java imposed on them, either by pointer-magic,
or through some available backdoors that have been put in place for good
reasons.

So far I haven't seen any argument for forced data encapsulation that went
beyond a matter of personal taste. That's fine, but also just that.

Diez


From cd at okunah.de  Mon Feb  2 07:07:57 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 02 Feb 2009 13:07:57 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
Message-ID: <gm6nla$slr$1@svr7.m-online.net>

Hi,

>> > Just to register a contrary opinion: I *hate* syntax highlighting
>> 
>> With vim you simply don't turn it on. Would that be OK for you?
> 
> No. Even the /possibility/ of having syntax highlighting would indicate
> wimpness and thus humiliate me.

Ah, I guess you are using butterflies then: http://xkcd.com/378/

Christof



From zasaconsulting at gmail.com  Mon Feb  2 07:10:15 2009
From: zasaconsulting at gmail.com (Alessandro Zivelonghi)
Date: Mon, 2 Feb 2009 13:10:15 +0100
Subject: sorting mesh data an from abaqus simulation
Message-ID: <f90d1a1c0902020410p3233185ey8ad425edfcff18d6@mail.gmail.com>

Hello there :) ,

I am a python newbie who needs help with tables(lists?) and other data
structures. My mechanical engineering simulation program (Abaqus) use a
Python env to access model data and results from a simulation. For me a
model means a "mesh" of that model, i.e. a lists of nodes and elements which
discretized the CAD model.
In Abaqus each mesh has the following structure (see "
http://www.tecnopolis.eu/upload/mesh.inp"):

- a list of NODES in form of a table ( nodelabel_n, coordinatex,
coordinatey)

- and a list of ELEMENTS also in form of a table. Each element refers to
three nodes (which must be in the list of nodes) and the table looks like
this

 (elementlabel_n, node_n1, node_n2, node_n3)

Through following py script I can access all nodes (--> *N*) and elements
(--> *EL*) from the "mesh-1.odb" file (
http://www.tecnopolis.eu/upload/mesh-1.odb) where the simulation results are
stored.

*from odbAccess import *
from odbSection import *

nameodb = 'mesh-1'


path = '/onepath/' + nameodb + '.odb'
odb = openOdb(path)

**N = odb.rootAssembly.instances['PART-1-1'].nodes
*
*EL = odb.rootAssembly.instances['PART-1-1'].elements
*
Info:
to get a node label, for example the label of the node object n5 in the list
Ntop:  *Ntop[5].label*
to get the x coordinates of that node: *Ntop[5].coordinates[0]*

In particular I am interested in the node subset "TOP" (which represents all
the nodes at the top of my model)

*Ntop = odb.rootAssembly.instances['PART-1-1'].nodeSets['TOP'].nodes
*
Problem:
1) the list of nodes Ntop contains all the node labels [2673,   2675,
2676,   2677,   2678,   3655,   3656, 119939, 124154, 127919] already
ordered in ascending order.
What I need is the same list *ordered by coordinate_x* of each node, i.e.
from left to right in the model (unfortunately, for example node 124154
cames before node 3656 in the model, if you read the model from left to
right)


1b) I don't understand which kind of data are EL, N, Ntop (list?) and how
can I sort Ntop  with the criterium based on coordinate_x (coordinate[0])

Many thanks, Alex

-- 







> Alessandro Zivelonghi
>
> http://www.tecnopolis.eu
>
> skype: alexzive
>
> "Energy and persistence conquer all things."
> Benjamin Franklin (1706 - 1790)
>
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From feliphil at gmx.net  Mon Feb  2 07:15:55 2009
From: feliphil at gmx.net (Wolfgang Keller)
Date: Mon, 2 Feb 2009 13:15:55 +0100
Subject: Python package Management GUI - New Project on Sourceforge
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>
	<mailman.8569.1233552249.3487.python-list@python.org>
Message-ID: <20090202131555.3d4ff2a4.feliphil@gmx.net>

> David, I would really recommend that you
> seriously consider using the Tcp/Tk toolkit.

I would seriously disrecommend using Tcl/Tk.

> Why ?

Because it doesn't allow to build a GUI application with not-ridiculous
functionality, "look-and-feel" and quirk-free behaviour.

> Because of my point above, you'll find the tool will most likely have
> a greater impact and uptake than one requiring a user or developer to
> install a 3rd party toolkit and library just to use your gui package
> manager :)

I'm using applications that use wxPython, PyGTK, PyQt etc. every day
that don't require to "install" anything, not even _themselves_. In fact
this (zero-install applications) is the _only_ actually "simple" way to
distribute applications. And it is the standard way to distribute
applications for the Mac.


From rdmurray at bitdance.com  Mon Feb  2 07:40:08 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 12:40:08 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
Message-ID: <gm6pj8$se0$1@ger.gmane.org>

Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> <rd.....murray at bitdance.com> wrote:
> 
> > 
> > You, sir, should be programming in some language other than Python.
> 
> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a 
> whole system without hiding a single item.
> Conversely, the lack of data hiding is perceived as a weakness,
> and IMO harms the advocacy of the language - This is proven
> by your statement above, whereby you are driving a user away,
> simply because the language, in one small aspect, does not
> give him what he wants, and the tenor of this thread has been
> very much: "That's how it is - like it or lump it", and no amount
> of careful explanation of why people want the feature has cut 
> any ice - It has all the time been countered with statements
> about how the proponents of private attributes "don't need it",
> (as if they are plain dumb), that an underscore convention is 
> "just as good", (It isn't), that you could crack it if you really 
> tried, (so what?), and other more specious reasons.
> 
> This is IMO an arrogant attitude - 

My apologies!!  There was a smiley missing from the end of that statement
above.  However, you are right, even with the smiley added it would
still be arrogant, and I regret that.

The problem is that there is a fundamental philosophical divide here,
and I don't think the advocates on either side are going to convince
the other.

This debate has happened many times.  

--RDM




From python at bdurham.com  Mon Feb  2 07:51:10 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 02 Feb 2009 07:51:10 -0500
Subject: Import without executing module
In-Reply-To: <7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
Message-ID: <1233579070.32519.1298029177@webmail.messagingengine.com>

If the output is coming from a print command, couldn't the OP
temporarily redirect STDIO to a file to prevent the output from being
displayed?

Malcolm


----- Original message -----
From: "Stephen Hansen" <apt.shansen at gmail.com>
To: "Ray" <raykyoto at gmail.com>
Cc: python-list at python.org
Date: Sun, 1 Feb 2009 23:19:09 -0800
Subject: Re: Import without executing module

On Sun, Feb 1, 2009 at 11:05 PM, Ray <raykyoto at gmail.com> wrote:
> Basically, someone has created a python script and I would like to
> make use of his functions.  I would prefer to not modify his file so
> what I would like to do is just write my script and import parts that
> are needed.  i.e., I would like to separate my changes from his as
> best as I can.  However, that other module has both functions (def's,
> which I would like to use) and top-level commands which I don't need
> and in fact, prints errors when I import it since it was meant to be
> run as a top-level module and not imported in.  i.e., its expecting
> arguments to be supplied.

Unfortunately, that's not possible, I believe. All the top level
commands in a particular Python script are executed: that's how the
functions get created.

--S
--
http://mail.python.org/mailman/listinfo/python-list


From rdmurray at bitdance.com  Mon Feb  2 07:59:56 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 12:59:56 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
Message-ID: <gm6qoc$v0g$1@ger.gmane.org>

Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> Now there are a LOT of dicey statements in the above passionate 
> plea - python is a language, and not a philosophy, but I won't go 
> into that, as that would lead off onto a tangent, of which there have
> been a surfeit in this thread.

Ah, now I understand.  This is where you part company from the
people you are arguing against.

Python _is_ a philosophy.

There is no smiley after that statement.  :)

--RDM

PS: More accurately, Python _embodies_ a philosophy, and to advocate
changes that go against that philosophy is to advocate changing
Python into something that would no longer be Python.  You can do
that, but you aren't likely to get the community to follow you.



From rdmurray at bitdance.com  Mon Feb  2 08:14:52 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 13:14:52 +0000 (UTC)
Subject: Membership of multiple items to a list
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm6rkb$3bk$1@ger.gmane.org>

My client can handle your Mime and shows me the text part of the signed
message.  It's not as pretty as just seeing an unsigned text message,
but that's a client problem, not yours :)

I would like to think that all newsreader clients could handle mime at
this point, but who knows.

--RDM



From mal at egenix.com  Mon Feb  2 08:21:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 02 Feb 2009 14:21:31 +0100
Subject: install modules for specific python version
In-Reply-To: <4984F415.6090902@catphive.net>
References: <4984F415.6090902@catphive.net>
Message-ID: <4986F35B.2080003@egenix.com>

On 2009-02-01 02:00, Brendan Miller wrote:
> I have several version of python running side by side on my ubuntu
> install (2.5,2.6,3.0).
> 
> I'm installing a module with a setup.py script, in this case
> logilab-common, so that I can get pylint going. However, I need to
> install into python 2.6, but by default it picks out 2.5 and throws
> things in the site packages for that version.
> 
> Is there a standard way to specify what version of python you want to
> install into? I originally installed my other python versions with the
> altinstall method.

That's easy: just call the setup.py script with the version you want
the modules installed to, e.g.

python2.5 setup.py install
python2.6 setup.py install
etc.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 02 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mail at microcorp.co.za  Mon Feb  2 08:45:48 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 15:45:48 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com><cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com><4981985B.4070108@wildenhain.de><783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<gm6pj8$se0$1@ger.gmane.org>
Message-ID: <005101c98549$d33a7420$0d00a8c0@hendrik>

<rd....murray at bi..nce.com> wrote:

> Quoth "Hendrik van Rooyen" <mail at microcorp.co.za>:
> > <rd.....murray at bitdance.com> wrote:
> > 
> > > 
> > > You, sir, should be programming in some language other than Python.

8<------------- reasons given ----------------

> > This is IMO an arrogant attitude - 
> 
> My apologies!!  There was a smiley missing from the end of that statement
> above.  However, you are right, even with the smiley added it would
> still be arrogant, and I regret that.

It was not actually aimed at you personally - more of a rant about
the intolerance displayed by the "it's fine as it is" group.

> 
> The problem is that there is a fundamental philosophical divide here,
> and I don't think the advocates on either side are going to convince
> the other.

It certaintly looks like that - so far it has produced more heat than
light, and very few funny comments

> 
> This debate has happened many times.  
> 

So why are we dumb enough to repeat it?

:-)

- Hendrik




From mail at microcorp.co.za  Mon Feb  2 08:54:08 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 15:54:08 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
Message-ID: <005201c98549$d3eb74a0$0d00a8c0@hendrik>

<r...ray at bi...nce.com> wrote:


> Quoth "Hendrik van Rooyen" <m.. at mi...orp.co.za>:
> > Now there are a LOT of dicey statements in the above passionate
> > plea - python is a language, and not a philosophy, but I won't go
> > into that, as that would lead off onto a tangent, of which there have
> > been a surfeit in this thread.
>
> Ah, now I understand.  This is where you part company from the
> people you are arguing against.
>
> Python _is_ a philosophy.
>
> There is no smiley after that statement.  :)
>
> --RDM
>
> PS: More accurately, Python _embodies_ a philosophy, and to advocate
> changes that go against that philosophy is to advocate changing
> Python into something that would no longer be Python.  You can do
> that, but you aren't likely to get the community to follow you.

*sits on his hands to try to avoid the tangent, with the gaping hole of religion
looming beneath the spiderweb of philosophy, and the language spec gathering
dust in the corner, forgotten and forlorn*

:-)

- Hendrik




From RLComstock3 at gmail.com  Mon Feb  2 09:06:02 2009
From: RLComstock3 at gmail.com (Robert Comstock)
Date: Mon, 2 Feb 2009 06:06:02 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net> 
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
	<gm6nla$slr$1@svr7.m-online.net>
Message-ID: <703974cb-5ef4-4ec9-9bb5-02fda4f70251@w39g2000prb.googlegroups.com>

I am personally a fan of vim and ipython.  But most of my development
is done on a remote system with ssh access.  I have used many IDE's
over the years and personally I feel like they try to hard to do
everything for you that they end up doing very little the way I would
like.  There are MANY text editors out there and all you need to do is
find the one that fits your development style.  There are not so many
IDE's and I found they wanted me to fit their styles.

Why I like Vim:

1. Light and fast
2. Goes over ssh very well
3. Simple configuration
4. Lots of flexibility
5. Can your text editor do this?
Vim search and replace, with increment
:let i=1 | g/foo/s//\=i."morestuff"/ | let i=i+1
http://gdwarner.blogspot.com
6. Fast editing (once you have paid the price to learn it)

I think the reality is productity, I would not be productive trying to
write code on my computer then moving it to a server, it would be
difficult to duplicate the enviroment without leaving my PC a garbage
dump of packages I don't need.  But that is not the case for many
people.  I also like Kate, it has server me well in my quest to learn
vim.

Thanks,

Robert Comstock


Lenovo T61 2.2Ghz/3GB Ram, Arch Linux x86_64, KDE 4.2




On Feb 2, 5:07?am, Christof Donat <c... at okunah.de> wrote:
> Hi,
>
> >> > Just to register a contrary opinion: I *hate* syntax highlighting
>
> >> With vim you simply don't turn it on. Would that be OK for you?
>
> > No. Even the /possibility/ of having syntax highlighting would indicate
> > wimpness and thus humiliate me.
>
> Ah, I guess you are using butterflies then:http://xkcd.com/378/
>
> Christof



From kdawg44 at gmail.com  Mon Feb  2 09:14:26 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 09:14:26 -0500
Subject: Refreshing an IE Webpage
Message-ID: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>

Hi,

I am trying to get and then refresh a page in IE with a Python script.  I
just want to get a page, then refresh it every 5 minutes.  Below is the code
I am attempting.  It is erroring out on the
id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
#tried with and without parens - reload & reload()
line.  This is mostly a borrowed script I found.  The script was trying to
call a written function on the page.  I just want to call the build in
reload function to refresh the page.

Thanks for any help.

Kevin


import win32com.client, pythoncom
from time import sleep

ie=win32com.client.Dispatch('internetexplorer.application')
ie.Visible=1
ie.Navigate('URL')
sleep(5)

id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
while True:
    res=ie.Document.Script._oleobj_.Invoke(id, 0, pythoncom.DISPATCH_METHOD,
True)
    sleep(300)
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From aahz at pythoncraft.com  Mon Feb  2 09:30:00 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 06:30:00 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
Message-ID: <gm7018$j39$1@panix3.panix.com>

In article <874ozd3cr3.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>aahz at pythoncraft.com (Aahz) writes:
>>
>> Just to register a contrary opinion: I *hate* syntax highlighting
>
>On what basis?

It makes my eyes bleed
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From grflanagan at gmail.com  Mon Feb  2 09:37:36 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Mon, 02 Feb 2009 14:37:36 +0000
Subject: ElementTree and clone element toot
In-Reply-To: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
Message-ID: <gm70fg$l49$1@ger.gmane.org>

m.banaouas wrote:
> Hi all,
> Working with the ElementTree module, I looked for clone element function but not
> found such tool:
> 
> def CloneElment(fromElem, destRoot = None)
> fromElem is the element to clone
> destRoot is the parent element of the new element ; if None so the new element
> will be child of fromElem parent. The clone operation is recursive to make it
> process all subtree of the element to clone.
> 
> here is my first implementation:
> 
> def CloneElement(fromElem, destRoot = None):
>   if destRoot == None:
>     fromRoot = ET.ElementTree(fromElem).getroot()
>     destRoot = fromRoot
>   destElem = destRoot.makeelement(fromElem.tag, fromElem.attrib)
>   destRoot.append(destElem)
>   destElem.text = fromElem.text
>   for e in fromElem.findall('*'):
>     CloneElement(e, destElem)
> #
> this function works fine only if destRoot parameter is defined by the caller
> context. The problem is about retreiving parent element: I didn't found any way
> to determine the parent element of an element "elem" by asking elem itself!
> and ET.ElementTree(fromElem).getroot() is wrong because it returns fromElem
> itself, not its parent.
> 
> Thanks for any help.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 


Maybe `dest = ET.fromstring(ET.tostring(src))` would do?

Or as follows:

from xml.etree import ElementTree as ET

s = '''
<root>
    <a name="A">text
    <b name="B"><bb name="BB">BBtext
    </bb></b>
    </a>
    <c />
    <d name="D" />
    <e>EEText</e>
</root>
'''

e = ET.fromstring(s)

def clone(elem):
     ret = elem.makeelement(elem.tag, elem.attrib)
     ret.text = elem.text
     for child in elem:
         ret.append(clone(child))
     return ret

f = clone(e)

assert ''.join(ET.tostring(e).split()) == ''.join(ET.tostring(f).split())

assert f[0].get('name') == e[0].get('name')

f[0].set('name', 'NEWNAME')

assert f[0].get('name') == 'NEWNAME'
assert f[0].get('name') != e[0].get('name')



From gagsl-py2 at yahoo.com.ar  Mon Feb  2 09:59:44 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 12:59:44 -0200
Subject: Config files editor
References: <gm4lgh$fdv$1@ger.gmane.org>
Message-ID: <op.uoqbxufbx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 15:17:34 -0200, Tim Michelsen  
<timmichelsen at gmx-topmail.de> escribi?:

> Hello Python,
> does anyone know of a Python based project that has a GUI based  
> functionality to edit
> config files read/written by ConfigParser?

I think that people likes the ConfigParser format in part because it can  
be edited using *any* kind of editor.
If you provide useful comments for all settings, most users should be able  
to modify it by themselves -- at least *my* type of users, perhaps your  
environment is different.

-- 
Gabriel Genellina



From alejandro.weinstein at gmail.com  Mon Feb  2 10:00:43 2009
From: alejandro.weinstein at gmail.com (Alejandro)
Date: Mon, 2 Feb 2009 07:00:43 -0800 (PST)
Subject: Get thread pid
References: <1f4ff371-447d-4eca-8c51-e73eb10ed8c5@a12g2000pro.googlegroups.com>
	<mailman.8396.1233348060.3487.python-list@python.org>
	<31508b6d-bebb-45e6-b57c-525d370e22c0@r37g2000prr.googlegroups.com>
	<9g8wopuphz.fsf@overberg.jeppesensystems.com>
Message-ID: <5a2414d1-128e-4a02-bb81-d981429bf8b8@p2g2000prf.googlegroups.com>

On Feb 2, 3:01?am, Ove Svensson <ove.svens... at jeppesen.com> wrote:
> If you find a way to get to the real TID, that will be specific to
> your architecture.
>
> If htop (or any other application) returns a TID, that is either
> artificial or architecture specific.

Right know I only need the TID for debugging under Linux. I will keep
this information in mind though.

Alejandro.


From sjmachin at lexicon.net  Mon Feb  2 10:14:48 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 07:14:48 -0800 (PST)
Subject: Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au> 
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
Message-ID: <65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>

On Feb 2, 10:07?pm, Gilles Ganault <nos... at nospam.com> wrote:
> On Mon, 02 Feb 2009 20:06:02 +1100, Ben Finney
>
> <bignose+hates-s... at benfinney.id.au> wrote:
> >The Python data types for date and time are in the ?datetime? module
> ><URL:http://www.python.org/doc/2.6/library/datetime>. Create a
> >?datetime? object for each value you want, then compare them.
>
> Thanks guys. For those interested, here's how to perform the
> conversion from DD/MM/YYYY to YYYY-MM-DD:
>
> =====
> import datetime
>
> connection = datetime.datetime.strptime("21/02/2008",
> "%d/%m/%Y").strftime("%Y-%m-%d")
> print connection



Gilles, that's certainly one way of doing it in Python.

Here's another:

>>> '-'.join(reversed('21/02/2008'.split('/')))
'2008-02-21'

Please consider the following:
If in fact the database has a text-type column (VARCHAR or similar)
that contains dates formatted as DD/MM/YYYY:

(1) somebody should be talking rather bluntly to the database
designer, and that column should be fixed if possible without breaking
other code

(2) doing the comparison on the client side (i.e. in Python) instead
of on the server side (i.e. in SQL) means that there will be
unnecessary data transmitted to the client side -- hence this should
only be considered if the volume of data is small. Imagine trying to
do a relational join using that column and another (normal) date
column by sucking both tables down to the client!

(3) it's quite possible to do the comparison in SQL:

e.g. if the column is named "d":

WHERE SUBSTR(d, 7, 4) || SUBSTR(d, 4, 2) || SUBSTR(d, 1, 2) <
'20090201' -- insert '-' if preferred
or something similar should be doable in any SQL implementation. Most
will have functions like str[pf]time that could be used to similar
effect.

Cheers,
John


From gagsl-py2 at yahoo.com.ar  Mon Feb  2 10:18:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 13:18:08 -0200
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gm70fg$l49$1@ger.gmane.org>
Message-ID: <op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan <grflanagan at gmail.com>  
escribi?:

> e = ET.fromstring(s)
>
> def clone(elem):
>      ret = elem.makeelement(elem.tag, elem.attrib)
>      ret.text = elem.text
>      for child in elem:
>          ret.append(clone(child))
>      return ret
>
> f = clone(e)

You forget the tail attribute, and you also should use the SubElement  
factory instead of makeelement as documented; doing that fixes the  
"parent" issue too.

-- 
Gabriel Genellina



From drkjam at gmail.com  Mon Feb  2 10:18:39 2009
From: drkjam at gmail.com (David Moss)
Date: Mon, 2 Feb 2009 07:18:39 -0800 (PST)
Subject: the 'right way' to distribute and access data files in a packaged 
	Python module
Message-ID: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>

Hi,

I'm the author of netaddr :-

    http://pypi.python.org/pypi/netaddr/0.6

For release 0.6 I've added setuptools support so it can be distributed
as a Python egg package using the easy_install tool.

In 0.6, I've started bundling some data files from IEEE and IANA with
the code below the site-packages install path (lib/site-packages/
netaddr/...). netaddr accesses and parses these files on module load
to provide various IP and MAC address related information via its API.

This mechanism works for the setuptools based packages because on
install they extract to the filesystem and can be accessed using
something like :-

    >>> index = open(os.path.join(__file__, 'oui.idx'))

However, setuptools seems to perform some magic for module imports
which prevents me from accessing these files directly as they are
bundled inside an egg (zip) file :-(

Two questions arise out of this situation :-

1) is there a better way to distribute the files, i.e. should I be
using a different more correct path instead of site-packages for data?
If so, where is this and how do I add it to my setup scripts and code?

2) is there an easy (and portable) way for me to dive inside an egg
file to access the data I required (ugly but workable). I'm assuming
I'd need to check for the presence of setuptools available with the
Python interpreter etc.

My users and I would be grateful for and help and advice.

Many thanks,

Dave M.


From mail at microcorp.co.za  Mon Feb  2 10:20:01 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 2 Feb 2009 17:20:01 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org>
	<6uo5koFg8q28U1@mid.uni-berlin.de>
Message-ID: <005301c98549$d4934d60$0d00a8c0@hendrik>


Hendrik:
> > I wonder why the designers of processors do such silly things as having
> > user and supervisor modes in the hardware - according to your
> > arguments a code review would solve the problem, and then they
> > could use the silicon saved to do other usefull stuff. - then any process
> > could use any instruction, and it would be all right. - easy to manage
> > out of the project - you just have to scan the object code for op codes
> > that you have decided are dangerous (for whatever stupid reason).
> 
Diez:
> This is comparing apples to oranges. Forced data encapsulation or not take
> place *inside one process*. So this whole argument is a straw-man.

I do not agree with this, but then I won't will I? 

The reason is that I see a level of abstraction that makes it kind of
irrelevant whether something is run as a process, a thread, a time
multiplexed mainloop, on one or more processors, wherever or 
whatever - almost like a fractal structure spread across the total 
addressable space - and I would like to use the same rules 
everywhere.  And if there are reasons for forced encapsulation
*somewhere*, then it is more elegant (to my taste) to allow it 
*everywhere*.  - and conversely, of course.  Hence the rather 
*an der Haare herbeigezogen* (see ** below) argument 
based on the forced restrictions in processors.

I see almost any piece of code that "does something" as a black
box that has inputs and outputs - and I like to string them together
in a style that resembles a systolic array - closer to unix piping ,
based on true queueing and message passing, where it becomes 
at all practical.

Given this approach, there is no reason whatever for anything
to mess with any other thing's innards - in fact the less you know 
about it, the more robust and predictable the system becomes.

And in embedded processes, there exist things that are time
critical, that are designed to be used in one way, and no other,
and that can have serious consequences if messed with- when
I have started moving the 100 tonne mass, then I *cannot* tolerate
other code changing my timeouts or speeds or feeds in an arbitrary
fashion - EXPENSIVE noises will result.

> I've seen a lot of programs segfault that are written in C++ with data
> encapsulation. And also a lot of them that overcame the restrictions the
> compiler or even runtime in java imposed on them, either by pointer-magic,
> or through some available backdoors that have been put in place for good
> reasons.

I think that segfaulting is basically caused by programming error - 
By the inability of the programmer actually to understand the 
limitations of the compiler to "do what I mean".

Encapsulation or data hiding will never "cure" that, because
at best it could move some of the errors from runtime to 
compile time.

I doubt the "good reasons for backdoors" part - I think that comes 
from a design that has either not been done, or used, at the correct 
level of granularity.

> So far I haven't seen any argument for forced data encapsulation that went
> beyond a matter of personal taste. That's fine, but also just that.

This could be true, and if it is, we are just beating our heads one against
the other, trying to win non existent prizes for pig-headedness.

I could also turn that argument around, as well as stating it stronger:

So far I have not seen any argument in favour of free access to
the internals of another piece of code that is based on ANY necessity,
(beside a handwaving "good reasons" ) or that goes beyond a matter
of personal taste based on a hacker's glee in meddling in somebody
else's code.

:-)

- Hendrik

** -*an der Haare herbeigezogen* German, literally "drawn closer by the hair"
expression denoting either a specious argument or a forced analogy.  Sorry,
but I could think of no English equivalent.






From kyosohma at gmail.com  Mon Feb  2 10:30:54 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 07:30:54 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
References: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>
Message-ID: <0e7db74f-091a-4948-a330-bd57599deecf@v5g2000pre.googlegroups.com>

On Feb 2, 3:05?am, pranav <pra... at gmail.com> wrote:
> Hi Folks,
>
> I am designing a project for Windows XP/Vista, one part of which is a
> background process that monitors internet connections. If the user
> tries to connect to any particular site, say myDummySite.com in then
> some actions are taken, based on fixed policies.
> This can be thought of a mini firewall.
>
> I am sure there must be some good libraries for this purpose. I need
> the names of those libraries.
>
> Thanks,
>
> Pranav Prakash

You could try urllib2, socket or just call ping with subprocess.

Mike


From goon12 at gmail.com  Mon Feb  2 10:36:52 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Mon, 2 Feb 2009 10:36:52 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <gm7018$j39$1@panix3.panix.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>

I typically use vim/vi, because it's usually already installed on the
OS's I work with and vim for Windows works the same. Also, using the
same editor across these different OS's, I don't have to worry too
much soft/hard tabs. The contents of rc files on both Windows and
UNIX/Linux are the same too, so I can just maintain one run control
file for all OS's.

I have played around with some IDE's for python, and found that Komodo
Edit is pretty good. It's also free:
http://www.activestate.com/komodo_edit/


From gagsl-py2 at yahoo.com.ar  Mon Feb  2 10:39:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 13:39:50 -0200
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
Message-ID: <op.uoqdsoerx6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 06:59:16 -0200, Ron Garret <rNOSPAMon at flownet.com>  
escribi?:

> I'm running the following WSGI app under Yaro:
>
> def error(req):
>   try:
>     req.non_existent_key
>   except:
>     try:
>       return cgitb.html(sys.exc_info())
>     except:
>       return 'foo'
>
> The result of running this is 'foo'.  In other words, the reference to
> the non-existent key generates an exception as expected, but then the
> generation of the traceback generates ANOTHER exception, which I would
> not have expected.  If I add another TRY/EXCEPT block to capture this
> exception, the result is attached at the bottom of this message.

Unqualified excepts are evil -- see this recent post (mine)
http://groups.google.com/group/comp.lang.python/msg/05e822f694b6421c

But in this case you hit a known bug in cgitb - see  
http://bugs.python.org/issue4643 for a solution.

-- 
Gabriel Genellina



From grflanagan at gmail.com  Mon Feb  2 10:52:59 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Mon, 02 Feb 2009 15:52:59 +0000
Subject: ElementTree and clone element toot
In-Reply-To: <op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>	<gm70fg$l49$1@ger.gmane.org>
	<op.uoqcsiv5x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gm74sv$69g$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan 
> <grflanagan at gmail.com> escribi?:
> 
>> e = ET.fromstring(s)
>>
>> def clone(elem):
>>      ret = elem.makeelement(elem.tag, elem.attrib)
>>      ret.text = elem.text
>>      for child in elem:
>>          ret.append(clone(child))
>>      return ret
>>
>> f = clone(e)
> 
> You forget the tail attribute, 

I did, thanks.

and you also should use the SubElement
> factory instead of makeelement as documented; doing that fixes the 
> "parent" issue too.
> 

I suppose I would have just used the Element factory if the OP hadn't 
otherwise:

def clone(elem):
     ret = ET.Element(elem.tag, elem.attrib)
     ret.text = elem.text
     ret.tail = elem.tail
     for child in elem:
         ret.append(clone(child))
     return ret

Not sure what SubElement gains you, in the context of the above function?



From ppearson at nowhere.invalid  Mon Feb  2 10:58:43 2009
From: ppearson at nowhere.invalid (Peter Pearson)
Date: 2 Feb 2009 15:58:43 GMT
Subject: Membership of multiple items to a list
References: <mailman.8581.1233563066.3487.python-list@python.org>
Message-ID: <6uojhjFgavaqU1@mid.individual.net>

Sorry to whine, but here's how this looks on slrn:

On Mon, 2 Feb 2009 00:24:19 -0800 (PST), Stephen Hansen wrote:
> This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
> -------firegpg072eqfqovlg25y5x7pu7mz3
> Content-Type: text/plain; format=flowed; charset=UTF-8
> Content-Transfer-Encoding: base64
>
> T24gU3VuLCBGZWIgMSwgMjAwOSBhdCA3OjQ3IFBNLCBCZW4gRmlubmV5IDxiaWdub3NlK2hhdGVz
[many similarly informative lines omitted]
> cnJ5IGZvciB0aGUgaW5jb252ZW5pZW5jZS4gDQoNCi0tU3RlcGhlbg==
> -------firegpg072eqfqovlg25y5x7pu7mz3
> Content-Type: application/pgp-signature; name="signature.asc"
> Content-Description: OpenPGP digital signature
> Content-Disposition: attachment; filename="signature.asc"
>
>
> -------firegpg072eqfqovlg25y5x7pu7mz3--


-- 
To email me, substitute nowhere->spamcop, invalid->net.


From rNOSPAMon at flownet.com  Mon Feb  2 11:10:19 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Mon, 02 Feb 2009 08:10:19 -0800
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
	<mailman.8612.1233589195.3487.python-list@python.org>
Message-ID: <rNOSPAMon-ED547A.08101902022009@news.gha.chartermi.net>

In article <mailman.8612.1233589195.3487.python-list at python.org>,
 "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:

> En Mon, 02 Feb 2009 06:59:16 -0200, Ron Garret <rNOSPAMon at flownet.com>  
> escribi?:
> 
> > I'm running the following WSGI app under Yaro:
> >
> > def error(req):
> >   try:
> >     req.non_existent_key
> >   except:
> >     try:
> >       return cgitb.html(sys.exc_info())
> >     except:
> >       return 'foo'
> >
> > The result of running this is 'foo'.  In other words, the reference to
> > the non-existent key generates an exception as expected, but then the
> > generation of the traceback generates ANOTHER exception, which I would
> > not have expected.  If I add another TRY/EXCEPT block to capture this
> > exception, the result is attached at the bottom of this message.
> 
> Unqualified excepts are evil -- see this recent post (mine)
> http://groups.google.com/group/comp.lang.python/msg/05e822f694b6421c
> 
> But in this case you hit a known bug in cgitb - see  
> http://bugs.python.org/issue4643 for a solution.

Aha!  Thank you!  That explains everything, except this:  why does the 
problem go away when I run under wsgiref and capture the request in a 
global variable?

Feel free to treat that as a rhetorical question :)

rg


From sjmachin at lexicon.net  Mon Feb  2 11:11:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 08:11:40 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
Message-ID: <14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>

On Feb 2, 11:51?pm, pyt... at bdurham.com wrote:
> If the output is coming from a print command, couldn't the OP
> temporarily redirect STDIO to a file to prevent the output from being
> displayed?

He could, but that'd be a kludge on top of a stuff-up. He should put
the script-only statements inside
    if __name__ == '__main__':
and send the result back to the original author, who may in fact
appreciate being enlightened :-)

Cheers,
John


From james at agentultra.com  Mon Feb  2 11:17:06 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:17:06 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <873aew24ql.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From banaouas.medialog at wanadoo.fr  Mon Feb  2 11:21:29 2009
From: banaouas.medialog at wanadoo.fr (m.banaouas)
Date: Mon, 02 Feb 2009 17:21:29 +0100
Subject: ElementTree and clone element toot
In-Reply-To: <mailman.8607.1233587896.3487.python-list@python.org>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>	<gm70fg$l49$1@ger.gmane.org>
	<mailman.8607.1233587896.3487.python-list@python.org>
Message-ID: <49871c5b$0$4087$ba4acef3@news.orange.fr>

My python version is 2.4.4

def SubElement(parent, tag, attrib={}, **extra):

Can you tell me how does "parent" issue could be solved by SubElement ?
I'm looking for how to determine element parent just by asking element it self.
It seems like element doesn't know witch is its parent, while any parent knows
well witch are its childs.

My goal is to clone an element and attach it to a specified parent or to parant
of original element to clone.

may be better implementation of CloneElement is to let the caller context make
the attachement between the clone and its parent.

Gabriel Genellina a ?crit :
> En Mon, 02 Feb 2009 12:37:36 -0200, Gerard Flanagan
> <grflanagan at gmail.com> escribi?:
> 
>> e = ET.fromstring(s)
>>
>> def clone(elem):
>>      ret = elem.makeelement(elem.tag, elem.attrib)
>>      ret.text = elem.text
>>      for child in elem:
>>          ret.append(clone(child))
>>      return ret
>>
>> f = clone(e)
> 
> You forget the tail attribute, and you also should use the SubElement
> factory instead of makeelement as documented; doing that fixes the
> "parent" issue too.
> 


From james at agentultra.com  Mon Feb  2 11:30:54 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:30:54 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <871vug243l.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From james at agentultra.com  Mon Feb  2 11:33:02 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:33:02 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <87wsc8ztmp.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From james at agentultra.com  Mon Feb  2 11:38:34 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 16:38:34 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
Message-ID: <87vdrsztdh.fsf@agentultra.com>

Chris Rebert <clp2 at rebertia.com> writes:

> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> bool(-1)
> True
>
> str.find() returns -1 on failure (i.e. if the substring is not in the
> given string).
> -1 is considered boolean true by Python.

That's an odd little quirk... never noticed that before.

I just use regular expressions myself.

Wouldn't this be something worth cleaning up? It's a little confusing
for failure to evaluate to boolean true even if the relationship isn't
direct.


From gnewsg at gmail.com  Mon Feb  2 12:01:10 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Mon, 2 Feb 2009 09:01:10 -0800 (PST)
Subject: Monitor Internet connections in XP/Vista
References: <a92ee246-88bd-415b-aa8f-4d8d9185306b@p2g2000prf.googlegroups.com>
Message-ID: <c20afb68-6578-4996-9b0e-2af54e6f5849@i20g2000prf.googlegroups.com>

On 2 Feb, 10:05, pranav <pra... at gmail.com> wrote:
> Hi Folks,
>
> I am designing a project for Windows XP/Vista, one part of which is a
> background process that monitors internet connections. If the user
> tries to connect to any particular site, say myDummySite.com in then
> some actions are taken, based on fixed policies.
> This can be thought of a mini firewall.
>
> I am sure there must be some good libraries for this purpose. I need
> the names of those libraries.
>
> Thanks,
>
> Pranav Prakash

I doubt there's something so low-level and platform specific for
Python.
You could eventually observe what happens on the wire by using libpcap/
Winpcap ("pcapy" and "pypcap" are some python bindings I heard of) but
forget about applying policies like "allow/deny this or that traffic"
natively.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From thmpsn.m.k at gmail.com  Mon Feb  2 12:02:13 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Mon, 2 Feb 2009 09:02:13 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
Message-ID: <67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>

On Feb 2, 2:55?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > This is proven
> > by your statement above, whereby you are driving a user away,
> > simply because the language, in one small aspect, does not
> > give him what he wants, and the tenor of this thread has been
> > very much: "That's how it is - like it or lump it", and no amount
> > of careful explanation of why people want the feature has cut
> > any ice -
>
> I'm missing the careful explanation. What I've heard is that the lack
> of enforced encapsulation is "a danger". What I've heard is that
> people want it because they've been told they should want it and
> believe that. Why?

Who has said the latter? Are you just trying to spread FUD?

> There have been no "careful explanations" to answer that, in my mind.
> And thus my response is: the practical possibility of needing access
> vastly outweights the theoretical situation that might go bad if
> encapsulation wasn't there. Why? Because in any real situation, IMHO,
> *forced* encapsulation is pointless.

I think you've gotten too subjective on this matter. You might as well
say that we don't need no stinkin' OOP, we could all just be
programming with goto's.

Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
PLAIN FUNCTIONS (!!!!) !!!!

Heck, why do we even need OOP?? Long live procedural!!

We don't even need no stinkin programming languages, we could just
program using 1's and 0's!!!!!!!!!

What's with this luddite attitude, Python community?

> > It has all the time been countered with statements
> > about how the proponents of private attributes "don't need it",
> > (as if they are plain dumb),
>
> They don't need it. No one has shown a *real* reason why. The only
> reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> That's not a real reason. If its your project that someone is doing
> bad in, this is a situation which can be *clearly* specified in a
> projects policy and coding standards and can be *trivially* tested for
> with simple static analysis in nearly all cases. The problem is the
> person and not the code then. There's *countless* other ways that
> person can do bad if you're allowing them to commit blindly anything
> into your project.

Aha! I see this attitude quite often among C/C++ people, regarding
buffer overflows and uninitialized pointer dereferences: someone will
say "C and C++ are unsafe languages because they allow you to overrun
buffers", then a C/C++ zealot will respond "Hire some good
programmers".

SAME ATTITUDE.



From __peter__ at web.de  Mon Feb  2 12:05:09 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 02 Feb 2009 18:05:09 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<87wsc8ztmp.fsf@agentultra.com>
Message-ID: <gm7942$5gv$03$1@news.t-online.com>

J Kenneth King wrote:

> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
>> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> bool(-1)
>> True
>>
>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
> 
> That's an odd little quirk... never noticed that before.
> 
> I just use regular expressions myself.
> 
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.

Well, what is your suggested return value when the substring starts at
position 0?

>>> "abcde".find("abc")
0

By the way, there already is a method with a cleaner (I think) interface:

>>> "abcde".index("abc")
0
>>> "abcde".index("cde")
2
>>> "abcde".index("xyz")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: substring not found

Peter



From thorsten at thorstenkampe.de  Mon Feb  2 12:05:38 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 18:05:38 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <gm6h0e$j07$2@svr7.m-online.net>
	<MPG.23f0eb2cf71f9dc39897b7@news.individual.de>
	<gm6nla$slr$1@svr7.m-online.net>
	<703974cb-5ef4-4ec9-9bb5-02fda4f70251@w39g2000prb.googlegroups.com>
Message-ID: <MPG.23f14648b829536f9897b8@news.individual.de>

* Robert Comstock (Mon, 2 Feb 2009 06:06:02 -0800 (PST))
> Why I like Vim:
> [...]
> 5. Can your text editor do this?
> Vim search and replace, with increment
> :let i=1 | g/foo/s//\=i."morestuff"/ | let i=i+1

I hope my editor wouldn't let me do this...

Thorsten


From kdawg44 at gmail.com  Mon Feb  2 12:05:39 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 12:05:39 -0500
Subject: Refreshing an IE Webpage
In-Reply-To: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
References: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
Message-ID: <5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>

I have also tried to do this with mechanize:

import mechanize
import time

br = mechanize.Browser()
br.open("URL")
while True:
     br.reload()
     time.sleep(300)

After a bunch of time, I get the following error:
C:\>SDE_KeepAlive-v2.py
Traceback (most recent call last):
 File "C:\SDE_KeepAlive-v2.py",
line 1
1, in <module>

 File
"C:\Python25\lib\site-packages\mechanize-0.1.9-py2.5.egg\mechanize\_mecha
nize.py", line 345, in reload
 File
"C:\Python25\lib\site-packages\mechanize-0.1.9-py2.5.egg\mechanize\_mecha
nize.py", line 257, in _mech_open
mechanize._response.httperror_seek_wrapper: HTTP Error 302: The HTTP server
retu
rned a redirect error that would lead to an infinite loop.
The last 30x error message was:
Found




And on my first code, trying to use the Win32 api, I get the following
error:

C:\> SDE_Keep_Alive.py
Traceback (most recent call last):
 File "C:\SDE_Keep_Alive.py",
line 8,
in <module>
   id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload')
pywintypes.com_error: (-2147352570, 'Unknown name.', None, None)



All I want to do is grab a page and refresh it every 5 minutes.

Thanks.

--
Kevin



On Mon, Feb 2, 2009 at 9:14 AM, K-Dawg <kdawg44 at gmail.com> wrote:

> Hi,
>
> I am trying to get and then refresh a page in IE with a Python script.  I
> just want to get a page, then refresh it every 5 minutes.  Below is the code
> I am attempting.  It is erroring out on the
> id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
> #tried with and without parens - reload & reload()
> line.  This is mostly a borrowed script I found.  The script was trying to
> call a written function on the page.  I just want to call the build in
> reload function to refresh the page.
>
> Thanks for any help.
>
> Kevin
>
>
> import win32com.client, pythoncom
> from time import sleep
>
> ie=win32com.client.Dispatch('internetexplorer.application')
> ie.Visible=1
> ie.Navigate('URL')
> sleep(5)
>
> id=ie.Document.Script._oleobj_.GetIDsOfNames('window.location.reload()')
> while True:
>     res=ie.Document.Script._oleobj_.Invoke(id, 0,
> pythoncom.DISPATCH_METHOD, True)
>     sleep(300)
>
>
-------------- next part --------------
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From thorsten at thorstenkampe.de  Mon Feb  2 12:06:38 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 2 Feb 2009 18:06:38 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <MPG.23f146877dac7c309897b9@news.individual.de>

* Aahz (2 Feb 2009 06:30:00 -0800)
> In article <874ozd3cr3.fsf at benfinney.id.au>,
> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >aahz at pythoncraft.com (Aahz) writes:
> >>
> >> Just to register a contrary opinion: I *hate* syntax highlighting
> >
> >On what basis?
> 
> It makes my eyes bleed

Ever tried sunglasses?

Thorsten


From apt.shansen at gmail.com  Mon Feb  2 12:07:57 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 09:07:57 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <873aew24ql.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
Message-ID: <7a9c25c20902020907h63c3f146y6db6268e4c761bd6@mail.gmail.com>

>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
>
> That's an odd little quirk... never noticed that before.
>
> I just use regular expressions myself.
>
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.

But what would you clean it up to?

str.find can return 0 ... which is a *true* result as that means it
finds what you're looking for at position 0... but which evaluates to
boolean False. The fact that it can also return -1 which is the
*false* result which evaluates to boolean True is just another side of
that coin.

What's the options to clean it up? It can return None when it doesn't
match and you can then test str.find("a") is None... but while that
kinda works it also goes a bit against the point of having boolean
truth/falsehood not representing success/failure of the function. 0
(boolean false) still is a success.

Raising an exception would be a bad idea in many cases, too. You can
use str.index if that's what you want.

So there's not really a great solution to "cleaning it up" . I
remember there was some talk in py-dev of removing str.find entirely
because there was no really c, but I have absolutely no idea if they
ended up doing it or not.

--S


From bruno.42.desthuilliers at websiteburo.invalid  Mon Feb  2 12:09:49 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 02 Feb 2009 18:09:49 +0100
Subject: is python Object oriented??
In-Reply-To: <67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <498728db$0$27521$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
>>> This is proven
>>> by your statement above, whereby you are driving a user away,
>>> simply because the language, in one small aspect, does not
>>> give him what he wants, and the tenor of this thread has been
>>> very much: "That's how it is - like it or lump it", and no amount
>>> of careful explanation of why people want the feature has cut
>>> any ice -
>> I'm missing the careful explanation. What I've heard is that the lack
>> of enforced encapsulation is "a danger". What I've heard is that
>> people want it because they've been told they should want it and
>> believe that. Why?
> 
> Who has said the latter? Are you just trying to spread FUD?
> 
>> There have been no "careful explanations" to answer that, in my mind.
>> And thus my response is: the practical possibility of needing access
>> vastly outweights the theoretical situation that might go bad if
>> encapsulation wasn't there. Why? Because in any real situation, IMHO,
>> *forced* encapsulation is pointless.
> 
> I think you've gotten too subjective on this matter.
 >
> You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.
> 
> Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> PLAIN FUNCTIONS (!!!!) !!!!


Aren't you going a bit over the board here ? No need to go mad nor 
scream at us.

(snip usual stuff about lack of access restriction perceived as 
dangerous or whatever - cargo cult, really...).


From google at mrabarnett.plus.com  Mon Feb  2 12:19:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 17:19:38 +0000
Subject: What is wrong in my list comprehension?
In-Reply-To: <873aew24ql.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
Message-ID: <49872B2A.1070204@mrabarnett.plus.com>

J Kenneth King wrote:
> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
>> [GCC 4.0.1 (Apple Inc. build 5484)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> bool(-1)
>> True
>>
>> str.find() returns -1 on failure (i.e. if the substring is not in the
>> given string).
>> -1 is considered boolean true by Python.
> 
> That's an odd little quirk... never noticed that before.
> 
> I just use regular expressions myself.
> 
> Wouldn't this be something worth cleaning up? It's a little confusing
> for failure to evaluate to boolean true even if the relationship isn't
> direct.
> 
str.find() returns the index (position) where the substring was found. 
Because string indexes start at 0 the returned value is -1 if it's not 
found.

In those languages where string indexes start at 1 the returned value is 
0 if not found.



From aahz at pythoncraft.com  Mon Feb  2 12:29:43 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 09:29:43 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
Message-ID: <gm7ai7$ghd$1@panix3.panix.com>

In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>* Aahz (2 Feb 2009 06:30:00 -0800)
>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>aahz at pythoncraft.com (Aahz) writes:
>>>>
>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>
>>>On what basis?
>> 
>> It makes my eyes bleed
>
>Ever tried sunglasses?

Polarized sunglasses don't work too well with LCD monitors
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From deets at nospam.web.de  Mon Feb  2 12:42:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 18:42:07 +0100
Subject: the 'right way' to distribute and access data files in a packaged
	Python module
References: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>
Message-ID: <6uopjfFgd5gdU1@mid.uni-berlin.de>

David Moss wrote:

> Hi,
> 
> I'm the author of netaddr :-
> 
>     http://pypi.python.org/pypi/netaddr/0.6
> 
> For release 0.6 I've added setuptools support so it can be distributed
> as a Python egg package using the easy_install tool.
> 
> In 0.6, I've started bundling some data files from IEEE and IANA with
> the code below the site-packages install path (lib/site-packages/
> netaddr/...). netaddr accesses and parses these files on module load
> to provide various IP and MAC address related information via its API.
> 
> This mechanism works for the setuptools based packages because on
> install they extract to the filesystem and can be accessed using
> something like :-
> 
>     >>> index = open(os.path.join(__file__, 'oui.idx'))
> 
> However, setuptools seems to perform some magic for module imports
> which prevents me from accessing these files directly as they are
> bundled inside an egg (zip) file :-(
> 
> Two questions arise out of this situation :-
> 
> 1) is there a better way to distribute the files, i.e. should I be
> using a different more correct path instead of site-packages for data?
> If so, where is this and how do I add it to my setup scripts and code?
> 
> 2) is there an easy (and portable) way for me to dive inside an egg
> file to access the data I required (ugly but workable). I'm assuming
> I'd need to check for the presence of setuptools available with the
> Python interpreter etc.
> 
> My users and I would be grateful for and help and advice.

There is a zip-safe flag that you can specify that tells setuptools that
installing your egg only works if it is unarchived. However, there is also
the pkg_resources-package that allows you to access streams from within a
package, even if it is zipped. You should investigate these two options.

Diez


From james at agentultra.com  Mon Feb  2 12:43:39 2009
From: james at agentultra.com (J Kenneth King)
Date: Mon, 02 Feb 2009 17:43:39 +0000
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
Message-ID: <87r62gzqd0.fsf@agentultra.com>

Stephen Hansen <apt.shansen at gmail.com> writes:

>>> str.find() returns -1 on failure (i.e. if the substring is not in the
>>> given string).
>>> -1 is considered boolean true by Python.
>>
>> That's an odd little quirk... never noticed that before.
>>
>> I just use regular expressions myself.
>>
>> Wouldn't this be something worth cleaning up? It's a little confusing
>> for failure to evaluate to boolean true even if the relationship isn't
>> direct.
>
> But what would you clean it up to?
>
> str.find can return 0 ... which is a *true* result as that means it
> finds what you're looking for at position 0... but which evaluates to
> boolean False. The fact that it can also return -1 which is the
> *false* result which evaluates to boolean True is just another side of
> that coin.
>
> What's the options to clean it up? It can return None when it doesn't
> match and you can then test str.find("a") is None... but while that
> kinda works it also goes a bit against the point of having boolean
> truth/falsehood not representing success/failure of the function. 0
> (boolean false) still is a success.
>
> Raising an exception would be a bad idea in many cases, too. You can
> use str.index if that's what you want.
>
> So there's not really a great solution to "cleaning it up" . I
> remember there was some talk in py-dev of removing str.find entirely
> because there was no really c, but I have absolutely no idea if they
> ended up doing it or not.
>
> --S

(Sorry all for the multiple post... my gnus fudged a bit there)

That's the funny thing about integers having boolean contexts I
guess. Here's a case where 0 actually isn't "False." Any returned value
should be considered "True" and "None" should evaluate to "False." Then
the method can be used in both contexts of logic and procedure.

(I guess that's how I'd solve it, but I can see that implementing it
is highly improbable)

I'm only curious if it's worth cleaning up because the OP's case is one
where there is more than one way to do it.

However, that's not the way the world is and I suppose smarter people
have discussed this before. If there's a link to the discussion, I'd
like to read it. It's pedantic but fascinating no less.


From tim.arnold at sas.com  Mon Feb  2 12:45:25 2009
From: tim.arnold at sas.com (Tim Arnold)
Date: Mon, 2 Feb 2009 12:45:25 -0500
Subject: Using lxml to screen scrap a site, problem with charset
References: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>
Message-ID: <gm7bfl$vf8$1@foggy.unx.sas.com>

"?????? ???????????" <gdamjan at gmail.com> wrote in message 
news:ciqh56-ses.ln1 at archaeopteryx.softver.org.mk...
> So, I'm using lxml to screen scrap a site that uses the cyrillic
> alphabet (windows-1251 encoding). The sites HTML doesn't have the <META
> ..content-type.. charset=..> header, but does have a HTTP header that
> specifies the charset... so they are standards compliant enough.
>
> Now when I run this code:
>
> from lxml import html
> doc = html.parse('http://a1.com.mk/')
> root = doc.getroot()
> title = root.cssselect(('head title'))[0]
> print title.text
>
> the title.text is ? unicode string, but it has been wrongly decoded as
> latin1 -> unicode
>
> So.. is this a deficiency/bug in lxml or I'm doing something wrong.
> Also, what are my other options here?
>
>
> I'm running Python 2.6.1 and python-lxml 2.1.4 on Linux if matters.
>
> -- 
> ?????? ( http://softver.org.mk/damjan/ )
>
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
>

The way I do that is to open the file with codecs, encoding=cp1251, read it 
into variable and feed that to the parser.

--Tim




From eric.shain at gmail.com  Mon Feb  2 12:48:53 2009
From: eric.shain at gmail.com (Eric)
Date: Mon, 2 Feb 2009 09:48:53 -0800 (PST)
Subject: Combining several text files
Message-ID: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>

This is my first post, so please advise if I'm not using proper
etiquette. I've actually searched around a bit and while I think I can
do this, I can't think of a clean elegant way. I'm pretty new to
Python, but from what I've learned so far is that there is almost
always an easier way.

I have to parse several log files. I've already written a working
parser. The log files are simple text files that when they get to a
certain size are renamed to append a number. So, you might end up
with:

filename.log.2
filename.log.1
filename.log

The higher the number, the older the file. I want to search for all
the files in a directory with "filename.log" as part of their name.
Then I can do one of two things. First I could combine them so that
the resulting file ends up with the oldest on top and newest on the
bottom. Otherwise, I could just iterate over the multiple files within
my parser.

I don't need working code (that makes things too easy), just clear
suggestions to a Python newcomer to speed me on my way.

Thanks


From mensanator at aol.com  Mon Feb  2 12:49:48 2009
From: mensanator at aol.com (Mensanator)
Date: Mon, 2 Feb 2009 09:49:48 -0800 (PST)
Subject: nth root
References: <d7ba2c50901301845n6d3ea7cbt4fb4ef6d37cb9639@mail.gmail.com><gm0mhh$dt9$1@ger.gmane.org>
	<1AE19A80523D5F40BE0044A1447A53FF0ADB972E@UNIMAIL.staff.ad.cqu.edu.au> 
	<mailman.8504.1233466604.3487.python-list@python.org>
	<f2a38da2-1f71-4f2e-ba8c-cefd38f78ee2@p2g2000prf.googlegroups.com>
	<44029925-ae8f-484e-8fcd-0d5ec484c184@z28g2000prd.googlegroups.com> 
	<9ae987f6-d7f8-4d81-a740-7bb838e328da@v5g2000pre.googlegroups.com> 
	<81c042d3-39a6-42c3-a529-7acc06d484b1@u14g2000yqg.googlegroups.com> 
	<68b1337a-1938-4765-b28a-dc526dd8e8c1@x6g2000pre.googlegroups.com>
Message-ID: <65936f1b-fd67-4234-b119-aff78babfb7d@t39g2000prh.googlegroups.com>

On Feb 2, 1:01?am, casevh <cas... at gmail.com> wrote:
> On Feb 1, 10:02?pm, Mensanator <mensana... at aol.com> wrote:
>
>
>
>
>
> > On Feb 1, 8:20 pm, casevh <cas... at gmail.com> wrote:
>
> > > On Feb 1, 1:04 pm, Mensanator <mensana... at aol.com> wrote:
>
> > > > On Feb 1, 2:27 am, casevh <cas... at gmail.com> wrote:
>
> > > > > On Jan 31, 9:36 pm, "Tim Roberts" <t.robe... at cqu.edu.au> wrote:
>
> > > > > > Actually, all I'm interested in is whether the 100 digit numbers have an exact integral root, or not. At the moment, because of accuracy concerns, I'm doing something like
>
> > > > > > for root in powersp:
> > > > > > nroot = round(bignum**(1.0/root))
> > > > > > if bignum==long(nroot)**root:
> > > > > > .........
> > > > > > which is probably very inefficient, but I can't see anything better.....
>
> > > > > > Tim
>
> > > > > Take a look at gmpy and the is_power function. I think it will do
> > > > > exactly what you want.
>
> > > > And the root function will give you the root AND tell you whether
> > > > it was an integral root:
>
> > > > >>> gmpy.root(a,13)
>
> > > > (mpz(3221), 0)
>
> > > > In this case, it wasn't.
>
> > > I think the original poster wants to know if a large number has an
> > > exact integral root for any exponent. is_power will give you an answer
> > > to that question but won't tell you what the root or exponent is. Once
> > > you know that the number is a perfect power, you can root to find the
> > > root.
>
> > But how do you know what exponent to use?
>
> That's the gotcha. :) You still need to test all prime exponents until
> you find the correct one. But it is much faster to use is_power to
> check whether or not a number has representation as a**b and then try
> all the possible exponents than to just try all the possible exponents
> on all the numbers.

Ok. I was under the impression that the OP was only interested
in the 13th root, so that is_power wouldn't necessarily be of any
use to him. If is_power returned true, you would still have to do
root(a,13) to see if it's actually a 13th power. That's executing
two gmpy functions and takes twice as much time as doing root(a,13)
alone.

>
>
>
>
>
> > > > >http://code.google.com/p/gmpy/
>
> > > > > casevh



From gagsl-py2 at yahoo.com.ar  Mon Feb  2 12:54:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 15:54:27 -0200
Subject: Extreme Yaro weirdness
References: <rNOSPAMon-078C11.00591102022009@news.gha.chartermi.net>
	<mailman.8612.1233589195.3487.python-list@python.org>
	<rNOSPAMon-ED547A.08101902022009@news.gha.chartermi.net>
Message-ID: <op.uoqj01myx6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 14:10:19 -0200, Ron Garret <rNOSPAMon at flownet.com>  
escribi?:
> In article <mailman.8612.1233589195.3487.python-list at python.org>,
>  "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>>
>> [...] you hit a known bug in cgitb - see
>> http://bugs.python.org/issue4643 for a solution.
>
> Aha!  Thank you!  That explains everything, except this:  why does the
> problem go away when I run under wsgiref and capture the request in a
> global variable?

NLMPI

(If you don't understand the acronym -very likely- ... well, you don't  
miss anything)

-- 
Gabriel Genellina



From kdawg44 at gmail.com  Mon Feb  2 12:59:27 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Mon, 2 Feb 2009 12:59:27 -0500
Subject: Refreshing an IE Webpage
In-Reply-To: <5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>
References: <5caea3690902020614h2665690cpb6e5839e26615fd7@mail.gmail.com>
	<5caea3690902020905q7cbdcf5am2e1093674dd1a178@mail.gmail.com>
Message-ID: <5caea3690902020959g2483f1d5oe4c3b8bbf0020823@mail.gmail.com>

Please disregard... I was making it harder than it had to be I think.

The following seems to be running fine.  Whether its doing what I want I
will know in a little bit if the page in my browser times out....


import win32com.client, pythoncom
from time import sleep

ie=win32com.client.Dispatch('internetexplorer.application')

> ie.Visible=0
> ie.Navigate('URL')
> sleep(5)
>
> while True:
>     sleep(240)

        ie.Refresh()

Thanks
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From philip at semanchuk.com  Mon Feb  2 13:03:20 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 2 Feb 2009 13:03:20 -0500
Subject: Calling into Python from a C thread
Message-ID: <52119CC5-1716-40EF-A0E0-570C05BEE4F1@semanchuk.com>

Hi all,
I'm trying call Python from inside of a C thread that's running in a  
Python extension I've written and I am not having much luck. My C  
thread function consists of simply this, and I get a segmentation  
fault from Python:

void start_routine(union sigval foo) {
     PyGILState_STATE gstate;

     gstate = PyGILState_Ensure();

     // Calls to Python code will go here...

     PyGILState_Release(gstate);
};

I added a printf() and can see that the fault happens *after* the call  
to PyGILState_Release(). Apparently I'm monkeying up something  
fundamental in Python, and this is really simple so I must be missing  
something big.

The context is that I'm adding support for mq_notify() to my posix_ipc  
extension. A process can register via mq_notify() to have a new thread  
started when a message appears in a message queue. I've got this  
working when my thread code is pure C, now I'm trying to add a call to  
a user-specified Python function.

Thanks
Philip


From deets at nospam.web.de  Mon Feb  2 13:05:46 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 19:05:46 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org>
	<6uo5koFg8q28U1@mid.uni-berlin.de>
	<mailman.8610.1233588630.3487.python-list@python.org>
Message-ID: <6uoqvrFgh5oeU1@mid.uni-berlin.de>

> The reason is that I see a level of abstraction that makes it kind of
> irrelevant whether something is run as a process, a thread, a time
> multiplexed mainloop, on one or more processors, wherever or
> whatever - almost like a fractal structure spread across the total
> addressable space - and I would like to use the same rules
> everywhere.  And if there are reasons for forced encapsulation
> *somewhere*, then it is more elegant (to my taste) to allow it
> *everywhere*.  - and conversely, of course.  Hence the rather
> *an der Haare herbeigezogen* (see ** below) argument
> based on the forced restrictions in processors.

Your argument would be valid if *any* of the *languages* implementing
encapsulation would offer that real isolation. None does. So where from
comes the feeling that this must be something a *language* should offer?

Sure one could envision a system where each object is running in it's
micro-process. So far, this hasn't been implemented (to the best of my
knowledge) - so making assertions about the feasibility & robustness for
running as well as for developing are somewhat "airy", don't you think?

> Given this approach, there is no reason whatever for anything
> to mess with any other thing's innards - in fact the less you know
> about it, the more robust and predictable the system becomes.

For a certain, very limited definition of robustness & predictability. 

As much as I like my OS not to go down, it's nothing that helps me to
accomplish my actual goal using it if the software running on top of it
crashes. From this POV, a chain is always only as strong as it's weakest
member. And that might well be one of your encapsulated components. 


> And in embedded processes, there exist things that are time
> critical, that are designed to be used in one way, and no other,
> and that can have serious consequences if messed with- when
> I have started moving the 100 tonne mass, then I *cannot* tolerate
> other code changing my timeouts or speeds or feeds in an arbitrary
> fashion - EXPENSIVE noises will result.

Embedded programming most often even offers the memory protection one needs
to make the "real" encapsulation, due to hardware restrictions.

And even if it did,  it won't help you with memory corruption that occurs in
process. Which is of course a re-iteration of my argument.

Again: the expensive noises haven't been avoided because of encapsulation.
They might be the product of expensive testruns, either by trial-and-error,
or by review. Not by encapsulation.

>> I've seen a lot of programs segfault that are written in C++ with data
>> encapsulation. And also a lot of them that overcame the restrictions the
>> compiler or even runtime in java imposed on them, either by
>> pointer-magic, or through some available backdoors that have been put in
>> place for good reasons.
> 
> I think that segfaulting is basically caused by programming error -
> By the inability of the programmer actually to understand the
> limitations of the compiler to "do what I mean".
> 
> Encapsulation or data hiding will never "cure" that, because
> at best it could move some of the errors from runtime to
> compile time.
> 
> I doubt the "good reasons for backdoors" part - I think that comes
> from a design that has either not been done, or used, at the correct
> level of granularity.
> 
>> So far I haven't seen any argument for forced data encapsulation that
>> went beyond a matter of personal taste. That's fine, but also just that.
> 
> This could be true, and if it is, we are just beating our heads one
> against the other, trying to win non existent prizes for pig-headedness.
> 
> I could also turn that argument around, as well as stating it stronger:
> 
> So far I have not seen any argument in favour of free access to
> the internals of another piece of code that is based on ANY necessity,
> (beside a handwaving "good reasons" ) or that goes beyond a matter
> of personal taste based on a hacker's glee in meddling in somebody
> else's code.

The argument as apparent in Python: ducktyping is used everyday, to all our
benefit. And every piece of code that only works precisely because it was
possible to access the innards of some other piece of code is an example
and a reason to allow it.

You might say that these things are showing a lack of proper design - but
the point is that design is a question of perspective, and a otherwise
useful piece of code is rendered useless because of encapsulation if that
prevents the usage from a new perspective the original author didn't think
of.

That's my stance on this, and as a coder, I want to (re)use code, not work
around it.

Diez


From vincent at vincentdavis.net  Mon Feb  2 13:08:50 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 2 Feb 2009 11:08:50 -0700
Subject: faster scipy.percentileofscore ?
Message-ID: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>

Currently I am using the following:
pgrades = [scipy.percentileofscore(grades,x) for x in grades]

I need the percentile of each number in grades. The problem is that it
takes a long time (a few minutes) because there are 15,000 items in
the list.
does anyone know is there is a faster way?

Thanks
Vincent Davis
720-301-3003


From google at mrabarnett.plus.com  Mon Feb  2 13:11:21 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 18:11:21 +0000
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <49873749.9070806@mrabarnett.plus.com>

Eric wrote:
 > This is my first post, so please advise if I'm not using proper
 > etiquette. I've actually searched around a bit and while I think I can
 > do this, I can't think of a clean elegant way. I'm pretty new to
 > Python, but from what I've learned so far is that there is almost
 > always an easier way.
 >
 > I have to parse several log files. I've already written a working
 > parser. The log files are simple text files that when they get to a
 > certain size are renamed to append a number. So, you might end up
 > with:
 >
 > filename.log.2
 > filename.log.1
 > filename.log
 >
 > The higher the number, the older the file. I want to search for all
 > the files in a directory with "filename.log" as part of their name.
 > Then I can do one of two things. First I could combine them so that
 > the resulting file ends up with the oldest on top and newest on the
 > bottom. Otherwise, I could just iterate over the multiple files within
 > my parser.
 >
 > I don't need working code (that makes things too easy), just clear
 > suggestions to a Python newcomer to speed me on my way.
 >
My suggestion is to list the filenames, sort them into descending order
by the suffix (converted to an int) (treat an unnumbered filename as one
having the suffix ".0"), and then parse them in the resulting order.


From apt.shansen at gmail.com  Mon Feb  2 13:12:33 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:12:33 -0800
Subject: is python Object oriented??
In-Reply-To: <003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
Message-ID: <7a9c25c20902021012s2bd6bd71lf82310a07a3f194b@mail.gmail.com>

>
> > >  that an underscore convention is
> > > "just as good", (It isn't),
> >
> > Why isn't it?
>
> Because it needs human intervention.
>

Not necessarily at all: that's something that could be checked very readily
with static analysis. Why isn't that a good enough tool if policy isn't
sufficient?

If you scan the code for "<target>._<something>" and target is not "self",
and <something> is not a magic method, then I think that is an encapsulation
error. I don't know that Pylint or the various other flavors of analysis
tools have an option to check for that, but wouldn't adding one be better
then changing the language? That way those who want it get the certainty
that encapsulation is never broken, and those who don't care don't have to
worry about it.


>
> > > that you could crack it if you really
> > > tried, (so what?),
> >
> > Exactly.. so what? WHY is the convention not enough? What REAL
> > situation is there that the lack of *forced* encapsulation but policy
> > based encapsulation not enough?
> >
>
> See human intervention above - and as for
> "real, forced data hiding" - have you ever
> coded anything that produced a segmentation fault?
>

[ snip discussion of processor memory protection ]

That's apples to... potatoes. I'm not opposed to memory protection :)
Segmentation faults and memoy protection are an utterly different thing. One
protects against a programmer accidentally going in and overwriting
something that he shouldn't, when he doesn't even know he's doing it.

The other protects against a programmer *intentionally* and *explicitly*
going into  source code and finding an undocumented internal detail to
*intentionally* change it for some specific purpose.

One stops someone from making a mistake. The other stops someone from doing
something they /intend/ on doing.

(Both may have an impact on someone with malicious intent, but that's a
whole other subject)

--S
P.S. Aiee, this discussion is getting overwhelmingly long. :)
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From clp2 at rebertia.com  Mon Feb  2 13:17:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 10:17:43 -0800
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <50697b2c0902021017t398b9e1fn42e5ac27fdc17da8@mail.gmail.com>

On Mon, Feb 2, 2009 at 9:48 AM, Eric <eric.shain at gmail.com> wrote:
> This is my first post, so please advise if I'm not using proper
> etiquette. I've actually searched around a bit and while I think I can
> do this, I can't think of a clean elegant way. I'm pretty new to
> Python, but from what I've learned so far is that there is almost
> always an easier way.
>
> I have to parse several log files. I've already written a working
> parser. The log files are simple text files that when they get to a
> certain size are renamed to append a number. So, you might end up
> with:
>
> filename.log.2
> filename.log.1
> filename.log
>
> The higher the number, the older the file. I want to search for all
> the files in a directory with "filename.log" as part of their name.
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
>
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

For listing the filenames, you'll want to use os.listdir:
http://docs.python.org/library/os.html#os.listdir

or possibly the `glob` module depending on your needs:
http://docs.python.org/library/glob.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Mon Feb  2 13:18:39 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:18:39 -0800
Subject: What is wrong in my list comprehension?
In-Reply-To: <87r62gzqd0.fsf@agentultra.com>
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
	<87r62gzqd0.fsf@agentultra.com>
Message-ID: <7a9c25c20902021018m7a4112edv3a282d9b0ba187a5@mail.gmail.com>

>
> I'm only curious if it's worth cleaning up because the OP's case is one
> where there is more than one way to do it.


I just think at this point ".find" is just not the right method to use;
"substring" in "string" is the way to determine what he wants is all.
".find" is useful for when you want the actual position, not when you just
want to determine if there's a match at all. The way I'd clean it is to
remove .find, personally :) I don't remember the outcome of their discussion
on py-dev, and haven't gotten around to loading up Py3 to test it out :)

I s'pose in certain contexts where catching .index's ValueError is too
expensive and just checking vs -1 is faster and speed is important, .find()
can still be useful. I don't do that much text parsing generally, so don't
know.


> However, that's not the way the world is and I suppose smarter people
> have discussed this before. If there's a link to the discussion, I'd
> like to read it. It's pedantic but fascinating no less.


The thread I remember reading was:

http://mail.python.org/pipermail/python-dev/2005-August/055704.html

It sorta digressed at a certain point :)

--S
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From duncan.booth at invalid.invalid  Mon Feb  2 13:21:24 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 2 Feb 2009 18:21:24 GMT
Subject: Membership of multiple items to a list
References: <mailman.8581.1233563066.3487.python-list@python.org>
Message-ID: <Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>

Stephen Hansen <apt.shansen at gmail.com> wrote:

> I'm re-sending this same message as the OpenPGP S/MIME attachment
> format -- just so test if its actually readable by news clients in
> general. I have absolutely no idea. Not touched a news client in years
> and years, as I said. 

It is readable in XNews, but only displays in a fixed pitch font and 
without colours to distinguish the quoted content.


From robert.kern at gmail.com  Mon Feb  2 13:28:37 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 02 Feb 2009 12:28:37 -0600
Subject: faster scipy.percentileofscore ?
In-Reply-To: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
References: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
Message-ID: <gm7e0l$9e3$1@ger.gmane.org>

On 2009-02-02 12:08, Vincent Davis wrote:
> Currently I am using the following:
> pgrades = [scipy.percentileofscore(grades,x) for x in grades]
>
> I need the percentile of each number in grades. The problem is that it
> takes a long time (a few minutes) because there are 15,000 items in
> the list.
> does anyone know is there is a faster way?

from scipy import stats
pgrades = (stats.rankdata(grades)-1) / (len(grades)-1) * 100

You will probably want to ask further scipy questions on the scipy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb  2 13:30:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 02 Feb 2009 10:30:42 -0800
Subject: Combining several text files
In-Reply-To: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <TpydnaL8Lun4phrUnZ2dnUVZ_rPinZ2d@pdx.net>

Eric wrote:
> I have to parse several log files....
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
> 
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

Look into the "glob" module to get your name list, and sort the
resulting list appropriately, then you can loop over that list.
Then you can use an iterator (similar to below) to produce lines:

     def source_lines(chronological_filenames):
         for name in chronological_filenames:
             with open(name) as source:
                  for line in source:
                      yield line

Note this uses the with statement to do file closing, so if you are
using an older Python, you may need to write it differently.

You can use this as a source of lines for your parser.

--Scott David Daniels
Scott.Daniels at Acm.Org


From apt.shansen at gmail.com  Mon Feb  2 13:35:28 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:35:28 -0800
Subject: Membership of multiple items to a list
In-Reply-To: <Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>
References: <mailman.8581.1233563066.3487.python-list@python.org>
	<Xns9BA6B5C2D5BE9duncanbooth@127.0.0.1>
Message-ID: <7a9c25c20902021035t3377b8di579c540f8a11f9b@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:21 AM, Duncan Booth
<duncan.booth at invalid.invalid>wrote:

> Stephen Hansen <apt.shansen at gmail.com> wrote:
>
> > I'm re-sending this same message as the OpenPGP S/MIME attachment
> > format -- just so test if its actually readable by news clients in
> > general. I have absolutely no idea. Not touched a news client in years
> > and years, as I said.
>
> It is readable in XNews, but only displays in a fixed pitch font and
> without colours to distinguish the quoted content.


Yeah, I gave up. I was hoping to find one common set of settings that worked
in all contexts I use this email account for, but failed :)

Oh well.

Sorry for sending junk. :) And going off-topic here. Ahem.

--S
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From vincent at vincentdavis.net  Mon Feb  2 13:36:18 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 2 Feb 2009 11:36:18 -0700
Subject: faster scipy.percentileofscore ?
In-Reply-To: <gm7e0l$9e3$1@ger.gmane.org>
References: <77e831100902021008v17408ea5u5f5467e8f0c1d5e8@mail.gmail.com>
	<gm7e0l$9e3$1@ger.gmane.org>
Message-ID: <77e831100902021036k38e14d85l5c57e250e973a79b@mail.gmail.com>

Did not know about http://www.scipy.org/Mailing_Lists but did not look,

Thanks for the help
Vincent Davis




On Mon, Feb 2, 2009 at 11:28 AM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-02 12:08, Vincent Davis wrote:
>>
>> Currently I am using the following:
>> pgrades = [scipy.percentileofscore(grades,x) for x in grades]
>>
>> I need the percentile of each number in grades. The problem is that it
>> takes a long time (a few minutes) because there are 15,000 items in
>> the list.
>> does anyone know is there is a faster way?
>
> from scipy import stats
> pgrades = (stats.rankdata(grades)-1) / (len(grades)-1) * 100
>
> You will probably want to ask further scipy questions on the scipy mailing
> list.
>
>  http://www.scipy.org/Mailing_Lists
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it
> had
>  an underlying truth."
>  -- Umberto Eco
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From lionel.keene at gmail.com  Mon Feb  2 13:36:31 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 10:36:31 -0800 (PST)
Subject: Reading text file with wierd file extension?
Message-ID: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>

Hi Folks, Python newbie here.

I'm trying to open (for reading) a text file with the following
filenaming convension:

"MyTextFile.slc.rsc"

My code is as follows:

Filepath = "C:\\MyTextFile.slc.rsc"
FileH = open(Filepath)

The above throws an IOError exception. On a hunch I changed the
filename (only the filename) and tried again:

Filepath = "C:\\MyTextFile.txt"
FileH = open(Filepath)

The above works well. I am able to open the file and read it's
contents. I assume to read a file in text file "mode" the parameter is
scanned for a ".txt" extension, otherwise the Python runtime doesn't
know what version of "open(...)" to invoke. How do I pass the original
filename (MyTextFile.slc.rsc) and get Python to open it as a text
file? Thanks in advance everyone!


From stef.mientki at gmail.com  Mon Feb  2 13:40:01 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 02 Feb 2009 19:40:01 +0100
Subject: database wrapper ?
In-Reply-To: <50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>
References: <4986289C.3030205@gmail.com>
	<50697b2c0902011543w7c022fel7c32e8e1ea7a920e@mail.gmail.com>
Message-ID: <49873E01.5060802@gmail.com>

Chris Rebert wrote:
> On Sun, Feb 1, 2009 at 2:56 PM, Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>> hello,
>>
>> Until now I used a simple wrapper around pysqlite and pyodbc to manage my
>> databases.
>> Now I'm looking for a better solution,
>> because I've to support a (for this moment) unknown database,
>> and I'm not the one who will choose the database.
>>
>> Googling, I found SQLalchemy,
>> which looks quit good.
>>
>> But as I only want to choose once,
>> I googled for  "SQLalchemy alternatives",
>> but it didn't find many answers.
>> (Storm / Grok are of no interest, because manipulating the structure of the
>> database is a key issue).
>>
>> Is SQLalchemy the best / most popular database wrapper ?
>> Are there any alternatives ?
>>     
>
> SQLObject is also probably worth looking at -- http://www.sqlobject.org/
>
> Cheers,
> Chris
>
>   
I took a brief look at the alternatives,
but I guess it's difficult to judge, without trying them all,
most information is quit fragmented.

For now, I've the "feeling" the following arguments are valid:
(If I'm telling something completely wrong, someone will correct me ;-)

positive for SQLAlchemy
- SQLObject is obsolete.  Turbo Gears has replaced SQLObject with 
SQLAlchemy.
- SQLAlchemy is better / faster supported than SQLObject.
- SQLAlchemy is faster

positive for SQLObject
- supports Sybase (which is also obsolete, but still used in my environment)

equal for both
- SQLObject is much easier, but if you put Elixer on top of SQLAlchemy, 
you've about the same easy interface.

As we've planned to replace Sybase in the not too far future, the choice 
for me seems clear.

thanks you al,
cheers,
Stef




From kyosohma at gmail.com  Mon Feb  2 13:41:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 10:41:21 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>

On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hi Folks, Python newbie here.
>
> I'm trying to open (for reading) a text file with the following
> filenaming convension:
>
> "MyTextFile.slc.rsc"
>
> My code is as follows:
>
> Filepath = "C:\\MyTextFile.slc.rsc"
> FileH = open(Filepath)
>
> The above throws an IOError exception. On a hunch I changed the
> filename (only the filename) and tried again:
>
> Filepath = "C:\\MyTextFile.txt"
> FileH = open(Filepath)
>
> The above works well. I am able to open the file and read it's
> contents. I assume to read a file in text file "mode" the parameter is
> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> know what version of "open(...)" to invoke. How do I pass the original
> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> file? Thanks in advance everyone!

The extension shouldn't matter. I tried creating a file with the same
extension as yours and Python 2.5.2 opened it and read it no problem.
I tried it in IDLE and with Wing on Windows XP. What are you using?
What's the complete traceback?

Mike


From simon at brunningonline.net  Mon Feb  2 13:52:05 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Mon, 2 Feb 2009 18:52:05 +0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <8c7f10c60902021052t2bb57cd1n5907c22de270e30c@mail.gmail.com>

2009/2/2 Lionel <lionel.keene at gmail.com>:
> Hi Folks, Python newbie here.
>
> I'm trying to open (for reading) a text file with the following
> filenaming convension:
>
> "MyTextFile.slc.rsc"

Some kind of a resource fork, perhaps? Where did the file come from?

Python doesn't do anything magic with filenames, so this must be some
sort of a fileysytem oddity, I think.

-- 
Cheers,
Simon B.


From apt.shansen at gmail.com  Mon Feb  2 13:55:26 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 10:55:26 -0800
Subject: Reading text file with wierd file extension?
In-Reply-To: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
Message-ID: <7a9c25c20902021055t6f3af7a9leca5b58d4e2ca3c2@mail.gmail.com>

>
> The above works well. I am able to open the file and read it's
> contents. I assume to read a file in text file "mode" the parameter is
> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> know what version of "open(...)" to invoke. How do I pass the original
> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> file? Thanks in advance everyone!


Python doesn't care what extension you use: it doesn't even look at it. The
full file name is passed blindly to the base OS.

To open a file in text mode, do open(filename, "r"); it opens in binary if
you do open(filename, "rb"). The filename has no impact on if its text or
binary mode.

There's something else going on here, I think, and you got misdirected from
it. Are you sure you didn't typo the Filepath slightly? Perhaps left off a \
or had a comma instead of a period -- etc? Or that the filename didn't have
some odd character in it that looked like a regular ascii character?

--S
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From mjbuchan at gmail.com  Mon Feb  2 13:55:50 2009
From: mjbuchan at gmail.com (Power Button)
Date: Mon, 2 Feb 2009 10:55:50 -0800 (PST)
Subject: Threading / Queue management
Message-ID: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>

hi there,

I wonder if anyone can help with the following. I have written a
script which polls a server and if it finds and pending orders, it
instantiates an new object (foo) - in a new thread and processes some
data. In the new object (foo), there are also some long running
processes so I am trying to create a thread pool/queue and to push
items onto the queue in the instantiated object (foo). Currently I am
creating the Queue in foo but this means I am starting up 5 new
threads every time I instantiate foo. What I want to be able to do is
create the Queue and start 5 (n) threads when my program starts and
then push items onto the queue in foo.

My question is, how can I create the Queue in my main object and set
the target function for the Thread Constructor to be a function in
foo?

Below is a code snippet if it will help explain more - as I am fairly
new to Python.

Thanks.
M


import os, threading, time
import Queue
class Foo(threading.Thread):

    def __init__(self, record):
        self.mRecord = record
        self.mQueue = None
        threading.Thread.__init__(self)

    def run(self):
	    files = self.getFiles()
	    self.sendFiles(files)
	    #snip

    def getFiles(self):
        #snip
        pass

    def sendFiles(self, files):
        self.mQueue = Queue.Queue()

        for i in range(5):
            t = threading.Thread(target=self.doSend)
            t.setDaemon(False)
            t.start()

         for f in files:
             self.mQueue.put(['ok', f])

        self.mQueue.join()

    def doSend(self):
        flag = 'ok'
        while flag != 'stop':
            flag,item = self.mQueue.get()
            if flag == 'ok':
                self.sendIt(item)

            self.mQueue.task_done()

    def sendIt(self, item):
        #snip
        pass


import sys, traceback, time
from modules.foo import Foo
from modules.bar import Bar
class Server(object):

    def startPolling(self):
        while True:
            bar = Bar(accessKey)
            pending = None
            pending = bar.getPending()

            if pending != None:
                self. processRecord(bar)
            time.sleep(10)


    def processRecord(self, record):
        Foo(record).start()



def main():
    server = Server()
    server.startPolling()

if __name__ == '__main__':
    main()


From Scott.Daniels at Acm.Org  Mon Feb  2 14:13:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 02 Feb 2009 11:13:32 -0800
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <mailman.8574.1233560394.3487.python-list@python.org>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>	<glo9ns$flv$1@zinnia.noc.ucla.edu>	<497FAFE4.4040602@gmail.com>	<83900549676010b8244969ece9319a78@preisshare.net>	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>	<f16976575cae1062e8fbdb364bca77ea@preisshare.net>	<e1a84d570902012124k7d5237dax597d95ea301eb30d@mail.gmail.com>
	<mailman.8574.1233560394.3487.python-list@python.org>
Message-ID: <WdmdnQq_EoTz2BrUnZ2dnUVZ_rfinZ2d@pdx.net>

Gabriel Rossetti wrote:
> ...
> Well, isn't tkinter being removed? 
> (http://www.python.org/dev/peps/pep-3108/)
To quote the referenced PEP:
     Rejected Ideas
     Modules that were originally suggested for removal
     ...
     * Tkinter
           o Would prevent IDLE from existing.
           o No GUI toolkit would be available out of the box.


--Scott David Daniels
Scott.Daniels at Acm.Org


From lionel.keene at gmail.com  Mon Feb  2 14:20:17 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 11:20:17 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
Message-ID: <fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>

On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hi Folks, Python newbie here.
>
> > I'm trying to open (for reading) a text file with the following
> > filenaming convension:
>
> > "MyTextFile.slc.rsc"
>
> > My code is as follows:
>
> > Filepath = "C:\\MyTextFile.slc.rsc"
> > FileH = open(Filepath)
>
> > The above throws an IOError exception. On a hunch I changed the
> > filename (only the filename) and tried again:
>
> > Filepath = "C:\\MyTextFile.txt"
> > FileH = open(Filepath)
>
> > The above works well. I am able to open the file and read it's
> > contents. I assume to read a file in text file "mode" the parameter is
> > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > know what version of "open(...)" to invoke. How do I pass the original
> > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > file? Thanks in advance everyone!
>
> The extension shouldn't matter. I tried creating a file with the same
> extension as yours and Python 2.5.2 opened it and read it no problem.
> I tried it in IDLE and with Wing on Windows XP. What are you using?
> What's the complete traceback?
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Hi Mike,

maybe it's not a "true" text file? Opening it in Microsoft Notepad
gives an unformatted view of the file (text with no line wrapping,
just the end-of-line square box character followed by more text, end-
of-line character, etc). Wordpad opens it properly i.e. respects the
end-of-line wrapping. I'm unsure of how these files are being
generated, I was just given them and told they wanted to be able to
read them.

How do I collect the traceback to post it?


From lionel.keene at gmail.com  Mon Feb  2 14:21:54 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 11:21:54 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <56eb8d9c-893a-45fc-8961-9296dea287f7@g1g2000pra.googlegroups.com>

On Feb 2, 11:20?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hi Folks, Python newbie here.
>
> > > I'm trying to open (for reading) a text file with the following
> > > filenaming convension:
>
> > > "MyTextFile.slc.rsc"
>
> > > My code is as follows:
>
> > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > FileH = open(Filepath)
>
> > > The above throws an IOError exception. On a hunch I changed the
> > > filename (only the filename) and tried again:
>
> > > Filepath = "C:\\MyTextFile.txt"
> > > FileH = open(Filepath)
>
> > > The above works well. I am able to open the file and read it's
> > > contents. I assume to read a file in text file "mode" the parameter is
> > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > know what version of "open(...)" to invoke. How do I pass the original
> > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > file? Thanks in advance everyone!
>
> > The extension shouldn't matter. I tried creating a file with the same
> > extension as yours and Python 2.5.2 opened it and read it no problem.
> > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > What's the complete traceback?
>
> > Mike- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Mike,
>
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.
>
> How do I collect the traceback to post it?- Hide quoted text -
>
> - Show quoted text -

Sorry, I forgot to mention I'm using Python 2.5 and the Python IDLE.


From dmp1991 at gmail.com  Mon Feb  2 14:24:38 2009
From: dmp1991 at gmail.com (Dave Peterson)
Date: Mon, 2 Feb 2009 11:24:38 -0800 (PST)
Subject: Python package Management GUI - New Project on Sourceforge
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com> 
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com> 
	<mailman.8568.1233550751.3487.python-list@python.org>
Message-ID: <014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>

On Feb 1, 10:57?pm, David Lyon <david.l... at preisshare.net> wrote:
> > What's wrong with Enstaller from Enthought ?
>
> for a start....
>
> onhttps://svn.enthought.com/enthought/wiki/Enstaller
>
> it claims to be depracated...

Hello,

Actually it was version 2.x and earlier that was deprecated and we
just hadn't updated that wiki page in a long time.  Thanks for
pointing that out!  I've now updated it with a bit of news at the
top.  In short Enstaller 3.x is alive and well and available from
PyPi.

We had the downtime for exactly the reason pointed out on this thread
-- which is that we found the old code to be extremely unstable as
users updated any of the dependencies on which Enstaller depended --
things such as wxPython, Traits, etc.

As of now, Enstaller 3.x is a command-line only tool but it does
provide a lot of benefits over standard setuptools -- uninstall,
update/upgrade command, found eggs aren't pre-pended to the full
sys.path but instead inserted before the containing directory, etc.
Our vision for re-implementing the GUI is to provide it via a web-
based frontend as (a) the basic libraries for that ARE included in the
standard lib and (b) we figure more people have a working web browser
than have the Python bindings to any one of various widget libraries
installed.

We'd welcome others to the project if anyone would like to help out!
Just contact us at info at enthought.com for procedures on getting repo
privileges.


From deets at nospam.web.de  Mon Feb  2 14:28:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 20:28:07 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <6uovq7FghiorU1@mid.uni-berlin.de>

> Hi Mike,
> 
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.


Sounds like a unix-line-ended textfile. Python has no problems reading 
these, and frankly I'm a bit wondering why you have that IOError -but 
then, on windows *anything* is possible.

You can try to open the file using the "rb" flag, which opens it in binary.

However, Python doesn't care about any extensions, that must be 
something else you did different.

 > How do I collect the traceback to post it?

Copy and paste from the console or wherever you run the script?

Diez


From tcp at mac.com  Mon Feb  2 14:28:19 2009
From: tcp at mac.com (Ted Pollari)
Date: Mon, 02 Feb 2009 11:28:19 -0800
Subject: Financial aid for PyCon 2009 is now available
Message-ID: <AE61720E-FFE3-4F2B-9BFE-B32E7FC5C0CC@mac.com>

I'm happy to announce that the Python Software Foundation has  
allocated some funds to help people attend PyCon 2009!

If you would like to come to PyCon but can't afford it, the PSF may be  
able to help you pay for registration, lodging/hotel costs and  
transportation (flight etc.). Please see http://us.pycon.org/2009/registration/financial-aid/ 
  for full details, or email pycon-aid at python.org with questions.






From tpollari at gmail.com  Mon Feb  2 14:28:41 2009
From: tpollari at gmail.com (ted)
Date: Mon, 2 Feb 2009 11:28:41 -0800 (PST)
Subject: Financial aid for PyCon 2009 is now available
Message-ID: <73639627-b579-4d0c-a6e3-68442fa16414@p36g2000prp.googlegroups.com>

I'm happy to announce that the Python Software Foundation has
allocated some funds to help people attend PyCon 2009!

If you would like to come to PyCon but can't afford it, the PSF may be
able to help you pay for registration, lodging/hotel costs and
transportation (flight etc.). Please see http://us.pycon.org/2009/registration/financial-aid/
for full details, or email pycon-aid at python.org with any questions.



From aahz at pythoncraft.com  Mon Feb  2 14:42:10 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 11:42:10 -0800
Subject: Where to put configuration/data files
References: <mailman.7995.1232937535.3487.python-list@python.org>
Message-ID: <gm7iai$al3$1@panix3.panix.com>

In article <mailman.7995.1232937535.3487.python-list at python.org>,
Jay Bloodworth  <jbloodworth at sc.rr.com> wrote:
>
>Is there a nice cross-platform way to figure out the Right (tm) place to
>store configuration files and other data?

For what purpose?  Global program config, user config, what?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From eric.shain at gmail.com  Mon Feb  2 14:45:20 2009
From: eric.shain at gmail.com (Eric)
Date: Mon, 2 Feb 2009 11:45:20 -0800 (PST)
Subject: Combining several text files
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
	<mailman.8623.1233598671.3487.python-list@python.org>
Message-ID: <5e8c1433-f1d5-4242-bc64-24d02725a79b@z28g2000prd.googlegroups.com>

On Feb 2, 12:17?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 2, 2009 at 9:48 AM, Eric <eric.sh... at gmail.com> wrote:
> > This is my first post, so please advise if I'm not using proper
> > etiquette. I've actually searched around a bit and while I think I can
> > do this, I can't think of a clean elegant way. I'm pretty new to
> > Python, but from what I've learned so far is that there is almost
> > always an easier way.
>
> > I have to parse several log files. I've already written a working
> > parser. The log files are simple text files that when they get to a
> > certain size are renamed to append a number. So, you might end up
> > with:
>
> > filename.log.2
> > filename.log.1
> > filename.log
>
> > The higher the number, the older the file. I want to search for all
> > the files in a directory with "filename.log" as part of their name.
> > Then I can do one of two things. First I could combine them so that
> > the resulting file ends up with the oldest on top and newest on the
> > bottom. Otherwise, I could just iterate over the multiple files within
> > my parser.
>
> > I don't need working code (that makes things too easy), just clear
> > suggestions to a Python newcomer to speed me on my way.
>
> For listing the filenames, you'll want to use os.listdir:http://docs.python.org/library/os.html#os.listdir
>
> or possibly the `glob` module depending on your needs:http://docs.python.org/library/glob.html
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

That wasn't too hard at all. I even found the construct:

logfile = [elem for elem in files if elem.find(ln) >= 0]

For my own interest, is there an easy way once I have the file names
to create a single concatenated file?

Thanks,

Eric


From mdw at distorted.org.uk  Mon Feb  2 14:50:33 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Mon, 02 Feb 2009 19:50:33 +0000
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <877i48obxy.fsf.mdw@metalzone.distorted.org.uk>

Jon Clements <joncle at googlemail.com> writes:

> "The int() type gained a bit_length method that returns the number of
> bits necessary to represent its argument in binary:"
>
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.

def nbits(x):

  ## Special cases.
  if x == 0: return 0
  elif x < 0: x = -x

  ## Find upper bound of the form 2^(2^n) >= x.
  n = 1
  while True:
    y = x >> n
    if y == 0: break
    x = y
    n <<= 1

  ## Now binary search until we're done.
  a = n
  while n > 0:
    n >>= 1
    y = x >> n
    if y > 0:
      x = y
      a += n

  return a


-- [mdw]


From rdmurray at bitdance.com  Mon Feb  2 14:55:37 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 19:55:37 +0000 (UTC)
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<mailman.8516.1233488352.3487.python-list@python.org>
	<873aew24ql.fsf@agentultra.com>
	<mailman.8615.1233594480.3487.python-list@python.org>
	<87r62gzqd0.fsf@agentultra.com>
	<7a9c25c20902021018m7a4112edv3a282d9b0ba187a5@mail.gmail.com>
Message-ID: <gm7j3p$s9q$1@ger.gmane.org>

Quoth Stephen Hansen <apt.shansen at gmail.com>:
> I just think at this point ".find" is just not the right method to use;
> "substring" in "string" is the way to determine what he wants is all.
> ".find" is useful for when you want the actual position, not when you just
> want to determine if there's a match at all. The way I'd clean it is to
> remove .find, personally :) I don't remember the outcome of their discussion
> on py-dev, and haven't gotten around to loading up Py3 to test it out :)


Python 3.0 (r30:67503, Dec 18 2008, 19:09:30) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> help(''.find)
Help on built-in function find:

find(...)
    S.find(sub[, start[, end]]) -> int
    
    Return the lowest index in S where substring sub is found,
    such that sub is contained within s[start:end].  Optional
    arguments start and end are interpreted as in slice notation.
    
    Return -1 on failure.




From kyosohma at gmail.com  Mon Feb  2 15:10:17 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 12:10:17 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
Message-ID: <1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>

On Feb 2, 1:20?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
>
>
> > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hi Folks, Python newbie here.
>
> > > I'm trying to open (for reading) a text file with the following
> > > filenaming convension:
>
> > > "MyTextFile.slc.rsc"
>
> > > My code is as follows:
>
> > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > FileH = open(Filepath)
>
> > > The above throws an IOError exception. On a hunch I changed the
> > > filename (only the filename) and tried again:
>
> > > Filepath = "C:\\MyTextFile.txt"
> > > FileH = open(Filepath)
>
> > > The above works well. I am able to open the file and read it's
> > > contents. I assume to read a file in text file "mode" the parameter is
> > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > know what version of "open(...)" to invoke. How do I pass the original
> > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > file? Thanks in advance everyone!
>
> > The extension shouldn't matter. I tried creating a file with the same
> > extension as yours and Python 2.5.2 opened it and read it no problem.
> > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > What's the complete traceback?
>
> > Mike- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Mike,
>
> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> gives an unformatted view of the file (text with no line wrapping,
> just the end-of-line square box character followed by more text, end-
> of-line character, etc). Wordpad opens it properly i.e. respects the
> end-of-line wrapping. I'm unsure of how these files are being
> generated, I was just given them and told they wanted to be able to
> read them.
>
> How do I collect the traceback to post it?

The traceback should look something like this fake one:

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    raise IOError
IOError

Just copy and paste it in your next message. The other guys are
probably right in that it is a line ending issue, but as they and I
have said, Python shouldn't care (and doesn't on my machine).

Mike


From rdmurray at bitdance.com  Mon Feb  2 15:18:30 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 2 Feb 2009 20:18:30 +0000 (UTC)
Subject: Combining several text files
References: <f0ec5289-c109-4587-a406-7381a2800d44@v5g2000pre.googlegroups.com>
Message-ID: <gm7kel$325$1@ger.gmane.org>

Quoth Eric <eric.shain at gmail.com>:
> This is my first post, so please advise if I'm not using proper
> etiquette. I've actually searched around a bit and while I think I can
> do this, I can't think of a clean elegant way. I'm pretty new to
> Python, but from what I've learned so far is that there is almost
> always an easier way.
> 
> I have to parse several log files. I've already written a working
> parser. The log files are simple text files that when they get to a
> certain size are renamed to append a number. So, you might end up
> with:
> 
> filename.log.2
> filename.log.1
> filename.log
> 
> The higher the number, the older the file. I want to search for all
> the files in a directory with "filename.log" as part of their name.
> Then I can do one of two things. First I could combine them so that
> the resulting file ends up with the oldest on top and newest on the
> bottom. Otherwise, I could just iterate over the multiple files within
> my parser.
> 
> I don't need working code (that makes things too easy), just clear
> suggestions to a Python newcomer to speed me on my way.

My first thought would be to do something like this (assuming
you are on a unix variant):

    yourscript `ls -tr filename.log*`

and then in 'yourscript' do:

    import fileinput
    for line in fileinput.input():
        #process the lines

This has the nice advantage of giving you access to the source filename
and line number within its source file of each line, in case that
is useful.

This is an example of why Python is referred to as "Batteries Included" :)

--RDM



From callen314 at gmail.com  Mon Feb  2 15:21:07 2009
From: callen314 at gmail.com (Craig Allen)
Date: Mon, 2 Feb 2009 12:21:07 -0800 (PST)
Subject: Does the Python community really follow the philospy of 
	"Community Matters?"
References: <15bc25c2-4fa7-4efa-aa66-7c403acb3cc5@f29g2000vbf.googlegroups.com>
	<2d459946-2216-42f7-87f8-9f0cde1fd060@l16g2000yqo.googlegroups.com> 
	<mailman.8346.1233294797.3487.python-list@python.org>
	<bdba45e4-d6a2-4479-b164-b4ef7ff75a7c@l37g2000vba.googlegroups.com>
Message-ID: <1580d92d-602b-4eb2-acce-3c33a3ee2301@b38g2000prf.googlegroups.com>

I think what you have found is a remarkable characteristic of this
language.  Somehow, perhaps something to do with guido or python
itself, python has a very strong non-dogmatic streak.  It's a relief
really.  If I were to pose a "is python or its community really xyz?"
I would wonder about the "one best way to do something".  One of my
first posts here was about three different ways I had built
singletons. As a result of that I was given a better way, but no one
said any of the other ways were "non-pythonic", it was more, "if you
use option one, make sure of this, if you use option two, don't forget
that"...

As such, python programmers are not there for you to feel superior.
If you want a language for a feeling of community, then it hardly
matters what language you choose, and if you want a good language,
it's secondary if the community gives you that feeling (you should get
it from the language itself).  And since there IS a python community
to go to for help, python has that covered without worrying about it
or making it a language feature.  It may seems cold, instead of giving
warm fuzzies, people will help you with tangible problems, but we are
not starting a commune.  "Uses a langague with sense of community that
advocates  for their language over others" is never in a spec.


-craig


From jervisau at gmail.com  Mon Feb  2 15:30:52 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Tue, 3 Feb 2009 07:30:52 +1100
Subject: Comparing dates?
In-Reply-To: <65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<65bde456-45cb-434d-a60f-b2c0648155a7@g39g2000pri.googlegroups.com>
Message-ID: <8e63a5ce0902021230y74718b71rb8b33b784534d92b@mail.gmail.com>

> Most
> will have functions like str[pf]time that could be used to similar
> effect.

In mysql this is:
str_to_date( '21/02/2008',  '%d/%m/%Y')

and oracle:
to_date( '21/02/2008',  'dd-mm-yyyy')

Cheers,


From lionel.keene at gmail.com  Mon Feb  2 15:33:36 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 12:33:36 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
Message-ID: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>

On Feb 2, 12:10?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 1:20?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 10:41?am, Mike Driscoll <kyoso... at gmail.com> wrote:
>
> > > On Feb 2, 12:36?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Hi Folks, Python newbie here.
>
> > > > I'm trying to open (for reading) a text file with the following
> > > > filenaming convension:
>
> > > > "MyTextFile.slc.rsc"
>
> > > > My code is as follows:
>
> > > > Filepath = "C:\\MyTextFile.slc.rsc"
> > > > FileH = open(Filepath)
>
> > > > The above throws an IOError exception. On a hunch I changed the
> > > > filename (only the filename) and tried again:
>
> > > > Filepath = "C:\\MyTextFile.txt"
> > > > FileH = open(Filepath)
>
> > > > The above works well. I am able to open the file and read it's
> > > > contents. I assume to read a file in text file "mode" the parameter is
> > > > scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > > know what version of "open(...)" to invoke. How do I pass the original
> > > > filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > > file? Thanks in advance everyone!
>
> > > The extension shouldn't matter. I tried creating a file with the same
> > > extension as yours and Python 2.5.2 opened it and read it no problem.
> > > I tried it in IDLE and with Wing on Windows XP. What are you using?
> > > What's the complete traceback?
>
> > > Mike- Hide quoted text -
>
> > > - Show quoted text -
>
> > Hi Mike,
>
> > maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > gives an unformatted view of the file (text with no line wrapping,
> > just the end-of-line square box character followed by more text, end-
> > of-line character, etc). Wordpad opens it properly i.e. respects the
> > end-of-line wrapping. I'm unsure of how these files are being
> > generated, I was just given them and told they wanted to be able to
> > read them.
>
> > How do I collect the traceback to post it?
>
> The traceback should look something like this fake one:
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? raise IOError
> IOError
>
> Just copy and paste it in your next message. The other guys are
> probably right in that it is a line ending issue, but as they and I
> have said, Python shouldn't care (and doesn't on my machine).
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Okay, I think I see what's going on. My class takes a single parameter
when it is instantiated...the file path of the data file the user
wants to open. This is of the form "someFile.slc". In the same
directory of "someFile.slc" is a resource file that (like a file
header) contains a host of parameters associated with the data file.
The resource file is of the form "someFile.slc.rsc". So, when the user
creates an instance of my class which, it invokes the __init__ method
where I add the ".rsc" extension to the original filename/path
parameter that was passed to the class "constructor". For example:

Note: try-catch blocks ommitted.

class MyUtilityClass:
    def __init__(self, DataFilepath):
        Resourcepath  = DataFilepath + ".rsc"
        DataFileH     = open(DataFilepath)
        ResourceFileH = open(Resourcepath)


Invoking this from the Python shell explicitly is no problem i.e.
"TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
is lost when I append the ".rsc" extension to the DataFilePath
parameter as above. When the __init__ method is invoked, Python will
open the data file but generates the exception with the "open
(Resourcepath)" instruction. I think it is somehow related to the
backslashes but I'm not entirely sure of this. Any ideas?

Thanks for the help folks.


From vicente.soler at gmail.com  Mon Feb  2 15:46:34 2009
From: vicente.soler at gmail.com (vsoler)
Date: Mon, 2 Feb 2009 12:46:34 -0800 (PST)
Subject: Source code for csv module
Message-ID: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>

Hi you all,

I just discovered the csv module here in the comp.lang.python group.

I have found its manual, which is publicly available, but since I am
still a newby, learning techniques, I was wondering if the source code
for this module is available.

Is it possible to have a look at it?

Thanks


From joncle at googlemail.com  Mon Feb  2 15:51:13 2009
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 2 Feb 2009 12:51:13 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
Message-ID: <55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>

On 2 Feb, 20:46, vsoler <vicente.so... at gmail.com> wrote:
> Hi you all,
>
> I just discovered the csv module here in the comp.lang.python group.
>
> I have found its manual, which is publicly available, but since I am
> still a newby, learning techniques, I was wondering if the source code
> for this module is available.
>
> Is it possible to have a look at it?
>
> Thanks

The csv module is a wrapper around a C extension. If you're happy
reading C code then downloading the Python sources will let you take a
goosey.

Jon.


From andrew at acooke.org  Mon Feb  2 15:53:00 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 2 Feb 2009 12:53:00 -0800 (PST)
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
Message-ID: <6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>

On Feb 1, 8:45?pm, a... at pythoncraft.com (Aahz) wrote:
> [...]?I for one won't participate in any list hosted on
> Google because of the need for a Google login.

hi,  just fyi, i investigated this and you can join any publicly
readable group by sending an email to the "-subscribe" address.  you
do not need a google login for this and, as far as i can tell, it then
operates for you like a normal mailing list.

for example, to subscribe to the group foo, you would send an email to
foo-subscribe at googlegroups.com.  to unsubscribe, use foo-
unsubscribe at googlegroups.com.

this isn't exactly well-publicised, but i tested it and it does work.

andrew


From dickinsm at gmail.com  Mon Feb  2 15:57:13 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Mon, 2 Feb 2009 12:57:13 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <8375c702-75f7-4bcc-85bb-068828af6a6d@f40g2000pri.googlegroups.com>

On Jan 31, 7:03?am, Jon Clements <jon... at googlemail.com> wrote:
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.

It's a bit cheeky, but:

from decimal import _nbits as nbits

should also work in 2.5.2 (but not in 2.5.1)!

Mark




From vicente.soler at gmail.com  Mon Feb  2 15:57:39 2009
From: vicente.soler at gmail.com (vsoler)
Date: Mon, 2 Feb 2009 12:57:39 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>
Message-ID: <598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com>

On 2 feb, 21:51, Jon Clements <jon... at googlemail.com> wrote:
> On 2 Feb, 20:46, vsoler <vicente.so... at gmail.com> wrote:
>
> > Hi you all,
>
> > I just discovered the csv module here in the comp.lang.python group.
>
> > I have found its manual, which is publicly available, but since I am
> > still a newby, learning techniques, I was wondering if the source code
> > for this module is available.
>
> > Is it possible to have a look at it?
>
> > Thanks
>
> The csv module is a wrapper around a C extension. If you're happy
> reading C code then downloading the Python sources will let you take a
> goosey.
>
> Jon.

I'm still interested in learning python techniques. Are there any
other modules (standard or complementary) that I can use in my
education?


From python.list at tim.thechases.com  Mon Feb  2 15:58:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 02 Feb 2009 14:58:15 -0600
Subject: Source code for csv module
In-Reply-To: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
Message-ID: <49875E67.2090703@tim.thechases.com>

> I just discovered the csv module here in the comp.lang.python
> group.

It certainly makes life easier.

> I have found its manual, which is publicly available, but
> since I am still a newby, learning techniques, I was wondering
> if the source code for this module is available.
> 
> Is it possible to have a look at it?

Yep...the source csv.py is likely already on your computer:

   >>> import csv
   >>> csv.__file__
   '/usr/lib/python2.5/csv.pyc'
   tchase at asgix2:~$ ls /usr/lib/python2.5/csv.*
   /usr/lib/python2.5/csv.py  /usr/lib/python2.5/csv.pyc


Same idea in Windows:

   >>> import csv
   >>> csv.__file__
   'C:\\Program Files\\Python24\\lib\\csv.pyc'
   c:\> dir "\Program Files\Python24\lib\csv.*"
   ...

Just about all the modules in the standard library have python 
source in this same directory, so you can spelunk within.

-tkc







From david.lyon at preisshare.net  Mon Feb  2 15:58:22 2009
From: david.lyon at preisshare.net (David Lyon)
Date: Mon, 02 Feb 2009 15:58:22 -0500
Subject: Python package Management GUI - New Project on Sourceforge
In-Reply-To: <014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>
References: <0f1ee3b4-e4c1-4ae4-9d6d-1184c6e20ce3@i24g2000prf.googlegroups.com>
	<glo9ns$flv$1@zinnia.noc.ucla.edu> <497FAFE4.4040602@gmail.com>
	<83900549676010b8244969ece9319a78@preisshare.net>
	<e1a84d570902012047y1a6394c9nabf4862580d816bf@mail.gmail.com>
	<mailman.8568.1233550751.3487.python-list@python.org>
	<014ede68-a0e8-4e4b-876d-98edef3059ec@i20g2000prf.googlegroups.com>
Message-ID: <38eb2cc708c7252ef55aca51a4b74edb@preisshare.net>

Hi Dave,

> As of now, Enstaller 3.x is a command-line only tool but it does
> provide a lot of benefits over standard setuptools -- uninstall,
> update/upgrade command, found eggs aren't pre-pended to the full
> sys.path but instead inserted before the containing directory, etc.

Sounds extremely powerful.

Maye I should be looking at offering support for driving Enstaller
to the GUI tool. I think I will...

Regards

David



From martin at marcher.name  Mon Feb  2 16:00:53 2009
From: martin at marcher.name (Martin)
Date: Mon, 2 Feb 2009 22:00:53 +0100
Subject: [2.5.1] Comparing dates?
In-Reply-To: <5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
Message-ID: <5fa6c12e0902021300u6e2d774egd8ab5c297c47bb59@mail.gmail.com>

Hi,

2009/2/2 Gilles Ganault <nospam at nospam.com>:
> Thanks guys. For those interested, here's how to perform the
> conversion from DD/MM/YYYY to YYYY-MM-DD:

as suggested, the DBA should seriously think about defining the
correct type of the column here, for intermediate use and getting
stuff to work you could use a view and define some stored procedures
on it so that inserting properly works...

---snip plain psql---
test=# CREATE table date_test(
  id serial primary key,
  the_date timestamp with time zone,
  stuff Text
);
NOTICE:  CREATE TABLE will create implicit sequence "date_test_id_seq"
for serial column "date_test.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index
"date_test_pkey" for table "date_test"
CREATE TABLE
test=# INSERT INTO date_test (the_date) VALUES ('20091231');
INSERT 0 1
test=# INSERT INTO date_test (the_date) VALUES ('20081231');
INSERT 0 1
test=# INSERT INTO date_test (the_date) VALUES ('20071231');
INSERT 0 1
test=# SELECT * from date_test;
 id |        the_date        | stuff
----+------------------------+-------
  1 | 2009-12-31 00:00:00+01 |
  2 | 2008-12-31 00:00:00+01 |
  3 | 2007-12-31 00:00:00+01 |
(3 rows)
---snap plain psql---

---snip now in python---
from datetime import datetime
d = datetime(day=21, month=21, year=2008) # use a real datetime
without string fiddling
import psycopg2
db = psycopg2.connect(host='localhost', user='test', password='test',
database='test')
cursor = db.cursor()
cursor.execute("select * from date_test where the_date < '20080221'")
# OK simple SELECT
for row in cursor:
  print row
# (3, datetime.datetime(2007, 12, 31, 0, 0,
tzinfo=<psycopg2.tz.FixedOffsetTimezone object at 0x959fe0c>), None)
## kill SQL injection stuff, also personally I find this more
convenient that fiddling with strings...
cursor.execute("select * from date_test where the_date < %s", (d, ))
for row in cursor:
  print row
(3, datetime.datetime(2007, 12, 31, 0, 0,
tzinfo=<psycopg2.tz.FixedOffsetTimezone object at 0x959fe8c>), None)
---snap now in python---



-- 
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http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

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From deets at nospam.web.de  Mon Feb  2 16:07:23 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 02 Feb 2009 22:07:23 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
Message-ID: <6up5kbFglf13U1@mid.uni-berlin.de>

Lionel schrieb:
> On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>>
>>
>>
>>
>>
>>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
>>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
>>>>> Hi Folks, Python newbie here.
>>>>> I'm trying to open (for reading) a text file with the following
>>>>> filenaming convension:
>>>>> "MyTextFile.slc.rsc"
>>>>> My code is as follows:
>>>>> Filepath = "C:\\MyTextFile.slc.rsc"
>>>>> FileH = open(Filepath)
>>>>> The above throws an IOError exception. On a hunch I changed the
>>>>> filename (only the filename) and tried again:
>>>>> Filepath = "C:\\MyTextFile.txt"
>>>>> FileH = open(Filepath)
>>>>> The above works well. I am able to open the file and read it's
>>>>> contents. I assume to read a file in text file "mode" the parameter is
>>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
>>>>> know what version of "open(...)" to invoke. How do I pass the original
>>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
>>>>> file? Thanks in advance everyone!
>>>> The extension shouldn't matter. I tried creating a file with the same
>>>> extension as yours and Python 2.5.2 opened it and read it no problem.
>>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
>>>> What's the complete traceback?
>>>> Mike- Hide quoted text -
>>>> - Show quoted text -
>>> Hi Mike,
>>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
>>> gives an unformatted view of the file (text with no line wrapping,
>>> just the end-of-line square box character followed by more text, end-
>>> of-line character, etc). Wordpad opens it properly i.e. respects the
>>> end-of-line wrapping. I'm unsure of how these files are being
>>> generated, I was just given them and told they wanted to be able to
>>> read them.
>>> How do I collect the traceback to post it?
>> The traceback should look something like this fake one:
>>
>> Traceback (most recent call last):
>>   File "<pyshell#3>", line 1, in <module>
>>     raise IOError
>> IOError
>>
>> Just copy and paste it in your next message. The other guys are
>> probably right in that it is a line ending issue, but as they and I
>> have said, Python shouldn't care (and doesn't on my machine).
>>
>> Mike- Hide quoted text -
>>
>> - Show quoted text -
> 
> Okay, I think I see what's going on. My class takes a single parameter
> when it is instantiated...the file path of the data file the user
> wants to open. This is of the form "someFile.slc". In the same
> directory of "someFile.slc" is a resource file that (like a file
> header) contains a host of parameters associated with the data file.
> The resource file is of the form "someFile.slc.rsc". So, when the user
> creates an instance of my class which, it invokes the __init__ method
> where I add the ".rsc" extension to the original filename/path
> parameter that was passed to the class "constructor". For example:
> 
> Note: try-catch blocks ommitted.
> 
> class MyUtilityClass:
>     def __init__(self, DataFilepath):
>         Resourcepath  = DataFilepath + ".rsc"
>         DataFileH     = open(DataFilepath)
>         ResourceFileH = open(Resourcepath)
> 
> 
> Invoking this from the Python shell explicitly is no problem i.e.
> "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> is lost when I append the ".rsc" extension to the DataFilePath
> parameter as above. When the __init__ method is invoked, Python will
> open the data file but generates the exception with the "open
> (Resourcepath)" instruction. I think it is somehow related to the
> backslashes but I'm not entirely sure of this. Any ideas?

This is written very slowly, so you can read it better:

Please post the traceback.

Diez


From martin at marcher.name  Mon Feb  2 16:09:18 2009
From: martin at marcher.name (Martin)
Date: Mon, 2 Feb 2009 22:09:18 +0100
Subject: database wrapper ?
In-Reply-To: <4986289C.3030205@gmail.com>
References: <4986289C.3030205@gmail.com>
Message-ID: <5fa6c12e0902021309v8743e59v6413ce9bd7894dcd@mail.gmail.com>

Hi,

2009/2/1 Stef Mientki <stef.mientki at gmail.com>:
> Googling, I found SQLalchemy,
> which looks quit good.

sqlalchemy was always enough for my needs, I recently found elixir
which is yet another wrapper around sqlalchemy. I haven't played too
much with it but it seems there are a couple of nice things, that is
elixir makes using sqlalchemy even easier.

hth
martin


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From steve at holdenweb.com  Mon Feb  2 16:18:22 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 16:18:22 -0500
Subject: Threading / Queue management
In-Reply-To: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <gm7nuu$fgq$1@ger.gmane.org>

Power Button wrote:
> hi there,
> 
> I wonder if anyone can help with the following. I have written a
> script which polls a server and if it finds and pending orders, it
> instantiates an new object (foo) - in a new thread and processes some
> data. In the new object (foo), there are also some long running
> processes so I am trying to create a thread pool/queue and to push
> items onto the queue in the instantiated object (foo). Currently I am
> creating the Queue in foo but this means I am starting up 5 new
> threads every time I instantiate foo. What I want to be able to do is
> create the Queue and start 5 (n) threads when my program starts and
> then push items onto the queue in foo.
> 
> My question is, how can I create the Queue in my main object and set
> the target function for the Thread Constructor to be a function in
> foo?
> 
This might help.

http://www.chrisarndt.de/projects/threadpool/

If not, Google around for "Python threadpool". If that doesn't help
either, come back to the list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From apt.shansen at gmail.com  Mon Feb  2 16:29:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 13:29:55 -0800
Subject: Reading text file with wierd file extension?
In-Reply-To: <c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
Message-ID: <7a9c25c20902021329y4d25d597v652410b4a185f728@mail.gmail.com>

> class MyUtilityClass:
>    def __init__(self, DataFilepath):
>        Resourcepath  = DataFilepath + ".rsc"
>        DataFileH     = open(DataFilepath)
>        ResourceFileH = open(Resourcepath)


There's nothing wrong with this code. You have to look elsewhere in your
program-- perhaps what calls it. Perhaps in the filesystem to ensure there
really happens to be a rsc for this data file (maybe it got accidentally
deleted?)

Before you do any openings, try printing like:

print repr(DataFilepath)
print repr(Resourcepath)
print os.path.exists(Resourcepath)
print os.listdir(os.dirname(Resourcepath))

Something must jump out at that point to be obviously the problem. If not
and you still get a traceback, try mailing the list the output and the
actual traceback.

--S
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From sjmachin at lexicon.net  Mon Feb  2 16:36:22 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 13:36:22 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>

On Feb 3, 6:50?am, Mark Wooding <m... at distorted.org.uk> wrote:
> Jon Clements <jon... at googlemail.com> writes:
> > "The int() type gained a bit_length method that returns the number of
> > bits necessary to represent its argument in binary:"
>
> > Any tips on how to get this in 2.5.2 as that's the production version
> > I'm stuck with.
>
> def nbits(x):
>
> ? ## Special cases.
> ? if x == 0: return 0
> ? elif x < 0: x = -x

3 can be represented in 2 bits and at the same time -3 can be
represented in 2 bits?? But 2 bits can support only 2 ** 2 == 4
different possibilities, and -3 .. 3 is 7 different integers.

> ? ## Find upper bound of the form 2^(2^n) >= x.

Possibly you mean 2 ** ( 2 ** n) >= x


From jason.scheirer at gmail.com  Mon Feb  2 16:41:33 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 2 Feb 2009 13:41:33 -0800 (PST)
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<gm41gr$c6i$01$1@news.t-online.com>
Message-ID: <8454f0fd-ce56-47aa-a450-8a01fb72d0b0@x6g2000pre.googlegroups.com>

On Feb 1, 3:37?am, Peter Otten <__pete... at web.de> wrote:
> Hussein B wrote:
> > Hey,
> > I have a log file that doesn't contain the word "Haskell" at all, I'm
> > just trying to do a little performance comparison:
> > ++++++++++++++
> > from datetime import time, timedelta, datetime
> > start = datetime.now()
> > print start
> > lines = [line for line in file('/media/sda4/Servers/Apache/
> > Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
> > print 'Number of lines contains "Haskell" = ' + ?str(len(lines))
> > end = datetime.now()
> > print end
> > ++++++++++++++
> > Well, the script is returning the whole file's lines number !!
> > What is wrong in my logic?
> > Thanks.
>
> """
> find(...)
> ? ? S.find(sub [,start [,end]]) -> int
>
> ? ? Return the lowest index in S where substring sub is found,
> ? ? such that sub is contained within s[start:end]. ?Optional
> ? ? arguments start and end are interpreted as in slice notation.
>
> ? ? Return -1 on failure.
> """
>
> a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
> context.
>
> Use
>
> [line for line in open(...) if line.find("Haskell") != -1]
>
> or, better
>
> [line for line in open(...) if "Haskell" in line]
>
> to get the expected result.
>
> Peter

Or better, group them together in a generator:

sum(line for line in open(...) if "Haskell" in line)

and avoid allocating a new list with every line that contains Haskell
in it.

http://www.python.org/dev/peps/pep-0289/


From lionel.keene at gmail.com  Mon Feb  2 16:43:26 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 13:43:26 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
Message-ID: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>

On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:

This is written very slowly, so you can read it better:

Please post without sarcasm.


This is the output from my Python shell:

>>> DatafilePath = "C:\\C8Example1.slc"
>>> ResourcefilePath = DatafilePath + ".rsc"
>>> DatafileFH = open(DatafilePath)
>>> ResourceFh = open(ResourcefilePath)
>>> DatafilePath
'C:\\C8Example1.slc'
>>> ResourcefilePath
'C:\\C8Example1.slc.rsc'

It seems to run without trouble. However, here is the offending code
in my class (followed by console output):

class C8DataType:

    def __init__(self, DataFilepath):

        try:
            DataFH = open(DataFilepath, "rb")

        except IOError, message:
            # Error opening file.
            print(message)
            return None

        ResourceFilepath = DataFilepath + ".src"

        print(DataFilepath)
        print(ResourceFilepath)

        # Try to open resource file, catch exception:
        try:
            ResourceFH = open(ResourceFilepath)

        except IOError, message:
            # Error opening file.
            print(message)
            print("Error opening " + ResourceFilepath)
            DataFH.close()
            return None

Console output when invoking as "someObject = C8DataType("C:\
\C8Example1.slc")" :

C:\C8Example1.slc
C:\C8Example1.slc.src
[Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
Error opening C:\C8Example1.slc.src


Thank you


> Lionel schrieb:
>
>
>
>
>
> > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> >>>>> Hi Folks, Python newbie here.
> >>>>> I'm trying to open (for reading) a text file with the following
> >>>>> filenaming convension:
> >>>>> "MyTextFile.slc.rsc"
> >>>>> My code is as follows:
> >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> >>>>> FileH = open(Filepath)
> >>>>> The above throws an IOError exception. On a hunch I changed the
> >>>>> filename (only the filename) and tried again:
> >>>>> Filepath = "C:\\MyTextFile.txt"
> >>>>> FileH = open(Filepath)
> >>>>> The above works well. I am able to open the file and read it's
> >>>>> contents. I assume to read a file in text file "mode" the parameter is
> >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> >>>>> know what version of "open(...)" to invoke. How do I pass the original
> >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> >>>>> file? Thanks in advance everyone!
> >>>> The extension shouldn't matter. I tried creating a file with the same
> >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> >>>> What's the complete traceback?
> >>>> Mike- Hide quoted text -
> >>>> - Show quoted text -
> >>> Hi Mike,
> >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> >>> gives an unformatted view of the file (text with no line wrapping,
> >>> just the end-of-line square box character followed by more text, end-
> >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> >>> end-of-line wrapping. I'm unsure of how these files are being
> >>> generated, I was just given them and told they wanted to be able to
> >>> read them.
> >>> How do I collect the traceback to post it?
> >> The traceback should look something like this fake one:
>
> >> Traceback (most recent call last):
> >> ? File "<pyshell#3>", line 1, in <module>
> >> ? ? raise IOError
> >> IOError
>
> >> Just copy and paste it in your next message. The other guys are
> >> probably right in that it is a line ending issue, but as they and I
> >> have said, Python shouldn't care (and doesn't on my machine).
>
> >> Mike- Hide quoted text -
>
> >> - Show quoted text -
>
> > Okay, I think I see what's going on. My class takes a single parameter
> > when it is instantiated...the file path of the data file the user
> > wants to open. This is of the form "someFile.slc". In the same
> > directory of "someFile.slc" is a resource file that (like a file
> > header) contains a host of parameters associated with the data file.
> > The resource file is of the form "someFile.slc.rsc". So, when the user
> > creates an instance of my class which, it invokes the __init__ method
> > where I add the ".rsc" extension to the original filename/path
> > parameter that was passed to the class "constructor". For example:
>
> > Note: try-catch blocks ommitted.
>
> > class MyUtilityClass:
> > ? ? def __init__(self, DataFilepath):
> > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > Invoking this from the Python shell explicitly is no problem i.e.
> > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > is lost when I append the ".rsc" extension to the DataFilePath
> > parameter as above. When the __init__ method is invoked, Python will
> > open the data file but generates the exception with the "open
> > (Resourcepath)" instruction. I think it is somehow related to the
> > backslashes but I'm not entirely sure of this. Any ideas?
>
> This is written very slowly, so you can read it better:
>
> Please post the traceback.
>
> Diez- Hide quoted text -
>
> - Show quoted text -



From drkjam at gmail.com  Mon Feb  2 16:48:14 2009
From: drkjam at gmail.com (David Moss)
Date: Mon, 2 Feb 2009 13:48:14 -0800 (PST)
Subject: the 'right way' to distribute and access data files in a packaged
	Python module
References: <715dabdd-618d-4451-a0db-ba6cf59847fc@x6g2000pre.googlegroups.com>
	<6uopjfFgd5gdU1@mid.uni-berlin.de>
Message-ID: <c60822fd-d2ab-4ebb-8fae-2b563ff00fd4@u18g2000pro.googlegroups.com>


> There is a zip-safe flag that you can specify that tells setuptools that
> installing your egg only works if it is unarchived. However, there is also
> the pkg_resources-package that allows you to access streams from within a
> package, even if it is zipped. You should investigate these two options.
>
> Diez

Exactly what I was looking for.

Thanks Diez!


From sjmachin at lexicon.net  Mon Feb  2 16:50:28 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 13:50:28 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
Message-ID: <3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>

On Feb 3, 8:07?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:

>
> This is written very slowly, so you can read it better:
>
> Please post the traceback.

*AND* please post the text of the IOError message

*AND* please do yourself a favour and move your files out of the root
directory into a directory with a meaningful name


From Russ.Paielli at gmail.com  Mon Feb  2 16:51:11 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 13:51:11 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>

On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
>
> > > This is proven
> > > by your statement above, whereby you are driving a user away,
> > > simply because the language, in one small aspect, does not
> > > give him what he wants, and the tenor of this thread has been
> > > very much: "That's how it is - like it or lump it", and no amount
> > > of careful explanation of why people want the feature has cut
> > > any ice -
>
> > I'm missing the careful explanation. What I've heard is that the lack
> > of enforced encapsulation is "a danger". What I've heard is that
> > people want it because they've been told they should want it and
> > believe that. Why?
>
> Who has said the latter? Are you just trying to spread FUD?
>
> > There have been no "careful explanations" to answer that, in my mind.
> > And thus my response is: the practical possibility of needing access
> > vastly outweights the theoretical situation that might go bad if
> > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > *forced* encapsulation is pointless.
>
> I think you've gotten too subjective on this matter. You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.
>
> Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> PLAIN FUNCTIONS (!!!!) !!!!
>
> Heck, why do we even need OOP?? Long live procedural!!
>
> We don't even need no stinkin programming languages, we could just
> program using 1's and 0's!!!!!!!!!
>
> What's with this luddite attitude, Python community?
>
> > > It has all the time been countered with statements
> > > about how the proponents of private attributes "don't need it",
> > > (as if they are plain dumb),
>
> > They don't need it. No one has shown a *real* reason why. The only
> > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > That's not a real reason. If its your project that someone is doing
> > bad in, this is a situation which can be *clearly* specified in a
> > projects policy and coding standards and can be *trivially* tested for
> > with simple static analysis in nearly all cases. The problem is the
> > person and not the code then. There's *countless* other ways that
> > person can do bad if you're allowing them to commit blindly anything
> > into your project.
>
> Aha! I see this attitude quite often among C/C++ people, regarding
> buffer overflows and uninitialized pointer dereferences: someone will
> say "C and C++ are unsafe languages because they allow you to overrun
> buffers", then a C/C++ zealot will respond "Hire some good
> programmers".
>
> SAME ATTITUDE.

I couldn't agree more.

As I said before, as an aeronautical engineer I don't know if enforced
access restriction can be added to Python without compromising or
unduly complicating the language. Maybe it can't. If that's the case,
then people should make that argument. But just saying that enforced
access restriction is useless in general is nonsense. Are we supposed
to believe that the designers of C++, Java, Ada, and Scala are all
idiots?

Several participants here keep repeating that the leading-underscore
convention is perfectly adequate. Aside from the aesthetic problem of
littering code with leading underscores, let me try to explain the
problem with leading underscores.

Suppose a library developer (or a module developer on a large team)
uses leading underscores. Now suppose that, for whatever reason
(pressure from the users, perhaps), the library developer decides to
change a "private" attribute to public. Now all occurrences of the
identifier need to be changed. If an assignment to the previously
"private" attribute is missed, no warning will be issued (because
Python allows new attributes to be added anywhere, even completely
outside the class definition itself). And if the library is widely
used, the probability of such bugs occurring is very high.

If a "private" keyword (or equivalent) were available, then the change
would need to be made in only one location rather than at every
occurrence off the identifier. That is much less error prone. Sure,
you can argue (as I'm sure someone will) that the users of the library
should be more careful. Yes they should, but why not let the language
help with such low-level details. That's what high-level languages are
for.

Several people have argued that an advantage of the leading-underscore
convention is that it tells you at every occurrence of the identifier
that it is private. Of course, the leading-underscore convention could
still be used even in combination with enforced access restriction.
But the larger point is this: that is like saying that global
parameters should be repeated as literal numbers at every occurrence
so the user can see the value instantly. Sure, that saves you the
trouble of looking up the value when you need to know it, but it also
requres that any change must be carefully made at every location. No
competent programmer would argue in favor of that.


From __peter__ at web.de  Mon Feb  2 16:55:05 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 02 Feb 2009 22:55:05 +0100
Subject: What is wrong in my list comprehension?
References: <44116a3e-0f4a-418f-9ada-dc917ec592d5@j35g2000yqh.googlegroups.com>
	<gm41gr$c6i$01$1@news.t-online.com>
	<8454f0fd-ce56-47aa-a450-8a01fb72d0b0@x6g2000pre.googlegroups.com>
Message-ID: <gm7q3k$8hv$03$1@news.t-online.com>

Jason Scheirer wrote:

> On Feb 1, 3:37?am, Peter Otten <__pete... at web.de> wrote:
>> Hussein B wrote:
>> > Hey,
>> > I have a log file that doesn't contain the word "Haskell" at all, I'm
>> > just trying to do a little performance comparison:
>> > ++++++++++++++
>> > from datetime import time, timedelta, datetime
>> > start = datetime.now()
>> > print start
>> > lines = [line for line in file('/media/sda4/Servers/Apache/
>> > Tomcat-6.0.14/logs/catalina.out') if line.find('Haskell')]
>> > print 'Number of lines contains "Haskell" = ' + ?str(len(lines))
>> > end = datetime.now()
>> > print end
>> > ++++++++++++++
>> > Well, the script is returning the whole file's lines number !!
>> > What is wrong in my logic?
>> > Thanks.
>>
>> """
>> find(...)
>> S.find(sub [,start [,end]]) -> int
>>
>> Return the lowest index in S where substring sub is found,
>> such that sub is contained within s[start:end]. ?Optional
>> arguments start and end are interpreted as in slice notation.
>>
>> Return -1 on failure.
>> """
>>
>> a.find(b) returns -1 if b is no found. -1 evaluates to True in a boolean
>> context.
>>
>> Use
>>
>> [line for line in open(...) if line.find("Haskell") != -1]
>>
>> or, better
>>
>> [line for line in open(...) if "Haskell" in line]
>>
>> to get the expected result.
>>
>> Peter
> 
> Or better, group them together in a generator:
> 
> sum(line for line in open(...) if "Haskell" in line)

You probably mean 

sum(1 for line in open(...) if "Haskell" in line)

if you want to count the lines containing "Haskell", or

sum(line.count("Haskell") for line in open(...) if "Haskell" in line)

if you want to count the occurences of "Haskell" (where the if clause is
logically superfluous, but may improve performance).
 
> and avoid allocating a new list with every line that contains Haskell
> in it.

But note that the OP stated that there were no such lines.

Peter




From python.list at tim.thechases.com  Mon Feb  2 16:58:32 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 02 Feb 2009 15:58:32 -0600
Subject: Where to put configuration/data files
In-Reply-To: <gm7iai$al3$1@panix3.panix.com>
References: <mailman.7995.1232937535.3487.python-list@python.org>
	<gm7iai$al3$1@panix3.panix.com>
Message-ID: <49876C88.6070508@tim.thechases.com>

>> Is there a nice cross-platform way to figure out the Right
>> (tm) place to store configuration files and other data?
> 
> For what purpose?  Global program config, user config, what?

I've found three main categories of settings like Aahz describes 
(of which I've used all in a single application):

global settings:
I usually keep these in the shared data-store (database or 
web-site/service).  This can include both global application 
settings such as the name of the institution running the app, or 
certain business-rules; and global user settings such as name, 
general preferences, colorschemes, etc.

machine-specific settings:
this relates to things like particular hardware configurations 
(path to the CD drive, resource-names/configurations for things 
like barcode/mag-stripe scanners, etc), or which server to 
connect to.  I usually store these in my application directory on 
Win32, or in /etc on *nix boxes.

User-specific per-machine settings:
This can include things like preferred window-layout (which may 
change depending on screen-size), stored 
passwords/authentication, cache-locations,
local document stores, etc.


There's one other odd-ball category I've seen but not used: 
portable storage on a USB drive.  It sorta crosses these 
boundaries being a bit of each (it's USB-drive specific, but can 
be moved from machine to machine).


Choose your best storage location by thinking what a user/admin 
would want for each setting.  Is it a global setting that all 
users need?  put it in a network store.  Is it something that 
pertains to a particular machine?  store it in either a 
machine-global repository or a user-specific repository accordingly.

-tkc






From kyosohma at gmail.com  Mon Feb  2 17:01:42 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 14:01:42 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>

On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> This is written very slowly, so you can read it better:
>
> Please post without sarcasm.
>
> This is the output from my Python shell:
>
> >>> DatafilePath = "C:\\C8Example1.slc"
> >>> ResourcefilePath = DatafilePath + ".rsc"
> >>> DatafileFH = open(DatafilePath)
> >>> ResourceFh = open(ResourcefilePath)
> >>> DatafilePath
>
> 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> 'C:\\C8Example1.slc.rsc'
>
> It seems to run without trouble. However, here is the offending code
> in my class (followed by console output):
>
> class C8DataType:
>
> ? ? def __init__(self, DataFilepath):
>
> ? ? ? ? try:
> ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> ? ? ? ? except IOError, message:
> ? ? ? ? ? ? # Error opening file.
> ? ? ? ? ? ? print(message)
> ? ? ? ? ? ? return None
>
> ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> ? ? ? ? print(DataFilepath)
> ? ? ? ? print(ResourceFilepath)
>
> ? ? ? ? # Try to open resource file, catch exception:
> ? ? ? ? try:
> ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> ? ? ? ? except IOError, message:
> ? ? ? ? ? ? # Error opening file.
> ? ? ? ? ? ? print(message)
> ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> ? ? ? ? ? ? DataFH.close()
> ? ? ? ? ? ? return None
>
> Console output when invoking as "someObject = C8DataType("C:\
> \C8Example1.slc")" :
>
> C:\C8Example1.slc
> C:\C8Example1.slc.src
> [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> Error opening C:\C8Example1.slc.src
>
> Thank you
>
> > Lionel schrieb:
>
> > > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > >>>>> Hi Folks, Python newbie here.
> > >>>>> I'm trying to open (for reading) a text file with the following
> > >>>>> filenaming convension:
> > >>>>> "MyTextFile.slc.rsc"
> > >>>>> My code is as follows:
> > >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> > >>>>> FileH = open(Filepath)
> > >>>>> The above throws an IOError exception. On a hunch I changed the
> > >>>>> filename (only the filename) and tried again:
> > >>>>> Filepath = "C:\\MyTextFile.txt"
> > >>>>> FileH = open(Filepath)
> > >>>>> The above works well. I am able to open the file and read it's
> > >>>>> contents. I assume to read a file in text file "mode" the parameter is
> > >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > >>>>> know what version of "open(...)" to invoke. How do I pass the original
> > >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > >>>>> file? Thanks in advance everyone!
> > >>>> The extension shouldn't matter. I tried creating a file with the same
> > >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> > >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> > >>>> What's the complete traceback?
> > >>>> Mike- Hide quoted text -
> > >>>> - Show quoted text -
> > >>> Hi Mike,
> > >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > >>> gives an unformatted view of the file (text with no line wrapping,
> > >>> just the end-of-line square box character followed by more text, end-
> > >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> > >>> end-of-line wrapping. I'm unsure of how these files are being
> > >>> generated, I was just given them and told they wanted to be able to
> > >>> read them.
> > >>> How do I collect the traceback to post it?
> > >> The traceback should look something like this fake one:
>
> > >> Traceback (most recent call last):
> > >> ? File "<pyshell#3>", line 1, in <module>
> > >> ? ? raise IOError
> > >> IOError
>
> > >> Just copy and paste it in your next message. The other guys are
> > >> probably right in that it is a line ending issue, but as they and I
> > >> have said, Python shouldn't care (and doesn't on my machine).
>
> > >> Mike- Hide quoted text -
>
> > >> - Show quoted text -
>
> > > Okay, I think I see what's going on. My class takes a single parameter
> > > when it is instantiated...the file path of the data file the user
> > > wants to open. This is of the form "someFile.slc". In the same
> > > directory of "someFile.slc" is a resource file that (like a file
> > > header) contains a host of parameters associated with the data file.
> > > The resource file is of the form "someFile.slc.rsc". So, when the user
> > > creates an instance of my class which, it invokes the __init__ method
> > > where I add the ".rsc" extension to the original filename/path
> > > parameter that was passed to the class "constructor". For example:
>
> > > Note: try-catch blocks ommitted.
>
> > > class MyUtilityClass:
> > > ? ? def __init__(self, DataFilepath):
> > > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > > Invoking this from the Python shell explicitly is no problem i.e.
> > > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > > is lost when I append the ".rsc" extension to the DataFilePath
> > > parameter as above. When the __init__ method is invoked, Python will
> > > open the data file but generates the exception with the "open
> > > (Resourcepath)" instruction. I think it is somehow related to the
> > > backslashes but I'm not entirely sure of this. Any ideas?
>
> > This is written very slowly, so you can read it better:
>
> > Please post the traceback.
>
> > Diez- Hide quoted text -
>
> > - Show quoted text -

Well, if I understand your code correctly, you pass in a filename that
exists, then you append an extension to it and expect that to change
the file's name. This doesn't work, as you only changed the string,
not the filename in the file system itself. You can probably use
os.rename() to do it. Then it should be able to open it.

Mike


From sjmachin at lexicon.net  Mon Feb  2 17:07:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 2 Feb 2009 14:07:50 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <0fbf8005-b609-44fb-9911-0ae9972df9c0@v5g2000pre.googlegroups.com>

On Feb 3, 8:43?am, Lionel <lionel.ke... at gmail.com> wrote:

> ? ? ? ? ResourceFilepath = DataFilepath + ".src"

Don't you mean ".rsc"?


From steve at holdenweb.com  Mon Feb  2 17:25:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 17:25:41 -0500
Subject: Import without executing module
In-Reply-To: <79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>	<mailman.8572.1233559153.3487.python-list@python.org>	<f2435f17-e86e-4798-856f-bfdfc09506bc@g3g2000pre.googlegroups.com>	<7a9c25c20902012336w1efeae6dre2de690943cf085b@mail.gmail.com>	<79153a2e0902012343t338dd85di9132d0c14f1b964b@mail.gmail.com>	<7a9c25c20902012358u60a5d594hef6c81fcdc437f4@mail.gmail.com>
	<79153a2e0902020042k6a8db234id906ff5a773d131f@mail.gmail.com>
Message-ID: <gm7rt7$sji$1@ger.gmane.org>

Taskinoor Hasan wrote:
[...]
> It make sense :-).  So my reasoning......let A is imported in B, i.e.
> name A is put in B's namespace. When we call something like A.a then the
> interpreter first resolve A in B's namespace, then to get a, it need to
> look up A's namespace. And there is no way to populate A's namespace
> without executing A, and as all statements, including 'def', 'class'
> etc., are treated in the same way, whole script need to be executed.
> 
> So whether a script can be imported as module or not is mainly dependent
> on how the script is written and largely on the intention of the coder.
> 
That's right!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Mon Feb  2 17:33:50 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 14:33:50 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
Message-ID: <b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>

On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > This is written very slowly, so you can read it better:
>
> > Please post without sarcasm.
>
> > This is the output from my Python shell:
>
> > >>> DatafilePath = "C:\\C8Example1.slc"
> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > >>> DatafileFH = open(DatafilePath)
> > >>> ResourceFh = open(ResourcefilePath)
> > >>> DatafilePath
>
> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > 'C:\\C8Example1.slc.rsc'
>
> > It seems to run without trouble. However, here is the offending code
> > in my class (followed by console output):
>
> > class C8DataType:
>
> > ? ? def __init__(self, DataFilepath):
>
> > ? ? ? ? try:
> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > ? ? ? ? except IOError, message:
> > ? ? ? ? ? ? # Error opening file.
> > ? ? ? ? ? ? print(message)
> > ? ? ? ? ? ? return None
>
> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > ? ? ? ? print(DataFilepath)
> > ? ? ? ? print(ResourceFilepath)
>
> > ? ? ? ? # Try to open resource file, catch exception:
> > ? ? ? ? try:
> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > ? ? ? ? except IOError, message:
> > ? ? ? ? ? ? # Error opening file.
> > ? ? ? ? ? ? print(message)
> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > ? ? ? ? ? ? DataFH.close()
> > ? ? ? ? ? ? return None
>
> > Console output when invoking as "someObject = C8DataType("C:\
> > \C8Example1.slc")" :
>
> > C:\C8Example1.slc
> > C:\C8Example1.slc.src
> > [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> > Error opening C:\C8Example1.slc.src
>
> > Thank you
>
> > > Lionel schrieb:
>
> > > > On Feb 2, 12:10 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >> On Feb 2, 1:20 pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > >>> On Feb 2, 10:41 am, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >>>> On Feb 2, 12:36 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > > >>>>> Hi Folks, Python newbie here.
> > > >>>>> I'm trying to open (for reading) a text file with the following
> > > >>>>> filenaming convension:
> > > >>>>> "MyTextFile.slc.rsc"
> > > >>>>> My code is as follows:
> > > >>>>> Filepath = "C:\\MyTextFile.slc.rsc"
> > > >>>>> FileH = open(Filepath)
> > > >>>>> The above throws an IOError exception. On a hunch I changed the
> > > >>>>> filename (only the filename) and tried again:
> > > >>>>> Filepath = "C:\\MyTextFile.txt"
> > > >>>>> FileH = open(Filepath)
> > > >>>>> The above works well. I am able to open the file and read it's
> > > >>>>> contents. I assume to read a file in text file "mode" the parameter is
> > > >>>>> scanned for a ".txt" extension, otherwise the Python runtime doesn't
> > > >>>>> know what version of "open(...)" to invoke. How do I pass the original
> > > >>>>> filename (MyTextFile.slc.rsc) and get Python to open it as a text
> > > >>>>> file? Thanks in advance everyone!
> > > >>>> The extension shouldn't matter. I tried creating a file with the same
> > > >>>> extension as yours and Python 2.5.2 opened it and read it no problem.
> > > >>>> I tried it in IDLE and with Wing on Windows XP. What are you using?
> > > >>>> What's the complete traceback?
> > > >>>> Mike- Hide quoted text -
> > > >>>> - Show quoted text -
> > > >>> Hi Mike,
> > > >>> maybe it's not a "true" text file? Opening it in Microsoft Notepad
> > > >>> gives an unformatted view of the file (text with no line wrapping,
> > > >>> just the end-of-line square box character followed by more text, end-
> > > >>> of-line character, etc). Wordpad opens it properly i.e. respects the
> > > >>> end-of-line wrapping. I'm unsure of how these files are being
> > > >>> generated, I was just given them and told they wanted to be able to
> > > >>> read them.
> > > >>> How do I collect the traceback to post it?
> > > >> The traceback should look something like this fake one:
>
> > > >> Traceback (most recent call last):
> > > >> ? File "<pyshell#3>", line 1, in <module>
> > > >> ? ? raise IOError
> > > >> IOError
>
> > > >> Just copy and paste it in your next message. The other guys are
> > > >> probably right in that it is a line ending issue, but as they and I
> > > >> have said, Python shouldn't care (and doesn't on my machine).
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Okay, I think I see what's going on. My class takes a single parameter
> > > > when it is instantiated...the file path of the data file the user
> > > > wants to open. This is of the form "someFile.slc". In the same
> > > > directory of "someFile.slc" is a resource file that (like a file
> > > > header) contains a host of parameters associated with the data file.
> > > > The resource file is of the form "someFile.slc.rsc". So, when the user
> > > > creates an instance of my class which, it invokes the __init__ method
> > > > where I add the ".rsc" extension to the original filename/path
> > > > parameter that was passed to the class "constructor". For example:
>
> > > > Note: try-catch blocks ommitted.
>
> > > > class MyUtilityClass:
> > > > ? ? def __init__(self, DataFilepath):
> > > > ? ? ? ? Resourcepath ?= DataFilepath + ".rsc"
> > > > ? ? ? ? DataFileH ? ? = open(DataFilepath)
> > > > ? ? ? ? ResourceFileH = open(Resourcepath)
>
> > > > Invoking this from the Python shell explicitly is no problem i.e.
> > > > "TestH = open("C:\\TestResourceFile.slc.rsc") works. BUT...something
> > > > is lost when I append the ".rsc" extension to the DataFilePath
> > > > parameter as above. When the __init__ method is invoked, Python will
> > > > open the data file but generates the exception with the "open
> > > > (Resourcepath)" instruction. I think it is somehow related to the
> > > > backslashes but I'm not entirely sure of this. Any ideas?
>
> > > This is written very slowly, so you can read it better:
>
> > > Please post the traceback.
>
> > > Diez- Hide quoted text -
>
> > > - Show quoted text -
>
> Well, if I understand your code correctly, you pass in a filename that
> exists, then you append an extension to it and expect that to change
> the file's name. This doesn't work, as you only changed the string,
> not the filename in the file system itself. You can probably use
> os.rename() to do it. Then it should be able to open it.
>
> Mike- Hide quoted text -
>
> - Show quoted text -

Hello Mike,

I'm sorry, I'm not making myself clear. I have two files in my root
directory: "C8Example1.slc" and "C8Example1.slc.rsc". (They are just
in the root directory for testing for the time being). The ".slc" file
contains the data and the ".slc.rsc" file contains the info necessary
to extract it (datatype, width, height, etc). I know a priori that the
header file will always be in the same directory and have the same
name as the data file with the exception that it will have ".rsc"
appended to its name. Therefore, when the user passes the data file
name and path as a string to the class, I check the parameter by
seeing if I can read to that filepath. If so, I simply add ".rsc" to
the end of the parameter string and try to read to that new filepath/
name in order to acquire the header information. This works when
typing it directly into the shell script (see above), but not when
coded in my class.

The IOError is printed above, but being a newbie I'm unsure of how to
see the traceback. I've only been using these tools for a couple of
days.


From steve at holdenweb.com  Mon Feb  2 17:34:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 02 Feb 2009 17:34:51 -0500
Subject: Membership of multiple items to a list
In-Reply-To: <fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
Message-ID: <gm7sed$sji$2@ger.gmane.org>

Stephen Hansen wrote:
> On Sun, Feb 1, 2009 at 7:47 PM, Ben Finney
> <bignose+hates-spam at benfinney.id.au> wrote:
>> rdmurray at bitdance.com writes:
>>
>>> I don't even see Stephen Hansen's posts. My newsreader just shows
>>> the header and says "[HTML part not displayed]".
>>
>> Likewise.
> 
> Yeah, I know HTML is bad on newsgroups. I didn't realize that when I
> installed FireGPG to sign messages while in Gmail that it started
> handling my html/plain text content differently.
> 
> Oops.
> 
> That said: Is S/MIME / OpenPGP readable on these various clients?
> There's no HTML, the text body is just encoded in base64.
> 
> I haven't actually subscribed to a usenet newsgroup in eons upon eons.
> If its not readable as S/MIME then I'll switch to inline PGP... that's
> just a slightly terrible solution for other places I have to talk and
> I'll have to take extra care to remember to manually check the settings
> based upon where I'm talking.
> 
Or configure multiple personalities with the same email address but
different settings, so all you have to do is switch personalities
appropriately.

> I'm re-sending this same message as the OpenPGP S/MIME attachment format
> -- just so test if its actually readable by news clients in general. I
> have absolutely no idea. Not touched a news client in years and years,
> as I said.
> 
> Sorry for the inconvenience.

I run Thunderbird with the OpenPGP add-on, and I hadn't noticed anything
at all strange about your posts :).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From kurt.forrester.fec at googlemail.com  Mon Feb  2 17:35:48 2009
From: kurt.forrester.fec at googlemail.com (Kurt Forrester)
Date: Mon, 02 Feb 2009 22:35:48 +0000
Subject: MySQLdb and MySQL stored functions
Message-ID: <1233614148.14298.4.camel@macbook>

Hello All,


I am running 
 - Ubuntu 8.10
 - Python 2.5.2
 - MySQLdb (1, 2, 2, 'final', 0)
 - MySQL Server/Client 5.0.67

I am trying to write an authentication script for a python application
that connects to a MySQL database. The database has a table named `user`
which has the fields `id`, `alias` and `password` as well as a stored
function `authenticate` as detailed below:

	CREATE DEFINER=`root`@`localhost` FUNCTION `authenticate`(a TEXT, p
TEXT) RETURNS int(11)
		BEGIN
			DECLARE STATUS INT DEFAULT -1;
				SELECT id INTO STATUS FROM user WHERE alias = a AND password = p;
		RETURN STATUS;
		END

table: 	`user`
	`id` = 1
	`alias` = 'captain'
	`password' = 'a'

I have been executing the following query from various connections:
	`SELECT authenticate('captain', 'a')` (this is what is in the table and
should return 1)
and
	`SELECT authenticate('captain', 'aa')` (this is a incorrect version of
the password and should return -1)

I have tried running this query from the MySQL Query Browser and it
returns results as expected.
I have also tried query from python using the _mysql module and this
also returns results as expected.
However, when I try to use the MySQLdb module it returns an incorrect
value (it returns 1).

I wish to use the DB API 2.0 compliant module for flexibility. Therefore
I am trying to work out why the MySQLdb does not return the value as
expected (that is as it is returned by the Query Browser).

Any help would be greatly appreciated.

Kurt
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From lionel.keene at gmail.com  Mon Feb  2 17:37:10 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 14:37:10 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<0fbf8005-b609-44fb-9911-0ae9972df9c0@v5g2000pre.googlegroups.com>
Message-ID: <1f06f9ce-e3e4-4f62-8eca-5db11e73237d@v39g2000pro.googlegroups.com>

On Feb 2, 2:07?pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 3, 8:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> Don't you mean ".rsc"?

Good Grief!!! That's It!! I've been staring at it all day and I didn't
see it.

I'm sorry I've wasted everyone's time. This is bloody embarassing.
Amateur night.

Thank you for the help everyone.

-L


From minesh at gmail.com  Mon Feb  2 17:39:39 2009
From: minesh at gmail.com (Minesh Patel)
Date: Mon, 2 Feb 2009 14:39:39 -0800
Subject: Python patch module
Message-ID: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>

Hi,
I was wondering if there is any patch management module for Python.
Basically I am looking to only apply a hunk from a patch if the file
exists.

-- 
Thanks,
Minesh


From darcy at druid.net  Mon Feb  2 17:40:26 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 2 Feb 2009 17:40:26 -0500
Subject: Membership of multiple items to a list
In-Reply-To: <gm7sed$sji$2@ger.gmane.org>
References: <87myd51ouw.fsf@benfinney.id.au>
	<fqovlg05xeuah0h0omUYAxe124vaj_firegpg@mail.gmail.com>
	<gm7sed$sji$2@ger.gmane.org>
Message-ID: <20090202174026.16629f0f.darcy@druid.net>

On Mon, 02 Feb 2009 17:34:51 -0500
Steve Holden <steve at holdenweb.com> wrote:
> Or configure multiple personalities with the same email address but
> different settings, so all you have to do is switch personalities
> appropriately.

They have pills for that now.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From digitig at gmail.com  Mon Feb  2 17:46:43 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 2 Feb 2009 22:46:43 +0000
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <aee48b3c0902021446nf6716d8sbe600325b8bd3e3a@mail.gmail.com>

2009/2/2 Russ P. <Russ.Paielli at gmail.com>:

> Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?

No, we're supposed to believe that the designers of C++, Java, Ada,
and Scala are all designers of languages that are not Python. If all
languages had the same philosophy what would be the point of different
languages? Is it worth mentioning (again) that Python is not Java?

-- 
Tim Rowe


From casevh at gmail.com  Mon Feb  2 17:47:47 2009
From: casevh at gmail.com (casevh)
Date: Mon, 2 Feb 2009 14:47:47 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
Message-ID: <6508f883-9d87-4583-b086-12429a714a96@g1g2000pra.googlegroups.com>

On Jan 30, 11:03?pm, Jon Clements <jon... at googlemail.com> wrote:
> Hi Group,
>
> This has a certain amount of irony (as this is what I'm pretty much
> after):-
> Fromhttp://docs.python.org/dev/3.0/whatsnew/3.1.html:
> "The int() type gained a bit_length method that returns the number of
> bits necessary to represent its argument in binary:"
>
> Any tips on how to get this in 2.5.2 as that's the production version
> I'm stuck with.
>
> Cheers,
>
> Jon.

If performance does become an issue, the newly released gmpy 1.04
includes bit_length().

casevh


From kyrie at uh.cu  Mon Feb  2 17:48:58 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 2 Feb 2009 17:48:58 -0500
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <200902021748.59161.kyrie@uh.cu>

On Monday 02 February 2009 04:51:11 pm Russ P. wrote:
> As I said before, as an aeronautical engineer I don't know if enforced
> access restriction can be added to Python without compromising or
> unduly complicating the language. Maybe it can't. If that's the case,
> then people should make that argument. But just saying that enforced
> access restriction is useless in general is nonsense. Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?

I'm amazed at how quickly this thread degenerated into another 'enforced data 
hiding' thread. I think the previous one ran long enough for me to actually 
say that 'access restriction is nonsense', when my point had been '_enforced_ 
access restrictions in python is worthless in all the examples provided so 
far' (except perhaps the extensions modules, but those are not python).

You are an aeronautical engineer. You, and I understand that, don't want, 
shouldn't want, and will not want to run anything you cannot trust. You want 
the most assurances you can get. You are well within your right to want 
that - to disallow in your systems, and in the systems that you build, 
anything that you even suspect that may threaten the integrity of the system, 
and let's face it, breaking the encapsulation, intentional or not, is pretty 
suspicious.

So, in current python, _you_ have the _choice_ of preventing it. As the checks 
are static, of course, you can break them in runtime, just like you would in 
C, C++ and Java.

But somehow, it is not enough for you that you have the choice, because that 
also gives _me_ the choice of _not_ doing it in my own systems. And you still 
haven't said why it bothers you that I have the choice.

Now, if you were arguing for [truly optional - as in, the user decides] 
dynamic checks, you may see a very different position. That RExec and Bastion 
even existed should tell you that there is interest on implementing some kind 
of trusted execution (as in 'I trust this code to do whatever it wants, but 
not this other code'). That both projects failed should tell you that either 
it is impossible to achieve in python (which would be bad), or that there is 
just not enough interest on keeping them (which would not amaze me). But, if 
you are arguing for dynamic checks, those are not present in C++ either, and 
thus, it isn't really what you mean with enforced data hiding.

> If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.

Good coding standards would prevent that. And by good coding standards, I 
mean "treat pylint and similar tools as a requirement before executing any 
code", and it will catch that sort of bugs. Again, _you_ have the choice. Use 
it if you wish.

Now, I'm with you in that accidental variable creation is a nasty side effect 
of python dynamism (and that you may be forfeiting it if you go the pylint 
route). But that particular complaint has nothing to do with enforced vs 
not-enforced data hiding, and everything to do with static typing. And mind 
you, must of us who use python, do so _because_ of the dynamism and not in 
spite of it.

Funny thing is, you have the choice, _now, today_, of having your precious 
static checks, both of them, for your projects. But you keep complaining 
because I also have the choice, and I may chose not to have them.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From fredbasset1000 at gmail.com  Mon Feb  2 18:03:18 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Mon, 2 Feb 2009 15:03:18 -0800 (PST)
Subject: Where & how to deallocate resources in Python C extension
Message-ID: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>

Hi,

I've written a C extension, see code below, to provide a Python
interface to a hardware watchdog timer.  As part of the initialization
it makes some calls to mmap, I am wondering should I be making
balanced calls to munmap in some kind of de-init function?  Do Python
extensions have d'tors?

Thanks for any help,
Fred

----------------------------------------------------------------------------------------------
#include <Python.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>
#include <errno.h>

static const uint8_t WD_PAT_VALUE = 0x05; // hard coded value to
indicate a pat to the watchdog

static uint8_t* wdt_control = NULL;
static uint8_t* wdt_feed = NULL;

/*!
    \brief Initialize the watchdog timer and start it.

    \param[in] int timeout_period, value to pass to timeout register
0x00 - 0x07, see table above.
    \return void
*/
static PyObject* init(PyObject *self, PyObject *args) {
    int period;
    int fd;

    if (!PyArg_Parse(args, "(i)", &period)) {
        PyErr_SetString(PyExc_TypeError, "single integer argument
expected");
        return NULL;
    }
    if (period <= 0x00 || period >= 0x07) {
        PyErr_SetString(PyExc_ValueError, "watchdog reg. value out of
range (0x00 to 0x07 only)");
        return NULL;
    }

    fd = open("/dev/mem", O_RDWR | O_SYNC);
    if (fd == -1) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }
    wdt_control = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0x23800000);
    if (wdt_control == MAP_FAILED) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }

    wdt_feed = mmap(0, getpagesize(), PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0x23C00000);
    if (wdt_feed == MAP_FAILED) {
        PyErr_SetString(PyExc_SystemError, strerror(errno));
        return NULL;
    }

    *wdt_feed = WD_PAT_VALUE;   // must first pat the w.d. before
setting period
    *wdt_control = period;

    Py_INCREF(Py_None);
    return Py_None;
}

/*!
    \brief Pat the watchdog timer once.
    Always call init() before calling this function.

    \return void
*/
static PyObject* pat(PyObject *self, PyObject *args)
{
    if (!PyArg_Parse(args, "( )")) { // verify no args passed
        return NULL;
    }

    if (wdt_feed != NULL) {
        *wdt_feed = WD_PAT_VALUE;
    }

    Py_INCREF(Py_None);
    return Py_None;
}

// method registration table
static struct PyMethodDef wdt_methods[] = {
    {"init", init, METH_VARARGS},
    {"pat", pat, METH_VARARGS},
    {NULL, NULL}
};

// module initializer, called on first import
void initwdtmodule() {
    (void) Py_InitModule("wdtmodule", wdt_methods);
}


From robert.kern at gmail.com  Mon Feb  2 18:05:40 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 02 Feb 2009 17:05:40 -0600
Subject: Python patch module
In-Reply-To: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>
References: <b804d5d90902021439g728d4ac1o27430829d4d445be@mail.gmail.com>
Message-ID: <gm7u84$5hc$1@ger.gmane.org>

On 2009-02-02 16:39, Minesh Patel wrote:
> Hi,
> I was wondering if there is any patch management module for Python.
> Basically I am looking to only apply a hunk from a patch if the file
> exists.

Google's diff-match-patch library might be up your alley.

http://code.google.com/p/google-diff-match-patch/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Russ.Paielli at gmail.com  Mon Feb  2 18:20:52 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 15:20:52 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com> 
	<mailman.8649.1233614806.3487.python-list@python.org>
Message-ID: <da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>

On Feb 2, 2:46 pm, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/2 Russ P. <Russ.Paie... at gmail.com>:
>
> > Are we supposed
> > to believe that the designers of C++, Java, Ada, and Scala are all
> > idiots?
>
> No, we're supposed to believe that the designers of C++, Java, Ada,
> and Scala are all designers of languages that are not Python. If all
> languages had the same philosophy what would be the point of different
> languages? Is it worth mentioning (again) that Python is not Java?
>
> --
> Tim Rowe

I am not sure why people keep "mentioning" that "Python is not Java."
As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
either. All of those languages have enforced access restriction. Why
only mention Java?

For the record, I have never used Java, nor do I have any desire to
ever use it. That is why I am intrigued by the apparent obsession with
it here. I suspect that many programmers are forced to use against
their wishes. If that's the case, you have my sympathies, but let's
not pretend that Java is the only popular OO language with enforced
access restrictions.


From google at mrabarnett.plus.com  Mon Feb  2 18:25:13 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 02 Feb 2009 23:25:13 +0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <498780D9.40603@mrabarnett.plus.com>

Lionel wrote:
> On Feb 2, 1:07 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> 
> This is written very slowly, so you can read it better:
> 
> Please post without sarcasm.
> 
> 
> This is the output from my Python shell:
> 
>>>> DatafilePath = "C:\\C8Example1.slc"
>>>> ResourcefilePath = DatafilePath + ".rsc"
>>>> DatafileFH = open(DatafilePath)
>>>> ResourceFh = open(ResourcefilePath)
>>>> DatafilePath
> 'C:\\C8Example1.slc'
>>>> ResourcefilePath
> 'C:\\C8Example1.slc.rsc'
> 
Here the extension is '.rsc' ...

> It seems to run without trouble. However, here is the offending code
> in my class (followed by console output):
> 
> class C8DataType:
> 
>     def __init__(self, DataFilepath):
> 
>         try:
>             DataFH = open(DataFilepath, "rb")
> 
>         except IOError, message:
>             # Error opening file.
>             print(message)
>             return None
> 
>         ResourceFilepath = DataFilepath + ".src"
> 
... but here the extension is '.src'.

Is that the problem.

>         print(DataFilepath)
>         print(ResourceFilepath)
> 
>         # Try to open resource file, catch exception:
>         try:
>             ResourceFH = open(ResourceFilepath)
> 
>         except IOError, message:
>             # Error opening file.
>             print(message)
>             print("Error opening " + ResourceFilepath)
>             DataFH.close()
>             return None
> 
> Console output when invoking as "someObject = C8DataType("C:\
> \C8Example1.slc")" :
> 
> C:\C8Example1.slc
> C:\C8Example1.slc.src
> [Errno 2] No such file or directory: 'C:\\C8Example1.slc.src'
> Error opening C:\C8Example1.slc.src
> 
[snip]
It can't find "C:\C8Example1.slc.src", but I think you intended 
"C:\C8Example1.slc.rsc".


From tutufan at gmail.com  Mon Feb  2 18:27:33 2009
From: tutufan at gmail.com (Mike)
Date: Mon, 2 Feb 2009 15:27:33 -0800 (PST)
Subject: handy way to spot-profile a python program (watch+pstat+tac)
Message-ID: <87a8941c-233c-4790-9578-9d2660eafa9c@i18g2000prf.googlegroups.com>

Someone (forget who) mentioned recently that you could get some "poor
man's" profiling info by attaching to a running python with gdb, and
periodically grabbing a stack trace.

I figured out that there's a handy way to do this with this command:

    watch -n 1 'pstack 30154 | tac'

which will show a full-screen stack dump once per second on the python
with pid 30154.  (It works with non-Python, too--the 'p' is apparently
for "process", not "python".)

If the interesting part runs off the bottom of your screen, you can
always leave off the tac, though that makes it a bit jumpier.

(pstack uses the ptrace interface, which may annoy the parents of this
process if they're paying attention (which is not usually the case).)

Have fun,
Mike


From demirbaris at gmail.com  Mon Feb  2 18:40:22 2009
From: demirbaris at gmail.com (Baris Demir)
Date: Tue, 03 Feb 2009 00:40:22 +0100
Subject: function scope
Message-ID: <49878466.9010503@gmail.com>

Hi everybody,

I am quite new to python and using it for my thesis.  Luckily I found 
out some kind of behavior surprising to me and so unwanted in my code. I 
could not find any explanation, so solution for the code.
It is simply like this:

/*li = another_module.global_variable
f=simpleCut(li)

def simpleCut(d=dict()):
       temp=d
       for i in temp.keys():
           if    (temp[i] == .......) :
              temp[i]=new_value
return temp
*/
here /*simpleCut(d=dict())*/ is a function that changes the value of the 
key in the d if it satisfies conditions and returns the new dictionary.
what i do not understand is, when i checked the original dictionary 
/*li,*/ i also found out that, the value of that key(operated in the if 
statement) had also been changed. so, simply, the simpleCut function 
also changes the variables of its own argument, even there is a 'temp' 
variable. That is a scandal for my code:)

please tell me, if this is not possible and i am missing another thing 
in my code, or if this kind of behavior is possible, what is the 
philosophy of it, and how can i change it???

cheers

B.D.
   
   
   


From benjamin.kaplan at case.edu  Mon Feb  2 18:58:05 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 2 Feb 2009 18:58:05 -0500
Subject: is python Object oriented??
In-Reply-To: <26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <ec96e1390902021558j69ab7ad7tf118756e093785c@mail.gmail.com>

On Mon, Feb 2, 2009 at 4:51 PM, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> > On Feb 2, 2:55 am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> >
> > > > This is proven
> > > > by your statement above, whereby you are driving a user away,
> > > > simply because the language, in one small aspect, does not
> > > > give him what he wants, and the tenor of this thread has been
> > > > very much: "That's how it is - like it or lump it", and no amount
> > > > of careful explanation of why people want the feature has cut
> > > > any ice -
> >
> > > I'm missing the careful explanation. What I've heard is that the lack
> > > of enforced encapsulation is "a danger". What I've heard is that
> > > people want it because they've been told they should want it and
> > > believe that. Why?
> >
> > Who has said the latter? Are you just trying to spread FUD?
> >
> > > There have been no "careful explanations" to answer that, in my mind.
> > > And thus my response is: the practical possibility of needing access
> > > vastly outweights the theoretical situation that might go bad if
> > > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > > *forced* encapsulation is pointless.
> >
> > I think you've gotten too subjective on this matter. You might as well
> > say that we don't need no stinkin' OOP, we could all just be
> > programming with goto's.
> >
> > Sure, hey, let's do OOP in C, using structs, POD STRUCTS (!!!!), and
> > PLAIN FUNCTIONS (!!!!) !!!!
> >
> > Heck, why do we even need OOP?? Long live procedural!!
> >
> > We don't even need no stinkin programming languages, we could just
> > program using 1's and 0's!!!!!!!!!
> >
> > What's with this luddite attitude, Python community?
> >
> > > > It has all the time been countered with statements
> > > > about how the proponents of private attributes "don't need it",
> > > > (as if they are plain dumb),
> >
> > > They don't need it. No one has shown a *real* reason why. The only
> > > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > > That's not a real reason. If its your project that someone is doing
> > > bad in, this is a situation which can be *clearly* specified in a
> > > projects policy and coding standards and can be *trivially* tested for
> > > with simple static analysis in nearly all cases. The problem is the
> > > person and not the code then. There's *countless* other ways that
> > > person can do bad if you're allowing them to commit blindly anything
> > > into your project.
> >
> > Aha! I see this attitude quite often among C/C++ people, regarding
> > buffer overflows and uninitialized pointer dereferences: someone will
> > say "C and C++ are unsafe languages because they allow you to overrun
> > buffers", then a C/C++ zealot will respond "Hire some good
> > programmers".
> >
> > SAME ATTITUDE.
>
> I couldn't agree more.
>
> As I said before, as an aeronautical engineer I don't know if enforced
> access restriction can be added to Python without compromising or
> unduly complicating the language. Maybe it can't. If that's the case,
> then people should make that argument. But just saying that enforced
> access restriction is useless in general is nonsense. Are we supposed
> to believe that the designers of C++, Java, Ada, and Scala are all
> idiots?
>
> Several participants here keep repeating that the leading-underscore
> convention is perfectly adequate. Aside from the aesthetic problem of
> littering code with leading underscores, let me try to explain the
> problem with leading underscores.
>
> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.


1. This would be a great spot to use a property. Problem solved.
2. Unit tests. Lots of unit tests.
3. Pylint will check for uninitialized fields. It won't stop you from
running the code obviously, but it will notify you if you forgot to change
something.
4. Find/Replace. Takes the effort out of looking for the places to change
the name.


[long argument for private keyword]

> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rhodri at wildebst.demon.co.uk  Mon Feb  2 18:59:47 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 02 Feb 2009 23:59:47 -0000
Subject: Question about wx folder browser widget
In-Reply-To: <gm5ng0$68l$1@ger.gmane.org>
References: <2d570f6a-4e97-4ab0-8fd2-eb5cddc5e363@z27g2000prd.googlegroups.com>
	<gm5ng0$68l$1@ger.gmane.org>
Message-ID: <op.uoq0xxcka8ncjz@gnudebst>

On Mon, 02 Feb 2009 02:58:07 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Sam Price wrote:
>> Is there any good wx widgets that provide the same feel as folder/file
>> browser.
>> I want to be notified when a user tries to drag and drop a file/folder
>> on the widget, and then copy that file/folder to a new folder an do
>> operations on it.
>>
>> Wanted to check first to see if something exists, and not reinvent the
>> wheel.
>>
> There's TreeCtrl, and CustomTreeCtrl. I don't know whether they can be
> used with drag and drop,

Yes they can, at least after a fashion.  See
http://wiki.wxpython.org/TreeControls

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Mon Feb  2 19:13:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 00:13:27 +0000
Subject: function scope
In-Reply-To: <49878466.9010503@gmail.com>
References: <49878466.9010503@gmail.com>
Message-ID: <49878C27.6010204@mrabarnett.plus.com>

Baris Demir wrote:
 > Hi everybody,
 >
 > I am quite new to python and using it for my thesis.  Luckily I found
 > out some kind of behavior surprising to me and so unwanted in my code. I
 > could not find any explanation, so solution for the code.
 > It is simply like this:
 >
 > /*li = another_module.global_variable
 > f=simpleCut(li)
 >
 > def simpleCut(d=dict()):
 >       temp=d
 >       for i in temp.keys():
 >           if    (temp[i] == .......) :
 >              temp[i]=new_value
 > return temp
 > */
 > here /*simpleCut(d=dict())*/ is a function that changes the value of the
 > key in the d if it satisfies conditions and returns the new dictionary.
 > what i do not understand is, when i checked the original dictionary
 > /*li,*/ i also found out that, the value of that key(operated in the if
 > statement) had also been changed. so, simply, the simpleCut function
 > also changes the variables of its own argument, even there is a 'temp'
 > variable. That is a scandal for my code:)
 >
 > please tell me, if this is not possible and i am missing another thing
 > in my code, or if this kind of behavior is possible, what is the
 > philosophy of it, and how can i change it???
 >
It's called "Reference Semantics".

"d" refers to a dict. When you say "temp=d" it makes "temp" also refer
to that dict; it doesn't copy the dict. If you want a copy when you have
to do so explicitly with "temp=d.copy()".

When you pass "li" into simpleCut() you're not making a copy either!


From apt.shansen at gmail.com  Mon Feb  2 19:15:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 16:15:45 -0800
Subject: function scope
In-Reply-To: <49878466.9010503@gmail.com>
References: <49878466.9010503@gmail.com>
Message-ID: <7a9c25c20902021615q77ca48dbtc165f65ac5f69664@mail.gmail.com>

On Mon, Feb 2, 2009 at 3:40 PM, Baris Demir <demirbaris at gmail.com> wrote:

> Hi everybody,
>
> I am quite new to python and using it for my thesis.  Luckily I found out
> some kind of behavior surprising to me and so unwanted in my code. I could
> not find any explanation, so solution for the code.
> It is simply like this:
>
> /*li = another_module.global_variable
> f=simpleCut(li)
>
> def simpleCut(d=dict()):
>      temp=d
>      for i in temp.keys():
>          if    (temp[i] == .......) :
>             temp[i]=new_value
> return temp
> */
> here /*simpleCut(d=dict())*/ is a function that changes the value of the
> key in the d if it satisfies conditions and returns the new dictionary.
> what i do not understand is, when i checked the original dictionary /*li,*/
> i also found out that, the value of that key(operated in the if statement)
> had also been changed. so, simply, the simpleCut function also changes the
> variables of its own argument, even there is a 'temp' variable. That is a
> scandal for my code:)


In Python, assignment statements simply bind an existing object to a name:
and when you call a function and pass that name in you're not passing the
name but the object itself-- which will now be bound to a new name.

So, if you have:

  li = {"hello": 5}

A dictionary is created, and is bound to the name "li".

If you then call:

   f=simpleCut(li)

The dictionary, previously created, will be bound to a new name within
simpleCut, that of "d".

Within simpleCut, you do:
    temp = d

That's simply binding the same dictionary to a new name. Its also the same
dictionary which is known as "li" somewhere else.

You then later do:
    return temp

That's returning the same dictionary-- as its returning from the function
the object currently bound to the name 'temp'.

That dictionary will end up being assigned to "f" from earlier.

In all of this you have one single dictionary, known by many names. You have
to take care when passing around mutable objects for this reason (and
there's another gotcha you're very near to by assigning a default value to a
mutable object: that default dict() will be the exact same default dict
every time you call the simpleCut() function with no arguments, instead of
it being a new dictionary everytime).

If you want to duplicate a dictionary, you import the copy module and call
copy.copy(d) (or copy.deepcopy(d) depending on the contents). You can also
pass the old dict to the dict() object to get a copy. I -believe- that's a
shallow copy. E.g, return dict(temp) will make a shallow copy.

--S
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From apt.shansen at gmail.com  Mon Feb  2 19:17:50 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 16:17:50 -0800
Subject: function scope
In-Reply-To: <49878C27.6010204@mrabarnett.plus.com>
References: <49878466.9010503@gmail.com> <49878C27.6010204@mrabarnett.plus.com>
Message-ID: <7a9c25c20902021617p270f563dy71b606301624ddd8@mail.gmail.com>

> If you want a copy when you have
> to do so explicitly with "temp=d.copy()".


Or that! I forgot about that method. :)

Curiously, in 160k lines of code, I haven't explicitly copied a dictionary
once. I find that odd.

--S
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From digitig at gmail.com  Mon Feb  2 19:28:01 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 3 Feb 2009 00:28:01 +0000
Subject: is python Object oriented??
In-Reply-To: <da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902021628u4be2350u22d6d637ee0cae1a@mail.gmail.com>

2009/2/2 Russ P. <Russ.Paielli at gmail.com>:
> On Feb 2, 2:46 pm, Tim Rowe <digi... at gmail.com> wrote:

>> No, we're supposed to believe that the designers of C++, Java, Ada,
>> and Scala are all designers of languages that are not Python. If all
>> languages had the same philosophy what would be the point of different
>> languages? Is it worth mentioning (again) that Python is not Java?
>>
>> --
>> Tim Rowe
>
> I am not sure why people keep "mentioning" that "Python is not Java."

Because Java is the language that folks most offen insist Python become like.

> As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
> either. All of those languages have enforced access restriction. Why
> only mention Java?

You might notice that I also mentioned C++, Ada and Scala.

> their wishes. If that's the case, you have my sympathies, but let's
> not pretend that Java is the only popular OO language with enforced
> access restrictions.

You might notice (again) that I also mentioned C++, Ada and Scala.

-- 
Tim Rowe


From rhodri at wildebst.demon.co.uk  Mon Feb  2 19:35:28 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 00:35:28 -0000
Subject: is python Object oriented??
In-Reply-To: <005201c98549$d3eb74a0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
Message-ID: <op.uoq2lefha8ncjz@gnudebst>

On Mon, 02 Feb 2009 13:54:08 -0000, Hendrik van Rooyen  
<mail at microcorp.co.za> wrote:

> <r...ray at bi...nce.com> wrote:
>> PS: More accurately, Python _embodies_ a philosophy, and to advocate
>> changes that go against that philosophy is to advocate changing
>> Python into something that would no longer be Python.  You can do
>> that, but you aren't likely to get the community to follow you.
>
> *sits on his hands to try to avoid the tangent, with the gaping hole of  
> religion
> looming beneath the spiderweb of philosophy, and the language spec  
> gathering
> dust in the corner, forgotten and forlorn*

This really, really, *really* isn't a tangent.  It's the heart of
the matter.  You are advocating a change that doesn't fit with
Python's "consenting adults" approach to programming.  It's trivial
to enforce hiding using static checking tools if you really feel the
need to not trust yourself; it's much harder (though by no means
impossible) to break language-enforced hiding when (not if) an
interface turns out to be inadequate.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From mrmakent at cox.net  Mon Feb  2 19:37:07 2009
From: mrmakent at cox.net (Mike Kent)
Date: Mon, 2 Feb 2009 16:37:07 -0800 (PST)
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
Message-ID: <cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>

On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:

> def simpleCut(d=dict()):
> ? ? ? ?temp=d
> ? ? ? ?for i in temp.keys():
> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
> ? ? ? ? ? ? ? temp[i]=new_value
> return temp

You have been bitten by the shared default parameter noobie trap:
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects


From denis.kasak at gmail.com  Mon Feb  2 19:50:34 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Tue, 3 Feb 2009 01:50:34 +0100
Subject: Reading text file with wierd file extension?
In-Reply-To: <c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
Message-ID: <39e19a010902021650v2a03a293le1e9b67fabd3fac7@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:43 PM, Lionel <lionel.keene at gmail.com> wrote:

<snip>

> >>> ResourcefilePath
> 'C:\\C8Example1.slc.rsc'

<snip>

> C:\C8Example1.slc.src

The extension you used in the interactive shell differs from the one
you used in the class code (i.e. "rsc" vs "src").

-- 
Denis Kasak


From bignose+hates-spam at benfinney.id.au  Mon Feb  2 20:00:18 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 03 Feb 2009 12:00:18 +1100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
Message-ID: <87y6woz659.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <874ozd3cr3.fsf at benfinney.id.au>,
> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >aahz at pythoncraft.com (Aahz) writes:
> >>
> >> Just to register a contrary opinion: I *hate* syntax highlighting
> >
> >On what basis?
> 
> It makes my eyes bleed

Okay. I'll tick the ?irrational objection? box and move on, then.

-- 
 \     Q: ?I've heard that Linux causes cancer...? Torvalds: ?That's a |
  `\         filthy lie. Besides, it was only in rats and has not been |
_o__)                           reproduced in humans.? ?Linus Torvalds |
Ben Finney


From lionel.keene at gmail.com  Mon Feb  2 20:01:53 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 17:01:53 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<mailman.8662.1233622236.3487.python-list@python.org>
Message-ID: <1f19d002-5a2e-45ab-9401-caf9ac967fea@g3g2000pre.googlegroups.com>

On Feb 2, 4:50?pm, Denis Kasak <denis.ka... at gmail.com> wrote:
> On Mon, Feb 2, 2009 at 10:43 PM, Lionel <lionel.ke... at gmail.com> wrote:
>
> <snip>
>
> > >>> ResourcefilePath
> > 'C:\\C8Example1.slc.rsc'
>
> <snip>
>
> > C:\C8Example1.slc.src
>
> The extension you used in the interactive shell differs from the one
> you used in the class code (i.e. "rsc" vs "src").
>
> --
> Denis Kasak

Yes, I see the problem now. Thank you everyone!

-L


From psteiger at dcc.ufba.br  Mon Feb  2 20:16:50 2009
From: psteiger at dcc.ufba.br (Patrick Steiger)
Date: Mon, 2 Feb 2009 22:16:50 -0300
Subject: what IDE is the best to write python?
In-Reply-To: <6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<gm7018$j39$1@panix3.panix.com>
	<6a2ccd190902020736l3ddb1332ued49bc528bc87121@mail.gmail.com>
Message-ID: <909ef3300902021716s2b4d2177o9954e349abd82402@mail.gmail.com>

2009/2/2 Joe Riopel <goon12 at gmail.com>

> I typically use vim/vi, because it's usually already installed on the
> OS's I work with and vim for Windows works the same. Also, using the
> same editor across these different OS's, I don't have to worry too
> much soft/hard tabs.


 You shouldn't even think about hard tabs, and you should default all your
editors to soft tabs.


-- 
"I May Be the Walrus."
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From gagsl-py2 at yahoo.com.ar  Mon Feb  2 20:17:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 02 Feb 2009 23:17:19 -0200
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gm70fg$l49$1@ger.gmane.org>
	<mailman.8607.1233587896.3487.python-list@python.org>
	<49871c5b$0$4087$ba4acef3@news.orange.fr>
Message-ID: <op.uoq4i5kpx6zn5v@gabriel2.softlabbsas.com.ar>

En Mon, 02 Feb 2009 14:21:29 -0200, m.banaouas  
<banaouas.medialog at wanadoo.fr> escribi?:

> My python version is 2.4.4
>
> def SubElement(parent, tag, attrib={}, **extra):
>
> Can you tell me how does "parent" issue could be solved by SubElement ?

Simply because you *have* to pass a parent to the function...

> I'm looking for how to determine element parent just by asking element  
> it self.

There isn't a way -- and there are good reasons. One is memory management  
(it would create reference cycles, and they aren't efficiently removed).  
Another one is that it prevents an element to be shared between containers.

> My goal is to clone an element and attach it to a specified parent or to  
> parant of original element to clone.

Then pass the desired parent as the "parent" argument.

En Mon, 02 Feb 2009 13:52:59 -0200, Gerard Flanagan <grflanagan at gmail.com>
escribi?:

> Not sure what SubElement gains you, in the context of the above function?

Just because Element and SubElement are documented as the recommended way  
to create Element instances. Also, I was under the impression that  
makeelement did not make a copy of its "attrib" argument, so it would end  
being shared by other instances too -- but it isn't the case actually.

-- 
Gabriel Genellina



From mdw at distorted.org.uk  Mon Feb  2 20:19:21 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 01:19:21 +0000
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
	<7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>
Message-ID: <87wsc8mi5i.fsf.mdw@metalzone.distorted.org.uk>

John Machin <sjmachin at lexicon.net> writes:

> 3 can be represented in 2 bits and at the same time -3 can be
> represented in 2 bits?? But 2 bits can support only 2 ** 2 == 4
> different possibilities, and -3 .. 3 is 7 different integers.

Yeah, I made some arbitrary choices about what to do with non-positive
inputs.  If you prefer other answers, use 'em.  My ones work well with
signed-magnitude representations where the sign is stored separately.

>> ? ## Find upper bound of the form 2^(2^n) >= x.
>
> Possibly you mean 2 ** ( 2 ** n) >= x

I write maths in comments, not Python.  Feel lucky I didn't write it in
LaTeX.

-- [mdw]


From jervisau at gmail.com  Mon Feb  2 20:35:32 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Tue, 3 Feb 2009 12:35:32 +1100
Subject: what IDE is the best to write python?
In-Reply-To: <20090202034654.GD30237@turki.gavron.org>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<20090202034654.GD30237@turki.gavron.org>
Message-ID: <8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>

On Mon, Feb 2, 2009 at 2:46 PM, Chris Jones <cjns1989 at gmail.com> wrote:
> On Sun, Feb 01, 2009 at 07:26:24PM EST, Ben Finney wrote:
>> aahz at pythoncraft.com (Aahz) writes:
>>
>> > Just to register a contrary opinion: I *hate* syntax highlighting
>>
>> On what basis?
>
> Real men hate syntax highlighting.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

real programmers use ed.

http://www.gnu.org/fun/jokes/ed.msg.html


From rhodri at wildebst.demon.co.uk  Mon Feb  2 20:40:37 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 01:40:37 -0000
Subject: Reading text file with wierd file extension?
In-Reply-To: <b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
Message-ID: <op.uoq5lze6a8ncjz@gnudebst>

[Quoting restored for reduced

On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.keene at gmail.com> wrote:

> On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>
>> >> This is written very slowly, so you can read it better:
>>
>> > Please post without sarcasm.

On Usenet?  You'll be wanting single unequivocal answers next!

Seriously though, you had been asked several times for the traceback,
so that we could stop guessing and tell you for sure what was going
on, and you hadn't provided it.  Diez's mild sarcasm was not uncalled-
for.  The fact that you didn't have a traceback partially excuses you,
but it would have helped if you'd said so.

>>
>> > This is the output from my Python shell:
>>
>> > >>> DatafilePath = "C:\\C8Example1.slc"
>> > >>> ResourcefilePath = DatafilePath + ".rsc"
>> > >>> DatafileFH = open(DatafilePath)
>> > >>> ResourceFh = open(ResourcefilePath)
>> > >>> DatafilePath
>>
>> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>>
>> > 'C:\\C8Example1.slc.rsc'
>>
>> > It seems to run without trouble. However, here is the offending code
>> > in my class (followed by console output):
>>
>> > class C8DataType:
>>
>> > ? ? def __init__(self, DataFilepath):
>>
>> > ? ? ? ? try:
>> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>>
>> > ? ? ? ? except IOError, message:
>> > ? ? ? ? ? ? # Error opening file.
>> > ? ? ? ? ? ? print(message)
>> > ? ? ? ? ? ? return None

You're catching the IOError, presumably so that you can fail
gracefully elsewhere.  This may not be a particularly good
idea, and in any case it stops the exception reaching the
console where it would cause the traceback to be displayed.
More on this later.

>> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"

As other people have pointed out, you've got a typo here.

>> > ? ? ? ? print(DataFilepath)
>> > ? ? ? ? print(ResourceFilepath)
>>
>> > ? ? ? ? # Try to open resource file, catch exception:
>> > ? ? ? ? try:
>> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>>
>> > ? ? ? ? except IOError, message:
>> > ? ? ? ? ? ? # Error opening file.
>> > ? ? ? ? ? ? print(message)
>> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
>> > ? ? ? ? ? ? DataFH.close()
>> > ? ? ? ? ? ? return None

[Huge amounts of text trimmed]

Fair enough, you're catching the IOError so that you can
ensure that DataFH is closed.  Unfortunately this concealed
the traceback information, which would have made it more
obvious to you what people were talking about.  Given that
this has rather stuffed your C8DataType instance, you
might want to think about re-raising the exception after
you've closed DataFH and letting the outer layers deal
with it in a more appropriate fashion.

Incidentally, this code isn't going to do anything useful
for you anyway even after you've fixed the typo.  DataFH
and ResourceFH are both local variables to __init__ and
will be tossed away when it finishes executing.  If you
want to use them later, make them self.data_fh and
self.resource_fh respectively.

(PEP 8 recommends that you use lower_case_with_underscores
for variable or attribute names, and leave MixedCase for
class names.)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Mon Feb  2 20:47:28 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 01:47:28 -0000
Subject: key capture
In-Reply-To: <4986CEC1.6060209@wildenhain.de>
References: <72218f020902012244g75593286x83f3157c0379a8e0@mail.gmail.com>
	<4986CEC1.6060209@wildenhain.de>
Message-ID: <op.uoq5s0zwa8ncjz@gnudebst>

On Mon, 02 Feb 2009 10:45:21 -0000, Tino Wildenhain <tino at wildenhain.de>
wrote:

> Hi,
>
> swamynathan wrote:
>> hello,
>> im making a virtual piano in python where on key stroke a wav is played
>> from a location
>> now to implement  a fully functional piano i need to have multiple key
>> stroke captures  ie if 2 or 3 keys pressed then the function which
>> playes the wav is called with 3 parameters
>
>
>> how to implement this or any other suggestion(i was asked to try multi
>> threading which dint seem optimal)
>
> Are you trying to do this with a computer keyboard or with an
> attached midi or usb music keybord? If the former, you are probably
> w/o luck because afaik there is no way to track the event
> of having random keys pressed the same time.

Yes there is.  You need to use one of the GUIs (Tkinter, wxPython,
PyGame, etc), all of which will give you Key Down/Key Up events.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gotbyrd at gmail.com  Mon Feb  2 21:02:46 2009
From: gotbyrd at gmail.com (gotbyrd)
Date: Mon, 2 Feb 2009 18:02:46 -0800 (PST)
Subject: Searching a file for multiple strings
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<mailman.8479.1233431134.3487.python-list@python.org>
Message-ID: <a8547f73-c187-4df4-badb-1e32528133d7@r34g2000vbp.googlegroups.com>

On Jan 31, 2:45?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > I'm fairly new with python and am trying to build a fairly simple
> > search script. ?Ultimately, I'm wanting to search a directory of files
> > for multiple user inputted keywords. ?I've already written a script
> > that can search for a single string through multiple files, now I just
> > need to adapt it to multiple strings.
>
> > I found a bit of code that's a good start:
>
> > import re
> > test = open('something.txt', 'r').read()
>
> > list = ['a', 'b', 'c']
>
> > foundit = re.compile('|'.join(re.escape(target) for target in list))
> > if foundit.findall(test):
> > ? ? print 'yes!'
>
> > The only trouble with this is it returns yes! if it finds any of the
> > search items, and I only want a return when it finds all of them. ?Is
> > there a bit of code that's similar that I can use?
>
> [insert standard admonition about using "list" as a variable
> name, masking the built-in "list"]
> Unless there's a reason to use regular expressions, you could
> simply use
>
> ? ?test = open("something.txt").read()
> ? ?items = ['a', 'b', 'c']
> ? ?if all(s in test for s in items):
> ? ? ?print "Yes!"
> ? ?else:
> ? ? ?print "Sorry, bub"
>
> This presumes python2.5 in which the "all()" function was added.
> ? Otherwise in pre-2.5, you could do
>
> ? ?for s in items:
> ? ? ?if s not in test:
> ? ? ? ?print "Sorry, bub"
> ? ? ? ?break
> ? ?else:
> ? ? ?print "Yeparoo"
>
> (note that the "else" goes with the "for", not the "if")
>
> -tkc

Thanks, Tim.  What you suggested worked perfectly!

Jason


From gotbyrd at gmail.com  Mon Feb  2 21:05:37 2009
From: gotbyrd at gmail.com (gotbyrd)
Date: Mon, 2 Feb 2009 18:05:37 -0800 (PST)
Subject: Searching a file for multiple strings (PS)
References: <7b0df317-c3cb-4013-9b68-42d0ee9869df@f24g2000vbf.googlegroups.com>
	<4984AA57.3050106@tim.thechases.com>
	<4984ADDB.2070509@tim.thechases.com> 
	<mailman.8503.1233463160.3487.python-list@python.org>
Message-ID: <26622f01-2418-442d-91c2-0f026d571edd@35g2000pry.googlegroups.com>

On Jan 31, 11:39?pm, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Sat, Jan 31, 2009 at 3:00 PM, Tim Chase
>
> <python.l... at tim.thechases.com> wrote:
> >>> I'm fairly new with python and am trying to build a fairly simple
> >>> search script. ?Ultimately, I'm wanting to search a directory of files
> >>> for multiple user inputted keywords. ?I've already written a script
> >>> that can search for a single string through multiple files, now I just
> >>> need to adapt it to multiple strings.
>
> Not to discourage the use of Python, but it seems that fgrep with the
> -f flag already does exactly what you want. If you're on Windows, you
> can get the Windows version of fgrep here:http://unxutils.sourceforge.net/
>
> Shawn

Shawn,

Thanks for your suggestion, but the office I work in has python 2.4 on
its workstations and we're prohibited from installing outside
software.  Learning to use python was quicker than getting the IT
staff to approve adding new software :)

Jason



From lionel.keene at gmail.com  Mon Feb  2 21:08:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 2 Feb 2009 18:08:49 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
Message-ID: <22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>

On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> [Quoting restored for reduced
>
> On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> >> >> This is written very slowly, so you can read it better:
>
> >> > Please post without sarcasm.
>
> On Usenet? ?You'll be wanting single unequivocal answers next!
>
> Seriously though, you had been asked several times for the traceback,
> so that we could stop guessing and tell you for sure what was going
> on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> for. ?The fact that you didn't have a traceback partially excuses you,
> but it would have helped if you'd said so.
>
>
>
>
>
>
>
> >> > This is the output from my Python shell:
>
> >> > >>> DatafilePath = "C:\\C8Example1.slc"
> >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> >> > >>> DatafileFH = open(DatafilePath)
> >> > >>> ResourceFh = open(ResourcefilePath)
> >> > >>> DatafilePath
>
> >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> >> > 'C:\\C8Example1.slc.rsc'
>
> >> > It seems to run without trouble. However, here is the offending code
> >> > in my class (followed by console output):
>
> >> > class C8DataType:
>
> >> > ? ? def __init__(self, DataFilepath):
>
> >> > ? ? ? ? try:
> >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> >> > ? ? ? ? except IOError, message:
> >> > ? ? ? ? ? ? # Error opening file.
> >> > ? ? ? ? ? ? print(message)
> >> > ? ? ? ? ? ? return None
>
> You're catching the IOError, presumably so that you can fail
> gracefully elsewhere. ?This may not be a particularly good
> idea, and in any case it stops the exception reaching the
> console where it would cause the traceback to be displayed.
> More on this later.
>
> >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> As other people have pointed out, you've got a typo here.
>
> >> > ? ? ? ? print(DataFilepath)
> >> > ? ? ? ? print(ResourceFilepath)
>
> >> > ? ? ? ? # Try to open resource file, catch exception:
> >> > ? ? ? ? try:
> >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> >> > ? ? ? ? except IOError, message:
> >> > ? ? ? ? ? ? # Error opening file.
> >> > ? ? ? ? ? ? print(message)
> >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> >> > ? ? ? ? ? ? DataFH.close()
> >> > ? ? ? ? ? ? return None
>
> [Huge amounts of text trimmed]
>
> Fair enough, you're catching the IOError so that you can
> ensure that DataFH is closed. ?Unfortunately this concealed
> the traceback information, which would have made it more
> obvious to you what people were talking about. ?Given that
> this has rather stuffed your C8DataType instance, you
> might want to think about re-raising the exception after
> you've closed DataFH and letting the outer layers deal
> with it in a more appropriate fashion.
>
> Incidentally, this code isn't going to do anything useful
> for you anyway even after you've fixed the typo. ?DataFH
> and ResourceFH are both local variables to __init__ and
> will be tossed away when it finishes executing. ?If you
> want to use them later, make them self.data_fh and
> self.resource_fh respectively.
>
> (PEP 8 recommends that you use lower_case_with_underscores
> for variable or attribute names, and leave MixedCase for
> class names.)
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> - Show quoted text -

Very good comments. I'll be implementing some of your suggestions, to
be sure. Thanks Rhodri.


From mdw at distorted.org.uk  Mon Feb  2 21:14:49 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 02:14:49 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <87skmwmfl2.fsf.mdw@metalzone.distorted.org.uk>

"Russ P." <Russ.Paielli at gmail.com> writes:

> I am not sure why people keep "mentioning" that "Python is not Java."
> As a slogan, it is rather misleading. Python is not C++, Ada, or Scala
> either. All of those languages have enforced access restriction. Why
> only mention Java?

Because Java is a well-known member of a family of object-oriented
languages (or at least languages supporting object-oriented
programming).  `Python is not Java' is somewhat of a slogan, intended to
convey the message that Python, quite intentionally, does not behave in
the same way as other languages you may be familiar with.

Smalltalk's visibility features are very different from C++ and Java: a
method can mess with its own object's (i.e., the recipient of the
message which caused the method to be invoked) instance variables but no
others -- a restriction enforced syntactically, since there is simply no
way of referring to a different instance's variables.  There is no
restriction whatever on sending messages to other objects.  Self
abandons the concept of instance variable (and of class, for that
matter), and access controls with it.

The Common Lisp Object System provides no access control features
(though one could probably implement some using the MOP, were one
sufficiently motivated); however, CL's package system is better placed
for this job anyway.  Other object systems for Lisp-family languages
tend to be similar.  The Lisp Machine's Flavors -- the first object
system with multiple inheritance -- relied on the package system for
access control; CLOS-like systems for Scheme, which lacks packages, tend
not to bother at all.  (The package system controls the mapping from
tokens read from, say, files to symbols; packages can export some of
their symbols, so you can refer to, say, MDW:FOO if package MDW exports
symbol FOO, or you can `use' package MDW in your own package to make FOO
refer to MDW:FOO.  The package system tries to keep you honest rather
than acting as an enforcement mechanism: even if MDW doesn't export BAR,
you can still talk about MDW::BAR -- note the double-colon -- as much as
you like.  Working at the name-to-symbol level allows the package system
to operate uniformly on all the various namespaces in Lisp.)

Perl's object system provides no access controls.  Ruby does, following
Simula, though it uses C++-ish `private' for Simula's `hidden'.

> If that's the case, you have my sympathies, but let's not pretend that
> Java is the only popular OO language with enforced access
> restrictions.

No, but let's not pretend either that such features are essential to
object orientation, or that they are even typical of object systems
outside of a particular (admittedly popular) subfamily.

-- [mdw]


From Russ.Paielli at gmail.com  Mon Feb  2 21:16:01 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 18:16:01 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
Message-ID: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>

On Feb 2, 4:35 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:

> This really, really, *really* isn't a tangent.  It's the heart of
> the matter.  You are advocating a change that doesn't fit with
> Python's "consenting adults" approach to programming.  It's trivial
> to enforce hiding using static checking tools if you really feel the
> need to not trust yourself; it's much harder (though by no means
> impossible) to break language-enforced hiding when (not if) an
> interface turns out to be inadequate.

Here we go again. If you have access to the source code (as you nearly
always do with Python code), then "breaking the language-enforced data
hiding" is a trivial matter of deleting the word "private" (or
equivalent).

I know ... changing one word constitutes a "fork." Yeah, right. You
can't be bothered to change one word, but the library developer should
be required to litter his code with leading underscores everywhere,
and large development teams should depend on labor intensive code
reviews for checks that could be automated by the language. (And,
please ... I am not suggesting that enforced access restrictions would
render code reviews unnecessary, but it could certainly simplify
them.)


From ianand0204 at gmail.com  Mon Feb  2 21:25:37 2009
From: ianand0204 at gmail.com (flagg)
Date: Mon, 2 Feb 2009 18:25:37 -0800 (PST)
Subject: Code critique xmlrpclib
Message-ID: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>

This xmlrpc server is designed to parse dns zone files and then
perform various actions on said files. \
It uses dnspython, and xmlrpclib
 I'd like to know what some of the more experienced python users
think. Where I could improve code, make it more efficient, whatever.
All suggestions are welcome.  This is my first functional python
program,  and I have tons of questions to go along with whatever
suggestions.   How could I do sanity checking; right now nothing
checks the input to these functions, error-handling in this program is
almost non-existant how do you integrate decent error handling into a
piece of software......ill shut up now.

Thanks


import dns.zone
from time import localtime, strftime, time
import os, sys
from dns.rdataclass import *
from dns.rdatatype import *
from string import Template
import xmlrpclib
from SimpleXMLRPCServer import SimpleXMLRPCServer
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler


zoneDir = "/dns"

def openZoneFile(zoneFile):
    """
    Opens a zone file.  Then reads in zone file to dnspython zone
object.
    """
    global zone
    global host
    global domain
    domain = ".".join(zoneFile.split('.')[1:])
    host = ".".join(zoneFile.split('.')[:1])

    try:
            zone = dns.zone.from_file(zoneDir + domain + '.zone',
domain)
    except dns.exception, e:
            print e.__class__, e

class DNSFunctions:

     # Not exposed to xml-rpc calls, used internally only.
    def _writeToZoneFile(self, record):
        """
        Checks if zone file exists, if it does it write values to zone
file
        """

        for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
            new_serial = int(strftime('%Y%m%d00', localtime(time())))
            if new_serial <= rdata.serial:
                new_serial = rdata.serial + 1
            rdata.serial = new_serial

        if os.path.exists(zoneDir + str(zone.origin) + "zone"):
            f = open(zoneDir + str(zone.origin) + "zone", "w")
            zone.to_file(f)
            f.close()
        else:
            print "Zone: " + zone.origin + " does not exist, please
add first"

    def showRecord(self, record):
        """
        Shows a record for a given zone. Prints out
        TTL, IN, Record Type, IP
        """

        openZoneFile(record)

        try:
            rdataset = zone.get_node(host)
            for rdata in rdataset:
                return str(rdata)
        except:
            raise Exception("Record not found")


    def changeRecord(self, record, type, target):
        """
        Changes a dns entry.
        @param record: which record to chance
        @param type:  what type of record, A, MX, NS, CNAME
        @target: if CNAME target points to HOSTNAME, if A record
points to IP
        """
        openZoneFile(record)
        try:
            rdataset = zone.find_rdataset(host, rdtype=type)
        except:
            raise Exception("You must enter a valid record and type.
See --usage for examples")

        for rdata in rdataset:
            if rdata.rdtype == CNAME:
                rdata.target = dns.name.Name((target,))
            elif rdata.rdtype == A:
                rdata.address = target
            else:
               assert False

        self._writeToZoneFile(host)


    def deleteRecord(self, record):
        """
        Delete Entry from zone file
        """
        openZoneFile(record)
        zone.delete_node(host)
        self._writeToZoneFile(record)

    def addRecord(self, record, type, target):
        """
        Adds a new record to zone file
        """
        openZoneFile(record)

        rdataset = zone.find_rdataset(host, rdtype=type, create=True)
        if rdataset.rdtype == A:
            rdata = dns.rdtypes.IN.A.A(IN, A, address = target)
            rdataset.add(rdata, ttl=300)
        elif rdataset.rdtype == CNAME:
            rdata = dns.rdtypes.ANY.CNAME.CNAME(IN, CNAME,
dns.name.Name((target,)))
            rdataset.add(rdata, ttl=300)
        else:
            assert False

        self._writeToZoneFile(host)


    def addZoneFile(self, file):
        """
        Function to create a new empty zone file, if none exists.  If
exists
        function will terminate.
        """
        newZoneSerial =  strftime("%Y%m%d00", localtime())
        zoneTemplate = Template('''$$TTL    ${ttltime}
    $$ORIGIN ${domain}.
    @       5M      IN      SOA     nsrepo1.foobar.priv.
dnsadmin.foobar.priv. (
                            ; did you update reverse?!
                            ${serial}  ; Serial CCYYMMDDxx where xx is
todays edit
                            1H
                            10M
                            1D
                            60M
    )''')

        if not os.path.exists(zoneDir + file + ".zone"):
            f = open(zoneDir + file + ".zone", "w")
            f.write(zoneTemplate.substitute({'ttltime':'300',
'domain': file, 'serial': newZoneSerial}))
            f.close()
        else:
            print "Zone: " + file + " already exists"



class RequestHandler(SimpleXMLRPCRequestHandler):
  #  rpc_paths = ('/RPC2',),
    pass

server = SimpleXMLRPCServer(("localhost", 8080), requestHandler =
RequestHandler, allow_none=True)

print "Listening on port 8080..."

server.register_introspection_functions()
server.register_instance(DNSFunctions())
server.register_multicall_functions()
server.serve_forever()


### Client Script ###
## I will probably use a mix of multicalls and singlecalls<?> for
client activity.  Muticalls will primarily be used for showing a
record, applying a change, then showing the same record again to
verify changes went through.

import xmlrpclib

proxy = xmlrpclib.ServerProxy('http://localhost:8080')
multicall = xmlrpclib.MultiCall(proxy)



print proxy.showRecord('host11.lab0.foobar.priv')
print proxy.showRecord('host12.lab0.foobar.priv')

multicall.showRecord('host11.lab0.foobar.priv')
multicall.changeRecord('host11.lab0.foorbar.priv', 'A', '127.0.0.1')
multicall.showRecord('host11.lab0.foobar.priv')

print proxy.system.listMethods
result = multicall()

print result[1], result[2]



From raykyoto at gmail.com  Mon Feb  2 21:37:55 2009
From: raykyoto at gmail.com (Ray)
Date: Mon, 2 Feb 2009 18:37:55 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
Message-ID: <0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>


Hi all,


On Feb 3, 1:11?am, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 2, 11:51?pm, pyt... at bdurham.com wrote:
>
> > If the output is coming from a print command, couldn't the OP
> > temporarily redirect STDIO to a file to prevent the output from being
> > displayed?
>
> He could, but that'd be a kludge on top of a stuff-up. He should put
> the script-only statements inside
> ? ? if __name__ == '__main__':
> and send the result back to the original author, who may in fact
> appreciate being enlightened :-)
>
> Cheers,
> John


Thanks John and Malcolm!  In my case the first solution would not
work.  Sorry, that my simple "test" example was only a minimal one
which did not reflect the true problem.  The module that I do not want
to edit not only runs on the command line and does some processing,
but also expects arguments.  So, when reading it through importing, it
exits with an error (because no arguments were supplied).

I'll enclose the top-level commands with the if statement above...its
just a minor change, but it seems unavoidable.

Thanks again!

Ray



From john at john-a-harper.com  Mon Feb  2 21:59:29 2009
From: john at john-a-harper.com (John Harper)
Date: Tue, 03 Feb 2009 02:59:29 -0000
Subject: Cross platform compilation?
Message-ID: <gm8buh+ofl4@eGroups.com>

I am trying to build Python to use in an embedded system which uses a 
ppc_440 CPU. The only information I've found is something written by 
Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
seem to have successfully built Python itself, but building the 
extensions fails miserably with complaints about library format. It 
insists on referring to "i686" which is indeed the platform it is 
actually running on.

Before I try to reverse engineer completely setup.py, is there 
something obvious that needs to be done to get it to use the right tool 
chain?

More generally, it seems like this would be something that lots of 
people would want to do. I'm surprised there isn't support for it built 
into the distributed version of Python, without having to hack all the 
setup files...?

Thanks,

John



From grante at visi.com  Mon Feb  2 22:27:21 2009
From: grante at visi.com (Grant Edwards)
Date: Mon, 02 Feb 2009 21:27:21 -0600
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8649.1233614806.3487.python-list@python.org>
	<da021161-1658-45fb-a333-b67f59040ee9@i24g2000prf.googlegroups.com>
Message-ID: <D72dnTAvf9YEJBrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-02, Russ P. <Russ.Paielli at gmail.com> wrote:

> I am not sure why people keep "mentioning" that "Python is not
> Java." As a slogan, it is rather misleading.

Because other people keep insisting that it ought to be.

> Python is not C++, Ada, or Scala either. All of those
> languages have enforced access restriction. Why only mention
> Java?

It's often mentioned that Python is not C++ as well.

People who know Ada or Scala presumably have a varied enough
background that they find no need insist that all languages
must do things the same way as language X does.

-- 
Grant



From grante at visi.com  Mon Feb  2 22:30:01 2009
From: grante at visi.com (Grant Edwards)
Date: Mon, 02 Feb 2009 21:30:01 -0600
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com>
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com>
	<mailman.8666.1233625242.3487.python-list@python.org>
Message-ID: <D72dnTMvf9akJxrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-03, Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
> [Quoting restored for reduced
>
> On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.keene at gmail.com> wrote:
>
>> On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>>> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
>>> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>>
>>> >> This is written very slowly, so you can read it better:
>>>
>>> > Please post without sarcasm.
>
> On Usenet?  You'll be wanting single unequivocal answers next!

ROFL!

> Seriously though, you had been asked several times for the
> traceback, so that we could stop guessing and tell you for
> sure what was going on, and you hadn't provided it.  Diez's
> mild sarcasm was not uncalled- for.  The fact that you didn't
> have a traceback partially excuses you, but it would have
> helped if you'd said so.

The OP might be well served by a careful reading of 

  http://www.catb.org/~esr/faqs/smart-questions.html

-- 
Grant



From rhodri at wildebst.demon.co.uk  Mon Feb  2 22:48:58 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 03 Feb 2009 03:48:58 -0000
Subject: is python Object oriented??
In-Reply-To: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
Message-ID: <op.uorbjwzoa8ncjz@gnudebst>

On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> Here we go again. If you have access to the source code (as you nearly
> always do with Python code), then "breaking the language-enforced data
> hiding" is a trivial matter of deleting the word "private" (or
> equivalent).

If it's that trivial to defeat something that its proponents appear to
want to be close to an iron-clad guarantee, what on earth is the point
of using "private" in the first place?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From kyosohma at gmail.com  Mon Feb  2 22:57:24 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 2 Feb 2009 19:57:24 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
	<22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>
Message-ID: <3f280744-c393-4709-98d7-bf00366178c9@v39g2000pro.googlegroups.com>

On Feb 2, 8:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>
>
>
> > [Quoting restored for reduced
>
> > On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> > >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > >> >> This is written very slowly, so you can read it better:
>
> > >> > Please post without sarcasm.
>
> > On Usenet? ?You'll be wanting single unequivocal answers next!
>
> > Seriously though, you had been asked several times for the traceback,
> > so that we could stop guessing and tell you for sure what was going
> > on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> > for. ?The fact that you didn't have a traceback partially excuses you,
> > but it would have helped if you'd said so.
>
> > >> > This is the output from my Python shell:
>
> > >> > >>> DatafilePath = "C:\\C8Example1.slc"
> > >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > >> > >>> DatafileFH = open(DatafilePath)
> > >> > >>> ResourceFh = open(ResourcefilePath)
> > >> > >>> DatafilePath
>
> > >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > >> > 'C:\\C8Example1.slc.rsc'
>
> > >> > It seems to run without trouble. However, here is the offending code
> > >> > in my class (followed by console output):
>
> > >> > class C8DataType:
>
> > >> > ? ? def __init__(self, DataFilepath):
>
> > >> > ? ? ? ? try:
> > >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > >> > ? ? ? ? except IOError, message:
> > >> > ? ? ? ? ? ? # Error opening file.
> > >> > ? ? ? ? ? ? print(message)
> > >> > ? ? ? ? ? ? return None
>
> > You're catching the IOError, presumably so that you can fail
> > gracefully elsewhere. ?This may not be a particularly good
> > idea, and in any case it stops the exception reaching the
> > console where it would cause the traceback to be displayed.
> > More on this later.
>
> > >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > As other people have pointed out, you've got a typo here.
>
> > >> > ? ? ? ? print(DataFilepath)
> > >> > ? ? ? ? print(ResourceFilepath)
>
> > >> > ? ? ? ? # Try to open resource file, catch exception:
> > >> > ? ? ? ? try:
> > >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > >> > ? ? ? ? except IOError, message:
> > >> > ? ? ? ? ? ? # Error opening file.
> > >> > ? ? ? ? ? ? print(message)
> > >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > >> > ? ? ? ? ? ? DataFH.close()
> > >> > ? ? ? ? ? ? return None
>
> > [Huge amounts of text trimmed]
>
> > Fair enough, you're catching the IOError so that you can
> > ensure that DataFH is closed. ?Unfortunately this concealed
> > the traceback information, which would have made it more
> > obvious to you what people were talking about. ?Given that
> > this has rather stuffed your C8DataType instance, you
> > might want to think about re-raising the exception after
> > you've closed DataFH and letting the outer layers deal
> > with it in a more appropriate fashion.
>
> > Incidentally, this code isn't going to do anything useful
> > for you anyway even after you've fixed the typo. ?DataFH
> > and ResourceFH are both local variables to __init__ and
> > will be tossed away when it finishes executing. ?If you
> > want to use them later, make them self.data_fh and
> > self.resource_fh respectively.
>
> > (PEP 8 recommends that you use lower_case_with_underscores
> > for variable or attribute names, and leave MixedCase for
> > class names.)
>
> > --
> > Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> > - Show quoted text -
>
> Very good comments. I'll be implementing some of your suggestions, to
> be sure. Thanks Rhodri.

You could check to see if the file actually exists using os.path.exists
(). I've found that if I use that in combination with printing the
path variable, I sometimes discover that either my file doesn't exist
or that my path is slightly wrong and thus Python doesn't think my
file exists...

Mike


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  2 23:25:53 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Feb 2009 04:25:53 GMT
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
Message-ID: <pan.2009.02.03.04.25.53@REMOVE.THIS.cybersource.com.au>

On Mon, 02 Feb 2009 16:37:07 -0800, Mike Kent wrote:

> On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:
> 
>> def simpleCut(d=dict()):
>> ? ? ? ?temp=d
>> ? ? ? ?for i in temp.keys():
>> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
>> ? ? ? ? ? ? ? temp[i]=new_value
>> return temp
> 
> You have been bitten by the shared default parameter noobie trap:

No, he has tripped over the assignment-doesn't-make-copies feature. 
Ignore the default value, and consider passing in a dict:


def simpleCut(d=dict()):
? ? temp=d
    # ...

That doesn't make a temporary copy of d, it makes a new name that refers 
to the same dictionary as d. So if you do this:

li = {'x': 1}
f = simpleCut(li)

then

assert f is li

will pass, and he will be surprised and dismayed to discover that 
simpleCut() has side-effects.


Solution: make a copy of the input.


def simpleCut(d=dict()):
    temp = d.copy()
    for i in temp:  # don't need to call keys()
        if (temp[i] == ...):
            temp[i] = new_value
    return temp



-- 
Steven


From timr at probo.com  Mon Feb  2 23:27:03 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 03 Feb 2009 04:27:03 GMT
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com>
	<598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com>
Message-ID: <aqhfo4lndptd28f21f2lgoppap5mgcgpca@4ax.com>

vsoler <vicente.soler at gmail.com> wrote:
>
>I'm still interested in learning python techniques. Are there any
>other modules (standard or complementary) that I can use in my
>education?

Are you serious about this?  Are you not aware that virtually ALL of the
Python standard modules are written in Python, and are included in their
full, readable source form in every Python installation?  \Python25\lib in
Windows, /usr/lib/python25 in Linux.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From timr at probo.com  Mon Feb  2 23:29:01 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 03 Feb 2009 04:29:01 GMT
Subject: function scope
References: <mailman.8654.1233618041.3487.python-list@python.org>
	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
Message-ID: <0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>

Mike Kent <mrmakent at cox.net> wrote:
>
>On Feb 2, 6:40?pm, Baris Demir <demirba... at gmail.com> wrote:
>
>> def simpleCut(d=dict()):
>> ? ? ? ?temp=d
>> ? ? ? ?for i in temp.keys():
>> ? ? ? ? ? ?if ? ?(temp[i] == .......) :
>> ? ? ? ? ? ? ? temp[i]=new_value
>> return temp
>
>You have been bitten by the shared default parameter noobie trap:
>http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects

Actually, he hasn't.  His problem is more fundamental.

However, this is still a good thing for you to point out now and then.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From kyrie at uh.cu  Mon Feb  2 23:41:23 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 02 Feb 2009 23:41:23 -0500
Subject: is python Object oriented??
In-Reply-To: <2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
Message-ID: <1233636083.4987caf3011e2@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> I know ... changing one word constitutes a "fork." Yeah, right.

Yeah, right.

> You can't be bothered to change one word, but the library developer should
> be required to litter his code with leading underscores everywhere,

No, instead they will have to litter his code with "private" keywords.

(So now this is about laziness and not wanting to type "_"? The argument gets
weirder and weirder)

> and large development teams should depend on labor intensive code
> reviews for checks that could be automated by the language.

Or, by already existing third party tools that you insist on ignoring.

> (And, please ... I am not suggesting that enforced access restrictions 
> would render code reviews unnecessary, but it could certainly simplify
> them.)

Please, tell, how does it having the checks on the interpreter will simplify
them more than having the checks on an external tool?

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie





From aahz at pythoncraft.com  Tue Feb  3 00:09:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 21:09:58 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au>
Message-ID: <gm8jj6$hfq$1@panix3.panix.com>

In article <87y6woz659.fsf at benfinney.id.au>,
Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>aahz at pythoncraft.com (Aahz) writes:
>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>aahz at pythoncraft.com (Aahz) writes:
>>>>
>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>
>>>On what basis?
>> 
>> It makes my eyes bleed
>
>Okay. I'll tick the ???irrational objection??? box and move on, then.

You favor bleeding eyes?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From Russ.Paielli at gmail.com  Tue Feb  3 00:37:57 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 21:37:57 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
Message-ID: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>

On Feb 2, 7:48?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > Here we go again. If you have access to the source code (as you nearly
> > always do with Python code), then "breaking the language-enforced data
> > hiding" is a trivial matter of deleting the word "private" (or
> > equivalent).
>
> If it's that trivial to defeat something that its proponents appear to
> want to be close to an iron-clad guarantee, what on earth is the point
> of using "private" in the first place?
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

If a library developer releases the source code of a library, any user
can trivially "defeat" the access restrictions. But if a team of
developers is checking in code for a project, the leader(s) of the
project can insist that the access restrictions be respected to
simplify the management of interfaces. The larger the team, the more
useful that can be. That's why Java, C++, Ada, Scala, and other
languages have a "private" keyword.


From peter.anderson at internode.on.net  Tue Feb  3 00:40:00 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Tue, 03 Feb 2009 16:40:00 +1100
Subject: what IDE is the best to write python?
In-Reply-To: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
References: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
Message-ID: <4987D8B0.4030904@internode.on.net>

I have a "thing" about editors; a good editor is my tool of trade! I 
have tried many editors over the years mainly in the MS Windows, Linux 
and IBM mainframe environments. After all this I really like EditPlus 
(and the a slightly lesser extent Textpad). What both have in common is 
their "Clip Library" or "Clip Text" (I think its called in Textpad).

A Clip Library is a simple text file that appears in a side panel next 
to the main edit panel. Double click on a Clip Library element and it is 
automatically pasted into the edit panel at the current cursor position. 
The Clip Library content can also be pased around highlighted text in 
the edit panel.

Here is a simple of an EditPlus Clip Library for what I call a "short 
script":

#T=Short script
^# ^!.py
^# The purpose of this script is

def main():
{code here}

main()

#T=Next Clip Library element


#T= defines the name of the Clip Library element

^# the "^" character must proceed a character that is normally a Clip 
Library syntax character but which you want to use in another context (a 
Python line comment in this case)

^! is the cursor positin after the Clip Library element has been 
inserted, in this case the cursor is positioned to alloy the name of the 
script to be typed

The Clip Library element ends when the Clip Library "parser" finds 
either another element definition or the end of the file.

Clip Libraries are stored in simple text files.

This is such a simple concept but is so very productive. Who needs an 
IDE?. I would love to have a Linux text editor (like Scite or GEdit) 
that could do this.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From ferdinandsousa at gmail.com  Tue Feb  3 01:02:55 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 3 Feb 2009 11:32:55 +0530
Subject: Varibles -- copies and references
Message-ID: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>

Hi

Some weeks back I had been following the thread "Why can't assign to
function call". Today, I saw the "function scope" thread, and decided I
should ask about the behaviour below:

>>>                                                                       #
Simple variables
>>>p=55
>>> q=p
>>> q
55
>>> q=44
>>> p
55
>>>
>>>                                                                       #
In a function
>>> def dd(d):
    del d['key']
    return d

>>> adict={'pramod':'goodboy', 'ferdi':'badboy', 'key':'to be deleted'}
>>> dd(adict)
{'ferdi': 'badboy', 'pramod': 'goodboy'}
>>> adict
{'ferdi': 'badboy', 'pramod': 'goodboy'}                          #
undesirable?
>>>
>>>                                                                       #
In a class
>>>class AA:
    a=111


>>> x=AA()
>>> x.a
111
>>> y=x
>>> y.a
111
>>> y.a=222
>>> x.a
222                                                                       #
undesirable?
>>> z=copy.deepcopy(x)
>>> z.a
222
>>> z.a=444
>>> x.a
222
>>> y.a
222
>>>

Guess the simple types show the expected behaviour (even though they are
technically instances of existing classes). The user defined classes seem to
be references/shallow copies. The "function scope" thread refers to
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objectsto
explain why default parameters should not be modified. But, in the
function example above, the dictionary passed as a variable *in the calling
scope* gets modified.

How can you avoid the dictionary being changed?
Assigning one object to another always creates references? Can you modify
anything in the class def to get a copy? [I have a tingling feeling this is
how the default types (integers, strings etc) are defined]

Thanks and best regards,
Ferdi
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From Russ.Paielli at gmail.com  Tue Feb  3 01:18:20 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Mon, 2 Feb 2009 22:18:20 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com> 
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
Message-ID: <cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>

On Feb 2, 9:09?pm, a... at pythoncraft.com (Aahz) wrote:

> You favor bleeding eyes?

If I am going to bleed anywhere, I'd actually prefer it be somewhere
other than the eyes. Well, maybe not the gonads either. That's a tough
call. In any case, I use xemacs, and I've always liked color
highlighting. Not that it really helps much, but it "spices up" the
code and stimulates the eyes and brain. When I see the same code
without color highlighting, it just seems bland, like something is
missing. It seems like just "text" rather than "code."


From aahz at pythoncraft.com  Tue Feb  3 01:20:55 2009
From: aahz at pythoncraft.com (Aahz)
Date: 2 Feb 2009 22:20:55 -0800
Subject: socket.unbind or socket.unlisten?  - socket.error: (48,
	'Address already in use')
References: <20090127134145.24460.1190938528.divmod.quotient.2653@henry.divmod.com>
	<49855129.9070901@shopzeus.com>
	<mailman.8520.1233493150.3487.python-list@python.org>
	<QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d@posted.usinternet>
Message-ID: <gm8no7$hc2$1@panix3.panix.com>

In article <QaidnUXDgsrtWhjUnZ2dnUVZ_vzinZ2d at posted.usinternet>,
Grant Edwards  <grante at visi.com> wrote:
>On 2009-02-01, Steve Holden <steve at holdenweb.com> wrote:
>
>> I believe this is because Microsoft failed to understand the
>> original meaning of ___________________, and persisted with
>> this ghastly error in the name of backwards compatibility,
>> justifying it by suggesting that _________________________.
>
>Somebody should have cards printed up...

+1 QOTW
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From robert.dm.smith at gmail.com  Tue Feb  3 01:25:41 2009
From: robert.dm.smith at gmail.com (Robert D.M. Smith)
Date: Mon, 2 Feb 2009 22:25:41 -0800
Subject: global variable confusion
Message-ID: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>

I have a question on global variables and how to use them.  I have 2 files;
a.py & b.py

# a.py -----

myvar = { 'test' : '123' }

# -------
# b.py -----

from a import myvar

def test():
     a.myvar = { 'blah' : '456' }

# -----

If I *'import a*' & type *'a.myvar'* it prints 'test' & '123'.

Now, if I *'import b'* & type *'b.test()'* ... does this actually change the
contents of myvar? It seems I have to do *'print b.myvar'* to see the change
but really I want to just simply do* 'print myvar'*. I want to be able to
change myvar anywhere. Please help me grasp this concept.

Thanks in advance.

-- 
  Rob
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From banibrata.dutta at gmail.com  Tue Feb  3 01:31:44 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Tue, 3 Feb 2009 12:01:44 +0530
Subject: rfi : bestpractises for implementing secure policies in python
Message-ID: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>

Hi,
Wondering if it is at-all possible to implement "secure" (s.a. not viewable
/ tunable / tweakable) "Policies" in python ?
Use-cases:
1) License enforcement -- Same application, licensed at differential price
levels, based on various feature-sets.
2) "Parental-Control" enforcement. Application usable, with *all* features
only if adult (a particular user-id) is using, and *restricted* feature set
if a child is using it.
3) Enterprise Policy enforecement -- People from Dept-X shouldn't be able to
use the application feature-set A, but only set B. However, people from
Dept-Y should be able to feature-set A & B.

The question is for what could be a desktop (standalone) python application,
or a hosted (SaaS) application. The target user group includes "Programmers"
and "hackers", so while application need not be Fort Knox (no national
secrets or mission-critical), it need to deter basic-to-moderate hacker
attempts at bypassing policy.

Seeking best-practise advice, including alternatives s.a. mixed-Language
usage (but ideally, multi-platform / portable approaches).

-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From clp2 at rebertia.com  Tue Feb  3 01:47:21 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 22:47:21 -0800
Subject: global variable confusion
In-Reply-To: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
References: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
Message-ID: <50697b2c0902022247i5987f199n3f0b5d3e077379ad@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:25 PM, Robert D.M. Smith
<robert.dm.smith at gmail.com> wrote:
> I have a question on global variables and how to use them.  I have 2 files;
> a.py & b.py
>
> # a.py -----
>
> myvar = { 'test' : '123' }
>
> # -------
> # b.py -----
>
> from a import myvar
>
> def test():
>      a.myvar = { 'blah' : '456' }

test() will fail at runtime with a NameError. You imported only
'myvar' from 'a', not 'a' itself (i.e. there is no variable 'a'
defined with 'b', only the variable 'myvar').
Assuming you changed the import to `import a`, then yes, a.myvar (both
within 'a' itself and when accessed from 'b') would have its value
changed by test().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Tue Feb  3 01:47:41 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 22:47:41 -0800
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <7a9c25c20902022247y13b96c34q95de08644b24293c@mail.gmail.com>

>
> Guess the simple types show the expected behaviour (even though they are
> technically instances of existing classes). The user defined classes seem to
> be references/shallow copies.


I prefer to avoid the term "reference" when talking about Python semantics,
because it tends to make a lot of people get very opinionated on
"call-by-value", "call-by-preference", and such, and how they work in other
languages and it doesn't quite match up to how things work in Python.

In Python every assignment (be it x = y, def foo(): pass, and varieties) are
bindings of Objects to Names.

That's all: there's no copying going on ever. The only time Python copies an
object is if you explicitly copy it.

In this code:

    >>> p=55
    >>> q=p

An int object, 55, is bound to the name 'p' in the first line.
In the second line, the object bound to 'p' (the int object 55) is bound to
the name 'q'

There's no copying going on. At the end of this, you have two names pointing
to the same object.

When you next execute the code:

    >>> q=44

You're binding a different object (the int 44) to the name 'q'. As you show,
'p' is not modified because p and q are not /variables/ really: they're
names that point to objects. That you changed where one name points doesn't
change where another name points.

Things get interesting because Python has two kinds of types: immutable and
mutable types.

The code:

    >>> p = p + 5

Results in the object that 'p' points to being added to the object int 5,
which results in an entirely new object being created (int 60), which is
then bound to the name 'p' again. What looks like changing an int is not
changing the actual int at all, but instead creating new objects and binding
them to the name 'p'. That's because ints (like strings and tuples) are
immutable. Any operation which might appear to change it /does not/ change
it: it returns an entirely new object instead.

    >>> s = "Hello"
    >>> t = s.replace("o", "a")
    >>> s
    'Hello'
    >>> t
    'Hella'

The str.replace operation doesn't change s, it returns a new string object
that has the replace operation performed on it. You can bind the new object
to the same name as the previous one (thus making the previous one be
destroyed if no other names point to them) by

    >>> s = s.replace("o", "a")

For immutable types, when you pass the objects into functions (thus binding
the object to the name specified in the def() line), any changes to the
binding within the def don't propagate outside the function context: because
every change to the names inside the def are not changing the objects
pointed to by the names outside: they're just rebinding the internal names.

People get a confused because if you pass a  mutable object inside a def
function and mutate that object the changes /are/ propagated outside--
because now you have a name inside the function and a name outside the
object both pointing to the same object.

If you want a function to work on a copy of a mutable object passed to it,
and not the real object itself, you must explicitly make a copy of it.

This code:

    >>>class AA:
        a=111
    >>> x=AA()
    >>> x.a
    111
    >>> y=x
    >>> y.a
    111
    >>> y.a=222
    >>> x.a
    222

is demonstrating something else entirely.  A class is made with a name bound
to the classes namespace, called 'a'.

Then you're trying to access an instance's namespace to fetch the object
pointed to by its 'a' name: but with instances, if they do not have a name
of their own they will access their classes bindings instead. If you set an
"a" onto an instance, it won't be seen on another instance because that
instance's 'a' will shadow/override the classes binding.

The reason you see the "undesirable" behavior of a change to y.a showing the
same result of x.a... is because those are the *exact* same instance. You
didn't make a copy of the instance, you just made a new name and bound it to
the same instance. If you want to copy in Python you have to explicitly do
so, via the 'copy' module or any copy methods an object provides.

-breathe-

Hope that helps.

--S
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From gnujohn at gmail.com  Tue Feb  3 01:49:53 2009
From: gnujohn at gmail.com (john)
Date: Mon, 2 Feb 2009 22:49:53 -0800 (PST)
Subject: Reading text file with wierd file extension?
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>
	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com> 
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com> 
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com> 
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com> 
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<c12878c1-2ece-4857-b8dc-dfdb1c6825fb@k36g2000pri.googlegroups.com>
	<4eaab3c6-c721-4ee6-bd93-346f3ffd57f6@p36g2000prp.googlegroups.com> 
	<b671e4c0-4941-43aa-99ff-e21fe1eaff07@s1g2000prg.googlegroups.com> 
	<mailman.8666.1233625242.3487.python-list@python.org>
	<22b823cc-c707-4673-9ba1-03ff68a67bba@d36g2000prf.googlegroups.com>
	<3f280744-c393-4709-98d7-bf00366178c9@v39g2000pro.googlegroups.com>
Message-ID: <82c91293-32ff-44b5-b6a2-33054f03943d@v5g2000prm.googlegroups.com>

On Feb 2, 7:57?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 2, 8:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
> > On Feb 2, 5:40?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>
> > > [Quoting restored for reduced
>
> > > On Mon, 02 Feb 2009 22:33:50 -0000, Lionel <lionel.ke... at gmail.com> wrote:
> > > > On Feb 2, 2:01?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > >> On Feb 2, 3:43?pm, Lionel <lionel.ke... at gmail.com> wrote:
> > > >> > On Feb 2, 1:07?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > > >> >> This is written very slowly, so you can read it better:
>
> > > >> > Please post without sarcasm.
>
> > > On Usenet? ?You'll be wanting single unequivocal answers next!
>
> > > Seriously though, you had been asked several times for the traceback,
> > > so that we could stop guessing and tell you for sure what was going
> > > on, and you hadn't provided it. ?Diez's mild sarcasm was not uncalled-
> > > for. ?The fact that you didn't have a traceback partially excuses you,
> > > but it would have helped if you'd said so.
>
> > > >> > This is the output from my Python shell:
>
> > > >> > >>> DatafilePath = "C:\\C8Example1.slc"
> > > >> > >>> ResourcefilePath = DatafilePath + ".rsc"
> > > >> > >>> DatafileFH = open(DatafilePath)
> > > >> > >>> ResourceFh = open(ResourcefilePath)
> > > >> > >>> DatafilePath
>
> > > >> > 'C:\\C8Example1.slc'>>> ResourcefilePath
>
> > > >> > 'C:\\C8Example1.slc.rsc'
>
> > > >> > It seems to run without trouble. However, here is the offending code
> > > >> > in my class (followed by console output):
>
> > > >> > class C8DataType:
>
> > > >> > ? ? def __init__(self, DataFilepath):
>
> > > >> > ? ? ? ? try:
> > > >> > ? ? ? ? ? ? DataFH = open(DataFilepath, "rb")
>
> > > >> > ? ? ? ? except IOError, message:
> > > >> > ? ? ? ? ? ? # Error opening file.
> > > >> > ? ? ? ? ? ? print(message)
> > > >> > ? ? ? ? ? ? return None
>
> > > You're catching the IOError, presumably so that you can fail
> > > gracefully elsewhere. ?This may not be a particularly good
> > > idea, and in any case it stops the exception reaching the
> > > console where it would cause the traceback to be displayed.
> > > More on this later.
>
> > > >> > ? ? ? ? ResourceFilepath = DataFilepath + ".src"
>
> > > As other people have pointed out, you've got a typo here.
>
> > > >> > ? ? ? ? print(DataFilepath)
> > > >> > ? ? ? ? print(ResourceFilepath)
>
> > > >> > ? ? ? ? # Try to open resource file, catch exception:
> > > >> > ? ? ? ? try:
> > > >> > ? ? ? ? ? ? ResourceFH = open(ResourceFilepath)
>
> > > >> > ? ? ? ? except IOError, message:
> > > >> > ? ? ? ? ? ? # Error opening file.
> > > >> > ? ? ? ? ? ? print(message)
> > > >> > ? ? ? ? ? ? print("Error opening " + ResourceFilepath)
> > > >> > ? ? ? ? ? ? DataFH.close()
> > > >> > ? ? ? ? ? ? return None
>
> > > [Huge amounts of text trimmed]
>
> > > Fair enough, you're catching the IOError so that you can
> > > ensure that DataFH is closed. ?Unfortunately this concealed
> > > the traceback information, which would have made it more
> > > obvious to you what people were talking about. ?Given that
> > > this has rather stuffed your C8DataType instance, you
> > > might want to think about re-raising the exception after
> > > you've closed DataFH and letting the outer layers deal
> > > with it in a more appropriate fashion.
>
> > > Incidentally, this code isn't going to do anything useful
> > > for you anyway even after you've fixed the typo. ?DataFH
> > > and ResourceFH are both local variables to __init__ and
> > > will be tossed away when it finishes executing. ?If you
> > > want to use them later, make them self.data_fh and
> > > self.resource_fh respectively.
>
> > > (PEP 8 recommends that you use lower_case_with_underscores
> > > for variable or attribute names, and leave MixedCase for
> > > class names.)
>
> > > --
> > > Rhodri James *-* Wildebeeste Herder to the Masses- Hide quoted text -
>
> > > - Show quoted text -
>
> > Very good comments. I'll be implementing some of your suggestions, to
> > be sure. Thanks Rhodri.
>
> You could check to see if the file actually exists using os.path.exists
> (). I've found that if I use that in combination with printing the
> path variable, I sometimes discover that either my file doesn't exist
> or that my path is slightly wrong and thus Python doesn't think my
> file exists...
>
> Mike

It's weird, right?  But thanks to Grant and Rhodri, from another
newbie (me)
and to everyone else who helps us out.

John  (the "how to ask questions" text is priceless)


From clp2 at rebertia.com  Tue Feb  3 01:53:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 2 Feb 2009 22:53:59 -0800
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <50697b2c0902022253p7d9f1dd6i8e0a3cdcd9364ee8@mail.gmail.com>

On Mon, Feb 2, 2009 at 10:02 PM, Ferdinand Sousa
<ferdinandsousa at gmail.com> wrote:
> Hi
>
> Some weeks back I had been following the thread "Why can't assign to
> function call". Today, I saw the "function scope" thread, and decided I
> should ask about the behaviour below:
>
>>>>                                                                       #
>>>> Simple variables
>>>>p=55
>>>> q=p
>>>> q
> 55
>>>> q=44
>>>> p
> 55
>>>>
>>>>                                                                       #
>>>> In a function
>>>> def dd(d):
>     del d['key']
>     return d
>
>>>> adict={'pramod':'goodboy', 'ferdi':'badboy', 'key':'to be deleted'}
>>>> dd(adict)
> {'ferdi': 'badboy', 'pramod': 'goodboy'}
>>>> adict
> {'ferdi': 'badboy', 'pramod': 'goodboy'}                          #
> undesirable?
>>>>
>>>>                                                                       #
>>>> In a class
>>>>class AA:
>     a=111
>
>
>>>> x=AA()
>>>> x.a
> 111
>>>> y=x
>>>> y.a
> 111
>>>> y.a=222
>>>> x.a
> 222                                                                       #
> undesirable?
>>>> z=copy.deepcopy(x)
>>>> z.a
> 222
>>>> z.a=444
>>>> x.a
> 222
>>>> y.a
> 222
>>>>
>
> Guess the simple types show the expected behaviour (even though they are
> technically instances of existing classes). The user defined classes seem to
> be references/shallow copies. The "function scope" thread refers to
> http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects
> to explain why default parameters should not be modified. But, in the
> function example above, the dictionary passed as a variable *in the calling
> scope* gets modified.
>
> How can you avoid the dictionary being changed?
> Assigning one object to another always creates references? Can you modify
> anything in the class def to get a copy? [I have a tingling feeling this is
> how the default types (integers, strings etc) are defined]

Stephen gave a great summary of the issue; here's another popular
write-up about it: http://effbot.org/zone/call-by-object.htm

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Tue Feb  3 02:04:54 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 23:04:54 -0800
Subject: rfi : bestpractises for implementing secure policies in python
In-Reply-To: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>
References: <3de8e1f70902022231v1c2e39f9va75417781ac16b07@mail.gmail.com>
Message-ID: <7a9c25c20902022304v154dd3a1xd4756dd454ddc7bf@mail.gmail.com>

> Wondering if it is at-all possible to implement "secure" (s.a. not viewable
> / tunable / tweakable) "Policies" in python ?
> Use-cases:
> 1) License enforcement -- Same application, licensed at differential price
> levels, based on various feature-sets.
> 2) "Parental-Control" enforcement. Application usable, with *all* features
> only if adult (a particular user-id) is using, and *restricted* feature set
> if a child is using it.
> 3) Enterprise Policy enforecement -- People from Dept-X shouldn't be able
> to use the application feature-set A, but only set B. However, people from
> Dept-Y should be able to feature-set A & B.
>
> The question is for what could be a desktop (standalone) python
> application, or a hosted (SaaS) application. The target user group includes
> "Programmers" and "hackers", so while application need not be Fort Knox (no
> national secrets or mission-critical), it need to deter basic-to-moderate
> hacker attempts at bypassing policy.
>

2 and 3 are very... domain-specific. You just need to implement some sort of
login procedure where users connect with a credential, and you test those
credential vs rights defined in some configuration. Exactly what the login
mechanism is depends too much on just what you're doing with your app, and
how you define users and roles and privileges as well.

As for 1, what we do is that we distribute our main application code as a
.zip file with PYC's only and no PY's. That's more then sufficient as far as
I'm concerned. If someone knows Python and knows what's going on they can
dig into a pYC and disassemble its bytecode and fiddle.. but I don't care at
that point. Someone's going to get through if they're that determined.

As for determining license enforcement, we provide a system file which
includes several fields that define what the system is capable of doing
according to the given contract/license, then a license file which is just a
checksum of the file with a simple encryption applied to it. When the app
starts it computes a checksum of the system file, decrypts the license and
compares the checksums. If it matches, we continue on.

Its not even close to perfect: someone could find which PYC had the checking
routine and disassemble it to get the key, but... its more then good enough
IMHO. I could get more cryptic and do the decryption in a C module (perhaps
written in Cython) and try to go through more effort obfuscating it... then
they'd have to disassemble an object file and know assembly to get the key.
But that's just "harder". I'm only interested in the casual protection. But
we have a solid relationship with our customers and they all have
maintenance contracts: we keep them loyal and not interested in doing
anything like that primarily by providing continued updates and enhancements
overtime. So we're only really worried about casual tweaking bypassing the
security.

HTH,

--Stephen
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From mail at microcorp.co.za  Tue Feb  3 02:10:45 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:10:45 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>
	<6uoqvrFgh5oeU1@mid.uni-berlin.de>
Message-ID: <015a01c985d5$038efac0$0d00a8c0@hendrik>


"Diez B. Roggisch" <deets at nospam.web.de>

> Your argument would be valid if *any* of the *languages* implementing
> encapsulation would offer that real isolation. None does. So where from
> comes the feeling that this must be something a *language* should offer?
> 
> Sure one could envision a system where each object is running in it's
> micro-process. So far, this hasn't been implemented (to the best of my
> knowledge) - so making assertions about the feasibility & robustness for
> running as well as for developing are somewhat "airy", don't you think?

No.  Not airy.  Hairy, yes.

I suppose the language is a kind of wish list on my part - 
I have spent the last twenty years or so writing stuff like this 
on small processors, in assembler, and I would have loved a 
language that supported it, as well as an operating system 
(and I do not mean stuff like tiny os and others of that ilk), 
but one that really supported fast task switching to make 
the micro tasks less expensive on cheap little processors 
with scarce resources. (8031) I have written various flavours
of my own, (pre emptive, round robin, cooperative) and they 
all suffer from the speed troubles associated with task 
switching on that architecture, but in all cases the performance
was good enough to get the job done.

Most of the stuff really did follow a dataflow model
as I have described, but its all so inextricably intertwined
with the hardware and the requirements of the different 
jobs that it feels kind of hopeless to try to extract general
principles from it, except for obvious stuff like that it works
better if your queues are formal and robust, and that the
messages must contain everything that is required to get
the job done.  If you do this, then there is really no reason
to worry about how some other thing is doing it's job.
In fact if you find yourself peeking at the other task's 
innards, then it means you have to rethink the dataflow,
because you are on the wrong track - that is what I meant
when I talk of "granularity"

I have find that code re use, between different projects,
has in my case been limited to some parts of:

- Task switching code
- The ticker structure to interface to hardware
- Queues, buffers and memory management.
- Utility functions like some simple math and string handling.

Anyway this is getting a bit far away from the python
way, which does not strictly enforce the 'Pure Path' (Tm)
of:

- have loose objects as threads/processes
- send messages between them using clever queueing

So we are extremely unlikely to agree on the importance
of enforced data hiding.

:-)

- Hendrik




From cournape at gmail.com  Tue Feb  3 02:14:47 2009
From: cournape at gmail.com (David Cournapeau)
Date: Tue, 3 Feb 2009 16:14:47 +0900
Subject: is python Object oriented??
In-Reply-To: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
Message-ID: <5b8d13220902022314s7aeab97fx91610bdf89ae73a9@mail.gmail.com>

On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paielli at gmail.com> wrote:
> On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
>> > Here we go again. If you have access to the source code (as you nearly
>> > always do with Python code), then "breaking the language-enforced data
>> > hiding" is a trivial matter of deleting the word "private" (or
>> > equivalent).
>>
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
>>
>> --
>> Rhodri James *-* Wildebeeste Herder to the Masses
>
> If a library developer releases the source code of a library, any user
> can trivially "defeat" the access restrictions. But if a team of
> developers is checking in code for a project, the leader(s) of the
> project can insist that the access restrictions be respected to
> simplify the management of interfaces. The larger the team, the more
> useful that can be. That's why Java, C++, Ada, Scala, and other
> languages have a "private" keyword.

I think a lof of this "discussion" is caused by different usages of
private. My understanding is that you think private is missing in
python because there is no clear different between a member which is
published (part of the API) and one which is not (e.g. whose behavior
may change between different revisions, even minor). I agree the
underscore is not an ideal solution - it is certainly not followed by
all python code out there (not even in python itself - see distutils
for example).

But I think you are overstating the advantage of private for that
usage, at least for C++. In C++, if you have a public class in a
header:

class Foo {
    private:
        int f;
};

It means f is private (cannot be accessed outside Foo instances), but
it is declared in the public header. Actually, when people means this
kind of 'data-hiding', C++ does not bring anything to C itself - after
all, we have used FILE* for years and I have no idea about the FILE
structure.

Maybe I still lack experience, but I find neither _ prefixing nor
private/public/protected a satisfaying way to make clear what is
public API and what is not. In particular, if I have a python package
which does not use _ at all, shall I assume everything is public ?

cheers,

David


From mail at microcorp.co.za  Tue Feb  3 02:19:06 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:19:06 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<7a9c25c20902021012s2bd6bd71lf82310a07a3f194b@mail.gmail.com>
Message-ID: <015b01c985d5$047255e0$0d00a8c0@hendrik>

 Stephen Hansen  wrote:

8< --------- arguments I don't agree with -------------

>P.S. Aiee, this discussion is getting overwhelmingly long. :)

It is indeed and I do actually have other stuff to do so I shall
try to retreat with defiant dignity.

Been fun though, to see the other viewpoints when it started 
getting serious.

:-)

- Hendrik



From kurt.forrester.fec at googlemail.com  Tue Feb  3 02:28:05 2009
From: kurt.forrester.fec at googlemail.com (kurt.forrester.fec at googlemail.com)
Date: Mon, 2 Feb 2009 23:28:05 -0800 (PST)
Subject: MySQLdb and MySQL stored functions
Message-ID: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>

Hello All,


I am running
- Ubuntu 8.10
- Python 2.5.2
- MySQLdb (1, 2, 2, 'final', 0)
- MySQL Server/Client 5.0.67

I am trying to write an authentication script for a python application
that connects to a MySQL database. The database has a table named
`user` which has the fields `id`, `alias` and `password` as well as a
stored function `authenticate` as detailed below:

CREATE DEFINER=`root`@`localhost` FUNCTION `authenticate`(a TEXT, p
TEXT) RETURNS int(11)
BEGIN
DECLARE STATUS INT DEFAULT -1;
SELECT id INTO STATUS FROM user WHERE alias = a AND password = p;
RETURN STATUS;
END

table: `user`
`id` = 1
`alias` = 'captain'
`password' = 'a'

I have been executing the following query from various connections:
`SELECT authenticate('captain', 'a')` (this is what is in the table
and should return 1)
and
`SELECT authenticate('captain', 'aa')` (this is a incorrect version of
the password and should return -1)

I have tried running this query from the MySQL Query Browser and it
returns results as expected.
I have also tried query from python using the _mysql module and this
also returns results as expected.
However, when I try to use the MySQLdb module it returns an incorrect
value (it returns 1).

I wish to use the DB API 2.0 compliant module for flexibility.
Therefore I am trying to work out why the MySQLdb does not return the
value as expected (that is as it is returned by the Query Browser).

Any help would be greatly appreciated.

Kurt


From btaylordesign at gmail.com  Tue Feb  3 02:31:24 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Mon, 2 Feb 2009 23:31:24 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
Message-ID: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>

Hello everyone,

I'm having an issue specifying the path for extracting files from
a .zip archive. In my method, I have:

zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)

What is happening is that the extract method is creating a folder with
the name of 'zip_name' and extracting the files to it. Example:

if 'thumbnail_path' is 'images/inventory/thumbnails/'

extract is creating: 'images/inventory/thumbnails/test1/'

and saving the files out. How can I set the path to be exactly:
'images/inventory/thumbnails'  ?

TIA,
Brandon


From mail at microcorp.co.za  Tue Feb  3 02:31:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 3 Feb 2009 09:31:37 +0200
Subject: Threading / Queue management
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <015c01c985d5$051106e0$0d00a8c0@hendrik>

 "Power Button" <mjbuchan at gmail.com>

> My question is, how can I create the Queue in my main object and set
> the target function for the Thread Constructor to be a function in
> foo?

Just create it, giving it some name.
Then start the static long running stuff,
and pass the name you gave it.

Pass the name to the thing that starts the 
per transaction thread, so that it can pass
it to the new thread, and away you go.

You may even need an output queue, so that 
the static long running stuff knows what to do 
with the results, and a thread to handle the
final output.

- Hendrik




From apt.shansen at gmail.com  Tue Feb  3 02:53:06 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Mon, 2 Feb 2009 23:53:06 -0800
Subject: Problem using compileall
Message-ID: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>

I'm having a slight problem with pre-compiling some files for distribution
that I'm not sure where to even look for.

An excerpt from an output:

    C:\mother\Python24\core\application\sysconfig>python -m compileall .
    Listing . ...
    Compiling .\BulkListClass.py ...
    Sorry: TypeError: ('compile() expected string without null bytes',)
    Compiling .\BulkUserImporter.py ...

The BulkListClass is then not creating a PYC.

Yet, if I:

    C:\mother\Python24\core\application\sysconfig>python
    Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on
win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import BulkListClass

It imports the module fine and made the PYC file.

I'm not sure why compileall is failing to compile that file, yet Python can
import it to do so.

Any suggestions for how to debug this?

This is Python 2.4.3 on Windows Vista.

Thanks.

--S
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From thorsten at thorstenkampe.de  Tue Feb  3 03:38:32 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 09:38:32 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
Message-ID: <MPG.23f220f22aa48ce99897ba@news.individual.de>

* Aahz (2 Feb 2009 09:29:43 -0800)
> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >* Aahz (2 Feb 2009 06:30:00 -0800)
> >> In article <874ozd3cr3.fsf at benfinney.id.au>,
> >> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >>>aahz at pythoncraft.com (Aahz) writes:
> >>>>
> >>>> Just to register a contrary opinion: I *hate* syntax highlighting
> >>>
> >>>On what basis?
> >> 
> >> It makes my eyes bleed
> >
> >Ever tried sunglasses?
> 
> Polarized sunglasses don't work too well with LCD monitors

Well, the answer to your issue with syntax highlighting is to use a 
/decent/ highlighting colour scheme. Don't use that all 
purple/red/green/yellow/blue one. That's for psychedelic trips.

Use a decent colour scheme for adults and you will see that you will 
benefit from syntax highlighting.

Thorsten



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb  3 03:45:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Feb 2009 08:45:23 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
Message-ID: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 03:48:58 +0000, Rhodri James wrote:

> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com>
> wrote:
> 
>> Here we go again. If you have access to the source code (as you nearly
>> always do with Python code), then "breaking the language-enforced data
>> hiding" is a trivial matter of deleting the word "private" (or
>> equivalent).
> 
> If it's that trivial to defeat something that its proponents appear to
> want to be close to an iron-clad guarantee, what on earth is the point
> of using "private" in the first place?

Well, that is a good question.

Since it is even more trivial to defeat Python's private-by-convention 
data hiding, why even bother? Just make everything public. What on earth 
is the point of prefixing an attribute with an underscore?



I think this debate has a lot to do with people's attitudes towards "No 
User Serviceable Parts". Some people are comfortable using black-boxes, 
and if (enforced) data hiding makes it easier for others to build safe, 
efficient black-boxes, then they're willing to give up that a little bit 
of flexibility/freedom for the benefit of safe, efficient black-boxes.

Others prefer white-boxes, and are willing to give up some safety and 
efficiency, and live with increased risk and lower performance, just in 
case some day they might want to open up the white-box and replace the 
widget with a gadget.

Some of us consider that a black-box sealed with regular Phillips head 
screws is still be an effective black-box. It's not hard to find a screw 
driver and open the box, but it's still an effective barrier against 
casual and accidental tinkering while allowing deliberate tinkering.

Others take the attitude that anything short of resistance to oxy torches 
and diamond-tipped drills might as well be in a paper bag, and therefore 
there's no point to black-boxes at all.

I find this extreme position is rather incoherent. If I may paraphrase 
the argument as I see it:

"Enforced data hiding is useless, because it is utterly trivial to bypass 
it, AND it's wicked, because it makes it unbelievably painful and 
difficult to bypass it when you need to."

If it is trivial to bypass, surely it can't be that painful to bypass?

Another extreme position is that enforced data hiding is useless, that 
there is *never* any need for it *at all*, and therefore Python doesn't 
need it, there's no reason except stupid PHB's belief in cargo-cult 
coding why Python couldn't be used for controlling nuclear reactors or 
the Space Shuttle. There's been some claims remarkably close to that in 
this or the previous thread. I trust that nobody really believes this 
extreme position -- it's not that far off claiming that procedures and 
functions are pointless and stupid because we have GOTO.

(The restrictions on GOTOs is analogous to enforced data hiding. We give 
up the freedom and flexibility to jump into the middle of arbitrary 
pieces of code in order to write safer and more maintainable code.)

But as I wrote once before, it is very liberating to program in Python, 
and put responsibility for dealing with errors onto the caller. Let them 
call your methods with invalid arguments, let them mess with your 
internals, if it breaks, it's their responsibility!

Except when it isn't.

And that's when I'd like to be able to lock my classes down and enforce 
data hiding. Not all the time, because I do like white-boxes, but 
sometimes a black-box is the right choice, or the necessary choice, and 
if that makes development harder, then that's a cost I'm willing to pay. 
If I'm not willing to pay it, then I'll leave it as a nice, open, 
transparent white-box with easily messed-with internals and let the 
caller deal with the consequences of messing with the internals.

Whether you agree with that choice or not is irrelevant. *My* code, *my* 
choice: it's my decision to write code as a black-box or a white-box, 
just like it's my choice to use a BSD license or the GPL or a closed-
source proprietary license, or to make the class mutable or immutable.

If other people don't like my choices, well, you have lots of options: 
you can sub-class, you can delegate, you can use somebody else's class, 
you can write your own class, you can do without, you can fork the source 
code, you can make do with it the way it is, or you can complain to the 
Salvation Army[1] about how I'm ruining your programming experience by 
being too strict/not strict enough.

I love Python, and I'm greedy and want it all: I want a dynamic, easy-to-
use language *and* a compiler that can protect me from myself and bad 
data. I'm envious of Haskell's type-inference. I want the option to have 
the compiler warn me when some function is messing with my classes' 
internals as soon as I hit Enter, and not to have to remember to run some 
third-party tool.

I'm not going to *demand* the choice of white-box or black-box classes. I 
don't have the right to demand anything. But I can ask, I can try to make 
my case (to those who will listen), and I refuse to be brow-beaten by 
those who think Python is Just About Perfect Just The Way It Is into 
feeling *ashamed* for wanting that choice.






[1] They give a damn.

-- 
Steven


From thorsten at thorstenkampe.de  Tue Feb  3 03:53:34 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 09:53:34 +0100
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
	<cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
Message-ID: <MPG.23f22475a8ca7fd49897bb@news.individual.de>

* Russ P. (Mon, 2 Feb 2009 22:18:20 -0800 (PST))
> On Feb 2, 9:09?pm, a... at pythoncraft.com (Aahz) wrote:
> > You favor bleeding eyes?
> 
> If I am going to bleed anywhere, I'd actually prefer it be somewhere
> other than the eyes. Well, maybe not the gonads either. That's a tough
> call. In any case, I use xemacs, and I've always liked color
> highlighting. Not that it really helps much, but it "spices up" the
> code and stimulates the eyes and brain. When I see the same code
> without color highlighting, it just seems bland, like something is
> missing. It seems like just "text" rather than "code."

Absolutely correct and probably 99% of all programmers see it like that. 
The trick here is to use colour sparingly. This is not only true for 
syntax highlighting but for any kind of highlighting like in prompts and 
ls/dircolors: use it right and your ability to grasp and categorize the 
provided information will improve, use too much colour and you will go 
blind...( ;-) )

Thorsten


From kurt.forrester.fec at googlemail.com  Tue Feb  3 03:55:34 2009
From: kurt.forrester.fec at googlemail.com (kurt.forrester.fec at googlemail.com)
Date: Tue, 3 Feb 2009 00:55:34 -0800 (PST)
Subject: MySQLdb and MySQL stored functions
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>
	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
Message-ID: <0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>

On Feb 3, 8:28?am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Mon, 2 Feb 2009 23:28:05 -0800 (PST),
> kurt.forrester.... at googlemail.com declaimed the following in
> comp.lang.python:
>
> > However, when I try to use the MySQLdb module it returns an incorrect
> > value (it returns 1).
>
> > I wish to use the DB API 2.0 compliant module for flexibility.
> > Therefore I am trying to work out why the MySQLdb does not return the
> > value as expected (that is as it is returned by the Query Browser).
>
> > Any help would be greatly appreciated.
>
> ? ? ? ? Show the code!
>
> ? ? ? ? At a rough guess, given the lack of details...
>
> ? ? ? ? You forgot to .fetch() the result and are looking at the status code
> from the .execute()
> --
> ? ? ? ? Wulfraed ? ? ? ?Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ? ? ? ? ?wulfr... at bestiaria.com
> ? ? ? ? ? ? ? ? HTTP://wlfraed.home.netcom.com/
> ? ? ? ? (Bestiaria Support Staff: ? ? ? ? ? ? ? web-a... at bestiaria.com)
> ? ? ? ? ? ? ? ? HTTP://www.bestiaria.com/

Correct diagnosis.

Thanks.

Any ideas on how to suppress the warning output:
__main__:1: Warning: No data - zero rows fetched, selected, or
processed


From hongyuan1306 at gmail.com  Tue Feb  3 03:56:15 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Tue, 3 Feb 2009 16:56:15 +0800
Subject: urllib2.open always send 'Accept-Encoding: gzip, deflate' under 
	Windows
Message-ID: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>

Hi,

I wish to send a request without 'Accept-Encoding: gzip, deflate' in the
request header. Under Linux, this is not a problem, I got 'Accept-Encoding:
identity' by default.

However, under Windows (XP SP3 with Python 2.5), no matter what I try, I
always got 'Accept-Encoding: gzip, deflate' in the request header. There is
no method in urllib2 to remove or disable the sending of a header. So what I
can do is try to override the miraculously added header, like:

>>> opener = urllib2.build_opener()
>>> opener.addheaders = [('Accept-encoding', 'identity;q=1.0, gzip;q=0')]
>>> opener.open('some test url')

or

>>> request = urllib2.Request('http://www.homemaster.cn',
headers={'Accept-encoding': 'identity'})
>>> urllib2.urlopen(request)

But I always still get the annoying 'gzip, deflate' in the header (captured
by Wireshark). And in the latter case, it seems my 'Accept-encoding':
'identity' is changed into '---------------: --------', presumably because
it clashes with the system generated header of 'gzip, deflate':

GET / HTTP/1.1
Accept-Encoding: gzip, deflate
Host: www.homemaster.cn
User-Agent: Python-urllib/2.5
Connection: close
---------------: --------

Strangely I neither find the string 'gzip, deflate' in urllib2.py nor in
httplib.py. Where does it come and how can I remove it or replace it with
'identity'?

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From ferdinandsousa at gmail.com  Tue Feb  3 03:57:30 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 3 Feb 2009 14:27:30 +0530
Subject: Varibles -- copies and references
Message-ID: <a9be2b70902030057y7fa77ae5id59c9c9818226400@mail.gmail.com>

 People get a confused because if you pass a  mutable object inside a def
function and mutate that object the changes /are/ propagated outside--
because now you have a name inside the function and a name outside the
object both pointing to the same object.

Since tuples  are immutable, I guess passing tuples to functions would
achieve the result desired by me:
result = func ( (anobject) )

If you want a function to work on a copy of a mutable object passed to it,
and not the real object itself, you must explicitly make a copy of it.

Or using deepcopy within the function definition. This would be better as I
could simply pass an object to the function. I don't think there is another
way to make an object mutable by something in the class definition. Is
there?

>>>class AA:
         a=111

>>> x=AA()
>>> x.a
111
>>> y=x
>>> y.a
111
>>> y.a=222
>>> x.a
222                         # undesirable?
>>> z=copy.deepcopy(x)
>>> z.a
222
>>> z.a=444
>>> x.a
222
>>> y.a
222

The reason you see the "undesirable" behavior of a change to y.a showing the
same result of x.a... is because those are the *exact* same instance. You
didn't make a copy of the instance, you just made a new name and bound it to
the same instance. If you want to copy in Python you have to explicitly do
so, via the 'copy' module or any copy methods an object provides.

Could someone please give me an example of how to implement this copy method
for the AA class.

Going the other way:

>>> a=555
>>> d=copy.copy(a)             # Supposed to be a shallow copy
>>> d
555
>>> d=444
>>> a                                  # But, it doesn't change the original
555

Is there any way to get ints/strings to refer to the same object?

Thanks and Regards,
Ferdi
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From Russ.Paielli at gmail.com  Tue Feb  3 04:11:14 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 01:11:14 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <d80224ad-c4de-4c87-b48b-d3536dac1af9@u18g2000pro.googlegroups.com>

On Feb 3, 12:45?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:

> Another extreme position is that enforced data hiding is useless, that
> there is *never* any need for it *at all*, and therefore Python doesn't
> need it, there's no reason except stupid PHB's belief in cargo-cult
> coding why Python couldn't be used for controlling nuclear reactors or
> the Space Shuttle. There's been some claims remarkably close to that in
> this or the previous thread.

My recollection is that several people have said exactly that in no
uncertain terms, if not in this thread then in the one a few days ago.

> I trust that nobody really believes this
> extreme position -- it's not that far off claiming that procedures and
> functions are pointless and stupid because we have GOTO.

If nobody believes it, several participants here could have fooled me.


From thorsten at thorstenkampe.de  Tue Feb  3 04:20:28 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 10:20:28 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <MPG.23f22ac362c6510a9897bc@news.individual.de>

* Russ P. (Mon, 2 Feb 2009 13:51:11 -0800 (PST))
> On Feb 2, 9:02 am, thmpsn.... at gmail.com wrote:
> Several participants here keep repeating that the leading-underscore
> convention is perfectly adequate. Aside from the aesthetic problem of
> littering code with leading underscores, let me try to explain the
> problem with leading underscores.

A leading underscore is not an aesthetic problem - while I would agree 
that /multiple/ leading or trailing underscores are.
 
> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.
> 
> If a "private" keyword (or equivalent) were available, then the change
> would need to be made in only one location rather than at every
> occurrence off the identifier. That is much less error prone. Sure,
> you can argue (as I'm sure someone will) that the users of the library
> should be more careful. Yes they should, but why not let the language
> help with such low-level details. That's what high-level languages are
> for.

This scenario is highly "supposing" and doesn't look like a real-world-
case to me. But anyway: the obvious solution in my humble opinion would 
be to do something like "public_attribute = _private_attribute". But 
that would be too simple, too "unjavaesque", right?!

Thorsten


From thorsten at thorstenkampe.de  Tue Feb  3 04:29:29 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 10:29:29 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
Message-ID: <MPG.23f22ce337b4988c9897bd@news.individual.de>

* thmpsn.m.k at gmail.com (Mon, 2 Feb 2009 09:02:13 -0800 (PST))
> On Feb 2, 2:55?am, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > > This is proven
> > > by your statement above, whereby you are driving a user away,
> > > simply because the language, in one small aspect, does not
> > > give him what he wants, and the tenor of this thread has been
> > > very much: "That's how it is - like it or lump it", and no amount
> > > of careful explanation of why people want the feature has cut
> > > any ice -
> >
> > I'm missing the careful explanation. What I've heard is that the lack
> > of enforced encapsulation is "a danger". What I've heard is that
> > people want it because they've been told they should want it and
> > believe that. Why?
> 
> Who has said the latter? Are you just trying to spread FUD?

No, he's not. He's giving his and other people's impression of the pro-
private group's arguments. They construct cases that do not exist in 
reality or can more-than-easily be avoided.
 
> > There have been no "careful explanations" to answer that, in my mind.
> > And thus my response is: the practical possibility of needing access
> > vastly outweights the theoretical situation that might go bad if
> > encapsulation wasn't there. Why? Because in any real situation, IMHO,
> > *forced* encapsulation is pointless.
> 
> I think you've gotten too subjective on this matter. You might as well
> say that we don't need no stinkin' OOP, we could all just be
> programming with goto's.

It's even simpler: "don't use other people's underscores". It couldn't 
get more simple than that. 

> > > It has all the time been countered with statements
> > > about how the proponents of private attributes "don't need it",
> > > (as if they are plain dumb),
> >
> > They don't need it. No one has shown a *real* reason why. The only
> > reasons provided are "its a DANGER" that someone "MIGHT DO BAD".
> > That's not a real reason. If its your project that someone is doing
> > bad in, this is a situation which can be *clearly* specified in a
> > projects policy and coding standards and can be *trivially* tested for
> > with simple static analysis in nearly all cases. The problem is the
> > person and not the code then. There's *countless* other ways that
> > person can do bad if you're allowing them to commit blindly anything
> > into your project.
> 
> Aha! I see this attitude quite often among C/C++ people, regarding
> buffer overflows and uninitialized pointer dereferences: someone will
> say "C and C++ are unsafe languages because they allow you to overrun
> buffers", then a C/C++ zealot will respond "Hire some good
> programmers".
> 
> SAME ATTITUDE.

Not at all. Buffer overflows cannot be easily avoided in C/C++ like 
languages. On the contrary you can easily avoid other people's privates 
by simply not using their underscores. It's really that simple. Even I 
got that - and I'm a really simple guy.

Thorsten


From tjreedy at udel.edu  Tue Feb  3 04:34:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 03 Feb 2009 04:34:30 -0500
Subject: Varibles -- copies and references
In-Reply-To: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
References: <a9be2b70902022202h7627d26by43dfd432f6355e6b@mail.gmail.com>
Message-ID: <gm9334$sbd$1@ger.gmane.org>

Ferdinand Sousa wrote:
> Hi
> 
> Some weeks back I had been following the thread "Why can't assign to 
> function call". Today, I saw the "function scope" thread, and decided I 
> should ask about the behaviour below:
> 
>  >>>                                                                       
> # Simple variables
>  >>>p=55
>  >>> q=p
>  >>> q
> 55
>  >>> q=44
>  >>> p
> 55
>  >>>
>  >>>                                                                       
> # In a function
>  >>> def dd(d):
>     del d['key']
>     return d

You both mutated and returned the input object.  This is undesirable.
All built-in functions and methods that mutate an object have a verb for 
a name and return nothing.  (Ok, find an exception if you can, but that 
is the intented convention.)  Statements, of course, also have no 
'return'.  So either

def strip_key(d):
   del d['key']
# or
def stripped_of_key(d):
   newd = dict(d)
   del newd['key']
   return newd

tjr



From marco at sferacarta.com  Tue Feb  3 04:42:06 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 03 Feb 2009 10:42:06 +0100
Subject: is python Object oriented??
In-Reply-To: <MPG.23f22ac362c6510a9897bc@news.individual.de>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
Message-ID: <PjUhl.17853$8Z.4878@tornado.fastwebnet.it>

Thorsten Kampe wrote:

> This scenario is highly "supposing" and doesn't look like a real-world-
> case to me. But anyway: the obvious solution in my humble opinion would 
> be to do something like "public_attribute = _private_attribute". But 
> that would be too simple, too "unjavaesque", right?!

Yes, the use of @property is.. cheating!! Shame on you! :)



From hongyuan1306 at gmail.com  Tue Feb  3 04:48:40 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Tue, 3 Feb 2009 17:48:40 +0800
Subject: urllib2.open always send 'Accept-Encoding: gzip, deflate' under 
	Windows
In-Reply-To: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>
References: <91320d220902030056h49db6a10pe4000ef934a95a6a@mail.gmail.com>
Message-ID: <91320d220902030148u5ff6e5awd6fe9728d70da9e7@mail.gmail.com>

Hi,

I got the reason. It has nothing to do with Python and its libraries.

I have Symantec Client Security installed on the test machine, and it is
modifying the content encoding header for outgoing http request, which is a
strange thing. Disable the firewall and the problem goes away.

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From thorsten at thorstenkampe.de  Tue Feb  3 05:11:04 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Tue, 3 Feb 2009 11:11:04 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
	<PjUhl.17853$8Z.4878@tornado.fastwebnet.it>
Message-ID: <MPG.23f236a0959e393a9897be@news.individual.de>

* Marco Mariani (Tue, 03 Feb 2009 10:42:06 +0100)
> Thorsten Kampe wrote:
> > This scenario is highly "supposing" and doesn't look like a
> > real-world- case to me. But anyway: the obvious solution in my
> > humble opinion would be to do something like "public_attribute =
> > _private_attribute". But that would be too simple, too
> > "unjavaesque", right?!
> 
> Yes, the use of @property is.. cheating!! Shame on you! :)

"Decorators", right? Never used that, but I read about it...

Thorsten


From dickinsm at gmail.com  Tue Feb  3 05:19:21 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Tue, 3 Feb 2009 02:19:21 -0800 (PST)
Subject: Number of bits/sizeof int
References: <b48721aa-2509-4f5a-9558-c9aa8c058ef2@m12g2000vbp.googlegroups.com>
	<877i48obxy.fsf.mdw@metalzone.distorted.org.uk>
	<7d8c7677-e1e1-4d6a-9615-58144f776a59@t26g2000prh.googlegroups.com>
	<87wsc8mi5i.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <282bf012-2191-4178-8cc1-adfd4fa55431@u18g2000pro.googlegroups.com>

On Feb 3, 1:19?am, Mark Wooding <m... at distorted.org.uk> wrote:
> Yeah, I made some arbitrary choices about what to do with non-positive
> inputs. ?If you prefer other answers, use 'em. ?My ones work well with
> signed-magnitude representations where the sign is stored separately.

Not *that* arbitrary:  they're the same choices that were made
(after some discussion) for the int.bit_length method, which is
what the OP was looking to replace.  They're also identical
to the choices that Mathematica made for its BitLength function...

As Mark says, this seems a natural choice for sign-magnitude
representation, which is what almost every bignum library
seems to use under the hood.

Mark


From Lie.1296 at gmail.com  Tue Feb  3 05:21:56 2009
From: Lie.1296 at gmail.com (Lie)
Date: Tue, 3 Feb 2009 02:21:56 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
Message-ID: <45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>

On Feb 3, 1:37?pm, Ray <rayky... at gmail.com> wrote:
> I'll enclose the top-level commands with the if statement above...its
> just a minor change, but it seems unavoidable.
>
> Thanks again!
>
> Ray

If you really don't want the file to be changed, you could (depends on
the module) use the module as a subprocess. The ideal solution is for
the module to have an if __name__ == '__main__': to determine whether
it is being used as a module or a standalone program though.


From marco at sferacarta.com  Tue Feb  3 05:25:35 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Tue, 03 Feb 2009 11:25:35 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<874ozd3cr3.fsf@benfinney.id.au> <gm7018$j39$1@panix3.panix.com>
	<87y6woz659.fsf@benfinney.id.au> <gm8jj6$hfq$1@panix3.panix.com>
	<cf3f8c71-1602-42f1-8a2b-98360fd9bd26@i24g2000prf.googlegroups.com>
Message-ID: <zYUhl.17912$8Z.12831@tornado.fastwebnet.it>

Russ P. wrote:

> highlighting. Not that it really helps much, but it "spices up" the
> code and stimulates the eyes and brain. When I see the same code
> without color highlighting, it just seems bland, like something is
> missing. It seems like just "text" rather than "code."

Plus, it can be configured to induce seizures when the programmer tries 
to write private methods ;)



From stef.mientki at gmail.com  Tue Feb  3 05:38:25 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 3 Feb 2009 11:38:25 +0100
Subject: what IDE is the best to write python?
In-Reply-To: <4987D8B0.4030904@internode.on.net>
References: <e43b283e-3a02-47f6-a40d-beb9260f487a@p23g2000prp.googlegroups.com>
	<4987D8B0.4030904@internode.on.net>
Message-ID: <3dfd60f20902030238i609a1a25w1296c4bb5ff17cd0@mail.gmail.com>

>
>
> Clip Libraries are stored in simple text files.
>
> This is such a simple concept but is so very productive. Who needs an IDE?.
> I would love to have a Linux text editor (like Scite or GEdit) that could do
> this.
>

The code snippet manager, part of a huge IDE, but can be used as a
standalone tool on any OS, might be what your looking for
http://mientki.ruhosting.nl/data_www/pylab_works/pw_code_editor.html
you can find the code here
http://code.google.com/p/pylab-works
cheers,
Stef
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From cd at okunah.de  Tue Feb  3 05:51:40 2009
From: cd at okunah.de (Christof Donat)
Date: Tue, 03 Feb 2009 11:51:40 +0100
Subject: Bitwise 2009 ($5000 prize money)
References: <e3935f02-7353-457a-8b54-65d413edd314@l33g2000pri.googlegroups.com>
Message-ID: <gm97i8$bm9$1@svr7.m-online.net>

Hi,

> http://www.bitwise.iitkgp.ernet.in/

I'm having quite some fun reading the questions since I got this Post in 
comp.lang.c++ before. Here it is of topic and this crosspostings will 
definatelly not be a good advertisement for your contest.

Christof



From bruno.42.desthuilliers at websiteburo.invalid  Tue Feb  3 06:09:46 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 03 Feb 2009 12:09:46 +0100
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>	<005201c98549$d3eb74a0$0d00a8c0@hendrik>	<mailman.8661.1233621338.3487.python-list@python.org>	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <498825f3$0$3303$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Tue, 03 Feb 2009 03:48:58 +0000, Rhodri James wrote:
> 
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paielli at gmail.com>
>> wrote:
>>
>>> Here we go again. If you have access to the source code (as you nearly
>>> always do with Python code), then "breaking the language-enforced data
>>> hiding" is a trivial matter of deleting the word "private" (or
>>> equivalent).
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
> 
> Well, that is a good question.
> 
> Since it is even more trivial to defeat Python's private-by-convention 
> data hiding, why even bother? Just make everything public. What on earth 
> is the point of prefixing an attribute with an underscore?

To make clear it is *not* part of the API. The point is about enforced 
access restriction, not encapsulation.

> 
> I think this debate has a lot to do with people's attitudes towards "No 
> User Serviceable Parts". Some people are comfortable using black-boxes, 
> and if (enforced) data hiding makes it easier for others to build safe, 
> efficient black-boxes, then they're willing to give up that a little bit 
> of flexibility/freedom for the benefit of safe, efficient black-boxes.
> 
> Others prefer white-boxes, and are willing to give up some safety and 
> efficiency, and live with increased risk and lower performance, just in 
> case some day they might want to open up the white-box and replace the 
> widget with a gadget.

I don't see how this relates to efficiency.

> Some of us consider that a black-box sealed with regular Phillips head 
> screws is still be an effective black-box.

And most of us here go as far as considering that something as simple as 
a "warranty broke if unsealed" label is enough.

> It's not hard to find a screw 
> driver and open the box, but it's still an effective barrier against 
> casual and accidental tinkering while allowing deliberate tinkering.

Idem for a label. You *see* it, don't you ? So you cannot pretend you 
"accidentaly" opened the box.


> Others take the attitude that anything short of resistance to oxy torches 
> and diamond-tipped drills might as well be in a paper bag, and therefore 
> there's no point to black-boxes at all.

straw-man argument once again. No one here says taht there's no point to 
black-box - just that there's no point having to resort to any special 
screw-driver if and when we want to treat it as a white box.

> I find this extreme position is rather incoherent.

It's *your* oversimplification of the point against *enforced* access 
restriction that makes it incoherent.


(snip)

> Another extreme position is that enforced data hiding is useless, that 
> there is *never* any need for it *at all*, and therefore Python doesn't 
> need it, there's no reason except stupid PHB's belief in cargo-cult 
> coding why Python couldn't be used for controlling nuclear reactors or 
> the Space Shuttle.

There may be quite a lot of reasons to think (rightly or not) that 
Python is not suited for such tasks. Anyway, I personnaly don't care 
whether Python would be the right tool for such cases, because - like 
probably more than 99.99% of Python users - that's not what I'm using it 
for, and I don't see any reason to add such useless arbitrary 
restrictions just because 2 or 3 persons claims that it's "how it should 
be". FWIW, since anything dynamic would be considered unsafe in the 
mentioned use cases, the next point would be to make Python as static as 
Java. Yeah, great.

> There's been some claims remarkably close to that in 
> this or the previous thread. I trust that nobody really believes this 
> extreme position -- it's not that far off claiming that procedures and 
> functions are pointless and stupid because we have GOTO.

yet another straw man argument.

> I love Python, and I'm greedy and want it all: I want a dynamic, easy-to-
> use language *and* a compiler that can protect me from myself

That's not what compilers are for.

> and bad 
> data.

I definitly fail to see how a compiler could protect you from *runtime* 
issues ???

> I'm envious of Haskell's type-inference. I want the option to have 
> the compiler warn me when some function is messing with my classes' 
> internals as soon as I hit Enter,

May I remind you that "def" and "class" are executable statements ?

> 
> I'm not going to *demand* the choice of white-box or black-box classes. I 
> don't have the right to demand anything. But I can ask, I can try to make 
> my case (to those who will listen), and I refuse to be brow-beaten by 
> those who think Python is Just About Perfect Just The Way It Is into 
> feeling *ashamed* for wanting that choice.

It's not about Python being "Just About Perfect Just The Way It", it's 
about deciding whether enforced access restriction is of any use (at 
least for a very large majority of it's users), and if it's worth 
imposing design changes so fundamuntal they would just turn Python into 
a totally different language just because a couple guys ask for it.

Anyway: the choice is neither yours nor mine, so all this discussion is 
more than pointless. If you really want such drastic changes in Python's 
design and implementation, submit a PEP.



From mohana2004 at gmail.com  Tue Feb  3 06:53:20 2009
From: mohana2004 at gmail.com (mohana2004 at gmail.com)
Date: Tue, 3 Feb 2009 03:53:20 -0800 (PST)
Subject: Date Comparison
Message-ID: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>

Hi,
I need to compare two dates and find the number of days between those
two dates.This can be done with datetime module in python  as below,
but this is not supported in Jython.

example
from datetime import date
a=datetime.date(2009,2,1)
b=datetime.date(2008,10,10)
c= a-b
c.days
114

Is there any other function to do the same(should be supported by
Jython)

Regards,
Monyl


From crculver at christopherculver.com  Tue Feb  3 08:07:09 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 03 Feb 2009 15:07:09 +0200
Subject: Unzipping a .zip properly, and from a remote URL
Message-ID: <874ozbhdoi.fsf@christopherculver.com>

Returning to Python after several years away, I'm working on a little
script that will download a ZIP archive from a website and unzip it to
a mounted filesystem. The code is below, and it works so far, but I'm
unsure of a couple of things.

The first is, is there a way to read the .zip into memory without the
use of a temporary file? If I do archive = zipfile.ZipFile(remotedata.read())
directly without creating a temporary file, the zipfile module
complains that the data is in the wrong string type.

The second issue is that I don't know if this is the correct way to
unpack a file onto the filesystem. It's strange that the zipfile
module has no one simple function to unpack a zip onto the disk. Does
this code seem especially liable to break?

    try:
        remotedata = urllib2.urlopen(theurl)
    except IOError:
        print("Network down.")
        sys.exit()
    data = os.tmpfile()
    data.write(remotedata.read())
    
    archive = zipfile.ZipFile(data)
    if archive.testzip() != None:
        print "Invalid zipfile"
        sys.exit()
    contents = archive.namelist()

    for item in contents:
        try:
            os.makedirs(os.path.join(mountpoint, os.path.dirname(item)))
        except OSError:
            # OSError means that the dir already exists, but no matter.
            pass
        if item[-1] != "/":
            outputfile = open(os.path.join(mountpoint, item), 'w')
            outputfile.write(archive.read(item))
            outputfile.close()


From sk8in_zombi at yahoo.com.au  Tue Feb  3 08:22:01 2009
From: sk8in_zombi at yahoo.com.au (Mr SZ)
Date: Tue, 3 Feb 2009 05:22:01 -0800 (PST)
Subject: imaplib thread method anomaly
Message-ID: <113545.23852.qm@web54507.mail.re2.yahoo.com>

Hi,

I was looking at the thread functionality of IMAP4rev1 servers with the threading extension. Here is my output with debug=8 :



  02:23.02 > GDJB3 UID THREAD references UTF-8 (SEEN)
  02:23.02 < * THREAD (3)(2)(4)(1)
  02:23.02 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  02:23.03 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  02:23.03 < GDJB3 OK Thread completed.
  02:23.03 	matched r'(?P<tag>GDJB\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('GDJB3', 'OK', 'Thread completed.')
[None]

...


  02:59.22 > CNCF3 THREAD references UTF-8 (SEEN)
  02:59.23 < * THREAD (3)(2)(4)(1)
  02:59.23 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  02:59.23 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  02:59.23 < CNCF3 OK Thread completed.
  02:59.23 	matched r'(?P<tag>CNCF\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('CNCF3', 'OK', 'Thread completed.')
  02:59.23 untagged_responses[THREAD] => ['(3)(2)(4)(1)']
['(3)(2)(4)(1)']


As you can see, the first is a UID command and the second is calling the thread method. Also, the server responses are the same for both. So why is one returning None and the other returning the correct response? I'm using python2.4 and I'm stuck with it as I'm using it in a zope environment.

Regards,
SZ



" life isn't heavy enough,it flies away and floats far above action"


      Make Yahoo!7 your homepage and win a trip to the Quiksilver Pro. Find out more


From tino at wildenhain.de  Tue Feb  3 08:32:55 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 14:32:55 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <874ozbhdoi.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>
Message-ID: <49884787.9010805@wildenhain.de>

Hi,

Christopher Culver wrote:
> Returning to Python after several years away, I'm working on a little
> script that will download a ZIP archive from a website and unzip it to
> a mounted filesystem. The code is below, and it works so far, but I'm
> unsure of a couple of things.
> 
> The first is, is there a way to read the .zip into memory without the
> use of a temporary file? If I do archive = zipfile.ZipFile(remotedata.read())
> directly without creating a temporary file, the zipfile module
> complains that the data is in the wrong string type.

Which makes sense given the documentation (note you can either browse
the HTML online/offline or just use help() within the interpreter/ide:

Help on class ZipFile in module zipfile:

class ZipFile
  |  Class with methods to open, read, write, close, list zip files.
  |
  |  z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=True)
  |
  |  file: Either the path to the file, or a file-like object.
  |        If it is a path, the file will be opened and closed by ZipFile.
  |  mode: The mode can be either read "r", write "w" or append "a".
  |  compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires 
zlib).
  |  allowZip64: if True ZipFile will create files with ZIP64 extensions 
when
  |              needed, otherwise it will raise an exception when this 
would
  |              be necessary.
  |
...

so instead you would use archive = zipfile.ZipFile(remotedata)


> The second issue is that I don't know if this is the correct way to
> unpack a file onto the filesystem. It's strange that the zipfile
> module has no one simple function to unpack a zip onto the disk. Does
> this code seem especially liable to break?
> 
>     try:
>         remotedata = urllib2.urlopen(theurl)
>     except IOError:
>         print("Network down.")
>         sys.exit()
>     data = os.tmpfile()
>     data.write(remotedata.read())
> 
>     archive = zipfile.ZipFile(data)
>     if archive.testzip() != None:
>         print "Invalid zipfile"
>         sys.exit()
>     contents = archive.namelist()
> 
>     for item in contents:
...

here you should check the zipinfo entry and normalize
and clean the path just in case to avoid unpacking a zipfile
with special crafted paths (like /etc/passwd and such)

Maybe also checking for the various encodings (like utf8)
in pathnames makes sense.

The dir-creation could be put into a class with caching
of already existing subdirectories created and recursive
creation of missing subdirectories as well es to make
sure you do not ascend out of your target directory by
accident (or crafted zip, see above).

Regards
Tino
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From deets at nospam.web.de  Tue Feb  3 08:34:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 14:34:09 +0100
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <6uqvehFgpaciU1@mid.uni-berlin.de>

mohana2004 at gmail.com wrote:

> Hi,
> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.
> 
> example
> from datetime import date
> a=datetime.date(2009,2,1)
> b=datetime.date(2008,10,10)
> c= a-b
> c.days
> 114
> 
> Is there any other function to do the same(should be supported by
> Jython)

Use the java API of java.util. That methods like before and after on
date-objects.

Diez


From crculver at christopherculver.com  Tue Feb  3 08:38:09 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 03 Feb 2009 15:38:09 +0200
Subject: Unzipping a .zip properly, and from a remote URL
References: <874ozbhdoi.fsf@christopherculver.com>
	<mailman.8689.1233667986.3487.python-list@python.org>
Message-ID: <87y6wnfxoe.fsf@christopherculver.com>

Tino Wildenhain <tino at wildenhain.de> writes:
> so instead you would use archive = zipfile.ZipFile(remotedata)

That produces the following error if I try that in the Python
interpreter (URL edited for privacy):

>>> import zipfile
>>> import urllib2
>>> remotedata = urllib2.urlopen("http://...file.zip")
>>> archive = zipfile.ZipFile(remotedata)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
    self._GetContents()
  File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
    self._RealGetContents()
  File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
    endrec = _EndRecData(fp)
  File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
    fpin.seek(-22, 2)               # Assume no archive comment.
AttributeError: addinfourl instance has no attribute 'seek'


From alan.isaac at gmail.com  Tue Feb  3 08:49:36 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Tue, 03 Feb 2009 13:49:36 GMT
Subject: what IDE is the best to write python?
In-Reply-To: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <QXXhl.1002$eK2.84@nwrddc01.gnilink.net>

On 2/1/2009 2:42 AM mcheung63 at hotmail.com apparently wrote:
> Hi all
>    what IDE is the best to write python?


http://blog.sontek.net/2008/05/11/python-with-a-modular-ide-vim/

Alan Isaac

PS Also maybe see:

http://vim.sourceforge.net/scripts/script.php?script_id=30

http://www.builderau.com.au/program/python/soa/Extending-Vim-with-Python/0,2000064084,339283181,00.htm

http://www.vim.org/scripts/script.php?script_id=790

http://www.vim.org/scripts/script.php?script_id=2527

http://www.tummy.com/Community/Presentations/vimpython-20070225/vim.html


From simon at mullis.co.uk  Tue Feb  3 08:52:07 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Tue, 3 Feb 2009 14:52:07 +0100
Subject: parse date/time from a log entry with only strftime (and no regexen)
Message-ID: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>

Hi All

I'm writing a script to help with analyzing log files timestamps and have a
very specific question on which I'm momentarily stumped....

I'd like the script to support multiple log file types, so allow a strftime
format to be passed in as a cli switch (default is %Y-%m-%d %H:%M:%S).

When it comes to actually doing the analysis I want to store or discard the
log entry based on certain criteria. In fact, I only need the log line
timestamp.

I'd like to do this in one step and therefore not require the user to supply
a regex aswell as a strftime format:

>>> import datetime
>>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
    data_string[found.end():])
ValueError: unconverted data remains:  this is the remainder of the log line
that I do not care about

>>> repr(p)
NameError: name 'p' is not defined

Clearly the strptime method above can grab the right bits of data but the
string "p" is not created due to the error.

So, my options are:

1 - Only support one log format.

2 - Support any log format but require a regex as well as a strftime format
so I can extract the "timestamp" portion.

3 - Create another class/method with a lookup table for the strftime options
that automagically creates the correct regex to extract the right string
from the log entry... (or is this overly complicated)

4 - Override the method above (strptime) to allow what I'm trying to do).

4 - Some other very clever and elegant solution that I would not ever manage
to think of myself....


Am I making any sense whatsoever?

Thanks

SM

(P.S The reason I don't want the end user to supply a regex for the
timestamin he log-entry is that we're already using 2 other regexes as cli
switches to select the file glob and log line to match....)
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From wmcclain at watershade.net  Tue Feb  3 08:56:09 2009
From: wmcclain at watershade.net (Bill McClain)
Date: 3 Feb 2009 13:56:09 GMT
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <gm9idp02h1t@news4.newsguy.com>

On 2009-02-03, mohana2004 at gmail.com <mohana2004 at gmail.com> wrote:
> Hi,
> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.

There are julian day routines in this astronomy package:

    http://astrolabe.sourceforge.net/

-Bill
-- 
Sattre Press                                    In the Quarter
http://sattre-press.com/                 by Robert W. Chambers
info at sattre-press.com         http://sattre-press.com/itq.html


From simon at brunningonline.net  Tue Feb  3 09:00:34 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 3 Feb 2009 14:00:34 +0000
Subject: Date Comparison
In-Reply-To: <6uqvehFgpaciU1@mid.uni-berlin.de>
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<6uqvehFgpaciU1@mid.uni-berlin.de>
Message-ID: <8c7f10c60902030600qd6d0db3tb4e9f02914a8f093@mail.gmail.com>

2009/2/3 Diez B. Roggisch <deets at nospam.web.de>:
> Use the java API of java.util.

Or better still, use Joda.

-- 
Cheers,
Simon B.


From tino at wildenhain.de  Tue Feb  3 09:32:26 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 15:32:26 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <87y6wnfxoe.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>	<mailman.8689.1233667986.3487.python-list@python.org>
	<87y6wnfxoe.fsf@christopherculver.com>
Message-ID: <4988557A.5020407@wildenhain.de>

Christopher Culver wrote:
> Tino Wildenhain <tino at wildenhain.de> writes:
>> so instead you would use archive = zipfile.ZipFile(remotedata)
> 
> That produces the following error if I try that in the Python
> interpreter (URL edited for privacy):
> 
>>>> import zipfile
>>>> import urllib2
>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>> archive = zipfile.ZipFile(remotedata)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
>     self._GetContents()
>   File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
>     self._RealGetContents()
>   File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
>     endrec = _EndRecData(fp)
>   File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
>     fpin.seek(-22, 2)               # Assume no archive comment.
> AttributeError: addinfourl instance has no attribute 'seek'

Oh thats annoying. In this case short of providing a buffered
wrapper (which is possible) you would stick to the temp file
for an easy solution. Sorry about that.

Regards
Tino
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From jcd at sdf.lonestar.org  Tue Feb  3 09:54:16 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 03 Feb 2009 09:54:16 -0500
Subject: English-like Python
In-Reply-To: <497899D0.5030706@strout.net>
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org>
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>
	<497899D0.5030706@strout.net>
Message-ID: <1233672856.7189.7.camel@aalcdl07.lib.unc.edu>


On Thu, 2009-01-22 at 09:07 -0700, Joe Strout wrote:
> >>      Beep
> >>
> >> Doesn't get much more readable and syntax-free than that.
> > 
> > readable doesn't mean smallest amount of syntax possible sometimes
> syntax 
> > increases the readability of a text as you would see if we for
> example 
> > dropped all punctuation but you probably already knew that but
> perhaps 
> > you didnt draw the connection with programming language wink
> 
> Cute.  But I stand by my contention that "Beep" is about the most 
> readable way imaginable to express the "make a beep sound now please" 
> command, and any additional punctuation (parentheses, semicolons,
> etc.) 
> only get in the way.
> 

But what if your language allows functions to be used as first class
objects?  (Mine does :))  

x = Beep

Does that assign the name x to the Beep object or does it assign the
result of a Beep call to x?

There's no virtue in making ridiculously simple things even simpler if
it makes the interesting things impossible.

def tone_sequence(sound):
    sequence = DialTone.followed_by(sound)
    sequence()

for x in Beep, Buzz, Warble:
    tone_sequence(x)

Cheers,
Cliff




From nick at craig-wood.com  Tue Feb  3 10:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 03 Feb 2009 09:32:00 -0600
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
Message-ID: <slrngogniq.muq.nick@irishsea.home.craig-wood.com>

flagg <ianand0204 at gmail.com> wrote:
>  This xmlrpc server is designed to parse dns zone files and then
>  perform various actions on said files. \
>  It uses dnspython, and xmlrpclib
>   I'd like to know what some of the more experienced python users
>  think. Where I could improve code, make it more efficient, whatever.
>  All suggestions are welcome.  This is my first functional python
>  program,  and I have tons of questions to go along with whatever
>  suggestions.   How could I do sanity checking; right now nothing
>  checks the input to these functions, error-handling in this program is
>  almost non-existant how do you integrate decent error handling into a
>  piece of software......ill shut up now.

I made a few comments, some about error handling!  See below

>  import dns.zone
>  from time import localtime, strftime, time
>  import os, sys
>  from dns.rdataclass import *
>  from dns.rdatatype import *
>  from string import Template
>  import xmlrpclib
>  from SimpleXMLRPCServer import SimpleXMLRPCServer
>  from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
> 
> 
>  zoneDir = "/dns"
> 
>  def openZoneFile(zoneFile):
>      """
>      Opens a zone file.  Then reads in zone file to dnspython zone
>  object.
>      """
>      global zone
>      global host
>      global domain
>      domain = ".".join(zoneFile.split('.')[1:])
>      host = ".".join(zoneFile.split('.')[:1])
> 
>      try:
>              zone = dns.zone.from_file(zoneDir + domain + '.zone',
>  domain)
>      except dns.exception, e:
>              print e.__class__, e

Don't use global variables!

This function should probably return 3 things

    return zone, host, domain

And whenever you use it, say

    zone, host, domain = openZoneFile(xxx)

It should probably be a method of DNSFunctions.  I'd avoid setting
self.zone etc as that is making a different sort of global data which
I'd avoid too.

Also if the dns.zone.from_file didn't work (raises dns.exception) you
set the host and domain but the zone is left at its previous value
which probably isn't what you wanted.  I'd let the error propagate
which I think will do something sensible for the xmlrpc.

>  class DNSFunctions:
> 
>       # Not exposed to xml-rpc calls, used internally only.
>      def _writeToZoneFile(self, record):
>          """
>          Checks if zone file exists, if it does it write values to zone
>  file
>          """
> 
>          for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
>              new_serial = int(strftime('%Y%m%d00', localtime(time())))
>              if new_serial <= rdata.serial:
>                  new_serial = rdata.serial + 1
>              rdata.serial = new_serial
> 
>          if os.path.exists(zoneDir + str(zone.origin) + "zone"):
>              f = open(zoneDir + str(zone.origin) + "zone", "w")
>              zone.to_file(f)
>              f.close()
>          else:
>              print "Zone: " + zone.origin + " does not exist, please
>  add first"

This should probably be raising an exception to be caught or
propagated back to the client via xmlrpc.

> 
>      def showRecord(self, record):
>          """
>          Shows a record for a given zone. Prints out
>          TTL, IN, Record Type, IP
>          """
> 
>          openZoneFile(record)
> 
>          try:
>              rdataset = zone.get_node(host)
>              for rdata in rdataset:
>                  return str(rdata)
>          except:
>              raise Exception("Record not found")
> 
> 
>      def changeRecord(self, record, type, target):
>          """
>          Changes a dns entry.
>          @param record: which record to chance
>          @param type:  what type of record, A, MX, NS, CNAME
>          @target: if CNAME target points to HOSTNAME, if A record
>  points to IP
>          """
>          openZoneFile(record)
>          try:
>              rdataset = zone.find_rdataset(host, rdtype=type)
>          except:
>              raise Exception("You must enter a valid record and type.
>  See --usage for examples")

Don't catch all exceptions - find out which exceptions are thrown.
Consider just letting it propagate - hopefully the find_rdataset error
is descriptive enough.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jldunn2000 at googlemail.com  Tue Feb  3 10:38:38 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 3 Feb 2009 07:38:38 -0800 (PST)
Subject: Python ssh with SSH Tectia server
Message-ID: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>

Has anyone any experiencing with ssh between a python client and the
SSH Tectia server  from SSH (ssh.com) ?

Does it work?





From tino at wildenhain.de  Tue Feb  3 10:45:13 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 03 Feb 2009 16:45:13 +0100
Subject: Python ssh with SSH Tectia server
In-Reply-To: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>
References: <e51bece6-ac03-4de5-b863-45376724697c@r41g2000prr.googlegroups.com>
Message-ID: <49886689.6050409@wildenhain.de>

Hi,

loial wrote:
> Has anyone any experiencing with ssh between a python client and the
> SSH Tectia server  from SSH (ssh.com) ?

this might well be. ;)
> 
> Does it work?

Did you try? (It should however since at least openssh client worked)

Cheers
Tino
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From gagsl-py2 at yahoo.com.ar  Tue Feb  3 10:45:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 13:45:27 -0200
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
Message-ID: <op.uor8p1dfx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor  
<btaylordesign at gmail.com> escribi?:

> I'm having an issue specifying the path for extracting files from
> a .zip archive. In my method, I have:
>
> zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> What is happening is that the extract method is creating a folder with
> the name of 'zip_name' and extracting the files to it. Example:

extract will create all directories in member name. Use open instead:

with zip_file.open(zip_name + '/' + thumbnail_image) as source:
   with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
     shutil.copyfileobj(source, target)

(untested)

-- 
Gabriel Genellina



From deets at nospam.web.de  Tue Feb  3 10:48:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 16:48:53 +0100
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<6uqvehFgpaciU1@mid.uni-berlin.de>
	<mailman.8691.1233669636.3487.python-list@python.org>
Message-ID: <6ur7b5Fgq8s0U1@mid.uni-berlin.de>

Simon Brunning wrote:

> 2009/2/3 Diez B. Roggisch <deets at nospam.web.de>:
>> Use the java API of java.util.
> 
> Or better still, use Joda.
> 

"dates compare you must?"

SCNR. Didn't know of this incarnation of him...

Diez


From erobererunc at gmail.com  Tue Feb  3 10:58:49 2009
From: erobererunc at gmail.com (er)
Date: Tue, 3 Feb 2009 10:58:49 -0500
Subject: Python Global State
Message-ID: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>

Simple question, I think: Is there a way to make a completely global
variable across a slew of modules?  If not, what is the canonical way to
keep a global state?  The purpose of this is to try to prevent circular
module imports, which just sort of seems nasty.  Thank you!
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From google at mrabarnett.plus.com  Tue Feb  3 11:00:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 16:00:40 +0000
Subject: parse date/time from a log entry with only strftime (and no
	regexen)
In-Reply-To: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
Message-ID: <49886A28.2080204@mrabarnett.plus.com>

Simon Mullis wrote:
 > Hi All
 >
 > I'm writing a script to help with analyzing log files timestamps and
 > have a very specific question on which I'm momentarily stumped....
 >
 > I'd like the script to support multiple log file types, so allow a
 > strftime format to be passed in as a cli switch (default is %Y-%m-%d
 > %H:%M:%S).
 >
 > When it comes to actually doing the analysis I want to store or discard
 > the log entry based on certain criteria. In fact, I only need the log
 > line timestamp.
 >
 > I'd like to do this in one step and therefore not require the user to
 > supply a regex aswell as a strftime format:
 >
 >  >>> import datetime
 >  >>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
 > remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
 > Traceback (most recent call last):
 >   File "<stdin>", line 1, in <module>
 >   File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
 >     data_string[found.end():])
 > ValueError: unconverted data remains:  this is the remainder of the log
 > line that I do not care about
 >
 >  >>> repr(p)
 > NameError: name 'p' is not defined
 >
 > Clearly the strptime method above can grab the right bits of data but
 > the string "p" is not created due to the error.
 >
 > So, my options are:
 >
 > 1 - Only support one log format.
 >
 > 2 - Support any log format but require a regex as well as a strftime
 > format so I can extract the "timestamp" portion.
 >
 > 3 - Create another class/method with a lookup table for the strftime
 > options that automagically creates the correct regex to extract the
 > right string from the log entry... (or is this overly complicated)
 >
 > 4 - Override the method above (strptime) to allow what I'm trying to do).
 >
 > 4 - Some other very clever and elegant solution that I would not ever
 > manage to think of myself....
 >
 >
 > Am I making any sense whatsoever?
 >
 > Thanks
 >
 > SM
 >
 > (P.S The reason I don't want the end user to supply a regex for the
 > timestamin he log-entry is that we're already using 2 other regexes as
 > cli switches to select the file glob and log line to match....)
 >
If the timestamp is always at the start of the line (and I expect it is)
and is always the same length then you could calculate how long the
timestamp is from the format (eg "%Y" matches 4 characters) and use
string slicing.

If the timestamp isn't a fixed length then a generating a regex might be
needed.


From ianand0204 at gmail.com  Tue Feb  3 11:03:01 2009
From: ianand0204 at gmail.com (flagg)
Date: Tue, 3 Feb 2009 08:03:01 -0800 (PST)
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
	<slrngogniq.muq.nick@irishsea.home.craig-wood.com>
Message-ID: <106ff6e6-1c23-4adb-8d89-b59d852db458@q30g2000prq.googlegroups.com>

On Feb 3, 7:32?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> flagg <ianand0... at gmail.com> wrote:
> > ?This xmlrpc server is designed to parse dns zone files and then
> > ?perform various actions on said files. \
> > ?It uses dnspython, and xmlrpclib
> > ? I'd like to know what some of the more experienced python users
> > ?think. Where I could improve code, make it more efficient, whatever.
> > ?All suggestions are welcome. ?This is my first functional python
> > ?program, ?and I have tons of questions to go along with whatever
> > ?suggestions. ? How could I do sanity checking; right now nothing
> > ?checks the input to these functions, error-handling in this program is
> > ?almost non-existant how do you integrate decent error handling into a
> > ?piece of software......ill shut up now.
>
> I made a few comments, some about error handling! ?See below
>
>
>
> > ?import dns.zone
> > ?from time import localtime, strftime, time
> > ?import os, sys
> > ?from dns.rdataclass import *
> > ?from dns.rdatatype import *
> > ?from string import Template
> > ?import xmlrpclib
> > ?from SimpleXMLRPCServer import SimpleXMLRPCServer
> > ?from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
>
> > ?zoneDir = "/dns"
>
> > ?def openZoneFile(zoneFile):
> > ? ? ?"""
> > ? ? ?Opens a zone file. ?Then reads in zone file to dnspython zone
> > ?object.
> > ? ? ?"""
> > ? ? ?global zone
> > ? ? ?global host
> > ? ? ?global domain
> > ? ? ?domain = ".".join(zoneFile.split('.')[1:])
> > ? ? ?host = ".".join(zoneFile.split('.')[:1])
>
> > ? ? ?try:
> > ? ? ? ? ? ? ?zone = dns.zone.from_file(zoneDir + domain + '.zone',
> > ?domain)
> > ? ? ?except dns.exception, e:
> > ? ? ? ? ? ? ?print e.__class__, e
>
> Don't use global variables!
>
> This function should probably return 3 things
>
> ? ? return zone, host, domain
>
> And whenever you use it, say
>
> ? ? zone, host, domain = openZoneFile(xxx)
>
> It should probably be a method of DNSFunctions. ?I'd avoid setting
> self.zone etc as that is making a different sort of global data which
> I'd avoid too.
>
> Also if the dns.zone.from_file didn't work (raises dns.exception) you
> set the host and domain but the zone is left at its previous value
> which probably isn't what you wanted. ?I'd let the error propagate
> which I think will do something sensible for the xmlrpc.
>
>
>
> > ?class DNSFunctions:
>
> > ? ? ? # Not exposed to xml-rpc calls, used internally only.
> > ? ? ?def _writeToZoneFile(self, record):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Checks if zone file exists, if it does it write values to zone
> > ?file
> > ? ? ? ? ?"""
>
> > ? ? ? ? ?for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
> > ? ? ? ? ? ? ?new_serial = int(strftime('%Y%m%d00', localtime(time())))
> > ? ? ? ? ? ? ?if new_serial <= rdata.serial:
> > ? ? ? ? ? ? ? ? ?new_serial = rdata.serial + 1
> > ? ? ? ? ? ? ?rdata.serial = new_serial
>
> > ? ? ? ? ?if os.path.exists(zoneDir + str(zone.origin) + "zone"):
> > ? ? ? ? ? ? ?f = open(zoneDir + str(zone.origin) + "zone", "w")
> > ? ? ? ? ? ? ?zone.to_file(f)
> > ? ? ? ? ? ? ?f.close()
> > ? ? ? ? ?else:
> > ? ? ? ? ? ? ?print "Zone: " + zone.origin + " does not exist, please
> > ?add first"
>
> This should probably be raising an exception to be caught or
> propagated back to the client via xmlrpc.
>
>
>
>
>
> > ? ? ?def showRecord(self, record):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Shows a record for a given zone. Prints out
> > ? ? ? ? ?TTL, IN, Record Type, IP
> > ? ? ? ? ?"""
>
> > ? ? ? ? ?openZoneFile(record)
>
> > ? ? ? ? ?try:
> > ? ? ? ? ? ? ?rdataset = zone.get_node(host)
> > ? ? ? ? ? ? ?for rdata in rdataset:
> > ? ? ? ? ? ? ? ? ?return str(rdata)
> > ? ? ? ? ?except:
> > ? ? ? ? ? ? ?raise Exception("Record not found")
>
> > ? ? ?def changeRecord(self, record, type, target):
> > ? ? ? ? ?"""
> > ? ? ? ? ?Changes a dns entry.
> > ? ? ? ? ?@param record: which record to chance
> > ? ? ? ? ?@param type: ?what type of record, A, MX, NS, CNAME
> > ? ? ? ? ?@target: if CNAME target points to HOSTNAME, if A record
> > ?points to IP
> > ? ? ? ? ?"""
> > ? ? ? ? ?openZoneFile(record)
> > ? ? ? ? ?try:
> > ? ? ? ? ? ? ?rdataset = zone.find_rdataset(host, rdtype=type)
> > ? ? ? ? ?except:
> > ? ? ? ? ? ? ?raise Exception("You must enter a valid record and type.
> > ?See --usage for examples")
>
> Don't catch all exceptions - find out which exceptions are thrown.
> Consider just letting it propagate - hopefully the find_rdataset error
> is descriptive enough.
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Thanks for taking the time to reply I appreciate it.  Are global
variables "bad"?  Or just inefficient?

Also when you say:

"Also if the dns.zone.from_file didn't work (raises dns.exception) you
set the host and domain but the zone is left at its previous value
which probably isn't what you wanted.  I'd let the error propagate
which I think will do something sensible for the xmlrpc."

Could you elaborate on that.  Im not following what you mean by
"propagate"

Thanks again for the suggestions I'll remove the global variables and
use the method you described for assigning "host,domain and zone"


From Scott.Daniels at Acm.Org  Tue Feb  3 11:05:20 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 08:05:20 -0800
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <87y6wnfxoe.fsf@christopherculver.com>
References: <874ozbhdoi.fsf@christopherculver.com>
	<mailman.8689.1233667986.3487.python-list@python.org>
	<87y6wnfxoe.fsf@christopherculver.com>
Message-ID: <beudnSi5b-lM9xXUnZ2dnUVZ_qadnZ2d@pdx.net>

Christopher Culver wrote:
> Tino Wildenhain <tino at wildenhain.de> writes:
>> so instead you would use archive = zipfile.ZipFile(remotedata)
> That produces the following error if I try that in the Python
> interpreter (URL edited for privacy): ....
>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>> archive = zipfile.ZipFile(remotedata)

No, he means you need to pull down the remote data.  Zip  file reading
is not done in a single pass; it needs to seek to find the directory,
then again to get to the data for any particular file.  Seeking around
a file does not work so well across the net.

Try something like:
     >>> import zipfile
     >>> import urllib2
     >>> import StringIO # or cStringIO as StringIO
     >>> remotehandle = urllib2.urlopen("http://...file.zip")
     >>> zipdata = StringIO.StringIO(remotehandle.read())
     >>> remotehandle.close()
     >>> archive = zipfile.ZipFile(zipdata)
or:
     >>> with urllib2.urlopen("http://...file.zip") as remotehandle:
     ...    zipdata = StringIO.StringIO(remotehandle.read())
     ...    archive = zipfile.ZipFile(zipdata)

--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Tue Feb  3 11:10:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 03 Feb 2009 16:10:32 +0000
Subject: Python Global State
In-Reply-To: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <49886C78.5020406@mrabarnett.plus.com>

er wrote:
> Simple question, I think: Is there a way to make a completely global
> variable across a slew of modules?  If not, what is the canonical
> way to keep a global state?  The purpose of this is to try to prevent
> circular module imports, which just sort of seems nasty.  Thank you!
> 
Simple answer: no.

You can put your global state into a module which is imported wherever 
it's needed:

my_globals.py
-------------
foo = ""


module_1.py
-----------
import my_globals
...
my_globals.foo = "FOO"
...


module_2.py
-----------
import my_globals
...
print my_globals.foo
...



From mdw at distorted.org.uk  Tue Feb  3 11:10:59 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Tue, 03 Feb 2009 16:10:59 +0000
Subject: Date Comparison
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
Message-ID: <87hc3bmrfw.fsf.mdw@metalzone.distorted.org.uk>

mohana2004 at gmail.com writes:

> I need to compare two dates and find the number of days between those
> two dates.This can be done with datetime module in python  as below,
> but this is not supported in Jython.
>
> example
> from datetime import date
> a=datetime.date(2009,2,1)
> b=datetime.date(2008,10,10)
> c= a-b
> c.days
> 114

I don't understand your problem.

        Jython 2.2.1 on java1.6.0_0
        Type "copyright", "credits" or "license" for more information.
        >>> from datetime import date
        >>> a=datetime.date(2009,2,1)
        >>> b=datetime.date(2008,10,10)
        >>> c = a - b
        >>> c.days
        114

-- [mdw]


From gherron at islandtraining.com  Tue Feb  3 11:11:17 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 03 Feb 2009 08:11:17 -0800
Subject: Python Global State
In-Reply-To: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <49886CA5.9090605@islandtraining.com>

er wrote:
> Simple question, I think: Is there a way to make a completely global
> variable across a slew of modules?  

No.

> If not, what is the canonical way to keep a global state?  


But this might satisfy:

Create a module called, perhaps, global.py which contains your variables.

global.py
  VarA = None
  VarB = None

Then any module can import it and read/write the values.

  import global
  global.VarA = ...
  print global.VarB
  # and so forth



> The purpose of this is to try to prevent circular module imports,
> which just sort of seems nasty.  Thank you!

I'm not sure how that will work.


Gary Herron





From Scott.Daniels at Acm.Org  Tue Feb  3 11:12:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 08:12:29 -0800
Subject: is python Object oriented??
In-Reply-To: <mailman.8682.1233648428.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de>
	<mailman.8682.1233648428.3487.python-list@python.org>
Message-ID: <Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>

Hendrik van Rooyen wrote:
> "Diez B. Roggisch" <deets at nospam.web.de>
>> ...Sure one could envision a system where each object is running in it's
>> micro-process.
> ...  I would have loved a
> language that supported it, as well as an operating system 
> (and I do not mean stuff like tiny os and others of that ilk), 
> but one that really supported fast task switching to make 
> the micro tasks less expensive on cheap little processors 
> with scarce resources....

You might enjoy looking at QNX, since I think it is built along the
lines you are describing here.  I have an ancient copy of their OS,
but haven't followed for more than couple of decades.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Tue Feb  3 11:17:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 11:17:17 -0500
Subject: MySQLdb and MySQL stored functions
In-Reply-To: <0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
	<0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
Message-ID: <gm9qmf$den$1@ger.gmane.org>

kurt.forrester.fec at googlemail.com wrote:
> On Feb 3, 8:28 am, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
>> On Mon, 2 Feb 2009 23:28:05 -0800 (PST),
>> kurt.forrester.... at googlemail.com declaimed the following in
>> comp.lang.python:
>>
>>> However, when I try to use the MySQLdb module it returns an incorrect
>>> value (it returns 1).
>>> I wish to use the DB API 2.0 compliant module for flexibility.
>>> Therefore I am trying to work out why the MySQLdb does not return the
>>> value as expected (that is as it is returned by the Query Browser).
>>> Any help would be greatly appreciated.
>>         Show the code!
>>
>>         At a rough guess, given the lack of details...
>>
>>         You forgot to .fetch() the result and are looking at the status code
>> from the .execute()
>> --
>>         Wulfraed        Dennis Lee Bieber               KD6MOG
>>         wlfr... at ix.netcom.com              wulfr... at bestiaria.com
>>                 HTTP://wlfraed.home.netcom.com/
>>         (Bestiaria Support Staff:               web-a... at bestiaria.com)
>>                 HTTP://www.bestiaria.com/
> 
> Correct diagnosis.
> 
> Thanks.
> 
> Any ideas on how to suppress the warning output:
> __main__:1: Warning: No data - zero rows fetched, selected, or
> processed
> --
try:
    ...
except MySQLdb.Warning:
    pass

There is probably some setting you can establish with MySQL so it
doesn't raise these warnings: I have never seen one, and zero rows is a
perfectly valid retrieval result.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From exarkun at divmod.com  Tue Feb  3 11:23:43 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 3 Feb 2009 11:23:43 -0500
Subject: persistent TCP connection in python using socketserver
In-Reply-To: <80bc0bfa-f505-49f9-8d5a-f6574e6f8608@z28g2000prd.googlegroups.com>
Message-ID: <20090203162343.12853.1844552571.divmod.quotient.2903@henry.divmod.com>

On Sat, 31 Jan 2009 09:31:52 -0800 (PST), markobrien85 at gmail.com wrote:
> [snip]
>
>Cheers mate I had a look into twisted but was put off by the FAQ
>stating 1.0+ modules may or may not be stable, and only the 'core' is.
>I don't wanna be messing around with a potentially buggy server, so im
>gonna roll my own using the sockets module.
>

For what it's worth, that FAQ entry was grossly out of date.  I just
deleted it and replaced it with an entry which says the exact opposite.

Jean-Paul


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 11:48:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 14:48:28 -0200
Subject: parse date/time from a log entry with only strftime (and no
	regexen)
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
Message-ID: <op.uosbm2tsx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 11:52:07 -0200, Simon Mullis <simon at mullis.co.uk>  
escribi?:

> I'm writing a script to help with analyzing log files timestamps and  
> have a
> very specific question on which I'm momentarily stumped....
>
> I'd like the script to support multiple log file types, so allow a  
> strftime
> format to be passed in as a cli switch (default is %Y-%m-%d %H:%M:%S).

>>>> import datetime
>>>> p = datetime.datetime.strptime("2008-07-23 12:18:28 this is the
> remainder of the log line that I do not care about", "%Y-%m-%d %H:%M:%S")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/opt/local/lib/python2.5/_strptime.py", line 333, in strptime
>     data_string[found.end():])
> ValueError: unconverted data remains:  this is the remainder of the log  
> line
> that I do not care about

If the logfile has fixed width fields, you may ask the user a column range  
to extract the date/time information.

-- 
Gabriel Genellina



From gdamjan at gmail.com  Tue Feb  3 11:51:06 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Tue, 03 Feb 2009 17:51:06 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com>
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com>
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<mailman.8580.1233563045.3487.python-list@python.org>
Message-ID: <r89m56-sit.ln1@archaeopteryx.softver.org.mk>

> Why?  - Python is object oriented, but I can write whole systems
> without defining a single class.
> By analogy, if data hiding is added to language, I could write a
> whole system without hiding a single item.

I guess the problem is that you would not be able to use some libraries 
because their author thought that it would be wise to hide everything (a 
behavior fairly popular in the Java world).

Let take some http library as an example, the author would certainly 
think that hiding the socket object is the only sane thing to do.
But what if you just *have* to call that special ioctl on the socket 
object before it can work in your scenario...

In python you can easily go under the hood if you need to do it.



-- 
?????? ( http://softver.org.mk/damjan/ )

"We think it's a great consumer win, and it's a great industry win, 
to be able to ensure that with good copy protection, 
you can have so much functionality for the user", 
Jordi Rivas, Microsoft Director of Technology



From djames.suhanko at gmail.com  Tue Feb  3 11:58:27 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Tue, 3 Feb 2009 14:58:27 -0200
Subject: Window (tkinter) with no decoration
Message-ID: <fd9e6bba0902030858u32f35095tad0b8024f4394017@mail.gmail.com>

Hello, programmers!
 I would like to do a menu bar like kicker or windows menu. is possible?


-- 
Djames Suhanko
LinuxUser 158.760


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 11:59:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 14:59:07 -0200
Subject: Problem using compileall
References: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>
Message-ID: <op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>

En Tue, 03 Feb 2009 05:53:06 -0200, Stephen Hansen <apt.shansen at gmail.com>  
escribi?:

> I'm having a slight problem with pre-compiling some files for  
> distribution
> that I'm not sure where to even look for.
>
> An excerpt from an output:
>
>     C:\mother\Python24\core\application\sysconfig>python -m compileall .
>     Listing . ...
>     Compiling .\BulkListClass.py ...
>     Sorry: TypeError: ('compile() expected string without null bytes',)
>     Compiling .\BulkUserImporter.py ...
>
> The BulkListClass is then not creating a PYC.

Try this to discover whether the file actually contains a NUL byte or not:

f = open("BulkListClass.py","rb")
src = f.read()
i = src.index('\0')
print "found NUL at index", i
print repr(src[i-20:i+20])


-- 
Gabriel Genellina



From aahz at pythoncraft.com  Tue Feb  3 12:02:18 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 Feb 2009 09:02:18 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
Message-ID: <gm9taq$63d$1@panix3.panix.com>

In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>* Aahz (2 Feb 2009 09:29:43 -0800)
>> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>>* Aahz (2 Feb 2009 06:30:00 -0800)
>>>> In article <874ozd3cr3.fsf at benfinney.id.au>,
>>>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
>>>>>aahz at pythoncraft.com (Aahz) writes:
>>>>>>
>>>>>> Just to register a contrary opinion: I *hate* syntax highlighting
>>>>>
>>>>>On what basis?
>>>> 
>>>> It makes my eyes bleed
>>>
>>>Ever tried sunglasses?
>> 
>> Polarized sunglasses don't work too well with LCD monitors
>
>Well, the answer to your issue with syntax highlighting is to use a 
>/decent/ highlighting colour scheme. Don't use that all 
>purple/red/green/yellow/blue one. That's for psychedelic trips.
>
>Use a decent colour scheme for adults and you will see that you will 
>benefit from syntax highlighting.

Then I have the problem of copying around the syntax highlighting
configuration to every computer I use.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From apt.shansen at gmail.com  Tue Feb  3 12:12:53 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 09:12:53 -0800
Subject: Problem using compileall
In-Reply-To: <op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>
References: <7a9c25c20902022353o6ecafe89m32ece2e8cdeff001@mail.gmail.com>
	<op.uosb4tjkx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <7a9c25c20902030912x15397ae6k97da3d5d661f152c@mail.gmail.com>

> Try this to discover whether the file actually contains a NUL byte or not:
>
> f = open("BulkListClass.py","rb")
> src = f.read()
> i = src.index('\0')
> print "found NUL at index", i
> print repr(src[i-20:i+20])

Doh. It did. How the heck did that get there! I hadn't thought to
actually look -- which seems terribly dense in retrospect -- because I
just assumed whatever regular-Python did to compile the same file,
compileall'd duplicate. Doh. :)

Thanks.

--S


From joncle at googlemail.com  Tue Feb  3 12:14:14 2009
From: joncle at googlemail.com (Jon Clements)
Date: Tue, 3 Feb 2009 09:14:14 -0800 (PST)
Subject: Source code for csv module
References: <62a2e93e-3b86-44bc-9286-56333edd97f6@t26g2000prh.googlegroups.com>
	<55c2db4e-8c89-4443-897b-b7ef92e263f1@l33g2000pri.googlegroups.com> 
	<598543ea-2340-41dd-bc76-b787d12148ba@v5g2000prm.googlegroups.com> 
	<aqhfo4lndptd28f21f2lgoppap5mgcgpca@4ax.com>
Message-ID: <7e91345b-1fed-442c-8c4a-aa4f7b580df4@b38g2000prf.googlegroups.com>

On 3 Feb, 04:27, Tim Roberts <t... at probo.com> wrote:
> vsoler <vicente.so... at gmail.com> wrote:
>
> >I'm still interested in learning python techniques. Are there any
> >other modules (standard or complementary) that I can use in my
> >education?
>
> Are you serious about this? ?Are you not aware that virtually ALL of the
> Python standard modules are written in Python, and are included in their
> full, readable source form in every Python installation? ?\Python25\lib in
> Windows, /usr/lib/python25 in Linux.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

Okies, so the sniffer is there as readable python, but the most
interesting bit (which fair enough I made the assumption the OP was
interested in) is the reader/writer functionality -- which is
implemented as a shared library and thus, unless you have a source
install of python somewhere, there is no readable code.

Jon.


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 12:16:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 15:16:30 -0200
Subject: Where & how to deallocate resources in Python C extension
References: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>
Message-ID: <op.uoscxso1x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 21:03:18 -0200, <fredbasset1000 at gmail.com> escribi?:

> I've written a C extension, see code below, to provide a Python
> interface to a hardware watchdog timer.  As part of the initialization
> it makes some calls to mmap, I am wondering should I be making
> balanced calls to munmap in some kind of de-init function?  Do Python
> extensions have d'tors?

No, there is no way to de-initialize an extension module. That's a big  
deficiency.
In some cases you may provide your own function (and hope the users call  
it when needed), or use Py_AtExit.

-- 
Gabriel Genellina



From antoniosacchi85 at gmail.com  Tue Feb  3 12:22:12 2009
From: antoniosacchi85 at gmail.com (antoniosacchi85 at gmail.com)
Date: Tue, 3 Feb 2009 09:22:12 -0800 (PST)
Subject: Find the critical points
Message-ID: <1b1b6f12-c910-4a13-902d-3523bfe8e3f5@u18g2000pro.googlegroups.com>

someone can help me??
I am new to programing,
but I need to make some script like this:
http://blogs.nyu.edu/blogs/agc282/zia/2008/11/using_python_to_solve_optimiza.html
so th equestion is :
is possible to open it than it ask something and it tell me the
result??
thank you!!
p.s.
this is my hessiana.py:

import sympy as S
x,y=S.symbols('xy')
f=x**4+x**2-6*x*y+3*y**2
a=S.diff(f,x)
S.pprint(a)
b=S.diff(f,y)
S.pprint(b)
S.solve_system([a,b],[x,y])
H=S.hessian(f,[x,y])
M1=S.Matrix([14,-6],[-6,6])
M2=S.Matrix([2,-6],[-6,6])
S.Matrix.berkowitz_minors(M2)
S.Matrix.berkowitz_minors(M1)


From Scott.Daniels at Acm.Org  Tue Feb  3 12:25:27 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 09:25:27 -0800
Subject: Python Global State
In-Reply-To: <mailman.8699.1233677484.3487.python-list@python.org>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<mailman.8699.1233677484.3487.python-list@python.org>
Message-ID: <1uGdnW8nBLsK4BXUnZ2dnUVZ_ovinZ2d@pdx.net>

Gary Herron wrote:
> er wrote:
>> Simple question, I think: Is there a way to make a completely global
>> variable across a slew of modules?  
> 
...
> 
> Create a module called, perhaps, global.py which contains your variables.
Bad choice of names (a reserved word).  Use globals, or data or global_.
Otherwise, the advice is spot-on.

--Scott David Daniels
Scott.Daniels at Acm.Org


From no at spam.thanks  Tue Feb  3 12:31:21 2009
From: no at spam.thanks (Keith)
Date: Tue, 3 Feb 2009 17:31:21 +0000 (UTC)
Subject: Safe to get address of va_list function parameter?
References: <YSWhl.1000$eK2.715@nwrddc01.gnilink.net>
Message-ID: <ln64jrxplr.fsf@nuthaus.mib.org>

Is it safe to get the address of a va_list function parameter?

Keith


From robin at reportlab.com  Tue Feb  3 12:36:05 2009
From: robin at reportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 17:36:05 +0000
Subject: x64 speed
Message-ID: <49888085.3020709@chamonix.reportlab.co.uk>

Whilst doing some portability testing with reportlab I noticed a strange speedup 
for our unittest suite with python2.5

host  win32 xp3 unittest time=42.2 seconds
vmware RHEL x64 unittest time=30.9 seconds

so it looks like the vmware emulated system is much faster. Is it the x64 
working faster at its design sizes or perhaps the compiler or could it be the 
vmware system caching all writes etc etc? For the red hat x64 build the only 
special configuration was to use ucs2

I know that the VT bit stuff has made virtualization much better, but this seems 
a bit weird.
-- 
Robin Becker



From thmpsn.m.k at gmail.com  Tue Feb  3 12:36:54 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Tue, 3 Feb 2009 09:36:54 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
Message-ID: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>

On Feb 3, 1:14?am, David Cournapeau <courn... at gmail.com> wrote:
> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> > Here we go again. If you have access to the source code (as you nearly
> >> > always do with Python code), then "breaking the language-enforced data
> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> > equivalent).
>
> >> If it's that trivial to defeat something that its proponents appear to
> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> of using "private" in the first place?
>
> >> --
> >> Rhodri James *-* Wildebeeste Herder to the Masses
>
> > If a library developer releases the source code of a library, any user
> > can trivially "defeat" the access restrictions. But if a team of
> > developers is checking in code for a project, the leader(s) of the
> > project can insist that the access restrictions be respected to
> > simplify the management of interfaces. The larger the team, the more
> > useful that can be. That's why Java, C++, Ada, Scala, and other
> > languages have a "private" keyword.
>
> I think a lof of this "discussion" is caused by different usages of
> private. My understanding is that you think private is missing in
> python because there is no clear different between a member which is
> published (part of the API) and one which is not (e.g. whose behavior
> may change between different revisions, even minor). I agree the
> underscore is not an ideal solution - it is certainly not followed by
> all python code out there (not even in python itself - see distutils
> for example).
>
> But I think you are overstating the advantage of private for that
> usage, at least for C++. In C++, if you have a public class in a
> header:
>
> class Foo {
> ? ? private:
> ? ? ? ? int f;
>
> };
>
> It means f is private (cannot be accessed outside Foo instances), but
> it is declared in the public header. Actually, when people means this
> kind of 'data-hiding', C++ does not bring anything to C itself - after
> all, we have used FILE* for years and I have no idea about the FILE
> structure.

Your lack of knowledge about it doesn't mean that it has somehow
magically "private" members. The only reason that most of us don't
know what a FILE is is that it's definition is implementation-defined
(i.e., every compiler may define it differently).

That doesn't have anything to do with private members. For example, on
my system, <stdio.h> defines FILE as:

struct _iobuf {
        char *_ptr;
        int   _cnt;
        char *_base;
        int   _flag;
        int   _file;
        int   _charbuf;
        int   _bufsiz;
        char *_tmpfname;
        };
typedef struct _iobuf FILE;

Given this information, nothing prevents me from writing things like:

FILE* fp = fopen("file.txt", "r");
if (!fp) { /* do something */ }

printf("fp->_cnt = %d\n", fp->cnt);
printf("fp->_flag = %d\n", fp->_flag);
printf("fp->_file = %d\n", fp->_file);

fp->_flag = 0x20; // OOPS!!

> Maybe I still lack experience, but I find neither _ prefixing nor
> private/public/protected a satisfaying way to make clear what is
> public API and what is not. In particular, if I have a python package
> which does not use _ at all, shall I assume everything is public ?

Pretty much, unless maybe the code documents what you're not supposed
to access:

class IOBuf:
    def __init__(self):
        self.ptr = ""  # <- this is private!
        self.cnt = 0  # <- this is private!
        self.base = ""  # <- this is private!
        self.flag = 0  # <- this is private!
        self.file = 0  # <- this is private!
        self.charbuf = 0  # <- this is private!
        self.bufsiz = 0  # <- this is private!
        self.tmpfname = ""  # <- this is private!

Nope, not a good idea either...




From tundra at tundraware.com  Tue Feb  3 12:48:35 2009
From: tundra at tundraware.com (Tim Daneliuk)
Date: Tue, 03 Feb 2009 11:48:35 -0600
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <ikcm56-lmq.ln1@ozzie.tundraware.com>

Robin Becker wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or could
> it be the vmware system caching all writes etc etc? For the red hat x64
> build the only special configuration was to use ucs2
> 
> I know that the VT bit stuff has made virtualization much better, but
> this seems a bit weird.

Which vmware product?

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/


From Bornstub at gmail.com  Tue Feb  3 12:51:36 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Tue, 3 Feb 2009 09:51:36 -0800 (PST)
Subject: How to call python from a foreign language thread (C++)
Message-ID: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>

Hi,

I am developing a program that use DirectShow to grab audio data from
media files. DirectShow use thread to pass audio data to the callback
function in my program, and I let that callback function call another
function in Python.

I use Boost.Python to wrapper my library, the callback function :

class PythonCallback {
private:
    object m_Function;
public:
    PythonCallback(object obj)
        : m_Function(obj)
    {}

    void operator() (double time, const AudioData &data) {
        // Call the callback function in python
        m_Function(time, data);
    }
};

Here comes the problem, a thread of DirectShow calls my
PythonCallback, namely, call the function in Python. Once it calls, my
program just crash. I found this should be threading problem. Then I
found this document:

http://docs.python.org/c-api/init.html

It seems that my program can't call to Python's function from thread
directly, because there is Global Interpreter Lock. The python's GIL
is so complex, I have no idea how it works. I'm sorry, what I can do
is to ask. My question is. What should I do before and after I call a
Python function from threads?

It may looks like this.

    void operator() (double time, const AudioData &data) {
        // acquire lock
        m_Function(time, data);
        // release lock
    }

Thanks.
Victor Lin.


From steve at holdenweb.com  Tue Feb  3 12:56:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 12:56:24 -0500
Subject: Bitwise 2009 ($5000 prize money)
In-Reply-To: <gm97i8$bm9$1@svr7.m-online.net>
References: <e3935f02-7353-457a-8b54-65d413edd314@l33g2000pri.googlegroups.com>
	<gm97i8$bm9$1@svr7.m-online.net>
Message-ID: <gma0gb$3gg$1@ger.gmane.org>

Christof Donat wrote:
> Hi,
> 
>> http://www.bitwise.iitkgp.ernet.in/
> 
> I'm having quite some fun reading the questions since I got this Post in 
> comp.lang.c++ before. Here it is of topic and this crosspostings will 
> definatelly not be a good advertisement for your contest.
> 
Thanks you so much, Christof. The spam filters successfully kept this
URL out of c.l.py until you took the trouble to re-publish it.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From f.guerrieri at gmail.com  Tue Feb  3 13:01:31 2009
From: f.guerrieri at gmail.com (Francesco Guerrieri)
Date: Tue, 3 Feb 2009 19:01:31 +0100
Subject: New filters? was: Re: Bitwise 2009 ($5000 prize money)
Message-ID: <79b79e730902031001r6180b531j57c2b1247ba1865c@mail.gmail.com>

On Tue, Feb 3, 2009 at 6:56 PM, Steve Holden <steve at holdenweb.com> wrote:

> Thanks you so much, Christof. The spam filters successfully kept this
> URL out of c.l.py until you took the trouble to re-publish it.
>
> regards
>  Steve
>

Speaking of which: it seems to me that the amount of spam that I receive
from clpy has greatly reduced in the last month or so.
So it seems that the spam filters are doing a great job.

Thanks are due to the people managing them :-)

Francesco
-------------- next part --------------
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From cournape at gmail.com  Tue Feb  3 13:05:27 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 03:05:27 +0900
Subject: is python Object oriented??
In-Reply-To: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
Message-ID: <5b8d13220902031005k538c1d12ufb8bede897f43a7c@mail.gmail.com>

On Wed, Feb 4, 2009 at 2:36 AM,  <thmpsn.m.k at gmail.com> wrote:
> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
>> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
>> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
>> >> > Here we go again. If you have access to the source code (as you nearly
>> >> > always do with Python code), then "breaking the language-enforced data
>> >> > hiding" is a trivial matter of deleting the word "private" (or
>> >> > equivalent).
>>
>> >> If it's that trivial to defeat something that its proponents appear to
>> >> want to be close to an iron-clad guarantee, what on earth is the point
>> >> of using "private" in the first place?
>>
>> >> --
>> >> Rhodri James *-* Wildebeeste Herder to the Masses
>>
>> > If a library developer releases the source code of a library, any user
>> > can trivially "defeat" the access restrictions. But if a team of
>> > developers is checking in code for a project, the leader(s) of the
>> > project can insist that the access restrictions be respected to
>> > simplify the management of interfaces. The larger the team, the more
>> > useful that can be. That's why Java, C++, Ada, Scala, and other
>> > languages have a "private" keyword.
>>
>> I think a lof of this "discussion" is caused by different usages of
>> private. My understanding is that you think private is missing in
>> python because there is no clear different between a member which is
>> published (part of the API) and one which is not (e.g. whose behavior
>> may change between different revisions, even minor). I agree the
>> underscore is not an ideal solution - it is certainly not followed by
>> all python code out there (not even in python itself - see distutils
>> for example).
>>
>> But I think you are overstating the advantage of private for that
>> usage, at least for C++. In C++, if you have a public class in a
>> header:
>>
>> class Foo {
>>     private:
>>         int f;
>>
>> };
>>
>> It means f is private (cannot be accessed outside Foo instances), but
>> it is declared in the public header. Actually, when people means this
>> kind of 'data-hiding', C++ does not bring anything to C itself - after
>> all, we have used FILE* for years and I have no idea about the FILE
>> structure.
>
> Your lack of knowledge about it doesn't mean that it has somehow
> magically "private" members. The only reason that most of us don't
> know what a FILE is is that it's definition is implementation-defined
> (i.e., every compiler may define it differently).
>
> That doesn't have anything to do with private members. For example, on
> my system, <stdio.h> defines FILE as:
>
> struct _iobuf {
>        char *_ptr;
>        int   _cnt;
>        char *_base;
>        int   _flag;
>        int   _file;
>        int   _charbuf;
>        int   _bufsiz;
>        char *_tmpfname;
>        };
> typedef struct _iobuf FILE;

Hm, I guess it depends on the implementation, but it is at least
possible in C to completely hide the structure, by declaring only a
pointer, and defining the structure outside any public header file.
Then, you cannot accidentally access any member - it would result in a
compiler error.

This method is also used in C++, that's the pimpl pattern. It is used
for various purposes (avoid long compilation times when changing some
private implementation, actual data hiding), but the underlying idea
is that you hide the implementation from the public headers. That's
used for example by QT, and many other C++ libraries.

This shows quite strongly the limitations of the whole private/public
business in C++.

>
> Pretty much, unless maybe the code documents what you're not supposed
> to access:

But that's my point: that's just not true for many packages I have
used - some packages do follow the _ convention, some don't. For
example, to take an example I am somewhat familiar with: distutils
does not follow this at all. There is no documentation, and it is
almost impossible to know what's the API from implementation details,
the interface is leaking everywhere. Now, distutils is an "old"
package, but my experience at least showed me that this is relatively
common.

There are some relatively well known packages which use a different
mechanism to clearly separate the intended API, without using the _
convention, or more exactly in supplement of it.

David


From cournape at gmail.com  Tue Feb  3 13:12:55 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 03:12:55 +0900
Subject: x64 speed
In-Reply-To: <49888085.3020709@chamonix.reportlab.co.uk>
References: <49888085.3020709@chamonix.reportlab.co.uk>
Message-ID: <5b8d13220902031012oeef1b9fga08573629a83e34b@mail.gmail.com>

On Wed, Feb 4, 2009 at 2:36 AM, Robin Becker <robin at reportlab.com> wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
>
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
>
> so it looks like the vmware emulated system is much faster. Is it the x64
> working faster at its design sizes or perhaps the compiler or could it be
> the vmware system caching all writes etc etc? For the red hat x64 build the
> only special configuration was to use ucs2
>
> I know that the VT bit stuff has made virtualization much better, but this
> seems a bit weird.

It can be many things of course depending on your configuration and
what you are doing in your unit tests, but I don't find it weird at
all. I often see faster results when IO is involed in my Ubuntu in
vmware fusion than on mac os X - again, can be that the vm is not
loaded (less python packages, faster import times), Linux better IO
handling (I don't know whether this is true or not, but I could at
least imagine that linux FS generally being faster than windows or mac
os X ones, this could influence IO)

It can also be compilers differences, 32 vs 64 bits as you say, etc...
If you want to be sure, you should try a window VM :)

David


From digitig at gmail.com  Tue Feb  3 13:14:58 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 3 Feb 2009 18:14:58 +0000
Subject: what IDE is the best to write python?
In-Reply-To: <8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au>
	<20090202034654.GD30237@turki.gavron.org>
	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
Message-ID: <aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>

2009/2/3 Jervis Whitley <jervisau at gmail.com>:

> real programmers use ed.

Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
our bare teeth...

-- 
Tim Rowe


From catherine.heathcote at gmail.com  Tue Feb  3 13:19:57 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Tue, 03 Feb 2009 18:19:57 GMT
Subject: what IDE is the best to write python?
In-Reply-To: <mailman.8712.1233684902.3487.python-list@python.org>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
Message-ID: <hV%hl.29854$Sp5.19680@text.news.virginmedia.com>

Tim Rowe wrote:
> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
> 
>> real programmers use ed.
> 
> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
> our bare teeth...
> 

You had teeth!?!

Oh and hi, I shall be a new face in the crowd ;)


From rdmurray at bitdance.com  Tue Feb  3 13:27:33 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 18:27:33 +0000 (UTC)
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com>
Message-ID: <gma2al$a5p$1@ger.gmane.org>

Quoth MRAB <google at mrabarnett.plus.com>:
> er wrote:
> > Simple question, I think: Is there a way to make a completely global
> > variable across a slew of modules?  If not, what is the canonical
> > way to keep a global state?  The purpose of this is to try to prevent
> > circular module imports, which just sort of seems nasty.  Thank you!
> > 
> Simple answer: no.

I'm wondering a little about posting this, but...well, the answer actually
isn't "no".  It's just that it's not something you should _ever_ do.
The trick is to assign the value to the __builtins__ module...

--RDM

PS: I know this because Zope used to do it.  Fortunately they wised
up and refactored that code to be more sane.



From kmcbrearty at yahoo.com  Tue Feb  3 13:30:45 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Tue, 3 Feb 2009 10:30:45 -0800 (PST)
Subject: JDBC in CPYTHON
Message-ID: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>

I was wondering if anyone was aware of a JDBC DBAPI module for
cpython.  I have looked at PYJDBC and was interested in avoiding using
that extra level of ICE.  I was thinking maybe someone would have back
ported zxJDBC from Jython.  Or used that as a starting point, to
create a module and had a C based wrapper for the driver.  This type
of activity was talked about back in 2004 on this forum, but I was
wondering if anyone had newer information.

Regards,
                kmcb


From rdmurray at bitdance.com  Tue Feb  3 13:38:41 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 18:38:41 +0000 (UTC)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
	<gm7ai7$ghd$1@panix3.panix.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
Message-ID: <gma2vg$ch6$1@ger.gmane.org>

Quoth aahz at pythoncraft.com (Aahz):
> In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >* Aahz (2 Feb 2009 09:29:43 -0800)
> >> In article <MPG.23f146877dac7c309897b9 at news.individual.de>,
> >> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >>>* Aahz (2 Feb 2009 06:30:00 -0800)
> >>>> In article <874ozd3cr3.fsf at benfinney.id.au>,
> >>>> Ben Finney  <bignose+hates-spam at benfinney.id.au> wrote:
> >>>>>aahz at pythoncraft.com (Aahz) writes:
> >>>>>>
> >>>>>> Just to register a contrary opinion: I *hate* syntax highlighting
> >>>>>
> >>>>>On what basis?
> >>>> 
> >>>> It makes my eyes bleed
> >>>
> >>>Ever tried sunglasses?
> >> 
> >> Polarized sunglasses don't work too well with LCD monitors
> >
> >Well, the answer to your issue with syntax highlighting is to use a 
> >/decent/ highlighting colour scheme. Don't use that all 
> >purple/red/green/yellow/blue one. That's for psychedelic trips.
> >
> >Use a decent colour scheme for adults and you will see that you will 
> >benefit from syntax highlighting.
> 
> Then I have the problem of copying around the syntax highlighting
> configuration to every computer I use.

Well, _that's_ easy to fix.  I have a little bash script called
'synchome' that uses rsync to update the home directory on any
of the remote machines on which I work.  I've had to install
rsync on one or two of the boxes, but that's a useful thing to
do anyway.

(Granted, I still have a couple bugs to work out, where I haven't
taken the time to conditionalize things properly for some of
the more exotic machine configurations, but hey, if I spend
more time on those machines I'll get around to it...)

Now, if you are a Windows user, then I sympathise...a little  :)

--RDM



From philip at semanchuk.com  Tue Feb  3 13:44:07 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 3 Feb 2009 13:44:07 -0500
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
Message-ID: <FEA0A691-EFAE-4207-B561-539706A8339C@semanchuk.com>


On Feb 3, 2009, at 12:51 PM, Victor Lin wrote:

>
> It seems that my program can't call to Python's function from thread
> directly, because there is Global Interpreter Lock. The python's GIL
> is so complex, I have no idea how it works. I'm sorry, what I can do
> is to ask. My question is. What should I do before and after I call a
> Python function from threads?


Hi Victor,
I asked a similar question yesterday and have gotten no response yet  
-- I hope you'll have better luck. I'm writing a C extension that  
wants to implement a callback in a new thread. Here's what I think  
I've learned from reading the threads API doc. Please note that this  
is a classic case of the blind leading the blind! I'm sure some (most?  
all?) of the ideas below are wrong, but I'm hoping that thinking  
through some of this "out loud" will help both of us. Or maybe some  
more knowledgeable person will take pity on/be appalled by my  
ignorance and come to our rescue. =)

Python's infamous GIL doesn't exist when a program is single-threaded.  
Before a new thread is created, the main thread must call  
PyEval_InitThreads() to create the GIL. However, "It is not safe to  
call this function when it is unknown which thread (if any) currently  
has the global interpreter lock." Therefore my extension must do this:

i_have_the_gil = 0;
if (!PyEval_ThreadsInitialized()) {
    PyEval_InitThreads();
    /* "...when this function initializes the lock, it also acquires  
it." */
    i_have_the_gil = 1;
}

That ensures that the GIL is created.

My extension will be calling from a newly-created C thread. The  
*Python* thread doesn't exist yet; so next I have to create it.  
Therefore --

if (!i_have_the_gil)
    PyEval_AcquireLock();

// Might not actually be the main thread but conceptually
// it is OK to assume so here.
main_thread = PyThreadState_Get();

callback_thread = PyThreadState_New(main_thread->interp);

PyThreadState_Swap(callback_thread);

gstate = PyGILState_Ensure();

call_callback_function();

// Now unwind the above

PyGILState_Release(gstate);

PyThreadState_Swap(main_thread);

PyThreadState_Clear(callback_thread);

PyThreadState_Delete(callback_thread);

PyEval_ReleaseLock();


I haven't yet tested this! But hopefully it is the right idea and just  
needs a little fine tuning.

I found this discussion useful:
http://mail.python.org/pipermail/python-list/2006-November/413088.html

It includes the quote, "The current thread state API doc, as you read  
it from top to bottom now, is in fact totally confusing for anyone who  
didn't develop Python himself"

I like! =)

Cheers
Philip





From geert.discussions at gmail.com  Tue Feb  3 13:47:29 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Tue, 03 Feb 2009 19:47:29 +0100
Subject: Path question
Message-ID: <49889141.6000202@gmail.com>

Hi,

I have the following path construction:

./src/__init__.py
     /main.py
     /modules/__init__.py
             /application.py
     /ui/__init__.py
        /mainwindow/__init__.py
                   /mainwindow.py

Now I want to call the method 'MainWindow' in the module 'mainwindow', 
from the module 'application'.

I'm having the following import statement in 'applications.py':

from .. ui.mainwindow.mainwindow import MainWindow

That doesn't work.  I've also tried many other combinations like from 
..ui.mainwindow...  but none of them work.

I always get the following error:

"Attempted relative import beyond toplevel package"

How can I import the method 'MainWindow' from 'mainwindow' into 
'application', using the explicit relative import rules?

Or is there a better way to do this?
  
-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From erobererunc at gmail.com  Tue Feb  3 14:10:18 2009
From: erobererunc at gmail.com (er)
Date: Tue, 3 Feb 2009 14:10:18 -0500
Subject: Python Global State
In-Reply-To: <gma2al$a5p$1@ger.gmane.org>
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com> <gma2al$a5p$1@ger.gmane.org>
Message-ID: <775033410902031110m2437f858n4affa3a0a92dd90a@mail.gmail.com>

That was my hack for one other app, but I did it because I'd only been
studying Python for a month or two.  Glad to see others did it once as well,
but that we all wised up.  =P

It might be nice if Python could provide a global dictionary, perhaps _G{},
where you can throw things.  This is actually the solution provided by the
Lua scripting language.  Thanks for the global_ module solution, I was just
making sure that was the canonical way.

On Tue, Feb 3, 2009 at 1:27 PM, <rdmurray at bitdance.com> wrote:

> Quoth MRAB <google at mrabarnett.plus.com>:
> > er wrote:
> > > Simple question, I think: Is there a way to make a completely global
> > > variable across a slew of modules?  If not, what is the canonical
> > > way to keep a global state?  The purpose of this is to try to prevent
> > > circular module imports, which just sort of seems nasty.  Thank you!
> > >
> > Simple answer: no.
>
> I'm wondering a little about posting this, but...well, the answer actually
> isn't "no".  It's just that it's not something you should _ever_ do.
> The trick is to assign the value to the __builtins__ module...
>
> --RDM
>
> PS: I know this because Zope used to do it.  Fortunately they wised
> up and refactored that code to be more sane.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From thmpsn.m.k at gmail.com  Tue Feb  3 14:10:19 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Tue, 3 Feb 2009 11:10:19 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<mailman.8710.1233684330.3487.python-list@python.org>
Message-ID: <dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>

On Feb 3, 12:05?pm, David Cournapeau <courn... at gmail.com> wrote:
> On Wed, Feb 4, 2009 at 2:36 AM, ?<thmpsn.... at gmail.com> wrote:
> > On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
> >> On Tue, Feb 3, 2009 at 2:37 PM, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> >> >> > Here we go again. If you have access to the source code (as you nearly
> >> >> > always do with Python code), then "breaking the language-enforced data
> >> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> >> > equivalent).
>
> >> >> If it's that trivial to defeat something that its proponents appear to
> >> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> >> of using "private" in the first place?
>
> >> >> --
> >> >> Rhodri James *-* Wildebeeste Herder to the Masses
>
> >> > If a library developer releases the source code of a library, any user
> >> > can trivially "defeat" the access restrictions. But if a team of
> >> > developers is checking in code for a project, the leader(s) of the
> >> > project can insist that the access restrictions be respected to
> >> > simplify the management of interfaces. The larger the team, the more
> >> > useful that can be. That's why Java, C++, Ada, Scala, and other
> >> > languages have a "private" keyword.
>
> >> I think a lof of this "discussion" is caused by different usages of
> >> private. My understanding is that you think private is missing in
> >> python because there is no clear different between a member which is
> >> published (part of the API) and one which is not (e.g. whose behavior
> >> may change between different revisions, even minor). I agree the
> >> underscore is not an ideal solution - it is certainly not followed by
> >> all python code out there (not even in python itself - see distutils
> >> for example).
>
> >> But I think you are overstating the advantage of private for that
> >> usage, at least for C++. In C++, if you have a public class in a
> >> header:
>
> >> class Foo {
> >> ? ? private:
> >> ? ? ? ? int f;
>
> >> };
>
> >> It means f is private (cannot be accessed outside Foo instances), but
> >> it is declared in the public header. Actually, when people means this
> >> kind of 'data-hiding', C++ does not bring anything to C itself - after
> >> all, we have used FILE* for years and I have no idea about the FILE
> >> structure.
>
> > Your lack of knowledge about it doesn't mean that it has somehow
> > magically "private" members. The only reason that most of us don't
> > know what a FILE is is that it's definition is implementation-defined
> > (i.e., every compiler may define it differently).
>
> > That doesn't have anything to do with private members. For example, on
> > my system, <stdio.h> defines FILE as:
>
> > struct _iobuf {
> > ? ? ? ?char *_ptr;
> > ? ? ? ?int ? _cnt;
> > ? ? ? ?char *_base;
> > ? ? ? ?int ? _flag;
> > ? ? ? ?int ? _file;
> > ? ? ? ?int ? _charbuf;
> > ? ? ? ?int ? _bufsiz;
> > ? ? ? ?char *_tmpfname;
> > ? ? ? ?};
> > typedef struct _iobuf FILE;
>
> Hm, I guess it depends on the implementation, but it is at least
> possible in C to completely hide the structure, by declaring only a
> pointer, and defining the structure outside any public header file.
> Then, you cannot accidentally access any member - it would result in a
> compiler error.

I've done that to implement ADTs (abstract data types, also known as
opaque types), but it's far from optimal, mainly because:

- The compiler doesn't know the size of the class/struct (since it
hasn't seen its definition), so you have to provide some sort of
"constructor" function that's defined in the same file in which the
class/struct is defined. This function will allocate memory for the
object using malloc()/new and return a pointer to it. Of course, since
memory allocated using malloc()/new has to be released using free()/
delete, you also have to provide a "destructor" function that does
this, and the user *always* has to call both the constructor function
and the destructor function *explicitly*, which is VERY cumbersome (as
opposed to C++ constructors/destructors, which are called
automatically at object creation/deletion, and which you don't always
need to provide unless you have to do some initialization/cleanup).

- Memory allocated with malloc()/new is allocated on the heap (as
opposed to variables that you simply declare locally, which are
allocated on the stack), and heap memory allocation is slower than
stack memory allocation (not that you have to worry about this
overhead except in really high-performance applications).

In short, you pay too high a price for using an object whose size
isn't known at compile time.

> This method is also used in C++, that's the pimpl pattern. It is used
> for various purposes (avoid long compilation times when changing some
> private implementation, actual data hiding), but the underlying idea
> is that you hide the implementation from the public headers. That's
> used for example by QT, and many other C++ libraries.
>
> This shows quite strongly the limitations of the whole private/public
> business in C++.

What limitations? The only limitations I see are the ones associated
with opaque types (what you mentioned above).



From giles.thomas at resolversystems.com  Tue Feb  3 14:12:45 2009
From: giles.thomas at resolversystems.com (Giles Thomas)
Date: Tue, 3 Feb 2009 11:12:45 -0800 (PST)
Subject: Resolver One 1.4 beta - with IronPython 2.0 and numpy
Message-ID: <c1dddae8-fef3-4380-949a-6ab24818456d@v18g2000pro.googlegroups.com>

Hi all,

Version 1.4 of Resolver One, our Pythonic spreadsheet, uses the
Ironclad project to provide (alpha-level) support for numpy in a
IronPython application.  You can put numpy matrices in spreadsheet
cells and manipulate them like any other data - there's a 4-minute
screencast here: <http://www.resolversystems.com/screencasts/numpy/>

We're releasing the beta tomorrow: this has a few performance problems
but is otherwise functionally complete.  If you're interested in
trying it out, drop me a line.


Best regards,

Giles
--
Giles Thomas
MD & CTO, Resolver Systems Ltd.
giles.thomas at resolversystems.com
+44 (0) 20 7253 6372

Win up to $17,000 for a spreadsheet: <http://www.resolversystems.com/
competition/>

17a Clerkenwell Road, London EC1M 5RD, UK
VAT No.: GB 893 5643 79
Registered in England and Wales as company number 5467329.
Registered address: 843 Finchley Road, London NW11 8NA, UK


From btaylordesign at gmail.com  Tue Feb  3 14:16:25 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 11:16:25 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
Message-ID: <4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>

On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> <btaylordes... at gmail.com> escribi?:
>
> > I'm having an issue specifying the path for extracting files from
> > a .zip archive. In my method, I have:
>
> > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> > What is happening is that the extract method is creating a folder with
> > the name of 'zip_name' and extracting the files to it. Example:
>
> extract will create all directories in member name. Use open instead:
>
> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
> ? ? ?shutil.copyfileobj(source, target)
>
> (untested)
>
> --
> Gabriel Genellina


Hi Gabriel,

Thank you for the code sample. I figured I was going to have to use
'open', but I completely forgot about the 'with' statement. I was
trying to figure out how to get access to the file object in the zip
without having to loop over all of the items, and 'with' will allow me
to do just that.

I'll give it a shot when I get home this evening and post my results.

Kind regards,
Brandon


From deets at nospam.web.de  Tue Feb  3 14:22:25 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 20:22:25 +0100
Subject: Path question
In-Reply-To: <mailman.8716.1233686855.3487.python-list@python.org>
References: <mailman.8716.1233686855.3487.python-list@python.org>
Message-ID: <6urjrhFgvif8U1@mid.uni-berlin.de>

Geert Vancompernolle schrieb:
> Hi,
> 
> I have the following path construction:
> 
> ./src/__init__.py
>     /main.py
>     /modules/__init__.py
>             /application.py
>     /ui/__init__.py
>        /mainwindow/__init__.py
>                   /mainwindow.py
> 
> Now I want to call the method 'MainWindow' in the module 'mainwindow', 
> from the module 'application'.
> 
> I'm having the following import statement in 'applications.py':
> 
> from .. ui.mainwindow.mainwindow import MainWindow
> 
> That doesn't work.  I've also tried many other combinations like from 
> ..ui.mainwindow...  but none of them work.
> 
> I always get the following error:
> 
> "Attempted relative import beyond toplevel package"
> 
> How can I import the method 'MainWindow' from 'mainwindow' into 
> 'application', using the explicit relative import rules?
> 
> Or is there a better way to do this?
>  

Rename "src" to "myapp", and start main.py from above that. That should 
work.



Diez


From rdmurray at bitdance.com  Tue Feb  3 14:25:16 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 3 Feb 2009 19:25:16 +0000 (UTC)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<5b8d13220902031005k538c1d12ufb8bede897f43a7c@mail.gmail.com>
Message-ID: <gma5mr$nae$1@ger.gmane.org>

Quoth David Cournapeau <cournape at gmail.com>:
> On Wed, Feb 4, 2009 at 2:36 AM,  <thmpsn.m.k at gmail.com> wrote:
> >
> > Pretty much, unless maybe the code documents what you're not supposed
> > to access:
> 
> But that's my point: that's just not true for many packages I have
> used - some packages do follow the _ convention, some don't. For
> example, to take an example I am somewhat familiar with: distutils
> does not follow this at all. There is no documentation, and it is
> almost impossible to know what's the API from implementation details,
> the interface is leaking everywhere. Now, distutils is an "old"
> package, but my experience at least showed me that this is relatively
> common.
> 
> There are some relatively well known packages which use a different
> mechanism to clearly separate the intended API, without using the _
> convention, or more exactly in supplement of it.

This whole issue gets more complicated, I think, when you consider that
what is "public" versus "private" in an API depends on the consumer.
That is, you might have a group of modules that use a package-internal
interface, while what the "outside world" is supposed to use is a more
restricted API.  The package-internal interface isn't _private_ in the
sense of hiding things from anybody outside the class or its subclasses,
but neither is it public.

I won't be surprised to hear that languages with data hiding have some
provision for this, but to my mind this is a "one, two, many" situation.
That is, if you have one case, things are trivially simple.  If you have
two cases, you can differentiate them.  But once you have three cases,
you almost certainly have _more_ than three cases...in other words a
problem in generalization.

In my code I generally use _ for stuff that is class-private, and document
the "outside" or "stable" API, and everything else is...whatever it needs
to be.  Perhaps the packages you are thinking of do something similar?

--RDM



From gandalf at shopzeus.com  Tue Feb  3 14:32:51 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 03 Feb 2009 20:32:51 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
Message-ID: <49889BE3.7030206@shopzeus.com>

Does anyone know how to get firebird 1.5 driver (kinterbasdb) for 
FireBird 1.5?

My problem:

    * python 2.6 already installed on a server
    * there is a firebird 1.5 database on the same server
    * I need to access it from python 2.6

Any thoughts?




From steve at holdenweb.com  Tue Feb  3 14:37:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 14:37:08 -0500
Subject: what IDE is the best to write python?
In-Reply-To: <aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<aee48b3c0902031014m23d42f9bs84dfaea11c370fb6@mail.gmail.com>
Message-ID: <gma6d8$p20$1@ger.gmane.org>

Tim Rowe wrote:
> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
> 
>> real programmers use ed.
> 
> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
> our bare teeth...
> 
Cards? Teeth? You were lucky! We 'ad ter stare at t'paper tape until the
intensity of our gaze burned holes in it. If yer got one wrong yer 'ad
ter tear it up and start all over again.

And yer tell these young folk and they just don't believe yer.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From martin at v.loewis.de  Tue Feb  3 14:58:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 03 Feb 2009 20:58:41 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <4988a1f1$0$3390$9b622d9e@news.freenet.de>

Robin Becker wrote:
> Whilst doing some portability testing with reportlab I noticed a strange
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or could
> it be the vmware system caching all writes etc etc? 

I follow David's guess that Linux does better IO than Windows (not
knowing anything about the benchmark, of course)

Regards,
Martin


From jcd at sdf.lonestar.org  Tue Feb  3 15:01:17 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 03 Feb 2009 15:01:17 -0500
Subject: English-like Python
In-Reply-To: <498863CF.7010402@strout.net>
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org>
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>
	<497899D0.5030706@strout.net>
	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu>
	<498863CF.7010402@strout.net>
Message-ID: <1233691277.9141.6.camel@aalcdl07.lib.unc.edu>


On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
> J. Cliff Dyer wrote:
> 
> > But what if your language allows functions to be used as first class
> > objects?  (Mine does :))  
> > 
> > x = Beep
> > 
> > Does that assign the name x to the Beep object or does it assign the
> > result of a Beep call to x?
> 
> It assigns the result.  To assign the name to the Beep object requires a 
> bit of additional syntax; in RB, this would be
> 
>   x = AddressOf Beep
> 
> > There's no virtue in making ridiculously simple things even simpler if
> > it makes the interesting things impossible.
> 
> Of course.  The goal is (or should be) to make the common things 
> ridiculously simple, and make the uncommon things only somewhat less so. 
>   Even in Python, it is far more common to invoke a function than to 
> need a reference to it.  So invoking a function should be the thing that 
> requires no extra syntax (even including "()").  Getting a reference to 
> it, which is less common, should be the thing that requires more syntax.
> 

Except that now you have introduced an inconsistency into python.  What
does the following mean?

my_object = MyObject()
x = my_object

What if MyObject defines a method named __call__?

Now some objects are passed around using

x = my_object

while others require

x = AddressOf my_object

and the only way to tell which is which is to check the object for the
presence of a __call__ method.  

This seems like a serious inconsistency to me.

> Cheers,
> - Joe
> 

Cliff



From mccredie at gmail.com  Tue Feb  3 15:03:17 2009
From: mccredie at gmail.com (Matimus)
Date: Tue, 3 Feb 2009 12:03:17 -0800 (PST)
Subject: Window (tkinter) with no decoration
References: <mailman.8704.1233680790.3487.python-list@python.org>
Message-ID: <28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>

On Feb 3, 8:58?am, Djames Suhanko <djames.suha... at gmail.com> wrote:
> Hello, programmers!
> ?I would like to do a menu bar like kicker or windows menu. is possible?
>
> --
> Djames Suhanko
> LinuxUser 158.760

Maybe you are looking for this?

import Tkinter

rt = Tkinter.Tk()
rt.overrideredirect(True)

# do stuff


Matt


From robert.kern at gmail.com  Tue Feb  3 15:18:37 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 03 Feb 2009 14:18:37 -0600
Subject: what IDE is the best to write python?
In-Reply-To: <hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <gma8qu$38g$1@ger.gmane.org>

On 2009-02-03 12:19, Catherine Heathcote wrote:
> Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>
>>> real programmers use ed.
>>
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>
> You had teeth!?!
>
> Oh and hi, I shall be a new face in the crowd ;)

Welcome!

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From djames.suhanko at gmail.com  Tue Feb  3 15:18:38 2009
From: djames.suhanko at gmail.com (Djames Suhanko)
Date: Tue, 3 Feb 2009 18:18:38 -0200
Subject: Window (tkinter) with no decoration
In-Reply-To: <28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>
References: <mailman.8704.1233680790.3487.python-list@python.org>
	<28e2c428-8fe3-4162-b490-39c883f12683@l33g2000pri.googlegroups.com>
Message-ID: <fd9e6bba0902031218n34042080pac79e73b862d24b9@mail.gmail.com>

Exactly !
 I thank you very much, Matimus !!!

>>  I would like to do a menu bar like kicker or windows menu. is possible?

> Maybe you are looking for this?
> rt = Tkinter.Tk()
> rt.overrideredirect(True)


-- 
Djames Suhanko
LinuxUser 158.760


From deets at nospam.web.de  Tue Feb  3 15:27:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 03 Feb 2009 21:27:48 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <6urnm4Fgv092U1@mid.uni-berlin.de>

Robin Becker schrieb:
> Whilst doing some portability testing with reportlab I noticed a strange 
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the 
> x64 working faster at its design sizes or perhaps the compiler or could 
> it be the vmware system caching all writes etc etc? For the red hat x64 
> build the only special configuration was to use ucs2
> 
> I know that the VT bit stuff has made virtualization much better, but 
> this seems a bit weird.


AFAIK some VMs have difficulties with timers. For example, my 
virtualized KDE has that jumping icon when starting a program - and 
that's *much* faster jumping inside VBox :)

So - are you sure it *is* faster?

Diez


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 15:28:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 18:28:54 -0200
Subject: Safe to get address of va_list function parameter?
References: <YSWhl.1000$eK2.715@nwrddc01.gnilink.net>
	<ln64jrxplr.fsf@nuthaus.mib.org>
Message-ID: <op.uoslugeix6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 03 Feb 2009 15:31:21 -0200, Keith <no at spam.thanks> escribi?:

> Is it safe to get the address of a va_list function parameter?

Wrong group...

-- 
Gabriel Genellina



From istvan.albert at gmail.com  Tue Feb  3 15:34:00 2009
From: istvan.albert at gmail.com (Istvan Albert)
Date: Tue, 3 Feb 2009 12:34:00 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com> 
	<gm5c08$386$1@panix3.panix.com> <874ozd3cr3.fsf@benfinney.id.au> 
	<gm7018$j39$1@panix3.panix.com>
	<MPG.23f146877dac7c309897b9@news.individual.de>
Message-ID: <e05495f4-7b4d-4186-95c0-70ea7eec3fa4@u1g2000vbb.googlegroups.com>

On Feb 2, 12:06?pm, Thorsten Kampe <thors... at thorstenkampe.de> wrote:

> > It makes my eyes bleed
>
> Ever tried sunglasses?

Sunglasses for bleeding eyes? For pete's sake try bandages.


From dunmer at dreams.sk  Tue Feb  3 15:47:22 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 21:47:22 +0100
Subject: python libpcap equivalent
Message-ID: <4988AD5A.1030706@dreams.sk>

Hello

I need to write a software router [yes, software equivalent to a 
hardware box that is routing packets .)]. It's a school
work..
Question is: is possible write this kind of application in python? and 
if it's, what module should i use?
I tried search for some libpcap equivalent in python and found 
pylibpcap, but can't find documentation and tutorial.



From dunmer at dreams.sk  Tue Feb  3 15:47:22 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 21:47:22 +0100
Subject: python libpcap equivalent
Message-ID: <4988AD5A.1030706@dreams.sk>

Hello

I need to write a software router [yes, software equivalent to a 
hardware box that is routing packets .)]. It's a school
work..
Question is: is possible write this kind of application in python? and 
if it's, what module should i use?
I tried search for some libpcap equivalent in python and found 
pylibpcap, but can't find documentation and tutorial.


From steve at holdenweb.com  Tue Feb  3 15:53:00 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 15:53:00 -0500
Subject: English-like Python
In-Reply-To: <1233691277.9141.6.camel@aalcdl07.lib.unc.edu>
References: <1232067775.15931.25.camel@localhost>	<mailman.7483.1232288138.3487.python-list@python.org>	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com>	<mailman.7631.1232477957.3487.python-list@python.org>	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au>	<mailman.7687.1232551157.3487.python-list@python.org>	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au>	<497899D0.5030706@strout.net>	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu>	<498863CF.7010402@strout.net>
	<1233691277.9141.6.camel@aalcdl07.lib.unc.edu>
Message-ID: <gmaarh$9qv$1@ger.gmane.org>

J. Cliff Dyer wrote:
> On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
>> J. Cliff Dyer wrote:
>>
>>> But what if your language allows functions to be used as first class
>>> objects?  (Mine does :))  
>>>
>>> x = Beep
>>>
>>> Does that assign the name x to the Beep object or does it assign the
>>> result of a Beep call to x?
>> It assigns the result.  To assign the name to the Beep object requires a 
>> bit of additional syntax; in RB, this would be
>>
>>   x = AddressOf Beep
>>
>>> There's no virtue in making ridiculously simple things even simpler if
>>> it makes the interesting things impossible.
>> Of course.  The goal is (or should be) to make the common things 
>> ridiculously simple, and make the uncommon things only somewhat less so. 
>>   Even in Python, it is far more common to invoke a function than to 
>> need a reference to it.  So invoking a function should be the thing that 
>> requires no extra syntax (even including "()").  Getting a reference to 
>> it, which is less common, should be the thing that requires more syntax.
>>
> 
> Except that now you have introduced an inconsistency into python.  What
> does the following mean?
> 
> my_object = MyObject()
> x = my_object
> 
> What if MyObject defines a method named __call__?
> 
> Now some objects are passed around using
> 
> x = my_object
> 
> while others require
> 
> x = AddressOf my_object
> 
> and the only way to tell which is which is to check the object for the
> presence of a __call__ method.  
> 
> This seems like a serious inconsistency to me.
> 
Time for my annual comment on the apparent requirement for DWIM-mode Python.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Tue Feb  3 15:57:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 18:57:29 -0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
Message-ID: <op.uosm53ydx6zn5v@gabriel2.softlabbsas.com.ar>

En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com>  
escribi?:

> Suppose a library developer (or a module developer on a large team)
> uses leading underscores. Now suppose that, for whatever reason
> (pressure from the users, perhaps), the library developer decides to
> change a "private" attribute to public. Now all occurrences of the
> identifier need to be changed. If an assignment to the previously
> "private" attribute is missed, no warning will be issued (because
> Python allows new attributes to be added anywhere, even completely
> outside the class definition itself). And if the library is widely
> used, the probability of such bugs occurring is very high.

So _foo becomes foo. Then:

class X(object):
     def get_foo(self): return self._foo
     def set_foo(self, value): self._foo = value
     foo = property(get_foo, set_foo)

You have the public name "foo", for new usage outside the library, and the  
private name "_foo", for internal use only. And we're all happy. If it  
weren't for your "historical" reasons, using those trivial get/set  
functions is rather silly.

-- 
Gabriel Genellina



From imageguy1206 at gmail.com  Tue Feb  3 16:01:53 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Tue, 3 Feb 2009 13:01:53 -0800 (PST)
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
References: <mailman.8719.1233689579.3487.python-list@python.org>
Message-ID: <ee94f6fd-9fb0-4c7b-99db-1258a32efcb0@x16g2000prn.googlegroups.com>

On Feb 3, 2:32?pm, Laszlo Nagy <gand... at shopzeus.com> wrote:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
>
> My problem:
>
> ? ? * python 2.6 already installed on a server
> ? ? * there is a firebird 1.5 database on the same server
> ? ? * I need to access it from python 2.6
>
> Any thoughts?

Have you asked on the Firebird list ?
The original maintainer of kinterbasedb passed away and maintenance
was taken over by the Firebird project.  See this link.
http://www.firebirdsql.org/index.php?op=devel&sub=python

Sorry, but that is the best I can do.

g.



From http  Tue Feb  3 16:05:01 2009
From: http (Paul Rubin)
Date: 03 Feb 2009 13:05:01 -0800
Subject: x64 speed
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <7xy6wn1bb6.fsf@ruckus.brouhaha.com>

Robin Becker <robin at reportlab.com> writes:
> so it looks like the vmware emulated system is much faster. Is it the
> x64 working faster at its design sizes or perhaps the compiler or
> could it be the vmware system caching all writes etc etc? For the red
> hat x64 build the only special configuration was to use ucs2

You have to control all these variables separately in order to know.
But, 64 bit code is in general faster than 32 bit code when properly
compiled: more cpu registers, wider moves when copying large blocks of
data, floating point registers instead of the legacy stack-oriented
FPU, etc.


From robin at NOSPAMreportlab.com  Tue Feb  3 16:20:23 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:20:23 +0000
Subject: x64 speed
In-Reply-To: <6urnm4Fgv092U1@mid.uni-berlin.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<6urnm4Fgv092U1@mid.uni-berlin.de>
Message-ID: <4988B517.1090108@jessikat.plus.net>

Diez B. Roggisch wrote:
> Robin Becker schrieb:
>> Whilst doing some portability testing with reportlab I noticed a 
>> strange speedup for our unittest suite with python2.5
>>
>> host  win32 xp3 unittest time=42.2 seconds
>> vmware RHEL x64 unittest time=30.9 seconds
>>
>> so it looks like the vmware emulated system is much faster. Is it the 
>> x64 working faster at its design sizes or perhaps the compiler or 
>> could it be the vmware system caching all writes etc etc? For the red 
>> hat x64 build the only special configuration was to use ucs2
>>
>> I know that the VT bit stuff has made virtualization much better, but 
>> this seems a bit weird.
> 
> 
> AFAIK some VMs have difficulties with timers. For example, my 
> virtualized KDE has that jumping icon when starting a program - and 
> that's *much* faster jumping inside VBox :)
> 
......
> Diez
I started both in terminals and the host never wins :)

-- 
Robin Becker


From robin at NOSPAMreportlab.com  Tue Feb  3 16:21:47 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:21:47 +0000
Subject: x64 speed
In-Reply-To: <7xy6wn1bb6.fsf@ruckus.brouhaha.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<7xy6wn1bb6.fsf@ruckus.brouhaha.com>
Message-ID: <4988B56B.9040203@jessikat.plus.net>

Paul Rubin wrote:
> Robin Becker <robin at reportlab.com> writes:
>> so it looks like the vmware emulated system is much faster. Is it the
>> x64 working faster at its design sizes or perhaps the compiler or
>> could it be the vmware system caching all writes etc etc? For the red
>> hat x64 build the only special configuration was to use ucs2
> 
> You have to control all these variables separately in order to know.
> But, 64 bit code is in general faster than 32 bit code when properly
> compiled: more cpu registers, wider moves when copying large blocks of
> data, floating point registers instead of the legacy stack-oriented
> FPU, etc.

I tried looking at the cpu usage whilst running these and by eye it 
seemed that the host system was running more parallel stuff than the 
vmware vm.
-- 
Robin Becker


From robin at NOSPAMreportlab.com  Tue Feb  3 16:22:13 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:22:13 +0000
Subject: x64 speed
In-Reply-To: <ikcm56-lmq.ln1@ozzie.tundraware.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<ikcm56-lmq.ln1@ozzie.tundraware.com>
Message-ID: <4988B585.5080909@jessikat.plus.net>

Tim Daneliuk wrote:
......
> 
> Which vmware product?
> 

vmware server
-- 
Robin Becker


From sevillad at gmail.com  Tue Feb  3 16:24:17 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 13:24:17 -0800 (PST)
Subject: Locating python
Message-ID: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>

Hi,

Apologies if this was answered somewhere else, I have not found
anything similar anywhere.

I have SUSE 11.0 and I am trying to install a program called
mnemosyne. I need easy_install for this, for which I installed
setuptools through yast2. But when I run easy_install for the final
installation, I get an error like this:

[...]
[Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
packages/test-easy-install-3728.pth'

The installation directory you specified (via --install-dir, --prefix,
or the distutils default setting) was:

    /usr/local/lib/python2.5/site-packages/

This directory does not currently exist. [...]

>From what I have gathered by reading here and there, it seems that the
actual path for site-packages is not the place where it is being
looked for. Sure enough, I have /usr/local/lib/python2.5/site-
packages/ . What worries me is that there is no file called test*
there, and I am not even able to find the site.py file mentioned in
site-packages/README. I suspect that I have two concurrent
installations or something like that (I do have python and python2.5
inside /usr/lib). How do I untangle this? Or at least how do I get
easy_install to find the right place?

Thanks a lot,

David


From robin at NOSPAMreportlab.com  Tue Feb  3 16:24:37 2009
From: robin at NOSPAMreportlab.com (Robin Becker)
Date: Tue, 03 Feb 2009 21:24:37 +0000
Subject: x64 speed
In-Reply-To: <4988a1f1$0$3390$9b622d9e@news.freenet.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
Message-ID: <4988B615.4060206@jessikat.plus.net>

Martin v. L?wis wrote:
.....
> I follow David's guess that Linux does better IO than Windows (not
> knowing anything about the benchmark, of course)
> 
> Regards,
> Martin

I originally thought it must be the vmware host stuff offloading IO to 
the second core, but watching with sysinternals didn't show a lot of 
extra stuff going on with the vm compared to just running on the host.
-- 
Robin Becker


From gagsl-py2 at yahoo.com.ar  Tue Feb  3 16:42:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 03 Feb 2009 19:42:02 -0200
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
	<49886C78.5020406@mrabarnett.plus.com> <gma2al$a5p$1@ger.gmane.org>
	<775033410902031110m2437f858n4affa3a0a92dd90a@mail.gmail.com>
Message-ID: <op.uoso8cmfx6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 03 Feb 2009 17:10:18 -0200, er <erobererunc at gmail.com> escribi?:

> It might be nice if Python could provide a global dictionary, perhaps  
> _G{},
> where you can throw things.  This is actually the solution provided by  
> the
> Lua scripting language.  Thanks for the global_ module solution, I was  
> just
> making sure that was the canonical way.

You *could* do that now, just inject a dictionary into the builtin module.  
sitecustomize.py would be the place to do that (it's executed before the  
main script).

	import __builtin__
	__builtin__.globalvars = {}

Then you can use globalvars[...] everywhere. But your code won't run in  
other locations, nor can you distribute it, you'll have to repeat the same  
steps when you upgrade your Python version, and people will wonder *where*  
such variable name comes from...

Too much trouble, only to avoid typing a single line:

	from config import globalvars

and it doesn't have any of the drawbacks listed above. I'd use import.

-- 
Gabriel Genellina



From martin at v.loewis.de  Tue Feb  3 16:45:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 03 Feb 2009 22:45:12 +0100
Subject: x64 speed
In-Reply-To: <4988B615.4060206@jessikat.plus.net>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
	<4988B615.4060206@jessikat.plus.net>
Message-ID: <4988BAE8.2060204@v.loewis.de>

>> I follow David's guess that Linux does better IO than Windows (not
>> knowing anything about the benchmark, of course)
>>
> I originally thought it must be the vmware host stuff offloading IO to
> the second core, but watching with sysinternals didn't show a lot of
> extra stuff going on with the vm compared to just running on the host.

I'm not talking about vmware. I'm suggesting that Linux ext3, and the
Linux buffer handling, is just more efficient than NTFS, and the Windows
buffer handling.

If you split the total runtime into system time and user time, how do
the 30s split up?

Regards,
Martin


From aahz at pythoncraft.com  Tue Feb  3 16:53:39 2009
From: aahz at pythoncraft.com (Aahz)
Date: 3 Feb 2009 13:53:39 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <gmaed3$c2j$1@panix3.panix.com>

In article <hV%hl.29854$Sp5.19680 at text.news.virginmedia.com>,
Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>> 
>>> real programmers use ed.
>> 
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>
>You had teeth!?!
>
>Oh and hi, I shall be a new face in the crowd ;)

Welcome!  Looks like you'll fit right ni.

(Yes, that's a typo but it's such a lovely one...)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From castironpi at gmail.com  Tue Feb  3 16:59:53 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 3 Feb 2009 13:59:53 -0800 (PST)
Subject: English-like Python
References: <1232067775.15931.25.camel@localhost>
	<mailman.7483.1232288138.3487.python-list@python.org> 
	<8436acc6-953f-4fa5-a894-123de4254a25@r15g2000prh.googlegroups.com> 
	<mailman.7631.1232477957.3487.python-list@python.org>
	<pan.2009.01.21.08.36.48@REMOVE.THIS.cybersource.com.au> 
	<mailman.7687.1232551157.3487.python-list@python.org>
	<pan.2009.01.22.08.17.16@REMOVE.THIS.cybersource.com.au> 
	<497899D0.5030706@strout.net>
	<1233672856.7189.7.camel@aalcdl07.lib.unc.edu> 
	<498863CF.7010402@strout.net>
	<mailman.8721.1233691289.3487.python-list@python.org>
Message-ID: <356f70e4-abd6-4fdd-9c4c-c802fbb4f67b@r41g2000prr.googlegroups.com>

On Feb 3, 2:01?pm, "J. Cliff Dyer" <j... at sdf.lonestar.org> wrote:
> On Tue, 2009-02-03 at 08:33 -0700, Joe Strout wrote:
> > J. Cliff Dyer wrote:
>
> > > But what if your language allows functions to be used as first class
> > > objects? ?(Mine does :)) ?
>
> > > x = Beep
>
> > > Does that assign the name x to the Beep object or does it assign the
> > > result of a Beep call to x?
>
> > It assigns the result. ?To assign the name to the Beep object requires a
> > bit of additional syntax; in RB, this would be
>
> > ? x = AddressOf Beep
>
> > > There's no virtue in making ridiculously simple things even simpler if
> > > it makes the interesting things impossible.
>
> > Of course. ?The goal is (or should be) to make the common things
> > ridiculously simple, and make the uncommon things only somewhat less so.
> > ? Even in Python, it is far more common to invoke a function than to
> > need a reference to it. ?So invoking a function should be the thing that
> > requires no extra syntax (even including "()"). ?Getting a reference to
> > it, which is less common, should be the thing that requires more syntax.
>
> Except that now you have introduced an inconsistency into python. ?What
> does the following mean?
>
> my_object = MyObject()
> x = my_object
>
> What if MyObject defines a method named __call__?
>
> Now some objects are passed around using
>
> x = my_object
>
> while others require
>
> x = AddressOf my_object
>
> and the only way to tell which is which is to check the object for the
> presence of a __call__ method. ?
>
> This seems like a serious inconsistency to me.
>
> > Cheers,
> > - Joe
>
> Cliff

Well, just return to the natural language we're trying to model.

x= going to the store
x= go to the store

Imperatives don't usually return values.

x= the process of going to the store
x= the result of going to the store

I'm starting to think that PLs and NLs are quite dissimilar.  What do
return values are denoting phrases:

x= the man in the corner
x= the man in the corner talking to the woman

Once you've established the subject, you usually make declarations
about him/er/it.

was_at_the_mall_today( x )
talked_to_me_earlier( x )

Usually you expect your audience to have reasoning capacities, and
giving them declarative knowledge is preemptive to the need to give
them orders later on.

Ideally, interactions could take place entirely in the declarative:
introduce yourself and wait-style.


From piers at it.usyd.edu.au  Tue Feb  3 17:07:06 2009
From: piers at it.usyd.edu.au (Piers Lauder)
Date: Wed, 04 Feb 2009 09:07:06 +1100
Subject: imaplib thread method anomaly
References: <113545.23852.qm@web54507.mail.re2.yahoo.com>
Message-ID: <1233698829.49.72156511@it.usyd.edu.au>

On Tue, 3 Feb 2009 05:22:01 -0800 (PST), Mr SZ wrote:
  > 
  > I was looking at the thread functionality of IMAP4rev1 servers with the
  > threading extension. Here is my output with debug=8 :
  > 
  > 
  > 
  >   02:23.02 > GDJB3 UID THREAD references UTF-8 (SEEN)
  >   02:23.02 < * THREAD (3)(2)(4)(1)
  >   02:23.02 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  >   02:23.03 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  >   02:23.03 < GDJB3 OK Thread completed.
  >   02:23.03 	matched r'(?P<tag>GDJB\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('GDJB3', 'OK', 'Thread completed.')
  > [None]
  > 
  > ...
  > 
  > 
  >   02:59.22 > CNCF3 THREAD references UTF-8 (SEEN)
  >   02:59.23 < * THREAD (3)(2)(4)(1)
  >   02:59.23 	matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => ('THREAD', ' (3)(2)(4)(1)', '(3)(2)(4)(1)')
  >   02:59.23 untagged_responses[THREAD] 0 += ["(3)(2)(4)(1)"]
  >   02:59.23 < CNCF3 OK Thread completed.
  >   02:59.23 	matched r'(?P<tag>CNCF\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('CNCF3', 'OK', 'Thread completed.')
  >   02:59.23 untagged_responses[THREAD] => ['(3)(2)(4)(1)']
  > ['(3)(2)(4)(1)']
  > 
  > 
  > As you can see, the first is a UID command and the second is calling the
  > thread method. Also, the server responses are the same for both. So why is
  > one returning None and the other returning the correct response? I'm using
  > python2.4 and I'm stuck with it as I'm using it in a zope environment.

In one of life's weird coincidences - someone else just created
bugs.python.org issue5146 on this.

The fix is a change in the method 'uid' to read:

	...
        if command in ('SEARCH', 'SORT', 'THREAD'):
            name = command
        else:
            name = 'FETCH'
	...


(Thanks to <abhishek at synovel.com>)

Piers Lauder





From lists at cheimes.de  Tue Feb  3 17:19:26 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:19:26 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <49889BE3.7030206@shopzeus.com>
References: <49889BE3.7030206@shopzeus.com>
Message-ID: <gmaftf$rnn$1@ger.gmane.org>

Laszlo Nagy schrieb:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
> 
> My problem:
> 
>    * python 2.6 already installed on a server
>    * there is a firebird 1.5 database on the same server
>    * I need to access it from python 2.6
> 
> Any thoughts?

kinterbasdb 3.2.2 and 3.3.0 are working perfectly fine with Python 2.6.
You can install it in less than 2 minutes with the usual tar -xzf &&
python2.6 setup.py install dance. I don't know if the latest versions of
kinterbasdb still support 1.5.

Christian



From simon at brunningonline.net  Tue Feb  3 17:20:44 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 3 Feb 2009 22:20:44 +0000
Subject: JDBC in CPYTHON
In-Reply-To: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
Message-ID: <8c7f10c60902031420y1cc5647flcbde2aedd9e66c92@mail.gmail.com>

2009/2/3 KMCB <kmcbrearty at yahoo.com>:
> I was wondering if anyone was aware of a JDBC DBAPI module for
> cpython.  I have looked at PYJDBC and was interested in avoiding using
> that extra level of ICE.  I was thinking maybe someone would have back
> ported zxJDBC from Jython.  Or used that as a starting point, to
> create a module and had a C based wrapper for the driver.  This type
> of activity was talked about back in 2004 on this forum, but I was
> wondering if anyone had newer information.

I don't know if <http://jpype.sourceforge.net/> or
<http://www.boddie.org.uk/python/javaclass.html> might be of help.

-- 
Cheers,
Simon B.


From kyosohma at gmail.com  Tue Feb  3 17:24:48 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 3 Feb 2009 14:24:48 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
Message-ID: <c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>

On Feb 3, 3:24?pm, David Sevilla <sevil... at gmail.com> wrote:
> Hi,
>
> Apologies if this was answered somewhere else, I have not found
> anything similar anywhere.
>
> I have SUSE 11.0 and I am trying to install a program called
> mnemosyne. I need easy_install for this, for which I installed
> setuptools through yast2. But when I run easy_install for the final
> installation, I get an error like this:
>
> [...]
> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> packages/test-easy-install-3728.pth'
>
> The installation directory you specified (via --install-dir, --prefix,
> or the distutils default setting) was:
>
> ? ? /usr/local/lib/python2.5/site-packages/
>
> This directory does not currently exist. [...]
>
> From what I have gathered by reading here and there, it seems that the
> actual path for site-packages is not the place where it is being
> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> packages/ . What worries me is that there is no file called test*
> there, and I am not even able to find the site.py file mentioned in
> site-packages/README. I suspect that I have two concurrent
> installations or something like that (I do have python and python2.5
> inside /usr/lib). How do I untangle this? Or at least how do I get
> easy_install to find the right place?
>
> Thanks a lot,
>
> David

I would get setuptools from the official source:

http://peak.telecommunity.com/DevCenter/setuptools
http://pypi.python.org/pypi/setuptools

Install it using the python of your choice. You may have to pass a
full path to the python "binary" to make sure you're using the right
one. So, after downloading and decompressing the setuptools package,
change directory into it. Then run something like this:

/path/to/python setup.py install

I think that will work...of course, your mileage may vary. I haven't
used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
You might be able to just use that too..

Mike


From steve at holdenweb.com  Tue Feb  3 17:27:47 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:27:47 -0500
Subject: Reading text file with wierd file extension?
In-Reply-To: <3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>
References: <e837544c-ea00-4e0e-8bdd-4ec5ba6e8dac@i24g2000prf.googlegroups.com>	<887b7e96-b0cc-4dea-8c1a-76c60ebffad3@t26g2000prh.googlegroups.com>
	<fb1c0df5-90f0-4af6-8719-fbe4a17d4635@l33g2000pri.googlegroups.com>
	<1e517f65-816e-4317-bb8c-0d9ee06041dd@r15g2000prd.googlegroups.com>
	<c14a868c-81d4-4917-9e33-62d27d876ceb@w1g2000prk.googlegroups.com>
	<6up5kbFglf13U1@mid.uni-berlin.de>
	<3577795b-f031-400e-bb82-693ef2b3e639@q30g2000prq.googlegroups.com>
Message-ID: <gmagd5$ski$1@ger.gmane.org>

John Machin wrote:
> On Feb 3, 8:07 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> 
>> This is written very slowly, so you can read it better:
>>
>> Please post the traceback.
> 
> *AND* please post the text of the IOError message
> 
> *AND* please do yourself a favour and move your files out of the root
> directory into a directory with a meaningful name

*AND* please don't take offense, as all this gratuitous advice is meant
to allow us to better help you!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Tue Feb  3 17:30:26 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:30:26 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
Message-ID: <3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>


the exact details of what you are reporting seem a bit odd, but i have
seen a similar error because i have tried to use my own account to
install the package, instead of using root.

what i believe happens is that easy_install first tries to create the
"test" file, and then checks it is there.  if it is not there, you get
an error.  normally the error explains that you need to run as root,
but i assume in your case it doesn't - that seems odd, but it seemed
worth mentioning anyway.

so if you have not done so, instead of

  python setup.py install

do

  sudo python setup.py install

more generally, i have used opensuse 11.0 and 11.1, and generally
things work just fine, so i would check you are following all the
instructions correctly.

good luck,
andrew

On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
> [...]
> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> packages/test-easy-install-3728.pth'
>
> The installation directory you specified (via --install-dir, --prefix,
> or the distutils default setting) was:
>
> ? ? /usr/local/lib/python2.5/site-packages/
>
> This directory does not currently exist. [...]
>
> From what I have gathered by reading here and there, it seems that the
> actual path for site-packages is not the place where it is being
> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> packages/ . What worries me is that there is no file called test*


From invalid at invalid  Tue Feb  3 17:30:34 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 03 Feb 2009 16:30:34 -0600
Subject: python libpcap equivalent
References: <mailman.8726.1233694063.3487.python-list@python.org>
Message-ID: <m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>

On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:

> I need to write a software router [yes, software equivalent to
> hardware box that is routing packets .)]. It's a school work..

> Question is: is possible write this kind of application in
> python?

Hmm.  It's going to be rather difficult, but you might be able
to.

> and if it's, what module should i use? I tried search for some
> libpcap equivalent in python and found pylibpcap, but can't
> find documentation and tutorial.

You can use pylibpcap to capture packets, and then use a raw
socket to send them out again on whatever interface you want.
You'll have to make sure that the host's OS's network stack
isn't going to process the packets at all.  I'm not sure how
you go about that.

The documentation for pylibpcap is built into the module. See
doc.i in the tarball.


-- 
Grant Edwards                   grante             Yow! I'd like some JUNK
                                  at               FOOD ... and then I want to
                               visi.com            be ALONE --


From sevillad at gmail.com  Tue Feb  3 17:34:07 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 14:34:07 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
Message-ID: <3c83a573-3170-4cf1-9b2d-88e4b639f9a1@p2g2000prf.googlegroups.com>

On Feb 3, 11:24?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 3, 3:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > Apologies if this was answered somewhere else, I have not found
> > anything similar anywhere.
>
> > I have SUSE 11.0 and I am trying to install a program called
> > mnemosyne. I need easy_install for this, for which I installed
> > setuptools through yast2. But when I run easy_install for the final
> > installation, I get an error like this:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
> > there, and I am not even able to find the site.py file mentioned in
> > site-packages/README. I suspect that I have two concurrent
> > installations or something like that (I do have python and python2.5
> > inside /usr/lib). How do I untangle this? Or at least how do I get
> > easy_install to find the right place?
>
> > Thanks a lot,
>
> > David
>
> I would get setuptools from the official source:
>
> http://peak.telecommunity.com/DevCenter/setuptoolshttp://pypi.python.org/pypi/setuptools
>
> Install it using the python of your choice. You may have to pass a
> full path to the python "binary" to make sure you're using the right
> one. So, after downloading and decompressing the setuptools package,
> change directory into it. Then run something like this:
>
> /path/to/python setup.py install
>
> I think that will work...of course, your mileage may vary. I haven't
> used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
> You might be able to just use that too..
>
> Mike

Actually, a manual installation is probably the best thing to do,
since I did use the SUSE package manager (yast2) to install setuptools
and never had a chance to choose installation paths.

Thanks,

David


From sevillad at gmail.com  Tue Feb  3 17:35:31 2009
From: sevillad at gmail.com (David Sevilla)
Date: Tue, 3 Feb 2009 14:35:31 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
Message-ID: <6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>

On Feb 3, 11:30?pm, andrew cooke <and... at acooke.org> wrote:
> the exact details of what you are reporting seem a bit odd, but i have
> seen a similar error because i have tried to use my own account to
> install the package, instead of using root.
>
> what i believe happens is that easy_install first tries to create the
> "test" file, and then checks it is there. ?if it is not there, you get
> an error. ?normally the error explains that you need to run as root,
> but i assume in your case it doesn't - that seems odd, but it seemed
> worth mentioning anyway.
>
> so if you have not done so, instead of
>
> ? python setup.py install
>
> do
>
> ? sudo python setup.py install
>
> more generally, i have used opensuse 11.0 and 11.1, and generally
> things work just fine, so i would check you are following all the
> instructions correctly.
>
> good luck,
> andrew
>
> On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
>
>

I am quite new to Linux, and thought that by using yast2 there would
be no user problems (I am asked for the root password). I will sudo it
to see if it solves the problem.

Thanks,

David


From andrew at acooke.org  Tue Feb  3 17:36:36 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:36:36 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
Message-ID: <df45ffa9-6796-4984-a718-bb520ad944de@v13g2000vbb.googlegroups.com>


sorry, you are using easy_install, so

  sudo easy_install ....

instead of what i said a moment ago.  the important thing is to use
"sudo".

andrew

On Feb 3, 7:30?pm, andrew cooke <and... at acooke.org> wrote:
> the exact details of what you are reporting seem a bit odd, but i have
> seen a similar error because i have tried to use my own account to
> install the package, instead of using root.
>
> what i believe happens is that easy_install first tries to create the
> "test" file, and then checks it is there. ?if it is not there, you get
> an error. ?normally the error explains that you need to run as root,
> but i assume in your case it doesn't - that seems odd, but it seemed
> worth mentioning anyway.
>
> so if you have not done so, instead of
>
> ? python setup.py install
>
> do
>
> ? sudo python setup.py install
>
> more generally, i have used opensuse 11.0 and 11.1, and generally
> things work just fine, so i would check you are following all the
> instructions correctly.
>
> good luck,
> andrew
>
> On Feb 3, 6:24?pm, David Sevilla <sevil... at gmail.com> wrote:
>
> > [...]
> > [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
> > packages/test-easy-install-3728.pth'
>
> > The installation directory you specified (via --install-dir, --prefix,
> > or the distutils default setting) was:
>
> > ? ? /usr/local/lib/python2.5/site-packages/
>
> > This directory does not currently exist. [...]
>
> > From what I have gathered by reading here and there, it seems that the
> > actual path for site-packages is not the place where it is being
> > looked for. Sure enough, I have /usr/local/lib/python2.5/site-
> > packages/ . What worries me is that there is no file called test*
>
>



From steve at holdenweb.com  Tue Feb  3 17:38:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:38:02 -0500
Subject: python libpcap equivalent
In-Reply-To: <m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
References: <mailman.8726.1233694063.3487.python-list@python.org>
	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
Message-ID: <gmah0b$v5n$1@ger.gmane.org>

Unknown wrote:
> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
> 
>> I need to write a software router [yes, software equivalent to
>> hardware box that is routing packets .)]. It's a school work..
> 
>> Question is: is possible write this kind of application in
>> python?
> 
> Hmm.  It's going to be rather difficult, but you might be able
> to.
> 
>> and if it's, what module should i use? I tried search for some
>> libpcap equivalent in python and found pylibpcap, but can't
>> find documentation and tutorial.
> 
> You can use pylibpcap to capture packets, and then use a raw
> socket to send them out again on whatever interface you want.
> You'll have to make sure that the host's OS's network stack
> isn't going to process the packets at all.  I'm not sure how
> you go about that.
> 
> The documentation for pylibpcap is built into the module. See
> doc.i in the tarball.
> 
> 
And note that this won't work on Vista, where the raw socket interface
is no longer available to standard applications.

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb  3 17:41:01 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 03 Feb 2009 17:41:01 -0500
Subject: Locating python
In-Reply-To: <c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<c27d4051-08c6-4144-a57d-8e9093330d06@v18g2000pro.googlegroups.com>
Message-ID: <gmah5v$v5n$2@ger.gmane.org>

Mike Driscoll wrote:
> On Feb 3, 3:24 pm, David Sevilla <sevil... at gmail.com> wrote:
>> Hi,
>>
>> Apologies if this was answered somewhere else, I have not found
>> anything similar anywhere.
>>
>> I have SUSE 11.0 and I am trying to install a program called
>> mnemosyne. I need easy_install for this, for which I installed
>> setuptools through yast2. But when I run easy_install for the final
>> installation, I get an error like this:
>>
>> [...]
>> [Errno 2] No such file or directory: '/usr/local/lib/python2.5/site-
>> packages/test-easy-install-3728.pth'
>>
>> The installation directory you specified (via --install-dir, --prefix,
>> or the distutils default setting) was:
>>
>>     /usr/local/lib/python2.5/site-packages/
>>
>> This directory does not currently exist. [...]
>>
>> From what I have gathered by reading here and there, it seems that the
>> actual path for site-packages is not the place where it is being
>> looked for. Sure enough, I have /usr/local/lib/python2.5/site-
>> packages/ . What worries me is that there is no file called test*
>> there, and I am not even able to find the site.py file mentioned in
>> site-packages/README. I suspect that I have two concurrent
>> installations or something like that (I do have python and python2.5
>> inside /usr/lib). How do I untangle this? Or at least how do I get
>> easy_install to find the right place?
>>
>> Thanks a lot,
>>
>> David
> 
> I would get setuptools from the official source:
> 
> http://peak.telecommunity.com/DevCenter/setuptools
> http://pypi.python.org/pypi/setuptools
> 
> Install it using the python of your choice. You may have to pass a
> full path to the python "binary" to make sure you're using the right
> one. So, after downloading and decompressing the setuptools package,
> change directory into it. Then run something like this:
> 
> /path/to/python setup.py install
> 
> I think that will work...of course, your mileage may vary. I haven't
> used SUSE. Doesn't SUSE have a package manager like Ubuntu's apt-get?
> You might be able to just use that too..

Easier still:

wget http://peak.telecommunity.com/dist/ez_setup.py
/path/to/python ez_setup.py
rm ez_setup.py

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Tue Feb  3 17:42:02 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:42:02 +0100
Subject: Cross platform compilation?
In-Reply-To: <gm8buh+ofl4@eGroups.com>
References: <gm8buh+ofl4@eGroups.com>
Message-ID: <gmah7q$v66$1@ger.gmane.org>

John Harper schrieb:
> I am trying to build Python to use in an embedded system which uses a 
> ppc_440 CPU. The only information I've found is something written by 
> Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
> seem to have successfully built Python itself, but building the 
> extensions fails miserably with complaints about library format. It 
> insists on referring to "i686" which is indeed the platform it is 
> actually running on.
> 
> Before I try to reverse engineer completely setup.py, is there 
> something obvious that needs to be done to get it to use the right tool 
> chain?
> 
> More generally, it seems like this would be something that lots of 
> people would want to do. I'm surprised there isn't support for it built 
> into the distributed version of Python, without having to hack all the 
> setup files...?

I'm sorry to inform you that Python doesn't support cross platform
compilation. Python eats its own dog food and uses Python to compile
optional extension modules.
Some guys were working on a patch. You may find something in the bug
tracker at http://bugs.python.org

Christian



From spammers at rot.in.hell  Tue Feb  3 17:46:21 2009
From: spammers at rot.in.hell (Eddie Watson)
Date: Tue, 3 Feb 2009 22:46:21 +0000 (UTC)
Subject: function call overhead
Message-ID: <ln6v6lu2nb.fsf@nuthaus.mib.org>

What's the Python function call overhead like?

Eddie Watson
"CLC plonkers in a state of panic!!!"


From andrew at acooke.org  Tue Feb  3 17:47:40 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 3 Feb 2009 14:47:40 -0800 (PST)
Subject: parse date/time from a log entry with only strftime (and no 
	regexen)
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com> 
	<mailman.8702.1233679732.3487.python-list@python.org>
Message-ID: <7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>

> > ValueError: unconverted data remains: ?this is the remainder of the log ?
> > line
> > that I do not care about

you could catch the ValueError and split at the ':' in the .args
attribute to find the extra data.  you could then find the extra data
in the original string, use the index to remove it, and re-parse the
time.

ugly, but should work.
andrew


From lists at cheimes.de  Tue Feb  3 17:54:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 03 Feb 2009 23:54:32 +0100
Subject: function call overhead
In-Reply-To: <ln6v6lu2nb.fsf@nuthaus.mib.org>
References: <ln6v6lu2nb.fsf@nuthaus.mib.org>
Message-ID: <gmahv8$2an$1@ger.gmane.org>

Eddie Watson schrieb:
> What's the Python function call overhead like?

Like 6, maybe 7

*scnr*



From dunmer at dreams.sk  Tue Feb  3 17:55:04 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 23:55:04 +0100
Subject: python libpcap equivalent
In-Reply-To: <gmah0b$v5n$1@ger.gmane.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<gmah0b$v5n$1@ger.gmane.org>
Message-ID: <4988CB48.9000304@dreams.sk>

Steve Holden wrote:
> Unknown wrote:
>> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
>>
>>> I need to write a software router [yes, software equivalent to
>>> hardware box that is routing packets .)]. It's a school work..
>>> Question is: is possible write this kind of application in
>>> python?
>> Hmm.  It's going to be rather difficult, but you might be able
>> to.
>>
>>> and if it's, what module should i use? I tried search for some
>>> libpcap equivalent in python and found pylibpcap, but can't
>>> find documentation and tutorial.
>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.
>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>>
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>>
>>
> And note that this won't work on Vista, where the raw socket interface
> is no longer available to standard applications.
> 
> regards
>  Steve
> 


Thanks guys

I don't care about Vista. What i will (i hope only) need is a linux
system with two net devices running router,
XP hosts connected (not only two.. hubs, switches) and these hosts have
to ping via router.



From dunmer at dreams.sk  Tue Feb  3 17:57:02 2009
From: dunmer at dreams.sk (Gabriel)
Date: Tue, 03 Feb 2009 23:57:02 +0100
Subject: python libpcap equivalent
In-Reply-To: <gmah0b$v5n$1@ger.gmane.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<gmah0b$v5n$1@ger.gmane.org>
Message-ID: <4988CBBE.7000408@dreams.sk>

Steve Holden wrote:
> Unknown wrote:
>> On 2009-02-03, Gabriel <dunmer at dreams.sk> wrote:
>>
>>> I need to write a software router [yes, software equivalent to
>>> hardware box that is routing packets .)]. It's a school work..
>>> Question is: is possible write this kind of application in
>>> python?
>> Hmm.  It's going to be rather difficult, but you might be able
>> to.
>>
>>> and if it's, what module should i use? I tried search for some
>>> libpcap equivalent in python and found pylibpcap, but can't
>>> find documentation and tutorial.
>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.
>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>>
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>>
>>
> And note that this won't work on Vista, where the raw socket interface
> is no longer available to standard applications.
> 
> regards
>  Steve
> 


Thanks guys

I don't care about Vista. What i will (i hope only) need is a linux
system with two net devices running router,
XP hosts connected (not only two.. hubs, switches) and these hosts have
to ping via router.



From Scott.Daniels at Acm.Org  Tue Feb  3 18:42:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 03 Feb 2009 15:42:21 -0800
Subject: Path question
In-Reply-To: <mailman.8716.1233686855.3487.python-list@python.org>
References: <mailman.8716.1233686855.3487.python-list@python.org>
Message-ID: <37WdnbcVOrtzSBXUnZ2dnUVZ_vninZ2d@pdx.net>

Geert Vancompernolle wrote:
> I have the following path construction: ...
> ./src/__init__.py
>     /main.py
>     /modules/__init__.py
>             /application.py
>     /ui/__init__.py
>        /mainwindow/__init__.py
>                   /mainwindow.py
> I want to call ... 'MainWindow' in module 'mainwindow', from 'application'.

> I'm having the following import statement in 'applications.py':
> from .. ui.mainwindow.mainwindow import MainWindow


If you run the application with the command:
     python -m src.modules.application ...
rather than
     python src/modules/application.py ...
your import should work.
You need to make the package layering to application explicit.
Similarly, you can start Idle with:
     python -m idlelib.idle ...

--Scott David Daniels
Scott.Daniels at Acm.Org


From rhodri at wildebst.demon.co.uk  Tue Feb  3 19:05:24 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 00:05:24 -0000
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uosvvagba8ncjz@gnudebst>

On Tue, 03 Feb 2009 08:45:23 -0000, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> wrote:

> I find this extreme position is rather incoherent. If I may paraphrase
> the argument as I see it:

> "Enforced data hiding is useless, because it is utterly trivial to bypass
> it, AND it's wicked, because it makes it unbelievably painful and
> difficult to bypass it when you need to."

> If it is trivial to bypass, surely it can't be that painful to bypass?

I think you haven't noticed which of the parties is shifting their ground.
I'm very much of the second opinion; it was Russ who did the sudden volte
face and declared that it was trivial to circumvent.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From rhodri at wildebst.demon.co.uk  Tue Feb  3 19:14:23 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 00:14:23 -0000
Subject: is python Object oriented??
In-Reply-To: <3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
Message-ID: <op.uosv99j3a8ncjz@gnudebst>

On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 2, 7:48?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com>  
>> wrote:
>> > Here we go again. If you have access to the source code (as you nearly
>> > always do with Python code), then "breaking the language-enforced data
>> > hiding" is a trivial matter of deleting the word "private" (or
>> > equivalent).
>>
>> If it's that trivial to defeat something that its proponents appear to
>> want to be close to an iron-clad guarantee, what on earth is the point
>> of using "private" in the first place?
>
> If a library developer releases the source code of a library, any user
> can trivially "defeat" the access restrictions. But if a team of
> developers is checking in code for a project, the leader(s) of the
> project can insist that the access restrictions be respected to
> simplify the management of interfaces. The larger the team, the more
> useful that can be. That's why Java, C++, Ada, Scala, and other
> languages have a "private" keyword.

Indeed he can.  He can even do that in Python; it just requires a little
self-discipline from the team, or a validation script on the code
repository if he really doesn't trust them.  Not only can this be done
without forcing the rest of the world to play, it makes things a little
less daunting when those nice clean interfaces turn out to be
incomplete/too slow/not what you thought.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From defaultuserbr at yahoo.com  Tue Feb  3 19:23:00 2009
From: defaultuserbr at yahoo.com (Default User)
Date: 4 Feb 2009 00:23:00 GMT
Subject: function call overhead
References: <ln6v6lu2nb.fsf@nuthaus.mib.org>
	<c710ceab-c6c3-4437-bdab-f95e3ac3002b@b38g2000prf.googlegroups.com>
Message-ID: <6us5f4Fh659sU1@mid.individual.net>


The original message in this thread was posted with the intent to
disrupt comp.lang.c by setting follow-ups there. Please either ignore
this thread or change the distribution. Thanks, and sorry our troll has
caused problems in your group.




Brian


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb  3 19:51:46 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 00:51:46 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<MPG.23f22ac362c6510a9897bc@news.individual.de>
Message-ID: <pan.2009.02.04.00.51.47@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 10:20:28 +0100, Thorsten Kampe wrote:


>> If a "private" keyword (or equivalent) were available, then the change
>> would need to be made in only one location rather than at every
>> occurrence off the identifier. That is much less error prone. Sure, you
>> can argue (as I'm sure someone will) that the users of the library
>> should be more careful. Yes they should, but why not let the language
>> help with such low-level details. That's what high-level languages are
>> for.
> 
> This scenario is highly "supposing" and doesn't look like a real-world-
> case to me.

You think that private attributes never become public?

Encoding a "private" flag in the name is a violation of Once And Only 
Once. Although the OAOO principle is generally referred to when 
discussing code, it is more generic and applies to other things as well. 
You should be able to state an attribute is private *once*, not every 
time you use it.

http://c2.com/cgi/wiki?OnceAndOnlyOnce

On the other hand, encoding that private flag in the name is a variation 
of *sensible* Hungarian Notation, as used by the Microsoft Apps team, not 
the stupid version used by the Windows team.

http://www.joelonsoftware.com/articles/Wrong.html

So that's a point in its favour.



> But anyway: the obvious solution in my humble opinion would
> be to do something like "public_attribute = _private_attribute". But
> that would be too simple, too "unjavaesque", right?!

No, it would be too *faulty*. It simply doesn't work. Consider:

class Parrot(object):
    _count = 0
    def foo(self):
        print 'foo'
        self._count += 1
    def bar(self):
        print "You have called foo %d times" % self._count


This works as expected:

>>> p = Parrot()
>>> p.foo()
foo
>>> p.foo()
foo
>>> p.bar()
You have called foo 2 times


Now you promote count from private to public, using your "obvious 
solution", and try to use it:


class Parrot(object):
    _count = 0
    count = _count
    def foo(self):
        print 'foo'
        self._count += 1
    def bar(self):
        print "You have called foo %d times" % self._count



>>> p = Parrot()
>>> p.foo()
foo
>>> p.count = 99
>>> p.bar()
You have called foo 1 times


Clearly the "obvious" solution simply isn't sufficient to get the result 
that you need. One solution is to just refactor the source code, so that 
the attribute identifier "_count" becomes "count", but beware of all the 
usual issues with source code refactoring.

Another solution is to leave _count as it is, and create a *property* 
called count, not a simple attribute:

count = property(
    lambda self: self._count, 
    lambda self, x: setattr(self, '_count', x),
    None,
    "Public interface to private attribute _count"
    )


but this adds complexity to the class and will be a maintenance headache 
as the class' methods diverge into those that manipulate self._count 
directly and other methods which manipulate self.count.



-- 
Steven


From demirbaris at gmail.com  Tue Feb  3 19:57:37 2009
From: demirbaris at gmail.com (Baris Demir)
Date: Wed, 04 Feb 2009 01:57:37 +0100
Subject: function scope
In-Reply-To: <0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>
References: <mailman.8654.1233618041.3487.python-list@python.org>	<cadeabbf-038f-467a-9a08-e6f4b61ce03b@41g2000yqf.googlegroups.com>
	<0vhfo4p2fsmogbjgs87jhfcbvl1ir7pi9n@4ax.com>
Message-ID: <4988E801.7050705@gmail.com>

Tim Roberts wrote:
> Mike Kent <mrmakent at cox.net> wrote:
>   
>> On Feb 2, 6:40 pm, Baris Demir <demirba... at gmail.com> wrote:
>>
>>     
>>> def simpleCut(d=dict()):
>>>        temp=d
>>>        for i in temp.keys():
>>>            if    (temp[i] == .......) :
>>>               temp[i]=new_value
>>> return temp
>>>       
>> You have been bitten by the shared default parameter noobie trap:
>> http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects
>>     
>
> Actually, he hasn't.  His problem is more fundamental.
>
> However, this is still a good thing for you to point out now and then.
>   

Thanks a lot for the replies guys. They all helped a lot. And, I guess, 
I should read a lot more about python, it is not as simple as it seems 
at the beginning, or for the beginners:)
cheers
BD



From cournape at gmail.com  Tue Feb  3 20:03:57 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 4 Feb 2009 10:03:57 +0900
Subject: is python Object oriented??
In-Reply-To: <dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<mailman.8710.1233684330.3487.python-list@python.org>
	<dddf883e-651f-4e67-947e-cf0f118b7d64@v31g2000vbb.googlegroups.com>
Message-ID: <5b8d13220902031703r15a32435j27f90fabde147e25@mail.gmail.com>

On Wed, Feb 4, 2009 at 4:10 AM,  <thmpsn.m.k at gmail.com> wrote:

>
> What limitations? The only limitations I see are the ones associated
> with opaque types (what you mentioned above).

Opaque type are used in C++ as well, for data hiding - if
private/public were that great for data hiding, the PIMPL idiom would
not be used. That's the limitation I am talking about. Granted, it is
relatively specific to C++, which use the C headers mechanism for API
declaration.

David


From Russ.Paielli at gmail.com  Tue Feb  3 20:13:32 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 17:13:32 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
Message-ID: <4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>

On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 08:45:23 -0000, Steven D'Aprano
>
> <ste... at remove.this.cybersource.com.au> wrote:
> > I find this extreme position is rather incoherent. If I may paraphrase
> > the argument as I see it:
> > "Enforced data hiding is useless, because it is utterly trivial to bypass
> > it, AND it's wicked, because it makes it unbelievably painful and
> > difficult to bypass it when you need to."
> > If it is trivial to bypass, surely it can't be that painful to bypass?
>
> I think you haven't noticed which of the parties is shifting their ground.
> I'm very much of the second opinion; it was Russ who did the sudden volte
> face and declared that it was trivial to circumvent.

Whoa! Hold on a minute here. Your failure to understand a simple idea
does not constitute a "sudden volte" (whatever that is) on my part.

Let me try to explain again what should be fairly obvious.

If the user of the library has the source code (and the right to
modify it), disabling access restrictions is trivial. You simply
delete the "private" keyword (or equivalent) wherever necessary.

If you are working with a team, however, you cannot just do that
unilaterally unless you have the authority to do so. In other words,
you may be required to conform to the APIs established by the team. In
that case, disabling access restrictions may not be impossible (or
even difficult), but it is no longer trivial.


From rdmurray at bitdance.com  Tue Feb  3 20:25:05 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 01:25:05 +0000 (UTC)
Subject: global variable confusion
References: <dadfc2bb0902022225r1505ef35g56f18bebd7d6703c@mail.gmail.com>
Message-ID: <gmaqph$psk$1@ger.gmane.org>

"Robert D.M. Smith" <robert.dm.smith at gmail.com> wrote:
> I have a question on global variables and how to use them.  I have 2 files;
> a.py & b.py
> 
> # a.py -----
> 
> myvar = { 'test' : '123' }
> 
> # -------
> # b.py -----
> 
> from a import myvar
> 
> def test():
>      a.myvar = { 'blah' : '456' }
> 
> # -----
> 
> If I *'import a*' & type *'a.myvar'* it prints 'test' & '123'.
> 
> Now, if I *'import b'* & type *'b.test()'* ... does this actually change the
> contents of myvar? It seems I have to do *'print b.myvar'* to see the change
> but really I want to just simply do* 'print myvar'*. I want to be able to
> change myvar anywhere. Please help me grasp this concept.

As someone else told you the code above won't work, because you haven't
imported the 'a' that your 'test' function references.  But let's
ignore that issue.

I'm guessing the confusion you are experiencing is arising from the 
concept of name spaces (a very powerful and ubiquitous concept in Python).
A namespace maps an identifier to a object.  A given identifier exists in
exactly one namespace, but many identifiers can refer to the same object.

When you do 'from a import myvar', you are setting the identifier 'myvar' 
_in the current model's global namespace_ to point to the same object that
'myvar' does in module a.  If, in the current module, you then do, say,
'myvar = 1', what you've done is _rebound_ the identifier 'myvar' in the
current module's global namespace to the integer 1 (an integer object).
You haven't affected anything in module 'a'.

If, on the other hand, you do 'import a', what you've done is bound the
global namespace of module 'a' (an object) to the identifier 'a' in the
current module's global namespace.  If you were to do 'a = 1' in the
current module, then you'd rebind the identifier 'a' to the integer 1.
After that a.myvar would be an error.

If, however, you say 'a.myvar = 1', what you've done is rebound the
identifier 'myvar' _in module a's global namespace_ to the integer 1.  
Anything that subsequently references a.myvar is going to get '1' as
the result.

Now, to take your brain around the final bend, think about what happens 
if one module does 'from a import myvar', and module imported later does 
'import a; a.myvar = 1'.  The first module bound its global identifier
'myvar' to the object a.myvar originally pointed to (a little dictionary
in your example above).  The second module rebinds the identifier myvar in 
module a's global namespace to the integer 1.  But that doesn't affect
the first module's global namespace.  There, the identifier 'myvar'
is still bound _to the original dictionary_.

A modification of your example should make what is going on clearer:

    ---------------------------
    # a.py
    myvar = {'test': '123'}
    ---------------------------
    # b.py
    from a import myvar
    myvar['test'] = '456'
    ---------------------------

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13)
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from a import myvar
    >>> print myvar
    {'test': '123'}
    >>> import b
    >>> print myvar
    {'test': '456'}

The difference between the above and doing 'myvar = 1' is that in the
above code the statement 'myvar['test'] = '456' modifies _the object
that myvar points to_, while 'myvar = 1' modifies _what_ myvar points to.

Study that last sentence until you understand it, and a lot of things
that happen in Python will be much clearer to you (such as what
happens when you pass arguments to a function or method!)

If what I have written doesn't make sense, feel free to ask more 
questions.

--RDM



From Russ.Paielli at gmail.com  Tue Feb  3 20:28:58 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 17:28:58 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
Message-ID: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>

On Feb 3, 4:14 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 2, 7:48 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> On Tue, 03 Feb 2009 02:16:01 -0000, Russ P. <Russ.Paie... at gmail.com>
> >> wrote:
> >> > Here we go again. If you have access to the source code (as you nearly
> >> > always do with Python code), then "breaking the language-enforced data
> >> > hiding" is a trivial matter of deleting the word "private" (or
> >> > equivalent).
>
> >> If it's that trivial to defeat something that its proponents appear to
> >> want to be close to an iron-clad guarantee, what on earth is the point
> >> of using "private" in the first place?
>
> > If a library developer releases the source code of a library, any user
> > can trivially "defeat" the access restrictions. But if a team of
> > developers is checking in code for a project, the leader(s) of the
> > project can insist that the access restrictions be respected to
> > simplify the management of interfaces. The larger the team, the more
> > useful that can be. That's why Java, C++, Ada, Scala, and other
> > languages have a "private" keyword.
>
> Indeed he can.  He can even do that in Python; it just requires a little
> self-discipline from the team, or a validation script on the code
> repository if he really doesn't trust them.  Not only can this be done
> without forcing the rest of the world to play, it makes things a little
> less daunting when those nice clean interfaces turn out to be
> incomplete/too slow/not what you thought.

This has already been refuted several times on this thread alone, so I
will not bother doing it again.



From davidgould at davidgould.com  Tue Feb  3 20:46:57 2009
From: davidgould at davidgould.com (davidgould at davidgould.com)
Date: Tue, 3 Feb 2009 17:46:57 -0800 (PST)
Subject: Passing environment variable to "subprocess" causes failure
Message-ID: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>

I'm attempting to run subprocess and passing in an environment
variable. When I do this the child process fails with an error. When I
don't pass an environement variable it runs fine.

BTW Running this code under Windows XP with Python 2.6.1

Code A:

p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
Source' } )
print p.communicate()[0]
print p.returncode

Output:

None
-1072365564

Code B:

p = subprocess.Popen( ['python', '-V'] )
print p.communicate()[0]
print p.returncode

Output:

Python 2.6.1
0

Any idea why passing an environment variable causes it to fail?
Thanks.


From johnforse at talktalk.net  Tue Feb  3 20:58:43 2009
From: johnforse at talktalk.net (John Forse)
Date: Wed, 4 Feb 2009 01:58:43 +0000
Subject: v 3.0 mpkg
Message-ID: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>

  Does anyone know if Python v3.0 is available as an .mpkg installer  
for Mac 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't  
find any reference to one on the Python.org download site. I've  
downloaded the Python 3.0 folder but can't follow how to install it  
without a .mpkg file. Any help would be really appreciated.
Regards
John





From btaylordesign at gmail.com  Tue Feb  3 21:36:40 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 18:36:40 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
Message-ID: <e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>

On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
>
>
> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> > <btaylordes... at gmail.com> escribi?:
>
> > > I'm having an issue specifying the path for extracting files from
> > > a .zip archive. In my method, I have:
>
> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>
> > > What is happening is that the extract method is creating a folder with
> > > the name of 'zip_name' and extracting the files to it. Example:
>
> > extract will create all directories in member name. Use open instead:
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as target:
> > ? ? ?shutil.copyfileobj(source, target)
>
> > (untested)
>
> > --
> > Gabriel Genellina
>
> Hi Gabriel,
>
> Thank you for the code sample. I figured I was going to have to use
> 'open', but I completely forgot about the 'with' statement. I was
> trying to figure out how to get access to the file object in the zip
> without having to loop over all of the items, and 'with' will allow me
> to do just that.
>
> I'll give it a shot when I get home this evening and post my results.
>
> Kind regards,
> Brandon

Ok, the first thing I needed to do was add:

from __future__ import with_statement at the beginning of my file

but:

with zip_file.open(zip_name + '/' + thumbnail_image) as source:
                    with open(os.path.join(thumbnail_path,
thumbnail_image), 'wb') as target:
                        shutil.copyfileobj(source, target)

Returns an error on the first line:

ZipExtFile instance has no attribute '__exit__'

Googling this error message is turning up nothing, and there's no
mention of the exception in the docs. Any thoughts?

TIA,
Brandon


From google at mrabarnett.plus.com  Tue Feb  3 21:44:27 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 02:44:27 +0000
Subject: Passing environment variable to "subprocess" causes failure
In-Reply-To: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
Message-ID: <4989010B.2050104@mrabarnett.plus.com>

davidgould at davidgould.com wrote:
 > I'm attempting to run subprocess and passing in an environment
 > variable. When I do this the child process fails with an error. When I
 > don't pass an environement variable it runs fine.
 >
 > BTW Running this code under Windows XP with Python 2.6.1
 >
 > Code A:
 >
 > p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
 > Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
 > Source' } )
 > print p.communicate()[0]
 > print p.returncode
 >
 > Output:
 >
 > None
 > -1072365564
 >
 > Code B:
 >
 > p = subprocess.Popen( ['python', '-V'] )
 > print p.communicate()[0]
 > print p.returncode
 >
 > Output:
 >
 > Python 2.6.1
 > 0
 >
 > Any idea why passing an environment variable causes it to fail?
 > Thanks.
 >
Are you sure it's not the path within the dict you're passing that's wrong?


From google at mrabarnett.plus.com  Tue Feb  3 21:53:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 02:53:30 +0000
Subject: Extracting file from zip archive in Python 2.6.1
In-Reply-To: <e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>	<mailman.8695.1233675948.3487.python-list@python.org>	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <4989032A.1010200@mrabarnett.plus.com>

Brandon Taylor wrote:
 > On Feb 3, 1:16 pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
 >> On Feb 3, 9:45 am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
 >>
 >>
 >>
 >>> En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor
 >>> <btaylordes... at gmail.com> escribi?:
 >>>> I'm having an issue specifying the path for extracting files from
 >>>> a .zip archive. In my method, I have:
 >>>> zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
 >>>> What is happening is that the extract method is creating a folder with
 >>>> the name of 'zip_name' and extracting the files to it. Example:
 >>> extract will create all directories in member name. Use open instead:
 >>> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
 >>>    with open(os.path.join(thumbnail_path, thumbnail_image), "wb") 
as target:
 >>>      shutil.copyfileobj(source, target)
 >>> (untested)
 >>> --
 >>> Gabriel Genellina
 >> Hi Gabriel,
 >>
 >> Thank you for the code sample. I figured I was going to have to use
 >> 'open', but I completely forgot about the 'with' statement. I was
 >> trying to figure out how to get access to the file object in the zip
 >> without having to loop over all of the items, and 'with' will allow me
 >> to do just that.
 >>
 >> I'll give it a shot when I get home this evening and post my results.
 >>
 >> Kind regards,
 >> Brandon
 >
 > Ok, the first thing I needed to do was add:
 >
 > from __future__ import with_statement at the beginning of my file
 >
 > but:
 >
 > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
 >                     with open(os.path.join(thumbnail_path,
 > thumbnail_image), 'wb') as target:
 >                         shutil.copyfileobj(source, target)
 >
 > Returns an error on the first line:
 >
 > ZipExtFile instance has no attribute '__exit__'
 >
 > Googling this error message is turning up nothing, and there's no
 > mention of the exception in the docs. Any thoughts?
 >
The 'with' statement relies on the object having __enter__ and __exit__
methods. It looks like the object returned by zip_file.open() doesn't
have them.


From raykyoto at gmail.com  Tue Feb  3 21:53:53 2009
From: raykyoto at gmail.com (Ray)
Date: Tue, 3 Feb 2009 18:53:53 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com> 
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
Message-ID: <5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>


Hi Lie,


On Feb 3, 7:21?pm, Lie <Lie.1... at gmail.com> wrote:
> On Feb 3, 1:37?pm, Ray <rayky... at gmail.com> wrote:
>
> > I'll enclose the top-level commands with the if statement above...its
> > just a minor change, but it seems unavoidable.
>
> > Thanks again!
>
> > Ray
>
> If you really don't want the file to be changed, you could (depends on
> the module) use the module as a subprocess. The ideal solution is for
> the module to have an if __name__ == '__main__': to determine whether
> it is being used as a module or a standalone program though.


Thank you for this!  I've done the "if __name__ ..." as you and others
suggested.  It isn't what I would have liked, but I'm ok with
it...especially after finding out that top-level code has to be run
while importing.  As I'm new to python, I didn't know about that, but
I now see there's no way around it.

So, is inserting the above if statement common practice for python
programmers?  As a C programmer, it seems that people put a "#ifndef
XXX...#define XXX...[all of the code]...#endif" almost as a habit.  I
wonder if its the same thing?

Thank you!

Ray



From rdmurray at bitdance.com  Tue Feb  3 22:08:31 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 03:08:31 +0000 (UTC)
Subject: Passing environment variable to "subprocess" causes failure
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
	<4989010B.2050104@mrabarnett.plus.com>
Message-ID: <gmb0re$633$1@ger.gmane.org>

Quoth MRAB <google at mrabarnett.plus.com>:
> davidgould at davidgould.com wrote:
>  > I'm attempting to run subprocess and passing in an environment
>  > variable. When I do this the child process fails with an error. When I
>  > don't pass an environement variable it runs fine.
>  >
>  > BTW Running this code under Windows XP with Python 2.6.1
>  >
>  > Code A:
>  >
>  > p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
>  > Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
>  > Source' } )
>  > print p.communicate()[0]
>  > print p.returncode
>  >
>  > Output:
>  >
>  > None
>  > -1072365564
>  >
>  > Code B:
>  >
>  > p = subprocess.Popen( ['python', '-V'] )
>  > print p.communicate()[0]
>  > print p.returncode
>  >
>  > Output:
>  >
>  > Python 2.6.1
>  > 0
>  >
>  > Any idea why passing an environment variable causes it to fail?
>  > Thanks.
>  >
> Are you sure it's not the path within the dict you're passing that's wrong?

Or there's something missing from the environment that python needs,
causing a non-zero return code when it is missing.  (That seems odd,
though.)

You ought to print communiicate()[1] to see if there is an
accompanying error message that would shed light on the problem.

--RDM



From rdmurray at bitdance.com  Tue Feb  3 22:15:18 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 03:15:18 +0000 (UTC)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <gmb186$6s3$1@ger.gmane.org>

Quoth Brandon Taylor <btaylordesign at gmail.com>:
> Ok, the first thing I needed to do was add:
> 
> from __future__ import with_statement at the beginning of my file
> 
> but:
> 
> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>                     with open(os.path.join(thumbnail_path,
> thumbnail_image), 'wb') as target:
>                         shutil.copyfileobj(source, target)
> 
> Returns an error on the first line:
> 
> ZipExtFile instance has no attribute '__exit__'
> 
> Googling this error message is turning up nothing, and there's no
> mention of the exception in the docs. Any thoughts?

Yeah, that means the ZipExtFile object hasn't been extended to
handle the context management protocol.  It would be pretty
simple to roll your own for it.  Take a look at the contextlib
module.

--RDM



From miki.tebeka at gmail.com  Tue Feb  3 22:34:15 2009
From: miki.tebeka at gmail.com (Miki)
Date: Tue, 3 Feb 2009 19:34:15 -0800 (PST)
Subject: Passing environment variable to "subprocess" causes failure
References: <13842319-2d1a-4012-aa55-977b79574288@l33g2000pri.googlegroups.com>
Message-ID: <ebde93e8-f0e8-4bc2-8fb5-9b071734b473@y1g2000pra.googlegroups.com>


> Code A:
>
> p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
> Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
> Source' } )
> print p.communicate()[0]
> print p.returncode
>
> Output:
>
> None
> -1072365564
My *guess* is that since PATH is not in the environment you're
passing, the shell can't find the python interpreter.
Try:
from os import environ
from subprocess import Popen, PIPE
env = environ.copy()
# Warning: override existing PYTHONPATH
env["PYTHONPATH"] = "C:/Documents and Settings/David Gould/workspace/
DgTools/Common/Trunk/Source"
p = = subprocess.Popen(['python', '-V'], env=env, stdout=PIPE)
print p.communicate()
print p.returncode

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From miki.tebeka at gmail.com  Tue Feb  3 22:39:29 2009
From: miki.tebeka at gmail.com (Miki)
Date: Tue, 3 Feb 2009 19:39:29 -0800 (PST)
Subject: Cross platform compilation?
References: <mailman.8731.1233699257.3487.python-list@python.org>
Message-ID: <4a4b0708-9502-4c49-8612-98ab8b6417e3@r15g2000prh.googlegroups.com>

On Feb 2, 6:59?pm, "John Harper" <j... at john-a-harper.com> wrote:
> I am trying to build Python to use in an embedded system which uses a
> ppc_440 CPU. The only information I've found is something written by
> Klaus Reimer a few years ago, which was based on Python 2.2. So far I
> seem to have successfully built Python itself, but building the
> extensions fails miserably with complaints about library format. It
> insists on referring to "i686" which is indeed the platform it is
> actually running on.
>
> Before I try to reverse engineer completely setup.py, is there
> something obvious that needs to be done to get it to use the right tool
> chain?
>
> More generally, it seems like this would be something that lots of
> people would want to do. I'm surprised there isn't support for it built
> into the distributed version of Python, without having to hack all the
> setup files...?
Maybe http://www.ailis.de/~k/archives/19-ARM-cross-compiling-howto.html
could help?

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com



From rhodri at wildebst.demon.co.uk  Tue Feb  3 22:49:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 04 Feb 2009 03:49:08 -0000
Subject: is python Object oriented??
In-Reply-To: <4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
Message-ID: <op.uos576o0a8ncjz@gnudebst>

On Wed, 04 Feb 2009 01:13:32 -0000, Russ P. <Russ.Paielli at gmail.com> wrote:

> On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> I'm very much of the second opinion; it was Russ who did the sudden  
>> volte
>> face and declared that it was trivial to circumvent.
>
> Whoa! Hold on a minute here. Your failure to understand a simple idea
> does not constitute a "sudden volte" (whatever that is) on my part.

My apologies.  "Volte-face" should have had a hyphen in it.

> Let me try to explain again what should be fairly obvious.

I understood you just fine.  It was how what you described was
consistent with your previous position that "private" was needed
for enforcement purposes, while the leading underscore convention
relied on team discipline and was therefore insufficient.  Since
you've clarified that "private" enforces privacy through... er...
team discipline, I'm now just very confused as to what you think
it buys you.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From btaylordesign at gmail.com  Tue Feb  3 22:56:32 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 3 Feb 2009 19:56:32 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com> 
	<mailman.8750.1233717333.3487.python-list@python.org>
Message-ID: <4b188330-0328-48c3-a072-041273055fb8@r24g2000vbp.googlegroups.com>

On Feb 3, 9:15?pm, rdmur... at bitdance.com wrote:
> Quoth Brandon Taylor <btaylordes... at gmail.com>:
>
>
>
> > Ok, the first thing I needed to do was add:
>
> > from __future__ import with_statement at the beginning of my file
>
> > but:
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ? ? ? ? ? ? ? ? ? with open(os.path.join(thumbnail_path,
> > thumbnail_image), 'wb') as target:
> > ? ? ? ? ? ? ? ? ? ? ? ? shutil.copyfileobj(source, target)
>
> > Returns an error on the first line:
>
> > ZipExtFile instance has no attribute '__exit__'
>
> > Googling this error message is turning up nothing, and there's no
> > mention of the exception in the docs. Any thoughts?
>
> Yeah, that means the ZipExtFile object hasn't been extended to
> handle the context management protocol. ?It would be pretty
> simple to roll your own for it. ?Take a look at the contextlib
> module.
>
> --RDM

Cool. Thanks for the pointers. In the meantime, I just used extract
and os.rename to move the files where I need them, but I'll see if I
can save that extra step if possible.


From haag at lsu.edu  Tue Feb  3 23:02:13 2009
From: haag at lsu.edu (Alaric Haag)
Date: Tue, 03 Feb 2009 22:02:13 -0600
Subject: Good or bad use of __repr__?
Message-ID: <haag-0CE93B.22021303022009@news.gmane.org>

Hello,

Is the use of __repr__ below a "really bad idea"? 

class Dimension():
    def __init__(self, setp, name):
        ptr = setp.contents.dim
        while ptr.contents.name != name:
            ptr = ptr.contents.next
        self.name = ptr.contents.name
        self.size = ptr.contents.size
        self.unlimited = bool(ptr.contents.unlimited)
        self.coord = ptr.contents.coord
    def __repr__(self):
        return '%g' % (self.size)

As written, if a program references a Dimension instance without an 
attribute, it gets the size attrbute "by default". If it wants the other 
attributes, they have to be spec'd. In the context of the code being 
developed, the "size" attribute is the "logical" representation of the 
dimension. I'm just wondering if this sort of design should be avoided.

Many thanks!

Alaric



From apt.shansen at gmail.com  Tue Feb  3 23:08:34 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 20:08:34 -0800
Subject: Import without executing module
In-Reply-To: <5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
Message-ID: <7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>

On Tue, Feb 3, 2009
> So, is inserting the above if statement common practice for python
> programmers?  As a C programmer, it seems that people put a "#ifndef
> XXX...#define XXX...[all of the code]...#endif" almost as a habit.  I
> wonder if its the same thing?

That statement is very common in Python. If a module is only ever
going to be run as the main script its not needed but as you saw with
this thread, sometimes you want to import what would be main into
other places. More commonly I've found, is the use of that statement
in other modules that are never -really- meant to be main but
sometimes you want to run on their for testing or other purposes. For
me, I use it all the time in my GUI modules that are never in the
normal course of events run directly, but when developing them its
useful to quickly start up a fake app / frame and load what I'm
working on into a test display.

That said, its use is fairly unique and idiomatic just as the 'main
entry point' of a module. 75%(a number I'm pulling outta my arse!) of
its uses are things like:
    if __name__ == "__main__":
        main()

Or whatever other minimal scaffolding is required to jumpstart the
script's driver functions. Its unlikely you'll see anything like it
elsewhere -- and it serves a very different purpose from what you
describe seeing in C. There is no need to try to make sure something
is executed/compiled only once in Python like you may want to do in C.
Every module is only ever compiled once: if you import it ten times in
ten different places only the first will compile and execute the code,
the rest of the calls will return that original module again.

You're only likely to see "if" statements around definitions and
larger blocks of top-level code if someone is doing something...
complicated. Or if they're doing a big procedural script that's not
really ever meant to be re-used (especially one that grows overtime
and takes a life of its own). It happens but its really rare, from my
experience at least.

--S


From apt.shansen at gmail.com  Tue Feb  3 23:23:40 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 3 Feb 2009 20:23:40 -0800
Subject: Good or bad use of __repr__?
In-Reply-To: <haag-0CE93B.22021303022009@news.gmane.org>
References: <haag-0CE93B.22021303022009@news.gmane.org>
Message-ID: <7a9c25c20902032023j37e719d7j6246e54cd50af37a@mail.gmail.com>

>
> As written, if a program references a Dimension instance without an
> attribute, it gets the size attrbute "by default". If it wants the other
> attributes, they have to be spec'd. In the context of the code being
> developed, the "size" attribute is the "logical" representation of the
> dimension. I'm just wondering if this sort of design should be avoided.

Well the question is: does that repr give you sufficient information
to identify at least and possibly recreate that instance?

If you repr an int and it comes up as 50.. and repr a Dimension and it
comes up as 50, does that allow you to differentiate between them? If
you need to. I primarily use repr for a debugging tool, and in that
context I'd always for instances at least make it something like
<Dimension(size=50)> as the repr output. But I personally like to err
on the side of 'more is better' when it comes to repr output, and
would probably have put in the name/unlimited/coord even if they may
not always be present. So that if you're checking something after the
fact and all you have to go on is a repr of an object involved you
have more details to work with.

But there's no hard and fast rules. Generally, repr output should be
whatever you need to clearly reflect The Specific Object as a string.

--S


From Bornstub at gmail.com  Tue Feb  3 23:37:02 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Tue, 3 Feb 2009 20:37:02 -0800 (PST)
Subject: How to call python from a foreign language thread (C++)
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<mailman.8715.1233686654.3487.python-list@python.org>
Message-ID: <a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>

On 2?4?, ??2?44?, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Feb 3, 2009, at 12:51 PM, Victor Lin wrote:
>
>
>
> > It seems that my program can't call to Python's function from thread
> > directly, because there is Global Interpreter Lock. The python's GIL
> > is so complex, I have no idea how it works. I'm sorry, what I can do
> > is to ask. My question is. What should I do before and after I call a
> > Python function from threads?
>
> Hi Victor,
> I asked a similar question yesterday and have gotten no response yet  
> -- I hope you'll have better luck. I'm writing a C extension that  
> wants to implement a callback in a new thread. Here's what I think  
> I've learned from reading the threads API doc. Please note that this  
> is a classic case of the blind leading the blind! I'm sure some (most?  
> all?) of the ideas below are wrong, but I'm hoping that thinking  
> through some of this "out loud" will help both of us. Or maybe some  
> more knowledgeable person will take pity on/be appalled by my  
> ignorance and come to our rescue. =)
>
> Python's infamous GIL doesn't exist when a program is single-threaded.  
> Before a new thread is created, the main thread must call  
> PyEval_InitThreads() to create the GIL. However, "It is not safe to  
> call this function when it is unknown which thread (if any) currently  
> has the global interpreter lock." Therefore my extension must do this:
>
> i_have_the_gil = 0;
> if (!PyEval_ThreadsInitialized()) {
>     PyEval_InitThreads();
>     /* "...when this function initializes the lock, it also acquires  
> it." */
>     i_have_the_gil = 1;
>
> }
>
> That ensures that the GIL is created.
>
> My extension will be calling from a newly-created C thread. The  
> *Python* thread doesn't exist yet; so next I have to create it.  
> Therefore --
>
> if (!i_have_the_gil)
>     PyEval_AcquireLock();
>
> // Might not actually be the main thread but conceptually
> // it is OK to assume so here.
> main_thread = PyThreadState_Get();
>
> callback_thread = PyThreadState_New(main_thread->interp);
>
> PyThreadState_Swap(callback_thread);
>
> gstate = PyGILState_Ensure();
>
> call_callback_function();
>
> // Now unwind the above
>
> PyGILState_Release(gstate);
>
> PyThreadState_Swap(main_thread);
>
> PyThreadState_Clear(callback_thread);
>
> PyThreadState_Delete(callback_thread);
>
> PyEval_ReleaseLock();
>
> I haven't yet tested this! But hopefully it is the right idea and just  
> needs a little fine tuning.
>
> I found this discussion useful:http://mail.python.org/pipermail/python-list/2006-November/413088.html
>
> It includes the quote, "The current thread state API doc, as you read  
> it from top to bottom now, is in fact totally confusing for anyone who  
> didn't develop Python himself"
>
> I like! =)
>
> Cheers
> Philip
Hi Philip,

It does not work. But however, thanks your help. I have tired so many
methods to do. But it
crash...crash..deadlock...deadlock..crash...crash... I have no any
tried success. I am going crazy. Could someone help me, thanks.


From Russ.Paielli at gmail.com  Wed Feb  4 00:04:30 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Tue, 3 Feb 2009 21:04:30 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
Message-ID: <11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>

On Feb 3, 7:49?pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> On Wed, 04 Feb 2009 01:13:32 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
> > On Feb 3, 4:05 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
> >> I'm very much of the second opinion; it was Russ who did the sudden ?
> >> volte
> >> face and declared that it was trivial to circumvent.
>
> > Whoa! Hold on a minute here. Your failure to understand a simple idea
> > does not constitute a "sudden volte" (whatever that is) on my part.
>
> My apologies. ?"Volte-face" should have had a hyphen in it.
>
> > Let me try to explain again what should be fairly obvious.
>
> I understood you just fine. ?It was how what you described was
> consistent with your previous position that "private" was needed
> for enforcement purposes, while the leading underscore convention
> relied on team discipline and was therefore insufficient. ?Since
> you've clarified that "private" enforces privacy through... er...
> team discipline, I'm now just very confused as to what you think
> it buys you.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

You need team discipline either way. The question here is to what
extent the language supports the discipline. If you are going to check
for access violations anyway with third-party tools or code reviews,
why not let the language do the job for you automatically (or at least
take a first cut at it)?

Imagine you own a company, and you decide to lease an office building.
Would you expect the office doors to have locks on them? Oh, you
would? Why? You mean you don't "trust" your co-workers? What are locks
but enforced access restriction?

What people like you are saying is that you don't need no stinkin'
locks because your co-workers are all "consenting adults" whom you
trust. Actually, you're saying even more than that. You're saying that
office doors never need locks, because everyone should trust their co-
workers. All you need is a "keep-out" sign on the door (leading
underscores). And you are presenting as evidence for your position the
fact that people occasionally get locked out of an office that they
need to get into.

I'm saying, fine, if you trust your co-workers, then keep the doors
unlocked, but please don't insist that office doors come without
locks. Yes, locks occasionally cause inconvenience, but they serve a
very useful purpose if used properly.



From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 00:18:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 05:18:29 GMT
Subject: Good or bad use of __repr__?
References: <mailman.8752.1233720145.3487.python-list@python.org>
Message-ID: <pan.2009.02.04.05.18.30@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 22:02:13 -0600, Alaric Haag wrote:

> Hello,
> 
> Is the use of __repr__ below a "really bad idea"?
> 
> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord
>     def __repr__(self):
>         return '%g' % (self.size)


As a rule of thumb, you should aim for:

eval( repr(obj) )

to recreate the obj. That's not always possible, but when possible, it is 
an ideal to aspire to. Given that, I'd recommend:

    def __repr__(self):
        return '%s(%s, %s)' % (
        self.__class__.__name__, self.ptr, self.name)
    def __str__(self):
        return "<dim=%g>" % self.size


except of course your class doesn't store ptr.


But looking at the code shown, I'm guessing you have bigger design 
problems than just what __repr__ should look like. I suggest you read 
this:

http://www.surfscranton.com/architecture/LawOfDemeter.htm


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 00:29:01 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 05:29:01 GMT
Subject: Good or bad use of __repr__?
References: <mailman.8752.1233720145.3487.python-list@python.org>
	<pan.2009.02.04.05.18.30@REMOVE.THIS.cybersource.com.au>
Message-ID: <pan.2009.02.04.05.28.58@REMOVE.THIS.cybersource.com.au>

On Wed, 04 Feb 2009 05:18:29 +0000, Steven D'Aprano wrote:

> ... I'd recommend:
> 
>     def __repr__(self):
>         return '%s(%s, %s)' % (
>         self.__class__.__name__, self.ptr, self.name)
>     def __str__(self):
>         return "<dim=%g>" % self.size
> 
> 
> except of course your class doesn't store ptr.

Ah crap, sorry, I meant setp not ptr. Sorry for the confusion.



-- 
Steven


From tjreedy at udel.edu  Wed Feb  4 00:54:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 00:54:19 -0500
Subject: Good or bad use of __repr__?
In-Reply-To: <haag-0CE93B.22021303022009@news.gmane.org>
References: <haag-0CE93B.22021303022009@news.gmane.org>
Message-ID: <gmbai8$oo8$1@ger.gmane.org>

Alaric Haag wrote:
> Hello,
> 
> Is the use of __repr__ below a "really bad idea"? 
> 
> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord
>     def __repr__(self):
>         return '%g' % (self.size)
> 
> As written, if a program references a Dimension instance without an 
> attribute, it gets the size attrbute "by default".

No it does not.  It gets a string representation of the size.  Not the 
same thing.



From raykyoto at gmail.com  Wed Feb  4 00:56:04 2009
From: raykyoto at gmail.com (Ray)
Date: Tue, 3 Feb 2009 21:56:04 -0800 (PST)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com> 
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com> 
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com> 
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com> 
	<mailman.8753.1233720522.3487.python-list@python.org>
Message-ID: <877a81a9-4f69-42d2-ab39-09ad7ca73c96@p2g2000prn.googlegroups.com>


Hi Stephen,


On Feb 4, 1:08?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> On Tue, Feb 3, 2009
>
> > So, is inserting the above if statement common practice for python
> > programmers? ?As a C programmer, it seems that people put a "#ifndef
> > XXX...#define XXX...[all of the code]...#endif" almost as a habit. ?I
> > wonder if its the same thing?
>
> That statement is very common in Python. If a module is only ever
> going to be run as the main script its not needed but as you saw with
> this thread, sometimes you want to import what would be main into
> other places. More commonly I've found, is the use of that statement
> in other modules that are never -really- meant to be main but
> sometimes you want to run on their for testing or other purposes. For

...

Oh, I see...I never thought of module testing as one possible uses of
it -- but yes, I see that now.  Makes sense to test each module
individually and (in C, at least) to write a separate main() driver in
another file each time...


> That said, its use is fairly unique and idiomatic just as the 'main
> entry point' of a module. 75%(a number I'm pulling outta my arse!) of
> its uses are things like:
> ? ? if __name__ == "__main__":
> ? ? ? ? main()
>
> Or whatever other minimal scaffolding is required to jumpstart the
> script's driver functions. Its unlikely you'll see anything like it
> elsewhere -- and it serves a very different purpose from what you
> describe seeing in C. There is no need to try to make sure something

...

Ah, ok!  I'm still trying to get use to how Python does things from
languages such as C...old habits [from other languages] are harder to
break.  :)  If the above "if" statement is fairly common, then I think
I'll start using it just to get into the habit of it.

Thank you very much for your detailed explanation!

Ray




From gagsl-py2 at yahoo.com.ar  Wed Feb  4 01:16:06 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 04:16:06 -0200
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com>
Message-ID: <op.uotc04e4x6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 00:36:40 -0200, Brandon Taylor  
<btaylordesign at gmail.com> escribi?:
> On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
>> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
>> > <btaylordes... at gmail.com> escribi?:

>> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
>> > > What is happening is that the extract method is creating a folder >  
>> > with
>> > > the name of 'zip_name' and extracting the files to it. Example:

>> > extract will create all directories in member name. Use open instead:
>> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as  
>> > target:
>> > ? ? ?shutil.copyfileobj(source, target)

> Ok, the first thing I needed to do was add:
>
> from __future__ import with_statement at the beginning of my file

That should not be necesary with your Python version (2.6.1 isn't it?)

> with zip_file.open(zip_name + '/' + thumbnail_image) as source:
>                     with open(os.path.join(thumbnail_path,
> thumbnail_image), 'wb') as target:
>                         shutil.copyfileobj(source, target)
>
> Returns an error on the first line:
>
> ZipExtFile instance has no attribute '__exit__'

Ouch, sorry, this new feature will appear in the not-yet-released 2.7  
version...
Try this instead:

source = zip_file.open(zip_name + '/' + thumbnail_image)
try:
   with open(os.path.join(thumbnail_path, thumbnail_image), 'wb') as target:
     shutil.copyfileobj(source, target)
finally:
   source.close()

-- 
Gabriel Genellina



From grante at visi.com  Wed Feb  4 01:30:37 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 04 Feb 2009 00:30:37 -0600
Subject: python libpcap equivalent
References: <mailman.8726.1233694063.3487.python-list@python.org>
	<m6-dnRn7-5IXWBXUnZ2dnUVZ_ozinZ2d@posted.visi>
	<mailman.8735.1233700694.3487.python-list@python.org>
Message-ID: <vKudnRXE0d-QqxTUnZ2dnUVZ_jednZ2d@posted.usinternet>

On 2009-02-03, Steve Holden <steve at holdenweb.com> wrote:

>> You can use pylibpcap to capture packets, and then use a raw
>> socket to send them out again on whatever interface you want.

FWIW, under Linux you can also capture packets using a raw-mode
socket, but the only times I've done it I was only capturing
packets for a single Ethertype (an Ethertype that I knew the OS
network stack was discarding).  I'm not sure if you can
configure a raw socket to intercept any and all packets such
that they don't get passed on to the network stack.

>> You'll have to make sure that the host's OS's network stack
>> isn't going to process the packets at all.  I'm not sure how
>> you go about that.
>> 
>> The documentation for pylibpcap is built into the module. See
>> doc.i in the tarball.
>
> And note that this won't work on Vista, where the raw socket
> interface is no longer available to standard applications.

[I've few clues when it comes to Windows, but based on what I
overhear from the guys at work who do work on Windows
networking stuff, I suspect doing something like this on is
going to be an order of magnitude harder on Windows than on
Linux or BSD.]

Under Unices (and prehaps Windows), there are the tun/tap
interfaces, but they do pretty much the inverse of what the OP
wants to do.  TUN/TAP interfaces are an API between a
user-space app and the OSes network stack that allows the
user-space app to "pretend" to be an Ethernet interface in the
eyes of the OS.  What the OP want's is a corresponding API
between user-space and an Ethernet card's driver such that the
user-space app can pretend to be 

-- 
Grant



From sri_annauni at yahoo.co.in  Wed Feb  4 01:48:26 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 4 Feb 2009 12:18:26 +0530 (IST)
Subject: How do i add body to email.mime.multipart.MIMEMultipart instance?
Message-ID: <460283.85034.qm@web7904.mail.in.yahoo.com>

Hi,
Could someone tell me the way to add body to the instance email.mime.multipart.MIMEMultipart instance which has attachments?

Thanks,
Srini


      Bollywood news, movie reviews, film trailers and more! Go to http://in.movies.yahoo.com/


From sri_annauni at yahoo.co.in  Wed Feb  4 01:50:43 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 4 Feb 2009 12:20:43 +0530 (IST)
Subject: How do i add body to 'email.mime.multipart.MIMEMultipart' instance?
Message-ID: <944076.49060.qm@web7906.mail.in.yahoo.com>

Hi,
Could someone tell me the way to add body content to 'email.mime.multipart.MIMEMultipart' instance?

Thanks,
Srini


      Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/


From mail at microcorp.co.za  Wed Feb  4 01:54:35 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 4 Feb 2009 08:54:35 +0200
Subject: Python Global State
References: <775033410902030758pa44e7ccl251fc82e6bb90229@mail.gmail.com>
Message-ID: <009b01c98695$712b9320$0d00a8c0@hendrik>

er  wrote:



>Simple question, I think: Is there a way to make a 
>completely global variable across a slew of modules?  
>If not, what is the canonical way to keep a global state?  
>The purpose of this is to try to prevent circular module 
>imports, which just sort of seems nasty.  Thank you!

Take a leaf out of COBOL's data division book,
and make a module that has all the globals in it.
Just refrain from calling it globals, that is the
path to insanity.
Then whenever you need the stuff, just 
import system_globals, and you are done.

This has another hidden advantage, in that the
system_globals.py can be used to keep all
sorts of system wide configuration information.

- Hendrik



From mail at microcorp.co.za  Wed Feb  4 02:09:04 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 4 Feb 2009 09:09:04 +0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de><mailman.8682.1233648428.3487.python-list@python.org>
	<Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>
Message-ID: <01a901c9869c$628e8fa0$0d00a8c0@hendrik>


"Scott David Daniels" <S...els at Acm.Org> wrote:

> You might enjoy looking at QNX, since I think it is built along the
> lines you are describing here.  I have an ancient copy of their OS,
> but haven't followed for more than couple of decades.

I vaguely know about it, and I know they claim to be hot on 
real time stuff.  I have never pursued it in any depth because
of the real tiny nature of the processors I have been working
with (8031).

When I had a cursory look at it a long time ago, it seemed
to be almost unix like in its make up, and I doubted that
I could persuade it to run on of them. (I may be dead 
wrong of course - I don't know)

I will put it on my list of stuff to try to get done.  

Thanks for the reminder.

- Hendrik




From steven at REMOVE.THIS.cybersource.com.au  Wed Feb  4 02:10:26 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Feb 2009 07:10:26 GMT
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<498825f3$0$3303$426a74cc@news.free.fr>
Message-ID: <pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>

On Tue, 03 Feb 2009 12:09:46 +0100, Bruno Desthuilliers wrote:

>> I love Python, and I'm greedy and want it all: I want a dynamic,
>> easy-to- use language *and* a compiler that can protect me from myself
> 
> That's not what compilers are for.

So you say.

 
>> and bad data.
> 
> I definitly fail to see how a compiler could protect you from *runtime*
> issues ???

I'm surprised you can't. Any time a compiler prevents an error by 
detecting it at compile-time (say, attempting to store a 96-bit float 
into the memory space allocated for a 32-bit int), it has prevented a 
runtime error.

Perhaps what you are thinking is that I meant compilers can protect you 
from "all" runtime issues. That would be silly. Although, in principle, 
we can get close, for some definition of "close".


Here's a toy function, and a specification:

def inverse(x):
    return 1.0/x

Specification: input must be a float, output must be a float.

Is that function correct? No, because it will raise an exception if 
x==0.0. Python's compiler is dumb and will allow you to write incorrect 
functions, but a smart compiler could look at that function and see that 
it was incorrect. The fix would then be to change the code, or the 
specification, or both.

Smart compilers turn some runtime errors into compile-time errors. The 
earlier you catch the error, the easier it is to fix it.

Now, that's a toy example. Languages like Ada make correctness proofs, 
well, perhaps not easy, but merely difficult compared to impossible for 
languages like Python.

To bring it back to private/public attributes, side-effects make 
correctness proofs difficult. Modifications of attributes are side-
effects. When attributes are subject to being modified by arbitrary code, 
it is harder to reason about the correctness of the code:

class Inverter(object):
    def __init__(self, x):
        # Pre-condition: x is always a float
        if x:
            self.x = x
        else:
            raise ValueError("x must not be zero")
        # Post-condition: if self.x exists, it is a non-zero float
    def invert(self):
        return 1.0/self.x


Is method invert correct?

No, it is not, because the invariant that self.x is non-zero may have 
been broken by some arbitrary piece of code elsewhere. Our ability to 
reason about the correctness of the code is weakened significantly. 
Sticking an underscore in front of x does not help: there's nothing to 
stop some arbitrary function elsewhere changing _x to zero.

There are two usual approaches to dealing with that problem which are 
available to Python programmers:

(1) Paranoia. Make the developer responsible for checking everything all 
the time:

    def invert(self):
        x = self.x
        if isinstance(x, float) and x:
            return 1.0/self.x
        else:
            raise MyError('post-condition x a non-zero float violated')

You can use decorators to decrease the amount of boilerplate, but you 
have to remember to use the decorators; or you can use a metaclass to 
automatically apply decorators, but that's hard and not very flexible. 
Whichever way you do it, you're still responsible, and whatever way, you 
still have to pay the performance penalty.

This also turns an unexpected exception into an expected exception, but 
is otherwise rather useless. It doesn't tell you when the post-condition 
was violated, or by what function, and that's the information you need in 
order to fix the bug.



(2) Hope the error never occurs, and if it does, let the caller deal with 
it. Hopefully you aren't your own caller.

That's often the Python approach. I've already written about the glorious 
freedom such an approach gives the developer. I'm not being sarcastic: 
even if you are your own caller, you get to put off worrying about a bug 
which might never happen. This is a great strategy when the worst thing 
that a bug will do is display an icon in the wrong position. Fix it in 
the next release.

But that's not a viable strategy when the consequences of a bug might 
include giving the patient 20,000 rads of radiation instead of 200:

http://www.ccnr.org/fatal_dose.html


There is a third strategy, sadly not available to Python programmers: 
prevention by catching potential errors at compile-time. (Python does 
catch some errors at compile-time, but only syntax errors.) If x can only 
be modified in a few places, (that is, it is effectively hidden or 
private) then it is much easier to reason about program correctness, 
avoid bugs, and debug those bugs which do occur.

No, this is not a panacea which will prevent every imaginable bug. Nor is 
it a replacement for unit-testing (which also does not prevent every 
imaginable bug). It is a compliment to unit-testing.

Is it subject to over-use or misuse? Of course it is. So are properties, 
and decorators, and metaclasses, and OO, and Singletons, and, well, 
everything. Let's not close our eyes to *either* the costs or the 
benefits, and let's not limit what Python might become in the future. 
Python 3 has type annotations and Guido is encouraging people to 
experiment with type systems. This was unthinkable a year or two ago. 
What might Python 4000 bring?



-- 
Steven


From tpawley at gmail.com  Wed Feb  4 02:29:47 2009
From: tpawley at gmail.com (Torabisu)
Date: Tue, 3 Feb 2009 23:29:47 -0800 (PST)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
Message-ID: <cc253e1c-e184-4c26-b227-50f119119649@r10g2000prf.googlegroups.com>

On Feb 1, 9:42?am, "mcheun... at hotmail.com" <mcheun... at hotmail.com>
wrote:
> Hi all
> ? ?what IDE is the best to write python?
> thanks
> from Peter (mcheun... at hotmail.com)

I use a combination of:

1. VI/VIM
2. Eclipse with PyDev extensions
3. NetBeans with Python Module installed

When I'm working directly on development boxes, making quick changes,
I'll use VI/VIM.  When I'm only doing Python / Django backend
development and working with Subversion I'll use Eclipse.  If I'm on a
project where I need to do Java ME work and Python / Django backend
development, then I'll use NetBeans.

My recommendation is try 3 or 4 and pick one that you feel comfortable
with.

Trav (",) T


From bob.martin at excite.com  Wed Feb  4 02:42:15 2009
From: bob.martin at excite.com (Bob Martin)
Date: Wed, 04 Feb 2009 07:42:15 GMT
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>	<e85efc5f-d141-4c5a-b228-8dba960a6838@l33g2000pri.googlegroups.com>	<gm5c08$386$1@panix3.panix.com>
	<874ozd3cr3.fsf@benfinney.id.au>	<20090202034654.GD30237@turki.gavron.org>	<8e63a5ce0902021735x45bea672tc4a655023ba11d5a@mail.gmail.com>
	<mailman.8712.1233684902.3487.python-list@python.org>
	<hV%hl.29854$Sp5.19680@text.news.virginmedia.com>
Message-ID: <rFbil.30038$Sp5.22112@text.news.virginmedia.com>

in 100686 20090203 181957 Catherine Heathcote <catherine.heathcote at gmail.com> wrote:
>Tim Rowe wrote:
>> 2009/2/3 Jervis Whitley <jervisau at gmail.com>:
>>
>>> real programmers use ed.
>>
>> Ed? Eee, tha' were lucky. We had to make holes in Hollerith cards wi'
>> our bare teeth...
>>
>
>You had teeth!?!
>
>Oh and hi, I shall be a new face in the crowd ;)

Oh dear!  You'd better tell them what they're in for ;-)


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 03:51:25 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 09:51:25 +0100
Subject: Good or bad use of __repr__?
In-Reply-To: <mailman.8752.1233720145.3487.python-list@python.org>
References: <mailman.8752.1233720145.3487.python-list@python.org>
Message-ID: <49895700$0$20332$426a34cc@news.free.fr>

Alaric Haag a ?crit :
> Hello,
> 
> Is the use of __repr__ below a "really bad idea"? 

I'd probably do the same as Stephen Hansen ("<Dimension(size=50)>") or 
at least something quite similar.


Now on a totally unrelated point (micro optimization anyone ?):

> class Dimension():
>     def __init__(self, setp, name):
>         ptr = setp.contents.dim
>         while ptr.contents.name != name:
>             ptr = ptr.contents.next
>         self.name = ptr.contents.name
>         self.size = ptr.contents.size
>         self.unlimited = bool(ptr.contents.unlimited)
>         self.coord = ptr.contents.coord

In the above code, you're constantly refering to ptr.contents, and never 
use ptr directly. Attribute lookup is not free, so it's better to avoid 
them. Local bindings lookup, OTHO, is quite fast. IOW, this would better 
be written as:

      def __init__(self, setp, name):
          contents = setp.contents.dim
          while contents.name != name:
              contents = contents.next
          self.name = contents.name
          self.size = contents.size
          self.unlimited = bool(contents.unlimited)
          self.coord = contents.coord



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:05:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:05:22 +0100
Subject: is python Object oriented??
In-Reply-To: <mailman.8728.1233694656.3487.python-list@python.org>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<mailman.8584.1233564941.3487.python-list@python.org>	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8728.1233694656.3487.python-list@python.org>
Message-ID: <49895a45$0$16900$426a74cc@news.free.fr>

Gabriel Genellina a ?crit :
> En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com> 
> escribi?:
> 
>> Suppose a library developer (or a module developer on a large team)
>> uses leading underscores. Now suppose that, for whatever reason
>> (pressure from the users, perhaps), the library developer decides to
>> change a "private" attribute to public. Now all occurrences of the
>> identifier need to be changed. If an assignment to the previously
>> "private" attribute is missed, no warning will be issued (because
>> Python allows new attributes to be added anywhere, even completely
>> outside the class definition itself). And if the library is widely
>> used, the probability of such bugs occurring is very high.
> 
> So _foo becomes foo. Then:
> 
> class X(object):
>     def get_foo(self): return self._foo
>     def set_foo(self, value): self._foo = value
>     foo = property(get_foo, set_foo)


FWIW, if there's no other need for the property, I'd do it the other way 
round : directly make foo a plain attribute, and add a _foo property 
whose accessors would raise a deprecation warning. Then there's no 
chance I miss a an assignement to _foo !-)



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:11:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:11:22 +0100
Subject: is python Object oriented??
In-Reply-To: <22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
Message-ID: <49895bad$0$28683$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
(snip)
>> after all, we have used FILE* for years and I have no idea about the FILE
>> structure.
> 
> Your lack of knowledge about it doesn't mean that it has somehow
> magically "private" members. The only reason that most of us don't
> know what a FILE is is that it's definition is implementation-defined
> (i.e., every compiler may define it differently).
> 
> That doesn't have anything to do with private members. For example, on
> my system, <stdio.h> defines FILE as:
> 
> struct _iobuf {
>         char *_ptr;
>         int   _cnt;
>         char *_base;
>         int   _flag;
>         int   _file;
>         int   _charbuf;
>         int   _bufsiz;
>         char *_tmpfname;
>         };

Didn't you notice kind of a pattern here ?

> typedef struct _iobuf FILE;
> 
> Given this information, nothing prevents me from writing things like:
> 
> FILE* fp = fopen("file.txt", "r");
> if (!fp) { /* do something */ }
> 
> printf("fp->_cnt = %d\n", fp->cnt);
> printf("fp->_flag = %d\n", fp->_flag);
> printf("fp->_file = %d\n", fp->_file);
> 
> fp->_flag = 0x20; // OOPS!!

Indeed - and that's exactly the point : nothing prevents you from 
accessing the implementation, *and yet, you don't* - unless of course 
you have a very strong reason to do so for a very specific corner case 
*and* you pretty well know what you're doing *and* you accept the 
implications.



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 04:14:30 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 10:14:30 +0100
Subject: is python Object oriented??
In-Reply-To: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
	<e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
Message-ID: <49895c69$0$28683$426a74cc@news.free.fr>

Russ P. a ?crit :
> On Feb 3, 4:14 pm, "Rhodri James" <rho... at wildebst.demon.co.uk> wrote:
>> On Tue, 03 Feb 2009 05:37:57 -0000, Russ P. <Russ.Paie... at gmail.com> wrote:
(snip)
>>> If a library developer releases the source code of a library, any user
>>> can trivially "defeat" the access restrictions. But if a team of
>>> developers is checking in code for a project, the leader(s) of the
>>> project can insist that the access restrictions be respected to
>>> simplify the management of interfaces. The larger the team, the more
>>> useful that can be. That's why Java, C++, Ada, Scala, and other
>>> languages have a "private" keyword.
>> Indeed he can.  He can even do that in Python; it just requires a little
>> self-discipline from the team, or a validation script on the code
>> repository if he really doesn't trust them.  Not only can this be done
>> without forcing the rest of the world to play, it makes things a little
>> less daunting when those nice clean interfaces turn out to be
>> incomplete/too slow/not what you thought.
> 
> This has already been refuted several times on this thread alone,

s/refuted/debated/


From jarausch at skynet.be  Wed Feb  4 04:22:13 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 10:22:13 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
Message-ID: <49895e45$0$2860$ba620e4c@news.skynet.be>

Hi,

using e.g.
import subprocess
Package='app-arch/lzma-utils'
EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
EQ_output= EQ.communicate()[0]

EQ_output is a string containing multiple lines.

I'd prefer a file-like object, e.g. EQ_OUT
so that I can loop over the lines of it like

for line in EQ_OUT :
   ...

I could use StringIO.StringIO applied to EQ_output
but this reads all of the command's output into a big
string first.

On Unix/Linux a pipe is a file-like object after all,
so how to get hold of it.


Many thanks for a hint,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From justin.mailinglists at gmail.com  Wed Feb  4 04:27:22 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Wed, 4 Feb 2009 01:27:22 -0800 (PST)
Subject: How do i add body to 'email.mime.multipart.MIMEMultipart' 
	instance?
References: <mailman.8758.1233730247.3487.python-list@python.org>
Message-ID: <62e9fa5a-dff1-425d-b3fe-cb038b717ff5@i24g2000prf.googlegroups.com>

On Feb 4, 2:50?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Hi,
> Could someone tell me the way to add body content to 'email.mime.multipart.MIMEMultipart' instance?
>
> Thanks,
> Srini

excerpt from one of the modules I use:

def build_body(html, text=''):
    text = text.strip() and text or html2text(html).encode('ascii',
'xmlcharrefreplace')
    body = MIMEMultipart('alternative')
    body.attach(MIMEText(text))
    body.attach(MIMEText(html, 'html'))
    return body

HTH

Justin



From mariusbutuc at gmail.com  Wed Feb  4 04:30:16 2009
From: mariusbutuc at gmail.com (Marius Butuc)
Date: Wed, 4 Feb 2009 01:30:16 -0800 (PST)
Subject: Load / Reload module
Message-ID: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>

Hi,

First I must state that I'm a beginner in Python, so all help would be
more than welcomed.

I want do declare some classes (classes.py) in an external editor,
than import the file and use the classes. After I change the file, I
want to reload the definitions w/o leaving the interactive
interpreter.

So far I have tried
- import classes               # doesn't import my classes
- from classes import *     # imports, but I can't reload
- reload(classes)              # I have the same class definition
after this

I've tried the documentation but I got lost, so please help.

Thanks,
Marius


From nick at craig-wood.com  Wed Feb  4 04:31:58 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 03:31:58 -0600
Subject: Code critique xmlrpclib
References: <4c54d31a-6b8e-40ba-9124-850abff6c69e@g3g2000pre.googlegroups.com>
	<slrngogniq.muq.nick@irishsea.home.craig-wood.com>
	<106ff6e6-1c23-4adb-8d89-b59d852db458@q30g2000prq.googlegroups.com>
Message-ID: <slrngoimmm.ats.nick@irishsea.home.craig-wood.com>

flagg <ianand0204 at gmail.com> wrote:
>  On Feb 3, 7:32?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> > flagg <ianand0... at gmail.com> wrote:
> > > ?This xmlrpc server is designed to parse dns zone files and then
> > > ?perform various actions on said files. \
> > > ?It uses dnspython, and xmlrpclib
> > > ? I'd like to know what some of the more experienced python users
> > > ?think. Where I could improve code, make it more efficient, whatever.
> > > ?All suggestions are welcome. ?This is my first functional python
> > > ?program, ?and I have tons of questions to go along with whatever
> > > ?suggestions. ? How could I do sanity checking; right now nothing
> > > ?checks the input to these functions, error-handling in this program is
> > > ?almost non-existant how do you integrate decent error handling into a
> > > ?piece of software......ill shut up now.
> >
> > I made a few comments, some about error handling! ?See below
> >
> >
> >
> > > ?import dns.zone
> > > ?from time import localtime, strftime, time
> > > ?import os, sys
> > > ?from dns.rdataclass import *
> > > ?from dns.rdatatype import *
> > > ?from string import Template
> > > ?import xmlrpclib
> > > ?from SimpleXMLRPCServer import SimpleXMLRPCServer
> > > ?from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
> >
> > > ?zoneDir = "/dns"
> >
> > > ?def openZoneFile(zoneFile):
> > > ? ? ?"""
> > > ? ? ?Opens a zone file. ?Then reads in zone file to dnspython zone
> > > ?object.
> > > ? ? ?"""
> > > ? ? ?global zone
> > > ? ? ?global host
> > > ? ? ?global domain
> > > ? ? ?domain = ".".join(zoneFile.split('.')[1:])
> > > ? ? ?host = ".".join(zoneFile.split('.')[:1])
> >
> > > ? ? ?try:
> > > ? ? ? ? ? ? ?zone = dns.zone.from_file(zoneDir + domain + '.zone',
> > > ?domain)
> > > ? ? ?except dns.exception, e:
> > > ? ? ? ? ? ? ?print e.__class__, e
> >
> > Don't use global variables!
> >
> > This function should probably return 3 things
> >
> > ? ? return zone, host, domain
> >
> > And whenever you use it, say
> >
> > ? ? zone, host, domain = openZoneFile(xxx)
> >
> > It should probably be a method of DNSFunctions. ?I'd avoid setting
> > self.zone etc as that is making a different sort of global data which
> > I'd avoid too.
> >
> > Also if the dns.zone.from_file didn't work (raises dns.exception) you
> > set the host and domain but the zone is left at its previous value
> > which probably isn't what you wanted. ?I'd let the error propagate
> > which I think will do something sensible for the xmlrpc.
> >
> >
> >
> > > ?class DNSFunctions:
> >
> > > ? ? ? # Not exposed to xml-rpc calls, used internally only.
> > > ? ? ?def _writeToZoneFile(self, record):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Checks if zone file exists, if it does it write values to zone
> > > ?file
> > > ? ? ? ? ?"""
> >
> > > ? ? ? ? ?for (name, ttl, rdata) in zone.iterate_rdatas(SOA):
> > > ? ? ? ? ? ? ?new_serial = int(strftime('%Y%m%d00', localtime(time())))
> > > ? ? ? ? ? ? ?if new_serial <= rdata.serial:
> > > ? ? ? ? ? ? ? ? ?new_serial = rdata.serial + 1
> > > ? ? ? ? ? ? ?rdata.serial = new_serial
> >
> > > ? ? ? ? ?if os.path.exists(zoneDir + str(zone.origin) + "zone"):
> > > ? ? ? ? ? ? ?f = open(zoneDir + str(zone.origin) + "zone", "w")
> > > ? ? ? ? ? ? ?zone.to_file(f)
> > > ? ? ? ? ? ? ?f.close()
> > > ? ? ? ? ?else:
> > > ? ? ? ? ? ? ?print "Zone: " + zone.origin + " does not exist, please
> > > ?add first"
> >
> > This should probably be raising an exception to be caught or
> > propagated back to the client via xmlrpc.
> >
> >
> >
> >
> >
> > > ? ? ?def showRecord(self, record):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Shows a record for a given zone. Prints out
> > > ? ? ? ? ?TTL, IN, Record Type, IP
> > > ? ? ? ? ?"""
> >
> > > ? ? ? ? ?openZoneFile(record)
> >
> > > ? ? ? ? ?try:
> > > ? ? ? ? ? ? ?rdataset = zone.get_node(host)
> > > ? ? ? ? ? ? ?for rdata in rdataset:
> > > ? ? ? ? ? ? ? ? ?return str(rdata)
> > > ? ? ? ? ?except:
> > > ? ? ? ? ? ? ?raise Exception("Record not found")
> >
> > > ? ? ?def changeRecord(self, record, type, target):
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?Changes a dns entry.
> > > ? ? ? ? ?@param record: which record to chance
> > > ? ? ? ? ?@param type: ?what type of record, A, MX, NS, CNAME
> > > ? ? ? ? ?@target: if CNAME target points to HOSTNAME, if A record
> > > ?points to IP
> > > ? ? ? ? ?"""
> > > ? ? ? ? ?openZoneFile(record)
> > > ? ? ? ? ?try:
> > > ? ? ? ? ? ? ?rdataset = zone.find_rdataset(host, rdtype=type)
> > > ? ? ? ? ?except:
> > > ? ? ? ? ? ? ?raise Exception("You must enter a valid record and type.
> > > ?See --usage for examples")
> >
> > Don't catch all exceptions - find out which exceptions are thrown.
> > Consider just letting it propagate - hopefully the find_rdataset error
> > is descriptive enough.
> >
> 
>  Thanks for taking the time to reply I appreciate it.

No problems.

>  Are global variables "bad"?  Or just inefficient?

They make code a lot more difficult to follow because you have to
wonder where the variable has been set.  If you create multiple
instances of DNSFunctions (more than likely in a multi-user server)
you'll find that global variables will cause your program to go wrong
quite badly!

In general only ever use global variables in quick and dirty scripts.
For static configuration which you might think globals are good for
you can easily do that in a module namespace or in a Config object
which you only have one of.

>  Also when you say:
> 
>  "Also if the dns.zone.from_file didn't work (raises dns.exception) you
>  set the host and domain but the zone is left at its previous value
>  which probably isn't what you wanted.  I'd let the error propagate
>  which I think will do something sensible for the xmlrpc."
> 
>  Could you elaborate on that.  Im not following what you mean by
>  "propagate"

I mean don't catch the exception.  If you raise an exception while in
an RPC it will get propagated back to the client which is exactly what
you want.

Eg, run this in one window

import SimpleXMLRPCServer

class SimpleTest:
    def divide(self, x, y):
        """Does an integer divide"""
        print "About to divide %r by %r" % (x, y)
        return x // y
    
server = SimpleXMLRPCServer.SimpleXMLRPCServer(("localhost", 8000))
server.register_instance(SimpleTest())
server.serve_forever()

And this in another

import xmlrpclib

server = xmlrpclib.Server('http://localhost:8000')
print server.divide(6, 3)
print server.divide(6, 2)
print server.divide(6, 0)

The client will print

2
3
Traceback (most recent call last):
  File "xmlrpc_client.py", line 6, in <module>
    print server.divide(6, 0)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1147, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1437, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.5/xmlrpclib.py", line 1201, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.5/xmlrpclib.py", line 1340, in
  _parse_response
    return u.close()
  File "/usr/lib/python2.5/xmlrpclib.py", line 787, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: "<type 'exceptions.ZeroDivisionError'>:integer division or modulo by zero">

Whereas the server will keep running with

About to divide 6 by 3
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -
About to divide 6 by 2
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -
About to divide 6 by 0
localhost - - [04/Feb/2009 09:01:56] "POST /RPC2 HTTP/1.0" 200 -

So in general if the error is caused by the client, send it back to
the client by not catching it in the server.  The server will keep
running and the client will know it has done something wrong.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Wed Feb  4 04:31:59 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 03:31:59 -0600
Subject: Cross platform compilation?
References: <gm8buh+ofl4@eGroups.com>
	<mailman.8736.1233700935.3487.python-list@python.org>
Message-ID: <slrngoinqm.ats.nick@irishsea.home.craig-wood.com>

Christian Heimes <lists at cheimes.de> wrote:
>  John Harper schrieb:
> > I am trying to build Python to use in an embedded system which uses a 
> > ppc_440 CPU. The only information I've found is something written by 
> > Klaus Reimer a few years ago, which was based on Python 2.2. So far I 
> > seem to have successfully built Python itself, but building the 
> > extensions fails miserably with complaints about library format. It 
> > insists on referring to "i686" which is indeed the platform it is 
> > actually running on.
> > 
> > Before I try to reverse engineer completely setup.py, is there 
> > something obvious that needs to be done to get it to use the right tool 
> > chain?

I spent some time mucking about trying to do this for ARM.  I almost
got it to work using qemu but not quite!  What I did in the end was to
use a pre-compiled python (from debian) then copy the headers and
library files into the cross compiling environment so we could embed
python into our code and build our extensions.

> > More generally, it seems like this would be something that lots of 
> > people would want to do. I'm surprised there isn't support for it built 
> > into the distributed version of Python, without having to hack all the 
> > setup files...?
> 
>  I'm sorry to inform you that Python doesn't support cross platform
>  compilation. Python eats its own dog food and uses Python to compile
>  optional extension modules.

It isn't an impossible problem...

If you've ever cross compiled gcc you'll find that it first uses the
host compiler (possibly not gcc) to compile itself to make a gcc which
runs on the host but makes code for the target.  It then uses that new
compiler to compile a gcc for the target architecture.

I could imagine a similar scheme for python, but it would involve lots
of fiddling about and some commitment from the python maintainers.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From clp2 at rebertia.com  Wed Feb  4 04:43:37 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 01:43:37 -0800
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <49895e45$0$2860$ba620e4c@news.skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
Message-ID: <50697b2c0902040143p66b4e2dfy7ba53e8a8397a020@mail.gmail.com>

On Wed, Feb 4, 2009 at 1:22 AM, Helmut Jarausch <jarausch at skynet.be> wrote:
> Hi,
>
> using e.g.
> import subprocess
> Package='app-arch/lzma-utils'
> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
> EQ_output= EQ.communicate()[0]
>
> EQ_output is a string containing multiple lines.
>
> I'd prefer a file-like object, e.g. EQ_OUT
> so that I can loop over the lines of it like
>
> for line in EQ_OUT :
>  ...

Is there some reason that:

for line in EQ_OUT.splitlines():
    #...

Does not meet your needs?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From skippy.hammond at gmail.com  Wed Feb  4 04:43:40 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 04 Feb 2009 20:43:40 +1100
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
Message-ID: <4989634C.4020108@gmail.com>

On 4/02/2009 4:51 AM, Victor Lin wrote:
> It may looks like this.
>
>      void operator() (double time, const AudioData&data) {
>          // acquire lock
>          m_Function(time, data);
>          // release lock
>      }

You want something like:

       void operator() (double time, const AudioData&data) {
           PyGILState_STATE old = PyGILState_Acquire();
           m_Function(time, data);
           PyGILState_Release(old);

Note that Phillip is also correct; you will need to initialize threading 
if this is an app which embeds Python...

HTH,

Mark


From Scott.Daniels at Acm.Org  Wed Feb  4 04:43:58 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 01:43:58 -0800
Subject: Load / Reload module
In-Reply-To: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
References: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
Message-ID: <cpmdnUN0pblz_xTUnZ2dnUVZ_hidnZ2d@pdx.net>

Marius Butuc wrote:
> I want do declare some classes (classes.py) in an external editor,
> than import the file and use the classes. After I change the file, I
> want to reload the definitions w/o leaving the interactive
> interpreter.
> 
> So far I have tried
> - import classes               # doesn't import my classes
Use this and refer to the class from the imported module.

     import classes
     instance = classes.SomeClass()
     ...
     reload(classes)
     instance = classes.SomeClass()

This is by far the best way, but if you _must_,
     from classes import *
     instance = SomeClass()
     ...
     reload(classes)
     from classes import *
     instance = SomeClass()

--Scott David Daniels
Scott.Daniels at Acm.Org


From skippy.hammond at gmail.com  Wed Feb  4 04:49:14 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 04 Feb 2009 20:49:14 +1100
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <4989634C.4020108@gmail.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<4989634C.4020108@gmail.com>
Message-ID: <4989649A.1000802@gmail.com>

On 4/02/2009 8:43 PM, I wrote:
> PyGILState_STATE old = PyGILState_Acquire();

Make that PyGILState_Ensure();

Mark


From andrew at acooke.org  Wed Feb  4 05:03:38 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 02:03:38 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
Message-ID: <1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>

On Feb 3, 7:35?pm, David Sevilla <sevil... at gmail.com> wrote:
> I am quite new to Linux, and thought that by using yast2 there would
> be no user problems (I am asked for the root password). I will sudo it
> to see if it solves the problem.

yast asked you for the password so that easy_install could be
installed correctly.

you are now using "sudo easy_install" to install mnemosyne and sudo is
asking for the root password.

each time you install something you need to change public files on the
system, and so each time you need to use root in some way.  yast does
this by logging in as root for you, but needs the password to do it.
sudo does the same thing, but again needs the password to do it.

hope that makes senses (and that this worked).

andrew


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb  4 05:12:40 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 11:12:40 +0100
Subject: is python Object oriented??
In-Reply-To: <pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>	<mailman.8395.1233347525.3487.python-list@python.org>	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>	<mailman.8483.1233433642.3487.python-list@python.org>	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>	<6ul2ieFg1sraU1@mid.uni-berlin.de>	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>	<005201c98549$d3eb74a0$0d00a8c0@hendrik>	<mailman.8661.1233621338.3487.python-list@python.org>	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>	<mailman.8668.1233632951.3487.python-list@python.org>	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>	<498825f3$0$3303$426a74cc@news.free.fr>
	<pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <49896a0b$0$3507$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Tue, 03 Feb 2009 12:09:46 +0100, Bruno Desthuilliers wrote:
> 
>>> I love Python, and I'm greedy and want it all: I want a dynamic,
>>> easy-to- use language *and* a compiler that can protect me from myself
>> That's not what compilers are for.
> 
> So you say.

While it's quite clear that a compiler for a statically typed language 
can catch at least some type errors, this is still not what a compiler 
is for. A compiler is here to compile you source code into a suitable 
representation for the execution environment. And FWIW, some compilers 
are rather weaker than Python when it comes to "protecting you from 
yourself".

>  
>>> and bad data.
>> I definitly fail to see how a compiler could protect you from *runtime*
>> issues ???
> 
> I'm surprised you can't. Any time a compiler prevents an error by 
> detecting it at compile-time (say, attempting to store a 96-bit float 
> into the memory space allocated for a 32-bit int),

Oh, you meant "type error". But this is a programming error, not "bad 
data". "bad data" is something you get (usually from the outside world) 
at runtime only. Well, the way I understand it, at least.

> 
> Perhaps what you are thinking is that I meant compilers can protect you 
> from "all" runtime issues. That would be silly. Although, in principle, 
> we can get close, for some definition of "close".
> 
> 
> Here's a toy function, and a specification:
> 
> def inverse(x):
>     return 1.0/x
> 
> Specification: input must be a float, output must be a float.
> 
> Is that function correct? No, because it will raise an exception if 
> x==0.0. Python's compiler is dumb and will allow you to write incorrect 
> functions, but a smart compiler could look at that function and see that 
> it was incorrect. The fix would then be to change the code, or the 
> specification, or both.

Ok, let's see. What happens if you pass 0.0 to the function as-is ? Yes, 
indeed, you get a runtime error. Now what happens if you add error 
handling to the function itself ? What will the error handler do ? Yes, 
raise a runtime error. So far, I don't see any gain here. No, no, don't 
answer yet. Sure, what you need here is a compiler that can inspect the 
whole code source using this function to make sure it is always properly 
invoked. Mmm, wait - will this work with shared libs ? I'm afraid not. 
Ok, so you have to change the specification to : "input must be a 
non-zero-float", and use the type system to define non-zero-float type.

> Smart compilers turn some runtime errors into compile-time errors.

Indeed.

> The 
> earlier you catch the error, the easier it is to fix it.

Indeed.

> Now, that's a toy example. Languages like Ada make correctness proofs, 
> well, perhaps not easy, but merely difficult compared to impossible for 
> languages like Python.

Indeed. And that's fine : if we want maximum type safety and 
as-possibly-proved code, we know which tool to use. Now good luck doing 
web development, system admin, app scripting and quite a lot of other 
things (well, perhaps more that 80% of ordinary application programming) 
in Ada.

Can you understand that not everybody needs maximum type safety / 
correctness proof etc for all his code ? That all this "security" stuff 
comes with a price that may not be worth paying ?

> To bring it back to private/public attributes, side-effects make 
> correctness proofs difficult. Modifications of attributes are side-
> effects.

Then use a functional language !-)

> When attributes are subject to being modified by arbitrary code, 
> it is harder to reason about the correctness of the code:

Indeed. Not the right tool, obviously. OTHO, it makes it way easier to 
use as glue between different, sometimes not highly compatible components.

(snip)

> There are two usual approaches to dealing with that problem which are 
> available to Python programmers:
> 
> (1) Paranoia. Make the developer responsible for checking everything all 
> the time:


Paranoiacs (also known as control-freaks) are not happy using Python. 
They usually prefer Ada or, at least, Java.

>     def invert(self):
>         x = self.x
>         if isinstance(x, float) and x:
>             return 1.0/self.x
>         else:
>             raise MyError('post-condition x a non-zero float violated')


The correct solution is indeed to make x a property with a sanity check 
in the setter - in which case you'll have a useful traceback - or as a 
read-only property, or even better to just declare it as implementation 
(naming it _x).

> 
> (2) Hope the error never occurs, and if it does, let the caller deal with 
> it.

If the attribute is either a read-only property or an implementation 
attribute, then the guy that messed with it is responsible for the 
possible consequences. That's the contract, yes.

> Hopefully you aren't your own caller.

I'm usually the first user of my own libs, and my coworkers comes 
immediatly after. IOW, I eat my own dogfood, thanks.

> That's often the Python approach.

As I explained above, the "Python approach" is actually a bit different.

In your example code, you explicitely declared x as a *public* 
attribute. Which is not wise - whatever the language - if you have to 
maintain invariants on this attribute. Make it either an implementation 
attribute or a read-only property.

(snip usual stuff about nuclear disasters, x-ray-overdosed patients etc)

> There is a third strategy, sadly not available to Python programmers: 
> prevention by catching potential errors at compile-time. (Python does 
> catch some errors at compile-time, but only syntax errors.)

Yes. Because *everything* else happens at runtime. Remember, even "def" 
and "class" are executable statements.

> If x can only 
> be modified in a few places, (that is, it is effectively hidden or 
> private) then it is much easier to reason about program correctness, 
> avoid bugs, and debug those bugs which do occur.

Would you then say that Ruby has "real privates" attributes ?


> No, this is not a panacea which will prevent every imaginable bug.

Indeed.

> Nor is 
> it a replacement for unit-testing (which also does not prevent every 
> imaginable bug). 

Neither.



From thorsten at thorstenkampe.de  Wed Feb  4 05:14:55 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 4 Feb 2009 11:14:55 +0100
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <MPG.23f38905b623184e9897bf@news.individual.de>

* Russ P. (Tue, 3 Feb 2009 21:04:30 -0800 (PST))
> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?
> 
> What people like you are saying is that you don't need no stinkin'
> locks because your co-workers are all "consenting adults" whom you
> trust. Actually, you're saying even more than that. You're saying that
> office doors never need locks, because everyone should trust their co-
> workers. All you need is a "keep-out" sign on the door (leading
> underscores). And you are presenting as evidence for your position the
> fact that people occasionally get locked out of an office that they
> need to get into.
> 
> I'm saying, fine, if you trust your co-workers, then keep the doors
> unlocked, but please don't insist that office doors come without
> locks. Yes, locks occasionally cause inconvenience, but they serve a
> very useful purpose if used properly.

This analogy is not adequate. If someone uses your library then it is 
his office and nothing can stop him. Someone else gave a better analogy 
with a device that says that the warranty is lost if you open it. And 
that's exactly the same with the underscore convention.

Thorsten


From robin at reportlab.com  Wed Feb  4 05:14:56 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 04 Feb 2009 10:14:56 +0000
Subject: x64 speed
In-Reply-To: <4988BAE8.2060204@v.loewis.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>
	<4988BAE8.2060204@v.loewis.de>
Message-ID: <49896AA0.2050202@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>>> I follow David's guess that Linux does better IO than Windows (not
>>> knowing anything about the benchmark, of course)
>>>
>> I originally thought it must be the vmware host stuff offloading IO to
>> the second core, but watching with sysinternals didn't show a lot of
>> extra stuff going on with the vm compared to just running on the host.
> 
> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
> Linux buffer handling, is just more efficient than NTFS, and the Windows
> buffer handling.
> 
> If you split the total runtime into system time and user time, how do
> the 30s split up?
.......
so here is one for the vm clock is bad theorists :)


> [rptlab at localhost tests]$ time python25 runAll.py
> .............................................................

.........................
> ----------------------------------------------------------------------
> Ran 193 tests in 27.841s
> 
> OK
> 
> real    0m28.150s
> user    0m26.606s
> sys     0m0.917s
> [rptlab at localhost tests]$

magical how the total python time is less than the real time.
-- 
Robin Becker


From robin at reportlab.com  Wed Feb  4 05:14:56 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 04 Feb 2009 10:14:56 +0000
Subject: x64 speed
In-Reply-To: <4988BAE8.2060204@v.loewis.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>
	<4988BAE8.2060204@v.loewis.de>
Message-ID: <49896AA0.2050202@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>>> I follow David's guess that Linux does better IO than Windows (not
>>> knowing anything about the benchmark, of course)
>>>
>> I originally thought it must be the vmware host stuff offloading IO to
>> the second core, but watching with sysinternals didn't show a lot of
>> extra stuff going on with the vm compared to just running on the host.
> 
> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
> Linux buffer handling, is just more efficient than NTFS, and the Windows
> buffer handling.
> 
> If you split the total runtime into system time and user time, how do
> the 30s split up?
.......
so here is one for the vm clock is bad theorists :)


> [rptlab at localhost tests]$ time python25 runAll.py
> .............................................................

.........................
> ----------------------------------------------------------------------
> Ran 193 tests in 27.841s
> 
> OK
> 
> real    0m28.150s
> user    0m26.606s
> sys     0m0.917s
> [rptlab at localhost tests]$

magical how the total python time is less than the real time.
-- 
Robin Becker



From nick at craig-wood.com  Wed Feb  4 05:31:58 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 04 Feb 2009 04:31:58 -0600
Subject: MySQLdb and MySQL stored functions
References: <c99354b7-3bb5-41e8-9577-5c4827c969ed@m2g2000vbp.googlegroups.com>
	<hLqdnenYkKm3nRXUnZ2dnUVZ_g2dnZ2d@earthlink.com>
	<0fef1833-2dae-44d2-a719-9a036ca0907c@l37g2000vba.googlegroups.com>
Message-ID: <slrngoio1a.ats.nick@irishsea.home.craig-wood.com>

kurt.forrester.fec at googlemail.com <kurt.forrester.fec at googlemail.com> wrote:
>  Any ideas on how to suppress the warning output:
>  __main__:1: Warning: No data - zero rows fetched, selected, or
>  processed

You can use the warnings module to suppress these I would have
thought.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From jarausch at skynet.be  Wed Feb  4 05:48:42 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 11:48:42 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8762.1233740621.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8762.1233740621.3487.python-list@python.org>
Message-ID: <49897289$0$2855$ba620e4c@news.skynet.be>

Chris Rebert wrote:
> On Wed, Feb 4, 2009 at 1:22 AM, Helmut Jarausch <jarausch at skynet.be> wrote:
>> Hi,
>>
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>>
>> EQ_output is a string containing multiple lines.
>>
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
>>
>> for line in EQ_OUT :
>>  ...
> 
> Is there some reason that:
> 
> for line in EQ_OUT.splitlines():
>     #...
> 
> Does not meet your needs?
> 

It works, but it still reads the complete output of the
command executed by Popen at once.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From __peter__ at web.de  Wed Feb  4 05:49:55 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 04 Feb 2009 11:49:55 +0100
Subject: Load / Reload module
References: <73783af1-803d-4baf-b428-85682c476e2f@w24g2000prd.googlegroups.com>
	<cpmdnUN0pblz_xTUnZ2dnUVZ_hidnZ2d@pdx.net>
Message-ID: <gmbrsj$kdt$01$1@news.t-online.com>

Scott David Daniels wrote:

> Marius Butuc wrote:
>> I want do declare some classes (classes.py) in an external editor,
>> than import the file and use the classes. After I change the file, I
>> want to reload the definitions w/o leaving the interactive
>> interpreter.
>> 
>> So far I have tried
>> - import classes               # doesn't import my classes
> Use this and refer to the class from the imported module.
> 
>      import classes
>      instance = classes.SomeClass()
>      ...
>      reload(classes)
>      instance = classes.SomeClass()
> 
> This is by far the best way, but if you _must_,
>      from classes import *
>      instance = SomeClass()
>      ...
>      reload(classes)
>      from classes import *
>      instance = SomeClass()

Also note that only instances created after the reload will have the new
layout:

>>> import classes
>>> a = classes.SomeClass()
>>> print a
old
>>> open("classes.py", "w").write("""class SomeClass:
...   def __str__(self): return 'new'
... """)
>>> reload(classes)
<module 'classes' from 'classes.py'>
>>> b = classes.SomeClass()
>>> print b
new
>>> print a
old

Sometimes you may be able to fix this manually by assigning to the
__class__:

>>> a.__class__ = classes.SomeClass
>>> print a
new

but I recommend that you put all your code into a another script rather than
resorting to such tricks

$ cat main.py
import classes
a = classes.SomeClass()

If you want to experiment with a in the interactive interpreter you can
invoke main with the -i option:

$ python -i main.py
>>> print a
new

Peter


From tino at wildenhain.de  Wed Feb  4 06:31:33 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 12:31:33 +0100
Subject: Locating python
In-Reply-To: <1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
Message-ID: <49897C95.1000301@wildenhain.de>

andrew cooke wrote:
> On Feb 3, 7:35 pm, David Sevilla <sevil... at gmail.com> wrote:
>> I am quite new to Linux, and thought that by using yast2 there would
>> be no user problems (I am asked for the root password). I will sudo it
>> to see if it solves the problem.
> 
> yast asked you for the password so that easy_install could be
> installed correctly.
> 
> you are now using "sudo easy_install" to install mnemosyne and sudo is
> asking for the root password.
> 
> each time you install something you need to change public files on the
> system, and so each time you need to use root in some way.  yast does
> this by logging in as root for you, but needs the password to do it.
> sudo does the same thing, but again needs the password to do it.
> 
> hope that makes senses (and that this worked).

actually "su" needs the root (or the target users') password
and sudo needs _your_ (the current users) password.

HTH
Tino
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From simon at brunningonline.net  Wed Feb  4 06:37:26 2009
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 4 Feb 2009 11:37:26 +0000
Subject: v 3.0 mpkg
In-Reply-To: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
Message-ID: <8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>

2009/2/4 John Forse <johnforse at talktalk.net>:
>  Does anyone know if Python v3.0 is available as an .mpkg installer for Mac
> 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't find any
> reference to one on the Python.org download site. I've downloaded the Python
> 3.0 folder but can't follow how to install it without a .mpkg file. Any help
> would be really appreciated.

AFAIK there's no Python 3.0 installer for the Mac. You'll have to
build it yourself - see <http://tinyurl.com/6zkem7>.

-- 
Cheers,
Simon B.


From noama at answers.com  Wed Feb  4 06:40:59 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 4 Feb 2009 13:40:59 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <49897C95.1000301@wildenhain.de>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>

Hi All,
I have a script in which I receive a list of functions. I iterate over
the list and run each function. This functions are created by some other
user who is using the lib I wrote. Now, there are some cases in which
the function I receive will never finish (stuck in infinite loop).
Suppose I use a thread which times the amount of time passed since the
function has started, Is there some way I can kill the function after a
certain amount of time has passed (without asking the user who's giving
me the list of functions to make them all have some way of notifying
them to finish)?
Thanks, Noam


From nosklo at gmail.com  Wed Feb  4 07:06:58 2009
From: nosklo at gmail.com (Clovis Fabricio)
Date: Wed, 4 Feb 2009 10:06:58 -0200
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <49895e45$0$2860$ba620e4c@news.skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
Message-ID: <9187a60d0902040406s7d1e5da1l44ee57abf0e6c8e@mail.gmail.com>

2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
> using e.g.
> import subprocess
> Package='app-arch/lzma-utils'
> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
> EQ_output= EQ.communicate()[0]
> EQ_output is a string containing multiple lines.
> I'd prefer a file-like object, e.g. EQ_OUT
> so that I can loop over the lines of it like

EQ.stdout is the filelike object you're looking for.
communicate() grabs entire output at once so don't use it.

import subprocess
Package = 'app-arch/lzma-utils'
EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
stdout=subprocess.PIPE)
for line in EQ.stdout:
    do_stuff_with(line)


From kareta at web.de  Wed Feb  4 07:12:51 2009
From: kareta at web.de (Juergen Kareta)
Date: Wed, 04 Feb 2009 13:12:51 +0100
Subject: python libpcap equivalent
In-Reply-To: <mailman.8726.1233694063.3487.python-list@python.org>
References: <mailman.8726.1233694063.3487.python-list@python.org>
Message-ID: <6utf23Fh6fakU1@mid.individual.net>

Gabriel schrieb:
> Hello
> 
> I need to write a software router [yes, software equivalent to a 
> hardware box that is routing packets .)]. It's a school
> work..
> Question is: is possible write this kind of application in python? and 
> if it's, what module should i use?
> I tried search for some libpcap equivalent in python and found 
> pylibpcap, but can't find documentation and tutorial.

Hello Gabriel,

you might look into scapy:
http://www.secdev.org/projects/scapy/

which easily allows you to fetch, manipulate and send network packages.

J?rgen


From jarausch at skynet.be  Wed Feb  4 07:13:03 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 13:13:03 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8770.1233749221.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
Message-ID: <4989864F.50700@skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>> EQ_output is a string containing multiple lines.
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
> 
> EQ.stdout is the filelike object you're looking for.
> communicate() grabs entire output at once so don't use it.
> 
> import subprocess
> Package = 'app-arch/lzma-utils'
> EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
> stdout=subprocess.PIPE)
> for line in EQ.stdout:
>     do_stuff_with(line)

Thanks a lot, I haven't found that in the official documentation.
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From jarausch at skynet.be  Wed Feb  4 07:13:03 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 13:13:03 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8770.1233749221.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
Message-ID: <4989864F.50700@skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> using e.g.
>> import subprocess
>> Package='app-arch/lzma-utils'
>> EQ=subprocess.Popen(['/usr/bin/equery','depends',Package],stdout=subprocess.PIPE)
>> EQ_output= EQ.communicate()[0]
>> EQ_output is a string containing multiple lines.
>> I'd prefer a file-like object, e.g. EQ_OUT
>> so that I can loop over the lines of it like
> 
> EQ.stdout is the filelike object you're looking for.
> communicate() grabs entire output at once so don't use it.
> 
> import subprocess
> Package = 'app-arch/lzma-utils'
> EQ = subprocess.Popen(['/usr/bin/equery', 'depends', Package],
> stdout=subprocess.PIPE)
> for line in EQ.stdout:
>     do_stuff_with(line)

Thanks a lot, I haven't found that in the official documentation.
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From andrew at acooke.org  Wed Feb  4 07:16:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 04:16:37 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com> 
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com> 
	<mailman.8767.1233747099.3487.python-list@python.org>
Message-ID: <86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>

> actually "su" needs the root (or the target users') password
> and sudo needs _your_ (the current users) password.

argh, sorry for the confusion.


From nosklo at gmail.com  Wed Feb  4 07:19:33 2009
From: nosklo at gmail.com (Clovis Fabricio)
Date: Wed, 4 Feb 2009 10:19:33 -0200
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <4989864F.50700@skynet.be>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<mailman.8770.1233749221.3487.python-list@python.org>
	<4989864F.50700@skynet.be>
Message-ID: <9187a60d0902040419h3eb27695v97e336c13b5d1e30@mail.gmail.com>

2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>> EQ.stdout is the filelike object you're looking for.
>> communicate() grabs entire output at once so don't use it.
> Thanks a lot, I haven't found that in the official documentation.
> Helmut.

That would be a documentation bug.
Fortunately it is not true. Here is it in the documentation:

http://docs.python.org/library/subprocess.html#subprocess.Popen.stdout


From andrew at acooke.org  Wed Feb  4 07:29:12 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 04:29:12 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com> 
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com> 
	<mailman.8767.1233747099.3487.python-list@python.org>
	<86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>
Message-ID: <44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>

On Feb 4, 9:16?am, andrew cooke <and... at acooke.org> wrote:
> > actually "su" needs the root (or the target users') password
> > and sudo needs _your_ (the current users) password.
>
> argh, sorry for the confusion.

actually, no.  sudo requires the root password.  at least on opensuse
11.1 default config.  i just tried it:

> Python-2.5.4: sudo make install
root's password:

this is explained in the sudoers file:

 # In the default (unconfigured) configuration, sudo asks for the root
password.
 # This allows use of an ordinary user account for administration of a
freshly
 # installed system. When configuring sudo, delete the two
 # following lines:
 Defaults targetpw   # ask for the password of the target user i.e.
root
 ALL     ALL=(ALL) ALL   # WARNING! Only use this together with
'Defaults targetpw'!

andrew


From jarausch at skynet.be  Wed Feb  4 08:00:53 2009
From: jarausch at skynet.be (Helmut Jarausch)
Date: Wed, 04 Feb 2009 14:00:53 +0100
Subject: subprocess.Popen - file like object from stdout=PIPE
In-Reply-To: <mailman.8772.1233749977.3487.python-list@python.org>
References: <49895e45$0$2860$ba620e4c@news.skynet.be>	<mailman.8770.1233749221.3487.python-list@python.org>	<4989864F.50700@skynet.be>
	<mailman.8772.1233749977.3487.python-list@python.org>
Message-ID: <49899185$0$2861$ba620e4c@news.skynet.be>

Clovis Fabricio wrote:
> 2009/2/4 Helmut Jarausch <jarausch at skynet.be>:
>>> EQ.stdout is the filelike object you're looking for.
>>> communicate() grabs entire output at once so don't use it.
>> Thanks a lot, I haven't found that in the official documentation.
>> Helmut.
> 
> That would be a documentation bug.
> Fortunately it is not true. Here is it in the documentation:
> 
> http://docs.python.org/library/subprocess.html#subprocess.Popen.stdout

Thanks!

For people like me which don't always read until the end of a document
it would be nice if just after the paragraph

stdin, stdout and stderr specify the executed programs? standard input, standard output and standard error file handles, 
respectively. Valid values are PIPE, an existing file descriptor (a positive integer), an existing file object, and 
None. PIPE indicates that a new pipe to the child should be created. With None, no redirection will occur; the child?s 
file handles will be inherited from the parent. Additionally, stderr can be STDOUT, which indicates that the stderr data 
from the applications should be captured into the same file handle as for stdout.

there would some lines like

These pipes are exposed as file-like objects which can be accessed via the
stdin, stdout or stderr (resp.) attributes of an object of class subprocess.Popen .

Please be indulgent to people like me.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From kyrie at uh.cu  Wed Feb  4 08:27:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 04 Feb 2009 08:27:10 -0500
Subject: is python Object oriented??
In-Reply-To: <e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8741.1233706471.3487.python-list@python.org>
	<e0c6e480-885a-440d-8efe-62e5c5744f44@g39g2000pri.googlegroups.com>
Message-ID: <1233754030.498997ae36410@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> > Indeed he can.  He can even do that in Python; it just requires a little
> > self-discipline from the team, or a validation script on the code
> > repository if he really doesn't trust them.  Not only can this be done
> > without forcing the rest of the world to play, it makes things a little
> > less daunting when those nice clean interfaces turn out to be
> > incomplete/too slow/not what you thought.
> 
> This has already been refuted several times on this thread alone, so I
> will not bother doing it again.
> 

Please, point out where, because I don't recall you explaining why is not enough
to use a "validation script" on the code if you wish to. I _do_ recall you
saying that you didn't want the validation script unless it is integrated with
python, but I'm yet to see the difference.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From kyrie at uh.cu  Wed Feb  4 08:35:50 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 04 Feb 2009 08:35:50 -0500
Subject: is python Object oriented??
In-Reply-To: <11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <1233754550.498999b6356d9@mail.uh.cu>


Quoting "Russ P." <Russ.Paielli at gmail.com>:

> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?

This analogy is nonsense. There is no way you will execute code on my system if
I don't authorize it, regardless of how "public" are the variables declared in
my code. No one will execute code on _your_ system either, without your
authorization. That puts you in a different position: you can easily _check_
that everything is alright before executing, whereas in the office example, it
cannot be done.

Of course, if the analogy is flawed in such an essential aspect, I won't even
humor it. I worry, though, that you obviously believe that it is not flawed.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie




From Pat at junk.net  Wed Feb  4 09:38:04 2009
From: Pat at junk.net (Pat)
Date: Wed, 04 Feb 2009 09:38:04 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de>
Message-ID: <gmc979$b9r$1@aioe.org>

Andreas Waldenburger wrote:
> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
> 
>> Tobiah wrote:
>>> Just out of curiosity, why was len() made to
>>> be it's own function?  I often find myself
>>> typing things like my_list.len before I
>>> catch myself.
>>>
>>> Thanks,
>>>
>>> Toby
>> I'm surprised that no one responded to that question.
>>
> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
> Might it be that your newsserver is a bit laggy?
> 
> regards
> /W
> 

Might be laggy.  Who knows.

Why didn't you answer the len() question?


From unews at nospam.onlinehome.de  Wed Feb  4 09:46:53 2009
From: unews at nospam.onlinehome.de (Uwe Grauer)
Date: Wed, 04 Feb 2009 15:46:53 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <mailman.8719.1233689579.3487.python-list@python.org>
References: <mailman.8719.1233689579.3487.python-list@python.org>
Message-ID: <gmc9ot$ops$1@online.de>

Laszlo Nagy wrote:
> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
> FireBird 1.5?
> 
> My problem:
> 
>    * python 2.6 already installed on a server
>    * there is a firebird 1.5 database on the same server
>    * I need to access it from python 2.6
> 
> Any thoughts?
> 
> 

Get it from here:
http://www.firebirdsql.org/index.php?op=devel&sub=python

You should have mentioned your OS to get better answers.

Uwe


From ljjediknight at gmail.com  Wed Feb  4 10:01:23 2009
From: ljjediknight at gmail.com (Luke)
Date: Wed, 4 Feb 2009 07:01:23 -0800 (PST)
Subject: Tkinter
Message-ID: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>

Hello, I'm an inexperienced programmer and I'm trying to make a
Tkinter window and have so far been unsuccessful in being able to
delete widgets from the main window and then add new ones back into
the window without closing the main window.

The coding looks similar to this:

from Tkinter import *
def MainWin():
    main=Tk()
    main.geometry('640x480')
    back_ground=Frame(main,width=640,height=480,bg='black')
    back_ground.pack_propagate(0)
    back_ground.pack(side=TOP,anchor=N)
    frame1=Frame(back_ground,width=213,height=480,bg='light gray')
    frame1.pack_propagate(0)
    frame1.pack(side=TOP,anchor=N)
    close_frame1=Button(frame1,text='close',bg='light gray',
command=frame1.destroy)
    close_frame1.pack_propagate(0)
    close_frame1.pack(side=TOP, anchor=N,pady=25)
    if frame1.destroy==True:
        frame1=Frame(back_ground,width=213,height=480,bg='white')
        frame1.pack_propagate(0)
        frame1.pack(side=TOP,anchor=N)
    main.mainloop()
MainWin()

It may just be bad coding but either way I could use some help.

Thanks


From marco at sferacarta.com  Wed Feb  4 10:02:08 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 04 Feb 2009 16:02:08 +0100
Subject: len()
In-Reply-To: <gmc979$b9r$1@aioe.org>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de> <gmc979$b9r$1@aioe.org>
Message-ID: <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>

Pat wrote:

> Why didn't you answer the len() question?

It's a bit of a FAQ: len() cannot be a method of list objects because it 
works on any sequence or iterable.



From floris.bruynooghe at gmail.com  Wed Feb  4 10:08:32 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Wed, 4 Feb 2009 07:08:32 -0800 (PST)
Subject: x64 speed
References: <mailman.8707.1233682582.3487.python-list@python.org> 
	<4988a1f1$0$3390$9b622d9e@news.freenet.de>
	<4988B615.4060206@jessikat.plus.net> 
	<4988BAE8.2060204@v.loewis.de>
	<mailman.8766.1233742525.3487.python-list@python.org>
Message-ID: <b2e99eb5-2c19-4886-ae00-30f5d7ead160@i18g2000prf.googlegroups.com>

On Feb 4, 10:14?am, Robin Becker <ro... at reportlab.com> wrote:
> > [rptlab at localhost tests]$ time python25 runAll.py
> > .............................................................
>
> .........................
>
> > ----------------------------------------------------------------------
> > Ran 193 tests in 27.841s
>
> > OK
>
> > real ? ?0m28.150s
> > user ? ?0m26.606s
> > sys ? ? 0m0.917s
> > [rptlab at localhost tests]$
>
> magical how the total python time is less than the real time.

Not really.  Python was still running at the time that it prints the
time of the tests.  So it's only natural that the wall time Python
prints on just the tests is going to be smaller then the wall time
time prints for the entire python process.  Same for when it starts,
some stuff is done in Python before it starts its timer.

Regards
Floris



From tino at wildenhain.de  Wed Feb  4 10:14:58 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 16:14:58 +0100
Subject: Locating python
In-Reply-To: <44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<mailman.8767.1233747099.3487.python-list@python.org>	<86d1c582-650f-487c-a5bd-16ce94a0b03a@w1g2000prk.googlegroups.com>
	<44486906-2212-4b38-8a2f-6a941eaddf0a@u14g2000yqg.googlegroups.com>
Message-ID: <4989B0F2.30107@wildenhain.de>

andrew cooke wrote:
> On Feb 4, 9:16 am, andrew cooke <and... at acooke.org> wrote:
>>> actually "su" needs the root (or the target users') password
>>> and sudo needs _your_ (the current users) password.
>> argh, sorry for the confusion.
> 
> actually, no.  sudo requires the root password.  at least on opensuse
> 11.1 default config.  i just tried it:
> 

argh. This N?rnberg Windows ;-)

But this shows that a sensible configuration of the
system is usefull before you start installing
services on it :-)

Cheers
Tino

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From matt.dubins at sympatico.ca  Wed Feb  4 10:21:14 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Wed, 4 Feb 2009 07:21:14 -0800 (PST)
Subject: tkSimpleDialog window focus problem
Message-ID: <238e1e3c-66aa-45de-9a67-2b91e15bc465@x6g2000pre.googlegroups.com>

Hi all,

As part of the program I've created and am maintaining, the user has
to type in his/her username and password into tkinter simple dialog
windows.  What you'll see below is that I've nested an askstring
dialog window within a call to use the ftp module to login to an FTP
server.

result = self.ftp.login(self.userid, tkSimpleDialog.askstring
("Password Entry",
                                              "Password:", show="*"))

Annoyingly, every time this password entry window pops up, the focus
does not go on it automatically.  Anyone know what I can do to put the
focus on it automatically, while *not* storing the user's password in
my script for the remainder of its runtime?

Thanks,
Matt Dubins


From marduk at letterboxes.org  Wed Feb  4 10:25:52 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 04 Feb 2009 10:25:52 -0500
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
	<749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
Message-ID: <1233761152.373.14.camel@localhost.localdomain>

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after a
> certain amount of time has passed (without asking the user who's giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a





From Russ.Paielli at gmail.com  Wed Feb  4 10:53:54 2009
From: Russ.Paielli at gmail.com (Russ P.)
Date: Wed, 4 Feb 2009 07:53:54 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik> 
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au> 
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
	<mailman.8774.1233754556.3487.python-list@python.org>
Message-ID: <fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>

On Feb 4, 5:35?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> Quoting "Russ P." <Russ.Paie... at gmail.com>:
>
> > Imagine you own a company, and you decide to lease an office building.
> > Would you expect the office doors to have locks on them? Oh, you
> > would? Why? You mean you don't "trust" your co-workers? What are locks
> > but enforced access restriction?
>
> This analogy is nonsense. There is no way you will execute code on my system if
> I don't authorize it, regardless of how "public" are the variables declared in
> my code. No one will execute code on _your_ system either, without your
> authorization. That puts you in a different position: you can easily _check_
> that everything is alright before executing, whereas in the office example, it
> cannot be done.

I don't follow your point, but I think you are reading too much into
the analogy. Obviously, an office building cannot be "copied" in a few
seconds as a software library can, so the analogy obviously cannot be
taken too far.

The locks on the doors are analogous to enforced access restrictions.
When you lease the building, you are presumably given a complete set
of keys, including master keys. The keys are analogous to the source
code, which allows you to trivially disable the access restrictions.

People like you are saying that keys are not enough. You don't want to
be bothered with keys. You want the office doors to come with no locks
on them at all, because you don't intend to lock them anyway, and
someone could possibly get locked out someday. You are saying that
locks are unnecessary because you trust your co-workers (aren't you
lucky!), and you can just put "keep-out" signs on the doors (leading
underscores).

Well, that may be reasonable for a small group of developers working
on a small, "cool" project. It is inappropriate, however, for a large,
safety-critical project with dozens or hundreds of developers that are
hired off the street in accordance with current labor laws. Now, if
you concede that Python is just not intended for such projects, then
fine, but please don't claim that access restrictions are useless for
all applications and domains. That's just ridiculous.


From noama at answers.com  Wed Feb  4 10:54:09 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 4 Feb 2009 17:54:09 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <1233761152.373.14.camel@localhost.localdomain>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>

About the hijacking - I *might* have done it without understanding what
I did (replied to a previous message and then changed the subject), if
that's what you mean...
Sorry

-----Original Message-----
From: python-list-bounces+noama=answers.com at python.org
[mailto:python-list-bounces+noama=answers.com at python.org] On Behalf Of
Albert Hopkins
Sent: Wednesday, February 04, 2009 5:26 PM
To: python-list at python.org
Subject: Re: Kill a function while it's being executed

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some
other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after
a
> certain amount of time has passed (without asking the user who's
giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a



--
http://mail.python.org/mailman/listinfo/python-list



From how at about.no.com  Wed Feb  4 10:55:32 2009
From: how at about.no.com (eviljonny)
Date: 04 Feb 2009 15:55:32 GMT
Subject: wsdl2py/ZSI and complex types with arrays
Message-ID: <4989ba74$0$24592$da0feed9@news.zen.co.uk>

Hello all,

I have been trying to write a web service using ZSI with wsdl2py. I have 
read 'The Zolera Soap Infrastructure User?s Guide Release 2.0.0' and some 
older guides (a guide by Nortel called Using ZSI with wsdl2py) and am 
unable to find any working examples of how to use arrays in complex 
types. I have a Request method which takes an array as an argument and 
responds with an array.

Assume I am just trying to write a client at this point. I have tried a 
lot of variations on this and can get a call made but using a tracefile 
the element SOIID is always empty no matter what I do.

Please excuse me if the code is not fantastic. I am very new to python.

#---------------------------------------
from GraphingReporter_services import *
from GraphingReporter_services_types import *

loc = GraphingReporterLocator()
fp = file("/tmp/PYTHON-TRACE","w")
port = loc.getGraphingReporterPort(tracefile=fp)

request = GraphRequestSOIID()
graphRequest = request.new_soiid()
graphRequest.Soiid = [123456,123457]
request.set_element_soiid(graphRequest)
response = port.GetGraphsForSOIID(request)

fp.close()
#---------------------------------------

The outgoing call in the trace shows 
#---------------------------------------
<SOAP-ENV:Body xmlns:ns1="urn:GraphingReporter">
<ns1:GetGraphsForSOIID>
<soiid></soiid>
</ns1:GetGraphsForSOIID>
</SOAP-ENV:Body>
#---------------------------------------

Can anyone provide me an example (or a link to an example) of how to 
populate the arrays in complex types? Even pointing me in the right 
direction would be wonderful.

-- 
EvilJonny


From nospam at nospam.com  Wed Feb  4 11:08:45 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Wed, 04 Feb 2009 17:08:45 +0100
Subject: [Web 2.0] Added-value of frameworks?
Message-ID: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>

Hello

If I wanted to build some social web site such as Facebook, what do
frameworks like Django or TurboGears provide over writing a site from
scratch using Python?

Thank you for your feedback.


From nospam at nospam.com  Wed Feb  4 11:11:07 2009
From: nospam at nospam.com (Gilles Ganault)
Date: Wed, 04 Feb 2009 17:11:07 +0100
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<mailman.8639.1233608458.3487.python-list@python.org>
Message-ID: <defjo4h89b144i65l3b2gvnio9nbtibor2@4ax.com>

On Mon, 2 Feb 2009 22:00:53 +0100, Martin <martin at marcher.name> wrote:
>as suggested, the DBA should seriously think about defining the
>correct type of the column here, for intermediate use and getting
>stuff to work you could use a view and define some stored procedures
>on it so that inserting properly works...

Right, but SQLite only has two types: Numeric or text, so I figured
it'd be better to turn dates into the usual YYYY-MM-DD before saving
data into an SQLite file.

Thanks for the feedback.


From tino at wildenhain.de  Wed Feb  4 11:19:13 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 04 Feb 2009 17:19:13 +0100
Subject: len()
In-Reply-To: <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org> <Q5iil.19417$8Z.6255@tornado.fastwebnet.it>
Message-ID: <4989C001.5040102@wildenhain.de>

Marco Mariani wrote:
> Pat wrote:
> 
>> Why didn't you answer the len() question?
> 
> It's a bit of a FAQ: len() cannot be a method of list objects because it 
> works on any sequence or iterable.

Thats only half of the truth :-)

len() can use some internal optimizations on certain objects
where sequences indeed have a len() method called __len__()

Regards
Tino
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From vincent at vincentdavis.net  Wed Feb  4 11:24:00 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 09:24:00 -0700
Subject: Use list name as string
Message-ID: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>

Do to laking knowledge my google searches have not turned up an answer for me.
I know this is wrong it uses the items in the list as the filename,
how do I refer to the dataname and not the items in it.

def savedata(dataname):
    filename = str(dataname)  # this does not do what I would like it to
    ext1 = '\.csv'
    flex = filename + ext1
    datawrite = csv.writer(open(flex, "wb"))
    datawrite.writerows(dataname)


Thanks
Vincent Davis


From mccredie at gmail.com  Wed Feb  4 11:30:38 2009
From: mccredie at gmail.com (Matimus)
Date: Wed, 4 Feb 2009 08:30:38 -0800 (PST)
Subject: Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <98d0397d-f707-4c09-94ad-11427d94930f@l33g2000pri.googlegroups.com>

On Feb 4, 8:08?am, Gilles Ganault <nos... at nospam.com> wrote:
> Hello
>
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?
>
> Thank you for your feedback.

Why not just look at the frameworks themselves and see what they have
to offer. Django and Turbogears both have pretty good tutorials. You
can be up and running in 20 minutes with each one. You be the judge.

The frameworks provide a lot of boilerplate code that I would rather
not write. They are probably more secure and scalable than something I
would come up with. You also get many extras for free. I think in both
of the frameworks you mention you get an administrative back end for
free. Other people have created apps/plugins that you can use with
those frameworks. So, for example, you might be able to borrow the
code to help you add a forum to your site.

I'm not sure I know the advantage of not using a framework. Unless "I
get to write more code" is an advantage. Creating your own framework
might be fun, but if you really just want a website don't do more work
than you need to.

Matt


From gherron at islandtraining.com  Wed Feb  4 11:35:32 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 04 Feb 2009 08:35:32 -0800
Subject: Use list name as string
In-Reply-To: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
Message-ID: <4989C3D4.4070303@islandtraining.com>

Vincent Davis wrote:
> Do to laking knowledge my google searches have not turned up an answer for me.
> I know this is wrong it uses the items in the list as the filename,
> how do I refer to the dataname and not the items in it.
>
> def savedata(dataname):
>     filename = str(dataname)  # this does not do what I would like it to
>     ext1 = '\.csv'
>     flex = filename + ext1
>     datawrite = csv.writer(open(flex, "wb"))
>     datawrite.writerows(dataname)
>
>   

I need more information to answer this question -- because I have no
idea what the question means.

SO:
  What is dataname?
  What would you like filename to be after that line.

One example of dataname and the desired filename is probably enough to
answer your question.
> Thanks
> Vincent Davis
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From catherine.heathcote at gmail.com  Wed Feb  4 11:47:04 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Wed, 04 Feb 2009 16:47:04 GMT
Subject: Couple of noobish question
Message-ID: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>

Firstly hi, I don't know any of you yet but am picking up Python and 
will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 
years of a comp tech degree, long story) and am learning Python, 'cos I 
saw some code and it just looks a really nice language to work with. I 
come from C++, so I am bound to trip up trying to do things the wrong way!

I have been working with Project Euler to get the hang of Python, and 
all goes well. I have an idea for a small project, an overly simplistic 
interactive fiction engine (well more like those old choose your own 
adventure books, used to love those!) that uses XML for its map files. 
The main issues I see so far is the XML parsing (I should pick that up 
ok, I have a blackbelt in google-foo), but more importantly splitting 
code files.

In C++ I would obviously split .cpp and .h files, pairing them up and 
using #include. How do I do this in Python? I see that you don't tend to 
split logic from defenition, but how do I keep different classes in 
different files? My google-fu fails me so far.


From python.list at tim.thechases.com  Wed Feb  4 11:48:16 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 10:48:16 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
Message-ID: <4989C6D0.2000604@tim.thechases.com>

> I know this is wrong it uses the items in the list as the filename,
> how do I refer to the dataname and not the items in it.

Without a sample value for "dataname", it's hard to tell what 
you're trying to do.  Do you mean

   dataname = ['path', 'to', 'file']
   ...
   filename = os.sep.join(dataname)

Or you have a list of one value, and just want its first item?

   filename = dataname[0]

> def savedata(dataname):
>	filename = str(dataname) # this does not do what I would like it to

It would help if you detailed what you *would* like it to do...

   >>> from MindReading import answer
   Traceback (most recent call last):
     File "<stdin>", line 6, in comp.lang.python
   ImportError: No module named MindReading

Similar failure attempting

   >>> import dwim

-tkc









From manu3d at gmail.com  Wed Feb  4 11:51:41 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 4 Feb 2009 08:51:41 -0800 (PST)
Subject: re.sub and named groups
Message-ID: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>

Hi everybody,

I'm having a ball with the power of regular expression but I stumbled
on something I don't quite understand:

theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
aReplacementPattern = "\(\?P<first>.*\)"
aReplacementString= "foo"
re.sub(aReplacementPattern , aReplacementString, theOriginalString)

results in :

"spam:foo"

instead, I was expecting:

"spam:foo ham:"

Why is that?

Thanks for your help!

Manu






From steve at holdenweb.com  Wed Feb  4 11:54:45 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 11:54:45 -0500
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>	<1233761152.373.14.camel@localhost.localdomain>
	<749CACF29BDFB64E9F80189ECD77868804C0072C@jermail1.atomant.net>
Message-ID: <gmch8p$kk1$1@ger.gmane.org>

Noam Aigerman wrote:
> About the hijacking - I *might* have done it without understanding what
> I did (replied to a previous message and then changed the subject), if
> that's what you mean...
> Sorry

That's what he meant. A lot of news reading and email software uses
In-Reply-To and various other message headers to determine how messages
are threaded, so (for example) in my Thunderbird Window this appears to
be a part of the thread that started out as "Locating Python".

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From vincent at vincentdavis.net  Wed Feb  4 11:57:13 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 09:57:13 -0700
Subject: Use list name as string
In-Reply-To: <4989C6D0.2000604@tim.thechases.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
Message-ID: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>

Sorry for not being clearI would have something like this
x = [1, 2, 3,5 ,6 ,9,234]

Then
def savedata(dataname): ..........

savedata(x)

this would save a to a file called x.csv This is my problem, getting the
name to be x.csv which is the same as the name of the list.

and the data in the file would be
1,2,3,5,6,9,234 this parts works

Thanks
Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 9:48 AM, Tim Chase <python.list at tim.thechases.com>wrote:

> I know this is wrong it uses the items in the list as the filename,
>> how do I refer to the dataname and not the items in it.
>>
>
> Without a sample value for "dataname", it's hard to tell what you're trying
> to do.  Do you mean
>
>  dataname = ['path', 'to', 'file']
>  ...
>  filename = os.sep.join(dataname)
>
> Or you have a list of one value, and just want its first item?
>
>  filename = dataname[0]
>
>  def savedata(dataname):
>>        filename = str(dataname) # this does not do what I would like it to
>>
>
> It would help if you detailed what you *would* like it to do...
>
>  >>> from MindReading import answer
>  Traceback (most recent call last):
>    File "<stdin>", line 6, in comp.lang.python
>  ImportError: No module named MindReading
>
> Similar failure attempting
>
>  >>> import dwim
>
> -tkc
>
>
>
>
>
>
>
>
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From kyosohma at gmail.com  Wed Feb  4 12:05:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 4 Feb 2009 09:05:16 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>

On Feb 4, 10:47?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> Firstly hi, I don't know any of you yet but am picking up Python and
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
> years of a comp tech degree, long story) and am learning Python, 'cos I
> saw some code and it just looks a really nice language to work with. I
> come from C++, so I am bound to trip up trying to do things the wrong way!
>
> I have been working with Project Euler to get the hang of Python, and
> all goes well. I have an idea for a small project, an overly simplistic
> interactive fiction engine (well more like those old choose your own
> adventure books, used to love those!) that uses XML for its map files.
> The main issues I see so far is the XML parsing (I should pick that up
> ok, I have a blackbelt in google-foo), but more importantly splitting
> code files.
>
> In C++ I would obviously split .cpp and .h files, pairing them up and
> using #include. How do I do this in Python? I see that you don't tend to
> split logic from defenition, but how do I keep different classes in
> different files? My google-fu fails me so far.

You just use the keyword "import". Here's a goofy example:

1) foo.py contains a class called Foo
2) bar.py contains a script that imports Foo:

import foo

# create an instance of the Foo class
myFoo = foo.Foo()


I hope that was clear.

Mike


From google at mrabarnett.plus.com  Wed Feb  4 12:07:19 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:07:19 +0000
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <4989CB47.3060806@mrabarnett.plus.com>

Vincent Davis wrote:
 > Sorry for not being clear I would have something like this x = [1, 2,
 > 3,5 ,6 ,9,234]
 >
 > Then def savedata(dataname): ..........
 >
 > savedata(x)
 >
 > this would save a to a file called x.csv This is my problem, getting
 > the name to be x.csv which is the same as the name of the list.
 >
 > and the data in the file would be 1,2,3,5,6,9,234 this parts works
 >
The list itself doesn't have a name. You need to pass in both the name
and the list:

def savedata(name, data): ..........

savedata("x", x)


From catherine.heathcote at gmail.com  Wed Feb  4 12:09:54 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Wed, 04 Feb 2009 17:09:54 GMT
Subject: Couple of noobish question
In-Reply-To: <c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<c4661bd1-dfb2-454f-a062-b4366ad1311c@i18g2000prf.googlegroups.com>
Message-ID: <CZjil.30234$Sp5.22514@text.news.virginmedia.com>

Mike Driscoll wrote:
> On Feb 4, 10:47 am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> Firstly hi, I don't know any of you yet but am picking up Python and
>> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
>> years of a comp tech degree, long story) and am learning Python, 'cos I
>> saw some code and it just looks a really nice language to work with. I
>> come from C++, so I am bound to trip up trying to do things the wrong way!
>>
>> I have been working with Project Euler to get the hang of Python, and
>> all goes well. I have an idea for a small project, an overly simplistic
>> interactive fiction engine (well more like those old choose your own
>> adventure books, used to love those!) that uses XML for its map files.
>> The main issues I see so far is the XML parsing (I should pick that up
>> ok, I have a blackbelt in google-foo), but more importantly splitting
>> code files.
>>
>> In C++ I would obviously split .cpp and .h files, pairing them up and
>> using #include. How do I do this in Python? I see that you don't tend to
>> split logic from defenition, but how do I keep different classes in
>> different files? My google-fu fails me so far.
> 
> You just use the keyword "import". Here's a goofy example:
> 
> 1) foo.py contains a class called Foo
> 2) bar.py contains a script that imports Foo:
> 
> import foo
> 
> # create an instance of the Foo class
> myFoo = foo.Foo()
> 
> 
> I hope that was clear.
> 
> Mike

Perfect, thanks ^^


From google at mrabarnett.plus.com  Wed Feb  4 12:17:54 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:17:54 +0000
Subject: re.sub and named groups
In-Reply-To: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <4989CDC2.7010001@mrabarnett.plus.com>

Emanuele D'Arrigo wrote:
 > Hi everybody,
 >
 > I'm having a ball with the power of regular expression but I stumbled
 > on something I don't quite understand:
 >
 > theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
 > aReplacementPattern = "\(\?P<first>.*\)"
 > aReplacementString= "foo"
 > re.sub(aReplacementPattern , aReplacementString, theOriginalString)
 >
 > results in :
 >
 > "spam:foo"
 >
 > instead, I was expecting:
 >
 > "spam:foo ham:"
 >
 > Why is that?
 >
 > Thanks for your help!
 >
The quantifiers eg "*" are normally greedy; they try to match as much as
possible. Therefore ".*" matches:

spam:(?P<first>.*) ham:(?P<second>.*)
                ^^^^^^^^^^^^^^^^^^^^^

You could use the lazy form "*?" which tries to match as little as
possible, eg "\(\?P<first>.*?\)" where the ".*?" matches:

spam:(?P<first>.*) ham:(?P<second>.*)
                ^^

giving "spam:foo ham:(?P<second>.*)".


From vincent at vincentdavis.net  Wed Feb  4 12:18:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:18:49 -0700
Subject: Use list name as string
In-Reply-To: <4989CB47.3060806@mrabarnett.plus.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
Message-ID: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>

I know nothing but that sucks. I can think of a lot of times I would like to
do something similar. There really is no way to do this, it seems like there
would be some simple way kind of like str(listname) but backwards or
different.
Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:

> Vincent Davis wrote:
> > Sorry for not being clear I would have something like this x = [1, 2,
> > 3,5 ,6 ,9,234]
> >
> > Then def savedata(dataname): ..........
> >
> > savedata(x)
> >
> > this would save a to a file called x.csv This is my problem, getting
> > the name to be x.csv which is the same as the name of the list.
> >
> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
> >
> The list itself doesn't have a name. You need to pass in both the name
> and the list:
>
> def savedata(name, data): ..........
>
> savedata("x", x)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From manu3d at gmail.com  Wed Feb  4 12:23:45 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Wed, 4 Feb 2009 09:23:45 -0800 (PST)
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<mailman.8785.1233767871.3487.python-list@python.org>
Message-ID: <97ab8831-97ab-4d05-8fd3-90ac17f04bd1@x16g2000prn.googlegroups.com>

On Feb 4, 5:17?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> You could use the lazy form "*?" which tries to match as little as
> possible, eg "\(\?P<first>.*?\)" where the ".*?" matches:
> spam:(?P<first>.*) ham:(?P<second>.*)
> giving "spam:foo ham:(?P<second>.*)".

A-ha! Of course! That makes perfect sense! Thank you! Problem solved!

Ciao!

Manu



From vincent at vincentdavis.net  Wed Feb  4 12:23:55 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:23:55 -0700
Subject: Use list name as string
In-Reply-To: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
Message-ID: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>

I guess what I am saying is that it does not seem like I am adding any
information that is not already there when I have to enter that list and
list name after all they are the same.
Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I know nothing but that sucks. I can think of a lot of times I would like
> to do something similar. There really is no way to do this, it seems like
> there would be some simple way kind of like str(listname) but backwards or
> different.
> Thanks
> Vincent Davis
>
>
>
>
> On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>> > Sorry for not being clear I would have something like this x = [1, 2,
>> > 3,5 ,6 ,9,234]
>> >
>> > Then def savedata(dataname): ..........
>> >
>> > savedata(x)
>> >
>> > this would save a to a file called x.csv This is my problem, getting
>> > the name to be x.csv which is the same as the name of the list.
>> >
>> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
>> >
>> The list itself doesn't have a name. You need to pass in both the name
>> and the list:
>>
>> def savedata(name, data): ..........
>>
>> savedata("x", x)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From gherron at islandtraining.com  Wed Feb  4 12:26:28 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 04 Feb 2009 09:26:28 -0800
Subject: Couple of noobish question
In-Reply-To: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <4989CFC4.6090305@islandtraining.com>

Catherine Heathcote wrote:
> Firstly hi, I don't know any of you yet but am picking up Python and
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4
> years of a comp tech degree, long story) and am learning Python, 'cos
> I saw some code and it just looks a really nice language to work with.
> I come from C++, so I am bound to trip up trying to do things the
> wrong way!

Welcome.  I suspect you'll enjoy Python.  (Far more than C++ ).
>
> I have been working with Project Euler to get the hang of Python, and
> all goes well. I have an idea for a small project, an overly
> simplistic interactive fiction engine (well more like those old choose
> your own adventure books, used to love those!) that uses XML for its
> map files. The main issues I see so far is the XML parsing (I should
> pick that up ok, I have a blackbelt in google-foo), but more
> importantly splitting code files.

Several modules exits to do the parsing of XML:  elementtree, xml, and
beautifulsoup come to mind immediately.
>
> In C++ I would obviously split .cpp and .h files, pairing them up and
> using #include. How do I do this in Python? I see that you don't tend
> to split logic from defenition, but how do I keep different classes in
> different files? My google-fu fails me so far.

Use the import statement for this.

If file a.py defines some classes or functions
a.py:
  class UsefulClass:
    ...
  def UsefulFn(...):
    ...

Then your main Python file imports it and uses the things define in a.py
like this:
  import a
  ob = UsefulClass(...)
  a.UsefulFn()

Good luck,

Gary Herron


> -- 
> http://mail.python.org/mailman/listinfo/python-list



From vincent at vincentdavis.net  Wed Feb  4 12:31:38 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 10:31:38 -0700
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>

can I do it the otherway, that issavedata('nameoflist')


Thanks
Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 10:23 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I guess what I am saying is that it does not seem like I am adding any
> information that is not already there when I have to enter that list and
> list name after all they are the same.
> Thanks
> Vincent Davis
>
>
>
>
> On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis <vincent at vincentdavis.net>wrote:
>
>> I know nothing but that sucks. I can think of a lot of times I would like
>> to do something similar. There really is no way to do this, it seems like
>> there would be some simple way kind of like str(listname) but backwards or
>> different.
>> Thanks
>> Vincent Davis
>>
>>
>>
>>
>> On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com> wrote:
>>
>>> Vincent Davis wrote:
>>> > Sorry for not being clear I would have something like this x = [1, 2,
>>> > 3,5 ,6 ,9,234]
>>> >
>>> > Then def savedata(dataname): ..........
>>> >
>>> > savedata(x)
>>> >
>>> > this would save a to a file called x.csv This is my problem, getting
>>> > the name to be x.csv which is the same as the name of the list.
>>> >
>>> > and the data in the file would be 1,2,3,5,6,9,234 this parts works
>>> >
>>> The list itself doesn't have a name. You need to pass in both the name
>>> and the list:
>>>
>>> def savedata(name, data): ..........
>>>
>>> savedata("x", x)
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>
>>
>
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From cjw at ncf.ca  Wed Feb  4 12:32:41 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Wed, 04 Feb 2009 12:32:41 -0500
Subject: Date Comparison
In-Reply-To: <gm9idp02h1t@news4.newsguy.com>
References: <2806523d-bba6-48e4-b23f-c27e069f00b8@o40g2000yqb.googlegroups.com>
	<gm9idp02h1t@news4.newsguy.com>
Message-ID: <gmcjfs$63m$1@theodyn.ncf.ca>

Bill McClain wrote:
> On 2009-02-03, mohana2004 at gmail.com <mohana2004 at gmail.com> wrote:
>> Hi,
>> I need to compare two dates and find the number of days between those
>> two dates.This can be done with datetime module in python  as below,
>> but this is not supported in Jython.
> 
> There are julian day routines in this astronomy package:
> 
>     http://astrolabe.sourceforge.net/
and in Mark Lemburg's mxDate

Colin W.
> 
> -Bill


From python.list at tim.thechases.com  Wed Feb  4 12:35:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 11:35:29 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
Message-ID: <4989D1E1.8090008@tim.thechases.com>

> I know nothing but that sucks. I can think of a lot of times I would like to
> do something similar. There really is no way to do this, it seems like there
> would be some simple way kind of like str(listname) but backwards or
> different.

Python does the only reasonable thing:  doesn't give you access 
to the "name".  Consider the following situation:

   a = [1,2,3,4,5]
   b = a

   savedata(b)

Do you want "a" or "b" as the variable-name?  Both are valid 
names for the same list.

If it matters, you can do something like this hack:

   def savedata(**kwargs):
     assert len(kwargs) == 1, "Just pass one parameter"
     filename, data = kwargs.iteritems().next()
     ext1 = '\.csv'
     flex = filename + ext1
     datawrite = csv.writer(open(flex, "wb"))
     datawrite.writerows(data)

which can then be called with something like

   savedata(foo=[1,2,3,4,5])
   savedata(bar=a)
   savedata(name=name)

to create "foo.csv" containing that data.

Or you could just pass it explicitly which would make more sense 
and be easier to understand.

-tkc






From sebastien.yapo at free.fr  Wed Feb  4 12:36:56 2009
From: sebastien.yapo at free.fr (=?ISO-8859-1?Q?Yapo_S=E9bastien?=)
Date: Wed, 04 Feb 2009 18:36:56 +0100
Subject: re.sub and named groups
In-Reply-To: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <4989D238.6000702@free.fr>


> Hi everybody,
>
> I'm having a ball with the power of regular expression but I stumbled
> on something I don't quite understand:
>
> theOriginalString = "spam:(?P<first>.*) ham:(?P<second>.*)"
> aReplacementPattern = "\(\?P<first>.*\)"
> aReplacementString= "foo"
> re.sub(aReplacementPattern , aReplacementString, theOriginalString)
>
> results in :
>
> "spam:foo"
>
> instead, I was expecting:
>
> "spam:foo ham:"
>
> Why is that?
>
> Thanks for your help!
>
> Manu
>
>   
I think that .* in your replacement pattern matches ".*)
ham:(?P<second>.*" in your original string which seems correct for a regexp.
Perhaps you should try aReplacementPattern = "\(\?P<first>\.\*\)" or use
replace() since your replacement pattern is not a regexp anymore.

Sebastien


From python.list at tim.thechases.com  Wed Feb  4 12:46:13 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 11:46:13 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<77e831100902040931t76eb7d11la93fcd840c866b5e@mail.gmail.com>
Message-ID: <4989D465.6070402@tim.thechases.com>

> can I do it the otherway, that issavedata('nameoflist')

for limited cases where your variable is defined globally, you 
can use:

   >>> a = [1,2,3,4]
   >>> def save(s):
   ...     print globals().get(s, "UNDEFINED")
   ...
   >>> save("a")
   [1, 2, 3, 4]
   >>> save("b")
   UNDEFINED
   >>> b = (6,5,4,3)
   >>> save("b")
   (6, 5, 4, 3)

However, it's a hideous hack, and fragile as demonstrated by

   >>> x = 7000
   >>> def baz():
   ...     x = (7,8,9) # this isn't in save()'s globals()
   ...     save("x")
   ...
   >>> baz()
   7000
   >>> x = 8000
   >>> baz()
   8000

and using locals() doesn't help either:

   print locals().get(s, globals().get(s, "UNDEFINED"))

and has even weirder (but totally understandable) behavior:

   >>> save("s")  # "s" hasn't been defined in globals()
   's'

Just pass the filename as a string, and skip trying to sniff 
internal variable-names.  Or you'll experience a world of headaches.

-tkc






From google at mrabarnett.plus.com  Wed Feb  4 12:49:57 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 17:49:57 +0000
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <4989D545.4030409@mrabarnett.plus.com>

Vincent Davis wrote:
> I guess what I am saying is that it does not seem like I am adding
> any information that is not already there when I have to enter that
> list and list name after all they are the same.
> 
If you write:

y = x

then both x and y refer to the same list.

The actual names of the variables and functions shouldn't matter to the
outside world; the name of an output file shouldn't depend on the name
of a variable.

 > On Wed, Feb 4, 2009 at 10:18 AM, Vincent Davis
 > <vincent at vincentdavis.net <mailto:vincent at vincentdavis.net>> wrote:
 >
 >     I know nothing but that sucks. I can think of a lot of times I
 >     would like to do something similar. There really is no way to do
 >     this, itseems like there would be some simple way kind of like
 >     str(listname)but backwards or different.
 >
 >     On Wed, Feb 4, 2009 at 10:07 AM, MRAB <google at mrabarnett.plus.com
 >     <mailto:google at mrabarnett.plus.com>> wrote:
 >
 >         Vincent Davis wrote:
 >          > Sorry for not being clear I would have something like this
 >          x = [1, 2, 3,5 ,6 ,9,234]
 >          >
 >          > Then def savedata(dataname): ..........
 >          >
 >          > savedata(x)
 >          >
 >          > this would save a to a file called x.csv This is my
 >          > problem,getting the name to be x.csv which is the same as
 >          > the name of the list.
 >          >
 >          > and the data in the file would be 1,2,3,5,6,9,234 this
 >          >  parts works
 >          >
 >         The list itself doesn't have a name. You need to pass in both
 >         the name and the list:
 >
 >         def savedata(name, data): ..........
 >
 >         savedata("x", x)
 >


From rdmurray at bitdance.com  Wed Feb  4 13:12:48 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 4 Feb 2009 18:12:48 +0000 (UTC)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <gmclr0$650$1@ger.gmane.org>

Quoth Catherine Heathcote <catherine.heathcote at gmail.com>:
> all goes well. I have an idea for a small project, an overly simplistic 
> interactive fiction engine (well more like those old choose your own 
> adventure books, used to love those!) that uses XML for its map files. 
> The main issues I see so far is the XML parsing (I should pick that up 
> ok, I have a blackbelt in google-foo), but more importantly splitting 

Others have answered your other question, but I thought I'd mention
that you will probably want to take a look at the ElementTree module.

--RDM



From shiningsandy at gmail.com  Wed Feb  4 13:27:26 2009
From: shiningsandy at gmail.com (sandeep)
Date: Wed, 4 Feb 2009 10:27:26 -0800 (PST)
Subject: Running CVSNT commands from python to Automate the job
Message-ID: <e4b7e815-9e87-4af0-afe9-60148345a938@35g2000pry.googlegroups.com>

Hi All,

i want to automate my task for of doing cvs checkout for different
modules. I am on Windows XP and i am using Python 2.6. here is my
attched python code. The thing is when i am running this nothing is
happening. I am not sure at which end the problem is. am i giving
wrong parameters or what? any help or pointers to write directions
will be helpfull.

CVS_PATH='C:\Program Files\CVSNT\cvs.exe'
CVS_PATH=(os.sep).join(CVS_PATH.split('\\'))
BRANCH_NAME='B_PKG14_01'
'''

Filters the directories only from the list of files
and directories excluding the directories starting with name '.'
@param dirList=List of all the files and directories
@param basePath=path where we are doing our filtering

'''
def filterDir(dirList,basePath):
    import os
    temp=[]
    for data in dirList:
        #if(data[0]!='.'):
        mydir=os.path.join(basePath,data)
        flag=os.path.isdir(mydir)
        if(flag==True):
            temp.append(mydir)
    return temp

def main():
    import os

    curr_dir=os.getcwd()#current working directory
    curr_list=os.listdir(curr_dir)#list of all files and directories
in current working directory
    global CVS_PATH,BRANCH_NAME
    temp=filterDir(curr_list,curr_dir)

    for mydir in temp:
        dir_name=os.path.split(mydir)[1]
        #os.rmdir(mydir)
        CVS_COMMAND='checkout -r '+BRANCH_NAME+' -P '+dir_name
        print '"'+CVS_PATH+'"'+' -q '+CVS_COMMAND

main()



thanks,
sandeep


From james at agentultra.com  Wed Feb  4 13:36:12 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 04 Feb 2009 18:36:12 +0000
Subject: Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
	<98d0397d-f707-4c09-94ad-11427d94930f@l33g2000pri.googlegroups.com>
Message-ID: <878wom6odf.fsf@agentultra.com>

Matimus <mccredie at gmail.com> writes:

> On Feb 4, 8:08?am, Gilles Ganault <nos... at nospam.com> wrote:
>> Hello
>>
>> If I wanted to build some social web site such as Facebook, what do
>> frameworks like Django or TurboGears provide over writing a site from
>> scratch using Python?
>>
>> Thank you for your feedback.
>
> Why not just look at the frameworks themselves and see what they have
> to offer. Django and Turbogears both have pretty good tutorials. You
> can be up and running in 20 minutes with each one. You be the judge.
>
> The frameworks provide a lot of boilerplate code that I would rather
> not write. They are probably more secure and scalable than something I
> would come up with. You also get many extras for free. I think in both
> of the frameworks you mention you get an administrative back end for
> free. Other people have created apps/plugins that you can use with
> those frameworks. So, for example, you might be able to borrow the
> code to help you add a forum to your site.
>
> I'm not sure I know the advantage of not using a framework. Unless "I
> get to write more code" is an advantage. Creating your own framework
> might be fun, but if you really just want a website don't do more work
> than you need to.
>
> Matt

In other words, it boils down to what you get paid to do.

If you're being paid for a frob (the product, in this case a website)
then you use a frob-maker (a framework).

If you're being paid to make frobs, then you make the frob-maker.

Most frob-makers are good at producing frobs of a certain kind. Just
choose the frob-maker that makes the frobs you need.

In rare circumstances you'll need a really customized frob. Call on me
when you get there. ;)


From gagsl-py2 at yahoo.com.ar  Wed Feb  4 13:50:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 16:50:17 -0200
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>
	<gm254n$14l$1@aioe.org> <20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>
Message-ID: <op.uoubx3bxx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 12:38:04 -0200, Pat <Pat at junk.net> escribi?:
> Andreas Waldenburger wrote:
>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>> Tobiah wrote:
>>>> Just out of curiosity, why was len() made to
>>>> be it's own function?  I often find myself
>>>> typing things like my_list.len before I
>>>> catch myself.

>>> I'm surprised that no one responded to that question.
>>>
>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>> Might it be that your newsserver is a bit laggy?
>
> Might be laggy.  Who knows.
> Why didn't you answer the len() question?

Why should he? Why didn't you look for the answer yourself, after being  
told that it existed? Why do you expect *us* to repeat ourselves again and  
again? Don't be so lazy...

You can read all these posts using the mailing list  
(python-list at python.org), Usenet (comp.lang.python), Google Groups, and  
many other mirrors. See this same thread in 3 different ways:

Google groups:
http://groups.google.com/group/comp.lang.python/t/247ec641c289a326/

Gmane:
http://permalink.gmane.org/gmane.comp.python.general/608346

Python.org:
http://mail.python.org/pipermail/python-list/2009-January/526500.html

and many others, like the "forum" look & feel provided by  
www.velocityreviews.com

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb  4 13:57:55 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 04 Feb 2009 16:57:55 -0200
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org> <018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<mailman.8584.1233564941.3487.python-list@python.org>
	<67d8a4d2-0b3d-4b41-84e2-698f17cb8e88@35g2000pry.googlegroups.com>
	<26a3c05c-253d-4134-bcb9-aed8505f250e@e1g2000pra.googlegroups.com>
	<mailman.8728.1233694656.3487.python-list@python.org>
	<49895a45$0$16900$426a74cc@news.free.fr>
Message-ID: <op.uoucatxlx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 04 Feb 2009 07:05:22 -0200, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> escribi?:
> Gabriel Genellina a ?crit :
>> En Mon, 02 Feb 2009 19:51:11 -0200, Russ P. <Russ.Paielli at gmail.com>  
>> escribi?:
>>
>>> Suppose a library developer (or a module developer on a large team)
>>> uses leading underscores. Now suppose that, for whatever reason
>>> (pressure from the users, perhaps), the library developer decides to
>>> change a "private" attribute to public. Now all occurrences of the
>>> identifier need to be changed. If an assignment to the previously
>>> "private" attribute is missed, no warning will be issued (because
>>> Python allows new attributes to be added anywhere, even completely
>>> outside the class definition itself). And if the library is widely
>>> used, the probability of such bugs occurring is very high.
>>  So _foo becomes foo. Then:
>>  class X(object):
>>     def get_foo(self): return self._foo
>>     def set_foo(self, value): self._foo = value
>>     foo = property(get_foo, set_foo)
>
>
> FWIW, if there's no other need for the property, I'd do it the other way  
> round : directly make foo a plain attribute, and add a _foo property  
> whose accessors would raise a deprecation warning. Then there's no  
> chance I miss a an assignement to _foo !-)

Yes, that would be better. In any case, one has both static analysis tools  
(e.g. pylint) and dynamic warnings (like you said above) so I don't see a  
problem here.

-- 
Gabriel Genellina



From tjreedy at udel.edu  Wed Feb  4 14:06:33 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 14:06:33 -0500
Subject: is python Object oriented??
In-Reply-To: <01a901c9869c$628e8fa0$0d00a8c0@hendrik>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com><bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com><mailman.8395.1233347525.3487.python-list@python.org><0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com><mailman.8483.1233433642.3487.python-list@python.org><b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com><6ul2ieFg1sraU1@mid.uni-berlin.de><73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com><gm4rl1$21r$1@ger.gmane.org><018801c9850e$3e019fe0$0d00a8c0@hendrik><7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com><mailman.8596.1233574041.3487.python-list@python.org><6uo5koFg8q28U1@mid.uni-berlin.de><mailman.8610.1233588630.3487.python-list@python.org>	<6uoqvrFgh5oeU1@mid.uni-berlin.de><mailman.8682.12336484
	28.3487.python-list@python.org>	<Qc2dnU8DSeHj8RXUnZ2dnUVZ_rXinZ2d@pdx.net>
	<01a901c9869c$628e8fa0$0d00a8c0@hendrik>
Message-ID: <gmcovl$hmj$1@ger.gmane.org>

Hendrik van Rooyen wrote:
> "Scott David Daniels" <S...els at Acm.Org> wrote:
> 
>> You might enjoy looking at QNX, since I think it is built along the
>> lines you are describing here.  I have an ancient copy of their OS,
>> but haven't followed for more than couple of decades.
> 
> I vaguely know about it, and I know they claim to be hot on 
> real time stuff.  I have never pursued it in any depth because
> of the real tiny nature of the processors I have been working
> with (8031).
> 
> When I had a cursory look at it a long time ago, it seemed
> to be almost unix like in its make up, and I doubted that
> I could persuade it to run on of them. (I may be dead 
> wrong of course - I don't know)
> 
> I will put it on my list of stuff to try to get done.  

Slightly OT: QNX was open-sourced, at least for non-commercial use, a 
little more that a year ago.  So it might be worth a new look.



From tjreedy at udel.edu  Wed Feb  4 14:11:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 04 Feb 2009 14:11:20 -0500
Subject: len()
In-Reply-To: <gmc979$b9r$1@aioe.org>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>
Message-ID: <gmcp8k$hmj$2@ger.gmane.org>

Pat wrote:
> Andreas Waldenburger wrote:
>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>
>>> Tobiah wrote:
>>>> Just out of curiosity, why was len() made to
>>>> be it's own function?  I often find myself
>>>> typing things like my_list.len before I
>>>> catch myself.
>>>>
>>>> Thanks,
>>>>
>>>> Toby
>>> I'm surprised that no one responded to that question.
>>>
>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>> Might it be that your newsserver is a bit laggy?
>>
>> regards
>> /W
>>
> 
> Might be laggy.  Who knows.
> 
> Why didn't you answer the len() question?

I didn't respond because it has been asked and answered before, so the 
answer can be found in the google archives or even maybe the FAQ.



From digitig at gmail.com  Wed Feb  4 14:18:25 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 19:18:25 +0000
Subject: sys.float_info.epsilon
Message-ID: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>

I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
and I'm puzzled by some of his uses of sys.float_info.epsilon. I
appreciate the issues of comparing floating point numbers, but I'm
puzzled by code like:
    ...
    x = float(input(msg))
    if abs(x) < sys.float_info.epsilon:
        ...

What could the float() conversion return that would give different results for:
    if abs(x) < sys.float_info.epsilon
and (to my mind, more obvious):
    if abs(x) == 0.0

I didn't realise that float() could return anything with an absolute
value less than sys.float_value.epsilon other than 0.0 (which I think
all representations can represent exactly).  What am I missing here?

-- 
Tim Rowe


From bockman at virgilio.it  Wed Feb  4 14:33:10 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Wed, 04 Feb 2009 20:33:10 +0100
Subject: Tkinter
In-Reply-To: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
Message-ID: <4989ed76$0$1117$4fafbaef@reader1.news.tin.it>

Luke ha scritto:
> Hello, I'm an inexperienced programmer and I'm trying to make a
> Tkinter window and have so far been unsuccessful in being able to
> delete widgets from the main window and then add new ones back into
> the window without closing the main window.
> 
> The coding looks similar to this:
> 
...


> It may just be bad coding but either way I could use some help.
> 
> Thanks


I fixed your code to do what you want, although I have no idea why you 
want it...

The main change is that you need to place the code to be executed when 
the button is clicked in a different function, and use the name of that
function as value of the on_command property of the button. Then you 
need to give back the control to Tkinter, calling the mainloop function
and when the button is clicked, your function is called.
This sort of ping-pong is called event-driven programming, and it is how 
most GUI toolkit work. The functions called when a GUI event occurs are 
called callbacks.

A secondary thing is that since both the main function and the callback 
read and change some 'variable' pointing to the widgets, you need to 
share them using python 'global' statement. Now, a better way to do it
would be incapsulate all in a class, but I wanted to stay as much as 
possible close to your code.

Finally, if you plan to to something that requires to dynamically create 
and destroy - or move arounds - graphical objects (not widgets), you 
might want to  have a look to the 'Canvas' widget.

Code follows after signature. Since the frame and the button are 
recreated just after having been destroyed, you just see them flicker.

Ciao
----
FB


--------------------------------------------

#
# Module-level variables referring to widgets
# used/changed by more than one function
#
back_ground = None
frame1 = None


def make_frame_and_button():
     global frame1, back_ground
     print 'background', back_ground
     frame1=Frame(back_ground,width=213,height=480,bg='white')
     print 'Frame1',  frame1
     frame1.pack_propagate(0)
     frame1.pack(side=TOP,anchor=N)
     frame1.pack_propagate(0)
     frame1.pack(side=TOP,anchor=N)
     close_frame1=Button(frame1,text='close', bg='blue',
                         command=on_close_button )
     print 'close_frame1', close_frame1
     close_frame1.pack_propagate(0)
     close_frame1.pack(side=TOP, anchor=N,pady=25)


def on_close_button():
     global frame1
     frame1.destroy()
     make_frame_and_button()


def MainWin():
     global back_ground, frame1
     main=Tk()
     main.geometry('640x480')
     back_ground=Frame(main,width=640,height=480,bg='black')
     back_ground.pack_propagate(0)
     back_ground.pack(side=TOP,anchor=N)
     make_frame_and_button()
     main.mainloop()


MainWin()


From martin at v.loewis.de  Wed Feb  4 14:37:21 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 04 Feb 2009 20:37:21 +0100
Subject: x64 speed
In-Reply-To: <mailman.8707.1233682582.3487.python-list@python.org>
References: <mailman.8707.1233682582.3487.python-list@python.org>
Message-ID: <4989ee71$0$3356$9b622d9e@news.freenet.de>

> Is it the
> x64 working faster at its design sizes

Another guess (still from the darkness of not having received the
slightest clue what the test actually does): if it creates integers
in range(2**32, 2**64), then they fit into a Python int on AMD64-Linux,
but require a Python long on 32-bit Windows; long operations are much
slower than int operations.

Regards,
Martin


From Scott.Daniels at Acm.Org  Wed Feb  4 14:37:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 11:37:43 -0800
Subject: Tkinter
In-Reply-To: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
Message-ID: <gcidnWzqds6EcxTUnZ2dnUVZ_oOdnZ2d@pdx.net>

Luke wrote:
> Hello, I'm an inexperienced programmer and I'm trying to make a
> Tkinter window and have so far been unsuccessful in being able to
> delete widgets from the main window and then add new ones back into
> the window without closing the main window.
> 
> The coding looks similar to this:
> ...
> from Tkinter import *
> def MainWin():
>     main=Tk()
>     ...
>     close_frame1=Button(frame1,text='close',bg='light gray',
> command=frame1.destroy)
>     close_frame1.pack_propagate(0)
>     close_frame1.pack(side=TOP, anchor=N,pady=25)
>     if frame1.destroy==True:
>         frame1=Frame(back_ground,width=213,height=480,bg='white')
>         frame1.pack_propagate(0)
>         frame1.pack(side=TOP,anchor=N)
>     main.mainloop()
> MainWin()
> 
> It may just be bad coding but either way I could use some help.


I'll tell you what I find helps me in exploring Tkinter: running
Idle in the "no-subprocesses" mode.  Now the resulting system _is_
less stable and may well require you to restart from time to time,
but there is a compensation: you can see the effect of each
operation as you do it by hand, as well as checking expressions:

If in Windows:
     run cmd
     C:\> python -m idlelib.idle -n

If in Linux / MacOSx:
     Start a terminal:
     $ python  -m idlelib.idle -n &

Once idle shows up,
     >>> import Tkinter
     >>> main = Tkinter.Tk()
<a window shows up>
       ...

Following through your code, you'll see you start the frame,
add the button, and, immediately after getting everything set
up, you check:
 >     if frame1.destroy==True:
Which it will never be (frame1.destroy is a method, not data).
Once you get the base set up, your code should runfrom events.

So, to get a single step farther:
At the top of the MainWin function, insert:
     global frame1, close_frame1
Replace your "close_frame1 =" line down to end-o-function with:
     def on_click():
         global frame1, close_frame1
         frame1.destroy()
         frame1 =Frame(back_ground,width=213,height=480,bg='white')
         frame1.pack_propagate(0)
         frame1.pack(side=TOP,anchor=N)
         close_frame1 = Button(frame1,text='retry', bg='light blue',
                               command=on_click)
         close_frame1.pack_propagate(0)
         close_frame1.pack(side=TOP, anchor=N,pady=25)
     close_frame1 = Button(frame1,text='close',bg='light gray',
                                     command=on_click)
     close_frame1.pack_propagate(0)
     close_frame1.pack(side=TOP, anchor=N,pady=25)

The "global" lines are needed so that on_click and MainWin (which both
set the two names) are talking about the same objects.

--Scott David Daniels
Scott.Daniels at Acm.Org


From thmpsn.m.k at gmail.com  Wed Feb  4 14:49:32 2009
From: thmpsn.m.k at gmail.com (thmpsn.m.k at gmail.com)
Date: Wed, 4 Feb 2009 11:49:32 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com> 
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik> <gm6qoc$v0g$1@ger.gmane.org> 
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org> 
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com> 
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<49895bad$0$28683$426a74cc@news.free.fr>
Message-ID: <5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>

On Feb 4, 3:11?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> thmpsn.... at gmail.com a ?crit :
>
>
>
> > On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
> (snip)
> >> after all, we have used FILE* for years and I have no idea about the FILE
> >> structure.
>
> > Your lack of knowledge about it doesn't mean that it has somehow
> > magically "private" members. The only reason that most of us don't
> > know what a FILE is is that it's definition is implementation-defined
> > (i.e., every compiler may define it differently).
>
> > That doesn't have anything to do with private members. For example, on
> > my system, <stdio.h> defines FILE as:
>
> > struct _iobuf {
> > ? ? ? ? char *_ptr;
> > ? ? ? ? int ? _cnt;
> > ? ? ? ? char *_base;
> > ? ? ? ? int ? _flag;
> > ? ? ? ? int ? _file;
> > ? ? ? ? int ? _charbuf;
> > ? ? ? ? int ? _bufsiz;
> > ? ? ? ? char *_tmpfname;
> > ? ? ? ? };
>
> Didn't you notice kind of a pattern here ?

You mean the leading underscores? I don't think they're used for the
same purpose as in Python. In C/C++, identifiers that begin with an
underscore are reserved (at least at the outer level). Thus, if the
member '_ptr' would instead be named 'ptr', something like this would
break things:

#define ptr // OOPS!!
#include <stdio.h>

That shouldn't happen with '_ptr', since programs are not supposed to
define those kinds of names (yeah, right).

> > typedef struct _iobuf FILE;
>
> > Given this information, nothing prevents me from writing things like:
>
> > FILE* fp = fopen("file.txt", "r");
> > if (!fp) { /* do something */ }
>
> > printf("fp->_cnt = %d\n", fp->cnt);
> > printf("fp->_flag = %d\n", fp->_flag);
> > printf("fp->_file = %d\n", fp->_file);
>
> > fp->_flag = 0x20; // OOPS!!
>
> Indeed - and that's exactly the point : nothing prevents you from
> accessing the implementation, *and yet, you don't*

I sure don't, but I still *can*.

CHAOS MAY ENSUE!!



From Scott.Daniels at Acm.Org  Wed Feb  4 14:52:11 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 11:52:11 -0800
Subject: sys.float_info.epsilon
In-Reply-To: <mailman.8799.1233775108.3487.python-list@python.org>
References: <mailman.8799.1233775108.3487.python-list@python.org>
Message-ID: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>

Tim Rowe wrote:
> I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
> and I'm puzzled by some of his uses of sys.float_info.epsilon. I
> appreciate the issues of comparing floating point numbers, but I'm
> puzzled by code like:
>     ...
>     x = float(input(msg))
>     if abs(x) < sys.float_info.epsilon:
>         ...
> 
> What could the float() conversion return that would give different results for:
>     if abs(x) < sys.float_info.epsilon
> and (to my mind, more obvious):
>     if abs(x) == 0.0
> 
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly).  What am I missing here?
> 

You are missing the whole thing that mes floating point tricky.
I _believe_ that the epsilon is the smallest positive x such that
    1.0 != 1.0 + x
That doesn't mean that x is the smallest representable. for example,
    .0125 + epsilon / 4 != .0125

To avoid using epsilon, do something like:
     if 1 + abs(x) != 1:

To learn a bit more, look into numerical analysis -- there is a whole
field dedicated to figuring out how to make floating point behave a
little bit like real numbers.  The reason it is tough is that addition
is not associative in real numbers, and associativity is at the core
of a lot of proofs in arithmetic (and group theory).

--Scott David Daniels
Scott.Daniels at Acm.Org


From dickinsm at gmail.com  Wed Feb  4 14:57:20 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 4 Feb 2009 11:57:20 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org>
Message-ID: <42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>

On Feb 4, 7:18?pm, Tim Rowe <digi... at gmail.com> wrote:
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly). ?What am I missing here?

There are many positive floating-point values smaller than
sys.float_info.epsilon.

sys.float_info.epsilon is defined as the difference between 1.0 and
the next largest representable floating-point number.  On your system,
the next largest float is almost certainly 1 + 2**-52, so
sys.float_info.epsilon will be exactly 2**-52, which is around
2.2e-16.  This number is a good guide to the relative error
from rounding that you can expect from a basic floating-point
operation.

The smallest positive floating-point number is *much* smaller:
again, unless you have a very unusual platform, it's going to
be 2**-1074, or around 4.9e-324.  In between 2**-1074 and
2**-52 there are approximately 4.4 million million million
different floating-point numbers.  Take your pick!

If you want a specific example, how about float('6.626e-34').

Mark


From stefan_ml at behnel.de  Wed Feb  4 15:02:52 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 04 Feb 2009 21:02:52 +0100
Subject: Using lxml to screen scrap a site, problem with charset
In-Reply-To: <gm7bfl$vf8$1@foggy.unx.sas.com>
References: <ciqh56-ses.ln1@archaeopteryx.softver.org.mk>
	<gm7bfl$vf8$1@foggy.unx.sas.com>
Message-ID: <4989f46c$0$31338$9b4e6d93@newsspool4.arcor-online.net>

Tim Arnold wrote:
> "?????? ???????????" <gdamjan at gmail.com> wrote in message 
> news:ciqh56-ses.ln1 at archaeopteryx.softver.org.mk...
>> So, I'm using lxml to screen scrap a site that uses the cyrillic
>> alphabet (windows-1251 encoding). The sites HTML doesn't have the <META
>> ..content-type.. charset=..> header, but does have a HTTP header that
>> specifies the charset... so they are standards compliant enough.
>>
>> Now when I run this code:
>>
>> from lxml import html
>> doc = html.parse('http://a1.com.mk/')
>> root = doc.getroot()
>> title = root.cssselect(('head title'))[0]
>> print title.text
>>
>> the title.text is ? unicode string, but it has been wrongly decoded as
>> latin1 -> unicode
> 
> The way I do that is to open the file with codecs, encoding=cp1251, read it 
> into variable and feed that to the parser.

Yes, if you know the encoding through an external source (especially when
parsing broken HTML), it's best to pass in either a decoded string or a
decoding file-like object, as in

	tree = lxml.html.parse( codecs.open(..., encoding='...') )

You can also create a parser with an encoding override:

	parser = etree.HTMLParser(encoding='...', **other_options)

Stefan


From dickinsm at gmail.com  Wed Feb  4 15:07:23 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 4 Feb 2009 12:07:23 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org> 
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
Message-ID: <8f6095b4-f316-4c64-a210-ab0d746659d7@s1g2000prg.googlegroups.com>

On Feb 4, 7:52?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> You are missing the whole thing that mes floating point tricky.
> I _believe_ that the epsilon is the smallest positive x such that
> ? ? 1.0 != 1.0 + x

Nitpick alert:  this isn't quite the same thing, since that
definition is affected by rounding.  For example, if you're
using IEEE 754 doubles but (somehow) you've got a round-half-up
rounding mode then this makes epsilon 2**-53 rather than 2**-52,
because 1 + 2**-53 rounds to 1 + 2**-52 != 1.

(This confused the hell out of me many years ago when I was
reading Numerical Recipes, and trying to figure out why
on earth IEEE 754 and the VAX format had different epsilons
even though both had 53-bit mantissas.  The answer is that
IEEE 754 uses round-half-even as standard, and VAX uses
round-half-up.  Oh, and the authors of Numerical Recipes
used the 1 != 1+x definition...)

Python's float_info.epsilon comes straight from C's
DBL_EPSILON, which is defined very carefully in the C99 standard
as:

"""the difference between 1 and the least value greater than 1
that is representable in the given floating point type"""

(taking the 'given floating point type' to be double).

Mark



From mdw at distorted.org.uk  Wed Feb  4 15:16:03 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:16:03 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<mailman.8742.1233708722.3487.python-list@python.org>
	<4ec8770b-631f-492b-be7a-27bb8ac47afc@i20g2000prf.googlegroups.com>
	<mailman.8751.1233719408.3487.python-list@python.org>
	<11ee7ba4-12f2-4744-80af-315dbea78cd9@r41g2000prr.googlegroups.com>
Message-ID: <87d4dylzzw.fsf.mdw@metalzone.distorted.org.uk>

"Russ P." <Russ.Paielli at gmail.com> writes:

> Imagine you own a company, and you decide to lease an office building.
> Would you expect the office doors to have locks on them? Oh, you
> would? Why? You mean you don't "trust" your co-workers? What are locks
> but enforced access restriction?

Huh?  The lock on the door isn't to keep the coworkers out.  It's to let
them /in/ while keeping everyone else out.  So I don't really see the
analogy.

Or are you talking about the individual offices?  If so, then I'd expect
the locks to be /used/ only under rather unusual circumstances.  If
someone in the office has something to hide, I think that's rather
suspicious, actually...

-- [mdw]


From pellegrinodj at gmail.com  Wed Feb  4 15:18:28 2009
From: pellegrinodj at gmail.com (pellegrinodj at gmail.com)
Date: Wed, 4 Feb 2009 12:18:28 -0800 (PST)
Subject: how to compile in jython 2.5b1??
Message-ID: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>

I have to use jython 2.5b1 couse with the stable version it's not
possible to use sympy library for mathematic operation but the
"jythonc.bat" it's not included.
I look to this link: http://www.jython.org/Project/jythonc.html
"..jythonc is unmaintained and will not be present in its current form
in Jython 2.5..."
so what can I do??
thank you for the answer!!


From steve at holdenweb.com  Wed Feb  4 15:20:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 15:20:29 -0500
Subject: sys.float_info.epsilon
In-Reply-To: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>
References: <aee48b3c0902041118q5c8c49e3tbbf175d2921b69bc@mail.gmail.com>
Message-ID: <gmctai$2ho$1@ger.gmane.org>

Tim Rowe wrote:
> I'm reading Mark Summerfield's "Programming Python 3.0" at the moment,
> and I'm puzzled by some of his uses of sys.float_info.epsilon. I
> appreciate the issues of comparing floating point numbers, but I'm
> puzzled by code like:
>     ...
>     x = float(input(msg))
>     if abs(x) < sys.float_info.epsilon:
>         ...
> 
> What could the float() conversion return that would give different results for:
>     if abs(x) < sys.float_info.epsilon
> and (to my mind, more obvious):
>     if abs(x) == 0.0
> 
> I didn't realise that float() could return anything with an absolute
> value less than sys.float_value.epsilon other than 0.0 (which I think
> all representations can represent exactly).  What am I missing here?
> 
epsilon is the difference between *1.0* and the next smallest number in
the representation.

It seems pretty obvious that the smallest representable number will be
way smaller than that. To me, at least. Think about the representation
of 1. + epsilon - the mantissa will have a leading 1, then all zeros but
for a trailing 1, and the exponent will effectively be 0.

For numbers close to zero the exponent will have a large negative
effective value (exponents are usually stored as biased positive
numbers), and so the smallest value will be tiny compared with epsilon.

Though it's a long time since I did my numerical analysis, and it isn't
clear to me exactly what the test *is* supposed to do.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From nytrokiss at gmail.com  Wed Feb  4 15:23:25 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Wed, 4 Feb 2009 22:23:25 +0200
Subject: [Web 2.0] Added-value of frameworks?
In-Reply-To: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <8a6b8e350902041223u68f4655bu728d49d25195672e@mail.gmail.com>

They provide a nice framework that will handle most of the annoying things.
With Django you don't need to write SQL (in a sense). etc..

On Wed, Feb 4, 2009 at 6:08 PM, Gilles Ganault <nospam at nospam.com> wrote:

> Hello
>
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?
>
> Thank you for your feedback.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From joviyach at gmail.com  Wed Feb  4 15:31:37 2009
From: joviyach at gmail.com (joviyach)
Date: Wed, 4 Feb 2009 12:31:37 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
Message-ID: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>

I am fairly new to Python, the first version I loaded was 2.6. I have
since downloaded 3.0 and I was wondering what the best practice for
upgrading is? I am using Windows XP Pro for my OS.

Thanks,

Jim


From Scott.Daniels at Acm.Org  Wed Feb  4 15:43:02 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 12:43:02 -0800
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
Message-ID: <S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>

joviyach wrote:
> I am fairly new to Python, the first version I loaded was 2.6. I have
> since downloaded 3.0 and I was wondering what the best practice for
> upgrading is? I am using Windows XP Pro for my OS.

On Windows, X.Y.* all go in one directory (over-riding each other)
So the whole 2.6.* family should work just fine alongside the 3.0.*
family.  In just a bit, 3.0.1 is coming soon, correcting some problems
in 3.0, so if you do install 3.0, check in a few weeks for an update.
The 2 -> 3 change was pretty substantial, so it will be a bit until the
3.0 line gets lots of outside packages.

--Scott David Daniels
Scott.Daniels at Acm.Org


From mdw at distorted.org.uk  Wed Feb  4 15:44:49 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:44:49 +0000
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8395.1233347525.3487.python-list@python.org>
	<0ea1a7b8-7fa5-4d32-80c2-2614b82dde5e@f3g2000yqf.googlegroups.com>
	<mailman.8483.1233433642.3487.python-list@python.org>
	<b1770469-460d-4bbb-8ffc-3ee2c53709d9@r34g2000vbp.googlegroups.com>
	<6ul2ieFg1sraU1@mid.uni-berlin.de>
	<73df3c0e-425b-4d0d-a7ba-8c15970678ef@p37g2000yqd.googlegroups.com>
	<gm4rl1$21r$1@ger.gmane.org>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<pan.2009.02.03.08.45.22@REMOVE.THIS.cybersource.com.au>
	<498825f3$0$3303$426a74cc@news.free.fr>
	<pan.2009.02.04.07.10.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <878womlyny.fsf.mdw@metalzone.distorted.org.uk>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

> Now, that's a toy example. Languages like Ada make correctness proofs, 
> well, perhaps not easy, but merely difficult compared to impossible for 
> languages like Python.

Say `generally impractical' rather than `impossible' and I'll agree with
you.  But I'm not actually sure that the situation for Python with
respect to correctness proofs is significantly harder than it is for C.
Certainly Ada (or at least dialects of Ada) have features which make
proof-supporting tools easier; I'm not aware of such proof support for
other languages.

Actually, if you're starting from a formal specification in Z, say, and
implementing in Python, well, the Z checker will already have ensured
that your specification is well typed; your proof that the
implementation follows the specification will automatically contain a
well-typed-ness proof of your implementation regardless of whether the
compiler provides static verification.

> To bring it back to private/public attributes, side-effects make 
> correctness proofs difficult. Modifications of attributes are side-
> effects. When attributes are subject to being modified by arbitrary code, 
> it is harder to reason about the correctness of the code:
>
> class Inverter(object):
>     def __init__(self, x):
>         # Pre-condition: x is always a float
>         if x:
>             self.x = x
>         else:
>             raise ValueError("x must not be zero")
>         # Post-condition: if self.x exists, it is a non-zero float
>     def invert(self):
>         return 1.0/self.x
>
>
> Is method invert correct?

I'd argue that it isn't, and in fact that the specification is wrong.
In particular, it ought to be a precondition that x is nonzero.  At this
point you can dump the explicit check at the cost of imposing a proof
obligation on the caller.

> No, it is not, because the invariant that self.x is non-zero may have 
> been broken by some arbitrary piece of code elsewhere. 

It's not stated as an invariant.  It's stated as a post-condition, which
is indeed true (almost[1]) regardless of the behaviour of other parts of
the program.

[1] A subclass may have already set self.x before invoking
    Inverter.__init__.  If you explicitly `del self.x' before raising
    the exception, the subclass can still defeat you by passing the
    reference to the half-constructed object to another thread which
    mutates the object at an inconvenient time.  I mention all of this
    merely to avoid pedantry in follow-ups.

I'd also argue that maintaining the invariant about self.x is the
responsibility of code that messes with self.x, and therefore it is
/legitimate/ to modify self.x from external code which maintains the
invariant.

> Our ability to reason about the correctness of the code is weakened
> significantly.  Sticking an underscore in front of x does not help:
> there's nothing to stop some arbitrary function elsewhere changing _x
> to zero.

Dichotomy for you.

  * EITHER the other code is written to the same high standards, in
    which case it will come with appropriate specifications,
    preconditions, postconditions, invariants and proofs for whatever it
    does, even -- especially -- if it involves grubbily messing about
    with your module's innards (so everything is fine);

  * OR the other code doesn't meet your high standards, in which case
    all bets are off anyway, from the point of view of formal-methods
    types at any rate (so you can wash your hands of the whole affair).

> (1) Paranoia. Make the developer responsible for checking everything all 
> the time:
[...]
> (2) Hope the error never occurs, and if it does, let the caller deal with 
> it.
[...]
> There is a third strategy, sadly not available to Python programmers: 
> prevention by catching potential errors at compile-time.

Four: Describe your interface clearly, specify the behaviour of
functions and so on; and leave whoever messes with your module with the
task of proving -- to whatever level of formality is required by their
project -- that what they've done is sane and reasonable.

In fact, since whatever one does in a project should be held to this
standard, whether it involves grubbing about inside undocumented
internals or not, there's nothing particularly special about this case.
Good job, really, since Python doesn't distinguish either. ;-)

-- [mdw]


From mdw at distorted.org.uk  Wed Feb  4 15:49:23 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Wed, 04 Feb 2009 20:49:23 +0000
Subject: Where & how to deallocate resources in Python C extension
References: <8fe56d94-1d33-44d9-980f-a92c077a30d1@k36g2000pri.googlegroups.com>
Message-ID: <874ozalygc.fsf.mdw@metalzone.distorted.org.uk>

fredbasset1000 at gmail.com writes:

> I've written a C extension, see code below, to provide a Python
> interface to a hardware watchdog timer.  As part of the initialization
> it makes some calls to mmap, I am wondering should I be making
> balanced calls to munmap in some kind of de-init function?

The kernel should remove the mapping when your process exits anyway --
otherwise the world would be left in an inconsistent state if your
process got killed by SIGKILL for example.

> Do Python extensions have d'tors?

No.  But you can cheat: stash some object whose tp_del slot does your
cleanup in your extension's module under some funny name.  (And woe
betide anyone who dels the funny name prematurely!)  I'm not sure I'd
bother.

-- [mdw]


From deets at nospam.web.de  Wed Feb  4 15:56:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 04 Feb 2009 21:56:59 +0100
Subject: how to compile in jython 2.5b1??
In-Reply-To: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
Message-ID: <6uudorFh6dr4U1@mid.uni-berlin.de>

pellegrinodj at gmail.com schrieb:
> I have to use jython 2.5b1 couse with the stable version it's not
> possible to use sympy library for mathematic operation but the
> "jythonc.bat" it's not included.
> I look to this link: http://www.jython.org/Project/jythonc.html
> "..jythonc is unmaintained and will not be present in its current form
> in Jython 2.5..."
> so what can I do??
> thank you for the answer!!


What do you need jythonc for? That's purely for a somewhat neater 
integration of *Java* with jython - nothing to do with sympy.

Diez


From kst-u at mib.org  Wed Feb  4 16:06:30 2009
From: kst-u at mib.org (Keith Thompson)
Date: Wed, 4 Feb 2009 21:06:30 +0000 (UTC)
Subject: structs
References: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<lnocxj7y2t.fsf@nuthaus.mib.org>
Message-ID: <ln6jx91syq.fsf@nuthaus.mib.org>

"Scott David Daniels" <Scott.Daniels at Acm.Org> writes:
> To avoid using epsilon, do something like: 
>     if 1 + abs(x) != 1:


An OK effort, but you're wrong.  That's not how to do it at all.


From pellegrinodj at gmail.com  Wed Feb  4 16:08:05 2009
From: pellegrinodj at gmail.com (ruelle)
Date: Wed, 4 Feb 2009 13:08:05 -0800 (PST)
Subject: how to compile in jython 2.5b1??
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
	<6uudorFh6dr4U1@mid.uni-berlin.de>
Message-ID: <1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>

> What do you need jythonc for? That's purely for a somewhat neater
> integration of *Java* with jython - nothing to do with sympy.
>
> Diez

I need jythonc to compile a simple script in java,
this script import SymPy library.

thank you
ruelle


From mal at egenix.com  Wed Feb  4 16:16:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:16:31 +0100
Subject: JDBC in CPYTHON
In-Reply-To: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
Message-ID: <498A05AF.2070706@egenix.com>

On 2009-02-03 19:30, KMCB wrote:
> I was wondering if anyone was aware of a JDBC DBAPI module for
> cpython.  I have looked at PYJDBC and was interested in avoiding using
> that extra level of ICE.  I was thinking maybe someone would have back
> ported zxJDBC from Jython.  Or used that as a starting point, to
> create a module and had a C based wrapper for the driver.  This type
> of activity was talked about back in 2004 on this forum, but I was
> wondering if anyone had newer information.

Why not use ODBC instead ?

   http://www.egenix.com/products/python/mxODBC/

(zxJDBC is based on and was inspired by mxODBC)

Or, if you don't have ODBC drivers for your database, use an
ODBC-JDBC bridge such as:

    http://www.easysoft.com/products/data_access/odbc_jdbc_gateway/
or
    http://odbcjdbc.sourceforge.net/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From kst-u at mib.org  Wed Feb  4 16:20:43 2009
From: kst-u at mib.org (Keith Thompson)
Date: Wed, 4 Feb 2009 21:20:43 +0000 (UTC)
Subject: structs
References: <mailman.8268.1233224504.3487.python-list@python.org>
	<lnwsc66tg7.fsf@nuthaus.mib.org>
Message-ID: <ln6jx71iyq.fsf@nuthaus.mib.org>

"Gary Herron" <gherron at islandtraining.com> writes:
> Python *is* object-oriented

I disagree. Care to provide proof of that statement?


From mal at egenix.com  Wed Feb  4 16:26:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:26:37 +0100
Subject: x64 speed
In-Reply-To: <49896AA0.2050202@chamonix.reportlab.co.uk>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>	<4988BAE8.2060204@v.loewis.de>
	<49896AA0.2050202@chamonix.reportlab.co.uk>
Message-ID: <498A080D.3000703@egenix.com>

On 2009-02-04 11:14, Robin Becker wrote:
> Martin v. L?wis wrote:
>>>> I follow David's guess that Linux does better IO than Windows (not
>>>> knowing anything about the benchmark, of course)
>>>>
>>> I originally thought it must be the vmware host stuff offloading IO to
>>> the second core, but watching with sysinternals didn't show a lot of
>>> extra stuff going on with the vm compared to just running on the host.
>>
>> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
>> Linux buffer handling, is just more efficient than NTFS, and the Windows
>> buffer handling.
>>
>> If you split the total runtime into system time and user time, how do
>> the 30s split up?
> .......
> so here is one for the vm clock is bad theorists :)
> 
> 
>> [rptlab at localhost tests]$ time python25 runAll.py
>> .............................................................
> 
> .........................
>> ----------------------------------------------------------------------
>> Ran 193 tests in 27.841s
>>
>> OK
>>
>> real    0m28.150s
>> user    0m26.606s
>> sys     0m0.917s
>> [rptlab at localhost tests]$
> 
> magical how the total python time is less than the real time.

time(1) also measures the Python startup and shutdown time, so
I don't quite see the magic :-(

FWIW: VMware VMs need the VMware tools installed to make their
clocks work more or less. With Linux, you need some extra tweaks
as well, otherwise the clocks are just completely unreliable.

See these notes:

http://kb.vmware.com/selfservice/viewContent.do?language=en_US&externalId=1420
http://communities.vmware.com/message/782173

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From bignose+hates-spam at benfinney.id.au  Wed Feb  4 16:28:43 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Thu, 05 Feb 2009 08:28:43 +1100
Subject: Kill a function while it's being executed
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com>
	<6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com>
	<1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com>
	<49897C95.1000301@wildenhain.de>
	<749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
	<mailman.8777.1233762857.3487.python-list@python.org>
Message-ID: <878wolzyb8.fsf@benfinney.id.au>

"Noam Aigerman" <noama at answers.com> writes:

> About the hijacking - I *might* have done it without understanding
> what I did (replied to a previous message and then changed the
> subject), if that's what you mean...

Right. The message still declares itself (via fields in the header) to
be a reply to the original, regardless of the subject change. If your
reply actually has no bearing on the original, then that's what is
known as hijacking a thread.

To start a new thread, you need to compose a new message to the forum.

-- 
 \       ?[Freedom of speech] isn't something somebody else gives you. |
  `\      That's something you give to yourself.? ?_Hocus Pocus_, Kurt |
_o__)                                                         Vonnegut |
Ben Finney


From mal at egenix.com  Wed Feb  4 16:43:04 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 04 Feb 2009 22:43:04 +0100
Subject: Unzipping a .zip properly, and from a remote URL
In-Reply-To: <4988557A.5020407@wildenhain.de>
References: <874ozbhdoi.fsf@christopherculver.com>	<mailman.8689.1233667986.3487.python-list@python.org>	<87y6wnfxoe.fsf@christopherculver.com>
	<4988557A.5020407@wildenhain.de>
Message-ID: <498A0BE8.5080205@egenix.com>

On 2009-02-03 15:32, Tino Wildenhain wrote:
> Christopher Culver wrote:
>> Tino Wildenhain <tino at wildenhain.de> writes:
>>> so instead you would use archive = zipfile.ZipFile(remotedata)
>>
>> That produces the following error if I try that in the Python
>> interpreter (URL edited for privacy):
>>
>>>>> import zipfile
>>>>> import urllib2
>>>>> remotedata = urllib2.urlopen("http://...file.zip")
>>>>> archive = zipfile.ZipFile(remotedata)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "/usr/lib/python2.5/zipfile.py", line 346, in __init__
>>     self._GetContents()
>>   File "/usr/lib/python2.5/zipfile.py", line 366, in _GetContents
>>     self._RealGetContents()
>>   File "/usr/lib/python2.5/zipfile.py", line 376, in _RealGetContents
>>     endrec = _EndRecData(fp)
>>   File "/usr/lib/python2.5/zipfile.py", line 133, in _EndRecData
>>     fpin.seek(-22, 2)               # Assume no archive comment.
>> AttributeError: addinfourl instance has no attribute 'seek'

Try this:

>>> import urllib, zipfile, cStringIO
>>> zipwebfile = urllib.urlopen('http://downloads.egenix.com/python/locale-0.1.zip')
>>> buffer = cStringIO.StringIO(zipwebfile.read())
>>> zfile = zipfile.ZipFile(buffer)
>>> zfile.printdir()
File Name                                             Modified             Size
locale/Makefile.pre.in                         1997-10-31 21:13:06         9818
locale/Setup.in                                1997-10-31 21:14:04           74
locale/locale.c                                1997-11-19 17:36:46         4698
locale/CommandLine.py                          1997-11-19 15:50:02         2306
locale/probe.py                                1997-11-19 15:51:18         1870
locale/__init__.py                             1997-11-19 17:55:02            0

The trick is to use a StringIO buffer to provide the .seek()
method.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 04 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From digitig at gmail.com  Wed Feb  4 16:44:49 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 21:44:49 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902041344h70a1fa27lde3e0951c711fa44@mail.gmail.com>

2009/2/4 Mark Dickinson <dickinsm at gmail.com>:

> There are many positive floating-point values smaller than
> sys.float_info.epsilon.
>
> sys.float_info.epsilon is defined as the difference between 1.0 and
> the next largest representable floating-point number.  On your system,
> the next largest float is almost certainly 1 + 2**-52, so
> sys.float_info.epsilon will be exactly 2**-52, which is around
> 2.2e-16.  This number is a good guide to the relative error
> from rounding that you can expect from a basic floating-point
> operation.
>
> The smallest positive floating-point number is *much* smaller:
> again, unless you have a very unusual platform, it's going to
> be 2**-1074, or around 4.9e-324.  In between 2**-1074 and
> 2**-52 there are approximately 4.4 million million million
> different floating-point numbers.  Take your pick!

Ok, that makes a lot of sense, thanks. I was thinking in terms of
Ada's floating point delta (rather than epsilon), which as I remember
it, if specified, applies uniformly across the whole floating point
range, not just to a particular point on the scale.

That just leaves me puzzled as to why Mark Summerfield used it instead
of a check against zero on user input. There's a later division by
2*x, so small values of x matter; there's no protection against
overflow (the numerator could perfectly well be somewhere up near
sys.float_info.max; a quick check in the shell tells me that Python3
will happily do sys.float_info.max/(2*sys.float_info.epsilon) and will
give me the answer "inf") so presumably he's trying to protect against
divide by zero. So my next question is whether there is any x that can
be returned by float() such that x != 0 but some_number / (2 * x)
raises a ZeroDivisionError?


-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 16:47:24 2009
From: digitig at gmail.com (Tim Rowe)
Date: Wed, 4 Feb 2009 21:47:24 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
Message-ID: <aee48b3c0902041347w79e610ey364ef3f6e5319b44@mail.gmail.com>

2009/2/4 Scott David Daniels <Scott.Daniels at acm.org>:

Thanks for that. It makes me feel guilty to point out that:

> addition is not associative in real numbers

should presumably be "addition is not associative in floating point numbers".

-- 
Tim Rowe


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb  4 16:49:53 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 22:49:53 +0100
Subject: Couple of noobish question
In-Reply-To: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
Message-ID: <498a1b1d$0$24204$426a74cc@news.free.fr>

Catherine Heathcote a ?crit :
> Firstly hi, I don't know any of you yet but am picking up Python and 
> will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 
> years of a comp tech degree, long story) and am learning Python, 'cos I 
> saw some code and it just looks a really nice language to work with. I 
> come from C++, so I am bound to trip up trying to do things the wrong way!
> 
> I have been working with Project Euler to get the hang of Python, and 
> all goes well. I have an idea for a small project, an overly simplistic 
> interactive fiction engine (well more like those old choose your own 
> adventure books, used to love those!) that uses XML for its map files.

You may have good reasons to choose this format, but FWIW, some (most ?) 
of us here tend to prefer "lighter" formats like json or yaml, or even 
just plain Python source. But, well, just so you know there are possible 
alternatives to XML !-)

> The main issues I see so far is the XML parsing (I should pick that up 
> ok, I have a blackbelt in google-foo), but more importantly splitting 
> code files.

???

Oh, you mean, how to organize your source code ?

> In C++ I would obviously split .cpp and .h files, pairing them up and 
> using #include. How do I do this in Python? I see that you don't tend to 
> split logic from defenition,

Ok.

First thing you must know: in Python, almost everything happens at 
runtime (the only error you might get at compile time is SyntaxError), 
and "import", "class" and "def" are actually executable statements. That 
is, when a module (or main program FWIW) is first loaded (directly for 
the main program, via an import statement for other modules), all the 
top-level code of the corresponding source file is executed 
sequentially. One of the implications is that there's no need for 
preprocessor directives - you just use Python code (at the module 
top-level) to have alternative versions of a function or conditional 
imports (which BTW are _not_ the same as #include directives ). Like:


# somemodule.py

import os

if os.uname()[0] == "Linux":
    def somefunc():
        return "this is the Linux version"
else
    def somefunc():
        return "this is not the Linux version"

try:
   import some_module
   something = some_module.something
else:
    # some_module not installed
   something = "default"

# etc...


To make a long story short: your notions of "definition" and "logic" 
don't really apply here.

>  but how do I keep different classes in 
> different files? 

You don't necessarily have to keep you class in "different files" - it 
really depends on the project's complexity. If you only have a couple 
classes, functions and (pseudo)constants, you just stick them either in 
the main program file (if it's a simple script) or in a module. If it 
gets a bit more complex, regroup classes and functions in distinct 
modules or packages trying to make each module (or package) as cohesive 
and decoupled as possible. Just have at look at the modules and packages 
in the stdlib to see what it may looks like.

> My google-fu fails me so far.

You were probably lokking for this:
http://docs.python.org/tutorial/modules.html

My two cents...


From deets at nospam.web.de  Wed Feb  4 16:55:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 04 Feb 2009 22:55:48 +0100
Subject: how to compile in jython 2.5b1??
In-Reply-To: <1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>
References: <6784ac72-0dbb-4904-b92b-3bee3418a233@r37g2000prr.googlegroups.com>
	<6uudorFh6dr4U1@mid.uni-berlin.de>
	<1d4d9261-6d0d-4312-8967-0fa13dc98e09@r10g2000prf.googlegroups.com>
Message-ID: <6uuh74Fh26j9U1@mid.uni-berlin.de>

ruelle schrieb:
>> What do you need jythonc for? That's purely for a somewhat neater
>> integration of *Java* with jython - nothing to do with sympy.
>>
>> Diez
> 
> I need jythonc to compile a simple script in java,
> this script import SymPy library.

You need to find other ways.

The usual approach to this is a factory-pattern with an embedded 
Jython-interpreter. There is the Jython-magazine that a couple of years 
ago brought a few examples of these techniques. They roughly work as this:


  - create a jython-file contains a jython-class 
subclassing/implementing some Java class or interface.

  - write a java-class that instantiates a jython interpreter

  - make that intepreter execute a small script (one-liner) to create 
one  instance of that jython-class, and assigns it to a global variable.

  - fetch that variable's value from the interpreter-instance, and pass 
it to some java-code that works with it.

This is working for nearly *all* use-cases, the exception only being 
rare casese where some Java-framework itself uses something like 
classForName to instantiate a class (e.g. struts for action-classes)

But even then, you could simply create a java delegation class with the 
same recipe.

There really is no need for the Jythonc, which is the reason it is 
discontinued I presume.

Diez


From aahz at pythoncraft.com  Wed Feb  4 17:01:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 Feb 2009 14:01:02 -0800
Subject: Understanding descriptors
References: <mailman.8322.1233272628.3487.python-list@python.org>
Message-ID: <gmd36u$eq2$1@panix3.panix.com>

In article <mailman.8322.1233272628.3487.python-list at python.org>,
Brian Allen Vanderburg II  <BrianVanderburg2 at aim.com> wrote:
>
>  [...]
>
>When a lookup is done it uses this descriptor to make a bound or unbound 
>method:
>
>c=C()
>
>C.F # unbound method object, expects explicit instance when calling the 
>function
>c.F # bound method object provides instance implicitly when calling the 
>function
>
>This is also done when adding to the classes:
>
>C.f1 = f1
>
>f1 # function
>C.f1 # unbound method
>c.f1 # bound method
>
>To prevent this it has to be decorated so the descriptor doesn't cause 
>the binding:
>
>C.f2 = staticmethod(f1)
>C.f2 # functon
>c.f2 # function
>
>Here is a question, why don't instance attributes do the same thing?
>
>c.f3 = f1
>c.f3 # function, not bound method
>
>So it is not calling the __get__ method for c.f3  After it finds c.f3 in 
>c.__dict__, and since it has a getter, shouldn't it call the __get__ to 
>return the bound method.  It is good that it doesn't I know, but I just 
>want to know why it doesn't from an implementation view.

This is a bit beyond my expertise, but nobody else has responded, so I'll
take a stab at it:

Basically, this is part of the design philosphy that keeps everything
working the same way.  When an attribute is found on an instance, it
gets returned unmodified.  Period.  In other words, the fact that f3
happens to return a function object gets ignored.  You can force f3 to
work like a bound method by defining it as one:

def f3(self):
    pass

If you use a new-style class or Python 3.0, the same design is evident
when you try to use e.g. str() to call the __str__() special method: the
instance gets ignored for looking up the method.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb  4 17:01:14 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 04 Feb 2009 23:01:14 +0100
Subject: [Web 2.0] Added-value of frameworks?
In-Reply-To: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
Message-ID: <498a1dc7$0$10675$426a74cc@news.free.fr>

Gilles Ganault a ?crit :
> Hello
> 
> If I wanted to build some social web site such as Facebook, what do
> frameworks like Django or TurboGears provide over writing a site from
> scratch using Python?

Quite a lot of abstractions and factorisation of the boilerplate code, a 
known way to organize your application, and possibly a good integration 
of the usual components (and wrt/ Django, a customizable yet fairly 
usable OOTB admin interface). For simple to mediumly complex 
applications, this can mean more than 80% of the grunt work. The 
counterpart is mostly learning and understanding the framework, which 
means you may not save that much time on a first project - but it can 
really pay off then. One of my coworker started this morning a (really 
simple...) project which acceptance tests are to begin on monday, and we 
are all quite confident he'll deliver on time, thanks to Django.



From kyrie at uh.cu  Wed Feb  4 17:13:31 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Wed, 4 Feb 2009 17:13:31 -0500
Subject: is python Object oriented??
In-Reply-To: <fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<mailman.8774.1233754556.3487.python-list@python.org>
	<fb73acb2-3df0-460b-9d58-bb50985b6086@e1g2000pra.googlegroups.com>
Message-ID: <200902041713.32118.kyrie@uh.cu>

On Wednesday 04 February 2009 10:53:54 am Russ P. wrote:
> On Feb 4, 5:35?am, Luis Zarrabeitia <ky... at uh.cu> wrote:
> > Quoting "Russ P." <Russ.Paie... at gmail.com>:
> > This analogy is nonsense. There is no way you will execute code on my
> > system if I don't authorize it, regardless of how "public" are the
> > variables declared in my code. No one will execute code on _your_ system
> > either, without your authorization. That puts you in a different
> > position: you can easily _check_ that everything is alright before
> > executing, whereas in the office example, it cannot be done.
>
> I don't follow your point, 
[...]
> The locks on the doors are analogous to enforced access restrictions.

And that is my point, nothing more, nothing less. They aren't analogous.

I know a bit of python, and a bit of programming, and I think you do too. If 
you can't make your point without an analogy, isn't it perhaps that your 
point is not transferable from the analogy to the python context where you 
are trying to apply it?.

You can control everything that happens in your systems, whatever those 
systems may be. There are no locks, no offices, no employees going unchecked. 
You can decide, at any time you want, if the code you are about to run meets 
your policies. The particular one you are talking about, the "data hiding", 
can be easily checked. By you, by the QA team, by a computer, by an automated 
system, by your own pseudo python interpreter that will run pylint against 
the code before trying to run it. 

Insert that into your office analogy, and maybe then situations will be a 
little more analogous. But keep in mind that the only difference between what 
you claim to want and what you currently have, is that _you_ (not me) can 
decide whether to use it or not.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From joviyach at gmail.com  Wed Feb  4 17:38:06 2009
From: joviyach at gmail.com (joviyach)
Date: Wed, 4 Feb 2009 14:38:06 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
Message-ID: <4bb62c09-d590-4065-90eb-f112aedd97df@d36g2000prf.googlegroups.com>

On Feb 4, 2:43?pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> joviyach wrote:
> > I am fairly new to Python, the first version I loaded was 2.6. I have
> > since downloaded 3.0 and I was wondering what the best practice for
> > upgrading is? I am using Windows XP Pro for my OS.
>
> On Windows, X.Y.* all go in one directory (over-riding each other)
> So the whole 2.6.* family should work just fine alongside the 3.0.*
> family. ?In just a bit, 3.0.1 is coming soon, correcting some problems
> in 3.0, so if you do install 3.0, check in a few weeks for an update.
> The 2 -> 3 change was pretty substantial, so it will be a bit until the
> 3.0 line gets lots of outside packages.
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Thanks Scott, I will be lurking/hopefully contributing.


From steve at holdenweb.com  Wed Feb  4 17:38:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 17:38:23 -0500
Subject: structs
In-Reply-To: <ln6jx71iyq.fsf@nuthaus.mib.org>
References: <mailman.8268.1233224504.3487.python-list@python.org>	<lnwsc66tg7.fsf@nuthaus.mib.org>
	<ln6jx71iyq.fsf@nuthaus.mib.org>
Message-ID: <gmd5d0$v80$1@ger.gmane.org>

Keith Thompson wrote:
> "Gary Herron" <gherron at islandtraining.com> writes:
>> Python *is* object-oriented
> 
> I disagree. Care to provide proof of that statement?

Disagree all you like. Just do it silently, please.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Wed Feb  4 17:49:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 14:49:51 -0800 (PST)
Subject: Structuring Modules with a Ubiquitous Base Class (Circular 
	Dependencies)
Message-ID: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>

Is there a good solution to the following problem?

I have a library whose components I would like to separate into
distinct modules.  These components inherit from a common base class
that provides common functionality (the inheritance is important only
for implementation; there's a separate ABC mechanism for typing).

Now as that stands, there is no problem.  Each module could import the
common base class.

Unfortunately the base class itself references many of the components
(the reason for this is that supplies operator implementations (like
__add__) which are shortcuts for the components themselves).

This leads to a circular dependency - the base class wants to import
the components, which in turn want to import the base class.

Is there any standard solution to this?

Thanks,
Andrew


From lionel.keene at gmail.com  Wed Feb  4 17:51:17 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 14:51:17 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
Message-ID: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>

Hello everyone. Quick question: When using the "read()" method in the
array module, must I redirect the current file pointer or will that
occur automatically?

For example, if I were to sequentially read data in chunks from a
binary file as in:


for currentChunk in range(numberOfChunksToRead):

       floatData = array.array('f')
       floatData.read(MyFileHandle, numberOfFloatsPerChunk)
       ...go to work on data...


at each iteration of the "for" loop, will the next chunk of bytes be
read into "floatData" or must I move the file pointer by calling "seek
()" or some function like that?

Thanks everyone.
L


From Scott.Daniels at Acm.Org  Wed Feb  4 17:53:07 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 14:53:07 -0800
Subject: More on ancient pythons (before version 0.0?)
Message-ID: <86udncDdhtd8hhfUnZ2dnUVZ_rHinZ2d@pdx.net>

Apparently there is some fossil evidence of an early version of Python
over 50 million years ago.  Must have been some large negative
version.  It apparently suffered from serious code bloat, since
the article says it was 13 meters long and over a megagram.
     http://news.bbc.co.uk/1/hi/sci/tech/7868588.stm
I know, Titanoboa might not have actually been a python, but it
may well have been a precursor to our Python.

--Scott David Daniels
Scott.Daniels at Acm.Org


From lsumnler at gmail.com  Wed Feb  4 18:06:00 2009
From: lsumnler at gmail.com (len)
Date: Wed, 4 Feb 2009 15:06:00 -0800 (PST)
Subject: How to find wxPython method documentation??
Message-ID: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>

Hi

I am going through the "wxPython in Action" book by Noel Rappin and
Robin Dunn.

I have been typing in the example programs as I go and play with
modifing the code.
Thought I should start trying to find my way around the documentation
found on the wxPython web site.

The problem I have been having is I can't find the methods or more
specifically

'SetBackgroundColour' or 'AddSimpleTool' for example.

How does one find the methods that are available in the classes.

I tried looking at the wxWidgets web site and still had the same
problem.

Could someone give me a little direction in this?

Thanks
Len


From google at mrabarnett.plus.com  Wed Feb  4 18:10:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 04 Feb 2009 23:10:39 +0000
Subject: Does array.read() move file pointer automatically?
In-Reply-To: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
Message-ID: <498A206F.7090501@mrabarnett.plus.com>

Lionel wrote:
 > Hello everyone. Quick question: When using the "read()" method in the
 > array module, must I redirect the current file pointer or will that
 > occur automatically?
 >
 > For example, if I were to sequentially read data in chunks from a
 > binary file as in:
 >
 >
 > for currentChunk in range(numberOfChunksToRead):
 >
 >        floatData = array.array('f')
 >        floatData.read(MyFileHandle, numberOfFloatsPerChunk)
 >        ...go to work on data...
 >
 >
 > at each iteration of the "for" loop, will the next chunk of bytes be
 > read into "floatData" or must I move the file pointer by calling "seek
 > ()" or some function like that?
 >
The read() method has been deprecated since version Python 1.5.1. Use
the fromfile() method instead.

It will advance the file pointer.


From andrew at acooke.org  Wed Feb  4 18:12:58 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 15:12:58 -0800 (PST)
Subject: Structuring Modules with a Ubiquitous Base Class (Circular 
	Dependencies)
References: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>
Message-ID: <b61d3f95-f02f-4a54-8d8a-b62b9285082f@r24g2000vbp.googlegroups.com>

On Feb 4, 7:49?pm, andrew cooke <and... at acooke.org> wrote:
> This leads to a circular dependency - the base class wants to import
> the components, which in turn want to import the base class.
>
> Is there any standard solution to this?

well, to partially answer my own question, this is certainly
possible.  in the general case it might get quite complex, but for the
structure described it is quite simple.  the 'trick' is to import the
component in the *method* of the common base class.

for example:

class Base(object):

    def __init__(self):
        from first import First
        from second import Second
        self.first = lambda *args: First(*args)
        self.second = lambda *args: Second(*args)

where First, defined in first, subclasses Base in the normal way.

however, i suspect this will have a performance hit, since "linking"
is being done at "run time" rather than "compile time".  anyone have
any guidance on how serious that would be?  i guess it could be
ameliorated by doing the work in the constructor (as above, which is
just that way for a compact example - in "real life" the components
are used in a more complex manner).

and i still suspect there is a more efficient metaclass or similar
approach.

andrew


From lionel.keene at gmail.com  Wed Feb  4 18:37:11 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 15:37:11 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
	<mailman.8809.1233789036.3487.python-list@python.org>
Message-ID: <b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>

On Feb 4, 3:10?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> Hello everyone. Quick question: When using the "read()" method in the
> ?> array module, must I redirect the current file pointer or will that
> ?> occur automatically?
> ?>
> ?> For example, if I were to sequentially read data in chunks from a
> ?> binary file as in:
> ?>
> ?>
> ?> for currentChunk in range(numberOfChunksToRead):
> ?>
> ?> ? ? ? ?floatData = array.array('f')
> ?> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ?> ? ? ? ?...go to work on data...
> ?>
> ?>
> ?> at each iteration of the "for" loop, will the next chunk of bytes be
> ?> read into "floatData" or must I move the file pointer by calling "seek
> ?> ()" or some function like that?
> ?>
> The read() method has been deprecated since version Python 1.5.1. Use
> the fromfile() method instead.
>
> It will advance the file pointer.

Thank you, I'll change it. On a related matter, I seem to be making a
mistake somewhere in the way I'm importing and using modules (in
particular the "array" module).

The following code generates an error (traceback message follows
code):

import pdb
import array
from numpy import *

class MyClass:

    def __init__(self, initialData):

        test = array.array('f')  # Trigger error message



The traceback message is:

test = array.array('f')
AttributeError: 'builtin_function_or_method' object has no attribute
'array'

According to the Python 2.5 documentation for the "array" module it
does have an "array" method. I'm closely following examples I've found
online (here, for ex: http://www.python.org/search/hypermail/python-1993/0393.html)
but don't see my error.

This error goes away if I change the import statement to:

import pdb
from array import *
from numpy import *

and the instruction to

test = array('f')

but then I get another error (sorry I don't have it handy) that
implies Python is interpreting the object returned from "array('f')"
as a numpy.ndarray object. Something I'm doing is causing ambiguity it
seems.

Anyone? As always, thank you for the help.

L


From andrew at acooke.org  Wed Feb  4 18:49:00 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 4 Feb 2009 15:49:00 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <5ef6e64b-1468-4ee2-8261-3ba027ca5370@p2g2000prf.googlegroups.com>

On Feb 4, 8:06?pm, len <lsumn... at gmail.com> wrote:
> How does one find the methods that are available in the classes.

heh.  welcome to the wonderful world of wxpython :o(

if you use eclipse to edit your code, then (providing the wind is in
the right direction and the file you are editing doesn't have any
syntax errors) pressing F3 when you are on a particular method will
take you to the definition.  or, at least, one of the definitions with
that name.

and if you want to see a list of available methods the simplest way is
to use tab completion (or dir() in python itself).

if you're not using eclipse (with pydev) check to see if the ide/
editor you are using has something similar.

also, wxpython comes with some examples, all packaged in a demo
program.  that is your best source of documentation.  go through all
the examples in there and look at the code (the demo program will show
you the code and even let you edit it and see the results of your
changes).

to be honest, wxpython is a bit of a nightmare (imho). but the results
can be worth it.

good luck,
andrew


From rhodri at wildebst.demon.co.uk  Wed Feb  4 19:09:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 00:09:08 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
Message-ID: <op.uouqpiaya8ncjz@gnudebst>

On Wed, 04 Feb 2009 17:23:55 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> I guess what I am saying is that it does not seem like I am adding any
> information that is not already there when I have to enter that list and
> list name after all they are the same.
> Thanks

But you are.  Consider just for a moment what happens when you execute
savedata([1, 2, 3, 55]).

Fundamentally, the concept of a single unique name for any object isn't
something built into the language (or, indeed, most languages I can think
of).  An object can have no names (though it'll promptly get garbage
collected if it isn't assigned to a name somehow), or just as easily
one or many names.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From digitig at gmail.com  Wed Feb  4 19:14:22 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:14:22 +0000
Subject: Couple of noobish question
In-Reply-To: <498a1b1d$0$24204$426a74cc@news.free.fr>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
Message-ID: <aee48b3c0902041614w535473c3wd2b7c1ec2cb3e7eb@mail.gmail.com>

2009/2/4 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr>:

> # somemodule.py
>
> import os
>
> if os.uname()[0] == "Linux":

On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
doesn't seem to contain uname. Is that a Linux thing? Would os.name
work on Linux? Or would one have to use exception handling and catch
the Windows case?

That's the trouble with using anything in os, of course -- it's os
dependent, which is why it's there! :-)

-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 19:18:03 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:18:03 +0000
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
Message-ID: <aee48b3c0902041618s6d49cb85n3435b97c754a1bfa@mail.gmail.com>

2009/2/4 Scott David Daniels <Scott.Daniels at acm.org>:
> joviyach wrote:
>>
>> I am fairly new to Python, the first version I loaded was 2.6. I have
>> since downloaded 3.0 and I was wondering what the best practice for
>> upgrading is? I am using Windows XP Pro for my OS.
>
> On Windows, X.Y.* all go in one directory (over-riding each other)
> So the whole 2.6.* family should work just fine alongside the 3.0.*

Just don't try to have a 2.6 version of Idle and a 3.0 version of Idle
running at the same time! 2.6 WinPy and 3.0 Idle seem to coexist ok,
which is handy when I'm trying to get to grips with the differences
between versions..

-- 
Tim Rowe


From Scott.Daniels at Acm.Org  Wed Feb  4 19:29:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 04 Feb 2009 16:29:37 -0800
Subject: sys.float_info.epsilon
In-Reply-To: <mailman.8806.1233784046.3487.python-list@python.org>
References: <mailman.8799.1233775108.3487.python-list@python.org>	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<mailman.8806.1233784046.3487.python-list@python.org>
Message-ID: <B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>

I wrote:
 > You are missing the whole thing that mes floating point tricky....
 > The reason it is tough is that addition is not associative in real
 > numbers, and associativity is at the core > of a lot of proofs in
 > arithmetic (and group theory).

In response to which Tim Rowe wrote:
> ... Thanks for that. It makes me feel guilty to point out that:
> >   addition is not associative in real numbers
> should presumably be "addition is not associative in floating point numbers".

And, of course he is right (and didn't even whomp on my typo of "makes"
as "mes in the first line quoted above).

--Scott David Daniels
Scott.Daniels at Acm.Org


From afriere at yahoo.co.uk  Wed Feb  4 19:31:24 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Wed, 4 Feb 2009 16:31:24 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com> 
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
Message-ID: <e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>

On Feb 5, 11:14?am, Tim Rowe <digi... at gmail.com> wrote:

...

> On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
> doesn't seem to contain uname. Is that a Linux thing? Would os.name
> work on Linux? Or would one have to use exception handling and catch
> the Windows case?

It seems to be a Windows thing.  My Linux box gives me 'Linux' the
server gives me 'SunOS' and a Mac tells me 'Darwin'.  I'm still
running Python2.4 on the Windows box.  At least in that version on the
OS,  the 'os' module has no attribute 'uname',  On both Linux and
SunOS, os.name returns 'posix'.



From mdw at distorted.org.uk  Wed Feb  4 19:35:45 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Thu, 05 Feb 2009 00:35:45 +0000
Subject: structs
References: <mailman.8268.1233224504.3487.python-list@python.org>
	<lnwsc66tg7.fsf@nuthaus.mib.org> <ln6jx71iyq.fsf@nuthaus.mib.org>
Message-ID: <87zlh1lnz2.fsf.mdw@metalzone.distorted.org.uk>

Keith Thompson <kst-u at mib.org> writes:

> "Gary Herron" <gherron at islandtraining.com> writes:
>> Python *is* object-oriented
>
> I disagree. Care to provide proof of that statement?

AWOOGA!

The article I'm following up to (together with at least one other) is a
forgery, and the Followup-To header is set to comp.lang.c as part of an
effort to (a) disrupt that newsgroup, and (b) discredit Keith Thompson,
who is a respected and capable contributor to that group.

This is a request to other readers to take special care over responding
to controversial articles, and particularly to watch for strange
Followup-To headers.

Thanks for listening.

-- [mdw]


From digitig at gmail.com  Wed Feb  4 19:36:52 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:36:52 +0000
Subject: sys.float_info.epsilon
In-Reply-To: <B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>
References: <mailman.8799.1233775108.3487.python-list@python.org>
	<BLydnR6GecvmbBTUnZ2dnUVZ_rfinZ2d@pdx.net>
	<mailman.8806.1233784046.3487.python-list@python.org>
	<B7ydnXL_49zirxfUnZ2dnUVZ_rvinZ2d@pdx.net>
Message-ID: <aee48b3c0902041636x6b946364s9dd859a6de758e07@mail.gmail.com>

2009/2/5 Scott David Daniels <Scott.Daniels at acm.org>:

> And, of course he is right (and didn't even whomp on my typo of "makes"
> as "mes in the first line quoted above).

A typo for "makes" didn't bother me. Non-associativity of the real
numbers under addition risked making my whole world fall apart :-)


-- 
Tim Rowe


From digitig at gmail.com  Wed Feb  4 19:45:56 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 00:45:56 +0000
Subject: Couple of noobish question
In-Reply-To: <e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
	<e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com>
Message-ID: <aee48b3c0902041645p11030c98oa00833d951e9fb72@mail.gmail.com>

2009/2/5  <afriere at yahoo.co.uk>:
> On Feb 5, 11:14 am, Tim Rowe <digi... at gmail.com> wrote:
>
> ...
>
>> On an MS Windows system, os.uname()[0] raises an AttributeError -- sys
>> doesn't seem to contain uname. Is that a Linux thing? Would os.name
>> work on Linux? Or would one have to use exception handling and catch
>> the Windows case?
>
> It seems to be a Windows thing.  My Linux box gives me 'Linux' the
> server gives me 'SunOS' and a Mac tells me 'Darwin'.  I'm still
> running Python2.4 on the Windows box.  At least in that version on the
> OS,  the 'os' module has no attribute 'uname',  On both Linux and
> SunOS, os.name returns 'posix'.

Python in a Nutshell states that os.uname "exists only on certain
platforms", and in the code sample wraps it in a try statement. That
seems to be the safe way to go -- except (and I don't know much about
this) wouldn't code have to be digging into some pretty obscure
corners to find a difference between different posix implementations?


-- 
Tim Rowe


From todpose at hotmail.com  Wed Feb  4 20:02:48 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:02:48 -0800
Subject: Using while loop and if statement to tell if a binary has an odd or
	even number of 1's.
Message-ID: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>


Using while loop and if statement, I'm trying to get Python to tell me whether there are even or odd number of 1's in a binary representation.
For example, if I give Python a 00000111, then I want it to say that the binary representation given has an odd number of 1's.
If I give it 00010111, then it will tell me that there is an even number of 1's.
I'd appreciate any suggestion.
Thanks!
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From google at mrabarnett.plus.com  Wed Feb  4 20:10:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 01:10:49 +0000
Subject: Does array.read() move file pointer automatically?
In-Reply-To: <b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>	<mailman.8809.1233789036.3487.python-list@python.org>
	<b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
Message-ID: <498A3C99.5090208@mrabarnett.plus.com>

Lionel wrote:
 > On Feb 4, 3:10 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
 >> Lionel wrote:
 >>
 >>  > Hello everyone. Quick question: When using the "read()" method in the
 >>  > array module, must I redirect the current file pointer or will that
 >>  > occur automatically?
 >>  >
 >>  > For example, if I were to sequentially read data in chunks from a
 >>  > binary file as in:
 >>  >
 >>  >
 >>  > for currentChunk in range(numberOfChunksToRead):
 >>  >
 >>  >        floatData = array.array('f')
 >>  >        floatData.read(MyFileHandle, numberOfFloatsPerChunk)
 >>  >        ...go to work on data...
 >>  >
 >>  >
 >>  > at each iteration of the "for" loop, will the next chunk of bytes be
 >>  > read into "floatData" or must I move the file pointer by calling 
"seek
 >>  > ()" or some function like that?
 >>  >
 >> The read() method has been deprecated since version Python 1.5.1. Use
 >> the fromfile() method instead.
 >>
 >> It will advance the file pointer.
 >
 > Thank you, I'll change it. On a related matter, I seem to be making a
 > mistake somewhere in the way I'm importing and using modules (in
 > particular the "array" module).
 >
 > The following code generates an error (traceback message follows
 > code):
 >
 > import pdb
 > import array
 > from numpy import *
 >
[snip]
I think that numpy has a class called "array", so the "import *" will
result in the name "array" binding to that, thus hiding the module
called "array" that you've only just imported!



From cosmo_general at yahoo.com  Wed Feb  4 20:16:00 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Wed, 4 Feb 2009 17:16:00 -0800 (PST)
Subject: How to trigger a smart link?
Message-ID: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>

Hi All,

Using urllib2 can trigger CGI script in server side. However, I
encountered a problem of the so-called smart link. When a fairly large
site, the server needs to track the identifier of each request from
client, so it generated an ugly escape string attached on url. It
seems that I must get this ugly escape string first then I can can
fill the string into my url, and the CGI script on server side can be
triggered. For example,

http://whatever.com/submitreal.cgi?fp=3xD0TuGMp7C7gP1TRD

displays a submit form. If I just copy

http://whatever.com/submitreal.cgi

to url address, without the escape string ?fp=3xD0TuGMp7C7gP1TRD, the
browser will report error of 404

I found Python has a module of escape, but I don't know how to use
this module to solve the problem above. Or, I just wonder does urllib2
has such a method to handle smart link? Thanks!


Moddy Coder


From clp2 at rebertia.com  Wed Feb  4 20:18:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:18:25 -0800
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:
> Using while loop and if statement, I'm trying to get Python to tell me
> whether there are even or odd number of 1's in a binary representation.
> For example, if I give Python a 00000111, then I want it to say that the
> binary representation given has an odd number of 1's.
> If I give it 00010111, then it will tell me that there is an even number of
> 1's.
> I'd appreciate any suggestion.

Please define "binary representation". Do you mean a sequence of
bytes, an integer, a string of 0s and 1s, or something else entirely?

If it's a string of 0s and 1s, then:
is_even = zerosones.count('1') % 2 == 0

For an integer:
is_even = bin(the_int)[2:].count('1') % 2 == 0

For the others, I don't know offhand.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From matzke at berkeley.edu  Wed Feb  4 20:20:06 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Wed, 04 Feb 2009 17:20:06 -0800
Subject: Comparing two book chapters (text files)
Message-ID: <498A3EC6.4040607@berkeley.edu>

Hi all,

So I have an interesting challenge.  I want to compare two book 
chapters, which I have in plain text format, and find out (a) percentage 
similarity and (b) what has changed.

Some features make this problem different than what seems to be the 
standard text-matching problem solvable with e.g. difflib.  Here is what 
I mean:

* there is no guarantee that single lines from each file will be 
directly comparable -- e.g., if a few words are inserted into a 
sentence, then a chunk of the sentence will be moved to the next line, 
then a chunk of that line moved to the next, etc.

* Also, there are cases where paragraphs have been moved around, 
sections re-ordered, etc.  So it can't just be a "linear" match.

I imagine this kind of thing can't be all that hard in the grand scheme 
of things, but I couldn't find an easily applicable solution readily 
available.  I have advanced beginner python skills but am not quite 
where I could do this kind of thing from scratch without some guidance 
about the likely functions, libraries etc. to use.

PS: I am going to have to do this for multiple book chapters so various 
software packages, e.g. for windows, are not really usable.

Any help is much appreciated!!

Cheers,
Nick



-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From todpose at hotmail.com  Wed Feb  4 20:23:46 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:23:46 -0800
Subject: Using while loop and if statement to tell if a binary has an
	odd or even number of 1's.
In-Reply-To: <50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
Message-ID: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>


By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
Also, I'm interested in only using while loop and if statement to accomplish this task.
Thanks.> Date: Wed, 4 Feb 2009 17:18:25 -0800> Subject: Re: Using while loop and if statement to tell if a binary has an odd or even number of 1's.> From: clp2 at rebertia.com> To: todpose at hotmail.com> CC: python-list at python.org> > On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:> > Using while loop and if statement, I'm trying to get Python to tell me> > whether there are even or odd number of 1's in a binary representation.> > For example, if I give Python a 00000111, then I want it to say that the> > binary representation given has an odd number of 1's.> > If I give it 00010111, then it will tell me that there is an even number of> > 1's.> > I'd appreciate any suggestion.> > Please define "binary representation". Do you mean a sequence of> bytes, an integer, a string of 0s and 1s, or something else entirely?> > If it's a string of 0s and 1s, then:> is_even = zerosones.count('1') % 2 == 0> > For an integer:> is_even = bin(the_int)[2:].count('1') % 2 == 0> > For the others, I don't know offhand.> > Cheers,> Chris> > -- > Follow the path of the Iguana...> http://rebertia.com
_________________________________________________________________
The new Windows Live Messenger. You don?t want to miss this.
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From digitig at gmail.com  Wed Feb  4 20:25:50 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 01:25:50 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <aee48b3c0902041725o721ed8datdc052f6bfb69e2cb@mail.gmail.com>

2009/2/5 todpose at hotmail.com <todpose at hotmail.com>:
> Using while loop and if statement, I'm trying to get Python to tell me
> whether there are even or odd number of 1's in a binary representation.
> For example, if I give Python a 00000111, then I want it to say that the
> binary representation given has an odd number of 1's.
> If I give it 00010111, then it will tell me that there is an even number of
> 1's.
> I'd appreciate any suggestion.
> Thanks!

Looks like homework to me, so I'll just give a couple of suggestions.

If you're going to prompt the user for the number, you'll get a string
back, and that might be easier to work with than a number. So you need
to set a boolean value for the result, something like:
   even = True
(because so far you've seen zero 1's, and zero is even).

Then you need to loop over each character in the string -- there's
your loop -- and if (there's your if) it's a "1" change the truth
value of even:
    even = !even.

If it is a number rather than a string, you want to do much the same
thing but you'll need the >> and & operators.

Chris has already shown you how this would actually be done in Python,
but that doesn't match your assignment description.


-- 
Tim Rowe


From clp2 at rebertia.com  Wed Feb  4 20:27:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:27:38 -0800
Subject: How to trigger a smart link?
In-Reply-To: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>
References: <757efced-1082-43d8-8a39-5752e1b5bc4f@i20g2000prf.googlegroups.com>
Message-ID: <50697b2c0902041727l463235c9pe1fdc55d1ee02942@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:16 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi All,
>
> Using urllib2 can trigger CGI script in server side. However, I
> encountered a problem of the so-called smart link. When a fairly large
> site, the server needs to track the identifier of each request from
> client, so it generated an ugly escape string attached on url. It
> seems that I must get this ugly escape string first then I can can
> fill the string into my url, and the CGI script on server side can be
> triggered. For example,
>
> http://whatever.com/submitreal.cgi?fp=3xD0TuGMp7C7gP1TRD
>
> displays a submit form. If I just copy
>
> http://whatever.com/submitreal.cgi
>
> to url address, without the escape string ?fp=3xD0TuGMp7C7gP1TRD, the
> browser will report error of 404
>
> I found Python has a module of escape, but I don't know how to use
> this module to solve the problem above. Or, I just wonder does urllib2
> has such a method to handle smart link? Thanks!

I think you'll need to fetch whatever webpage contains the link with
the magic URL, and then use an HTML parser (e.g. BeautifulSoup or
lxml) to parse the URL out of the page. Then just fetch the URL you
obtained.
I doubt you can just generate the escape string yourself, you need the
cooperation of the CGI script on the other end; hence the need to
fetch the known page.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From david at boddie.org.uk  Wed Feb  4 20:27:49 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 05 Feb 2009 02:27:49 +0100
Subject: Cross platform compilation?
References: <mailman.8731.1233699257.3487.python-list@python.org>
Message-ID: <gmdfal$5m3$1@get-news01.get.basefarm.net>

On Tuesday 03 February 2009 03:59, John Harper wrote:

> Before I try to reverse engineer completely setup.py, is there
> something obvious that needs to be done to get it to use the right tool
> chain?

I think it's more complicated than that, though in an ideal world it
wouldn't have to be that way.

I created some patches for Python 2.4.4 a while ago to make it slightly
easier to cross-compile it:

  http://chaos.troll.no/~dboddie/Python/Greenphone/

There were patches to solve similar issues with the build system floating
around in the Python bug tracker. I had intended to help push those along
a bit, but lack of time prevented me from doing so.

The magic incantation that worked for me was this:

export HOST_PLATFORM=i386
export TARGET_TOOLS=$SOME_DIR/gcc-4.1.1-glibc-2.3.6/arm-linux/bin
export TARGET_PLATFORM=arm-linux

CC=$TARGET_TOOLS/$TARGET_PLATFORM-gcc \
    CXX=$TARGET_TOOLS/$TARGET_PLATFORM-g++ \
    ./configure --prefix=$TARGETDIR --enable-shared --enable-unicode=ucs4 \
    --build=$TARGET_PLATFORM --host=$HOST_PLATFORM

where SOME_DIR and TARGETDIR are appropriately set, of course. I did
experience issues with some extension modules, though.

> More generally, it seems like this would be something that lots of
> people would want to do. I'm surprised there isn't support for it built
> into the distributed version of Python, without having to hack all the
> setup files...?

I suppose people don't explicitly configure projects for cross-compilation
anymore, especially now that things like Scratchbox are used to fake the
build environment:

  http://www.scratchbox.org/

That might also be worth looking at, but you really have to buy in to its
way of working to use it fully, in my experience.

David


From todpose at hotmail.com  Wed Feb  4 20:28:06 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Wed, 4 Feb 2009 17:28:06 -0800
Subject: Feet and inches
Message-ID: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>


I'm trying to get Python to say:
 
Enter the height (in metres):
 
and convert whatever value to feet and inches. I've done this part as you can see below, but how can I terminate the program when user inputs a height less than 1/2 inch?
How can I also take into account all the cases that need an exception?
 
 
metres = float(raw_input("Enter the height (in metres): "))total_inches = 39.37 * metresfeet = int(total_inches/12)inches = int(round(total_inches - feet*12))if feet>=1:    print "It is " + str(feet) + " feet " + str(inches) + ' inches high.'if feet<1 and inches<0.5:    print "Error."
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From gnewsg at gmail.com  Wed Feb  4 20:36:01 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Wed, 4 Feb 2009 17:36:01 -0800 (PST)
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
Message-ID: <2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>

On 5 Feb, 01:18, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/4 Scott David Daniels <Scott.Dani... at acm.org>:
>
> > joviyach wrote:
>
> >> I am fairly new to Python, the first version I loaded was 2.6. I have
> >> since downloaded 3.0 and I was wondering what the best practice for
> >> upgrading is? I am using Windows XP Pro for my OS.
>
> > On Windows, X.Y.* all go in one directory (over-riding each other)
> > So the whole 2.6.* family should work just fine alongside the 3.0.*
>
> Just don't try to have a 2.6 version of Idle and a 3.0 version of Idle
> running at the same time! 2.6 WinPy and 3.0 Idle seem to coexist ok,
> which is handy when I'm trying to get to grips with the differences
> between versions..
>
> --
> Tim Rowe

Just out of curiosity, am I the only one who think that switching to
3.x right now is not a good idea?


--- Giampaolo
http://code.google.com/p/pyftpdlib


From vincent at vincentdavis.net  Wed Feb  4 20:36:17 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 18:36:17 -0700
Subject: Use list name as string
In-Reply-To: <op.uouqpiaya8ncjz@gnudebst>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
Message-ID: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>

if I start with
M = [1,3,5,7]
M is [1,3,5,7]
This seems one way, as [1,3,5,7] is not M in the sense that there is
no operation I can preform on [1,3,5,7] and get M back. Other than
asking/testing M==[1,3,5,7]
This seems fine to me. but when I savedata(M) it seems I should be
able to refer to both [1,3,5,7] and "M", "I mean I did just type it
why type it again)
My argument comes down to; we use M so we don't have to type
[1,3,5,7], I realize that this is in part because we might not no what
M will be.
This is starting to sound like double talk on my part, I have only
been programing in python for 2 weeks so my credibility is only that
of an outside that MAY have a reasonable way of thinking of this or at
least a feature I would like.

Thanks for the comments

by the way what is "**kwargs" I can't find any documentation on this?


Thanks
Vincent Davis




On Wed, Feb 4, 2009 at 5:09 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> On Wed, 04 Feb 2009 17:23:55 -0000, Vincent Davis <vincent at vincentdavis.net>
> wrote:
>
>> I guess what I am saying is that it does not seem like I am adding any
>> information that is not already there when I have to enter that list and
>> list name after all they are the same.
>> Thanks
>
> But you are.  Consider just for a moment what happens when you execute
> savedata([1, 2, 3, 55]).
>
> Fundamentally, the concept of a single unique name for any object isn't
> something built into the language (or, indeed, most languages I can think
> of).  An object can have no names (though it'll promptly get garbage
> collected if it isn't assigned to a name somehow), or just as easily
> one or many names.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From lionel.keene at gmail.com  Wed Feb  4 20:39:01 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 4 Feb 2009 17:39:01 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
	<mailman.8809.1233789036.3487.python-list@python.org>
	<b4d19a51-670b-4c78-b375-f6ebda6deda0@g39g2000pri.googlegroups.com>
	<mailman.8816.1233796246.3487.python-list@python.org>
Message-ID: <b5d0e328-be34-4722-83bb-f1e83858ca95@o40g2000prn.googlegroups.com>

On Feb 4, 5:10?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> On Feb 4, 3:10 pm, MRAB <goo... at mrabarnett.plus.com> wrote:?>> Lionel wrote:
>
> ?>>
> ?>> ?> Hello everyone. Quick question: When using the "read()" method in the
> ?>> ?> array module, must I redirect the current file pointer or will that
> ?>> ?> occur automatically?
> ?>> ?>
> ?>> ?> For example, if I were to sequentially read data in chunks from a
> ?>> ?> binary file as in:
> ?>> ?>
> ?>> ?>
> ?>> ?> for currentChunk in range(numberOfChunksToRead):
> ?>> ?>
> ?>> ?> ? ? ? ?floatData = array.array('f')
> ?>> ?> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ?>> ?> ? ? ? ?...go to work on data...
> ?>> ?>
> ?>> ?>
> ?>> ?> at each iteration of the "for" loop, will the next chunk of bytes be
> ?>> ?> read into "floatData" or must I move the file pointer by calling
> "seek
> ?>> ?> ()" or some function like that?
> ?>> ?>
> ?>> The read() method has been deprecated since version Python 1.5.1. Use
> ?>> the fromfile() method instead.
> ?>>
> ?>> It will advance the file pointer.
> ?>
> ?> Thank you, I'll change it. On a related matter, I seem to be making a
> ?> mistake somewhere in the way I'm importing and using modules (in
> ?> particular the "array" module).
> ?>
> ?> The following code generates an error (traceback message follows
> ?> code):
> ?>
> ?> import pdb
> ?> import array
> ?> from numpy import *
> ?>
> [snip]
> I think that numpy has a class called "array", so the "import *" will
> result in the name "array" binding to that, thus hiding the module
> called "array" that you've only just imported!

I believe that's correct. I've gotten it to work by changing the
import statements to:

import pdb
import array
import numpy

and then I qualify the module specific attributes as either
"numpy.SomeAttribute" or "array.SomeAttribute" to avoid this namespace
ambiguity.

Thanks for the input!

L



From clp2 at rebertia.com  Wed Feb  4 20:39:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 4 Feb 2009 17:39:28 -0800
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
	<BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
Message-ID: <50697b2c0902041739m726936f2w33138add2ffd1f14@mail.gmail.com>

A "byte" is *not* a Python type. My question was what *Python type*
(i.e. bytes (which is distinctly different from the abstract notion of
a byte), str/unicode, int, etc...) you were using for you "binary
representation", which you still haven't answered.
Also, please don't reply by top-posting
(http://en.wikipedia.org/wiki/Top_post#Top-posting), it's bad
netiquette. I'm only doing it in this message for consistency.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


On Wed, Feb 4, 2009 at 5:23 PM, todpose at hotmail.com <todpose at hotmail.com> wrote:
> By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
> Also, I'm interested in only using while loop and if statement to accomplish
> this task.
> Thanks.
>
>> Date: Wed, 4 Feb 2009 17:18:25 -0800
>> Subject: Re: Using while loop and if statement to tell if a binary has an
>> odd or even number of 1's.
>> From: clp2 at rebertia.com
>> To: todpose at hotmail.com
>> CC: python-list at python.org
>>
>> On Wed, Feb 4, 2009 at 5:02 PM, todpose at hotmail.com <todpose at hotmail.com>
>> wrote:
>> > Using while loop and if statement, I'm trying to get Python to tell me
>> > whether there are even or odd number of 1's in a binary representation.
>> > For example, if I give Python a 00000111, then I want it to say that the
>> > binary representation given has an odd number of 1's.
>> > If I give it 00010111, then it will tell me that there is an even number
>> > of
>> > 1's.
>> > I'd appreciate any suggestion.
>>
>> Please define "binary representation". Do you mean a sequence of
>> bytes, an integer, a string of 0s and 1s, or something else entirely?
>>
>> If it's a string of 0s and 1s, then:
>> is_even = zerosones.count('1') % 2 == 0
>>
>> For an integer:
>> is_even = bin(the_int)[2:].count('1') % 2 == 0
>>
>> For the others, I don't know offhand.
>>
>> Cheers,
>> Chris
>>
>> --
>> Follow the path of the Iguana...
>> http://rebertia.com
>
>
> ________________________________
> The new Windows Live Messenger. You don't want to miss this.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From crebert at ucsd.edu  Wed Feb  4 20:41:41 2009
From: crebert at ucsd.edu (Chris Rebert)
Date: Wed, 4 Feb 2009 17:41:41 -0800
Subject: Comparing two book chapters (text files)
In-Reply-To: <498A3EC6.4040607@berkeley.edu>
References: <498A3EC6.4040607@berkeley.edu>
Message-ID: <50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>

On Wed, Feb 4, 2009 at 5:20 PM, Nick Matzke <matzke at berkeley.edu> wrote:
> Hi all,
>
> So I have an interesting challenge.  I want to compare two book chapters,
> which I have in plain text format, and find out (a) percentage similarity
> and (b) what has changed.
>
> Some features make this problem different than what seems to be the standard
> text-matching problem solvable with e.g. difflib.  Here is what I mean:
>
> * there is no guarantee that single lines from each file will be directly
> comparable -- e.g., if a few words are inserted into a sentence, then a
> chunk of the sentence will be moved to the next line, then a chunk of that
> line moved to the next, etc.
>
> * Also, there are cases where paragraphs have been moved around, sections
> re-ordered, etc.  So it can't just be a "linear" match.
>
> I imagine this kind of thing can't be all that hard in the grand scheme of
> things, but I couldn't find an easily applicable solution readily available.
>  I have advanced beginner python skills but am not quite where I could do
> this kind of thing from scratch without some guidance about the likely
> functions, libraries etc. to use.
>
> PS: I am going to have to do this for multiple book chapters so various
> software packages, e.g. for windows, are not really usable.

Though not written in Python, wdiff
(http://www.gnu.org/software/wdiff/wdiff.html) might be a good
starting point.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From python.list at tim.thechases.com  Wed Feb  4 20:43:15 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 19:43:15 -0600
Subject: Using while loop and if statement to tell if a binary has an
	odd or	even number of 1's.
In-Reply-To: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>
Message-ID: <498A4433.7070600@tim.thechases.com>

> Using while loop and if statement, I'm trying to get Python to
> tell me whether there are even or odd number of 1's in a
> binary representation. For example, if I give Python a
> 00000111, then I want it to say that the binary representation
> given has an odd number of 1's. If I give it 00010111, then it
> will tell me that there is an even number of 1's. I'd
> appreciate any suggestion.

A couple come to mind.  First, start by counting the bits.  If 
it's a string, this is easy:

   b = "00010111"
   result = b.count('1')

If it's an integer datatype instead of as string, as long as you 
know the number of bits to expect, you can use

   x = 0xf7
   result = sum((x >> i) & 1 for i in range(8))

where 8 is the number of bits you expect.  If you don't know the 
number of bits to expect, you'd have to do it in a more 
open-ended loop:

   x = 0xDEADBEEF
   result = 0
   while x:
     result += x & 1
     x >>= 1

Once you have the resulting count, you can then check if it's 
even or odd:

   if result & 1:
     print "Odd"
   else:
     print "Even"

Hope this helps,

-tkc






From afriere at yahoo.co.uk  Wed Feb  4 20:44:41 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Wed, 4 Feb 2009 17:44:41 -0800 (PST)
Subject: Couple of noobish question
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com> 
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org> 
	<e5587d49-fc2e-471e-aac4-45d77a6c40bb@z28g2000prd.googlegroups.com> 
	<mailman.8814.1233794763.3487.python-list@python.org>
Message-ID: <6ff716b0-6111-4b20-b060-b52dea45cf14@w1g2000prm.googlegroups.com>

On Feb 5, 11:45?am, Tim Rowe <digi... at gmail.com> wrote:


[snip]

> Python in a Nutshell states that os.uname "exists only on certain
> platforms", and in the code sample wraps it in a try statement. That
> seems to be the safe way to go -- except (and I don't know much about
> this) wouldn't code have to be digging into some pretty obscure
> corners to find a difference between different posix implementations?

Perhaps not, if the particular posix implementation is Mac OSX.  I
would think that trying os.uname() first and then os.name if it throws
will give you the clearest picture of which OS you are facing.
Alternatively you could query os.name and if that says 'posix' proceed
to call os.uname().


From digitig at gmail.com  Wed Feb  4 20:58:24 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 01:58:24 +0000
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
Message-ID: <aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>

2009/2/5 Giampaolo Rodola' <gnewsg at gmail.com>:

> Just out of curiosity, am I the only one who think that switching to
> 3.x right now is not a good idea?

I'm looking at making the switch, but I'm put off by the lack of 3rd
party stuff such as PyWin (and I can't see a NumPy build for Python
2.6 yet, never mind 3.0). Unless all you want is in the standard
library, I think it's worth the general user holding back for a while
whilst the tool providers catch up.


-- 
Tim Rowe


From rhodri at wildebst.demon.co.uk  Wed Feb  4 21:01:12 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 02:01:12 -0000
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <op.uouvwa0xa8ncjz@gnudebst>

On Thu, 05 Feb 2009 01:28:06 -0000, todpose at hotmail.com  
<todpose at hotmail.com> wrote:

> I'm trying to get Python to say:
> Enter the height (in metres):
> and convert whatever value to feet and inches. I've done this part as  
> you can see below, but [...]

Holy homework, you are busy tonight.  Hang on while I put the line breaks
back in your code.

> metres = float(raw_input("Enter the height (in metres): "))
> total_inches = 39.37 * metres
> feet = int(total_inches/12)
> inches = int(round(total_inches - feet*12))
> if feet>=1:
>    print "It is " +  str(feet) + " feet " + str(inches) + ' inches high.'
> if feet<1 and inches<0.5:
>    print "Error."

First things first: that line printing the result is making life harder
on yourself than you really need to, given that Python's print statement
(in 2.x -- it's a function from 3.0 onwards) will put spaces between items
for you, and will happily print out integers without needing to str() them.

     print "It is", feet, "feet", inches, "inches high."

Since the rest of this smells like homework, I'll answer your question with
questions.

> [...] how can I terminate the program when user inputs a height less
> than 1/2 inch?

First you have to make your program repeat itself, otherwise this question
is meaningless.  How would you do that?

Then, what methods do you have for stopping a loop in Python?  How would
you decide to make one of them happen?  What condition is "a height less
than 1/2 inch" in terms of your program?

(Hint: the condition isn't what I think you think it is -- remember that
"inches" is an int!)

> How can I also take into account all the cases that need an exception?

How do you take care of any exception?

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python.list at tim.thechases.com  Wed Feb  4 21:15:47 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 20:15:47 -0600
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <498A4BD3.3080906@tim.thechases.com>

> Enter the height (in metres):
>  
> and convert whatever value to feet and inches. I've done this
> part as you can see below, but how can I terminate the program
> when user inputs a height less than 1/2 inch?

Dang...I got suckered into answering a homework problem for the 
last one.  My apologies to the professor if they eavesdrop on the 
mailing list.  However, given the demonstrated skill level of the 
programmer, if you suspect your student got the answer from my 
reply, a fairly simple tweak of the problem would separate the 
wheat from the chaff.

For this one,

1) you're using the int() function, so fractional inches coming 
from the user don't really matter anyways.

2) read up on the "%" (modulo) operator, or check out the 
divmod() function in Python.

-tkc





From digitig at gmail.com  Wed Feb  4 21:17:08 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 02:17:08 +0000
Subject: Feet and inches
In-Reply-To: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
References: <BAY121-W286E73A3D851D55AE6D253B9C00@phx.gbl>
Message-ID: <aee48b3c0902041817n7fdbe05cme3b821f09c02c937@mail.gmail.com>

2009/2/5 todpose at hotmail.com <todpose at hotmail.com>:
> I'm trying to get Python to say:
>
> Enter the height (in metres):
>
> and convert whatever value to feet and inches.

This looks like another homework assignment. You'll probably get more
help (on *any* language forum) if you admit that up front. However, at
least this time you've shown us that you've made a good first attempt,
so here are a few hints.

> I've done this part as you
> can see below, but how can I terminate the program when user inputs a height
> less than 1/2 inch?

The program already terminates when the user inputs any height. If you
want it to *keep* asking you need to wrap it in some sort of loop.
Look up "while" and "break".

> How can I also take into account all the cases that need an exception?

I think your code already takes into account all the cases that need
an exception -- you just need to handle the exceptions. Try entering
some silly values for the height (try something like "one point three"
for example) and look at the exception you get. Then look up "try" and
"catch" to see what you might do about it. You might like to think
about what should happen if a user enters a negative value, but the
present behaviour -- when fixed -- may be what you need.

-- 
Tim Rowe


From python.list at tim.thechases.com  Wed Feb  4 21:31:49 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 04 Feb 2009 20:31:49 -0600
Subject: Use list name as string
In-Reply-To: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
Message-ID: <498A4F95.8050302@tim.thechases.com>

> My argument comes down to; we use M so we don't have to type
> [1,3,5,7], I realize that this is in part because we might not no what
> M will be.
> This is starting to sound like double talk on my part, I have only
> been programing in python for 2 weeks so my credibility is only that
> of an outside that MAY have a reasonable way of thinking of this or at
> least a feature I would like.

The problem (as pointed out elsewhere on the list), an argument 
to a function may have zero or more names at the time the 
function is called.  There *is* *no* canonical name for an 
object. If you want to name an object, pass it as a 
function-argument.  Or use its ID.  However, since Python has the 
flexibility to handle any of the following:

   a = [1,2,3]
   b = [5,6,7]
   c = b

   foo([8,9,10])
   foo(a)
   foo(b)
   foo(c)

While for the b/c name conflict (both refer to the same object), 
might be hackable by sniffing the call-stack, the anonymous 
[8,9,10] argument has *no* name, and thus your function is stuck.

> by the way what is "**kwargs" I can't find any documentation on this?

There's a quick example here:

http://mail.python.org/pipermail/python-list/2007-June/443934.html

-tkc





From dchandran1 at tinkercell.com  Wed Feb  4 21:41:47 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Wed, 4 Feb 2009 18:41:47 -0800
Subject: Embedded python output capture
Message-ID: <5dfe78f40902041841j1424bcacke4239991207507b8@mail.gmail.com>

I have a program with embedded Python. If the python code has print
statements, how do I retrieve those values (which normally go to stdout)?
The output from Py_RunString is just NULL
Thanks.
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From sjmachin at lexicon.net  Wed Feb  4 21:45:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 4 Feb 2009 18:45:51 -0800 (PST)
Subject: Does array.read() move file pointer automatically?
References: <fdde3943-3e59-4ccd-bbb6-88467e18eee9@i24g2000prf.googlegroups.com>
Message-ID: <283e98d0-8e0d-44eb-b170-43afb70c616f@r15g2000prd.googlegroups.com>

On Feb 5, 9:51?am, Lionel <lionel.ke... at gmail.com> wrote:
> Hello everyone. Quick question: When using the "read()" method in the
> array module, must I redirect the current file pointer or will that
> occur automatically?
>
> For example, if I were to sequentially read data in chunks from a
> binary file as in:
>
> for currentChunk in range(numberOfChunksToRead):
>
> ? ? ? ?floatData = array.array('f')
> ? ? ? ?floatData.read(MyFileHandle, numberOfFloatsPerChunk)
> ? ? ? ?...go to work on data...
>
> at each iteration of the "for" loop, will the next chunk of bytes be
> read into "floatData" or must I move the file pointer by calling "seek
> ()" or some function like that?

Suggestions for the the next time you have a question like that:

(1) Consider which outcome is more plausible, write your code
accordingly and see what happens

(2) If it blows up, or if you like looking before you leap anyway, try
inserting temporarily some code -- in this case
  print MyFileHandle.tell()
that will tell you the answer to your question.

In this game you are allowed to experiment to get an answer, and it's
often faster than phone-a-friend :-)


From kmcbrearty at yahoo.com  Wed Feb  4 21:49:21 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Wed, 4 Feb 2009 18:49:21 -0800 (PST)
Subject: JDBC in CPYTHON
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>
	<mailman.8802.1233782196.3487.python-list@python.org>
Message-ID: <63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>

Thanks Simon and Marc,

I currently have an app on OSX that I wanted to migrate to NIX, it
uses a ODBC DBAPI interface to communicate with Filemaker.
Unfortunately, FMP does not support linux drivers.  They do have a
JDBC driver that looks like it may work.  My preference was to run
that app on one machine.

I may not be understand your suggestion Marc, can the app and bridge
run on the same machine.  Can I specify the ODBC to a localhost, being
the bridge?  Then have the JDBC driver installed.

Also, your second link does not seam to have a download or anything in
the CVS.

Thanks,
       KMCB



From rhodri at wildebst.demon.co.uk  Wed Feb  4 21:55:04 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 05 Feb 2009 02:55:04 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
Message-ID: <op.uouyd20ma8ncjz@gnudebst>

On Thu, 05 Feb 2009 01:36:17 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> if I start with
> M = [1,3,5,7]
> M is [1,3,5,7]
> This seems one way, as [1,3,5,7] is not M in the sense that there is
> no operation I can preform on [1,3,5,7] and get M back. Other than
> asking/testing M==[1,3,5,7]

Correct.  If you actually try that, you get this:

Python 2.5.2 (r252:60911, May  7 2008, 15:21:12)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> M = [1,3,5,7]
>>> M is [1,3,5,7]
False

This isn't just me being funny with your suggested syntax, it's
making an important point: the second [1,3,5,7] is an entirely
different object to the list we named M, it just happens to
contain the same data.

> This seems fine to me. but when I savedata(M) it seems I should be
> able to refer to both [1,3,5,7] and "M", "I mean I did just type it
> why type it again)
> My argument comes down to; we use M so we don't have to type
> [1,3,5,7], I realize that this is in part because we might not no what
> M will be.

That's an oversimplification, and you're battering away well past the
point where it works.  In any language, not just Python.

> This is starting to sound like double talk on my part, I have only
> been programing in python for 2 weeks so my credibility is only that
> of an outside that MAY have a reasonable way of thinking of this or at
> least a feature I would like.

The problem is you seem to be thinking in terms of objects having names.
They don't.  Names have objects.

What I mean by that is that when you type "M = [1,3,5,7]", you are saying
"when I say 'M', substitute in this list (not just one that looks like it,
this exact list".  When you type "N = M", similarly you get the name N
bound to the same exact list; if you then type "N[1] = 2" and print out
M, it'll show up as [1,2,5,7] -- it's still the same list under both names.
In effect (to oversimplify more than a bit), Python looks up the name
in a dictionary to get the object it represents.

The reverse lookup doesn't exist, largely because it isn't unique.  Our
[1,3,5,7] list has no idea what names, if any, refer to it, and in all
but the most trivial cases the information isn't really meaningful.
Suppose that we did have a "getvariablename" function, what would you
expect the following code to do?

def f(thing):
     print getvariablename(thing)

m = [1,3,5,7]
for n in m:
     f(n)


Should it say "n" for all of them?  Or "['n', 'thing']", since 'thing'
is after all a perfectly valid name for it?

Then what about this:

for i in range(len(m)):
     f(m[i])


Should it say "m[i]" for all of them, or "m[0]" "m[1]" and so on, or
what?

> by the way what is "**kwargs" I can't find any documentation on this?

http://docs.python.org/tutorial/controlflow.html#keyword-arguments

In a function definition, "**name" mops up all the keyword arguments
to the function that aren't explicit formal parameters into a
dictionary called "name", indexed by keyword.  "kwargs" seems to be
the traditional name to use.  So:

>>> def demo(action, **kwargs):
...   print kwargs
...
>>> demo(action="dummy", text="wombats are go")
{'text': 'wombats are go'}


You can also use it the other way round to expand a dictionary into
keyword parameters to a function call:

>>> myargs = { 'action': 'avoid', 'where': 'Camelot', 'because': 'it is a  
>>> silly place' }
>>> demo(**myargs)
{'because': 'it is a silly place', 'where': 'Camelot'}

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From steve at holdenweb.com  Wed Feb  4 21:58:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 21:58:44 -0500
Subject: Using while loop and if statement to tell if a binary has an
	odd or even number of 1's.
In-Reply-To: <BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
References: <BAY121-W2491CC264878CAFB9A2721B9C00@phx.gbl>	<50697b2c0902041718h5616c78p3420762fd546df3e@mail.gmail.com>
	<BAY121-W488075C811DDCD38C214C4B9C00@phx.gbl>
Message-ID: <gmdkl6$5t2$1@ger.gmane.org>

todpose at hotmail.com wrote:
> By "binary representation", I mean a byte of 0s and 1s. Example: 00000101
> Also, I'm interested in only using while loop and if statement
> to accomplish this task.
> Thanks.
> 
I smell homework. Do it yourself!
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb  4 22:15:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 04 Feb 2009 22:15:11 -0500
Subject: Upgrade 2.6 to 3.0
In-Reply-To: <aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>	<mailman.8812.1233793086.3487.python-list@python.org>	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
	<aee48b3c0902041758u606ad9cdhea1a68939631b558@mail.gmail.com>
Message-ID: <498A59BF.1030101@holdenweb.com>

Tim Rowe wrote:
> 2009/2/5 Giampaolo Rodola' <gnewsg at gmail.com>:
> 
>> Just out of curiosity, am I the only one who think that switching to
>> 3.x right now is not a good idea?
> 
> I'm looking at making the switch, but I'm put off by the lack of 3rd
> party stuff such as PyWin (and I can't see a NumPy build for Python
> 2.6 yet, never mind 3.0). Unless all you want is in the standard
> library, I think it's worth the general user holding back for a while
> whilst the tool providers catch up.
> 
> 
Take a look at the recent threads on the topic of the 3.0.1 release on
the python-dev list. There is some feeling that the 3.0 release was
unsatisfactory in certain ways. Some of the issues (including removal of
some obscure features that should have been removed in 3.0) will be
taken care of in 3.0.1.

In addition to that expect a 3.1 release before too long (say, within
the next six months) that will address some performance issues not
addressed in 3.0.1 and provide other optimizations and perhaps a small
list of new features. 3.0 is of remarkably good quality for a ".0"
release. Expect even better things in the future.

If you want to write portable code you can put into production now and
move to 3.0 when appropriate then write for 2.6, and 2.7 when and if it
comes out. Compile it with the -3 option and rewrite until it stops
raising warnings. It will then be relatively easy to move to 3.x when
the third-party library support you need is available.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jervisau at gmail.com  Wed Feb  4 22:24:48 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 5 Feb 2009 14:24:48 +1100
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>

On Thu, Feb 5, 2009 at 3:57 AM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Sorry for not being clear
> I would have something like this
> x = [1, 2, 3,5 ,6 ,9,234]
> Then
> def savedata(dataname): ..........
>
> savedata(x)
> this would save a to a file called x.csv This is my problem, getting the
> name to be x.csv which is the same as the name of the list.
> and the data in the file would be
> 1,2,3,5,6,9,234 this parts works

It sounds like you would _really_ like to attach a name to this list of data.

How about this terrible example to solve your problem.

x = dict(x=[1,2,3,5,6,9,234])

then
def savedata(dataname):
   # extract the first key(name) and value(data) from the dataname data type.
   try:
      name, data = dataname.items()[0]
   except AttributeError:
      raise TypeError("Expecting a datatype that declares method 'items' :).")
   # we could catch other exceptions here but I wont (like empty items).


now you have your name and your data variable.
This way you don't declare your variable name when calling savedata
but when you
create your variable.

Although you should really solve your problem by thinking about it
from a completely
different angle, maybe subclassing your datatype and adding a 'name'
attribute ? I'm
sure some of the others here have suggested that already.

Cheers,


From vincent at vincentdavis.net  Wed Feb  4 22:32:59 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 20:32:59 -0700
Subject: Use list name as string
In-Reply-To: <op.uouyd20ma8ncjz@gnudebst>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
	<op.uouyd20ma8ncjz@gnudebst>
Message-ID: <77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>

"The problem is you seem to be thinking in terms of objects having names.
They don't.  Names have objects."I agree this is my problem. This is not
correct terminology then?
The name of the object is anobject

Let me give another example and let me know if I am just beating a dead
horse.

In my current script I have may print statements to verify I am manipulating
my list as I hope.
I have many lines like;

print 'alist', alist

I need to print the names so I know what I am looking at on the output.
It would be nice if I could define fuction that did this
def lp(thelist):
    "magic occurs"

Then I could just type

lp(alist)

note I am entering the name which has an object that is a list. I am not
entering [1,3,5,7]
and it would

print 'alist' alist

Does it not seem reasonable to what to do this.


Vincent Davis
720-301-3003


On Wed, Feb 4, 2009 at 7:55 PM, Rhodri James <rhodri at wildebst.demon.co.uk>wrote:

> On Thu, 05 Feb 2009 01:36:17 -0000, Vincent Davis <
> vincent at vincentdavis.net> wrote:
>
>  if I start with
>> M = [1,3,5,7]
>> M is [1,3,5,7]
>> This seems one way, as [1,3,5,7] is not M in the sense that there is
>> no operation I can preform on [1,3,5,7] and get M back. Other than
>> asking/testing M==[1,3,5,7]
>>
>
> Correct.  If you actually try that, you get this:
>
> Python 2.5.2 (r252:60911, May  7 2008, 15:21:12)
> [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>> M = [1,3,5,7]
>>>> M is [1,3,5,7]
>>>>
>>> False
>
> This isn't just me being funny with your suggested syntax, it's
> making an important point: the second [1,3,5,7] is an entirely
> different object to the list we named M, it just happens to
> contain the same data.
>
>  This seems fine to me. but when I savedata(M) it seems I should be
>> able to refer to both [1,3,5,7] and "M", "I mean I did just type it
>> why type it again)
>> My argument comes down to; we use M so we don't have to type
>> [1,3,5,7], I realize that this is in part because we might not no what
>> M will be.
>>
>
> That's an oversimplification, and you're battering away well past the
> point where it works.  In any language, not just Python.
>
>  This is starting to sound like double talk on my part, I have only
>> been programing in python for 2 weeks so my credibility is only that
>> of an outside that MAY have a reasonable way of thinking of this or at
>> least a feature I would like.
>>
>
> The problem is you seem to be thinking in terms of objects having names.
> They don't.  Names have objects.
>
> What I mean by that is that when you type "M = [1,3,5,7]", you are saying
> "when I say 'M', substitute in this list (not just one that looks like it,
> this exact list".  When you type "N = M", similarly you get the name N
> bound to the same exact list; if you then type "N[1] = 2" and print out
> M, it'll show up as [1,2,5,7] -- it's still the same list under both names.
> In effect (to oversimplify more than a bit), Python looks up the name
> in a dictionary to get the object it represents.
>
> The reverse lookup doesn't exist, largely because it isn't unique.  Our
> [1,3,5,7] list has no idea what names, if any, refer to it, and in all
> but the most trivial cases the information isn't really meaningful.
> Suppose that we did have a "getvariablename" function, what would you
> expect the following code to do?
>
> def f(thing):
>    print getvariablename(thing)
>
> m = [1,3,5,7]
> for n in m:
>    f(n)
>
>
> Should it say "n" for all of them?  Or "['n', 'thing']", since 'thing'
> is after all a perfectly valid name for it?
>
> Then what about this:
>
> for i in range(len(m)):
>    f(m[i])
>
>
> Should it say "m[i]" for all of them, or "m[0]" "m[1]" and so on, or
> what?
>
>  by the way what is "**kwargs" I can't find any documentation on this?
>>
>
> http://docs.python.org/tutorial/controlflow.html#keyword-arguments
>
> In a function definition, "**name" mops up all the keyword arguments
> to the function that aren't explicit formal parameters into a
> dictionary called "name", indexed by keyword.  "kwargs" seems to be
> the traditional name to use.  So:
>
>  def demo(action, **kwargs):
>>>>
>>> ...   print kwargs
> ...
>
>> demo(action="dummy", text="wombats are go")
>>>>
>>> {'text': 'wombats are go'}
>
>
> You can also use it the other way round to expand a dictionary into
> keyword parameters to a function call:
>
>  myargs = { 'action': 'avoid', 'where': 'Camelot', 'because': 'it is a
>>>> silly place' }
>>>> demo(**myargs)
>>>>
>>> {'because': 'it is a silly place', 'where': 'Camelot'}
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From vincent at vincentdavis.net  Wed Feb  4 22:37:04 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 4 Feb 2009 20:37:04 -0700
Subject: Use list name as string
In-Reply-To: <8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
Message-ID: <77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>

Jervis Whitley wrote "Although you should really solve your problem by
thinking about it
from a completely different angle, maybe subclassing your datatype and
adding a 'name'
attribute ? I'm sure some of the others here have suggested that already."
That is beyond my current knowledge. Any suggestions for reading about this?

Thanks
Vincent Davis



On Wed, Feb 4, 2009 at 8:24 PM, Jervis Whitley <jervisau at gmail.com> wrote:

> On Thu, Feb 5, 2009 at 3:57 AM, Vincent Davis <vincent at vincentdavis.net>
> wrote:
> > Sorry for not being clear
> > I would have something like this
> > x = [1, 2, 3,5 ,6 ,9,234]
> > Then
> > def savedata(dataname): ..........
> >
> > savedata(x)
> > this would save a to a file called x.csv This is my problem, getting the
> > name to be x.csv which is the same as the name of the list.
> > and the data in the file would be
> > 1,2,3,5,6,9,234 this parts works
>
> It sounds like you would _really_ like to attach a name to this list of
> data.
>
> How about this terrible example to solve your problem.
>
> x = dict(x=[1,2,3,5,6,9,234])
>
> then
> def savedata(dataname):
>   # extract the first key(name) and value(data) from the dataname data
> type.
>   try:
>      name, data = dataname.items()[0]
>   except AttributeError:
>      raise TypeError("Expecting a datatype that declares method 'items'
> :).")
>   # we could catch other exceptions here but I wont (like empty items).
>
>
> now you have your name and your data variable.
> This way you don't declare your variable name when calling savedata
> but when you
> create your variable.
>
> Although you should really solve your problem by thinking about it
> from a completely
> different angle, maybe subclassing your datatype and adding a 'name'
> attribute ? I'm
> sure some of the others here have suggested that already.
>
> Cheers,
>
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From matzke at berkeley.edu  Wed Feb  4 22:38:57 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Wed, 04 Feb 2009 19:38:57 -0800
Subject: Comparing two book chapters (text files)
In-Reply-To: <50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>
References: <498A3EC6.4040607@berkeley.edu>
	<50697b2c0902041741w3ad7365ay8dbcab7b9cc3216e@mail.gmail.com>
Message-ID: <498A5F51.4030900@berkeley.edu>



Chris Rebert wrote:
> On Wed, Feb 4, 2009 at 5:20 PM, Nick Matzke <matzke at berkeley.edu> wrote:
>> Hi all,
>>
>> So I have an interesting challenge.  I want to compare two book chapters,
>> which I have in plain text format, and find out (a) percentage similarity
>> and (b) what has changed.
>>
>> Some features make this problem different than what seems to be the standard
>> text-matching problem solvable with e.g. difflib.  Here is what I mean:
>>
>> * there is no guarantee that single lines from each file will be directly
>> comparable -- e.g., if a few words are inserted into a sentence, then a
>> chunk of the sentence will be moved to the next line, then a chunk of that
>> line moved to the next, etc.
>>
>> * Also, there are cases where paragraphs have been moved around, sections
>> re-ordered, etc.  So it can't just be a "linear" match.
>>
>> I imagine this kind of thing can't be all that hard in the grand scheme of
>> things, but I couldn't find an easily applicable solution readily available.
>>  I have advanced beginner python skills but am not quite where I could do
>> this kind of thing from scratch without some guidance about the likely
>> functions, libraries etc. to use.
>>
>> PS: I am going to have to do this for multiple book chapters so various
>> software packages, e.g. for windows, are not really usable.
> 
> Though not written in Python, wdiff
> (http://www.gnu.org/software/wdiff/wdiff.html) might be a good
> starting point.


Wow -- this is actually amazingly effective.  And fast!   Simple to run 
from python & then use python to parse the output.

Thanks!
Nick


> 
> Cheers,
> Chris
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From jervisau at gmail.com  Wed Feb  4 22:53:28 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 5 Feb 2009 14:53:28 +1100
Subject: Use list name as string
In-Reply-To: <77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<8e63a5ce0902041924h55c7964di3b6a415a0a4dff2d@mail.gmail.com>
	<77e831100902041937i2668897dm733747201429f9d6@mail.gmail.com>
Message-ID: <8e63a5ce0902041953r300ddf75h87760d0752a7f8e7@mail.gmail.com>

On Thu, Feb 5, 2009 at 2:37 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Jervis Whitley wrote "Although you should really solve your problem by
> thinking about it
> from a completely different angle, maybe subclassing your datatype and
> adding a 'name'
> attribute ? I'm sure some of the others here have suggested that already."
> That is beyond my current knowledge. Any suggestions for reading about this?
> Thanks
> Vincent Davis

Here is a short example, more information on 'Inheritance' can be obtained from
http://docs.python.org/tutorial/classes.html

class NamedList(list):
    """A List with a 'name' attribute."""
    def __init__(self, name, *args, **keyword_arguments):
        list.__init__(self, *args, **keyword_arguments)
        self.name = name


you can now do this

x = NamedList('x', [1,2,3,4])
>>> x.name
'x'

In this example I have inherited all the features of the original
built-in list, and added my
own initialisation method.

of course this is only a minimal example and there are other
approaches (such as adding an attribute
at runtime) but this one
is self documenting to some extent.

Cheers,


From aahz at pythoncraft.com  Thu Feb  5 00:09:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 4 Feb 2009 21:09:58 -0800
Subject: Use list name as string
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<mailman.8810.1233792569.3487.python-list@python.org>
Message-ID: <gmdsb6$18$1@panix3.panix.com>

In article <mailman.8810.1233792569.3487.python-list at python.org>,
Rhodri James <rhodri at wildebst.demon.co.uk> wrote:
>
>Fundamentally, the concept of a single unique name for any object isn't
>something built into the language (or, indeed, most languages I can think
>of).  An object can have no names (though it'll promptly get garbage
>collected if it isn't assigned to a name somehow), or just as easily
>one or many names.

Slight tangent: I prefer to use "binding target" ("target" for short) for
the generic term describing the left-hand side of an assignment
statement.  Consider

L[1] = C()

(where L is a list and C is a class)

It seems to me that while L and C are properly described as names, L[1]
is not really a name, it's an expression describing the location to be
used for binding.  (The Python docs also use this terminology, at least
some parts of them.)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From timr at probo.com  Thu Feb  5 00:35:30 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 05 Feb 2009 05:35:30 GMT
Subject: Find the critical points
References: <1b1b6f12-c910-4a13-902d-3523bfe8e3f5@u18g2000pro.googlegroups.com>
Message-ID: <3huko41tkcr916ijv7eimuev6baapbod6i@4ax.com>

antoniosacchi85 at gmail.com wrote:
>
>someone can help me??
>I am new to programing,
>but I need to make some script like this:
>http://blogs.nyu.edu/blogs/agc282/zia/2008/11/using_python_to_solve_optimiza.html
>so th equestion is :
>is possible to open it than it ask something and it tell me the
>result??

I'm not exactly sure what you're asking.  The script as you wrote it works,
but it was designed to be entered from the interactive interpreter, so if
you run it in a script it won't print anything.  Basically, just add
"print" in front of the expressions that you want printed:

>import sympy as S
>x,y=S.symbols('xy')
>f=x**4+x**2-6*x*y+3*y**2
>a=S.diff(f,x)
>S.pprint(a)
>b=S.diff(f,y)
>S.pprint(b)
>S.solve_system([a,b],[x,y])

print S.solve_system([a,b],[x,y])

>H=S.hessian(f,[x,y])
>M1=S.Matrix([14,-6],[-6,6])
>M2=S.Matrix([2,-6],[-6,6])
>S.Matrix.berkowitz_minors(M2)
>S.Matrix.berkowitz_minors(M1)

print S.Matrix.berkowitz_minors(M2)
print S.Matrix.berkowitz_minors(M1)
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tim--at-- at frontier--dot--.net  Thu Feb  5 01:35:13 2009
From: tim--at-- at frontier--dot--.net (Tim H)
Date: Wed, 04 Feb 2009 23:35:13 -0700
Subject: time: Daylight savings confusion
Message-ID: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>

On Win XP 64bit, Python 2.6.1 64bit

I am trying to rename files by their creation time.

It seems the time module is too smart for its own good here.

time.localtime(os.path.getctime(f)) returns a value one hour off from 
what windows reports for files that were created when Daylight savings 
time was in effect (ie when the tm_isdst field is one).  I can kludge 
it, but am I missing the "right" way to do it?

Tim

full code:
import os, time

filetypes = (".avi")

skipped = []
for f in os.listdir("."):
     root, ext = os.path.splitext(f)
     if ext in filetypes:
         creation_time = time.localtime(os.path.getctime(f))
         newname = time.strftime("%Y-%m-%d_%H%M" + ext, creation_time)
         if os.path.exists(newname):
             skipped.append(newname)
         else:
             os.rename(f, newname)
             print f, "->", newname
     else:
         skipped.append(f)

print
print "These files were skipped:"
for sf in skipped:
     print sf


From spacebar265 at gmail.com  Thu Feb  5 01:48:13 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Wed, 4 Feb 2009 22:48:13 -0800 (PST)
Subject: Scanning a file character by character
Message-ID: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>

Hi. Does anyone know how to scan a file character by character and
have each character so I can put it into a variable. I am attempting
to make a chatbot and need this to read the saved input to look for
spelling mistakes and further analysis of user input.
Thanks
Spacebar265


From mail at microcorp.co.za  Thu Feb  5 02:03:03 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 5 Feb 2009 09:03:03 +0200
Subject: Use list name as string
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com><77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<4989D545.4030409@mrabarnett.plus.com>
Message-ID: <012101c98765$78df0c20$0d00a8c0@hendrik>

 "MRAB" <google at mr....ett.plus.com> wrote:

> The actual names of the variables and functions shouldn't matter to the
> outside world; the name of an output file shouldn't depend on the name
> of a variable.

That is a matter of opinion. 
It is however, an interesting problem, namely:

How does one get hold of the actual name by which some parameter
is passed?

you may want to print, as a debug thingy:

print "the name passed in was: ", ImpossibleThingYieldingName
print "and it evaluates to:" , ArgumentPassed

to help you see from where your function was called,
and you can't, as far as I know, do this, because there 
is no backwards link from the object to all of its various names.

And while the OP can solve his problem by passing in the name explicitly,
as doStuff("banana",banana) it will do him no good if he gets the list 
returned from something else:

doStuff(WhatMustGoHere?,getlist())

Because in such a situation there is no backwards link to a name.

So to the OP :

Sorry - you can't get there from here.

- Hendrik




From elzapp at gmail.com  Thu Feb  5 02:03:06 2009
From: elzapp at gmail.com (Bard Aase)
Date: Wed, 4 Feb 2009 23:03:06 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <f5a45535-4bd4-454b-898e-c4f8c1953ec1@e18g2000vbe.googlegroups.com>

On 5 Feb, 07:48, Spacebar265 <spacebar... at gmail.com> wrote:
> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.
> Thanks
> Spacebar265

You can read one byte at the time using the read() method on the file-
object.
http://docs.python.org/library/stdtypes.html#file.read

e.g.:
f=open("myfile.txt")
byte=f.read(1)


From xahlee at gmail.com  Thu Feb  5 03:47:56 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 5 Feb 2009 00:47:56 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
Message-ID: <03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>

looking at the eXtreme Programing fuckheads's traffic history:
http://groups.google.com/group/comp.software.extreme-programming/about

for those who are not aware, it was one of the snake oil wildly
popular in around 2001.

  Xah
? http://xahlee.org/

?


Jason wrote:
I just started reading OnLisp and hit this quote:

Why wait for hindsight? As Montaigne found, nothing clarifies your
ideas like trying to write them down. Once you?re freed from the worry
that you?ll paint yourself into a corner, you can take full advantage
of this possibility. The ability to plan programs as you write them
has two momentous consequences: programs take less time to write,
because when you plan and write at the same time, you have a real
program to focus your attention; and they turn out better, because the
final design is always a product of evolution. So long as you maintain
a certain discipline while searching for your program?s destiny?so
long as you always rewrite mistaken parts as soon as it becomes clear
that they?re mistaken?the final product will be a program more elegant
than if you had spent weeks planning it beforehand.

I've always heard "design is 90% of the job. You have to have a good
design in place before writing anything."

This quote from OnLisp is a radical paradigm for me (being an engineer
who designs things). My question to you is does this apply in
practice? In the real world when the rubber hits the road, can you
program this way and develop good software used by lots of people?


-----------------

On Feb 4, 10:36 pm, Xah Lee <xah... at gmail.com> wrote:

yes and no. The problem is that such opinion is not a scientific
opinion. It can't be verified or denied.

Any dynamic lang, such as Python, PHP, Ruby, Mathematica can be said
the same thing. And, prob more so for functional langs.

The langs that this cannot be done, is C, Java, where the lang is
inflexible, low level, or requires big structure that's hard to
change.

if you want software engineering books, i suggest try some books that
are based on statistical survey, as opposed to some dignitary's
?opinion? or current fashion & trends that comes with a jargon. These
type of books are a dime a dozen, every year, they come and go. The
stastical survey approach takes major understaking and cost. The
opinion type any motherfucking ?guru? can write. e.g. Paul Graham has
you buy into certain concept of ?hackers? fucker and claim they are
like ?painters?. Certain Gabriel wants you to believe in poetry and C
is the last language. (see Book Review: Patterns of
Softwarehttp://xahlee.org/PageTwo_dir/Personal_dir/bookReviewRichardGabriel.html
) et al. Certain Gosling wants you to believe Java is the last lang on
earth that'll wipe out Microsoft (circa 1998).

Pascal Constanza wrote:
> Yes. There are actually complete software development methodologies
> built around these ideas. Google for "extreme programming" and "agile
> software methodologies".

Pascal Constanza is a Common Lisp fanatic. Note here, that eXtreme
Programing is one of the snake oil, that ran like rampant wild fire in
the industry around 2002, with many books published on it on the
supposed motherfucking hip Software Engineering practices, but today
you don't hear much of it. I haven't looked at ?Agile programing?
agile my ass, but it is probably a waste of time.

... what society overwhelmingly asks for is snake oil. Of course, the
snake oil has the most impressive names ?otherwise you would be
selling nothing? like ?Structured Analysis and Design?, ?Software
Engineering?, ?Maturity Models?, ?Management Information Systems?,
?Integrated Project Support Environments? ?Object Orientation? and
?Business Process Re-engineering? (the latter three being known as
IPSE, OO and BPR, respectively).? ? Edsger W Dijkstra (1930-2002), in
EWD 1175: The strengths of the academic enterprise.

you want to be a good programer? Study math, the math of programing,
and master the langs and protocols and tools you use. You want to
climb the tech industry ladder? get better at people, learn politics.
You want to be rich? Study business. Chances are, you are a coding
geek, and at heart you dna is not geared to be interested in politics
or business, and you'll never be rich or big ceo just because of that.

See also:
? Why Software Suck
 http://xahlee.org/UnixResource_dir/writ/why_software_suck.html

  Xah
? http://xahlee.org/

?



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 04:00:24 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 10:00:24 +0100
Subject: is python Object oriented??
In-Reply-To: <5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com>
	<018801c9850e$3e019fe0$0d00a8c0@hendrik>
	<7a9c25c20902020055p7b2b449ek9faf789a5d6e1452@mail.gmail.com>
	<003d01c98527$d9ea4ec0$0d00a8c0@hendrik>
	<gm6qoc$v0g$1@ger.gmane.org>
	<005201c98549$d3eb74a0$0d00a8c0@hendrik>
	<mailman.8661.1233621338.3487.python-list@python.org>
	<2ed10ddd-63ac-4507-b046-0404cc85c97a@s1g2000prg.googlegroups.com>
	<mailman.8668.1233632951.3487.python-list@python.org>
	<3acf1429-9aec-4e0d-b617-21cbcdf76087@w1g2000prk.googlegroups.com>
	<mailman.8678.1233645292.3487.python-list@python.org>
	<22440895-ed68-4643-b833-0befe83d571c@f40g2000pri.googlegroups.com>
	<49895bad$0$28683$426a74cc@news.free.fr>
	<5475ff03-2d41-4db1-a986-5124b166abfb@r15g2000prd.googlegroups.com>
Message-ID: <498aaa94$0$14156$426a74cc@news.free.fr>

thmpsn.m.k at gmail.com a ?crit :
> On Feb 4, 3:11 am, Bruno Desthuilliers <bruno.
> 42.desthuilli... at websiteburo.invalid> wrote:
>> thmpsn.... at gmail.com a ?crit :
>>
>>
>>
>>> On Feb 3, 1:14 am, David Cournapeau <courn... at gmail.com> wrote:
>> (snip)
>>>> after all, we have used FILE* for years and I have no idea about the FILE
>>>> structure.
>>> Your lack of knowledge about it doesn't mean that it has somehow
>>> magically "private" members. The only reason that most of us don't
>>> know what a FILE is is that it's definition is implementation-defined
>>> (i.e., every compiler may define it differently).
>>> That doesn't have anything to do with private members. For example, on
>>> my system, <stdio.h> defines FILE as:
>>> struct _iobuf {
>>>         char *_ptr;
>>>         int   _cnt;
>>>         char *_base;
>>>         int   _flag;
>>>         int   _file;
>>>         int   _charbuf;
>>>         int   _bufsiz;
>>>         char *_tmpfname;
>>>         };
>> Didn't you notice kind of a pattern here ?
> 
> You mean the leading underscores? I don't think they're used for the
> same purpose as in Python. 

Not exactly the same purpose, indeed, but there's still something close: 
mark the names as "special".

> In C/C++, identifiers that begin with an
> underscore are reserved (at least at the outer level). Thus, if the
> member '_ptr' would instead be named 'ptr', something like this would
> break things:
> 
> #define ptr // OOPS!!
> #include <stdio.h>
> 
> That shouldn't happen with '_ptr', since programs are not supposed to
> define those kinds of names (yeah, right).

And here again : "would break", "shouldn't", "supposed". Convention over 
enforcement.

>>> typedef struct _iobuf FILE;
>>> Given this information, nothing prevents me from writing things like:
>>> FILE* fp = fopen("file.txt", "r");
>>> if (!fp) { /* do something */ }
>>> printf("fp->_cnt = %d\n", fp->cnt);
>>> printf("fp->_flag = %d\n", fp->_flag);
>>> printf("fp->_file = %d\n", fp->_file);
>>> fp->_flag = 0x20; // OOPS!!
 >>
>> Indeed - and that's exactly the point : nothing prevents you from
>> accessing the implementation, *and yet, you don't*
> 
> I sure don't, but I still *can*.

So what ?

> CHAOS MAY ENSUE!!

C is not really a new technology, and has been the basis for most 
systems for years and years. Looks like nothing that bad as "CHAOS" 
really happened so far...


From dickinsm at gmail.com  Thu Feb  5 04:04:57 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 01:04:57 -0800 (PST)
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
References: mailman.8817.1233796709.3487.python-list@python.org
Message-ID: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>

On Feb 5, 1:18?am, Chris Rebert <c... at rebertia.com> wrote:
> For an integer:
> is_even = bin(the_int)[2:].count('1') % 2 == 0

But the OP has to use if and while.  How about:

while 2+2 != 5:
    if 'wkw' in 'just being awkward':
        is_even = bin(the_int)[2:].count('1') % 2 == 0
        break

or (Python 2.5 compatible):

def count_set_bits(n):
    # make sure we include an if, to
    # satisfy OP's requirements:
    if n < 0:
        raise ValueError
    count = 0
    while n:
        count += 1
        n &= n-1
    return count

is_even = count_set_bits(the_int) % 2 == 0

...but anyone submitting this as a homework
solution had better be prepared to explain why
it works.


Mark


From matzke at berkeley.edu  Thu Feb  5 04:08:25 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 01:08:25 -0800
Subject: global name 'sqrt' is not defined
Message-ID: <498AAC89.5080002@berkeley.edu>

Hi all,

So, I can run this in the ipython shell just fine:

===========
a = ["12", "15", "16", "38.2"]
dim = int(sqrt(size(a)))

dim
 >2
===========


But if I move these commands to a function in another file, it freaks out:


=================================
a = distances_matrix.split('\t')
from LR_run_functions_v2 import make_half_square_array
d = make_half_square_array(a)

 >
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/bioinformatics/phylocom/<ipython console> in <module>()

/bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
make_half_square_array(linear_version_of_square_array)
    1548
    1549         a = linear_version_of_square_array
-> 1550         dim = int(sqrt(size(a)))
    1551
    1552

NameError: global name 'sqrt' is not defined

=================================




Here's the function in LR_run_functions_v2.py

==========================
def make_half_square_array(linear_version_of_square_array):

	a = linear_version_of_square_array
	dim = int(sqrt(size(a)))
==========================



Any ideas?  If I do something like "import math" in the subfunction, 
then the error changes to "global name 'math' is not defined".

Thanks!
Nick







-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From tino at wildenhain.de  Thu Feb  5 04:13:24 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 10:13:24 +0100
Subject: Use list name as string
In-Reply-To: <77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
Message-ID: <498AADB4.3060704@wildenhain.de>

Hi,

Vincent Davis wrote:
> Sorry for not being clear
> I would have something like this
> x = [1, 2, 3,5 ,6 ,9,234]
> 
> Then
> def savedata(dataname): ..........
> 
> savedata(x)
> 
> this would save a to a file called x.csv This is my problem, getting the 
> name to be x.csv which is the same as the name of the list.
> 
> and the data in the file would be 
> 1,2,3,5,6,9,234 this parts works

the problem you are facing comes from a little misunderstanding.
To clarify:

python objects are nameless.

You can bind them to any number of names (aka variables)

 >>> 1 # unnamed integer object with value 1
1

 >>> a=1 # bind the integer object to name 'a'
 >>> b=a # bind the same integer object referred to by name a to name b

therefore in your above example, which "name" should your
savedata pick up for the filename? the 'x' of the first
assignment or the 'dataname' of the assignment in the function
call?

The only solution I see would be to add a property to your datastore
to give it its own unique name. (By subclassing and providing
a name attribute or property) - and while you are at it, maybe
you want to put the 'write to file' part into the class as well.

Regards
Tino

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From crebert at ucsd.edu  Thu Feb  5 04:19:44 2009
From: crebert at ucsd.edu (Chris Rebert)
Date: Thu, 5 Feb 2009 01:19:44 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <498AAC89.5080002@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
Message-ID: <50697b2c0902050119p65b0df7ei9cef4af4cc724986@mail.gmail.com>

On Thu, Feb 5, 2009 at 1:08 AM, Nick Matzke <matzke at berkeley.edu> wrote:
> Hi all,
>
> So, I can run this in the ipython shell just fine:
>
> ===========
> a = ["12", "15", "16", "38.2"]
> dim = int(sqrt(size(a)))

sqrt() is not a builtin function, it's located in the 'math' module.
You must have imported it at some point.
Or it could be be getting imported without your direct knowledge
through ~/.pythonrc.py, $PYTHONSTARTUP, and/or by doing 'import user'
For that matter, size() is not built into Python either, so you're
definitely importing these things somewhere.

Adding explicit imports of the modules/functions in question to the
top of the file(s) in question should fix the problem.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Ron.Barak at lsi.com  Thu Feb  5 04:27:38 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 5 Feb 2009 09:27:38 +0000
Subject: How to find wxPython method documentation??
In-Reply-To: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E6875B3@enbmail01.lsi.com>

Hi Len,
First off, there's the wxPython mailing list 
(To subscribe or unsubscribe via the World Wide Web, visit http://lists.wxwidgets.org/mailman/listinfo/wxpython-users or, via email, send a message with subject or body 'help' to wxpython-users-request at lists.wxwidgets.org)
I also find Google invaluable in searching for wxPython knowledge, e.g., try http://www.google.com/search?q=wxpython+dialog.
Bye,
Ron.

From egon.frerich at nord-com.net  Thu Feb  5 04:30:19 2009
From: egon.frerich at nord-com.net (Egon Frerich)
Date: Thu, 05 Feb 2009 10:30:19 +0100
Subject: How to find wxPython method documentation??
In-Reply-To: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <498AB1AB.3030307@nord-com.net>

-----BEGIN PGP SIGNED MESSAGE-----
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The documentation is here:

http://www.wxpython.org/onlinedocs.php

In "Alphabetical class reference" you can find for example wxButton with
its methods. Yes - there is no function 'SetBackgroundColour'. But there
is a list with classes from which wxButton is derived.
'SetBackgroundColour' is a method for all widgets so it is described in
~ class wxWindow.

Egon
len schrieb:
| Hi
|
| I am going through the "wxPython in Action" book by Noel Rappin and
| Robin Dunn.
|
| I have been typing in the example programs as I go and play with
| modifing the code.
| Thought I should start trying to find my way around the documentation
| found on the wxPython web site.
|
| The problem I have been having is I can't find the methods or more
| specifically
|
| 'SetBackgroundColour' or 'AddSimpleTool' for example.
|
| How does one find the methods that are available in the classes.
|
| I tried looking at the wxWidgets web site and still had the same
| problem.
|
| Could someone give me a little direction in this?
|
| Thanks
| Len
| --
| http://mail.python.org/mailman/listinfo/python-list

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From tino at wildenhain.de  Thu Feb  5 04:39:24 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 10:39:24 +0100
Subject: Use list name as string
In-Reply-To: <012101c98765$78df0c20$0d00a8c0@hendrik>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>	<4989C6D0.2000604@tim.thechases.com>	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>	<4989CB47.3060806@mrabarnett.plus.com>	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com><77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>	<4989D545.4030409@mrabarnett.plus.com>
	<012101c98765$78df0c20$0d00a8c0@hendrik>
Message-ID: <498AB3CC.3050806@wildenhain.de>

Hendrik van Rooyen wrote:
 >  "MRAB" <google at mr....ett.plus.com> wrote:
 >
 >> The actual names of the variables and functions shouldn't matter to the
 >> outside world; the name of an output file shouldn't depend on the name
 >> of a variable.
 >
 > That is a matter of opinion.
 > It is however, an interesting problem, namely:
 >
 > How does one get hold of the actual name by which some parameter
 > is passed?
 >
 > you may want to print, as a debug thingy:
 >
 > print "the name passed in was: ", ImpossibleThingYieldingName
 > print "and it evaluates to:" , ArgumentPassed

This is possible to some degree:

import inspect

def F(a):
     frame_obj,filename,line_no,
     func_name,contextlines,
     contextindex=(inspect.getouterframes(inspect.currentframe()))[1]
         print "F(%s) called from '%s' within '%s' line %d" %
               (repr(a),filename,func_name,line_no)
         for ln,srcline in enumerate(contextlines or []):
             print "%3s : %s" % ('*>' if ln==contextindex else '',srcline)


just play around calling the above function from different
places and you should see what I mean :-)

Regards
Tino
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From mnordhoff at mattnordhoff.com  Thu Feb  5 04:39:47 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 05 Feb 2009 09:39:47 +0000
Subject: time: Daylight savings confusion
In-Reply-To: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
References: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
Message-ID: <498AB3E3.1060804@mattnordhoff.com>

Tim H wrote:
> On Win XP 64bit, Python 2.6.1 64bit
> 
> I am trying to rename files by their creation time.
> 
> It seems the time module is too smart for its own good here.
> 
> time.localtime(os.path.getctime(f)) returns a value one hour off from
> what windows reports for files that were created when Daylight savings
> time was in effect (ie when the tm_isdst field is one).  I can kludge
> it, but am I missing the "right" way to do it?
> 
> Tim
> 
> full code:

<snip full code>

>From what I remember, this is a bug in the Win32 API. Python probably
could hack around it, but, well, I guess it doesn't.

Googling a bit, Perl's Win32::UTCFileTime module [1] provides
workarounds (not for Python, of course, but it could probably be ported)
and explains all the gory details (which I have not read, so maybe I
misunderstand ;-).

[1]
<http://search.cpan.org/~shay/Win32-UTCFileTime-1.50/lib/Win32/UTCFileTime.pm>
<http://xrl.us/beezsv>
-- 


From dickinsm at gmail.com  Thu Feb  5 04:40:52 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 01:40:52 -0800 (PST)
Subject: sys.float_info.epsilon
References: <mailman.8799.1233775108.3487.python-list@python.org> 
	<42b8c80f-b53c-4ec0-a1eb-c66410c60197@i18g2000prf.googlegroups.com> 
	<mailman.8805.1233783892.3487.python-list@python.org>
Message-ID: <5aa92561-8fec-4568-b19f-87ddc0c971e5@g1g2000pra.googlegroups.com>

On Feb 4, 9:44?pm, Tim Rowe <digi... at gmail.com> wrote:
> That just leaves me puzzled as to why Mark Summerfield used it instead
> of a check against zero on user input.

No idea:  you'd have to ask Mark Summerfield.  If there's
an email address published in his book, I'm sure he
wouldn't object to the question.

> So my next question is whether there is any x that can
> be returned by float() such that x != 0 but some_number / (2 * x)
> raises a ZeroDivisionError?

Nope.  If x is nonzero, then 2*x is definitely nonzero.
It could be an infinity, or a nan, or the '2*x'
computation could raise an exception, or perhaps
cause the interpreter to crash (it shouldn't, but
you never know...), but it's never going to be zero.

Well, okay, *never* is a strong word:  if 2*x is
subnormal, and you're operating on a platform that
for whatever reasons flushes subnormal results
to zero, then it could happen.  But not in *real*
life. :)

Mark


From andrew at acooke.org  Thu Feb  5 04:42:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 5 Feb 2009 01:42:05 -0800 (PST)
Subject: Comparing two book chapters (text files)
References: <mailman.8818.1233796861.3487.python-list@python.org>
Message-ID: <72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>

On Feb 4, 10:20?pm, Nick Matzke <mat... at berkeley.edu> wrote:
> So I have an interesting challenge. ?I want to compare two book
> chapters, which I have in plain text format, and find out (a) percentage
> similarity and (b) what has changed.

no idea if it will help, but i found this yesterday - http://www.nltk.org/

it's a python toolkit for natural language processing.  there's a book
at http://www.nltk.org/book with much more info.

andrew


From justin.mailinglists at gmail.com  Thu Feb  5 04:46:25 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 5 Feb 2009 01:46:25 -0800 (PST)
Subject: How do i add body to email.mime.multipart.MIMEMultipart instance?
References: <mailman.8835.1233801992.3487.python-list@python.org>
Message-ID: <69442cd1-7c20-4752-9280-ccaf237de218@r36g2000prf.googlegroups.com>

On Feb 4, 2:48?pm, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:
> Hi,
> Could someone tell me the way to add body to the instance email.mime.multipart.MIMEMultipart instance which has attachments?
>
> Thanks,

msg = MIMEMultipart()
msg.preamble = 'This is a multi-part message in MIME format.\n'
msg.epilogue = ''

body = MIMEMultipart('alternative')
body.attach(MIMEText(text))
body.attach(MIMEText(html, 'html'))

msg.attach(body)

attachment = Message()
attachment.add_header('Content-type', content_type,
                      name=basename)
attachment.add_header('Content-transfer-encoding', 'base64')
attachment.add_header('Content-Disposition', 'attachment',
                      filename=basename)
attachment.set_payload(b.getvalue())

msg.attach(attachment)

msg.add_header('Message-ID', generate_message_id(sender[1]))
msg.add_header('Date', strftime(DATEFORMAT, gmtime()))

msg.add_header('From', formataddr(sender))
msg.add_header('To', format_addresses(TOs))
msg.add_header('Cc', format_addresses(CCs))
msg.add_header('Subject', subj)



From bearophileHUGS at lycos.com  Thu Feb  5 04:47:24 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 01:47:24 -0800 (PST)
Subject: Ordered dict by default
Message-ID: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>

Choosing the right data structure is usually a matter of compromises,
and sometimes the best you can do is to change some data structures
and look for the faster running time. To do this it helps to have a
language that allows you to swap data structures in the more
transparent way possible.

It's not just a matter of the specific program, it's also a matter of
the nature of the programming language. Python isn't meant to be high-
performance in running time, it's meant to be easy to use, flexible,
and easy to understand. (Ruby shares almost the same purposes, but it
looks a bit less easy, a bit more flexible, and offers a bit more
freedom, and it used to be a little slower).

Now Ruby dicts are ordered by default:
http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/

Of course Python can grow odicts into its collections module, that can
be used everywhere a normal dict is used. But while this may be a good
solution for faster languages like Java, C# and D, for me it doesn't
sound like the best solution for Python.

That page about Ruby dicts show a higher traversal speed (probably
just because the CPU has to scan less memory, but I am not sure,
because mordern CPUs are very complex) but lower insertion speed (I
think mostly not because the added management of two pointers, but
because the memory used increases, so there are more cache misses. If
this turns out as true, then using the xor trick may halve the extra
memory needed). I have no idea if such different balance of
performance will lead to on average faster or slower Python programs,
this has to be tested. But even if the average performance becomes a
little worse I think making the default Python dict as ordered is a
positive change for Python too, because built-ins are meant to be as
flexible as possible, even if they aren't the fastest ones or the less
memory hungry ones (and keeping dicts ordered decreases the surprises
a newbie finds, makes some code cleaner, and doctests become simpler
to write because the order of items may be more defined).

Once the default dicts are ordered, it can be possible to add an
unordereddict to the collections module to be used by programmers when
max performance or low memory usage is very important :-)

Namespaces and other internal things of Python can keep using the un-
ordereddicts.

I don't know what to do regarding Python sets yet. In mathematics sets
aren't ordered, so they may be kept as they are now.

Bye,
bearophile


From duncan.booth at invalid.invalid  Thu Feb  5 04:56:51 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 09:56:51 GMT
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
Message-ID: <Xns9BA9651C7D77Aduncanbooth@127.0.0.1>

Mark Dickinson <dickinsm at gmail.com> wrote:

> def count_set_bits(n):
>     # make sure we include an if, to
>     # satisfy OP's requirements:
>     if n < 0:
>         raise ValueError
>     count = 0
>     while n:
>         count += 1
>         n &= n-1
>     return count
> 
> is_even = count_set_bits(the_int) % 2 == 0
> 
> ...but anyone submitting this as a homework
> solution had better be prepared to explain why
> it works.
> 

I remember a programming exercise when I was an undergraduate and anyone 
who *didn't* use that trick got marked down for writing inefficient code.

-- 
Duncan Booth http://kupuguy.blogspot.com


From robin at reportlab.com  Thu Feb  5 05:10:17 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 05 Feb 2009 10:10:17 +0000
Subject: x64 speed
In-Reply-To: <498A080D.3000703@egenix.com>
References: <mailman.8707.1233682582.3487.python-list@python.org>	<4988a1f1$0$3390$9b622d9e@news.freenet.de>	<4988B615.4060206@jessikat.plus.net>	<4988BAE8.2060204@v.loewis.de>	<49896AA0.2050202@chamonix.reportlab.co.uk>
	<498A080D.3000703@egenix.com>
Message-ID: <498ABB09.3050507@chamonix.reportlab.co.uk>

.......
>>> ----------------------------------------------------------------------
>>> Ran 193 tests in 27.841s
>>>
>>> OK
>>>
>>> real    0m28.150s
>>> user    0m26.606s
>>> sys     0m0.917s
>>> [rptlab at localhost tests]$
>> magical how the total python time is less than the real time.
> 
> time(1) also measures the Python startup and shutdown time, so
> I don't quite see the magic :-(
>

yes stupid me :(

> FWIW: VMware VMs need the VMware tools installed to make their
> clocks work more or less. With Linux, you need some extra tweaks
> as well, otherwise the clocks are just completely unreliable.
> 

I do have the tools installed and from what I can see the clock isn't so far 
off. At least when I run the two tests side by side the vm run always finishes 
first. Of course that could be because vmware is stealing cpu somehow.

> See these notes:
> 
> http://kb.vmware.com/selfservice/viewContent.do?language=en_US&externalId=1420
> http://communities.vmware.com/message/782173
> 


-- 
Robin Becker



From digitig at gmail.com  Thu Feb  5 05:10:31 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 10:10:31 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
Message-ID: <aee48b3c0902050210v42eef9abr84fcf62ddcdbe6fa@mail.gmail.com>

2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:
> Mark Dickinson <dickinsm at gmail.com> wrote:
>
>> def count_set_bits(n):
>>     # make sure we include an if, to
>>     # satisfy OP's requirements:
>>     if n < 0:
>>         raise ValueError
>>     count = 0
>>     while n:
>>         count += 1
>>         n &= n-1
>>     return count
>>
>> is_even = count_set_bits(the_int) % 2 == 0
>>
>> ...but anyone submitting this as a homework
>> solution had better be prepared to explain why
>> it works.
>>
>
> I remember a programming exercise when I was an undergraduate and anyone
> who *didn't* use that trick got marked down for writing inefficient code.

Is adding and a modulus *really^ more efficient than flipping a bool
as I suggested? I think I'd want to see measurements!


-- 
Tim Rowe


From robin at reportlab.com  Thu Feb  5 05:12:15 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 05 Feb 2009 10:12:15 +0000
Subject: x64 speed
In-Reply-To: <4989ee71$0$3356$9b622d9e@news.freenet.de>
References: <mailman.8707.1233682582.3487.python-list@python.org>
	<4989ee71$0$3356$9b622d9e@news.freenet.de>
Message-ID: <498ABB7F.6060006@chamonix.reportlab.co.uk>

Martin v. L?wis wrote:
>> Is it the
>> x64 working faster at its design sizes
> 
> Another guess (still from the darkness of not having received the
> slightest clue what the test actually does): if it creates integers
> in range(2**32, 2**64), then they fit into a Python int on AMD64-Linux,
> but require a Python long on 32-bit Windows; long operations are much
> slower than int operations.
> 
......
I don't think we're doing a lot of bignum arithmetic, some masking operations 
etc etc.

-- 
Robin Becker



From tino at wildenhain.de  Thu Feb  5 05:21:44 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Thu, 05 Feb 2009 11:21:44 +0100
Subject: Comparing two book chapters (text files)
In-Reply-To: <72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>
References: <mailman.8818.1233796861.3487.python-list@python.org>
	<72733721-53a4-4801-ad66-01cce5880d81@t11g2000yqg.googlegroups.com>
Message-ID: <498ABDB8.1000001@wildenhain.de>

andrew cooke wrote:
> On Feb 4, 10:20 pm, Nick Matzke <mat... at berkeley.edu> wrote:
>> So I have an interesting challenge.  I want to compare two book
>> chapters, which I have in plain text format, and find out (a) percentage
>> similarity and (b) what has changed.
> 
> no idea if it will help, but i found this yesterday - http://www.nltk.org/
> 
> it's a python toolkit for natural language processing.  there's a book
> at http://www.nltk.org/book with much more info.

Also there is difflib in the standard package which can be used
depending on exact definition of "similarity".

Regards
Tino
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From steve at holdenweb.com  Thu Feb  5 05:22:35 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 05:22:35 -0500
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <gmeeld$25d$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
[a somewhat feeble case for ordered dicts]
> Once the default dicts are ordered, it can be possible to add an
> unordereddict to the collections module to be used by programmers when
> max performance or low memory usage is very important :-)
> 
I have no real idea why you think it's desirable to turn this important
feature on its head, but if you've followed the various past threads on
ordered dicts you would know that one of the prime issues every time
this comes up is the inability of the various proponents to agree no ow
dicts should actually be ordered.

> Namespaces and other internal things of Python can keep using the un-
> ordereddicts.
> 
> I don't know what to do regarding Python sets yet. In mathematics sets
> aren't ordered, so they may be kept as they are now.
> 
In mathematics mappings aren't ordered either, and a pure dict is pretty
much a mapping. So leave them alone, they are fine as they are!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From http  Thu Feb  5 05:25:03 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 02:25:03 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <7x7i45qiyo.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> Now Ruby dicts are ordered by default:
> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/

Maybe I didn't read that carefully enough, but it looks like "ordered"
means the dict records come out in the same order you inserted them
in.  That is if you insert B,A,D,C in that order, you get them out in
that order.  I would have thought an ordered dict meant you get A,B,C,D,
which seems a lot more useful.

Red-black trees as described at the bottom of the page are a good way
to get A,B,C,D.  They also make it simple to have "persistent" or
"functional" dictionaries, which I've written about a few times before.


From http  Thu Feb  5 05:28:04 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 02:28:04 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<mailman.8855.1233829373.3487.python-list@python.org>
Message-ID: <7x3aetqitn.fsf@ruckus.brouhaha.com>

Steve Holden <steve at holdenweb.com> writes:
> In mathematics mappings aren't ordered either, and a pure dict is pretty
> much a mapping. So leave them alone, they are fine as they are!

Ehhh, an ordered dict has to support a comparison operation on the
keys, while a Python dict has to support a hashing operation on them.
Neither really captures the idea of a pure mapping, which shouldn't
have to support any operations (even equality) on the keys.

There have been several times when I've wished for persistent ordered
dicts in Python.  I started writing a big post about it a while ago
and maybe I'll finish it someday.


From duncan.booth at invalid.invalid  Thu Feb  5 05:47:52 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 10:47:52 GMT
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
	<mailman.8852.1233828636.3487.python-list@python.org>
Message-ID: <Xns9BA96DBE047Cduncanbooth@127.0.0.1>

Tim Rowe <digitig at gmail.com> wrote:

> 2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:
>> Mark Dickinson <dickinsm at gmail.com> wrote:
>>
>>> def count_set_bits(n):
>>>     # make sure we include an if, to
>>>     # satisfy OP's requirements:
>>>     if n < 0:
>>>         raise ValueError
>>>     count = 0
>>>     while n:
>>>         count += 1
>>>         n &= n-1
>>>     return count
>>>
>>> is_even = count_set_bits(the_int) % 2 == 0
>>>
>>> ...but anyone submitting this as a homework
>>> solution had better be prepared to explain why
>>> it works.
>>>
>>
>> I remember a programming exercise when I was an undergraduate and
>> anyone who *didn't* use that trick got marked down for writing
>> inefficient code. 
> 
> Is adding and a modulus *really^ more efficient than flipping a bool
> as I suggested? I think I'd want to see measurements!
> 
> 
I meant the bitwise twiddling, but actually I misread it. I thought Mark 
was using the n&~n+1 trick to pull out bits from least significant upwards 
when of course he's just clearing the low bit not extracting it.


-- 
Duncan Booth http://kupuguy.blogspot.com


From simon at mullis.co.uk  Thu Feb  5 05:50:05 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 11:50:05 +0100
Subject: parse date/time from a log entry with only strftime (and no 
	regexen)
In-Reply-To: <7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>
References: <23d7e1bb0902030552j6a12dcbcy428c9ede8419fb7b@mail.gmail.com>
	<mailman.8702.1233679732.3487.python-list@python.org>
	<7e3602b0-57c0-4d9e-8c8d-fb0a5b00108d@d36g2000prf.googlegroups.com>
Message-ID: <23d7e1bb0902050250k60cceb46jf7c1149f0b1e024@mail.gmail.com>

That, my friend, is ingenious...!

Thankyou

SM

2009/2/3 andrew cooke <andrew at acooke.org>

> > > ValueError: unconverted data remains:  this is the remainder of the log
>
> > > line
> > > that I do not care about
>
> you could catch the ValueError and split at the ':' in the .args
> attribute to find the extra data.  you could then find the extra data
> in the original string, use the index to remove it, and re-parse the
> time.
>
> ugly, but should work.
> andrew
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Simon Mullis
_________________
simon at mullis.co.uk
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From simon at mullis.co.uk  Thu Feb  5 05:58:48 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 11:58:48 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
Message-ID: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>

Hi All

I've written a simple python script that accepts both stdin and a glob (or
at least, that is the plan).
Unfortunately, the glob part seems to hang when it's looped through to the
end of the filehandle.

And I have no idea why... ;-)

sys.stdin and a normal file opened with "open" seem to both be identical
filehandles.

>>> import sys
>>> foo = sys.stdin
>>> type(foo)
<type 'file'>
>>> repr(foo)
"<open file '<stdin>', mode 'r' at 0x16020>"

>>> bar = open("test_file", 'r')
>>> type(bar)
<type 'file'>
>>> repr(bar)
"<open file 'test_file', mode 'r' at 0x3936e0>"

The stdin version is fine. I want to re-use the code for scan_data (and all
of the other processing methods) so I'd like to be able to iterate over one
line at a time, independently of the source (i.e. either file or stdin)

Code that illustrates the issue follows:

# cat test_fh.py

#!/usr/bin/env python
import glob, os, sys
class TestParse(object):
    def __init__(self):
        if (options.stdin):
              self.scan_data(sys.stdin)
        if (options.glob):
              self.files = glob.glob(options.glob)
                      for f in files:
                              fh = open(f, 'r')
                              self.scan_data(fh)
                              fh.close()

    def scan_data(self,fileobject):
                i = int()
        for line in fileobject:
                        print i
                        i += 1
                        # do stuff with the line...
                        pass
               print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
        p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob")
        p.add_option("--stdin", dest="stdin", action="store_true",
default="False")
        (options, args) = p.parse_args()
        main()

#EOF

Running this against stdin outputs a count of lines and then exits fine
(exit code 0).

# cat test_file | ./test-fh.py --stdin
...output...
# echo $?
0

Running against --glob "test_file" just hangs.....

# ./test_fh.py --glob "test_file"
....wait 20 seconds or so...
^CTraceback (most recent call last):
  File "./test_fh.py", line 35, in <module>
    main()
  File "./test_fh.py", line 26, in main
    T = TestParse()
  File "./test_fh.py", line 8, in __init__
    self.scan_data(sys.stdin)
  File "./test_fh.py", line 18, in scan_data
    for line in fileobject:
KeyboardInterrupt
 # echo $?
1

So, what am I doing wrong?

Thanks in advance

SM

-- 
Simon Mullis
_________________
simon at mullis.co.uk
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From duncan.booth at invalid.invalid  Thu Feb  5 06:08:09 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 11:08:09 GMT
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <Xns9BA9703C478C6duncanbooth@127.0.0.1>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.
> 
If you want to write doctests then any stable order in the default dict 
type would be helpful no matter whether it means that keys are in original 
insertion or latest insertion order or sorted.

There are other use cases where maintaining insertion order is important. 
For example any automated code generator which parses its previous output 
and then regenerates it maintaining edits. I ran into that before with one 
which just stored the methods in a Python dict so that every so often you'd 
find the entire source file had rearranged itself making a mess of version 
control.

It would certainly be an interesting experiment to mimic the Ruby dict 
implementation in Python's dict code and see what effect it has on 
performance: the Ruby page claims that while inserts are slower traversal 
is much faster. I think it would need some pretty convincing arguments 
though to become the default.

-- 
Duncan Booth http://kupuguy.blogspot.com


From clp2 at rebertia.com  Thu Feb  5 06:12:18 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 03:12:18 -0800
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
Message-ID: <50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>

On Thu, Feb 5, 2009 at 2:58 AM, Simon Mullis <simon at mullis.co.uk> wrote:
> Hi All
>
> I've written a simple python script that accepts both stdin and a glob (or
> at least, that is the plan).
> Unfortunately, the glob part seems to hang when it's looped through to the
> end of the filehandle.
>
> And I have no idea why... ;-)
>
> sys.stdin and a normal file opened with "open" seem to both be identical
> filehandles.
>
>>>> import sys
>>>> foo = sys.stdin
>>>> type(foo)
> <type 'file'>
>>>> repr(foo)
> "<open file '<stdin>', mode 'r' at 0x16020>"
>
>>>> bar = open("test_file", 'r')
>>>> type(bar)
> <type 'file'>
>>>> repr(bar)
> "<open file 'test_file', mode 'r' at 0x3936e0>"
>
> The stdin version is fine. I want to re-use the code for scan_data (and all
> of the other processing methods) so I'd like to be able to iterate over one
> line at a time, independently of the source (i.e. either file or stdin)
>
> Code that illustrates the issue follows:
>
> # cat test_fh.py
>
> #!/usr/bin/env python
> import glob, os, sys
> class TestParse(object):
>     def __init__(self):
>         if (options.stdin):
>               self.scan_data(sys.stdin)
>         if (options.glob):
>               self.files = glob.glob(options.glob)
>                       for f in files:
>                               fh = open(f, 'r')
>                               self.scan_data(fh)
>                               fh.close()
>
>     def scan_data(self,fileobject):
>                 i = int()
>         for line in fileobject:
>                         print i
>                         i += 1
>                         # do stuff with the line...
>                         pass
>                print "finished file"

I'd add some print()s in the above loop (and also the 'for f in files'
loop) to make sure the part of the code you didn't want to share ("do
stuff with the line") works correctly, and that nothing is improperly
looping in some unexpected way.

Also, there are several series of lines with invalid indentation;
could be an email artifact or could be the cause of your problem. If
the print()s don't yield any useful insight, repost the code again
with absolutely correct indentation.

Finally, some stylistic points:
- don't do 'if (foo):'   use the less noisy 'if foo:' instead
- don't do 'i = int()'   use the more obvious 'i = 0' instead

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 06:15:22 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 12:15:22 +0100
Subject: Understanding descriptors
In-Reply-To: <mailman.8322.1233272628.3487.python-list@python.org>
References: <mailman.8322.1233272628.3487.python-list@python.org>
Message-ID: <498aca36$0$24804$426a74cc@news.free.fr>

Brian Allen Vanderburg II a ?crit :
> I'm trying to better understand descriptors and I've got a few questions 
> still after reading some sites.  Here is what I 'think', but please let 
> me know if any of this is wrong as I'm sure it probably is.
> 
> 
> First when accessing an attribute on a class or instance it must be 
> found.  For an instance, it's __dict__ is first search.

Actually, this is not true - binding descriptors are searched (in the 
class and it's mro) _before_ the instance's __dict__ :

 >>> class Foo(object):
...     @apply
...     def bar():
...         def fget(self):
...             return self._bar
...         def fset(self, v):
...             self._bar = v
...         return property(**locals())
...
 >>> f = Foo()
 >>> f.bar = 42
 >>> f.bar
42
 >>> f.__dict__['bar'] = "boo"
 >>> f.bar
42
 >>> f.__dict__['bar']
'boo'
 >>>

Note that this works a bit differently for non-binding descriptors 
(descriptors that only implement the __get__ method), which are looked 
up after the instance's __dict__

So the lookup chain is:

1/ lookup the class and bases for a binding descriptor
2/ then lookup the instance's __dict__
3/ then lookup the class and bases for a non-binding descriptor or plain 
attribute
4/ then class __getattr__

Also and FWIW, there's a "step zero" : calls __getattribute__. All the 
above lookup mechanism is actually implemented by object.__getattribute__.

>  If not found 
> the class and base class __dict__ are searched.  For a class, the 
> __dict__ and base classes __dict__ are search.
> 
> If assigning, and the attribute is found and is not a descriptor

a binding descriptor

> or if 
> the attribute is not found, then the assignment will occur in the 
> __dict__ of the class or instance.  If it is found and is a descriptor, 

a binding descriptor

> then __set__ will be call.


> For reading, if the attribute is found and is a descriptor, __get__ will 
> be called, passing the object (if it is an instance) and class.  If it 
> is not a descriptor, the attribute will be returned directly.
> 
> Class methods are just functions:

In Python, "classmethod" has a definite meaning - it's a method that 
takes the class (and not the instance) as first argument. So your 
assertion should be "Methods are just functions which are attributes of 
the class". Which is still not quite true. Sure, the def statement 
always create function objects, regardless of whether it happens within 
a class statement or not. OTHO, what you get when looking up the 
corresponding attribute is definitly a method object. So the correct 
formulation here is (IMHO of course) that methods are implemented by 
functions that are attributes of the class. Also, this is not restricted 
to functions : any callable object correctly implementing the descriptor 
protocol can be used (cf the classmethod and staticmethod objects).

> class C(object):
>    def F(self):
>       pass
> 
> C.__dict__['F'] # function object ...

yes.

> But functions are descriptors:

yes.

> C.__dict__['F'].__get__ # method wrapper ...
> 
> def f1():
>    pass
> 
> f1.__get__ # method wrapper ...
> 
> When a lookup is done it uses this descriptor to make a bound or unbound 
> method:

yes.

> c=C()
> 
> C.F # unbound method object, expects explicit instance when calling the 
> function
> c.F # bound method object provides instance implicitly when calling the 
> function
> 
> This is also done when adding to the classes:

Indeed. Whether the def statement happens within the class statement or 
not is irrelevant here.

> C.f1 = f1
> 
> f1 # function
> C.f1 # unbound method
> c.f1 # bound method
> 
> To prevent this it has to be decorated so the descriptor doesn't cause 
> the binding:
> 
> C.f2 = staticmethod(f1)
> C.f2 # functon
> c.f2 # function

yes.

> Here is a question, why don't instance attributes do the same thing?

Because the descriptor protocol is only invoked on class attributes.

> c.f3 = f1
> c.f3 # function, not bound method
> 
> So it is not calling the __get__ method for c.f3  After it finds c.f3 in 
> c.__dict__, and since it has a getter, shouldn't it call the __get__ to 
> return the bound method.

Nope, cf above.

>  It is good that it doesn't I know, but I just 
> want to know why it doesn't from an implementation view.

If by "from an implementation view", you mean "how it works", then the 
answer is above. If your question was about "why this design choice", 
I'll leave the answer to someone else...


From thomasvangurp at gmail.com  Thu Feb  5 06:16:46 2009
From: thomasvangurp at gmail.com (thomasvangurp at gmail.com)
Date: Thu, 5 Feb 2009 03:16:46 -0800 (PST)
Subject: Python 3.0 slow file IO
Message-ID: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>

I just recently learned python, I'm using it mainly to process huge
<5GB txt files of ASCII information about DNA. I've decided to learn
3.0, but maybe I need to step back to 2.6?

I'm getting exceedingly frustrated by the slow file IO behaviour of
python 3.0. I know that a bug-report was submitted here:
http://bugs.python.org/issue4533. And a solution was posted.
However, i don't know how to apply this patch. I've searched the
forums and tried:
C:\python30> patch -p0 < fileio_buffer.patch
The patch command is not recognized..

Any help on implementing this patch, or advice on moving back to the
older version is appreciated.
Kind regards,
Thomas


From http  Thu Feb  5 06:25:52 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 03:25:52 -0800
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<Xns9BA9703C478C6duncanbooth@127.0.0.1>
Message-ID: <7xmyd1rupr.fsf@ruckus.brouhaha.com>

Duncan Booth <duncan.booth at invalid.invalid> writes:
> If you want to write doctests then any stable order in the default dict 
> type would be helpful no matter whether it means that keys are in original 
> insertion or latest insertion order or sorted.

Just use "sorted" in the test code:
  >>> print sorted(dict((a**2,a) for a in xrange(5)).keys())
  [0, 1, 4, 9, 16]

> There are other use cases where maintaining insertion order is
> important.  For example any automated code generator which parses
> its previous output and then regenerates it maintaining edits. I ran
> into that before with one which just stored the methods in a Python
> dict so that every so often you'd find the entire source file had
> rearranged itself making a mess of version control.

Still doesn't sound so bad: just include a counter with the value.
Something like (untested):

   odict = dict(zip(methodnames, zip(methodbodies, itertools.count())))
   ...
   gen_code(sorted(odict.iteritems(), key=lambda(name,(body,n)): n))

> It would certainly be an interesting experiment to mimic the Ruby dict 
> implementation in Python's dict code and see what effect it has on 
> performance: the Ruby page claims that while inserts are slower traversal 
> is much faster. I think it would need some pretty convincing arguments 
> though to become the default.

In my usage of dicts, traversal is rather rare, but YMMV.


From eckhardt at satorlaser.com  Thu Feb  5 06:33:44 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Thu, 05 Feb 2009 12:33:44 +0100
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
Message-ID: <qdvq56-9ff.ln1@satorlaser.homedns.org>

thomasvangurp at gmail.com wrote:
> C:\python30> patch -p0 < fileio_buffer.patch
> The patch command is not recognized..

You need the 'patch' program first. Further, you will need a C compiler. If
you don't know how to compile from sources, I would postpone patching
sources to after learning that.

> [...] advice on moving back to the older version is appreciated.

Just install the latest 2.6 release. I think you can easily install it
alongside 3.0, all you need to pay attention to is the "PATH" environment
variable.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From lists at cheimes.de  Thu Feb  5 06:40:18 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 12:40:18 +0100
Subject: Python 3.0 slow file IO
In-Reply-To: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
Message-ID: <gmej72$heu$1@ger.gmane.org>

thomasvangurp at gmail.com schrieb:
> I just recently learned python, I'm using it mainly to process huge
> <5GB txt files of ASCII information about DNA. I've decided to learn
> 3.0, but maybe I need to step back to 2.6?
> 
> I'm getting exceedingly frustrated by the slow file IO behaviour of
> python 3.0. I know that a bug-report was submitted here:
> http://bugs.python.org/issue4533. And a solution was posted.
> However, i don't know how to apply this patch. I've searched the
> forums and tried:
> C:\python30> patch -p0 < fileio_buffer.patch
> The patch command is not recognized..

You need the Python sources, a patch utility and Microsoft Visual Studio
2008 in order to compile Python yourself.
> 
> Any help on implementing this patch, or advice on moving back to the
> older version is appreciated.

I suggest you stick with Python 2.5 or 2.6. Python 3.0 isn't as mature
as the 2.x series. It's brand new, lot's of things have changed, too.



From s.selvamsiva at gmail.com  Thu Feb  5 06:40:35 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Thu, 5 Feb 2009 17:10:35 +0530
Subject: string replace for back slash
Message-ID: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>

Hi all,

I tried to do a string replace as follows,

>>> s="hi & people"
>>> s.replace("&","\&")
'hi \\& people'
>>>

but i was expecting 'hi \& people'.I dont know ,what is something different
here with escape sequence.

-- 
Yours,
S.Selvam
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From digitig at gmail.com  Thu Feb  5 06:45:25 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 11:45:25 +0000
Subject: Using while loop and if statement to tell if a binary has an odd 
	or even number of 1's.
In-Reply-To: <Xns9BA96DBE047Cduncanbooth@127.0.0.1>
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
	<mailman.8852.1233828636.3487.python-list@python.org>
	<Xns9BA96DBE047Cduncanbooth@127.0.0.1>
Message-ID: <aee48b3c0902050345w65912ed2s95f171f0755b798a@mail.gmail.com>

2009/2/5 Duncan Booth <duncan.booth at invalid.invalid>:

>>> I remember a programming exercise when I was an undergraduate and
>>> anyone who *didn't* use that trick got marked down for writing
>>> inefficient code.
>>
>> Is adding and a modulus *really^ more efficient than flipping a bool
>> as I suggested? I think I'd want to see measurements!
>>
>>
> I meant the bitwise twiddling, but actually I misread it. I thought Mark
> was using the n&~n+1 trick to pull out bits from least significant upwards
> when of course he's just clearing the low bit not extracting it.

Ah, ok. Yes, that's faster than my bit shifting. A million bytes with
your method on my computer with your bit-twiddling takes 1.047
seconds, with my bit-shifting it takes 1.578. On the other hand,
unless that was demonstrated to be a bottleneck I'd still go for the
bit shifting because I think it's clearer. And I'd want a word with a
tutor who insisted on premature optimisation ("The root of all evil",
according to C A R Hoare), especially in a scripting language!

-- 
Tim Rowe


From mal at egenix.com  Thu Feb  5 06:47:03 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 12:47:03 +0100
Subject: JDBC in CPYTHON
In-Reply-To: <63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>
References: <3e9865ac-ce12-492f-83db-74bd78ed3ee2@i18g2000prf.googlegroups.com>	<mailman.8802.1233782196.3487.python-list@python.org>
	<63dfd3f1-ce70-4b40-b375-82c0ee03d1c3@u14g2000yqg.googlegroups.com>
Message-ID: <498AD1B7.5010803@egenix.com>

On 2009-02-05 03:49, KMCB wrote:
> Thanks Simon and Marc,
> 
> I currently have an app on OSX that I wanted to migrate to NIX, it
> uses a ODBC DBAPI interface to communicate with Filemaker.
> Unfortunately, FMP does not support linux drivers.  They do have a
> JDBC driver that looks like it may work.  My preference was to run
> that app on one machine.
> 
> I may not be understand your suggestion Marc, can the app and bridge
> run on the same machine.  Can I specify the ODBC to a localhost, being
> the bridge?  Then have the JDBC driver installed.

The setup would work as follows:

Python -> mxODBC -> ODBC-JDBC bridge -> JDBC driver -> Filemaker

[--- Linux ----------------------------------------]   [Mac OS X]

I am not sure how you'd have to configure the EasySoft bridge.
Please check their documentation for details.

We are currently working on releasing mxODBC Connect, our client server
Python database interface, for Mac OS X. You will then be able
to use a much simpler and more efficient setup:

Python -> mxODBC Connect Client ->
[--- Linux --------------------]

mxODBC Connect Server -> ODBC driver -> Filemaker
[--- Mac OS X -----------------------------------]

and because the mxODBC Connect Cient is highly portable, moving
your application to other platforms would be easily possible
as well.

Plus, you'd avoid having to carry around the whole JVM in your
Python application: the ODBC-JDBC bridge essentially embeds
the JVM in your application and then uses JNI to interface
from C to Java and from there to the JDBC driver.

> Also, your second link does not seam to have a download or anything in
> the CVS.

Sorry, I should have looked closer... the SF project page reveals
that the "PROJECT IS DEAD!":

   http://sourceforge.net/projects/odbcjdbc/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From clp2 at rebertia.com  Thu Feb  5 06:59:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 03:59:16 -0800
Subject: string replace for back slash
In-Reply-To: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
Message-ID: <50697b2c0902050359y57812425pb31dbb561672b0a0@mail.gmail.com>

On Thu, Feb 5, 2009 at 3:40 AM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
>
> I tried to do a string replace as follows,
>
>>>> s="hi & people"
>>>> s.replace("&","\&")
> 'hi \\& people'
>>>>
>
> but i was expecting 'hi \& people'.I dont know ,what is something different
> here with escape sequence.

The Python interactive interpreter does an implicit repr() (consult
the docs if you're unfamiliar with the repr() function) on the return
value of the expression. Note the single quotes in the output, which
obviously wouldn't be present in the string itself; same thing with
the doubling of the backslash.
If you instead do `print s.replace("&","\&")`, you'll see that the
outputted string does indeed only contain 1 backslash.

It's a common newbie confuser, there really should be a FAQ about it;
pity there isn't.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mal at egenix.com  Thu Feb  5 07:00:30 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 13:00:30 +0100
Subject: Comparing two book chapters (text files)
In-Reply-To: <498A3EC6.4040607@berkeley.edu>
References: <498A3EC6.4040607@berkeley.edu>
Message-ID: <498AD4DE.4080703@egenix.com>

On 2009-02-05 02:20, Nick Matzke wrote:
> Hi all,
> 
> So I have an interesting challenge.  I want to compare two book
> chapters, which I have in plain text format, and find out (a) percentage
> similarity and (b) what has changed.
> 
> Some features make this problem different than what seems to be the
> standard text-matching problem solvable with e.g. difflib.  Here is what
> I mean:
> 
> * there is no guarantee that single lines from each file will be
> directly comparable -- e.g., if a few words are inserted into a
> sentence, then a chunk of the sentence will be moved to the next line,
> then a chunk of that line moved to the next, etc.
> 
> * Also, there are cases where paragraphs have been moved around,
> sections re-ordered, etc.  So it can't just be a "linear" match.
> 
> I imagine this kind of thing can't be all that hard in the grand scheme
> of things, but I couldn't find an easily applicable solution readily
> available.  I have advanced beginner python skills but am not quite
> where I could do this kind of thing from scratch without some guidance
> about the likely functions, libraries etc. to use.
> 
> PS: I am going to have to do this for multiple book chapters so various
> software packages, e.g. for windows, are not really usable.
> 
> Any help is much appreciated!!

difflib is in the Python stdlib and provides many ways to implement
difference detection:

    http://docs.python.org/library/difflib.html

Here's a script that I use for diff'ing text files on a word
basis, called tdiff.py:

    http://downloads.egenix.com/python/tdiff.py

It helps a lot with text that gets word wrapped or reformatted.

Cheers,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mal at egenix.com  Thu Feb  5 07:01:33 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 05 Feb 2009 13:01:33 +0100
Subject: global name 'sqrt' is not defined
In-Reply-To: <498AAC89.5080002@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
Message-ID: <498AD51D.5000609@egenix.com>

On 2009-02-05 10:08, Nick Matzke wrote:
> Hi all,
> 
> So, I can run this in the ipython shell just fine:
> 
> ===========
> a = ["12", "15", "16", "38.2"]
> dim = int(sqrt(size(a)))
> 
> dim
>>2
> ===========
> 
> 
> But if I move these commands to a function in another file, it freaks out:

You need to add:

from math import sqrt

> =================================
> a = distances_matrix.split('\t')
> from LR_run_functions_v2 import make_half_square_array
> d = make_half_square_array(a)
> 
>>
> ---------------------------------------------------------------------------
> NameError                                 Traceback (most recent call last)
> 
> /bioinformatics/phylocom/<ipython console> in <module>()
> 
> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in
> make_half_square_array(linear_version_of_square_array)
>    1548
>    1549         a = linear_version_of_square_array
> -> 1550         dim = int(sqrt(size(a)))
>    1551
>    1552
> 
> NameError: global name 'sqrt' is not defined
> 
> =================================
> 
> 
> 
> 
> Here's the function in LR_run_functions_v2.py
> 
> ==========================
> def make_half_square_array(linear_version_of_square_array):
> 
>     a = linear_version_of_square_array
>     dim = int(sqrt(size(a)))
> ==========================
> 
> 
> 
> Any ideas?  If I do something like "import math" in the subfunction,
> then the error changes to "global name 'math' is not defined".
> 
> Thanks!
> Nick
> 
> 
> 
> 
> 
> 
> 

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 05 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From BrianVanderburg2 at aim.com  Thu Feb  5 07:04:40 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 07:04:40 -0500
Subject: Understanding descriptors
In-Reply-To: <498aca36$0$24804$426a74cc@news.free.fr>
References: <mailman.8322.1233272628.3487.python-list@python.org>
	<498aca36$0$24804$426a74cc@news.free.fr>
Message-ID: <498AD5D8.50501@aim.com>

bruno.42.desthuilliers at websiteburo.invalid wrote:
>
> So the lookup chain is:
>
> 1/ lookup the class and bases for a binding descriptor
> 2/ then lookup the instance's __dict__
> 3/ then lookup the class and bases for a non-binding descriptor or 
> plain attribute
> 4/ then class __getattr__
>
> Also and FWIW, there's a "step zero" : calls __getattribute__. All the 
> above lookup mechanism is actually implemented by 
> object.__getattribute__.

Okay, so instance attributes never use their __get__/__set__/etc when 
looking up.

A binding descriptor is one that has a __set__ (even if it doesn't do 
anything) and it takes priority over instance variables.  Properties are 
binding descriptors even if they don't have a set function specified.  A 
non-binding descriptor doesn't have __set__ and instance variables take 
priority over them. 

For reading:

1. Lookup in the class/bases for a binding descriptor and if found use 
its __get__
2. If instance, look up in instance __dict__ and if found return it
3. Lookup in the class/bases
    a. if found and a descriptor use it's __get__
    b. if found and not a descriptor return it
4. Use __getattr__ (if instance?)

For writing:

1. If instance
    a. lookup in the class/bases for a binding descriptor and if found 
use its __set__
    b. write to instance __dict__
2. If class, write in class __dict__


I think I understand it now.  Thanks.

Brian Vanderburg II


From duncan.booth at invalid.invalid  Thu Feb  5 07:19:09 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Feb 2009 12:19:09 GMT
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<Xns9BA9703C478C6duncanbooth@127.0.0.1>
	<7xmyd1rupr.fsf@ruckus.brouhaha.com>
Message-ID: <Xns9BA97C4636638duncanbooth@127.0.0.1>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

> Duncan Booth <duncan.booth at invalid.invalid> writes:
>> If you want to write doctests then any stable order in the default
>> dict type would be helpful no matter whether it means that keys are
>> in original insertion or latest insertion order or sorted.
> 
> Just use "sorted" in the test code:
>  >>> print sorted(dict((a**2,a) for a in xrange(5)).keys())
>   [0, 1, 4, 9, 16]
> 

No, that only works if you have control over the dict iteration. There are 
plenty of situations when tests become unstable because dicts are unstable 
and you don't have control over the order of iteration. Also, if you are 
using doctests as a form of documentation then you just want to be able to 
show the value, or at most pprint it, you don't want to obscure the 
documentation with calls to sort.

For example if you have something that creates xml then almost certainly 
the library you are using stores the attributes for a tag in a dictionary 
and just outputs them in whatever order they iterate over. That's fine for 
creating XML but when you want a test like:

>>> mydata.asXml()
<... some xml here except we don't know what order the attributes will 
appear in ...>

then you are stuffed. Actually it's also a problem if you want to store the 
output XML in Subversion. As with my round-trip coding problem you could 
obviously solve it by changing the code to sort the output, but stabilising 
the order of dict iteration would solve the problem for all such cases.

-- 
Duncan Booth http://kupuguy.blogspot.com


From rdmurray at bitdance.com  Thu Feb  5 07:29:46 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 12:29:46 +0000 (UTC)
Subject: string replace for back slash
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
Message-ID: <gmem3q$p8f$1@ger.gmane.org>

"S.Selvam Siva" <s.selvamsiva at gmail.com> wrote:
> I tried to do a string replace as follows,
> 
> >>> s="hi & people"
> >>> s.replace("&","\&")
> 'hi \\& people'
> >>>
> 
> but i was expecting 'hi \& people'.I dont know ,what is something different
> here with escape sequence.

You are running into the difference between the 'repr' of a string (which
is what is printed by default at the python prompt) and the actual
contents of the string.  In the repr the backslash needs to be escaped
by prefixing it with a backslash, just as you would if you wanted to
enter a backslash into a string in your program.  If you print the string,
you'll see there is only one backslash.  Note that you didn't need to
double the backslash in your replacement string only because it wasn't
followed by a character that forms an escape...but the repr of that
string will still have the backslash doubled, and that is really the
way you should write it in your program to begin with for safety's sake.

Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s="hi & people"
>>> replacementstring = "\&"
>>> replacementstring
'\\&'
>>> print replacementstring
\&
>>> x = s.replace("&","\\&")
>>> x
'hi \\& people'
>>> print x
hi \& people



From simon at mullis.co.uk  Thu Feb  5 07:37:54 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 13:37:54 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
Message-ID: <23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>

Hi Chris

2009/2/5 Chris Rebert <clp2 at rebertia.com>
>
> I'd add some print()s in the above loop (and also the 'for f in files'
> loop) to make sure the part of the code you didn't want to share ("do
> stuff with the line") works correctly, and that nothing is improperly
> looping in some unexpected way.

The point is that even with the very, very simple script I posted
above the behavior of open(sys.stdin) and open(filename, 'r') is
different.

The object foo (where foo = sys.stdin) allows me to iterate then hands
back after the loop is finished.

The object bar (where bar = open(filename, 'r')) does not.

Both foo and bar have the same type, methods, repr etc.

> Also, there are several series of lines with invalid indentation;
> could be an email artifact or could be the cause of your problem. If
> the print()s don't yield any useful insight, repost the code again
> with absolutely correct indentation.

(code posted again to fix indents)
#!/usr/bin/env python

import glob, os, sys

class TestParse(object):
    def __init__(self):
        if options.stdin:
            self.scan_data(sys.stdin)
            if options.glob:
                self.files = glob.glob(options.glob)
                for f in files:
                    fh = open(f, 'r')
                    self.scan_data(fh)
                    fh.close()

    def scan_data(self,fileobject):
        i = 0
        for line in fileobject:
            print i
            i += 1
            # do stuff with the line...
            pass
        print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
    p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob")
    p.add_option("--stdin", dest="stdin", action="store_true", default="False")
    (options, args) = p.parse_args()
    main()


(The code I'm actually using is much more complex than this. I tried
to create the most simple example of it _not_ working as expected...)

> Finally, some stylistic points:
> - don't do 'if (foo):'   use the less noisy 'if foo:' instead
> - don't do 'i = int()'   use the more obvious 'i = 0' instead
>
ok.

My question again, to be more explicit: Should the objects created by
sys.stdin and open(filename, 'r') have the same behavior when iterated
over? They both have __iter__ methods....

Thanks in advance for any suggestions

SM


From rdmurray at bitdance.com  Thu Feb  5 07:39:09 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 12:39:09 +0000 (UTC)
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
	<gmej72$heu$1@ger.gmane.org>
Message-ID: <gmemlc$r4s$1@ger.gmane.org>

Quoth Christian Heimes <lists at cheimes.de>:
> thomasvangurp at gmail.com schrieb:
> > I just recently learned python, I'm using it mainly to process huge
> > <5GB txt files of ASCII information about DNA. I've decided to learn
> > 3.0, but maybe I need to step back to 2.6?
> > 
> > I'm getting exceedingly frustrated by the slow file IO behaviour of
> > python 3.0. I know that a bug-report was submitted here:
> > http://bugs.python.org/issue4533. And a solution was posted.
[snip stuff about patching]
> 
> I suggest you stick with Python 2.5 or 2.6. Python 3.0 isn't as mature
> as the 2.x series. It's brand new, lot's of things have changed, too.

3.1 will come out much sooner than a normal "next dot" release python
would, and will contain very significant improvements in the IO speed.
In the meantime, in your case at least, to get real work done you'll
be better off using 2.6.  You can use the 'from __future__ import' to
bring various 3.0 features into 2.6 and make 2.6 look more like 3.0,
and you can use the -3 flag to check your code for 3.0 compatibility, so
that you will be ready to move back to the 3 series when 3.1 comes out.
(Assuming you don't end up needing any 3rd party libraries that haven't
been ported yet by then, that is.)

Unless, of course, you are comfortable with compiling from source
and would like to help _test_ the 3.1 IO library.... :)

--RDM



From andrew at acooke.org  Thu Feb  5 07:50:39 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 5 Feb 2009 04:50:39 -0800 (PST)
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>


so what is happening with pep 372?

http://www.python.org/dev/peps/pep-0372/


From mrkafk at gmail.com  Thu Feb  5 07:54:15 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 13:54:15 +0100
Subject: Arguments for map'ped functions
Message-ID: <gmenhm$vhk$1@ger.gmane.org>

Hello everyone,

So I have this function I want to map onto a list of sequences of 
*several* arguments (while I would want to pass those arguments to each 
function in the normal fashion). I realize this is contrived, maybe an 
example would make this clear:

params = [ ('comp.lang.python', ['rtfm', 'shut']), ('comp.lang.perl', 
['rtfm','shut']) ]

qurls = map(consqurls, params)

def consqurls(args):
     ggroup, gkeywords = args
...

Since the argument passed to map'ped function is a single tuple of 
arguments, I have to unpack them in the function. So the question is how 
to pass several arguments to a map'ped function here?


Code in question:

def fillurlfmt(args):
     urlfmt, ggroup, gkw = args
     return {'group':ggroup, 'keyword':gkw, 'url': urlfmt % (gkw, ggroup)}

def consqurls(args):
     ggroup, gkeywords = args
     urlfmt = 
'http://groups.google.com/groups/search?as_q=%s&as_epq=&as_oq=&as_eq=&num=10&scoring=&lr=&as_sitesearch=&as_qdr=&as_drrb=b&as_mind=1&as_minm=1&as_miny=1999&as_maxd=1&as_maxm=1&as_maxy=2009&as_ugroup=%s&as_usubject=&as_uauthors=&safe=off'
     qurls = map(fillurlfmt, [ (urlfmt, ggroup, gkw) for gkw in gkeywords])
     return qurls

if __name__ == "__main__":
     gkeywords = ['rtfm', 'shut']
     ggroups = ['comp.lang.python', 'comp.lang.perl']
     params = [(ggroup, gkeywords) for ggroup in ggroups]
     qurls = map(consqurls, params)
     print qurls

Regards,
mk



From pythonsky at sky.com  Thu Feb  5 07:55:42 2009
From: pythonsky at sky.com (garywood)
Date: Thu, 5 Feb 2009 12:55:42 -0000
Subject: python 3 error i know the file works  in python 2.6 
Message-ID: <EB7B34C0FE3542D5BFB59133577EF96B@Home>

can someone help me please 


#open file and read last names
filename = input('name file')
file = open(filename, 'r')
names_list = file.readlines()
file.close()
#open a file for saving passwords
outfile_name = input('Save passwords')
outfile = open(outfile_name, 'a')


#create a password for each name in list
import random, string
name = ('')
for name in names_list:
    name_prefix = name[0:2]
    number = random.randrange(100,999)
    name_prefix = str.upper(name_prefix)
    password = name_prefix + str(number)
    whole_line = (password)
    print (password)
    outfile_name.write(whole_line)
    outfile_name.close()
    
    print (password)

error
Traceback (most recent call last):
  File "C:\Documents and Settings\Gary\Desktop\python\bembry\pa2.i.py", line 21, in <module>
    outfile_name.write(whole_line)
AttributeError: 'str' object has no attribute 'write'
-------------- next part --------------
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From simon at mullis.co.uk  Thu Feb  5 08:09:17 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 14:09:17 +0100
Subject: Should "open(sys.stdin)" and "open(file, 'r')" be equivalent?
In-Reply-To: <23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
	<23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
Message-ID: <23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>

Last try at getting the indenting to appear correctly..

#!/usr/bin/env python

import glob, os, sys

class TestParse(object):
    def __init__(self):
        if options.stdin:
            self.scan_data(sys.stdin)
        if options.glob:
            self.files = glob.glob(options.glob)
            for f in files:
                fh = open(f, 'r')
                self.scan_data(fh)
                fh.close()

    def scan_data(self,fileobject):
        i = 0
        for line in fileobject:
            print i
            i += 1
            # do stuff with the line...
            pass
        print "finished file"

def main():
    T = TestParse()

if __name__ == "__main__":
    from optparse import OptionParser
    p = OptionParser(__doc__, version="testing 1 2 3")
    p.add_option("--glob", dest="glob", help="""use this glob""")
    p.add_option("--stdin", dest="stdin", action="store_true",
default="False", help="""use stdin""")
    (options, args) = p.parse_args()
    main()


From __peter__ at web.de  Thu Feb  5 08:09:29 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 05 Feb 2009 14:09:29 +0100
Subject: Arguments for map'ped functions
References: <mailman.8870.1233838467.3487.python-list@python.org>
Message-ID: <gmeoe8$673$01$1@news.t-online.com>

mk wrote:

> So I have this function I want to map onto a list of sequences of
> *several* arguments (while I would want to pass those arguments to each
> function in the normal fashion). I realize this is contrived, maybe an

You can either use a list comprehension

[f(*args) for args in seq]

or starmap()

list(itertools.starmap(f, seq))

Peter


From mrkafk at gmail.com  Thu Feb  5 08:17:34 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 14:17:34 +0100
Subject: Flattening lists
Message-ID: <gmeotf$4j6$1@ger.gmane.org>

Hello everybody,

Any better solution than this?

def flatten(x):
     res = []
     for el in x:
         if isinstance(el,list):
             res.extend(flatten(el))
         else:
             res.append(el)
     return res

a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
print flatten(a)


[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Regards,
mk



From simon at mullis.co.uk  Thu Feb  5 08:18:19 2009
From: simon at mullis.co.uk (Simon Mullis)
Date: Thu, 5 Feb 2009 14:18:19 +0100
Subject: [SOLVED] Re: Should "open(sys.stdin)" and "open(file, 'r')" be 
	equivalent?
In-Reply-To: <23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>
References: <23d7e1bb0902050258g3a7b3072w5635b1c9c7ae0d2d@mail.gmail.com>
	<50697b2c0902050312g2aee4b0bu64dda5aa0716b365@mail.gmail.com>
	<23d7e1bb0902050437i72411bdfrd91732169fa5d0a1@mail.gmail.com>
	<23d7e1bb0902050509q60318147r70175d636d220974@mail.gmail.com>
Message-ID: <23d7e1bb0902050518h2e8752c9of1f90596accaa6f5@mail.gmail.com>

Forget it all... I was being very very daft!

The "default = 'False'" in the options for stdin was not being
evaluated as I thought, so the script was waiting for stdin even when
there was the glob switch was used...No stdin equals the script
seeming to "hang".

Ah well.

SM


From lists at cheimes.de  Thu Feb  5 08:18:28 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 14:18:28 +0100
Subject: Ordered dict by default
In-Reply-To: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
Message-ID: <gmeov4$477$1@ger.gmane.org>

andrew cooke schrieb:
> so what is happening with pep 372?
> 
> http://www.python.org/dev/peps/pep-0372/

It's still a draft and hasn't been implemented yet. Now is the time to
get it ready for Python 3.1 and 2.7.

Christian



From andreas.tawn at ubisoft.com  Thu Feb  5 08:22:04 2009
From: andreas.tawn at ubisoft.com (Andreas Tawn)
Date: Thu, 5 Feb 2009 14:22:04 +0100
Subject: python 3 error i know the file works  in python 2.6
In-Reply-To: <EB7B34C0FE3542D5BFB59133577EF96B@Home>
References: <EB7B34C0FE3542D5BFB59133577EF96B@Home>
Message-ID: <8AEDA5E3386EA742B8C24C95FF0C758005B55074@PDC-MAIL3.ubisoft.org>

>#open file and read last names
>filename = input('name file')
>file = open(filename, 'r')
>names_list = file.readlines()
>file.close()
>#open a file for saving passwords
>outfile_name = input('Save passwords')
>outfile = open(outfile_name, 'a')
>
>
>#create a password for each name in list
>import random, string
>name = ('')
>for name in names_list:
>    name_prefix = name[0:2]
>    number = random.randrange(100,999)
>    name_prefix = str.upper(name_prefix)
>    password = name_prefix + str(number)
>    whole_line = (password)
>    print (password)
>    outfile_name.write(whole_line)
>    outfile_name.close()
>    
>    print (password)
> 
>error
>Traceback (most recent call last):
>  File "C:\Documents and Settings\Gary\Desktop\python\bembry\pa2.i.py",
line 21, in <module>
>    outfile_name.write(whole_line)
>AttributeError: 'str' object has no attribute 'write'

You're trying to output to the output filename string rather that the
output file you opened with that filename.

Cheers,

Drea


From BrianVanderburg2 at aim.com  Thu Feb  5 08:22:38 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 08:22:38 -0500
Subject: Flattening lists
In-Reply-To: <gmeotf$4j6$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>
Message-ID: <498AE81E.6020100@aim.com>

mrkafk at gmail.com wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk
>
> -- 
> http://mail.python.org/mailman/listinfo/python-list

I think it may be just a 'little' more efficient to do this:

def flatten(x, res=None):
    if res is None:
       res = []

    for el in x:
       if isinstance(el, (tuple, list)):
          flatten(el, res)
       else:
          res.append(el)

    return res

Brian Vanderburg II


From mrkafk at gmail.com  Thu Feb  5 08:44:09 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 14:44:09 +0100
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <gmeqf9$a0c$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:
>> def flatten(x):
>>     res = []
>>     for el in x:
>>         if isinstance(el,list):
>>             res.extend(flatten(el))
>>         else:
>>             res.append(el)
>>     return res

> 
> I think it may be just a 'little' more efficient to do this:
> 
> def flatten(x, res=None):
>    if res is None:
>       res = []
> 
>    for el in x:
>       if isinstance(el, (tuple, list)):
>          flatten(el, res)
>       else:
>          res.append(el)
> 
>    return res


Hmm why should it be more efficient? extend operation should not be very 
costly?

Regards,
mk



From s.selvamsiva at gmail.com  Thu Feb  5 08:48:11 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Thu, 5 Feb 2009 19:18:11 +0530
Subject: string replace for back slash
In-Reply-To: <gmem3q$p8f$1@ger.gmane.org>
References: <b423b9550902050340n1c452b11t4d53c21c143599ca@mail.gmail.com>
	<gmem3q$p8f$1@ger.gmane.org>
Message-ID: <b423b9550902050548u2567f700ocfdcf3bd1a4e078f@mail.gmail.com>

On Thu, Feb 5, 2009 at 5:59 PM, <rdmurray at bitdance.com> wrote:

> "S.Selvam Siva" <s.selvamsiva at gmail.com> wrote:
> > I tried to do a string replace as follows,
> >
> > >>> s="hi & people"
> > >>> s.replace("&","\&")
> > 'hi \\& people'
> > >>>
> >
> > but i was expecting 'hi \& people'.I dont know ,what is something
> different
> > here with escape sequence.
>
> You are running into the difference between the 'repr' of a string (which
> is what is printed by default at the python prompt) and the actual
> contents of the string.  In the repr the backslash needs to be escaped
> by prefixing it with a backslash, just as you would if you wanted to
> enter a backslash into a string in your program.  If you print the string,
> you'll see there is only one backslash.  Note that you didn't need to
> double the backslash in your replacement string only because it wasn't
> followed by a character that forms an escape...but the repr of that
> string will still have the backslash doubled, and that is really the
> way you should write it in your program to begin with for safety's sake.
>
> Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> s="hi & people"
> >>> replacementstring = "\&"
> >>> replacementstring
> '\\&'
> >>> print replacementstring
> \&
> >>> x = s.replace("&","\\&")
> >>> x
> 'hi \\& people'
> >>> print x
> hi \& people
>
> --
> http://mail.python.org/mailman/listinfo/python-list



Thank you all for your response,

Now i understood the way python terminal expose '\'.



-- 
Yours,
S.Selvam
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From youri_lammers_88 at hotmail.com  Thu Feb  5 09:00:21 2009
From: youri_lammers_88 at hotmail.com (Youri Lammers)
Date: Thu, 5 Feb 2009 15:00:21 +0100
Subject: os.system issues
Message-ID: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>


Ok,
 
I want to run a program called 'muscle' with my python script,
muscle uses the following command:
'muscle.exe -in filename -out filename'
so far I got:
 
import os
args = ['-in filename', '-out filename']
os.system('E:\Programs\muscle\muscle.exe args')
 
However, when I run this nothing happends, no error message, nothing.
 
So what am I doing wrong here?
 
Youri
_________________________________________________________________
De leukste online filmpjes vind je op MSN Video!
http://video.msn.com/video.aspx?mkt=nl-nl
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From kyosohma at gmail.com  Thu Feb  5 09:07:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 5 Feb 2009 06:07:21 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
	<5ef6e64b-1468-4ee2-8261-3ba027ca5370@p2g2000prf.googlegroups.com>
Message-ID: <1cec1f1f-296c-4df6-abc3-447b5790ce41@p2g2000prn.googlegroups.com>

On Feb 4, 5:49?pm, andrew cooke <and... at acooke.org> wrote:
> On Feb 4, 8:06?pm, len <lsumn... at gmail.com> wrote:
>
> > How does one find the methods that are available in the classes.
>
> heh. ?welcome to the wonderful world of wxpython :o(
>
> if you use eclipse to edit your code, then (providing the wind is in
> the right direction and the file you are editing doesn't have any
> syntax errors) pressing F3 when you are on a particular method will
> take you to the definition. ?or, at least, one of the definitions with
> that name.
>
> and if you want to see a list of available methods the simplest way is
> to use tab completion (or dir() in python itself).
>
> if you're not using eclipse (with pydev) check to see if the ide/
> editor you are using has something similar.
>
> also, wxpython comes with some examples, all packaged in a demo
> program. ?that is your best source of documentation. ?go through all
> the examples in there and look at the code (the demo program will show
> you the code and even let you edit it and see the results of your
> changes).
>
> to be honest, wxpython is a bit of a nightmare (imho). but the results
> can be worth it.
>
> good luck,
> andrew

I don't think the docs are any worse than any other complicated third
party package. Reportlab comes to mind...and the wxPython list members
are very helpful.

Mike


From lists at cheimes.de  Thu Feb  5 09:08:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 05 Feb 2009 15:08:14 +0100
Subject: os.system issues
In-Reply-To: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <gmerse$e7j$1@ger.gmane.org>

Youri Lammers schrieb:
> Ok,
>  
> I want to run a program called 'muscle' with my python script,
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
>  
> import os
> args = ['-in filename', '-out filename']
> os.system('E:\Programs\muscle\muscle.exe args')
>  
> However, when I run this nothing happends, no error message, nothing.
>  
> So what am I doing wrong here?

For starters you should use the subprocess module instead of os.system.
Next you have either write "E:\\..." or r"E:\..." (note the trailing 'r').

Try this:

import subprocess
subprocess.check_call(['E:\\Programs\\muscle\\muscle.exe', '-in',
'filename', '-out', 'filename'])

Christian



From kyosohma at gmail.com  Thu Feb  5 09:08:50 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 5 Feb 2009 06:08:50 -0800 (PST)
Subject: How to find wxPython method documentation??
References: <10ead1a8-fc44-4392-b07d-54c00f0619f7@r36g2000prf.googlegroups.com>
Message-ID: <e91f2003-7ef0-4be2-9f68-ae432e990dee@35g2000pry.googlegroups.com>

On Feb 4, 5:06?pm, len <lsumn... at gmail.com> wrote:
> Hi
>
> I am going through the "wxPython in Action" book by Noel Rappin and
> Robin Dunn.
>
> I have been typing in the example programs as I go and play with
> modifing the code.
> Thought I should start trying to find my way around the documentation
> found on the wxPython web site.
>
> The problem I have been having is I can't find the methods or more
> specifically
>
> 'SetBackgroundColour' or 'AddSimpleTool' for example.
>
> How does one find the methods that are available in the classes.
>
> I tried looking at the wxWidgets web site and still had the same
> problem.
>
> Could someone give me a little direction in this?
>
> Thanks
> Len

In addition to what the others have said, there's also an alternate
doc location done up by one guy who seems to have a lot of free time:

http://xoomer.virgilio.it/infinity77/wxPython/index.html

The wiki is also helpful:

http://wiki.wxpython.org/

But I concur that the mailing list is definitely THE place to be to
learn the most once you've gotten comfortable with the toolkit.

Mike


From sgeiger at councilforeconed.org  Thu Feb  5 09:10:06 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Thu, 05 Feb 2009 09:10:06 -0500
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <498AF33E.4080907@councilforeconed.org>

These functions come from goopy:


def flatten1(seq):
  """
  Return a list with the contents of SEQ with sub-lists and tuples 
"exploded".
  This is only done one-level deep.
  """

  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      for val in x:
        lst.append(val)
    else:
      lst.append(x)
  return lst

def flatten(seq):
  """
  Returns a list of the contents of seq with sublists and tuples "exploded".
  The resulting list does not contain any sequences, and all inner sequences
  are exploded.  For example:

  >>> flatten([7,(6,[5,4],3),2,1])
  [7,6,5,4,3,2,1]
  """
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten(el))
    else:
      lst.append(el)
  return lst




Brian Allen Vanderburg II wrote:
> mrkafk at gmail.com wrote:
>> Hello everybody,
>>
>> Any better solution than this?
>>
>> def flatten(x):
>>     res = []
>>     for el in x:
>>         if isinstance(el,list):
>>             res.extend(flatten(el))
>>         else:
>>             res.append(el)
>>     return res
>>
>> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
>> print flatten(a)
>>
>>
>> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>
>> Regards,
>> mk
>>
>> -- 
>> http://mail.python.org/mailman/listinfo/python-list
>
> I think it may be just a 'little' more efficient to do this:
>
> def flatten(x, res=None):
>    if res is None:
>       res = []
>
>    for el in x:
>       if isinstance(el, (tuple, list)):
>          flatten(el, res)
>       else:
>          res.append(el)
>
>    return res
>
> Brian Vanderburg II
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From rdmurray at bitdance.com  Thu Feb  5 09:14:55 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 14:14:55 +0000 (UTC)
Subject: os.system issues
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <gmes8v$fo5$1@ger.gmane.org>

Youri Lammers <youri_lammers_88 at hotmail.com> writes:
> I want to run a program called 'muscle' with my python script=2C
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
> 
> import os
> args = ['-in filename', '-out filename']
> os.system('E:\Programs\muscle\muscle.exe args')
> 
> However when I run this nothing happends no error message nothing.
> 
> So what am I doing wrong here?

You are calling the program muscle with the argument 'args'.

If you want to put your arguments into the system call, you will
want to write it like this:

os.system('E:\Programs\muscle\muscle.exe -in filename -out filename')

If you need to substitute args into the string passed to
os.system, then take a look at python string handling in the
tutorial.

You also will probably want to look at the 'subprocess' module
at some point, which is more flexible than os.system.

--RDM



From mrkafk at gmail.com  Thu Feb  5 09:17:19 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 15:17:19 +0100
Subject: Flattening lists
In-Reply-To: <498AE81E.6020100@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
Message-ID: <gmesde$g8t$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:
 >> def flatten(x):
 >>     res = []
 >>     for el in x:
 >>         if isinstance(el,list):
 >>             res.extend(flatten(el))
 >>         else:
 >>             res.append(el)
 >>     return res

 >
 > I think it may be just a 'little' more efficient to do this:
 >
 > def flatten(x, res=None):
 >    if res is None:
 >       res = []
 >
 >    for el in x:
 >       if isinstance(el, (tuple, list)):
 >          flatten(el, res)
 >       else:
 >          res.append(el)
 >
 >    return res


Hmm why should it be more efficient? extend operation should not be very
costly?

Regards,
mk



From netzhen at gmail.com  Thu Feb  5 09:36:37 2009
From: netzhen at gmail.com (Baolong zhen)
Date: Thu, 5 Feb 2009 22:36:37 +0800
Subject: Flattening lists
In-Reply-To: <gmesde$g8t$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
Message-ID: <a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>

less list creation.

On Thu, Feb 5, 2009 at 10:17 PM, mk <mrkafk at gmail.com> wrote:

> Brian Allen Vanderburg II wrote:
> >> def flatten(x):
> >>     res = []
> >>     for el in x:
> >>         if isinstance(el,list):
> >>             res.extend(flatten(el))
> >>         else:
> >>             res.append(el)
> >>     return res
>
> >
> > I think it may be just a 'little' more efficient to do this:
> >
> > def flatten(x, res=None):
> >    if res is None:
> >       res = []
> >
> >    for el in x:
> >       if isinstance(el, (tuple, list)):
> >          flatten(el, res)
> >       else:
> >          res.append(el)
> >
> >    return res
>
>
> Hmm why should it be more efficient? extend operation should not be very
> costly?
>
>
> Regards,
> mk
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From invalid at invalid  Thu Feb  5 10:16:10 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 05 Feb 2009 09:16:10 -0600
Subject: os.system issues
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
	<mailman.8882.1233843753.3487.python-list@python.org>
Message-ID: <Gt6dnTFsk8knnxbUnZ2dnUVZ_sjinZ2d@posted.visi>

On 2009-02-05, Christian Heimes <lists at cheimes.de> wrote:
> Youri Lammers schrieb:
>> Ok,
>>  
>> I want to run a program called 'muscle' with my python script,
>> muscle uses the following command:
>> 'muscle.exe -in filename -out filename'
>> so far I got:
>>  
>> import os
>> args = ['-in filename', '-out filename']
>> os.system('E:\Programs\muscle\muscle.exe args')
>>  
>> However, when I run this nothing happends, no error message, nothing.
>>  
>> So what am I doing wrong here?
>
> For starters you should use the subprocess module instead of os.system.
> Next you have either write "E:\\..." or r"E:\..." (note the trailing 'r').

Leading 'r'.

Or just skip cmd.exe and use forward slashes like god intended.

-- 
Grant Edwards                   grante             Yow! I'd like MY data-base
                                  at               JULIENNED and stir-fried!
                               visi.com            


From ljjediknight at gmail.com  Thu Feb  5 10:20:55 2009
From: ljjediknight at gmail.com (Luke)
Date: Thu, 5 Feb 2009 07:20:55 -0800 (PST)
Subject: Tkinter
References: <593b7e33-f0ef-434f-b967-a4a1a102aab1@z6g2000pre.googlegroups.com>
	<gcidnWzqds6EcxTUnZ2dnUVZ_oOdnZ2d@pdx.net>
Message-ID: <92bb5b5e-bd93-4bc1-97a0-9d36be5f3a6b@t26g2000prh.googlegroups.com>

Thanks, Its working smoothly now


From dickinsm at gmail.com  Thu Feb  5 10:21:22 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Thu, 5 Feb 2009 07:21:22 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>

On Feb 5, 1:17?pm, mk <mrk... at gmail.com> wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):

Just out of interest, how often do people really need
such a recursive flatten, as opposed to a single-level
version?

I often find myself needing a 'concat' method that
turns a list of lists (or iterable of iterables) into
a single list;  itertools.chain does this quite nicely.
But I don't think I've ever encountered a need for the
full recursive version.

Mark



From durumdara at gmail.com  Thu Feb  5 10:21:29 2009
From: durumdara at gmail.com (durumdara)
Date: Thu, 05 Feb 2009 16:21:29 +0100
Subject: Cheetah and hungarian charset...
Message-ID: <498B03F9.3040109@gmail.com>

Hi!

I wanna ask that have anyone some exp. with Cheetah and the non-ascii chars?

I have a site. The html template documents are saved in ansi format, psp 
liked them.
But the cheetah parser makes ParseError on hungarian characters, like 
"?", "?", "?", etc. When I remove them, I got good result, but I don't 
want to remove them all...

I cannot parse them. Please help me, how to force cheetah to eat them all?

Thanks for your help:
     dd



From james at agentultra.com  Thu Feb  5 10:22:20 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 05 Feb 2009 15:22:20 +0000
Subject: [Web 2.0] Added-value of frameworks?
References: <i6fjo4t7gmj827oq6tp82a39osk9f055dp@4ax.com>
	<498a1dc7$0$10675$426a74cc@news.free.fr>
Message-ID: <877i44c3ir.fsf@agentultra.com>

Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr> writes:

> Gilles Ganault a ?crit :
>> Hello
>>
>> If I wanted to build some social web site such as Facebook, what do
>> frameworks like Django or TurboGears provide over writing a site from
>> scratch using Python?
>
> Quite a lot of abstractions and factorisation of the boilerplate code,
> a known way to organize your application, and possibly a good
> integration of the usual components (and wrt/ Django, a customizable
> yet fairly usable OOTB admin interface). For simple to mediumly
> complex applications, this can mean more than 80% of the grunt
> work. The counterpart is mostly learning and understanding the
> framework, which means you may not save that much time on a first
> project - but it can really pay off then. One of my coworker started
> this morning a (really simple...) project which acceptance tests are
> to begin on monday, and we are all quite confident he'll deliver on
> time, thanks to Django.

Well the big negative is when you application design starts expanding
past the framework design. A percolator makes a decent cup of coffee but
it really isn't meant for making fancy lattes. This is where the 90/10
rule will catch you if you're not careful.

"90% of the effort will be spent on the last 10% of the work."


From jason-sage at creativetrax.com  Thu Feb  5 10:22:29 2009
From: jason-sage at creativetrax.com (jason-sage at creativetrax.com)
Date: Thu, 05 Feb 2009 09:22:29 -0600
Subject: Flattening lists
In-Reply-To: <gmeotf$4j6$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>
Message-ID: <498B0435.9020104@creativetrax.com>

mk wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)

It depends on what you mean by "better".  More features?  Here is the 
function from Sage (http://www.sagemath.org), which is a modified 
version of a more standard implementation to give a max_level argument.

The first few lines of documentation:

def flatten(in_list, ltypes=(list, tuple), max_level=sys.maxint):
   """
   Flattens a nested list.

   INPUT:
       in_list -- a list or tuple
       ltypes -- optional list of particular types to flatten
       max_level -- the maximum level to flatten

   OUTPUT:
       a flat list of the entries of in_list

(lots of examples follow this documentation)

The implementation:  
http://www.sagemath.org/hg/sage-main/file/b0aa7ef45b3c/sage/misc/flatten.py


Jason



From mrkafk at gmail.com  Thu Feb  5 10:24:53 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 16:24:53 +0100
Subject: Flattening lists
In-Reply-To: <a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
References: <gmeotf$4j6$1@ger.gmane.org>
	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
Message-ID: <gmf0c4$eq$1@ger.gmane.org>

Baolong zhen wrote:
> less list creation.

At the cost of doing this at each 'flatten' call:

if res is None:
    res = []

The number of situations of executing above code is the same as the 
number of list creations (once for each 'flatten' call, obviously).

Is list creation really more costly than above?

Regards,
mk



From google at mrabarnett.plus.com  Thu Feb  5 10:29:20 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 15:29:20 +0000
Subject: time: Daylight savings confusion
In-Reply-To: <498AB3E3.1060804@mattnordhoff.com>
References: <ru2dnSMygYA7FRfUnZ2dnUVZ_rydnZ2d@brainstorminternet.net>
	<498AB3E3.1060804@mattnordhoff.com>
Message-ID: <498B05D0.8060706@mrabarnett.plus.com>

Matt Nordhoff wrote:
> Tim H wrote:
>> On Win XP 64bit, Python 2.6.1 64bit
>> 
>> I am trying to rename files by their creation time.
>> 
>> It seems the time module is too smart for its own good here.
>> 
>> time.localtime(os.path.getctime(f)) returns a value one hour off
>> from what windows reports for files that were created when Daylight
>> savings time was in effect (ie when the tm_isdst field is one).  I
>> can kludge it, but am I missing the "right" way to do it?
>> 
>> Tim
>> 
>> full code:
> 
> <snip full code>
> 
>> From what I remember, this is a bug in the Win32 API. Python
>> probably could hack around it, but, well, I guess it doesn't.
> 
> Googling a bit, Perl's Win32::UTCFileTime module [1] provides 
> workarounds (not for Python, of course, but it could probably be
> ported) and explains all the gory details (which I have not read, so
> maybe I misunderstand ;-).
> 
> [1] 
> <http://search.cpan.org/~shay/Win32-UTCFileTime-1.50/lib/Win32/UTCFileTime.pm>
>  <http://xrl.us/beezsv>

Windows does apply the current value of DST when converting from UTC to 
local time.

The problem is that the rules for when DST starts and ends might change 
over time and from place to place, and local time depends on the
timezone too.

Probably the best you can do is just to apply the current rules and 
accept that the result might not match what the local time actually was.


From michele.simionato at gmail.com  Thu Feb  5 10:33:30 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 5 Feb 2009 07:33:30 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>

On Feb 5, 2:17?pm, mk <mrk... at gmail.com> wrote:
> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
> ? ? ?res = []
> ? ? ?for el in x:
> ? ? ? ? ?if isinstance(el,list):
> ? ? ? ? ? ? ?res.extend(flatten(el))
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?res.append(el)
> ? ? ?return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk

Looks fine to me. In some situations you may also use hasattr(el,
'__iter__') instead of isinstance(el, list) (it depends if you want to
flatten generic iterables or only lists).


From google at mrabarnett.plus.com  Thu Feb  5 10:36:14 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 15:36:14 +0000
Subject: Using while loop and if statement to tell if a binary has an
	odd 	or even number of 1's.
In-Reply-To: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
References: mailman.8817.1233796709.3487.python-list@python.org
	<6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
Message-ID: <498B076E.5050006@mrabarnett.plus.com>

Mark Dickinson wrote:
> On Feb 5, 1:18 am, Chris Rebert <c... at rebertia.com> wrote:
>> For an integer:
>> is_even = bin(the_int)[2:].count('1') % 2 == 0
> 
> But the OP has to use if and while.  How about:
> 
> while 2+2 != 5:
>     if 'wkw' in 'just being awkward':
>         is_even = bin(the_int)[2:].count('1') % 2 == 0
>         break
> 
> or (Python 2.5 compatible):
> 
> def count_set_bits(n):
>     # make sure we include an if, to
>     # satisfy OP's requirements:
>     if n < 0:
>         raise ValueError
>     count = 0
>     while n:
>         count += 1
>         n &= n-1
>     return count
> 
> is_even = count_set_bits(the_int) % 2 == 0
> 
> ...but anyone submitting this as a homework
> solution had better be prepared to explain why
> it works.
> 
I haven't seen that algorithm before. Very clever! :-)


From deets at nospam.web.de  Thu Feb  5 10:36:30 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 16:36:30 +0100
Subject: Cheetah and hungarian charset...
In-Reply-To: <mailman.8887.1233847304.3487.python-list@python.org>
References: <mailman.8887.1233847304.3487.python-list@python.org>
Message-ID: <6v0fbuFho2e8U1@mid.uni-berlin.de>

durumdara schrieb:
> Hi!
> 
> I wanna ask that have anyone some exp. with Cheetah and the non-ascii 
> chars?
> 
> I have a site. The html template documents are saved in ansi format, psp 
> liked them.
> But the cheetah parser makes ParseError on hungarian characters, like 
> "?", "?", "?", etc. When I remove them, I got good result, but I don't 
> want to remove them all...
> 
> I cannot parse them. Please help me, how to force cheetah to eat them all?

Please provide tracebacks and code and data examples.

Diez


From Scott.Daniels at Acm.Org  Thu Feb  5 10:54:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 05 Feb 2009 07:54:40 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <mailman.8865.1233835298.3487.python-list@python.org>
References: <498AAC89.5080002@berkeley.edu>
	<mailman.8865.1233835298.3487.python-list@python.org>
Message-ID: <5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>

M.-A. Lemburg wrote:
> On 2009-02-05 10:08, Nick Matzke wrote:
>> ..., I can run this in the ipython shell just fine:
>> a = ["12", "15", "16", "38.2"]
>> dim = int(sqrt(size(a)))
>> ...But if I move these commands to a function in another file, it freaks out:
> You need to add:
> 
> from math import sqrt
or:
     from cmath import sqrt
or:
     from numpy import sqrt

Each with their own, slightly different, meaning.
Hence the reason many of us prefer to import the module
and reference the function as a module attribute.

Note that _many_ (especially older) package documents describe
their code without the module name.  I believe that such behavior
is because, when working to produce prose about a package, it
feels too much like useless redundancy when describing each function
or class as "package.name".


--Scott David Daniels
Scott.Daniels at Acm.Org


From mrkafk at gmail.com  Thu Feb  5 11:00:05 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:00:05 +0100
Subject: Is c.l.py becoming less friendly?
Message-ID: <gmf2e5$9b3$1@ger.gmane.org>


(duck)

542 comp.lang.python rtfm

467 comp.lang.python shut+up

263 comp.lang.perl rtfm

45 comp.lang.perl shut+up




Code:

import urllib2
import re
import time

def fillurlfmt(args):
     urlfmt, ggroup, gkw = args
     return {'group':ggroup, 'keyword':gkw, 'url': urlfmt % (gkw, ggroup)}

def consqurls(args):
     ggroup, gkeywords = args
     urlfmt = 
'http://groups.google.com/groups/search?as_q=%s&as_epq=&as_oq=&as_eq=&num=10&scoring=&lr=&as_sitesearch=&as_drrb=q&as_qdr=&as_mind=1&as_minm=1&as_miny=1999&as_maxd=1&as_maxm=1&as_maxy=2009&as_ugroup=%s&as_usubject=&as_uauthors=&safe=off'
     qurls = map(fillurlfmt, [ (urlfmt, ggroup, gkw) for gkw in gkeywords ])
     return qurls

def flatten_list(x):
     res = []
     for el in x:
         if isinstance(el,list):
             res.extend(flatten_list(el))
         else:
             res.append(el)
     return res

def ggsearch(urldict):
     opener = urllib2.build_opener()
     opener.addheaders = [('User-agent', 'Mozilla/5.0 (Windows; U; 
Windows NT 5.1; en-US; rv:1.8.1.20) Gecko/20081217 (CK-IBM) 
Firefox/2.0.0.20')]
     time.sleep(0.1)
     urlf = opener.open(urldict['url'])
     resdict = {'result': urlf.read()}
     resdict.update(urldict)
     urlf.close()
     return resdict

def extrclosure(resregexp, groupno):
     def extrres(resdict):
         txtgr = resregexp.search(resdict['result'])
         resdict['result']=txtgr.group(groupno)
         return resdict
     return extrres

def delcomma(x):
     x['result'] = x['result'].replace(',','')
     return x

if __name__ == "__main__":
     gkeywords = ['rtfm', 'shut+up']
     ggroups = ['comp.lang.python', 'comp.lang.perl']
     params = [(ggroup, gkeywords) for ggroup in ggroups]
     qurls = map(consqurls, params)
     qurls = flatten_list(qurls)
     gresults = map(ggsearch, qurls)
     resre = re.compile('Results \<b\>1\</b\> - \<b\>.+?\</b\> of about 
\<b\>(.+?)\</b\>')
     gextrsearchresult = extrclosure(resre,1)
     gresults = map(gextrsearchresult, gresults)
     gresults = map(delcomma, gresults)
     for el in gresults:
         print el['result'], el['group'], el['keyword']
         print


This was inspired by 
http://mail.python.org/pipermail/python-list/2002-November/172466.html

Regards,
mk



From apt.shansen at gmail.com  Thu Feb  5 11:01:35 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:01:35 -0800
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>

> That page about Ruby dicts show a higher traversal speed (probably
> just because the CPU has to scan less memory, but I am not sure,
> because mordern CPUs are very complex) but lower insertion speed (I
> think mostly not because the added management of two pointers, but
> because the memory used increases, so there are more cache misses. If
> this turns out as true, then using the xor trick may halve the extra
> memory needed). I have no idea if such different balance of
> performance will lead to on average faster or slower Python programs,
> this has to be tested. But even if the average performance becomes a
> little worse I think making the default Python dict as ordered is a
> positive change for Python too, because built-ins are meant to be as
> flexible as possible, even if they aren't the fastest ones or the less
> memory hungry ones (and keeping dicts ordered decreases the surprises
> a newbie finds, makes some code cleaner, and doctests become simpler
> to write because the order of items may be more defined).

Er, doing a cursory review of my code has an overwhelmingly higher incidence
of insertions then traversals with my dictionaries: many dictionaries are
never traversed and when they are it is only once, and often had tens to
thousands of insertions before that traversal happens.

So a slight decrease in insertion speed at the cost of faster traversal seems
like a complete loss to me.

Now, I also do recognize the utility of ordered dictionaries in some cases, but
exactly what you mean by ordered varies. I have two cases where "ordered"
has the keys are in a specific custom order. I have four cases where "ordered"
means maintaining insertion order. For the former I do sorted(dict) on access
when I need to do something order-related. For the latter I have a simple
ordered dictionary implementation that maintains the keys as a separate list
attached to the dictionary.

But interestingly enough to me, in all the cases where I use an ordered dict
in my code, performance is completely irrelevant. Its tens to hundreds of
items usually, and the best optimization in the world wouldn't add more then
an imperceptible fraction of a second, and the memory lost to the extra
list adds up to nothing relevant.

I'm not claiming my use cases are everyones, not by any means. But: this
seems like a complete lose-lose for an idea from my perspective. Sure you
say an unordered dictionary could then be added for my needs, but... I like
my syntactic sugar, thank you :)

Ordered dictionaries can be useful, its good to see a standard implementation
going into the core, but the default? I hope not!

--Stephen


From upton at virginia.edu  Thu Feb  5 11:02:55 2009
From: upton at virginia.edu (Dan Upton)
Date: Thu, 5 Feb 2009 11:02:55 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <5504f9ac0902050802t5c78ed43we0ef16001b371521@mail.gmail.com>

On Thu, Feb 5, 2009 at 11:00 AM, mk <mrkafk at gmail.com> wrote:
>
> (duck)
>
> 542 comp.lang.python rtfm
>
> 467 comp.lang.python shut+up
>
> 263 comp.lang.perl rtfm
>
> 45 comp.lang.perl shut+up
>
But over how many messages for each group?  Wouldn't the percentage of
messages containing those be more interesting than the raw number? ;p


From apt.shansen at gmail.com  Thu Feb  5 11:05:19 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:05:19 -0800
Subject: Ordered dict by default
In-Reply-To: <7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
Message-ID: <7a9c25c20902050805l7d999cb4p74b6b11ef309ab41@mail.gmail.com>

> Now, I also do recognize the utility of ordered dictionaries in some cases, but
> exactly what you mean by ordered varies. I have two cases where "ordered"
> has the keys are in a specific custom order. I have four cases where "ordered"
> means maintaining insertion order. For the former I do sorted(dict) on access
> when I need to do something order-related. For the latter I have a simple
> ordered dictionary implementation that maintains the keys as a separate list
> attached to the dictionary.

Ooh, as an addendum... I found one case where I want insertion-and-update
order: meaning that its an ordered dictionary that maintains insertion
order, but
an update to a particular item moves that item to the back so an update behaves
like del d[key]; d[key] = value in terms of the key order.

"Ordered Dictionaries" are a bit fuzzy. :)

--S


From mrkafk at gmail.com  Thu Feb  5 11:06:28 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:06:28 +0100
Subject: Flattening lists
In-Reply-To: <0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<0ac212c8-e148-44f8-8f30-050064303c96@f40g2000pri.googlegroups.com>
Message-ID: <gmf2q3$b47$1@ger.gmane.org>

Mark Dickinson wrote:
> I often find myself needing a 'concat' method that
> turns a list of lists (or iterable of iterables) into
> a single list;  itertools.chain does this quite nicely.
> But I don't think I've ever encountered a need for the
> full recursive version.


You're most probably right in this; however, my main goal here was 
finding 'more Pythonic' way of doing this and learning this way rather 
than the practical purpose of flattening deeply nested lists.

Regards,
mk



From marduk at letterboxes.org  Thu Feb  5 11:06:40 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 05 Feb 2009 11:06:40 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <1233850000.12935.4.camel@localhost.localdomain>

Probably that [c.l.]python is becoming more popular and, like most
things as they become popular, it loses its "purity"... much like the
Internet in the early 1990s.





From mrkafk at gmail.com  Thu Feb  5 11:07:10 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:07:10 +0100
Subject: Flattening lists
In-Reply-To: <a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
Message-ID: <gmf2rd$b47$2@ger.gmane.org>

Michele Simionato wrote:

> Looks fine to me. In some situations you may also use hasattr(el,
> '__iter__') instead of isinstance(el, list) (it depends if you want to
> flatten generic iterables or only lists).

Thanks! Such stuff is what I'm looking for.

Regards,
mk



From BrianVanderburg2 at aim.com  Thu Feb  5 11:10:51 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 11:10:51 -0500
Subject: Flattening lists
In-Reply-To: <gmf0c4$eq$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf0c4$eq$1@ger.gmane.org>
Message-ID: <498B0F8B.8090109@aim.com>

mrkafk at gmail.com wrote:
> Baolong zhen wrote:
>> less list creation.
>
> At the cost of doing this at each 'flatten' call:
>
> if res is None:
>    res = []
>
> The number of situations of executing above code is the same as the 
> number of list creations (once for each 'flatten' call, obviously).
>
> Is list creation really more costly than above?
>
Probably not.  I wrote a small test program using a list several levels 
deep, each list containing 5 sublists at each level and finally just a 
list of numbers.  Flattening 1000 times took about 3.9 seconds for the 
one creating a list at each level, and 3.2 for the one not creating the 
list at each level.

Brian Vanderburg II


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 11:11:58 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 17:11:58 +0100
Subject: Couple of noobish question
In-Reply-To: <mailman.8811.1233792865.3487.python-list@python.org>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
Message-ID: <498b0fb8$0$23714$426a74cc@news.free.fr>

Tim Rowe a ?crit :
> 2009/2/4 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr>:
> 
>> # somemodule.py
>>
>> import os
>>
>> if os.uname()[0] == "Linux":
> 
> On an MS Windows system, os.uname()[0] raises an AttributeError

Thanks for the correction - as you may have guessed, I have not used 
windows for years !-)


From digitig at gmail.com  Thu Feb  5 11:14:32 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 16:14:32 +0000
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <aee48b3c0902050814m3f5d27ecg1282784be977c05c@mail.gmail.com>

2009/2/5 mk <mrkafk at gmail.com>:
>
> (duck)
>
> 542 comp.lang.python rtfm
>
> 467 comp.lang.python shut+up
>
> 263 comp.lang.perl rtfm
>
> 45 comp.lang.perl shut+up

Yes, but is there any real traffic on comp.lang.perl nowadays?

Sorry, cheap shot ;-)

-- 
Tim Rowe


From google at mrabarnett.plus.com  Thu Feb  5 11:20:46 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 16:20:46 +0000
Subject: Ordered dict by default
In-Reply-To: <7x7i45qiyo.fsf@ruckus.brouhaha.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <498B11DE.8000804@mrabarnett.plus.com>

Paul Rubin wrote:
> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.
> 
[snip]
You're confusing "ordered" with "sorted"! :-)

A list is an ordered collection, for example.


From skip at pobox.com  Thu Feb  5 11:20:59 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu,  5 Feb 2009 10:20:59 -0600 (CST)
Subject: Is the subprocess module robust enough in 2.4?
Message-ID: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>

The subprocess module was added in Python 2.4.  I'm running 2.4.5 at work.
I know it's seen many bugfixes since first released.  Is the version in 2.4
robust enough to use in preference to os.popen and friends?

Thx,

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From deets at nospam.web.de  Thu Feb  5 11:22:31 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 17:22:31 +0100
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8892.1233849621.3487.python-list@python.org>
References: <mailman.8892.1233849621.3487.python-list@python.org>
Message-ID: <6v0i28Fhcr76U1@mid.uni-berlin.de>

mk schrieb:
> 
> (duck)
> 
> 542 comp.lang.python rtfm
> 
> 467 comp.lang.python shut+up
> 
> 263 comp.lang.perl rtfm
> 
> 45 comp.lang.perl shut+up

It appears to me that comp.lang.perl isn't even active anymore. Or 
googles interface is just crappy.

c.l.perl.misc seems to be the place to search.

And raw numbers are nothing without actual postings. FWIW, I can't 
remember reading the last time RTFM here, but then I usually skip the 
giant-size horse-beatings about GIL removal and encapsulation...


Diez


From mrkafk at gmail.com  Thu Feb  5 11:29:41 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 05 Feb 2009 17:29:41 +0100
Subject: Flattening lists
In-Reply-To: <498B0F8B.8090109@aim.com>
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>	<gmf0c4$eq$1@ger.gmane.org>
	<498B0F8B.8090109@aim.com>
Message-ID: <gmf45k$h3p$1@ger.gmane.org>

Brian Allen Vanderburg II wrote:

>> Is list creation really more costly than above?
>>
> Probably not.  I wrote a small test program using a list several levels 
> deep, each list containing 5 sublists at each level and finally just a 
> list of numbers.  Flattening 1000 times took about 3.9 seconds for the 
> one creating a list at each level, and 3.2 for the one not creating the 
> list at each level.

Hmm, I'm surprised by even that! Apparently list creation is more 
expensive than I thought - it seems somewhat more expensive than the 
cost of interpreting bytecode for "if var is None". Either list creation 
is somewhat costly, or "if var is None" is really cheap.

Regards,
mk



From apt.shansen at gmail.com  Thu Feb  5 11:41:36 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 5 Feb 2009 08:41:36 -0800
Subject: Flattening lists
In-Reply-To: <gmf45k$h3p$1@ger.gmane.org>
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf0c4$eq$1@ger.gmane.org> <498B0F8B.8090109@aim.com>
	<gmf45k$h3p$1@ger.gmane.org>
Message-ID: <7a9c25c20902050841y57169afeid2d3b708faeafad6@mail.gmail.com>

> Either list creation is somewhat
> costly, or "if var is None" is really cheap.

"if x is y" is extremely cheap, I believe. Unlike most comparisons
which are (relatively) expensive, that one is just comparing simple
object address. You can't override "is" so there's a whole series of
checks that don't have to get done. You don't have to go through the
richcompare machinery, check if there's a __ne__, etc, etc.

--S


From james at agentultra.com  Thu Feb  5 11:45:55 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 05 Feb 2009 16:45:55 +0000
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <873aesbzng.fsf@agentultra.com>

mk <mrkafk at gmail.com> writes:

> Hello everybody,
>
> Any better solution than this?
>
> def flatten(x):
>     res = []
>     for el in x:
>         if isinstance(el,list):
>             res.extend(flatten(el))
>         else:
>             res.append(el)
>     return res
>
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> print flatten(a)
>
>
> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> Regards,
> mk

http://mail.python.org/pipermail/python-list/2005-July/330367.html


From siona at chiark.greenend.org.uk  Thu Feb  5 11:49:22 2009
From: siona at chiark.greenend.org.uk (Sion Arrowsmith)
Date: 05 Feb 2009 16:49:22 +0000 (GMT)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<mailman.8885.1233843910.3487.python-list@python.org>
Message-ID: <Ibk*KySys@news.chiark.greenend.org.uk>

mk  <mrkafk at gmail.com> wrote:
>Brian Allen Vanderburg II wrote:
>> I think it may be just a 'little' more efficient to do this:
>> 
>> def flatten(x, res=None):
>>    if res is None:
>>       res = []
>>    for el in x:
>>       if isinstance(el, (tuple, list)):
>>          flatten(el, res)
>>       else:
>>          res.append(el)
>>    return res
>
>
>Hmm why should it be more efficient [than
def flatten(x):
    res = []
    for el in x:
        if isinstance(el,list):
            res.extend(flatten(el))
       else:
            res.append(el)
    return res

]? extend operation should not be very costly?

It's not a question of extend/append, it's the fact that your
original function creates (and destroys) a new list for every
recursive call. Which, if you've got large nested lists, will
have an impact.

-- 
\S -- siona at chiark.greenend.org.uk -- http://www.chaos.org.uk/~sion/
   "Frankly I have no feelings towards penguins one way or the other"
        -- Arthur C. Clarke
   her nu become? se bera eadward ofdun hl?ddre heafdes b?ce bump bump bump


From rdmurray at bitdance.com  Thu Feb  5 11:49:25 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 16:49:25 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
Message-ID: <gmf5al$m68$1@ger.gmane.org>

Baolong zhen <netzhen at gmail.com> wrote:
> On Thu, Feb 5, 2009 at 10:17 PM, mk <mrkafk at gmail.com> wrote:
>
> > Brian Allen Vanderburg II wrote:
> > >> def flatten(x):
> > >>     res = []
> > >>     for el in x:
> > >>         if isinstance(el,list):
> > >>             res.extend(flatten(el))
> > >>         else:
> > >>             res.append(el)
> > >>     return res
> >
> > >
> > > I think it may be just a 'little' more efficient to do this:
> > >
> > > def flatten(x, res=None):
> > >    if res is None:
> > >       res = []
> > >
> > >    for el in x:
> > >       if isinstance(el, (tuple, list)):
> > >          flatten(el, res)
> > >       else:
> > >          res.append(el)
> > >
> > >    return res
> >
> >
> > Hmm why should it be more efficient? extend operation should not be very
> > costly?
>
> less list creation.

(Took me a while to find the content of your post because
you top posted it.  I've taken the liberty of correcting that.)

This is all premature optimization, except for the goopy code, which is
presumably used enough to make it worth optimizing.  And guess what?
The goopy code wins.  What the people theorizing about the speed of
extend vs list creation miss is that the things with high overhead in the
above functions are (1) isinstance and (2) the recursive function call.
The goopy code avoids this by using type and is, and by unrolling the
lowest level without a function call.  On the other hand, extend
_is_ faster than append if you aren't creating a new list, so the
goopy code can be optimized a little more.

I remembered the bit about high function call overhead, but the rest
of it measured:

temp.py
---------------------------------------------------------------------------------
from __future__ import print_function
from timeit import Timer

def flatten1(x):
    res = []
    for el in x:
        if isinstance(el, list):
            res.extend(flatten1(el))
        else:
            res.append(el)
    return res

def flatten1a(x):
    res = []
    for el in x:
        if isinstance(el, (tuple, list)):
            res.extend(flatten1a(el))
        else:
            res.append(el)
    return res

def flatten1b(x):
    res = []
    for el in x:
        if type(el) is list or type(el) is tuple:
            res.extend(flatten1b(el))
        else:
            res.append(el)
    return res


def flatten2(x, res=None):
    if res is None:
       res = []
    for el in x:
       if isinstance(el, list):
          flatten2(el, res)
       else:
          res.append(el)
    return res


def flatten2a(x, res=None):
    if res is None:
       res = []
    for el in x:
       if isinstance(el, (tuple, list)):
          flatten2a(el, res)
       else:
          res.append(el)
    return res


def flatten2b(x, res=None):
    if res is None:
       res = []
    for el in x:
       if type(el) is list or type(el) is tuple:
          flatten2b(el, res)
       else:
          res.append(el)
    return res



def flatten3z(seq):
  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      for val in x:
        lst.append(val)
    else:
      lst.append(x)
  return lst

def flatten3(seq):
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten3z(el))
    else:
      lst.append(el)
  return lst


def flatten3y(seq):
  lst = []
  for x in seq:
    if type(x) is list or type(x) is tuple:
      lst.extend(x)
    else:
      lst.append(x)
  return lst

def flatten3a(seq):
  lst = []
  for el in seq:
    if type(el) == list or type(el) is tuple:
      lst.extend(flatten3y(el))
    else:
      lst.append(el)
  return lst



l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]

cases = dict(
    base = Timer(),
    c1 = Timer("flatten1(l)", "from temp import flatten1, l"),
    c1a = Timer("flatten1a(l)", "from temp import flatten1a, l"),
    c1b = Timer("flatten1b(l)", "from temp import flatten1b, l"),
    c2 = Timer("flatten2(l)", "from temp import flatten2, l"),
    c2a = Timer("flatten2a(l)", "from temp import flatten2a, l"),
    c2b = Timer("flatten2b(l)", "from temp import flatten2b, l"),
    c3 = Timer("flatten3(l)", "from temp import flatten3, l"),
    c3a = Timer("flatten3a(l)", "from temp import flatten3a, l"),
)

if __name__=="__main__":
    for (name, case) in sorted(cases.items()):
        print("{0:4s} {1}".format(name, case.timeit()))

-----------------------------------------------------------------------------

It is also interesting to note that python3.0 is faster in this
particular case (unless there are timing vagrancies on my machine, which
is possible, though the results were fairly consistent over several runs
of the script).  The second run below is using python2.6.1.

>src/python/Python-3.0/python temp.py
base 0.0278329849243
c1   30.4776289463
c1a  44.3886289597
c1b  32.5621030331
c2   25.6131818295
c2a  39.0944678783
c2b  27.1573381424
c3   15.346280098
c3a  14.3178970814

>python temp.py 
base 0.0288269519806
c1   35.8193409443
c1a  52.3054969311
c1b  36.3652667999
c2   32.3255820274
c2a  47.71251297
c2b  32.6813359261
c3   16.6060569286
c3a  15.1056449413

--RDM



From linuxguy123 at gmail.com  Thu Feb  5 12:13:15 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Thu, 05 Feb 2009 10:13:15 -0700
Subject: HOWTO for setting up a PyQt project in Eclipse ?
Message-ID: <1233853995.25301.12.camel@localhost.localdomain>

Does anyone know of a HOWTO for setting up a PyQt project in Eclipse ?

I know about setting up a PyDev project, just wondering how to integrate
the QtDesigner parts.  

For example, should I save the QtDesigner project in the root PyDev
directory ?

Thanks



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:03 -0200
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <op.uovfp4ptx6zn5v@gabriel.sleipnir-bsas>

En Thu, 05 Feb 2009 04:48:13 -0200, Spacebar265 <spacebar265 at gmail.com>
escribi?:

> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.

Read the file one line at a time, and process each line one character at a
time:

with open(filename, "r") as f:
    for line in f:
      for c in line:
        process(c)

But probably you want to process one *word* at a time; the easiest way
(perhaps inaccurate) is to just split on whitespace:

    ...
      for word in line.split():
        process(word)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:12 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:12 -0200
Subject: sorting mesh data an from abaqus simulation
References: <f90d1a1c0902020410p3233185ey8ad425edfcff18d6@mail.gmail.com>
Message-ID: <op.uovgq702x6zn5v@gabriel.sleipnir-bsas>

En Mon, 02 Feb 2009 10:10:15 -0200, Alessandro Zivelonghi
<zasaconsulting at gmail.com> escribi?:

> *Ntop = odb.rootAssembly.instances['PART-1-1'].nodeSets['TOP'].nodes
> *
> Problem:
> 1) the list of nodes Ntop contains all the node labels [2673,   2675,
> 2676,   2677,   2678,   3655,   3656, 119939, 124154, 127919] already
> ordered in ascending order.
> What I need is the same list *ordered by coordinate_x* of each node, i.e.
> from left to right in the model (unfortunately, for example node 124154
> cames before node 3656 in the model, if you read the model from left to
> right)

Use the key= argument to the sorted() builtin function
<http://docs.python.org/library/functions.html#sorted>

def get_node_x(node):
    return node.coordinates[0]

sorted_nodes = sorted(Ntop, key=get_node_x)

(For a list of reasonable size, that's fine. For a giant list, this could
be written more efficiently, although less readable)

> 1b) I don't understand which kind of data are EL, N, Ntop (list?) and how
> can I sort Ntop  with the criterium based on coordinate_x (coordinate[0])

AFAIK those are plain lists. You can try:

py> print type(Ntop)

and see what happens. If you don't get <type 'list'>, try with:

py> type(Ntop).mro()

to see the chain of base classes.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:21 -0200
Subject: subprocess.Popen not creating a pipe
References: <6c3f5e6c0902011046i59655f3cp2a81b3deb9258c61@mail.gmail.com>
	<6c3f5e6c0902011200s47372b8g49c794b7fa62a06b@mail.gmail.com>
Message-ID: <op.uovhcrjxx6zn5v@gabriel.sleipnir-bsas>

En Sun, 01 Feb 2009 18:00:36 -0200, Andrew Parker <gbofspam at gmail.com>
escribi?:

> On Sun, Feb 1, 2009 at 1:46 PM, Andrew Parker <gbofspam at gmail.com> wrote:
>> I'm having some fun with Popen.  I have the following line:
>>
>>    process = subprocess.Popen(command, stdout=subprocess.PIPE,
>> stderr=subprocess.STDOUT)
>>    print process.stdout
>>
>> Under normal circumstances, this displays:
>>
>>    <open file '<stdout>', mode 'w' at 0xb7f8e068>
>>
>> However, I have a binary that I use to kick off this script, and when
>> that runs, it displays:
>>
>>    None
>>
>> So, two questions:
>>
>>    1.  What the heck is this binary doing that upsets Popen so much?
>>    2.  What can *my script* do to get around this problem.
>>
>> Unfortunately I'm stuck using this binary, so its the python where I
>> have to solve this.
>
> so, tracing through subprocess.Popen, I see that os.pipe() is being
> invoked for stdout.  This is returning (0, 3), and I assume the 0 is
> conflicting with what python is assuming is stdin.  Calling pipe()
> before Popen gets around my problem, as the pipe the Popen gets then
> returns (4,5) which Popen seems happy with.

Seems that "your binary" is closing stdin before running your script, so
the first available file descriptor is 0.

> Sounds like a bug.  Should I report this, or is it expected/known  
> behaviour?

It's hardly a Python error, and I don't think the subprocess module should
consider this very special case, but you may report it at
http://bugs.python.org/ anyway.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb  5 12:16:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 05 Feb 2009 15:16:35 -0200
Subject: Structuring Modules with a Ubiquitous Base Class (Circular
	Dependencies)
References: <c575dccf-4be3-4b0d-8867-190afcda3352@n10g2000vbl.googlegroups.com>
	<b61d3f95-f02f-4a54-8d8a-b62b9285082f@r24g2000vbp.googlegroups.com>
Message-ID: <op.uovgxcczx6zn5v@gabriel.sleipnir-bsas>

En Wed, 04 Feb 2009 21:12:58 -0200, andrew cooke <andrew at acooke.org>
escribi?:

> On Feb 4, 7:49?pm, andrew cooke <and... at acooke.org> wrote:
>> This leads to a circular dependency - the base class wants to import
>> the components, which in turn want to import the base class.
>
> well, to partially answer my own question, this is certainly
> possible.  in the general case it might get quite complex, but for the
> structure described it is quite simple.  the 'trick' is to import the
> component in the *method* of the common base class.
>
> for example:
>
> class Base(object):
>
>     def __init__(self):
>         from first import First
>         from second import Second
>         self.first = lambda *args: First(*args)
>         self.second = lambda *args: Second(*args)
>
> where First, defined in first, subclasses Base in the normal way.
>
> however, i suspect this will have a performance hit, since "linking"
> is being done at "run time" rather than "compile time".  anyone have
> any guidance on how serious that would be?  i guess it could be
> ameliorated by doing the work in the constructor (as above, which is
> just that way for a compact example - in "real life" the components
> are used in a more complex manner).

There is no "linking" step in Python, all is done at run time.
Once a module is imported the first time, any subsequent import is very
cheap.

> and i still suspect there is a more efficient metaclass or similar
> approach.

This approach is fine to me.

-- 
Gabriel Genellina



From python.list at tim.thechases.com  Thu Feb  5 12:26:32 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 05 Feb 2009 11:26:32 -0600
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <498B2148.80401@tim.thechases.com>

> (duck)
> 
> 542 comp.lang.python rtfm
> 467 comp.lang.python shut+up
> 263 comp.lang.perl rtfm
> 45 comp.lang.perl shut+up

Is this where we tell you to shut up? <gdr> ;-)

As others mentioned, the raw numbers don't mean much without a 
total-volume-of-posts to demonstrate the percentage.

It would also be interesting to see how many of those posts are 
concentrated in certain threads -- for the most part, c.l.python 
has been a pretty civil place, but a few threads have degraded 
into puerile spats.

-tkc





From rdmurray at bitdance.com  Thu Feb  5 12:29:46 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 17:29:46 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org> <498AE81E.6020100@aim.com>
	<gmesde$g8t$1@ger.gmane.org>
	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>
	<gmf5al$m68$1@ger.gmane.org>
Message-ID: <gmf7m9$20a$1@ger.gmane.org>

Quoth rdmurray at bitdance.com:
> This is all premature optimization, except for the goopy code, which is
> presumably used enough to make it worth optimizing.  And guess what?
> The goopy code wins.  What the people theorizing about the speed of
> extend vs list creation miss is that the things with high overhead in the
> above functions are (1) isinstance and (2) the recursive function call.
> The goopy code avoids this by using type and is, and by unrolling the
> lowest level without a function call.  On the other hand, extend
> _is_ faster than append if you aren't creating a new list, so the
> goopy code can be optimized a little more.
> 
> I remembered the bit about high function call overhead, but the rest
> of it measured:

Oooh, that's embarrassing.  Not only didn't I read the code carefully
enough, I didn't test the actual output of the functions.  The goopy
code doesn't flatten to arbitrary depth, so of course it is faster.

--RDM



From fakeaddress at nowhere.org  Thu Feb  5 12:31:56 2009
From: fakeaddress at nowhere.org (Bryan Olson)
Date: Thu, 05 Feb 2009 09:31:56 -0800
Subject: Ordered dict by default
In-Reply-To: <mailman.8900.1233850850.3487.python-list@python.org>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
	<mailman.8900.1233850850.3487.python-list@python.org>
Message-ID: <tjFil.10045$8_3.4522@flpi147.ffdc.sbc.com>

MRAB wrote:
> Paul Rubin wrote:
>> bearophileHUGS at lycos.com writes:
>>> Now Ruby dicts are ordered by default:
>>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
>>
>> Maybe I didn't read that carefully enough, but it looks like "ordered"
>> means the dict records come out in the same order you inserted them
>> in.  That is if you insert B,A,D,C in that order, you get them out in
>> that order.  I would have thought an ordered dict meant you get A,B,C,D,
>> which seems a lot more useful.
>>
> [snip]
> You're confusing "ordered" with "sorted"! :-)

He's really not.

   http://en.wikipedia.org/wiki/Ordered_set

> A list is an ordered collection, for example.

True.


-- 
--Bryan


From fakeaddress at nowhere.org  Thu Feb  5 12:36:06 2009
From: fakeaddress at nowhere.org (Bryan Olson)
Date: Thu, 05 Feb 2009 09:36:06 -0800
Subject: Ordered dict by default
In-Reply-To: <mailman.8895.1233849922.3487.python-list@python.org>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
	<mailman.8895.1233849922.3487.python-list@python.org>
Message-ID: <onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>

Stephen Hansen wrote:
> Ooh, as an addendum... I found one case where I want insertion-and-update
> order: meaning that its an ordered dictionary that maintains insertion
> order, but
> an update to a particular item moves that item to the back so an update behaves
> like del d[key]; d[key] = value in terms of the key order.
> 
> "Ordered Dictionaries" are a bit fuzzy. :)

A few bits fuzzy. Is the following True or False if dict is insert-ordered?

    dict(a=6, b=7) == dict(b=7, a=6)



-- 
--Bryan


From digitig at gmail.com  Thu Feb  5 12:37:28 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 17:37:28 +0000
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <498B2148.80401@tim.thechases.com>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
Message-ID: <aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>

2009/2/5 Tim Chase <python.list at tim.thechases.com>:

> Is this where we tell you to shut up? <gdr> ;-)

[snip]

> It would also be interesting to see how many of those posts are concentrated
> in certain threads

And, as you have clearly demonstrated, how many of those posts also
contain a smiley or some other form of hedging in a position that
could modify the "unfriendly" text?


-- 
Tim Rowe


From upton at virginia.edu  Thu Feb  5 12:40:24 2009
From: upton at virginia.edu (Dan Upton)
Date: Thu, 5 Feb 2009 12:40:24 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
	<aee48b3c0902050937m6e2768f7yf938a52d4aa5236a@mail.gmail.com>
Message-ID: <5504f9ac0902050940q7eb0d2bp8d17e9650c4b1659@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:37 PM, Tim Rowe <digitig at gmail.com> wrote:
> 2009/2/5 Tim Chase <python.list at tim.thechases.com>:
>
>> Is this where we tell you to shut up? <gdr> ;-)
>
> [snip]
>
>> It would also be interesting to see how many of those posts are concentrated
>> in certain threads
>
> And, as you have clearly demonstrated, how many of those posts also
> contain a smiley or some other form of hedging in a position that
> could modify the "unfriendly" text?

I'd be amused to see "shut up and rtfm ;)"


From digitig at gmail.com  Thu Feb  5 12:42:02 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 5 Feb 2009 17:42:02 +0000
Subject: Couple of noobish question
In-Reply-To: <498b0fb8$0$23714$426a74cc@news.free.fr>
References: <cEjil.30222$Sp5.22919@text.news.virginmedia.com>
	<498a1b1d$0$24204$426a74cc@news.free.fr>
	<mailman.8811.1233792865.3487.python-list@python.org>
	<498b0fb8$0$23714$426a74cc@news.free.fr>
Message-ID: <aee48b3c0902050942i6bb467am7c44c3a1a193a4cd@mail.gmail.com>

2009/2/5 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:

> Thanks for the correction - as you may have guessed, I have not used windows
> for years !-)

And I can't get Linux running (more precisely, I can't /keep/
X-Windows running). Isn't it a good job that Python is cross-platform
-- as long as we stay clear of the os module :-)


-- 
Tim Rowe


From engr.amkhan at gmail.com  Thu Feb  5 12:46:03 2009
From: engr.amkhan at gmail.com (Ahmed Majeed)
Date: Thu, 5 Feb 2009 09:46:03 -0800 (PST)
Subject: Python Installation Error
Message-ID: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>

Hi,
I am working over a research project and need Python 2.3 or later to
be installed on my Intel Centrino machine, running Fedora 9 as OS. I
have downloaded latest stable release Python 2.6.1 from Python.org,
but when I tried installing it, terminal returned an error on 'make',
saying:

"Failed to find the necessory Bits to build these modules:
_tkinter     bsddb185,     sunaaudiodev
To find the necessory bits, look in setup.py in detect_modules() for
the module's name."

How should I correct this and go ahead for installation. Anxiously
waiting reply and thanking you in anticiaption.

-Ahmed


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb  5 12:58:50 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 05 Feb 2009 18:58:50 +0100
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8912.1233855452.3487.python-list@python.org>
References: <gmf2e5$9b3$1@ger.gmane.org> <498B2148.80401@tim.thechases.com>
	<mailman.8912.1233855452.3487.python-list@python.org>
Message-ID: <498b28c3$0$23719$426a74cc@news.free.fr>

Tim Rowe a ?crit :
> 2009/2/5 Tim Chase <python.list at tim.thechases.com>:
> 
>> Is this where we tell you to shut up? <gdr> ;-)
> 
> [snip]
> 
>> It would also be interesting to see how many of those posts are concentrated
>> in certain threads
> 
> And, as you have clearly demonstrated, how many of those posts also
> contain a smiley or some other form of hedging in a position that
> could modify the "unfriendly" text?
> 
Not to mention when the "rtfm" comes with a pointer to the relevant url 
and a couple explanations.



From bearophileHUGS at lycos.com  Thu Feb  5 13:04:35 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 10:04:35 -0800 (PST)
Subject: where clause
Message-ID: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>

This comes after a small discussion in another Python newsgroup.
Haskell supports a where clause, that's syntactic sugar that allows
you to define things like this:

p = a / b
  where
    a = 20 / len(c)
    b = foo(d)

That means:

a = 20 / len(c)
b = foo(d)
p = a / b

I don't know how much good this syntax can be in my Python programs,
probably I have to use it some time to judge.

In the Python shell you usally have to use a bottom-up style of
programming, while a where may allow you a more top-down too. I can
enjoy this.

Compared to Haskell a possible problem may from mutability, in Haskell
often the order of the operations isn't important (it's only/mostly
significant during I/O), while in Python is generally important.

The interpreter has to look ahead, to use such 'where', because the
point of 'where' is to allow the programmer with such inversions.

In Python you probably want to put a : after where.
But that Haskell syntax also enjoys having where too indented, this is
less easy (or impossible?) to mix with the usual Python syntax.

Bye,
bearophile


From philip at semanchuk.com  Thu Feb  5 13:08:42 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 5 Feb 2009 13:08:42 -0500
Subject: How to call python from a foreign language thread (C++)
In-Reply-To: <a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>
References: <c2e4f39e-219a-492e-a4e1-a9ab3f0ae17a@r41g2000prr.googlegroups.com>
	<mailman.8715.1233686654.3487.python-list@python.org>
	<a4db8212-a6bb-4806-81a3-dd0816afc3a4@e10g2000vbe.googlegroups.com>
Message-ID: <51318B30-3A5F-43D8-B2CC-5084F366B02E@semanchuk.com>


On Feb 3, 2009, at 11:37 PM, Victor Lin wrote:

> It does not work. But however, thanks your help. I have tired so many
> methods to do. But it
> crash...crash..deadlock...deadlock..crash...crash... I have no any
> tried success. I am going crazy. Could someone help me, thanks.


Hi Victor,
I have some code that works, although I'm not terribly confident of  
it. The Python documentation in this area is as clear as mud. I'd be  
interested to see if my code works for you as well.

This is part of my function that the Python code calls to set up the  
callback:

if (!PyEval_ThreadsInitialized()) {
    DPRINTF("calling PyEval_InitThreads()\n");
    PyEval_InitThreads();
    // PyEval_InitThreads() acquires the GIL on my behalf but
    // I don't want it at the moment.
    PyEval_ReleaseLock();
}

This sets up the GIL if necessary (i.e. if this is a single-threaded  
program) and is a no-op otherwise (i.e. if the app has already created  
a Python thread).

Then I have this function to perform the callback. It is invoked in a  
new C thread. Comments are inline.

void process_notification(union sigval notification_data) {
     /* Invoked by the system in a new thread as notification of a  
message
        arriving in the queue. */
     PyObject *arglist;
     PyObject *result;
     PyGILState_STATE gstate;
     PyThreadState *main_thread;
     PyThreadState *callback_thread;
     MessageQueue *self = notification_data.sival_ptr;

     DPRINTF("C thread %ld invoked\n", pthread_self());

     // PyGILState_Ensure() implicitly acquires the GIL so I don't need
     // to call PyEval_AcquireLock().
     DPRINTF("Calling PyGILState_Ensure()\n");
     gstate = PyGILState_Ensure();

     // Get the current thread state so that I have an interpreter to
     // which to point.
     DPRINTF("Calling PyThreadState_Get()\n");
     main_thread = PyThreadState_Get();

     // Create a new Python thread for the callback.
     DPRINTF("Calling PyThreadState_New()\n");
     callback_thread = PyThreadState_New(main_thread->interp);

     // Make the callback thread current.
     DPRINTF("Calling PyThreadState_Swap()\n");
     PyThreadState_Swap(callback_thread);

     // Perform the callback.
     arglist = Py_BuildValue("(O)", self->notification_function_param);
     result = PyEval_CallObject(self->notification_function, arglist);
     Py_DECREF(arglist);

     DPRINTF("Done calling\n");

     // Clean up my internal pointers
     Py_XDECREF(self->notification_function);
     Py_XDECREF(self->notification_function_param);
     self->notification_function = NULL;
     self->notification_function_param = NULL;

     // Now unwind the Python thread/GIL stuff above
     DPRINTF("Calling PyThreadState_Swap()\n");
     PyThreadState_Swap(main_thread);

     DPRINTF("Calling PyThreadState_Clear()\n");
     PyThreadState_Clear(callback_thread);

     DPRINTF("Calling PyThreadState_Delete()\n");
     PyThreadState_Delete(callback_thread);

     // PyGILState_Ensure() acquires the lock, but does  
PyGILState_Release()
     // release it? The documentation doesn't say, but it seems like  
it does.
     DPRINTF("Calling PyGILState_Release()\n");
     PyGILState_Release(gstate);

     DPRINTF("exiting thread\n");
};



This code works (in my limited testing) regardless of whether or not  
the Python code has created a thread. For the threaded test, I created  
a background thread that prints "ding!" every second. That thread  
continued to run even after my callback thread was invoked which I  
assume means that I released the GIL properly.

As I mentioned before, this is part of my posix_ipc extension. This  
code (assuming I feel confident enough to release it) will be in the  
next version that should be out soon, so you will have a full working  
example with which to experiment.

HTH,
Philip





From bearophileHUGS at lycos.com  Thu Feb  5 13:10:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 10:10:42 -0800 (PST)
Subject: Ordered dict by default
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com> 
	<mailman.8895.1233849922.3487.python-list@python.org>
	<onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>
Message-ID: <80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>

Bryan Olson:
> A few bits fuzzy. Is the following True or False if dict is insert-ordered?
> ? ? dict(a=6, b=7) == dict(b=7, a=6)

In my odict implementation I have disallowed that syntax because if
you want to define a mydict(**kwds) function that allows a syntax
like:

mydict(a=6, b=7)

it takes a dict as argument, such dict is currently not ordered. If
built-in dicts become ordered, then that dict too may become
ordered :-)

Anyway, maybe it's good to ignore the inserting order of items when
you look for odict equality.

Bye,
bearophile


From aahz at pythoncraft.com  Thu Feb  5 13:24:13 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 Feb 2009 10:24:13 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
Message-ID: <gmfasd$drp$1@panix3.panix.com>

In article <a22c77c4-a812-4e42-8972-6f3eedf72bb9 at l33g2000pri.googlegroups.com>,
Michele Simionato  <michele.simionato at gmail.com> wrote:
>
>Looks fine to me. In some situations you may also use hasattr(el,
>'__iter__') instead of isinstance(el, list) (it depends if you want to
>flatten generic iterables or only lists).

Of course, once you do that, you need to special-case strings...
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From kellrott at gmail.com  Thu Feb  5 13:38:12 2009
From: kellrott at gmail.com (Kyle)
Date: Thu, 5 Feb 2009 10:38:12 -0800 (PST)
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
Message-ID: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>

I wanted to share a Python based project which I've been working on.
Python Integrated Parallel Pipeline EnviRonment (PIPPER) is an MPI
based programming environment that works much like an OpenMP on Python
code.  It is designed to create a python programming environment where
parallel computations on a set of distributed memory processors (you
may call it a cluster, or a Beowulf cluster) is easy to accomplish.
The idea is to make writing parallel code easy in order to promote
rapid development of script based distributed calculations.
There are tools, such as MPI or PVM that help with communicating
between processes running on different machines, but most people are
quickly scared off by the additional complexity in programming.
PIPPER eliminates this barrier to entry by automating the process of
data passing and job scheduling.
Most importantly is that there is no code 'lock-in'.  PIPPER works as
a pre-parser and is designed to be completely backward compatible with
a single CPU python environment.  If you write a script for PIPPER, it
will still work on systems that don't have PIPPER installed.

You can find the source code and documentation at http://pipper.sourceforge.net

A 'Hello Work' example of PIPPER code:

#!/usr/bin/python

import sys
import os

def do_call(x,y):
	print "Hello World", x, y, os.getpid()

if __name__ == '__pipper_main__':
	a_range = range( int(sys.argv[1]) )
	#pragma pipper_start
	for a in  a_range :
		for b in a_range :
			do_call(a,b)
	#pragma pipper_end


From steve at holdenweb.com  Thu Feb  5 13:48:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 13:48:57 -0500
Subject: Ordered dict by default
In-Reply-To: <80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>	<7a9c25c20902050801w4f2fdb84qdba397589b256318@mail.gmail.com>
	<mailman.8895.1233849922.3487.python-list@python.org>	<onFil.10046$8_3.7722@flpi147.ffdc.sbc.com>
	<80a93535-7662-4911-9abe-49a41d0fafe6@w1g2000prk.googlegroups.com>
Message-ID: <gmfcar$jmh$1@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Bryan Olson:
>> A few bits fuzzy. Is the following True or False if dict is insert-ordered?
>>     dict(a=6, b=7) == dict(b=7, a=6)
> 
> In my odict implementation I have disallowed that syntax because if
> you want to define a mydict(**kwds) function that allows a syntax
> like:
> 
> mydict(a=6, b=7)
> 
> it takes a dict as argument, such dict is currently not ordered. If
> built-in dicts become ordered, then that dict too may become
> ordered :-)
> 
> Anyway, maybe it's good to ignore the inserting order of items when
> you look for odict equality.
> 
But then they wouldn't be equal. As I said right at the start if this
thread:

> one of the prime issues every time
> this comes up is the inability of the various proponents to agree on how
> dicts should actually be ordered.

The remainder of the thread vindicates that comment.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Thu Feb  5 14:02:51 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 20:02:51 +0100
Subject: Python Installation Error
In-Reply-To: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
References: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
Message-ID: <6v0retFhn667U1@mid.uni-berlin.de>

Ahmed Majeed schrieb:
> Hi,
> I am working over a research project and need Python 2.3 or later to
> be installed on my Intel Centrino machine, running Fedora 9 as OS. I
> have downloaded latest stable release Python 2.6.1 from Python.org,
> but when I tried installing it, terminal returned an error on 'make',
> saying:
> 
> "Failed to find the necessory Bits to build these modules:
> _tkinter     bsddb185,     sunaaudiodev
> To find the necessory bits, look in setup.py in detect_modules() for
> the module's name."
> 
> How should I correct this and go ahead for installation. Anxiously
> waiting reply and thanking you in anticiaption.

You are missing tcl/tk and bsddb development packages. Or if you don't 
care about these functionalities, you should be able to disable them 
using configure.

Diez


From toby at tobiah.org  Thu Feb  5 14:06:39 2009
From: toby at tobiah.org (Tobiah)
Date: Thu, 05 Feb 2009 11:06:39 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
Message-ID: <pan.2009.02.05.19.06.25.464020@tobiah.org>


> Hello everybody,
> 
> Any better solution than this?

a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
print str(a).replace('[', '').replace(']', '').split(', ')

;)




From rdmurray at bitdance.com  Thu Feb  5 14:07:15 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 5 Feb 2009 19:07:15 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<873aesbzng.fsf@agentultra.com>
Message-ID: <gmfdd3$ne8$1@ger.gmane.org>

Quoth J Kenneth King <james at agentultra.com>:
> mk <mrkafk at gmail.com> writes:
> 
> > Hello everybody,
> >
> > Any better solution than this?
> >
> > def flatten(x):
> >     res = []
> >     for el in x:
> >         if isinstance(el,list):
> >             res.extend(flatten(el))
> >         else:
> >             res.append(el)
> >     return res
> >
> > a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> > print flatten(a)
> >
> >
> > [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
> >
> > Regards,
> > mk
> 
> http://mail.python.org/pipermail/python-list/2005-July/330367.html

That's worth reading.  I'm not sure why I'm finding this fun, but who
cares.  I tried a couple of other functions after reading that article,
and it looks like a generator that scans the nested lists is actually
the winner, and also is in many ways the most elegant implementation.
Of course, as noted in the emails following above article, the test data
is really inadequate for proper optimization testing ;)

-----------------------------------------------------------------
from __future__ import print_function
from timeit import Timer
from itertools import chain

# This is the one from the article quoted above.
def flatten6(seq):
    i = 0
    while (i != len(seq)):
        while hasattr(seq[i], '__iter__'):
            seq[i:i+1] = seq[i]
        i = i + 1
    return seq


#This is my favorite from a readability standpoint out of
#all the things I tried.  It also performs the best.
def flatten8(seq):
    for x in seq:
        if not hasattr(x, '__iter__'): yield x
        else:
            for y in flatten8(x):
                yield y



l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]



if __name__=="__main__":
    print(l)
    print('flatten6', flatten6(l))
    print('flatten8', list(flatten8(l)))
    print('flatten6', Timer("flatten6(l)", "from temp3 import flatten6, l").timeit())
    print('flatten8', Timer("list(flatten8(l))", "from temp3 import flatten8, l").timeit())


-----------------------------------------------------------------

>src/python/Python-3.0/python temp3.py
[[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten6 32.8386368752
flatten8 30.7509689331

>python temp3.py 
[[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
flatten6 34.730714798
flatten8 32.3252940178

--RDM



From toby at tobiah.org  Thu Feb  5 14:13:20 2009
From: toby at tobiah.org (Tobiah)
Date: Thu, 05 Feb 2009 11:13:20 -0800
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<pan.2009.02.05.19.06.25.464020@tobiah.org>
Message-ID: <pan.2009.02.05.19.13.20.476936@tobiah.org>

On Thu, 05 Feb 2009 11:06:39 -0800, Tobiah wrote:

> 
>> Hello everybody,
>> 
>> Any better solution than this?
> 
> a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]] print str(a).replace('[',
> '').replace(']', '').split(', ')
> 
> ;)

Or:

a = ['text', 'string', 3, [4, 5, 6], [[7, 8], [9, 10]]]
print eval("[" + str(a).replace('[', '').replace(']', '') + "]")

Just tongue in cheek...



From marduk at letterboxes.org  Thu Feb  5 14:30:11 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 05 Feb 2009 14:30:11 -0500
Subject: where clause
In-Reply-To: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
Message-ID: <1233862211.12935.21.camel@localhost.localdomain>

On Thu, 2009-02-05 at 10:04 -0800, bearophileHUGS at lycos.com wrote:
> This comes after a small discussion in another Python newsgroup.
> Haskell supports a where clause, that's syntactic sugar that allows
> you to define things like this:
> 
> p = a / b
>   where
>     a = 20 / len(c)
>     b = foo(d)
> 
> That means:
> 
> a = 20 / len(c)
> b = foo(d)
> p = a / b
> 
> I don't know how much good this syntax can be in my Python programs,
> probably I have to use it some time to judge.
> 
> In the Python shell you usally have to use a bottom-up style of
> programming, while a where may allow you a more top-down too. I can
> enjoy this.
> 

I don't like it for the following reasons:

      * Flat is better than nested.
      * There should be one-- and preferably only one --obvious way to
        do it.

One could imagine this getting "out of hand" e.g.

p = a / b
   where
      a = 20 / len(c)
          where
              c = p / b
      try:
          b = foo(d)
              where
                  d = bar()
      except:
          b = 0


It also begs the question, should the except: clause be written to
handle an exception raised in foo() as well as bar()? or should one also
write a try/except around bar()?

Usually when I'm looking at an identifier (function, class, variable)
being used, I tend to look *up* to see where it is defined.



From andrew.replogle at gmail.com  Thu Feb  5 14:34:29 2009
From: andrew.replogle at gmail.com (Andrew)
Date: Thu, 5 Feb 2009 11:34:29 -0800 (PST)
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
Message-ID: <851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>

On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
> escribi?:
>
>
>
> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> Andrew schrieb:
>
> >> > I'm running into a strange situation with getting incorrect
> >> > returncodes / exit status from python subprocess.call. I'm using a
> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
> >> > java applications to glassfish application server. Below is an example
>
> > I've removed shell=True, unfortunately, if I structure the call like:
>
> > call(["c:/glassfish/bin/asadmin.bat", "list-system-properties", "--
> > host
> > mydomain", "--port 4848", "--user admin", "server-01"])
>
> > It doesn't seem to recognize any arguments after list-system-
> > properties.
>
> Should be:
>
> call(["c:/glassfish/bin/asadmin.bat", "list-system-properties", "--host",
> "mydomain", "--port", "4848", "--user", "admin", "server-01"])
>
> *Every* argument should be an item in the list (your way, "--port 4848" ?
> becomes a single argument, not two: option plus value)
> (This is independent of your other issue)
>
> > If I structure it like:
>
> > call("c:/glassfish/bin/asadmin.bat "+"list-system-properties --host
> > mydomain --port 4848 --user admin server-01")
>
> > Then it executes correctly but still gives invalid returncode of 0
> > when it fails instead of 1.
>
> A similar example works fine for me:
>
> C:\temp>type ret.c
> #include <stdlib.h>
>
> int main(int argc, char* argv[])
> {
> ? ?return atoi(argv[1]);
>
> }
>
> C:\temp>ret 5
>
> C:\temp>echo %errorlevel%
> 5
>
> C:\temp>type testret.bat
> ret %1
>
> C:\temp>testret 3
>
> C:\temp>ret 3
>
> C:\temp>echo %errorlevel%
> 3
>
> C:\temp>type testret.py
> ?from subprocess import call
> ret = call(["testret.bat", "42"])
> print "testret.bat exit code =", ret
>
> C:\temp>python testret.py
>
> C:\temp>ret 42
> testret.bat exit code = 42
>
> C:\temp>python -V
> Python 2.6
>
> C:\temp>ver
>
> Microsoft Windows XP [Versi?n 5.1.2600]
>
> --
> Gabriel Genellina

I've tried this several ways now. It seems to be something specific
with python and asadmin.bat.

I've tried the following manually in the cmd.exe prompt:

------
C:\temp>c:\glassfish\bin\asadmin.bat list-system-properties
Instance-01
....
properties here
....

Command list-system-properties executed successfully.

C:\temp>echo %errorlevel%
0

C:\temp>c:\glassfish\bin\asadmin.bat list-system-properties
Instance-05    //note that Instance-05 does not exist
Cannot determine type for target : Instance-05
CLI137 Command list-system-properties failed.

C:\temp>echo %errorlevel%
1

C:\temp>ping 019293.com
Ping request could not find host 019293.com. Please check the name and
try again
.

C:\temp>echo %errorlevel%
1

C:\temp>ping google.com

Pinging google.com [74.125.45.100] with 32 bytes of data:

Reply from 74.125.45.100: bytes=32 time=48ms TTL=234
Reply from 74.125.45.100: bytes=32 time=66ms TTL=234
Reply from 74.125.45.100: bytes=32 time=63ms TTL=234
Reply from 74.125.45.100: bytes=32 time=44ms TTL=234

Ping statistics for 74.125.45.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 44ms, Maximum = 66ms, Average = 55ms

C:\temp>echo %errorlevel%
0
----------------------------------------

Then I tried the following in python (2.6.1)

---script---
import subprocess
import sys


try:
    retcode = subprocess.call(["ping","019293.com"])
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e

try:
    retcode = subprocess.call(["ping","google.com"])
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e


try:
    retcode = subprocess.call(["c:/glassfish/bin/asadmin.bat","list-
system-properties","Instance-01"], shell=False)
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e

try:
    retcode = subprocess.call(["c:/glassfish/bin/asadmin.bat","list-
system-properties","Instance-05"], shell=False)
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError, e:
    print >>sys.stderr, "Execution failed:", e
---script---

Executed Output:

---output---
C:\temp>c:\Python26\python.exe example2.py
Ping request could not find host 019293.com. Please check the name and
try again.
Child returned 1

Pinging google.com [74.125.67.100] with 32 bytes of data:

Reply from 74.125.67.100: bytes=32 time=244ms TTL=239
Reply from 74.125.67.100: bytes=32 time=244ms TTL=239
Reply from 74.125.67.100: bytes=32 time=191ms TTL=234
Reply from 74.125.67.100: bytes=32 time=59ms TTL=239

Ping statistics for 74.125.67.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 59ms, Maximum = 244ms, Average = 184ms
Child returned 0

...glassfish properties for Instance-01 display here...
Command list-system-properties executed successfully.
Child returned 0

Cannot determine type for target : Instance-05
CLI137 Command list-system-properties failed.
Child returned 0

C:\temp>
---output---

Notice how python never gets the correct returncode from asadmin.bat
but I can get the correct returncode from the shell every time. Can
anyone tell me why Python wouldn't be able to get the correct
returncode for asadmin?

TIA,

Andrew



From bearophileHUGS at lycos.com  Thu Feb  5 14:57:34 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 5 Feb 2009 11:57:34 -0800 (PST)
Subject: where clause
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
	<mailman.8918.1233862206.3487.python-list@python.org>
Message-ID: <2b9a5854-a5bd-4f69-b302-3bcc72c3107b@b38g2000prf.googlegroups.com>

Albert Hopkins:

> One could imagine this getting "out of hand" e.g.

Yes, any syntax can be abused (your example isn't abusive enough).


>       a = 20 / len(c)
>           where
>               c = p / b
>       try:
>           b = foo(d)
>               where
>                   d = bar()
>       except:
>           b = 0
>
> It also begs the question, should the except: clause be written to
> handle an exception raised in foo() as well as bar()? or should one also
> write a try/except around bar()?

This code:

>       a = 20 / len(c)
>           where
>               c = p / b
>       try:
>           b = foo(d)
>               where
>                   d = bar()
>       except:
>           b = 0

Equals to:

a = 20 / len(p / b)
try:
    b = foo(bar())
except:
    b = 0
p = a / b

So the answer is positive.


> Usually when I'm looking at an identifier (function, class, variable)
> being used, I tend to look *up* to see where it is defined.

Right, the main purpose of where is to change that usual way, if you
want.

Note that where may also be designed to create a new scope (as in
Haskell, I think), that's why I have inlined the bar and p/b.

Bye,
bearophile


From clp2 at rebertia.com  Thu Feb  5 15:08:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 12:08:09 -0800
Subject: os.system issues
In-Reply-To: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
References: <BAY104-W50B80665191D809145938CDEC00@phx.gbl>
Message-ID: <50697b2c0902051208w40c7c3f3k39c1d4c4aeb08990@mail.gmail.com>

On Thu, Feb 5, 2009 at 6:00 AM, Youri Lammers
<youri_lammers_88 at hotmail.com> wrote:
> Ok,
>
> I want to run a program called 'muscle' with my python script,
> muscle uses the following command:
> 'muscle.exe -in filename -out filename'
> so far I got:
>
> import os
> args = ['-in filename', '-out filename']

As Christian indirectly points out, that's an incorrect tokenization
of the arguments. Remember that the shell has no knowledge of what
arguments a program takes and so doesn't treat the arguments
differently or specially for each program; it instead applies the
consistent rule of breaking arguments at spaces (unless you put an
argument in quotes). Thus, args should be:

args = ['-in', 'filename', '-out', 'filename']

The fact that the program happens to semantically pair those adjacent
arguments together is entirely up to and done by the program itself.
You can verify this by printing sys.argv from a command-line Python
program which you've given arguments to.

And of course, you'd only use `args` like this if you were using the
`subprocess` module; as others have pointed out, os.system() is more
primitive and just takes a single string of the entire command. But
`subprocess` is better anyway.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From stefan_ml at behnel.de  Thu Feb  5 15:10:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 05 Feb 2009 21:10:10 +0100
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
In-Reply-To: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
References: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
Message-ID: <498b47a2$0$31338$9b4e6d93@newsspool4.arcor-online.net>

Kyle wrote:
> def do_call(x,y):
> 	print "Hello World", x, y, os.getpid()
> 
> if __name__ == '__pipper_main__':
> 	a_range = range( int(sys.argv[1]) )
> 	#pragma pipper_start
> 	for a in  a_range :
> 		for b in a_range :
> 			do_call(a,b)
> 	#pragma pipper_end

I'm not a big fan of comments that change semantics. Wouldn't a modified
'with' statement look better?

We have a couple of other syntax proposals in the Cython Wiki.

http://wiki.cython.org/enhancements/parallel

Stefan


From michele.simionato at gmail.com  Thu Feb  5 15:16:45 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 5 Feb 2009 12:16:45 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
Message-ID: <d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>

On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
> In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
>
>
> >Looks fine to me. In some situations you may also use hasattr(el,
> >'__iter__') instead of isinstance(el, list) (it depends if you want to
> >flatten generic iterables or only lists).
>
> Of course, once you do that, you need to special-case strings...

Strings are iterable but have no __iter__ method, which is fine in
this context, since I would say 99.9% of times one wants to treat them
as atomic objects, so no need to special case.


From benjamin.kaplan at case.edu  Thu Feb  5 15:18:54 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 5 Feb 2009 15:18:54 -0500
Subject: Python Installation Error
In-Reply-To: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
References: <64020629-a27e-45f8-bfd9-1cf61384a548@t26g2000prh.googlegroups.com>
Message-ID: <ec96e1390902051218u57424bb4tb4eab53d5c09de42@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:46 PM, Ahmed Majeed <engr.amkhan at gmail.com> wrote:

> Hi,
> I am working over a research project and need Python 2.3 or later to
> be installed on my Intel Centrino machine, running Fedora 9 as OS. I
> have downloaded latest stable release Python 2.6.1 from Python.org,
> but when I tried installing it, terminal returned an error on 'make',
> saying:
>
> "Failed to find the necessory Bits to build these modules:
> _tkinter     bsddb185,     sunaaudiodev
> To find the necessory bits, look in setup.py in detect_modules() for
> the module's name."
>
> How should I correct this and go ahead for installation. Anxiously
> waiting reply and thanking you in anticiaption.



Are you sure there was an error in make? What you see isn't a problem, it's
just a notification. Make is telling you the tk, bsddb, and sunaaudiodev
modules won't be installed because you don't have the libraries on your
computer. If it got that far, I'm almost certain that the build was
sucessful. Make install should work from there. If you aren't going to use
those modules, go ahead and install it, otherwise download those libraries
and try again.
-------------- next part --------------
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From matzke at berkeley.edu  Thu Feb  5 15:28:13 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 12:28:13 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>
	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
Message-ID: <498B4BDD.701@berkeley.edu>



Scott David Daniels wrote:
> M.-A. Lemburg wrote:
>> On 2009-02-05 10:08, Nick Matzke wrote:
>>> ..., I can run this in the ipython shell just fine:
>>> a = ["12", "15", "16", "38.2"]
>>> dim = int(sqrt(size(a)))
>>> ...But if I move these commands to a function in another file, it 
>>> freaks out:
>> You need to add:
>>
>> from math import sqrt
> or:
>     from cmath import sqrt
> or:
>     from numpy import sqrt





The weird thing is, when I do this, I still get the error:

============
nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
make_half_square_array
nick at mws2[phylocom]|24> d = make_half_square_array(a)
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/bioinformatics/phylocom/<ipython console> in <module>()

/bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
make_half_square_array(linear_version_of_square_array)
    1548         from numpy import sqrt
    1549         a = linear_version_of_square_array
-> 1550         dim = int(sqrt(size(a)))
    1551
    1552

NameError: global name 'sqrt' is not defined
nick at mws2[phylocom]|25>
============

Is there some other place I should put the import command?  I.e.:
1. In the main script/ipython command line

2. In the called function, i.e. make_half_square_array() in 
LR_run_functions_v2.py

3. At the top of LR_run_functions_v2.py, outside of the individual 
functions?

Thanks...sorry for the noob questions!
Nick



> 
> Each with their own, slightly different, meaning.
> Hence the reason many of us prefer to import the module
> and reference the function as a module attribute.
> 
> Note that _many_ (especially older) package documents describe
> their code without the module name.  I believe that such behavior
> is because, when working to produce prose about a package, it
> feels too much like useless redundancy when describing each function
> or class as "package.name".
> 
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From kellrott at gmail.com  Thu Feb  5 15:40:29 2009
From: kellrott at gmail.com (Kyle)
Date: Thu, 5 Feb 2009 12:40:29 -0800 (PST)
Subject: Python Integrated Parallel Pipeline EnviRonment: PIPPER
References: <74164566-8bc4-40d7-b9f0-881ed9a015e5@p2g2000prn.googlegroups.com>
	<498b47a2$0$31338$9b4e6d93@newsspool4.arcor-online.net>
Message-ID: <d87d3ad9-b58a-4259-90d9-9f98142f0f03@p2g2000prf.googlegroups.com>

PIPPER doesn't yet have a very large user base, and is still in
Alpha.  So if there is enough demand, syntax changes would still be
possible at this stage.

Kyle

> I'm not a big fan of comments that change semantics. Wouldn't a modified
> 'with' statement look better?
>
> We have a couple of other syntax proposals in the Cython Wiki.
>
> http://wiki.cython.org/enhancements/parallel
>
> Stefan



From matt.dubins at sympatico.ca  Thu Feb  5 15:40:29 2009
From: matt.dubins at sympatico.ca (inkhorn)
Date: Thu, 5 Feb 2009 12:40:29 -0800 (PST)
Subject: tkSimpleDialog window focus problem
References: <238e1e3c-66aa-45de-9a67-2b91e15bc465@x6g2000pre.googlegroups.com>
Message-ID: <987c2c11-7b16-4df2-97b1-6185010c333f@i18g2000prf.googlegroups.com>

After much tinkering, I figured out the problem.  Before the call to
the ftp.login function, I had another simpledialog asking for a
userid.  The focus was leaving the parent Tk window altogether right
after userid entry.  So, right after the call to obtain the userid
from the user, i called the Frame.focus_force() method.  Observe:

self.userid = tkSimpleDialog.askstring("UTSCID Entry","UTSCID:")
self.focus_force()

Now, the next tkSimpleDialog.askstring call that I made ACTUALLY gets
the keyboard focus automatically.

Cheers,
Matt


On Feb 4, 10:21?am, inkhorn <matt.dub... at sympatico.ca> wrote:
> Hi all,
>
> As part of the program I've created and am maintaining, the user has
> to type in his/her username and password into tkinter simple dialog
> windows. ?What you'll see below is that I've nested an askstring
> dialog window within a call to use the ftp module to login to an FTP
> server.
>
> result = self.ftp.login(self.userid, tkSimpleDialog.askstring
> ("Password Entry",
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "Password:", show="*"))
>
> Annoyingly, every time this password entry window pops up, the focus
> does not go on it automatically. ?Anyone know what I can do to put the
> focus on it automatically, while *not* storing the user's password in
> my script for the remainder of its runtime?
>
> Thanks,
> Matt Dubins



From python-url at phaseit.net  Thu Feb  5 15:50:07 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 5 Feb 2009 20:50:07 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb  5)
Message-ID: <gmfjdv$jg8$1@lairds.us>

QOTW:  "Findability trumps usability. If you can't find it, you can't use
it." - information architect Robert Morville
    
    
    Boolean expressions don't necesarily yield a boolean type - and that's
    very useful:
        http://groups.google.com/group/comp.lang.python/t/e834202d1a6a919/
    
    Using __del__ is rather fragile:
        http://groups.google.com/group/comp.lang.python/t/c1e7fccbfd7e5e73/
        http://groups.google.com/group/comp.lang.python/t/25d36f0a74245bc4/
    
    Good or bad usage of __repr__?
        http://groups.google.com/group/comp.lang.python/t/d7e2b1637db02f2a/
    
    Which OOP concepts apply to the Python language? A long thread, at the
    end mostly focused on access restrictions:
        http://groups.google.com/group/comp.lang.python/t/abf06e897aacc3d9/
    
    A class implementing an iterator, and how the iterator protocol works:
        http://groups.google.com/group/comp.lang.python/t/edaa3cc79a0581ea/
    
    Computing the n-th root of big numbers:
        http://groups.google.com/group/comp.lang.python/t/7eb4facfe4b0ffa1/
    
    A list that knows when any of its elements is modified:
        http://groups.google.com/group/comp.lang.python/t/4b7f993274ece50d/
    
    Embedding 2.6.1 in Windows doesn't work due to missing C runtime
    libraries:
        http://groups.google.com/group/comp.lang.python/t/3ec6af1279a162ca/
    
    How to call Python code from another thread written in C:
        http://groups.google.com/group/comp.lang.python/t/1d05f3f215346249/
    
    How SQLAlchemy compares to similar ORMs:
        http://groups.google.com/group/comp.lang.python/t/547d0a7c0477293c/
    
    

    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From rNOSPAMon at flownet.com  Thu Feb  5 15:52:42 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 05 Feb 2009 12:52:42 -0800
Subject: WebError documentation?
Message-ID: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>

Is there any?  Where is it?  Extensive Googling has proven fruitless.

Thanks,
rg


From deets at nospam.web.de  Thu Feb  5 15:57:52 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 05 Feb 2009 21:57:52 +0100
Subject: global name 'sqrt' is not defined
In-Reply-To: <mailman.8921.1233865754.3487.python-list@python.org>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
	<mailman.8921.1233865754.3487.python-list@python.org>
Message-ID: <6v126hFhj1beU1@mid.uni-berlin.de>

Nick Matzke schrieb:
> 
> 
> Scott David Daniels wrote:
>> M.-A. Lemburg wrote:
>>> On 2009-02-05 10:08, Nick Matzke wrote:
>>>> ..., I can run this in the ipython shell just fine:
>>>> a = ["12", "15", "16", "38.2"]
>>>> dim = int(sqrt(size(a)))
>>>> ...But if I move these commands to a function in another file, it 
>>>> freaks out:
>>> You need to add:
>>>
>>> from math import sqrt
>> or:
>>     from cmath import sqrt
>> or:
>>     from numpy import sqrt
> 
> 
> 
> 
> 
> The weird thing is, when I do this, I still get the error:
> 
> ============
> nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
> nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
> make_half_square_array
> nick at mws2[phylocom]|24> d = make_half_square_array(a)
> ---------------------------------------------------------------------------
> NameError                                 Traceback (most recent call last)
> 
> /bioinformatics/phylocom/<ipython console> in <module>()
> 
> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
> make_half_square_array(linear_version_of_square_array)
>    1548         from numpy import sqrt
>    1549         a = linear_version_of_square_array
> -> 1550         dim = int(sqrt(size(a)))
>    1551
>    1552
> 
> NameError: global name 'sqrt' is not defined
> nick at mws2[phylocom]|25>
> ============
> 
> Is there some other place I should put the import command?  I.e.:
> 1. In the main script/ipython command line
> 
> 2. In the called function, i.e. make_half_square_array() in 
> LR_run_functions_v2.py
> 
> 3. At the top of LR_run_functions_v2.py, outside of the individual 
> functions?

The latter. Python's imports are always local to the module/file they 
are in, not globally effective.


Diez


From http  Thu Feb  5 16:27:46 2009
From: http (Paul Rubin)
Date: 05 Feb 2009 13:27:46 -0800
Subject: where clause
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
	<mailman.8918.1233862206.3487.python-list@python.org>
	<2b9a5854-a5bd-4f69-b302-3bcc72c3107b@b38g2000prf.googlegroups.com>
Message-ID: <7x7i44poa5.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> Note that where may also be designed to create a new scope (as in
> Haskell, I think), that's why I have inlined the bar and p/b.

In Haskell, "where" is only allowed at the outermost level of a
function definition (including a nested one), not in an arbitrary
expression.


From sluggoster at gmail.com  Thu Feb  5 16:37:48 2009
From: sluggoster at gmail.com (Mike Orr)
Date: Thu, 5 Feb 2009 13:37:48 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8548.1233532052.3487.python-list@python.org>
Message-ID: <8491d636-4084-4baf-8cc8-af2f800fd361@s9g2000prg.googlegroups.com>

On Feb 1, 3:47?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> Googling, I found SQLalchemy,
> which looks quit good.
> SQLAlchemy is very good. I'm very slowly migrating our entire codebase to it.
> ?
>
>
> But as I only want to choose once,
> I googled for ?"SQLalchemy alternatives",
> but it didn't find many answers.
> (Storm / Grok are of no interest, because manipulating the structure of the database is a key issue).
> There's a few other alternatives-- if you google "Python ORM" you'll find a lot more, and PyPi might have a list. But IMHO, SQLAlchemy is the best of breed so far. Its very, very flexible and doesn't really impose on you with any rules about how you must do things.
> Storm's not bad, don't get me wrong!
> But one question on your requirements: manipulating the structure of the database. How so? If you mean that you want to be able to modify the object wrapper to change some field of a table and have that change propagated to the database layer... then SQLAlchemy doesn't support that. If you add new tables it'll create them, and it MIGHT add new columns or indexes if you add them after and it notices they aren't there... but I'm not entirely sure on that.

engine.execute("ALTER TABLE ...")

However, this may confuse ORM objects already in memory as well as
transactions, so clear these out both before and afterward.  The
syntax is database specific.  MySQL can add and delete columns and
change a column's type.  SQLite can only rename tables.  However, your
ORM objects won't know about the new columns unless you reinitialize
the Table objects and mapper with autoloading.  So it's best to modify
the schema in a standalone program that does not use the ORM.

As for modifying the columns in the Table objects and propagating the
changes to the database, you can't do that.  You have to execute
"ALTER TABLE" as a string command.  SQLAlchemy would have to add a
whole new layer to deal with alternations at the Table or SQL builder
level, and in the end they're still database specific.




From gandalf at shopzeus.com  Thu Feb  5 16:42:26 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Thu, 05 Feb 2009 22:42:26 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <gmc9ot$ops$1@online.de>
References: <mailman.8719.1233689579.3487.python-list@python.org>
	<gmc9ot$ops$1@online.de>
Message-ID: <498B5D42.6080408@shopzeus.com>

Uwe Grauer ?rta:
> Laszlo Nagy wrote:
>   
>> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
>> FireBird 1.5?
>>
>> My problem:
>>
>>    * python 2.6 already installed on a server
>>    * there is a firebird 1.5 database on the same server
>>    * I need to access it from python 2.6
>>
>> Any thoughts?
>>
>>
>>     
>
> Get it from here:
> http://www.firebirdsql.org/index.php?op=devel&sub=python
>   
Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can 
only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going 
to downgrade. :-(



From btaylordesign at gmail.com  Thu Feb  5 16:47:09 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 5 Feb 2009 13:47:09 -0800 (PST)
Subject: Extracting file from zip archive in Python 2.6.1
References: <7676f73d-2ee9-4151-8a09-b11a3eea2045@p37g2000yqd.googlegroups.com>
	<mailman.8695.1233675948.3487.python-list@python.org>
	<4d2b4207-e14a-4b4d-b518-1b7eb6322ce5@n33g2000pri.googlegroups.com>
	<e06ad9bc-7a7a-43f8-a0ac-1b443998d4e8@l39g2000yqn.googlegroups.com> 
	<mailman.8757.1233728172.3487.python-list@python.org>
Message-ID: <e017ada1-50e3-4795-a516-f70f2d8e3325@s1g2000prg.googlegroups.com>

On Feb 4, 12:16?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 04 Feb 2009 00:36:40 -0200, Brandon Taylor ?
> <btaylordes... at gmail.com> escribi?:
>
>
>
> > On Feb 3, 1:16?pm, Brandon Taylor <btaylordes... at gmail.com> wrote:
> >> On Feb 3, 9:45?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> >> > En Tue, 03 Feb 2009 05:31:24 -0200, Brandon Taylor ?
> >> > <btaylordes... at gmail.com> escribi?:
> >> > > zip_file.extract(zip_name + '/' + thumbnail_image, thumbnail_path)
> >> > > What is happening is that the extract method is creating a folder > ?
> >> > with
> >> > > the name of 'zip_name' and extracting the files to it. Example:
> >> > extract will create all directories in member name. Use open instead:
> >> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> >> > ? ?with open(os.path.join(thumbnail_path, thumbnail_image), "wb") as ?
> >> > target:
> >> > ? ? ?shutil.copyfileobj(source, target)
> > Ok, the first thing I needed to do was add:
>
> > from __future__ import with_statement at the beginning of my file
>
> That should not be necesary with your Python version (2.6.1 isn't it?)
>
> > with zip_file.open(zip_name + '/' + thumbnail_image) as source:
> > ? ? ? ? ? ? ? ? ? ? with open(os.path.join(thumbnail_path,
> > thumbnail_image), 'wb') as target:
> > ? ? ? ? ? ? ? ? ? ? ? ? shutil.copyfileobj(source, target)
>
> > Returns an error on the first line:
>
> > ZipExtFile instance has no attribute '__exit__'
>
> Ouch, sorry, this new feature will appear in the not-yet-released 2.7 ?
> version...
> Try this instead:
>
> source = zip_file.open(zip_name + '/' + thumbnail_image)
> try:
> ? ?with open(os.path.join(thumbnail_path, thumbnail_image), 'wb') as target:
> ? ? ?shutil.copyfileobj(source, target)
> finally:
> ? ?source.close()
>
> --
> Gabriel Genellina

Awesome. Works perfectly, and saves me the extra step of having to
move the files.

Many, many thanks!

Kind regards,
Brandon


From tjreedy at udel.edu  Thu Feb  5 17:09:16 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:09:16 -0500
Subject: Ordered dict by default
In-Reply-To: <7x7i45qiyo.fsf@ruckus.brouhaha.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<7x7i45qiyo.fsf@ruckus.brouhaha.com>
Message-ID: <gmfo27$t5d$4@ger.gmane.org>

Paul Rubin wrote:
> bearophileHUGS at lycos.com writes:
>> Now Ruby dicts are ordered by default:
>> http://www.igvita.com/2009/02/04/ruby-19-internals-ordered-hash/
> 
> Maybe I didn't read that carefully enough, but it looks like "ordered"
> means the dict records come out in the same order you inserted them
> in.  That is if you insert B,A,D,C in that order, you get them out in
> that order.

This seems to have become the more common meaning of 'ordered dict'.

>  I would have thought an ordered dict meant you get A,B,C,D,
> which seems a lot more useful.

I once thought that too, but this would be a 'sorted dict'.

tjr



From tjreedy at udel.edu  Thu Feb  5 17:11:30 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:11:30 -0500
Subject: Ordered dict by default
In-Reply-To: <6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
References: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
	<6e4959e8-b5e2-43da-9199-8bd0d2499e03@i18g2000prf.googlegroups.com>
Message-ID: <gmfo6d$t5d$5@ger.gmane.org>

andrew cooke wrote:
> so what is happening with pep 372?
> 
> http://www.python.org/dev/peps/pep-0372/

There seems to be a number of unanswered questions as to the exact 
behavior (see Q and A section).  The author needs to promote more 
discussion by those interested, including here, and make a decision.



From tjreedy at udel.edu  Thu Feb  5 17:20:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 17:20:06 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <gmf2e5$9b3$1@ger.gmane.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
Message-ID: <gmfomg$t5d$6@ger.gmane.org>

mk wrote:
> 
> (duck)
> 
> 542 comp.lang.python rtfm

What is so unfriendly about 'read the fine manual'?



From lionel.keene at gmail.com  Thu Feb  5 17:22:35 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:22:35 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
Message-ID: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>

Hello,
I have data stored in binary files. Some of these files are
huge...upwards of 2 gigs or more. They consist of 32-bit float complex
numbers where the first 32 bits of the file is the real component, the
second 32bits is the imaginary, the 3rd 32-bits is the real component
of the second number, etc.

I'd like to be able to read in just the real components, load them
into a numpy.ndarray, then load the imaginary coponents and load them
into a numpy.ndarray.  I need the real and imaginary components stored
in seperate arrays, they cannot be in a single array of complex
numbers except for temporarily. I'm trying to avoid temporary storage,
though, because of the size of the files.

I'm currently reading the file scanline-by-scanline to extract rows of
complex numbers which I then loop over and load into the real/
imaginary arrays as follows:


        self._realData         = numpy.empty((Rows, Columns), dtype =
numpy.float32)
        self._imaginaryData = numpy.empty((Rows, Columns), dtype =
numpy.float32)

        floatData = array.array('f')

        for CurrentRow in range(Rows):

            floatData.fromfile(DataFH, (Columns*2))

            position = 0
            for CurrentColumn in range(Columns):

                 self._realData[CurrentRow, CurrentColumn]          =
floatData[position]
                self._imaginaryData[CurrentRow, CurrentColumn]  =
floatData[position+1]
                position = position + 2


The above code works but is much too slow. If I comment out the body
of the "for CurrentColumn in range(Columns)" loop, the performance is
perfectly adequate i.e. function call overhead associated with the
"fromfile(...)" call is not very bad at all. What seems to be most
time-consuming are the simple assignment statements in the
"CurrentColumn" for-loop.

Does anyone see any ways of speeding this up at all? Reading
everything into a complex64 ndarray in one fell swoop would certainly
be easier and faster, but at some point I'll need to split this array
into two parts (real / imaginary). I'd like to have that done
initially to keep the memory usage down since the files are so
ginormous.

Psyco is out because I need 64-bits, and I didn't see anything on the
forums regarding a method that reads in every other 32-bit chunk form
a file into an array. I'm not sure what else to try.

Thanks in advance.
L


From mensanator at aol.com  Thu Feb  5 17:29:50 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 5 Feb 2009 14:29:50 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8926.1233872413.3487.python-list@python.org>
Message-ID: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>

On Feb 5, 4:20?pm, Terry Reedy <tjre... at udel.edu> wrote:
> mk wrote:
>
> > (duck)
>
> > 542 comp.lang.python rtfm
>
> What is so unfriendly about 'read the fine manual'?

You've seen a fine manual?


From benjamin.kaplan at case.edu  Thu Feb  5 17:30:51 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 5 Feb 2009 17:30:51 -0500
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <498B5D42.6080408@shopzeus.com>
References: <mailman.8719.1233689579.3487.python-list@python.org>
	<gmc9ot$ops$1@online.de> <498B5D42.6080408@shopzeus.com>
Message-ID: <ec96e1390902051430g65fa618at80d34ff9c7427f1d@mail.gmail.com>

On Thu, Feb 5, 2009 at 4:42 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:

> Uwe Grauer ?rta:
>
>> Laszlo Nagy wrote:
>>
>>
>>> Does anyone know how to get firebird 1.5 driver (kinterbasdb) for
>>> FireBird 1.5?
>>>
>>> My problem:
>>>
>>>   * python 2.6 already installed on a server
>>>   * there is a firebird 1.5 database on the same server
>>>   * I need to access it from python 2.6
>>>
>>> Any thoughts?
>>>
>>>
>>>
>>>
>>
>> Get it from here:
>> http://www.firebirdsql.org/index.php?op=devel&sub=python
>>
>>
> Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can
> only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going to
> downgrade. :-(
>

The prebuilt binaries don't support Firebird 1.5. The installation guide
says that you can compile it from source to get 1.5 support.


>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From travis+ml-python at subspacefield.org  Thu Feb  5 17:40:36 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 5 Feb 2009 16:40:36 -0600
Subject: updating nntplib
Message-ID: <20090205224036.GH29170@subspacefield.org>

Hello all,

There are some notable deficiencies in nntlib.  Here are two:

1) It says it implements NNTP as defined in RFC 977, but NNTP
has a newer RFC, RFC 3977, which clarifies some vagueness and
has more commands defined.  However, as it currently stands you
cannot issue these commands, since they aren't available to
call.

2) In some cases, it will bomb out upon receiving certain greetings
that it doesn't expect.  As I understand it, it actually terminates
the connection, not allowing for catching an exception or anything.
I have not verified this myself.

I'd like to remedy these deficiencies.  In the case of #1, I'd
like to implement some of the new commands and provide a way to
send arbitrary commands to the server, because NNTP is designed
to allow servers to implement optional features.

I'm not sure how I'll remedy #2, but I imagine it will be clear
once I examine the code.

I am guessing that this is the right list for discussing this,
but perhaps python-dev is better.  Anyone have feedback?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From lionel.keene at gmail.com  Thu Feb  5 17:40:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:40:49 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
Message-ID: <44dc0091-1ea2-4636-952f-ee3ab4f33223@g1g2000pra.googlegroups.com>

On Feb 5, 2:22?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hello,
> I have data stored in binary files. Some of these files are
> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> numbers where the first 32 bits of the file is the real component, the
> second 32bits is the imaginary, the 3rd 32-bits is the real component
> of the second number, etc.
>
> I'd like to be able to read in just the real components, load them
> into a numpy.ndarray, then load the imaginary coponents and load them
> into a numpy.ndarray. ?I need the real and imaginary components stored
> in seperate arrays, they cannot be in a single array of complex
> numbers except for temporarily. I'm trying to avoid temporary storage,
> though, because of the size of the files.
>
> I'm currently reading the file scanline-by-scanline to extract rows of
> complex numbers which I then loop over and load into the real/
> imaginary arrays as follows:
>
> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> numpy.float32)
> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> numpy.float32)
>
> ? ? ? ? floatData = array.array('f')
>
> ? ? ? ? for CurrentRow in range(Rows):
>
> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
>
> ? ? ? ? ? ? position = 0
> ? ? ? ? ? ? for CurrentColumn in range(Columns):
>
> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> floatData[position]
> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> floatData[position+1]
> ? ? ? ? ? ? ? ? position = position + 2
>
> The above code works but is much too slow. If I comment out the body
> of the "for CurrentColumn in range(Columns)" loop, the performance is
> perfectly adequate i.e. function call overhead associated with the
> "fromfile(...)" call is not very bad at all. What seems to be most
> time-consuming are the simple assignment statements in the
> "CurrentColumn" for-loop.
>
> Does anyone see any ways of speeding this up at all? Reading
> everything into a complex64 ndarray in one fell swoop would certainly
> be easier and faster, but at some point I'll need to split this array
> into two parts (real / imaginary). I'd like to have that done
> initially to keep the memory usage down since the files are so
> ginormous.
>
> Psyco is out because I need 64-bits, and I didn't see anything on the
> forums regarding a method that reads in every other 32-bit chunk form
> a file into an array. I'm not sure what else to try.
>
> Thanks in advance.
> L

Hmmm...I've just discovered "weave.inline()". Maybe I'll just do the
assignments in C.

Still soliciting advice, of course. :-)


From david at boddie.org.uk  Thu Feb  5 17:45:12 2009
From: david at boddie.org.uk (David Boddie)
Date: Thu, 05 Feb 2009 23:45:12 +0100
Subject: HOWTO for setting up a PyQt project in Eclipse ?
References: <mailman.8907.1233854493.3487.python-list@python.org>
Message-ID: <gmfq5o$1ps$1@get-news01.get.basefarm.net>

On Thursday 05 February 2009 18:13, Linuxguy123 wrote:

> Does anyone know of a HOWTO for setting up a PyQt project in Eclipse ?
> 
> I know about setting up a PyDev project, just wondering how to integrate
> the QtDesigner parts.
> 
> For example, should I save the QtDesigner project in the root PyDev
> directory ?

I'm not an Eclipse user, but I recently noticed that the Python(x,y)
project uses (or at least refers to) both PyQt and PyDev. Maybe there's
some useful information, or useful starting points, on these pages:

  http://pythonxy.com/help.php
  http://pythonxy.com/discussions.php

David


From steve at holdenweb.com  Thu Feb  5 17:46:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 17:46:19 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <gmfq7t$77u$1@ger.gmane.org>

Mensanator wrote:
> On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>>> (duck)
>>> 542 comp.lang.python rtfm
>> What is so unfriendly about 'read the fine manual'?
> 
> You've seen a fine manual?

Yes, and I'm fine well sure this is somewhere between a silly thread and
a troll.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb  5 17:48:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 05 Feb 2009 22:48:49 +0000
Subject: Skipping bytes while reading a binary file?
In-Reply-To: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
Message-ID: <498B6CD1.30700@mrabarnett.plus.com>

Lionel wrote:
 > Hello,
 > I have data stored in binary files. Some of these files are
 > huge...upwards of 2 gigs or more. They consist of 32-bit float complex
 > numbers where the first 32 bits of the file is the real component, the
 > second 32bits is the imaginary, the 3rd 32-bits is the real component
 > of the second number, etc.
 >
 > I'd like to be able to read in just the real components, load them
 > into a numpy.ndarray, then load the imaginary coponents and load them
 > into a numpy.ndarray.  I need the real and imaginary components stored
 > in seperate arrays, they cannot be in a single array of complex
 > numbers except for temporarily. I'm trying to avoid temporary storage,
 > though, because of the size of the files.
 >
 > I'm currently reading the file scanline-by-scanline to extract rows of
 > complex numbers which I then loop over and load into the real/
 > imaginary arrays as follows:
 >
 >
 >         self._realData         = numpy.empty((Rows, Columns), dtype =
 > numpy.float32)
 >         self._imaginaryData = numpy.empty((Rows, Columns), dtype =
 > numpy.float32)
 >
 >         floatData = array.array('f')
 >
 >         for CurrentRow in range(Rows):
 >
 >             floatData.fromfile(DataFH, (Columns*2))
 >
 >             position = 0
 >             for CurrentColumn in range(Columns):
 >
 >                  self._realData[CurrentRow, CurrentColumn]          =
 > floatData[position]
 >                 self._imaginaryData[CurrentRow, CurrentColumn]  =
 > floatData[position+1]
 >                 position = position + 2
 >
 >
 > The above code works but is much too slow. If I comment out the body
 > of the "for CurrentColumn in range(Columns)" loop, the performance is
 > perfectly adequate i.e. function call overhead associated with the
 > "fromfile(...)" call is not very bad at all. What seems to be most
 > time-consuming are the simple assignment statements in the
 > "CurrentColumn" for-loop.
 >
[snip]
Try array slicing. floatData[0::2] will return the real parts and
floatData[1::2] will return the imaginary parts. You'll have to read up 
how to assign to a slice of the numpy array (it might be 
"self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow, 
:] = real_parts").

BTW, it's not the function call overhead of fromfile() which takes the
time, but actually reading data from the file.



From lionel.keene at gmail.com  Thu Feb  5 17:56:28 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 14:56:28 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
Message-ID: <695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>

On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Lionel wrote:
>
> ?> Hello,
> ?> I have data stored in binary files. Some of these files are
> ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> ?> numbers where the first 32 bits of the file is the real component, the
> ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> ?> of the second number, etc.
> ?>
> ?> I'd like to be able to read in just the real components, load them
> ?> into a numpy.ndarray, then load the imaginary coponents and load them
> ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> ?> in seperate arrays, they cannot be in a single array of complex
> ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> ?> though, because of the size of the files.
> ?>
> ?> I'm currently reading the file scanline-by-scanline to extract rows of
> ?> complex numbers which I then loop over and load into the real/
> ?> imaginary arrays as follows:
> ?>
> ?>
> ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> ?> numpy.float32)
> ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> ?> numpy.float32)
> ?>
> ?> ? ? ? ? floatData = array.array('f')
> ?>
> ?> ? ? ? ? for CurrentRow in range(Rows):
> ?>
> ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> ?>
> ?> ? ? ? ? ? ? position = 0
> ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> ?>
> ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> ?> floatData[position]
> ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> ?> floatData[position+1]
> ?> ? ? ? ? ? ? ? ? position = position + 2
> ?>
> ?>
> ?> The above code works but is much too slow. If I comment out the body
> ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> ?> perfectly adequate i.e. function call overhead associated with the
> ?> "fromfile(...)" call is not very bad at all. What seems to be most
> ?> time-consuming are the simple assignment statements in the
> ?> "CurrentColumn" for-loop.
> ?>
> [snip]
> Try array slicing. floatData[0::2] will return the real parts and
> floatData[1::2] will return the imaginary parts. You'll have to read up
> how to assign to a slice of the numpy array (it might be
> "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> :] = real_parts").
>
> BTW, it's not the function call overhead of fromfile() which takes the
> time, but actually reading data from the file.

Very nice! I like that! I'll post the improvement (if any).

L


From prologic at shortcircuit.net.au  Thu Feb  5 18:16:47 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 09:16:47 +1000
Subject: Is the subprocess module robust enough in 2.4?
In-Reply-To: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>
References: <20090205162059.CC9A8DB5569@montanaro.dyndns.org>
Message-ID: <e1a84d570902051516i69a3b2b7uea919df7efe46413@mail.gmail.com>

On Fri, Feb 6, 2009 at 2:20 AM,  <skip at pobox.com> wrote:
> The subprocess module was added in Python 2.4.  I'm running 2.4.5 at work.
> I know it's seen many bugfixes since first released.  Is the version in 2.4
> robust enough to use in preference to os.popen and friends?

"Is xxx rubust enough" is an untangible question.
What you really -should- be doing is looking at the
bug reports (as you've mentioned) and determine whether
or not they will affect your use-case(s) in any way.

cheers
James


From aahz at pythoncraft.com  Thu Feb  5 18:27:46 2009
From: aahz at pythoncraft.com (Aahz)
Date: 5 Feb 2009 15:27:46 -0800
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
Message-ID: <gmfsli$dgd$1@panix3.panix.com>

In article <6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
andrew cooke  <andrew at acooke.org> wrote:
>On Feb 1, 8:45=A0pm, a... at pythoncraft.com (Aahz) wrote:
>>
>> [...]=A0I for one won't participate in any list hosted on
>> Google because of the need for a Google login.
>
>hi,  just fyi, i investigated this and you can join any publicly
>readable group by sending an email to the "-subscribe" address.  you
>do not need a google login for this and, as far as i can tell, it then
>operates for you like a normal mailing list.
>
>for example, to subscribe to the group foo, you would send an email to
>foo-subscribe at googlegroups.com.  to unsubscribe, use foo-
>unsubscribe at googlegroups.com.
>
>this isn't exactly well-publicised, but i tested it and it does work.

The same thing is theoretically true for Yahoo groups, but I've heard
from people over the years about various difficulties fixing problems
with list subscriptions in the absence of a real Yahoo login and I'm not
particularly interested in finding out that the same thing ends up being
true for Google lists.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From lionel.keene at gmail.com  Thu Feb  5 18:35:22 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 15:35:22 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
Message-ID: <4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com>

On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
>
>
>
>
> > Lionel wrote:
>
> > ?> Hello,
> > ?> I have data stored in binary files. Some of these files are
> > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > ?> numbers where the first 32 bits of the file is the real component, the
> > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > ?> of the second number, etc.
> > ?>
> > ?> I'd like to be able to read in just the real components, load them
> > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > ?> in seperate arrays, they cannot be in a single array of complex
> > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > ?> though, because of the size of the files.
> > ?>
> > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > ?> complex numbers which I then loop over and load into the real/
> > ?> imaginary arrays as follows:
> > ?>
> > ?>
> > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > ?> numpy.float32)
> > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > ?> numpy.float32)
> > ?>
> > ?> ? ? ? ? floatData = array.array('f')
> > ?>
> > ?> ? ? ? ? for CurrentRow in range(Rows):
> > ?>
> > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > ?>
> > ?> ? ? ? ? ? ? position = 0
> > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > ?>
> > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > ?> floatData[position]
> > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > ?> floatData[position+1]
> > ?> ? ? ? ? ? ? ? ? position = position + 2
> > ?>
> > ?>
> > ?> The above code works but is much too slow. If I comment out the body
> > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > ?> perfectly adequate i.e. function call overhead associated with the
> > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > ?> time-consuming are the simple assignment statements in the
> > ?> "CurrentColumn" for-loop.
> > ?>
> > [snip]
> > Try array slicing. floatData[0::2] will return the real parts and
> > floatData[1::2] will return the imaginary parts. You'll have to read up
> > how to assign to a slice of the numpy array (it might be
> > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > :] = real_parts").
>
> > BTW, it's not the function call overhead of fromfile() which takes the
> > time, but actually reading data from the file.
>
> Very nice! I like that! I'll post the improvement (if any).
>
> L- Hide quoted text -
>
> - Show quoted text -


Okay, the following:

            self._realData[CurrentRow]      = floatData[0::2]
            self._imaginaryData[CurrentRow] = floatData[1::2]

gives a 3.5x improvement in execution speed over the original that I
posted. That's much better. Thank you for the suggestion.

L


From travis+ml-python at subspacefield.org  Thu Feb  5 18:38:26 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 5 Feb 2009 17:38:26 -0600
Subject: updating nntplib
In-Reply-To: <20090205224036.GH29170@subspacefield.org>
References: <20090205224036.GH29170@subspacefield.org>
Message-ID: <20090205233826.GI29170@subspacefield.org>

On Thu, Feb 05, 2009 at 04:40:36PM -0600, Travis wrote:
> 2) In some cases, it will bomb out upon receiving certain greetings
> that it doesn't expect.  As I understand it, it actually terminates
> the connection, not allowing for catching an exception or anything.
> I have not verified this myself.

I just verified this; if the server responds to authentication with
the string "200 Welcome feeder", then nntplib bombs out with a:

nntplib.NNTPPermanentError

IMHO, it shouldn't be sensitive to anything but the numeric code,
and 200 indicates success.
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From bthate at gmail.com  Thu Feb  5 18:50:50 2009
From: bthate at gmail.com (Bart Thate)
Date: Thu, 5 Feb 2009 15:50:50 -0800 (PST)
Subject: GOZERBOT 0.9 RELEASED
Message-ID: <4128ec68-e489-4236-8930-45a196244e3c@p36g2000prp.googlegroups.com>

Finally gozerbot 0.9 has been released.  This is a huge step forward
to version 1.0 and contains a number of changes:

    * use json as the format to save data in instead of pickles
    * let config files also use json, this makes them more readable
and human editable
    * remove popen usage from the bot core
    * remove execfile() calls from the bot core
    * rewrite the gozerbot package into several subpackages
    * use sqlaclhemy to provide database backend (sqlite3 is default)
    * require python2.5
    * move most of the plugins into their own package
    * restructure the gozerdata layout so its more readable

All these changes makes upgrading from older versions of gozerbot
necessary so a gozerbot-upgrade program is provided (upgrading from
0.7 is not supported yet, will follow soon).

See http://gozerbot.org on how to install gozerbot 0.9

About GOZERBOT:

0.9 Requirements

    * a shell
    * python 2.5 or higher
    * gnupg
    * simplejson
    * sqlalchemy
    * xmpppy

Why gozerbot?

    * provide both IRC and Jabber support
    * user management by userhost .. bot will not respond if it
doesn't know you (see USER)
    * fleet .. use more than one bot in a program (list of bots) (see
FLEET)
    * use the bot through dcc chat
    * fetch rss feeds (see RSS)
    * remember items
    * relaying between bots (see RELAY)
    * program your own plugins (see PROGRAMPLUGIN)
    * query other bots with json REST (see CLOUD)
    * serve as a udp <-> irc or jabber notification bot (see UDP
    * sqlalchemy support

Bart


From lionel.keene at gmail.com  Thu Feb  5 18:51:07 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 5 Feb 2009 15:51:07 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com>
Message-ID: <471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>

On Feb 5, 3:35?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > > Lionel wrote:
>
> > > ?> Hello,
> > > ?> I have data stored in binary files. Some of these files are
> > > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > > ?> numbers where the first 32 bits of the file is the real component, the
> > > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > > ?> of the second number, etc.
> > > ?>
> > > ?> I'd like to be able to read in just the real components, load them
> > > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > > ?> in seperate arrays, they cannot be in a single array of complex
> > > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > > ?> though, because of the size of the files.
> > > ?>
> > > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > > ?> complex numbers which I then loop over and load into the real/
> > > ?> imaginary arrays as follows:
> > > ?>
> > > ?>
> > > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > > ?> numpy.float32)
> > > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > > ?> numpy.float32)
> > > ?>
> > > ?> ? ? ? ? floatData = array.array('f')
> > > ?>
> > > ?> ? ? ? ? for CurrentRow in range(Rows):
> > > ?>
> > > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > > ?>
> > > ?> ? ? ? ? ? ? position = 0
> > > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > > ?>
> > > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > > ?> floatData[position]
> > > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > > ?> floatData[position+1]
> > > ?> ? ? ? ? ? ? ? ? position = position + 2
> > > ?>
> > > ?>
> > > ?> The above code works but is much too slow. If I comment out the body
> > > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > > ?> perfectly adequate i.e. function call overhead associated with the
> > > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > > ?> time-consuming are the simple assignment statements in the
> > > ?> "CurrentColumn" for-loop.
> > > ?>
> > > [snip]
> > > Try array slicing. floatData[0::2] will return the real parts and
> > > floatData[1::2] will return the imaginary parts. You'll have to read up
> > > how to assign to a slice of the numpy array (it might be
> > > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > > :] = real_parts").
>
> > > BTW, it's not the function call overhead of fromfile() which takes the
> > > time, but actually reading data from the file.
>
> > Very nice! I like that! I'll post the improvement (if any).
>
> > L- Hide quoted text -
>
> > - Show quoted text -
>
> Okay, the following:
>
> ? ? ? ? ? ? self._realData[CurrentRow] ? ? ?= floatData[0::2]
> ? ? ? ? ? ? self._imaginaryData[CurrentRow] = floatData[1::2]
>
> gives a 3.5x improvement in execution speed over the original that I
> posted. That's much better. Thank you for the suggestion.
>
> L- Hide quoted text -
>
> - Show quoted text -

Correction: improvement is around 7-8x.


From tjreedy at udel.edu  Thu Feb  5 19:07:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 05 Feb 2009 19:07:02 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <gmfuv0$ln4$1@ger.gmane.org>

Mensanator wrote:
> On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>>> (duck)
>>> 542 comp.lang.python rtfm
>> What is so unfriendly about 'read the fine manual'?
> 
> You've seen a fine manual?

Yes, and I and others have spent hours and hours making the Python 
manuals finer.



From orlenko at gmail.com  Thu Feb  5 19:37:18 2009
From: orlenko at gmail.com (Volodya)
Date: Thu, 5 Feb 2009 16:37:18 -0800 (PST)
Subject: Using multiprocessing from a Windows service
Message-ID: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>

Hi all,

I think I've found a small bug with multiprocessing package on
Windows. If you try to start a multiprocessing.Process from a Python-
based Windows service, the child process will fail to run. When
running the parent process as a regular Python program, everything
works as expected.

I've tracked the problem down to how main_path is prepared in
multiprocessing.forking.get_preparation_data() (lines 370-377):

def get_preparation_data(name):
    [...skipped a few lines...]
    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            d['main_path'] = os.path.normpath(main_path)
    return d

When the program is running as a Windows service, but is not packaged
into a single executable, main_path will become the path to the
service executable (typically, pythonservice.exe). When this data
makes it to the child process, the prepare() function will treat
main_path as a path to a python module, and will try to import it.
This causes it to fail.

My quick-and-dirty solution was to check in get_preparation_data() if
main_path ends with '.exe', and if it does, to not pass it at all.
This solves the problem in my case, but perhaps there's a better way
to fix this? Here is my version of get_preparation_data():

def get_preparation_data(name):
    '''
    Return info about parent needed by child to unpickle process
object
    '''
    from .util import _logger, _log_to_stderr

    d = dict(
        name=name,
        sys_path=sys.path,
        sys_argv=sys.argv,
        log_to_stderr=_log_to_stderr,
        orig_dir=process.ORIGINAL_DIR,
        authkey=process.current_process().authkey,
        )

    if _logger is not None:
        d['log_level'] = _logger.getEffectiveLevel()

    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            if not main_path.endswith('.exe'):
                d['main_path'] = os.path.normpath(main_path)

    return d




From matzke at berkeley.edu  Thu Feb  5 19:48:09 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Thu, 05 Feb 2009 16:48:09 -0800
Subject: global name 'sqrt' is not defined
In-Reply-To: <6v126hFhj1beU1@mid.uni-berlin.de>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>	<mailman.8921.1233865754.3487.python-list@python.org>
	<6v126hFhj1beU1@mid.uni-berlin.de>
Message-ID: <498B88C9.4010602@berkeley.edu>

OK, so the problem was that I had to exit ipython, re-enter it, and then 
import my module to get the errors to disappear.  Thanks for the help!

(PS: Is there a way to force a complete reload of a module, without 
exiting ipython?  Just doing the import command again doesn't seem to do 
it.)

Thanks!
Nick


Diez B. Roggisch wrote:
> Nick Matzke schrieb:
>>
>>
>> Scott David Daniels wrote:
>>> M.-A. Lemburg wrote:
>>>> On 2009-02-05 10:08, Nick Matzke wrote:
>>>>> ..., I can run this in the ipython shell just fine:
>>>>> a = ["12", "15", "16", "38.2"]
>>>>> dim = int(sqrt(size(a)))
>>>>> ...But if I move these commands to a function in another file, it 
>>>>> freaks out:
>>>> You need to add:
>>>>
>>>> from math import sqrt
>>> or:
>>>     from cmath import sqrt
>>> or:
>>>     from numpy import sqrt
>>
>>
>>
>>
>>
>> The weird thing is, when I do this, I still get the error:
>>
>> ============
>> nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
>> nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
>> make_half_square_array
>> nick at mws2[phylocom]|24> d = make_half_square_array(a)
>> --------------------------------------------------------------------------- 
>>
>> NameError                                 Traceback (most recent call 
>> last)
>>
>> /bioinformatics/phylocom/<ipython console> in <module>()
>>
>> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
>> make_half_square_array(linear_version_of_square_array)
>>    1548         from numpy import sqrt
>>    1549         a = linear_version_of_square_array
>> -> 1550         dim = int(sqrt(size(a)))
>>    1551
>>    1552
>>
>> NameError: global name 'sqrt' is not defined
>> nick at mws2[phylocom]|25>
>> ============
>>
>> Is there some other place I should put the import command?  I.e.:
>> 1. In the main script/ipython command line
>>
>> 2. In the called function, i.e. make_half_square_array() in 
>> LR_run_functions_v2.py
>>
>> 3. At the top of LR_run_functions_v2.py, outside of the individual 
>> functions?
> 
> The latter. Python's imports are always local to the module/file they 
> are in, not globally effective.
> 
> 
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From skippy.hammond at gmail.com  Thu Feb  5 19:48:45 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 11:48:45 +1100
Subject: subprocess returncode windows
In-Reply-To: <851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>	<mailman.5728.1229453705.3487.python-list@python.org>	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
Message-ID: <498B88ED.3060100@gmail.com>

On 6/02/2009 6:34 AM, Andrew wrote:
> Notice how python never gets the correct returncode from asadmin.bat
> but I can get the correct returncode from the shell every time. Can
> anyone tell me why Python wouldn't be able to get the correct
> returncode for asadmin?

I think the problem will be that cmd.exe doesn't return the exit code to 
*its* caller correctly.  You can often work around this by avoiding the 
use of cmd.exe to spawn the child process, but obviously you do need it 
with a .bat file.  I'm not aware of an easy work-around.

Cheers,

Mark


From bignose+hates-spam at benfinney.id.au  Thu Feb  5 19:55:17 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Fri, 06 Feb 2009 11:55:17 +1100
Subject: Where to host a (Python) project?
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com>
Message-ID: <87bptgxu2y.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
> andrew cooke  <andrew at acooke.org> wrote:
> >hi, just fyi, i investigated this and you can join any publicly
> >readable group by sending an email to the "-subscribe" address. you
> >do not need a google login for this and, as far as i can tell, it
> >then operates for you like a normal mailing list.
> 
> The same thing is theoretically true for Yahoo groups, but I've
> heard from people over the years about various difficulties fixing
> problems with list subscriptions in the absence of a real Yahoo
> login and I'm not particularly interested in finding out that the
> same thing ends up being true for Google lists.

Indeed it does. I have succeeded in subscribing to Google mailing
lists in the absence of a Google account, but *managing* that
subscription thereafter in the absence of a Google account is
obnoxiously difficult. Your caution is well advised.

-- 
 \                ?I got fired from my job the other day. They said my |
  `\          personality was weird. ? That's okay, I have four more.? |
_o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
Ben Finney


From prologic at shortcircuit.net.au  Thu Feb  5 19:55:19 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 10:55:19 +1000
Subject: global name 'sqrt' is not defined
In-Reply-To: <498B88C9.4010602@berkeley.edu>
References: <498AAC89.5080002@berkeley.edu>
	<mailman.8865.1233835298.3487.python-list@python.org>
	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>
	<mailman.8921.1233865754.3487.python-list@python.org>
	<6v126hFhj1beU1@mid.uni-berlin.de> <498B88C9.4010602@berkeley.edu>
Message-ID: <e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:48 AM, Nick Matzke <matzke at berkeley.edu> wrote:
> (PS: Is there a way to force a complete reload of a module, without exiting
> ipython?  Just doing the import command again doesn't seem to do it.)

m = __import__("mymobile")
reload(m)

cheers
James


From rhodri at wildebst.demon.co.uk  Thu Feb  5 19:57:05 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 00:57:05 -0000
Subject: where clause
In-Reply-To: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
References: <de88687e-ab5d-48c4-9cdd-6a8b34765058@w39g2000prb.googlegroups.com>
Message-ID: <op.uownlfkma8ncjz@gnudebst>

On Thu, 05 Feb 2009 18:04:35 -0000, <bearophileHUGS at lycos.com> wrote:

> p = a / b
>   where
>     a = 20 / len(c)
>     b = foo(d)

You'd want to do it with paired keywords, in the manner of try/except,
to avoid utterly breaking Python's syntax conventions.  Perhaps
something like this:

do:
   p = a / b
where:
   a = 20 / len(c)
   b = foo(d)

or even:

where:
   a = 20 / len(c)
   b = foo(d)
do:
   p = a / b


Effectively you're creating a little local namespace for temporary
variables.  I'm not sure it buys you a lot, even as sugar, and I'm
really not convinced by the bypartite form, but it's definitely
possible.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From robert.kern at gmail.com  Thu Feb  5 20:01:14 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 05 Feb 2009 19:01:14 -0600
Subject: global name 'sqrt' is not defined
In-Reply-To: <e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>
References: <498AAC89.5080002@berkeley.edu>	<mailman.8865.1233835298.3487.python-list@python.org>	<5rSdnfi3VIPQlhbUnZ2dnUVZ_r3inZ2d@pdx.net>	<mailman.8921.1233865754.3487.python-list@python.org>	<6v126hFhj1beU1@mid.uni-berlin.de>
	<498B88C9.4010602@berkeley.edu>
	<e1a84d570902051655l72f697s8746251943739d3a@mail.gmail.com>
Message-ID: <gmg24r$tk7$1@ger.gmane.org>

On 2009-02-05 18:55, James Mills wrote:
> On Fri, Feb 6, 2009 at 10:48 AM, Nick Matzke<matzke at berkeley.edu>  wrote:
>> (PS: Is there a way to force a complete reload of a module, without exiting
>> ipython?  Just doing the import command again doesn't seem to do it.)
>
> m = __import__("mymobile")
> reload(m)

Or more straightforwardly:

   import mymobile
   reload(mymobile)

If you have done

   from mymobile import *

anywhere, you will need to re-execute that line again.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From rhodri at wildebst.demon.co.uk  Thu Feb  5 20:03:56 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 01:03:56 -0000
Subject: Use list name as string
In-Reply-To: <77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>
References: <77e831100902040824q2a0b8465k4894f29ed4baba12@mail.gmail.com>
	<4989C6D0.2000604@tim.thechases.com>
	<77e831100902040857q2379bf80hc05b5575cba85bdd@mail.gmail.com>
	<4989CB47.3060806@mrabarnett.plus.com>
	<77e831100902040918j4be325d3y760120c92f8a0d7f@mail.gmail.com>
	<77e831100902040923k188e5df3q22423884f239e5a5@mail.gmail.com>
	<op.uouqpiaya8ncjz@gnudebst>
	<77e831100902041736w5194b59dubdd922c80dd82ece@mail.gmail.com>
	<op.uouyd20ma8ncjz@gnudebst>
	<77e831100902041932h502dea32s66a4aacaf247790a@mail.gmail.com>
Message-ID: <op.uownwuuea8ncjz@gnudebst>

On Thu, 05 Feb 2009 03:32:59 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> "The problem is you seem to be thinking in terms of objects having names.
> They don't.  Names have objects."I agree this is my problem. This is not
> correct terminology then?
> The name of the object is anobject

No.  The name of the object is a name.  It doesn't really exist as an
object at all.

As others have said, if you really want this information you'll need to
write your own class with a "name" attribute, and assign a suitable string
to it.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From conradwt at gmail.com  Thu Feb  5 20:29:29 2009
From: conradwt at gmail.com (Con)
Date: Thu, 5 Feb 2009 17:29:29 -0800 (PST)
Subject: MacPython 3.0 dmg installer?
Message-ID: <ddd15a49-9dee-44e5-b542-f08adbe4bdb4@r15g2000prh.googlegroups.com>

Hi, I was wondering, what's the status of the MacPython 3.0 installer
(.i.e. dmg file) ?  I have been using the previous MacPython dmg
installers with great success  without conflicting with other
installations on the system.

Thanks in advance,

-Conrad




From todpose at hotmail.com  Thu Feb  5 20:43:30 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Thu, 5 Feb 2009 17:43:30 -0800
Subject: Converting numbers to words
Message-ID: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>


I've been trying to figure this out for over 2 hours and I'm really frustrated right now.I first made Python to ask user to input height in meters. If user puts certain value in meter, then it converts it to feet and inches as follows: 
Enter the height (in metres): 1.6It is 5 feet, 3 inches high.  What I want to do is to make it type only words. For example, instead of its saying, "It is 5 feet, 3 inches high," I want it to say, "it is five feet, three inches high."I'd appreciate any suggestions.
_________________________________________________________________
Twice the fun?Share photos while you chat with Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From aaron.watters at gmail.com  Thu Feb  5 20:53:52 2009
From: aaron.watters at gmail.com (Aaron Watters)
Date: Thu, 5 Feb 2009 17:53:52 -0800 (PST)
Subject: ANN: Nucular full text indexing 0.4
Message-ID: <1eb08437-e2d2-4938-95ed-8ee4930e598c@g1g2000pra.googlegroups.com>

ANNOUNCING NUCULAR 0.4
======================

This release adds a simple "table space" wrapper
which makes Nucular easier to use for some
purposes.  It also fixes a number of bugs.

WHERE IS IT?

Find documentation and downloads at

  http://nucular.sourceforge.net/

WHAT IS IT?

Nucular is a system for creating full text
indices for fielded data. It can be accessed
via a Python API or via a suite of command
line interfaces.

Nucular archives fielded documents and
retrieves them based on field value, field
prefix, field word prefix, or full text
word prefix, word proximity or combinations
of these. Nucular also includes features
for determining values related to a query
often called query facets.

FEATURES

    * Nucular is very light weight.
Updates and accesses do not require
any server process or other system
support such as shared memory locking.

    * Nucular supports concurrency.
Arbitrary concurrent updates and
accesses by multiple processes or
threads are supported, with no
possible locking issues.

    * Nucular indexes and retrieves
data quickly.

    * Nucular has a funny name.

NOTES

The file storage format for this release is
not compatible with older formats (the change
was needed to fix a bug).

On Windows XP I had to delete the old
package manually from the Python library
before the install for the new package
would work properly.

I hope you like it.

   -- Aaron Watters

===
Fear has several advantages over gratitude.
Gratitude is intrinsically limited,
if only by the finite creative capacity of
the scientific community. Moreover, as
pointed out by a colleague at MIT, appealing
to people?s gratitude and trust is usually
less effective than pulling a gun.
  -- Richard Lindzen


From ianare at gmail.com  Thu Feb  5 21:34:05 2009
From: ianare at gmail.com (=?ISO-8859-1?B?aWFuYXLp?=)
Date: Thu, 5 Feb 2009 18:34:05 -0800 (PST)
Subject: sorting for recursive folder rename
References: <e385ba1f-cb8c-42eb-9095-2e4b4ad1ae95@e24g2000vbe.googlegroups.com>
	<mailman.5748.1229474227.3487.python-list@python.org>
Message-ID: <d90cb283-c35f-4f5e-b04e-0396a6c66ffc@b38g2000prf.googlegroups.com>

On Dec 16 2008, 7:36?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Tue, 16 Dec 2008 18:20:52 -0000, ianar? <ian... at gmail.com> wrote:
> > Hello all,
>
> > I trying to recursivelyrenamefolders and files, and am looking for
> > some ideas on the best way of doing this. The problem is that the
> > given list of items can be in order, and one to all items may be
> > renamed. Here is some preliminary code I have, but which does not work
> > very well.

self.toRename has the following structure :
[
[original_name, new_name, os.path.isdir]
..
]

# define these here for faster processing
def split(item):
    return os.path.split(item)
def addSep(path):
    return os.sep + path + os.sep
def recursiveFolderSort(x,y):
    return cmp(y[0], x[0])

sortedRename = sorted(self.toRename)

# make a list of all folders that will be processed
foldersToAdjust = []
for item in sortedRename:
    if item[2] is False:
        oF = split(item[0])[1] # original folder name
        nF = split(item[1])[1] # new folder name
        if oF is not nF:
            foldersToAdjust.append((oF, nF))

# replace all occurences of folders in path
for i in range(len(self.toRename)):
    for f in foldersToAdjust:
        oF = addSep(f[0]) # original folder name
        nF = addSep(f[1]) # new folder name
        self.toRename[i][0] = self.toRename[i][0].replace(oF,nF)
        self.toRename[i][1] = self.toRename[i][1].replace(oF,nF)

    if progressDialog.update(i) is False:
        error = 'cancelled'
        break

# make sure renaming will be in correct order !
self.toRename.sort(recursiveFolderSort)

> import os
>
> for item in self.toRename:
> ? ? ?os.renames(item[0], item[1])
>
> That's it. ?os.renames will take care of all the intermediate
> directory creation so you don't even need to sort the list.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

It's been a while since I decided to work on this again ...

Anyway, if only it were that easy !!

Traceback (most recent call last):
  File "/home/ianare/Desktop/file-folder-ren/metamorphose2/Source/
MainWindow.py", line 1477, in renameItems
    os.renames(original[0], renamed[0])
  File "/usr/lib/python2.5/os.py", line 213, in renames
    rename(old, new)
OSError: [Errno 2] No such file or directory


The problem is that if a directory is changed, all lower instances
need to be changed as well.

given the following directory structure ...

recursive
|
|_1
|  |_1
|  |  |_1.txt
|  |  |_2.txt
|  |_2
|     |_1.txt
|     |_2.txt
|_2
   |_1
   |  |_1.txt
   |  |_2.txt
   |_2
      |_1.txt
      |_2.txt

... and assuming I want to change :
recursive/2/2/2.txt  -->  recursive/2/2/14.txt

but, I ALSO want to change :
recursive/2  -->  recursive/04

it means that the first operation is really :
recursive/04/2/2.txt  -->  recursive/04/2/14.txt

os.renames will work, but it needs to have the correct path, so it
comes down to the same thing.

IOW, I need a way of :
A) adjusting paths taking into consideration all changes up and down
the tree
B) sorting normalized paths so they are renamed in the proper sequence
(depends on point 'A', obviously)

I'm pretty sure I can take care of 'B' with the following sorting
method:

# order by path depth
def recursiveFolderSort(x, y):
    x = x[0].count(os.sep)
    y = y[0].count(os.sep)
    return cmp(x, y)
self.toRename.sort(recursiveFolderSort)

but I still need a way of generating the correct names.

Solution finder will have his/her name placed on the credits page.
http://file-folder-ren.sourceforge.net/index.php?page=Links

Thanks in advance !!


From benjamin at python.org  Thu Feb  5 21:41:21 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 6 Feb 2009 02:41:21 +0000 (UTC)
Subject: MacPython 3.0 dmg installer?
References: <ddd15a49-9dee-44e5-b542-f08adbe4bdb4@r15g2000prh.googlegroups.com>
Message-ID: <loom.20090206T024034-117@post.gmane.org>

Con <conradwt <at> gmail.com> writes:

> 
> Hi, I was wondering, what's the status of the MacPython 3.0 installer
> (.i.e. dmg file) ?  I have been using the previous MacPython dmg
> installers with great success  without conflicting with other
> installations on the system.

There should be ones for 3.0.1 which is coming out within the next few weeks.






From steve at holdenweb.com  Thu Feb  5 21:42:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 05 Feb 2009 21:42:25 -0500
Subject: Converting numbers to words
In-Reply-To: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
References: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
Message-ID: <gmg82i$bd8$1@ger.gmane.org>

todpose at hotmail.com wrote:
> I've been trying to figure this out for over 2 hours and I'm really
> frustrated right now.
> 
> I first made Python to ask user to input height in meters. If user puts
> certain value in meter, then it converts it to feet and inches as follows:
>  
> 
> Enter the height (in metres): 1.6
> 
> It is 5 feet, 3 inches high.
>  
>  
> What I want to do is to make it type only words. For example, instead of
> its saying, "It is 5 feet, 3 inches high," I want it to say, "it is five
> feet, three inches high."
> I'd appreciate any suggestions.

Create a list or tuple of strings, and use the numbers to index the list.

lst = ['a', 'b', 'c']
ndx = 1
print "The letter", lst[ndx], "is number one"

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From benjamin at python.org  Thu Feb  5 21:44:20 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 6 Feb 2009 02:44:20 +0000 (UTC)
Subject: Flattening lists
References: <gmeotf$4j6$1@ger.gmane.org>	<498AE81E.6020100@aim.com>	<gmesde$g8t$1@ger.gmane.org>	<a47488650902050636y59ece07w6dd3e2d8ac1cce5f@mail.gmail.com>	<gmf0c4$eq$1@ger.gmane.org>
	<498B0F8B.8090109@aim.com> <gmf45k$h3p$1@ger.gmane.org>
Message-ID: <loom.20090206T024251-569@post.gmane.org>

mk <mrkafk <at> gmail.com> writes:
> Hmm, I'm surprised by even that! Apparently list creation is more 
> expensive than I thought - it seems somewhat more expensive than the 
> cost of interpreting bytecode for "if var is None". Either list creation 
> is somewhat costly, or "if var is None" is really cheap.

Creating a list requires several function calls on the C level (including the
dictionary lookup for the name "list") and memory allocation, which is usually
quite expensive. In contrast, the eval loop for "is None" basically uses a
pointer comparison.






From vincent at vincentdavis.net  Thu Feb  5 22:03:01 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 5 Feb 2009 20:03:01 -0700
Subject: return multiple objects
Message-ID: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>

Is it correct that if I want to return multiple objects from a function I
need to in some way combine them?
def test1():
    a = [1,3,5,7]
    b = [2,4,6,8]
    c=[a,b]
   return a, b # this does not work?
   return [a, b] # does not work?
   return c # this works but I don't like it, , is there a better way?

I saw examples where dictionaries where used but I would prefer to
just access the object names directly. As in

test1()
print a # not haing to refer to it as

is there something I am missing?


Thanks
Vincent Davis
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From clp2 at rebertia.com  Thu Feb  5 22:06:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 19:06:55 -0800
Subject: return multiple objects
In-Reply-To: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
Message-ID: <50697b2c0902051906r30bf26ck2ce914cf74e7aa88@mail.gmail.com>

On Thu, Feb 5, 2009 at 7:03 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> Is it correct that if I want to return multiple objects from a function I
> need to in some way combine them?
> def test1():
>     a = [1,3,5,7]
>     b = [2,4,6,8]
>     c=[a,b]
>    return a, b # this does not work?
>    return [a, b] # does not work?
>    return c # this works but I don't like it, , is there a better way?

All 3 of those *do work* just fine.
I suspect you happen to not be familiar with how to retrieve the
multiple results.

Here's how:

q, w = test1()
print q # prints [1,3,5,7]
print w # prints [2,4,6,8]

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Thu Feb  5 22:17:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 06 Feb 2009 01:17:01 -0200
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
Message-ID: <op.uowt2ni5x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 05 Feb 2009 17:34:29 -0200, Andrew <andrew.replogle at gmail.com>  
escribi?:

> On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
>> escribi?:
>>
>>
>>
>> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
>> >> Andrew schrieb:
>>
>> >> > I'm running into a strange situation with getting incorrect
>> >> > returncodes / exit status from python subprocess.call. I'm using a
>> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
>> >> > java applications to glassfish application server. Below is an >>  
>> > example

> I've tried this several ways now. It seems to be something specific
> with python and asadmin.bat.
>
> I've tried the following manually in the cmd.exe prompt:

[examples showing %ERRORLEVEL% correctly set when running from the command  
line, but subprocess.call doesn't get it]

> Notice how python never gets the correct returncode from asadmin.bat
> but I can get the correct returncode from the shell every time. Can
> anyone tell me why Python wouldn't be able to get the correct
> returncode for asadmin?

The last exit code set by a command *should* propagate as the exit code of  
the whole .bat, then as the exit code of the cmd.exe instance that runs  
it, and finally Python *should* receive that value. Some old Windows  
versions didn't behave like that, but AFAIK XP does the right thing here.
Unless asadmin.bat is playing tricks with %ERRORLEVEL% or something.
Can you post the contents of asadmin.bat?

Without looking into it, I can think of a few alternatives:

- rewrite asadmin.bat in Python, if feasible. Some scripts just check/set  
a few environment variables and execute some process at the end, and  
that's all; in this case it should be easy to emulate the same thing in  
Python.

- try using another layer of your own, e.g., my_asadmin.bat:

call asadmin.bat %*
exit /b %ERRORLEVEL%

- variation: write the exit code somewhere:

call asadmin.bat %*
echo %ERRORLEVEL% > asadmin.err

and read asadmin.err from Python. (I've used something like this in a  
chain Win32 process --> 16 bits GUI application --> .bat script --> old  
DOS executable)

-- 
Gabriel Genellina



From BrianVanderburg2 at aim.com  Thu Feb  5 22:20:35 2009
From: BrianVanderburg2 at aim.com (Brian Allen Vanderburg II)
Date: Thu, 05 Feb 2009 22:20:35 -0500
Subject: Converting numbers to words
In-Reply-To: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
References: <BAY121-W31197A9AB32C6AED0FD27AB9C10@phx.gbl>
Message-ID: <498BAC83.8090403@aim.com>

todpose at hotmail.com wrote:
 >
 > I've been trying to figure this out for over 2 hours and I'm really 
frustrated right now.
 >
 > I first made Python to ask user to input height in meters. If user 
puts certain value in meter, then it converts it to feet and inches as 
follows:
 >  
 >
 > Enter the height (in metres): 1.6
 >
 > It is 5 feet, 3 inches high.
 >  
 >  
 > What I want to do is to make it type only words. For example, instead 
of its saying, "It is 5 feet, 3 inches high," I want it to say, "it is 
five feet, three inches high."
 > I'd appreciate any suggestions.

I made something similar in the past.  First I break it into two 
functions, one function handles 0-999 and return '' for zero or a 
meaningful value for 999, another function handles how many groups there 
are and for each one, gets the value for it calls the first function, 
and appends the correct word.  This only works for the English language 
though

Brian Vanderburg II

num_words1 = ("zero", # not used
             "one",
             "two",
             "three",
             "four",
             "five",
             "six",
             "seven",
             "eight",
             "nine",
             "ten",
             "eleven",
             "twelve",
             "thirteen",
             "fourteen",
             "fifteen",
             "sixteen",
             "seventeen",
             "eighteen",
             "nineteen")

num_words2 = ("twenty",
             "thirty",
             "forty",
             "fifty",
             "sixty",
             "seventy",
             "eighty",
             "ninety")

num_words3 = ("thousand",
             "million",
             "billion",
             "trillion",
             "quadrillion")

def word_func1(value):
   # value can be from 0 to 999
   result = ''

   if value == 0:
       return result

   # Handle hundreds
   if value >= 100:
       hvalue = int(value / 100)
       if result:
           result += ' '
       result += num_words1[hvalue]
       result += ' hundred'
       value -= (hvalue * 100)

   if value == 0:
       return result

   # Handle 1-19
   if value < 20:
       if result:
           result += ' '
       result += num_words1[value]
       return result

   # Handle 10s (20-90)
   tvalue = int(value / 10)
   if result:
       result += ' '
   result += num_words2[tvalue - 2]
   value -= (tvalue * 10)

   if value == 0:
       return result

   # Handle ones
   if result:
       result += ' '
   result += num_words1[value]

   return result

def word_func2(value):
   result = ''

   if value == 0:
       return 'zero'

   # Determine support values
   divider = 1
   l = len(num_words3)
   for i in range(l):
       divider *= 1000

   for i in range(l):
       if value >= divider:
           dvalue = int(value / divider)
           if result:
               result += ' '
           result += word_func1(dvalue)
           result += ' '
           result += num_words3[l - i - 1]
           value -= (dvalue * divider)
       divider /= 1000

   if value > 0:
       if result:
           result += ' '
       result += word_func1(value)

   return result

number_to_word = word_func2



From rhodri at wildebst.demon.co.uk  Thu Feb  5 22:37:24 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 06 Feb 2009 03:37:24 -0000
Subject: return multiple objects
In-Reply-To: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
Message-ID: <op.uowu0mxba8ncjz@gnudebst>

On Fri, 06 Feb 2009 03:03:01 -0000, Vincent Davis  
<vincent at vincentdavis.net> wrote:

> Is it correct that if I want to return multiple objects from a function I
> need to in some way combine them?
> def test1():
>     a = [1,3,5,7]
>     b = [2,4,6,8]
>     c=[a,b]
>    return a, b # this does not work?
>    return [a, b] # does not work?
>    return c # this works but I don't like it, , is there a better way?

Strictly speaking, you can only return one object from a function.   
However,
that one object can be a container (list, tuple, dict, set, or what have
you) that contains multiple objects.  Tuples are a popular choice:

   return a, b

...but almost any ordered type would do, because you can automagically
unpack the results if you want to:

   x, y = test1()

(You might be expecting brackets around the "a, b" and the "x, y", and
you'd be sort of right.  The brackets (parentheses) for tuples are
optional, except for a couple of cases where you *have* to put them
in to avoid ambiguity.  I tend to put them in always, but leaving them
out in cases like this seems to be normal practice.)

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From skippy.hammond at gmail.com  Thu Feb  5 22:50:53 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 14:50:53 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
Message-ID: <498BB39D.5070809@gmail.com>

On 6/02/2009 11:37 AM, Volodya wrote:
> Hi all,
>
> I think I've found a small bug with multiprocessing package on
> Windows.

I'd actually argue its a bug in pythonservice.exe - it should set 
sys.argv[] to resemble a normal python process with argv[0] being the 
script.  I'll fix it...

Cheers,

Mark


From skippy.hammond at gmail.com  Thu Feb  5 23:26:08 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Fri, 06 Feb 2009 15:26:08 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BB39D.5070809@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com>
Message-ID: <498BBBE0.6090704@gmail.com>

On 6/02/2009 2:50 PM, Mark Hammond wrote:
> On 6/02/2009 11:37 AM, Volodya wrote:
>> Hi all,
>>
>> I think I've found a small bug with multiprocessing package on
>> Windows.
>
> I'd actually argue its a bug in pythonservice.exe - it should set
> sys.argv[] to resemble a normal python process with argv[0] being the
> script. I'll fix it...

Actually it appears I spoke too soon:

* A bug in pywin32 exists such that when you use 'debug' on a service, 
the argv reflected the full argv of the application, including the 
'-debug' portion of the command-line.  However, even if that is fixed, 
the next argument is actually the name of the service (as declared in 
the .py file for the service), not the .py module itself.  Thus, I could 
make argv a little more sane in this case, but still the initial problem 
would remain as argv[0] would still not be a .py file.

* When the service is started by windows itself, there are usually zero 
additional command-line arguments.  If there *are* arguments, they are 
likely to be the string the user entered via control panel as a special 
case (Windows doesn't actually remember service args - they are used 
once and discarded).  It is important we continue to expose whatever 
argv we actually got from Windows to the service code.

So unfortunately I don't think I can change pythonservice to resolve the 
issue you reported.

Cheers,

Mark


From vincent at vincentdavis.net  Thu Feb  5 23:29:49 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 5 Feb 2009 21:29:49 -0700
Subject: return multiple objects
In-Reply-To: <op.uowu0mxba8ncjz@gnudebst>
References: <77e831100902051903x5a347591k74e69ca3da947d3d@mail.gmail.com>
	<op.uowu0mxba8ncjz@gnudebst>
Message-ID: <77e831100902052029id5b939cn605e1f9728cb01cf@mail.gmail.com>

That is what I was missing,
Thanks
Vincent Davis



On Thu, Feb 5, 2009 at 8:37 PM, Rhodri James <rhodri at wildebst.demon.co.uk>wrote:

> On Fri, 06 Feb 2009 03:03:01 -0000, Vincent Davis <
> vincent at vincentdavis.net> wrote:
>
>  Is it correct that if I want to return multiple objects from a function I
>> need to in some way combine them?
>> def test1():
>>    a = [1,3,5,7]
>>    b = [2,4,6,8]
>>    c=[a,b]
>>   return a, b # this does not work?
>>   return [a, b] # does not work?
>>   return c # this works but I don't like it, , is there a better way?
>>
>
> Strictly speaking, you can only return one object from a function.
>  However,
> that one object can be a container (list, tuple, dict, set, or what have
> you) that contains multiple objects.  Tuples are a popular choice:
>
>  return a, b
>
> ...but almost any ordered type would do, because you can automagically
> unpack the results if you want to:
>
>  x, y = test1()
>
> (You might be expecting brackets around the "a, b" and the "x, y", and
> you'd be sort of right.  The brackets (parentheses) for tuples are
> optional, except for a couple of cases where you *have* to put them
> in to avoid ambiguity.  I tend to put them in always, but leaving them
> out in cases like this seems to be normal practice.)
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From greg at cosc.canterbury.ac.nz  Thu Feb  5 23:56:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Fri, 06 Feb 2009 17:56:51 +1300
Subject: ANN: SuPy - Script Sketchup with Python
Message-ID: <mailman.8980.1233928765.3487.python-announce-list@python.org>

SuPy 1.0
--------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

   http://www.cosc.canterbury.ac.nz/SuPy/

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From orlenko at gmail.com  Fri Feb  6 00:21:40 2009
From: orlenko at gmail.com (Volodymyr Orlenko)
Date: Thu, 05 Feb 2009 21:21:40 -0800
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BBBE0.6090704@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>
Message-ID: <498BC8E4.7000108@gmail.com>



On 05/02/2009 8:26 PM, Mark Hammond wrote:
> On 6/02/2009 2:50 PM, Mark Hammond wrote:
>> On 6/02/2009 11:37 AM, Volodya wrote:
>>> Hi all,
>>>
>>> I think I've found a small bug with multiprocessing package on
>>> Windows.
>>
>> I'd actually argue its a bug in pythonservice.exe - it should set
>> sys.argv[] to resemble a normal python process with argv[0] being the
>> script. I'll fix it...
>
> Actually it appears I spoke too soon:
>
> * A bug in pywin32 exists such that when you use 'debug' on a service, 
> the argv reflected the full argv of the application, including the 
> '-debug' portion of the command-line.  However, even if that is fixed, 
> the next argument is actually the name of the service (as declared in 
> the .py file for the service), not the .py module itself.  Thus, I 
> could make argv a little more sane in this case, but still the initial 
> problem would remain as argv[0] would still not be a .py file.
>
> * When the service is started by windows itself, there are usually 
> zero additional command-line arguments.  If there *are* arguments, 
> they are likely to be the string the user entered via control panel as 
> a special case (Windows doesn't actually remember service args - they 
> are used once and discarded).  It is important we continue to expose 
> whatever argv we actually got from Windows to the service code.
>
> So unfortunately I don't think I can change pythonservice to resolve 
> the issue you reported.
>
Thanks Mark, this makes perfect sense.

In the patch I submitted, I simply check if the name of the supposed 
module ends with ".exe". It works fine for my case, but maybe this is 
too general. Is there a chance that a Python module would end in ".exe"? 
If so, maybe we should check specifically for "pythonservice.exe". But 
then, if someone renames the executable (as I did, because I wanted to 
see meaningful service names in the process list), the patch will not 
work. Maybe there's another way to fix the forking module?


From agile.scrapping3 at gmail.com  Fri Feb  6 00:52:26 2009
From: agile.scrapping3 at gmail.com (agile)
Date: Thu, 5 Feb 2009 21:52:26 -0800 (PST)
Subject: What is difference between ADO and RDO
Message-ID: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>

Explain ADO and RDO


From prologic at shortcircuit.net.au  Fri Feb  6 00:54:16 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Fri, 6 Feb 2009 15:54:16 +1000
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BC8E4.7000108@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>
	<498BC8E4.7000108@gmail.com>
Message-ID: <e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>

On Fri, Feb 6, 2009 at 3:21 PM, Volodymyr Orlenko <orlenko at gmail.com> wrote:
> In the patch I submitted, I simply check if the name of the supposed module
> ends with ".exe". It works fine for my case, but maybe this is too general.
> Is there a chance that a Python module would end in ".exe"? If so, maybe we
> should check specifically for "pythonservice.exe". But then, if someone
> renames the executable (as I did, because I wanted to see meaningful service
> names in the process list), the patch will not work. Maybe there's another
> way to fix the forking module?

I believe the best way to fix this is to fix the underlying
issue that Mark has pointed out (monkey-patching mp won't do).

--JamesMills


From mail at microcorp.co.za  Fri Feb  6 00:57:28 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 07:57:28 +0200
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org><mailman.8926.1233872413.3487.python-list@python.org>
	<1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
Message-ID: <007701c9881f$cb9875e0$0d00a8c0@hendrik>

"Mensanator" <m...r at aol.com>


>On Feb 5, 4:20 pm, Terry Reedy <tjre... at udel.edu> wrote:
>> mk wrote:
>>
>> > (duck)
>>
>> > 542 comp.lang.python rtfm
>>
>> What is so unfriendly about 'read the fine manual'?
>
>You've seen a fine manual?

Oh Fine!

- Hendrik




From clp2 at rebertia.com  Fri Feb  6 01:02:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 5 Feb 2009 22:02:16 -0800
Subject: What is difference between ADO and RDO
In-Reply-To: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>
References: <4941fd6f-b0ea-41f5-b39c-071b6a658f7c@e1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902052202hc2e8101r58bf7d2378864705@mail.gmail.com>

On Thu, Feb 5, 2009 at 9:52 PM, agile <agile.scrapping3 at gmail.com> wrote:
> Explain ADO and RDO

Take 5 seconds to Google them and find their Wikipedia pages:
http://en.wikipedia.org/wiki/Remote_Data_Objects
http://en.wikipedia.org/wiki/ActiveX_Data_Objects

Apparently they're 2 Microsoft technology acronyms -- and they're
**completely irrelevant** to this mailinglist, which is about
*Python*.

My but your post is lazy, terse, and rude.

Bye now,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Fri Feb  6 01:23:32 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 08:23:32 +0200
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>	<mailman.8926.1233872413.3487.python-list@python.org><1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
	<gmfq7t$77u$1@ger.gmane.org>
Message-ID: <00bb01c98824$592b9b40$0d00a8c0@hendrik>


"Steve Holden" <steve at h...eb.com> wrote:

> Yes, and I'm fine well sure this is somewhere between a silly thread and
> a troll.

"Fine" reads wrong - it should be fining.

Silly? Us here on clp, silly?

What a monstrous thought!

I'll have you know this is a respectable
establishment, and you should be grateful
that such fine, serious folk suffer your 
impertinence without taking umbrage !

Ok Steve now it's your turn to tell me it 
does not scan.

I think this thread has buggered up a perfectly
good word for me - It will be difficult, in future,
to hear the word without having to suppress
an involuntary snigger.

- Hendrik




From r.warhekar at gmail.com  Fri Feb  6 01:27:02 2009
From: r.warhekar at gmail.com (Rahul)
Date: Thu, 5 Feb 2009 22:27:02 -0800 (PST)
Subject: i have an query regarding pyodbc
Message-ID: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>

hello all,

I have installed pyodbc on my red hat enterprise 4 linux machine but
when i go to use that using statement,

import pyodbc

through python console it gives me error as

ImportError : dynamic module does not define init function
(initpyodbc)

and when i do 'nm pyodbc.so' command i get output as

[root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
000003ec t call_gmon_start 00001600 b completed.1 000014fc d
__CTOR_END__
000014f8 d __CTOR_LIST__
         w __cxa_finalize@@GLIBC_2.1.3
000004a8 t __do_global_ctors_aux
00000410 t __do_global_dtors_aux
000015f8 d __dso_handle
00001504 d __DTOR_END__
00001500 d __DTOR_LIST__
0000150c A _DYNAMIC
00001600 A _edata
00001604 A _end
000004d8 T _fini
0000046c t frame_dummy
000004f4 r __FRAME_END__
000015e8 A _GLOBAL_OFFSET_TABLE_
         w __gmon_start__
000003b4 T _init
00001508 d __JCR_END__
00001508 d __JCR_LIST__
         w _Jv_RegisterClasses
000015fc d p.0


which means there is no init function.

So what might be the cause for that?

I have build that pyodbc twice.
Any help regarding this will be greatly appreciated.

Thanks & Regards
Rahul


From ths at arl.com.pk  Fri Feb  6 01:34:53 2009
From: ths at arl.com.pk (Tehseen Siddiqui)
Date: Fri, 06 Feb 2009 11:34:53 +0500
Subject: Python Power Point Slides
Message-ID: <4041891322e2bf49ab400664bc811fae@121.100.100.103>






----------------------------------------------------------------------
DISCLAIMER:  The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. ARL cannot accept liability for any loss or damage sustained as a result of software viruses.
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From aleksandr.goretoy at gmail.com  Fri Feb  6 01:41:20 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Fri, 6 Feb 2009 00:41:20 -0600
Subject: reconstruct html form in pyGTK window and create dict from pyGTK
Message-ID: <fa98a9e30902052241j4aa19543k6b1282b9ff704e@mail.gmail.com>

Hello All,

What would be the best way to fetch a form/s from a webpage and then
recreate it in a pygtk window?

I'm doing some research on this for a project called pynutbutter. This is
for jellpy actually, which handles creating option mappings for pynutbutter
from a GUI.
The things I know I would need some examples on:

How to work multiple glade files? (so i can have multiple pages for
different types of options) more efficient way, is this a good option?

loading of forms fields and reconstructiting in pyGTK with
comboboxes/comboboxtextentry textboxes/textentry and textviews, not how to
load them or display them...I can see that on pygtk website....but the more
efficient way to do this dynamically.

What is the best way to create a dict from a gui? just have a user type the
dict: somedict={"some":thing} or have another window pop up that handles for
name value pairs of the dict and a field for dict name.

After all this what would be the best way for me to merge this dict into a
options file. There will be other options in there. How would I only either
prepend the new dict or if one with same name exists overwrite it. Would
that be a safe move?

What would be the most effiecient and user friendly way to contruct this on
a form basis in a pyGTK GUI

defaults = {"formfield":"somevalue","anotherfield":"somefieldvalue"}
mappings =
{"somefield":"filefield1","anotherfield":"some_function(filefield2)"}
headers = {"filefield1":"somefield","filefield2":"anotherfield"}

What would be the best way for me to construct this dict from a user
friendly form in pyGTK....

Sorry this is alot of questions. Any advise on this matter will be greatly
appreciated. Thank you.


-Alex Goretoy
http://www.alexgoretoy.com
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From aleksandr.goretoy at gmail.com  Fri Feb  6 02:07:41 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Fri, 6 Feb 2009 01:07:41 -0600
Subject: Where to host a (Python) project?
In-Reply-To: <87bptgxu2y.fsf@benfinney.id.au>
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com> <87bptgxu2y.fsf@benfinney.id.au>
Message-ID: <fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>

I use google code.
http://code.google.com/p/pynutbutter

-Alex Goretoy
http://www.alexgoretoy.com



On Thu, Feb 5, 2009 at 6:55 PM, Ben Finney <
bignose+hates-spam at benfinney.id.au <bignose%2Bhates-spam at benfinney.id.au>>wrote:

> aahz at pythoncraft.com (Aahz) writes:
>
> > In article <
> 6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
> > andrew cooke  <andrew at acooke.org> wrote:
> > >hi, just fyi, i investigated this and you can join any publicly
> > >readable group by sending an email to the "-subscribe" address. you
> > >do not need a google login for this and, as far as i can tell, it
> > >then operates for you like a normal mailing list.
> >
> > The same thing is theoretically true for Yahoo groups, but I've
> > heard from people over the years about various difficulties fixing
> > problems with list subscriptions in the absence of a real Yahoo
> > login and I'm not particularly interested in finding out that the
> > same thing ends up being true for Google lists.
>
> Indeed it does. I have succeeded in subscribing to Google mailing
> lists in the absence of a Google account, but *managing* that
> subscription thereafter in the absence of a Google account is
> obnoxiously difficult. Your caution is well advised.
>
> --
>  \                "I got fired from my job the other day. They said my |
>  `\          personality was weird. ? That's okay, I have four more." |
> _o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
> Ben Finney
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From orlenko at gmail.com  Fri Feb  6 02:11:02 2009
From: orlenko at gmail.com (Volodymyr Orlenko)
Date: Thu, 05 Feb 2009 23:11:02 -0800
Subject: Using multiprocessing from a Windows service
In-Reply-To: <e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>	
	<498BB39D.5070809@gmail.com> <498BBBE0.6090704@gmail.com>	
	<498BC8E4.7000108@gmail.com>
	<e1a84d570902052154u500d75fg40a968aa9ffb7f41@mail.gmail.com>
Message-ID: <498BE286.20008@gmail.com>



On 05/02/2009 9:54 PM, James Mills wrote:
> On Fri, Feb 6, 2009 at 3:21 PM, Volodymyr Orlenko <orlenko at gmail.com> wrote:
>   
>> [...] Maybe there's another
>> way to fix the forking module?
>>     
>
> I believe the best way to fix this is to fix the underlying
> issue that Mark has pointed out (monkey-patching mp won't do).
>
>   
But according to Mark's second message in this thread, there's no way to 
make pythonservice.exe set its sys.argv[0] to a python module -- it uses 
sys.argv for debug parameters in debug mode, and for custom service 
parameters in normal mode.


From m.gritsch at gmail.com  Fri Feb  6 02:28:52 2009
From: m.gritsch at gmail.com (Markus Gritsch)
Date: Fri, 6 Feb 2009 08:28:52 +0100
Subject: web2py 1.56 is OUT
In-Reply-To: <9B19AA5B-306A-49F8-BBF2-1F8F31B2E818@cs.depaul.edu>
References: <9B19AA5B-306A-49F8-BBF2-1F8F31B2E818@cs.depaul.edu>
Message-ID: <533b7d320902052328ua9f8e41h922b5ef6645896d2@mail.gmail.com>

Hi,

when copying and pasting the example from the announcement into files,
it wont run due to some errors:

2009/2/5 Massimo Di Pierro <MDiPierro at cs.depaul.edu>:
>
> Example of code (complete app)
> =========================
>    ## in model db.py
>    from gluon.tools import *
>    db=SQLDB()
>    db.define_table('puppy', db.Field('name'), db.Field('image','upload'))
>    auth=Auth(globals(),db)

Here the line auth.define_tables() is missing.

>    crud=Crud(flobals(),db)

flobals -> globals

>    ## in controller default.py
>    def user():
>        " to expose register, login, logout, etc "
>        return dict(form=auth())
>
>    @auth.requires_login()
>    def data():
>         " to expose select, create, update, delete, etc "

The above line is indented one character too much which results in an error.

>        return dict(form=crud())
>
>    @auth.requires_login()
>    def download():
>        " for downloading uploaded images "
>        return response.download(request,db)
>
>    ## in view default/user.html
>    {{extend 'layout.html'}}
>    <div>{{=form}}</div>
>
>    ## in view default/data.html
>    {{extend 'layout.html'}}
>    <div>{{=form}}</div>

The above example is not (although stated) a complete app, even when
correcting the errors.  No index action, no links to register, login,
etc, no functionality in the data action.  If one has not already read
the web2py auth docu, one cannot understand what should be going on.

If I would have been looking at web2py for the first time, I would
have been disapointed and would not bother looking deeper.  Also the
glued-together code style without spaces after colons and around
operators looks quite special.  When suggesting PEP 8 compliance I
suggested using it in the *examples*, and just optionally in the gluon
code itself.  The example and the documentation is the stuff people
are seeing and reading when trying to get started with web2py.

I know, the above paragraphs sound quite negative.  *I* like web2py
very much and am a happy user.  I just fear that such examples will
not draw new users towards this great project.  Maybe use a simple
example without Auth the next time, which is *really* complete and
fully functional.

Kind regards,
Markus


From dq at gmail.com  Fri Feb  6 02:32:54 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 08:32:54 +0100
Subject: urllib2 performance on windows, usb connection
Message-ID: <gmgp38$m2s$00$1@news.t-online.com>

I've googled this pretty extensively and can't find anyone who's had the 
same problem, so here it is:

I wrote a console program in python to download podcasts, so speed is an 
issue.  I have 1.6 M down.  The key bit of downloading code is this:

source = urllib2.urlopen( url )
target = open( filename, 'wb' )
target.write( source.read() )

This runs great on Ubuntu.  I get DL speeds of about 1.5 Mb/s on the 
SATA HD or on a usb-connected iPod, but if I run the same program on 
Windows (with a 2 GHz core 2 duo, 7200 rpm sata drive---better hardware 
specs than the Ubuntu box), it maxes out at about 500 kb/s.  Worse, if I 
DL directly to my iPod in disk mode, I'm lucky if I even hit 100 kb/s.

So does anyone know what the deal is with this?  Why is the same code so 
much slower on Windows?  Hope someone can tell me before a holy war 
erupts :-)

--danny


From martin at v.loewis.de  Fri Feb  6 02:48:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 06 Feb 2009 08:48:41 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmgp38$m2s$00$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>
Message-ID: <498beb5a$0$3305$9b622d9e@news.freenet.de>

> So does anyone know what the deal is with this?  Why is the same code so
> much slower on Windows?  Hope someone can tell me before a holy war
> erupts :-)

Only the holy war can give an answer here. It certainly has *nothing* to
do with Python; Python calls the operating system functions to read from
the network and write to the disk almost directly. So it must be the
operating system itself that slows it down.

To investigate further, you might drop the write operating, and measure
only source.read(). If that is slower, then, for some reason, the
network speed is bad on Windows. Maybe you have the network interfaces
misconfigured? Maybe you are using wireless on Windows, but cable on
Linux? Maybe you have some network filtering software running on
Windows? Maybe it's just that Windows sucks?-)

If the network read speed is fine, but writing slows down, I ask the
same questions. Perhaps you have some virus scanner installed that
filters all write operations? Maybe Windows sucks?

Regards,
Martin



From curt.hash at gmail.com  Fri Feb  6 03:10:43 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 01:10:43 -0700
Subject: Fastest database solution
Message-ID: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>

I'm writing a small application for detecting source code plagiarism that
currently relies on a database to store lines of code.

The application has two primary functions: adding a new file to the database
and comparing a file to those that are already stored in the database.

I started out using sqlite3, but was not satisfied with the performance
results. I then tried using psycopg2 with a local postgresql server, and the
performance got even worse. My simple benchmarks show that sqlite3 is an
average of 3.5 times faster at inserting a file, and on average less than a
tenth of a second slower than psycopg2 at matching a file.

I expected postgresql to be a lot faster ... is there some peculiarity in
psycopg2 that could be causing slowdown? Are these performance results
typical? Any suggestions on what to try from here? I don't think my
code/queries are inherently slow, but I'm not a DBA or a very accomplished
Python developer, so I could be wrong.

Any advice is appreciated.
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From duncan.booth at invalid.invalid  Fri Feb  6 04:05:25 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 6 Feb 2009 09:05:25 GMT
Subject: urllib2 performance on windows, usb connection
References: <gmgp38$m2s$00$1@news.t-online.com>
Message-ID: <Xns9BAA5BD5A6FF6duncanbooth@127.0.0.1>

dq <dq at gmail.com> wrote:

> This runs great on Ubuntu.  I get DL speeds of about 1.5 Mb/s on the 
> SATA HD or on a usb-connected iPod, but if I run the same program on 
> Windows (with a 2 GHz core 2 duo, 7200 rpm sata drive---better hardware 
> specs than the Ubuntu box), it maxes out at about 500 kb/s.  Worse, if I 
> DL directly to my iPod in disk mode, I'm lucky if I even hit 100 kb/s.
> 
> So does anyone know what the deal is with this?  Why is the same code so 
> much slower on Windows?  Hope someone can tell me before a holy war 
> erupts :-)
> 

Just a guess, but are you running any kind of virus scanning software on 
Windows? That could have a massive impact on the speed of writing to disc.

-- 
Duncan Booth http://kupuguy.blogspot.com


From dickinsm at gmail.com  Fri Feb  6 04:11:55 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Fri, 6 Feb 2009 01:11:55 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8926.1233872413.3487.python-list@python.org><1b50521f-b33b-4e3e-9a3e-65e8eb2f7242@v18g2000pro.googlegroups.com>
	<gmfq7t$77u$1@ger.gmane.org>
	<mailman.8957.1233902385.3487.python-list@python.org>
Message-ID: <155f77da-1071-4122-bff0-44d868f2c7b2@i18g2000prf.googlegroups.com>

On Feb 6, 6:23?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> I think this thread has buggered up a perfectly
                          ^^^^^^^^^^^

Such language.  I'm appalled.

Mark


From rogerb at rogerbinns.com  Fri Feb  6 04:12:45 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Fri, 06 Feb 2009 01:12:45 -0800
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <gmguue$uj4$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Curt Hash wrote:
> I started out using sqlite3, but was not satisfied with the performance
> results. I then tried using psycopg2 with a local postgresql server, and
> the performance got even worse. 

SQLite is in the same process.  Communication with postgres is via
another process so marshalling the traffic and context switches will
impose overhead as you found.

> I don't think
> my code/queries are inherently slow, but I'm not a DBA or a very
> accomplished Python developer, so I could be wrong.

It doesn't sound like a database is the best solution to your issue
anyway.  A better solution would likely be some form of hashing the
lines and storing something that gives quick hash lookups.  The hash
would have to do things like not care what variable names are used etc.

There are already lots of plagiarism detectors out there so it may be
more prudent using one of them, or at least learn how they do things so
your own system could improve on them.

Roger
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EKwAoKpDMRzr7GzCKeYxn93TU69nDx4X
=4r01
-----END PGP SIGNATURE-----



From tino at wildenhain.de  Fri Feb  6 04:17:42 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Fri, 06 Feb 2009 10:17:42 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <498C0036.4070805@wildenhain.de>

Hi Curt,

Curt Hash wrote:
> I'm writing a small application for detecting source code plagiarism 
> that currently relies on a database to store lines of code.
> 
> The application has two primary functions: adding a new file to the 
> database and comparing a file to those that are already stored in the 
> database.
> 
> I started out using sqlite3, but was not satisfied with the performance 
> results. I then tried using psycopg2 with a local postgresql server, and 
> the performance got even worse. My simple benchmarks show that sqlite3 
> is an average of 3.5 times faster at inserting a file, and on average 
> less than a tenth of a second slower than psycopg2 at matching a file.
> 
> I expected postgresql to be a lot faster ... is there some peculiarity 
> in psycopg2 that could be causing slowdown? Are these performance 
> results typical? Any suggestions on what to try from here? I don't think 
> my code/queries are inherently slow, but I'm not a DBA or a very 
> accomplished Python developer, so I could be wrong.

Off hand thats hard to tell w/o any details on what you are actually
doing. At least an outline what kind of data you are storing and
of course details of your database configuration would be helpful.

Please note that postgres is quite good at handling concurrent load -
this does not mean its best or every desk top database application.

Regards
Tino
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From soft_smith at yahoo.com  Fri Feb  6 04:49:34 2009
From: soft_smith at yahoo.com (Kalyankumar Ramaseshan)
Date: Fri, 6 Feb 2009 01:49:34 -0800 (PST)
Subject: Question on Strings
Message-ID: <984064.27780.qm@web112219.mail.gq1.yahoo.com>


Hi,

Excuse me if this is a repeat question!

I just wanted to know how are strings represented in python?

I need to know in terms of:

a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?
b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)? 

Any help in this regard is appreciated.

Thank you.

Regards
Kalyan



      



From asmodai at in-nomine.org  Fri Feb  6 04:54:06 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Fri, 6 Feb 2009 10:54:06 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <20090206095406.GL14658@nexus.in-nomine.org>

-On [20090206 09:11], Curt Hash (curt.hash at gmail.com) wrote:
>I'm writing a small application for detecting source code plagiarism that
>currently relies on a database to store lines of code.
>
>The application has two primary functions: adding a new file to the database
>and comparing a file to those that are already stored in the database.

Maybe CouchDB [1] is more in line with what you need.

[1] http://couchdb.apache.org/

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From agile.scrapping at gmail.com  Fri Feb  6 04:56:22 2009
From: agile.scrapping at gmail.com (Agile Consulting)
Date: Fri, 6 Feb 2009 01:56:22 -0800 (PST)
Subject: What is difference between ADO and RDO
Message-ID: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>

Explain ADO and RDO


From clp2 at rebertia.com  Fri Feb  6 05:24:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 02:24:09 -0800
Subject: Question on Strings
In-Reply-To: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
Message-ID: <50697b2c0902060224m6b5d5c09uf4c8cbdb0c83d1bf@mail.gmail.com>

On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
<soft_smith at yahoo.com> wrote:
>
> Hi,
>
> Excuse me if this is a repeat question!
>
> I just wanted to know how are strings represented in python?
>
> I need to know in terms of:
>
> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

IIRC, Depends on what the build settings were when CPython was
compiled. UTF-16 is the default.

> b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)?

No. They are implicitly converted to ASCII in such cases. To properly
handle non-ASCII Unicode characters, you need to encode/decode the
strings to/from bytes manually by specifying the encoding.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From r.warhekar at gmail.com  Fri Feb  6 05:53:31 2009
From: r.warhekar at gmail.com (Rahul)
Date: Fri, 6 Feb 2009 02:53:31 -0800 (PST)
Subject: i have an query regarding pyodbc
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
Message-ID: <ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>

On Feb 6, 11:27?am, Rahul <r.warhe... at gmail.com> wrote:
> hello all,
>
> I have installed pyodbc on my red hat enterprise 4 linux machine but
> when i go to use that using statement,
>
> import pyodbc
>
> through python console it gives me error as
>
> ImportError : dynamic module does not define init function
> (initpyodbc)
>
> and when i do 'nm pyodbc.so' command i get output as
>
> [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
> 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
> __CTOR_END__
> 000014f8 d __CTOR_LIST__
> ? ? ? ? ?w __cxa_finalize@@GLIBC_2.1.3
> 000004a8 t __do_global_ctors_aux
> 00000410 t __do_global_dtors_aux
> 000015f8 d __dso_handle
> 00001504 d __DTOR_END__
> 00001500 d __DTOR_LIST__
> 0000150c A _DYNAMIC
> 00001600 A _edata
> 00001604 A _end
> 000004d8 T _fini
> 0000046c t frame_dummy
> 000004f4 r __FRAME_END__
> 000015e8 A _GLOBAL_OFFSET_TABLE_
> ? ? ? ? ?w __gmon_start__
> 000003b4 T _init
> 00001508 d __JCR_END__
> 00001508 d __JCR_LIST__
> ? ? ? ? ?w _Jv_RegisterClasses
> 000015fc d p.0
>
> which means there is no init function.
>
> So what might be the cause for that?
>
> I have build that pyodbc twice.
> Any help regarding this will be greatly appreciated.
>
> Thanks & Regards
> Rahul

this problem was due to not proper building of pyodbc


From r.warhekar at gmail.com  Fri Feb  6 05:56:56 2009
From: r.warhekar at gmail.com (Rahul)
Date: Fri, 6 Feb 2009 02:56:56 -0800 (PST)
Subject: i have an query regarding pyodbc
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
	<ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>
Message-ID: <519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>

On Feb 6, 3:53?pm, Rahul <r.warhe... at gmail.com> wrote:
> On Feb 6, 11:27?am, Rahul <r.warhe... at gmail.com> wrote:
>
>
>
> > hello all,
>
> > I have installed pyodbc on my red hat enterprise 4 linux machine but
> > when i go to use that using statement,
>
> > import pyodbc
>
> > through python console it gives me error as
>
> > ImportError : dynamic module does not define init function
> > (initpyodbc)
>
> > and when i do 'nm pyodbc.so' command i get output as
>
> > [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
> > 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
> > __CTOR_END__
> > 000014f8 d __CTOR_LIST__
> > ? ? ? ? ?w __cxa_finalize@@GLIBC_2.1.3
> > 000004a8 t __do_global_ctors_aux
> > 00000410 t __do_global_dtors_aux
> > 000015f8 d __dso_handle
> > 00001504 d __DTOR_END__
> > 00001500 d __DTOR_LIST__
> > 0000150c A _DYNAMIC
> > 00001600 A _edata
> > 00001604 A _end
> > 000004d8 T _fini
> > 0000046c t frame_dummy
> > 000004f4 r __FRAME_END__
> > 000015e8 A _GLOBAL_OFFSET_TABLE_
> > ? ? ? ? ?w __gmon_start__
> > 000003b4 T _init
> > 00001508 d __JCR_END__
> > 00001508 d __JCR_LIST__
> > ? ? ? ? ?w _Jv_RegisterClasses
> > 000015fc d p.0
>
> > which means there is no init function.
>
> > So what might be the cause for that?
>
> > I have build that pyodbc twice.
> > Any help regarding this will be greatly appreciated.
>
> > Thanks & Regards
> > Rahul
>
> this problem was due to not proper building of pyodbc

Now my problem was,
i have two versions of python installed at different locations but
when i use import statement from psp pages
it displays the error as
ImportError : dynamic module does not define init function(initpyodbc)

this error was due to pointing to older version of python.

So, i want to know how to point my import statements to the new
version of python.

Thanks & regards
Rahul


From Ken at Elkabany.com  Fri Feb  6 06:03:28 2009
From: Ken at Elkabany.com (Ken Elkabany)
Date: Fri, 6 Feb 2009 03:03:28 -0800
Subject: Changing return of type(obj)
Message-ID: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>

Hello,

I am attempting to fully-simulate an 'int' object with a custom object type.
It is part of a library I am creating for python futures and promises. Is
there anyway such that type(my_object) can return <type 'int'>? Or for that
matter, any other primitive? I do not care how dirty the solution might
possibly be; Could there be a way through the C API? Though I predict it
will cause a mess with the interpreter.

Thanks,

Ken Elkabany
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From tino at wildenhain.de  Fri Feb  6 06:11:38 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Fri, 06 Feb 2009 12:11:38 +0100
Subject: Question on Strings
In-Reply-To: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
Message-ID: <498C1AEA.8060303@wildenhain.de>

Hi,

Kalyankumar Ramaseshan wrote:
> Hi,
> 
> Excuse me if this is a repeat question!
> 
> I just wanted to know how are strings represented in python?

It depents on if you mean python2.x or python3.x - the model
changed.

Python 2.x knows str and unicode  - the former a sequence
of single byte characters and unicode depending on configure
options either 16 or 32 bit per character.

str in python3.x replaces unicode and what formerly used
to be like str is now bytes (iirc).

> I need to know in terms of:
> 
> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

It uses an internal fixed length encoding for unicode, not UTF

> b) They are converted to utf-8 format when it is needed for e.g. when storing the string to disk or sending it through a socket (tcp/ip)? 

Nope. You need to do this explicitely. Default encoding for python2.x
implicit conversion is ascii.

In python2.x you would use unicodestr.encode('utf-8')
and simplestr.decode('utf-8') to convert an utf-8 encoded
string back to internal unicode.

There are many encodings available to select from.

> Any help in this regard is appreciated.

Please see also pythons documentation which is very
good and just try it out in the interactive interpreter

Regards
Tino
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From clp2 at rebertia.com  Fri Feb  6 06:42:30 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 03:42:30 -0800
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>

On Fri, Feb 6, 2009 at 3:03 AM, Ken Elkabany <Ken at elkabany.com> wrote:
> Hello,
>
> I am attempting to fully-simulate an 'int' object with a custom object type.
> It is part of a library I am creating for python futures and promises. Is
> there anyway such that type(my_object) can return <type 'int'>? Or for that
> matter, any other primitive? I do not care how dirty the solution might
> possibly be; Could there be a way through the C API? Though I predict it
> will cause a mess with the interpreter.

Any particular reason why subclassing 'int' wouldn't be good enough?
(You did know you can do that, right?)
I know you can subclass int at the Python level and I would think you
should be able to do it at the C level also (if not, the design just
gets only slightly more involved).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Ken at Elkabany.com  Fri Feb  6 06:49:17 2009
From: Ken at Elkabany.com (Ken Elkabany)
Date: Fri, 6 Feb 2009 03:49:17 -0800
Subject: Changing return of type(obj)
In-Reply-To: <50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
	<50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
Message-ID: <d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>

I would simply subclass 'int', but this object needs to be general enough to
pretend to be an 'int', 'NoneType', 'str', etc... A long shot: Can I change
the base class on an instance by instance basis depending on the need? Well,
now I can imagine having a class factory that will spawn for me the class
that inherits the correct base type. Any other solutions?

Thanks Chris.

On Fri, Feb 6, 2009 at 3:42 AM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Fri, Feb 6, 2009 at 3:03 AM, Ken Elkabany <Ken at elkabany.com> wrote:
> > Hello,
> >
> > I am attempting to fully-simulate an 'int' object with a custom object
> type.
> > It is part of a library I am creating for python futures and promises. Is
> > there anyway such that type(my_object) can return <type 'int'>? Or for
> that
> > matter, any other primitive? I do not care how dirty the solution might
> > possibly be; Could there be a way through the C API? Though I predict it
> > will cause a mess with the interpreter.
>
> Any particular reason why subclassing 'int' wouldn't be good enough?
> (You did know you can do that, right?)
> I know you can subclass int at the Python level and I would think you
> should be able to do it at the C level also (if not, the design just
> gets only slightly more involved).
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From unews at nospam.onlinehome.de  Fri Feb  6 07:01:39 2009
From: unews at nospam.onlinehome.de (Uwe Grauer)
Date: Fri, 06 Feb 2009 13:01:39 +0100
Subject: kinterbasdb + firebird 1.5 with python 2.6 ?
In-Reply-To: <mailman.8923.1233870149.3487.python-list@python.org>
References: <mailman.8719.1233689579.3487.python-list@python.org>	<gmc9ot$ops$1@online.de>
	<mailman.8923.1233870149.3487.python-list@python.org>
Message-ID: <gmh8r3$1ns$1@online.de>

Laszlo Nagy wrote:
> Uwe Grauer ?rta:
>> Laszlo Nagy wrote:
>> Get it from here:
>> http://www.firebirdsql.org/index.php?op=devel&sub=python
>>   
> Thanks. Unfortunately, this does not support Firebird 1.5 anymore. I can
> only find Python 2.5 + Firebird 1.5. But not for Python 2.6. I'm going
> to downgrade. :-(
> 

Can you point me to where you read about stopped support for FB 1.5?
Could it be that you have to just compile it against FB 1.5 libs to get
a working version?

Uwe


From __peter__ at web.de  Fri Feb  6 07:02:12 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 06 Feb 2009 13:02:12 +0100
Subject: sorting for recursive folder rename
References: <e385ba1f-cb8c-42eb-9095-2e4b4ad1ae95@e24g2000vbe.googlegroups.com>
	<mailman.5748.1229474227.3487.python-list@python.org>
	<d90cb283-c35f-4f5e-b04e-0396a6c66ffc@b38g2000prf.googlegroups.com>
Message-ID: <gmh8s3$4sf$01$1@news.t-online.com>

ianar? wrote:

> On Dec 16 2008, 7:36?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
> wrote:
>> On Tue, 16 Dec 2008 18:20:52 -0000, ianar? <ian... at gmail.com> wrote:
>> > Hello all,
>>
>> > I trying to recursivelyrenamefolders and files, and am looking for
>> > some ideas on the best way of doing this. The problem is that the
>> > given list of items can be in order, and one to all items may be
>> > renamed. Here is some preliminary code I have, but which does not work
>> > very well.
> 
> self.toRename has the following structure :
> [
> [original_name, new_name, os.path.isdir]
> ..
> ]
> 
> # define these here for faster processing
> def split(item):
>     return os.path.split(item)
> def addSep(path):
>     return os.sep + path + os.sep
> def recursiveFolderSort(x,y):
>     return cmp(y[0], x[0])
> 
> sortedRename = sorted(self.toRename)
> 
> # make a list of all folders that will be processed
> foldersToAdjust = []
> for item in sortedRename:
>     if item[2] is False:
>         oF = split(item[0])[1] # original folder name
>         nF = split(item[1])[1] # new folder name
>         if oF is not nF:
>             foldersToAdjust.append((oF, nF))
> 
> # replace all occurences of folders in path
> for i in range(len(self.toRename)):
>     for f in foldersToAdjust:
>         oF = addSep(f[0]) # original folder name
>         nF = addSep(f[1]) # new folder name
>         self.toRename[i][0] = self.toRename[i][0].replace(oF,nF)
>         self.toRename[i][1] = self.toRename[i][1].replace(oF,nF)
> 
>     if progressDialog.update(i) is False:
>         error = 'cancelled'
>         break
> 
> # make sure renaming will be in correct order !
> self.toRename.sort(recursiveFolderSort)
> 
>> import os
>>
>> for item in self.toRename:
>> os.renames(item[0], item[1])
>>
>> That's it. ?os.renames will take care of all the intermediate
>> directory creation so you don't even need to sort the list.
>>
>> --
>> Rhodri James *-* Wildebeeste Herder to the Masses
> 
> It's been a while since I decided to work on this again ...
> 
> Anyway, if only it were that easy !!
> 
> Traceback (most recent call last):
>   File "/home/ianare/Desktop/file-folder-ren/metamorphose2/Source/
> MainWindow.py", line 1477, in renameItems
>     os.renames(original[0], renamed[0])
>   File "/usr/lib/python2.5/os.py", line 213, in renames
>     rename(old, new)
> OSError: [Errno 2] No such file or directory
> 
> 
> The problem is that if a directory is changed, all lower instances
> need to be changed as well.
> 
> given the following directory structure ...
> 
> recursive
> |
> |_1
> |  |_1
> |  |  |_1.txt
> |  |  |_2.txt
> |  |_2
> |     |_1.txt
> |     |_2.txt
> |_2
>    |_1
>    |  |_1.txt
>    |  |_2.txt
>    |_2
>       |_1.txt
>       |_2.txt
> 
> ... and assuming I want to change :
> recursive/2/2/2.txt  -->  recursive/2/2/14.txt
> 
> but, I ALSO want to change :
> recursive/2  -->  recursive/04
> 
> it means that the first operation is really :
> recursive/04/2/2.txt  -->  recursive/04/2/14.txt
> 
> os.renames will work, but it needs to have the correct path, so it
> comes down to the same thing.
> 
> IOW, I need a way of :
> A) adjusting paths taking into consideration all changes up and down
> the tree
> B) sorting normalized paths so they are renamed in the proper sequence
> (depends on point 'A', obviously)
> 
> I'm pretty sure I can take care of 'B' with the following sorting
> method:
> 
> # order by path depth
> def recursiveFolderSort(x, y):
>     x = x[0].count(os.sep)
>     y = y[0].count(os.sep)
>     return cmp(x, y)
> self.toRename.sort(recursiveFolderSort)
> 
> but I still need a way of generating the correct names.


I don't see the problem. Just rename the deepest files and directories
first.

# untested

def old_depth((old, new)):
    p = os.path.abspath(old)
    return p.count(os.sep) - p.endswith(os.sep) # don't count trailing slash

pairs = sorted(self.toRename, key=old_depth, reverse=True)
for old, new in pairs:
   os.rename(old, new)

Because "recursive/2/2/2.txt" has more slashes it will be processed
before "recursive/2" and thus when the latter is processed the former's
path will change implicitly.

Peter


From lists at cheimes.de  Fri Feb  6 07:05:50 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 06 Feb 2009 13:05:50 +0100
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>	<50697b2c0902060342y198e6891xfe14ca5807effea5@mail.gmail.com>
	<d5e947120902060349s754c8b09ge445b998e07b4084@mail.gmail.com>
Message-ID: <gmh92v$ump$1@ger.gmane.org>

Ken Elkabany schrieb:
> I would simply subclass 'int', but this object needs to be general enough to
> pretend to be an 'int', 'NoneType', 'str', etc... A long shot: Can I change
> the base class on an instance by instance basis depending on the need? Well,
> now I can imagine having a class factory that will spawn for me the class
> that inherits the correct base type. Any other solutions?

No, it's not possible. The type is an inherent part of an object. Python
looks up methods and other attributes by looking at the type. The method
call obj.method() is implemented as type(obj).method(obj).

Christian



From steve at holdenweb.com  Fri Feb  6 07:09:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 07:09:29 -0500
Subject: Python Power Point Slides
In-Reply-To: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
References: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
Message-ID: <gmh99r$unb$1@ger.gmane.org>

Tehseen Siddiqui wrote:
> ------------------------------------------------------------------------
> 
> DISCLAIMER: The information in this email is confidential and may be
> legally privileged. [... etc.]

What information?
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From sjmachin at lexicon.net  Fri Feb  6 07:10:13 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 04:10:13 -0800 (PST)
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com> 
	<mailman.8967.1233915857.3487.python-list@python.org>
Message-ID: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>

On Feb 6, 9:24?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
>
> <soft_sm... at yahoo.com> wrote:
>
> > Hi,
>
> > Excuse me if this is a repeat question!
>
> > I just wanted to know how are strings represented in python?
>
> > I need to know in terms of:
>
> > a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?

Neither.

>
> IIRC, Depends on what the build settings were when CPython was
> compiled. UTF-16 is the default.

Unicode strings are held as arrays of 16-bit numbers or 32-bit numbers
[of which only 21 are used]. If you must use an acronym, use UCS-2 or
UCS-4.

The UTF-n siblings are *external* representations.
2.x: a_unicode_object.decode('UTF-16') -> an_str_object
3.x: an_str_object.decode('UTF-16') -> a_bytes_object

By the way, has anyone come up with a name for the shifting effect
observed above on str, and also with repr, range, and the iter*
family? If not, I suggest that the language's association with the
best of English humour be widened so that it be dubbed the "Mad
Hatter's Tea Party" effect.


From mal at egenix.com  Fri Feb  6 07:19:55 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Fri, 06 Feb 2009 13:19:55 +0100
Subject: Fastest database solution
In-Reply-To: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
Message-ID: <498C2AEB.1010907@egenix.com>

On 2009-02-06 09:10, Curt Hash wrote:
> I'm writing a small application for detecting source code plagiarism that
> currently relies on a database to store lines of code.
> 
> The application has two primary functions: adding a new file to the database
> and comparing a file to those that are already stored in the database.
> 
> I started out using sqlite3, but was not satisfied with the performance
> results. I then tried using psycopg2 with a local postgresql server, and the
> performance got even worse. My simple benchmarks show that sqlite3 is an
> average of 3.5 times faster at inserting a file, and on average less than a
> tenth of a second slower than psycopg2 at matching a file.
> 
> I expected postgresql to be a lot faster ... is there some peculiarity in
> psycopg2 that could be causing slowdown? Are these performance results
> typical? Any suggestions on what to try from here? I don't think my
> code/queries are inherently slow, but I'm not a DBA or a very accomplished
> Python developer, so I could be wrong.
> 
> Any advice is appreciated.

In general, if you do bulk insert into a large table, you should consider
turning off indexing on the table and recreate/update the indexes in one
go afterwards.

But regardless of this detail, I think you should consider a filesystem
based approach. This is going to be a lot faster than using a
database to store the source code line by line. You can still use
a database for the administration and indexing of the data, e.g.
by storing a hash of each line in the database.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 06 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From thomasvangurp at gmail.com  Fri Feb  6 07:30:56 2009
From: thomasvangurp at gmail.com (thomasvangurp at gmail.com)
Date: Fri, 6 Feb 2009 04:30:56 -0800 (PST)
Subject: Python 3.0 slow file IO
References: <9e7dc260-1680-42e3-9b93-7bc6c86b2f10@r37g2000prr.googlegroups.com>
	<gmej72$heu$1@ger.gmane.org>
	<mailman.8869.1233837571.3487.python-list@python.org>
Message-ID: <5ea62aa0-5e5a-4faf-9c1f-dde84f01f643@r41g2000prr.googlegroups.com>

Thanks a lot for all the responses. I'll move back to Python 2.5 for
compatibility with SciPY and some other third party packages.
I'll leave the compilation process for some other day, for now I'm a
happy user, mayve In the future I would like to contribute to the
developmental process..


From Olivier.Darge at gmail.com  Fri Feb  6 07:37:54 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Fri, 6 Feb 2009 04:37:54 -0800 (PST)
Subject: What is difference between ADO and RDO
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
Message-ID: <a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>

On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
> Explain ADO and RDO

RU a bot ?

Olivier


From agile.scrapping3 at gmail.com  Fri Feb  6 07:59:19 2009
From: agile.scrapping3 at gmail.com (agile)
Date: Fri, 6 Feb 2009 04:59:19 -0800 (PST)
Subject: is python Object oriented??
References: <783b47270901290201p311b6681rc132ca7b175ede83@mail.gmail.com> 
	<50697b2c0901290225ufb1580ep706c332b99cc59fa@mail.gmail.com> 
	<cf0662410901290347k4b310e03m6c4b2606c1ee5bdc@mail.gmail.com> 
	<4981985B.4070108@wildenhain.de>
	<783b47270901290558y7a4eed9bi59e362dad37879e1@mail.gmail.com> 
	<bf2855e60901300643q1d0f1e46k3c39a9d95cd10c58@mail.gmail.com> 
	<498363C0.5070909@gmail.com>
	<mailman.8399.1233348883.3487.python-list@python.org>
Message-ID: <a495b213-b509-49ff-b36b-80ce67cb103d@q30g2000prq.googlegroups.com>

On Jan 31, 1:54?am, Christian Heimes <li... at cheimes.de> wrote:
> Michael Torrie schrieb:
>
> >> It all depends on implementation, I think even we can make "C" object
> >> oriented with proper implementation.
>
> > Indeed, any code based on gobject libraries can be object-oriented in
> > design and function.
>
> The Python C API is a good example for well designed and object oriented
> C code.
>
> Christian

hello


From Krzysztof.Retel at googlemail.com  Fri Feb  6 08:15:30 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Fri, 6 Feb 2009 05:15:30 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com> 
	<471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>
Message-ID: <8605eb07-4995-4d96-a118-c5fa4565cd6c@b38g2000prf.googlegroups.com>

On Feb 5, 11:51?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 5, 3:35?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
> > On Feb 5, 2:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 5, 2:48?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>
> > > > Lionel wrote:
>
> > > > ?> Hello,
> > > > ?> I have data stored in binary files. Some of these files are
> > > > ?> huge...upwards of 2 gigs or more. They consist of 32-bit float complex
> > > > ?> numbers where the first 32 bits of the file is the real component, the
> > > > ?> second 32bits is the imaginary, the 3rd 32-bits is the real component
> > > > ?> of the second number, etc.
> > > > ?>
> > > > ?> I'd like to be able to read in just the real components, load them
> > > > ?> into a numpy.ndarray, then load the imaginary coponents and load them
> > > > ?> into a numpy.ndarray. ?I need the real and imaginary components stored
> > > > ?> in seperate arrays, they cannot be in a single array of complex
> > > > ?> numbers except for temporarily. I'm trying to avoid temporary storage,
> > > > ?> though, because of the size of the files.
> > > > ?>
> > > > ?> I'm currently reading the file scanline-by-scanline to extract rows of
> > > > ?> complex numbers which I then loop over and load into the real/
> > > > ?> imaginary arrays as follows:
> > > > ?>
> > > > ?>
> > > > ?> ? ? ? ? self._realData ? ? ? ? = numpy.empty((Rows, Columns), dtype =
> > > > ?> numpy.float32)
> > > > ?> ? ? ? ? self._imaginaryData = numpy.empty((Rows, Columns), dtype =
> > > > ?> numpy.float32)
> > > > ?>
> > > > ?> ? ? ? ? floatData = array.array('f')
> > > > ?>
> > > > ?> ? ? ? ? for CurrentRow in range(Rows):
> > > > ?>
> > > > ?> ? ? ? ? ? ? floatData.fromfile(DataFH, (Columns*2))
> > > > ?>
> > > > ?> ? ? ? ? ? ? position = 0
> > > > ?> ? ? ? ? ? ? for CurrentColumn in range(Columns):
> > > > ?>
> > > > ?> ? ? ? ? ? ? ? ? ?self._realData[CurrentRow, CurrentColumn] ? ? ? ? ?=
> > > > ?> floatData[position]
> > > > ?> ? ? ? ? ? ? ? ? self._imaginaryData[CurrentRow, CurrentColumn] ?=
> > > > ?> floatData[position+1]
> > > > ?> ? ? ? ? ? ? ? ? position = position + 2
> > > > ?>
> > > > ?>
> > > > ?> The above code works but is much too slow. If I comment out the body
> > > > ?> of the "for CurrentColumn in range(Columns)" loop, the performance is
> > > > ?> perfectly adequate i.e. function call overhead associated with the
> > > > ?> "fromfile(...)" call is not very bad at all. What seems to be most
> > > > ?> time-consuming are the simple assignment statements in the
> > > > ?> "CurrentColumn" for-loop.
> > > > ?>
> > > > [snip]
> > > > Try array slicing. floatData[0::2] will return the real parts and
> > > > floatData[1::2] will return the imaginary parts. You'll have to read up
> > > > how to assign to a slice of the numpy array (it might be
> > > > "self._realData[CurrentRow] = real_parts" or "self._realData[CurrentRow,
> > > > :] = real_parts").
>
> > > > BTW, it's not the function call overhead of fromfile() which takes the
> > > > time, but actually reading data from the file.
>
> > > Very nice! I like that! I'll post the improvement (if any).
>
> > > L- Hide quoted text -
>
> > > - Show quoted text -
>
> > Okay, the following:
>
> > ? ? ? ? ? ? self._realData[CurrentRow] ? ? ?= floatData[0::2]
> > ? ? ? ? ? ? self._imaginaryData[CurrentRow] = floatData[1::2]
>
> > gives a 3.5x improvement in execution speed over the original that I
> > posted. That's much better. Thank you for the suggestion.
>
> > L- Hide quoted text -
>
> > - Show quoted text -
>
> Correction: improvement is around 7-8x.

I had similar issues while Slicing Network packets (TCP/UDP) on a real
time basis.
I was using 're' and found it a lot more time and resource consuming,
than 'normal' string slicing as suggested by MRAB.

K


From grahn+nntp at snipabacken.se  Fri Feb  6 08:17:29 2009
From: grahn+nntp at snipabacken.se (Jorgen Grahn)
Date: 6 Feb 2009 13:17:29 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
Message-ID: <slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>

On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar265 at gmail.com> wrote:
> Hi. Does anyone know how to scan a file character by character and
> have each character so I can put it into a variable. I am attempting
> to make a chatbot and need this to read the saved input to look for
> spelling mistakes and further analysis of user input.

That does not follow. To analyze a text, the worst possible starting
point is one variable for each character (what would you call them --
character_1, character_2, ... character_65802 ?)

/Jorgen

-- 
  // Jorgen Grahn <grahn@        Ph'nglui mglw'nafh Cthulhu
\X/     snipabacken.se>          R'lyeh wgah'nagl fhtagn!


From Slaunger at gmail.com  Fri Feb  6 08:20:08 2009
From: Slaunger at gmail.com (Slaunger)
Date: Fri, 6 Feb 2009 05:20:08 -0800 (PST)
Subject: Skipping bytes while reading a binary file?
References: <279bf987-8e3c-465d-a173-49b3d99a298a@s9g2000prg.googlegroups.com>
	<mailman.8929.1233874125.3487.python-list@python.org>
	<695d1efb-6144-4004-a4df-e387e26fa32f@p2g2000prf.googlegroups.com>
	<4e375a89-9a53-49d0-b604-6d43643fca08@x6g2000pre.googlegroups.com> 
	<471af752-fd37-41a8-8f07-c36e1eecb829@f40g2000pri.googlegroups.com>
Message-ID: <77b8d066-0634-4a68-bd9a-a0a44079564c@r10g2000prf.googlegroups.com>


You might also want to have a look at a numpy memmap viewed as a
recarray.

from numpy import dtype, memmap, recarray
# Define your record in the file, 4bytes for the real value,
# and 4 bytes for the imaginary (assuming Little Endian repr)
descriptor = dtype([("r", "<f4"), ("i", "<f4")])
# Now typecast a memap (a memory efficient array) onto the file in
read only mode
# Viewing it as a recarray means the attributes data.r and data.i are
acessible as
# ordinary numpy array
data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
print "First 100 real values:", data.r[:100]

--Slaunger


From google at mrabarnett.plus.com  Fri Feb  6 08:24:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 13:24:53 +0000
Subject: Question on Strings
In-Reply-To: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <498C3A25.8010605@mrabarnett.plus.com>

John Machin wrote:
 > On Feb 6, 9:24 pm, Chris Rebert <c... at rebertia.com> wrote:
 >> On Fri, Feb 6, 2009 at 1:49 AM, Kalyankumar Ramaseshan
 >>
 >> <soft_sm... at yahoo.com> wrote:
 >>
 >>> Hi,
 >>> Excuse me if this is a repeat question!
 >>> I just wanted to know how are strings represented in python?
 >>> I need to know in terms of:
 >>> a) Strings are stored as UTF-16 (LE/BE) or UTF-32 characters?
 >
 > Neither.
 >
 >> IIRC, Depends on what the build settings were when CPython was
 >> compiled. UTF-16 is the default.
 >
 > Unicode strings are held as arrays of 16-bit numbers or 32-bit numbers
 > [of which only 21 are used]. If you must use an acronym, use UCS-2 or
 > UCS-4.
 >
 > The UTF-n siblings are *external* representations.
 > 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
 > 3.x: an_str_object.decode('UTF-16') -> a_bytes_object
 >
 > By the way, has anyone come up with a name for the shifting effect
 > observed above on str, and also with repr, range, and the iter*
 > family? If not, I suggest that the language's association with the
 > best of English humour be widened so that it be dubbed the "Mad
 > Hatter's Tea Party" effect.
 >
Bitwise shifts and rotates are collectively referred to as skew
operations. I therefore suggest the term "skewing". :-)


From pc at p-cos.net  Fri Feb  6 08:32:21 2009
From: pc at p-cos.net (Pascal Costanza)
Date: Fri, 06 Feb 2009 14:32:21 +0100
Subject: programming by evolution?
In-Reply-To: <03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <6v2sf4Fhuh4mU1@mid.individual.net>

Xah Lee wrote:
> Pascal Constanza is a Common Lisp fanatic.

It's Costanza, not Constanza.


Thank you,
Pascal

-- 
ELS'09: http://www.european-lisp-symposium.org/
My website: http://p-cos.net
Common Lisp Document Repository: http://cdr.eurolisp.org
Closer to MOP & ContextL: http://common-lisp.net/project/closer/


From kdawg44 at gmail.com  Fri Feb  6 08:43:33 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Fri, 6 Feb 2009 08:43:33 -0500
Subject: WIn32api
Message-ID: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>

Hi,

I have a python script that I want to run in the system tray and system tray
only (windows system).  I am looking at the win32gui_taskbar.py demo file
but am having trouble making sense of what parts do.  I understand what the
whole does but I want to actually learn what it is doing so I can apply it,
not just copy and paste parts to make it work the way I want.

I have searched for some kind of explanation or tutorial on this and have
come up empty.  Is there anything out there?

Thanks.

Kevin
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From noama at answers.com  Fri Feb  6 08:56:03 2009
From: noama at answers.com (Noam Aigerman)
Date: Fri, 6 Feb 2009 15:56:03 +0200
Subject: Distributing simple tasks
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

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From mail at microcorp.co.za  Fri Feb  6 08:56:11 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 6 Feb 2009 15:56:11 +0200
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <002201c98862$ac137a60$0d00a8c0@hendrik>

"John Machin" <s..n at le..n.net> wrote:

>By the way, has anyone come up with a name for the shifting effect
>observed above on str, and also with repr, range, and the iter*
>family? If not, I suggest that the language's association with the
>best of English humour be widened so that it be dubbed the "Mad
>Hatter's Tea Party" effect.

The MHTP effect.

Sounds educated, almost like
a network protocol.

+1

- Hendrik





From traef at ebasedsecurity.com  Fri Feb  6 09:01:02 2009
From: traef at ebasedsecurity.com (Thomas Raef)
Date: Fri, 6 Feb 2009 08:01:02 -0600
Subject: Distributing simple tasks
Message-ID: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>

 

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

 

I would suggest maybe a separate queue machine that would hand out each
"next" function. That way if one machine takes a little longer, the
faster machine can keep picking off functions and running them, while
the slower machine can finish it's task.

 

Just a thought.

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From gh at ghaering.de  Fri Feb  6 09:01:20 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 06 Feb 2009 15:01:20 +0100
Subject: updating nntplib
In-Reply-To: <20090205224036.GH29170@subspacefield.org>
References: <20090205224036.GH29170@subspacefield.org>
Message-ID: <gmhfr4$la4$1@ger.gmane.org>

Travis wrote:
> Hello all,
> 
> There are some notable deficiencies in nntlib.  Here are two: [...]

Be sure to add a bug report/patch to the Python bug tracker.

http://bugs.python.org/

Anything else will most likely be overlooked or forgotten.

-- Gerhard



From noama at answers.com  Fri Feb  6 09:06:08 2009
From: noama at answers.com (Noam Aigerman)
Date: Fri, 6 Feb 2009 16:06:08 +0200
Subject: Distributing simple tasks
In-Reply-To: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>
References: <C4A2DDDA4F0A5C46A91AE25DD243546E08087A@ebs-2200.ebasedsecurity.local>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C00A91@jermail1.atomant.net>

Hi,

The delta between the finishing times of each machine is insignificant
compared to the actual runtime, thus I don't feel it's necessary at the
moment. Anyway, I want to keep it simple until I understand how to
distribute tasks J

Thanks!

 

From: Thomas Raef [mailto:traef at ebasedsecurity.com] 
Sent: Friday, February 06, 2009 4:01 PM
To: Noam Aigerman; python-list at python.org
Subject: RE: Distributing simple tasks

 

 

Hi,

Suppose I have an array of functions which I execute in threads (each
thread get a slice of the array, iterates over it and executes each
function in it's slice one after the other). Now I want to distribute
these tasks between two machines, i.e give each machine half of the
slices and let it run them in threads as described above. Is there an
easy way, or an article on this matter you can point me to?

Thanks, Noam

 

I would suggest maybe a separate queue machine that would hand out each
"next" function. That way if one machine takes a little longer, the
faster machine can keep picking off functions and running them, while
the slower machine can finish it's task.

 

Just a thought.

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From paul at subsignal.org  Fri Feb  6 09:28:15 2009
From: paul at subsignal.org (paul)
Date: Fri, 06 Feb 2009 15:28:15 +0100
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <mailman.8980.1233928765.3487.python-announce-list@python.org>
References: <mailman.8980.1233928765.3487.python-announce-list@python.org>
Message-ID: <gmhhd8$qcv$1@ger.gmane.org>

greg schrieb:
> SuPy 1.0
> --------
> 
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
Great, will give it a try.

> 
>   http://www.cosc.canterbury.ac.nz/SuPy/
I think you meant to write http://www.cosc.canterbury.ac.nz/~greg/SuPy/

> 
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.

cheers
  Paul




From mmcclaf at gmail.com  Fri Feb  6 09:30:57 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 06:30:57 -0800 (PST)
Subject: Using cPickle
Message-ID: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>

Hi there,

I have to make a small database using cPickle. I'm having troubles
trying to read in the information if it's more than one line. I'm
pretty sure it's in the line "for line in stuff:" Can anyone help me
out? Basically the end result is wanting it to look something like
what is down below when list is typed in:

Last name                 First Name                Email Address
Doe                          John
john at doe.com


[code]
# @author: Ocdt Murray McClafferty 24656
# This will manage a small database using the cPickle module.
# It must maintain a list of last names, first names and email
addresses, and must let a user interact with the program

#
#!usr/bin/python
# -*- coding: utf-8 -*-

import sys
import cPickle

#
format = '%s             %s                  %s'

try:
	filename = sys.argv[1]
	input = open(filename, 'r')

except IOError:
	print 'File is not available, will create a new file now'
	lastName='Last Name'
	firstName='First Name'
	email= 'Email'
	#input.close()
	output=open (filename, 'w')
	total = format%(lastName, firstName, email)
	cPickle.dump(total,output)
	#cPickle.dump(firstName,output)
	#cPickle.dump(email,output)
	output.close()
except EOFError:
	print 'File is empty'

#datas = cPickle.load(input)

while True:
	command=sys.stdin.readline()[:-1]
	if command=='list': #lists the data in the file
		input = open(filename, 'r')
		stuff=cPickle.load(input)
		for line in stuff:
			#firstName=cPickle.load(input)
			#email=cPickle.load(input)
			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
(email).rjust(20)
			stuff=cPickle.load(input)
			print stuff
			print line

		input.close()

	if command=='exit' or command=='quit' : #NEVER forget the exit!!!
		print 'Save changes? y for Yes, n for No'
		commandSave=sys.stdin.readline()[:-1]
		if commandSave =='y': #if the user wants to save
			output=open(filename, 'w')
			cPickle.dump(work,output)
			output.close()
			sys.exit(0)
		if commandSave =='n': #no save
			input.close()
			sys.exit(0)

	if command=='add': #adds an entity to the file
		print 'Last name?'
		lastName=sys.stdin.readline()[:-1]
		print 'First name?'
		firstName=sys.stdin.readline()[:-1]
		print 'Email address?'
		email=sys.stdin.readline()[:-1]
		work = format%(lastName, firstName, email)
		#output=open(filename, 'w')
		#data=cPickle.load(output)
		#data.append(work)
		#output.close()
		output=open(filename, 'a')
		cPickle.dump(work,output)
		output.close()

[/code]

All help would be appreciated. I am new to Python and this seems to be
quite a challenge for me.


From greywine at gmail.com  Fri Feb  6 09:36:00 2009
From: greywine at gmail.com (greywine at gmail.com)
Date: Fri, 6 Feb 2009 06:36:00 -0800 (PST)
Subject: self-aware list of objects able to sense constituent member 
	alterations?
References: <3043ae5c-0168-4249-8a21-63d0268b36f1@k36g2000pri.googlegroups.com>
	<mailman.8186.1233135479.3487.python-list@python.org>
Message-ID: <6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>

On Jan 28, 4:37?am, John O'Hagan <m... at johnohagan.com> wrote:
> On Tue, 27 Jan 2009, Reckoner wrote:
> > I'm not sure this is possible, but I would like to have
> > a list of ?objects
>
> > A=[a,b,c,d,...,z]
>
> > where, ?in the midst of a lot of processing I might do something like,
>
> > A[0].do_something_which_changes_the_properties()
>
> > which alter the properties of the object 'a'.
>
> > The trick is that I would like A to be mysteriously aware that
> > something about the ?object 'a' has changed so that when I revisit A,
> > I will know that the other items in the list need to be refreshed to
> > reflect the changes in A as a result of changing 'a'.
>
> > Even better would be to automatically percolate the subsequent changes
> > that resulted from altering 'a' for the rest of the items in the list.
>
> [...]
>
> Interesting question.
>
> Maybe this is too simple for your purpose (or maybe just wrong!), but could
> you subclass list and give it an "update" method which keeps a dictionary of
> the state of its members and/or calls another method that makes the
> appropriate changes in the other members when a change occurs, something
> like:
>
> class SelfAwareList(list):
>
> ? ? state_dict = {}
>
> ? ? def update(self):
> ? ? ? ? for i in self:
> ? ? ? ? ? ? if i.state == 'some_condition':
> ? ? ? ? ? ? ? ? self.do_stuff_to_other_members()
> ? ? ? ? ? ? self.state_dict[i] = i.state
>
> ? ? def do_stuff_to_other_members(self):
> ? ? ? ? print 'doing stuff...'
>
> ?
>
> You could manually call update() on the SelfAwareList instance after calling a
> method on a SelfAwareList member, or even build it into the members' methods
> so that it was automatic.
>
> HTH,
>
> John

Hi Reckoner & John O'Hagan,

Great thread, very interesting.

John, I haven't seen anything like your class that uses list instead
of object and refers to state directly (i.state in self).  Could you
elaborate?  Here would be my implementation of your idea:

class SelfAwareList2(object):

    def __init__(self, l):
        self.l = l
        self.changed = [False for element in l]

    def __str__(self):
        return str(self.l)

    def update(self, index, value):
        self.l[index] = value
        self.changed[index] = True

    def do_stuff_to_other_members(self):
        for i in self.changed:
            if i==False:
                self.l[i] += 1

Here you can print and whenever you update your list, self.changed
keeps track of what changed.  Later on you can call do_stuff_to_others
which in this case adds 1 to each other element.

I assume that your class replaces the awkwardness of l.update(0, 5)
with l[0] = 5, but I can't quite wrap my mind around it.

Luther.


From invalid at invalid  Fri Feb  6 09:48:23 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 06 Feb 2009 08:48:23 -0600
Subject: urllib2 performance on windows, usb connection
References: <gmgp38$m2s$00$1@news.t-online.com>
	<498beb5a$0$3305$9b622d9e@news.freenet.de>
Message-ID: <IvOdncBvN9Uq0BHUnZ2dnUVZ_t7inZ2d@posted.visi>

On 2009-02-06, Martin v. L?wis <martin at v.loewis.de> wrote:

> To investigate further, you might drop the write operating,
> and measure only source.read(). If that is slower, then, for
> some reason, the network speed is bad on Windows. Maybe you
> have the network interfaces misconfigured? Maybe you are using
> wireless on Windows, but cable on Linux? Maybe you have some
> network filtering software running on Windows?


> Maybe it's just that Windows sucks?-)

MAYBE?  

Good one.

A friend of mine signed up for 6MB/s DSL a while back.  She set
up the DSL modem/WAP/firewall according to QWest's instructions
and it basically worked, but her download speeds were much
slower than they should have been.  It turns out that the
Windows drivers for the Intel WiFi chipset used in many laptops
completely and utterly sucked.  Her laptop and my laptop used
the same WiFi chipset and neither could sustain more than about
1MB/s speeds when running Windows. I know my Windows setup was
running no firewall or virus scanner software.  Connecting to
the DSL modem via Ethernet cable brought the download speeds up
to 6MB/s.

When Linux was running on either laptop, the WiFi link ran at
full speed, and DSL was the bottleneck as it should have been.
Windows support was just plain broken for one of the most
popular WiFi chipsets (the Intel Pro 2200BG).

-- 
Grant Edwards                   grante             Yow! I'm wearing PAMPERS!!
                                  at               
                               visi.com            


From christian at dowski.com  Fri Feb  6 10:17:18 2009
From: christian at dowski.com (Christian)
Date: Fri, 6 Feb 2009 07:17:18 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org>
Message-ID: <acbbd3ba-66a3-4cb7-8e3b-d680f26d263d@a39g2000prl.googlegroups.com>

On Feb 1, 5:56 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> Is SQLalchemy the best / most popular database wrapper ?
> Are there any alternatives ?

As others have confirmed, SQLAlchemy is far and away the most popular
Python ORM.

Another one to have a look at though is Dejavu (http://www.aminus.net/
dejavu).  The user community isn't nearly as large but the software
itself is quite good.  One of its distinctives is that you can treat
multiple disparate data stores as one cohesive relational structure.
It also isn't bound to SQL databases.  There are storage
implementations included for file system, Shelve and in-memory
storage.  The 2.0 alpha code in trunk also has a memcached storage
implementation.

HTH,

Christian
http://www.dowski.com


From christian at dowski.com  Fri Feb  6 10:24:05 2009
From: christian at dowski.com (Christian)
Date: Fri, 6 Feb 2009 07:24:05 -0800 (PST)
Subject: database wrapper ?
References: <mailman.8544.1233528991.3487.python-list@python.org> 
	<acbbd3ba-66a3-4cb7-8e3b-d680f26d263d@a39g2000prl.googlegroups.com>
Message-ID: <a776fdff-cc61-464d-a4d9-73382cb5770c@s9g2000prg.googlegroups.com>

On Feb 6, 10:17 am, Christian <christ... at dowski.com> wrote:
> One of its distinctives is that ...

Not sure how I forgot this, but Dejavu also lets you write your
datastore queries in a LINQ-like syntax.  Robert Brewer, the author,
is giving a talk [1] about it at this year's PyCon in the US.

Christian
http://www.dowski.com

[1] http://pycon.org/2009/conference/talks/#proposal_link_91


From steve at holdenweb.com  Fri Feb  6 10:25:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 10:25:57 -0500
Subject: Using cPickle
In-Reply-To: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
Message-ID: <gmhkq7$a0m$1@ger.gmane.org>

mmcclaf wrote:
> Hi there,
> 
> I have to make a small database using cPickle. I'm having troubles
> trying to read in the information if it's more than one line. I'm
> pretty sure it's in the line "for line in stuff:" Can anyone help me
> out? Basically the end result is wanting it to look something like
> what is down below when list is typed in:
> 
> Last name                 First Name                Email Address
> Doe                          John
> john at doe.com
> 
> 
> [code]
> # @author: Ocdt Murray McClafferty 24656
> # This will manage a small database using the cPickle module.
> # It must maintain a list of last names, first names and email
> addresses, and must let a user interact with the program
> 
> #
> #!usr/bin/python
> # -*- coding: utf-8 -*-
> 
> import sys
> import cPickle
> 
> #
> format = '%s             %s                  %s'
> 
> try:
> 	filename = sys.argv[1]
> 	input = open(filename, 'r')
> 
> except IOError:
> 	print 'File is not available, will create a new file now'
> 	lastName='Last Name'
> 	firstName='First Name'
> 	email= 'Email'
> 	#input.close()
> 	output=open (filename, 'w')
> 	total = format%(lastName, firstName, email)
> 	cPickle.dump(total,output)
> 	#cPickle.dump(firstName,output)
> 	#cPickle.dump(email,output)
> 	output.close()
> except EOFError:
> 	print 'File is empty'
> 
> #datas = cPickle.load(input)
> 
> while True:
> 	command=sys.stdin.readline()[:-1]
> 	if command=='list': #lists the data in the file
> 		input = open(filename, 'r')
> 		stuff=cPickle.load(input)
> 		for line in stuff:
> 			#firstName=cPickle.load(input)
> 			#email=cPickle.load(input)
> 			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> (email).rjust(20)
> 			stuff=cPickle.load(input)
> 			print stuff
> 			print line
> 
> 		input.close()
> 
> 	if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> 		print 'Save changes? y for Yes, n for No'
> 		commandSave=sys.stdin.readline()[:-1]
> 		if commandSave =='y': #if the user wants to save
> 			output=open(filename, 'w')
> 			cPickle.dump(work,output)
> 			output.close()
> 			sys.exit(0)
> 		if commandSave =='n': #no save
> 			input.close()
> 			sys.exit(0)
> 
> 	if command=='add': #adds an entity to the file
> 		print 'Last name?'
> 		lastName=sys.stdin.readline()[:-1]
> 		print 'First name?'
> 		firstName=sys.stdin.readline()[:-1]
> 		print 'Email address?'
> 		email=sys.stdin.readline()[:-1]
> 		work = format%(lastName, firstName, email)
> 		#output=open(filename, 'w')
> 		#data=cPickle.load(output)
> 		#data.append(work)
> 		#output.close()
> 		output=open(filename, 'a')
> 		cPickle.dump(work,output)
> 		output.close()
> 
> [/code]
> 
> All help would be appreciated. I am new to Python and this seems to be
> quite a challenge for me.

Make sure you use modes "rb" and "wb" when you open the pickle files. If
you are running on Windows this can make a difference.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at spvi.com  Fri Feb  6 10:37:42 2009
From: steve at spvi.com (Steve Spicklemire)
Date: Fri, 6 Feb 2009 10:37:42 -0500
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <6v1u4pFho98dU1@mid.individual.net>
References: <6v1u4pFho98dU1@mid.individual.net>
Message-ID: <0179B31A-9FF1-46C9-990A-EB5F16EFB825@spvi.com>

Hi Greg,

Hm... "SuPy not found on this sever." ;-(

Is there a better URL.. or did I just check too soon?

thanks,
-steve

On Feb 5, 2009, at 11:56 PM, greg wrote:

> SuPy 1.0
> --------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
>
>   http://www.cosc.canterbury.ac.nz/SuPy/
>
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.
>
> -- 
> Greg Ewing
> greg.ewing at canterbury.ac.nz
> --
> http://mail.python.org/mailman/listinfo/python-announce-list
>
>        Support the Python Software Foundation:
>        http://www.python.org/psf/donations.html



From linuxguy123 at gmail.com  Fri Feb  6 10:49:04 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Fri, 06 Feb 2009 08:49:04 -0700
Subject: Object explorer for python ?
Message-ID: <1233935344.3876.9.camel@localhost.localdomain>

Is there a (stand alone ?) object explorer for python objects such as
the PyQt4 collection ?

How else could I find out what is in PyQt4.QtCore, .QtGui
and .QtWebKit ?

Thanks 



From benjamin.kaplan at case.edu  Fri Feb  6 10:55:09 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 6 Feb 2009 10:55:09 -0500
Subject: Python Power Point Slides
In-Reply-To: <gmh99r$unb$1@ger.gmane.org>
References: <4041891322e2bf49ab400664bc811fae@121.100.100.103>
	<gmh99r$unb$1@ger.gmane.org>
Message-ID: <ec96e1390902060755yc04434fv2c13558ed1dca89d@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:09 AM, Steve Holden <steve at holdenweb.com> wrote:

> Tehseen Siddiqui wrote:
> > ------------------------------------------------------------------------
> >
> > DISCLAIMER: The information in this email is confidential and may be
> > legally privileged. [... etc.]
>
> What information?



We can't tell you. It's confidential. :)
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From notvalid2 at sbcglobal.net  Fri Feb  6 11:01:54 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 06 Feb 2009 08:01:54 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8522.1233496608.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
	<mailman.8522.1233496608.3487.python-list@python.org>
Message-ID: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>

...
>>
> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
> point out that with the right search string you could have answered the
> question for yourself.
> 
> Since you didn't appear to know that Google allowed you to search a
> single site (something I perhaps take for granted) I am glad that point
> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
> Internet great? ;-)
> 
> regards
>  Steve
> 
Yes, I agree on the internet, and I now see "letme...com. So, I've now tried 
in my browser's link window:
site:effbot.org/tkinterbook tkfiledialog, and get "site is not a registered 
protocol."

If I put the "site:..." in the Google window,it works fine. In fact it's 
quite clever.

I thought some months ago, I found Google commands that would operate in the 
browser link window. Guess not.

BTW, isn't there an O'Reilly book on Google hacks of this sort? Where else 
does one find out about these Google tools?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From manu3d at gmail.com  Fri Feb  6 11:11:55 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 6 Feb 2009 08:11:55 -0800 (PST)
Subject: thread-local data
Message-ID: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>

Hi everybody,

Assuming a snippet such as:

threadLocalData = threading.local()
threadLocalData.myDictionary = self.myDictionary

is it correct to say that threadLocalData.myDictionary is NOT a thread-
local -copy- of self.myDictionary but it's actually pointing to the
same object?

If that's the case, and assuming I want to iterate over the dictionary
without it changing under my nose while I'm in the loop, would it be
better to encase the whole loop in lock-protected section or  would it
be better to make a copy of the dictionary first and then iterate over
that one? Given that in this particular thread I do not want to modify
the dictionary, conceptually a copy would work. But would making
thread-local copy be just as slow as making the whole loop thread
safe?

Thanks for your help!

Manu




From gherron at islandtraining.com  Fri Feb  6 11:27:14 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 06 Feb 2009 08:27:14 -0800
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <6v1u4pFho98dU1@mid.individual.net>
References: <6v1u4pFho98dU1@mid.individual.net>
Message-ID: <498C64E2.1050204@islandtraining.com>

greg wrote:
> SuPy 1.0
> --------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
>
>   http://www.cosc.canterbury.ac.nz/SuPy/


That URL fails with a 404 - not found.  (At least for me at this moment
in time.)


>
> This is a first version and is highly experimental. Let me
> know if it works for you and whether you have any problems.
>



From kdawg44 at gmail.com  Fri Feb  6 11:28:07 2009
From: kdawg44 at gmail.com (K-Dawg)
Date: Fri, 6 Feb 2009 11:28:07 -0500
Subject: WIn32api
In-Reply-To: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
References: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
Message-ID: <5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>

I have come up with what I need and will try tweaking some things that
hopefully will help me learn what some of this stuff does.  In the meantime,
I am having an issue:


class *KeepAlive*(threading.Thread):

    def *__init__*(*self*):

        *self*.count = 0

        *self*.ie=win32com.client.Dispatch(*'internetexplorer.application'*)

        *self*.ie.Visible=0

        threading.Thread.__init__(*self*)

    def *run*(*self*):

        *self*.ie.Navigate(URL)

        sleep(5)

        while True:

            sleep(1)

            *self*.count += 1

            *self*.timeLeft = str((300 - *self*.count)/60) + *":"* + str((
300 - *self*.count)%60) + *" until next refresh"
*

            print *self*.timeLeft

            if *self*.count == 300:

                *self*.ie.Refresh()

                *self*.count = 0



This works if I call run() specifically.  But when I try to initiate the
thread with .start() I get the following error

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 486, in __bootstrap_inner
    self.run()
  File "C:\app.py", line 104, in run
    self.ie.Navigate(URL)
  File "C:\Python25\lib\site-packages\win32com\client\dynamic.py", line 500,
in
__getattr__
    raise AttributeError, "%s.%s" % (self._username_, attr)
AttributeError: internetexplorer.application.Navigate

What does this mean?  Why is it only happening when I am trying to do this
in a thread?

Thanks for any help.



Kevin
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From kyosohma at gmail.com  Fri Feb  6 11:30:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 6 Feb 2009 08:30:26 -0800 (PST)
Subject: Object explorer for python ?
References: <mailman.8987.1233935355.3487.python-list@python.org>
Message-ID: <fc54b384-a753-40fa-a24e-3a3e53366588@q30g2000prq.googlegroups.com>

On Feb 6, 9:49?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> Is there a (stand alone ?) object explorer for python objects such as
> the PyQt4 collection ?
>
> How else could I find out what is in PyQt4.QtCore, .QtGui
> and .QtWebKit ?
>
> Thanks

I like WingWare for this sort of thing, but you might like eric. Links
are below:

http://eric-ide.python-projects.org/index.html
http://www.wingware.com/

Other editors: http://wiki.python.org/moin/PythonEditors

Mike


From google at mrabarnett.plus.com  Fri Feb  6 11:45:07 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 16:45:07 +0000
Subject: Tkinter w.pack()?
In-Reply-To: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
Message-ID: <498C6913.6020201@mrabarnett.plus.com>

W. eWatson wrote:
> ...
>>>
>> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
>> point out that with the right search string you could have answered the
>> question for yourself.
>>
>> Since you didn't appear to know that Google allowed you to search a
>> single site (something I perhaps take for granted) I am glad that point
>> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
>> Internet great? ;-)
>>
>> regards
>>  Steve
>>
> Yes, I agree on the internet, and I now see "letme...com. So, I've now 
> tried in my browser's link window:
> site:effbot.org/tkinterbook tkfiledialog, and get "site is not a 
> registered protocol."
> 
> If I put the "site:..." in the Google window,it works fine. In fact it's 
> quite clever.
> 
> I thought some months ago, I found Google commands that would operate in 
> the browser link window. Guess not.
> 
> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where 
> else does one find out about these Google tools?
> 
Google? :-)

http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861



From google at mrabarnett.plus.com  Fri Feb  6 11:56:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 16:56:40 +0000
Subject: thread-local data
In-Reply-To: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
Message-ID: <498C6BC8.5020103@mrabarnett.plus.com>

Emanuele D'Arrigo wrote:
 > Hi everybody,
 >
 > Assuming a snippet such as:
 >
 > threadLocalData = threading.local()
 > threadLocalData.myDictionary = self.myDictionary
 >
 > is it correct to say that threadLocalData.myDictionary is NOT a thread-
 > local -copy- of self.myDictionary but it's actually pointing to the
 > same object?
 >
 > If that's the case, and assuming I want to iterate over the dictionary
 > without it changing under my nose while I'm in the loop, would it be
 > better to encase the whole loop in lock-protected section or  would it
 > be better to make a copy of the dictionary first and then iterate over
 > that one? Given that in this particular thread I do not want to modify
 > the dictionary, conceptually a copy would work. But would making
 > thread-local copy be just as slow as making the whole loop thread
 > safe?
 >
It depends on how long it takes to iterate over the dict compared with
how long it takes to copy the dict. Other threads will/should be denied
access during the iteration/copying and therefore block, reducing
throughput.

I'd probably use the snapshot approach (take a copy).


From steve at holdenweb.com  Fri Feb  6 12:32:14 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 06 Feb 2009 12:32:14 -0500
Subject: Tkinter w.pack()?
In-Reply-To: <u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
Message-ID: <gmhs70$65r$1@ger.gmane.org>

W. eWatson wrote:
> ...
>>>
>> The use of "letmegooglethatforyou" (not my video tool, by the way) is to
>> point out that with the right search string you could have answered the
>> question for yourself.
>>
>> Since you didn't appear to know that Google allowed you to search a
>> single site (something I perhaps take for granted) I am glad that point
>> wasn't lost. Yes, you can just search the PIL documentation. Isn't the
>> Internet great? ;-)
>>
>> regards
>>  Steve
>>
> Yes, I agree on the internet, and I now see "letme...com. So, I've now
> tried in my browser's link window:
> site:effbot.org/tkinterbook tkfiledialog, and get "site is not a
> registered protocol."
> 
> If I put the "site:..." in the Google window,it works fine. In fact it's
> quite clever.
> 
> I thought some months ago, I found Google commands that would operate in
> the browser link window. Guess not.
> 
> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where
> else does one find out about these Google tools?
> 
I seem to pick them up as I go along. This group is actually a great
source of google-fu enhancements - I believe this is where I found out
about "letmegooglethatforyou".

Of course you can do any Google search and then look at what Google puts
in your Location: bar. Saving that URL means you can repeat the same
search later, but you can also analyze it to find out about some useful
tricks (and "letme..." uses the same everything except for the domain
name). So your site search would also work with

  http://www.google.com/search?q=site%3Aeffbot.org+tkinterbook%2Bpack

Of course it would be relatively easy to write a Python program that
used the browser module to do this kind of search ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From richardlev at gmail.com  Fri Feb  6 12:47:06 2009
From: richardlev at gmail.com (Richard Levasseur)
Date: Fri, 6 Feb 2009 09:47:06 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8894.1233849778.3487.python-list@python.org>
Message-ID: <e3215748-2e10-4a32-91ed-ae8b959b46b6@u18g2000pro.googlegroups.com>

On Feb 5, 8:02?am, Dan Upton <up... at virginia.edu> wrote:
> On Thu, Feb 5, 2009 at 11:00 AM, mk <mrk... at gmail.com> wrote:
>
> > (duck)
>
> > 542 comp.lang.python rtfm
>
> > 467 comp.lang.python shut+up
>
> > 263 comp.lang.perl rtfm
>
> > 45 comp.lang.perl shut+up
>
> But over how many messages for each group? ?Wouldn't the percentage of
> messages containing those be more interesting than the raw number? ;p

As would the percent of threads that ultimately have "GIL" within the
last, oh, say 20% of their messages :)


From deets at nospam.web.de  Fri Feb  6 13:12:18 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:12:18 +0100
Subject: thread-local data
In-Reply-To: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
Message-ID: <6v3cs2Fhovi8U1@mid.uni-berlin.de>

Emanuele D'Arrigo schrieb:
> Hi everybody,
> 
> Assuming a snippet such as:
> 
> threadLocalData = threading.local()
> threadLocalData.myDictionary = self.myDictionary
> 
> is it correct to say that threadLocalData.myDictionary is NOT a thread-
> local -copy- of self.myDictionary but it's actually pointing to the
> same object?

Yes, it's pointing to the same object, and it thus makes the whole 
purpose of threadlocal moot. Use a global.

 > If that's the case, and assuming I want to iterate over the dictionary
 > without it changing under my nose while I'm in the loop, would it be
 > better to encase the whole loop in lock-protected section or  would it
 > be better to make a copy of the dictionary first and then iterate over
 > that one? Given that in this particular thread I do not want to modify
 > the dictionary, conceptually a copy would work. But would making
 > thread-local copy be just as slow as making the whole loop thread
 > safe?

As MRAB pointed out - it depends. My gut feeling on this is that the 
copy-approach is fastest. Or even faster, if you can cope with keys 
getting lost while processing them:


for key in self.myDictionary.keys():
     try:
        value = self.myDictionary[key]
     except KeyError:
        pass


Diez


From deets at nospam.web.de  Fri Feb  6 13:13:05 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:13:05 +0100
Subject: thread-local data
In-Reply-To: <6v3cs2Fhovi8U1@mid.uni-berlin.de>
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
	<6v3cs2Fhovi8U1@mid.uni-berlin.de>
Message-ID: <6v3ctiFhovi8U2@mid.uni-berlin.de>

Diez B. Roggisch schrieb:
> Emanuele D'Arrigo schrieb:
>> Hi everybody,
>>
>> Assuming a snippet such as:
>>
>> threadLocalData = threading.local()
>> threadLocalData.myDictionary = self.myDictionary
>>
>> is it correct to say that threadLocalData.myDictionary is NOT a thread-
>> local -copy- of self.myDictionary but it's actually pointing to the
>> same object?
> 
> Yes, it's pointing to the same object, and it thus makes the whole 
> purpose of threadlocal moot. Use a global.

Scratch the "use a global" - that's of course nonsense. Use 
self.myDictionary directly, or wherever the dict comes from.

Diez


From tjreedy at udel.edu  Fri Feb  6 13:23:11 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:23:11 -0500
Subject: Question on Strings
In-Reply-To: <0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com>
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
Message-ID: <gmhv6f$f7b$1@ger.gmane.org>

John Machin wrote:

> The UTF-n siblings are *external* representations.
> 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
> 3.x: an_str_object.decode('UTF-16') -> a_bytes_object

That should be .encode() to bytes, which is the coded form.
.decode is bytes => str/unicode



From tjreedy at udel.edu  Fri Feb  6 13:30:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:30:57 -0500
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <gmhvl1$h8f$1@ger.gmane.org>

Ken Elkabany wrote:
> Hello,
> 
> I am attempting to fully-simulate an 'int' object with a custom object 
> type. It is part of a library I am creating for python futures and 
> promises. Is there anyway such that type(my_object) can return <type 
> 'int'>? Or for that matter, any other primitive? I do not care how dirty 
> the solution might possibly be; Could there be a way through the C API? 
> Though I predict it will cause a mess with the interpreter.

type(o) == o.__class__

o.__class__ can only be rebound if and only if it is a user-class (heap 
type) and then only to another (compatible) user-class (heap type).



From deets at nospam.web.de  Fri Feb  6 13:31:10 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:31:10 +0100
Subject: i have an query regarding pyodbc
In-Reply-To: <519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>
References: <4f9834b0-98cd-486c-b91e-a6cab4d8744f@b38g2000prf.googlegroups.com>
	<ea83a6e5-008b-4234-8816-743a479c7d68@40g2000prx.googlegroups.com>
	<519d4dd8-c9b0-44ed-bad1-5df96adf1ea7@x16g2000prn.googlegroups.com>
Message-ID: <6v3dveFhtbfjU1@mid.uni-berlin.de>

Rahul schrieb:
> On Feb 6, 3:53 pm, Rahul <r.warhe... at gmail.com> wrote:
>> On Feb 6, 11:27 am, Rahul <r.warhe... at gmail.com> wrote:
>>
>>
>>
>>> hello all,
>>> I have installed pyodbc on my red hat enterprise 4 linux machine but
>>> when i go to use that using statement,
>>> import pyodbc
>>> through python console it gives me error as
>>> ImportError : dynamic module does not define init function
>>> (initpyodbc)
>>> and when i do 'nm pyodbc.so' command i get output as
>>> [root at dbserver site-packages]# nm pyodbc.so 00001600 A __bss_start
>>> 000003ec t call_gmon_start 00001600 b completed.1 000014fc d
>>> __CTOR_END__
>>> 000014f8 d __CTOR_LIST__
>>>          w __cxa_finalize@@GLIBC_2.1.3
>>> 000004a8 t __do_global_ctors_aux
>>> 00000410 t __do_global_dtors_aux
>>> 000015f8 d __dso_handle
>>> 00001504 d __DTOR_END__
>>> 00001500 d __DTOR_LIST__
>>> 0000150c A _DYNAMIC
>>> 00001600 A _edata
>>> 00001604 A _end
>>> 000004d8 T _fini
>>> 0000046c t frame_dummy
>>> 000004f4 r __FRAME_END__
>>> 000015e8 A _GLOBAL_OFFSET_TABLE_
>>>          w __gmon_start__
>>> 000003b4 T _init
>>> 00001508 d __JCR_END__
>>> 00001508 d __JCR_LIST__
>>>          w _Jv_RegisterClasses
>>> 000015fc d p.0
>>> which means there is no init function.
>>> So what might be the cause for that?
>>> I have build that pyodbc twice.
>>> Any help regarding this will be greatly appreciated.
>>> Thanks & Regards
>>> Rahul
>> this problem was due to not proper building of pyodbc
> 
> Now my problem was,
> i have two versions of python installed at different locations but
> when i use import statement from psp pages
> it displays the error as
> ImportError : dynamic module does not define init function(initpyodbc)
> 
> this error was due to pointing to older version of python.
> 
> So, i want to know how to point my import statements to the new
> version of python.

The problem are not the imports, the problem is the used interpreter. 
How is PSP integrated into your webserver?

Diez


From Scott.Daniels at Acm.Org  Fri Feb  6 13:36:37 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 06 Feb 2009 10:36:37 -0800
Subject: What is difference between ADO and RDO
In-Reply-To: <a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
	<a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com>
Message-ID: <dO2dnZHZepddHxHUnZ2dnUVZ_qadnZ2d@pdx.net>

OdarR wrote:
> On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
>> Explain ADO and RDO
> 
> RU a bot ?

I expect someone is experimenting with their spam generator.


From deets at nospam.web.de  Fri Feb  6 13:42:36 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 19:42:36 +0100
Subject: Have you ever thought to know your intelligence level?
In-Reply-To: <1f832722-d2f1-4596-a27c-69e666bbf6cd@y38g2000prg.googlegroups.com>
References: <29506468-3b1d-46c0-acba-15c4d5665954@x6g2000pre.googlegroups.com>
	<8f4ff01d-7660-4d71-b812-acb5acfb4671@u18g2000pro.googlegroups.com>
	<1f832722-d2f1-4596-a27c-69e666bbf6cd@y38g2000prg.googlegroups.com>
Message-ID: <6v3eksFhv2c3U1@mid.uni-berlin.de>

> 
> His IQ must suck considering all the spelling errors....or is that not
> also a measure of one's IQ?

I'm pretty sure there is a legasthenic nobel prize winner out there... 
so *if* it were a measure of IQ, it would make the whole affair even 
more braindead.

I'd rather say he is of limited intelligence because he tries to 
convince us that his spam actually *isn't* spam...

Diez


From tjreedy at udel.edu  Fri Feb  6 13:49:32 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:49:32 -0500
Subject: Distributing simple tasks
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
Message-ID: <gmi0nt$l9v$1@ger.gmane.org>

Noam Aigerman wrote:
> Hi,
> 
> Suppose I have an array of functions which I execute in threads (each 
> thread get a slice of the array, iterates over it and executes each 
> function in it?s slice one after the other). Now I want to distribute 
> these tasks between two machines, i.e give each machine half of the 
> slices and let it run them in threads as described above. Is there an 
> easy way, or an article on this matter you can point me to?

Here is a standard  approach that is slightly more general than you 
specified.  It will work with more than two cores or machines.

Write master/server program that reads data, listens to socket for calls 
from worker/client programs, splits work into multiple tasks, sends them 
out to workers, and collects and re-assembles the results.  After a 
timeout, it should be able to reassign tasks not returned.

Write worker/client program than calls master, gets task, completes it, 
and returns result.

Assume all data is on machine A.
Start master and worker on machine A.
Start worker(s) on other cores or machines.

You can either use socket module directly or use networking modules 
built on top of it.  Twisted and pyro are two that come to mind 
immediately.  I have seen code examples but do not remember where.

Note: I do not see any advantage to having multiple compute-bound 
threads, as you seem to describe.

Terry Jan Reedy



From aioe.org at technicalbloke.com  Fri Feb  6 13:50:05 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Fri, 06 Feb 2009 13:50:05 -0500
Subject: Returning a variable number of things...
Message-ID: <gmi0og$4cl$1@aioe.org>

Hi There,

I have a function that uses *args to accept a variable number of
parameters and I would like it to return a variable number of objects.

I could return a list but I would like to take advantage of tuple
unpacking with the return values e.g.

def unpack_struct( a_string, *args ):
  output_vars = []
  for each in *args:
    <<< build a list of output values >>>
  return <<< the tuple equivalent of this list >>>

ip, meat, zipcode = unpack_struct( "192.168.001.001Ham22132", 15, 3, 5 )

Thanks,


Roger.


From tjreedy at udel.edu  Fri Feb  6 13:54:07 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 13:54:07 -0500
Subject: updating nntplib
In-Reply-To: <gmhfr4$la4$1@ger.gmane.org>
References: <20090205224036.GH29170@subspacefield.org>
	<gmhfr4$la4$1@ger.gmane.org>
Message-ID: <gmi10g$m5c$1@ger.gmane.org>

Gerhard H?ring wrote:
> Travis wrote:
>> Hello all,
>>
>> There are some notable deficiencies in nntlib.  Here are two: [...]
> 
> Be sure to add a bug report/patch to the Python bug tracker.
> 
> http://bugs.python.org/
> 
> Anything else will most likely be overlooked or forgotten.

It is my impression that nntplib was and maybe still is a bit flakey on 
3.0.  3.0.1 will be out this month and may or may not have improvements. 
  I am fairly sure that updating it to a newer RFC would be welcome. 
Such upgrades have happened to other protocol modules when there has 
been someone willing to do the work.  Please do check the tracker for 
existing nntplib issues and add one if appropriate.

tjr



From clp2 at rebertia.com  Fri Feb  6 13:57:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 10:57:10 -0800
Subject: Returning a variable number of things...
In-Reply-To: <gmi0og$4cl$1@aioe.org>
References: <gmi0og$4cl$1@aioe.org>
Message-ID: <50697b2c0902061057h32ae0aes12ae96cad54cde6f@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:
> Hi There,
>
> I have a function that uses *args to accept a variable number of
> parameters and I would like it to return a variable number of objects.
>
> I could return a list but I would like to take advantage of tuple
> unpacking with the return values e.g.

Despite its name, tuple unpacking works with lists too.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From apt.shansen at gmail.com  Fri Feb  6 13:57:45 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 10:57:45 -0800
Subject: Returning a variable number of things...
In-Reply-To: <gmi0og$4cl$1@aioe.org>
References: <gmi0og$4cl$1@aioe.org>
Message-ID: <7a9c25c20902061057h251c459eg43d7ffd906996d9c@mail.gmail.com>

On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:

> Hi There,
>
> I have a function that uses *args to accept a variable number of
> parameters and I would like it to return a variable number of objects.
>

> I could return a list but I would like to take advantage of tuple
> unpacking with the return values e.g.


Just return the list :)

It'll unpack any sequence, not just tuples.

--S
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From mmcclaf at gmail.com  Fri Feb  6 14:05:36 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 11:05:36 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
Message-ID: <4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>

On Feb 6, 10:25?am, Steve Holden <st... at holdenweb.com> wrote:
> mmcclaf wrote:
> > Hi there,
>
> > I have to make a small database using cPickle. I'm having troubles
> > trying to read in the information if it's more than one line. I'm
> > pretty sure it's in the line "for line in stuff:" Can anyone help me
> > out? Basically the end result is wanting it to look something like
> > what is down below when list is typed in:
>
> > Last name ? ? ? ? ? ? ? ? First Name ? ? ? ? ? ? ? ?Email Address
> > Doe ? ? ? ? ? ? ? ? ? ? ? ? ?John
> > j... at doe.com
>
> > [code]
> > # @author: Ocdt Murray McClafferty 24656
> > # This will manage a small database using the cPickle module.
> > # It must maintain a list of last names, first names and email
> > addresses, and must let a user interact with the program
>
> > #
> > #!usr/bin/python
> > # -*- coding: utf-8 -*-
>
> > import sys
> > import cPickle
>
> > #
> > format = '%s ? ? ? ? ? ? %s ? ? ? ? ? ? ? ? ?%s'
>
> > try:
> > ? ?filename = sys.argv[1]
> > ? ?input = open(filename, 'r')
>
> > except IOError:
> > ? ?print 'File is not available, will create a new file now'
> > ? ?lastName='Last Name'
> > ? ?firstName='First Name'
> > ? ?email= 'Email'
> > ? ?#input.close()
> > ? ?output=open (filename, 'w')
> > ? ?total = format%(lastName, firstName, email)
> > ? ?cPickle.dump(total,output)
> > ? ?#cPickle.dump(firstName,output)
> > ? ?#cPickle.dump(email,output)
> > ? ?output.close()
> > except EOFError:
> > ? ?print 'File is empty'
>
> > #datas = cPickle.load(input)
>
> > while True:
> > ? ?command=sys.stdin.readline()[:-1]
> > ? ?if command=='list': #lists the data in the file
> > ? ? ? ? ? ?input = open(filename, 'r')
> > ? ? ? ? ? ?stuff=cPickle.load(input)
> > ? ? ? ? ? ?for line in stuff:
> > ? ? ? ? ? ? ? ? ? ?#firstName=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?#email=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> > (email).rjust(20)
> > ? ? ? ? ? ? ? ? ? ?stuff=cPickle.load(input)
> > ? ? ? ? ? ? ? ? ? ?print stuff
> > ? ? ? ? ? ? ? ? ? ?print line
>
> > ? ? ? ? ? ?input.close()
>
> > ? ?if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> > ? ? ? ? ? ?print 'Save changes? y for Yes, n for No'
> > ? ? ? ? ? ?commandSave=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?if commandSave =='y': #if the user wants to save
> > ? ? ? ? ? ? ? ? ? ?output=open(filename, 'w')
> > ? ? ? ? ? ? ? ? ? ?cPickle.dump(work,output)
> > ? ? ? ? ? ? ? ? ? ?output.close()
> > ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> > ? ? ? ? ? ?if commandSave =='n': #no save
> > ? ? ? ? ? ? ? ? ? ?input.close()
> > ? ? ? ? ? ? ? ? ? ?sys.exit(0)
>
> > ? ?if command=='add': #adds an entity to the file
> > ? ? ? ? ? ?print 'Last name?'
> > ? ? ? ? ? ?lastName=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?print 'First name?'
> > ? ? ? ? ? ?firstName=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?print 'Email address?'
> > ? ? ? ? ? ?email=sys.stdin.readline()[:-1]
> > ? ? ? ? ? ?work = format%(lastName, firstName, email)
> > ? ? ? ? ? ?#output=open(filename, 'w')
> > ? ? ? ? ? ?#data=cPickle.load(output)
> > ? ? ? ? ? ?#data.append(work)
> > ? ? ? ? ? ?#output.close()
> > ? ? ? ? ? ?output=open(filename, 'a')
> > ? ? ? ? ? ?cPickle.dump(work,output)
> > ? ? ? ? ? ?output.close()
>
> > [/code]
>
> > All help would be appreciated. I am new to Python and this seems to be
> > quite a challenge for me.
>
> Make sure you use modes "rb" and "wb" when you open the pickle files. If
> you are running on Windows this can make a difference.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

I've tried both rb and wb as well as r and w, there appears to be no
difference in the running of the code.


From Olivier.Darge at gmail.com  Fri Feb  6 14:13:32 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Fri, 6 Feb 2009 11:13:32 -0800 (PST)
Subject: What is difference between ADO and RDO
References: <0f03c29f-04df-433b-8ea9-01be1acfa7cf@v39g2000pro.googlegroups.com>
	<a84a25af-7cd3-4776-a12e-9228dec0b7ac@g39g2000pri.googlegroups.com> 
	<dO2dnZHZepddHxHUnZ2dnUVZ_qadnZ2d@pdx.net>
Message-ID: <23ea9cc9-78d0-46d8-be1f-6dcd959c6b04@p36g2000prp.googlegroups.com>

On 6 f?v, 19:36, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> OdarR wrote:
> > On 6 f?v, 10:56, Agile Consulting <agile.scrapp... at gmail.com> wrote:
> >> Explain ADO and RDO
>
> > RU a bot ?
>
> I expect someone is experimenting with their spam generator.

An agile one :)

Olivier


From wimmersimon at googlemail.com  Fri Feb  6 14:34:58 2009
From: wimmersimon at googlemail.com (SiWi)
Date: Fri, 6 Feb 2009 11:34:58 -0800 (PST)
Subject: Parallel port interfacing in python on Vista x64
Message-ID: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>

I have done some googling on this topic, but I haven't found anything
thats really working on Vista x64.
The most promising result I found was the Inpout32.dll:
http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html
But when using some code like that, I can't measure I differing state
on my breadboard circurity:
from ctypes import windll
p = windll.inpout32
p.Inp32(0x378) #default 255(all high) on my pc
p.Out32(0x378, 0) #put all low on port 2-9

Is it even possible to interface the Parallel Port on Vista64, and if
so, how does one do that?


From otsaloma at cc.hut.fi  Fri Feb  6 14:39:51 2009
From: otsaloma at cc.hut.fi (Osmo Salomaa)
Date: Fri, 06 Feb 2009 21:39:51 +0200
Subject: Installation directory for extensions on Unix
Message-ID: <1233949191.3825.9.camel@stoa.kyla.fi>

I have written an extension (a.k.a. plugin or add-on, not C-extension)
system for my application and I'm going to ship two extensions with it.
Each extension is in a directory of its own and that directory contains
Python files and various data files, e.g. Glade XML files and PNG icons.

Where should I install these extension directories on a Unix system?
$PREFIX/share/foo or $PREFIX/lib/foo? How do I handle compiling with
distutils if installing Python code outside the default site-packages
directory?

Importing these extensions is handled by listing the contents of the
extension directory and using __import__ on the specified files, so the
installation directory does not need to be anywhere near $PYTHONPATH.

-- 
Osmo Salomaa <otsaloma at cc.hut.fi>



From thudfoo at opensuse.us  Fri Feb  6 14:48:18 2009
From: thudfoo at opensuse.us (member thudfoo)
Date: Fri, 6 Feb 2009 11:48:18 -0800
Subject: ANN: SuPy - Script Sketchup with Python
In-Reply-To: <498C64E2.1050204@islandtraining.com>
References: <6v1u4pFho98dU1@mid.individual.net>
	<498C64E2.1050204@islandtraining.com>
Message-ID: <3d881a310902061148k251466eay57562acb1d51c812@mail.gmail.com>

On Fri, Feb 6, 2009 at 8:27 AM, Gary Herron <gherron at islandtraining.com> wrote:
> greg wrote:
>> SuPy 1.0
>> --------
>>
>> SuPy is a plugin for the Sketchup 3D modelling application
>> that lets you script it in Python.
>>
>>   http://www.cosc.canterbury.ac.nz/SuPy/
>
>
> That URL fails with a 404 - not found.  (At least for me at this moment
> in time.)
>
>
>>
>> This is a first version and is highly experimental. Let me
>> know if it works for you and whether you have any problems.
>>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

This URL works:

http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/


From manu3d at gmail.com  Fri Feb  6 14:53:44 2009
From: manu3d at gmail.com (Emanuele D'Arrigo)
Date: Fri, 6 Feb 2009 11:53:44 -0800 (PST)
Subject: thread-local data
References: <73694758-4504-46ca-903c-555b16a2e2a5@y23g2000pre.googlegroups.com>
	<6v3cs2Fhovi8U1@mid.uni-berlin.de> <6v3ctiFhovi8U2@mid.uni-berlin.de>
Message-ID: <707009a2-33d7-48f9-bf0d-0c7e13e19f94@a12g2000pro.googlegroups.com>

Thank you both MRAB and Diez.

I think I'll stick to making copies inside a thread-protected section
unless I need to speed up things, at which point I might go for the
key exception path.

Thank you again!

Manu






From deets at nospam.web.de  Fri Feb  6 14:55:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Fri, 06 Feb 2009 20:55:43 +0100
Subject: Parallel port interfacing in python on Vista x64
In-Reply-To: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
References: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
Message-ID: <6v3iu0Fi5knrU1@mid.uni-berlin.de>

SiWi schrieb:
> I have done some googling on this topic, but I haven't found anything
> thats really working on Vista x64.
> The most promising result I found was the Inpout32.dll:
> http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html
> But when using some code like that, I can't measure I differing state
> on my breadboard circurity:
> from ctypes import windll
> p = windll.inpout32
> p.Inp32(0x378) #default 255(all high) on my pc
> p.Out32(0x378, 0) #put all low on port 2-9
> 
> Is it even possible to interface the Parallel Port on Vista64, and if
> so, how does one do that?

Did you try pyparallel?


Diez


From curt.hash at gmail.com  Fri Feb  6 15:03:23 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 13:03:23 -0700
Subject: Fastest database solution
In-Reply-To: <gmguue$uj4$1@ger.gmane.org>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
	<gmguue$uj4$1@ger.gmane.org>
Message-ID: <736698790902061203p7fa5f22cw982e70876b4745c6@mail.gmail.com>

On Fri, Feb 6, 2009 at 2:12 AM, Roger Binns <rogerb at rogerbinns.com> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Curt Hash wrote:
> > I started out using sqlite3, but was not satisfied with the performance
> > results. I then tried using psycopg2 with a local postgresql server, and
> > the performance got even worse.
>
> SQLite is in the same process.  Communication with postgres is via
> another process so marshalling the traffic and context switches will
> impose overhead as you found.
>
> > I don't think
> > my code/queries are inherently slow, but I'm not a DBA or a very
> > accomplished Python developer, so I could be wrong.
>
> It doesn't sound like a database is the best solution to your issue
> anyway.  A better solution would likely be some form of hashing the
> lines and storing something that gives quick hash lookups.  The hash
> would have to do things like not care what variable names are used etc.
>
> There are already lots of plagiarism detectors out there so it may be
> more prudent using one of them, or at least learn how they do things so
> your own system could improve on them.

Currently, I am stripping extra whitespace and end-of-line characters
from each line of source code and storing that in addition to its hash
in a table. That table is used for exact-match comparisons. I am also
passing the source code through flex/bison to canonicalize identifiers
-- the resulting lines are also hashed and stored in a table. That
table is used for structural matching. Both tables are queried to find
matching hashes. I'm not sure how I could make the hash lookups
faster...

On my small test dataset, this solution has detected all of the
plagiarism with high confidence.

It's also beneficial to me to use this Python application as I can
easily integrate it with other Python scripts I use to prepare code
for review.

>
> Roger
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
>
> iEYEARECAAYFAkmL/wgACgkQmOOfHg372QTAmACg0INMfUKA10Uc6UJwNhYhDeoV
> EKwAoKpDMRzr7GzCKeYxn93TU69nDx4X
> =4r01
> -----END PGP SIGNATURE-----
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From wimmersimon at googlemail.com  Fri Feb  6 15:03:50 2009
From: wimmersimon at googlemail.com (SiWi)
Date: Fri, 6 Feb 2009 12:03:50 -0800 (PST)
Subject: Parallel port interfacing in python on Vista x64
References: <162a8d2c-04a6-4b26-a36c-48a638f72349@r15g2000prd.googlegroups.com>
	<6v3iu0Fi5knrU1@mid.uni-berlin.de>
Message-ID: <2aa2e6d0-b217-4f76-912c-240511505c12@g1g2000pra.googlegroups.com>

On Feb 6, 8:55?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> SiWi schrieb:
>
> > I have done some googling on this topic, but I haven't found anything
> > thats really working on Vista x64.
> > The most promising result I found was the Inpout32.dll:
> >http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_...
> > But when using some code like that, I can't measure I differing state
> > on my breadboard circurity:
> > from ctypes import windll
> > p = windll.inpout32
> > p.Inp32(0x378) #default 255(all high) on my pc
> > p.Out32(0x378, 0) #put all low on port 2-9
>
> > Is it even possible to interface the Parallel Port on Vista64, and if
> > so, how does one do that?
>
> Did you try pyparallel?
>
> Diez

Yep, but when trying to make a instance of the Parallel class I get an
windows error.


From google at mrabarnett.plus.com  Fri Feb  6 15:09:03 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 20:09:03 +0000
Subject: Using cPickle
In-Reply-To: <4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
Message-ID: <498C98DF.5080507@mrabarnett.plus.com>

mmcclaf wrote:
> On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
>> mmcclaf wrote:
>>> Hi there,
>>> I have to make a small database using cPickle. I'm having troubles
>>> trying to read in the information if it's more than one line. I'm
>>> pretty sure it's in the line "for line in stuff:" Can anyone help me
>>> out? Basically the end result is wanting it to look something like
>>> what is down below when list is typed in:
>>> Last name                 First Name                Email Address
>>> Doe                          John
>>> j... at doe.com
>>> [code]
>>> # @author: Ocdt Murray McClafferty 24656
>>> # This will manage a small database using the cPickle module.
>>> # It must maintain a list of last names, first names and email
>>> addresses, and must let a user interact with the program
>>> #
>>> #!usr/bin/python
>>> # -*- coding: utf-8 -*-
>>> import sys
>>> import cPickle
>>> #
>>> format = '%s             %s                  %s'
>>> try:
>>>    filename = sys.argv[1]
>>>    input = open(filename, 'r')
>>> except IOError:
>>>    print 'File is not available, will create a new file now'
>>>    lastName='Last Name'
>>>    firstName='First Name'
>>>    email= 'Email'
>>>    #input.close()
>>>    output=open (filename, 'w')
>>>    total = format%(lastName, firstName, email)
>>>    cPickle.dump(total,output)
>>>    #cPickle.dump(firstName,output)
>>>    #cPickle.dump(email,output)
>>>    output.close()
>>> except EOFError:
>>>    print 'File is empty'
>>> #datas = cPickle.load(input)
>>> while True:
>>>    command=sys.stdin.readline()[:-1]
>>>    if command=='list': #lists the data in the file
>>>            input = open(filename, 'r')
>>>            stuff=cPickle.load(input)
>>>            for line in stuff:
>>>                    #firstName=cPickle.load(input)
>>>                    #email=cPickle.load(input)
>>>                    #print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
>>> (email).rjust(20)
>>>                    stuff=cPickle.load(input)
>>>                    print stuff
>>>                    print line
>>>            input.close()
>>>    if command=='exit' or command=='quit' : #NEVER forget the exit!!!
>>>            print 'Save changes? y for Yes, n for No'
>>>            commandSave=sys.stdin.readline()[:-1]
>>>            if commandSave =='y': #if the user wants to save
>>>                    output=open(filename, 'w')
>>>                    cPickle.dump(work,output)
>>>                    output.close()
>>>                    sys.exit(0)
>>>            if commandSave =='n': #no save
>>>                    input.close()
>>>                    sys.exit(0)
>>>    if command=='add': #adds an entity to the file
>>>            print 'Last name?'
>>>            lastName=sys.stdin.readline()[:-1]
>>>            print 'First name?'
>>>            firstName=sys.stdin.readline()[:-1]
>>>            print 'Email address?'
>>>            email=sys.stdin.readline()[:-1]
>>>            work = format%(lastName, firstName, email)
>>>            #output=open(filename, 'w')
>>>            #data=cPickle.load(output)
>>>            #data.append(work)
>>>            #output.close()
>>>            output=open(filename, 'a')
>>>            cPickle.dump(work,output)
>>>            output.close()
>>> [/code]
>>> All help would be appreciated. I am new to Python and this seems to be
>>> quite a challenge for me.
>> Make sure you use modes "rb" and "wb" when you open the pickle files. If
>> you are running on Windows this can make a difference.
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> I've tried both rb and wb as well as r and w, there appears to be no
> difference in the running of the code.
> 
"cPickle.dump(work,output)" writes a string and 
"stuff=cPickle.load(input)" just reads that string, so "for line in 
stuff:" is iterating through the characters if the string. You need to 
use cPickle.load() to read each string (line).


From curt.hash at gmail.com  Fri Feb  6 15:09:41 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Fri, 6 Feb 2009 13:09:41 -0700
Subject: Fastest database solution
In-Reply-To: <498C2AEB.1010907@egenix.com>
References: <736698790902060010x4263cb2cp643bbc63398f56f5@mail.gmail.com>
	<498C2AEB.1010907@egenix.com>
Message-ID: <736698790902061209r207d7e03lc6fe1afd92bfef2a@mail.gmail.com>

On Fri, Feb 6, 2009 at 5:19 AM, M.-A. Lemburg <mal at egenix.com> wrote:
> On 2009-02-06 09:10, Curt Hash wrote:
>> I'm writing a small application for detecting source code plagiarism that
>> currently relies on a database to store lines of code.
>>
>> The application has two primary functions: adding a new file to the database
>> and comparing a file to those that are already stored in the database.
>>
>> I started out using sqlite3, but was not satisfied with the performance
>> results. I then tried using psycopg2 with a local postgresql server, and the
>> performance got even worse. My simple benchmarks show that sqlite3 is an
>> average of 3.5 times faster at inserting a file, and on average less than a
>> tenth of a second slower than psycopg2 at matching a file.
>>
>> I expected postgresql to be a lot faster ... is there some peculiarity in
>> psycopg2 that could be causing slowdown? Are these performance results
>> typical? Any suggestions on what to try from here? I don't think my
>> code/queries are inherently slow, but I'm not a DBA or a very accomplished
>> Python developer, so I could be wrong.
>>
>> Any advice is appreciated.
>
> In general, if you do bulk insert into a large table, you should consider
> turning off indexing on the table and recreate/update the indexes in one
> go afterwards.
>
> But regardless of this detail, I think you should consider a filesystem
> based approach. This is going to be a lot faster than using a
> database to store the source code line by line. You can still use
> a database for the administration and indexing of the data, e.g.
> by storing a hash of each line in the database.
>

I can see how reconstructing source code from individual lines in the
database would be much slower than a filesystem-based approach.
However, what is of particular importance is that the matching itself
be fast. While the original lines of code are stored in the database,
I am performing matching based on only hashes. Would storing the
original code in the same table as the hash cause significant slowdown
if I am querying by hash only?

I think I may try this approach anyways, just to make retrieving the
original source code after finding a match faster, but I am still
primarily concerned with the speed of the hash lookups.

> --
> Marc-Andre Lemburg
> eGenix.com
>
> Professional Python Services directly from the Source  (#1, Feb 06 2009)
>>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
> ________________________________________________________________________
>
> ::: Try our new mxODBC.Connect Python Database Interface for free ! ::::
>
>
>   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
>    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
>           Registered at Amtsgericht Duesseldorf: HRB 46611
>               http://www.egenix.com/company/contact/
>


From bthayre at physics.ucsd.edu  Fri Feb  6 15:31:08 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 12:31:08 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
Message-ID: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>

Hello again,
I've found myself stumped when trying to organize this list of
objects.  The objects in question are timesheets which i'd like to
sort by four attributes:

class TimeSheet:
  department = string
  engagement = string
  date = datetime.date
  stare_hour = datetime.time

My ultimate goal is to have a list of this timesheet objects which are
first sorted by departments, then within each department block of the
list, have it organized by projects.  Within each project block i
finally want them sorted chronologically by date and time.

To sort the strings i tried:

timesheets.sort(key=operator.attrgetter('string'))

which is not doing anything to my list unfortunately; it leaves it
untouched.

Giving up on that  i tried to sort the dates or times using:

def sorter_time(a,b):
  if a.engagement == engagement:   # I only want sorting done within
each engagement block
    return cmp(a.start, b.start)
  return 0

timesheets.sort(sorter_time)

But this also did nothing to my list, and at this point i'm incredibly
confused.  From what i know of the involved functions, i would think
that these lines of code (while they wouldn't do exactly what i want
yet) would at least do something to my lists.

Any explanations, or suggestions for a different approach would be
greatly appreciated.  My brain might explode if i continue.



From miki.tebeka at gmail.com  Fri Feb  6 15:56:25 2009
From: miki.tebeka at gmail.com (Miki)
Date: Fri, 6 Feb 2009 12:56:25 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <0898369a-495e-44f3-8771-c26daf48db39@40g2000prx.googlegroups.com>


> I've found myself stumped when trying to organize this list of
> objects. ?The objects in question are timesheets which i'd like to
> sort by four attributes:
>
> class TimeSheet:
> ? department = string
> ? engagement = string
> ? date = datetime.date
> ? stare_hour = datetime.time
>
> My ultimate goal is to have a list of this timesheet objects which are
> first sorted by departments, then within each department block of the
> list, have it organized by projects. ?Within each project block i
> finally want them sorted chronologically by date and time.

Python "natural" sort for tuples is doing the right thing for you, for
example:
from operator import attrgetter
from random import randint
class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return "(%s, %s)" % (self.x, self.y)


points = [Point(randint(1, 10), randint(1, 10)) for i in range(10)]
print points
points.sort(key=attrgetter("x", "y"))
print points

Gave me:
[(2, 3), (1, 4), (4, 4), (6, 6), (2, 10), (3, 5), (7, 1), (3, 6), (4,
1), (9, 6)]
[(1, 4), (2, 3), (2, 10), (3, 5), (3, 6), (4, 1), (4, 4), (6, 6), (7,
1), (9, 6)]

Points first sorted by 'x' and then by 'y'.

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com


From rdmurray at bitdance.com  Fri Feb  6 15:58:10 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Fri, 6 Feb 2009 20:58:10 +0000 (UTC)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <gmi892$dge$1@ger.gmane.org>

Quoth Robocop <bthayre at physics.ucsd.edu>:
> Hello again,
> I've found myself stumped when trying to organize this list of
> objects.  The objects in question are timesheets which i'd like to
> sort by four attributes:
> 
> class TimeSheet:
>   department = string
>   engagement = string
>   date = datetime.date
>   stare_hour = datetime.time
> 
> My ultimate goal is to have a list of this timesheet objects which are
> first sorted by departments, then within each department block of the
> list, have it organized by projects.  Within each project block i
> finally want them sorted chronologically by date and time.
> 
> To sort the strings i tried:
> 
> timesheets.sort(key=operator.attrgetter('string'))
> 
> which is not doing anything to my list unfortunately; it leaves it
> untouched.

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> class Timesheet(object):
    ...     def __init__(self, department): self.department=department
    ...     def __repr__(self): return "Timesheet(%s)" % self.department
    ... 
    >>> timesheets = [Timesheet('abc'), Timesheet('def'), Timesheet('acd')]
    >>> timesheets
    [Timesheet(abc), Timesheet(def), Timesheet(acd)]
    >>> import operator
    >>> timesheets.sort(key=operator.attrgetter('department'))
    >>> timesheets
    [Timesheet(abc), Timesheet(acd), Timesheet(def)]

The key bit here being the argument to attrgetter, which is the name
of the attribute to use as they key.

--RDM



From andrew.replogle at gmail.com  Fri Feb  6 15:58:40 2009
From: andrew.replogle at gmail.com (Andrew)
Date: Fri, 6 Feb 2009 12:58:40 -0800 (PST)
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
	<mailman.8946.1233890231.3487.python-list@python.org>
Message-ID: <8ac1c027-3bd4-43ae-99a9-012462cb06d7@r37g2000prr.googlegroups.com>

On Feb 5, 9:17?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Thu, 05 Feb 2009 17:34:29 -0200, Andrew <andrew.replo... at gmail.com> ?
> escribi?:
>
>
>
> > On Dec 16 2008, 5:11?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Tue, 16 Dec 2008 17:21:35 -0200, Andrew <andrew.replo... at gmail.com> ?
> >> escribi?:
>
> >> > On Dec 16, 12:50?pm, Christian Heimes <li... at cheimes.de> wrote:
> >> >> Andrew schrieb:
>
> >> >> > I'm running into a strange situation with getting incorrect
> >> >> > returncodes / exit status from python subprocess.call. I'm using a
> >> >> > python script (runtime 2.6.1 on windows) to automate the deploy of
> >> >> > java applications to glassfish application server. Below is an >> ?
> >> > example
> > I've tried this several ways now. It seems to be something specific
> > with python and asadmin.bat.
>
> > I've tried the following manually in the cmd.exe prompt:
>
> [examples showing %ERRORLEVEL% correctly set when running from the command ?
> line, but subprocess.call doesn't get it]
>
> > Notice how python never gets the correct returncode from asadmin.bat
> > but I can get the correct returncode from the shell every time. Can
> > anyone tell me why Python wouldn't be able to get the correct
> > returncode for asadmin?
>
> The last exit code set by a command *should* propagate as the exit code of ?
> the whole .bat, then as the exit code of the cmd.exe instance that runs ?
> it, and finally Python *should* receive that value. Some old Windows ?
> versions didn't behave like that, but AFAIK XP does the right thing here.
> Unless asadmin.bat is playing tricks with %ERRORLEVEL% or something.
> Can you post the contents of asadmin.bat?
>
> Without looking into it, I can think of a few alternatives:
>
> - rewrite asadmin.bat in Python, if feasible. Some scripts just check/set ?
> a few environment variables and execute some process at the end, and ?
> that's all; in this case it should be easy to emulate the same thing in ?
> Python.
>
> - try using another layer of your own, e.g., my_asadmin.bat:
>
> call asadmin.bat %*
> exit /b %ERRORLEVEL%
>
> - variation: write the exit code somewhere:
>
> call asadmin.bat %*
> echo %ERRORLEVEL% > asadmin.err
>
> and read asadmin.err from Python. (I've used something like this in a ?
> chain Win32 process --> 16 bits GUI application --> .bat script --> old ?
> DOS executable)
>
> --
> Gabriel Genellina

Thanks Gabriel,

Someone on the glassfish forums also pointed out the "exit /B
%ERRORLEVEL%" for the bottom of the batch file and that corrected the
issue for me. As well as not using that and removing "endlocal" which
I admit I have no clue what that does. Removing endlocal seems to
cause the batch script to pass out the correct returncode.

Thanks everyone for your input and assistance =]

Andrew


From bearophileHUGS at lycos.com  Fri Feb  6 16:03:32 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 13:03:32 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
Message-ID: <20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>

Robocop:

>then within each department block of the list, have it organized by projects.<

I don't know what does it means.

> timesheets.sort(key=operator.attrgetter('string'))

Try something like:
timesheets.sort(key=attrgetter("department", "engagement", "date",
"stare_hour"))


> My brain might explode if i continue.

Relax.

Bye,
bearophile


From cs at zip.com.au  Fri Feb  6 16:08:57 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 7 Feb 2009 08:08:57 +1100
Subject: Ordered dict by default
In-Reply-To: <47a82549-bc80-45ac-8b51-d58e597e768f@r24g2000vbp.googlegroups.com>
Message-ID: <20090206210857.GA6933@cskk.homeip.net>

On 05Feb2009 01:47, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
| [...] But even if the average performance becomes a
| little worse I think making the default Python dict as ordered is a
| positive change for Python too, because built-ins are meant to be as
| flexible as possible, even if they aren't the fastest ones or the less
| memory hungry ones

I like the builtins to be as fast as possible. If I'm not "abusing" a
built in facility I like to have the peace of mind that there's no
point being concerned about the performance of the built-in - it will be
optimal or close to it. So I feel no temptation to reimplement the wheel
and can devote my energies to the code using the wheel.

So if a dictionary has a performance weakness to add a non-widely-needed
behaviour, it's not longer a "pure" mapping and I will feel unhappy using
it.
 
| (and keeping dicts ordered decreases the surprises
| a newbie finds, makes some code cleaner, and doctests become simpler
| to write because the order of items may be more defined).

I read this as:
  - increases the unrealised assumptions about mappings in general which a
    newbie may acquire, causing them pain/complaint later with other
    mappings
  - makes some code shorter
  - making tests slightly simpler to write; it's not very hard to
    track insert order for purposes of a test short that be needed, is
    it? it seems a small gain for a loss in every production scenario

| Once the default dicts are ordered, it can be possible to add an
| unordereddict to the collections module to be used by programmers when
| max performance or low memory usage is very important :-)

I would much rather keep dictionaries as performant as possible, as a
bare mapping, and add an odict for when order matters.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

The wireless music box has no imaginable commercial value.   Who would pay
for a message sent to nobody in particular?
      --David Sarnoff's associates in response to his urgings for
        investment in  the radio in the 1920s.


From dq at gmail.com  Fri Feb  6 16:09:22 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 22:09:22 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <498beb5a$0$3305$9b622d9e@news.freenet.de>
References: <gmgp38$m2s$00$1@news.t-online.com>
	<498beb5a$0$3305$9b622d9e@news.freenet.de>
Message-ID: <gmi8u3$bms$01$1@news.t-online.com>

Martin v. L?wis wrote:
>> So does anyone know what the deal is with this?  Why is the same code so
>> much slower on Windows?  Hope someone can tell me before a holy war
>> erupts :-)
> 
> Only the holy war can give an answer here. It certainly has *nothing* to
> do with Python; Python calls the operating system functions to read from
> the network and write to the disk almost directly. So it must be the
> operating system itself that slows it down.
> 
> To investigate further, you might drop the write operating, and measure
> only source.read(). If that is slower, then, for some reason, the
> network speed is bad on Windows. Maybe you have the network interfaces
> misconfigured? Maybe you are using wireless on Windows, but cable on
> Linux? Maybe you have some network filtering software running on
> Windows? Maybe it's just that Windows sucks?-)
> 
> If the network read speed is fine, but writing slows down, I ask the
> same questions. Perhaps you have some virus scanner installed that
> filters all write operations? Maybe Windows sucks?
> 
> Regards,
> Martin
> 

Thanks for the ideas, Martin.  I ran a couple of experiments to find the 
culprit, by downloading the same 20 MB file from the same fast server. 
I compared:

1.  DL to HD vs USB iPod.
2.  AV on-access protection on vs. off
3.  "source. read()" only vs.  "file.write( source.read() )"

The culprit is definitely the write speed on the iPod.  That is, 
everything runs plenty fast (~1 MB/s down) as long as I'm not writing 
directly to the iPod.  This is kind of odd, because if I copy the file 
over from the HD to the iPod using windows (drag-n-drop), it takes about 
a second or two, so about 10 MB/s.

So the problem is definitely partially Windows, but it also seems that 
Python's file.write() function is not without blame.  It's the 
combination of Windows, iPod and Python's data stream that is slowing me 
down.

I'm not really sure what I can do about this.  I'll experiment a little 
more and see if there's any way around this bottleneck.  If anyone has 
run into a problem like this, I'd love to hear about it...

thanks again,
--danny


From sjmachin at lexicon.net  Fri Feb  6 16:14:43 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 13:14:43 -0800 (PST)
Subject: Question on Strings
References: <984064.27780.qm@web112219.mail.gq1.yahoo.com> 
	<mailman.8967.1233915857.3487.python-list@python.org>
	<0c01fc50-f20f-4981-af81-a49499acf776@q30g2000prq.googlegroups.com>
	<mailman.8995.1233944607.3487.python-list@python.org>
Message-ID: <786fac80-ebac-4264-ab45-6bf20c77b4c6@f40g2000pri.googlegroups.com>

On Feb 7, 5:23?am, Terry Reedy <tjre... at udel.edu> wrote:
> John Machin wrote:
> > The UTF-n siblings are *external* representations.
> > 2.x: a_unicode_object.decode('UTF-16') -> an_str_object
> > 3.x: an_str_object.decode('UTF-16') -> a_bytes_object
>
> That should be .encode() to bytes, which is the coded form.
> .decode is bytes => str/unicode

True. I guess that makes me the Dohmouse :-)


From rhamph at gmail.com  Fri Feb  6 16:23:48 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Fri, 6 Feb 2009 13:23:48 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
Message-ID: <9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>

On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > >Looks fine to me. In some situations you may also use hasattr(el,
> > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > >flatten generic iterables or only lists).
>
> > Of course, once you do that, you need to special-case strings...
>
> Strings are iterable but have no __iter__ method, which is fine in
> this context, since I would say 99.9% of times one wants to treat them
> as atomic objects, so no need to special case.

Don't worry, that little oddity was fixed for you:

Python 3.0+ (unknown, Dec  8 2008, 14:26:15)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> str.__iter__
<slot wrapper '__iter__' of 'str' objects>
>>> bytes.__iter__
<slot wrapper '__iter__' of 'bytes' objects>
>>> bytearray.__iter__
<slot wrapper '__iter__' of 'bytearray' objects>


I'm in the "why do you need more than 1 depth?" camp.  Dispatching
based on your own type should be given an extra look.  Dispatching
based passed in types should be given three extra looks.

I didn't realize itertools.chain(*iterable) worked.  I guess that
needs to be pushed as the canonical form.


From mmcclaf at gmail.com  Fri Feb  6 16:29:53 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 6 Feb 2009 13:29:53 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
	<mailman.9003.1233950946.3487.python-list@python.org>
Message-ID: <60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>

On Feb 6, 3:09?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> mmcclaf wrote:
> > On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
> >> mmcclaf wrote:
> >>> Hi there,
> >>> I have to make a small database using cPickle. I'm having troubles
> >>> trying to read in the information if it's more than one line. I'm
> >>> pretty sure it's in the line "for line in stuff:" Can anyone help me
> >>> out? Basically the end result is wanting it to look something like
> >>> what is down below when list is typed in:
> >>> Last name ? ? ? ? ? ? ? ? First Name ? ? ? ? ? ? ? ?Email Address
> >>> Doe ? ? ? ? ? ? ? ? ? ? ? ? ?John
> >>> j... at doe.com
> >>> [code]
> >>> # @author: Ocdt Murray McClafferty 24656
> >>> # This will manage a small database using the cPickle module.
> >>> # It must maintain a list of last names, first names and email
> >>> addresses, and must let a user interact with the program
> >>> #
> >>> #!usr/bin/python
> >>> # -*- coding: utf-8 -*-
> >>> import sys
> >>> import cPickle
> >>> #
> >>> format = '%s ? ? ? ? ? ? %s ? ? ? ? ? ? ? ? ?%s'
> >>> try:
> >>> ? ?filename = sys.argv[1]
> >>> ? ?input = open(filename, 'r')
> >>> except IOError:
> >>> ? ?print 'File is not available, will create a new file now'
> >>> ? ?lastName='Last Name'
> >>> ? ?firstName='First Name'
> >>> ? ?email= 'Email'
> >>> ? ?#input.close()
> >>> ? ?output=open (filename, 'w')
> >>> ? ?total = format%(lastName, firstName, email)
> >>> ? ?cPickle.dump(total,output)
> >>> ? ?#cPickle.dump(firstName,output)
> >>> ? ?#cPickle.dump(email,output)
> >>> ? ?output.close()
> >>> except EOFError:
> >>> ? ?print 'File is empty'
> >>> #datas = cPickle.load(input)
> >>> while True:
> >>> ? ?command=sys.stdin.readline()[:-1]
> >>> ? ?if command=='list': #lists the data in the file
> >>> ? ? ? ? ? ?input = open(filename, 'r')
> >>> ? ? ? ? ? ?stuff=cPickle.load(input)
> >>> ? ? ? ? ? ?for line in stuff:
> >>> ? ? ? ? ? ? ? ? ? ?#firstName=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?#email=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> >>> (email).rjust(20)
> >>> ? ? ? ? ? ? ? ? ? ?stuff=cPickle.load(input)
> >>> ? ? ? ? ? ? ? ? ? ?print stuff
> >>> ? ? ? ? ? ? ? ? ? ?print line
> >>> ? ? ? ? ? ?input.close()
> >>> ? ?if command=='exit' or command=='quit' : #NEVER forget the exit!!!
> >>> ? ? ? ? ? ?print 'Save changes? y for Yes, n for No'
> >>> ? ? ? ? ? ?commandSave=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?if commandSave =='y': #if the user wants to save
> >>> ? ? ? ? ? ? ? ? ? ?output=open(filename, 'w')
> >>> ? ? ? ? ? ? ? ? ? ?cPickle.dump(work,output)
> >>> ? ? ? ? ? ? ? ? ? ?output.close()
> >>> ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> >>> ? ? ? ? ? ?if commandSave =='n': #no save
> >>> ? ? ? ? ? ? ? ? ? ?input.close()
> >>> ? ? ? ? ? ? ? ? ? ?sys.exit(0)
> >>> ? ?if command=='add': #adds an entity to the file
> >>> ? ? ? ? ? ?print 'Last name?'
> >>> ? ? ? ? ? ?lastName=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?print 'First name?'
> >>> ? ? ? ? ? ?firstName=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?print 'Email address?'
> >>> ? ? ? ? ? ?email=sys.stdin.readline()[:-1]
> >>> ? ? ? ? ? ?work = format%(lastName, firstName, email)
> >>> ? ? ? ? ? ?#output=open(filename, 'w')
> >>> ? ? ? ? ? ?#data=cPickle.load(output)
> >>> ? ? ? ? ? ?#data.append(work)
> >>> ? ? ? ? ? ?#output.close()
> >>> ? ? ? ? ? ?output=open(filename, 'a')
> >>> ? ? ? ? ? ?cPickle.dump(work,output)
> >>> ? ? ? ? ? ?output.close()
> >>> [/code]
> >>> All help would be appreciated. I am new to Python and this seems to be
> >>> quite a challenge for me.
> >> Make sure you use modes "rb" and "wb" when you open the pickle files. If
> >> you are running on Windows this can make a difference.
>
> >> regards
> >> ?Steve
> >> --
> >> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> >> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/
>
> > I've tried both rb and wb as well as r and w, there appears to be no
> > difference in the running of the code.
>
> "cPickle.dump(work,output)" writes a string and
> "stuff=cPickle.load(input)" just reads that string, so "for line in
> stuff:" is iterating through the characters if the string. You need to
> use cPickle.load() to read each string (line).

Ok, so I just modified that section to:
[code]
	if command=='list': #lists the data in the file
		input = open(filename, 'r')
		stuff=cPickle.load(input)
		for line in stuff:
			#firstName=cPickle.load(input)
			#email=cPickle.load(input)
			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
(email).rjust(20)
			stuff=cPickle.load(input)
			print stuff


		input.close()
[/code]

And now it's printing it out ok, but then I get an EOFError at
stuff=cPickle.load(onput) at line 45.


From google at mrabarnett.plus.com  Fri Feb  6 16:47:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 21:47:41 +0000
Subject: Ordered dict by default
In-Reply-To: <20090206210857.GA6933@cskk.homeip.net>
References: <20090206210857.GA6933@cskk.homeip.net>
Message-ID: <498CAFFD.9010703@mrabarnett.plus.com>

Cameron Simpson wrote:
> On 05Feb2009 01:47, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
> | [...] But even if the average performance becomes a
> | little worse I think making the default Python dict as ordered is a
> | positive change for Python too, because built-ins are meant to be as
> | flexible as possible, even if they aren't the fastest ones or the less
> | memory hungry ones
[snip]
> I would much rather keep dictionaries as performant as possible, as a
> bare mapping, and add an odict for when order matters.
> 
+1



From skippy.hammond at gmail.com  Fri Feb  6 16:54:16 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 07 Feb 2009 08:54:16 +1100
Subject: Using multiprocessing from a Windows service
In-Reply-To: <498BC8E4.7000108@gmail.com>
References: <0e4d6033-a130-4c19-b648-6bcef8bfc922@u18g2000pro.googlegroups.com>	<498BB39D.5070809@gmail.com>
	<498BBBE0.6090704@gmail.com> <498BC8E4.7000108@gmail.com>
Message-ID: <498CB188.40104@gmail.com>

On 6/02/2009 4:21 PM, Volodymyr Orlenko wrote:
> In the patch I submitted, I simply check if the name of the supposed
> module ends with ".exe". It works fine for my case, but maybe this is
> too general. Is there a chance that a Python module would end in ".exe"?

IIRC, py2exe may create executables where sys.argv[0] is the executable 
itself.  Maybe if we consider and handle both these cases a patch to mp 
might be looked upon in a better light...

Cheers,

Mark


From google at mrabarnett.plus.com  Fri Feb  6 16:54:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 21:54:40 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmi8u3$bms$01$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>
	<gmi8u3$bms$01$1@news.t-online.com>
Message-ID: <498CB1A0.7090003@mrabarnett.plus.com>

dq wrote:
 > Martin v. L?wis wrote:
 >>> So does anyone know what the deal is with this?  Why is the same 
code so
 >>> much slower on Windows?  Hope someone can tell me before a holy war
 >>> erupts :-)
 >>
 >> Only the holy war can give an answer here. It certainly has *nothing* to
 >> do with Python; Python calls the operating system functions to read from
 >> the network and write to the disk almost directly. So it must be the
 >> operating system itself that slows it down.
 >>
 >> To investigate further, you might drop the write operating, and measure
 >> only source.read(). If that is slower, then, for some reason, the
 >> network speed is bad on Windows. Maybe you have the network interfaces
 >> misconfigured? Maybe you are using wireless on Windows, but cable on
 >> Linux? Maybe you have some network filtering software running on
 >> Windows? Maybe it's just that Windows sucks?-)
 >>
 >> If the network read speed is fine, but writing slows down, I ask the
 >> same questions. Perhaps you have some virus scanner installed that
 >> filters all write operations? Maybe Windows sucks?
 >>
 >> Regards,
 >> Martin
 >>
 >
 > Thanks for the ideas, Martin.  I ran a couple of experiments to find the
 > culprit, by downloading the same 20 MB file from the same fast server. I
 > compared:
 >
 > 1.  DL to HD vs USB iPod.
 > 2.  AV on-access protection on vs. off
 > 3.  "source. read()" only vs.  "file.write( source.read() )"
 >
 > The culprit is definitely the write speed on the iPod.  That is,
 > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
 > directly to the iPod.  This is kind of odd, because if I copy the file
 > over from the HD to the iPod using windows (drag-n-drop), it takes about
 > a second or two, so about 10 MB/s.
 >
 > So the problem is definitely partially Windows, but it also seems that
 > Python's file.write() function is not without blame.  It's the
 > combination of Windows, iPod and Python's data stream that is slowing me
 > down.
 >
 > I'm not really sure what I can do about this.  I'll experiment a little
 > more and see if there's any way around this bottleneck.  If anyone has
 > run into a problem like this, I'd love to hear about it...
 >
You could try copying the file to the iPod using the command line, or
copying data from disk to iPod in, say, C, anything but Python. This
would allow you to identify whether Python itself has anything to do
with it.


From skippy.hammond at gmail.com  Fri Feb  6 16:59:57 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Sat, 07 Feb 2009 08:59:57 +1100
Subject: WIn32api
In-Reply-To: <5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>
References: <5caea3690902060543s78b19efaxe95b63b4be89153d@mail.gmail.com>
	<5caea3690902060828k29e139f9g87065322610f1151@mail.gmail.com>
Message-ID: <498CB2DD.8010909@gmail.com>

On 7/02/2009 3:28 AM, K-Dawg wrote:

You might like to seek out the python-win32 mailing list for stuff like 
this where more people tend to pay attention to windows problems.

> This works if I call run() specifically. But when I try to initiate the
> thread with .start() I get the following error

Unfortunately threads and COM are tricky.  The short story is that you 
can't, in the general case, pass a COM object from one thread to 
another.  You need to google "COM threading models", and if you *really* 
want to pass objects between threads, the impressively named MSCOM 
function CoMarshalInterThreadInterfaceInStream (exposed via the 
pythoncom module).  The above mailing list has had a number of threads 
on this issue over the years...

Cheers,

Mark


From google at mrabarnett.plus.com  Fri Feb  6 17:04:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 22:04:09 +0000
Subject: Using cPickle
In-Reply-To: <60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>	<mailman.8986.1233933973.3487.python-list@python.org>	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>	<mailman.9003.1233950946.3487.python-list@python.org>
	<60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
Message-ID: <498CB3D9.6000203@mrabarnett.plus.com>

mmcclaf wrote:
> On Feb 6, 3:09 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> mmcclaf wrote:
>>> On Feb 6, 10:25 am, Steve Holden <st... at holdenweb.com> wrote:
>>>> mmcclaf wrote:
>>>>> Hi there,
>>>>> I have to make a small database using cPickle. I'm having troubles
>>>>> trying to read in the information if it's more than one line. I'm
>>>>> pretty sure it's in the line "for line in stuff:" Can anyone help me
>>>>> out? Basically the end result is wanting it to look something like
>>>>> what is down below when list is typed in:
>>>>> Last name                 First Name                Email Address
>>>>> Doe                          John
>>>>> j... at doe.com
>>>>> [code]
>>>>> # @author: Ocdt Murray McClafferty 24656
>>>>> # This will manage a small database using the cPickle module.
>>>>> # It must maintain a list of last names, first names and email
>>>>> addresses, and must let a user interact with the program
>>>>> #
>>>>> #!usr/bin/python
>>>>> # -*- coding: utf-8 -*-
>>>>> import sys
>>>>> import cPickle
>>>>> #
>>>>> format = '%s             %s                  %s'
>>>>> try:
>>>>>    filename = sys.argv[1]
>>>>>    input = open(filename, 'r')
>>>>> except IOError:
>>>>>    print 'File is not available, will create a new file now'
>>>>>    lastName='Last Name'
>>>>>    firstName='First Name'
>>>>>    email= 'Email'
>>>>>    #input.close()
>>>>>    output=open (filename, 'w')
>>>>>    total = format%(lastName, firstName, email)
>>>>>    cPickle.dump(total,output)
>>>>>    #cPickle.dump(firstName,output)
>>>>>    #cPickle.dump(email,output)
>>>>>    output.close()
>>>>> except EOFError:
>>>>>    print 'File is empty'
>>>>> #datas = cPickle.load(input)
>>>>> while True:
>>>>>    command=sys.stdin.readline()[:-1]
>>>>>    if command=='list': #lists the data in the file
>>>>>            input = open(filename, 'r')
>>>>>            stuff=cPickle.load(input)
>>>>>            for line in stuff:
>>>>>                    #firstName=cPickle.load(input)
>>>>>                    #email=cPickle.load(input)
>>>>>                    #print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
>>>>> (email).rjust(20)
>>>>>                    stuff=cPickle.load(input)
>>>>>                    print stuff
>>>>>                    print line
>>>>>            input.close()
>>>>>    if command=='exit' or command=='quit' : #NEVER forget the exit!!!
>>>>>            print 'Save changes? y for Yes, n for No'
>>>>>            commandSave=sys.stdin.readline()[:-1]
>>>>>            if commandSave =='y': #if the user wants to save
>>>>>                    output=open(filename, 'w')
>>>>>                    cPickle.dump(work,output)
>>>>>                    output.close()
>>>>>                    sys.exit(0)
>>>>>            if commandSave =='n': #no save
>>>>>                    input.close()
>>>>>                    sys.exit(0)
>>>>>    if command=='add': #adds an entity to the file
>>>>>            print 'Last name?'
>>>>>            lastName=sys.stdin.readline()[:-1]
>>>>>            print 'First name?'
>>>>>            firstName=sys.stdin.readline()[:-1]
>>>>>            print 'Email address?'
>>>>>            email=sys.stdin.readline()[:-1]
>>>>>            work = format%(lastName, firstName, email)
>>>>>            #output=open(filename, 'w')
>>>>>            #data=cPickle.load(output)
>>>>>            #data.append(work)
>>>>>            #output.close()
>>>>>            output=open(filename, 'a')
>>>>>            cPickle.dump(work,output)
>>>>>            output.close()
>>>>> [/code]
>>>>> All help would be appreciated. I am new to Python and this seems to be
>>>>> quite a challenge for me.
>>>> Make sure you use modes "rb" and "wb" when you open the pickle files. If
>>>> you are running on Windows this can make a difference.
>>>> regards
>>>>  Steve
>>>> --
>>>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>>>> Holden Web LLC              http://www.holdenweb.com/
>>> I've tried both rb and wb as well as r and w, there appears to be no
>>> difference in the running of the code.
>> "cPickle.dump(work,output)" writes a string and
>> "stuff=cPickle.load(input)" just reads that string, so "for line in
>> stuff:" is iterating through the characters if the string. You need to
>> use cPickle.load() to read each string (line).
> 
> Ok, so I just modified that section to:
> [code]
> 	if command=='list': #lists the data in the file
> 		input = open(filename, 'r')
> 		stuff=cPickle.load(input)
> 		for line in stuff:
You're still iterating over the string.

> 			#firstName=cPickle.load(input)
> 			#email=cPickle.load(input)
> 			#print repr (lastName).rjust(10), repr(firstName).rjust(20), repr
> (email).rjust(20)
> 			stuff=cPickle.load(input)
> 			print stuff
> 
> 
> 		input.close()
> [/code]
> 
> And now it's printing it out ok, but then I get an EOFError at
> stuff=cPickle.load(onput) at line 45.
> 
You can just keep reading until EOFError occurs, at which point you know
you've reached the end of the file:

input = open(filename, 'rb')
try:
     while True:
         stuff = cPickle.load(input)
         print stuff
except EOFError:
     pass
input.close()


From bthayre at physics.ucsd.edu  Fri Feb  6 17:08:30 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:08:30 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
Message-ID: <ee399ac9-cc32-4838-832a-9dd682dbbd71@v39g2000pro.googlegroups.com>

On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
> Robocop:
>
> >then within each department block of the list, have it organized by projects.<
>
> I don't know what does it means.
>
> > timesheets.sort(key=operator.attrgetter('string'))
>
> Try something like:
> timesheets.sort(key=attrgetter("department", "engagement", "date",
> "stare_hour"))
>
> > My brain might explode if i continue.
>
> Relax.
>
> Bye,
> bearophile

Projects was meant to be engagements.  All these suggestions are
great, let me see what i can make happen right now. Thanks all!


From bthayre at physics.ucsd.edu  Fri Feb  6 17:17:10 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:17:10 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
Message-ID: <d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>

On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
> Robocop:
>
> >then within each department block of the list, have it organized by projects.<
>
> I don't know what does it means.
>
> > timesheets.sort(key=operator.attrgetter('string'))
>
> Try something like:
> timesheets.sort(key=attrgetter("department", "engagement", "date",
> "stare_hour"))
>
> > My brain might explode if i continue.
>
> Relax.
>
> Bye,
> bearophile




UH OH GUYS!

line 110, in sorter
    timesheets.sort(key=attrgetter("department", "engagement",
"date","start"))
TypeError: attrgetter expected 1 arguments, got 4


From bthayre at physics.ucsd.edu  Fri Feb  6 17:20:09 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:20:09 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
Message-ID: <3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>

On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
>
>
> > Robocop:
>
> > >then within each department block of the list, have it organized by projects.<
>
> > I don't know what does it means.
>
> > > timesheets.sort(key=operator.attrgetter('string'))
>
> > Try something like:
> > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > "stare_hour"))
>
> > > My brain might explode if i continue.
>
> > Relax.
>
> > Bye,
> > bearophile
>
> UH OH GUYS!
>
> line 110, in sorter
> ? ? timesheets.sort(key=attrgetter("department", "engagement",
> "date","start"))
> TypeError: attrgetter expected 1 arguments, got 4

I think there may have been a misunderstanding.  I was already using
attrgetter, my problem is that it doesn't appear to be sorting by the
argument i give it.  How does sort work with strings?  How about with
datetime.time or datetime.date?

So far i can get it sorting strictly by the datetime objects, but i
need all of this sorting done within the constraints imposed by doing
sorts via department and engagements.

Any ideas?


From bthayre at physics.ucsd.edu  Fri Feb  6 17:34:35 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:34:35 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
Message-ID: <9c1c8e31-98fc-4fbf-827c-d785685b91e5@v5g2000pre.googlegroups.com>

On Feb 6, 2:20?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
>
>
> > On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
> > > Robocop:
>
> > > >then within each department block of the list, have it organized by projects.<
>
> > > I don't know what does it means.
>
> > > > timesheets.sort(key=operator.attrgetter('string'))
>
> > > Try something like:
> > > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > > "stare_hour"))
>
> > > > My brain might explode if i continue.
>
> > > Relax.
>
> > > Bye,
> > > bearophile
>
> > UH OH GUYS!
>
> > line 110, in sorter
> > ? ? timesheets.sort(key=attrgetter("department", "engagement",
> > "date","start"))
> > TypeError: attrgetter expected 1 arguments, got 4
>
> I think there may have been a misunderstanding. ?I was already using
> attrgetter, my problem is that it doesn't appear to be sorting by the
> argument i give it. ?How does sort work with strings? ?How about with
> datetime.time or datetime.date?
>
> So far i can get it sorting strictly by the datetime objects, but i
> need all of this sorting done within the constraints imposed by doing
> sorts via department and engagements.
>
> Any ideas?

I'm stuck with python 2.4 right now:(


From tjreedy at udel.edu  Fri Feb  6 17:34:51 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 06 Feb 2009 17:34:51 -0500
Subject: Trouble sorting a list of objects by attributes
In-Reply-To: <d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
Message-ID: <gmiduc$vej$1@ger.gmane.org>

Robocop wrote:

> UH OH GUYS!
> 
> line 110, in sorter
>     timesheets.sort(key=attrgetter("department", "engagement",
> "date","start"))
> TypeError: attrgetter expected 1 arguments, got 4

Um... what version of Python are you running?  Alway specify. (Too many 
people do not).  In 3.0

from operator import attrgetter
f=attrgetter("department", "engagement","date","start")

runs fine as per the doc.

operator.attrgetter(attr[, args...])
Return a callable object that fetches attr from its operand. If more 
than one attribute is requested, returns a tuple of attributes. After, f 
= attrgetter('name'), the call f(b) returns b.name. After, f = 
attrgetter('name', 'date'), the call f(b) returns (b.name, b.date).



From dq at gmail.com  Fri Feb  6 17:35:58 2009
From: dq at gmail.com (dq)
Date: Fri, 06 Feb 2009 23:35:58 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9008.1233957283.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>
	<mailman.9008.1233957283.3487.python-list@python.org>
Message-ID: <gmie0f$3e7$03$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>  > Martin v. L?wis wrote:
>  >>> So does anyone know what the deal is with this?  Why is the same 
> code so
>  >>> much slower on Windows?  Hope someone can tell me before a holy war
>  >>> erupts :-)
>  >>
>  >> Only the holy war can give an answer here. It certainly has 
> *nothing* to
>  >> do with Python; Python calls the operating system functions to read 
> from
>  >> the network and write to the disk almost directly. So it must be the
>  >> operating system itself that slows it down.
>  >>
>  >> To investigate further, you might drop the write operating, and measure
>  >> only source.read(). If that is slower, then, for some reason, the
>  >> network speed is bad on Windows. Maybe you have the network interfaces
>  >> misconfigured? Maybe you are using wireless on Windows, but cable on
>  >> Linux? Maybe you have some network filtering software running on
>  >> Windows? Maybe it's just that Windows sucks?-)
>  >>
>  >> If the network read speed is fine, but writing slows down, I ask the
>  >> same questions. Perhaps you have some virus scanner installed that
>  >> filters all write operations? Maybe Windows sucks?
>  >>
>  >> Regards,
>  >> Martin
>  >>
>  >
>  > Thanks for the ideas, Martin.  I ran a couple of experiments to find the
>  > culprit, by downloading the same 20 MB file from the same fast server. I
>  > compared:
>  >
>  > 1.  DL to HD vs USB iPod.
>  > 2.  AV on-access protection on vs. off
>  > 3.  "source. read()" only vs.  "file.write( source.read() )"
>  >
>  > The culprit is definitely the write speed on the iPod.  That is,
>  > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
>  > directly to the iPod.  This is kind of odd, because if I copy the file
>  > over from the HD to the iPod using windows (drag-n-drop), it takes about
>  > a second or two, so about 10 MB/s.
>  >
>  > So the problem is definitely partially Windows, but it also seems that
>  > Python's file.write() function is not without blame.  It's the
>  > combination of Windows, iPod and Python's data stream that is slowing me
>  > down.
>  >
>  > I'm not really sure what I can do about this.  I'll experiment a little
>  > more and see if there's any way around this bottleneck.  If anyone has
>  > run into a problem like this, I'd love to hear about it...
>  >
> You could try copying the file to the iPod using the command line, or
> copying data from disk to iPod in, say, C, anything but Python. This
> would allow you to identify whether Python itself has anything to do
> with it.

Well, I think I've partially identified the problem.  target.write( 
source.read() ) runs perfectly fast, copies 20 megs in about a second, 
from HD to iPod.  However, if I run the same code in a while loop, using 
a certain block size, say target.write( source.read(4096) ), it takes 
forever (or at least I'm still timing it while I write this post).

The mismatch seems to be between urllib2's block size and the write 
speed of the iPod, I might try to tweak this a little in the code and 
see if it has any effect.

Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to 
try to improve that...


From bthayre at physics.ucsd.edu  Fri Feb  6 17:38:37 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 14:38:37 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com> 
	<9c1c8e31-98fc-4fbf-827c-d785685b91e5@v5g2000pre.googlegroups.com>
Message-ID: <635e13a8-cdc8-4535-bdd8-4df2fe719215@n33g2000pri.googlegroups.com>

On Feb 6, 2:34?pm, Robocop <btha... at physics.ucsd.edu> wrote:
> On Feb 6, 2:20?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
>
>
> > On Feb 6, 2:17?pm, Robocop <btha... at physics.ucsd.edu> wrote:
>
> > > On Feb 6, 1:03?pm, bearophileH... at lycos.com wrote:
>
> > > > Robocop:
>
> > > > >then within each department block of the list, have it organized by projects.<
>
> > > > I don't know what does it means.
>
> > > > > timesheets.sort(key=operator.attrgetter('string'))
>
> > > > Try something like:
> > > > timesheets.sort(key=attrgetter("department", "engagement", "date",
> > > > "stare_hour"))
>
> > > > > My brain might explode if i continue.
>
> > > > Relax.
>
> > > > Bye,
> > > > bearophile
>
> > > UH OH GUYS!
>
> > > line 110, in sorter
> > > ? ? timesheets.sort(key=attrgetter("department", "engagement",
> > > "date","start"))
> > > TypeError: attrgetter expected 1 arguments, got 4
>
> > I think there may have been a misunderstanding. ?I was already using
> > attrgetter, my problem is that it doesn't appear to be sorting by the
> > argument i give it. ?How does sort work with strings? ?How about with
> > datetime.time or datetime.date?
>
> > So far i can get it sorting strictly by the datetime objects, but i
> > need all of this sorting done within the constraints imposed by doing
> > sorts via department and engagements.
>
> > Any ideas?
>
> I'm stuck with python 2.4 right now:(

I've got a python 2.4 fix though!

 timesheets.sort(key= lambda i:(i.department,i.engagement,i.start))



Thanks for the help and time!!!!!


From apt.shansen at gmail.com  Fri Feb  6 17:41:25 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 14:41:25 -0800
Subject: Trouble sorting a list of objects by attributes
In-Reply-To: <3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com>
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com>
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com>
Message-ID: <7a9c25c20902061441u56a646e2lc1767fc03360f55c@mail.gmail.com>

> I think there may have been a misunderstanding.  I was already using
> attrgetter, my problem is that it doesn't appear to be sorting by the
> argument i give it.  How does sort work with strings?  How about with
> datetime.time or datetime.date?

You were using the attrgetter, but it looks like you weren't doing it correctly:

    timesheets.sort(key=operator.attrgetter('string'))

You don't specify a type, be it string or date or anything: you
specify the /name/ of the attribute to get. It'll handle sorting by
any data type that has an order to it without you having to worry
about it at all. Strings, ints, dates, times.

It should be:

   timesheets.sort(key=operator.attrgetter("department"))

If you want to sort by the value of the "department" attribute, which
happens to be a string.
If you want to sort by the "date" attribute, which happens to be a
datetime.date, you do:
   timesheets.sort(key=operator.attrgetter("date"))

Where date is not a datatype a la datetime.date, but the name of an
attribute on your TimeSheet instances.

--S


From bearophileHUGS at lycos.com  Fri Feb  6 18:19:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 15:19:22 -0800 (PST)
Subject: Ordered dict by default
References: <mailman.9006.1233954552.3487.python-list@python.org>
Message-ID: <dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>

Cameron Simpson:

>increases the unrealised assumptions about mappings in general which a newbie may acquire, causing them pain/complaint later with other mappings<

This is wrong in several different ways.


> I would much rather keep dictionaries as performant as possible, as a
> bare mapping, and add an odict for when order matters.

In Python 3 strings are all unicode, integral numbers are all
multiprecision, chars in Python 2.x+ are strings, lists are arrays
that can grow dynamically, and so on because the Purpose of Python
isn't to be as fast as possible, but to be first of all flexible,
safe, easy, not but-prone, even if other solution or older versions
were faster. Ruby shares almost same purposes.

I presume Ruby wants to become a bit higher level than Python, because
it now has a more flexible built-in. But even in a language designed
to run way faster than Python, like D, I think the right thing for
built-ins is to be as flexible&easy as possible, so they are good
enough in as many situations as possible, where performance isn't the
most important thing, and to put the more specialized and faster
versions into external libs. Making the built-ins be as optimized as
possible (but limited too) looks like premature optimization to me,
and in a language like Python premature optimization looks even more
silly than usual.

Bye,
bearophile


From patrick.hartling at gmail.com  Fri Feb  6 18:19:52 2009
From: patrick.hartling at gmail.com (Patrick Hartling)
Date: Fri, 6 Feb 2009 17:19:52 -0600
Subject: Module unloading resulting from SystemExit exception
Message-ID: <944f7d8e0902061519x5dbc531au87003997a7a9bd10@mail.gmail.com>

I am trying to understand how the SystemExit exception influences
module unloading. The situation that I am facing is that a Python
application behaves just fine upon exiting when executed using the
standard Python interpreter, but when run as a frozen executable,
modules are unloaded unexpectedly as a result of sys.exit() being
called. This wouldn't be an issue at all except that callbacks
registered with the atexit module have to re-import all modules that
they want to use, and this can be rather unwieldy.

I have narrowed it down to the SystemExit exception by determining
that the problem does not occur if my __main__ module catches
SystemExit and allows the script to terminate by reaching the end of
__main__. If the exception is not caught or is re-raised, then the
problem occurs. Since SystemExit influences the shutdown of threads,
it seems that I need to let it be raised to keep the application from
deadlocking on exit.

I am working with Python 2.6.1, and I saw this behavior with 2.5 as
well. It happens on Windows, Mac OS X, and Linux. The code that I am
using for the frozen executable is generated by sib.py from VendorID
1.0.0. The fact that VendorID is being used is inconsequential. I have
verified that its use in the executable is not causing this behavior
by removing all references to it. I have reduced this to the minimum
amount of code required to reproduce the problem and attached the
Python script an the C code generated by sib.py for the application
main() function.

My guess is that the code that sib.py generates is failing to do
something that Py_Main() would normally do. To that end, I have tried
modifying the main() function in a variety of ways to get it as close
to Py_Main() as I can, but it still exhibits the undesirable behavior
when sys.exit() is called. That pretty much leaves me thinking that
PyImport_ExecCodeModule() or PyImport_ImportFrozenModule() (I have
also looked at Py_FrozenMain() for insight) is the culprit.

Can anyone point me in the right direction for understanding how the
SystemExit exception results in this behavior? My hope is that there
is a change (simple or not) that can be made to the C code for the
frozen executable to resolve the problem.

Thanks in advance.

 -Patrick


-- 
Patrick L. Hartling
http://www.137.org/patrick/
-------------- next part --------------
/*==========================================================================*/
/* Main startup code for test                                               */
/* This is generated code; Do not modify it!                                */
/*--------------------------------------------------------------------------*/
#include <stdarg.h>
#include <Python.h>
#include <marshal.h>
/* #include <vendorid.h> */

extern unsigned char M___main__[];

static struct _frozen _PyImport_FrozenModules[] =
{
    {0, 0, 0} /* sentinel */
};

int main(int argc, char **argv)
{
    PyObject *v, *co;
    PyImport_FrozenModules = _PyImport_FrozenModules;

    Py_SetProgramName((char *)"test");
/*    vendorid_init(); */
    Py_Initialize();
    PySys_SetArgv(argc, argv);
    co = PyMarshal_ReadObjectFromString((char *)M___main__, 655);
    v = PyImport_ExecCodeModule((char *)"__main__", co);
    if(v == NULL)
    {
        PyErr_Print();
        return -1;
    }
    Py_DECREF(v);
    Py_Finalize();
    return 0;
}

/*==========================================================================*/
/* EOF                                                                      */
/*--------------------------------------------------------------------------*/
-------------- next part --------------
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From bearophileHUGS at lycos.com  Fri Feb  6 18:26:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 6 Feb 2009 15:26:57 -0800 (PST)
Subject: Ordered dict by default
References: <mailman.9006.1233954552.3487.python-list@python.org> 
	<dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
Message-ID: <6f38e8bc-4ecd-4b9f-abef-b885cd16b375@p37g2000yqd.googlegroups.com>

bearophile:
> In Python 3 strings are all unicode, integral numbers are all
> multiprecision, chars in Python 2.x+ are strings, lists are arrays
> that can grow dynamically, and so on because the Purpose of Python
> isn't to be as fast as possible, but to be first of all flexible,
> safe, easy, not but-prone, even if other solution or older versions
> were faster.

I have missed another example: It may be possible to create a sorting
routine that's not stable but is faster than the current stable
timsort (for example in C++ STL you have both sorting routines, and
the unstable one is a variant of introsort that is faster than the
stable version). I think Python will keep the stable one, because even
if (in theory. In practice it may be quite difficult to write such
unstable sorter faster than timsort) it can be slower, it's safer and
more useful than an unstable sort.

Bye,
bearophile


From google at mrabarnett.plus.com  Fri Feb  6 18:30:38 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 23:30:38 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmie0f$3e7$03$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>
	<gmie0f$3e7$03$1@news.t-online.com>
Message-ID: <498CC81E.8050607@mrabarnett.plus.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>> Martin v. L?wis wrote:
>>>>> So does anyone know what the deal is with this?  Why is the
>>>>> same code so much slower on Windows?  Hope someone can tell
>>>>> me before a holy war erupts :-)
>>>> 
>>>> Only the holy war can give an answer here. It certainly has 
>>>> *nothing* to do with Python; Python calls the operating system
>>>> functions to read from the network and write to the disk almost
>>>> directly. So it must be the operating system itself that slows
>>>> it down.
>>>> 
>>>> To investigate further, you might drop the write operating, and
>>>> measure only source.read(). If that is slower, then, for some
>>>> reason, the network speed is bad on Windows. Maybe you have the
>>>> network interfaces misconfigured? Maybe you are using wireless
>>>> on Windows, but cable on Linux? Maybe you have some network
>>>> filtering software running on Windows? Maybe it's just that
>>>> Windows sucks?-)
>>>> 
>>>> If the network read speed is fine, but writing slows down, I
>>>> ask the same questions. Perhaps you have some virus scanner
>>>> installed that filters all write operations? Maybe Windows
>>>> sucks?
>>>> 
>>> Thanks for the ideas, Martin.  I ran a couple of experiments to 
>>> find the culprit, by downloading the same 20 MB file from the
>>> same fast server. I compared:
>>> 
>>> 1.  DL to HD vs USB iPod.
>>> 2.  AV on-access protection on vs. off
>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
>>> 
>>> The culprit is definitely the write speed on the iPod.  That is, 
>>> everything runs plenty fast (~1 MB/s down) as long as I'm not
>>> writing directly to the iPod.  This is kind of odd, because if I
>>> copy the file over from the HD to the iPod using windows
>>> (drag-n-drop), it takes about a second or two, so about 10 MB/s.
>>> 
>>> So the problem is definitely partially Windows, but it also seems
>>> that Python's file.write() function is not without blame.  It's
>>> the combination of Windows, iPod and Python's data stream that is
>>> slowing me down.
>>> 
>>> I'm not really sure what I can do about this.  I'll experiment a
>>> little more and see if there's any way around this bottleneck.
>>> If anyone has run into a problem like this, I'd love to hear
>>> about it...
>>> 
>> You could try copying the file to the iPod using the command line,
>> or copying data from disk to iPod in, say, C, anything but Python.
>> This would allow you to identify whether Python itself has anything
>> to do with it.
> 
> Well, I think I've partially identified the problem.  target.write( 
> source.read() ) runs perfectly fast, copies 20 megs in about a
> second, from HD to iPod.  However, if I run the same code in a while
> loop, using a certain block size, say target.write( source.read(4096)
> ), it takes forever (or at least I'm still timing it while I write
> this post).
> 
> The mismatch seems to be between urllib2's block size and the write 
> speed of the iPod, I might try to tweak this a little in the code and
> see if it has any effect.
> 
> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to
> try to improve that...
> 
How long does it take to transfer 4KB? If it can transfer 1MB/s then I'd
say that 4KB is too small. Generally speaking, the higher the data rate,
the larger the blocks you should be transferring at a time, IMHO.

You could write a script to test the transfer speed with different block
sizes.


From google at mrabarnett.plus.com  Fri Feb  6 18:34:49 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 06 Feb 2009 23:34:49 +0000
Subject: Ordered dict by default
In-Reply-To: <dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
References: <mailman.9006.1233954552.3487.python-list@python.org>
	<dd998059-38ad-49ee-a4f3-75db40194176@t11g2000yqg.googlegroups.com>
Message-ID: <498CC919.8000208@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> Cameron Simpson:
> 
>> increases the unrealised assumptions about mappings in general
>> which a newbie may acquire, causing them pain/complaint later with
>> other mappings<
> 
> This is wrong in several different ways.
> 
>> I would much rather keep dictionaries as performant as possible, as
>> a bare mapping, and add an odict for when order matters.
> 
> In Python 3 strings are all unicode, integral numbers are all 
> multiprecision, chars in Python 2.x+ are strings, lists are arrays 
> that can grow dynamically, and so on because the Purpose of Python 
> isn't to be as fast as possible, but to be first of all flexible, 
> safe, easy, not but-prone, even if other solution or older versions 
> were faster. Ruby shares almost same purposes.
> 
> I presume Ruby wants to become a bit higher level than Python,
> because it now has a more flexible built-in. But even in a language
> designed to run way faster than Python, like D, I think the right
> thing for built-ins is to be as flexible&easy as possible, so they
> are good enough in as many situations as possible, where performance
> isn't the most important thing, and to put the more specialized and
> faster versions into external libs. Making the built-ins be as
> optimized as possible (but limited too) looks like premature
> optimization to me, and in a language like Python premature
> optimization looks even more silly than usual.
> 
You'll be wanting ordered sets next! :-)


From dq at gmail.com  Fri Feb  6 18:36:02 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 00:36:02 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmie0f$3e7$03$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>
	<mailman.9008.1233957283.3487.python-list@python.org>
	<gmie0f$3e7$03$1@news.t-online.com>
Message-ID: <gmihh4$o2b$02$1@news.t-online.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>  > Martin v. L?wis wrote:
>>  >>> So does anyone know what the deal is with this?  Why is the same 
>> code so
>>  >>> much slower on Windows?  Hope someone can tell me before a holy war
>>  >>> erupts :-)
>>  >>
>>  >> Only the holy war can give an answer here. It certainly has 
>> *nothing* to
>>  >> do with Python; Python calls the operating system functions to 
>> read from
>>  >> the network and write to the disk almost directly. So it must be the
>>  >> operating system itself that slows it down.
>>  >>
>>  >> To investigate further, you might drop the write operating, and 
>> measure
>>  >> only source.read(). If that is slower, then, for some reason, the
>>  >> network speed is bad on Windows. Maybe you have the network 
>> interfaces
>>  >> misconfigured? Maybe you are using wireless on Windows, but cable on
>>  >> Linux? Maybe you have some network filtering software running on
>>  >> Windows? Maybe it's just that Windows sucks?-)
>>  >>
>>  >> If the network read speed is fine, but writing slows down, I ask the
>>  >> same questions. Perhaps you have some virus scanner installed that
>>  >> filters all write operations? Maybe Windows sucks?
>>  >>
>>  >> Regards,
>>  >> Martin
>>  >>
>>  >
>>  > Thanks for the ideas, Martin.  I ran a couple of experiments to 
>> find the
>>  > culprit, by downloading the same 20 MB file from the same fast 
>> server. I
>>  > compared:
>>  >
>>  > 1.  DL to HD vs USB iPod.
>>  > 2.  AV on-access protection on vs. off
>>  > 3.  "source. read()" only vs.  "file.write( source.read() )"
>>  >
>>  > The culprit is definitely the write speed on the iPod.  That is,
>>  > everything runs plenty fast (~1 MB/s down) as long as I'm not writing
>>  > directly to the iPod.  This is kind of odd, because if I copy the file
>>  > over from the HD to the iPod using windows (drag-n-drop), it takes 
>> about
>>  > a second or two, so about 10 MB/s.
>>  >
>>  > So the problem is definitely partially Windows, but it also seems that
>>  > Python's file.write() function is not without blame.  It's the
>>  > combination of Windows, iPod and Python's data stream that is 
>> slowing me
>>  > down.
>>  >
>>  > I'm not really sure what I can do about this.  I'll experiment a 
>> little
>>  > more and see if there's any way around this bottleneck.  If anyone has
>>  > run into a problem like this, I'd love to hear about it...
>>  >
>> You could try copying the file to the iPod using the command line, or
>> copying data from disk to iPod in, say, C, anything but Python. This
>> would allow you to identify whether Python itself has anything to do
>> with it.
> 
> Well, I think I've partially identified the problem.  target.write( 
> source.read() ) runs perfectly fast, copies 20 megs in about a second, 
> from HD to iPod.  However, if I run the same code in a while loop, using 
> a certain block size, say target.write( source.read(4096) ), it takes 
> forever (or at least I'm still timing it while I write this post).
> 
> The mismatch seems to be between urllib2's block size and the write 
> speed of the iPod, I might try to tweak this a little in the code and 
> see if it has any effect.
> 
> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to 
> try to improve that...

After some tweaking of the block size, I managed to get the DL speed up 
to about 900 Mb/s.  It's still not quite Ubuntu, but it's a good order 
of magnitude better.  The new DL code is pretty much this:

"""
blocksize = 2 ** 16    # plus or minus a power of 2
source = urllib2.urlopen( 'url://string' )
target = open( pathname, 'wb')
fullsize = float( source.info()['Content-Length'] )
DLd = 0
while DLd < fullsize:
	DLd = DLd + blocksize
	# optional:  write some DL progress info
	# somewhere, e.g. stdout
target.close()
source.close()
"""


	
	





From dq at gmail.com  Fri Feb  6 18:40:00 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 00:40:00 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9015.1233963041.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>
	<mailman.9015.1233963041.3487.python-list@python.org>
Message-ID: <gmihoi$o2b$02$2@news.t-online.com>

MRAB wrote:
> dq wrote:
>> MRAB wrote:
>>> dq wrote:
>>>> Martin v. L?wis wrote:
>>>>>> So does anyone know what the deal is with this?  Why is the
>>>>>> same code so much slower on Windows?  Hope someone can tell
>>>>>> me before a holy war erupts :-)
>>>>>
>>>>> Only the holy war can give an answer here. It certainly has 
>>>>> *nothing* to do with Python; Python calls the operating system
>>>>> functions to read from the network and write to the disk almost
>>>>> directly. So it must be the operating system itself that slows
>>>>> it down.
>>>>>
>>>>> To investigate further, you might drop the write operating, and
>>>>> measure only source.read(). If that is slower, then, for some
>>>>> reason, the network speed is bad on Windows. Maybe you have the
>>>>> network interfaces misconfigured? Maybe you are using wireless
>>>>> on Windows, but cable on Linux? Maybe you have some network
>>>>> filtering software running on Windows? Maybe it's just that
>>>>> Windows sucks?-)
>>>>>
>>>>> If the network read speed is fine, but writing slows down, I
>>>>> ask the same questions. Perhaps you have some virus scanner
>>>>> installed that filters all write operations? Maybe Windows
>>>>> sucks?
>>>>>
>>>> Thanks for the ideas, Martin.  I ran a couple of experiments to find 
>>>> the culprit, by downloading the same 20 MB file from the
>>>> same fast server. I compared:
>>>>
>>>> 1.  DL to HD vs USB iPod.
>>>> 2.  AV on-access protection on vs. off
>>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
>>>>
>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>> everything runs plenty fast (~1 MB/s down) as long as I'm not
>>>> writing directly to the iPod.  This is kind of odd, because if I
>>>> copy the file over from the HD to the iPod using windows
>>>> (drag-n-drop), it takes about a second or two, so about 10 MB/s.
>>>>
>>>> So the problem is definitely partially Windows, but it also seems
>>>> that Python's file.write() function is not without blame.  It's
>>>> the combination of Windows, iPod and Python's data stream that is
>>>> slowing me down.
>>>>
>>>> I'm not really sure what I can do about this.  I'll experiment a
>>>> little more and see if there's any way around this bottleneck.
>>>> If anyone has run into a problem like this, I'd love to hear
>>>> about it...
>>>>
>>> You could try copying the file to the iPod using the command line,
>>> or copying data from disk to iPod in, say, C, anything but Python.
>>> This would allow you to identify whether Python itself has anything
>>> to do with it.
>>
>> Well, I think I've partially identified the problem.  target.write( 
>> source.read() ) runs perfectly fast, copies 20 megs in about a
>> second, from HD to iPod.  However, if I run the same code in a while
>> loop, using a certain block size, say target.write( source.read(4096)
>> ), it takes forever (or at least I'm still timing it while I write
>> this post).
>>
>> The mismatch seems to be between urllib2's block size and the write 
>> speed of the iPod, I might try to tweak this a little in the code and
>> see if it has any effect.
>>
>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want to
>> try to improve that...
>>
> How long does it take to transfer 4KB? If it can transfer 1MB/s then I'd
> say that 4KB is too small. Generally speaking, the higher the data rate,
> the larger the blocks you should be transferring at a time, IMHO.
> 
> You could write a script to test the transfer speed with different block
> sizes.

Thanks MRAB, 32 or 64 KB seems to be quickest, but I'll do a more 
scientific test soon and see what turns up.


From mensanator at aol.com  Fri Feb  6 18:55:14 2009
From: mensanator at aol.com (Mensanator)
Date: Fri, 6 Feb 2009 15:55:14 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
Message-ID: <9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>

On Feb 6, 3:23?pm, Rhamphoryncus <rha... at gmail.com> wrote:
> On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > >flatten generic iterables or only lists).
>
> > > Of course, once you do that, you need to special-case strings...
>
> > Strings are iterable but have no __iter__ method, which is fine in
> > this context, since I would say 99.9% of times one wants to treat them
> > as atomic objects, so no need to special case.
>
> Don't worry, that little oddity was fixed for you:
>
> Python 3.0+ (unknown, Dec ?8 2008, 14:26:15)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> str.__iter__
>
> <slot wrapper '__iter__' of 'str' objects>>>> bytes.__iter__
>
> <slot wrapper '__iter__' of 'bytes' objects>>>> bytearray.__iter__
>
> <slot wrapper '__iter__' of 'bytearray' objects>
>
> I'm in the "why do you need more than 1 depth?" camp. ?Dispatching
> based on your own type should be given an extra look. ?Dispatching
> based passed in types should be given three extra looks.
>
> I didn't realize itertools.chain(*iterable) worked. ?I guess that
> needs to be pushed as the canonical form.

What about this (from the Recipes section of the itertools manual)?

def flatten(listOfLists):
    return list(chain.from_iterable(listOfLists))


From ihatespam at hotmail.com  Fri Feb  6 19:23:32 2009
From: ihatespam at hotmail.com (Just Another Victim of the Ambient Morality)
Date: Fri, 6 Feb 2009 19:23:32 -0500
Subject: Why doesn't this RE match?
Message-ID: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>

    I'm confused by this behaviour:


import re

regex = re.compile('foo')
match = regex.match('whatfooever')


    In my experience with regular expressions, regex should have found a 
match.  However, in this case regex.match() returns None.  Why is that? 
What am I missing?
    Thank you...





From google at mrabarnett.plus.com  Fri Feb  6 19:26:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 00:26:40 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmihh4$o2b$02$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>
	<gmihh4$o2b$02$1@news.t-online.com>
Message-ID: <498CD540.1080407@mrabarnett.plus.com>

dq wrote:
 > dq wrote:
 >> MRAB wrote:
 >>> dq wrote:
 >>>> Martin v. L?wis wrote:
 >>>>>> So does anyone know what the deal is with this?  Why is the
 >>>>>> same code so much slower on Windows?  Hope someone can tell
 >>>>>> me before a holy war erupts :-)
 >>>>>
 >>>>> Only the holy war can give an answer here. It certainly has
 >>>>> *nothing* to do with Python; Python calls the operating
 >>>>> system functions to read from the network and write to the
 >>>>> disk almost directly. So it must be the operating system
 >>>>> itself that slows it down.
 >>>>>
 >>>>> To investigate further, you might drop the write operating,
 >>>>> and measure only source.read(). If that is slower, then, for
 >>>>> some reason, the network speed is bad on Windows. Maybe you
 >>>>> have the network interfaces misconfigured? Maybe you are
 >>>>> using wireless on Windows, but cable on Linux? Maybe you have
 >>>>> some network filtering software running on Windows? Maybe
 >>>>> it's just that Windows sucks?-)
 >>>>>
 >>>>> If the network read speed is fine, but writing slows down, I
 >>>>> ask the same questions. Perhaps you have some virus scanner
 >>>>> installed that filters all write operations? Maybe Windows
 >>>>> sucks?
 >>>>>
 >>>>> Regards, Martin
 >>>>>
 >>>>
 >>>> Thanks for the ideas, Martin.  I ran a couple of experiments to
 >>>> find the culprit, by downloading the same 20 MB file from the
 >>>> same fast server. I compared:
 >>>>
 >>>> 1.  DL to HD vs USB iPod.
 >>>> 2.  AV on-access protection on vs. off
 >>>> 3.  "source. read()" only vs.  "file.write( source.read() )"
 >>>>
 >>>> The culprit is definitely the write speed on the iPod.  That
 >>>> is, everything runs plenty fast (~1 MB/s down) as long as I'm
 >>>> not writing directly to the iPod.  This is kind of odd, because
 >>>> if I copy the file over from the HD to the iPod using windows
 >>>> (drag-n-drop), it takes about a second or two, so about 10
 >>>> MB/s.
 >>>>
 >>>> So the problem is definitely partially Windows, but it also
 >>>> seems that Python's file.write() function is not without blame.
 >>>> It's the combination of Windows, iPod and Python's data stream
 >>>> that is slowing me down.
 >>>>
 >>>> I'm not really sure what I can do about this.  I'll experiment
 >>>> a little more and see if there's any way around this
 >>>> bottleneck.  If anyone has run into a problem like this, I'd
 >>>> love to hear about it...
 >>>>
 >>> You could try copying the file to the iPod using the command
 >>> line, or copying data from disk to iPod in, say, C, anything but
 >>> Python. This would allow you to identify whether Python itself
 >>> has anything to do with it.
 >>
 >> Well, I think I've partially identified the problem.  target.write(
 >> source.read() ) runs perfectly fast, copies 20 megs in about a
 >> second, from HD to iPod.  However, if I run the same code in a
 >> while loop, using a certain block size, say target.write(
 >> source.read(4096) ), it takes forever (or at least I'm still timing
 >> it while I write this post).
 >>
 >> The mismatch seems to be between urllib2's block size and the write
 >> speed of the iPod, I might try to tweak this a little in the code
 >> and see if it has any effect.
 >>
 >> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want
 >> to try to improve that...
 >
 > After some tweaking of the block size, I managed to get the DL speed
 > up to about 900 Mb/s.  It's still not quite Ubuntu, but it's a good
 > order of magnitude better.  The new DL code is pretty much this:
 >
 > """
 > blocksize = 2 ** 16    # plus or minus a power of 2
 > source = urllib2.urlopen( 'url://string' )
 > target = open( pathname, 'wb')
 > fullsize = float( source.info()['Content-Length'] )
 > DLd = 0
 > while DLd < fullsize:
 >     DLd = DLd + blocksize
 >     # optional:  write some DL progress info
 >     # somewhere, e.g. stdout
 > target.close()
 > source.close()
 > """
 >
I'd like to suggest that the block size you add to 'DLd' be the actual 
size of the returned block, just in case the read() doesn't return all 
you asked for (it might not be guaranteed, and the chances are that the
final block will be shorter, unless 'fullsize' happens to be a multiple
of 'blocksize').

If less is returned by read() then the while-loop might finish before
all the data has been downloaded, and if you just add 'blocksize' each
time it might end up > 'fullsize', ie apparently >100% downloaded!


From vlastimil.brom at gmail.com  Fri Feb  6 19:34:05 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 7 Feb 2009 01:34:05 +0100
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <9fdb569a0902061634u3488d8ebs37ea5132f0438ac0@mail.gmail.com>

2009/2/7 Just Another Victim of the Ambient Morality <ihatespam at hotmail.com>:
> ? ?I'm confused by this behaviour:
>
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
>
> ? ?In my experience with regular expressions, regex should have found a
> match. ?However, in this case regex.match() returns None. ?Why is that?
> What am I missing?
> ? ?Thank you...
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Try re.search() instead of match(), if nod only the beginning should
be checked for a match:
see
http://docs.python.org/library/re.html#matching-vs-searching

vbr


From google at mrabarnett.plus.com  Fri Feb  6 19:34:52 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 00:34:52 +0000
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <498CD72C.9010808@mrabarnett.plus.com>

Just Another Victim of the Ambient Morality wrote:
>     I'm confused by this behaviour:
> 
> 
> import re
> 
> regex = re.compile('foo')
> match = regex.match('whatfooever')
> 
> 
>     In my experience with regular expressions, regex should have found a 
> match.  However, in this case regex.match() returns None.  Why is that? 
> What am I missing?
>     Thank you...
> 
match() is anchored at (ie matches only at) the start of the string. You
need search(). It's in the docs! :-)


From apt.shansen at gmail.com  Fri Feb  6 19:34:54 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 16:34:54 -0800
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <7a9c25c20902061634o19210809la6573b54ba4528c9@mail.gmail.com>

>    In my experience with regular expressions, regex should have found a
> match.  However, in this case regex.match() returns None.  Why is that?
> What am I missing?

You want regex.search(). match specifically looks for the pattern from
the start of the screen, search anywhere.

--S


From robert.kern at gmail.com  Fri Feb  6 19:38:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 06 Feb 2009 18:38:16 -0600
Subject: Why doesn't this RE match?
In-Reply-To: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <gmil5p$ieh$1@ger.gmane.org>

On 2009-02-06 18:23, Just Another Victim of the Ambient Morality wrote:
>      I'm confused by this behaviour:
>
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
>
>      In my experience with regular expressions, regex should have found a
> match.  However, in this case regex.match() returns None.  Why is that?
> What am I missing?

http://docs.python.org/library/re#re.RegexObject.match

Basically, regex.match() tries to apply the regexp to the beginning of the 
string. Use regex.search() to search for a match later in the string.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bthayre at physics.ucsd.edu  Fri Feb  6 19:43:48 2009
From: bthayre at physics.ucsd.edu (Robocop)
Date: Fri, 6 Feb 2009 16:43:48 -0800 (PST)
Subject: Trouble sorting a list of objects by attributes
References: <49ddc228-c4ef-48b2-8fce-70f9e881e216@o40g2000prn.googlegroups.com>
	<20261325-e75d-4ed6-8c4b-7a4ec7ff2fc5@k1g2000prb.googlegroups.com> 
	<d049c2b9-c5e9-4f72-831e-4c94a3ed3262@w1g2000prk.googlegroups.com> 
	<3f1a6661-2bd6-4b12-aa79-03b055ce6745@a39g2000prl.googlegroups.com> 
	<mailman.9013.1233960096.3487.python-list@python.org>
Message-ID: <1325a031-2f3a-4e79-b7c9-0da32fbdee16@p23g2000prp.googlegroups.com>

On Feb 6, 2:41?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > I think there may have been a misunderstanding. ?I was already using
> > attrgetter, my problem is that it doesn't appear to be sorting by the
> > argument i give it. ?How does sort work with strings? ?How about with
> > datetime.time or datetime.date?
>
> You were using the attrgetter, but it looks like you weren't doing it correctly:
>
> ? ? timesheets.sort(key=operator.attrgetter('string'))
>
> You don't specify a type, be it string or date or anything: you
> specify the /name/ of the attribute to get. It'll handle sorting by
> any data type that has an order to it without you having to worry
> about it at all. Strings, ints, dates, times.
>
> It should be:
>
> ? ?timesheets.sort(key=operator.attrgetter("department"))
>
> If you want to sort by the value of the "department" attribute, which
> happens to be a string.
> If you want to sort by the "date" attribute, which happens to be a
> datetime.date, you do:
> ? ?timesheets.sort(key=operator.attrgetter("date"))
>
> Where date is not a datatype a la datetime.date, but the name of an
> attribute on your TimeSheet instances.
>
> --S

Yeah this i totally understand.  In my code i was using attrgetter
correctly, in the above answer i used string to represent the datatype
of the attribute, not what i actually put in there.  More my laziness
than anything else.  The problem boiled down attrgetter taking
multiple arguments in 2.5, but only one in 2.4.  Thanks for the input
though.


From sjmachin at lexicon.net  Fri Feb  6 19:55:41 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 6 Feb 2009 16:55:41 -0800 (PST)
Subject: Why doesn't this RE match?
References: <Aw4jl.69113$pp1.3477@en-nntp-06.dc1.easynews.com>
Message-ID: <e0b51d87-2f2b-4f28-9769-5bd8ee0d0ddd@40g2000prx.googlegroups.com>

On Feb 7, 11:23?am, "Just Another Victim of the Ambient Morality"
<ihates... at hotmail.com> wrote:
> ? ? I'm confused by this behaviour:
>
> import re
>
> regex = re.compile('foo')
> match = regex.match('whatfooever')
>
> ? ? In my experience with regular expressions, regex should have found a
> match. ?However, in this case regex.match() returns None. ?Why is that?

Because that is exactly what it is documented to do.

> What am I missing?

Inter alia:
(1) The whole section of the fantastic manual devoted to this topic:
http://www.python.org/doc/2.6/library/re.html#matching-vs-searching

(2) a section in the fabulous HOWTO:
http://www.python.org/doc/2.6/howto/regex.html#performing-matches

(3) the re section in the phantasmagorical help sub-system (very handy
if your internet connection goes on the fritz):

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> help(re)
Help on module re:
[snip]
    This module exports the following functions:
        match    Match a regular expression pattern to the beginning
of a string.
        search   Search a string for the presence of a pattern.
[snip]


From kenneth.m.mcdonald at sbcglobal.net  Fri Feb  6 19:58:01 2009
From: kenneth.m.mcdonald at sbcglobal.net (Kenneth McDonald)
Date: Fri, 6 Feb 2009 18:58:01 -0600
Subject: Possible to access MS Access 2007 password-protected database from
	Python?
Message-ID: <032DE756-C4E7-40E5-BE8F-D959EACD024B@sbcglobal.net>

Googling has shown me various ways of connecting to a non-password- 
protected Access database, but I was wondering if someone could point  
to code illustrating how to use an Access db that's password- 
protected. I haven't been able to find anything on this.

Thanks,
Ken


From dq at gmail.com  Fri Feb  6 20:51:13 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 02:51:13 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9017.1233966405.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>
	<mailman.9017.1233966405.3487.python-list@python.org>
Message-ID: <gmipei$7s0$02$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>> dq wrote:
>>> MRAB wrote:
>>>> dq wrote:
>>>>> Martin v. L?wis wrote:
>>>>>>> So does anyone know what the deal is with this?  Why is 
>>>>>>> the same code so much slower on Windows?  Hope someone 
>>>>>>> can tell me before a holy war erupts :-)
>>>>>> 
>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>  *nothing* to do with Python; Python calls the operating 
>>>>>> system functions to read from the network and write to the 
>>>>>> disk almost directly. So it must be the operating system 
>>>>>> itself that slows it down.
>>>>>> 
>>>>>> To investigate further, you might drop the write operating,
>>>>>>  and measure only source.read(). If that is slower, then, 
>>>>>> for some reason, the network speed is bad on Windows. Maybe
>>>>>>  you have the network interfaces misconfigured? Maybe you 
>>>>>> are using wireless on Windows, but cable on Linux? Maybe 
>>>>>> you have some network filtering software running on 
>>>>>> Windows? Maybe it's just that Windows sucks?-)
>>>>>> 
>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>  I ask the same questions. Perhaps you have some virus 
>>>>>> scanner installed that filters all write operations? Maybe
>>>>>>  Windows sucks?
>>>>>> 
>>>>>> Regards, Martin
>>>>>> 
>>>>> 
>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>  the same fast server. I compared:
>>>>> 
>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>> source.read() )"
>>>>> 
>>>>> The culprit is definitely the write speed on the iPod.  That 
>>>>> is, everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>> not writing directly to the iPod.  This is kind of odd, 
>>>>> because if I copy the file over from the HD to the iPod using
>>>>>  windows (drag-n-drop), it takes about a second or two, so 
>>>>> about 10 MB/s.
>>>>> 
>>>>> So the problem is definitely partially Windows, but it also 
>>>>> seems that Python's file.write() function is not without 
>>>>> blame. It's the combination of Windows, iPod and Python's 
>>>>> data stream that is slowing me down.
>>>>> 
>>>>> I'm not really sure what I can do about this.  I'll 
>>>>> experiment a little more and see if there's any way around 
>>>>> this bottleneck.  If anyone has run into a problem like this,
>>>>>  I'd love to hear about it...
>>>>> 
>>>> You could try copying the file to the iPod using the command 
>>>> line, or copying data from disk to iPod in, say, C, anything 
>>>> but Python. This would allow you to identify whether Python 
>>>> itself has anything to do with it.
>>> 
>>> Well, I think I've partially identified the problem. 
>>> target.write( source.read() ) runs perfectly fast, copies 20 megs
>>>  in about a second, from HD to iPod.  However, if I run the same
>>>  code in a while loop, using a certain block size, say 
>>> target.write( source.read(4096) ), it takes forever (or at least
>>>  I'm still timing it while I write this post).
>>> 
>>> The mismatch seems to be between urllib2's block size and the 
>>> write speed of the iPod, I might try to tweak this a little in 
>>> the code and see if it has any effect.
>>> 
>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might 
>>> want to try to improve that...
>> 
>> After some tweaking of the block size, I managed to get the DL 
>> speed up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>  a good order of magnitude better.  The new DL code is pretty much
>>  this:
>> 
>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while 
>> DLd < fullsize: DLd = DLd + blocksize # optional:  write some DL 
>> progress info # somewhere, e.g. stdout target.close() 
>> source.close() """
>> 
> I'd like to suggest that the block size you add to 'DLd' be the 
> actual size of the returned block, just in case the read() doesn't 
> return all you asked for (it might not be guaranteed, and the chances
>  are that the final block will be shorter, unless 'fullsize' happens
>  to be a multiple of 'blocksize').
> 
> If less is returned by read() then the while-loop might finish before
>  all the data has been downloaded, and if you just add 'blocksize' 
> each time it might end up > 'fullsize', ie apparently >100% 
> downloaded!

Interesting.  I'll if to see if any of the downloaded files end 
prematurely :)

btw, I forgot the most important line of the code!

"""
blocksize = 2 ** 16    # plus or minus a power of 2
source = urllib2.urlopen( 'url://string' )
target = open( pathname, 'wb')
fullsize = float( source.info()['Content-Length'] )
DLd = 0
while DLd < fullsize:
     #  +++
     target.write( source.read( blocksize ) )  # +++
     #  +++
     DLd = DLd + blocksize
     # optional:  write some DL progress info
     # somewhere, e.g. stdout
target.close()
source.close()
"""

Using that, I'm not quite sure where I can grab onto the value of how 
much was actually read from the block.  I suppose I could use an 
intermediate variable, read the data into it, measure the size, and then 
write it to the file stream, but I'm not sure it would be worth the 
overhead.  Or is there some other magic I should know about?

If I start to get that problem, at least I'll know where to look...


From jason at jvoegele.com  Fri Feb  6 21:11:15 2009
From: jason at jvoegele.com (Jason Voegele)
Date: Fri, 06 Feb 2009 21:11:15 -0500
Subject: Running all unit tests
Message-ID: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>

I'm working on my first substantial Python project, and I'm following a fully 
test-first approach.  I'd like to know how Pythonistas typically go about 
running all of their tests to ensure that my application stays "green".

In Ruby, I would have a Rake task so that I could say "rake test" and all 
tests would be executed.  In C or C++ I would have a make target so I could 
run all my tests with "make test".  In Java it would be an Ant task and "ant 
test".  And so forth and so on.

What's the recommended approach for Python programs?  I'm sure I could write 
a shell script (or a Python script even) that scans my "test" directory for 
test cases and runs them, but I'm wondering if there's something already 
built in that could do this for me.

-- 
Jason Voegele
Only fools are quoted.
		-- Anonymous




From google at mrabarnett.plus.com  Fri Feb  6 21:28:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 02:28:09 +0000
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <gmipei$7s0$02$1@news.t-online.com>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>	<mailman.9017.1233966405.3487.python-list@python.org>
	<gmipei$7s0$02$1@news.t-online.com>
Message-ID: <498CF1B9.70101@mrabarnett.plus.com>

dq wrote:
> MRAB wrote:
>> dq wrote:
>>> dq wrote:
>>>> MRAB wrote:
>>>>> dq wrote:
>>>>>> Martin v. L?wis wrote:
>>>>>>>> So does anyone know what the deal is with this?  Why is the same 
>>>>>>>> code so much slower on Windows?  Hope someone can tell me before 
>>>>>>>> a holy war erupts :-)
>>>>>>>
>>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>>  *nothing* to do with Python; Python calls the operating system 
>>>>>>> functions to read from the network and write to the disk almost 
>>>>>>> directly. So it must be the operating system itself that slows it 
>>>>>>> down.
>>>>>>>
>>>>>>> To investigate further, you might drop the write operating,
>>>>>>>  and measure only source.read(). If that is slower, then, for 
>>>>>>> some reason, the network speed is bad on Windows. Maybe
>>>>>>>  you have the network interfaces misconfigured? Maybe you are 
>>>>>>> using wireless on Windows, but cable on Linux? Maybe you have 
>>>>>>> some network filtering software running on Windows? Maybe it's 
>>>>>>> just that Windows sucks?-)
>>>>>>>
>>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>>  I ask the same questions. Perhaps you have some virus scanner 
>>>>>>> installed that filters all write operations? Maybe
>>>>>>>  Windows sucks?
>>>>>>>
>>>>>>> Regards, Martin
>>>>>>>
>>>>>>
>>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>>  the same fast server. I compared:
>>>>>>
>>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>>> source.read() )"
>>>>>>
>>>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>>>> everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>>> not writing directly to the iPod.  This is kind of odd, because if 
>>>>>> I copy the file over from the HD to the iPod using
>>>>>>  windows (drag-n-drop), it takes about a second or two, so about 
>>>>>> 10 MB/s.
>>>>>>
>>>>>> So the problem is definitely partially Windows, but it also seems 
>>>>>> that Python's file.write() function is not without blame. It's the 
>>>>>> combination of Windows, iPod and Python's data stream that is 
>>>>>> slowing me down.
>>>>>>
>>>>>> I'm not really sure what I can do about this.  I'll experiment a 
>>>>>> little more and see if there's any way around this bottleneck.  If 
>>>>>> anyone has run into a problem like this,
>>>>>>  I'd love to hear about it...
>>>>>>
>>>>> You could try copying the file to the iPod using the command line, 
>>>>> or copying data from disk to iPod in, say, C, anything but Python. 
>>>>> This would allow you to identify whether Python itself has anything 
>>>>> to do with it.
>>>>
>>>> Well, I think I've partially identified the problem. target.write( 
>>>> source.read() ) runs perfectly fast, copies 20 megs
>>>>  in about a second, from HD to iPod.  However, if I run the same
>>>>  code in a while loop, using a certain block size, say target.write( 
>>>> source.read(4096) ), it takes forever (or at least
>>>>  I'm still timing it while I write this post).
>>>>
>>>> The mismatch seems to be between urllib2's block size and the write 
>>>> speed of the iPod, I might try to tweak this a little in the code 
>>>> and see if it has any effect.
>>>>
>>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want 
>>>> to try to improve that...
>>>
>>> After some tweaking of the block size, I managed to get the DL speed 
>>> up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>>  a good order of magnitude better.  The new DL code is pretty much
>>>  this:
>>>
>>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while DLd 
>>> < fullsize: DLd = DLd + blocksize # optional:  write some DL progress 
>>> info # somewhere, e.g. stdout target.close() source.close() """
>>>
>> I'd like to suggest that the block size you add to 'DLd' be the actual 
>> size of the returned block, just in case the read() doesn't return all 
>> you asked for (it might not be guaranteed, and the chances
>>  are that the final block will be shorter, unless 'fullsize' happens
>>  to be a multiple of 'blocksize').
>>
>> If less is returned by read() then the while-loop might finish before
>>  all the data has been downloaded, and if you just add 'blocksize' 
>> each time it might end up > 'fullsize', ie apparently >100% downloaded!
> 
> Interesting.  I'll if to see if any of the downloaded files end 
> prematurely :)
> 
> btw, I forgot the most important line of the code!
> 
> """
> blocksize = 2 ** 16    # plus or minus a power of 2
> source = urllib2.urlopen( 'url://string' )
> target = open( pathname, 'wb')
> fullsize = float( source.info()['Content-Length'] )
> DLd = 0
> while DLd < fullsize:
>     #  +++
>     target.write( source.read( blocksize ) )  # +++
>     #  +++
>     DLd = DLd + blocksize
>     # optional:  write some DL progress info
>     # somewhere, e.g. stdout
> target.close()
> source.close()
> """
> 
> Using that, I'm not quite sure where I can grab onto the value of how 
> much was actually read from the block.  I suppose I could use an 
> intermediate variable, read the data into it, measure the size, and then 
> write it to the file stream, but I'm not sure it would be worth the 
> overhead.  Or is there some other magic I should know about?
> 
> If I start to get that problem, at least I'll know where to look...
> 
It's just:

     data = source.read(blocksize)
     target.write(data)
     DLd = DLd + len(data)

The overhead is tiny because you're not copying the data.

If 'x' refers to a 1MB bytestring and you do "y = x" or "foo(x)", you're 
not actually copying that bytestring; you're just making 'y' also refer 
to it or passing the reference to it into 'foo'. It's a bit passing 
pointers around, but without the nasty bits! :-)


From mdw at distorted.org.uk  Fri Feb  6 21:42:44 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Sat, 07 Feb 2009 02:42:44 +0000
Subject: Using while loop and if statement to tell if a binary has an odd
	or even number of 1's.
References: <6c1875c3-8283-4764-a481-ebfa135868bc@v5g2000pre.googlegroups.com>
	<Xns9BA9651C7D77Aduncanbooth@127.0.0.1>
Message-ID: <874oz7klwb.fsf.mdw@metalzone.distorted.org.uk>

Duncan Booth <duncan.booth at invalid.invalid> writes:

> Mark Dickinson <dickinsm at gmail.com> wrote:
[snip]
>>     while n:
>>         count += 1
>>         n &= n-1
>>     return count
>> 
>> is_even = count_set_bits(the_int) % 2 == 0
>> 
>> ...but anyone submitting this as a homework
>> solution had better be prepared to explain why
>> it works.
>> 
>
> I remember a programming exercise when I was an undergraduate and anyone 
> who *didn't* use that trick got marked down for writing inefficient
> code.

Curious.  I don't see why

        def parity(x):
          b = 2
          l = 1
          while True:
            b <<= l
            if x < b: break
            l <<= 1
          while l:
            b >>= l
            x ^= x >> l
            x &= b - 1
            l >>= 1
          return x & 1

is any less efficient.  Indeed, it seems more so to me.  The number of
top-level loop iterations is bounded by the logarithm of the total
number of bits in the input rather than the Hamming weight.  In terms of
single-precision operations (if we're dealing with bignums) the analysis
is more complicated; but the number of single-precision operations in
one of my loops is a linear function of l (assuming that the comparison
is done sensibly), and l increases and decreases geometrically, so I
have performance which is O(log x).  Assuming no special Hamming-weight
distribution on the input, the `efficient' version takes O(log^2 x)
single-precision operations.

Given an /a-priori/ upper bound on the length of the input, e.g., it
fits in a machine word, the above technique is still probably faster.
That is, assuming arithmetic and bitwise operations on integers take
constant time, my version runs in O(log log x) time whereas the
`efficient' version takes O(log x) time.

(My function returns the complement of the value requested.  Fixing it
is obviously trivial.)

-- [mdw]


From vlastimil.brom at gmail.com  Fri Feb  6 21:45:10 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sat, 7 Feb 2009 03:45:10 +0100
Subject: sys.exc_info() different between python 2.5.4 and 2.6.1?
Message-ID: <9fdb569a0902061845k31cffbb4l28927c2fc8ecb3a9@mail.gmail.com>

Hi all,
I just noticed a changed behaviour of sys.exc_info() between python
2.5.4 and 2.6.1 and wanted to ask, wheter it was intended, and how to
deal with the new state.

Some code triggers an error while opening a text file (windows 1250 -
with non-ascii characters) wrongly as utf-8,
this gets catched by a bare except clause.
Further the mentioned versions of python differ in handling sys.exc_info()
The following lines:
print sys.exc_info()[1]
print repr(sys.exc_info()[1])
print str(sys.exc_info()[1])
print unicode(sys.exc_info()[1])

result in python 2.5 in:

'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
UnicodeDecodeError('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte

in python 2.6 it is:
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
UnicodeDecodeError('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')
'utf8' codec can't decode byte 0x9a in position 2: unexpected code byte
('utf8', 'ab\x9acd', 2, 3, 'unexpected code byte')

Which is kind of confusing as my the excepthook function uses the
unicode() form of sys.exc_info()[1]
(The second part "ab\x9acd" is the whole content of the file being
read - which is normally quite a bit longer than this sample...)

Is this the expected behaviour? If so, what might be the reason for
differently outputting str() and unicode()?
How can this be dealt with, are the standard error values somehow
expected to be ascii, so that str() can be used reasonably?

Any hints are much appreciated,
  Vlasta


From darcymason at gmail.com  Fri Feb  6 21:46:39 2009
From: darcymason at gmail.com (Darcy Mason)
Date: Fri, 6 Feb 2009 18:46:39 -0800 (PST)
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <77db8f43-3196-41c9-bbfe-f7da9c27c4a6@r41g2000yqm.googlegroups.com>

On Feb 6, 9:11?pm, Jason Voegele <ja... at jvoegele.com> wrote:
> I'm working on my first substantial Python project, and I'm following a fully
> test-first approach. ?I'd like to know how Pythonistas typically go about
> running all of their tests to ensure that my application stays "green".
>
> In Ruby, I would have a Rake task so that I could say "rake test" and all
> tests would be executed. ?In C or C++ I would have a make target so I could
> run all my tests with "make test". ?In Java it would be an Ant task and "ant
> test". ?And so forth and so on.
>
> What's the recommended approach for Python programs? ?I'm sure I could write
> a shell script (or a Python script even) that scans my "test" directory for
> test cases and runs them, but I'm wondering if there's something already
> built in that could do this for me.
>
> --
> Jason Voegele
> Only fools are quoted.
> ? ? ? ? ? ? ? ? -- Anonymous

I don't know about the recommended approach, but I've done something
like you suggest in a library I authored. Any files named test*.py are
found and added to the unittest test suite.
See http://code.google.com/p/pydicom/source/browse/trunk/source/dicom/test/run_tests.py.
HTH
Darcy


From darcy at druid.net  Fri Feb  6 21:52:29 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 6 Feb 2009 21:52:29 -0500
Subject: Running all unit tests
In-Reply-To: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <20090206215229.f0951075.darcy@druid.net>

On Fri, 06 Feb 2009 21:11:15 -0500
Jason Voegele <jason at jvoegele.com> wrote:
> I'm working on my first substantial Python project, and I'm following a fully 
> test-first approach.  I'd like to know how Pythonistas typically go about 
> running all of their tests to ensure that my application stays "green".

I check in my unit tests to CVS along with the code and name the unit
test files with the form "TEST_xxx.py" to identify them.  I then put
the following script into my crontab so that my tests are run every
day.  I make the TEST_xxx.py executible so that I can always run a
specific test at any time if I am working on specific code.

Note that the script only sends email when something goes "red" so I
don't have to wade through "green" reports every day.  The errors stand
out that way.

#! /bin/sh
# $Id: run_unit_tests,v 1.4 2008/06/23 01:07:24 darcy Exp $

# This script runs all of the unit tests

if [ $# -lt 2 ]
then
    echo "Usage: $0 <base directory> [<email address>]"
    exit 1
fi

cd $1
trap "rm -f /tmp/run_tests.$$" 0
HOST=`hostname`

find -L . -type f -name 'TEST_*.py' | while read TEST
do
    $TEST > /tmp/run_tests.$$ 2>&1 ||
        mail -s "TEST failure on $HOST: $TEST" $2 < /tmp/run_tests.$$
done


-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From erobererunc at gmail.com  Fri Feb  6 22:18:37 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:18:37 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
Message-ID: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>

Somebody much more intelligent than I said today that someone told him that
Python lists are just dictionaries with lists hashed by integers.  Since he
said that someone else told him this, I piped up and said that I thought
that wasn't true.  I looked at the source code for lists in python, and I
did not expressly remember seeing dictionaries.  Unfortunately I am not
somewhere where I can easily look at the code right now (I'm logged into
Windows!), and I might not realize exactly what I'm looking at anyways, but
I'd like to extend an apology to the guy soon if I was wrong.  So, can
anyone tell me if lists are really just dictionaries?  Thanks!
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From erobererunc at gmail.com  Fri Feb  6 22:24:08 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:24:08 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <775033410902061924l6997998dh617fa72c4852d098@mail.gmail.com>

Correction, the first sentence should read, "lists are just dictionaries
keyed with integers."

On Fri, Feb 6, 2009 at 10:18 PM, er <erobererunc at gmail.com> wrote:

> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!
>
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From clp2 at rebertia.com  Fri Feb  6 22:25:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 19:25:08 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!

They most certainly are not. This is Python, not Lua or PHP (where for
reasons I cannot fathom, they've seen fit to conflate dictionaries and
lists; although it does make slightly more sense in Lua's case)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bignose+hates-spam at benfinney.id.au  Fri Feb  6 22:29:30 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 07 Feb 2009 14:29:30 +1100
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <877i42x6ud.fsf@benfinney.id.au>

Jason Voegele <jason at jvoegele.com> writes:

> What's the recommended approach for Python programs? I'm sure I
> could write a shell script (or a Python script even) that scans my
> "test" directory for test cases and runs them, but I'm wondering if
> there's something already built in that could do this for me.

The lack of a built-in ?collect and run all the tests in this working
tree? in the Python unit test system is a known problem; discussions
are ongoing what to do about it.

Meanwhile, the third-party ?nose? system
<URL:http://somethingaboutorange.com/mrl/projects/nose/> provides this
and much more, while remaining compatible with both testing systems in
the standard library.

I generally set up a ?test? target in my Makefile, such that it will
use ?nosetests? to collect and run all the tests; then I just run
?make test? in a loop that is triggered by any filesystem change in my
project working tree.

-- 
 \        ?I have a microwave fireplace in my house. The other night I |
  `\   laid down in front of the fire for the evening in two minutes.? |
_o__)                                                   ?Steven Wright |
Ben Finney


From roy at panix.com  Fri Feb  6 22:32:20 2009
From: roy at panix.com (Roy Smith)
Date: Fri, 6 Feb 2009 19:32:20 -0800 (PST)
Subject: Portable way to refer to the null device?
Message-ID: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>

I need to run a command using subprocess.Popen() and have stdin
connected to the null device.  On unix, I would do:

        self.process = subprocess.Popen(argv,
                                        env=new_env,
                                        stdout=open(outfile, 'w'),
                                        stderr=open(errfile, 'w'),
                                        stdin=open('/dev/null')
                                        )

but that's not portable to windows.  Does Python have a portable way
to get a file object connected to the null device, regardless of what
operating system you're running on?



From erobererunc at gmail.com  Fri Feb  6 22:32:31 2009
From: erobererunc at gmail.com (er)
Date: Fri, 6 Feb 2009 22:32:31 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
Message-ID: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>

Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
was actually part of the discussion that brought up this nugget.
Nevertheless, any details you care to provide about the details.  I'm going
to dive into the source code in more depth tomorrow, just so I can get a
better understanding anyway, but I'd love to hear some details, or see any
links, if you have them.

On Fri, Feb 6, 2009 at 10:25 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
> > Somebody much more intelligent than I said today that someone told him
> that
> > Python lists are just dictionaries with lists hashed by integers.  Since
> he
> > said that someone else told him this, I piped up and said that I thought
> > that wasn't true.  I looked at the source code for lists in python, and I
> > did not expressly remember seeing dictionaries.  Unfortunately I am not
> > somewhere where I can easily look at the code right now (I'm logged into
> > Windows!), and I might not realize exactly what I'm looking at anyways,
> but
> > I'd like to extend an apology to the guy soon if I was wrong.  So, can
> > anyone tell me if lists are really just dictionaries?  Thanks!
>
> They most certainly are not. This is Python, not Lua or PHP (where for
> reasons I cannot fathom, they've seen fit to conflate dictionaries and
> lists; although it does make slightly more sense in Lua's case)
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From clp2 at rebertia.com  Fri Feb  6 22:44:09 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 19:44:09 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
Message-ID: <50697b2c0902061944p16054f68r7bd9175e9fddbdf7@mail.gmail.com>

> On Fri, Feb 6, 2009 at 10:25 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Fri, Feb 6, 2009 at 7:18 PM, er <erobererunc at gmail.com> wrote:
>> > Somebody much more intelligent than I said today that someone told him
>> > that
>> > Python lists are just dictionaries with lists hashed by integers.  Since
>> > he
>> > said that someone else told him this, I piped up and said that I thought
>> > that wasn't true.  I looked at the source code for lists in python, and
>> > I
>> > did not expressly remember seeing dictionaries.  Unfortunately I am not
>> > somewhere where I can easily look at the code right now (I'm logged into
>> > Windows!), and I might not realize exactly what I'm looking at anyways,
>> > but
>> > I'd like to extend an apology to the guy soon if I was wrong.  So, can
>> > anyone tell me if lists are really just dictionaries?  Thanks!
>>
>> They most certainly are not. This is Python, not Lua or PHP (where for
>> reasons I cannot fathom, they've seen fit to conflate dictionaries and
>> lists; although it does make slightly more sense in Lua's case)
>>
On Fri, Feb 6, 2009 at 7:32 PM, er <erobererunc at gmail.com> wrote:
> Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
> was actually part of the discussion that brought up this nugget.
> Nevertheless, any details you care to provide about the details.  I'm going
> to dive into the source code in more depth tomorrow, just so I can get a
> better understanding anyway, but I'd love to hear some details, or see any
> links, if you have them.

Unfortunately, I don't know the details as I'm not a CPython dev. I
only indirectly know that arrays are used from having read so
previously in writings talking about the implementation. Also, Python
generally tries to make its basic datatypes speedy, and using
dictionaries to implement lists would be completely counter to that
goal, no matter how excellent the dictionary implementation is.

In all likelihood, someone who /is/ familiar with the implementation
will probably chime in with the actual details.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From skip at pobox.com  Fri Feb  6 22:51:13 2009
From: skip at pobox.com (skip at pobox.com)
Date: Fri, 6 Feb 2009 21:51:13 -0600
Subject: Portable way to refer to the null device?
In-Reply-To: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <18829.1329.91043.255369@montanaro.dyndns.org>


    Roy> I need to run a command using subprocess.Popen() and have stdin
    Roy> connected to the null device. 

os.path.devnull should do what you want:

    >>> os.path.devnull
    '/dev/null'
    >>> import ntpath
    >>> ntpath.devnull
    'nul'

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From bignose+hates-spam at benfinney.id.au  Fri Feb  6 23:07:09 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 07 Feb 2009 15:07:09 +1100
Subject: Portable way to refer to the null device?
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <871vuax53m.fsf@benfinney.id.au>

Roy Smith <roy at panix.com> writes:

> I need to run a command using subprocess.Popen() and have stdin
> connected to the null device.  On unix, I would do:
> 
>         self.process = subprocess.Popen(argv,
>                                         env=new_env,
>                                         stdout=open(outfile, 'w'),
>                                         stderr=open(errfile, 'w'),
>                                         stdin=open('/dev/null')
>                                         )

Yikes, that's a nasty indentation you've got going on there. I'd be
writing the above as:

    self.process = subprocess.Popen(
        argv,
        env=new_env,
        stdout=open(outfile, 'w'),
        stderr=open(errfile, 'w'),
        stdin=open('/dev/null'),
        )

> but that's not portable to windows.  Does Python have a portable way
> to get a file object connected to the null device, regardless of what
> operating system you're running on?

Almost: the ?os.devnull? attribute is documented (in the documentation
for the ?os? module) as ?os.devnull is the file path of the null
device ('/dev/null', etc.)?.

So the above becomes:

    self.process = subprocess.Popen(
        argv,
        env=new_env,
        stdout=open(outfile, 'w'),
        stderr=open(errfile, 'w'),
        stdin=open(os.devnull),
        )

-- 
 \         ?Pinky, are you pondering what I'm pondering?? ?I think so, |
  `\         Brain, but how will we get a pair of Abe Vigoda's pants?? |
_o__)                                           ?_Pinky and The Brain_ |
Ben Finney


From vincent at vincentdavis.net  Fri Feb  6 23:16:02 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Fri, 6 Feb 2009 21:16:02 -0700
Subject: simple web app, where to start
Message-ID: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>

I have a simple script that takes a few input values and returns a csv file
and a few stats. If I wanted to host this on the web how would I. I have no
idea where to begin. If someone could point me in the right direction like
maybe a tutorial, tools I will need, functions..... I would appreciate it.I
know a little html but am not sure how to integrate python or know what
servers will handle it .....

Thanks
Vincent Davis
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From aioe.org at technicalbloke.com  Fri Feb  6 23:19:24 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Fri, 06 Feb 2009 23:19:24 -0500
Subject: Returning a variable number of things...
References: <gmi0og$4cl$1@aioe.org>
	<mailman.8999.1233946637.3487.python-list@python.org>
Message-ID: <gmj23t$vt2$1@aioe.org>

Chris Rebert wrote:
> On Fri, Feb 6, 2009 at 10:50 AM, r0g <aioe.org at technicalbloke.com> wrote:
>> Hi There,
>>
>> I have a function that uses *args to accept a variable number of
>> parameters and I would like it to return a variable number of objects.
>>
>> I could return a list but I would like to take advantage of tuple
>> unpacking with the return values e.g.
> 
> Despite its name, tuple unpacking works with lists too.
> 
> Cheers,
> Chris
> 

Ah so it does! Thanks Chris! I'm losing count of all the reasons I have
to love this language :-)


From clp2 at rebertia.com  Fri Feb  6 23:37:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 6 Feb 2009 20:37:28 -0800
Subject: WebError documentation?
In-Reply-To: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
Message-ID: <50697b2c0902062037w572445f1t42ca2a29d8ec60f0@mail.gmail.com>

On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> Is there any?  Where is it?  Extensive Googling has proven fruitless.

It's not a standard Python exception. A third-party library you're
using must be raising it. Check the exception traceback.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From michele.simionato at gmail.com  Fri Feb  6 23:40:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 6 Feb 2009 20:40:20 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
Message-ID: <9b81090e-4a29-4feb-bcf3-c5ba26c20188@o36g2000yqh.googlegroups.com>

On Feb 6, 10:23?pm, Rhamphoryncus <rha... at gmail.com> wrote:
> On Feb 5, 1:16?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Feb 5, 7:24?pm, a... at pythoncraft.com (Aahz) wrote:
>
> > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > Michele Simionato ?<michele.simion... at gmail.com> wrote:
>
> > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > >flatten generic iterables or only lists).
>
> > > Of course, once you do that, you need to special-case strings...
>
> > Strings are iterable but have no __iter__ method, which is fine in
> > this context, since I would say 99.9% of times one wants to treat them
> > as atomic objects, so no need to special case.
>
> Don't worry, that little oddity was fixed for you:

Acc! I have a few places in my code with checks of the
kind ``hasattr(x, '__iter__')`` and I guess those spots
will be tricky when converting to Python 3. I guess
2to3 cannot help either :-(


From apt.shansen at gmail.com  Fri Feb  6 23:47:52 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 6 Feb 2009 20:47:52 -0800
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>
	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
Message-ID: <7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>

On Fri, Feb 6, 2009 at 7:32 PM, er <erobererunc at gmail.com> wrote:
> Thanks Chris.  Lua tables are one of my favorite linguistic traits, which
> was actually part of the discussion that brought up this nugget.
> Nevertheless, any details you care to provide about the details.  I'm going
> to dive into the source code in more depth tomorrow, just so I can get a
> better understanding anyway, but I'd love to hear some details, or see any
> links, if you have them.

Yeah, as Chris said, Python lists are not dictionaries at all. They're
PyObjects that contain an array of pointers to other PyObjects. Basic
Python types try to be efficient and reliable. They're not always the
perfect choice, but they strive to be good enough for most situations
in terms of both functionality and speed... and while they have put a
lot of effort into tuning Python's hash implementation, an array has
to beat it hands down when you're implementing an ordered sequence.

Now, I believe Python sets *are* for all intents and purposes
dictionaries, but I think that's just because its the easiest and most
efficient way to implement their uniqueness properties; they took the
very-well-tuned dictionary implementation and cut out the stuff not
needed by sets and did some tweaks here or there. I /believe/.

--S


From exarkun at divmod.com  Sat Feb  7 00:15:20 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Sat, 7 Feb 2009 00:15:20 -0500
Subject: Running all unit tests
In-Reply-To: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
Message-ID: <20090207051520.12853.2145202965.divmod.quotient.6828@henry.divmod.com>

On Fri, 06 Feb 2009 21:11:15 -0500, Jason Voegele <jason at jvoegele.com> wrote:
>I'm working on my first substantial Python project, and I'm following a fully
>test-first approach.  I'd like to know how Pythonistas typically go about
>running all of their tests to ensure that my application stays "green".
>
>In Ruby, I would have a Rake task so that I could say "rake test" and all
>tests would be executed.  In C or C++ I would have a make target so I could
>run all my tests with "make test".  In Java it would be an Ant task and "ant
>test".  And so forth and so on.
>
>What's the recommended approach for Python programs?  I'm sure I could write
>a shell script (or a Python script even) that scans my "test" directory for
>test cases and runs them, but I'm wondering if there's something already
>built in that could do this for me.

There are a bunch of tools for this.  I use trial (part of Twisted), which
will collect your tests, run them, and report the results (and has helpers
for debugging, profiling, and some other stuff) and buildbot.

Jean-Paul


From rdmurray at bitdance.com  Sat Feb  7 00:21:45 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 05:21:45 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
Message-ID: <gmj5p8$ggp$1@ger.gmane.org>

Quoth Mensanator <mensanator at aol.com>:
> On Feb 6, 3:23=A0pm, Rhamphoryncus <rha... at gmail.com> wrote:
> > On Feb 5, 1:16=A0pm, Michele Simionato <michele.simion... at gmail.com>
> > wrote:
> >
> > > On Feb 5, 7:24=A0pm, a... at pythoncraft.com (Aahz) wrote:
> > > > In article <a22c77c4-a812-4e42-8972-6f3eedf72... at l33g2000pri.googlegroups.com>,
> > > > Michele Simionato =A0<michele.simion... at gmail.com> wrote:
> > > > >Looks fine to me. In some situations you may also use hasattr(el,
> > > > >'__iter__') instead of isinstance(el, list) (it depends if you want to
> > > > >flatten generic iterables or only lists).
> > > > Of course, once you do that, you need to special-case strings...
> >
> > > Strings are iterable but have no __iter__ method, which is fine in
> > > this context, since I would say 99.9% of times one wants to treat them
> > > as atomic objects, so no need to special case.
> >
> > Don't worry, that little oddity was fixed for you:
> >
> >     Python 3.0+ (unknown, Dec =A08 2008, 14:26:15)
> >     [GCC 4.3.2] on linux2
> >     Type "help", "copyright", "credits" or "license" for more information.
> >     >>>  str.__iter__
> >     <slot wrapper '__iter__' of 'str' objects
> >     >>> bytes.__iter__
> >     <slot wrapper '__iter__' of 'bytes' objects
> >     >>> bytearray.__iter__
> >     <slot wrapper '__iter__' of 'bytearray' objects>
> >
> > I'm in the "why do you need more than 1 depth?" camp. Dispatching
> > based on your own type should be given an extra look. Dispatching
> > based passed in types should be given three extra looks.
> >
> > I didn't realize itertools.chain(*iterable) worked. I guess that
> > needs to be pushed as the canonical form.
> 
> What about this (from the Recipes section of the itertools manual)?
> 
> def flatten(listOfLists):
>     return list(chain.from_iterable(listOfLists))

    Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
    [GCC 4.3.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from itertools import chain
    >>> list(chain.from_iterable([1, 2, [3, 4]]))
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: 'int' object is not iterable
    >>> list(chain(*[1, 2, [3, 4]]))
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: 'int' object is not iterable
    >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
    ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]

--RDM



From ntwrkd at gmail.com  Sat Feb  7 00:41:30 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Fri, 6 Feb 2009 21:41:30 -0800
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <f257b9ab0902062141r2a0f8d64vd541d1f06cf9d5f2@mail.gmail.com>

have a loo at the django framework

http://www.djangoproject.com/

On Fri, Feb 6, 2009 at 8:16 PM, Vincent Davis <vincent at vincentdavis.net> wrote:
> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.
> I know a little html but am not sure how to integrate python or know what
> servers will handle it .....
> Thanks
> Vincent Davis
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From terry.yinzhe at gmail.com  Sat Feb  7 00:50:12 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Fri, 6 Feb 2009 21:50:12 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
Message-ID: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>

I used a CPD (copy/paste detector) in PMD to analyze the code
duplication in Python source code. I found that Python3.0 contains
more duplicated code than the previous versions. The CPD tool is far
from perfect, but I still feel the analysis makes some sense.

|Source Code      | NLOC     | Dup60   | Dup30   | Rate60    | Rate 30
|
Python1.5(Core)   19418       1072        3023      6%           16%
Python2.5(Core)   35797       1656        6441      5%           18%
Python3.0(Core)   40737       3460        9076      8%           22%
Apache(server)     18693       1114        2553      6%           14%

NLOC: The net lines of code
Dup60: Lines of code that has 60 continuous tokens duplicated to other
code (counted twice or more)
Dup30: 30 tokens duplicated
Rate60: Dup60/NLOC
Rate30: Dup30/NLOC

We can see that the common duplicated rate is tended to be stable. But
Python3.0 is slightly bigger than that. Consider the small increase in
NLOC, the duplication rate of Python3.0 might be too big.

Does that say something about the code quality of Python3.0?


From tjreedy at udel.edu  Sat Feb  7 02:31:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 07 Feb 2009 02:31:20 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <gmjdc8$tp4$1@ger.gmane.org>

er wrote:
> Somebody much more intelligent than I said today that someone told him 
> that Python lists are just dictionaries with lists hashed by integers.  

Abstractly, which is to say, behaviorally, a Python list is a sequence 
class as defined under Built-in Types in the Library manual. 
Dictionaries are a mapping class.  The two categories have different 
methods.  So at this level, the claim is nonsensical, wrong by 
definition.  A list *must* have it n entries indexed from 0 to n-1 and 
dicts do not and could not enforce such an invariant.

Concretely, an implementation could do as claimed under the covers, but 
CPython and I suspect all the other implementations actually use 
extensible arrays.  People *do* use dicts for sparse arrays, but then 
they are *not* sequences.

Good for you for asking here.

Terry Jan Reedy



From martin at v.loewis.de  Sat Feb  7 02:36:36 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 08:36:36 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
Message-ID: <498D3A04.60503@v.loewis.de>

> Does that say something about the code quality of Python3.0?

Not necessarily. IIUC, copying a single file with 2000 lines
completely could already account for that increase.

It would be interesting to see what specific files have gained
large numbers of additional files, compared to 2.5.

Regards,
Martin


From tjreedy at udel.edu  Sat Feb  7 02:37:19 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 07 Feb 2009 02:37:19 -0500
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <1233850000.12935.4.camel@localhost.localdomain>
References: <gmf2e5$9b3$1@ger.gmane.org>
	<1233850000.12935.4.camel@localhost.localdomain>
Message-ID: <gmjdng$ua8$1@ger.gmane.org>

Albert Hopkins wrote:
> Probably that [c.l.]python is becoming more popular and, like most
> things as they become popular, it loses its "purity"... much like the
> Internet in the early 1990s.

Several years ago when I proposed the addition of list.pop(), a couple 
of people accused me of trying to ruin Python (by spoiling its 'purity', 
I guess).  There were some other unfriendly things said a few years 
later, by and to various people, in the discussion of integer division. 
  So I think python-list has become more friendly since.

Terry Jan Reedy



From rNOSPAMon at flownet.com  Sat Feb  7 03:06:08 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Sat, 07 Feb 2009 00:06:08 -0800
Subject: WebError documentation?
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
Message-ID: <rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>

In article <mailman.9037.1233981452.3487.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> > Is there any?  Where is it?  Extensive Googling has proven fruitless.
> 
> It's not a standard Python exception. A third-party library you're
> using must be raising it. Check the exception traceback.

I see I did not make myself clear.  I meant the Python software package 
called "weberror", not a generic web error.

http://pypi.python.org/pypi/WebError


rg


From jstroud at mbi.ucla.edu  Sat Feb  7 04:04:47 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sat, 07 Feb 2009 01:04:47 -0800
Subject: Is c.l.py becoming less friendly?
In-Reply-To: <mailman.8909.1233854801.3487.python-list@python.org>
References: <gmf2e5$9b3$1@ger.gmane.org>
	<mailman.8909.1233854801.3487.python-list@python.org>
Message-ID: <Q8cjl.17121$c45.14917@nlpi065.nbdc.sbc.com>

Tim Chase wrote:
> Is this where we tell you to shut up? <gdr> ;-)

Don't you mean STFU?



-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From rhamph at gmail.com  Sat Feb  7 04:06:06 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sat, 7 Feb 2009 01:06:06 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
Message-ID: <76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>

On Feb 6, 10:21?pm, rdmur... at bitdance.com wrote:
> Quoth Mensanator <mensana... at aol.com>:
> > def flatten(listOfLists):
> > ? ? return list(chain.from_iterable(listOfLists))
>
> ? ? Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> ? ? [GCC 4.3.2] on linux2
> ? ? Type "help", "copyright", "credits" or "license" for more information.
> ? ? >>> from itertools import chain
> ? ? >>> list(chain.from_iterable([1, 2, [3, 4]]))
> ? ? Traceback (most recent call last):
> ? ? ? File "<stdin>", line 1, in <module>
> ? ? TypeError: 'int' object is not iterable
> ? ? >>> list(chain(*[1, 2, [3, 4]]))
> ? ? Traceback (most recent call last):
> ? ? ? File "<stdin>", line 1, in <module>
> ? ? TypeError: 'int' object is not iterable
> ? ? >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> ? ? ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]

What usecase do you have for such inconsistently structured data?

If I'm building a tree I use my own type for the nodes, keeping them
purely internal, so I can always use isinstance without worrying about
getting something inconvenient passed in.


From dq at gmail.com  Sat Feb  7 04:36:14 2009
From: dq at gmail.com (dq)
Date: Sat, 07 Feb 2009 10:36:14 +0100
Subject: urllib2 performance on windows, usb connection
In-Reply-To: <mailman.9023.1233973692.3487.python-list@python.org>
References: <gmgp38$m2s$00$1@news.t-online.com>	<498beb5a$0$3305$9b622d9e@news.freenet.de>	<gmi8u3$bms$01$1@news.t-online.com>	<mailman.9008.1233957283.3487.python-list@python.org>	<gmie0f$3e7$03$1@news.t-online.com>	<gmihh4$o2b$02$1@news.t-online.com>	<mailman.9017.1233966405.3487.python-list@python.org>	<gmipei$7s0$02$1@news.t-online.com>
	<mailman.9023.1233973692.3487.python-list@python.org>
Message-ID: <gmjkmg$q4b$02$1@news.t-online.com>

MRAB wrote:
> dq wrote:
>> MRAB wrote:
>>> dq wrote:
>>>> dq wrote:
>>>>> MRAB wrote:
>>>>>> dq wrote:
>>>>>>> Martin v. L?wis wrote:
>>>>>>>>> So does anyone know what the deal is with this?  Why is the 
>>>>>>>>> same code so much slower on Windows?  Hope someone can tell me 
>>>>>>>>> before a holy war erupts :-)
>>>>>>>>
>>>>>>>> Only the holy war can give an answer here. It certainly has
>>>>>>>>  *nothing* to do with Python; Python calls the operating system 
>>>>>>>> functions to read from the network and write to the disk almost 
>>>>>>>> directly. So it must be the operating system itself that slows 
>>>>>>>> it down.
>>>>>>>>
>>>>>>>> To investigate further, you might drop the write operating,
>>>>>>>>  and measure only source.read(). If that is slower, then, for 
>>>>>>>> some reason, the network speed is bad on Windows. Maybe
>>>>>>>>  you have the network interfaces misconfigured? Maybe you are 
>>>>>>>> using wireless on Windows, but cable on Linux? Maybe you have 
>>>>>>>> some network filtering software running on Windows? Maybe it's 
>>>>>>>> just that Windows sucks?-)
>>>>>>>>
>>>>>>>> If the network read speed is fine, but writing slows down,
>>>>>>>>  I ask the same questions. Perhaps you have some virus scanner 
>>>>>>>> installed that filters all write operations? Maybe
>>>>>>>>  Windows sucks?
>>>>>>>>
>>>>>>>> Regards, Martin
>>>>>>>>
>>>>>>>
>>>>>>> Thanks for the ideas, Martin.  I ran a couple of experiments
>>>>>>>  to find the culprit, by downloading the same 20 MB file from
>>>>>>>  the same fast server. I compared:
>>>>>>>
>>>>>>> 1.  DL to HD vs USB iPod. 2.  AV on-access protection on vs.
>>>>>>>  off 3.  "source. read()" only vs.  "file.write(
>>>>>>> source.read() )"
>>>>>>>
>>>>>>> The culprit is definitely the write speed on the iPod.  That is, 
>>>>>>> everything runs plenty fast (~1 MB/s down) as long as I'm
>>>>>>> not writing directly to the iPod.  This is kind of odd, because 
>>>>>>> if I copy the file over from the HD to the iPod using
>>>>>>>  windows (drag-n-drop), it takes about a second or two, so about 
>>>>>>> 10 MB/s.
>>>>>>>
>>>>>>> So the problem is definitely partially Windows, but it also seems 
>>>>>>> that Python's file.write() function is not without blame. It's 
>>>>>>> the combination of Windows, iPod and Python's data stream that is 
>>>>>>> slowing me down.
>>>>>>>
>>>>>>> I'm not really sure what I can do about this.  I'll experiment a 
>>>>>>> little more and see if there's any way around this bottleneck.  
>>>>>>> If anyone has run into a problem like this,
>>>>>>>  I'd love to hear about it...
>>>>>>>
>>>>>> You could try copying the file to the iPod using the command line, 
>>>>>> or copying data from disk to iPod in, say, C, anything but Python. 
>>>>>> This would allow you to identify whether Python itself has 
>>>>>> anything to do with it.
>>>>>
>>>>> Well, I think I've partially identified the problem. target.write( 
>>>>> source.read() ) runs perfectly fast, copies 20 megs
>>>>>  in about a second, from HD to iPod.  However, if I run the same
>>>>>  code in a while loop, using a certain block size, say 
>>>>> target.write( source.read(4096) ), it takes forever (or at least
>>>>>  I'm still timing it while I write this post).
>>>>>
>>>>> The mismatch seems to be between urllib2's block size and the write 
>>>>> speed of the iPod, I might try to tweak this a little in the code 
>>>>> and see if it has any effect.
>>>>>
>>>>> Oh, there we go:   20 megs in 135.8 seconds.  Yeah... I might want 
>>>>> to try to improve that...
>>>>
>>>> After some tweaking of the block size, I managed to get the DL speed 
>>>> up to about 900 Mb/s.  It's still not quite Ubuntu, but it's
>>>>  a good order of magnitude better.  The new DL code is pretty much
>>>>  this:
>>>>
>>>> """ blocksize = 2 ** 16    # plus or minus a power of 2 source = 
>>>> urllib2.urlopen( 'url://string' ) target = open( pathname, 'wb') 
>>>> fullsize = float( source.info()['Content-Length'] ) DLd = 0 while 
>>>> DLd < fullsize: DLd = DLd + blocksize # optional:  write some DL 
>>>> progress info # somewhere, e.g. stdout target.close() source.close() 
>>>> """
>>>>
>>> I'd like to suggest that the block size you add to 'DLd' be the 
>>> actual size of the returned block, just in case the read() doesn't 
>>> return all you asked for (it might not be guaranteed, and the chances
>>>  are that the final block will be shorter, unless 'fullsize' happens
>>>  to be a multiple of 'blocksize').
>>>
>>> If less is returned by read() then the while-loop might finish before
>>>  all the data has been downloaded, and if you just add 'blocksize' 
>>> each time it might end up > 'fullsize', ie apparently >100% downloaded!
>>
>> Interesting.  I'll if to see if any of the downloaded files end 
>> prematurely :)
>>
>> btw, I forgot the most important line of the code!
>>
>> """
>> blocksize = 2 ** 16    # plus or minus a power of 2
>> source = urllib2.urlopen( 'url://string' )
>> target = open( pathname, 'wb')
>> fullsize = float( source.info()['Content-Length'] )
>> DLd = 0
>> while DLd < fullsize:
>>     #  +++
>>     target.write( source.read( blocksize ) )  # +++
>>     #  +++
>>     DLd = DLd + blocksize
>>     # optional:  write some DL progress info
>>     # somewhere, e.g. stdout
>> target.close()
>> source.close()
>> """
>>
>> Using that, I'm not quite sure where I can grab onto the value of how 
>> much was actually read from the block.  I suppose I could use an 
>> intermediate variable, read the data into it, measure the size, and 
>> then write it to the file stream, but I'm not sure it would be worth 
>> the overhead.  Or is there some other magic I should know about?
>>
>> If I start to get that problem, at least I'll know where to look...
>>
> It's just:
> 
>     data = source.read(blocksize)
>     target.write(data)
>     DLd = DLd + len(data)
> 
> The overhead is tiny because you're not copying the data.
> 
> If 'x' refers to a 1MB bytestring and you do "y = x" or "foo(x)", you're 
> not actually copying that bytestring; you're just making 'y' also refer 
> to it or passing the reference to it into 'foo'. It's a bit passing 
> pointers around, but without the nasty bits! :-)

Yeah, that's about what I was thinking, although not quite as 
succintly.  Thanks for the help!


From duncan.booth at invalid.invalid  Sat Feb  7 05:01:28 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 7 Feb 2009 10:01:28 GMT
Subject: subprocess returncode windows
References: <a54e16c0-f1ce-4a55-8593-8982641c5f3b@f33g2000vbf.googlegroups.com>
	<mailman.5728.1229453705.3487.python-list@python.org>
	<18348eae-5af1-47e9-a198-b95d4fcb6eac@a12g2000pro.googlegroups.com>
	<mailman.5741.1229469071.3487.python-list@python.org>
	<851774bd-5019-4347-8815-36782dcec4b6@p2g2000prf.googlegroups.com>
	<mailman.8946.1233890231.3487.python-list@python.org>
	<8ac1c027-3bd4-43ae-99a9-012462cb06d7@r37g2000prr.googlegroups.com>
Message-ID: <Xns9BAB65FC53B37duncanbooth@127.0.0.1>

Andrew <andrew.replogle at gmail.com> wrote:

> As well as not using that and removing "endlocal" which
> I admit I have no clue what that does.

Python isn't the only system in the world to include a help command.

C:\>help endlocal
Ends localization of environment changes in a batch file.
Environment changes made after ENDLOCAL has been issued are
not local to the batch file; the previous settings are not
restored on termination of the batch file.

ENDLOCAL

If Command Extensions are enabled ENDLOCAL changes as follows:

If the corresponding SETLOCAL enable or disabled command extensions
using the new ENABLEEXTENSIONS or DISABLEEXTENSIONS options, then
after the ENDLOCAL, the enabled/disabled state of command extensions
will be restored to what it was prior to the matching SETLOCAL
command execution.


From terry.yinzhe at gmail.com  Sat Feb  7 05:51:07 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 02:51:07 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
Message-ID: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>

On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Does that say something about the code quality of Python3.0?
>
> Not necessarily. IIUC, copying a single file with 2000 lines
> completely could already account for that increase.
>
> It would be interesting to see what specific files have gained
> large numbers of additional files, compared to 2.5.
>
> Regards,
> Martin

But the duplication are always not very big, from about 100 lines
(rare) to less the 5 lines. As you can see the Rate30 is much bigger
than Rate60, that means there are a lot of small duplications.


From deets at nospam.web.de  Sat Feb  7 06:10:17 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 07 Feb 2009 12:10:17 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
Message-ID: <6v58gpFi7nnvU1@mid.uni-berlin.de>

Terry schrieb:
> On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
>>> Does that say something about the code quality of Python3.0?
>> Not necessarily. IIUC, copying a single file with 2000 lines
>> completely could already account for that increase.
>>
>> It would be interesting to see what specific files have gained
>> large numbers of additional files, compared to 2.5.
>>
>> Regards,
>> Martin
> 
> But the duplication are always not very big, from about 100 lines
> (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> than Rate60, that means there are a lot of small duplications.

Do you by any chance have a few examples of these? There is a lot of 
idiomatic code in python to e.g. acquire and release the GIL or doing 
refcount-stuff. If that happens to be done with rather generic names as 
arguments, I can well imagine that as being the cause.

Diez


From Laundro at gmail.com  Sat Feb  7 07:18:45 2009
From: Laundro at gmail.com (LaundroMat)
Date: Sat, 7 Feb 2009 04:18:45 -0800 (PST)
Subject: Trouble with regular expressions
Message-ID: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>

Hi,

I'm quite new to regular expressions, and I wonder if anyone here
could help me out.

I'm looking to split strings that ideally look like this: "Update: New
item (Household)" into a group.
This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
("Update", "New item", "(Household)")

Some strings will look like this however: "Update: New item (item)
(Household)". The expression above still does its job, as it returns
("Update", "New item (item)", "(Household)").

It does not work however when there is no text in parentheses (eg
"Update: new item"). How can I get the expression to return a tuple
such as ("Update:", "new item", None)?

Thanks in advance,

Mathieu


From jason at jvoegele.com  Sat Feb  7 07:54:23 2009
From: jason at jvoegele.com (Jason Voegele)
Date: Sat, 07 Feb 2009 07:54:23 -0500
Subject: Running all unit tests
References: <Uvydna26BehLcBHUnZ2dnUVZ_ozinZ2d@insightbb.com>
	<877i42x6ud.fsf@benfinney.id.au>
Message-ID: <kYadnfIFEsziGRDUnZ2dnUVZ_ovinZ2d@insightbb.com>

Ben Finney wrote:
> Jason Voegele <jason at jvoegele.com> writes:
> 
>> What's the recommended approach for Python programs? I'm sure I
>> could write a shell script (or a Python script even) that scans my
>> "test" directory for test cases and runs them, but I'm wondering if
>> there's something already built in that could do this for me.
> 
> The lack of a built-in ???collect and run all the tests in this working
> tree??? in the Python unit test system is a known problem; discussions
> are ongoing what to do about it.
> 
> Meanwhile, the third-party ???nose??? system
> <URL:http://somethingaboutorange.com/mrl/projects/nose/> provides this
> and much more, while remaining compatible with both testing systems in
> the standard library.
> 
> I generally set up a ???test??? target in my Makefile, such that it will
> use ???nosetests??? to collect and run all the tests; then I just run
> ???make test??? in a loop that is triggered by any filesystem change in my
> project working tree.

Thanks to all for the helpful responses.  It's good to know I'm not the only 
one that has thought of this as a shortcoming.

-- 
Jason Voegele
Different all twisty a of in maze are you, passages little.




From gslindstrom at gmail.com  Sat Feb  7 07:56:22 2009
From: gslindstrom at gmail.com (gslindstrom)
Date: Sat, 7 Feb 2009 06:56:22 -0600
Subject: PyCon 2009 Tutorial Days
Message-ID: <a9f39a410902070456r75d0c794md32b1de47869c5ba@mail.gmail.com>

Registration for PyCon 2009 <http://us.pycon.org/2009/registration/> (US) is
open.  Because of the popularity of the tutorials in years past, this year
features 2 days of tutorials <http://us.pycon.org/2009/tutorials> (32 total
class on Wednesday, March 25 and Thursday, March 26) including:

   - 2 tracks on Introduciton to Python
   - Working with Excel
spreadsheets<http://us.pycon.org/2009/tutorials/schedule/1AM8/>
   - GIS with Python <http://us.pycon.org/2009/tutorials/schedule/1PM4/>
   - Django <http://us.pycon.org/2009/tutorials/schedule/1PM2/>
   - Concurrency <http://us.pycon.org/2009/tutorials/schedule/1PM6/> and
   Kamaelia <http://us.pycon.org/2009/tutorials/schedule/1AM7/>
   - Testing <http://us.pycon.org/2009/tutorials/schedule/2AM2/>
   - SQLAlchemy <http://us.pycon.org/2009/tutorials/schedule/2AM4/>
   - Advanced topics
   <http://us.pycon.org/2009/tutorials/schedule/>
   - much, much more <http://us.pycon.org/2009/tutorials/schedule/>

These classes are being presented by some of the smartest cookies in the
Python community and are 3-hours each (with break).  You get to rub
shoulders with other Python programmers who share your interests and all
sessions have time for you to ask questions.  There is a (modest) cost to
attend, but you will get great training as well as class notes.  We even
feed you lunch and provide snacks during the breaks.

Click http://us.pycon.org/2009/about/ for more information.  Questions?
Email us at pycon-tutorials at python.org.

Greg Lindstrom
Tutorial Coordinator
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From terry.yinzhe at gmail.com  Sat Feb  7 08:36:07 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:36:07 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <5ae6f965-f983-47da-a9e7-ed47397f1317@i18g2000prf.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example 1:
Found a 64 line (153 tokens) duplication in the following files:
Starting at line 73 of D:\DOWNLOADS\Python-3.0\Python\thread_pth.h
Starting at line 222 of D:\DOWNLOADS\Python-3.0\Python
\thread_pthread.h

	return (long) threadid;
#else
	return (long) *(long *) &threadid;
#endif
}

static void
do_PyThread_exit_thread(int no_cleanup)
{
	dprintf(("PyThread_exit_thread called\n"));
	if (!initialized) {
		if (no_cleanup)
			_exit(0);
		else
			exit(0);
	}
}

void
PyThread_exit_thread(void)
{
	do_PyThread_exit_thread(0);
}

void
PyThread__exit_thread(void)
{
	do_PyThread_exit_thread(1);
}

#ifndef NO_EXIT_PROG
static void
do_PyThread_exit_prog(int status, int no_cleanup)
{
	dprintf(("PyThread_exit_prog(%d) called\n", status));
	if (!initialized)
		if (no_cleanup)
			_exit(status);
		else
			exit(status);
}

void
PyThread_exit_prog(int status)
{
	do_PyThread_exit_prog(status, 0);
}

void
PyThread__exit_prog(int status)
{
	do_PyThread_exit_prog(status, 1);
}
#endif /* NO_EXIT_PROG */

#ifdef USE_SEMAPHORES

/*
 * Lock support.
 */

PyThread_type_lock
PyThread_allocate_lock(void)
{



From terry.yinzhe at gmail.com  Sat Feb  7 08:36:36 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:36:36 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example 2:
Found a 16 line (106 tokens) duplication in the following files:
Starting at line 4970 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5015 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5073 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

                                PyErr_Format(PyExc_TypeError,
"GeneratorExp field \"generators\" must be a list, not a %.200s", tmp-
>ob_type->tp_name);
                                goto failed;
                        }
                        len = PyList_GET_SIZE(tmp);
                        generators = asdl_seq_new(len, arena);
                        if (generators == NULL) goto failed;
                        for (i = 0; i < len; i++) {
                                comprehension_ty value;
                                res = obj2ast_comprehension
(PyList_GET_ITEM(tmp, i), &value, arena);
                                if (res != 0) goto failed;
                                asdl_seq_SET(generators, i, value);
                        }
                        Py_XDECREF(tmp);
                        tmp = NULL;
                } else {
                        PyErr_SetString(PyExc_TypeError, "required
field \"generators\" missing from GeneratorExp");



From terry.yinzhe at gmail.com  Sat Feb  7 08:38:02 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:38:02 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <3ff230fd-65fc-4e6a-b943-d290a021b8f2@w24g2000prd.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example of a small one (61 token duplicated):
Found a 19 line (61 tokens) duplication in the following files:
Starting at line 132 of D:\DOWNLOADS\Python-3.0\Python\modsupport.c
Starting at line 179 of D:\DOWNLOADS\Python-3.0\Python\modsupport.c

		PyTuple_SET_ITEM(v, i, w);
	}
	if (itemfailed) {
		/* do_mkvalue() should have already set an error */
		Py_DECREF(v);
		return NULL;
	}
	if (**p_format != endchar) {
		Py_DECREF(v);
		PyErr_SetString(PyExc_SystemError,
				"Unmatched paren in format");
		return NULL;
	}
	if (endchar)
		++*p_format;
	return v;
}

static PyObject *



From terry.yinzhe at gmail.com  Sat Feb  7 08:39:42 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:39:42 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <65261947-714a-46d6-8769-2a32bf56caa1@p23g2000prp.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

Example of a even small one (30 token duplicated):
Found a 11 line (30 tokens) duplication in the following files:
Starting at line 2551 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
Starting at line 3173 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

        if (PyObject_SetAttrString(result, "ifs", value) == -1)
                goto failed;
        Py_DECREF(value);
        return result;
failed:
        Py_XDECREF(value);
        Py_XDECREF(result);
        return NULL;
}

PyObject*



From terry.yinzhe at gmail.com  Sat Feb  7 08:42:00 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 05:42:00 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
Message-ID: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>

On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Terry schrieb:
>
> > On 2?7?, ??3?36?, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> >>> Does that say something about the code quality of Python3.0?
> >> Not necessarily. IIUC, copying a single file with 2000 lines
> >> completely could already account for that increase.
>
> >> It would be interesting to see what specific files have gained
> >> large numbers of additional files, compared to 2.5.
>
> >> Regards,
> >> Martin
>
> > But the duplication are always not very big, from about 100 lines
> > (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> > than Rate60, that means there are a lot of small duplications.
>
> Do you by any chance have a few examples of these? There is a lot of
> idiomatic code in python to e.g. acquire and release the GIL or doing
> refcount-stuff. If that happens to be done with rather generic names as
> arguments, I can well imagine that as being the cause.
>
> Diez

And I'm not saying that you can not have duplication in code. But it
seems that the stable & successful software releases tend to have
relatively stable duplication rate.


From cosmo_general at yahoo.com  Sat Feb  7 08:47:27 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Sat, 7 Feb 2009 05:47:27 -0800 (PST)
Subject: urllib2: problem of handling space in parameter
Message-ID: <3afe6c35-7610-47ea-8165-115e41a11763@13g2000yql.googlegroups.com>

Hi Folks,

I encrountered a problem of using urllib2: the space handling. Look at
the code below:

import urllib2
url = r'http://somedomain.com/a.cgi?name=muddy coder&password=foobar
cgi_back = urllib2.urlopen(url).read()

In this cgi_back, I saw field password worked fine, but field name
not, only muddy was picked up by CGI. So, I had to cover the space, by
using syntax name=muddy-coder, it went through. So, I presume urllib2
may have an approach of handling white space in this regard. Can
anybody help? Thanks!

Muddy Coder


From aquagnu at gmail.com  Sat Feb  7 08:50:18 2009
From: aquagnu at gmail.com (Yosifov Pavel)
Date: Sat, 7 Feb 2009 05:50:18 -0800 (PST)
Subject: typedef (type alias) and ctypes
Message-ID: <99a964c1-85a0-4139-93a3-e8bce614cccb@o11g2000yql.googlegroups.com>

I try to create type aliases, like typedef in C (a specially aliases
to ctypes objects). This case:

>>> some_type = c_ulong
>>> oth_type = c_ulong

works in all cases but not with type qualification:

>>> t1 = c_ulong # reference to c_ulong, nothing else :(
>>> t2 = c_ulong
>>> x = t1()
>>> y = t2()
>>> type(x)==type(y)
True

This trivial way for typedef doesn't allow to determine real type and
it's absolutely right :)

>>> t1 = type('t1',(c_ulong,),{})
>>> t2 = type('t2',(c_ulong,),{})
>>> x = t1()
>>> y = t2()
>>> type(x)==type(y)
False

The problem:
1st way work in complex using of ctypes (interfacing with some DLLs),
but doesn't allow to determine real type!
2st way allows to determine real type, but "access violation reading
0x0000000C'" occurs in some DLL calls!

Question: what "warts", errors are in 2nd way (may be reason of access
violation)?

--
Pavel


From rdmurray at bitdance.com  Sat Feb  7 09:16:42 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 14:16:42 +0000 (UTC)
Subject: urllib2: problem of handling space in parameter
References: <3afe6c35-7610-47ea-8165-115e41a11763@13g2000yql.googlegroups.com>
Message-ID: <gmk54a$ka1$1@ger.gmane.org>

Quoth Muddy Coder <cosmo_general at yahoo.com>:
> Hi Folks,
> 
> I encrountered a problem of using urllib2: the space handling. Look at
> the code below:
> 
> import urllib2
> url = r'http://somedomain.com/a.cgi?name=muddy coder&password=foobar
> cgi_back = urllib2.urlopen(url).read()
> 
> In this cgi_back, I saw field password worked fine, but field name
> not, only muddy was picked up by CGI. So, I had to cover the space, by
> using syntax name=muddy-coder, it went through. So, I presume urllib2
> may have an approach of handling white space in this regard. Can
> anybody help? Thanks!

urllib.urlencode.  Unecoded spaces aren't actually valid in a URL.

--David



From sjmachin at lexicon.net  Sat Feb  7 09:18:07 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 06:18:07 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
Message-ID: <65540e37-69a0-4664-a258-a5b0543c0ecd@s9g2000prg.googlegroups.com>

On Feb 7, 11:18?pm, LaundroMat <Laun... at gmail.com> wrote:
> Hi,
>
> I'm quite new to regular expressions, and I wonder if anyone here
> could help me out.
>
> I'm looking to split strings that ideally look like this: "Update: New
> item (Household)" into a group.
> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> ("Update", "New item", "(Household)")
>
> Some strings will look like this however: "Update: New item (item)
> (Household)". The expression above still does its job, as it returns
> ("Update", "New item (item)", "(Household)").
>
> It does not work however when there is no text in parentheses (eg
> "Update: new item"). How can I get the expression to return a tuple
> such as ("Update:", "new item", None)?

I don't see how it can be done without some post-matching adjustment.
Try this:

C:\junk>type mathieu.py
import re

tests = [
    "Update: New item (Household)",
    "Update: New item (item) (Household)",
    "Update: new item",
    "minimal",
    "parenthesis (plague) (has) (struck)",
    ]

regex = re.compile("""
    (Update:)?      # optional prefix
    \s*             # ignore whitespace
    ([^()]*)        # any non-parentheses stuff
    (\([^()]*\))?   # optional (blahblah)
    \s*            # ignore whitespace
    (\([^()]*\))?   # another optional (blahblah)
    $
    """, re.VERBOSE)

for i, test in enumerate(tests):
    print "Test #%d: %r" % (i, test)
    m = regex.match(test)
    if not m:
        print "No match"
    else:
        g = m.groups()
        print g
        if g[3] is not None:
            x = (g[0], g[1] + g[2], g[3])
        else:
            x = g[:3]
        print x
        print

C:\junk>mathieu.py
Test #0: 'Update: New item (Household)'
('Update:', 'New item ', '(Household)', None)
('Update:', 'New item ', '(Household)')

Test #1: 'Update: New item (item) (Household)'
('Update:', 'New item ', '(item)', '(Household)')
('Update:', 'New item (item)', '(Household)')

Test #2: 'Update: new item'
('Update:', 'new item', None, None)
('Update:', 'new item', None)

Test #3: 'minimal'
(None, 'minimal', None, None)
(None, 'minimal', None)

Test #4: 'parenthesis (plague) (has) (struck)'
No match

HTH,
John


From geekmail at usenot.de  Sat Feb  7 09:21:22 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:21:22 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
Message-ID: <20090207152122.683de28e@usenot.de>

I've found something in the spirit of the following (in the epydoc
sources, if you care):

if True:
    print "outer if"
    for t in range(2):
        if True:
            print "for if"
    else:
        print "phantom else"

For the life of me I can't place the "else". Which if clause does it
belong to? None, it would seem from running the above snippet:

outer if
For if
For if
Phantom else

It seems that there is a for...else construct. Replacing the inner if
with pass seems to confirm this. The else clause is still executed.

What's broken here: Python or my brain?

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From rdmurray at bitdance.com  Sat Feb  7 09:25:02 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 14:25:02 +0000 (UTC)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
Message-ID: <gmk5jt$lgt$1@ger.gmane.org>

Rhamphoryncus <rhamph at gmail.com> wrote:
> On Feb 6, 10:21=A0pm, rdmur... at bitdance.com wrote:
> > Quoth Mensanator <mensana... at aol.com>:
> > > def flatten(listOfLists):
> > > =A0 =A0 return list(chain.from_iterable(listOfLists))
> >
> > =A0 =A0 Python 2.6.1 (r261:67515, Jan =A07 2009, 17:09:13)
> > =A0 =A0 [GCC 4.3.2] on linux2
> > =A0 =A0 Type "help", "copyright", "credits" or "license" for more informa=
> tion.
> > =A0 =A0 >>> from itertools import chain
> > =A0 =A0 >>> list(chain.from_iterable([1, 2, [3, 4]]))
> > =A0 =A0 Traceback (most recent call last):
> > =A0 =A0 =A0 File "<stdin>", line 1, in <module>
> > =A0 =A0 TypeError: 'int' object is not iterable
> > =A0 =A0 >>> list(chain(*[1, 2, [3, 4]]))
> > =A0 =A0 Traceback (most recent call last):
> > =A0 =A0 =A0 File "<stdin>", line 1, in <module>
> > =A0 =A0 TypeError: 'int' object is not iterable
> > =A0 =A0 >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> > =A0 =A0 ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]
> 
> What usecase do you have for such inconsistently structured data?
> 
> If I'm building a tree I use my own type for the nodes, keeping them
> purely internal, so I can always use isinstance without worrying about
> getting something inconvenient passed in.

I don't have any use cases myself, I'm just pointing out that this
doesn't answer the concerns of the OP, who presumably does.

--RDM



From mdemenko at gmail.com  Sat Feb  7 09:27:24 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Sat, 07 Feb 2009 15:27:24 +0100
Subject: py2exe and distutils
Message-ID: <gmk5o8$g34$00$1@news.t-online.com>

Hi,
i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
Now i can't list installed modules, here is the stacktrace:



help> modules

Please wait a moment while I gather a list of all available modules...

Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Programme\Python25\lib\site.py", line 346, in __call__
     return pydoc.help(*args, **kwds)
   File "C:\Programme\Python25\lib\pydoc.py", line 1649, in __call__
     self.interact()
   File "C:\Programme\Python25\lib\pydoc.py", line 1667, in interact
     self.help(request)
   File "C:\Programme\Python25\lib\pydoc.py", line 1683, in help
     elif request == 'modules': self.listmodules()
   File "C:\Programme\Python25\lib\pydoc.py", line 1804, in listmodules
     ModuleScanner().run(callback)
   File "C:\Programme\Python25\lib\pydoc.py", line 1855, in run
     for importer, modname, ispkg in pkgutil.walk_packages():
   File "C:\Programme\Python25\lib\pkgutil.py", line 110, in walk_packages
     __import__(name)
   File 
"C:\Programme\Python25\Lib\site-packages\setuptools\__init__.py", line 
2, in <module>
     from setuptools.extension import Extension, Library
   File 
"C:\Programme\Python25\Lib\site-packages\setuptools\extension.py", line 
2, in <module>
     from dist import _get_unpatched
   File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
line 27, in <module>
     _Distribution = _get_unpatched(_Distribution)
   File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
line 23, in _get_unpatched
     "distutils has already been patched by %r" % cls
AssertionError: distutils has already been patched by <class 
py2exe.Distribution at 0x011B4F90>

Any suggestion, how to fix this issue?

Best regards

Maxim


From geekmail at usenot.de  Sat Feb  7 09:27:53 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:27:53 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <20090207152753.6526a574@usenot.de>

On Sat, 7 Feb 2009 15:21:22 +0100 Andreas Waldenburger
<geekmail at usenot.de> wrote:

> outer if
> For if
> For if
> Phantom else
> 
Geez, I'm a moron. This is obviously not the output from the snippet.
But if you fix the capitalization, it is. Sorry for that.

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From steve at pearwood.info  Sat Feb  7 09:28:00 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 08 Feb 2009 01:28:00 +1100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <019d9052$0$20640$c3e8da3@news.astraweb.com>

Andreas Waldenburger wrote:

> It seems that there is a for...else construct. Replacing the inner if
> with pass seems to confirm this. The else clause is still executed.

Yes, there is a for...else construct.

The else block runs if the for loop exits *without* a break.

for i in range(20):
    if i == 10: break
else:
    print "no break here"

for i in range(20):
    if i == 100: break
else:
    print "no break here"


> What's broken here: Python or my brain?

Perhaps we should not answer that question.


-- 
Steven



From __peter__ at web.de  Sat Feb  7 09:32:54 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 07 Feb 2009 15:32:54 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
Message-ID: <gmk62j$dje$03$1@news.t-online.com>

Andreas Waldenburger wrote:

> I've found something in the spirit of the following (in the epydoc
> sources, if you care):
> 
> if True:
>     print "outer if"
>     for t in range(2):
>         if True:
>             print "for if"
>     else:
>         print "phantom else"
> 
> For the life of me I can't place the "else". Which if clause does it
> belong to? None, it would seem from running the above snippet:
> 
> outer if
> For if
> For if
> Phantom else
> 
> It seems that there is a for...else construct. Replacing the inner if
> with pass seems to confirm this. The else clause is still executed.
> 
> What's broken here: Python or my brain?

Your rtfm sensor?

http://docs.python.org/reference/compound_stmts.html#the-for-statement

In short, the else suite is executed unless the for-loop is left
via 'break':

>>> for i in [1]:
...     break
... else:
...     print "else"
...
>>> for i in [1]:
...     pass
... else:
...     print "else"
...
else
>>>

Peter


From geekmail at usenot.de  Sat Feb  7 09:34:59 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sat, 7 Feb 2009 15:34:59 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
Message-ID: <20090207153459.123c5706@usenot.de>

On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
<steve at pearwood.info> wrote:

> Andreas Waldenburger wrote:
> 
> > It seems that there is a for...else construct. Replacing the inner
> > if with pass seems to confirm this. The else clause is still
> > executed.
> 
> Yes, there is a for...else construct.
> 
That's something. In 6+ years of Python programming I've never seen or
heard of this thing. This might be useful, apparently.


> [snip]
> 
> > What's broken here: Python or my brain?
> 
> Perhaps we should not answer that question.
> 
I did phrase that rather provocatively, didn't I?

Well thanks. I'll try to learn less noisily in the future. :)

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From google at mrabarnett.plus.com  Sat Feb  7 09:37:31 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 14:37:31 +0000
Subject: Trouble with regular expressions
In-Reply-To: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
Message-ID: <498D9CAB.9090900@mrabarnett.plus.com>

LaundroMat wrote:
> Hi,
> 
> I'm quite new to regular expressions, and I wonder if anyone here
> could help me out.
> 
> I'm looking to split strings that ideally look like this: "Update: New
> item (Household)" into a group.
> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> ("Update", "New item", "(Household)")
> 
> Some strings will look like this however: "Update: New item (item)
> (Household)". The expression above still does its job, as it returns
> ("Update", "New item (item)", "(Household)").
> 
> It does not work however when there is no text in parentheses (eg
> "Update: new item"). How can I get the expression to return a tuple
> such as ("Update:", "new item", None)?
> 
You need to make the last group optional and also make the middle group 
lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.

(?:...) is the non-capturing version of (...).

If you don't make the middle group lazy then it'll capture the rest of 
the string and the last group would never match anything!


From andrew at acooke.org  Sat Feb  7 09:42:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 7 Feb 2009 11:42:05 -0300 (CLST)
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <019d9052$0$20640$c3e8da3@news.astraweb.com>
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
Message-ID: <e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>


there's a justification for this awful mess here -
http://mail.python.org/pipermail/python-3000/2006-March/000104.html

i didn't know about this, and even after reading steven's broken (i
assume) example, managed to get it backwards.

the else is if there *isn't* a break and is for search loops (see link
above).

(it's still in 3).

andrew


Steven D'Aprano wrote:
> Andreas Waldenburger wrote:
>
>> It seems that there is a for...else construct. Replacing the inner if
>> with pass seems to confirm this. The else clause is still executed.
>
> Yes, there is a for...else construct.
>
> The else block runs if the for loop exits *without* a break.
>
> for i in range(20):
>     if i == 10: break
> else:
>     print "no break here"
>
> for i in range(20):
>     if i == 100: break
> else:
>     print "no break here"
>
>
>> What's broken here: Python or my brain?
>
> Perhaps we should not answer that question.
>
>
> --
> Steven
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From google at mrabarnett.plus.com  Sat Feb  7 09:44:25 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 14:44:25 +0000
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <20090207153459.123c5706@usenot.de>
References: <20090207152122.683de28e@usenot.de>	<019d9052$0$20640$c3e8da3@news.astraweb.com>
	<20090207153459.123c5706@usenot.de>
Message-ID: <498D9E49.6070001@mrabarnett.plus.com>

Andreas Waldenburger wrote:
> On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
> <steve at pearwood.info> wrote:
> 
>> Andreas Waldenburger wrote:
>>
>>> It seems that there is a for...else construct. Replacing the inner
>>> if with pass seems to confirm this. The else clause is still
>>> executed.
>> Yes, there is a for...else construct.
>>
> That's something. In 6+ years of Python programming I've never seen or
> heard of this thing. This might be useful, apparently.
> 
One use case is:

for x in list_of_items:
     if x.value == desired_value:
         desired_name = x.name
         break
else:
    print "Couldn't find %s" % x.value

> 
>> [snip]
>>
>>> What's broken here: Python or my brain?
>> Perhaps we should not answer that question.
>>
> I did phrase that rather provocatively, didn't I?
> 
> Well thanks. I'll try to learn less noisily in the future. :)
> 



From REMpeteOVE at CAPpetezilla.ITALSco.uk  Sat Feb  7 09:46:17 2009
From: REMpeteOVE at CAPpetezilla.ITALSco.uk (Peter Chant)
Date: Sat, 07 Feb 2009 14:46:17 +0000
Subject: Newbie SWMixer / numpy help - AssertionError
Message-ID: <pej066x0mc.ln2@phoenix.fire>

Hello,

I'm a bit of a python newby.  I want to play and record sound
simultaneously.  SWMixer seems able to do this but the examples use WAV
files.  I'm trying to play a test tone.  Can anyone give me a steer as to
why this fails?

import sys
import swmixer
import numpy


swmixer.init(samplerate=44100, chunksize=1024, stereo=False,
microphone=True)
#snd = swmixer.Sound("test1.wav")
time = 1
freq = 440
time = numpy.linspace(0,1,44100*time)       # 44100 numbers between 0 and 1
tone_data = numpy.sin(time*2*numpy.pi*freq) # A above Middle C
snd = swmixer.Sound(tone_data)

snd.play(loops=-1)

I know this may be in a little at the deep end for someone who has just
started to learn python, but I find I learn a lot faster if I try to do
something that is useful.

Pete


-- 
http://www.petezilla.co.uk


From mail at joaomoreno.com  Sat Feb  7 09:55:06 2009
From: mail at joaomoreno.com (mail at joaomoreno.com)
Date: Sat, 7 Feb 2009 06:55:06 -0800 (PST)
Subject: BaseHTTPRequestHandler freezes while writing to self.wfile after 
	installing Python 3.0
Message-ID: <ffdee1a1-109a-4bfa-a1ec-5717cfbcaf44@u14g2000yqg.googlegroups.com>

Hey guys,

I'm starting to lose my head with this one.

I have a class that extends BaseHTTPRequestHandler. It works fine on
Python 2.5. And yesterday I was curious and decided to install Python
3.0 on my Mac (I followed this tutorial, to be sure I wasn't messing
things up: http://farmdev.com/thoughts/66/python-3-0-on-mac-os-x-alongside-2-6-2-5-etc-/
). I tried my application on Python 3.0 and the code just freezed on
this line:

self.wfile.write(f.read())

I searched and got to this bug http://bugs.python.org/issue3826 . I
couldn't understand if there's already a fix for that. But, the
strangest thing was that, when I tried my application on 2.5, it
started freezing on the same spot! I then removed everything I
installed from 3.0, fixed the paths, and it still gives me the error.
I don't know what else to do.

The app works fine on 2.5, because I tried it on another computer.

Thanks for your help.


From floatingpeanut at gmail.com  Sat Feb  7 10:00:55 2009
From: floatingpeanut at gmail.com (floatingpeanut)
Date: Sat, 7 Feb 2009 07:00:55 -0800 (PST)
Subject: Is c.l.py becoming less friendly?
References: <gmf2e5$9b3$1@ger.gmane.org>
	<1233850000.12935.4.camel@localhost.localdomain> 
	<mailman.9043.1233992252.3487.python-list@python.org>
Message-ID: <d6c6cb2f-322a-4cda-ac1d-d988f34af779@s20g2000yqh.googlegroups.com>

On Feb 7, 2:37?am, Terry Reedy <tjre... at udel.edu> wrote:
> ? So I think python-list has become more friendly since.

I've experienced the same sort of thing. About a year ago (I think)
there were one or more regulars here who were often somewhat rude,
unfriendly, or snobbish (not naming any names). Trouble was, they were
experienced and often helpful too so the behaviour was mostly
tolerated.

Haven't seen that sort of thing in a while though. c.l.py is a very
friendly place these days.


From deets at nospam.web.de  Sat Feb  7 10:45:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 07 Feb 2009 16:45:28 +0100
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <gmk62j$dje$03$1@news.t-online.com>
References: <20090207152122.683de28e@usenot.de>
	<gmk62j$dje$03$1@news.t-online.com>
Message-ID: <6v5okoFi8vgdU2@mid.uni-berlin.de>

Peter Otten schrieb:
> Andreas Waldenburger wrote:
> 
>> I've found something in the spirit of the following (in the epydoc
>> sources, if you care):
>>
>> if True:
>>     print "outer if"
>>     for t in range(2):
>>         if True:
>>             print "for if"
>>     else:
>>         print "phantom else"
>>
>> For the life of me I can't place the "else". Which if clause does it
>> belong to? None, it would seem from running the above snippet:
>>
>> outer if
>> For if
>> For if
>> Phantom else
>>
>> It seems that there is a for...else construct. Replacing the inner if
>> with pass seems to confirm this. The else clause is still executed.
>>
>> What's broken here: Python or my brain?
> 
> Your rtfm sensor?
> 
> http://docs.python.org/reference/compound_stmts.html#the-for-statement
> 
> In short, the else suite is executed unless the for-loop is left
> via 'break':

Or exceptions of course. Might be obvious, but for completeness' sake.

Diez


From dave.nuttall at blueyonder.co.uk  Sat Feb  7 10:52:53 2009
From: dave.nuttall at blueyonder.co.uk (David Nuttall)
Date: Sat, 7 Feb 2009 15:52:53 -0000
Subject: Beginner Python OpenGL difficulties
Message-ID: <20090207163720.4FD351E4002@bag.python.org>

Hi Mike,

            I am just getting into OPENGL from Python. But I am having
problems. Each time I try to run some OPENGL code I get the following sort
of error:

 

Traceback (most recent call last):

  File "C:\Documents and Settings\Owner\My Documents\My Work\Python
Modules\PyOpenGL-Demo-3.0.0b6\PyOpenGL-Demo\NeHe\lesson1.py", line 142, in
<module>

    main()

  File "C:\Documents and Settings\Owner\My Documents\My Work\Python
Modules\PyOpenGL-Demo-3.0.0b6\PyOpenGL-Demo\NeHe\lesson1.py", line 97, in
main

    glutInit(sys.argv)

  File "C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py", line 316, in
glutInit

    _base_glutInit( ctypes.byref(count), holder )

  File "C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py", line 57, in
_base_glutInit

    return __glutInitWithExit(pargc, argv, _exitfunc)

  File "C:\Python25\Lib\site-packages\OpenGL\platform\baseplatform.py", line
280, in __call__

    self.__name__, self.__name__,

NullFunctionError: Attempt to call an undefined function __glutInitWithExit,
check for bool(__glutInitWithExit) before calling

 

I can only think that the installation might be wrong. I have an AMD machine
running Win32 - XP.

 

Hope you can help me?

 

Best regards

 

Dave

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From notvalid2 at sbcglobal.net  Sat Feb  7 11:10:43 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Sat, 07 Feb 2009 08:10:43 -0800
Subject: Tkinter w.pack()?
In-Reply-To: <mailman.8992.1233938703.3487.python-list@python.org>
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>	<mailman.8272.1233232075.3487.python-list@python.org>	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>	<mailman.8488.1233440963.3487.python-list@python.org>	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>	<mailman.8522.1233496608.3487.python-list@python.org>	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
	<mailman.8992.1233938703.3487.python-list@python.org>
Message-ID: <Jnijl.16292$yr3.5511@nlpi068.nbdc.sbc.com>

MRAB wrote:
> W. eWatson wrote:
...
>> I thought some months ago, I found Google commands that would operate 
>> in the browser link window. Guess not.
>>
>> BTW, isn't there an O'Reilly book on Google hacks of this sort? Where 
>> else does one find out about these Google tools?
>>
> Google? :-)
> 
> http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861
> 
Thanks. I may have that book marked from many, many months ago. If so, I see 
why I'd never find it. The BM entry does not show "Google". It does now. ;-)

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From benjamin at python.org  Sat Feb  7 11:20:08 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 7 Feb 2009 16:20:08 +0000 (UTC)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
Message-ID: <loom.20090207T161853-979@post.gmane.org>

Terry <terry.yinzhe <at> gmail.com> writes:
> On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > Do you by any chance have a few examples of these? There is a lot of
> > idiomatic code in python to e.g. acquire and release the GIL or doing
> > refcount-stuff. If that happens to be done with rather generic names as
> > arguments, I can well imagine that as being the cause.

> Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c

This isn't really fair because Python-ast.c is auto generated. ;)






From zaheer.agadi at gmail.com  Sat Feb  7 11:24:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 7 Feb 2009 08:24:41 -0800 (PST)
Subject: Java to Python
Message-ID: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>

Hi

I have a following class that is written Java and makes use of apache
http client library,I am new to python can any one suggest me a python
equivalent of this following class,

Thanks ,

public class Authenticate{

 private String storageUserName=null;
    private String storagePassword=null;
    private String authorization=null;
    private String identityHostName = null;
    private String identityPortNumber = null;

    private String accessKey=null;
    private String secretKey=null;

    public String getStoragePassword() {
        return storagePassword;
    }

    public void setStoragePassword(String storagePassword) {
        this.storagePassword = storagePassword;
    }

    public String getStorageUserName() {
        return storageUserName;
    }

    public void setStorageUserName(String storageUserName) {
        this.storageUserName = storageUserName;
    }

    public String getIdentityHostName() {
        return identityHostName;
    }

    public void setIdentityHostName(String identityHostName) {
        this.identityHostName = identityHostName;
    }

    public String getIdentityPortNumber() {
        return identityPortNumber;
    }

    public void setIdentityPortNumber(String identityPortNumber) {
        this.identityPortNumber = identityPortNumber;
    }

    public String getAccessKey() {
        return accessKey;
    }

    public void setAccessKey(String accessKey) {
        this.accessKey = accessKey;
    }

    public String getSecretKey() {
        return secretKey;
    }

    public void setSecretKey(String secretKey) {
        this.secretKey = secretKey;
    }


     /**
     * <p>Convenience string for Base 64 encoding.</p>
     */
    private static final String BASE64_CHARS =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
            "abcdefghijklmnopqrstuvwxyz" +
            "0123456789+/";

    /**
     * <p>Encode the specified credentials into a String as required
by
     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
rfc2617.txt">RFC 2617</a>).</p>
     *
     * @param username Username to be encoded
     * @param password Password to be encoded
     * @return String string containing encoded username and password.
     */
    public String encodeCredentialsBasic(String username, String
password) {
        String encode = username + ":" + password;
        int paddingCount = (3 - (encode.length() % 3)) % 3;
        encode += "\0\0".substring(0, paddingCount);
        StringBuilder encoded = new StringBuilder();

        for (int i = 0; i < encode.length(); i += 3) {
        }
        return encoded.toString();
    }

    public void fetchDetails(){
        HttpClient client=new HttpClient();
        //reqDetails = new RequestDetails();
        //String identityURL=MessageUtil.getMessage
("IDENTITY_INSTANCE");
        //int portNumber=Integer.parseInt(MessageUtil.getMessage
("IDENTITY_PORT"));
        authorization="Basic " + encodeCredentialsBasic
(storageUserName, storagePassword);
        String url="https://"+identityHostName+
                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
+"/attributes/";

        Protocol https=null;
        //try {
            https = new Protocol("https", new
EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
        /*} catch (GeneralSecurityException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        }*/
        Protocol.registerProtocol("https", https);
        GetMethod method=new GetMethod(url);
        method.setRequestHeader("Authorization",authorization);
        method.setRequestHeader("Accept","application/xml");
        try {
            int responseCode=client.executeMethod(method);
            if(responseCode==200){
                InputStream is=method.getResponseBodyAsStream();
                BufferedReader bis=new BufferedReader(new
InputStreamReader(is));
                String temp=null,sKey=null, aKey=null;
                String accessKeySearchString="AccessKey</
Name><Value>";
                String secretKeySearchString="SecretKey</
Name><Value>";
                int searchStringLength=0;
                while((temp=bis.readLine())!=null){
                    if(temp.indexOf(accessKeySearchString)!=-1){
                        int beginIndex=temp.indexOf
(accessKeySearchString);
                        searchStringLength=accessKeySearchString.length
();
                        int endIndex=temp.indexOf("</
Value>",beginIndex);
                        aKey=temp.substring(beginIndex
+searchStringLength,endIndex);
                    }
                    if(temp.indexOf(secretKeySearchString)!=-1){
                        int beginIndex=temp.indexOf
(secretKeySearchString);
                        searchStringLength=secretKeySearchString.length
();
                        int endIndex=temp.indexOf("</
Value>",beginIndex);
                        sKey=temp.substring(beginIndex
+searchStringLength,endIndex);
                    }
                }
                setSecretKey(sKey);
                setAccessKey(aKey);
            } else {
                System.out.println("Not able to get the credentials.
Returned : " + responseCode + " response code!!!");
            }
        } catch (IOException ex) {
            Logger.getLogger(Authenticate.class.getName()).log
(Level.SEVERE, null, ex);
        }
    }


From banibrata.dutta at gmail.com  Sat Feb  7 11:27:04 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Sat, 7 Feb 2009 21:57:04 +0530
Subject: Java to Python
In-Reply-To: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
Message-ID: <3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>

Jython is not an option ?

On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:

> Hi
>
> I have a following class that is written Java and makes use of apache
> http client library,I am new to python can any one suggest me a python
> equivalent of this following class,
>
> Thanks ,
>
> public class Authenticate{
>
>  private String storageUserName=null;
>    private String storagePassword=null;
>    private String authorization=null;
>    private String identityHostName = null;
>    private String identityPortNumber = null;
>
>    private String accessKey=null;
>    private String secretKey=null;
>
>    public String getStoragePassword() {
>        return storagePassword;
>    }
>
>    public void setStoragePassword(String storagePassword) {
>        this.storagePassword = storagePassword;
>    }
>
>    public String getStorageUserName() {
>        return storageUserName;
>    }
>
>    public void setStorageUserName(String storageUserName) {
>        this.storageUserName = storageUserName;
>    }
>
>    public String getIdentityHostName() {
>        return identityHostName;
>    }
>
>    public void setIdentityHostName(String identityHostName) {
>        this.identityHostName = identityHostName;
>    }
>
>    public String getIdentityPortNumber() {
>        return identityPortNumber;
>    }
>
>    public void setIdentityPortNumber(String identityPortNumber) {
>        this.identityPortNumber = identityPortNumber;
>    }
>
>    public String getAccessKey() {
>        return accessKey;
>    }
>
>    public void setAccessKey(String accessKey) {
>        this.accessKey = accessKey;
>    }
>
>    public String getSecretKey() {
>        return secretKey;
>    }
>
>    public void setSecretKey(String secretKey) {
>        this.secretKey = secretKey;
>    }
>
>
>     /**
>     * <p>Convenience string for Base 64 encoding.</p>
>     */
>    private static final String BASE64_CHARS =
>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>            "abcdefghijklmnopqrstuvwxyz" +
>            "0123456789+/";
>
>    /**
>     * <p>Encode the specified credentials into a String as required
> by
>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
> rfc2617.txt">RFC 2617</a>).</p>
>     *
>     * @param username Username to be encoded
>     * @param password Password to be encoded
>     * @return String string containing encoded username and password.
>     */
>    public String encodeCredentialsBasic(String username, String
> password) {
>        String encode = username + ":" + password;
>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>        encode += "\0\0".substring(0, paddingCount);
>        StringBuilder encoded = new StringBuilder();
>
>        for (int i = 0; i < encode.length(); i += 3) {
>        }
>        return encoded.toString();
>    }
>
>    public void fetchDetails(){
>        HttpClient client=new HttpClient();
>        //reqDetails = new RequestDetails();
>        //String identityURL=MessageUtil.getMessage
> ("IDENTITY_INSTANCE");
>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
> ("IDENTITY_PORT"));
>        authorization="Basic " + encodeCredentialsBasic
> (storageUserName, storagePassword);
>        String url="https://"+identityHostName+
>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
> +"/attributes/";
>
>        Protocol https=null;
>        //try {
>            https = new Protocol("https", new
> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>        /*} catch (GeneralSecurityException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        } catch (IOException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        }*/
>        Protocol.registerProtocol("https", https);
>        GetMethod method=new GetMethod(url);
>        method.setRequestHeader("Authorization",authorization);
>        method.setRequestHeader("Accept","application/xml");
>        try {
>            int responseCode=client.executeMethod(method);
>            if(responseCode==200){
>                InputStream is=method.getResponseBodyAsStream();
>                BufferedReader bis=new BufferedReader(new
> InputStreamReader(is));
>                String temp=null,sKey=null, aKey=null;
>                String accessKeySearchString="AccessKey</
> Name><Value>";
>                String secretKeySearchString="SecretKey</
> Name><Value>";
>                int searchStringLength=0;
>                while((temp=bis.readLine())!=null){
>                    if(temp.indexOf(accessKeySearchString)!=-1){
>                        int beginIndex=temp.indexOf
> (accessKeySearchString);
>                        searchStringLength=accessKeySearchString.length
> ();
>                        int endIndex=temp.indexOf("</
> Value>",beginIndex);
>                        aKey=temp.substring(beginIndex
> +searchStringLength,endIndex);
>                    }
>                    if(temp.indexOf(secretKeySearchString)!=-1){
>                        int beginIndex=temp.indexOf
> (secretKeySearchString);
>                        searchStringLength=secretKeySearchString.length
> ();
>                        int endIndex=temp.indexOf("</
> Value>",beginIndex);
>                        sKey=temp.substring(beginIndex
> +searchStringLength,endIndex);
>                    }
>                }
>                setSecretKey(sKey);
>                setAccessKey(aKey);
>            } else {
>                System.out.println("Not able to get the credentials.
> Returned : " + responseCode + " response code!!!");
>            }
>        } catch (IOException ex) {
>            Logger.getLogger(Authenticate.class.getName()).log
> (Level.SEVERE, null, ex);
>        }
>    }
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From zaheer.agadi at gmail.com  Sat Feb  7 11:49:48 2009
From: zaheer.agadi at gmail.com (zaheer agadi)
Date: Sat, 7 Feb 2009 22:19:48 +0530
Subject: Java to Python
In-Reply-To: <3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
Message-ID: <397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>

Hi Thanks for replying ..
I am actually looking for the pure Python options

Are there any equivalent clasees  for the following

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import
org.apache.commons.httpclient.contrib.ssl.EasySSLProtocolSocketFactory;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.protocol.Protocol;


Thanks for your help
-Zaheer

On Sat, Feb 7, 2009 at 9:57 PM, Banibrata Dutta
<banibrata.dutta at gmail.com>wrote:

> Jython is not an option ?
>
> On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:
>
>> Hi
>>
>> I have a following class that is written Java and makes use of apache
>> http client library,I am new to python can any one suggest me a python
>> equivalent of this following class,
>>
>> Thanks ,
>>
>> public class Authenticate{
>>
>>  private String storageUserName=null;
>>    private String storagePassword=null;
>>    private String authorization=null;
>>    private String identityHostName = null;
>>    private String identityPortNumber = null;
>>
>>    private String accessKey=null;
>>    private String secretKey=null;
>>
>>    public String getStoragePassword() {
>>        return storagePassword;
>>    }
>>
>>    public void setStoragePassword(String storagePassword) {
>>        this.storagePassword = storagePassword;
>>    }
>>
>>    public String getStorageUserName() {
>>        return storageUserName;
>>    }
>>
>>    public void setStorageUserName(String storageUserName) {
>>        this.storageUserName = storageUserName;
>>    }
>>
>>    public String getIdentityHostName() {
>>        return identityHostName;
>>    }
>>
>>    public void setIdentityHostName(String identityHostName) {
>>        this.identityHostName = identityHostName;
>>    }
>>
>>    public String getIdentityPortNumber() {
>>        return identityPortNumber;
>>    }
>>
>>    public void setIdentityPortNumber(String identityPortNumber) {
>>        this.identityPortNumber = identityPortNumber;
>>    }
>>
>>    public String getAccessKey() {
>>        return accessKey;
>>    }
>>
>>    public void setAccessKey(String accessKey) {
>>        this.accessKey = accessKey;
>>    }
>>
>>    public String getSecretKey() {
>>        return secretKey;
>>    }
>>
>>    public void setSecretKey(String secretKey) {
>>        this.secretKey = secretKey;
>>    }
>>
>>
>>     /**
>>     * <p>Convenience string for Base 64 encoding.</p>
>>     */
>>    private static final String BASE64_CHARS =
>>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>>            "abcdefghijklmnopqrstuvwxyz" +
>>            "0123456789+/";
>>
>>    /**
>>     * <p>Encode the specified credentials into a String as required
>> by
>>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
>> rfc2617.txt <http://www.ietf.org/rfc/%0Arfc2617.txt>">RFC 2617</a>).</p>
>>     *
>>     * @param username Username to be encoded
>>     * @param password Password to be encoded
>>     * @return String string containing encoded username and password.
>>     */
>>    public String encodeCredentialsBasic(String username, String
>> password) {
>>        String encode = username + ":" + password;
>>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>>        encode += "\0\0".substring(0, paddingCount);
>>        StringBuilder encoded = new StringBuilder();
>>
>>        for (int i = 0; i < encode.length(); i += 3) {
>>        }
>>        return encoded.toString();
>>    }
>>
>>    public void fetchDetails(){
>>        HttpClient client=new HttpClient();
>>        //reqDetails = new RequestDetails();
>>        //String identityURL=MessageUtil.getMessage
>> ("IDENTITY_INSTANCE");
>>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
>> ("IDENTITY_PORT"));
>>        authorization="Basic " + encodeCredentialsBasic
>> (storageUserName, storagePassword);
>>        String url="https://"+identityHostName+
>>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
>> +"/attributes/";
>>
>>        Protocol https=null;
>>        //try {
>>            https = new Protocol("https", new
>> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>>        /*} catch (GeneralSecurityException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        } catch (IOException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        }*/
>>        Protocol.registerProtocol("https", https);
>>        GetMethod method=new GetMethod(url);
>>        method.setRequestHeader("Authorization",authorization);
>>        method.setRequestHeader("Accept","application/xml");
>>        try {
>>            int responseCode=client.executeMethod(method);
>>            if(responseCode==200){
>>                InputStream is=method.getResponseBodyAsStream();
>>                BufferedReader bis=new BufferedReader(new
>> InputStreamReader(is));
>>                String temp=null,sKey=null, aKey=null;
>>                String accessKeySearchString="AccessKey</
>> Name><Value>";
>>                String secretKeySearchString="SecretKey</
>> Name><Value>";
>>                int searchStringLength=0;
>>                while((temp=bis.readLine())!=null){
>>                    if(temp.indexOf(accessKeySearchString)!=-1){
>>                        int beginIndex=temp.indexOf
>> (accessKeySearchString);
>>                        searchStringLength=accessKeySearchString.length
>> ();
>>                        int endIndex=temp.indexOf("</
>> Value>",beginIndex);
>>                        aKey=temp.substring(beginIndex
>> +searchStringLength,endIndex);
>>                    }
>>                    if(temp.indexOf(secretKeySearchString)!=-1){
>>                        int beginIndex=temp.indexOf
>> (secretKeySearchString);
>>                        searchStringLength=secretKeySearchString.length
>> ();
>>                        int endIndex=temp.indexOf("</
>> Value>",beginIndex);
>>                        sKey=temp.substring(beginIndex
>> +searchStringLength,endIndex);
>>                    }
>>                }
>>                setSecretKey(sKey);
>>                setAccessKey(aKey);
>>            } else {
>>                System.out.println("Not able to get the credentials.
>> Returned : " + responseCode + " response code!!!");
>>            }
>>        } catch (IOException ex) {
>>            Logger.getLogger(Authenticate.class.getName()).log
>> (Level.SEVERE, null, ex);
>>        }
>>    }
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> regards,
> Banibrata
> http://www.linkedin.com/in/bdutta
>
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From alex at a13x.net  Sat Feb  7 12:09:42 2009
From: alex at a13x.net (Aleksandar Radulovic)
Date: Sat, 7 Feb 2009 17:09:42 +0000
Subject: Java to Python
In-Reply-To: <397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
	<397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
Message-ID: <845b10c50902070909r646b16a2rddc6e0e19c2df4d1@mail.gmail.com>

Hi,

This looks like a perfect job for httplib and urllib2 modules.

On Sat, Feb 7, 2009 at 4:49 PM, zaheer agadi <zaheer.agadi at gmail.com> wrote:
> Hi Thanks for replying ..
> I am actually looking for the pure Python options
>
> Are there any equivalent clasees  for the following
>
> import org.apache.commons.httpclient.HttpClient;
> import org.apache.commons.httpclient.HttpException;
> import
> org.apache.commons.httpclient.contrib.ssl.EasySSLProtocolSocketFactory;
> import org.apache.commons.httpclient.methods.GetMethod;
> import org.apache.commons.httpclient.protocol.Protocol;
>
>
> Thanks for your help
> -Zaheer
>
> On Sat, Feb 7, 2009 at 9:57 PM, Banibrata Dutta <banibrata.dutta at gmail.com>
> wrote:
>>
>> Jython is not an option ?
>>
>> On Sat, Feb 7, 2009 at 9:54 PM, <zaheer.agadi at gmail.com> wrote:
>>>
>>> Hi
>>>
>>> I have a following class that is written Java and makes use of apache
>>> http client library,I am new to python can any one suggest me a python
>>> equivalent of this following class,
>>>
>>> Thanks ,
>>>
>>> public class Authenticate{
>>>
>>>  private String storageUserName=null;
>>>    private String storagePassword=null;
>>>    private String authorization=null;
>>>    private String identityHostName = null;
>>>    private String identityPortNumber = null;
>>>
>>>    private String accessKey=null;
>>>    private String secretKey=null;
>>>
>>>    public String getStoragePassword() {
>>>        return storagePassword;
>>>    }
>>>
>>>    public void setStoragePassword(String storagePassword) {
>>>        this.storagePassword = storagePassword;
>>>    }
>>>
>>>    public String getStorageUserName() {
>>>        return storageUserName;
>>>    }
>>>
>>>    public void setStorageUserName(String storageUserName) {
>>>        this.storageUserName = storageUserName;
>>>    }
>>>
>>>    public String getIdentityHostName() {
>>>        return identityHostName;
>>>    }
>>>
>>>    public void setIdentityHostName(String identityHostName) {
>>>        this.identityHostName = identityHostName;
>>>    }
>>>
>>>    public String getIdentityPortNumber() {
>>>        return identityPortNumber;
>>>    }
>>>
>>>    public void setIdentityPortNumber(String identityPortNumber) {
>>>        this.identityPortNumber = identityPortNumber;
>>>    }
>>>
>>>    public String getAccessKey() {
>>>        return accessKey;
>>>    }
>>>
>>>    public void setAccessKey(String accessKey) {
>>>        this.accessKey = accessKey;
>>>    }
>>>
>>>    public String getSecretKey() {
>>>        return secretKey;
>>>    }
>>>
>>>    public void setSecretKey(String secretKey) {
>>>        this.secretKey = secretKey;
>>>    }
>>>
>>>
>>>     /**
>>>     * <p>Convenience string for Base 64 encoding.</p>
>>>     */
>>>    private static final String BASE64_CHARS =
>>>            "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
>>>            "abcdefghijklmnopqrstuvwxyz" +
>>>            "0123456789+/";
>>>
>>>    /**
>>>     * <p>Encode the specified credentials into a String as required
>>> by
>>>     * HTTP Basic Authentication (<a href="http://www.ietf.org/rfc/
>>> rfc2617.txt">RFC 2617</a>).</p>
>>>     *
>>>     * @param username Username to be encoded
>>>     * @param password Password to be encoded
>>>     * @return String string containing encoded username and password.
>>>     */
>>>    public String encodeCredentialsBasic(String username, String
>>> password) {
>>>        String encode = username + ":" + password;
>>>        int paddingCount = (3 - (encode.length() % 3)) % 3;
>>>        encode += "\0\0".substring(0, paddingCount);
>>>        StringBuilder encoded = new StringBuilder();
>>>
>>>        for (int i = 0; i < encode.length(); i += 3) {
>>>        }
>>>        return encoded.toString();
>>>    }
>>>
>>>    public void fetchDetails(){
>>>        HttpClient client=new HttpClient();
>>>        //reqDetails = new RequestDetails();
>>>        //String identityURL=MessageUtil.getMessage
>>> ("IDENTITY_INSTANCE");
>>>        //int portNumber=Integer.parseInt(MessageUtil.getMessage
>>> ("IDENTITY_PORT"));
>>>        authorization="Basic " + encodeCredentialsBasic
>>> (storageUserName, storagePassword);
>>>        String url="https://"+identityHostName+
>>>                ":"+identityPortNumber+"/test/ndcsd2/persons/"+UserName
>>> +"/attributes/";
>>>
>>>        Protocol https=null;
>>>        //try {
>>>            https = new Protocol("https", new
>>> EasySSLProtocolSocketFactory(), Integer.parseInt(identityPortNumber));
>>>        /*} catch (GeneralSecurityException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        } catch (IOException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        }*/
>>>        Protocol.registerProtocol("https", https);
>>>        GetMethod method=new GetMethod(url);
>>>        method.setRequestHeader("Authorization",authorization);
>>>        method.setRequestHeader("Accept","application/xml");
>>>        try {
>>>            int responseCode=client.executeMethod(method);
>>>            if(responseCode==200){
>>>                InputStream is=method.getResponseBodyAsStream();
>>>                BufferedReader bis=new BufferedReader(new
>>> InputStreamReader(is));
>>>                String temp=null,sKey=null, aKey=null;
>>>                String accessKeySearchString="AccessKey</
>>> Name><Value>";
>>>                String secretKeySearchString="SecretKey</
>>> Name><Value>";
>>>                int searchStringLength=0;
>>>                while((temp=bis.readLine())!=null){
>>>                    if(temp.indexOf(accessKeySearchString)!=-1){
>>>                        int beginIndex=temp.indexOf
>>> (accessKeySearchString);
>>>                        searchStringLength=accessKeySearchString.length
>>> ();
>>>                        int endIndex=temp.indexOf("</
>>> Value>",beginIndex);
>>>                        aKey=temp.substring(beginIndex
>>> +searchStringLength,endIndex);
>>>                    }
>>>                    if(temp.indexOf(secretKeySearchString)!=-1){
>>>                        int beginIndex=temp.indexOf
>>> (secretKeySearchString);
>>>                        searchStringLength=secretKeySearchString.length
>>> ();
>>>                        int endIndex=temp.indexOf("</
>>> Value>",beginIndex);
>>>                        sKey=temp.substring(beginIndex
>>> +searchStringLength,endIndex);
>>>                    }
>>>                }
>>>                setSecretKey(sKey);
>>>                setAccessKey(aKey);
>>>            } else {
>>>                System.out.println("Not able to get the credentials.
>>> Returned : " + responseCode + " response code!!!");
>>>            }
>>>        } catch (IOException ex) {
>>>            Logger.getLogger(Authenticate.class.getName()).log
>>> (Level.SEVERE, null, ex);
>>>        }
>>>    }
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>
>> --
>> regards,
>> Banibrata
>> http://www.linkedin.com/in/bdutta
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



-- 
a lex 13 x
http://www.a13x.info


From rdmurray at bitdance.com  Sat Feb  7 12:12:01 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 17:12:01 +0000 (UTC)
Subject: isfifo?
Message-ID: <gmkfd1$gbu$1@ger.gmane.org>

I've googled and looked through os.path, but I don't see a method for
determining if a path points to a FIFO.  Anyone know of a simple way to
do so?

--RDM



From marduk at letterboxes.org  Sat Feb  7 12:23:20 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sat, 07 Feb 2009 12:23:20 -0500
Subject: isfifo?
In-Reply-To: <gmkfd1$gbu$1@ger.gmane.org>
References: <gmkfd1$gbu$1@ger.gmane.org>
Message-ID: <1234027400.12522.2.camel@centar.nbk>

On Sat, 2009-02-07 at 17:12 +0000, rdmurray at bitdance.com wrote:
> I've googled and looked through os.path, but I don't see a method for
> determining if a path points to a FIFO.  Anyone know of a simple way to
> do so?

import os
import stat

st_mode = os.stat(path)[0]
isfifo = stat.S_ISFIFO(st_mode)




From Scott.Daniels at Acm.Org  Sat Feb  7 12:26:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 07 Feb 2009 09:26:40 -0800
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
Message-ID: <waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>

Terry wrote:
> ... I'm not saying that you can not have duplication in code. But it
> seems that the stable & successful software releases tend to have
> relatively stable duplication rate.

This analysis overlooks the fact that 3.0 _was_ a major change, and is
likely to grow cut-and-paste solutions to some problems as we switch to
Unicode strings from byte strings.  You are comparing a .0 version to
.5 versions.  I expect the polishing that follows as we go up through
.1, .2, and so on will lower those redundancy measures.

--Scott David Daniels
Scott.Daniels at Acm.Org


From martin at v.loewis.de  Sat Feb  7 12:28:15 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 18:28:15 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
Message-ID: <498dc4af$0$7112$9b622d9e@news.freenet.de>

> And I'm not saying that you can not have duplication in code. But it
> seems that the stable & successful software releases tend to have
> relatively stable duplication rate.

So if some software has an instable duplication rate, it probably
means that it is either not stable, or not successful.

In the case of Python 3.0, it's fairly obvious which one it is:
it's not stable. Indeed, Python 3.0 is a significant change from
Python 2.x. Of course, anybody following the Python 3 development
process could have told you see even without any code metrics.

I still find the raw numbers fairly useless. What matters more to
me is what specific code duplications have been added. Furthermore,
your Dup30 classification is not important to me, but I'm rather
after the nearly 2000 new chunks of code that has more than 60
subsequent tokens duplicated.

Regards,
Martin


From martin at v.loewis.de  Sat Feb  7 12:30:21 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 18:30:21 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
Message-ID: <498dc52d$0$7112$9b622d9e@news.freenet.de>

> But the duplication are always not very big, from about 100 lines
> (rare) to less the 5 lines. As you can see the Rate30 is much bigger
> than Rate60, that means there are a lot of small duplications.

I don't find that important for code quality. It's the large chunks
that I would like to see de-duplicated (unless, of course, they are
in generated code, in which case I couldn't care less).

Unfortunately, none of the examples you have posted so far are
- large chunks, and
- new in 3.0.

Regards,
Martin


From martin at v.loewis.de  Sat Feb  7 12:35:02 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 18:35:02 +0100
Subject: isfifo?
In-Reply-To: <mailman.9056.1234026740.3487.python-list@python.org>
References: <mailman.9056.1234026740.3487.python-list@python.org>
Message-ID: <498dc646$0$7112$9b622d9e@news.freenet.de>

rdmurray at bitdance.com wrote:
> I've googled and looked through os.path, but I don't see a method for
> determining if a path points to a FIFO.  Anyone know of a simple way to
> do so?

def isfifo(fn):
  return stat.S_ISFIFO(os.stat(fn).st_mode)

HTH,
Martin


From rdmurray at bitdance.com  Sat Feb  7 13:28:50 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 7 Feb 2009 18:28:50 +0000 (UTC)
Subject: isfifo?
References: <mailman.9056.1234026740.3487.python-list@python.org>
	<498dc646$0$7112$9b622d9e@news.freenet.de>
Message-ID: <gmkjt2$2hs$1@ger.gmane.org>

=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?= <martin at v.loewis.de> wrote:
> rdmurray at bitdance.com wrote:
> > I've googled and looked through os.path, but I don't see a method for
> > determining if a path points to a FIFO.  Anyone know of a simple way to
> > do so?
> 
> def isfifo(fn):
>   return stat.S_ISFIFO(os.stat(fn).st_mode)

Thanks.  I should have thought of looking in os.stat.  Odd that S_ISFIFO
didn't come up in my google search.

--RDM



From bdesth.quelquechose at free.quelquepart.fr  Sat Feb  7 14:06:20 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Sat, 07 Feb 2009 20:06:20 +0100
Subject: WebError documentation?
In-Reply-To: <rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
	<rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
Message-ID: <498de947$0$24412$426a74cc@news.free.fr>

Ron Garret a ?crit :
> In article <mailman.9037.1233981452.3487.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
>>> Is there any?  Where is it?  Extensive Googling has proven fruitless.
>> It's not a standard Python exception. A third-party library you're
>> using must be raising it. Check the exception traceback.
> 
> I see I did not make myself clear.

Now *that* is an understatement...

 >  I meant the Python software package
> called "weberror", not a generic web error.
> 
> http://pypi.python.org/pypi/WebError

Google is your friend:
http://bel-epa.com/docs/thirdparty/weberror/


From asmodai at in-nomine.org  Sat Feb  7 14:48:34 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Sat, 7 Feb 2009 20:48:34 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
Message-ID: <20090207194834.GP14658@nexus.in-nomine.org>

-On [20090207 18:25], Scott David Daniels (Scott.Daniels at Acm.Org) wrote:
>This analysis overlooks the fact that 3.0 _was_ a major change, and is
>likely to grow cut-and-paste solutions to some problems as we switch to
>Unicode strings from byte strings.

You'd best hope the copied section was thoroughly reviewed otherwise you're
duplicating a flaw across X other sections. And then you also best hope that
whoever finds said flaw and fixes it is also smart enough to check for
similar constructs around the code base.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From alex at a13x.net  Sat Feb  7 15:02:07 2009
From: alex at a13x.net (Aleksandar Radulovic)
Date: Sat, 7 Feb 2009 20:02:07 +0000
Subject: Java to Python
In-Reply-To: <397dfed40902070928k5d8fa7f5tc7ff0efe2d44599a@mail.gmail.com>
References: <47cc94b7-afbe-4224-97d1-b268336d92a5@e1g2000pra.googlegroups.com>
	<3de8e1f70902070827s3faefa54y68ddad20d3178297@mail.gmail.com>
	<397dfed40902070849k723d3594yb1c6a9c012383027@mail.gmail.com>
	<845b10c50902070909h111ac623u565ec1d1c5d9ad52@mail.gmail.com>
	<397dfed40902070928k5d8fa7f5tc7ff0efe2d44599a@mail.gmail.com>
Message-ID: <845b10c50902071202p78aad1fao93c1d6a3148b589a@mail.gmail.com>

Hi,

On Sat, Feb 7, 2009 at 5:28 PM, zaheer agadi <zaheer.agadi at gmail.com> wrote:
> Thanks Alex,
>
>  Can you provide me more details on httplib and urllib ?

The details can be found in Python documentation (http://python.org/doc),
on these pages:
http://docs.python.org/library/httplib.html

I'm sure you can figure out the location of the documentation for the urllib2
module. Documentation includes examples too.


Regards,
alex.
-- 
a lex 13 x
http://www.a13x.info


From steve at holdenweb.com  Sat Feb  7 15:06:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 07 Feb 2009 15:06:12 -0500
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <20090207194834.GP14658@nexus.in-nomine.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
Message-ID: <gmkpjn$hsp$1@ger.gmane.org>

Jeroen Ruigrok van der Werven wrote:
> -On [20090207 18:25], Scott David Daniels (Scott.Daniels at Acm.Org) wrote:
>> This analysis overlooks the fact that 3.0 _was_ a major change, and is
>> likely to grow cut-and-paste solutions to some problems as we switch to
>> Unicode strings from byte strings.
> 
> You'd best hope the copied section was thoroughly reviewed otherwise you're
> duplicating a flaw across X other sections. And then you also best hope that
> whoever finds said flaw and fixes it is also smart enough to check for
> similar constructs around the code base.
> 
This is probably preferable to five different developers solving the
same problem five different ways and introducing three *different* bugs, no?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From theller at python.net  Sat Feb  7 15:37:14 2009
From: theller at python.net (Thomas Heller)
Date: Sat, 07 Feb 2009 21:37:14 +0100
Subject: py2exe and distutils
In-Reply-To: <gmk5o8$g34$00$1@news.t-online.com>
References: <gmk5o8$g34$00$1@news.t-online.com>
Message-ID: <6v69nnFi8bmqU1@mid.individual.net>

Maxim Demenko schrieb:
> Hi,
> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
> Now i can't list installed modules, here is the stacktrace:
> 
> 
> 
> help> modules
> 
> Please wait a moment while I gather a list of all available modules...
> 
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>    File "C:\Programme\Python25\lib\site.py", line 346, in __call__
>      return pydoc.help(*args, **kwds)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1649, in __call__
>      self.interact()
>    File "C:\Programme\Python25\lib\pydoc.py", line 1667, in interact
>      self.help(request)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1683, in help
>      elif request == 'modules': self.listmodules()
>    File "C:\Programme\Python25\lib\pydoc.py", line 1804, in listmodules
>      ModuleScanner().run(callback)
>    File "C:\Programme\Python25\lib\pydoc.py", line 1855, in run
>      for importer, modname, ispkg in pkgutil.walk_packages():
>    File "C:\Programme\Python25\lib\pkgutil.py", line 110, in walk_packages
>      __import__(name)
>    File 
> "C:\Programme\Python25\Lib\site-packages\setuptools\__init__.py", line 
> 2, in <module>
>      from setuptools.extension import Extension, Library
>    File 
> "C:\Programme\Python25\Lib\site-packages\setuptools\extension.py", line 
> 2, in <module>
>      from dist import _get_unpatched
>    File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
> line 27, in <module>
>      _Distribution = _get_unpatched(_Distribution)
>    File "C:\Programme\Python25\Lib\site-packages\setuptools\dist.py", 
> line 23, in _get_unpatched
>      "distutils has already been patched by %r" % cls
> AssertionError: distutils has already been patched by <class 
> py2exe.Distribution at 0x011B4F90>
> 
> Any suggestion, how to fix this issue?

Looks like a setuptools problem to me.  Here's the output on my system:

>>> help("modules")

Please wait a moment while I gather a list of all available modules...

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "c:\python25\lib\site.py", line 346, in __call__
    return pydoc.help(*args, **kwds)
  File "c:\python25\lib\pydoc.py", line 1645, in __call__
    self.help(request)
  File "c:\python25\lib\pydoc.py", line 1682, in help
    elif request == 'modules': self.listmodules()
  File "c:\python25\lib\pydoc.py", line 1803, in listmodules
    ModuleScanner().run(callback)
  File "c:\python25\lib\pydoc.py", line 1854, in run
    for importer, modname, ispkg in pkgutil.walk_packages():
  File "c:\python25\lib\pkgutil.py", line 125, in walk_packages
    for item in walk_packages(path, name+'.', onerror):
  File "c:\python25\lib\pkgutil.py", line 110, in walk_packages
    __import__(name)
  File "c:\python25\lib\site-packages\pyopengl-3.0.0b1-py2.5.egg\OpenGL\Tk\__init__.py", line 87, in <module>
    _default_root.tk.call('package', 'require', 'Togl')
_tkinter.TclError: can't find package Togl
>>> ^Z

Thomas


From mmanns at gmx.net  Sat Feb  7 15:39:17 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Sat, 7 Feb 2009 21:39:17 +0100
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
Message-ID: <20090207213917.24c8433a@gmx.net>

On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
Rhamphoryncus <rhamph at gmail.com> wrote:

> On Feb 6, 10:21?pm, rdmur... at bitdance.com wrote:
> > Quoth Mensanator <mensana... at aol.com>:
> > > def flatten(listOfLists):
> > > ? ? return list(chain.from_iterable(listOfLists))
> >
> > ? ? Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> > ? ? [GCC 4.3.2] on linux2
> > ? ? Type "help", "copyright", "credits" or "license" for more
> > information. >>> from itertools import chain
> > ? ? >>> list(chain.from_iterable([1, 2, [3, 4]]))
> > ? ? Traceback (most recent call last):
> > ? ? ? File "<stdin>", line 1, in <module>
> > ? ? TypeError: 'int' object is not iterable
> > ? ? >>> list(chain(*[1, 2, [3, 4]]))
> > ? ? Traceback (most recent call last):
> > ? ? ? File "<stdin>", line 1, in <module>
> > ? ? TypeError: 'int' object is not iterable
> > ? ? >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]]))
> > ? ? ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4]
> 
> What usecase do you have for such inconsistently structured data?

I have a similar use case in pyspread, which is a Python spreadsheet
that employs numpy object arrays. Since the Python objects in the numpy
arrays are derived from user input, they can be anything, including
nested lists as well as strings, etc.

Since I consider my work-around that treats strings as a special case a
rather ugly hack, I would welcome a robust, generic approach to the
OP's problem.

Martin



From theller at python.net  Sat Feb  7 15:39:19 2009
From: theller at python.net (Thomas Heller)
Date: Sat, 07 Feb 2009 21:39:19 +0100
Subject: py2exe and distutils
In-Reply-To: <6v69nnFi8bmqU1@mid.individual.net>
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net>
Message-ID: <6v69rkFi8bmqU2@mid.individual.net>

> Maxim Demenko schrieb:
>> Hi,
>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
>> Now i can't list installed modules, here is the stacktrace:
[...]
>> Any suggestion, how to fix this issue?
> 
Thomas Heller schrieb:
> Looks like a setuptools problem to me.  Here's the output on my system:

Actually, I don't know where the problem is.  Maybe pydoc?

> 
> Thomas


From sjmachin at lexicon.net  Sat Feb  7 15:40:09 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 12:40:09 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
	<mailman.9049.1234017453.3487.python-list@python.org>
Message-ID: <c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>

On Feb 8, 1:37?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> LaundroMat wrote:
> > Hi,
>
> > I'm quite new to regular expressions, and I wonder if anyone here
> > could help me out.
>
> > I'm looking to split strings that ideally look like this: "Update: New
> > item (Household)" into a group.
> > This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> > ("Update", "New item", "(Household)")
>
> > Some strings will look like this however: "Update: New item (item)
> > (Household)". The expression above still does its job, as it returns
> > ("Update", "New item (item)", "(Household)").

Not quite true; it actually returns
    ('Update:', ' New item (item) ', '(Household)')
However ignoring the difference in whitespace, the OP's intention is
clear. Yours returns
    ('Update:', ' New item ', '(item) (Household)')


> > It does not work however when there is no text in parentheses (eg
> > "Update: new item"). How can I get the expression to return a tuple
> > such as ("Update:", "new item", None)?
>
> You need to make the last group optional and also make the middle group
> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.

Why do you perpetuate the redundant ^ anchor?

> (?:...) is the non-capturing version of (...).

Why do you use
    (?:(subpattern))?
instead of just plain
    (subpattern)?
?



From rhamph at gmail.com  Sat Feb  7 15:50:22 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sat, 7 Feb 2009 12:50:22 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
Message-ID: <afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>

On Feb 7, 1:39?pm, <mma... at gmx.net> wrote:
> On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
> Rhamphoryncus <rha... at gmail.com> wrote:
>
> > What usecase do you have for such inconsistently structured data?
>
> I have a similar use case in pyspread, which is a Python spreadsheet
> that employs numpy object arrays. Since the Python objects in the numpy
> arrays are derived from user input, they can be anything, including
> nested lists as well as strings, etc.
>
> Since I consider my work-around that treats strings as a special case a
> rather ugly hack, I would welcome a robust, generic approach to the
> OP's problem.

Can you explain this in a little more detail?


From aleksandr.goretoy at gmail.com  Sat Feb  7 15:51:58 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Sat, 7 Feb 2009 14:51:58 -0600
Subject: Where to host a (Python) project?
In-Reply-To: <fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>
References: <387f23cd-90e2-46fc-8c91-1c2f6b31c89e@u13g2000yqg.googlegroups.com>
	<gm5c66$1ve$1@panix3.panix.com>
	<6dcb8ce5-c93e-458c-9047-e5db60f27d90@v18g2000pro.googlegroups.com>
	<gmfsli$dgd$1@panix3.panix.com> <87bptgxu2y.fsf@benfinney.id.au>
	<fa98a9e30902052307o6f90a990k87cc823a377a605f@mail.gmail.com>
Message-ID: <fa98a9e30902071251g7aea9b19l4ab0d434f154d4ee@mail.gmail.com>

If you don't mind changing dns entries. You can also use Google App Engine.
It's really nice.

http://code.google.com/appengine/docs/python/tools/webapp/overview.html

-Alex Goretoy
http://www.alexgoretoy.com



On Fri, Feb 6, 2009 at 1:07 AM, alex goretoy <aleksandr.goretoy at gmail.com>wrote:

> I use google code.
> http://code.google.com/p/pynutbutter
>
> -Alex Goretoy
> http://www.alexgoretoy.com
>
>
>
>
> On Thu, Feb 5, 2009 at 6:55 PM, Ben Finney <
> bignose+hates-spam at benfinney.id.au <bignose%2Bhates-spam at benfinney.id.au>>wrote:
>
>> aahz at pythoncraft.com (Aahz) writes:
>>
>> > In article <
>> 6dcb8ce5-c93e-458c-9047-e5db60f27d90 at v18g2000pro.googlegroups.com>,
>> > andrew cooke  <andrew at acooke.org> wrote:
>> > >hi, just fyi, i investigated this and you can join any publicly
>> > >readable group by sending an email to the "-subscribe" address. you
>> > >do not need a google login for this and, as far as i can tell, it
>> > >then operates for you like a normal mailing list.
>> >
>> > The same thing is theoretically true for Yahoo groups, but I've
>> > heard from people over the years about various difficulties fixing
>> > problems with list subscriptions in the absence of a real Yahoo
>> > login and I'm not particularly interested in finding out that the
>> > same thing ends up being true for Google lists.
>>
>> Indeed it does. I have succeeded in subscribing to Google mailing
>> lists in the absence of a Google account, but *managing* that
>> subscription thereafter in the absence of a Google account is
>> obnoxiously difficult. Your caution is well advised.
>>
>> --
>>  \                "I got fired from my job the other day. They said my |
>>  `\          personality was weird. ? That's okay, I have four more." |
>> _o__)                                       ?Bug-Eyed Earl, _Red Meat_ |
>> Ben Finney
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From martin at v.loewis.de  Sat Feb  7 15:52:47 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 07 Feb 2009 21:52:47 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <mailman.9062.1234037192.3487.python-list@python.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>	<20090207194834.GP14658@nexus.in-nomine.org>
	<mailman.9062.1234037192.3487.python-list@python.org>
Message-ID: <498df49f$0$11402$9b622d9e@news.freenet.de>

> This is probably preferable to five different developers solving the
> same problem five different ways and introducing three *different* bugs, no?

With the examples presented, I'm not convinced that there is actually
significant code duplication going on in the first place.

Regards,
Martin


From mdemenko at gmail.com  Sat Feb  7 16:20:01 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Sat, 07 Feb 2009 22:20:01 +0100
Subject: py2exe and distutils
In-Reply-To: <6v69rkFi8bmqU2@mid.individual.net>
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
Message-ID: <498DFB01.5060308@gmail.com>

Thomas Heller schrieb:
>> Maxim Demenko schrieb:
>>> Hi,
>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 0.6.9
>>> Now i can't list installed modules, here is the stacktrace:
> [...]
>>> Any suggestion, how to fix this issue?
> Thomas Heller schrieb:
>> Looks like a setuptools problem to me.  Here's the output on my system:
> 
> Actually, I don't know where the problem is.  Maybe pydoc?
> 
>> Thomas

Thank you Thomas,
i found http://thread.gmane.org/gmane.comp.python.distutils.devel/3340
and tried to import setuptools first - indeed, in this case the problem 
seems to be solved, however, would like to know, how to persist it.
If i put it into py2exe.__init__.py - is it a very bad idea?

Best regards

Maxim


From asmodai at in-nomine.org  Sat Feb  7 16:25:14 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Sat, 7 Feb 2009 22:25:14 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <gmkpjn$hsp$1@ger.gmane.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
	<gmkpjn$hsp$1@ger.gmane.org>
Message-ID: <20090207212514.GB58127@nexus.in-nomine.org>

-On [20090207 21:07], Steve Holden (steve at holdenweb.com) wrote:
>This is probably preferable to five different developers solving the
>same problem five different ways and introducing three *different* bugs, no?

I guess the answer would be 'that depends', but in most cases you would be
correct, yes.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From mmanns at gmx.net  Sat Feb  7 17:07:19 2009
From: mmanns at gmx.net (mmanns at gmx.net)
Date: Sat, 7 Feb 2009 23:07:19 +0100
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org>
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com>
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com>
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com>
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
	<afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>
Message-ID: <20090207230719.5bfd6022@gmx.net>

On Sat, 7 Feb 2009 12:50:22 -0800 (PST)
Rhamphoryncus <rhamph at gmail.com> wrote:

> On Feb 7, 1:39?pm, <mma... at gmx.net> wrote:
> > On Sat, 7 Feb 2009 01:06:06 -0800 (PST)
> > Rhamphoryncus <rha... at gmail.com> wrote:
> >
> > > What usecase do you have for such inconsistently structured data?
> >
> > I have a similar use case in pyspread, which is a Python spreadsheet
> > that employs numpy object arrays. Since the Python objects in the
> > numpy arrays are derived from user input, they can be anything,
> > including nested lists as well as strings, etc.
> >
> > Since I consider my work-around that treats strings as a special
> > case a rather ugly hack, I would welcome a robust, generic approach
> > to the OP's problem.
> 
> Can you explain this in a little more detail?

In the application, there is one main numpy array of type "O".
Each element of the array corresponds to one cell in a grid. The user
may enter a Python expression into the grid cell. The input is
evaled and the result is stored in the numpy array (the actual process
is a bit more complicated). Therefore, the object inside a numpy array
element may be an inconsistent, nested, iterable type.

The user now may access the result grid via __getitem__. When doing
this, a numpy array that is as flat as possible while comprising the
maximum possible data depth is returned, i.e.:

1. Non-string and non-unicode iterables of similar length for each of
the cells form extra dimensions.

2. In order to remove different container types, the result is
flattened, cast into a numpy.array and re-shaped.

3. Dimensions of length 1 are eliminated.

Therefore, the user can conveniently use numpy ufuncs on the results.

I am referring to the flatten operation in step 2



From andrew at acooke.org  Sat Feb  7 17:08:09 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 7 Feb 2009 19:08:09 -0300 (CLST)
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <gmkpjn$hsp$1@ger.gmane.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>
	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>
	<20090207194834.GP14658@nexus.in-nomine.org>
	<gmkpjn$hsp$1@ger.gmane.org>
Message-ID: <6ba795a7aadcaf351089065e775555ec.squirrel@acooke.dyndns.org>

Steve Holden wrote:
>> You'd best hope the copied section was thoroughly reviewed otherwise
>> you're
>> duplicating a flaw across X other sections. And then you also best hope
>> that
>> whoever finds said flaw and fixes it is also smart enough to check for
>> similar constructs around the code base.
>>
> This is probably preferable to five different developers solving the
> same problem five different ways and introducing three *different* bugs,
> no?

someone posted some numbers that suggested that more code than normal was
copied in python 3.0.  that seems reasonable, as others have said, because
it's a new major release.  but as far as i know, this is the first time
it's been raised.  so it seems like a useful piece of information that
might help improve python in some way.  which should be welcomed.

yet the general tone of the responses has been more defensive than i would
have expected.  i don't really understand why.  nothing really terrible,
given the extremes you get on the net in general, but still a little
disappointing.

the email quoted above is a typical example.  as i said - nothing
terrible, just a misleading false dichotomy.  yes, five people solving it
five different ways would be worse, but that doesn't mean there isn't some
better solution.  surely it would be preferable if there was one way, that
didn't involve copying code, that everyone could use?

i'm not saying there is such a solution.  i'm not even saying that there
is certainly a problem.  i'm just making the quiet observation that the
original information is interesting, might be useful, and should be
welcomed.

andrew




From martin at v.loewis.de  Sat Feb  7 17:36:25 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 07 Feb 2009 23:36:25 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <mailman.9065.1234044505.3487.python-list@python.org>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>	<498D3A04.60503@v.loewis.de>	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>	<6v58gpFi7nnvU1@mid.uni-berlin.de>	<218c44da-6086-4f02-843a-5d63520348b3@f40g2000pri.googlegroups.com>	<waqdnRdgNZxFXhDUnZ2dnUVZ_uGdnZ2d@pdx.net>	<20090207194834.GP14658@nexus.in-nomine.org>	<gmkpjn$hsp$1@ger.gmane.org>
	<mailman.9065.1234044505.3487.python-list@python.org>
Message-ID: <498e0cea$0$30915$9b622d9e@news.freenet.de>

> yet the general tone of the responses has been more defensive than i would
> have expected.  i don't really understand why.  nothing really terrible,
> given the extremes you get on the net in general, but still a little
> disappointing.

I think this is fairly easy to explain. The OP closes with the question
"Does that say something about the code quality of Python3.0?"
thus suggesting that the quality of Python 3 is poor.

Nobody likes to hear that the quality of his work is poor. He then goes
on saying

"But it seems that the stable & successful software releases tend to
have relatively stable duplication rate."

suggesting that Python 3.0 cannot be successful, because it doesn't have
a relatively stable duplication rate.

Nobody likes to hear that a project one has put many month into cannot
be successful.

Hence the defensive responses.

> i'm not saying there is such a solution.  i'm not even saying that there
> is certainly a problem.  i'm just making the quiet observation that the
> original information is interesting, might be useful, and should be
> welcomed.

The information is interesting. I question whether it is useful as-is,
as it doesn't tell me *what* code got duplicated (and it seems it is
also incorrect, since it includes analysis of generated code). While I
can welcome the information, I cannot welcome the conclusion that the
OP apparently draws from them.

Regards,
Martin


From robert.kern at gmail.com  Sat Feb  7 17:47:55 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 07 Feb 2009 16:47:55 -0600
Subject: Newbie SWMixer / numpy help - AssertionError
In-Reply-To: <pej066x0mc.ln2@phoenix.fire>
References: <pej066x0mc.ln2@phoenix.fire>
Message-ID: <gml32s$ass$1@ger.gmane.org>

On 2009-02-07 08:46, Peter Chant wrote:
> Hello,
>
> I'm a bit of a python newby.  I want to play and record sound
> simultaneously.  SWMixer seems able to do this but the examples use WAV
> files.  I'm trying to play a test tone.  Can anyone give me a steer as to
> why this fails?

Looking at the SWMixer docs, you probably want

   snd = swmixer.Sound(data=tone_data)

Well, sort of. You probably need to scale your data and convert it to int16 
format. It's currently in floating point format.

When asking about why something fails, it helps a lot if you specify exactly how 
it fails and what you expected to happen. Copy-and-paste any error messages exactly.

If you need more help with SWMixer's API, I recommend asking the author. It's 
not in widespread use, so he can probably give you better and faster help than 
we can.

If you need more help with numpy, specifically, you can ask on the 
numpy-discussion mailing list. numpy *is* in widespread use, but there's a 
higher concentration of helpful numpy users over there.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From rdsc-python at tigana.org  Sat Feb  7 17:50:04 2009
From: rdsc-python at tigana.org (Randy Smith)
Date: Sat, 7 Feb 2009 17:50:04 -0500
Subject: TkInter: Problem with propagation of resize events through geometry
	manager hierarchy?
Message-ID: <6A117BEC-C653-4092-BC4B-D4FC3F0CB486@tigana.org>


Hi!  I'm looking for help with a Tkinter program's handling of resize.
I'm trying to do a fairly simple widget that shows a cropped part of a
larger image, and let's you navigate within the larger image through a
variety of methods.  The widget hierarchy is:

root
   ImageWidget (my class)
     Label (contains the image)
     Horizontal Scroll Bar
     Vertical scroll bar

The cropping and scrolling works fine.  But when I try to add
responding to resize events, I get into trouble.  Specifically:
* When I naively change the size of the image shown to be borderwidth
   less than the size indicated in the configure event, the size of the
   image shown grows gradually but inexorably when I start the test
   app.  (Sorta scary, actually :-})
* When I fiddle a bit to figure out what the actual difference in size
   is between the Configure event and the image that can be displayed,
   I get a vibrating, jagged display of the image.

Investigation suggests that multiple configure events are hitting the
label in response to each user resize with different sizes.  I'm
guessing that when I resize the image in response to those different
events, that creates new resize events propagating through the window
manager hierarchy, which creates new configure events, which means my
handler changes the image size, which ... you get the idea.  However,
everything seems to work fine if I leave out the scroll bars and just
have a label in a frame inside the root window; the image resizes
fine.  If the scroll bars are in place but I don't have the image
resize bound to the configure event, I get two sets of resize events
propagaing through the system on startup; without, I just get one.

Event lists and code included below.  Any help would be appreciated.
Thanks!

       	    	     	      	      	  -- Randy Smith

-- Event list on startup with scroll bars:

<receiving widget>: width height
root :  220 220
root :  1 1
iwidget :  220 220
root :  220 220
vscroll :  16 204
root :  16 204
hscroll :  204 16
root :  204 16
ilabel :  204 204
root :  204 204
vscroll :  15 205
root :  15 205
hscroll :  205 15
root :  205 15
ilabel :  205 205
root :  205 205
root :  219 219
ilabel :  205 205
root :  205 205
hscroll :  205 15
root :  205 15
vscroll :  15 205
root :  15 205
iwidget :  219 219
root :  219 219
vscroll :  15 204
root :  15 204
hscroll :  204 15
root :  204 15
ilabel :  204 204
root :  204 204

-- Event list on startup without scroll bars

root :  204 204
root :  1 1
iwidget :  204 204
root :  204 204
ilabel :  204 204
root :  204 204

-- Code, without image resize.  If you want to see the vibration,
    uncomment the line
         self.label.bind("<Configure>", self.reconfigure, "+")
    To actually run it you'll need an image "test.tiff" in the current
    directory (any image of size > 200x200 will do) and access to the
    python imaging library (PIL), but I hope the code is pretty clear
    (other than the math transforming between various coordinate
    systems, which I don't believe is relevant; focus on
    reconfigure(), refresh, and __init__).

#!/usr/bin/python

import traceback
from Tkinter import *
from PIL import Image
import ImageTk

debug = 4

def display_args(*args):
     print "Args: ", args

def display_event(event):
     print event.__dict__

def display_tag_and_size(tag, event):
     print tag, ": ", event.width, event.height

class NotYetImplemented(Exception): pass

def mapnum(x, fromrange, torange):
     assert fromrange[0] <= x < fromrange[1], (fromrange[0], x,  
fromrange[1])
     assert torange[0] < torange[1], (torange[0], torange[1])
     ## Need to force floating point
     x *= 1.0
     return (x - fromrange[0]) / (fromrange[1] - fromrange[0]) *  
(torange[1] - torange[0]) + torange[0]

class ImageWidget(Frame):
     def __init__(self, parent, gfunc, image_size,
                  starting_zoom=1,
                  starting_ul=(0,0),
                  starting_size = None):
         """Create an Image Widget which will display an image based  
on the
         function passed.  That function will be called with the  
arguments
         (zoom_factor, (xstart, xend), (ystart, yend)) and must return a
         TkInter PhotoImage object of size (xend-xstart, yend-ystart).
         IMAGE_SIZE describes the "base size" of the image being  
backed by
         gfunc.
         starting_* describes the starting window on the image."""

         ## Default starting size to whole image
         if not starting_size: starting_size = image_size

         ## Init parent
         Frame.__init__(self, parent)
         self.bind("<Configure>",
                   lambda e, t="iwidget": display_tag_and_size(t, e))
         ## Base image parameters
         self.generator_func = gfunc
         self.isize = image_size

         ## Modifier of base image size for coords currently working in
         self.zoom = starting_zoom

         ## Interval of augmented (zoomed) image currently shown
         ## Note that these must be integers; these map directly to  
pixels
         self.xint = [starting_ul[0], starting_ul[0] + starting_size[0]]
         self.yint = [starting_ul[1], starting_ul[1] + starting_size[1]]

         ## Widgets
         self.label = Label(self)
         print type(self.label["borderwidth"])
         self.label.bind("<Configure>",
                         lambda e, t="ilabel": display_tag_and_size(t,  
e))
         self.labelborderwidth = 4 	# XXX: Constant because I can't  
manage
         				# to get the value of
         				# self.label["borderwidth"] as a number :-?
         self.hscroll = Scrollbar(self, orient = HORIZONTAL,
                                  command = lambda *args:  
self.scmd(False, *args))
         self.hscroll.bind("<Configure>",
                         lambda e, t="hscroll":  
display_tag_and_size(t, e))

         self.vscroll = Scrollbar(self, orient = VERTICAL,
                                  command = lambda *args:  
self.scmd(True, *args))
         self.vscroll.bind("<Configure>",
                           lambda e, t="vscroll":  
display_tag_and_size(t, e))

#        self.label.bind("<Configure>", self.reconfigure, "+")

         ## Configure widgets
         self.label.grid(row = 0, column = 0, sticky=N+S+E+W)
         self.hscroll.grid(row = 1, column = 0, sticky=E+W)
         self.vscroll.grid(row = 0, column = 1, sticky=N+S)
         self.columnconfigure(0, weight=1)
         self.rowconfigure(0, weight=1)

         ## And display
         self.refresh()

     def refresh(self):
         """Bring the image in the frame and the scroll bars in line  
with the
         current values."""
         self.image = self.generator_func(self.zoom, self.xint,  
self.yint)
         self.label["image"] = self.image
         ## Map x&y interval into unit interval for scroll bars.
         scroll_settings = (
             (mapnum(self.xint[0],
                     (0, self.isize[0] * self.zoom),
                     (0, 1)),
              mapnum(self.xint[1],
                     (0, self.isize[0] * self.zoom),
                     (0, 1))),
             (mapnum(self.yint[0],
                     (0, self.isize[1] * self.zoom),
                     (0, 1)),
              mapnum(self.yint[1],
                     (0, self.isize[1] * self.zoom),
                     (0, 1))))
         if debug > 5:
             print scroll_settings
         self.hscroll.set(*scroll_settings[0])
         self.vscroll.set(*scroll_settings[1])

     def reconfigure(self, event):
         print self.label["width"], self.label["height"], event.__dict__
         self.xint[1] = min(self.xint[0]+event.width -  
self.labelborderwidth,
                            int(self.isize[0]*self.zoom))
         self.yint[1] = min(self.yint[0]+event.height -  
self.labelborderwidth,
                            int(self.isize[1]*self.zoom))
         self.refresh()

     def scmd(self, isy, type, num, what = None):
         """Takes input args, changes either xint or yint, and calls
         refresh to update the entire image."""
         ## Figure out interval to modify and base image size to work  
off
         if isy:
             interval = self.yint
             int_range = self.isize[1] * self.zoom
         else:
             interval = self.xint
             int_range = self.isize[0] * self.zoom

         ## Figure out the width
         int_width = interval[1] - interval[0]

         ## Transform input
         num = float(num)

         if type == MOVETO:
             # num Describes the location of the low end of the slider
             interval[0] = mapnum(num, (0, 1), (0, int_range))
         elif type == SCROLL:
             if what == "units":
                 interval[0] += num
             else:
                 assert what == "pages", what
                 interval[0] += num * int_width

             if interval[0] < 0: interval[0] = 0
             if interval[0] > int_range - int_width:
                 interval[0] = int_range - int_width
         interval[0] = int(interval[0])
         interval[1] = interval[0] + int_width
         assert type == MOVETO, type
         if debug > 5:
             print "yscroll" if isy else "xscroll", num, interval[0],  
interval[1]
         self.refresh()

## Room for optimization here; don't need to resize the whole image
def gfunc_for_image(image, zoom, xint, yint):
     bbox = image.getbbox()
     isize = (bbox[2] - bbox[0], bbox[3] - bbox[1])
     ssize = (isize[0] * zoom, isize[1] * zoom)

     if debug > 5:
         print zoom, xint, yint, isize, ssize
     ri = image.resize(ssize, Image.BILINEAR)
     ci = ri.crop((xint[0],yint[0],xint[1],yint[1]))
     return ImageTk.PhotoImage(ci)

def IWFromFile(parent, file, starting_size = None):
     "Return an ImageWidget object based on an image on a file."
     baseimage = Image.open(file)
     (ulx, uly, lrx, lry) = baseimage.getbbox()
     return ImageWidget(parent,
                        lambda z,xint,yint,i=baseimage:  
gfunc_for_image(i, z, xint, yint),
                        (lrx - ulx, lry - uly),
                        starting_size = starting_size)

def IWFromImage(parent, img, starting_size = None):
     "Return an imageWidget object based on a PIL image passed in."
     (ulx, uly, lrx, lry) = img.getbbox()
     return ImageWidget(parent,
                        lambda z,xint,yint,i=img: gfunc_for_image(i,  
z, xint, yint),
                        (lrx - ulx, lry - uly),
                        starting_size = starting_size)


if __name__ == "__main__":
     root = Tk()
     root.resizable(True, True)

     root.bind("<Configure>", lambda e, t="root":  
display_tag_and_size(t, e))
     iw = IWFromFile(root, "test.tiff", starting_size = (200, 200))
     print "Gridding iwidget."
     iw.grid(row=0,column=0,sticky=N+S+E+W)
     print "Configuring root row."
     root.rowconfigure(0, weight=1)
     print "Configuring root column."
     root.columnconfigure(0, weight=1)
     print "Mainlooping."
     iw.mainloop()








From chohazel at gmail.com  Sat Feb  7 18:03:07 2009
From: chohazel at gmail.com (chohazel at gmail.com)
Date: Sat, 7 Feb 2009 15:03:07 -0800 (PST)
Subject: MacPython 2.5 IDLE font size
Message-ID: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>

Hi,
Is there a way to adjust the default font size in IDLE, in MacPython
2.5? The default now is too tiny.
I have to use this version of MacPython. As far as I searched, I can't
find how I do this.
Thanks.


From google at mrabarnett.plus.com  Sat Feb  7 18:15:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 07 Feb 2009 23:15:05 +0000
Subject: Trouble with regular expressions
In-Reply-To: <c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>	<mailman.9049.1234017453.3487.python-list@python.org>
	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
Message-ID: <498E15F9.4050907@mrabarnett.plus.com>

John Machin wrote:
> On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> LaundroMat wrote:
>>> Hi,
>>> I'm quite new to regular expressions, and I wonder if anyone here
>>> could help me out.
>>> I'm looking to split strings that ideally look like this: "Update: New
>>> item (Household)" into a group.
>>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
>>> ("Update", "New item", "(Household)")
>>> Some strings will look like this however: "Update: New item (item)
>>> (Household)". The expression above still does its job, as it returns
>>> ("Update", "New item (item)", "(Household)").
> 
> Not quite true; it actually returns
>     ('Update:', ' New item (item) ', '(Household)')
> However ignoring the difference in whitespace, the OP's intention is
> clear. Yours returns
>     ('Update:', ' New item ', '(item) (Household)')
> 
The OP said it works OK, which I took to mean that the OP was OK with
the extra whitespace, which can be easily stripped off. Close enough!
> 
>>> It does not work however when there is no text in parentheses (eg
>>> "Update: new item"). How can I get the expression to return a tuple
>>> such as ("Update:", "new item", None)?
>> You need to make the last group optional and also make the middle group
>> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
> 
> Why do you perpetuate the redundant ^ anchor?
> 
The OP didn't say whether search() or match() was being used. With the ^
it doesn't matter.

>> (?:...) is the non-capturing version of (...).
> 
> Why do you use
>     (?:(subpattern))?
> instead of just plain
>     (subpattern)?
> ?
> 
Oops, you're right. I was distracted by the \( and \)! :-)


From vitaliyy at gmail.com  Sat Feb  7 18:23:01 2009
From: vitaliyy at gmail.com (Vitaliy Yermolenko)
Date: Sun, 8 Feb 2009 01:23:01 +0200
Subject: Python on TV-centric platforms
Message-ID: <ccbb236e0902071523h76059a3dl34f35a01ed8c1d16@mail.gmail.com>

Hi,

Any chance to see Python to be ready for "Widget Development Kit (WDK)
to third-party developers to create applications and services for
viewing on TVs, or to move applications to the TV from the PC viewing
environment" as on
http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx?
Thoughts/ideas?

WBR, Vitaliy.


From sjmachin at lexicon.net  Sat Feb  7 18:48:02 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 7 Feb 2009 15:48:02 -0800 (PST)
Subject: Trouble with regular expressions
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>
	<mailman.9049.1234017453.3487.python-list@python.org>
	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>
	<mailman.9068.1234048507.3487.python-list@python.org>
Message-ID: <686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>

On Feb 8, 10:15?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> John Machin wrote:
> > On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
> >> LaundroMat wrote:
> >>> Hi,
> >>> I'm quite new to regular expressions, and I wonder if anyone here
> >>> could help me out.
> >>> I'm looking to split strings that ideally look like this: "Update: New
> >>> item (Household)" into a group.
> >>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
> >>> ("Update", "New item", "(Household)")
> >>> Some strings will look like this however: "Update: New item (item)
> >>> (Household)". The expression above still does its job, as it returns
> >>> ("Update", "New item (item)", "(Household)").
>
> > Not quite true; it actually returns
> > ? ? ('Update:', ' New item (item) ', '(Household)')
> > However ignoring the difference in whitespace, the OP's intention is
> > clear. Yours returns
> > ? ? ('Update:', ' New item ', '(item) (Household)')
>
> The OP said it works OK, which I took to mean that the OP was OK with
> the extra whitespace, which can be easily stripped off. Close enough!

As I said, the whitespace difference [between what the OP said his
regex did and what it actually does] is not the problem. The problem
is that the OP's "works OK" included (item) in the 2nd group, whereas
yours includes (item) in the 3rd group.

>
> >>> It does not work however when there is no text in parentheses (eg
> >>> "Update: new item"). How can I get the expression to return a tuple
> >>> such as ("Update:", "new item", None)?
> >> You need to make the last group optional and also make the middle group
> >> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
>
> > Why do you perpetuate the redundant ^ anchor?
>
> The OP didn't say whether search() or match() was being used. With the ^
> it doesn't matter.

It *does* matter. re.search() is suboptimal; after failing at the
first position, it's not smart enough to give up if the pattern has a
front anchor.

[win32, 2.6.1]
C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.17 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
0*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.17 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
*'x'" "assert not rx.search(txt)"
100000 loops, best of 3: 4.37 usec per loop

C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
('^frobozz');txt=100
0*'x'" "assert not rx.search(txt)"
10000 loops, best of 3: 34.1 usec per loop

Corresponding figures for 3.0 are 1.02, 1.02, 3.99, and 32.9



From nick at stinemates.org  Sat Feb  7 18:56:45 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sat, 7 Feb 2009 15:56:45 -0800
Subject: Portable way to refer to the null device?
In-Reply-To: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
References: <bce93b53-4c41-4ab1-b85b-cd7ba15ee4b4@v13g2000yqm.googlegroups.com>
Message-ID: <20090207235645.GA28442@beauTy.hsd1.ca.comcast.net>

On Fri, Feb 06, 2009 at 07:32:20PM -0800, Roy Smith wrote:
> I need to run a command using subprocess.Popen() and have stdin
> connected to the null device.  On unix, I would do:
> 
>         self.process = subprocess.Popen(argv,
>                                         env=new_env,
>                                         stdout=open(outfile, 'w'),
>                                         stderr=open(errfile, 'w'),
>                                         stdin=open('/dev/null')
>                                         )
> 
> but that's not portable to windows.  Does Python have a portable way
> to get a file object connected to the null device, regardless of what
> operating system you're running on?

I normally just implement my own object:

class DevNull:
    def write(self, str):
        pass


From nick at stinemates.org  Sat Feb  7 19:09:48 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sat, 7 Feb 2009 16:09:48 -0800
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>

On Fri, Feb 06, 2009 at 09:16:02PM -0700, Vincent Davis wrote:
> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.I
> know a little html but am not sure how to integrate python or know what
> servers will handle it .....
> 
> Thanks
> Vincent Davis

I'd suggest CherryPy[1]. It's fairly welcoming to newbies, because the
web server and the framework and bundled together.

1: http://www.cherrypy.org/

HTH,
Nick



From deets at nospam.web.de  Sat Feb  7 19:32:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 01:32:00 +0100
Subject: Python on TV-centric platforms
In-Reply-To: <mailman.9069.1234048986.3487.python-list@python.org>
References: <mailman.9069.1234048986.3487.python-list@python.org>
Message-ID: <6v6ng1Fia9qkU1@mid.uni-berlin.de>

Vitaliy Yermolenko schrieb:
> Hi,
> 
> Any chance to see Python to be ready for "Widget Development Kit (WDK)
> to third-party developers to create applications and services for
> viewing on TVs, or to move applications to the TV from the PC viewing
> environment" as on
> http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx?
> Thoughts/ideas?


Given that the site shows not much more but marketing statements for 
otherwise technically unspecified systems (mentioning only a few 
buzzwords like JS & AJAX), I guess the answer is: sure python is ready. 
It is for example used in superkaramba, a widget-application even older 
than the OSX variant of the same concept.

But unless you have a concrete system in mind, with a toolchain and 
actual WDK, the answer can't possibly be final.

Diez


From exarkun at divmod.com  Sat Feb  7 19:34:04 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Sat, 7 Feb 2009 19:34:04 -0500
Subject: Portable way to refer to the null device?
In-Reply-To: <20090207235645.GA28442@beauTy.hsd1.ca.comcast.net>
Message-ID: <20090208003404.12853.378576398.divmod.quotient.7217@henry.divmod.com>

On Sat, 7 Feb 2009 15:56:45 -0800, nick at stinemates.org wrote:
>On Fri, Feb 06, 2009 at 07:32:20PM -0800, Roy Smith wrote:
>> I need to run a command using subprocess.Popen() and have stdin
>> connected to the null device.  On unix, I would do:
>>
>>         self.process = subprocess.Popen(argv,
>>                                         env=new_env,
>>                                         stdout=open(outfile, 'w'),
>>                                         stderr=open(errfile, 'w'),
>>                                         stdin=open('/dev/null')
>>                                         )
>>
>> but that's not portable to windows.  Does Python have a portable way
>> to get a file object connected to the null device, regardless of what
>> operating system you're running on?
>
>I normally just implement my own object:
>
>class DevNull:
>    def write(self, str):
>        pass

I bet this won't work.  It needs to be a "real" file - have a file
descriptor or a handle or something.

Instead, try opening os.devnull.

Jean-Paul


From terry.yinzhe at gmail.com  Sat Feb  7 19:51:15 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 16:51:15 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
Message-ID: <d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>

On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
> Terry <terry.yinzhe <at> gmail.com> writes:
>
> > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > Do you by any chance have a few examples of these? There is a lot of
> > > idiomatic code in python to e.g. acquire and release the GIL or doing
> > > refcount-stuff. If that happens to be done with rather generic names as
> > > arguments, I can well imagine that as being the cause.
> > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
>
> This isn't really fair because Python-ast.c is auto generated. ;)

Oops! I don't know that! Then the analysis will not be valid, since
too many duplications are from there.


From terry.yinzhe at gmail.com  Sat Feb  7 20:12:46 2009
From: terry.yinzhe at gmail.com (Terry)
Date: Sat, 7 Feb 2009 17:12:46 -0800 (PST)
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
Message-ID: <dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>

On 2?8?, ??8?51?, Terry <terry.yin... at gmail.com> wrote:
> On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
>
> > Terry <terry.yinzhe <at> gmail.com> writes:
>
> > > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > > Do you by any chance have a few examples of these? There is a lot of
> > > > idiomatic code in python to e.g. acquire and release the GIL or doing
> > > > refcount-stuff. If that happens to be done with rather generic names as
> > > > arguments, I can well imagine that as being the cause.
> > > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
>
> > This isn't really fair because Python-ast.c is auto generated. ;)
>
> Oops! I don't know that! Then the analysis will not be valid, since
> too many duplications are from there.

Hey!

I have to say sorry because I found I made a mistake. Because Python-
ast.c is auto-generated and shouldn't be counted here, the right
duplication rate of Python3.0 is very small (5%).
And I found the duplications are quite trivial, I wound not say that
all of them are acceptable, but certainly not a strong enough evident
for code quality.

I have made the same analysis to some commercial source code, the
dup60 rate is quite often significantly larger than 15%.


From google at mrabarnett.plus.com  Sat Feb  7 20:38:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 08 Feb 2009 01:38:44 +0000
Subject: Trouble with regular expressions
In-Reply-To: <686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>
References: <fa3b3fa6-5edb-48f2-aa93-a2dcb265c548@h16g2000yqj.googlegroups.com>	<mailman.9049.1234017453.3487.python-list@python.org>	<c795c577-7dda-4864-90a0-877070237e0e@g39g2000pri.googlegroups.com>	<mailman.9068.1234048507.3487.python-list@python.org>
	<686660e5-b7a2-4529-9b92-ae1f73cd6663@z27g2000prd.googlegroups.com>
Message-ID: <498E37A4.5020400@mrabarnett.plus.com>

John Machin wrote:
> On Feb 8, 10:15 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> John Machin wrote:
>>> On Feb 8, 1:37 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>>>> LaundroMat wrote:
>>>>> Hi,
>>>>> I'm quite new to regular expressions, and I wonder if anyone here
>>>>> could help me out.
>>>>> I'm looking to split strings that ideally look like this: "Update: New
>>>>> item (Household)" into a group.
>>>>> This expression works ok: '^(Update:)?(.*)(\(.*\))$' - it returns
>>>>> ("Update", "New item", "(Household)")
>>>>> Some strings will look like this however: "Update: New item (item)
>>>>> (Household)". The expression above still does its job, as it returns
>>>>> ("Update", "New item (item)", "(Household)").
>>> Not quite true; it actually returns
>>>     ('Update:', ' New item (item) ', '(Household)')
>>> However ignoring the difference in whitespace, the OP's intention is
>>> clear. Yours returns
>>>     ('Update:', ' New item ', '(item) (Household)')
>> The OP said it works OK, which I took to mean that the OP was OK with
>> the extra whitespace, which can be easily stripped off. Close enough!
> 
> As I said, the whitespace difference [between what the OP said his
> regex did and what it actually does] is not the problem. The problem
> is that the OP's "works OK" included (item) in the 2nd group, whereas
> yours includes (item) in the 3rd group.
> 
Ugh, right again!

That just shows what happens when I try to post while debugging! :-)

>>>>> It does not work however when there is no text in parentheses (eg
>>>>> "Update: new item"). How can I get the expression to return a tuple
>>>>> such as ("Update:", "new item", None)?
>>>> You need to make the last group optional and also make the middle group
>>>> lazy: r'^(Update:)?(.*?)(?:(\(.*\)))?$'.
>>> Why do you perpetuate the redundant ^ anchor?
>> The OP didn't say whether search() or match() was being used. With the ^
>> it doesn't matter.
> 
> It *does* matter. re.search() is suboptimal; after failing at the
> first position, it's not smart enough to give up if the pattern has a
> front anchor.
> 
> [win32, 2.6.1]
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> *'x'" "assert not rx.match(txt)"
> 1000000 loops, best of 3: 1.17 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> 0*'x'" "assert not rx.match(txt)"
> 1000000 loops, best of 3: 1.17 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> *'x'" "assert not rx.search(txt)"
> 100000 loops, best of 3: 4.37 usec per loop
> 
> C:\junk>\python26\python -mtimeit -s"import re;rx=re.compile
> ('^frobozz');txt=100
> 0*'x'" "assert not rx.search(txt)"
> 10000 loops, best of 3: 34.1 usec per loop
> 
> Corresponding figures for 3.0 are 1.02, 1.02, 3.99, and 32.9
> 
On my PC the numbers for Python 2.6 are:

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.02 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.04 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.search(txt)"
100000 loops, best of 3: 3.69 usec per loop

C:\Python26>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.search(txt)"
10000 loops, best of 3: 28.6 usec per loop

I'm currently working on the re module and I've fixed that problem:

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.28 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.match(txt)"
1000000 loops, best of 3: 1.23 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=100*'x'" "assert not rx.search(txt)"
1000000 loops, best of 3: 1.21 usec per loop

C:\Python27>python -mtimeit -s"import 
re;rx=re.compile('^frobozz');txt=1000*'x'" "assert not rx.search(txt)"
1000000 loops, best of 3: 1.21 usec per loop

Hmm. Needs more tweaking...


From yantao at telus.com  Sat Feb  7 20:46:15 2009
From: yantao at telus.com (Peter Pei)
Date: Sun, 08 Feb 2009 01:46:15 GMT
Subject: sortable table in python 3.0
Message-ID: <HPqjl.10476$Db2.10474@edtnps83>

In one of my program, I used something called MultiColumnList, which is one 
of the sortable table widgets done in python. However 3.0 sort is different. 
I googled and found couple of other implementations, but all in python 
3.0 -.

Does anyone know any solution in 3.0? or anything that has already been 
upgraded to 3.0? Thanks. 



From vincent at vincentdavis.net  Sat Feb  7 21:39:36 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 7 Feb 2009 19:39:36 -0700
Subject: simple web app, where to start
In-Reply-To: <20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
	<20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
Message-ID: <77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>

Thanks http://www.cherrypy.org/ looks like a good and simple option.
Thanks
Vincent Davis



On Sat, Feb 7, 2009 at 5:09 PM, <nick at stinemates.org> wrote:

> On Fri, Feb 06, 2009 at 09:16:02PM -0700, Vincent Davis wrote:
> > I have a simple script that takes a few input values and returns a csv
> file
> > and a few stats. If I wanted to host this on the web how would I. I have
> no
> > idea where to begin. If someone could point me in the right direction
> like
> > maybe a tutorial, tools I will need, functions..... I would appreciate
> it.I
> > know a little html but am not sure how to integrate python or know what
> > servers will handle it .....
> >
> > Thanks
> > Vincent Davis
>
> I'd suggest CherryPy[1]. It's fairly welcoming to newbies, because the
> web server and the framework and bundled together.
>
> 1: http://www.cherrypy.org/
>
> HTH,
> Nick
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From vincent at vincentdavis.net  Sat Feb  7 21:45:10 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sat, 7 Feb 2009 19:45:10 -0700
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
Message-ID: <77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>

There is a option menu in idle but you may not be able to see it.
Try launching idle via terminal. For me it was located
/Library/Frameworks/Python/Versions/Current/bin/idle2.5
When I did this I had the option menu, I guess this is a known bug. I assume
there is a font option once you get the menu.

Vincent Davis



On Sat, Feb 7, 2009 at 4:03 PM, <chohazel at gmail.com> wrote:

> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.
> Thanks.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From wuwei23 at gmail.com  Sat Feb  7 22:15:28 2009
From: wuwei23 at gmail.com (alex23)
Date: Sat, 7 Feb 2009 19:15:28 -0800 (PST)
Subject: Python on TV-centric platforms
References: <mailman.9069.1234048986.3487.python-list@python.org>
Message-ID: <f3ccc0d9-9208-4d13-b304-bff21c48ffc8@y23g2000pre.googlegroups.com>

On Feb 8, 9:23?am, Vitaliy Yermolenko <vital... at gmail.com> wrote:
> Any chance to see Python to be ready for "Widget Development Kit (WDK)
> to third-party developers to create applications and services for
> viewing on TVs [...]

The excellent XBMC[1] has had Python support for years.

1: http://xbmc.org/


From rantingrick at gmail.com  Sat Feb  7 22:58:41 2009
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 7 Feb 2009 19:58:41 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
Message-ID: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>

I want to build a 3D CAD visualization program with Python. Now before
you say this is not possible with Python here me out :)

I know OpenGL is probably my best bet BUT i want something a little
higher level than that. I am not ready for OpenGL yet.  I would like a
kit that is just above OpenGL and abstracts away all the finer
details, but not too much higher. VPython is a great kit but it is way
too high level for what i want. Here is a list of kits i am currently
looking at so if anybody can offer suggestions i would very much like
the information. Most of these are dedicated game engines but this is
all i can find

Panda 3D
OGRE
Soya 3D
VTK
Cystal Space
CG Kit
SciPy

Thanks Guy's


From rNOSPAMon at flownet.com  Sun Feb  8 02:08:29 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Sat, 07 Feb 2009 23:08:29 -0800
Subject: WebError documentation?
References: <rNOSPAMon-BC77E8.12524205022009@news.gha.chartermi.net>
	<mailman.9037.1233981452.3487.python-list@python.org>
	<rNOSPAMon-2FE521.00060807022009@news.gha.chartermi.net>
	<498de947$0$24412$426a74cc@news.free.fr>
Message-ID: <rNOSPAMon-F8B8C9.23082907022009@news.gha.chartermi.net>

In article <498de947$0$24412$426a74cc at news.free.fr>,
 Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr> wrote:

> Ron Garret a ?crit :
> > In article <mailman.9037.1233981452.3487.python-list at python.org>,
> >  Chris Rebert <clp2 at rebertia.com> wrote:
> > 
> >> On Thu, Feb 5, 2009 at 12:52 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> >>> Is there any?  Where is it?  Extensive Googling has proven fruitless.
> >> It's not a standard Python exception. A third-party library you're
> >> using must be raising it. Check the exception traceback.
> > 
> > I see I did not make myself clear.
> 
> Now *that* is an understatement...
> 
>  >  I meant the Python software package
> > called "weberror", not a generic web error.
> > 
> > http://pypi.python.org/pypi/WebError
> 
> Google is your friend:
> http://bel-epa.com/docs/thirdparty/weberror/

Thanks!

rg


From henryar2 at gmail.com  Sun Feb  8 04:10:12 2009
From: henryar2 at gmail.com (Henry Read)
Date: Sun, 8 Feb 2009 17:10:12 +0800
Subject: Python3.0 has more duplication in source code than Python2.5
In-Reply-To: <dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
Message-ID: <fb2218ba0902080110g2ee04900we1dd1515ac30040d@mail.gmail.com>

I don't think code duplication rate has strong relationship towards code
quality.

On Sun, Feb 8, 2009 at 9:12 AM, Terry <terry.yinzhe at gmail.com> wrote:

> On 2?8?, ??8?51?, Terry <terry.yin... at gmail.com> wrote:
> > On 2?8?, ??12?20?, Benjamin Peterson <benja... at python.org> wrote:
> >
> > > Terry <terry.yinzhe <at> gmail.com> writes:
> >
> > > > On 2?7?, ??7?10?, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > > > > Do you by any chance have a few examples of these? There is a lot
> of
> > > > > idiomatic code in python to e.g. acquire and release the GIL or
> doing
> > > > > refcount-stuff. If that happens to be done with rather generic
> names as
> > > > > arguments, I can well imagine that as being the cause.
> > > > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
> >
> > > This isn't really fair because Python-ast.c is auto generated. ;)
> >
> > Oops! I don't know that! Then the analysis will not be valid, since
> > too many duplications are from there.
>
> Hey!
>
> I have to say sorry because I found I made a mistake. Because Python-
> ast.c is auto-generated and shouldn't be counted here, the right
> duplication rate of Python3.0 is very small (5%).
> And I found the duplications are quite trivial, I wound not say that
> all of them are acceptable, but certainly not a strong enough evident
> for code quality.
>
> I have made the same analysis to some commercial source code, the
> dup60 rate is quite often significantly larger than 15%.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From zaheer.agadi at gmail.com  Sun Feb  8 05:38:33 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 8 Feb 2009 02:38:33 -0800 (PST)
Subject: Internal Server error
Message-ID: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>

HI
I am getting an internal server error while trying get response from a
server following is my code


   def getDetails(self,username,password):
    urllib = urllib2.Request
    idurl="https://some.server.com/"
    port=8181
    conn = httplib.HTTPSConnection("some.server.com/",8181);
    conn.debuglevel  = 1
    username = "userone"
    password = "aaaa"
    Auth = "Basic" + ecnodeURL(self,username, password)
    url= "https://some.network.com:8181/main/folder/persons/" +
username + "/attributes/atrone"
    print url
    headers = {"Authorization": Auth,"Accept": "application/json"}
    conn.request("GET", url,{},headers)
    response = conn.getresponse()
    data = response.read()
    print response.reason
    print response.


What I am getting as response

https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
C:\Python26\lib\site-packages\httplib2\__init__.py:29:
DeprecationWarning: the md5 module is deprecated; use hashlib instead
  import md5
C:\Python26\lib\site-packages\httplib2\__init__.py:44:
DeprecationWarning: the sha module is deprecated; use the hashlib
module instead
  import sha
send: 'GET https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
\nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
\r\n\r\n'
reply: 'HTTP/1.1 500 Internal Server Error\r\n'
header: Content-Type: text/html
header: Content-Language:
header: Content-Length: 1299
header: Date: Sun, 08 Feb 2009 10:25:52 GMT
header: Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
Java System Application Server 9.1_02 - Error report</title><style
type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
family:Tahoma,Arial,sans-serif;color:white;background-
color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
{font-family:Tahoma,Arial,sans-serif;color:white;background-
color:#525D76;} P {font-family:Tahoma,Arial,sans-
serif;background:white;color:black;font-size:12px;}A {color : black;}
HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
p><p><b>description</b>The server encountered an internal error ()
that prevented it from fulfilling this request.</p><p><b>exception</b>
<pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
full stack traces of the exception and its root causes are available
in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
><h3>Sun Java System Application Server 9.1_02</h3></body></html>
Internal Server Error
<httplib.HTTPResponse instance at 0x00B9CDA0>


Thanks alot


From bblais at bryant.edu  Sun Feb  8 05:42:28 2009
From: bblais at bryant.edu (Brian Blais)
Date: Sun, 8 Feb 2009 05:42:28 -0500
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
	<77e831100902071845n7f3524abh692ea6b5fa135ae4@mail.gmail.com>
Message-ID: <01AD6DB2-2750-43CC-AD2B-BA798A11BA48@bryant.edu>

Hello,

> On Sat, Feb 7, 2009 at 4:03 PM, <chohazel at gmail.com> wrote:
> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.

It is indeed a bug that the options menu doesn't show. What I did was  
to manually edit the file:

/Library/Frameworks/Python.framework/Versions/Current/lib/python2.5/ 
idlelib/config-main.def


to include the lines:

font= monaco
font-size= 13
font-bold= 0

(can't remember what the default was).


			bb


-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From deets at nospam.web.de  Sun Feb  8 06:09:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 12:09:49 +0100
Subject: Internal Server error
In-Reply-To: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
Message-ID: <6v7srtFil09hU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com schrieb:
> HI
> I am getting an internal server error while trying get response from a
> server following is my code
> 
> 
>    def getDetails(self,username,password):
>     urllib = urllib2.Request
>     idurl="https://some.server.com/"
>     port=8181
>     conn = httplib.HTTPSConnection("some.server.com/",8181);
>     conn.debuglevel  = 1
>     username = "userone"
>     password = "aaaa"
>     Auth = "Basic" + ecnodeURL(self,username, password)
>     url= "https://some.network.com:8181/main/folder/persons/" +
> username + "/attributes/atrone"
>     print url
>     headers = {"Authorization": Auth,"Accept": "application/json"}
>     conn.request("GET", url,{},headers)
>     response = conn.getresponse()
>     data = response.read()
>     print response.reason
>     print response.
> 
> 
> What I am getting as response
> 
> https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
> C:\Python26\lib\site-packages\httplib2\__init__.py:29:
> DeprecationWarning: the md5 module is deprecated; use hashlib instead
>   import md5
> C:\Python26\lib\site-packages\httplib2\__init__.py:44:
> DeprecationWarning: the sha module is deprecated; use the hashlib
> module instead
>   import sha
> send: 'GET https://some.server.com:8181/main/folder/persons/userone/attributes/atrone
> HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
> \nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
> \r\n\r\n'
> reply: 'HTTP/1.1 500 Internal Server Error\r\n'
> header: Content-Type: text/html
> header: Content-Language:
> header: Content-Length: 1299
> header: Date: Sun, 08 Feb 2009 10:25:52 GMT
> header: Connection: close
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
> www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
> Java System Application Server 9.1_02 - Error report</title><style
> type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
> serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
> family:Tahoma,Arial,sans-serif;color:white;background-
> color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
> serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
> family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
> {font-family:Tahoma,Arial,sans-serif;color:white;background-
> color:#525D76;} P {font-family:Tahoma,Arial,sans-
> serif;background:white;color:black;font-size:12px;}A {color : black;}
> HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
> h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
> p><p><b>description</b>The server encountered an internal error ()
> that prevented it from fulfilling this request.</p><p><b>exception</b>
> <pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
> full stack traces of the exception and its root causes are available
> in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
>> <h3>Sun Java System Application Server 9.1_02</h3></body></html>
> Internal Server Error
> <httplib.HTTPResponse instance at 0x00B9CDA0>

What do you expect us to do about this? That has nothing todo with 
python, what you do is that you don't speak the right way with the 
server in question, producing a stacktrace. But nobody here knows *how* 
to talk to that machine. O

Diez


From mail at joaomoreno.com  Sun Feb  8 06:18:05 2009
From: mail at joaomoreno.com (mail at joaomoreno.com)
Date: Sun, 8 Feb 2009 03:18:05 -0800 (PST)
Subject: BaseHTTPRequestHandler freezes while writing to self.wfile after 
	installing Python 3.0
References: <ffdee1a1-109a-4bfa-a1ec-5717cfbcaf44@u14g2000yqg.googlegroups.com>
Message-ID: <a96b3d30-6074-4d1c-b5d4-567f002f7ca1@41g2000yqf.googlegroups.com>

On Feb 7, 3:55?pm, m... at joaomoreno.com wrote:
> Hey guys,
>
> I'm starting to lose my head with this one.
>
> I have a class that extends BaseHTTPRequestHandler. It works fine on
> Python 2.5. And yesterday I was curious and decided to install Python
> 3.0 on my Mac (I followed this tutorial, to be sure I wasn't messing
> things up:http://farmdev.com/thoughts/66/python-3-0-on-mac-os-x-alongside-2-6-2...
> ). I tried my application on Python 3.0 and the code just freezed on
> this line:
>
> self.wfile.write(f.read())
>
> I searched and got to this bughttp://bugs.python.org/issue3826. I
> couldn't understand if there's already a fix for that. But, the
> strangest thing was that, when I tried my application on 2.5, it
> started freezing on the same spot! I then removed everything I
> installed from 3.0, fixed the paths, and it still gives me the error.
> I don't know what else to do.
>
> The app works fine on 2.5, because I tried it on another computer.
>
> Thanks for your help.

I'm sorry, it seems to have been a weird setting between routers (mac
<-> router <-> router <-> ISP) here at home.

Small files ( < 100kB ) were served with no problem at all, but larger
files got stuck. I found it out after formatting my mac, and realized
that it was still happening. I tried to remove on of the routers out
of the way and it sure works now. The real reason that caused it, and
why it worked before and suddently stopped working after
(coincidently, for sure) installing Python 3.0 is still incognito for
me.


From zaheer.agadi at gmail.com  Sun Feb  8 06:20:09 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 8 Feb 2009 03:20:09 -0800 (PST)
Subject: Internal Server error
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
	<6v7srtFil09hU1@mid.uni-berlin.de>
Message-ID: <4cb170df-2786-42fe-97e5-f243ce6401b0@o2g2000prl.googlegroups.com>

On Feb 8, 4:09?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> zaheer.ag... at gmail.com schrieb:
>
>
>
> > HI
> > I am getting an internal server error while trying get response from a
> > server following is my code
>
> > ? ?def getDetails(self,username,password):
> > ? ? urllib = urllib2.Request
> > ? ? idurl="https://some.server.com/"
> > ? ? port=8181
> > ? ? conn = httplib.HTTPSConnection("some.server.com/",8181);
> > ? ? conn.debuglevel ?= 1
> > ? ? username = "userone"
> > ? ? password = "aaaa"
> > ? ? Auth = "Basic" + ecnodeURL(self,username, password)
> > ? ? url= "https://some.network.com:8181/main/folder/persons/" +
> > username + "/attributes/atrone"
> > ? ? print url
> > ? ? headers = {"Authorization": Auth,"Accept": "application/json"}
> > ? ? conn.request("GET", url,{},headers)
> > ? ? response = conn.getresponse()
> > ? ? data = response.read()
> > ? ? print response.reason
> > ? ? print response.
>
> > What I am getting as response
>
> >https://some.server.com:8181/main/folder/persons/userone/attributes/a...
> > C:\Python26\lib\site-packages\httplib2\__init__.py:29:
> > DeprecationWarning: the md5 module is deprecated; use hashlib instead
> > ? import md5
> > C:\Python26\lib\site-packages\httplib2\__init__.py:44:
> > DeprecationWarning: the sha module is deprecated; use the hashlib
> > module instead
> > ? import sha
> > send: 'GEThttps://some.server.com:8181/main/folder/persons/userone/attributes/a...
> > HTTP/1.1\r\nHost: /some.server.com:8181\r\nAccept-Encoding: identity\r
> > \nAccept: application/json\r\nAuthorization: BasicU3RvcmFnZUVncjA1OA==
> > \r\n\r\n'
> > reply: 'HTTP/1.1 500 Internal Server Error\r\n'
> > header: Content-Type: text/html
> > header: Content-Language:
> > header: Content-Length: 1299
> > header: Date: Sun, 08 Feb 2009 10:25:52 GMT
> > header: Connection: close
> > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
> >www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html><head><title>Sun
> > Java System Application Server 9.1_02 - Error report</title><style
> > type="text/css"><!--H1 {font-family:Tahoma,Arial,sans-
> > serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-
> > family:Tahoma,Arial,sans-serif;color:white;background-
> > color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-
> > serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-
> > family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
> > {font-family:Tahoma,Arial,sans-serif;color:white;background-
> > color:#525D76;} P {font-family:Tahoma,Arial,sans-
> > serif;background:white;color:black;font-size:12px;}A {color : black;}
> > HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </
> > h1><hr/><p><b>type</b> Exception report</p><p><b>message</b></
> > p><p><b>description</b>The server encountered an internal error ()
> > that prevented it from fulfilling this request.</p><p><b>exception</b>
> > <pre>java.util.NoSuchElementException</pre></p><p><b>note</b> <u>The
> > full stack traces of the exception and its root causes are available
> > in the Sun Java System Application Server 9.1_02 logs.</u></p><hr/
> >> <h3>Sun Java System Application Server 9.1_02</h3></body></html>
> > Internal Server Error
> > <httplib.HTTPResponse instance at 0x00B9CDA0>
>
> What do you expect us to do about this? That has nothing todo with
> python, what you do is that you don't speak the right way with the
> server in question, producing a stacktrace. But nobody here knows *how*
> to talk to that machine. O
>
> Diez

Thanks,

I know there is something on the wrong side, when it says
java.util.NoSuchElementException i  thought something wrong with
setting values I just wanted you guys to point me out  there is
something wrong with the code I have written I am not very familiar
with Python the same work for java works fine.

I wanted to know if I am setting the headers correctly, getting the
response correctly
are there any better ways of encoding the url Over all Does the code
look ok...?


From jstroud at mbi.ucla.edu  Sun Feb  8 06:27:37 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 08 Feb 2009 03:27:37 -0800
Subject: TkInter: Problem with propagation of resize events through
	geometry manager hierarchy?
In-Reply-To: <mailman.9067.1234047013.3487.python-list@python.org>
References: <mailman.9067.1234047013.3487.python-list@python.org>
Message-ID: <Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>

Randy Smith wrote:
> The cropping and scrolling works fine.  But when I try to add
> responding to resize events, I get into trouble.  Specifically:
> * When I naively change the size of the image shown to be borderwidth
>   less than the size indicated in the configure event, the size of the
>   image shown grows gradually but inexorably when I start the test
>   app.  (Sorta scary, actually :-})
> * When I fiddle a bit to figure out what the actual difference in size
>   is between the Configure event and the image that can be displayed,
>   I get a vibrating, jagged display of the image.
> 
> Investigation suggests that multiple configure events are hitting the
> label in response to each user resize with different sizes.  I'm
> guessing that when I resize the image in response to those different
> events, that creates new resize events propagating through the window
> manager hierarchy, which creates new configure events, which means my
> handler changes the image size, which ... you get the idea.

I can't test your code because I don't have the test image and for some 
reason it does not recognize a tiff of my own. But, just glancing at 
your code, it looks like a quick-fix would be to set self.zoom to a 
sentinel at the end of refresh() and return 'break' at the top of the 
methods that use self.zoom if it is said sentinel value (e.g. "if 
self.zoom == WHATEVER_SENTINEL: return 'break'). You may also want to 
return 'break' for event responders that should terminate the event 
chain. This is a general technique to stop a lot of unwanted event 
propagation.

James


-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From nytrokiss at gmail.com  Sun Feb  8 06:53:07 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 8 Feb 2009 13:53:07 +0200
Subject: simple web app, where to start
In-Reply-To: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
Message-ID: <8a6b8e350902080353s51fc9d1bmc9b5e56f79509a7d@mail.gmail.com>

I use Django for all simple apps and it works great!

On Sat, Feb 7, 2009 at 6:16 AM, Vincent Davis <vincent at vincentdavis.net>wrote:

> I have a simple script that takes a few input values and returns a csv file
> and a few stats. If I wanted to host this on the web how would I. I have no
> idea where to begin. If someone could point me in the right direction like
> maybe a tutorial, tools I will need, functions..... I would appreciate it.I know a little html but am not sure how to integrate python or know what
> servers will handle it .....
>
> Thanks
> Vincent Davis
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From geert.discussions at gmail.com  Sun Feb  8 07:07:40 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Sun, 08 Feb 2009 13:07:40 +0100
Subject: Path question
In-Reply-To: <6urjrhFgvif8U1@mid.uni-berlin.de>
References: <mailman.8716.1233686855.3487.python-list@python.org>
	<6urjrhFgvif8U1@mid.uni-berlin.de>
Message-ID: <498ECB0C.5050705@gmail.com>

Diez B. Roggisch wrote:
> Geert Vancompernolle schrieb:
>> Hi,
>>
>> I have the following path construction:
>>
>> ./src/__init__.py
>>     /main.py
>>     /modules/__init__.py
>>             /application.py
>>     /ui/__init__.py
>>        /mainwindow/__init__.py
>>                   /mainwindow.py
>>
>> Now I want to call the method 'MainWindow' in the module 
>> 'mainwindow', from the module 'application'.
>>
>> I'm having the following import statement in 'applications.py':
>>
>> from .. ui.mainwindow.mainwindow import MainWindow
>>
>> That doesn't work.  I've also tried many other combinations like from 
>> ..ui.mainwindow...  but none of them work.
>>
>> I always get the following error:
>>
>> "Attempted relative import beyond toplevel package"
>>
>> How can I import the method 'MainWindow' from 'mainwindow' into 
>> 'application', using the explicit relative import rules?
>>
>> Or is there a better way to do this?
>>  
>
> Rename "src" to "myapp", and start main.py from above that. That 
> should work.
>
>
>
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list
>
That trick did it, thanks!

But I have one more unclarity about relative import rules.  Here 
<http://docs.python.org/tutorial/modules.html?highlight=modules>, one 
can find an explanation about modules in the official Python 2.6.1 
documentation.

In that article, there's an example of importing relative packages (in 
the section "Packages").

I see the following examples:

from . import echo
from .. import formats
from ..filters import equalizer


Applying that mechanism on my application, I'm using the following construction (see my initial email):

"from .. ui.mainwindow.mainwindow import MainWindow"

But using "from ..ui.mainwindow.mainwindow import MainWindow" seems to be giving exactly the same result (mind the lacking space between ".." and "ui").

So, what's the difference (if there is one) between "from .. ui.mainwin..." and "from ..ui.mainwin..." (again, mind the difference in space)?

I guess there's a difference, otherwise it would not be given as an example in the Python documentation.  But then, why is the application (at first sight) behaving the same and also working fine?


-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From gil.shinar at gmail.com  Sun Feb  8 07:22:25 2009
From: gil.shinar at gmail.com (gil.shinar at gmail.com)
Date: Sun, 8 Feb 2009 04:22:25 -0800 (PST)
Subject: Process crash with no reason
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
Message-ID: <6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>

On Jan 28, 7:37?pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Jan 28, 2009, at 12:12 PM, gil.shi... at gmail.com wrote:
>
> > On Jan 27, 5:59 pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> >> On Jan 27, 2009, at 10:34 AM, gil.shi... at gmail.com wrote:
> >>> On Jan 27, 2:10 pm, Tim Golden <m... at timgolden.me.uk> wrote:
> >>>> Then how are you interacting with Sybase?
>
> >>> I'm using python's functions to run sybase sql commands.
>
> >> Can you give a short code sample? I'm unaware of how one would use ?
> >> the
> >> standard Python library to talk to Sybase, unless Sybase has a raw
> >> socket interface or some such.
>
> > First of all I have found the following python's import:
>
> > import Sybase
>
> This isn't part of the Python standard library. It's a 3rd party ?
> module -- exactly what we were looking for.
>
> Personally, I think this (or another C++ or C-based 3rd party module ?
> that you use heavily) is your prime suspect for the origin of the ?
> crashes you're having. That's not because I think the people who wrote ?
> or maintain it are bad or lazy coders. In fact, it's no reflection on ?
> their skill at all. It's just that a lot more people have used and ?
> exercised the Python standard library modules. A 3rd party module like ?
> this one will be less well-used and therefore less well-tested and ?
> therefore more likely to contain a bug that causes a crash.
>
> That said, I don't know how to advise you to proceed from here. You ?
> could perhaps turn on logging at the database level. I know Postgres, ?
> for instance, can write very detailed logs and so if you get a crash ?
> at 9:33:22 you can look in the log and see what was happening at that ?
> time. If you get several crashes and they all happen when a certain ?
> SQL statement is being executed, that's probably the culprit.
>
> You could also alter the Sybase module to add logging using Python's ?
> logging module. Who knows, it might already be there, waiting to be ?
> turned on with a switch.
>
> But I'm jumping the gun a little. As I said, it could be this module ?
> or another that's causing your problem. It's a lot easier to cause a ?
> hard crash using C or C++ than it is using pure Python, so pure Python ?
> modules would be lower on my list of suspects. Enumerate all of the ?
> modules you're using and find out where they come from. Any of them ?
> that are not in the standard library and are not written in pure ?
> Python should top your list of suspects.
>
> Good luck
> Philip

Thanks a lot and sorry for the late response. My main suspect is the
CherryPy.
I'm still investigating it.

Gil


From loredana.pier at gmail.com  Sun Feb  8 07:46:43 2009
From: loredana.pier at gmail.com (loredana.pier at gmail.com)
Date: Sun, 8 Feb 2009 04:46:43 -0800 (PST)
Subject: The fastest way  to convert a long list of date
Message-ID: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>

If I want to convert a single date format I can do:

import datetime, dateutil.parser
d = dateutil.parser.parse('2008-09-26)
print d.strftime('%A %d, %b %y' )

but if I want convert a long list of time how can do it in the fastest
way?
for example:
from ['2008-09-26?, '2008-09-28?, '2008-09-29?,.............]
to [?26 sep?,?28 sep?,?29 sep?,................]

Thank you

Loredana


From Pat at junk.net  Sun Feb  8 07:51:32 2009
From: Pat at junk.net (Pat)
Date: Sun, 08 Feb 2009 07:51:32 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de>	<gmc979$b9r$1@aioe.org>
	<mailman.8795.1233773421.3487.python-list@python.org>
Message-ID: <gmmkfg$pcf$1@aioe.org>

Gabriel Genellina wrote:
> En Wed, 04 Feb 2009 12:38:04 -0200, Pat <Pat at junk.net> escribi?:
>> Andreas Waldenburger wrote:
>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>> Tobiah wrote:
>>>>> Just out of curiosity, why was len() made to
>>>>> be it's own function?  I often find myself
>>>>> typing things like my_list.len before I
>>>>> catch myself.
> 
>>>> I'm surprised that no one responded to that question.
>>>>
>>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>>> Might it be that your newsserver is a bit laggy?
>>
>> Might be laggy.  Who knows.
>> Why didn't you answer the len() question?
> 
> Why should he? Why didn't you look for the answer yourself, after being 
> told that it existed? Why do you expect *us* to repeat ourselves again 
> and again? Don't be so lazy...
> 

Why do *us* feel obligated to respond?  Is there a gun pointed at your 
heads forcing to giving a bellicose responses?

Who is this *us*?  A secret society?  An exclusive club?

New rule:  If you don't like a question or a post, simply ignore it.  We 
don't enjoy your snarky repartee.


From Pat at junk.net  Sun Feb  8 07:54:13 2009
From: Pat at junk.net (Pat)
Date: Sun, 08 Feb 2009 07:54:13 -0500
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>	<gmc979$b9r$1@aioe.org>
	<mailman.8798.1233774905.3487.python-list@python.org>
Message-ID: <gmmkkh$pcf$2@aioe.org>

Terry Reedy wrote:
> Pat wrote:
>> Andreas Waldenburger wrote:
>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>
>>>> Tobiah wrote:
>>>>> Just out of curiosity, why was len() made to
>>>>> be it's own function?  I often find myself
>>>>> typing things like my_list.len before I
>>>>> catch myself.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Toby
>>>> I'm surprised that no one responded to that question.
>>>>
>>> Huh? Gabriel Genellina replied about 46 minutes after it was posted.
>>> Might it be that your newsserver is a bit laggy?
>>>
>>> regards
>>> /W
>>>
>>
>> Might be laggy.  Who knows.
>>
>> Why didn't you answer the len() question?
> 
> I didn't respond because it has been asked and answered before, so the 
> answer can be found in the google archives or even maybe the FAQ.

Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?

If you didn't feel like answering the question, why did you add an 
utterly worthless post?



From clp2 at rebertia.com  Sun Feb  8 08:05:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 05:05:33 -0800
Subject: The fastest way to convert a long list of date
In-Reply-To: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902080505x419ce59eq9db1a0df6381bdbc@mail.gmail.com>

On Sun, Feb 8, 2009 at 4:46 AM,  <loredana.pier at gmail.com> wrote:
> If I want to convert a single date format I can do:
>
> import datetime, dateutil.parser
> d = dateutil.parser.parse('2008-09-26)
> print d.strftime('%A %d, %b %y' )
>
> but if I want convert a long list of time how can do it in the fastest
> way?
> for example:
> from ['2008-09-26', '2008-09-28', '2008-09-29',.............]
> to ['26 sep','28 sep','29 sep',................]

import datetime
from dateutil.parser import parse
orig_dates = ['2008-09-26', '2008-09-28', ...]#etc
converted_dates = [parse(datestr).strftime('%A %d, %b %y' ) for
datestr in orig_dates]

Or if an iterator would be okay instead of a list, you can substitute
the list comprehension for itertools.imap():

#setup same as before
from itertools import imap
converted_dates = imap(lambda datestr: parse(datestr).strftime('%A %d,
%b %y' ), orig_dates)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From peke at iki.fi  Sun Feb  8 08:20:00 2009
From: peke at iki.fi (=?ISO-8859-1?Q?Pekka_Kl=E4rck?=)
Date: Sun, 8 Feb 2009 15:20:00 +0200
Subject: Changing return of type(obj)
In-Reply-To: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
References: <d5e947120902060303w2b24e2f6s4cd20830fa5981b8@mail.gmail.com>
Message-ID: <7dedbb6d0902080520i52f2ffcenb52f53ed3b0277e2@mail.gmail.com>

2009/2/6 Ken Elkabany <Ken at elkabany.com>:
>
> I am attempting to fully-simulate an 'int' object with a custom object type.
> It is part of a library I am creating for python futures and promises. Is
> there anyway such that type(my_object) can return <type 'int'>?

If it's enough to change how the type looks like you can simply change its repr:

>>> class X(type):
...   def __repr__(self):
...     return 'xxx'
...
>>> class Y(object):
...   __metaclass__ = X
...
>>> type(Y())
xxx


Cheers,
    .peke


From digitig at gmail.com  Sun Feb  8 08:24:12 2009
From: digitig at gmail.com (Tim Rowe)
Date: Sun, 8 Feb 2009 13:24:12 +0000
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
In-Reply-To: <e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com>
	<e0792554c10abc4ecc0267832be86418.squirrel@acooke.dyndns.org>
Message-ID: <aee48b3c0902080524k49f48a40kff1e9ccf9386c4cd@mail.gmail.com>

2009/2/7 andrew cooke <andrew at acooke.org>:
>
> there's a justification for this awful mess here -
> http://mail.python.org/pipermail/python-3000/2006-March/000104.html
>
> i didn't know about this, and even after reading steven's broken (i
> assume) example, managed to get it backwards.

What's awful about it? Except in the sense of inspiring awe, of
course. No, Steven's example isn't broken, it works as the epydoc
authors intended.

> (it's still in 3).

Good.

--
Tim Rowe


From Ron.Barak at lsi.com  Sun Feb  8 08:36:17 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 8 Feb 2009 13:36:17 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <mailman.41126.1234094855.3486.python-list@python.org>
References: <mailman.41126.1234094855.3486.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>

Hi,

I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
I do not need the cStringIO.StringO in the target object.
The target instance is to be pickled.

Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.

However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()

Is there a way to create a copy of the instance, sans the cStringIO.StringO ?

If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).

Can you suggest a better way ?

Thanks,
Ron.

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 388, in <module>
    for_pickle_log_stream = copy.deepcopy(log_stream)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 291, in _deepcopy_inst
    state = deepcopy(state, memo)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 254, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "c:\Python25\lib\copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "c:\Python25\lib\copy.py", line 322, in _reconstruct
    y = callable(*args)
  File "c:\Python25\lib\copy_reg.py", line 92, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
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From bblais at bryant.edu  Sun Feb  8 08:36:36 2009
From: bblais at bryant.edu (Brian Blais)
Date: Sun, 8 Feb 2009 08:36:36 -0500
Subject: simple web app, where to start
In-Reply-To: <77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>
References: <77e831100902062016q2d92ee3awb907baf47f477858@mail.gmail.com>
	<20090208000948.GB28442@beauTy.hsd1.ca.comcast.net>
	<77e831100902071839r48806b22x26cff29781b412f1@mail.gmail.com>
Message-ID: <937E51FC-44E0-4268-9FF3-961B8ECBECF9@bryant.edu>

On Feb 7, 2009, at 21:39 , Vincent Davis wrote:

> Thanks http://www.cherrypy.org/ looks like a good and simple option.
>

it is a nice option, but I prefer www.webpy.org over cherrypy.  It's  
a bit easier, and there is less magic.  I've done really simple  
scripts, to semi-complex web apps with it.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From __peter__ at web.de  Sun Feb  8 08:52:27 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 08 Feb 2009 14:52:27 +0100
Subject: The fastest way  to convert a long list of date
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
Message-ID: <gmmo2r$u3m$02$1@news.t-online.com>

loredana.pier at gmail.com wrote:

> If I want to convert a single date format I can do:
> 
> import datetime, dateutil.parser
> d = dateutil.parser.parse('2008-09-26)
> print d.strftime('%A %d, %b %y' )
> 
> but if I want convert a long list of time how can do it in the fastest
> way?
> for example:
> from ['2008-09-26?, '2008-09-28?, '2008-09-29?,.............]
> to [?26 sep?,?28 sep?,?29 sep?,................]

For large source lists the following should be quite fast...

months = "jan feb mar apr may jun jul aug sep oct dec".split()
lookup = dict(("%02d-%02d" % (mi+1, d), "%02d-%s" % (d, m)) for mi, m in
enumerate(months) for d in range(1, 32))

source = ["2008-09-26", "2008-09-28", "2008-09-29"]
print [lookup[d[-5:]] for d in source]


... but it is also very brittle. Various compromises are possible, but to
find the best would require that you tell us a bit more about your use
case. In my experience people are a bit too fast to demand "fast".

Peter


From lists at cheimes.de  Sun Feb  8 09:01:04 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 15:01:04 +0100
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
Message-ID: <gmmoj0$mlh$1@ger.gmane.org>

Barak, Ron schrieb:
> Hi,
> 
> I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> I do not need the cStringIO.StringO in the target object.
> The target instance is to be pickled.
> 
> Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
> 
> However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
> 
> Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
> 
> If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
> 
> Can you suggest a better way ?

You can overwrite some functions in order to omit attributes from a
pickle. It's all documented at
http://docs.python.org/library/pickle.html#pickling-and-unpickling-normal-class-instances

Christian



From hall.jeff at gmail.com  Sun Feb  8 09:04:29 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Sun, 8 Feb 2009 06:04:29 -0800 (PST)
Subject: easy_install
Message-ID: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>

For the life of me I can not figure out how to get easy_install to
work. The syntax displayed on the web page does not appear to work
properly.

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

Is there a simpler way to install a python egg? Or am I missing
something with easy_install?


From detlev at die-offenbachs.de  Sun Feb  8 09:05:08 2009
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Sun, 08 Feb 2009 15:05:08 +0100
Subject: ANN: eric 4.3.0 released
Message-ID: <gmmoqk$qdu$2@online.de>

Hi,

this is to inform all of you about the immediate availability of the long
awaited 4.3.0 release. It includes enhancements in nearly every area.
Please see for yourself by downloading it from 

http://eric-ide.python-projects.org/index.html

eric4 is a Python (and Ruby) IDE written using PyQt4 and QScintilla2. It
comes with batteries included and is extensible via a built-in plug-in
system. Plug-ins are available via the internet from the eric4 plugin
repository. Please see the a.m. web site for more details.

Regards,
Detlev
-- 
Detlev Offenbach
detlev at die-offenbachs.de


From elsjaako at gmail.com  Sun Feb  8 09:11:36 2009
From: elsjaako at gmail.com (elsjaako)
Date: Sun, 8 Feb 2009 06:11:36 -0800 (PST)
Subject: receive and react to MIDI input
References: <9bb30fb9-c929-4296-84c6-9ebc4932157f@i24g2000prf.googlegroups.com>
Message-ID: <46da09d0-4392-43ce-b3e6-b962c82de371@x10g2000yqk.googlegroups.com>

On Jan 29, 8:33?pm, elsjaako <elsja... at gmail.com> wrote:
> Hi all. I want to write an application that reads midi notes and then
> does something (specifically, play sound files, but that doesn't
> really matter for this question). I'm on windows.
>
> Bart de Waal

I got it working, quickly packed it up, and posted it to sourceforge.
See http://sourceforge.net/projects/winpymidiin/.


From deets at nospam.web.de  Sun Feb  8 09:27:22 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 15:27:22 +0100
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
Message-ID: <6v88eaFifbroU1@mid.uni-berlin.de>

hall.jeff at gmail.com wrote:

> For the life of me I can not figure out how to get easy_install to
> work. The syntax displayed on the web page does not appear to work
> properly.
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

It usually works for me - so what does "not appear to work properly"
actually mean?

Diez


From deets at nospam.web.de  Sun Feb  8 09:45:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 08 Feb 2009 15:45:33 +0100
Subject: Internal Server error
References: <eb65de5b-d087-4604-904e-9c58eec70605@s9g2000prg.googlegroups.com>
	<6v7srtFil09hU1@mid.uni-berlin.de>
	<4cb170df-2786-42fe-97e5-f243ce6401b0@o2g2000prl.googlegroups.com>
Message-ID: <6v89gdFiiagkU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com wrote:

> On Feb 8, 4:09?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> zaheer.ag... at gmail.com schrieb:
>>
>>
>>
>> > HI
>> > I am getting an internal server error while trying get response from a
>> > server following is my code
>>
>> > def getDetails(self,username,password):
>> > urllib = urllib2.Request
>> > idurl="https://some.server.com/"
>> > port=8181
>> > conn = httplib.HTTPSConnection("some.server.com/",8181);
>> > conn.debuglevel ?= 1
>> > username = "userone"
>> > password = "aaaa"
>> > Auth = "Basic" + ecnodeURL(self,username, password)
>> > url= "https://some.network.com:8181/main/folder/persons/" +
>> > username + "/attributes/atrone"
>> > print url
>> > headers = {"Authorization": Auth,"Accept": "application/json"}
>> > conn.request("GET", url,{},headers)
>> > response = conn.getresponse()
>> > data = response.read()
>> > print response.reason
>> > print response.

> Thanks,
> 
> I know there is something on the wrong side, when it says
> java.util.NoSuchElementException i  thought something wrong with
> setting values I just wanted you guys to point me out  there is
> something wrong with the code I have written I am not very familiar
> with Python the same work for java works fine.

Well, it's obviously not the same. Otherwise it *would* work fine as well.

your code is a bit non-idiomatic:

urllib = urllib2.Request

is *very* misleading, aliasing a class-constructor with a well-known
modulename.

Not using username & password also isn't really making sense.

"ecnodeURL" - what is that? Where does that come from - certainly not from
the stdlib, that's got a better spelling correction.

Instead of 

"string" + variable + "string"

on usually uses string interpolation to build complicated strings:

"some text %s some more text" % variable



> 
> I wanted to know if I am setting the headers correctly, getting the
> response correctly
> are there any better ways of encoding the url Over all Does the code
> look ok...?

You seem to make the call correctly. Just not what the server expects.

Diez



From davidgshi at yahoo.co.uk  Sun Feb  8 10:05:50 2009
From: davidgshi at yahoo.co.uk (David Shi)
Date: Sun, 8 Feb 2009 15:05:50 +0000 (GMT)
Subject: Dynamically updating sections of webpage
Message-ID: <851179.67701.qm@web26306.mail.ukl.yahoo.com>

I want to dynamically update sections of webpage, something like a div or table or frame.
?
Where can I find best examples/demos for this?? Preferably with a generic loader.
?
I would also like to find a best book on this.? It needs to be concise, well explained and can be applied universally.
?
Is there a book or reference like "Accelerated DOM Scripting with Ajax, APIs and Libraries and Python"?
?
Can anyone point me towards the right direction.? Please -- no over loaded websites.
?
I like to read Newtonian style of text!
?
Sincerely,
?
David


      
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From curiouserrandy at gmail.com  Sun Feb  8 10:08:11 2009
From: curiouserrandy at gmail.com (curiouserrandy at gmail.com)
Date: Sun, 8 Feb 2009 07:08:11 -0800 (PST)
Subject: TkInter: Problem with propagation of resize events through 
	geometry manager hierarchy?
References: <mailman.9067.1234047013.3487.python-list@python.org> 
	<Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>
Message-ID: <35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>

On Feb 8, 6:27?am, James Stroud <jstr... at mbi.ucla.edu> wrote:

> I can't test your code because I don't have the test image and for some
> reason it does not recognize a tiff of my own. But, just glancing at
> your code, it looks like a quick-fix would be to set self.zoom to a
> sentinel at the end of refresh() and return 'break' at the top of the
> methods that use self.zoom if it is said sentinel value (e.g. "if
> self.zoom == WHATEVER_SENTINEL: return 'break'). You may also want to
> return 'break' for event responders that should terminate the event
> chain. This is a general technique to stop a lot of unwanted event
> propagation.

Thanks!  I hadn't known about the "return 'break'" technique.  But
I don't follow your sentinel suggestion; how would that sentinel
ever get reset?  It seems as if the first time through the event
chain it'd be set to the sentinel, and the routines that pay
attention to it would never execute.  What am I missing?
I tried simply returning 'break' at the end of "refresh()" and
that made no change in behavior.

(Note that zoom should be constant at 1.0 for the life of
this program; I put it in because I'm planning to put in expansion/
contraction of images after I get resize & scrolling working
together.  Eliminating all multiplications by self.zoom confirms
this belief; no change in behavior).

One thing I've been looking for (including in the source :-J) is
a description of the precise process that the geometry manager
goes through in figuring out and then setting sizes for the
various widgets (on resize or, apparently, startup).  I suspect
with that + the "return 'break'" technique I could get this to
work.  But I haven't been having any luck finding that documentation.

If you'd like me to send you the test.tiff image, I'm happy to, but
it's nothing special; just a screen capture of a random google maps
satellite view that I use for testing.

                             -- Randy


>
> James
>
> --
> James Stroud
> UCLA-DOE Institute for Genomics and Proteomics
> Box 951570
> Los Angeles, CA 90095
>
> http://www.jamesstroud.com



From hall.jeff at gmail.com  Sun Feb  8 10:21:30 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Sun, 8 Feb 2009 07:21:30 -0800 (PST)
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
Message-ID: <4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>

On Feb 8, 9:27?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> hall.j... at gmail.com wrote:
> > For the life of me I can not figure out how to get easy_install to
> > work. The syntax displayed on the web page does not appear to work
> > properly.
>
> > easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
>
> It usually works for me - so what does "not appear to work properly"
> actually mean?
>
> Diez

http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-installing-a-package

seems to imply that after installation I can goto a command prompt and
type

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

I tried doing this in the python interpreter and on a straight "cmd"
command prompt (the site doesn't really specify). I also tried "import
easy_install" and then

easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
easy_install ("c:\MySQL_python-1.2.2-py2.4-win32.egg")

and a couple other permutations and never got it to run (error
messages for the first group were "invalid syntax" and were various
flavors of "module not callable" for the second group).



From apt.shansen at gmail.com  Sun Feb  8 10:31:14 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 8 Feb 2009 07:31:14 -0800
Subject: Process crash with no reason
In-Reply-To: <6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
	<6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
Message-ID: <7a9c25c20902080731t616ea63diba1dff99d4a2779e@mail.gmail.com>

> Thanks a lot and sorry for the late response. My main suspect is the
> CherryPy.
> I'm still investigating it.

You're asking for advice but not listening to what people are saying
here -- why is CherryPy on the top of your list?

What version of CherryPy is it? 1 or 2?

If its 2, then its pure python and there's a really, really low chance
that its provoking a hard crash w/o a traceback printing before it
dies out. A hard crash which isn't printing an error message is
possible in pure Python I suppose, but I've never seen it. A "Bus
error" for example will kill the interpreter before it can do any
error handling. But I've only ever seen that when interfacing with
third party libraries.

If its 1, there is some C so you can bump it up ... and for that I'd
probably attempt to run the application in a console or with stdout
manually redirected instead of relying on the logging alone, to see if
anything useful gets put out.. like "Bus error", at the time it exits.

But why do you keep discarding the Sybase module?

Its most definitely *not* written in python. What Philip and Tim were
trying to tell you is you are *not* using "python's functions to run
sybase sql commands"

The Sybase module is a python wrapper around code written in C module
which is interfacing with a third party library to talk to Sybase. Are
you at the latest version of Sybase(0.39 if its the same module I'm
aware of?) How about the library underneath it? FreeTDS or Sybase ASE
(whatever that is) or whatever else is being used? A bug in /any/ of
those C layers (notice its *multiple* layers) could propagate up and
provoke a hard crash that Python doesn't catch. So if you look into
those versions perhaps one has a new release that fixes bugs.

--S


From duncan.booth at invalid.invalid  Sun Feb  8 10:34:03 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 8 Feb 2009 15:34:03 GMT
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
Message-ID: <Xns9BAC9E592D5Aduncanbooth@127.0.0.1>

hall.jeff at gmail.com wrote:

> http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-ins
> talling-a-package 
> 
> seems to imply that after installation I can goto a command prompt and
> type
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
> 
> I tried doing this in the python interpreter and on a straight "cmd"
> command prompt (the site doesn't really specify). 

Start a Windows command prompt. You probably don't have the directory 
containing easy_install on your path, so use the 'cd' command to change to 
the directory it was installed in: that will be the Scripts directory under 
the directory to which you installed Python. So since you seem to be using 
Python 2.4 that might be:

C:\>cd C:\Python24\Scripts

C:\Python24\Scripts>easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

Alternatively in a single command:

C:\>C:\Python24\Scripts\easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg



From xie.kenneth at gmail.com  Sun Feb  8 10:45:15 2009
From: xie.kenneth at gmail.com (Ken)
Date: Sun, 8 Feb 2009 23:45:15 +0800
Subject: Quetion about flags of socket.recv(bufsize, [flags])
Message-ID: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>

I want to receive 4 bytes from a connected socket, I code like this:

data = sock.recv(4)

There is a problem with above code. The recv method will not block until it
get all 4 bytes. So I use the second param of recv method like this

data = sock.recv(4, socket.MSG_WAITALL)

This works fine on linux with python 2.5, while on windows, the interpreter
tells me 'AttributeError: 'module' object has no attribute 'MSG_WAITALL''.
How can I work this out, or there is another way to get certain bytes from a
socket and block if it hasn't got enough bytes?

:)
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From steve at holdenweb.com  Sun Feb  8 11:09:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 11:09:15 -0500
Subject: Quetion about flags of socket.recv(bufsize, [flags])
In-Reply-To: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>
References: <8af39e160902080745j13f4451dtcdf0f6007a57f188@mail.gmail.com>
Message-ID: <gmn03n$bcp$1@ger.gmane.org>

Ken wrote:
> I want to receive 4 bytes from a connected socket, I code like this:
> 
> data = sock.recv(4)
> 
> There is a problem with above code. The recv method will not block until
> it get all 4 bytes. So I use the second param of recv method like this
> 
> data = sock.recv(4, socket.MSG_WAITALL)
> 
> This works fine on linux with python 2.5, while on windows, the
> interpreter tells me 'AttributeError: 'module' object has no attribute
> 'MSG_WAITALL''.  How can I work this out, or there is another way to get
> certain bytes from a socket and block if it hasn't got enough bytes?
> 
If you *need* 4 bytes then the best way to receive them is simply to
loop until you get them (assuming you are using blocking sockets):

BLOCKSIZE = 4
buffer = ""
while len(buffer) < BLOCKSIZE:
  data = sock.recv(BLOCKSIZE-len(buffer))
  if not data:
    break # other end is closed!
  buffer += data

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Ron.Barak at lsi.com  Sun Feb  8 11:17:34 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 8 Feb 2009 16:17:34 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <mailman.41126.1234094855.3486.python-list@python.org>
References: <mailman.41126.1234094855.3486.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68779F@enbmail01.lsi.com>

Hi John,

Maybe you encountered the below issue in your Python programming, and you may offer advise ?

I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
I do not need the cStringIO.StringO in the target object.
The target instance is to be pickled.

Googling made me devise the following plan: do a copy/deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.

However, trying to use copy.deepcopy produced (see full traceback below my signature): TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()

Is there a way to create a copy of the instance, sans the cStringIO.StringO ?

If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).

Trying that, I did:

            for_pickle_log_stream = LogStream(sac_log_file)
            for key in log_stream.__dict__:
                if key != "input_file":
                    for_pickle_log_stream[key] = log_stream[key]

But that gave me:

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 393, in <module>
    for_pickle_log_stream[key] = log_stream[key]
AttributeError: FailoverMatches instance has no attribute '__getitem__'

Can you suggest a better way ?



Another question: Do you have an example of creating a __getitem__ method for my class?
The class includes the following:

log_stream.__dict__:
{   'db': [   {   'DPM': 'iSW-00-090',
                  'end_time': '2009 Dec 15 16:17:24',
                  'event': 'Volume failover',
                  'event_duration': 0L,
                  'first_line_pos': 12453,
                  'last_line_pos': 12871,
                  'rec_num': 0,
                  'start_time': '2009 Dec 15 16:17:24',
                  'volume_name': 'Domain 5:DVol1_1'},
              {   'DPM': 'iSW-00-090',
                  'end_time': '2009 Dec 15 16:17:24',
                  'event': 'Volume failover',
                  'event_duration': 0L,
                  'first_line_pos': 13409,
                  'last_line_pos': 13827,
                  'rec_num': 1,
                  'start_time': '2009 Dec 15 16:17:24',
                  'volume_name': 'Domain 5:DVol1_2'}],
    'end_timestamp': 1260886645L,
    'file_pointer': 58180,
    'filename_array': [   u'C:\\Documents and Settings\\rbarak\\rbarak_devel\\LogManager\\logs_3_vol\\sac.log.367lines.gz'],
    'input_file': <cStringIO.StringO object at 0x01B3D700>,
    'last_line_offset': 58181,
    'log_stream_array': [<LogStream.LogStream instance at 0x01B87350>]}

(the red item is not needed in the target object).

Thanks,
Ron.

Traceback (most recent call last):
  File "c:\Documents and Settings\rbarak\rbarak_devel\LogManager\./failover_pickle_demo02.py", line 388, in <module>
    for_pickle_log_stream = copy.deepcopy(log_stream)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 291, in _deepcopy_inst
    state = deepcopy(state, memo)
  File "c:\Python25\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "c:\Python25\lib\copy.py", line 254, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "c:\Python25\lib\copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "c:\Python25\lib\copy.py", line 322, in _reconstruct
    y = callable(*args)
  File "c:\Python25\lib\copy_reg.py", line 92, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
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From loredana.pier at gmail.com  Sun Feb  8 11:30:06 2009
From: loredana.pier at gmail.com (loredana.pier at gmail.com)
Date: Sun, 8 Feb 2009 08:30:06 -0800 (PST)
Subject: The fastest way to convert a long list of date
References: <a1d9be6f-7473-4dd2-b9b3-96d1793c7c7a@o36g2000yqh.googlegroups.com>
	<gmmo2r$u3m$02$1@news.t-online.com>
Message-ID: <ed37cba6-8b99-42f7-8b4e-926cf028e974@s20g2000yqh.googlegroups.com>

First of all: Thanks for your reply
My use case is the following:
I perform a query to DB and the result of query is this;

>>> print rows
{?Label?: {'2009:01:30': 9, '2009:01:28': 13, '2009:01:29': 19,
'2009:01:26': 1, '2009:01:27': 3, '2009:01:20': 86, '2009:01:22': 3,
'2009:01:23': 12, '2009:02:07': 3, '2009:02:06': 12, '2009:02:05': 15,
'2009:02:04': 12, '2009:02:02': 2}}

I want to make a chart with this data using JSON format where:
?	the key ?Label? is the title of chart,
?	rows['Label'].keys() is x values,
?	rows[?Label?].values() is the y values

So my goal is:

1)	to fill the bin of chart with no data (for example  in this tupla..
[.., '2009:01:28: 9, '2009:01:30: 13,..].. the date '2009:01:29? is
missing and I want to append the value ['2009:01:29?,0] to rows
[?Label?])

2)	convert the date format (for example in '%A %d, %b %y')

3)	transform rows dictionary in JSON code

The point 3) is easy to implement but I?m wondering which is the best
way to implement the point 1) and 2) ...considering it will be used
for a web application (CherryPy)?

thanks,

Loredana


From aahz at pythoncraft.com  Sun Feb  8 11:32:05 2009
From: aahz at pythoncraft.com (Aahz)
Date: 8 Feb 2009 08:32:05 -0800
Subject: ElementTree and clone element toot
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
Message-ID: <gmn1e5$3eh$1@panix3.panix.com>

In article <4986bfd7$0$9385$ba4acef3 at news.orange.fr>,
m.banaouas <banaouas.medialog at wanadoo.fr> wrote:
>
>Working with the ElementTree module, I looked for clone element
>function but not found such tool:

Have you tried using copy.deepcopy()?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From geekmail at usenot.de  Sun Feb  8 11:44:14 2009
From: geekmail at usenot.de (Andreas Waldenburger)
Date: Sun, 8 Feb 2009 17:44:14 +0100
Subject: len()
References: <pan.2009.01.27.22.30.29.337999@tobiah.org> <gm254n$14l$1@aioe.org>
	<20090131201648.201b6ed5@usenot.de> <gmc979$b9r$1@aioe.org>
	<mailman.8798.1233774905.3487.python-list@python.org>
	<gmmkkh$pcf$2@aioe.org>
Message-ID: <20090208174414.4837b34c@usenot.de>

On Sun, 08 Feb 2009 07:54:13 -0500 Pat <Pat at junk.net> wrote:

> Terry Reedy wrote:
> > Pat wrote:
> >> Andreas Waldenburger wrote:
> >>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
> >>>
> >>>> Tobiah wrote:
> >>>>> Just out of curiosity, why was len() made to
> >>>>> be it's own function?  I often find myself
> >>>>> typing things like my_list.len before I
> >>>>> catch myself.
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Toby
> >>>> I'm surprised that no one responded to that question.
> >>>>
> >>> Huh? Gabriel Genellina replied about 46 minutes after it was
> >>> posted. Might it be that your newsserver is a bit laggy?
> >>>
> >>> regards
> >>> /W
> >>>
> >>
> >> Might be laggy.  Who knows.
> >>
> >> Why didn't you answer the len() question?
> > 
> > I didn't respond because it has been asked and answered before, so
> > the answer can be found in the google archives or even maybe the
> > FAQ.
> 
> Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?
> 
No, I am. Pretty clear from the "From" header. ;)


> If you didn't feel like answering the question, why did you add an 
> utterly worthless post?
> 
There, there. Let's not get too excited, OK? I made an observation that
I felt might be beneficial to you (even if only marginally so). I did
not mean it as an insult. I'm sorry if it seemed that way.

/W

-- 
My real email address is constructed by swapping the domain with the
recipient (local part).


From steve at holdenweb.com  Sun Feb  8 12:00:52 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 12:00:52 -0500
Subject: len()
In-Reply-To: <20090208174414.4837b34c@usenot.de>
References: <pan.2009.01.27.22.30.29.337999@tobiah.org>
	<gm254n$14l$1@aioe.org>	<20090131201648.201b6ed5@usenot.de>
	<gmc979$b9r$1@aioe.org>	<mailman.8798.1233774905.3487.python-list@python.org>	<gmmkkh$pcf$2@aioe.org>
	<20090208174414.4837b34c@usenot.de>
Message-ID: <gmn34g$k65$1@ger.gmane.org>

Andreas Waldenburger wrote:
> On Sun, 08 Feb 2009 07:54:13 -0500 Pat <Pat at junk.net> wrote:
> 
>> Terry Reedy wrote:
>>> Pat wrote:
>>>> Andreas Waldenburger wrote:
>>>>> On Sat, 31 Jan 2009 13:27:02 -0500 Pat <Pat at junk.net> wrote:
>>>>>
>>>>>> Tobiah wrote:
>>>>>>> Just out of curiosity, why was len() made to
>>>>>>> be it's own function?  I often find myself
>>>>>>> typing things like my_list.len before I
>>>>>>> catch myself.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Toby
>>>>>> I'm surprised that no one responded to that question.
>>>>>>
>>>>> Huh? Gabriel Genellina replied about 46 minutes after it was
>>>>> posted. Might it be that your newsserver is a bit laggy?
>>>>>
>>>>> regards
>>>>> /W
>>>>>
>>>> Might be laggy.  Who knows.
>>>>
>>>> Why didn't you answer the len() question?
>>> I didn't respond because it has been asked and answered before, so
>>> the answer can be found in the google archives or even maybe the
>>> FAQ.
>> Yes, you did respond.  Aren't you the one who wrote "Might be laggy"?
>>
> No, I am. Pretty clear from the "From" header. ;)
> 
> 
>> If you didn't feel like answering the question, why did you add an 
>> utterly worthless post?
>>
> There, there. Let's not get too excited, OK? I made an observation that
> I felt might be beneficial to you (even if only marginally so). I did
> not mean it as an insult. I'm sorry if it seemed that way.

Right, well let's *all* calm down, and resolve not to bother making
posts that don't contribute something positive. It's not like this is a
low-bandwidth group, there's always plenty going on.

regards
 Steve

who is still hoping that one day Xah Lee will post and *nobody* will
reply ...
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cjw at ncf.ca  Sun Feb  8 12:18:32 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sun, 08 Feb 2009 12:18:32 -0500
Subject: easy_install
In-Reply-To: <6v88eaFifbroU1@mid.uni-berlin.de>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
Message-ID: <498F13E8.40501@ncf.ca>

Diez B. Roggisch wrote:
> hall.jeff at gmail.com wrote:
> 
>> For the life of me I can not figure out how to get easy_install to
>> work. The syntax displayed on the web page does not appear to work
>> properly.
>>
>> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
> 
> It usually works for me - so what does "not appear to work properly"
> actually mean?
> 
> Diez

I updated my easy_install, used the 
scripts directory, dropped the "c:\" and 
it gave the response below for me:

C:\Documents and 
Settings\cjw\Desktop>c:\Python25\scripts\easy_install 
  MySQL_python-1.2.2-py2.4-win32.egg
Searching for 
MySQL-python-1.2.2-py2.4-win32.egg
Reading 
http://pypi.python.org/simple/MySQL_python-1.2.2-py2.4-win32.egg/
Reading 
http://pypi.python.org/simple/MySQL-python-1.2.2-py2.4-win32.egg/
Couldn't find index page for 
'MySQL_python-1.2.2-py2.4-win32.egg' 
(maybe misspelled?)
Scanning index of all packages (this may 
take a while)
Reading http://pypi.python.org/simple/
No local packages or download links 
found for MySQL-python-1.2.2-py2.4-win32.egg
error: Could not find suitable 
distribution for 
Requirement.parse('MySQL-python-1.2.2-py2.4-win32.egg')

C:\Documents and Settings\cjw\Desktop>

I hope that this is of some help.

Colin W.


From benjamin.kaplan at case.edu  Sun Feb  8 12:23:24 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 8 Feb 2009 12:23:24 -0500
Subject: easy_install
In-Reply-To: <498F13E8.40501@ncf.ca>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de> <498F13E8.40501@ncf.ca>
Message-ID: <ec96e1390902080923y529eaa4bh98390552d029e0e3@mail.gmail.com>

On Sun, Feb 8, 2009 at 12:18 PM, Colin J. Williams <cjw at ncf.ca> wrote:

> Diez B. Roggisch wrote:
>
>> hall.jeff at gmail.com wrote:
>>
>>  For the life of me I can not figure out how to get easy_install to
>>> work. The syntax displayed on the web page does not appear to work
>>> properly.
>>>
>>> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg
>>>
>>
>> It usually works for me - so what does "not appear to work properly"
>> actually mean?
>>
>> Diez
>>
>
> I updated my easy_install, used the scripts directory, dropped the "c:\"
> and it gave the response below for me:
>
> C:\Documents and Settings\cjw\Desktop>c:\Python25\scripts\easy_install
>  MySQL_python-1.2.2-py2.4-win32.egg
> Searching for MySQL-python-1.2.2-py2.4-win32.egg
> Reading http://pypi.python.org/simple/MySQL_python-1.2.2-py2.4-win32.egg/
> Reading http://pypi.python.org/simple/MySQL-python-1.2.2-py2.4-win32.egg/
> Couldn't find index page for 'MySQL_python-1.2.2-py2.4-win32.egg' (maybe
> misspelled?)
> Scanning index of all packages (this may take a while)
> Reading http://pypi.python.org/simple/
> No local packages or download links found for
> MySQL-python-1.2.2-py2.4-win32.egg
> error: Could not find suitable distribution for
> Requirement.parse('MySQL-python-1.2.2-py2.4-win32.egg')
>
> C:\Documents and Settings\cjw\Desktop>
>
> I hope that this is of some help.


the py2.4 part of the egg implies that it was compiled for Python 2.4. You
are trying to use Python 2.5. Try looking for
MySQL-python-1.2.2-py2.5-win32.egg instead.


>
>
> Colin W.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From gherron at islandtraining.com  Sun Feb  8 12:58:44 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 08 Feb 2009 09:58:44 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
Message-ID: <498F1D54.9010509@islandtraining.com>

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From apt.shansen at gmail.com  Sun Feb  8 13:13:10 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 8 Feb 2009 10:13:10 -0800
Subject: easy_install
In-Reply-To: <498F13E8.40501@ncf.ca>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de> <498F13E8.40501@ncf.ca>
Message-ID: <7a9c25c20902081013l74b7c839u3c6f8b839ad6b463@mail.gmail.com>

> I updated my easy_install, used the scripts directory, dropped the "c:\" and
> it gave the response below for me:

That's kinda apples to oranges to what the OP's problem is.

The OP appears to be trying to install an egg he downloaded
previously. You're instructing easy_install (by dropping the c:\) to
search PyPi for an egg that isn't provided. The problem you're having
is that it can't find on the internet any packages that match that
name (because if you wanted it to find something on the internet,
you'd say "easy_install MySQL_python").

--S


From martin at v.loewis.de  Sun Feb  8 13:30:58 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 19:30:58 +0100
Subject: sortable table in python 3.0
In-Reply-To: <HPqjl.10476$Db2.10474@edtnps83>
References: <HPqjl.10476$Db2.10474@edtnps83>
Message-ID: <498f24e2$0$3368$9b622d9e@news.freenet.de>

Peter Pei wrote:
> In one of my program, I used something called MultiColumnList, which is
> one of the sortable table widgets done in python. However 3.0 sort is
> different. I googled and found couple of other implementations, but all
> in python 3.0 -.
> 
> Does anyone know any solution in 3.0? or anything that has already been
> upgraded to 3.0? Thanks.

You need to use the key= argument to sort.

Martin


From seaworthyjeremy at gmail.com  Sun Feb  8 13:42:02 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sun, 8 Feb 2009 10:42:02 -0800 (PST)
Subject: Python Module: nift
Message-ID: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>

What are your thoughts on this module I created?

'''
    A Python Module created by a High School Student.
           Includes rev(), reet(), and leet().

                    Import nift

    Function:       nift.rev()
    Description:    Reverses a string
    Usage:          nift.rev('string')
    Example:        nift.rev('Testing function.')
    Output:         '.noitcnuf gnitseT'

    Function:       nift.reet()
    Description:    Reverses a string
                    and transforms to leet text.
    Usage:          nift.reet('string')
    Example:        nift.reet('Hello World!')
    Output:         'dlr0W 0ll3H'

    Function:       nift.leet()
    Description:    Transforms a string
                    into leet text.
    Usage:          nift.leet('string')
    Example:        nift.leet('Hello there!')
    Output:         'H3ll0 7h3r3!'

    Setup:
                    * Save to Python Directory\Lib\ as nift.py
                    * Now you may import it by:
                        from nift import function
                        function()
                                    OR
                        import nift
                        nift.function()

    * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
    * This Module and its functions were created for my own fun, also
*
    * contributing to Inter-Society. I don't mind if anyone modifies
*
    *  this module or adds on to it, as long as you attribute it to
*
    *                           Myself.
*
    * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
'''

def rev(string):
    list = []
    final = ''
    for letters in string:
        list.append(letters)
    list.reverse()
    for letters in list:
        final = final + letters
    return final

def reet(string):
    list = []
    final = ''
    for letters in string:
        list.append(letters)
    list.reverse()
    for letters in list:
        if letters == 'e' or letters == 'E':
            letters = '3'
        elif letters == 'a' or letters == 'A':
            letters = '4'
        elif letters == 'i' or letters == 'I':
            letters = '1'
        elif letters == 't' or letters == 'T':
            letters = '7'
        elif letters == 's' or letters == 'S':
            letters = '5'
        elif letters == 'o' or letters == 'O':
            letters = '0'
        elif letters == 'b' or letters == 'B':
            letters = '8'
        final = final + letters
    return final

def leet(string):
    list = []
    final = ''
    for letters in string:
        if letters == 'e' or letters == 'E':
            letters = '3'
        elif letters == 'a' or letters == 'A':
            letters = '4'
        elif letters == 'i' or letters == 'I':
            letters = '1'
        elif letters == 't' or letters == 'T':
            letters = '7'
        elif letters == 's' or letters == 'S':
            letters = '5'
        elif letters == 'o' or letters == 'O':
            letters = '0'
        elif letters == 'b' or letters == 'B':
            letters = '8'
        list.append(letters)
    for letters in list:
        final = final + letters
    return final


From martin at v.loewis.de  Sun Feb  8 13:43:01 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sun, 08 Feb 2009 19:43:01 +0100
Subject: easy_install
In-Reply-To: <mailman.9097.1234116794.3487.python-list@python.org>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>	<6v88eaFifbroU1@mid.uni-berlin.de>
	<498F13E8.40501@ncf.ca>
	<mailman.9097.1234116794.3487.python-list@python.org>
Message-ID: <498f27b6$0$28732$9b622d9e@news.freenet.de>

> That's kinda apples to oranges to what the OP's problem is.
> 
> The OP appears to be trying to install an egg he downloaded
> previously.

I think he actually didn't - if you read his messages, nowhere
he said that he actually downloaded the file, and that it actually
exists in the root directory of c:

Regards,
Martin


From martin at v.loewis.de  Sun Feb  8 13:45:47 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 19:45:47 +0100
Subject: easy_install
In-Reply-To: <4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
Message-ID: <498F285B.6060905@v.loewis.de>

> http://peak.telecommunity.com/DevCenter/EasyInstall#downloading-and-installing-a-package
> 
> seems to imply that after installation I can goto a command prompt and
> type
> 
> easy_install c:\MySQL_python-1.2.2-py2.4-win32.egg

These instructions must have misled you. This command only works if you
actually have a file c:\MySQL_python-1.2.2-py2.4-win32.egg on your disk,
e.g. after downloading it, from

http://pypi.python.org/pypi/MySQL-python/1.2.2

If you haven't downloaded it, you have two choices

1. download it, and then give the full filename to easy_install
   (*not* c:\MySQL_python-1.2.2-py2.4-win32.egg, unless you download
   to c:\)

2. ask easy_install to download first, with

   easy_install MySQL-python

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 13:48:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 16:48:24 -0200
Subject: Lists implemented as integer-hashed Dictionaries?
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <op.uo1qiybbx6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 01:18:37 -0200, er <erobererunc at gmail.com> escribi?:

> Somebody much more intelligent than I said today that someone told him  
> that Python lists are just dictionaries with lists hashed by integers.

In addition to all other responses you received, I'd add that lists and  
dictionaries share the same syntax a[x] and the same magic methods in  
Python code (__getitem__, __setitem__, __delitem__). But the similarity  
stops here. The CPython implementation has two different sets of methods,  
one for sequences and other for mappings, so when you override e.g.  
__getitem__ in Python code it replaces either sq_item or mp_subscript  
depending on which one is defined.

Other implementations might choose to do different, but at least on  
standard PC hardware I can't imagine how to efficiently implement lists as  
dictionaries...

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 13:48:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 16:48:24 -0200
Subject: Lists implemented as integer-hashed Dictionaries?
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <op.uo1qiyx7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 01:18:37 -0200, er <erobererunc at gmail.com> escribi?:

> Somebody much more intelligent than I said today that someone told him  
> that Python lists are just dictionaries with lists hashed by integers.

In addition to all other responses you received, I'd add that lists and  
dictionaries share the same syntax a[x] and the same magic methods in  
Python code (__getitem__, __setitem__, __delitem__). But the similarity  
stops here. The CPython implementation has two different sets of methods,  
one for sequences and other for mappings, so when you override e.g.  
__getitem__ in Python code it replaces either sq_item or mp_subscript  
depending on which one is defined.

Other implementations might choose to do different, but at least on  
standard PC hardware I can't imagine how to efficiently implement lists as  
dictionaries...

-- 
Gabriel Genellina



From clp2 at rebertia.com  Sun Feb  8 13:53:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 10:53:57 -0800
Subject: Python Module: nift
In-Reply-To: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <50697b2c0902081053n492696f3n40f5896ced42db66@mail.gmail.com>

On Sun, Feb 8, 2009 at 10:42 AM, J <seaworthyjeremy at gmail.com> wrote:
> What are your thoughts on this module I created?

* You should probably use individual docstrings for each function
rather than one giant module docstring
* Don't use 'list' as a variable name; it shadows the name of the
builtin list type
* You can use the .lower() or .upper() method of strings to get rid of
half the 'or'-s in leet() and reet(). Better yet, use a dict rather
than a long if-elif chain.
* To convert a list of strings to a single string, use
''.join(the_list) instead of:
final = ''
for letters in the_list:
    final = final + letters #also, += is preferred in cases like this
* To convert a string to a list of characters, use list(string) instead of:
the_list = []
final = ''
for letters in string:
    the_list.append(letters)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From Scott.Daniels at Acm.Org  Sun Feb  8 14:07:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 08 Feb 2009 11:07:46 -0800
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
Message-ID: <JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>

chohazel at gmail.com wrote:
> Hi,
> Is there a way to adjust the default font size in IDLE, in MacPython
> 2.5? The default now is too tiny.
> I have to use this version of MacPython. As far as I searched, I can't
> find how I do this.
> Thanks.

If you can read what you have at all, try to go toHelp (on the top),
then down in that menu to "Configure IDLE ..."
There will be a possibly long delay.  Then on the tab in the produced
window, You can set the Base Editor Font and Size.  I use Tahoma 14.
Then go click "Ok".  If the display doesn't get better, you might have
to exit from Idle and restart it.  If this diesn't work, get back to me
and we can try something more drastic.

--Scott David Daniels
Scott.Daniels at Acm.Org



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 14:09:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 17:09:51 -0200
Subject: How to copy an instance without its cStringIO.StringO item ?
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68779F@enbmail01.lsi.com>
Message-ID: <op.uo1ripp8x6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 14:17:34 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

> I need to copy an instance of a class, where one of the items in the  
> original is a cStringIO.StringO object.
> I do not need the cStringIO.StringO in the target object.
> The target instance is to be pickled.
> [...]
>             for_pickle_log_stream = LogStream(sac_log_file)
>             for key in log_stream.__dict__:
>                 if key != "input_file":
>                     for_pickle_log_stream[key] = log_stream[key]

Note that you're iterating over __dict__ keys, but the last line does not  
use __dict__. Either put __dict__ everywhere, or:
     setattr(for_pickle_log_stream, key, getattr(log_stream, key))

But if you want this copy just to pickle it, follow Christian Heimes  
advice and define __getstate__ / __setstate__.

-- 
Gabriel Genellina



From lists at cheimes.de  Sun Feb  8 14:33:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 20:33:35 +0100
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>
Message-ID: <gmnc2f$e6l$1@ger.gmane.org>

er schrieb:
> Somebody much more intelligent than I said today that someone told him that
> Python lists are just dictionaries with lists hashed by integers.  Since he
> said that someone else told him this, I piped up and said that I thought
> that wasn't true.  I looked at the source code for lists in python, and I
> did not expressly remember seeing dictionaries.  Unfortunately I am not
> somewhere where I can easily look at the code right now (I'm logged into
> Windows!), and I might not realize exactly what I'm looking at anyways, but
> I'd like to extend an apology to the guy soon if I was wrong.  So, can
> anyone tell me if lists are really just dictionaries?  Thanks!

I like to add some technical information to the topic.

In CPython (the most common implementation of Python in C89) lists are
implemented as arrays of PyObject* pointers with a non linear growth
rate. They are neither implemented as linked lists or as hash maps.

The array based implementation makes the most common operations as fast
as possible: creation of a list with a known size of elements,
iteration, item access, appending and popping from the tail of a list.
Iteration and item access (somelist[1]) is a O(1) op.
The internal array grows non linear and is usually over-allocated. This
makes appending to the end faster because the array doesn't need to be
copied with every append().

Uncommon operations like inserts at the head of the lists are slower and
require more memcopy ops. CPython has a deque implementation in the
collections module with is optimized for both changing both ends of a
list like object.

Christian



From lists at cheimes.de  Sun Feb  8 14:38:25 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 08 Feb 2009 20:38:25 +0100
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>
	<7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
Message-ID: <gmncbh$eui$1@ger.gmane.org>

Stephen Hansen schrieb:
> Now, I believe Python sets *are* for all intents and purposes
> dictionaries, but I think that's just because its the easiest and most
> efficient way to implement their uniqueness properties; they took the
> very-well-tuned dictionary implementation and cut out the stuff not
> needed by sets and did some tweaks here or there. I /believe/.

You are correct. The first set implementation in pure Python was using a
dict as internal storage. The new set implementation is heavily based on
the highly optimized dict code. Sets are basically dicts without values.

from Objects/setobject.c

   set object implementation
   Written and maintained by Raymond D. Hettinger <python at rcn.com>
   Derived from Lib/sets.py and Objects/dictobject.c.



From bearophileHUGS at lycos.com  Sun Feb  8 14:59:41 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 11:59:41 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
Message-ID: <1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>

More suggestions for a real-world Python programmer:
- There's code duplication, the original poster may express reet as a
composition of the other functions.
- A Python string/list/array can be inverted with [::-1]
- I suggest to convert the examples of the main doscstring into
doctests.
- The main docstring looks too much heavy.
- To convert many ASCII chars there's the str.translate method.
- Generally I suggest to learn to code in the small, using as little
code as possible.

Bye,
bearophile


From david.birdsong at gmail.com  Sun Feb  8 15:07:08 2009
From: david.birdsong at gmail.com (birdsong)
Date: Sun, 8 Feb 2009 12:07:08 -0800 (PST)
Subject: "Weird" Indentation? (Or: is there a for...else construct?)
References: <20090207152122.683de28e@usenot.de>
	<019d9052$0$20640$c3e8da3@news.astraweb.com> 
	<20090207153459.123c5706@usenot.de>
Message-ID: <568da34b-0602-44d5-b5d3-496b3cd096cc@r15g2000prd.googlegroups.com>

On Feb 7, 6:34?am, Andreas Waldenburger <geekm... at usenot.de> wrote:
> On Sun, 08 Feb 2009 01:28:00 +1100 Steven D'Aprano
>
> <st... at pearwood.info> wrote:
> > Andreas Waldenburger wrote:
>
> > > It seems that there is a for...else construct. Replacing the inner
> > > if with pass seems to confirm this. The else clause is still
> > > executed.
>
> > Yes, there is a for...else construct.
>
> That's something. In 6+ years of Python programming I've never seen or
> heard of this thing. This might be useful, apparently.
>
yeah, about 4 years for me and i've never noticed this feature.

> > [snip]
>
> > > What's broken here: Python or my brain?
>
> > Perhaps we should not answer that question.
>
> I did phrase that rather provocatively, didn't I?
>
> Well thanks. I'll try to learn less noisily in the future. :)
>
> /W
>
> --
> My real email address is constructed by swapping the domain with the
> recipient (local part).



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:25:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:25:53 -0200
Subject: Path question
References: <mailman.8716.1233686855.3487.python-list@python.org>
	<6urjrhFgvif8U1@mid.uni-berlin.de> <498ECB0C.5050705@gmail.com>
Message-ID: <op.uo1u1fpnx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 10:07:40 -0200, Geert Vancompernolle  
<geert.discussions at gmail.com> escribi?:

> Diez B. Roggisch wrote:
>> Geert Vancompernolle schrieb:
>>> Hi,
>>>
>>> I have the following path construction:
>>>
>>> ./src/__init__.py
>>>     /main.py
>>>     /modules/__init__.py
>>>             /application.py
>>>     /ui/__init__.py
>>>        /mainwindow/__init__.py
>>>                   /mainwindow.py
>>>
>>> Now I want to call the method 'MainWindow' in the module 'mainwindow',  
>>> from the module 'application'.
>>>
>>> I'm having the following import statement in 'applications.py':
>>>
>>> from .. ui.mainwindow.mainwindow import MainWindow
>>>
>>> That doesn't work.  I've also tried many other combinations like from  
>>> ..ui.mainwindow...  but none of them work.
>>>
>>> I always get the following error:
>>>
>>> "Attempted relative import beyond toplevel package"
>>>
>>> How can I import the method 'MainWindow' from 'mainwindow' into  
>>> 'application', using the explicit relative import rules?
>>>
>>> Or is there a better way to do this?
>>>
>>
>> Rename "src" to "myapp", and start main.py from above that. That should  
>> work.
>>
>>
>>
>> Diez
>> -- http://mail.python.org/mailman/listinfo/python-list
>>
> That trick did it, thanks!
>
> But I have one more unclarity about relative import rules.  Here  
> <http://docs.python.org/tutorial/modules.html?highlight=modules>, one  
> can find an explanation about modules in the official Python 2.6.1  
> documentation.
>
> In that article, there's an example of importing relative packages (in  
> the section "Packages").
>
> I see the following examples:
>
> from . import echo
> from .. import formats
> from ..filters import equalizer
>
>
> Applying that mechanism on my application, I'm using the following  
> construction (see my initial email):
>
> "from .. ui.mainwindow.mainwindow import MainWindow"
>
> But using "from ..ui.mainwindow.mainwindow import MainWindow" seems to  
> be giving exactly the same result (mind the lacking space between ".."  
> and "ui").
>
> So, what's the difference (if there is one) between "from ..  
> ui.mainwin..." and "from ..ui.mainwin..." (again, mind the difference in  
> space)?

There is none. It's the same as:

 from .    . ui  .mainwindow.  mainwindow      import     mainWindow

Whitespace is irrelevant here. The quoted examples mean:

> from . import echo
import the "echo" module/package from the current package

> from .. import formats
import the "formats" module/package from one level above the current  
package (if it is a package, it's a sibling directory; if it's a module,  
it's in the parent directory).

> from ..filters import equalizer
import only the name "equalizer" from the "filters" module/package,  
located one level above the current package (same note as previous)

> I guess there's a difference, otherwise it would not be given as an  
> example in the Python documentation.

Note that examples 1 and 2 don't have any name in the "from" part; they're  
like a plain "import echo" or "import formats" (but telling also *where*  
to search for them, so it's not the same thing). The target is a  
module/package, as with a plain "import foo".

The third example only imports a name from another place (filters), also  
telling where to search for the module/package.

When you eventually grasp the concept (and I'm sure you will), could you  
think of a better wording/examples to improve the documentation? (I cannot  
see the deficiencies, just because I *already* know what it means!)

-- 
Gabriel Genellina



From nick at stinemates.org  Sun Feb  8 15:33:06 2009
From: nick at stinemates.org (nick at stinemates.org)
Date: Sun, 8 Feb 2009 12:33:06 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <20090208203306.GA578@beauTy.hsd1.ca.comcast.net>

Gary

Your email client is set to HTML mode and looks terrible for those of us
who prefer plain view. It also appears your client is not properly
sending your message in  text/plain encoding.




From python-list at davidkra.net  Sun Feb  8 15:38:22 2009
From: python-list at davidkra.net (David Kraeutmann)
Date: Sun, 08 Feb 2009 21:38:22 +0100
Subject: Extracting bytecode out of frozen programs
Message-ID: <498F42BE.4060608@davidkra.net>

Hello,
I need to extract the modules/packages out of a frozen script. It was
compiled using Python 2.2.3 and the standard freeze.py.
I managed to get a shell after execution using PYTHONINSPECT=y and find
the start of a module/package using a hex editor (I got the sta, but
these modules don't seem to be importable.
Is there a way of extracting them so they are importable in a python shell?

Regards,
David Kraeutmann


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:40:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:40:21 -0200
Subject: py2exe and distutils
References: <gmk5o8$g34$00$1@news.t-online.com>
	<6v69nnFi8bmqU1@mid.individual.net> <6v69rkFi8bmqU2@mid.individual.net>
Message-ID: <op.uo1vpjdlx6zn5v@gabriel.sleipnir-bsas>

En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net>  
escribi?:

>> Maxim Demenko schrieb:
>>> Hi,
>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe  
>>> 0.6.9
>>> Now i can't list installed modules, here is the stacktrace:
> [...]
>>> Any suggestion, how to fix this issue?
>>
> Thomas Heller schrieb:
>> Looks like a setuptools problem to me.  Here's the output on my system:
>
> Actually, I don't know where the problem is.  Maybe pydoc?

Yes, pydoc isn't robust enough in 2.5; see  
<http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788>  
for a quick fix.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 15:55:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 18:55:13 -0200
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
Message-ID: <op.uo1webxbx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 17:59:41 -0200, <bearophileHUGS at lycos.com> escribi?:

> More suggestions for a real-world Python programmer:
> - There's code duplication, the original poster may express reet as a
> composition of the other functions.
> - A Python string/list/array can be inverted with [::-1]
> - I suggest to convert the examples of the main doscstring into
> doctests.
> - The main docstring looks too much heavy.
> - To convert many ASCII chars there's the str.translate method.
> - Generally I suggest to learn to code in the small, using as little
> code as possible.

I completely agree with all the above suggestions, except this last one.  
Ok, I think I know what you mean, but a beginner might understand this  
completely wrong. Readability is important, and trying to compress too  
much code into one single line should not be the ultimate goal.

-- 
Gabriel Genellina



From ptmcg at austin.rr.com  Sun Feb  8 15:57:39 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 8 Feb 2009 12:57:39 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>

On Feb 8, 12:42?pm, J <seaworthyjer... at gmail.com> wrote:
> What are your thoughts on this module I created?
>
Here are a few steps to illustrate some good basic Python idioms worth
learning:

Step 1: Replace many-branched if-elif with dict

While translating characters in a string is a special case that
usually warrants using str.translate, a more general-purpose technique
to learn is to define a dict that captures the various branching
options, and then use the selecting value as a key to access the
desired branch.
Here is a dict containing your branches:

LEET_LETTERS = {
    "e" : "3",
    "E" : "3",
    "a" : "4",
    "A" : "4",
    "i" : "1",
    "I" : "1",
    "t" : "7",
    "T" : "7",
    "s" : "5",
    "S" : "5",
    "o" : "0",
    "O" : "0",
    "b" : "8",
    "B" : "8",
    }

Now you can implement leet() using access to the LEET_LETTERS
mapping.  Here are 3 different versions, that illustrate the usual
options when accessing entries from a map:
1. Look before you leet, uh, I mean "leap" (check for key existence
before using)
2. Better to ask forgiveness than permission (just use the key and
handle the exception that gets raised if the key is not found - an
homage to Grace Hopper)
3. Slightly different strategy, using dict.get() method instead of key/
indexing into the dict

def leet1(string):
    outlist = []
    for letter in string:
        if letter in LEET_LETTERS:
            letter = LEET_LETTERS[letter]
        outlist.append(letter)
    return "".join(outlist)

def leet2(string):
    outlist = []
    for letter in string:
        try:
            letter = LEET_LETTERS[letter]
        except KeyError:
            pass
        outlist.append(letter)
    return "".join(outlist)

def leet3(string):
    outlist = []
    for letter in string:
        outlist.append( LEET_LETTERS.get(letter,letter) )
    return "".join(outlist)

You can test each in turn without changing your test code, just assign
leet to each of these variants in turn:

leet = leet1
print leet("Hello You Beautiful Sweet World!")

I'm partial to option number 3, so let me show you a few other helpful
tips.

By the way, you can do this if you are doing any kind if if-elif, such
as:

if a=="0":
    fn_1()
elif a=="1":
    fn_100()
elif a=="7":
    fn_greater_than_five()
...

Instead you would write:

# note: values are the methods only, no ()'s
fns = { "0" : fn_1, "1" : fn_100, "7" : fn_greater_than_five }
if a in fns:
    # get desired function from fns map, and call it
    fns[a]()


Step 2: dict construction instead of {} syntax

LEET_LETTERS is so space-consuming, sometimes it is easier to use the
dict constructor with a list expression of list comprehension.  That
is, instead of the built-in syntax P{}'s to define a dict, you can use
the dict constructor and pass a list of (key,value) tuples.

LEET_LETTERS = dict( [("E","3"), ("e","3"), ("A","4"),
("a","4"), ...] )

Well, my fingers are tired and I'm bored already, how about if we
could just list the two strings of key and value characters, and some
how build the tuples by pulling an item from each list one at a time.
Fortunately, that is what Python's zip() function does:

LEET_LETTERS = dict( zip("eEaAiItTsSoObB",
                         "33441177550088") )

(I've listed the key-value pairs one above the other to illustrate how
the mapping will work, but of course, that isn't required.)

Now if I want to add another leet-speak letter (like "6" for "G"), I
just add the two characters on the end of the two strings.


Step 3: Use list comprehension instead of explicit list.appends using
for loop

As was already mentioned in another post, ''.join
(list_of_characters_to_join_together) is preferred to final +=
next_letter_to_add_to_final.  But there is also a nice short and clean
way to build up the list besides explicitly calling append in a loop.
Instead, use a list comprehension.  To do this, you convert:

    outlist = []
    for letter in string:
        outlist.append( LEET_LETTERS.get(letter,letter) )

to:
    outlist = [ LEET_LETTERS.get(letter,letter) for letter in string ]


In fact, Python is so smart, you can skip the list entirely, and just
pass that expression inside the brackets (called a generator
expression) directly to ''.join:

    final = ''.join( LEET_LETTERS.get(letter,letter) for letter in
string )

Just a "list" is not desired variable name since it masks the built-in
list type, I avoid "string" as a name since there is a commonly-used
string module.  How about just plain "s"?

Here is the final version of leet - we even got rid of the variable
final, and just return the value that would have been assigned to it:

LEET_LETTERS = dict( zip("eEaAiItTsSoObB", "33441177550088") )
def leet(s):
    return ''.join( LEET_LETTERS.get(c,c) for c in s )

Soon you'll be writing Python just like all the cool kids!

-- Paul


From blue.indigo at uatel.com.nospam.bogus.invalid.invalid.invalid  Sun Feb  8 16:02:37 2009
From: blue.indigo at uatel.com.nospam.bogus.invalid.invalid.invalid (blue indigo)
Date: Sun, 08 Feb 2009 16:02:37 -0500
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
	<6v2sf4Fhuh4mU1@mid.individual.net>
Message-ID: <pan.2009.02.08.21.02.37.336625@uatel.com.nospam.bogus.invalid.invalid.invalid>

On Fri, 06 Feb 2009 14:32:21 +0100, Pascal Costanza wrote:

> Xah Lee wrote:
>> Pascal Constanza is a Common Lisp fanatic.
> 
> It's Costanza, not Constanza.
> 
> 
> Thank you,
> Pascal

         +-------------------+             .:\:\:/:/:.            
         |   PLEASE DO NOT   |            :.:\:\:/:/:.:           
         |  FEED THE TROLLS  |           :=.' -   - '.=:          
         |                   |           '=(\ 9   9 /)='          
         |   Thank you,      |              (  (_)  )             
         |       Management  |              /`-vvv-'\             
         +-------------------+             /         \            
                 |  |        @@@          / /|,,,,,|\ \           
                 |  |        @@@         /_//  /^\  \\_\          
   @x@@x@        |  |         |/         WW(  (   )  )WW          
   \||||/        |  |        \|           __\,,\ /,,/__           
    \||/         |  |         |          (______Y______)          
/\/\/\/\/\/\/\/\//\/\\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
==================================================================

(f'up set to comp.lang.lisp)

-- 
blue indigo
UA Telecom since 1987


From sjmachin at lexicon.net  Sun Feb  8 16:03:52 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 8 Feb 2009 13:03:52 -0800 (PST)
Subject: How to copy an instance without its cStringIO.StringO item ?
References: <mailman.41126.1234094855.3486.python-list@python.org> 
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com> 
	<mailman.9087.1234101684.3487.python-list@python.org>
Message-ID: <ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>

On Feb 9, 1:01?am, Christian Heimes <li... at cheimes.de> wrote:
> Barak, Ron schrieb:
>
> > Hi,
>
> > I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> > I do not need the cStringIO.StringO in the target object.
> > The target instance is to be pickled.
>
> > Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
>
> > However, trying to use copy.deepcopy produced: TypeError: object.__new__(cStringIO.StringO) is not safe, use cStringIO.StringO.__new__()
>
> > Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
>
> > If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
>
> > Can you suggest a better way ?
>
> You can overwrite some functions in order to omit attributes from a
> pickle. It's all documented athttp://docs.python.org/library/pickle.html#pickling-and-unpickling-no...

If there is no chance that some other thread could be accessing the
source object, can't the OP just do:
    temp = source.stringio
    del source.stringio
    # make a pickle from source
    source.stringio = temp
?





From gagsl-py2 at yahoo.com.ar  Sun Feb  8 16:14:08 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 19:14:08 -0200
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
	<fb2218ba0902080110g2ee04900we1dd1515ac30040d@mail.gmail.com>
Message-ID: <op.uo1w9uyex6zn5v@gabriel.sleipnir-bsas>

On Sun, Feb 8, 2009 at 9:12 AM, Terry <terry.yinzhe at gmail.com> wrote:

>> I have made the same analysis to some commercial source code, the
>> dup60 rate is quite often significantly larger than 15%.

En Sun, 08 Feb 2009 07:10:12 -0200, Henry Read <henryar2 at gmail.com>  
escribi?:

> I don't think code duplication rate has strong relationship towards code
> quality.

Not directly; but large chunks of identical code repeated in many places  
aren't a good sign. I'd question myself if all of them are equally tested?  
What if someone fixes a bug - will the change be propagated everywhere?  
Should the code be refactored?


-- 
Gabriel Genellina



From martin at v.loewis.de  Sun Feb  8 16:19:12 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 08 Feb 2009 22:19:12 +0100
Subject: Extracting bytecode out of frozen programs
In-Reply-To: <mailman.9106.1234126502.3487.python-list@python.org>
References: <mailman.9106.1234126502.3487.python-list@python.org>
Message-ID: <498f4c50$0$30899$9b622d9e@news.freenet.de>

> Is there a way of extracting them so they are importable in a python shell?

Try imp.get_frozen_object.

Regards,
Martin


From bearophileHUGS at lycos.com  Sun Feb  8 16:24:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 13:24:42 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <f2a74f06-b1e6-40e0-a61c-f9a8418eac5f@w34g2000yqm.googlegroups.com>

Paul McGuire:
> LEET_LETTERS = dict( zip("eEaAiItTsSoObB", "33441177550088") )
> def leet(s):
> ? ? return ''.join( LEET_LETTERS.get(c,c) for c in s )

This may be better:

from string import maketrans

def leet(txt):
    leet_chars = maketrans("eEaAiItTsSoObB", "33441177550088")
    return txt.translate(leet_chars)

Moving leet_chars outside the function increases speed a bit.

Or for more expert Python programmers, you can add an attribute the
object function, I don't know if you like this:

from string import maketrans

def leet(txt):
    return txt.translate(leet.chars)
leet.chars = maketrans("eEaAiItTsSoObB", "33441177550088")

It's executes maketrans once only and keeps the namespace tidy. So
it's a bit like a static variable in other languages.

Bye,
bearophile


From clp2 at rebertia.com  Sun Feb  8 16:28:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 13:28:55 -0800
Subject: Python Module: nift
In-Reply-To: <a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902081328m143f6e45l8c6425022ed2b9bc@mail.gmail.com>

On Sun, Feb 8, 2009 at 12:57 PM, Paul McGuire <ptmcg at austin.rr.com> wrote:
> On Feb 8, 12:42 pm, J <seaworthyjer... at gmail.com> wrote:
>> What are your thoughts on this module I created?
>>
> Here are a few steps to illustrate some good basic Python idioms worth
> learning:
>
> Step 1: Replace many-branched if-elif with dict
>
> While translating characters in a string is a special case that
> usually warrants using str.translate, a more general-purpose technique
> to learn is to define a dict that captures the various branching
> options, and then use the selecting value as a key to access the
> desired branch.
> Here is a dict containing your branches:
>
> LEET_LETTERS = {
>    "e" : "3",
>    "E" : "3",
>    "a" : "4",
>    "A" : "4",
>    "i" : "1",
>    "I" : "1",
>    "t" : "7",
>    "T" : "7",
>    "s" : "5",
>    "S" : "5",
>    "o" : "0",
>    "O" : "0",
>    "b" : "8",
>    "B" : "8",
>    }
<snip>
> LEET_LETTERS is so space-consuming, sometimes it is easier to use the
> dict constructor with a list expression of list comprehension.  That
> is, instead of the built-in syntax P{}'s to define a dict, you can use
> the dict constructor and pass a list of (key,value) tuples.
>
> LEET_LETTERS = dict( [("E","3"), ("e","3"), ("A","4"),
> ("a","4"), ...] )
>
> Well, my fingers are tired and I'm bored already, how about if we
> could just list the two strings of key and value characters, and some
> how build the tuples by pulling an item from each list one at a time.
> Fortunately, that is what Python's zip() function does:
>
> LEET_LETTERS = dict( zip("eEaAiItTsSoObB",
>                         "33441177550088") )
>
> (I've listed the key-value pairs one above the other to illustrate how
> the mapping will work, but of course, that isn't required.)
>
> Now if I want to add another leet-speak letter (like "6" for "G"), I
> just add the two characters on the end of the two strings.

This I disagree with as being unnecessarily clever; the dict literal
is just fine as-is and the zip() makes it less clear. However, I would
definitely rewrite the dict to use less lines, which, after removing
the capital dupes (as I mentioned in my post, just use .lower()),
looks like:

LEET_LETTERS = {"e" : "3", "a" : "4", "i" : "1", "t" : "7", "s" : "5",
    "o" : "0", "b" : "8"}

which is better, IMHO.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From REMpeteOVE at CAPpetezilla.ITALSco.uk  Sun Feb  8 16:32:53 2009
From: REMpeteOVE at CAPpetezilla.ITALSco.uk (Peter Chant)
Date: Sun, 08 Feb 2009 21:32:53 +0000
Subject: Newbie SWMixer / numpy help - AssertionError
References: <pej066x0mc.ln2@phoenix.fire>
	<mailman.9066.1234046887.3487.python-list@python.org>
Message-ID: <5lv366x8tf.ln2@phoenix.fire>

Robert Kern wrote:

> 
>    snd = swmixer.Sound(data=tone_data)
> 
> Well, sort of. You probably need to scale your data and convert it to
> int16 format. It's currently in floating point format.

Done and working, thanks.  As "file" was not needed for file="test.wav" I
assumed the data prefix for data was not essential.

> 
> When asking about why something fails, it helps a lot if you specify
> exactly how it fails and what you expected to happen. Copy-and-paste any
> error messages exactly.

OK

> 
> If you need more help with SWMixer's API, I recommend asking the author.
> It's not in widespread use, so he can probably give you better and faster
> help than we can.
> 
> If you need more help with numpy, specifically, you can ask on the
> numpy-discussion mailing list. numpy *is* in widespread use, but there's a
> higher concentration of helpful numpy users over there.
> 
>    http://www.scipy.org/Mailing_Lists
> 

Most useful response, thanks.

Pete

-- 
http://www.petezilla.co.uk


From bearophileHUGS at lycos.com  Sun Feb  8 16:34:50 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Sun, 8 Feb 2009 13:34:50 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
Message-ID: <838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>

Gabriel Genellina:
> bearophile:
> > - Generally I suggest to learn to code in the small, using as little
> > code as possible.
>
> I completely agree with all the above suggestions, except this last one. ?
> Ok, I think I know what you mean, but a beginner might understand this ?
> completely wrong. Readability is important, and trying to compress too ?
> much code into one single line should not be the ultimate goal.

What I meant is to use less code as possible, keeping readability and
the original flexibility.

I can't stress enough the importance of writing less code. Every new
programmer has to learn how much important it is. Less code means less
bugs, less lines to edit and debug, etc. Less code is usually more
elegant, and often more readable (even if you take 3 times to read
each line it may be good anyway if you have 1/10 of the lines of code.
Recently in the "Java to Python" thread someone has posted some Java
class that is scary, you can probably write the same thing in
1/10-1/20 of the lines of code).

The sense for "elegance" in coding is of course (as in every other
human activity) something you learn after many years of exercise, it's
a matter of balance among many opposite things, a matter of
compromises, and it's also tight related with your personal style of
coding. Every programmer develops tastes and and one or more styles,
that other people may not appreciate much.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Sun Feb  8 16:43:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 19:43:56 -0200
Subject: Extracting bytecode out of frozen programs
References: <498F42BE.4060608@davidkra.net>
Message-ID: <op.uo1ynipfx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 18:38:22 -0200, David Kraeutmann  
<python-list at davidkra.net> escribi?:

> Hello,
> I need to extract the modules/packages out of a frozen script. It was
> compiled using Python 2.2.3 and the standard freeze.py.
> I managed to get a shell after execution using PYTHONINSPECT=y and find
> the start of a module/package using a hex editor (I got the sta, but
> these modules don't seem to be importable.
> Is there a way of extracting them so they are importable in a python  
> shell?

Those modules are exposed via the PyImport_FrozenModules array.
The ctypes documentation has an example for accessing this array, see
http://docs.python.org/library/ctypes#accessing-values-exported-from-dlls


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sun Feb  8 17:12:44 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 08 Feb 2009 20:12:44 -0200
Subject: Extracting bytecode out of frozen programs
References: <mailman.9106.1234126502.3487.python-list@python.org>
	<498f4c50$0$30899$9b622d9e@news.freenet.de>
Message-ID: <op.uo1zzibmx6zn5v@gabriel.sleipnir-bsas>

En Sun, 08 Feb 2009 19:19:12 -0200, Martin v. L?wis <martin at v.loewis.de>  
escribi?:

>> Is there a way of extracting them so they are importable in a python  
>> shell?
>
> Try imp.get_frozen_object.

Ouch... this looks better than using ctypes.
get_frozen_object exists at least since 1.5.2, but has never been  
documented, and the source code says it's obsolete. Should be documented  
now? Any alternative?

-- 
Gabriel Genellina



From vitaliyy at gmail.com  Sun Feb  8 17:32:13 2009
From: vitaliyy at gmail.com (Vitaliy Yermolenko)
Date: Mon, 9 Feb 2009 00:32:13 +0200
Subject: Python on TV-centric platforms
Message-ID: <ccbb236e0902081432k3abf395bued3c18cfab9dfe50@mail.gmail.com>

Hi,

Thanks for thoughts.

As I can see considering Yahoo Widgets (based on
HTML/JavaScript/Flash), XML, AJAX and JavaScript (i. e. web
components) on Figure 1 of
http://www.intelconsumerelectronics.com/Consumer-Electronics-3.0/Widget-Channel-Overview.aspx,
it seems, like Pyjamas is more close for Widget Channel integration,
than XBMC Media Center.

Another question is whether Framework API will be available for
Python, and how deployment will be done?

>On Feb 8, 9:23 am, Vitaliy Yermolenko <vital... at gmail.com> wrote:
>> Any chance to see Python to be ready for "Widget Development Kit (WDK)
>> to third-party developers to create applications and services for
>> viewing on TVs [...]
>
>The excellent XBMC[1] has had Python support for years.

WBR, Vitaliy.


From seaworthyjeremy at gmail.com  Sun Feb  8 17:45:52 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sun, 8 Feb 2009 14:45:52 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
Message-ID: <e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>

Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
have a question:
How far does Python go in the Game Development field? (Using Python
only, no extensions)


From clp2 at rebertia.com  Sun Feb  8 17:55:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 8 Feb 2009 14:55:53 -0800
Subject: Python Module: nift
In-Reply-To: <e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
	<e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902081455w15408f4aof04fedd80ec862d7@mail.gmail.com>

On Sun, Feb 8, 2009 at 2:45 PM, J <seaworthyjeremy at gmail.com> wrote:
> Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
> have a question:
> How far does Python go in the Game Development field? (Using Python
> only, no extensions)

You pretty much need to integrate with some C(++) libraries in order
to write fancier games. However, you yourself don't need to write any
non-Python in order to utilize these libraries.
Pygame (http://www.pygame.org/) is a popular collection of multimedia
library bindings for Python.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jstroud at mbi.ucla.edu  Sun Feb  8 17:58:37 2009
From: jstroud at mbi.ucla.edu (James Stroud)
Date: Sun, 08 Feb 2009 14:58:37 -0800
Subject: TkInter: Problem with propagation of resize events through
	geometry manager hierarchy?
In-Reply-To: <35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>
References: <mailman.9067.1234047013.3487.python-list@python.org>
	<Qkzjl.19884$Ws1.15049@nlpi064.nbdc.sbc.com>
	<35dc67a4-aa61-4e88-a79c-64118c1285e7@o11g2000yql.googlegroups.com>
Message-ID: <xsJjl.16407$yr3.9061@nlpi068.nbdc.sbc.com>

curiouserrandy at gmail.com wrote:
> Thanks!  I hadn't known about the "return 'break'" technique.  But
> I don't follow your sentinel suggestion; how would that sentinel
> ever get reset?

Presumably you would set it from some kind of input. Basically, if you 
don't need to zoom, you wouldn't bother scaling the image. It is the 
scaling step that is expanding your image.

You might want to set any borders to 0.

It seems as if the first time through the event
> chain it'd be set to the sentinel, and the routines that pay
> attention to it would never execute.  What am I missing?
> I tried simply returning 'break' at the end of "refresh()" and
> that made no change in behavior.

You will want to return 'break' at the end of callbacks, like 
display_tag_and_size()

> One thing I've been looking for (including in the source :-J) is
> a description of the precise process that the geometry manager
> goes through in figuring out and then setting sizes for the
> various widgets (on resize or, apparently, startup).  I suspect
> with that + the "return 'break'" technique I could get this to
> work.  But I haven't been having any luck finding that documentation.

I've never found that either. I usually tweak things by trial and error. 
Tkinter (Tk) has some bad habits. Most of the time it is very hard to 
get the precise dimensions of widgets by asking them. The problem is 
exacerbated by platform specific modifications like TkAqua. Ive found 
the best approach is to tweak the math so that the sizing comes out 
consistent and then test and patch for every platform you support. 
Sometimes, if you experiment enough, you can figure out by inference 
what Tk is actually doing under the hood.

The other, more sane option, is to attempt to make guis that don't rely 
on precise size information. Its less satisfying than the pixel level 
control one hopes for, but makes for a faster development process.

Also, you might want to look into Pmw. It has scrolled canvas and 
scrolled frame widgets that might be helpful to you. There is no need to 
reinvent the wheel except for your own enlightenment.

James


-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com


From martin at v.loewis.de  Sun Feb  8 18:01:18 2009
From: martin at v.loewis.de (=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 09 Feb 2009 00:01:18 +0100
Subject: Extracting bytecode out of frozen programs
In-Reply-To: <mailman.9111.1234131185.3487.python-list@python.org>
References: <mailman.9106.1234126502.3487.python-list@python.org>	<498f4c50$0$30899$9b622d9e@news.freenet.de>
	<mailman.9111.1234131185.3487.python-list@python.org>
Message-ID: <498f643e$0$3360$9b622d9e@news.freenet.de>

> get_frozen_object exists at least since 1.5.2, but has never been
> documented, and the source code says it's obsolete. Should be documented
> now? Any alternative?

get_frozen_object has been marked obsolete in 1997. Whether it can be
un-deprecated should be discussed on python-dev; I can't guess the
rationale for deprecating it.

Regards,
Martin


From rhamph at gmail.com  Sun Feb  8 18:05:31 2009
From: rhamph at gmail.com (Rhamphoryncus)
Date: Sun, 8 Feb 2009 15:05:31 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<a22c77c4-a812-4e42-8972-6f3eedf72bb9@l33g2000pri.googlegroups.com> 
	<gmfasd$drp$1@panix3.panix.com>
	<d868213b-6d13-4703-ad2b-650287526225@g1g2000pra.googlegroups.com>
	<9a8af8a3-27fb-4f5b-90ea-ee0276c7e5e3@r15g2000prd.googlegroups.com> 
	<9c2ed038-7a9b-4a35-adae-8b0df890040e@k36g2000pri.googlegroups.com> 
	<mailman.9040.1233984119.3487.python-list@python.org>
	<76695d3b-bc74-4b72-b0ee-0c646d228b6f@t13g2000yqc.googlegroups.com>
	<20090207213917.24c8433a@gmx.net>
	<afcf6a09-0159-4673-a021-c43f8acd7bae@o11g2000yql.googlegroups.com>
	<20090207230719.5bfd6022@gmx.net>
Message-ID: <c6711fdc-c09d-4455-b49a-b3d053bbdd0a@h5g2000yqh.googlegroups.com>

On Feb 7, 3:07?pm, <mma... at gmx.net> wrote:
> On Sat, 7 Feb 2009 12:50:22 -0800 (PST)
> Rhamphoryncus <rha... at gmail.com> wrote:
> > Can you explain this in a little more detail?
>
> In the application, there is one main numpy array of type "O".
> Each element of the array corresponds to one cell in a grid. The user
> may enter a Python expression into the grid cell. The input is
> evaled and the result is stored in the numpy array (the actual process
> is a bit more complicated). Therefore, the object inside a numpy array
> element may be an inconsistent, nested, iterable type.
>
> The user now may access the result grid via __getitem__. When doing
> this, a numpy array that is as flat as possible while comprising the
> maximum possible data depth is returned, i.e.:
>
> 1. Non-string and non-unicode iterables of similar length for each of
> the cells form extra dimensions.
>
> 2. In order to remove different container types, the result is
> flattened, cast into a numpy.array and re-shaped.
>
> 3. Dimensions of length 1 are eliminated.
>
> Therefore, the user can conveniently use numpy ufuncs on the results.
>
> I am referring to the flatten operation in step 2

I'm afraid I still don't understand it, but I'm only minimally
familiar with numpy, nevermind your spreadsheet app.


From gdamjan at gmail.com  Sun Feb  8 18:21:16 2009
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 09 Feb 2009 00:21:16 +0100
Subject: Python3.0 has more duplication in source code than Python2.5
References: <b5037051-5abb-4ccd-8430-9ce2f963496e@l33g2000pri.googlegroups.com>
	<498D3A04.60503@v.loewis.de>
	<ba11a478-c6df-4a2f-a011-0cd90957250b@o2g2000prl.googlegroups.com>
	<6v58gpFi7nnvU1@mid.uni-berlin.de>
	<ac0db4b2-8703-4853-be2b-4270d29fddb3@v5g2000pre.googlegroups.com>
	<mailman.9051.1234023621.3487.python-list@python.org>
	<d6cd51ea-74cf-4ce2-9687-a6c41da411ef@w1g2000prm.googlegroups.com>
	<dbcbd9cf-e754-47f9-a0cb-c32ffcf3eb71@v39g2000pro.googlegroups.com>
Message-ID: <c06466-nu.ln1@archaeopteryx.softver.org.mk>

> I have made the same analysis to some commercial source code, the
> dup60 rate is quite often significantly larger than 15%.

commercial code sucks often .. that's why they hide it :)


-- 
?????? ( http://softver.org.mk/damjan/ )

Scarlett Johansson: You always see the glass half-empty.
Woody Allen: No. I see the glass half-full, but of poison.



From tdelaney at avaya.com  Sun Feb  8 18:31:36 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Mon, 9 Feb 2009 07:31:36 +0800
Subject: Ordered dict by default
In-Reply-To: <6f38e8bc-4ecd-4b9f-abef-b885cd16b375@p37g2000yqd.googlegroups.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C011117DA@301081ANEX2.global.avaya.com>

bearophileHUGS at lycos.com wrote:

> I have missed another example: It may be possible to create a sorting
> routine that's not stable but is faster than the current stable
> timsort (for example in C++ STL you have both sorting routines, and
> the unstable one is a variant of introsort that is faster than the
> stable version). I think Python will keep the stable one, because even
> if (in theory. In practice it may be quite difficult to write such
> unstable sorter faster than timsort) it can be slower, it's safer and
> more useful than an unstable sort.

Python mandates a stable sort, so this will not change. Note that this
used to not be the case - timsort was introduced in Python 2.3, and
*because* it was *both* stable and blazingly fast, the requirement for a
stable sort was back-dated to Python 2.3.

If timsort had not been so overwhelmingly superior to every other option
at the time (and in particular, without any known worst-case scenarios)
then Python would likely still not be requiring a stable sort. But
because it is so good, the extra performance gain from any future
non-stable sort was considered unlikely to offset the benefits of a
stable sort.

Tim Delaney


From spacebar265 at gmail.com  Sun Feb  8 22:26:13 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Sun, 8 Feb 2009 19:26:13 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
Message-ID: <557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>

On Feb 7, 2:17?am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
> > Hi. Does anyone know how to scan a filecharacterbycharacterand
> > have eachcharacterso I can put it into a variable. I am attempting
> > to make a chatbot and need this to read the saved input to look for
> > spelling mistakes and further analysis of user input.
>
> That does not follow. To analyze a text, the worst possible starting
> point is one variable for eachcharacter(what would you call them --
> character_1, character_2, ... character_65802 ?)
>
> /Jorgen
>
> --
> ? // Jorgen Grahn <grahn@ ? ? ? ?Ph'nglui mglw'nafh Cthulhu
> \X/ ? ? snipabacken.se> ? ? ? ? ?R'lyeh wgah'nagl fhtagn!

How else would you check for spelling mistakes? Because input would be
very unlikely to be lengthy paragraphs I wouldn't even need very many
variables. If anyone could suggest an alternative method this would be
much appreciated.


From ptmcg at austin.rr.com  Sun Feb  8 23:01:25 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 8 Feb 2009 20:01:25 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com> 
	<mailman.9109.1234128545.3487.python-list@python.org>
Message-ID: <947d4cef-e3f2-4e1b-91ff-5f98781f0518@t13g2000yqc.googlegroups.com>

On Feb 8, 3:28?pm, Chris Rebert <c... at rebertia.com> wrote:
> This I disagree with as being unnecessarily clever; the dict literal
> is just fine as-is and the zip() makes it less clear. However, I would
> definitely rewrite the dict to use less lines, which, after removing
> the capital dupes (as I mentioned in my post, just use .lower()),
> looks like:
>
> LEET_LETTERS = {"e" : "3", "a" : "4", "i" : "1", "t" : "7", "s" : "5",
> ? ? "o" : "0", "b" : "8"}
>

Maybe so, I was trying to illustrate zip() and maybe this was getting
too far ahead for a new Python user.

I *do* find that when initializing a list of characters (and for some
reason a string wont do), then instead of this:

vowels = ["A", "E", "I", "O", "U"]


using the list constructor is much easier:

vowels = list("AEIOU")


Or more non-deterministically,

sometimes = lambda s : [s] if random.random() > 0.5 else []
vowels = list("AEIOU") + sometimes("Y")


-- Paul


From kyrie at uh.cu  Sun Feb  8 23:01:46 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Sun, 08 Feb 2009 23:01:46 -0500
Subject: Importing a file (not a module).
Message-ID: <1234152106.498faaaa97f1d@mail.uh.cu>


Is there any way to "import" a .py file that is not on sys.path? 
I'd like to 'import' a file that resides somewhere on my filesystem without
having to add it's directory to sys.path. At first, I thought that something like

my_module = __import__("path/to/file")

would work, but I was mistaken. Ideally, the path would be specified as a
relative path from the importer's module, and not from the CWD (that's another
question, I guess).

Related question: how could I change the sys.path for this_script.py without
changing it much? I'd like to have this_script a few more directories on its
pythonpath, but I don't want to clutter the begining of the script with
"sys.path.append(...)"s, specially because I need to do that for several
scripts. I thought of creating a modify_pythonpath.py and import it from all of
them, but I don't want to keep that script on the global python path nor on any
of the project folders (it is required by more than one). 

Currently I have a symlink from the original modify_pythonpath.py to each
project directory, but that seems clumsy.

-- 
Luis Zarrabeitia
Facultad de Matem?tica y Computaci?n, UH
http://profesores.matcom.uh.cu/~kyrie






From gagsl-py2 at yahoo.com.ar  Sun Feb  8 23:06:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 02:06:10 -0200
Subject: [2.5.1] Comparing dates?
References: <iibdo4pfnq9grlkue7vvukpfabd68cok39@4ax.com>
	<87bptl1a4l.fsf@benfinney.id.au>
	<5tkdo4l21dkm9kgv4ra4pftker89odebfu@4ax.com>
	<mailman.8639.1233608458.3487.python-list@python.org>
	<defjo4h89b144i65l3b2gvnio9nbtibor2@4ax.com>
Message-ID: <op.uo2gckqtx6zn5v@gabriel.sleipnir-bsas>

En Wed, 04 Feb 2009 14:11:07 -0200, Gilles Ganault <nospam at nospam.com>  
escribi?:
> On Mon, 2 Feb 2009 22:00:53 +0100, Martin <martin at marcher.name> wrote:

>> as suggested, the DBA should seriously think about defining the
>> correct type of the column here, for intermediate use and getting
>> stuff to work you could use a view and define some stored procedures
>> on it so that inserting properly works...
>
> Right, but SQLite only has two types: Numeric or text, so I figured
> it'd be better to turn dates into the usual YYYY-MM-DD before saving
> data into an SQLite file.

I'd use the built-in adapter/converter instead of rolling my own:
http://docs.python.org/library/sqlite3.html#default-adapters-and-converters

-- 
Gabriel Genellina



From steve at holdenweb.com  Sun Feb  8 23:13:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 23:13:08 -0500
Subject: Scanning a file character by character
In-Reply-To: <557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
Message-ID: <gmoah0$rhh$1@ger.gmane.org>

Spacebar265 wrote:
> On Feb 7, 2:17 am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
>> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
>>> Hi. Does anyone know how to scan a filecharacterbycharacterand
>>> have eachcharacterso I can put it into a variable. I am attempting
>>> to make a chatbot and need this to read the saved input to look for
>>> spelling mistakes and further analysis of user input.
>> That does not follow. To analyze a text, the worst possible starting
>> point is one variable for eachcharacter(what would you call them --
>> character_1, character_2, ... character_65802 ?)
>>
I believe most people would read the input a line at a time and split
the lines into words. It does depend whether you are attempting
real-time spelling correction, though. That would be a different case.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb  8 23:24:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 08 Feb 2009 23:24:51 -0500
Subject: Importing a file (not a module).
In-Reply-To: <1234152106.498faaaa97f1d@mail.uh.cu>
References: <1234152106.498faaaa97f1d@mail.uh.cu>
Message-ID: <gmob70$t36$1@ger.gmane.org>

Luis Zarrabeitia wrote:
> Is there any way to "import" a .py file that is not on sys.path? 
> I'd like to 'import' a file that resides somewhere on my filesystem without
> having to add it's directory to sys.path. At first, I thought that something like
> 
> my_module = __import__("path/to/file")
> 
> would work, but I was mistaken. Ideally, the path would be specified as a
> relative path from the importer's module, and not from the CWD (that's another
> question, I guess).
> 
> Related question: how could I change the sys.path for this_script.py without
> changing it much? I'd like to have this_script a few more directories on its
> pythonpath, but I don't want to clutter the begining of the script with
> "sys.path.append(...)"s, specially because I need to do that for several
> scripts. I thought of creating a modify_pythonpath.py and import it from all of
> them, but I don't want to keep that script on the global python path nor on any
> of the project folders (it is required by more than one). 
> 
> Currently I have a symlink from the original modify_pythonpath.py to each
> project directory, but that seems clumsy.
> 
Take a look at the imp module:

>>> import imp
>>> m = imp.load_source("mymodule", "doors.px")
['G', 'G', 'G'] [1, 1] [1, 1, 1]
['G', 'G', 'C'] [1, 1] [1, 1]
['G', 'C', 'G'] [1] [1, 1]
['G', 'C', 'C'] [1] [1]
['C', 'G', 'G'] [1] [1, 1]
['C', 'G', 'C'] [1] [1]
['C', 'C', 'G'] [] [1]
['C', 'C', 'C'] [] []
>>> m
<module 'mymodule' from 'doors.px'>
>>> import sys
>>> sys.modules['mymodule']
<module 'mymodule' from 'doors.px'>
>>>

As you can see it works with non-standarde xtensions too.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cptn.spoon at gmail.com  Sun Feb  8 23:50:49 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Sun, 8 Feb 2009 20:50:49 -0800 (PST)
Subject: Simple question - stock market simulation
Message-ID: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>

I'm trying to create an incredibly simple stock market simulator to be
used in a childrens classroom and I'm wondering whether someone can
point me in the right direction.

I basically want to be able to have a stock struct as follows:

StockName = "Test"
StockPriceList = (12,13,12,10,10,8,10)
StockRisk = 0.15
StockQty = 2000

And then have a StockMarket struct that can contain 1 to many Stocks.
I then want to be able to iterate through the stocks to perform
operations as such:

for Stock in StockMarket:

I'm not asking for tips on the program itself, I just can't figure out
how to get the data structures in place. Would I use Classes or would
I use dictionaries? Am I completely off the mark with this?

Apologies for such a rudimentary question...I'm very new to all this.


From http  Sun Feb  8 23:58:54 2009
From: http (Paul Rubin)
Date: 08 Feb 2009 20:58:54 -0800
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
Message-ID: <7xljsgyzn5.fsf@ruckus.brouhaha.com>

"cptn.spoon" <cptn.spoon at gmail.com> writes:
> I'm not asking for tips on the program itself, I just can't figure out
> how to get the data structures in place. Would I use Classes or would
> I use dictionaries? Am I completely off the mark with this?

Typically you would use a class for the multi-fielded data structure;
a dictionary is intended more for lookup tables where you don't know
ahead of time what the keys will be.  Also, you'd typically use a list
[1,2,3] rather than a tuple (1,2,3) to hold the price list.


From cptn.spoon at gmail.com  Mon Feb  9 00:10:54 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Sun, 8 Feb 2009 21:10:54 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
Message-ID: <1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>

On Feb 9, 3:58?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> "cptn.spoon" <cptn.sp... at gmail.com> writes:
> > I'm not asking for tips on the program itself, I just can't figure out
> > how to get the data structures in place. Would I use Classes or would
> > I use dictionaries? Am I completely off the mark with this?
>
> Typically you would use a class for the multi-fielded data structure;
> a dictionary is intended more for lookup tables where you don't know
> ahead of time what the keys will be. ?Also, you'd typically use a list
> [1,2,3] rather than a tuple (1,2,3) to hold the price list.

Thanks Paul! I thought this might be the case. So how would I get the
StockMarket class instance to contain many Stock class instances and
then be able to iterate through them? I'm guessing the basic structure
would be as follows...but I think I'm wrong:

class StockMarket:
  pass

class Stock:
  def __init__(self, stockname, stockpricelist[], stockrisk,
stockqty):
    self.stockname = stockname
    self.stockpricelist[] = stockpricelist[]
    self.stockrisk = stockrisk
    self.stockqty = stockqty

Can you possibly point me in the right direction?

Thanks
Phil


From gherron at islandtraining.com  Mon Feb  9 00:44:28 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 08 Feb 2009 21:44:28 -0800
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <20090208203306.GA578@beauTy.hsd1.ca.comcast.net>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>	<498F1D54.9010509@islandtraining.com>
	<20090208203306.GA578@beauTy.hsd1.ca.comcast.net>
Message-ID: <498FC2BC.2070300@islandtraining.com>

nick at stinemates.org wrote:
> Gary
>
> Your email client is set to HTML mode and looks terrible for those of us
> who prefer plain view. It also appears your client is not properly
> sending your message in  text/plain encoding.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

Understood.  I too prefer text only, but mistakenly hit "HTML only" for
that email.  Once sent, though, there was no way to recall and fix it. 


From http  Mon Feb  9 00:48:59 2009
From: http (Paul Rubin)
Date: 08 Feb 2009 21:48:59 -0800
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <7x7i4017p0.fsf@ruckus.brouhaha.com>

"cptn.spoon" <cptn.spoon at gmail.com> writes:
>   def __init__(self, stockname, stockpricelist[], stockrisk,
> stockqty): ...

You would say just stockpricelist rather than stockpricelist[],  but
other than that your class def looks good.


From tjreedy at udel.edu  Mon Feb  9 01:29:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:29:02 -0500
Subject: Python Module: nift
In-Reply-To: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
Message-ID: <gmoifc$a3h$1@ger.gmane.org>

J wrote:
> What are your thoughts on this module I created?
> 
> '''
>     A Python Module created by a High School Student.
>            Includes rev(), reet(), and leet().

Gutsy of you to post this.

>     Setup:
>                     * Save to Python Directory\Lib\ as nift.py

Add-in modules and packages like this should better go in 
pythonxy/Lib/site-packages, which is there just for this purpose.
One can then easily see what add-ons ore present or not, or delete them, 
  or avoid deletion with uninstallation, or move to another version of 
Python.

tjr



From tjreedy at udel.edu  Mon Feb  9 01:33:24 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:33:24 -0500
Subject: Lists implemented as integer-hashed Dictionaries?
In-Reply-To: <gmncbh$eui$1@ger.gmane.org>
References: <775033410902061918l3a16c8fi82329b8f6f244daa@mail.gmail.com>	<50697b2c0902061925w36ed850bw796f6737c15e06af@mail.gmail.com>	<775033410902061932g6f943500s267d07f68accef98@mail.gmail.com>	<7a9c25c20902062047y8afacb8xd0ab1649d7ab843e@mail.gmail.com>
	<gmncbh$eui$1@ger.gmane.org>
Message-ID: <gmoini$a3h$2@ger.gmane.org>

Christian Heimes wrote:
>
> Sets are basically dicts without values.

For CPython true, but abstractly, dicts are sets with values, and 
mappings are often viewed as sets of key,value pairs.



From tjreedy at udel.edu  Mon Feb  9 01:43:28 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 01:43:28 -0500
Subject: Simple question - stock market simulation
In-Reply-To: <1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>	<7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <gmojae$boh$1@ger.gmane.org>

cptn.spoon wrote:
> On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> "cptn.spoon" <cptn.sp... at gmail.com> writes:
>>> I'm not asking for tips on the program itself, I just can't figure out
>>> how to get the data structures in place. Would I use Classes or would
>>> I use dictionaries? Am I completely off the mark with this?
>> Typically you would use a class for the multi-fielded data structure;
>> a dictionary is intended more for lookup tables where you don't know
>> ahead of time what the keys will be.  Also, you'd typically use a list
>> [1,2,3] rather than a tuple (1,2,3) to hold the price list.
> 
> Thanks Paul! I thought this might be the case. So how would I get the
> StockMarket class instance to contain many Stock class instances and
> then be able to iterate through them? I'm guessing the basic structure
> would be as follows...but I think I'm wrong:
> 
> class StockMarket:
>   pass
> 

I would start with using a list for StockMarket.

> class Stock:
>   def __init__(self, stockname, stockpricelist[], stockrisk,
> stockqty):
>     self.stockname = stockname
>     self.stockpricelist[] = stockpricelist[]
>     self.stockrisk = stockrisk
>     self.stockqty = stockqty

I would remove the redundant 'stock' from all the parameter and 
attribute names.  (And call 'qty' 'quantity'.)

You will iterating like so:

for stock in StockMarket:
   print(stock.name, stock.quantity,.... or whatever, and the iteration 
variable makes clear that a stock is a Stock.

tjr



From mail at johnohagan.com  Mon Feb  9 01:45:39 2009
From: mail at johnohagan.com (John O'Hagan)
Date: Mon, 9 Feb 2009 06:45:39 +0000
Subject: self-aware list of objects able to sense constituent member
	alterations?
In-Reply-To: <6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>
References: <3043ae5c-0168-4249-8a21-63d0268b36f1@k36g2000pri.googlegroups.com>
	<mailman.8186.1233135479.3487.python-list@python.org>
	<6c42d5ee-7bd1-4741-8d80-51c611790699@z28g2000prd.googlegroups.com>
Message-ID: <200902090645.40793.mail@johnohagan.com>

On Fri, 6 Feb 2009, greywine at gmail.com wrote:
> On Jan 28, 4:37?am, John O'Hagan <m... at johnohagan.com> wrote:
> > On Tue, 27 Jan 2009, Reckoner wrote:
> > > I'm not sure this is possible, but I would like to have
> > > a list of ?objects
> > >
> > > A=[a,b,c,d,...,z]
> > >
> > > where, ?in the midst of a lot of processing I might do something like,
> > >
> > > A[0].do_something_which_changes_the_properties()
> > >
> > > which alter the properties of the object 'a'.
> > >
> > > The trick is that I would like A to be mysteriously aware that
> > > something about the ?object 'a' has changed so that when I revisit A,
> > > I will know that the other items in the list need to be refreshed to
> > > reflect the changes in A as a result of changing 'a'.
> > >
> > > Even better would be to automatically percolate the subsequent changes
> > > that resulted from altering 'a' for the rest of the items in the list.
> >
> > [...]
> >
> > Interesting question.
> >
> > Maybe this is too simple for your purpose (or maybe just wrong!), but
> > could you subclass list and give it an "update" method which keeps a
> > dictionary of the state of its members and/or calls another method that
> > makes the appropriate changes in the other members when a change occurs,
> > something like:
> >
> > class SelfAwareList(list):
> >
> > ? ? state_dict = {}
> >
> > ? ? def update(self):
> > ? ? ? ? for i in self:
> > ? ? ? ? ? ? if i.state == 'some_condition':
> > ? ? ? ? ? ? ? ? self.do_stuff_to_other_members()
> > ? ? ? ? ? ? self.state_dict[i] = i.state
> >
> > ? ? def do_stuff_to_other_members(self):
> > ? ? ? ? print 'doing stuff...'
> >
> > ?
> >
> > You could manually call update() on the SelfAwareList instance after
> > calling a method on a SelfAwareList member, or even build it into the
> > members' methods so that it was automatic.
> >
> > HTH,
> >
> > John
>
> Hi Reckoner & John O'Hagan,
>
> Great thread, very interesting.
>
> John, I haven't seen anything like your class that uses list instead
> of object and refers to state directly (i.state in self).  Could you
> elaborate?  Here would be my implementation of your idea:
>
> class SelfAwareList2(object):
>
>     def __init__(self, l):
>         self.l = l
>         self.changed = [False for element in l]
>
>     def __str__(self):
>         return str(self.l)
>
>     def update(self, index, value):
>         self.l[index] = value
>         self.changed[index] = True
>
>     def do_stuff_to_other_members(self):
>         for i in self.changed:
>             if i==False:
>                 self.l[i] += 1
>
> Here you can print and whenever you update your list, self.changed
> keeps track of what changed.  Later on you can call do_stuff_to_others
> which in this case adds 1 to each other element.
>
> I assume that your class replaces the awkwardness of l.update(0, 5)
> with l[0] = 5, but I can't quite wrap my mind around it.

I think my suggestion was much more simplistic than what the OP was after, 
which was far more thoroughly answered by others.

But as far as my version goes, your implementation is fine as far as I can 
tell; although I (possibly mistakenly) interpreted the OP as wanting 
something which kept track of _how_ the items in the list changed, not just 
_if_ they changed.

Trying to put together an example was (naturally) more complicated than I 
thought, but here's a silly one, with apologies to Steven D'Aprano among 
others for stealing the parrot theme:

class Parrot(object):

    def __init__(self, name):
        self.color = 'red'
        self.name = name
    def __repr__(self):
        return self.name

class SelfAwareListOfParrots(list):

    colors = ['red', 'blue', 'yellow', 'green', 'black', 'white']
    state_dict = {}
    
    def update(self, changed=None):
        """Ensure no duplicate colors and record changes"""
        for parrot in self:
            used_colors = [parrot.color for parrot in self]
            available_colors = [color for color in self.colors
                if color not in used_colors]
            if (parrot is not changed and 
                used_colors.count(parrot.color) > 1):          	
                parrot.color = available_colors[0]	
            self.state_dict[parrot] = parrot.color
                
    def change(self, parrot, color):
	"""Change color and update"""
        self[self.index(parrot)].color = color
        self.update(parrot)

This list knows when a parrot has had its color changed by calling change() on 
the list, and makes sure no parrots are the same color by changing any 
parrots of duplicate color. It has a state_dict attribute  (redundant in this 
example) which keeps track of the colors after an update. (My version of the 
update method updates the whole list). 

The trick is to have the method that changes the elements of the list defined 
in the list class definition, rather than that of the elements' class, that 
way it's easy for the list to know about changes to its elements.

(If a parrots color is changed directly, update() will still ensure unique 
colors, but will not preserve the change unless that parrot is given as an 
argument.)

For example:

polly = Parrot('polly')
molly = Parrot('molly')
dolly = Parrot('dolly')

salp = SelfAwareListOfParrots([polly, molly, dolly])

print salp.state_dict

>>>{molly: 'yellow', polly: 'white', dolly: 'black'}

salp.change(polly, 'black')

print salp.state_dict

>>>{molly: 'yellow', polly: 'black', dolly: 'white'}

As for the subclassing of list, that allows you to create a class with all the 
methods of a list, to which you can add your own. (Although any list methods 
which return a new list will return a list, not an instance of your class, 
unless you define them to do so in your class definition). 

In my post quoted above, by "i.state" I was probably abusing the term "state" 
to signify "some arbitrary attribute" of i.

I'm pretty new to this stuff, but there are plenty of tutorials on it out 
there, and I'm relying on others to correct any fallacies I may be 
unwittingly propagating here. :)

Regards,

John


From aleksandr.goretoy at gmail.com  Mon Feb  9 01:48:27 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Mon, 9 Feb 2009 00:48:27 -0600
Subject: GAE open()
Message-ID: <fa98a9e30902082248v7190dafm28f79501a325e317@mail.gmail.com>

Hello,

How to open binary file for writing into datastore. I'm trying to loop over
listdir output of images directory, How to do this without using

self.request.POST.get.file.read(), or rather how to loop this task in app
engine

file(os.curdir+"somefile").read()

UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position
14: ordinal not in range(128)

but when I try to read binary with b, I get IOError.


    raise IOError('invalid mode: %s' % mode)
IOError: invalid mode: b

-Alex Goretoy
http://www.alexgoretoy.com
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From greg.ewing at canterbury.ac.nz  Mon Feb  9 01:51:46 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 09 Feb 2009 19:51:46 +1300
Subject: Python binaries with VC++ 8.0?
Message-ID: <6va201FijdteU1@mid.individual.net>

Is there anywhere I can download a set of Python
binaries, of any version, that have been built
with Visual C++ 8.0?

I'm trying to hook Python up to Sketchup 7 on
Windows, and I think I'm having problems because
Sketchup is linked with msvcr80.dll.

-- 
Greg


From Bornstub at gmail.com  Mon Feb  9 01:52:05 2009
From: Bornstub at gmail.com (Victor Lin)
Date: Sun, 8 Feb 2009 22:52:05 -0800 (PST)
Subject: How to debug deadlock?
Message-ID: <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30@r10g2000prf.googlegroups.com>

Hi,

I am developing a multi-threading application, I encounter a deadlock.
I use Visual C++ Express 2008 to trace the program. Once the deadlock
occurs, I just pause the program and trace. I found that when deadlock
occurs, there will be two threads called python from my C++ extension.
All of them use Queue in python code, so I guess the deadlock might
caused by Queue. But however, once the extension goes into python
code, I can't see nothing but asm code and binary from the VC++
debugger. I would like to know are there any way to dump the call
stack of python code after I paused the program? And how can I know
what lock are there in threads caused the deadlock?

Thanks.
Victor Lin.


From r.warhekar at gmail.com  Mon Feb  9 02:04:49 2009
From: r.warhekar at gmail.com (Rahul)
Date: Sun, 8 Feb 2009 23:04:49 -0800 (PST)
Subject: adodb has no attribute connect
Message-ID: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>

Hello all,

I have to access data from database using adodb so I did

Import adodb
Conn=adodb.NewADOConnection("odbc")

Upto this it works properly but when I say

Conn.Connect("","","")

It gives error as

[Attributrerror]: Object Nonetype has no attribute Connect.

I have Red Hat Enterprise Linux 4
Python 2.5
Mod_python 3.3.1

The same is also not working from python console

Please guide me through this.


From pavlovevidence at gmail.com  Mon Feb  9 02:14:52 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sun, 8 Feb 2009 23:14:52 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
Message-ID: <17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>

On Feb 8, 10:51?pm, Greg Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Is there anywhere I can download a set of Python
> binaries, of any version, that have been built
> with Visual C++ 8.0?
>
> I'm trying to hook Python up to Sketchup 7 on
> Windows, and I think I'm having problems because
> Sketchup is linked with msvcr80.dll.

I'm pretty sure 2.6.1 is compiled with 8.0.  However, I think the
Visual C++ 8.0 uses msvcrt90.dll.

Take a look at this bug report to see if it's related to your issue:

http://bugs.python.org/issue4566


Carl Banks


From stefan_ml at behnel.de  Mon Feb  9 02:20:35 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 09 Feb 2009 08:20:35 +0100
Subject: ElementTree and clone element toot
In-Reply-To: <gmn1e5$3eh$1@panix3.panix.com>
References: <4986bfd7$0$9385$ba4acef3@news.orange.fr>
	<gmn1e5$3eh$1@panix3.panix.com>
Message-ID: <498fd943$0$32667$9b4e6d93@newsspool2.arcor-online.net>

Aahz wrote:
> In article <4986bfd7$0$9385$ba4acef3 at news.orange.fr>,
> m.banaouas <banaouas.medialog at wanadoo.fr> wrote:
>> Working with the ElementTree module, I looked for clone element
>> function but not found such tool:
> 
> Have you tried using copy.deepcopy()?

While being the most obvious solution, calling deepcopy() on an Element is
surprisingly slow in ElementTree.

http://codespeak.net/lxml/performance.html#deepcopy

It's actually multiple times faster to rebuild the tree manually through
the API than to let deepcopy() do it. Fredrik also has written a little
factory for mass reproduction of Element trees.

http://effbot.python-hosting.com/file/stuff/sandbox/elementlib/clone.py

Stefan


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 02:26:33 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 09 Feb 2009 07:26:33 GMT
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
	<838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>
Message-ID: <pan.2009.02.09.07.26.34@REMOVE.THIS.cybersource.com.au>

On Sun, 08 Feb 2009 13:34:50 -0800, bearophileHUGS wrote:

> Gabriel Genellina:
>> bearophile:
>> > - Generally I suggest to learn to code in the small, using as little
>> > code as possible.
>>
>> I completely agree with all the above suggestions, except this last
>> one. Ok, I think I know what you mean, but a beginner might understand
>> this completely wrong. Readability is important, and trying to compress
>> too much code into one single line should not be the ultimate goal.
> 
> What I meant is to use less code as possible, keeping readability and
> the original flexibility.

I think a better description is, use as little code as you need, and no 
extra, but no less. As Einstein said about physics theories: "As simple 
as possible, but no simpler."


> I can't stress enough the importance of writing less code. Every new
> programmer has to learn how much important it is. Less code means less
> bugs, less lines to edit and debug, etc. 

[pedant]
There's less code, fewer bugs and lines. Less applies to continuous 
quantities, like weight and "amount of code", and fewer applies to 
countable quantities.

Don't worry, I frequently get it wrong too, and I'm a native English 
speaker :)


> Less code is usually more
> elegant, and often more readable (even if you take 3 times to read each
> line it may be good anyway if you have 1/10 of the lines of code.
> Recently in the "Java to Python" thread someone has posted some Java
> class that is scary, you can probably write the same thing in 1/10-1/20
> of the lines of code).

Within reason, naturally. There's a reason why we write:

for button in buttons:
    move(button, delta_x, delta_y)

instead of

for b in bs: mv(b, x, y)

even though the second is significantly shorter. Keyword arguments versus 
positional arguments is another example where more verbose code is easier 
to read and maintain than shorter code.


Also, I don't think there's much advantage in trying to push new 
programmers to reduce the amount of code. Until you're really comfortable 
with the language, you need training wheels and scaffolding in the form 
of verbose code. Sometimes you really don't appreciate Python's labour 
saving features until you've experienced how much labour there is to be 
saved.


-- 
Steven


From mail at microcorp.co.za  Mon Feb  9 02:40:07 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 9 Feb 2009 09:40:07 +0200
Subject: Importing a file (not a module).
References: <1234152106.498faaaa97f1d@mail.uh.cu>
Message-ID: <000301c98a8c$c7d74c00$0d00a8c0@hendrik>

"Luis Zarrabeitia" <ky..e at u...cu> wrote:

>Is there any way to "import" a .py file that is not on sys.path?
>I'd like to 'import' a file that resides somewhere on my filesystem without
>having to add it's directory to sys.path. At first, I thought that something
like
>
>my_module = __import__("path/to/file")
>
>would work, but I was mistaken. Ideally, the path would be specified as a
>relative path from the importer's module, and not from the CWD (that's another
>question, I guess).

I have used execfile(RelativeFromCWDOrAbsolutePathToTheFile) to do
this sort of thing. But beware - it does not create a module, so it's a bit
like:

from something import *

This may or may not be useful in your case.

- Hendrik




From cournape at gmail.com  Mon Feb  9 02:48:12 2009
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 9 Feb 2009 16:48:12 +0900
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
Message-ID: <5b8d13220902082348h7b37c045veea3f678b814fe5f@mail.gmail.com>

On Mon, Feb 9, 2009 at 4:14 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> On Feb 8, 10:51 pm, Greg Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> Is there anywhere I can download a set of Python
>> binaries, of any version, that have been built
>> with Visual C++ 8.0?
>>
>> I'm trying to hook Python up to Sketchup 7 on
>> Windows, and I think I'm having problems because
>> Sketchup is linked with msvcr80.dll.
>
> I'm pretty sure 2.6.1 is compiled with 8.0.

Hm, I have just run python to check: it is built with MSC v.1500,
which corresponds to VS 2008, e.g. VS 9, at least on 32 bits.

David


From mail at microcorp.co.za  Mon Feb  9 02:48:55 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 9 Feb 2009 09:48:55 +0200
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
Message-ID: <000401c98a8c$c86e5be0$0d00a8c0@hendrik>

"cptn.spoon" <cp....on at gmail.com> wrote:

On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:

>Thanks Paul! I thought this might be the case. So how would I get the
>StockMarket class instance to contain many Stock class instances and
>then be able to iterate through them? I'm guessing the basic structure
>would be as follows...but I think I'm wrong:
>
>class StockMarket:
>  pass

No.
At this level, just use a list of instances of your Stock class.

- Hendrik




From rodmena.com at gmail.com  Mon Feb  9 04:05:19 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Mon, 9 Feb 2009 01:05:19 -0800 (PST)
Subject: Local python web server problem
Message-ID: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>

Hi everyone. I have started to develop a web base software for
renderfarm managing.
I run the cherrypy hello world! example and when I visit
127.0.0.1:8080
on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
local network is 192.168.100.18
but when I visit 192.168.100.18, there is another page: "It Works!".
What is "It Works!"? and when I type 192.168.100.18:8080 in another
local pc, the page didn't load?

Sorry I am newbie in network area, so I have these two questions:
1- How can I serve my page in local network?
2- what is "It Works!" in 192.168.100.18? we have
192.168.100.<10-70> . no pc has this but mine!!!

3- Could you please explain me or at least point me to the right
direction of making little local web server, localhost?

4- How can I access to the server that serves web page in 56566 port?
I try 192.168.100.18:56566
but the page could not load. I can ping 192.168.100.18 but I can't
load web pages from it.
Why?


Thanks and sorry for my bad English.


From skippy.hammond at gmail.com  Mon Feb  9 04:32:22 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Mon, 09 Feb 2009 20:32:22 +1100
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <6va201FijdteU1@mid.individual.net>
References: <6va201FijdteU1@mid.individual.net>
Message-ID: <498FF826.50008@gmail.com>

On 9/02/2009 5:51 PM, Greg Ewing wrote:
> Is there anywhere I can download a set of Python
> binaries, of any version, that have been built
> with Visual C++ 8.0?

IIRC, no.  Python skipped that version of MSVC.  I believe Python 2.5 
builds easily with vc8 project files in svn though.

> I'm trying to hook Python up to Sketchup 7 on
> Windows, and I think I'm having problems because
> Sketchup is linked with msvcr80.dll.

What problems specifically?  The only practical problems you should see 
will arise if you try and pass a "FILE *", or allocate memory you then 
ask python to free (or vice-versa) - both should be avoidable though...

Mark


From research at johnohagan.com  Mon Feb  9 04:43:36 2009
From: research at johnohagan.com (John O'Hagan)
Date: Mon, 9 Feb 2009 09:43:36 +0000
Subject: Small socket problem
Message-ID: <200902090943.36445.research@johnohagan.com>

Hi, 

I'm using the socket module (python 2.5) like this (where 'options' refers to 
an optparse object) to connect to the Fluidsynth program:

            host = "localhost"
            port = 9800
            fluid = socket(AF_INET, SOCK_STREAM)
            try:
                fluid.connect((host, port))  #Connect if fluidsynth is running
            except BaseException:
                print "Connecting to fluidsynth..." #Or start fluidsynth
                soundfont =  options.soundfont
                driver = options.driver
                Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
                "-C", "1",  "-R", "1", "-l", "-a", driver, "-j", soundfont])
                timeout = 50
                while 1:
                    timeout -= 1
                    if timeout == 0:
                        print "Problem with fluidsynth: switching to synth."
                        play_method = "synth"
                        break
                    try:
                        fluid.connect((host, port))
                    except BaseException:
                        sleep(0.05)
                        continue
                    else:
                        break

(I'm using BaseException because I haven't been able to discover what 
exception class[es] socket uses).

The problem is that this fails to connect ( the error is "111: Connection 
refused") the first time I run it after booting if fluidsynth is not already 
running, no matter how long the timeout is; after Ctrl-C'ing out of the 
program, all subsequent attempts succeed. Note that fluidsynth need not be 
running for a success to occur. 

I've also tried it without the while loop, simply sleeping for a few seconds 
to give fluidsynth time to start (not a preferred approach as I want a short 
startup), but the same thing happens.

I am a long way from being a networking guru and am at a loss as to how to 
debug this. Maybe someone can point out some flaw in my use of socket.

Thanks,

John O'Hagan


From Ron.Barak at lsi.com  Mon Feb  9 04:51:45 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 9 Feb 2009 09:51:45 +0000
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
	<mailman.9087.1234101684.3487.python-list@python.org>
	<ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>

Hi John,

Thanks for the suggestion.

What I do now in preparation for pickling is:

            for_pickle_log_stream = LogStream(sac_log_file)
            for key in log_stream.__dict__:
                if key != "input_file":
                    for_pickle_log_stream.__dict__[key] = log_stream.__dict__[key]
            del for_pickle_log_stream.__dict__["input_file"]

(i.e., log_stream is the source instance, and for_pickle_log_stream is the target)

So, it seems to be in agreement with your suggestion.

Thanks and bye,
Ron.

-----Original Message-----
From: John Machin [mailto:sjmachin at lexicon.net]
Sent: Sunday, February 08, 2009 23:04
To: python-list at python.org
Subject: Re: How to copy an instance without its cStringIO.StringO item ?

On Feb 9, 1:01 am, Christian Heimes <li... at cheimes.de> wrote:
> Barak, Ron schrieb:
>
> > Hi,
>
> > I need to copy an instance of a class, where one of the items in the original is a cStringIO.StringO object.
> > I do not need the cStringIO.StringO in the target object.
> > The target instance is to be pickled.
>
> > Googling made me devise the following plan: do a deepcopy from the original to the target, and then delete the cStringIO.StringO object from the target.
>
> > However, trying to use copy.deepcopy produced: TypeError:
> > object.__new__(cStringIO.StringO) is not safe, use
> > cStringIO.StringO.__new__()
>
> > Is there a way to create a copy of the instance, sans the cStringIO.StringO ?
>
> > If I find no elegant way to do that, I thought of creating a "blank" target instance; then iterating over the __dict__ of the original, and manually copy the items to the target (while not copying the cStringIO.StringO to the target).
>
> > Can you suggest a better way ?
>
> You can overwrite some functions in order to omit attributes from a
> pickle. It's all documented athttp://docs.python.org/library/pickle.html#pickling-and-unpickling-no...

If there is no chance that some other thread could be accessing the source object, can't the OP just do:
    temp = source.stringio
    del source.stringio
    # make a pickle from source
    source.stringio = temp
?




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From bearophileHUGS at lycos.com  Mon Feb  9 04:57:56 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 9 Feb 2009 01:57:56 -0800 (PST)
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<mailman.9100.1234119241.3487.python-list@python.org>
	<1eb3e6de-2092-45f8-b270-81845cbe1ed2@h20g2000yqn.googlegroups.com>
	<mailman.9107.1234126529.3487.python-list@python.org>
	<838a342c-64e0-4c97-a0d0-9e2475696f74@z1g2000yqn.googlegroups.com>
	<pan.2009.02.09.07.26.34@REMOVE.THIS.cybersource.com.au>
Message-ID: <fefa68ea-3dcf-4694-9fde-9a9508bb2821@l16g2000yqo.googlegroups.com>

Steven D'Aprano:
> There's less code, fewer bugs and lines. Less applies to continuous
> quantities, like weight and "amount of code", and fewer applies to
> countable quantities.

Thank you, I'll try to improve my use of the language.


> Within reason, naturally. There's a reason why we write:
> for button in buttons:
> ? ? move(button, delta_x, delta_y)
> instead of
> for b in bs: mv(b, x, y)
> even though the second is significantly shorter.

Often Shortening names and packing more stuff in single lines that
deserve to be two lines aren't good ways to shorten code.


> Also, I don't think there's much advantage in trying to push new
> programmers to reduce the amount of code. Until you're really comfortable
> with the language, you need training wheels and scaffolding in the form
> of verbose code. Sometimes you really don't appreciate Python's labour
> saving features until you've experienced how much labour there is to be
> saved.

I don't agree. When you learn to code you also have to learn what does
it mean to write "good code", you have to learn that there are several
things that are important beside writing a correct output, like good
comments, well thought out names, good indentation, good idioms, quick
running time, small memory usage, writing clear and readable code, and
later develop elegance, the power of composition, abstraction,
indirection, meta programming, etc. Among such things there's the
importance of writing short programs. All such things are the seeds
that will develop into the personal style of the future programmer.

Such things are also useful for another purpose: to help the student
understand that code is craftsmanship, so she/he/shi can (and is
supposed to) be proud of the code that writes. This helps the student
understand that programming isn't just an ugly way to tell orders to a
moronic CPU, that helps develop appreciation for the act of writing
code, because it becomes something you do also for the sake of it, as
you do art, beside for usefulness. So you have to teach and show such
things from more or less the beginning.

Bye,
bearophile


From clp2 at rebertia.com  Mon Feb  9 05:13:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 02:13:00 -0800
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <50697b2c0902090213s193576f5w58430c4a2e7ee07d@mail.gmail.com>

On Tue, Feb 10, 2009 at 2:03 AM, Joel Ross <joelc at cognyx.com> wrote:
> Hi all,
>
> I have this piece of code:
> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')

Why are you opening the file in binary mode? It's content is text!

>
> def readLines():
>
>        for line in file.read():

.read() reads the *entire* file into a string. When you iterate over a
string, such as in a for-loop, you get *individual characters*,
whereas you appear to want lines of text. To go line-by-line, use `for
line in file` instead (note: `line` will include the trailing newline
at the end of each line).
And don't use `file` as a variable name; it shadows the name of the
buitlin type.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sjmachin at lexicon.net  Mon Feb  9 05:28:17 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 09 Feb 2009 21:28:17 +1100
Subject: How to copy an instance without its cStringIO.StringO item ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>
References: <mailman.41126.1234094855.3486.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68778F@enbmail01.lsi.com>
	<mailman.9087.1234101684.3487.python-list@python.org>
	<ddb2e4b2-dd53-47d3-95cb-abbcc24ad95e@s9g2000prg.googlegroups.com>
	<7F0503CD69378F49BE0DC30661C6CCF60E6877F0@enbmail01.lsi.com>
Message-ID: <49900541.6090509@lexicon.net>

On 9/02/2009 8:51 PM, Barak, Ron wrote:
> Hi John,
> 
> Thanks for the suggestion.
> 
> What I do now in preparation for pickling is:
> 
>             for_pickle_log_stream = LogStream(sac_log_file)   
>             for key in log_stream.__dict__:
>                 if key != "input_file":
>                     for_pickle_log_stream.__dict__[key] = 
> log_stream.__dict__[key]
>             del for_pickle_log_stream.__dict__["input_file"]   
> 
> (i.e., log_stream is the source instance, and for_pickle_log_stream is 
> the target)
> 
> So, it seems to be in agreement with your suggestion.

which was
"""
  If there is no chance that some other thread could be accessing the
  source object, can't the OP just do:
      temp = source.stringio
      del source.stringio
      # make a pickle from source
      source.stringio = temp
"""
which I regard as radically different to your approach; please explain 
what you mean by "in agreement with".




From sjmachin at lexicon.net  Mon Feb  9 05:47:03 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 9 Feb 2009 02:47:03 -0800 (PST)
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
	<mailman.9133.1234174389.3487.python-list@python.org>
Message-ID: <2c44fc1d-54bc-40f9-9d7c-3c5031c4489d@a39g2000prl.googlegroups.com>

On Feb 9, 9:13?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 10, 2009 at 2:03 AM, Joel Ross <jo... at cognyx.com> wrote:
> > Hi all,
>
> > I have this piece of code:
> > #########################################################################
>
> > wordList = "/tmp/Wordlist"
> > file = open(wordList, 'r+b')
>
> Why are you opening the file in binary mode? It's content is text!
>
>
>
> > def readLines():
>
> > ? ? ? ?for line in file.read():
>
> .read() reads the *entire* file into a string. When you iterate over a
> string, such as in a for-loop, you get *individual characters*,
> whereas you appear to want lines of text. To go line-by-line, use `for
> line in file` instead (note: `line` will include the trailing newline
> at the end of each line).
> And don't use `file` as a variable name; it shadows the name of the
> buitlin type.
>

Changed as suggested above, with further comments:

wordList = "/tmp/Wordlist"
f = open(wordList, 'r')
def readLines():
## There is no point in putting the next four lines
## inside a function if you are going to call the
## function (a) immediately and (b) once only.
## All it does is provide scope for unwanted complications.
   for line in f:
        line = line.rstrip('\n')
        print line + '.com '
## Complications like this next line; why is it returning "line"??
## And why is it indented like that?
## It will cause only the first line to be read.
        return line
## Maybe you you meant it to be here:
    return
## But then it's redundant because a function returns anyway
## when flow of control would fall off the bottom.
readLines()
f.close()

HTH,
John


From pete.forman at westerngeco.com  Mon Feb  9 06:45:34 2009
From: pete.forman at westerngeco.com (Pete Forman)
Date: Mon, 09 Feb 2009 11:45:34 +0000
Subject: Tkinter w.pack()?
References: <D0agl.14448$yr3.10242@nlpi068.nbdc.sbc.com>
	<b50f4998-cc9f-49c1-b622-5955f89fe4eb@j35g2000yqh.googlegroups.com>
	<LEagl.19786$ZP4.12351@nlpi067.nbdc.sbc.com>
	<mailman.8272.1233232075.3487.python-list@python.org>
	<Fi_gl.15030$YU2.3134@nlpi066.nbdc.sbc.com>
	<mailman.8488.1233440963.3487.python-list@python.org>
	<_Lghl.12218$D32.6047@flpi146.ffdc.sbc.com>
	<mailman.8522.1233496608.3487.python-list@python.org>
	<u9Zil.9977$hc1.752@flpi150.ffdc.sbc.com>
	<mailman.8992.1233938703.3487.python-list@python.org>
	<Jnijl.16292$yr3.5511@nlpi068.nbdc.sbc.com>
Message-ID: <bptbvnoh.fsf@wgmail2.gatwick.eur.slb.com>

"W. eWatson" <notvalid2 at sbcglobal.net> writes:

 > MRAB wrote:
>> W. eWatson wrote:
 > ...
>>> I thought some months ago, I found Google commands that would
>>> operate in the browser link window. Guess not.
>>>
>>> BTW, isn't there an O'Reilly book on Google hacks of this sort? 
>>> Where else does one find out about these Google tools?
>>>
>> Google? :-)
>> http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861
>>
 > Thanks. I may have that book marked from many, many months ago. If so,
 > I see why I'd never find it. The BM entry does not show "Google". It
 > does now. ;-)

As well as the site: modifier check out inurl: and friends.

  http://www.google.com/help/operators.html

-- 
Pete Forman                -./\.-  Disclaimer: This post is originated
WesternGeco                  -./\.-   by myself and does not represent
pete.forman at westerngeco.com    -./\.-   the opinion of Schlumberger or
http://petef.22web.net           -./\.-   WesternGeco.


From psaffrey at googlemail.com  Mon Feb  9 07:12:29 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 04:12:29 -0800 (PST)
Subject: Which core am I running on?
Message-ID: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>

Is there some way I can get at this information at run-time? I'd like
to use it to tag diagnostic output dumped during runs using Parallel
Python.

Peter


From gh at ghaering.de  Mon Feb  9 07:20:16 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:20:16 +0100
Subject: Local python web server problem
In-Reply-To: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
Message-ID: <gmp720$4lv$1@ger.gmane.org>

Farsheed Ashouri wrote:
> Hi everyone. I have started to develop a web base software for
> renderfarm managing.
> I run the cherrypy hello world! example and when I visit
> 127.0.0.1:8080
> on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
> local network is 192.168.100.18
> but when I visit 192.168.100.18, there is another page: "It Works!".
> What is "It Works!"? and when I type 192.168.100.18:8080 in another
> local pc, the page didn't load? [...]

Services like HTTP servers "bind" not only to a port, but to a
combination of IP address and port.

The CherryPy tutorial configuration

http://www.cherrypy.org/browser/trunk/cherrypy/tutorial/tutorial.conf

binds to 127.0.0.1 and 8080. This means the application can only be
accessed from the local machine.

To bind to all network interfaces, (i. e. Ethernet etc., and not just
the loopback device), you can change server.socket_host to "0.0.0.0".

-- Gerhard



From gh at ghaering.de  Mon Feb  9 07:22:56 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:22:56 +0100
Subject: Which core am I running on?
In-Reply-To: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
Message-ID: <gmp76v$4lv$2@ger.gmane.org>

psaffrey at googlemail.com wrote:
> Is there some way I can get at this information at run-time? I'd like
> to use it to tag diagnostic output dumped during runs using Parallel
> Python.

There should be a way, but not with the Python standard library. It's
also platform-specific. What are you using? Linux, MacOS X, FreeBSD,
Solaris, or maybe Windows?

-- Gerhard



From gh at ghaering.de  Mon Feb  9 07:24:23 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 09 Feb 2009 13:24:23 +0100
Subject: Which core am I running on?
In-Reply-To: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
Message-ID: <gmp79n$4lv$3@ger.gmane.org>

psaffrey at googlemail.com wrote:
> Is there some way I can get at this information at run-time? I'd like
> to use it to tag diagnostic output dumped during runs using Parallel
> Python.

Looks like I have answered a similar question once, btw. ;-)

http://objectmix.com/python/631346-parallel-python.html

-- Gerhard



From psaffrey at googlemail.com  Mon Feb  9 08:04:59 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:04:59 -0800 (PST)
Subject: Which core am I running on?
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
	<mailman.9136.1234182305.3487.python-list@python.org>
Message-ID: <84742d3d-6cb5-434b-8a33-2e571e34be70@j1g2000yqi.googlegroups.com>

On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
> Looks like I have answered a similar question once, btw. ;-)
>

Ah, yes - thanks. I did Google for it, but obviously didn't have the
right search term.

Cheers,

Peter


From psaffrey at googlemail.com  Mon Feb  9 08:11:23 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:11:23 -0800 (PST)
Subject: Too many open files
Message-ID: <7cb40acb-fbfe-420c-bc9e-be9765bc8d53@o11g2000yql.googlegroups.com>

I'm building a pipeline involving a number of shell tools. In each
case, I create a temporary file using tempfile.mkstmp() and invoke a
command ("cmd < /tmp/tmpfile") on it using subprocess.Popen.

At the end of each section, I call close() on the file handles and use
os.remove() to delete them. Even so I build up file descriptors that
eventually give me the "too many files" error message. Am I missing
something here?

Peter


From lihang9999 at gmail.com  Mon Feb  9 08:13:10 2009
From: lihang9999 at gmail.com (Li Han)
Date: Mon, 9 Feb 2009 05:13:10 -0800 (PST)
Subject: convert the ip packet to and from RS-232 packet
Message-ID: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>

Hi, I need to use radio to connect two local ip network, each local
network has a server computer which connects to a radio with RS-232
interface.  I need to write a program to convert the local ip packet
into RS-232 packet, so the radio can send packetes to the remote
radio. I don't want to reinvent the wheel, is there anyone could give
me some suggestions?
Thank you!
Han


From eckhardt at satorlaser.com  Mon Feb  9 08:17:21 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 09 Feb 2009 14:17:21 +0100
Subject: Too many open files
References: <7cb40acb-fbfe-420c-bc9e-be9765bc8d53@o11g2000yql.googlegroups.com>
Message-ID: <30n566-q6r.ln1@satorlaser.homedns.org>

psaffrey at googlemail.com wrote:
> I'm building a pipeline involving a number of shell tools. In each
> case, I create a temporary file using tempfile.mkstmp() and invoke a
> command ("cmd < /tmp/tmpfile") on it using subprocess.Popen.
> 
> At the end of each section, I call close() on the file handles and use
> os.remove() to delete them. Even so I build up file descriptors that
> eventually give me the "too many files" error message. Am I missing
> something here?

There recently was a bug filed at bugs.python.org about leaked file
descriptors. Maybe that is exactly what you are experiencing here.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From pobega at gmail.com  Mon Feb  9 08:23:21 2009
From: pobega at gmail.com (Michael Pobega)
Date: Mon, 9 Feb 2009 08:23:21 -0500
Subject: wxPython vs Glade?
Message-ID: <20090209132321.GA30754@greedo>

I'm looking for opinions on the best toolkit for a beginner to use with
wxPython. It doesn't necessarily need to be the most efficient toolkit,
but something I can use for basic programs (a Twitter client, Wordpress
blogging client, etc) just to learn Python.

wxWidgets seems nice because it's portable, but I'm not sure how many of
my libraries are portable (a lot of them seem to import os), while Glade
seems extremely simple to make a UI (but does the program end up relying
on Glade? Or can I build it directly into GTK+?)

-- 
		  http://pobega.wordpress.com
		    http://identica/pobega
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From steve at holdenweb.com  Mon Feb  9 08:29:06 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 09 Feb 2009 08:29:06 -0500
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <gmpb3e$g68$1@ger.gmane.org>

Li Han wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?
> Thank you!

There's a package called pyserial that's pretty good at handling RS-232
interfaces. Good luck!

regards
 Steve
(G3VEK)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From benjamin.kaplan at case.edu  Mon Feb  9 08:30:13 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 9 Feb 2009 08:30:13 -0500
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>

On Mon, Feb 9, 2009 at 8:23 AM, Michael Pobega <pobega at gmail.com> wrote:

> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>


wxPython is the toolkit. It provides Python wrappers for wxWidgets. I think
you are looking at wxGlade, a UI designer for wx based off of the Gnome UI
builder. It's not a toolkit..

>
> --
>                  http://pobega.wordpress.com
>                    http://identica/pobega
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
>
> iEYEARECAAYFAkmQLkkACgkQxgy5R7EobNd/vwCfeDdaeX6YyNxcCZ11pmbWMPZj
> akwAn2LCb3Qz2lLKZLF3DG4j5lTBOQdd
> =/Bfe
> -----END PGP SIGNATURE-----
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at holdenweb.com  Mon Feb  9 08:34:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 09 Feb 2009 08:34:12 -0500
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <gmpbd0$g68$2@ger.gmane.org>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
> 
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
> 
There's something called PythonCard built on top of wxPython that's
fairly newb-friendly, though it gets clunkier as your demands grow.

You might also want to look at Dabo, which is a much more comprehensive
framework that also hides much of wxPython's complexity.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From tim.wintle at teamrubber.com  Mon Feb  9 08:47:18 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 09 Feb 2009 13:47:18 +0000
Subject: thread. question
Message-ID: <1234187238.7630.34.camel@tim-laptop>

Hi, 
This is my first post here - google hasn't helped much but sorry if this
has been asked before.

I've been wondering about some of the technicalities of locks in python
(2.4 and 2.5 mainly).

I'm using the "old" thread module as (1) I prefer the methods and (2) It
should be a tiny bit faster.

As far as I can see, the thread module is fairly much a direct wrapper
around "PyThread_allocate_lock" etc. - defined in
"thread_pthread.h" (took me ages to find the definitions in a header
file!), so as far as I can tell the implementation is very closely
wrapped around the system's threading implementation. 

Does that mean that every python thread is actually a real separate
thread (for some reason I thought they were implemented in the
interpreter)?

Does that also mean that there is very little extra interpreter-overhead
to using locks (assuming they very infrequently block)? Since if you use
the thread module direct the code doesn't seem to escape from C during
the acquire() etc. or am I missing something important?

Thanks,

Tim Wintle






From s.selvamsiva at gmail.com  Mon Feb  9 08:48:48 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Mon, 9 Feb 2009 19:18:48 +0530
Subject: BeautifulSoup -converting unicode to numerical representaion
Message-ID: <b423b9550902090548n48a3c722i526f9b96d155b67a@mail.gmail.com>

Hi all,

I need to parse feeds and post the data to SOLR.I want the special
characters(Unicode char) to be posted as numerical representation,

For eg,
*'* --> &#8217; (for which HTML equivalent is &rsquo;)
I used BeautifulSoup,which seems to be allowing conversion from "&#xxxx;"(
numeric values )to unicode characters as follow,

*hdes=str(BeautifulStoneSoup(strdesc,
convertEntities=BeautifulStoneSoup.HTML_ENTITIES))
xdesc=str(BeautifulStoneSoup(hdes,
convertEntities=BeautifulStoneSoup.XML_ENTITIES))*

But i want *numerical representation of unicode characters.*
I also want to convert html representation like &rsquo; to its numeric
equivalent &#8217;

Thanks in advance.

*Note:*
The reason for the above requirement is i need a standard way to post to
SOLR to avoid errors.
-- 
Yours,
S.Selvam
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From psaffrey at googlemail.com  Mon Feb  9 08:53:10 2009
From: psaffrey at googlemail.com (psaffrey at googlemail.com)
Date: Mon, 9 Feb 2009 05:53:10 -0800 (PST)
Subject: Which core am I running on?
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>
	<mailman.9136.1234182305.3487.python-list@python.org>
Message-ID: <c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>

On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
> http://objectmix.com/python/631346-parallel-python.html
>

Hmm. In fact, this doesn't seem to work for pp. When I run the code
below, it says everything is running on the one core.

import pp
import random
import time
from string import lowercase

ncpus = 3

def timedCharDump(waittime, char):
	time.sleep(waittime)
	mycore = open("/proc/%i/stat" % os.getpid()).read().split()[39]
	print "I'm doing stuff!", mycore, char
	return char

job_server = pp.Server(ncpus, ppservers=())

jobdetails = [ (random.random(), letter) for letter in lowercase ]

jobs = [ job_server.submit(timedCharDump,(jinput1, jinput2), (),
("os", "time",)) for jinput1, jinput2 in jobdetails ]

for job in jobs:
	print job()


Peter


From tino at wildenhain.de  Mon Feb  9 08:54:09 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 09 Feb 2009 14:54:09 +0100
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <49903581.70409@wildenhain.de>

Hi,

Li Han wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?

You might want to check:

http://en.wikipedia.org/wiki/Packet_radio


some free OS already come with an interface
implemention so all you need would be configuring
that interface and routing appropriately.

As such, not really a python topic.

Regards
Tino
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From vzupka at volny.cz  Mon Feb  9 09:05:01 2009
From: vzupka at volny.cz (=?WINDOWS-1252?Q?Vladim=EDr_=8Eupka?=)
Date: Mon, 9 Feb 2009 15:05:01 +0100
Subject: cannot install
Message-ID: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>

I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python  
3.0 into a folder (/Library/Frameworks/Python.framework) and ran  
commands:

cd /Library/Frameworks/Python.framework/Python-3.0
python setup.py install

and got the message reporting a syntax error:

Macintosh:~ vzupka$ /bin/csh
[Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
[Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python  
setup.py install
   File "setup.py", line 232
     except (CCompilerError, DistutilsError) as why:
                                              ^
SyntaxError: invalid syntax
[Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%

What is the reason and how do I install?

Regards,
Vladim?r ?upka
vzupka at volny.cz





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From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:10:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:10:13 -0200
Subject: Small socket problem
References: <200902090943.36445.research@johnohagan.com>
Message-ID: <op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 07:43:36 -0200, John O'Hagan <research at johnohagan.com>  
escribi?:

> I'm using the socket module (python 2.5) like this (where 'options'  
> refers to
> an optparse object) to connect to the Fluidsynth program:
>
>             host = "localhost"
>             port = 9800
>             fluid = socket(AF_INET, SOCK_STREAM)
>             try:
>                 fluid.connect((host, port))  #Connect if fluidsynth is  
> running
>             except BaseException:
>                 print "Connecting to fluidsynth..." #Or start fluidsynth
>                 soundfont =  options.soundfont
>                 driver = options.driver
>                 Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
>                 "-C", "1",  "-R", "1", "-l", "-a", driver, "-j",  
> soundfont])
>                 timeout = 50
>                 while 1:
>                     timeout -= 1
>                     if timeout == 0:
>                         print "Problem with fluidsynth: switching to  
> synth."
>                         play_method = "synth"
>                         break
>                     try:
>                         fluid.connect((host, port))
>                     except BaseException:
>                         sleep(0.05)
>                         continue
>                     else:
>                         break
>
> (I'm using BaseException because I haven't been able to discover what
> exception class[es] socket uses).

Usually socket.error, which is a subclass of IOError, but others might  
happen too I think. In any case, the most generic except clause you should  
use is
try:
except Exception: ...
(because you usually don't want to catch KeyboardInterrupt nor SystemExit,  
that is, let Ctrl-C and sys.exit() do their work)

> The problem is that this fails to connect ( the error is "111: Connection
> refused") the first time I run it after booting if fluidsynth is not  
> already
> running, no matter how long the timeout is; after Ctrl-C'ing out of the
> program, all subsequent attempts succeed. Note that fluidsynth need not  
> be
> running for a success to occur.

Always the same exception? In both lines?

-- 
Gabriel Genellina



From pobega at gmail.com  Mon Feb  9 09:26:55 2009
From: pobega at gmail.com (Michael Pobega)
Date: Mon, 9 Feb 2009 09:26:55 -0500
Subject: wxPython vs Glade?
In-Reply-To: <ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>
References: <20090209132321.GA30754@greedo>
	<ec96e1390902090530y459a9553u9cb5cfac1b631e1b@mail.gmail.com>
Message-ID: <20090209142655.GA25349@greedo>

On Mon, Feb 09, 2009 at 08:30:13AM -0500, Benjamin Kaplan wrote:
> On Mon, Feb 9, 2009 at 8:23 AM, Michael Pobega <pobega at gmail.com> wrote:
> 
> > I'm looking for opinions on the best toolkit for a beginner to use with
> > wxPython. It doesn't necessarily need to be the most efficient toolkit,
> > but something I can use for basic programs (a Twitter client, Wordpress
> > blogging client, etc) just to learn Python.
> >
> > wxWidgets seems nice because it's portable, but I'm not sure how many of
> > my libraries are portable (a lot of them seem to import os), while Glade
> > seems extremely simple to make a UI (but does the program end up relying
> > on Glade? Or can I build it directly into GTK+?)
> >
> 
> wxPython is the toolkit. It provides Python wrappers for wxWidgets. I think
> you are looking at wxGlade, a UI designer for wx based off of the Gnome UI
> builder. It's not a toolkit..
> 

No, I'm not. You don't have to argue semantics with me; I'm talking
about using wxPython directly (i.e. with Vim) or using Glade to build an
interface; I'm wondering which makes for the easiest and best end result
code.

-- 
		  http://pobega.wordpress.com
		    http://identica/pobega
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From Scott.Daniels at Acm.Org  Mon Feb  9 09:30:29 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 09 Feb 2009 06:30:29 -0800
Subject: MacPython 2.5 IDLE font size
In-Reply-To: <JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>
References: <541cb78b-52fd-4f71-9909-5649d4586558@v42g2000yqj.googlegroups.com>
	<JPednaRWYrCXsBLUnZ2dnUVZ_r-dnZ2d@pdx.net>
Message-ID: <k6adnT4jqdgWoA3UnZ2dnUVZ_vWdnZ2d@pdx.net>

I (Scott David Daniels) wrote:
> chohazel at gmail.com wrote:
>> Is there a way to adjust the default font size in IDLE, in MacPython
>> 2.5? The default now is too tiny.
>> I have to use this version of MacPython. As far as I searched, I can't
>> find how I do this.
> 
> If you can read what you have at all, try to go toHelp (on the top),
> then down in that menu to "Configure IDLE ..."
> There will be a possibly long delay.  Then on the tab in the produced
> window, You can set the Base Editor Font and Size.  I use Tahoma 14.
> Then go click "Ok".  If the display doesn't get better, you might have
> to exit from Idle and restart it.  If this doesn't work, get back to me
> and we can try something more drastic.

Although the OP seems no longer interested,  I'd now advise anyone
interested yo read the entire section on installing VPython (v5) on
OS/X.  It has a very clear set of things to do to get Python 2.5 and
IDLE working.  You can simply skip the steps for downloading and
installing VPython if you like.
     http://www.vpython.org/contents/download_mac.html

As to why it is on vpython.org rather than python.org, VPython is used
in physics courses at a number of universities, and they teach their
classes (to people not necessarily programmers) using IDLE to interact
with and program their physics demos (3-D images that you can mouse
around to change your point of view).

--Scott David Daniels
Scott.Daniels at Acm.Org


From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:34:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:34:13 -0200
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <op.uo29fbpbx6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 08:03:06 -0200, Joel Ross <joelc at cognyx.com> escribi?:

> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
>
>
> def readLines():
>
>          for line in file.read():
>              if not line: break
>              print line + '.com '
>              return line
>
>
>
> readLines()
> file.close()
>
> ##########################################################################
>
> It returns the results:
>
> t.com
>
> NOTE: Only returns the first letter of the first word on the first line  
> e.g. test would only print t and readline() does the same thing.

This should print every line in the file, adding .com at the end:

wordList = "/tmp/Wordlist"
with open(wordList, 'r') as wl:
   for line in wl:
     print line.rstrip() + '.com '

Note that:
- I iterate over the file self; files are their own line-iterators.
- I've used the 'r' mode instead (I assume it's a text file because you  
read it line by line, and as you don't update it, the '+' isn't required)
- the line read includes the end-of-line '\n' at the end; rstrip() removes  
it and any trailing whitespace. If you don't want this, use rstrip('\n')
- I've used the with statement to ensure the file is closed at the end


-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb  9 09:34:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 12:34:14 -0200
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <op.uo29fcsnx6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 08:03:06 -0200, Joel Ross <joelc at cognyx.com> escribi?:

> #########################################################################
>
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
>
>
> def readLines():
>
>          for line in file.read():
>              if not line: break
>              print line + '.com '
>              return line
>
>
>
> readLines()
> file.close()
>
> ##########################################################################
>
> It returns the results:
>
> t.com
>
> NOTE: Only returns the first letter of the first word on the first line  
> e.g. test would only print t and readline() does the same thing.

This should print every line in the file, adding .com at the end:

wordList = "/tmp/Wordlist"
with open(wordList, 'r') as wl:
   for line in wl:
     print line.rstrip() + '.com '

Note that:
- I iterate over the file self; files are their own line-iterators.
- I've used the 'r' mode instead (I assume it's a text file because you  
read it line by line, and as you don't update it, the '+' isn't required)
- the line read includes the end-of-line '\n' at the end; rstrip() removes  
it and any trailing whitespace. If you don't want this, use rstrip('\n')
- I've used the with statement to ensure the file is closed at the end


-- 
Gabriel Genellina



From icanbob at gmail.com  Mon Feb  9 09:43:28 2009
From: icanbob at gmail.com (bobicanprogram)
Date: Mon, 9 Feb 2009 06:43:28 -0800 (PST)
Subject: convert the ip packet to and from RS-232 packet
References: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <4cc1a15a-9d20-4b85-ab04-2380cab5b23a@s20g2000yqh.googlegroups.com>

On Feb 9, 8:13 am, Li Han <lihang9... at gmail.com> wrote:
> Hi, I need to use radio to connect two local ip network, each local
> network has a server computer which connects to a radio with RS-232
> interface.  I need to write a program to convert the local ip packet
> into RS-232 packet, so the radio can send packetes to the remote
> radio. I don't want to reinvent the wheel, is there anyone could give
> me some suggestions?
> Thank you!
> Han


You might want to check out the SIMPL toolkit. (http://
www.icanprogram.com/simpl).   It come standard with an RS232
surrogate.   This generic module will transparently transmit a SIMPL
message via RS232 serial connection.   Although this module is written
in C,  SIMPL itself fully supports Python as a language to create
modules.

bob


From basu at archlinux.us  Mon Feb  9 09:43:46 2009
From: basu at archlinux.us (member Basu)
Date: Mon, 9 Feb 2009 09:43:46 -0500
Subject: Py2app Py2exe and losing extensibility
Message-ID: <c620ff2d0902090643j4a671bb9ka59ba009d800f8b7@mail.gmail.com>

I'm currently working on a project that allows users to write their own
Python modules as simple extensions (basically output formatters). I would
like to do a cross-platform release and so I'm using PyQt and will be trying
to convert it to native builds using Py2app and Py2xe. I don't want users to
have to install Qt and PyQt to run it. But if I do that, will I still be
able to load Python modules dynamically as extensions ? (assuming that the
user machine has Python installed separately).
Thanks,
Basu
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From bieffe62 at gmail.com  Mon Feb  9 09:54:49 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 9 Feb 2009 06:54:49 -0800 (PST)
Subject: thread. question
References: <mailman.9145.1234188653.3487.python-list@python.org>
Message-ID: <d99327ba-5afa-4f86-925f-e8958b57f577@h20g2000yqn.googlegroups.com>

On Feb 9, 2:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> Hi,
> This is my first post here - google hasn't helped much but sorry if this
> has been asked before.
>
> I've been wondering about some of the technicalities of locks in python
> (2.4 and 2.5 mainly).
>
> I'm using the "old" thread module as (1) I prefer the methods and (2) It
> should be a tiny bit faster.
>
> As far as I can see, the thread module is fairly much a direct wrapper
> around "PyThread_allocate_lock" etc. - defined in
> "thread_pthread.h" (took me ages to find the definitions in a header
> file!), so as far as I can tell the implementation is very closely
> wrapped around the system's threading implementation.
>
> Does that mean that every python thread is actually a real separate
> thread (for some reason I thought they were implemented in the
> interpreter)?
>

I've hever seen the C implementation of python thread, but I know that
python threads
are real OS threads, not 'green threads' inside the interpreter.


> Does that also mean that there is very little extra interpreter-overhead
> to using locks (assuming they very infrequently block)? Since if you use
> the thread module direct the code doesn't seem to escape from C during
> the acquire() etc. or am I missing something important?
>

One significant difference with doing threads in lower level languages
is that in Python the single interpreter instructions
are atomic. This make things a bit safer but also less reactive. It is
especially bad if you use C modules which have function
calls which take long time (bit AFAIK most of IO standard modules have
work around for it),
because your program will not change thread until the C function
returns.
The reason - or one of the reasons - for this is that the python
threads share the interpreter, which is locked
by a thread before execution of a statement and released at the end
(  this is the 'Global Interpreter Lock' or GIL of
which you probably found many references if you googled for python
threads ). Among the other things, this seem to mean that
a multi-threaded python application cannot take full advantage of
multi-core CPUs (but the detailed reason for that escapes me...).

For these reasons, on this list, many suggest that if you have real-
time requirements, probably you should consider using
sub-processes instead of threads.
Personally I have used  threads a few times, although always with
very  soft real-time requirements, and I have never been bitten by the
GIL (meaning that anyway I was able top meet my timing requirements).
So, to add another achronym to my post, YMMV.


> Thanks,
>
> Tim Wintle

Ciao
----
FB


From lists at cheimes.de  Mon Feb  9 09:59:05 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 15:59:05 +0100
Subject: thread. question
In-Reply-To: <1234187238.7630.34.camel@tim-laptop>
References: <1234187238.7630.34.camel@tim-laptop>
Message-ID: <gmpgbp$60o$1@ger.gmane.org>

Tim Wintle schrieb:
> Hi, 
> This is my first post here - google hasn't helped much but sorry if this
> has been asked before.
> 
> I've been wondering about some of the technicalities of locks in python
> (2.4 and 2.5 mainly).
> 
> I'm using the "old" thread module as (1) I prefer the methods and (2) It
> should be a tiny bit faster.

You shouldn't use the thread module directly. It's not meant to be used
by a user. Please stick to the threading module. You won't notice a
slowdown, trust me :)

> As far as I can see, the thread module is fairly much a direct wrapper
> around "PyThread_allocate_lock" etc. - defined in
> "thread_pthread.h" (took me ages to find the definitions in a header
> file!), so as far as I can tell the implementation is very closely
> wrapped around the system's threading implementation. 

The header files Python/thread_*.h contain the interface to your
system's threading libraries. One of the files is included conditionally
depending on your OS.

> Does that mean that every python thread is actually a real separate
> thread (for some reason I thought they were implemented in the
> interpreter)?

Yes, Python uses native threads, not green threads. However Python pure
code can't utilize more than one CPU per process. On order to use
multiple CPUs you have to use multiple processes or use C code that
doesn't use any Python API. Google for "GIL" if you are interested in
more information.

> Does that also mean that there is very little extra interpreter-overhead
> to using locks (assuming they very infrequently block)? Since if you use
> the thread module direct the code doesn't seem to escape from C during
> the acquire() etc. or am I missing something important?

You are correct. The overhead is minimal.

Christian



From exarkun at divmod.com  Mon Feb  9 10:02:06 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:02:06 -0500
Subject: convert the ip packet to and from RS-232 packet
In-Reply-To: <31cea4a8-5223-427b-b05d-41dd46508a04@p2g2000prf.googlegroups.com>
Message-ID: <20090209150206.12853.1379007984.divmod.quotient.7849@henry.divmod.com>

On Mon, 9 Feb 2009 05:13:10 -0800 (PST), Li Han <lihang9999 at gmail.com> wrote:
>Hi, I need to use radio to connect two local ip network, each local
>network has a server computer which connects to a radio with RS-232
>interface.  I need to write a program to convert the local ip packet
>into RS-232 packet, so the radio can send packetes to the remote
>radio. I don't want to reinvent the wheel, is there anyone could give
>me some suggestions?

You can proxy between any two kinds of connection pretty easily with
Twisted (untested):

    from twisted.internet import serialport, protocol, reactor
    from twisted.protocols import portforward

    class SerialPortServer(portforward.Proxy):
        def connectionMade(self):
            # Stop the server, since only one thing can talk to the serial port
            # at a time.
            tcpPort.stopListening()

            # Hook up the proxy between this TCP connection and the serial port.
            self.peer = portforward.Proxy()
            self.peer.setPeer(self)
            self._serialPort = serialport.SerialPort(self.peer, '/dev/ttyS0', reactor)

    factory = protocol.ServerFactory()
    factory.protocol = SerialPortServer
    tcpPort = reactor.listenTCP(12345, factory)
    reactor.run()

Jean-Paul


From jasiu85 at gmail.com  Mon Feb  9 10:02:28 2009
From: jasiu85 at gmail.com (Jasiu)
Date: Mon, 9 Feb 2009 07:02:28 -0800 (PST)
Subject: version in setup.cfg
Message-ID: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>

Hi guys,

I have a question about setup.py and setup.cfg:

I work in a company and we use Subversion to keep our stuff. We have a
post-commit rule that does the following: whenever there is a commit
to /tags/ directory, a binary package is built automatically. The
tag's name is the new version of the package, i.e. tag names are
something like /tags/1.5.2, /tags/1.2.3 etc. We use setup.py to create
packages. In setup.py we set the version of the package by specifying
'version' keyword argument to setup function. We have automated builds
and our post-commit script does kind of ugly regexp hack and replaces
string "version='...'" with version that is guessed from the tag name.
And I wonder: It would be much cleaner if the version could be placed
in the setup.cfg file. Is that possible?

Thanks,

Mike


From gagsl-py2 at yahoo.com.ar  Mon Feb  9 10:14:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 09 Feb 2009 13:14:17 -0200
Subject: Py2app Py2exe and losing extensibility
References: <c620ff2d0902090643j4a671bb9ka59ba009d800f8b7@mail.gmail.com>
Message-ID: <op.uo3a931rx6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 12:43:46 -0200, member Basu <basu at archlinux.us>  
escribi?:

> I'm currently working on a project that allows users to write their own
> Python modules as simple extensions (basically output formatters). I  
> would
> like to do a cross-platform release and so I'm using PyQt and will be  
> trying
> to convert it to native builds using Py2app and Py2xe. I don't want  
> users to
> have to install Qt and PyQt to run it. But if I do that, will I still be
> able to load Python modules dynamically as extensions ? (assuming that  
> the
> user machine has Python installed separately).

I don't know about py2app but if you use py2exe your users still can  
provide their own modules. And they don't have to install Python  
separately (asuming that your "private" one contains all the library  
modules they want to use)
I don't understand your concerns about installing Qt/PyQt.

-- 
Gabriel Genellina



From exarkun at divmod.com  Mon Feb  9 10:24:47 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:24:47 -0500
Subject: Small socket problem
In-Reply-To: <200902090943.36445.research@johnohagan.com>
Message-ID: <20090209152447.12853.1924354689.divmod.quotient.7857@henry.divmod.com>

On Mon, 9 Feb 2009 09:43:36 +0000, John O'Hagan <research at johnohagan.com> wrote:
>Hi,
>
>I'm using the socket module (python 2.5) like this (where 'options' refers to
>an optparse object) to connect to the Fluidsynth program:
>
>            host = "localhost"
>            port = 9800
>            fluid = socket(AF_INET, SOCK_STREAM)
>            try:
>                fluid.connect((host, port))  #Connect if fluidsynth is running
>            except BaseException:
>                print "Connecting to fluidsynth..." #Or start fluidsynth
>                soundfont =  options.soundfont
>                driver = options.driver
>                Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
>                "-C", "1",  "-R", "1", "-l", "-a", driver, "-j", soundfont])
>                timeout = 50
>                while 1:
>                    timeout -= 1
>                    if timeout == 0:
>                        print "Problem with fluidsynth: switching to synth."
>                        play_method = "synth"
>                        break
>                    try:
>                        fluid.connect((host, port))
>                    except BaseException:
>                        sleep(0.05)
>                        continue
>                    else:
>                        break
>
>(I'm using BaseException because I haven't been able to discover what
>exception class[es] socket uses).
>
>The problem is that this fails to connect ( the error is "111: Connection
>refused") the first time I run it after booting if fluidsynth is not already
>running, no matter how long the timeout is; after Ctrl-C'ing out of the
>program, all subsequent attempts succeed. Note that fluidsynth need not be
>running for a success to occur.

The most obvious problem is that you're trying to re-use a socket on which
a connection attempt has failed.  This isn't allowed and will always fail.
You must create a new socket for each connection attempt.

You might also want to consider using a higher level socket library than
the "socket" module.  The socket module exposes you to lots of very low
level details and platform-specific idiosyncrasies.  You may find that a
library like Twisted (<http://twistedmatrix.com/>) will let you write
programs with fewer bugs.

Jean-Paul


From tim.wintle at teamrubber.com  Mon Feb  9 10:34:02 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 09 Feb 2009 15:34:02 +0000
Subject: thread. question
In-Reply-To: <gmpgbp$60o$1@ger.gmane.org>
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
Message-ID: <1234193642.7630.63.camel@tim-laptop>

Thanks for both replies,

On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
> You shouldn't use the thread module directly. It's not meant to be used
> by a user. Please stick to the threading module. You won't notice a
> slowdown, trust me :)
I'm aware that thread is being renamed to _thread in python 3.0, but is
it being depricated or anything like that?

This is for an app that has been running for quite a long time and it's
now time for fairly heavy optimisations as load is increasing (Believe
me, I wouldn't have been looking at the C otherwise) - so I'll see if I
do notice any effect with threading.

<snip>
> Yes, Python uses native threads, not green threads. However Python pure
> code can't utilize more than one CPU per process. On order to use
> multiple CPUs you have to use multiple processes or use C code that
> doesn't use any Python API. Google for "GIL" if you are interested in
> more information.

Thanks for the info - I'm very aware of the GIL, but had never looked at
the implementation before and for some reason thought that python's
threads were in userspace.

I'm already using a multiple-process architecture overall, but using
threads to avoid waiting when handling SQL and TCP.

Tim




From exarkun at divmod.com  Mon Feb  9 10:42:16 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 10:42:16 -0500
Subject: thread. question
In-Reply-To: <1234193642.7630.63.camel@tim-laptop>
Message-ID: <20090209154216.12853.415160543.divmod.quotient.7862@henry.divmod.com>

On Mon, 09 Feb 2009 15:34:02 +0000, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>Thanks for both replies,
>
>On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
>> You shouldn't use the thread module directly. It's not meant to be used
>> by a user. Please stick to the threading module. You won't notice a
>> slowdown, trust me :)
>I'm aware that thread is being renamed to _thread in python 3.0, but is
>it being depricated or anything like that?
>
>This is for an app that has been running for quite a long time and it's
>now time for fairly heavy optimisations as load is increasing (Believe
>me, I wouldn't have been looking at the C otherwise) - so I'll see if I
>do notice any effect with threading.

You may want to look into dropping the use of threads (where possible,
eg for handling TCP connections) if you're trying to optimize the app.
Threads come with a lot of overhead that can be avoided by using non-
blocking operations instead.

Jean-Paul


From benjamin.kaplan at case.edu  Mon Feb  9 10:56:14 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 9 Feb 2009 10:56:14 -0500
Subject: cannot install
In-Reply-To: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
Message-ID: <ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>

On Mon, Feb 9, 2009 at 9:05 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:

> I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python 3.0
> into a folder (/Library/Frameworks/Python.framework) and ran commands:
>
> cd /Library/Frameworks/Python.framework/Python-3.0
> python setup.py install
>
> and got the message reporting a syntax error:
>
> Macintosh:~ vzupka$ /bin/csh
> [Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python setup.py
> install
>   File "setup.py", line 232
>     except (CCompilerError, DistutilsError) as why:
>                                              ^
> SyntaxError: invalid syntax
> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%
>
> What is the reason and how do I install?
>


You can't use setup.py because the python 2.5 on your system (or 2.6 if you
installed it) is incompatible with Python 3 modules. You need to compile
Python 3 yourself. It will then automatically call setup.py to create all
the extension modules.

Just unpack the tarball anywhere and use the following commands  Python 3 is
automatically installed as python3.0, so you don't need to worry about
overwriting the default python on the system.

./configure --enable-framework
make
sudo make install

more complete instructions are in the Mac/README file, except substitute
"Python 3.0" everywhere it says "MacPython 2.6". You will probably need to
install a whole bunch of packages to compile it. configure will tell you
about them. MacPorts (www.macports.org) and fink (www.finkproject.org)
provide an easy way to get them.


> Regards,
> Vladim?r ?upka
> vzupka at volny.cz
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From anthra.norell at bluewin.ch  Mon Feb  9 11:29:25 2009
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 09 Feb 2009 17:29:25 +0100
Subject: Simple question - stock market simulation
In-Reply-To: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
Message-ID: <499059E5.7000301@bluewin.ch>

cptn.spoon wrote:
> I'm trying to create an incredibly simple stock market simulator to be
> used in a childrens classroom and I'm wondering whether someone can
> point me in the right direction.
>
> I basically want to be able to have a stock struct as follows:
>
> StockName = "Test"
> StockPriceList = (12,13,12,10,10,8,10)
> StockRisk = 0.15
> StockQty = 2000
>
> And then have a StockMarket struct that can contain 1 to many Stocks.
> I then want to be able to iterate through the stocks to perform
> operations as such:
>
> for Stock in StockMarket:
>
> I'm not asking for tips on the program itself, I just can't figure out
> how to get the data structures in place. Would I use Classes or would
> I use dictionaries? Am I completely off the mark with this?
>
> Apologies for such a rudimentary question...I'm very new to all this.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
If the subject is investment performance, surely your best bet is to 
hand out piggy banks.

Frederic







From bdesth.quelquechose at free.quelquepart.fr  Mon Feb  9 11:37:09 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 09 Feb 2009 17:37:09 +0100
Subject: wxPython vs Glade?
In-Reply-To: <mailman.9138.1234185807.3487.python-list@python.org>
References: <mailman.9138.1234185807.3487.python-list@python.org>
Message-ID: <49906950$0$24811$426a34cc@news.free.fr>

Michael Pobega a ?crit :
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython.


wxPython *is* a GUI toolkit (or, more exactly, a python binding for 
wxWidgets).

> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os),  while Glade
> seems extremely simple to make a UI

Glade is a (graphical) GUI *builder* for the GTK+ toolkit - it' not a 
toolkit itself. So you're comparing apples to gorillas.

FWIW, there is (was ???) a Glade-like graphical builder for wxWidgets 
named wxGlade.




From Krzysztof.Retel at googlemail.com  Mon Feb  9 11:39:08 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Mon, 9 Feb 2009 08:39:08 -0800 (PST)
Subject: Network packets processor advice
Message-ID: <76830d52-9b0f-4e78-adc3-999bb125d472@p13g2000yqc.googlegroups.com>

Hi,

I am wrting a network packet processor. The processor listens on a
specific port for incomming UDP or TCP packets. When the packet
arrives it has to parse it, store in DB and if this succeed it has to
acknowledge the packet to the client. Now the problem is that I want
to have a control over possible failures of the system. For instance,
if the DB is gone, the processor should stop working and restart when
DB is back to live.

So the questions are:
1. Which approach is the best for building such software? For instance
using threads?
2. I can use the 'monit' tool for monitorig processes. However, not
sure yet how to start a python script with a specific process id. Is
it possible at all?
3. Any other suggestions?

Cheers,
K


From remm1 at member.fsf.org  Mon Feb  9 11:45:59 2009
From: remm1 at member.fsf.org (Rob)
Date: Mon, 09 Feb 2009 10:45:59 -0600
Subject: Local python web server problem
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.09.16.45.58.976303@member.fsf.org>

> I run the cherrypy hello world! example and when I visit
> 127.0.0.1:8080
> on firefox, a nice "Hello World" appears. I am on ubuntu and my ip in
> local network is 192.168.100.18
> but when I visit 192.168.100.18, there is another page: "It Works!".
> What is "It Works!"? and when I type 192.168.100.18:8080 in another
> local pc, the page didn't load?

You need to have the server listen on 192.168.100.18 not 127.0.0.1. 
They are different.  127.0.0.1 is visible only locally. The
192.168.100.18 is visible both locally and from other hosts.

I don't use cherrypy so don't know how you set this up.  Are you using
apache to host cherrypy or does it have it's own web server? If your using
apache the IP address is selected with the Listen directive normally in
the /etc/apache2/ports.conf file.

> Thanks and sorry for my bad English.
Your english is good.

Rob



From hall.jeff at gmail.com  Mon Feb  9 11:52:03 2009
From: hall.jeff at gmail.com (hall.jeff at gmail.com)
Date: Mon, 9 Feb 2009 08:52:03 -0800 (PST)
Subject: easy_install
References: <7f00694b-a956-440d-92f5-99db48925829@l1g2000yqj.googlegroups.com>
	<6v88eaFifbroU1@mid.uni-berlin.de>
	<4c020f9a-d179-4153-9815-9a32c54a7d2e@f3g2000yqf.googlegroups.com>
	<498F285B.6060905@v.loewis.de>
Message-ID: <d202ced3-da02-4fda-8815-821067e45be8@l16g2000yqo.googlegroups.com>

I had it downloaded and sitting in the root c:\ but didn't get it to
run because I didn't think about the \scripts folder not being in the
Path. Problem solved and fixed. Thank you all for your help.

On a side note, "easy_install MySQL-python" produced the following
messages:
Searching for MySQL-python
Reading http://pypi.python.org/simple/MySQL_python/
Reading http://sourceforge.net/projects/mysql-python
Reading http://sourceforge.net/projects/mysql-python/
Best match: MySQL-python 1.2.3b1
Downloading http://osdn.dl.sourceforge.net/sourceforge/mysql-python/MySQL-python-1.2.3b1.tar.gz
Processing MySQL-python-1.2.3b1.tar.gz
Running MySQL-python-1.2.3b1\setup.py -q bdist_egg --dist-dir c:
\docume~1\jhall\locals~1\temp\easy_install-t_ph9k\MySQL-
python-1.2.3b1\egg-dist-tmp-3gtuz9
error: The system cannot find the file specified

installing from the hard drive worked fine, however.


From xahlee at gmail.com  Mon Feb  9 11:55:35 2009
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 9 Feb 2009 08:55:35 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <b0f033d9-62c3-487b-a869-cef5664b0ba5@r15g2000prh.googlegroups.com>

Xah Lee wrote:
> ...
> if you want software engineering books, i suggest try some books that
> are based on statistical survey, as opposed to some dignitary's
> ?opinion? or current fashion & trends that comes with a jargon. These
> type of books are a dime a dozen, every year, they come and go. The
> stastical survey approach takes major understaking and cost. The
> opinion type any motherfucking ?guru? can write. e.g. Paul Graham has
> you buy into certain concept of ?hackers? fucker and claim they are
> like ?painters?. Certain Gabriel wants you to believe in poetry and C
> is the last language. (see Book Review: Patterns of
> Software
> http://xahlee.org/PageTwo_dir/Personal_dir/bookReviewRichardGabriel.html
> ) et al. Certain Gosling wants you to believe Java is the last lang on
> earth that'll wipe out Microsoft (circa 1998).
>
> ...
>
> ... what society overwhelmingly asks for is snake oil. Of course, the
> snake oil has the most impressive names ?otherwise you would be
> selling nothing? like ?Structured Analysis and Design?, ?Software
> Engineering?, ?Maturity Models?, ?Management Information Systems?,
> ?Integrated Project Support Environments? ?Object Orientation? and
> ?Business Process Re-engineering? (the latter three being known as
> IPSE, OO and BPR, respectively).? ? Edsger W Dijkstra (1930-2002), in
> EWD 1175: The strengths of the academic enterprise.
>
> you want to be a good programer? Study math, the math of programing,
> and master the langs and protocols and tools you use. You want to
> climb the tech industry ladder? get better at people, learn politics.
> You want to be rich? Study business. Chances are, you are a coding
> geek, and at heart you dna is not geared to be interested in politics
> or business, and you'll never be rich or big ceo just because of that.
>
> See also:
> ? Why Software Suck
>  http://xahlee.org/UnixResource_dir/writ/why_software_suck.html
>
> looking at the eXtreme Programing fuckheads's traffic history:
> http://groups.google.com/group/comp.software.extreme-programming/about
>
> for those who are not aware, it was one of the snake oil wildly
> popular in around 2001.

Today, i happened to run across a blog on the eXtreme Programing FUCK.

http://www.yosefk.com/blog/extreme-programming-explained.html

Great article!

  Xah
? http://xahlee.org/

?


From aahz at pythoncraft.com  Mon Feb  9 12:02:58 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 Feb 2009 09:02:58 -0800
Subject: Calling into Python from a C thread
References: <mailman.8619.1233597806.3487.python-list@python.org>
Message-ID: <gmpnk2$nhr$1@panix3.panix.com>

[posted & e-mailed]

In article <mailman.8619.1233597806.3487.python-list at python.org>,
Philip Semanchuk  <philip at semanchuk.com> wrote:
>
>I'm trying call Python from inside of a C thread that's running in a  
>Python extension I've written and I am not having much luck. My C  
>thread function consists of simply this, and I get a segmentation  
>fault from Python:

Because it's been a week without response, I suggest you try the capi
mailing list.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From tn.pablo at gmail.com  Mon Feb  9 12:07:07 2009
From: tn.pablo at gmail.com (ptn)
Date: Mon, 9 Feb 2009 09:07:07 -0800 (PST)
Subject: Flattening lists
References: <mailman.8874.1233839954.3487.python-list@python.org> 
	<873aesbzng.fsf@agentultra.com>
	<mailman.8917.1233860847.3487.python-list@python.org>
Message-ID: <e7880494-8a3b-44ed-9ab2-5d34d0cd73d0@33g2000yqm.googlegroups.com>

On Feb 5, 2:07?pm, rdmur... at bitdance.com wrote:
> Quoth J Kenneth King <ja... at agentultra.com>:
>
>
>
> > mk <mrk... at gmail.com> writes:
>
> > > Hello everybody,
>
> > > Any better solution than this?
>
> > > def flatten(x):
> > > ? ? res = []
> > > ? ? for el in x:
> > > ? ? ? ? if isinstance(el,list):
> > > ? ? ? ? ? ? res.extend(flatten(el))
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? res.append(el)
> > > ? ? return res
>
> > > a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
> > > print flatten(a)
>
> > > [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> > > Regards,
> > > mk
>
> >http://mail.python.org/pipermail/python-list/2005-July/330367.html
>
> That's worth reading. ?I'm not sure why I'm finding this fun, but who
> cares. ?I tried a couple of other functions after reading that article,
> and it looks like a generator that scans the nested lists is actually
> the winner, and also is in many ways the most elegant implementation.
> Of course, as noted in the emails following above article, the test data
> is really inadequate for proper optimization testing ;)
>
> -----------------------------------------------------------------
> from __future__ import print_function
> from timeit import Timer
> from itertools import chain
>
> # This is the one from the article quoted above.
> def flatten6(seq):
> ? ? i = 0
> ? ? while (i != len(seq)):
> ? ? ? ? while hasattr(seq[i], '__iter__'):
> ? ? ? ? ? ? seq[i:i+1] = seq[i]
> ? ? ? ? i = i + 1
> ? ? return seq
>
> #This is my favorite from a readability standpoint out of
> #all the things I tried. ?It also performs the best.
> def flatten8(seq):
> ? ? for x in seq:
> ? ? ? ? if not hasattr(x, '__iter__'): yield x
> ? ? ? ? else:
> ? ? ? ? ? ? for y in flatten8(x):
> ? ? ? ? ? ? ? ? yield y
>
> l = [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
>
> if __name__=="__main__":
> ? ? print(l)
> ? ? print('flatten6', flatten6(l))
> ? ? print('flatten8', list(flatten8(l)))
> ? ? print('flatten6', Timer("flatten6(l)", "from temp3 import flatten6, l").timeit())
> ? ? print('flatten8', Timer("list(flatten8(l))", "from temp3 import flatten8, l").timeit())
>
> -----------------------------------------------------------------
>
> >src/python/Python-3.0/python temp3.py
>
> [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
> flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten6 32.8386368752
> flatten8 30.7509689331
>
> >python temp3.py
>
> [[1, 2, 3], 5, [7, 8], 3, [9, [10, 11, 12], 4, [9, [10, 5, 7]], 1, [[[[[5, 4], 3], 4, 3], 3, 1, 45], 9], 10]]
> flatten6 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten8 [1, 2, 3, 5, 7, 8, 3, 9, 10, 11, 12, 4, 9, 10, 5, 7, 1, 5, 4, 3, 4, 3, 3, 1, 45, 9, 10]
> flatten6 34.730714798
> flatten8 32.3252940178
>
> --RDM

I think the generator is clearer with a try statement, like in Magnus
Lie Hetland's solution from Beginning Python:

def flatten(nested):
    try:
        # Don't iterate over string-like objs.
        try: nested + ''
        except TypeError: pass
        else: raise TypeError
        for sub in nested:
            for elem in flatten(sub):
                yield elem
    except TypeError:
        # The for doesn't work for single elements.
        yield nested

You can't iterate over string-like objs because the all strings are
built of infinite empty lists at the beginning, leading to infinite
recursion.


From aleksandr.goretoy at gmail.com  Mon Feb  9 12:07:50 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Mon, 9 Feb 2009 11:07:50 -0600
Subject: GAE read binary file into db.BlobProperty()
Message-ID: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>

How to read Binary file into GAE(Google App Engine) db.BlobProperty()
datastore?

-Alex Goretoy
http://www.goretoy.com
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From aahz at pythoncraft.com  Mon Feb  9 12:10:04 2009
From: aahz at pythoncraft.com (Aahz)
Date: 9 Feb 2009 09:10:04 -0800
Subject: Threading / Queue management
References: <a852a388-2e3f-4b45-aa80-695fc116ecfc@v18g2000pro.googlegroups.com>
Message-ID: <gmpo1c$pft$1@panix3.panix.com>

In article <a852a388-2e3f-4b45-aa80-695fc116ecfc at v18g2000pro.googlegroups.com>,
Power Button  <mjbuchan at gmail.com> wrote:
>
>I wonder if anyone can help with the following. I have written a
>script which polls a server and if it finds and pending orders, it
>instantiates an new object (foo) - in a new thread and processes some
>data. In the new object (foo), there are also some long running
>processes so I am trying to create a thread pool/queue and to push
>items onto the queue in the instantiated object (foo). Currently I am
>creating the Queue in foo but this means I am starting up 5 new
>threads every time I instantiate foo. What I want to be able to do is
>create the Queue and start 5 (n) threads when my program starts and
>then push items onto the queue in foo.

Not sure what you're trying to do, but you meay find this sample code
useful:

http://www.pythoncraft.com/OSCON2001/index.html
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From remm1 at member.fsf.org  Mon Feb  9 12:10:18 2009
From: remm1 at member.fsf.org (Rob)
Date: Mon, 09 Feb 2009 11:10:18 -0600
Subject: global name 'sqrt' is not defined
References: <mailman.8845.1233824962.3487.python-list@python.org>
Message-ID: <pan.2009.02.09.17.10.17.947284@member.fsf.org>

> Any ideas?  If I do something like "import math" in the subfunction, 
> then the error changes to "global name 'math' is not defined".

Presumably ipython does an import so you need to import it yourself
something like:

from math import sqrt

at the top of your source file.  I don't know why math would not be
defined, it's built in -- probably a scoping logic problem in your code. 
Put the form/import statement at the top of your module file (as is
usually done), not inside a function or other block.

Rob



From bdesth.quelquechose at free.quelquepart.fr  Mon Feb  9 12:12:14 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 09 Feb 2009 18:12:14 +0100
Subject: Help needed to retrieve text from a text-file using RegEx
In-Reply-To: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <49907188$0$7875$426a34cc@news.free.fr>

Oltmans a ?crit :
> Here is the scenario:
> 
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
> 
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
> 
> -------------
> 
> So now if I run the program and user enters
> 
> DecConnector
> 
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
> 
>  with open('MyTextFile.txt') 

This will lookup for MyFile.txt in the system's current working 
directory - which is not necessarily in the script's directory.

>  as file:

this shadows the builtin's 'file' symbol.

>                 for line in file:
> 
>                     if mName in line: #mName is the string that
> contains user input

> 
>                         Path =str(line).strip('\n')

'line' is already a string.

>                         tempStr=Path
> 
>                         Path=tempStr.replace(mName+'=',"",1)

You don't need the temporary variable here. Also, you may want to use 
str.split instead:


# NB : renaming for conformity to
# Python's official naming conventions

# 'name' => what the user looks for
# 'path_to_file' => fully qualified path to the 'database' file

target = "%s=" % name # what we are really looking for

with open(path_to_file) as the_file:
     for line in the_file:
         # special bonus : handles empty lines and 'comment' lines
         # feel free to comment out the thre following lines if
         # you're sure you don't need them !-)
         line = line.strip()
	if not line or line.startswith('#') or line.startswith(';'):
             continue

         # faster and simpler than a regexp
         if line.startswith(target):
             # since the '=' is in target, we can safely assume
             # that line.split('=') will return at least a
             # 2-elements list
             path = line.split('=')[1]
             # no need to look further
             break
     else:
         # target not found...
         path = None



> I was wondering if using RegEx will make this look better.

I don't think so. Really.


From rolf.oltmans at gmail.com  Mon Feb  9 12:22:32 2009
From: rolf.oltmans at gmail.com (Oltmans)
Date: Mon, 9 Feb 2009 09:22:32 -0800 (PST)
Subject: Help needed to retrieve text from a text-file using RegEx
Message-ID: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>

Here is the scenario:

It's a command line program. I ask user for a input string. Based on
that input string I retrieve text from a text file. My text file looks
like following

Text-file:
-------------
AbcManager=C:\source\code\Modules\Code-AbcManager\
AbcTest=C:\source\code\Modules\Code-AbcTest\
DecConnector=C:\source\code\Modules\Code-DecConnector\
GHIManager=C:\source\code\Modules\Code-GHIManager\
JKLConnector=C:\source\code\Modules\Code-JKLConnector

-------------

So now if I run the program and user enters

DecConnector

Then I'm supposed to show them this text "C:\source\code\Modules\Code-
DecConnector" from the text-file. Right now I'm retrieving using the
following code which seems quite ineffecient and inelegant at the same
time

 with open('MyTextFile.txt') as file:

                for line in file:

                    if mName in line: #mName is the string that
contains user input

                        Path =str(line).strip('\n')

                        tempStr=Path

                        Path=tempStr.replace(mName+'=',"",1)

I was wondering if using RegEx will make this look better. If so, can
you please suggest a Regular Expression for this? Any help is highly
appreciated. Thank you.


From gabriel.rossetti at arimaz.com  Mon Feb  9 12:24:12 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 09 Feb 2009 18:24:12 +0100
Subject: poplib
Message-ID: <499066BC.6020900@arimaz.com>

Hello,

I am using poplib and I noticed that calls to top() don't return the msg 
info (2nd index in the returned list, e.g. email.top(1,0)[1]) in the 
same order, by that I mean the date could be email.top(1,0)[1][2] or 
email.top(1,0)[1][5], etc. Is there a reason for that other than that 
may be how the server is sending them? Why not re-order them and send 
back a list that always had the date as element n or even better a dict?

Thank you,
Gabriel


From philip at semanchuk.com  Mon Feb  9 12:28:50 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 9 Feb 2009 12:28:50 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <20090209170259.1D4C78FDE0@panix3.panix.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>
	<20090209170259.1D4C78FDE0@panix3.panix.com>
Message-ID: <BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>


On Feb 9, 2009, at 12:02 PM, Aahz wrote:

> [posted & e-mailed]
>
> In article <mailman.8619.1233597806.3487.python-list at python.org>,
> Philip Semanchuk  <philip at semanchuk.com> wrote:
>>
>> I'm trying call Python from inside of a C thread that's running in a
>> Python extension I've written and I am not having much luck. My C
>> thread function consists of simply this, and I get a segmentation
>> fault from Python:
>
> Because it's been a week without response, I suggest you try the capi
> mailing list.

I didn't know there *was* such a thing. Thanks for the tip! For those  
who might be interested, the list is here:
http://mail.python.org/mailman/listinfo/capi-sig


FYI, I got my code working and it is in the latest release of posix_ipc:
http://semanchuk.com/philip/posix_ipc/

The function MessageQueue_request_notification() does some necessary  
setup and the function process_notification() does the rest of the work.


Cheers
Philip




From jonathan.wright at gmail.com  Mon Feb  9 12:36:48 2009
From: jonathan.wright at gmail.com (Jon)
Date: Mon, 9 Feb 2009 09:36:48 -0800 (PST)
Subject: How to use buildout with a scripts directory?
Message-ID: <8e1e9045-593d-4e99-8f8f-05353ef96879@o36g2000yqh.googlegroups.com>

Hello,

I am trying to use buildout and am having trouble to figure out how to
get it to install the scripts that come with a package. They are
present inside the egg which is installed by buildout, but they don't
end up in the bin directory. After running buildout my bin directory
is empty, but I can find:

.\eggs\imaged11-1.2.3-py2.5-win32.egg\EGG-INFO\scripts\peaksearch.py

In the package I have a directory (ImageD11) with the library stuff in
it and a directory named "scripts" with the scripts. When I use
distutils or setuptools it does what I expected:

setup.py:
...
setup(name='ImageD11',
      ...,
      packages = ["ImageD11"],
      package_dir = {"ImageD11":"ImageD11"},
     scripts = [ "scripts/peaksearch.py",
                    "scripts/bgmaker.py",
                    ...]
     )



c:\testImageD11distutils\> python setup.py install
...
Installing peaksearch.py script to c:\python25\Scripts
Installing bgmaker.py script to c:\python25\Scripts

Now I am wondering how to persuade "buildout" to do the same thing,
but place those scripts into it's own little area.

In buildout.cfg I have:
==================
[buildout]
parts = ImageD11

[ImageD11]
recipe = zc.recipe.egg:scripts
scripts = scripts/peaksearch.py
eggs = ImageD11
version = 1.2.3


It seems to acknowledge that scripts/peaksearch.py is requested, but
doesn't seem to do anything about it. My scripts mostly just map
command line arguments to function calls, something like this:

if __name__=="__main__":
    import ImageD11.something, sys
    ImageD11.something.do_something_interesting( sys.argv[1], sys.argv
[2] )

I've read the documentation at http://pypi.python.org/pypi/zc.buildout
several times but I still can't figure out how to make these scripts
part of the build. There seems to be a lot of talk about entry_points,
but I'm blocked on those as to what is the entry point for an if
__name__=="__main__": idiom?

Thanks in advance for any help!

Jon





From clp2 at rebertia.com  Mon Feb  9 12:40:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 09:40:57 -0800
Subject: Help needed to retrieve text from a text-file using RegEx
In-Reply-To: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902090940o462ee90er978adddbdeb5983d@mail.gmail.com>

On Mon, Feb 9, 2009 at 9:22 AM, Oltmans <rolf.oltmans at gmail.com> wrote:
> Here is the scenario:
>
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
>
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
>
> -------------
>
> So now if I run the program and user enters
>
> DecConnector
>
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
>
>  with open('MyTextFile.txt') as file:
>
>                for line in file:
>
>                    if mName in line: #mName is the string that
> contains user input
>
>                        Path =str(line).strip('\n')
>
>                        tempStr=Path
>
>                        Path=tempStr.replace(mName+'=',"",1)
>
> I was wondering if using RegEx will make this look better. If so, can
> you please suggest a Regular Expression for this? Any help is highly
> appreciated. Thank you.

If I might repeat Jamie Zawinski's immortal quote:
    Some people, when confronted with a problem, think "I know, I'll
use regular expressions." Now they have two problems.

If you add one section header (e.g. "[main]") to the top of the file,
you'll have a valid INI-format file which can be parsed by the
ConfigParser module --
http://docs.python.org/library/configparser.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From castironpi at gmail.com  Mon Feb  9 12:46:26 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Mon, 9 Feb 2009 09:46:26 -0800 (PST)
Subject: generator object or 'send' method?
Message-ID: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>

Hello,

I am writing a generator to return a sequence of numbers with some
variation.  The parameters of the variation can be changed by the
caller, even after the generator is started.  My question is, is it
better to wrap the generator in an object, so that the parameters can
be changed just by an attribute access?  Or keep the generator clear,
and modify parameters with a 'send' call?

P.S.  It would receive the 'send' from a different point in control
flow than its usual 'next'.  Should it repeat a value if it receives a
'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
generator?

Thanks sincerely as always.


From todpose at hotmail.com  Mon Feb  9 13:09:26 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Mon, 9 Feb 2009 10:09:26 -0800
Subject: Putting asterisks around text
Message-ID: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>


I'm trying to write a program that puts asterisks around the input text using while loop.
I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From darcy at druid.net  Mon Feb  9 13:20:46 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 9 Feb 2009 13:20:46 -0500
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
Message-ID: <20090209132046.091f5b8a.darcy@druid.net>

On Mon, 9 Feb 2009 10:09:26 -0800
"todpose at hotmail.com" <todpose at hotmail.com> wrote:
> I'm trying to write a program that puts asterisks around the input text using while loop.
> I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********

while understand_problem is False:
    study("textbook")

complete("homework")

if want_help is True:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From google at mrabarnett.plus.com  Mon Feb  9 13:40:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 09 Feb 2009 18:40:05 +0000
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <49907885.2000902@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Mon, 9 Feb 2009 10:09:26 -0800
> "todpose at hotmail.com" <todpose at hotmail.com> wrote:
>> I'm trying to write a program that puts asterisks around the input text using while loop.
>> I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
> 
> while understand_problem is False:
>     study("textbook")
> 
> complete("homework")
> 
> if want_help is True:
>     study("http://www.catb.org/~esr/faqs/smart-questions.html")
> 
That's not Pythonic, and you shouldn't use "is" except when checking for
identity. The recommended style is:

     while not understand_problem:
         study("textbook")

     complete("homework")

     if want_help:
         study("http://www.catb.org/~esr/faqs/smart-questions.html")

See how much clearer that is? ;-)


From rdmurray at bitdance.com  Mon Feb  9 13:51:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 9 Feb 2009 18:51:07 +0000 (UTC)
Subject: Help needed to retrieve text from a text-file using RegEx
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <gmptuq$tu0$1@ger.gmane.org>

Oltmans <rolf.oltmans at gmail.com> wrote:
> Here is the scenario:
> 
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
> 
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
> 
> -------------
> 
> So now if I run the program and user enters
> 
> DecConnector
> 
> Then I'm supposed to show them this text "C:\source\code\Modules\Code-
> DecConnector" from the text-file. Right now I'm retrieving using the
> following code which seems quite ineffecient and inelegant at the same
> time
> 
>  with open('MyTextFile.txt') as file:
>      for line in file:
>          if mName in line: #mName is the string that contains user input
>              Path =str(line).strip('\n')
>              tempStr=Path
>              Path=tempStr.replace(mName+'=',"",1)

I've normalized your indentation and spacing, for clarity.

> I was wondering if using RegEx will make this look better. If so, can
> you please suggest a Regular Expression for this? Any help is highly
> appreciated. Thank you.

This smells like it might be homework, but I'm hoping you'll learn some
useful python from what follows regardless of whether it is or not.

Since your complaint is that the above code is inelegant and inefficient,
let's clean it up.  The first three lines that open the file and set up
your loop are good, and I think you will agree that they are pretty clean.
So, I'm just going to help you clean up the loop body.

'line' is already a string, since it was read from a file.  No need to
wrap it in 'str':

              Path = line.strip('\n')
              tempStr=Path
              Path=tempStr.replace(mName+'=',"",1)

'strip' removes characters from _both_ ends of the string.  If you are
trying to make sure that you _only_ strip a trailing newline, then you
should be using rstrip.  If, on the other hand, you just want to get
rid of any leading or trailing whitespace, you could just call 'strip()'.
Since your goal is to print the text from after the '=', I'll assume
that stripping whitespace is desirable:

              Path = line.strip()
              tempStr=Path
              Path=tempStr.replace(mName+'=',"",1)

The statement 'tempStr=Path' doesn't do what you think it does.
It just creates an alternate name for the string pointed to by Path.
Further, there is no need to have an intermediate variable to hold a
value during transformation.  The right hand side is computed, using
the current values of any variables mentioned, and _then_ the left hand
side is rebound to point to the result of the computation.  So we can
just drop that line entirely, and use 'Path' in the 'replace' statement:

              Path = line.strip()
              Path = Path.replace(mName+'=',"",1)

However, you can also chain method calls, so really there's no need for
two statements here, since both calls are simple:

              Path = line.strip().replace(mName+'=',"",1)

To make things even simpler, Python has a 'split' function.  Given the
syntax of your input file I think we can assume that '=' never appears
in a variable name.  split returns a list of strings constructed by
breaking the input string at the split character, and it has an optional
argument that gives the maximum number of splits to make.  So by doing
'split('=', 1), we will get back a list consisting of the variable name
and the remainder of the line.  The remainder of the line is exactly
what you are looking for, and that will be the second element of the
returned list.  So now your loop body is:

              Path = line.strip().split('=', 1)[1]

and your whole loop looks like this:

    with open('MyTextFile.txt') as file:
        for line in file:
            if mName in line:
                Path = line.strip().split('=', 1)[1]

I think that looks pretty elegant.  Oh, and you might want to add a
'break' statement to the loop, and also an 'else:' clause (to the for
loop) so you can issue a 'not found' message to the user if they type
in a name that does not appear in the input file.

--RDM



From ptmcg at austin.rr.com  Mon Feb  9 13:59:22 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 9 Feb 2009 10:59:22 -0800 (PST)
Subject: Help needed to retrieve text from a text-file using RegEx
References: <532dd150-9889-41d9-a926-adffa8934393@y1g2000pra.googlegroups.com>
Message-ID: <6a0e4184-26c1-4ea1-bd81-452c7332abbf@i38g2000yqd.googlegroups.com>

On Feb 9, 11:22?am, Oltmans <rolf.oltm... at gmail.com> wrote:
> Here is the scenario:
>
> It's a command line program. I ask user for a input string. Based on
> that input string I retrieve text from a text file. My text file looks
> like following
>
> Text-file:
> -------------
> AbcManager=C:\source\code\Modules\Code-AbcManager\
> AbcTest=C:\source\code\Modules\Code-AbcTest\
> DecConnector=C:\source\code\Modules\Code-DecConnector\
> GHIManager=C:\source\code\Modules\Code-GHIManager\
> JKLConnector=C:\source\code\Modules\Code-JKLConnector
>

Assuming the text-file is in the under-30Mb size, I would just read
the whole thing into a dict at startup, and then use the dict over and
over.

data = file(filename).read()
lookup = dict( line.split('=',1) for line in data.splitlines() if
line )

# now no further need to access text file, just use lookup variable

while True:
    user_entry = raw_input("Lookup key: ").strip()
    if not user_entry:
        break
    if user_entry in lookup:
        print lookup[user_entry]
    else:
        print "No entry for '%s'" % user_entry


From rodmena.com at gmail.com  Mon Feb  9 14:01:08 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Mon, 9 Feb 2009 11:01:08 -0800 (PST)
Subject: Local python web server problem
References: <30b0923c-313d-4626-8df2-2f877ae9f47a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.09.16.45.58.976303@member.fsf.org>
Message-ID: <c139d0cc-0d62-44d3-9bc0-799719831409@i38g2000yqd.googlegroups.com>

Thanks guys, Really appreciate your help. I am trying to solve the
problem and will keep you posted when I found a solution.

Farsheed Ashouri,
Tehran, Iran


From todpose at hotmail.com  Mon Feb  9 14:09:49 2009
From: todpose at hotmail.com (todpose at hotmail.com)
Date: Mon, 9 Feb 2009 11:09:49 -0800
Subject: Putting asterisks around text
Message-ID: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>




From: todpose at hotmail.comTo: python-list at python.orgSubject: Putting asterisks around textDate: Mon, 9 Feb 2009 10:09:26 -0800

I'm trying to write a program that puts asterisks around the input text using while loop.I can do this without using while loop, but how can you do that using while loop?Example:Enter a string: Hello world***********Hello world***********
 
I'm not necessarily asking for an answer. A hint would be grateful as well.
_________________________________________________________________
So many new options, so little time. Windows Live Messenger.
http://www.microsoft.com/windows/windowslive/messenger.aspx
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From digitig at gmail.com  Mon Feb  9 14:18:19 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 9 Feb 2009 19:18:19 +0000
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>
References: <BAY121-W385A99AEC098718455AA4FB9BC0@phx.gbl>
Message-ID: <aee48b3c0902091118s4cd72fnf2437d3a0c2689d3@mail.gmail.com>

2009/2/9 todpose at hotmail.com <todpose at hotmail.com>:

> I'm not necessarily asking for an answer. A hint would be grateful as well.

Great. Well, first you need to read:
http://www.catb.org/~esr/faqs/smart-questions.html

Especially the section on "Before you ask".

Then you should be able to give us a question that shows that you've
tried and aren't just wanting us to do your work for you, and that
gives us a clear idea of where your sticking point is so we can
address the sticking point instead of the whole assignment.

Like: How fo you do it without using a while loop? (Yes, *I* know how
to do it without using a while loop, but to help you we need to know
what *you* know). Like: do you understand what a while loop does? And
so on.

We're a pretty friendly bunch in here, but most of us believe in
"tough love" (http://en.wikipedia.org/wiki/Tough_love).

-- 
Tim Rowe


From python.list at tim.thechases.com  Mon Feb  9 14:22:25 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 09 Feb 2009 13:22:25 -0600
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <49908271.9020703@tim.thechases.com>

D'Arcy J.M. Cain wrote:
> On Mon, 9 Feb 2009 10:09:26 -0800
> "todpose at hotmail.com" <todpose at hotmail.com> wrote:
>> I'm trying to write a program that puts asterisks around the
>> input text using while loop.
>> I can do this without using while loop, but how can you do
>> that using while loop?
>> Example:Enter a string: Hello world***********Hello world***********
> 
> while understand_problem is False:
>     study("textbook")
> complete("homework")

This implies global state is changed, and that it holds a literal 
False rather than a False-ish value.  It also doesn't make _good_ 
use of c.l.p so I'd recommend

   smart_qs = "http://www.catb.org/~esr/faqs/smart-questions.html"
   todpose = Newb()
   todpose.study(textbook)
   code = todpose.make_coding_attempt()
   works = test(code)
   while not (todpose.understand_problem() and works):
     if works:
       todpose.study([code, textbook])
     else:
       try:
         while not passes(todpose.question, smart_qs):
           todpose.study([
             smart_qs,
             textbook,
             "www.google.com",
             "docs.python.org",
             ])
         # Note:  consult_clp() expects a valid
         # code object and a smart-question
         consult_clp(code, todpose.question)
       except EpiphanyException:
         code = todpose.make_coding_attempt()
         works = test(code)
         continue
   todpose.hand_in(teacher, code)

-tkc








From tjreedy at udel.edu  Mon Feb  9 14:22:52 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 09 Feb 2009 14:22:52 -0500
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <gmpvqa$5o3$1@ger.gmane.org>

Aaron Brady wrote:
> Hello,
> 
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started.  My question is, is it
> better to wrap the generator in an object, so that the parameters can
> be changed just by an attribute access?

Rather than wrap a generator, I would just write an iterator class.
A generator function is basically an abbreviated class statement.  (The 
abbreviation is the removal of boilerplate code.)

 > Or keep the generator clear, and modify parameters with a 'send' call?

If I were modifying a single parameter and wanted the next value 
returned immediately upon sending, I would do this.

> P.S.  It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
> generator?

But for this I would go with the class.  Pretty foolproof.

tjr



From stef.mientki at gmail.com  Mon Feb  9 14:29:30 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:29:30 +0100
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <4990841A.8070507@gmail.com>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>
>   
there's XRC and something even easier:
http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
cheers,
Stef



From stef.mientki at gmail.com  Mon Feb  9 14:31:25 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:31:25 +0100
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <4990848D.7030505@gmail.com>

Gary Herron wrote:
> rantingrick wrote:
>> I want to build a 3D CAD visualization program with Python. Now before
>> you say this is not possible with Python here me out :)
>>
>> I know OpenGL is probably my best bet BUT i want something a little
>> higher level than that. I am not ready for OpenGL yet.  I would like a
>> kit that is just above OpenGL and abstracts away all the finer
>> details, but not too much higher. VPython is a great kit but it is way
>> too high level for what i want. Here is a list of kits i am currently
>> looking at so if anybody can offer suggestions i would very much like
>> the information. Most of these are dedicated game engines but this is
>> all i can find
>>
>> Panda 3D
>> OGRE
>> Soya 3D
>> VTK
>> Cystal Space
>> CG Kit
>> SciPy
>>   
>
Maya ?
Blender ?

cheers,
Stef



From stef.mientki at gmail.com  Mon Feb  9 14:33:57 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 09 Feb 2009 20:33:57 +0100
Subject: Best 3d graphics kit for CAD program???
In-Reply-To: <498F1D54.9010509@islandtraining.com>
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
Message-ID: <49908525.7070203@gmail.com>

Gary Herron wrote:
> rantingrick wrote:
>> I want to build a 3D CAD visualization program with Python. Now before
>> you say this is not possible with Python here me out :)
>>
>> I know OpenGL is probably my best bet BUT i want something a little
>> higher level than that. I am not ready for OpenGL yet.  I would like a
>> kit that is just above OpenGL and abstracts away all the finer
>> details, but not too much higher. VPython is a great kit but it is way
>> too high level for what i want. Here is a list of kits i am currently
>> looking at so if anybody can offer suggestions i would very much like
>> the information. Most of these are dedicated game engines but this is
>> all i can find
>>
>> Panda 3D
>> OGRE
>> Soya 3D
>> VTK
>> Cystal Space
>> CG Kit
>> SciPy
>>   
>
I forgot:
pySoy
Intensity

cheers,
Stef



From lists at cheimes.de  Mon Feb  9 14:35:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 20:35:14 +0100
Subject: Calling into Python from a C thread
In-Reply-To: <BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>
	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
Message-ID: <gmq0hi$8gv$1@ger.gmane.org>

Philip Semanchuk wrote:
> I didn't know there *was* such a thing. Thanks for the tip! For those
> who might be interested, the list is here:
> http://mail.python.org/mailman/listinfo/capi-sig
> 
> 
> FYI, I got my code working and it is in the latest release of posix_ipc:
> http://semanchuk.com/philip/posix_ipc/
> 
> The function MessageQueue_request_notification() does some necessary
> setup and the function process_notification() does the rest of the work.

Let me guess. You either forgot to start Python's threading system or
you didn't register you thread with Python. You need to deal with
PyThread_init_thread(), PyEval_InitThreads(), PyThreadState_New(),
PyThreadState_Clear() and PyThreadState_DeleteCurrent(). The module
Modules/threadmodule.c contains some examples.

Christian



From kyosohma at gmail.com  Mon Feb  9 14:38:50 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 9 Feb 2009 11:38:50 -0800 (PST)
Subject: wxPython vs Glade?
References: <mailman.9138.1234185807.3487.python-list@python.org>
Message-ID: <1f2f07c0-fc91-42b1-8d3b-b9fa7e0c37e6@f3g2000yqf.googlegroups.com>

On Feb 9, 7:23?am, Michael Pobega <pob... at gmail.com> wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
>
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)
>
> --
> ? ? ? ? ? ? ? ? ?http://pobega.wordpress.com
> ? ? ? ? ? ? ? ? ? ?http://identica/pobega
>
> ?signature.asc
> < 1KViewDownload

I usually just hand-code my apps in IDLE or Wing IDE. I recommend
joining the official wxPython mailing list regardless of what you pick
though as you'll likely pick up a LOT of helpful tips and tricks
there.

Mike


From mdemenko at gmail.com  Mon Feb  9 14:43:42 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Mon, 09 Feb 2009 20:43:42 +0100
Subject: py2exe and distutils
In-Reply-To: <mailman.9105.1234125632.3487.python-list@python.org>
References: <gmk5o8$g34$00$1@news.t-online.com>	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
	<mailman.9105.1234125632.3487.python-list@python.org>
Message-ID: <4990876E.5080800@gmail.com>

Gabriel Genellina schrieb:
> En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net> 
> escribi?:
> 
>>> Maxim Demenko schrieb:
>>>> Hi,
>>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 
>>>> 0.6.9
>>>> Now i can't list installed modules, here is the stacktrace:
>> [...]
>>>> Any suggestion, how to fix this issue?
>>>
>> Thomas Heller schrieb:
>>> Looks like a setuptools problem to me.  Here's the output on my system:
>>
>> Actually, I don't know where the problem is.  Maybe pydoc?
> 
> Yes, pydoc isn't robust enough in 2.5; see 
> <http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788> 
> for a quick fix.
> 

Thank you Gabriel, that works nicely.

Best regards

Maxim


From mdemenko at gmail.com  Mon Feb  9 14:43:42 2009
From: mdemenko at gmail.com (Maxim Demenko)
Date: Mon, 09 Feb 2009 20:43:42 +0100
Subject: py2exe and distutils
In-Reply-To: <mailman.9105.1234125632.3487.python-list@python.org>
References: <gmk5o8$g34$00$1@news.t-online.com>	<6v69nnFi8bmqU1@mid.individual.net>
	<6v69rkFi8bmqU2@mid.individual.net>
	<mailman.9105.1234125632.3487.python-list@python.org>
Message-ID: <4990876E.5080800@gmail.com>

Gabriel Genellina schrieb:
> En Sat, 07 Feb 2009 18:39:19 -0200, Thomas Heller <theller at python.net> 
> escribi?:
> 
>>> Maxim Demenko schrieb:
>>>> Hi,
>>>> i have installed Python 2.5.4 on WinXP, setuptools-0.6c9 and py2exe 
>>>> 0.6.9
>>>> Now i can't list installed modules, here is the stacktrace:
>> [...]
>>>> Any suggestion, how to fix this issue?
>>>
>> Thomas Heller schrieb:
>>> Looks like a setuptools problem to me.  Here's the output on my system:
>>
>> Actually, I don't know where the problem is.  Maybe pydoc?
> 
> Yes, pydoc isn't robust enough in 2.5; see 
> <http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d07c1f7bdb49b94/1bdd47421061c788#1bdd47421061c788> 
> for a quick fix.
> 

Thank you Gabriel, that works nicely.

Best regards

Maxim


From deets at nospam.web.de  Mon Feb  9 14:59:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 09 Feb 2009 20:59:16 +0100
Subject: version in setup.cfg
In-Reply-To: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
References: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
Message-ID: <6vbg8kFj8k12U1@mid.uni-berlin.de>

Jasiu schrieb:
> Hi guys,
> 
> I have a question about setup.py and setup.cfg:
> 
> I work in a company and we use Subversion to keep our stuff. We have a
> post-commit rule that does the following: whenever there is a commit
> to /tags/ directory, a binary package is built automatically. The
> tag's name is the new version of the package, i.e. tag names are
> something like /tags/1.5.2, /tags/1.2.3 etc. We use setup.py to create
> packages. In setup.py we set the version of the package by specifying
> 'version' keyword argument to setup function. We have automated builds
> and our post-commit script does kind of ugly regexp hack and replaces
> string "version='...'" with version that is guessed from the tag name.
> And I wonder: It would be much cleaner if the version could be placed
> in the setup.cfg file. Is that possible?

I don't think so. But there are several other options:

  - install pysvn & use that in setup.py to extract the tag from the 
working-copy, making it part of version

  - instead of the dirty hack, use an a little bit less ugly hack to 
write that version to a file in the WC, and open & read that within setup.py

Diez


From lists at cheimes.de  Mon Feb  9 15:02:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 21:02:01 +0100
Subject: thread. question
In-Reply-To: <1234193642.7630.63.camel@tim-laptop>
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
	<1234193642.7630.63.camel@tim-laptop>
Message-ID: <gmq23p$dt3$1@ger.gmane.org>

Tim Wintle schrieb:
> Thanks for both replies,
> 
> On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
>> You shouldn't use the thread module directly. It's not meant to be used
>> by a user. Please stick to the threading module. You won't notice a
>> slowdown, trust me :)
> I'm aware that thread is being renamed to _thread in python 3.0, but is
> it being depricated or anything like that?
> 
> This is for an app that has been running for quite a long time and it's
> now time for fairly heavy optimisations as load is increasing (Believe
> me, I wouldn't have been looking at the C otherwise) - so I'll see if I
> do notice any effect with threading.

[snip]

> Thanks for the info - I'm very aware of the GIL, but had never looked at
> the implementation before and for some reason thought that python's
> threads were in userspace.
> 
> I'm already using a multiple-process architecture overall, but using
> threads to avoid waiting when handling SQL and TCP.

The module was renamed to _thread to stop people from using it directly.
The extension module is the interface to some low level types and
functions. Especially the usage of thread.start_new_thread is
problematic, since it bypasses Python's high level threading API.

For the rest I have to agree with Jean-Paul. If you need performance
don't use threads! Threads and performance are orthogonal -- sometimes
they are even contradictorily.



From andrew at acooke.org  Mon Feb  9 15:07:41 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 9 Feb 2009 17:07:41 -0300 (CLST)
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <c80737c4e49dc894637c7e7db20ba359.squirrel@localhost>


If I were experimenting with Python to see just how far I could push
coroutines at the moment, I would use .send() and look at how I could
factor things into a small library (containing, for example, your
trap-and-response secondary generator).

But if this was paid work, I would write a class with a __next__ method
and do things explicitly.

In answer to your PS, via a roundabout route: I've done something similar
recently by using .throw() to raise an exception in the body of the
generator.  This was done with a reset() function.  So, for example:

  mygen = ...
  a = next(mygen)
  b = next(mygen)
  reset(mygen)
  c = next(mygen)

And in the generator:

  while True:
    try:
      ...
      yield ...
    catch ResetException:
      yield # discarded by the reset function

And finally:

  def reset(gen):
    gen.throw(ResetException())

In that case, I needed an extra "yield" that did nothing.

Andrew


Aaron Brady wrote:
> Hello,
>
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started.  My question is, is it
> better to wrap the generator in an object, so that the parameters can
> be changed just by an attribute access?  Or keep the generator clear,
> and modify parameters with a 'send' call?
>
> P.S.  It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?  Or should I wrap it in a secondary 'trap_send_and_repeat'
> generator?
>
> Thanks sincerely as always.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From rt8396 at gmail.com  Mon Feb  9 15:08:17 2009
From: rt8396 at gmail.com (r)
Date: Mon, 9 Feb 2009 12:08:17 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org>
Message-ID: <fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com>

On Feb 9, 1:33?pm, Stef Mientki <stef.mien... at gmail.com> wrote:

> Maya ?
> Blender ?

> I forgot:
> pySoy
> Intensity

Thanks Stef,
I actually got OpenGL to install(finally) and now i am thinking ?
maybe? i should just go with OpenGL using the wxglcanvas. I have been
also "messing" around with Bender but i think i want a stand alone
application here. I don't know anything about Maya however?

Thanks for the info and feel free to offer more.


From philip at semanchuk.com  Mon Feb  9 15:38:17 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 9 Feb 2009 15:38:17 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <gmq0hi$8gv$1@ger.gmane.org>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>
	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>
	<gmq0hi$8gv$1@ger.gmane.org>
Message-ID: <BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>


On Feb 9, 2009, at 2:35 PM, Christian Heimes wrote:

> Philip Semanchuk wrote:
>> I didn't know there *was* such a thing. Thanks for the tip! For those
>> who might be interested, the list is here:
>> http://mail.python.org/mailman/listinfo/capi-sig
>>
>>
>> FYI, I got my code working and it is in the latest release of  
>> posix_ipc:
>> http://semanchuk.com/philip/posix_ipc/
>>
>> The function MessageQueue_request_notification() does some necessary
>> setup and the function process_notification() does the rest of the  
>> work.
>
> Let me guess. You either forgot to start Python's threading system or
> you didn't register you thread with Python. You need to deal with
> PyThread_init_thread(), PyEval_InitThreads(), PyThreadState_New(),
> PyThreadState_Clear() and PyThreadState_DeleteCurrent(). The module
> Modules/threadmodule.c contains some examples.

Yes, that's accurate except for the word "forgot". To forget something  
one must first know it. =) I found the threading API documentation  
difficult to follow, but I suppose that what I'm doing is a little  
unusual so if it is not well-documented territory, that's what I get  
for wandering off the map.




From denis.spir at free.fr  Mon Feb  9 15:43:31 2009
From: denis.spir at free.fr (spir)
Date: Mon, 9 Feb 2009 21:43:31 +0100
Subject: compound regex
Message-ID: <20090209214331.7e3c0662@o>

Hello,

(new here)

Below an extension to standard module re. The point is to allow writing and testing sub-expressions individually, then nest them into a super-expression. More or less like using a parser generator -- but keeping regex grammar and power.
I used the format {sub_expr_name}: as in standard regexes {} are only used to express repetition number, a pair of curly braces nesting an identifier should not conflict.

The extension is new, very few tested. I would enjoy comments, critics, etc. I would like to know if you find such a feature useful. You will probably find the code simple enough ;-) 

Denis
------
la vida e estranya

===============
# coding: utf-8

''' 	super_regex
	
	Define & check sub-patterns individually,
	then include them in global super-pattern.
	
	uses format {name} for inclusion:
		sub1 = Regex(...)
		sub2 = Regex(...)
		super_format = "...{sub1}...{sub2}..."
		# final regex object:
		super_regex = superRegex(super_format)
	'''

from re import compile as Regex

# sub-pattern inclusion format
sub_pattern = Regex(r"{[a-zA-Z_][a-zA-Z_0-9]*}")

# sub-pattern expander
def sub_pattern_expansion(inclusion, dic=None):
	name = inclusion.group()[1:-1]
	### namespace dict may be specified -- else globals()
	if dic is None:
		dic = globals()
	if name not in dic:
		raise NameError("Cannot find sub-pattern '%s'." % name)
	return dic[name].pattern

# super-pattern generator
def superRegex(format):
	expanded_format = sub_pattern.sub(sub_pattern_expansion, format)
	return Regex(expanded_format)

if __name__ == "__main__": # purely artificial example use
	# pattern
	time = Regex(r"\d\d:\d\d:\d\d")	# hh:mm:ss
	code = Regex(r"\S{5}")			# non-whitespace x 5
	desc = Regex(r"[\w\s]+$")		# alphanum|space --> EOL
	ref_format = "^ref: {time} #{code} --- {desc}"
	ref_regex = superRegex(ref_format)
	# output
	print 'super pattern:\n"%s" ==>\n"%s"\n' % (ref_format,ref_regex.pattern)
	text = "ref: 12:04:59 #%+.?% --- foo 987 bar"
	result = ref_regex.match(text)
	print 'text: "%s" ==>\n"%s"' %(text,result.group())


From fredbasset1000 at gmail.com  Mon Feb  9 15:53:45 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Mon, 9 Feb 2009 12:53:45 -0800 (PST)
Subject: problem with import path on a python C extension
Message-ID: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>

Hi All,

I've written a simple Python extension module in C, but Python is
having problems trying to locate it when I import it into an existing
Python file.  In my example, I wrote a C extension called "diomodule"
which exists in the directory : /root/project/drivers/dio/
diomodule.c.  It has compiled fine and I end up with a diomodule.so
file in that same directory.  I have problems when trying to import it
into another Python file however, e.g. in a file /root/project/daemon/
daemon.py I tried to import it with "import
project.drivers.dio.diomodule".  Python throws an error however when I
try to call one of the functions:

  File "/root/project/daemon/daemon.py", line 115,
in ?
    diomodule.init
()
NameError: name 'diomodule' is not defined

I can only get it to work if I copy the .so file to the directory
where daemon.py is and change the import to "import diomodule".

So my question is why can't Python locate the new extension module
when I try to import it with "import project.drivers.dio.diomodule"?

Thanks for any responses,
Fred


From rantingrick at gmail.com  Mon Feb  9 15:58:44 2009
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 9 Feb 2009 12:58:44 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
Message-ID: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>

Hello all,

It has long been my dream to create an open source 3D CAD program and
i am starting to crawl my way into the first steps. I now believe i am
ready to start this endeavor and i am currently looking for fellow
Python programmers (no matter what skill level) to get started
brainstorming this design.

I have a real good idea of the UI design and at this point i just want
to start simple and build this thing. I figure this will be a good
learning experience for myself and others and in the process i can
realize my dream. And if all this turns out to be is a learning
experience, well nobody lost.

Of course Python will limit the speed here, but at this point i want
to get a template up and running. Speed does not matter at this point,
and optimizations can come along later as i am sure a few complete re-
writes are inevitable :)

My initial start will cover a very simple user interface something
like VPython but much more usable as a CAD modeler. From the start
just a few simple primitives (faces, lines-segments) that will be the
building blocks for more complex models like (arcs, rectangles,
circles, polygons, cubes, spheres, etc..).

There will need to be mouse picking as i see this application as a
very interactive environment. Of course in the beginning all
interaction will most likely be in a command line type manner until
the functionality can be worked out.

There will need to be a hierarchy of instancing and grouping within
the model to facilitate easy transformation of entities within the
model.

I am not too worried about any sort of texturing at this point. I want
to squeeze as much speed as possible and prettiness will come in due
course. I also have no plans for layering, or multiple scenes at this
time. Simple functionality is the end game here.

Once the UI is there and the modeling work flow is worked out,
everything should be a component add-on from there.

So the main points are...

#-- Entities --#
 face
 line-segment

#-- Hierarchy --#
 Entity (one face, or line-segment)
 Group (contained of multiple entities that can be translated,
rotated, scaled as one)
 Instance (component definition)

#-- Tools --#
 line
 rect
 circle
 arc
 select
 rotation
 translation
 scale
 extrusion along path
 measurement


So there it is. Any takers? :)




From lists at cheimes.de  Mon Feb  9 15:59:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 09 Feb 2009 21:59:32 +0100
Subject: Calling into Python from a C thread
In-Reply-To: <BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>	<gmq0hi$8gv$1@ger.gmane.org>
	<BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
Message-ID: <gmq5fk$rdh$1@ger.gmane.org>

Philip Semanchuk wrote:
> Yes, that's accurate except for the word "forgot". To forget something
> one must first know it. =) I found the threading API documentation
> difficult to follow, but I suppose that what I'm doing is a little
> unusual so if it is not well-documented territory, that's what I get for
> wandering off the map.

I see. Apparently the threading and embedding docs don't cover your
case. The docs at
http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock
and http://docs.python.org/extending/embedding.html should explain how
and when to initialize Python threads. Please report a documentation bug
at http://bugs.python.org/.

Christian

PS: I know a great way to learn more about Python's internal threading
CAPI: fix your code, test it and attach a doc patch to your bug report.
*hint* :)



From carsten.haese at gmail.com  Mon Feb  9 16:02:22 2009
From: carsten.haese at gmail.com (Carsten Haese)
Date: Mon, 09 Feb 2009 16:02:22 -0500
Subject: problem with import path on a python C extension
In-Reply-To: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
References: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
Message-ID: <yR0kl.15830$YU2.6573@nlpi066.nbdc.sbc.com>

fredbasset1000 at gmail.com wrote:
> [...]
> So my question is why can't Python locate the new extension module
> when I try to import it with "import project.drivers.dio.diomodule"?
This import statement binds the module to the name
"project.drivers.dio.diomodule". It does not bind anything to the name
"diomodule", which is the name you want to use to refer to the module.

To bind the "diomodule" name to this module, you can do one of two things:

1:
   from project.drivers.dio import diomodule

2:
   import project.drivers.dio.diomodule
   diomodule = project.drivers.dio.diomodule

Hope this helps,

--
Carsten Haese
http://informixdb.sourceforge.net


From carsten.haese at gmail.com  Mon Feb  9 16:08:46 2009
From: carsten.haese at gmail.com (Carsten Haese)
Date: Mon, 09 Feb 2009 16:08:46 -0500
Subject: problem with import path on a python C extension
In-Reply-To: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
References: <b0427bca-743c-43e5-87fa-511003b0733d@f40g2000pri.googlegroups.com>
Message-ID: <zX0kl.15832$YU2.6961@nlpi066.nbdc.sbc.com>

fredbasset1000 at gmail.com wrote:
> I can only get it to work if I copy the .so file to the directory
> where daemon.py is and change the import to "import diomodule".

And to supplement my previous reply, another solution is to make sure
that /root/project/drivers/dio is in your PYTHONPATH. Then you can
simply "import diomodule" and refer to the module by the name "diomodule".

HTH,

--
Carsten Haese
http://informixdb.sourceforge.net


From martin at marcher.name  Mon Feb  9 17:13:57 2009
From: martin at marcher.name (Martin)
Date: Mon, 9 Feb 2009 23:13:57 +0100
Subject: Putting asterisks around text
In-Reply-To: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
Message-ID: <5fa6c12e0902091413s182c07c6jc5c3a3f9b6b0c15c@mail.gmail.com>

Hi,

2009/2/9 todpose at hotmail.com <todpose at hotmail.com>:
> I'm trying to write a program that puts asterisks around the input text
> using while loop.
> I can do this without using while loop, but how can you do that using while
> loop?
>
> Example:
>
> Enter a string: Hello world
>
> **********
> *Hello world*
> **********

Since others have posted so helpful answer I'm just going to rant:

1) http://docs.python.org/ <- first part (make sure you read the docs
-- and tutorial -- for the python version you installed
2) After you know how to store user input in a variable think about
what other facts you know (by examining the content of the variable)
2) Think again hard what you need to output and which parts of the
output need to match the information you already have (by doing point
2)

That shouldn't be too hard

hth
Martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From duane.kaufman at gmail.com  Mon Feb  9 17:49:45 2009
From: duane.kaufman at gmail.com (TheSeeker)
Date: Mon, 9 Feb 2009 14:49:45 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org> 
	<fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com>
Message-ID: <63721531-a4de-4103-92a8-b87933df3b22@o2g2000prl.googlegroups.com>

On Feb 9, 2:08?pm, r <rt8... at gmail.com> wrote:
> On Feb 9, 1:33?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>
> > Maya ?
> > Blender ?
> > I forgot:
> > pySoy
> > Intensity
>
> Thanks Stef,
> I actually got OpenGL to install(finally) and now i am thinking ?
> maybe? i should just go with OpenGL using the wxglcanvas. I have been
> also "messing" around with Bender but i think i want a stand alone
> application here. I don't know anything about Maya however?
>
> Thanks for the info and feel free to offer more.

Hi,

Have you considered OpenCascade:
http://www.opencascade.org/

Along with its python bindings, it might be a good alternative:
http://www.pythonocc.org/

Just a thought,
Duane


From cptn.spoon at gmail.com  Mon Feb  9 17:52:16 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 14:52:16 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com>
	<mailman.9159.1234198554.3487.python-list@python.org>
Message-ID: <746e5493-17c0-4f95-84bf-154bf8655a0c@w39g2000prb.googlegroups.com>

On Feb 10, 3:29?am, Anthra Norell <anthra.nor... at bluewin.ch> wrote:
> cptn.spoon wrote:
> > I'm trying to create an incredibly simple stock market simulator to be
> > used in a childrens classroom and I'm wondering whether someone can
> > point me in the right direction.
>
> > I basically want to be able to have a stock struct as follows:
>
> > StockName = "Test"
> > StockPriceList = (12,13,12,10,10,8,10)
> > StockRisk = 0.15
> > StockQty = 2000
>
> > And then have a StockMarket struct that can contain 1 to many Stocks.
> > I then want to be able to iterate through the stocks to perform
> > operations as such:
>
> > for Stock in StockMarket:
>
> > I'm not asking for tips on the program itself, I just can't figure out
> > how to get the data structures in place. Would I use Classes or would
> > I use dictionaries? Am I completely off the mark with this?
>
> > Apologies for such a rudimentary question...I'm very new to all this.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> If the subject is investment performance, surely your best bet is to
> hand out piggy banks.
>
> Frederic

Thank you all for your advice. It's been most helpful!

Frederic: Haha, it's more to encourage behaviour and risk management
but I agree with your sentiment!


From cptn.spoon at gmail.com  Mon Feb  9 18:10:39 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 15:10:39 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com> 
	<mailman.9129.1234167149.3487.python-list@python.org>
Message-ID: <3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>

On Feb 9, 6:48?pm, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "cptn.spoon" <cp...... at gmail.com> wrote:
>
> On Feb 9, 3:58 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>
> >Thanks Paul! I thought this might be the case. So how would I get the
> >StockMarket class instance to contain many Stock class instances and
> >then be able to iterate through them? I'm guessing the basic structure
> >would be as follows...but I think I'm wrong:
>
> >class StockMarket:
> > ?pass
>
> No.
> At this level, just use a list of instances of your Stock class.
>
> - Hendrik

How do I get a list of instances of a particular class? Is there a way
to do this dynamically?

Also, what would be the way of dynamically creating an instance of a
class based on user input (ie a user wants to create a new instance of
the Stock class via shell input)?

I'm not sure if I have the wrong mindset here.

Thanks for any help
~Phil


From lionel.keene at gmail.com  Mon Feb  9 18:20:05 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 9 Feb 2009 15:20:05 -0800 (PST)
Subject: "Super()" confusion
Message-ID: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>

Hello. I've been scouring the web looking for something to clear up a
little confusion about the use of "super()" but haven't found anything
that really helps. Here's my simple example:


class Parent:
     def __init__(self, filePath):
       .
       .
       Do some processing with "filePath"
       .
       .

class Child(Parent):
     def __init__(self, filePath):
          super(Child,self).__init__(filePath)
          .
          .
          Do some additional Child-specific processing on filePath
          .
          .

As I understand it, "super()" will invoke the initializer of the base
class. There must be something wrong with the above syntax since I'm
getting:

"super(Child,self).__init__(filePath)
TypeError: super() argument 1 must be type, not classobj"

What have I done wrong? Thanks in advance for any help.

L


From robert.kern at gmail.com  Mon Feb  9 18:26:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 09 Feb 2009 17:26:09 -0600
Subject: Simple question - stock market simulation
In-Reply-To: <3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
Message-ID: <gmqe2i$qif$1@ger.gmane.org>

On 2009-02-09 17:10, cptn.spoon wrote:
> On Feb 9, 6:48 pm, "Hendrik van Rooyen"<m... at microcorp.co.za>  wrote:
>> "cptn.spoon"<cp...... at gmail.com>  wrote:
>>
>> On Feb 9, 3:58 pm, Paul Rubin<http://phr... at NOSPAM.invalid>  wrote:
>>
>>> Thanks Paul! I thought this might be the case. So how would I get the
>>> StockMarket class instance to contain many Stock class instances and
>>> then be able to iterate through them? I'm guessing the basic structure
>>> would be as follows...but I think I'm wrong:
>>> class StockMarket:
>>>   pass
>> No.
>> At this level, just use a list of instances of your Stock class.
>>
>> - Hendrik
>
> How do I get a list of instances of a particular class? Is there a way
> to do this dynamically?

You *can*, but I highly recommend that you don't. Instead, just keep your own 
list of instances. When you make a new instance, just append it to the list (see 
below).

   all_stocks = []

> Also, what would be the way of dynamically creating an instance of a
> class based on user input (ie a user wants to create a new instance of
> the Stock class via shell input)?

Define an __init__ method on your class to initialize it from given values. Use 
raw_input() to query the user for information. Convert the text input to 
whatever objects your class needs (e.g. if the user entered "10" on the prompt, 
x=raw_input() will return the string '10', so you would do int(x) to get the 
integer 10). Now, instantiate your class with the arguments:

   the_stock = Stock(name, risk, initial_price)

And append it to your list of stocks.

   all_stocks.append(the_stock)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Mon Feb  9 18:27:18 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 09 Feb 2009 17:27:18 -0600
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <gmqe4m$qif$2@ger.gmane.org>

On 2009-02-09 17:20, Lionel wrote:
> Hello. I've been scouring the web looking for something to clear up a
> little confusion about the use of "super()" but haven't found anything
> that really helps. Here's my simple example:
>
>
> class Parent:
>       def __init__(self, filePath):
>         .
>         .
>         Do some processing with "filePath"
>         .
>         .
>
> class Child(Parent):
>       def __init__(self, filePath):
>            super(Child,self).__init__(filePath)
>            .
>            .
>            Do some additional Child-specific processing on filePath
>            .
>            .
>
> As I understand it, "super()" will invoke the initializer of the base
> class. There must be something wrong with the above syntax since I'm
> getting:
>
> "super(Child,self).__init__(filePath)
> TypeError: super() argument 1 must be type, not classobj"
>
> What have I done wrong? Thanks in advance for any help.

super() only works on the "new-style" classes introduced in Python 2.2. You need 
to make Parent subclass from object:

class Parent(object):
     ...

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb  9 18:58:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 09 Feb 2009 15:58:32 -0800
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <QeCdncJDkuExXw3UnZ2dnUVZ_juWnZ2d@pdx.net>

Lionel wrote:
> Hello. I've been scouring the web looking for something to clear up a
> little confusion about the use of "super()" but haven't found anything
> that really helps. Here's my simple example:
> 
> 
> class Parent:
>      def __init__(self, filePath):...
> 
> class Child(Parent):
>      def __init__(self, filePath):
>           super(Child,self).__init__(filePath)
>           ....
> As I understand it, "super()" will invoke the initializer of the base
> class. There must be something wrong with the above syntax since I'm
> getting:
> "super(Child,self).__init__(filePath)
> TypeError: super() argument 1 must be type, not classobj"
> 
> What have I done wrong? Thanks in advance for any help.

To use super, you must work with descendants of "object".

So, just change your first line to:
     class Parent(object):
and you should find your world back in place.

--Scott David Daniels
Scott.Daniels at Acm.Org


From deets at nospam.web.de  Mon Feb  9 19:01:59 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 10 Feb 2009 01:01:59 +0100
Subject: adodb has no attribute connect
In-Reply-To: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
References: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
Message-ID: <6vbufnFj957sU1@mid.uni-berlin.de>

Rahul schrieb:
> Hello all,
> 
> I have to access data from database using adodb so I did
> 
> Import adodb
> Conn=adodb.NewADOConnection("odbc")
> 
> Upto this it works properly but when I say

It does not. It returns None, thus the following error you see.

> Conn.Connect("","","")
> 
> It gives error as
> 
> [Attributrerror]: Object Nonetype has no attribute Connect.
> 
> I have Red Hat Enterprise Linux 4
> Python 2.5
> Mod_python 3.3.1


According to the docs on the (very old and seemingly not actively 
developed adodb-site), "odbc" needs the Python windows extensions. As 
you are on redheat, I have difficulties believing you make these work.

Maybe mxodbc works? Or even better, ditch that ado-stuff and connect 
directly to your database. Python's DB-API is better I guess, no need 
for this attempt at mimicking windows APIs.

Diez


From exarkun at divmod.com  Mon Feb  9 19:04:05 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 19:04:05 -0500
Subject: "Super()" confusion
In-Reply-To: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
Message-ID: <20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>

On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.keene at gmail.com> wrote:
>Hello. I've been scouring the web looking for something to clear up a
>little confusion about the use of "super()" but haven't found anything
>that really helps. Here's my simple example:
>
> [snip]
>
>"super(Child,self).__init__(filePath)
>TypeError: super() argument 1 must be type, not classobj"
>
>What have I done wrong? Thanks in advance for any help.

Consider whether you really need to use super().

http://fuhm.net/super-harmful/

Jean-Paul


From torriem at gmail.com  Mon Feb  9 19:08:45 2009
From: torriem at gmail.com (Michael Torrie)
Date: Mon, 09 Feb 2009 17:08:45 -0700
Subject: wxPython vs Glade?
In-Reply-To: <20090209132321.GA30754@greedo>
References: <20090209132321.GA30754@greedo>
Message-ID: <4990C58D.5070808@gmail.com>

Michael Pobega wrote:
> I'm looking for opinions on the best toolkit for a beginner to use with
> wxPython. It doesn't necessarily need to be the most efficient toolkit,
> but something I can use for basic programs (a Twitter client, Wordpress
> blogging client, etc) just to learn Python.
> 
> wxWidgets seems nice because it's portable, but I'm not sure how many of
> my libraries are portable (a lot of them seem to import os), while Glade
> seems extremely simple to make a UI (but does the program end up relying
> on Glade? Or can I build it directly into GTK+?)

Glade is very nice for generating GTK guis.  If you save in the newer
format, then GTK has a built-in api called GtkBuilder for importing the
GUI, creating it, and setting up the callbacks.

To be clear, glade-generated ui files work only with GTK, not wxPython.
 If you ever find yourself coding PyQT, the QT Designer is one of the
best GUI builders on the planet.


From lionel.keene at gmail.com  Mon Feb  9 19:18:34 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 9 Feb 2009 16:18:34 -0800 (PST)
Subject: "Super()" confusion
References: mailman.9184.1234224249.3487.python-list@python.org
Message-ID: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>

On Feb 9, 4:04?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
> >Hello. I've been scouring the web looking for something to clear up a
> >little confusion about the use of "super()" but haven't found anything
> >that really helps. Here's my simple example:
>
> > [snip]
>
> >"super(Child,self).__init__(filePath)
> >TypeError: super() argument 1 must be type, not classobj"
>
> >What have I done wrong? Thanks in advance for any help.
>
> Consider whether you really need to use super().
>
> http://fuhm.net/super-harmful/
>
> Jean-Paul

Yes, I came across that essay...and it scared me. Will my base class
initializer always get called regardless of whether or not I use super
()? If so, does this occur prior to any code in my derived class
initializer being executed (in other words, if I don't explicitly call
"super()" in my derived class, am I guaranteed that the base class
"__init__" has executed completely)? If so, then I guess I can forego
the use of "super()"


From clp2 at rebertia.com  Mon Feb  9 19:25:49 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 16:25:49 -0800
Subject: "Super()" confusion
In-Reply-To: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
References: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
Message-ID: <50697b2c0902091625x46eb2a4ejeecb8a9e8c616fb1@mail.gmail.com>

On Mon, Feb 9, 2009 at 4:18 PM, Lionel <lionel.keene at gmail.com> wrote:
> On Feb 9, 4:04 pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
>> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
>> >Hello. I've been scouring the web looking for something to clear up a
>> >little confusion about the use of "super()" but haven't found anything
>> >that really helps. Here's my simple example:
>>
>> > [snip]
>>
>> >"super(Child,self).__init__(filePath)
>> >TypeError: super() argument 1 must be type, not classobj"
>>
>> >What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>>
>> Jean-Paul
>
> Yes, I came across that essay...and it scared me. Will my base class
> initializer always get called regardless of whether or not I use super
> ()?

No, it is not called unless you /explicitly/ call it (either using
super() or manually via BaseClassName.__init__(self, other, args,
here)) in your subclass' __init__ or you don't define an __init__ for
your subclass (and it inherits __init__ from its first superclass).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From exarkun at divmod.com  Mon Feb  9 19:31:37 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 19:31:37 -0500
Subject: "Super()" confusion
In-Reply-To: <884a646e-3ad0-4033-a665-8eb3e7eb566e@f40g2000pri.googlegroups.com>
Message-ID: <20090210003137.12853.1758503199.divmod.quotient.8052@henry.divmod.com>

On Mon, 9 Feb 2009 16:18:34 -0800 (PST), Lionel <lionel.keene at gmail.com> wrote:
>On Feb 9, 4:04?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
>> On Mon, 9 Feb 2009 15:20:05 -0800 (PST), Lionel <lionel.ke... at gmail.com> wrote:
>> >Hello. I've been scouring the web looking for something to clear up a
>> >little confusion about the use of "super()" but haven't found anything
>> >that really helps. Here's my simple example:
>>
>> > [snip]
>>
>> >"super(Child,self).__init__(filePath)
>> >TypeError: super() argument 1 must be type, not classobj"
>>
>> >What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>>
>> Jean-Paul
>
>Yes, I came across that essay...and it scared me. Will my base class
>initializer always get called regardless of whether or not I use super
>()? If so, does this occur prior to any code in my derived class
>initializer being executed (in other words, if I don't explicitly call
>"super()" in my derived class, am I guaranteed that the base class
>"__init__" has executed completely)? If so, then I guess I can forego
>the use of "super()"

Neither the use nor disuse of super can guarantee any of these things.
Old-style base method calling (ie, "Foo.bar(self, ...)" - as opposed to
using super) is just as capable of causing these things to happen as is
super *except* in the case of diamond inheritance.  If you use either
correctly, it will do what you want.  It's just that using super correctly
is a lot harder most of the time.

Jean-Paul


From contactatishay at gmail.com  Mon Feb  9 19:40:40 2009
From: contactatishay at gmail.com (Atishay)
Date: Mon, 9 Feb 2009 16:40:40 -0800 (PST)
Subject: how to find out vesion of a python module
Message-ID: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>

I have Python Image Library installed. I do not know how to find out
its version. How can I do that?

Secondly, I get error if I say "import ImageFont"

ImportError: The _imaging C module is not installed

I have _imaging module though

[bash]# file PIL/_imaging.so

PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
(SYSV), not stripped

How could I fix this?


From cptn.spoon at gmail.com  Mon Feb  9 19:46:33 2009
From: cptn.spoon at gmail.com (cptn.spoon)
Date: Mon, 9 Feb 2009 16:46:33 -0800 (PST)
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com>
	<1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com> 
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
	<mailman.9182.1234221985.3487.python-list@python.org>
Message-ID: <ac6f105b-42e1-4cee-bd13-8f07f7d3c221@w24g2000prd.googlegroups.com>

On Feb 10, 10:26?am, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-09 17:10, cptn.spoon wrote:
>
>
>
> > On Feb 9, 6:48 pm, "Hendrik van Rooyen"<m... at microcorp.co.za> ?wrote:
> >> "cptn.spoon"<cp...... at gmail.com> ?wrote:
>
> >> On Feb 9, 3:58 pm, Paul Rubin<http://phr... at NOSPAM.invalid> ?wrote:
>
> >>> Thanks Paul! I thought this might be the case. So how would I get the
> >>> StockMarket class instance to contain many Stock class instances and
> >>> then be able to iterate through them? I'm guessing the basic structure
> >>> would be as follows...but I think I'm wrong:
> >>> class StockMarket:
> >>> ? pass
> >> No.
> >> At this level, just use a list of instances of your Stock class.
>
> >> - Hendrik
>
> > How do I get a list of instances of a particular class? Is there a way
> > to do this dynamically?
>
> You *can*, but I highly recommend that you don't. Instead, just keep your own
> list of instances. When you make a new instance, just append it to the list (see
> below).
>
> ? ?all_stocks = []
>
> > Also, what would be the way of dynamically creating an instance of a
> > class based on user input (ie a user wants to create a new instance of
> > the Stock class via shell input)?
>
> Define an __init__ method on your class to initialize it from given values. Use
> raw_input() to query the user for information. Convert the text input to
> whatever objects your class needs (e.g. if the user entered "10" on the prompt,
> x=raw_input() will return the string '10', so you would do int(x) to get the
> integer 10). Now, instantiate your class with the arguments:
>
> ? ?the_stock = Stock(name, risk, initial_price)
>
> And append it to your list of stocks.
>
> ? ?all_stocks.append(the_stock)
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

That's exactly what I was after. Thanks Robert!


From greg.ewing at canterbury.ac.nz  Mon Feb  9 19:47:03 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 10 Feb 2009 13:47:03 +1300
Subject: ANN: SuPy 1.0 for Windows
Message-ID: <mailman.9194.1234229796.3487.python-announce-list@python.org>

SuPy 1.0 - Windows
------------------

I have created a Windows binary of SuPy.

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Currently only Python 2.3 is supported. (I'm working on a
Python 2.5 version, but there are problems.)

It has only been tested with Sketchup 7, although there's
a chance it might work with Sketchup 6 as well.

I'm not sure how stable this version will be. There is
some dodgy mixing of runtime library versions going on.
All I can say right now is that it runs the included
example without crashing on my test machine.

What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From pauljefferson at gmail.com  Mon Feb  9 19:51:59 2009
From: pauljefferson at gmail.com (PJ)
Date: Mon, 9 Feb 2009 16:51:59 -0800 (PST)
Subject: AJAX Post requests
Message-ID: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>

Hi,
I have a simple web server using  BaseHTTPServer, and the def do_POST
(self) function works fine for regular forms that are submitted to it,
but when I send an AJAX POST to it it does nothing (I've tried to just
get it to print to check it's nothing else but it doesn't even do
that, although it does for a regular POST request.
The post function is
    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            if ctype == 'multipart/form-data':
                query=cgi.parse_multipart(self.rfile, pdict)
            self.send_response(301)

            self.end_headers()
            print(query.get('data'))
            print('test')
            h = codecs.open ("log.txt", "a", encoding="utf8")
            h.write("test")
            h.close()


        except :

         pass

The AJAX post is appearing in the command prompt as any other post and
I can't see any reason why it shouldn't go to this function,
particularly if it works for a regular (non-AJAX) post, so any help
would be appreciated,
Paul


From gherron at islandtraining.com  Mon Feb  9 20:07:10 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 09 Feb 2009 17:07:10 -0800
Subject: how to find out vesion of a python module
In-Reply-To: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
Message-ID: <4990D33E.2060003@islandtraining.com>

Atishay wrote:
> I have Python Image Library installed. I do not know how to find out
> its version. How can I do that?
>   

There is no standard way.  However many module authors do include soch
information, usually in an attribute named version or __version__, or
VERSION.  PIL uses the VERSION

import Image
print Image.VERSION

> Secondly, I get error if I say "import ImageFont"
>
> ImportError: The _imaging C module is not installed
>
> I have _imaging module though
>
> [bash]# file PIL/_imaging.so
>
> PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
> (SYSV), not stripped
>
> How could I fix this?
>   

It looks like you have it installed incorrectly,   How did you install
it.  What platform/system are you on? 
PIL usually uses a PIL.pth file.  Does that exist?  Where? And what are
its contents?

Gary Herron


> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From fetchinson at googlemail.com  Mon Feb  9 20:19:41 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 9 Feb 2009 17:19:41 -0800
Subject: "Super()" confusion
In-Reply-To: <20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
Message-ID: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>

>>Hello. I've been scouring the web looking for something to clear up a
>>little confusion about the use of "super()" but haven't found anything
>>that really helps. Here's my simple example:
>>
>> [snip]
>>
>>"super(Child,self).__init__(filePath)
>>TypeError: super() argument 1 must be type, not classobj"
>>
>>What have I done wrong? Thanks in advance for any help.
>
> Consider whether you really need to use super().
>
> http://fuhm.net/super-harmful/

Did you actually read that article, understood it, went through the
tons of responses from python-dev team members, including Guido, or
simply read its title, did absolutely no serious thinking about it and
go on throwing it around as if it would prove anything?

I can't believe this "super( ) is harmful" BS is still alive, it grew
to be a mature internet meme like the dancing hamster or star wars kid
:)

See (among tons of other writings):

http://mail.python.org/pipermail/python-dev/2005-January/thread.html

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From jacob.kaplanmoss at gmail.com  Mon Feb  9 20:26:32 2009
From: jacob.kaplanmoss at gmail.com (Jacob Kaplan-Moss)
Date: Mon, 9 Feb 2009 17:26:32 -0800 (PST)
Subject: PyCon 2009: Call for sprint projects
Message-ID: <f91638b1-7634-4877-8842-80859ab589dc@v42g2000yqj.googlegroups.com>

Python-related projects: join the PyCon Development Sprints!

The development sprints are a key part of PyCon, a chance for the
contributors
to open-source projects to get together face-to-face for up to four
days of
intensive learning and development. Newbies sit at the same table as
the gurus,
go out for lunch and dinner together, and have a great time while
advancing
their project. Sprints are one of the best parts of PyCon; in 2008
over 250
sprinters came for at least one day!

If your project would like to sprint at PyCon, now is the time to let
us know.
We'll collect your info and publish it so that participants will have
time to
make plans. We'll need to get the word out early so that folks who
want to
sprint have time to make travel arrangements.

In the past, some have been reluctant to commit to sprinting: some may
not know
what sprinting is all about; others may think that they're not
"qualified" to
sprint. We're on an ongoing mission to change that perception:

* We'll help promote your sprint. The PyCon website, the PyCon blog,
the PyCon
  podcast, and press releases will be there for you.

* PyCon attendees will be asked to commit to sprints on the
registration form,
  which will include a list of sprints with links to further info.

* We will be featuring a "How To Sprint" session on Sunday afternoon,
followed
  by sprint-related tutorials, all for free. This is a great
opportunity to
  introduce your project to prospective contributors. We'll have more
details
  about this later.

* Some sponsors are helping out with the sprints as well.

There's also cost. Although the sprinting itself is free, sprints have
associated time and hotel costs. We can't do anything about the time
cost, but
we may have some complimentary rooms and funding available for
sprinters. We
will have more to say on financial aid later.

Those who want to lead a sprint should send the following information
to pycon-organizers at python.org:

* Project/sprint name

* Project URL

* The name and contact info (email and/or telephone) for the sprint
leader(s)
  and other contributors who will attend the sprint

* Instructions for accessing the project's code repository and
documentation (or
  a URL)

* Pointers to new contributor information (setup, etc.)

* Any special requirements (projector? whiteboard? flux capacitor?)

We will add this information to the PyCon website and set up a wiki
page for you
(or we can link to yours). Projects should provide a list of goals
(bugs to fix,
features to add, docs to write, etc.), especially some goals for
beginners, to
attract new sprinters. The more detail you put there, the more
prepared your
sprinters will be, and the more results you'll get.

In 2008 there were sprints for Python, TurboGears, Pylons, Django,
Jython, WSGI,
PyGame, Bazaar, Trac, PyCon-Tech, OLPC, Orbited, PyPy, Grok, and many
others. We
would like to see all these and more!

Sprints will start with an introductory session on Sunday, March 29;
this
session will begin immedately after PyCon's scheduled portion ends.
The sprints
themselves will run from Monday, March 30 through Thursday, April 2,
2009.

You can find all these details and more at http://us.pycon.org/2009/sprints/.

If you have any questions, feel free to contact me directly.
Thank you very much, and happy coding!

Jacob Kaplan-Moss
<jacob at jacobian.org>


From exarkun at divmod.com  Mon Feb  9 20:27:39 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 20:27:39 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
Message-ID: <20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>

On Mon, 9 Feb 2009 17:19:41 -0800, Daniel Fetchinson <fetchinson at googlemail.com> wrote:
>>>Hello. I've been scouring the web looking for something to clear up a
>>>little confusion about the use of "super()" but haven't found anything
>>>that really helps. Here's my simple example:
>>>
>>> [snip]
>>>
>>>"super(Child,self).__init__(filePath)
>>>TypeError: super() argument 1 must be type, not classobj"
>>>
>>>What have I done wrong? Thanks in advance for any help.
>>
>> Consider whether you really need to use super().
>>
>> http://fuhm.net/super-harmful/
>
>Did you actually read that article, understood it, went through the
>tons of responses from python-dev team members, including Guido

Yes.  Why the knee-jerk reaction?  I simply pointed out a resource which
might be helpful to someone trying to learn to use super.

Jean-Paul


From fetchinson at googlemail.com  Mon Feb  9 20:34:05 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 9 Feb 2009 17:34:05 -0800
Subject: "Super()" confusion
In-Reply-To: <20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
Message-ID: <fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>

>>>>Hello. I've been scouring the web looking for something to clear up a
>>>>little confusion about the use of "super()" but haven't found anything
>>>>that really helps. Here's my simple example:
>>>>
>>>> [snip]
>>>>
>>>>"super(Child,self).__init__(filePath)
>>>>TypeError: super() argument 1 must be type, not classobj"
>>>>
>>>>What have I done wrong? Thanks in advance for any help.
>>>
>>> Consider whether you really need to use super().
>>>
>>> http://fuhm.net/super-harmful/
>>
>>Did you actually read that article, understood it, went through the
>>tons of responses from python-dev team members, including Guido
>
> Yes.  Why the knee-jerk reaction?

Because throwing around that link carries about the same amount of
information as "perl is better than python", "my IDE is better than
yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

> I simply pointed out a resource which
> might be helpful to someone trying to learn to use super.

It will certainly not be helpful to anyone trying to learn the usage
of super. The person who wrote that essay is simply misunderstanding
the concept, as has been explained countless times by the python dev
team. Hence, it only increases confusion, adds to the noise and
spreads false alarm.

Honestly, I don't understand how this thing got so much out of
control. If anyone starts an intelligent question or remark about
super, this essay is thrown in no matter what. Anyone can explain why?

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From cs at zip.com.au  Mon Feb  9 20:38:06 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 10 Feb 2009 12:38:06 +1100
Subject: wsdl2py/ZSI and complex types with arrays
In-Reply-To: <4989ba74$0$24592$da0feed9@news.zen.co.uk>
Message-ID: <20090210013806.GA29349@cskk.homeip.net>

On 04Feb2009 15:55, eviljonny <how at about.no.com> wrote:
| I have been trying to write a web service using ZSI with wsdl2py. I have 
| read 'The Zolera Soap Infrastructure User?s Guide Release 2.0.0' and some 
| older guides (a guide by Nortel called Using ZSI with wsdl2py) and am 
| unable to find any working examples of how to use arrays in complex 
| types. I have a Request method which takes an array as an argument and 
| responds with an array.
[...]
| Can anyone provide me an example (or a link to an example) of how to 
| populate the arrays in complex types? Even pointing me in the right 
| direction would be wonderful.

I am by no means a ZSI expert. You may do better to join this list:
  https://lists.sourceforge.net/lists/listinfo/pywebsvcs-talk
and ask there.

Glancing at some code using ZSI-2.1-a1 here I've got code like this:

  # MR refers to a complex type with a <loginResultList> component,
  # and that contains a list of <item> elements
  LRL = MR._loginResultList = MR.new_loginResultList()
  LRL._item = []
  for LI in RQ.get_element_LoginList():
    class item:
      ... fill in some class attributes ...
    LRL._item.append(item)

thus populating the <loginResultList> with <item> elements.
("item" is only a class for the convenience of having _foo attributes easy to
assign to).

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743


From contactatishay at gmail.com  Mon Feb  9 20:50:25 2009
From: contactatishay at gmail.com (Atishay)
Date: Mon, 9 Feb 2009 17:50:25 -0800 (PST)
Subject: how to find out vesion of a python module
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
	<mailman.9188.1234228035.3487.python-list@python.org>
Message-ID: <90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>


>
> There is no standard way. ?However many module authors do include soch
> information, usually in an attribute named version or __version__, or
> VERSION. ?PIL uses the VERSION
>
> import Image
> print Image.VERSION

Thank you very much. This works

>
> > Secondly, I get error if I say "import ImageFont"
>
> > ImportError: The _imaging C module is not installed
>
> > I have _imaging module though
>
> > [bash]# file PIL/_imaging.so
>
> > PIL/_imaging.so: ELF 32-bit LSB shared object, Intel 80386, version 1
> > (SYSV), not stripped
>
> > How could I fix this?
>
> It looks like you have it installed incorrectly, ? How did you install
> it. ?What platform/system are you on?
> PIL usually uses a PIL.pth file. ?Does that exist? ?Where? And what are
> its contents?

I think it is installed correctly. Here is why.

If I do export LD_LIBRARY_PATH="/usr/local/lib:$LD_LIBRARY_PATH"
now if I run python and say "import ImageFont", it works correctly.

contents of PIL.pth
[bash]#cat PIL.pth
PIL

[atishay at borel site-packages]$ ls PIL.pth
PIL.pth
[atishay at borel site-packages]$ ls -d PIL
PIL

Now the point is, how do I avoid setting LD_LIBRARY_PATH everytime for
python? I know I can write a bash script, but I am sure python would
have some feature that I can tweak to make it work.

Regards

Atishay

>
> Gary Herron
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>



From exarkun at divmod.com  Mon Feb  9 20:59:36 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 9 Feb 2009 20:59:36 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
Message-ID: <20090210015936.12853.1154494242.divmod.quotient.8101@henry.divmod.com>

On Mon, 9 Feb 2009 17:34:05 -0800, Daniel Fetchinson <fetchinson at googlemail.com> wrote:
>>>>>Hello. I've been scouring the web looking for something to clear up a
>>>>>little confusion about the use of "super()" but haven't found anything
>>>>>that really helps. Here's my simple example:
>>>>>
>>>>> [snip]
>>>>>
>>>>>"super(Child,self).__init__(filePath)
>>>>>TypeError: super() argument 1 must be type, not classobj"
>>>>>
>>>>>What have I done wrong? Thanks in advance for any help.
>>>>
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>>Did you actually read that article, understood it, went through the
>>>tons of responses from python-dev team members, including Guido
>>
>> Yes.  Why the knee-jerk reaction?
>
>Because throwing around that link carries about the same amount of
>information as "perl is better than python", "my IDE is better than
>yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

That's not true.  The page contains lots of information.

>> I simply pointed out a resource which
>> might be helpful to someone trying to learn to use super.
>
>It will certainly not be helpful to anyone trying to learn the usage
>of super. The person who wrote that essay is simply misunderstanding
>the concept, as has been explained countless times by the python dev
>team. Hence, it only increases confusion, adds to the noise and
>spreads false alarm.

Quoting Guido, in whom you seem to place a lot of faith:

  Super is intended for use that are designed with method cooperation in
  mind, so I agree with the best practices in James's Conclusion:

  """
    * Use it consistently, and document that you use it,
      as it is part of the external interface for your class, like it or not.
    * Never call super with anything but the exact arguments you received,
      unless you really know what you're doing.
    * When you use it on methods whose acceptable arguments can be
      altered on a subclass via addition of more optional arguments,
      always accept *args, **kw, and call super like
      "super(MyClass, self).currentmethod(alltheargsideclared, *args,
**kwargs)".
      If you don't do this, forbid addition of optional arguments in subclasses.
    * Never use positional arguments in __init__ or __new__.
      Always use keyword args, and always call them as keywords,
      and always pass all keywords on to super.
  """

The original poster's code did not use it consistently, did not document its use, and used positional arguments in __init__.  So according to Guido, the
OP was misusing super.  Why are you complaining that I pointed this out?

>Honestly, I don't understand how this thing got so much out of
>control. If anyone starts an intelligent question or remark about
>super, this essay is thrown in no matter what. Anyone can explain why?

You're seriously overreacting.

Jean-Paul


From benjamin at python.org  Mon Feb  9 21:02:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 10 Feb 2009 02:02:43 +0000 (UTC)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
Message-ID: <loom.20090210T020048-489@post.gmane.org>

Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> Consider whether you really need to use super().
> 
> http://fuhm.net/super-harmful/

This article chiefly deals with super()'s harm in multiple inteheritance
situations. For the simple case, though, like that presented by the OP, I
believe super() is perfect.






From samslists at gmail.com  Mon Feb  9 21:19:10 2009
From: samslists at gmail.com (Sam)
Date: Mon, 9 Feb 2009 18:19:10 -0800 (PST)
Subject: codecs.open and buffering modes...
Message-ID: <56a55b5c-ca64-4c84-a8a8-3912af384e4c@f40g2000pri.googlegroups.com>

codecs.open defaults to line buffering.  But open defaults to using
the system buffer size.  Why the discrepancy?  Is it different for a
reason?

How do these choices affect performance?  (Particularly under Linux).

Thanks


From danielzhou86 at gmail.com  Mon Feb  9 21:54:46 2009
From: danielzhou86 at gmail.com (Daniel Zhou)
Date: Tue, 10 Feb 2009 10:54:46 +0800
Subject: python-list
Message-ID: <8bd9daa20902091854y318a09axe118ebda838b17da@mail.gmail.com>

python-list
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090210/f901fd8e/attachment-0001.html>

From joe at socallinuxexpo.org  Mon Feb  9 21:55:54 2009
From: joe at socallinuxexpo.org (joe at socallinuxexpo.org)
Date: Mon, 9 Feb 2009 18:55:54 -0800 (PST)
Subject: Python at the SoCal Linux Expo
Message-ID: <48917.75.19.166.49.1234234554.squirrel@socallinuxexpo.org>

Hey guys,

The Southern California Linux Expo, a community run conference taking
place in Los Angeles on February 20th to 22nd, is offering a 50% discount
to the Python community. When you go to register[1], just enter the promo
code: PYTHN. If you have any questions, please let me know.

Thanks!
Joe Smith
Southern California Linux Expo

[1] https://socallinuxexpo.org/reg7/





From spacebar265 at gmail.com  Mon Feb  9 22:10:28 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Mon, 9 Feb 2009 19:10:28 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
Message-ID: <203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>

On Feb 9, 5:13?pm, Steve Holden <st... at holdenweb.com> wrote:
> Spacebar265 wrote:
> > On Feb 7, 2:17 am, Jorgen Grahn <grahn+n... at snipabacken.se> wrote:
> >> On Wed, 4 Feb 2009 22:48:13 -0800 (PST), Spacebar265 <spacebar... at gmail.com> wrote:
> >>> Hi. Does anyone know how to scan a filecharacterbycharacterand
> >>> have eachcharacterso I can put it into a variable. I am attempting
> >>> to make a chatbot and need this to read the saved input to look for
> >>> spelling mistakes and further analysis of user input.
> >> That does not follow. To analyze a text, the worst possible starting
> >> point is one variable for eachcharacter(what would you call them --
> >> character_1, character_2, ... character_65802 ?)
>
> I believe most people would read the input a line at a time and split
> the lines into words. It does depend whether you are attempting
> real-time spelling correction, though. That would be a different case.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Thanks. How would I do separate lines into words without scanning one
character at a time?


From kp8 at mac.com  Mon Feb  9 22:26:56 2009
From: kp8 at mac.com (kpp9c)
Date: Mon, 9 Feb 2009 19:26:56 -0800 (PST)
Subject: Python Launcher.app on OS X
Message-ID: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>

I am very confused about the current state of Python on OS X 10.5.
Looks like Apple ships with 2.5.1 and that is also the latest
installer for OS 10.5. The notes on the wiki page found here:

http://wiki.python.org/moin/MacPython/Leopard

Say:

Mac OS X 10.5.x (Leopard) comes with the 2.5.1 Python distribution pre-
installed, with an integrated Python Launcher.app

[...]

It is recommended that you delete the newly installed Python
Launcher.app, because it is already present inside the system
Python.framework. If you have installed Apple's developer tools (Xcode
et al), it is recommended that you delete the newly installed Build
Applet.app, because it is already present in /Developer/Applications/
Utilities/MacPython 2.5.

okay... for the life of me i do not see any Python Launcher.app and i
just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
installed the dev kit.

Where the heck is this application?

best,

kp




From gagsl-py2 at yahoo.com.ar  Mon Feb  9 22:29:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 01:29:42 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
Message-ID: <op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>

En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson  
<fetchinson at googlemail.com> escribi?:

>>>>> Hello. I've been scouring the web looking for something to clear up a
>>>>> little confusion about the use of "super()" but haven't found  
>>>>> anything
>>>>> that really helps. Here's my simple example:
>>>>>
>>>>> [snip]
>>>>>
>>>>> "super(Child,self).__init__(filePath)
>>>>> TypeError: super() argument 1 must be type, not classobj"
>>>>>
>>>>> What have I done wrong? Thanks in advance for any help.
>>>>
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>> Did you actually read that article, understood it, went through the
>>> tons of responses from python-dev team members, including Guido
>>
>> Yes.  Why the knee-jerk reaction?
>
> Because throwing around that link carries about the same amount of
> information as "perl is better than python", "my IDE is better than
> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

Not at all. It contains accurate and valuable information that isn't  
available elsewhere.

>> I simply pointed out a resource which
>> might be helpful to someone trying to learn to use super.
>
> It will certainly not be helpful to anyone trying to learn the usage
> of super. The person who wrote that essay is simply misunderstanding
> the concept, as has been explained countless times by the python dev
> team. Hence, it only increases confusion, adds to the noise and
> spreads false alarm.

AFAIK, all facts appearing in said article are still true (except for 3.x  
which uses a shorter form). If super usage had been clearly documented in  
the first place, this had not happened.
Perhaps you could point us to some resource explaining how is super  
supposed to be used correctly?
And of those giving explanations in python-dev, nobody cared to add a  
single word to the Python documentation for years.

> Honestly, I don't understand how this thing got so much out of
> control. If anyone starts an intelligent question or remark about
> super, this essay is thrown in no matter what. Anyone can explain why?

Because for a very loooooong time (seven years, 2001-2008) super was  
almost undocumented. The Library Reference -before release 2.6- only had a  
short paragraph, the online documentation referred (and still does) to the  
original essay by Guido introducing descriptors, which is inaccurate and  
outdated, and then the "... harmful" article was the only source of  
information available.
Worse was the fate of packages and how they're imported: nobody "could be  
bothered to spell that out" (sic); or how import works in general, still  
barely documented (one has to dig into the PEP collection, trying to guess  
what parts are truly implemented and what parts are only a wish...)

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 22:46:52 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 03:46:52 GMT
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<mailman.9191.1234229649.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>

On Mon, 09 Feb 2009 17:34:05 -0800, Daniel Fetchinson wrote:

...
>>>> Consider whether you really need to use super().
>>>>
>>>> http://fuhm.net/super-harmful/
>>>
>>>Did you actually read that article, understood it, went through the
>>>tons of responses from python-dev team members, including Guido

"Tons" of responses?

I count 16, about a third of which are written by James Knight himself 
(the author of the page you are ranting against), and of the remaining, 
about half are low-to-zero information content, e.g. Tim Peter's joke 
about renaming the page for better marketing value.

It's especially telling that even Guido, the most vocal critic of the 
article, is critical of the *title* but not the content. In his first 
post, he says: "I agree with the best practices in James's 
Conclusion...", and suggested that if the article was called "Multiple 
Inheritance Pitfalls in Python" he'd be much happier.


>> Yes.  Why the knee-jerk reaction?
> 
> Because throwing around that link carries about the same amount of
> information as "perl is better than python", "my IDE is better than
> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.

This is clearly not the case when even the most vocal critic agrees with 
the article's recommendations.


>> I simply pointed out a resource which might be helpful to someone
>> trying to learn to use super.
> 
> It will certainly not be helpful to anyone trying to learn the usage of
> super. 

I've read it, and found it very useful.


> The person who wrote that essay is simply misunderstanding the
> concept, as has been explained countless times by the python dev team.

"Countless". Is that more or less than the "tons of responses" above?


> Hence, it only increases confusion, adds to the noise and spreads false
> alarm.

So you say.


> Honestly, I don't understand how this thing got so much out of control.
> If anyone starts an intelligent question or remark about super, this
> essay is thrown in no matter what. Anyone can explain why?

Because inheritance is potentially confusing. Multiple inheritance is 
even more confusing. Multiple inheritance with diamond diagrams even more 
so, and multiple inheritance with diamond diagrams and non-cooperative 
classes are simply impossible to get right.

Because there are many pitfalls to inheritance in Python, and they aren't 
obvious: who on earth would imagine that calling __init__ or __new__ with 
positional arguments could be dangerous? James Knight's article is a well-
written, understandable description of some of them, in one place and 
with a catchy title. Of course people are going to link to it.

And finally, because people do wrongly get the impression that using 
super will magically make those problems go away. I know this, because I 
was one of them.

(I went through the anger period, sure that Knight must be full of it. 
How could anyone suggest that Guido made a super that isn't perfect? I 
got past that once I realised just how complex inheritance actually is. 
Currently I'm in denial, writing code with super and hoping that it will 
Just Work but not pushing it too hard in case it doesn't.)



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb  9 22:49:03 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 03:49:03 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
Message-ID: <pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>

On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:

> How would I do separate lines into words without scanning one character
> at a time?

Scan a line at a time, then split each line into words.


for line in open('myfile.txt'):
    words = line.split()


should work for a particularly simple-minded idea of words.



-- 
Steven


From rt8396 at gmail.com  Tue Feb 10 00:05:28 2009
From: rt8396 at gmail.com (r)
Date: Mon, 9 Feb 2009 21:05:28 -0800 (PST)
Subject: Best 3d graphics kit for CAD program???
References: <a7c8e415-15ae-4e84-a41e-5f9da4ca7a0f@v38g2000yqb.googlegroups.com>
	<498F1D54.9010509@islandtraining.com>
	<mailman.9173.1234208036.3487.python-list@python.org> 
	<fd8da2da-97f6-4c6b-92d0-cfe358d628e4@v13g2000yqm.googlegroups.com> 
	<63721531-a4de-4103-92a8-b87933df3b22@o2g2000prl.googlegroups.com>
Message-ID: <0a805ebf-0b8e-44ea-9e87-579960466623@x9g2000yqk.googlegroups.com>

OpenCascade looks promising. I had look at this before a while back
and forgot about it. For now i am taking the OpenGL plunge and I will
see where that takes me...?

Thanks Duane


From research at johnohagan.com  Tue Feb 10 00:14:19 2009
From: research at johnohagan.com (John O'Hagan)
Date: Tue, 10 Feb 2009 05:14:19 +0000
Subject: Small socket problem
In-Reply-To: <op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>
References: <200902090943.36445.research@johnohagan.com>
	<op.uo28bck8x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <200902100514.19632.research@johnohagan.com>

On Mon, 9 Feb 2009, Gabriel Genellina wrote:
> En Mon, 09 Feb 2009 07:43:36 -0200, John O'Hagan <research at johnohagan.com>
>
> escribi?:
> > I'm using the socket module (python 2.5) like this (where 'options'
> > refers to
> > an optparse object) to connect to the Fluidsynth program:
> >
> >             host = "localhost"
> >             port = 9800
> >             fluid = socket(AF_INET, SOCK_STREAM)
> >             try:
> >                 fluid.connect((host, port))  #Connect if fluidsynth is
> > running
> >             except BaseException:
> >                 print "Connecting to fluidsynth..." #Or start fluidsynth
> >                 soundfont =  options.soundfont
> >                 driver = options.driver
> >                 Popen(["fluidsynth", "-i", "-s", "-g", "0.5",
> >                 "-C", "1",  "-R", "1", "-l", "-a", driver, "-j",
> > soundfont])
> >                 timeout = 50
> >                 while 1:
> >                     timeout -= 1
> >                     if timeout == 0:
> >                         print "Problem with fluidsynth: switching to
> > synth."
> >                         play_method = "synth"
> >                         break
> >                     try:
> >                         fluid.connect((host, port))
> >                     except BaseException:
> >                         sleep(0.05)
> >                         continue
> >                     else:
> >                         break
> >
> > (I'm using BaseException because I haven't been able to discover what
> > exception class[es] socket uses).
>
> Usually socket.error, which is a subclass of IOError, but others might
> happen too I think. In any case, the most generic except clause you should
> use is
> try:
> except Exception: ...
> (because you usually don't want to catch KeyboardInterrupt nor SystemExit,
> that is, let Ctrl-C and sys.exit() do their work)

Thanks, I had been doing "from socket import foo, bar" without 
importing "error", that now works. I think I should use that specific 
exception in the try clause for now so I can see any other exceptions that 
may occur, a good idea?

>
> > The problem is that this fails to connect ( the error is "111: Connection
> > refused") the first time I run it after booting if fluidsynth is not
> > already
> > running, no matter how long the timeout is; after Ctrl-C'ing out of the
> > program, all subsequent attempts succeed. Note that fluidsynth need not
> > be
> > running for a success to occur.
>
> Always the same exception? In both lines?

Yes; I'm sure this is obvious, but just for clarity: if fluidsynth is not 
running I expect that error at the first line where connection is attempted, 
and at the second line during the loop while fluidsynth is loading (this 
takes 0.5-5 seconds depending on the size of the soundfont it's using). But I 
don't understand why the connection is still refused once fluidsynth has 
finished loading.

I received an off-list reply to this post to the effect that attempting to 
reuse a socket on which a connection attempt has failed, will fail, and that 
I needed to create a new socket for each attempt. It seemed very plausible, 
so I tried inserting a fresh

fluid = socket(AF_INET, SOCK_STREAM)

before the second fluid.connect() in the loop; but this still behaved the same 
way. Is that the way to do it?

Annoyingly, I've so far only been able reproduce the problem by rebooting.

Regards,

John


From r.warhekar at gmail.com  Tue Feb 10 00:24:13 2009
From: r.warhekar at gmail.com (Rahul)
Date: Mon, 9 Feb 2009 21:24:13 -0800 (PST)
Subject: adodb has no attribute connect
References: <2fb8b6ce-f18c-457e-8adc-492f6e83f8a8@q30g2000prq.googlegroups.com>
	<6vbufnFj957sU1@mid.uni-berlin.de>
Message-ID: <acea82a2-8484-49fb-a9df-f0db1387cfc6@40g2000prx.googlegroups.com>

On Feb 10, 5:01?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Rahul schrieb:
>
> > Hello all,
>
> > I have to access data from database usingadodbso I did
>
> > Importadodb
> > Conn=adodb.NewADOConnection("odbc")
>
> > Upto this it works properly but when I say
>
> It does not. It returns None, thus the following error you see.
>
> > Conn.Connect("","","")
>
> > It gives error as
>
> > [Attributrerror]: Object Nonetype has no attribute Connect.
>
> > I have Red Hat Enterprise Linux 4
> > Python 2.5
> > Mod_python 3.3.1
>
> According to the docs on the (very old and seemingly not actively
> developedadodb-site), "odbc" needs the Python windows extensions. As
> you are on redheat, I have difficulties believing you make these work.
>
> Maybe mxodbc works? Or even better, ditch that ado-stuff and connect
> directly to your database. Python's DB-API is better I guess, no need
> for this attempt at mimicking windows APIs.
>
> Diez

Thank you Diez

I think this is very useful for me to change my mind and get shifted
to DB-API.

I will try to work on it.

Rahul


From michele.simionato at gmail.com  Tue Feb 10 00:26:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 9 Feb 2009 21:26:20 -0800 (PST)
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com> 
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com> 
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com> 
	<mailman.9200.1234236604.3487.python-list@python.org>
Message-ID: <2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>

On Feb 10, 4:29?am, "Gabriel Genellina"
> AFAIK, all facts appearing in said article are still true (except for 3.x ?
> which uses a shorter form). If super usage had been clearly documented in ?
> the first place, this had not happened.
> Perhaps you could point us to some resource explaining how is super ?
> supposed to be used correctly?
> And of those giving explanations in python-dev, nobody cared to add a ?
> single word to the Python documentation for years.
>
> > Honestly, I don't understand how this thing got so much out of
> > control. If anyone starts an intelligent question or remark about
> > super, this essay is thrown in no matter what. Anyone can explain why?
>
> Because for a very loooooong time (seven years, 2001-2008) super was ?
> almost undocumented. The Library Reference -before release 2.6- only had a ?
> short paragraph, the online documentation referred (and still does) to the ?
> original essay by Guido introducing descriptors, which is inaccurate and ?
> outdated, and then the "... harmful" article was the only source of ?
> information available.

All right. This is way I made the effort of writing a comprehensive
collection of all the tricky points about super
I knew:

http://www.artima.com/weblogs/viewpost.jsp?thread=236275
http://www.artima.com/weblogs/viewpost.jsp?thread=236278
http://www.artima.com/weblogs/viewpost.jsp?thread=237121

Also see this thread on python-dev about the issue of super
documentation: http://www.gossamer-threads.com/lists/python/dev/673833


                 Michele Simionato


From research at johnohagan.com  Tue Feb 10 00:28:26 2009
From: research at johnohagan.com (John O'Hagan)
Date: Tue, 10 Feb 2009 05:28:26 +0000
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <200902100528.27070.research@johnohagan.com>

On Mon, 9 Feb 2009, Aaron Brady wrote:
> Hello,
>
> I am writing a generator to return a sequence of numbers with some
> variation.  The parameters of the variation can be changed by the
> caller, even after the generator is started. 
[...]

I would love to see a simple code example of this if you have one; I've been 
wanting to do this but couldn't even get started.

Regards,

John


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 01:04:16 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 06:04:16 GMT
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:

> On Mon, 9 Feb 2009, Aaron Brady wrote:
>> Hello,
>>
>> I am writing a generator to return a sequence of numbers with some
>> variation.  The parameters of the variation can be changed by the
>> caller, even after the generator is started.
> [...]
> 
> I would love to see a simple code example of this if you have one; I've
> been wanting to do this but couldn't even get started.


Is this too simple?


>>> def gen(n):
...     while True:
...             obj = yield n
...             if obj is not None: n = obj
...
>>> g = gen(5)
>>> g.next()
5
>>> g.next()
5
>>> g.send(12)
12
>>> g.next()
12




-- 
Steven


From xie.kenneth at gmail.com  Tue Feb 10 01:11:31 2009
From: xie.kenneth at gmail.com (Ken)
Date: Tue, 10 Feb 2009 14:11:31 +0800
Subject: select error 10093 on winxp
Message-ID: <8af39e160902092211r7aa5a156s5a22d12cf0179e8e@mail.gmail.com>

I was testing select on windows xp with python 2.6.1, the code is simple:

import sys
import select

def testSelect():
    r = select.select([sys.stdin], [], [], 5.0)
    print r

if __name__ == "__main__":
    try:
        testSelect()
    except select.error, e:
        print e

While an error raised like this:

(10093, '\xd3\xa6\xd3\xc3\xb3\xcc\xd0\xf2\xc3\xbb\xd3\xd0\xb5\xf7\xd3\xc3
WSAStartup\xa3\xac\xbb\xf2\xd5\xdf WSAStartup')

What is this about?

Thanks in adv.
-------------- next part --------------
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From lepto.python at gmail.com  Tue Feb 10 01:28:15 2009
From: lepto.python at gmail.com (oyster)
Date: Tue, 10 Feb 2009 14:28:15 +0800
Subject: can multi-core improve single funciton?
Message-ID: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>

I mean this
[code]
def fib(n):
    if n<=1:
        return 1
    return fib(n-1)+fib(n-2)

useCore(1)
timeit(fib(500)) #this show 20 seconds

useCore(2)
timeit(fib(500)) #this show 10 seconds
[/code]

Is it possible?

and more, can threads/multi-processors/clusters be used to improve fib?

thanx


From clp2 at rebertia.com  Tue Feb 10 01:43:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 22:43:50 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
Message-ID: <50697b2c0902092243r36b5f0d9lcb41fea1b94fe42b@mail.gmail.com>

On Mon, Feb 9, 2009 at 10:28 PM, oyster <lepto.python at gmail.com> wrote:
> I mean this
> [code]
> def fib(n):
>    if n<=1:
>        return 1
>    return fib(n-1)+fib(n-2)
>
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
>
> useCore(2)
> timeit(fib(500)) #this show 10 seconds
> [/code]
>
> Is it possible?
>
> and more, can threads/multi-processors/clusters be used to improve fib?

Considering the GIL, I highly doubt it so. Also, the algorithm is
fundamentally linear -- each result depends on previous results -- so
I don't think you can easily parallelize it (if at all). You'd
probably get greater speedup using memoization.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From greg at cosc.canterbury.ac.nz  Tue Feb 10 01:58:08 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Tue, 10 Feb 2009 19:58:08 +1300
Subject: 'Import sys' succeeds in C++ embedded code, but module is not
	fully visible
In-Reply-To: <965ac14d-3a1d-4a00-bc94-6d09f2490d67@v42g2000yqv.googlegroups.com>
References: <b11e6e8a-98a6-43d1-b311-652fedbe7498@h5g2000yqh.googlegroups.com>
	<fc076702-4df0-484b-8cfc-65afb860d541@h5g2000yqh.googlegroups.com>
	<f917408b-c5c6-4e56-aca2-ff4d0076b09e@a26g2000prf.googlegroups.com>
	<8ddcc387-cc11-4401-8c07-f0ee26983a58@a29g2000pra.googlegroups.com>
	<965ac14d-3a1d-4a00-bc94-6d09f2490d67@v42g2000yqv.googlegroups.com>
Message-ID: <49912580.1000002@cosc.canterbury.ac.nz>

Ben Sizer wrote:
> Yes, this seems to fix it, thanks. But why? Can some Python guru
> explain why these two dictionaries must be the same? (Or what steps we
> must take if we want them to be separate?)

What's happening is that the import statement is binding
the name 'sys' in the locals, not the globals. You don't
notice this in the top-level code, since both are in scope
there. But inside the function you can only see the top-level
globals plus the function's own locals.

> I had hoped to be able to clear out the locals dictionary
> while leaving useful functions intact in the globals dictionary, but
> it would appear that is not practical.

You can probably do that by using global statements in the
top-level code for the things you want to preserve, e.g.

    global sys
    import sys
    my_local_var = 42

    global f
    def f():
      print "This function is in globals and can see sys.path"
      print sys.path

    def g():
      print "This function is in locals and can't see sys.path"

Now clearing the locals will remove g and my_local_var
while leaving the rest in globals.

The only restriction is that anything you want to refer
to from a function will have to be in the globals. This
includes other functions -- i.e. f() won't be able to
call g() in the example above.

-- 
Greg


From mail at microcorp.co.za  Tue Feb 10 01:59:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 08:59:54 +0200
Subject: wxPython vs Glade?
References: <20090209132321.GA30754@greedo> <gmpbd0$g68$2@ger.gmane.org>
Message-ID: <002601c98b4d$2e0e46c0$0d00a8c0@hendrik>

"Steve Holden" <steve at holdenweb.com> wrote:

> There's something called PythonCard built on top of wxPython that's
> fairly newb-friendly, though it gets clunkier as your demands grow.
> 
> You might also want to look at Dabo, which is a much more comprehensive
> framework that also hides much of wxPython's complexity.
> 

There is also Boa Constructor, that is a RAD tool that I have been
quite impressed by, after having been forced to use it in anger.
It handles all the GUI stuff for you, and what is there, seems solid
and bug free.

- Hendrik




From gagsl-py2 at yahoo.com.ar  Tue Feb 10 02:00:49 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 05:00:49 -0200
Subject: select error 10093 on winxp
References: <8af39e160902092211r7aa5a156s5a22d12cf0179e8e@mail.gmail.com>
Message-ID: <op.uo4i3nlex6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 04:11:31 -0200, Ken <xie.kenneth at gmail.com> escribi?:

> I was testing select on windows xp with python 2.6.1, the code is simple:

See the note in the documentation of module select:
http://docs.python.org/library/select.html#select.select

"Note: File objects on Windows are not acceptable, but sockets are. On  
Windows, the underlying select function is provided by the WinSock  
library, and does not handle file descriptors that don't originate from  
WinSock."

-- 
Gabriel Genellina



From could.net at gmail.com  Tue Feb 10 02:13:24 2009
From: could.net at gmail.com (Frank Potter)
Date: Mon, 9 Feb 2009 23:13:24 -0800 (PST)
Subject: What's wrong with my python? I can't use string
Message-ID: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>

I have a xxx.py which has code as below:

import string

print dir(string)
print string.printable


when I run it, I got the strange error:

"<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
"<root>\n"
"<result>##result##</result>\n"
"<msg>##msg##</msg>\n"
"<pass_no>##pass_no##</pass_no>\n"
"<pot_num>##pot_num##</pot_num>\n"
"<pots_mashed>##pots_mashed##</pots_mashed>\n"
"<yb_used>##yb_used##</yb_used>\n"
"<right>##right##</right>\n"
"</root>\n"
['__builtins__', '__doc__', '__file__', '__name__', 'str']
Traceback (most recent call last):
  File "del2.py", line 4, in ?
    print string.printable
AttributeError: 'module' object has no attribute 'printable'

It seems that I did not import the right string module I want. Can
someone give me a clue, please?



From clp2 at rebertia.com  Tue Feb 10 02:20:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 9 Feb 2009 23:20:35 -0800
Subject: What's wrong with my python? I can't use string
In-Reply-To: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
References: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902092320r3cc5beb8lfda96d030bef9ad1@mail.gmail.com>

On Mon, Feb 9, 2009 at 11:13 PM, Frank Potter <could.net at gmail.com> wrote:
> I have a xxx.py which has code as below:
>
> import string
>
> print dir(string)
> print string.printable
>
>
> when I run it, I got the strange error:
>
> "<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
> "<root>\n"
> "<result>##result##</result>\n"
> "<msg>##msg##</msg>\n"
> "<pass_no>##pass_no##</pass_no>\n"
> "<pot_num>##pot_num##</pot_num>\n"
> "<pots_mashed>##pots_mashed##</pots_mashed>\n"
> "<yb_used>##yb_used##</yb_used>\n"
> "<right>##right##</right>\n"
> "</root>\n"
> ['__builtins__', '__doc__', '__file__', '__name__', 'str']
> Traceback (most recent call last):
>  File "del2.py", line 4, in ?
>    print string.printable
> AttributeError: 'module' object has no attribute 'printable'
>
> It seems that I did not import the right string module I want. Can
> someone give me a clue, please?

Sounds like the wrong `string` module is being imported. What's the
output of `print string.__file__`?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Tue Feb 10 02:22:20 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 09:22:20 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <015101c98b57$8bbe7420$0d00a8c0@hendrik>

"rantingrick" <ra..k.. at gmail.com> wrote

8< ----------------- dreams, goals and tentative spec -----------------

Have you looked at Pycad ? - it started off with a similar rush
some time ago.

Maybe there is something there that you can use and/or salvage.

- Hendrik




From could.net at gmail.com  Tue Feb 10 02:26:52 2009
From: could.net at gmail.com (Frank Potter)
Date: Mon, 9 Feb 2009 23:26:52 -0800 (PST)
Subject: What's wrong with my python? I can't use string
References: <9f2ccdc9-fdf8-4964-b13c-8db673c4f342@y1g2000pra.googlegroups.com>
	<mailman.9208.1234250440.3487.python-list@python.org>
Message-ID: <e286ae82-7765-4083-a0ff-6332223bb6a5@t39g2000prh.googlegroups.com>

On Feb 10, 3:20?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 9, 2009 at 11:13 PM, Frank Potter <could.... at gmail.com> wrote:
> > I have a xxx.py which has code as below:
>
> > import string
>
> > print dir(string)
> > print string.printable
>
> > when I run it, I got the strange error:
>
> > "<?xml version=\"1.0\" encoding=\"gbk\"?>\n"
> > "<root>\n"
> > "<result>##result##</result>\n"
> > "<msg>##msg##</msg>\n"
> > "<pass_no>##pass_no##</pass_no>\n"
> > "<pot_num>##pot_num##</pot_num>\n"
> > "<pots_mashed>##pots_mashed##</pots_mashed>\n"
> > "<yb_used>##yb_used##</yb_used>\n"
> > "<right>##right##</right>\n"
> > "</root>\n"
> > ['__builtins__', '__doc__', '__file__', '__name__', 'str']
> > Traceback (most recent call last):
> > ?File "del2.py", line 4, in ?
> > ? ?print string.printable
> > AttributeError: 'module' object has no attribute 'printable'
>
> > It seems that I did not import the right string module I want. Can
> > someone give me a clue, please?
>
> Sounds like the wrong `string` module is being imported. What's the
> output of `print string.__file__`?
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

Thank you so much ~
I got it.
I have a string.py in the same directory:(
and when I output string.__file__ as you told me, I know it.



From timr at probo.com  Tue Feb 10 02:34:02 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 10 Feb 2009 07:34:02 GMT
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
Message-ID: <38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>

Carl Banks <pavlovevidence at gmail.com> wrote:
>
>I'm pretty sure 2.6.1 is compiled with 8.0.  However, I think the
>Visual C++ 8.0 uses msvcrt90.dll.

No, the two digits of the DLL match the version number of C++.  The
confusion arises because the product is called "Visual Studio 2008", but it
includes Visual C++ 9.0, and hence msvcrt90.dll.  People say "VC8" when
they really mean Visual Studio 2008.

  Visual Studio 98    -  VC++ 6.0
  Visual Studio 2002  -  VC++ 7.0
  Visual Studio 2003  -  VC++ 7.1
  Visual Studio 2005  -  VC++ 8.0
  Visual Studio 2008  -  VC++ 9.0
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 02:34:54 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 07:34:54 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:

> I mean this
> [code]
> def fib(n):
>     if n<=1:
>         return 1
>     return fib(n-1)+fib(n-2)
> 
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
> 
> useCore(2)
> timeit(fib(500)) #this show 10 seconds [/code]
> 
> Is it possible?

What does useCore(n) mean?


> and more, can threads/multi-processors/clusters be used to improve fib?

No. The best way to improve fib is to improve fib, not to try running it 
on faster hardware.

Your algorithm makes *many* recursive calls to fib() for each call:

fib(1) => 1 function call
fib(2) => 3 function calls
fib(3) => 5 function calls
fib(4) => 9 function calls
fib(5) => 15 function calls
fib(6) => 25 function calls
fib(7) => 41 function calls
fib(8) => 67 function calls
fib(9) => 109 function calls
...
fib(34) => 18454929 function calls
fib(35) => 29860703 function calls
fib(36) => 48315633 function calls
...
fib(498) => 1.723e+104 function calls
fib(499) => 2.788e+104 function calls
fib(500) => 4.511e+104 function calls

Calling fib(500) the way you do will make more than 450 thousand billion 
billion billion billion billion billion billion billion billion billion 
billion function calls. You claim that you calculated it in just 20 
seconds. On my PC, it takes over a minute to calculate fib(38). I 
estimate it would take over five hours to calculate fib(50), and fib(100) 
would probably take 16 million years. I call shenanigans.



-- 
Steven


From nick.feinberg at gmail.com  Tue Feb 10 02:36:36 2009
From: nick.feinberg at gmail.com (Nicholas Feinberg)
Date: Mon, 9 Feb 2009 23:36:36 -0800
Subject: Problem with Tkinter's scale function.
Message-ID: <97c1d5380902092336x2289dfcyebf38ba933a53b81@mail.gmail.com>

Not the widget, the function in Canvas. So far as I can tell, integer values
for scale work fine; you can scale something to a factor of 2, 3, 17, etc.
Float values for scale - such as you might use if you were, say, trying to
scale a rectangle to half its current size - also work, insofar as the
targets of the scale-function are resized. The problem is that, in addition
to this resizing, they're sent hurtling off the canvas with remarkable
speed; rightwards if there's a float for the x-scale, downwards if there's a
float for the y-scale, bottom-rightwards if both are floats. It's
entertaining, but rather unhelpful.

Code that caused the problem (unlikely to be helpful, but no reason not to
include it):
self.canvas.scale(self.body,self.radius/(self.radius-.5),self.radius/(self.radius-.05),0,0)#radius
is greater than .5

Running Python 2.6 on Vista.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090209/edb13bef/attachment-0001.html>

From timr at probo.com  Tue Feb 10 02:37:12 2009
From: timr at probo.com (Tim Roberts)
Date: Tue, 10 Feb 2009 07:37:12 GMT
Subject: AJAX Post requests
References: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>
Message-ID: <7ib2p4lrhmlhr4gr0ifmvgdi24sp2dm309@4ax.com>

PJ <pauljefferson at gmail.com> wrote:
>
>I have a simple web server using  BaseHTTPServer, and the def do_POST
>(self) function works fine for regular forms that are submitted to it,
>but when I send an AJAX POST to it it does nothing (I've tried to just
>get it to print to check it's nothing else but it doesn't even do
>that, although it does for a regular POST request.

Are you absolutely sure your AJAX request is being sent with Content-Type
multipart/form-data?  Your code would explode silently if it didn't,
because "query" would not exist when you got to "print(query.get('data'))",
and your blanket "except" would hide the error.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From ptmcg at austin.rr.com  Tue Feb 10 02:38:01 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Mon, 9 Feb 2009 23:38:01 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com> 
	<mailman.9205.1234248235.3487.python-list@python.org>
Message-ID: <d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>

On Feb 10, 12:43?am, Chris Rebert <c... at rebertia.com> wrote:
> Considering the GIL, I highly doubt it so. Also, the algorithm is
> fundamentally linear -- each result depends on previous results -- so
> I don't think you can easily parallelize it (if at all). You'd
> probably get greater speedup using memoization.
>
Even worse than linear, the function is recursive, which as I
understand it, is inherently a no-no when looking for code that is
parallel-friendly.

If you want multi-core to have some benefit, then your program must
have a way for separate parts of the problem to be processed
independently.  Many matrix processing problems fall into this camp,
since the various cells of the matrix can be worked on separately from
all others.  Prime number searchers break up a problem by having
separate processes scan different number ranges independently, or have
multiple processes perform rough pass prime filters, who write
possible primes to another queue to be more exhaustively checked.
This saves the expensive/exhaustive check from being done on every
number.  Fractal graphics generators (Mandelbrot set plots) can break
up the graphics range among different processors, or keep a "queue" of
pixels to generate, and each calculator process pulls from the queue
until all pixels are computed (some pixels take longer to compute than
others).

-- Paul




From http  Tue Feb 10 02:48:44 2009
From: http (Paul Rubin)
Date: 09 Feb 2009 23:48:44 -0800
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
Message-ID: <7xwsby7mw3.fsf@ruckus.brouhaha.com>

In case anyone is interested: Gideon Smeding of the University of
Utrecht has written a masters' thesis titled "An executable
operational semantics for Python".  It is actually a formal semantics
for a Python subset called minpy.  Per the blurb, the semantics are
described in literate Haskell that is compiled to an interpreter as
well as a formal specification.  Somehow there has to be a a reference
about "unless you're Dutch" to be made about this ;-).

Further info is at:
http://gideon.smdng.nl/2009/01/an-executable-operational-semantics-for-python/

I found this link via the Haskell Weekly News, http://sequence.complete.org .


From mail at microcorp.co.za  Tue Feb 10 02:48:53 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 09:48:53 +0200
Subject: Simple question - stock market simulation
References: <6d242a86-c0bc-4c1d-8c38-b263e128bd02@n33g2000pri.googlegroups.com><7xljsgyzn5.fsf@ruckus.brouhaha.com><1c244978-3224-4a5c-a9d9-60cb2337660e@x6g2000pre.googlegroups.com>
	<mailman.9129.1234167149.3487.python-list@python.org>
	<3781c7ab-9801-4680-909c-3d264b80a17f@a12g2000pro.googlegroups.com>
Message-ID: <015201c98b57$8c4c5c40$0d00a8c0@hendrik>

"cptn.spoon" <cpt..n.... at gmail.com> wrote:
On Feb 9, 6:48 pm, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:

>> No.
>> At this level, just use a list of instances of your Stock class.
>>
>> - Hendrik
>
>How do I get a list of instances of a particular class? Is there a way
>to do this dynamically?

Yes there is. First make an empty list:

stock_market = []

Now when you create the instance:

stuff = GetStuffFromTheUserIfNecessary()
stock_market.append(Stock(stuff))

This leaves the new instance in the last position in the list.

When you have done that as many times as you wanted, 
to create the stocks in the market, you can do:

for stock in stock_market:
    DoThingsWithThisOneStock(stock)

>
>Also, what would be the way of dynamically creating an instance of a
>class based on user input (ie a user wants to create a new instance of
>the Stock class via shell input)?

This means your program must be looking for that input.
Either look at thread and threading, or write a simple
loop that gets input, appends a stock, gets more input
if required, does something with all the stocks, and
either loops or terminates. Or some variation of that
like first building the market and then manipulating it.

>
>I'm not sure if I have the wrong mindset here.
>

I honestly cannot tell if your mindset is right or
wrong - I suppose it depends on your definitions
of the two terms.
:-)
- Hendrik




From mail at microcorp.co.za  Tue Feb 10 03:07:56 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 10:07:56 +0200
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com><slrngooe42.c1v.grahn+nntp@frailea.sa.invalid><557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com><mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
Message-ID: <015301c98b57$8cec93e0$0d00a8c0@hendrik>

"Spacebar265" <spac.. at gmail.com> wrote:

>Thanks. How would I do separate lines into words without scanning one
>character at a time?

Type the following at the interactive prompt and see what happens:

s = "This is a string composed of a few words and a newline\n"
help(s.split)
help(s.rstrip)
help(s.strip)
dir(s)

- Hendrik




From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 03:12:30 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 08:12:30 GMT
Subject: Variable + String Format
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
	<01a1281b$0$7503$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 18:52:40 +1100, Joel Ross wrote:

> Thanks for the quick response guys. Help me out a alot. I'm a newbie to
> python and your replies help me understand a bit more about python!!

Joel, unless you have Guido's time machine and are actually posting from 
the future, the clock, or possibly the time zone, on your PC is set 
wrong. 


-- 
Steven





From gweis at gmx.at  Tue Feb 10 03:18:23 2009
From: gweis at gmx.at (Gerhard Weis)
Date: Tue, 10 Feb 2009 18:18:23 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a12e1d$0$30497$c3e8da3@news.astraweb.com>

Once I have seen Haskell code, that ran fibonacci on a 4 core system.

The algorithm itself basically used an extra granularity paramet until 
which new threads will be sparked. e.g. fib(40, 36) means, calculate 
fib(40) and spark threads until n=36.
1. divide: fib(n-1), fib(n-2)
2. divide: fib(n-2), fib(n-3)
3. divide: fib(n-3), fib(n-4)

We tried this code on a 4 core machine using only 1 core and all 4 cores.
1 core wallclock: ~10s
4 core wallclock: ~3s

So there is a signifcant speedup, but I guess, this only works with 
Haskell out of the box.
I have not tried it, but I think you can simulate Haskell's behaviour, 
by caching the results of fib(n).
(We tried the same algorithm in Java. While it utilized all 4 cores, 
there was no speedup. This is why I think, that result caching is the 
only way to speedup fibonacci.

cheers

Gerhard


On 2009-02-10 17:34:54 +1000, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:
> 
>> I mean this
>> [code]
>> def fib(n):
>> if n<=1:
>> return 1
>> return fib(n-1)+fib(n-2)
>> 
>> useCore(1)
>> timeit(fib(500)) #this show 20 seconds
>> 
>> useCore(2)
>> timeit(fib(500)) #this show 10 seconds [/code]
>> 
>> Is it possible?
> 
> What does useCore(n) mean?
> 
> 
>> and more, can threads/multi-processors/clusters be used to improve fib?
> 
> No. The best way to improve fib is to improve fib, not to try running it
> on faster hardware.
> 
> Your algorithm makes *many* recursive calls to fib() for each call:
> 
> fib(1) => 1 function call
> fib(2) => 3 function calls
> fib(3) => 5 function calls
> fib(4) => 9 function calls
> fib(5) => 15 function calls
> fib(6) => 25 function calls
> fib(7) => 41 function calls
> fib(8) => 67 function calls
> fib(9) => 109 function calls
> ...
> fib(34) => 18454929 function calls
> fib(35) => 29860703 function calls
> fib(36) => 48315633 function calls
> ...
> fib(498) => 1.723e+104 function calls
> fib(499) => 2.788e+104 function calls
> fib(500) => 4.511e+104 function calls
> 
> Calling fib(500) the way you do will make more than 450 thousand billion
> billion billion billion billion billion billion billion billion billion
> billion function calls. You claim that you calculated it in just 20
> seconds. On my PC, it takes over a minute to calculate fib(38). I
> estimate it would take over five hours to calculate fib(50), and fib(100)
> would probably take 16 million years. I call shenanigans.




From gagsl-py2 at yahoo.com.ar  Tue Feb 10 03:19:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 06:19:18 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<mailman.9200.1234236604.3487.python-list@python.org>
	<2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>
Message-ID: <op.uo4mqgmox6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 03:26:20 -0200, Michele Simionato  
<michele.simionato at gmail.com> escribi?:
> On Feb 10, 4:29?am, "Gabriel Genellina"

>> > Honestly, I don't understand how this thing got so much out of
>> > control. If anyone starts an intelligent question or remark about
>> > super, this essay is thrown in no matter what. Anyone can explain why?
>>
>> Because for a very loooooong time (seven years, 2001-2008) super was ?
>> almost undocumented. The Library Reference -before release 2.6- only  
>> had a ?
>> short paragraph, the online documentation referred (and still does) to  
>> the ?
>> original essay by Guido introducing descriptors, which is inaccurate  
>> and ?
>> outdated, and then the "... harmful" article was the only source of ?
>> information available.
>
> All right. This is way I made the effort of writing a comprehensive
> collection of all the tricky points about super
> I knew:
>
> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
> http://www.artima.com/weblogs/viewpost.jsp?thread=236278
> http://www.artima.com/weblogs/viewpost.jsp?thread=237121

You really should push them to be included in python.org, even in their  
unfinished form. (At least a link in the wiki pages). Their visibility is  
almost null now.
They're very clearly written - I wish you had published them years ago!

> Also see this thread on python-dev about the issue of super
> documentation: http://www.gossamer-threads.com/lists/python/dev/673833

Apart from a few remarks in the first posts, there is little criticism of  
your articles themselves. Looks like adding a section about Python 3 is  
the only important pending issue - again, you really should publish the  
series in a more prominent place.

-- 
Gabriel Genellina



From jef.mangelschots at gmail.com  Tue Feb 10 03:40:15 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Tue, 10 Feb 2009 00:40:15 -0800 (PST)
Subject: import wx works interactive but not from script
Message-ID: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>

when I call "import wx" from the interactive console, it works (i.e.
it doesn't complain).
But when I call the same from a script, it complains that it can not
find the wx module.

------------works for interactive----------------------------
Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
>>>

------------does not work frm script--------------------------
Traceback (most recent call last):
  File "c:\temp\myscript.py", line 4, in <module>
    import wx
ImportError: No module named wx


I run Vista Home premium 64bit. Python 2.6.1 (the 32-bit version).
I installed the latest 32-bit ANSI version of wxpython. (http://
downloads.sourceforge.net/wxpython/wxPython2.8-win32-ansi-2.8.9.1-
py26.exe)
In the folder C:\Python26\Lib\site-packages, I find a wx.pth file with
a single line in there: "wx-2.8-msw-ansi"
in that same directory is a folder named "wx-2.8-msw-ansi" and it
contains a subdirectory called "wx" with what appears to be the
regular wx libary stuff, including __init__.py
My PATH starts with C:\Python26;C:\Python26\Scripts;C:\Python26\lib;

any idea's ?








From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 03:45:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 08:45:37 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:

> Once I have seen Haskell code, that ran fibonacci on a 4 core system.
> 
> The algorithm itself basically used an extra granularity paramet until
> which new threads will be sparked. e.g. fib(40, 36) means, calculate
> fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
> 2. divide: fib(n-2), fib(n-3)
> 3. divide: fib(n-3), fib(n-4)
> 
> We tried this code on a 4 core machine using only 1 core and all 4
> cores. 1 core wallclock: ~10s
> 4 core wallclock: ~3s

Three seconds to calculate fib(40) is terrible. Well, it's a great saving 
over ten seconds, but it's still horribly, horribly slow.

Check this out, on a two-core 2.2 GHz system:


>>> import timeit
>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
7.2956085205078125e-05

That's five orders of magnitude faster. How did I do it? I used a better 
algorithm.


def fib(n, a=1, b=1):
    if n==0:
        return a
    elif n==1:
        return b
    return fib(n-1, b, a+b)


And for the record:

>>> fib(500)
225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
0.00083398818969726562

Less than a millisecond, versus millions of years for the OP's algorithm. 
I know which I would choose. Faster hardware can only go so far in hiding 
the effect of poor algorithms.



-- 
Steven


From mail at microcorp.co.za  Tue Feb 10 03:47:32 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 10 Feb 2009 10:47:32 +0200
Subject: Problem with Tkinter's scale function.
References: <97c1d5380902092336x2289dfcyebf38ba933a53b81@mail.gmail.com>
Message-ID: <01a301c98b5d$0708b3c0$0d00a8c0@hendrik>


Nicholas Feinberg wrote:


>Code that caused the problem (unlikely to be helpful, but no reason not to
include it):
>self.canvas.scale(self.body,self.radius/(self.radius-.5),self.radius/(self.radi
us-.05),0,0)#radius is greater than .5

scale's arguments are:

scale(TagOrID,xorigen,yorigen,xscale,yscale)

You seem to be moving the thing and scaling it to zero...

- Hendrik



From mail at timgolden.me.uk  Tue Feb 10 04:10:18 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 09:10:18 +0000
Subject: import wx works interactive but not from script
In-Reply-To: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
Message-ID: <4991447A.9030801@timgolden.me.uk>

jefm wrote:
> when I call "import wx" from the interactive console, it works (i.e.
> it doesn't complain).
> But when I call the same from a script, it complains that it can not
> find the wx module.
> 
> ------------works for interactive----------------------------
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import wx
>>>>
> 
> ------------does not work frm script--------------------------
> Traceback (most recent call last):
>   File "c:\temp\myscript.py", line 4, in <module>
>     import wx
> ImportError: No module named wx


Do you have only the one version of Python on this
machine? Did you upgrade from, eg, Python2.5? And
are you running this script by, eg, double-clicking
on it / running it from the command prompt with the
script name alone? If so, check that ftype python.file
shows that .py files are associated with the version
of Python you expect.

TJG


From phillip.oldham at gmail.com  Tue Feb 10 04:26:46 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Tue, 10 Feb 2009 01:26:46 -0800 (PST)
Subject: Convert date/time to unix timestamp?
Message-ID: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>

Is there a simple way to set a date/time and convert it to a unix
timestamp? After some googling I found the following:

t = datetime.time(7,0,0)
starttime = time.mktime(t.timetuple())+1e-6*t.microsecond

That seems like very long-winded. Is there an easier way? I've read
the docs on the datetime and time modules, but nothing's jumping out
at me.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 04:32:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 07:32:35 -0200
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo4p4lk7x6zn5v@gabriel.sleipnir-bsas>

En Tue, 10 Feb 2009 06:45:37 -0200, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> escribi?:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
>
>> We tried this code on a 4 core machine using only 1 core and all 4
>> cores. 1 core wallclock: ~10s
>> 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
>
>>>> import timeit
>>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
>
> def fib(n, a=1, b=1):
>     if n==0:
>         return a
>     elif n==1:
>         return b
>     return fib(n-1, b, a+b)

I agree with your comment, but this is not the right way to write it in  
Python. This style is fine in a language with tail-call optimization --  
but fib(1000) raises `RuntimeError: maximum recursion depth exceeded`

The same thing after removing recursion can compute the 2089 digits of  
fib(10000) without problems:

def fib(n):
     a = b = 1
     while n:
       n, a, b = n-1, b, a+b
     return a

> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

Completely agree!

-- 
Gabriel Genellina



From bj_666 at gmx.net  Tue Feb 10 04:42:57 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 10 Feb 2009 09:42:57 GMT
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
Message-ID: <6vd0h1Fjele5U1@mid.uni-berlin.de>

On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:

> Jean-Paul Calderone <exarkun <at> divmod.com> writes:
>> Consider whether you really need to use super().
>> 
>> http://fuhm.net/super-harmful/
> 
> This article chiefly deals with super()'s harm in multiple inteheritance
> situations. For the simple case, though, like that presented by the OP,
> I believe super() is perfect.

But for the simple cases it is unnecessary because it was invented to 
deal with multiple inheritance problems.

Ciao,
	Marc 'BlackJack' Rintsch


From clp2 at rebertia.com  Tue Feb 10 04:43:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 01:43:20 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0902100143s3289ca44g2a9a84f3192f6aa@mail.gmail.com>

On Tue, Feb 10, 2009 at 12:45 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
>
>> Once I have seen Haskell code, that ran fibonacci on a 4 core system.
>>
>> The algorithm itself basically used an extra granularity paramet until
>> which new threads will be sparked. e.g. fib(40, 36) means, calculate
>> fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
>> 2. divide: fib(n-2), fib(n-3)
>> 3. divide: fib(n-3), fib(n-4)
>>
>> We tried this code on a 4 core machine using only 1 core and all 4
>> cores. 1 core wallclock: ~10s
>> 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
>
>>>> import timeit
>>>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
>
> def fib(n, a=1, b=1):
>    if n==0:
>        return a
>    elif n==1:
>        return b
>    return fib(n-1, b, a+b)
>
>
> And for the record:
>
>>>> fib(500)
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
>>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
> 0.00083398818969726562
>
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

Indeed. And apparently memoization can hide it also:

$ #memoization added to OP's code
$ python -m timeit -s 'from memoized_naive_recursive_version import
fib' 'fib(40)'
1000000 loops, best of 3: 0.639 usec per loop
$ #your code
$ python -m timeit -s 'from your_version import fib' 'fib(40)'
100000 loops, best of 3: 15.4 usec per loop
$ cat memoized_naive_recursive_version.py
def memoize(func):
    cache = {}
    def memoized(*args):
        if args in cache:
            return cache[args]
        else:
            result = func(*args)
            cache[args] = result
            return result
    return memoized

@memoize
def fib(n):
    if n <= 1:
        return 1
    else:
        return fib(n-1) + fib(n-2)

However, the naive recursive version fails by exceeding the maximum
recursion depth if N is too large, whereas your version continues to
succeed for a much higher limit of N.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gh at ghaering.de  Tue Feb 10 04:47:17 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Tue, 10 Feb 2009 10:47:17 +0100
Subject: Which core am I running on?
In-Reply-To: <c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>
References: <2847e691-fbf6-433e-ae71-839dc708073f@t11g2000yqg.googlegroups.com>	<mailman.9136.1234182305.3487.python-list@python.org>
	<c1b3f91f-2468-4fc3-9675-1db0c8124493@o11g2000yql.googlegroups.com>
Message-ID: <gmrif5$g7q$1@ger.gmane.org>

psaffrey at googlemail.com wrote:
> On 9 Feb, 12:24, Gerhard H?ring <g... at ghaering.de> wrote:
>> http://objectmix.com/python/631346-parallel-python.html
>>
> 
> Hmm. In fact, this doesn't seem to work for pp. When I run the code
> below, it says everything is running on the one core.
> 
> import pp
> import random
> import time
> from string import lowercase
> 
> ncpus = 3
> 
> def timedCharDump(waittime, char):
> 	time.sleep(waittime)
> 	mycore = open("/proc/%i/stat" % os.getpid()).read().split()[39]
> 	print "I'm doing stuff!", mycore, char
> 	return char
> 
> job_server = pp.Server(ncpus, ppservers=())
> 
> jobdetails = [ (random.random(), letter) for letter in lowercase ]
> 
> jobs = [ job_server.submit(timedCharDump,(jinput1, jinput2), (),
> ("os", "time",)) for jinput1, jinput2 in jobdetails ]
> 
> for job in jobs:
> 	print job()

Quick look again found this:

http://brokestream.com/procstat.html

I guess I counted wrong and it's actually column 38, not 39.

-- Gerhard



From joelc at cognyx.com  Tue Feb 10 05:03:06 2009
From: joelc at cognyx.com (Joel Ross)
Date: Tue, 10 Feb 2009 21:03:06 +1100
Subject: Variable + String Format
Message-ID: <019ff536$0$20657$c3e8da3@news.astraweb.com>

Hi all,

I have this piece of code:
#########################################################################

wordList = "/tmp/Wordlist"
file = open(wordList, 'r+b')


def readLines():

         for line in file.read():
             if not line: break
             print line + '.com '
             return line



readLines()
file.close()

##########################################################################

It returns the results:

t.com

NOTE: Only returns the first letter of the first word on the first line 
e.g. test would only print t and readline() does the same thing.

I have also tried readlines() which gives me the result:

test
.com

The file Wordlist has one word on each line for example

test
test1
test2

I need it to loop though the Wordlist file and print/return the results

test.com
test1.com
test2.com

I'm just looking for a point in the right direction.

Much Thanks

JOelC


From ringogarcia at gmail.com  Tue Feb 10 05:03:09 2009
From: ringogarcia at gmail.com (Nacho)
Date: Tue, 10 Feb 2009 02:03:09 -0800 (PST)
Subject: Setting DNS using win32com
Message-ID: <394007a3-d85b-4d6c-9825-a4db2add8df3@f20g2000yqg.googlegroups.com>

I am trying to make a small python application to change DNS servers
in a small LAN.

I am trying this code but I don't manage it to work, I only get the
values removed.

My code is this:

import win32com.client

objWMIService = win32com.client.GetObject("winmgmts:
{impersonationLevel=impersonate}!\\\\" + strComputer + "\\root\
\cimv2")
nicList = objWMIService.ExecQuery("SELECT * FROM
Win32_NetworkAdapterConfiguration WHERE IPEnabled = True")

for nic in nicList:
    nic.DNSServerSearchOrder = (u'1.2.3.4', u'2.3.4.5')
    nic.SetDNSServerSearchOrder

nic.SetDNSServerSearchOrder returns 0 so it is supposed to have been
done correctly, but no DNS Server is found in the Network Properties.

I don't know what I am doing wrong so any hint or any documentation
about this would be appreciated.

Thank you by now.



From niklas.norrthon at hotmail.com  Tue Feb 10 05:05:35 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Tue, 10 Feb 2009 02:05:35 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org> 
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com> 
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>

On 10 Feb, 09:45, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 18:18:23 +1000, Gerhard Weis wrote:
> > Once I have seen Haskell code, that ran fibonacci on a 4 core system.
>
> > The algorithm itself basically used an extra granularity paramet until
> > which new threads will be sparked. e.g. fib(40, 36) means, calculate
> > fib(40) and spark threads until n=36. 1. divide: fib(n-1), fib(n-2)
> > 2. divide: fib(n-2), fib(n-3)
> > 3. divide: fib(n-3), fib(n-4)
>
> > We tried this code on a 4 core machine using only 1 core and all 4
> > cores. 1 core wallclock: ~10s
> > 4 core wallclock: ~3s
>
> Three seconds to calculate fib(40) is terrible. Well, it's a great saving
> over ten seconds, but it's still horribly, horribly slow.
>
> Check this out, on a two-core 2.2 GHz system:
>
> >>> import timeit
> >>> timeit.Timer('fib(40)', 'from __main__ import fib').timeit(1)
>
> 7.2956085205078125e-05
>
> That's five orders of magnitude faster. How did I do it? I used a better
> algorithm.
>
> def fib(n, a=1, b=1):
> ? ? if n==0:
> ? ? ? ? return a
> ? ? elif n==1:
> ? ? ? ? return b
> ? ? return fib(n-1, b, a+b)
>
> And for the record:
>
> >>> fib(500)
>
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L

According to the common definition of fibonacci numbers fib(0) = 0, fib
(1) = 1 and fib(n) = fib(n-1) + fib(n-2) for n > 1. So the number
above is fib(501).

>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
>
> 0.00083398818969726562

And now for my version (which admitedly isn't really mine, and returns
slightly incorrect fib(n) for large values of n, due to the limited
floating point precision).

>>> import math
>>> sqrt5 = math.sqrt(5)
>>> golden_section = (sqrt5 + 1) / 2
>>> def fib(n):
	return int(golden_section ** n / sqrt5 + 0.5)

>>> fib(501)
225591516161940121919323945317755919750165306733355143970858461525064153963081278412888159063487104942080L

>>> timeit.Timer('fib(501)', 'from __main__ import fib').timeit(1)
1.9555558083084179e-05

>
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.
>

I agree 100%

/Niklas Norrthon


From michele.simionato at gmail.com  Tue Feb 10 05:11:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 10 Feb 2009 02:11:10 -0800 (PST)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com> 
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
Message-ID: <34d373ad-52d2-4d38-94b7-d566a5a5dd58@s20g2000yqh.googlegroups.com>

On Feb 10, 10:42?am, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> >> Consider whether you really need to use super().
>
> >>http://fuhm.net/super-harmful/
>
> > This article chiefly deals with super()'s harm in multiple inteheritance
> > situations. For the simple case, though, like that presented by the OP,
> > I believe super() is perfect.
>
> But for the simple cases it is unnecessary because it was invented to
> deal with multiple inheritance problems.
>
> Ciao,
> ? ? ? ? Marc 'BlackJack' Rintsch

Unfortunately there is no good solution. If you have a single
inheritance hierarchy and you do
not use super, you make it impossible for users of your hierarchy to
subclass it by using multiple inheritance in a cooperative way (this
is not polite).
OTOH, if you user super, your users must know about it, to avoid
unexpected cooperation. It is all explained in the "super harmful"
paper, which is a must read even if you only use single inheritance.


From greg at cosc.canterbury.ac.nz  Tue Feb 10 05:57:51 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Tue, 10 Feb 2009 23:57:51 +1300
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <mailman.9130.1234171952.3487.python-list@python.org>
References: <6va201FijdteU1@mid.individual.net>
	<mailman.9130.1234171952.3487.python-list@python.org>
Message-ID: <49915DAF.9080901@cosc.canterbury.ac.nz>

Mark Hammond wrote:

> What problems specifically?  The only practical problems you should see 
> will arise if you try and pass a "FILE *", or allocate memory you then 
> ask python to free (or vice-versa) - both should be avoidable though...

It concerns a Ruby plugin for Sketchup that embeds a Python
interpreter and acts as a bridge between Ruby and Python.
I'm using Sketchup 7 which uses msvcrt80.dll, and includes
a Ruby dll which is presumably also linked against that
crt.

I've made some progress on the issue. One problem turned out to
be a result of allocating something with ruby_xmalloc() and
freeing it with free(), which was easy to fix.

Another one seemed to be something to do with trying to use
a global var that points to the current Ruby stack frame. I
don't really know what was happening, but I found another way
of doing things that sidestepped the issue.

I've now got it working, at first sight anyhow, using Python 2.3.

But it doesn't work properly with Python 2.5. The problem
appears to be related to compiling .py files to .pyc. The
first time I run it and try to import a module, a .pyc is
generated, but then a crash occurs when trying to call one
of the functions imported from it. If I run it a second time,
with the previously generated .pyc in place, it runs successfully.

Which makes me think it may be some kind of FILE * problem,
but I'm not sure what, since all the stdio operations on
the files concerned should be getting done by Python.

To add insult to injury, it's proving to be very difficult
to debug, because Sketchup seems to crash all on its own
when run under gdb on Windows, even when I don't load any
of my code. So I can't get a traceback of where the crash
is occurring.

There's one possibility I just thought of -- Python may
be trying to write something to stdout or stderr, in which
case it will probably be using the wrong crt to do it.
Something to look into after I've got some sleep...

-- 
Greg


From crculver at christopherculver.com  Tue Feb 10 06:33:35 2009
From: crculver at christopherculver.com (Christopher Culver)
Date: Tue, 10 Feb 2009 13:33:35 +0200
Subject: Converting timestamps across timezones
Message-ID: <87tz72wmpc.fsf@christopherculver.com>

A script that I'm writing pulls the system time off of an iPod
connected to the computer. The iPod's time is represented as a Unix
timestamp (seconds since the epoch), but this timestamp does not
represent UTC time, but rather the local timezone of the owner. I need
to convert this local time timestamp into a UTC timestamp by referring
to the timezone specified by /etc/localtime on the computer.

I've read through the docs, but I'm rather lost on how to pull this
particular operation off. Any advice would be appreciated.


From duncan.booth at invalid.invalid  Tue Feb 10 07:06:06 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Feb 2009 12:06:06 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9BAE798A293F9duncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
> 
>> How would I do separate lines into words without scanning one character
>> at a time?
> 
> Scan a line at a time, then split each line into words.
> 
> 
> for line in open('myfile.txt'):
>     words = line.split()
> 
> 
> should work for a particularly simple-minded idea of words.
> 
Or for a slightly less simple minded splitting you could try re.split:

>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']


-- 
Duncan Booth http://kupuguy.blogspot.com


From pauljefferson at gmail.com  Tue Feb 10 07:27:51 2009
From: pauljefferson at gmail.com (Paul)
Date: Tue, 10 Feb 2009 04:27:51 -0800 (PST)
Subject: AJAX Post requests
References: <3d4fc3a0-671f-4635-b113-80669c9e6e6d@o11g2000yql.googlegroups.com>
	<7ib2p4lrhmlhr4gr0ifmvgdi24sp2dm309@4ax.com>
Message-ID: <c67844ce-f53e-488e-b21b-20686a423ce3@v42g2000yqj.googlegroups.com>

On Feb 10, 7:37?am, Tim Roberts <t... at probo.com> wrote:
> PJ <pauljeffer... at gmail.com> wrote:
>
> >I have a simple web server using ?BaseHTTPServer, and the def do_POST
> >(self) function works fine for regular forms that are submitted to it,
> >but when I send anAJAXPOST to it it does nothing (I've tried to just
> >get it to print to check it's nothing else but it doesn't even do
> >that, although it does for a regular POST request.
>
> Are you absolutely sure yourAJAXrequest is being sent with Content-Type
> multipart/form-data? ?Your code would explode silently if it didn't,
> because "query" would not exist when you got to "print(query.get('data'))",
> and your blanket "except" would hide the error.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

Thankyou for that - you're right - I'm new to AJAX so it's taking me a
bit of time to get used to it - its an application data type being
submitted


From bearophileHUGS at lycos.com  Tue Feb 10 07:29:07 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 10 Feb 2009 04:29:07 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
	<7xwsby7mw3.fsf@ruckus.brouhaha.com>
Message-ID: <1732ba01-6096-4d38-a09d-fe1fbe75b435@l1g2000yqj.googlegroups.com>

Paul Rubin:
> Gideon Smeding of the University of
> Utrecht has written a masters' thesis titled "An executable
> operational semantics for Python".

A significant part of Computer Science is a waste of time and money.

Bye,
bearophile


From durumdara at gmail.com  Tue Feb 10 07:29:50 2009
From: durumdara at gmail.com (durumdara)
Date: Tue, 10 Feb 2009 13:29:50 +0100
Subject: STMP, mail, sender-from, to-bcc-addr
Message-ID: <4991733E.4040608@gmail.com>

Hi!

I wanna ask that have anyone some experience with email.msg and smtplib?

The email message and smtp.send already have "sender/from" and 
"recip/addr to".
Possible the smtp components does not uses the email tags if I not 
define them only in the message?

Can I do same thing as in GMAIL that the mail does not have TO, only BCC 
tags/recipients, and no one of the recipients who knows about the each 
others?

Thanks:
    dd



From andrew at acooke.org  Tue Feb 10 07:30:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 09:30:05 -0300 (CLST)
Subject: generator object or 'send' method?
In-Reply-To: <pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <996d9fdfe31fb995b8c616e90a6eff79.squirrel@acooke.dyndns.org>


steven probably knows this, but to flag the issue for people who are
looking at generators/coroutines for the first time: there's a little
"gotcha" about exactly how the two sides of the conversation are
synchronized.  in simple terms: send also receives.

unfortunately the example steven gave doesn't really show this, so i've
modified it below.  you can now see that the first next() after .send()
receives 2, not 1.  note that i am using python 3, so the .next() method
is .__next__() (the asymmetry between next and send seems odd to me, but
there you go).

(in a sense this is completely logical, but if you're used to the
asynchronous way the internet works, it can seem unintuitive)

how to handle this was one of the things the original post was asking
about (if i understood correctly).

>>> def gen(n):
...   while True:
...     obj = yield n
...     n += 1
...     if obj is not None: n = obj
...
>>> g = gen(5)
>>> next(g)
5
>>> g.__next__()
6
>>> g.send(1)
1
>>> next(g)
2

andrew


Steven D'Aprano wrote:
> On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:
>> I would love to see a simple code example of this if you have one; I've
>> been wanting to do this but couldn't even get started.
>
> Is this too simple?
>
>>>> def gen(n):
> ...     while True:
> ...             obj = yield n
> ...             if obj is not None: n = obj
> ...
>>>> g = gen(5)
>>>> g.next()
> 5
>>>> g.next()
> 5
>>>> g.send(12)
> 12
>>>> g.next()
> 12




From joelc at cognyx.com  Tue Feb 10 07:35:33 2009
From: joelc at cognyx.com (Joel Ross)
Date: Tue, 10 Feb 2009 23:35:33 +1100
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <01a16a69$0$7503$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code:
> #########################################################################
> 
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
> 
> 
> def readLines():
> 
>         for line in file.read():
>             if not line: break
>             print line + '.com '
>             return line
> 
> 
> 
> readLines()
> file.close()
> 
> ##########################################################################
> 
> It returns the results:
> 
> t.com
> 
> NOTE: Only returns the first letter of the first word on the first line 
> e.g. test would only print t and readline() does the same thing.
> 
> I have also tried readlines() which gives me the result:
> 
> test
> .com
> 
> The file Wordlist has one word on each line for example
> 
> test
> test1
> test2
> 
> I need it to loop though the Wordlist file and print/return the results
> 
> test.com
> test1.com
> test2.com
> 
> I'm just looking for a point in the right direction.
> 
> Much Thanks
> 
> JOelC


THAT'S BETTER!!! :)


From gerhard at proclos.com  Tue Feb 10 07:41:25 2009
From: gerhard at proclos.com (Gerhard Weis)
Date: Tue, 10 Feb 2009 22:41:25 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a16bc0$0$20660$c3e8da3@news.astraweb.com>

> def fib(n, a=1, b=1):
>     if n==0:
>         return a
>     elif n==1:
>         return b
>     return fib(n-1, b, a+b)
> 
> 
> And for the record:
> 
>>>> fib(500)
> 225591516161936330872512695036072072046011324913758190588638866418474627738686883405015987052796968498626L
timeit.Timer('fib(500)', 
> 
>>>> 'from __main__ import fib').timeit(1)
> 0.00083398818969726562
> Less than a millisecond, versus millions of years for the OP's algorithm.
> I know which I would choose. Faster hardware can only go so far in hiding
> the effect of poor algorithms.

I agree to 100% to this.

btw. the timeings are not that different for the naive recursion in 
OP's version and yours.
fib(500) on my machine:
	OP's: 0.00116 (far away from millions of years)
	This here: 0.000583
	Gabriel's while loop: 0.000246

The fastest algorithm I've found does fib(1000000) in .25seconds on my machine.
However, I have not found a way to parallelize this algorithm and I 
think it is not possible.

To come back to the original question. Yes it is possible; however 
there are quite some restrictions about it. In case of the naive 
recursion it was possible to get a speedup of more than 3 times on a 4 
core machine. With the highly optimised version mentioned above, I had 
no success in utilizing more than one core.

As conclusion I would say, Yes, a single function can profit from 
multiple cores, but sometimes a better algorithm delivers better 
results than using more cores. However, it is possible that a slower 
but parallelizable algorithm might outperform the best serial 
algorithm, with enough cores :).

Gerhard



From thomas.kraus at merz-akademie.de  Tue Feb 10 07:42:17 2009
From: thomas.kraus at merz-akademie.de (Thomas Kraus)
Date: Tue, 10 Feb 2009 13:42:17 +0100
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <gmrsrp$vvr$1@news01.versatel.de>

Phillip B Oldham schrieb:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
> 
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
> 
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.

The built-in function time.localtime() returns a 9-item tuple, e.g. 
(2009, 2, 10, 13, 29, 7, 1, 41, 0).

time.mktime() converts this tuple to the seconds since the Epoch as a 
floating point number, int() converts it to an integer.

int(time.mktime(time.localtime()))

--
Thomas


From lie.1296 at gmail.com  Tue Feb 10 07:43:20 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 10 Feb 2009 12:43:20 +0000 (UTC)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
Message-ID: <gmrsp8$eb4$1@ger.gmane.org>

On Tue, 10 Feb 2009 14:28:15 +0800, oyster wrote:

> I mean this
> [code]
> def fib(n):
>     if n<=1:
>         return 1
>     return fib(n-1)+fib(n-2)
> 
> useCore(1)
> timeit(fib(500)) #this show 20 seconds
> 
> useCore(2)
> timeit(fib(500)) #this show 10 seconds [/code]
> 
> Is it possible?
> 
> and more, can threads/multi-processors/clusters be used to improve fib?
> 
> thanx

Of course multi-core processor can improve single function using 
multiprocessing, as long as the function is parallelizable. The Fibonacci 
function is not a parallelizable function though.

However, there are ways to improve your fibonacci function. Either put 
off the recursion or implement a memoization. An imperative fibonacci is 
much faster than a naive recursion one because a naive recursive 
fibonacci function is O(2**n) while the imperative one O(n). Memoization 
must be used to help recursive fibonacci to become O(n).



From andrew at acooke.org  Tue Feb 10 08:00:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 10:00:37 -0300 (CLST)
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <07563d777dbc68c9315b2c3d32d98e43.squirrel@localhost>


the python routines are a bit basic - you really have to think quite hard
about what you are doing to get the right answer.

in your case, you need to be clear what the timezone is for the datetime
you are using.  timezone info is optional (see the datetime documentation,
where it talks about "naive" and "aware" objects).

anyway, ignoring that, i think you need the very useful, but oddly
located, calendar.timegm().

andrew


Phillip B Oldham wrote:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
>
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
>
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From lie.1296 at gmail.com  Tue Feb 10 08:03:41 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 10 Feb 2009 13:03:41 +0000 (UTC)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
	<7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>
Message-ID: <gmrtvd$eb4$2@ger.gmane.org>

On Tue, 03 Feb 2009 20:08:34 -0800, Stephen Hansen wrote:

> There is no need to try to make sure something is
> executed/compiled only once in Python like you may want to do in C.
> Every module is only ever compiled once: if you import it ten times in
> ten different places only the first will compile and execute the code,
> the rest of the calls will return that original module again.

<nitpick>
If you import a module, it will be recompiled only if the module changes 
from the precompiled .pyc/.pyo. OTOH, if you run a module, it will be 
recompiled every time even if there is no change.
</nitpick>



From jldunn2000 at googlemail.com  Tue Feb 10 08:06:18 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 05:06:18 -0800 (PST)
Subject: python ssh and Tetia SSH server
Message-ID: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>

Anyone out there any experience of using python ssh modules to connect
to the Tetia SSH server from SSH (ssh.com)?





From ferdinandsousa at gmail.com  Tue Feb 10 08:22:24 2009
From: ferdinandsousa at gmail.com (Ferdinand Sousa)
Date: Tue, 10 Feb 2009 18:52:24 +0530
Subject: COM and threading, "CoInitialize"?
Message-ID: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>

Greetings to list members,

I am trying to use an Acrobat COM object in a class that is subclassed from
threading.Thread.
Since threading.Thread is subclassed, the __init__ method of the inheriting
class must explicitly call the threading.Thread.__init__ method of the
parent. I guess I'm missing something similar for the COM object. Threading
code and traceback below. Any pointers?

CODE:
=================================
class process_file(threading.Thread):

    def __init__(self,connection):
        threading.Thread.__init__(self)
        self.connection=connection

    def run(self):
        ####
        irrelevant code here
        ####

        # Acrobat COM starts
        AVD = win32com.client.Dispatch('AcroExch.AVDoc')   # Traceback
refers to this line (89)
        pdfname=pdfname.replace('.pdf',PDFNAME_SUFFIX)
        AVD.Open(pdf.name, pdfname) # ////////
        print 'opened avdoc'
==================================

TRACEBACK:
==================================
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 486, in __bootstrap_inner
    self.run()
  File "D:\Ferdinand\#Storage\Ferdi-python\Acrobat Automation\temp
testing.py", line 89, in run
    AVD = win32com.client.Dispatch('AcroExch.AVDoc')
  File "C:\Python25\Lib\site-packages\win32com\client\__init__.py", line 95,
in Dispatch
    dispatch, userName =
dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
  File "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line 98,
in _GetGoodDispatchAndUserName
    return (_GetGoodDispatch(IDispatch, clsctx), userName)
  File "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line 78,
in _GetGoodDispatch
    IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
pythoncom.IID_IDispatch)
com_error: (-2147221008, 'CoInitialize has not been called.', None, None)
==================================

TIA. Best regards,
Ferdi
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From mal at egenix.com  Tue Feb 10 08:25:56 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Tue, 10 Feb 2009 14:25:56 +0100
Subject: Convert date/time to unix timestamp?
In-Reply-To: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
References: <b5c8da53-5ea5-4fc5-a788-49af08baf816@b16g2000yqb.googlegroups.com>
Message-ID: <49918064.4030201@egenix.com>

On 2009-02-10 10:26, Phillip B Oldham wrote:
> Is there a simple way to set a date/time and convert it to a unix
> timestamp? After some googling I found the following:
> 
> t = datetime.time(7,0,0)
> starttime = time.mktime(t.timetuple())+1e-6*t.microsecond
> 
> That seems like very long-winded. Is there an easier way? I've read
> the docs on the datetime and time modules, but nothing's jumping out
> at me.

>>> from mx.DateTime import DateTime
>>> DateTime(2009,10,2,7,0,0).ticks()
1254459600.0

http://www.egenix.com/products/python/mxBase/mxDateTime/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 10 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From tino at wildenhain.de  Tue Feb 10 08:30:11 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 10 Feb 2009 14:30:11 +0100
Subject: python ssh and Tetia SSH server
In-Reply-To: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>
References: <20381e4c-fe5d-49c8-9326-5b74e10e63f6@t11g2000yqg.googlegroups.com>
Message-ID: <49918163.7020002@wildenhain.de>

loial wrote:
> Anyone out there any experience of using python ssh modules to connect
> to the Tetia SSH server from SSH (ssh.com)?

Did you call their support? Personally I see no reason why
paramiko http://www.lag.net/paramiko/ should not work, given
that openssh ssh client also worked in the past with ssh.com
ssh.

Maybe you can get a test version and just try it out.

Regards
Tino
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From durumdara at gmail.com  Tue Feb 10 08:44:25 2009
From: durumdara at gmail.com (durumdara)
Date: Tue, 10 Feb 2009 14:44:25 +0100
Subject: Cheetah and hungarian charset...
In-Reply-To: <498B03F9.3040109@gmail.com>
References: <498B03F9.3040109@gmail.com>
Message-ID: <499184B9.7070903@gmail.com>

Hi!

Ok, I forget to set encodings.

from Cheetah.Template import Template
d = {'a' : 'alm?s'}
tp = Template("# encoding: iso-8859-2\nhello world ???? ${d['a']}!", 
searchList = {'d': d})
print tp

sys.exit()

This code is working for me in Windows.

dd

2009.02.05. 16:21 keltez?ssel, durumdara ?rta:
> Hi!
>
> I wanna ask that have anyone some exp. with Cheetah and the non-ascii 
> chars?
>
> I have a site. The html template documents are saved in ansi format, 
> psp liked them.
> But the cheetah parser makes ParseError on hungarian characters, like 
> "?", "?", "?", etc. When I remove them, I got good result, but I don't 
> want to remove them all...
>
> I cannot parse them. Please help me, how to force cheetah to eat them 
> all?
>
> Thanks for your help:
>     dd
>



From stephane at tinyerp.com  Tue Feb 10 09:05:45 2009
From: stephane at tinyerp.com (Stephane Wirtel)
Date: Tue, 10 Feb 2009 15:05:45 +0100
Subject: OpenERP 5.0 - Fully developed with Python
Message-ID: <499189B9.1050902@tinyerp.com>

OpenERP 5.0 is out !
====================

Why do I talk about OpenERP on this mailing list ? Because OpenERP is fully developed with Python

That major enhancement of Open ERP can now answer to all the needs of a business. Open ERP V5 not only provides management functions, but also all functionalities necessary to a SMB, like : a process 
management by modules, a wiki, a webmail, a Business Intelligence (Cube OLAP),  a Document Management System, an eCommerce, an idea box, etc.

Emphasis was placed on an extreme simplification of the software for the new users, a carefully designed ergonomy of the web client with, amongst others, drag&drop, Gantt graph, editable processes, 
etc., and more then 350 modules for specific sectors and big companies.

This new version comes with a full review of the web site giving access to more then 1500 pages of documentations on business management and a reorganization of the community sources build upon the 
Open Object framework. Free cycles of conferences are planned with the version 5.0 release of Open ERP.

Thanks to its huge community, Open Object produce more then 20 modules a month. The Open Object community it is more then 1000 contributors, 126 development branches in parallel, an average of 400 new 
functinalities or bugfix per month, one commit every 5 minutes and functional and technical  experts specialized by activity and working in teams.

The rise of Open Object and the diversity of the projects makes it an unmatched framework composed of more then 400 modules installable in a few clicks to cover all kinds of need or to simply start, 
with a simple module, to answer a simple need. Then, you can install other functionalities to come to a fully integrated and automaized system.

Open ERP v5 is characterized by the appearance of many functionalities far beyond the perimeter of traditional management.
One can underline the following innovations:

* A integrated wiki.
* An integrated document management system.
* A Business Intelligence (BI) using a OLAP database.
* An integrated BPM (management of process).
* A web portal for clients and suppliers.
* Improvement of translations (1 translation file by language and module).
* A touchscreen point of sale.
* A full Ajax webmail .
* A shared calendar. 	
* Plugins for Outlook, OpenOffice, ms. Office, Thunderbird.
* An integrated eCommerce, etc

This new release offers 3 user interfaces :
* the rich application client for a day to day advanced use,
* the web interface allowing a remote access and an easy deployment,
* the QT client that perfectly fits in a KDE environment.

Numerous improvements have been added to the client interfaces, like :
* dynamic graphs and dashboards,
* really ergonomic calendar views,
* dynamic Gantt graphs for planning,
* workflows editors,
* a fully integrated documentation,
* a dynamic process view used for the end-user training,
* etc.

The web version of Open ERP includes numerous functions to  modify or create your own application :
* an visual view editor,
* an object editor,
* a workflow (process) editor,
* an Open Office integrated report editor
* a statistics engine (BI cube),
* etc.

URL: http://www.openerp.com
URL: http://www.openobject.com
DOC: http://doc.openerp.com
Screencast: http://www.openerp.tv
LaunchPad Project: http://launchpad.net/openobject
-- 
Stephane Wirtel - "As OpenERP is OpenSource, please feel free to contribute."
Developper - Technical Instructor OpenERP
OpenERP - Tiny SPRL
Chaussee de Namur, 40
B-1367 Gerompont
Tel: +32.81.81.37.00
Web: http://www.tiny.be
Web: http://www.openerp.com
Planet: http://www.openerp.com/planet/
Blog: http://stephane-wirtel-at-tiny.blogspot.com
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From mail at timgolden.me.uk  Tue Feb 10 09:14:51 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 14:14:51 +0000
Subject: COM and threading, "CoInitialize"?
In-Reply-To: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>
References: <a9be2b70902100522w69fc2fabvf21b74fffe38cae8@mail.gmail.com>
Message-ID: <49918BDB.6020600@timgolden.me.uk>

Ferdinand Sousa wrote:
> Greetings to list members,
> 
> I am trying to use an Acrobat COM object in a class that is subclassed from
> threading.Thread.
> Since threading.Thread is subclassed, the __init__ method of the inheriting
> class must explicitly call the threading.Thread.__init__ method of the
> parent. I guess I'm missing something similar for the COM object. Threading
> code and traceback below. Any pointers?

[... snip lots of code and traceback ...]

> com_error: (-2147221008, 'CoInitialize has not been called.', None, None)
> ==================================

Well, much as I may grumble about opaque error messages, you're not going
to find one much more explicit than this. Try calling CoInitialize,
once per thread, eg before your Dispatch line. You'll have to import
pythoncom and then just call pythoncom.CoInitialize ()

TJG


From jldunn2000 at googlemail.com  Tue Feb 10 09:21:46 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 06:21:46 -0800 (PST)
Subject: Using paramiko rsa key
Message-ID: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>

I want to connect via ssh from a python script on windows to an AIX
server running openSSH using rsa keys rather than a password.

Can anyone provide me with /point me at  a simple tutuorial on the
steps I need to go though in terms of geneerating the key, installing
on the server and connecting in my python code?

Thanks in advance.





From philip at semanchuk.com  Tue Feb 10 10:06:50 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:06:50 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
Message-ID: <2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>


On Feb 9, 2009, at 10:26 PM, kpp9c wrote:

> okay... for the life of me i do not see any Python Launcher.app and i
> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
> installed the dev kit.
>
> Where the heck is this application?

Hi kp,
I don't seem to have any such beast on my system except for the one  
in /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?




From tino at wildenhain.de  Tue Feb 10 10:11:12 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 10 Feb 2009 16:11:12 +0100
Subject: Using paramiko rsa key
In-Reply-To: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
Message-ID: <49919910.50303@wildenhain.de>

loial wrote:
> I want to connect via ssh from a python script on windows to an AIX
> server running openSSH using rsa keys rather than a password.
> 
> Can anyone provide me with /point me at  a simple tutuorial on the
> steps I need to go though in terms of geneerating the key, installing
> on the server and connecting in my python code?

Sure, where can we send the invoice too?

Regards
Tino
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From philip at semanchuk.com  Tue Feb 10 10:11:32 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:11:32 -0500
Subject: STMP, mail, sender-from, to-bcc-addr
In-Reply-To: <4991733E.4040608@gmail.com>
References: <4991733E.4040608@gmail.com>
Message-ID: <34E7920F-9155-4846-BC0F-8BFDEA3931B9@semanchuk.com>


On Feb 10, 2009, at 7:29 AM, durumdara wrote:

> Hi!
>
> I wanna ask that have anyone some experience with email.msg and  
> smtplib?
>
> The email message and smtp.send already have "sender/from" and  
> "recip/addr to".
> Possible the smtp components does not uses the email tags if I not  
> define them only in the message?
>
> Can I do same thing as in GMAIL that the mail does not have TO, only  
> BCC tags/recipients, and no one of the recipients who knows about  
> the each others?

Hi dd,
I'm not exactly sure what you're asking, but my memories of  
implementing BCC are that there is no BCC tag. It's your job as the  
programmer building the application that sends the message to send the  
mail to everyone on the BCC list. Something like this:

for recipient in bcc:
    send_mail(to=recipient)

Hope this helps
Philip


From philip at semanchuk.com  Tue Feb 10 10:29:15 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 10:29:15 -0500
Subject: Calling into Python from a C thread
In-Reply-To: <gmq5fk$rdh$1@ger.gmane.org>
References: <mailman.8619.1233597806.3487.python-list@python.org>	<20090209170259.1D4C78FDE0@panix3.panix.com>	<BE98D80D-5A8C-4A9C-BACE-9ED1C1F166B3@semanchuk.com>	<gmq0hi$8gv$1@ger.gmane.org>
	<BF39CA37-3384-4ED7-AAC5-F7107A323958@semanchuk.com>
	<gmq5fk$rdh$1@ger.gmane.org>
Message-ID: <57C5AC52-6B7B-4B35-87FD-C1E065AD850E@semanchuk.com>


On Feb 9, 2009, at 3:59 PM, Christian Heimes wrote:

> Philip Semanchuk wrote:
>> Yes, that's accurate except for the word "forgot". To forget  
>> something
>> one must first know it. =) I found the threading API documentation
>> difficult to follow, but I suppose that what I'm doing is a little
>> unusual so if it is not well-documented territory, that's what I  
>> get for
>> wandering off the map.
>
> I see. Apparently the threading and embedding docs don't cover your
> case. The docs at
> http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock
> and http://docs.python.org/extending/embedding.html should explain how
> and when to initialize Python threads. Please report a documentation  
> bug at
> http://bugs.python.org/.

I read that several times and eventually got my code working. I  
wouldn't say that the documentation didn't cover my case (implementing  
a callback). I'd say that it doesn't cover *any* cases in particular.  
It's more like a list of tools for manipulating the GIL and thread  
state and an explanation of the need for them rather than a tutorial  
on how to use them. The latter is what I needed, but as I said, what  
I'm doing is atypical and I think it is reasonable to expect thin  
documentation on atypical situations.

> PS: I know a great way to learn more about Python's internal threading
> CAPI: fix your code, test it and attach a doc patch to your bug  
> report.
> *hint* :)

I will file a bug on a least one specific point which is that  
PyGILState_Ensure() acquires the GIL and PyGILState_Release() appears  
to release it; the latter point is undocumented.

Cheers
Philip


From rodmena.com at gmail.com  Tue Feb 10 10:38:37 2009
From: rodmena.com at gmail.com (Farsheed Ashouri)
Date: Tue, 10 Feb 2009 07:38:37 -0800 (PST)
Subject: Uploading big files wit cherrypy
Message-ID: <366595b2-226c-48e4-961d-85bd0ce4bd9a@h16g2000yqj.googlegroups.com>

I use this code to upload using cherrypy:
#========Code Start==========
class NoteServer(object):
    _cp_config = { 'tools.sessions.on': True }

    def index(self):
        return """
        <html><body>
            <form action="upload" method="post" enctype="multipart/
form-data">
            filename: <input type="file" name="myFile" /><br />
            <input type="submit" />
            </form>
            <p>
            Pars Studios, 2009
            </p>
        </body></html>
        """
        #~ return compose().run()
    index.exposed = True
    def upload(self, myFile):
        out = """<html>
        <body>
            myFile length: %s<br />
            myFile filename: %s<br />
            myFile mime-type: %s
        </body>
        </html>"""

        # Although this just counts the file length, it demonstrates
        # how to read large files in chunks instead of all at once.
        # CherryPy uses Python's cgi module to read the uploaded file
        # into a temporary file; myFile.file.read reads from that.
        size = 0
        allData=''
        while True:
            data = myFile.file.read(8192)
            allData+=data
            if not data:
                break
            size += len(data)
        savedFile=open(myFile.filename, 'wb')
        savedFile.write(allData)
        savedFile.close()
        return out % (size, myFile.filename, myFile.type)
        #~ return allData
    upload.exposed = True
#========Code End============

But I couldn't upload files bigger than 100Mb.
Why and what is workaround?

Thanks in advanced.


From rschroev_nospam_ml at fastmail.fm  Tue Feb 10 10:39:56 2009
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Tue, 10 Feb 2009 16:39:56 +0100
Subject: STMP, mail, sender-from, to-bcc-addr
In-Reply-To: <mailman.9228.1234272830.3487.python-list@python.org>
References: <mailman.9228.1234272830.3487.python-list@python.org>
Message-ID: <hdhkl.11634$9u6.6137@newsfe27.ams2>

durumdara schreef:
> Hi!
> 
> I wanna ask that have anyone some experience with email.msg and smtplib?
> 
> The email message and smtp.send already have "sender/from" and 
> "recip/addr to".
> Possible the smtp components does not uses the email tags if I not 
> define them only in the message?

smtplib.SMTP.sendmail() does not look in the message to find the sender
or recipients; it only uses the parameters you pass.

> Can I do same thing as in GMAIL that the mail does not have TO, only BCC 
> tags/recipients, and no one of the recipients who knows about the each 
> others?

Include the BCC-recipients in the call to sendmail(), but don't put them
in the email message itself. Include TO-recipients in both. In other
words, what you put in the TO-header is what all recipients will see;
what you pass to sendmail() is what recipients the mail will be send to.
Simple example (not tested):

from_addr = 'foo at example.com'
to_addr = ['bar at example.com', 'xyzzy at example.com']
bcc_addr = ['spam at example.com', 'eggs at example.com']

msg = """From: %s
To: %s
Subject: test

hello
""" % (from_addr, ', '.join(to_addr))

smtp = smtplib.SMTP(...)
smtp.sendmail(from_addr, to_addr + bcc_addr, msg)


-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From bj_666 at gmx.net  Tue Feb 10 10:47:57 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 10 Feb 2009 15:47:57 GMT
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
	<34d373ad-52d2-4d38-94b7-d566a5a5dd58@s20g2000yqh.googlegroups.com>
Message-ID: <6vdltdFjele5U2@mid.uni-berlin.de>

On Tue, 10 Feb 2009 02:11:10 -0800, Michele Simionato wrote:

> Unfortunately there is no good solution. If you have a single
> inheritance hierarchy and you do not use super, you make it impossible
> for users of your hierarchy to subclass it by using multiple
> inheritance in a cooperative way (this is not polite).

So I'm impolite.  :-)  I'm using multiple inheritance only for mixin 
classes and even that quite seldom.  No `super()` in my code.

Ciao,
	Marc 'BlackJack' Rintsch


From jldunn2000 at googlemail.com  Tue Feb 10 10:48:46 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 07:48:46 -0800 (PST)
Subject: Using paramiko rsa key
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
Message-ID: <41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>

Can anyone be a little more helpful than Tino?

I have generated the key file as follows on windows and ftp'd the
id_rsa.pub file to the .ssh directory on the server and renamed to
authorized_keys


import paramiko


key = paramiko.RSAKey.generate(2048)

key.write_private_key_file('Z:/id_rsa')
file = open('Z:/id_rsa.pub','w')
file.write("ssh-rsa " +key.get_base64())
file.close()

But when I try to connect as follows I get an authentication failed
error.


import paramiko

paramiko.util.log_to_file('demo_sftp.log')

try:
    try:
        key = paramiko.RSAKey.from_private_key_file("Z:/id_rsa") #the
generated private key
    except Exception, e:
        print str(e)
    t = paramiko.Transport(('10.5.1.15', 22))
    print "here"
    t.start_client()
    t.auth_publickey('prod2',key)

    if t.is_authenticated():
        print "Got it!"
    sftp = paramiko.SFTPClient.from_transport(t)
    dirlist = sftp.listdir('.')
    print "Dirlist:", dirlist
    t.close()
except Exception, e:
    print str(e)
    t.close()





From martin at marcher.name  Tue Feb 10 10:58:40 2009
From: martin at marcher.name (Martin)
Date: Tue, 10 Feb 2009 16:58:40 +0100
Subject: how to find out vesion of a python module
In-Reply-To: <90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>
References: <083dcd2f-c225-471c-8c78-c6570a08d659@v38g2000yqb.googlegroups.com>
	<mailman.9188.1234228035.3487.python-list@python.org>
	<90ab16f0-bc7f-4489-afbf-6bcfae3061f3@j8g2000yql.googlegroups.com>
Message-ID: <5fa6c12e0902100758t510b6c89q379f87f3ca59f6e5@mail.gmail.com>

Hi,

2009/2/10 Atishay <contactatishay at gmail.com>:
> Now the point is, how do I avoid setting LD_LIBRARY_PATH everytime for
> python? I know I can write a bash script, but I am sure python would
> have some feature that I can tweak to make it work.

On debian you can modify

 * /etc/ld.so.conf and/or
 * /etc/ld.so.conf.d/....

to include the path you need.

hth
martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From bob.uuca at gmail.com  Tue Feb 10 11:07:30 2009
From: bob.uuca at gmail.com (Mac)
Date: Tue, 10 Feb 2009 08:07:30 -0800 (PST)
Subject: Change in cgi handling of POST requests
Message-ID: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>

We just upgraded Python to 2.6 on some of our servers and a number of
our CGI scripts broke because the cgi module has changed the way it
handles POST requests.  When the 'action' attribute was not present in
the form element on an HTML page the module behaved as if the value of
the attribute was the URL which brought the user to the page with the
form, but without the query (?x=y...) part.  Now FieldStorage.getvalue
() is giving the script a list of two copies of the value for some of
the parameters (folding in the parameters from the previous request)
instead of the single string it used to return for each.  I searched
this newsgroup looking for a discussion of the proposal to impose this
change of behavior, and perhaps I wasn't using the right phrases in my
search, but I didn't find anything.  I see that Perl still behaves the
way pre-2.6 Python used to (not that I view that as a reason for
anything).  We'll work around the breakage by explicitly setting the
'action' attribute everywhere, of course, but I usually see some
discussion (often heated) of the impact of behavior changes on
existing software when something like this is in the works.  Did I
miss it?

I also noted that the module is making some deprecated use of the
BaseException class.

Cheers.


From rdmurray at bitdance.com  Tue Feb 10 11:13:47 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 16:13:47 +0000 (UTC)
Subject: Import without executing module
References: <d9ffd75c-4045-4765-9089-e3554a04a390@r15g2000prd.googlegroups.com>
	<7a9c25c20902012319i2d217644k12bc926400f630c2@mail.gmail.com>
	<mailman.8599.1233579075.3487.python-list@python.org>
	<14edd870-74d4-4d7a-a363-a4bc3515a071@s9g2000prg.googlegroups.com>
	<0ad1a5c0-0605-49fe-8a97-1159fc274d30@a39g2000prl.googlegroups.com>
	<45e5daf1-108c-499e-82a9-10e67eac33e2@z27g2000prd.googlegroups.com>
	<5a64441e-bee9-4466-b613-3e83fce2e8fb@r15g2000prd.googlegroups.com>
	<7a9c25c20902032008u1e745eb0x2d30b45844a74c5d@mail.gmail.com>
	<gmrtvd$eb4$2@ger.gmane.org>
Message-ID: <gms93r$2gq$1@ger.gmane.org>

Lie Ryan <lie.1296 at gmail.com> wrote:
> On Tue, 03 Feb 2009 20:08:34 -0800, Stephen Hansen wrote:
> 
> > There is no need to try to make sure something is
> > executed/compiled only once in Python like you may want to do in C.
> > Every module is only ever compiled once: if you import it ten times in
> > ten different places only the first will compile and execute the code,
> > the rest of the calls will return that original module again.
> 
> <nitpick>
> If you import a module, it will be recompiled only if the module changes 
> from the precompiled .pyc/.pyo. OTOH, if you run a module, it will be 
> recompiled every time even if there is no change.
> </nitpick>

As long as we are nitpicking, and trying to clarify things for a new
Python user....let me give it a try.  By doing this I get to find out
if I really understand it as well as I think I do :)

If a file is run as a script ('python somefile.py', or shebang magic on
unix or the equivalent on other OSes), then the code is compiled/executed
each time that is done.  If a module is imported (or something is imported
from a module), then the _first time_ during a given run of the python
interpreter that such an import is done, the timestamp of the .py file
(if it exists) is compared to the timestamp of the .pyc/.pyo file, and
if the .py is newer, the .py file is compiled to byte code, the resulting
byte code is written to the .pyc (or .pyo), and the byte code is executed.
If the .py file is older, then the saved byte code is loaded and executed.
It is the execution of the byte code that creates the module's namespace
(a collection of names pointing to objects).  This namespace is registered
in sys.modules under the module's name.  During the remainder of that
run of the python interpreter, any import statement that draws from
that module simply loads a pointer to the module's namespace (or to
objects referenced by the module's namespace if it is a 'import from')
into the local namespace.

--RDM



From jasiu85 at gmail.com  Tue Feb 10 11:23:45 2009
From: jasiu85 at gmail.com (Jasiu)
Date: Tue, 10 Feb 2009 08:23:45 -0800 (PST)
Subject: version in setup.cfg
References: <0b778f9a-d811-4dcd-9678-26242a14c4bf@t11g2000yqg.googlegroups.com>
	<6vbg8kFj8k12U1@mid.uni-berlin.de>
Message-ID: <ab5faadc-1c47-47a0-885a-764301fe9ec1@v39g2000yqm.googlegroups.com>

> I don't think so. But there are several other options:

I was afraid of that.

Thanks anyway!

Mike


From jef.mangelschots at gmail.com  Tue Feb 10 11:26:42 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Tue, 10 Feb 2009 08:26:42 -0800 (PST)
Subject: import wx works interactive but not from script
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
	<mailman.9215.1234257018.3487.python-list@python.org>
Message-ID: <35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>

I ran the script from a command line, so it is not a file association
thing.
I do have multiple versions of Python installed on that machine. I
will uninstall them all and install a single version from clean.
Thanks for the suggestion


From mail at timgolden.me.uk  Tue Feb 10 11:39:29 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 10 Feb 2009 16:39:29 +0000
Subject: import wx works interactive but not from script
In-Reply-To: <35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>	<mailman.9215.1234257018.3487.python-list@python.org>
	<35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
Message-ID: <4991ADC1.3040200@timgolden.me.uk>

jefm wrote:
> I ran the script from a command line, so it is not a file association
> thing.

Ummm... if you ran it by just typing the script name --
c:\test\whatever.py rather than c:\pythonxx\python c:\test\whatever.py --
then it certainly could be a file association issue.

> I do have multiple versions of Python installed on that machine. I
> will uninstall them all and install a single version from clean.
> Thanks for the suggestion

Hope it helps. Let us know how it turns out.

TJG


From olivierbourdon38 at gmail.com  Tue Feb 10 11:42:04 2009
From: olivierbourdon38 at gmail.com (olivierbourdon38 at gmail.com)
Date: Tue, 10 Feb 2009 08:42:04 -0800 (PST)
Subject: Tricky question about native extension packaging
Message-ID: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>

let's assume I (almost) have and extension available as a C file and
the setup.py and I want to generate from this single c file 2 .so
files using

cc -DOPTION1 x.c to produce x_1.so
cc -DOPTION2 x.c to produce x_2.so

and at runtime depending of my OS version either load x_1 or x_2

any (easy) way to do that and deliver the result as a single .egg
file ? What should the setup.py look like ?

Thanks for any insight



From quian.xu at stud.tu-ilmenau.de  Tue Feb 10 11:48:39 2009
From: quian.xu at stud.tu-ilmenau.de (Qian Xu)
Date: Tue, 10 Feb 2009 17:48:39 +0100
Subject: UnitTest break on failure
Message-ID: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>

Hi All,

i am writing unit tests and have got a problem:
I want to test some code sequence like:

 self.assertEquals(testMethod1(), expected_value1);
 self.assertEquals(testMethod2(), expected_value2);

However, if the first test item is failed, no more tests will be executed.
Can I tell Python, 
1. go ahead, if a failure is occurred. 
2. stop, if an error is occurred?


Best regards,
Qian Xu


From benjamin.kaplan at case.edu  Tue Feb 10 11:49:59 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 10 Feb 2009 11:49:59 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
Message-ID: <ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>

On Tue, Feb 10, 2009 at 10:06 AM, Philip Semanchuk <philip at semanchuk.com>wrote:

>
> On Feb 9, 2009, at 10:26 PM, kpp9c wrote:
>
>  okay... for the life of me i do not see any Python Launcher.app and i
>> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
>> installed the dev kit.
>>
>> Where the heck is this application?
>>
>
> Hi kp,
> I don't seem to have any such beast on my system except for the one in
> /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?



It should be in there. It's in the Python framework folder instead of the
normal applications folder, and spotlight doesn't find it. Try checking
/System/Library/Frameworks/Python.framework/versions/2.5/Resources.


>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From philip at semanchuk.com  Tue Feb 10 12:03:02 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 10 Feb 2009 12:03:02 -0500
Subject: Python Launcher.app on OS X
In-Reply-To: <ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
	<ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com>
Message-ID: <3EDA106D-B8EA-4AD9-8F92-EC222973D159@semanchuk.com>


On Feb 10, 2009, at 11:49 AM, Benjamin Kaplan wrote:

> On Tue, Feb 10, 2009 at 10:06 AM, Philip Semanchuk <philip at semanchuk.com 
> >wrote:
>
>>
>> On Feb 9, 2009, at 10:26 PM, kpp9c wrote:
>>
>> okay... for the life of me i do not see any Python Launcher.app and i
>>> just installed OS X 10.5 (running 10.5.6 on intel) .... and i also
>>> installed the dev kit.
>>>
>>> Where the heck is this application?
>>>
>>
>> Hi kp,
>> I don't seem to have any such beast on my system except for the one  
>> in
>> /Applications/MacPython 2.5/. Perhaps the documentation is mistaken?
>
>
>
> It should be in there. It's in the Python framework folder instead  
> of the
> normal applications folder, and spotlight doesn't find it. Try  
> checking
> /System/Library/Frameworks/Python.framework/versions/2.5/Resources.

Good call, you are 100% correct, with the footnote that Versions in  
that path should be capitalized.

/System/Library/Frameworks/Python.framework/Versions/2.5/Resources





From martin.hellwig at dcuktec.org  Tue Feb 10 12:08:38 2009
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 10 Feb 2009 17:08:38 +0000
Subject: Using paramiko rsa key
In-Reply-To: <41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
	<41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
Message-ID: <4991b496$0$188$e4fe514c@news.xs4all.nl>

loial wrote:
> Can anyone be a little more helpful than Tino?
<cut>
I'll do some freebie hints :-)
What I would do is try first whether key authentication works at all, 
for example following a tutorial like 
http://the.earth.li/~sgtatham/putty/0.53b/htmldoc/Chapter8.html

And if that works translate it to the relevant python code.

-- 
mph


From aahz at pythoncraft.com  Tue Feb 10 12:14:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 09:14:21 -0800
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
	<mailman.8714.1233686338.3487.python-list@python.org>
Message-ID: <gmscld$sht$1@panix3.panix.com>

In article <mailman.8714.1233686338.3487.python-list at python.org>,
 <rdmurray at bitdance.com> wrote:
>Quoth aahz at pythoncraft.com (Aahz):
>> In article <MPG.23f220f22aa48ce99897ba at news.individual.de>,
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>>* Aahz (2 Feb 2009 09:29:43 -0800)
>>>> 
>>>> Polarized sunglasses don't work too well with LCD monitors
>>>
>>>Well, the answer to your issue with syntax highlighting is to use a 
>>>/decent/ highlighting colour scheme. Don't use that all 
>>>purple/red/green/yellow/blue one. That's for psychedelic trips.
>>>
>>>Use a decent colour scheme for adults and you will see that you will 
>>>benefit from syntax highlighting.
>> 
>> Then I have the problem of copying around the syntax highlighting
>> configuration to every computer I use.
>
>Well, _that's_ easy to fix.  I have a little bash script called
>'synchome' that uses rsync to update the home directory on any of the
>remote machines on which I work.  I've had to install rsync on one or
>two of the boxes, but that's a useful thing to do anyway.
>
>(Granted, I still have a couple bugs to work out, where I haven't taken
>the time to conditionalize things properly for some of the more exotic
>machine configurations, but hey, if I spend more time on those machines
>I'll get around to it...)

The need to conditionalize for different environments is the main reason
I haven't bothered, combined with the need to spend time working out a
decent color scheme I'm happy with.  I've been working this way (plain
vi) for more than twenty years and I don't see much point fixing what
ain't b0rken.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From aquil.abdullah at gmail.com  Tue Feb 10 12:50:27 2009
From: aquil.abdullah at gmail.com (aha)
Date: Tue, 10 Feb 2009 09:50:27 -0800 (PST)
Subject: Logging in Python
Message-ID: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>

Hello All,

I have an application where logging may need to be configured in
multiple places.  I've used the Python Logging Framework for sometime,
but I'm still not sure how to test if logging has configured.  For
example, I have modules A, B, and C.

Below is some pseudo code...
moduleA

class A(object):
  def __init__(self):
    ...

startLogging(config):
  # Configure logging
  # global logger
  ...

moduleB
import moduleA
from myconfig import MyConfig
class B(object):
  def __init__(self):
    # self.config = MyConfig()
    # if logging has started [HOW DO YOU DO THIS?]
    #   self.logger = logging.getLogger("moduleB")
    # else
    #   self.logger = moduleA.startLogging(self.config)
    # moduleA.startLogging
    ...

Where I need help is determining if a logger has already been
configured.  Any advice?

Aquil


From cosmo_general at yahoo.com  Tue Feb 10 12:55:32 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Tue, 10 Feb 2009 09:55:32 -0800 (PST)
Subject: Can urllib check path exists on server?
Message-ID: <7abd3c00-e77e-47b8-8b2d-436bc6919760@h16g2000yqj.googlegroups.com>

Hi Folks,

urllib bridges up a client to a server, it works fine. I wonder: is
there a method that can check the existence of a file in the server
side? We can check such an existence on local filesystem by using
os.path.exists(), can I do such a check on server? For example,
http://somedomain.com/foo/bar.jpg is residing in a hosting server, can
I use urllib to check if bar.jpg file existing or not? Thanks!

Muddy Coder


From mcfletch at vrplumber.com  Tue Feb 10 13:07:50 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 10 Feb 2009 13:07:50 -0500
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <4991C276.5020602@vrplumber.com>

rantingrick wrote:
...
> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps. I now believe i am
> ready to start this endeavor and i am currently looking for fellow
> Python programmers (no matter what skill level) to get started
> brainstorming this design.
>   
I'm certainly willing to help with brainstorming...
> Of course Python will limit the speed here, but at this point i want
> to get a template up and running. Speed does not matter at this point,
> and optimizations can come along later as i am sure a few complete re-
> writes are inevitable :)
>   
Simple CAD systems without shading/texturing shouldn't have any real 
performance issues under Python.  We had 3D CAD back in 1993 sufficient 
to build reasonably complex environments when I was in architecture.  
Python's only about 10x slower than C, and if you dump large C-level 
arrays into the graphics card your performance can be quite reasonable.  
If you have a visit @ every face/line for every refresh you'll spend all 
your time in the scenegraph traversal.
> There will need to be mouse picking as i see this application as a
> very interactive environment. Of course in the beginning all
> interaction will most likely be in a command line type manner until
> the functionality can be worked out.
>   
Mouse picking is pretty easy, you can either use simple ray-intersection 
on your bounding-box hierarchy (easiest/fastest for CAD-type structures) 
or render-pass based stuff (if you have lots of organic shapes that will 
show through each other a lot and you want to be able to click on the 
thing "peeking through" behind another thing.  Both are very well 
documented and easy/fast to implement if/when your scenegraph is 
tracking bounding volumes.
> There will need to be a hierarchy of instancing and grouping within
> the model to facilitate easy transformation of entities within the
> model.
>   
Transform and Group nodes are definitely a good idea, as are "USE" nodes.
> I am not too worried about any sort of texturing at this point. I want
> to squeeze as much speed as possible and prettiness will come in due
> course. I also have no plans for layering, or multiple scenes at this
> time. Simple functionality is the end game here.
>   
Fair enough.
> #-- Entities --#
>  face
>  line-segment
>   
That's pretty low-level.  You may want to work with "meshes" or the 
like, so that you select the mesh, then modify the faces/vertices/edges 
(a-la 3DSMax/Maya), particularly where you want faces to share 
coordinates.  Just a thought.
> #-- Hierarchy --#
>  Entity (one face, or line-segment)
>   
Again, seems like you'd want something a little less soup-of-lines-ish, 
but then that's a 3D Modeler bias, rather than a CAD bias (where often 
it really is just a soup of lines).
>  Group (contained of multiple entities that can be translated,
> rotated, scaled as one)
>   
Transform node.
>  Instance (component definition)
>   
Node with DEF + USE's node instance.  Or, if you mean a reusable, 
parameterized node, a PROTO definition and PROTO-using nodes.
> #-- Tools --#
>  line
>  rect
>  circle
>  arc
>   
You'll want mechanisms to define the current coordinate system as well 
(think AutoCAD "UCS") so that you can precisely align the work you are 
doing without needing to calculate cos/sin/tan for everything.  That is, 
your rotation/translation/scale should allow you to draw *within* the 
resulting Transform.  You'll likely also want to be able to translate 
objects to/from Transform spaces (i.e. reparent without moving).

Also (from my many-year-old recollection of doing CAD in architecture):

    * tan (when you want to draw lines tangential to a circle/arc and
      then trim)
    * chamfer/fillet (easy to code and pretty darn useful for a lot of
      detail drawings)
    * copy
    * align
    * delete/erase
    * hide/show hidden edges
    * mirror/mirror3d (used it all the time)
    * text (pretty important for CAD work)
    * snap control (critically important IMO)
    * polyline/polygon (or tools to combine lines/arcs into polygons and
      close the result for e.g. extrusion)
    * splines/nurbs or other high-order surfaces (eventually)
    * boolean operators (eventually, use a library for this unless you
      really want to learn, and even then, do it yourself and then use a
      library)

>  select
>   
Critical to get that right to make it usable.
>  rotation
>  translation
>  scale
>   
I'd suggest a Maya-like control for this as far as the GUI goes, put 
snaps on it, but make a single widget that lets you 
rotate/translate/scale.  You'll also want such things as 
scale-this-line-to-be-this-size rescales (scale, pick two points, pick 
two other points, scale is the relative length of the two points)...
>  extrusion along path
>   
Available in GLE extensions (nodes available too).  Also want "revolve" 
(extrude around a path, which may be a point).  Depending on your model, 
you may want to allow for converting extrusions to faces in order to 
allow tweaking the resulting extrusion.  You'll want/need a UI to "open" 
the extrusion and change the backbone and sweep shapes.
>  measurement
>   
measurement == dimensioning (dim*)?  Or just on-screen measurement 
(dist).  Both are useful.
> So there it is. Any takers? :)
>   
I can't even begin to commit any real time to another project (I barely 
have time to work on the ones I already have), but if you need feedback, 
feel free to email me.  Most of the graphics stuff sounds like stuff you 
could build on top of OpenGLContext or COIN or any of the generic 
scenegraph libraries.  They aren't really CAD-focused, but they've 
already got the ability to draw the things you're wanting to work on, 
and have the Transforms and similar support to make the coding a 
reasonable task.  However, they're closer to a Maya/3DSMax model than 
AutoCAD, so maybe you'll decide you want to go your own way.

You may want to check out PythonCAD as well, which IIRC does 2D-only CAD.

Anyway, hope this was some help.  Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From rdmurray at bitdance.com  Tue Feb 10 13:08:25 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 18:08:25 +0000 (UTC)
Subject: Can urllib check path exists on server?
References: <7abd3c00-e77e-47b8-8b2d-436bc6919760@h16g2000yqj.googlegroups.com>
Message-ID: <gmsfqp$t08$1@ger.gmane.org>

Muddy Coder <cosmo_general at yahoo.com> wrote:
> urllib bridges up a client to a server, it works fine. I wonder: is
> there a method that can check the existence of a file in the server
> side? We can check such an existence on local filesystem by using
> os.path.exists(), can I do such a check on server? For example,
> http://somedomain.com/foo/bar.jpg is residing in a hosting server, can
> I use urllib to check if bar.jpg file existing or not? Thanks!

urllib implements the http protocol for http URLs, so you can only do
what the http protocol allows.  Thus if http://somedomain.com/foo/bar.jpg
is a valid URL on that server, you can do a urlopen, and then check
the 'getcode' method on the returned object to see if you got a '404'
(not found) code back.

--RDM



From rdmurray at bitdance.com  Tue Feb 10 13:20:02 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 10 Feb 2009 18:20:02 +0000 (UTC)
Subject: what IDE is the best to write python?
References: <0adc6dcd-0c3e-4241-a25e-e3fe28b8e541@z28g2000prd.googlegroups.com>
	<MPG.23f220f22aa48ce99897ba@news.individual.de>
	<gm9taq$63d$1@panix3.panix.com>
	<mailman.8714.1233686338.3487.python-list@python.org>
	<gmscld$sht$1@panix3.panix.com>
Message-ID: <gmsggh$uot$1@ger.gmane.org>

aahz at pythoncraft.com (Aahz) wrote:
> In article <mailman.8714.1233686338.3487.python-list at python.org>,
>  <rdmurray at bitdance.com> wrote:
> >Quoth aahz at pythoncraft.com (Aahz):
> >> Then I have the problem of copying around the syntax highlighting
> >> configuration to every computer I use.
> >
> >Well, _that's_ easy to fix.  I have a little bash script called
> >'synchome' that uses rsync to update the home directory on any of the
> >remote machines on which I work.  I've had to install rsync on one or
> >two of the boxes, but that's a useful thing to do anyway.
> >
> >(Granted, I still have a couple bugs to work out, where I haven't taken
> >the time to conditionalize things properly for some of the more exotic
> >machine configurations, but hey, if I spend more time on those machines
> >I'll get around to it...)
> 
> The need to conditionalize for different environments is the main reason
> I haven't bothered, combined with the need to spend time working out a
> decent color scheme I'm happy with.  I've been working this way (plain
> vi) for more than twenty years and I don't see much point fixing what
> ain't b0rken.

I did the conditionalization bit by bit, and there isn't much of it
since I can install my "standard environment" (zsh, screen, vim) on
almost all the boxes on which I work.

I was as you are on colorization until about three months ago.  Then I
figured out how to get 256 colors in my xterms and found 'desert.vim',
which works for me (nice gentle colors).  Now I'm a happy user of
colorization, and have even written a colorizor for a file whose syntax
I defined, that helps me avoid making stupid typos in said file, that
I used to make far too often.  In other words, the benefits tipped over
into outweighing the costs for me just recently...

--RDM



From pythonsky at sky.com  Tue Feb 10 13:22:36 2009
From: pythonsky at sky.com (Gary Wood)
Date: Tue, 10 Feb 2009 18:22:36 -0000
Subject: python3 tutorial for newbie
Message-ID: <920577A6E319438A9397A41B74AE9913@Woodygar>

Can someone recommend a good tutorial for Python 3, ideally that has tasks or assignments at the end of each chapter. 
Please,
-------------- next part --------------
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From castironpi at gmail.com  Tue Feb 10 13:39:59 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 10 Feb 2009 10:39:59 -0800 (PST)
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<mailman.9202.1234243720.3487.python-list@python.org>
	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au> 
	<mailman.9219.1234269022.3487.python-list@python.org>
Message-ID: <dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>

On Feb 10, 6:30?am, "andrew cooke" <and... at acooke.org> wrote:
> steven probably knows this, but to flag the issue for people who are
> looking at generators/coroutines for the first time: there's a little
> "gotcha" about exactly how the two sides of the conversation are
> synchronized. ?in simple terms: send also receives.
>
> unfortunately the example steven gave doesn't really show this, so i've
> modified it below. ?you can now see that the first next() after .send()
> receives 2, not 1. ?note that i am using python 3, so the .next() method
> is .__next__() (the asymmetry between next and send seems odd to me, but
> there you go).
>
> (in a sense this is completely logical, but if you're used to the
> asynchronous way the internet works, it can seem unintuitive)
>
> how to handle this was one of the things the original post was asking
> about (if i understood correctly).
>
> >>> def gen(n):
>
> ... ? while True:
> ... ? ? obj = yield n
> ... ? ? n += 1
> ... ? ? if obj is not None: n = obj
> ...>>> g = gen(5)
> >>> next(g)
> 5
> >>> g.__next__()
> 6
> >>> g.send(1)
> 1
> >>> next(g)
>
> 2
>
> andrew
>
> Steven D'Aprano wrote:
> > On Tue, 10 Feb 2009 05:28:26 +0000, John O'Hagan wrote:
> >> I would love to see a simple code example of this if you have one; I've
> >> been wanting to do this but couldn't even get started.
>
> > Is this too simple?
>
> >>>> def gen(n):
> > ... ? ? while True:
> > ... ? ? ? ? ? ? obj = yield n
> > ... ? ? ? ? ? ? if obj is not None: n = obj
> > ...
> >>>> g = gen(5)
> >>>> g.next()
> > 5
> >>>> g.next()
> > 5
> >>>> g.send(12)
> > 12
> >>>> g.next()
> > 12
>
>

I guess a generator that counts, but skips K numbers, where K can be
varied.  For instance, you initialize it with N, the starting number,
and K, the jump size.  Then, you can change either one later on.
(Unproduced.)

>>> j= jumper( N= 1, K= 1 )
>>> next( j )
1
>>> next( j )
2
>>> j.send( K= 3 )
5
>>> next( j )
8

However, if in the caller, the 'send' and 'next' come from two
different places, then your 'send' "eats" one of your 'next's, and the
'next' code just receives 1..2..8.

The above code isn't legal (or practical), due to the 'K=3' in send.
You could do 'j.send( dict( K= 3 ) )', but you can't do 'locals
().update( result )' in your generator, unfortunately.  So you have a
big switch statement there.

One solution: You could always query a dictionary for your variables,
and do 'my_locals.update( result )', and 'my_locals[ "K" ]' for a
variable.  Then you just need some sort of collector generator to go
around the first one, and duplicate the value 'send' returns, before
going back to 'next'.  (Unproduced.)

>>> j= repeat_on_send( jumper( N= 1, K= 1 ) )
>>> next( j )
1
>>> next( j )
2
>>> j.send( dict( K= 3 ) )
5
>>> next( j )
5
>>> next( j )
8

Two solution (er, solution two), would be to give a generator object
access.  Unfortunately, generators have no 'gi_dict' attribute, so
arbitrary attributes aren't possible.  So you have to be clever.
(Unproduced.)

>>> @gen_dict
>>> def jumper...
...
>>> j= jumper( N= 1, K= 1 )
>>> next( j )
1
>>> next( j )
2
>>> j.K= 3
>>> next( j )
5
>>> next( j )
8

This gets two birds with one stone, but is it possible?


From jldunn2000 at googlemail.com  Tue Feb 10 13:41:07 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 10 Feb 2009 10:41:07 -0800 (PST)
Subject: Using paramiko rsa key
References: <d1cf44ba-62d2-4656-b256-e0680896457e@b16g2000yqb.googlegroups.com>
	<mailman.9236.1234278675.3487.python-list@python.org>
	<41ed4335-66f9-4ff9-9901-77c30be07a82@v19g2000yqn.googlegroups.com>
	<4991b496$0$188$e4fe514c@news.xs4all.nl>
Message-ID: <fba299ee-7bbb-4bf0-946c-c87fcbf0db3e@l1g2000yqj.googlegroups.com>

On 10 Feb, 17:08, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> loial wrote:
> > Can anyone be a little more helpful than Tino?
>
> <cut>
> I'll do some freebie hints :-)
> What I would do is try first whether key authentication works at all,
> for example following a tutorial likehttp://the.earth.li/~sgtatham/putty/0.53b/htmldoc/Chapter8.html
>
> And if that works translate it to the relevant python code.
>
> --
> mph

Thanks..I'll try that first


From goon12 at gmail.com  Tue Feb 10 14:07:55 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Tue, 10 Feb 2009 14:07:55 -0500
Subject: UnitTest break on failure
In-Reply-To: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
References: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
Message-ID: <6a2ccd190902101107l793f7b7ei2ef5c51cdfde3659@mail.gmail.com>

On Tue, Feb 10, 2009 at 11:48 AM, Qian Xu <quian.xu at stud.tu-ilmenau.de> wrote:
>  self.assertEquals(testMethod1(), expected_value1);
>  self.assertEquals(testMethod2(), expected_value2);
>
> However, if the first test item is failed, no more tests will be executed.
> Can I tell Python,
> 1. go ahead, if a failure is occurred.
> 2. stop, if an error is occurred?

Typically you would have a different test for two different methods,
one for each method.


From josh.dukes at microvu.com  Tue Feb 10 14:15:14 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 11:15:14 -0800
Subject: bool evaluations of generators vs lists
Message-ID: <20090210111514.07e0480a@microvu.com>

quite simply...what???

In [108]: bool([ x for x in range(10) if False ])
Out[108]: False

In [109]: bool( x for x in range(10) if False )
Out[109]: True

Why do these two evaluate differently? I was expecting that they would
evaluate the same but the generator would return true *as soon as the
first value is detected*. I'd really expect it to act more like...

def has_values(g):
     for i in g:
         return True
     return False

So what's going on here? Am I using the wrong function or is this
actually just a bug?

-- 

Josh Dukes
MicroVu IT Department


From ntwrkd at gmail.com  Tue Feb 10 14:16:23 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 11:16:23 -0800
Subject: getopt index out of range
Message-ID: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>

Hi List,
I am getting an index out of range error when trying to parse with getopt.
Probably something simple. Any suggestions are appreciated

optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
'adminServerURL=', 'action=', 'targets=', 'appDir='])


#Assign Opts
connectPassword = optlist[0][1]
adminServerURL = optlist[1][1]
action = optlist[2][1]
targets = optlist[3][1]
appDir = optlist[4][1]

#this statement never gets executed
print "Args: " + connectPassword + " " + adminServerURL + " " + action
+ " " + targets + " " + appDir

  File "/home/msacks/untitled4.py", line 23, in ?
IndexError: index out of range: 0

TIA


From aahz at pythoncraft.com  Tue Feb 10 14:18:11 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 11:18:11 -0800
Subject: subprocess.Popen - file like object from stdout=PIPE
References: <49895e45$0$2860$ba620e4c@news.skynet.be>
	<4989864F.50700@skynet.be>
	<mailman.8772.1233749977.3487.python-list@python.org>
	<49899185$0$2861$ba620e4c@news.skynet.be>
Message-ID: <gmsjtj$jnj$1@panix3.panix.com>

In article <49899185$0$2861$ba620e4c at news.skynet.be>,
Helmut Jarausch  <jarausch at skynet.be> wrote:
>
>These pipes are exposed as file-like objects which can be accessed via
>the stdin, stdout or stderr (resp.) attributes of an object of class
>subprocess.Popen .

Please file a doc request at bugs.python.org
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From space.captain.face at gmail.com  Tue Feb 10 14:27:36 2009
From: space.captain.face at gmail.com (Kalibr)
Date: Tue, 10 Feb 2009 11:27:36 -0800 (PST)
Subject: Using TK and the canvas.
Message-ID: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>

Hi all. I'm experimenting with making a UI for a little (well, not
quite) script that basically draws up a tech tree to some skills from
my favorite game. What I'm aiming for looks a little like this site
here:(apologies if I'm not supposed to direct link)
http://www.anderkoo.com/uploads/271/605/NewTechTree.jpg.

Anyway, I made a script which reads data from several files and saves
the data into an array of skill objects, here's what it looks like:

#define the class
class skill:
    def __init__(self, name, description, a1, a2, rank, prereq):
        self.name = name #string (example is "Anchoring")
        self.desc = description #string (example is "blah blah blah")
        self.a1 = a1   #string with attributes affecting the skill
(Example is "Int")
        self.a2 = a2   #string
        self.rank = rank   #how hard it is to train (example is "5")
(too lazy to convert to int
        self.prereq = prereq  #any prerequsites (an array of ["skill",
"levelrequired"])

        #the trained level already
        self.skillowned = "0" #we change this later on when we access
another file :)

Finally, I set up a class which accepts a parent (normally root), and
the skill in question.
here it is:

class SkillInfo:
    def __init__(self, parent, skill):
        container = Frame(parent)
        container.pack()

        #we make this the top frame for some reason
        labelcontainer = Frame(container, height=50, width=50)
        labelcontainer.pack(side=LEFT, fill=BOTH, expand=YES)

        desccont = Frame(container, height=50, width=50) #the
description content
        desccont.pack(side=LEFT, fill=BOTH, expand=YES)

        #make a name label
        Label(labelcontainer, text=skill.name, wraplength=100).pack
(side=TOP, anchor=W)

        #print the level buttons
        for i in range(1, 6):
            button = Button(labelcontainer)
            button["text"] = "Level", i
            if int(skill.skillowned) >= i:
                button["background"] = "green"
                button["width"] = 10
            else:
                button["background"] = "red"
                button["width"] = 10
            button.pack(anchor=W)

        Label(desccont, text=("\n"+skill.desc), wraplength=100).pack()

Now I know all I have to do is set the SkillInfos parent to a canvas,
but how would I arrange and draw the lines? Thanks all :)


From Scott.Daniels at Acm.Org  Tue Feb 10 14:27:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 11:27:57 -0800
Subject: UnitTest break on failure
In-Reply-To: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
References: <gmsb3h$na0$1@inn-newsserver.rz.tu-ilmenau.de>
Message-ID: <xYqdnYGcHflYSQzUnZ2dnUVZ_gOWnZ2d@pdx.net>

Qian Xu wrote:
> i am writing unit tests and have got a problem:
> I want to test some code sequence like:
> 
>  self.assertEquals(testMethod1(), expected_value1);
>  self.assertEquals(testMethod2(), expected_value2);
> 
> However, if the first test item is failed, no more tests will be executed.
> Can I tell Python, 
> 1. go ahead, if a failure is occurred. 
> 2. stop, if an error is occurred?

Well, each test should be independent, so generally you are talking
about multiple tests.  If you really want a test to see if you get
through a sequence in a single test:
     import unittest
     ...
     class MyTest(unittest.TestCase):

         def test_multi_step(self):
             expectations = [(expected_value1, testMethod1),
                             (expected_value2, testMethod2),
                             (final_expected, another_test, arg1, arg2)]
             try:
                 for step, ops in enumerate(expectations):
                     self.assertEquals(ops[0], ops[1](*ops[2:]))
             except Exception, why:
                 raise ValueError('Step %s Failed: %s' % (step, why))
             # here the test passed.
     ...
     if __name__ == '__main__':
         unittest.main()

Note this gives you less information (the traceback doesn't go down
to the actual error), but it shows you what step failed.

--Scott David Daniels
Scott.Daniels at Acm.Org


From geert.discussions at gmail.com  Tue Feb 10 14:29:10 2009
From: geert.discussions at gmail.com (Geert Vancompernolle)
Date: Tue, 10 Feb 2009 20:29:10 +0100
Subject: Python DLL's for C++?
Message-ID: <4991D586.6090600@gmail.com>

Hi,

Is it possible to write DLL's in Python for applications that only 
provide C++ interfaces?  Example: NotePad++ is extendible by writing C++ 
DLL's which can call the NotePad++ interfaces.

I wonder if those DLL's also can be written in Python, which in the end 
calls the C++ interfaces of NotePad++...

-- 
Best rgds,

Geert
________________________________________________

*Use EcoCho <http://www.ecocho.com>: environmentally friendly search the 
internet!*


From steve at holdenweb.com  Tue Feb 10 14:34:16 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 10 Feb 2009 14:34:16 -0500
Subject: Introduction to Python, Washington DC, March 3-5
Message-ID: <4991D6B8.2050002@holdenweb.com>

Holden Web is pleased to announce its next public introductory Python
class in the Washington, DC area on March 3-5. To enroll, or to learn
more about the class please visit:

  http://holdenweb.com/py/training/

If you have multiple students requiring training you may be interested
to know that this course can also be presented on-site.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rgruet at free dot fr  Tue Feb 10 14:38:24 2009
From: rgruet at free dot fr (Richard Gruet)
Date: Tue, 10 Feb 2009 20:38:24 +0100
Subject: ANN: Python 2.6 Quick Reference available
Message-ID: <4991d7b0$0$4785$426a34cc@news.free.fr>

The Python 2.6 Quick Reference is available in HTML and PDF formats at http://rgruet.free.fr/#QuickRef.

This time I was helped by Josh Stone for the update.

As usual, your feedback is welcome (pqr at rgruet.net).

Cheers,

Richard Gruet


From clp2 at rebertia.com  Tue Feb 10 14:38:42 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 11:38:42 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210111514.07e0480a@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
Message-ID: <50697b2c0902101138v2072f95fj19d94dba0714abb3@mail.gmail.com>

On Tue, Feb 10, 2009 at 11:15 AM, Josh Dukes <josh.dukes at microvu.com> wrote:
> quite simply...what???
>
> In [108]: bool([ x for x in range(10) if False ])
> Out[108]: False

This evaluates the list comprehension and creates an empty list, which
is considered boolean False by Python.

> In [109]: bool( x for x in range(10) if False )
> Out[109]: True

Whereas this creates a /generator object/, whose inner expression is
*not evaluated until specifically required* (e.g. by for-looping over
the generator object). Generators don't have a specially defined
truthiness critera (it's impossible to define generally -- consider
something like `x for x in all_integers if f(x)`, for a complicated
f(x), which would require a solution to the halting problem to know in
advance if it will have a non-zero length), so they end up using the
default behavior for objects with otherwise undefined boolean truth,
which is to consider them True.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From marduk at letterboxes.org  Tue Feb 10 14:39:30 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 10 Feb 2009 14:39:30 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210111514.07e0480a@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
Message-ID: <1234294770.8528.14.camel@localhost.localdomain>

On Tue, 2009-02-10 at 11:15 -0800, Josh Dukes wrote:
> quite simply...what???
> 
> In [108]: bool([ x for x in range(10) if False ])
> Out[108]: False
> 
> In [109]: bool( x for x in range(10) if False )
> Out[109]: True
> 
> Why do these two evaluate differently? I was expecting that they would
> evaluate the same but the generator would return true *as soon as the
> first value is detected*. I'd really expect it to act more like...

The first example is a list.  A list of length 0 evaluates to False.

The second example returns a generator object.  A generator object
apparently evaluates to true.  Your example is not iterating of their
values of the generator, but evaluating bool(generator_object) itself.
My feeling is that bool(generator_object) is ambiguous so shouldn't be
used to begin with.

In both examples, bool() doesn't actually iterate over the arguments.
Maybe that's what confused you.

Instead look at this:

>>> type([x for x in range(10) if False ])
<type 'list'>
>>> type((x for x in range(10) if False ))
<type 'generator'>

> def has_values(g):
>      for i in g:
>          return True
>      return False
> 
> So what's going on here? Am I using the wrong function or is this
> actually just a bug?

bool != has_values.  Check python.org for how Python determines the
"truthiness" of an object. Generally speaking the following evaluate to
False:

      * None 
      * False 
      * zero of any numeric type, for example, 0, 0L, 0.0, 0j. 
      * any empty sequence, for example, '', (), []. 
      * any empty mapping, for example, {}. 
      * instances of user-defined classes, if the class defines a
        __nonzero__() or __len__() method, when that method returns the
        integer zero or bool value False.

All other values are considered true -- so objects of many types are
always true.




From benjamin at python.org  Tue Feb 10 14:40:56 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 10 Feb 2009 19:40:56 +0000 (UTC)
Subject: "Super()" confusion
References: <d73785c5-9ffe-491b-bd38-e125b322fd47@k36g2000pri.googlegroups.com>
	<20090210000405.12853.971581682.divmod.quotient.8036@henry.divmod.com>
	<mailman.9198.1234231380.3487.python-list@python.org>
	<6vd0h1Fjele5U1@mid.uni-berlin.de>
Message-ID: <loom.20090210T193904-15@post.gmane.org>

Marc 'BlackJack' Rintsch <bj_666 <at> gmx.net> writes:

> 
> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
> 
> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
> >> Consider whether you really need to use super().
> >> 
> >> http://fuhm.net/super-harmful/
> > 
> > This article chiefly deals with super()'s harm in multiple inteheritance
> > situations. For the simple case, though, like that presented by the OP,
> > I believe super() is perfect.
> 
> But for the simple cases it is unnecessary because it was invented to 
> deal with multiple inheritance problems.

super() is great for single inheritance because it furthers the DRY principle
(base classes are not scattered through the code), and rather ugly use of
unbound methods. 






From exarkun at divmod.com  Tue Feb 10 14:45:23 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 10 Feb 2009 14:45:23 -0500
Subject: "Super()" confusion
In-Reply-To: <loom.20090210T193904-15@post.gmane.org>
Message-ID: <20090210194523.12853.2081273672.divmod.quotient.8354@henry.divmod.com>

On Tue, 10 Feb 2009 19:40:56 +0000 (UTC), Benjamin Peterson <benjamin at python.org> wrote:
>Marc 'BlackJack' Rintsch <bj_666 <at> gmx.net> writes:
>
>>
>> On Tue, 10 Feb 2009 02:02:43 +0000, Benjamin Peterson wrote:
>>
>> > Jean-Paul Calderone <exarkun <at> divmod.com> writes:
>> >> Consider whether you really need to use super().
>> >>
>> >> http://fuhm.net/super-harmful/
>> >
>> > This article chiefly deals with super()'s harm in multiple inteheritance
>> > situations. For the simple case, though, like that presented by the OP,
>> > I believe super() is perfect.
>>
>> But for the simple cases it is unnecessary because it was invented to
>> deal with multiple inheritance problems.
>
>super() is great for single inheritance because it furthers the DRY principle
>(base classes are not scattered through the code), and rather ugly use of
>unbound methods.

It replaces one kind of repetition with another.  I think each kind is
about as unpleasant.  Has anyone gathered any data on the frequency of
changes of base classes as compared to the frequency of classes being
renamed?  I don't think either happens very often, but it might be
interesting to see some numbers.

Jean-Paul


From clp2 at rebertia.com  Tue Feb 10 14:46:24 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 11:46:24 -0800
Subject: Tricky question about native extension packaging
In-Reply-To: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>
References: <07cf55ac-b832-422e-aec0-12756e27ced9@t3g2000yqa.googlegroups.com>
Message-ID: <50697b2c0902101146u1c3a36eav91654b02ddc4d897@mail.gmail.com>

On Tue, Feb 10, 2009 at 8:42 AM,  <olivierbourdon38 at gmail.com> wrote:
> let's assume I (almost) have and extension available as a C file and
> the setup.py and I want to generate from this single c file 2 .so
> files using
>
> cc -DOPTION1 x.c to produce x_1.so
> cc -DOPTION2 x.c to produce x_2.so
>
> and at runtime depending of my OS version either load x_1 or x_2

I don't know about the setup.py part of your question, but as for
choosing between 2 modules at runtime:

#file foo.py
#assuming 'foo' is the desired name of the module
from sys import platform
SUN = 'sunos5'
LINUX = 'linux2'
WIN = 'win32'

if platform == SUN:
    from x_1 import *
elif platform == LINUX:
    from x_2 import *
elif platform == WIN:
    from x_1 import *
else:
    raise RuntimeError, "Unknown/unsupported platform"


Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From version5 at gmail.com  Tue Feb 10 14:46:54 2009
From: version5 at gmail.com (nnp)
Date: Tue, 10 Feb 2009 19:46:54 +0000
Subject: Working with propositional formulae in Python
Message-ID: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>

Hey,

I'm currently working with propositional boolean formulae of the type
'A & (b -> c)' (for example). I was wondering if anybody knows of a
Python library to create parse trees and convert such formulae to
conjunctive, disjunctive and Tseitin normal forms?

Cheers,
nnp

-- 
http://www.unprotectedhex.com
http://www.smashthestack.org


From rt8396 at gmail.com  Tue Feb 10 14:51:07 2009
From: rt8396 at gmail.com (r)
Date: Tue, 10 Feb 2009 11:51:07 -0800 (PST)
Subject: Using TK and the canvas.
References: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>
Message-ID: <41c83165-d6ec-429f-ac27-7d103e0d2d2b@u13g2000yqg.googlegroups.com>

On Feb 10, 1:27?pm, Kalibr <space.captain.f... at gmail.com> wrote:
[snip]
> Now I know all I have to do is set the SkillInfos parent to a canvas,
> but how would I arrange and draw the lines? Thanks all :)

You should really check out wxPython, there is support for just this
type of thing. of course you could do this with Tkinter, but just
thinking about it makes my head hurt :).


From fetchinson at googlemail.com  Tue Feb 10 15:01:53 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 12:01:53 -0800
Subject: "Super()" confusion
In-Reply-To: <op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>

On 2/9/09, Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
> En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson
> <fetchinson at googlemail.com> escribi?:
>
>>>>>> Hello. I've been scouring the web looking for something to clear up a
>>>>>> little confusion about the use of "super()" but haven't found
>>>>>> anything
>>>>>> that really helps. Here's my simple example:
>>>>>>
>>>>>> [snip]
>>>>>>
>>>>>> "super(Child,self).__init__(filePath)
>>>>>> TypeError: super() argument 1 must be type, not classobj"
>>>>>>
>>>>>> What have I done wrong? Thanks in advance for any help.
>>>>>
>>>>> Consider whether you really need to use super().
>>>>>
>>>>> http://fuhm.net/super-harmful/
>>>>
>>>> Did you actually read that article, understood it, went through the
>>>> tons of responses from python-dev team members, including Guido
>>>
>>> Yes.  Why the knee-jerk reaction?
>>
>> Because throwing around that link carries about the same amount of
>> information as "perl is better than python", "my IDE is better than
>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>
> Not at all. It contains accurate and valuable information that isn't
> available elsewhere.

But does not contain other valuable information which would demystify
super. If only this source is shown to a person who wants to learn the
proper usage of super, the impression he/she gets will be distorted.

Example: 1. somebody asks about threading 2. reply comes: there is a
GIL! you can't do real threading. Now this reply might be technically
more-or-less correct, it is misleading and does not help the poster.
An informed discussion of the various solutions that does not involve
a rant about the GIL would be very useful though.

>>> I simply pointed out a resource which
>>> might be helpful to someone trying to learn to use super.
>>
>> It will certainly not be helpful to anyone trying to learn the usage
>> of super. The person who wrote that essay is simply misunderstanding
>> the concept, as has been explained countless times by the python dev
>> team. Hence, it only increases confusion, adds to the noise and
>> spreads false alarm.
>
> AFAIK, all facts appearing in said article are still true (except for 3.x
> which uses a shorter form). If super usage had been clearly documented in
> the first place, this had not happened.
> Perhaps you could point us to some resource explaining how is super
> supposed to be used correctly?
> And of those giving explanations in python-dev, nobody cared to add a
> single word to the Python documentation for years.

You might want to start with

http://www.artima.com/weblogs/viewpost.jsp?thread=236275

You are right, it's not in the documentation. But if somebody asks on
c.l.p the appropriate answer, I think, is to point to information such
as the one above, and not the misleading "harmful" essay.

>> Honestly, I don't understand how this thing got so much out of
>> control. If anyone starts an intelligent question or remark about
>> super, this essay is thrown in no matter what. Anyone can explain why?
>
> Because for a very loooooong time (seven years, 2001-2008) super was
> almost undocumented. The Library Reference -before release 2.6- only had a
> short paragraph, the online documentation referred (and still does) to the
> original essay by Guido introducing descriptors, which is inaccurate and
> outdated, and then the "... harmful" article was the only source of
> information available.
> Worse was the fate of packages and how they're imported: nobody "could be
> bothered to spell that out" (sic); or how import works in general, still
> barely documented (one has to dig into the PEP collection, trying to guess
> what parts are truly implemented and what parts are only a wish...)

You are right, the documentation needs some work in this regard. But
again, just because some sources are not in the documentation doesn't
mean that the most opinionated essay is the best source. A little
search turns up much more useful ones.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From fetchinson at googlemail.com  Tue Feb 10 15:03:18 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 12:03:18 -0800
Subject: "Super()" confusion
In-Reply-To: <pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<mailman.9191.1234229649.3487.python-list@python.org>
	<pan.2009.02.10.03.46.52@REMOVE.THIS.cybersource.com.au>
Message-ID: <fbe2e2100902101203s2042df18rd788802f5e47c0ab@mail.gmail.com>

>>>>> Consider whether you really need to use super().
>>>>>
>>>>> http://fuhm.net/super-harmful/
>>>>
>>>>Did you actually read that article, understood it, went through the
>>>>tons of responses from python-dev team members, including Guido
>
> "Tons" of responses?

This was mentioned already, but just to repeat: one good source, for
example, apart from the python-dev list:

http://www.artima.com/weblogs/viewpost.jsp?thread=236275

> I count 16, about a third of which are written by James Knight himself
> (the author of the page you are ranting against), and of the remaining,
> about half are low-to-zero information content, e.g. Tim Peter's joke
> about renaming the page for better marketing value.
>
> It's especially telling that even Guido, the most vocal critic of the
> article, is critical of the *title* but not the content. In his first
> post, he says: "I agree with the best practices in James's
> Conclusion...", and suggested that if the article was called "Multiple
> Inheritance Pitfalls in Python" he'd be much happier.
>
>
>>> Yes.  Why the knee-jerk reaction?
>>
>> Because throwing around that link carries about the same amount of
>> information as "perl is better than python", "my IDE is better than
>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>
> This is clearly not the case when even the most vocal critic agrees with
> the article's recommendations.
>
>
>>> I simply pointed out a resource which might be helpful to someone
>>> trying to learn to use super.
>>
>> It will certainly not be helpful to anyone trying to learn the usage of
>> super.
>
> I've read it, and found it very useful.
>
>
>> The person who wrote that essay is simply misunderstanding the
>> concept, as has been explained countless times by the python dev team.
>
> "Countless". Is that more or less than the "tons of responses" above?
>
>
>> Hence, it only increases confusion, adds to the noise and spreads false
>> alarm.
>
> So you say.
>
>
>> Honestly, I don't understand how this thing got so much out of control.
>> If anyone starts an intelligent question or remark about super, this
>> essay is thrown in no matter what. Anyone can explain why?
>
> Because inheritance is potentially confusing. Multiple inheritance is
> even more confusing. Multiple inheritance with diamond diagrams even more
> so, and multiple inheritance with diamond diagrams and non-cooperative
> classes are simply impossible to get right.
>
> Because there are many pitfalls to inheritance in Python, and they aren't
> obvious: who on earth would imagine that calling __init__ or __new__ with
> positional arguments could be dangerous? James Knight's article is a well-
> written, understandable description of some of them, in one place and
> with a catchy title. Of course people are going to link to it.
>
> And finally, because people do wrongly get the impression that using
> super will magically make those problems go away. I know this, because I
> was one of them.
>
> (I went through the anger period, sure that Knight must be full of it.
> How could anyone suggest that Guido made a super that isn't perfect? I
> got past that once I realised just how complex inheritance actually is.
> Currently I'm in denial, writing code with super and hoping that it will
> Just Work but not pushing it too hard in case it doesn't.)
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From robert.kern at gmail.com  Tue Feb 10 15:18:55 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 14:18:55 -0600
Subject: Logging in Python
In-Reply-To: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
Message-ID: <gmsnff$pqi$1@ger.gmane.org>

On 2009-02-10 11:50, aha wrote:
> Hello All,
>
> I have an application where logging may need to be configured in
> multiple places.  I've used the Python Logging Framework for sometime,
> but I'm still not sure how to test if logging has configured.  For
> example, I have modules A, B, and C.
>
> Below is some pseudo code...
> moduleA
>
> class A(object):
>    def __init__(self):
>      ...
>
> startLogging(config):
>    # Configure logging
>    # global logger
>    ...
>
> moduleB
> import moduleA
> from myconfig import MyConfig
> class B(object):
>    def __init__(self):
>      # self.config = MyConfig()
>      # if logging has started [HOW DO YOU DO THIS?]
>      #   self.logger = logging.getLogger("moduleB")
>      # else
>      #   self.logger = moduleA.startLogging(self.config)
>      # moduleA.startLogging
>      ...
>
> Where I need help is determining if a logger has already been
> configured.  Any advice?

I just do this in every module in which I'm doing logging:

   import logging
   logger = logging.getLogger(__name__)

I configure my logging only in my main() function(s).

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From martin at v.loewis.de  Tue Feb 10 15:19:28 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 10 Feb 2009 21:19:28 +0100
Subject: Python DLL's for C++?
In-Reply-To: <mailman.9251.1234294155.3487.python-list@python.org>
References: <mailman.9251.1234294155.3487.python-list@python.org>
Message-ID: <4991e150$0$30918$9b622d9e@news.freenet.de>

> Is it possible to write DLL's in Python for applications that only
> provide C++ interfaces?  Example: NotePad++ is extendible by writing C++
> DLL's which can call the NotePad++ interfaces.

Not directly, no. You have to write a C++ DLL which then can delegate
all calls to it to some Python function, and likewise expose Notepad++
API to Python.

> I wonder if those DLL's also can be written in Python, which in the end
> calls the C++ interfaces of NotePad++...

The actual logic can be in Python, but you do need a C++ wrapper module.

OTOH, if Notepad++ would also support COM/ActiveX plugins, then those
could directly be written in Python (assuming the COM interfaces
supported automation).

Regards,
Martin


From bkline at rksystems.com  Tue Feb 10 15:19:59 2009
From: bkline at rksystems.com (Bob Kline)
Date: Tue, 10 Feb 2009 15:19:59 -0500
Subject: Change in cgi module's handling of POST requests
Message-ID: <4991E16F.3010407@rksystems.com>

[Didn't realize the mirror didn't work both ways]

We just upgraded Python to 2.6 on some of our servers and a number of our CGI scripts broke because the cgi module has changed the way it handles POST requests.  When the 'action' attribute was not present in the form element on an HTML page the module behaved as if the value of the attribute was the URL which brought the user to the page with the form, but without the query (?x=y...) part.  Now FieldStorage.getvalue () is giving the script a list of two copies of the value for some of the parameters (folding in the parameters from the previous request) instead of the single string it used to return for each.  I searched this newsgroup looking for a discussion of the proposal to impose this change of behavior, and perhaps I wasn't using the right phrases in my search, but I didn't find anything.  I see that Perl still behaves the way pre-2.6 Python used to (not that I view that as a reason for anything).  We'll work around the breakage by explicitly setting the 'action' attribute everywhere, of course, but I usually see some discussion (often heated) of the impact of behavior changes on existing software when something like this is in the works.  Did I miss it?

I also noted that the module is making some deprecated use of the BaseException class.

Cheers.





From cosmo_general at yahoo.com  Tue Feb 10 15:21:19 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Tue, 10 Feb 2009 12:21:19 -0800 (PST)
Subject: How to get a return from Button?
Message-ID: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>

Hi Folks,

I want to use a Button to trigger askopenfilename() dialog, then I can
select a file. My short code is below:


def select_file():
	filenam = askopenfilename(title='Get the file:')
       return filenam

root = Tk()
Button(root, text='Select a file', command=select_file).pack()
root.mainloop()

My goal is to get the path of filenam, but the function select_file()
has nowhere to return what it selected. Can anybody help me out? I
consulted the book of Programming Python, but found no demo in this
regard. If the function has no return, command=blabla will work
nicely. I am lost in the scope.

Thanks!


Muddy Coder


From vinay_sajip at yahoo.co.uk  Tue Feb 10 15:21:42 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 10 Feb 2009 12:21:42 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
Message-ID: <e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com>

On Feb 10, 5:50 pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
>
> I have an application whereloggingmay need to be configured in
> multiple places.  I've used the PythonLoggingFramework for sometime,
> but I'm still not sure how to test iflogginghas configured.  For
> example, I have modules A, B, and C.
>
> Below is some pseudo code...
> moduleA
>
> class A(object):
>   def __init__(self):
>     ...
>
> startLogging(config):
>   # Configurelogging
>   # global logger
>   ...
>
> moduleB
> import moduleA
> from myconfig import MyConfig
> class B(object):
>   def __init__(self):
>     # self.config = MyConfig()
>     # iflogginghas started [HOW DO YOU DO THIS?]
>     #   self.logger =logging.getLogger("moduleB")
>     # else
>     #   self.logger = moduleA.startLogging(self.config)
>     # moduleA.startLogging
>     ...
>
> Where I need help is determining if a logger has already been
> configured.  Any advice?
>
> Aquil

It depends upon how complicated your logging requirements are. For
example, each module can have the following code in it:

import logging

logging.basicConfig(level=logging.DEBUG, filename="/tmp/myapp.log",
filemode="w") # An example

logger = logging.getLogger(__name__)

... your code, involving logger.debug(...) statements


basicConfig() attaches a FileLogger to the root logger, so all logging
output would be routed to the file "/tmp/myapp.log" in the example.
However, basicConfig() does nothing if the root logger already has
handlers, so calling it in each module shouldn't cause problems. It's
also nice to use the module name (__name__) as the logger name.

Another pattern is to configure logging in your main module, if there
is one, and then the other modules just assume logging is configured
and log away. If there isn't a main module, have all the modules
import a common module which, when imported, configures logging how
you want it. Under normal circumstances, the import code will only run
once, so your logging only gets configured the first time the module
gets imported by any of the others.

Regards,

Vinay Sajip


From aioe.org at technicalbloke.com  Tue Feb 10 15:28:00 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 15:28:00 -0500
Subject: Functional schmunctional...
Message-ID: <gmsnvi$ku$1@aioe.org>

I remember being forced to do a bit of functional programming in ML back
at Uni in the mid 90, the lecturers were all in a froth about it and I
must admit the code was elegant to look at. The problem was the dog slow
performance for anything half practical, especially with recursion being
the technique de jour. The HP workstations we were using were really
quite beefy for their time yet simple ML stuff would just murder the CPU
and RAM. Added to that, recursive stuff could be extremely confusing to
debug so I wrote it off as a nice idea in concept but a waste of my time
for anything practical.

So fast forward 15 years to this very afternoon... I needed a routine to
convert IP address strings to INET numbers and vice-versa and I remember
writing one a couple of years back when I first picked up Python. So I
went and dug it out.  Looking back at old code can be a bit dispiriting
though and this was no exception...

def inet2ip(n):
  p = (n/16777216)
  q = ((n-(p*16777216))/65536)
  r = ((n-((p*16777216)+(q*65536)))/256)
  s = ((n-((p*16777216)+(q*65536)+(r*256))))
  return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

def ip2in(a):
  li = a.split('.')
  assert len(li) == 4
  a = int(li[0])*16777216
  b = int(li[1])*65536
  c = int(li[2])*256
  d = int(li[3])
  return a+b+c+d


I thought "OMG, how naive and inelegant that looks, I can do far better
than that, after all I know things like list comprehensions and
map/reduce now!".  I had also noticed over the last year or two a lot of
chatter about functional programming especially in conjunction with python.

It seems to me that procedural programming has taken quite a kicking
against the more OO and functional methodologies over the last few years
and given my nothing-but-positive experience with OO of late I was
reconsidering the strength of my old opinions on FP. Maybe it was, as my
lecturers thought, the paradigm of the future and I was being a
crotchety old stick in the mud by spurning it as slow and confusing.

With this in mind I set about applying my hard won Python knowledge and
wisdom to the rewriting of these functions, not for any particularly
practical reasons, just to see what improvements I could wreak on them
several years down the line.

The IP string to INET number was first and I decided to throw list
comprehensions at it...

def ip2inet(a):
  li = a.split('.')
  assert len(li) == 4 or len(li) == 6
  return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
xrange(0,len(li))])

Now, that did made it completely unreadable but I thought, "it's pretty
much all one line now so I've gained some conciseness and at least it
should run a little faster". After all list comprehensions are often
fast aren't they? Well actually no, It runs at less than half the speed
of the previous function and now it's entirely lexically impenetrable.

Shit :-(

So far so bad... As inauspicious as these beginnings were I figured I'd
plug on anyway and try a functional approach to the INET number to IP
string function - the above experience having reinforced in me the
notion that clarity is paramount. Functional programming is all about
the clarity and elegance right?

I figured it might be worth trading a few cycles for at least,
especially as the machine I'm using here in 2009 has more RAM and CPU
grunt than whole Uni computer department did back in 1994. Not only that
I would only need to do 4 or 6 recursions in this algorithm and so I
shouldn't need to worry about the exponential inefficiency problems of
yore...

def inet2ip(n, l=[], c=4):
  if c==0: return ".".join(l)
  p = 256**( c-1 )
  l.append( str(n/p) )
  return inet2ip( n-(n/p)*p, l, c-1 )

The thing is, that's not really any clearer though is it?  I'd wager if
you didn't know already it would take you longer to figure out this
version than it would the original.  Still, "at least" I thought "it's
more concise than the last one and it scales to IPv6 far more
elegantly". I figured as long as the performance wasn't too lousy I
would keep it and so I quickly ran a little benchmark to see how much of
a performance hit I would be taking by doing so. The results for 10000
iterations of each were as follows...

0.113744974136 seconds for old INET->IP method
27.7441999912 seconds for new INET->IP method

:-/

FFS!

It just goes to show that...

1) Thinking you're a smart arse and actually being a smart arse are two
quite different things.

2) You should always take received wisdom with a good pinch of salt.

3) People aren't exaggerating when they say Python function calls are
expensive are they!


Roger Heathcote.


From clp2 at rebertia.com  Tue Feb 10 15:30:01 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 12:30:01 -0800
Subject: How to get a return from Button?
In-Reply-To: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>
References: <5ec5a074-9eaa-49e2-a64c-7a63f28d3743@k19g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902101230s1d943a5co1811e2dae6bd48dd@mail.gmail.com>

On Tue, Feb 10, 2009 at 12:21 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I want to use a Button to trigger askopenfilename() dialog, then I can
> select a file. My short code is below:
>
>
> def select_file():
>        filenam = askopenfilename(title='Get the file:')
>       return filenam
>
> root = Tk()
> Button(root, text='Select a file', command=select_file).pack()
> root.mainloop()
>
> My goal is to get the path of filenam, but the function select_file()
> has nowhere to return what it selected. Can anybody help me out? I
> consulted the book of Programming Python, but found no demo in this
> regard. If the function has no return, command=blabla will work
> nicely. I am lost in the scope.

The function has nowhere to return its value to (except somewhere in
the innards of Tkinter, where it's discarded), so indeed it should
*not* return. You instead need to modify some program state to hold
the would-be return value.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From josh.dukes at microvu.com  Tue Feb 10 15:50:02 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 12:50:02 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <1234294770.8528.14.camel@localhost.localdomain>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
Message-ID: <20090210125002.1f6d8597@microvu.com>

> The first example is a list.  A list of length 0 evaluates to False.
> 
> The second example returns a generator object.  A generator object
> apparently evaluates to true.  Your example is not iterating of their
> values of the generator, but evaluating bool(generator_object) itself.
> My feeling is that bool(generator_object) is ambiguous so shouldn't be
> used to begin with.

I was actually aware of that (thank you, though, for trying to help).
What I was not clear on was if the boolean evaluation is a method of an
object that can be modified via operatior overloading (in the same way
+ is actually .__add__()) or not. Clearly __nonzero__ is the operator I
was curious about. Thanks for that info. 

> bool != has_values.  Check python.org for how Python determines the
> "truthiness" of an object. Generally speaking the following evaluate
> to False:
> 
>       * None 
>       * False 
>       * zero of any numeric type, for example, 0, 0L, 0.0, 0j. 
>       * any empty sequence, for example, '', (), []. 
>       * any empty mapping, for example, {}. 
>       * instances of user-defined classes, if the class defines a
>         __nonzero__() or __len__() method, when that method returns
> the integer zero or bool value False.
> 
> All other values are considered true -- so objects of many types are
> always true.

The thing I don't understand is why a generator that has no iterable
values is different from an empty list. Why shouldn't bool ==
has_value?? Technically a list, a tuple, and a string are also objects
but if they lack values they're evaluated as False. It seems to me that
a generator is an object that intends to replace lists where lazy
evaluation would be more efficent. Here is one place where that's
definitely true. 
The main reason I'm interested in this is that it improves performance
immensely over boolean evaluation of large lists (as the attached code
shows). It seems to me if I could use find a good use for it in my
experimentation that someone else might also want to do the same thing
in real-world code. 

Is there another list I should be asking these questions on?

-- 

Josh Dukes
MicroVu IT Department
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From http  Tue Feb 10 15:50:38 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 12:50:38 -0800
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <7xr626ow2p.fsf@ruckus.brouhaha.com>

r0g <aioe.org at technicalbloke.com> writes:
> def inet2ip(n):
>   p = (n/16777216)
>   q = ((n-(p*16777216))/65536)
>   r = ((n-((p*16777216)+(q*65536)))/256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

from struct import pack
def inet2ip(n):
  xs = pack('L',n)
  return '.'.join(str(ord(x)) for x in xs)


From namire at gmail.com  Tue Feb 10 15:54:14 2009
From: namire at gmail.com (namire)
Date: Tue, 10 Feb 2009 12:54:14 -0800 (PST)
Subject: Replace unknow string varible in file.
Message-ID: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>

Hey .python first time poster here. I'm pretty good with python so
far, but I keep needed a function in my program but not knowing how to
build it. =( Here's the problem:

Imagine a html file full of 100's of these strings all mooshed
together onto many lines;
<!--"@@MARKER@@; id=ITEM"-->ITEM<br>
Where the word 'MARKER' is a constant, it stay the same in each string
and the word 'ITEM' is a random combination of ascii characters of an
unknown length. So for example a:
<!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...

What I need to do it replace each instance of the random letter with a
constant and/or delete them. The file is a html file so the stuff
inside of <!-- --> is ok to keep and I need that data to identify
where the strings are in the file (it's full of other stuff too).  I'm
tired making a bruteforcer but with unknown length and 26 letters of
the alphabet I gave up because it would take too long (it was
something like; read file; if '@@MARKER@@; id="'+str(gen_string)+'"--
>"+sr(gen_string)+'<br>' in file then replace with '', but I'm
paraphrasing code and it's not the best solution anyway).

Just as a comparison in the Windows OS this seems easy to do when
managing files, say for the file a-blah-b-blah.tmp where blah is an
unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
python and a string in text file I don't have a clue. @_@ could
someone please help me?


From andrew at acooke.org  Tue Feb 10 15:54:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 10 Feb 2009 17:54:51 -0300 (CLST)
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <a31b3b84713889e3155a703de02e0bf8.squirrel@localhost>

r0g wrote:
> def ip2inet(a):
>   li = a.split('.')
>   assert len(li) == 4 or len(li) == 6
>   return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
> xrange(0,len(li))])

what a mess.

i don't use this extreme a functional style in python (it's not really how
the language is intended to be used), but i think you can do better than
that.

how about:

from itertools import count

def ip2inet(a):
    blocks = a.split('.')
    assert len(blocks) in (4, 6)
    return sum(map(lambda (i, n): int(i) * 256**n,
                   zip(reversed(blocks), count(0))))

i haven't looked at the other function, but as a general comment it sounds
me like you are in such a hurry to point out fp is bad that you haven't
bothered to master it first.

andrew




From aioe.org at technicalbloke.com  Tue Feb 10 15:55:03 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 15:55:03 -0500
Subject: Python Module: nift
References: <9cb28036-7d5f-4b8a-9748-b26c5e9538b4@r15g2000prd.googlegroups.com>
	<a84c1964-361f-43cf-8c2f-e6563b6c3870@m40g2000yqh.googlegroups.com>
	<e664a309-180f-4c1d-98d6-da242d0fb48c@y1g2000pra.googlegroups.com>
Message-ID: <gmspi9$2p8$1@aioe.org>

J wrote:
> Thanks for your answers, especially Chris Rebert and Paul McGuire's. I
> have a question:
> How far does Python go in the Game Development field? (Using Python
> only, no extensions)


Hey J,

Python's all about the libraries (extensions), you won't be able to do
much without them but that's no big whoop. AFAIK most python libs are
released under LGPL or BSD style licenses so there's pretty much no
restriction on what you can use them for. A lot of games are written in
C for performance reasons but most python gaming libs are just wrappers
round C gaming libs and share the same names and methods so your
knowledge should travel with you.

As for which libs to use...

There's PyGame which is a a good mature library for 2D stuff.

Pyglet seem to be the most popular OpenGL lib for 3D stuff.

You might also want to look at the "Blender Game Engine" and the free
game "Yo Frankie", they use C for the heavy lifting and Python for
scripting levels and stuff, it might be a good way to test the waters.

Regards,

Roger Heathcote.


From travis+ml-python at subspacefield.org  Tue Feb 10 15:57:39 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Tue, 10 Feb 2009 14:57:39 -0600
Subject: zlib interface semi-broken
Message-ID: <20090210205739.GT6522@subspacefield.org>

Hello all,

The zlib interface does not indicate when you've hit the end of a compressed stream.

The underlying zlib functionality provides for this.

With python's zlib, you have to read past the compressed data and into
the uncompressed, which gets stored in Decompress.unused_data.

As a result, if you've got a network protocol which mixes compressed
and non-compressed output, you may find a compressed block ending with
no uncompressed data following until you send another command -- which
a synchronous (non-pipelined) client will not send, because it is waiting
for the [compressed] data from the previous command to be finished.

As a result, you get a protocol deadlock.

A simple way to fix this would be to add a finished attribute to the
Decompress object.

However, perhaps this would be a good time to discuss how this library
works; it is somewhat awkward and perhaps there are other changes which
would make it cleaner.

What does the python community think?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From ntwrkd at gmail.com  Tue Feb 10 16:06:50 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 13:06:50 -0800
Subject: optparse versus getopt
Message-ID: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>

does anyone have any arguments against optparse vs getopt


From bmaschino at gmail.com  Tue Feb 10 16:14:02 2009
From: bmaschino at gmail.com (bmaschino at gmail.com)
Date: Tue, 10 Feb 2009 13:14:02 -0800 (PST)
Subject: pySerial help please!
Message-ID: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>

Hello all,

I am very new to Python and I am using it because I needed an easy
language to control a piece of equipment that connects to my computer
via a serial cable. I am running Python 2.6 with pySerial 2.4 under
Windows. I can get Python to create a serial port on COM1, but when I
try to write to the device, nothing happens. Here is an example:

import serial
ser = serial.Serial(0)
ser.write("otpm 2 16 0")
ser.close()

If I connect to the device in Hyperterminal the device will behave as
expected when I give it the command 'otpm 2 16 0' but not in Python. I
have confirmed Python is actually controlling the port because
Hyperterminal will not open the port while Python has it open,
although I have not been able to try a loopback connector as of yet.
Any suggestions out there? Thanks in advance!

Cheers,
Bryce


From robert.kern at gmail.com  Tue Feb 10 16:19:45 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 15:19:45 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
Message-ID: <gmsr1i$8vt$1@ger.gmane.org>

On 2009-02-10 15:06, Matthew Sacks wrote:
> does anyone have any arguments against optparse vs getopt

As the getopt docs say: "A more convenient, flexible, and powerful alternative 
is the optparse module."

I have found all three statements to be true.

But I've found argparse to be even better. The main reason is that argparse will 
help you parse, verify and generate help text for positional arguments in 
addition to --options.

   http://argparse.python-hosting.com/
   http://argparse.python-hosting.com/wiki/ArgparseVsOptparse

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Tue Feb 10 16:19:57 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 13:19:57 -0800
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <PcudnbUz2PWdcgzUnZ2dnUVZ_sninZ2d@pdx.net>

For expressiveness, try something like:

def ip2in(dotted_ip_addr):
     result = 0
     assert dotted_ip_addr.count('.') in (3, 7)
     for chunk in dotted_ip_addr.split('.'):
         result = (result << 8) + int(chunk)
     return result

def inet2ip(ip_number):
     assert 0 < ip_number < 1 << 48
     bytes = []
     while ip_number:
         bytes.append(ip_number & 255)
         ip_number >>= 8
     assert len(bytes) in (4, 6)
     return '.'.join(str(n) for n in reversed(bytes))

--Scott David Daniels
Scott.Daniels at Acm.Org


From vlastimil.brom at gmail.com  Tue Feb 10 16:22:37 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 10 Feb 2009 22:22:37 +0100
Subject: Replace unknow string varible in file.
In-Reply-To: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <9fdb569a0902101322y60a6410bs67d513877dad0f06@mail.gmail.com>

2009/2/10 namire <namire at gmail.com>:
> Hey .python first time poster here. I'm pretty good with python so
> far, but I keep needed a function in my program but not knowing how to
> build it. =( Here's the problem:
>
> Imagine a html file full of 100's of these strings all mooshed
> together onto many lines;
> <!--"@@MARKER@@; id=ITEM"-->ITEM<br>
> Where the word 'MARKER' is a constant, it stay the same in each string
> and the word 'ITEM' is a random combination of ascii characters of an
> unknown length. So for example a:
> <!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
> h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...
>
> What I need to do it replace each instance of the random letter with a
> constant and/or delete them.
>...
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Hi,
It is not quite clear to me, what should be achieved with the given
file, but an example with wildcard characters in windows implies, that
the regular expressions can be of some use here (given the file is as
regular as the samples, especially without nesting the comments etc.)

the segments in examples can be matched eg. with the expression>:

<!--"@@MARKER@@; id=([^"]+)"-->\1<br>

the ITEM, CATFISH, SPAM ... elements are captured in the parethesised
group and can be used foe matching or replacing.

check the re module in the python library:
http://docs.python.org/library/re.html

hth
 vbr


From marduk at letterboxes.org  Tue Feb 10 16:25:47 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 10 Feb 2009 16:25:47 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210125002.1f6d8597@microvu.com>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
Message-ID: <1234301147.8528.47.camel@localhost.localdomain>

On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:

> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list. Why shouldn't bool ==
> has_value?? Technically a list, a tuple, and a string are also objects
> but if they lack values they're evaluated as False. It seems to me that
> a generator is an object that intends to replace lists where lazy
> evaluation would be more efficent. Here is one place where that's
> definitely true. 

Well, I did not implement generators in python, but my guess would be
that lists and tuples can be checked with len() to see if it is
non-empty.  Generators don't have length.  You would at least need to
call .next() which "changes" the generator so every time you'd want to
evaluate the boolean of the generator you'd potentially lose the next
item.

Generators are meant to replace lists where you don't want/can't put the
entire "list" in memory or for which there is no (known) end to the
list. You don't know the next value a generator will return (if any)
until you evaluate it.  Don't think of generators as containers like
lists, tuples and strings are.  Generators don't "contain" values.
Generators are objects that return the "next" value.  It has no idea how
many values it contains (it's not a container).  It only knows the
".next()" value when it's called.  It forgets the value once it's
returned. And it has no idea how far it is in the iteration until it's
finished (StopIteration).

> The main reason I'm interested in this is that it improves performance
> immensely over boolean evaluation of large lists (as the attached code
> shows). It seems to me if I could use find a good use for it in my
> experimentation that someone else might also want to do the same thing
> in real-world code. 

I don't understand what you mean by this.  But if you really want to
know if a generator is "non-empty":

def non_empty(virgin_generator):
    try:
        virgin_generator.next() # note you just lost the first value
        return True
    except StopIteration:
        return False

The only way to get around this is to put all the values of a generator
inside a container (e.g. a list):

l = list(generator_object)

but in doing so you've (obviously) lost the advantages of the generator.


> Is there another list I should be asking these questions on?

I don't know. Sorry I wasn't able to help you.

-a




From Scott.Daniels at Acm.Org  Tue Feb 10 16:36:21 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 13:36:21 -0800
Subject: zlib interface semi-broken
In-Reply-To: <mailman.9266.1234299464.3487.python-list@python.org>
References: <mailman.9266.1234299464.3487.python-list@python.org>
Message-ID: <hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>

Travis wrote:
> The zlib interface does not indicate when you've hit the
 > end of a compressed stream....
> The underlying zlib functionality provides for this.
> 
> With python's zlib, you have to read past the compressed data and into
> the uncompressed, which gets stored in Decompress.unused_data.
> ... [good explanation of why this is problematic] ...
> A simple way to fix this would be to add a finished attribute to the
> Decompress object.
Perhaps you could submit a patch with such a change?

> However, perhaps this would be a good time to discuss how this library
> works; it is somewhat awkward and perhaps there are other changes which
> would make it cleaner.
Well, it might be improvable, I haven't really looked.  I personally
would like it and bz2 to get closer to each other in interface, rather
than to spread out.  SO if you are really opening up a can of worms,
I vote for two cans.

--Scott David Daniels
Scott.Daniels at Acm.Org





From aquil.abdullah at gmail.com  Tue Feb 10 16:38:19 2009
From: aquil.abdullah at gmail.com (aha)
Date: Tue, 10 Feb 2009 13:38:19 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
	<e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com>
Message-ID: <cf33e272-1c35-4496-ab98-853a06fceab8@z1g2000yqn.googlegroups.com>

Thanks for your suggestions.  I've also figured that I can test if
logging.RootLogger.manager.loggerDict has any items in it.  Or if it
has a logger for the module that I wish to start.  I like basicLogger
idea though as it seems like the cleanest implementation.

On Feb 10, 3:21?pm, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On Feb 10, 5:50 pm, aha <aquil.abdul... at gmail.com> wrote:
>
>
>
> > Hello All,
>
> > I have an application whereloggingmay need to be configured in
> > multiple places. ?I've used the PythonLoggingFramework for sometime,
> > but I'm still not sure how to test iflogginghas configured. ?For
> > example, I have modules A, B, and C.
>
> > Below is some pseudo code...
> > moduleA
>
> > class A(object):
> > ? def __init__(self):
> > ? ? ...
>
> > startLogging(config):
> > ? # Configurelogging
> > ? # global logger
> > ? ...
>
> > moduleB
> > import moduleA
> > from myconfig import MyConfig
> > class B(object):
> > ? def __init__(self):
> > ? ? # self.config = MyConfig()
> > ? ? # iflogginghas started [HOW DO YOU DO THIS?]
> > ? ? # ? self.logger =logging.getLogger("moduleB")
> > ? ? # else
> > ? ? # ? self.logger = moduleA.startLogging(self.config)
> > ? ? # moduleA.startLogging
> > ? ? ...
>
> > Where I need help is determining if a logger has already been
> > configured. ?Any advice?
>
> > Aquil
>
> It depends upon how complicated your logging requirements are. For
> example, each module can have the following code in it:
>
> import logging
>
> logging.basicConfig(level=logging.DEBUG, filename="/tmp/myapp.log",
> filemode="w") # An example
>
> logger = logging.getLogger(__name__)
>
> ... your code, involving logger.debug(...) statements
>
> basicConfig() attaches a FileLogger to the root logger, so all logging
> output would be routed to the file "/tmp/myapp.log" in the example.
> However, basicConfig() does nothing if the root logger already has
> handlers, so calling it in each module shouldn't cause problems. It's
> also nice to use the module name (__name__) as the logger name.
>
> Another pattern is to configure logging in your main module, if there
> is one, and then the other modules just assume logging is configured
> and log away. If there isn't a main module, have all the modules
> import a common module which, when imported, configures logging how
> you want it. Under normal circumstances, the import code will only run
> once, so your logging only gets configured the first time the module
> gets imported by any of the others.
>
> Regards,
>
> Vinay Sajip



From python.list at tim.thechases.com  Tue Feb 10 16:38:35 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 10 Feb 2009 15:38:35 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
Message-ID: <4991F3DB.5000802@tim.thechases.com>

Matthew Sacks wrote:
> does anyone have any arguments against optparse vs getopt

I've found that the optparse module beats getopt on *every* 
aspect except in the event that you have experience with the C 
getopt libraries *and* just want something that behaves like 
those libraries.  Optparse is easy to learn, easy to read, and 
part of the Python stdlib.

-tkc






From ntwrkd at gmail.com  Tue Feb 10 16:42:38 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 13:42:38 -0800
Subject: optparse versus getopt
In-Reply-To: <4991F3DB.5000802@tim.thechases.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
Message-ID: <f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>

it seems as if optparse isn't in my standard library.
is there a way to add a lib like ruby gems?

On Tue, Feb 10, 2009 at 1:38 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
> Matthew Sacks wrote:
>>
>> does anyone have any arguments against optparse vs getopt
>
> I've found that the optparse module beats getopt on *every* aspect except in
> the event that you have experience with the C getopt libraries *and* just
> want something that behaves like those libraries.  Optparse is easy to
> learn, easy to read, and part of the Python stdlib.
>
> -tkc
>
>
>
>
>


From bkaplan1 at gmail.com  Tue Feb 10 16:44:37 2009
From: bkaplan1 at gmail.com (Brian Kaplan)
Date: Tue, 10 Feb 2009 16:44:37 -0500
Subject: Cannot get python to read a CAP file link in an ATOM feed
Message-ID: <efa461e10902101344m27664381i551bcd32c2cca6fa@mail.gmail.com>

Hi List,
I'm trying to get python to parse a CAP file in an ATOM feed from the
National Weather Service.  Here's one states ATOM feed.
http://www.weather.gov/alerts-beta/ky.php?x=0.  If you view the source
of this file, there is a reference to another web feed. For instance,
href="http://www.weather.gov/alerts-beta/wwacapget.php?x=KY20090210210200ILNNPWILNHighWindWarning20090212100000KY"
(note, this latter file changes hourly).  I can retrieve and parse the
first file but cannot get the second file read or parsed as an xml. I
am able to read it into memory using urlopen.  Can python read and
parse as an xml or do I need to read it into memory.  If it is in
memory, is there a similar parsing function.  Thanks  Brian Kaplan


From space.captain.face at gmail.com  Tue Feb 10 16:46:20 2009
From: space.captain.face at gmail.com (Kalibr)
Date: Tue, 10 Feb 2009 13:46:20 -0800 (PST)
Subject: Using TK and the canvas.
References: <28740c97-58fa-4fa7-9321-28c05d5520b8@n33g2000pri.googlegroups.com>
	<41c83165-d6ec-429f-ac27-7d103e0d2d2b@u13g2000yqg.googlegroups.com>
Message-ID: <06c439f8-e010-4709-9f4d-890977ac7558@w24g2000prd.googlegroups.com>

On Feb 11, 5:51?am, r <rt8... at gmail.com> wrote:
> On Feb 10, 1:27?pm, Kalibr <space.captain.f... at gmail.com> wrote:
> [snip]
>
> You should really check out wxPython, there is support for just this
> type of thing. of course you could do this with Tkinter, but just
> thinking about it makes my head hurt :).

Alright, I shall investigate. Thank you.


From robert.kern at gmail.com  Tue Feb 10 16:48:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 15:48:04 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
Message-ID: <gmssmk$eai$1@ger.gmane.org>

On 2009-02-10 15:42, Matthew Sacks wrote:
> it seems as if optparse isn't in my standard library.

How did you install your Python? It has been part of the standard library for a 
very long time.

> is there a way to add a lib like ruby gems?

http://docs.python.org/install/index.html

But optparse (named Optik when it was a separate package) has not been 
distributed separately from Python for a long time.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From http  Tue Feb 10 16:51:58 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 13:51:58 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
Message-ID: <7x63jiez9d.fsf@ruckus.brouhaha.com>

Travis <travis+ml-python at subspacefield.org> writes:
> However, perhaps this would be a good time to discuss how this library
> works; it is somewhat awkward and perhaps there are other changes which
> would make it cleaner.
> 
> What does the python community think?

It is missing some other features too, like the ability to preload
a dictionary.  I'd support extending the interface.  


From bearophileHUGS at lycos.com  Tue Feb 10 16:52:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 10 Feb 2009 13:52:11 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>

Here a small benchmark:

def ip2inet01(a): # can't be used with 6
    li = a.split('.')
    assert len(li) == 4
    a = int(li[0])*16777216
    b = int(li[1])*65536
    c = int(li[2])*256
    d = int(li[3])
    return a+b+c+d

from itertools import count

def ip2inet02(a):
    blocks = a.split('.')
    assert len(blocks) in (4, 6)
    return sum(map(lambda (i, n): int(i) * 256**n, zip(reversed
(blocks), count(0))))

def ip2inet03(iptxt):
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by * 256**po for po, by in enumerate(bytes))

def ip2inet04(iptxt):
    bytes = map(int, reversed(iptxt.strip().split(".")))
    assert len(bytes) in (4, 6)
    powers256 = [1, 256, 65536, 16777216, 4294967296, 1099511627776]
    return sum(by * powers256[po] for po, by in enumerate(bytes))

def ip2inet05(iptxt):
    bytes = (int(by) for by in reversed(iptxt.strip().split(".")))
    parts = [by * ip2inet05.powers256[po] for po, by in enumerate
(bytes)]
    assert len(parts) in (4, 6)
    return sum(parts)
ip2inet05.powers256 = [1, 256, 65536, 16777216, 4294967296,
1099511627776]

def ip2inet06(a):
    li = a.split('.')
    n = len(li)
    assert n == 4 or n == 6
    if n == 4:
        return (int(li[0]) * 16777216 +
                 int(li[1]) * 65536 +
                 int(li[2]) * 256 +
                 int(li[3]))
    else:
        return (int(li[0]) * 1099511627776 +
                 int(li[1]) * 4294967296 +
                 int(li[2]) * 16777216 +
                 int(li[3]) * 65536 +
                 int(li[4]) * 256 +
                 int(li[5]))

def ip2inet07(iptxt):
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by * ip2inet07.pows[po] for po, by in enumerate(bytes))
ip2inet07.pows = [1, 256, 65536, 16777216, 4294967296, 1099511627776]

from struct import pack
def ip2inet08(n): # error
  xs = pack('L', n)
  return '.'.join(str(ord(x)) for x in xs)

def ip2inet09(iptxt): # short and readable
    bytes = map(int, iptxt.strip().split("."))[::-1]
    assert len(bytes) in (4, 6)
    return sum(by << (8*po) for po, by in enumerate(bytes))

def ip2inet10(iptxt):
    count = 0
    result = 0
    for byte in iptxt.strip().split("."):
        result <<= 8
        result += int(byte)
        count += 1
    assert count in (4, 6)
    return result

def ip2inet11(iptxt):
    bytes = iptxt.strip().split(".")
    assert len(bytes) in (4, 6)
    result = 0
    for byte in bytes:
        result <<= 8
        result += int(byte)
    return result

def ip2inet12(iptxt):
    bytes = iptxt.strip().split(".")
    assert len(bytes) in (4, 6)
    result = 0
    for byte in bytes:
        result = (result << 8) + int(byte)
    return result

def ip2inet13(a): # fastest and readable
    li = a.split('.')
    n = len(li)
    assert n == 4 or n == 6
    if n == 4:
        return ((int(li[0]) << 24) +
                 (int(li[1]) << 16) +
                 (int(li[2]) << 8) +
                 int(li[3]))
    else:
        return ((int(li[0]) << 40) +
                 (int(li[1]) << 32) +
                 (int(li[2]) << 24) +
                 (int(li[3]) << 16) +
                 (int(li[4]) << 8) +
                 int(li[5]))



def main():
    from timeit import default_timer as clock

    ip4 = "155.16.187.87"
    ip6 = "7.155.16.187.87.255"
    algos = [ip2inet02, ip2inet03, ip2inet04, ip2inet05, ip2inet06,
             ip2inet07, ip2inet09, ip2inet10, ip2inet11, ip2inet12,
             ip2inet13]
    for algo in algos:
        assert algo(ip4) == 2601565015 and algo(ip6) == 8362582038527
        t0 = clock()
        for i in xrange(10000):
            algo(ip4)
            algo(ip6)
        print algo.__name__, round(clock() - t0, 2), "s"

    import psyco; psyco.full()
    print "With Psyco:"
    for algo in algos:
        t0 = clock()
        for i in xrange(10000):
            algo(ip4)
            algo(ip6)
        print algo.__name__, round(clock() - t0, 2), "s"


main()

ip2inet02 2.68 s
ip2inet03 1.79 s
ip2inet04 1.72 s
ip2inet05 1.88 s
ip2inet06 0.98 s
ip2inet07 1.57 s
ip2inet09 1.5 s
ip2inet10 1.07 s
ip2inet11 1.07 s
ip2inet12 1.03 s
ip2inet13 0.95 s

With Psyco (indipendent run! Not normally successive):
ip2inet02 2.66 s
ip2inet03 1.66 s
ip2inet04 1.97 s
ip2inet05 1.66 s
ip2inet06 0.57 s
ip2inet07 1.5 s
ip2inet09 1.54 s
ip2inet10 0.53 s
ip2inet11 0.76 s
ip2inet12 0.52 s
ip2inet13 0.8 s

So if you need speed you the version #13 is better, if you want short
and readable code (but not too much slow) you can use #9, and if you
want code easy to understand by every one and easy to translate to
other languages then you can use #12.

Bye,
bearophile


From aleksandr.goretoy at gmail.com  Tue Feb 10 16:53:26 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Tue, 10 Feb 2009 15:53:26 -0600
Subject: GAE read binary file into db.BlobProperty()
In-Reply-To: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>
References: <fa98a9e30902090907m28d06cf3r85ba753707e6389a@mail.gmail.com>
Message-ID: <fa98a9e30902101353xec45cd1w82fc2e55d73446a8@mail.gmail.com>

was not able to use open to open a binary file.... so what I did was use
urlfetch to fetch the image for me and read the content into BlobProperty()
Not sure why it took me so long to figure this out. Hope it helps someone.
thx

  def post(self,key):
    k=db.get(key)
      img=images.Image(urlfetch.Fetch("http://www.example.com/
"+k.image).content)
      img.rotate(90)
      jpg_data= img.execute_transforms(images.JPEG)
      k.image_blob=jpg_data
      k.put()

-Alex Goretoy
http://www.goretoy.com



On Mon, Feb 9, 2009 at 11:07 AM, alex goretoy
<aleksandr.goretoy at gmail.com>wrote:

> How to read Binary file into GAE(Google App Engine) db.BlobProperty()
> datastore?
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
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From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 16:57:56 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 21:57:56 GMT
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:

> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list.

How do you know it has no iterable values until you call next() on it and 
get StopIteration?

By the way, your "has_values" function is just a slower version of the 
built-in any().


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 16:58:36 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 21:58:36 GMT
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:43:20 +0000, Lie Ryan wrote:

> Of course multi-core processor can improve single function using
> multiprocessing, as long as the function is parallelizable. The
> Fibonacci function is not a parallelizable function though.

As I understand it, there's very little benefit to multi-cores in Python 
due to the GIL. 


-- 
Steven.


From aioe.org at technicalbloke.com  Tue Feb 10 17:00:44 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 17:00:44 -0500
Subject: Replace unknow string varible in file.
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <gmstde$7ka$1@aioe.org>

namire wrote:
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?

Hi Namire,

The equivalent thing in programming languages is "Regular Expressions",
also known as "regex". It's like a small pattern matching sub-language.

There quite a lot more to it than the odd "*" so it might take a bit of
googling around and study to really understand it but the principle is
the same.

In python you need to import the 're' module.

Have a look at this, the replace method is called 'sub'...

http://www.amk.ca/python/howto/regex/regex.html

Take your time with it though, it can be confusing until you get used to
it and when you're building an expression don't try and do it all at
once, start small and build it up a little at a time.

Roger Heathcote.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:01:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:01:29 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<01a16bc0$0$20660$c3e8da3@news.astraweb.com>
Message-ID: <pan.2009.02.10.22.01.29@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 22:41:25 +1000, Gerhard Weis wrote:

> btw. the timeings are not that different for the naive recursion in OP's
> version and yours.
> fib(500) on my machine:
> 	OP's: 0.00116 (far away from millions of years) 
> This here: 0.000583

I don't believe those timings are credible. On my machine, it took a 
minute to calculate fib(38), and while my machine isn't exactly the 
fastest box possible, nor is it especially slow.

I don't wish to imply that you are deliberately lying, but your result of 
0.00116 seconds for the naive version of fib(500) is so unrealistic in my 
experience that I believe you must be confused. Perhaps you've timed a 
less naive fib() but thought it was the naive version.

Unless somebody can point out an error in my analysis, I'm sticking to my 
earlier claim that the naive version of fib(500) requires an unbelievably 
huge number of function calls: significantly more than the value of fib
(500) itself. See my earlier post in this thread for details.



-- 
Steven


From tjreedy at udel.edu  Tue Feb 10 17:02:44 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:02:44 -0500
Subject: generator object or 'send' method?
In-Reply-To: <dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>	<mailman.9202.1234243720.3487.python-list@python.org>	<pan.2009.02.10.06.04.17@REMOVE.THIS.cybersource.com.au>
	<mailman.9219.1234269022.3487.python-list@python.org>
	<dc913582-1ff1-4164-a93a-5c3c8cdd61c1@p36g2000prp.googlegroups.com>
Message-ID: <gmsti0$i1c$1@ger.gmane.org>

Aaron Brady wrote:

> I guess a generator that counts, but skips K numbers, where K can be
> varied.  For instance, you initialize it with N, the starting number,
> and K, the jump size.  Then, you can change either one later on.

This specification is incomplete as to the timing of when changes to N 
take effect and when variable K is applied.

> This gets two birds with one stone, but is it possible?

If you write an iterator class instead of trying to stretch the 
abbreviated form beyond its intention, and the specification is 
coherent, it should be trivial.



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:02:57 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:02:57 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
Message-ID: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 12:06:06 +0000, Duncan Booth wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 
>> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>> 
>>> How would I do separate lines into words without scanning one
>>> character at a time?
>> 
>> Scan a line at a time, then split each line into words.
>> 
>> 
>> for line in open('myfile.txt'):
>>     words = line.split()
>> 
>> 
>> should work for a particularly simple-minded idea of words.
>> 
> Or for a slightly less simple minded splitting you could try re.split:
> 
>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']


Perhaps I'm missing something, but the above regex does the exact same 
thing as line.split() except it is significantly slower and harder to 
read.

Neither deal with quoted text, apostrophes, hyphens, punctuation or any 
other details of real-world text. That's what I mean by "simple-minded".


-- 
Steven


From clp2 at rebertia.com  Tue Feb 10 17:05:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 14:05:19 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
	<pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <50697b2c0902101405w70c08991o85fabf5f08dabebf@mail.gmail.com>

On Tue, Feb 10, 2009 at 1:57 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:
>
>> The thing I don't understand is why a generator that has no iterable
>> values is different from an empty list.
>
> How do you know it has no iterable values until you call next() on it and
> get StopIteration?
>
> By the way, your "has_values" function is just a slower version of the
> built-in any().

<nitpick>
Not quite: if the generator produces one or more elements but those
elements happen to be boolean false according to Python, then any()
will be false but has_values() will be true. The functions serve
different purposes (produces at least 1 value vs. has at least one
true value).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From josh.dukes at microvu.com  Tue Feb 10 17:09:48 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 10 Feb 2009 14:09:48 -0800
Subject: bool evaluations of generators vs lists
In-Reply-To: <pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<mailman.9264.1234299007.3487.python-list@python.org>
	<pan.2009.02.10.21.57.56@REMOVE.THIS.cybersource.com.au>
Message-ID: <20090210140948.6a362143@microvu.com>

ahhh any! ok, yeah, I guess that's what I was looking for. Thanks.


On 10 Feb 2009 21:57:56 GMT
Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote:
> 
> > The thing I don't understand is why a generator that has no iterable
> > values is different from an empty list.
> 
> How do you know it has no iterable values until you call next() on it
> and get StopIteration?
> 
> By the way, your "has_values" function is just a slower version of
> the built-in any().
> 
> 


-- 

Josh Dukes
MicroVu IT Department


From vinay_sajip at yahoo.co.uk  Tue Feb 10 17:21:03 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 10 Feb 2009 14:21:03 -0800 (PST)
Subject: Logging in Python
References: <958a7679-6116-44e0-b448-fec34d36c486@v13g2000yqm.googlegroups.com>
	<e9b2698c-943f-42a3-b73b-54fa4d56b2c6@m42g2000yqb.googlegroups.com> 
	<cf33e272-1c35-4496-ab98-853a06fceab8@z1g2000yqn.googlegroups.com>
Message-ID: <fe0b8c32-1cb6-4bed-899b-c36fc616bdf1@l1g2000yqj.googlegroups.com>

On Feb 10, 9:38 pm, aha <aquil.abdul... at gmail.com> wrote:
> Thanks for your suggestions.  I've also figured that I can test iflogging.RootLogger.manager.loggerDict has any items in it.  Or if it
> has a logger for the module that I wish to start.  I like basicLogger
> idea though as it seems like the cleanest implementation.
>

It's best not to dig into the implementation details, as these might
change across versions of Python. Any of the suggestions that Robert
and I made should be able to solve your problem in the right way.

Best regards,

Vinay Sajip


From kp8 at mac.com  Tue Feb 10 17:22:35 2009
From: kp8 at mac.com (kpp9c)
Date: Tue, 10 Feb 2009 14:22:35 -0800 (PST)
Subject: Python Launcher.app on OS X
References: <2caa16ad-bc2c-4ade-ba1b-d39103066cbd@33g2000yqm.googlegroups.com>
	<2C317868-F9B0-4EFA-8FF8-88232C20E301@semanchuk.com>
	<ec96e1390902100849g20617b82o86e54678acf3fbfb@mail.gmail.com> 
	<mailman.9243.1234285389.3487.python-list@python.org>
Message-ID: <3e505dfe-7df5-4ace-87c8-1eab7d451ea7@u13g2000yqg.googlegroups.com>

So how does this effect the install instructions found on the link:

http://wiki.python.org/moin/MacPython/Leopard

do you trash that when you do an install on OS X? I am so hesitant to
delete anything that resides in /System





From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 17:26:39 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 22:26:39 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 02:05:35 -0800, Niklas Norrthon wrote:

> According to the common definition of fibonacci numbers fib(0) = 0, fib
> (1) = 1 and fib(n) = fib(n-1) + fib(n-2) for n > 1. So the number above
> is fib(501).

So it is. Oops, off by one error!

Or, if you prefer, it's the right algorithm for a Lucas sequence with 
first two values 1 and 1 instead of 0 and 1. :)



>>>> timeit.Timer('fib(500)', 'from __main__ import fib').timeit(1)
>>
>> 0.00083398818969726562
> 
> And now for my version (which admitedly isn't really mine, and returns
> slightly incorrect fib(n) for large values of n, due to the limited
> floating point precision).

The floating point version is nice, but it starts giving incorrect 
answers relatively early, from n=71. But if you don't need accurate 
results (a relative error of 3e-15 for n=71), it is very fast.



-- 
Steven


From tjreedy at udel.edu  Tue Feb 10 17:29:23 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:29:23 -0500
Subject: bool evaluations of generators vs lists
In-Reply-To: <20090210125002.1f6d8597@microvu.com>
References: <20090210111514.07e0480a@microvu.com>	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
Message-ID: <gmsv40$ni3$1@ger.gmane.org>

Josh Dukes wrote:

> 
> I was actually aware of that (thank you, though, for trying to help).
> What I was not clear on was if the boolean evaluation is a method of an
> object that can be modified via operatior overloading (in the same way
> + is actually .__add__()) or not. Clearly __nonzero__ is the operator I
> was curious about. Thanks for that info. 

.__bool__ in 3.0.


> The thing I don't understand is why a generator that has no iterable
> values is different from an empty list. Why shouldn't bool ==
> has_value?? Technically a list, a tuple, and a string are also objects
> but if they lack values they're evaluated as False. It seems to me that
> a generator is an object that intends to replace lists where lazy
> evaluation would be more efficent. Here is one place where that's
> definitely true. 

Generator functions are abbreviated iterator classes.  If you want 
iterators with more functionality, write an iterator class.  In 
particular, you can add a .__bool__ method for empty or not or even a 
.__len__ method if you can accurately calculate the number of items 
remaining.

> The main reason I'm interested in this is that it improves performance
> immensely over boolean evaluation of large lists (as the attached code
> shows). It seems to me if I could use find a good use for it in my
> experimentation that someone else might also want to do the same thing
> in real-world code. 

Terry Jan Reedy



From tdelaney at avaya.com  Tue Feb 10 17:31:33 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Wed, 11 Feb 2009 06:31:33 +0800
Subject: Python binaries with VC++ 8.0?
In-Reply-To: <1732ba01-6096-4d38-a09d-fe1fbe75b435@l1g2000yqj.googlegroups.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01111E65@301081ANEX2.global.avaya.com>

bearophileHUGS at lycos.com wrote:

> Paul Rubin:
>> Gideon Smeding of the University of
>> Utrecht has written a masters' thesis titled "An executable
>> operational semantics for Python".
> 
> A significant part of Computer Science is a waste of time and money.

The same can be said for any research. Can you predict ahead of time
which research will be useful, and which won't? If so (and you can prove
it) why aren't you making unbelievable amounts of money?

Tim Delaney


From gweis at gmx.at  Tue Feb 10 17:31:46 2009
From: gweis at gmx.at (Gerhard Weis)
Date: Wed, 11 Feb 2009 08:31:46 +1000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.07.34.56@REMOVE.THIS.cybersource.com.au>
	<01a12e1d$0$30497$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<01a16bc0$0$20660$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.22.01.29@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a1f61a$0$21875$c3e8da3@news.astraweb.com>

On 2009-02-11 08:01:29 +1000, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:

> On Tue, 10 Feb 2009 22:41:25 +1000, Gerhard Weis wrote:
> 
>> btw. the timeings are not that different for the naive recursion in OP's
>> version and yours.
>> fib(500) on my machine:
>> 	OP's: 0.00116 (far away from millions of years)
>> This here: 0.000583
> 
> I don't believe those timings are credible. On my machine, it took a
> minute to calculate fib(38), and while my machine isn't exactly the
> fastest box possible, nor is it especially slow.
> 
> I don't wish to imply that you are deliberately lying, but your result of
> 0.00116 seconds for the naive version of fib(500) is so unrealistic in my
> experience that I believe you must be confused. Perhaps you've timed a
> less naive fib() but thought it was the naive version.
> 
> Unless somebody can point out an error in my analysis, I'm sticking to my
> earlier claim that the naive version of fib(500) requires an unbelievably
> huge number of function calls: significantly more than the value of fib
> (500) itself. See my earlier post in this thread for details.

I am sorry for the wrong timing, I mixed up the function names. The 
naive version used partly your version and partly the naive recursion. 
So less naive is a good description :)

after fixing it:
naive fib(38): ~40seconds



From tjreedy at udel.edu  Tue Feb 10 17:33:06 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:33:06 -0500
Subject: Working with propositional formulae in Python
In-Reply-To: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>
References: <28749c0e0902101146i4bc3e69ds898ebe8527f904b8@mail.gmail.com>
Message-ID: <gmsvau$ni3$2@ger.gmane.org>

nnp wrote:
> Hey,
> 
> I'm currently working with propositional boolean formulae of the type
> 'A & (b -> c)' (for example). I was wondering if anybody knows of a
> Python library to create parse trees and convert such formulae to
> conjunctive, disjunctive and Tseitin normal forms?

You would probably do better with Google.
"Python conjunctive normal form"
gave some potentially interesting hits.



From Scott.Daniels at Acm.Org  Tue Feb 10 17:33:35 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 14:33:35 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7x63jiez9d.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
Message-ID: <8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>

Paul Rubin wrote:
> Travis <travis+ml-python at subspacefield.org> writes:
>> However, perhaps this would be a good time to discuss how [zlib] works...
> It is missing some other features too, like the ability to preload
> a dictionary.  I'd support extending the interface.

The trick to defining a preload interface is avoiding creating a brittle
interface -- the saved preload should be usable across machines and
versions.  I suspect that is why such an interface never came up (If
you can clone states, then you can say: "compress this, then use the
resultant state to compress/decompress others."  Suddenly there is no
nasty problem guessing what to parameterize and what to fix in stone.


--Scott David Daniels
Scott.Daniels at Acm.Org


From google at mrabarnett.plus.com  Tue Feb 10 17:39:48 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 10 Feb 2009 22:39:48 +0000
Subject: pySerial help please!
In-Reply-To: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <49920234.90009@mrabarnett.plus.com>

bmaschino at gmail.com wrote:
> Hello all,
> 
> I am very new to Python and I am using it because I needed an easy
> language to control a piece of equipment that connects to my computer
> via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> Windows. I can get Python to create a serial port on COM1, but when I
> try to write to the device, nothing happens. Here is an example:
> 
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()
> 
> If I connect to the device in Hyperterminal the device will behave as
> expected when I give it the command 'otpm 2 16 0' but not in Python. I
> have confirmed Python is actually controlling the port because
> Hyperterminal will not open the port while Python has it open,
> although I have not been able to try a loopback connector as of yet.
> Any suggestions out there? Thanks in advance!
> 
Have you checked that the baud rate, parity, etc, are the same as in
Hyperterminal?


From deets at nospam.web.de  Tue Feb 10 17:41:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 10 Feb 2009 23:41:09 +0100
Subject: pySerial help please!
In-Reply-To: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <6vee48FjmnodU1@mid.uni-berlin.de>

bmaschino at gmail.com schrieb:
> Hello all,
> 
> I am very new to Python and I am using it because I needed an easy
> language to control a piece of equipment that connects to my computer
> via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> Windows. I can get Python to create a serial port on COM1, but when I
> try to write to the device, nothing happens. Here is an example:
> 
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()
> 
> If I connect to the device in Hyperterminal the device will behave as
> expected when I give it the command 'otpm 2 16 0' but not in Python. I
> have confirmed Python is actually controlling the port because
> Hyperterminal will not open the port while Python has it open,
> although I have not been able to try a loopback connector as of yet.
> Any suggestions out there? Thanks in advance!

You need to give a newline, you press return on the terminal as well, 
don't you?

Diez


From python.list at tim.thechases.com  Tue Feb 10 17:46:30 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 10 Feb 2009 16:46:30 -0600
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
Message-ID: <499203C6.9070501@tim.thechases.com>

>> Or for a slightly less simple minded splitting you could try re.split:
>>
>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> 
> 
> Perhaps I'm missing something, but the above regex does the exact same 
> thing as line.split() except it is significantly slower and harder to 
> read.
> 
> Neither deal with quoted text, apostrophes, hyphens, punctuation or any 
> other details of real-world text. That's what I mean by "simple-minded".

   >>> s = "The quick brown fox jumps, and falls over."
   >>> import re
   >>> re.split(r"(\w+)", s)[1::2]
   ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
   >>> s.split()
   ['The', 'quick', 'brown', 'fox', 'jumps,', 'and', 'falls', 
'over.']

Note the difference in "jumps" vs. "jumps,"  (extra comma in the 
string.split() version) and likewise the period after "over". 
Thus not quite "the exact same thing as line.split()".

I think an easier-to-read variant would be

   >>> re.findall(r"\w+", s)
   ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']

which just finds words.  One could also just limit it to letters with

   re.findall("[a-zA-Z]", s)

as "\w" is a little more encompassing (letters and underscores) 
if that's a problem.

-tkc






From rhodri at wildebst.demon.co.uk  Tue Feb 10 17:47:07 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 10 Feb 2009 22:47:07 -0000
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo5qwtbga8ncjz@gnudebst>

On Tue, 10 Feb 2009 22:02:57 -0000, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> wrote:

> On Tue, 10 Feb 2009 12:06:06 +0000, Duncan Booth wrote:
>
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>
>>> On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>>>
>>>> How would I do separate lines into words without scanning one
>>>> character at a time?
>>>
>>> Scan a line at a time, then split each line into words.
>>>
>>>
>>> for line in open('myfile.txt'):
>>>     words = line.split()
>>>
>>>
>>> should work for a particularly simple-minded idea of words.
>>>
>> Or for a slightly less simple minded splitting you could try re.split:
>>
>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>
>
> Perhaps I'm missing something, but the above regex does the exact same
> thing as line.split() except it is significantly slower and harder to
> read.
>
> Neither deal with quoted text, apostrophes, hyphens, punctuation or any
> other details of real-world text. That's what I mean by "simple-minded".

You're missing something :-)  Specifically, the punctuation gets swept
up with the whitespace, and the extended slice skips it.  Apostrophes
(and possibly hyphenation) are still a bit moot, though.



-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From tjreedy at udel.edu  Tue Feb 10 17:57:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 17:57:54 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmsnvi$ku$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <gmt0pf$t6u$1@ger.gmane.org>

r0g wrote:

> 
> def inet2ip(n):
>   p = (n/16777216)
>   q = ((n-(p*16777216))/65536)
>   r = ((n-((p*16777216)+(q*65536)))/256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

Beyond what other wrote:
To future-proof code, use // instead of / for integer division.
To get both quotient and remainder, use divmod(num,den)
For future reading (and generalization) documenting magic constants helps.

In 3.0:

def inet2ip(n):
   p = (n//16777216)
   q = ((n-(p*16777216))//65536)
   r = ((n-((p*16777216)+(q*65536)))//256)
   s = ((n-((p*16777216)+(q*65536)+(r*256))))
   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

def inet2ip2(n):
     p,n=divmod(n,16777216) # 1<<24
     q,n=divmod(n,65536) # 1<<16
     r,s=divmod(n,256) # 1<<8
     return str(p)+"."+str(q)+"."+str(r)+"."+str(s)

print(inet2ip(1000000000), inet2ip2(1000000000))

 >>>
59.154.202.0 59.154.202.0



From paul at boddie.org.uk  Tue Feb 10 17:59:35 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 10 Feb 2009 14:59:35 -0800 (PST)
Subject: "Super()" confusion
References: <mailman.9256.1234295132.3487.python-list@python.org>
Message-ID: <b874abc4-f951-44f4-a6e5-540c3d99d191@v13g2000yqm.googlegroups.com>

On 10 Feb, 20:45, Jean-Paul Calderone <exar... at divmod.com> wrote:
>
> It replaces one kind of repetition with another.  I think each kind is
> about as unpleasant.  Has anyone gathered any data on the frequency of
> changes of base classes as compared to the frequency of classes being
> renamed?  I don't think either happens very often, but it might be
> interesting to see some numbers.

Base class changes are less important than common derived class
functionality. For example, I have employed the following style of
class hierarchy in at least one system:

class ResourceUsingClass:

    """
    Stuff using some resource, like a file.
    Should we close the file when we're finished with it?
    Is that rude? Best not do it!
    """

    def close(self):
        pass # Don't close anything!

class SelfContainedResourceUsingClass(ResourceUsingClass):

    """
    We don't care about keeping the resource open in this class.
    The user of the class should just need to call the close method.
    """

    def close(self):
        ResourceUsingClass.close(self)
        # Now close the resource!

I know that there would be other ways of solving this problem, but in
this case, for every class we want to subclass and provide such
functionality, we need to write a specific close method. With super,
we can avoid being specific about the superclass, but we still need to
write the method unless we define it in a mix-in which appears before
the superclass in the method resolution order.

I think this is the only real use I've found for super, mostly
because, as you say, in most other situations it doesn't actually save
anyone very much effort.

Paul


From tjreedy at udel.edu  Tue Feb 10 18:03:35 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 10 Feb 2009 18:03:35 -0500
Subject: Replace unknow string varible in file.
In-Reply-To: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
Message-ID: <gmt143$t6u$2@ger.gmane.org>

namire wrote:
> Hey .python first time poster here. I'm pretty good with python so
> far, but I keep needed a function in my program but not knowing how to
> build it. =( Here's the problem:
> 
> Imagine a html file full of 100's of these strings all mooshed
> together onto many lines;
> <!--"@@MARKER@@; id=ITEM"-->ITEM<br>
> Where the word 'MARKER' is a constant, it stay the same in each string
> and the word 'ITEM' is a random combination of ascii characters of an
> unknown length. So for example a:
> <!--"@@MARKER@@; id=CATFISH"-->CATFISH<br><h1>Text text text</
> h1><!--"@@MARKER@@; id=SPAM"-->SPAM<br> and so on...
> 
> What I need to do it replace each instance of the random letter with a
> constant and/or delete them. The file is a html file so the stuff
> inside of <!-- --> is ok to keep

I cannot understand what you want to do where.  The last phrase implies 
'leave the comments alone' but you only talked about random letters 
within the comments.  I suggest a minimal but complete example of 
possible input and desired output.

 > and I need that data to identify
> where the strings are in the file (it's full of other stuff too).  I'm
> tired making a bruteforcer but with unknown length and 26 letters of
> the alphabet I gave up because it would take too long (it was
> something like; read file; if '@@MARKER@@; id="'+str(gen_string)+'"--
>> "+sr(gen_string)+'<br>' in file then replace with '', but I'm
> paraphrasing code and it's not the best solution anyway).
> 
> Just as a comparison in the Windows OS this seems easy to do when
> managing files, say for the file a-blah-b-blah.tmp where blah is an
> unknown you can use: del a-*-b-*.tmp to get rid of that file. But for
> python and a string in text file I don't have a clue. @_@ could
> someone please help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 18:11:10 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Feb 2009 23:11:10 GMT
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
	<mailman.9283.1234305998.3487.python-list@python.org>
Message-ID: <pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>

On Tue, 10 Feb 2009 16:46:30 -0600, Tim Chase wrote:

>>> Or for a slightly less simple minded splitting you could try re.split:
>>>
>>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
>>>>>> over.")[1::2]
>>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>> 
>> 
>> Perhaps I'm missing something, but the above regex does the exact same
>> thing as line.split() except it is significantly slower and harder to
>> read.

...

> Note the difference in "jumps" vs. "jumps,"  (extra comma in the
> string.split() version) and likewise the period after "over". Thus not
> quite "the exact same thing as line.split()".

Um... yes. I'll just slink away quietly now... nothing to see here...


-- 
Steven


From travis+ml-python at subspacefield.org  Tue Feb 10 18:12:15 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Tue, 10 Feb 2009 17:12:15 -0600
Subject: zlib interface semi-broken
In-Reply-To: <hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
Message-ID: <20090210231215.GU6522@subspacefield.org>

On Tue, Feb 10, 2009 at 01:36:21PM -0800, Scott David Daniels wrote:
> >A simple way to fix this would be to add a finished attribute to the
> >Decompress object.
> Perhaps you could submit a patch with such a change?

Yes, I will try and get to that this week.

> >However, perhaps this would be a good time to discuss how this library
> >works; it is somewhat awkward and perhaps there are other changes which
> >would make it cleaner.
> Well, it might be improvable, I haven't really looked.  I personally
> would like it and bz2 to get closer to each other in interface, rather
> than to spread out.  SO if you are really opening up a can of worms,
> I vote for two cans.

Well, I like this idea; perhaps this is a good time to discuss the
equivalent of some "abstract base classes", or "interfaces", for
compression.

As I see it, the fundamental abstractions are the stream-oriented
de/compression routines.  Given those, one should easily be able to
implement one-shot de/compression of strings.  In fact, that is the
way that zlib is implemented; the base functions are the
stream-oriented ones and there is a layer on top of convenience
functions that do one-shot compression and decompression.

After examining the bz2 module, I notice that it has a file-like
interface called bz2file, which is roughly analogous to the gzip
module.  That file interface could form a third API, and basically
conform to what python expects of files.

So what I suggest is a common framework of three APIs; a sequential
compression/decompression API for streams, a layer (potentially
generic) on top of those for strings/buffers, and a third API for
file-like access.  Presumably the file-like access can be implemented
on top of the sequential API as well.

If the sequential de/compression routines are indeed primitive, and
sufficient for the implementation of the other two APIs, then that
gives us the option of implementing the other "upper" two layers in
pure python, potentially simplifying the amount of extension code that
has to be written.  I see that as desirable, since it gives us options
for writing the upper two layers; in pure python, or by writing
extensions to the C code where available.

I seem to recall a number of ancilliary functions in zlib, such as
those for loading a compression dictionary.  There are also options
such as flushing the compression in order to be able to resynchronize
should part of the archive become garbled.  Where these functions are
available, they could be implemented, though it would be desirable to
give them the same name in each module to allow client code to test
for their existence in a compression-agnostic way.

For what it's worth, I would rather see a pythonic interface to the
libraries than a simple-as-can-be wrapper around the C functions.  I
personally find it annoying to have to drop down to non-OOP styles in
a python program in order to use a C library.  It doesn't matter to me
whether the OOP layer is added atop the C library in pure python or in
the C-to-python binding; that is an implementation detail to me, and I
suspect to most python programmers.  They don't care, they just want
it easy to use from python.  If performance turns out to matter, and
the underlying compression library supports an "upper layer" in C,
then we have the option for using that code.

So my suggestion is that we (the python users) brainstorm on how we
want the API to look, and not focus on the underlying library except
insofar as it informs our discussion of the proper APIs - for example,
features such as flushing state, setting compression levels/windows,
or for resynchronization points.

My further suggestion is that we start with the sequential
de/compression, since it seems like a fundamental primitive.
De/compressing strings will be trivial, and the file-like interface is
already described by Python.

So my first suggestion on the stream de/compression API thread is:

The sequential de/compression needs to be capable of returning
more than just the de/compressed data.  It should at least be
capable of returning end-of-stream conditions and possibly
other states as well.  I see a few ways of implementing this:

1) The de/compression object holds state in various members such as
data input buffers, data output buffers, and a state for indicating
states such as synchronization points or end-of-stream states.  Member
functions are called and primarily manipulate the data members of the
object.

2) The de/compression object has routines for reading de/compressed
data and states such as end-of-stream or resynchronization points as
exceptions, much like the file class can throw EOFError.  My problem
with this is that client code has to be cognizant of the possible
exceptions that might be thrown, and so one cannot easily add new
exceptions should the need arise.  For example, if we add an exception
to indicate a possible resynchronization point, client code may not
be capable of handling it as a non-fatal exception.

Thoughts?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From google at mrabarnett.plus.com  Tue Feb 10 18:20:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 10 Feb 2009 23:20:05 +0000
Subject: Scanning a file character by character
In-Reply-To: <pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>	<mailman.9283.1234305998.3487.python-list@python.org>
	<pan.2009.02.10.23.11.08@REMOVE.THIS.cybersource.com.au>
Message-ID: <49920BA5.5010008@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Tue, 10 Feb 2009 16:46:30 -0600, Tim Chase wrote:
> 
>>>> Or for a slightly less simple minded splitting you could try re.split:
>>>>
>>>>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
>>>>>>> over.")[1::2]
>>>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>>>
>>> Perhaps I'm missing something, but the above regex does the exact same
>>> thing as line.split() except it is significantly slower and harder to
>>> read.
> 
> ...
> 
>> Note the difference in "jumps" vs. "jumps,"  (extra comma in the
>> string.split() version) and likewise the period after "over". Thus not
>> quite "the exact same thing as line.split()".
> 
> Um... yes. I'll just slink away quietly now... nothing to see here...
> 
You could've used str.translate to strip out the unwanted characters.


From dchandran1 at tinkercell.com  Tue Feb 10 18:21:57 2009
From: dchandran1 at tinkercell.com (Deepak Chandran)
Date: Tue, 10 Feb 2009 15:21:57 -0800
Subject: embedding Python in a shared library
Message-ID: <5dfe78f40902101521o443684fdje8450f19ed881060@mail.gmail.com>

I have embedded Python in a shared library. This works fine in Windows
(dll), but I get the following error is Ubuntu when I try to load modules:

/usr/lib/python2.5/lib-dynload/*time.so*: error: symbol lookup error: *
undefined* symbol: PyExc_ValueError


I found many postings on this issue on the internet, but I was not able to
find a solution that worked. I tried to load libpython2.5.so.1 into my
program using dlopen, but that crashed the program for some reason. I tried
building my library using the libpython2.5.a, but the same error was there.

I am sure someone has a solution to this, since it seems like a general
issue.
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From ntwrkd at gmail.com  Tue Feb 10 18:32:28 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 15:32:28 -0800
Subject: optparse versus getopt
In-Reply-To: <gmssmk$eai$1@ger.gmane.org>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
	<gmssmk$eai$1@ger.gmane.org>
Message-ID: <f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>

its a debian package. 2.5

importing optparse works with interactive python, but not through the
jython interpreter i an using.

is there some way i can force the import based on the the absolute
path to the module?

On Tue, Feb 10, 2009 at 1:48 PM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-10 15:42, Matthew Sacks wrote:
>>
>> it seems as if optparse isn't in my standard library.
>
> How did you install your Python? It has been part of the standard library
> for a very long time.
>
>> is there a way to add a lib like ruby gems?
>
> http://docs.python.org/install/index.html
>
> But optparse (named Optik when it was a separate package) has not been
> distributed separately from Python for a long time.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it
> had
>  an underlying truth."
>  -- Umberto Eco
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From aioe.org at technicalbloke.com  Tue Feb 10 18:38:20 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 18:38:20 -0500
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
	<f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>
Message-ID: <gmt34e$elu$1@aioe.org>

bearophileHUGS at lycos.com wrote:
> Here a small benchmark:
> 
> def ip2inet01(a): # can't be used with 6
>     li = a.split('.')
<snip>

Wow, thanks everybody for all the suggestions, v.interesting esp as I
didn't even ask for any suggestions!  This is a fantastically didactic
newsgroup: you start off just musing about functional programming, you
end up learning python has a rich set of augmented assignment operators,
brilliant :-)


Roger Heathcote.


From robert.kern at gmail.com  Tue Feb 10 18:39:48 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 10 Feb 2009 17:39:48 -0600
Subject: optparse versus getopt
In-Reply-To: <f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>	<4991F3DB.5000802@tim.thechases.com>	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>	<gmssmk$eai$1@ger.gmane.org>
	<f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
Message-ID: <gmt385$4r6$1@ger.gmane.org>

On 2009-02-10 17:32, Matthew Sacks wrote:
> its a debian package. 2.5
>
> importing optparse works with interactive python, but not through the
> jython interpreter i an using.

Ah, yes. The current version of Jython is still based off of Python 2.2 whereas 
optparse was introduced in Python 2.3.

> is there some way i can force the import based on the the absolute
> path to the module?

Better would be for you to copy the optparse.py module onto your Jython's import 
path. I'm not particularly familiar with the details of Jython, so you will need 
to consult with the Jython documentation unless if a Jython expert can jump in 
here. Here is one message describing this procedure:

   http://osdir.com/ml/lang.jython.user/2004-01/msg00086.html

You may want to ask Jython specific questions on the Jython mailing list. You 
will probably get more on-target answers faster there.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From http  Tue Feb 10 18:51:08 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 15:51:08 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
	<8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>
Message-ID: <7xd4dpsvf7.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> I suspect that is why such an interface never came up (If
> you can clone states, then you can say: "compress this, then use the
> resultant state to compress/decompress others." 

The zlib C interface supports something like that.  It is just not
exported to the python application.  It should be.


From aioe.org at technicalbloke.com  Tue Feb 10 18:55:17 2009
From: aioe.org at technicalbloke.com (r0g)
Date: Tue, 10 Feb 2009 18:55:17 -0500
Subject: Escaping my own chroot...
Message-ID: <gmt446$fq0$1@aioe.org>

I'm writing a linux remastering script in python where I need to chroot
into a folder, run some system commands and then come out and do some
tidying up, un-mounting proc & sys etc.

I got in there with os.chroot() and I tried using that to get back out
but that didn't work so... is my script trapped in there forever now or
is there an un-hacky way to escape?

If it is an OS restriction rather than my ignorance of python is there a
canonical way of dealing with it? Should I maybe fork a process, have it
do the chroot and wait for it to terminate before continuing?

Apologies if this turn out to be OT!


Roger.


From bmaschino at gmail.com  Tue Feb 10 19:02:40 2009
From: bmaschino at gmail.com (bmaschino at gmail.com)
Date: Tue, 10 Feb 2009 16:02:40 -0800 (PST)
Subject: pySerial help please!
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
	<6vee48FjmnodU1@mid.uni-berlin.de>
Message-ID: <047322d9-9311-42b8-a1cf-f17830606e27@s20g2000yqh.googlegroups.com>

On Feb 10, 5:41?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> bmasch... at gmail.com schrieb:
>
>
>
>
>
> > Hello all,
>
> > I am very new to Python and I am using it because I needed an easy
> > language to control a piece of equipment that connects to my computer
> > via a serial cable. I am running Python 2.6 with pySerial 2.4 under
> > Windows. I can get Python to create a serial port on COM1, but when I
> > try to write to the device, nothing happens. Here is an example:
>
> > import serial
> > ser = serial.Serial(0)
> > ser.write("otpm 2 16 0")
> > ser.close()
>
> > If I connect to the device in Hyperterminal the device will behave as
> > expected when I give it the command 'otpm 2 16 0' but not in Python. I
> > have confirmed Python is actually controlling the port because
> > Hyperterminal will not open the port while Python has it open,
> > although I have not been able to try a loopback connector as of yet.
> > Any suggestions out there? Thanks in advance!
>
> You need to give a newline, you press return on the terminal as well,
> don't you?
>
> Diez- Hide quoted text -
>
> - Show quoted text -

Yes! That was exactly the problem. I replaced ser.write("otpm x x x")
to ("otpm x x x\n") and it WORKS!! Thank you!


From aahz at pythoncraft.com  Tue Feb 10 19:08:20 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 16:08:20 -0800
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <gmt4tk$jph$1@panix3.panix.com>

In article <4c7158d2-5663-46b9-b950-be81bd79964c at z6g2000pre.googlegroups.com>,
Emanuele D'Arrigo <manu3d at gmail.com> wrote:
>
>I'm having a ball with the power of regular expression but I stumbled
>on something I don't quite understand:

Book recommendation: _Mastering Regular Expressions_, Jeffrey Friedl
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 19:28:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 10 Feb 2009 22:28:46 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
Message-ID: <op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 18:01:53 -0200, Daniel Fetchinson  
<fetchinson at googlemail.com> escribi?:
> On 2/9/09, Gabriel Genellina <gagsl-py2 at yahoo.com.ar> wrote:
>> En Mon, 09 Feb 2009 23:34:05 -0200, Daniel Fetchinson
>> <fetchinson at googlemail.com> escribi?:
>>
>>>>>> Consider whether you really need to use super().
>>>>>> http://fuhm.net/super-harmful/
>>>
>>> Because throwing around that link carries about the same amount of
>>> information as "perl is better than python", "my IDE is better than
>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>>
>> Not at all. It contains accurate and valuable information that isn't
>> available elsewhere.
>
> But does not contain other valuable information which would demystify
> super. If only this source is shown to a person who wants to learn the
> proper usage of super, the impression he/she gets will be distorted.

Why so? At the end there is a "best practices" recipe that pretty much  
summarizes the proper usage of super, and AFAIK it's the right way to use  
it. Don't you agree with any of the conclusions?

> Example: 1. somebody asks about threading 2. reply comes: there is a
> GIL! you can't do real threading. Now this reply might be technically
> more-or-less correct, it is misleading and does not help the poster.
> An informed discussion of the various solutions that does not involve
> a rant about the GIL would be very useful though.

As I said, the article presents a "recipe" for super() usage, and I'd  
consider it very helpful. It's far from just saying "super s*cks!", or  
"the GIL s*cks!" or something like that.

> You might want to start with
>
> http://www.artima.com/weblogs/viewpost.jsp?thread=236275

...which, although the author says it was written a long time ago, was not  
published until less than six months ago, and has very low visibility.

> You are right, it's not in the documentation. But if somebody asks on
> c.l.p the appropriate answer, I think, is to point to information such
> as the one above, and not the misleading "harmful" essay.

According to Google, nobody has menctioned the "harmful" essay in this  
group since April 2008 [1], months before Simionato's article were  
available... So this is the *first* time the reference to the former essay  
could have been replaced by M.S.' one... don't be so strict!

Anyway, the right thing to do, IMHO, is to publish correct and accurate  
documentation in the main Python site. Not everybody knows about this  
group existence, nor has the time/experience/interest on subscribe here,  
post a question and wait for an answer. I've seen some posts in python-dev  
saying something like "this is confusing, we should evangelize people on  
c.l.p. on the right way to do it" and I completely disagree; the right  
place for such things is the product documentation, or -to a much lesser  
degree because it's online only- some article collection linked from the  
main site (like the "Other resources" left bar, already present).

>>> Honestly, I don't understand how this thing got so much out of
>>> control. If anyone starts an intelligent question or remark about
>>> super, this essay is thrown in no matter what. Anyone can explain why?
>>
>> Because for a very loooooong time (seven years, 2001-2008) super was
>> almost undocumented. The Library Reference -before release 2.6- only  
>> had a short paragraph, the [...]
>
> You are right, the documentation needs some work in this regard. But
> again, just because some sources are not in the documentation doesn't
> mean that the most opinionated essay is the best source. A little
> search turns up much more useful ones.

(not according to Google [2]: I get the "harmful" article in the top, the  
thread in python-dev, a couple threads in c.l.p including posts by M.S.,  
his article in artima, and nothing more relevant than "Monty Python Super  
Star" up to the 3rd page)

*Now* that *I* am aware of the recent article series by M.S., the next  
time someone asks *me* about super(), probably I'll refer her to both M.S.  
and J.K.'s articles. Last time I checked (perhaps one or two years ago),  
the "harmful" article was almost the only relevant source of info about  
super().

[1]  
http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
[2] http://www.google.com/search?q=python+super

-- 
Gabriel Genellina



From evanstimk at gmail.com  Tue Feb 10 19:56:43 2009
From: evanstimk at gmail.com (tkevans)
Date: Tue, 10 Feb 2009 16:56:43 -0800 (PST)
Subject: relocation R_X86_64_32 against `a local symbol' can not be used when 
	making a shared object; recompile with -fPIC
Message-ID: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>

Found a couple of references to this in the newsgroup, but no
solutions.

I'm trying to build libsbml-3.3.0 with python 2.5.4 support on RHEL
5.3.  This RedHat distro has python 2.4.5, and libsbml builds ok with
that release.

After building 2.5.4 (./configure CFLAGS=-fPIC , as the error message
suggests), ld still croaks here:

g++ -L../../ -L/usr/local/lib/python2.5/config   -shared -o
_libsbml.so libsbml_wrap.o -lsbml -lpython2.5 -lxml2 -lz -lm -lm   -lz
-lbz2
/usr/bin/ld: /usr/local/lib/python2.5/config/libpython2.5.a
(abstract.o): relocation R_X86_64_32 against `a local symbol' can not
be used when making a shared object; recompile with -fPIC
/usr/local/lib/python2.5/config/libpython2.5.a: could not read
symbols: Bad value
collect2: ld returned 1 exit status

Help appreciated


From noama at answers.com  Tue Feb 10 20:02:00 2009
From: noama at answers.com (Noam Aigerman)
Date: Wed, 11 Feb 2009 03:02:00 +0200
Subject: Propagating function calls
Message-ID: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>

Suppose I have a python object X, which holds inside it a python object
Y. How can I propagate each function call to X so the same function call
in Y will be called, i.e:

X.doThatFunkyFunk()

Would cause

Y.doThatFunkyFunk()

Thanks, Noam

-------------- next part --------------
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From python at bdurham.com  Tue Feb 10 20:03:41 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 20:03:41 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmt34e$elu$1@aioe.org>
References: <gmsnvi$ku$1@aioe.org>
	<f99045d4-2489-4c39-a342-d98898f25e0c@l1g2000yqj.googlegroups.com>
	<gmt34e$elu$1@aioe.org>
Message-ID: <1234314221.16319.1299684607@webmail.messagingengine.com>

> This is a fantastically didactic newsgroup: you start off just musing about <fill-in-the-blank>, you end up learning python has <some great feature>, brilliant :-)

+1 !!

Malcolm


From clp2 at rebertia.com  Tue Feb 10 20:10:40 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 17:10:40 -0800
Subject: Propagating function calls
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
Message-ID: <50697b2c0902101710t54130e57h3c2472ab9d57999b@mail.gmail.com>

On Tue, Feb 10, 2009 at 5:02 PM, Noam Aigerman <noama at answers.com> wrote:
> Suppose I have a python object X, which holds inside it a python object Y.
> How can I propagate each function call to X so the same function call in Y

That'd be a method call actually, not a function call.

> will be called, i.e:
>
> X.doThatFunkyFunk()
>
> Would cause
>
> Y.doThatFunkyFunk()

Use a simple proxy (this will forward attribute accesses too, but that
doesn't usually matter and can be worked around if necessary):

class Delegator(object):
    def __init__(self, delegate):
        self.delegate = delegate
    def __getattr__(self, attr):
        return getattr(self.delegate, attr)

Example:
>>> a=Delegator([])
>>> a.append(5)
>>> a.delegate
[5]

Note that this won't forward the operator special methods (e.g. __add__).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From ntwrkd at gmail.com  Tue Feb 10 20:12:46 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 17:12:46 -0800
Subject: getopt
Message-ID: <f257b9ab0902101712y5f1162ddic32dd5ec5fcd6d64@mail.gmail.com>

if anyone can have a look at this code and offer suggestions i would
appreciate it.
i am forced to use getopt, so i cant use something good like optparse

passedArgs = sys.argv[1:]
optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
"adminServerURL=", "action=", "targets=", "appDir="])


for some reason this does not work in assigning args to opts.


i want to take all of the command line options and assign them to strings

here is how i am currently going about it

for o,a in optlist:
	if o == "--connectPassword":
		connectPassword = a
		print "Connect password assigned as " + a
                continue
	elif o == "--adminServerURL":
		adminServerURL = a
		print "adminServerURL " + a
                continue
	else:
		print "No connection Arguments Specified"
		

TIV


From prologic at shortcircuit.net.au  Tue Feb 10 20:24:49 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Wed, 11 Feb 2009 11:24:49 +1000
Subject: Propagating function calls
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C01024@jermail1.atomant.net>
Message-ID: <e1a84d570902101724x58ea4b86s2504d261e4be9757@mail.gmail.com>

On Wed, Feb 11, 2009 at 11:02 AM, Noam Aigerman <noama at answers.com> wrote:
> Suppose I have a python object X, which holds inside it a python object Y.
> How can I propagate each function call to X so the same function call in Y
> will be called, i.e:
>
> X.doThatFunkyFunk()
>
> Would cause
>
> Y.doThatFunkyFunk()

Noam, using circuits [1] you could do this:

----
from circuits import Event, Component, Manager

class X(Component):

   def doThatFunkyFunk(self):
      ...

class Y(Component):

   def doThatFunkyFunk(self):
      ...

manager = Manager()
manager += X()
manager += Y()

manager.send(Event(), "doThatFunkyFunk")
----

cheers
James

[1] http://pypi.python.org/pypi/circuits/


From sjmachin at lexicon.net  Tue Feb 10 20:25:44 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 17:25:44 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org>
Message-ID: <e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>

On Feb 11, 12:12?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> if anyone can have a look at this code and offer suggestions i would
> appreciate it.
> i am forced to use getopt, so i cant use something good like optparse
>
> passedArgs = sys.argv[1:]
> optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",

Dunno where you acquired the str() ... just lose it. Consider checking
with the documentation when something "does not work".

> "adminServerURL=", "action=", "targets=", "appDir="])
>
> for some reason this does not work in assigning args to opts.
>


From aahz at pythoncraft.com  Tue Feb 10 20:28:57 2009
From: aahz at pythoncraft.com (Aahz)
Date: 10 Feb 2009 17:28:57 -0800
Subject: Upgrade 2.6 to 3.0
References: <669c42cc-4f4d-40be-b842-6f778959d391@f40g2000pri.googlegroups.com>
	<S_-dnZ-gFaz4YBTUnZ2dnUVZ_sHinZ2d@pdx.net>
	<mailman.8812.1233793086.3487.python-list@python.org>
	<2ba4f763-79fa-423e-b082-f9de829ae964@i20g2000prf.googlegroups.com>
Message-ID: <gmt9kp$a1f$1@panix3.panix.com>

In article <2ba4f763-79fa-423e-b082-f9de829ae964 at i20g2000prf.googlegroups.com>,
Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>
>Just out of curiosity, am I the only one who think that switching to
>3.x right now is not a good idea?

Hardly.  I certainly wouldn't consider it for production software, but
installing it to play with probably is a Good Idea -- it's the future,
after all.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 10 20:58:07 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 11 Feb 2009 01:58:07 GMT
Subject: Avoiding argument checking in recursive calls
Message-ID: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>

I sometimes write recursive functions like this simple factorial:


def fact(n):
    if n < 0: raise ValueError
    if n = 0: return 1
    return fact(n-1)*n 

At the risk of premature optimization, I wonder if there is an idiom for 
avoiding the unnecessary test for n <= 0 in the subsequent recursive 
calls? For the sake of the argument, let's pretend the test is expensive 
and I have a good reason for wanting to avoid it on subsequent calls :)



I've done this:

def _fact(n):
    if n = 0: return 1
    return _fact(n-1)*n 

def fact(n):
    if n < 0: raise ValueError
    return _fact(n)

but that's ugly. What else can I do?



-- 
Steven


From fetchinson at googlemail.com  Tue Feb 10 21:25:57 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 10 Feb 2009 18:25:57 -0800
Subject: "Super()" confusion
In-Reply-To: <op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>

>>>>>>> Consider whether you really need to use super().
>>>>>>> http://fuhm.net/super-harmful/
>>>>
>>>> Because throwing around that link carries about the same amount of
>>>> information as "perl is better than python", "my IDE is better than
>>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
>>>
>>> Not at all. It contains accurate and valuable information that isn't
>>> available elsewhere.
>>
>> But does not contain other valuable information which would demystify
>> super. If only this source is shown to a person who wants to learn the
>> proper usage of super, the impression he/she gets will be distorted.
>
> Why so? At the end there is a "best practices" recipe that pretty much
> summarizes the proper usage of super, and AFAIK it's the right way to use
> it. Don't you agree with any of the conclusions?
>
>> Example: 1. somebody asks about threading 2. reply comes: there is a
>> GIL! you can't do real threading. Now this reply might be technically
>> more-or-less correct, it is misleading and does not help the poster.
>> An informed discussion of the various solutions that does not involve
>> a rant about the GIL would be very useful though.
>
> As I said, the article presents a "recipe" for super() usage, and I'd
> consider it very helpful. It's far from just saying "super s*cks!", or
> "the GIL s*cks!" or something like that.
>
>> You might want to start with
>>
>> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
>
> ...which, although the author says it was written a long time ago, was not
> published until less than six months ago, and has very low visibility.
>
>> You are right, it's not in the documentation. But if somebody asks on
>> c.l.p the appropriate answer, I think, is to point to information such
>> as the one above, and not the misleading "harmful" essay.
>
> According to Google, nobody has menctioned the "harmful" essay in this
> group since April 2008 [1], months before Simionato's article were
> available... So this is the *first* time the reference to the former essay
> could have been replaced by M.S.' one... don't be so strict!
>
> Anyway, the right thing to do, IMHO, is to publish correct and accurate
> documentation in the main Python site. Not everybody knows about this
> group existence, nor has the time/experience/interest on subscribe here,
> post a question and wait for an answer. I've seen some posts in python-dev
> saying something like "this is confusing, we should evangelize people on
> c.l.p. on the right way to do it" and I completely disagree; the right
> place for such things is the product documentation, or -to a much lesser
> degree because it's online only- some article collection linked from the
> main site (like the "Other resources" left bar, already present).
>
>>>> Honestly, I don't understand how this thing got so much out of
>>>> control. If anyone starts an intelligent question or remark about
>>>> super, this essay is thrown in no matter what. Anyone can explain why?
>>>
>>> Because for a very loooooong time (seven years, 2001-2008) super was
>>> almost undocumented. The Library Reference -before release 2.6- only
>>> had a short paragraph, the [...]
>>
>> You are right, the documentation needs some work in this regard. But
>> again, just because some sources are not in the documentation doesn't
>> mean that the most opinionated essay is the best source. A little
>> search turns up much more useful ones.
>
> (not according to Google [2]: I get the "harmful" article in the top, the
> thread in python-dev, a couple threads in c.l.p including posts by M.S.,
> his article in artima, and nothing more relevant than "Monty Python Super
> Star" up to the 3rd page)
>
> *Now* that *I* am aware of the recent article series by M.S., the next
> time someone asks *me* about super(), probably I'll refer her to both M.S.
> and J.K.'s articles. Last time I checked (perhaps one or two years ago),
> the "harmful" article was almost the only relevant source of info about
> super().
>
> [1]
> http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
> [2] http://www.google.com/search?q=python+super

Okay, I think we converged to a common denominator. I agree with you
that the documentation needs additions about super and I also agree
with you that referring to both MS and JK articles is appropriate when
a question about super comes up.

It's good to have a discussion when views actually converge and not
diverge at the end :)

Cheers,
Daniel


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From benjamin.kaplan at case.edu  Tue Feb 10 21:31:06 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 10 Feb 2009 21:31:06 -0500
Subject: "Super()" confusion
In-Reply-To: <fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
	<fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
Message-ID: <ec96e1390902101831o49b619e8u4b5234397fd3c2d7@mail.gmail.com>

On Tue, Feb 10, 2009 at 9:25 PM, Daniel Fetchinson <
fetchinson at googlemail.com> wrote:

> >>>>>>> Consider whether you really need to use super().
> >>>>>>> http://fuhm.net/super-harmful/
> >>>>
> >>>> Because throwing around that link carries about the same amount of
> >>>> information as "perl is better than python", "my IDE is better than
> >>>> yours", "vim rulez!", "emacs is cooler than vim", etc, etc.
> >>>
> >>> Not at all. It contains accurate and valuable information that isn't
> >>> available elsewhere.
> >>
> >> But does not contain other valuable information which would demystify
> >> super. If only this source is shown to a person who wants to learn the
> >> proper usage of super, the impression he/she gets will be distorted.
> >
> > Why so? At the end there is a "best practices" recipe that pretty much
> > summarizes the proper usage of super, and AFAIK it's the right way to use
> > it. Don't you agree with any of the conclusions?
> >
> >> Example: 1. somebody asks about threading 2. reply comes: there is a
> >> GIL! you can't do real threading. Now this reply might be technically
> >> more-or-less correct, it is misleading and does not help the poster.
> >> An informed discussion of the various solutions that does not involve
> >> a rant about the GIL would be very useful though.
> >
> > As I said, the article presents a "recipe" for super() usage, and I'd
> > consider it very helpful. It's far from just saying "super s*cks!", or
> > "the GIL s*cks!" or something like that.
> >
> >> You might want to start with
> >>
> >> http://www.artima.com/weblogs/viewpost.jsp?thread=236275
> >
> > ...which, although the author says it was written a long time ago, was
> not
> > published until less than six months ago, and has very low visibility.
> >
> >> You are right, it's not in the documentation. But if somebody asks on
> >> c.l.p the appropriate answer, I think, is to point to information such
> >> as the one above, and not the misleading "harmful" essay.
> >
> > According to Google, nobody has menctioned the "harmful" essay in this
> > group since April 2008 [1], months before Simionato's article were
> > available... So this is the *first* time the reference to the former
> essay
> > could have been replaced by M.S.' one... don't be so strict!
> >
> > Anyway, the right thing to do, IMHO, is to publish correct and accurate
> > documentation in the main Python site. Not everybody knows about this
> > group existence, nor has the time/experience/interest on subscribe here,
> > post a question and wait for an answer. I've seen some posts in
> python-dev
> > saying something like "this is confusing, we should evangelize people on
> > c.l.p. on the right way to do it" and I completely disagree; the right
> > place for such things is the product documentation, or -to a much lesser
> > degree because it's online only- some article collection linked from the
> > main site (like the "Other resources" left bar, already present).
> >
> >>>> Honestly, I don't understand how this thing got so much out of
> >>>> control. If anyone starts an intelligent question or remark about
> >>>> super, this essay is thrown in no matter what. Anyone can explain why?
> >>>
> >>> Because for a very loooooong time (seven years, 2001-2008) super was
> >>> almost undocumented. The Library Reference -before release 2.6- only
> >>> had a short paragraph, the [...]
> >>
> >> You are right, the documentation needs some work in this regard. But
> >> again, just because some sources are not in the documentation doesn't
> >> mean that the most opinionated essay is the best source. A little
> >> search turns up much more useful ones.
> >
> > (not according to Google [2]: I get the "harmful" article in the top, the
> > thread in python-dev, a couple threads in c.l.p including posts by M.S.,
> > his article in artima, and nothing more relevant than "Monty Python Super
> > Star" up to the 3rd page)
> >
> > *Now* that *I* am aware of the recent article series by M.S., the next
> > time someone asks *me* about super(), probably I'll refer her to both
> M.S.
> > and J.K.'s articles. Last time I checked (perhaps one or two years ago),
> > the "harmful" article was almost the only relevant source of info about
> > super().
> >
> > [1]
> >
> http://groups.google.com/group/comp.lang.python/search?q=super+harmful&start=0&scoring=d&
> > [2] http://www.google.com/search?q=python+super
>
> Okay, I think we converged to a common denominator. I agree with you
> that the documentation needs additions about super and I also agree
> with you that referring to both MS and JK articles is appropriate when
> a question about super comes up.
>
> It's good to have a discussion when views actually converge and not
> diverge at the end :)


Wait, that's not supposed to happen. This is Usenet after all. Quick,
someone comment on the GIL!

--
> Psss, psss, put it down! - http://www.cafepress.com/putitdown
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mark.seagoe at gmail.com  Tue Feb 10 21:31:26 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Tue, 10 Feb 2009 18:31:26 -0800 (PST)
Subject: Iterable Ctypes Struct
Message-ID: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>

I like the ability to access elements of a struct such as with ctypes
Structure:
>>>myStruct.elementName1
4

What I like about it is there are no quotes needed.

What I don't like about it is that it's not iterable:
>>>for n in myStruct:  <== gives error
>>>    print n

I don't want to force the end user to have preknowledge of the element
names.
Has anyone subclassed ctypes Structure based class to be iterable?
Before a noob starts trying to do this, is it possible?  How to
approach it?

Thx,
Mark


From grante at visi.com  Tue Feb 10 21:45:09 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 10 Feb 2009 20:45:09 -0600
Subject: pySerial help please!
References: <cf34ded9-987b-4237-9efb-5c74ad008cbd@j38g2000yqa.googlegroups.com>
Message-ID: <SYydnYvNmeMopg_UnZ2dnUVZ_h6dnZ2d@posted.usinternet>

On 2009-02-10, bmaschino at gmail.com <bmaschino at gmail.com> wrote:
> Hello all,
>
> I am very new to Python and I am using it because I needed an
> easy language to control a piece of equipment that connects to
> my computer via a serial cable. I am running Python 2.6 with
> pySerial 2.4 under Windows. I can get Python to create a
> serial port on COM1, but when I try to write to the device,
> nothing happens. Here is an example:
>
> import serial
> ser = serial.Serial(0)
> ser.write("otpm 2 16 0")
> ser.close()

Are you sure you don't need some sort of line-terminator (e.g
\r or \n) to tell the device to go ahead and execute the command?

> If I connect to the device in Hyperterminal the device will
> behave as expected when I give it the command 'otpm 2 16 0'
> but not in Python.

In Hyperterminal did you have to press [enter] to get the
command to execute?

If you close the port immediately after calling write(), it's
possible that the data never actually got sent.  You should
probably wait until the data has been sent before closing the
port.

If you're running on Unix, I you should be able to call
ser.flush() to wait until the output buffer has been sent.

However, I wouldn't count too heavily on the underlying Unix
serial driver properly implimenting the tcdrain call.  And, I
think the flush() call on Windows is a noop.  So, putting an
appropriate delay between the write and the close is probably
the safest thing to do.

-- 
Grant



From jervisau at gmail.com  Tue Feb 10 21:48:09 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 13:48:09 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <8e63a5ce0902101848k3e5be249n1892ba6c12588d4b@mail.gmail.com>

> I've done this:
>
> def _fact(n):
>    if n = 0: return 1
>    return _fact(n-1)*n
>
> def fact(n):
>    if n < 0: raise ValueError
>    return _fact(n)
>
> but that's ugly. What else can I do?
>
>
Hello, an idea is optional keyword arguments.

def fact(n, check=False):
  if not check:
    if n < 0: raise ValueError
  if n == 0: return 1
  return fact(n - 1, check=True) * n

essentially hiding an expensive check with a cheap one. It saves you
duplicating code in a separate function like in your example.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 21:57:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 00:57:27 -0200
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com>
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com>
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com>
	<op.uo39bsnex6zn5v@gabriel.sleipnir-bsas>
	<fbe2e2100902101201w58014f98j6b881601341c4fc0@mail.gmail.com>
	<op.uo5vl8l4x6zn5v@gabriel2.softlabbsas.com.ar>
	<fbe2e2100902101825l697ea5d9wc9bdc70660ae1256@mail.gmail.com>
	<ec96e1390902101831o49b619e8u4b5234397fd3c2d7@mail.gmail.com>
Message-ID: <op.uo52h1wix6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 00:31:06 -0200, Benjamin Kaplan  
<benjamin.kaplan at case.edu> escribi?:
> On Tue, Feb 10, 2009 at 9:25 PM, Daniel Fetchinson <
> fetchinson at googlemail.com> wrote:
>
>> Okay, I think we converged to a common denominator. I agree with you
>> that the documentation needs additions about super and I also agree
>> with you that referring to both MS and JK articles is appropriate when
>> a question about super comes up.
>>
>> It's good to have a discussion when views actually converge and not
>> diverge at the end :)
>
> Wait, that's not supposed to happen. This is Usenet after all. Quick,
> someone comment on the GIL!

Our resident trolls are sleeping, it seems...

-- 
Gabriel Genellina



From python at bdurham.com  Tue Feb 10 22:38:49 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 22:38:49 -0500
Subject: Difference between vars() and locals() and use case for vars()
Message-ID: <1234323529.11589.1299703567@webmail.messagingengine.com>

Can someone explain the difference between vars() and locals()?
I'm also trying to figure out what the use case is for vars(),
eg. when does it make sense to use vars() in a program?
Thank you,
Malcolm
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From gagsl-py2 at yahoo.com.ar  Tue Feb 10 23:04:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 02:04:47 -0200
Subject: Difference between vars() and locals() and use case for vars()
References: <1234323529.11589.1299703567@webmail.messagingengine.com>
Message-ID: <op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 01:38:49 -0200, <python at bdurham.com> escribi?:

> Can someone explain the difference between vars() and locals()?
> I'm also trying to figure out what the use case is for vars(),
> eg. when does it make sense to use vars() in a program?

Without arguments, vars() returns the current namespace -- same as  
locals() inside a function, same as locals() *and* globals() outside any  
function (i.e., in a module or running in the interactive interpreter)

With an argument (that is, vars(x)) it returns the names defined by the  
object itself; for "normal" class instances, that means its __dict__

It's useful in the interactive interpreter, to examine some object's  
contents. Maybe in other special cases. Certainly not in everyday's  
programming.

-- 
Gabriel Genellina



From python at bdurham.com  Tue Feb 10 23:10:35 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 10 Feb 2009 23:10:35 -0500
Subject: Difference between vars() and locals() and use case for vars()
In-Reply-To: <op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>
References: <1234323529.11589.1299703567@webmail.messagingengine.com>
	<op.uo55l92cx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <1234325435.17704.1299707517@webmail.messagingengine.com>

Thank you Gabriel!

Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 11 Feb 2009 02:04:47 -0200
Subject: Re: Difference between vars() and locals() and use case for
vars()

En Wed, 11 Feb 2009 01:38:49 -0200, <python at bdurham.com> escribi?:

> Can someone explain the difference between vars() and locals()?
> I'm also trying to figure out what the use case is for vars(),
> eg. when does it make sense to use vars() in a program?

Without arguments, vars() returns the current namespace -- same as  
locals() inside a function, same as locals() *and* globals() outside any 
function (i.e., in a module or running in the interactive interpreter)

With an argument (that is, vars(x)) it returns the names defined by the  
object itself; for "normal" class instances, that means its __dict__

It's useful in the interactive interpreter, to examine some object's  
contents. Maybe in other special cases. Certainly not in everyday's  
programming.

-- 
Gabriel Genellina

--
http://mail.python.org/mailman/listinfo/python-list


From lepto.python at gmail.com  Tue Feb 10 23:21:12 2009
From: lepto.python at gmail.com (oyster)
Date: Wed, 11 Feb 2009 12:21:12 +0800
Subject: can multi-core improve single funciton?
Message-ID: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>

Hi, guys, my fib(xx) is just an example to show "what is a single
function" and "what is the effect I expect to see when enable
multi-core".

My real purpose is to know "whether multi-core can help to improve the
speed of a common function". But I know definitely that the answer is
NO.


From gagsl-py2 at yahoo.com.ar  Tue Feb 10 23:31:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 02:31:16 -0200
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <op.uo56uek9x6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 23:58:07 -0200, Steven D'Aprano  
<steven at remove.this.cybersource.com.au> escribi?:

> I sometimes write recursive functions like this simple factorial:
>
>
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n
>
> At the risk of premature optimization, I wonder if there is an idiom for
> avoiding the unnecessary test for n <= 0 in the subsequent recursive
> calls? For the sake of the argument, let's pretend the test is expensive
> and I have a good reason for wanting to avoid it on subsequent calls :)
>
>
>
> I've done this:
>
> def _fact(n):
>     if n = 0: return 1
>     return _fact(n-1)*n
>
> def fact(n):
>     if n < 0: raise ValueError
>     return _fact(n)
>
> but that's ugly. What else can I do?

I don't think it's ugly; you have an implementation (_fact) and its public  
interfase (fact). In 'fact' you could check that n is actually an integer  
(an implicit precondition, your algorithm doesn't finish in other case)  
and whatever validation is also required. Perhaps its arguments come from  
user input and you need stricter tests, or convert from other type (like  
float->int).
On the other hand, '_fact' is private and you can assume their arguments  
are exactly what you require.
In Pascal I would have used a nested _fact function; in Python it isn't as  
efficient so I'd write it as your own example.

This is a rather used idiom - in the Python C API, by example, usually you  
see a public function PyFoo_DoSomething(PyObject* obj) and a private one  
_PyFoo_DoSomething(double x) (assume a function like sqrt, number ->  
float). The public one takes a generic Python object, checks its type,  
converts it to a C "double" value, and if all went OK, finally calls the  
private implementation passing that value.

-- 
Gabriel Genellina



From afriere at yahoo.co.uk  Tue Feb 10 23:42:47 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Tue, 10 Feb 2009 20:42:47 -0800 (PST)
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au> 
	<mailman.9300.1234320496.3487.python-list@python.org>
Message-ID: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>

On Feb 11, 1:48?pm, Jervis Whitley <jervi... at gmail.com> wrote:

> Hello, an idea is optional keyword arguments.
>
> def fact(n, check=False):
> ? if not check:
> ? ? if n < 0: raise ValueError
> ? if n == 0: return 1
> ? return fact(n - 1, check=True) * n
>
> essentially hiding an expensive check with a cheap one. It saves you
> duplicating code in a separate function like in your example.

Given the original read:

def fact(n):
    if n < 0: raise ValueError
    if n = 0: return 1
    return fact(n-1)*n

You've merely replaced the 'test n<0' with 'not check' at the expense
of an additional parameter that has to be passed each time (and the
additional test 'n<0' for the first iteration).


From michele.simionato at gmail.com  Tue Feb 10 23:52:37 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 10 Feb 2009 20:52:37 -0800 (PST)
Subject: "Super()" confusion
References: <fbe2e2100902091719n30f07ca7j9e8d0f628b0855f5@mail.gmail.com> 
	<20090210012739.12853.653428988.divmod.quotient.8083@henry.divmod.com> 
	<fbe2e2100902091734u74abb29fp57aadb5c0a2ef424@mail.gmail.com> 
	<mailman.9200.1234236604.3487.python-list@python.org>
	<2e105a22-dc21-4e69-b25d-522666c1db1c@u13g2000yqg.googlegroups.com>
	<mailman.9210.1234253991.3487.python-list@python.org>
Message-ID: <5175fb80-f01d-448f-99c7-ebbb60aa0011@a12g2000yqm.googlegroups.com>

On Feb 10, 9:19?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> You really should push them to be included in python.org, even in their ?
> unfinished form. (At least a link in the wiki pages). Their visibility is ?
> almost null now.

It looks like I made an unfortunate choice with the
title ("Things to Know about Super"). I have just changed
it to "Things to Know about *Python* Super" so that now
googling for "python super" should hopefully find them.

I agree that the real solution would be to publish on python.org, but
for that I have to write yet another paper about Python 3.0 super, cut
things about old version/bugs of Python, re-read the whole beast, and
convince the core developers to publish it (which is not automatic).
That is some work, and I have many other projects going on right now.
Truth is, discussions about super do not come out so often, and most
people don't care.

> They're very clearly written - I wish you had published them years ago!

Me too, but you know what happens when working for free and without
deadlines ;)

> again, you really should publish the ?
> series in a more prominent place.

Soon or later I will go back to super in Python 3.0, but now I am
working on my Scheme series, I have yet to translate two articles of
my "Mixins considered harmful" series, and I have at least two other
articles which has been waiting publication for more than one year.
Plus, I have a full time job ;)
But if you and others keep bugging me something may happen ...

               Michele Simionato


From prologic at shortcircuit.net.au  Tue Feb 10 23:57:26 2009
From: prologic at shortcircuit.net.au (James Mills)
Date: Wed, 11 Feb 2009 14:57:26 +1000
Subject: can multi-core improve single funciton?
In-Reply-To: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
References: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
Message-ID: <e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:21 PM, oyster <lepto.python at gmail.com> wrote:
> My real purpose is to know "whether multi-core can help to improve the
> speed of a common function". But I know definitely that the answer is
> NO.

As stated by others, and even myself,
it is not possible to just "automagically"
improve the execution speed of a single
function - let alone an application.

Your problem must be capable of being divided up
into work units that can be parallelized. If this is not
possible, multiple cores (no matter how many you have)
-will not- help you.

cheers
James


From clp2 at rebertia.com  Wed Feb 11 00:01:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 10 Feb 2009 21:01:53 -0800
Subject: can multi-core improve single funciton?
In-Reply-To: <e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>
References: <6a4f17690902102021g76f680cdve2cf20f16af5d8ab@mail.gmail.com>
	<e1a84d570902102057t64000d91wba5aded695b69e31@mail.gmail.com>
Message-ID: <50697b2c0902102101n4ff52d0fq8a6db73b9cbfb387@mail.gmail.com>

On Tue, Feb 10, 2009 at 8:57 PM, James Mills
<prologic at shortcircuit.net.au> wrote:
> On Wed, Feb 11, 2009 at 2:21 PM, oyster <lepto.python at gmail.com> wrote:
>> My real purpose is to know "whether multi-core can help to improve the
>> speed of a common function". But I know definitely that the answer is
>> NO.
>
> As stated by others, and even myself,
> it is not possible to just "automagically"
> improve the execution speed of a single
> function - let alone an application.
>
> Your problem must be capable of being divided up
> into work units that can be parallelized. If this is not
> possible, multiple cores (no matter how many you have)
> -will not- help you.

See also Amdahl's Law -- http://en.wikipedia.org/wiki/Amdahl%27s_law

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 00:07:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 03:07:31 -0200
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
	<1234301147.8528.47.camel@localhost.localdomain>
Message-ID: <op.uo58itxvx6zn5v@gabriel2.softlabbsas.com.ar>

On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:

>> The thing I don't understand is why a generator that has no iterable
>> values is different from an empty list. Why shouldn't bool ==
>> has_value?? Technically a list, a tuple, and a string are also objects
>> but if they lack values they're evaluated as False. It seems to me that
>> a generator is an object that intends to replace lists where lazy
>> evaluation would be more efficent. Here is one place where that's
>> definitely true.

Just in case it's not perfectly clear: until you call next() there is no  
way to know whether the generator will yield any value or not -- and once  
it does, it's lost until you explicitely save it.

This generator doesn't yield any value - but you have to wait for a while  
if you call .next() on it, until eventually raises StopIteration:
(x for x in xrange(2000000000) if x>100000000000)


En Tue, 10 Feb 2009 19:25:47 -0200, Albert Hopkins  
<marduk at letterboxes.org> escribi?:

>> The main reason I'm interested in this is that it improves performance
>> immensely over boolean evaluation of large lists (as the attached code
>> shows). It seems to me if I could use find a good use for it in my
>> experimentation that someone else might also want to do the same thing
>> in real-world code.
>
> I don't understand what you mean by this.  But if you really want to
> know if a generator is "non-empty":
>
> def non_empty(virgin_generator):
>     try:
>         virgin_generator.next() # note you just lost the first value
>         return True
>     except StopIteration:
>         return False
>
> The only way to get around this is to put all the values of a generator
> inside a container (e.g. a list):

For a long generator you may not want to do that, also you may not want to  
lose the next element. A variation of your function above is useful in  
such cases:

py> def end_of_gen(g):
...   """returns (False, next_element) when it exists or (True, None) when  
it's
empty"""
...   try: return False, g.next()
...   except StopIteration: return True, None
...
py> g = (c for c in "Python" if c in "aeiou")
py> eog, c = end_of_gen(g)
py> eog
False
py> c
'o'
py> eog, c = end_of_gen(g)
py> eog
True
py> c


-- 
Gabriel Genellina



From ntwrkd at gmail.com  Wed Feb 11 00:36:00 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 21:36:00 -0800
Subject: getopt
In-Reply-To: <e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
References: <mailman.9296.1234314769.3487.python-list@python.org>
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
Message-ID: <f257b9ab0902102136y5047e6b2y75ee57572162dee2@mail.gmail.com>

The documentation leaves lack for want, especially the examples.

On Tue, Feb 10, 2009 at 5:25 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 12:12 pm, Matthew Sacks <ntw... at gmail.com> wrote:
>> if anyone can have a look at this code and offer suggestions i would
>> appreciate it.
>> i am forced to use getopt, so i cant use something good like optparse
>>
>> passedArgs = sys.argv[1:]
>> optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
>
> Dunno where you acquired the str() ... just lose it. Consider checking
> with the documentation when something "does not work".
>
>> "adminServerURL=", "action=", "targets=", "appDir="])
>>
>> for some reason this does not work in assigning args to opts.
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From http  Wed Feb 11 00:51:00 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 21:51:00 -0800
Subject: can multi-core improve single funciton?
References: <mailman.9305.1234326077.3487.python-list@python.org>
Message-ID: <7xhc31o723.fsf@ruckus.brouhaha.com>

oyster <lepto.python at gmail.com> writes:
> Hi, guys, my fib(xx) is just an example to show "what is a single
> function" and "what is the effect I expect to see when enable
> multi-core".
> 
> My real purpose is to know "whether multi-core can help to improve
> the speed of a common function". But I know definitely that the
> answer is NO.

Well, it depends on the implementation.  Python isn't at the moment
designed for using multicores but as it evolves that may change.

The blog post http://cgi.cse.unsw.edu.au/~dons/blog/2007/11/29
may be of interest re parallelizing that fibonacci function.


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 00:52:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 03:52:56 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
Message-ID: <op.uo6amilsx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 00:31:26 -0200, <mark.seagoe at gmail.com> escribi?:

> I like the ability to access elements of a struct such as with ctypes
> Structure:
>>>> myStruct.elementName1
> 4
>
> What I like about it is there are no quotes needed.
>
> What I don't like about it is that it's not iterable:
>>>> for n in myStruct:  <== gives error
>>>>    print n
>
> I don't want to force the end user to have preknowledge of the element
> names.

Note that those names are available as the _fields_ class attribute

> Has anyone subclassed ctypes Structure based class to be iterable?
> Before a noob starts trying to do this, is it possible?  How to
> approach it?

The easiest way would be to define __getitem__ accepting index 0, 1, 2...  
until the last defined field.
See http://docs.python.org/reference/datamodel.html#object.__getitem__

<code>
 from ctypes import Structure

class IterableStructure(Structure):
   def __getitem__(self, i):
     if not isinstance(i, int):
       raise TypeError('subindices must be integers: %r' % i)
     return getattr(self, self._fields_[i][0])

</code>

This was tested as much as you see here:

py> from ctypes import c_int
py>
py> class POINT(IterableStructure):
...     _fields_ = [("x", c_int),
...                 ("y", c_int)]
...
py> point = POINT(10, 20)
py> print point.x, point.y
10 20
py> for field in point:
...   print field
...
10
20
py> print list(point)
[10, 20]

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Wed Feb 11 00:54:25 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 21:54:25 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
Message-ID: <531416d0-9396-4804-a5be-184c224edb60@d36g2000prf.googlegroups.com>

On Feb 11, 12:25?pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 11, 12:12?pm, Matthew Sacks <ntw... at gmail.com> wrote:
>
> > if anyone can have a look at this code and offer suggestions i would
> > appreciate it.
> > i am forced to use getopt, so i cant use something good like optparse
>
> > passedArgs = sys.argv[1:]
> > optlist, args = getopt.getopt(str(passedArgs), ["connectPassword=",
>
> Dunno where you acquired the str() ... just lose it. Consider checking
> with the documentation when something "does not work".

Rule 2: read further in the documentation than you think you need
to :-)

You have omitted the second arg, the one that defines short options.
As for the second part of your question, assigning to locals is
tedious as you have found. The classical solution is to jam the
options into an object that acts like a 'record' or a 'struct'.
Another possibility is the newfangled 'named tuple'. The following
illustrates working code for getting your optlist going, and using the
'record' idea. Keep on going (next step: add a function for each arg
that will convert the value from str to int/float/bool/etc as/if
appropriate) and you will have rewritten optparse.

HTH,
John

================
C:\junk>type getopt_demo.py
import getopt, sys
long_arg_defns = { # sets up defaults
    "cp":  None,
    "asu": "xyzzy",
    "act": "do_nothing",
    "tgts":"",
    "ad": 1.23,
}
long_arg_list = [x + '=' for x in long_arg_defns.keys()]
passedArgs = sys.argv[1:]
print 'passedArgs', passedArgs

print '\nattempt 1'
try:
    optlist, args = getopt.getopt(str(passedArgs), long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

print '\nattempt 2'
try:
    optlist, args = getopt.getopt(passedArgs, long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

print '\nattempt 3'
try:
    optlist, args = getopt.getopt(passedArgs, '', long_arg_list)
    print optlist, args
except Exception, e:
    print "%s: %s" % (e.__class__.__name__, e)

class Record(object):

    def __init__(self, initial_dict, optlist):
        for attr, default in initial_dict.items():
            setattr(self, attr, default)
        for attr, value in optlist:
            setattr(self, attr.lstrip('-'), value)

    def __str__(self):
        return "<Record: %s>" % self.__dict__

r = Record(long_arg_defns, optlist)
print
print r
print
print r.cp, r.act, r.ad


C:\junk>getopt_demo.py --cp xxxcp --ad yyyyyad extra1 extra2
passedArgs ['--cp', 'xxxcp', '--ad', 'yyyyyad', 'extra1', 'extra2']

attempt 1
[] ['--cp', 'xxxcp', '--ad', 'yyyyyad', 'extra1', 'extra2']

attempt 2
GetoptError: option --cp not recognized

attempt 3
[('--cp', 'xxxcp'), ('--ad', 'yyyyyad')] ['extra1', 'extra2']

<Record: {'tgts': '', 'cp': 'xxxcp', 'ad': 'yyyyyad', 'asu': 'xyzzy',
'act': 'do _nothing'}>

xxxcp do_nothing yyyyyad

C:\junk>


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 01:09:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 04:09:50 -0200
Subject: python3 tutorial for newbie
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
Message-ID: <op.uo6beobyx6zn5v@gabriel2.softlabbsas.com.ar>

En Tue, 10 Feb 2009 16:22:36 -0200, Gary Wood <pythonsky at sky.com> escribi?:

> Can someone recommend a good tutorial for Python 3, ideally that has  
> tasks or assignments at the end of each chapter.

I don't know of any specifically targetted to Python 3, except the  
official one at http://www.python.org/doc/3.0/

For the most part, any Python tutorial should be fine. Perhaps the only  
visible change (at the tutorial level) is that "print" became a function:

# 2.x syntax:
print "Hello", "world!"

# 3.x syntax:
print("Hello", "world!")

That said, Python 3.0 is so recent that isn't widely used yet, and many  
third party libraries aren't available for 3.0 at this moment. This  
certainly will change in the future, but in the meantime, perhaps you  
should stick to Python 2.6 for a while.

-- 
Gabriel Genellina



From sjmachin at lexicon.net  Wed Feb 11 01:36:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 10 Feb 2009 22:36:40 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com> 
	<mailman.9310.1234330563.3487.python-list@python.org>
Message-ID: <3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>

On Feb 11, 4:36?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> The documentation leaves lack for want, especially the examples.

You had two problems:

(1) str(passedArgs): The docs make it plain that "args" is a list, not
a str instance: """args is the argument list to be parsed, without the
leading reference to the running program. Typically, this means
sys.argv[1:]""". The 1st and 2nd examples spell out the same story;
here's the 2nd:
"""
 Using long option names is equally easy:
 >>> s = '--condition=foo --testing --output-file abc.def -x a1 a2'
 >>> args = s.split()
 >>> args
 ['--condition=foo', '--testing', '--output-file', 'abc.def', '-x',
'a1', 'a2']
"""

(2) omitting the *required* options arg: (a) it's not wrapped in [] so
it's required (b) the docs say """To accept only long options, options
should be an empty string."""

IOW, it may "leave lack for want", but not in the areas causing you a
bother.


From kamath86 at gmail.com  Wed Feb 11 01:37:37 2009
From: kamath86 at gmail.com (kamath86 at gmail.com)
Date: Tue, 10 Feb 2009 22:37:37 -0800 (PST)
Subject: Browse Dialog
Message-ID: <435cced2-53bc-47a1-86a9-b8ac9bb7415a@p13g2000yqc.googlegroups.com>

Hi ,

I am using TKinter for creating a GUI. As of now i am using
tkFileDialog module for selection of file/directory.But i see that i
can use either of these at one go.Is there a way i can select a file
or a directory through a single dialog box??


From arunasunil at gmail.com  Wed Feb 11 01:43:24 2009
From: arunasunil at gmail.com (arunasunil at gmail.com)
Date: Tue, 10 Feb 2009 22:43:24 -0800 (PST)
Subject: Programmatically changing network proxy settings on the Mac
Message-ID: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>

Hi,

Anybody have suggestions of how network proxy settings can be changed
programmatically on the Mac, Tiger and Leopard. Are there any helpful
python api's that can be used.

Thanks
Sunil


From akitada at gmail.com  Wed Feb 11 01:46:44 2009
From: akitada at gmail.com (Akira Kitada)
Date: Wed, 11 Feb 2009 15:46:44 +0900
Subject: python3 tutorial for newbie
In-Reply-To: <920577A6E319438A9397A41B74AE9913@Woodygar>
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
Message-ID: <90bb445a0902102246n65d1d33ej3f2ff0a1867253dc@mail.gmail.com>

http://wiki.python.org/moin/Python3.0Tutorials

On Wed, Feb 11, 2009 at 3:22 AM, Gary Wood <pythonsky at sky.com> wrote:
> Can someone recommend a good tutorial for Python 3, ideally that has tasks
> or assignments at the end of each chapter.
> Please,
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From ntwrkd at gmail.com  Wed Feb 11 01:46:48 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Tue, 10 Feb 2009 22:46:48 -0800
Subject: getopt
In-Reply-To: <3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
References: <mailman.9296.1234314769.3487.python-list@python.org>
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com>
	<mailman.9310.1234330563.3487.python-list@python.org>
	<3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902102246y3db0b6eco44cba9629c688d87@mail.gmail.com>

I didn't realize that the no-value arguments, -b, -h, etc are required?
This seems to make things a bit more difficult considering unless I
use the GNU style getopt all arguments are required to be passed?

I could be mistaken.

I will have a look at what you have posted here and report my results.
I appreciate the response.

M

On Tue, Feb 10, 2009 at 10:36 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 4:36 pm, Matthew Sacks <ntw... at gmail.com> wrote:
>> The documentation leaves lack for want, especially the examples.
>
> You had two problems:
>
> (1) str(passedArgs): The docs make it plain that "args" is a list, not
> a str instance: """args is the argument list to be parsed, without the
> leading reference to the running program. Typically, this means
> sys.argv[1:]""". The 1st and 2nd examples spell out the same story;
> here's the 2nd:
> """
>  Using long option names is equally easy:
>  >>> s = '--condition=foo --testing --output-file abc.def -x a1 a2'
>  >>> args = s.split()
>  >>> args
>  ['--condition=foo', '--testing', '--output-file', 'abc.def', '-x',
> 'a1', 'a2']
> """
>
> (2) omitting the *required* options arg: (a) it's not wrapped in [] so
> it's required (b) the docs say """To accept only long options, options
> should be an empty string."""
>
> IOW, it may "leave lack for want", but not in the areas causing you a
> bother.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From Scott.Daniels at Acm.Org  Wed Feb 11 01:57:18 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 10 Feb 2009 22:57:18 -0800
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <Rt6dnXPTkcLN6w_UnZ2dnUVZ_iyWnZ2d@pdx.net>

Steven D'Aprano wrote:
> I sometimes write recursive functions like this simple factorial:
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n 
> 
> At the risk of premature optimization, I wonder if there is an idiom for 
> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
> calls? For the sake of the argument, let's pretend the test is expensive 
> and I have a good reason for wanting to avoid it on subsequent calls :)
How about:

      def fact(n):
          if n < 2:
              if n < 0:
                  raise ValueError
              return 1
          return fact(n - 1) * n

But really, iteration is the solution to this, and avoiding the
right answer is a mistake.  I couldn't resist fixing your test
so you do one less layer of recursion.

--Scott David Daniels
Scott.Daniels at Acm.Org


From http  Wed Feb 11 02:41:18 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 23:41:18 -0800
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xeiy52zfl.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> def fact(n):
>     if n < 0: raise ValueError
>     if n = 0: return 1
>     return fact(n-1)*n 
> 
> At the risk of premature optimization, I wonder if there is an idiom for 
> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
> calls?

I'd write nested functions:

    def fact(n):
       if n < 0: raise ValueError
       def f1(n):
          return 1 if n==0 else n*f1(n-1)
       return f1(n)

If the language implementation supports tail recursion optimization
there's an accumulation-parameter style that takes a little getting
used to but is familiar in functional programming:

def fact(n):
    if n < 0: raise ValueError
    def f1(k,n):
       return k if n==0 else f1(k*n, n-1)
    return f1(1, n)

This won't do any good in CPython but maybe PyPy or Pyrex or whatever
can make use of it.  In this case the nested function is already
there, and the n<0 check naturally lifts out of it.


From http  Wed Feb 11 02:50:43 2009
From: http (Paul Rubin)
Date: 10 Feb 2009 23:50:43 -0800
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
Message-ID: <7xbpt9h0oc.fsf@ruckus.brouhaha.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
> I'd write nested functions:
> 
>     def fact(n):
>        if n < 0: raise ValueError
>        def f1(n):
>           return 1 if n==0 else n*f1(n-1)
>        return f1(n)

I forgot to add: all these versions except your original one should
add a type check if you are trying to program defensively.  Otherwise
they can recurse infinitely if you give a positive non-integer arg like
fact(3.5).


From joelc at cognyx.com  Wed Feb 11 02:52:40 2009
From: joelc at cognyx.com (Joel Ross)
Date: Wed, 11 Feb 2009 18:52:40 +1100
Subject: Variable + String Format
In-Reply-To: <019ff536$0$20657$c3e8da3@news.astraweb.com>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>
Message-ID: <01a1281b$0$7503$c3e8da3@news.astraweb.com>

Joel Ross wrote:
> Hi all,
> 
> I have this piece of code:
> #########################################################################
> 
> wordList = "/tmp/Wordlist"
> file = open(wordList, 'r+b')
> 
> 
> def readLines():
> 
>         for line in file.read():
>             if not line: break
>             print line + '.com '
>             return line
> 
> 
> 
> readLines()
> file.close()
> 
> ##########################################################################
> 
> It returns the results:
> 
> t.com
> 
> NOTE: Only returns the first letter of the first word on the first line 
> e.g. test would only print t and readline() does the same thing.
> 
> I have also tried readlines() which gives me the result:
> 
> test
> .com
> 
> The file Wordlist has one word on each line for example
> 
> test
> test1
> test2
> 
> I need it to loop though the Wordlist file and print/return the results
> 
> test.com
> test1.com
> test2.com
> 
> I'm just looking for a point in the right direction.
> 
> Much Thanks
> 
> JOelC


Thanks for the quick response guys. Help me out a alot. I'm a newbie to 
python and your replies help me understand a bit more about python!!

Thank You


From Ron.Barak at lsi.com  Wed Feb 11 02:58:59 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 11 Feb 2009 07:58:59 +0000
Subject: Putting asterisks around text
In-Reply-To: <20090209132046.091f5b8a.darcy@druid.net>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>

[http://www.emofaces.com/en/emoticons/t/thumbs-up-emoticon.gif]

-----Original Message-----
From: D'Arcy J.M. Cain [mailto:darcy at druid.net]
Sent: Monday, February 09, 2009 20:21
To: todpose at hotmail.com
Cc: python-list at python.org
Subject: Re: Putting asterisks around text

On Mon, 9 Feb 2009 10:09:26 -0800
"todpose at hotmail.com" <todpose at hotmail.com> wrote:
> I'm trying to write a program that puts asterisks around the input text using while loop.
> I can do this without using while loop, but how can you do that using
> while loop?Example:Enter a string: Hello world***********Hello
> world***********

while understand_problem is False:
    study("textbook")

complete("homework")

if want_help is True:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

--
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.

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From greg.ewing at canterbury.ac.nz  Wed Feb 11 03:10:04 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Wed, 11 Feb 2009 21:10:04 +1300
Subject: ANN: SuPy for Python 2.5 on Windows
Message-ID: <mailman.9324.1234351171.3487.python-announce-list@python.org>

SuPy 1.0 - Windows
------------------

A Windows build for Python 2.5 is now available.

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

This is a first version and is highly experimental. Let me
know if it works for you and whether you have any problems.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From sjmachin at lexicon.net  Wed Feb 11 03:13:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 00:13:33 -0800 (PST)
Subject: getopt
References: <mailman.9296.1234314769.3487.python-list@python.org> 
	<e1d4fee8-1986-4c8e-8754-935e3e4be034@y38g2000prg.googlegroups.com> 
	<mailman.9310.1234330563.3487.python-list@python.org>
	<3997cad4-e578-4e58-9c93-4c134b1d6d1a@v5g2000pre.googlegroups.com>
	<mailman.9314.1234334818.3487.python-list@python.org>
Message-ID: <6f4e83b3-7c0f-4572-868f-7dafd769a3d3@r15g2000prd.googlegroups.com>

On Feb 11, 5:46?pm, Matthew Sacks <ntw... at gmail.com> wrote:
> I didn't realize that the no-value arguments, -b, -h, etc are required?

required sense 1: the 2nd arg of the function is required; if there
are to be no short options, the 2nd arg should be an empty string.

required sense 2: you are required to specify *all* short options that
you will accept, whether they are no-value or value options; otherwise
you would have to do your own checking for unacceptable options

> This seems to make things a bit more difficult considering unless I
> use the GNU style getopt all arguments are required to be passed?

What does "all arguments are required to be passed" mean? The user is
not required to supply an arg corresponding to any option. Options are
optional!

GNU? Change getopt.getopt to getopt.gnu_getopt and you still get an
exception like "GetoptError: option -b not recognized" if -b is not
defined in the 2nd arg of [gnu_]getopt. AFAICT the GNU difference is
only the documented different treatment of an arg string like "-a1 -b
bvalue stray -c -d" ... non-Gnu treats -c and -d the same as stray.

> I will have a look at what you have posted here and report my results.

Just bear in mind that it was written under the assumption that you
weren't plannning to use short options at all; your examples left lack
for want.

Cheers,
John


From lists at cheimes.de  Wed Feb 11 03:26:31 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 11 Feb 2009 09:26:31 +0100
Subject: Escaping my own chroot...
In-Reply-To: <muednbIYVNVU-w_UnZ2dnUVZ_q3inZ2d@earthlink.com>
References: <gmt446$fq0$1@aioe.org>
	<muednbIYVNVU-w_UnZ2dnUVZ_q3inZ2d@earthlink.com>
Message-ID: <49928BB7.2020406@cheimes.de>

Dennis Lee Bieber schrieb:
> 	That's the whole purpose of chroot()... As far as the process is
> concerned, the chroot() path is now the top of the file system, so there
> is no where above it you can get to...

Yes, you can get with some hacks.

> chroot() is meant for cases where one may be running a server or such
> that should not permit any outside hacks from reaching above its level.
> Typically one creates a minimal environment of just those commands and
> programs needed by users of the server -- you remove anything that
> offers privileged ability.
> 
> chdir() would be used to change the current directory of the process, so
> any spawned commands would operate in the new directory by default

chroot() must not be understood as a security mechanism like BSD's jail.
   A process can still access resources outside the chroot. Unless the
process drops it's root privileges with setuid() ASAP the process can
escape the chroot'ed environment, too.

chroot() can help with increasing security but it's not bullet proof. By
the way it's a bad idea to mount proc and sys inside a chroot ...

Christian


From castironpi at gmail.com  Wed Feb 11 03:41:39 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 11 Feb 2009 00:41:39 -0800 (PST)
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <d9c70507-f0ea-46da-bdca-e2170210e970@r15g2000prh.googlegroups.com>

On Feb 10, 7:58?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> I sometimes write recursive functions like this simple factorial:
>
> def fact(n):
> ? ? if n < 0: raise ValueError
> ? ? if n = 0: return 1
> ? ? return fact(n-1)*n
>
> At the risk of premature optimization, I wonder if there is an idiom for
> avoiding the unnecessary test for n <= 0 in the subsequent recursive
> calls? For the sake of the argument, let's pretend the test is expensive
> and I have a good reason for wanting to avoid it on subsequent calls :)
>
> I've done this:
>
> def _fact(n):
> ? ? if n = 0: return 1
> ? ? return _fact(n-1)*n
>
> def fact(n):
> ? ? if n < 0: raise ValueError
> ? ? return _fact(n)
>
> but that's ugly. What else can I do?
>
> --
> Steven

Build a list of function calls, and just replace the base case with a
terminating call.

>>> def f( n ):
...     def rec( i ):
...             return i* funcs[ i- 1 ]( i- 1 )
...     def base( i ):
...             return 1
...     funcs= [ rec ]* n
...     funcs[ 0 ]= base
...     return rec( n )
...
>>> f( 5 )
120
>>> f( 6 )
720
>>> f( 1 )
1


From ksterling at mindspring.com  Wed Feb 11 04:10:31 2009
From: ksterling at mindspring.com (Ken)
Date: Wed, 11 Feb 2009 04:10:31 -0500
Subject: python3 tutorial for newbie
References: <920577A6E319438A9397A41B74AE9913@Woodygar>
	<mailman.9312.1234332608.3487.python-list@python.org>
Message-ID: <9f-dnVeRM-SVCw_UnZ2dnUVZ_v7inZ2d@earthlink.com>


"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote in message 
news:mailman.9312.1234332608.3487.python-list at python.org...
> En Tue, 10 Feb 2009 16:22:36 -0200, Gary Wood <pythonsky at sky.com> 
> escribi?:
>
>> Can someone recommend a good tutorial for Python 3, ideally that has 
>> tasks or assignments at the end of each chapter.
>
> I don't know of any specifically targetted to Python 3, except the 
> official one at http://www.python.org/doc/3.0/
>
> For the most part, any Python tutorial should be fine. Perhaps the only 
> visible change (at the tutorial level) is that "print" became a function:
>
> # 2.x syntax:
> print "Hello", "world!"
>
> # 3.x syntax:
> print("Hello", "world!")
>
> That said, Python 3.0 is so recent that isn't widely used yet, and many 
> third party libraries aren't available for 3.0 at this moment. This 
> certainly will change in the future, but in the meantime, perhaps you 
> should stick to Python 2.6 for a while.
>
> -- 
> Gabriel Genellina

Several links here:

http://wiki.python.org/moin/Python3.0Tutorials
> 




From jef.mangelschots at gmail.com  Wed Feb 11 04:24:17 2009
From: jef.mangelschots at gmail.com (jefm)
Date: Wed, 11 Feb 2009 01:24:17 -0800 (PST)
Subject: import wx works interactive but not from script
References: <549b9ca1-90f4-403e-b30d-679957f36992@a12g2000pro.googlegroups.com>
	<mailman.9215.1234257018.3487.python-list@python.org>
	<35efb288-f6eb-4077-8414-93fa673c6878@t26g2000prh.googlegroups.com>
	<mailman.9241.1234283966.3487.python-list@python.org>
Message-ID: <0a313a42-bfd9-4f2e-b16c-ffb82d3ae2a1@o2g2000prl.googlegroups.com>

ok, sorry for the long wait.
I tried this on both my work (XP) and home PC (Vista64) and they are
both consistent.

I had both Python2.6 and Python 3.0 installed.
wxPython didn't like that.
As soon as I uninstalled Python3.0, my wxPython started running again.
Must be some kind of registry thing.

Thanks for the suggestion.


From tjreedy at udel.edu  Wed Feb 11 04:31:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 04:31:10 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <7xeiy52zfl.fsf@ruckus.brouhaha.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
Message-ID: <gmu5sr$t8q$1@ger.gmane.org>


> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>> def fact(n):
>>     if n < 0: raise ValueError
>>     if n = 0: return 1
>>     return fact(n-1)*n 
>>
>> At the risk of premature optimization, I wonder if there is an idiom for 
>> avoiding the unnecessary test for n <= 0 in the subsequent recursive 
>> calls?

Reverse the test order

def fact(n):
     if n > 0: return fact(n-1)*n
     if n == 0: return 1
     raise ValueError

You must test recursive versus terminal case every call in any case.
Nearly always, the first test passes and second is not done.
You only test n==0 once, either to terminate or raise exception.
This works for any integral value and catches non-integral values. 
(There is some delay for that, but only bad calls are penalized.)

Terry Jan Reedy



From jervisau at gmail.com  Wed Feb 11 04:31:25 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 20:31:25 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<mailman.9300.1234320496.3487.python-list@python.org>
	<a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
Message-ID: <8e63a5ce0902110131m78a996f0l62df13e602489cd0@mail.gmail.com>

> You've merely replaced the 'test n<0' with 'not check' at the expense
> of an additional parameter that has to be passed each time (and the
> additional test 'n<0' for the first iteration).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
I think you have missed the point. The OP stated that n<0 could stand
for an expensive
operation, this replaces an expensive check every time with a cheaper
one every time.

I like the idea of the interface that was in the original post.

Cheers,


From jervisau at gmail.com  Wed Feb 11 04:32:44 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 11 Feb 2009 20:32:44 +1100
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<mailman.9300.1234320496.3487.python-list@python.org>
	<a3738e31-f704-4323-b8d3-617f0cf67e1d@t39g2000prh.googlegroups.com>
Message-ID: <8e63a5ce0902110132l6c092d1eyc4068e381f3c0069@mail.gmail.com>

>
> You've merely replaced the 'test n<0' with 'not check' at the expense
> of an additional parameter that has to be passed each time (and the
> additional test 'n<0' for the first iteration).
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I think you have missed the point. The OP stated that n<0 could stand
for an expensive
operation, this replaces an expensive check every time with a cheaper
one every time.

I like the idea of the interface that was in the original post.

Cheers,


From Scott.Daniels at Acm.Org  Wed Feb 11 04:43:43 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 01:43:43 -0800
Subject: zlib interface semi-broken
In-Reply-To: <mailman.9287.1234307540.3487.python-list@python.org>
References: <mailman.9266.1234299464.3487.python-list@python.org>	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
Message-ID: <Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>

Travis wrote:
> On Tue, Feb 10, 2009 at 01:36:21PM -0800, Scott David Daniels wrote:
>> .... I personally would like it and bz2 to get closer to each other...
> 
> Well, I like this idea; perhaps this is a good time to discuss the
> equivalent of some "abstract base classes", or "interfaces", for
> compression.
> 
> As I see it, the fundamental abstractions are the stream-oriented
> de/compression routines.  Given those, one should easily be able to
> implement one-shot de/compression of strings.  In fact, that is the
> way that zlib is implemented; the base functions are the
> stream-oriented ones and there is a layer on top of convenience
> functions that do one-shot compression and decompression.

There are a couple of things here to think about.  I've wanted to
do some low-level (C-coded) search w/o bothering to create strings
until a match.  I've no idea how to push this down in, but I may be
looking for a nice low-level spot to fit.  Characteristics for that
could be read-only access to small expansion parts w/o copying them
out.  Also, in case of a match, a (relatively quick) way to mark points
as we proceed and a (possibly slower) way to resrore from one or
more marked points.

Also, another programmer wants to parallelize _large_ bzip file
expansion by expanding independent blocks in separate threads (we
know how to find safe start points).  To get such code to work, we
need to find big chunks of computation, and (at least optionally)
surround them with GIL release points.

> So what I suggest is a common framework of three APIs; a sequential
> compression/decompression API for streams, a layer (potentially
> generic) on top of those for strings/buffers, and a third API for
> file-like access.  Presumably the file-like access can be implemented
> on top of the sequential API as well.
If we have to be able to start from arbitrary points in bzip files, they
have one nasty characteristic: they are bit-serial, and we'll need to
start them at arbitrary _bit_ points (not simply byte boundaries).

One structure I have used for searching is a result iterator fed by
a source iterator, so rather than a read w/ inconvenient boundaries
the input side of the thing calls the 'next' method of the provided
source.

> ... I would rather see a pythonic interface to the libraries than a
 > simple-as-can-be wrapper around the C functions....
I'm on board with you here.

> My further suggestion is that we start with the sequential
> de/compression, since it seems like a fundamental primitive.
> De/compressing strings will be trivial, and the file-like interface is
> already described by Python.
Well, to be explicit, are we talking about Decompresion and Compression
simultaneously or do we want to start with one of them first?

> 2) The de/compression object has routines for reading de/compressed
> data and states such as end-of-stream or resynchronization points as
> exceptions, much like the file class can throw EOFError.  My problem
> with this is that client code has to be cognizant of the possible
> exceptions that might be thrown, and so one cannot easily add new
> exceptions should the need arise.  For example, if we add an exception
> to indicate a possible resynchronization point, client code may not
> be capable of handling it as a non-fatal exception.

Seems like we may want to say things like, "synchronization points are
too be silently ignored."

--Scott David Daniels
Scott.Daniels at Acm.Org


From robince at gmail.com  Wed Feb 11 04:50:04 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 01:50:04 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
Message-ID: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>

Hi,

I am building some computational web services using soaplib. This
creates a WSGI application.

However, since some of these services are computationally intensive,
and may be long running, I was looking for a way to use multiple
processes. I thought about using multiprocessing.Process manually in
the service, but I was a bit worried about how that might interact
with a threaded server (I was hoping the thread serving that request
could just wait until the child is finished). Also it would be good to
keep the services as simple as possible so it's easier for people to
write them.

I have at the moment the following WSGI structure:
TransLogger(URLMap(URLParser(soaplib objects)))
although presumably, due to the beauty of WSGI, this shouldn't matter.

As I've found with all web-related Python stuff, I'm overwhelmed by
the choice and number of alternatives. I've so far been using cherrypy
and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
What would be the simplest [quickest to setup and fewest details of
the server required - ideally with a simple example] and most reliable
[this will eventually be 'in production' as part of a large scientific
project] way to host this sort of WSGI with a process-per-request
style?

Thanks!

Robin



From thorsten at thorstenkampe.de  Wed Feb 11 04:55:01 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 11 Feb 2009 10:55:01 +0100
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
Message-ID: <MPG.23fcbee11990ceb19897c0@news.individual.de>

* Richard Gruet (Tue, 10 Feb 2009 20:38:24 +0100)
> The Python 2.6 Quick Reference is available in HTML and PDF formats at
> http://rgruet.free.fr/#QuickRef.

THANK YOU!

Thorsten


From ramesh.nrk at gmail.com  Wed Feb 11 04:56:19 2009
From: ramesh.nrk at gmail.com (nRk)
Date: Wed, 11 Feb 2009 01:56:19 -0800 (PST)
Subject: urllib2.Request:: http Request sending successfully, but Response 
	contains in valid data.
Message-ID: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>

Hi

I am trying to send Data to a website through "http" using
"urllib.request" library using the bellow code.
Response status code contains. 200 (OK) but Response contains
nothing...

With same data When I test using C# it working fine.. Response
having.. some data in xml format.
But I am using below python code i am getting response only "<HTML></
HTML>".

Is there any in my code..

 req  = urllib2.Request(url) // url is valid url
 req.add_header('Authorization','AuthSub token="xxxxxxxxxxxxx"')
 req.add_header('Content-Type','application/atom+xml')
 req.data=data  // data is having valid xml data
 r = urllib2.urlopen(req)

print(r.code) // output 200
print(r.msg) // output OK
print(r.read()) //<HTML></HTML>


From andrew at acooke.org  Wed Feb 11 04:58:54 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 06:58:54 -0300 (CLST)
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <gmu5sr$t8q$1@ger.gmane.org>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com> <gmu5sr$t8q$1@ger.gmane.org>
Message-ID: <1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>

Terry Reedy wrote:
> Reverse the test order
>
> def fact(n):
>      if n > 0: return fact(n-1)*n
>      if n == 0: return 1
>      raise ValueError

sweet!  but is this generally possible?  ie: did you think this up for
this question or is it an idiom that you find yourself using often?

andrew



From piet at cs.uu.nl  Wed Feb 11 05:12:06 2009
From: piet at cs.uu.nl (Piet van Oostrum)
Date: Wed, 11 Feb 2009 11:12:06 +0100
Subject: Distributing simple tasks
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804C00A8C@jermail1.atomant.net>
Message-ID: <m2r625uvt5.fsf@cp1336376-a.venlo1.lb.home.nl>

Noam Aigerman wrote:
> Hi,
> 
> Suppose I have an array of functions which I execute in threads (each
> thread get a slice of the array, iterates over it and executes each
> function in it?s slice one after the other). Now I want to distribute
> these tasks between two machines, i.e give each machine half of the
> slices and let it run them in threads as described above. Is there an
> easy way, or an article on this matter you can point me to?

Have a look at MapReduce (google for MapReduce Python).
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org


From http  Wed Feb 11 05:17:20 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 02:17:20 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
Message-ID: <7xskml9t1r.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> Seems like we may want to say things like, "synchronization points are
> too be silently ignored."

That would completely break some useful possible applications, so should
be avoided.


From greg at cosc.canterbury.ac.nz  Wed Feb 11 05:41:22 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Wed, 11 Feb 2009 23:41:22 +1300
Subject: generator object or 'send' method?
In-Reply-To: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
Message-ID: <6vfo6kFjlnteU1@mid.individual.net>

Aaron Brady wrote:

> It would receive the 'send' from a different point in control
> flow than its usual 'next'.  Should it repeat a value if it receives a
> 'send'?

No. This requirement clearly indicates that send() is
the wrong tool for the job.

I would use a class with a generator as a method, e.g.

   class Multiples:

     m = 1

     def set_multiplier(self, m):
       self.m = m

     def generate(self, limit):
       for i in xrange(limit):
         yield i * self.m

   g = Multiples()
   for x in g.generate(10):
     print x
     if x == 3:
       g.set_multiplier(42)

produces

0
1
2
3
168
210
252
294
336
378

-- 
Greg


From christopher.saunter at durham.ac.uk  Wed Feb 11 06:06:31 2009
From: christopher.saunter at durham.ac.uk (c d saunter)
Date: Wed, 11 Feb 2009 11:06:31 +0000 (UTC)
Subject: Unexpected string behaviour: txt = 'this' ' works'
Message-ID: <gmubfn$a28$1@heffalump.dur.ac.uk>

I did a double take when debugging an error the other day.  My
problem was missing out a comma when building a list of strings.

Much to my surprise the offending code still executed to cause
problems later on:

>>> txt = 'this', 'works'
>>> print txt
('this', 'works')
# As expected
>>> txt = 'this' 'works'
>>> print txt
thisworks
# Eh?

I have never seen this behaviour before, but it works in Python 2.2.1
and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
of the compiler.

Any thoughts?
Regards
Chris





From qgallet at gmail.com  Wed Feb 11 06:21:29 2009
From: qgallet at gmail.com (Quentin Gallet-Gilles)
Date: Wed, 11 Feb 2009 12:21:29 +0100
Subject: Unexpected string behaviour: txt = 'this' ' works'
In-Reply-To: <gmubfn$a28$1@heffalump.dur.ac.uk>
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <8b943f2b0902110321t40b44567l8050968534787955@mail.gmail.com>

*Literal* string concatenation has always been a part of Python :
http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation


On Wed, Feb 11, 2009 at 12:06 PM, c d saunter <
christopher.saunter at durham.ac.uk> wrote:

> I did a double take when debugging an error the other day.  My
> problem was missing out a comma when building a list of strings.
>
> Much to my surprise the offending code still executed to cause
> problems later on:
>
> >>> txt = 'this', 'works'
> >>> print txt
> ('this', 'works')
> # As expected
> >>> txt = 'this' 'works'
> >>> print txt
> thisworks
> # Eh?
>
> I have never seen this behaviour before, but it works in Python 2.2.1
> and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
> of the compiler.
>
> Any thoughts?
> Regards
> Chris
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From greg at cosc.canterbury.ac.nz  Wed Feb 11 06:23:39 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 12 Feb 2009 00:23:39 +1300
Subject: python is great
In-Reply-To: <495fd1f5$0$18383$ba4acef3@news.orange.fr>
References: <14fa3ad88c5cff33fb4e81deb89ba835@dizum.com>
	<495fd1f5$0$18383$ba4acef3@news.orange.fr>
Message-ID: <6vfqlqFjnknkU1@mid.individual.net>

>> python is great.
> 
> No.
> 
> Python is VERY GREAT !!!!!!!

All right now, everyone...

   Every Python's sacred, every Python's great,
   If any Python's wasted, Guido gets irate!

-- 
Greg


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 11 06:23:57 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 11 Feb 2009 12:23:57 +0100
Subject: Unexpected string behaviour: txt = 'this' ' works'
In-Reply-To: <gmubfn$a28$1@heffalump.dur.ac.uk>
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <4992b53f$0$3507$426a74cc@news.free.fr>

c d saunter a ?crit :
> I did a double take when debugging an error the other day.  My
> problem was missing out a comma when building a list of strings.
> 
> Much to my surprise the offending code still executed to cause
> problems later on:
> 
>>>> txt = 'this', 'works'
>>>> print txt
> ('this', 'works')
> # As expected
>>>> txt = 'this' 'works'
>>>> print txt
> thisworks
> # Eh?
>
> I have never seen this behaviour before, but it works in Python 2.2.1
> and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
> of the compiler.
> 
> Any thoughts?

http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation


From christopher.saunter at durham.ac.uk  Wed Feb 11 06:26:36 2009
From: christopher.saunter at durham.ac.uk (c d saunter)
Date: Wed, 11 Feb 2009 11:26:36 +0000 (UTC)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<4992b53f$0$3507$426a74cc@news.free.fr>
Message-ID: <gmuclc$alg$1@heffalump.dur.ac.uk>

Bruno Desthuilliers (bruno.42.desthuilliers at websiteburo.invalid) wrote:
: c d saunter a ?crit :
: > I did a double take when debugging an error the other day.  My
: > problem was missing out a comma when building a list of strings.
: > 
: > Much to my surprise the offending code still executed to cause
: > problems later on:
: > 
: >>>> txt = 'this', 'works'
: >>>> print txt
: > ('this', 'works')
: > # As expected
: >>>> txt = 'this' 'works'
: >>>> print txt
: > thisworks
: > # Eh?
: >
: > I have never seen this behaviour before, but it works in Python 2.2.1
: > and 2.5.4 so I guess it's meant to be there.  I assume it is a feature
: > of the compiler.
: > 
: > Any thoughts?

: http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation

Ahh.  Thanks.

Chris


From robin at reportlab.com  Wed Feb 11 07:10:47 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 12:10:47 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
Message-ID: <4992C047.3060306@chamonix.reportlab.co.uk>

Robin wrote:
> Hi,
> 
> I am building some computational web services using soaplib. This
> creates a WSGI application.
> 
> However, since some of these services are computationally intensive,
> and may be long running, I was looking for a way to use multiple
> processes. I thought about using multiprocessing.Process manually in
> the service, but I was a bit worried about how that might interact
> with a threaded server (I was hoping the thread serving that request
> could just wait until the child is finished). Also it would be good to
> keep the services as simple as possible so it's easier for people to
> write them.
> 
> I have at the moment the following WSGI structure:
> TransLogger(URLMap(URLParser(soaplib objects)))
> although presumably, due to the beauty of WSGI, this shouldn't matter.
> 
> As I've found with all web-related Python stuff, I'm overwhelmed by
> the choice and number of alternatives. I've so far been using cherrypy
> and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> What would be the simplest [quickest to setup and fewest details of
> the server required - ideally with a simple example] and most reliable
> [this will eventually be 'in production' as part of a large scientific
> project] way to host this sort of WSGI with a process-per-request
> style?
> 
>......

We've used forked fastcgi (flup) with success as that decouples the wsgi process 
(in our case django) from the main server (in our case apache). Our reasons for 
doing that were to allow the backend to use modern pythons without having to 
upgrade the server (which is required if using say mod_python). The wsgi process 
runs as an ordinary user which eases some tasks.

A disadvantage of our scheme is that long running processes may cause problems 
eg timeouts. In practice since there are no guarantees for how long an http 
connection will hold up (because of proxies etc etc) we decided to work around 
this problem. Basically long running jobs go into a task queue on the server and 
the response is used to reconnect to the long running job peridically for status 
querying/results etc etc.
-- 
Robin Becker



From bearophileHUGS at lycos.com  Wed Feb 11 07:16:03 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 11 Feb 2009 04:16:03 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
Message-ID: <f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>

christopher.saun... at durham.ac.uk (c d saunter):

>I assume it is a feature of the compiler.<

Yes it's a bug-prone antifeature that's probably a relic from C that
doesn't have a concatenation operator among strings as Python does
(+). So in Python it saves you to use + at the cost of possible bugs.

Bye,
bearophile


From joelc at cognyx.com  Wed Feb 11 07:32:16 2009
From: joelc at cognyx.com (Joel Ross)
Date: Wed, 11 Feb 2009 23:32:16 +1100
Subject: Variable + String Format
In-Reply-To: <pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>
References: <019ff536$0$20657$c3e8da3@news.astraweb.com>	<01a1281b$0$7503$c3e8da3@news.astraweb.com>
	<pan.2009.02.10.08.12.30@REMOVE.THIS.cybersource.com.au>
Message-ID: <01a169a2$0$23675$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:
> On Wed, 11 Feb 2009 18:52:40 +1100, Joel Ross wrote:
> 
>> Thanks for the quick response guys. Help me out a alot. I'm a newbie to
>> python and your replies help me understand a bit more about python!!
> 
> Joel, unless you have Guido's time machine and are actually posting from 
> the future, the clock, or possibly the time zone, on your PC is set 
> wrong. 
> 
> 
I'm from the distant future. Too protect and Serve humankind!!!

lol thanks dude. I'm a day ahead of myself. I had my linux box running 
off UTC and it didn't include daylight savings so I adjusted it myself, 
must have accidentally changed the day as well :).


From benjamin.kaplan at case.edu  Wed Feb 11 08:23:41 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 08:23:41 -0500
Subject: cannot install
In-Reply-To: <9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
	<ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>
	<5929AA4E-C3C7-42FE-93B0-6D1F11932B73@volny.cz>
	<ec96e1390902100535p7075ce98kf8ef72f8251f7b2a@mail.gmail.com>
	<9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
Message-ID: <ec96e1390902110523u7cf76a01k738d535533bc10c7@mail.gmail.com>

2009/2/11 administrator <vzupka at volny.cz>

> I tried as admin with Python-3.0 in my home directory but no success yet.
> Is there another help?
>
> Macintosh:~ admin$ export
> PATH=/opt/local/bin:/opt/local/sbin:/Developer/usr/bin:$PATH
> Macintosh:~ admin$ echo $PATH
>
> /opt/local/bin:/opt/local/sbin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/admin:/usr/local/bin:/usr/X11/bin
> Macintosh:~ admin$ cd ~/Python-3.0
> Macintosh:Python-3.0 admin$ pwd
> /Users/admin/Python-3.0
> Macintosh:Python-3.0 admin$ sudo ./configure --enable-framework
> checking for --with-universal-archs... 32-bit
> checking MACHDEP... darwin
> checking machine type as reported by uname -m... i386
> checking for --without-gcc... no
> checking for gcc... gcc
> checking for C compiler default output file name...
> *configure: error: C compiler cannot create executables*
> See `config.log' for more details.
> Macintosh:Python-3.0 admin$
>



What does config.log say?


>
>
> Regards, Vladimir Zupka
>
> On 10.2.2009, at 14:35, Benjamin Kaplan wrote:
>
>
>
> On Tue, Feb 10, 2009 at 4:07 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:
>
>> I tried this:
>> PATH=$PATH:/Developer/usr/bin
>> echo $PATH
>> cd /Python-3.0
>> ./configure --enable-framework
>> make
>> sudo make install
>>
>> and the result is:
>>
>> Macintosh:~ vzupka$ /Users/vzupka/Desktop/Python.sh ; exit;
>>
>> /Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/Developer/usr/bin
>> checking for --with-universal-archs... 32-bit
>> checking MACHDEP... darwin
>> checking machine type as reported by uname -m... i386
>> checking for --without-gcc... no
>> checking for gcc... gcc
>> checking for C compiler default output file name...
>> *configure: error: C compiler cannot create executables*
>> *See `config.log' for more details.*
>> make: *** No targets specified and no makefile found.  Stop.
>>
>> WARNING: Improper use of the sudo command could lead to data loss
>> or the deletion of important system files. Please double-check your
>> typing when using sudo. Type "man sudo" for more information.
>>
>> To proceed, enter your password, or type Ctrl-C to abort.
>>
>> Password:
>> logout
>>
>> [Process completed]
>>
>> What is wrong with C compiler? Where do I find the 'config.log'?
>>
>
>
> config.log should be in Python-3.0. I believe that you have a permissions
> problem. ./configure needs to generate the makefiles that tell the compiler
> what to do and then the make command will create the executables. Since
> you're not in your home directory, you (as a standard user) don't have
> permission to write to that directory. Either move Python-3.0 to somewhere
> that you have write permissions or use sudo for the whole script.
>
>
>
> Vladimir Zupka
>>
>> On 9.2.2009, at 16:56, Benjamin Kaplan wrote:
>>
>>
>>
>> On Mon, Feb 9, 2009 at 9:05 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:
>>
>>> I have Mac OS X Leopard 10.5.6 and I downloaded and unpacked Python 3.0
>>> into a folder (/Library/Frameworks/Python.framework) and ran commands:
>>>
>>> cd /Library/Frameworks/Python.framework/Python-3.0
>>> python setup.py install
>>>
>>> and got the message reporting a syntax error:
>>>
>>> Macintosh:~ vzupka$ /bin/csh
>>> [Macintosh:~] vzupka% cd /Library/Frameworks/Python.framework/Python-3.0
>>> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka% python
>>> setup.py install
>>>   File "setup.py", line 232
>>>     except (CCompilerError, DistutilsError) as why:
>>>                                              ^
>>> SyntaxError: invalid syntax
>>> [Macintosh:Frameworks/Python.framework/Python-3.0] vzupka%
>>>
>>>
>>>
>>
>> You can't use setup.py because the python 2.5 on your system (or 2.6 if
>> you installed it) is incompatible with Python 3 modules. You need to compile
>> Python 3 yourself. It will then automatically call setup.py to create all
>> the extension modules.
>>
>> Just unpack the tarball anywhere and use the following commands  Python 3
>> is automatically installed as python3.0, so you don't need to worry about
>> overwriting the default python on the system.
>>
>> ./configure --enable-framework
>> make
>> sudo make install
>>
>> more complete instructions are in the Mac/README file, except substitute
>> "Python 3.0" everywhere it says "MacPython 2.6". You will probably need to
>> install a whole bunch of packages to compile it. configure will tell you
>> about them. MacPorts (www.macports.org) and fink (www.finkproject.org)
>> provide an easy way to get them.
>>
>>
>>> Regards,
>>>  Vladim?r ?upka
>>> vzupka at volny.cz
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>>  Vladim?r ?upka
>> vzupka at volny.cz
>>
>>
>>
>>
>>
>>
>
>
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From robince at gmail.com  Wed Feb 11 08:28:01 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 05:28:01 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
Message-ID: <e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>

On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
> We've used forked fastcgi (flup) with success as that decouples the wsgi process
> (in our case django) from the main server (in our case apache). Our reasons for
> doing that were to allow the backend to use modern pythons without having to
> upgrade the server (which is required if using say mod_python). The wsgi process
> runs as an ordinary user which eases some tasks.

Yes - I've done something very similar with ajp-wsgi (from the author
of flup; and which incidently performs very well works really nicely)
to go from apache -> wsgi. But the issue I'm asking about here is to
have multiple WSGI processes - ie to allow concurrent execution of
more than one web service at the time (since these are long running
computational soap web services). ajp-wsgi embeds a single python
interpreter so multiple running services would be effected by the GIL
- I imagine flup is similar (a single process on the python side).

So I'm not worried about decoupling from the web server - I'm happy to
use pure python server (which I guess is easier to setup) - but I want
the web server to dispatch requests to different processes running the
wsgi app. I've looked at Spawning, but couldn't get it to work and it
seems a little bit 'beta' for my taste (doesn't exit cleanly, leaves
worker processes running etc.)

Cheers

Robin





From pete.forman at westerngeco.com  Wed Feb 11 08:42:26 2009
From: pete.forman at westerngeco.com (Pete Forman)
Date: Wed, 11 Feb 2009 13:42:26 +0000
Subject: optparse versus getopt
References: <f257b9ab0902101306w1a4633f5t77e9af32088b3297@mail.gmail.com>
	<4991F3DB.5000802@tim.thechases.com>
	<f257b9ab0902101342o2285872co2752d8ad3795083a@mail.gmail.com>
	<gmssmk$eai$1@ger.gmane.org>
	<f257b9ab0902101532g58b17b72sd735db4cdbbed5a0@mail.gmail.com>
	<mailman.9291.1234309202.3487.python-list@python.org>
Message-ID: <63jhum2l.fsf@wgmail2.gatwick.eur.slb.com>

Robert Kern <robert.kern at gmail.com> writes:

>> is there some way i can force the import based on the the absolute
>> path to the module?
>
 > Better would be for you to copy the optparse.py module onto your
 > Jython's import path. I'm not particularly familiar with the details
 > of Jython, so you will need to consult with the Jython documentation
 > unless if a Jython expert can jump in here. Here is one message
 > describing this procedure:
>
 >   http://osdir.com/ml/lang.jython.user/2004-01/msg00086.html

Here are notes from some of my code which can run on Jython.  You
might also like to check out Jython 2.5 which is in beta.

  Jython 2.2 needs optparse.py and textwrap.py.  These can be copied
  from Python 2.3 or Optik 1.4.1 or later.  May also need gettext.py
  and locale.py.

-- 
Pete Forman                -./\.-  Disclaimer: This post is originated
WesternGeco                  -./\.-   by myself and does not represent
pete.forman at westerngeco.com    -./\.-   the opinion of Schlumberger or
http://petef.22web.net           -./\.-   WesternGeco.


From steve at holdenweb.com  Wed Feb 11 09:26:38 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 09:26:38 -0500
Subject: getopt index out of range
In-Reply-To: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
Message-ID: <gmun7c$puu$1@ger.gmane.org>

Matthew Sacks wrote:
> Hi List,
> I am getting an index out of range error when trying to parse with getopt.
> Probably something simple. Any suggestions are appreciated
> 
> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
> 
> 
> #Assign Opts
> connectPassword = optlist[0][1]
> adminServerURL = optlist[1][1]
> action = optlist[2][1]
> targets = optlist[3][1]
> appDir = optlist[4][1]
> 
> #this statement never gets executed
> print "Args: " + connectPassword + " " + adminServerURL + " " + action
> + " " + targets + " " + appDir
> 
>   File "/home/msacks/untitled4.py", line 23, in ?
> IndexError: index out of range: 0
> 
It might help a little if you made it more obvious which was line 23 ...

The real problem, though, is a misunderstanding of what getopt.getopt()
returns. The (option, value) pairs are only returned for options found
in the command line, so you can't guarantee there'll be four.

Set your values to defaults, then adjust for those for which an option
is found in the list, as in the "typical usage" example in the Fine Manual.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb 11 09:42:45 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 09:42:45 -0500
Subject: Functional schmunctional...
In-Reply-To: <gmt0pf$t6u$1@ger.gmane.org>
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
Message-ID: <gmuo5k$tdt$1@ger.gmane.org>

Terry Reedy wrote:
> r0g wrote:
> 
>>
>> def inet2ip(n):
>>   p = (n/16777216)
>>   q = ((n-(p*16777216))/65536)
>>   r = ((n-((p*16777216)+(q*65536)))/256)
>>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> Beyond what other wrote:
> To future-proof code, use // instead of / for integer division.
> To get both quotient and remainder, use divmod(num,den)
> For future reading (and generalization) documenting magic constants helps.
> 
> In 3.0:
> 
> def inet2ip(n):
>   p = (n//16777216)
>   q = ((n-(p*16777216))//65536)
>   r = ((n-((p*16777216)+(q*65536)))//256)
>   s = ((n-((p*16777216)+(q*65536)+(r*256))))
>   return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> def inet2ip2(n):
>     p,n=divmod(n,16777216) # 1<<24
>     q,n=divmod(n,65536) # 1<<16
>     r,s=divmod(n,256) # 1<<8
>     return str(p)+"."+str(q)+"."+str(r)+"."+str(s)
> 
> print(inet2ip(1000000000), inet2ip2(1000000000))
> 
>>>>
> 59.154.202.0 59.154.202.0
> 
Jeez, doesn't anyone read the fine manual any more? I hope this was just
an academic exercise.

>>> socket.inet_ntoa(struct.pack("!l", 1000000000))
'59.154.202.0'
>>>

Holden's rule: when it looks simple enough to be worth including in the
standard library it may well already *be* in the standard library.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jonathan.chacon at telefonica.net  Wed Feb 11 09:44:45 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Wed, 11 Feb 2009 15:44:45 +0100
Subject: Get an image from a webcam in macOS
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAIAcWNRwqt5NlGfOhdO75b3CgAAAEAAAAFIzh9foQ91OqDOxhkHTu7gBAAAAAA==@telefonica.net>

Hello,
 
I can get an Image from a webcam in windows but I don't know how can I
get an image from the webcam in a macbook in leopard.
 
How can I do this?
 
thanks and regards
    Jonathan Chac?n
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From google at mrabarnett.plus.com  Wed Feb 11 10:11:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 11 Feb 2009 15:11:24 +0000
Subject: getopt index out of range
In-Reply-To: <gmun7c$puu$1@ger.gmane.org>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
	<gmun7c$puu$1@ger.gmane.org>
Message-ID: <4992EA9C.4010207@mrabarnett.plus.com>

Steve Holden wrote:
> Matthew Sacks wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>>
>> #this statement never gets executed
>> print "Args: " + connectPassword + " " + adminServerURL + " " + action
>> + " " + targets + " " + appDir
>>
>>   File "/home/msacks/untitled4.py", line 23, in ?
>> IndexError: index out of range: 0
>>
> It might help a little if you made it more obvious which was line 23 ...
> 
It a guess I'd say it was:

     connectPassword = optlist[0][1]

because the traceback says the index is 0 and there's only one line with 
a 0 in it!

> The real problem, though, is a misunderstanding of what getopt.getopt()
> returns. The (option, value) pairs are only returned for options found
> in the command line, so you can't guarantee there'll be four.
> 
> Set your values to defaults, then adjust for those for which an option
> is found in the list, as in the "typical usage" example in the Fine Manual.
> 


From robince at gmail.com  Wed Feb 11 10:12:43 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 07:12:43 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
Message-ID: <b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>

On Feb 11, 1:28?pm, Robin <robi... at gmail.com> wrote:
> On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
>
> > We've used forked fastcgi (flup) with success as that decouples the wsgi process
> > (in our case django) from the main server (in our case apache). Our reasons for
> > doing that were to allow the backend to use modern pythons without having to
> > upgrade the server (which is required if using say mod_python). The wsgi process
> > runs as an ordinary user which eases some tasks.

I'm sorry - I originally missed the worked 'forked' and hence the
whole point of your message I think.

I looked at flup before but had forgotten about the forked version.
Having revisited it I think the forked version does keep a process
pool so each request is processed by a seperate process, which is
exactly what I wanted.

Cheers

Robin


From jaywgraves at gmail.com  Wed Feb 11 10:13:13 2009
From: jaywgraves at gmail.com (jay graves)
Date: Wed, 11 Feb 2009 07:13:13 -0800 (PST)
Subject: Pycon 2009 Hotel?
Message-ID: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>

I'm attending Pycon this year and for the first time I have to pay for
myself.  (All training/conference budgets have been zeroed out at my
company.)

I would like to take the cheaper option by staying at the Crowne Plaza
but as I understand it, the part of the conference I'll be attending
will be held at the Hyatt Regency.  I don't mind the walk but I also
don't want to miss out on the open spaces in the evening.

Is anyone else similarly on the fence?  I'd like to save $130 ((153 -
100) * 3) but since I'm not staying for the sprints and alot of my
enjoyment of the conference is the open spaces.




From deets at nospam.web.de  Wed Feb 11 10:16:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 11 Feb 2009 16:16:43 +0100
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
	<b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>
Message-ID: <6vg8erFjrh7aU1@mid.uni-berlin.de>

Robin wrote:

> On Feb 11, 1:28?pm, Robin <robi... at gmail.com> wrote:
>> On Feb 11, 12:10?pm, Robin Becker <ro... at reportlab.com> wrote:
>>
>> > We've used forked fastcgi (flup) with success as that decouples the
>> > wsgi process (in our case django) from the main server (in our case
>> > apache). Our reasons for doing that were to allow the backend to use
>> > modern pythons without having to upgrade the server (which is required
>> > if using say mod_python). The wsgi process runs as an ordinary user
>> > which eases some tasks.
> 
> I'm sorry - I originally missed the worked 'forked' and hence the
> whole point of your message I think.
> 
> I looked at flup before but had forgotten about the forked version.
> Having revisited it I think the forked version does keep a process
> pool so each request is processed by a seperate process, which is
> exactly what I wanted.

You can have that with mod_wsgi & daemon mode as well, with presumably less
setup hassle.

Diez


From jaywgraves at gmail.com  Wed Feb 11 10:17:38 2009
From: jaywgraves at gmail.com (jay graves)
Date: Wed, 11 Feb 2009 07:17:38 -0800 (PST)
Subject: Pycon 2009 Hotel?
References: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>
Message-ID: <770f9939-2623-4562-84cf-ad419b7fbcbf@r15g2000prd.googlegroups.com>

On Feb 11, 9:13?am, jay graves <jaywgra... at gmail.com> wrote:
> I'm attending Pycon this year and for the first time I have to pay for
> myself. ?(All training/conference budgets have been zeroed out at my
> company.)
>
> I would like to take the cheaper option by staying at the Crowne Plaza
> but as I understand it, the part of the conference I'll be attending
> will be held at the Hyatt Regency. ?I don't mind the walk but I also
> don't want to miss out on the open spaces in the evening.
>
> Is anyone else similarly on the fence? ?I'd like to save $130 ((153 -
> 100) * 3) but since I'm not staying for the sprints and alot of my
> enjoyment of the conference is the open spaces.

(Sorry. i hit 'Send' too quickly.)

I'm wondering if I'm being 'penny-wise and pound-foolish'?  I'd hate
to spend all that money to get there and then not enjoy it because I
was at the 'other' hotel.

...
Jay Graves




From michele.simionato at gmail.com  Wed Feb 11 10:18:53 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Wed, 11 Feb 2009 07:18:53 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <a780e247-5a1a-4dd7-a10e-8c78e9ed5af8@e18g2000yqo.googlegroups.com>

On Feb 10, 9:28?pm, r0g <aioe.... at technicalbloke.com> wrote:
> def ip2inet(a):
> ? li = a.split('.')
> ? assert len(li) == 4 or len(li) == 6
> ? return reduce(add,[int(li[e])*(256**((len(li)-1)-e)) for e in
> xrange(0,len(li))])

Aagh! Notice that functional programming is not about filter, map,
reduce and other unreadable constructs: it is much more about avoiding
mutation.

Your problem has been already solved by using the standard library;
however, if you want to know more about functional programming, I
could as well advertise my own series of "Adventures of a Pythonista
in Schemeland" which is facing exactly that topic right now:

http://www.artima.com/weblogs/viewpost.jsp?thread=248953


From nick at craig-wood.com  Wed Feb 11 10:31:56 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Wed, 11 Feb 2009 09:31:56 -0600
Subject: Escaping my own chroot...
References: <gmt446$fq0$1@aioe.org>
Message-ID: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>

r0g <aioe.org at technicalbloke.com> wrote:
>  I'm writing a linux remastering script in python where I need to chroot
>  into a folder, run some system commands and then come out and do some
>  tidying up, un-mounting proc & sys etc.
> 
>  I got in there with os.chroot() and I tried using that to get back out
>  but that didn't work so... is my script trapped in there forever now or
>  is there an un-hacky way to escape?

No!

>  If it is an OS restriction rather than my ignorance of python is there a
>  canonical way of dealing with it? Should I maybe fork a process, have it
>  do the chroot and wait for it to terminate before continuing?

That is the only way...

However this is a solved problem if you use schroot (which works very
well in my experience)

  http://packages.debian.org/sid/schroot
  http://www.debian-administration.org/articles/566

There are definitely debian, ubuntu and centos packages for it if you
look!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From meshko at gmail.com  Wed Feb 11 10:33:29 2009
From: meshko at gmail.com (mk)
Date: Wed, 11 Feb 2009 07:33:29 -0800 (PST)
Subject: SOAP client
Message-ID: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>

Hi,

I'm trying to consume a SOAP web service using Python.  So far I have
found two libraries: SOAPpy and ZSI.  Both of them rely on PyXML which
is no longer maintained (and there is no build for 64bit Windows and
the setup.py doesn't seem to know how to build it on Windows).  Is
there a live SOAP library for Python?  I'm sort of surprised that a
common standard like SOAP is not more actively supported in Python.
I'm probably missing something?

Thanks,
m


From kmmcdonald at medicine.wisc.edu  Wed Feb 11 10:43:22 2009
From: kmmcdonald at medicine.wisc.edu (Ken McDonald)
Date: Wed, 11 Feb 2009 09:43:22 -0600
Subject: access to MS Access password-protected database?
Message-ID: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>

Can anyone direct me towards a code snippet showing how to use Python  
to insert data into a password-protected MS Access database? My google  
searches have been uninformative for dbs that are password-protected.

Thanks,
Ken



From joaorabelo at gmail.com  Wed Feb 11 10:44:27 2009
From: joaorabelo at gmail.com (=?ISO-8859-1?Q?Jo=E3o_Rabelo?=)
Date: Wed, 11 Feb 2009 13:44:27 -0200
Subject: No subject
Message-ID: <21d3d9990902110744r2033d4b2w68bf93ce26997c58@mail.gmail.com>


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From robin at reportlab.com  Wed Feb 11 10:46:45 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 15:46:45 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
Message-ID: <4992F2E5.1000002@chamonix.reportlab.co.uk>

Robin wrote:
..........
> 
> Yes - I've done something very similar with ajp-wsgi (from the author
> of flup; and which incidently performs very well works really nicely)
> to go from apache -> wsgi. But the issue I'm asking about here is to
> have multiple WSGI processes - ie to allow concurrent execution of
> more than one web service at the time (since these are long running
> computational soap web services). ajp-wsgi embeds a single python
> interpreter so multiple running services would be effected by the GIL
> - I imagine flup is similar (a single process on the python side).
> 
> So I'm not worried about decoupling from the web server - I'm happy to
> use pure python server (which I guess is easier to setup) - but I want
> the web server to dispatch requests to different processes running the
> wsgi app. I've looked at Spawning, but couldn't get it to work and it
> seems a little bit 'beta' for my taste (doesn't exit cleanly, leaves
> worker processes running etc.)

well the flup server for fast cgi supports forking if the server is declared as 
an external process in apache. Then the top level of the flup process handles 
each request and passes it off to a forked worker. I cannot recall exactly, but 
I believe that apache mod_fastcgi does the right thing when it comes to 
internally declared fastcgi handlers. For apache at least I think the threading 
issues are handled properly.

I think the preforkserver.py code handles all the threading issues for you 
(assuming it's not win32).
-- 
Robin Becker



From tino at wildenhain.de  Wed Feb 11 10:47:56 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 11 Feb 2009 16:47:56 +0100
Subject: urllib2.Request:: http Request sending successfully, but Response
	contains in valid data.
In-Reply-To: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
References: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
Message-ID: <4992F32C.3050402@wildenhain.de>

Hi,

nRk wrote:
> Hi
> 
> I am trying to send Data to a website through "http" using
> "urllib.request" library using the bellow code.
> Response status code contains. 200 (OK) but Response contains
> nothing...
> 
> With same data When I test using C# it working fine.. Response
> having.. some data in xml format.
> But I am using below python code i am getting response only "<HTML></
> HTML>".

This does not mean you are doing it identical to C# here, doesn't it?
Also you might be looking at the defaults in the calls within C#
and some weird expectations on server side.

Also you are requesting XML by sending a payload of XML data,
so you need to make sure you actually use POST and not GET.

I'd start by watching your working application with
strace or wireshark and compare with the data to and fro
from your python application.

Also I believe there should be example code for reading
RSS feeds from python.


> Is there any in my code..
> 
>  req  = urllib2.Request(url) // url is valid url
>  req.add_header('Authorization','AuthSub token="xxxxxxxxxxxxx"')
>  req.add_header('Content-Type','application/atom+xml')
>  req.data=data  // data is having valid xml data
>  r = urllib2.urlopen(req)

> print(r.code) // output 200
> print(r.msg) // output OK
> print(r.read()) //<HTML></HTML>

Regards
Tino


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From mal at egenix.com  Wed Feb 11 10:48:31 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 11 Feb 2009 16:48:31 +0100
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <6vg8erFjrh7aU1@mid.uni-berlin.de>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>	<b16f569e-95c5-4d77-a480-b8fc2e14bae5@x9g2000yqk.googlegroups.com>
	<6vg8erFjrh7aU1@mid.uni-berlin.de>
Message-ID: <4992F34F.2040306@egenix.com>

On 2009-02-11 16:16, Diez B. Roggisch wrote:
> Robin wrote:
> 
>> On Feb 11, 1:28 pm, Robin <robi... at gmail.com> wrote:
>>> On Feb 11, 12:10 pm, Robin Becker <ro... at reportlab.com> wrote:
>>>
>>>> We've used forked fastcgi (flup) with success as that decouples the
>>>> wsgi process (in our case django) from the main server (in our case
>>>> apache). Our reasons for doing that were to allow the backend to use
>>>> modern pythons without having to upgrade the server (which is required
>>>> if using say mod_python). The wsgi process runs as an ordinary user
>>>> which eases some tasks.
>> I'm sorry - I originally missed the worked 'forked' and hence the
>> whole point of your message I think.
>>
>> I looked at flup before but had forgotten about the forked version.
>> Having revisited it I think the forked version does keep a process
>> pool so each request is processed by a seperate process, which is
>> exactly what I wanted.
> 
> You can have that with mod_wsgi & daemon mode as well, with presumably less
> setup hassle.

Another option that works well on Unix and even Windows is SCGI
which deals with the forking and piping of data for you:

    http://www.mems-exchange.org/software/scgi/
    http://python.ca/scgi/

Lighttpd even ships with a mod_scgi module built-in.

More on the protocol used by SCGI (basically net-strings):

    http://python.ca/scgi/protocol.txt

Unlike FastCGI, it's very easy to setup.

Since SCGI provides standard CGI on the Python side, it's easy to
wrap this up as WSGI interface (using e.g. the code from PEP 333).

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 11 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From mail at timgolden.me.uk  Wed Feb 11 11:17:40 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 11 Feb 2009 16:17:40 +0000
Subject: access to MS Access password-protected database?
In-Reply-To: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>
References: <494C99A4-E73E-47C1-B51D-AE8C29E63687@medicine.wisc.edu>
Message-ID: <4992FA24.50601@timgolden.me.uk>

Ken McDonald wrote:
> Can anyone direct me towards a code snippet showing how to use Python to 
> insert data into a password-protected MS Access database? My google 
> searches have been uninformative for dbs that are password-protected.

Caveat: I've never done it and I have no Access db to hand,
but in a spirit of being helpful...

According to this snippet:

http://www.vb-helper.com/howto_ado_use_access_password.html

it can be done via ADO. You can either roll your own, or you
can use the adodbapi module from the pywin32 extensions.

TJG


From gil.shinar at gmail.com  Wed Feb 11 11:18:58 2009
From: gil.shinar at gmail.com (gil.shinar at gmail.com)
Date: Wed, 11 Feb 2009 08:18:58 -0800 (PST)
Subject: Process crash with no reason
References: <faf6d8b9-55dc-4a09-9463-0d24d2a45eab@s9g2000prg.googlegroups.com>
	<mailman.8044.1232995270.3487.python-list@python.org>
	<adc11e05-81d3-40e5-a52f-d466e68bcdfe@r10g2000prf.googlegroups.com>
	<mailman.8098.1233058222.3487.python-list@python.org>
	<a8a8511a-8368-4e4a-9f87-1c832481b28f@r15g2000prh.googlegroups.com>
	<mailman.8111.1233072005.3487.python-list@python.org>
	<30c13ac1-0ad0-4825-8d5c-301d505e6b66@p2g2000prn.googlegroups.com>
	<mailman.8216.1233164296.3487.python-list@python.org>
	<6732e3c4-8fcc-45c8-8e62-aea7eb64d942@j1g2000yqi.googlegroups.com>
	<mailman.9090.1234107079.3487.python-list@python.org>
Message-ID: <a5ccb709-f3ea-4b09-b593-54e43fe0afc3@u13g2000yqg.googlegroups.com>

On Feb 8, 5:31?pm, Stephen Hansen <apt.shan... at gmail.com> wrote:
> > Thanks a lot and sorry for the late response. My main suspect is the
> > CherryPy.
> > I'm still investigating it.
>
> You're asking for advice but not listening to what people are saying
> here -- why is CherryPy on the top of your list?
>
> What version of CherryPy is it? 1 or 2?
>
> If its 2, then its pure python and there's a really, really low chance
> that its provoking a hard crash w/o a traceback printing before it
> dies out. A hard crash which isn't printing an error message is
> possible in pure Python I suppose, but I've never seen it. A "Bus
> error" for example will kill the interpreter before it can do any
> error handling. But I've only ever seen that when interfacing with
> third party libraries.
>
> If its 1, there is some C so you can bump it up ... and for that I'd
> probably attempt to run the application in a console or with stdout
> manually redirected instead of relying on the logging alone, to see if
> anything useful gets put out.. like "Bus error", at the time it exits.
>
> But why do you keep discarding the Sybase module?
>
> Its most definitely *not* written in python. What Philip and Tim were
> trying to tell you is you are *not* using "python's functions to run
> sybase sql commands"
>
> The Sybase module is a python wrapper around code written in C module
> which is interfacing with a third party library to talk to Sybase. Are
> you at the latest version of Sybase(0.39 if its the same module I'm
> aware of?) How about the library underneath it? FreeTDS or Sybase ASE
> (whatever that is) or whatever else is being used? A bug in /any/ of
> those C layers (notice its *multiple* layers) could propagate up and
> provoke a hard crash that Python doesn't catch. So if you look into
> those versions perhaps one has a new release that fixes bugs.
>
> --S

Hi,

After farther investigation and some help from other developers, we
got to the conclusion that the python process does not crash but the
program exits because cherrypy freezes and the python program has
nothing to do when the web service is not responding. My cherrypy
version is 3.0.1
Can any of you help me with cherrypy or should I ask in cherrypy
group?

Thanks

Gil


From robince at gmail.com  Wed Feb 11 11:19:05 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 08:19:05 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<mailman.9327.1234354259.3487.python-list@python.org>
	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>
	<mailman.9333.1234367215.3487.python-list@python.org>
Message-ID: <79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>

On Feb 11, 3:46?pm, Robin Becker <ro... at reportlab.com> wrote:
> well the flup server for fast cgi supports forking if the server is declared as
> an external process in apache. Then the top level of the flup process handles
> each request and passes it off to a forked worker. I cannot recall exactly, but
> I believe that apache mod_fastcgi does the right thing when it comes to
> internally declared fastcgi handlers. For apache at least I think the threading
> issues are handled properly.
>
> I think the preforkserver.py code handles all the threading issues for you
> (assuming it's not win32).

Thanks - I think if I go the flup route I would use AJP though - since
its very easy to setup with apache (1 proxy line) and mod_ajp comes as
standard. And then everything is very much seperated from the apache
process.



From robince at gmail.com  Wed Feb 11 11:20:23 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 08:20:23 -0800 (PST)
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
Message-ID: <9670bb81-a879-43cc-8abf-040e7b18c59d@q9g2000yqc.googlegroups.com>

On Feb 11, 3:33?pm, mk <mes... at gmail.com> wrote:
> Hi,
>
> I'm trying to consume a SOAP web service using Python. ?So far I have
> found two libraries: SOAPpy and ZSI. ?Both of them rely on PyXML which
> is no longer maintained (and there is no build for 64bit Windows and
> the setup.py doesn't seem to know how to build it on Windows). ?Is
> there a live SOAP library for Python? ?I'm sort of surprised that a
> common standard like SOAP is not more actively supported in Python.
> I'm probably missing something?
>
> Thanks,
> m

For consuming services, I've found suds to be the best client:
https://fedorahosted.org/suds/

For creating them, I've been using soaplib:
http://trac.optio.webfactional.com/

HTH,

Robin


From kyosohma at gmail.com  Wed Feb 11 11:26:39 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 08:26:39 -0800 (PST)
Subject: Pycon 2009 Hotel?
References: <3bb02ed2-bb89-4092-bfea-b9356f214fc6@i18g2000prf.googlegroups.com>
	<770f9939-2623-4562-84cf-ad419b7fbcbf@r15g2000prd.googlegroups.com>
Message-ID: <773f47dc-3bab-407d-a752-b09bc3aaf06f@p13g2000yqc.googlegroups.com>

On Feb 11, 9:17?am, jay graves <jaywgra... at gmail.com> wrote:
> On Feb 11, 9:13?am, jay graves <jaywgra... at gmail.com> wrote:
>
> > I'm attending Pycon this year and for the first time I have to pay for
> > myself. ?(All training/conference budgets have been zeroed out at my
> > company.)
>
> > I would like to take the cheaper option by staying at the Crowne Plaza
> > but as I understand it, the part of the conference I'll be attending
> > will be held at the Hyatt Regency. ?I don't mind the walk but I also
> > don't want to miss out on the open spaces in the evening.
>
> > Is anyone else similarly on the fence? ?I'd like to save $130 ((153 -
> > 100) * 3) but since I'm not staying for the sprints and alot of my
> > enjoyment of the conference is the open spaces.
>
> (Sorry. i hit 'Send' too quickly.)
>
> I'm wondering if I'm being 'penny-wise and pound-foolish'? ?I'd hate
> to spend all that money to get there and then not enjoy it because I
> was at the 'other' hotel.
>
> ...
> Jay Graves

As I understand it, the hotels are connected via a skywalk, so I don't
think it will be a big deal either way. It just means a little extra
walking.

Mike


From notvalid2 at sbcglobal.net  Wed Feb 11 11:28:01 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 08:28:01 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
Message-ID: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>

My program in IDLE bombed with:
==============
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 552, in OperationalSettings
     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 81, in __init__
     tkSimpleDialog.Dialog.__init__(self, parent)
   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
     self.wait_visibility() # window needs to be visible for the grab
   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
     self.tk.call('tkwait', 'visibility', window._w)
TclError: window ".34672232" was deleted before its visibility changed
===============
It runs fine in pythonWin performing the same entry operation. Open a menu, 
  select an item to open a dialog, select a select button in the dialog, 
press OK to leave the dialog. Boom, as above.

(This does not mean pythonWin doesn't have problems of its own. ) If I just 
execute the code (double click on the py file, the console shows no 
problems. IDLE is unhappy.

Another side to this is that I use WinMerge to find differences between my 
last saved copy and the current copy. I found the current copy had two lines 
where a abc.get() was changed to abc.get. This was undoubtedly from briefly 
using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble 
executing the program. My guess is that while briefly editing there, I hit 
some odd combination of keys that produced, perhaps, an invisible character 
that pyWin ignores.

Not the 34672232 window is a dialog that I closed by pressing OK. I would 
again guess, that, if there is a problem, it occurs in the code that 
destroys the dialog.


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From robin at reportlab.com  Wed Feb 11 11:32:42 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 11 Feb 2009 16:32:42 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>	<mailman.9327.1234354259.3487.python-list@python.org>	<e9081ea1-abe7-443f-8fdb-b68ebc301a2b@v15g2000yqn.googlegroups.com>	<mailman.9333.1234367215.3487.python-list@python.org>
	<79153440-e1ae-4703-990c-9c69cd85ee6c@k19g2000yqg.googlegroups.com>
Message-ID: <4992FDAA.8090908@chamonix.reportlab.co.uk>

Robin wrote:
> On Feb 11, 3:46 pm, Robin Becker <ro... at reportlab.com> wrote:
>> well the flup server for fast cgi supports forking if the server is declared as
>> an external process in apache. Then the top level of the flup process handles
>> each request and passes it off to a forked worker. I cannot recall exactly, but
>> I believe that apache mod_fastcgi does the right thing when it comes to
>> internally declared fastcgi handlers. For apache at least I think the threading
>> issues are handled properly.
>>
>> I think the preforkserver.py code handles all the threading issues for you
>> (assuming it's not win32).
> 
> Thanks - I think if I go the flup route I would use AJP though - since
> its very easy to setup with apache (1 proxy line) and mod_ajp comes as
> standard. And then everything is very much seperated from the apache
> process.
.......

that's right and very easy to control. The only problem I recall is that the 
socket needs to be made readable by www. You can do that with a sudo chown or by 
setting up the mask at the ajp server start.
-- 
Robin Becker



From exarkun at divmod.com  Wed Feb 11 11:35:32 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 11 Feb 2009 11:35:32 -0500
Subject: Escaping my own chroot...
In-Reply-To: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>
Message-ID: <20090211163532.12853.310274003.divmod.quotient.8899@henry.divmod.com>

On Wed, 11 Feb 2009 09:31:56 -0600, Nick Craig-Wood <nick at craig-wood.com> wrote:
>r0g <aioe.org at technicalbloke.com> wrote:
>>  I'm writing a linux remastering script in python where I need to chroot
>>  into a folder, run some system commands and then come out and do some
>>  tidying up, un-mounting proc & sys etc.
>>
>>  I got in there with os.chroot() and I tried using that to get back out
>>  but that didn't work so... is my script trapped in there forever now or
>>  is there an un-hacky way to escape?
>
>No!
>

If you still have root in the chroot (and you need root to get in there, so
it's not implausible that you will), then you can get out.  Googling for
"escape chroot" turns up lots of hits.  This page contains a fairly simple,
explicit description of how to get out of a chroot:

   http://www.bpfh.net/simes/computing/chroot-break.html

See the bulleted list in the "Breaking chroot()" section.  Since you also
control the process before the chroot happens, breaking out is even simpler
in your case (just open / before you chroot in the first place).  forking
before doing the chroot may still be a good idea, but it's not the only
solution.

Jean-Paul


From kyosohma at gmail.com  Wed Feb 11 11:44:55 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 08:44:55 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
Message-ID: <b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>

On Feb 11, 10:28?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> My program in IDLE bombed with:
> ==============
> Exception in Tkinter callback
> Traceback (most recent call last):
> ? ?File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> ? ? ?return self.func(*args)
> ? ?File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 552, in OperationalSettings
> ? ? ?dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> ? ?File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 81, in __init__
> ? ? ?tkSimpleDialog.Dialog.__init__(self, parent)
> ? ?File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> ? ? ?self.wait_visibility() # window needs to be visible for the grab
> ? ?File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> ? ? ?self.tk.call('tkwait', 'visibility', window._w)
> TclError: window ".34672232" was deleted before its visibility changed
> ===============
> It runs fine in pythonWin performing the same entry operation. Open a menu,
> ? select an item to open a dialog, select a select button in the dialog,
> press OK to leave the dialog. Boom, as above.
>
> (This does not mean pythonWin doesn't have problems of its own. ) If I just
> execute the code (double click on the py file, the console shows no
> problems. IDLE is unhappy.
>
> Another side to this is that I use WinMerge to find differences between my
> last saved copy and the current copy. I found the current copy had two lines
> where a abc.get() was changed to abc.get. This was undoubtedly from briefly
> using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble
> executing the program. My guess is that while briefly editing there, I hit
> some odd combination of keys that produced, perhaps, an invisible character
> that pyWin ignores.
>
> Not the 34672232 window is a dialog that I closed by pressing OK. I would
> again guess, that, if there is a problem, it occurs in the code that
> destroys the dialog.
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

You don't really say what your code does or if it uses a GUI toolkit
and if so, which one. But my guess is that you are using some kind of
GUI and its GUI and IDLE's are clashing somehow. I see this sort of
thing with some of my wxPython programs from time to time, although
IDLE usually just crashes with no error message.

I would recommend using the command line or something that can open it
in a completely separate process, such as Wingware's IDE.

Mike


From steve at holdenweb.com  Wed Feb 11 11:48:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 11:48:49 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
Message-ID: <gmuvi1$pnr$1@ger.gmane.org>

W. eWatson wrote:
> My program in IDLE bombed with:
> ==============
> Exception in Tkinter callback
> Traceback (most recent call last):
>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>     return self.func(*args)
>   File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 552, in OperationalSettings
>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>   File
> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
> line 81, in __init__
>     tkSimpleDialog.Dialog.__init__(self, parent)
>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>     self.wait_visibility() # window needs to be visible for the grab
>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>     self.tk.call('tkwait', 'visibility', window._w)
> TclError: window ".34672232" was deleted before its visibility changed
> ===============
> It runs fine in pythonWin performing the same entry operation. Open a
> menu,  select an item to open a dialog, select a select button in the
> dialog, press OK to leave the dialog. Boom, as above.
> 
> (This does not mean pythonWin doesn't have problems of its own. ) If I
> just execute the code (double click on the py file, the console shows no
> problems. IDLE is unhappy.
> 
> Another side to this is that I use WinMerge to find differences between
> my last saved copy and the current copy. I found the current copy had
> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> had no trouble executing the program. My guess is that while briefly
> editing there, I hit some odd combination of keys that produced,
> perhaps, an invisible character that pyWin ignores.
> 
> Not the 34672232 window is a dialog that I closed by pressing OK. I
> would again guess, that, if there is a problem, it occurs in the code
> that destroys the dialog.
> 
> 
Well you have to remember that you are trying to run a windowed GUI
under the control of another windows GUI, so it isn't surprising that
you hit trouble.

With IDLE the issue will be that IDLE already created a main window
before your program started running. With PythonWin you are using two
different toolkits, so it isn't really surprising that breaks down -
there will be two entirely separate main loops competing with each other.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From ivanov.maxim at gmail.com  Wed Feb 11 12:01:06 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Wed, 11 Feb 2009 09:01:06 -0800 (PST)
Subject: Could you recommend job schedulling solution?
Message-ID: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>

I've sinlge 8-way node dedicated for executing long running tasks. To
be able to execute multiple tasks on this node it shoud  spawn each
task in another process. At the same time it should accept network
connection with new tasks without blocking of client and put it on job
queue.

What is "task" ? Executing just ordinary python function will be
enough. If solution contain some client library which allow easy task
submit it will be great.


From mark.seagoe at gmail.com  Wed Feb 11 12:01:19 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 09:01:19 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
Message-ID: <002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>

On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>
> > I like the ability to access elements of a struct such as with ctypes
> > Structure:
> >>>> myStruct.elementName1
> > 4
>
> > What I like about it is there are no quotes needed.
>
> > What I don't like about it is that it's not iterable:
> >>>> for n in myStruct: ?<== gives error
> >>>> ? ?print n
>
> > I don't want to force the end user to have preknowledge of the element
> > names.
>
> Note that those names are available as the _fields_ class attribute
>
> > Has anyone subclassed ctypes Structure based class to be iterable?
> > Before a noob starts trying to do this, is it possible? ?How to
> > approach it?
>
> The easiest way would be to define __getitem__ accepting index 0, 1, 2... ?
> until the last defined field.
> Seehttp://docs.python.org/reference/datamodel.html#object.__getitem__
>
> <code>
> ?from ctypes import Structure
>
> class IterableStructure(Structure):
> ? ?def __getitem__(self, i):
> ? ? ?if not isinstance(i, int):
> ? ? ? ?raise TypeError('subindices must be integers: %r' % i)
> ? ? ?return getattr(self, self._fields_[i][0])
>
> </code>
>
> This was tested as much as you see here:
>
> py> from ctypes import c_int
> py>
> py> class POINT(IterableStructure):
> ... ? ? _fields_ = [("x", c_int),
> ... ? ? ? ? ? ? ? ? ("y", c_int)]
> ...
> py> point = POINT(10, 20)
> py> print point.x, point.y
> 10 20
> py> for field in point:
> ... ? print field
> ...
> 10
> 20
> py> print list(point)
> [10, 20]
>
> --
> Gabriel Genellina

Thanks very much, Gabriel.  This is very good start for me.
This works for predefined class.  How about a situation where the
fields are added dynamically (as from reading in from an xml file).
For example, if I were to now add another element:

>>> point.z = 30
>>> print list(point)
[10, 20]
>>> dir(point)
['__class__', '__ctypes_from_outparam__', '__delattr__', '__
dict__', '__doc__', '__getattribute__', '__getitem__', '__ha
sh__', '__init__', '__module__', '__new__', '__reduce__', '_
_reduce_ex__', '__repr__', '__setattr__', '__str__', '__weak
ref__', '_b_base_', '_b_needsfree_', '_fields_', '_objects',
 'x', 'y', 'z']

I don't know why the iterator (where ever it is) didn't get
incremented.  Thanks for any insight.

Mark


From castironpi at gmail.com  Wed Feb 11 12:17:11 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 11 Feb 2009 09:17:11 -0800 (PST)
Subject: generator object or 'send' method?
References: <929da031-95be-4cda-89ea-560e52435243@e1g2000pra.googlegroups.com>
	<6vfo6kFjlnteU1@mid.individual.net>
Message-ID: <61cb6320-3b37-4307-bf3e-8f58593d54b2@k1g2000prb.googlegroups.com>

On Feb 11, 4:41?am, greg <g... at cosc.canterbury.ac.nz> wrote:
> Aaron Brady wrote:
> > It would receive the 'send' from a different point in control
> > flow than its usual 'next'. ?Should it repeat a value if it receives a
> > 'send'?
>
> No. This requirement clearly indicates that send() is
> the wrong tool for the job.
>
> I would use a class with a generator as a method, e.g.
>
> ? ?class Multiples:
>
> ? ? ?m = 1
>
> ? ? ?def set_multiplier(self, m):
> ? ? ? ?self.m = m
>
> ? ? ?def generate(self, limit):
> ? ? ? ?for i in xrange(limit):
> ? ? ? ? ?yield i * self.m
>
> ? ?g = Multiples()
> ? ?for x in g.generate(10):
> ? ? ?print x
> ? ? ?if x == 3:
> ? ? ? ?g.set_multiplier(42)
>
> produces
>
> 0
> 1
> 2
> 3
> 168
> 210
> 252
> 294
> 336
> 378
>
> --
> Greg

Alright, but you don't have to go so far as to create an entire
class.  It's alright to use a formula.  Here's a way to add a
dictionary to a generator instance.

def gen_dict( fun ):
    def inner( *ar, **kw ):
        self.gen= fun( self, *ar, **kw )
        return self
    class GenWrapper:
        def __iter__( self ): return self
        def __next__( self, *ar, **kw ): return self.gen.__next__
( *ar, **kw )
    self= GenWrapper()
    return inner

It's a shame that you can't set 'self.__next__= self.gen.__next__'.
It costs an entire level of call depth.  On the other hand, I'm not
sure a pure delegate class is possible.

The decorator just puts the generator object in a 'gen' attribute, and
adds itself to the '__init__' argument list.  So the generator has a
'self' argument, which is of type 'instance', and allows dynamic
attributes.

@gen_dict
def jumper( self, N= 1, K= 1 ):
    self.N, self.K= N, K
    while 1:
        yield self.N
        self.N+= self.K

j= jumper()
print( next( j ) )
j.K= 4
print( next( j ) )

It might need some touch-ups to run in Python 2.  Neat mix.  It's a
cool hybrid between Terry's and Greg's idea, and a bare generator.
Unfortunately, if you want 'self' to have any methods, you'll probably
need a class... though maybe it could inherit from 'GenWrapper'.  What
do you think?

P.S.  Here's a slightly simpler version.

def gen_dict( fun ):
    class GenWrapper:
        def __init__( self, *ar, **kw ):
            self.gen= fun( self, *ar, **kw )
        def __iter__( self ): return self
        def __next__( self, *ar, **kw ): return self.gen.__next__
( *ar, **kw )
    return GenWrapper

P.P.S.  Simpler, but a line longer.

class GenWrapper:
    def __init__( self, fun ):
        self.fun= fun
    def __call__( self, *ar, **kw ):
        self.gen= self.fun( self, *ar, **kw )
        return self
    def __iter__( self ): return self
    def __next__( self, *ar, **kw ): return self.gen.__next__( *ar,
**kw )


From bedouglas at earthlink.net  Wed Feb 11 12:26:50 2009
From: bedouglas at earthlink.net (bruce)
Date: Wed, 11 Feb 2009 09:26:50 -0800
Subject: Could you recommend job schedulling solution?
In-Reply-To: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
Message-ID: <348b01c98c6d$ee610770$0301a8c0@tmesa.com>

hi...

not sure exactly what you're looking for, but "condor" has a robust job
scheduling architecture for dealing with grid/distributed setups over
multiple systems..

give us more information, and there might be other suggestions!


-----Original Message-----
From: python-list-bounces+bedouglas=earthlink.net at python.org
[mailto:python-list-bounces+bedouglas=earthlink.net at python.org]On Behalf
Of redbaron
Sent: Wednesday, February 11, 2009 9:01 AM
To: python-list at python.org
Subject: Could you recommend job schedulling solution?


I've sinlge 8-way node dedicated for executing long running tasks. To
be able to execute multiple tasks on this node it shoud  spawn each
task in another process. At the same time it should accept network
connection with new tasks without blocking of client and put it on job
queue.

What is "task" ? Executing just ordinary python function will be
enough. If solution contain some client library which allow easy task
submit it will be great.
--
http://mail.python.org/mailman/listinfo/python-list



From wilson at afn.org  Wed Feb 11 12:56:18 2009
From: wilson at afn.org (JBW)
Date: Wed, 11 Feb 2009 17:56:18 GMT
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.11.18.04.57@afn.org>

On Wed, 11 Feb 2009 07:33:29 -0800, mk wrote:

> I'm trying to consume a SOAP web service using Python.

Suds (ibid) -- accept no substitute!


From imageguy1206 at gmail.com  Wed Feb 11 13:01:37 2009
From: imageguy1206 at gmail.com (imageguy)
Date: Wed, 11 Feb 2009 10:01:37 -0800 (PST)
Subject: access to MS Access password-protected database?
References: <mailman.9336.1234368125.3487.python-list@python.org>
Message-ID: <1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>

On Feb 11, 10:43?am, Ken McDonald <kmmcdon... at medicine.wisc.edu>
wrote:
> Can anyone direct me towards a code snippet showing how to use Python ?
> to insert data into a password-protected MS Access database? My google ?
> searches have been uninformative for dbs that are password-protected.
>
> Thanks,
> Ken

You post is a little vague on specifics
- do you actually have access to the db ?
- can you open it with access ?
- can you currently read records using python ?

I am assuming you don't have access to the db through python, once you
do the rest is straight forward.

I use DSN-less connections.  This link below is quite helpful
http://www.carlprothman.net/Default.aspx?tabid=90#ODBCDriverForAccess

If you aren't using the adodbapi (part of the pywin32 package), you
need to do something like this, assuming you access db is MS-Access
2000 and above.

<untested>
import win32com
cnx = win32com.client.Dispatch('ADODB.connection')

parms = {}
parms['driver'] = '{Microsoft Access Driver (*.mdb)}'
parms['dbase'] = path_to_mdb
parms['sys_mdw'] = path_to_workgroup_security
parms['uid'] = userid_defined_in_mdw
parhs['pwd'] = pwd_for_uid_in_mdw

cnxtr = 'Driver=%(driver)s; DBQ=%(dbase)s; SYSTEMDB=%(sys_mdw)s; UID=%
(uid)s; PWD=%(pwd)s; ' % parms
cnx.ConnectionString = cnxstr
cnx.Open()

</untested>
once you have an ADO Connection, execute SQL directly on the
connection like this

cnx.Execute('INSERT INTO tablename (col1, col2) VALUES ('val1,
val2);')

Or alternatively you should create RecordSets and manipulate these.

IF you need help understanding ADO I would recommend;
http://www.w3schools.com/ado/default.asp

The examples are translateable to Python.
You create recordsets via;
rs = win32com.client.Dispatch('ADO.RecordSet')


If you don't have/weren't given the passwords to the DB, but you do
have access to the workgroup file ('*.MDW') file that stores the uid/
pwds and permission, then there are several third party tools that
will recover these for you. Google is your friend.

If you don't have access to the original .mdw ... well, I can't help
you and I don't think anyone can.

Good luck.


From mark.seagoe at gmail.com  Wed Feb 11 13:32:41 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 10:32:41 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
Message-ID: <9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>

On Feb 11, 9:01?am, mark.sea... at gmail.com wrote:
> On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>
>
>
>
>
> > En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>
> > > I like the ability to access elements of a struct such as with ctypes
> > > Structure:
> > >>>> myStruct.elementName1
> > > 4
>
> > > What I like about it is there are no quotes needed.
>
> > > What I don't like about it is that it's not iterable:
> > >>>> for n in myStruct: ?<== gives error
> > >>>> ? ?print n
>
> > > I don't want to force the end user to have preknowledge of the element
> > > names.
>
> > Note that those names are available as the _fields_ class attribute
>
> > > Has anyone subclassed ctypes Structure based class to be iterable?
> > > Before a noob starts trying to do this, is it possible? ?How to
> > > approach it?
>
> > The easiest way would be to define __getitem__ accepting index 0, 1, 2... ?
> > until the last defined field.
> > Seehttp://docs.python.org/reference/datamodel.html#object.__getitem__
>
> > <code>
> > ?from ctypes import Structure
>
> > class IterableStructure(Structure):
> > ? ?def __getitem__(self, i):
> > ? ? ?if not isinstance(i, int):
> > ? ? ? ?raise TypeError('subindices must be integers: %r' % i)
> > ? ? ?return getattr(self, self._fields_[i][0])
>
> > </code>
>
> > This was tested as much as you see here:
>
> > py> from ctypes import c_int
> > py>
> > py> class POINT(IterableStructure):
> > ... ? ? _fields_ = [("x", c_int),
> > ... ? ? ? ? ? ? ? ? ("y", c_int)]
> > ...
> > py> point = POINT(10, 20)
> > py> print point.x, point.y
> > 10 20
> > py> for field in point:
> > ... ? print field
> > ...
> > 10
> > 20
> > py> print list(point)
> > [10, 20]
>
> > --
> > Gabriel Genellina
>
> Thanks very much, Gabriel. ?This is very good start for me.
> This works for predefined class. ?How about a situation where the
> fields are added dynamically (as from reading in from an xml file).
> For example, if I were to now add another element:
>
> >>> point.z = 30
> >>> print list(point)
> [10, 20]
> >>> dir(point)
>
> ['__class__', '__ctypes_from_outparam__', '__delattr__', '__
> dict__', '__doc__', '__getattribute__', '__getitem__', '__ha
> sh__', '__init__', '__module__', '__new__', '__reduce__', '_
> _reduce_ex__', '__repr__', '__setattr__', '__str__', '__weak
> ref__', '_b_base_', '_b_needsfree_', '_fields_', '_objects',
> ?'x', 'y', 'z']
>
> I don't know why the iterator (where ever it is) didn't get
> incremented. ?Thanks for any insight.
>
> Mark- Hide quoted text -
>
> - Show quoted text -

I tinkered with it and think I have viable solution.
I need to append a new member to _fields_ before writing it,
then it seems to work.

>>> p._fields_.append(('z', c_int))
>>> point.z = 30
>>> print 'List:', list(p)
List: [10, 20, 30]

Awesome.  Thanks!


From jeffgemail at gmail.com  Wed Feb 11 13:35:35 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 10:35:35 -0800 (PST)
Subject: Unicode issue on Windows cmd line
Message-ID: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>

Having issue on Windows cmd.
> Python.exe
>>>a = u'\xf0'
>>>print a

This gives a unicode error.

Works fine in IDLE, PythonWin, and my Macbook but I need to run this
from a windows batch.

Character should look like this "?".

Please help!


From mark.seagoe at gmail.com  Wed Feb 11 13:35:36 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 10:35:36 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
Message-ID: <db1bef7c-d5b9-4629-807e-6dbd47ed2004@u1g2000pre.googlegroups.com>

In last post, I mixed code w/ 'p' and 'point'.  Should be:

>>> point._fields_.append(('z', c_int))
>>> point.z = 30
>>> print 'List:', list(point)

List: [10, 20, 30]


From ivanov.maxim at gmail.com  Wed Feb 11 13:48:00 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Wed, 11 Feb 2009 10:48:00 -0800 (PST)
Subject: Could you recommend job schedulling solution?
References: <mailman.9341.1234373219.3487.python-list@python.org>
Message-ID: <090e3273-e017-4cb7-b1dd-4e25ca628ed2@13g2000yql.googlegroups.com>

On 11 ???, 20:26, "bruce" <bedoug... at earthlink.net> wrote:
> hi...
>
> not sure exactly what you're looking for, but "condor" has a robust job
> scheduling architecture for dealing with grid/distributed setups over
> multiple systems..
>
> give us more information, and there might be other suggestions!

Condor, Globus or any other grid system looks like serious overkill
for me. I need some sort of job manager, which accepts jobs from
clients as pickled python functions and queues/executes them. Client
side should be able to ask status of submitted job, their return
value, ask to cancel job etc.


From ntwrkd at gmail.com  Wed Feb 11 13:58:56 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 10:58:56 -0800
Subject: getopt index out of range
In-Reply-To: <4992EA9C.4010207@mrabarnett.plus.com>
References: <f257b9ab0902101116v6bccb635o1d9c7f8c44a5bf67@mail.gmail.com>
	<gmun7c$puu$1@ger.gmane.org> <4992EA9C.4010207@mrabarnett.plus.com>
Message-ID: <f257b9ab0902111058y3b8c94day18020173c81cc8da@mail.gmail.com>

>because the traceback says the index is 0 and there's only one line with a 0 in it!
Indeed. Thank you.


On Wed, Feb 11, 2009 at 7:11 AM, MRAB <google at mrabarnett.plus.com> wrote:
> Steve Holden wrote:
>>
>> Matthew Sacks wrote:
>>>
>>> Hi List,
>>> I am getting an index out of range error when trying to parse with
>>> getopt.
>>> Probably something simple. Any suggestions are appreciated
>>>
>>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>>
>>>
>>> #Assign Opts
>>> connectPassword = optlist[0][1]
>>> adminServerURL = optlist[1][1]
>>> action = optlist[2][1]
>>> targets = optlist[3][1]
>>> appDir = optlist[4][1]
>>>
>>> #this statement never gets executed
>>> print "Args: " + connectPassword + " " + adminServerURL + " " + action
>>> + " " + targets + " " + appDir
>>>
>>>  File "/home/msacks/untitled4.py", line 23, in ?
>>> IndexError: index out of range: 0
>>>
>> It might help a little if you made it more obvious which was line 23 ...
>>
> It a guess I'd say it was:
>
>    connectPassword = optlist[0][1]
>
> because the traceback says the index is 0 and there's only one line with a 0
> in it!
>
>> The real problem, though, is a misunderstanding of what getopt.getopt()
>> returns. The (option, value) pairs are only returned for options found
>> in the command line, so you can't guarantee there'll be four.
>>
>> Set your values to defaults, then adjust for those for which an option
>> is found in the list, as in the "typical usage" example in the Fine
>> Manual.
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From wolfram.hinderer at googlemail.com  Wed Feb 11 14:24:22 2009
From: wolfram.hinderer at googlemail.com (wolfram.hinderer at googlemail.com)
Date: Wed, 11 Feb 2009 11:24:22 -0800 (PST)
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org>
Message-ID: <6262e755-412d-401b-9ddf-e9fb2bba617c@p20g2000yqi.googlegroups.com>

On 10 Feb., 21:28, r0g <aioe.... at technicalbloke.com> wrote:

> def inet2ip(n, l=[], c=4):
> ? if c==0: return ".".join(l)
> ? p = 256**( c-1 )
> ? l.append( str(n/p) )
> ? return inet2ip( n-(n/p)*p, l, c-1 )

> The results for 10000
> iterations of each were as follows...
>
> 0.113744974136 seconds for old INET->IP method
> 27.7441999912 seconds for new INET->IP method
>
> :-/

That's probably because your new function is broken:

>>> def inet2ip(n, l=[], c=4):
  if c==0: return ".".join(l)
  p = 256**( c-1 )
  l.append( str(n/p) )
  return inet2ip( n-(n/p)*p, l, c-1 )

>>> inet2ip(0)
'0.0.0.0'
>>> inet2ip(0)
'0.0.0.0.0.0.0.0'
>>> inet2ip(0)
'0.0.0.0.0.0.0.0.0.0.0.0'



From Scott.Daniels at Acm.Org  Wed Feb 11 14:31:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:31:40 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7xskml9t1r.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
	<7xskml9t1r.fsf@ruckus.brouhaha.com>
Message-ID: <zs2dnfp2E7yAug7UnZ2dnUVZ_rrinZ2d@pdx.net>

Paul Rubin wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> writes:
>> Seems like we may want to say things like, "synchronization points are
>> too be silently ignored."
> 
> That would completely break some useful possible applications, so should
> be avoided.
No, I mean that we, _the_users_of_the_interface_, may want to say, ....
That is, I'd like that behavior as an option.

-Scott David Daniels
Scott.Daniels at Acm.Org



From Scott.Daniels at Acm.Org  Wed Feb 11 14:34:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:34:46 -0800
Subject: zlib interface semi-broken
In-Reply-To: <7xd4dpsvf7.fsf@ruckus.brouhaha.com>
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<7x63jiez9d.fsf@ruckus.brouhaha.com>
	<8K6dneXdHIranQ_UnZ2dnUVZ_u2dnZ2d@pdx.net>
	<7xd4dpsvf7.fsf@ruckus.brouhaha.com>
Message-ID: <zs2dnfV2E7xLug7UnZ2dnUVZ_rrinZ2d@pdx.net>

Paul Rubin wrote:
> Scott David Daniels <Scott.Daniels at Acm.Org> writes:
>> I suspect that is why such an interface never came up (If
>> you can clone states, then you can say: "compress this, then use the
>> resultant state to compress/decompress others." 
> 
> The zlib C interface supports something like that.  It is just not
> exported to the python application.  It should be.
Right, we are gathering ideas we'd like to see available to the Python
programmer in the new zlib / bz2 agglomeration that we are thinking of
building / proposing.

--Scott David Daniels
Scott.Daniels at Acm.Org


From marduk at letterboxes.org  Wed Feb 11 14:35:56 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 11 Feb 2009 14:35:56 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
Message-ID: <1234380956.18084.0.camel@localhost.localdomain>

On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> Having issue on Windows cmd.
> > Python.exe
> >>>a = u'\xf0'
> >>>print a
> 
> This gives a unicode error.
> 
> Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> from a windows batch.
> 
> Character should look like this "?".
> 
> Please help!

You forgot to paste the error.




From Scott.Daniels at Acm.Org  Wed Feb 11 14:36:59 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 11 Feb 2009 11:36:59 -0800
Subject: zlib interface semi-broken
In-Reply-To: <Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
References: <mailman.9266.1234299464.3487.python-list@python.org>	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
Message-ID: <zs2dnfR2E7zGtQ7UnZ2dnUVZ_rrinZ2d@pdx.net>

Scott David Daniels wrote:
> ... I've wanted to do some low-level (C-coded) search w/o bothering
> to create strings until a match....
Here's a more common use case: signature gathering on the contents.

--Scott David Daniels
Scott.Daniels at Acm.Org


From notvalid2 at sbcglobal.net  Wed Feb 11 14:38:04 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 11:38:04 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<b3637820-4a74-43f2-8e04-c72e479fe59c@41g2000yqf.googlegroups.com>
Message-ID: <_NFkl.10312$hc1.10101@flpi150.ffdc.sbc.com>

Mike Driscoll wrote:
> On Feb 11, 10:28 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> My program in IDLE bombed with:
>> ==============
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>    File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>      return self.func(*args)
>>    File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 552, in OperationalSettings
>>      dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>    File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 81, in __init__
>>      tkSimpleDialog.Dialog.__init__(self, parent)
>>    File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>      self.wait_visibility() # window needs to be visible for the grab
>>    File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>      self.tk.call('tkwait', 'visibility', window._w)
>> TclError: window ".34672232" was deleted before its visibility changed
>> ===============
>> It runs fine in pythonWin performing the same entry operation. Open a menu,
>>   select an item to open a dialog, select a select button in the dialog,
>> press OK to leave the dialog. Boom, as above.
>>
>> (This does not mean pythonWin doesn't have problems of its own. ) If I just
>> execute the code (double click on the py file, the console shows no
>> problems. IDLE is unhappy.
>>
>> Another side to this is that I use WinMerge to find differences between my
>> last saved copy and the current copy. I found the current copy had two lines
>> where a abc.get() was changed to abc.get. This was undoubtedly from briefly
>> using the pyWin editor, when I mis-hit some keys. Yet pyWin had no trouble
>> executing the program. My guess is that while briefly editing there, I hit
>> some odd combination of keys that produced, perhaps, an invisible character
>> that pyWin ignores.
>>
>> Note the 34672232 window is a dialog that I closed by pressing OK. I would
>> again guess, that, if there is a problem, it occurs in the code that
>> destroys the dialog.

> 
> You don't really say what your code does or if it uses a GUI toolkit
> and if so, which one. But my guess is that you are using some kind of
> GUI and its GUI and IDLE's are clashing somehow. I see this sort of
> thing with some of my wxPython programs from time to time, although
> IDLE usually just crashes with no error message.
> 
> I would recommend using the command line or something that can open it
> in a completely separate process, such as Wingware's IDE.
> 
> Mike
Tkinter. Isn't just clicking on the py file enough to side step either of 
the two? I did it and it worked fine. The code is for a GUI that has five or 
  so menus on the main window bar, and manipulates video that is downloaded 
to it from a video camera. The problem occurs in a dialog in which a user 
enters configuration values, like the time to start/stop the camera. As soon 
as I press OK on the dialog the program dies as above. It wasn't doing that 
at all for days despite some heavy editing. A WinMerge shows its quite 
faithful to it's last working predecessor. That's how I found the get problem.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 14:39:29 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 11:39:29 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <mailman.9340.1234370960.3487.python-list@python.org>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
Message-ID: <iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> My program in IDLE bombed with:
>> ==============
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>     return self.func(*args)
>>   File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 552, in OperationalSettings
>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>   File
>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>> line 81, in __init__
>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>     self.wait_visibility() # window needs to be visible for the grab
>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>     self.tk.call('tkwait', 'visibility', window._w)
>> TclError: window ".34672232" was deleted before its visibility changed
>> ===============
>> It runs fine in pythonWin performing the same entry operation. Open a
>> menu,  select an item to open a dialog, select a select button in the
>> dialog, press OK to leave the dialog. Boom, as above.
>>
>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>> just execute the code (double click on the py file, the console shows no
>> problems. IDLE is unhappy.
>>
>> Another side to this is that I use WinMerge to find differences between
>> my last saved copy and the current copy. I found the current copy had
>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>> had no trouble executing the program. My guess is that while briefly
>> editing there, I hit some odd combination of keys that produced,
>> perhaps, an invisible character that pyWin ignores.
>>
>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>> would again guess, that, if there is a problem, it occurs in the code
>> that destroys the dialog.
>>
>>
> Well you have to remember that you are trying to run a windowed GUI
> under the control of another windows GUI, so it isn't surprising that
> you hit trouble.
> 
> With IDLE the issue will be that IDLE already created a main window
> before your program started running. With PythonWin you are using two
> different toolkits, so it isn't really surprising that breaks down -
> there will be two entirely separate main loops competing with each other.
> 
> regards
>  Steve
Not quite. I take down IDLE when I run pyWin, and vice versa.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From namire at gmail.com  Wed Feb 11 14:44:25 2009
From: namire at gmail.com (namire)
Date: Wed, 11 Feb 2009 11:44:25 -0800 (PST)
Subject: Replace unknow string varible in file.
References: <7ec460c5-b625-47e5-88c9-15156533c7da@t13g2000yqc.googlegroups.com>
	<mailman.9286.1234307028.3487.python-list@python.org>
Message-ID: <ee6ee71d-4b9e-47d3-80b0-708b081d616a@o11g2000yql.googlegroups.com>

Thanks to Vlastimil Brom for his example and r0g for his helpful
attitude and hyperlinks I was able to made program do what was
needed.  Terry the comments in the html are not important I was just
saying that if I could cover the undesired strings in html comment
tags then they would not should up on a web browser viewing the file,
lucky I get then erased also so the comments is not needed.  I anyone
wants I can post a pastebin the the full code that uses the regex's.


From jfabiani at yolo.com  Wed Feb 11 14:44:25 2009
From: jfabiani at yolo.com (John Fabiani)
Date: Wed, 11 Feb 2009 11:44:25 -0800
Subject: openOffic, windows, and Python 2.5
Message-ID: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>

Hi,
OpenOffice 3 on windows uses python 2.3.x (I have no idea why).  Does anyone
know where I can get whatever is needed to get python 2.5 working.  I don't
want to learn how recompile openoffice because it has a steep learning
curve and is just to much when I can just use M$ word.

BTW using the openSUSE update to install openOffice3 uses my installed
python.  

Maybe someone has already done the compile and is willing to share?

Thanks in advance
Johnf  


From jeffgemail at gmail.com  Wed Feb 11 14:50:32 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 11:50:32 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
Message-ID: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>

On Feb 11, 2:35?pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > Having issue on Windows cmd.
> > > Python.exe
> > >>>a = u'\xf0'
> > >>>print a
>
> > This gives a unicode error.
>
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
>
> > Character should look like this "?".
>
> > Please help!
>
> You forgot to paste the error.

The error looks like this:
    File "<stdin", line 1, in <module>
    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
      return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
position 0
: character maps to <undefined>


Running Python 2.5.4 on Windows XP


From steve at holdenweb.com  Wed Feb 11 14:51:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 11 Feb 2009 14:51:50 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
Message-ID: <gmva99$3ds$1@ger.gmane.org>

W. eWatson wrote:
> Steve Holden wrote:
>> W. eWatson wrote:
>>> My program in IDLE bombed with:
>>> ==============
>>> Exception in Tkinter callback
>>> Traceback (most recent call last):
>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>     return self.func(*args)
>>>   File
>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>
>>> line 552, in OperationalSettings
>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>   File
>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>
>>> line 81, in __init__
>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>     self.wait_visibility() # window needs to be visible for the grab
>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>     self.tk.call('tkwait', 'visibility', window._w)
>>> TclError: window ".34672232" was deleted before its visibility changed
>>> ===============
>>> It runs fine in pythonWin performing the same entry operation. Open a
>>> menu,  select an item to open a dialog, select a select button in the
>>> dialog, press OK to leave the dialog. Boom, as above.
>>>
>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>> just execute the code (double click on the py file, the console shows no
>>> problems. IDLE is unhappy.
>>>
>>> Another side to this is that I use WinMerge to find differences between
>>> my last saved copy and the current copy. I found the current copy had
>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>> had no trouble executing the program. My guess is that while briefly
>>> editing there, I hit some odd combination of keys that produced,
>>> perhaps, an invisible character that pyWin ignores.
>>>
>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>> would again guess, that, if there is a problem, it occurs in the code
>>> that destroys the dialog.
>>>
>>>
>> Well you have to remember that you are trying to run a windowed GUI
>> under the control of another windows GUI, so it isn't surprising that
>> you hit trouble.
>>
>> With IDLE the issue will be that IDLE already created a main window
>> before your program started running. With PythonWin you are using two
>> different toolkits, so it isn't really surprising that breaks down -
>> there will be two entirely separate main loops competing with each other.
>>
> Not quite. I take down IDLE when I run pyWin, and vice versa.
> 
The two separate loops being PyWin (which uses MFC) and your program
(which uses Tkinter). You just can't mix GUIs in the same process like
that, sorry.

regards
 Stedve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Shawn at Milochik.com  Wed Feb 11 14:55:14 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 11 Feb 2009 14:55:14 -0500
Subject: re.sub and named groups
In-Reply-To: <gmt4tk$jph$1@panix3.panix.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<gmt4tk$jph$1@panix3.panix.com>
Message-ID: <2dc0c81b0902111155r3bf37a03j86023099a9ce1a00@mail.gmail.com>

>
> Book recommendation: _Mastering Regular Expressions_, Jeffrey Friedl
> --
> Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

I wholeheartedly second this! The third edition is out now.


From stef.mientki at gmail.com  Wed Feb 11 14:58:39 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 11 Feb 2009 20:58:39 +0100
Subject: hpw to convert a linux python script ?
Message-ID: <49932DEF.3000102@gmail.com>

hello,

I've a python script, written for some Linux version,
now I want to run it under windows.
It complains of not finding files in
  /usr/share/tinybldLin/  ....
where .... is the directory where the script is located and started from.

As there are a whole lot of these lines, in a whole lot of files,
I wonder if there's a simple trick to point
  /usr/share/tinybldLin/
to my directory ?


thanks,
Stef


From http  Wed Feb 11 14:58:45 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 11:58:45 -0800
Subject: zlib interface semi-broken
References: <mailman.9266.1234299464.3487.python-list@python.org>
	<hoednTBHVNRFbwzUnZ2dnUVZ_j2dnZ2d@pdx.net>
	<mailman.9287.1234307540.3487.python-list@python.org>
	<Qq-dnQcWhYjNAA_UnZ2dnUVZ_gidnZ2d@pdx.net>
	<7xskml9t1r.fsf@ruckus.brouhaha.com>
	<zs2dnfp2E7yAug7UnZ2dnUVZ_rrinZ2d@pdx.net>
Message-ID: <7xtz70agp6.fsf@ruckus.brouhaha.com>

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> >> Seems like we may want to say things like, "synchronization points are
> >> too be silently ignored."
> No, I mean that we, _the_users_of_the_interface_, may want to say, ....
> That is, I'd like that behavior as an option.

I don't see any reason to want that (rather than letting the application
handle it) but I'll take your word for it.


From Graham.Dumpleton at gmail.com  Wed Feb 11 14:59:33 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 11 Feb 2009 11:59:33 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
Message-ID: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>

On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
> Hi,
>
> I am building some computational web services using soaplib. This
> creates a WSGI application.
>
> However, since some of these services are computationally intensive,
> and may be long running, I was looking for a way to use multiple
> processes. I thought about using multiprocessing.Process manually in
> the service, but I was a bit worried about how that might interact
> with a threaded server (I was hoping the thread serving that request
> could just wait until the child is finished). Also it would be good to
> keep the services as simple as possible so it's easier for people to
> write them.
>
> I have at the moment the following WSGI structure:
> TransLogger(URLMap(URLParser(soaplib objects)))
> although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> As I've found with all web-related Python stuff, I'm overwhelmed by
> the choice and number of alternatives. I've so far been using cherrypy
> and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> What would be the simplest [quickest to setup and fewest details of
> the server required - ideally with a simple example] and most reliable
> [this will eventually be 'in production' as part of a large scientific
> project] way to host this sort of WSGI with a process-per-request
> style?

In this sort of situation one wouldn't normally do the work in the
main web server, but have a separarte long running daemon process
embedding mini web server that understands XML-RPC. The main web
server would then make XML-RPC requests against the backend daemon
process, which would use threading and or queueing to handle the
requests.

If the work is indeed long running, the backend process would normally
just acknowledge the request and not wait. The web page would return
and it would be up to user to then somehow occassionally poll web
server, manually or by AJAX, to see how progres is going. That is,
further XML-RPC requests from main server to backend daemon process
asking about progress.

I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
are really appropriate as you don't want this done in web server
processes as then you are at mercy of web server processes being
killed or dying when part way through something. Some of these systems
will do this if requests take too long. Thus better to offload real
work to another process.

Graham


From martin at marcher.name  Wed Feb 11 15:00:32 2009
From: martin at marcher.name (Martin)
Date: Wed, 11 Feb 2009 21:00:32 +0100
Subject: Could you recommend job schedulling solution?
In-Reply-To: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
References: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
Message-ID: <5fa6c12e0902111200t5c29d6bbpefbfe1bfd29b987e@mail.gmail.com>

Hi,

2009/2/11 redbaron <ivanov.maxim at gmail.com>:
> should accept network
> connection with new tasks without blocking of client and put it on job
> queue.
>
> What is "task" ? Executing just ordinary python function will be
> enough. If solution contain some client library which allow easy task
> submit it will be great.

I think parallel python will take of that for you
(http://www.parallelpython.com/)

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From benjamin.kaplan at case.edu  Wed Feb 11 15:08:50 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 15:08:50 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
	<53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
Message-ID: <ec96e1390902111208w319e6d8blfc465da16293b397@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:50 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 2:35 pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> > On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > > Having issue on Windows cmd.
> > > > Python.exe
> > > >>>a = u'\xf0'
> > > >>>print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > You forgot to paste the error.
>
> The error looks like this:
>    File "<stdin", line 1, in <module>
>    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
>      return codecs.charmap_encode(input,errors,encoding_map)
> UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
> position 0
> : character maps to <undefined>
>
>
> Running Python 2.5.4 on Windows XP



That isn't a python problem, it's a Windows problem. For "compatibility
reasons", Microsoft never added Unicode support to cmd.  When you do print
u'', python tries to convert the characters to the console encoding (the
really old cp437, not even the Windows standard cp1252), it messes up.
AFAIK, you'll have to use the chcp command to switch to an encoding that has
the character and then print u'\xf0'.encode(the_encoding) to get it to
display. There isn't any way around it- we've tried.


> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tenax.raccoon at gmail.com  Wed Feb 11 15:09:57 2009
From: tenax.raccoon at gmail.com (Jason)
Date: Wed, 11 Feb 2009 12:09:57 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
Message-ID: <ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>

On Feb 11, 5:16?am, bearophileH... at lycos.com wrote:
> christopher.saun... at durham.ac.uk (c d saunter):
>
> >I assume it is a feature of the compiler.<
>
> Yes it's a bug-prone antifeature that's probably a relic from C that
> doesn't have a concatenation operator among strings as Python does
> (+). So in Python it saves you to use + at the cost of possible bugs.
>
> Bye,
> bearophile

I've used this feature in C and Python when I want to wrap strings
without having a newlines in the strings... grouping the whole bunch
with a set of parenthesis to make the concatenation explicit.
Admittedly, I wouldn't be broken up if this feature became deprecated,
as

It does do a minor optimization in Python and most C compilers.  The
two string constants are concatenated when the code is parsed, rather
than when the code is executed.

>>> from dis import dis
>>> def f():
...   return 'This is '  'an example.'
...
>>> dis(f)
  2           0 LOAD_CONST               1 ('This is an example.')
              3 RETURN_VALUE
>>>

It's such a minor optimization, that you probably wouldn't see any
effect on your program.

  --Jason


From kmtracey at gmail.com  Wed Feb 11 15:16:05 2009
From: kmtracey at gmail.com (Karen Tracey)
Date: Wed, 11 Feb 2009 15:16:05 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<mailman.9343.1234380950.3487.python-list@python.org>
	<53cca468-4d7a-47b5-ac94-5b63042fff2c@g3g2000pre.googlegroups.com>
Message-ID: <af3536270902111216p73808a16w989da8674bfadc8f@mail.gmail.com>

On Wed, Feb 11, 2009 at 2:50 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 2:35 pm, Albert Hopkins <mar... at letterboxes.org> wrote:
> > On Wed, 2009-02-11 at 10:35 -0800, jeffg wrote:
> > > Having issue on Windows cmd.
> > > > Python.exe
> > > >>>a = u'\xf0'
> > > >>>print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > You forgot to paste the error.
>
> The error looks like this:
>    File "<stdin", line 1, in <module>
>    File "C:\python25\lib\encodings\cp437.py", line 12, in encode
>      return codecs.charmap_encode(input,errors,encoding_map)
> UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
> position 0
> : character maps to <undefined>
>
>
> Running Python 2.5.4 on Windows XP
>

First, you may need to change your command prompt Properties->Font to use
Lucida Console rather than raster fonts.  Then you'll need to change the
code page using chcp to something that has a mapping for the character you
want. E.g.:

D:\>chcp
Active code page: 437

D:\>python
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = u'\xf0'
>>> print a
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\bin\Python2.5.2\lib\encodings\cp437.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\xf0' in
position 0: character maps to <undefined>
>>> quit()

D:\>chcp 1252
Active code page: 1252

D:\>python
Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = u'\xf0'
>>> print a
?
>>> quit()

D:\>

(Just changing the code page works to avoid the UnicodeEncodeError, but with
raster fonts that character displays as thee horizontal bars.)

Karen
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From kenneth.m.mcdonald at sbcglobal.net  Wed Feb 11 15:24:40 2009
From: kenneth.m.mcdonald at sbcglobal.net (Kenneth McDonald)
Date: Wed, 11 Feb 2009 14:24:40 -0600
Subject: access to MS Access password-protected database?
In-Reply-To: <1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>
References: <mailman.9336.1234368125.3487.python-list@python.org>
	<1ed39fa1-5996-4e62-8d81-155a2597cec3@f40g2000pri.googlegroups.com>
Message-ID: <12ABC69A-8E0D-4ED2-A941-471725DCBA55@sbcglobal.net>

Sorry for the vagueness.

I do have access to the file and can open it using Access. I haven't  
yet done anything involving Python and Access (or Python and Win  
interfacing, for that matter.)

Thanks,
Ken


On Feb 11, 2009, at 12:01 PM, imageguy wrote:

> On Feb 11, 10:43 am, Ken McDonald <kmmcdon... at medicine.wisc.edu>
> wrote:
>> Can anyone direct me towards a code snippet showing how to use Python
>> to insert data into a password-protected MS Access database? My  
>> google
>> searches have been uninformative for dbs that are password-protected.
>>
>> Thanks,
>> Ken
>
> You post is a little vague on specifics
> - do you actually have access to the db ?
> - can you open it with access ?
> - can you currently read records using python ?
>
> I am assuming you don't have access to the db through python, once you
> do the rest is straight forward.
>
> I use DSN-less connections.  This link below is quite helpful
> http://www.carlprothman.net/Default.aspx?tabid=90#ODBCDriverForAccess
>
> If you aren't using the adodbapi (part of the pywin32 package), you
> need to do something like this, assuming you access db is MS-Access
> 2000 and above.
>
> <untested>
> import win32com
> cnx = win32com.client.Dispatch('ADODB.connection')
>
> parms = {}
> parms['driver'] = '{Microsoft Access Driver (*.mdb)}'
> parms['dbase'] = path_to_mdb
> parms['sys_mdw'] = path_to_workgroup_security
> parms['uid'] = userid_defined_in_mdw
> parhs['pwd'] = pwd_for_uid_in_mdw
>
> cnxtr = 'Driver=%(driver)s; DBQ=%(dbase)s; SYSTEMDB=%(sys_mdw)s; UID=%
> (uid)s; PWD=%(pwd)s; ' % parms
> cnx.ConnectionString = cnxstr
> cnx.Open()
>
> </untested>
> once you have an ADO Connection, execute SQL directly on the
> connection like this
>
> cnx.Execute('INSERT INTO tablename (col1, col2) VALUES ('val1,
> val2);')
>
> Or alternatively you should create RecordSets and manipulate these.
>
> IF you need help understanding ADO I would recommend;
> http://www.w3schools.com/ado/default.asp
>
> The examples are translateable to Python.
> You create recordsets via;
> rs = win32com.client.Dispatch('ADO.RecordSet')
>
>
> If you don't have/weren't given the passwords to the DB, but you do
> have access to the workgroup file ('*.MDW') file that stores the uid/
> pwds and permission, then there are several third party tools that
> will recover these for you. Google is your friend.
>
> If you don't have access to the original .mdw ... well, I can't help
> you and I don't think anyone can.
>
> Good luck.
> --
> http://mail.python.org/mailman/listinfo/python-list



From stojek at part-gmbh.de  Wed Feb 11 15:28:58 2009
From: stojek at part-gmbh.de (MarcusD)
Date: Wed, 11 Feb 2009 21:28:58 +0100
Subject: Clearing the keyboard buffer (wxPython)
Message-ID: <gmvceq$952$03$1@news.t-online.com>


Platform: MSW (XP) Python 2.5 wxPython 2.8
Topic: Clear Keyboard buffer

Hi,
I hope I am not off topic asking a wxpython question.
I'm writing a Score counter for Dart games. The software
shows graphical output on a Canvas and accepts keyboard
input (no buttons, no widgest). A stripped version looks
like that:

self.Bind(wx.EVT_CHAR,OnKeyEvent)
.
.
#--------------
    def OnKeyEvent(self, event):
      k =event.GetKeyCode()
      try:
        z=chr(k)
      except:
        return
      if (z in ["0","1","2","3","4","5","6","7","8","9",.."\r"..]:
        self.keystr +=z
        score=self.CalculateScore(self.keystr)
        self.DisplayScore(score)
        .
        .
      if z== "\r" #enter
        self.SayScore(score)
        self.NextPlayer()
#--------------
    def SayScore(self,number):
      if number > 100:
        a=os.path.join(self.wavpath,"100.wav")
        b=os.path.join(self.wavpath,"%i.wav"%(number-100))
      else:
        a=os.path.join(self.wavpath,"%i.wav"%(number))
        b=""
      sound1 = wx.Sound(a)
      sound2 = wx.Sound(b)
      sound1.Play(wx.SOUND_SYNC)
      if b:
        sound2.HurryupandPlay(wx.SOUND_SYNC)
#--------------

The problem is, that during the voice output all keystrokes
are buffered somewhere and are processed when SayScore is
finished. So I have to clear the keyboard buffer at the end
of SayScore. Something like:

  evt=MagicFetchPendingKeyEventFunction()
  while evt:
    evt=MagicFetchPendingKeyEventFunction()

I was thinking about threading (maybe using delayedresults), but
this might be a little oversized for my problem.
Playing the sound ASYNC doesn't work here.

Any ideas?
Thanks in advance
Marcus




From aleksandr.goretoy at gmail.com  Wed Feb 11 15:35:52 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Wed, 11 Feb 2009 14:35:52 -0600
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>

GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
managing a server and all it's services this way as well. Just manage dns
entries. Although, there are limitations depending on your project needs of
what libs you need to use.

appengine.google.com

-Alex Goretoy
http://www.goretoy.com



On Wed, Feb 11, 2009 at 1:59 PM, Graham Dumpleton <
Graham.Dumpleton at gmail.com> wrote:

> On Feb 11, 8:50 pm, Robin <robi... at gmail.com> wrote:
> > Hi,
> >
> > I am building some computational web services using soaplib. This
> > creates a WSGI application.
> >
> > However, since some of these services are computationally intensive,
> > and may be long running, I was looking for a way to use multiple
> > processes. I thought about using multiprocessing.Process manually in
> > the service, but I was a bit worried about how that might interact
> > with a threaded server (I was hoping the thread serving that request
> > could just wait until the child is finished). Also it would be good to
> > keep the services as simple as possible so it's easier for people to
> > write them.
> >
> > I have at the moment the following WSGI structure:
> > TransLogger(URLMap(URLParser(soaplib objects)))
> > although presumably, due to the beauty of WSGI, this shouldn't matter.
> >
> > As I've found with all web-related Python stuff, I'm overwhelmed by
> > the choice and number of alternatives. I've so far been using cherrypy
> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > What would be the simplest [quickest to setup and fewest details of
> > the server required - ideally with a simple example] and most reliable
> > [this will eventually be 'in production' as part of a large scientific
> > project] way to host this sort of WSGI with a process-per-request
> > style?
>
> In this sort of situation one wouldn't normally do the work in the
> main web server, but have a separarte long running daemon process
> embedding mini web server that understands XML-RPC. The main web
> server would then make XML-RPC requests against the backend daemon
> process, which would use threading and or queueing to handle the
> requests.
>
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
>
> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> are really appropriate as you don't want this done in web server
> processes as then you are at mercy of web server processes being
> killed or dying when part way through something. Some of these systems
> will do this if requests take too long. Thus better to offload real
> work to another process.
>
> Graham
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From johannalecschueler at googlemail.com  Wed Feb 11 15:37:05 2009
From: johannalecschueler at googlemail.com (Alec Schueler)
Date: Wed, 11 Feb 2009 12:37:05 -0800 (PST)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org>
Message-ID: <8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>

On Feb 11, 7:58?pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> As there are a whole lot of these lines, in a whole lot of files,
> I wonder if there's a simple trick to point
> ? /usr/share/tinybldLin/
> to my directory ?
>
> thanks,
> Stef

Find and replace?


From kyosohma at gmail.com  Wed Feb 11 15:45:56 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 12:45:56 -0800 (PST)
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
Message-ID: <d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>

On Feb 11, 2:28?pm, "MarcusD" <sto... at part-gmbh.de> wrote:
> Platform: MSW (XP) Python 2.5 wxPython 2.8
> Topic: Clear Keyboard buffer
>
> Hi,
> I hope I am not off topic asking a wxpython question.
> I'm writing a Score counter for Dart games. The software
> shows graphical output on a Canvas and accepts keyboard
> input (no buttons, no widgest). A stripped version looks
> like that:
>
> self.Bind(wx.EVT_CHAR,OnKeyEvent)
> .
> .
> #--------------
> ? ? def OnKeyEvent(self, event):
> ? ? ? k =event.GetKeyCode()
> ? ? ? try:
> ? ? ? ? z=chr(k)
> ? ? ? except:
> ? ? ? ? return
> ? ? ? if (z in ["0","1","2","3","4","5","6","7","8","9",.."\r"..]:
> ? ? ? ? self.keystr +=z
> ? ? ? ? score=self.CalculateScore(self.keystr)
> ? ? ? ? self.DisplayScore(score)
> ? ? ? ? .
> ? ? ? ? .
> ? ? ? if z== "\r" #enter
> ? ? ? ? self.SayScore(score)
> ? ? ? ? self.NextPlayer()
> #--------------
> ? ? def SayScore(self,number):
> ? ? ? if number > 100:
> ? ? ? ? a=os.path.join(self.wavpath,"100.wav")
> ? ? ? ? b=os.path.join(self.wavpath,"%i.wav"%(number-100))
> ? ? ? else:
> ? ? ? ? a=os.path.join(self.wavpath,"%i.wav"%(number))
> ? ? ? ? b=""
> ? ? ? sound1 = wx.Sound(a)
> ? ? ? sound2 = wx.Sound(b)
> ? ? ? sound1.Play(wx.SOUND_SYNC)
> ? ? ? if b:
> ? ? ? ? sound2.HurryupandPlay(wx.SOUND_SYNC)
> #--------------
>
> The problem is, that during the voice output all keystrokes
> are buffered somewhere and are processed when SayScore is
> finished. So I have to clear the keyboard buffer at the end
> of SayScore. Something like:
>
> ? evt=MagicFetchPendingKeyEventFunction()
> ? while evt:
> ? ? evt=MagicFetchPendingKeyEventFunction()
>
> I was thinking about threading (maybe using delayedresults), but
> this might be a little oversized for my problem.
> Playing the sound ASYNC doesn't work here.
>
> Any ideas?
> Thanks in advance
> Marcus
It's fine to post here with wxPython questions, but I would recommend
the official wxPython mailing list in most cases as it has lots of
experienced users and developers on it: http://wxpython.org/maillist.php

I've never done this sort of thing with wxPython, but you may be able
to use wx.Yield somehow. There are various tips and tricks in the wiki
about working around long running processes that block the GUI's
mainloop here:

http://wiki.wxpython.org/LongRunningTasks

Other than that, I would recommend doing this with pygame or pyglet as
they might be easier to use for this use-case. Here are their sites:

http://www.pyglet.org/
http://www.pygame.org/news.html

HTH

Mike


From stef.mientki at gmail.com  Wed Feb 11 15:48:14 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 11 Feb 2009 21:48:14 +0100
Subject: hpw to convert a linux python script ?
In-Reply-To: <8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
Message-ID: <4993398E.1040909@gmail.com>

Alec Schueler wrote:
> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>   
>> As there are a whole lot of these lines, in a whole lot of files,
>> I wonder if there's a simple trick to point
>>   /usr/share/tinybldLin/
>> to my directory ?
>>
>> thanks,
>> Stef
>>     
>
> Find and replace?
>   
well I was thinking of a more elegant way,
so the scripts remains, or better become multi-platform.

anyway thanks,
Stef
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From stojek at part-gmbh.de  Wed Feb 11 15:54:55 2009
From: stojek at part-gmbh.de (MarcusD)
Date: Wed, 11 Feb 2009 21:54:55 +0100
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
Message-ID: <gmvdve$c32$03$1@news.t-online.com>

Whow. Thanks for the fast and comprehensive answer. To be honest I would 
have posted to wxpython.org but the server seems to be down for the last 
couple of days.

I'll check this wx.Yield thing that I never heard of. And let's see what 
else we get here.
Thanks again
marcus 




From martin at v.loewis.de  Wed Feb 11 15:57:26 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 11 Feb 2009 21:57:26 +0100
Subject: Unicode issue on Windows cmd line
In-Reply-To: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
Message-ID: <49933bb6$0$3304$9b622d9e@news.freenet.de>

> Having issue on Windows cmd.
>> Python.exe
>>>> a = u'\xf0'
>>>> print a
> 
> This gives a unicode error.
> 
> Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> from a windows batch.
> 
> Character should look like this "?".
> 
> Please help!

Well, your terminal just cannot display this character by default; you
need to use a different terminal program, or reconfigure your terminal.

For example, do

chcp 1252

and select Lucida Console as the terminal font, then try again.

Of course, this will cause *different* characters to become
non-displayable.

Regards,
Martin


From bearophileHUGS at lycos.com  Wed Feb 11 15:57:31 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Wed, 11 Feb 2009 12:57:31 -0800 (PST)
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
	<ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>
Message-ID: <71e3e031-de35-4f7b-91e9-1c14436d36f1@j38g2000yqa.googlegroups.com>

Jason:
> It's such a minor optimization, that you probably wouldn't see any
> effect on your program.

>>> from dis import dis
>>> def f():
...  return 'This is ' + 'an example.'
...
>>> dis(f)
  2           0 LOAD_CONST               3 ('This is an example.')
              3 RETURN_VALUE

Bye,
bearophile


From gervaz at gmail.com  Wed Feb 11 16:01:26 2009
From: gervaz at gmail.com (mattia)
Date: 11 Feb 2009 21:01:26 GMT
Subject: Library similar to UserAgent (perl)
Message-ID: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>

Hi everybody, I'm looking for an easy way to put data in a form, then 
click the button and follow the redirect. Also I need to use cookies. I 
read that using perl this can be done using the UserAgent lib, that also 
provide th browser functionality to let the site believe that you are 
getting the pages from a normali browser like ff. Any suggestion? I think 
that the main concen is to easilly put the data in the numerous textlabel 
provided and then magically simulate the 'click me' button.


From rdmurray at bitdance.com  Wed Feb 11 16:05:00 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 11 Feb 2009 21:05:00 +0000 (UTC)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<4993398E.1040909@gmail.com>
Message-ID: <gmvehs$jp1$1@ger.gmane.org>

Stef Mientki <stef.mientki at gmail.com> wrote:
> Alec Schueler wrote:
> > On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
> >   
> >> As there are a whole lot of these lines, in a whole lot of files,
> >> I wonder if there's a simple trick to point
> >>   /usr/share/tinybldLin/
> >> to my directory ?
> >>
> >> thanks,
> >> Stef
> >>     
> >
> > Find and replace?
> >   
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.
> 
> anyway thanks,

Well, you'll have to rewrite the script so that it doesn't make
assumptions about path names, and we can't help you with that without
seeing some of the script code.  There _might_ be easy fixes, but if the
path is hardcoded in many places in the script...then you will just have
to go through and un-hard-code it.

--RDM



From ptmcg at austin.rr.com  Wed Feb 11 16:05:53 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 11 Feb 2009 13:05:53 -0800 (PST)
Subject: re.sub and named groups
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
Message-ID: <bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>

On Feb 4, 10:51?am, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
> Hi everybody,
>
> I'm having a ball with the power of regular expression

Don't forget the ball you can have with the power of ordinary Python
strings, string methods, and string interpolation!

originalString = "spam:%(first)s ham:%(second)s"
print originalString % { "first" : "foo" , "second" : "" }

prints

spam:foo ham:

with far fewer surprises and false steps.  (Note: Py3K supports this
same feature, but with different interpolation syntax, which I have
not learned yet.)

Book recommendation: Text Processing in Python, by David Mertz (free
online - http://gnosis.cx/TPiP/), in which David advises against
dragging out the RE heavy artillery until you've at least thought
about using ordinary string methods.

-- Paul


From kyosohma at gmail.com  Wed Feb 11 16:05:57 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 13:05:57 -0800 (PST)
Subject: Clearing the keyboard buffer (wxPython)
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
	<gmvdve$c32$03$1@news.t-online.com>
Message-ID: <dd0a705e-83a5-4818-ae4a-cc0674680b21@t11g2000yqg.googlegroups.com>

On Feb 11, 2:54?pm, "MarcusD" <sto... at part-gmbh.de> wrote:
> Whow. Thanks for the fast and comprehensive answer. To be honest I would
> have posted to wxpython.org but the server seems to be down for the last
> couple of days.
>
> I'll check this wx.Yield thing that I never heard of. And let's see what
> else we get here.
> Thanks again
> marcus

Is it? I wondered why I had suddenly stopped getting emails from them,
but my company recently had some email config changes that blocked a
ton of stuff and I just figured that was part of the problem.
Hopefully Robin Dunn can put the smack down on his web hosts...

Mike


From benjamin.kaplan at case.edu  Wed Feb 11 16:06:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:06:43 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <4993398E.1040909@gmail.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<4993398E.1040909@gmail.com>
Message-ID: <ec96e1390902111306w56a35651h5bf996fa9fe70fd7@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:48 PM, Stef Mientki <stef.mientki at gmail.com>wrote:

> Alec Schueler wrote:
>
>> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>>
>>
>>> As there are a whole lot of these lines, in a whole lot of files,
>>> I wonder if there's a simple trick to point
>>>  /usr/share/tinybldLin/
>>> to my directory ?
>>>
>>> thanks,
>>> Stef
>>>
>>>
>>
>> Find and replace?
>>
>>
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.



That's the problem with using external files- unless you can get to the file
by some combination of os and os.path functions, you're pretty much stuck
checking os.name and/or sys.platform and choosing filenames based on that.
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From benjamin.kaplan at case.edu  Wed Feb 11 16:10:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:10:43 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <49933bb6$0$3304$9b622d9e@news.freenet.de>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
Message-ID: <ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:57 PM, "Martin v. L?wis" <martin at v.loewis.de>wrote:

> > Having issue on Windows cmd.
> >> Python.exe
> >>>> a = u'\xf0'
> >>>> print a
> >
> > This gives a unicode error.
> >
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
> >
> > Character should look like this "?".
> >
> > Please help!
>
> Well, your terminal just cannot display this character by default; you
> need to use a different terminal program, or reconfigure your terminal.
>
> For example, do
>
> chcp 1252
>
> and select Lucida Console as the terminal font, then try again.
>
> Of course, this will cause *different* characters to become
> non-displayable.


Well,

>
>
> Regards,
> Martin
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Wed Feb 11 16:13:22 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 16:13:22 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
Message-ID: <ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>

On Wed, Feb 11, 2009 at 4:10 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Wed, Feb 11, 2009 at 3:57 PM, "Martin v. L?wis" <martin at v.loewis.de>wrote:
>
>> > Having issue on Windows cmd.
>> >> Python.exe
>> >>>> a = u'\xf0'
>> >>>> print a
>> >
>> > This gives a unicode error.
>> >
>> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
>> > from a windows batch.
>> >
>> > Character should look like this "?".
>> >
>> > Please help!
>>
>> Well, your terminal just cannot display this character by default; you
>> need to use a different terminal program, or reconfigure your terminal.
>>
>> For example, do
>>
>> chcp 1252
>>
>> and select Lucida Console as the terminal font, then try again.
>>
>> Of course, this will cause *different* characters to become
>> non-displayable.
>
>
> Well,
>

Whoops. Didn't mean to hit send there. I was going to say, you can't have
everything when Microsoft is only willing to break the programs that average
people are going to use on a daily basis. I mean, why would they do
something nice for the international community at the expense of breaking
some 20 year old batch scripts? Those were the only things that still worked
when Vista first came out.



>>
>> Regards,
>> Martin
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From tjreedy at udel.edu  Wed Feb 11 16:22:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 16:22:25 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
	<gmu5sr$t8q$1@ger.gmane.org>
	<1f1aebe9287c2339bc670a6347d65440.squirrel@acooke.dyndns.org>
Message-ID: <gmvfid$o23$1@ger.gmane.org>

andrew cooke wrote:
> Terry Reedy wrote:
>> Reverse the test order
>>
>> def fact(n):
>>      if n > 0: return fact(n-1)*n
>>      if n == 0: return 1
>>      raise ValueError
> 
> sweet!  but is this generally possible?

I believe so, for some meaning of 'generally'.

 > ie: did you think this up for
> this question or is it an idiom that you find yourself using often?

It is an idiom I developed for an algorithm book-in-progress that will 
include  detailed comparisons of 'body' recursive (my term for 'not tail 
recursive", such as fact() above), tail recursive, and iterative 
versions of algorithms.

Here are written-for-didactic-purposes tail and iterative versions of 
fact that are computationally equivalent to the above in that they 
compute the same expression, (...((1*1)*2)*....*n), without commutative 
or associative transformation, and raise the same error (expanded).

def fact_tail(n, i=0, res=1):
     if i < n: return fact_tail(n, i+1, res*(i+1))
     if i == n: return res
     raise ValueError("Input negative or non-integral")

def fact_iter(n, i=0, res=1):
     while i < n: i,res = i+1, res*(i+1)
     if i == n: return res
     raise ValueError("Input negative or non-integral")

My original reason for writing the tail recursion in the same reversed 
order was to make the conversion to iteration as obvious as possible. 
But I them noticed that it also made possible 'test once for bad input 
without a separate function."

Terry Jan Reedy



From sjmachin at lexicon.net  Wed Feb 11 16:25:07 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 13:25:07 -0800 (PST)
Subject: hpw to convert a linux python script ?
References: <mailman.9346.1234382315.3487.python-list@python.org> 
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com> 
	<mailman.9352.1234385290.3487.python-list@python.org>
Message-ID: <1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>

On Feb 12, 7:48?am, Stef Mientki <stef.mien... at gmail.com> wrote:
> Alec Schueler wrote:
> > On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>
> >> As there are a whole lot of these lines, in a whole lot of files,
> >> I wonder if there's a simple trick to point
> >> ? /usr/share/tinybldLin/
> >> to my directory ?
>
> >> thanks,
> >> Stef
>
> > Find and replace?
>
> well I was thinking of a more elegant way,
> so the scripts remains, or better become multi-platform.

Your current setup is not even single-platform portable ... consider
the scenario where some Linux admin wants your gear to live in some
directory other than /usr/share/tinybldLin/

The standard technique for ensuring that kind of portability involves:
1. Find the directory in which your script lives. Inspect sys.argv[0],
use some os.path.some_functionality() to extract the directory, name
it (say) home_base.
2. When you want to open a data file in the script's directory, do
this:
   the_path = os.path.join(home_base, 'stef1.dat')
   f = open(the_path, .....)

NOTE: Use os.path.join() instead of some DIY technique; it knows
better than you what the path separator is on the OS it's being run
on. In fact, read the whole of the os.path manual carefully before you
jump in to changing your code.

If you prefer to have the data files in (say) .../script_locn/data
instead of .../script_locn, the adjustment should be obvious.

Unfortunately, you are still going to need use find and replace to fix
your script. Code in haste, repent at leisure :-)

HTH,
John





From sevillad at gmail.com  Wed Feb 11 16:27:07 2009
From: sevillad at gmail.com (David Sevilla)
Date: Wed, 11 Feb 2009 13:27:07 -0800 (PST)
Subject: Locating python
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com>
	<3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com> 
	<df45ffa9-6796-4984-a718-bb520ad944de@v13g2000vbb.googlegroups.com>
Message-ID: <604aa733-8e19-4e07-8dde-277d38dde1be@v39g2000yqm.googlegroups.com>

> On Feb 3, 7:30?pm, andrew cooke <and... at acooke.org> wrote:
>
> > the exact details of what you are reporting seem a bit odd, but i have
> > seen a similar error because i have tried to use my own account to
> > install the package, instead of using root.
>
> > what i believe happens is that easy_install first tries to create the
> > "test" file, and then checks it is there. ?if it is not there, you get
> > an error. ?normally the error explains that you need to run as root,
> > but i assume in your case it doesn't - that seems odd, but it seemed
> > worth mentioning anyway.
>
> > so if you have not done so, instead of
>
> > ? python setup.py install
>
> > do
>
> > ? sudo python setup.py install
>
> > more generally, i have used opensuse 11.0 and 11.1, and generally
> > things work just fine, so i would check you are following all the
> > instructions correctly.
>
> > good luck,
> > andrew

Well, finally it worked. I even uninstalled python and all related
stuff with yast2, installed it all again, then

wget http://peak.telecommunity.com/dist/ez_setup.py
su
/path/to/python ez_setup.py

and I got the same error: a certain file could not be created, and

 /usr/local/lib/python2.5/site-packages/

does not exist. Well, I just created them manually (/usr/local/lib was
empty) and it worked.

When I tried to use easy_install for mnemosyne, I got the same error
_but_ this time I was told about running as root (I did it from
another terminal). Now I got it installed (still not working,
something called qt) but the python installation problem is solved.
Thank you very much to all those who contributed.

Regards,

David


From notvalid2 at sbcglobal.net  Wed Feb 11 16:27:24 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 13:27:24 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <mailman.9344.1234381941.3487.python-list@python.org>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
Message-ID: <uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>

Steve Holden wrote:
> W. eWatson wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> My program in IDLE bombed with:
>>>> ==============
>>>> Exception in Tkinter callback
>>>> Traceback (most recent call last):
>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>     return self.func(*args)
>>>>   File
>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>
>>>> line 552, in OperationalSettings
>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>   File
>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>
>>>> line 81, in __init__
>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>> ===============
>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>> menu,  select an item to open a dialog, select a select button in the
>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>
>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>> just execute the code (double click on the py file, the console shows no
>>>> problems. IDLE is unhappy.
>>>>
>>>> Another side to this is that I use WinMerge to find differences between
>>>> my last saved copy and the current copy. I found the current copy had
>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>> had no trouble executing the program. My guess is that while briefly
>>>> editing there, I hit some odd combination of keys that produced,
>>>> perhaps, an invisible character that pyWin ignores.
>>>>
>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>> would again guess, that, if there is a problem, it occurs in the code
>>>> that destroys the dialog.
>>>>
>>>>
>>> Well you have to remember that you are trying to run a windowed GUI
>>> under the control of another windows GUI, so it isn't surprising that
>>> you hit trouble.
>>>
>>> With IDLE the issue will be that IDLE already created a main window
>>> before your program started running. With PythonWin you are using two
>>> different toolkits, so it isn't really surprising that breaks down -
>>> there will be two entirely separate main loops competing with each other.
>>>
>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>>
> The two separate loops being PyWin (which uses MFC) and your program
> (which uses Tkinter). You just can't mix GUIs in the same process like
> that, sorry.
> 
> regards
>  Stedve
I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and 
pyWin are being run together.

Assume neither is running.
a. run IDLE, and execute program
b. close IDLE script, and interactive window. Kill py program
result: boom
c. run pyWin and execute program
d. do same as b for pyWin
resulst: all OK
e. repeat a and b.
Result: boom

Repeat the above and you get the same results.

I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above. 
I switched to it to see if it work there. It did. I double clicked on the py 
file, and it worked fine. Can you explain this?


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From shandy.b at gmail.com  Wed Feb 11 16:30:30 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 11 Feb 2009 13:30:30 -0800 (PST)
Subject: CPython loading modules into memory
Message-ID: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>

Can someone describe the details of how Python loads modules into
memory?  I assume once the .py file is compiled to .pyc that it is
mmap'ed in.  But that assumption is very naive.  Maybe it uses an
anonymous mapping?  Maybe it does other special magic?  This is all
very alien to me, so if someone could explain it in terms that a
person who never usually worries about memory could understand, that
would be much appreciated.

Follow up: is this process different if the modules are loaded from a
zipfile?

If there is a link that covers this info, that'd be great too.


From graham.dumpleton at gmail.com  Wed Feb 11 16:32:36 2009
From: graham.dumpleton at gmail.com (Graham Dumpleton)
Date: Thu, 12 Feb 2009 08:32:36 +1100
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
Message-ID: <88e286470902111332t50a60708g8bba776b0c7f5b69@mail.gmail.com>

2009/2/12 alex goretoy <aleksandr.goretoy at gmail.com>:
> GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
> managing a server and all it's services this way as well. Just manage dns
> entries. Although, there are limitations depending on your project needs of
> what libs you need to use.

GAE is not suitable as they kill off any requests that take more than
a set time. That time isn't that long, so can't support long running
requests.

Graham

> appengine.google.com
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
>
> On Wed, Feb 11, 2009 at 1:59 PM, Graham Dumpleton
> <Graham.Dumpleton at gmail.com> wrote:
>>
>> On Feb 11, 8:50 pm, Robin <robi... at gmail.com> wrote:
>> > Hi,
>> >
>> > I am building some computational web services using soaplib. This
>> > creates a WSGI application.
>> >
>> > However, since some of these services are computationally intensive,
>> > and may be long running, I was looking for a way to use multiple
>> > processes. I thought about using multiprocessing.Process manually in
>> > the service, but I was a bit worried about how that might interact
>> > with a threaded server (I was hoping the thread serving that request
>> > could just wait until the child is finished). Also it would be good to
>> > keep the services as simple as possible so it's easier for people to
>> > write them.
>> >
>> > I have at the moment the following WSGI structure:
>> > TransLogger(URLMap(URLParser(soaplib objects)))
>> > although presumably, due to the beauty of WSGI, this shouldn't matter.
>> >
>> > As I've found with all web-related Python stuff, I'm overwhelmed by
>> > the choice and number of alternatives. I've so far been using cherrypy
>> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
>> > What would be the simplest [quickest to setup and fewest details of
>> > the server required - ideally with a simple example] and most reliable
>> > [this will eventually be 'in production' as part of a large scientific
>> > project] way to host this sort of WSGI with a process-per-request
>> > style?
>>
>> In this sort of situation one wouldn't normally do the work in the
>> main web server, but have a separarte long running daemon process
>> embedding mini web server that understands XML-RPC. The main web
>> server would then make XML-RPC requests against the backend daemon
>> process, which would use threading and or queueing to handle the
>> requests.
>>
>> If the work is indeed long running, the backend process would normally
>> just acknowledge the request and not wait. The web page would return
>> and it would be up to user to then somehow occassionally poll web
>> server, manually or by AJAX, to see how progres is going. That is,
>> further XML-RPC requests from main server to backend daemon process
>> asking about progress.
>>
>> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
>> are really appropriate as you don't want this done in web server
>> processes as then you are at mercy of web server processes being
>> killed or dying when part way through something. Some of these systems
>> will do this if requests take too long. Thus better to offload real
>> work to another process.
>>
>> Graham
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>


From kyosohma at gmail.com  Wed Feb 11 16:33:26 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Wed, 11 Feb 2009 13:33:26 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org> 
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org> 
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
Message-ID: <5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>

On Feb 11, 3:27?pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
> Steve Holden wrote:
> > W. eWatson wrote:
> >> Steve Holden wrote:
> >>> W. eWatson wrote:
> >>>> My program in IDLE bombed with:
> >>>> ==============
> >>>> Exception in Tkinter callback
> >>>> Traceback (most recent call last):
> >>>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> >>>> ? ? return self.func(*args)
> >>>> ? File
> >>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>>> line 552, in OperationalSettings
> >>>> ? ? dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> >>>> ? File
> >>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>>> line 81, in __init__
> >>>> ? ? tkSimpleDialog.Dialog.__init__(self, parent)
> >>>> ? File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> >>>> ? ? self.wait_visibility() # window needs to be visible for the grab
> >>>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> >>>> ? ? self.tk.call('tkwait', 'visibility', window._w)
> >>>> TclError: window ".34672232" was deleted before its visibility changed
> >>>> ===============
> >>>> It runs fine in pythonWin performing the same entry operation. Open a
> >>>> menu, ?select an item to open a dialog, select a select button in the
> >>>> dialog, press OK to leave the dialog. Boom, as above.
>
> >>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
> >>>> just execute the code (double click on the py file, the console shows no
> >>>> problems. IDLE is unhappy.
>
> >>>> Another side to this is that I use WinMerge to find differences between
> >>>> my last saved copy and the current copy. I found the current copy had
> >>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> >>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> >>>> had no trouble executing the program. My guess is that while briefly
> >>>> editing there, I hit some odd combination of keys that produced,
> >>>> perhaps, an invisible character that pyWin ignores.
>
> >>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
> >>>> would again guess, that, if there is a problem, it occurs in the code
> >>>> that destroys the dialog.
>
> >>> Well you have to remember that you are trying to run a windowed GUI
> >>> under the control of another windows GUI, so it isn't surprising that
> >>> you hit trouble.
>
> >>> With IDLE the issue will be that IDLE already created a main window
> >>> before your program started running. With PythonWin you are using two
> >>> different toolkits, so it isn't really surprising that breaks down -
> >>> there will be two entirely separate main loops competing with each other.
>
> >> Not quite. I take down IDLE when I run pyWin, and vice versa.
>
> > The two separate loops being PyWin (which uses MFC) and your program
> > (which uses Tkinter). You just can't mix GUIs in the same process like
> > that, sorry.
>
> > regards
> > ?Stedve
>
> I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and
> pyWin are being run together.
>
> Assume neither is running.
> a. run IDLE, and execute program
> b. close IDLE script, and interactive window. Kill py program
> result: boom
> c. run pyWin and execute program
> d. do same as b for pyWin
> resulst: all OK
> e. repeat a and b.
> Result: boom
>
> Repeat the above and you get the same results.
>
> I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above.
> I switched to it to see if it work there. It did. I double clicked on the py
> file, and it worked fine. Can you explain this?
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

What Steve (and I) are saying is that IDLE has it's own mainloop and
your program has a mainloop too as it sounds like it is running a
Tkinter app. Sometimes when you run a Tk app from another Tk app, the
two mainloops clash and have weird issue like this one.

If you just double-click it or run it from the command line, you only
have one mainloop (i.e. the one that's part of your app). Thus, no
conflicts.

Mike


From google at mrabarnett.plus.com  Wed Feb 11 16:34:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 11 Feb 2009 21:34:59 +0000
Subject: Unicode issue on Windows cmd line
In-Reply-To: <ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>	<49933bb6$0$3304$9b622d9e@news.freenet.de>	<ec96e1390902111310nba10515n5dd4c4312a0976f4@mail.gmail.com>
	<ec96e1390902111313m12f6b3bdv9020ddf075c2c39d@mail.gmail.com>
Message-ID: <49934483.3010000@mrabarnett.plus.com>

Benjamin Kaplan wrote:
[snip]
> Whoops. Didn't mean to hit send there. I was going to say, you can't 
> have everything when Microsoft is only willing to break the programs 
> that average people are going to use on a daily basis. I mean, why 
> would they do something nice for the international community at the 
> expense of breaking some 20 year old batch scripts? Those were the 
> only things that still worked when Vista first came out.
> 
I remember when I had to use MS-Access but it could be either of 2 versions.

The newer version couldn't open a database from the older version unless
I let it convert it first, after which point I wouldn't be able to open
it in the older version... :-(


From tjreedy at udel.edu  Wed Feb 11 16:44:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 11 Feb 2009 16:44:12 -0500
Subject: openOffic, windows, and Python 2.5
In-Reply-To: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
Message-ID: <gmvgr7$s9n$1@ger.gmane.org>

John Fabiani wrote:
> Hi,
> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).

I presume because no one has volunteered to do the update for the Py-UNO 
bridge.  In any case, why do you consider that to be a problem.  It is 
common for apps to include the Python they are known to work with.

tjr



From robert.kern at gmail.com  Wed Feb 11 16:45:25 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 11 Feb 2009 15:45:25 -0600
Subject: CPython loading modules into memory
In-Reply-To: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
Message-ID: <gmvgtm$t1t$1@ger.gmane.org>

On 2009-02-11 15:30, sjbrown wrote:
> Can someone describe the details of how Python loads modules into
> memory?  I assume once the .py file is compiled to .pyc that it is
> mmap'ed in.  But that assumption is very naive.  Maybe it uses an
> anonymous mapping?  Maybe it does other special magic?  This is all
> very alien to me, so if someone could explain it in terms that a
> person who never usually worries about memory could understand, that
> would be much appreciated.

Python will read the .py file and compile into bytecode. This bytecode will be 
written out to a .pyc file as a caching mechanism; if the .pyc exists and has a 
newer timestamp than the .py file, the .py file will not be read or compiled. 
The bytecode will simply be read from the .pyc file.

The .pyc file is not really a map of a memory structure, per se. It is simply a 
disk representation of the bytecode. This bytecode is *executed* by the Python 
VM to populate a module's namespace (which is just a dict) in memory. I believe 
it is then discarded.

> Follow up: is this process different if the modules are loaded from a
> zipfile?

Only in that the .py or .pyc will be extracted from the zipfile instead of being 
read directly from disk.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From sjmachin at lexicon.net  Wed Feb 11 16:48:58 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 13:48:58 -0800 (PST)
Subject: getopt index out of range
References: <mailman.9249.1234293397.3487.python-list@python.org>
Message-ID: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>

On Feb 11, 6:16?am, Matthew Sacks <ntw... at gmail.com> wrote:
> Hi List,
> I am getting an index out of range error when trying to parse with getopt.
> Probably something simple. Any suggestions are appreciated
>
> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>
> #Assign Opts
> connectPassword = optlist[0][1]
> adminServerURL = optlist[1][1]
> action = optlist[2][1]
> targets = optlist[3][1]
> appDir = optlist[4][1]

As you have been told, it is blowing up on index 0. That is because
optlist is empty (in this case). optlist can contain anything from 0
items to as many as your user cares to type in. It is NOT limited to
the number of different options specified in the getopt call; consider
the case where the arg string is "--action add --action del". Further,
the contents of optlist are presented in the order they are typed in
by the user.

Consequently any attempt to give meaningful names to option values
using constant subscripting of optlist is prima facie an utter
nonsense.

It is a mind-bogglingly astonishing utter nonsense given the lengthy
conversation about getopt that we had in another thread yesterday.
What on earth are you doing???



From martin at v.loewis.de  Wed Feb 11 17:00:24 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 11 Feb 2009 23:00:24 +0100
Subject: CPython loading modules into memory
In-Reply-To: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
Message-ID: <49934A78.10309@v.loewis.de>

> Can someone describe the details of how Python loads modules into
> memory?  I assume once the .py file is compiled to .pyc that it is
> mmap'ed in.  But that assumption is very naive.  Maybe it uses an
> anonymous mapping?  Maybe it does other special magic?  This is all
> very alien to me, so if someone could explain it in terms that a
> person who never usually worries about memory could understand, that
> would be much appreciated.

There is no magic whatsoever. Python opens a sequential file descriptor
for the .pyc file, and then reads it in small chunks, "unmarshalling"
it (indeed, the marshal module is used to restore Python objects).

The marshal format is an object serialization in a type-value encoding
(sometimes type-length-value), with type codes for:
- None, True, False
- 32-bit ints, 64-bit ints (unmarshalled into int/long)
- floats, complex
- arbitrary-sized longs
- strings, unicode
- tuples (length + marshal data of values)
- lists
- dicts
- code objects
- a few others

Result of unmarshalling is typically a code object.

> Follow up: is this process different if the modules are loaded from a
> zipfile?

No; it uncompresses into memory, and then unmarshals from there (
compressed block for compressed block)

> If there is a link that covers this info, that'd be great too.

See the description of the marshal module.

HTH,
Martin


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 17:09:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 20:09:20 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
Message-ID: <op.uo7gzdcqx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 16:32:41 -0200, <mark.seagoe at gmail.com> escribi?:
> On Feb 11, 9:01?am, mark.sea... at gmail.com wrote:
>> On Feb 10, 9:52?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
>> wrote:
>> > En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea... at gmail.com> escribi?:
>>
>> > > I like the ability to access elements of a struct such as with > >  
>> ctypes
>> > > Structure:
>> > > What I don't like about it is that it's not iterable:
>> > > I don't want to force the end user to have preknowledge of the > >  
>> element
>> > > names.

[recipe using _fields_]

>> Thanks very much, Gabriel. ?This is very good start for me.
>> This works for predefined class. ?How about a situation where the
>> fields are added dynamically (as from reading in from an xml file).
> I tinkered with it and think I have viable solution.
> I need to append a new member to _fields_ before writing it,
> then it seems to work.
>
>>>> p._fields_.append(('z', c_int))
>>>> point.z = 30
>>>> print 'List:', list(p)
> List: [10, 20, 30]

Yes, that's the way to add a new field -- but you have to do that before
creating the first instance. Anywy, this is somewhat strange for a ctypes
Structure. Usually its memory layout is fixed and mandated by the
library/format/whatever you're trying to bind to.
You are not using it as a generic attribute container, are you? There are
better alternatives in that case.

-- 
Gabriel Genellina



From jeffgemail at gmail.com  Wed Feb 11 17:10:50 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 14:10:50 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
Message-ID: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>

On Feb 11, 3:57?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Having issue on Windows cmd.
> >> Python.exe
> >>>> a = u'\xf0'
> >>>> print a
>
> > This gives a unicode error.
>
> > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > from a windows batch.
>
> > Character should look like this "?".
>
> > Please help!
>
> Well, your terminal just cannot display this character by default; you
> need to use a different terminal program, or reconfigure your terminal.
>
> For example, do
>
> chcp 1252
>
> and select Lucida Console as the terminal font, then try again.
>
> Of course, this will cause *different* characters to become
> non-displayable.
>
> Regards,
> Martin

Thanks, I ended up using encode('iso-8859-15', "replace")
Perhaps more up to date than cp1252...??

It still didn't print correctly, but it did write correctly, which was
my main problem.


From robince at gmail.com  Wed Feb 11 17:19:45 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 14:19:45 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <93a73522-66d6-4276-aa5c-4dc913de6adb@13g2000yql.googlegroups.com>

On Feb 11, 7:59?pm, Graham Dumpleton <Graham.Dumple... at gmail.com>
wrote:
> On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > I am building some computational web services using soaplib. This
> > creates a WSGI application.
>
> > However, since some of these services are computationally intensive,
> > and may be long running, I was looking for a way to use multiple
> > processes. I thought about using multiprocessing.Process manually in
> > the service, but I was a bit worried about how that might interact
> > with a threaded server (I was hoping the thread serving that request
> > could just wait until the child is finished). Also it would be good to
> > keep the services as simple as possible so it's easier for people to
> > write them.
>
> > I have at the moment the following WSGI structure:
> > TransLogger(URLMap(URLParser(soaplib objects)))
> > although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> > As I've found with all web-related Python stuff, I'm overwhelmed by
> > the choice and number of alternatives. I've so far been using cherrypy
> > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > What would be the simplest [quickest to setup and fewest details of
> > the server required - ideally with a simple example] and most reliable
> > [this will eventually be 'in production' as part of a large scientific
> > project] way to host this sort of WSGI with a process-per-request
> > style?
>
> In this sort of situation one wouldn't normally do the work in the
> main web server, but have a separarte long running daemon process
> embedding mini web server that understands XML-RPC. The main web
> server would then make XML-RPC requests against the backend daemon
> process, which would use threading and or queueing to handle the
> requests.
>
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
>
> I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> are really appropriate as you don't want this done in web server
> processes as then you are at mercy of web server processes being
> killed or dying when part way through something. Some of these systems
> will do this if requests take too long. Thus better to offload real
> work to another process.

Thanks - in this case I am contrained to use SOAP (I am providing SOAP
services using soaplib so they run as a WSGI app). I choose soaplib
becuase it seems the simplest way to get soap services running in
Python (I was hoping to get this setup quickly).
So I am not really able to get into anything more complex as you
suggest... I have my nice easy WSGI app soap service, I would just
like it to run in a process pool to avoid GIL. Turns out I can do that
with apache+mod_wsgi and daemon mode, or flup forked server (I would
probably use ajp - so flup is in a seperate process to apache and
listens on some local port, and apache proxies to that using the ajp
protocol). I'm not sure which one is best... for now I'm continuing to
just develop on cherrypy on my own machine.

I suspect I will use ajp forked flup, since that only requires
mod_proxy and mod_proxy_ajp which I understand come with standard
apache and the system administrators will probably be happier with.

Cheers

Robin


From ntwrkd at gmail.com  Wed Feb 11 17:20:36 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 14:20:36 -0800
Subject: getopt index out of range
In-Reply-To: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
References: <mailman.9249.1234293397.3487.python-list@python.org>
	<3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902111420n39859cb3ke23e0f3680362edc@mail.gmail.com>

Perhaps you can give me a call privately and I will explain it to you.
Regards,
Matthew

On Wed, Feb 11, 2009 at 1:48 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 6:16 am, Matthew Sacks <ntw... at gmail.com> wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>
> As you have been told, it is blowing up on index 0. That is because
> optlist is empty (in this case). optlist can contain anything from 0
> items to as many as your user cares to type in. It is NOT limited to
> the number of different options specified in the getopt call; consider
> the case where the arg string is "--action add --action del". Further,
> the contents of optlist are presented in the order they are typed in
> by the user.
>
> Consequently any attempt to give meaningful names to option values
> using constant subscripting of optlist is prima facie an utter
> nonsense.
>
> It is a mind-bogglingly astonishing utter nonsense given the lengthy
> conversation about getopt that we had in another thread yesterday.
> What on earth are you doing???
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From robince at gmail.com  Wed Feb 11 17:22:17 2009
From: robince at gmail.com (Robin)
Date: Wed, 11 Feb 2009 14:22:17 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com> 
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com> 
	<mailman.9358.1234387962.3487.python-list@python.org>
Message-ID: <5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>

On Feb 11, 9:32?pm, Graham Dumpleton <graham.dumple... at gmail.com>
wrote:
> 2009/2/12 alex goretoy <aleksandr.gore... at gmail.com>:
>
> > GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of
> > managing a server and all it's services this way as well. Just manage dns
> > entries. Although, there are limitations depending on your project needs of
> > what libs you need to use.
>
> GAE is not suitable as they kill off any requests that take more than
> a set time. That time isn't that long, so can't support long running
> requests.

GAE is definitely not suitable in this case... The servers are
provided and maintained as part of a large scientific project for
which I am providing just a few services... Other groups are running
services in other platforms on tomcat through soaplab/instantsoap -
but I was hoping to use native python services since I thought it
would be easier.

Cheers

Robin


From ntwrkd at gmail.com  Wed Feb 11 17:27:13 2009
From: ntwrkd at gmail.com (Matthew Sacks)
Date: Wed, 11 Feb 2009 14:27:13 -0800
Subject: getopt index out of range
In-Reply-To: <3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
References: <mailman.9249.1234293397.3487.python-list@python.org>
	<3de24dce-1ee5-4f3f-9ef9-fcc2d28f372e@v5g2000pre.googlegroups.com>
Message-ID: <f257b9ab0902111427l2d6ccb35y3ffc4e8e1a84b28f@mail.gmail.com>

Keep your threadiquette to yourself.

On Wed, Feb 11, 2009 at 1:48 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 11, 6:16 am, Matthew Sacks <ntw... at gmail.com> wrote:
>> Hi List,
>> I am getting an index out of range error when trying to parse with getopt.
>> Probably something simple. Any suggestions are appreciated
>>
>> optlist, args = getopt.getopt(sys.argv[1:], 'h', ['connectPassword=',
>> 'adminServerURL=', 'action=', 'targets=', 'appDir='])
>>
>> #Assign Opts
>> connectPassword = optlist[0][1]
>> adminServerURL = optlist[1][1]
>> action = optlist[2][1]
>> targets = optlist[3][1]
>> appDir = optlist[4][1]
>
> As you have been told, it is blowing up on index 0. That is because
> optlist is empty (in this case). optlist can contain anything from 0
> items to as many as your user cares to type in. It is NOT limited to
> the number of different options specified in the getopt call; consider
> the case where the arg string is "--action add --action del". Further,
> the contents of optlist are presented in the order they are typed in
> by the user.
>
> Consequently any attempt to give meaningful names to option values
> using constant subscripting of optlist is prima facie an utter
> nonsense.
>
> It is a mind-bogglingly astonishing utter nonsense given the lengthy
> conversation about getopt that we had in another thread yesterday.
> What on earth are you doing???
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From gnewsg at gmail.com  Wed Feb 11 17:28:18 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Wed, 11 Feb 2009 14:28:18 -0800 (PST)
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
Message-ID: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>

On Feb 10, 8:38?pm, Richard Gruet <"rgruet at free dot fr"> wrote:
> The Python 2.6 Quick Reference is available in HTML and PDF formats athttp://rgruet.free.fr/#QuickRef.
>
> This time I was helped by Josh Stone for the update.
>
> As usual, your feedback is welcome (pqr at rgruet.net).
>
> Cheers,
>
> Richard Gruet

Thanks a lot. PQR is one of the most useful Python related document on
Internet, IMHO.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From benjamin.kaplan at case.edu  Wed Feb 11 17:35:57 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 11 Feb 2009 17:35:57 -0500
Subject: Unicode issue on Windows cmd line
In-Reply-To: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
Message-ID: <ec96e1390902111435o3facffe9nb7bd135520088549@mail.gmail.com>

On Wed, Feb 11, 2009 at 5:10 PM, jeffg <jeffgemail at gmail.com> wrote:

> On Feb 11, 3:57 pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > > Having issue on Windows cmd.
> > >> Python.exe
> > >>>> a = u'\xf0'
> > >>>> print a
> >
> > > This gives a unicode error.
> >
> > > Works fine in IDLE, PythonWin, and my Macbook but I need to run this
> > > from a windows batch.
> >
> > > Character should look like this "?".
> >
> > > Please help!
> >
> > Well, your terminal just cannot display this character by default; you
> > need to use a different terminal program, or reconfigure your terminal.
> >
> > For example, do
> >
> > chcp 1252
> >
> > and select Lucida Console as the terminal font, then try again.
> >
> > Of course, this will cause *different* characters to become
> > non-displayable.
> >
> > Regards,
> > Martin
>
> Thanks, I ended up using encode('iso-8859-15', "replace")
> Perhaps more up to date than cp1252...??



> It still didn't print correctly, but it did write correctly, which was
> my main problem.


Let me guess, it showed up as *?**. *This is the cp437 symbol at 0xf0.

When Python sends the string to stdout, it doesn't send characters, it sends
a stream of bytes. It is up to the file or file-like object at the other end
(in this case, cmd.exe) to interpret those bytes. Both cp1252 and
ISO-8859-15 interpret the byte /xf0 as ?. When you opened the text file, it
probbly opened as cp1252 because that's the Windows default. If you change
the terminal encoding, it will display correctly for the same reason.




> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From aleksandr.goretoy at gmail.com  Wed Feb 11 17:39:30 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Wed, 11 Feb 2009 16:39:30 -0600
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
	<fa98a9e30902111235m3858e87du949389d402b3f583@mail.gmail.com>
	<mailman.9358.1234387962.3487.python-list@python.org>
	<5db4cb26-1558-44e7-ab34-72d78027740f@f3g2000yqf.googlegroups.com>
Message-ID: <fa98a9e30902111439l55d47ff5wbe913038c63ece6b@mail.gmail.com>

>
>
> GAE is definitely not suitable in this case... The servers are
>> provided and maintained as part of a large scientific project for
>> which I am providing just a few services... Other groups are running
>> services in other platforms on tomcat through soaplab/instantsoap -
>> but I was hoping to use native python services since I thought it
>> would be easier.
>>
>
OK, that's cool. I understand about project requirements. It was just a
suggestion. Nonetheless I'm still interested in what people have to say in
this thread.
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From Graham.Dumpleton at gmail.com  Wed Feb 11 17:55:11 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 11 Feb 2009 14:55:11 -0800 (PST)
Subject: best way to serve wsgi with multiple processes
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com> 
	<93a73522-66d6-4276-aa5c-4dc913de6adb@13g2000yql.googlegroups.com>
Message-ID: <e35fdf9c-6def-4988-b67c-da186366b90c@t39g2000prh.googlegroups.com>

On Feb 12, 9:19?am, Robin <robi... at gmail.com> wrote:
> On Feb 11, 7:59?pm, Graham Dumpleton <Graham.Dumple... at gmail.com>
> wrote:
>
>
>
> > On Feb 11, 8:50?pm, Robin <robi... at gmail.com> wrote:
>
> > > Hi,
>
> > > I am building some computational web services using soaplib. This
> > > creates a WSGI application.
>
> > > However, since some of these services are computationally intensive,
> > > and may be long running, I was looking for a way to use multiple
> > > processes. I thought about using multiprocessing.Process manually in
> > > the service, but I was a bit worried about how that might interact
> > > with a threaded server (I was hoping the thread serving that request
> > > could just wait until the child is finished). Also it would be good to
> > > keep the services as simple as possible so it's easier for people to
> > > write them.
>
> > > I have at the moment the following WSGI structure:
> > > TransLogger(URLMap(URLParser(soaplib objects)))
> > > although presumably, due to the beauty of WSGI, this shouldn't matter.
>
> > > As I've found with all web-related Python stuff, I'm overwhelmed by
> > > the choice and number of alternatives. I've so far been using cherrypy
> > > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
> > > What would be the simplest [quickest to setup and fewest details of
> > > the server required - ideally with a simple example] and most reliable
> > > [this will eventually be 'in production' as part of a large scientific
> > > project] way to host this sort of WSGI with a process-per-request
> > > style?
>
> > In this sort of situation one wouldn't normally do the work in the
> > main web server, but have a separarte long running daemon process
> > embedding mini web server that understands XML-RPC. The main web
> > server would then make XML-RPC requests against the backend daemon
> > process, which would use threading and or queueing to handle the
> > requests.
>
> > If the work is indeed long running, the backend process would normally
> > just acknowledge the request and not wait. The web page would return
> > and it would be up to user to then somehow occassionally poll web
> > server, manually or by AJAX, to see how progres is going. That is,
> > further XML-RPC requests from main server to backend daemon process
> > asking about progress.
>
> > I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi
> > are really appropriate as you don't want this done in web server
> > processes as then you are at mercy of web server processes being
> > killed or dying when part way through something. Some of these systems
> > will do this if requests take too long. Thus better to offload real
> > work to another process.
>
> Thanks - in this case I am contrained to use SOAP (I am providing SOAP
> services using soaplib so they run as a WSGI app). I choose soaplib
> becuase it seems the simplest way to get soap services running in
> Python (I was hoping to get this setup quickly).
> So I am not really able to get into anything more complex as you
> suggest... I have my nice easy WSGI app soap service, I would just
> like it to run in a process pool to avoid GIL.

You can still use SOAP, you don't have to use XML-RPC, they are after
all just an interprocess communications mechanism.

> Turns out I can do that
> with apache+mod_wsgi and daemon mode, or flup forked server (I would
> probably use ajp - so flup is in a seperate process to apache and
> listens on some local port, and apache proxies to that using the ajp
> protocol). I'm not sure which one is best... for now I'm continuing to
> just develop on cherrypy on my own machine.

In mod_wsgi daemon mode the application is still in a distinct
process. The only dfference is that Apache is acting as the process
supervisor and you do not have to install a separate system such as
supervisord or monit to start up the process and ensure it is
restarted if it crashes, as Apache/mod_wsgi will do that for you. You
also don't need flup when using mod_wsgi as it provides everything.

> I suspect I will use ajp forked flup, since that only requires
> mod_proxy and mod_proxy_ajp which I understand come with standard
> apache and the system administrators will probably be happier with.

The Apache/mod_wsgi approach actually has less dependencies. For it
you only need Apache+mod_wsgi. For AJP you need Apache+flup+monit-or-
supervisord. Just depends on which dependencies you think are easier
to configure and manage. :-)

Graham


From antoinedg at gmail.com  Wed Feb 11 18:00:22 2009
From: antoinedg at gmail.com (Antoine De Groote)
Date: Thu, 12 Feb 2009 00:00:22 +0100
Subject: Clearing the keyboard buffer (wxPython)
In-Reply-To: <gmvdve$c32$03$1@news.t-online.com>
References: <gmvceq$952$03$1@news.t-online.com>
	<d162e5c8-89d4-4b23-9b0d-88bb1126fad2@f3g2000yqf.googlegroups.com>
	<gmvdve$c32$03$1@news.t-online.com>
Message-ID: <26bd3$49935887$5449a757$28903@news.hispeed.ch>

yes, the server seems to have been down :-(

MarcusD wrote:
> Whow. Thanks for the fast and comprehensive answer. To be honest I would 
> have posted to wxpython.org but the server seems to be down for the last 
> couple of days.
> 
> I'll check this wx.Yield thing that I never heard of. And let's see what 
> else we get here.
> Thanks again
> marcus 
> 
> 


From daniel.watrous at gmail.com  Wed Feb 11 18:01:01 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Wed, 11 Feb 2009 15:01:01 -0800 (PST)
Subject: where is handle_timeout in SocketServer
Message-ID: <4db93841-0fe9-4e3e-b90d-8e0f9cc986c4@m40g2000yqh.googlegroups.com>

I've just been reading the docs to help me with a SocketServer issue.
I found in the docs (http://docs.python.org/library/socketserver.html)
a reference to a member attribute timeout and a member function
handle_timeout() is made.  I am using python 2.5 and there's no
indication that these were added in 2.6 or later.  I've also searched
Google and found that it may have been committed as long ago as
January of last year (http://mail.python.org/pipermail/python-checkins/
2008-January/064877.html).

Why isn't it available in my version of python?  Is there another
place to find it?  Please help me figure out what I'm missing so that
I can use the timeout functionality in my SocketServers.

Thanks.


From rpolanco at estudiantes.uci.cu  Wed Feb 11 18:09:36 2009
From: rpolanco at estudiantes.uci.cu (Rosell Pupo Polanco)
Date: Wed, 11 Feb 2009 15:09:36 -0800
Subject: how many databases exists?
Message-ID: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>

hello, i am working in pythoncard and i need to know how many databases exist in my server POstgresql, exists some funcion in python that can help me??

greettings..Rosell



.::[ La vida es rica en saberes, pero la vida es breve y no se vive, si no se sabe. ]::.
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From cosmo_general at yahoo.com  Wed Feb 11 18:17:24 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Wed, 11 Feb 2009 15:17:24 -0800 (PST)
Subject: Can I 'LOOK' through urllib?
Message-ID: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>

Hi Folks,

I feel good after played urllib with fun!

Now I want to LOOK to server through urllib. I read the urllib docs,
but I did not find such a function. For example, if there are many
files located in http://www.somedomain.com/data_folder, but I don't
know what the filenames are residing in the data_folder. I wish urllib
would have a function to let me do it, as well as I do 'dir' in DOS,
'ls' on unix/linux. Somebody write me a demo? Thanks!


Muddy Coder


From daniel.watrous at gmail.com  Wed Feb 11 18:21:13 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Wed, 11 Feb 2009 15:21:13 -0800 (PST)
Subject: where is handle_timeout in SocketServer
References: <4db93841-0fe9-4e3e-b90d-8e0f9cc986c4@m40g2000yqh.googlegroups.com>
Message-ID: <05d92dff-0eae-40e9-b456-53f4f73aa507@m42g2000yqb.googlegroups.com>

On Feb 11, 4:01?pm, Daniel <daniel.watr... at gmail.com> wrote:
> I've just been reading the docs to help me with a SocketServer issue.
> I found in the docs (http://docs.python.org/library/socketserver.html)
> a reference to a member attribute timeout and a member function
> handle_timeout() is made. ?I am using python 2.5 and there's no
> indication that these were added in 2.6 or later. ?I've also searched
> Google and found that it may have been committed as long ago as
> January of last year (http://mail.python.org/pipermail/python-checkins/
> 2008-January/064877.html).
>
> Why isn't it available in my version of python? ?Is there another
> place to find it? ?Please help me figure out what I'm missing so that
> I can use the timeout functionality in my SocketServers.
>
> Thanks.

I've just looked at the subversion repository and it does appear that
the timeout functionality was introduced in python 2.6 (or after 2.5.2
anyway).
http://svn.python.org/projects/python/trunk/Lib/SocketServer.py
http://svn.python.org/projects/python/tags/r252/Lib/SocketServer.py

I guess I'll see what I can do to adapt since porting my entire
project isn't realistic at this point.


From notvalid2 at sbcglobal.net  Wed Feb 11 18:28:44 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 15:28:44 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
	<5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
Message-ID: <daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>

Mike Driscoll wrote:
> On Feb 11, 3:27 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> Steve Holden wrote:
>>> W. eWatson wrote:
>>>> Steve Holden wrote:
>>>>> W. eWatson wrote:
>>>>>> My program in IDLE bombed with:
>>>>>> ==============
>>>>>> Exception in Tkinter callback
>>>>>> Traceback (most recent call last):
>>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>>     return self.func(*args)
>>>>>>   File
>>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>>> line 552, in OperationalSettings
>>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>>   File
>>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>>> line 81, in __init__
>>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>>> ===============
>>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>>> just execute the code (double click on the py file, the console shows no
>>>>>> problems. IDLE is unhappy.
>>>>>> Another side to this is that I use WinMerge to find differences between
>>>>>> my last saved copy and the current copy. I found the current copy had
>>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>>> had no trouble executing the program. My guess is that while briefly
>>>>>> editing there, I hit some odd combination of keys that produced,
>>>>>> perhaps, an invisible character that pyWin ignores.
>>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>>> that destroys the dialog.
>>>>> Well you have to remember that you are trying to run a windowed GUI
>>>>> under the control of another windows GUI, so it isn't surprising that
>>>>> you hit trouble.
>>>>> With IDLE the issue will be that IDLE already created a main window
>>>>> before your program started running. With PythonWin you are using two
>>>>> different toolkits, so it isn't really surprising that breaks down -
>>>>> there will be two entirely separate main loops competing with each other.
>>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>>> The two separate loops being PyWin (which uses MFC) and your program
>>> (which uses Tkinter). You just can't mix GUIs in the same process like
>>> that, sorry.
>>> regards
>>>  Stedve
>> I have no idea what MFC is or how it relates to Tkinter. Neither IDLE and
>> pyWin are being run together.
>>
>> Assume neither is running.
>> a. run IDLE, and execute program
>> b. close IDLE script, and interactive window. Kill py program
>> result: boom
>> c. run pyWin and execute program
>> d. do same as b for pyWin
>> resulst: all OK
>> e. repeat a and b.
>> Result: boom
>>
>> Repeat the above and you get the same results.
>>
>> I had running IDLE successfully w/o using Pywin, and IDLE goofed, as above.
>> I switched to it to see if it work there. It did. I double clicked on the py
>> file, and it worked fine. Can you explain this?
>>
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> What Steve (and I) are saying is that IDLE has it's own mainloop and
> your program has a mainloop too as it sounds like it is running a
> Tkinter app. Sometimes when you run a Tk app from another Tk app, the
> two mainloops clash and have weird issue like this one.
> 
> If you just double-click it or run it from the command line, you only
> have one mainloop (i.e. the one that's part of your app). Thus, no
> conflicts.
> 
> Mike
So, how do I get rid of it? reboot?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From martin at v.loewis.de  Wed Feb 11 18:30:07 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Thu, 12 Feb 2009 00:30:07 +0100
Subject: Unicode issue on Windows cmd line
In-Reply-To: <173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
Message-ID: <49935F7F.5070508@v.loewis.de>

> Thanks, I ended up using encode('iso-8859-15', "replace")
> Perhaps more up to date than cp1252...??
> 
> It still didn't print correctly, but it did write correctly, which was
> my main problem.

If you encode as iso-8859-15, but this is not what your terminal
expects, it certainly won't print correctly. To get correct printing,
the output encoding must be the same as the terminal encoding. If the
terminal encoding is not up to date (as you consider cp1252), then
the output encoding should not be up to date, either.

If you want a modern encoding that supports all of Unicode, and you
don't care whether the output is legible, use UTF-8.

Regards,
Martin


From clp2 at rebertia.com  Wed Feb 11 18:30:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 11 Feb 2009 15:30:53 -0800
Subject: Can I 'LOOK' through urllib?
In-Reply-To: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <50697b2c0902111530x5d3c827fy5731d6a100aa0529@mail.gmail.com>

On Wed, Feb 11, 2009 at 3:17 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I feel good after played urllib with fun!
>
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

No such functionality exists in raw HTTP (i.e. there's no LIST verb
like there is a GET verb), so it's not like Python is erroneously
leaving something out.
You either need cooperation from the server (i.e. it exposes some URL
that gives you `ls`-like output) or the filenames and/or directory
structure need to have some guessable pattern to them so that you can
just run thru the possibilities manually.
So, what you're asking for is impossible in the general case.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From http  Wed Feb 11 18:35:07 2009
From: http (Paul Rubin)
Date: 11 Feb 2009 15:35:07 -0800
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <7xy6wca6ok.fsf@ruckus.brouhaha.com>

Muddy Coder <cosmo_general at yahoo.com> writes:
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

That is done on the server side, and only if the server operator wants
to let you look at the filenames (which is not always).  See for example:

  http://httpd.apache.org/docs/2.2/mod/mod_autoindex.html


From rhodri at wildebst.demon.co.uk  Wed Feb 11 18:53:33 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 11 Feb 2009 23:53:33 -0000
Subject: re.sub and named groups
In-Reply-To: <bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>
References: <4c7158d2-5663-46b9-b950-be81bd79964c@z6g2000pre.googlegroups.com>
	<bb8a7b1d-b0e8-41be-a206-7c0ceaf3fd73@l16g2000yqo.googlegroups.com>
Message-ID: <op.uo7onjf7a8ncjz@gnudebst>

On Wed, 11 Feb 2009 21:05:53 -0000, Paul McGuire <ptmcg at austin.rr.com>  
wrote:

> On Feb 4, 10:51?am, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
>> Hi everybody,
>>
>> I'm having a ball with the power of regular expression
>
> Don't forget the ball you can have with the power of ordinary Python
> strings, string methods, and string interpolation!

So the moral of this story is take a ball of strings with you for
when you get lost in regular expressions.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From lists at cheimes.de  Wed Feb 11 18:57:00 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 00:57:00 +0100
Subject: Can I 'LOOK' through urllib?
In-Reply-To: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <gmvokc$mbm$1@ger.gmane.org>

Muddy Coder schrieb:
> Hi Folks,
> 
> I feel good after played urllib with fun!
> 
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder. I wish urllib
> would have a function to let me do it, as well as I do 'dir' in DOS,
> 'ls' on unix/linux. Somebody write me a demo? Thanks!

The WebDAV [1] extension to the HTTP protocol supports the desired
feature. Are you able to teach your webserver WebDAV by any chance? All
major HTTP server have plugins for WebDAV.

Christian

[1] http://en.wikipedia.org/wiki/Webdav



From grante at visi.com  Wed Feb 11 19:28:56 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 11 Feb 2009 18:28:56 -0600
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
Message-ID: <w_ydnU7Zq7rV8A7UnZ2dnUVZ_srinZ2d@posted.usinternet>

On 2009-02-11, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> I feel good after played urllib with fun!
>
> Now I want to LOOK to server through urllib. I read the urllib docs,
> but I did not find such a function. For example, if there are many
> files located in http://www.somedomain.com/data_folder, but I don't
> know what the filenames are residing in the data_folder.

Try a GET on http://www.somedomain.com/.  If the admin has
indexing enabled, you should get something like "ls" output.

If not, you're out of luck.

> I wish urllib would have a function to let me do it, as well
> as I do 'dir' in DOS, 'ls' on unix/linux.

I wish I was 20 years younger and ten times as rich as I am.

> Somebody write me a demo?

Somebody send me a time machine and a pile of cash?

On second thought, don't bother with the cash -- with a time
machine, I can generate my own pile of cash.

-- 
Grant



From grante at visi.com  Wed Feb 11 19:34:03 2009
From: grante at visi.com (Grant Edwards)
Date: Wed, 11 Feb 2009 18:34:03 -0600
Subject: Can I 'LOOK' through urllib?
References: <2c1dc513-977d-4796-8c5e-118619ef3ae2@v19g2000yqn.googlegroups.com>
	<w_ydnU7Zq7rV8A7UnZ2dnUVZ_srinZ2d@posted.usinternet>
Message-ID: <w_ydnUjZq7rm8w7UnZ2dnUVZ_srinZ2d@posted.usinternet>

On 2009-02-12, Grant Edwards <grante at visi.com> wrote:
> On 2009-02-11, Muddy Coder <cosmo_general at yahoo.com> wrote:
>> Hi Folks,
>>
>> I feel good after played urllib with fun!
>>
>> Now I want to LOOK to server through urllib. I read the urllib docs,
>> but I did not find such a function. For example, if there are many
>> files located in http://www.somedomain.com/data_folder, but I don't
>> know what the filenames are residing in the data_folder.
>
> Try a GET on http://www.somedomain.com/.  If the admin has

Oops.  Should have been GET on http://www.somedomain.com/data_folder/

-- 
Grant



From darwin at nowhere.com  Wed Feb 11 19:44:14 2009
From: darwin at nowhere.com (Carbon Man)
Date: Thu, 12 Feb 2009 11:44:14 +1100
Subject: Embed a web browser into a page
Message-ID: <gmvrd4$1njp$1@news.ett.com.ua>

Hi,
I need to embed a web browser into a python page. I am coming from the MS 
world where I created an app that all of it's interfaces were actually web 
pages rendered in an Internet Explorer activex control. There was a object 
hook that allowed you to call into the host environment from javascript. 
Basically the host environment would receive the documentComplete event and 
call a method in the document's Javascript passing in an object reference. 
That reference would then be available for calls to be made from Javascript 
back into the host environment.
I am just starting to explore the Pythonic programming jungle and I was 
wondering if there is a way to do something similar that would work 
cross-platform?
I guess there is much more complexity in it when you start to go across o/s 
platform boundaries. The common web interface would then be Gecko or WebKit?
So can someone suggest what would be required to build a cross-platform 
Python app that was capable of browsing HTML files, receiving events from 
the browser, and that allows the embedded page to call host Python modules 
from Javascript via an object reference? Or I am asking too much :) 




From markus.schreyer at gmail.com  Wed Feb 11 19:49:48 2009
From: markus.schreyer at gmail.com (Markus Schreyer)
Date: Thu, 12 Feb 2009 01:49:48 +0100
Subject: ANN: Python 2.6 Quick Reference available
In-Reply-To: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
Message-ID: <dc20438f0902111649h748c3db1ya68916916f37f85b@mail.gmail.com>

Great stuff!
Waiting for the 3.0 version.. :)
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From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 11 19:53:22 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 00:53:22 GMT
Subject: urllib2.Request:: http Request sending successfully, but Response 
	contains in valid data.
References: <6119b5e5-a500-48f4-9e9d-51a0974c2c66@n33g2000pri.googlegroups.com>
Message-ID: <pan.2009.02.12.00.53.24@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 01:56:19 -0800, nRk wrote:

> Hi
> 
> I am trying to send Data to a website through "http" using
> "urllib.request" library using the bellow code. Response status code
> contains. 200 (OK) but Response contains nothing...

No it doesn't, you say so later: it contains a set of bare <HTML></HTML> 
tags. That's not the same as nothing.

> 
> With same data When I test using C# it working fine.. Response having..
> some data in xml format.
> But I am using below python code i am getting response only "<HTML></
> HTML>".
> 
> Is there any in my code..
> 
>  req  = urllib2.Request(url) // url is valid url

This is not your real code.

>>> import urllib2
>>> req  = urllib2.Request(url) // url is valid url
  File "<stdin>", line 1
    req  = urllib2.Request(url) // url is valid url
                                                  ^
SyntaxError: invalid syntax


How do you expect us to find bugs in your code when you don't show us 
your real code? Are we supposed to be mind-readers?


Try using the same user-agent string as your C# code uses, and see if the 
server changes what it sends.



-- 
Steven


From python at bdurham.com  Wed Feb 11 19:54:18 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 11 Feb 2009 19:54:18 -0500
Subject: ANN: Python 2.6 Quick Reference available
In-Reply-To: <ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
Message-ID: <1234400058.4012.1299898597@webmail.messagingengine.com>

Richard,

An excellent tool. Great job!!!

Thank you for sharing this with the Python community.

Regards,
Malcolm


From dan at puddle.net.au  Wed Feb 11 19:57:20 2009
From: dan at puddle.net.au (Dan McKenzie)
Date: Thu, 12 Feb 2009 10:57:20 +1000
Subject: SQL error
Message-ID: <41D70633-6A08-41E2-B385-A1ED7B781B4F@puddle.net.au>

Hi Guys,

I am trying to move data from a file into our mysql database.

The format of the text file is - ipaddress ipaddress bytes packets  
interface-in interface-out eg: 192.168.1.1 192.168.1.2 1522 12 * rob

The sql table is 'ipflows'

This is the code:
____________________________________________________________

#!/usr/bin/python

host    = 'localhost'
user    = 'username'
passwd  = 'password'
dbname  = 'databasename'

import MySQLdb

conn = MySQLdb.connect(host =   host,
                       user =   user,
                       passwd = passwd,
                       db =     dbname)

cursor = conn.cursor()

file = open ('ipflow.txt',"r")

for line in file:
  data = line.split()
  if not line: break
  query = '''INSERT INTO ipflows (to,from,bytes,packets) VALUES  
("%s","%s","%s","%s","%s","%s"))''' %  
(data[0],data[1],data[2],data[3],data[4],data[5])
  cursor.execute(query)
file.close()

cursor.close()
conn.commit()
conn.close()
__________________________________________________________


It is returning and error:

Traceback (most recent call last):
  File "./process_ipflow.py", line 23, in <module>
    cursor.execute(query)
  File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line  
166, in execute
    self.errorhandler(self, exc, value)
  File "/var/lib/python-support/python2.5/MySQLdb/connections.py",  
line 35, in defaulterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.ProgrammingError: (1064, 'You have an error in your  
SQL syntax; check the manual that corresponds to your MySQL server  
version for the right syntax to use near \'to,from,bytes,packets)  
VALUES ("192.168.1.1","192.168.1.2","1522","12","*","\' at line 1')

Seems I have the sql syntax wrong but I can't seem to find the answer :(

Any help would be appreciated.

Regards,

Dan





Regards,

Dan McKenzie
Puddlenet
Community Broadband Networks
Brisbane, Australia Q4074
+61 (0) 407 622 557
+61 (0) 7 3376 8539







From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 11 19:57:34 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 00:57:34 GMT
Subject: Unexpected string behaviour: txt = 'this' ' works'
References: <gmubfn$a28$1@heffalump.dur.ac.uk>
	<f136d22c-e226-4f62-8fdf-4518e7f5f0f6@w34g2000yqm.googlegroups.com>
	<ac5c1847-7e98-46ee-a620-7afab47a95ab@w39g2000prb.googlegroups.com>
	<71e3e031-de35-4f7b-91e9-1c14436d36f1@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.12.00.57.35@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 12:57:31 -0800, bearophileHUGS wrote:

> Jason:
>> It's such a minor optimization, that you probably wouldn't see any
>> effect on your program.
> 
>>>> from dis import dis
>>>> def f():
> ...  return 'This is ' + 'an example.' ...
>>>> dis(f)
>   2           0 LOAD_CONST               3 ('This is an example.')
>               3 RETURN_VALUE


That's a feature of the CPython keyhole optimizer, not a language 
feature. I expect that if you try that same thing in various other 
Pythons (and earlier versions of CPython) you'll get a different result. 
And like all optimizations, it's not a language feature, it's subject to 
removal without notice if necessary.

If you want guaranteed implicit concatenation, you need to leave out the 
plus operator. That is a language feature.

And I do call it a feature. I find it useful, and I've never run into any 
bugs caused by it, and if I did, I expect they would show up quickly:

x = "foo", "bar"
y = "foo" "bar"

x is a tuple of length 2, y is a string of length 6. You'll soon notice 
the difference. Since it only effects literals, it should be easy enough 
to find.




-- 
Steven


From jeffgemail at gmail.com  Wed Feb 11 20:11:37 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 17:11:37 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
Message-ID: <0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>

On Feb 11, 6:30?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Thanks, I ended up using encode('iso-8859-15', "replace")
> > Perhaps more up to date than cp1252...??
>
> > It still didn't print correctly, but it did write correctly, which was
> > my main problem.
>
> If you encode as iso-8859-15, but this is not what your terminal
> expects, it certainly won't print correctly. To get correct printing,
> the output encoding must be the same as the terminal encoding. If the
> terminal encoding is not up to date (as you consider cp1252), then
> the output encoding should not be up to date, either.
>
> If you want a modern encoding that supports all of Unicode, and you
> don't care whether the output is legible, use UTF-8.
>
> Regards,
> Martin

I did try UTF-8 but it produced the upper case character instead of
the proper lower case, so the output was incorrect for the unicode
supplied.
I think both 8859-15 and cp1252 produced the correct output, but I
figured 8859-15 would have additional character support (though not
sure this is the case - if it is not, please let me know and I'll use
1252).  I'm dealing with large data sets and this just happend to be
one small example.  I want to have the best ability to write future
unicode characters properly based on running from the windows command
line (unless there is a better way to do it on windows).


From sjmachin at lexicon.net  Wed Feb 11 20:16:33 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 11 Feb 2009 17:16:33 -0800 (PST)
Subject: SQL error
References: <mailman.9372.1234400254.3487.python-list@python.org>
Message-ID: <4a601628-a598-4766-a3e2-68d7bb5a3003@a39g2000prl.googlegroups.com>

On Feb 12, 11:57?am, Dan McKenzie <d... at puddle.net.au> wrote:
> Hi Guys,
>
> I am trying to move data from a file into our mysql database.
>
> The format of the text file is - ipaddress ipaddress bytes packets ?
> interface-in interface-out eg: 192.168.1.1 192.168.1.2 1522 12 * rob
>
> The sql table is 'ipflows'
>
> This is the code:
> ____________________________________________________________
>
> #!/usr/bin/python
>
> host ? ?= 'localhost'
> user ? ?= 'username'
> passwd ?= 'password'
> dbname ?= 'databasename'
>
> import MySQLdb
>
> conn = MySQLdb.connect(host = ? host,
> ? ? ? ? ? ? ? ? ? ? ? ?user = ? user,
> ? ? ? ? ? ? ? ? ? ? ? ?passwd = passwd,
> ? ? ? ? ? ? ? ? ? ? ? ?db = ? ? dbname)
>
> cursor = conn.cursor()
>
> file = open ('ipflow.txt',"r")
>
> for line in file:
> ? data = line.split()
> ? if not line: break

The above line of code is redundant; it can't happen; "line" will
never be "false".

> ? query = '''INSERT INTO ipflows (to,from,bytes,packets) VALUES ?
> ("%s","%s","%s","%s","%s","%s"))''' % ?

You have 6 values but only 4 column names ... looks a bit suss to me.

> (data[0],data[1],data[2],data[3],data[4],data[5])

Ummm .. why not just
   data
instead of
   (data[0],data[1],data[2],data[3],data[4],data[5])
?

> ? cursor.execute(query)
> file.close()
>
> cursor.close()
> conn.commit()
> conn.close()
> __________________________________________________________
>
> It is returning and error:
>
> Traceback (most recent call last):
> ? File "./process_ipflow.py", line 23, in <module>
> ? ? cursor.execute(query)
> ? File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line ?
> 166, in execute
> ? ? self.errorhandler(self, exc, value)
> ? File "/var/lib/python-support/python2.5/MySQLdb/connections.py", ?
> line 35, in defaulterrorhandler
> ? ? raise errorclass, errorvalue
> _mysql_exceptions.ProgrammingError: (1064, 'You have an error in your ?
> SQL syntax; check the manual that corresponds to your MySQL server ?
> version for the right syntax to use near \'to,from,bytes,packets)

TO and FROM are reserved words in just about everybody's version of
SQL. And they're not very meaningful either especially when compared
with interface_in and interface_out.

BUT I'm surprised [not being familiar with MySQL] that you were
allowed to do a CREATE TABLE with those column names.
 ?
> VALUES ("192.168.1.1","192.168.1.2","1522","12","*","\' at line 1')
>
> Dan McKenzie
> Puddlenet

whose mascot no doubt is a duck named Jemima :-)

> Community Broadband Networks
> Brisbane, Australia Q4074

Greetings from Melbourne.

Cheers,
John


From basilisk96 at gmail.com  Wed Feb 11 20:22:26 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Wed, 11 Feb 2009 17:22:26 -0800 (PST)
Subject: how can this iterator be optimized?
Message-ID: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>

Hello all,

I have the following function that uses an intermediate iterator
"rawPairs":

def MakePairs(path):
    import os
    import operator
    join = os.path.join
    rawPairs = (
        (join(path, s), func(s))
        for s in os.listdir(path)
        if func(s) is not None and func(s).endswith("some criterion")
    )
    #Use the second item in the pair as the sort criterion
    result = sorted(rawPairs, key=operator.itemgetter(1))
    return result

where "func" is a single-argument function that returns either a
string or None, but is an expensive call.
I am pretty sure that the sorted() construct cannot be improved much
further, but...
...does anyone have ideas on improving the "rawPairs" iterator so that
it calls "func(s)" only once per iteration?  Perhaps a lambda
construct, but I am not sure how to go about it...?

Cheers,
Basilisk96


From mark.seagoe at gmail.com  Wed Feb 11 20:33:23 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 17:33:23 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com> 
	<mailman.9362.1234390165.3487.python-list@python.org>
Message-ID: <5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>



Hi Gabriel;

Not sure what generic attribute container is.  I am reading in from
xml file
all reg names for a chip.  So then I'd be able to use python scripts
to
access the regs.  So eventually this class will get subclassed w/ hw
access
instead of just saving in int.  So I want to call this module
something like
"CHIP" which contains a struct.  I add the "REG" struct objects as I
read
them in from xml file.  The "REG" struct would have info about
address, # of
bits, type (RO, RW, etc).

Thx,
Mark




From gagsl-py2 at yahoo.com.ar  Wed Feb 11 20:38:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 11 Feb 2009 23:38:56 -0200
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <op.uo7ti6bxx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 23:22:26 -0200, Basilisk96 <basilisk96 at gmail.com>  
escribi?:

> def MakePairs(path):
>     import os
>     import operator
>     join = os.path.join
>     rawPairs = (
>         (join(path, s), func(s))
>         for s in os.listdir(path)
>         if func(s) is not None and func(s).endswith("some criterion")
>     )
>     #Use the second item in the pair as the sort criterion
>     result = sorted(rawPairs, key=operator.itemgetter(1))
>     return result
>
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration?  Perhaps a lambda
> construct, but I am not sure how to go about it...?

Don't use a generator then. If you're going to finally return a list (and  
sorted does exactly that), build a list right from the start:

def MakePairs(path):
     join = os.path.join
     result = []
     append = result.append
     for s in os.listdir(path):
         key = func(s)
         if key is not None and key.endswith("some criterion"):
             append((join(path, s), key))
     #Use the second item in the pair as the sort criterion
     result.sort(key=operator.itemgetter(1))
     return result

-- 
Gabriel Genellina



From shandy.b at gmail.com  Wed Feb 11 20:47:00 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 11 Feb 2009 17:47:00 -0800 (PST)
Subject: CPython loading modules into memory
References: <dfe72066-e962-4c31-a0dc-4a1a982f341f@v18g2000pro.googlegroups.com>
	<49934A78.10309@v.loewis.de>
Message-ID: <b86f1f05-6f6a-4589-9ed0-4b68bf1fd3c4@d36g2000prf.googlegroups.com>

On Feb 11, 2:00?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > Can someone describe the details of how Python loads modules into
> > memory? ?I assume once the .py file is compiled to .pyc that it is
> > mmap'ed in. ?But that assumption is very naive. ?Maybe it uses an
> > anonymous mapping? ?Maybe it does other special magic? ?This is all
> > very alien to me, so if someone could explain it in terms that a
> > person who never usually worries about memory could understand, that
> > would be much appreciated.
>
> There is no magic whatsoever. Python opens a sequential file descriptor
> for the .pyc file, and then reads it in small chunks, "unmarshalling"
> it (indeed, the marshal module is used to restore Python objects).
>
> The marshal format is an object serialization in a type-value encoding
> (sometimes type-length-value), with type codes for:
> - None, True, False
> - 32-bit ints, 64-bit ints (unmarshalled into int/long)
> - floats, complex
> - arbitrary-sized longs
> - strings, unicode
> - tuples (length + marshal data of values)
> - lists
> - dicts
> - code objects
> - a few others
>
> Result of unmarshalling is typically a code object.
>
> > Follow up: is this process different if the modules are loaded from a
> > zipfile?
>
> No; it uncompresses into memory, and then unmarshals from there (
> compressed block for compressed block)
>
> > If there is a link that covers this info, that'd be great too.
>
> See the description of the marshal module.
>
> HTH,
> Martin


Thanks for the answers.  For my own edification, and in case anyone is
interested, I confirmed this by looking at import.c and marshal.c in
the Python2.5.4 source.  Looks like the actual reading of the file is
done in the marshal.c function PyMarshal_ReadLastObjectFromFile.  It
is read sequentially using a small buffer on the heap.

-sjbrown


From jeffgemail at gmail.com  Wed Feb 11 20:48:55 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 17:48:55 -0800 (PST)
Subject: Another optimization request :-)
Message-ID: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>

If anyone wants to take this on... I would really really like to have
the spring_layout modified to support multi-threading if at all
possible.
My test data is 20,000, which makes this process 20,000 x 20,000 or
400,000,000 (400 million) calculations.  This is taking somewhere
between 2-3 hours an iteration.
I plan to plot out over 1,000,000 data points or more, which would put
this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
making this more efficient would be much appreciated.

def spring_layout(G, iterations=50, dim=2, node_pos=None,
verbose=False):
    """Spring force model layout"""
    if node_pos==None :  # set the initial positions randomly in 1x1
box
        vpos=random_layout(G, dim=dim)
    else:
        vpos=node_pos
    if iterations==0:
        return vpos
    if G.order()==0:
        k=1.0
    else:
        k=N.sqrt(1.0/G.order()) # optimal distance between nodes
    disp={}         # displacements

    # initial "temperature" (about .1 of domain area)
    # this is the largest step allowed in the dynamics
    # linearly step down by dt on each iteration so
    # on last iteration it is size dt.
    t=0.1
    dt=0.1/float(iterations+1)
    for i in range(0,iterations):
        for v in G:
            if verbose==True:
                print("Interation: " + str(i + 1) + ", Calculating: "
+ str(v.encode('iso-8859-15', "replace")))
            disp[v]=N.zeros(dim)
            for u in G:
                delta=vpos[v]-vpos[u]
                dn=max(sqrt(N.dot(delta,delta)),0.01)
                # repulsive force between all
                deltaf=delta*k**2/dn**2
                disp[v]=disp[v]+deltaf
                # attractive force between neighbors
                if G.has_edge(v,u):
                    deltaf=-delta*dn**2/(k*dn)
                    disp[v]=disp[v]+deltaf

        # update positions
        for v in G:
            l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
            vpos[v]=vpos[v]+ disp[v]*t/l
        t-=dt
    return vpos


From bj_666 at gmx.net  Wed Feb 11 20:51:47 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 12 Feb 2009 01:51:47 GMT
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
Message-ID: <6vhdljFju0haU1@mid.uni-berlin.de>

On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:

> Not sure what generic attribute container is.  I am reading in from xml
> file all reg names for a chip.

Are you using instances of that class to interface C code or to read/
write data intended to be read or written by a C program?  If not then 
`ctypes` might be the wrong tool.

Ciao,
	Marc 'BlackJack' Rintsch


From drobinow at gmail.com  Wed Feb 11 20:59:20 2009
From: drobinow at gmail.com (drobinow at gmail.com)
Date: Wed, 11 Feb 2009 17:59:20 -0800 (PST)
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org> 
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
Message-ID: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>

On Feb 11, 2:51?pm, Steve Holden <st... at holdenweb.com> wrote:
> W. eWatson wrote:
> > Steve Holden wrote:
> >> W. eWatson wrote:
> >>> My program in IDLE bombed with:
> >>> ==============
> >>> Exception in Tkinter callback
> >>> Traceback (most recent call last):
> >>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> >>> ? ? return self.func(*args)
> >>> ? File
> >>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>> line 552, in OperationalSettings
> >>> ? ? dialog = OperationalSettingsDialog( self.master, set_loc_dict )
> >>> ? File
> >>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>
> >>> line 81, in __init__
> >>> ? ? tkSimpleDialog.Dialog.__init__(self, parent)
> >>> ? File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
> >>> ? ? self.wait_visibility() # window needs to be visible for the grab
> >>> ? File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
> >>> ? ? self.tk.call('tkwait', 'visibility', window._w)
> >>> TclError: window ".34672232" was deleted before its visibility changed
> >>> ===============
> >>> It runs fine in pythonWin performing the same entry operation. Open a
> >>> menu, ?select an item to open a dialog, select a select button in the
> >>> dialog, press OK to leave the dialog. Boom, as above.
>
> >>> (This does not mean pythonWin doesn't have problems of its own. ) If I
> >>> just execute the code (double click on the py file, the console shows no
> >>> problems. IDLE is unhappy.
>
> >>> Another side to this is that I use WinMerge to find differences between
> >>> my last saved copy and the current copy. I found the current copy had
> >>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
> >>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
> >>> had no trouble executing the program. My guess is that while briefly
> >>> editing there, I hit some odd combination of keys that produced,
> >>> perhaps, an invisible character that pyWin ignores.
>
> >>> Not the 34672232 window is a dialog that I closed by pressing OK. I
> >>> would again guess, that, if there is a problem, it occurs in the code
> >>> that destroys the dialog.
>
> >> Well you have to remember that you are trying to run a windowed GUI
> >> under the control of another windows GUI, so it isn't surprising that
> >> you hit trouble.
>
> >> With IDLE the issue will be that IDLE already created a main window
> >> before your program started running. With PythonWin you are using two
> >> different toolkits, so it isn't really surprising that breaks down -
> >> there will be two entirely separate main loops competing with each other.
>
> > Not quite. I take down IDLE when I run pyWin, and vice versa.
>
> The two separate loops being PyWin (which uses MFC) and your program
> (which uses Tkinter). You just can't mix GUIs in the same process like
> that, sorry.
>
> regards
> ?Stedve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Deja-vu!

http://mail.python.org/pipermail/python-list/2001-March/076069.html


From mark.seagoe at gmail.com  Wed Feb 11 21:02:12 2009
From: mark.seagoe at gmail.com (mark.seagoe at gmail.com)
Date: Wed, 11 Feb 2009 18:02:12 -0800 (PST)
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com> 
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
	<6vhdljFju0haU1@mid.uni-berlin.de>
Message-ID: <defd1101-4e47-4fd3-a050-c97bd2015bf3@r36g2000prf.googlegroups.com>

On Feb 11, 5:51?pm, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
> On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:
> > Not sure what generic attribute container is. ?I am reading in from xml
> > file all reg names for a chip.
>
> Are you using instances of that class to interface C code or to read/
> write data intended to be read or written by a C program? ?If not then
> `ctypes` might be the wrong tool.
>
> Ciao,
> ? ? ? ? Marc 'BlackJack' Rintsch

It's accessing through USB so I'm also interfacing to Win32 drivers.
But at this higher level, since I'm somewhat new to Python so I'm not
aware of other classes which exist to allow accessing in the format
desired (without quotes and using dot notation):
classname.elementname1, instead of something like classname
["elementname1"].  It's just cosmetic, but I'd prefer the dot notation
without quotes for the end user experience of script writing later.
Is there something besides ctypes.Structure that would do that?

Thx,
Mark


From andrew at acooke.org  Wed Feb 11 21:44:10 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 23:44:10 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>


why are you dong this point by point?  surely you can express the physics
as a set of equations and invert the matrix?  wouldn't that be a lot
faster?  you'd replace the iteration over all combinations of points with
a faster matrix inversion.

see for example
http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdf page 331
onwards.

there's a very nice into to the verlet integration mentioned here -
http://teknikus.dk/tj/gdc2001.htm

andrew


jeffg wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.
> My test data is 20,000, which makes this process 20,000 x 20,000 or
> 400,000,000 (400 million) calculations.  This is taking somewhere
> between 2-3 hours an iteration.
> I plan to plot out over 1,000,000 data points or more, which would put
> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
> making this more efficient would be much appreciated.
>
> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> verbose=False):
>     """Spring force model layout"""
>     if node_pos==None :  # set the initial positions randomly in 1x1
> box
>         vpos=random_layout(G, dim=dim)
>     else:
>         vpos=node_pos
>     if iterations==0:
>         return vpos
>     if G.order()==0:
>         k=1.0
>     else:
>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>     disp={}         # displacements
>
>     # initial "temperature" (about .1 of domain area)
>     # this is the largest step allowed in the dynamics
>     # linearly step down by dt on each iteration so
>     # on last iteration it is size dt.
>     t=0.1
>     dt=0.1/float(iterations+1)
>     for i in range(0,iterations):
>         for v in G:
>             if verbose==True:
>                 print("Interation: " + str(i + 1) + ", Calculating: "
> + str(v.encode('iso-8859-15', "replace")))
>             disp[v]=N.zeros(dim)
>             for u in G:
>                 delta=vpos[v]-vpos[u]
>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>                 # repulsive force between all
>                 deltaf=delta*k**2/dn**2
>                 disp[v]=disp[v]+deltaf
>                 # attractive force between neighbors
>                 if G.has_edge(v,u):
>                     deltaf=-delta*dn**2/(k*dn)
>                     disp[v]=disp[v]+deltaf
>
>         # update positions
>         for v in G:
>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>             vpos[v]=vpos[v]+ disp[v]*t/l
>         t-=dt
>     return vpos
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From david.birdsong at gmail.com  Wed Feb 11 21:44:53 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 18:44:53 -0800 (PST)
Subject: select.poll.poll() never blocks
Message-ID: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>

I'm pretty sure I've exhausted all searches and read all the forums
Google will turn up related to this issue.

I touch an empty file in a sh shell, fire up the python shell, open
the file for reading(tried all buffering options), register it with a
poll object for select.POLLIN and call poll(), but the poll never
blocks and always returns for the FD, EVENT combination I ask for, but
the file has not anything written to it.

Here's an example snippet:
>>> fd = os.open('/tmp/poll_test', os.O_RDONLY | os.O_SYNC)
>>> p = select.poll()
>>> p.register(fd, select.POLLIN)
>>> s = p.poll()
>>> os.read(fd, 10)
''
>>> s
[(3, 1)]
>>> fd
3

I was using the open builtin originally, but a forum I read suggested
that this created user level buffers that the system call wouldn't
know about(which didn't completely jive with me), so I switched to the
lower level os.open.

Am I not getting the proper spirit of select.poll?  I know that read()
never blocks and I think I read somewhere that poll will return fd
that will not block for the EVENT registered -so in that regard it's
fitting.

Any help on what I'm missing would be appreciated.


From exarkun at divmod.com  Wed Feb 11 21:49:09 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 11 Feb 2009 21:49:09 -0500
Subject: select.poll.poll() never blocks
In-Reply-To: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
Message-ID: <20090212024909.12853.309763852.divmod.quotient.9093@henry.divmod.com>

On Wed, 11 Feb 2009 18:44:53 -0800 (PST), birdsong <david.birdsong at gmail.com> wrote:
>I'm pretty sure I've exhausted all searches and read all the forums
>Google will turn up related to this issue.
>
>I touch an empty file in a sh shell, fire up the python shell, open
>the file for reading(tried all buffering options), register it with a
>poll object for select.POLLIN and call poll(), but the poll never
>blocks and always returns for the FD, EVENT combination I ask for, but
>the file has not anything written to it.

Filesystem files are always reported as readable and writeable by select,
poll, epoll, etc.

If you want to do non-blocking filesystem I/O, your choices are to use a
native thread (Python's threading module, or another third-party module
which wraps the platform thread API) or to use POSIX AIO (or the mildly
incompatible Linux variant.  Of course, AIO has tons of caveats and is
generally in a miserable state, so you probably shouldn't use it.  That
leaves you with threads.

Jean-Paul


From andrew at acooke.org  Wed Feb 11 21:56:52 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 11 Feb 2009 23:56:52 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
Message-ID: <0fbde7b4d61078a9c7cda67e0b3bfbbb.squirrel@acooke.dyndns.org>


sorry, that was stupid.  there is no inversion (apart from 1/m), just the
integration.

still, improving the integration would allow larger steps.

andrew



andrew cooke wrote:
>
> why are you dong this point by point?  surely you can express the physics
> as a set of equations and invert the matrix?  wouldn't that be a lot
> faster?  you'd replace the iteration over all combinations of points with
> a faster matrix inversion.
>
> see for example
> http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdf page 331
> onwards.
>
> there's a very nice into to the verlet integration mentioned here -
> http://teknikus.dk/tj/gdc2001.htm
>
> andrew
>
>
> jeffg wrote:
>> If anyone wants to take this on... I would really really like to have
>> the spring_layout modified to support multi-threading if at all
>> possible.
>> My test data is 20,000, which makes this process 20,000 x 20,000 or
>> 400,000,000 (400 million) calculations.  This is taking somewhere
>> between 2-3 hours an iteration.
>> I plan to plot out over 1,000,000 data points or more, which would put
>> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
>> making this more efficient would be much appreciated.
>>
>> def spring_layout(G, iterations=50, dim=2, node_pos=None,
>> verbose=False):
>>     """Spring force model layout"""
>>     if node_pos==None :  # set the initial positions randomly in 1x1
>> box
>>         vpos=random_layout(G, dim=dim)
>>     else:
>>         vpos=node_pos
>>     if iterations==0:
>>         return vpos
>>     if G.order()==0:
>>         k=1.0
>>     else:
>>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>>     disp={}         # displacements
>>
>>     # initial "temperature" (about .1 of domain area)
>>     # this is the largest step allowed in the dynamics
>>     # linearly step down by dt on each iteration so
>>     # on last iteration it is size dt.
>>     t=0.1
>>     dt=0.1/float(iterations+1)
>>     for i in range(0,iterations):
>>         for v in G:
>>             if verbose==True:
>>                 print("Interation: " + str(i + 1) + ", Calculating: "
>> + str(v.encode('iso-8859-15', "replace")))
>>             disp[v]=N.zeros(dim)
>>             for u in G:
>>                 delta=vpos[v]-vpos[u]
>>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>>                 # repulsive force between all
>>                 deltaf=delta*k**2/dn**2
>>                 disp[v]=disp[v]+deltaf
>>                 # attractive force between neighbors
>>                 if G.has_edge(v,u):
>>                     deltaf=-delta*dn**2/(k*dn)
>>                     disp[v]=disp[v]+deltaf
>>
>>         # update positions
>>         for v in G:
>>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>>             vpos[v]=vpos[v]+ disp[v]*t/l
>>         t-=dt
>>     return vpos
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From gagsl-py2 at yahoo.com.ar  Wed Feb 11 22:00:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 12 Feb 2009 01:00:45 -0200
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
	<0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>
Message-ID: <op.uo7xbjjhx6zn5v@gabriel2.softlabbsas.com.ar>

En Wed, 11 Feb 2009 23:11:37 -0200, jeffg <jeffgemail at gmail.com> escribi?:
> On Feb 11, 6:30?pm, "Martin v. L?wis" <mar.. at v.loewis.de> wrote:

>> > Thanks, I ended up using encode('iso-8859-15', "replace")
>> > Perhaps more up to date than cp1252...??
>> If you encode as iso-8859-15, but this is not what your terminal
>> expects, it certainly won't print correctly. To get correct printing,
>> the output encoding must be the same as the terminal encoding. If the
>> terminal encoding is not up to date (as you consider cp1252), then
>> the output encoding should not be up to date, either.
> I did try UTF-8 but it produced the upper case character instead of
> the proper lower case, so the output was incorrect for the unicode
> supplied.
> I think both 8859-15 and cp1252 produced the correct output, but I
> figured 8859-15 would have additional character support (though not
> sure this is the case - if it is not, please let me know and I'll use
> 1252).  I'm dealing with large data sets and this just happend to be
> one small example.  I want to have the best ability to write future
> unicode characters properly based on running from the windows command
> line (unless there is a better way to do it on windows).

As Martin v. L?wis already said, the encoding used by Python when writing  
to the console, must match the encoding the console expects. (And you also  
should use a font capable of displaying such characters).

windows-1252 and iso-8859-15 are similar, but not identical. This table  
shows the differences (less than 30 printable characters):  
http://en.wikipedia.org/wiki/Western_Latin_character_sets_(computing)
If your script encodes its output using iso-8859-15, the corresponding  
console code page should be 28605.
"Western European" (whatever that means exactly) Windows versions use the  
windows-1252 encoding as the "Ansi code page" (GUI applications), and  
cp850 as the "OEM code page" (console applications) -- cp437 in the US  
only.

C:\Documents and Settings\Gabriel>chcp 1252
Tabla de c?digos activa: 1252

C:\Documents and Settings\Gabriel>python
Python 2.6 (r26:66721, Oct  2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)]  
on win
32
Type "help", "copyright", "credits" or "license" for more information.
py> unichr(0x0153).encode("windows-1252")
'\x9c'
py> print _
?
py> ^Z

C:\Documents and Settings\Gabriel>chcp 28605
Tabla de c?digos activa: 28605

C:\Documents and Settings\Gabriel>python
Python 2.6 (r26:66721, Oct  2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)]  
on win
32
Type "help", "copyright", "credits" or "license" for more information.
py> unichr(0x0153).encode("iso-8859-15")
'\xbd'
py> print _
?
py> unichr(0x0153).encode("latin9")
'\xbd'

-- 
Gabriel Genellina



From david.birdsong at gmail.com  Wed Feb 11 22:01:16 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 19:01:16 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <mailman.9375.1234406953.3487.python-list@python.org>
Message-ID: <e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>

So I guess I didn't have a complete understanding of poll, I thought
it returned file descriptors that had registered an event that the
user asked to watch for.  In my case, select.POLLIN
Constant 	Meaning
POLLIN 	There is data to read

...there ins't any data to be read.  The file is readable, yes, but is
that all that the syscall has to offer?


On Feb 11, 6:49?pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Wed, 11 Feb 2009 18:44:53 -0800 (PST), birdsong <david.birds... at gmail.com> wrote:
> >I'm pretty sure I've exhausted all searches and read all the forums
> >Google will turn up related to this issue.
>
> >I touch an empty file in a sh shell, fire up the python shell, open
> >the file for reading(tried all buffering options), register it with a
> >poll object for select.POLLIN and call poll(), but the poll never
> >blocks and always returns for the FD, EVENT combination I ask for, but
> >the file has not anything written to it.
>
> Filesystem files are always reported as readable and writeable by select,
> poll, epoll, etc.
>
> If you want to do non-blocking filesystem I/O, your choices are to use a
> native thread (Python's threading module, or another third-party module
> which wraps the platform thread API) or to use POSIX AIO (or the mildly
> incompatible Linux variant. ?Of course, AIO has tons of caveats and is
> generally in a miserable state, so you probably shouldn't use it. ?That
> leaves you with threads.
>
> Jean-Paul



From scott.bronson.nelson at gmail.com  Wed Feb 11 22:02:22 2009
From: scott.bronson.nelson at gmail.com (scott.bronson.nelson at gmail.com)
Date: Wed, 11 Feb 2009 19:02:22 -0800 (PST)
Subject: __import__ Confusion
Message-ID: <5e61a9a8-7caa-4dfc-9454-aa8eddb8e593@z1g2000yqn.googlegroups.com>

Can someone explain to me what's going on here?

>>> __import__('some.package.module', {}, {}, [])
<module 'some' from 'some/__init__.py'>
>>> __import__('some.package.module', {}, {}, [''])
<module 'some.package.module' from 'some/package/module.py'>

(Note that '' is two single quotes)

Thanks,
Scott


From gagsl-py2 at yahoo.com.ar  Wed Feb 11 22:17:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 12 Feb 2009 01:17:37 -0200
Subject: Iterable Ctypes Struct
References: <99d4c7ae-27ae-4f3a-8475-a58f1c4e6925@t26g2000prh.googlegroups.com>
	<mailman.9311.1234331580.3487.python-list@python.org>
	<002f91bd-a30a-4fbf-a757-d496cd381dbf@p23g2000prp.googlegroups.com>
	<9d48e184-5bae-4c3a-b500-d49c38913b39@r41g2000prr.googlegroups.com>
	<mailman.9362.1234390165.3487.python-list@python.org>
	<5928b28c-9ce5-4b28-a8dd-ddd749391726@y38g2000prg.googlegroups.com>
	<6vhdljFju0haU1@mid.uni-berlin.de>
	<defd1101-4e47-4fd3-a050-c97bd2015bf3@r36g2000prf.googlegroups.com>
Message-ID: <op.uo7x3ns8x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 00:02:12 -0200, <mark.seagoe at gmail.com> escribi?:
> On Feb 11, 5:51?pm, Marc 'BlackJack' Rintsch <bj_... at gmx.net> wrote:
>> On Wed, 11 Feb 2009 17:33:23 -0800, mark.seagoe wrote:

>> > Not sure what generic attribute container is. ?I am reading in from >  
>> xml file all reg names for a chip.
>>
>> Are you using instances of that class to interface C code or to read/
>> write data intended to be read or written by a C program? ?If not then
>> `ctypes` might be the wrong tool.
>
> It's accessing through USB so I'm also interfacing to Win32 drivers.
> But at this higher level, since I'm somewhat new to Python so I'm not
> aware of other classes which exist to allow accessing in the format
> desired (without quotes and using dot notation):
> classname.elementname1, instead of something like classname
> ["elementname1"].  It's just cosmetic, but I'd prefer the dot notation
> without quotes for the end user experience of script writing later.
> Is there something besides ctypes.Structure that would do that?

You don't need *anything* special to add attributes to an object in  
Python. Even an empty class is enough:

py> class Struct(object):
...   pass # an empty class
...
py> s = Struct()
py> s.x = 10
py> s.y = 20
py> print s.x, s.y
10 20
py>

But since this thread started asking how to iterate over the attributes,  
let's use a named tuple:

py> from collections import namedtuple
py> StructWithNames = namedtuple("StructWithNames", "x,y,z")
py> s = StructWithNames(10, 20, 30)
py> s.z
30
py> s
StructWithNames(x=10, y=20, z=30)
py> list(s)
[10, 20, 30]
py> for item in s: print item
...
10
20
30
py> s._fields
('x', 'y', 'z')

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Wed Feb 11 22:47:46 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 12 Feb 2009 03:47:46 -0000
Subject: select.poll.poll() never blocks
In-Reply-To: <e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
References: <mailman.9375.1234406953.3487.python-list@python.org>
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
Message-ID: <op.uo7zhwfqa8ncjz@gnudebst>

On Thu, 12 Feb 2009 03:01:16 -0000, birdsong <david.birdsong at gmail.com>  
wrote:

> So I guess I didn't have a complete understanding of poll, I thought
> it returned file descriptors that had registered an event that the
> user asked to watch for.  In my case, select.POLLIN
> Constant 	Meaning
> POLLIN 	There is data to read
>
> ...there ins't any data to be read.  The file is readable, yes, but is
> that all that the syscall has to offer?

To quote the web page referenced in help(select):

"It cannot be used on regular files to determine whether a file has grown  
since it was last read."

poll() and friends are wrappers over the socket library "poll" and
"select" functions, which primarily exist to facilitate asynchronous
socket communications.  They can take ordinary file descriptors as
well as sockets because there's no good reason not to, but a regular
file will always be ready to read as long as you haven't read past
the end of file.

You're trying to use a regular file as if it was a pipe.  My first
obvious question is do you have to do it this way?  Do you have
any control over the program writing to file?  Can you cause the
output to go to stdout and pipe it into your script's stdin
instead?  That would make your life vastly easier.

If you can't, I'm not sure what your best strategy is.  I'd
be tempted to use "tail -f filetocheck | yourscript.py" and
palm the job off on an already-written tool.  If you want to
do it in Python, the only thing that springs to mind is
periodically checking the size of the file and reading more
when that changes.  You'll need to be very careful to keep
what size you think the file is in sync with how much you've
read!

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From semanticist at gmail.com  Wed Feb 11 22:51:33 2009
From: semanticist at gmail.com (Miles)
Date: Wed, 11 Feb 2009 22:51:33 -0500
Subject: select.poll.poll() never blocks
In-Reply-To: <op.uo7zhwfqa8ncjz@gnudebst>
References: <mailman.9375.1234406953.3487.python-list@python.org>
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com>
	<op.uo7zhwfqa8ncjz@gnudebst>
Message-ID: <a49e45f50902111951v49c91f42i6679fbd0bfd6e82d@mail.gmail.com>

On Wed, Feb 11, 2009 at 10:47 PM, Rhodri James
<rhodri at wildebst.demon.co.uk> wrote:
> If you want to
> do it in Python, the only thing that springs to mind is
> periodically checking the size of the file and reading more
> when that changes.  You'll need to be very careful to keep
> what size you think the file is in sync with how much you've
> read!

See also this recipe:
http://code.activestate.com/recipes/157035/

-Miles


From notvalid2 at sbcglobal.net  Wed Feb 11 22:57:55 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:57:55 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <49939E43.6090205@sbcglobal.net>

drobinow at gmail.com wrote:
> On Feb 11, 2:51 pm, Steve Holden <st... at holdenweb.com> wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> My program in IDLE bombed with:
>>>>> ==============
>>>>> Exception in Tkinter callback
>>>>> Traceback (most recent call last):
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>     return self.func(*args)
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 552, in OperationalSettings
>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 81, in __init__
>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>> ===============
>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>> just execute the code (double click on the py file, the console shows no
>>>>> problems. IDLE is unhappy.
>>>>> Another side to this is that I use WinMerge to find differences between
>>>>> my last saved copy and the current copy. I found the current copy had
>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>> had no trouble executing the program. My guess is that while briefly
>>>>> editing there, I hit some odd combination of keys that produced,
>>>>> perhaps, an invisible character that pyWin ignores.
>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>> that destroys the dialog.
>>>> Well you have to remember that you are trying to run a windowed GUI
>>>> under the control of another windows GUI, so it isn't surprising that
>>>> you hit trouble.
>>>> With IDLE the issue will be that IDLE already created a main window
>>>> before your program started running. With PythonWin you are using two
>>>> different toolkits, so it isn't really surprising that breaks down -
>>>> there will be two entirely separate main loops competing with each other.
>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 22:58:22 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:58:22 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <49939E5E.2000309@sbcglobal.net>

drobinow at gmail.com wrote:
> On Feb 11, 2:51 pm, Steve Holden <st... at holdenweb.com> wrote:
>> W. eWatson wrote:
>>> Steve Holden wrote:
>>>> W. eWatson wrote:
>>>>> My program in IDLE bombed with:
>>>>> ==============
>>>>> Exception in Tkinter callback
>>>>> Traceback (most recent call last):
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
>>>>>     return self.func(*args)
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 552, in OperationalSettings
>>>>>     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
>>>>>   File
>>>>> "C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py",
>>>>> line 81, in __init__
>>>>>     tkSimpleDialog.Dialog.__init__(self, parent)
>>>>>   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
>>>>>     self.wait_visibility() # window needs to be visible for the grab
>>>>>   File "C:\Python25\lib\lib-tk\Tkinter.py", line 415, in wait_visibility
>>>>>     self.tk.call('tkwait', 'visibility', window._w)
>>>>> TclError: window ".34672232" was deleted before its visibility changed
>>>>> ===============
>>>>> It runs fine in pythonWin performing the same entry operation. Open a
>>>>> menu,  select an item to open a dialog, select a select button in the
>>>>> dialog, press OK to leave the dialog. Boom, as above.
>>>>> (This does not mean pythonWin doesn't have problems of its own. ) If I
>>>>> just execute the code (double click on the py file, the console shows no
>>>>> problems. IDLE is unhappy.
>>>>> Another side to this is that I use WinMerge to find differences between
>>>>> my last saved copy and the current copy. I found the current copy had
>>>>> two lines where a abc.get() was changed to abc.get. This was undoubtedly
>>>>> from briefly using the pyWin editor, when I mis-hit some keys. Yet pyWin
>>>>> had no trouble executing the program. My guess is that while briefly
>>>>> editing there, I hit some odd combination of keys that produced,
>>>>> perhaps, an invisible character that pyWin ignores.
>>>>> Not the 34672232 window is a dialog that I closed by pressing OK. I
>>>>> would again guess, that, if there is a problem, it occurs in the code
>>>>> that destroys the dialog.
>>>> Well you have to remember that you are trying to run a windowed GUI
>>>> under the control of another windows GUI, so it isn't surprising that
>>>> you hit trouble.
>>>> With IDLE the issue will be that IDLE already created a main window
>>>> before your program started running. With PythonWin you are using two
>>>> different toolkits, so it isn't really surprising that breaks down -
>>>> there will be two entirely separate main loops competing with each other.
>>> Not quite. I take down IDLE when I run pyWin, and vice versa.
>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 22:58:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 19:58:56 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
Message-ID: <x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>


>> The two separate loops being PyWin (which uses MFC) and your program
>> (which uses Tkinter). You just can't mix GUIs in the same process like
>> that, sorry.
>>
>> regards
>>  Stedve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> Deja-vu!
> 
> http://mail.python.org/pipermail/python-list/2001-March/076069.html
The question now is what can I do about it? reboot?

Just to re-iterate the answer I provided the answer to above, I'm using 
Tkinter for the program's GUI.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 23:00:34 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 20:00:34 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<uoHkl.13559$as4.1274@nlpi069.nbdc.sbc.com>
	<5230d343-6a67-4bc9-af10-8d68ffdc8339@s20g2000yqh.googlegroups.com>
	<daJkl.22644$ZP4.13004@nlpi067.nbdc.sbc.com>
Message-ID: <39Nkl.22667$ZP4.17550@nlpi067.nbdc.sbc.com>

> So, how do I get rid of it? reboot?

Just to re-iterate the I provided the question to above, I'm using Tkinter 
for the program's GUI.


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Wed Feb 11 23:04:09 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Wed, 11 Feb 2009 20:04:09 -0800
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>
	<mailman.9340.1234370960.3487.python-list@python.org>
	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>
	<mailman.9344.1234381941.3487.python-list@python.org>
	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>
	<x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
Message-ID: <pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>

It looks like I got an accidentally case of send message 3 times. Well, 
here's a correct below.
> The question now is what can I do about it? reboot?
> 
> Just to re-iterate the answer I provided to *>the question to a post above<*, I'm using 
> Tkinter for the program's GUI.
> 


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jeffgemail at gmail.com  Wed Feb 11 23:16:09 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 20:16:09 -0800 (PST)
Subject: Unicode issue on Windows cmd line
References: <5827412b-5637-4005-9410-972b7f1f18ca@h20g2000yqn.googlegroups.com>
	<49933bb6$0$3304$9b622d9e@news.freenet.de>
	<173b3dc8-4c7d-4049-979f-492ac8d6fb17@i20g2000prf.googlegroups.com>
	<49935F7F.5070508@v.loewis.de>
	<0203136e-4208-45a4-8071-e5249558943e@w35g2000yqm.googlegroups.com>
	<mailman.9377.1234407654.3487.python-list@python.org>
Message-ID: <56bb1488-91c7-434f-ab57-c9c52be80d5b@j35g2000yqh.googlegroups.com>

On Feb 11, 10:00?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 11 Feb 2009 23:11:37 -0200, jeffg <jeffgem... at gmail.com> escribi?:
>
>
>
> > On Feb 11, 6:30?pm, "Martin v. L?wis" <ma... at v.loewis.de> wrote:
> >> > Thanks, I ended up using encode('iso-8859-15', "replace")
> >> > Perhaps more up to date than cp1252...??
> >> If you encode as iso-8859-15, but this is not what your terminal
> >> expects, it certainly won't print correctly. To get correct printing,
> >> the output encoding must be the same as the terminal encoding. If the
> >> terminal encoding is not up to date (as you consider cp1252), then
> >> the output encoding should not be up to date, either.
> > I did try UTF-8 but it produced the upper case character instead of
> > the proper lower case, so the output was incorrect for the unicode
> > supplied.
> > I think both 8859-15 and cp1252 produced the correct output, but I
> > figured 8859-15 would have additional character support (though not
> > sure this is the case - if it is not, please let me know and I'll use
> > 1252). ?I'm dealing with large data sets and this just happend to be
> > one small example. ?I want to have the best ability to write future
> > unicode characters properly based on running from the windows command
> > line (unless there is a better way to do it on windows).
>
> As Martin v. L?wis already said, the encoding used by Python when writing ?
> to the console, must match the encoding the console expects. (And you also ?
> should use a font capable of displaying such characters).
>
> windows-1252 and iso-8859-15 are similar, but not identical. This table ?
> shows the differences (less than 30 printable characters): ?http://en.wikipedia.org/wiki/Western_Latin_character_sets_(computing)
> If your script encodes its output using iso-8859-15, the corresponding ?
> console code page should be 28605.
> "Western European" (whatever that means exactly) Windows versions use the ?
> windows-1252 encoding as the "Ansi code page" (GUI applications), and ?
> cp850 as the "OEM code page" (console applications) -- cp437 in the US ?
> only.
>
> C:\Documents and Settings\Gabriel>chcp 1252
> Tabla de c?digos activa: 1252
>
> C:\Documents and Settings\Gabriel>python
> Python 2.6 (r26:66721, Oct ?2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] ?
> on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
> py> unichr(0x0153).encode("windows-1252")
> '\x9c'
> py> print _
> ?
> py> ^Z
>
> C:\Documents and Settings\Gabriel>chcp 28605
> Tabla de c?digos activa: 28605
>
> C:\Documents and Settings\Gabriel>python
> Python 2.6 (r26:66721, Oct ?2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] ?
> on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
> py> unichr(0x0153).encode("iso-8859-15")
> '\xbd'
> py> print _
> ?
> py> unichr(0x0153).encode("latin9")
> '\xbd'
>
> --
> Gabriel Genellina

Thanks, switched it to windows-1252.


From jeffgemail at gmail.com  Wed Feb 11 23:19:53 2009
From: jeffgemail at gmail.com (jeffg)
Date: Wed, 11 Feb 2009 20:19:53 -0800 (PST)
Subject: Another optimization request :-)
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org> 
	<mailman.9376.1234407426.3487.python-list@python.org>
Message-ID: <cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>

On Feb 11, 9:56?pm, "andrew cooke" <and... at acooke.org> wrote:
> sorry, that was stupid. ?there is no inversion (apart from 1/m), just the
> integration.
>
> still, improving the integration would allow larger steps.
>
> andrew
>
> andrew cooke wrote:
>
> > why are you dong this point by point? ?surely you can express the physics
> > as a set of equations and invert the matrix? ?wouldn't that be a lot
> > faster? ?you'd replace the iteration over all combinations of points with
> > a faster matrix inversion.
>
> > see for example
> >http://www.medwelljournals.com/fulltext/ajit/2006/324-338.pdfpage 331
> > onwards.
>
> > there's a very nice into to the verlet integration mentioned here -
> >http://teknikus.dk/tj/gdc2001.htm
>
> > andrew
>
> > jeffg wrote:
> >> If anyone wants to take this on... I would really really like to have
> >> the spring_layout modified to support multi-threading if at all
> >> possible.
> >> My test data is 20,000, which makes this process 20,000 x 20,000 or
> >> 400,000,000 (400 million) calculations. ?This is taking somewhere
> >> between 2-3 hours an iteration.
> >> I plan to plot out over 1,000,000 data points or more, which would put
> >> this at 1,000,000,000,000 (1 trillion) calculations. ?Any help in
> >> making this more efficient would be much appreciated.
>
> >> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> >> verbose=False):
> >> ? ? """Spring force model layout"""
> >> ? ? if node_pos==None : ?# set the initial positions randomly in 1x1
> >> box
> >> ? ? ? ? vpos=random_layout(G, dim=dim)
> >> ? ? else:
> >> ? ? ? ? vpos=node_pos
> >> ? ? if iterations==0:
> >> ? ? ? ? return vpos
> >> ? ? if G.order()==0:
> >> ? ? ? ? k=1.0
> >> ? ? else:
> >> ? ? ? ? k=N.sqrt(1.0/G.order()) # optimal distance between nodes
> >> ? ? disp={} ? ? ? ? # displacements
>
> >> ? ? # initial "temperature" (about .1 of domain area)
> >> ? ? # this is the largest step allowed in the dynamics
> >> ? ? # linearly step down by dt on each iteration so
> >> ? ? # on last iteration it is size dt.
> >> ? ? t=0.1
> >> ? ? dt=0.1/float(iterations+1)
> >> ? ? for i in range(0,iterations):
> >> ? ? ? ? for v in G:
> >> ? ? ? ? ? ? if verbose==True:
> >> ? ? ? ? ? ? ? ? print("Interation: " + str(i + 1) + ", Calculating: "
> >> + str(v.encode('iso-8859-15', "replace")))
> >> ? ? ? ? ? ? disp[v]=N.zeros(dim)
> >> ? ? ? ? ? ? for u in G:
> >> ? ? ? ? ? ? ? ? delta=vpos[v]-vpos[u]
> >> ? ? ? ? ? ? ? ? dn=max(sqrt(N.dot(delta,delta)),0.01)
> >> ? ? ? ? ? ? ? ? # repulsive force between all
> >> ? ? ? ? ? ? ? ? deltaf=delta*k**2/dn**2
> >> ? ? ? ? ? ? ? ? disp[v]=disp[v]+deltaf
> >> ? ? ? ? ? ? ? ? # attractive force between neighbors
> >> ? ? ? ? ? ? ? ? if G.has_edge(v,u):
> >> ? ? ? ? ? ? ? ? ? ? deltaf=-delta*dn**2/(k*dn)
> >> ? ? ? ? ? ? ? ? ? ? disp[v]=disp[v]+deltaf
>
> >> ? ? ? ? # update positions
> >> ? ? ? ? for v in G:
> >> ? ? ? ? ? ? l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
> >> ? ? ? ? ? ? vpos[v]=vpos[v]+ disp[v]*t/l
> >> ? ? ? ? t-=dt
> >> ? ? return vpos
> >> --
> >>http://mail.python.org/mailman/listinfo/python-list
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>

To be honest, this is not my code and I'm new to python.  It's part of
the open source project NetworkX, but I'm using this one call
extensively.  I'm also not that familiar with the math behind the
physics.  I'll read the documents and see if I can figure it
out.  :-)  Thank you for the links and suggestions.  I really need to
get this code performing at peak levels.


From basilisk96 at gmail.com  Wed Feb 11 23:26:12 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Wed, 11 Feb 2009 20:26:12 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
Message-ID: <cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>

> Don't use a generator then. If you're going to finally return a list (and ?
> sorted does exactly that), build a list right from the start:

Good point. However, for the sake of argument, what if I removed the
sorting requirement and simply wanted the generator? I usually strive
for comprehensions if a for loop can be reduced to such.  Would there
be any speed advantage in this case of a comprehension-style generator
vs. a for-yield loop (assuming there is a way to call func(s) once per
iteration in the comprehension)?  In my example, func() operates on
filename strings, so it's not too bad.. but it's possible for this
pattern to apply to more substantial operations.  My conjecture is
that higher func() loads would favor more the use of a simple for-
yield loop.

Cheers,
Basilisk96


From jonathan.chacon at telefonica.net  Wed Feb 11 23:58:05 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 05:58:05 +0100
Subject: TTS in windows
Message-ID: <119422E84F8C43C8A5E693A09DAEC260@HPVista>

Hello,

I need to use SAPI5 text to speech with python but I don't find anything
that lets me manage speech, tone, volume, etc


Does anybody know anything to do this?

Thanks and regards
	Jonathan Chac?n



From elgrandchignon at gmail.com  Wed Feb 11 23:58:28 2009
From: elgrandchignon at gmail.com (Jason)
Date: Wed, 11 Feb 2009 20:58:28 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
Message-ID: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>

Hey everyone--

I'm pretty new to Python, & I need to do something that's incredibly
simple, but combing my Python Cookbook & googling hasn't helped me out
too much yet, and my brain is very, very tired & flaccid @ the
moment....

I have a list of objects, simply called "list".  I need to break it
into an array (list of lists) wherein each sublist is the length of
the variable "items_per_page".  So array[0] would go from array[0][0]
to array[0][items_per_page], then bump up to array[1][0] - array[1]
[items_per_page], until all the items in the original list were
accounted for.

What would be the simplest way to do this in Python?  And yes, I
realize I should probably be taking Programming 101.....


From jonathan.chacon at telefonica.net  Thu Feb 12 00:00:36 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 06:00:36 +0100
Subject: Capture images in macOS X
Message-ID: <5732EB03A0054D80976798E0EE7FE3A4@HPVista>

Hello,

I need to capture images from the macbook webcam in leopard.
Does anybody know how can I do this?

Thanks and regards
	Jonathan Chac?n



From argo785 at gmail.com  Thu Feb 12 00:06:06 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Wed, 11 Feb 2009 21:06:06 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
Message-ID: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>

Tonight I needed to draw a series of simple shapes in a window using a
bit of math but didn't have much time to do it. I've got very little
GUI toolkit experience. Briefly had a look at the usually-recommended
heavyweight GUI toolkits, but I didn't want to inherit from widget
classes or override paint methods (not that those things don't have
their place). I just wanted to quickly draw some shapes. Within a few
minutes I had what I needed, and it was by using Tkinter. The code
looked something like this:

~~~~
#!/usr/bin/env python

import Tkinter as tk

root = tk.Tk()

canv = tk.Canvas(root, width=647, height=400, background='white')
canv.pack(side=tk.TOP, fill=tk.BOTH, expand=1)

# drawing happens here ...
canv.create_oval(50, 80, 150, 180)
# ...

root.mainloop()
~~~~

Wow that was *really* easy.

After playing around just a bit more, regular GUI programs are pretty
quick and simple to make as well. My only (minor) complaint is that Tk
doesn't draw text antialiased in the various widgets (menus, labels,
buttons, etc.).

Anyway, thanks Tk and Tkinter!


From mensanator at aol.com  Thu Feb 12 00:41:30 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 11 Feb 2009 21:41:30 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>

On Feb 11, 10:58?pm, Jason <elgrandchig... at gmail.com> wrote:
> Hey everyone--
>
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
>
> I have a list of objects, simply called "list". ?I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page". ?So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
>
> What would be the simplest way to do this in Python? ?And yes, I
> realize I should probably be taking Programming 101.....

>>> items_per_page = 20
>>> x = range(113)
>>> layout = divmod(113,20)
>>> if layout[1]>0:
	pages = layout[0]+1
else:
	pages = layout[0]
>>> array = [ x[i*items_per_page:i*items_per_page+items_per_page]  for i in xrange(pages)]
>>> array
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19], [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
70, 71, 72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86,
87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102,
103, 104, 105, 106, 107, 108, 109, 110, 111, 112]]


From tjreedy at udel.edu  Thu Feb 12 00:41:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:41:39 -0500
Subject: how can this iterator be optimized?
In-Reply-To: <cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
Message-ID: <gn0cqf$p9$1@ger.gmane.org>

Basilisk96 wrote:
>> Don't use a generator then. If you're going to finally return a list (and  
>> sorted does exactly that), build a list right from the start:
> 
> Good point. However, for the sake of argument, what if I removed the
> sorting requirement and simply wanted the generator?

Write a generator function with the same loop and a yield.

? I usually strive
> for comprehensions if a for loop can be reduced to such.

You are overdoing it, I think.  Generator expressions are for saving 
programmer time, not machine time.



From skippy.hammond at gmail.com  Thu Feb 12 00:47:21 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 12 Feb 2009 16:47:21 +1100
Subject: TTS in windows
In-Reply-To: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
References: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
Message-ID: <4993B7E9.2030304@gmail.com>

On 12/02/2009 3:58 PM, Jonathan Chac?n wrote:
> Hello,
>
> I need to use SAPI5 text to speech with python but I don't find anything
> that lets me manage speech, tone, volume, etc
>
>
> Does anybody know anything to do this?

It appears this is doable from COM.  With the pywin32 package:

 >>> import win32com.client
 >>> o=win32com.client.Dispatch("{96749377-3391-11D2-9EE3-00C04F797396}")
 >>> o.Speak("Hello there")
1
 >>> o.Volume
100
 >>> o.Volume=50
 >>> o.Speak("Hello there")
1

Works for me on Vista.  The magic number is the value for CLSID_SpVoice, 
which I found by googling (for some reason, the actual definition of 
that CLSID doesn't appear in the SDK headers...)

HTH,

Mark


From sambit2005 at gmail.com  Thu Feb 12 00:48:26 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Thu, 12 Feb 2009 18:48:26 +1300
Subject: Need an application sends from paricular port
Message-ID: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>

Hi

I am new to Python world

 I need a python script , which binds at a user defind port & sends to other
enity , which waits at particular port.
The other enity will respond & Python script should receive that at the
defined port

The communication will happen over UDP

e.g

*Python Appl*

IP: 10.116.78.90
Port : 3000


*Other Enity* :

IP: 10.116.98.87
Port : 3010


Pyhon Appl ------------>UDP  ----> Other Enity
                  <--------------------------


Please help
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From si.422a at yahoo.com  Thu Feb 12 00:52:49 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Wed, 11 Feb 2009 21:52:49 -0800 (PST)
Subject: explain
Message-ID: <25821.66604.qm@web111201.mail.gq1.yahoo.com>

Hello, I want to use python but I do not know that I install Python or ActivePython or VPython or Jython?
My operating system is Windows XP SP2.
Please explain for me completely.



      
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From tjreedy at udel.edu  Thu Feb 12 00:53:25 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:53:25 -0500
Subject: Another optimization request :-)
In-Reply-To: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <gn0dgh$23k$1@ger.gmane.org>

jeffg wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.
> My test data is 20,000, which makes this process 20,000 x 20,000 or
> 400,000,000 (400 million) calculations.  This is taking somewhere
> between 2-3 hours an iteration.
> I plan to plot out over 1,000,000 data points or more, which would put
> this at 1,000,000,000,000 (1 trillion) calculations.  Any help in
> making this more efficient would be much appreciated.
> 
> def spring_layout(G, iterations=50, dim=2, node_pos=None,
> verbose=False):
>     """Spring force model layout"""
>     if node_pos==None :  # set the initial positions randomly in 1x1
> box
>         vpos=random_layout(G, dim=dim)
>     else:
>         vpos=node_pos
>     if iterations==0:
>         return vpos
>     if G.order()==0:
>         k=1.0
>     else:
>         k=N.sqrt(1.0/G.order()) # optimal distance between nodes
>     disp={}         # displacements
> 
>     # initial "temperature" (about .1 of domain area)
>     # this is the largest step allowed in the dynamics
>     # linearly step down by dt on each iteration so
>     # on last iteration it is size dt.
>     t=0.1
>     dt=0.1/float(iterations+1)
>     for i in range(0,iterations):
>         for v in G:
>             if verbose==True:
>                 print("Interation: " + str(i + 1) + ", Calculating: "
> + str(v.encode('iso-8859-15', "replace")))
>             disp[v]=N.zeros(dim)
>             for u in G:
>                 delta=vpos[v]-vpos[u]

Let n = len(vpos).  I believe there are only n-1 different deltas, dns, 
and deltafs, where as n**2 calculations are made.

>                 dn=max(sqrt(N.dot(delta,delta)),0.01)
>                 # repulsive force between all
>                 deltaf=delta*k**2/dn**2
>                 disp[v]=disp[v]+deltaf
>                 # attractive force between neighbors
>                 if G.has_edge(v,u):
>                     deltaf=-delta*dn**2/(k*dn)
>                     disp[v]=disp[v]+deltaf
> 
>         # update positions
>         for v in G:
>             l=max(sqrt(N.dot(disp[v],disp[v])),0.01)
>             vpos[v]=vpos[v]+ disp[v]*t/l
>         t-=dt
>     return vpos

That aside, array calculations like this should be *much* faster with 
numpy.  Or try compiling (with weave or Cython, for instance).



From tjreedy at udel.edu  Thu Feb 12 00:56:07 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 00:56:07 -0500
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0dli$23k$2@ger.gmane.org>

Jason wrote:

> I have a list of objects, simply called "list".

Bad idea.

>  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.

Assuming this is not homework, look at itertools module.


> What would be the simplest way to do this in Python?  And yes, I
> realize I should probably be taking Programming 101.....

I guess it is not.



From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 00:56:27 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 05:56:27 GMT
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <pan.2009.02.12.05.56.28@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 20:58:28 -0800, Jason wrote:

> I have a list of objects, simply called "list".  

Generally speaking, that's not a good choice of names, because it over-
writes ("shadows") the built-in function list().


> I need to break it into
> an array (list of lists) wherein each sublist is the length of the
> variable "items_per_page".  So array[0] would go from array[0][0] to
> array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.


This may not be the simplest or most efficient way of doing it, but it 
doesn't involve any advanced techniques other than slicing (which is 
pretty fundamental to Python).


>>> from string import lowercase  # just some random data
>>> list = list(lowercase)
>>> items_per_page = 5
>>> array = []
>>> num_sublists = len(list)//items_per_page
>>> if len(list) % items_per_page != 0:
...     num_sublists += 1
...
>>> for i in range(num_sublists):
...     array.append(list[i*items_per_page:(i+1)*items_per_page])
...
>>>
>>> from pprint import pprint
>>> pprint(array)
[['a', 'b', 'c', 'd', 'e'],
 ['f', 'g', 'h', 'i', 'j'],
 ['k', 'l', 'm', 'n', 'o'],
 ['p', 'q', 'r', 's', 't'],
 ['u', 'v', 'w', 'x', 'y'],
 ['z']]
>>> 


There are other alternatives. Here's a more advanced technique:

>>> ipp = 7  # use a shorter name
>>> m, n = divmod(len(list), ipp)
>>> array = [list[i*ipp:(i+1)*ipp] for i in range(m+bool(n))]
>>> pprint(array)
[['a', 'b', 'c', 'd', 'e', 'f', 'g'],
 ['h', 'i', 'j', 'k', 'l', 'm', 'n'],
 ['o', 'p', 'q', 'r', 's', 't', 'u'],
 ['v', 'w', 'x', 'y', 'z']]




-- 
Steven


From pythonnutter at gmail.com  Thu Feb 12 00:59:46 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 12 Feb 2009 16:59:46 +1100
Subject: Programmatically changing network proxy settings on the Mac
In-Reply-To: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>
References: <f273fa03-3126-4443-ae2d-1e0c83b13952@x38g2000yqj.googlegroups.com>
Message-ID: <af90b3410902112159r4fb02c91r223d21d01e0692a3@mail.gmail.com>

OS X is POSIX/UNIX system so your basic plan of going about things:
1. Learn what proxy/network subsystem Tiger uses
2. Learn what proxy/network subsystem Leopard uses (same as 1., or has
it changed?)
3. Based on 1 and 2 learn the config file names and locations.
4. Based on 3 you will determine if the file is text or xml format so
learn file processing for whichever one
5. Read the config file, Make some changes in OS X, read the config
file and compare changes.
6. Programatically script changes to those config file(s).
7. Learn if any service/daemon needs to be restarted or if an
interface needs to be brought down/up to bring in those changes to the
config file.
8. Script in what you learned in 7.
9. Finished.

2009/2/11  <arunasunil at gmail.com>:
> Hi,
>
> Anybody have suggestions of how network proxy settings can be changed
> programmatically on the Mac, Tiger and Leopard. Are there any helpful
> python api's that can be used.
>
> Thanks
> Sunil
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From david.birdsong at gmail.com  Thu Feb 12 01:09:11 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 22:09:11 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <mailman.9375.1234406953.3487.python-list@python.org> 
	<e688aeec-0db3-4786-b25f-f44f76346e5e@v5g2000pre.googlegroups.com> 
	<mailman.9379.1234410481.3487.python-list@python.org>
Message-ID: <3e3d6829-cda8-4e34-98ab-617b65caf436@l39g2000yqn.googlegroups.com>

On Feb 11, 7:47?pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Thu, 12 Feb 2009 03:01:16 -0000, birdsong <david.birds... at gmail.com> ?
> wrote:
>
> > So I guess I didn't have a complete understanding of poll, I thought
> > it returned file descriptors that had registered an event that the
> > user asked to watch for. ?In my case, select.POLLIN
> > Constant ? Meaning
> > POLLIN ? ? There is data to read
>
> > ...there ins't any data to be read. ?The file is readable, yes, but is
> > that all that the syscall has to offer?
>
> To quote the web page referenced in help(select):
>
> "It cannot be used on regular files to determine whether a file has grown ?
> since it was last read."
>
> poll() and friends are wrappers over the socket library "poll" and
> "select" functions, which primarily exist to facilitate asynchronous
> socket communications. ?They can take ordinary file descriptors as
> well as sockets because there's no good reason not to, but a regular
> file will always be ready to read as long as you haven't read past
> the end of file.
>
> You're trying to use a regular file as if it was a pipe. ?My first
> obvious question is do you have to do it this way? ?Do you have
> any control over the program writing to file? ?Can you cause the
> output to go to stdout and pipe it into your script's stdin
> instead? ?That would make your life vastly easier.
agreed, this was my original idea, but i figured implementing a tail -
f via poll was alot faster to write and implement.  i'm glad at least
know why it wasn't working as expected.

i've already written a tail -f similar to the one found in the link
from a later poster, but i was hoping to use poll to cut down on
unecessary seeks -i'm trying to avoid actions that would drive up
iowait on the boxes this would run on.

thanks for the clarification on the poll family of syscalls.

>
> If you can't, I'm not sure what your best strategy is. ?I'd
> be tempted to use "tail -f filetocheck | yourscript.py" and
> palm the job off on an already-written tool. ?If you want to
> do it in Python, the only thing that springs to mind is
> periodically checking the size of the file and reading more
> when that changes. ?You'll need to be very careful to keep
> what size you think the file is in sync with how much you've
> read!
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses



From ntwrkd at gmail.com  Thu Feb 12 01:09:46 2009
From: ntwrkd at gmail.com (gofkuckyourself)
Date: Wed, 11 Feb 2009 22:09:46 -0800
Subject: explain
In-Reply-To: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
References: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
Message-ID: <f257b9ab0902112209s6d6c29f9i43a482422aa64c8c@mail.gmail.com>

Saeed,
The standard Python distribution is community supported and available
on Windows http://www.python.org/download/windows/
ActivePython is ActiveState's version of Python with extra libraries
and commercial support available
VPython I am not familiar with, perhaps someone else can speak to this
Jython is good if you are used to developing in Java and want to
utlize / embed Python in Java code. It is also good for many other
reasons, but for beginning purposes I would recommend the standard
python distribution.


To get started see http://www.python.org/about/gettingstarted/

Hope this helps.

On Wed, Feb 11, 2009 at 9:52 PM, Saeed Iravani <si.422a at yahoo.com> wrote:
> Hello, I want to use python but I do not know that I install Python or
> ActivePython or VPython or Jython?
> My operating system is Windows XP SP2.
> Please explain for me completely.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From pythonnutter at gmail.com  Thu Feb 12 01:12:41 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 12 Feb 2009 17:12:41 +1100
Subject: explain
In-Reply-To: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
References: <25821.66604.qm@web111201.mail.gq1.yahoo.com>
Message-ID: <af90b3410902112212v41974a6cs9277129df70e03dc@mail.gmail.com>

If your use is to Generically "want to use python on Windows XP" you
install the standard/generic Python that you download from python.org

Without any details to decide with, I would also say download version
2.5.4 of Python from python.org

2009/2/12 Saeed Iravani <si.422a at yahoo.com>:
> Hello, I want to use python but I do not know that I install Python or
> ActivePython or VPython or Jython?
> My operating system is Windows XP SP2.
> Please explain for me completely.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 01:13:38 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 06:13:38 GMT
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>
	<7xeiy52zfl.fsf@ruckus.brouhaha.com>
	<mailman.9320.1234344687.3487.python-list@python.org>
Message-ID: <pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:

>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>> def fact(n):
>>>     if n < 0: raise ValueError
>>>     if n = 0: return 1
>>>     return fact(n-1)*n
>>>
>>> At the risk of premature optimization, I wonder if there is an idiom
>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>> recursive calls?
> 
> Reverse the test order
> 
> def fact(n):
>      if n > 0: return fact(n-1)*n
>      if n == 0: return 1
>      raise ValueError
> 
> You must test recursive versus terminal case every call in any case.
> Nearly always, the first test passes and second is not done. You only
> test n==0 once, either to terminate or raise exception. This works for
> any integral value and catches non-integral values. (There is some delay
> for that, but only bad calls are penalized.)

Nice try, but in fact no.



>>> fact(None)  # works okay
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in fact
ValueError
>>>
>>> fact({})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in fact
TypeError: unsupported operand type(s) for -: 'dict' and 'int'

You're relying on arbitrary ordering of types in Python 2.x, and of 
course in Python 3 that fails altogether.

Thanks for everyone who responded, I now have some food for thought.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Thu Feb 12 01:15:19 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 12 Feb 2009 06:15:19 GMT
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
Message-ID: <pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>

On Wed, 11 Feb 2009 20:26:12 -0800, Basilisk96 wrote:

>> Don't use a generator then. If you're going to finally return a list
>> (and sorted does exactly that), build a list right from the start:
> 
> Good point. However, for the sake of argument, what if I removed the
> sorting requirement and simply wanted the generator? 

The same applies. You're problem is that you call an expensive function 
three times instead of once. Some compilers can optimize that away, but 
not in Python, because there's no guarantee that the function will be the 
same function between calls.


> I usually strive
> for comprehensions if a for loop can be reduced to such.

Any particular reason?


> Would there be
> any speed advantage in this case of a comprehension-style generator vs.
> a for-yield loop (assuming there is a way to call func(s) once per
> iteration in the comprehension)?  

I understand that comprehensions are slightly slower. I recently found a 
40% speed up on a trivial generator expression when converted to a for 
loop. Admittedly the gen expr did very little, and I haven't tested list 
comprehensions.



> In my example, func() operates on
> filename strings, so it's not too bad.. but it's possible for this
> pattern to apply to more substantial operations.  My conjecture is that
> higher func() loads would favor more the use of a simple for- yield
> loop.

If there's only one call to func(), and you ignore the (probably) fixed 
cost of jumping into a generator each time, then it shouldn't make any 
difference.

If you are comparing one call to func() in a for loop versus three calls 
to func() in a list comp or generator expression, then of course the for 
loop will be more efficient.


-- 
Steven


From mail at microcorp.co.za  Thu Feb 12 01:18:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 12 Feb 2009 08:18:54 +0200
Subject: Functional schmunctional...
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
	<gmuo5k$tdt$1@ger.gmane.org>
Message-ID: <00a501c98cd9$c8693620$0d00a8c0@hendrik>

"Steve Holden" <ste....nweb.com> wrote:

> Jeez, doesn't anyone read the fine manual any more? I hope this was just
> an academic exercise.
> 
> >>> socket.inet_ntoa(struct.pack("!l", 1000000000))
> '59.154.202.0'
> >>>
> 
> Holden's rule: when it looks simple enough to be worth including in the
> standard library it may well already *be* in the standard library.

Aaah! But how do you find it, if you don't already know
where it lives and what it's called ?

- Hendrik




From mail at microcorp.co.za  Thu Feb 12 01:36:03 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 12 Feb 2009 08:36:03 +0200
Subject: select.poll.poll() never blocks
References: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
Message-ID: <018901c98cdc$2de44c40$0d00a8c0@hendrik>

"birdsong" <dav..g at gmail.com>wrote:

8<----------- select not blocking on empty file stuff -----------------

> Any help on what I'm missing would be appreciated.

Why do you expect it to block? 
It is ready to read, to return end of file.

- Hendrik




From rt8396 at gmail.com  Thu Feb 12 01:39:24 2009
From: rt8396 at gmail.com (r)
Date: Wed, 11 Feb 2009 22:39:24 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
Message-ID: <766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>

Hello,

Tkinter is a great GUI toolkit, for what it lacks in prettiness it
more than makes up for in simple and quick GUI building. I think this
is the main reason Tkinter continues to be Python's built-in GUI
toolkit. It is a great place to start for those with no GUI
experience. Sure it will never be as rich as wxPython or the like, but
that is not what Tkinter is made for.

I use Tkinter for all my tools that need a UI, and others as well. The
only complaint i have is the poor support for image types i really
wish there where at least support for one good image like jpg, png,
and full color bitmaps.The canvas widget could also use a little more
functionality, but hey maybe one day i will have time to polish it up
a bit.


From metolone+gmane at gmail.com  Thu Feb 12 01:48:57 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Wed, 11 Feb 2009 22:48:57 -0800
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0gof$8lv$1@ger.gmane.org>


"Jason" <elgrandchignon at gmail.com> wrote in message 
news:8158439d-faae-4889-a1cf-8d9fee112e9b at v39g2000yqm.googlegroups.com...
> Hey everyone--
>
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
>
> I have a list of objects, simply called "list".  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
>
> What would be the simplest way to do this in Python?  And yes, I
> realize I should probably be taking Programming 101.....

>>> def splitlist(L,count):
...     M=[]
...     for i in xrange(0,len(L),count):
...         M.append(L[i:i+count])
...     return M
...
>>> L=range(18)
>>> splitlist(L,3)
[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11], [12, 13, 14], [15, 16, 17]]
>>> splitlist(L,4)
[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17]]

-Mark




From timr at probo.com  Thu Feb 12 01:58:32 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 12 Feb 2009 06:58:32 GMT
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
	<7xwsby7mw3.fsf@ruckus.brouhaha.com>
Message-ID: <rmh7p498u3kvik6psr3nt2dlltoorngapp@4ax.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:

>In case anyone is interested: Gideon Smeding of the University of
>Utrecht has written a masters' thesis titled "An executable
>operational semantics for Python".

That's an interesting grammatical construct.  I would have said either
"Executable operational semantics for Python," or "An executable
operational semantic for Python."

"A semantics" just doesn't flow.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From david.birdsong at gmail.com  Thu Feb 12 02:14:25 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 11 Feb 2009 23:14:25 -0800 (PST)
Subject: select.poll.poll() never blocks
References: <e4e8722c-6553-4e59-a26a-8353822dfc45@k36g2000pri.googlegroups.com>
	<mailman.9392.1234421149.3487.python-list@python.org>
Message-ID: <30014b58-d47a-4930-96a8-9fcd02764d7a@r41g2000yqm.googlegroups.com>

On Feb 11, 10:36?pm, "Hendrik van Rooyen" <m... at microcorp.co.za>
wrote:
> "birdsong" <dav... at gmail.com>wrote:
>
> 8<----------- select not blocking on empty file stuff -----------------
>
> > Any help on what I'm missing would be appreciated.
>
> Why do you expect it to block?
> It is ready to read, to return end of file.
>
I expected it to block because of the name and meaning of the flag,
POLLIN, which I thought meant new data has arrived to be read.  Since
I only registered a single file descriptor, I would have expected poll
to not return until there was new data to be read.  I understand now
that it is not the case.


From jonathan.chacon at telefonica.net  Thu Feb 12 02:38:44 2009
From: jonathan.chacon at telefonica.net (=?iso-8859-1?Q?Jonathan_Chac=F3n?=)
Date: Thu, 12 Feb 2009 08:38:44 +0100
Subject: TTS in windows
In-Reply-To: <4993B7E9.2030304@gmail.com>
References: <119422E84F8C43C8A5E693A09DAEC260@HPVista>
	<4993B7E9.2030304@gmail.com>
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAIAcWNRwqt5NlGfOhdO75b3CgAAAEAAAAEFRWV2vlltHk2d71jCrSqABAAAAAA==@telefonica.net>

 

-----Mensaje original-----
De: Mark Hammond [mailto:skippy.hammond at gmail.com] 
Enviado el: jueves, 12 de febrero de 2009 6:47

>It appears this is doable from COM.  With the pywin32 package:

Well, I have problems to install pywin32 (pywin32-212.win32-py2.5.exe)

I'll try to solve that problem later


Thanks
	Jonathan Chac?n



From xahlee at gmail.com  Thu Feb 12 02:45:47 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 11 Feb 2009 23:45:47 -0800 (PST)
Subject: which language has syntax that visually represent a tree? [was X#]
References: <6toeb5Fbjeu1U1@mid.individual.net>
Message-ID: <258b8081-9265-4c47-b23a-132e0ff696c0@r37g2000prr.googlegroups.com>

syntax that represent a tree purely [was X#]

On Jan 21, 3:13 am, Pascal Costanza <p... at p-cos.net> wrote:
> LOL: http://www.xsharp.org/samples/

Today, i was nosing about some blogs, which made me come to:
http://blog.fogus.me/2009/02/06/yegge-clojure-arc-and-lolita-or-days-of-future-past

in which he wrote: ?Now I?m not a LISP expert, but it seems to me that
the S-Expression is generally regarded as the canonical representation
of the LISP AST (and many other languages for that matter). That is,
the LISP syntax is as close to an AST as one can get. Perhaps the
presence of macros, #, `, ?, and , muddy the waters a bit, but not
much.?

that is technically not true. Although you mentioned lisp syntax
irregularities like ?# , ,@ '?, but in general this sentiment that
lisp has regular syntax, or that its syntax is closest to abstract
syntax tree, is perpetuating a myth.

Mathematica language's syntax, XML, and XML derived general purpose
languages (e.g. O:XML, X#), are in fact more regular and closest to a
pure tree representation of the abstract syntax tree.

For detail, see:

? Fundamental Problems of Lisp
  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
  (the first section; on syntax irregularity)

? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
Nested Notations
  http://xahlee.org/UnixResource_dir/writ/notations.html

also note, nesting matching delimiters is not the only way to
represent a tree. Indentation, such as used in Python or ascii-picture
tree used to represent directories and sub dirs and files, is another
form, arguably has more clarity than nesting with delimiters. As far
as i known, there were a couple such proposal/spec/library with
working implementation of this syntax that works for Scheme lisp.

in general, the question is what are ways to represent a tree
structure visually using text. The lisp, Mathematica approach is
nesting matching pairs. Ascii-picture approch is using lines to
represent a tree node and indentation to represent their level.
(python's syntax borrows this idea, however not in a pure form, in the
sense that the source code's visual representation does not correspond
to python's AST, far from it)

Note here, one of the important aspect here is VISUALLY. Because
otherwise any syntax is abstract syntax tree by definition. This
criterion can be formalized mathematically, by saying that the parser
for such a syntax should be very simple as having just one heuristics
that is based on recursion. (i dont have expertise in parsing, but in
parser jargon, i think there are simple terms to describe this class
of syntax, something like: its lexical grammar can be parsed by
parsing expression grammar)

Another important aspect here is that the source code of lang with
such syntax also needs to remain human readable and practically usable
for programers to type conveniently. This is the reason, lisp has few
irregular syntax introduced. Mathematica, take the approach of a layer
of syntax on top of the regular. This in my opinion has 2 major
advantages: A: the regularity of the syntax is unadulterated. B:
arbitrary shorter, traditional, or algebraic syntax can be introduced.
This is also why, python's syntax isn't a pure representation of its
abstract syntax tree, else, to code ?print 3+4*5? becomes:

 print
  +
   3
   *
    4
    5

As for XML derived languages, the problem of verbosity and nesting
largely remains. The practiced solution seems to head towards a
specialized editor so that programers work on the editor's simpler
representation instead of the source code. (e.g. much of MathML, and
conversely Microsoft Word with its XML file format)

  Xah
? http://xahlee.org/

?


From grflanagan at gmail.com  Thu Feb 12 02:46:47 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Thu, 12 Feb 2009 07:46:47 +0000
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
Message-ID: <gn0k57$g51$1@ger.gmane.org>

Jason wrote:
> Hey everyone--
> 
> I'm pretty new to Python, & I need to do something that's incredibly
> simple, but combing my Python Cookbook & googling hasn't helped me out
> too much yet, and my brain is very, very tired & flaccid @ the
> moment....
> 
> I have a list of objects, simply called "list".  I need to break it
> into an array (list of lists) wherein each sublist is the length of
> the variable "items_per_page".  So array[0] would go from array[0][0]
> to array[0][items_per_page], then bump up to array[1][0] - array[1]
> [items_per_page], until all the items in the original list were
> accounted for.
> 

If you need to pad the last item:

def chunk( seq, size, pad=None ):
     '''
     Slice a list into consecutive disjoint 'chunks' of
     length equal to size. The last chunk is padded if necessary.

     >>> list(chunk(range(1,10),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
     >>> list(chunk(range(1,9),3))
     [[1, 2, 3], [4, 5, 6], [7, 8, None]]
     >>> list(chunk(range(1,8),3))
     [[1, 2, 3], [4, 5, 6], [7, None, None]]
     >>> list(chunk(range(1,10),1))
     [[1], [2], [3], [4], [5], [6], [7], [8], [9]]
     >>> list(chunk(range(1,10),9))
     [[1, 2, 3, 4, 5, 6, 7, 8, 9]]
     >>> for X in chunk([],3): print X
     >>>
     '''
     n = len(seq)
     mod = n % size
     for i in xrange(0, n-mod, size):
         yield seq[i:i+size]
     if mod:
         padding = [pad] * (size-mod)
         yield seq[-mod:] + padding

If you search the list archive, there is surely an example which will do 
the same for an arbitrary iterable (in general, you can't assume that 
`len(seq)` will work for an iterable that is not a list, set or tuple). 
But if you are just starting with Python, don't worry about this.




From greg at cosc.canterbury.ac.nz  Thu Feb 12 03:30:49 2009
From: greg at cosc.canterbury.ac.nz (greg)
Date: Thu, 12 Feb 2009 21:30:49 +1300
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <4993DE39.8030200@cosc.canterbury.ac.nz>

rantingrick wrote:

> It has long been my dream to create an open source 3D CAD program and
> 
> I have a real good idea of the UI design

Have you seen Sketchup?

    http://sketchup.google.com/

It has an amazingly intuitive user interface, much better
than any other 3D modeller I've seen. Anyone thinking of
designing a 3D app would do well to study it closely, IMO.

Something with a Sketchup-like UI but designed for serious
CAD work would be an incredibly good thing to have.

In any case, your project sounds interesting, and I'll
be happy to discuss ideas if you want.

-- 
Greg


From sjmachin at lexicon.net  Thu Feb 12 03:53:06 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 12 Feb 2009 00:53:06 -0800 (PST)
Subject: Breaking Python list into set-length list of lists
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
	<mailman.9395.1234424821.3487.python-list@python.org>
Message-ID: <f9e73436-0089-4e99-a215-a077bea730c7@v18g2000pro.googlegroups.com>

On Feb 12, 6:46?pm, Gerard Flanagan <grflana... at gmail.com> wrote:
> Jason wrote:
> > Hey everyone--
>
> > I'm pretty new to Python, & I need to do something that's incredibly
> > simple, but combing my Python Cookbook & googling hasn't helped me out
> > too much yet, and my brain is very, very tired & flaccid @ the
> > moment....
>
> > I have a list of objects, simply called "list". ?I need to break it
> > into an array (list of lists) wherein each sublist is the length of
> > the variable "items_per_page". ?So array[0] would go from array[0][0]
> > to array[0][items_per_page], then bump up to array[1][0] - array[1]
> > [items_per_page], until all the items in the original list were
> > accounted for.
>
> If you need to pad the last item:
>
> def chunk( seq, size, pad=None ):
> ? ? ?'''
> ? ? ?Slice a list into consecutive disjoint 'chunks' of
> ? ? ?length equal to size. The last chunk is padded if necessary.
>
> ? ? ?>>> list(chunk(range(1,10),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
> ? ? ?>>> list(chunk(range(1,9),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, 8, None]]
> ? ? ?>>> list(chunk(range(1,8),3))
> ? ? ?[[1, 2, 3], [4, 5, 6], [7, None, None]]
> ? ? ?>>> list(chunk(range(1,10),1))
> ? ? ?[[1], [2], [3], [4], [5], [6], [7], [8], [9]]
> ? ? ?>>> list(chunk(range(1,10),9))
> ? ? ?[[1, 2, 3, 4, 5, 6, 7, 8, 9]]
> ? ? ?>>> for X in chunk([],3): print X
> ? ? ?>>>
> ? ? ?'''
> ? ? ?n = len(seq)
> ? ? ?mod = n % size
> ? ? ?for i in xrange(0, n-mod, size):
> ? ? ? ? ?yield seq[i:i+size]
> ? ? ?if mod:
> ? ? ? ? ?padding = [pad] * (size-mod)
> ? ? ? ? ?yield seq[-mod:] + padding
>
> If you search the list archive, there is surely an example which will do
> the same for an arbitrary iterable (in general, you can't assume that
> `len(seq)` will work for an iterable that is not a list, set or tuple).
> But if you are just starting with Python, don't worry about this.

Aren't you making it out to be more mysterious than it needs to be?

Let's show the guy just a teensy bit of Python 102:

| >>> import string; data = string.ascii_lowercase
| >>> page_size = 6
| >>> pages = []
| >>> index = 0
| >>> for item in data:
| ...    if not index:
| ...       pages.append([])
| ...       shelve_it = pages[-1].append
| ...    index = (index + 1) % page_size
| ...    shelve_it(item)
| ...
| >>> pages
| [['a', 'b', 'c', 'd', 'e', 'f'], ['g', 'h', 'i', 'j', 'k', 'l'],
['m', 'n', 'o', 'p', 'q', 'r'], ['s', 't', 'u', 'v', 'w', 'x'], ['y',
'z']]
| >>>


From no.i.dont at want.mail.from.spammers.com  Thu Feb 12 04:07:53 2009
From: no.i.dont at want.mail.from.spammers.com (WP)
Date: Thu, 12 Feb 2009 10:07:53 +0100
Subject: Why does way_1() obtain the correct list but way_2() gets an empty
	list?
Message-ID: <6vi779Fk0ogtU1@mid.individual.net>

Hello group! This is probably a silly newbie mistake but consider the 
following program:

import libsbml

def getSBMLModel(biomodel_path):
     reader = libsbml.SBMLReader()

     sbml_doc = reader.readSBML(biomodel_path)
     sbml_model = None

     if sbml_doc.getNumErrors() > 0:
         print 'I couldn\'t read the file %s!' % biomodel_path
         return None
     else:
         sbml_model = sbml_doc.getModel()

     return sbml_doc.getModel() # None if file couldn't be opened


def way_1(biomodel_path):
     reader = libsbml.SBMLReader()
     sbml_doc = reader.readSBML(biomodel_path)
     sbml_model = sbml_doc.getModel()

     if sbml_model == None:
         return

     l = sbml_model.getListOfSpecies()
     print 'In way_1(): Got list %s with the length %i' % (l, len(l))


def way_2(biomodel_path):
     sbml_model = getSBMLModel(biomodel_path)

     if sbml_model == None:
         return

     l = sbml_model.getListOfSpecies()
     print 'In way_2(): Got list %s with the length %i' % (l, len(l))


file = '../BIOMD0000000003.xml'
# Changing the order of these two calls doesn't help, only way_1() works.
way_1(file)
way_2(file)

When run, the output is:
In way_1(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
type 'ListOfSpecies *' at 0x291c8bc> > with the length 3
In way_2(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
type 'ListOfSpecies *' at 0x27fb57c> > with the length 0

I don't get it way the species list obtained in way_2() is empty? For 
the input file I'm using I should be getting 3 species for the test file 
I'm using.
I'm sorry that this program uses a third-party library which is probably 
unknown to many, but since I make a lot of newbie mistakes I thought 
that it's very likely that this is a issue in how I use python, not a 
library issue. To compensate somewhat I tried to show my entire test 
program and its output and make that test program as clear as possible.

So if anyone knows why I get this behavior I would like to hear it and I 
will have learned something today too! :)

- WP


From deets at nospam.web.de  Thu Feb 12 04:22:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 10:22:33 +0100
Subject: Embed a web browser into a page
References: <gmvrd4$1njp$1@news.ett.com.ua>
Message-ID: <6vi82pFjn2ocU1@mid.uni-berlin.de>

Carbon Man wrote:

> Hi,
> I need to embed a web browser into a python page. I am coming from the MS
> world where I created an app that all of it's interfaces were actually web
> pages rendered in an Internet Explorer activex control. There was a object
> hook that allowed you to call into the host environment from javascript.
> Basically the host environment would receive the documentComplete event
> and call a method in the document's Javascript passing in an object
> reference. That reference would then be available for calls to be made
> from Javascript back into the host environment.
> I am just starting to explore the Pythonic programming jungle and I was
> wondering if there is a way to do something similar that would work
> cross-platform?
> I guess there is much more complexity in it when you start to go across
> o/s platform boundaries. The common web interface would then be Gecko or
> WebKit? So can someone suggest what would be required to build a
> cross-platform Python app that was capable of browsing HTML files,
> receiving events from the browser, and that allows the embedded page to
> call host Python modules from Javascript via an object reference? Or I am
> asking too much :)

The only thing that might work is Qt + webkit that is used as it's browser.
Everything else is not cross platform.

Diez


From Krzysztof.Retel at googlemail.com  Thu Feb 12 04:23:54 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Thu, 12 Feb 2009 01:23:54 -0800 (PST)
Subject: ANN: Python 2.6 Quick Reference available
References: <4991d7b0$0$4785$426a34cc@news.free.fr>
	<ae893bba-dbf1-453a-aaf8-f4fd76978065@m42g2000yqb.googlegroups.com>
	<mailman.9371.1234400061.3487.python-list@python.org>
Message-ID: <8200f03c-886b-4520-87d4-6fc66515ad84@m40g2000yqh.googlegroups.com>

On Feb 12, 12:54?am, pyt... at bdurham.com wrote:
> Richard,
>
> An excellent tool. Great job!!!
>
> Thank you for sharing this with the Python community.
>
> Regards,
> Malcolm

Many thanks Richard and Josh.
I've just started my adventure with Python, and this document will
help me a lot.

Cheers,
K


From see.signature at no.spam  Thu Feb 12 04:29:44 2009
From: see.signature at no.spam (Eric Brunel)
Date: Thu, 12 Feb 2009 10:29:44 +0100
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
Message-ID: <op.uo8fbuazwepdt4@ericb.pragmadev>

On Thu, 12 Feb 2009 06:06:06 +0100, <argo785 at gmail.com> wrote:
[snip]
> My only (minor) complaint is that Tk
> doesn't draw text antialiased in the various widgets (menus, labels,
> buttons, etc.).

 From version 8.5 of tcl/tk, it's supposed to do it. See this page:
http://www.tcl.tk/software/tcltk/8.5.tml
under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only  
about X11 and Mac OS X; don't know if it works on Windows...
-- 
python -c "print ''.join([chr(154 - ord(c)) for c in  
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])"


From robin at reportlab.com  Thu Feb 12 05:08:11 2009
From: robin at reportlab.com (Robin Becker)
Date: Thu, 12 Feb 2009 10:08:11 +0000
Subject: best way to serve wsgi with multiple processes
In-Reply-To: <470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
References: <2d705579-6c7e-46b1-a9f7-4be4c3af487a@t13g2000yqc.googlegroups.com>
	<470f306f-a887-4ee5-952c-d01a66eec411@w39g2000prb.googlegroups.com>
Message-ID: <4993F50B.6060507@chamonix.reportlab.co.uk>

Graham Dumpleton wrote:
.........
> requests.
> 
> If the work is indeed long running, the backend process would normally
> just acknowledge the request and not wait. The web page would return
> and it would be up to user to then somehow occassionally poll web
> server, manually or by AJAX, to see how progres is going. That is,
> further XML-RPC requests from main server to backend daemon process
> asking about progress.
.......
this is exactly what we do with the long runners. The wsgi (django in our case) 
process can work out how long the process is likely to take and either responds 
directly or offloads the job to an xmrpc server and responds with a page 
containing a token allowing access to the queue server which refreshes 
periodically to determine job status etc etc. When the job finishes the refresh 
request returns the job result and finishes looping. In our case we don't need 
to worry about people abandoning the job since the results are cached and may be 
of use to others (typical case produce brochure containing details of all 
resources in a country or large city). To avoid overload the xmlrpc server is 
only allowed to run 3 active threads from its queue.
-- 
Robin Becker



From anders.mackey at gmail.com  Thu Feb 12 05:40:15 2009
From: anders.mackey at gmail.com (Fisherking)
Date: Thu, 12 Feb 2009 02:40:15 -0800 (PST)
Subject: Match items in large list
Message-ID: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>

Hi,

I hope you can help me with this optimizing problem!
I have a large list of dictionaries (about 250 000 of them). Two or
more of these dictionaries contains the same data (not more than five
or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
(the dictionaries are really containg phone numbers, duration time and
call time.)

Which are the best way of searching through the list and extract the
items that are the same. In the first run I want to find every item
that are the same as {'a':1,'b':'2','c':3}, the second {'d':
4,'e':'5','f':6} etc. The list are not read-only and I can pop them
out of the list when I have found them!

(How can I found items that are almost the same? e.g. {'a':
1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )

In the second part of this program I need to take each of these items
(similar items are treated as one) and find these in a database that
contains 2.5M posts!

The python version I am bound to is Python 2.3

thanks for your help!


From andrew at acooke.org  Thu Feb 12 05:53:47 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 07:53:47 -0300 (CLST)
Subject: Another optimization request :-)
In-Reply-To: <cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
	<3f05ec0f12c2042f52618fb0db5bbac4.squirrel@acooke.dyndns.org>
	<mailman.9376.1234407426.3487.python-list@python.org>
	<cef2831c-92c7-411c-a637-e473c60cfedb@b16g2000yqb.googlegroups.com>
Message-ID: <2a92b74f3f992874208a231626423169.squirrel@localhost>

jeffg wrote:
> To be honest, this is not my code and I'm new to python.  It's part of
> the open source project NetworkX, but I'm using this one call
> extensively.  I'm also not that familiar with the math behind the
> physics.  I'll read the documents and see if I can figure it
> out.  :-)  Thank you for the links and suggestions.  I really need to
> get this code performing at peak levels.

the maths is quite simple really, if you know any physics.  it imagines
that a spring connects each point, and then works out what the total
effect of all the springs is.  that gives the net "push" on each point. 
it then goes through and moves each point a small amount in the direction
of the push (there's a "max" that makes no sense physically but probably
gives better numeric stability).

once they have moved, their positions have changed, so everything needs to
be calculated again, hence the iteration.

terry's suggestion was that, rather than working particle by particle, if
you can generalise the code to use matrices then you can use numpy.  that
would mean more of the calculation is done using C rather than Python, and
so would be a big speed-up.

that means that you need to rewrite the program so that you don't have the
for-loops in Python (for u.. and for v...).  instead you need to call
numpy to do array calculations.

that is going to give you much more speedup than what i recommended
(modifying the integration step at the end).

to be honest, although this is not hard if you are used to this kind of
thing, if the above isn't obvious it is quite a job.  you would probably
be better looking for a different library.  unfortunately i don't know of
one (i looked for exactly this a month or two ago and concluded i would
have to write my own; i didn't have time so i used a simpler layout).  i'm
really busy, or i would do this for you, because it's interesting and
useful.  but the code you have looks "amateur" - it wasn't written by
someone who does numerical work for a living.  that doesn't mean it's not
correct or that the original author was stupid, but it does mean that to
make it efficient means looking at the problem in a different way.

there are certainly (very good) java libraries that do this.  could you
use jpython and call out to one of those?  if so, that's probably your
best approach.

andrew




From http  Thu Feb 12 06:06:48 2009
From: http (Paul Rubin)
Date: 12 Feb 2009 03:06:48 -0800
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <7xy6wb3odz.fsf@ruckus.brouhaha.com>

Fisherking <anders.mackey at gmail.com> writes:
> Which are the best way of searching through the list and extract the
> items that are the same.

Sort the list, then scan through looking for duplicates, which will be
adjacent to each other.


From martin at marcher.name  Thu Feb 12 06:32:33 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 12:32:33 +0100
Subject: Match items in large list
In-Reply-To: <7xy6wb3odz.fsf@ruckus.brouhaha.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
	<7xy6wb3odz.fsf@ruckus.brouhaha.com>
Message-ID: <5fa6c12e0902120332h2381ff42t7585f8c3b83ad58e@mail.gmail.com>

Hi,

2009/2/12 Paul Rubin <http>:
> Fisherking <anders.mackey at gmail.com> writes:
>> Which are the best way of searching through the list and extract the
>> items that are the same.

hmmm how about using sqlites in memory database and let SQL take care
of finding that for you?

hth
Martin


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 12 06:54:55 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 12 Feb 2009 12:54:55 +0100
Subject: Why does way_1() obtain the correct list but way_2() gets an
	empty list?
In-Reply-To: <6vi779Fk0ogtU1@mid.individual.net>
References: <6vi779Fk0ogtU1@mid.individual.net>
Message-ID: <49940e09$0$5147$426a34cc@news.free.fr>

WP a ?crit :
> Hello group! This is probably a silly newbie mistake but consider the 
> following program:
> 
> import libsbml
> 
> def getSBMLModel(biomodel_path):
>     reader = libsbml.SBMLReader()
> 
>     sbml_doc = reader.readSBML(biomodel_path)
>     sbml_model = None
> 
>     if sbml_doc.getNumErrors() > 0:
>         print 'I couldn\'t read the file %s!' % biomodel_path

This should go to stderr. stdout is for normal program outputs.

>         return None

Also, Python has exception handling, which is usually a better solution 
than returning None or whatever.

>     else:

since you returned in the other branch, this else is useless

>         sbml_model = sbml_doc.getModel()
> 
>     return sbml_doc.getModel() # None if file couldn't be opened

You're calling  sbml_doc.getModel() a first time, binding the returned 
value to name sbml_model, then you're calling it a second time to return it.

A first fix:

import sys

def getSBMLModel(biomodel_path):
     reader = libsbml.SBMLReader()
     sbml_doc = reader.readSBML(biomodel_path)
     if sbml_doc.getNumErrors() > 0:
          # XXX : there's perhaps a better error message
          #       to get from sbml_doc ?
          print >> sys.stderr,  "I couldn't read the file %s!"\
                                 % biomodel_path
          return None

     return sbml_doc.getModel()


> 
> def way_1(biomodel_path):
>     reader = libsbml.SBMLReader()
>     sbml_doc = reader.readSBML(biomodel_path)
>     sbml_model = sbml_doc.getModel()
> 
>     if sbml_model == None:

Better to use the identity test here - None is garanteed to be a singleton:

       if sbml_model is None:

>         return
> 
>     l = sbml_model.getListOfSpecies()
>     print 'In way_1(): Got list %s with the length %i' % (l, len(l))
> 
> 
> def way_2(biomodel_path):
>     sbml_model = getSBMLModel(biomodel_path)
> 
>     if sbml_model == None:
>         return
> 
>     l = sbml_model.getListOfSpecies()
>     print 'In way_2(): Got list %s with the length %i' % (l, len(l))
> 
> 
> file = '../BIOMD0000000003.xml'

This shadows the builtin 'file' symbol. Better to use another name.

> # Changing the order of these two calls doesn't help, only way_1() works.
> way_1(file)
> way_2(file)
> 
> When run, the output is:
> In way_1(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
> type 'ListOfSpecies *' at 0x291c8bc> > with the length 3
> In way_2(): Got list <libsbml.ListOfSpecies; proxy of <Swig Object of 
> type 'ListOfSpecies *' at 0x27fb57c> > with the length 0
> 
> I don't get it way the species list obtained in way_2() is empty?

The only explanation I can imagine here would be that a second call to 
sbml_doc.getModel() doesn't return the same thing as the first... 
(remember, there are two calls in your getSBMLModel() function).

My 2 cents...


From steve at holdenweb.com  Thu Feb 12 06:56:38 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 12 Feb 2009 06:56:38 -0500
Subject: Functional schmunctional...
In-Reply-To: <00a501c98cd9$c8693620$0d00a8c0@hendrik>
References: <gmsnvi$ku$1@aioe.org> <gmt0pf$t6u$1@ger.gmane.org>
	<gmuo5k$tdt$1@ger.gmane.org>
	<00a501c98cd9$c8693620$0d00a8c0@hendrik>
Message-ID: <49940E76.4030007@holdenweb.com>

Hendrik van Rooyen wrote:
> "Steve Holden" <ste....nweb.com> wrote:
> 
>> Jeez, doesn't anyone read the fine manual any more? I hope this was just
>> an academic exercise.
>>
>>>>> socket.inet_ntoa(struct.pack("!l", 1000000000))
>> '59.154.202.0'
>> Holden's rule: when it looks simple enough to be worth including in the
>> standard library it may well already *be* in the standard library.
> 
> Aaah! But how do you find it, if you don't already know
> where it lives and what it's called ?
> 
Well, my usual answer would be "Ask on c.l.py", but it appears that's no
longer reliable. Jeez, doesn't anyone ... (rinse and repeat).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From __peter__ at web.de  Thu Feb 12 07:09:05 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 12 Feb 2009 13:09:05 +0100
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <gn13gv$2q3$01$1@news.t-online.com>

Fisherking wrote:

> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)

I'd assume the dictionaries to look like

{"phone": "0123...", "duration": 5.67, "calltime": "10:42"}

What do the different keys ("a", "b", "c") versus ("d", "e", "f") mean?
 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!

items = [dict(a=1, b=2), dict(a=1, b=2), dict(a=3, c=2), dict(a=3, c=2.2),
dict(a=3, c=2.6)]

# 2.5
seen = set()
for row in items:
    rowkey = frozenset(row.iteritems())
    if rowkey in seen:
        print "dupe", row
    else:
        seen.add(rowkey)

# 2.3 (and older); not tested
seen = {}
for row in items:
    rowkey = row.items()
    rowkey.sort()
    rowkey = tuple(rowkey)
    if rowkey in seen:
        print "dupe", row
    else:
        seen[rowkey] = 1

> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )

If you are content with detecting similarities on a single "axis":

def window(items):
    items = iter(items)
    prev = items.next()
    for cur in items:
        yield cur, prev
        prev = cur

def todict(k, v, rest):
    d = dict(rest)
    d[k] = v
    return d

axis = "c"
d = {}
eps = 0.5
for row in items:
    row = dict(row)
    try:
        value = row.pop(axis)
    except KeyError:
        pass
    else:
        key = frozenset(row.iteritems())
        d.setdefault(key, []).append(value)

for key, values in d.iteritems():
    if len(values) > 1:
        for cur, prev in window(sorted(values)):
            if abs(cur-prev) < eps:
                print "similar rows", todict(axis, cur, key), todict(axis,
prev, key)
 
Otherwise you have to define a distance function and use a clustering
algorithm. Segaran's "Programming Collective Intelligence" has some
examples in Python, though the code can hardly be called idiomatic.

Peter


From notvalid2 at sbcglobal.net  Thu Feb 12 07:43:11 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 04:43:11 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
Message-ID: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>

It appears if one moves between IDLE and pythonWin (pyWin) that two separate 
loops (threads?) can occur, and that IDLE can produce incorrect results. 
Since I have preferred IDLE over pyWin, that leaves me currently in a 
quandry. How do I renew these processes, so that I can proceed with IDLE?

I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach 
some understanding of what was going on. Killing these tasks didn't help 
restore order to IDLE. It seems my only choice now is to reboot? Comments?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From deets at nospam.web.de  Thu Feb 12 07:47:09 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 13:47:09 +0100
Subject: Library similar to UserAgent (perl)
References: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>
Message-ID: <6vik2dFk1ph9U1@mid.uni-berlin.de>

mattia wrote:

> Hi everybody, I'm looking for an easy way to put data in a form, then
> click the button and follow the redirect. Also I need to use cookies. I
> read that using perl this can be done using the UserAgent lib, that also
> provide th browser functionality to let the site believe that you are
> getting the pages from a normali browser like ff. Any suggestion? I think
> that the main concen is to easilly put the data in the numerous textlabel
> provided and then magically simulate the 'click me' button.

Python mechanize.

Diez


From comp.ogz at gmail.com  Thu Feb 12 08:38:03 2009
From: comp.ogz at gmail.com (Oguz Yarimtepe)
Date: Thu, 12 Feb 2009 15:38:03 +0200
Subject: xacml api info request
Message-ID: <20831c740902120538y2f0896bcw3a73067a0223bd2e@mail.gmail.com>

I am looking for how can i use XACML with Python. Anybody who had used xacml
with python or and idea?

Thanx.

-- 
O?uz Yar?mtepe
www.loopbacking.info
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From benjamin.kaplan at case.edu  Thu Feb 12 08:41:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 12 Feb 2009 08:41:53 -0500
Subject: cannot install
In-Reply-To: <9CB4135F-EACF-4DE5-B2C9-F0C20A3E8D69@volny.cz>
References: <46EB146D-6A7F-4457-A35D-CB0C388C19DB@volny.cz>
	<ec96e1390902090756p7868c4b5yc54d2b4b2b2f468e@mail.gmail.com>
	<5929AA4E-C3C7-42FE-93B0-6D1F11932B73@volny.cz>
	<ec96e1390902100535p7075ce98kf8ef72f8251f7b2a@mail.gmail.com>
	<9B4AFD7B-F159-44C5-95D5-A6FCC04548C7@volny.cz>
	<ec96e1390902110523u7cf76a01k738d535533bc10c7@mail.gmail.com>
	<9CB4135F-EACF-4DE5-B2C9-F0C20A3E8D69@volny.cz>
Message-ID: <ec96e1390902120541r120ad3dfm1232f07ac78c23ab@mail.gmail.com>

On Thu, Feb 12, 2009 at 3:41 AM, Vladim?r ?upka <vzupka at volny.cz> wrote:

> Here is config.log:
>
> This file contains any messages produced by compilers while
> running configure, to aid debugging if configure makes a mistake.
>
> It was created by python configure 3.0, which was
> generated by GNU Autoconf 2.61.  Invocation command line was
>
>   $ ./configure --enable-framework
>
> ## --------- ##
> ## Platform. ##
> ## --------- ##
>
> hostname = Macintosh.local
> uname -m = i386
> uname -r = 9.6.0
> uname -s = Darwin
> uname -v = Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008;
> root:xnu-1228.9.59~1/RELEASE_I386
>
> /usr/bin/uname -p = i386
> /bin/uname -X     = unknown
>
> /bin/arch              = unknown
> /usr/bin/arch -k       = unknown
> /usr/convex/getsysinfo = unknown
> /usr/bin/hostinfo      = Mach kernel version:
>  Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008;
> root:xnu-1228.9.59~1/RELEASE_I386
> Kernel configured for up to 2 processors.
> 2 processors are physically available.
> 2 processors are logically available.
> Processor type: i486 (Intel 80486)
> Processors active: 0 1
> Primary memory available: 4.00 gigabytes
> Default processor set: 101 tasks, 414 threads, 2 processors
> Load average: 1.02, Mach factor: 0.99
> /bin/machine           = unknown
> /usr/bin/oslevel       = unknown
> /bin/universe          = unknown
>
> PATH: /opt/local/bin
> PATH: /opt/local/sbin
> PATH: /Developer/usr/bin
> PATH: /usr/bin
> PATH: /bin
> PATH: /usr/sbin
> PATH: /sbin
> PATH: /Users/admin
> PATH: /usr/local/bin
> PATH: /usr/X11/bin
>
>
> ## ----------- ##
> ## Core tests. ##
> ## ----------- ##
>
> configure:1900: checking for --with-universal-archs
> configure:1912: result: 32-bit
> configure:2033: checking MACHDEP
> configure:2197: result: darwin
> configure:2208: checking machine type as reported by uname -m
> configure:2211: result: i386
> configure:2224: checking for --without-gcc
> configure:2250: result: no
> configure:2311: checking for gcc
> configure:2327: found /Developer/usr/bin/gcc
> configure:2338: result: gcc
> configure:2576: checking for C compiler version
> configure:2583: gcc --version >&5
> i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5490)
> Copyright (C) 2005 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> configure:2586: $? = 0
> configure:2593: gcc -v >&5
> Using built-in specs.
> Target: i686-apple-darwin9
> Configured with: /var/tmp/gcc/gcc-5490~1/src/configure --disable-checking
> -enable-werror --prefix=/usr --mandir=/share/man
> --enable-languages=c,objc,c++,obj-c++
> --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/
> --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib
> --build=i686-apple-darwin9 --with-arch=apple --with-tune=generic
> --host=i686-apple-darwin9 --target=i686-apple-darwin9
> Thread model: posix
> gcc version 4.0.1 (Apple Inc. build 5490)
> configure:2596: $? = 0
> configure:2603: gcc -V >&5
> gcc-4.0: argument to `-V' is missing
> configure:2606: $? = 1
> configure:2629: checking for C compiler default output file name
> configure:2656: gcc    conftest.c  >&5
> ld: library not found for -lcrt1.10.5.o
> collect2: ld returned 1 exit status
> configure:2659: $? = 1
> configure:2697: result:
> configure: failed program was:
> | /* confdefs.h.  */
> | #define _GNU_SOURCE 1
> | #define _NETBSD_SOURCE 1
> | #define __BSD_VISIBLE 1
> | #define _BSD_TYPES 1
> | #define _DARWIN_C_SOURCE 1
> | /* end confdefs.h.  */
> |
> | int
> | main ()
> | {
> |
> |   ;
> |   return 0;
> | }
> configure:2704: error: C compiler cannot create executables
> See `config.log' for more details.
>
> ## ---------------- ##
> ## Cache variables. ##
> ## ---------------- ##
>
> ac_cv_env_CC_set=
> ac_cv_env_CC_value=
> ac_cv_env_CFLAGS_set=
> ac_cv_env_CFLAGS_value=
> ac_cv_env_CPPFLAGS_set=
> ac_cv_env_CPPFLAGS_value=
> ac_cv_env_CPP_set=
> ac_cv_env_CPP_value=
> ac_cv_env_LDFLAGS_set=
> ac_cv_env_LDFLAGS_value=
> ac_cv_env_LIBS_set=
> ac_cv_env_LIBS_value=
> ac_cv_env_build_alias_set=
> ac_cv_env_build_alias_value=
> ac_cv_env_host_alias_set=
> ac_cv_env_host_alias_value=
> ac_cv_env_target_alias_set=
> ac_cv_env_target_alias_value=
> ac_cv_prog_ac_ct_CC=gcc
>
> ## ----------------- ##
> ## Output variables. ##
> ## ----------------- ##
>
> AR=''
> ARCH_RUN_32BIT=''
> BASECFLAGS=''
> BLDLIBRARY=''
> BLDSHARED=''
> BUILDEXEEXT=''
> CC='gcc'
> CCSHARED=''
> CFLAGS=''
> CFLAGSFORSHARED=''
> CONFIGURE_MACOSX_DEPLOYMENT_TARGET=''
> CONFIG_ARGS=' '\''--enable-framework'\'''
> CPP=''
> CPPFLAGS=''
> CXX=''
> DEFS=''
> DLINCLDIR=''
> DLLLIBRARY=''
> DYNLOADFILE=''
> ECHO_C='ECHO_N=''
> ECHO_T=''
> EGREP=''
> EXEEXT=''
> EXPORT_MACOSX_DEPLOYMENT_TARGET='#'
> FRAMEWORKALTINSTALLFIRST='frameworkinstallstructure bininstall maninstall'
> FRAMEWORKALTINSTALLLAST='frameworkinstallmaclib frameworkinstallapps
> frameworkaltinstallunixtools'
> FRAMEWORKINSTALLFIRST='frameworkinstallstructure'
> FRAMEWORKINSTALLLAST=''
> FRAMEWORKUNIXTOOLSPREFIX='/usr/local'
> GREP=''
> HAVE_GETHOSTBYNAME=''
> HAVE_GETHOSTBYNAME_R=''
> HAVE_GETHOSTBYNAME_R_3_ARG=''
> HAVE_GETHOSTBYNAME_R_5_ARG=''
> HAVE_GETHOSTBYNAME_R_6_ARG=''
> INSTALL_DATA=''
> INSTALL_PROGRAM=''
> INSTALL_SCRIPT=''
> INSTSONAME=''
> LDFLAGS=''
> LDLAST=''
> LDLIBRARY=''
> LDLIBRARYDIR=''
> LDSHARED=''
> LIBC=''
> LIBM=''
> LIBOBJS=''
> LIBRARY=''
> LIBS=''
> LIBTOOL_CRUFT=''
> LINKCC=''
> LINKFORSHARED=''
> LN=''
> LTLIBOBJS=''
> MACHDEP='darwin'
> MACHDEP_OBJS=''
> MAINCC=''
> OBJEXT=''
> OPT=''
> OTHER_LIBTOOL_OPT=''
> PACKAGE_BUGREPORT='http://www.python.org/python-bugs'<http://www.python.org/python-bugs%27>
> PACKAGE_NAME='python'
> PACKAGE_STRING='python 3.0'
> PACKAGE_TARNAME='python'
> PACKAGE_VERSION='3.0'
> PATH_SEPARATOR=':'
> PYTHONFRAMEWORK='Python'
> PYTHONFRAMEWORKDIR='Python.framework'
> PYTHONFRAMEWORKIDENTIFIER='org.python.python'
> PYTHONFRAMEWORKINSTALLDIR='/Library/Frameworks/Python.framework'
> PYTHONFRAMEWORKPREFIX='/Library/Frameworks'
> RANLIB=''
> RUNSHARED=''
> SGI_ABI=''
> SHELL='/bin/sh'
> SHLIBS=''
> SIGNAL_OBJS=''
> SO=''
> SOVERSION='1.0'
> SRCDIRS=''
> SVNVERSION=''
> THREADHEADERS=''
> THREADOBJ=''
> TRUE=''
> UNIVERSALSDK=''
> UNIVERSAL_ARCH_FLAGS=''
> USE_SIGNAL_MODULE=''
> USE_THREAD_MODULE=''
> VERSION='3.0'
> ac_ct_CC='gcc'
> bindir='${exec_prefix}/bin'
> build_alias=''
> datadir='${datarootdir}'
> datarootdir='${prefix}/share'
> docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
> dvidir='${docdir}'
> exec_prefix='NONE'
> host_alias=''
> htmldir='${docdir}'
> includedir='${prefix}/include'
> infodir='${datarootdir}/info'
> libdir='${exec_prefix}/lib'
> libexecdir='${exec_prefix}/libexec'
> localedir='${datarootdir}/locale'
> localstatedir='${prefix}/var'
> mandir='${datarootdir}/man'
> oldincludedir='/usr/include'
> pdfdir='${docdir}'
> prefix='/Library/Frameworks/Python.framework/Versions/3.0'
> program_transform_name='s,x,x,'
> psdir='${docdir}'
> sbindir='${exec_prefix}/sbin'
> sharedstatedir='${prefix}/com'
> sysconfdir='${prefix}/etc'
> target_alias=''
>
> ## ----------- ##
> ## confdefs.h. ##
> ## ----------- ##
>
> #define _GNU_SOURCE 1
> #define _NETBSD_SOURCE 1
> #define __BSD_VISIBLE 1
> #define _BSD_TYPES 1
> #define _DARWIN_C_SOURCE 1
>
> configure: exit 77
>
> On 11.2.2009, at 14:23, Benjamin Kaplan wrote:
>
>
>
> 2009/2/11 administrator <vzupka at volny.cz>
>
>> I tried as admin with Python-3.0 in my home directory but no success yet.
>> Is there another help?
>>
>> Macintosh:~ admin$ export
>> PATH=/opt/local/bin:/opt/local/sbin:/Developer/usr/bin:$PATH
>> Macintosh:~ admin$ echo $PATH
>>
>> /opt/local/bin:/opt/local/sbin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/admin:/usr/local/bin:/usr/X11/bin
>> Macintosh:~ admin$ cd ~/Python-3.0
>> Macintosh:Python-3.0 admin$ pwd
>> /Users/admin/Python-3.0
>> Macintosh:Python-3.0 admin$ sudo ./configure --enable-framework
>> checking for --with-universal-archs... 32-bit
>> checking MACHDEP... darwin
>> checking machine type as reported by uname -m... i386
>> checking for --without-gcc... no
>> checking for gcc... gcc
>> checking for C compiler default output file name...
>> *configure: error: C compiler cannot create executables*
>> See `config.log' for more details.
>> Macintosh:Python-3.0 admin$
>>
>
>
>
> What does config.log say?
>
>
>>
>> Hmm. Not much useful there. Do you have XCode installed? Maybe someone
else has seen this before and can help.
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From james at agentultra.com  Thu Feb 12 09:06:00 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 09:06:00 -0500
Subject: [ANN] TracShell 0.1 released
Message-ID: <85ab8rkawn.fsf@agentultra.com>


I tend to work a lot with Trac for project management and have always
found the browser interface to be a productivity killer. I always
wanted a simple command-line interface to Trac, but having never found
one I found a little free time and got off my laurels to make one.

TracShell 0.1 is an early release, but it works. So far you can only
query and view tickets, but planned updates include the obvious
ability to create and edit tickets. Future plans will allow browsing
of comments, change histories, attachments, and so forth.

Please consider it really beta. The code needs a little tidying up
around the edges. If you find any bugs, please report them and I'll
fix them ASAP. Ideas, suggestions, and contributions are welcome.

http://code.google.com/p/tracshell/

Cheers.


From deets at nospam.web.de  Thu Feb 12 09:07:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 15:07:43 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
Message-ID: <6viopfFkcasmU1@mid.uni-berlin.de>

W. eWatson wrote:

> It appears if one moves between IDLE and pythonWin (pyWin) that two
> separate loops (threads?) can occur, and that IDLE can produce incorrect
> results. Since I have preferred IDLE over pyWin, that leaves me currently
> in a quandry. How do I renew these processes, so that I can proceed with
> IDLE?
 
> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
> some understanding of what was going on. Killing these tasks didn't help
> restore order to IDLE. It seems my only choice now is to reboot? Comments?

Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
processes, including of course the main programs. Which *should* be
anything that is needed anyway. 

And you still seem to not understand what is really happening.

Working between pywin and idle is perfectly fine, they are separate
programs. You can start as many instances of a program as you want and
happily work with them. Even several instances of idle and pywin, unless
these come with some logic to prevent multiple starts  - some windows app
do that.

What does *NOT* work is writing a Tkinter-based app in idle, and to run it
*FROM INSIDE* idle. Instead, open your explorer and double-click on the
pyhton-file your app is in. That's all that there is to it.

Diez


From gideon.smeding at gmail.com  Thu Feb 12 09:08:51 2009
From: gideon.smeding at gmail.com (gideon)
Date: Thu, 12 Feb 2009 06:08:51 -0800 (PST)
Subject: An executable operational semantics for Python
Message-ID: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>

Hi everybody,

I've recently finished my Master's thesis on the semantics of Python.
In my thesis I define the semantics of Python by rewriting an abstract
machine. The sources that are used to produce my thesis can also be
compiled into a working interpreter. Hence I call it an 'executable'
semantics.

Anyone interested should have a look at the short intro I put on my
web page:
http://gideon.smdng.nl/2009/01/an-executable-operational-semantics-for-python/



From Krzysztof.Retel at googlemail.com  Thu Feb 12 09:53:49 2009
From: Krzysztof.Retel at googlemail.com (Krzysztof Retel)
Date: Thu, 12 Feb 2009 06:53:49 -0800 (PST)
Subject: TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
Message-ID: <f97de861-a59b-463b-9297-f1414bdf0815@z1g2000yqn.googlegroups.com>

On 12 Feb, 14:06, J Kenneth King <ja... at agentultra.com> wrote:
> I tend to work a lot with Trac for project management and have always
> found the browser interface to be a productivity killer. I always
> wanted a simple command-line interface to Trac, but having never found
> one I found a little free time and got off my laurels to make one.
>
> TracShell 0.1 is an early release, but it works. So far you can only
> query and view tickets, but planned updates include the obvious
> ability to create and edit tickets. Future plans will allow browsing
> of comments, change histories, attachments, and so forth.
>
> Please consider it really beta. The code needs a little tidying up
> around the edges. If you find any bugs, please report them and I'll
> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>
> http://code.google.com/p/tracshell/
>
> Cheers.

Nice work.

Maybe it would be worth building at some point vim or emacs interface.

Krzysztof


From notvalid2 at sbcglobal.net  Thu Feb 12 09:57:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 06:57:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <6viopfFkcasmU1@mid.uni-berlin.de>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
Message-ID: <2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>

Diez B. Roggisch wrote:
> W. eWatson wrote:
> 
>> It appears if one moves between IDLE and pythonWin (pyWin) that two
>> separate loops (threads?) can occur, and that IDLE can produce incorrect
>> results. Since I have preferred IDLE over pyWin, that leaves me currently
>> in a quandry. How do I renew these processes, so that I can proceed with
>> IDLE?
>  
>> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
>> some understanding of what was going on. Killing these tasks didn't help
>> restore order to IDLE. It seems my only choice now is to reboot? Comments?
> 
> Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
> processes, including of course the main programs. Which *should* be
> anything that is needed anyway. 
Done that. Been there. It doesn't work. If I take another py tkinter program 
and run it in IDLE, it *will work*. The current program goes boom.
> 
> And you still seem to not understand what is really happening.
Whether I understand it exactly or not is not the issue. The issue is how do 
I execute IDLE *now* to get the correct results it once allowed? The fact of 
the matter is that I was happily working in IDLE for days and hours. I 
encountered a problem in IDLE that seemed suspicious, so I then fired up 
pyWin to see if it gave the same results. It worked fine. Then my problems 
with IDLE got worse.
> 
> Working between pywin and idle is perfectly fine, they are separate
> programs. You can start as many instances of a program as you want and
> happily work with them. Even several instances of idle and pywin, unless
> these come with some logic to prevent multiple starts  - some windows app
> do that.
How could this be true; otherwise,  I wouldn't be complaining?
> 
> What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> pyhton-file your app is in. That's all that there is to it.
Personally, I like running entirely in IDLE.

If there is no other way than you suggested in "NOT work", then I may just 
uninstall pyWin.
> 
> Diez


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From btaylordesign at gmail.com  Thu Feb 12 10:13:58 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 12 Feb 2009 07:13:58 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
Message-ID: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>

Hello everyone,

I'm Brandon Taylor, senior web developer with the University of Texas
at Austin. We're using Python 2.6.1 and having a lot of difficulty
getting the cx_Oracle-5.0 library to install on one of our MacBooks
running OS X 10.5.6.

We can get cx_Oracle to compile, but after running setup.py install
and trying to import the library, we are getting an error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
___divdi3
  Referenced from: /Users/mas80/Library/Oracle/instantclient_10_2/
libclntsh.dylib.10.1
  Expected in: flat namespace


Can anyone shed some light on how we can solve this issue? It's a show
stopper for us of we can not connect to Oracle from Python.

Kind regards,
Brandon Taylor


From dear.jay.logan at gmail.com  Thu Feb 12 10:15:29 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 07:15:29 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <b999d3ed-96fc-41d0-8741-26059b0640fd@v38g2000yqb.googlegroups.com>

On Feb 11, 8:22?pm, Basilisk96 <basilis... at gmail.com> wrote:
> Hello all,
>
> I have the following function that uses an intermediate iterator
> "rawPairs":
>
> def MakePairs(path):
> ? ? import os
> ? ? import operator
> ? ? join = os.path.join
> ? ? rawPairs = (
> ? ? ? ? (join(path, s), func(s))
> ? ? ? ? for s in os.listdir(path)
> ? ? ? ? if func(s) is not None and func(s).endswith("some criterion")
> ? ? )
> ? ? #Use the second item in the pair as the sort criterion
> ? ? result = sorted(rawPairs, key=operator.itemgetter(1))
> ? ? return result
>
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration? ?Perhaps a lambda
> construct, but I am not sure how to go about it...?
>
> Cheers,
> Basilisk96

Hi,
Try something like this:

import os
from os.path import join
from itertools import ifilter #assuming 2.5 and earlier, for 3.0 just
use the filter builtin
from operator import itemgetter

def isvalid(pair):
    return (s[1] is not None) and s[1].endswith('some criteria')

def makepairs(path):
    pair_iter = ((join(path,s), func(s)) for s in os.listdir(path))
    pair_iter = ifilter(isvalid, pair_iter)
    result = sorted(pair_iter, key=itemgetter(1))

    return result




From james at agentultra.com  Thu Feb 12 10:26:13 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 10:26:13 -0500
Subject: TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
	<f97de861-a59b-463b-9297-f1414bdf0815@z1g2000yqn.googlegroups.com>
Message-ID: <8563jfk76y.fsf@agentultra.com>

Krzysztof Retel <Krzysztof.Retel at googlemail.com> writes:

> On 12 Feb, 14:06, J Kenneth King <ja... at agentultra.com> wrote:
>> I tend to work a lot with Trac for project management and have always
>> found the browser interface to be a productivity killer. I always
>> wanted a simple command-line interface to Trac, but having never found
>> one I found a little free time and got off my laurels to make one.
>>
>> TracShell 0.1 is an early release, but it works. So far you can only
>> query and view tickets, but planned updates include the obvious
>> ability to create and edit tickets. Future plans will allow browsing
>> of comments, change histories, attachments, and so forth.
>>
>> Please consider it really beta. The code needs a little tidying up
>> around the edges. If you find any bugs, please report them and I'll
>> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>>
>> http://code.google.com/p/tracshell/
>>
>> Cheers.
>
> Nice work.
>
> Maybe it would be worth building at some point vim or emacs interface.
>
> Krzysztof

Thanks. :)

I considered a native editor interface, but since both vi and emacs
can run a shell within a buffer, I decided to go with a more flexible
solution.

However, if someone wanted to, the actual code fetching and displaying
the data isn't tied directly to the shell interface. It could be
possible to dispatch calls from a native editor front-end if it
doesn't mind spawning a python interpreter (or keeping one running)
for each request.

Anyway, thanks for checking it out. Hope you find it useful. I do. :)


From ivanov.maxim at gmail.com  Thu Feb 12 10:27:44 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 07:27:44 -0800 (PST)
Subject: Could you recommend job schedulling solution?
References: <e6748982-4998-4450-879e-1606df1b99c1@k8g2000yqn.googlegroups.com>
	<mailman.9347.1234382437.3487.python-list@python.org>
Message-ID: <33403be1-8a8a-4e28-9d0e-12fbfd4b7510@j39g2000yqn.googlegroups.com>

>
> I think parallel python will take of that for you
> (http://www.parallelpython.com/)

I've found that RPyC (http://rpyc.wikidot.com/) is quite usefull for
my task.  It allows me to build RPC service which accepts ordinary
python function from client and return result in synchronous or
asynchronous way. Of course it is able to serve multiple clients and
it's forking server help me to solve GIL problems on intense
calculations inside Python code.

Some limitations are present, like the fact that you couldn't send on
execution any code which use C extensions which are not present on RPC
server, but I didn't expect this could work at all, so in general RPyC
makes me happy.


From xahlee at gmail.com  Thu Feb 12 10:30:26 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 12 Feb 2009 07:30:26 -0800 (PST)
Subject: some history of computing and celebrities [was lisp machine 
	keyboards]
References: <1935645c-5b26-4287-b492-cdb2834aa4c9@b38g2000prf.googlegroups.com>
Message-ID: <70d7a15d-6c9d-4145-b718-1e83cbac510e@40g2000prx.googlegroups.com>

On Feb 12, 7:28?am, Xah Lee <xah... at gmail.com> wrote:
> lisp machine keyboards.
>
> ? Knite keyboard. I think this is one of the earlist.http://world.std.com/~jdostale/kbd/Knight.html
>
> ? Symbolics earlier style keyboard (PN 364000), by Peter Painehttp://www.asl.dsl.pipex.com/symbolics/photos/IO/kbd-older.html
>
> Symbolics later model Symbolics keyboard PN 365407 Rev C
> at Joey Devilla's blog, several hi quality photoshttp://www.globalnerdy.com/2009/02/05/hacklabtos-lisp-machine-keyboard/
>
> also at Rainer site, with info on how to use it on mac os xhttp://lispm.dyndns.org/news?ID=NEWS-2008-07-27-1
>
> one of the most funny comment from Joey's blog is:
> ?Man, my pinkies are getting tired just looking at that thing.?
>
> of course, the most baroque, showy, with a fancy name is the
> Space-cadet keyboard
> ?http://xahlee.org/emacs/emacs_kb_shortcuts_pain.html
>
> Space-cadet! LOL.
>
> btw, how did that name came to be?
>
> ? Xah
> ?http://xahlee.org/
>
> ?


while nosing about lisp machines, i checked out the Wikipedia article
on Symbolics again:
 http://en.wikipedia.org/wiki/Symbolics

it's content has improved significantly since last year or so i
checked.

My firts daily use of computer or owning one is ~1991, and didn't
really become pro after 1995. So, lisp machines are before my time.
Though, i have already had some interest in lisp history and have
strong interest in the the history of how the motherfucking unix
tookover its/lisp/vms/whatnot war. Reading such history is usually not
easy, because you are bombarded with many OSes or technologies that
you are not familiar and really difficult to understand its situation
without having lived in the tech of that era...

anyhow, check out some of the interesting tidbits in the article:

?Symbolics staffers Dan Weinreb, David Moon, Neal Feinberg, Kent
Pitman, Scott McKay, Sonya Keene and others made significant
contributions to the emerging Common Lisp language standard from the
mid-1980s through the release of the ANSI Common Lisp standard in
1994?

There, Dan Weinred, Kent Pitman, 2 guy who still write here sometimes,
are mentioned. (Kent i knew as a online acquaintance since ~2000 here.
Dan i knew only last year.)

Also note how Richard Stallman, who the open sourcing or FSF fuckheads
take to be a god unquestioned, who was at the time simply doing
questionable deeds. (note that in general, history doesn't have a
right and wrong. How came out as winner, is the hero.)

Given the Symbolic vs MIT/RMS situation, one can question what is the
interpersonal relation or formal relation between these people with
RMS. (in general, often many historical issue or truth cannot be
discussed when the persons are still alive, for many real life
complexities.)

Also of interest is tat Scott McKay, the Sun Micro guy, is there
too...

O, a wee bit of rambling.

?Advances in garbage collection techniques by Henry Baker, David Moon
and others, particularly the first commercial use of generational
scavenging, allowed Symbolics computers to run large Lisp programs for
months at a time.?

interesting to me is seeing the name Henry Baker. He has wrote a few
articles i've came cross in the past and enjoyed.

? ?Buffer Overflow? Security Problems, (2001), by Henry G Baker
  http://catless.ncl.ac.uk/Risks/21.84.html#subj10.1

? Communications of the ACM 34, 4 (April 1991), 18. Henry G Baker,
1990. (On the harm of speed)
 http://home.pipeline.com/~hbaker1/letters/CACM-DubiousAchievement.html

? ?Iterators: Signs of Weakness in Object-Oriented Languages? (1992)
By Henry G Baker.
http://home.pipeline.com/~hbaker1/Iterator.html

I'm posting this to python group too, for the last article above about
iterators. I whole heartedly agree to all Henry's opinions... often
today's hotshot programing morons have no understanding fuck. Python 3
is going full with iterators and enumerators fuck.

i'd link to few articles i wrote pertinent to some of the above
issues... but think rather not, since i've already done that often.

  Xah
? http://xahlee.org/

?



From ivanov.maxim at gmail.com  Thu Feb 12 10:31:57 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 07:31:57 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
References: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>
Message-ID: <68b98811-6352-4b84-952a-c5e0209e8bd3@x9g2000yqk.googlegroups.com>

> ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
> lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
> ___divdi3

You didn't link cx_Oracle.so all libs which it use. run "ldd -r
cx_Oracle.so" and you'll have an idea about all missing symbols. The
names of missed symbols could give you an idea what else should
cx_Oracle.so should be linked with



From GDoermann at gmail.com  Thu Feb 12 10:44:57 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 07:44:57 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
Message-ID: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>

Ok, so I noticed some of the modules (such as many of the datetime
attributes) are read-only, which means the __setattr__ and __set__
methods are intercepted... pretty easy.  I am looking for a way to
automate this.  The real goal is not to have read only attributes, but
to have getters and setters that are automatically called when a
property is called.  The getting is pretty easily achieved by setting
the metaclass which also creates the properties.  What I have so far
will protect the get_ and set_ methods as well as the properties that
call the get methods.  The reasoning for this is that I don't want
someone accidentally overwriting the property when the class uses a
private class variable.  What I have so far:



class ReadOnlyMeta(type):
	def __new__(cls, name, bases, methoddict):
		pname = '_%s__protected_items' %(name)
		protected = [pname]
		methoddict[pname] = protected
		for key, value in methoddict.items():
			if key.startswith("get_"):
				methoddict[key[4:]] = property(value)
				protected.append(key[4:])
				protected.append(key)
			elif key.startswith("set_"):
				protected.append(key)
		return type.__new__(cls, name, bases, methoddict)

class ReadOnly(object):
	__metaclass__ = ReadOnlyMeta

	def __check_private(self, name, msg = None):
		if name in self.__protected_items:
			if msg is None:
				msg = "'%s' of '%s' is Read only." %(name,
self.__class__.__name__)
			raise AttributeError(msg)

	def __setattr__(self, name, value):
		self.__check_private(name, "attribute '%s' of '%s' objects is not
writable" %(name, self.__class__.__name__))
		self.__dict__[name] = value

	def __delattr__(self, name):
		self.__check_private(name, "attribute '%s' of '%s' objects cannot be
removed" %(name, self.__class__.__name__))
		self.__dict__.pop(name)

	def __set__(self, instance, value):
		self.__check_private(instance, "You cannot remap the method '%s'" %
(instance))
		self.__dict__[instance] = value



I then implement this by creating a subclass of the read only class:

class MyClass(ReadOnly):
	def __init__(self, x):
		self.set_x(x)

	def get_x(self):
		return self.__x

	def set_x(self, x):
		print 'Hello the setter was called!'
		self.__x = x


What I want is to be able to auto-call the set_ methods whenever
someone tries to call a method that has a setter.  This could be done
by each class... tedious!  I want automation!  To do this I have tried
adding a list of setters to the metaclass and then in the __set__ and
__setattr__ methods I check to see if 'set_%s' %(variable) exists in
the list... if it does I call the method.  This would work, however
there are two lists of setters (in the example above), the ReadOnly
list and a MyClass list.  When you print out a dir(self) IN the
ReadOnly class from an implementation (MyClass) it will show the
MyClass attributes, however they cannot be called from the parent
class... so my real question... how can you (or can you ever) call a
child method from a parent class without explicitly passing the
callable?

I hope this hasn't been too confusing... or made your head hurt like
mine does...  If you want more code examples of what I have tried and
the out put... I'd be happy to give them.

Greg






From deets at nospam.web.de  Thu Feb 12 10:55:55 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 16:55:55 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
Message-ID: <6viv4bFk8gonU1@mid.uni-berlin.de>

> Done that. Been there. It doesn't work. If I take another py tkinter
> program and run it in IDLE, it *will work*. The current program goes boom.

That's pure luck then. IDLE is written in Tkinter, and *running* Tkinter
apps inside of it is bound to fail sooner or later. Failure might be as
drastic as termination of IDLE, or just some glitches.

This has hit numerous people before, as you've been told several times now.
What makes you think it doesn't affect you?

>> 
>> And you still seem to not understand what is really happening.
> Whether I understand it exactly or not is not the issue. The issue is how
> do I execute IDLE *now* to get the correct results it once allowed? The
> fact of the matter is that I was happily working in IDLE for days and
> hours. I encountered a problem in IDLE that seemed suspicious, so I then
> fired up pyWin to see if it gave the same results. It worked fine. Then my
> problems with IDLE got worse.
>> 
>> Working between pywin and idle is perfectly fine, they are separate
>> programs. You can start as many instances of a program as you want and
>> happily work with them. Even several instances of idle and pywin, unless
>> these come with some logic to prevent multiple starts  - some windows app
>> do that.
> How could this be true; otherwise,  I wouldn't be complaining?

Coincidence? When Mom tells me the car broke down after she passed by the
bakery, I don't assume one has to do with the other either.

>> What does *NOT* work is writing a Tkinter-based app in idle, and to run
>> it *FROM INSIDE* idle. Instead, open your explorer and double-click on
>> the pyhton-file your app is in. That's all that there is to it.
> Personally, I like running entirely in IDLE.

This is not a question of your liking, it's a question of technical
feasibility.

if you have been working happily for hours and days as you tell us, I can
only hope & assume that you made actual progress. Which might have brought
your own program to a point where it wasn't tolerable working from within
idle anymore. That you in the meanttime chose to work with Pywin is
irrelevant to that.
 
> If there is no other way than you suggested in "NOT work", then I may just
> uninstall pyWin.

Do so if you like - cargo cult programming isn't uncommon these days.

Diez


From GDoermann at gmail.com  Thu Feb 12 10:58:32 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 07:58:32 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
Message-ID: <61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com>

Oh... one other thing that would be really cool is to do this with AOP/
descriptors!  I just haven't been able to get that to work either.
Basics...

@readonly
class MyClass(object):
        def __init__(self, x):
                self.set_x(x)

        def get_x(self):
                return self.__x

        def set_x(self, x):
                print 'Hello the setter was called!'
                self.__x = x

and it's done!  I don't think this will work because (maybe I'm wrong)
but I don't think you can set the metaclass in the descriptor???  If
this is the case, it is more work to do the AOP and set a metaclass...
better to just inherit.  If it can be done... that would be awesome!

Greg


From catherine.heathcote at gmail.com  Thu Feb 12 11:03:05 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:03:05 GMT
Subject: Embarrasing questio
Message-ID: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>

But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
trying to do something simple, the python equivilent of:

if(i % 3 == 0 || i % 5 == 0)

Thanks.


From GDoermann at gmail.com  Thu Feb 12 11:07:13 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:07:13 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>

On Feb 12, 9:03?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> trying to do something simple, the python equivilent of:
>
> if(i % 3 == 0 || i % 5 == 0)
>
> Thanks.

if i % 3  == 0 or i % 5 == 0



From GDoermann at gmail.com  Thu Feb 12 11:07:48 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:07:48 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>

On Feb 12, 9:03?am, Catherine Heathcote
<catherine.heathc... at gmail.com> wrote:
> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> trying to do something simple, the python equivilent of:
>
> if(i % 3 == 0 || i % 5 == 0)
>
> Thanks.

in 2.5 and above you can do
if any(i%3 == 0, i%5 == 0)


From aahz at pythoncraft.com  Thu Feb 12 11:11:51 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 Feb 2009 08:11:51 -0800
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
Message-ID: <gn1ho7$ckj$1@panix3.panix.com>

In article <ZKXkl.34048$Sp5.7221 at text.news.virginmedia.com>,
Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>
>But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
>trying to do something simple, the python equivilent of:
>
>if(i % 3 == 0 || i % 5 == 0)

if i % 3 == 0 or i % 5 == 0:

You may find it worthwhile to quickly step through everything in the
standard Python tutorial, it covers lots of stuff like this.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From catherine.heathcote at gmail.com  Thu Feb 12 11:12:03 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:12:03 GMT
Subject: Embarrasing questio
In-Reply-To: <6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<6296e1bc-d572-4cd9-bbe1-5784d01d0a73@f40g2000pri.googlegroups.com>
Message-ID: <nTXkl.34053$Sp5.19612@text.news.virginmedia.com>

TechieInsights wrote:
> On Feb 12, 9:03 am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
>>
>> Thanks.
> 
> if i % 3  == 0 or i % 5 == 0
> 

Yea, new it would be embarrasing, thanks!


From google at mrabarnett.plus.com  Thu Feb 12 11:12:11 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 16:12:11 +0000
Subject: Breaking Python list into set-length list of lists
In-Reply-To: <4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>
References: <8158439d-faae-4889-a1cf-8d9fee112e9b@v39g2000yqm.googlegroups.com>
	<4cf62c27-ce57-4101-83a8-34285db537ff@a12g2000yqm.googlegroups.com>
Message-ID: <49944A5B.8070307@mrabarnett.plus.com>

Mensanator wrote:
> On Feb 11, 10:58?pm, Jason <elgrandchig... at gmail.com> wrote:
>> Hey everyone--
>>
>> I'm pretty new to Python, & I need to do something that's incredibly
>> simple, but combing my Python Cookbook & googling hasn't helped me out
>> too much yet, and my brain is very, very tired & flaccid @ the
>> moment....
>>
>> I have a list of objects, simply called "list". ?I need to break it
>> into an array (list of lists) wherein each sublist is the length of
>> the variable "items_per_page". ?So array[0] would go from array[0][0]
>> to array[0][items_per_page], then bump up to array[1][0] - array[1]
>> [items_per_page], until all the items in the original list were
>> accounted for.
>>
>> What would be the simplest way to do this in Python? ?And yes, I
>> realize I should probably be taking Programming 101.....
> 
>>>> items_per_page = 20
>>>> x = range(113)
>>>> layout = divmod(113,20)
>>>> if layout[1]>0:
> 	pages = layout[0]+1
> else:
> 	pages = layout[0]
>>>> array = [ x[i*items_per_page:i*items_per_page+items_per_page]  for i in xrange(pages)]
>>>> array
> [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
> 19], [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
> 36, 37, 38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
> 53, 54, 55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
> 70, 71, 72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86,
> 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102,
> 103, 104, 105, 106, 107, 108, 109, 110, 111, 112]]
 >
Using list comprehension:

 >>> my_list = range(113)
 >>> items_per_page = 20
 >>>
 >>> array = [my_list[start : start + items_per_page] for start in 
range(0, len(my_list), items_per_page)]
 >>>
 >>> array
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19], 
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 
38, 39], [40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 
55, 56, 57, 58, 59], [60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 
72, 73, 74, 75, 76, 77, 78, 79], [80, 81, 82, 83, 84, 85, 86, 87, 88, 
89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99], [100, 101, 102, 103, 104, 
105, 106, 107, 108, 109, 110, 111, 112]]
 >>>


From bearophileHUGS at lycos.com  Thu Feb 12 11:14:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 12 Feb 2009 08:14:22 -0800 (PST)
Subject: An executable operational semantics for Python
References: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>
Message-ID: <b11993c2-b37d-4cb0-9e2c-018c70532671@t3g2000yqa.googlegroups.com>

gideon:
> I've recently finished my Master's thesis on the semantics of Python.
> In my thesis I define the semantics of Python by rewriting an abstract
> machine. The sources that are used to produce my thesis can also be
> compiled into a working interpreter. Hence I call it an 'executable'
> semantics.

Can it be used for some useful purpose?

Bye,
bearophile


From bearophileHUGS at lycos.com  Thu Feb 12 11:16:42 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 12 Feb 2009 08:16:42 -0800 (PST)
Subject: Another optimization request :-)
References: <fda354ef-087e-4335-b071-599c41f12e4a@t3g2000yqa.googlegroups.com>
Message-ID: <080baa3d-0bbf-4d46-8142-5401ec206395@l16g2000yqo.googlegroups.com>

On Feb 12, 2:48?am, jeffg <jeffgem... at gmail.com> wrote:
> If anyone wants to take this on... I would really really like to have
> the spring_layout modified to support multi-threading if at all
> possible.

You can start creating a compiled Python extension using ShedSkin, it
may be enough.

Bye,
bearophile


From michele.simionato at gmail.com  Thu Feb 12 11:19:39 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 12 Feb 2009 08:19:39 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
Message-ID: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>

On Feb 12, 5:07?pm, TechieInsights <GDoerm... at gmail.com> wrote:
> On Feb 12, 9:03?am, Catherine Heathcote
>
> <catherine.heathc... at gmail.com> wrote:
> > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > trying to do something simple, the python equivilent of:
>
> > if(i % 3 == 0 || i % 5 == 0)
>
> > Thanks.
>
> in 2.5 and above you can do
> if any(i%3 == 0, i%5 == 0)

You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
the idiomatic solution is to use or).


From catherine.heathcote at gmail.com  Thu Feb 12 11:20:03 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Thu, 12 Feb 2009 16:20:03 GMT
Subject: Embarrasing questio
In-Reply-To: <gn1ho7$ckj$1@panix3.panix.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<gn1ho7$ckj$1@panix3.panix.com>
Message-ID: <T_Xkl.34055$Sp5.14840@text.news.virginmedia.com>

Aahz wrote:
> In article <ZKXkl.34048$Sp5.7221 at text.news.virginmedia.com>,
> Catherine Heathcote  <catherine.heathcote at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just 
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
> 
> if i % 3 == 0 or i % 5 == 0:
> 
> You may find it worthwhile to quickly step through everything in the
> standard Python tutorial, it covers lots of stuff like this.

I did, though perhapse a little to quickly! lol


From srikrishnamohan at gmail.com  Thu Feb 12 11:24:02 2009
From: srikrishnamohan at gmail.com (km)
Date: Fri, 13 Feb 2009 01:24:02 +0900
Subject: Embarrasing questio
In-Reply-To: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>

Hi,

you could do it this way also :

if i in [3,5]:
    do something...

KM
~~~~~~~~~~~~~~~~~~~~~
On Fri, Feb 13, 2009 at 1:19 AM, Michele Simionato <
michele.simionato at gmail.com> wrote:

> On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
> > On Feb 12, 9:03 am, Catherine Heathcote
> >
> > <catherine.heathc... at gmail.com> wrote:
> > > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > > trying to do something simple, the python equivilent of:
> >
> > > if(i % 3 == 0 || i % 5 == 0)
> >
> > > Thanks.
> >
> > in 2.5 and above you can do
> > if any(i%3 == 0, i%5 == 0)
>
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From dear.jay.logan at gmail.com  Thu Feb 12 11:27:09 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 08:27:09 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com>
Message-ID: <a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com>

On Feb 12, 10:58?am, TechieInsights <GDoerm... at gmail.com> wrote:
> Oh... one other thing that would be really cool is to do this with AOP/
> descriptors! ?I just haven't been able to get that to work either.
> Basics...
>
> @readonly
> class MyClass(object):
> ? ? ? ? def __init__(self, x):
> ? ? ? ? ? ? ? ? self.set_x(x)
>
> ? ? ? ? def get_x(self):
> ? ? ? ? ? ? ? ? return self.__x
>
> ? ? ? ? def set_x(self, x):
> ? ? ? ? ? ? ? ? print 'Hello the setter was called!'
> ? ? ? ? ? ? ? ? self.__x = x
>
> and it's done! ?I don't think this will work because (maybe I'm wrong)
> but I don't think you can set the metaclass in the descriptor??? ?If
> this is the case, it is more work to do the AOP and set a metaclass...
> better to just inherit. ?If it can be done... that would be awesome!
>
> Greg

Are your needs not already satisfied by the Python built-in property?

http://docs.python.org/dev/3.0/library/functions.html#property


From digitig at gmail.com  Thu Feb 12 11:28:35 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 12 Feb 2009 16:28:35 +0000
Subject: Embarrasing questio
In-Reply-To: <f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
	<f4cc03640902120824j69bc6f85u2f8c6a9a6d2d1a1e@mail.gmail.com>
Message-ID: <aee48b3c0902120828s4189ccb3t4737d2ee4a8a8179@mail.gmail.com>

2009/2/12 km <srikrishnamohan at gmail.com>:
> Hi,
>
> you could do it this way also :
>
> if i in [3,5]:
>     do something...

True, you could do it, but it would be wrong. The original is true for
i = 6, 9, 10, 12 and so on, but yours doesn't seem to be...

-- 
Tim Rowe


From GDoermann at gmail.com  Thu Feb 12 11:30:00 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:30:00 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com> 
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <0c5dfe48-8625-4aca-b126-7c7b4f70f123@r41g2000prr.googlegroups.com>

On Feb 12, 9:19?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 12, 5:07?pm, TechieInsights <GDoerm... at gmail.com> wrote:
>
> > On Feb 12, 9:03?am, Catherine Heathcote
>
> > <catherine.heathc... at gmail.com> wrote:
> > > But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> > > trying to do something simple, the python equivilent of:
>
> > > if(i % 3 == 0 || i % 5 == 0)
>
> > > Thanks.
>
> > in 2.5 and above you can do
> > if any(i%3 == 0, i%5 == 0)
>
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).

Thanks... my mistake


From GDoermann at gmail.com  Thu Feb 12 11:32:37 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 08:32:37 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com>
Message-ID: <7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com>

On Feb 12, 9:27?am, josh logan <dear.jay.lo... at gmail.com> wrote:
> On Feb 12, 10:58?am, TechieInsights <GDoerm... at gmail.com> wrote:
>
>
>
> > Oh... one other thing that would be really cool is to do this with AOP/
> > descriptors! ?I just haven't been able to get that to work either.
> > Basics...
>
> > @readonly
> > class MyClass(object):
> > ? ? ? ? def __init__(self, x):
> > ? ? ? ? ? ? ? ? self.set_x(x)
>
> > ? ? ? ? def get_x(self):
> > ? ? ? ? ? ? ? ? return self.__x
>
> > ? ? ? ? def set_x(self, x):
> > ? ? ? ? ? ? ? ? print 'Hello the setter was called!'
> > ? ? ? ? ? ? ? ? self.__x = x
>
> > and it's done! ?I don't think this will work because (maybe I'm wrong)
> > but I don't think you can set the metaclass in the descriptor??? ?If
> > this is the case, it is more work to do the AOP and set a metaclass...
> > better to just inherit. ?If it can be done... that would be awesome!
>
> > Greg
>
> Are your needs not already satisfied by the Python built-in property?
>
> http://docs.python.org/dev/3.0/library/functions.html#property

yea... just read the docs... I love reinventing the wheel (sarcasm)...

Thanks for this... I just realized that you can set the fset and fdel
to None... so everything can be done from the metaclass!


From kyosohma at gmail.com  Thu Feb 12 11:36:32 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 12 Feb 2009 08:36:32 -0800 (PST)
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de> 
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
Message-ID: <4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>

On Feb 12, 8:57?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> Diez B. Roggisch wrote:
> > W. eWatson wrote:
>
> >> It appears if one moves between IDLE and pythonWin (pyWin) that two
> >> separate loops (threads?) can occur, and that IDLE can produce incorrect
> >> results. Since I have preferred IDLE over pyWin, that leaves me currently
> >> in a quandry. How do I renew these processes, so that I can proceed with
> >> IDLE?
>
> >> I noticed that I had about 10-15 copies of pythonw.exe as I tried to reach
> >> some understanding of what was going on. Killing these tasks didn't help
> >> restore order to IDLE. It seems my only choice now is to reboot? Comments?
>
> > Gosh no, rebooting shouldn't be needed. Just quit all idle & pywin
> > processes, including of course the main programs. Which *should* be
> > anything that is needed anyway.
>
> Done that. Been there. It doesn't work. If I take another py tkinter program
> and run it in IDLE, it *will work*. The current program goes boom.
>
> > And you still seem to not understand what is really happening.
>
> Whether I understand it exactly or not is not the issue. The issue is how do
> I execute IDLE *now* to get the correct results it once allowed? The fact of
> the matter is that I was happily working in IDLE for days and hours. I
> encountered a problem in IDLE that seemed suspicious, so I then fired up
> pyWin to see if it gave the same results. It worked fine. Then my problems
> with IDLE got worse.
>
> > Working between pywin and idle is perfectly fine, they are separate
> > programs. You can start as many instances of a program as you want and
> > happily work with them. Even several instances of idle and pywin, unless
> > these come with some logic to prevent multiple starts ?- some windows app
> > do that.
>
> How could this be true; otherwise, ?I wouldn't be complaining?
>
> > What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> > *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> > pyhton-file your app is in. That's all that there is to it.
>
> Personally, I like running entirely in IDLE.
>
> If there is no other way than you suggested in "NOT work", then I may just
> uninstall pyWin.
>
>
>
> > Diez
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

I like IDLE too. However, I've experienced seemingly random crashes
when programming wxPython programs in it. As already stated, the
mainloops clash from time to time. So now I use Wingware or just edit
the files in IDLE and run the program by double-click or via command
line.

Mike


From google at mrabarnett.plus.com  Thu Feb 12 11:37:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 16:37:10 +0000
Subject: Match items in large list
In-Reply-To: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <49945036.70309@mrabarnett.plus.com>

Fisherking wrote:
> Hi,
> 
> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)
> 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!
> 
> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )
> 
> In the second part of this program I need to take each of these items
> (similar items are treated as one) and find these in a database that
> contains 2.5M posts!
> 
> The python version I am bound to is Python 2.3
> 
The best way of looking for duplicates is to make a dict or set of the
items. Unfortunately a dict isn't hashable, so it can't be a key.
Therefore I suggest you convert the dicts into tuples, which are
hashable:

counts = {}
for d in my_list:
     d_as_list = d.items()
     # Standardise the order so that identical dicts become identical 
tuples.
     d_as_list.sort()
     key = tuple(d_as_list)
     if key in counts:
         counts[key] += 1
     else:
         counts[key] = 1


From notvalid2 at sbcglobal.net  Thu Feb 12 11:44:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 08:44:56 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <6viv4bFk8gonU1@mid.uni-berlin.de>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<6viv4bFk8gonU1@mid.uni-berlin.de>
Message-ID: <DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>

I simply ask, "How do I get around the problem?"

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Thu Feb 12 11:50:14 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 08:50:14 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
Message-ID: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>

As with Diez, I simply ask, "How do I get around the problem?" Are you two 
telling me that it is impossible?

OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and have 
  good familiarity with Tkinter? If so, I'll send you the code and you can 
try it yourself. My guess is that it will work, and if not, and you are 
sufficiently skilled with Tkinter and debugging, you may find the problem in 
the code. The steps to create the problem are very easy.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jfabiani at yolo.com  Thu Feb 12 11:55:28 2009
From: jfabiani at yolo.com (John Fabiani)
Date: Thu, 12 Feb 2009 08:55:28 -0800
Subject: openOffic, windows, and Python 2.5
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>
	<mailman.9360.1234388663.3487.python-list@python.org>
Message-ID: <suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>

Terry Reedy wrote:

> John Fabiani wrote:
>> Hi,
>> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).
> 
> I presume because no one has volunteered to do the update for the Py-UNO
> bridge.  In any case, why do you consider that to be a problem.  It is
> common for apps to include the Python they are known to work with.
> 
> tjr

Thanks for the response.  The reason is the others apps are written in
python 2.5.x.  All the testing was done on Linux using 2.5 and now we need
it to work on the windows side too.  


From n.kottiyath at gmail.com  Thu Feb 12 11:55:58 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Thu, 12 Feb 2009 08:55:58 -0800 (PST)
Subject: Spam
Message-ID: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>

Hi,
   There seems to be lot of spam coming in this newsgroup.
   Is it possible to have some mechanism similar to say - slashdot -
wherein mails can be moderated by any of the usual users?
   This is required only for people who is posting for the first time
(or people who has been rated spam before). Second post onwards, no
moderation required.
    Just wondering.



From notvalid2 at sbcglobal.net  Thu Feb 12 12:01:19 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 09:01:19 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <%AYkl.16675$yr3.11280@nlpi068.nbdc.sbc.com>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?
> 
> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.
> 
Well, this may be a bit trickier than I thought. I'd have to give you the 
same PIL, tkinter, numpy libraries the program users. However, I"m willing 
to send the files for them to you. Here's the start of the code

=====================
from Tkinter import *
from numpy import *
import Image
import ImageChops
import ImageTk
import ImageDraw # wtw
import time
import binascii
import tkMessageBox
import tkSimpleDialog
from pylab import plot, xlabel, ylabel, title, show, xticks, bar

from tkFileDialog import asksaveasfilename, asksaveasfile
from tkFileDialog import askopenfilename

import MakeQTE
=======================
You'd also need clut.txt, wagon.gif, and MakQTE. All small files.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From apt.shansen at gmail.com  Thu Feb 12 12:09:22 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 09:09:22 -0800
Subject: Spam
In-Reply-To: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
Message-ID: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>

>   There seems to be lot of spam coming in this newsgroup.
>   Is it possible to have some mechanism similar to say - slashdot -
> wherein mails can be moderated by any of the usual users?
>   This is required only for people who is posting for the first time
> (or people who has been rated spam before). Second post onwards, no
> moderation required.
>    Just wondering.

C.P.L is an unmoderated newsgroup: so there's no content controls on
posts. I don't think that's possible to change. But I haven't gotten
directly near a newsgroup-as-a-newsgroup in eons, so I may be wrong.

If you subscribe to C.P.L as a mailing list instead of a newsgroup, I
believe most of the spam gets filtered out at the mailing list<->news
group gateway by the Python.org spam filters... At least no spam in my
Gmail spam folder appears to be flagged from this group(at a very
brief glance) so they appear to be doing quite well.

http://mail.python.org/mailman/listinfo/python-list is the list
subscription page.

(C.P.L and python-list are essentially the same thing: things posted
to the list get forwarded to the newsgroup, and vice-versa)

--S


From apt.shansen at gmail.com  Thu Feb 12 12:10:02 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 09:10:02 -0800
Subject: Spam
In-Reply-To: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
Message-ID: <7a9c25c20902120910h560a6bc7qfae73d456a9634e2@mail.gmail.com>

> C.P.L

C.L.P even.

Ahem.

--S


From google at mrabarnett.plus.com  Thu Feb 12 12:22:30 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 12 Feb 2009 17:22:30 +0000
Subject: Embarrasing questio
In-Reply-To: <f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
Message-ID: <49945AD6.5060400@mrabarnett.plus.com>

Michele Simionato wrote:
> On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
>> On Feb 12, 9:03 am, Catherine Heathcote
>>
>> <catherine.heathc... at gmail.com> wrote:
>>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>>> trying to do something simple, the python equivilent of:
>>> if(i % 3 == 0 || i % 5 == 0)
>>> Thanks.
>> in 2.5 and above you can do
>> if any(i%3 == 0, i%5 == 0)
> 
> You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> the idiomatic solution is to use or).
> 
any() is really only useful with a generator, otherwise you're always
evaluating both conditions, unlike the solution with 'or'.


From python.list at tim.thechases.com  Thu Feb 12 12:23:29 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 12 Feb 2009 11:23:29 -0600
Subject: Spam
In-Reply-To: <7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
Message-ID: <49945B11.9030007@tim.thechases.com>

> If you subscribe to C.P.L as a mailing list instead of a
> newsgroup, I believe most of the spam gets filtered out at the
> mailing list<->news group gateway by the Python.org spam
> filters... At least no spam in my Gmail spam folder appears to
> be flagged from this group(at a very brief glance) so they
> appear to be doing quite well.

Allow  me to take this opportunity to thank the folks that *are* 
doing/managing this spam-filtering of the mailing list side of 
things -- the drastic drop in spam (from 6+ months back) is much 
appreciated!

Though I guess this thread does beg the question:  is there a way 
to read the filtered mailing list with a newsreader (via NNTP) 
instead of getting it delivered via email or subjecting oneself 
to the spamminess of c.l.p?  I like some of the "kill-thread" 
types of options I've got on the NNTP side of readers that aren't 
as readily available to me on the email side of things 
(Thunderbird allows for thread-kills in News, but not in email).

-tkc






From tjreedy at udel.edu  Thu Feb 12 12:24:43 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 12:24:43 -0500
Subject: Avoiding argument checking in recursive calls
In-Reply-To: <pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>	<mailman.9320.1234344687.3487.python-list@python.org>
	<pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <gn1m0m$60e$1@ger.gmane.org>

Steven D'Aprano wrote:
> On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:
> 
>>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>> def fact(n):
>>>>     if n < 0: raise ValueError
>>>>     if n = 0: return 1
>>>>     return fact(n-1)*n
>>>>
>>>> At the risk of premature optimization, I wonder if there is an idiom
>>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>>> recursive calls?
>> Reverse the test order
>>
>> def fact(n):
>>      if n > 0: return fact(n-1)*n
>>      if n == 0: return 1
>>      raise ValueError
>>
>> You must test recursive versus terminal case every call in any case.
>> Nearly always, the first test passes and second is not done. You only
>> test n==0 once, either to terminate or raise exception. This works for
>> any integral value and catches non-integral values. (There is some delay
>> for that, but only bad calls are penalized.)
> 
> Nice try, but in fact no.

I meant non-integral numbers.  Others inputs are outside the usual spec 
for fact().  You asked about "an idiom for avoiding the unnecessary test 
for n <= 0 in the subsequent recursive calls?" and I gave you that.  You 
should have thanked me.

>>>> fact(None)  # works okay
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 4, in fact
> ValueError
>>>> fact({})
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 2, in fact
> TypeError: unsupported operand type(s) for -: 'dict' and 'int'
> 
> You're relying on arbitrary ordering of types in Python 2.x,

No I'm not.  I don't even know what you mean by that claim.

> and of course in Python 3 that fails altogether.

In 3.0, which is what I use, the comparison 'n>0' raises an exception 
for non-numbers, as it should.  To me, that is success.  What else would 
you want?

Terry Jan Reedy



From travis+ml-python at subspacefield.org  Thu Feb 12 12:26:19 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 12 Feb 2009 11:26:19 -0600
Subject: zlib interface semi-broken
In-Reply-To: <20090210205739.GT6522@subspacefield.org>
References: <20090210205739.GT6522@subspacefield.org>
Message-ID: <20090212172619.GG6522@subspacefield.org>

So I've submitted a patch to bugs.python.org to add a new member
called is_finished to the zlib decompression object.

Issue 5210, file 13056, msg 81780
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From GDoermann at gmail.com  Thu Feb 12 12:27:07 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 09:27:07 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com> 
	<7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com>
Message-ID: <6531a55c-194d-432c-acc4-612700abf935@w24g2000prd.googlegroups.com>

Ok... for some closure I have written a class to automate the
process.  It takes getters and setters and deleters and then sets the
property automatically.  Sweet!


class AutoProperty(type):
	def __new__(cls, name, bases, methoddict):
		processed = []
		getter = 'get_'
		setter = 'set_'
		deleter = 'del_'

		starters = {getter:PropertyAttr(getter, PropertyAttr.FGET),
					setter:PropertyAttr(setter, PropertyAttr.FSET),
					deleter:PropertyAttr(deleter, PropertyAttr.FDEL)
					}
		for key, value in methoddict.items():
			var = None
			for start in starters.keys():
				if key.startswith(start):
					var = key[len(start):]
					break
			if var is None or var in processed:
				continue
			property_values = []

			for start in starters.keys():
				if '%s%s' %(start, var) in methoddict.keys():
					property_values.append(starters[start].tostring(var))
				else:
					property_values.append(starters[start].tostring(None))
			property_map = 'methoddict["%s"] = property(%s)' %(var, ','.join
(property_values))
			exec(property_map)
		return type.__new__(cls, name, bases, methoddict)

class PropertyAttr(object):
	FGET = 'fget'
	FSET = 'fset'
	FDEL = 'fdel'
	def __init__(self, start, type = FGET):
		self.start = start
		self.type = type

	def tostring(self, var):
		if self.type == self.FSET:
			vars = ['v']
		else:
			vars = []
		fullvar = ['self'] + vars
		if var is None:
			return '%s=None' %(self.type)
		return '%s=lambda %s: self.%s%s(%s)' %(self.type, ','.join(fullvar),
self.start, var, ','.join(vars))

class ReadOnly(object):
	__metaclass__ = AutoProperty


class MyClass(ReadOnly):
	def __init__(self, x, y):
		self.__x = x
		self.__y = y

	def get_x(self):
		return self.__x

	def set_x(self, x):
		self.__x = x

	def get_y(self):
		return self.__y

mc = MyClass(10, 100)
print mc.x, mc.y
mc.x = 10
print mc.x
try:
	mc.y = 100
except AttributeError:
	print 'Yea it worked!'

try:
	del mc.y
except AttributeError:
	print "It's read only!"

And the output:
10 100
10
Yea it worked!
It's read only!


Now to work on descriptors doing it for you.


From GDoermann at gmail.com  Thu Feb 12 12:30:30 2009
From: GDoermann at gmail.com (TechieInsights)
Date: Thu, 12 Feb 2009 09:30:30 -0800 (PST)
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com> 
	<mailman.9412.1234459418.3487.python-list@python.org>
Message-ID: <b6faf0e8-bd5d-4d15-9b45-20f0a2bf57cc@r15g2000prd.googlegroups.com>

On Feb 12, 10:23?am, Tim Chase <python.l... at tim.thechases.com> wrote:
> > If you subscribe to C.P.L as a mailing list instead of a
> > newsgroup, I believe most of the spam gets filtered out at the
> > mailing list<->news group gateway by the Python.org spam
> > filters... At least no spam in my Gmail spam folder appears to
> > be flagged from this group(at a very brief glance) so they
> > appear to be doing quite well.
>
> Allow ?me to take this opportunity to thank the folks that *are*
> doing/managing this spam-filtering of the mailing list side of
> things -- the drastic drop in spam (from 6+ months back) is much
> appreciated!
>
> Though I guess this thread does beg the question: ?is there a way
> to read the filtered mailing list with a newsreader (via NNTP)
> instead of getting it delivered via email or subjecting oneself
> to the spamminess of c.l.p? ?I like some of the "kill-thread"
> types of options I've got on the NNTP side of readers that aren't
> as readily available to me on the email side of things
> (Thunderbird allows for thread-kills in News, but not in email).
>
> -tkc

Enhancement request for google: hide messages by a certain author

it would be individually set, but can get rid of a lot of junk at
once.


From tjreedy at udel.edu  Thu Feb 12 12:36:20 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 12:36:20 -0500
Subject: Match items in large list
In-Reply-To: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
Message-ID: <gn1mmg$8mv$1@ger.gmane.org>

Fisherking wrote:
> Hi,
> 
> I hope you can help me with this optimizing problem!
> I have a large list of dictionaries (about 250 000 of them). Two or
> more of these dictionaries contains the same data (not more than five
> or six of them per item) e.g. [{'a':1,'b':'2','c':3} , {'d':
> 4,'e':'5','f':6},{'a':1,'b':'2','c':3} , {'d':4,'e':'5','f':6},...].
> (the dictionaries are really containg phone numbers, duration time and
> call time.)
> 
> Which are the best way of searching through the list and extract the
> items that are the same. In the first run I want to find every item
> that are the same as {'a':1,'b':'2','c':3}, the second {'d':
> 4,'e':'5','f':6} etc. The list are not read-only and I can pop them
> out of the list when I have found them!

Popping items out of the middle of a list is a slow O(n) operation.
MRAB's set of tuples is what I would have suggested.

> 
> (How can I found items that are almost the same? e.g. {'a':
> 1,'b':'2','c':3.1} and {'a':1,'b':'2','c':3.2} )
> 
> In the second part of this program I need to take each of these items
> (similar items are treated as one) and find these in a database that
> contains 2.5M posts!
> 
> The python version I am bound to is Python 2.3

For that, dict of tuples (with fake value == None) might be faster than 
the add-on set module.



From travis+ml-python at subspacefield.org  Thu Feb 12 12:38:12 2009
From: travis+ml-python at subspacefield.org (Travis)
Date: Thu, 12 Feb 2009 11:38:12 -0600
Subject: how to distribute python extensions independently of python
Message-ID: <20090212173812.GH6522@subspacefield.org>

So,

Recently I made a fix to the zlib module that I need for use at work.

I would like other employees to be able to use it without recompiling python.

I assume I can just rename it and distribute it as a python extension.

I was wondering how I can provide a way for other employees to build it.

I saw a "Universal Unix Makefile for Python extensions" that looks promising.

Is this the accepted way to compile python extensions still?
-- 
Crypto ergo sum.  http://www.subspacefield.org/~travis/
Do unto other faiths as you would have them do unto yours.
If you are a spammer, please email john at subspacefield.org to get blacklisted.


From deets at nospam.web.de  Thu Feb 12 12:38:19 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 18:38:19 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <6vj54bFjd14jU1@mid.uni-berlin.de>

W. eWatson wrote:

> As with Diez, I simply ask, "How do I get around the problem?" Are you two
> telling me that it is impossible?

YES. That's what we and all the others who answered to you in the other
thread are telling you, repeatedly. It is impossible. Really. No kidding.
For sure. Jawoll, ganz sicher sogar.

Diez


From andrew at acooke.org  Thu Feb 12 12:42:15 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 14:42:15 -0300 (CLST)
Subject: Spam
In-Reply-To: <49945B11.9030007@tim.thechases.com>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
Message-ID: <15b8ac796d4482926d373b153409383c.squirrel@localhost>


A quick search on "imap nntp" turned up this list that might be useful -
http://deflexion.com/messaging/ although I wonder when it was written
because I remember using Aaron's RSS to email aggregator when RSS was
new(!).

It mentions gmane, though, which certainly still exists (I assume it
carries this list too).  And this page suggests you can read gmane via
nntp - http://reticule.gmane.org/

Aha!  yes!  It;s in the FAQ :o)

  Can I read news via secure NNTP (nntps)?
  Yes. Point your news reader towards nntps://snews.gmane.org/.

http://www.gmane.org/faq.php

I should be working; I will try that this evening.  What was the name of
the client that threaded messages with a cute ascii tree?!

Cheers,
Andrew


Tim Chase wrote:
> Though I guess this thread does beg the question:  is there a way
> to read the filtered mailing list with a newsreader (via NNTP)




From michele.simionato at gmail.com  Thu Feb 12 12:44:26 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 12 Feb 2009 09:44:26 -0800 (PST)
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com> 
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com> 
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com> 
	<mailman.9411.1234459347.3487.python-list@python.org>
Message-ID: <589cecad-6edd-4a9f-ae84-0791b37d292a@m42g2000yqb.googlegroups.com>

On Feb 12, 6:22?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> Michele Simionato wrote:
> > On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
> >> On Feb 12, 9:03 am, Catherine Heathcote
>
> >> <catherine.heathc... at gmail.com> wrote:
> >>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
> >>> trying to do something simple, the python equivilent of:
> >>> if(i % 3 == 0 || i % 5 == 0)
> >>> Thanks.
> >> in 2.5 and above you can do
> >> if any(i%3 == 0, i%5 == 0)
>
> > You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
> > the idiomatic solution is to use or).
>
> any() is really only useful with a generator, otherwise you're always
> evaluating both conditions, unlike the solution with 'or'.

Indeed.


From andrew at acooke.org  Thu Feb 12 12:45:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 14:45:33 -0300 (CLST)
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <ea16a4820bbc415f36a51a2b6d371745.squirrel@localhost>


You might want to read
https://www.dfwpython.org/repo/Presentations/2008-10-04-PyArkansas-PythonEggsIntro/eggs-introduction.pdf

It covers a lot of ground; I used it to work out how to distribute a pure
Python package, but I am sure it mentions compiled packages too.  In my
case I ended up using setuptools (easy_install) and distutils.

(Not sure if you asking just about compiling, or more general packaging,
but IIRC it covers both).

Andrew


Travis wrote:
> So,
>
> Recently I made a fix to the zlib module that I need for use at work.
>
> I would like other employees to be able to use it without recompiling
> python.
>
> I assume I can just rename it and distribute it as a python extension.
>
> I was wondering how I can provide a way for other employees to build it.
>
> I saw a "Universal Unix Makefile for Python extensions" that looks
> promising.
>
> Is this the accepted way to compile python extensions still?
> --
> Crypto ergo sum.  http://www.subspacefield.org/~travis/
> Do unto other faiths as you would have them do unto yours.
> If you are a spammer, please email john at subspacefield.org to get
> blacklisted.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From Scott.Daniels at Acm.Org  Thu Feb 12 12:51:16 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 12 Feb 2009 09:51:16 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <h8mdnbQXu5KJ_AnUnZ2dnUVZ_heWnZ2d@pdx.net>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?
> 
> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.

They are telling you the truth, and you are replying, "I don't
want to understand, I just want it to work."  They have shown great
forbearance.  The only time I have debugged any Tkinter code in IDLE,
I have start with "python -m idlelib.idle -n" and accepted the fact
that I will see crashes.  The one advantage of my technique is that
I can hand-execute single Tkinter operations and see the results
immediately since I am running piggyback on IDLE's main loop.

Once more, though I'm sure you don't want to hear it:
     Normally IDLE starts as a program running that talks to the user
(idle.py). It starts a separate process that talks to the user interface
over a TCP/IP port and does the things inside the shell (for
example the expression evaluation).  When you use the command
"Shell / Restart Shell," the process that interacts with your program
is wiped out and new process is started (I think, perhaps they simply
flush almost everything and restart).  The reason only one IDLE session
can live at a time is that a TCP/IP communication port has only two
ends.  If you don't kill _all_ of the pythonw processes, something will
go wrong in the initial setting up the parent/child processes.

     Similarly, a GUI is not a library, but a framework.  The GUI itself
is the main program (run after you do some setup) that calls parts of
your program as subroutines.  You have a problem when you use a GUI to
debug another GUI (there can be only _one_ main program).  It does no
good to stomp your foot and proclaim that you want it to work.
Sometimes your code doesn't interfere too badly with IDLE's GUI, so it
looks as if you have gotten away with it.  For example, in-process IDLE
(the "-n" flag) fiddles with the Tkinter environment in an attempt to
reduce the conflict between IDLE's and your program's use of the GUI.

The only solutions I've seen for debugging GUIs involve separated
processes (even more so than IDLE), running on separate machines.
With those, you don't share a keyboard, mouse, or display between
the debugger and the program under test.  Such solutions are available
for a price.  ActiveState, for example, sells one.

The issue in each case is sharing things that the programs have
every right to expect that they "own."  To wit, Display refresh points,
the main program, the keyboard, tcp/ip ports, the mouse.

--Scott David Daniels
Scott.Daniels at Acm.Org


From maksym.kaban at gmail.com  Thu Feb 12 12:53:04 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 09:53:04 -0800 (PST)
Subject: something wrong with isinstance
Message-ID: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>

Hi there.
now i'm a complete newbie for python, and maybe my problem is stupid
but i cannot solve it myself

i have an object of class GeoMap which contains lists with objects of
GeoMapCell (i will not explain what they should do, hope its not
important). Then i want to serialize these objects to json notation.
So i imported json module and as shown in docs for it extended
JSONEncoder class.  Look at the code below

##main module
from worldmap import GeoMap, GeoMapCell

import testdata
import json

class GeoMapEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, GeoMap):
            return None
        return json.JSONEncoder.default(self, obj)

def main():
    print(json.dumps(2 + 5j, cls=ComplexEncoder))

    geomap = testdata.createTestMap()
    print(json.dumps(geomap, cls=GeoMapEncoder))
    pass

if __name__ == '__main__':
    main()

===========

##worldmap module
class GeoMap:
    cells = []
    activerow = 0
    activecol = 0

    def addCell(self, acell):
        if len(self.cells) == 0:
          self.cells.append([])
          self.activerow = 0
        acell.col = self.activerow
        acell.row = self.activecol
        self.cells[self.activerow].append(acell)
        self.activecol += 1

    def addRow(self):
        self.cells.append([])
        self.activerow += 1;
        self.activecol = 0;

class GeoMapCell:
    neighbours = (None, None, None, None, None, None, )
    col = 0
    row = 0

The problem is in here.

class GeoMapEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, GeoMap):  ## <=======   isinstance doesnot
work as i expected
            return None
        return json.JSONEncoder.default(self, obj)

 Though obj is object of GeoMap class, isinstance returns False. Where
was i mistaken. If i shouldn't use isinstance, then what function
would check class of object?

Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
PyScript


From tjreedy at udel.edu  Thu Feb 12 13:00:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 13:00:54 -0500
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
Message-ID: <gn1o4i$e6v$1@ger.gmane.org>

W. eWatson wrote:
> As with Diez, I simply ask, "How do I get around the problem?" Are you 
> two telling me that it is impossible?

Try this analogy.  One television, two stubborn kids that want to watch 
different programs.  One has the remote, the other the buttons on the 
TV.  What happens?  How do you make both happy.  Solve that and get rich 
;-).

Even better analogy.  One inbox.  Two people on opposite sides each want 
'first dibs' on each item that drops.  How do you make them both happy, 
especially if they are equally stubborn clones?


> OK, here's my offer to both of you. Do you have IDLE for Python 2.5 and 
> have  good familiarity with Tkinter? If so, I'll send you the code and 
> you can try it yourself. My guess is that it will work, and if not, and 
> you are sufficiently skilled with Tkinter and debugging, you may find 
> the problem in the code. The steps to create the problem are very easy.

That is a request, not an offer.



From hniksic at xemacs.org  Thu Feb 12 13:02:28 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 12 Feb 2009 19:02:28 +0100
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
	<f23f5859-c7cd-4694-a0a1-adcea61e5ae4@j1g2000yqi.googlegroups.com>
	<mailman.9411.1234459347.3487.python-list@python.org>
	<589cecad-6edd-4a9f-ae84-0791b37d292a@m42g2000yqb.googlegroups.com>
Message-ID: <874oyzjzyj.fsf@mulj.homelinux.net>

Michele Simionato <michele.simionato at gmail.com> writes:

> On Feb 12, 6:22?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
>> Michele Simionato wrote:
>> > On Feb 12, 5:07 pm, TechieInsights <GDoerm... at gmail.com> wrote:
>> >> On Feb 12, 9:03 am, Catherine Heathcote
>>
>> >> <catherine.heathc... at gmail.com> wrote:
>> >>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> >>> trying to do something simple, the python equivilent of:
>> >>> if(i % 3 == 0 || i % 5 == 0)
>> >>> Thanks.
>> >> in 2.5 and above you can do
>> >> if any(i%3 == 0, i%5 == 0)
>>
>> > You are missing a few parenthesis: if any([i%3 == 0, i%5 == 0]) (but
>> > the idiomatic solution is to use or).
>>
>> any() is really only useful with a generator, otherwise you're always
>> evaluating both conditions, unlike the solution with 'or'.
>
> Indeed.

any(f() for f in (lambda: i % 3 == 0, lambda: i % 5 == 0))

:-)


From invalid at invalid  Thu Feb 12 13:06:09 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 12 Feb 2009 12:06:09 -0600
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
Message-ID: <UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>

On 2009-02-12, andrew cooke <andrew at acooke.org> wrote:

>   Can I read news via secure NNTP (nntps)?
>   Yes. Point your news reader towards nntps://snews.gmane.org/.
>
> http://www.gmane.org/faq.php
>
> I should be working; I will try that this evening.  What was the name of
> the client that threaded messages with a cute ascii tree?!

slrn?

-- 
Grant Edwards                   grante             Yow! How's the wife?
                                  at               Is she at home enjoying
                               visi.com            capitalism?


From cosmo_general at yahoo.com  Thu Feb 12 13:11:44 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Thu, 12 Feb 2009 10:11:44 -0800 (PST)
Subject: Help: makefile in Windows
Message-ID: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>

Hi Folks,

I am learning Extending Python, by testing the demo script of
Programming Python. In the book, a makefile for Linux is there, but I
am using Windows currently. I wish somebody would help me to get a
makefile for Windows, my makefile.linux is as below:

PYDIR= c:\Python25
PY = $(PYDIR)

hello.so: hello.c
        gcc hello.c -g -I$(PY)/include -I$(PY) -fpic -share -o
hello.so
clean:
       rm hello.so core



Thanks a lot!


Muddy Colder


From dear.jay.logan at gmail.com  Thu Feb 12 13:11:50 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Thu, 12 Feb 2009 10:11:50 -0800 (PST)
Subject: Read Only attributes, auto properties and getters and setters
References: <8090b400-dde2-4fc2-8d73-6d1bad3b5aeb@z6g2000pre.googlegroups.com>
	<61e02f4c-6006-4051-9ad4-9de11bceacea@o6g2000pre.googlegroups.com> 
	<a0cc8233-cee8-44cf-ae22-9a8a95010091@x10g2000yqk.googlegroups.com> 
	<7301e264-0364-4d93-afb3-522f013c1c2e@40g2000prx.googlegroups.com> 
	<6531a55c-194d-432c-acc4-612700abf935@w24g2000prd.googlegroups.com>
Message-ID: <b2c1ca74-8d2e-457d-95a2-5f69e5d3b499@s20g2000yqh.googlegroups.com>

On Feb 12, 12:27?pm, TechieInsights <GDoerm... at gmail.com> wrote:
> Ok... for some closure I have written a class to automate the
> process. ?It takes getters and setters and deleters and then sets the
> property automatically. ?Sweet!
>
> class AutoProperty(type):
> ? ? ? ? def __new__(cls, name, bases, methoddict):
> ? ? ? ? ? ? ? ? processed = []
> ? ? ? ? ? ? ? ? getter = 'get_'
> ? ? ? ? ? ? ? ? setter = 'set_'
> ? ? ? ? ? ? ? ? deleter = 'del_'
>
> ? ? ? ? ? ? ? ? starters = {getter:PropertyAttr(getter, PropertyAttr.FGET),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? setter:PropertyAttr(setter, PropertyAttr.FSET),
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? deleter:PropertyAttr(deleter, PropertyAttr.FDEL)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? }
> ? ? ? ? ? ? ? ? for key, value in methoddict.items():
> ? ? ? ? ? ? ? ? ? ? ? ? var = None
> ? ? ? ? ? ? ? ? ? ? ? ? for start in starters.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? if key.startswith(start):
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? var = key[len(start):]
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? break
> ? ? ? ? ? ? ? ? ? ? ? ? if var is None or var in processed:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? continue
> ? ? ? ? ? ? ? ? ? ? ? ? property_values = []
>
> ? ? ? ? ? ? ? ? ? ? ? ? for start in starters.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? if '%s%s' %(start, var) in methoddict.keys():
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? property_values.append(starters[start].tostring(var))
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? property_values.append(starters[start].tostring(None))
> ? ? ? ? ? ? ? ? ? ? ? ? property_map = 'methoddict["%s"] = property(%s)' %(var, ','.join
> (property_values))
> ? ? ? ? ? ? ? ? ? ? ? ? exec(property_map)
> ? ? ? ? ? ? ? ? return type.__new__(cls, name, bases, methoddict)
>
> class PropertyAttr(object):
> ? ? ? ? FGET = 'fget'
> ? ? ? ? FSET = 'fset'
> ? ? ? ? FDEL = 'fdel'
> ? ? ? ? def __init__(self, start, type = FGET):
> ? ? ? ? ? ? ? ? self.start = start
> ? ? ? ? ? ? ? ? self.type = type
>
> ? ? ? ? def tostring(self, var):
> ? ? ? ? ? ? ? ? if self.type == self.FSET:
> ? ? ? ? ? ? ? ? ? ? ? ? vars = ['v']
> ? ? ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? ? ? ? ? vars = []
> ? ? ? ? ? ? ? ? fullvar = ['self'] + vars
> ? ? ? ? ? ? ? ? if var is None:
> ? ? ? ? ? ? ? ? ? ? ? ? return '%s=None' %(self.type)
> ? ? ? ? ? ? ? ? return '%s=lambda %s: self.%s%s(%s)' %(self.type, ','.join(fullvar),
> self.start, var, ','.join(vars))
>
> class ReadOnly(object):
> ? ? ? ? __metaclass__ = AutoProperty
>
> class MyClass(ReadOnly):
> ? ? ? ? def __init__(self, x, y):
> ? ? ? ? ? ? ? ? self.__x = x
> ? ? ? ? ? ? ? ? self.__y = y
>
> ? ? ? ? def get_x(self):
> ? ? ? ? ? ? ? ? return self.__x
>
> ? ? ? ? def set_x(self, x):
> ? ? ? ? ? ? ? ? self.__x = x
>
> ? ? ? ? def get_y(self):
> ? ? ? ? ? ? ? ? return self.__y
>
> mc = MyClass(10, 100)
> print mc.x, mc.y
> mc.x = 10
> print mc.x
> try:
> ? ? ? ? mc.y = 100
> except AttributeError:
> ? ? ? ? print 'Yea it worked!'
>
> try:
> ? ? ? ? del mc.y
> except AttributeError:
> ? ? ? ? print "It's read only!"
>
> And the output:
> 10 100
> 10
> Yea it worked!
> It's read only!
>
> Now to work on descriptors doing it for you.

I think I'll stick with the built-in, Thanks :)


From andrew at acooke.org  Thu Feb 12 13:14:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 15:14:33 -0300 (CLST)
Subject: Spam
In-Reply-To: <UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
	<UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
Message-ID: <032621e9f3f550d0b980acb9d9cfa40e.squirrel@localhost>

Grant Edwards wrote:
>> I should be working; I will try that this evening.  What was the name of
>> the client that threaded messages with a cute ascii tree?!
>
> slrn?

i think i was remembering trn, which is now apparently dead.  will try
slrn...  thanks, andrew




From ptmcg at austin.rr.com  Thu Feb 12 13:14:36 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 12 Feb 2009 10:14:36 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com>

On Feb 12, 11:53?am, maksym.ka... at gmail.com wrote:
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
>
> i have an object of class GeoMap which contains lists with objects of
> GeoMapCell (i will not explain what they should do, hope its not
> important). Then i want to serialize these objects to json notation.
> So i imported json module and as shown in docs for it extended
> JSONEncoder class. ?Look at the code below
>
> ##main module
> from worldmap import GeoMap, GeoMapCell
>
> import testdata
> import json
>
> class GeoMapEncoder(json.JSONEncoder):
> ? ? def default(self, obj):
> ? ? ? ? if isinstance(obj, GeoMap):
> ? ? ? ? ? ? return None
> ? ? ? ? return json.JSONEncoder.default(self, obj)
>
> def main():
> ? ? print(json.dumps(2 + 5j, cls=ComplexEncoder))
>
> ? ? geomap = testdata.createTestMap()
> ? ? print(json.dumps(geomap, cls=GeoMapEncoder))
> ? ? pass
>
> if __name__ == '__main__':
> ? ? main()
>
> ===========
>
> ##worldmap module
> class GeoMap:
> ? ? cells = []
> ? ? activerow = 0
> ? ? activecol = 0
>
> ? ? def addCell(self, acell):
> ? ? ? ? if len(self.cells) == 0:
> ? ? ? ? ? self.cells.append([])
> ? ? ? ? ? self.activerow = 0
> ? ? ? ? acell.col = self.activerow
> ? ? ? ? acell.row = self.activecol
> ? ? ? ? self.cells[self.activerow].append(acell)
> ? ? ? ? self.activecol += 1
>
> ? ? def addRow(self):
> ? ? ? ? self.cells.append([])
> ? ? ? ? self.activerow += 1;
> ? ? ? ? self.activecol = 0;
>
> class GeoMapCell:
> ? ? neighbours = (None, None, None, None, None, None, )
> ? ? col = 0
> ? ? row = 0
>
> The problem is in here.
>
> class GeoMapEncoder(json.JSONEncoder):
> ? ? def default(self, obj):
> ? ? ? ? if isinstance(obj, GeoMap): ?## <======= ? isinstance doesnot
> work as i expected
> ? ? ? ? ? ? return None
> ? ? ? ? return json.JSONEncoder.default(self, obj)
>
> ?Though obj is object of GeoMap class, isinstance returns False. Where
> was i mistaken. If i shouldn't use isinstance, then what function
> would check class of object?
>
> Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
> PyScript

Here's a crazy idea out of left field.  Just before calling
isinstance, why not try:

print(type(obj))
print(str(obj))

This may illuminate the unexpected behavior, you'll find out just what
obj has in it.

-- Paul


From aahz at pythoncraft.com  Thu Feb 12 13:25:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 12 Feb 2009 10:25:38 -0800
Subject: Spam
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<mailman.9417.1234460556.3487.python-list@python.org>
	<UdydnaFERIeM-AnUnZ2dnUVZ_hadnZ2d@posted.visi>
	<mailman.9420.1234462487.3487.python-list@python.org>
Message-ID: <gn1pj2$5pn$1@panix3.panix.com>

In article <mailman.9420.1234462487.3487.python-list at python.org>,
andrew cooke <andrew at acooke.org> wrote:
>Grant Edwards wrote:
>>> I should be working; I will try that this evening.  What was the name of
>>> the client that threaded messages with a cute ascii tree?!
>>
>> slrn?
>
>i think i was remembering trn, which is now apparently dead.  will try
>slrn...  thanks, andrew

trn 3.6 works fine for me ... just as it has for almost twenty years.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From maksym.kaban at gmail.com  Thu Feb 12 13:26:14 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 10:26:14 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com>
Message-ID: <2d88e036-a529-4364-9fcb-e8fe7446827e@g38g2000yqd.googlegroups.com>

> Here's a crazy idea out of left field. ?Just before calling
> isinstance, why not try:
>
> print(type(obj))
> print(str(obj))
>
> This may illuminate the unexpected behavior, you'll find out just what
> obj has in it.
>
> -- Paul

Well the output of
> print(type(obj))
> print(str(obj))

was

<class 'worldmap.GeoMap'>
<worldmap.GeoMap object at 0x01DD17B0>

Just looks well, isn't it? i have no idea what's wrong


From tjreedy at udel.edu  Thu Feb 12 13:48:45 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 13:48:45 -0500
Subject: openOffic, windows, and Python 2.5
In-Reply-To: <suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>
References: <kp6dnXpXiPMHtw7UnZ2dnUVZ_g2dnZ2d@wavecable.com>	<mailman.9360.1234388663.3487.python-list@python.org>
	<suSdncDqwI4dyQnUnZ2dnUVZ_s3inZ2d@wavecable.com>
Message-ID: <gn1qu8$o9p$1@ger.gmane.org>

John Fabiani wrote:
> Terry Reedy wrote:
> 
>> John Fabiani wrote:
>>> Hi,
>>> OpenOffice 3 on windows uses python 2.3.x (I have no idea why).
>> I presume because no one has volunteered to do the update for the Py-UNO
>> bridge.  In any case, why do you consider that to be a problem.  It is
>> common for apps to include the Python they are known to work with.
>>
>> tjr
> 
> Thanks for the response.  The reason is the others apps are written in
> python 2.5.x.  All the testing was done on Linux using 2.5 and now we need
> it to work on the windows side too.  

Have you tried it?  What breaks?  Win OOo's use of 2.3 should only 
affect Python code that you run within the OO process itself, with its 
copy of Python.  Avoiding things introduced in 2.4/2.5 is probably 
easier than recompiling OOo on Windows.



From ivanov.maxim at gmail.com  Thu Feb 12 13:49:52 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Thu, 12 Feb 2009 10:49:52 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>

Don't really sure, but try to define your class as new-style one.
Like
class GeoMap(object):
   ...



From maksym.kaban at gmail.com  Thu Feb 12 13:59:03 2009
From: maksym.kaban at gmail.com (maksym.kaban at gmail.com)
Date: Thu, 12 Feb 2009 10:59:03 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <b0189430-e2ec-454d-ae21-f8f442dbc03f@d32g2000yqe.googlegroups.com>

On 12 ???, 21:49, redbaron <ivanov.ma... at gmail.com> wrote:
> Don't really sure, but try to define your class as new-style one.
> Like
> class GeoMap(object):
> ? ?...

Sorry, it didn't work


From jura.grozni at gmail.com  Thu Feb 12 14:15:36 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 11:15:36 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
Message-ID: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>

To be honest, in compare to Visual Studio, Gui Builders for wx widgets
are really bad. Also completly for python there is not one good
GuiBuilder. The only one I have seen that would come near VS was
BoaConstructor, But the number of Bugs is just horrific. Too bad that
no one is developing it further.

Do you know if there is any project curently running for GUI builders,
maybe for WX, That I could maybe join.


From benjamin at python.org  Thu Feb 12 14:22:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 12 Feb 2009 19:22:32 +0000 (UTC)
Subject: =?utf-8?b?X19pbXBvcnRfXw==?= Confusion
References: <5e61a9a8-7caa-4dfc-9454-aa8eddb8e593@z1g2000yqn.googlegroups.com>
Message-ID: <loom.20090212T192047-728@post.gmane.org>

 <scott.bronson.nelson <at> gmail.com> writes:

> 
> Can someone explain to me what's going on here?
> 
> >>> __import__('some.package.module', {}, {}, [])
> <module 'some' from 'some/__init__.py'>
> >>> __import__('some.package.module', {}, {}, [''])
> <module 'some.package.module' from 'some/package/module.py'>

As documented [1], unless fromlist is not empty, the first module is returned.
Use the solution at the end of the docs to get around this.


[1] http://docs.python.org/library/functions.html#__import__



From btaylordesign at gmail.com  Thu Feb 12 14:24:05 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Thu, 12 Feb 2009 11:24:05 -0800 (PST)
Subject: cx_Oracle-5.0 Problem
References: <7fa4a7be-b4ca-4327-9c41-7e35ee2c41ae@x9g2000yqk.googlegroups.com>
	<68b98811-6352-4b84-952a-c5e0209e8bd3@x9g2000yqk.googlegroups.com>
Message-ID: <3e91a7f3-53b3-4454-91b6-d1bd00892010@s20g2000yqh.googlegroups.com>

On Feb 12, 9:31?am, redbaron <ivanov.ma... at gmail.com> wrote:
> > ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/
> > lib/python2.6/site-packages/cx_Oracle.so, 2): Symbol not found:
> > ___divdi3
>
> You didn't link cx_Oracle.so all libs which it use. run "ldd -r
> cx_Oracle.so" and you'll have an idea about all missing symbols. The
> names of missed symbols could give you an idea what else should
> cx_Oracle.so should be linked with

We are getting a "command not found" error for the ldd command in OS X
10.5.6

Please advise.


From james at agentultra.com  Thu Feb 12 14:25:46 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 12 Feb 2009 14:25:46 -0500
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <85fxijh2yt.fsf@agentultra.com>

azrael <jura.grozni at gmail.com> writes:

> To be honest, in compare to Visual Studio, Gui Builders for wx
> widgets are really bad.

That's because Visual Studio is a Microsoft product to build
interfaces for Microsoft products.

wx on the other hand is cross platform and ergo, much more
complicated.

> Do you know if there is any project curently running for GUI
> builders, maybe for WX, That I could maybe join.

You could help wx. Make your own gui builder if you think you could do
better. There's also GTK and Qt... and probably many others.


From krmane at gmail.com  Thu Feb 12 14:34:10 2009
From: krmane at gmail.com (Krishnakant)
Date: Fri, 13 Feb 2009 01:04:10 +0530
Subject: need help from some one who uses python-ooolib
Message-ID: <1234467250.10414.155.camel@kk-laptop>

hello all,
Has any one used python-ooolib to create open office spreadsheets?
I want to know the method of merging cells using the library's calc
class.
happy hacking.
Krishnakant.




From tjreedy at udel.edu  Thu Feb 12 14:34:21 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 14:34:21 -0500
Subject: Spam
In-Reply-To: <15b8ac796d4482926d373b153409383c.squirrel@localhost>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>	<49945B11.9030007@tim.thechases.com>
	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
Message-ID: <gn1tjp$2ah$1@ger.gmane.org>

andrew cooke wrote:
> A quick search on "imap nntp" turned up this list that might be useful -
> http://deflexion.com/messaging/ although I wonder when it was written
> because I remember using Aaron's RSS to email aggregator when RSS was
> new(!).
> 
> It mentions gmane, though, which certainly still exists (I assume it
> carries this list too).

Yes.  For everything possible, I read and post via gmane.  Gmane mirrors 
technical mailing lists.  As near as I can tell, posts via gmane go to 
the mailing list first, for whatever filtering the list does. 
Conversely then, gmane only posts the filtered output from the mailing list.

 >  And this page suggests you can read gmane via
> nntp - http://reticule.gmane.org/

news.gmane.org works fine.

> Aha!  yes!  It;s in the FAQ :o)
> 
>   Can I read news via secure NNTP (nntps)?
>   Yes. Point your news reader towards nntps://snews.gmane.org/.
> 
> http://www.gmane.org/faq.php



From sushiboy21 at gmail.com  Thu Feb 12 14:40:57 2009
From: sushiboy21 at gmail.com (S-boy)
Date: Thu, 12 Feb 2009 11:40:57 -0800 (PST)
Subject: Can't load smtplib
Message-ID: <027b7c9e-3e63-4246-99a4-212fe297a260@l1g2000yqj.googlegroups.com>

I can't seem to import smtplib in either a script or the command line
interpreter.

When I try to import smtp, there seems to be some kind of collision
with urllib2. I get a weird error about Web server authorization, even
though I'm not calling urllib2.

Any ideas on what might be causing this?

Here's the mess....

Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin

>>> import smtplib

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/smtplib.py", line 46, in <module>
    import email.Utils
  File "email.py", line 4, in <module>
    response = urlopen("https://webmail.canwest.com")
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 124, in urlopen
    return _opener.open(url, data)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 387, in open
    response = meth(req, response)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 498, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 425, in error
    return self._call_chain(*args)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 360, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/urllib2.py", line 506, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
authorization to fulfill the request. Access to the Web server is
denied. Contact the server administrator.  )


From stef.mientki at gmail.com  Thu Feb 12 14:41:17 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 12 Feb 2009 20:41:17 +0100
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <49947B5D.4000202@gmail.com>

azrael wrote:
> To be honest, in compare to Visual Studio, Gui Builders for wx widgets
> are really bad. Also completly for python there is not one good
> GuiBuilder. The only one I have seen that would come near VS was
> BoaConstructor, But the number of Bugs is just horrific. Too bad that
> no one is developing it further.
>
> Do you know if there is any project curently running for GUI builders,
> maybe for WX, That I could maybe join.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   
Well I come from Delphi, and compared to Delphi, even Visual Studio 
vanishes ;-)
I also tried to start with wxGlad, Boa, XRC ....
... but they were full of bugs, or even couldn't be started.
The best seems to be PyQt, but the license is (still) terrible (and 
maybe only their stories are much better than the real result ;-).
I didn't try XRC, because I found it much too difficult,
but instead I wrote a small program,
making a much easier version of the XRC-idea.
And after a few months,
I don't even notice the difference between Delphi (which I'm still using)
and wxPython.

I think this story happened to other people to,
so instead of putting a lot of effort in designing and maintaining a GUI 
builders,
it might be better to choose another solution.

btw, the idea I used, can be seen here]
http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
and the code can be found here
http://code.google.com/p/pylab-works/downloads/list

cheers,
Stef


From tjreedy at udel.edu  Thu Feb 12 14:42:46 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 14:42:46 -0500
Subject: Spam
In-Reply-To: <gn1tjp$2ah$1@ger.gmane.org>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>	<49945B11.9030007@tim.thechases.com>	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
	<gn1tjp$2ah$1@ger.gmane.org>
Message-ID: <gn1u3g$38f$1@ger.gmane.org>

Terry Reedy wrote:
> andrew cooke wrote:
>> A quick search on "imap nntp" turned up this list that might be useful -
>> http://deflexion.com/messaging/ although I wonder when it was written
>> because I remember using Aaron's RSS to email aggregator when RSS was
>> new(!).
>>
>> It mentions gmane, though, which certainly still exists (I assume it
>> carries this list too).
> 
> Yes.  For everything possible, I read and post via gmane.  Gmane mirrors 
> technical mailing lists.  As near as I can tell, posts via gmane go to 
> the mailing list first, for whatever filtering the list does. Conversely 
> then, gmane only posts the filtered output from the mailing list.
> 
>  >  And this page suggests you can read gmane via
>> nntp - http://reticule.gmane.org/
> 
> news.gmane.org works fine.
> 
>> Aha!  yes!  It;s in the FAQ :o)
>>
>>   Can I read news via secure NNTP (nntps)?
>>   Yes. Point your news reader towards nntps://snews.gmane.org/.
>>
>> http://www.gmane.org/faq.php

I just switched my Thunderbird gmane account to snews... and [x] use ssl 
and it seems to work ok.  It did, however, reset everything to unread.



From exarkun at divmod.com  Thu Feb 12 14:50:42 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 12 Feb 2009 14:50:42 -0500
Subject: Can't load smtplib
In-Reply-To: <027b7c9e-3e63-4246-99a4-212fe297a260@l1g2000yqj.googlegroups.com>
Message-ID: <20090212195042.12853.200194161.divmod.quotient.9312@henry.divmod.com>

On Thu, 12 Feb 2009 11:40:57 -0800 (PST), S-boy <sushiboy21 at gmail.com> wrote:
>I can't seem to import smtplib in either a script or the command line
>interpreter.
>
>When I try to import smtp, there seems to be some kind of collision
>with urllib2. I get a weird error about Web server authorization, even
>though I'm not calling urllib2.
>
>Any ideas on what might be causing this?
>
>Here's the mess....
>
>Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
>[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>
>>>> import smtplib
>
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/smtplib.py", line 46, in <module>
>    import email.Utils
>  File "email.py", line 4, in <module>

Ooops.  Here's your problem.  Notice how that's not /Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/email/?  You have an "email" module that's obscuring the stdlib
email package.

>    response = urlopen("https://webmail.canwest.com")
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 124, in urlopen
>    return _opener.open(url, data)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 387, in open
>    response = meth(req, response)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 498, in http_response
>    'http', request, response, code, msg, hdrs)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 425, in error
>    return self._call_chain(*args)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 360, in _call_chain
>    result = func(*args)
>  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
>python2.5/urllib2.py", line 506, in http_error_default
>    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
>urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
>authorization to fulfill the request. Access to the Web server is
>denied. Contact the server administrator.  )

Jean-Paul


From ptmcg at austin.rr.com  Thu Feb 12 14:56:40 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 12 Feb 2009 11:56:40 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<153b1a1e-e9eb-4e94-85bf-db019d0d1e55@x10g2000yqk.googlegroups.com> 
	<2d88e036-a529-4364-9fcb-e8fe7446827e@g38g2000yqd.googlegroups.com>
Message-ID: <1e02747f-3058-4e9b-b971-e2500da500d2@z1g2000yqn.googlegroups.com>

On Feb 12, 12:26?pm, maksym.ka... at gmail.com wrote:
>
> Well the output of
>
> > print(type(obj))
> > print(str(obj))
>
> was
>
> <class 'worldmap.GeoMap'>
> <worldmap.GeoMap object at 0x01DD17B0>
>
> Just looks well, isn't it? i have no idea what's wrong

So then how do you know isinstance is evaluating to False?  And why do
you return None if it evals to True?  Can you drop a print command
inside the if block just before returning None, and another print just
before returning the default default?

I also would recommend using a debugger like winpdb when in a spot
like this - despite the name, it is not Windows-only, and you can step
through this code and evaluate variables and expressions inline.

-- Paul


From deets at nospam.web.de  Thu Feb 12 14:56:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 20:56:43 +0100
Subject: something wrong with isinstance
In-Reply-To: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <6vjd7rFjdhqrU1@mid.uni-berlin.de>

maksym.kaban at gmail.com schrieb:
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
> 
> i have an object of class GeoMap which contains lists with objects of
> GeoMapCell (i will not explain what they should do, hope its not
> important). Then i want to serialize these objects to json notation.
> So i imported json module and as shown in docs for it extended
> JSONEncoder class.  Look at the code below
> 
> ##main module
> from worldmap import GeoMap, GeoMapCell
> 
> import testdata
> import json
> 
> class GeoMapEncoder(json.JSONEncoder):
>     def default(self, obj):
>         if isinstance(obj, GeoMap):
>             return None
>         return json.JSONEncoder.default(self, obj)
> 
> def main():
>     print(json.dumps(2 + 5j, cls=ComplexEncoder))
> 
>     geomap = testdata.createTestMap()
>     print(json.dumps(geomap, cls=GeoMapEncoder))
>     pass
> 
> if __name__ == '__main__':
>     main()
> 
> ===========
> 
> ##worldmap module
> class GeoMap:
>     cells = []
>     activerow = 0
>     activecol = 0
> 
>     def addCell(self, acell):
>         if len(self.cells) == 0:
>           self.cells.append([])
>           self.activerow = 0
>         acell.col = self.activerow
>         acell.row = self.activecol
>         self.cells[self.activerow].append(acell)
>         self.activecol += 1
> 
>     def addRow(self):
>         self.cells.append([])
>         self.activerow += 1;
>         self.activecol = 0;
> 
> class GeoMapCell:
>     neighbours = (None, None, None, None, None, None, )
>     col = 0
>     row = 0
> 
> The problem is in here.
> 
> class GeoMapEncoder(json.JSONEncoder):
>     def default(self, obj):
>         if isinstance(obj, GeoMap):  ## <=======   isinstance doesnot
> work as i expected
>             return None
>         return json.JSONEncoder.default(self, obj)
> 
>  Though obj is object of GeoMap class, isinstance returns False. Where
> was i mistaken. If i shouldn't use isinstance, then what function
> would check class of object?
> 
> Oh, maybe its important. I'm working on WinXP SP3, Python 3.0, IDE -
> PyScript


I think you have a common problem here that occurs when using a script 
with more that non-trivial contents as main-script.


What happens is this: you have a

__main__.GeoMap, which is the one tested against in isinstance.

*And* you have a <mainmodule>.GeoMap (replace <mainmodule> with the 
actual name) that is imported & used from the other module.


A simple testscript illustrates the issue:


### test.py ####

class Foo(object):
     pass


if __name__ == "__main__":
    import test
    print Foo == test.Foo


Run it from inside the directory you saved it in.

To work around this issue, simply create a bootstrap-main-module that 
has not much in it.

Diez


From deets at nospam.web.de  Thu Feb 12 14:58:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 12 Feb 2009 20:58:28 +0100
Subject: Capture images in macOS X
In-Reply-To: <mailman.9423.1234463605.3487.python-list@python.org>
References: <mailman.9423.1234463605.3487.python-list@python.org>
Message-ID: <6vjdb4FjdhqrU2@mid.uni-berlin.de>

Jonathan Chac?n schrieb:
> Hello,
> 
> I need to capture images from the macbook webcam in leopard.
> Does anybody know how can I do this?

Use the pyobjc bridge & some ObjectiveC-framework such as 
CocoaSequenceGrabber.

http://www.skyfell.org/cocoasequencegrabber.html

There are similar ones out there.

Diez


From vincent at vincentdavis.net  Thu Feb 12 15:01:32 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Thu, 12 Feb 2009 13:01:32 -0700
Subject: Spam
In-Reply-To: <gn1u3g$38f$1@ger.gmane.org>
References: <467e1f02-47ba-4bd2-ad40-853e3886ff60@40g2000prx.googlegroups.com>
	<7a9c25c20902120909r3ae5e67cx682603e33c9b3863@mail.gmail.com>
	<49945B11.9030007@tim.thechases.com>
	<15b8ac796d4482926d373b153409383c.squirrel@localhost>
	<gn1tjp$2ah$1@ger.gmane.org> <gn1u3g$38f$1@ger.gmane.org>
Message-ID: <77e831100902121201v5820dac8p4f9399fa68a0d332@mail.gmail.com>

I am a little disturbed that there are no moderators,
mostly because I received an email back from the list"Your mail to
'Python-list' with the subject. Above and beyond, critique request. Is being
held until the list moderator can review it for approval. The reason it is
being held: Message body is too big: 41670 bytes with a limit of 40
KB. Either the message will get posted to the list, or you will receive
notification of the moderator's decision.  If you would like to cancel
this posting, please visit the following URL:"

So does this mean it will never actually be reviewed?

Thanks
Vincent Davis



On Thu, Feb 12, 2009 at 12:42 PM, Terry Reedy <tjreedy at udel.edu> wrote:

> Terry Reedy wrote:
>
>> andrew cooke wrote:
>>
>>> A quick search on "imap nntp" turned up this list that might be useful -
>>> http://deflexion.com/messaging/ although I wonder when it was written
>>> because I remember using Aaron's RSS to email aggregator when RSS was
>>> new(!).
>>>
>>> It mentions gmane, though, which certainly still exists (I assume it
>>> carries this list too).
>>>
>>
>> Yes.  For everything possible, I read and post via gmane.  Gmane mirrors
>> technical mailing lists.  As near as I can tell, posts via gmane go to the
>> mailing list first, for whatever filtering the list does. Conversely then,
>> gmane only posts the filtered output from the mailing list.
>>
>>  >  And this page suggests you can read gmane via
>>
>>> nntp - http://reticule.gmane.org/
>>>
>>
>> news.gmane.org works fine.
>>
>>  Aha!  yes!  It;s in the FAQ :o)
>>>
>>>  Can I read news via secure NNTP (nntps)?
>>>  Yes. Point your news reader towards nntps://snews.gmane.org/.
>>>
>>> http://www.gmane.org/faq.php
>>>
>>
> I just switched my Thunderbird gmane account to snews... and [x] use ssl
> and it seems to work ok.  It did, however, reset everything to unread.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From jura.grozni at gmail.com  Thu Feb 12 15:04:55 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:04:55 -0800 (PST)
Subject: A little bit else I would like to discuss
Message-ID: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>

Sometimes I really get confused when looking out for a modul for some
kind of need. Sometimes I get frightened when I get the resaults. 8
wraper for this, 7 wrapers for that, 10 modules for anything. Between
them are maybe some kind of small differences, but to work with any of
the modules, I have to spend 10 hours of reading the help, If there is
any at all.

I think that there should be a list on python.org of supported or
sugested modules for some need. For example Database access. Or GUI
Building. It is a complete pain in the ass. Let's face the true, TK is
out of date. There should be another one used and appended to the
standard Python Library. One that plays well with other platforms. And
if it does't, let's make it play better.

Why will Microsoft's products kick the ass of open source. Because
anyone does what he wants. Let's say There are 5 GUI libraries
competing against each other. Think about it what could these 5 teams
acomplish if they would work together. Or maybe a framework for RAD
GUI devbelopment. after 10 years of python, there is still not one
application for GUI Building that can beat Visual Studio.

Anyone I talk to says: "Oh my god, Python and GUI"

There are a dozen of modules that should be, if you ask me, be
implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
talk to, are using them. But everyone has to download them manually
and hope that if someone is using their code, has also installed the
needed modules.



My solution would be:
Let's make an announcement on Python.org. something like this.

We need Ideas for creating the a standard library in Python for Image
processing. Tell  us your problem. What do you think which feature
should be implemented. Which transformation, which algorithm.
Make a vote. This should be that not.

But how to start something like that. Anyone that sees a problem that
should be solved, becomes the project leader. Find the best Ideas and
make a good library.


It's is very good that people have a choice. But why not make some
standards. I know that there is already a standard python library, But
why not extending it. classify the standard library into subcategories
like Networking, DataBase, Computation, ......



One other thing. I am not looking for war on groups. I just would like
to discuss some things that drive me crazy while using Python.

This group has a lot of members. not to mention every Python Forum.
Why not using this number of people and accomplish something great. If
anyone of us would write 10 line of good code, it would result a very
great and powerfull environment.


From jura.grozni at gmail.com  Thu Feb 12 15:11:41 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:11:41 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
Message-ID: <4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>

On Feb 12, 8:25?pm, J Kenneth King <ja... at agentultra.com> wrote:
> azrael <jura.gro... at gmail.com> writes:
> > To be honest, in compare to Visual Studio, Gui Builders for wx
> > widgets are really bad.
>
> That's because Visual Studio is a Microsoft product to build
> interfaces for Microsoft products.
>
> wx on the other hand is cross platform and ergo, much more
> complicated.
>

I think that WX is really great but there is really a great lack of a
builder.





> > Do you know if there is any project curently running for GUI
> > builders, maybe for WX, That I could maybe join.
>
> You could help wx. Make your own gui builder if you think you could do
> better. There's also GTK and Qt... and probably many others.





I think that this would be a great mistake. Let's sit down and make my
own gui builder. I think That some people should sit together and
discuss what we need to make a good GUI builder. I am in. Who would
like to join me.


From philip at semanchuk.com  Thu Feb 12 15:15:12 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 12 Feb 2009 15:15:12 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>


On Feb 12, 2009, at 3:04 PM, azrael wrote:

> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.

Let me know when Visual Studio tries to address building GUIs for  
Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to  
oranges, or chalk and cheese if you're from that part of the world.





From jura.grozni at gmail.com  Thu Feb 12 15:18:38 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 12:18:38 -0800 (PST)
Subject: A little bit else I would like to discuss
Message-ID: <98e33cd6-aa9d-4626-9f07-20fe5984bfbb@j38g2000yqa.googlegroups.com>

Sometimes I really get confused when looking out for a modul for some
kind of need. Sometimes I get frightened when I get the resaults. 8
wraper for this, 7 wrapers for that, 10 modules for anything. Between
them are maybe some kind of small differences, but to work with any of
the modules, I have to spend 10 hours of reading the help, If there is
any at all.

I think that there should be a list on python.org of supported or
sugested modules for some need. For example Database access. Or GUI
Building. It is a complete pain in the ass. Let's face the true, TK is
out of date. There should be another one used and appended to the
standard Python Library. One that plays well with other platforms. And
if it does't, let's make it play better.

Why will Microsoft's products kick the ass of open source. Because
anyone does what he wants. Let's say There are 5 GUI libraries
competing against each other. Think about it what could these 5 teams
acomplish if they would work together. Or maybe a framework for RAD
GUI devbelopment. after 10 years of python, there is still not one
application for GUI Building that can beat Visual Studio.

Anyone I talk to says: "Oh my god, Python and GUI"

There are a dozen of modules that should be, if you ask me, be
implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
talk to, are using them. But everyone has to download them manually
and hope that if someone is using their code, has also installed the
needed modules.



My solution would be:
Let's make an announcement on Python.org. something like this.

We need Ideas for creating the a standard library in Python for Image
processing. Tell  us your problem. What do you think which feature
should be implemented. Which transformation, which algorithm.
Make a vote. This should be that not.

But how to start something like that. Anyone that sees a problem that
should be solved, becomes the project leader. Find the best Ideas and
make a good library.


It's is very good that people have a choice. But why not make some
standards. I know that there is already a standard python library, But
why not extending it. classify the standard library into subcategories
like Networking, DataBase, Computation, ......



One other thing. I am not looking for war on groups. I just would like
to discuss some things that drive me crazy while using Python.

This group has a lot of members. not to mention every Python Forum.
Why not using this number of people and accomplish something great. If
anyone of us would write 10 line of good code, it would result a very
great and powerfull environment.


From gervaz at gmail.com  Thu Feb 12 15:20:39 2009
From: gervaz at gmail.com (mattia)
Date: 12 Feb 2009 20:20:39 GMT
Subject: Library similar to UserAgent (perl)
References: <49933ca6$0$1125$4fafbaef@reader1.news.tin.it>
	<6vik2dFk1ph9U1@mid.uni-berlin.de>
Message-ID: <49948497$0$1123$4fafbaef@reader2.news.tin.it>

Il Thu, 12 Feb 2009 13:47:09 +0100, Diez B. Roggisch ha scritto:

> mattia wrote:
> 
>> Hi everybody, I'm looking for an easy way to put data in a form, then
>> click the button and follow the redirect. Also I need to use cookies. I
>> read that using perl this can be done using the UserAgent lib, that
>> also provide th browser functionality to let the site believe that you
>> are getting the pages from a normali browser like ff. Any suggestion? I
>> think that the main concen is to easilly put the data in the numerous
>> textlabel provided and then magically simulate the 'click me' button.
> 
> Python mechanize.
> 
> Diez

Thanks a lot.

Mattia


From steve at holdenweb.com  Thu Feb 12 15:22:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 12 Feb 2009 15:22:28 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<mailman.9352.1234385290.3487.python-list@python.org>
	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
Message-ID: <gn20f7$d0e$1@ger.gmane.org>

John Machin wrote:
> On Feb 12, 7:48 am, Stef Mientki <stef.mien... at gmail.com> wrote:
>> Alec Schueler wrote:
>>> On Feb 11, 7:58 pm, Stef Mientki <stef.mien... at gmail.com> wrote:
>>>> As there are a whole lot of these lines, in a whole lot of files,
>>>> I wonder if there's a simple trick to point
>>>>   /usr/share/tinybldLin/
>>>> to my directory ?
>>>> thanks,
>>>> Stef
>>> Find and replace?
>> well I was thinking of a more elegant way,
>> so the scripts remains, or better become multi-platform.
> 
> Your current setup is not even single-platform portable ... consider
> the scenario where some Linux admin wants your gear to live in some
> directory other than /usr/share/tinybldLin/
> 
> The standard technique for ensuring that kind of portability involves:
> 1. Find the directory in which your script lives. Inspect sys.argv[0],
> use some os.path.some_functionality() to extract the directory, name
> it (say) home_base.
> 2. When you want to open a data file in the script's directory, do
> this:
>    the_path = os.path.join(home_base, 'stef1.dat')
>    f = open(the_path, .....)
> 
> NOTE: Use os.path.join() instead of some DIY technique; it knows
> better than you what the path separator is on the OS it's being run
> on. In fact, read the whole of the os.path manual carefully before you
> jump in to changing your code.
> 
> If you prefer to have the data files in (say) .../script_locn/data
> instead of .../script_locn, the adjustment should be obvious.
> 
> Unfortunately, you are still going to need use find and replace to fix
> your script. Code in haste, repent at leisure :-)
> 
Of course the real issue here is that the same hard-coded directory name
(or possibly multiple directory names all rooted in the same directory)
are scattered throughout the program. Your (the OP's) first task should
be to store that "root" directory in a variable and then use the
variable in place of all current uses of the root directory.

For example, I have a Django project that I like to run under both
Windows and Cygwin. So in my settings.py file I have:

# Django settings for PyTeach project.
import sys
if sys.platform == 'cygwin':
    fsroot = "/home/sholden"
elif sys.platform  == 'win32':
    fsroot = "C:/Users/sholden/Documents"
else:
    sys.exit("Only configured for Windows and Cygwin")

Than further down I have

# Absolute path to the directory that holds media.
# Example: "/home/media/media.lawrence.com/"
MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'

Note that most Windows APIs allow you to use the forward slash as a
delimiter. It's mostly the command line and Windows Explorer that are
snotty about insisting on the backslash.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mail at timgolden.me.uk  Thu Feb 12 15:24:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 12 Feb 2009 20:24:33 +0000
Subject: A little bit else I would like to discuss
In-Reply-To: <B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
Message-ID: <49948581.6070001@timgolden.me.uk>

Philip Semanchuk wrote:
> 
> On Feb 12, 2009, at 3:04 PM, azrael wrote:
> 
>> Why will Microsoft's products kick the ass of open source. Because
>> anyone does what he wants. Let's say There are 5 GUI libraries
>> competing against each other. Think about it what could these 5 teams
>> acomplish if they would work together. Or maybe a framework for RAD
>> GUI devbelopment. after 10 years of python, there is still not one
>> application for GUI Building that can beat Visual Studio.
> 
> Let me know when Visual Studio tries to address building GUIs for 
> Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to 
> oranges, or chalk and cheese if you're from that part of the world.

While your point is obviously good, it only applies if you
even care about building for OS X, Gnome etc. If all you
want is build on Windows (or Gnome or KDE or whatever) then
the cross-platformness of any proposed toolkit is worthless
and may even be a drawback if it reduces its functionality
to a lowest common denominator.

I have nothing really to say about GUI-building whatsits in
general; I don't have cause to use them myself so I simply
stand back and let their proponents fight it out. I just
wanted to point out that playing the cross-platform card
does not mean the game is over.

TJG


From lists at cheimes.de  Thu Feb 12 15:40:24 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 21:40:24 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <gn21fo$gnh$1@ger.gmane.org>

azrael wrote:
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

The Python core will not ship with another GUI toolkit. TK may be
removed from the core in some distant future but we - the Python core
development team - will *not* make a choice between GTK, WX and Qt.


> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.

In your opinion all third party are bad. You like to have one monolithic
block of software. That's a typical Microsoft approach. Lot's of people
from the open source community prefer small and loosely coupled pieces
of software. One of the greatest ruler of all time once said "divide et
impera" -- divide it in small pieces to make it much easier to conquer
every piece by its own. We are following the same path here.

Nobody is going to stop you from creating a large bundle of useful
extensions as long as you follow the licenses. In fact lots of people
may appreciate a bundle. But the Python core package will always stay
small and agile.

Christian



From lists at cheimes.de  Thu Feb 12 15:42:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 21:42:14 +0100
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
Message-ID: <gn21j6$gfk$1@ger.gmane.org>

azrael wrote:
> On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
>> azrael <jura.gro... at gmail.com> writes:
>>> To be honest, in compare to Visual Studio, Gui Builders for wx
>>> widgets are really bad.
>> That's because Visual Studio is a Microsoft product to build
>> interfaces for Microsoft products.
>>
>> wx on the other hand is cross platform and ergo, much more
>> complicated.
>>
> 
> I think that WX is really great but there is really a great lack of a
> builder.

This isn't a Python problem - really. Please discuss your issues with
the WX Gui builder on a WX list. We can't do anything about it.

Christian




From gc_ottawa at yahoo.ca  Thu Feb 12 15:53:13 2009
From: gc_ottawa at yahoo.ca (gc_ottawa at yahoo.ca)
Date: Thu, 12 Feb 2009 12:53:13 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<mailman.9428.1234467669.3487.python-list@python.org>
Message-ID: <aedfee1e-d7e2-41fc-88d4-1cf3fd8484cd@h16g2000yqj.googlegroups.com>

......I come from Delphi, and compared to Delphi, even Visual Studio
> vanishes ;-)
...........I don't even notice the difference between Delphi (which
I'm still using)
> and wxPython.
>
> I think this story happened to other people to,
> so instead of putting a lot of effort in designing and maintaining a GUI
> builders,
> it might be better to choose another solution.
>
> btw, the idea I used, can be seen here]http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
> and the code can be found herehttp://code.google.com/p/pylab-works/downloads/list
>
> cheers,
> Stef

You know, 10 or more years ago both Borland and Microsoft got it right
when they incorporated a GUI with an IDE in their Delphi and Visual
Basic products. As wonderful as the Python language is, it is very
much a work in progress when compared to the ease of use of the
aforementioned products. These products revolutionized the industry
with their "Rapid Applications Development" (RAD).

Python reminds me of a toolbox filled with a multitude of single use
tools when all you need is a Skilsaw and a combination screwdriver.
Gord


From joshua at joshuakugler.com  Thu Feb 12 16:22:15 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Thu, 12 Feb 2009 12:22:15 -0900
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com>
Message-ID: <gn23u8$q09$1@ger.gmane.org>

Bob Kline wrote:

> [Didn't realize the mirror didn't work both ways]
> 
> We just upgraded Python to 2.6 on some of our servers and a number of our
> CGI scripts broke because the cgi module has changed the way it handles
> POST requests.

> When the 'action' attribute was not present in the form 
> element on an HTML page the module behaved as if the value of the
> attribute was the URL which brought the user to the page with the form,
> but without the query (?x=y...) part.

This does not make sense.  Can you give an example?  When you POST, the
attributes are not appended to the URL, but form encoded.

> Now FieldStorage.getvalue () is 
> giving the script a list of two copies of the value for some of the
> parameters (folding in the parameters from the previous request) instead
> of the single string it used to return for each.

There is a function call to get only one value.  I think it's get_first() or
some such.

Well, the CGI module hasn't had many changes.  There was this bug fix a few
months back:

http://svn.python.org/view?rev=64447&view=rev

Diff to previous:
http://svn.python.org/view/python/trunk/Lib/cgi.py?rev=64447&r1=58218&r2=64447

For all revisions:
http://svn.python.org/view/python/trunk/Lib/cgi.py?rev=67528&view=log

It is possible that by fixing a bug, they brought the behavior in line with
what it *should* be.  Or maybe the browser behavior changed?  The server
does not care about an "action" attribute.  That only tells the browser
where to send the data.  It is possible the browser did not properly format
a request when there was no "action" attribute. Can you provide more
details?

j



From argo785 at gmail.com  Thu Feb 12 16:23:54 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Thu, 12 Feb 2009 13:23:54 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<op.uo8fbuazwepdt4@ericb.pragmadev>
Message-ID: <65f014fd-2013-48ec-9f2e-ae0527714e24@p13g2000yqc.googlegroups.com>

On Feb 12, 4:29?am, "Eric Brunel" <see.signat... at no.spam> wrote:
> On Thu, 12 Feb 2009 06:06:06 +0100, <argo... at gmail.com> wrote:
>
> [snip]
>
> > My only (minor) complaint is that Tk
> > doesn't draw text antialiased in the various widgets (menus, labels,
> > buttons, etc.).
>
> ?From version 8.5 of tcl/tk, it's supposed to do it. See this page:http://www.tcl.tk/software/tcltk/8.5.tml
> under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only ?
> about X11 and Mac OS X; don't know if it works on Windows...

Looking forward to it. Searching around some more, also found this:

http://tkinter.unpythonic.net/wiki/Tk85AndPython

which sheds a little light.

And following a link therein, it would seem that we'll have it by
default with Python 2.7/3.1 -- [this bug](http://bugs.python.org/
issue2983) was closed about 2 weeks ago.


From hamish at valvesoftware.com  Thu Feb 12 16:26:26 2009
From: hamish at valvesoftware.com (Hamish McKenzie)
Date: Thu, 12 Feb 2009 13:26:26 -0800
Subject: getting caller
Message-ID: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>

so I'm trying to wrap some functionality around execfile but don't want to modify the way it works.  specifically when you call execfile, it automatically grabs globals and locals from the frame the execfile exists in.

so if I wrap execfile in a function, I need a way to reliably get at the calling frame.

what I want to know is - is it *ALWAYS* true that:
inspect.getouterframes( inspect.currentframe() )[ 1 ][ 0 ]

will return me the frame that called execfile in the first place?

I can't think of a way that this wouldn't be the case, but I'm not 100% sure that assertion is valid.
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From martin at marcher.name  Thu Feb 12 16:36:20 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:36:20 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <gn21fo$gnh$1@ger.gmane.org>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
Message-ID: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>

Hi,

at first I wanted to file this under meta-discussions, but your lost
paragraph got me thinking...

2009/2/12 Christian Heimes <lists at cheimes.de>:
> Nobody is going to stop you from creating a large bundle of useful
> extensions as long as you follow the licenses. In fact lots of people
> may appreciate a bundle. But the Python core package will always stay
> small and agile.

How does "small and agile" work with "batteries included"?

>From my point of view:

agile::
 Would describe faster extension of the standard lib (rrd, yaml should
IMHO already be in the standard lib). I'm pretty sure other people
want to see other modules, but that's what agile + standard lib would
mean for me. (Also I'm sometimes confused by the naming of modules but
that's a different story)

small::
 just the opposite of "batteries included"

My absolute favorite would be

 * python as just python (no standard lib)
 * a (rather) fast moving standard lib available as an addon download
  * possibly for each version

I guess that would mean *a lot* maintenance overhead so that will
probably never.

Finally: Ignore me, Python is still the language that let's me get
stuff done in the fastest and most enjoyable way. Thanks to GvR for
the initial idea and all the volounteers for making it even better :)


-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From martin at marcher.name  Thu Feb 12 16:36:51 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:36:51 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
Message-ID: <5fa6c12e0902121336j7168bfe6ofeeb194f5851e17b@mail.gmail.com>

Oh yeah and ignore my typos also :)

2009/2/12 Martin <martin at marcher.name>:
> Hi,
>
> at first I wanted to file this under meta-discussions, but your lost
> paragraph got me thinking...
>
> 2009/2/12 Christian Heimes <lists at cheimes.de>:
>> Nobody is going to stop you from creating a large bundle of useful
>> extensions as long as you follow the licenses. In fact lots of people
>> may appreciate a bundle. But the Python core package will always stay
>> small and agile.
>
> How does "small and agile" work with "batteries included"?
>
> From my point of view:
>
> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). I'm pretty sure other people
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)
>
> small::
>  just the opposite of "batteries included"
>
> My absolute favorite would be
>
>  * python as just python (no standard lib)
>  * a (rather) fast moving standard lib available as an addon download
>  * possibly for each version
>
> I guess that would mean *a lot* maintenance overhead so that will
> probably never.
>
> Finally: Ignore me, Python is still the language that let's me get
> stuff done in the fastest and most enjoyable way. Thanks to GvR for
> the initial idea and all the volounteers for making it even better :)
>
>
> --
> http://soup.alt.delete.co.at
> http://www.xing.com/profile/Martin_Marcher
> http://www.linkedin.com/in/martinmarcher
>
> You are not free to read this message,
> by doing so, you have violated my licence
> and are required to urinate publicly. Thank you.
>
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>



-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From Scott.Daniels at Acm.Org  Thu Feb 12 16:40:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 12 Feb 2009 13:40:33 -0800
Subject: Help: makefile in Windows
In-Reply-To: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>
References: <14f4ef16-0af6-4bdd-b195-a768e63aaf7a@j35g2000yqh.googlegroups.com>
Message-ID: <1LydnXXXgdpNCwnUnZ2dnUVZ_sjinZ2d@pdx.net>

Muddy Coder wrote:
> Hi Folks,
> 
> I am learning Extending Python, by testing the demo script of
> Programming Python. In the book, a makefile for Linux is there, but I
> am using Windows currently. I wish somebody would help me to get a
> makefile for Windows, my makefile.linux is as below:

Use distutils, and write a setup.py.  You will want to use mingw32.
Searching for "building python25 C extensions mingw32" should point you
right.

--Scott David Daniels
Scott.Daniels at Acm.Org


From martin at marcher.name  Thu Feb 12 16:42:30 2009
From: martin at marcher.name (Martin)
Date: Thu, 12 Feb 2009 22:42:30 +0100
Subject: how many databases exists?
In-Reply-To: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>
References: <4260DCD6-B6D4-4372-A658-C880DAACAF7E@mimectl>
Message-ID: <5fa6c12e0902121342h1667f3d2p59603c86b3fcd2cc@mail.gmail.com>

Hi,

you want to check the postgres documentation for that :)

2009/2/12 Rosell Pupo Polanco <rpolanco at estudiantes.uci.cu>:
> hello, i am working in pythoncard and i need to know how many databases
> exist in my server POstgresql, exists some funcion in python that can help
> me??

http://www.postgresql.org/docs/current/static/catalog-pg-database.html

hth
Martin

-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From cameron.pulsford at gmail.com  Thu Feb 12 16:57:19 2009
From: cameron.pulsford at gmail.com (dlocpuwons)
Date: Thu, 12 Feb 2009 13:57:19 -0800 (PST)
Subject: Problem with objects copying each other in memory
Message-ID: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>

Using Python 2.6.1...

I am (attempting) to make an A* search for a chess problem, but I am
running into a really annoying shared memory issue in my successor
function. Here it is stripped down to the important parts that relate
to my problem.

def successors(self):
		result = []
		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
2], [-1, -2]] #possible moves for a knight

		for i in moves:
			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
			temp.x += i[0]
			temp.y += i[1]
			temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
visited states list
			result.append(temp)
		return result

The method creates a temporary Knight object, increments it to the new
position and then adds this new position to its list of visited
states. Then it returns a list of these 8 new objects. The problem
seems to be with the "result.sl.append()" line. As the method chugs
along and creates the new objects the "temp.sl" lines seems to stay in
memory, so when the method is done all the new objects have all the
new states that were made over the course of the method instead of
just their own created in the loop. For example when I try to get
successors for a piece that is initially at (2,2) with no previously
visited states, the method prints this out for the sl (state list)
value

[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]
[[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
0]]

but what it should print out is

[[2, 2], [4, 3]]
[[2, 2], [4, 1]]
[[2, 2], [0, 3]]
[[2, 2], [0, 1]]
[[2, 2], [3, 4]]
[[2, 2], [3, 0]]
[[2, 2], [1, 4]]
[[2, 2], [1, 0]]

It sort of seems like python is trying to be too smart and is trying
to keep things in memory. Is there anyway to work around this?


From meshko at gmail.com  Thu Feb 12 17:02:29 2009
From: meshko at gmail.com (mk)
Date: Thu, 12 Feb 2009 14:02:29 -0800 (PST)
Subject: SOAP client
References: <c1f51257-dbf2-47ba-8221-03e8ea11ae47@j38g2000yqa.googlegroups.com>
	<9670bb81-a879-43cc-8abf-040e7b18c59d@q9g2000yqc.googlegroups.com>
Message-ID: <e68dedca-01c9-44dc-b6ef-5be909c89103@o11g2000yql.googlegroups.com>

On Feb 11, 11:20?am, Robin <robi... at gmail.com> wrote:
> On Feb 11, 3:33?pm, mk <mes... at gmail.com> wrote:
>
> > Hi,
>
> > I'm trying to consume aSOAPweb service using Python. ?So far I have
> > found two libraries: SOAPpy and ZSI. ?Both of them rely on PyXML which
> > is no longer maintained (and there is no build for 64bit Windows and
> > the setup.py doesn't seem to know how to build it on Windows). ?Is
> > there a liveSOAPlibrary for Python? ?I'm sort of surprised that a
> > common standard likeSOAPis not more actively supported in Python.
> > I'm probably missing something?
>
> > Thanks,
> > m
>
> For consuming services, I've found suds to be the best client:https://fedorahosted.org/suds/
>
> For creating them, I've been using soaplib:http://trac.optio.webfactional.com/
>
> HTH,
>
> Robin

Yes, thank you, Suds worked for me.
Kind of weird how it is not in the google results for obvious searches.


From shreyas22 at gmail.com  Thu Feb 12 17:03:53 2009
From: shreyas22 at gmail.com (shreyas shah)
Date: Thu, 12 Feb 2009 17:03:53 -0500
Subject: Regarding Joystick
In-Reply-To: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
Message-ID: <aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>

Hi ,

I am trying to control the motion of the camera with help of joystick , i
need some basic functionality where if i move a joystick to left the camera
moves to the left . Can anyone help me with that ?

Thanks
Shreyas
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From sushiboy21 at gmail.com  Thu Feb 12 17:04:14 2009
From: sushiboy21 at gmail.com (S-boy)
Date: Thu, 12 Feb 2009 14:04:14 -0800 (PST)
Subject: Can't load smtplib
References: <mailman.9430.1234468246.3487.python-list@python.org>
Message-ID: <6f04dfdc-929f-4584-8319-9ad696901863@b16g2000yqb.googlegroups.com>

Thanks. Turns out I had a script I wrote called email.py in my Python
path that was screwing things up.

On Feb 12, 2:50 pm, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 12 Feb 2009 11:40:57 -0800 (PST), S-boy <sushibo... at gmail.com> wrote:
> >I can't seem to import smtplib in either a script or the command line
> >interpreter.
>
> >When I try to import smtp, there seems to be some kind of collision
> >with urllib2. I get a weird error about Web server authorization, even
> >though I'm not calling urllib2.
>
> >Any ideas on what might be causing this?
>
> >Here's the mess....
>
> >Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> >[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>
> >>>> import smtplib
>
> >Traceback (most recent call last):
> >  File "<stdin>", line 1, in <module>
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/smtplib.py", line 46, in <module>
> >    import email.Utils
> >  File "email.py", line 4, in <module>
>
> Ooops.  Here's your problem.  Notice how that's not /Library/Frameworks/Python.framework/Versions/2.5/lib/>python2.5/email/?  You have an "email" module that's obscuring the stdlib
>
> email package.
>
>
>
> >    response = urlopen("https://webmail.canwest.com")
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 124, in urlopen
> >    return _opener.open(url, data)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 387, in open
> >    response = meth(req, response)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 498, in http_response
> >    'http', request, response, code, msg, hdrs)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 425, in error
> >    return self._call_chain(*args)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 360, in _call_chain
> >    result = func(*args)
> >  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
> >python2.5/urllib2.py", line 506, in http_error_default
> >    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
> >urllib2.HTTPError: HTTP Error 401: Unauthorized ( The server requires
> >authorization to fulfill the request. Access to the Web server is
> >denied. Contact the server administrator.  )
>
> Jean-Paul



From lists at cheimes.de  Thu Feb 12 17:08:05 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 12 Feb 2009 23:08:05 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
Message-ID: <gn26k5$3ak$1@ger.gmane.org>

Martin wrote:
[typos igored as requested ;)]

> How does "small and agile" work with "batteries included"?

The Python slogan says "batteries included", not "fusion reactor included".

> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). I'm pretty sure other people
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)
> 
> small::
>  just the opposite of "batteries included"

We have very high standard for the inclusion of new packages to the
stdlib. For lot's of packages it makes no sense to add them to the
stdlib for one or more reason.

The rules are:

 * only mature, well tested, widely used software which is useful
   for a broad audience.
 * PSF License 2.0
 * follows rules for Python and C code
 * The extension must work cross platform as far as all platforms
   support it. Only Python and C89 compatible code, no C++
 * software must be supported for a long time, about 5 to 10 years
   is a minimum.
 * no new features during a release cycle of a minor version
   (about 2 to years)
 * incompatible changes and API changes need at least one minor release
   of deprecation warnings.

It takes at least 1.5 years to get a new feature into an extension and
at least 3 years to remove or change a feature. That's a major shop
stopper for every fast moving piece of Python software.

> My absolute favorite would be
> 
>  * python as just python (no standard lib)
>  * a (rather) fast moving standard lib available as an addon download
>   * possibly for each version
> 
> I guess that would mean *a lot* maintenance overhead so that will
> probably never.

We considered to remove optional software from the core like the email
package, TCL/TK and more. Eventually we decided against it for various
reasons. For one we don't have the resources to maintain additional
packages.

Christian



From clp2 at rebertia.com  Thu Feb 12 17:10:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 12 Feb 2009 14:10:29 -0800
Subject: Problem with objects copying each other in memory
In-Reply-To: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902121410u50df6c7cy342ec1f6a00cd545@mail.gmail.com>

On Thu, Feb 12, 2009 at 1:57 PM, dlocpuwons <cameron.pulsford at gmail.com> wrote:
> Using Python 2.6.1...
>
> I am (attempting) to make an A* search for a chess problem, but I am
> running into a really annoying shared memory issue in my successor
> function. Here it is stripped down to the important parts that relate
> to my problem.
>
> def successors(self):
>                result = []
>                moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
> 2], [-1, -2]] #possible moves for a knight
>
>                for i in moves:
>                        temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>                        temp.x += i[0]
>                        temp.y += i[1]
>                        temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
> visited states list
>                        result.append(temp)
>                return result
>
> The method creates a temporary Knight object, increments it to the new
> position and then adds this new position to its list of visited
> states. Then it returns a list of these 8 new objects. The problem
> seems to be with the "result.sl.append()" line. As the method chugs
> along and creates the new objects the "temp.sl" lines seems to stay in
> memory, so when the method is done all the new objects have all the
> new states that were made over the course of the method instead of
> just their own created in the loop. For example when I try to get
> successors for a piece that is initially at (2,2) with no previously
> visited states, the method prints this out for the sl (state list)
> value

Just a guess based on the behavior you described, but do you by chance
have the Knight class defined as something like this?:

class Knight(whatever):
    sl = []

If so, that is not the proper way to create an instance variable in
Python. You've instead created a class variable, which is shared by
all instances of the class.

class Knight(whatever):
    def __init__(self, some, args, here):
        self.sl = []

If not, do you by chance define Knight as:

class Knight(whatever):
    def __init__(self, some, args, here, sl=[]):
        self.sl = sl

If so, you've fallen victim to the Important Warning on
http://docs.python.org/tutorial/controlflow.html#default-argument-values
under "Default Argument Values". The correct way to code it is:

class Knight(whatever):
    def __init__(self, some, args, here, sl=None):
        if sl is None: sl = []
        self.sl = sl

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From andrew at acooke.org  Thu Feb 12 17:15:08 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 19:15:08 -0300 (CLST)
Subject: Problem with objects copying each other in memory
In-Reply-To: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
Message-ID: <6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>


you're setting the new knight's "sl" to the value self.sl and then adding
values to it.  that's the same list - so you are adding values to the
self.sl list when you add them to the knight's sl.

this is easier to understand just by seeing the fix, which is to use:

temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))

which will make a new copy of the list, so you are only adding to the sl
in the (new) knight.

andrew



dlocpuwons wrote:
> Using Python 2.6.1...
>
> I am (attempting) to make an A* search for a chess problem, but I am
> running into a really annoying shared memory issue in my successor
> function. Here it is stripped down to the important parts that relate
> to my problem.
>
> def successors(self):
> 		result = []
> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
> 2], [-1, -2]] #possible moves for a knight
>
> 		for i in moves:
> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
> 			temp.x += i[0]
> 			temp.y += i[1]
> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to the
> visited states list
> 			result.append(temp)
> 		return result
>
> The method creates a temporary Knight object, increments it to the new
> position and then adds this new position to its list of visited
> states. Then it returns a list of these 8 new objects. The problem
> seems to be with the "result.sl.append()" line. As the method chugs
> along and creates the new objects the "temp.sl" lines seems to stay in
> memory, so when the method is done all the new objects have all the
> new states that were made over the course of the method instead of
> just their own created in the loop. For example when I try to get
> successors for a piece that is initially at (2,2) with no previously
> visited states, the method prints this out for the sl (state list)
> value
>
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
> 0]]
>
> but what it should print out is
>
> [[2, 2], [4, 3]]
> [[2, 2], [4, 1]]
> [[2, 2], [0, 3]]
> [[2, 2], [0, 1]]
> [[2, 2], [3, 4]]
> [[2, 2], [3, 0]]
> [[2, 2], [1, 4]]
> [[2, 2], [1, 0]]
>
> It sort of seems like python is trying to be too smart and is trying
> to keep things in memory. Is there anyway to work around this?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From rt8396 at gmail.com  Thu Feb 12 17:22:05 2009
From: rt8396 at gmail.com (r)
Date: Thu, 12 Feb 2009 14:22:05 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <7a52418e-82b7-4901-8c82-d90ce70160b7@v39g2000yqm.googlegroups.com>

On Feb 12, 2:04?pm, azrael <jura.gro... at gmail.com> wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.

I don't follow you here??

> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

There is a list of third party modules on the Python.org site and it
is huge! Tk is very simple i agree, but i would hate to double the
size of my python installer download just to have this or that module
built-in. Trust me you really don't want that. But i will agree a
better classification of modules would be nice

> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.
>
> Anyone I talk to says: "Oh my god, Python and GUI"

I will agree with you here. Just think what could be accomplished if
all the linux distro developers could band together to create one
golden linux distro. This level of collaboration would create a distro
so powerful the vibrations of it will cause Bill Gates house to slide
into lake Washington :).

Tk could use a polishing i much agree and so could IDLE. Maybe we
should start a revolution here? i am game!

> There are a dozen of modules that should be, if you ask me, be
> implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
> talk to, are using them. But everyone has to download them manually
> and hope that if someone is using their code, has also installed the
> needed modules.

Again i very much disagree here. We don't want to make Python a piece
of elephant-size MS bloatware. Not everybody needs or wants all these
libraries and maintaining this extra code-base puts exrta strain on
the Python dev team. We need them to concentrate on other more
important issues.

> My solution would be:
> Let's make an announcement on Python.org. something like this.
>
> We need Ideas for creating the a standard library in Python for Image
> processing. Tell ?us your problem. What do you think which feature
> should be implemented. Which transformation, which algorithm.
> Make a vote. This should be that not.

There is a library PIL but it could use some updating too.

> But how to start something like that. Anyone that sees a problem that
> should be solved, becomes the project leader. Find the best Ideas and
> make a good library.

Motivation is hard to find, and it's more than that. People have to
make a living, but we never know until we try. I am with you! Lest
revolutionize Python!

> It's is very good that people have a choice. But why not make some
> standards. I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......

Bloated_python == dead_Python

> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.
>
> This group has a lot of members. not to mention every Python Forum.
> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

I agree, anybody else out there want to add to this converstation?



From tjreedy at udel.edu  Thu Feb 12 17:24:05 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 12 Feb 2009 17:24:05 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <gn27i0$67k$1@ger.gmane.org>

azrael wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.
> 
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.

You are welcome to volunteer to write entries for the Python wiki.



From sambit2005 at gmail.com  Thu Feb 12 17:25:57 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Fri, 13 Feb 2009 11:25:57 +1300
Subject: getting caller
In-Reply-To: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
Message-ID: <9e680b420902121425y6c20f6abnee3afa4059e772d1@mail.gmail.com>

Hi

I am new to Python world

 I need a python script , which binds at a user defind port & sends to other
enity , which waits at particular port.
The other enity will respond & Python script should receive that at the
defined port

The communication will happen over UDP

e.g

Python Appl

IP: 10.116.78.90
Port : 3000


Other Enity :

IP: 10.116.98.87
Port : 3010


Pyhon Appl ------------>UDP  ----> Other Enity
                  <--------------------------


Please help
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From cameron.pulsford at gmail.com  Thu Feb 12 17:29:29 2009
From: cameron.pulsford at gmail.com (Cameron Pulsford)
Date: Thu, 12 Feb 2009 17:29:29 -0500
Subject: Problem with objects copying each other in memory
In-Reply-To: <6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
Message-ID: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>

Thanks, that did it! Why is that the case though? Or rather, why do  
the assignments to temp.x and temp.y not effect the self.x and self.y?  
How come I only run into the problem with the list?


On Feb 12, 2009, at 5:15 PM, andrew cooke wrote:

>
> you're setting the new knight's "sl" to the value self.sl and then  
> adding
> values to it.  that's the same list - so you are adding values to the
> self.sl list when you add them to the knight's sl.
>
> this is easier to understand just by seeing the fix, which is to use:
>
> temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))
>
> which will make a new copy of the list, so you are only adding to  
> the sl
> in the (new) knight.
>
> andrew
>
>
>
> dlocpuwons wrote:
>> Using Python 2.6.1...
>>
>> I am (attempting) to make an A* search for a chess problem, but I am
>> running into a really annoying shared memory issue in my successor
>> function. Here it is stripped down to the important parts that relate
>> to my problem.
>>
>> def successors(self):
>> 		result = []
>> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
>> 2], [-1, -2]] #possible moves for a knight
>>
>> 		for i in moves:
>> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>> 			temp.x += i[0]
>> 			temp.y += i[1]
>> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to  
>> the
>> visited states list
>> 			result.append(temp)
>> 		return result
>>
>> The method creates a temporary Knight object, increments it to the  
>> new
>> position and then adds this new position to its list of visited
>> states. Then it returns a list of these 8 new objects. The problem
>> seems to be with the "result.sl.append()" line. As the method chugs
>> along and creates the new objects the "temp.sl" lines seems to stay  
>> in
>> memory, so when the method is done all the new objects have all the
>> new states that were made over the course of the method instead of
>> just their own created in the loop. For example when I try to get
>> successors for a piece that is initially at (2,2) with no previously
>> visited states, the method prints this out for the sl (state list)
>> value
>>
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>> 0]]
>>
>> but what it should print out is
>>
>> [[2, 2], [4, 3]]
>> [[2, 2], [4, 1]]
>> [[2, 2], [0, 3]]
>> [[2, 2], [0, 1]]
>> [[2, 2], [3, 4]]
>> [[2, 2], [3, 0]]
>> [[2, 2], [1, 4]]
>> [[2, 2], [1, 0]]
>>
>> It sort of seems like python is trying to be too smart and is trying
>> to keep things in memory. Is there anyway to work around this?
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>



From andrew at acooke.org  Thu Feb 12 18:04:23 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 12 Feb 2009 20:04:23 -0300 (CLST)
Subject: Problem with objects copying each other in memory
In-Reply-To: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
Message-ID: <54753ad5197ca440238714f7e1c8ffae.squirrel@acooke.dyndns.org>


the official answer to that question is here -
http://docs.python.org/reference/datamodel.html?highlight=containers - at
about the 6th paragraph where it talks about "containers".

i think it's a hard question and really in a sense (imho) the real reason
is just that this tends to be the best compromise for the kind of language
that python is.

andrew


Cameron Pulsford wrote:
> Thanks, that did it! Why is that the case though? Or rather, why do
> the assignments to temp.x and temp.y not effect the self.x and self.y?
> How come I only run into the problem with the list?
>
>
> On Feb 12, 2009, at 5:15 PM, andrew cooke wrote:
>
>>
>> you're setting the new knight's "sl" to the value self.sl and then
>> adding
>> values to it.  that's the same list - so you are adding values to the
>> self.sl list when you add them to the knight's sl.
>>
>> this is easier to understand just by seeing the fix, which is to use:
>>
>> temp = Knight(self.x, self.y, self.g, self.h, self.gp, list(self.sl))
>>
>> which will make a new copy of the list, so you are only adding to
>> the sl
>> in the (new) knight.
>>
>> andrew
>>
>>
>>
>> dlocpuwons wrote:
>>> Using Python 2.6.1...
>>>
>>> I am (attempting) to make an A* search for a chess problem, but I am
>>> running into a really annoying shared memory issue in my successor
>>> function. Here it is stripped down to the important parts that relate
>>> to my problem.
>>>
>>> def successors(self):
>>> 		result = []
>>> 		moves = [[2, 1], [2, -1], [-2, 1], [-2, -1], [1, 2], [1, -2], [-1,
>>> 2], [-1, -2]] #possible moves for a knight
>>>
>>> 		for i in moves:
>>> 			temp = Knight(self.x, self.y, self.g, self.h, self.gp, self.sl)
>>> 			temp.x += i[0]
>>> 			temp.y += i[1]
>>> 			temp.sl.append([temp.x, temp.y]) #Adds the new current state to
>>> the
>>> visited states list
>>> 			result.append(temp)
>>> 		return result
>>>
>>> The method creates a temporary Knight object, increments it to the
>>> new
>>> position and then adds this new position to its list of visited
>>> states. Then it returns a list of these 8 new objects. The problem
>>> seems to be with the "result.sl.append()" line. As the method chugs
>>> along and creates the new objects the "temp.sl" lines seems to stay
>>> in
>>> memory, so when the method is done all the new objects have all the
>>> new states that were made over the course of the method instead of
>>> just their own created in the loop. For example when I try to get
>>> successors for a piece that is initially at (2,2) with no previously
>>> visited states, the method prints this out for the sl (state list)
>>> value
>>>
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>> [[2, 2], [4, 3], [4, 1], [0, 3], [0, 1], [3, 4], [3, 0], [1, 4], [1,
>>> 0]]
>>>
>>> but what it should print out is
>>>
>>> [[2, 2], [4, 3]]
>>> [[2, 2], [4, 1]]
>>> [[2, 2], [0, 3]]
>>> [[2, 2], [0, 1]]
>>> [[2, 2], [3, 4]]
>>> [[2, 2], [3, 0]]
>>> [[2, 2], [1, 4]]
>>> [[2, 2], [1, 0]]
>>>
>>> It sort of seems like python is trying to be too smart and is trying
>>> to keep things in memory. Is there anyway to work around this?
>>> --
>>> http://mail.python.org/mailman/listinfo/python-list
>>>
>>>
>>
>>
>
>




From python.dev.9 at gmail.com  Thu Feb 12 18:44:45 2009
From: python.dev.9 at gmail.com (mercado)
Date: Thu, 12 Feb 2009 18:44:45 -0500
Subject: Passing a variable number of arguments to a function
Message-ID: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>

I have the following piece of code that is bugging me:

#-------------------------------------------------------------------------------
def someFunc(arg1, arg2=True, arg3=0):
    print arg1, arg2, arg3

someTuple = (
    ("this is a string",),
    ("this is another string", False),
    ("this is another string", False, 100)
)

for argList in someTuple:
    if len(argList) == 1:
        someFunc(argList[0])
    elif len(argList) == 2:
        someFunc(argList[0], argList[1])
    elif len(argList) == 3:
        someFunc(argList[0], argList[1], argList[2])
#-------------------------------------------------------------------------------

Is it possible to rewrite this code so I don't have that awkward if
statement at the bottom that passes every variation in the number of
arguments to the function?  I know that it's possible to define a function
to accept a variable number of parameters using *args or **kwargs, but it's
not possible for me to redefine this function in the particular project I'm
working on.

What I would really like to do is something like this (pseudocode) and do
away with the if statement completely:

#-------------------------------------------------------------------------------
def someFunc(arg1, arg2=True, arg3=0):
    print arg1, arg2, arg3

someTuple = (
    ("this is a string",),
    ("this is another string", False),
    ("this is another string", False, 100)
)

for argList in someTuple:
    someFunc(expandArgList(argList))
#-------------------------------------------------------------------------------

Is this possible?  Thanks in advance.
-------------- next part --------------
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From akitada at gmail.com  Thu Feb 12 18:45:32 2009
From: akitada at gmail.com (Akira Kitada)
Date: Fri, 13 Feb 2009 08:45:32 +0900
Subject: New book "The Python Programming Language" by Guido van Rossum
Message-ID: <90bb445a0902121545s77378e59y74d63cee8d9ba02e@mail.gmail.com>

The Python Programming Language by Guido van Rossum, Raymond Hettinger,
Jack Diedrich, David Beazley, David Mertz, Nicholas Coghlan to be published.
http://www.amazon.co.uk/Python-Programming-Language-Guido-Rossum/dp/0132299690

Anyone found the TOC of this?

Thanks,


From clp2 at rebertia.com  Thu Feb 12 18:51:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 12 Feb 2009 15:51:25 -0800
Subject: Passing a variable number of arguments to a function
In-Reply-To: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>
References: <2678157f0902121544n5b5a49fer85e1054ece8f8076@mail.gmail.com>
Message-ID: <50697b2c0902121551s8bbf434hd6be17e7cee1f333@mail.gmail.com>

On Thu, Feb 12, 2009 at 3:44 PM, mercado <python.dev.9 at gmail.com> wrote:
> I have the following piece of code that is bugging me:
>
> #-------------------------------------------------------------------------------
> def someFunc(arg1, arg2=True, arg3=0):
>     print arg1, arg2, arg3
>
> someTuple = (
>     ("this is a string",),
>     ("this is another string", False),
>     ("this is another string", False, 100)
> )
>
> for argList in someTuple:
>     if len(argList) == 1:
>         someFunc(argList[0])
>     elif len(argList) == 2:
>         someFunc(argList[0], argList[1])
>     elif len(argList) == 3:
>         someFunc(argList[0], argList[1], argList[2])
> #-------------------------------------------------------------------------------
>
> Is it possible to rewrite this code so I don't have that awkward if
> statement at the bottom that passes every variation in the number of
> arguments to the function?  I know that it's possible to define a function
> to accept a variable number of parameters using *args or **kwargs, but it's
> not possible for me to redefine this function in the particular project I'm
> working on.

There is a nicely symmetrical calling syntax that does the inverse of
* in a function declaration:

for argList in someTuple:
    someFunc(*argList)

There's also an analogous func(**dictOfKwdArgs) call syntax.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From john106henry at hotmail.com  Thu Feb 12 18:55:37 2009
From: john106henry at hotmail.com (John Henry)
Date: Thu, 12 Feb 2009 15:55:37 -0800 (PST)
Subject: Invoking CutePDF from within Python
Message-ID: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>

Hi all,

I have a need to invoke CutePDF from within a Python program.  The
program creates an EXCEL spreadsheet and set the print area and
properties.  Then I wish to store the spreadsheet in a PDF file.
xtopdf does not work well (text only).  ReportLab is an overkill.
PyPDF can only shuffle PDF pages.

All I need is to say "Print this to CUTEPDF and store as xyz.pdf".

I found that this can be done in VB but I do not know VB,
unfortunately.

Private Sub Print_PDF()

     Dim lRetVal As Long
     Dim hKey As Long
     Dim sValue As String
     lRetVal = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\Custom PDF
Printer",  _
                    0&, vbNullString, REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS, _
                    0&, hKey, lRetVal)
     sValue = "C:\Sample.pdf"
     RegSetValueExString hKey, "OutputFile", 0&, REG_SZ, sValue, Len
(sValue)
     sValue = "1"
     RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
(sValue)

     Dim worddoc As Word.Document
     Set worddoc = wordapp.Documents.Open("C:\Sample.doc")
     wordapp.ActivePrinter = "Custom PDF Printer"
     wordapp.PrintOut
     worddoc.Close

     sValue = "0"
     RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
(sValue)
     RegCloseKey (hKey)

End Sub


From http  Thu Feb 12 18:59:08 2009
From: http (Paul Rubin)
Date: 12 Feb 2009 15:59:08 -0800
Subject: New book "The Python Programming Language" by Guido van Rossum
References: <mailman.9451.1234482336.3487.python-list@python.org>
Message-ID: <7x3aejgqb7.fsf@ruckus.brouhaha.com>

Akira Kitada <akitada at gmail.com> writes:
> The Python Programming Language by Guido van Rossum, Raymond Hettinger,
> Jack Diedrich, David Beazley, David Mertz, Nicholas Coghlan to be published.
> http://www.amazon.co.uk/Python-Programming-Language-Guido-Rossum/dp/0132299690

Wow!  But it says the pub date is 28 Aug 2009.

> Anyone found the TOC of this?

Chances are, it's still being written and the final TOC is not yet known.


From jason.scheirer at gmail.com  Thu Feb 12 19:13:11 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Thu, 12 Feb 2009 16:13:11 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <47c331cb-5adb-42ef-9741-8537f91b82e8@p13g2000yqc.googlegroups.com>

On Feb 12, 12:04?pm, azrael <jura.gro... at gmail.com> wrote:
> Sometimes I really get confused when looking out for a modul for some
> kind of need. Sometimes I get frightened when I get the resaults. 8
> wraper for this, 7 wrapers for that, 10 modules for anything. Between
> them are maybe some kind of small differences, but to work with any of
> the modules, I have to spend 10 hours of reading the help, If there is
> any at all.
>
> I think that there should be a list on python.org of supported or
> sugested modules for some need. For example Database access. Or GUI
> Building. It is a complete pain in the ass. Let's face the true, TK is
> out of date. There should be another one used and appended to the
> standard Python Library. One that plays well with other platforms. And
> if it does't, let's make it play better.
>
> Why will Microsoft's products kick the ass of open source. Because
> anyone does what he wants. Let's say There are 5 GUI libraries
> competing against each other. Think about it what could these 5 teams
> acomplish if they would work together. Or maybe a framework for RAD
> GUI devbelopment. after 10 years of python, there is still not one
> application for GUI Building that can beat Visual Studio.
>
> Anyone I talk to says: "Oh my god, Python and GUI"
>
> There are a dozen of modules that should be, if you ask me, be
> implemented into Python. Like NumPy, SciPY, PIL. A lot of people I
> talk to, are using them. But everyone has to download them manually
> and hope that if someone is using their code, has also installed the
> needed modules.
>
> My solution would be:
> Let's make an announcement on Python.org. something like this.
>
> We need Ideas for creating the a standard library in Python for Image
> processing. Tell ?us your problem. What do you think which feature
> should be implemented. Which transformation, which algorithm.
> Make a vote. This should be that not.
>
> But how to start something like that. Anyone that sees a problem that
> should be solved, becomes the project leader. Find the best Ideas and
> make a good library.
>
> It's is very good that people have a choice. But why not make some
> standards. I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......
>
> One other thing. I am not looking for war on groups. I just would like
> to discuss some things that drive me crazy while using Python.
>
> This group has a lot of members. not to mention every Python Forum.
> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

Now hold on here, Microsoft has a pretty schizophrenic opinion on GUIs
itself. Over the years you've had direct Win32 calls, the MFC
libraries, then WinForms and later WPF on .NET. If I were a C++/C#
developer new to Windows, which one should I go with? Or how about I
want to be cross-platform and start looking into Fox or QT or even
GTK?

The only difference between this and the number of Python GUIs is that
your version of Visual Studio sticks around for a few years. You could
standardize on a single version of the GUI you're using (say, WX) and
declare it to have a 5 year lifespan in your organization, install QT
builder and use that, or any of a large number of options. Don't
expect other people to make the decision for you, though, as an open
source environment brings about a plurality of options. Python has a
far broader scope as a tool for all kinds of tasks than a GUI-Centric
Microsoft development environment, and assuming every Python developer
wants to focus on making Python a vehicle of platform-specific GUIs
for producing shrink-wrapped software is a little off base.

> Anyone I talk to says: "Oh my god, Python and GUI"

Have these people needed to spend much time getting to know any one
GUI environment? They all suck in every language at first, then the
Stockholm syndrome sets in and it's not so bad.

The problem here also is that there have been attempts to get
something going that sputtered and failed (a sort of anygui module).
It's relatively easy to standardize on how to talk to a relational
database (that PEP is nice and solid), but looking at a grand unified
way of talking to so many different paradigms of GUI library, writing
bindings, testing, etc. is a much larger, less sensical beast. The
cross-platform UIs like Swing or QT all feel slightly out-of-place on
many systems because the interface elements and design decisions are
different from platform to platform.

If you want a platform-integrated GUI, use Glade/GTK/Python or QT
Designer/Python in Linux, XCode/Interface Builder/PyObjC in OSX, and
even consider IronPython and the .Net GUI stuff on Windows. Heck, I've
done some Swing and Jython and it was not as bad as writing Swing in
Java.

Might I also suggest that if you are struggling to make a proper GUI
in Python, and a GUI is what you need, that Python is probably not the
right tool for you to be using to get the job done.


From jura.grozni at gmail.com  Thu Feb 12 19:22:32 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 16:22:32 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<B0E459C1-CF22-4A26-85D7-F23E40FCA446@semanchuk.com>
	<mailman.9434.1234470281.3487.python-list@python.org>
Message-ID: <678601bf-65ef-4afa-afc5-2d4cef4d457f@v42g2000yqj.googlegroups.com>

On Feb 12, 9:24?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> Philip Semanchuk wrote:
>
> > On Feb 12, 2009, at 3:04 PM, azrael wrote:
>
> >> Why will Microsoft's products kick the ass of open source. Because
> >> anyone does what he wants. Let's say There are 5 GUI libraries
> >> competing against each other. Think about it what could these 5 teams
> >> acomplish if they would work together. Or maybe a framework for RAD
> >> GUI devbelopment. after 10 years of python, there is still not one
> >> application for GUI Building that can beat Visual Studio.
>
> > Let me know when Visual Studio tries to address building GUIs for
> > Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to
> > oranges, or chalk and cheese if you're from that part of the world.
>
> While your point is obviously good, it only applies if you
> even care about building for OS X, Gnome etc. If all you
> want is build on Windows (or Gnome or KDE or whatever) then
> the cross-platformness of any proposed toolkit is worthless
> and may even be a drawback if it reduces its functionality
> to a lowest common denominator.
>
> I have nothing really to say about GUI-building whatsits in
> general; I don't have cause to use them myself so I simply
> stand back and let their proponents fight it out. I just
> wanted to point out that playing the cross-platform card
> does not mean the game is over.
>
> TJG

OK. If I don't use GUIs, is there anything other that I do. Is there
anything else where I can contribute. Maybe there should be a better
networking, crypto, database connection library. Or whatever.

Forget about Crossplatform Gui Building. That is something that the
developers from wxWidgets think about. Where is the point of python in
crossplatform compability if I download on windows machine a piece of
code writen for GTK and I don't have anything installed to support it.
Again I am going to make some downloads. Python is bundled with TK,
which is out of date.



From jura.grozni at gmail.com  Thu Feb 12 19:39:06 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 16:39:06 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
Message-ID: <7160ddaf-b202-4e41-a8a5-b12a280ca04e@v13g2000yqm.googlegroups.com>

On Feb 12, 9:40?pm, Christian Heimes <li... at cheimes.de> wrote:
> azrael wrote:
> > I think that there should be a list on python.org of supported or
> > sugested modules for some need. For example Database access. Or GUI
> > Building. It is a complete pain in the ass. Let's face the true, TK is
> > out of date. There should be another one used and appended to the
> > standard Python Library. One that plays well with other platforms. And
> > if it does't, let's make it play better.
>
> The Python core will not ship with another GUI toolkit. TK may be
> removed from the core in some distant future but we - the Python core
> development team - will *not* make a choice between GTK, WX and Qt.
>
> > One other thing. I am not looking for war on groups. I just would like
> > to discuss some things that drive me crazy while using Python.
>
> In your opinion all third party are bad. You like to have one monolithic
> block of software. That's a typical Microsoft approach. Lot's of people
> from the open source community prefer small and loosely coupled pieces
> of software. One of the greatest ruler of all time once said "divide et
> impera" -- divide it in small pieces to make it much easier to conquer
> every piece by its own. We are following the same path here.
>
> Nobody is going to stop you from creating a large bundle of useful
> extensions as long as you follow the licenses. In fact lots of people
> may appreciate a bundle. But the Python core package will always stay
> small and agile.
>
> Christian

I understand that. completely. I don't think that third party is bad.
It is great that someone has an Idea and decides to make a new
project. But why not adopting best practices or maybe even make a
small effort to construct better support for some popular and commonly
used modules. If these modules always stay third party, there will
come a day when they stop being developed. At this point , Python
looses a good module from beeing developed any further. And some time
later, someone else starts again from scratch and make something new.

I came to Python because it has some features that always annoyed me
in C++ or Java. The diference between Java and Python that Java is
today way much often used thaen python, has a much larger Library
collection. I am mainly afraid that Python will become just a small
Scripting languages. There are a lot of people that say that they
would start Python, but they dont't want to because they don't want to
get their results in Comand line. I don't say that Comandline is bad,
but I think about the common user.


From rhodri at wildebst.demon.co.uk  Thu Feb 12 19:51:10 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 00:51:10 -0000
Subject: Problem with objects copying each other in memory
In-Reply-To: <EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>
	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<EF7CE662-C7AD-441B-B958-ACC64D2A352E@gmail.com>
Message-ID: <op.uo9lzkb6a8ncjz@gnudebst>

On Thu, 12 Feb 2009 22:29:29 -0000, Cameron Pulsford  
<cameron.pulsford at gmail.com> wrote:

> Thanks, that did it! Why is that the case though? Or rather, why do the  
> assignments to temp.x and temp.y not effect the self.x and self.y? How  
> come I only run into the problem with the list?

Variable names and assignment don't work the same way in Python as they
do in C (say).  What assignment does is to attach the name on the left
to the object on the right.  Obviously this is oversimplifying, since
"the name on the left" could be a list or dictionary element or the like,
but the principle holds: variables aren't objects themselves, they're
just references to objects.

For your ordinary everyday integers, this is arranged to be no different
 from normal.  Suppose we have

     x = 5
     y = x
     x = x + 1
     print y

Then we start by creating an integer object with the value 5 and labelling
it "x".  Then we pick up that object and label it 'y' as well.  The next
line causes us to create an integer object with the value 1, pick up the
object we called 'x', and tell that object to add the '1' object to itself.
That results in creating a brand new object (with the value 6), which we
then label 'x'.  The original '5' object (still labelled 'y') hasn't been
changed by this, because Python does arithmetic by creating new integer
objects.

Lists operate the same way for concatenation and repetition.

    a = [1, 2, 3]
    b = [4, 5, 6]
    c = a
    a = a + b
    print c

The "a = a + b" line creates a new list consisting of the elements of
the old list 'a' followed by the elements of the old list 'b', without
changing either of those lists in the slightest, and then calls this
new list 'a'.  The old list is still hanging around, and still has the
label 'c' attached to it.

The differences from your expectations arise because lists are mutable,
and integers aren't.  In other words we can change the contents of a
list "in place" without creating a new list.

     a = [1, 2, 3]
     b = a
     a.append(4)
     print b

Here, the list has both labels 'a' and 'b' attached to it.  When we
call a.append, it doesn't create a new list or anything like that,
it just makes the existing list larger and tacks the new value on
the end.  Because it's still the same list as before, it's still
got both names attached to it, so when you print 'b' out you see
the changed list [1, 2, 3, 4].

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From argo785 at gmail.com  Thu Feb 12 20:09:26 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Thu, 12 Feb 2009 17:09:26 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<op.uo8fbuazwepdt4@ericb.pragmadev>
Message-ID: <279ea3e5-edcb-42a6-a7b8-016d55cd7453@f3g2000yqf.googlegroups.com>

On Feb 12, 4:29?am, "Eric Brunel" <see.signat... at no.spam> wrote:
> On Thu, 12 Feb 2009 06:06:06 +0100, <argo... at gmail.com> wrote:
>
> [snip]
>
> > My only (minor) complaint is that Tk
> > doesn't draw text antialiased in the various widgets (menus, labels,
> > buttons, etc.).
>
> ?From version 8.5 of tcl/tk, it's supposed to do it. See this page:http://www.tcl.tk/software/tcltk/8.5.tml
> under 'Highlights of Tk 8.5', item 'Font rendering'. It seems to talk only ?
> about X11 and Mac OS X; don't know if it works on Windows...

I also don't know about MS Windows. I've been fortunate enough to not
have to use that OS for *years*.

Also, after some more searching, found this:

http://tkinter.unpythonic.net/wiki/Tk85AndPython

And according to [this](http://bugs.python.org/issue2983), the ttk
support has been merged into Python 2.7/3.1 as of about 2 weeks ago.


From rhodri at wildebst.demon.co.uk  Thu Feb 12 20:10:59 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 01:10:59 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<6viv4bFk8gonU1@mid.uni-berlin.de>
	<DlYkl.10377$hc1.9046@flpi150.ffdc.sbc.com>
Message-ID: <op.uo9mwlmta8ncjz@gnudebst>

On Thu, 12 Feb 2009 16:44:56 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> I simply ask, "How do I get around the problem?"

Run your program from the command line, or by double-clicking.
You've been told this several times now.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From notvalid2 at sbcglobal.net  Thu Feb 12 20:16:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 17:16:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9419.1234461666.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
Message-ID: <mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>

Greetings and salutations.

I just uninstalled all traces of (Active) pythonWin 2.5.2 from this machine, 
In fact, I uninstalled python 2.5.2 with IDLE from this machine. I then 
reinstalled the latter. Then I ran the program. XP Pro.

I then went to another machine that has never had pythonWin on it all, but 
does have python 2.5.2 with IDLE. I ran the same program there. W2K.

In both cases, I got the output below. Your conclusions?

===========================Output on Interactive Shell Screen===========
GUI self----------->>>>:  <__main__.Sentuser_GUI instance at 0x02154058>
counter:  3
OSett self =  <__main__.Sentuser_GUI instance at 0x02154058> type = <type 
'instance'>
gray scale now--wtw:  True
Set OSDiag sdict
body from OSDialog, self = .35167928 type = <type 'instance'>
apply OSD ok
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python25\Lib\lib-tk\Tkinter.py", line 1403, in __call__
     return self.func(*args)
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 553, in OperationalSettings
     dialog = OperationalSettingsDialog( self.master, set_loc_dict )
   File 
"C:\Sandia_Meteors\New_Sentinel_Development\Sentuser_Utilities_Related\sentuser\sentuserNC25-Dev4.py", 
line 81, in __init__
     tkSimpleDialog.Dialog.__init__(self, parent)
   File "C:\Python25\lib\lib-tk\tkSimpleDialog.py", line 69, in __init__
     self.wait_visibility() # window needs to be visible for the grab
   File "C:\Python25\Lib\lib-tk\Tkinter.py", line 415, in wait_visibility
     self.tk.call('tkwait', 'visibility', window._w)
TclError: window ".35167928" was deleted before its visibility changed


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From rhodri at wildebst.demon.co.uk  Thu Feb 12 20:27:54 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 01:27:54 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
Message-ID: <op.uo9nosqga8ncjz@gnudebst>

On Fri, 13 Feb 2009 01:16:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> Greetings and salutations.
>
> I just uninstalled all traces of (Active) pythonWin 2.5.2 from this  
> machine, In fact, I uninstalled python 2.5.2 with IDLE from this  
> machine. I then reinstalled the latter. Then I ran the program. XP Pro.
>
> I then went to another machine that has never had pythonWin on it all,  
> but does have python 2.5.2 with IDLE. I ran the same program there. W2K.
>
> In both cases, I got the output below. Your conclusions?

That you haven't listened to a word anyone has said.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jura.grozni at gmail.com  Thu Feb 12 20:48:33 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 17:48:33 -0800 (PST)
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
	<mailman.9436.1234471506.3487.python-list@python.org>
Message-ID: <c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>

On Feb 12, 9:42?pm, Christian Heimes <li... at cheimes.de> wrote:
> azrael wrote:
> > On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
> >> azrael <jura.gro... at gmail.com> writes:
> >>> To be honest, in compare to Visual Studio, Gui Builders for wx
> >>> widgets are really bad.
> >> That's because Visual Studio is a Microsoft product to build
> >> interfaces for Microsoft products.
>
> >> wx on the other hand is cross platform and ergo, much more
> >> complicated.
>
> > I think that WX is really great but there is really a great lack of a
> > builder.
>
> This isn't a Python problem - really. Please discuss your issues with
> the WX Gui builder on a WX list. We can't do anything about it.
>
> Christian

How come that it is a problem for the people from WX. It is also a
problem of Python. Python people say that that is not their problem.
Let wX team make the work. But we, who program in python use also wX.
The development of such a tool would make us all a big favour. Well if
99 percent of computer users use GUIs an prefer it in comparison with
comand line, Why should it be a pain in the ass to make a application
that we could offer to normal common users.


From cjns1989 at gmail.com  Thu Feb 12 20:48:35 2009
From: cjns1989 at gmail.com (Chris Jones)
Date: Thu, 12 Feb 2009 20:48:35 -0500
Subject: Ipython - Do they have a separate mailing list or newsgroup?
Message-ID: <20090213014835.GC2889@turki.gavron.org>

Just wondering if ipython is supported elsewhere.

Thanks,

CJ



From cournape at gmail.com  Thu Feb 12 21:19:12 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 11:19:12 +0900
Subject: Ipython - Do they have a separate mailing list or newsgroup?
In-Reply-To: <20090213014835.GC2889@turki.gavron.org>
References: <20090213014835.GC2889@turki.gavron.org>
Message-ID: <5b8d13220902121819w4ed2ac87gad056fccb0f18534@mail.gmail.com>

On Fri, Feb 13, 2009 at 10:48 AM, Chris Jones <cjns1989 at gmail.com> wrote:
> Just wondering if ipython is supported elsewhere.
>

The ipython mailing list is there:

http://projects.scipy.org/mailman/listinfo/ipython-user

David


From ldl08 at gmx.net  Thu Feb 12 21:20:54 2009
From: ldl08 at gmx.net (David)
Date: Fri, 13 Feb 2009 10:20:54 +0800
Subject: Ipython - Do they have a separate mailing list or newsgroup?
In-Reply-To: <20090213014835.GC2889@turki.gavron.org>
References: <20090213014835.GC2889@turki.gavron.org>
Message-ID: <4994D906.9020006@gmx.net>

Chris Jones wrote:
> Just wondering if ipython is supported elsewhere.

Indeed, indeed:

IPython-user mailing list
IPython-user at scipy.org
http://lists.ipython.scipy.org/mailman/listinfo/ipython-user

David


From cournape at gmail.com  Thu Feb 12 21:25:26 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 11:25:26 +0900
Subject: is there a project running (GUI Builder for Python ) ?
In-Reply-To: <c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<85fxijh2yt.fsf@agentultra.com>
	<4f44bff6-d0fc-496c-9055-a50fdd06f339@c12g2000yqj.googlegroups.com>
	<mailman.9436.1234471506.3487.python-list@python.org>
	<c6c6abd9-475c-4a11-9638-7b0fb6ad3872@v15g2000yqn.googlegroups.com>
Message-ID: <5b8d13220902121825k2ce7b07aw6c5713e525d4f490@mail.gmail.com>

On Fri, Feb 13, 2009 at 10:48 AM, azrael <jura.grozni at gmail.com> wrote:
> On Feb 12, 9:42 pm, Christian Heimes <li... at cheimes.de> wrote:
>> azrael wrote:
>> > On Feb 12, 8:25 pm, J Kenneth King <ja... at agentultra.com> wrote:
>> >> azrael <jura.gro... at gmail.com> writes:
>> >>> To be honest, in compare to Visual Studio, Gui Builders for wx
>> >>> widgets are really bad.
>> >> That's because Visual Studio is a Microsoft product to build
>> >> interfaces for Microsoft products.
>>
>> >> wx on the other hand is cross platform and ergo, much more
>> >> complicated.
>>
>> > I think that WX is really great but there is really a great lack of a
>> > builder.
>>
>> This isn't a Python problem - really. Please discuss your issues with
>> the WX Gui builder on a WX list. We can't do anything about it.
>>
>> Christian
>
> How come that it is a problem for the people from WX. It is also a
> problem of Python. Python people say that that is not their problem.
> Let wX team make the work. But we, who program in python use also wX.
> The development of such a tool would make us all a big favour. Well if
> 99 percent of computer users use GUIs an prefer it in comparison with
> comand line, Why should it be a pain in the ass to make a application
> that we could offer to normal common users.

Because not all discussion related to python happens on this ML- this
has nothing to do with the usefulness of GUI per-se. This is about
general questions about python.

David


From notvalid2 at sbcglobal.net  Thu Feb 12 21:40:12 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 12 Feb 2009 18:40:12 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
Message-ID: <I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>

 From Diez above.
What does *NOT* work is writing a Tkinter-based app in idle, and to run it
*FROM INSIDE* idle. Instead, open your explorer and double-click on the
pyhton-file your app is in. That's all that there is to it.

So this is the absolute truth? No wiggle room? One can never use a Tkinter 
program with IDLE, and execute it successfully. So IDLE doesn't issue a 
standard warning that says, "Get out of here with your Tkinter program, it 
will fail when you try to run it here. You have entered Tkinter hell. 
Good-bye."

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jura.grozni at gmail.com  Thu Feb 12 21:53:18 2009
From: jura.grozni at gmail.com (azrael)
Date: Thu, 12 Feb 2009 18:53:18 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9446.1234477452.3487.python-list@python.org>
Message-ID: <24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>

There is no need to make it elephant size. Python takes only 14 MB if
I am not wrong. Compare 10 GB of VS package in compare with that.
nothing. Python enthought edition is something really sweet. For
starters, Why does Python not have a build in library to handle
images. I don't get this. Why? PIL is great, but it could really need
some polish. I think that the last programming language I can remind
of that could not handle images, If I am not wrong was QBASIC.

All I hear when I talk to people who own or eork in SW companies is
"Python? Isn't that that small scripting language. This will never
bring a real application." I am tired of hearing this. Even Microsoft
implemented Python. Only because the GUI building I am thinking about
of moving to IronPython. But this great comunity holds me bac on
CPython.

We need better and not out of date libraries and modules. Python was
build because of bad experiences of bad programing languages. I sak
The Python Development team to listen to us users an developers.
listen to our problems.


From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:05:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:05:32 -0200
Subject: getting caller
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
Message-ID: <op.uo9r7iy2x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 19:26:26 -0200, Hamish McKenzie  
<hamish at valvesoftware.com> escribi?:

> so I'm trying to wrap some functionality around execfile but don't want  
> to modify the way it works.  specifically when you call execfile, it  
> automatically grabs globals and locals from the frame the execfile  
> exists in.
>
> so if I wrap execfile in a function, I need a way to reliably get at the  
> calling frame.

Instead of doing that, just pass the desired namespaces to be used; you'll  
want to use locals() and globals() for that.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:12:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:12:58 -0200
Subject: getting caller
References: <EC42140F113A234EA70D682A310D100A01DB12C72F@exchange07.valvesoftware.com>
	<9e680b420902121425y6c20f6abnee3afa4059e772d1@mail.gmail.com>
Message-ID: <op.uo9sjwhfx6zn5v@gabriel2.softlabbsas.com.ar>

(If you aren't replying to the original message, please post an entirely  
*new* one to create a new thread).

En Thu, 12 Feb 2009 20:25:57 -0200, Sambit Samal <sambit2005 at gmail.com>  
escribi?:

>  I need a python script , which binds at a user defind port & sends to  
> other
> enity , which waits at particular port.
> The other enity will respond & Python script should receive that at the
> defined port
> The communication will happen over UDP

See the SocketServer module:
http://docs.python.org/library/socketserver.html
There is a simple UDP server example at the end.

-- 
Gabriel Genellina



From damonwischik at gmail.com  Thu Feb 12 22:16:11 2009
From: damonwischik at gmail.com (Damon)
Date: Thu, 12 Feb 2009 19:16:11 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
Message-ID: <3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>

On Feb 12, 8:15?pm, Philip Semanchuk wrote:
> Let me know when Visual Studio tries to address building GUIs for ?
> Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to ?
> oranges, or chalk and cheese if you're from that part of the world.

Right now.

Use Visual Studio to program a .net application using Windows Forms.
Run it in Mono on Windows, or OS X, or Linux. You can even do it with
IronPython. Or, if you prefer a native look on each application, do it
with wx.net. The great thing about IronPython in .net is that you can
just link in any other .net library in whatever language it's written
in, without needing any sort of wrapper.

Admittedly, I haven't tried this, I'm just going by the hype I read on
the Mono and wx.net pages. Also, you can quibble whether it's Visual
Studio that tries to address this, or the Mono effort.

Damon.


From spacebar265 at gmail.com  Thu Feb 12 22:24:21 2009
From: spacebar265 at gmail.com (Spacebar265)
Date: Thu, 12 Feb 2009 19:24:21 -0800 (PST)
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
Message-ID: <c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>

On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>
> >> How would I do separate lines into words without scanning one character
> >> at a time?
>
> > Scan a line at a time, then split each line into words.
>
> > for line in open('myfile.txt'):
> > ? ? words = line.split()
>
> > should work for a particularly simple-minded idea of words.
>
> Or for a slightly less simple minded splitting you could try re.split:
>
> >>> re.split("(\w+)", "The quick brown fox jumps, and falls over.")[1::2]
>
> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

Using this code how would it load each word into a temporary variable.


From damonwischik at gmail.com  Thu Feb 12 22:39:07 2009
From: damonwischik at gmail.com (Damon)
Date: Thu, 12 Feb 2009 19:39:07 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
Message-ID: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>

On Feb 12, 8:40?pm, Christian Heimes wrote:
> In your opinion all third party are bad. You like to have one monolithic
> block of software. That's a typical Microsoft approach. Lot's of people
> from the open source community prefer small and loosely coupled pieces
> of software. One of the greatest ruler of all time once said "divide et
> impera" -- divide it in small pieces to make it much easier to conquer
> every piece by its own.

"Divide et impera" was a strategy used by the monolithic Roman empire
to divide and subjugate others. I hope that's not what happens to
Python!

The original poster complained about needing to go off to third-party
sites to hunt for software. I wonder if the Python team has ever
considered following the lead of miktex or R, and setting up a
centralized (mirrored) repository of packages? Let anyone who wants,
submit packages.

* Like R, every time there is a new version of Python, the repository
should rebuild the packages, for all supported platforms, and make
available all those that compile cleanly. R also forces you to write
properly structured documentation for every exposed function, before
the repository will accept it.

* Like miktex, when the user does "import foo", the Python interpreter
should (optionally) look for foo in its cached list of packages, and
download the latest version if necessary.

This works fine for R and miktex, and it has made my life very easy.

Damon.


From gagsl-py2 at yahoo.com.ar  Thu Feb 12 22:47:03 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 01:47:03 -0200
Subject: Why does way_1() obtain the correct list but way_2() gets an
	empty list?
References: <6vi779Fk0ogtU1@mid.individual.net>
Message-ID: <op.uo9t4p00x6zn5v@gabriel2.softlabbsas.com.ar>

En Thu, 12 Feb 2009 07:07:53 -0200, WP  
<no.i.dont at want.mail.from.spammers.com> escribi?:

> Hello group! This is probably a silly newbie mistake but consider the  
> following program:
>
> import libsbml
>
> def getSBMLModel(biomodel_path):
>      reader = libsbml.SBMLReader()
>
>      sbml_doc = reader.readSBML(biomodel_path)
>      sbml_model = None
>
>      if sbml_doc.getNumErrors() > 0:
>          print 'I couldn\'t read the file %s!' % biomodel_path
>          return None
>      else:
>          sbml_model = sbml_doc.getModel()
>
>      return sbml_doc.getModel() # None if file couldn't be opened

Note that sbml_doc.getModel() is called *twice*, the first one is  
discarded. Probably you want to replace the last line with: return  
sbml_model

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Thu Feb 12 22:56:20 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 03:56:20 -0000
Subject: Scanning a file character by character
In-Reply-To: <c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
Message-ID: <op.uo9uj6dya8ncjz@gnudebst>

On Fri, 13 Feb 2009 03:24:21 -0000, Spacebar265 <spacebar265 at gmail.com>  
wrote:

> On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> > On Mon, 09 Feb 2009 19:10:28 -0800, Spacebar265 wrote:
>>
>> >> How would I do separate lines into words without scanning one  
>> character
>> >> at a time?
>>
>> > Scan a line at a time, then split each line into words.
>>
>> > for line in open('myfile.txt'):
>> > ? ? words = line.split()
>>
>> > should work for a particularly simple-minded idea of words.
>>
>> Or for a slightly less simple minded splitting you could try re.split:
>>
>> >>> re.split("(\w+)", "The quick brown fox jumps, and falls  
>> over.")[1::2]
>>
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> Using this code how would it load each word into a temporary variable.

Why on earth would you want to?  Just index through the list.


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From cournape at gmail.com  Thu Feb 12 23:15:33 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 13:15:33 +0900
Subject: A little bit else I would like to discuss
In-Reply-To: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <5b8d13220902122015g431353bci7e473abb6390ac9a@mail.gmail.com>

On Fri, Feb 13, 2009 at 12:39 PM, Damon <damonwischik at gmail.com> wrote:
> The original poster complained about needing to go off to third-party
> sites to hunt for software. I wonder if the Python team has ever
> considered following the lead of miktex or R, and setting up a
> centralized (mirrored) repository of packages? Let anyone who wants,
> submit packages.

Of course they have, that's what pypi is for. Pypi does not solve all
the problems, though.

>
> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.
>
> * Like miktex, when the user does "import foo", the Python interpreter
> should (optionally) look for foo in its cached list of packages, and
> download the latest version if necessary.
>
> This works fine for R and miktex, and it has made my life very easy.

Yes, R in particular is very nice for this. But it is a complex
problem - and it is even more complex for python compared to R and
miktex, because python is more general. In particular, in R (and
miktex I guess ?), you rarely care about having several versions
installed at the same time (interpreter and/or packages), but in
python, this is often useful. This complicates matter quite a bit.
Having automatic download at import who annoy many users, me included.

For the time being, my opinion is that the only solution for
deployment on desktop apps on windows/mac os X is something like
Enthought distribution, which is self contained. But when you start
installing something outside Enthought, it can become tricky for
"average users" (the one who don't care about the technicalities).

cheers,

David


From pavlovevidence at gmail.com  Thu Feb 12 23:17:50 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 12 Feb 2009 20:17:50 -0800 (PST)
Subject: Python binaries with VC++ 8.0?
References: <6va201FijdteU1@mid.individual.net>
	<17612b99-0756-47a1-ae4f-5e05e18813cd@r41g2000prr.googlegroups.com>
	<38b2p4d6g521bi0rtjiat686pamkvke3i3@4ax.com>
Message-ID: <1df828ff-2bd4-4bcb-8c8d-9655dc44fae3@m42g2000yqb.googlegroups.com>

On Feb 9, 11:34?pm, Tim Roberts <t... at probo.com> wrote:
> Carl Banks <pavlovevide... at gmail.com> wrote:
>
> >I'm pretty sure 2.6.1 is compiled with 8.0. ?However, I think the
> >Visual C++ 8.0 uses msvcrt90.dll.
>
> No, the two digits of the DLL match the version number of C++. ?The
> confusion arises because the product is called "Visual Studio 2008", but it
> includes Visual C++ 9.0, and hence msvcrt90.dll. ?People say "VC8" when
> they really mean Visual Studio 2008.
>
> ? Visual Studio 98 ? ?- ?VC++ 6.0
> ? Visual Studio 2002 ?- ?VC++ 7.0
> ? Visual Studio 2003 ?- ?VC++ 7.1
> ? Visual Studio 2005 ?- ?VC++ 8.0
> ? Visual Studio 2008 ?- ?VC++ 9.0

Ah, that explains a lot.


Carl Banks


From banibrata.dutta at gmail.com  Thu Feb 12 23:36:59 2009
From: banibrata.dutta at gmail.com (Banibrata Dutta)
Date: Fri, 13 Feb 2009 10:06:59 +0530
Subject: Regarding Joystick
In-Reply-To: <aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
	<aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
Message-ID: <3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>

AFAIK, the mechanism / API / protocol to actuate the Camera's tilt, pan,
zoom functions are not standardized (happy to be corrected there!), so even
if you find something, it'd most likely be something very specific to a
particular device.
As for Joystick usage, I remember seeing one thread on that couple of months
back, so searching thru the archive should give you leads.

On Fri, Feb 13, 2009 at 3:33 AM, shreyas shah <shreyas22 at gmail.com> wrote:

> Hi ,
>
> I am trying to control the motion of the camera with help of joystick , i
> need some basic functionality where if i move a joystick to left the camera
> moves to the left . Can anyone help me with that ?
>
> Thanks
> Shreyas
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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From bkline at rksystems.com  Thu Feb 12 23:43:48 2009
From: bkline at rksystems.com (Bob Kline)
Date: Thu, 12 Feb 2009 23:43:48 -0500
Subject: Change in cgi module's handling of POST requests
In-Reply-To: <gn23u8$q09$1@ger.gmane.org>
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org>
Message-ID: <4994FA84.5070806@rksystems.com>

Joshua Kugler wrote:
>> We just upgraded Python to 2.6 on some of our servers and a number of our
>> CGI scripts broke because the cgi module has changed the way it handles
>> POST requests.  When the 'action' attribute was not present in the form 
>> element on an HTML page the module behaved as if the value of the
>> attribute was the URL which brought the user to the page with the form,
>> but without the query (?x=y...) part.
>
> This does not make sense.  Can you give an example?

Sure.  Here's a tiny repro script:

#!/usr/bin/python
import cgi, xml.sax.saxutils
def quote(me): return me and xml.sax.saxutils.quoteattr(str(me)) or ''
print """\
Content-type: text/html

<html><body><form method='post'><input name='x' value=%s>
<input type='submit'>
</form></body></html>""" % quote(cgi.FieldStorage().getvalue('x'))

####################  end of repro script  ########################

Try it out on this pre-2.6 Python page:

http://www.rksystems.com/cgi-bin/cgi-repro.py?x=y

When the page comes up, click Submit.  Click it several times.  No 
change in the content of the text field, which is populated when the 
page first comes up from the GET request's URL, and then subsequently 
from the POST request's parameters.

For comparison, here's the equivalent Perl page, which behaves the same way:

http://www.rksystems.com/cgi-bin/cgi-repro.pl?x=y

Or PHP; again, same behavior, no matter how many times you click the 
Submit button:

http://www.rksystems.com/cgi-repro.php?x=y

Now try the Python script above from a server where Python has been 
upgraded to version 2.6:

http://mahler.nci.nih.gov/cgi-bin/cgi-repro.py?x=y

Notice that when you click on the Submit button, the field is populated 
with the string representation of the list which FieldStorage.getvalue() 
returns.  Each time you click the submit button you'll see the effect 
recursively snowballing.  This is exactly the same script as the one 
behind the first URL above, byte for byte.

>> Now FieldStorage.getvalue () is 
>> giving the script a list of two copies of the value for some of the
>> parameters (folding in the parameters from the previous request) instead
>> of the single string it used to return for each.
>
> There is a function call to get only one value.  I think it's get_first() or
> some such.

That's true, but risky.  I have no guarantee that the value entered by 
the user on the form will be first on the list.  I might instead get the 
initial value carried over from the URL which brought up the form to 
begin with.  We're working around the problem by modifying the broken 
scripts to explicitly set the action attributes.

>
> Well, the CGI module hasn't had many changes.  There was this bug fix a few
> months back:
>
> http://svn.python.org/view?rev=64447&view=rev

Looks like that was where it happened.

> It is possible that by fixing a bug, they brought the behavior in line with
> what it *should* be.

That's certainly possible.  I'm not contending that Perl and PHP and the 
previous versions of Python all got it right and the new Python is 
wrong.  It could very well be the other way around.[1]  But my 
expectation, based on what I've seen happen over the years with other 
proposed changes to the language and the libraries, was that there would 
have been some (possibly extended) discussion of the risks of breaking 
existing code, and the best way to phase in the change with as little 
sudden breakage as possible.  I haven't been able to find that 
discussion, and I was hoping some kind soul would point me in the right 
direction.

>   Or maybe the browser behavior changed?

Clearly not, as you will see by using the same browser to try out the 
URLs above.  If you look at the HTML source when the page first comes up 
for each of the scripts, you'll see it's the same.  It's the behavior on 
the server (that is, in the Python library module) which changes.

>   The server
> does not care about an "action" attribute.  That only tells the browser
> where to send the data.

Well that's a pretty good formulation of the conclusion you would come 
to based on the behavior of all of Perl, PHP, and (pre-2.6) Python.  And 
intuitively, that's how one (or at least I) would expect things to 
work.  The parameters in the original URL are appropriately used to seed 
initial values in the form when the form is invoked with a GET request, 
but after that point it's hard to see them as anything but history.  But 
that's not how the new version of the cgi module is behaving.  It's 
folding in the parameters it finds in the original URL, which it gets 
from the environment's QUERY_STRING variable, in with the fields it 
parses from the POST request's body.

>   It is possible the browser did not properly format
> a request when there was no "action" attribute.

When the 'action' attribute is not present in the form element, the 
browser implicitly assigns it the value of the original URL which first 
brought up the page with the form.  This browser behavior has not 
changed.  It's doing the same thing no matter which version of which 
language and libraries are used to implement the CGI script (it has no 
idea what those are).  Nor, as far as I have been able to determine, is 
this behavior dependent on which (version of which) browser you're using.

>  Can you provide more details?

I think we should have enough specifics with what I've provided above to 
make it clear what's happening, but if you can think of anything I've 
left out which you think would be useful, let me know and I'll try to 
supply it.

Cheers,
Bob

[1] I haven't yet finished my attempts to parse the relevant RFCs; I 
assumed that the original authors and maintainers of this module (which 
includes the BDFL himself), would have been more adept at that than I 
am, which is one of the reasons I was hoping to find some discussion in 
the mailing list archives of the discussion of the proposed change in 
the module's behavior.



From mohitranka at gmail.com  Thu Feb 12 23:54:47 2009
From: mohitranka at gmail.com (mohit_ranka)
Date: Thu, 12 Feb 2009 20:54:47 -0800 (PST)
Subject: NNTPlib encoding issue
Message-ID: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>

I am getting unknown encoding like, "=?Utf-8?B?QWRyaWFu?=
<Adrian at discussions.microsoft.com>" (quotes for clarity) for name of
the author from nntplib module. which seems like an encoding issue
with NNTPLib module.

What should i do to get author name information in human readable
format.

Thanks and regards,
Mohit Ranka


From benjamin.kaplan at case.edu  Fri Feb 13 00:04:04 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 00:04:04 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
	<3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
Message-ID: <ec96e1390902122104i29f55944q125248d51277d1ad@mail.gmail.com>

On Thu, Feb 12, 2009 at 10:16 PM, Damon <damonwischik at gmail.com> wrote:

> On Feb 12, 8:15 pm, Philip Semanchuk wrote:
> > Let me know when Visual Studio tries to address building GUIs for
> > Windows, OS X, Gnome, and KDE. Until then, you're comparing apples to
> > oranges, or chalk and cheese if you're from that part of the world.
>
> Right now.
>
> Use Visual Studio to program a .net application using Windows Forms.
> Run it in Mono on Windows, or OS X, or Linux. You can even do it with
> IronPython. Or, if you prefer a native look on each application, do it
> with wx.net. The great thing about IronPython in .net is that you can
> just link in any other .net library in whatever language it's written
> in, without needing any sort of wrapper.
>

Windows.Forms isn't native in OS X or Linux though. To get a native look,
you need to use the Cocoa and GTK C-sharp bindings, which means you're not
using Visual Studio. wx is actually a wrapper around the native components,
so it will look nice on every platform that supports it (well, except KDE
because of the Qt license issue).


>
> Admittedly, I haven't tried this, I'm just going by the hype I read on
> the Mono and wx.net pages. Also, you can quibble whether it's Visual
> Studio that tries to address this, or the Mono effort.
>
> Damon.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Fri Feb 13 00:09:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:09:42 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <gn2van$tjs$1@ger.gmane.org>

Damon wrote:

> The original poster complained about needing to go off to third-party
> sites to hunt for software. I wonder if the Python team has ever

The 'Python team' is everyone who volunteers to help.
How about you?

> considered following the lead of miktex or R, and setting up a
> centralized (mirrored) repository of packages? Let anyone who wants,
> submit packages.

> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.
> 
> * Like miktex, when the user does "import foo", the Python interpreter
> should (optionally) look for foo in its cached list of packages, and
> download the latest version if necessary.
> 
> This works fine for R and miktex, and it has made my life very easy.

If you have an idea on how to improve the current package index, help 
improve it.  Appoint yourself the 'test with new release' manager.

tjr



From tjreedy at udel.edu  Fri Feb 13 00:12:56 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:12:56 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>	<mailman.9446.1234477452.3487.python-list@python.org>
	<24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
Message-ID: <gn2vgp$ueh$1@ger.gmane.org>

azrael wrote:

> We need better and not out of date libraries and modules. Python was
> build because of bad experiences of bad programing languages. I sak
> The Python Development team to listen to us users an developers.
> listen to our problems.

I ask you to help update a module or package that you care about.
Join the team and contribute.

tjr



From tjreedy at udel.edu  Fri Feb 13 00:23:34 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 00:23:34 -0500
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
Message-ID: <gn304o$vkn$1@ger.gmane.org>

W. eWatson wrote:
>  From Diez above.
> What does *NOT* work is writing a Tkinter-based app in idle, and to run it
> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
> pyhton-file your app is in. That's all that there is to it.
> 
> So this is the absolute truth? No wiggle room? One can never use a 
> Tkinter program with IDLE, and execute it successfully. So IDLE doesn't 
> issue a standard warning that says, "Get out of here with your Tkinter 
> program, it will fail when you try to run it here. You have entered 
> Tkinter hell. Good-bye."

Re-read my post about kids fighting to control a television.  Maybe they 
work together, maybe they crash the TV.  Hard to predict.

***ANY*** Python program that tries to grab and control the same 
resources that TK does may conflict with it.  There is no way that IDLE 
can have a list of, for instance, all event-grabbing mainloop programs.



From sudhandra_selvi at yahoo.co.in  Fri Feb 13 01:18:05 2009
From: sudhandra_selvi at yahoo.co.in (sudhandra selvi)
Date: Fri, 13 Feb 2009 11:48:05 +0530 (IST)
Subject: similar_text  in python
Message-ID: <647605.23303.qm@web8905.mail.in.yahoo.com>

Hi 
Does anyone know if Python has a function like similar_text in PHP. It
 compares two strings and returns a percentage for the match. Anyone
 know of anything like this in Python and would be willing to send
 along an example?

thanks
selvi



      Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/
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From apt.shansen at gmail.com  Fri Feb 13 01:37:47 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Thu, 12 Feb 2009 22:37:47 -0800
Subject: hpw to convert a linux python script ?
In-Reply-To: <gn20f7$d0e$1@ger.gmane.org>
References: <mailman.9346.1234382315.3487.python-list@python.org>
	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>
	<mailman.9352.1234385290.3487.python-list@python.org>
	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>
	<gn20f7$d0e$1@ger.gmane.org>
Message-ID: <7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>

> # Absolute path to the directory that holds media.
> # Example: "/home/media/media.lawrence.com/"
> MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'
>
> Note that most Windows APIs allow you to use the forward slash as a
> delimiter. It's mostly the command line and Windows Explorer that are
> snotty about insisting on the backslash.

Idle curiosity, why do you prefer that to:

MEDIA_ROOT = os.path.join(fsroot, 'Projects', 'PytDj', 'images')

Not arguing that one is actually better then the other, just curious.

In my own environment we have grown a whole big filesystem abstraction
layer because we have to be able to address the same resources on
network volumes in the same client on multiple OS's (mainly windows
and mac presently, but a linux client has long been a
consideration),... and on the mac having to sometimes use mac paths
(":this:that:other") and sometimes posix paths ("/this/that/other")
depending on what API layer I'm poking at in a given point of view...
so personally I just end up being mildly curious how everyone else
handles paths and such.

Cuz it was quite a bit of a pain early on.

--S


From brianlong at cox.net  Fri Feb 13 01:44:54 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Thu, 12 Feb 2009 22:44:54 -0800 (PST)
Subject: Break large file down into multiple files
Message-ID: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>

New to python.... I have a large file that I need to break up into
multiple smaller files. I need to break the large file into sections
where there are 65535 lines and then write those sections to seperate
files.  I am familiar with opening and writing files, however, I am
struggling with creating the sections and writing the different
sections to their own files.

Thanks

B


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 01:52:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 04:52:32 -0200
Subject: similar_text  in python
References: <647605.23303.qm@web8905.mail.in.yahoo.com>
Message-ID: <op.uo92puhkx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 04:18:05 -0200, sudhandra selvi  
<sudhandra_selvi at yahoo.co.in> escribi?:

> Does anyone know if Python has a function like similar_text in PHP. It
>  compares two strings and returns a percentage for the match. Anyone
>  know of anything like this in Python and would be willing to send
>  along an example?

See the difflib module.
http://docs.python.org/library/difflib.html

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 02:02:52 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 05:02:52 -0200
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <op.uo9262iyx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianlong at cox.net>  
escribi?:

> New to python.... I have a large file that I need to break up into
> multiple smaller files. I need to break the large file into sections
> where there are 65535 lines and then write those sections to seperate
> files.  I am familiar with opening and writing files, however, I am
> struggling with creating the sections and writing the different
> sections to their own files.

This function copies at most n lines from fin to fout:

def copylines(fin, fout, n):
   for i, line in enumerate(fin):
     fout.write(line)
     if i+1>=n: break

Now you have to open the source file, create new files as needed and  
repeatedly call the above function until the end of source file. You'll  
have to enhace it bit, to know whether there are remaining lines or not.

-- 
Gabriel Genellina



From brianlong at cox.net  Fri Feb 13 02:43:02 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Thu, 12 Feb 2009 23:43:02 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<mailman.9474.1234508570.3487.python-list@python.org>
Message-ID: <a158ea7e-0ab9-4dae-a217-7004859f13e9@m16g2000vbp.googlegroups.com>

On Feb 12, 11:02?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianl... at cox.net> ?
> escribi?:
>
> > New to python.... I have a large file that I need to break upinto
> > multiple smallerfiles. I need to break the large fileintosections
> > where there are 65535 lines and then write thosesectionsto seperate
> >files. ?I am familiar with opening and writingfiles, however, I am
> > struggling with creating thesectionsand writing the different
> >sectionsto their ownfiles.
>
> This function copies at most n lines from fin to fout:
>
> def copylines(fin, fout, n):
> ? ?for i, line in enumerate(fin):
> ? ? ?fout.write(line)
> ? ? ?if i+1>=n: break
>
> Now you have to open the source file, create newfilesas needed and ?
> repeatedly call the above function until the end of source file. You'll ?
> have to enhace it bit, to know whether there are remaining lines or not.
>
> --
> Gabriel Genellina

Gabriel ::

Thanks for the direction.  Do I simply define fin, fout and n as
variables above the def copylines(fin, fout, n): line?

Would it look like this?

fin = open('C:\Path\file')
fout = 'C:\newfile.csv')
n = 65535

def copylines(fin, fout, n):
    for i, line in enumerate(fin):
 ? ? ?fout.write(line)
 ? ? ?if i+1>=n: break

Thanks

B


From ivanov.maxim at gmail.com  Fri Feb 13 03:02:56 2009
From: ivanov.maxim at gmail.com (redbaron)
Date: Fri, 13 Feb 2009 00:02:56 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com>

> New to python.... I have a large file that I need to break up into
> multiple smaller files. I need to break the large file into sections
> where there are 65535 lines and then write those sections to seperate
> files.

If your lines are variable-length, then look at itertools recipes.

from itertools import izip_longest

def grouper(n, iterable, fillvalue=None):
    "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

with open("/file","r") as f:
    for lines in grouper(65535,f,""):
        data_to_write = '\n'.join(lines).rstrip("\n")
        ...
        <write data where you need it here>
        ...



From mail at microcorp.co.za  Fri Feb 13 03:27:11 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 13 Feb 2009 10:27:11 +0200
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
Message-ID: <01e001c98dba$310340a0$0d00a8c0@hendrik>

"azrael" <jurni at gmail.com> wrote:


> To be honest, in compare to Visual Studio, Gui Builders for wx widgets
> are really bad. Also completly for python there is not one good
> GuiBuilder. The only one I have seen that would come near VS was
> BoaConstructor, But the number of Bugs is just horrific. Too bad that
> no one is developing it further.

What are these horrific bugs - I was forced to use Boa on a project
recently, and I did not notice any - In fact, I was impressed because
everything that was there, seemed to be working properly.

- Hendrik



From anders.mackey at gmail.com  Fri Feb 13 03:28:09 2009
From: anders.mackey at gmail.com (Fisherking)
Date: Fri, 13 Feb 2009 00:28:09 -0800 (PST)
Subject: Match items in large list
References: <6c7720da-9e95-486c-9f28-c85ce3bc9a7e@q9g2000yqc.googlegroups.com>
	<mailman.9415.1234460188.3487.python-list@python.org>
Message-ID: <00402c5a-725f-4941-b335-f80fc63a781c@u13g2000yqg.googlegroups.com>

Thank you all for your answers! I must say I'm really impressed by the
willing to help and the quick responses in this group (since it is my
first post)!

I solved the problem using SQL-queries. I added a id, the same for
each item in a chain (two or more similar posts) and just updated the
database for each unique post. I had to do this anyway and I think it
is the simplest and quickest way!

thanks again!




From tim.wintle at teamrubber.com  Fri Feb 13 03:33:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 13 Feb 2009 08:33:49 +0000
Subject: thread. question
In-Reply-To: <gmq23p$dt3$1@ger.gmane.org>
References: <1234187238.7630.34.camel@tim-laptop>
	<gmpgbp$60o$1@ger.gmane.org> <1234193642.7630.63.camel@tim-laptop>
	<gmq23p$dt3$1@ger.gmane.org>
Message-ID: <1234514029.16298.5.camel@tim-laptop>

On Mon, 2009-02-09 at 21:02 +0100, Christian Heimes wrote:
> The module was renamed to _thread to stop people from using it directly.
> The extension module is the interface to some low level types and
> functions. Especially the usage of thread.start_new_thread is
> problematic, since it bypasses Python's high level threading API.

Ok, I'll take that in - I'll have a look around the threading module to
see what it is that it bypasses so I can persuade myself that _thread is
bad ...

> For the rest I have to agree with Jean-Paul. If you need performance
> don't use threads! Threads and performance are orthogonal -- sometimes
> they are even contradictorily.

I've taken that in too - "performance" here is over a non-uniform
workload (essentially a web server), but I'm probably best offloading
just about all the work to a secondary process (already passed most of
it) and dealing with requests in a completely synchronous process.

Tim



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 03:34:42 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 09:34:42 +0100
Subject: something wrong with isinstance
In-Reply-To: <8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <49953096$0$15292$426a74cc@news.free.fr>

redbaron a ?crit :
> Don't really sure, but try to define your class as new-style one.

isinstance() works as well with classic classes.


From mail at timgolden.me.uk  Fri Feb 13 03:39:01 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 13 Feb 2009 08:39:01 +0000
Subject: Invoking CutePDF from within Python
In-Reply-To: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
Message-ID: <499531A5.5010805@timgolden.me.uk>

John Henry wrote:
> I have a need to invoke CutePDF from within a Python program.  
> 
> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".

> Private Sub Print_PDF()
> 
>      lRetVal = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\Custom PDF
> Printer",  _
>                     0&, vbNullString, REG_OPTION_NON_VOLATILE,
> KEY_ALL_ACCESS, _
>                     0&, hKey, lRetVal)
>      sValue = "C:\Sample.pdf"
>      RegSetValueExString hKey, "OutputFile", 0&, REG_SZ, sValue, Len
> (sValue)
>      sValue = "1"
>      RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
> (sValue)
> 
>      Dim worddoc As Word.Document
>      Set worddoc = wordapp.Documents.Open("C:\Sample.doc")
>      wordapp.ActivePrinter = "Custom PDF Printer"
>      wordapp.PrintOut
>      worddoc.Close
> 
>      sValue = "0"
>      RegSetValueExString hKey, "BypassSaveAs", 0&, REG_SZ, sValue, Len
> (sValue)
>      RegCloseKey (hKey)


Direct translation (untested since I don't have CutePDF installed)

<code>
import win32api
import win32con
import win32com

hKey, ret = win32api.RegCreateKeyEx (
  win32con.HKEY_CURRENT_USER, 
  "Software\Custom PDF Printer",
  win32con.KEY_ALL_ACCESS
)
win32api.RegSetValueEx (hKey, "OutputFile", None, win32con.REG_SZ, r"c:\sample.pdf")
win32api.RegSetValueEx (hKey, "BypassSaveAs", None, win32con.REG_SZ, r"1")

word = win32com.client.gencache.EnsureDispatch ("Word.Application")
doc = word.Documents.Open (r"c:\sample.doc")
doc.ActivePrinter = "Custom PDF Printer"
word.Printout ()
doc.Close ()

win32api.RegSetValueEx (hKey, "BypassSaveAs", None, win32con.REG_SZ, r"0")

</code>


FWIW, I usually generate PDFs by printing to a Postscript printer
(some random Apple Laserthingy) and then using Ghostscript to
do the conversion. I'm happy to post if you're interested.

TJG




From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 03:50:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 09:50:15 +0100
Subject: something wrong with isinstance
In-Reply-To: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
Message-ID: <4995343c$0$4817$426a74cc@news.free.fr>

maksym.kaban at gmail.com a ?crit :
> Hi there.
> now i'm a complete newbie for python, and maybe my problem is stupid
> but i cannot solve it myself
> 

Others already addressed your problem (cf Paul and Diez answers). I'll 
just allow myself to point a couple other potential problems with your code:

> ##worldmap module
> class GeoMap:
>     cells = []
>     activerow = 0
>     activecol = 0


Attributes defined at the class level are *class* attributes, shared by 
all instances of the class - that is, all instances will access the one 
same 'cells' list. Instance attributes are canonically created in the 
initialize method (__init__) that is automagically called on 
instanciation. IOW, you want to replace the above lines with:

      def __init__(self):
          self.cells = []
          self.activerow = 0
          self.activecol = 0


>     def addCell(self, acell):
>         if len(self.cells) == 0:

An empty list evals to False in a boolean context, so the above can be 
simply expressed as:
           if not self.cells:

>           self.cells.append([])
>           self.activerow = 0
>         acell.col = self.activerow
>         acell.row = self.activecol
>         self.cells[self.activerow].append(acell)
>         self.activecol += 1
> 
>     def addRow(self):
>         self.cells.append([])
>         self.activerow += 1;
>         self.activecol = 0;
> 
> class GeoMapCell:
>     neighbours = (None, None, None, None, None, None, )
>     col = 0
>     row = 0

Same remark as above. You want to move all this code to the __init__ method.



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 13 04:10:34 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 13 Feb 2009 10:10:34 +0100
Subject: Problem with objects copying each other in memory
In-Reply-To: <mailman.9448.1234477815.3487.python-list@python.org>
References: <8f4a72d2-6fb1-484a-99ef-81b4a5918997@f20g2000yqg.googlegroups.com>	<6033c55d3f76cd47dbe4cbb627d016c3.squirrel@acooke.dyndns.org>
	<mailman.9448.1234477815.3487.python-list@python.org>
Message-ID: <499538ff$0$4837$426a34cc@news.free.fr>

Cameron Pulsford a ?crit :

> Thanks, that did it! Why is that the case though? Or rather, why do the 
> assignments to temp.x and temp.y not effect the self.x and self.y? How 
> come I only run into the problem with the list?


Because there's a huge difference between binding an object to a name 
and mutating an object ?

First point: Python's "assignment"  is really a binding of a name and an 
object _reference_ in a given namespace. Think of namespaces as 
name=>object_ref dictionnaries. This implies that "assignement" never 
copies anything. So when you do:

 >>> list1 = []
 >>> list2 = list1

the second line actually creates *another* name=>object pair referencing 
the *same* list object. IOW, list1 and list2 are two named references to 
a single object:

  >>> list1 is list2
True
 >>> id(list1) == id(list2)
True

So whether you access it thru name 'list1' or 'list2', if you mutate the 
object (like append/remove/replace an element of the list), you'll see 
the result thru the other name as well:

 >>> list1.append('foo')
 >>> list2.append('bar')
 >>> list1
['foo', 'bar']
 >>> list2
['foo', 'bar']
 >>>

Note FWIW that list subscripting (somelist[x] = y) is really a method 
call (somelist.__setitem__(x, y)) in disguise, so the same reasonning 
applies.

Now *rebinding* a name is a different thing. It makes the name refer to 
another object, but has no impact on other name=>object bindings 
refering to the previously bound object, ie:

 >>> list2 = ['hou', 'lala']

Now list2 points to a newly created list object. This doesn't impact 
list1 of course:

 >>> list1
['foo', 'bar']
 >>> list1 is list2
False
 >>> id(list1) == id(list2)
False
 >>>


(snip)


From martijnsteenwijk at gmail.com  Fri Feb 13 04:30:48 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Fri, 13 Feb 2009 01:30:48 -0800 (PST)
Subject: Problem building Python extension
Message-ID: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>

Hi all,

I'm trying to build my first python extensionon a win32 system. I
followed the description in http://starship.python.net/crew/mwh/toext/your-first-extension.html,
but after running

C:\Python26\python first-setup.py build_ext -i

nothing seems to happen and no file first.pyd is produced.

The result from the cmd is the following:
running build_ext
building `first` extension
error: None

Does anyone have an idea what's going wrong?

Thanks for replies in advance,
Martijn


From marco at sferacarta.com  Fri Feb 13 04:49:53 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 13 Feb 2009 10:49:53 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
Message-ID: <5nbll.29481$8Z.20616@tornado.fastwebnet.it>

azrael wrote:

> I know that there is already a standard python library, But
> why not extending it. classify the standard library into subcategories
> like Networking, DataBase, Computation, ......

If the standard library where that huge, python 3.0 would have been late 
by a couple of years.

> Why not using this number of people and accomplish something great. If
> anyone of us would write 10 line of good code, it would result a very
> great and powerfull environment.

I totally want to write my 10 lines of great image processing or speech 
recognition software, but it's not how development works.


From cournape at gmail.com  Fri Feb 13 04:53:30 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 18:53:30 +0900
Subject: Problem building Python extension
In-Reply-To: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
Message-ID: <5b8d13220902130153k9b119m5b58088350b87dba@mail.gmail.com>

On Fri, Feb 13, 2009 at 6:30 PM,  <martijnsteenwijk at gmail.com> wrote:
> Hi all,
>
> I'm trying to build my first python extensionon a win32 system. I
> followed the description in http://starship.python.net/crew/mwh/toext/your-first-extension.html,
> but after running
>
> C:\Python26\python first-setup.py build_ext -i
>
> nothing seems to happen and no file first.pyd is produced.
>
> The result from the cmd is the following:
> running build_ext
> building `first` extension
> error: None

It is a bug in distutils - you reminded me that I did not report it :)
. IIRC, it is caused by the lack of a recognized installation VS 2008.
You should either install VS 2008 (the express vesion is free) or make
sure your VS 2008 is correctly installed.

Building python 2.6 extensions with mingw is possible as well, but I
think you need to build your own mingw (because python 2.6 requires
msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.

cheers,

David


From pavlovevidence at gmail.com  Fri Feb 13 05:07:58 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 13 Feb 2009 02:07:58 -0800 (PST)
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
Message-ID: <ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>

On Feb 12, 10:49?am, redbaron <ivanov.ma... at gmail.com> wrote:
> Don't really sure, but try to define your class as new-style one.
> Like
> class GeoMap(object):
> ? ?...

Well, the OP said he was using Python 3.0, where all classes are new-
style classes.

But that brings up another very slight possibility, though not a very
likely one in this case: the behavior of isinstance can be
customized.  It can happen unbeknownst to a user who subclasses a
class that does that.


Carl Banks


From s.selvamsiva at gmail.com  Fri Feb 13 05:16:00 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Fri, 13 Feb 2009 15:46:00 +0530
Subject: Levenshtein word comparison -performance issue
Message-ID: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>

Hi all,

I need some help.
I tried to find top n(eg. 5) similar words for a given word, from a
dictionary of 50,000 words.
I used python-levenshtein module,and sample code is as follow.

def foo(searchword):
    disdict={}
    for word in self.dictionary-words:
                   distance=Levenshtein.ratio(searchword,word)
                   disdict[word]=distance
    """
     sort the disdict dictionary by values in descending order
    """
    similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)

    return similarwords[:5]

foo() takes a search word and compares it with dictionary of 50,000 and
assigns each word a value(lies between 0 to 1).
Then after sorting in descending order it returns top 5 similar words.

The problem is, it* takes long time* for processing(as i need to pass more
search words within a loop),i guess the code could be improved to work
efficiently.Your suggestions are welcome...
-- 
Yours,
S.Selvam
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From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:16:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:16:47 -0200
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<mailman.9474.1234508570.3487.python-list@python.org>
	<a158ea7e-0ab9-4dae-a217-7004859f13e9@m16g2000vbp.googlegroups.com>
Message-ID: <op.upab590jx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 05:43:02 -0200, brianrpsgt1 <brianlong at cox.net>  
escribi?:

> On Feb 12, 11:02?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Fri, 13 Feb 2009 04:44:54 -0200, brianrpsgt1 <brianl... at cox.net> ?
>> escribi?:
>>
>> > New to python.... I have a large file that I need to break upinto
>> > multiple smallerfiles. I need to break the large fileintosections
>> > where there are 65535 lines and then write thosesectionsto seperate
>> >files. ?I am familiar with opening and writingfiles, however, I am
>> > struggling with creating thesectionsand writing the different
>> >sectionsto their ownfiles.
>>
>> This function copies at most n lines from fin to fout:
>>
>> def copylines(fin, fout, n):
>> ? ?for i, line in enumerate(fin):
>> ? ? ?fout.write(line)
>> ? ? ?if i+1>=n: break
>>
>> Now you have to open the source file, create newfilesas needed and ?
>> repeatedly call the above function until the end of source file. You'll  
>> ?
>> have to enhace it bit, to know whether there are remaining lines or not.
>>
>> --
>> Gabriel Genellina
>
> Gabriel ::
>
> Thanks for the direction.  Do I simply define fin, fout and n as
> variables above the def copylines(fin, fout, n): line?
>
> Would it look like this?
>
> fin = open('C:\Path\file')
> fout = 'C:\newfile.csv')
> n = 65535

Warning: see this FAQ entry  
http://www.python.org/doc/faq/general/#why-can-t-raw-strings-r-strings-end-with-a-backslash
>
> def copylines(fin, fout, n):
>     for i, line in enumerate(fin):
>  ? ? ?fout.write(line)
>  ? ? ?if i+1>=n: break

Almost. You have to *call* the copylines function, not just define it.  
After calling it with: copylines(fin, fout, 65535), you'll have the  
*first* chunk of lines copied. So you'll need to create a second file,  
call the copylines function again, create a third file, call... You'll  
need some kind of loop, and a way to detect when to stop and break out of  
it.

The copylines function already knows what happened (whether there are more  
lines to copy or not) so you should enhace it and return such information  
to the caller.

It isn't so hard, after working out the tutorial (linked from  
http://wiki.python.org/moin/BeginnersGuide ) you'll know enough Python to  
finish this program.

If you have some previous programming experience, Dive into Python (linked  
 from the Beginners Guide above) is a good online book.

Feel free to come back when you're stuck with something.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:27:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:27:35 -0200
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
Message-ID: <op.upacn9zjx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks <pavlovevidence at gmail.com>  
escribi?:

> Well, the OP said he was using Python 3.0, where all classes are new-
> style classes.
>
> But that brings up another very slight possibility, though not a very
> likely one in this case: the behavior of isinstance can be
> customized.  It can happen unbeknownst to a user who subclasses a
> class that does that.

Really? I didn't know that -- how do you do that?

-- 
Gabriel Genellina



From pavlovevidence at gmail.com  Fri Feb 13 05:36:05 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 13 Feb 2009 02:36:05 -0800 (PST)
Subject: thread. question
References: <1234187238.7630.34.camel@tim-laptop> <gmpgbp$60o$1@ger.gmane.org>
	<mailman.9156.1234193645.3487.python-list@python.org>
Message-ID: <dc9c7a38-69d5-4d51-a4b2-e012f7a67971@u18g2000pro.googlegroups.com>

On Feb 9, 7:34?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> Thanks for both replies,
>
> On Mon, 2009-02-09 at 15:59 +0100, Christian Heimes wrote:
> > You shouldn't use the thread module directly. It's not meant to be used
> > by a user. Please stick to the threading module. You won't notice a
> > slowdown, trust me :)
>
> I'm aware that thread is being renamed to _thread in python 3.0, but is
> it being depricated or anything like that?
>
> This is for an app that has been running for quite a long time and it's
> now time for fairly heavy optimisations as load is increasing (Believe
> me, I wouldn't have been looking at the C otherwise) - so I'll see if I
> do notice any effect with threading.

The threading module is likely to be slightly slower when spawning new
threads, because the Thread class has a bit of overhead that allows
you to do things like thread.join().

Simple locking will be same speed whether you use the threading or
thread module, because threading.Lock and thread.acquire return the
same type of object.  This is an implementation detail, though.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:42:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:42:19 -0200
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
Message-ID: <op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>  
escribi?:

> I need some help.
> I tried to find top n(eg. 5) similar words for a given word, from a
> dictionary of 50,000 words.
> I used python-levenshtein module,and sample code is as follow.
>
> def foo(searchword):
>     disdict={}
>     for word in self.dictionary-words:
>                    distance=Levenshtein.ratio(searchword,word)
>                    disdict[word]=distance
>     """
>      sort the disdict dictionary by values in descending order
>     """
>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>
>     return similarwords[:5]

You may replace the last steps (sort + slice top 5) by heapq.nlargest - at  
least you won't waste time sorting 49995 irrelevant words...
Anyway you should measure the time taken by the first part (Levenshtein),  
it may be the most demanding. I think there is a C extension for this,  
should be much faster than pure Python calculations.

-- 
Gabriel Genellina



From __peter__ at web.de  Fri Feb 13 05:43:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Fri, 13 Feb 2009 11:43:03 +0100
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
	<mailman.9481.1234520852.3487.python-list@python.org>
Message-ID: <gn3irc$mss$02$1@news.t-online.com>

Gabriel Genellina wrote:

> En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks <pavlovevidence at gmail.com>
> escribi?:
> 
>> Well, the OP said he was using Python 3.0, where all classes are new-
>> style classes.
>>
>> But that brings up another very slight possibility, though not a very
>> likely one in this case: the behavior of isinstance can be
>> customized.  It can happen unbeknownst to a user who subclasses a
>> class that does that.
> 
> Really? I didn't know that -- how do you do that?
 
>>> class Type(type):
...     def __instancecheck__(self, other): return True
...
>>> class A(metaclass=Type): pass
...
>>> class B: pass
...
>>> isinstance(B(), A)
True

See also 

http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass

I doubt that this is the source of the OP's troubles, though.

Peter


From martijnsteenwijk at gmail.com  Fri Feb 13 05:58:29 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Fri, 13 Feb 2009 02:58:29 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
Message-ID: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>

On 13 feb, 10:53, David Cournapeau <courn... at gmail.com> wrote:
> On Fri, Feb 13, 2009 at 6:30 PM, ?<martijnsteenw... at gmail.com> wrote:
> > Hi all,
>
> > I'm trying to build my first python extensionon a win32 system. I
> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
> > but after running
>
> > C:\Python26\python first-setup.py build_ext -i
>
> > nothing seems to happen and no file first.pyd is produced.
>
> > The result from the cmd is the following:
> > running build_ext
> > building `first` extension
> > error: None
>
> It is a bug in distutils - you reminded me that I did not report it :)
> . IIRC, it is caused by the lack of a recognized installation VS 2008.
> You should either install VS 2008 (the express vesion is free) or make
> sure your VS 2008 is correctly installed.
>
> Building python 2.6 extensions with mingw is possible as well, but I
> think you need to build your own mingw (because python 2.6 requires
> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>
> cheers,
>
> David

Thanks a lot for your reply. I downloaded & installed Visual C# 2008
express, but unfortunately this doesn't change anything in running the
setup file. Unfortunately, still no pyd file is produced...

Did I something wrong?


From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:58:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:58:41 -0200
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org>
	<4994FA84.5070806@rksystems.com>
Message-ID: <op.upad330lx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 02:43:48 -0200, Bob Kline <bkline at rksystems.com>  
escribi?:
> Joshua Kugler wrote:
>>> We just upgraded Python to 2.6 on some of our servers and a number of  
>>> our
>>> CGI scripts broke because the cgi module has changed the way it handles
>>> POST requests.  When the 'action' attribute was not present in the  
>>> form element on an HTML page the module behaved as if the value of the
>>> attribute was the URL which brought the user to the page with the form,
>>> but without the query (?x=y...) part.

> [1] I haven't yet finished my attempts to parse the relevant RFCs; I  
> assumed that the original authors and maintainers of this module (which  
> includes the BDFL himself), would have been more adept at that than I  
> am, which is one of the reasons I was hoping to find some discussion in  
> the mailing list archives of the discussion of the proposed change in  
> the module's behavior.

I noticed this change in behaviour too, and indeed, it is due to  
http://bugs.python.org/issue1817
But I could not find any RFC/standard/reccomendation/whatever that clearly  
states *what* should happen with a POST request directed to an URI having  
a query string itself. So I could not say "it's a bug" -- it's just...  
annoying in these cases (although it might be useful in some other cases,  
I think)
A posible workaround is to ensure all forms have an action attribute, and  
that it doesn't contain any query string.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Feb 13 05:59:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 13 Feb 2009 08:59:01 -0200
Subject: something wrong with isinstance
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>
	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>
	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>
	<mailman.9481.1234520852.3487.python-list@python.org>
	<gn3irc$mss$02$1@news.t-online.com>
Message-ID: <op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>

En Fri, 13 Feb 2009 08:43:03 -0200, Peter Otten <__peter__ at web.de>  
escribi?:
> Gabriel Genellina wrote:
>> En Fri, 13 Feb 2009 08:07:58 -0200, Carl Banks  
>> <pavlovevidence at gmail.com>
>> escribi?:
>>> But that brings up another very slight possibility, though not a very
>>> likely one in this case: the behavior of isinstance can be
>>> customized.  It can happen unbeknownst to a user who subclasses a
>>> class that does that.
>>
>> Really? I didn't know that -- how do you do that?
>
>>>> class Type(type):
> ...     def __instancecheck__(self, other): return True
> ...
>>>> class A(metaclass=Type): pass
> ...
>>>> class B: pass
> ...
>>>> isinstance(B(), A)
> True
>
> See also
>
> http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass

Ah, ok. Isn't menctioned in the main documentation though.

-- 
Gabriel Genellina



From greg.ewing at canterbury.ac.nz  Fri Feb 13 06:11:02 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sat, 14 Feb 2009 00:11:02 +1300
Subject: ANN: Supy 1.1
Message-ID: <mailman.9496.1234537239.3487.python-announce-list@python.org>

SuPy 1.1 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Added explicit ways of calling method names ending in '?' or '!'. Python
method names 'is_xxx' and 'xxx_ip' map to Ruby 'xxx?' and 'xxx!' respectively.
The plain name 'xxx' can still be used where there is no ambiguity.

- Ruby true and false are now converted to Python True and False.

- Ruby methods expecting a block can be called from Python by passing
a callable Python object with the keyword 'body'.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From notvalid2 at sbcglobal.net  Fri Feb 13 06:13:38 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 03:13:38 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9470.1234502626.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
Message-ID: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>

Terry Reedy wrote:
> W. eWatson wrote:
>>  From Diez above.
>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>> run it
>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>> pyhton-file your app is in. That's all that there is to it.
>>
>> So this is the absolute truth? No wiggle room? One can never use a 
>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>> doesn't issue a standard warning that says, "Get out of here with your 
>> Tkinter program, it will fail when you try to run it here. You have 
>> entered Tkinter hell. Good-bye."
> 
> Re-read my post about kids fighting to control a television.  Maybe they 
> work together, maybe they crash the TV.  Hard to predict.
> 
> ***ANY*** Python program that tries to grab and control the same 
> resources that TK does may conflict with it.  There is no way that IDLE 
> can have a list of, for instance, all event-grabbing mainloop programs.
> 
OK, enough tinkering with the code and others matters on my end trying to 
find a work around. Somehow after much successful use of IDLE's execution 
facility, I've stepped on an invisible banana peel. I think it's evident 
that I'm not going around this problem easily with the IDLE execution 
attempts, and that another solution is required.

First, I think somewhere up the thread someone suggested that Active 
pythonWin is not dependent upon Tk, correct? Therefore, it is immune from 
such problems, correct?

Second, maybe I missed it above, but when I posted the output from the 
program that showed the failure, was there anything that said, "IDLE 
problem" or would even give a clue that's the culprit?

Finally, we can probably agree that I can continue to use IDLE for editing 
and syntax checking, but to "guarantee" successful execution of the program, 
I can just double-click on the py file in my folder. Perhaps there is a 
better way than clicking on it in the folder. For example, putting it on the 
desktop. As I look at the folder, previous copies only differ by a digit, I 
can easily find myself executing an earlier version, differing as Dev4, to 
Dev5 at the end of each name.

Let me ask this. When I install Active Python, am I getting something beyond 
their interface? That is, does executing the code there result in using the 
same python interpreter that is used by IDLE? My use of their editor has 
been somewhat exasperating. It does not seem as friendly as the IDLE editor.

I still find it bizarre that the original creator of this program can spend 
months using IDLE to develop this program, and that I've spent maybe 10 days 
recently now adding to it without having much, if any, problem with IDLE and 
the programs execution within IDLE. I asked him almost a year ago what tool 
he used. IDLE, was the reply. Maybe it was really IDLE with no execution 
from inside IDLE. I'll ask him.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From cournape at gmail.com  Fri Feb 13 06:15:03 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 13 Feb 2009 20:15:03 +0900
Subject: Problem building Python extension
In-Reply-To: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
Message-ID: <5b8d13220902130315m433f25day88e9df65c24d9f66@mail.gmail.com>

On Fri, Feb 13, 2009 at 7:58 PM,  <martijnsteenwijk at gmail.com> wrote:
> On 13 feb, 10:53, David Cournapeau <courn... at gmail.com> wrote:
>> On Fri, Feb 13, 2009 at 6:30 PM,  <martijnsteenw... at gmail.com> wrote:
>> > Hi all,
>>
>> > I'm trying to build my first python extensionon a win32 system. I
>> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
>> > but after running
>>
>> > C:\Python26\python first-setup.py build_ext -i
>>
>> > nothing seems to happen and no file first.pyd is produced.
>>
>> > The result from the cmd is the following:
>> > running build_ext
>> > building `first` extension
>> > error: None
>>
>> It is a bug in distutils - you reminded me that I did not report it :)
>> . IIRC, it is caused by the lack of a recognized installation VS 2008.
>> You should either install VS 2008 (the express vesion is free) or make
>> sure your VS 2008 is correctly installed.
>>
>> Building python 2.6 extensions with mingw is possible as well, but I
>> think you need to build your own mingw (because python 2.6 requires
>> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>>
>> cheers,
>>
>> David
>
> Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> express, but unfortunately this doesn't change anything in running the
> setup file. Unfortunately, still no pyd file is produced...

I am not 100 % confident, but I think the problem is that for Visual
Studio express, you need to build the extension in a Visual Studio
shell (in the VS 2008 express menu). If that still does not work, I
will check on a windows VM (I need to do the bug report anyway).

cheers,

David


From carlos.mora at atisa.es  Fri Feb 13 06:15:13 2009
From: carlos.mora at atisa.es (cm)
Date: Fri, 13 Feb 2009 12:15:13 +0100
Subject: Invoking CutePDF from within Python
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
Message-ID: <gn3knj$34a$1@aioe.org>

Hi John,
> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".
I can't answer you question but let me make a suggestion: Try 
PdfCreator. It lets you control all the process using an activex 
control. It has events to tell you when the jobs has finish, or report 
you of eventual errors.

Download it from sf.net, and look into the samples.

Best regards,

Carlos.


From cwitts at gmail.com  Fri Feb 13 06:19:52 2009
From: cwitts at gmail.com (Chris)
Date: Fri, 13 Feb 2009 03:19:52 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com>
Message-ID: <61a8c5b2-9b81-4b51-a2c3-f9e43b01586f@m42g2000yqb.googlegroups.com>

On Feb 13, 10:02?am, redbaron <ivanov.ma... at gmail.com> wrote:
> > New to python.... I have a large file that I need to break up into
> > multiple smaller files. I need to break the large file into sections
> > where there are 65535 lines and then write those sections to seperate
> > files.
>
> If your lines are variable-length, then look at itertools recipes.
>
> from itertools import izip_longest
>
> def grouper(n, iterable, fillvalue=None):
> ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> ? ? args = [iter(iterable)] * n
> ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> with open("/file","r") as f:
> ? ? for lines in grouper(65535,f,""):
> ? ? ? ? data_to_write = '\n'.join(lines).rstrip("\n")
> ? ? ? ? ...
> ? ? ? ? <write data where you need it here>
> ? ? ? ? ...

I really would not recommend joining a large about of lines, that will
take some times.

fIn = open(input_filename, 'rb')
chunk_size = 65535

for i,line in enumerate(fIn):
    if not i:   # First Line in the File, create a file to start
writing to
        filenum = '%04d'%(i%chunk_size)+1
        fOut = open('%s.txt'%filenum, 'wb')
    if i and not i % chunk_size:   # Once at the chunk_size close the
old file object and create a new one
        fOut.close()
        filenum = '%04d'%(i%chunk_size)+1
        fOut = open('%s.txt'%filenum, 'wb')
    if not i % 1000:
        fOut.flush()
    fOut.write(line)

fOut.close()
fIn.close()


From cwitts at gmail.com  Fri Feb 13 06:36:11 2009
From: cwitts at gmail.com (Chris)
Date: Fri, 13 Feb 2009 03:36:11 -0800 (PST)
Subject: Break large file down into multiple files
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
	<3ee93344-685b-42e6-9fd8-f07843a0b667@k19g2000yqg.googlegroups.com> 
	<61a8c5b2-9b81-4b51-a2c3-f9e43b01586f@m42g2000yqb.googlegroups.com>
Message-ID: <fa879417-a68e-4c03-9d96-f03a21d84b12@t11g2000yqg.googlegroups.com>

On Feb 13, 1:19?pm, Chris <cwi... at gmail.com> wrote:
> On Feb 13, 10:02?am, redbaron <ivanov.ma... at gmail.com> wrote:
>
>
>
> > > New to python.... I have a large file that I need to break up into
> > > multiple smaller files. I need to break the large file into sections
> > > where there are 65535 lines and then write those sections to seperate
> > > files.
>
> > If your lines are variable-length, then look at itertools recipes.
>
> > from itertools import izip_longest
>
> > def grouper(n, iterable, fillvalue=None):
> > ? ? "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> > ? ? args = [iter(iterable)] * n
> > ? ? return izip_longest(fillvalue=fillvalue, *args)
>
> > with open("/file","r") as f:
> > ? ? for lines in grouper(65535,f,""):
> > ? ? ? ? data_to_write = '\n'.join(lines).rstrip("\n")
> > ? ? ? ? ...
> > ? ? ? ? <write data where you need it here>
> > ? ? ? ? ...
>
> I really would not recommend joining a large about of lines, that will
> take some times.
>
> fIn = open(input_filename, 'rb')
> chunk_size = 65535
>
> for i,line in enumerate(fIn):
> ? ? if not i: ? # First Line in the File, create a file to start
> writing to
> ? ? ? ? filenum = '%04d'%(i%chunk_size)+1
> ? ? ? ? fOut = open('%s.txt'%filenum, 'wb')
> ? ? if i and not i % chunk_size: ? # Once at the chunk_size close the
> old file object and create a new one
> ? ? ? ? fOut.close()
> ? ? ? ? filenum = '%04d'%(i%chunk_size)+1
> ? ? ? ? fOut = open('%s.txt'%filenum, 'wb')
> ? ? if not i % 1000:
> ? ? ? ? fOut.flush()
> ? ? fOut.write(line)
>
> fOut.close()
> fIn.close()

Whoops, day-dreaming mistake.  Use "filenum = '%04d'%(i/chunk_size)+1"
and not i%chunk_size.


From python.list at tim.thechases.com  Fri Feb 13 06:38:06 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 13 Feb 2009 05:38:06 -0600
Subject: Break large file down into multiple files
In-Reply-To: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
References: <aba97391-8eec-435f-855b-9e31255bd16c@41g2000yqf.googlegroups.com>
Message-ID: <49955B9E.2070209@tim.thechases.com>

> New to python.... I have a large file that I need to break up
> into multiple smaller files. I need to break the large file
> into sections where there are 65535 lines and then write those
> sections to seperate files.  I am familiar with opening and
> writing files, however, I am struggling with creating the
> sections and writing the different sections to their own
> files.

While this thread has offered many nice Python solutions, the 
"split" command is pretty standard on most Linux boxes:

   bash$ split -l 65535 infile.txt

which will do what you describe.  You can read the man page for 
more details.

So if you just want a fast route to a goal rather than going 
through the learning process (I'm all for learning how to do it 
too), this may be a quick answer.

-tkc





From lists at cheimes.de  Fri Feb 13 06:45:30 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 13 Feb 2009 12:45:30 +0100
Subject: Problem building Python extension
In-Reply-To: <fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
Message-ID: <gn3mgq$sme$1@ger.gmane.org>

martijnsteenwijk at gmail.com wrote:
> Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> express, but unfortunately this doesn't change anything in running the
> setup file. Unfortunately, still no pyd file is produced...
> 
> Did I something wrong?

Yeah, you installed the C# environment. Python is written in C, so you
have to get Visual Studio C++ 2008. However a recent version of MinGW32
is sufficient to build most extensions.

Christian



From juergen.riemer at gmail.com  Fri Feb 13 06:49:05 2009
From: juergen.riemer at gmail.com (JuergenRiemer)
Date: Fri, 13 Feb 2009 03:49:05 -0800 (PST)
Subject: get wget log message
Message-ID: <6eb958bd-3d9b-4388-99c0-944268914be1@x10g2000yqk.googlegroups.com>

Hi,

I didn't succeed to do the following:
I download a PDF file via wget yet I am not interested in the file
itself but the wget verbose output (log message) e.g. download speed,
total size, etc.
I know I could use < -o log.txt > and then read from that file yet
this seems not very elegant.
I am new to both wget/linux and python and am struggling for quite
some time now, could anyone help me here?

 thx a lot
 Juergen



From gnewsg at gmail.com  Fri Feb 13 07:00:17 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 13 Feb 2009 04:00:17 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
Message-ID: <d2bb736e-46ee-489a-a770-38683d76dc91@m40g2000yqh.googlegroups.com>

On Feb 13, 10:53?am, David Cournapeau <courn... at gmail.com> wrote:
> On Fri, Feb 13, 2009 at 6:30 PM, ?<martijnsteenw... at gmail.com> wrote:
> > Hi all,
>
> > I'm trying to build my first python extensionon a win32 system. I
> > followed the description inhttp://starship.python.net/crew/mwh/toext/your-first-extension.html,
> > but after running
>
> > C:\Python26\python first-setup.py build_ext -i
>
> > nothing seems to happen and no file first.pyd is produced.
>
> > The result from the cmd is the following:
> > running build_ext
> > building `first` extension
> > error: None
>
> It is a bug in distutils - you reminded me that I did not report it :)
> . IIRC, it is caused by the lack of a recognized installation VS 2008.
> You should either install VS 2008 (the express vesion is free) or make
> sure your VS 2008 is correctly installed.
>
> Building python 2.6 extensions with mingw is possible as well, but I
> think you need to build your own mingw (because python 2.6 requires
> msvcr90.dll) - maybe recent mingw have msvcrt90.dll included.
>
> cheers,
>
> David

I already reported that:
http://bugs.python.org/issue4931


--- Giampaolo
http://code.google.com/p/pyftpdlib


From juergen.riemer at gmail.com  Fri Feb 13 07:02:37 2009
From: juergen.riemer at gmail.com (JuergenRiemer)
Date: Fri, 13 Feb 2009 04:02:37 -0800 (PST)
Subject: get wget log message
References: <6eb958bd-3d9b-4388-99c0-944268914be1@x10g2000yqk.googlegroups.com>
Message-ID: <ba79e7dc-cddb-4b7b-9719-fe646ca2b8dc@h16g2000yqj.googlegroups.com>

> itself but the wget verbose output (log message) e.g. download speed,
> total size, etc.

ahh I got it 1 minute after sending this post grrrr

commands.getstatusoutput(cmd)

Juergen


From paul at boddie.org.uk  Fri Feb 13 07:03:44 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Fri, 13 Feb 2009 04:03:44 -0800 (PST)
Subject: Change in cgi module's handling of POST requests
References: <4991E16F.3010407@rksystems.com> <gn23u8$q09$1@ger.gmane.org> 
	<4994FA84.5070806@rksystems.com>
	<mailman.9483.1234522720.3487.python-list@python.org>
Message-ID: <9436b83e-5283-466a-a1d9-0822bcca37e7@h20g2000yqn.googlegroups.com>

On 13 Feb, 11:58, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
> I noticed this change in behaviour too, and indeed, it is due to ?http://bugs.python.org/issue1817
> But I could not find any RFC/standard/reccomendation/whatever that clearly ?
> states *what* should happen with a POST request directed to an URI having ?
> a query string itself. So I could not say "it's a bug" -- it's just... ?
> annoying in these cases (although it might be useful in some other cases, ?
> I think)

The issue of distinguishing between query-originating parameters and
form-originating parameters has been around for a very long time, and
in my own work, especially where the cgi module has been used, I've
been careful to distinguish between the two types and to merge them
only if this is desired (get_fields vs. get_fields_from_path and
get_fields_from_body in WebStack). If the cgi module has now changed
its behaviour to just merge the two data sources, I can imagine that a
few applications aren't going to be happy any more, and since I doubt
that I'm the only one to take the approach I've just described, I can
imagine that I'm not alone in regarding this "bug fix" as more of a
regression if it has been done in a way which does not preserve the
behaviour of unmodified existing code.

Paul


From martin at marcher.name  Fri Feb 13 07:08:02 2009
From: martin at marcher.name (Martin)
Date: Fri, 13 Feb 2009 13:08:02 +0100
Subject: A little bit else I would like to discuss
In-Reply-To: <gn26k5$3ak$1@ger.gmane.org>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<5fa6c12e0902121336w6716187awc9495f852791988d@mail.gmail.com>
	<gn26k5$3ak$1@ger.gmane.org>
Message-ID: <5fa6c12e0902130408k2bf075f0x138ffcd93b1df92b@mail.gmail.com>

2009/2/12 Christian Heimes <lists at cheimes.de>:
> Martin wrote:
> [typos igored as requested ;)]
>
>> How does "small and agile" work with "batteries included"?
>
> The Python slogan says "batteries included", not "fusion reactor included".

I'd be fine with a fusion reactor, my objections would be if skynet
was included :)

> The rules are:
>
> ...
>
> It takes at least 1.5 years to get a new feature into an extension and
> at least 3 years to remove or change a feature. That's a major shop
> stopper for every fast moving piece of Python software.

True, I thought a bit more about it and decided for myself to be happy
with the way it is since I prefer quality to features :)


/Martin




-- 
http://soup.alt.delete.co.at
http://www.xing.com/profile/Martin_Marcher
http://www.linkedin.com/in/martinmarcher

You are not free to read this message,
by doing so, you have violated my licence
and are required to urinate publicly. Thank you.

Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html


From google at mrabarnett.plus.com  Fri Feb 13 07:25:24 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 12:25:24 +0000
Subject: NNTPlib encoding issue
In-Reply-To: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>
References: <6f905a64-abeb-4dba-992c-8dc6aad7326c@33g2000yqm.googlegroups.com>
Message-ID: <499566B4.8080608@mrabarnett.plus.com>

mohit_ranka wrote:
> I am getting unknown encoding like, "=?Utf-8?B?QWRyaWFu?=
> <Adrian at discussions.microsoft.com>" (quotes for clarity) for name of
> the author from nntplib module. which seems like an encoding issue
> with NNTPLib module.
> 
> What should i do to get author name information in human readable
> format.
> 
The original text was encoded in UTF-8 and then into base-64:

=?Utf-8?B?QWRyaWFu?=
   ^^^^^ UTF-8

=?Utf-8?B?QWRyaWFu?=
         ^ Base-64

So that's:

 >>> "QWRyaWFu".decode("base-64").decode("Utf-8")
u'Adrian'


From gideon.smeding at gmail.com  Fri Feb 13 08:13:09 2009
From: gideon.smeding at gmail.com (gideon)
Date: Fri, 13 Feb 2009 05:13:09 -0800 (PST)
Subject: An executable operational semantics for Python
References: <01cf8180-87e2-472a-9891-eb687fdd5e6c@j8g2000yql.googlegroups.com>
	<b11993c2-b37d-4cb0-9e2c-018c70532671@t3g2000yqa.googlegroups.com>
Message-ID: <c8e6cac0-0d57-4fe7-95c7-1e83ba97f337@f20g2000yqg.googlegroups.com>

On Feb 12, 5:14?pm, bearophileH... at lycos.com wrote:
> gideon:
>
> > I've recently finished my Master's thesis on the semantics of Python.
> > In my thesis I define the semantics of Python by rewriting an abstract
> > machine. The sources that are used to produce my thesis can also be
> > compiled into a working interpreter. Hence I call it an 'executable'
> >semantics.
>
> Can it be used for some useful purpose?

The interpreter? Probably not. The semantics. Yes.


From berend at dotmpe.com  Fri Feb 13 08:58:03 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Fri, 13 Feb 2009 14:58:03 +0100
Subject: sgmllib parser keeps old tag data?
Message-ID: <20090213135803.GB2168@iris.furrow.ath.cx>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Hi everyone,

I read the source, made numerous tests, but SGMLParser's keeps returning *tag* data 
from previous parser instances. I'm totally confused why.. The content data it
returns is ok.

E.g.::

    sp = MyParser()
    sp.feed('<test><t />Test</test>')
    print sp.content, sp.markup
    sp.close()

    sp = MyParser()
    sp.feed('<xml>\n</xml>\r\n')
    print sp.content, sp.markup
    sp.close()

gives::

    ('Test', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}]) 
    ('\n\r\n', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}, {'xml': ({}, (0, 1))}])

It keeps the tags from the previous session, while i'm sure the stack etc.
should be clean..

Any ideas?


regards, Berend

- ----

import sgmllib


class MyParser(sgmllib.SGMLParser):

	content = ''		
	markup = []
	span_stack = []

	def handle_data(self, data):
		self.content += data

	def unknown_starttag(self, tag, attr):
		stack = { tag: ( dict(attr), ( len(self.content), ) ) }
		self.span_stack.append(stack)

	def unknown_endtag(self, tag):
		prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]

		if tag:
			# close all tags on stack until it finds a matching end tag
			# XXX: need to return to LEVEL, not same tag name
			while tag != prev_tag:
				span = { prev_tag: ( attr, ( offset, 0 ) ) }
				self.markup.append( span )

				prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]

		length = len( self.content ) - offset
		span = { tag: ( attr, ( offset, length ) ) }
		self.markup.append( span )

	def do_unknown_tag(self, tag, attr):
		assert not tag and not attr, "do_unknown_tag %s, %s" % (tag, attr)

	def close(self):
		sgmllib.SGMLParser.close(self)
		self.content = ''
		self.markup = []
		self.span_stack = []						


def parse_data(data):
	sp = MyParser()
	sp.feed(data)
	r = sp.content, sp.markup
	sp.close()
	return r

print parse_data('<test><t />Test</test>')
print parse_data('<xml>\n</xml>\r\n')
print parse_data('<sgml><s>Test 3</s></sgml>')



- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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k3eiwfD0yw6t+giXJy1nako=
=afE6
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From news123 at free.fr  Fri Feb 13 09:04:33 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 15:04:33 +0100
Subject: best set of modules for web automation without javascript
Message-ID: <49957df1$0$15145$426a74cc@news.free.fr>

Hi,


I'd like to do some web automation with python 2.5
- https:
- a cookiejar
- some forms to be filled in


what is the best set of modules.

As far as I understood, there is httplib, but it seems (if I understood
well) to be incoompatible with cookielib

I'm a newcomer to webautomation with python and would be thankful for
good suggestions.


I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
forgot the name) to handle parsing and filling in Forms.

thanks in advance for any pointers opinions


N


From goon12 at gmail.com  Fri Feb 13 09:23:21 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Fri, 13 Feb 2009 09:23:21 -0500
Subject: best set of modules for web automation without javascript
In-Reply-To: <49957df1$0$15145$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <6a2ccd190902130623ra571796o62d0143a1ddca6bb@mail.gmail.com>

On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
> Hi,
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
> what is the best set of modules.

I have automated some testing of our product, using it's web UI with
Python with urllib2 and urrlib. I don't actually fill in the forms, I
just recreate the post and set the values of the post variables (so I
don't get any form validation).

Check out:
urllib2.build_opener
urllib2.HTTPCookieProcessor
urllib2.Request


From andrew at acooke.org  Fri Feb 13 09:27:51 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 13 Feb 2009 11:27:51 -0300
Subject: sgmllib parser keeps old tag data?
References: <20090213135803.GB2168@iris.furrow.ath.cx>
Message-ID: <gn401g$u76$1@ger.gmane.org>


you are declaring class variables, not instance variables.  you need to
declare these in an __init__ method.  RTFM. 
http://docs.python.org/tutorial/classes.html#a-first-look-at-classes

Berend van Berkum wrote:
> class MyParser(sgmllib.SGMLParser):
> 
> content = ''
> markup = []
> span_stack = []




From google at mrabarnett.plus.com  Fri Feb 13 09:31:40 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 14:31:40 +0000
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <20090213135803.GB2168@iris.furrow.ath.cx>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
Message-ID: <4995844C.7080104@mrabarnett.plus.com>

Berend van Berkum wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> Hi everyone,
> 
> I read the source, made numerous tests, but SGMLParser's keeps returning *tag* data 
> from previous parser instances. I'm totally confused why.. The content data it
> returns is ok.
> 
> E.g.::
> 
>     sp = MyParser()
>     sp.feed('<test><t />Test</test>')
>     print sp.content, sp.markup
>     sp.close()
> 
>     sp = MyParser()
>     sp.feed('<xml>\n</xml>\r\n')
>     print sp.content, sp.markup
>     sp.close()
> 
> gives::
> 
>     ('Test', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}]) 
>     ('\n\r\n', [{'t': ({}, (0, 0))}, {'test': ({}, (0, 4))}, {'xml': ({}, (0, 1))}])
> 
> It keeps the tags from the previous session, while i'm sure the stack etc.
> should be clean..
> 
> Any ideas?
> 
> 
> regards, Berend
> 
> - ----
> 
> import sgmllib
> 
> 
> class MyParser(sgmllib.SGMLParser):
> 
> 	content = ''		
> 	markup = []
> 	span_stack = []
> 
These are in the _class_ itself, so they will be shared by all its
instances. You should so something like this instead:

	def __init__(self):
		self.content = ''
		self.markup = []
		self.span_stack = []

> 	def handle_data(self, data):
> 		self.content += data
> 
> 	def unknown_starttag(self, tag, attr):
> 		stack = { tag: ( dict(attr), ( len(self.content), ) ) }
> 		self.span_stack.append(stack)
> 
> 	def unknown_endtag(self, tag):
> 		prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]
> 
> 		if tag:
> 			# close all tags on stack until it finds a matching end tag
> 			# XXX: need to return to LEVEL, not same tag name
> 			while tag != prev_tag:
> 				span = { prev_tag: ( attr, ( offset, 0 ) ) }
> 				self.markup.append( span )
> 
> 				prev_tag, ( attr, ( offset, ) ) = self.span_stack.pop().items()[0]
> 
> 		length = len( self.content ) - offset
> 		span = { tag: ( attr, ( offset, length ) ) }
> 		self.markup.append( span )
> 
> 	def do_unknown_tag(self, tag, attr):
> 		assert not tag and not attr, "do_unknown_tag %s, %s" % (tag, attr)
> 
> 	def close(self):
> 		sgmllib.SGMLParser.close(self)
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []						
> 
> 
> def parse_data(data):
> 	sp = MyParser()
> 	sp.feed(data)
> 	r = sp.content, sp.markup
> 	sp.close()
> 	return r
> 
> print parse_data('<test><t />Test</test>')
> print parse_data('<xml>\n</xml>\r\n')
> print parse_data('<sgml><s>Test 3</s></sgml>')
> 



From python at bdurham.com  Fri Feb 13 09:45:08 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 13 Feb 2009 09:45:08 -0500
Subject: Invoking CutePDF from within Python
In-Reply-To: <499531A5.5010805@timgolden.me.uk>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
Message-ID: <1234536308.14311.1300203191@webmail.messagingengine.com>

Tim,

> FWIW, I usually generate PDFs by printing to a Postscript printer (some random Apple Laserthingy) and then using Ghostscript to do the conversion. I'm happy to post if you're interested.

If its not too much bother, I would be interested in learning how you're
interfacing to Python to Ghostscript.

Regards,
Malcolm


From berend at dotmpe.com  Fri Feb 13 09:51:01 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Fri, 13 Feb 2009 15:51:01 +0100
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <4995844C.7080104@mrabarnett.plus.com>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<4995844C.7080104@mrabarnett.plus.com>
Message-ID: <20090213145101.GC2168@iris.furrow.ath.cx>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, Feb 13, 2009 at 02:31:40PM +0000, MRAB wrote:
> Berend van Berkum wrote:
> >
> >import sgmllib
> >
> >
> >class MyParser(sgmllib.SGMLParser):
> >
> >	content = ''		
> >	markup = []
> >	span_stack = []
> >
> These are in the _class_ itself, so they will be shared by all its
> instances. You should so something like this instead:
> 
> 	def __init__(self):
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []
> 

Yes.. tested that and SGMLParser won't let me override __init__, 
(SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) call).
Tried some but not the following:
with a differently named init function and one boolean class var 'initialized'
it can check 'if self.initialized' in front of each handler. Does the trick.

Confusion dissolved :)
thanks.

- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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From mail at timgolden.me.uk  Fri Feb 13 09:54:33 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 13 Feb 2009 14:54:33 +0000
Subject: Invoking CutePDF from within Python
In-Reply-To: <1234536308.14311.1300203191@webmail.messagingengine.com>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
	<1234536308.14311.1300203191@webmail.messagingengine.com>
Message-ID: <499589A9.3060404@timgolden.me.uk>

python at bdurham.com wrote:
> Tim,
> 
>> FWIW, I usually generate PDFs by printing to a Postscript printer (some random Apple Laserthingy) and then using Ghostscript to do the conversion. I'm happy to post if you're interested.
> 
> If its not too much bother, I would be interested in learning how you're
> interfacing to Python to Ghostscript.

Really boring, I'm afraid. Just popen and an .exe:

http://pastebin.com/m461bf8f2

(There are a few dependencies I haven't shown but I
hope the approach is obvious; happy to explain / supply
details)

TJG


From python at bdurham.com  Fri Feb 13 10:07:51 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 13 Feb 2009 10:07:51 -0500
Subject: Invoking CutePDF from within Python
In-Reply-To: <499589A9.3060404@timgolden.me.uk>
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<499531A5.5010805@timgolden.me.uk>
	<1234536308.14311.1300203191@webmail.messagingengine.com>
	<499589A9.3060404@timgolden.me.uk>
Message-ID: <1234537671.19677.1300207371@webmail.messagingengine.com>

Tim,

> http://pastebin.com/m461bf8f2

Wonderful! That's enough to get me started. Thank you very much.

Cheers,
Malcolm


From news123 at free.fr  Fri Feb 13 10:09:05 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 16:09:05 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <mailman.9491.1234535004.3487.python-list@python.org>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
Message-ID: <49958d11$0$12422$426a74cc@news.free.fr>


Hi Joel,

Thanks,
This (the urllib2 methods you combined with cookielib) is what I am
currently trying to do.

I would just like to retrieve all the field names and default values of
a form. (Some forms are huge) and wondered thus whether there's already
a python module parsing a html documents for forms , form fields and
field vaules, returning an objcet. that could be modified and posted.


bye

N



Joe Riopel wrote:
> On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
>> Hi,
>> I'd like to do some web automation with python 2.5
>> - https:
>> - a cookiejar
>> - some forms to be filled in
>> what is the best set of modules.
> 
> I have automated some testing of our product, using it's web UI with
> Python with urllib2 and urrlib. I don't actually fill in the forms, I
> just recreate the post and set the values of the post variables (so I
> don't get any form validation).
> 
> Check out:
> urllib2.build_opener
> urllib2.HTTPCookieProcessor
> urllib2.Request


From marco at sferacarta.com  Fri Feb 13 10:12:24 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Fri, 13 Feb 2009 16:12:24 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49958d11$0$12422$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <s5gll.29966$8Z.25363@tornado.fastwebnet.it>

News123 wrote:

> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.

http://wwwsearch.sourceforge.net/ClientForm/
http://wwwsearch.sourceforge.net/mechanize/


From james at agentultra.com  Fri Feb 13 10:17:48 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 13 Feb 2009 07:17:48 -0800
Subject: [ANN] TracShell 0.1 released
References: <85ab8rkawn.fsf@agentultra.com>
Message-ID: <87k57uv00z.fsf@agentultra.com>

J Kenneth King <james at agentultra.com> writes:

> I tend to work a lot with Trac for project management and have always
> found the browser interface to be a productivity killer. I always
> wanted a simple command-line interface to Trac, but having never found
> one I found a little free time and got off my laurels to make one.
>
> TracShell 0.1 is an early release, but it works. So far you can only
> query and view tickets, but planned updates include the obvious
> ability to create and edit tickets. Future plans will allow browsing
> of comments, change histories, attachments, and so forth.
>
> Please consider it really beta. The code needs a little tidying up
> around the edges. If you find any bugs, please report them and I'll
> fix them ASAP. Ideas, suggestions, and contributions are welcome.
>
> http://code.google.com/p/tracshell/
>
> Cheers.

Just added the ability to create tickets, more features forthcoming.

I highly recommend anyone using this tool to stick to the latest svn
versions. I'll package the feature-complete stables going forward.

Cheers.


From james at agentultra.com  Fri Feb 13 10:21:04 2009
From: james at agentultra.com (J Kenneth King)
Date: Fri, 13 Feb 2009 07:21:04 -0800
Subject: is there a project running (GUI Builder for Python ) ?
References: <aa5fe961-d4cd-41dc-9be2-e5953d4fe7a9@j39g2000yqn.googlegroups.com>
	<mailman.9428.1234467669.3487.python-list@python.org>
	<aedfee1e-d7e2-41fc-88d4-1cf3fd8484cd@h16g2000yqj.googlegroups.com>
Message-ID: <87fxiiuzvj.fsf@agentultra.com>

gc_ottawa at yahoo.ca writes:

> ......I come from Delphi, and compared to Delphi, even Visual Studio
>> vanishes ;-)
> ...........I don't even notice the difference between Delphi (which
> I'm still using)
>> and wxPython.
>>
>> I think this story happened to other people to,
>> so instead of putting a lot of effort in designing and maintaining a GUI
>> builders,
>> it might be better to choose another solution.
>>
>> btw, the idea I used, can be seen here]http://mientki.ruhosting.nl/data_www/pylab_works/pw_gui_support.html
>> and the code can be found herehttp://code.google.com/p/pylab-works/downloads/list
>>
>> cheers,
>> Stef
>
> You know, 10 or more years ago both Borland and Microsoft got it right
> when they incorporated a GUI with an IDE in their Delphi and Visual
> Basic products. As wonderful as the Python language is, it is very
> much a work in progress when compared to the ease of use of the
> aforementioned products. These products revolutionized the industry
> with their "Rapid Applications Development" (RAD).
>
> Python reminds me of a toolbox filled with a multitude of single use
> tools when all you need is a Skilsaw and a combination screwdriver.
> Gord

... So use the combination screwdriver.

Python isn't all things to all people. It is what it is.


From google at mrabarnett.plus.com  Fri Feb 13 10:41:52 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 15:41:52 +0000
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <20090213145101.GC2168@iris.furrow.ath.cx>
References: <20090213135803.GB2168@iris.furrow.ath.cx>	<4995844C.7080104@mrabarnett.plus.com>
	<20090213145101.GC2168@iris.furrow.ath.cx>
Message-ID: <499594C0.9020509@mrabarnett.plus.com>

Berend van Berkum wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On Fri, Feb 13, 2009 at 02:31:40PM +0000, MRAB wrote:
>> Berend van Berkum wrote:
>>> import sgmllib
>>>
>>>
>>> class MyParser(sgmllib.SGMLParser):
>>>
>>> 	content = ''		
>>> 	markup = []
>>> 	span_stack = []
>>>
>> These are in the _class_ itself, so they will be shared by all its
>> instances. You should so something like this instead:
>>
>> 	def __init__(self):
>> 		self.content = ''
>> 		self.markup = []
>> 		self.span_stack = []
>>
> 
> Yes.. tested that and SGMLParser won't let me override __init__, 
> (SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) call).

OK, so SGMLParser needs to be initialised:

	def __init__(self):
		sgmllib.SGMLParser.__init__(self)
		self.content = ''
		self.markup = []
		self.span_stack = []

> Tried some but not the following:
> with a differently named init function and one boolean class var 'initialized'
> it can check 'if self.initialized' in front of each handler. Does the trick.
> 
> Confusion dissolved :)
> thanks.
> 


From synnovefredericks at gmail.com  Fri Feb 13 10:52:57 2009
From: synnovefredericks at gmail.com (synarcane)
Date: Fri, 13 Feb 2009 07:52:57 -0800 (PST)
Subject: Developer needed for Open Source Django/Pinax on-line community
Message-ID: <d3de6261-b330-44b2-abcd-b4f921d457d4@h20g2000yqn.googlegroups.com>

The Hub is a global community of innovators from every profession,
background and culture working at 'new frontiers' to tackle the
world's
most pressing social, cultural and environmental challenges.  The Hub
has over 1000 members hotdesking in stunning spaces around the world.
The Hub aims to give its members the tools and resources they need to
take their ideas from inception to scale. To this end we are building
an
Open Source online platform to enable Hub members to collaborate
virtually. We have identified Pinax as the platform for building this
over the next few months.

The Hub+ team is the team which provides technology to Hubs globally.
We
are looking for an experienced and enthusiastic Python programmer to
work on a Django/Pinax project in a team committed to Open Source
software and open innovation. If you are interested in inspiring
initiatives and enjoy working in an innovative environment we'd like
you
to join our small team to help build the Hub's ambitious technical
infrastructure.

There will be plenty of opportunities to get involved in other
cutting
edge technical projects with The Hub including real-time comet based
services, network visualisation, collaborative real-time mind-
mapping,
guided navigation, VOIP triggering, and video messaging.

Required
- Experienced Python developer
- Knowledge of Django development
- Javascript
- Basic HTML/CSS
- Based in London (or willing to move)

Preferred*
- Experience in Pinax
- JQuery / YUI
- Active in Open Source communities
- Interest in open innovation
- Twisted
- Comet / Orbited

Please send an e-mail by 23rd February 2009, to synnove.fredericks at the-
hub.net, with some samples of your work, your CV and tell us why you
are interested in joining us.


From andrew at acooke.org  Fri Feb 13 10:54:45 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 13 Feb 2009 12:54:45 -0300
Subject: sgmllib parser keeps old tag data?
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<gn401g$u76$1@ger.gmane.org>
Message-ID: <gn454e$io3$1@ger.gmane.org>


Sorry, this reply was delayed (trying to use usenet...) and so now seems
(even more) bad tempered than needed.  Andrew

andrew cooke wrote:
> you are declaring class variables, not instance variables.  you need to
> declare these in an __init__ method.  RTFM.
> http://docs.python.org/tutorial/classes.html#a-first-look-at-classes
> 
> Berend van Berkum wrote:
>> class MyParser(sgmllib.SGMLParser):
>> 
>> content = ''
>> markup = []
>> span_stack = []
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list




From zpeteljac at gmaljo.com  Fri Feb 13 11:06:55 2009
From: zpeteljac at gmaljo.com (Kurioz)
Date: Fri, 13 Feb 2009 17:06:55 +0100
Subject: Python knapsack problem
Message-ID: <gn45qd$t67$1@ss408.t-com.hr>

Hi,

I got the assignment to solve the knapsack problem in Python. I have to find 
the solution to put items in a sack (I have only one item A, B and C) which 
maxWeight can't be larger than 6 kilograms.  Solution of this problem should 
be A and C but the only solution I'm getting is B and C which aren't true 
because weight of the B and C is 7 kilograms which is heavier than the 
maxWeight.

If anyone could point me what am I doing wrong I'd be very grateful! Thanks 
in advance!

Code:

#1st array element is weight of an item, and 2nd array element is value
A=[2.0,1.0]
B=[3.0,7.0]
C=[4.0,8.0]
#Checking the values per one kilo
vA=A[1]/A[0]
vB=B[1]/B[0]
vC=C[1]/C[0]
maxWeight=0
print vA,vB,vC
#Checking the values
while maxWeight<6:
    if int(vA)>int(vB) and int(vA)>int(vC):
        maxWeight=maxWeight+A[0]
        vA=0
        print maxWeight

    elif int(vB)>int(vA) and int(vB)>int(vC):
        maxWeight=maxWeight+B[0]
        print maxWeight

    else:
        vC=0
        maxWeight=maxWeight+C[0]
        print maxWeight 



From nick at craig-wood.com  Fri Feb 13 11:31:56 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 13 Feb 2009 10:31:56 -0600
Subject: Escaping my own chroot...
References: <slrngp5p32.cq9.nick@irishsea.home.craig-wood.com>
	<mailman.9339.1234370135.3487.python-list@python.org>
Message-ID: <slrngpb67h.aq5.nick@irishsea.home.craig-wood.com>

Jean-Paul Calderone <exarkun at divmod.com> wrote:
>  On Wed, 11 Feb 2009 09:31:56 -0600, Nick Craig-Wood <nick at craig-wood.com> wrote:
> >r0g <aioe.org at technicalbloke.com> wrote:
> >>  I'm writing a linux remastering script in python where I need to chroot
> >>  into a folder, run some system commands and then come out and do some
> >>  tidying up, un-mounting proc & sys etc.
> >>
> >>  I got in there with os.chroot() and I tried using that to get back out
> >>  but that didn't work so... is my script trapped in there forever now or
> >>  is there an un-hacky way to escape?
> >
> >No!
> 
>  If you still have root in the chroot (and you need root to get in there, so
>  it's not implausible that you will), then you can get out.  Googling for
>  "escape chroot" turns up lots of hits.  This page contains a fairly simple,
>  explicit description of how to get out of a chroot:
> 
>     http://www.bpfh.net/simes/computing/chroot-break.html
> 
>  See the bulleted list in the "Breaking chroot()" section.  Since you also
>  control the process before the chroot happens, breaking out is even simpler
>  in your case (just open / before you chroot in the first place).  forking
>  before doing the chroot may still be a good idea, but it's not the only
>  solution.

I admit it can be done, but I'm not sure it isn't hacky!

#!/usr/bin/python

"""
Enter a chroot and escape again

Run as root
"""

import os
import sys

def ls(path):
    """List the path"""
    print "Directory listing of %r" % path
    for f in os.listdir(path):
        print ">>", f

def main():
    if len(sys.argv) < 2:
        print >>sys.stderr, "Need directory to chroot to as an argument"
        raise SystemExit(1)
    chroot_dir = sys.argv[1]
    print "Opening root"
    root = os.open("/", os.O_RDONLY)
    print "Before chroot"
    ls("/")
    print "Chrooting to %r" % chroot_dir
    os.chroot(chroot_dir)
    ls("/")
    print "Breaking the chroot"
    os.fchdir(root)
    for i in range(100):
        os.chdir("..")
    os.chroot(".")
    ls("/")
    os.close(root)

if __name__ == "__main__":
    main()


I ran this

$ mkdir chroot_test
$ touch chroot_test/in_the_chroot
$ sudo ./chroot_test.py chroot_test

And it produced this

Opening root
Before chroot
Directory listing of '/'
>> lost+found
>> home
>> bin
>> boot
>> proc
>> dev
>> etc
[snip]
Chrooting to 'chroot_test'
Directory listing of '/'
>> in_the_chroot
Breaking the chroot
Directory listing of '/'
>> lost+found
>> home
>> bin
>> boot
>> proc
>> dev
>> etc
[snip]


-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From david at abbottdavid.com  Fri Feb 13 12:03:42 2009
From: david at abbottdavid.com (David)
Date: Fri, 13 Feb 2009 12:03:42 -0500
Subject: *nix tail -f multiple log files with Thread
Message-ID: <4995A7EE.2000302@abbottdavid.com>

Hi everyone,

I copied a program from C to track multiple log files. I would like to 
be able to print a label when a log file is updated. Here is the program;

<code>
#!/usr/bin/python
from threading import Thread
import subprocess
from Queue import Queue

num_threads = 3
queue = Queue()
logfiles = ["/var/log/messages",
         "/var/log/apache2/access_log",
         "/var/log/apache2/error_log"]

def logtailer(i, q,):
     while True:
         lfile = q.get()
         sudo = "sudo"
         tail = "tail"
         arg = "-f"
         ret = subprocess.call([sudo, tail, arg, lfile])
         q.task_done()

for i in range(num_threads):
     worker = Thread(target=logtailer, args=(i, queue))
     worker.setDaemon(True)
     worker.start()

for lfile in logfiles:
     queue.put(lfile)

queue.join()
</code>

And here is a sample of the output;

[Fri Feb 13 08:58:48 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
[Fri Feb 13 08:58:51 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
Feb 13 09:02:26 opteron sudo:    david : TTY=pts/4 ; PWD=/home/david ; 
USER=root ; COMMAND=/bin/tail -f /var/log/apache2/error_log
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session opened for 
user root by david(uid=0)
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session closed for 
user root
Feb 13 09:10:01 opteron cron[10633]: (root) CMD (test -x 
/usr/sbin/run-crons && /usr/sbin/run-crons )
Feb 13 09:18:33 opteron su[10678]: Successful su for root by david
Feb 13 09:18:33 opteron su[10678]: + pts/6 david:root
Feb 13 09:18:33 opteron su[10678]: pam_unix(su:session): session opened 
for user root by david(uid=1000)
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/favicon.ico HTTP/1.1" 200 894
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/lib/speller/spellChecker.js HTTP/1.1" 200 15980
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET / HTTP/1.1" 200 13718
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/styles.php HTTP/1.1" 200 30709

I would like to be able to add a label like;

<error_log>
[Fri Feb 13 08:58:48 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
[Fri Feb 13 08:58:51 2009] [error] [client 127.0.0.1] File does not 
exist: /var/www/localhost/htdocs/moodle/favicon.ico
<syslog>
Feb 13 09:02:26 opteron sudo:    david : TTY=pts/4 ; PWD=/home/david ; 
USER=root ; COMMAND=/bin/tail -f /var/log/apache2/error_log
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session opened for 
user root by david(uid=0)
Feb 13 09:02:26 opteron sudo: pam_unix(sudo:session): session closed for 
user root
Feb 13 09:10:01 opteron cron[10633]: (root) CMD (test -x 
/usr/sbin/run-crons && /usr/sbin/run-crons )
Feb 13 09:18:33 opteron su[10678]: Successful su for root by david
Feb 13 09:18:33 opteron su[10678]: + pts/6 david:root
Feb 13 09:18:33 opteron su[10678]: pam_unix(su:session): session opened 
for user root by david(uid=1000)
<access_log>
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/favicon.ico HTTP/1.1" 200 894
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/lib/speller/spellChecker.js HTTP/1.1" 200 15980
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET / HTTP/1.1" 200 13718
127.0.0.1 - - [13/Feb/2009:09:18:47 -0500] "GET 
/theme/custom_corners/styles.php HTTP/1.1" 200 30709

I can create the label like this;
def label()
     print "<%s\n>" % lfile

But I have no idea how to get it to work when a thread is updated.
thanks
-david

-- 
Powered by Gentoo GNU/LINUX
http://www.linuxcrazy.com
pgp.mit.edu



From http  Fri Feb 13 12:25:10 2009
From: http (Paul Rubin)
Date: 13 Feb 2009 09:25:10 -0800
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <7xr622z1u1.fsf@ruckus.brouhaha.com>

News123 <news123 at free.fr> writes:
> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.

BeautifulSoup may be of some help.


From news123 at free.fr  Fri Feb 13 12:41:00 2009
From: news123 at free.fr (News123)
Date: Fri, 13 Feb 2009 18:41:00 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49958d11$0$12422$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9491.1234535004.3487.python-list@python.org>
	<49958d11$0$12422$426a74cc@news.free.fr>
Message-ID: <4995b0ad$0$2695$426a74cc@news.free.fr>

Hi Marco / Paul,

Thanks


I'll look into
mechanize,ClientForm and BeautifulSoup.

All three are now installed. I'll just have to play with them.


bye


N

News123 wrote:
> Hi Joel,
> 
> Thanks,
> This (the urllib2 methods you combined with cookielib) is what I am
> currently trying to do.
> 
> I would just like to retrieve all the field names and default values of
> a form. (Some forms are huge) and wondered thus whether there's already
> a python module parsing a html documents for forms , form fields and
> field vaules, returning an objcet. that could be modified and posted.
> 
> 
> bye
> 
> N
> 
> 
> 
> Joe Riopel wrote:
>> On Fri, Feb 13, 2009 at 9:04 AM, News123 <news123 at free.fr> wrote:
>>> Hi,
>>> I'd like to do some web automation with python 2.5
>>> - https:
>>> - a cookiejar
>>> - some forms to be filled in
>>> what is the best set of modules.
>> I have automated some testing of our product, using it's web UI with
>> Python with urllib2 and urrlib. I don't actually fill in the forms, I
>> just recreate the post and set the values of the post variables (so I
>> don't get any form validation).
>>
>> Check out:
>> urllib2.build_opener
>> urllib2.HTTPCookieProcessor
>> urllib2.Request


From tripplowe at gmail.com  Fri Feb 13 12:59:22 2009
From: tripplowe at gmail.com (tripp)
Date: Fri, 13 Feb 2009 09:59:22 -0800 (PST)
Subject: Fortran array in python (f2py?)...
Message-ID: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>

Hello Folks,

I have a fortran program I use to process several satellite images.  I
currently output the results to a text file (~750 mb) which is then
read by a perl program that outputs a GIS-ready image using GDAL
(www.gdal.org).   There are python libraries for GDAL too.

I'd like to pipe the array directly to python from fortran (instead of
writing it out to a text file).  Is it possible to access an in-memory
fortran array with python?

I've looked at f2py, but I could not tell if this was possible.

Thanks.
-TLowe





From matiassurdi at gmail.com  Fri Feb 13 13:01:04 2009
From: matiassurdi at gmail.com (Matias Surdi)
Date: Fri, 13 Feb 2009 19:01:04 +0100
Subject: best set of modules for web automation without javascript
In-Reply-To: <49957df1$0$15145$426a74cc@news.free.fr>
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <gn4ch0$euq$1@ger.gmane.org>

You should give a look to Selenium. It's great.

http://www.openqa.org



News123 wrote:
> Hi,
> 
> 
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
> 
> 
> what is the best set of modules.
> 
> As far as I understood, there is httplib, but it seems (if I understood
> well) to be incoompatible with cookielib
> 
> I'm a newcomer to webautomation with python and would be thankful for
> good suggestions.
> 
> 
> I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> forgot the name) to handle parsing and filling in Forms.
> 
> thanks in advance for any pointers opinions
> 
> 
> N
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From tjreedy at udel.edu  Fri Feb 13 13:05:10 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:05:10 -0500
Subject: something wrong with isinstance
In-Reply-To: <op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>
References: <2a84f320-8be2-4482-9513-4d7edf3295ac@j8g2000yql.googlegroups.com>	<8677703b-4284-4283-83a7-ac095eb5af4f@33g2000yqm.googlegroups.com>	<ad547856-9e48-4d45-a2ec-9d21f56fade8@i18g2000prf.googlegroups.com>	<mailman.9481.1234520852.3487.python-list@python.org>	<gn3irc$mss$02$1@news.t-online.com>
	<op.upad4n1kx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <gn4col$fug$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Fri, 13 Feb 2009 08:43:03 -0200, Peter Otten <__peter__ at web.de> 
> escribi?:

>>>>> class Type(type):
>> ...     def __instancecheck__(self, other): return True
>> ...
>>>>> class A(metaclass=Type): pass
>> ...
>>>>> class B: pass
>> ...
>>>>> isinstance(B(), A)
>> True
>>
>> See also
>>
>> http://www.python.org/dev/peps/pep-3119/#overloading-isinstance-and-issubclass 
>>
> 
> Ah, ok. Isn't menctioned in the main documentation though.

Lack reported in http://bugs.python.org/issue5250



From mccredie at gmail.com  Fri Feb 13 13:16:40 2009
From: mccredie at gmail.com (Matimus)
Date: Fri, 13 Feb 2009 10:16:40 -0800 (PST)
Subject: Python knapsack problem
References: <gn45qd$t67$1@ss408.t-com.hr>
Message-ID: <1d7e1bcd-58f6-4788-9e42-9f6ed04369c1@b38g2000prf.googlegroups.com>

On Feb 13, 8:06?am, "Kurioz" <zpetel... at gmaljo.com> wrote:
> Hi,
>
> I got the assignment to solve the knapsack problem in Python. I have to find
> the solution to put items in a sack (I have only one item A, B and C) which
> maxWeight can't be larger than 6 kilograms. ?Solution of this problem should
> be A and C but the only solution I'm getting is B and C which aren't true
> because weight of the B and C is 7 kilograms which is heavier than the
> maxWeight.
>
> If anyone could point me what am I doing wrong I'd be very grateful! Thanks
> in advance!
>
> Code:
>
> #1st array element is weight of an item, and 2nd array element is value
> A=[2.0,1.0]
> B=[3.0,7.0]
> C=[4.0,8.0]
> #Checking the values per one kilo
> vA=A[1]/A[0]
> vB=B[1]/B[0]
> vC=C[1]/C[0]
> maxWeight=0
> print vA,vB,vC
> #Checking the values
> while maxWeight<6:
> ? ? if int(vA)>int(vB) and int(vA)>int(vC):
> ? ? ? ? maxWeight=maxWeight+A[0]
> ? ? ? ? vA=0
> ? ? ? ? print maxWeight
>
> ? ? elif int(vB)>int(vA) and int(vB)>int(vC):
> ? ? ? ? maxWeight=maxWeight+B[0]
> ? ? ? ? print maxWeight
>
> ? ? else:
> ? ? ? ? vC=0
> ? ? ? ? maxWeight=maxWeight+C[0]
> ? ? ? ? print maxWeight


You will need to check whether each item can fit before adding it.

Currently you are doing:

while there is room in the sac:
    add the next most valuable item

You should be doing:

while there is room in the sac:
    if the next most valuable item fits
       add it

But... once you fix that you will run into another issue.

You are using ints to compare. Casting floating point values to ints
will always
round down.

vA = 0.5
vB = 2.3333...
vC = 2.0

But..

>>> int(vA)
0
>>> int(vB)
2
>>> int(vC)
2

Matt



From tjreedy at udel.edu  Fri Feb 13 13:22:45 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:22:45 -0500
Subject: Levenshtein word comparison -performance issue
In-Reply-To: <op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<op.upadctnsx6zn5v@gabriel2.softlabbsas.com.ar>
Message-ID: <gn4dpl$jpf$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva 
> <s.selvamsiva at gmail.com> escribi?:
> 
>> I need some help.
>> I tried to find top n(eg. 5) similar words for a given word, from a
>> dictionary of 50,000 words.
>> I used python-levenshtein module,and sample code is as follow.
>>
>> def foo(searchword):
>>     disdict={}
>>     for word in self.dictionary-words:
>>                    distance=Levenshtein.ratio(searchword,word)
>>                    disdict[word]=distance
>>     """
>>      sort the disdict dictionary by values in descending order
>>     """
>>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>>
>>     return similarwords[:5]
> 
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - 
> at least you won't waste time sorting 49995 irrelevant words...

There is also no need to build the 50000 entry word-distance dictionary.

import heapq, functools

def foo(searchword, n):
   distance = functools.partial(Levenshtein.ratio, searchword)
   return heapq.nlargest(n, words, distance)

If the distances are wanted along with the similar words, I strongly 
suspect that it would be faster to recalculate a small number than to 
generate the dict of 50000 pairs.

> Anyway you should measure the time taken by the first part 
> (Levenshtein), it may be the most demanding. I think there is a C 
> extension for this, should be much faster than pure Python calculations.

And such could be dropped into the code above.

Terry Jan Reedy




From google at mrabarnett.plus.com  Fri Feb 13 13:27:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 18:27:00 +0000
Subject: Fortran array in python (f2py?)...
In-Reply-To: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
Message-ID: <4995BB74.7000200@mrabarnett.plus.com>

tripp wrote:
> Hello Folks,
> 
> I have a fortran program I use to process several satellite images.  I
> currently output the results to a text file (~750 mb) which is then
> read by a perl program that outputs a GIS-ready image using GDAL
> (www.gdal.org).   There are python libraries for GDAL too.
> 
> I'd like to pipe the array directly to python from fortran (instead of
> writing it out to a text file).  Is it possible to access an in-memory
> fortran array with python?
> 
> I've looked at f2py, but I could not tell if this was possible.
> 
How about outputting the results to the Python program via a pipe?


From tjreedy at udel.edu  Fri Feb 13 13:34:03 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 13 Feb 2009 13:34:03 -0500
Subject: Python knapsack problem
In-Reply-To: <gn45qd$t67$1@ss408.t-com.hr>
References: <gn45qd$t67$1@ss408.t-com.hr>
Message-ID: <gn4eep$m7h$1@ger.gmane.org>

Kurioz wrote:

> I got the assignment to solve the knapsack problem in Python. I have to 
> find the solution to put items in a sack (I have only one item A, B and 
> C) which maxWeight can't be larger than 6 kilograms.  Solution of this 
> problem should be A and C but the only solution I'm getting is B and C 
> which aren't true because weight of the B and C is 7 kilograms which is 
> heavier than the maxWeight.
> 
> If anyone could point me what am I doing wrong I'd be very grateful! 
> Thanks in advance!

There are several comments I could make, but your immediate problem is 
this: before putting something in the knapsack, you must check whether 
it will exceed the limit.  Since this is a class assignment, I will stop 
there.

> 
> Code:
> 
> #1st array element is weight of an item, and 2nd array element is value
> A=[2.0,1.0]
> B=[3.0,7.0]
> C=[4.0,8.0]
> #Checking the values per one kilo
> vA=A[1]/A[0]
> vB=B[1]/B[0]
> vC=C[1]/C[0]
> maxWeight=0
> print vA,vB,vC
> #Checking the values
> while maxWeight<6:
>    if int(vA)>int(vB) and int(vA)>int(vC):
>        maxWeight=maxWeight+A[0]
>        vA=0
>        print maxWeight
> 
>    elif int(vB)>int(vA) and int(vB)>int(vC):
>        maxWeight=maxWeight+B[0]
>        print maxWeight
> 
>    else:
>        vC=0
>        maxWeight=maxWeight+C[0]
>        print maxWeight
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 



From lists at cheimes.de  Fri Feb 13 13:50:06 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 13 Feb 2009 19:50:06 +0100
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <4995A7EE.2000302@abbottdavid.com>
References: <4995A7EE.2000302@abbottdavid.com>
Message-ID: <gn4fd0$paa$1@ger.gmane.org>

David schrieb:
> Hi everyone,
> 
> I copied a program from C to track multiple log files. I would like to
> be able to print a label when a log file is updated. Here is the program;

Don't use threads for the job. On Unix the preferred way is select()'ing
or poll()'ing multiple file descriptors.

Christian



From goon12 at gmail.com  Fri Feb 13 13:59:58 2009
From: goon12 at gmail.com (Joe Riopel)
Date: Fri, 13 Feb 2009 13:59:58 -0500
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <4995A7EE.2000302@abbottdavid.com>
References: <4995A7EE.2000302@abbottdavid.com>
Message-ID: <6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>

On Fri, Feb 13, 2009 at 12:03 PM, David <david at abbottdavid.com> wrote:
> Hi everyone,
>
> I copied a program from C to track multiple log files. I would like to be
> able to print a label when a log file is updated. Here is the program;

Since you're calling tail itself, why not just use tail's ability to
tail multiple files? It too will output the label.

I am using tail from the GNU coreutils, version 5.97.

I did the following, using two xterms:

First, in one xterm window:
$ touch foo bar
$ tail -f foo bar

Then in another xterm:
$ echo "Hi foo" > foo
$ echo "Hi bar" > bar

Back in the first xterm window I see this:
$ tail -f foo bar
==> foo <==

==> bar <==

==> foo <==
Hi foo

==> bar <==
Hi bar


From david at abbottdavid.com  Fri Feb 13 14:18:11 2009
From: david at abbottdavid.com (David)
Date: Fri, 13 Feb 2009 14:18:11 -0500
Subject: *nix tail -f multiple log files with Thread
In-Reply-To: <6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>
References: <4995A7EE.2000302@abbottdavid.com>
	<6a2ccd190902131059t3502fdfep90a796c65546b302@mail.gmail.com>
Message-ID: <4995C773.9000000@abbottdavid.com>

Joe Riopel wrote:
> On Fri, Feb 13, 2009 at 12:03 PM, David <david at abbottdavid.com> wrote:
>> Hi everyone,
>>
>> I copied a program from C to track multiple log files. I would like to be
>> able to print a label when a log file is updated. Here is the program;
> 
> Since you're calling tail itself, why not just use tail's ability to
> tail multiple files? It too will output the label.
> 
> I am using tail from the GNU coreutils, version 5.97.
> 
> I did the following, using two xterms:
> 
> First, in one xterm window:
> $ touch foo bar
> $ tail -f foo bar
> 
> Then in another xterm:
> $ echo "Hi foo" > foo
> $ echo "Hi bar" > bar
> 
> Back in the first xterm window I see this:
> $ tail -f foo bar
> ==> foo <==
> 
> ==> bar <==
> 
> ==> foo <==
> Hi foo
> 
> ==> bar <==
> Hi bar
> 
> 
Thanks Joe, sure am glad I asked. Oh well it was good practice as I am 
just learning python, I don't know how I missed that I could tail more 
than one file.

-- 
Powered by Gentoo GNU/LINUX
http://www.linuxcrazy.com
pgp.mit.edu



From mmaddox at umd.edu  Fri Feb 13 14:28:09 2009
From: mmaddox at umd.edu (mike)
Date: Fri, 13 Feb 2009 11:28:09 -0800 (PST)
Subject: problems opening files
Message-ID: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>

I have aprogram that manipulates several text files, does some math
and saves new files then exits.

The program worked fine on the original set of data, but with new data
does not open the files as needed.  When I copy and paste the 'open
line' from the module to IDLE the file opens.

section of code that is not working and import statements below:

import statements------------

# combine point source data

from numpy import *
from string import *
import point_input

section of code-----------------

pathincbp=path+'/sub'+sub+'/cbp_'+npdes+'.txt'
    flag='false'
    while flag=='false':
        try:
            cbpin=open(pathincbp,'r')
            flag='true'

stopping the module manually------------------------------

Traceback (most recent call last):
  File "C:\Python25\point_sources\combine_point_sources_swat.py", line
155, in <module>
    print pathincbp+' not found'
KeyboardInterrupt

IDLE commands---------------------------

>>> cbpin=open(pathincbp,'r')
>>> cbpin
<open file 'c:/potomac_points_data/sub1/cbp_PA0026051.txt', mode 'r'
at 0x01450380>

I am running in windows xp professional 2002 service pack 3 on a Xeon
dell

Thanks,
Mike




From tripplowe at gmail.com  Fri Feb 13 14:35:07 2009
From: tripplowe at gmail.com (tripp)
Date: Fri, 13 Feb 2009 11:35:07 -0800 (PST)
Subject: Fortran array in python (f2py?)...
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9506.1234549622.3487.python-list@python.org>
Message-ID: <b623560c-c409-43dc-8adf-a99b9924f760@v39g2000yqm.googlegroups.com>

On Feb 13, 1:27?pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> tripp wrote:
> > Hello Folks,
>
> > I have a fortran program I use to process several satellite images. ?I
> > currently output the results to a text file (~750 mb) which is then
> > read by a perl program that outputs a GIS-ready image using GDAL
> > (www.gdal.org). ? There are python libraries for GDAL too.
>
> > I'd like to pipe the array directly to python from fortran (instead of
> > writing it out to a text file). ?Is it possible to access an in-memory
> > fortran array with python?
>
> > I've looked at f2py, but I could not tell if this was possible.
>
> How about outputting the results to the Python program via a pipe?

The array I'd like to output is 8500 x 7500.  Would that be possible?
I'm NOT RAM limited.


From google at mrabarnett.plus.com  Fri Feb 13 14:40:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 13 Feb 2009 19:40:51 +0000
Subject: problems opening files
In-Reply-To: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>
References: <016a4163-1aaf-493d-9145-c1a1f5cb5cf3@g38g2000yqd.googlegroups.com>
Message-ID: <4995CCC3.7020403@mrabarnett.plus.com>

mike wrote:
> I have aprogram that manipulates several text files, does some math
> and saves new files then exits.
> 
> The program worked fine on the original set of data, but with new data
> does not open the files as needed.  When I copy and paste the 'open
> line' from the module to IDLE the file opens.
> 
> section of code that is not working and import statements below:
> 
> import statements------------
> 
> # combine point source data
> 
> from numpy import *
> from string import *
> import point_input
> 
> section of code-----------------
> 
> pathincbp=path+'/sub'+sub+'/cbp_'+npdes+'.txt'
>     flag='false'
>     while flag=='false':
>         try:
>             cbpin=open(pathincbp,'r')
>             flag='true'
> 
> stopping the module manually------------------------------
> 
> Traceback (most recent call last):
>   File "C:\Python25\point_sources\combine_point_sources_swat.py", line
> 155, in <module>
>     print pathincbp+' not found'
> KeyboardInterrupt
> 
> IDLE commands---------------------------
> 
>>>> cbpin=open(pathincbp,'r')
>>>> cbpin
> <open file 'c:/potomac_points_data/sub1/cbp_PA0026051.txt', mode 'r'
> at 0x01450380>
> 
> I am running in windows xp professional 2002 service pack 3 on a Xeon
> dell
> 
What exception is the open() raising? From the partial code you've
provided I can't tell whether the 'try' is catching any exception. The
traceback just tells me that you interrupted the script, not what "is
not working" actually means.


From Scott.Daniels at Acm.Org  Fri Feb 13 15:09:41 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 13 Feb 2009 12:09:41 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
Message-ID: <-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>

W. eWatson wrote:
> Terry Reedy wrote:
>> W. eWatson wrote:
>>>  From Diez above.
>>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>>> run it
>>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>>> pyhton-file your app is in. That's all that there is to it.
>>>
>>> So this is the absolute truth? No wiggle room? One can never use a 
>>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>>> doesn't issue a standard warning that says, "Get out of here with 
>>> your Tkinter program, it will fail when you try to run it here. You 
>>> have entered Tkinter hell. Good-bye."
>>
>> Re-read my post about kids fighting to control a television.  Maybe 
>> they work together, maybe they crash the TV.  Hard to predict.
>>
>> ***ANY*** Python program that tries to grab and control the same 
>> resources that TK does may conflict with it.  There is no way that 
>> IDLE can have a list of, for instance, all event-grabbing mainloop 
>> programs.
>>
> OK, enough tinkering with the code and others matters on my end trying 
> to find a work around. Somehow after much successful use of IDLE's 
> execution facility, I've stepped on an invisible banana peel. I think 
> it's evident that I'm not going around this problem easily with the IDLE 
> execution attempts, and that another solution is required.
That's correct, but you still don't understand _why_ it is correct.
I suggest you re-read the thread and try to understand everything you
are being told.

> First, I think somewhere up the thread someone suggested that Active 
> pythonWin is not dependent upon Tk, correct? Therefore, it is immune 
> from such problems, correct?

Wrong.  I was the one who said that ActiveState had a product to debug
Python programs across a nertwork connection.  The product is _not_
ActivePython (the freely distributed system), but rather the Komodo IDE,
which does cost money.

> Finally, we can probably agree that I can continue to use IDLE for 
> editing and syntax checking, but to "guarantee" successful execution of 
> the program, I can just double-click on the py file in my folder. 
> Perhaps there is a better way than clicking on it in the folder. For 
> example, putting it on the desktop. As I look at the folder, previous 
> copies only differ by a digit, I can easily find myself executing an 
> earlier version, differing as Dev4, to Dev5 at the end of each name.

OK, you are using the oldest and least useful revision control system,
"rename and remember."  I'd suggest you get and use bazaar, but you'll
just ask for shortcuts on how to use it without understanding what it does.

--Scott David Daniels
Scott.Daniels at Acm.Org


From bryanvick at gmail.com  Fri Feb 13 15:42:41 2009
From: bryanvick at gmail.com (Bryan)
Date: Fri, 13 Feb 2009 12:42:41 -0800 (PST)
Subject: Upgrading standard library module
Message-ID: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>

I have a Python v2.5.2 server running and I found some undesirable
behavior in the xmlrpclib module that is included with that version of
Python.  The xmlrpclib version that is included with Python 2.6
changes the behavior for the better.  I nervous about upgrading my
Python install to 2.6 on this server because I remember reading in the
docs of a library I use that it targets the 2.5 branch.  What is the
best way to only upgrade the xmlrpclib in my 2.5 install?

Also, have you all had problems with libraries not specifying which
Python version they target?  I can't find a requirements for the
formencode library.  It is kind of scary upgrading my Python server
install without being sure all my libraries will work.  Experiences??

Bryan


From castironpi at gmail.com  Fri Feb 13 15:45:49 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Fri, 13 Feb 2009 12:45:49 -0800 (PST)
Subject: pdb in 3.0 very buggy (Win XP Home)
Message-ID: <8a640af7-41e9-4de6-8b18-fa18c3448b64@v5g2000pre.googlegroups.com>

Hi, got a freeze when running 'pdb' in 3.0.

The program executes correctly with the command 'c', but freezes part
way through when running successive 'n' commands.  Platform Windows XP
Home.  Python 3.0 (r30:67507, Dec  3 2008, 20:14:27) [MSC v.1500 32
bit (Intel)] on win32.  The 'list' command was also not working
properly, printing '[EOF]' many places, even when prompted with
arguments for 'first' and 'last'.

/Screen dump:

C:\Documents and Settings\usr\Desktop\working>\programs
\python30\python -m pdb picktest.py

--Return--
> <string>(5)A()->None
(Pdb) c
0
1
2
The program finished and will be restarted
--Return--
> <string>(5)A()->None
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1467)closed()->False
-> return self.buffer.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\encodings\cp437.py(19)encode()->b'0'
-> return codecs.charmap_encode(input,self.errors,encoding_map)[0]
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
0--Return--
> c:\programs\python30\lib\io.py(1060)write()->1
-> return written
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1498)write()->1
-> return length
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(1467)closed()->False
-> return self.buffer.closed
(Pdb) n
--Return--
> c:\programs\python30\lib\encodings\cp437.py(19)encode()->b'\n'
-> return codecs.charmap_encode(input,self.errors,encoding_map)[0]
(Pdb) n
--Return--
> c:\programs\python30\lib\io.py(757)closed()->False
-> return self.raw.closed
(Pdb) n

--Return--
> c:\programs\python30\lib\io.py(1060)write()->1
-> return written
(Pdb) n

/Program:

class A:
    def f( self ):
        self.x= 0
        print( self.x )
    def g( self ):
        self.x+= 1
        print( self.x )

a= A()
a.f()
a.g()
a.g()



From kyosohma at gmail.com  Fri Feb 13 15:46:37 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 13 Feb 2009 12:46:37 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
Message-ID: <9943880a-2d4f-4532-96f5-83ebe4b32e6b@c12g2000yqj.googlegroups.com>

On Feb 13, 2:42?pm, Bryan <bryanv... at gmail.com> wrote:
> I have a Python v2.5.2 server running and I found some undesirable
> behavior in the xmlrpclib module that is included with that version of
> Python. ?The xmlrpclib version that is included with Python 2.6
> changes the behavior for the better. ?I nervous about upgrading my
> Python install to 2.6 on this server because I remember reading in the
> docs of a library I use that it targets the 2.5 branch. ?What is the
> best way to only upgrade the xmlrpclib in my 2.5 install?
>
> Also, have you all had problems with libraries not specifying which
> Python version they target? ?I can't find a requirements for the
> formencode library. ?It is kind of scary upgrading my Python server
> install without being sure all my libraries will work. ?Experiences??
>
> Bryan

Well, you could put your current install in a virtualenv and then try
the new version of Python 2.6 in another virtualenv. See
http://pypi.python.org/pypi/virtualenv for more info.

As long as your 3rd party packages are pure python, you should be ok.
If they depend on c/c++ headers, then you may have issues.

Mike


From robert.kern at gmail.com  Fri Feb 13 16:41:04 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 13 Feb 2009 15:41:04 -0600
Subject: Fortran array in python (f2py?)...
In-Reply-To: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
Message-ID: <gn4pdh$s7a$1@ger.gmane.org>

On 2009-02-13 11:59, tripp wrote:
> Hello Folks,
>
> I have a fortran program I use to process several satellite images.  I
> currently output the results to a text file (~750 mb) which is then
> read by a perl program that outputs a GIS-ready image using GDAL
> (www.gdal.org).   There are python libraries for GDAL too.
>
> I'd like to pipe the array directly to python from fortran (instead of
> writing it out to a text file).  Is it possible to access an in-memory
> fortran array with python?
>
> I've looked at f2py, but I could not tell if this was possible.

f2py makes Python extension modules that wrap FORTRAN code. Basically, what you 
would have to do is use f2py to wrap the subroutines of your FORTRAN program; 
your Python program will be the main driver. It is usually recommended that your 
Python program allocate the memory in the form of a numpy array, and pass it 
into your FORTRAN subroutines to be filled. F77 fixed arrays are well-supported; 
F90 allocatable arrays and pointers are not. You may need a fixed array shim 
layer around your Fortran 90 code if it uses these features.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jason.scheirer at gmail.com  Fri Feb 13 16:52:07 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Fri, 13 Feb 2009 13:52:07 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
Message-ID: <c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>

On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
> I have a Python v2.5.2 server running and I found some undesirable
> behavior in the xmlrpclib module that is included with that version of
> Python. ?The xmlrpclib version that is included with Python 2.6
> changes the behavior for the better. ?I nervous about upgrading my
> Python install to 2.6 on this server because I remember reading in the
> docs of a library I use that it targets the 2.5 branch. ?What is the
> best way to only upgrade the xmlrpclib in my 2.5 install?
>
> Also, have you all had problems with libraries not specifying which
> Python version they target? ?I can't find a requirements for the
> formencode library. ?It is kind of scary upgrading my Python server
> install without being sure all my libraries will work. ?Experiences??
>
> Bryan

Python has always been pretty backwards-compatible and has a nice
roadmap for upgrades (with new languages features living in __future__
for a version or so before they're in the main version). With the
exception of 2.X->3, you can usually assume that any pure-Python
modules written for 2.x will work in 2.(x+1), and assuming they don't
issue any warnings, also in 2.(x+2).

What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
and 2.6, only significant differences I see are checks for True/False
as builtins left over from pre-2.4 and some datetime handling.


From bryanvick at gmail.com  Fri Feb 13 17:17:35 2009
From: bryanvick at gmail.com (Bryan)
Date: Fri, 13 Feb 2009 14:17:35 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
Message-ID: <a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>

On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>
> > I have a Python v2.5.2 server running and I found some undesirable
> > behavior in the xmlrpclib module that is included with that version of
> > Python. ?The xmlrpclib version that is included with Python 2.6
> > changes the behavior for the better. ?I nervous about upgrading my
> > Python install to 2.6 on this server because I remember reading in the
> > docs of a library I use that it targets the 2.5 branch. ?What is the
> > best way to only upgrade the xmlrpclib in my 2.5 install?
>
> > Also, have you all had problems with libraries not specifying which
> > Python version they target? ?I can't find a requirements for the
> > formencode library. ?It is kind of scary upgrading my Python server
> > install without being sure all my libraries will work. ?Experiences??
>
> > Bryan
>
> Python has always been pretty backwards-compatible and has a nice
> roadmap for upgrades (with new languages features living in __future__
> for a version or so before they're in the main version). With the
> exception of 2.X->3, you can usually assume that any pure-Python
> modules written for 2.x will work in 2.(x+1), and assuming they don't
> issue any warnings, also in 2.(x+2).
>
> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
> and 2.6, only significant differences I see are checks for True/False
> as builtins left over from pre-2.4 and some datetime handling.

The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
custom objects.  It checks the type of my object, and if it isn't in a
hard-coded list of types, then a "Cannot marshal object of <type>
type" exception message shows up.  The version in my Windows 2.6
install has a fall back case where if the type is not in the hard-
coded list, it simply calls Object.__dict__ to get a graph of the
object's values that can be marshaled into xmlrpc.

I am using xmlrpc through Pylons.  As a workaround, instead of
returning my custom objects in my xmlrpc server functions, I return
MyObject.__dict__

I also did not see anything in the revision log in the source file
about this change.


From torppa at staff.megabaud.fi  Fri Feb 13 17:50:57 2009
From: torppa at staff.megabaud.fi (Jarkko Torppa)
Date: Fri, 13 Feb 2009 22:50:57 GMT
Subject: *nix tail -f multiple log files with Thread
References: <4995A7EE.2000302@abbottdavid.com>
	<mailman.9508.1234551024.3487.python-list@python.org>
Message-ID: <slrngpbuah.s1i.torppa@polykoira.megabaud.fi>

On 2009-02-13, Christian Heimes <lists at cheimes.de> wrote:
> David schrieb:
>> Hi everyone,
>> 
>> I copied a program from C to track multiple log files. I would like to
>> be able to print a label when a log file is updated. Here is the program;
>
> Don't use threads for the job. On Unix the preferred way is select()'ing
> or poll()'ing multiple file descriptors.

     File descriptors associated with regular files always select
     true  for  ready  to  read, ready to write, and error condi-
     tions.

     Regular files always poll TRUE for reading and writing.

You have to either sleep or use kevent/completion/...

-- 
Jarkko Torppa, Elisa


From rhodri at wildebst.demon.co.uk  Fri Feb 13 17:57:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 13 Feb 2009 22:57:42 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
Message-ID: <op.upbbegcga8ncjz@gnudebst>

On Fri, 13 Feb 2009 11:13:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> OK, enough tinkering with the code and others matters on my end trying  
> to find a work around. Somehow after much successful use of IDLE's  
> execution facility, I've stepped on an invisible banana peel. I think  
> it's evident that I'm not going around this problem easily with the IDLE  
> execution attempts, and that another solution is required.

Congratulations, we've only been telling you this for the last few days.
I wonder, is there any chance that you've noticed the solution given?

> First, I think somewhere up the thread someone suggested that Active  
> pythonWin is not dependent upon Tk, correct?

Someone certainly suggested that something is based on Microsoft
Foundation Classes, which isn't very likely to be Tk-based :-)
Whatever that something is, I'm pretty sure it isn't called "Active
pythonWin".

> Therefore, it is immune from such problems, correct?

No.

Let me put it like this.  Your Tkinter program is listening out for
events like windows being moved, the mouse being clicked, keys being
pressed and so on.  IDLE also listens out for a selection of events
of the same sort.  A different graphical IDE will do the same, but will
trap and interpret the events in an entirely different manner that is
probably not even a little bit compatible with your program.  When
you run your program from inside *any* IDE, not just IDLE, it's a bit
of a lottery as to whether your program gets an event, or the IDE
does.  Chances are, *both* need to see it, at which point you're
stuck.

It is possible to do this successfully, but only in a very limited
way and only if you're very careful.  If you think either of those
conditions hold, you are wrong.


> Second, maybe I missed it above, but when I posted the output from the  
> program that showed the failure, was there anything that said, "IDLE  
> problem" or would even give a clue that's the culprit?

How can it?  It's not IDLE's problem, it's yours.

> Finally, we can probably agree that I can continue to use IDLE for  
> editing and syntax checking, but to "guarantee" successful execution of  
> the program, I can just double-click on the py file in my folder.  
> Perhaps there is a better way than clicking on it in the folder.

Typing at a command prompt.

> For example, putting it on the desktop.

This causes an extra file read as Windows indirects through the desktop
link.  It's unlikely to be a noticeable delay at startup, but I'd
hesitate to call it "better".

> As I look at the folder, previous copies only differ by a digit, I can  
> easily find myself executing an earlier version, differing as Dev4, to  
> Dev5 at the end of each name.

I'd suggest spending a while reading up on version control systems.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From simon.hibbs at gmail.com  Fri Feb 13 18:16:56 2009
From: simon.hibbs at gmail.com (Simon Hibbs)
Date: Fri, 13 Feb 2009 15:16:56 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9446.1234477452.3487.python-list@python.org>
	<24ea9c29-6a0a-43cb-98c6-b6e486f017b9@j38g2000yqa.googlegroups.com>
Message-ID: <165a0269-e7bb-49f0-a1cb-5507901604d7@h5g2000yqh.googlegroups.com>

On 13 Feb, 02:53, azrael <jura.gro... at gmail.com> wrote:

> All I hear when I talk to people who own or eork in SW companies is
> "Python? Isn't that that small scripting language. This will never
> bring a real application." I am tired of hearing this. Even Microsoft
> implemented Python. Only because the GUI building I am thinking about
> of moving to IronPython. But this great comunity holds me bac on
> CPython.

I don't agree at all that Python can't compete with Visual Studio for
GUI development. There are Python modules for Eclipse if you need an
enterprise class IDE. For GUI design the PyQT GUI toolkit includes QT
Designer - a fully featured graphical GUI builder every bit as capable
as the one in Visual Studio. In fact I much prefer working in QT
Designer for GUI layout, the Signals/Slots model for hooking up to the
application  logic is just so much more elegant and robust.

If Eclipse is a bit heavyweight for you, and you're after a Pyhton
equivalent to VB, I can't recommend Eric enough. It's a Python IDE
written in Python using the PyQT toolkit, and integrates directly with
QTDesigner. IMHO it's far superior to anything Microsoft has to offer,
with full native support for MacOS X, Linux and Windows.

The only fly in the ointment in licensing. The QT toolkit will be
fully GPL and LGPL from version 4.4, but PyQT itself has a dual GPL/
commercial licensing structure. Still, it's relatively cheap and well
worth it if you're goingt to do commercial development.

Simon Hibbs


From me at gustavonarea.net  Fri Feb 13 18:56:34 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Fri, 13 Feb 2009 15:56:34 -0800 (PST)
Subject: Turning a signature-changing decorator into a signature-preserving 
	one
Message-ID: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>

Hello, everybody.

I have this signature-changing decorator
<http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
which I
want to turn into a signature-preserving one. Here's my try
<http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
but I get
this error:
http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wrap=no

What am I doing wrong? I think it looks like this example:
http://pypi.python.org/pypi/decorator#async

Thanks in advance.

  - Gustavo.

PS: functols.wrap is not an option because my code has to work with
Python 2.4+.


From basilisk96 at gmail.com  Fri Feb 13 19:22:41 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:22:41 -0800 (PST)
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
Message-ID: <69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>

On Feb 12, 10:39?pm, Damon <damonwisc... at gmail.com> wrote:
> * Like R, every time there is a new version of Python, the repository
> should rebuild the packages, for all supported platforms, and make
> available all those that compile cleanly. R also forces you to write
> properly structured documentation for every exposed function, before
> the repository will accept it.

A very good idea indeed. I would love to start using Py3k today, but I
am still on 2.5 because I depend on win32 binaries for the majority of
my library packages. I can build some myself, but not all. A
repository of prebuilt binaries that stay in step with currently
available language releases would be most welcome.

Just my $0.02,
-Basilisk96


From gloxy at yahoo.com  Fri Feb 13 19:35:28 2009
From: gloxy at yahoo.com (Sue)
Date: Sat, 14 Feb 2009 00:35:28 -0000
Subject: Which to install on my windows vista laptop?
Message-ID: <gn53kg+3atn@eGroups.com>

Hi,

Which python 2.6.1 file should I download for my windows vista home
premium laptop?  (32bit, AMD turion 64 x2)

the windows x86 MSI installer or the windows AMD64 MSI installer? 

Thank you!

Sue



From basilisk96 at gmail.com  Fri Feb 13 19:44:38 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:44:38 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
	<pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>
Message-ID: <48b49eef-b3c1-4a9d-bf38-ad24c2b89622@t11g2000yqg.googlegroups.com>

On Feb 12, 1:15?am, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > I usually strive
> > for comprehensions if a for loop can be reduced to such.
>
> Any particular reason?

Only two.
1.) I was impressed by their clarity and conciseness when I first
discovered them.
2.) I also read now and then that simple list comprehensions are
faster when compared with their for-loop equivalents because of the
way comprehensions are implemented under the hood. My example is a far
cry from a "simple" comprehension, however. :)


> If there's only one call to func(), and you ignore the (probably) fixed
> cost of jumping into a generator each time, then it shouldn't make any
> difference.
>
> If you are comparing one call to func() in a for loop versus three calls
> to func() in a list comp or generator expression, then of course the for
> loop will be more efficient.

I agree. I would rather call func() only once per iteration in any
case. I will revise it to a plain for loop with a single call.

Thanks,
-Basilisk96


From zpeteljac at gmaljo.com  Fri Feb 13 19:45:53 2009
From: zpeteljac at gmaljo.com (Kurioz)
Date: Sat, 14 Feb 2009 01:45:53 +0100
Subject: Which to install on my windows vista laptop?
In-Reply-To: <mailman.9515.1234572128.3487.python-list@python.org>
References: <mailman.9515.1234572128.3487.python-list@python.org>
Message-ID: <gn547e$rh$1@ss408.t-com.hr>

If you are using 32bit OS(which you are) then use the x86 MSI installer. 
AMD64 MSI installer is used only when you are using 64bit OS.
"Sue" <gloxy at yahoo.com> wrote in message 
news:mailman.9515.1234572128.3487.python-list at python.org...
Hi,

Which python 2.6.1 file should I download for my windows vista home
premium laptop?  (32bit, AMD turion 64 x2)

the windows x86 MSI installer or the windows AMD64 MSI installer?

Thank you!

Sue




From basilisk96 at gmail.com  Fri Feb 13 19:54:32 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Fri, 13 Feb 2009 16:54:32 -0800 (PST)
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com> 
	<mailman.9482.1234521740.3487.python-list@python.org>
Message-ID: <78b2288c-6a67-4bc0-bd75-aebd85cc2a1a@i38g2000yqd.googlegroups.com>

On Feb 13, 5:42?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - at ?
> least you won't waste time sorting 49995 irrelevant words...
> Anyway you should measure the time taken by the first part (Levenshtein), ?
> it may be the most demanding. I think there is a C extension for this, ?
> should be much faster than pure Python calculations.

subdist: http://pypi.python.org/pypi/subdist/0.2.1
It uses a modified "fuzzy" version of the Levenshtein algorithm, which
I found more useful than the strict version. The only quirk to it is
that it accepts nothing but unicode. Other than that, it's a keeper.
It is extremely fast.

Cheers,
-Basilisk96


From benjamin.kaplan at case.edu  Fri Feb 13 20:01:32 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 20:01:32 -0500
Subject: A little bit else I would like to discuss
In-Reply-To: <69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9435.1234471235.3487.python-list@python.org>
	<8655e896-8276-4c53-ac6b-557e85f96992@r41g2000yqm.googlegroups.com>
	<69a1b6a7-94f3-448f-aebc-cbb628a72693@j38g2000yqa.googlegroups.com>
Message-ID: <ec96e1390902131701h67f26568na5cff71f8db0784@mail.gmail.com>

On Fri, Feb 13, 2009 at 7:22 PM, Basilisk96 <basilisk96 at gmail.com> wrote:

> On Feb 12, 10:39 pm, Damon <damonwisc... at gmail.com> wrote:
> > * Like R, every time there is a new version of Python, the repository
> > should rebuild the packages, for all supported platforms, and make
> > available all those that compile cleanly. R also forces you to write
> > properly structured documentation for every exposed function, before
> > the repository will accept it.
>
> A very good idea indeed. I would love to start using Py3k today, but I
> am still on 2.5 because I depend on win32 binaries for the majority of
> my library packages. I can build some myself, but not all. A
> repository of prebuilt binaries that stay in step with currently
> available language releases would be most welcome.
>
> Just my $0.02,
> -Basilisk96


With Py3K, it's a little bit more complicated than rebuilding all the
packages. Because it broke compatibility, all of the C extensions have to be
rewritten before they'll work. That's why it's taking longer to create
Python 3 packages than to create 2.6 versions.

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From argo785 at gmail.com  Fri Feb 13 20:35:04 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Fri, 13 Feb 2009 17:35:04 -0800 (PST)
Subject: Easier to wrap C or C++ libraries?
Message-ID: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>

When creating a Python binding to a C or C++ library, which is easier
to wrap, the C lib or the C++ one? Given a choice, if you had to
choose between using one of two libs, one written in C, the other in C+
+ -- both having approximately the same functionality -- which would
you rather deal with from your Python code?

It would seem to me that there's fewer design considerations when
wrapping a library written in C; you just wrap the functions. However,
since Python supports OOP nicely, it might also be that wrapping C++
code *could* also be staightforward... Are there many pitfalls when
having to map C++'s notion of OO to Python?


From zooko at zooko.com  Fri Feb 13 20:55:55 2009
From: zooko at zooko.com (zooko)
Date: Fri, 13 Feb 2009 18:55:55 -0700
Subject: ANNOUNCING allmydata.org "Tahoe", the Least-Authority Filesystem, v1.3
Message-ID: <4DEC20D9-6E49-451C-9F32-50A377F5FAA4@zooko.com>

Folks:

This "Cloud Storage" system is written entirely in Python except for  
the CPU-intensive parts (cryptography and erasure coding), which are  
provided as Python extension modules.  Thanks for making Python such  
a high-quality and effective tool!

Regards,

Zooko

ANNOUNCING allmydata.org "Tahoe", the Least-Authority Filesystem, v1.3

We are pleased to announce the release of version 1.3.0 of "Tahoe", the
Least Authority Filesystem.

Tahoe-LAFS is a secure, decentralized, fault-tolerant filesystem.  All
of the source code is available under a choice of two Free Software,
Open Source licences.

This filesystem is encrypted and distributed over multiple peers in
such a way it continues to function even when some of the peers are
unavailable, malfunctioning, or malicious.

Here is the one-page explanation of the security and fault-tolerance
properties that it offers:

http://allmydata.org/source/tahoe/trunk/docs/about.html

This is the successor to v1.2, which was released July 21, 2008 [1].
This is a major new release, adding a repairer, an efficient backup
command, support for large files, an (S)FTP server, and much more.

See the NEWS file [2] and the known_issues.txt file [3] for more
information.

In addition to the many new features of Tahoe itself, a crop of related
projects have sprung up, including Tahoe frontends for Windows and
Macintosh, two front-ends written in JavaScript, a Tahoe plugin for
duplicity, a Tahoe plugin for TiddlyWiki, a project to create a new
backup tool, CIFS/SMB integration, an iPhone app, and three incomplete
Tahoe frontends for FUSE. See Related Projects on the wiki: [4].


COMPATIBILITY

The version 1 branch of Tahoe is the basis of the consumer backup
product from Allmydata, Inc. -- http://allmydata.com .

Tahoe v1.3 is fully compatible with the version 1 branch of Tahoe.
Files written by v1.3 clients can be read by clients of all versions
back to v1.0 unless the file is too large -- files greater than about
12 GiB (depending on the configuration) can't be read by older clients.
v1.3 clients can read files produced by clients of all versions since
v1.0.  v1.3 servers can serve clients of all versions back to v1.0 and
v1.3 clients can use servers of all versions back to v1.0 (but can't
upload large files to them).

This is the fourth release in the version 1 series.  We believe that
this version of Tahoe is stable enough to rely on as a permanent store
of valuable data.  The version 1 branch of Tahoe will be actively
supported and maintained for the forseeable future, and future versions
of Tahoe will retain the ability to read files and directories produced
by Tahoe v1 for the forseeable future.


WHAT IS IT GOOD FOR?

With Tahoe, you can distribute your filesystem across a set of
computers, such that if some of the computers fail or turn out to be
malicious, the entire filesystem continues to be available, thanks to
the remaining computers.  You can also share your files with other
users, using a simple and flexible access control scheme.

Because this software is new, we do not categorically recommend it as
the sole repository of data which is extremely confidential or
precious.  However, we believe that erasure coding, strong encryption,
Free/Open Source Software and careful engineering make Tahoe safer than
common alternatives, such as RAID, removable drive, tape, or "on-line
storage" or "Cloud storage" systems.

This software comes with extensive unit tests [5], and there are no
known security flaws which would compromise confidentiality or data
integrity.  (For all currently known issues please see the
known_issues.txt file [2].)

This release of Tahoe is suitable for the "friendnet" use case [6] --
it is easy to create a filesystem spread over the computers of you and
your friends so that you can share disk space and files.


LICENCE

You may use this package under the GNU General Public License, version
2 or, at your option, any later version.  See the file "COPYING.GPL"
[7] for the terms of the GNU General Public License, version 2.

You may use this package under the Transitive Grace Period Public
Licence, version 1.0.  The Transitive Grace Period Public Licence has
requirements similar to the GPL except that it allows you to wait for
up to twelve months after you redistribute a derived work before
releasing the source code of your derived work. See the file
"COPYING.TGPPL.html" [8] for the terms of the Transitive Grace Period
Public Licence, version 1.0.

(You may choose to use this package under the terms of either licence,
at your option.)


INSTALLATION

Tahoe works on Linux, Mac OS X, Windows, Cygwin, and Solaris, and
probably most other systems.  Start with "docs/install.html" [9].


HACKING AND COMMUNITY

Please join us on the mailing list [10].  Patches that extend and
improve Tahoe are gratefully accepted -- the RoadMap page [11] shows
the next improvements that we plan to make and CREDITS [12] lists the
names of people who've contributed to the project.  The wiki Dev page
[13] contains resources for hackers.


SPONSORSHIP

Tahoe is sponsored by Allmydata, Inc. [14], a provider of commercial
backup services.  Allmydata, Inc. created the Tahoe project, and
contributes hardware, software, ideas, bug reports, suggestions,
demands, and money (employing several Tahoe hackers and instructing
them to spend part of their work time on this Free Software project).
Also they award customized t-shirts to hackers who find security flaws
in Tahoe (see http://hacktahoe.org ).  Thank you to Allmydata, Inc. for
their generous and public-spirited support.


Zooko Wilcox-O'Hearn
on behalf of the allmydata.org team

Special acknowledgment goes to Brian Warner, whose superb engineering
skills and dedication are primarily responsible for the Tahoe
implementation, and largely responsible for the Tahoe design as well,
not to mention most of the docs and many other things besides.

February 13, 2009
Boulder, Colorado, USA

[1] http://allmydata.org/trac/tahoe/browser/relnotes.txt?rev=2789
[2] http://allmydata.org/trac/tahoe/browser/NEWS
[3] http://allmydata.org/trac/tahoe/browser/docs/known_issues.txt
[4] http://allmydata.org/trac/tahoe/wiki/RelatedProjects
[5] http://allmydata.org/trac/tahoe/wiki/Dev
[6] http://allmydata.org/trac/tahoe/wiki/UseCases
[7] http://allmydata.org/trac/tahoe/browser/COPYING.GPL
[8] http://allmydata.org/source/tahoe/trunk/COPYING.TGPPL.html
[9] http://allmydata.org/source/tahoe/trunk/docs/install.html
[10] http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev
[11] http://allmydata.org/trac/tahoe/roadmap
[12] http://allmydata.org/trac/tahoe/browser/CREDITS?rev=2677
[13] http://allmydata.org/trac/tahoe/wiki/Dev
[14] http://allmydata.com



From barry at python.org  Fri Feb 13 21:15:38 2009
From: barry at python.org (Barry Warsaw)
Date: Fri, 13 Feb 2009 21:15:38 -0500
Subject: RELEASED Python 3.0.1
Message-ID: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On behalf of the Python development team, I'm happy to announce the  
availability of Python 3.0.1, the first bug fix release of Python  
3.0.  Version 3.0.1 fixes dozens of bugs reported since the release of  
Python 3.0 on December 3rd, 2008.

Python 3.0 represents a major milestone in Python's history.  This new  
version of the language is incompatible with the 2.x line of releases,  
while remaining true to BDFL Guido van Rossum's vision.

For more information, links to documentation, and downloadable  
distributions, see the Python 3.0.1 release page:

     http://www.python.org/download/releases/3.0.1/

To report bugs in Python 3.0.1, please submit them to the issue  
tracker at:

     http://bugs.python.org/

Enjoy!
Barry

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Version: GnuPG v1.4.9 (Darwin)

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=vy0O
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From fetchinson at googlemail.com  Fri Feb 13 21:28:22 2009
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Fri, 13 Feb 2009 18:28:22 -0800
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <fbe2e2100902131828wac87b0bh7f23fbc7d6a43db@mail.gmail.com>

> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
>
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

There is no question about it in my mind that wrapping C is easier.
Reason being that python is written in C and not C++.

Cheers,
Daniel

-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From benjamin at python.org  Fri Feb 13 21:40:32 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 14 Feb 2009 02:40:32 +0000 (UTC)
Subject: pdb in 3.0 very buggy (Win XP Home)
References: <8a640af7-41e9-4de6-8b18-fa18c3448b64@v5g2000pre.googlegroups.com>
Message-ID: <loom.20090214T023946-775@post.gmane.org>

Aaron Brady <castironpi <at> gmail.com> writes:

> 
> Hi, got a freeze when running 'pdb' in 3.0.

This is a known issue because of the rewrite of the IO library in 3.0. It will
hopefully be fixed in 3.1. See http://bugs.python.org/issue3618 for more
information. 






From clp2 at rebertia.com  Fri Feb 13 21:40:56 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 13 Feb 2009 18:40:56 -0800
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <50697b2c0902131840h6000f2adkb1c1011a33d8189b@mail.gmail.com>

On Fri, Feb 13, 2009 at 5:35 PM,  <argo785 at gmail.com> wrote:
> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
>
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

You're asking two separate questions here.

(1) For Python bindings, is it easier to wrap C, or C++ libraries?
As Daniel points out, C is easier to wrap because CPython itself is
written in C, and C++ cannot be linked directly to C.

(2) Is it easier to use C or C++ bindings from Python code?
Interface-wise, the C++ bindings would be easier to work with at the
Python level as they are object-oriented.

In practice, C libraries are usually wrapped because that's easier to
do. However, to compensate for their procedural interface, people
often write another module on top of the raw Python bindings to expose
a public interface that appears more object-oriented, and make the
lower-level module internal/private.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sammo2828 at gmail.com  Fri Feb 13 23:01:22 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 13 Feb 2009 20:01:22 -0800 (PST)
Subject: String concatenation performance with +=
Message-ID: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>

String concatenation has been optimized since 2.3, so using += should
be fairly fast.

In my first test, I tried concatentating a 4096 byte string 1000 times
in the following code, and the result was indeed very fast (12.352 ms
on my machine).

import time
t = time.time()
mydata = ""
moredata = "A"*4096
for i in range(1000):
    mydata += moredata # 12.352 ms
print "%0.3f ms"%(1000*(time.time() - t))

However, I got a different result in my second test, which is
implemented in a class with a feed() method. This test took 4653.522
ms on my machine, which is 350x slower than the previous test!

class StringConcatTest:
    def __init__(self):
        self.mydata = ""

    def feed(self, moredata):
        self.mydata += moredata # 4653.522 ms

test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)
print "%0.3f ms"%(1000*(time.time() - t))

Note that I need to do something to mydata INSIDE the loop, so please
don't tell me to append moredata to a list and then use "".join after
the loop.

Why is the second test so much slower?


From benjamin at python.org  Fri Feb 13 23:12:29 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 14 Feb 2009 04:12:29 +0000 (UTC)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
Message-ID: <loom.20090214T040939-854@post.gmane.org>

Sammo <sammo2828 <at> gmail.com> writes:

> 
> String concatenation has been optimized since 2.3, so using += should
> be fairly fast.

This is implementation dependent and shouldn't be relied upon.

> 
> Note that I need to do something to mydata INSIDE the loop, so please
> don't tell me to append moredata to a list and then use "".join after
> the loop.

Then why not just mutate the list and then call "".join?

> 
> Why is the second test so much slower?

Probably several reasons:

1. Function call overhead is quite large compared to these simple operations.
2. You are resolving attribute names.






From benjamin.kaplan at case.edu  Fri Feb 13 23:46:12 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Fri, 13 Feb 2009 23:46:12 -0500
Subject: RELEASED Python 3.0.1
In-Reply-To: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
Message-ID: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>

On Fri, Feb 13, 2009 at 9:15 PM, Barry Warsaw <barry at python.org> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On behalf of the Python development team, I'm happy to announce the
> availability of Python 3.0.1, the first bug fix release of Python 3.0.
>  Version 3.0.1 fixes dozens of bugs reported since the release of Python 3.0
> on December 3rd, 2008.
>
> Python 3.0 represents a major milestone in Python's history.  This new
> version of the language is incompatible with the 2.x line of releases, while
> remaining true to BDFL Guido van Rossum's vision.
>
> For more information, links to documentation, and downloadable
> distributions, see the Python 3.0.1 release page:
>
>    http://www.python.org/download/releases/3.0.1/
>
> To report bugs in Python 3.0.1, please submit them to the issue tracker at:
>
>    http://bugs.python.org/
>
> Enjoy!
> Barry



Any chance of getting a Mac installer for this one?
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From steve at pearwood.info  Fri Feb 13 23:47:19 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 15:47:19 +1100
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<gn21fo$gnh$1@ger.gmane.org>
	<mailman.9438.1234474583.3487.python-list@python.org>
Message-ID: <01a64287$0$16735$c3e8da3@news.astraweb.com>

Martin wrote:

> Hi,
> 
> at first I wanted to file this under meta-discussions, but your lost
> paragraph got me thinking...
> 
> 2009/2/12 Christian Heimes <lists at cheimes.de>:
>> Nobody is going to stop you from creating a large bundle of useful
>> extensions as long as you follow the licenses. In fact lots of people
>> may appreciate a bundle. But the Python core package will always stay
>> small and agile.
> 
> How does "small and agile" work with "batteries included"?

Well, it certainly isn't agile without batteries.


>>From my point of view:
> 
> agile::
>  Would describe faster extension of the standard lib (rrd, yaml should
> IMHO already be in the standard lib). 

No, agile describes the language. It's easy to get things done *with*
Python. You're asking whether the Python-dev development process of getting
packages added to the standard library is agile. It absolutely is not, and
that is by design: python-dev doesn't want to fill the std lib up with
unnecessary, unused and buggy batteries just because one or two people
request them.

> I'm pretty sure other people 
> want to see other modules, but that's what agile + standard lib would
> mean for me. (Also I'm sometimes confused by the naming of modules but
> that's a different story)

The process for getting modules added to the std lib is on the Python
website.

http://www.python.org/dev/peps/pep-0002/

If you have a library you want added, go right ahead and make a PEP.


> small::
>  just the opposite of "batteries included"

Says who? Batteries can be small, and adding a few new batteries to the pile
doesn't necessarily make the pile significantly bigger.

Small means it doesn't have unnecessary batteries.


 
> My absolute favorite would be
> 
>  * python as just python (no standard lib)

Would be a toy.

>  * a (rather) fast moving standard lib available as an addon download

No no no, the std lib needs to be conservative, so that if you write code
that relies on the std lib, you can be confident that it will work
anywhere. The core language and std library are conservative, slowly
changing, so that developers have stability. You don't have to write code
like this:

if version == 2.5:
    code block
elif version == 2.5.1b:
    different code block
elif version == 2.5.1:
    still different code block
elif version == 2.5.2:
    if exists(module):
        code block
    else:
        something different again
elif version == 2.5.3:
     ...


If you want to live on the bleeding edge, with rapidly changing APIs and
libraries, they have a repository for that. It's called "the Internet".




-- 
Steven



From notvalid2 at sbcglobal.net  Fri Feb 13 23:58:33 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 20:58:33 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
Message-ID: <mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>

Scott David Daniels wrote:
> W. eWatson wrote:
>> Terry Reedy wrote:
>>> W. eWatson wrote:
>>>>  From Diez above.
>>>> What does *NOT* work is writing a Tkinter-based app in idle, and to 
>>>> run it
>>>> *FROM INSIDE* idle. Instead, open your explorer and double-click on the
>>>> pyhton-file your app is in. That's all that there is to it.
>>>>
>>>> So this is the absolute truth? No wiggle room? One can never use a 
>>>> Tkinter program with IDLE, and execute it successfully. So IDLE 
>>>> doesn't issue a standard warning that says, "Get out of here with 
>>>> your Tkinter program, it will fail when you try to run it here. You 
>>>> have entered Tkinter hell. Good-bye."
>>>
>>> Re-read my post about kids fighting to control a television.  Maybe 
>>> they work together, maybe they crash the TV.  Hard to predict.
>>>
>>> ***ANY*** Python program that tries to grab and control the same 
>>> resources that TK does may conflict with it.  There is no way that 
>>> IDLE can have a list of, for instance, all event-grabbing mainloop 
>>> programs.
>>>
>> OK, enough tinkering with the code and others matters on my end trying 
>> to find a work around. Somehow after much successful use of IDLE's 
>> execution facility, I've stepped on an invisible banana peel. I think 
>> it's evident that I'm not going around this problem easily with the 
>> IDLE execution attempts, and that another solution is required.
> That's correct, but you still don't understand _why_ it is correct.
> I suggest you re-read the thread and try to understand everything you
> are being told.
> 
>> First, I think somewhere up the thread someone suggested that Active 
>> pythonWin is not dependent upon Tk, correct? Therefore, it is immune 
>> from such problems, correct?
> 
> Wrong.  I was the one who said that ActiveState had a product to debug
> Python programs across a nertwork connection.  The product is _not_
> ActivePython (the freely distributed system), but rather the Komodo IDE,
> which does cost money.
I'm pretty sure it wasn't you, and had no relationship to what you brought 
up earlier several messages up the thread. There are other forums.
> 
>> Finally, we can probably agree that I can continue to use IDLE for 
>> editing and syntax checking, but to "guarantee" successful execution 
>> of the program, I can just double-click on the py file in my folder. 
>> Perhaps there is a better way than clicking on it in the folder. For 
>> example, putting it on the desktop. As I look at the folder, previous 
>> copies only differ by a digit, I can easily find myself executing an 
>> earlier version, differing as Dev4, to Dev5 at the end of each name.
> 
> OK, you are using the oldest and least useful revision control system,
> "rename and remember."  I'd suggest you get and use bazaar, but you'll
> just ask for shortcuts on how to use it without understanding what it does.
It works for me, and, frankly, I'm not interested in going to Linux, SunOS 
or other "revision systmes". These are way in my distant past, and the only 
reason I'm currently, and begrudgingly, once again writing programs is that 
the Python software program I am using is limited in its ability. I've 
finally, after 2-3 years of hoping someone else would do it, taken up the 
torch to add new features. Frankly, I'd rather be doing something else with 
my time.

And, yes, you are somewhat correct in your earlier assessment of my goals, 
the sooner this is over the better. You may not like my philosophy, but it 
serves me well at the moment, and I'm moving ahead nicely now.

As I recall from the old movie Desk Set, a conversation between their two 
characters regarding a puzzle he was about to give her as a test of her 
office abilities: Tracy cautions Hepburn, "Never assume!" before relating 
the famous "detective" problem. Never assume.

Nevertheless, thank you for your responses.
Be kind to your keyboard.

Cheers.
> 
> --Scott David Daniels
> Scott.Daniels at Acm.Org


-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Sat Feb 14 00:03:13 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 13 Feb 2009 21:03:13 -0800
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <mailman.9514.1234565868.3487.python-list@python.org>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>	<6viopfFkcasmU1@mid.uni-berlin.de>	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>	<mailman.9419.1234461666.3487.python-list@python.org>	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>	<mailman.9470.1234502626.3487.python-list@python.org>	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
Message-ID: <Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>

...
> How can it?  It's not IDLE's problem, it's yours.
> 
>> Finally, we can probably agree that I can continue to use IDLE for 
>> editing and syntax checking, but to "guarantee" successful execution 
>> of the program, I can just double-click on the py file in my folder. 
>> Perhaps there is a better way than clicking on it in the folder.
> 
> Typing at a command prompt.
> 
>> For example, putting it on the desktop.
> 
> This causes an extra file read as Windows indirects through the desktop
> link.  It's unlikely to be a noticeable delay at startup, but I'd
> hesitate to call it "better".
> 
>> As I look at the folder, previous copies only differ by a digit, I can 
>> easily find myself executing an earlier version, differing as Dev4, to 
>> Dev5 at the end of each name.
> 
> I'd suggest spending a while reading up on version control systems.
> 
See my response to Scott. Thanks for your reply.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From steve at pearwood.info  Sat Feb 14 00:37:01 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:37:01 +1100
Subject: Embarrasing questio
References: <ZKXkl.34048$Sp5.7221@text.news.virginmedia.com>
	<2dd78188-434d-4c24-bd73-2047105c6a89@q30g2000prq.googlegroups.com>
Message-ID: <01a64e2d$0$20655$c3e8da3@news.astraweb.com>

TechieInsights wrote:

> On Feb 12, 9:03?am, Catherine Heathcote
> <catherine.heathc... at gmail.com> wrote:
>> But I just cant find it. How do I do an or, as in c/c++'s ||? Just
>> trying to do something simple, the python equivilent of:
>>
>> if(i % 3 == 0 || i % 5 == 0)
>>
>> Thanks.
> 
> in 2.5 and above you can do
> if any(i%3 == 0, i%5 == 0)

[nitpick: you need an additional set of brackets inside the call to any]

I love it! A totally unnecessary creation of a tuple and a function call
instead of a straight-forward 'or' expression. Can we make this simple task
even more obfuscated?

not all( (i%3 != 0, i%5 !=0) )

Still not convoluted enough. 

all( (sum(int(c) for c in str(i))%3 in (1, 2), 
    str(i).endswith(chr(53)) - 1, 
    str(i).endswith(chr(48)) - 1) ) - 1

Hmmm... how can I get rid of that pesky %3?

all( (divmod( sum(int(c) for c in str(i)), 
    41^42)[1] in (1, 2), 
    str(i).endswith(chr(53)) - 1, 
    str(i).endswith(chr(48)) - 1) ) - 1

Okay, that makes my brain hurt. I think it will do.

:-)



-- 
Steven



From michele.simionato at gmail.com  Sat Feb 14 00:38:15 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 13 Feb 2009 21:38:15 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
Message-ID: <6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com>

On Feb 14, 12:56?am, Gustavo Narea <m... at gustavonarea.net> wrote:
> Hello, everybody.
>
> I have this signature-changing decorator
> <http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
> which I
> want to turn into a signature-preserving one. Here's my try
> <http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
> but I get
> this error:http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wra...
>
> What am I doing wrong? I think it looks like this example:http://pypi.python.org/pypi/decorator#async
>
> Thanks in advance.
>
> ? - Gustavo.
>
> PS: functols.wrap is not an option because my code has to work with
> Python 2.4+.

Difficult to see what is happening, since you have so many
dependencies. However, from the traceback I would say that
you are passing to the decorator a function with a __name__
attribute which is None. I would insert a call to pdb here

def __call__(self, func):
        import pdb; pdb.set_trace()
        return decorator(self.call, func)

and I would inspect func.__name__.

HTH,

                                 M.Simionato


From steve at pearwood.info  Sat Feb 14 00:41:09 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:41:09 +1100
Subject: A little bit else I would like to discuss
References: <7f4cd287-dad4-4605-8b96-5edfdacc3da2@a12g2000yqm.googlegroups.com>
	<mailman.9432.1234469717.3487.python-list@python.org>
	<3ee5cf15-27de-4ed2-ace3-9f08ab5a793d@t11g2000yqg.googlegroups.com>
Message-ID: <01a64f24$0$20669$c3e8da3@news.astraweb.com>

Damon wrote:

> Use Visual Studio to program a .net application using Windows Forms.
> Run it in Mono on Windows, or OS X, or Linux.
...
> Also, you can quibble whether it's Visual
> Studio that tries to address this, or the Mono effort.

There's no quibble. It's obviously Mono. How can you possible justify the
suggestion that it could be Visual Studio? That's rather like saying that
American electrical plugs fit perfectly into Australian power sockets
because there are adaptors.


-- 
Steven



From sammo2828 at gmail.com  Sat Feb 14 00:44:12 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 13 Feb 2009 21:44:12 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
Message-ID: <748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>

Okay, this is what I have tried for string concatenation:

1. Using += implemented using simple operations (12 ms)
2. Using += implemented inside a class (4000+ ms)
3. Using "".join implemented using simple operations (4000+ ms)
4. Using "".join implemented inside a class (4000+ ms)

On Feb 14, 3:12?pm, Benjamin Peterson <benja... at python.org> wrote:
> Sammo <sammo2828 <at> gmail.com> writes:
>
> > String concatenation has been optimized since 2.3, so using += should
> > be fairly fast.
>
> This is implementation dependent and shouldn't be relied upon.
>
> > Note that I need to do something to mydata INSIDE the loop, so please
> > don't tell me to append moredata to a list and then use "".join after
> > the loop.
>
> Then why not just mutate the list and then call "".join?

AFAIK, using list mutation and "".join only improves performance if
the "".join is executed outside of the loop. In fact, in Python 2.5.2,
using "".join inside the loop is actually much slower compared to my
original test, which concatenates using +=.

My original test with simple operations took 12 ms to run:

import time
t = time.time()
mydata = ""
moredata = "A"*4096
for i in range(1000):
    mydata += moredata # 12.352 ms
    # do some stuff to mydata
    # ...
print "%0.3f ms"%(1000*(time.time() - t))

New code modified to mutate the list, then call "".join now takes 4417
ms to run. This is much slower!

import time
t = time.time()
mydata = []
moredata = "A"*4096
for i in range(1000):
    mydata.append(moredata)
    mydata = ["".join(mydata)]
    # do some stuff to mydata
    # ...

Using list mutation and "".join, implemented in a class. This took
4434 ms to run, which is again much slower than the original test.
Note that it is about the same speed as using += implemented in a
class.

import time
moredata = "A"*4096
class StringConcatTest:
    def __init__(self):
        self.mydata = []

    def feed(self, moredata):
        self.mydata.append(moredata)
        self.mydata = ["".join(self.mydata)]
        # do some stuff to self.mydata
        # ...

test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)
print "%0.3f ms"%(1000*(time.time() - t))


> > Why is the second test so much slower?
>
> Probably several reasons:
>
> 1. Function call overhead is quite large compared to these simple operations.
> 2. You are resolving attribute names.

The main problem I need help with is how to improve the performance of
the code implemented in a class. It is currently 350x slower than the
first test using simple operations, so surely there's got to be a way.


From steve at pearwood.info  Sat Feb 14 00:47:57 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 16:47:57 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
Message-ID: <01a650bd$0$31512$c3e8da3@news.astraweb.com>

Benjamin Peterson wrote:

> Sammo <sammo2828 <at> gmail.com> writes:
> 
>> String concatenation has been optimized since 2.3, so using += should
>> be fairly fast.
> 
> This is implementation dependent and shouldn't be relied upon.

It's also a fairly simple optimization and really only applies to direct
object access, not items or attributes.

>>> Timer('s += "x"', 's = ""').repeat(number=100000)
[0.067316055297851562, 0.063985109329223633, 0.066659212112426758]

>>> Timer('s[0] += "x"', 's = [""]').repeat(number=100000)
[3.0495560169219971, 2.2938292026519775, 2.2914319038391113]

>>> Timer('s.s += "x"', 
... 'class K(object): pass \ns=K();s.s = ""').repeat(number=100000) 
[3.3624241352081299, 2.3346412181854248, 2.9846079349517822]



>> Note that I need to do something to mydata INSIDE the loop, so please
>> don't tell me to append moredata to a list and then use "".join after
>> the loop.
> 
> Then why not just mutate the list and then call "".join?

Yes, there almost certainly is a way to avoid the repeated concatenation.


>> Why is the second test so much slower?
> 
> Probably several reasons:
> 
> 1. Function call overhead is quite large compared to these simple
> operations. 2. You are resolving attribute names.

3. Because the optimization isn't applied in this case.


-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:06:02 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:06:02 +1100
Subject: Avoiding argument checking in recursive calls
References: <pan.2009.02.11.01.58.09@REMOVE.THIS.cybersource.com.au>	<7xeiy52zfl.fsf@ruckus.brouhaha.com>	<mailman.9320.1234344687.3487.python-list@python.org>
	<pan.2009.02.12.06.13.39@REMOVE.THIS.cybersource.com.au>
	<mailman.9413.1234459492.3487.python-list@python.org>
Message-ID: <01a654fa$0$20662$c3e8da3@news.astraweb.com>

Terry Reedy wrote:

> Steven D'Aprano wrote:
>> On Wed, 11 Feb 2009 04:31:10 -0500, Terry Reedy wrote:
>> 
>>>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>> def fact(n):
>>>>>     if n < 0: raise ValueError
>>>>>     if n = 0: return 1
>>>>>     return fact(n-1)*n
>>>>>
>>>>> At the risk of premature optimization, I wonder if there is an idiom
>>>>> for avoiding the unnecessary test for n <= 0 in the subsequent
>>>>> recursive calls?
>>> Reverse the test order
>>>
>>> def fact(n):
>>>      if n > 0: return fact(n-1)*n
>>>      if n == 0: return 1
>>>      raise ValueError
>>>
>>> You must test recursive versus terminal case every call in any case.
>>> Nearly always, the first test passes and second is not done. You only
>>> test n==0 once, either to terminate or raise exception. This works for
>>> any integral value and catches non-integral values. (There is some delay
>>> for that, but only bad calls are penalized.)
>> 
>> Nice try, but in fact no.
> 
> I meant non-integral numbers.  Others inputs are outside the usual spec
> for fact().

I thought I had made it clear that fact() was just an illustration of a
recursive function, and the test n < 0 was just a stand-in for a more
expensive test. It was toy example to illustrate a general question.
Perhaps I could have made it more obvious with a less concrete example.
Sorry for the confusion.


> You asked about "an idiom for avoiding the unnecessary test 
> for n <= 0 in the subsequent recursive calls?" and I gave you that.  You
> should have thanked me.

I did thank everybody who responded. That included you. I do appreciate your
suggestions, even if I ultimately choose to do something else.


[...]
>> You're relying on arbitrary ordering of types in Python 2.x,
> 
> No I'm not.  I don't even know what you mean by that claim.

What I understood was that you expected fact(some_arbitrary_object) to raise
a ValueError. This works if some_arbitrary_object happens to be ordered
less than 0, which only works at all because of the specific arbitrary
ordering of types in Python 2.x. In Python 3 it won't work at all.

>> and of course in Python 3 that fails altogether.
> 
> In 3.0, which is what I use, the comparison 'n>0' raises an exception
> for non-numbers, as it should.  To me, that is success.  What else would
> you want?

I might want not to expose exceptions from the implementation, and instead
raise my own exception. For fact(), I might choose to do what you did, but
for a more complex test, arbitrary objects might fail anywhere with
potentially misleading error messages.

It's a perfectly legitimate approach to let unexpected objects fail in
unexpected ways. The advantage is that it's nice and lightweight. But it's
also a legitimate approach to have a little more control over what
exceptions are raised.



-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:08:58 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:08:58 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<01a650bd$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <01a655a9$0$20662$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:

> Benjamin Peterson wrote:
> 
>> Sammo <sammo2828 <at> gmail.com> writes:
>> 
>>> String concatenation has been optimized since 2.3, so using += should
>>> be fairly fast.
>> 
>> This is implementation dependent and shouldn't be relied upon.
> 
> It's also a fairly simple optimization and really only applies to direct
> object access, not items or attributes.
> 
>>>> Timer('s += "x"', 's = ""').repeat(number=100000)
> [0.067316055297851562, 0.063985109329223633, 0.066659212112426758]

Oops, sorry, I should have said... Timer is timeit.Timer.


-- 
Steven



From steve at pearwood.info  Sat Feb 14 01:33:21 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 17:33:21 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>
Message-ID: <01a65b61$0$30497$c3e8da3@news.astraweb.com>

Sammo wrote:

> Okay, this is what I have tried for string concatenation:
> 
> 1. Using += implemented using simple operations (12 ms)
> 2. Using += implemented inside a class (4000+ ms)
> 3. Using "".join implemented using simple operations (4000+ ms)
> 4. Using "".join implemented inside a class (4000+ ms)


I think you're doing more work than you need to. Here are my results:

>>> def join_test():
...     L = []
...     block = "abcdefghijklmnopqrstuvwxyz"*1000
...     for i in xrange(1000):
...             L.append(block)
...     return ''.join(L)
... 
>>> def concat_test():
...     s = ""
...     block = "abcdefghijklmnopqrstuvwxyz"*1000
...     for i in xrange(1000):
...             s += block
...     return s
... 
>>> assert join_test() == concat_test()
>>>
>>> from timeit import Timer
>>> Timer('concat_test()', 
... 'from __main__ import concat_test').repeat(number=100) 
[5.397799015045166, 4.3106229305267334, 4.3492171764373779]
>>> Timer('join_test()', 
... 'from __main__ import join_test').repeat(number=100) 
[4.5378072261810303, 3.9887290000915527, 3.919511079788208]


The join() idiom is slightly faster than repeated concatenation, even with
the optimization. If you're not seeing that result, you need to consider
what extra work you're doing that you don't need to.


>> Then why not just mutate the list and then call "".join?
> 
> AFAIK, using list mutation and "".join only improves performance if
> the "".join is executed outside of the loop. 

Naturally. If you needlessly join over and over again, instead of delaying
until the end, then you might as well do string concatenation without the
optimization.

join() isn't some magical function that makes your bugs go away. You have to
use it sensibly. What you've done is a variant of Shlemiel the
road-painter's algorithm:

http://www.joelonsoftware.com/articles/fog0000000319.html



Perhaps you have to repeatedly do work on the *temporary* results in between
loops? Something like this toy example?

s = ""
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    s += block
    # do something with the partially concatenated string
    print "partial length is", len(s)
# all finished
do_something(s)

You've written that using join:

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the partially concatenated string
    L = [ ''.join(L) ]
    print "partial length is", len(L[0])
# all finished
s = ''.join(L)
do_something(s)

Okay, but we can re-write that more sensibly:

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the partially concatenated string
    print "partial length is", sum(len(item) for item in L)
# all finished
s = ''.join(L)
do_something(s)

There's still a Shlemiel algorithm in there, but it's executed in fast C
instead of slow Python and it doesn't involve copying large blocks of
memory, only walking them, so you won't notice as much. Can we be smarter?

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
partial_length = 0
for i in xrange(1000):
    L.append(block)
    partial_length += len(block)
    # do something with the partially concatenated string
    print "partial length is", partial_length
# all finished
s = ''.join(L)
do_something(s)


Naturally this is a toy example, but I think it illustrates one technique
for avoiding turning an O(N) algorithm into an O(N**2) algorithm. 

Good luck!


-- 
Steven



From bj_666 at gmx.net  Sat Feb 14 01:39:02 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 14 Feb 2009 06:39:02 GMT
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
	<mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>
Message-ID: <6vn786Fl3f4sU1@mid.uni-berlin.de>

On Fri, 13 Feb 2009 20:58:33 -0800, W. eWatson wrote:

> Scott David Daniels wrote:
>> OK, you are using the oldest and least useful revision control system,
>> "rename and remember."  I'd suggest you get and use bazaar, but you'll
>> just ask for shortcuts on how to use it without understanding what it
>> does.
> It works for me, and, frankly, I'm not interested in going to Linux,
> SunOS or other "revision systmes".

Linux and SunOS are *operating systems*, something completely different 
from *revision control systems*.

A revision or version control system (VCS) lets you record the evolution 
of your software.  You can tag versions with symbolic names like "Dev4" 
or "Release-1.0" and can ask the VCS for a copy of the sources with a 
given tag or even date.

Ciao,
	Marc 'BlackJack' Rintsch


From eliben at gmail.com  Sat Feb 14 01:47:37 2009
From: eliben at gmail.com (eliben)
Date: Fri, 13 Feb 2009 22:47:37 -0800 (PST)
Subject: data structure for ASTs in Python-written parsers
Message-ID: <bce9b53d-888b-4639-b3cb-076ee6b281c2@l16g2000yqo.googlegroups.com>

Hello,

The Python interpreter uses ASDL (http://www.cs.princeton.edu/~danwang/
Papers/dsl97/dsl97.html) to describe the AST resulting from parsing.
In previous versions, there was another AST being used by the compiler
module - ast.txt and astgen.py in tools/compiler in the Python 2.5
source. However, as far as I understand this has been discontinued in
later Pythons.

I'm writing parsers in pure Python (with PLY), and wonder about the
best representation to use for the AST. So far I've been using a self-
cooked solution similar to ast.txt/astgen.py, but I was wondering
about ASDL.

Looking at it closely, it seems to me that ASDL is much more suitable
for statically-typed languages like C and Java than the duck-typed
Python. The assignment of types of nodes seems superfluous when "real"
Node classes can be used. Wherever dispatching is needed on the type
enum, in Python we can dispatch on isinstance(), and traversal using
reflection (automatic AST walkers) is possible in Python on the simple
representation, while ASDL just adds another complexity level.

Does this make sense? I realize Python itself uses ASDL because its
parser is coded in C. But what would you prefer as a representation
for parsers written *in* Python?

Thanks in advance


From steve at pearwood.info  Sat Feb 14 02:19:17 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sat, 14 Feb 2009 18:19:17 +1100
Subject: doctest fails to see tests in decorated functions
Message-ID: <01a66625$0$21875$c3e8da3@news.astraweb.com>

I've just spotted a bug in doctest that it fails to see tests inside
decorated functions. It's been reported before:

http://bugs.python.org/issue1108

but the patch submitted doesn't work for me. I have a test script on the
page demonstrating the problem. Can anyone give me some clues as to a
work-around? I tried adding objects to __test__ but testmod() still failed
to pick up their tests.


if __name__ == '__main__':
    import doctest
    import types
    __test__ = {}
    allowed = [str, types.FunctionType, 
        types.ClassType, types.GeneratorType,
        types.MethodType, types.UnboundMethodType]
    for name in dir():
        obj = vars()[name]
        if type(obj) in allowed:
            __test__[name] = obj
    doctest.testmod()



-- 
Steven



From martijnsteenwijk at gmail.com  Sat Feb 14 03:04:46 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Sat, 14 Feb 2009 00:04:46 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
Message-ID: <c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>

On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
> martijnsteenw... at gmail.com wrote:
> > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > express, but unfortunately this doesn't change anything in running the
> > setup file. Unfortunately, still no pyd file is produced...
>
> > Did I something wrong?
>
> Yeah, you installed the C# environment. Python is written in C, so you
> have to get Visual Studio C++ 2008. However a recent version of MinGW32
> is sufficient to build most extensions.
>
> Christian

Hi Christian,

Thanks for your reply. In mean time, I discovered the C++ thing
already ;-).
Now I installed MinGW, but still the same happens. If I run the setup
file, the same output comes on the command line and no pyd file is
created... GRRR

Any suggestions?

Martijn


From Nicolas.Thiery at u-psud.fr  Sat Feb 14 03:19:53 2009
From: Nicolas.Thiery at u-psud.fr (=?ISO-8859-1?Q?Nicolas_M=2E_Thi=E9ry?=)
Date: Sat, 14 Feb 2009 00:19:53 -0800 (PST)
Subject: Pickling classes (not class instances)
References: <582b45b4-ed93-4a05-9c7b-7f72da34861d@r36g2000prf.googlegroups.com>
Message-ID: <aa85e37a-e2c7-4b05-b19d-6584e7920ead@l16g2000yqo.googlegroups.com>

         Dear python developers,

I got no answer to my previous post on this thread "Pickling classes
(not class instances)".
This issue is a show stopper for our project. Any suggestion for where
to ask?

Thanks in advance!

Best regards,
					Nicolas

> Purpose of this e-mail:
> -----------------------
>
> How to customize how a class (not an instance of a class!!!) is
> pickled?
>
> Example:
> ==============================================================================
> class metaclass(type):
>     def __new__(mcs, name, bases, dict):
>         print " running metaclass.__new__"
>         return type.__new__(mcs, name, bases, dict)
>     #
>     def __reduce_class__(self):
>         print "reducing a class"
>         # do the real work
>
> c = metaclass("foo", (object,), dict())
>
> import copy_reg
> copy_reg.pickle(metaclass, metaclass.__reduce_class__)
>
> pickle.dumps(c)
> ---------------------------------------------------------------------------
> PicklingError                             Traceback (most recent call
> last)
> ...
> PicklingError: Can't pickle <class '__main__.foo'>: it's not found as
> __main__.foo
> ==============================================================================
>
> Context:
> --------
>
> I am working on the Sage project (www.sagemath.org), and more
> precisely on the category infrastructure. The code is building lots of
> classes on the fly by composing preexisting classes by inheritance
> (for the curious, see the doc of the class Category inhttp://sage.math.washington.edu:2144/file/1567cea09170/categories-nt....).
>
> Since those classes are built on the fly, they cannot be pickled with
> the default mechanism of name lookup. A proper pickling would be to
> rebuild the class anew. Nothing problematic, except for the question
> above.
>
> Discussion:
> -----------
>
> It sounds like copy_reg would be the natural way to go (as in the
> example above). However, its documentation suggests that it explicitly
> is not intended for pickling classes, e.g. first paragraph of:
>
> http://docs.python.org/library/copy_reg.html#module-copy_reg
>
> is:
>
>   The copy_reg module provides support for the pickle and cPickle
>   modules. The copy module is likely to use this in the future as
>   well.  It provides configuration information about object
>   constructors which are not classes. Such constructors may be factory
>   functions or class instances.
>
> And indeed, looking up at the code of pickle (l. 289-299 of pickle.py)
> (and similarly in cpickle), the copy-reg dispatch is explicit bypassed
> for metaclasses:
>
>         # Check for a class with a custom metaclass; treat as regular
> class
>         try:
>             issc = issubclass(t, TypeType)
>         except TypeError: # t is not a class (old Boost; see SF
> #502085)
>             issc = 0
>         if issc:
>             self.save_global(obj)
>             return
>
>         # Check copy_reg.dispatch_table
>         reduce = dispatch_table.get(t)
>
> Which causes the failure above.
>
> Is there a specific reason for this restriction?
>
> Would it be thinkable to move up the copy reg dispatch before the
> metaclass treatment in pickle and cPickle? I did it locally, and it
> fixed my problem.
>
> If not, what would be the right way to achieve this?
>
> Many thanks in advance!
>
> Best regards,
>                                 Nicolas
> --
> Nicolas M. Thi?ry "Isil" <nthi... at users.sf.net>http://Nicolas.Thiery.name/



From martijnsteenwijk at gmail.com  Sat Feb 14 03:31:59 2009
From: martijnsteenwijk at gmail.com (martijnsteenwijk at gmail.com)
Date: Sat, 14 Feb 2009 00:31:59 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
	<c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>
Message-ID: <3d42c023-07b5-4216-a217-d67cff580422@h20g2000yqn.googlegroups.com>

On 14 feb, 09:04, martijnsteenw... at gmail.com wrote:
> On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
>
> > martijnsteenw... at gmail.com wrote:
> > > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > > express, but unfortunately this doesn't change anything in running the
> > > setup file. Unfortunately, still no pyd file is produced...
>
> > > Did I something wrong?
>
> > Yeah, you installed the C# environment. Python is written in C, so you
> > have to get Visual Studio C++ 2008. However a recent version of MinGW32
> > is sufficient to build most extensions.
>
> > Christian
>
> Hi Christian,
>
> Thanks for your reply. In mean time, I discovered the C++ thing
> already ;-).
> Now I installed MinGW, but still the same happens. If I run the setup
> file, the same output comes on the command line and no pyd file is
> created... GRRR
>
> Any suggestions?
>
> Martijn

Hmmm, problem fixed :-)
Downloaded the C++ compiler, runned the Visual Studio 2008 command
prompt and it works!


From martin at v.loewis.de  Sat Feb 14 03:55:47 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 14 Feb 2009 09:55:47 +0100
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <49968713.4080705@v.loewis.de>

> Any chance of getting a Mac installer for this one?

Chances are non-zero, yes.

Martin


From castironpi at gmail.com  Sat Feb 14 04:26:20 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sat, 14 Feb 2009 01:26:20 -0800 (PST)
Subject: Pickling classes (not class instances)
References: <582b45b4-ed93-4a05-9c7b-7f72da34861d@r36g2000prf.googlegroups.com>
	<aa85e37a-e2c7-4b05-b19d-6584e7920ead@l16g2000yqo.googlegroups.com>
Message-ID: <f9547c14-cb31-43cb-82b1-351f02d56136@s36g2000vbp.googlegroups.com>

On Feb 14, 2:19?am, Nicolas M. Thi?ry <Nicolas.Thi... at u-psud.fr>
wrote:
> ? ? ? ? ?Dear python developers,
>
> I got no answer to my previous post on this thread "Pickling classes
> (not class instances)".
> This issue is a show stopper for our project. Any suggestion for where
> to ask?
snip to
http://groups.google.com/group/comp.lang.python/browse_thread/thread/66c282afc04aa39c/4d9304aa0cc791c2#4d9304aa0cc791c2
> > How to customize how a class (not an instance of a class!!!) is
> > pickled?
snip
> > Is there a specific reason for this restriction?
>
> > Would it be thinkable to move up the copy reg dispatch before the
> > metaclass treatment in pickle and cPickle? I did it locally, and it
> > fixed my problem.
>
> > If not, what would be the right way to achieve this?

Hi Nicolas,

I couldn't get yours to work.  I also tried defining '__reduce__' and
'__getstate__' in the metaclass; they didn't work either.

Can you just subclass Pickler, and override the 'save' method?

> > Is there a specific reason for this restriction?

It sounds very odd.  I'm not a core dev, so I can't say.

I also tried defining '__subclasshook__' to convince 'metaclass' it is
not a subclass of 'type'.  It didn't work, but 'register' was not
working the way I wanted.

Perhaps you could define your own 'custom_type' type, which looks and
acts just like type, but just doesn't pass the 'subclass' test.  It
may be as simple as just cutting-and-pasting the TypeObject definition
from the core.




From __peter__ at web.de  Sat Feb 14 04:31:38 2009
From: __peter__ at web.de (Peter Otten)
Date: Sat, 14 Feb 2009 10:31:38 +0100
Subject: Levenshtein word comparison -performance issue
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<mailman.9482.1234521740.3487.python-list@python.org>
Message-ID: <gn631q$l5b$02$1@news.t-online.com>

Gabriel Genellina wrote:

> En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>
> escribi?:
> 
>> I need some help.
>> I tried to find top n(eg. 5) similar words for a given word, from a
>> dictionary of 50,000 words.
>> I used python-levenshtein module,and sample code is as follow.
>>
>> def foo(searchword):
>>     disdict={}
>>     for word in self.dictionary-words:
>>                    distance=Levenshtein.ratio(searchword,word)
>>                    disdict[word]=distance
>>     """
>>      sort the disdict dictionary by values in descending order
>>     """
>>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
>>
>>     return similarwords[:5]
> 
> You may replace the last steps (sort + slice top 5) by heapq.nlargest - at
> least you won't waste time sorting 49995 irrelevant words...
> Anyway you should measure the time taken by the first part (Levenshtein),
> it may be the most demanding. I think there is a C extension for this,
> should be much faster than pure Python calculations.
> 

[I didn't see the original post]

You can use the distance instead of the ratio and put the words into bins of
the same length. Then if you find enough words with a distance <= 1 in the
bin with the same length as the search word you can stop looking.

You might be able to generalize this approach to other properties that are
fast to calculate and guarantee a minimum distance, e. g. set(word).

Peter


From samslists at gmail.com  Sat Feb 14 04:51:40 2009
From: samslists at gmail.com (Sam)
Date: Sat, 14 Feb 2009 01:51:40 -0800 (PST)
Subject: codecs.open and buffering modes...
References: <56a55b5c-ca64-4c84-a8a8-3912af384e4c@f40g2000pri.googlegroups.com>
Message-ID: <b1bf9217-cbdd-4ef0-8af2-16bf9b99507b@r15g2000prh.googlegroups.com>

Hmmm...no one knows the reason for the discrepancy?  Should I post on
the developers' list to see if anyone knows?

Thanks

On Feb 9, 6:19?pm, Sam <samsli... at gmail.com> wrote:
> codecs.open defaults to line buffering. ?But open defaults to using
> the system buffer size. ?Why the discrepancy? ?Is it different for a
> reason?
>
> How do these choices affect performance? ?(Particularly under Linux).
>
> Thanks



From vriolk at gmail.com  Sat Feb 14 05:08:38 2009
From: vriolk at gmail.com (coldpizza)
Date: Sat, 14 Feb 2009 02:08:38 -0800 (PST)
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
Message-ID: <70d53ba1-7451-413a-807f-3e1021cdf8bb@d32g2000yqe.googlegroups.com>

You should have a look at twill:
   http://twill.idyll.org

It seems to be no longer maintained, but will probably do most of what
you expect. And it is built on top of mechanize.


On Feb 13, 4:04?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> I'd like to do some web automation with python 2.5
> - https:
> - a cookiejar
> - some forms to be filled in
>
> what is the best set of modules.
>
> As far as I understood, there is httplib, but it seems (if I understood
> well) to be incoompatible with cookielib
>
> I'm a newcomer to webautomation with python and would be thankful for
> good suggestions.
>
> I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> forgot the name) to handle parsing and filling in Forms.
>
> thanks in advance for any pointers opinions
>
> N



From vriolk at gmail.com  Sat Feb 14 05:16:41 2009
From: vriolk at gmail.com (coldpizza)
Date: Sat, 14 Feb 2009 02:16:41 -0800 (PST)
Subject: best set of modules for web automation without javascript
References: <49957df1$0$15145$426a74cc@news.free.fr>
	<mailman.9503.1234548080.3487.python-list@python.org>
Message-ID: <425241d1-6e51-4638-af07-9360cc5d1b24@s20g2000yqh.googlegroups.com>

And btw, Selenium scripts can be exported to Python and run under
Selenium Remote Control server.

I'd say this is the most flexible and advanced way to do webtesting,
since you can have a single script that runs with many browsers
(opera, firefox, ie, etc), and on many platforms.

And combined with HTMLTestRunner you can get beautiful test reports.

On Feb 13, 8:01?pm, Matias Surdi <matiassu... at gmail.com> wrote:
> You should give a look to Selenium. It's great.
>
> http://www.openqa.org
>
>
>
> News123 wrote:
> > Hi,
>
> > I'd like to do some web automation with python 2.5
> > - https:
> > - a cookiejar
> > - some forms to be filled in
>
> > what is the best set of modules.
>
> > As far as I understood, there is httplib, but it seems (if I understood
> > well) to be incoompatible with cookielib
>
> > I'm a newcomer to webautomation with python and would be thankful for
> > good suggestions.
>
> > I used so far perl with LWP::UserAgent HTTP::Cookies and some module (I
> > forgot the name) to handle parsing and filling in Forms.
>
> > thanks in advance for any pointers opinions
>
> > N
> > --
> >http://mail.python.org/mailman/listinfo/python-list



From ssj4_dave at hotmail.com  Sat Feb 14 06:35:56 2009
From: ssj4_dave at hotmail.com (DLitgo)
Date: Sat, 14 Feb 2009 03:35:56 -0800 (PST)
Subject: Thank you, Tkinter. (easy to use)
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>
	<766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>
Message-ID: <c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>

On Feb 12, 12:39?am, r <rt8... at gmail.com> wrote:
> Hello,
>
> Tkinter is a great GUI toolkit, for what it lacks in prettiness it
> more than makes up for in simple and quick GUI building. I think this
> is the main reason Tkinter continues to be Python's built-in GUI
> toolkit. It is a great place to start for those with no GUI
> experience. Sure it will never be as rich as wxPython or the like, but
> that is not what Tkinter is made for.
>
> I use Tkinter for all my tools that need a UI, and others as well. The
> only complaint i have is the poor support for image types i really
> wish there where at least support for one good image like jpg, png,
> and full color bitmaps.The canvas widget could also use a little more
> functionality, but hey maybe one day i will have time to polish it up
> a bit.

There is the Python Image Library (PIL), but when I tried to install
it I of course had to install the JPEG package as well which didn't
install correctly. After trying several times to install it (the JPEG
package that is, PIL installed fine, but I only wanted it for the
extra image support) I just gave up.

Does anyone know of a quick and easy install for PIL + JPEG for Mac OS
X (10.5)?


From greg.ewing at canterbury.ac.nz  Sat Feb 14 06:50:04 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sun, 15 Feb 2009 00:50:04 +1300
Subject: ANN: SuPy 1.2
Message-ID: <mailman.9527.1234615404.3487.python-announce-list@python.org>

SuPy 1.2 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Ruby object and class wrappers now have __class__ and __bases__ attributes
   that return the right things. As a consequence, isinstance() and
   issubclass() also work properly on Ruby objects.

- UI module made available to Python.

- Data in a module can be preserved across a Py.refresh() by giving the
   module a __keep__ attribute holding a sequence of names to preserve.

- Added a utility module to assist with managing menu items.

- Fixed some bugs in the block-passing mechanism.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From sammo2828 at gmail.com  Sat Feb 14 07:00:39 2009
From: sammo2828 at gmail.com (Sammo)
Date: Sat, 14 Feb 2009 04:00:39 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<01a650bd$0$31512$c3e8da3@news.astraweb.com>
Message-ID: <56a6c7a9-fae7-4368-8f59-2aa7b5c8df8c@z6g2000pre.googlegroups.com>

On Feb 14, 4:47?pm, Steven D'Aprano <st... at pearwood.info> wrote:
> > Sammo <sammo2828 <at> gmail.com> writes:
> >> String concatenation has been optimized since 2.3, so using += should
> >> be fairly fast.
>
> > This is implementation dependent and shouldn't be relied upon.
>
> It's also a fairly simple optimization and really only applies to direct
> object access, not items or attributes.
>
> >> Why is the second test so much slower?
>
> > Probably several reasons:
>
> > 1. Function call overhead is quite large compared to these simple
> > operations. 2. You are resolving attribute names.
>
> 3. Because the optimization isn't applied in this case.

Thanks Steven -- that's the answer I was looking for. The += string
concatenation optimization only applies to local variables. In my
case, I incorrectly assumed it applied to attributes.

Can you point me to any references regarding the limitations of the
optimization? I guess it's another Python idiom that's documented
somewhere ...


From sammo2828 at gmail.com  Sat Feb 14 07:15:19 2009
From: sammo2828 at gmail.com (Sammo)
Date: Sat, 14 Feb 2009 04:15:19 -0800 (PST)
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<mailman.9524.1234584759.3487.python-list@python.org>
	<748284e0-7e93-4a7a-9511-b6a5e5aaa5ab@w1g2000prk.googlegroups.com>
	<01a65b61$0$30497$c3e8da3@news.astraweb.com>
Message-ID: <69fe8286-a6f9-4cc5-976e-405280e4edb0@z6g2000pre.googlegroups.com>

On Feb 14, 5:33?pm, Steven D'Aprano <st... at pearwood.info> wrote:
> > AFAIK, using list mutation and "".join only improves performance if
> > the "".join is executed outside of the loop.
>
> Naturally. If you needlessly join over and over again, instead of delaying
> until the end, then you might as well do string concatenation without the
> optimization.
>
> join() isn't some magical function that makes your bugs go away. You have to
> use it sensibly. What you've done is a variant of Shlemiel the
> road-painter's algorithm:
>
> http://www.joelonsoftware.com/articles/fog0000000319.html
>
> Perhaps you have to repeatedly do work on the *temporary* results in between
> loops? Something like this toy example?
>
> s = ""
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? s += block
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", len(s)
> # all finished
> do_something(s)
>
> You've written that using join:
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? # do something with the partially concatenated string
> ? ? L = [ ''.join(L) ]
> ? ? print "partial length is", len(L[0])
> # all finished
> s = ''.join(L)
> do_something(s)
>
> Okay, but we can re-write that more sensibly:
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", sum(len(item) for item in L)
> # all finished
> s = ''.join(L)
> do_something(s)
>
> There's still a Shlemiel algorithm in there, but it's executed in fast C
> instead of slow Python and it doesn't involve copying large blocks of
> memory, only walking them, so you won't notice as much. Can we be smarter?
>
> L = []
> block = "abcdefghijklmnopqrstuvwxyz"*1000
> partial_length = 0
> for i in xrange(1000):
> ? ? L.append(block)
> ? ? partial_length += len(block)
> ? ? # do something with the partially concatenated string
> ? ? print "partial length is", partial_length
> # all finished
> s = ''.join(L)
> do_something(s)
>
> Naturally this is a toy example, but I think it illustrates one technique
> for avoiding turning an O(N) algorithm into an O(N**2) algorithm.

So even though I can't delay the "".join operation until after the
loop, I can still improve performance by reducing the length of
"".join operations inside the loop. In my case, I need to temporarily
work on the latest two blocks only.

L = []
block = "abcdefghijklmnopqrstuvwxyz"*1000
for i in xrange(1000):
    L.append(block)
    # do something with the latest two blocks
    tmp = "".join(L[-2:])
# all finished
s = ''.join(L)
do_something(s)

Unfortunately, the downside is that the code becomes more difficult to
read compared to using the obvious +=. If only the optimization worked
for attributes ...


From me at gustavonarea.net  Sat Feb 14 07:30:08 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Sat, 14 Feb 2009 04:30:08 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com>
Message-ID: <2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com>

On Feb 14, 6:38 am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 14, 12:56 am, Gustavo Narea <m... at gustavonarea.net> wrote:
>
>
>
> > Hello, everybody.
>
> > I have this signature-changing decorator
> > <http://paste.chrisarndt.de/paste/15aac02a90094a41a13a1b9b85a14dd6>
> > which I
> > want to turn into a signature-preserving one. Here's my try
> > <http://paste.chrisarndt.de/paste/d0f835c00f824437bf4a0898f8020fc8>,
> > but I get
> > this error:http://paste.chrisarndt.de/paste/33e06be6e6d74e49b05c45534dfcc9fe?wra...
>
> > What am I doing wrong? I think it looks like this example:http://pypi.python.org/pypi/decorator#async
>
> > Thanks in advance.
>
> >   - Gustavo.
>
> > PS: functols.wrap is not an option because my code has to work with
> > Python 2.4+.
>
> Difficult to see what is happening, since you have so many
> dependencies. However, from the traceback I would say that
> you are passing to the decorator a function with a __name__
> attribute which is None. I would insert a call to pdb here
>
> def __call__(self, func):
>         import pdb; pdb.set_trace()
>         return decorator(self.call, func)
>
> and I would inspect func.__name__.
>
> HTH,
>
>                                  M.Simionato

Thanks for your response, Michele.

This is what I get:
"""
(Pdb) func.__name__
'greetings'
(Pdb) func.__dict__
{}
(Pdb) func.__module__
'pylonsproject.controllers.root'
"""

Which seems correct to me.

By the way, I forgot to mention that what is decorated is an instance
method. I don't know if that would change something.

Thanks in advance.

  - Gustavo.


From user at domain.invalid  Sat Feb 14 07:33:46 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 13:33:46 +0100
Subject: encrypting lines from file with md5 module doesn't work?
Message-ID: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>

Hi,
I need some help with my script. I hope someone can show me the right
direction or at least explain to me what did I wrong?

I write a small script that read lines from plain text file and encrypt
each lines using md5 module. I have a small word list that contain 2000+
words, 1 word/line. Using the code below, I can save the output to
another file to use it with john the ripper (http://www.openwall.com).

Here is the part that annoys me, john recognize the output as des and
not as md5. Using the original wordlist, I tried to crack the list but
nothing has come up after waiting for almost 9 hours. Can someone please
tell me what did I wrong? Why john don't recognize the output as md5?
I'm using python 2.5.1 and I'm python noob and also don't have any
knowledge about encryption.

----------------code------------------------
import sys, md5

f = open(sys.argv[1])
obj = md5.new()

for line in f:
        if line[-1:] == '\n':
                text = line[:-1]
        obj.update(text),
        print text + ':' + obj.hexdigest()

f.close()


---------------result-----------------------
000000:670b14728ad9902aecba32e22fa4f6bd
00000000:c47532bbb1e2883c902071591ae1ec9b
111111:bf874003f752e86e6d6ba6d6df1f24a2
11111111:65a89de3000110bf37bcafdbd33df55a
121212:38a8eeb4dfb0f86aefea908365817c15
123123:f226a65a908909b83aed92661897d0c9


Thanks in advance


From zaheer.agadi at gmail.com  Sat Feb 14 07:37:57 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 14 Feb 2009 04:37:57 -0800 (PST)
Subject: Reading a file
Message-ID: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>

Hi

How do i read  a file in Python and search a particular pattern
like I have a file char.txt  which has

Mango=sweet
Sky=blue

I want to get the strings sweet and blue,How to do this..?

Thanks


From berend at dotmpe.com  Sat Feb 14 08:18:37 2009
From: berend at dotmpe.com (Berend van Berkum)
Date: Sat, 14 Feb 2009 14:18:37 +0100
Subject: sgmllib parser keeps old tag data?
In-Reply-To: <499594C0.9020509@mrabarnett.plus.com>
References: <20090213135803.GB2168@iris.furrow.ath.cx>
	<4995844C.7080104@mrabarnett.plus.com>
	<20090213145101.GC2168@iris.furrow.ath.cx>
	<499594C0.9020509@mrabarnett.plus.com>
Message-ID: <20090214131837.GB3799@iris.furrow.ath.cx>

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On Fri, Feb 13, 2009 at 03:41:52PM +0000, MRAB wrote:
> Berend van Berkum wrote:
> >Yes.. tested that and SGMLParser won't let me override __init__, 
> >(SGMLParser vars are uninitialized even with sgmllib.SGMLParser(self) 
> >call).
> 
> OK, so SGMLParser needs to be initialised:
> 
> 	def __init__(self):
> 		sgmllib.SGMLParser.__init__(self)
> 		self.content = ''
> 		self.markup = []
> 		self.span_stack = []

argh.. forgot about old-style supercall syntax
used sgmllib.SGMLParser(self), did not investigate the error
gonna be ashamed for a while now..

- -- 
 web, http://dotmpe.com                      ()    ASCII Ribbon
 email, berend.van.berkum at gmail.com          /\
 icq, 26727647;  irc, berend/mpe at irc.oftc.net

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From google at mrabarnett.plus.com  Sat Feb 14 09:14:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 14:14:59 +0000
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
Message-ID: <4996D1E3.9040304@mrabarnett.plus.com>

Canned wrote:
> Hi,
> I need some help with my script. I hope someone can show me the right
> direction or at least explain to me what did I wrong?
> 
> I write a small script that read lines from plain text file and encrypt
> each lines using md5 module. I have a small word list that contain 2000+
> words, 1 word/line. Using the code below, I can save the output to
> another file to use it with john the ripper (http://www.openwall.com).
> 
[snip]
MD5 is a type of checksum, not a method of encryption.


From michele.simionato at gmail.com  Sat Feb 14 09:27:10 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 14 Feb 2009 06:27:10 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com>
Message-ID: <f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>

On Feb 14, 1:30?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> This is what I get:
> """
> (Pdb) func.__name__
> 'greetings'
> (Pdb) func.__dict__
> {}
> (Pdb) func.__module__
> 'pylonsproject.controllers.root'
> """
>
> Which seems correct to me.
>
> By the way, I forgot to mention that what is decorated is an instance
> method. I don't know if that would change something.

This is bad, func should be a function and not an instance
method (see line 49 of decorator.py). If the .signature
attribute of the FunctionMaker is missing, than that's the
reason for the AssertionError you see.
I should probably raise a clearer error message.
I lack the context to see how this could be fixed in your case, but
this a not a show stopper, you can just keep the original decorator
and forget about making it signature preserving.


From barry at python.org  Sat Feb 14 09:32:43 2009
From: barry at python.org (Barry Warsaw)
Date: Sat, 14 Feb 2009 09:32:43 -0500
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <30B69D1B-E36B-4FAA-A584-0B892E50A11C@python.org>

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Hash: SHA1

On Feb 13, 2009, at 11:46 PM, Benjamin Kaplan wrote:

> Any chance of getting a Mac installer for this one?

I believe Ronald is planning to upload it soon.
Barry

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From linuxguy123 at gmail.com  Sat Feb 14 09:45:08 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Sat, 14 Feb 2009 07:45:08 -0700
Subject: Function name limit in Python ?
Message-ID: <1234622708.3786.17.camel@localhost.localdomain>

Excuse my ignorance, but is there a limit to the size of function names
in Python ?

I named a function getSynclientVersion() and I got an error when I
called it.  I renamed the same function to getSCVersion() and it called
fine.

Why ?

Thanks



From sjmachin at lexicon.net  Sat Feb 14 09:51:56 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sat, 14 Feb 2009 06:51:56 -0800 (PST)
Subject: Problem building Python extension
References: <728a0c1c-2808-493c-a2db-c583442d2303@d32g2000yqe.googlegroups.com>
	<mailman.9478.1234518816.3487.python-list@python.org>
	<fd4f948b-9fd6-467e-9558-59893d0b1c4c@l39g2000yqn.googlegroups.com>
	<mailman.9487.1234525550.3487.python-list@python.org>
	<c27ab012-5f35-4405-aaad-6e6859de38e2@o36g2000yqh.googlegroups.com>
Message-ID: <8c2d80db-f948-4221-97a1-9eb0650a8403@r15g2000prh.googlegroups.com>

On Feb 14, 7:04?pm, martijnsteenw... at gmail.com wrote:
> On 13 feb, 12:45, Christian Heimes <li... at cheimes.de> wrote:
>
> > martijnsteenw... at gmail.com wrote:
> > > Thanks a lot for your reply. I downloaded & installed Visual C# 2008
> > > express, but unfortunately this doesn't change anything in running the
> > > setup file. Unfortunately, still no pyd file is produced...
>
> > > Did I something wrong?
>
> > Yeah, you installed the C# environment. Python is written in C, so you
> > have to get Visual Studio C++ 2008. However a recent version of MinGW32
> > is sufficient to build most extensions.
>
> > Christian
>
> Hi Christian,
>
> Thanks for your reply. In mean time, I discovered the C++ thing
> already ;-).
> Now I installed MinGW, but still the same happens. If I run the setup
> file, the same output comes on the command line and no pyd file is
> created... GRRR
>
> Any suggestions?

AFAIK it will attempt to use a compiler other than the one that Python
was compiled with only if specifically directed to e.g. with --
compiler=mingw32 in the command line when running setup.py.



From dear.jay.logan at gmail.com  Sat Feb 14 10:03:54 2009
From: dear.jay.logan at gmail.com (josh logan)
Date: Sat, 14 Feb 2009 07:03:54 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<mailman.9373.1234402741.3487.python-list@python.org>
	<cef02d99-6e77-4c04-ae69-feb7c72b0e67@j38g2000yqa.googlegroups.com>
	<pan.2009.02.12.06.15.20@REMOVE.THIS.cybersource.com.au>
	<48b49eef-b3c1-4a9d-bf38-ad24c2b89622@t11g2000yqg.googlegroups.com>
Message-ID: <f0a23305-c55c-4713-8937-3c8c5816ef52@s1g2000prg.googlegroups.com>

On Feb 13, 7:44?pm, Basilisk96 <basilis... at gmail.com> wrote:
> On Feb 12, 1:15?am, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > > I usually strive
> > > for comprehensions if a for loop can be reduced to such.
>
> > Any particular reason?
>
> Only two.
> 1.) I was impressed by their clarity and conciseness when I first
> discovered them.
> 2.) I also read now and then that simple list comprehensions are
> faster when compared with their for-loop equivalents because of the
> way comprehensions are implemented under the hood. My example is a far
> cry from a "simple" comprehension, however. :)
>
> > If there's only one call to func(), and you ignore the (probably) fixed
> > cost of jumping into a generator each time, then it shouldn't make any
> > difference.
>
> > If you are comparing one call to func() in a for loop versus three calls
> > to func() in a list comp or generator expression, then of course the for
> > loop will be more efficient.
>
> I agree. I would rather call func() only once per iteration in any
> case. I will revise it to a plain for loop with a single call.
>
> Thanks,
> -Basilisk96

Just as long as you do realize that it is possible to do what you were
looking with one call to func() using chained generators, as
demonstrated in my post above. Whichever way is clearest for you would
be the way I'd go.


From google at mrabarnett.plus.com  Sat Feb 14 10:08:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 15:08:00 +0000
Subject: Function name limit in Python ?
In-Reply-To: <1234622708.3786.17.camel@localhost.localdomain>
References: <1234622708.3786.17.camel@localhost.localdomain>
Message-ID: <4996DE50.807@mrabarnett.plus.com>

Linuxguy123 wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  I renamed the same function to getSCVersion() and it called
> fine.
> 
> Why ?
> 
Probably a just spelling mistake. Double-check that the two names are 
identical.


From ptmcg at austin.rr.com  Sat Feb 14 10:13:42 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sat, 14 Feb 2009 07:13:42 -0800 (PST)
Subject: Function name limit in Python ?
References: <mailman.9531.1234622714.3487.python-list@python.org>
Message-ID: <e3d9f52b-fbe6-41d4-8da9-060a0b6a4b70@x6g2000pre.googlegroups.com>

On Feb 14, 8:45?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
>
> I named a function getSynclientVersion() and I got an error when I
> called it. ?I renamed the same function to getSCVersion() and it called
> fine.
>
> Why ?
>

Hello again, Linuxguy123!  I see you are forging ahead in your quest
for Python knowledge.

Here is a small snippet that refutes your assertion that function name
length is a problem (but surely, you could have written this small a
test and answered your own question...):

def getSynclientVersion():
    return "1.2.3.4"

print getSynclientVersion()

prints:
1.2.3.4

Let's try something a bit longer:
def
abcdefghijklmnopqrstuvwxyz_1234567890_abcdefghijklmnopqrstuvwxyz_1234567890
():
    return "Howdy!"

print
abcdefghijklmnopqrstuvwxyz_1234567890_abcdefghijklmnopqrstuvwxyz_1234567890
()

prints:
Howdy!

So I don't think the problem you are having is the length of your
method name.

Your quest will be much more productive if, in the future, you post a
little more information with these questions:

- Post the code that you wrote - this is trickier than it sounds.  The
best post is the smallest possible extract of your code that
reproduces the error in question.

But please, DONT try to send in fresh code that you feel represents
your problem without first verifying that it does.  Many people post a
summary of their code because they don't want to post their secret
source code, or their 3000 lines of code - and then in their summary,
they fix the problem they were having.  Then c.l.py readers spend a
lot of time going "wha...?" because the posted code has no error.

- Post the exception that was returned

Probably even more helpful than posting code.  What exactly was the
problem?  Python is not really that bad at giving some informative
messages.  Perhaps you misspelled your method name:

print getSynClientVersion()

gives this error:
NameError: name 'getSynClientVersion' is not defined

It's not defined because I named it "getSynclientVersion" - with a
little 'c', not a big 'C'.

Or maybe you misused the value returned from the method:

print getSynclientVersion().length

gives:

AttributeError: 'str' object has no attribute 'length'

An error, surely, but it has nothing to do with the length of the
method name I called.


Help us help you, Linuxguy123!
-- Paul


From ptmcg at austin.rr.com  Sat Feb 14 10:19:45 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sat, 14 Feb 2009 07:19:45 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
Message-ID: <2b4e62a9-efa8-4656-98e4-4755a10e7cac@v5g2000pre.googlegroups.com>

On Feb 11, 7:22?pm, Basilisk96 <basilis... at gmail.com> wrote:
>...
> where "func" is a single-argument function that returns either a
> string or None, but is an expensive call.
> I am pretty sure that the sorted() construct cannot be improved much
> further, but...
> ...does anyone have ideas on improving the "rawPairs" iterator so that
> it calls "func(s)" only once per iteration? ?Perhaps a lambda
> construct, but I am not sure how to go about it...?
>
> Cheers,
> Basilisk96

If func is expensive, you could try memoizing it.  Then subsequent
"calls" just do arg lookups.  Michele Simianato has posted a good
memoizing decorator on the Python wiki.

-- Paul


From gyromagnetic at gmail.com  Sat Feb 14 10:53:46 2009
From: gyromagnetic at gmail.com (gyro)
Date: Sat, 14 Feb 2009 08:53:46 -0700
Subject: confusion about variable scope in a class
Message-ID: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>

Hi,
I was writing a Python script to perform some data analyses and was
surprised by some behavior I noted. A simple test program illustrating
the behavior is below.
I do not understand why the value of 'data' is being modified. I am
obviously missing something obvious, and would certainly appreciate an
explanation of why this is happening.

Thank you.

-gf

----------

#!/bin/env python

class TestPop(object):
    def round1(self,data1):
        t = data1.pop(-1)
		
    def round2(self,data2):
        t = data2.pop(-1)
		
    def tester(self):
        data = range(10)
        self.round1(data)
        print data
        self.round2(data)
        print data

if __name__ == '__main__':
    tp = TestPop()
    tp.tester()


From andrew at acooke.org  Sat Feb 14 11:22:19 2009
From: andrew at acooke.org (andrew cooke)
Date: Sat, 14 Feb 2009 13:22:19 -0300 (CLST)
Subject: confusion about variable scope in a class
In-Reply-To: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>
References: <ace26be40902140753q225edfe2p8ee2d58a7968fe07@mail.gmail.com>
Message-ID: <524bdbf505d1e37ad0807c8e97087edb.squirrel@acooke.dyndns.org>


it's not a scope issue.  you are confusing variables and objects.

a variable is a box that can hold an object

so x = 2 puts the object '2' in the box 'x'.

following that with x = '3' changes the box 'x' to hold the object '3'.

but lists are also boxes, different from variables.

so x = [1,2,3]

puts the a list object, that is a box that contains 1, 2 and 3, in 'x'

then y = x

puts THE SAME list object in box 'y'.

then y[1] = 4 changes the second item in the list's box to 4

the print x gives "[1,4,3]" because you have changed contents of the list.

in contrast x = 3 then y = x then y = 4 does not change x because you care
changing variables, not list contents.

to fix your code, you need to copy the list

x = [1,2,3]
y = list(x) # copy
y[1] = 4
print x
[1,2,3]

surely this is ina faq?  it comes up once a day...

andrew



gyro wrote:
> Hi,
> I was writing a Python script to perform some data analyses and was
> surprised by some behavior I noted. A simple test program illustrating
> the behavior is below.
> I do not understand why the value of 'data' is being modified. I am
> obviously missing something obvious, and would certainly appreciate an
> explanation of why this is happening.
>
> Thank you.
>
> -gf
>
> ----------
>
> #!/bin/env python
>
> class TestPop(object):
>     def round1(self,data1):
>         t = data1.pop(-1)
>
>     def round2(self,data2):
>         t = data2.pop(-1)
>
>     def tester(self):
>         data = range(10)
>         self.round1(data)
>         print data
>         self.round2(data)
>         print data
>
> if __name__ == '__main__':
>     tp = TestPop()
>     tp.tester()
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From nagle at animats.com  Sat Feb 14 11:27:29 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 08:27:29 -0800
Subject: Can Python serial support run at 45.45 baud?
Message-ID: <4996e984$0$1657$742ec2ed@news.sonic.net>

    Can Python's serial port support be made to run at 45.45 baud, the old
"60 speed" Teletype machine speed?  I've restored a Model 15 teletype from
WWII.  Works great after cleaning, oiling, and adjustment.  There's
Perl support for this, and a Perl program ("http://www.buzbee.net/heavymetal")
that runs the things.  I'd like to do something similar in Python, both
on Windows and Linux.

    I'm proposing to use Python 2.6, PyWin32-212, and PySerial 2.4.
The PySerial interface allows requesting a specific baud rate, but does that
propagate properly all the way down into Windows?   And what about
Linux, where the "stty" interface is quite different?

					John Nagle


From nick at craig-wood.com  Sat Feb 14 11:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 14 Feb 2009 10:32:00 -0600
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
Message-ID: <slrngpdpt1.m13.nick@irishsea.home.craig-wood.com>

Sammo <sammo2828 at gmail.com> wrote:
>  String concatenation has been optimized since 2.3, so using += should
>  be fairly fast.
> 
>  In my first test, I tried concatentating a 4096 byte string 1000 times
>  in the following code, and the result was indeed very fast (12.352 ms
>  on my machine).
> 
>  import time
>  t = time.time()
>  mydata = ""
>  moredata = "A"*4096
>  for i in range(1000):
>      mydata += moredata # 12.352 ms
>  print "%0.3f ms"%(1000*(time.time() - t))
> 
>  However, I got a different result in my second test, which is
>  implemented in a class with a feed() method. This test took 4653.522
>  ms on my machine, which is 350x slower than the previous test!
> 
>  class StringConcatTest:
>      def __init__(self):
>          self.mydata = ""
> 
>      def feed(self, moredata):
>          self.mydata += moredata # 4653.522 ms
> 
>  test = StringConcatTest()
>  t = time.time()
>  for i in range(1000):
>      test.feed(moredata)
>  print "%0.3f ms"%(1000*(time.time() - t))
> 
>  Note that I need to do something to mydata INSIDE the loop, so please
>  don't tell me to append moredata to a list and then use "".join after
>  the loop.
> 
>  Why is the second test so much slower?

The optimized += depends on their being no other references to the
string.  Strings are immutable in python.  So append must return a new
string.  However the += operation was optimised to do an in-place
append if and only if there are no other references to the string.

You can see this demonstrated here

$ python -m timeit -s 'a="x"' 'a+="x"'
1000000 loops, best of 3: 0.231 usec per loop

$ python -m timeit -s 'a="x"; b=a' 's = a; a+="x"'
100000 loops, best of 3: 30.1 usec per loop

You are keeping the extra reference in a class instance like this

$ python -m timeit -s 'class A(object): pass' -s 'a=A(); a.a="x"' 'a.a+="x"'
100000 loops, best of 3: 30.7 usec per loop

Knowing that, this optimization suggests itself

$ python -m timeit -s 'class A(object): pass' -s 'a=A(); a.a="x"' 's = a.a; a.a = None; s += "x"; a.a = s'
1000000 loops, best of 3: 0.954 usec per loop

Or in your example

class StringConcatTest:
    def __init__(self):
        self.mydata = ""
    def feed(self, moredata):
        #self.mydata += moredata
        s = self.mydata
        del self.mydata
        s += moredata
        self.mydata = s

moredata = "A"*4096
test = StringConcatTest()
t = time.time()
for i in range(1000):
    test.feed(moredata)

print "%0.3f ms"%(1000*(time.time() - t))

Before it was 3748.012 ms on my PC, afterwards it was 52.737 ms

However that isn't a perfect solution - what if something had another
reference on self.mydata?

You really want a non-immutable string for this use.  array.array
is a possibility

$ python -m timeit -s 'import array' -s 'a = array.array("c")' 'a.extend("x")'
100000 loops, best of 3: 2.01 usec per loop

There are many other possibilities though like the mmap module.
-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Sat Feb 14 11:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 14 Feb 2009 10:32:00 -0600
Subject: encrypting lines from file with md5 module doesn't work?
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
Message-ID: <slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>

Canned <user at domain.invalid> wrote:
>  I write a small script that read lines from plain text file and encrypt
>  each lines using md5 module. I have a small word list that contain 2000+
>  words, 1 word/line. Using the code below, I can save the output to
>  another file to use it with john the ripper (http://www.openwall.com).
> 
>  Here is the part that annoys me, john recognize the output as des and
>  not as md5. Using the original wordlist, I tried to crack the list but
>  nothing has come up after waiting for almost 9 hours. Can someone please
>  tell me what did I wrong? Why john don't recognize the output as md5?
>  I'm using python 2.5.1 and I'm python noob and also don't have any
>  knowledge about encryption.
> 
>  import sys, md5
> 
>  f = open(sys.argv[1])
>  obj = md5.new()
> 
>  for line in f:
>          if line[-1:] == '\n':
>                  text = line[:-1]
>          obj.update(text),
>          print text + ':' + obj.hexdigest()
> 
>  f.close()
> 
> 
>  000000:670b14728ad9902aecba32e22fa4f6bd
>  00000000:c47532bbb1e2883c902071591ae1ec9b
>  111111:bf874003f752e86e6d6ba6d6df1f24a2
>  11111111:65a89de3000110bf37bcafdbd33df55a
>  121212:38a8eeb4dfb0f86aefea908365817c15
>  123123:f226a65a908909b83aed92661897d0c9

john cracks password files if I remember rightly.

md5 encoded password files don't look like that, they look like this

guest:$1$3nvOlOaw$vRWaitT8Ne4sMjf9NOrVZ.:13071:0:99999:7:::

(not a real password line!)

You need to work out how to write that format.

>From memory: the "$1" bit means it is an md5 hash, the next
"$3nvOlOaw$" is the salt and the final "$vRWaitT8Ne4sMjf9NOrVZ." is
the md5 hash in some encoded format or other!  Some googling should
reveal the correct algorithm!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From user at domain.invalid  Sat Feb 14 11:32:03 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 17:32:03 +0100
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <mailman.9529.1234620902.3487.python-list@python.org>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
	<mailman.9529.1234620902.3487.python-list@python.org>
Message-ID: <4996f1ff$0$7833$9a622dc7@news.kpnplanet.nl>

MRAB schreef:
> Canned wrote:
>> Hi,
>> I need some help with my script. I hope someone can show me the right
>> direction or at least explain to me what did I wrong?
>>
>> I write a small script that read lines from plain text file and encrypt
>> each lines using md5 module. I have a small word list that contain 2000+
>> words, 1 word/line. Using the code below, I can save the output to
>> another file to use it with john the ripper (http://www.openwall.com).
>>
> [snip]
> MD5 is a type of checksum, not a method of encryption.

I found this from google: http://tinyurl.com/4ow2q4
Using that, I changed my script and it seems that it works well. John
recognize it as md5.

It also raise another question. John can crack my password from
/etc/shadow in less than a second, but if I write it down in a file and
using the code below to encrypt the password, john would took really
long time to crack the password.

I've tried several different password using passwd command and my code
to generate md5 hash, but it seems that john really having trouble with
hashes generated with my code as the hashes generated with passwd being
cracked in a matter of second.
Is there something wrong with the code? Am I missing something?

-----------------code-------------------------
#!/usr/bin/env python

import sys
import md5encrypt  # from http://tinyurl.com/4ow2q4

f = open(sys.argv[1])

for line in f:
        if line[-1:] == '\n':
                text = line[:-1]
        print text + ':' + md5encrypt.md5crypt(text,
md5encrypt.generate_salt(5))

f.close()

---------------password.txt--------------------
000000
00000000
111111
11111111
121212
123123


-------------result.txt-----------------
000000:$1$<rVpM$5cYcnJv6qY3AXKiJXKwh4/
00000000:$1$vg^@W$EqAu1mLK6UXogFgkMuf3i1
111111:$1$TVq;y$87mqQPcKXlnj6Ap.1rFgH0
11111111:$1$.iPHo$dLNmzzv5BXBFTn8FqCmog.
121212:$1$`]iS!$L3uSDmn17PGhZ.k275WZj0
123123:$1$}g5"m$OwzfVzg0CMEhNX271K.yp0


From grante at visi.com  Sat Feb 14 11:33:58 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 10:33:58 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
Message-ID: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:

> Can Python's serial port support be made to run at 45.45 baud,
> the old "60 speed" Teletype machine speed? 

If your hardware and OS supports it, Python can be made to
support it.

> I've restored a Model 15 teletype from WWII.

Fun.  I worked with one of those in school back in the day.

> Works great after cleaning, oiling, and adjustment.  There's
> Perl support for this, and a Perl program
> ("http://www.buzbee.net/heavymetal") that runs the things. I'd
> like to do something similar in Python, both on Windows and
> Linux.

OK, go ahead.

> I'm proposing to use Python 2.6, PyWin32-212, and PySerial
> 2.4. The PySerial interface allows requesting a specific baud
> rate, but does that propagate properly all the way down into
> Windows?

Good question.  Since you're the one with the hardware, you'll
have to tell us.  If it doesn't work, it should be trivial to
fix.  Just tell us what mechanism is used by Perl, and we'll
either fix pyserial or tell you how to do so.

> And what about Linux, where the "stty" interface is quite
> different?

Same answer.

-- 
Grant



From deets at nospam.web.de  Sat Feb 14 11:37:07 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 14 Feb 2009 17:37:07 +0100
Subject: confusion about variable scope in a class
In-Reply-To: <mailman.9533.1234626830.3487.python-list@python.org>
References: <mailman.9533.1234626830.3487.python-list@python.org>
Message-ID: <6voa9mFku543U1@mid.uni-berlin.de>

gyro schrieb:
> Hi,
> I was writing a Python script to perform some data analyses and was
> surprised by some behavior I noted. A simple test program illustrating
> the behavior is below.
> I do not understand why the value of 'data' is being modified. I am
> obviously missing something obvious, and would certainly appreciate an
> explanation of why this is happening.


Lists are mutables, and python passes around references to objects, not 
copies.

So if you want a copy, you need to create one explicit, either by using e.g.


new_list = list(old_list)

which will create a shollow copy of the list, or by using the 
library-module "copy" that also offers a "deepcopy" function.


Diez


From google at mrabarnett.plus.com  Sat Feb 14 11:56:00 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 16:56:00 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
Message-ID: <4996F7A0.4060008@mrabarnett.plus.com>

Grant Edwards wrote:
> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> 
>> Can Python's serial port support be made to run at 45.45 baud,
>> the old "60 speed" Teletype machine speed? 
> 
> If your hardware and OS supports it, Python can be made to
> support it.
> 
[snip]
I had a quick look at the Windows API. The struct member for the baud
rate is of type DWORD, ie an integer.



From marduk at letterboxes.org  Sat Feb 14 11:57:17 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sat, 14 Feb 2009 11:57:17 -0500
Subject: Function name limit in Python ?
In-Reply-To: <1234622708.3786.17.camel@localhost.localdomain>
References: <1234622708.3786.17.camel@localhost.localdomain>
Message-ID: <1234630637.7402.0.camel@centar.nbk>

On Sat, 2009-02-14 at 07:45 -0700, Linuxguy123 wrote:
> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  

You forgot to paste the error.



From user at domain.invalid  Sat Feb 14 11:57:30 2009
From: user at domain.invalid (Canned)
Date: Sat, 14 Feb 2009 17:57:30 +0100
Subject: encrypting lines from file with md5 module doesn't work?
In-Reply-To: <slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>
References: <4996ba26$0$7834$9a622dc7@news.kpnplanet.nl>
	<slrngpdqf2.m13.nick@irishsea.home.craig-wood.com>
Message-ID: <4996f7f6$0$7827$9a622dc7@news.kpnplanet.nl>

Nick Craig-Wood schreef:
> Canned <user at domain.invalid> wrote:
>>  I write a small script that read lines from plain text file and encrypt
>>  each lines using md5 module. I have a small word list that contain 2000+
>>  words, 1 word/line. Using the code below, I can save the output to
>>  another file to use it with john the ripper (http://www.openwall.com).
>>
>>  Here is the part that annoys me, john recognize the output as des and
>>  not as md5. Using the original wordlist, I tried to crack the list but
>>  nothing has come up after waiting for almost 9 hours. Can someone please
>>  tell me what did I wrong? Why john don't recognize the output as md5?
>>  I'm using python 2.5.1 and I'm python noob and also don't have any
>>  knowledge about encryption.
>>
>>  import sys, md5
>>
>>  f = open(sys.argv[1])
>>  obj = md5.new()
>>
>>  for line in f:
>>          if line[-1:] == '\n':
>>                  text = line[:-1]
>>          obj.update(text),
>>          print text + ':' + obj.hexdigest()
>>
>>  f.close()
>>
>>
>>  000000:670b14728ad9902aecba32e22fa4f6bd
>>  00000000:c47532bbb1e2883c902071591ae1ec9b
>>  111111:bf874003f752e86e6d6ba6d6df1f24a2
>>  11111111:65a89de3000110bf37bcafdbd33df55a
>>  121212:38a8eeb4dfb0f86aefea908365817c15
>>  123123:f226a65a908909b83aed92661897d0c9
> 
> john cracks password files if I remember rightly.
> 
> md5 encoded password files don't look like that, they look like this
> 
> guest:$1$3nvOlOaw$vRWaitT8Ne4sMjf9NOrVZ.:13071:0:99999:7:::
> 
> (not a real password line!)
> 
> You need to work out how to write that format.
> 
Yes, I'm aware of that format and john only need the first 2 fields to
work with, and the rest, AFAIK is ignored.

So the format from my example should be:
000000:$1$670b14728ad9902aecba32e22fa4f6bd

> From memory: the "$1" bit means it is an md5 hash, the next
> "$3nvOlOaw$" is the salt and the final "$vRWaitT8Ne4sMjf9NOrVZ." is
> the md5 hash in some encoded format or other!  Some googling should
> reveal the correct algorithm!
> 

Googling around, I found a piece of code that could do that.
http://tinyurl.com/4ow2q4. Please read my another post about that. I'm
not python expert and I have a little knowledge about encryption.


From Bryan.Fodness at gmail.com  Sat Feb 14 11:57:46 2009
From: Bryan.Fodness at gmail.com (Bryan.Fodness at gmail.com)
Date: Sat, 14 Feb 2009 08:57:46 -0800 (PST)
Subject: Extract an image from a RTF file
Message-ID: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>

I have a large amount of RTF files where the only thing in them is an
image.  I would like to extract them an save them as a png.
Eventually, I would like to also grab some text that is on the image.
I think PIL has something for this.

Does anyone have any suggestion on how to start this?


From deets at nospam.web.de  Sat Feb 14 12:14:11 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sat, 14 Feb 2009 18:14:11 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
Message-ID: <6vocf5Fkv5a9U1@mid.uni-berlin.de>

argo785 at gmail.com schrieb:
> When creating a Python binding to a C or C++ library, which is easier
> to wrap, the C lib or the C++ one? Given a choice, if you had to
> choose between using one of two libs, one written in C, the other in C+
> + -- both having approximately the same functionality -- which would
> you rather deal with from your Python code?
> 
> It would seem to me that there's fewer design considerations when
> wrapping a library written in C; you just wrap the functions. However,
> since Python supports OOP nicely, it might also be that wrapping C++
> code *could* also be staightforward... Are there many pitfalls when
> having to map C++'s notion of OO to Python?

The answer is easy: if you use C, you can use ctypes to create a wrapper 
- with pure python, no compilation, no platform issues.

Which IMHO makes a strong point for C - if you need OO, it's bolted on 
easily using Python itself, by creating some nice wrapper classes.

Diez


From ronaldoussoren at mac.com  Sat Feb 14 12:16:58 2009
From: ronaldoussoren at mac.com (Ronald Oussoren)
Date: Sat, 14 Feb 2009 18:16:58 +0100
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <49968713.4080705@v.loewis.de>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
	<49968713.4080705@v.loewis.de>
Message-ID: <7B96CE20-80E9-47DF-9C14-A542E47F0017@mac.com>


On 14 Feb, 2009, at 9:55, Martin v. L?wis wrote:

>> Any chance of getting a Mac installer for this one?
>
> Chances are non-zero, yes.


I had hoped to build one last night, but got home way later than I had  
planned. The installer is building as I type this.

Ronald

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From orpap at nus.edu.sg  Sat Feb 14 12:31:10 2009
From: orpap at nus.edu.sg (Ajith Prasad)
Date: Sat, 14 Feb 2009 09:31:10 -0800 (PST)
Subject: Financial Modeling in Python
Message-ID: <a533215d-ab74-4739-b242-a111163b6e5c@x6g2000pre.googlegroups.com>

http://as.wiley.com/WileyCDA/WileyTitle/productCd-0470987847.html now
lists the contents of a new book:

Financial Modeling in Python
Shayne Fletcher, Christopher Gardner
ISBN: 978-0-470-98784-1
Hardcover
280 pages
August 2009
Wiley List Price:  US $130.00



From tjreedy at udel.edu  Sat Feb 14 12:33:53 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 12:33:53 -0500
Subject: Thank you, Tkinter. (easy to use)
In-Reply-To: <c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>
References: <d605abb9-437c-4516-a9ba-7de7dd4ff518@f3g2000yqf.googlegroups.com>	<766ffd59-b531-4268-88ae-357dc726c67f@33g2000yqm.googlegroups.com>
	<c8bf8af7-2280-4209-918b-f40e726b147b@z1g2000yqn.googlegroups.com>
Message-ID: <gn6va0$54r$1@ger.gmane.org>

DLitgo wrote:

> Does anyone know of a quick and easy install for
 > PIL + JPEG for Mac OS X (10.5)?

If you don't get an answer, try a thread with the above as the title.
There may be a python-mac list somewhere too.



From tjreedy at udel.edu  Sat Feb 14 12:45:44 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 12:45:44 -0500
Subject: Reading a file
In-Reply-To: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
Message-ID: <gn7007$8c5$1@ger.gmane.org>

zaheer.agadi at gmail.com wrote:
> Hi
> 
> How do i read  a file in Python and search a particular pattern
> like I have a file char.txt  which has
> 
> Mango=sweet
> Sky=blue
> 
> I want to get the strings sweet and blue,How to do this..?

for line in open('char.txt'):
   if line.find('sweet') != -1 or line.find('blue') != -1:
     print(line)

Read the section of the Lib Manual on string methods.



From tjreedy at udel.edu  Sat Feb 14 13:01:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 14 Feb 2009 13:01:57 -0500
Subject: Extract an image from a RTF file
In-Reply-To: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
References: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
Message-ID: <gn70ul$bj2$1@ger.gmane.org>

Bryan.Fodness at gmail.com wrote:
> I have a large amount of RTF files where the only thing in them is an
> image.  I would like to extract them an save them as a png.
> Eventually, I would like to also grab some text that is on the image.
> I think PIL has something for this.
> 
> Does anyone have any suggestion on how to start this?

Wikepedia Rich Text Format has several links, which lead to
http://pyrtf.sourceforge.net/
http://code.google.com/p/pyrtf-ng/
The former says rtf generation, including images.
The latter says rtf generation and parsing, but only claims to be a 
rewrite of the former.



From aahz at pythoncraft.com  Sat Feb 14 13:05:01 2009
From: aahz at pythoncraft.com (Aahz)
Date: 14 Feb 2009 10:05:01 -0800
Subject: How to debug deadlock?
References: <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30@r10g2000prf.googlegroups.com>
Message-ID: <gn714d$9aq$1@panix3.panix.com>

In article <bf6fbab3-7ec7-4210-bc15-ad4e2f6a2f30 at r10g2000prf.googlegroups.com>,
Victor Lin  <Bornstub at gmail.com> wrote:
>
>I am developing a multi-threading application, I encounter a deadlock.
>I use Visual C++ Express 2008 to trace the program. Once the deadlock
>occurs, I just pause the program and trace. I found that when deadlock
>occurs, there will be two threads called python from my C++ extension.
>All of them use Queue in python code, so I guess the deadlock might
>caused by Queue. But however, once the extension goes into python
>code, I can't see nothing but asm code and binary from the VC++
>debugger. I would like to know are there any way to dump the call
>stack of python code after I paused the program? And how can I know
>what lock are there in threads caused the deadlock?

You are already hosed if you have two threads calling into Python,
because you didn't properly acquire the GIL.  I can't help beyond that;
try using the mailing list
http://mail.python.org/mailman/listinfo/capi-sig
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From google at mrabarnett.plus.com  Sat Feb 14 13:07:20 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:07:20 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970561$0$1642$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
Message-ID: <49970858.3070005@mrabarnett.plus.com>

John Nagle wrote:
> Grant Edwards wrote:
>> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
>>
>>> Can Python's serial port support be made to run at 45.45 baud,
>>> the old "60 speed" Teletype machine speed? 
>>
>> If your hardware and OS supports it, Python can be made to
>> support it.
> 
>    OK, tried to open the port, using Python 2.6, latest PySerial
> and PyWin32:
> 
>     ser = serial.Serial(port, baudrate=baud,
>             bytesize=serial.FIVEBITS,
>             parity=serial.PARITY_NONE,
>             stopbits=serial.STOPBITS_TWO)
> 
> Traceback (most recent call last):
>   File "serialtest.py", line 27, in <module>
>     main()
>   File "serialtest.py", line 24, in main
>     ser = openportbaudot(0,45.45)
>   File "serialtest.py", line 17, in openportbaudot
>     stopbits=serial.STOPBITS_TWO)
>   File "D:\python26\lib\site-packages\serial\serialutil.py", line 171, 
> in __init__
>     self.open()
>   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 63, 
> in open
>     self._reconfigurePort()
>   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 171, 
> in _reconfigurePort
>     raise ValueError("Cannot configure port, some setting was wrong. 
> Original message: %s" % e)
> ValueError: Cannot configure port, some setting was wrong. Original 
> message: (87, 'SetCommState', 'The parameter is incorrect.')
> 
>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
> according
> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
> thing.   That looks like a bug.
> 
>    I tried various values for "baud".  PySerial will accept "45", and 
> even "45.45", although I doubt that it's really calculating the serial 
> port divisor
> values from a floating point value.   (Standard serial port hardware can do
> 45.45 baud, and most PCs with non-USB serial ports will do it quite well.)
> For my application, 45 baud should work, with two stop bits; the
> tolerances aren't that tight.
> 
I don't think it's a Python bug. The MSDN website says this:

(http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx.)

When a DCB structure is used to configure the 8250, the following 
restrictions apply to the values specified for the ByteSize and StopBits 
members:

     * The number of data bits must be 5 to 8 bits.
     * The use of 5 data bits with 2 stop bits is an invalid 
combination, as is 6, 7, or 8 data bits with 1.5 stop bits.



From nagle at animats.com  Sat Feb 14 13:26:22 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 10:26:22 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
Message-ID: <49970561$0$1642$742ec2ed@news.sonic.net>

Grant Edwards wrote:
> On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> 
>> Can Python's serial port support be made to run at 45.45 baud,
>> the old "60 speed" Teletype machine speed? 
> 
> If your hardware and OS supports it, Python can be made to
> support it.

    OK, tried to open the port, using Python 2.6, latest PySerial
and PyWin32:

	ser = serial.Serial(port, baudrate=baud,
			bytesize=serial.FIVEBITS,
			parity=serial.PARITY_NONE,
			stopbits=serial.STOPBITS_TWO)

Traceback (most recent call last):
   File "serialtest.py", line 27, in <module>
     main()
   File "serialtest.py", line 24, in main
     ser = openportbaudot(0,45.45)
   File "serialtest.py", line 17, in openportbaudot
     stopbits=serial.STOPBITS_TWO)
   File "D:\python26\lib\site-packages\serial\serialutil.py", line 171, in __init__
     self.open()
   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 63, in open
     self._reconfigurePort()
   File "D:\python26\lib\site-packages\serial\serialwin32.py", line 171, in 
_reconfigurePort
     raise ValueError("Cannot configure port, some setting was wrong. Original 
message: %s" % e)
ValueError: Cannot configure port, some setting was wrong. Original message: 
(87, 'SetCommState', 'The parameter is incorrect.')

    Something doesn't like "serial.FIVEBITS".  That's a valid value, according
to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
"serial.EIGHTBITS",  the code will execute, but of course does the wrong
thing.   That looks like a bug.

    I tried various values for "baud".  PySerial will accept "45", and even 
"45.45", although I doubt that it's really calculating the serial port divisor
values from a floating point value.   (Standard serial port hardware can do
45.45 baud, and most PCs with non-USB serial ports will do it quite well.)
For my application, 45 baud should work, with two stop bits; the
tolerances aren't that tight.

					John Nagle


From google at mrabarnett.plus.com  Sat Feb 14 13:48:56 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:48:56 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970ce7$0$1665$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <49971218.2000403@mrabarnett.plus.com>

John Nagle wrote:
> John Nagle wrote:
> 
>>    OK, tried to open the port, using Python 2.6, latest PySerial
>> and PyWin32:
>>
>>     ser = serial.Serial(port, baudrate=baud,
>>             bytesize=serial.FIVEBITS,
>>             parity=serial.PARITY_NONE,
>>             stopbits=serial.STOPBITS_TWO)
>>
>> ValueError: Cannot configure port, some setting was wrong. Original 
>> message: (87, 'SetCommState', 'The parameter is incorrect.')
>>
>>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
>> according
>> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
>> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
>> thing.   That looks like a bug.
> 
>    OK, here's what's wrong.  The allowed numbers for stop bits in 
> Windows are
> 
>     ONESTOPBIT    0    1 stop bit.
>     ONE5STOPBITS    1    1.5 stop bits.
>     TWOSTOPBITS    2    2 stop bits.
> 
> The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
> See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.
> 
> Microsoft documentation 
> ("http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx") says:
> 
>     * The use of 5 data bits with 2 stop bits is an invalid combination,
>     as is 6, 7, or 8 data bits with 1.5 stop bits.
> 
> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)
> 
> Linux has a different set of restrictions; Linux offers only 1 or 2 stop
> bits, and won't do arbitrary baud rates via the "termios" data structure,
> although there are other ways to request that.  At the hardware level,
> there's a clock rate, a counter, and a divisor, so arbitrary baud
> rates can be set.
> 
If 5+2 is invalid, could you work around it with 6+1 instead (one of the
data bits masquerading as a stop bit)? Presumably the device on the
other end won't care as long as it gets the bits it expects...


From google at mrabarnett.plus.com  Sat Feb 14 13:53:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 18:53:12 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970ce7$0$1665$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <49971318.4090208@mrabarnett.plus.com>

John Nagle wrote:
[snip]
> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)
> 
I forgot to add that what Windows allows depends on what the hardware
(the serial chip) allows: the MSDN webpage mentions that the DCB struct
configures the 8250.


From nagle at animats.com  Sat Feb 14 13:59:28 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 10:59:28 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49970561$0$1642$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
Message-ID: <49970ce7$0$1665$742ec2ed@news.sonic.net>

John Nagle wrote:

>    OK, tried to open the port, using Python 2.6, latest PySerial
> and PyWin32:
> 
>     ser = serial.Serial(port, baudrate=baud,
>             bytesize=serial.FIVEBITS,
>             parity=serial.PARITY_NONE,
>             stopbits=serial.STOPBITS_TWO)
> 
> ValueError: Cannot configure port, some setting was wrong. Original 
> message: (87, 'SetCommState', 'The parameter is incorrect.')
> 
>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
> according
> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
> thing.   That looks like a bug.

    OK, here's what's wrong.  The allowed numbers for stop bits in Windows are

	ONESTOPBIT	0	1 stop bit.
	ONE5STOPBITS	1	1.5 stop bits.
	TWOSTOPBITS	2	2 stop bits.

The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.

Microsoft documentation 
("http://msdn.microsoft.com/en-us/library/aa363214(VS.85).aspx") says:

     * The use of 5 data bits with 2 stop bits is an invalid combination,
	as is 6, 7, or 8 data bits with 1.5 stop bits.

So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
Python.  1 stop bit will not physically work on Baudot teletypes; the
main camshaft doesn't come around fast enough.  (Yes, there's an actual
mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
Python level gets a reject at the Win32 level.  (Not sure why Win32
doesn't allow that; extra stop bits just add delay, but don't hurt
anything.  But it's not supported.)

Linux has a different set of restrictions; Linux offers only 1 or 2 stop
bits, and won't do arbitrary baud rates via the "termios" data structure,
although there are other ways to request that.  At the hardware level,
there's a clock rate, a counter, and a divisor, so arbitrary baud
rates can be set.

					John Nagle







From roy at panix.com  Sat Feb 14 14:10:39 2009
From: roy at panix.com (Roy Smith)
Date: Sat, 14 Feb 2009 14:10:39 -0500
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <roy-0D11C8.14103914022009@news.panix.com>

In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
 John Nagle <nagle at animats.com> wrote:

> At the hardware level, there's a clock rate, a counter, and a divisor, 
> so arbitrary baud rates can be set.

Is that really true of modern hardware?  The last time I looked at serial 
port hardware, UARTs took a base clock rate and divided it sequentially 
with flip-flops to get all the possible rates (they usually had some ugly 
logic to generate 110).  You were limited to the specific rates the 
hardware gave you.  Is that no longer the case?


From curt.hash at gmail.com  Sat Feb 14 14:15:49 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Sat, 14 Feb 2009 12:15:49 -0700
Subject: Extract an image from a RTF file
In-Reply-To: <gn70ul$bj2$1@ger.gmane.org>
References: <c1b00b50-9c5c-411d-aa01-129bfd6ed4e0@i18g2000prf.googlegroups.com>
	<gn70ul$bj2$1@ger.gmane.org>
Message-ID: <736698790902141115i5c109300xc9193ed33e973c8b@mail.gmail.com>

On Sat, Feb 14, 2009 at 11:01 AM, Terry Reedy <tjreedy at udel.edu> wrote:
>
> Bryan.Fodness at gmail.com wrote:
>>
>> I have a large amount of RTF files where the only thing in them is an
>> image.  I would like to extract them an save them as a png.
>> Eventually, I would like to also grab some text that is on the image.
>> I think PIL has something for this.
>>
>> Does anyone have any suggestion on how to start this?
>
> Wikepedia Rich Text Format has several links, which lead to
> http://pyrtf.sourceforge.net/
> http://code.google.com/p/pyrtf-ng/
> The former says rtf generation, including images.
> The latter says rtf generation and parsing, but only claims to be a rewrite of the former.
>
> --
> http://mail.python.org/mailman/listinfo/python-list

I've written an RTF parser in Python before, but for the purpose of
filtering and discarding content rather than extracting it.

Take a look at the specification here:
http://www.microsoft.com/downloads/details.aspx?familyid=dd422b8d-ff06-4207-b476-6b5396a18a2b&displaylang=en

You will find that images are specified by one or more RTF control
words followed by a long string of hex data. For this special purpose,
you will not need to write a parser for the entire specification. Just
search the file for the correct sequence of control words, extract the
hex data that follows, and save it to a file.

It helps if you open the RTF document in a text editor and locate the
specific control group that contains the image, as the format and
order of control words varies depending on the application that
created it. If all of your documents are created with the same
application, it will be much easier.


From argo785 at gmail.com  Sat Feb 14 14:37:01 2009
From: argo785 at gmail.com (argo785 at gmail.com)
Date: Sat, 14 Feb 2009 11:37:01 -0800 (PST)
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
Message-ID: <5079b2c4-2dae-484b-96b3-78dedd9b071d@z6g2000pre.googlegroups.com>

On Feb 14, 12:14?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> The answer is easy: if you use C, you can use ctypes to create a wrapper
> - with pure python, no compilation, no platform issues.
>
> Which IMHO makes a strong point for C - if you need OO, it's bolted on
> easily using Python itself, by creating some nice wrapper classes.
>

Thanks for the replies, everyone.

After posting I went back and reviewed some of my old C books as well
as the C++ ones. It's interesting and instructive to look back at C++
after you've used languages like Python for a while. I'd forgotten how
complicated C++ code can get.


From hniksic at xemacs.org  Sat Feb 14 14:49:45 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sat, 14 Feb 2009 20:49:45 +0100
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
Message-ID: <87vdrciysm.fsf@mulj.homelinux.net>

"Diez B. Roggisch" <deets at nospam.web.de> writes:

> The answer is easy: if you use C, you can use ctypes to create a
> wrapper - with pure python, no compilation, no platform issues.

The last part is not true.  ctypes doesn't work on 64-bit
architectures, nor does it work when Python is built with non-gcc Unix
compilers.


From tripplowe at gmail.com  Sat Feb 14 15:06:14 2009
From: tripplowe at gmail.com (tripp)
Date: Sat, 14 Feb 2009 12:06:14 -0800 (PST)
Subject: Fortran array in python (f2py?)...
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
Message-ID: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>

OK.  It sounds like it would be easiest for me, then, to dump the
arrays to a binary file (much faster than dumping it to a text) from
the fortran program.  Then use f2py to load a fortran module to read
it.?.

How well does python handle binary files?  Maybe I could skit the f2py
all together if I can get python to read the fortran binary file...

-TLowe


From lists at cheimes.de  Sat Feb 14 15:08:45 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 14 Feb 2009 21:08:45 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <87vdrciysm.fsf@mulj.homelinux.net>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
Message-ID: <gn78cd$vko$1@ger.gmane.org>

Hrvoje Niksic schrieb:
> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> The answer is easy: if you use C, you can use ctypes to create a
>> wrapper - with pure python, no compilation, no platform issues.
> 
> The last part is not true.  ctypes doesn't work on 64-bit
> architectures, nor does it work when Python is built with non-gcc Unix
> compilers

ctypes works on 64bit systems, too. However it's a pain in the ... back
to write code with ctypes that works across all platforms. I used to use
ctypes for wrapper but eventually I switched to Cython.

Christian



From kwmsmith at gmail.com  Sat Feb 14 15:34:18 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Sat, 14 Feb 2009 14:34:18 -0600
Subject: Fortran array in python (f2py?)...
In-Reply-To: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
	<d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
Message-ID: <c266a7930902141234wa2090dew63e90cdba333d345@mail.gmail.com>

On Sat, Feb 14, 2009 at 2:06 PM, tripp <tripplowe at gmail.com> wrote:

> OK.  It sounds like it would be easiest for me, then, to dump the
> arrays to a binary file (much faster than dumping it to a text) from
> the fortran program.  Then use f2py to load a fortran module to read
> it.?.


I've done something similar and have written some wrapper functions (in pure
python) that read in fortran binary arrays and puts them into a numpy
array.  You have to deal with fortran records, which (for the fortran
compiler I'm using) puts a 4-byte record length indicator at the beginning
and end of each record, with the raw binary data between.  The issue is
mildly complicated if you have to deal with endianness incompatibilites
between computers.  IIRC, the format of the records is compiler dependent,
although I've found that gfortran, g77 and xlfortran are consistent with
each other.

If you like I'd be happy to send you the code.

Kurt
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From Scott.Daniels at Acm.Org  Sat Feb 14 15:39:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 14 Feb 2009 12:39:33 -0800
Subject: Fortran array in python (f2py?)...
In-Reply-To: <d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
References: <42cda6f6-eaa2-44d9-be39-443fcc460806@o36g2000yqh.googlegroups.com>
	<mailman.9513.1234561282.3487.python-list@python.org>
	<d84bf939-ca82-42e2-bfde-9567c5bf53bb@q30g2000prq.googlegroups.com>
Message-ID: <Q66dncpcAo8dtgrUnZ2dnUVZ_g6WnZ2d@pdx.net>

tripp wrote:
> ... dump the arrays to a binary file (much faster than dumping it to a text) 
 > from the fortran program....
> 
> How well does python handle binary files?  Maybe I could skit the f2py
> all together if I can get python to read the fortran binary file...

Likely your best plan.  Look into the numpy external package, because
those arrays are _far_ superior for actual calculation.  With numpy you
can do array_1 + array_2 without requiring a Python loop.  I'm sure
it has a way to read in binary arrays of the various data types.

--Scott David Daniels
Scott.Daniels at Acm.Org


From zubeido at yahoo.com.br  Sat Feb 14 15:46:25 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sat, 14 Feb 2009 12:46:25 -0800 (PST)
Subject: Rapidshare to Megaupload script
Message-ID: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>


I've made this script and would like to have some input and share it
with the community.
I also have a page with some code i produce on my spare time. http://pneves.net
Thanks

# -*- coding: utf-8 -*-
## I Paulo Neves am the owner of this script and i do not allow the
copy or distribution
## of this script without my permission to commercial purposes
## If you have any suggestions please mail me and i will reply and
post the on the site
from __future__ import with_statement
from urlparse import urljoin
import urllib2, urllib
import os, sys
import re
import ConfigParser


urls = []
acc_details = 0
firs_run = 0


def from_rapidshare(url):
    '''Check if this is a rapidshare link'''
    return (url.startswith("rapidshare.com") or
        url.startswith("www.rapidshare.com") or
        url.startswith("http://rapidshare.com") or
        url.startswith("http://www.rapidshare.com"))


def account_details():
    if os.environ.has_key("APPDATA") and os.path.exists(os.environ
["APPDATA"]):
        path = os.environ["APPDATA"] + "\\murs.cfg"
    else:
        path = os.path.expanduser("~") + "\.murs.cfg"

    if not os.path.exists(path):
        print path
        m_user = raw_input("Enter your user name for megaupload: ")
        m_password = raw_input("Enter your password for megaupload: ")
        r_user = raw_input("Enter your user name for rapidshare: ")
        r_password = raw_input("Enter your password for rapidshare: ")
        cfg = ConfigParser.SafeConfigParser()
        cfg.add_section('Acc_Details')
        cfg.set('Acc_Details', 'm_user ', m_user)
        cfg.set('Acc_Details', 'm_password', m_password)
        cfg.set('Acc_Details', 'r_user', r_user)
        cfg.set('Acc_Details', 'r_password', r_password)
        with open(path, 'wb') as configfile:
            cfg.write(configfile)

    cfg = ConfigParser.SafeConfigParser()
    cfg.read(path)
    try:
        m_user = cfg.get("Acc_Details", "m_user")
        m_password = cfg.get("Acc_Details", "m_password")
        r_user = cfg.get("Acc_Details", "r_user")
        r_password = cfg.get("Acc_Details", "r_password")
    except ConfigParser.NoSectionError or ConfigParser.NoOptionError:
        print "no section or No Option"
        print
        os.remove(path)
    return (m_user, m_password, r_user, r_password)

def cookie_processor(cookie):
    cookie = cookie.split("; ")
##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
(cookie) ) ] )
##    if cookie['user'] != None:
    return cookie
##    else:
##        print "Scheme has changed or authentication failes. Last
option most likely"
##        sys.exit()
##

def rs_auth(login):
    r_user = login[0]
    r_password = login[1]
    opener = urllib2.build_opener(urllib2.HTTPSHandler())
    urllib2.install_opener( opener )
    cred = urllib.urlencode({"login": r_user, "password": r_password})
    try:
        req = urllib2.urlopen("https://ssl.rapidshare.com/cgi-bin/
premiumzone.cgi", cred)
        cookie_rs = cookie_processor( req.headers.get("set-cookie",
"") )
    except  urllib2.URLError:
        print"Some error with the connection ocurred. Try again now or
later"
        sys.exit()
    #Returns the page if flag is set
    return req.read(), cookie_rs


def mu_auth(login):
    r_user = login[0]
    r_password = login[1]
    cred = urllib.urlencode({"login": r_user, "password": r_password})
    try:
        req = urllib2.urlopen("http://www.megaupload.com", cred)
        cookie_mu = cookie_processor( req.headers.get("set-cookie",
"") )

    except:
        print "Connection failed"
        sys.exit()


    #returns the authenticated header, in case future changes
specificaly ask the cookie it would be easy
    #to change code or even extract it from the header itself as a
dictionary key
    return cookie_mu

def set_rscookie_in_musite(cookie_mu, cookie_rs) :
    #it doesnt need to check for the cookie because it automaticaly
resets for the new value
    cookie_rs = cookie_rs.split("=",1)
    header = {"Content-type": "application/x-www-form-urlencoded",
"Accept": "text/plain", "cookie":cookie_mu}
    params = urllib.urlencode({'domain': "http://rapidshare.com",
'cookiename1': cookie_rs[0], 'cookievalue1': cookie[1] })
    req = urllib2.Request("http://www.megaupload.com/multifetch/?
c=cookies", params, header )
    print header
    print params
    #r = urllib2.urlopen(req)
    return True

acc_details = account_details()
if len(sys.argv)==1:
    print "Try -help for more information"
    sys.exit("No arguments")


if sys.argv[1] == "-h" or sys.argv[1] == "?help":
    print " > murs http://megaupload.com/?d=FILE1 ? http://megaupload.com/?d=FILEN"
    print " Download one or several rapidshare links passed as
argument separated by whitespace\n"
    print " >murs links.txt"
    print " Download a list of links from a file\n"
    print " >murs account"
    print " Automaticaly downloads the entire contents of your
account"
    sys.exit()
## Process the arguments
## AFTER THIS ITS ALL ROLLING


if sys.argv[1] == "account" or sys.argv[1] == "-a":
        #Getting the rapidshare user and password respectivelyfrom the
account details already called
        print acc_details[2:]
        page = rs_auth( acc_details[2:] )
        rex = re.findall('''Adliste\["(........|.)"\]\["filename"\] =
"(.*)"''', page[0])
        for retrieved_data in rex:
           #as there are two matches the retrieved_data is still a
list
           urls.append("http://rapidshare.com/files/" + retrieved_data
[0] + "/" + retrieved_data[1])

elif os.path.exists(sys.argv[1]): # If this is a file
    from_file = True
    l_file = sys.argv[1]
    print "Reading list of links from the file " , l_file
    print "\n"
    list_f = file(l_file, "r")
    urls = list_f.readlines()
    list_f.close()
    if not from_rapidshare(urls):
        sys.exit("Urls in text file were not valid")


elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
    for i in range(1, len(sys.argv)):
        if from_rapidshare(sys.argv[i]):
            urls.append(sys.argv[i])
else:
        print "This is not valid argument" , sys.argv[1]
        sys.exit()
urls = []

cookie_mu = mu_auth(acc_details[:2])
print cookie_mu
headers = {"User Agent": "Mozilla/5.0", "Accept": "text/plain",
"cookie":cookie_mu[0]}
for url in urls:
    try:
        params = urllib.urlencode({'srcurl': url, 'description':
"something"})
        req = urllib2.Request("http://megaupload.com/multifetch/",
params, headers )
        r = urllib2.urlopen(req)

    except:
         print "An error ocurred while trying to talk to megaupload.
Make sure you enter the correct password"


From tino at wildenhain.de  Sat Feb 14 15:54:25 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sat, 14 Feb 2009 21:54:25 +0100
Subject: PySerial "write" should accept "bytearray"
In-Reply-To: <49972dbc$0$1648$742ec2ed@news.sonic.net>
References: <49972dbc$0$1648$742ec2ed@news.sonic.net>
Message-ID: <49972F81.8020000@wildenhain.de>

John Nagle wrote:
>   PySerial, which is basically a binary input/output system, is
> still requiring "str" instead of "bytearray", even under Python 2.6.
> For "file-like objects", "write" functions are supposed to accept
> "bytearray" now, and "read" functions should return a "bytearray".
> 
I'm sure patches are welcome. And did you copy the pyserial author?

Regards
Tino
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From rt8396 at gmail.com  Sat Feb 14 16:10:31 2009
From: rt8396 at gmail.com (r)
Date: Sat, 14 Feb 2009 13:10:31 -0800 (PST)
Subject: ANN: SuPy - Script Sketchup with Python
References: <6v1u4pFho98dU1@mid.individual.net>
	<498C64E2.1050204@islandtraining.com> 
	<mailman.9001.1233949708.3487.python-list@python.org>
Message-ID: <b2564ff2-6365-40df-bb75-40bbadc9aaea@o2g2000prl.googlegroups.com>

Great work Greg, you are a Python zen master!


From nagle at animats.com  Sat Feb 14 16:16:14 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:16:14 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <mailman.9543.1234637591.3487.python-list@python.org>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
Message-ID: <49972cf5$0$1612$742ec2ed@news.sonic.net>

MRAB wrote:
> John Nagle wrote:
> [snip]
>> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
>> Python.  1 stop bit will not physically work on Baudot teletypes; the
>> main camshaft doesn't come around fast enough.  (Yes, there's an actual
>> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
>> Python level gets a reject at the Win32 level.  (Not sure why Win32
>> doesn't allow that; extra stop bits just add delay, but don't hurt
>> anything.  But it's not supported.)

    I patched PySerial to support "STOPBITS_ONE5", for 1.5 stop bits,
and the big Teletype Model 15 is now banging out text from Python.

    I actually put in "45.45" as the baud rate; it gets rounded down
to 45 for Windows, which works.  That won't work on Linux, though;
there's a canned list of speeds for POSIX serial ports.  (It's the
same list PDP-11 serial ports had in the 1970s, plus some later
extensions at the high end.)

    1.5 or 2 stop bits is acceptable for the old heavy iron, but 1.5
is preferred, because there's less vibration and wear.  With 2 stop bits,
the Teletype Model 15 clutch drops out on every character and the drive
train momentarily comes to a halt.   With 1.5, everything rotates steadily.

					John Nagle


From nagle at animats.com  Sat Feb 14 16:19:34 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:19:34 -0800
Subject: PySerial "write" should accept "bytearray"
Message-ID: <49972dbc$0$1648$742ec2ed@news.sonic.net>

   PySerial, which is basically a binary input/output system, is
still requiring "str" instead of "bytearray", even under Python 2.6.
For "file-like objects", "write" functions are supposed to accept
"bytearray" now, and "read" functions should return a "bytearray".

				John Nagle


From nagle at animats.com  Sat Feb 14 16:25:37 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 13:25:37 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <roy-0D11C8.14103914022009@news.panix.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
Message-ID: <49972f28$0$1622$742ec2ed@news.sonic.net>

Roy Smith wrote:
> In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
>  John Nagle <nagle at animats.com> wrote:
> 
>> At the hardware level, there's a clock rate, a counter, and a divisor, 
>> so arbitrary baud rates can be set.
> 
> Is that really true of modern hardware?  The last time I looked at serial 
> port hardware, UARTs took a base clock rate and divided it sequentially 
> with flip-flops to get all the possible rates (they usually had some ugly 
> logic to generate 110).  You were limited to the specific rates the 
> hardware gave you.  Is that no longer the case?

    It is, but the traditional serial clock rate is 115200 Hz, so you can use
any subdivision of that as a baud rate.  The divisor for 45.45 baud is
something like 2535.

    Some exotic serial port devices use a 16MHz clock; I've used those for
supporting SICK LMS laser rangerfinders at 500,000 baud.

					John Nagle


From thorsten at thorstenkampe.de  Sat Feb 14 16:35:12 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 14 Feb 2009 22:35:12 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
Message-ID: <MPG.2401577a930c03df9897c2@news.individual.de>

* Rhodri James (Fri, 13 Feb 2009 22:57:42 -0000)
> 
> On Fri, 13 Feb 2009 11:13:38 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
> wrote:
> 
> > OK, enough tinkering with the code and others matters on my end trying  
> > to find a work around. Somehow after much successful use of IDLE's  
> > execution facility, I've stepped on an invisible banana peel. I think  
> > it's evident that I'm not going around this problem easily with the IDLE  
> > execution attempts, and that another solution is required.
> 
> Congratulations, we've only been telling you this for the last few days.
> I wonder, is there any chance that you've noticed the solution given?

The Lord gives and the Lord takes. Sometimes it just takes a bit 
longer...

Thorsten


From thorsten at thorstenkampe.de  Sat Feb 14 16:37:52 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 14 Feb 2009 22:37:52 +0100
Subject: Untangling pythonWin and IDLE Processes on XP Pro
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<-5OdnU6H_-GbTgjUnZ2dnUVZ_h6dnZ2d@pdx.net>
	<mbsll.5218$%54.529@nlpi070.nbdc.sbc.com>
Message-ID: <MPG.2401581adea875e9897c3@news.individual.de>

* W. eWatson (Fri, 13 Feb 2009 20:58:33 -0800)
> Scott David Daniels wrote:
> > OK, you are using the oldest and least useful revision control
> > system, "rename and remember." I'd suggest you get and use bazaar,
> > but you'll just ask for shortcuts on how to use it without
> > understanding what it does.
> It works for me, and, frankly, I'm not interested in going to Linux,
> SunOS or other "revision systmes". These are way in my distant past,
> and the only reason I'm currently, and begrudgingly, once again
> writing programs is that the Python software program I am using is
> limited in its ability.

You, sir, certainly made my day. Thank you!

Thorsten


From google at mrabarnett.plus.com  Sat Feb 14 17:17:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 14 Feb 2009 22:17:09 +0000
Subject: Rapidshare to Megaupload script
In-Reply-To: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
Message-ID: <499742E5.9040000@mrabarnett.plus.com>

aiwarrior wrote:
> I've made this script and would like to have some input and share it
> with the community.
> I also have a page with some code i produce on my spare time. http://pneves.net
> Thanks
> 
[snip]
> 
> def from_rapidshare(url):
>     '''Check if this is a rapidshare link'''
>     return (url.startswith("rapidshare.com") or
>         url.startswith("www.rapidshare.com") or
>         url.startswith("http://rapidshare.com") or
>         url.startswith("http://www.rapidshare.com"))
> 
You can shorten:

     s.startswith(x) or s.startswith(y) or ...

to:

     s.startswith((x, y, ...))

[snip]
>     cfg = ConfigParser.SafeConfigParser()
>     cfg.read(path)
>     try:
>         m_user = cfg.get("Acc_Details", "m_user")
>         m_password = cfg.get("Acc_Details", "m_password")
>         r_user = cfg.get("Acc_Details", "r_user")
>         r_password = cfg.get("Acc_Details", "r_password")
>     except ConfigParser.NoSectionError or ConfigParser.NoOptionError:

In order to catch multiple exceptions it should be:

     except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):

>         print "no section or No Option"
>         print
>         os.remove(path)
>     return (m_user, m_password, r_user, r_password)
> 
> def cookie_processor(cookie):
>     cookie = cookie.split("; ")
> ##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
> (cookie) ) ] )
Or:
##    cookie = dict(x.split("=") for x in cookie)

> ##    if cookie['user'] != None:
When checking for None use "is" and "is not":
##    if cookie['user'] is not None:

>     return cookie
> ##    else:
> ##        print "Scheme has changed or authentication failes. Last
> option most likely"
> ##        sys.exit()
Raising an exception is better than exiting.

> ##
> 
[snip]
> def mu_auth(login):
>     r_user = login[0]
>     r_password = login[1]
>     cred = urllib.urlencode({"login": r_user, "password": r_password})
>     try:
>         req = urllib2.urlopen("http://www.megaupload.com", cred)
>         cookie_mu = cookie_processor( req.headers.get("set-cookie",
> "") )
> 
>     except:
Don't use an empty "except"; be explicit in which exception you want to 
catch .

[snip]
> 
> if sys.argv[1] == "-h" or sys.argv[1] == "?help":
Or:

     if sys.argv[1] in ("-h", "?help"):

[snip]

> elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
>     for i in range(1, len(sys.argv)):
Or:

     for arg in sys.argv[1 : ]:

and so on.

>         if from_rapidshare(sys.argv[i]):
>             urls.append(sys.argv[i])
> else:
>         print "This is not valid argument" , sys.argv[1]
>         sys.exit()
> urls = []
> 
[snip]
HTH


From nytrokiss at gmail.com  Sat Feb 14 17:27:47 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 15 Feb 2009 00:27:47 +0200
Subject: Rapidshare to Megaupload script
In-Reply-To: <499742E5.9040000@mrabarnett.plus.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<499742E5.9040000@mrabarnett.plus.com>
Message-ID: <8a6b8e350902141427y630b8daet537009181516e7f2@mail.gmail.com>

This can be used as a great guide on writing pythonic code. Don't look at
the specific code that is being corrected but look at how the improvements
are being presented.

I would recommend someone who is learning python read this guide.

On Sun, Feb 15, 2009 at 12:17 AM, MRAB <google at mrabarnett.plus.com> wrote:

> aiwarrior wrote:
>
>> I've made this script and would like to have some input and share it
>> with the community.
>> I also have a page with some code i produce on my spare time.
>> http://pneves.net
>> Thanks
>>
>>  [snip]
>
>>
>> def from_rapidshare(url):
>>    '''Check if this is a rapidshare link'''
>>    return (url.startswith("rapidshare.com") or
>>        url.startswith("www.rapidshare.com") or
>>        url.startswith("http://rapidshare.com") or
>>        url.startswith("http://www.rapidshare.com"))
>>
>>  You can shorten:
>
>    s.startswith(x) or s.startswith(y) or ...
>
> to:
>
>    s.startswith((x, y, ...))
>
> [snip]
>
>>    cfg = ConfigParser.SafeConfigParser()
>>    cfg.read(path)
>>    try:
>>        m_user = cfg.get("Acc_Details", "m_user")
>>        m_password = cfg.get("Acc_Details", "m_password")
>>        r_user = cfg.get("Acc_Details", "r_user")
>>        r_password = cfg.get("Acc_Details", "r_password")
>>    except ConfigParser.NoSectionError or ConfigParser.NoOptionError:
>>
>
> In order to catch multiple exceptions it should be:
>
>    except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
>
>         print "no section or No Option"
>>        print
>>        os.remove(path)
>>    return (m_user, m_password, r_user, r_password)
>>
>> def cookie_processor(cookie):
>>    cookie = cookie.split("; ")
>> ##    cookie = dict( [cookie[x].split("=") for x in xrange ( len
>> (cookie) ) ] )
>>
> Or:
> ##    cookie = dict(x.split("=") for x in cookie)
>
>  ##    if cookie['user'] != None:
>>
> When checking for None use "is" and "is not":
> ##    if cookie['user'] is not None:
>
>     return cookie
>> ##    else:
>> ##        print "Scheme has changed or authentication failes. Last
>> option most likely"
>> ##        sys.exit()
>>
> Raising an exception is better than exiting.
>
>  ##
>>
>>  [snip]
>
>> def mu_auth(login):
>>    r_user = login[0]
>>    r_password = login[1]
>>    cred = urllib.urlencode({"login": r_user, "password": r_password})
>>    try:
>>        req = urllib2.urlopen("http://www.megaupload.com", cred)
>>        cookie_mu = cookie_processor( req.headers.get("set-cookie",
>> "") )
>>
>>    except:
>>
> Don't use an empty "except"; be explicit in which exception you want to
> catch .
>
> [snip]
>
>>
>> if sys.argv[1] == "-h" or sys.argv[1] == "?help":
>>
> Or:
>
>    if sys.argv[1] in ("-h", "?help"):
>
> [snip]
>
>  elif from_rapidshare(sys.argv[1]): #if argument is one or more urls
>>    for i in range(1, len(sys.argv)):
>>
> Or:
>
>    for arg in sys.argv[1 : ]:
>
> and so on.
>
>         if from_rapidshare(sys.argv[i]):
>>            urls.append(sys.argv[i])
>> else:
>>        print "This is not valid argument" , sys.argv[1]
>>        sys.exit()
>> urls = []
>>
>>  [snip]
> HTH
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From pDOTpagel at wzw.tum.de  Sat Feb 14 17:31:29 2009
From: pDOTpagel at wzw.tum.de (Philipp Pagel)
Date: Sat, 14 Feb 2009 22:31:29 +0000 (UTC)
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
Message-ID: <gn7go0$jql$1@news.lrz-muenchen.de>

zaheer.agadi at gmail.com wrote:
> Hi

> How do i read  a file in Python and search a particular pattern
> like I have a file char.txt  which has

> Mango=sweet
> Sky=blue

> I want to get the strings sweet and blue,How to do this..?

If your entire file consists of such key=value pairs you may want to properly parse them:

for lne in infile:
	line = line.rstrip()
	key, value = line.split('=')
	if key in ('Mango', 'Sky'):
		print value

Or something like that - details depend on what exactly your criteria for
picking the values are, of course.

cu
	Philipp

-- 
Dr. Philipp Pagel
Lehrstuhl f. Genomorientierte Bioinformatik
Technische Universit?t M?nchen
http://mips.gsf.de/staff/pagel


From greg.ewing at canterbury.ac.nz  Sat Feb 14 18:29:40 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sun, 15 Feb 2009 12:29:40 +1300
Subject: ANN: SuPy 1.3
Message-ID: <mailman.9558.1234695122.3487.python-announce-list@python.org>

SuPy 1.3 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Added the rest of the promised functionality to the menus module
   (submenus and separators) and provided an example of its usage
   in examples.py.

- The scheme for preserving variables using a __keep__ attribute
   turned out to be fatally flawed. It has been replaced by a new
   mechanism using a keep() function instead. See the section on
   "Preserving Data" for details.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From rhodri at wildebst.demon.co.uk  Sat Feb 14 19:09:42 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 15 Feb 2009 00:09:42 -0000
Subject: Untangling pythonWin and IDLE Processes on XP Pro
In-Reply-To: <Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>
References: <%OUkl.6905$jZ1.2422@flpi144.ffdc.sbc.com>
	<6viopfFkcasmU1@mid.uni-berlin.de>
	<2NWkl.16040$YU2.9824@nlpi066.nbdc.sbc.com>
	<4ec6562a-08b2-4ec4-b9c0-e720e4ce7339@g38g2000yqd.googlegroups.com>
	<CqYkl.16674$yr3.1636@nlpi068.nbdc.sbc.com>
	<mailman.9419.1234461666.3487.python-list@python.org>
	<mR3ll.16704$yr3.290@nlpi068.nbdc.sbc.com>
	<5-KdnfUPXNqQSgnUnZ2dnUVZ_sudnZ2d@earthlink.com>
	<I35ll.16114$YU2.380@nlpi066.nbdc.sbc.com>
	<mailman.9470.1234502626.3487.python-list@python.org>
	<1Bcll.10420$hc1.4903@flpi150.ffdc.sbc.com>
	<mailman.9514.1234565868.3487.python-list@python.org>
	<Qksll.10716$pr6.769@flpi149.ffdc.sbc.com>
Message-ID: <op.upc9egb5a8ncjz@gnudebst>

On Sat, 14 Feb 2009 05:03:13 -0000, W. eWatson <notvalid2 at sbcglobal.net>  
wrote:

> See my response to Scott. Thanks for your reply.

I did.  It was fundamentally mistaken in so many respects that
I formally give up on you.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sou1980 at tellas.gr  Sat Feb 14 19:42:52 2009
From: sou1980 at tellas.gr (Tsolakos Stavros)
Date: Sun, 15 Feb 2009 02:42:52 +0200
Subject: GetKeyboardLayoutName Win32API
Message-ID: <gn7oei$1hmu$1@adenine.netfront.net>

Hi all.

I was trying to find a way to read the currently selected input layout
from an app written in python. I am aware that if the app were written
in C, I would have to call the GetKeyboardLayoutName() function. How can
this be done in Python? I want to avoid writing an extension just for
this. The function is not available through pywin32.

Thank you,
Stavros


From konteyaj at gmail.com  Sat Feb 14 22:30:40 2009
From: konteyaj at gmail.com (konteya joshi)
Date: Sat, 14 Feb 2009 19:30:40 -0800
Subject: ImportError: dynamic module does not define init function (inittypes)
Message-ID: <e9613a380902141930q381e91b5i98fad9326cfd3206@mail.gmail.com>

Hi,

Iam trying to run a programs which resides insides ..\pythonroot.

I see the following error on running the program:

'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "skyline\alpine_kickoff.py", line 6, in ?
    import re
  File "C:\Perforce\qa\testware\build\vmqa\python\python-2.4.1-as\lib\re.py",
line 5, in ?
    from sre import *
  File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\sre.py",
line 265, in ?
    import copy_reg
  File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\copy_reg.py",
line 7, in ?
    from types import ClassType as _ClassType
ImportError: dynamic module does not define init function (inittypes)

Any body who would have an idea on what might be going wrong?

I have python-2.4.1-as directory in my PYTHONPATH which contains the
Lib,libs...etc in the directory. The Lib contains the re,sre,copy_reg
inside the directory.

Thanks.


From steve at pearwood.info  Sat Feb 14 22:34:04 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 14:34:04 +1100
Subject: Function name limit in Python ?
References: <mailman.9531.1234622714.3487.python-list@python.org>
Message-ID: <01a782d5$0$14422$c3e8da3@news.astraweb.com>

Linuxguy123 wrote:

> Excuse my ignorance, but is there a limit to the size of function names
> in Python ?
> 
> I named a function getSynclientVersion() and I got an error when I
> called it.  

No no, don't tell us what error you got! I love guessing games. I'm guessing
you got either a SyntaxError or a NameError.


> I renamed the same function to getSCVersion() and it called 
> fine.

>>> def python_allows_really_long_function_names_with_no_problem():
...     print "hello world"
... 
>>> python_allows_really_long_function_names_with_no_problem()
hello world
>>>
>>> ptyhon_allows_really_long_function_names_with_no_problem()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'ptyhon_allows_really_long_function_names_with_no_problem'
is not defined

Can you spot the difference? More importantly, can you see how the error
message actually tells you what the error is?


-- 
Steven



From steve at pearwood.info  Sat Feb 14 22:44:45 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 14:44:45 +1100
Subject: String concatenation performance with +=
References: <2b2d6d33-f43d-4dd0-b881-1f4edb24ad2e@o2g2000prl.googlegroups.com>
	<slrngpdpt1.m13.nick@irishsea.home.craig-wood.com>
Message-ID: <01a78556$0$20669$c3e8da3@news.astraweb.com>

Nick Craig-Wood wrote:

> The optimized += depends on their being no other references to the
> string. ?Strings are immutable in python. ?So append must return a new
> string. ?However the += operation was optimised to do an in-place
> append if and only if there are no other references to the string.
> 
> You can see this demonstrated here
> 
> $ python -m timeit -s 'a="x"' 'a+="x"'
> 1000000 loops, best of 3: 0.231 usec per loop
> 
> $ python -m timeit -s 'a="x"; b=a' 's = a; a+="x"'
> 100000 loops, best of 3: 30.1 usec per loop

That is a fantastic explanation of why you shouldn't rely on the concat
optimization, although the assignment b=a in the setup isn't necessary and
is a little misleading. Thank you.


-- 
Steven



From grante at visi.com  Sun Feb 15 00:03:03 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:03:03 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <BcudnfxrPcOaPwrUnZ2dnUVZ_trinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> John Nagle wrote:
>
>>    OK, tried to open the port, using Python 2.6, latest PySerial
>> and PyWin32:
>> 
>>     ser = serial.Serial(port, baudrate=baud,
>>             bytesize=serial.FIVEBITS,
>>             parity=serial.PARITY_NONE,
>>             stopbits=serial.STOPBITS_TWO)
>> 
>> ValueError: Cannot configure port, some setting was wrong. Original 
>> message: (87, 'SetCommState', 'The parameter is incorrect.')
>> 
>>    Something doesn't like "serial.FIVEBITS".  That's a valid value, 
>> according
>> to "http://pyserial.wiki.sourceforge.net/pySerial".  If changed to 
>> "serial.EIGHTBITS",  the code will execute, but of course does the wrong
>> thing.   That looks like a bug.
>
>     OK, here's what's wrong.  The allowed numbers for stop bits in Windows are
>
> 	ONESTOPBIT	0	1 stop bit.
> 	ONE5STOPBITS	1	1.5 stop bits.
> 	TWOSTOPBITS	2	2 stop bits.
>
> The Python interface, however, only exports STOPBITS_ONE and STOPBITS_TWO.
> See "serialutil.py", at line 9, and "serialwin32.py" at lines 141-146.

That should be simple enough to fix.

> Linux has a different set of restrictions; Linux offers only 1 or 2 stop
> bits, and won't do arbitrary baud rates via the "termios" data structure,
> although there are other ways to request that.

It can be done via the ioctl that setserial uses, but that's
specific to a very few low-level drivers like the 16x50 one --
which is probably the one that matters to the OP, though he
hasn't said so.

-- 
Grant



From grante at visi.com  Sun Feb 15 00:23:16 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:23:16 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
	<49972f28$0$1622$742ec2ed@news.sonic.net>
Message-ID: <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> Roy Smith wrote:
>> In article <49970ce7$0$1665$742ec2ed at news.sonic.net>,
>>  John Nagle <nagle at animats.com> wrote:
>> 
>>> At the hardware level, there's a clock rate, a counter, and a
>>> divisor, so arbitrary baud rates can be set.
>> 
>> Is that really true of modern hardware?  The last time I
>> looked at serial port hardware, UARTs took a base clock rate
>> and divided it sequentially with flip-flops to get all the
>> possible rates (they usually had some ugly logic to generate
>> 110).  You were limited to the specific rates the hardware
>> gave you.  Is that no longer the case?
>
> It is, but the traditional serial clock rate is 115200 Hz, so
> you can use any subdivision of that as a baud rate.  The
> divisor for 45.45 baud is something like 2535.

On Linux IFF you're using a 16x50 UART, you can set arbitrary
divisors using the setserial utility.  From Python, you can
just invoke setserial (via os.system() or subprocess). It
should be pretty trivial: execute setserial with the parameters
"/dev/whatever spd_cust divisor 2535".  Then use the normal
calls to set the baud rate to 38400, and you should get 45.444
baud.  [Disclaimer: I haven't tested the above, and I may be
remembering it incorrectly.]

If that's too easy and you want to get your hands dirty, you
can look up the ioctl and parameter structure used by setserial
and invoke the ioctl directly from Python.

Neither method is portable to any other OS (or any other serial
driver, AFAIK).

> Some exotic serial port devices use a 16MHz clock; I've used
> those for supporting SICK LMS laser rangerfinders at 500,000
> baud.

:) 

Been there, done that -- along with that goofy checksum they
call a CRC.  They actually only do the CRC on one bit out of
every byte, and then they just xor in the rest of the byte.
It's very strange, rather slow, and not very good at detecting
errors.  A real, table-driven CRC would be both a lot faster
and a lot more robust.  My guess is that it was _supposed_ to
be a CRC routine, but somebody botched it.  They used the same
botched routine on the host end when they did testing, so
nobody noticed it was broken.  By the time anybody realized
that the CRC routine was broken, masked ROMs were in the field
and it was too late to fix it -- so they just documented the
"custom" algorithm in the manual and called it good.

-- 
Grant



From grante at visi.com  Sun Feb 15 00:25:12 2009
From: grante at visi.com (Grant Edwards)
Date: Sat, 14 Feb 2009 23:25:12 -0600
Subject: PySerial "write" should accept "bytearray"
References: <49972dbc$0$1648$742ec2ed@news.sonic.net>
Message-ID: <VJWdnZHZQsWlOgrUnZ2dnUVZ_rDinZ2d@posted.usinternet>

On 2009-02-14, John Nagle <nagle at animats.com> wrote:

> PySerial, which is basically a binary input/output system, is
> still requiring "str" instead of "bytearray", even under Python 2.6.
> For "file-like objects", "write" functions are supposed to accept
> "bytearray" now, and "read" functions should return a "bytearray".

I'm sure a patch would be happily accepted.  I don't use 2.6
yet, and I don't know if the other people who've worked on
pyserial do either.

-- 
Grant



From steve at pearwood.info  Sun Feb 15 00:27:53 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 16:27:53 +1100
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
	<gn7go0$jql$1@news.lrz-muenchen.de>
Message-ID: <01a79d80$0$20652$c3e8da3@news.astraweb.com>

Philipp Pagel wrote:

> zaheer.agadi at gmail.com wrote:
>> Hi
> 
>> How do i read  a file in Python and search a particular pattern
>> like I have a file char.txt  which has
> 
>> Mango=sweet
>> Sky=blue
> 
>> I want to get the strings sweet and blue,How to do this..?
> 
> If your entire file consists of such key=value pairs you may want to
> properly parse them:

The proper way to parse them would be with the ConfigParser module.

The only negative with ConfigParser is that it requires a section label. In
my experience it is quite common for INI files with only a single section
to leave out the label.


-- 
Steven



From steve at pearwood.info  Sun Feb 15 00:31:37 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 16:31:37 +1100
Subject: doctest fails to see tests in decorated functions
References: <01a66625$0$21875$c3e8da3@news.astraweb.com>
Message-ID: <01a79e61$0$20647$c3e8da3@news.astraweb.com>

Steven D'Aprano wrote:

> I've just spotted a bug in doctest that it fails to see tests inside
> decorated functions. It's been reported before:
> 
> http://bugs.python.org/issue1108
> 
> but the patch submitted doesn't work for me.

Never mind, it was a PEBCAK error. I failed to notice that applying a
decorator to a function shadows the functions docstring.

Normally I would use functools.wraps, but I am currently limping along on a
Python 2.4 installation here, which doesn't have it.


-- 
Steven



From michele.simionato at gmail.com  Sun Feb 15 00:35:49 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 14 Feb 2009 21:35:49 -0800 (PST)
Subject: doctest fails to see tests in decorated functions
References: <01a66625$0$21875$c3e8da3@news.astraweb.com>
	<01a79e61$0$20647$c3e8da3@news.astraweb.com>
Message-ID: <503ff63e-527a-4bed-a931-722b73d63989@i38g2000yqd.googlegroups.com>

On Feb 15, 6:31?am, Steven D'Aprano <st... at pearwood.info> wrote:
> Never mind, it was a PEBCAK error. I failed to notice that applying a
> decorator to a function shadows the functions docstring.
>
> Normally I would use functools.wraps, but I am currently limping along on a
> Python 2.4 installation here, which doesn't have it.

You may consider this: http://pypi.python.org/pypi/decorator

             M.S.


From lie.1296 at gmail.com  Sun Feb 15 00:56:17 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 15 Feb 2009 05:56:17 +0000 (UTC)
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
Message-ID: <gn8aq0$8rc$1@ger.gmane.org>

On Sat, 14 Feb 2009 22:10:41 -0800, John Nagle wrote:

>  >>> xx = b'x'

Isn't this creating a regular byte?

Shouldn't creation of bytearray be:

>>> xx = bytearray(b'x')




From max at alcyone.com  Sun Feb 15 00:58:54 2009
From: max at alcyone.com (Erik Max Francis)
Date: Sat, 14 Feb 2009 21:58:54 -0800
Subject: "Byte" type?
In-Reply-To: <4997aa38$0$1678$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
Message-ID: <go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>

John Nagle wrote:
>     With "bytearray", the element type is considered to be "unsigned byte",
> or so says PEP 3137: "The element data type is always 'B' (i.e. unsigned 
> byte)."
> 
> Let's try:
> 
> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit 
> (Intel)] on
> win32
>  >>> xx = b'x'
>  >>> repr(xx)
> "'x'"
>  >>> repr(xx[0])
> "'x'"
>  >>> repr(xx[0][0])
> "'x'"
>  >>>
> 
> But that's not what "repr" indicates.  The bytearray element is apparently
> being promoted to "bytes" as soon as it comes out of the array.

There's no distinction byte type.  A single character of a bytes type is 
also a bytes.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
   Did you ever love somebody / Did you ever really care
    -- Cassandra Wilson


From clp2 at rebertia.com  Sun Feb 15 01:06:42 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 14 Feb 2009 22:06:42 -0800
Subject: "Byte" type?
In-Reply-To: <gn8aq0$8rc$1@ger.gmane.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<gn8aq0$8rc$1@ger.gmane.org>
Message-ID: <50697b2c0902142206o6878b65ek7887eb4ce271b490@mail.gmail.com>

On Sat, Feb 14, 2009 at 9:56 PM, Lie Ryan <lie.1296 at gmail.com> wrote:
> On Sat, 14 Feb 2009 22:10:41 -0800, John Nagle wrote:
>
>>  >>> xx = b'x'
>
> Isn't this creating a regular byte?
>
> Shouldn't creation of bytearray be:
>
>>>> xx = bytearray(b'x')

Indeed, and slicing that does give back a single byte (which Python
represents as an integer):

>>> b = bytearray(b'abc')
>>> b[0]
97

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From nagle at animats.com  Sun Feb 15 01:10:41 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 14 Feb 2009 22:10:41 -0800
Subject: "Byte" type?
Message-ID: <4997aa38$0$1678$742ec2ed@news.sonic.net>

     With "bytearray", the element type is considered to be "unsigned byte",
or so says PEP 3137: "The element data type is always 'B' (i.e. unsigned byte)."

Let's try:

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on
win32
 >>> xx = b'x'
 >>> repr(xx)
"'x'"
 >>> repr(xx[0])
"'x'"
 >>> repr(xx[0][0])
"'x'"
 >>>

But that's not what "repr" indicates.  The bytearray element is apparently
being promoted to "bytes" as soon as it comes out of the array.

					John Nagle


From nihil.is at free.fr  Sun Feb 15 01:17:08 2009
From: nihil.is at free.fr (Sylvain Rabot)
Date: Sat, 14 Feb 2009 22:17:08 -0800
Subject: Setuptools & Python 3.0
Message-ID: <4997b3ae$0$20705$426a74cc@news.free.fr>

Hi,

I would like to know if the official maintainers of setuptools are working 
on a release for Python 3.0.

Regards. 



From steve at pearwood.info  Sun Feb 15 01:29:42 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 17:29:42 +1100
Subject: How to peek inside a decorated function
Message-ID: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>

Suppose I have a function f() which I know has been decorated, but I don't
have access to the original undecorated function any longer:

def reverse(func):
    def f(*args):
        args = list(args)
        args.reverse()
        return func(*args)
    return f

def say(*args):
    print args

rsay = reverse(say)
del say


Is there any way to peek inside the decorated function rsay() to get access
to the undecorated function say()?

If I look at the code object I can see a reference to the original:

>>> rsay.func_code.co_names
('list', 'args', 'reverse', 'func')

and if I disassemble the code object I can see it being dereferenced:

>>> dis.dis(rsay.func_code)
[snip for brevity]
  5          22 LOAD_DEREF               0 (func)
             25 LOAD_FAST                0 (args)
             28 CALL_FUNCTION_VAR        0
             31 RETURN_VALUE        

but if I look at the closure object, nothing seems useful:

>>> dir(rsay.func_closure[0])
['__class__', '__cmp__', '__delattr__', '__doc__', 
'__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__str__']


and I can't find any other attributes which refers back to the undecorated
original function.


-- 
Steven



From kentandkat at sbcglobal.net  Sun Feb 15 02:14:13 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Sun, 15 Feb 2009 01:14:13 -0600
Subject: python in emacs
Message-ID: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

When I visit a file with extension .py, emacs says "loading
python...done", and gives me a "python" menu with options like "start
interpreter" and "eval buffer". When I try to use one of these options
emacs says "loading compile...done", then hangs and has to be shut down
from the task manager. The Python folder is in my PATH variable and
works fine from the command line (or with IDLE). I'm using emacs-22.3 on
windows xp, and have the same problem with both python-2.2 and
python-3.0. Anybody got any tips, or should I just give up and use some
other editor?

Thanks,
Kent.


From srikrishnamohan at gmail.com  Sun Feb 15 02:38:31 2009
From: srikrishnamohan at gmail.com (km)
Date: Sun, 15 Feb 2009 16:38:31 +0900
Subject: multiprocessing python2.6.1
Message-ID: <f4cc03640902142338u32d04720hb45c61a8bd984cf4@mail.gmail.com>

Dear all,


I have a problem with multiprocessing module usage with python2.6.1
Here Pool object is to be instantiated with 50 processes  and the method
'run' has to be called with pool object.
My actual requirement is to reuse the 50 processes for further processing
until 100 items.

#########################
import multiprocessing as mp

def add(a,b):
    return a+b


if __name__ == '__main__':
    p = mp.Pool(processes=50)
    y = 40
    for x in  range(100):
        p.apply_async(run, (x, y) )
##########################
The problem now is that it creates only 32 processes (and not more) and
exits with processing first 32 numbers  from range(100) .
Is there a cap on the number of subprocesses one can fork ?
Even then,  once these 32 processes r free, I would like to reuse them with
next 32 inputs (x) from  range(100 ) in that order.
how could i accomplish this ?

thanks in advance.
KM
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From tjreedy at udel.edu  Sun Feb 15 03:43:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 03:43:57 -0500
Subject: How to peek inside a decorated function
In-Reply-To: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn8kkc$q3l$1@ger.gmane.org>

Steven D'Aprano wrote:
> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get access
> to the undecorated function say()?
> 
> If I look at the code object I can see a reference to the original:
> 
>>>> rsay.func_code.co_names
> ('list', 'args', 'reverse', 'func')
> 
> and if I disassemble the code object I can see it being dereferenced:
> 
>>>> dis.dis(rsay.func_code)
> [snip for brevity]
>   5          22 LOAD_DEREF               0 (func)
>              25 LOAD_FAST                0 (args)
>              28 CALL_FUNCTION_VAR        0
>              31 RETURN_VALUE        
> 
> but if I look at the closure object, nothing seems useful:
> 
>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__', 
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']
> 
> 
> and I can't find any other attributes which refers back to the undecorated
> original function.

In 3.0, rsay.__closure__[0].cell_contents would be the original function 
object.



From zaheer.agadi at gmail.com  Sun Feb 15 03:55:52 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 15 Feb 2009 00:55:52 -0800 (PST)
Subject: Reading a file
References: <a747738f-2ab9-48f5-ae81-b8af8e7360ea@v5g2000prm.googlegroups.com>
	<gn7go0$jql$1@news.lrz-muenchen.de>
	<01a79d80$0$20652$c3e8da3@news.astraweb.com>
Message-ID: <093cb726-76e5-421d-8ed3-9547bcd0f3e6@a39g2000prl.googlegroups.com>

On Feb 15, 10:27?am, Steven D'Aprano <st... at pearwood.info> wrote:
> Philipp Pagel wrote:
> > zaheer.ag... at gmail.com wrote:
> >> Hi
>
> >> How do i read ?a file in Python and search a particular pattern
> >> like I have a file char.txt ?which has
>
> >> Mango=sweet
> >> Sky=blue
>
> >> I want to get the strings sweet and blue,How to do this..?
>
> > If your entire file consists of such key=value pairs you may want to
> > properly parse them:
>
> The proper way to parse them would be with the ConfigParser module.
>
> The only negative with ConfigParser is that it requires a section label. In
> my experience it is quite common for INI files with only a single section
> to leave out the label.
>
> --
> Steven

Thanks to all of you,I used to ConfigParser worked fine.

-Zaheer


From __peter__ at web.de  Sun Feb 15 04:05:32 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 15 Feb 2009 10:05:32 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn8lsr$nea$01$1@news.t-online.com>

Steven D'Aprano wrote:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get
> access to the undecorated function say()?
> 
> If I look at the code object I can see a reference to the original:
> 
>>>> rsay.func_code.co_names
> ('list', 'args', 'reverse', 'func')
> 
> and if I disassemble the code object I can see it being dereferenced:
> 
>>>> dis.dis(rsay.func_code)
> [snip for brevity]
>   5          22 LOAD_DEREF               0 (func)
>              25 LOAD_FAST                0 (args)
>              28 CALL_FUNCTION_VAR        0
>              31 RETURN_VALUE
> 
> but if I look at the closure object, nothing seems useful:
> 
>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__',
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']
> 
> 
> and I can't find any other attributes which refers back to the undecorated
> original function.
> 
> 

Following Terry's lead it turns out that cell contents become easily
accessible in python 2.5:

$ cat cellcontents.py
"""
>>> def reverse(func):
...     def f(*args):
...         args = list(args)
...         args.reverse()
...         return func(*args)
...     return f
...
>>> def say(*args):
...     print args
...
>>> rsay = reverse(say)
>>> del say
>>> c = rsay.func_closure[0]
>>> "cell_contents" in dir(c)
True
>>> c.cell_contents(1,2,3)
(1, 2, 3)
>>>
"""

import doctest
doctest.testmod()
$ python2.6 cellcontents.py
$ python2.5 cellcontents.py
$ python2.4 cellcontents.py
**********************************************************************
File "cellcontents.py", line 15, in __main__
Failed example:
    "cell_contents" in dir(c)
Expected:
    True
Got:
    False
**********************************************************************
File "cellcontents.py", line 17, in __main__
Failed example:
    c.cell_contents(1,2,3)
Exception raised:
    Traceback (most recent call last):
      File "doctest.py", line 1248, in __run
        compileflags, 1) in test.globs
      File "<doctest __main__[6]>", line 1, in ?
        c.cell_contents(1,2,3)
    AttributeError: 'cell' object has no attribute 'cell_contents'
**********************************************************************
1 items had failures:
   2 of   7 in __main__
***Test Failed*** 2 failures.

Peter


From mail at timgolden.me.uk  Sun Feb 15 04:53:24 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 15 Feb 2009 09:53:24 +0000
Subject: GetKeyboardLayoutName Win32API
In-Reply-To: <gn7oei$1hmu$1@adenine.netfront.net>
References: <gn7oei$1hmu$1@adenine.netfront.net>
Message-ID: <4997E614.2080209@timgolden.me.uk>

Tsolakos Stavros wrote:
> Hi all.
> 
> I was trying to find a way to read the currently selected input layout
> from an app written in python. I am aware that if the app were written
> in C, I would have to call the GetKeyboardLayoutName() function. How can
> this be done in Python? I want to avoid writing an extension just for
> this. The function is not available through pywin32.

<code>
import ctypes

s = ctypes.create_unicode_buffer (1024)
ctypes.windll.user32.GetKeyboardLayoutNameW (s)

print s.value

</code>

TJG


From mail at microcorp.co.za  Sun Feb 15 05:04:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:04:37 +0200
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net><-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<4996F7A0.4060008@mrabarnett.plus.com>
Message-ID: <000201c98f58$2f7ec160$0d00a8c0@hendrik>

"MRAB" <google at m...tt.plus.com> wrote:

> Grant Edwards wrote:
> > On 2009-02-14, John Nagle <nagle at animats.com> wrote:
> > 
> >> Can Python's serial port support be made to run at 45.45 baud,
> >> the old "60 speed" Teletype machine speed? 
> > 
> > If your hardware and OS supports it, Python can be made to
> > support it.
> > 
> [snip]
> I had a quick look at the Windows API. The struct member for the baud
> rate is of type DWORD, ie an integer.

I think there could be other hassles - the baud rate is basically derived
by setting a divisor that divides a high frequency clock that is
fed to the UART chip. Now this means that the frequency, 
and the maximum value of the divisor, defines the lowest
rate that can be attained.  The chips are standard, so the maximum
divisor is fixed, but the frequency fed the chip is a design parameter
of the motherboard.

So you could be lucky, or you might have to change the hardware...

- Hendrik





From stefan_ml at behnel.de  Sun Feb 15 05:05:34 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 15 Feb 2009 11:05:34 +0100
Subject: ImportError: dynamic module does not define init function
	(inittypes)
In-Reply-To: <mailman.9551.1234668644.3487.python-list@python.org>
References: <mailman.9551.1234668644.3487.python-list@python.org>
Message-ID: <4997e8ee$0$31879$9b4e6d93@newsspool3.arcor-online.net>

konteya joshi wrote:
> I see the following error on running the program:
> 
> 'import site' failed; use -v for traceback
> Traceback (most recent call last):
>   File "skyline\alpine_kickoff.py", line 6, in ?
>     import re
>   File "C:\Perforce\qa\testware\build\vmqa\python\python-2.4.1-as\lib\re.py",
> line 5, in ?
>     from sre import *
>   File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\sre.py",
> line 265, in ?
>     import copy_reg
>   File "C:\Per\qa\test\build\vmqa\python\python-2.4.1-as\lib\copy_reg.py",
> line 7, in ?
>     from types import ClassType as _ClassType
> ImportError: dynamic module does not define init function (inittypes)
> 
> Any body who would have an idea on what might be going wrong?
> 
> I have python-2.4.1-as directory in my PYTHONPATH which contains the
> Lib,libs...etc in the directory. The Lib contains the re,sre,copy_reg
> inside the directory.

Check if you have a file "types.dll" somewhere in your PYTHONPATH. If
Python finds such a file when resolving the "import types" statement, it
will try to import the DLL instead of the correct module.

Stefan


From mail at microcorp.co.za  Sun Feb 15 05:18:37 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:18:37 +0200
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net><-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet><49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
Message-ID: <000301c98f58$30144aa0$0d00a8c0@hendrik>

"John Nagle" <nagle at ...ats.com>wrote:


> So the correct combination, 5 bits with 1.5 stop bits, isn't supported in
> Python.  1 stop bit will not physically work on Baudot teletypes; the
> main camshaft doesn't come around fast enough.  (Yes, there's an actual
> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
> Python level gets a reject at the Win32 level.  (Not sure why Win32
> doesn't allow that; extra stop bits just add delay, but don't hurt
> anything.  But it's not supported.)

If you can get down so low in baud rate, then you can fudge it in software.
Set the port to the single stop bit, and make a transmit character function
that outputs a single character and a flush(), and then waits for a bit time 
or so - time.sleep(0.022) will do the trick - means you have to make
a string transmitter that calls your character transmitter - you cannot
just write a string to the port - but that is no great hardship.

The receive side will not be a problem, as the syncing is done every char.

- Hendrik




From hniksic at xemacs.org  Sun Feb 15 05:27:36 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 15 Feb 2009 11:27:36 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <87ocx4hu5j.fsf@mulj.homelinux.net>

Steven D'Aprano <steve at pearwood.info> writes:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
>
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
>
> def say(*args):
>     print args
>
> rsay = reverse(say)
> del say
>
> Is there any way to peek inside the decorated function rsay() to get access
> to the undecorated function say()?

This works in Python 2.5.2:

>>> rsay.func_closure[0].cell_contents
<function say at 0xb7e67224>

Of course, this applies only if you know there's only one free
variable, and you know that the decorator is in fact implemented with
a closure, and so on.

>>>> dir(rsay.func_closure[0])
> ['__class__', '__cmp__', '__delattr__', '__doc__', 
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__setattr__', '__str__']

I got 'cell_contents' as well when I did the 'dir', at least under
Python 2.5.2.


From mail at microcorp.co.za  Sun Feb 15 05:40:34 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 15 Feb 2009 12:40:34 +0200
Subject: Fw: Can Python serial support run at 45.45 baud?
Message-ID: <001201c98f59$d53a5140$0d00a8c0@hendrik>

"Hendrik van Rooyen" <ma... at m....orp.co.za> wrote:

> If you can get down so low in baud rate, then you can fudge it in software.
> Set the port to the single stop bit, and make a transmit character function
> that outputs a single character and a flush(), and then waits for a bit time 
> or so - time.sleep(0.022) will do the trick - means you have to make
> a string transmitter that calls your character transmitter - you cannot
> just write a string to the port - but that is no great hardship.

Talking nonsense again - the sleep time must not be just the bit
you want to add to the character, but the full character time,
start bit, five data, stop + 1/2 bit time. - 7.5 * 22 = 165 milliseconds.

- Hendrik




From castironpi at gmail.com  Sun Feb 15 05:48:08 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Sun, 15 Feb 2009 02:48:08 -0800 (PST)
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
Message-ID: <4af8fc75-c2ef-4c9c-8829-560a9ae4df6c@r34g2000vbp.googlegroups.com>

On Feb 15, 4:27?am, Hrvoje Niksic <hnik... at xemacs.org> wrote:
> Steven D'Aprano <st... at pearwood.info> writes:
> > Suppose I have a function f() which I know has been decorated, but I don't
> > have access to the original undecorated function any longer:
>
> > def reverse(func):
> > ? ? def f(*args):
> > ? ? ? ? args = list(args)
> > ? ? ? ? args.reverse()
> > ? ? ? ? return func(*args)
> > ? ? return f
>
> > def say(*args):
> > ? ? print args
>
> > rsay = reverse(say)
> > del say
>
> > Is there any way to peek inside the decorated function rsay() to get access
> > to the undecorated function say()?
>
> This works in Python 2.5.2:
>
> >>> rsay.func_closure[0].cell_contents
>
> <function say at 0xb7e67224>
>
> Of course, this applies only if you know there's only one free
> variable, and you know that the decorator is in fact implemented with
> a closure, and so on.
>
> >>>> dir(rsay.func_closure[0])
> > ['__class__', '__cmp__', '__delattr__', '__doc__',
> > '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> > '__reduce_ex__', '__repr__', '__setattr__', '__str__']
>
> I got 'cell_contents' as well when I did the 'dir', at least under
> Python 2.5.2.

Assume the decorator preserves the function at all; that is, it
doesn't discard it.  Then you can scan func_closure.  In poor cases,
you might have to search through a nested decoration as well.  In
others, such as when the decorator is an object, not a function, you
might have to search an instance dictionary, also possibly nested.
The leading assumption also requires that the function is stored in a
Python object; that is, not in a C structure.

In Python 3.0.1:

>>> def f( fun ):
...     def g( *ar, **kw ):
...             return fun( *ar, **kw )
...     return g
...
>>> def h( x ):
...     print( x )
...
>>> i= f( h )
>>> i.__closure__[0].cell_contents
<function h at 0x00B59810>


From zaheer.agadi at gmail.com  Sun Feb 15 05:55:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sun, 15 Feb 2009 02:55:41 -0800 (PST)
Subject: Python WebDAV library
Message-ID: <75f5d38b-bb93-4d9d-bc64-d073ee0c1992@w1g2000prm.googlegroups.com>

Hi

I am looking for  WebDAV library in Python

I found one in
http://users.sfo.com/~jdavis/Software/PyDAV/readme.html
and one here
http://pypi.python.org/packages/any/P/Python_WebDAV_Library/


I basically have to upload and download files/folders to/from a server
should be able to copy them move them and delete.

Any body know if these serve the purpose or there are   libraries more
promising than listed above

Thanks






From steve at pearwood.info  Sun Feb 15 06:39:32 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 15 Feb 2009 22:39:32 +1100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
Message-ID: <01a7f49a$0$11497$c3e8da3@news.astraweb.com>

Hrvoje Niksic wrote:

>> Is there any way to peek inside the decorated function rsay() to get
>> access to the undecorated function say()?
> 
> This works in Python 2.5.2:
> 
>>>> rsay.func_closure[0].cell_contents
> <function say at 0xb7e67224>

Thanks to everyone who responded.


The reason I ask is because I've just spent the weekend battling with
doctests of decorated functions, and discovering that without
functools.wraps() all my doctests weren't being called. I'm wondering
whether it would be a good idea for doctest to auto-detect tests in
closures.

This is not needed if you call wraps() appropriately, but you might not
always do that.



-- 
Steven



From __peter__ at web.de  Sun Feb 15 07:23:33 2009
From: __peter__ at web.de (Peter Otten)
Date: Sun, 15 Feb 2009 13:23:33 +0100
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <gn91g3$umj$00$1@news.t-online.com>

Steven D'Aprano wrote:

> Suppose I have a function f() which I know has been decorated, but I don't
> have access to the original undecorated function any longer:
> 
> def reverse(func):
>     def f(*args):
>         args = list(args)
>         args.reverse()
>         return func(*args)
>     return f
> 
> def say(*args):
>     print args
> 
> rsay = reverse(say)
> del say
> 
> 
> Is there any way to peek inside the decorated function rsay() to get
> access to the undecorated function say()?

Here's a hack for Python 2.4:

def make_extractor(x=None):
    def extractor(): return x
    return extractor

extractor = make_extractor()
function = type(extractor)

def get_cell_contents(cell):
    return function(extractor.func_code, {}, "yadda", None, (cell,))()

get_cell_contents(rsay.func_closure[0])(1,2,3)

Peter


From duncan.booth at invalid.invalid  Sun Feb 15 07:52:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 15 Feb 2009 12:52:12 GMT
Subject: How to peek inside a decorated function
References: <01a7abfe$0$20629$c3e8da3@news.astraweb.com>
	<87ocx4hu5j.fsf@mulj.homelinux.net>
	<01a7f49a$0$11497$c3e8da3@news.astraweb.com>
Message-ID: <Xns9BB382D534088duncanbooth@127.0.0.1>

Steven D'Aprano <steve at pearwood.info> wrote:
> 
> The reason I ask is because I've just spent the weekend battling with
> doctests of decorated functions, and discovering that without
> functools.wraps() all my doctests weren't being called. I'm wondering
> whether it would be a good idea for doctest to auto-detect tests in
> closures.
> 
> This is not needed if you call wraps() appropriately, but you might not
> always do that.
> 

I don't think it is a good idea to call the wrapped doctests automatically, 
but I do think it might be a good idea to detect and warn about anything 
which looks like it is a wrapper where the wrapped function includes a 
doctest and the wrapper doesn't.


-- 
Duncan Booth http://kupuguy.blogspot.com


From steve at holdenweb.com  Sun Feb 15 07:53:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 07:53:44 -0500
Subject: Who's on First, IDLE or pythonWin? Dialog Problem?
In-Reply-To: <pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>
References: <P%Ckl.4192$PE4.3093@nlpi061.nbdc.sbc.com>	<mailman.9340.1234370960.3487.python-list@python.org>	<iPFkl.10313$hc1.8681@flpi150.ffdc.sbc.com>	<mailman.9344.1234381941.3487.python-list@python.org>	<1a05ac6c-9c7e-4411-a702-99bae941f948@h20g2000yqn.googlegroups.com>	<x7Nkl.22666$ZP4.3675@nlpi067.nbdc.sbc.com>
	<pcNkl.22668$ZP4.14599@nlpi067.nbdc.sbc.com>
Message-ID: <gn938s$rhc$1@ger.gmane.org>

W. eWatson wrote:
> It looks like I got an accidentally case of send message 3 times. Well,
> here's a correct below.
>> The question now is what can I do about it? reboot?
>>
>> Just to re-iterate the answer I provided to *>the question to a post
>> above<*, I'm using Tkinter for the program's GUI.
>>
> 
> 
Just stop running the damned thing under IDLE.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 15 08:03:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 08:03:42 -0500
Subject: hpw to convert a linux python script ?
In-Reply-To: <7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>
References: <mailman.9346.1234382315.3487.python-list@python.org>	<8848a16f-83db-4acf-a1cc-46653869f27c@z1g2000yqn.googlegroups.com>	<mailman.9352.1234385290.3487.python-list@python.org>	<1ac73184-be09-4b56-8ad1-7cd4896e0f7c@z6g2000pre.googlegroups.com>	<gn20f7$d0e$1@ger.gmane.org>
	<7a9c25c20902122237i125b8610v1d553979c98a95c9@mail.gmail.com>
Message-ID: <gn93ri$sm0$1@ger.gmane.org>

Stephen Hansen wrote:
>> # Absolute path to the directory that holds media.
>> # Example: "/home/media/media.lawrence.com/"
>> MEDIA_ROOT = fsroot+'/Projects/PytDj/images/'
>>
>> Note that most Windows APIs allow you to use the forward slash as a
>> delimiter. It's mostly the command line and Windows Explorer that are
>> snotty about insisting on the backslash.
> 
> Idle curiosity, why do you prefer that to:
> 
> MEDIA_ROOT = os.path.join(fsroot, 'Projects', 'PytDj', 'images')
> 
> Not arguing that one is actually better then the other, just curious.
> 
Going for "good enough", I suppose. It's more readable, at least, not
that that makes a *huge* difference.

> In my own environment we have grown a whole big filesystem abstraction
> layer because we have to be able to address the same resources on
> network volumes in the same client on multiple OS's (mainly windows
> and mac presently, but a linux client has long been a
> consideration),... and on the mac having to sometimes use mac paths
> (":this:that:other") and sometimes posix paths ("/this/that/other")
> depending on what API layer I'm poking at in a given point of view...
> so personally I just end up being mildly curious how everyone else
> handles paths and such.
> 
> Cuz it was quite a bit of a pain early on.

The old Mac paths would indeed require your solution, which is strictly
speaking the best.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Sun Feb 15 08:05:04 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 15 Feb 2009 14:05:04 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <87vdrciysm.fsf@mulj.homelinux.net>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
Message-ID: <6vqi81FliulnU1@mid.uni-berlin.de>

Hrvoje Niksic schrieb:
> "Diez B. Roggisch" <deets at nospam.web.de> writes:
> 
>> The answer is easy: if you use C, you can use ctypes to create a
>> wrapper - with pure python, no compilation, no platform issues.
> 
> The last part is not true.  ctypes doesn't work on 64-bit
> architectures, nor does it work when Python is built with non-gcc Unix
> compilers.

It's not working on Windows with the standard distribution?

I'm sorry for spreading FUD about being no issues at all, that 
apparently wasn't right - however, so far I didn't encounter them.

Diez


From steve at holdenweb.com  Sun Feb 15 08:41:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 08:41:17 -0500
Subject: "Byte" type?
In-Reply-To: <go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
Message-ID: <gn9621$2hk$1@ger.gmane.org>

Erik Max Francis wrote:
> John Nagle wrote:
>>     With "bytearray", the element type is considered to be "unsigned
>> byte",
>> or so says PEP 3137: "The element data type is always 'B' (i.e.
>> unsigned byte)."
>>
>> Let's try:
>>
>> Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
>> (Intel)] on
>> win32
>>  >>> xx = b'x'
>>  >>> repr(xx)
>> "'x'"
>>  >>> repr(xx[0])
>> "'x'"
>>  >>> repr(xx[0][0])
>> "'x'"
>>  >>>
>>
>> But that's not what "repr" indicates.  The bytearray element is
>> apparently
>> being promoted to "bytes" as soon as it comes out of the array.
> 
> There's no distinction byte type.  A single character of a bytes type is
> also a bytes.
> 
Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
to enable easier forward compatibility with the 3.X series ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From roy at panix.com  Sun Feb 15 08:51:29 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 08:51:29 -0500
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<roy-0D11C8.14103914022009@news.panix.com>
	<49972f28$0$1622$742ec2ed@news.sonic.net>
	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>
Message-ID: <roy-7CAA41.08512915022009@news.panix.com>

In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>,
 Grant Edwards <grante at visi.com> wrote:

> My guess is that it was _supposed_ to
> be a CRC routine, but somebody botched it.  They used the same
> botched routine on the host end when they did testing, so
> nobody noticed it was broken. 

Stuff like this happens all the time.  That's why RFC 2026 requires, "a 
specification from which at least two independent and interoperable 
implementations from different code bases have been developed".

To drag this back on topic, however, it's interesting to note that Python 
itself has been successful, while still being essentially a single 
implementation.


From benjamin at python.org  Sun Feb 15 09:32:15 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Sun, 15 Feb 2009 14:32:15 +0000 (UTC)
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
Message-ID: <loom.20090215T143129-868@post.gmane.org>

Steve Holden <steve <at> holdenweb.com> writes:
> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
> to enable easier forward compatibility with the 3.X series ...

It's not an ugly hack. It just isn't all that you might hope it'd live up to be.






From theller at python.net  Sun Feb 15 09:45:10 2009
From: theller at python.net (Thomas Heller)
Date: Sun, 15 Feb 2009 15:45:10 +0100
Subject: Easier to wrap C or C++ libraries?
In-Reply-To: <mailman.9545.1234642143.3487.python-list@python.org>
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>	<6vocf5Fkv5a9U1@mid.uni-berlin.de>	<87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
Message-ID: <6vqo3kFlerq0U1@mid.individual.net>

Christian Heimes schrieb:
> Hrvoje Niksic schrieb:
>> "Diez B. Roggisch" <deets at nospam.web.de> writes:
>> 
>>> The answer is easy: if you use C, you can use ctypes to create a
>>> wrapper - with pure python, no compilation, no platform issues.
>> 
>> The last part is not true.  ctypes doesn't work on 64-bit
>> architectures, nor does it work when Python is built with non-gcc Unix
>> compilers
> 
> ctypes works on 64bit systems, too. However it's a pain in the ... back
> to write code with ctypes that works across all platforms. I used to use
> ctypes for wrapper but eventually I switched to Cython.
> 

I have plans to add the types from the ansi-c standard to ctypes, like these:

stddef.h: ptrdiff_t, size_t, wchar_t
signal.h: sig_atomic_t
stdio.h: FILE, fpos_t, stderr, stdout, stdin
stdlib.h: div_t, ldiv_t
time.h: clock_t, time_t, struct tm

Do you think that would have helped for writing cross-platform wrappers?

Thomas


From google at mrabarnett.plus.com  Sun Feb 15 09:56:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 14:56:12 +0000
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <roy-7CAA41.08512915022009@news.panix.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>	<roy-0D11C8.14103914022009@news.panix.com>	<49972f28$0$1622$742ec2ed@news.sonic.net>	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>
	<roy-7CAA41.08512915022009@news.panix.com>
Message-ID: <49982D0C.8020604@mrabarnett.plus.com>

Roy Smith wrote:
> In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>, 
> Grant Edwards <grante at visi.com> wrote:
> 
>> My guess is that it was _supposed_ to be a CRC routine, but
>> somebody botched it.  They used the same botched routine on the
>> host end when they did testing, so nobody noticed it was broken.
> 
> Stuff like this happens all the time.  That's why RFC 2026 requires,
> "a specification from which at least two independent and
> interoperable implementations from different code bases have been
> developed".
> 
> To drag this back on topic, however, it's interesting to note that
> Python itself has been successful, while still being essentially a
> single implementation.
> 
That's because it's open source, so many people can test and debug it.


From deets at nospam.web.de  Sun Feb 15 10:23:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 15 Feb 2009 16:23:00 +0100
Subject: python in emacs
In-Reply-To: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
References: <u63jcp3y2.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
Message-ID: <6vqqakFlct0rU1@mid.uni-berlin.de>

kentandkat at sbcglobal.net schrieb:
> When I visit a file with extension .py, emacs says "loading
> python...done", and gives me a "python" menu with options like "start
> interpreter" and "eval buffer". When I try to use one of these options
> emacs says "loading compile...done", then hangs and has to be shut down
> from the task manager. The Python folder is in my PATH variable and
> works fine from the command line (or with IDLE). I'm using emacs-22.3 on
> windows xp, and have the same problem with both python-2.2 and
> python-3.0. Anybody got any tips, or should I just give up and use some
> other editor?

Did you try setting the python interpreter with the full path?

Diez


From steve at holdenweb.com  Sun Feb 15 10:32:33 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 10:32:33 -0500
Subject: "Byte" type?
In-Reply-To: <loom.20090215T143129-868@post.gmane.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org>
	<loom.20090215T143129-868@post.gmane.org>
Message-ID: <gn9cim$ldf$1@ger.gmane.org>

Benjamin Peterson wrote:
> Steve Holden <steve <at> holdenweb.com> writes:
>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>> to enable easier forward compatibility with the 3.X series ...
> 
> It's not an ugly hack. It just isn't all that you might hope it'd live up to be.
> 
I take it back
It's not an ugly hack
It's just an aliased type

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 15 10:33:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 10:33:57 -0500
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49982D0C.8020604@mrabarnett.plus.com>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>	<roy-0D11C8.14103914022009@news.panix.com>	<49972f28$0$1622$742ec2ed@news.sonic.net>	<VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d@posted.usinternet>	<roy-7CAA41.08512915022009@news.panix.com>
	<49982D0C.8020604@mrabarnett.plus.com>
Message-ID: <gn9cl9$ldf$2@ger.gmane.org>

MRAB wrote:
> Roy Smith wrote:
>> In article <VJWdnZbZQsVZOwrUnZ2dnUVZ_rDinZ2d at posted.usinternet>, Grant
>> Edwards <grante at visi.com> wrote:
>>
>>> My guess is that it was _supposed_ to be a CRC routine, but
>>> somebody botched it.  They used the same botched routine on the
>>> host end when they did testing, so nobody noticed it was broken.
>>
>> Stuff like this happens all the time.  That's why RFC 2026 requires,
>> "a specification from which at least two independent and
>> interoperable implementations from different code bases have been
>> developed".
>>
>> To drag this back on topic, however, it's interesting to note that
>> Python itself has been successful, while still being essentially a
>> single implementation.
>>
> That's because it's open source, so many people can test and debug it.

IronPython, J(P)ython and PyPy? TinyPython? Jython must be over ten
years old now.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From kentandkat at sbcglobal.net  Sun Feb 15 10:40:55 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Sun, 15 Feb 2009 09:40:55 -0600
Subject: python in emacs 
Message-ID: <ur61zhfnc.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

When I visit a file with extension .py, emacs says "loading
Python...done" and gives me a "Python" menu with options like "start
interpreter" and "eval buffer". When I try to use these options, or
others on the "Python" menu, emacs
says "loading compile...done", then hangs and has to be shut down from
the task bar. The folder containing python is in my PATH and python
works from the command line (and IDLE). Neither the emacs nor the python
directory tree has any spaces in it. I'm using emacs-22.3 on windows
xp and have tried using both python-2.2 and python-3.0 in emacs with the
same problem. Can anyone give me a tip?

Thanks,
Kent.


From nick at craig-wood.com  Sun Feb 15 11:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sun, 15 Feb 2009 10:31:55 -0600
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de> <87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
Message-ID: <slrngpgdb7.ug6.nick@irishsea.home.craig-wood.com>

Christian Heimes <lists at cheimes.de> wrote:
>  Hrvoje Niksic schrieb:
> > "Diez B. Roggisch" <deets at nospam.web.de> writes:
> > 
> >> The answer is easy: if you use C, you can use ctypes to create a
> >> wrapper - with pure python, no compilation, no platform issues.
> > 
> > The last part is not true.  ctypes doesn't work on 64-bit
> > architectures, nor does it work when Python is built with non-gcc Unix
> > compilers
> 
>  ctypes works on 64bit systems, too. However it's a pain in the ... back
>  to write code with ctypes that works across all platforms. I used to use
>  ctypes for wrapper but eventually I switched to Cython.

What sort of problems have you had?

I find as long as I use the same types as the C code actually uses it
all works fine.  If on a 64 bit platform long is 64 bits then it will
be under ctypes too.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nagle at animats.com  Sun Feb 15 11:57:12 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 08:57:12 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.9565.1234708354.3487.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
Message-ID: <499841bf$0$1624$742ec2ed@news.sonic.net>

Benjamin Peterson wrote:
> Steve Holden <steve <at> holdenweb.com> writes:
>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>> to enable easier forward compatibility with the 3.X series ...
> 
> It's not an ugly hack. It just isn't all that you might hope it'd live up to be.

    The semantics aren't what the naive user would expect.  One would
expect an element of a bytearray to be a small integer.  But instead,
it has string-like behavior.  "+" means concatenate, not add.
The bit operators don't work at all.

Python 2.6.1 ...
 >>> a = b'A'
 >>> b = b'B'
 >>> a+b
'AB'
 >>> a[0]+b[0]
'AB'
 >>>>>> a = b'A'
 >>> b = b'B'
 >>> a+b
'AB'
 >>> a[0]+b[0]
'AB'
 >>>
 >>> a & b
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for &: 'str' and 'str'

    Given that the intent of bytearray is that it's a data type for
handling raw binary data of unknown format, one might expect it to behave like
"array.array('B')", which is an array of unsigned bytes that are
treated as integers.  But that's not how "bytearray" works.  "bytearray"
is more like the old meaning of "str", before Unicode support, circa Python 2.1.

    I sort of understand the mindset, but the documentation needs to be improved.
Right now, we have a few PEPs and the 2.6 "New features" article, but
no comprehensive documentation.  The relationship between "str", "unicode",
"bytearray", "array.array('B')", and integers, and how this changes from
version to version of Python, needs to be made clearer, or conversion
to 2.6/3.0 will not happen rapidly.

				John Nagle


From benjamin.kaplan at case.edu  Sun Feb 15 12:16:10 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 15 Feb 2009 12:16:10 -0500
Subject: "Byte" type?
In-Reply-To: <499841bf$0$1624$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
Message-ID: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>

On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:

> Benjamin Peterson wrote:
>
>> Steve Holden <steve <at> holdenweb.com> writes:
>>
>>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>>> to enable easier forward compatibility with the 3.X series ...
>>>
>>
>> It's not an ugly hack. It just isn't all that you might hope it'd live up
>> to be.
>>
>
>   The semantics aren't what the naive user would expect.  One would
> expect an element of a bytearray to be a small integer.  But instead,
> it has string-like behavior.  "+" means concatenate, not add.
> The bit operators don't work at all.
>

Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
a bytearray, it behaves like you expect.
>>> type(b'x')
<class 'bytes'>
>>> type(bytearray(b'x'))
<class 'bytearray'>
>>> ba = bytearray(b'abc')
>>> ba[0] + ba[1]
195



>
> Python 2.6.1 ...
> >>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>>>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>
> >>> a & b
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> TypeError: unsupported operand type(s) for &: 'str' and 'str'
>
>   Given that the intent of bytearray is that it's a data type for
> handling raw binary data of unknown format, one might expect it to behave
> like
> "array.array('B')", which is an array of unsigned bytes that are
> treated as integers.  But that's not how "bytearray" works.  "bytearray"
> is more like the old meaning of "str", before Unicode support, circa Python
> 2.1.
>
>   I sort of understand the mindset, but the documentation needs to be
> improved.
> Right now, we have a few PEPs and the 2.6 "New features" article, but
> no comprehensive documentation.  The relationship between "str", "unicode",
> "bytearray", "array.array('B')", and integers, and how this changes from
> version to version of Python, needs to be made clearer, or conversion
> to 2.6/3.0 will not happen rapidly.
>
>                                John Nagle
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pauljefferson at gmail.com  Sun Feb 15 12:31:23 2009
From: pauljefferson at gmail.com (Paul)
Date: Sun, 15 Feb 2009 09:31:23 -0800 (PST)
Subject: BaseHttpServer
Message-ID: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>

Hi,
I currently have a webserver using BaseHttpServe that serves images
like this:
if self.path.endswith(".jpg"):
                print(curdir + sep + self.path)
                f = open(curdir + sep + self.path,"b")
                self.send_response(200)
                self.send_header('Content-type',	'image/jpg')
                self.end_headers()
                self.wfile.write(f.read())
                f.close()
                return
Whilst it works, it does take quite a while to load (approx 10secs for
a 4mb file even though its over the local connection) - does anyone
have any hints/tips for speeding it up?
Thanks,
Paul


From fasteliteprogrammer at yahoo.com  Sun Feb 15 12:41:46 2009
From: fasteliteprogrammer at yahoo.com (Craig)
Date: Sun, 15 Feb 2009 09:41:46 -0800 (PST)
Subject: python in emacs
Message-ID: <107637.91428.qm@web36506.mail.mud.yahoo.com>

I would go to ubuntu linux if you can.

--- On Sun, 2/15/09, Diez B. Roggisch <deets at nospam.web.de> wrote:

From: Diez B. Roggisch <deets at nospam.web.de>
Subject: Re: python in emacs
To: python-list at python.org
Date: Sunday, February 15, 2009, 9:23 AM

kentandkat at sbcglobal.net schrieb:
> When I visit a file with extension .py, emacs says "loading
> python...done", and gives me a "python" menu with options like "start
> interpreter" and "eval buffer". When I try to use one of these options
> emacs says "loading compile...done", then hangs and has to be shut down
> from the task manager. The Python folder is in my PATH variable and
> works fine from the command line (or with IDLE). I'm using emacs-22.3 on
> windows xp, and have the same problem with both python-2.2 and
> python-3.0. Anybody got any tips, or should I just give up and use some
> other editor?

Did you try setting the python interpreter with the full path?

Diez
--
http://mail.python.org/mailman/listinfo/python-list



      
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From python at bdurham.com  Sun Feb 15 12:46:56 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 12:46:56 -0500
Subject: Pythonic way to determine if a string is a number
Message-ID: <1234720016.23422.1300488109@webmail.messagingengine.com>

What's the Pythonic way to determine if a string is a number? By
number I mean a valid integer or float.

I searched the string and cMath libraries for a similar function
without success. I can think of at least 3 or 4 ways to build my
own function.

Here's what I came up with as a proof-of-concept. Are there
'better' ways to perform this type of test?

Thanks,
Malcolm

<code>
def isnumber( input ):
    try:
        if '.' in input:
            num = float( input )
        else:
            num = int( input )
        return True

    except ValueError:
        return False

if __name__ == '__main__':
    tests = """
        12
        -12
        -12.34
        .0
        .
        1 2 3
        1 . 2
        just text
    """

    for test in tests.split( '\n' ):
        print 'test (%0s), isnumber: %1s' % \
          ( test.strip(), isnumber( test ) )

</code>


From lists at cheimes.de  Sun Feb 15 12:51:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 18:51:57 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <gn9knt$du2$1@ger.gmane.org>

python at bdurham.com schrieb:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
> 
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
> 
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
> 
> Thanks,
> Malcolm
> 
> <code>
> def isnumber( input ):
>     try:
>         if '.' in input:
>             num = float( input )
>         else:
>             num = int( input )
>         return True
> 
>     except ValueError:
>         return False

You code doesn't check for several float representations like "1e10",
"1E10", "inf" and "nan".

Christian



From pavanmishra at gmail.com  Sun Feb 15 12:54:31 2009
From: pavanmishra at gmail.com (Pavan Mishra)
Date: Sun, 15 Feb 2009 09:54:31 -0800 (PST)
Subject: PHP like documentation?
Message-ID: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>

I was wondering if I can use python documentation source
(reStructuredText) and restructure it along the lines of PHP
documentation. Allowing users to add comments, improving search etc.

I was thinking if it would be useful.


From metolone+gmane at gmail.com  Sun Feb 15 12:58:33 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sun, 15 Feb 2009 09:58:33 -0800
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	<gn9621$2hk$1@ger.gmane.org><mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
Message-ID: <gn9l46$fcn$1@ger.gmane.org>


"John Nagle" <nagle at animats.com> wrote in message 
news:499841bf$0$1624$742ec2ed at news.sonic.net...
> Benjamin Peterson wrote:
>> Steve Holden <steve <at> holdenweb.com> writes:
>>> Beware, also, that in 2.6 the "bytes" type is essentially an ugly hack
>>> to enable easier forward compatibility with the 3.X series ...
>>
>> It's not an ugly hack. It just isn't all that you might hope it'd live up 
>> to be.
>
>    The semantics aren't what the naive user would expect.  One would
> expect an element of a bytearray to be a small integer.  But instead,
> it has string-like behavior.  "+" means concatenate, not add.
> The bit operators don't work at all.
>
> Python 2.6.1 ...
> >>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>>>> a = b'A'
> >>> b = b'B'
> >>> a+b
> 'AB'
> >>> a[0]+b[0]
> 'AB'
> >>>
> >>> a & b
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: unsupported operand type(s) for &: 'str' and 'str'
>
>    Given that the intent of bytearray is that it's a data type for
> handling raw binary data of unknown format, one might expect it to behave 
> like
> "array.array('B')", which is an array of unsigned bytes that are
> treated as integers.  But that's not how "bytearray" works.  "bytearray"
> is more like the old meaning of "str", before Unicode support, circa 
> Python 2.1.

It *is* the old meaning of str.  It isn't a bytearray object in 2.6.X (and 
it isn't a bytearray object in 3.X either, but a bytes object):

Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> type(b'x')
<type 'str'>
>>> b'x'[0]
'x'

As Steve said, it is just an aliased type.  In 3.X it is really a bytes 
object:

Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit (Intel)] 
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> type(b'x')
<class 'bytes'>
>>> b'x'[0]
120

-Mark




From philip at semanchuk.com  Sun Feb 15 13:03:36 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 15 Feb 2009 13:03:36 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>


On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:

> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.


try:
    int(number)
    is_an_int = True
except:
    is_an_int = False

try:
    float(number)
    is_a_float = True
except:
    is_a_float = False

is_a_number = (is_an_int or is_a_float)




From nagle at animats.com  Sun Feb 15 13:09:09 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:09:09 -0800
Subject: "Byte" type?
In-Reply-To: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	
	<gn9621$2hk$1@ger.gmane.org>	
	<mailman.9565.1234708354.3487.python-list@python.org>	
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
Message-ID: <49985A45.7030507@animats.com>

Benjamin Kaplan wrote:
> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
> 
>> Benjamin Peterson wrote:

> Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
> a bytearray, it behaves like you expect.
>>>> type(b'x')
> <class 'bytes'>
>>>> type(bytearray(b'x'))
> <class 'bytearray'>
>>>> ba = bytearray(b'abc')
>>>> ba[0] + ba[1]
> 195

    That's indeed how Python 2.6 works.  But that's not how
PEP 3137 says it's supposed to work.

Guido:

  "I propose the following type names at the Python level:

         * bytes is an immutable array of bytes (PyString)
         * bytearray is a mutable array of bytes (PyBytes)"

...

"Indexing bytes and bytearray returns small ints (like the bytes type in
3.0a1, and like lists or array.array('B'))."
(Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
object with length 1.)

"b1 + b2: concatenation. With mixed bytes/bytearray operands, the return type is 
that of the first argument (this seems arbitrary until you consider how += works)."
(Not true in Python 2.6 - concatenation returns a bytearray in both cases.)

Is this a bug, a feature, a documentation error, or bad design?

				John Nagle


From roy at panix.com  Sun Feb 15 13:15:38 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 13:15:38 -0500
Subject: Pythonic way to determine if a string is a number
References: <mailman.9571.1234720024.3487.python-list@python.org>
Message-ID: <roy-315A91.13153815022009@news.panix.com>

In article <mailman.9571.1234720024.3487.python-list at python.org>,
 python at bdurham.com wrote:

> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.

try:
   int(myString)
except ValueError:
   print "That's bogus, man"


From lists at cheimes.de  Sun Feb 15 13:27:03 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 19:27:03 +0100
Subject: relocation R_X86_64_32 against `a local symbol' can not be used
	when    making a shared object; recompile with -fPIC
In-Reply-To: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>
References: <74d2b9c1-be68-4585-bb92-36815ca2b759@w35g2000yqm.googlegroups.com>
Message-ID: <gn9mpn$kp5$1@ger.gmane.org>

tkevans schrieb:
> Found a couple of references to this in the newsgroup, but no
> solutions.
> 
> I'm trying to build libsbml-3.3.0 with python 2.5.4 support on RHEL
> 5.3.  This RedHat distro has python 2.4.5, and libsbml builds ok with
> that release.
> 
> After building 2.5.4 (./configure CFLAGS=-fPIC , as the error message
> suggests), ld still croaks here:

How about compiling Python as a shared library? ./configure
--enable-shared does the trick.

Christian



From lists at cheimes.de  Sun Feb 15 13:27:47 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 19:27:47 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
Message-ID: <gn9mr3$kp5$2@ger.gmane.org>

Philip Semanchuk schrieb:
> 
> On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
> 
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
> 
> 
> try:
>    int(number)
>    is_an_int = True
> except:
>    is_an_int = False

Please don't teach new Python developers to use bare excepts. In fact
never use bare excepts at all!

Christian



From zubeido at yahoo.com.br  Sun Feb 15 13:33:15 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sun, 15 Feb 2009 10:33:15 -0800 (PST)
Subject: Rapidshare to Megaupload script
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<mailman.9548.1234649831.3487.python-list@python.org>
Message-ID: <a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>

Thanks a lot for your input i really needed because i realized these
are minor flaws but even so define whether its good or bad code and i
really need to improve that. I already implemented the changes you
suggested and this one,

>  cookie = dict(x.split("=") for x in cookie)

for me is just very good and really is elegant.
An aspect you didn't mention was the
>    urls.append("http://rapidshare.com/files/" + retrieved_data[0] + "/" + retrieved_data[1])
I think its very hackish and crude but urlparser doesnt seem to accept
more than one argument at a time and doing it in a loop seem worse
than the current solution. What would you do?
 Thanks a lot again


From zubeido at yahoo.com.br  Sun Feb 15 13:33:25 2009
From: zubeido at yahoo.com.br (aiwarrior)
Date: Sun, 15 Feb 2009 10:33:25 -0800 (PST)
Subject: Rapidshare to Megaupload script
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>
	<mailman.9548.1234649831.3487.python-list@python.org>
Message-ID: <896e9948-6dbc-4fb2-9ec2-74bb914166ab@33g2000yqm.googlegroups.com>

Thanks a lot for your input i really needed because i realized these
are minor flaws but even so define whether its good or bad code and i
really need to improve that. I already implemented the changes you
suggested and this one,

>  cookie = dict(x.split("=") for x in cookie)

for me is just very good and really is elegant.
An aspect you didn't mention was the
>    urls.append("http://rapidshare.com/files/" + retrieved_data[0] + "/" + retrieved_data[1])
I think its very hackish and crude but urlparser doesnt seem to accept
more than one argument at a time and doing it in a loop seem worse
than the current solution. What would you do?
 Thanks a lot again


From nagle at animats.com  Sun Feb 15 13:35:26 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:35:26 -0800
Subject: Can Python serial support run at 45.45 baud?
In-Reply-To: <49972cf5$0$1612$742ec2ed@news.sonic.net>
References: <4996e984$0$1657$742ec2ed@news.sonic.net>	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>	<49970561$0$1642$742ec2ed@news.sonic.net>	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
	<49972cf5$0$1612$742ec2ed@news.sonic.net>
Message-ID: <499858c5$0$1618$742ec2ed@news.sonic.net>

John Nagle wrote:
> MRAB wrote:
>> John Nagle wrote:
>> [snip]
>>> So the correct combination, 5 bits with 1.5 stop bits, isn't 
>>> supported in
>>> Python.  1 stop bit will not physically work on Baudot teletypes; the
>>> main camshaft doesn't come around fast enough.  (Yes, there's an actual
>>> mechanical reason for 1.5 stop bits.)  Requesting 2 stop bits at the
>>> Python level gets a reject at the Win32 level.  (Not sure why Win32
>>> doesn't allow that; extra stop bits just add delay, but don't hurt
>>> anything.  But it's not supported.)
> 
>    I patched PySerial to support "STOPBITS_ONE5", for 1.5 stop bits,
> and the big Teletype Model 15 is now banging out text from Python.

   Logged in as a PySerial bug, with discussion of fix:

[ 2603052 ] 5-bit mode not properly supported on Windows

   Linux support for nonstandard baud rates is possible, but needs a
call to "setserial", which is not standard POSIX.

				John Nagle


From nagle at animats.com  Sun Feb 15 13:40:11 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 15 Feb 2009 10:40:11 -0800
Subject: "Byte" type?
In-Reply-To: <ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>	
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>	
	<gn9621$2hk$1@ger.gmane.org>	
	<mailman.9565.1234708354.3487.python-list@python.org>	
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
Message-ID: <499859e2$0$1618$742ec2ed@news.sonic.net>

Benjamin Kaplan wrote:
> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
> 
>> Benjamin Peterson wrote:

> Because b'x' is NOT a bytearray. It is a bytes object. When you actually use
> a bytearray, it behaves like you expect.
>>>> type(b'x')
> <class 'bytes'>
>>>> type(bytearray(b'x'))
> <class 'bytearray'>
>>>> ba = bytearray(b'abc')
>>>> ba[0] + ba[1]
> 195

    That's indeed how Python 2.6 works.  But that's not how
PEP 3137 says it's supposed to work.

Guido:

  "I propose the following type names at the Python level:

         * bytes is an immutable array of bytes (PyString)
         * bytearray is a mutable array of bytes (PyBytes)"

...

"Indexing bytes and bytearray returns small ints (like the bytes type in
3.0a1, and like lists or array.array('B'))."
(Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
object with length 1.)

"b1 + b2: concatenation. With mixed bytes/bytearray operands, the return type is
that of the first argument (this seems arbitrary until you consider how += works)."
(Not true in Python 2.6 - concatenation returns a bytearray in both cases.)

Is this a bug, a feature, a documentation error, or bad design?

				John Nagle


From google at mrabarnett.plus.com  Sun Feb 15 13:56:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 18:56:53 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-315A91.13153815022009@news.panix.com>
References: <mailman.9571.1234720024.3487.python-list@python.org>
	<roy-315A91.13153815022009@news.panix.com>
Message-ID: <49986575.1040902@mrabarnett.plus.com>

Roy Smith wrote:
> In article <mailman.9571.1234720024.3487.python-list at python.org>,
>  python at bdurham.com wrote:
> 
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
> 
> try:
>    int(myString)
It could be a float, so:

     float(myString)

This will work even if it's an int.

> except ValueError:
>    print "That's bogus, man"
> 



From roy at panix.com  Sun Feb 15 14:01:12 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 14:01:12 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
Message-ID: <roy-24DB5B.14011215022009@news.panix.com>

In article <mailman.9577.1234722607.3487.python-list at python.org>,
 Christian Heimes <lists at cheimes.de> wrote:

> Philip Semanchuk schrieb:
> > 
> > On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
> > 
> >> What's the Pythonic way to determine if a string is a number? By
> >> number I mean a valid integer or float.
> > 
> > 
> > try:
> >    int(number)
> >    is_an_int = True
> > except:
> >    is_an_int = False
> 
> Please don't teach new Python developers to use bare excepts. In fact
> never use bare excepts at all!

I agree that the bare except is incorrect in this situation, but I don't 
agree that you should *never* use them.

They make sense when you need to recover from any error that may occur, 
possibly as the last resort after catching and dealing with more specific 
exceptions. In an unattended embedded system (think Mars Rover), the 
top-level code might well be:

while 1:
   try:
      main()
   except:
      reset()

or perhaps even (Range Safety Controller):

try:
   main()
except:
   self_destruct()


From google at mrabarnett.plus.com  Sun Feb 15 14:10:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 15 Feb 2009 19:10:42 +0000
Subject: Rapidshare to Megaupload script
In-Reply-To: <a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>
References: <d43584c9-e170-42ff-b23a-de999efe20df@p36g2000prp.googlegroups.com>	<mailman.9548.1234649831.3487.python-list@python.org>
	<a5e94f85-6a2f-4b36-93db-5db72a6bd53b@v42g2000yqj.googlegroups.com>
Message-ID: <499868B2.2040705@mrabarnett.plus.com>

aiwarrior wrote:
> Thanks a lot for your input i really needed because i realized these 
> are minor flaws but even so define whether its good or bad code and i
> really need to improve that. I already implemented the changes you 
> suggested and this one,
> 
>> cookie = dict(x.split("=") for x in cookie)
> 
> for me is just very good and really is elegant. An aspect you didn't
> mention was the
>> urls.append("http://rapidshare.com/files/" + retrieved_data[0] +
>> "/" + retrieved_data[1])
> I think its very hackish and crude but urlparser doesnt seem to
> accept more than one argument at a time and doing it in a loop seem
> worse than the current solution. What would you do?
> 
re.findall() returns a list of tuples, so retrieved_data is a tuple and
the following will work:

     urls.append("http://rapidshare.com/files/%s/%s" % retrieved_data)


From rushik.upadhyay at gmail.com  Sun Feb 15 14:56:55 2009
From: rushik.upadhyay at gmail.com (rushik)
Date: Sun, 15 Feb 2009 11:56:55 -0800 (PST)
Subject: Cannot able to retreive compressed html URL
Message-ID: <ed5d8df0-0cd6-4b17-92d0-d409f2bfdbe7@f3g2000vbf.googlegroups.com>

Hi,
I am trying to build python script which retreives and analyze the
various URLs and generate reports.

Some of the urls are like "http://xyz.com/test.html.gz", I am trying
to retreive it using urllib2 library and then using gzip library
trying to decompress it.

ex - server_url is say - http://xyz.com/test.html.gz

                logpage = urllib2.urlopen(server_url)
                html_content = cal_logpage.read()
                logpage.close()

                gz_tmp = open("gzip.txt.gz", "w")
                gz_tmp.write(html_content)
                gz_tmp.close()
                f = gzip.open("gzip.txt.gz", "rb")
                file_content = f.read()
                f.close()

                #return the resulting html content.
                return html_content

on executing the code, its giving

zlib.error - Error -3 while decompressing: invalid distance too far
back

the same URL I am able to retreive in proper html page format from
browser

please let me know if I am doing something wrong here, or is there any
other better way to do so.

Thanks,
R


From dotancohen at gmail.com  Sun Feb 15 15:03:25 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Sun, 15 Feb 2009 22:03:25 +0200
Subject: Python interface to ODF documents?
Message-ID: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>

Is there a Python interface to ODF documents? I'm thinking of
something that will import, for example, an ADS spreadsheet into a
multidimensional array (including formulas and formatting) and let me
manipulate it, then save it back.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From lists at cheimes.de  Sun Feb 15 15:04:49 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 15 Feb 2009 21:04:49 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-24DB5B.14011215022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
Message-ID: <gn9sh3$6jm$1@ger.gmane.org>

Roy Smith wrote:
> I agree that the bare except is incorrect in this situation, but I don't 
> agree that you should *never* use them.

A bare except should be used when followed by a raise

try:
   func()
except:
   log_error()
   raise

> They make sense when you need to recover from any error that may occur, 
> possibly as the last resort after catching and dealing with more specific 
> exceptions. In an unattended embedded system (think Mars Rover), the 
> top-level code might well be:
> 
> while 1:
>    try:
>       main()
>    except:
>       reset()

Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
and SyntaxError?

Christian



From python at bdurham.com  Sun Feb 15 15:05:01 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 15:05:01 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <gn9mr3$kp5$2@ger.gmane.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
Message-ID: <1234728301.16829.1300503743@webmail.messagingengine.com>

Thanks for everyone's feedback. I believe my original post's code
(updated following my signature) was in line with this list's feedback.

Christian: Thanks for reminding me about exponential formats. My updated
code accounts for these type of numbers. I don't need to handle inf or
nan values. My original code's except catches an explicit ValueError
exception per your concern about bare excepts.

Malcolm

<code>
# str_to_num.py

def isnumber( input ):
    try:
        num = float( input )
        return True

    except ValueError:
        return False

if __name__ == '__main__':
    tests = """
        12
        -12
        -12.34
        .0
        .
        1 2 3
        1 . 2

        1e10
        1E10
        inf
        nan

        12 and text
        just text
    """

    for test in tests.split( '\n' ):
        print 'test (%0s), isnumber: %1s' % ( test.strip(), isnumber(
        test ) )
</code>


From mail at timgolden.me.uk  Sun Feb 15 15:08:53 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sun, 15 Feb 2009 20:08:53 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234728301.16829.1300503743@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<gn9mr3$kp5$2@ger.gmane.org>
	<1234728301.16829.1300503743@webmail.messagingengine.com>
Message-ID: <49987655.7020605@timgolden.me.uk>

python at bdurham.com wrote:
> <code>
> # str_to_num.py
> 
> def isnumber( input ):
>     try:
>         num = float( input )
>         return True
> 
>     except ValueError:
>         return False


Just for the info, Malcolm, you don't actually
need to assign the result of float (input)
to anything if you don't need to use it. All
you're looking for is the exception. Let the
intepreter convert it and then throw it away.

Also, as an alternative style which can be more
appropriate depending on the structure and intention
of what you're doing, you can use the else: clause
of the try-except block.

try:
    float (input)
except ValueError:
    return False
else:
    return True

TJG


From tino at wildenhain.de  Sun Feb 15 15:10:30 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sun, 15 Feb 2009 21:10:30 +0100
Subject: Python interface to ODF documents?
In-Reply-To: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <499876B6.2070304@wildenhain.de>

Hi,

Dotan Cohen wrote:
> Is there a Python interface to ODF documents? I'm thinking of
> something that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.

Yes, you have zipfile and a host of xml parsers included in the
standard lib. This works very well to my experience.

Not sure if an abstraction layer on top of that exists.

Regards
Tino


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From mailinglists at vanwingerde.net  Sun Feb 15 15:24:22 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sun, 15 Feb 2009 21:24:22 +0100
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <499879F6.8060505@vanwingerde.net>

Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.
> I was thinking if it would be useful.

Very good idea!



-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net
web: http://jaap.vanwingerde.net/


From quentel.pierre at wanadoo.fr  Sun Feb 15 15:31:50 2009
From: quentel.pierre at wanadoo.fr (Pierre Quentel)
Date: Sun, 15 Feb 2009 12:31:50 -0800 (PST)
Subject: BaseHttpServer
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
Message-ID: <67131875-26c6-48b2-b337-104ed4fa633c@v38g2000yqb.googlegroups.com>

On 15 f?v, 18:31, Paul <pauljeffer... at gmail.com> wrote:
> Hi,
> I currently have a webserver using BaseHttpServe that serves images
> like this:
> if self.path.endswith(".jpg"):
> ? ? ? ? ? ? ? ? print(curdir + sep + self.path)
> ? ? ? ? ? ? ? ? f = open(curdir + sep + self.path,"b")
> ? ? ? ? ? ? ? ? self.send_response(200)
> ? ? ? ? ? ? ? ? self.send_header('Content-type', ? ? ? ?'image/jpg')
> ? ? ? ? ? ? ? ? self.end_headers()
> ? ? ? ? ? ? ? ? self.wfile.write(f.read())
> ? ? ? ? ? ? ? ? f.close()
> ? ? ? ? ? ? ? ? return
> Whilst it works, it does take quite a while to load (approx 10secs for
> a 4mb file even though its over the local connection) - does anyone
> have any hints/tips for speeding it up?
> Thanks,
> Paul

Hi,

This is probably because you first load the file content in memory by
f.read() before sending it. In this case it's better to send the
content by chunk, using shutil : replace

    self.wfile.write(f.read())
by :
    shutil.copyfileobj(f,self.wfile)

- Pierre


From hackingkk at gmail.com  Sun Feb 15 15:32:15 2009
From: hackingkk at gmail.com (Krishnakant)
Date: Mon, 16 Feb 2009 02:02:15 +0530
Subject: Python interface to ODF documents?
In-Reply-To: <499876B6.2070304@wildenhain.de>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
	<499876B6.2070304@wildenhain.de>
Message-ID: <1234729935.21750.0.camel@kk-laptop>

hello
look at python-ooolib
it can do what ever is needed and more.
happy hacking.
Krishnakant.
 
On Sun, 2009-02-15 at 21:10 +0100, Tino Wildenhain wrote:
> Hi,
> 
> Dotan Cohen wrote:
> > Is there a Python interface to ODF documents? I'm thinking of
> > something that will import, for example, an ADS spreadsheet into a
> > multidimensional array (including formulas and formatting) and let me
> > manipulate it, then save it back.
> 
> Yes, you have zipfile and a host of xml parsers included in the
> standard lib. This works very well to my experience.
> 
> Not sure if an abstraction layer on top of that exists.
> 
> Regards
> Tino
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From steve at holdenweb.com  Sun Feb 15 15:36:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 15:36:15 -0500
Subject: "Byte" type?
In-Reply-To: <499859e2$0$1618$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
Message-ID: <gn9uc4$c7h$1@ger.gmane.org>

John Nagle wrote:
> Benjamin Kaplan wrote:
>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>
>>> Benjamin Peterson wrote:
> 
>> Because b'x' is NOT a bytearray. It is a bytes object. When you
>> actually use
>> a bytearray, it behaves like you expect.
>>>>> type(b'x')
>> <class 'bytes'>
>>>>> type(bytearray(b'x'))
>> <class 'bytearray'>
>>>>> ba = bytearray(b'abc')
>>>>> ba[0] + ba[1]
>> 195
> 
>    That's indeed how Python 2.6 works.  But that's not how
> PEP 3137 says it's supposed to work.
> 
> Guido:
> 
>  "I propose the following type names at the Python level:
> 
>         * bytes is an immutable array of bytes (PyString)
>         * bytearray is a mutable array of bytes (PyBytes)"
> 
> ...
> 
> "Indexing bytes and bytearray returns small ints (like the bytes type in
> 3.0a1, and like lists or array.array('B'))."
> (Not true in Python 2.6 - indexing a "bytes" object returns a "bytes"
> object with length 1.)
> 
> "b1 + b2: concatenation. With mixed bytes/bytearray operands, the return
> type is
> that of the first argument (this seems arbitrary until you consider how
> += works)."
> (Not true in Python 2.6 - concatenation returns a bytearray in both cases.)
> 
> Is this a bug, a feature, a documentation error, or bad design?
> 
It's a feature. In fact all that was done to accommodate easier
migration to 3.x is easily shown in one statement:

>>> str is bytes
True
>>>

So that's why bytes works the way it does in 2.6 ... hence my contested
description of it as an "ugly hack". I am happy to withdraw "ugly", but
I think "hack" could still be held to apply.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From konteyaj at gmail.com  Sun Feb 15 15:38:17 2009
From: konteyaj at gmail.com (karan)
Date: Sun, 15 Feb 2009 12:38:17 -0800 (PST)
Subject: error while importing os
Message-ID: <fc16083e-b68a-448b-9007-7321e954ef7f@i18g2000prf.googlegroups.com>

Hi,

Iam new to python i see the following when iam in the python shell and
i try to import os,though i can import the sys and sys.path does
contain the path to the python binary or the folder where the python
binaries reside:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib\os.py",
line 683, in ?
    import copy_reg as _copy_reg
  File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib
\copy_reg.py", line 7, in ?
    from types import ClassType as _ClassType
ImportError: dynamic module does not define init function (inittypes)

I have the added the path to the Python which contain the python
binaries,DLLs to the PYTHONPATH.


Let me know what might be the reason for getting this error.

Thanks.


From python at bdurham.com  Sun Feb 15 15:40:47 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 15 Feb 2009 15:40:47 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <49987655.7020605@timgolden.me.uk>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<1234728301.16829.1300503743@webmail.messagingengine.com>
	<49987655.7020605@timgolden.me.uk>
Message-ID: <1234730447.23415.1300508497@webmail.messagingengine.com>

Tim,

> Just for the info, Malcolm, you don't actually need to assign the result of float (input) to anything if you don't need to use it. All you're looking for is the exception. Let the intepreter convert it and then throw it away.

Yes! 

> Also, as an alternative style which can be more appropriate depending on the structure and intention of what you're doing, you can use the else: clause of the try-except block.
>
> try:
>    float (input)
> except ValueError:
>    return False
> else:
>    return True

I follow the semantics, but I don't know why I would prefer the try/else
technique over the simpler:

try:
    float( input )
    return True
except ValueError:
    return False

Thank you for your feedback,

Malcolm


From steve at holdenweb.com  Sun Feb 15 15:46:01 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 15 Feb 2009 15:46:01 -0500
Subject: BaseHttpServer
In-Reply-To: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
Message-ID: <gn9uue$dtj$1@ger.gmane.org>

Paul wrote:
> Hi,
> I currently have a webserver using BaseHttpServe that serves images
> like this:
> if self.path.endswith(".jpg"):
>                 print(curdir + sep + self.path)
>                 f = open(curdir + sep + self.path,"b")
>                 self.send_response(200)
>                 self.send_header('Content-type',	'image/jpg')
>                 self.end_headers()
>                 self.wfile.write(f.read())
>                 f.close()
>                 return
> Whilst it works, it does take quite a while to load (approx 10secs for
> a 4mb file even though its over the local connection) - does anyone
> have any hints/tips for speeding it up?

You could consider reading the file in smaller blocks and writing the
output in a loop. That way the next block of the file can be read in
while the network buffers are emptying.

Just keep reading data and writing it until the number of data bytes you
wrote is fewer than the number you tried to read.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rushik.upadhyay at gmail.com  Sun Feb 15 16:17:53 2009
From: rushik.upadhyay at gmail.com (rushik)
Date: Sun, 15 Feb 2009 13:17:53 -0800 (PST)
Subject: Cannot able to retreive compressed html URL
References: <ed5d8df0-0cd6-4b17-92d0-d409f2bfdbe7@f3g2000vbf.googlegroups.com>
Message-ID: <322a11e8-47b8-4b8a-b9d8-5fbb61627538@q30g2000vbn.googlegroups.com>

On Feb 15, 11:56?am, rushik <rushik.upadh... at gmail.com> wrote:
> Hi,
> I am trying to build python script which retreives and analyze the
> various URLs and generate reports.
>
> Some of the urls are like "http://xyz.com/test.html.gz", I am trying
> to retreive it using urllib2 library and then using gzip library
> trying to decompress it.
>
> ex - server_url is say -http://xyz.com/test.html.gz
>
> ? ? ? ? ? ? ? ? logpage = urllib2.urlopen(server_url)
> ? ? ? ? ? ? ? ? html_content = cal_logpage.read()
> ? ? ? ? ? ? ? ? logpage.close()
>
> ? ? ? ? ? ? ? ? gz_tmp = open("gzip.txt.gz", "w")
> ? ? ? ? ? ? ? ? gz_tmp.write(html_content)
> ? ? ? ? ? ? ? ? gz_tmp.close()
> ? ? ? ? ? ? ? ? f = gzip.open("gzip.txt.gz", "rb")
> ? ? ? ? ? ? ? ? file_content = f.read()
> ? ? ? ? ? ? ? ? f.close()
>
> ? ? ? ? ? ? ? ? #return the resulting html content.
> ? ? ? ? ? ? ? ? return html_content
>
> on executing the code, its giving
>
> zlib.error - Error -3 while decompressing: invalid distance too far
> back
>
> the same URL I am able to retreive in proper html page format from
> browser
>
> please let me know if I am doing something wrong here, or is there any
> other better way to do so.
>
> Thanks,
> R

I got the solution !! using now urllib.retrieve

thx,
R


From jason.scheirer at gmail.com  Sun Feb 15 17:04:57 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Sun, 15 Feb 2009 14:04:57 -0800 (PST)
Subject: error while importing os
References: <fc16083e-b68a-448b-9007-7321e954ef7f@i18g2000prf.googlegroups.com>
Message-ID: <cbbfe910-49ce-4bd2-a4b9-1b52f3e6d784@g1g2000pra.googlegroups.com>

On Feb 15, 12:38?pm, karan <konte... at gmail.com> wrote:
> Hi,
>
> Iam new to python i see the following when iam in the python shell and
> i try to import os,though i can import the sys and sys.path does
> contain the path to the python binary or the folder where the python
> binaries reside:
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in ?
> ? File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib\os.py",
> line 683, in ?
> ? ? import copy_reg as _copy_reg
> ? File "C:\Perf\qa\test\build\vmqa\python\python-2.4.1-as\lib
> \copy_reg.py", line 7, in ?
> ? ? from types import ClassType as _ClassType
> ImportError: dynamic module does not define init function (inittypes)
>
> I have the added the path to the Python which contain the python
> binaries,DLLs to the PYTHONPATH.
>
> Let me know what might be the reason for getting this error.
>
> Thanks.

Looks like you have an errant dynamic library -- look for types.pyd on
your pythonpath and make sure the right one is getting imported.


From peter at www.pjb.com.au  Sun Feb 15 17:21:22 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 15 Feb 2009 22:21:22 GMT
Subject: Module to read/write MIDI ?
Message-ID: <slrngph5b2.2qd.peter@box8.pjb.com.au>

Greetings,

I speak as a newbie, in the sense that I've been programming Perl4&5
for fifteen years, but am checking out Python3 as an alternative to
Perl6.  So far I've translated one of my cpan modules into Python3
  http://www.pjb.com.au/comp/free/TermClui.py
  http://www.pjb.com.au/comp/free/test_script
and it basically works (the termios ioctls aren't quite what I want yet).

Another thing I'd need to proceed with Python3 is some equivalent
of Sean Burke's MIDI-Perl module:
  http://search.cpan.org/search?query=MIDI-Perl
  
I had my first look around pypi.python.org/pypi yesterday and didn't
see anything.  Is there a MIDI-module for Python ?  If not, I'll
email Sean to ask if he'd mind me translating his module into Python3...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From jcd at sdf.lonestar.org  Sun Feb 15 18:02:03 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sun, 15 Feb 2009 18:02:03 -0500
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <1234738923.721.4.camel@mctell>

On Sun, 2009-02-15 at 09:54 -0800, Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.
> 
> I was thinking if it would be useful.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

I think it would be useful to have somewhere, but I'm -1 on replacing
the official documentation with it.  I like having the official
documentation more... official.  I like that what you see there has been
fully vetted, edited, and tested.  If there's something wrong with it,
fix it.  If you've got a helpful tip, add it, but it shouldn't be as
easy as commenting to add to the official documentation.  You could
argue that the documentation itself is official, and the comments are
not, but I like not having to worry about what part of the page I'm
looking at.  I also like that google only indexes the official
documentation, and not the comments.  

As I said, it could be very helpful, and I'm not against people having a
place to share their advice, but I'd rather see it happen somewhere
besides python.org. 

Just my thought. 



From catphive at catphive.net  Sun Feb 15 18:07:06 2009
From: catphive at catphive.net (Brendan Miller)
Date: Sun, 15 Feb 2009 15:07:06 -0800
Subject: documentation link for python 3.0.1 on python.org is broken
Message-ID: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>

Like the title says.


From pauljefferson at gmail.com  Sun Feb 15 18:24:01 2009
From: pauljefferson at gmail.com (Paul)
Date: Sun, 15 Feb 2009 15:24:01 -0800 (PST)
Subject: BaseHttpServer
References: <718d890c-dfce-416d-934b-db0a47fc4678@b16g2000yqb.googlegroups.com>
	<mailman.9589.1234730781.3487.python-list@python.org>
Message-ID: <bd2ab14b-ca1a-4d7d-9ae5-aae7d5d4cefc@a12g2000yqm.googlegroups.com>

On Feb 15, 8:46?pm, Steve Holden <st... at holdenweb.com> wrote:
> Paul wrote:
> > Hi,
> > I currently have a webserver using BaseHttpServe that serves images
> > like this:
> > if self.path.endswith(".jpg"):
> > ? ? ? ? ? ? ? ? print(curdir + sep + self.path)
> > ? ? ? ? ? ? ? ? f = open(curdir + sep + self.path,"b")
> > ? ? ? ? ? ? ? ? self.send_response(200)
> > ? ? ? ? ? ? ? ? self.send_header('Content-type', ? 'image/jpg')
> > ? ? ? ? ? ? ? ? self.end_headers()
> > ? ? ? ? ? ? ? ? self.wfile.write(f.read())
> > ? ? ? ? ? ? ? ? f.close()
> > ? ? ? ? ? ? ? ? return
> > Whilst it works, it does take quite a while to load (approx 10secs for
> > a 4mb file even though its over the local connection) - does anyone
> > have any hints/tips for speeding it up?
>
> You could consider reading the file in smaller blocks and writing the
> output in a loop. That way the next block of the file can be read in
> while the network buffers are emptying.
>
> Just keep reading data and writing it until the number of data bytes you
> wrote is fewer than the number you tried to read.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Thanks for these but they seem to have made no difference - it still
loads (visually) in chunks on the screen taking quite a while.
Intrestingly, with the looping idea I got it to print out on each loop
and some took a substantial amount of time to load compared to others
(I tried using 1500 and then 10,000 size chunks,with the code being:
            if self.path.endswith(".jpg"):
                print(curdir + sep + self.path)
                f = open(curdir + sep + self.path,"rb")
                self.send_response(200)
                self.send_header('Content-type',	'image/jpg')
                self.end_headers()
                h = 10000
                while h==10000:
                    g = f.read(10000)
                    h = len(g)
                    print h
                    self.wfile.write(g)

                #self.wfile.write(f.read())

                #shutil.copyfileobj(f,self.wfile)
                f.close()
                return

I also tried loading it to memory before it was requested but that
also made no difference.
If anyone's got any suggestions, I would be very greatful,
Paul


From greg.ewing at canterbury.ac.nz  Sun Feb 15 18:33:42 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 16 Feb 2009 12:33:42 +1300
Subject: ANN: SuPy 1.4
Message-ID: <mailman.20.1234765727.11746.python-announce-list@python.org>

SuPy 1.4 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Changes in this version:

- Python tuples are converted to Ruby arrays, so you can pass them
   directly to Sketchup methods that require an array.

- 'Array' function for converting other Python sequences to arrays.

- X_AXIS, Y_AXIS, Z_AXIS constants.

- Unit conversion constants (feet, yard, etc.) e.g. 5 * feet


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From jaomatos at gmail.com  Sun Feb 15 18:36:21 2009
From: jaomatos at gmail.com (=?utf-8?q?Jos=C3=A9_Matos?=)
Date: Sun, 15 Feb 2009 23:36:21 +0000
Subject: Python is slow?
In-Reply-To: <gcbh0u$mj5$5@lust.ihug.co.nz>
References: <f905b3c6-c9da-4b7e-b698-f2a5d97e6dc6@c58g2000hsc.googlegroups.com>
	<mailman.1764.1222798473.3487.python-list@python.org>
	<gcbh0u$mj5$5@lust.ihug.co.nz>
Message-ID: <200902152336.22016.jaomatos@gmail.com>

On Monday 06 October 2008 00:01:50 Lawrence D'Oliveiro wrote:
> Not listed as one
> <http://www.fsf.org/licensing/licenses/index_html/view?searchterm=license>.

Look further
http://directory.fsf.org/project/gnuplot/

-- 
Jos? Ab?lio


From tjreedy at udel.edu  Sun Feb 15 18:39:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:39:38 -0500
Subject: PHP like documentation?
In-Reply-To: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
References: <0b0364a9-85a9-4fe1-822b-07c1d7eeacd1@p23g2000prp.googlegroups.com>
Message-ID: <gna93q$ae6$1@ger.gmane.org>

Pavan Mishra wrote:
> I was wondering if I can use python documentation source
> (reStructuredText) and restructure it along the lines of PHP
> documentation. Allowing users to add comments, improving search etc.

I presume the docs that are part of the distribution are covered by the 
rather liberal Python license, which is included with the doc set.



From tjreedy at udel.edu  Sun Feb 15 18:41:14 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:41:14 -0500
Subject: Python interface to ODF documents?
In-Reply-To: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <gna96o$ae6$2@ger.gmane.org>

Dotan Cohen wrote:
> Is there a Python interface to ODF documents? I'm thinking of
> something that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.

odf2py, probably among others.



From tjreedy at udel.edu  Sun Feb 15 18:43:36 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 15 Feb 2009 18:43:36 -0500
Subject: documentation link for python 3.0.1 on python.org is broken
In-Reply-To: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>
References: <ef38762f0902151507x4911457cw3cecb0aabc221a92@mail.gmail.com>
Message-ID: <gna9b6$ae6$3@ger.gmane.org>

Brendan Miller wrote:
> Like the title says.

but on which page?  in any case, inform webmaster at python.org of specific 
site problems



From mwilson at the-wire.com  Sun Feb 15 19:05:36 2009
From: mwilson at the-wire.com (Mel)
Date: Sun, 15 Feb 2009 19:05:36 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
Message-ID: <gnaak5$1nek$1@services.telesweet.net>

Christian Heimes wrote:
> Roy Smith wrote:

>> They make sense when you need to recover from any error that may occur,
>> possibly as the last resort after catching and dealing with more specific
>> exceptions. In an unattended embedded system (think Mars Rover), the
>> top-level code might well be:
>> 
>> while 1:
>>    try:
>>       main()
>>    except:
>>       reset()
> 
> Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> and SyntaxError?

Exactly.  A normal program should never do anything more comprehensive than

try:
    some_function ()
except StandardError:
    some_handling ()

IMHO

        Mel.



From Scott.Daniels at Acm.Org  Sun Feb 15 19:13:41 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sun, 15 Feb 2009 16:13:41 -0800
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <mailman.9581.1234728304.3487.python-list@python.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>

python at bdurham.com wrote:
> Thanks for everyone's feedback....
> def isnumber( input ):
>     try:
>         num = float( input )
>         return True
> 
>     except ValueError:
>         return False

Pretty good, but what about 0x23?

     def isnumber( input ):
         try:
             num = float(input)
             return True
         except ValueError:
             try:
                 num = int(input, 0) # Convert to int, base spec in arg
                 return True
             except ValueError:
                 return False


--Scott David Daniels
Scott.Daniels at Acm.Org


From sandraqu at silverica.com  Sun Feb 15 19:24:29 2009
From: sandraqu at silverica.com (Sandra Quiles)
Date: Sun, 15 Feb 2009 19:24:29 -0500
Subject: illegal list name
Message-ID: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>


Hello. I have followed the instructions of a post on Installing  
mailman on OS X 10.4, and got to step 7 and hit this error.

The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman  
2.1.5 (using this outdated version because I don't know how to upgrade  
Python despite going to the Python site.  It wasn't obvious to me  
which Linux package was an upgrade, and the installation of MacPython  
2.6.1 was not recognized by Terminal).

So. illegal name error. it list listname as 'mailman@<mycomputername>'

that's in response to the 'bin/newlist mailman' command

also, I purchased the Postfix Enabler, but have no clue what to do  
with the software.

Tips, advise, hand-holding welcomed.

-- sandra



From vincent at vincentdavis.net  Sun Feb 15 19:29:09 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sun, 15 Feb 2009 17:29:09 -0700
Subject: Above and beyond, A critique request
Message-ID: <77e831100902151629y286badf1t5af11adac45e5940@mail.gmail.com>

So I am new to python and not much of a programmer. Mostly program using
statistical packages. I been working on a project to simulate the
medical residency match for about 2 weeks. I don't know any python
programmers so I would greatly appreciate any comment or suggestions you may
have to improve my programing skills. My program does work but I have no
comparison or experience to know if I have used "best practices". Suggestion
may be broad or specific all input is appreciated. I have
already benefited from the group and am appreciative of it.

Due to python-list at python.org limited post size I have only included the
final step. If someone is willing to review my complete program ~250 lines
it can be downloaded at http://vincentdavis.org/match

In word this is what it does.


   - Creates a population of institutions and applicants, quality and score
   are generated for each by drawing from a random dist.
   - The is an observation error, that is the institutions do not see the
   true applicant score and the applicant do not see the true institution
   quality.
   - applicants apply to institution that are near there ability
   - institutions reject if applicant is not qualified
   - applicant rank the institutions 0 best large values worse
   - institutions rank applicants
   - The Match is best described here
   http://www.nrmp.org/res_match/about_res/algorithms.html


I have a lot of print functions mostly to track what was going on during
development.

Thanks
Vincent Davis
720-301-3003

# NumApp  is the number of applicants
# NumInst  is the number of institutions
# ari  is a list of institutions rank by each applicant, [[5, 6, 2], [8, 3,
6, 2], [.........  So applicant 1 ranked institution 2 first and institution
6 second, applicant 2 ranked institution 6 third
# ira  institutions ranking of applicants same format as ari but from the
institutions perspective
# iram  is a "matrix" version of ira, rows are applicants, colums are
institutions values represent the rank, that is the rank the institution
gave the applicant
# I think that is all that is used in this part that is not defined below.


#### Starts here ####
app_match = [None]*NumApp # the list of institution each applicant is
matched to
try_list = [] # makes a copy of ari
try_list.extend(ari) # makes a copy of ari
inst_match=[[] for x in range(NumInst)] # this is a list of applicants each
Institution accepted

#get list of applicants not matched

notmatched = [x for x in range(NumApp) if (app_match[x] == None and
len(try_list[x]) > 0)]

print 'notmatched', notmatched
print 'len(notmatched)', len(notmatched)
while len(notmatched) > 0:
    for x in notmatched:
        try_inst = try_list[x][0] # try this institution
        try_rank = ari[x].index(try_inst) # try_inst is ranked --
        app_ranked = iram[x][try_inst] # this is what try_inst ranked the
applicant
        print 'Try to match Applicant', x, ' to rank', try_rank, 'at inst',
try_inst
        print 'Who is in inst', try_inst, inst_match[try_inst]
        print 'Institution', try_inst, 'ranked applicant', x, app_ranked

        ranklist = [iram[i][try_inst] for i in inst_match[try_inst]] # this
is the rank of each applicant matched to try_inst

        if len(ranklist) > 0:
            max_rank = max(ranklist) # the max rank value "lowest rank"
            max_app = inst_match[try_inst][ranklist.index(max_rank)] # the
applicant corresponding to max_rank

        if len(inst_match[try_inst]) < NumAccept : #Does the institution
have an empty spot.
            print 'Institution', try_inst, 'has an empty spot for', x
            inst_match[try_inst].append(x) # Add to institutions list
            print x, 'in now in', try_inst, 'with', inst_match[try_inst]
            app_match[x] = try_inst # assign inst to app
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) == NumAccept and app_ranked <
max_rank) :
            print 'Applicant',x , 'is ranked', app_ranked, 'which is higher
than', max_app, 'who was ranked', max_rank
            print 'so applicant', x, 'bumps', max_app

            app_match[max_app] = None
            inst_match[try_inst].remove(max_app)

            app_match[x] = try_inst
            inst_match[try_inst].append(x)
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) == NumAccept and iram[x][try_inst] >
max_rank) :
            print 'Applicant',x , 'is ranked', app_ranked, 'which is Lower
than', max_app, 'who was ranked', max_rank
            print 'therefor', x, 'does not match at', try_inst
            try_list[x].remove(try_inst) # remove the institution so it is
not tried later

        elif (len(inst_match[try_inst]) > NumAccept) :
            print '#################### to many matched to institution, fix
this, some thing is broke ###################'

        else:
            print '#################### fix this, some thing is broke
###################'

    print 'finished with applicant', x

    notmatched = [x for x in range(NumApp) if (app_match[x] == None and
len(try_list[x]) > 0)]
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From vincent at vincentdavis.net  Sun Feb 15 19:39:06 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Sun, 15 Feb 2009 17:39:06 -0700
Subject: illegal list name
In-Reply-To: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>
References: <23C4EB98-C660-4C24-8C98-05BE7E7BDE41@silverica.com>
Message-ID: <77e831100902151639l4c4d3a1fu3f5f40cadff539ed@mail.gmail.com>

You probably have got 2.6 installed you just need to tell terminal to use
2.6, there should be a shell command inside the 2.6 folder that updates the
terminal to use 2.6 otherwise you start python by referring directly to the
"python" you need to use. Sorry I have no advise on mailman.

Thanks
Vincent Davis



On Sun, Feb 15, 2009 at 5:24 PM, Sandra Quiles <sandraqu at silverica.com>wrote:

>
> Hello. I have followed the instructions of a post on Installing mailman on
> OS X 10.4, and got to step 7 and hit this error.
>
> The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman
> 2.1.5 (using this outdated version because I don't know how to upgrade
> Python despite going to the Python site.  It wasn't obvious to me which
> Linux package was an upgrade, and the installation of MacPython 2.6.1 was
> not recognized by Terminal).
>
> So. illegal name error. it list listname as 'mailman@<mycomputername>'
>
> that's in response to the 'bin/newlist mailman' command
>
> also, I purchased the Postfix Enabler, but have no clue what to do with the
> software.
>
> Tips, advise, hand-holding welcomed.
>
> -- sandra
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From philip at semanchuk.com  Sun Feb 15 20:35:17 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 15 Feb 2009 20:35:17 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <gn9mr3$kp5$2@ger.gmane.org>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
Message-ID: <F0659E07-B521-433B-8A54-C98A677F8CBD@semanchuk.com>


On Feb 15, 2009, at 1:27 PM, Christian Heimes wrote:

> Philip Semanchuk schrieb:
>>
>> On Feb 15, 2009, at 12:46 PM, python at bdurham.com wrote:
>>
>>> What's the Pythonic way to determine if a string is a number? By
>>> number I mean a valid integer or float.
>>
>>
>> try:
>>   int(number)
>>   is_an_int = True
>> except:
>>   is_an_int = False
>
> Please don't teach new Python developers to use bare excepts.

Good point; my example is lazy.

I should know better as I myself got burned on bare excepts a few  
times when I started with Python. 


From sjmachin at lexicon.net  Sun Feb 15 20:37:19 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 15 Feb 2009 17:37:19 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org> 
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>

On Feb 16, 7:05?am, pyt... at bdurham.com wrote:
> Thanks for everyone's feedback. I believe my original post's code
> (updated following my signature) was in line with this list's feedback.
>
> Christian: Thanks for reminding me about exponential formats. My updated
> code accounts for these type of numbers. I don't need to handle inf or
> nan values. My original code's except catches an explicit ValueError
> exception per your concern about bare excepts.
>
> Malcolm
>
> <code>
> # str_to_num.py
>
> def isnumber( input ):
> ? ? try:
> ? ? ? ? num = float( input )
> ? ? ? ? return True
>
> ? ? except ValueError:
> ? ? ? ? return False
>
> if __name__ == '__main__':
> ? ? tests = """
> ? ? ? ? 12
> ? ? ? ? -12
> ? ? ? ? -12.34
> ? ? ? ? .0
> ? ? ? ? .
> ? ? ? ? 1 2 3
> ? ? ? ? 1 . 2
>
> ? ? ? ? 1e10
> ? ? ? ? 1E10
> ? ? ? ? inf
> ? ? ? ? nan
>
> ? ? ? ? 12 and text
> ? ? ? ? just text
> ? ? """
>
> ? ? for test in tests.split( '\n' ):
> ? ? ? ? print 'test (%0s), isnumber: %1s' % ( test.strip(), isnumber(
> ? ? ? ? test ) )
> </code>

Do you care about numbers that are representable as an int, but are
treated as inf by float()?

For example:
| >>> s = '1' * 310
| >>> float(s)
| inf
| >>> a = int(s)
| >>> # OK


From roy at panix.com  Sun Feb 15 21:35:20 2009
From: roy at panix.com (Roy Smith)
Date: Sun, 15 Feb 2009 21:35:20 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
Message-ID: <roy-7680F2.21352015022009@news.panix.com>

In article <gnaak5$1nek$1 at services.telesweet.net>,
 Mel <mwilson at the-wire.com> wrote:

> Christian Heimes wrote:
> > Roy Smith wrote:
> 
> >> They make sense when you need to recover from any error that may occur,
> >> possibly as the last resort after catching and dealing with more specific
> >> exceptions. In an unattended embedded system (think Mars Rover), the
> >> top-level code might well be:
> >> 
> >> while 1:
> >>    try:
> >>       main()
> >>    except:
> >>       reset()
> > 
> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> > and SyntaxError?

Absolutely.  Let's take my example -- you're writing software for a Mars 
Rover.  I have no idea how you might get a MemoryError, but let's say you 
do.  Which would you rather do, perform a system reset, or print a stack 
trace and wait for a friendly Martian to come along and reboot you?

You may think I'm being silly, but I'm dead serious.  The many layers of 
"It's impossible for this to happen, but if it does let's do something to 
try and recover" processing saved that mission several times over.  In some 
applications, there's no such thing as "halt".


From basu at archlinux.us  Sun Feb 15 21:36:44 2009
From: basu at archlinux.us (member Basu)
Date: Sun, 15 Feb 2009 21:36:44 -0500
Subject: Display a list using PyQt
Message-ID: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>

I'm writing an application with PyQt as the GUI toolkit. I have a function
that returns a simple list and I would like to update a List View widget
with it. However I can't get it to work. I'm not sure if I need to subclass
one of the Model classes, because it is just a list. Can someone point me to
a simple tutorial or give me instructions on how to go about doing this?
Thanks,
Basu
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From bedouglas at earthlink.net  Sun Feb 15 21:58:49 2009
From: bedouglas at earthlink.net (bruce)
Date: Sun, 15 Feb 2009 18:58:49 -0800
Subject: testing xml against xpather with firefox
Message-ID: <41de01c98fe2$8e8bb070$0301a8c0@tmesa.com>

hi...

got a short test against a website, and i'm using xpath (libxml2dom) in
order to extract the data. in order to create the xpath function/query, i
display the page in firefox, and use DOM/Xpather to get the xpath. i'm then
attempting to implement the xpath in my test python script.

my issue is that the xpath that appears to work in the XPather app, doesn't
give me the same results in my test python script.

my test app is below. it iterates through the list of rows in the tbl, and
for each row, it's supposed to count (and then process) the number of the
direct child "td" elements for the "tr". the xpath in XPather does this as
expected. my test app doesn't...

i can include the actual content from the page if needed. i'm including the
test script, and the output of the test...

any thoughts would be greatly appreciated...

the XPather function works as expected.

i've posted all the code/output/XPather xpath to pastebin to save space.. i
can send everything i have to whoever can help!!

http://pastebin.com/m26acf804


thanks!

-bruce



From nad at acm.org  Sun Feb 15 22:15:17 2009
From: nad at acm.org (Ned Deily)
Date: Sun, 15 Feb 2009 19:15:17 -0800
Subject: RELEASED Python 3.0.1
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
Message-ID: <nad-2D157E.19151715022009@news.gmane.org>

In article 
<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe at mail.gmail.com>,
 Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
> Any chance of getting a Mac installer for this one?

BTW, I see the a link to the OS X installer has now been added to the 
3.0.1 release page:
   <http://www.python.org/download/releases/3.0.1/>

It would be great if someone could add OS X links for the 3.0.1 and 
2.6.1 to the main download page, too:
   <http://www.python.org/download/>

-- 
 Ned Deily,
 nad at acm.org



From grante at visi.com  Sun Feb 15 23:49:31 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 15 Feb 2009 22:49:31 -0600
Subject: Can Python serial support run at 45.45 baud?
References: <4996e984$0$1657$742ec2ed@news.sonic.net>
	<-rednU9RmNnrbwvUnZ2dnUVZ_sHinZ2d@posted.usinternet>
	<49970561$0$1642$742ec2ed@news.sonic.net>
	<49970ce7$0$1665$742ec2ed@news.sonic.net>
	<mailman.9543.1234637591.3487.python-list@python.org>
	<49972cf5$0$1612$742ec2ed@news.sonic.net>
	<499858c5$0$1618$742ec2ed@news.sonic.net>
Message-ID: <PrCdndkfF73GbQXUnZ2dnUVZ_rvinZ2d@posted.usinternet>

On 2009-02-15, John Nagle <nagle at animats.com> wrote:

> Linux support for nonstandard baud rates is possible, but
> needs a call to "setserial",

Or use of a non-POSIX ioctl() call.

> which is not standard POSIX.

True -- there is no way to do non-standard baud rates using
just POSIX calls.

-- 
Grant



From python at bdurham.com  Mon Feb 16 00:17:37 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:17:37 -0500
Subject: Pythonic way to determine if one char of many in a string
Message-ID: <1234761457.20683.1300568627@webmail.messagingengine.com>

I need to test strings to determine if one of a list of chars is
in the string. A simple example would be to test strings to
determine if they have a vowel (aeiouAEIOU) present.
I was hopeful that there was a built-in method that operated
similar to startswith where I could pass a tuple of chars to be
tested, but I could not find such a method.
Which of the following techniques is most Pythonic or are there
better ways to perform this type of match?
# long and hard coded but short circuits as soon as match found
if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
... :
-OR-
# flexible, but no short circuit on first match
if [ char for char in word if char in 'aeiouAEIOU' ]:
-OR-
# flexible, but no short circuit on first match
if set( word ).intersection( 'aeiouAEIOU' ):
Thank you,
Malcolm
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From python at bdurham.com  Mon Feb 16 00:28:39 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:28:39 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
	<5--dnbQlAdqsMgXUnZ2dnUVZ_tmWnZ2d@pdx.net>
Message-ID: <1234762119.22230.1300571397@webmail.messagingengine.com>

Scott,

> Pretty good, but what about 0x23?
> 
<snipped>
> num = int(input, 0) # Convert to int, base spec in arg
>

Very nice! I wasn't familiar with the use of 0 as a radix value. A quick
visit back to the documentation and I'm an enlightened man :)

Thanks for your feedback,

Malcolm


From Nicolas.Dandrimont at crans.org  Mon Feb 16 00:28:46 2009
From: Nicolas.Dandrimont at crans.org (Nicolas Dandrimont)
Date: Mon, 16 Feb 2009 00:28:46 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234761457.20683.1300568627@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
Message-ID: <20090216052846.GA12723@dirichlet.crans.org>

* python at bdurham.com <python at bdurham.com> [2009-02-16 00:17:37 -0500]:

> I need to test strings to determine if one of a list of chars is
> in the string. A simple example would be to test strings to
> determine if they have a vowel (aeiouAEIOU) present.
> I was hopeful that there was a built-in method that operated
> similar to startswith where I could pass a tuple of chars to be
> tested, but I could not find such a method.
> Which of the following techniques is most Pythonic or are there
> better ways to perform this type of match?
> # long and hard coded but short circuits as soon as match found
> if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
> ... :
> -OR-
> # flexible, but no short circuit on first match
> if [ char for char in word if char in 'aeiouAEIOU' ]:
> -OR-
> # flexible, but no short circuit on first match
> if set( word ).intersection( 'aeiouAEIOU' ):

I would go for something like:

for char in word:
    if char in 'aeiouAEIUO':
        char_found = True
        break
else:
    char_found = False

(No, I did not forget to indent the else statement, see
http://docs.python.org/reference/compound_stmts.html#for)

It is clear (imo), and it is seems to be the intended idiom for a search
loop, that short-circuits as soon as a match is found.

Cheers,
-- 
Nicolas Dandrimont

linux: the choice of a GNU generation
(ksh at cis.ufl.edu put this on Tshirts in '93)
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From python at bdurham.com  Mon Feb 16 00:37:22 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:37:22 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
	<6bdfeec3-b1f8-46d0-aeb3-d35b243f01b9@z6g2000pre.googlegroups.com>
Message-ID: <1234762642.23958.1300571929@webmail.messagingengine.com>

John,

> Do you care about numbers that are representable as an int, but are treated as inf by float()?
> 
> For example:
> | >>> s = '1' * 310
> | >>> float(s)
> | inf
> | >>> a = int(s)
> | >>> # OK

My code range checks all numbers once they've been parsed, so I don't
believe this will be a problem for me.

However, I appreciate you pointing out this behavior because I was
unaware of this subtle nuance. I'll make sure to add this to our code
review checklist.

Thanks for your feedback,

Malcolm


From python at bdurham.com  Mon Feb 16 00:48:34 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 16 Feb 2009 00:48:34 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <20090216052846.GA12723@dirichlet.crans.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
Message-ID: <1234763314.25586.1300573535@webmail.messagingengine.com>

Nicolas,

> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
>
> It is clear (imo), and it is seems to be the intended idiom for a 
> search loop, that short-circuits as soon as a match is found.

Thank you - that looks much better that my overly complicated attempts.

Are there any reasons why I couldn't simplify your approach as follows?

for char in word:
    if char in 'aeiouAEIUO':
        return True
return False

Cheers,
Malcolm


From clp2 at rebertia.com  Mon Feb 16 00:56:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 15 Feb 2009 21:56:00 -0800
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234761457.20683.1300568627@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
Message-ID: <50697b2c0902152156n6ef16a8ao36a71e362120308f@mail.gmail.com>

On Sun, Feb 15, 2009 at 9:17 PM,  <python at bdurham.com> wrote:
> I need to test strings to determine if one of a list of chars is in the
> string. A simple example would be to test strings to determine if they have
> a vowel (aeiouAEIOU) present.
>
> I was hopeful that there was a built-in method that operated similar to
> startswith where I could pass a tuple of chars to be tested, but I could not
> find such a method.
>
> Which of the following techniques is most Pythonic or are there better ways
> to perform this type of match?
>
> # long and hard coded but short circuits as soon as match found
> if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> -OR-
>
> # flexible, but no short circuit on first match
> if [ char for char in word if char in 'aeiouAEIOU' ]:

Just use the fairly new builtin function any() to make it short-circuit:

if any(char.lower() in 'aeiou' for char in word):
    do_whatever()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From michele.simionato at gmail.com  Mon Feb 16 01:12:32 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sun, 15 Feb 2009 22:12:32 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>
Message-ID: <1cfad349-033c-49a0-b9ad-213814638567@t13g2000yqc.googlegroups.com>

On Feb 14, 3:27?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> I should probably raise a clearer error message.

Ok, I have uploaded version 3.0.1 of the decorator module,
which raises a more meaningful message in case you try to
decorate a method incorrectly. I have also added a
discussion of that case in the "caveats" session.
HTH,

                   M. Simionato


From laplacian42 at gmail.com  Mon Feb 16 01:25:39 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Sun, 15 Feb 2009 22:25:39 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
Message-ID: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>

I think I just found the GUI toolkit for Python I've been searching
for. It seems to meet all of the following requirements:

  * free software
  * small (I don't need batteries -- Python already comes with those.)
  * easy to use
  * actively maintained
  * cross-platform
  * easy to install
  * based on a stable and actively-maintained C library
  * does not depend on an external scripting language (for example,
Tcl)
  * well-documented
  * not too many dependencies
  * can easily integrate with PyOpenGL
  * support for accessibility

and it's also written in Python.

I have no idea how it's stayed under the radar in the Python community
for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
gui.html). The C library it depends upon? [SDL](http://
www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).

The sf project page is <http://sourceforge.net/projects/ocemp/>.

Installation only requires getting SDL installed, then PyGame, and
then a `sudo python setup.py install` for OcempGUI. `cd` into its `doc/
examples` directory and run a few of the examples (ex. `python
hello_world.py`).

The part of [the manual](http://ocemp.sourceforge.net/manual/ocempgui-
manual.html) that seems most like a beginner tutorial is <http://
ocemp.sourceforge.net/manual/gui_applications.html>.


From matzke at berkeley.edu  Mon Feb 16 01:44:11 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Sun, 15 Feb 2009 22:44:11 -0800
Subject: hist without plotting
Message-ID: <49990B3B.5070002@berkeley.edu>

Hi,

Is there a way to run the numpy hist function or something similar and 
get the outputs (bins, bar heights) without actually producing the plot 
on the screen?

(R has a plot = false option, something like this is what I'm looking 
for...)

Cheers!
Nick


-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From tino at wildenhain.de  Mon Feb 16 02:01:39 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:01:39 +0100
Subject: hist without plotting
In-Reply-To: <49990B3B.5070002@berkeley.edu>
References: <49990B3B.5070002@berkeley.edu>
Message-ID: <49990F53.80709@wildenhain.de>

Nick Matzke wrote:
> Hi,
> 
> Is there a way to run the numpy hist function or something similar and 
> get the outputs (bins, bar heights) without actually producing the plot 
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking 
> for...)

something like scipy.histogram(a) ?

Actually I don't see many plotting functions beside plot()
anyway...

Regards
Tino
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From timr at probo.com  Mon Feb 16 02:04:38 2009
From: timr at probo.com (Tim Roberts)
Date: Sun, 15 Feb 2009 23:04:38 -0800
Subject: illegal list name
References: <mailman.6.1234743905.11746.python-list@python.org>
Message-ID: <bq3ip4la2br76i9osmhorh9af7njesuang@4ax.com>

Sandra Quiles <sandraqu at silverica.com> wrote:
>
>Hello. I have followed the instructions of a post on Installing  
>mailman on OS X 10.4, and got to step 7 and hit this error.
>
>The hard- and software involved is: OS X 10.4.x, Python 2.3.5, Mailman  
>2.1.5 (using this outdated version because I don't know how to upgrade  
>Python despite going to the Python site.  It wasn't obvious to me  
>which Linux package was an upgrade, and the installation of MacPython  
>2.6.1 was not recognized by Terminal).
>
>So. illegal name error. it list listname as 'mailman@<mycomputername>'
>
>that's in response to the 'bin/newlist mailman' command

Did you read ANY of the documentation?  Such as, for example, the part
where it tells you that Mailman creates a special, hidden mailing list
called "mailman"?

In any case, the name of a mailing list should have some tenuous
relationship to exactly what the list is for.  Your name has no such
relationship.

>also, I purchased the Postfix Enabler, but have no clue what to do  
>with the software.
>
>Tips, advise, hand-holding welcomed.

I'm sorry to be crude, but if you expect to be in the habit of purchasing
software when you have no clue what to do with it, my best advice is that
you should stop purchasing software.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From pythonnutter at gmail.com  Mon Feb 16 02:04:54 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:04:54 +1100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <1234720016.23422.1300488109@webmail.messagingengine.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
Message-ID: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>

Type casting seems to be the wrong way to go about this.

teststring = '15719'
teststring.isdigit()
returns True

That takes care of integers.

from string import digits
digits
'0123456789'

now you have all the digits and you can do set testing in your logic
to see if the teststring has anything in digits

A dumb way to test is alphanumeric

teststring2 = '105.22'
teststring2.isalnum()
returns True

now you can go on from there and test to further to eliminate
'abcd385laf8' which on alnum() also returns true.

Have fun,
Cheers,
PN


2009/2/16  <python at bdurham.com>:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
>
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
>
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
>
> Thanks,
> Malcolm
>
> <code>
> def isnumber( input ):
>    try:
>        if '.' in input:
>            num = float( input )
>        else:
>            num = int( input )
>        return True
>
>    except ValueError:
>        return False
>
> if __name__ == '__main__':
>    tests = """
>        12
>        -12
>        -12.34
>        .0
>        .
>        1 2 3
>        1 . 2
>        just text
>    """
>
>    for test in tests.split( '\n' ):
>        print 'test (%0s), isnumber: %1s' % \
>          ( test.strip(), isnumber( test ) )
>
> </code>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From pythonnutter at gmail.com  Mon Feb 16 02:09:00 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:09:00 +1100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
Message-ID: <af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>

silly me, forgot to mention

build a set from digits + '.' and use that for testing.

Cheers,
PN


2009/2/16 Python Nutter <pythonnutter at gmail.com>:
> Type casting seems to be the wrong way to go about this.
>
> teststring = '15719'
> teststring.isdigit()
> returns True
>
> That takes care of integers.
>
> from string import digits
> digits
> '0123456789'
>
> now you have all the digits and you can do set testing in your logic
> to see if the teststring has anything in digits
>
> A dumb way to test is alphanumeric
>
> teststring2 = '105.22'
> teststring2.isalnum()
> returns True
>
> now you can go on from there and test to further to eliminate
> 'abcd385laf8' which on alnum() also returns true.
>
> Have fun,
> Cheers,
> PN
>
>
> 2009/2/16  <python at bdurham.com>:
>> What's the Pythonic way to determine if a string is a number? By
>> number I mean a valid integer or float.
>>
>> I searched the string and cMath libraries for a similar function
>> without success. I can think of at least 3 or 4 ways to build my
>> own function.
>>
>> Here's what I came up with as a proof-of-concept. Are there
>> 'better' ways to perform this type of test?
>>
>> Thanks,
>> Malcolm
>>
>> <code>
>> def isnumber( input ):
>>    try:
>>        if '.' in input:
>>            num = float( input )
>>        else:
>>            num = int( input )
>>        return True
>>
>>    except ValueError:
>>        return False
>>
>> if __name__ == '__main__':
>>    tests = """
>>        12
>>        -12
>>        -12.34
>>        .0
>>        .
>>        1 2 3
>>        1 . 2
>>        just text
>>    """
>>
>>    for test in tests.split( '\n' ):
>>        print 'test (%0s), isnumber: %1s' % \
>>          ( test.strip(), isnumber( test ) )
>>
>> </code>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>


From tino at wildenhain.de  Mon Feb 16 02:14:33 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:14:33 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
Message-ID: <49991259.60305@wildenhain.de>

Python Nutter wrote:
> Type casting seems to be the wrong way to go about this.
> 
> teststring = '15719'
> teststring.isdigit()
> returns True

Actually its instantiating not type casting and it works
by using the type's actual description of the data it
accepts. This looks pretty good approach instead of trying
to copy (incomplete as it has been shown not only digits and
. constitute a float) already implemented code.

Of course if you want to limit the range of accepted data
even more, then isdigit and friends can be used -
maybe you could time both approaches with a set of data.

Regards
Tino
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From tino at wildenhain.de  Mon Feb 16 02:18:42 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Mon, 16 Feb 2009 08:18:42 +0100
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-7680F2.21352015022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>	<mailman.9577.1234722607.3487.python-list@python.org>	<roy-24DB5B.14011215022009@news.panix.com>	<mailman.9582.1234728315.3487.python-list@python.org>	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
Message-ID: <49991352.1050801@wildenhain.de>

Roy Smith wrote:
> In article <gnaak5$1nek$1 at services.telesweet.net>,
>  Mel <mwilson at the-wire.com> wrote:
> 
>> Christian Heimes wrote:
>>> Roy Smith wrote:
>>>> They make sense when you need to recover from any error that may occur,
>>>> possibly as the last resort after catching and dealing with more specific
>>>> exceptions. In an unattended embedded system (think Mars Rover), the
>>>> top-level code might well be:
>>>>
>>>> while 1:
>>>>    try:
>>>>       main()
>>>>    except:
>>>>       reset()
>>> Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
>>> and SyntaxError?
> 
> Absolutely.  Let's take my example -- you're writing software for a Mars 
> Rover.  I have no idea how you might get a MemoryError, but let's say you 
> do.  Which would you rather do, perform a system reset, or print a stack 
> trace and wait for a friendly Martian to come along and reboot you?
> 
> You may think I'm being silly, but I'm dead serious.  The many layers of 
> "It's impossible for this to happen, but if it does let's do something to 
> try and recover" processing saved that mission several times over.  In some 
> applications, there's no such thing as "halt".

Yeah, having your mars rower forever running in a loop to try to convert
some random string to a number is sure something you want to achieve.

Tino
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From odeits at gmail.com  Mon Feb 16 02:18:50 2009
From: odeits at gmail.com (odeits)
Date: Sun, 15 Feb 2009 23:18:50 -0800 (PST)
Subject: Changing the Image on a button
Message-ID: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>

I want to be able to toggle if the button has an image or text. For
some reason the following code gets the button to have an image but
when i push the button i expect the image to go away but it does not.
Am I missing something?

from Tkinter import *


def do():
    btn.configure(image = None)

root = Tk()
img1 = PhotoImage(file="bacon.gif")

btn = Button(image = img1, command = do, text = "hello" )
btn.img = img1
btn.pack()
root.mainloop()


From odeits at gmail.com  Mon Feb 16 02:31:42 2009
From: odeits at gmail.com (odeits)
Date: Sun, 15 Feb 2009 23:31:42 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
Message-ID: <8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>

On Feb 15, 9:56?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sun, Feb 15, 2009 at 9:17 PM, ?<pyt... at bdurham.com> wrote:
> > I need to test strings to determine if one of a list of chars is in the
> > string. A simple example would be to test strings to determine if they have
> > a vowel (aeiouAEIOU) present.
>
> > I was hopeful that there was a built-in method that operated similar to
> > startswith where I could pass a tuple of chars to be tested, but I could not
> > find such a method.
>
> > Which of the following techniques is most Pythonic or are there better ways
> > to perform this type of match?
>
> > # long and hard coded but short circuits as soon as match found
> > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> > -OR-
>
> > # flexible, but no short circuit on first match
> > if [ char for char in word if char in 'aeiouAEIOU' ]:
>
> Just use the fairly new builtin function any() to make it short-circuit:
>
> if any(char.lower() in 'aeiou' for char in word):
> ? ? do_whatever()
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

If you want to generalize it you should look at sets
http://docs.python.org/library/sets.html

It seems what you are actually testing for is if the intersection of
the two sets is not empty where the first set is the characters in
your word and the second set is the characters in your defined string.



From pythonnutter at gmail.com  Mon Feb 16 02:34:55 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Mon, 16 Feb 2009 18:34:55 +1100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
Message-ID: <af90b3410902152334p73fe32ccrcc1d7505ddcc9a24@mail.gmail.com>

Had a look and it is still under my radar unfortunately because of
TkInter. OceanGUI has a lot of large decencies (Pygame, SDL libraries,
PyObjC, etc.) to install on my system to just to get a GUI thats no
better loking than TkInter which comes pre-installed (no dependencies)
on most every major platform.

If I was writing a game I might be interested, but I'd want to do some
serious skinning of that GUI to make it look better.

For applications installing the full wxWidgets or Qt toolkits would be
less disk space and dependcies than OceanGUI and performance would
probably be higher. TkInter also has many skins/themes you can add
that makes it rather, although not 100% native looking on target
systems.

For example, check out
http://tclmacbag.autons.net/screenshots.phtml

For 86K download/dependencies I can get a rather Mac looking GUI.

Cheers,
PN


2009/2/16  <laplacian42 at gmail.com>:
> I think I just found the GUI toolkit for Python I've been searching
> for. It seems to meet all of the following requirements:
>
>  * free software
>  * small (I don't need batteries -- Python already comes with those.)
>  * easy to use
>  * actively maintained
>  * cross-platform
>  * easy to install
>  * based on a stable and actively-maintained C library
>  * does not depend on an external scripting language (for example,
> Tcl)
>  * well-documented
>  * not too many dependencies
>  * can easily integrate with PyOpenGL
>  * support for accessibility
>
> and it's also written in Python.
>
> I have no idea how it's stayed under the radar in the Python community
> for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
> gui.html). The C library it depends upon? [SDL](http://
> www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).
>
> The sf project page is <http://sourceforge.net/projects/ocemp/>.
>
> Installation only requires getting SDL installed, then PyGame, and
> then a `sudo python setup.py install` for OcempGUI. `cd` into its `doc/
> examples` directory and run a few of the examples (ex. `python
> hello_world.py`).
>
> The part of [the manual](http://ocemp.sourceforge.net/manual/ocempgui-
> manual.html) that seems most like a beginner tutorial is <http://
> ocemp.sourceforge.net/manual/gui_applications.html>.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From matzke at berkeley.edu  Mon Feb 16 02:54:25 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Sun, 15 Feb 2009 23:54:25 -0800
Subject: hist without plotting
In-Reply-To: <49990B3B.5070002@berkeley.edu>
References: <49990B3B.5070002@berkeley.edu>
Message-ID: <49991BB1.7060903@berkeley.edu>

Nevermind, I was running the pylab hist; the numpy.histogram function 
generates the bar counts etc. without plotting the histogram.

Cheers!
Nick

Nick Matzke wrote:
> Hi,
> 
> Is there a way to run the numpy hist function or something similar and 
> get the outputs (bins, bar heights) without actually producing the plot 
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking 
> for...)
> 
> Cheers!
> Nick
> 
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From __peter__ at web.de  Mon Feb 16 02:56:14 2009
From: __peter__ at web.de (Peter Otten)
Date: Mon, 16 Feb 2009 08:56:14 +0100
Subject: hist without plotting
References: <mailman.21.1234766750.11746.python-list@python.org>
Message-ID: <gnb66v$4r3$00$1@news.t-online.com>

Nick Matzke wrote:

> Is there a way to run the numpy hist function or something similar and
> get the outputs (bins, bar heights) without actually producing the plot
> on the screen?
> 
> (R has a plot = false option, something like this is what I'm looking
> for...)

First hit googling for numpy hist led me to

http://www.scipy.org/Tentative_NumPy_Tutorial#head-aa75ec76530ff51a2e98071adb7224a4b793519e

So pylab.hist() plots and numpy.histogram() just calculates.

Peter


From gh at ghaering.de  Mon Feb 16 03:28:41 2009
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 16 Feb 2009 09:28:41 +0100
Subject: Display a list using PyQt
In-Reply-To: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>
References: <c620ff2d0902151836w63800c86r7e440a9a0750dd9d@mail.gmail.com>
Message-ID: <gnb83l$81c$1@ger.gmane.org>

member Basu wrote:
> I'm writing an application with PyQt as the GUI toolkit. I have a
> function that returns a simple list and I would like to update a List
> View widget with it. However I can't get it to work. I'm not sure if I
> need to subclass one of the Model classes, because it is just a list.
> Can someone point me to a simple tutorial or give me instructions on how
> to go about doing this?

The attached example should help. Also see the examples included with PyQt.

-- Gerhard
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From loveshadowdog at yahoo.com  Mon Feb 16 03:46:40 2009
From: loveshadowdog at yahoo.com (loveshadowdog at yahoo.com)
Date: Mon, 16 Feb 2009 00:46:40 -0800 (PST)
Subject: Windows vista
Message-ID: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>

Hi. My name is toru.
I start learning python couple weeks ago.

I install the compiler from python.org.
but I cannot use the IDLE program.
(command line works fine so far)
the error screen says that the my personal fire wall is blocking the
program to run.
I am not sure how to fix this.
By the way, I heard many people said that this is because I am using
windows vista.
Does anyone know how to use IDLE program on Windows Vista machine?

thank you.


From rushenaly at gmail.com  Mon Feb 16 04:34:34 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 01:34:34 -0800 (PST)
Subject: Will multithreading make python less popular?
Message-ID: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>

Hi everybody,
I am an engineer. I am trying to improve my software development
abilities. I have started programming with ruby. I like it very much
but i want to add something more. According to my previous research i
have designed a learning path for myself. It's like something below.
      1. Ruby (Mastering as much as possible)
      2. Python (Mastering as much as possible)
      3. Basic C++ or Basic Java
And the story begins here. As i search on the net,  I have found that
because of the natural characteristics of python such as GIL, we are
not able to write multi threaded programs. Oooops, in a kind of time
with lots of cpu cores and we are not able to write multi threaded
programs. That is out of fashion. How a such powerful language doesn't
support multi threading. That is a big minus for python. But there is
something interesting, something like multi processing. But is it a
real alternative for multi threading. As i searched it is not, it
requires heavy hardware requirements (lots of memory, lots of cpu
power). Also it is not easy to implement, too much extra code...

After all of that, i start to think about omiting python from my
carrier path and directly choosing c++ or java. But i know google or
youtube uses python very much. How can they choose a language which
will be killed by multi threading a time in near future. I like python
and its syntax, its flexibility.

What do you think about multi threading and its effect on python. Why
does python have such a break and what is the fix. Is it worth to make
investment of time and money to a language it can not take advantage
of multi cores?

Thank you...
Rushen


From zhangyunfan2 at gmail.com  Mon Feb 16 04:39:01 2009
From: zhangyunfan2 at gmail.com (vimuser)
Date: Mon, 16 Feb 2009 01:39:01 -0800 (PST)
Subject: How to enum all the users from a windows domain via python win32net 
	module?
Message-ID: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>

I tried the command "net user /DOMAIN" in windows console(cmd.exe),
and it showed me all the usernames in my domain without any problems.
But when I tried it in python with these commands :
info=win32net.NetUserEnum("DOMAIN_NAME",1),
info=win32net.NetUserEnum(r"\\DOMAIN_NAME",1),and
info=win32net.NetUserEnum("\\\\DOMAIN_NAME",1), I all got the System
Error 53 (The network path was not found) .

What should I do, if I intend to enum all the users from a windows
domain via python win32net module?


From mail at timgolden.me.uk  Mon Feb 16 05:00:54 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 16 Feb 2009 10:00:54 +0000
Subject: How to enum all the users from a windows domain via python
	win32net module?
In-Reply-To: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>
References: <3f2bd06b-8f50-4ac4-b023-7c0837490304@u1g2000pre.googlegroups.com>
Message-ID: <49993956.8080100@timgolden.me.uk>

vimuser wrote:
> I tried the command "net user /DOMAIN" in windows console(cmd.exe),
> and it showed me all the usernames in my domain without any problems.
> But when I tried it in python with these commands :
> info=win32net.NetUserEnum("DOMAIN_NAME",1),
> info=win32net.NetUserEnum(r"\\DOMAIN_NAME",1),and
> info=win32net.NetUserEnum("\\\\DOMAIN_NAME",1), I all got the System
> Error 53 (The network path was not found) .
> 
> What should I do, if I intend to enum all the users from a windows
> domain via python win32net module?
> --
> http://mail.python.org/mailman/listinfo/python-list

<code>

import win32net
import win32netcon

dc = win32net.NetGetAnyDCName (None, None)

resume = 0
while 1:
  (_users, total, resume) = \
    win32net.NetUserEnum (
      dc,
      3,
      win32netcon.FILTER_NORMAL_ACCOUNT,
      resume,
      win32netcon.MAX_PREFERRED_LENGTH
    )
  for _user in _users:
    print _user['name'], _user['home_dir'], _user['profile']
  break
  if not resume:
    break


</code>

TJG


From mail at timgolden.me.uk  Mon Feb 16 05:03:02 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 16 Feb 2009 10:03:02 +0000
Subject: [Fwd: Re: Pythonic way to determine if a string is a number]
Message-ID: <499939D6.5060405@timgolden.me.uk>

[Resending after a bounce from mailing list]

python at bdurham.com wrote:
>> try:
>>    float (input)
>> except ValueError:
>>    return False
>> else:
>>    return True
> 
> I follow the semantics, but I don't know why I would prefer the try/else
> technique over the simpler:
> 
> try:
>     float( input )
>     return True
> except ValueError:
>     return False


In this case, I don't think you would. At least I would
say it's no more than 50/50 depending on taste and probably
more like 60/40 in favour of your solution. However
there are situations where try-except-else more 
naturally expresses the code intent. Of course I
can't think of a single one now, and it's not an easy
thing to search my codebase for so I'll just press send
and then think of an example two seconds later!

Really wanted to make sure you were aware of it as an
option; the else clause on try-except (and its cousin
the for-else clause) are easily overlooked / forgotten.

TJG



From kaiser.vocote at gmail.com  Mon Feb 16 05:06:52 2009
From: kaiser.vocote at gmail.com (Andreas Kaiser)
Date: Mon, 16 Feb 2009 02:06:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <47deb5f1-bfae-439d-8239-c6c824a531a3@f20g2000yqg.googlegroups.com>

On 16 Feb., 10:34, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python.

On comp.lang.ruby David Masover wrote this at 29 Jul. 2008, 07:55:
-----
Right now, Ruby shares a problem with Python called the GIL -- the
Global (or
Giant) Interpreter Lock. What this means is that only one Ruby
instruction
may execute at a time. So even though they're using separate OS
threads, and
even though different Ruby threads might run on different cores, the
speed of
your program (at least the Ruby part) is limited to the speed of a
single
core.
-----

Please don't mix threads and parallel processing on more then one CPU
core.

Andreas


From alexionne at gmail.com  Mon Feb 16 05:10:46 2009
From: alexionne at gmail.com (Aleksa Todorovic)
Date: Mon, 16 Feb 2009 11:10:46 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <74e474ac0902160210t591d82d5qd03e0a538671bc0a@mail.gmail.com>

Hi, Rushen!

I'm also new to using Python but from what I've found, GIL is very
intentional decision. It is one of the features of Python which make
it so powerful. I believe that if it didn't have GIL, Python wouldn't
be half near where it is now (regarding it as a language, community,
platform support, popularity, ...).

The most important question is do you really need multi-threading for
what you do? There is lot of software which doesn't require mt at all,
or could be written without mt. Also, if you haven't learnt C++ or
Java yet, mt is not something you should be worried about in the near
future - there are lot of other, more important things, you need to
learn before opening door mt hell :-)

Best,
Aleksa


On Mon, Feb 16, 2009 at 10:34,  <rushenaly at gmail.com> wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>      1. Ruby (Mastering as much as possible)
>      2. Python (Mastering as much as possible)
>      3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...
>
> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?
>
> Thank you...
> Rushen
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Aleksa Todorovic - Lead Programmer
Eipix Entertainment
http://www.eipix.com/


From si.422a at yahoo.com  Mon Feb 16 05:16:51 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Mon, 16 Feb 2009 02:16:51 -0800 (PST)
Subject: explain
Message-ID: <654311.52341.qm@web111202.mail.gq1.yahoo.com>

I download python 2.5.4 and install but I dont know that how perform python?
I dont know from which directory perform python?
Please explain for me.
Thank you


      
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From si.422a at yahoo.com  Mon Feb 16 05:24:13 2009
From: si.422a at yahoo.com (Saeed Iravani)
Date: Mon, 16 Feb 2009 02:24:13 -0800 (PST)
Subject: explain
Message-ID: <255795.88503.qm@web111210.mail.gq1.yahoo.com>

I download python 2.5.4 and install but I dont know that how run python?
I dont know from which directory run python?
Please explain for me.
Thank you


      
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From asmodai at in-nomine.org  Mon Feb 16 05:26:13 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 16 Feb 2009 11:26:13 +0100
Subject: explain
In-Reply-To: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
References: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
Message-ID: <20090216102613.GE39358@nexus.in-nomine.org>

-On [20090216 11:17], Saeed Iravani (si.422a at yahoo.com) wrote:
>I download python 2.5.4 and install but I dont know that how perform python?
>I dont know from which directory perform python?

It would help if you would clarify which operating system you are using.

On Unix/Linux systems you make sure to 'rehash' your $PATH or add the
appropriate directory to the $PATH variable.

On Windows, you set your environment variable PATH to include the path to
Python programs (typically something like C:\Python25), which you can find
under the system control panel.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From michele.simionato at gmail.com  Mon Feb 16 05:27:11 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 02:27:11 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>

On Feb 16, 10:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...

multiprocessing is already implemented for you in the standard
library.
Of course it does not require heavy hardware requirements.

> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?

You can take advantage of multi cores, just not with threads but with
processes,
which BTW is the right way to go in most situations. So (assuming you
are not
a troll) you are just mistaken in thinking that the only way to
use multicores is via multithreading.

          Michele Simionato


From asmodai at in-nomine.org  Mon Feb 16 05:29:16 2009
From: asmodai at in-nomine.org (Jeroen Ruigrok van der Werven)
Date: Mon, 16 Feb 2009 11:29:16 +0100
Subject: Windows vista
In-Reply-To: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
References: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
Message-ID: <20090216102916.GF39358@nexus.in-nomine.org>

-On [20090216 09:50], loveshadowdog at yahoo.com (loveshadowdog at yahoo.com) wrote:
>the error screen says that the my personal fire wall is blocking the
>program to run.

My default Windows Vista x64 installation is not blocking my IDLE at all, so
it might be you're not using the standard Windows firewall but perhaps some
third-party one.

Most of the time in the firewall configuration windows you can add specific
executables to be allowed access. As such you probably have to point it to
the C:\Python25\Python.exe file, but that's just a guess.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
????? ?????? ??? ?? ??????
http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
Earth to earth, ashes to ashes, dust to dust...


From greg.ewing at canterbury.ac.nz  Mon Feb 16 05:45:50 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Mon, 16 Feb 2009 23:45:50 +1300
Subject: ANN: Assembly Line 0.8.2
Message-ID: <mailman.39.1234788593.11746.python-announce-list@python.org>

I have released an updated version of Assembly Line,
my entry in PyWeek 6 and later the Pyggy Awards.

http://media.pyweek.org/dl/1007/greg_pgF09/AssemblyLine-0.8.2.zip

About Assembly Line
-------------------

Become a FADE!

That's Factory Automation Design Engineer for Pixall Manufacturing, the world 
leader in pixellated products.

We give you product designs from our R&D department, and you design and build 
factories to manufacture them as efficiently possible. Make a good profit and 
you'll earn big bonuses and a huge salary!

-- 
Greg


From digitig at gmail.com  Mon Feb 16 06:07:49 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 16 Feb 2009 11:07:49 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <aee48b3c0902160307g394c08aeh23259e6c16dc8d24@mail.gmail.com>

2009/2/16  <rushenaly at gmail.com>:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>      1. Ruby (Mastering as much as possible)
>      2. Python (Mastering as much as possible)
>      3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python.

In a way, you've answered your own question. Why are you learning
three languages? Perhaps you've already realised that being
Turing-complete isn't the last word in language choice; that different
languages make different compromises, so the best language for one
task may not be the best language for a different task. Ok, Python
doesn't cope well with threading. It doesn't cope well with hard
real-time, either. So what? A deep saucepan isn't much use for making
an omlette (it can be done, but it's inefficient), but it's ideal for
making soup. Just because multiple cores are available doesn't mean
they will help your program significantly. Most real-world programs
work just fine in a single core, and it usually just isn't worth all
of the extra design effort, coding effort and debugging effort of
threading to cut the user response time down from a tenth of a second
to a twentieth. For *most* applications the single-thread Python
programmer will have something written, shipped and doing the job
whilst the multi-thread programmer is still trying to debug an
intermittent livelock that goes away whenever instrumentation is
added.  For those few cases where threading is a genuine advantage,
Python is not ideal. But in the real world I doubt they're enough to
make a significant dent in Python's popularity.

-- 
Tim Rowe


From yanegomi at gmail.com  Mon Feb 16 06:50:22 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 03:50:22 -0800
Subject: Creating custom formatter function
Message-ID: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>

Hello Python folks,
    I have a function where I'd like to prefix a format string via a
`prefix' string. The definition of the base method is as follows:

#START CODE
def print_message(prefix, out_stream, fmt, *args, **kwargs):
    """ Print out [prefix]: [message] """

    message = fmt

    if 0 < len(kwargs.keys()):
        message = message % kwargs

    if 0 < len(args):
        message = message % args

    out_stream.write(message + "\n")
#END CODE

    My python 2.4.5 interpreter fails at `message % args' claiming the
following:

  File "logging.py", line 10, in print_message
    message = message % (args)
TypeError: not all arguments converted during string formatting

    Thus I was wondering what the proper means was for formatting
strings. I'm new to this portion of Python, so I obviously didn't
apply the right syntax.
TIA!
-Garrett


From rushenaly at gmail.com  Mon Feb 16 07:24:27 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 04:24:27 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
Message-ID: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>

Hi again,

Dear Andreas

I know about GIL in ruby interpreter, they are trying to solve
problems because of GIL but it is not so important for me because i
like ruby because of its esthetic and it helps me to grasp some
programming concepts. As i know it is not so powerful language like
java. (Powerful language : rich libraries, wide community, very
variety of usage). why i want to learn python because it has syntax
like ruby but it is also powerful language, not of course as much as
java or c++

And also, i am trying to find an answer to the question mark in my
head. Is there a way to use multi cores in python as much effective
and easier as multi threading.

Dear Aleksa

Of course i have a long way to ago even if i am too old for these
things. However, i think that being able to use both cores or more is
a very big plus for execution time, speed like these. I believe many
programs will be rewritten to be able to use multiple cores.

Dear Michele

As i know every process has own hardware sources like memory and cpu
so i think it requires more source than multi threading.

Dear Tim

I want to learn python + c++ or java because of the desire of having
python's felxibility and easiness and c++ or java's stability and
speed and power together.

Thank you
Rushen





From digitig at gmail.com  Mon Feb 16 07:50:42 2009
From: digitig at gmail.com (Tim Rowe)
Date: Mon, 16 Feb 2009 12:50:42 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
Message-ID: <aee48b3c0902160450i56f6a5f7q54aa93879ff67a2f@mail.gmail.com>

2009/2/16  <rushenaly at gmail.com>:

> I want to learn python + c++ or java because of the desire of having
> python's felxibility and easiness and c++ or java's stability and
> speed and power together.

Yes, that's what I mean by different tradeoffs. Python is much easier
to program in than C++ or Java (in my experience, at least), but C++
and Java scale better and at least have the potential to be faster.
I'm not convinced that library support is significantly better for C++
or Java -- Python's libraries seem pretty rich to me. And that extra
speed might not be needed as often as you think. My postgrad
dissertation involved heavy number-crunching on large data sets, and
in my proposal I said I'd switch from Python to C++ when Python got
too slow. In fact, Python never did get too slow (I didn't even have
to switch to numpy), and plugging together ad-hoc modules, defined in
an XML script, was a dream in Python when I'd probably still be coding
it today in C++. Horses for courses. It's almost always wrong to say
that language A is better than language B; the most you can say is
that language A is better than language B for some specific task.


-- 
Tim Rowe


From tim.wintle at teamrubber.com  Mon Feb 16 07:54:36 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 16 Feb 2009 12:54:36 +0000
Subject: Module to read/write MIDI ?
In-Reply-To: <slrngph5b2.2qd.peter@box8.pjb.com.au>
References: <slrngph5b2.2qd.peter@box8.pjb.com.au>
Message-ID: <1234788876.5567.2.camel@tim-laptop>

> I had my first look around pypi.python.org/pypi yesterday and didn't
> see anything.  Is there a MIDI-module for Python ?  If not, I'll
> email Sean to ask if he'd mind me translating his module into Python3...

<http://www.mxm.dk/products/public/pythonmidi>

This is the only project I have seen that aims to do that - I haven't
actually used it, and there might be others out there (I believe pygame
<www.pygame.org> supports midi-output).



> 
> Regards,  Peter
> 



From jldunn2000 at googlemail.com  Mon Feb 16 07:59:32 2009
From: jldunn2000 at googlemail.com (loial)
Date: Mon, 16 Feb 2009 04:59:32 -0800 (PST)
Subject: replace ftp by local copy
Message-ID: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>

I have been given an old python application that calls ftplib in many
places to copy files to a remote server.

I have been given the task of cloneing this code so that ftp is not
used, but files are just copied locally in a scenerio where ftp is not
available. The code is not well structured which makes this more
difficult.

Before starting this just wondered if anyone has previously done
anything like overriding the ftplib module so that I can leave the
existing code largely unchanged but have the ftp commands just copy
files locally?

Just thought I'd ask before getting started.






From fmaresca at gmail.com  Mon Feb 16 08:02:06 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 11:02:06 -0200
Subject: logging and daemons
Message-ID: <20090216130206.GA20397@gmail.com>


Hello.

I'm in the process of replacing a custom logger class in one of my apps
that has several daemons. In the last step of daemonizing a program,
after closing fds, stderr and stdout are redirected to the logfile of
the program.

Now, I'm trying to use TimedRotatingFileHandler as the only channel when
the programs run in daemon mode. My problem is: I can't see a goog way
to redirect stderr/stdout both to the logger.

Note that I don't have any print statements in any of my code, but I
can't be sure about all the modules I'm importing, and I like to get any
uncached exception info that may go to stderr/stdout to show up in the
logfiles.

Any ideas?
Thanks a lot,

-- 
Fernando 
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From yanegomi at gmail.com  Mon Feb 16 08:07:45 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 05:07:45 -0800
Subject: logging and daemons
In-Reply-To: <20090216130206.GA20397@gmail.com>
References: <20090216130206.GA20397@gmail.com>
Message-ID: <364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:02 AM, Fernando M. Maresca <fmaresca at gmail.com> wrote:
>
> Hello.
>
> I'm in the process of replacing a custom logger class in one of my apps
> that has several daemons. In the last step of daemonizing a program,
> after closing fds, stderr and stdout are redirected to the logfile of
> the program.
>
> Now, I'm trying to use TimedRotatingFileHandler as the only channel when
> the programs run in daemon mode. My problem is: I can't see a goog way
> to redirect stderr/stdout both to the logger.
>
> Note that I don't have any print statements in any of my code, but I
> can't be sure about all the modules I'm importing, and I like to get any
> uncached exception info that may go to stderr/stdout to show up in the
> logfiles.
>
> Any ideas?
> Thanks a lot,

Hopefully this'll answer your question:

You can actually set sys.std[err|out] to your ?file? descriptor of
choice in python (it has to have read, write, and flush methods, IIRC
to function). The only thing is (like all things dealing with multiple
file descriptors like std[err|out]) the output may come in out of
order due to flushing and insertion into the buffers, but it shouldn't
be as much of an issue considering that the file descriptor for both
items is the same descriptor, but this is just a note of forewarning.

nose does something similar with the way that it scrapes stderr /
stdout for exception data and messages.

-Garrett


From fmaresca at gmail.com  Mon Feb 16 08:15:16 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 11:15:16 -0200
Subject: logging and daemons
In-Reply-To: <364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
Message-ID: <20090216131516.GA21655@gmail.com>

Hello, thanks for the answer.

On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
> You can actually set sys.std[err|out] to your ?file? descriptor of
> choice in python (it has to have read, write, and flush methods, IIRC
> to function). The only thing is (like all things dealing with multiple
> file descriptors like std[err|out]) the output may come in out of
> order due to flushing and insertion into the buffers, but it shouldn't
> be as much of an issue considering that the file descriptor for both
> items is the same descriptor, but this is just a note of forewarning.
Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
fd of the logfile change in every rotation of the logfile. So the direct
approach of std[out|err] redirection to the logfile fd obtained from
the logger instance is unusable (it works fine with a simple file
handler). 
I'm looking into this because I really need rotating, because when
debugging is on, large amounts of data are logged, and because I like
the logging module approach in every aspect.

Also, may it be possible to derive the class and add a file-like write
method? Anyone using logging in this manner?


Cheers,
-- 
Fernando
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From andrew at acooke.org  Mon Feb 16 08:17:06 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 16 Feb 2009 10:17:06 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <977bad202990de5797c2efcf8d50ed81.squirrel@localhost>

rushenaly at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
>       1. Ruby (Mastering as much as possible)
>       2. Python (Mastering as much as possible)
>       3. Basic C++ or Basic Java
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...

I understand why you are asking this question - you want to learn, and
that is good - but as you say, you are a beginner, and you are focussing
on one thing that has caught your eye when there are many other issues
that are more important.

The GIL is an implementation detail.  I suspect that it could be largely
removed if there was sufficient need.  But that still wouldn't make Python
a good language for programming on multiple cores.  That's not as big a
deal as you think, because we currently DON'T KNOW what would make a good
language for programming on multiple cores - it's an open topic in the
wider community.

It may be, for example, that the best approaches for concurrent
programming require a lot of automatic pre-processing that needs static
type information.  Or that mutable state is simply too much of a problem
and pure functional programming is the only way forwards.  Both of these
would be much more serious problems for Python than the GIL.  On the other
hand, Python has inbuilt support for co-routines.  Experience gained with
that might lead towards a more actors-like solution that fits naturally
within Python.

So my first point is that you are worrying about a problem that no-one yet
know how to solve, and worrying about a small and largely irrelevant part
of that.


Second, you are committing the common mistake of over-estimating the
importance of efficiency.  Python is not a fast language; it never has
been.  That does not stop it being extremely useful.  This is largely
because when it needs to do "hard work" it delegates to C libraries.  Why
can this not apply to concurrent programming too?  Maybe the top level
logic will stay in a single thread, because that is easier to program, but
libraries will use multiple cores.

So my second point is that you are being too restrictive in considering
what a future solution might look like.


In conclusion, then, I strongly suggest you stop worrying so much about
things that you don't yet have the experience to see completely, and
instead get more experience under your belt.  That sounds more harsh than
I really mean - obviously worrying about this kind of thing is part of
learning.

Incidentally, if you already know Ruby and want to improve your abilities
I am not sure learning Python is the best use of your time.  The two
languages are very similar.  You might be better taking a huge leap to
something like Haskell or OCaml.  Or, if you want to get hands-on
experience of concurrency now, Erlang.

Andrew



> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?
>
> Thank you...
> Rushen
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From andrew at acooke.org  Mon Feb 16 08:21:47 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 16 Feb 2009 10:21:47 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
Message-ID: <2f9b1132b1d38c74810f4021f6b3101b.squirrel@localhost>

andrew cooke wrote:
> something like Haskell or OCaml.  Or, if you want to get hands-on
> experience of concurrency now, Erlang.

I think for once I said something useful there.  I think you would
probably enjoy Erlang, and it would be very useful for understanding
concurrency.  Also, Erlang is not as strange a language as Haskell or
OCaml.  You will probably find it quite familiar.  And there's an
excellent book (Joe Armstrong's "Programming Erlang").

At the risk of hastening Python's demise :o) I strongly encourage you to
learn Erlang instead of Python.

Andrew




From yanegomi at gmail.com  Mon Feb 16 08:23:05 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Mon, 16 Feb 2009 05:23:05 -0800
Subject: logging and daemons
In-Reply-To: <20090216131516.GA21655@gmail.com>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<20090216131516.GA21655@gmail.com>
Message-ID: <364299f40902160523l68ff57e4yac4ffbc828360d35@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca <fmaresca at gmail.com> wrote:
> Hello, thanks for the answer.
>
> On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>> You can actually set sys.std[err|out] to your ?file? descriptor of
>> choice in python (it has to have read, write, and flush methods, IIRC
>> to function). The only thing is (like all things dealing with multiple
>> file descriptors like std[err|out]) the output may come in out of
>> order due to flushing and insertion into the buffers, but it shouldn't
>> be as much of an issue considering that the file descriptor for both
>> items is the same descriptor, but this is just a note of forewarning.
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler).
> I'm looking into this because I really need rotating, because when
> debugging is on, large amounts of data are logged, and because I like
> the logging module approach in every aspect.

I cannot comment about this because I haven't used this module before.

> Also, may it be possible to derive the class and add a file-like write
> method? Anyone using logging in this manner?

Indeed, yes. That's sort of what I was hinting at with my statement
that you must have a read, write and flush method for your class. Now
that I think back, other modules like pexpect implement simple logic
to deal with writing to psuedo file descriptors as well.

Locking the data streams may or may not be required -- I'm not sure
what the underlaying portions of python expose or do not expose in
terms of scheduling in output streams.

HTH,
-Garrett


From rushenaly at gmail.com  Mon Feb 16 08:26:52 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 05:26:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
Message-ID: <0b304e24-1017-4c6b-8b94-6054f1dadc05@j38g2000yqa.googlegroups.com>

Dear Andrew,

I think reading "beating the averages" by paul graham before some
experience is not a very good decision.
:)

Thank you
Andrew


From veerendra.jangid at gmail.com  Mon Feb 16 08:39:23 2009
From: veerendra.jangid at gmail.com (VEERENDRA)
Date: Mon, 16 Feb 2009 05:39:23 -0800 (PST)
Subject: to access the gretest
Message-ID: <2b89626e-e038-4eef-aa74-4405b4c3c6bb@s9g2000prg.googlegroups.com>

Vjrocks.comhttp://www.vjrocks.com/
BCA
BCA Ist YEARhttp://www.vjrocks.com/BCA_Ist_year.html
BCA IInd YEARhttp://www.vjrocks.com/BCA_IInd_year.html
BCA IIIrd YEARhttp://www.vjrocks.com/BCA_IIIrd_year.html

LANGUAGE

Introduction to Computershttp://www.vjrocks.com/Introduction to
Computers.html
Programming IN Chttp://www.vjrocks.com/Introduction to Computers.html
C++http://www.vjrocks.com/CPlusPlus.html
Javahttp://www.vjrocks.com/Java.htmlVisual Basic.html
Visual Basichttp://www.vjrocks.com/Visual Basic.html


From ndbecker2 at gmail.com  Mon Feb 16 08:39:35 2009
From: ndbecker2 at gmail.com (Neal Becker)
Date: Mon, 16 Feb 2009 08:39:35 -0500
Subject: logging and daemons
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<20090216131516.GA21655@gmail.com>
	<364299f40902160523l68ff57e4yac4ffbc828360d35@mail.gmail.com>
Message-ID: <gnbqan$33p$1@ger.gmane.org>

Garrett Cooper wrote:

> On Mon, Feb 16, 2009 at 5:15 AM, Fernando M. Maresca <fmaresca at gmail.com>
> wrote:
>> Hello, thanks for the answer.
>>
>> On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>>> You can actually set sys.std[err|out] to your ?file? descriptor of
>>> choice in python (it has to have read, write, and flush methods, IIRC
>>> to function). The only thing is (like all things dealing with multiple
>>> file descriptors like std[err|out]) the output may come in out of
>>> order due to flushing and insertion into the buffers, but it shouldn't
>>> be as much of an issue considering that the file descriptor for both
>>> items is the same descriptor, but this is just a note of forewarning.
>> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
>> fd of the logfile change in every rotation of the logfile. So the direct
>> approach of std[out|err] redirection to the logfile fd obtained from
>> the logger instance is unusable (it works fine with a simple file
>> handler).
>> I'm looking into this because I really need rotating, because when
>> debugging is on, large amounts of data are logged, and because I like
>> the logging module approach in every aspect.
> 
> I cannot comment about this because I haven't used this module before.
> 
>> Also, may it be possible to derive the class and add a file-like write
>> method? Anyone using logging in this manner?
> 
> Indeed, yes. That's sort of what I was hinting at with my statement
> that you must have a read, write and flush method for your class. Now
> that I think back, other modules like pexpect implement simple logic
> to deal with writing to psuedo file descriptors as well.
> 
> Locking the data streams may or may not be required -- I'm not sure
> what the underlaying portions of python expose or do not expose in
> terms of scheduling in output streams.
> 
> HTH,
> -Garrett
> --
> http://mail.python.org/mailman/listinfo/python-list

I use this, but for my own specialized purpose:

import atexit
class logger (object):
    def __init__ (self, name):
        self.name = name               # final file name
        self.f = open (self.name, 'w')
        atexit.register (self.__del__)
    def write (self, stuff):
        self.f.write (stuff)
    def close (self):
        self.f.close()
    def flush (self):
        self.f.flush()
    def reopen (self):
        self.f.flush()
        self.f.close()
        os.rename (self.name, self.name + '.old')
        self.f = open (self.name, 'w')
    def __del__ (self):
        try:
            os.remove (self.name + '.old')
        except:
            pass





From a_modelo at yahoo.com  Mon Feb 16 08:45:09 2009
From: a_modelo at yahoo.com (www.livtotravel.blogspot.com)
Date: Mon, 16 Feb 2009 05:45:09 -0800 (PST)
Subject: What is a phyton?
Message-ID: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>

is phyton a programming language? what can a python do? how is it
different from others?


From alan.isaac at gmail.com  Mon Feb 16 08:47:11 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Mon, 16 Feb 2009 13:47:11 GMT
Subject: Creating custom formatter function
In-Reply-To: <mailman.38.1234785025.11746.python-list@python.org>
References: <mailman.38.1234785025.11746.python-list@python.org>
Message-ID: <z7eml.586$Bl.525@nwrddc01.gnilink.net>

On 2/16/2009 6:50 AM Garrett Cooper apparently wrote:
> I was wondering what the proper means was for formatting
> strings.

http://docs.python.org/library/string.html#string-formatting

http://docs.python.org/library/string.html#template-strings

http://docs.python.org/library/stdtypes.html#string-formatting

As for the last: "values must be a tuple with exactly the number
of items specified by the format string, or a single mapping
object (for example, a dictionary)" unless you need only a
single argument in your format string.

hth,
Alan Isaac


From mamahitasela at yahoo.com  Mon Feb 16 08:47:22 2009
From: mamahitasela at yahoo.com (Mamahita Sela)
Date: Mon, 16 Feb 2009 05:47:22 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
Message-ID: <510115.40482.qm@web46216.mail.sp1.yahoo.com>

Dear All,

I have read several howtos for threading in PyGTK. I have tried some but with no luck.

What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.
 
I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done. 

(I am using 2.5.1, pygtk 2.10.6 on Linux x86)

This is my code:
import threading
import commands 
import gtk
import gobject

gtk.gdk.threads_init()


class PingHost(threading.Thread):
    def __init__(self, host):
        threading.Thread.__init__(self)
        self.host = host
        self.result = ()
    def run(self):
        self.result = self.host, commands.getstatusoutput('ping %s -c1' %(self.host))[0]

class Main:
    def __init__(self):
        self.win = gtk.Window()
        self.win.connect('destroy', gtk.main_quit)
        #
        self.textb = gtk.TextBuffer()
        self.textv = gtk.TextView(self.textb)
        self.textv.set_size_request(500, 500)
        #
        self.win.add(self.textv)
        self.win.show_all()
        #
        gobject.timeout_add(5000, self.do_ping)

        def do_ping(self):
        all_threads = []
        #
        for h in range(100, 105):
            host = '192.168.0.%d' %(h)
            #
            worker = PingHost(host)
            worker.start()
            all_threads.append(worker)
        #
        for t in all_threads:
            t.join()
            print t.result
        #
        return True


if __name__ == '__main__':
    app = Main()
    gtk.main()


Any help would be appreciated :)
Best regards,
M


      



From alexionne at gmail.com  Mon Feb 16 09:05:26 2009
From: alexionne at gmail.com (Aleksa Todorovic)
Date: Mon, 16 Feb 2009 15:05:26 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
Message-ID: <74e474ac0902160605g1cac34e5n387f22250be047ee@mail.gmail.com>

Or the other way around :-)

Little off-topic, but...

After several months of fighting with Java threads, dead locks, live
locks, race conditions, I've rewritten my game server synchronization
so that threads are executed in concurrent way (with only exceptions
being socket sending and recieving threads), and all synchronization
is implemented on top of Java blocking structures (little blasphemy:
the way Stackless does it). After that change, the game suddenly
started working like a charm!


On Mon, Feb 16, 2009 at 13:24,  <rushenaly at gmail.com> wrote:
> Of course i have a long way to ago even if i am too old for these
> things. However, i think that being able to use both cores or more is
> a very big plus for execution time, speed like these. I believe many
> programs will be rewritten to be able to use multiple cores.



-- 
Aleksa Todorovic - Lead Programmer
Eipix Entertainment
http://www.eipix.com/


From rushenaly at gmail.com  Mon Feb 16 09:18:35 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 06:18:35 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
	<mailman.50.1234793130.11746.python-list@python.org>
Message-ID: <6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>

Dear Aleksa,

As you mentioned, using multi cores makes programs more fast and more
popular. But what about stackless python? Does it interpret same set
of python libraries with Cpython or Does it have a special sub set?

Thank you
Rusen


From python at rgbaz.eu  Mon Feb 16 09:35:05 2009
From: python at rgbaz.eu (Python)
Date: Mon, 16 Feb 2009 15:35:05 +0100
Subject: What is a phyton?
In-Reply-To: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
Message-ID: <60C24207-5688-42E9-AD21-D07AB655AB76@rgbaz.eu>


On 16 feb 2009, at 14:45, www.livtotravel.blogspot.com wrote:

> is phyton a programming language? what can a python do? how is it
> different from others?
> --
If i were to replace 'python' with 'french'
would you be willing to write the answer in one email?
it's gonna be a loooooong email...

if you want to know, type the same questions in google...
or start by reading http://www.python.org

if you don;t want that, then maybe go to a zoo and follow the signs ;)

gr
Arno


From thorsten at thorstenkampe.de  Mon Feb 16 09:37:29 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Mon, 16 Feb 2009 15:37:29 +0100
Subject: What is a phyton?
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
Message-ID: <MPG.240398901e426a559897c4@news.individual.de>

* www.livtotravel.blogspot.com (Mon, 16 Feb 2009 05:45:09 -0800 (PST))
> is phyton a programming language?

http://en.wikipedia.org/wiki/Phyton


From exarkun at divmod.com  Mon Feb 16 09:44:36 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Mon, 16 Feb 2009 09:44:36 -0500
Subject: Threads in PyGTK: keep typing while ping-ing
In-Reply-To: <510115.40482.qm@web46216.mail.sp1.yahoo.com>
Message-ID: <20090216144436.12853.561778781.divmod.quotient.10894@henry.divmod.com>

On Mon, 16 Feb 2009 05:47:22 -0800 (PST), Mamahita Sela <mamahitasela at yahoo.com> wrote:
>Dear All,
>
>I have read several howtos for threading in PyGTK. I have tried some but with no luck.
>
>What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.

You don't need threads for this.  The GTK mainloop supports socket event
sources.  This lets you deal with the GUI and with the network in a single
thread without blocking anything.

>
>I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done.

This is because you're joining the threads in the GTK thread.  Joining
blocks until the thread being joined exits.  While you're blocking the
GTK thread like this, the GTK GUI is not updated.  If you want to keep
using threads, then you need a way to avoid joining the threads until
you know they're done.

Jean-Paul


From me at gustavonarea.net  Mon Feb 16 09:50:22 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 06:50:22 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com>
Message-ID: <a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com>

On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> I lack the context to see how this could be fixed in your case, but
> this a not a show stopper, you can just keep the original decorator
> and forget about making itsignature preserving.

I'm sorry for the possibly dumb question, but how can I do that?

Thanks for all the time you've spent on this, Michele.

  - Gustavo.


From deets at nospam.web.de  Mon Feb 16 09:52:55 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 15:52:55 +0100
Subject: What is a phyton?
In-Reply-To: <MPG.240398901e426a559897c4@news.individual.de>
References: <d65f30f4-719a-483d-b7df-8c5436c4f195@b38g2000prf.googlegroups.com>
	<MPG.240398901e426a559897c4@news.individual.de>
Message-ID: <6vtcu7Flu37sU1@mid.uni-berlin.de>

Thorsten Kampe schrieb:
> * <REMOVED>(Mon, 16 Feb 2009 05:45:09 -0800 (PST))
>> is phyton a programming language?
> 
> http://en.wikipedia.org/wiki/Phyton

Thanks for quoting the OPs spam name so that the visibility of his post 
  is increased.

Diez


From michele.simionato at gmail.com  Mon Feb 16 09:56:20 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 06:56:20 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com>
Message-ID: <89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com>

On Feb 16, 3:50?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > I lack the context to see how this could be fixed in your case, but
> > this a not a show stopper, you can just keep the original decorator
> > and forget about making itsignature preserving.
>
> I'm sorry for the possibly dumb question, but how can I do that?
>
> Thanks for all the time you've spent on this, Michele.
>
> ? - Gustavo.

Let the original code as it is. If ain't broken, don't fix it.


From me at gustavonarea.net  Mon Feb 16 10:07:15 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:07:15 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com>
Message-ID: <89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com>

On Feb 16, 3:56 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 3:50 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
>
> > On Feb 14, 3:27 pm, Michele Simionato <michele.simion... at gmail.com>
> > wrote:
>
> > > I lack the context to see how this could be fixed in your case, but
> > > this a not a show stopper, you can just keep the original decorator
> > > and forget about making itsignature preserving.
>
> > I'm sorry for the possibly dumb question, but how can I do that?
>
> > Thanks for all the time you've spent on this, Michele.
>
> >   - Gustavo.
>
> Let the original code as it is. If ain't broken, don't fix it.

But the problem is that it is broken.

That decorator is for controller actions in Pylons-powered web
applications (which are instance methods). Pylons inspects the
action's signature to find what parameters it's going to pass to its
instance method, which fails because my current decorator changes the
signature.


From mail at microcorp.co.za  Mon Feb 16 10:09:55 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Mon, 16 Feb 2009 17:09:55 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
Message-ID: <00c501c99049$361f40c0$0d00a8c0@hendrik>

"andrew cooke" <andrew at a....org> wrote:


>The GIL is an implementation detail.  I suspect that it could be largely
>removed if there was sufficient need.  But that still wouldn't make Python
>a good language for programming on multiple cores.  That's not as big a
>deal as you think, because we currently DON'T KNOW what would make a good
>language for programming on multiple cores - it's an open topic in the
>wider community.

Those who do not study history are doomed to repeat it.

Occam was the language that should have won the marketing
prize, but didn't.

- Hendrik




From michele.simionato at gmail.com  Mon Feb 16 10:18:56 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 07:18:56 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com>
Message-ID: <7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com>

On Feb 16, 4:07?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> But the problem is that it is broken.
>
> That decorator is for controller actions in Pylons-powered web
> applications (which are instance methods). Pylons inspects the
> action's signature to find what parameters it's going to pass to its
> instance method, which fails because my current decorator changes the
> signature.

Yes, I am saying don't mess with the internal mechanism of Pylons and
leave it as
it was. Or was it broken from the beginning? The only reason I see for
you
to touch those things is if you are a Pylons core developer.


From germangutierrezg at yahoo.es  Mon Feb 16 10:28:52 2009
From: germangutierrezg at yahoo.es (=?iso-8859-1?Q?Germ=E1n_Guti=E9rrez?=)
Date: Mon, 16 Feb 2009 07:28:52 -0800 (PST)
Subject: RedHat 4
Message-ID: <707520.41882.qm@web24601.mail.ird.yahoo.com>

Hi,

I need to confirm and certificate python 2.5 works in a RedHat Enterprise 4 and I don't know where I find that information. Please, if anybody knows some URL in RedHat or Python with this information email me.

Thanks

 Germ?n Guti?rrez Gayoso
Temuco



      
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From me at gustavonarea.net  Mon Feb 16 10:29:32 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:29:32 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com>
Message-ID: <6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com>

On Feb 16, 4:18 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> Yes, I am saying don't mess with the internal mechanism of Pylons and
> leave it as
> it was. Or was it broken from the beginning? The only reason I see for
> you
> to touch those things is if you are a Pylons core developer.

It was broken from the beginning on Pylons.

I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
as of version 2. The decorator has always worked in TurboGears because
of the way TG finds the action arguments, but now I'm working to make
it work in Pylons too, but this is the only problem that has stopped
me from making it work under Pylons.

Thanks.


From lie.1296 at gmail.com  Mon Feb 16 10:38:58 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Mon, 16 Feb 2009 15:38:58 +0000 (UTC)
Subject: Python interface to ODF documents?
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
Message-ID: <gnc1ag$ucn$1@ger.gmane.org>

On Sun, 15 Feb 2009 22:03:25 +0200, Dotan Cohen wrote:

> Is there a Python interface to ODF documents? I'm thinking of something
> that will import, for example, an ADS spreadsheet into a
> multidimensional array (including formulas and formatting) and let me
> manipulate it, then save it back.
> 

Since python is one of OpenOffice.org's Macro language, depending on your 
need, you might be able to use that as well.



From michele.simionato at gmail.com  Mon Feb 16 10:40:08 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 07:40:08 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com>
Message-ID: <2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com>

On Feb 16, 4:29?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 16, 4:18 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > Yes, I am saying don't mess with the internal mechanism of Pylons and
> > leave it as
> > it was. Or was it broken from the beginning? The only reason I see for
> > you
> > to touch those things is if you are a Pylons core developer.
>
> It was broken from the beginning on Pylons.
>
> I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> as of version 2. The decorator has always worked in TurboGears because
> of the way TG finds the action arguments, but now I'm working to make
> it work in Pylons too, but this is the only problem that has stopped
> me from making it work under Pylons.
>
> Thanks.

I see. I would ask on the Pylons list. I suspect a bound method is
passed and that you will
need to extract the corresponding function with .im_func, then making
sure that you pass
the self argument correctly. But this is wild guess since I have no
idea of how Pylons decorators
work internally as compared to TurboGears decorators.


From jcd at sdf.lonestar.org  Mon Feb 16 10:51:49 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 10:51:49 -0500
Subject: RedHat 4
In-Reply-To: <707520.41882.qm@web24601.mail.ird.yahoo.com>
References: <707520.41882.qm@web24601.mail.ird.yahoo.com>
Message-ID: <1234799509.23811.3.camel@aalcdl07.lib.unc.edu>

It *works* in RHEL 4, but it doesn't come as a package.  RHEL4 ships
with Python 2.3, and RHEL 5 only ships with Python 2.4, even though 2.5
had been out for god knows how long when it came out.

Though I haven't tested it, I wouldn't recommend replacing the system's
python binary with 2.5 if you do install it yourself.  Instead, install
it to python2.5, and set the shebang line (#!) on your scripts to point
to /usr/local/bin/python2.5  (or wherever you install it).  

Cheers,
Cliff

On Mon, 2009-02-16 at 07:28 -0800, Germ?n Guti?rrez wrote:
> Hi,
> 
> I need to confirm and certificate python 2.5 works in a RedHat
> Enterprise 4 and I don't know where I find that information. Please,
> if anybody knows some URL in RedHat or Python with this information
> email me.
> 
> Thanks
>  
> Germ?n Guti?rrez Gayoso
> Temuco
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From cd at okunah.de  Mon Feb 16 10:54:10 2009
From: cd at okunah.de (Christof Donat)
Date: Mon, 16 Feb 2009 16:54:10 +0100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <gnc25e$vis$1@svr7.m-online.net>

Hi,

> But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power).

Not necessarily.

For the memory, modern operating Systems can ustilize a copy on write 
semantics in their Applications virtual memory space. That means that after 
starting a new process with fork(), the new Process shares all physical 
Memory Pages with the original one as long a none of them writes to wome 
Memory. The first write is cought by the OS. Then the Page will be copied 
and the writing process will in future use the new copy of that page while 
the other one (or eventually many) stay with the original. Multiprocessing 
needs more Memory than well optimized Multithreading, but it is not as bad 
as it is often said.

For the CPU: There are two things that make the difference here.

One ist Context Switching. When the OS switches between two threads of the 
same Process, it does not need to change the memory lookup table. When 
switching between Processes that is always necessary. Switching from a 
Thread of Process A to a Thread of Process B is just like switching from A 
to B.

Using Threads just increases the probability that the OS can do a faster 
Context Switch. So Threads are faster here, but it is not a too big issue as 
well.

The Second Thing is Communication. With Threds you can simply use variables 
to communicate between Threads. To Prevent conflicting access to those 
Variables you will use e.g. mutexes. That can be done with Shared Memory as 
well. Shared Memory is a bit more difficult to handle than simply using the 
heap, but again the impact is not really so big.

Google uses Processes for the Tabs in Chrome, because that way they get 
around many Memory Management Problems they would have with Threads or with 
a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay 
a bit with Memory and CPU but in many situations you get a much simpler 
programming model.

Christof




From me at gustavonarea.net  Mon Feb 16 10:59:41 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 07:59:41 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com>
Message-ID: <17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>

On Feb 16, 4:40 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> > It was broken from the beginning on Pylons.
>
> > I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> > as of version 2. The decorator has always worked in TurboGears because
> > of the way TG finds the action arguments, but now I'm working to make
> > it work in Pylons too, but this is the only problem that has stopped
> > me from making it work under Pylons.
>
> > Thanks.
>
> I see. I would ask on the Pylons list. I suspect a bound method is
> passed and that you will
> need to extract the corresponding function with .im_func, then making
> sure that you pass
> the self argument correctly. But this is wild guess since I have no
> idea of how Pylons decorators
> work internally as compared to TurboGears decorators.

I've not seen anything special in Pylons or TurboGears 2 decorators,
except that they are all functions that use the decorator package --
while my decorator is a class that doesn't use the decorator package
yet.

My attempt to turn that decorator into a signature preserving one
using the decorator packages fails even on TurboGears 2. As of
decorator 3.0.1, I get this error:
    TypeError: You are decorating a non function: <unbound method
SecurePanel.__before__>

Isn't this caused by the fact that my decorator is a class, or the way
such a class is defined (whose code is in the first post of the
thread)? I can turn it into a function because I'm sure I'll work --
although I wanted a class to make it easier to customize.

Thanks.


From me at gustavonarea.net  Mon Feb 16 11:13:52 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 08:13:52 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>
Message-ID: <e266d916-b762-4039-8d18-72de2555d615@m16g2000vbp.googlegroups.com>

On Feb 16, 4:59 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> On Feb 16, 4:40 pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
>
>
> > > It was broken from the beginning on Pylons.
>
> > > I'm a TurboGears 2 core developer, and TurboGears is powered by Pylons
> > > as of version 2. The decorator has always worked in TurboGears because
> > > of the way TG finds the action arguments, but now I'm working to make
> > > it work in Pylons too, but this is the only problem that has stopped
> > > me from making it work under Pylons.
>
> > > Thanks.
>
> > I see. I would ask on the Pylons list. I suspect a bound method is
> > passed and that you will
> > need to extract the corresponding function with .im_func, then making
> > sure that you pass
> > the self argument correctly. But this is wild guess since I have no
> > idea of how Pylons decorators
> > work internally as compared to TurboGears decorators.
>
> I've not seen anything special in Pylons or TurboGears 2 decorators,
> except that they are all functions that use the decorator package --
> while my decorator is a class that doesn't use the decorator package
> yet.
>
> My attempt to turn that decorator into a signature preserving one
> using the decorator packages fails even on TurboGears 2. As of
> decorator 3.0.1, I get this error:
>     TypeError: You are decorating a non function: <unbound method
> SecurePanel.__before__>
>
> Isn't this caused by the fact that my decorator is a class, or the way
> such a class is defined (whose code is in the first post of the
> thread)? I can turn it into a function because I'm sure I'll work --
> although I wanted a class to make it easier to customize.
>
> Thanks.


This is another attempt, where the decorator is a still a class but
uses an auxiliary function:
http://paste.chrisarndt.de/paste/38bf8a8443614464968d424e1f2d4182

However, that raises this exception:
http://paste.chrisarndt.de/paste/f90bc9a058254e2ca5660882011752a7?wrap=no


From michele.simionato at gmail.com  Mon Feb 16 11:18:00 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 08:18:00 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com>
Message-ID: <13ae3295-912e-48a3-bd94-41186ff75b88@e18g2000vbe.googlegroups.com>

On Feb 16, 4:59?pm, Gustavo Narea <m... at gustavonarea.net> wrote:
> I've not seen anything special in Pylons or TurboGears 2 decorators,
> except that they are all functions that use the decorator package --
> while my decorator is a class that doesn't use the decorator package
> yet.
>
> My attempt to turn that decorator into a signature preserving one
> using the decorator packages fails even on TurboGears 2. As of
> decorator 3.0.1, I get this error:
> ? ? TypeError: You are decorating a non function: <unbound method
> SecurePanel.__before__>
>
> Isn't this caused by the fact that my decorator is a class, or the way
> such a class is defined (whose code is in the first post of the
> thread)? I can turn it into a function because I'm sure I'll work --
> although I wanted a class to make it easier to customize.
>
> Thanks.

The decorator class is fine, the error in clearly in what you pass to
the decorator.
You are trying to decorate an unbound method SecurePanel.__before__:
are you
sure this is really what you want to decorate? Are you decorating
automatically all methods
of SecurePanel? I have already mentioned it, but you can extract the
underlying function
from the method by using  SecurePanel.__before__.im_func if you really
want.


From dotancohen at gmail.com  Mon Feb 16 11:18:42 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 18:18:42 +0200
Subject: Python interface to ODF documents?
In-Reply-To: <gnc1ag$ucn$1@ger.gmane.org>
References: <880dece00902151203v2ba64befjb2d4b29a688143a5@mail.gmail.com>
	<gnc1ag$ucn$1@ger.gmane.org>
Message-ID: <880dece00902160818h77fc3509tf64e0c7788f72119@mail.gmail.com>

> Since python is one of OpenOffice.org's Macro language, depending on your
> need, you might be able to use that as well.
>

That's not a bad idea. Thanks!

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From seb.binet at gmail.com  Mon Feb 16 11:25:41 2009
From: seb.binet at gmail.com (seb.binet at gmail.com)
Date: Mon, 16 Feb 2009 08:25:41 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<gnc25e$vis$1@svr7.m-online.net>
Message-ID: <acecb8d6-fe7d-489d-b134-f68f1fded636@m42g2000yqb.googlegroups.com>

hi there,

[snip]
> Google uses Processes for the Tabs in Chrome, because that way they get
> around many Memory Management Problems they would have with Threads or with
> a singlethreaded reactor. Using Processes is not per se a bad Idea. You pay
> a bit with Memory and CPU but in many situations you get a much simpler
> programming model.

note also that one can bet on things like KSM [1] to further improve
the memory situation.

For example, we are investigating its use in the large (read heavy)
application frameworks at CERN where the typical vmem footprint is
~2Gb.
Running KSM together with a multiprocessing-based event loop manager,
we
managed to overcommit ~300% of the memory (ie: run 3 instances of our
application on a 2Gb-per-core machine)

cheers,
sebastien

[1] http://lwn.net/Articles/306642


From jjposner at snet.net  Mon Feb 16 11:40:18 2009
From: jjposner at snet.net (John Posner)
Date: Mon, 16 Feb 2009 11:40:18 -0500
Subject: Changing the Image on a button
In-Reply-To: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
Message-ID: <40B38CF8ABFA49D297308E65A3426BD0@AMDUP>

 >> from Tkinter import *
 >> 
 >> def do():
 >>     btn.configure(image = None)
 >> 
 >> root = Tk()
 >> img1 = PhotoImage(file="bacon.gif")
 >> 
 >> btn = Button(image = img1, command = do, text = "hello" )
 >> btn.img = img1
 >> btn.pack()
 >> root.mainloop()
 >> 

Try this change:

  from: btn.configure(image = None)
    to: img1.blank()

-John







E-mail message checked by Spyware Doctor (6.0.0.386)
Database version: 5.11770
http://www.pctools.com/en/spyware-doctor-antivirus/


From rjohnson42 at gmail.com  Mon Feb 16 11:50:20 2009
From: rjohnson42 at gmail.com (Dick)
Date: Mon, 16 Feb 2009 08:50:20 -0800 (PST)
Subject: Windows vista
References: <c5a2b01c-2e31-43d6-bb11-41412d912e21@o40g2000prn.googlegroups.com>
Message-ID: <87e1d911-9d6a-4c0d-8f8a-0b66d3356408@l38g2000vba.googlegroups.com>

On Feb 16, 1:46?am, loveshadow... at yahoo.com wrote:
> Hi. My name is toru.
> I start learning python couple weeks ago.
>
> I install the compiler from python.org.
> but I cannot use the IDLE program.
> (command line works fine so far)
> the error screen says that the my personal fire wall is blocking the
> program to run.
> I am not sure how to fix this.
> By the way, I heard many people said that this is because I am using
> windows vista.
> Does anyone know how to use IDLE program on Windows Vista machine?
>
> thank you.

On my Vista machine I reply to a firewall popup the first time I run
IDLE and tell it to allow
IDLE to open a port. The next time I run IDLE, all is OK. I still have
the problem that
sometimes IDLE does not properly cleanup hung processes, which means
IDLE will not restart.

Dick Johnson


From benjamin at python.org  Mon Feb 16 11:54:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 16 Feb 2009 10:54:43 -0600
Subject: [Python-Dev] RELEASED Python 3.0.1
In-Reply-To: <nad-2D157E.19151715022009@news.gmane.org>
References: <DA195505-BDC0-4AF4-B707-4839BA87075B@python.org>
	<ec96e1390902132046k75fbaa12h7c54ab0f8f346bbe@mail.gmail.com>
	<nad-2D157E.19151715022009@news.gmane.org>
Message-ID: <1afaf6160902160854u6cf8c81ck219cbc7fddafdd3f@mail.gmail.com>

On Sun, Feb 15, 2009 at 9:15 PM, Ned Deily <nad at acm.org> wrote:
>
> It would be great if someone could add OS X links for the 3.0.1 and
> 2.6.1 to the main download page, too:
>   <http://www.python.org/download/>

I've now added them to the main download page.




-- 
Regards,
Benjamin


From bieffe62 at gmail.com  Mon Feb 16 11:56:08 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 16 Feb 2009 08:56:08 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
References: <mailman.49.1234792399.11746.python-list@python.org>
Message-ID: <9289e298-a123-47e9-855a-3df71d92e078@l1g2000yqj.googlegroups.com>

On 16 Feb, 14:47, Mamahita Sela <mamahitas... at yahoo.com> wrote:
> Dear All,
>
> I have read several howtos for threading in PyGTK. I have tried some but with no luck.
>
> What i want is: i can keep typing in gtk.TextView while periodically doing ping some hosts.
>
> I think, the thread part is working since i can ping so fast (even for not reply host, around 3 s for 27 no-reply-host). But, when the ping action is running, i can not typing in textview. What i type while pinging will show up after ping action is done.
>
> (I am using 2.5.1, pygtk 2.10.6 on Linux x86)
>
> This is my code:
> import threading
> import commands
> import gtk
> import gobject
>
> gtk.gdk.threads_init()
>
> class PingHost(threading.Thread):
> ? ? def __init__(self, host):
> ? ? ? ? threading.Thread.__init__(self)
> ? ? ? ? self.host = host
> ? ? ? ? self.result = ()
> ? ? def run(self):
> ? ? ? ? self.result = self.host, commands.getstatusoutput('ping %s -c1' %(self.host))[0]
>
> class Main:
> ? ? def __init__(self):
> ? ? ? ? self.win = gtk.Window()
> ? ? ? ? self.win.connect('destroy', gtk.main_quit)
> ? ? ? ? #
> ? ? ? ? self.textb = gtk.TextBuffer()
> ? ? ? ? self.textv = gtk.TextView(self.textb)
> ? ? ? ? self.textv.set_size_request(500, 500)
> ? ? ? ? #
> ? ? ? ? self.win.add(self.textv)
> ? ? ? ? self.win.show_all()
> ? ? ? ? #
> ? ? ? ? gobject.timeout_add(5000, self.do_ping)
>
> ? ? ? ? def do_ping(self):
> ? ? ? ? all_threads = []
> ? ? ? ? #
> ? ? ? ? for h in range(100, 105):
> ? ? ? ? ? ? host = '192.168.0.%d' %(h)
> ? ? ? ? ? ? #
> ? ? ? ? ? ? worker = PingHost(host)
> ? ? ? ? ? ? worker.start()
> ? ? ? ? ? ? all_threads.append(worker)
> ? ? ? ? #
> ? ? ? ? for t in all_threads:
> ? ? ? ? ? ? t.join()
> ? ? ? ? ? ? print t.result
> ? ? ? ? #
> ? ? ? ? return True
>
> if __name__ == '__main__':
> ? ? app = Main()
> ? ? gtk.main()
>
> Any help would be appreciated :)
> Best regards,
> M

As you have been already told, join() blocks until the thread is
terminated. and you should avoid that.
A simple fix could by add a timeout to t.join, doing something like :
        t.join(JOIN_TIMEOUT);
        if not t.isAlive():
            print t.result

Anywway, starting a thread for each ping is not very efficient, so you
could do better by having a 'ping server thread'
that repeatedly performs the following steps:
- accepts ping command on a queue.Queue
- ping the target and waits for the result
- publish the result on another queue.Queue

At this point, the do_ping action should:
  - send a ping command to the oping server
  - check (in non blocking mode) if there is any result on the ping
results queue
  - display the result, if any

Another big speedup would be to avoid spawning a subprocess fro each
ping and instead
using directly sockets to send ICMP packets, using recipes like this :

http://code.activestate.com/recipes/409689/

Ciao
------
FB


From me at gustavonarea.net  Mon Feb 16 11:58:25 2009
From: me at gustavonarea.net (Gustavo Narea)
Date: Mon, 16 Feb 2009 08:58:25 -0800 (PST)
Subject: Turning a signature-changing decorator into a 
	signature-preserving one
References: <6b0518e3-142c-4555-8ad0-02c559f6b224@u13g2000yqg.googlegroups.com>
	<6b0874ad-4c30-4b3f-a559-f83465d332da@z1g2000yqn.googlegroups.com> 
	<2610ff6e-d487-42e8-a619-aa4db6f9556f@h5g2000yqh.googlegroups.com> 
	<f4aa1ad5-e4ff-4ed2-9ff9-bad0ee471e79@w1g2000prm.googlegroups.com> 
	<a5d4d282-a0e0-4eef-b265-1d47462f961b@33g2000yqm.googlegroups.com> 
	<89d40e93-07b1-4761-9154-7c870981999c@v15g2000yqn.googlegroups.com> 
	<89bce53a-f5e9-4add-83f8-54522c900db6@n10g2000vbl.googlegroups.com> 
	<7845ce9e-5528-46fc-ab7d-1efc4df9009b@41g2000yqf.googlegroups.com> 
	<6a2018f2-cc90-443b-8021-c252095f4a2d@v42g2000yqj.googlegroups.com> 
	<2004688b-f3f1-4509-ac81-f3ae496547c1@t13g2000yqc.googlegroups.com> 
	<17034c1d-38d8-42c6-b331-826053cb1fd1@s36g2000vbp.googlegroups.com> 
	<13ae3295-912e-48a3-bd94-41186ff75b88@e18g2000vbe.googlegroups.com>
Message-ID: <ea4fd41c-ff61-4cf6-95ed-70e2d0195d4c@m42g2000yqb.googlegroups.com>

On Feb 16, 5:18 pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 4:59 pm, Gustavo Narea <m... at gustavonarea.net> wrote:
>
>
>
> > I've not seen anything special in Pylons or TurboGears 2 decorators,
> > except that they are all functions that use the decorator package --
> > while my decorator is a class that doesn't use the decorator package
> > yet.
>
> > My attempt to turn that decorator into a signature preserving one
> > using the decorator packages fails even on TurboGears 2. As of
> > decorator 3.0.1, I get this error:
> >     TypeError: You are decorating a non function: <unbound method
> > SecurePanel.__before__>
>
> > Isn't this caused by the fact that my decorator is a class, or the way
> > such a class is defined (whose code is in the first post of the
> > thread)? I can turn it into a function because I'm sure I'll work --
> > although I wanted a class to make it easier to customize.
>
> > Thanks.
>
> The decorator class is fine, the error in clearly in what you pass to
> the decorator.
> You are trying to decorate an unbound method SecurePanel.__before__:
> are you
> sure this is really what you want to decorate? Are you decorating
> automatically all methods
> of SecurePanel? I have already mentioned it, but you can extract the
> underlying function
> from the method by using  SecurePanel.__before__.im_func if you really
> want.

Thank you very much, it works with SecurePanel.__before__.im_func!


From deets at nospam.web.de  Mon Feb 16 12:07:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 18:07:12 +0100
Subject: logging and daemons
In-Reply-To: <mailman.42.1234789336.11746.python-list@python.org>
References: <mailman.42.1234789336.11746.python-list@python.org>
Message-ID: <6vtkq4FidfdeU1@mid.uni-berlin.de>

Fernando M. Maresca schrieb:
> Hello.
> 
> I'm in the process of replacing a custom logger class in one of my apps
> that has several daemons. In the last step of daemonizing a program,
> after closing fds, stderr and stdout are redirected to the logfile of
> the program.
> 
> Now, I'm trying to use TimedRotatingFileHandler as the only channel when
> the programs run in daemon mode. My problem is: I can't see a goog way
> to redirect stderr/stdout both to the logger.
> 
> Note that I don't have any print statements in any of my code, but I
> can't be sure about all the modules I'm importing, and I like to get any
> uncached exception info that may go to stderr/stdout to show up in the
> logfiles.

why don't you just replace the sys.stdout/sys.stdin objects with 
something that is file-like (supports a write-method, that should be 
enough in this case), and then simply write the data arriving to the 
logger instance of your trust.

If other modules don't get overly tricky to bypass sys.stdout, that 
should capture all you output, regardless of the file descriptor issues.

In the end, if a 3rd-party-module choses to open a filedescriptor itself 
& write to that, there is nothing you can do about that. But usually, 
they don't behave that way.

Diez


From vinay_sajip at yahoo.co.uk  Mon Feb 16 12:14:08 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Mon, 16 Feb 2009 09:14:08 -0800 (PST)
Subject: logging and daemons
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com> 
	<mailman.44.1234790124.11746.python-list@python.org>
Message-ID: <4aeaece7-a3ce-44e8-aa6f-c5d0165c109d@f20g2000yqg.googlegroups.com>

On Feb 16, 1:15 pm, "Fernando M. Maresca" <fmare... at gmail.com> wrote:
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler).

That's fine with a FileHandler, as long as you don't use e.g.
logrotate - that would cause the fd to change, too.

> I'm looking into this because I really need rotating, because when
> debugging is on, large amounts of data are logged, and because I like
> the logging module approach in every aspect.
>

You can capture the stuff written to std[out|err] using any file-like
object, so there are other options beyond redirecting to the fd of the
handler's fd or adding a write method to the logger. For example, if
you create a simple class which duck-types the file-like object, you
could create two instances, for stdout and stderr, and wire them into
sys. At any point you choose, you can choose to forward the
information collected to the log. Is all your stuff pure Python, or do
you have C extensions or subprocesses which are C-based? Also, I
assume you have a separate rotating log file per daemon - is that
right?

Regards,

Vinay Sajip



From Scott.Daniels at Acm.Org  Mon Feb 16 12:44:35 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 16 Feb 2009 09:44:35 -0800
Subject: Will multithreading make python less popular?
In-Reply-To: <mailman.45.1234790250.11746.python-list@python.org>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
Message-ID: <d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net>

andrew cooke wrote:
<The best short to the "GIL issue" that I have read in a long time>

Thanks a lot for writing this, I'll be pointing to it from time to time.
Were I writing such a thing I'd focus too much on the how (issues I know
that non-GIL true concurrency faces), and not enough on the high level
view.

Bravo.

--Scott David Daniels
Scott.Daniels at Acm.Org


From basilisk96 at gmail.com  Mon Feb 16 12:45:54 2009
From: basilisk96 at gmail.com (Basilisk96)
Date: Mon, 16 Feb 2009 09:45:54 -0800 (PST)
Subject: how can this iterator be optimized?
References: <727aabd1-9682-47aa-88e2-5dde96e4c32e@j1g2000yqi.googlegroups.com>
	<2b4e62a9-efa8-4656-98e4-4755a10e7cac@v5g2000pre.googlegroups.com>
Message-ID: <1bd69222-6b94-42f6-ab52-844043b25ffa@q25g2000vbn.googlegroups.com>

On Feb 14, 10:19?am, Paul McGuire <pt... at austin.rr.com> wrote:
> If func is expensive, you could try memoizing it. ?Then subsequent
> "calls" just do arg lookups. ?Michele Simianato has posted a good
> memoizing decorator on the Python wiki.
>
> -- Paul

That's the trick! I almost forgot about that one. Thanks!
-Basilisk96


From ts8807385 at gmail.com  Mon Feb 16 12:55:41 2009
From: ts8807385 at gmail.com (ts8807385 at gmail.com)
Date: Mon, 16 Feb 2009 09:55:41 -0800 (PST)
Subject: chi squared (X2) in Python
Message-ID: <7f4eff87-20e2-47b4-b5e2-1c62aebd8bbc@w34g2000yqm.googlegroups.com>

I was wondering if anyone has done this in Python. I wrote two
functions that do it (I think... see below), but I do not understand
how to interpret the results. I'm doing an experiment to implement ent
in Python. ent tests the randomness of files and chi squared is
probably the best test for this purposes when compared to other tests.
Many of the statistical tests are easy (like Arithmetic Mean, etc) and
I have no problems interpreting the results from those, but chi
squared has stumped me. Here are my two simple functions, run them if
you like to better understand the output:

import os
import os.path

def observed(f):

    # argument f is a filepath/filename
    #
    # Return a list of observed characters in decimal ord(char).
    # Decimal value of characters may be 0 through 255.
    # [43, 54, 0, 255, 4, etc.]

    chars = []
    #print f

    fd = open(f, 'rb')
    bytes = fd.read(13312)
    fd.close()

    for byte in bytes:
        chars.append(ord(byte))

    #print chars

    if len(chars) != 13312:
        print "Wait... chars does not equal 13312 in observed!!!"
        return None
    else:
        return chars

def chi(char_list):

    # Expected frequency of characters. I arrived at this like so:
    # expected = number of observations/number of possibilities
    # 52 = 13312/256

    expected = 52.0

    print "observed\texpected\tx2"

    # 0 - 255
    for x in range(0,256):
        observed = 0
        for char in char_list:
            if x == char:
                observed +=1

        # The three chi squared calculations
        # one = observed - expected
        # two = one squared
        # x2 = two/expected

        # x2 = (observed - expected) squared
        #       ----------------------------
        #                expected

        one = observed - expected
        two = one * one
        x2 = two/expected

        print observed, "\t", expected, "\t", x2


chi(observed("filepath"))

The output looks similar to this:

observed	expected	x2
62 	52.0 	1.92307692308
46 	52.0 	0.692307692308
60 	52.0 	1.23076923077
68 	52.0 	4.92307692308

I know this is a bit off-topic here, just hoping someone could help me
interpret the x2 variable. After that, I'll be OK. I need to sum up
things to get an overall x2 for the bytes I've read, but before doing
that, I wanted to post this note. Please feel free to comment on any
aspect of this. If I've got something entirely wrong, let me know.
BTW, I selected 13KB (13,312) as it seems to be efficient and a decent
size to test, the data could be any amount (up to and including the
whole file) above this.

Thanks,

Tiff



From mal at egenix.com  Mon Feb 16 13:05:37 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Mon, 16 Feb 2009 19:05:37 +0100
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <4999AAF1.5000206@egenix.com>

On 2009-02-12 18:38, Travis wrote:
> So,
> 
> Recently I made a fix to the zlib module that I need for use at work.
> 
> I would like other employees to be able to use it without recompiling python.
> 
> I assume I can just rename it and distribute it as a python extension.
> 
> I was wondering how I can provide a way for other employees to build it.
> 
> I saw a "Universal Unix Makefile for Python extensions" that looks promising.
> 
> Is this the accepted way to compile python extensions still?

Not really. That approach was abandoned years ago in favor of a
distutils approach:

http://docs.python.org/distutils/index.html

in particular:

http://docs.python.org/distutils/setupscript.html#describing-extension-modules

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 16 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From Nicolas.Dandrimont at crans.org  Mon Feb 16 13:09:28 2009
From: Nicolas.Dandrimont at crans.org (Nicolas Dandrimont)
Date: Mon, 16 Feb 2009 13:09:28 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <1234763314.25586.1300573535@webmail.messagingengine.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
	<1234763314.25586.1300573535@webmail.messagingengine.com>
Message-ID: <20090216180928.GA14441@dirichlet.crans.org>

* python at bdurham.com <python at bdurham.com> [2009-02-16 00:48:34 -0500]:

> Nicolas,
> 
> > I would go for something like:
> > 
> > for char in word:
> >     if char in 'aeiouAEIUO':
> >         char_found = True
> >         break
> > else:
> >     char_found = False
> >
> > It is clear (imo), and it is seems to be the intended idiom for a 
> > search loop, that short-circuits as soon as a match is found.
> 
> Thank you - that looks much better that my overly complicated attempts.
> 
> Are there any reasons why I couldn't simplify your approach as follows?
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         return True
> return False

If you want to put this in its own function, this seems to be the way to go.

Cheers,
-- 
Nicolas Dandrimont

The nice thing about Windows is - It does not just crash, it displays a
dialog box and lets you press 'OK' first.
(Arno Schaefer's .sig)
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From robert.kern at gmail.com  Mon Feb 16 13:09:34 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 16 Feb 2009 12:09:34 -0600
Subject: how to distribute python extensions independently of python
In-Reply-To: <20090212173812.GH6522@subspacefield.org>
References: <20090212173812.GH6522@subspacefield.org>
Message-ID: <gnca4u$13u$1@ger.gmane.org>

On 2009-02-12 11:38, Travis wrote:
> So,
>
> Recently I made a fix to the zlib module that I need for use at work.

Would you mind contributing this fix back to Python?

   http://bugs.python.org/

If you don't want to go to the effort of making a patch, at least a description 
of the problem you encountered and a description of your fix would be helpful.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Scott.Daniels at Acm.Org  Mon Feb 16 13:11:51 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 16 Feb 2009 10:11:51 -0800
Subject: logging and daemons
In-Reply-To: <mailman.44.1234790124.11746.python-list@python.org>
References: <20090216130206.GA20397@gmail.com>	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<mailman.44.1234790124.11746.python-list@python.org>
Message-ID: <34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>

Fernando M. Maresca wrote:
  On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>> You can actually set sys.std[err|out] to your ?file? descriptor of
>> choice in python ....
> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
> fd of the logfile change in every rotation of the logfile. So the direct
> approach of std[out|err] redirection to the logfile fd obtained from
> the logger instance is unusable (it works fine with a simple file
> handler). 

Right, so you stick something in as stderr/stdout that talks to the
logfile.  That is, something like:

     import sys

     class MyFakeStdout(object):
         def flush(self):
             pass
         def write(self, text):
             <code to actually do the logging>
     sys.stderr = sys.stdout = MyFakeStdout()


--Scott David Daniels
Scott.Daniels at Acm.Org


From bedouglas at earthlink.net  Mon Feb 16 13:25:52 2009
From: bedouglas at earthlink.net (bruce)
Date: Mon, 16 Feb 2009 10:25:52 -0800
Subject: pythojn/xpath question...
Message-ID: <445301c99064$00c80e50$0301a8c0@tmesa.com>

hi...

using libxml2dom as the xpath lib

i've got a situation where i can have:
 foo=a.xpath( /html/body/table[2]/tr[45]/td)
and i can get
 11 as the number of returned td elements for the 45th row...

this is as it should be.

however, if i do:
 foo=a.xpath( /html/body/table[2]/tr)

and then try to iterate through to the 45th "tr", and try to get the number
of "td" elements..
i can't seem to get the additional xpath that has to be used,

i've tried a number of the following with no luck...
  l1 = libxml2dom.toString(tmp_[0])
  print "l1 = "+l1+"\n"

  ldx = 0
  for l in tmp_:
    print "ld ="+str(ldx)
    if ldx==45:
      #needs to be a better way...
      #l1 = libxml2dom.toString(tmp_[0])
      l1 = libxml2dom.toString(l)
      #print "1111 = ",l1

      q1 = libxml2dom
      b1 = q1.parseString(l1, html=1)
      #dd1 = b1.xpath("//td[not(@width)]")
      #data = b1.xpath("//td/font")
      #data = b1.xpath("//td[@valign='top'][not(@width)]")
      #data =
b1.xpath("//child::td[position()>0][@valign='top'][not(@width)]")
      #data = b1.xpath("//td/parent::*/td[@valign='top'][not(@width)]")
      #data = b1.xpath("//td[position()]")
      #data = b1.xpath("//parent::tr[position()=1]/td")
      data = b1.xpath("//td[@valign='top'][not(@width)]")


it appears that i somehow need to get the direct child/node of the parent
"tr" that's the "td"...
it looks like using ("//td..." gets all the underlying child "td"... as
opposed to the direct
1st level child/siblings... any thoughts/pointers would be appreciated...

thanks...




From jcd at sdf.lonestar.org  Mon Feb 16 13:34:17 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 13:34:17 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <20090216052846.GA12723@dirichlet.crans.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<20090216052846.GA12723@dirichlet.crans.org>
Message-ID: <1234809257.26675.14.camel@aalcdl07.lib.unc.edu>


On Mon, 2009-02-16 at 00:28 -0500, Nicolas Dandrimont wrote:
> * python at bdurham.com <python at bdurham.com> [2009-02-16 00:17:37 -0500]:
> 
> > I need to test strings to determine if one of a list of chars is
> > in the string. A simple example would be to test strings to
> > determine if they have a vowel (aeiouAEIOU) present.
> > I was hopeful that there was a built-in method that operated
> > similar to startswith where I could pass a tuple of chars to be
> > tested, but I could not find such a method.
> > Which of the following techniques is most Pythonic or are there
> > better ways to perform this type of match?
> > # long and hard coded but short circuits as soon as match found
> > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or
> > ... :
> > -OR-
> > # flexible, but no short circuit on first match
> > if [ char for char in word if char in 'aeiouAEIOU' ]:
> > -OR-
> > # flexible, but no short circuit on first match
> > if set( word ).intersection( 'aeiouAEIOU' ):
> 
> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
> 
> (No, I did not forget to indent the else statement, see
> http://docs.python.org/reference/compound_stmts.html#for)
> 
> It is clear (imo), and it is seems to be the intended idiom for a search
> loop, that short-circuits as soon as a match is found.
> 

If performance becomes an issue, you can tune this very easily, so it
doesn't have to scan through the string 'aeiouAEIOU' every time, by
making a set out of that:

vowels = set('aeiouAEIOU')
for char in word 
    if char in vowels:
        return True
return False

Searching in a set runs in constant time.  


> Cheers,
> --
> http://mail.python.org/mailman/listinfo/python-list



From laplacian42 at gmail.com  Mon Feb 16 13:43:12 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 10:43:12 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
Message-ID: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>

On Feb 16, 2:34?am, Python Nutter <pythonnut... at gmail.com> wrote:
> Had a look and it is still under my radar unfortunately because of
> TkInter. OceanGUI

Note: spelling is "OcempGUI". Also, since google broke some of the
links,
here's that main link again:

http://ocemp.sourceforge.net/gui.html

> has a lot of large decencies (Pygame, SDL libraries,
> PyObjC, etc.) to install on my system

Well, to be fair, SDL is pretty commonly-used software and they offer
binary downloads for Mac OS X and MS Windows. Pygame seems to provide
the same. So, installation should be a breeze.

> to just to get a GUI thats no
> better loking than TkInter which comes pre-installed (no dependencies)
> on most every major platform.

Well, of course, there *is* a dependency: you need Tcl/Tk installed.

> If I was writing a game I might be interested, but I'd want to do some
> serious skinning of that GUI to make it look better.

I suppose so, but the point of my post was that by default it makes
quite a nice GUI toolkit.

> For applications installing the full wxWidgets or Qt toolkits would be
> less disk space and dependcies than OceanGUI

What? Qt and wX are *huge* compared to OcempGUI.

> and performance would
> probably be higher.

Probably, but wX and Qt are written in C++. OcempGUI is pure Python,
which would make it easier for the Python community to help extend,
optimize, and maintain.

> TkInter also has many skins/themes you can add
> that makes it rather, although not 100% native looking on target
> systems.

OcempGUI can also be "themed" as well. Though I'm not sure how much is
out there yet.


From dotancohen at gmail.com  Mon Feb 16 13:52:41 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 20:52:41 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <880dece00902161052j12cd2a64m3108ecd47c2bbbbe@mail.gmail.com>

>> For applications installing the full wxWidgets or Qt toolkits would be
>> less disk space and dependcies than OceanGUI
>
> What? Qt and wX are *huge* compared to OcempGUI.
>

Don't forget that many people will already have Qt already installed,
such as KDE users, or those who use Skype, Google Earth, or Opera.
Though KDE's Qt will likely be accessibily installed in a convinient
place, though, I'm not so sure about those other examples.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From vedrandekovic at gmail.com  Mon Feb 16 13:58:27 2009
From: vedrandekovic at gmail.com (vedrandekovic at gmail.com)
Date: Mon, 16 Feb 2009 10:58:27 -0800 (PST)
Subject: wxPython and Croatian characters
Message-ID: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>

Hello,

I have problem with configuring my wxPython script to work with
Croatian characters like:  ?,?,?,?,?.
Here is my simple script without wxPython (this script works):

      # -*- coding: utf-8 -*-
      s = "hello normal string ?????"
      print s

..here is my snippet with wxPython:

    text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
example,we have character "?"

...when I run this text, it looks something like:  "Mati",some weird
characters ,and "ni"

Regards,
John


From deets at nospam.web.de  Mon Feb 16 14:03:45 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 20:03:45 +0100
Subject: pythojn/xpath question...
In-Reply-To: <mailman.63.1234808761.11746.python-list@python.org>
References: <mailman.63.1234808761.11746.python-list@python.org>
Message-ID: <6vtrkiFltc8eU1@mid.uni-berlin.de>

bruce schrieb:
> hi...
> 
> using libxml2dom as the xpath lib
> 
> i've got a situation where i can have:
>  foo=a.xpath( /html/body/table[2]/tr[45]/td)
> and i can get
>  11 as the number of returned td elements for the 45th row...
> 
> this is as it should be.
> 
> however, if i do:
>  foo=a.xpath( /html/body/table[2]/tr)
> 
> and then try to iterate through to the 45th "tr", and try to get the number
> of "td" elements..
> i can't seem to get the additional xpath that has to be used,
> 
> i've tried a number of the following with no luck...
>   l1 = libxml2dom.toString(tmp_[0])
>   print "l1 = "+l1+"\n"
> 
>   ldx = 0
>   for l in tmp_:
>     print "ld ="+str(ldx)
>     if ldx==45:
>       #needs to be a better way...
>       #l1 = libxml2dom.toString(tmp_[0])
>       l1 = libxml2dom.toString(l)
>       #print "1111 = ",l1
> 
>       q1 = libxml2dom
>       b1 = q1.parseString(l1, html=1)
>       #dd1 = b1.xpath("//td[not(@width)]")
>       #data = b1.xpath("//td/font")
>       #data = b1.xpath("//td[@valign='top'][not(@width)]")
>       #data =
> b1.xpath("//child::td[position()>0][@valign='top'][not(@width)]")
>       #data = b1.xpath("//td/parent::*/td[@valign='top'][not(@width)]")
>       #data = b1.xpath("//td[position()]")
>       #data = b1.xpath("//parent::tr[position()=1]/td")
>       data = b1.xpath("//td[@valign='top'][not(@width)]")
> 
> 
> it appears that i somehow need to get the direct child/node of the parent
> "tr" that's the "td"...
> it looks like using ("//td..." gets all the underlying child "td"... as
> opposed to the direct
> 1st level child/siblings... any thoughts/pointers would be appreciated...

  - you don't give enough information, as you don't provide the html
  - the above code is obviously not the one running, as I can't see 
anything that's increasing your running variable ldx
  - using l as variable names is extremely confusing, because it's hard 
to distinguish from 1 (the number). Using l1 is even worse.
  - xpath usually counts from 1, whereas python is 0-based. As is your 
code. So you most probably have a off-by-one-error.
  - you should read a xpath-tutorial, as "//td"'s purpose is to fetch 
*all*  elements td from the document root, as it is clearly stated here: 
http://www.w3.org/TR/xpath#path-abbrev. So it's no wonder you get more 
than you expect. Direct child nodes are found by simply omitting the 
axis specifier.

Diez



From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 16 14:04:59 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 16 Feb 2009 20:04:59 +0100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
	<00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
Message-ID: <4999c674$0$10270$426a74cc@news.free.fr>

laplacian42 at gmail.com a ?crit :
> On Feb 16, 1:52 pm, Dotan Cohen <dotanco... at gmail.com> wrote:
>> Don't forget that many people will already have Qt already installed,
>> such as KDE users, or those who use Skype, Google Earth, or Opera.
>> Though KDE's Qt will likely be accessibily installed in a convinient
>> place, though, I'm not so sure about those other examples.
>>
> 
> Well, yes. KDE users will already have Qt installed (and maybe PyQt)
> but may groan at the prospect of having to install GTK+ and PyGTK.
> Gnome users will already have GTK+ installed (and maybe PyGTK),  but
> may groan at having to install Qt and PyQt.  However, both will likely
> have no qualms about installing SDL and Pygame (which are pretty small
> and also allow them to play various games as well).

FWIW (and servers set aside, of course), I can hardly remember of any of 
linux box I worked one not having both GTK and KDE installed.


From deets at nospam.web.de  Mon Feb 16 14:06:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 16 Feb 2009 20:06:53 +0100
Subject: wxPython and Croatian characters
In-Reply-To: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
Message-ID: <6vtrqdFltc8eU2@mid.uni-berlin.de>

vedrandekovic at gmail.com schrieb:
> Hello,
> 
> I have problem with configuring my wxPython script to work with
> Croatian characters like:  ?,?,?,?,?.
> Here is my simple script without wxPython (this script works):
> 
>       # -*- coding: utf-8 -*-
>       s = "hello normal string ?????"
>       print s
> 
> ..here is my snippet with wxPython:
> 
>     text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> example,we have character "?"
> 
> ...when I run this text, it looks something like:  "Mati",some weird
> characters ,and "ni"

Unless you are using python 3.0 (which I doubt, afaik no wx available), 
your above coding declaration is useless for the shown piece of code, as 
it only applies to unicode literals, which are written with a preceding u.

So

u"m?nsch ist doch nicht so schwer"


gives you an unicode literal, that wx might work with (don't know wx)

And of course you need to make sure your editor produces utf-8 as 
output, otherwise the exercise is futile as well.

Diez


From regebro at gmail.com  Mon Feb 16 14:08:19 2009
From: regebro at gmail.com (Lennart Regebro)
Date: Mon, 16 Feb 2009 20:08:19 +0100
Subject: To 3.0.2 or not to 3.0.2?
Message-ID: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>

I discovered some remaining cmp() in 3.0.1, 38 minutes after Benjamin
fixed them. :) Unfortunately, that means porting setuptools to 3.0.1
will be a bit difficult. So my question is: Will there be a 3.0.2 with
those fixes, or should I add workaround code for 3.0.1?

-- 
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 16 14:11:04 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 16 Feb 2009 20:11:04 +0100
Subject: illegal list name
In-Reply-To: <mailman.6.1234743905.11746.python-list@python.org>
References: <mailman.6.1234743905.11746.python-list@python.org>
Message-ID: <4999c7e0$0$4785$426a74cc@news.free.fr>

Sandra Quiles a ?crit :

> Hello. I have followed the instructions of a post on Installing mailman 
> on OS X 10.4, and got to step 7 and hit this error.
> 
(snip)
> So. illegal name error. it list listname as 'mailman@<mycomputername>'
> 
> that's in response to the 'bin/newlist mailman' command

Sorry, this has nothing to do with Python. Please refer to mailman's 
documentation, mailing list or whatever.

> also, I purchased the Postfix Enabler, but have no clue what to do with 
> the software.

Nor do I.

> Tips, advise, hand-holding welcomed.

Start here:
http://catb.org/~esr/faqs/smart-questions.html


HTH


From laplacian42 at gmail.com  Mon Feb 16 14:16:39 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 11:16:39 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
Message-ID: <00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>

On Feb 16, 1:52?pm, Dotan Cohen <dotanco... at gmail.com> wrote:
>
> Don't forget that many people will already have Qt already installed,
> such as KDE users, or those who use Skype, Google Earth, or Opera.
> Though KDE's Qt will likely be accessibily installed in a convinient
> place, though, I'm not so sure about those other examples.
>

Well, yes. KDE users will already have Qt installed (and maybe PyQt)
but may groan at the prospect of having to install GTK+ and PyGTK.
Gnome users will already have GTK+ installed (and maybe PyGTK), but
may groan at having to install Qt and PyQt. However, both will likely
have no qualms about installing SDL and Pygame (which are pretty small
and also allow them to play various games as well).


From fmaresca at gmail.com  Mon Feb 16 14:19:35 2009
From: fmaresca at gmail.com (Fernando M. Maresca)
Date: Mon, 16 Feb 2009 17:19:35 -0200
Subject: logging and daemons
In-Reply-To: <34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>
References: <20090216130206.GA20397@gmail.com>
	<364299f40902160507g4eca4be2yda535199451ce5a8@mail.gmail.com>
	<mailman.44.1234790124.11746.python-list@python.org>
	<34idnSxjvpdDNgTUnZ2dnUVZ_haWnZ2d@pdx.net>
Message-ID: <20090216191935.GA11254@gmail.com>

On Mon, Feb 16, 2009 at 10:11:51AM -0800, Scott David Daniels wrote:
> Fernando M. Maresca wrote:
>  On Mon, Feb 16, 2009 at 05:07:45AM -0800, Garrett Cooper wrote:
>>> You can actually set sys.std[err|out] to your ?file? descriptor of
>>> choice in python ....
>> Yes, but I'm trying to use *TimedRotating*FileHandler, which makes the
>> fd of the logfile change in every rotation of the logfile. So the direct
>> approach of std[out|err] redirection to the logfile fd obtained from
>> the logger instance is unusable (it works fine with a simple file
>> handler). 
>
> Right, so you stick something in as stderr/stdout that talks to the
> logfile.  That is, something like:
>
>     import sys
>
>     class MyFakeStdout(object):
>         def flush(self):
>             pass
>         def write(self, text):
>             <code to actually do the logging>
>     sys.stderr = sys.stdout = MyFakeStdout()
>
Thanks a lot for the input.
That's pretty much what I'm doing right now, just wondered if were a
cleanest way.

Cheers,

-- 
Fernando
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From stefaan.himpe at gmail.com  Mon Feb 16 14:44:55 2009
From: stefaan.himpe at gmail.com (Stefaan Himpe)
Date: Mon, 16 Feb 2009 20:44:55 +0100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <mailman.16.1234763316.11746.python-list@python.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<20090216052846.GA12723@dirichlet.crans.org>
	<mailman.16.1234763316.11746.python-list@python.org>
Message-ID: <Xmjml.667$Hk2.138@newsfe22.ams2>

An entirely different approach would be to use a regular expression:

import re
if re.search("[abc]", "nothing expekted"):
    print "a, b or c occurs in the string 'nothing expekted'"

if re.search("[abc]", "something expected"):
    print "a, b or c occurs in the string 'something expected'"

Best regards,
Stefaan.


From steve at holdenweb.com  Mon Feb 16 14:45:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 16 Feb 2009 14:45:21 -0500
Subject: replace ftp by local copy
In-Reply-To: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>
References: <2f223a64-4459-4905-b44a-07da12048895@c12g2000yqj.googlegroups.com>
Message-ID: <gncfog$k1v$1@ger.gmane.org>

loial wrote:
> I have been given an old python application that calls ftplib in many
> places to copy files to a remote server.
> 
> I have been given the task of cloneing this code so that ftp is not
> used, but files are just copied locally in a scenerio where ftp is not
> available. The code is not well structured which makes this more
> difficult.
> 
> Before starting this just wondered if anyone has previously done
> anything like overriding the ftplib module so that I can leave the
> existing code largely unchanged but have the ftp commands just copy
> files locally?
> 
> Just thought I'd ask before getting started.
> 
I don't remember anyone mentioning this, but it sounds like the soundest
engineering approach, and the one least likely to induce breakage ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From hniksic at xemacs.org  Mon Feb 16 14:48:02 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 16 Feb 2009 20:48:02 +0100
Subject: Easier to wrap C or C++ libraries?
References: <7baacd31-58c8-4e11-b25a-f827cc63d6ac@e18g2000yqo.googlegroups.com>
	<6vocf5Fkv5a9U1@mid.uni-berlin.de>
	<87vdrciysm.fsf@mulj.homelinux.net>
	<mailman.9545.1234642143.3487.python-list@python.org>
	<slrngpgdb7.ug6.nick@irishsea.home.craig-wood.com>
Message-ID: <87d4dii2od.fsf@mulj.homelinux.net>

Nick Craig-Wood <nick at craig-wood.com> writes:

> Christian Heimes <lists at cheimes.de> wrote:
>>  Hrvoje Niksic schrieb:
>> > "Diez B. Roggisch" <deets at nospam.web.de> writes:
>> > 
>> >> The answer is easy: if you use C, you can use ctypes to create a
>> >> wrapper - with pure python, no compilation, no platform issues.
>> > 
>> > The last part is not true.  ctypes doesn't work on 64-bit
>> > architectures, nor does it work when Python is built with non-gcc Unix
>> > compilers
>> 
>>  ctypes works on 64bit systems, too. However it's a pain in the ... back
>>  to write code with ctypes that works across all platforms. I used to use
>>  ctypes for wrapper but eventually I switched to Cython.
>
> What sort of problems have you had?
>
> I find as long as I use the same types as the C code actually uses it
> all works fine.  If on a 64 bit platform long is 64 bits then it will
> be under ctypes too.

I apologize for the misinformation that ctypes doesn't work on 64-bit
systems.  The project I'm working on doesn't include ctypes, but it
could be because we don't use GCC to build, or because we also need to
support Win64.


From santosdosreis at gmail.com  Mon Feb 16 14:52:56 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 11:52:56 -0800 (PST)
Subject: Speedup Bitmap Parser
Message-ID: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>

Hello people, I'm writing a Bitmap parser for study purposes, however
when I parse a bitmap file and when I paint that file in a window, the
script take to much time.
How can I optimize my script loops to be faster ?

Here is the script

http://pastebin.com/m652b8d65

Best Regards
Jayson Reis


From Olivier.Darge at gmail.com  Mon Feb 16 15:10:22 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Mon, 16 Feb 2009 12:10:22 -0800 (PST)
Subject: flexible find and replace ?
Message-ID: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>

Hi guys,

how would you do a clever find and replace, where the value replacing
the tag
is changing on each occurence ?

".......TAG............TAG................TAG..........TAG....."

is replaced by this :

".......REPL01............REPL02................REPL03..........REPL04..."


A better and clever method than this snippet should exist I hope :

counter = 1
while 'TAG' in mystring:
    mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
    counter+=1
    ...

(the find is always re-starting at the string beginning, this is not
efficient.

any ideas ? thanks,

Olivier


From dotancohen at gmail.com  Mon Feb 16 15:19:25 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 22:19:25 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <4999c674$0$10270$426a74cc@news.free.fr>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.65.1234810366.11746.python-list@python.org>
	<00b55f86-c0ae-4611-972e-9bdb899efd44@l1g2000yqj.googlegroups.com>
	<4999c674$0$10270$426a74cc@news.free.fr>
Message-ID: <880dece00902161219h482ba846q42b9e4ec478facab@mail.gmail.com>

> FWIW (and servers set aside, of course), I can hardly remember of any of
> linux box I worked one not having both GTK and KDE installed.

I don't think that those netbooks come with Qt. And for a Windows
installer, where one may want to package the toolkit with the program,
a small toolkit may be nice. There is such an issue today on the Zim
list, where including GTK in the installer bloated it to four times
it's size.

So it may be more of a download size for Windows users, than an
installed size for Linux users (disk space is cheap, at least with
traditional rotating hard drives).

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From bearophileHUGS at lycos.com  Mon Feb 16 15:22:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 12:22:40 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <b7ab697d-6a7e-4be6-8413-d88e19165768@f3g2000yqf.googlegroups.com>

OdarR:

> how would you do a clever find and replace, where the value replacing
> the tag is changing on each occurence ?
> ".......TAG............TAG................TAG..........TAG....."
> is replaced by this :
> ".......REPL01............REPL02................REPL03..........REPL04..."


You may use something like this (tested) replacing XXXXXXXXXXXX with
the correct re function:

import re

def replacer(mobj):
    replacer.counter += 1
    return "REPL%02d" % replacer.counter
replacer.counter = 0

print re.XXXXXXXXXXXX("TAG", replacer, s1)

(If you have more than 99 replacements it will use more than two
digits.)

Bye,
bearophile


From jason.scheirer at gmail.com  Mon Feb 16 15:27:54 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 16 Feb 2009 12:27:54 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <4a46c0dc-e78c-4bf0-8b6f-e80964ce4205@o40g2000prn.googlegroups.com>

On Feb 16, 12:10?pm, OdarR <Olivier.Da... at gmail.com> wrote:
> Hi guys,
>
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
>
> ".......TAG............TAG................TAG..........TAG....."
>
> is replaced by this :
>
> ".......REPL01............REPL02................REPL03..........REPL04..."
>
> A better and clever method than this snippet should exist I hope :
>
> counter = 1
> while 'TAG' in mystring:
> ? ? mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
> ? ? counter+=1
> ? ? ...
>
> (the find is always re-starting at the string beginning, this is not
> efficient.
>
> any ideas ? thanks,
>
> Olivier

You could split on the string and interleave your new string in
between:

In [1]: def replmaker():
   ...:     index = 0
   ...:     while True:
   ...:         index += 1
   ...:         yield "REPL%02i"%index
   ...:

In [2]: def spliton(string, tag="TAG", sepgen=replmaker):
   ...:     repl_iter = sepgen()
   ...:     strlist = string.split(tag)
   ...:     length = len(strlist)
   ...:     for index, item in enumerate(strlist):
   ...:         yield item
   ...:         if index < length - 1:
   ...:             yield repl_iter.next()
   ...:

In [3]: ''.join(spliton
(".......TAG............TAG................TAG..........TAG....." ))
Out[3]:
'.......REPL01............REPL02................REPL03..........REPL04.....'


From jason.scheirer at gmail.com  Mon Feb 16 15:32:39 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Mon, 16 Feb 2009 12:32:39 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
Message-ID: <14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com>

On Feb 16, 10:58?am, vedrandeko... at gmail.com wrote:
> Hello,
>
> I have problem with configuring my wxPython script to work with
> Croatian characters like: ??,?,?,?,?.
> Here is my simple script without wxPython (this script works):
>
> ? ? ? # -*- coding: utf-8 -*-
> ? ? ? s = "hello normal string ?????"
> ? ? ? print s
>
> ..here is my snippet with wxPython:
>
> ? ? text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> example,we have character "?"
>
> ...when I run this text, it looks something like: ?"Mati",some weird
> characters ,and "ni"
>
> Regards,
> John

You may be using an ANSI build of wxWidgets instead of a unicode one.
Make sure to enable Unicode when you run ./configure, or if in
Windows, uninstall and download the win32-unicode version of the
wxPython you want.


From tjreedy at udel.edu  Mon Feb 16 15:37:24 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 15:37:24 -0500
Subject: explain
In-Reply-To: <20090216102613.GE39358@nexus.in-nomine.org>
References: <654311.52341.qm@web111202.mail.gq1.yahoo.com>
	<20090216102613.GE39358@nexus.in-nomine.org>
Message-ID: <gnciq1$1l9$1@ger.gmane.org>

Jeroen Ruigrok van der Werven wrote:
> -On [20090216 11:17], Saeed Iravani (si.422a at yahoo.com) wrote:
>> I download python 2.5.4 and install but I dont know that how perform python?
>> I dont know from which directory perform python?
> 
> It would help if you would clarify which operating system you are using.
> 
> On Unix/Linux systems you make sure to 'rehash' your $PATH or add the
> appropriate directory to the $PATH variable.
> 
> On Windows, you set your environment variable PATH to include the path to
> Python programs (typically something like C:\Python25), which you can find
> under the system control panel.

On windows, that is not necessary for many uses.  Just use the entries 
in the start menu.




From tjreedy at udel.edu  Mon Feb 16 15:42:22 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 15:42:22 -0500
Subject: Creating custom formatter function
In-Reply-To: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>
References: <364299f40902160350n8583e88o20f7799eca3934b6@mail.gmail.com>
Message-ID: <gncj3b$1l9$2@ger.gmane.org>

Garrett Cooper wrote:
> Hello Python folks,
>     I have a function where I'd like to prefix a format string via a
> `prefix' string. The definition of the base method is as follows:
> 
> #START CODE
> def print_message(prefix, out_stream, fmt, *args, **kwargs):
>     """ Print out [prefix]: [message] """
> 
>     message = fmt
> 
>     if 0 < len(kwargs.keys()):
>         message = message % kwargs
> 
>     if 0 < len(args):

To clarify error message, "print fmt, message, args" here

>         message = message % args

This line

> 
>     out_stream.write(message + "\n")
> #END CODE
> 
>     My python 2.4.5 interpreter fails at `message % args' claiming the
> following:
> 
>   File "logging.py", line 10, in print_message
>     message = message % (args)

does not quite match this one, so one is not copy/pasted.

> TypeError: not all arguments converted during string formatting
> 
>     Thus I was wondering what the proper means was for formatting
> strings. I'm new to this portion of Python, so I obviously didn't
> apply the right syntax.
> TIA!
> -Garrett
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From tjreedy at udel.edu  Mon Feb 16 16:15:42 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 16 Feb 2009 16:15:42 -0500
Subject: Speedup Bitmap Parser
In-Reply-To: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
Message-ID: <gncl1s$cfp$1@ger.gmane.org>

Jayson Santos wrote:
> Hello people, I'm writing a Bitmap parser for study purposes, however
> when I parse a bitmap file and when I paint that file in a window, the
> script take to much time.

1. You turned constants into static methods called for every line, 
adding attribute lookup and function call time.
2. You read the image a line at a time and break each line into separate 
pixel objects.
3. You paint each pixel by drawing and filling a 1-pixel rectangle.

> How can I optimize my script loops to be faster ?

Don't do any of the above.  Look at how other programs such as PIL or 
pygame read, store, and paint images.

> Here is the script
> http://pastebin.com/m652b8d65

tjr



From rushenaly at gmail.com  Mon Feb 16 16:20:11 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Mon, 16 Feb 2009 13:20:11 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
	<d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net>
Message-ID: <f78c8501-f4ca-4d82-8210-44279d17d294@w34g2000yqm.googlegroups.com>

Hi again

OpenERP and ERP5 was written in python as i know. I really wonder how
they do this without threads. I want to see a real time graph at the
same time while i am working on the same screen. What is the secret?

Thanks
Rushen


From shreyas22 at gmail.com  Mon Feb 16 16:27:14 2009
From: shreyas22 at gmail.com (shreyas shah)
Date: Mon, 16 Feb 2009 16:27:14 -0500
Subject: Regarding Joystick
In-Reply-To: <3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>
References: <aa2d99d40902110826yb06d301vac75e785099af2d5@mail.gmail.com>
	<aa2d99d40902121403q11e8db7exff0bd59283060f20@mail.gmail.com>
	<3de8e1f70902122036i2fc88f85h351370a9ddaababb@mail.gmail.com>
Message-ID: <aa2d99d40902161327p7e2d38b5ua291c3b8475d4159@mail.gmail.com>

Hi ,

I have figured out a code with the help of archives in pygame ....

can anyone help me with controlling the speed of joystick ... i am going to
integrate joystick with a PTZ camera ... i was wondering if there are any
functions which can help me control the speed of camera and by controlling
motion of joystick


#! /usr/bin/env python

import pygame
from pygame import locals




jlist = [] # global joystick list


class Joystick:


    def __init__(self):
        pygame.init()
        self.nbJoy = pygame.joystick.get_count()

        for n in range(self.nbJoy):
            pygame.joystick.Joystick(n).init()

        try:
            for n in range(pygame.joystick.get_count()): #
                stick = pygame.joystick.Joystick(n)
                jlist.append(stick) # create a joystick instance
                stick.init() # init instance
                # report joystick charateristics #
                print '-'*20
                print 'Enabled joystick: ' + stick.get_name()
                print 'it has the following devices :'
                print '--> buttons : '+ str(stick.get_numbuttons())
                print '--> balls : '+ str(stick.get_numballs())
                print '--> axes : '+ str(stick.get_numaxes())
                print '--> hats : '+ str(stick.get_numhats())
                print '-'*20
        except pygame.error:
            print 'pygame.error, no joystick found.'





    def main(self):


    #    init() # init pygame and joystick system


        while 1: # endless loop

            for e in pygame.event.get(): # iterate over event stack


                if e.type == pygame.locals.JOYAXISMOTION: # 7
                    for j in jlist:
                        for n in range(j.get_numaxes()):
                            print 'moved axe num '+str(n)+' : ' +
str(j.get_axis(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYBALLMOTION: # 8
                    for j in jlist:
                        for n in range(j.get_numballs()):
                            print 'moved ball num '+str(n)+' : '+
str(j.get_ball(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYHATMOTION: # 9
                    for j in jlist:
                        for n in range(j.get_numhats()):
                            print 'moved hat num '+str(n)+' : '+
str(j.get_hat(n))
                            print '-'*10 # separation


                elif e.type == pygame.locals.JOYBUTTONDOWN: # 10
                    for j in jlist:
                        for n in range(j.get_numbuttons()):
                            if j.get_button(n) : # if this is down
                                print 'down button num '+str(n)+' : '+
str(j.get_button(n))
                                print '-'*10 # separation

                elif e.type == pygame.locals.JOYBUTTONUP: # 11
                    for j in jlist:
                        for n in range(j.get_numbuttons()):
                            print 'up button num '+str(n)+' : '+
str(j.get_button(n))
                            print '-'*10 # separation


if __name__ == '__main__':
    j = Joystick()
    j.main()


thanks
shreyas






On Thu, Feb 12, 2009 at 11:36 PM, Banibrata Dutta <banibrata.dutta at gmail.com
> wrote:

> AFAIK, the mechanism / API / protocol to actuate the Camera's tilt, pan,
> zoom functions are not standardized (happy to be corrected there!), so even
> if you find something, it'd most likely be something very specific to a
> particular device.
> As for Joystick usage, I remember seeing one thread on that couple of
> months back, so searching thru the archive should give you leads.
>
> On Fri, Feb 13, 2009 at 3:33 AM, shreyas shah <shreyas22 at gmail.com> wrote:
>
>> Hi ,
>>
>> I am trying to control the motion of the camera with help of joystick , i
>> need some basic functionality where if i move a joystick to left the camera
>> moves to the left . Can anyone help me with that ?
>>
>> Thanks
>> Shreyas
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> regards,
> Banibrata
> http://www.linkedin.com/in/bdutta
>
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From bearophileHUGS at lycos.com  Mon Feb 16 16:29:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 13:29:11 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
Message-ID: <c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>

Jayson Santos:
> Hello people, I'm writing a Bitmap parser for study purposes,

This code:

        x = 0
        y = 0
        for line in bmp.bitmap_lines.lines:
            for color in xrange(len(line.colors)):
                canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x"
% (line.colors[color].red, line.colors[color].green, line.colors
[color].blue))
                x += 1
            x = 0
            y += 1


May be replaced with something like:

for x, color in enumerate(line.colors):
    canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x" %
(color.red, color.green, color.blue))

And maybe a RGBTriple may be replaced with an immutable namedtuple.
Using nested classes may be overkill for this program.

Use the Python profiler and profile your code with a real image, and
show us/me the profiler results, so I can give you some suggestions to
speed up your code.

Bye,
bearophile


From nick at craig-wood.com  Mon Feb 16 16:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 16 Feb 2009 15:31:55 -0600
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
Message-ID: <slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>

laplacian42 at gmail.com <laplacian42 at gmail.com> wrote:
>  I think I just found the GUI toolkit for Python I've been searching
>  for. It seems to meet all of the following requirements:
> 
>    * free software
>    * small (I don't need batteries -- Python already comes with those.)
>    * easy to use
>    * actively maintained
>    * cross-platform
>    * easy to install
>    * based on a stable and actively-maintained C library
>    * does not depend on an external scripting language (for example,
>  Tcl)
>    * well-documented
>    * not too many dependencies
>    * can easily integrate with PyOpenGL
>    * support for accessibility
> 
>  and it's also written in Python.
> 
>  I have no idea how it's stayed under the radar in the Python community
>  for this long, yet here it is: [OcempGUI](http://ocemp.sourceforge.net/
>  gui.html). The C library it depends upon? [SDL](http://
>  www.libsdl.org/) (via [PyGame](http://www.pygame.org/news.html)).

Interesting!  One of the commercial apps I'm involved (C++ not python)
in uses SDL as its GUI with windows etc built on top of it.  It means
that it looks exactly the same on all supported platforms and since it
usually runs full screen that is fine.  I imagine this GUI toolkit
fits the same niche.

Presumably since it uses SDL then all the GUI will appear in one
window?  So windows within windows in the MDI style?

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From nick at craig-wood.com  Mon Feb 16 16:31:55 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 16 Feb 2009 15:31:55 -0600
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<gn9mr3$kp5$2@ger.gmane.org>
	<mailman.9581.1234728304.3487.python-list@python.org>
Message-ID: <slrngpjk8u.1l3.nick@irishsea.home.craig-wood.com>

python at bdurham.com <python at bdurham.com> wrote:
>  Thanks for everyone's feedback. I believe my original post's code
>  (updated following my signature) was in line with this list's feedback.
> 
>  Christian: Thanks for reminding me about exponential formats. My updated
>  code accounts for these type of numbers. I don't need to handle inf or
>  nan values. My original code's except catches an explicit ValueError
>  exception per your concern about bare excepts.
> 
>  Malcolm
> 
> <code>
>  # str_to_num.py
> 
>  def isnumber( input ):
>      try:
>          num = float( input )
>          return True
> 
>      except ValueError:
>          return False

That is a fine solution.

Last time I had to solve this I had a specific format of number to
parse - I didn't want to include all the python formats.  This is what
I came up with...  This particular code returns the converted number
or 0.0 - adjust as you see fit!

import re

_float_pattern   = re.compile(r"^\s*([-+]?(\d*\.)?\d+([eE][-+]?\d+)?)")

def atof(value):
    """
    Convert a string to an float in the same way the c-library atof()
    does.  Ie only converting as much as it can and returning 0.0 for
    an error.
    """
    match = _float_pattern.search(value)
    if match:
        return float(match.group(1))
    return 0.0

>>> atof("15.5 Sausages")
15.5
>>> atof("   17.2")
17.199999999999999
>>> atof("0x12")
0.0
>>> atof("8.3.2")
8.3000000000000007
>>> atof("potato")
0.0
>>>

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From python.list at tim.thechases.com  Mon Feb 16 16:36:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 16 Feb 2009 15:36:17 -0600
Subject: flexible find and replace ?
In-Reply-To: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <4999DC51.3010004@tim.thechases.com>

> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
> 
> ".......TAG............TAG................TAG..........TAG....."
> 
> is replaced by this :
> 
> ".......REPL01............REPL02................REPL03..........REPL04..."



This is a variant of the class I've used in the past for stateful 
replacements:

   import re

   class Counter(object):
     def __init__(self, prefix="REPL", start=1):
     	self.prefix = prefix
     	self.counter = start - 1
     def __call__(self, matchobj):
     	self.counter += 1
     	return "%s%02i" % (self.prefix, self.counter)

   r = re.compile("TAG") # the regexp to find what we want
   s = "some TAG stuff with TAG whatever more TAG stuff"

   print s
   # just use the counter
   print r.sub(Counter(), s)
   # demo a different starting number
   print r.sub(Counter(start=42), s)
   # maintain a single counter across calls
   c = Counter(prefix="Hello", start=42)
   print r.sub(c, s)
   print r.sub(c, s)

> A better and clever method than this snippet should exist I hope :
> 
> counter = 1
> while 'TAG' in mystring:
>     mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
>     counter+=1
>     ...
> 
> (the find is always re-starting at the string beginning, this is not
> efficient.

This also has problems if your search-string is a substring of 
your replacement string:

   search = "foo"
   replacement = "foobar#"

You'll get

   s = "foo_foo"
   s = "foobar01_foo"
   s = "foobar02bar01_foo"
   ...

which isn't quite what it looks like you want.

-tkc





From laplacian42 at gmail.com  Mon Feb 16 16:44:07 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 13:44:07 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
Message-ID: <588d2dad-ff75-499d-a4de-0b486e81f99f@p20g2000yqi.googlegroups.com>

On Feb 16, 4:31?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
>
> Interesting! ?One of the commercial apps I'm involved (C++ not python)
> in uses SDL as its GUI with windows etc built on top of it. ?It means
> that it looks exactly the same on all supported platforms and since it
> usually runs full screen that is fine. ?I imagine this GUI toolkit
> fits the same niche.
>
> Presumably since it uses SDL then all the GUI will appear in one
> window? ?So windows within windows in the MDI style?
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

There is a `window.py` example that comes with the distribution. It
has modal and non-modal windows within the main window.

I haven't yet seen any examples where OcempGUI runs full-screen.

The relevant portion of the manual re. subwindows is:
http://ocemp.sourceforge.net/manual/windows_and_dialogs.html


From dotancohen at gmail.com  Mon Feb 16 16:46:31 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Mon, 16 Feb 2009 23:46:31 +0200
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<slrngpjjo7.1l3.nick@irishsea.home.craig-wood.com>
Message-ID: <880dece00902161346v5e753d79x228cc4930fa76e49@mail.gmail.com>

> Interesting!  One of the commercial apps I'm involved (C++ not python)
> in uses SDL as its GUI with windows etc built on top of it.  It means
> that it looks exactly the same on all supported platforms and since it
> usually runs full screen that is fine.  I imagine this GUI toolkit
> fits the same niche.
>

Most cross-platform projects come to the conclusion that it is _not_
good to look the same on each supported platform, but rather to match
the look of each individual platform. Open Office and Firefox come to
mind.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From jcd at sdf.lonestar.org  Mon Feb 16 17:06:21 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Mon, 16 Feb 2009 17:06:21 -0500
Subject: wxPython and Croatian characters
In-Reply-To: <6vtrqdFltc8eU2@mid.uni-berlin.de>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<6vtrqdFltc8eU2@mid.uni-berlin.de>
Message-ID: <1234821981.28977.4.camel@aalcdl07.lib.unc.edu>

On Mon, 2009-02-16 at 20:06 +0100, Diez B. Roggisch wrote:
> vedrandekovic at gmail.com schrieb:
> > Hello,
> > 
> > I have problem with configuring my wxPython script to work with
> > Croatian characters like:  ?,?,?,?,?.
> > Here is my simple script without wxPython (this script works):
> > 
> >       # -*- coding: utf-8 -*-
> >       s = "hello normal string ?????"
> >       print s
> > 
> > ..here is my snippet with wxPython:
> > 
> >     text = wx.StaticText(self, -1,"Mati?ni broj",(0,100)) # in this
> > example,we have character "?"
> > 
> > ...when I run this text, it looks something like:  "Mati",some weird
> > characters ,and "ni"
> 
> Unless you are using python 3.0 (which I doubt, afaik no wx available), 
> your above coding declaration is useless for the shown piece of code, as 
> it only applies to unicode literals, which are written with a preceding u.
> 

No.  The coding declaration does nothing to unicode literals.  It only
affects how the python's source code parser reads the the source code.
Without it, your source code will be parsed (or is it lexed?) by python
as an ascii document.  So if your document is UTF-8, it will choke as
soon as it reaches a non ascii character.  If it's encoded in UTF-16,
however, it will choke right away, as it will immediately come across a
\x00 byte, which is treated as the ascii NULL character, which is not
legal in python source code.

But print will still try to encode all unicode objects to the encoding
of your terminal, and any file writing operations will try to decode as
ASCII, unless explicitly told otherwise.  Same as without the -*- coding
-*- declaration. 

For the OP:  

When dealing with potentially non-ascii text, always use unicode objects
instead of strings, and explicitly encode them to the encoding you want
on output, unless your printing facility (here wx.StaticText) handles
that for you.  I also don't know how wxpython works in this regard.  

So:

s = u"Mati?ni broj"             # instead of "Mati?ni broj"
text = wx.StaticText(self, -1, s,(0,100))
# or if that doesn't work try this:
#text = wx.StaticText(self, -1, s.encode('utf-8'), (0,100))

Cheers,
Cliff




From martin at v.loewis.de  Mon Feb 16 17:49:18 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Mon, 16 Feb 2009 23:49:18 +0100
Subject: wxPython and Croatian characters
In-Reply-To: <mailman.76.1234821986.11746.python-list@python.org>
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>	<6vtrqdFltc8eU2@mid.uni-berlin.de>
	<mailman.76.1234821986.11746.python-list@python.org>
Message-ID: <4999ED6E.1090804@v.loewis.de>

>> Unless you are using python 3.0 (which I doubt, afaik no wx available), 
>> your above coding declaration is useless for the shown piece of code, as 
>> it only applies to unicode literals, which are written with a preceding u.
>>
> 
> No.  The coding declaration does nothing to unicode literals.  It only
> affects how the python's source code parser reads the the source code.

And, as such, it *only* affects Unicode literals, really nothing else
(except for error checking).

In 2.x, non-ASCII characters can occur only in these places:
- comments. no effect on semantics of script
- string literals. run-time representation is equal to on-disk
  representation, so no effect.
- unicode literals. run-time representation is 2-byte or 4-byte UCS,
  so parser needs to decode on-disk representation to in-memory
  representation. This is the *only* place where the declared encoding
  matters.

> Without it, your source code will be parsed (or is it lexed?) by python
> as an ascii document.  So if your document is UTF-8, it will choke as
> soon as it reaches a non ascii character. 

So yes, it does an additional error check also. But the main reason for
the encoding declaration (besides sanity for text editors also) is
Unicode literals (in 3.x, also relevant for identifiers)

Regards,
Martin


From invalid at example.invalid  Mon Feb 16 17:57:28 2009
From: invalid at example.invalid (Greg Krohn)
Date: Mon, 16 Feb 2009 16:57:28 -0600
Subject: time.strptime() and time.strftime() reciprocity
Message-ID: <vbmml.10815$RJ7.7831@newsfe18.iad>

[Apologies for the use of "reciprocity" in the subject - it's a little 
pompous, I know, but it fits so well. :)]

Hello c.l.python!

I'm trying to parse some dates of the form "01/29/09 12:55 PM" from a 
CSV file, but I'm having trouble with the format string in 
time.strptime() . In testing this I found that the time module chokes on 
a string that it created itself with the same format:

ActivePython 2.6.1.1 (ActiveState Software Inc.) based on
Python 2.6.1 (r261:67515, Dec  5 2008, 13:58:38) [MSC v.1500 32 bit 
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import time
 >>> fmt = "%m/%d/%y %I:%M %p"
 >>> print time.strptime(fmt, time.strftime(fmt))
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Python26\lib\_strptime.py", line 454, in _strptime_time
     return _strptime(data_string, format)[0]
   File "C:\Python26\lib\_strptime.py", line 325, in _strptime
     (data_string, format))
ValueError: time data '%m/%d/%y %I:%M %p' does not match format 
'02/16/09 04:52
PM'

So, yeah, that seems weird to me. Does anyone get similar results, know 
why this is happening, and/or how to fix it?

Thanks.

-- 
("%s at gmail com" % "Greg Krohn".lower()).replace(" ", ".")


From santosdosreis at gmail.com  Mon Feb 16 18:08:58 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 15:08:58 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
Message-ID: <e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>

On 16 fev, 18:29, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Hello people, I'm writing a Bitmap parser for study purposes,
>
> This code:
>
> ? ? ? ? x = 0
> ? ? ? ? y = 0
> ? ? ? ? for line in bmp.bitmap_lines.lines:
> ? ? ? ? ? ? for color in xrange(len(line.colors)):
> ? ? ? ? ? ? ? ? canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x"
> % (line.colors[color].red, line.colors[color].green, line.colors
> [color].blue))
> ? ? ? ? ? ? ? ? x += 1
> ? ? ? ? ? ? x = 0
> ? ? ? ? ? ? y += 1
>
> May be replaced with something like:
>
> for x, color in enumerate(line.colors):
> ? ? canvas.create_line(x, y, x+1, y, fill="#%02x%02x%02x" %
> (color.red, color.green, color.blue))
>
> And maybe a RGBTriple may be replaced with an immutable namedtuple.
> Using nested classes may be overkill for this program.
>
> Use the Python profiler and profile your code with a real image, and
> show us/me the profiler results, so I can give you some suggestions to
> speed up your code.
>
> Bye,
> bearophile

Hello bearophile,
Thank you and Terry for your answers.
Here is the new code using your changes http://pastebin.com/m6dfe619d
And here is the profiler http://pastebin.com/m74d282b8

Best Regards
Jayson Reis


From aleksandar27 at brisiovonet.hr  Mon Feb 16 18:09:50 2009
From: aleksandar27 at brisiovonet.hr (alejandro)
Date: Tue, 17 Feb 2009 00:09:50 +0100
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com>
Message-ID: <gncrom$iil$1@ss408.t-com.hr>

Provjeri da si nisi stavio ansii kada si instalirao wx.python.
Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u 
UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem 




From bearophileHUGS at lycos.com  Mon Feb 16 18:41:37 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 15:41:37 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
Message-ID: <ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>

Jayson Santos:
> Here is the new code using your changeshttp://pastebin.com/m6dfe619d
> And here is the profilerhttp://pastebin.com/m74d282b8

I have suggested you to profile the program mostly for pedagogical
purposes, it's often a good thing to do if you want to speed up a
program. But now it's your job to read the output of the profiler and
try to find where the performance problems are. The profiler output
will be simpler for you to read if you sort lines according to
something better than method name (something like the time used by
functions sounds better) and you tell the profiler to show only the
first few lines.

But a profiler isn't enough, you also need to use the brain. Your code
looks a bit too much OOP :-) So in Java your code may run fast enough,
but in Python it may be too much slow.
The suggestions by Terry are good if you want to speed up your code
signifiantly. Creating a very large amount of objects inside inner
loops a slow thing in Java too, not just in Python. Generally to
create an object you need to allocate memory. Try to write your program
(s) avoiding all or most memory allocations inside the inner loops,
and you will see a big improvement in running speed.

Bye,
bearophile


From santosdosreis at gmail.com  Mon Feb 16 19:13:13 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Mon, 16 Feb 2009 16:13:13 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
Message-ID: <4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>

On 16 fev, 20:41, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Here is the new code using your changeshttp://pastebin.com/m6dfe619d
> > And here is the profilerhttp://pastebin.com/m74d282b8
>
> I have suggested you to profile the program mostly for pedagogical
> purposes, it's often a good thing to do if you want to speed up a
> program. But now it's your job to read the output of the profiler and
> try to find where the performance problems are. The profiler output
> will be simpler for you to read if you sort lines according to
> something better than method name (something like the time used by
> functions sounds better) and you tell the profiler to show only the
> first few lines.
>
> But a profiler isn't enough, you also need to use the brain. Your code
> looks a bit too much OOP :-) So in Java your code may run fast enough,
> but in Python it may be too much slow.
> The suggestions by Terry are good if you want to speed up your code
> signifiantly. Creating a very large amount of objects inside inner
> loops a slow thing in Java too, not just in Python. Generally to
> create an object you need to allocate memory. Try to write your program
> (s) avoiding all or most memory allocations inside the inner loops,
> and you will see a big improvement in running speed.
>
> Bye,
> bearophile

Hello bearophile,
Thank you for all, I'm reviewing all my code.
Do I need use some patters or others progamming conventions ?
I tried PIL and PyGame source however they are in C and I can't
understand read and draw functions.
Do you know a python-only image library ?

Best Regards
Jayson


From denis.kasak at gmail.com  Mon Feb 16 19:26:04 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 16 Feb 2009 16:26:04 -0800 (PST)
Subject: time.strptime() and time.strftime() reciprocity
References: <vbmml.10815$RJ7.7831@newsfe18.iad>
Message-ID: <df2094b9-1be3-4f63-8ae9-1405d08e82b9@f20g2000yqg.googlegroups.com>

On Mon, Feb 16, 2009 at 11:57 PM, Greg Krohn <invalid at example.invalid>
wrote:

<snip>

> ActivePython 2.6.1.1 (ActiveState Software Inc.) based on
> Python 2.6.1 (r261:67515, Dec  5 2008, 13:58:38) [MSC v.1500 32 bit (Intel)]
> on
> win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import time
>>>> fmt = "%m/%d/%y %I:%M %p"
>>>> print time.strptime(fmt, time.strftime(fmt))
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "C:\Python26\lib\_strptime.py", line 454, in _strptime_time
>    return _strptime(data_string, format)[0]
>  File "C:\Python26\lib\_strptime.py", line 325, in _strptime
>    (data_string, format))
> ValueError: time data '%m/%d/%y %I:%M %p' does not match format '02/16/09
> 04:52
> PM'
>
> So, yeah, that seems weird to me. Does anyone get similar results, know why
> this is happening, and/or how to fix it?

It's actually pretty trivial to fix, which you would have also known
if you had read the message of the exception more carefully. :P

You passed the arguments for strptime() the wrong way around. Just
pass them in reverse and your problem will be fixed.

--
Denis Kasak


From noama at answers.com  Mon Feb 16 19:41:26 2009
From: noama at answers.com (Noam Aigerman)
Date: Tue, 17 Feb 2009 02:41:26 +0200
Subject: Referencing resources from python
Message-ID: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>

Hi,

What is the best way to reference a non-python file's path from inside
python ?

Until now, I (stupidly) had such lines  as:

 

theFile=open('../somefile.txt')

 

in my  python files. Now I moved my python files to another dir, and all
those relative filenames broke.

On the other hand, the solution of writing the full path of each
resource isn't welcome either, as we're working from a SVN repository
and we sometimes checkout to different dir's. I am sure there is a third
way which didn't occur to me... 

What do you recommend?

Thanks, Noam

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From kentandkat at sbcglobal.net  Mon Feb 16 19:46:04 2009
From: kentandkat at sbcglobal.net (kentandkat at sbcglobal.net)
Date: Mon, 16 Feb 2009 18:46:04 -0600
Subject: tkinter in python30
Message-ID: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>

Does anyone know what happened to tkinter in Python3? There is a tkinter
folder in the Lib folder, but there is no Tkinter.py that I can
find. Both "from Tkinter import *" and "from _tkinter import *" result
in "no such module" error messages. What gives?

Kent


From bearophileHUGS at lycos.com  Mon Feb 16 19:47:08 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Mon, 16 Feb 2009 16:47:08 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
Message-ID: <12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>

Jayson Santos:
> Do I need use some patters or others progamming conventions ?

That's a strong question...
Knowing OOP well is important, and it's often a good way to program,
etc. But... You may try to rewrite your code with functions only and
no classes (well, you may need to use classes for the TK gui).
Feel free to not follow this suggestion of mine. Even if you follow
it, it will not damage your brain :-)

Bye,
bearophile


From laplacian42 at gmail.com  Mon Feb 16 20:07:56 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 17:07:56 -0800 (PST)
Subject: tkinter in python30
References: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
Message-ID: <8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>

On Feb 16, 7:46?pm, kentand... at sbcglobal.net wrote:
> Does anyone know what happened to tkinter in Python3? There is a tkinter
> folder in the Lib folder, but there is no Tkinter.py that I can
> find. Both "from Tkinter import *" and "from _tkinter import *" result
> in "no such module" error messages. What gives?
>
> Kent

http://docs.python.org/3.0/library/tkinter.html


From tony at medioh.com  Mon Feb 16 20:10:58 2009
From: tony at medioh.com (Tony Arcieri)
Date: Mon, 16 Feb 2009 18:10:58 -0700
Subject: What are your favorite Python features?
Message-ID: <c7e6b2b00902161710p59e1945nbb6ee791db108687@mail.gmail.com>

I'm creating a new language which borrows from Python (among other
languages), and I'm curious what features of Python its users enjoy the
most.

I posted a similar thread on ruby-talk with a poll, but unfortunately my
background in Python is much weaker than it is in Ruby.  That said, here are
some of the features of Python that I'm considering adding to my language
(or are already there):

- list comprehensions
- lambdas
- keyword arguments
- built-in help
- decorators
- docstrings
- obtaining references to methods with var.method
- UCS4 internal string representation

What are *your* favorite features of Python?  I'm particularly interested in
ones not included in this list.  I'm not looking for "Python exclusive"
features so much as features you use frequently which make your life easier
which aren't particularly common among the more popular languages.

P.S. If you're curious about my language you can read about it here:
http://wiki.reia-lang.org and see some working examples of the syntax (which
borrows heavily from Python) here:
http://github.com/tarcieri/reia/tree/master/examples

--
Tony Arcieri
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From rhodri at wildebst.demon.co.uk  Mon Feb 16 20:25:14 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 17 Feb 2009 01:25:14 -0000
Subject: Referencing resources from python
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>
References: <749CACF29BDFB64E9F80189ECD77868804E87711@jermail1.atomant.net>
Message-ID: <op.upg18cera8ncjz@gnudebst>

On Tue, 17 Feb 2009 00:41:26 -0000, Noam Aigerman <noama at answers.com>  
wrote:

> Hi,
>
> What is the best way to reference a non-python file's path from inside
> python ?
>
> Until now, I (stupidly) had such lines  as:
>
>
> theFile=open('../somefile.txt')
>
>
> in my  python files. Now I moved my python files to another dir, and all
> those relative filenames broke.
>
> On the other hand, the solution of writing the full path of each
> resource isn't welcome either, as we're working from a SVN repository
> and we sometimes checkout to different dir's. I am sure there is a third
> way which didn't occur to me...
>
> What do you recommend?

It rather depends on what the files are.  Some (clearly not this) will
be best coded as absolute paths.  Probably your best bet otherwise is
to set an environment variable outside Python to point to the appropriate
directory, and read it out of the os.environ dictionary.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 16 20:29:31 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 16 Feb 2009 17:29:31 -0800
Subject: tkinter in python30
In-Reply-To: <8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>
References: <ur61xc2lv.fsf@JABBERWALK.i-did-not-set--mail-host-address--so-tickle-me>
	<8666c553-3c17-4917-866f-0ba8638eab4f@j35g2000yqh.googlegroups.com>
Message-ID: <50697b2c0902161729u784802d6xa08b94214434ccdf@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:07 PM,  <laplacian42 at gmail.com> wrote:
> On Feb 16, 7:46 pm, kentand... at sbcglobal.net wrote:
>> Does anyone know what happened to tkinter in Python3? There is a tkinter
>> folder in the Lib folder, but there is no Tkinter.py that I can
>> find. Both "from Tkinter import *" and "from _tkinter import *" result
>> in "no such module" error messages. What gives?
>>
>> Kent
>
> http://docs.python.org/3.0/library/tkinter.html

Or IOW, they fixed the capitalization of its name to bring it in line
w/ PEP8, so it's now tkinter (with a lowercase t) rather than Tkinter.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From benjamin at python.org  Mon Feb 16 20:29:37 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Mon, 16 Feb 2009 19:29:37 -0600
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
	<ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
Message-ID: <1afaf6160902161729x6c21679akdfb4998692108b67@mail.gmail.com>

On Mon, Feb 16, 2009 at 5:50 PM, Guido van Rossum <guido at python.org> wrote:
> Can you explain the difficulty with porting setuptools in more detail?

Basically setuptools invokes a functions in distutils that was still
using cmp(). (See the latest messages in issue #1717 for all the
details.)



-- 
Regards,
Benjamin


From hellyj at ucsd.edu  Mon Feb 16 20:35:41 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Mon, 16 Feb 2009 17:35:41 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
Message-ID: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>

Hi.

I'm a newbie to python and am running:

OS X 10.5.6
Python 2.5.4

and have run easy_install for gdal like this:

/Library/Python/2.5/site-packages>sudo easy_install GDAL
Password:
Searching for GDAL
Best match: GDAL 1.6.0
Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
GDAL 1.6.0 is already the active version in easy-install.pth

Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
i386.egg
Processing dependencies for GDAL
Finished processing dependencies for GDAL

However, when I run python and try to import gdal, this is what happens:

Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> import gdal
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
ImportError: No module named gdal
 >>>

Clearly, it's not being found but I don't understand how to debug this  
any further.  I have the *.egg in the site-packages directory but  
don't understand if there is something else I have to do to make it  
usable.  Any help would be much appreciated.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

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From mamahitasela at yahoo.com  Mon Feb 16 20:53:11 2009
From: mamahitasela at yahoo.com (Mamahita Sela)
Date: Mon, 16 Feb 2009 17:53:11 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
In-Reply-To: <9289e298-a123-47e9-855a-3df71d92e078@l1g2000yqj.googlegroups.com>
Message-ID: <983541.54614.qm@web46205.mail.sp1.yahoo.com>

Dear FB,

> As you have been already told, join() blocks until the
> thread is
> terminated. and you should avoid that.
> A simple fix could by add a timeout to t.join, doing
> something like :
>         t.join(JOIN_TIMEOUT);
>         if not t.isAlive():
>             print t.result
> 

Thanks for your great sample. And, thank you for your tips on speedup the ping stuff. 

However, i still have problem when adding timeout to join(). 
- It works, but only print out thread result that is not alive, as we put in the code. So, i never get result from unsuccessful ping action, which might take more time than timeout specified. 
- I still have little delay in GUI. Is it possible to make it smooth in GUI operation? When i put more timeout (say: 0.5 from 0.2), i will have to wait  longer.

PS: thanks for pointing out inefficient ping action :) I will follow the tips. But, another time I might need to do something else, like downloading files, or checking for serial devices. So, this thread thing, imho, is very important. 

Any help would be very appreciated.
M.


      



From sjmachin at lexicon.net  Mon Feb 16 21:27:16 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 16 Feb 2009 18:27:16 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com>

On Feb 17, 7:10?am, OdarR <Olivier.Da... at gmail.com> wrote:
> Hi guys,
>
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
>
> ".......TAG............TAG................TAG..........TAG....."
>
> is replaced by this :
>
> ".......REPL01............REPL02................REPL03..........REPL04..."
>
> A better and clever method than this snippet should exist I hope :
>
> counter = 1
> while 'TAG' in mystring:
> ? ? mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
> ? ? counter+=1
> ? ? ...
>
> (the find is always re-starting at the string beginning, this is not
> efficient.
>
> any ideas ? thanks,

C:\junk>type fancyrepl.py
def fancyrepl(tag, replfunc, input_string):
    count = 0
    pieces = []
    pos = 0
    taglen = len(tag)
    while 1:
        try:
            newpos = input_string.index(tag, pos)
        except ValueError:
            pieces.append(input_string[pos:])
            return ''.join(pieces)
        pieces.append(input_string[pos:newpos])
        count += 1
        pieces.append(replfunc(count))
        pos = newpos + taglen

tests = [
    '',
    'XXX',
    'XXXXXX',
    'abcdeXXX',
    'XXXfghij',
    'abcdeXXXfghij',
    'abcdeXXXfghijXXXpqrst',
    ]

for test in tests:
    print ' <', repr(test)
    result = fancyrepl('XXX', lambda n: 'SUB%d' % n, test)
    print ' >', repr(result)

C:\junk>fancyrepl.py
 < ''
 > ''
 < 'XXX'
 > 'SUB1'
 < 'XXXXXX'
 > 'SUB1SUB2'
 < 'abcdeXXX'
 > 'abcdeSUB1'
 < 'XXXfghij'
 > 'SUB1fghij'
 < 'abcdeXXXfghij'
 > 'abcdeSUB1fghij'
 < 'abcdeXXXfghijXXXpqrst'
 > 'abcdeSUB1fghijSUB2pqrst'

HTH,
John




From ironfroggy at gmail.com  Mon Feb 16 21:29:20 2009
From: ironfroggy at gmail.com (Calvin Spealman)
Date: Mon, 16 Feb 2009 21:29:20 -0500
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
Message-ID: <76fd5acf0902161829jd8966c1wc4eb0f9295948590@mail.gmail.com>

FWIW; I think a 3.0.2 would be useful socially (even volunteer projects have
marketting issues to consider). It says "we are committed to making 3.x
work", while the quick jump to 3.1 with only a limited minor fix release to
3.0 says "we stumbled into this and have to just brush this under the rug.
But we got it right this time! I hope.."

On Feb 16, 2009 2:08 PM, "Lennart Regebro" <regebro at gmail.com> wrote:

I discovered some remaining cmp() in 3.0.1, 38 minutes after Benjamin
fixed them. :) Unfortunately, that means porting setuptools to 3.0.1
will be a bit difficult. So my question is: Will there be a 3.0.2 with
those fixes, or should I add workaround code for 3.0.1?

--
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64
_______________________________________________
Python-Dev mailing list
Python-Dev at python.org
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Unsubscribe:
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From odeits at gmail.com  Mon Feb 16 22:04:38 2009
From: odeits at gmail.com (odeits)
Date: Mon, 16 Feb 2009 19:04:38 -0800 (PST)
Subject: Changing the Image on a button
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
Message-ID: <e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>

On Feb 16, 8:40?am, John Posner <jjpos... at snet.net> wrote:
> ?>> from Tkinter import *
> ?>>
> ?>> def do():
> ?>> ? ? btn.configure(image = None)
> ?>>
> ?>> root = Tk()
> ?>> img1 = PhotoImage(file="bacon.gif")
> ?>>
> ?>> btn = Button(image = img1, command = do, text = "hello" )
> ?>> btn.img = img1
> ?>> btn.pack()
> ?>> root.mainloop()
> ?>>
>
> Try this change:
>
> ? from: btn.configure(image = None)
> ? ? to: img1.blank()
>
> -John
>
> E-mail message checked by Spyware Doctor (6.0.0.386)
> Database version: 5.11770http://www.pctools.com/en/spyware-doctor-antivirus/

This does in fact clear the image out, however it isn't causing the
text to display... Do i have have to create a new button and swap it
out?


From aahz at pythoncraft.com  Mon Feb 16 22:35:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 16 Feb 2009 19:35:02 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
	<mailman.52.1234797812.11746.python-list@python.org>
Message-ID: <gndb96$97u$1@panix3.panix.com>

In article <mailman.52.1234797812.11746.python-list at python.org>,
Hendrik van Rooyen <mail at microcorp.co.za> wrote:
>
>Occam was the language that should have won the marketing prize, but
>didn't.

It wasn't simple enough.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From bignose+hates-spam at benfinney.id.au  Mon Feb 16 22:42:17 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 17 Feb 2009 14:42:17 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<977bad202990de5797c2efcf8d50ed81.squirrel@localhost>
	<mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
Message-ID: <87fxidohk6.fsf@benfinney.id.au>

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <mail at microcorp.co.za> wrote:
> >Occam was the language that should have won the marketing prize,
> >but didn't.
> 
> It wasn't simple enough.

*bdom-tsssh* <URL:http://en.wikipedia.org/wiki/Occam's_razor>

-- 
 \      ?I guess we were all guilty, in a way. We all shot him, we all |
  `\   skinned him, and we all got a complimentary bumper sticker that |
_o__)                         said, ?I helped skin Bob.?? ?Jack Handey |
Ben Finney


From gnewsg at gmail.com  Mon Feb 16 23:18:15 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Mon, 16 Feb 2009 20:18:15 -0800 (PST)
Subject: How to verify whether a process got hanged or still alive.
References: <ead1179d-5323-4542-886a-27eddc01d848@x14g2000yqk.googlegroups.com>
Message-ID: <0f13a2e0-8aa9-46c8-bedf-023445fbe6c2@x9g2000yqk.googlegroups.com>

On 16 Gen, 00:04, neel <leon... at gmail.com> wrote:
> Hi There,
>
> I want to check the health of IEprocessusing python. I am running an
> application on IE. I have to verify that the application is not
> crashing the IE. Is there any module which can help me in getting theprocessstatus?
>
> Thanks,
> Neel


By process status you mean knowing whether the process is running,
sleeping has been suspended, [...]?
Hopefully this should be implemented in psutil soon:
http://code.google.com/p/psutil


--- Giampaolo
http://code.google.com/p/pyftpdlib


From michele.simionato at gmail.com  Mon Feb 16 23:53:39 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 16 Feb 2009 20:53:39 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.45.1234790250.11746.python-list@python.org>
	<d-CdnWapfPzmOATUnZ2dnUVZ_vadnZ2d@pdx.net> 
	<f78c8501-f4ca-4d82-8210-44279d17d294@w34g2000yqm.googlegroups.com>
Message-ID: <b6cdce73-0dde-4aad-a7f7-2a5253ab766a@h16g2000yqj.googlegroups.com>

On Feb 16, 10:20?pm, rushen... at gmail.com wrote:
> Hi again
>
> OpenERP and ERP5 was written in python as i know. I really wonder how
> they do this without threads. I want to see a real time graph at the
> same time while i am working on the same screen. What is the secret?
>
> Thanks
> Rushen

Here is an example of using multiprocessing (which is included
in Python 2.6 and easy_installable in older Python versions)
to print a spin bar while a computation is running:

import sys, time
import multiprocessing

DELAY = 0.1
DISPLAY = [ '|', '/', '-', '\\' ]

def spinner_func(before='', after=''):
    write, flush = sys.stdout.write, sys.stdout.flush
    pos = -1
    while True:
        pos = (pos + 1) % len(DISPLAY)
        msg = before + DISPLAY[pos] + after
        write(msg); flush()
        write('\x08' * len(msg))
        time.sleep(DELAY)

def long_computation():
    # emulate a long computation
    time.sleep(3)

if __name__ == '__main__':
    spinner = multiprocessing.Process(
        None, spinner_func, args=('Please wait ... ', ''))
    spinner.start()
    try:
        long_computation()
        print 'Computation done'
    finally:
        spinner.terminate()


From peter at www.pjb.com.au  Tue Feb 17 00:04:23 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 05:04:23 GMT
Subject: printing bytes to stdout in Py3
Message-ID: <slrngpkhao.3ri.peter@box8.pjb.com.au>

Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
io.TextIOWrapper object; but I want to output bytes
  (e.g. muscript -midi t > t.mid )
and they're coming out stringified :-(  How can I either change the
encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
mode, or dup(fd) it first, or whatever the right thing to do is ?

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From peter at www.pjb.com.au  Tue Feb 17 00:15:09 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 05:15:09 GMT
Subject: Module to read/write MIDI ?
References: <slrngph5b2.2qd.peter@box8.pjb.com.au>
	<mailman.41.1234789079.11746.python-list@python.org>
Message-ID: <slrngpkhuu.3ri.peter@box8.pjb.com.au>

On 2009-02-16, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>> I had my first look around pypi.python.org/pypi yesterday and didn't
>> see anything.  Is there a MIDI-module for Python ?  If not, I'll
>> email Sean to ask if he'd mind me translating his module into Python3...
>
> <http://www.mxm.dk/products/public/pythonmidi>
>
> This is the only project I have seen that aims to do that - I haven't
> actually used it, and there might be others out there (I believe pygame
> <www.pygame.org> supports midi-output).

That looks like it should do the job :-)
I can't actually import MidiOutFile successfully from Python3.0.1 yet,
but that must be a Py2 v. Py3 issue. Might have to investigate 2to3...

Thanks,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From xi11west at gmail.com  Tue Feb 17 00:21:16 2009
From: xi11west at gmail.com (Yuanxin Xi)
Date: Mon, 16 Feb 2009 23:21:16 -0600
Subject: memory recycling/garbage collecting problem
Message-ID: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>

I'm having some problems with the memory recycling/garbage collecting
of the following testing code:

>>> a=[str(i) for i in xrange(10000000)]
This takes 635m/552m/2044 memory (VIRT/RES/SHR)

>>> b={}
>>> for i in xrange(10000000):
...     b[str(i)]=i

Then the memory usage increased to 1726m/1.6g/2048

>>> del b
I expect the memory usage drop to the ammount before b was
created(635m/552m/2044), but it's actually 1341m/1.2g/2048

Could anyone please explain why this happens?  It seems some memory
are not freed.  I'm running into problems with this as my program is
very memory cosuming and need to frequently free some object to reuse
the memory.  What is the best way to free the memory of b completely
(i.e. back to the status as b was created)?  I'm using Python 2.5.2

Thanks.

Yuanxin


From clp2 at rebertia.com  Tue Feb 17 00:31:25 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 16 Feb 2009 21:31:25 -0800
Subject: memory recycling/garbage collecting problem
In-Reply-To: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
Message-ID: <50697b2c0902162131j2d6790pf798bc9cdda871eb@mail.gmail.com>

On Mon, Feb 16, 2009 at 9:21 PM, Yuanxin Xi <xi11west at gmail.com> wrote:
> I'm having some problems with the memory recycling/garbage collecting
> of the following testing code:
>
>>>> a=[str(i) for i in xrange(10000000)]
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>
>>>> b={}
>>>> for i in xrange(10000000):
> ...     b[str(i)]=i
>
> Then the memory usage increased to 1726m/1.6g/2048
>
>>>> del b
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
>
> Could anyone please explain why this happens?  It seems some memory
> are not freed.  I'm running into problems with this as my program is
> very memory cosuming and need to frequently free some object to reuse
> the memory.  What is the best way to free the memory of b completely
> (i.e. back to the status as b was created)?  I'm using Python 2.5.2

My understanding is that for efficiency purposes Python hangs on to
the extra memory even after the object has been GC-ed and doesn't give
it back to the OS right away. This shouldn't matter to your program
though, as the "extra" memory will still be available for its use. And
assuming you're using CPython and a/b isn't referred to by anything
else, I believe they should be GC-ed immediately by the refcount
system after the 'del' s executed. So, in theory you shouldn't need to
worry about any of this, unless your example is not accurate and
you're dealing with cyclical references or C objects or something.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sambit2005 at gmail.com  Tue Feb 17 00:44:51 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Tue, 17 Feb 2009 18:44:51 +1300
Subject: Need an application sends from paricular port
In-Reply-To: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
References: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
Message-ID: <9e680b420902162144o69e86806wd80383579e21d333@mail.gmail.com>

 Hi
>
> I am new to Python world
>
>  I need a python script , which binds at a user defind port & sends to
> other enity , which waits at particular port.
> The other enity will respond & Python script should receive that at the
> defined port
>
> The communication will happen over UDP
>
> e.g
>
> *Python Appl*
>
> IP: 10.116.78.90
> Port : 3000
>
>
> *Other Enity* :
>
> IP: 10.116.98.87
> Port : 3010
>
>
> Pyhon Appl ------------>UDP  ----> Other Enity
>                   <--------------------------
>
>
> Please help
>
>
>
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From matzke at berkeley.edu  Tue Feb 17 01:15:40 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Mon, 16 Feb 2009 22:15:40 -0800
Subject: pythonic array subsetting
Message-ID: <499A560C.4000209@berkeley.edu>

Hi,

So I've got a square floating point array that is about 1000 x 1000.  I 
need to  subset this array as efficiently as possible based on an 
ordered sublist of the list of rownames/colnames (they are the same, 
this is a symmetric array).

e.g., if sublist is of length 500, and matches the rownames list at 
every other entry, I need to pull out a 500x500 array holding every 
other row & column in the parent array.

I have to do this hundreds of times, so speed would be useful.

Cheers!
Nick



-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From pythonnutter at gmail.com  Tue Feb 17 01:21:03 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Tue, 17 Feb 2009 17:21:03 +1100
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
In-Reply-To: <66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <af90b3410902162221h1741d6p74423c6e102f6c8f@mail.gmail.com>

> Note: spelling is "OcempGUI". Also, since google broke some of the
> links,
> here's that main link again:

Thats my bad or more to the point my iPhone bad, typing fast with
spellcheck changes words to real dictionary words.


> Well, to be fair, SDL is pretty commonly-used software and they offer
> binary downloads for Mac OS X and MS Windows. Pygame seems to provide
> the same. So, installation should be a breeze.

Not on Mac. To get SDL, PyObjC, PyGame and other dependencies
installed on the platform you are talking on downloading and
installing close to 50MB+ of packages before you get to the point
where you install the OcempGUI package.

Thats a lot to ask of a user just to run my one program on their
system. If it was just myself and I wanted to go through the process
for educational/self-benefit I wouldn't mind.

But TkInter is already installed (0 dependencies) and on every Mac out
there so when I said 87Kbytes for a widget set that looks rather Mac
like I was saying compare 87Kbytes to 50+Megabytes to get a GUI for my
python application.

Along the same lines on my Linux boxes, GDK+/KDE are normally already
installed, nothing for the entire user base to install additional or
very little (additional) dependencies to install to get a wxWidget or
Qt interface going on those systems. Python wrappers are small but the
"additional" dependency installs above and beyond the base system is
what I am pointing at as killing off any interest in OcempGUI.

I also have this sneaking suspicion that the BDFL is secretly on the
sidelines waiting for the Tk tile theming engine to mature as if it
does and becomes standard in Python distributions I would say the
justification for learning wx and qt would be diminished by an unknown
quantity.

> What? Qt and wX are *huge* compared to OcempGUI.
>


From paddy3118 at googlemail.com  Tue Feb 17 01:27:15 2009
From: paddy3118 at googlemail.com (Paddy)
Date: Mon, 16 Feb 2009 22:27:15 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <7941293b-8423-42f9-8290-c1ddd7b17bc3@j38g2000yqa.googlegroups.com>

On Feb 16, 9:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs.

You are likely to find a lot of 'tick-list' type of comparison data on
the web that either needs a lot of knowledge to interpret, or is
misleading/wrong or all three!

Their are several versions of Python out their such as Ironpython,
Stackless Python, Jython as well as CPython - the main Python release.
They have different threading capabilities, but compilers of feature
comparison tick-lists tend to just stick to what CPython can do.

As an aside; if you were thinking of using threading for performance
reasons, then its best to first think of improving your general
ability to explore different algorithms. A change to an algorithm
often has the most impact on the performance of code. A better single
threaded, single process algorithm can offer better performaance than
throwing threadds or multiple processes alone when using a poor
underlying algorithm.

I was just exploring different ways of solving a problem on my blog:
  http://paddy3118.blogspot.com/2009/02/comparison-of-python-solutions-to.html
(But no parallel solutions were attempted).

Have fun programming!

- Paddy.



From paddy3118 at googlemail.com  Tue Feb 17 01:34:49 2009
From: paddy3118 at googlemail.com (Paddy)
Date: Mon, 16 Feb 2009 22:34:49 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <mailman.9571.1234720024.3487.python-list@python.org>
Message-ID: <d66c20b8-e54a-4f41-904a-3a826e53e232@v38g2000yqb.googlegroups.com>

On Feb 15, 5:46?pm, pyt... at bdurham.com wrote:
> What's the Pythonic way to determine if a string is a number? By
> number I mean a valid integer or float.
>
> I searched the string and cMath libraries for a similar function
> without success. I can think of at least 3 or 4 ways to build my
> own function.
>
> Here's what I came up with as a proof-of-concept. Are there
> 'better' ways to perform this type of test?
>
> Thanks,
> Malcolm
>
> <code>
> def isnumber( input ):
> ? ? try:
> ? ? ? ? if '.' in input:
> ? ? ? ? ? ? num = float( input )
> ? ? ? ? else:
> ? ? ? ? ? ? num = int( input )
> ? ? ? ? return True
>
> ? ? except ValueError:
> ? ? ? ? return False
>
> if __name__ == '__main__':
> ? ? tests = """
> ? ? ? ? 12
> ? ? ? ? -12
> ? ? ? ? -12.34
> ? ? ? ? .0
> ? ? ? ? .
> ? ? ? ? 1 2 3
> ? ? ? ? 1 . 2
> ? ? ? ? just text
> ? ? """
>
> ? ? for test in tests.split( '\n' ):
> ? ? ? ? print 'test (%0s), isnumber: %1s' % \
> ? ? ? ? ? ( test.strip(), isnumber( test ) )
>
> </code>

Their is a good answer given on Rosetta Code here:
  http://www.rosettacode.org/wiki/IsNumeric#Python

- Paddy.


From laplacian42 at gmail.com  Tue Feb 17 02:02:19 2009
From: laplacian42 at gmail.com (laplacian42 at gmail.com)
Date: Mon, 16 Feb 2009 23:02:19 -0800 (PST)
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
	<mailman.89.1234851668.11746.python-list@python.org>
Message-ID: <ea29bdf1-0bf7-433f-bc81-51a3202d2cd5@p20g2000yqi.googlegroups.com>

On Feb 17, 1:21?am, Python Nutter <pythonnut... at gmail.com> wrote:
> > Note: spelling is "OcempGUI". Also, since google broke some of the
> > links,
> > here's that main link again:
>
> Thats my bad or more to the point my iPhone bad, typing fast with
> spellcheck changes words to real dictionary words.
>
> > Well, to be fair, SDL is pretty commonly-used software and they offer
> > binary downloads for Mac OS X and MS Windows. Pygame seems to provide
> > the same. So, installation should be a breeze.
>
> Not on Mac. To get SDL, PyObjC, PyGame and other dependencies
> installed on the platform you are talking on downloading and
> installing close to 50MB+ of packages before you get to the point
> where you install the OcempGUI package.

Funny you should mention this. I'd just been getting it installed on a
Mac I have access to. Here's what it took:

1. Install a Python from python.org. Something about the Pygame
installer not wanting to use the system Python. Also, it wants v2.5.
Ok. (As an aside, that's about 19 MB.) This is a mpkg file in a dmg,
so the install is trivial.

2. Now SDL. This one is just a drag-and-drop to your `/Library/
Frameworks` folder. Easy, but the user will have to look into the
README to know what to do. (1 MB)

3. Now PyObjC. Another mpkg file. It's available at the pygame site.
(6 MB)

4. Pygame. An mpkg in a zip file. (9 MB)

5. Whoops. Surprise. NumPy is required. mpkg in a dmg. (3 MB)

6. Finally, OcempGUI. This is a `sudo python setup.py install`. (4 MB)

That's 42 MB all told, admin rights required, and the examples are
running. Pretty neat.

> Thats a lot to ask of a user

[sigh] Probably. Unless maybe all the prereq's were gathered together
with a script to run through and install them all one after another.

> just to run my one program on their
> system.

Well, it will allow them to run *any* OcempGUI program thereafter, but
I see your point.

> If it was just myself and I wanted to go through the process
> for educational/self-benefit I wouldn't mind. But TkInter is already installed (0 dependencies) and on every Mac out
> there

Just tried that. Didn't know it was all installed (Tcl/Tk too) and
ready to go. Wow that's pretty darn convenient.

> I also have this sneaking suspicion that the BDFL is secretly on the
> sidelines waiting for the Tk tile theming engine to mature as if it
> does and becomes standard in Python distributions I would say the
> justification for learning wx and qt would be diminished by an unknown
> quantity.
>

Aye.


From bj_666 at gmx.net  Tue Feb 17 02:26:28 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 17 Feb 2009 07:26:28 GMT
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <6vv754Flqs0mU1@mid.uni-berlin.de>

On Mon, 16 Feb 2009 23:21:16 -0600, Yuanxin Xi wrote:

> I'm having some problems with the memory recycling/garbage collecting of
> the following testing code:
> 
>>>> a=[str(i) for i in xrange(10000000)]
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
> 
>>>> b={}
>>>> for i in xrange(10000000):
> ...     b[str(i)]=i
> 
> Then the memory usage increased to 1726m/1.6g/2048
> 
>>>> del b
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
> 
> Could anyone please explain why this happens?  It seems some memory are
> not freed.

It seems the memory is not given back to the operating system.  This 
doesn't mean that it is not freed by Python and can't be used again by 
Python.  Create the dictionary again and see if the memory usage rises 
again or if it stays stable.

Ciao,
	Marc 'BlackJack' Rintsch


From testisok at gmail.com  Tue Feb 17 02:34:29 2009
From: testisok at gmail.com (testisok)
Date: Mon, 16 Feb 2009 23:34:29 -0800 (PST)
Subject: Thread control in thread pool for sending
Message-ID: <baad6eee-8e47-4df4-ad0f-c4c25681dd21@r15g2000prd.googlegroups.com>

Hi, all:

     Here is a thread pool for sending as a client, all blocked at
Semaphore.
     How can I choose these threads that is idle for some time and
then send heartbeat messages to the server thru sockets of these
threads?

Thanks in advance.
Best wishes


From regebro at gmail.com  Tue Feb 17 02:52:20 2009
From: regebro at gmail.com (Lennart Regebro)
Date: Tue, 17 Feb 2009 08:52:20 +0100
Subject: [Python-Dev] To 3.0.2 or not to 3.0.2?
In-Reply-To: <ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
References: <319e029f0902161108o5bb3506fq529525d35d0f35fe@mail.gmail.com>
	<ca471dc20902161550i4b092500j33ff7ad13736b169@mail.gmail.com>
Message-ID: <319e029f0902162352l13da07b8r8b0aafba66e4e7a3@mail.gmail.com>

On Tue, Feb 17, 2009 at 00:50, Guido van Rossum <guido at python.org> wrote:
> Can you explain the difficulty with porting setuptools in more detail?

Oh, it just exposes a bug in distutils. It probably means I'll have to
make a test for python version, and if it is 3.0.1, monkey-patch
distutils. I haven't really looked into if there is any other
possibilities yet, I'm concentrating to make it run for 3.1 trunk
first.

-- 
Lennart Regebro: Pythonista, Barista, Notsotrista.
http://regebro.wordpress.com/
+33 661 58 14 64


From grflanagan at gmail.com  Tue Feb 17 03:17:41 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 17 Feb 2009 08:17:41 +0000
Subject: flexible find and replace ?
In-Reply-To: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <gndrr6$c6f$1@ger.gmane.org>

OdarR wrote:
> Hi guys,
> 
> how would you do a clever find and replace, where the value replacing
> the tag
> is changing on each occurence ?
> 
> ".......TAG............TAG................TAG..........TAG....."
> 
> is replaced by this :
> 
> ".......REPL01............REPL02................REPL03..........REPL04..."
> 
> 
> A better and clever method than this snippet should exist I hope :
> 
> counter = 1
> while 'TAG' in mystring:
>     mystring=mystring.replace('TAG', 'REPL'+str(counter), 1)
>     counter+=1
>     ...
> 
> (the find is always re-starting at the string beginning, this is not
> efficient.
> 
> any ideas ? thanks,
> 

The first thing that comes to mind is re.sub:

import re

def replace(s, patt, repls):
     def onmatch(m):
         onmatch.idx += 1
         return repls[onmatch.idx]
     onmatch.idx = -1
     return patt.sub(onmatch, s)

test = """
abcTAG TAG asdTAGxyz
"""

REPLS = [
     'REPL1',
     'REPL2',
     'REPL3',
     ]

print replace(test, re.compile('TAG'), REPLS)



From duncan.booth at invalid.invalid  Tue Feb 17 03:18:12 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 08:18:12 GMT
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com>
Message-ID: <Xns9BB554614CFC8duncanbooth@127.0.0.1>

John Machin <sjmachin at lexicon.net> wrote:

> def fancyrepl(tag, replfunc, input_string):
>     count = 0
>     pieces = []
>     pos = 0
>     taglen = len(tag)
>     while 1:
>         try:
>             newpos = input_string.index(tag, pos)
>         except ValueError:
>             pieces.append(input_string[pos:])
>             return ''.join(pieces)
>         pieces.append(input_string[pos:newpos])
>         count += 1
>         pieces.append(replfunc(count))
>         pos = newpos + taglen
> 

Or even:

import re, itertools
def fancyrepl(tag, replfunc, input_string):
	counter = itertools.count(1)
	return re.sub(re.escape(tag),
         lambda m: replfunc(counter.next()), input_string)

which does exactly the same thing in rather less code.

-- 
Duncan Booth http://kupuguy.blogspot.com


From jldunn2000 at googlemail.com  Tue Feb 17 03:21:38 2009
From: jldunn2000 at googlemail.com (loial)
Date: Tue, 17 Feb 2009 00:21:38 -0800 (PST)
Subject: Get file name from file handle
Message-ID: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>

Is there anyway, having been passed a file handle, to get the
filename?

I am assuming not, but thought I would ask



From noprianto at gmail.com  Tue Feb 17 03:28:13 2009
From: noprianto at gmail.com (Noprianto)
Date: Tue, 17 Feb 2009 15:28:13 +0700
Subject: Get file name from file handle
In-Reply-To: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <8f0de1f0902170028r7d44da83p132e99a41dcbc68d@mail.gmail.com>

On 2/17/09, loial <jldunn2000 at googlemail.com> wrote:
>
> Is there anyway, having been passed a file handle, to get the
> filename?
>
> I am assuming not, but thought I would ask


>>> a = open('/etc/passwd')
>>> a.name
'/etc/passwd'
>>>

Best regards,
Nop
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From castironpi at gmail.com  Tue Feb 17 03:33:27 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Tue, 17 Feb 2009 00:33:27 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>

On Feb 16, 11:21?pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
> I'm having some problems with the memory recycling/garbage collecting
> of the following testing code:
>
> >>> a=[str(i) for i in xrange(10000000)]
>
> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>
> >>> b={}
> >>> for i in xrange(10000000):
>
> ... ? ? b[str(i)]=i
>
> Then the memory usage increased to 1726m/1.6g/2048
>
> >>> del b
>
> I expect the memory usage drop to the ammount before b was
> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
snip

'gc.collect()' -- I believe, but I'm not the specialist in it.



From gagsl-py2 at yahoo.com.ar  Tue Feb 17 03:34:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 06:34:46 -0200
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>
Message-ID: <op.uphl38cpx6zn5v@gabriel.sleipnir-bsas>

En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanvick at gmail.com> escribi?:
> On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
>> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>>
>> > I have a Python v2.5.2 server running and I found some undesirable
>> > behavior in the xmlrpclib module that is included with that version of
>> > Python. ?The xmlrpclib version that is included with Python 2.6
>> > changes the behavior for the better. ?I nervous about upgrading my
>> > Python install to 2.6 on this server because I remember reading in the
>> > docs of a library I use that it targets the 2.5 branch. ?What is the
>> > best way to only upgrade the xmlrpclib in my 2.5 install?
>> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
>> and 2.6, only significant differences I see are checks for True/False
>> as builtins left over from pre-2.4 and some datetime handling.
> The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
> custom objects.  It checks the type of my object, and if it isn't in a
> hard-coded list of types, then a "Cannot marshal object of <type>
> type" exception message shows up.  The version in my Windows 2.6
> install has a fall back case where if the type is not in the hard-
> coded list, it simply calls Object.__dict__ to get a graph of the
> object's values that can be marshaled into xmlrpc.
>
> I am using xmlrpc through Pylons.  As a workaround, instead of
> returning my custom objects in my xmlrpc server functions, I return
> MyObject.__dict__
>
> I also did not see anything in the revision log in the source file
> about this change.

It was rev.52790: http://svn.python.org/view?rev=52790&view=rev
The tracker item has some background: http://bugs.python.org/issue1070046

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Feb 17 03:40:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 17 Feb 2009 00:40:29 -0800
Subject: memory recycling/garbage collecting problem
In-Reply-To: <b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
Message-ID: <50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>

On Tue, Feb 17, 2009 at 12:33 AM, Aaron Brady <castironpi at gmail.com> wrote:
> On Feb 16, 11:21 pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
>> I'm having some problems with the memory recycling/garbage collecting
>> of the following testing code:
>>
>> >>> a=[str(i) for i in xrange(10000000)]
>>
>> This takes 635m/552m/2044 memory (VIRT/RES/SHR)
>>
>> >>> b={}
>> >>> for i in xrange(10000000):
>>
>> ...     b[str(i)]=i
>>
>> Then the memory usage increased to 1726m/1.6g/2048
>>
>> >>> del b
>>
>> I expect the memory usage drop to the ammount before b was
>> created(635m/552m/2044), but it's actually 1341m/1.2g/2048
> snip
>
> 'gc.collect()' -- I believe, but I'm not the specialist in it.

If I understand correctly, that only effects objects that are part of
a reference cycle and doesn't necessarily force the freed memory to be
released to the OS.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From grflanagan at gmail.com  Tue Feb 17 03:49:25 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 17 Feb 2009 08:49:25 +0000
Subject: flexible find and replace ?
In-Reply-To: <gndrr6$c6f$1@ger.gmane.org>
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<gndrr6$c6f$1@ger.gmane.org>
Message-ID: <gndtml$i5j$1@ger.gmane.org>

Gerard Flanagan wrote:
> 
> def replace(s, patt, repls):
>     def onmatch(m):
>         onmatch.idx += 1
>         return repls[onmatch.idx]
>     onmatch.idx = -1
>     return patt.sub(onmatch, s)
> 

> test = """
> abcTAG TAG asdTAGxyz
> """
> 
> REPLS = [
>     'REPL1',
>     'REPL2',
>     'REPL3',
>     ]
> 
> print replace(test, re.compile('TAG'), REPLS)
> 
> -- 

or better:

import re

def replace(s, patt, repls):
     repls = iter(repls)
     return patt.sub(lambda m: repls.next(), s)

test = """
abcTAG TAG asdTAGxyz
"""

def repls(tag):
     i = 0
     while True:
         i += 1
         yield tag + str(i)

print replace(test, re.compile('TAG'), repls('REPL'))



From duncan.booth at invalid.invalid  Tue Feb 17 03:55:54 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 08:55:54 GMT
Subject: Get file name from file handle
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <Xns9BB55AC4F7A27duncanbooth@127.0.0.1>

loial <jldunn2000 at googlemail.com> wrote:

> Is there anyway, having been passed a file handle, to get the
> filename?
> 
> I am assuming not, but thought I would ask
> 
> 
If you mean a Python file object then file.name (but it may not exist on 
all file objects).

If you mean a system file handle, then which filename would you like? On 
many filesystems the file exists independantly from the filenames, so a 
single file can have many names or none at all. On Linux you can use 
os.fstat() to get the inode number for the file but I think you would have 
to scan the relevant directories to find the names associated with the 
inode.

-- 
Duncan Booth http://kupuguy.blogspot.com


From mirko.dziadzka at gmail.com  Tue Feb 17 04:03:29 2009
From: mirko.dziadzka at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 10:03:29 +0100
Subject: print string as raw string
Message-ID: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>

Hi all

I'm trying to find a way to output strings in the raw-string format, e.g.

print_as_raw_string(r"\.") should output r"\." instead of "\\."

Is there a better way than writing your own print function? Some magic
encoding?


    Mirko



From tim.wintle at teamrubber.com  Tue Feb 17 04:05:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 17 Feb 2009 09:05:49 +0000
Subject: Speedup Bitmap Parser
In-Reply-To: <12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
Message-ID: <1234861549.6114.9.camel@tim-laptop>

On Mon, 2009-02-16 at 16:47 -0800, bearophileHUGS at lycos.com wrote:
> Jayson Santos:
> > Do I need use some patters or others progamming conventions ?
> 
> That's a strong question...
> Knowing OOP well is important, and it's often a good way to program,
> etc. But... You may try to rewrite your code with functions only and
> no classes (well, you may need to use classes for the TK gui).
> Feel free to not follow this suggestion of mine. Even if you follow
> it, it will not damage your brain :-)

I'd strongly agree with the above - object creation is overkill in
inner-loops.

Invoking functions and any kind of variable allocation is also going to
slow it down. That's what bearophile's previous comment about accessing
line.colors without the "." lookup by enumerating them was about.

At the end of the day, image manipulation is often better left to C (or
compiled extensions to python in Cython etc.) than done in Python - it's
just too tough to do pointer-magic in Python. You may find that so much
time is being spent by your application in the ".create_line" method
that there's no other option - I'd highly recommend PIL though.


Tim Wintle



From bieffe62 at gmail.com  Tue Feb 17 04:15:40 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Tue, 17 Feb 2009 01:15:40 -0800 (PST)
Subject: Get file name from file handle
References: <b2f1d2aa-ae0a-43da-a25b-bbec710fc99f@p20g2000yqi.googlegroups.com>
Message-ID: <9ccf2d4f-6c5e-49a0-b0c2-905f246e9cc9@r41g2000yqm.googlegroups.com>

On Feb 17, 9:21?am, loial <jldunn2... at googlemail.com> wrote:
> Is there anyway, having been passed a file handle, to get the
> filename?
>
> I am assuming not, but thought I would ask

If by file handle you mean the object returned by 'file' and 'open'
functions, it has a name attribute.
If by file handle you mean the file descriptor, i.e. the integer used
for low level I/O, then there is no
way I know of. I believe that number is an index in an array of 'file
descriptors' somewhere inside the
C library ( below python interpreter level ), but I don't know if/how
an user program can access it.

Ciao
----
FB


From mail at microcorp.co.za  Tue Feb 17 04:18:36 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 17 Feb 2009 11:18:36 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
Message-ID: <014201c990e2$fb49dba0$0d00a8c0@hendrik>

"Aahz" <aahz at py....aft.com> wrote:


> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <ma....orp.co.za> wrote:
> >
> >Occam was the language that should have won the marketing prize, but
> >didn't.
> 
> It wasn't simple enough.

I thought (at the time) that it was quite good at hiding some
horrible complexities of communication between different
processes on the same, and different processors.

All done by the compiler, automagically.

I think now that a hard look at the underlying techniques
used then could add something to the debate referred to
earlier - but there may be a barrier because the dataflow
or systolic array type programming model is not one
that is currently fashionable.

- Hendrik




From bearophileHUGS at lycos.com  Tue Feb 17 04:27:04 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 01:27:04 -0800 (PST)
Subject: pythonic array subsetting
References: <mailman.88.1234851441.11746.python-list@python.org>
Message-ID: <32c50024-2bb3-4fd4-bedb-c995e4ce97cb@f3g2000yqf.googlegroups.com>

Nick Matzke:
> I have to do this hundreds of times, so speed would be useful.

Try to create a 2D array with NumPy, and then slice it. Note that
slicing syntax has a "stride" too.

Bye,
bearophile


From mail at microcorp.co.za  Tue Feb 17 04:27:54 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Tue, 17 Feb 2009 11:27:54 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org><gndb96$97u$1@panix3.panix.com>
	<87fxidohk6.fsf@benfinney.id.au>
Message-ID: <014301c990e2$fbe0eb80$0d00a8c0@hendrik>

"Ben Finney" <bignose+hates-spam at benfinney.id.au> wrote:

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.52.1234797812.11746.python-list at python.org>,
> Hendrik van Rooyen <mail at microcorp.co.za> wrote:
> >Occam was the language that should have won the marketing prize,
> >but didn't.
> 
> It wasn't simple enough.

*bdom-tsssh* <URL:http://en.wikipedia.org/wiki/Occam's_razor>

If Aahz was trolling, then he got me. I know about William of Occam,
after whom the language was named, and his razor, but did not make
the association, and answered seriously.

If you play with razor blades, you get cut.
:-)

- Hendrik




From gagsl-py2 at yahoo.com.ar  Tue Feb 17 05:05:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 08:05:42 -0200
Subject: Need an application sends from paricular port
References: <9e680b420902112148r75abe35emb629d2d9ddb33b9c@mail.gmail.com>
	<9e680b420902162144o69e86806wd80383579e21d333@mail.gmail.com>
Message-ID: <op.uphqbsj3x6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 03:44:51 -0200, Sambit Samal <sambit2005 at gmail.com>  
escribi?:

>> I am new to Python world
>>
>>  I need a python script , which binds at a user defind port & sends to
>> other enity , which waits at particular port.
>> The other enity will respond & Python script should receive that at the
>> defined port
>>
>> The communication will happen over UDP

(I'm rather sure I replied to your first request, but I cannot find my own  
post anywhere, so I'll try again)

See the SocketServer module:  
http://docs.python.org/library/socketserver.html -- you may want to use  
ForkingUDPServer or ThreadingUDPServer. There is a client/server example  
at the end.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Feb 17 05:17:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 08:17:37 -0200
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
Message-ID: <op.uphqvne6x6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 03:04:23 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> io.TextIOWrapper object; but I want to output bytes
>   (e.g. muscript -midi t > t.mid )
> and they're coming out stringified :-(  How can I either change the
> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> mode, or dup(fd) it first, or whatever the right thing to do is ?

I cannot test this with Python 3 right now, but I think this should work  
(right at the start of your script):

sys.stdout = os.fdopen(sys.stdout.fileno(), 'wb')

-- 
Gabriel Genellina



From tino at wildenhain.de  Tue Feb 17 05:33:56 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Tue, 17 Feb 2009 11:33:56 +0100
Subject: print string as raw string
In-Reply-To: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <499A9294.2050505@wildenhain.de>

Mirko Dziadzka wrote:
> Hi all
> 
> I'm trying to find a way to output strings in the raw-string format, e.g.
> 
> print_as_raw_string(r"\.") should output r"\." instead of "\\."
> 
> Is there a better way than writing your own print function? Some magic
> encoding?

Thats nonsense. print r"\." or in python3.0 print(r"\.")
will just print:
\.

Regards
Tino
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From deets at nospam.web.de  Tue Feb 17 05:39:48 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 11:39:48 +0100
Subject: print string as raw string
In-Reply-To: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <6vvifkFm4k0vU1@mid.uni-berlin.de>

Mirko Dziadzka schrieb:
> Hi all
> 
> I'm trying to find a way to output strings in the raw-string format, e.g.
> 
> print_as_raw_string(r"\.") should output r"\." instead of "\\."
> 
> Is there a better way than writing your own print function? Some magic
> encoding?

There is no need to do this. Rawstrings are only different wrt to their 
parsing, the resulting string is the exact same.

r"\foo" == "\\foo"
type(r"\foo") == type("\\foo")

So there is no way to write something that distinguishes them.


Can it be that you are fooled by the repr() of strings in the interpreter?

 >>> r"\foo"
'\\foo'

This is nothing to worry about, it's just the interpreter doing an 
implicit repr-call for the objects it displays.

If instead you'd do

 >>> print r"\foo"
\foo

you get what you want.


Diez


From andrew at acooke.org  Tue Feb 17 06:34:39 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 08:34:39 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <014201c990e2$fb49dba0$0d00a8c0@hendrik>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><977bad202990de5797c2efcf8d50ed81.squirrel@localhost><mailman.52.1234797812.11746.python-list@python.org>
	<gndb96$97u$1@panix3.panix.com>
	<014201c990e2$fb49dba0$0d00a8c0@hendrik>
Message-ID: <ee0b0a41ff92bd2f900391860eaad09c.squirrel@localhost>


why do you think that current work is ignorant of occam?  occam itself was
based on hoare's "communicating sequential processes" which is a classic
of the field.  the ideas behind occam are not unknown and it hasn't been
forgotten (there are many libraries based on synchronous message passing;
one for java called jcsp for example -
http://www.cs.kent.ac.uk/projects/ofa/jcsp/ ; the "rendezvous model"
(receiving tasks wait for messages) is used in ada).

but really it did very little to hide the complexities of parallel
computing - it's famous because it (and the transputer platform) was one
of the first languages to take parallelism "seriously", not because it
presented any kind of silver bullet (more generally, it was a pretty crude
language, more suited to small embedded applications than large projects -
it didn't even have dynamically sized arrays)

there's a comment here http://lambda-the-ultimate.org/node/2437 that shows
the limitations of occam: "I used Occam (the transputer implementation of
CSP) very heavily in the 1980s and early 1990s, and eventually started
referring to channels as "the return of the GOTO", since in any moderately
complex application, you spent a lot of time wondering, "If I put bytes in
*here*, who will they go to?" Addressable actors and/or tuple spaces both
felt much more scalable (in the coding sense)."

(disclaimer - i haven't used it personally.  once i was asked to maintain
an occam system, but somehow managed to dodge the responsibility)

if you look at erlang, which is one of the more successful parallel
languages at the moment, you'll see some similarity to occam (message
passing is explicit), but shifting to asynchronous messages helps give a
more robust system.

andrew


Hendrik van Rooyen wrote:
> "Aahz" <aahz at py....aft.com> wrote:
>
>
>> In article <mailman.52.1234797812.11746.python-list at python.org>,
>> Hendrik van Rooyen <ma....orp.co.za> wrote:
>> >
>> >Occam was the language that should have won the marketing prize, but
>> >didn't.
>>
>> It wasn't simple enough.
>
> I thought (at the time) that it was quite good at hiding some
> horrible complexities of communication between different
> processes on the same, and different processors.
>
> All done by the compiler, automagically.
>
> I think now that a hard look at the underlying techniques
> used then could add something to the debate referred to
> earlier - but there may be a barrier because the dataflow
> or systolic array type programming model is not one
> that is currently fashionable.
>
> - Hendrik
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From bruno.42.desthuilliers at websiteburo.invalid  Tue Feb 17 06:38:43 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 17 Feb 2009 12:38:43 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <499aa1bb$0$29487$426a74cc@news.free.fr>

rushenaly at gmail.com a ?crit :
(snip)
> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. 

I'm surprised no one here corrected that point yet, so here we go: yes, 
Python does support multithreading. The fact that threads won't be 
executed concurrently on a multicore machine (due to the GIL) is a 
different problem (cf Andrew Cooke's answer on this - and his advice to 
study Erlang if you want to do concurrent programming).



From mirko-usenet-200902 at gmail.com  Tue Feb 17 06:54:01 2009
From: mirko-usenet-200902 at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 12:54:01 +0100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
Message-ID: <slrngpl9ap.5jn.mirko-usenet-200902@dziadzka.de>

Diez B. Roggisch <deets at nospam.web.de>  wrote:
>> I'm trying to find a way to output strings in the raw-string format, e.g.
>> 
>> print_as_raw_string(r"\.") should output r"\." instead of "\\."
>> 
>> Is there a better way than writing your own print function? Some magic
>> encoding?
>
> There is no need to do this. Rawstrings are only different wrt to their 
> parsing, the resulting string is the exact same.

I know. 

Maybe a little bit more eplaination from my site.  I'm going to generate
python source which contains lot of regex-strings and I want this code
to be easy readable and editable. 
In fact, editing these regexes is the main reason for exporting them.  

So I would prefer the more compact and readable raw-string notation
instead of the smantic equivalent string notation.

So I'm going to write these couple of lines to convert a string in this
raw-string format.

Greetings

    Mirko


-- 
"In C we had to code our own bugs. In C++ we can inherit them."  


From andrew at acooke.org  Tue Feb 17 06:58:38 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 08:58:38 -0300 (CLST)
Subject: Will multithreading make python less popular?
In-Reply-To: <499aa1bb$0$29487$426a74cc@news.free.fr>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<499aa1bb$0$29487$426a74cc@news.free.fr>
Message-ID: <860a74f95b30bd61dfa6240dc70bbf9e.squirrel@localhost>

Bruno Desthuilliers wrote:
> rushenaly at gmail.com a ?crit :
> (snip)
>> And the story begins here. As i search on the net,  I have found that
>> because of the natural characteristics of python such as GIL, we are
>> not able to write multi threaded programs.
>
> I'm surprised no one here corrected that point yet, so here we go: yes,
> Python does support multithreading. The fact that threads won't be
> executed concurrently on a multicore machine (due to the GIL) is a
> different problem (cf Andrew Cooke's answer on this - and his advice to
> study Erlang if you want to do concurrent programming).

ah, sorry, i noticed this last night in another comment from rushenaly,
but forgot to say anything.

in case it's still not clear: you can have threads even on a single core. 
this is done by "time slicing" - some cpu time is given to one thread,
then to another.

exactly who does the slicing can vary.  in the case of a gui (which is
what i was about to explain last night then got distracted) it's quite
common for the gui library itself to do the scheduling of work.  so even
though the gui library uses a single thread, it can update several
windows, handle user input, etc "in parallel".  the next level is that the
language itself does the scheduling - that's what is commonly called
"threads".  finally the operating system can share things out (and that's
called processes).  but these are all basically the same thing, can happen
on a single core, and are not affected by the GIL (i have simplified
above; threads can also be a service that the operating system provides to
a language)

andrew




From mirko.dziadzka at gmail.com  Tue Feb 17 07:03:16 2009
From: mirko.dziadzka at gmail.com (Mirko Dziadzka)
Date: Tue, 17 Feb 2009 13:03:16 +0100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
Message-ID: <slrngpl9s4.612.mirko-usenet-200902@dziadzka.de>

Mirko Dziadzka <mirko.dziadzka at gmail.com>  wrote:
> Hi all
>
> I'm trying to find a way to output strings in the raw-string format, e.g.
>
> print_as_raw_string(r"\.") should output r"\." instead of "\\."

Ok, lets make a better example:

>>> re_list = {}
>>> re_list['foo'] = r'\..*'
>>> re_list['bar'] = r'.*bar.*'
>>> print re_list
{'foo': '\\..*', 'bar': '.*bar.*'}

I would like to see a:
{'foo': r'\..*', 'bar': '.*bar.*'}


Greetings

    Mirko


-- 
"Never attribute to malice what can be equally explained by stupidity." 


From steve at pearwood.info  Tue Feb 17 07:09:50 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:09:50 +1100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
Message-ID: <01aa9ea5$0$20632$c3e8da3@news.astraweb.com>

Nicolas Dandrimont wrote:

> I would go for something like:
> 
> for char in word:
>     if char in 'aeiouAEIUO':
>         char_found = True
>         break
> else:
>     char_found = False
> 
> (No, I did not forget to indent the else statement, see
> http://docs.python.org/reference/compound_stmts.html#for)

That might be better written as:

char_found = False
for char in word:
    if char in 'aeiouAEIUO':
        char_found = True
        break

or even:

char_found = False
for char in word:
    if char.lower() in 'aeiou':
        char_found = True
        break

but if word is potentially very large, it's probably better to reverse the
test: rather than compare every char of word to see if it is a vowel, just
search word for each vowel:

char_found = any( vowel in word for vowel in 'aeiouAEIOU' )

This moves the for-loop out of slow Python into fast C and should be much,
much faster for very large input.


-- 
Steven



From steve at pearwood.info  Tue Feb 17 07:21:16 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:21:16 +1100
Subject: print string as raw string
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
Message-ID: <01aaa153$0$20629$c3e8da3@news.astraweb.com>

Diez B. Roggisch wrote:

> Mirko Dziadzka schrieb:
>> Hi all
>> 
>> I'm trying to find a way to output strings in the raw-string format, e.g.
>> 
>> print_as_raw_string(r"\.") should output r"\." instead of "\\."
>> 
>> Is there a better way than writing your own print function? Some magic
>> encoding?
> 
> There is no need to do this. 

How do you know? Perhaps the OP is writing a test suite where he needs to
confirm that tens of thousands of raw strings are converted correctly, and
he'd rather write a Python script to generate those raw strings than to
type them up by hand. In this case though, the OP would be better off
generating the raw strings systematically, rather than trying to go
backwards.

In any case, this is just a variation of what repr() does.

>>> repr(r'\.')
"'\\\\.'"

What the OP seems to want is something like:

>>> raw_repr('\\\\.')  # or r'\.' or '\x5c.' etc.
"r'\.'"


I don't think that's necessarily a silly function to have, although what it
is useful for (apart from my contrived example above), I don't know.

Here is a barely tested version:

def raw_repr(s):
    """Return the repr of string s as a raw-string."""
    r = repr(s)
    if '\\\\' in r:
        r = "r" + r.replace('\\\\', '\\')
    assert not r.endswith('\\')
    return r


>>> raw_repr('\x5c.')
"r'\\.'"
>>> print raw_repr('\x5c.')
r'\.'



-- 
Steven



From steve at pearwood.info  Tue Feb 17 07:23:32 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 17 Feb 2009 23:23:32 +1100
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
Message-ID: <01aaa1da$0$20629$c3e8da3@news.astraweb.com>

Roy Smith wrote:

>> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
>> > and SyntaxError?
> 
> Absolutely.  Let's take my example -- you're writing software for a Mars
> Rover.  I have no idea how you might get a MemoryError, but let's say you
> do.  Which would you rather do, perform a system reset, or print a stack
> trace and wait for a friendly Martian to come along and reboot you?
> 
> You may think I'm being silly, but I'm dead serious.  The many layers of
> "It's impossible for this to happen, but if it does let's do something to
> try and recover" processing saved that mission several times over.  In
> some applications, there's no such thing as "halt".

Okay, but that surely falls under chapter 18 of the "Advanced Python
Programming for the Mars Rover" book rather than chapter 5 of "Newbies
Guide to Python".

In general, the right thing to do for unexpected exemptions is to let them
halt the program so you can find out about them and fix the bug, not to
hide the exception. There may be exceptions (pun intended) to this general
principle, but they're fairly unusual.


-- 
Steven



From newptcai at gmail.com  Tue Feb 17 07:27:25 2009
From: newptcai at gmail.com (=?GB2312?B?0rvK18qr?=)
Date: Tue, 17 Feb 2009 04:27:25 -0800 (PST)
Subject: Is there something easier than ORM?
Message-ID: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>

Hi all,

Recently I am studying some python ORM libraries, such as sqlalchemy.

These are very powerful technologies to handle database.  But I think
my project are not complicated to enough to benefit from a complete
ORM system.

What I really want, is some easy ways to load data from database, and
change rows of data to list of named tuple, then I could send these
data to my client application.

I don't think I want these subtle behavior such as lazy load, auto
update, ect. in ORM.

So is there some libraries like that?

Or is there some tools that could generate code from database scheme
as I want?


From lists at cheimes.de  Tue Feb 17 07:28:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 13:28:01 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <slrngpkhao.3ri.peter@box8.pjb.com.au>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
Message-ID: <gneagh$s38$1@ger.gmane.org>

Peter Billam schrieb:
> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> io.TextIOWrapper object; but I want to output bytes
>   (e.g. muscript -midi t > t.mid )
> and they're coming out stringified :-(  How can I either change the
> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> mode, or dup(fd) it first, or whatever the right thing to do is ?

The official API to write binary data to stdout is:

>>> count = sys.stdout.buffer.write(b"abc\n")
abc

Christian



From smartpawn at gmail.com  Tue Feb 17 07:31:38 2009
From: smartpawn at gmail.com (Deepak Rokade)
Date: Tue, 17 Feb 2009 18:01:38 +0530
Subject: listing files by modification time
Message-ID: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>

Hi,

I am using python 2.5 on sun solaris.

I want to limit the number of files returned by os.listdir() to some number
(say 1000), how can I do it ?

Also I wan to list the files only if they are older than some x days, how
can I do it?

I can do this through shell script using command.



find ${ DIR_PATH} -mtime +`expr ${PERIOD} - 1` -type f -exec ls  -l {} \;



I want to have similar functionality like above through python. I don't want
to list the whole files in directory and go to each file for checking it's
modification time.

I am thankful for any pointer.


-- 
Thanx & Regards,
Deepak Rokade

Do what u Enjoy &
               Enjoy what u Do...........
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From clp2 at rebertia.com  Tue Feb 17 07:36:52 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 17 Feb 2009 04:36:52 -0800
Subject: listing files by modification time
In-Reply-To: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
Message-ID: <50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:31 AM, Deepak Rokade <smartpawn at gmail.com> wrote:
> Hi,
>
> I am using python 2.5 on sun solaris.
>
> I want to limit the number of files returned by os.listdir() to some number
> (say 1000), how can I do it ?
>
> Also I wan to list the files only if they are older than some x days, how
> can I do it?

You can filter the returned list of files by checking the results of
os.stat() [http://docs.python.org/library/os.html#os.stat] on the
files. The `stat` module [http://docs.python.org/library/stat.html]
can help with the interpretation of the data returned from os.stat().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From n.kottiyath at gmail.com  Tue Feb 17 07:40:33 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Tue, 17 Feb 2009 04:40:33 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <f4397092-2258-4cee-af5e-4dee5cea995a@w39g2000prb.googlegroups.com>



??? wrote:
> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

If ORM is not used, you might have to contend with different tools for
different databases - and will have to write SQL commands.
Luckily everything follows DB-API2 properly. http://www.python.org/dev/peps/pep-0249/.
So you mostly dont have to change the commands to access DB.

For the different tools, this http://wiki.python.org/moin/DatabaseInterfaces
might be a good starting point.
For example - psycopg2 for postgresql is almost the default etc.


From sjmachin at lexicon.net  Tue Feb 17 08:02:34 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 17 Feb 2009 05:02:34 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
	<1903b4e6-0ea1-4e34-a6af-2d69b6d75a72@i20g2000prf.googlegroups.com> 
	<Xns9BB554614CFC8duncanbooth@127.0.0.1>
Message-ID: <917e504a-47dc-4ac3-b2ae-72d5cfb6d7df@m29g2000prd.googlegroups.com>

On Feb 17, 7:18?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> John Machin <sjmac... at lexicon.net> wrote:
> > def fancyrepl(tag, replfunc, input_string):
> > ? ? count = 0
> > ? ? pieces = []
> > ? ? pos = 0
> > ? ? taglen = len(tag)
> > ? ? while 1:
> > ? ? ? ? try:
> > ? ? ? ? ? ? newpos = input_string.index(tag, pos)
> > ? ? ? ? except ValueError:
> > ? ? ? ? ? ? pieces.append(input_string[pos:])
> > ? ? ? ? ? ? return ''.join(pieces)
> > ? ? ? ? pieces.append(input_string[pos:newpos])
> > ? ? ? ? count += 1
> > ? ? ? ? pieces.append(replfunc(count))
> > ? ? ? ? pos = newpos + taglen
>
> Or even:
>
> import re, itertools
> def fancyrepl(tag, replfunc, input_string):
> ? ? ? ? counter = itertools.count(1)
> ? ? ? ? return re.sub(re.escape(tag),
> ? ? ? ? ?lambda m: replfunc(counter.next()), input_string)
>
> which does exactly the same thing

Not exactly; mine needs
    taglen = max(1, len(tag))
to stop an infinite loop when len(tag) == 0.

> in rather less code.

and with rather less execution speed [measured at about half] and
rather less OP-explanation speed [guessed] :-)


From deets at nospam.web.de  Tue Feb 17 08:24:43 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 14:24:43 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <6vvs4rFlvitlU1@mid.uni-berlin.de>

??? schrieb:
> Hi all,
> 
> Recently I am studying some python ORM libraries, such as sqlalchemy.
> 
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
> 
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
> 
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
> 
> So is there some libraries like that?
> 
> Or is there some tools that could generate code from database scheme
> as I want?


Sqlalchemy. You don't need to use the ORM-layer, and you can use 
reflection to create schema-objects like tables.

Then you can use that to create SQL-queries simple & powerful, whilst 
being DB-agnostic and having a road to start using the ORM if you 
discover it is useful for you.

To be honest: if you can control the schema, I'd still go for an orm. I 
for example use elixir. It makes the easy things *really* easy, and the 
complicated ones ar still possible.


Diez


From michele.simionato at gmail.com  Tue Feb 17 08:37:43 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 05:37:43 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <2aadd0f4-37a8-4e65-a447-4ef1f44eba74@v39g2000yqm.googlegroups.com>

On Feb 17, 1:27 pm, ??? <newpt... at gmail.com> wrote:
> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

I think there is room for a poor man toolkit, something in between
SQLAlchemy and raw DB API.
However, I am not aware of any, and for the moment I am using a custom
made solution.


From santosdosreis at gmail.com  Tue Feb 17 08:47:07 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Tue, 17 Feb 2009 05:47:07 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
Message-ID: <5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>

On 16 fev, 21:47, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > Do I need use some patters or others progamming conventions ?
>
> That's a strong question...
> Knowing OOP well is important, and it's often a good way to program,
> etc. But... You may try to rewrite your code with functions only and
> no classes (well, you may need to use classes for the TK gui).
> Feel free to not follow this suggestion of mine. Even if you follow
> it, it will not damage your brain :-)
>
> Bye,
> bearophile

Hello bearophile,
Thank you for all.
After changing my code to use only functions instead classes my code
is too much faster.
Here cProfile statistcs:
Using old code : 633608 function calls in 1.361 CPU seconds
Using new code: 475487 function calls in 0.800 CPU seconds

Best Regards
Jayson Reis


From stef.mientki at gmail.com  Tue Feb 17 08:58:24 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 17 Feb 2009 14:58:24 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable )  ?
Message-ID: <499AC280.80103@gmail.com>

hello,

I'm making a virtual machine,
in which (small) pieces of software (called bricks) are connected,
by connecting an output of a brick to the input of another brick.

A connection between 2 bricks may be of any type,
so it might be simple integer,
or a multi-nested dictionary / list or whatsoever .

Connections are made with the following statement (in simplified form)

Brick2.In = Brick2.Out

Now if the connection is a complex object, e.g. a list,
Brick2.In and Brick2.Out points to the same object,
and can automatically exchange information.

Now if the connection consists of a simple integer,
the statement Brick2.In = Brick2.Out
just assigns once a value to Brick2,
so there's no real communication anymore.
I solved that by adding modify-flags and receiver lists.

The problem is how can I determine
if a connection is a pointer or not ?
Which I'm not sure might be the same as mutable ?
( The type of connection need not be a standard Python type,
but might be any type created by the user. )

thanks,
Stef Mientki





From tim.wintle at teamrubber.com  Tue Feb 17 09:10:26 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 17 Feb 2009 14:10:26 +0000
Subject: memory recycling/garbage collecting problem
In-Reply-To: <50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
Message-ID: <1234879826.7672.11.camel@tim-laptop>

On Tue, 2009-02-17 at 00:40 -0800, Chris Rebert wrote: 
> >
> > 'gc.collect()' -- I believe, but I'm not the specialist in it.
> 
> If I understand correctly, that only effects objects that are part of
> a reference cycle and doesn't necessarily force the freed memory to be
> released to the OS.

I believe that's correct.

If the OP is worrying about memory usage then they should also be aware
that there are lots of very clever things done pre-assigning and keeping
hold of memory with python's in-built types to let them scale well that
can be confusing when you're looking at memory usage.

Basically malloc() and free() are computationally expensive, so Python
tries to call them as little as possible - but it's quite clever at
knowing what to do - e.g. if a list has already grown large then python
assumes it might grow large again and keeps hold of a percentage of the
memory.

The outcome is that trying to reduce memory usage can change what data
structures you should use - tupples use less space than lists, etc.

Tim W



From newptcai at gmail.com  Tue Feb 17 09:15:33 2009
From: newptcai at gmail.com (=?UTF-8?B?5LiA6aaW6K+X?=)
Date: Tue, 17 Feb 2009 06:15:33 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
Message-ID: <70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>

Thanks for your reply.

With sqlalchemy, an mapped must living in a session, you have no way
to disconnect it with its session.

For example :

#-------------------------------------
user = session.query(User).first()
session.expunge(user)
print user.name   #Error here
#-------------------------------------

I just want to get an read-only copy of user disconnected with session
to avoid  unexpected database operation.
But after expunge, properties of user is not accessible anymore.

BTW : why you choose elixir instead of sqlalchemy's own schema
definition style?
Doesn't including another library means more chances of bugs?

On Feb 17, 9:24?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> ??? schrieb:
>
>
>
> > Hi all,
>
> > Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> > These are very powerful technologies to handle database. ?But I think
> > my project are not complicated to enough to benefit from a complete
> > ORM system.
>
> > What I really want, is some easy ways to load data from database, and
> > change rows of data to list of named tuple, then I could send these
> > data to my client application.
>
> > I don't think I want these subtle behavior such as lazy load, auto
> > update, ect. in ORM.
>
> > So is there some libraries like that?
>
> > Or is there some tools that could generate code from database scheme
> > as I want?
>
> Sqlalchemy. You don't need to use the ORM-layer, and you can use
> reflection to create schema-objects like tables.
>
> Then you can use that to create SQL-queries simple & powerful, whilst
> being DB-agnostic and having a road to start using the ORM if you
> discover it is useful for you.
>
> To be honest: if you can control the schema, I'd still go for an orm. I
> for example use elixir. It makes the easy things *really* easy, and the
> complicated ones ar still possible.
>
> Diez



From smartpawn at gmail.com  Tue Feb 17 09:16:07 2009
From: smartpawn at gmail.com (Deepak Rokade)
Date: Tue, 17 Feb 2009 19:46:07 +0530
Subject: listing files by modification time
In-Reply-To: <50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
	<50697b2c0902170436v3704add2gb1cab410607f7bdf@mail.gmail.com>
Message-ID: <48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>

Yes I can do that but for that I will have to go through entire list of
files and also I will have to first get the whole list of files present in
directory.

In case of my application this list can be huge and so want to list the
files which suits my criteria.
Similar to the unix find command I sent earlier or like below.

find /  -mtime +5 -type f -exec ls  -l {} \;

Otherwise can I limit the number of files in a list returned by os.listdir()
?



On Tue, Feb 17, 2009 at 6:06 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Tue, Feb 17, 2009 at 4:31 AM, Deepak Rokade <smartpawn at gmail.com>
> wrote:
> > Hi,
> >
> > I am using python 2.5 on sun solaris.
> >
> > I want to limit the number of files returned by os.listdir() to some
> number
> > (say 1000), how can I do it ?
> >
> > Also I wan to list the files only if they are older than some x days, how
> > can I do it?
>
> You can filter the returned list of files by checking the results of
> os.stat() [http://docs.python.org/library/os.html#os.stat] on the
> files. The `stat` module [http://docs.python.org/library/stat.html]
> can help with the interpretation of the data returned from os.stat().
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>



-- 
Thanx & Regards,
Deepak Rokade

Do what u Enjoy &
               Enjoy what u Do...........
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From deets at nospam.web.de  Tue Feb 17 09:17:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 17 Feb 2009 15:17:33 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable
	)  ?
In-Reply-To: <mailman.109.1234879101.11746.python-list@python.org>
References: <mailman.109.1234879101.11746.python-list@python.org>
Message-ID: <6vvv7tFlvv6jU1@mid.uni-berlin.de>

Stef Mientki schrieb:
> hello,
> 
> I'm making a virtual machine,
> in which (small) pieces of software (called bricks) are connected,
> by connecting an output of a brick to the input of another brick.
> 
> A connection between 2 bricks may be of any type,
> so it might be simple integer,
> or a multi-nested dictionary / list or whatsoever .
> 
> Connections are made with the following statement (in simplified form)
> 
> Brick2.In = Brick2.Out
> 
> Now if the connection is a complex object, e.g. a list,
> Brick2.In and Brick2.Out points to the same object,
> and can automatically exchange information.
> 
> Now if the connection consists of a simple integer,
> the statement Brick2.In = Brick2.Out
> just assigns once a value to Brick2,
> so there's no real communication anymore.
> I solved that by adding modify-flags and receiver lists.
> 
> The problem is how can I determine
> if a connection is a pointer or not ?
> Which I'm not sure might be the same as mutable ?
> ( The type of connection need not be a standard Python type,
> but might be any type created by the user. )

AFAIK there is no distinction possible by some attribute or function. I 
guess your safest bet is to provide a discreet list of immutables, and 
check objects for them being subclass of these. If yes, create the 
needed communication channels.

OTOH, the better option might even be to intercept the setting of 
objects on your bricks. If somebody sets a value on some brick's "slot", 
this is *always* something that needs to be communicated - it could be a 
new list, couldn't it? So knowing if that object is mutable is 
irrelevant I'd say.

Diez


From claird at lairds.us  Tue Feb 17 09:30:27 2009
From: claird at lairds.us (Cameron Laird)
Date: Tue, 17 Feb 2009 14:30:27 +0000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
Message-ID: <39uq66-b7j.ln1@lairds.us>

In article <pan.2009.02.10.22.26.39 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
			.
			.
			.
>> And now for my version (which admitedly isn't really mine, and returns
>> slightly incorrect fib(n) for large values of n, due to the limited
>> floating point precision).
>
>The floating point version is nice, but it starts giving incorrect 
>answers relatively early, from n=71. But if you don't need accurate 
>results (a relative error of 3e-15 for n=71), it is very fast.
			.
			.
			.
While my personal opinion is that it's silly to 
characterize an error of 3e-15 as not "accurate",
I think more constructive is to focus on the fact
that the closed-form solution can be touched up
to give a precise integral solution, while re-
taining its (approximately) O(log n) run-time
cost.


From floris.bruynooghe at gmail.com  Tue Feb 17 09:30:45 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 06:30:45 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com> 
	<mailman.86.1234848688.11746.python-list@python.org>
Message-ID: <ae9cac11-aa27-4213-b1aa-a3cc2f9bbb6f@f33g2000vbf.googlegroups.com>

On Feb 17, 5:31?am, Chris Rebert <c... at rebertia.com> wrote:
> My understanding is that for efficiency purposes Python hangs on to
> the extra memory even after the object has been GC-ed and doesn't give
> it back to the OS right away.

Even if Python would free() the space no more used by it's own memory
allocator (PyMem_Malloc(), PyMem_Free() & Co) the OS usually doesn't
return this space to the global free memory pool but instead leaves it
assigned to the process, again for performance reasons.  Only when the
OS is running out of memory it will go and get the free()ed memory of
processes back.  There might be a way to force your OS to do so
earlier manually if you really want but I'm not sure how you'd do
that.

Regards
Floris


From david.russell at fdmgroup.com  Tue Feb 17 09:35:05 2009
From: david.russell at fdmgroup.com (David Russell)
Date: Tue, 17 Feb 2009 14:35:05 -0000
Subject: 2 very interesting python projects - Financial industry
Message-ID: <E5420629A0DEB64291F2973D3D3D5FFC9DC847@fdm-mail02.fdmgroup.local>

Dear Python experts,

 

First of all sorry for the unsolicited email,

 

I have attached two very interesting long term Python projects in the
Frankfurt area, Financial industry.

 

I am working exclusively with the client on both requirements,
interviews and contracts can be arranged very quickly.

 

You will be involved in a project to develop the next generation of
financial trading systems, this will be the biggest, fastest trading
system of its kind in the world and will be used on a global scale.

 

Financial experience is not a must, they are looking more for technical
skills here.

 

If the projects look interesting to you please feel free to contact me
on the contact details below.

 

Thank you for your help,

 

Best Regards

 

David

 

Large Financial Institution - Frankfurt

 

Senior Python C/C++ Developer  (f/m)

 

Tasks/Responsibilities

Software developer for a complex electronic trading system.

The software developer will work in the implementation team of the
trading

system; tasks include:

        - Requirements Analysis

        - Development of a Scripting framework based on Python

        - Specification

        - Implementation

Target platform will be Linux.

 

Qualifications/Required Skills (Mandatory)

Rock Solid Python and C/C++ knowledge

Integration of Python with C/C++ libraries

Automated Testing

Good overview and knowledge of open source software

Experience of software development in large projects

Good communications skills

Ability to work in project teams

A good command of English is a must.

 

Additional Domain & Business Skills

Knowledge of derivatives trading an advantage, in particular U.S.
options.

 

Additional Information:

Frankfurt am Main, Germany

Start ASAP for a minimum of 6 months

Rate - Negotiable

 

This is an urgent requirement please contact me or send me your cv as
soon as possible.

 

Contact: David Russell - Account manager

email: david.russell at fdmgroup.com

Tel: +49 (0) 69 756 0050

Web: www.fdmgroup.com

 

 

////////////////////////////////////////////////////////////////////////
///

 

Large Financial Institution - Frankfurt am Main

 

Performance / High Availability Test Automation Engineer (f/m)

 

Tasks/Responsibilities

Developer of automated test procedures for a high-performance electronic
trading system.

The engineer will work in the Performance and Technical Test team of the
project; tasks include:

        - Requirements Analysis

        - Development of distributed transaction feed procedures, mostly
in Python

        - Implementation of automated result analysis

        - Design and implementation of test procedures for
failover/recovery scenarios in a multi-tier environment

        - Supervision of regular runs of the automated performance test
suite.

Target platform will be Linux.

 

Qualifications/Required Skills

Python scripting

Deep (>3 years) knowledge of Linux, with a focus in the areas

  - Performance monitoring and tuning

  - Messaging architectures

Performance testing experience, for latency and throughput, incl. data
aggregation and reporting Good communications skills Experience of
software development in large projects Good overview and knowledge of
open source software Ability to work in an international project team.

 

A good command of English is a must.

 

Additional Domain & Business Skills

Knowledge of statistical data analysis methods would be an advantage.

Experience in mechanisms of interfacing C/C++ and Python would also be
advantageous.

Frankfurt am Main, Germany

Start ASAP to 31.12.09 with good extension prospects for 2010

Rate - Negotiable

 

This is an urgent requirement please contact me or send me your cv as
soon as possible.

 

Contact: David Russell - Account manager

email: david.russell at fdmgroup.com

Tel: +49 (0) 69 756 0050

Web: www.fdmgroup.com

 

 

David Russell

Account Manager

 

FDM Group

 


 

 

Beethoven Strasse 4,

60325 Frankfurt am Main

Germany

david.russell at fdmgroup.com <mailto:kasia at fdmgroup.com> 

 

Tel:  + 49 (0) 69 756 0050

Cell: + 49 (0) 173 3592288

Fax: + 49 (0) 69 756 00555

 

www.fdmgroup.com <http://www.fdmgroup.com/>   www.fdmacademy.com
<http://www.fdmacademy.com/>  

BRIGHTON, LONDON, MANCHESTER, LUXEMBOURG, FRANKFURT, ZURICH & NEW YORK

 


This message is from FDM Group Plc, and may contain information that is confidential or privileged.  If you are not the intended recipient, please delete the message and any attachments and notify the sender.  This email is not intended to create legally binding commitments on behalf of FDM Group Plc, nor do its contents reflect the corporate views or policies of FDM.  Any unauthorised disclosure, use or dissemination, either whole or partial, is prohibited. FDM Group Plc is a private limited company registered in England (Reg. No. 2542980).


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From marduk at letterboxes.org  Tue Feb 17 09:38:41 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 17 Feb 2009 09:38:41 -0500
Subject: listing files by modification time
In-Reply-To: <48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>
References: <48224a820902170431g3711d4b6o8157580bb2f3b257@mail.gmail.com>
	<48224a820902170616p531c38c2pb4cb8a9245799b9d@mail.gmail.com>
Message-ID: <1234881521.5905.3.camel@centar.nbk>

On Tue, 2009-02-17 at 19:46 +0530, Deepak Rokade wrote:
> 
> Yes I can do that but for that I will have to go through entire list
> of files and also I will have to first get the whole list of files
> present in directory.
> 
> In case of my application this list can be huge and so want to list
> the files which suits my criteria.
> Similar to the unix find command I sent earlier or like below.
> 

In that case use a generator like os.walk.  That's pretty much the same
thing "find" does anyway.




From stef.mientki at gmail.com  Tue Feb 17 09:49:00 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 17 Feb 2009 15:49:00 +0100
Subject: how to detect if an object is "simple" (not a pointer, unmutable
	)  ?
In-Reply-To: <6vvv7tFlvv6jU1@mid.uni-berlin.de>
References: <mailman.109.1234879101.11746.python-list@python.org>
	<6vvv7tFlvv6jU1@mid.uni-berlin.de>
Message-ID: <499ACE5C.6040400@gmail.com>

thanks Diez,

Diez B. Roggisch wrote:
> Stef Mientki schrieb:
>> hello,
>>
>> I'm making a virtual machine,
>> in which (small) pieces of software (called bricks) are connected,
>> by connecting an output of a brick to the input of another brick.
>>
>> A connection between 2 bricks may be of any type,
>> so it might be simple integer,
>> or a multi-nested dictionary / list or whatsoever .
>>
>> Connections are made with the following statement (in simplified form)
>>
>> Brick2.In = Brick2.Out
>>
>> Now if the connection is a complex object, e.g. a list,
>> Brick2.In and Brick2.Out points to the same object,
>> and can automatically exchange information.
>>
>> Now if the connection consists of a simple integer,
>> the statement Brick2.In = Brick2.Out
>> just assigns once a value to Brick2,
>> so there's no real communication anymore.
>> I solved that by adding modify-flags and receiver lists.
>>
>> The problem is how can I determine
>> if a connection is a pointer or not ?
>> Which I'm not sure might be the same as mutable ?
>> ( The type of connection need not be a standard Python type,
>> but might be any type created by the user. )
>
> AFAIK there is no distinction possible by some attribute or function. 
> I guess your safest bet is to provide a discreet list of immutables, 
> and check objects for them being subclass of these.
Yes that's a reasonable approach.
Still I find it strange that you can't detect if an object is immutable.
> If yes, create the needed communication channels.
>
> OTOH, the better option might even be to intercept the setting of 
> objects on your bricks. If somebody sets a value on some brick's 
> "slot", this is *always* something that needs to be communicated 
if there are receivers / listeners, Yes
> - it could be a new list, couldn't it?
I've thought about that, but it makes the creation of the Bricks (which 
should be possible by novices) more complex.
By not making it a list on default, the execution of a brick might be as 
simple as:
  Out = 3 * In
But of course I could wrap that up, so it'll become a list,
I'll think about that.

thanks,
Stef
> So knowing if that object is mutable is irrelevant I'd say.
>
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From linuxguy123 at gmail.com  Tue Feb 17 09:54:40 2009
From: linuxguy123 at gmail.com (Linuxguy123)
Date: Tue, 17 Feb 2009 07:54:40 -0700
Subject: How do I declare global vars or class vars in Python ?
Message-ID: <1234882480.4183.5.camel@localhost.localdomain>

How do I do this in Python ?

#############################
declare A,B

function getA
    return A

function getB
    return B

function setA(value)
     A = value

function setB(value)
     B = value

main()
    getA
    getB
    dosomething
    setA(aValue)
    setB(aValue)
############################

The part I don't know to do is declare the variables, either as globals
or as vars in a class.  How is this done in Python without setting them
to a value ?

Thanks	
    




From roy at panix.com  Tue Feb 17 09:55:15 2009
From: roy at panix.com (Roy Smith)
Date: Tue, 17 Feb 2009 09:55:15 -0500
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
	<01aaa1da$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <roy-9C6103.09551517022009@news.panix.com>

In article <01aaa1da$0$20629$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at pearwood.info> wrote:

> Okay, but that surely falls under chapter 18 of the "Advanced Python
> Programming for the Mars Rover" book rather than chapter 5 of "Newbies
> Guide to Python".

Well, sure, but this thread started out with my taking, ahem, exception to 
the statement, "never use bare excepts at all".  I agree that doing so is 
not typical, and not the kind of habit that new programmers should form 
because it's not the kind of situation new programmers are likely to be 
involved in.  But, "never" was too strong a word.


From kyosohma at gmail.com  Tue Feb 17 10:02:53 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 17 Feb 2009 07:02:53 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
	<70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
Message-ID: <aec079e2-058c-41e1-a338-07553f369f9e@j8g2000yql.googlegroups.com>

On Feb 17, 8:15?am, ??? <newpt... at gmail.com> wrote:
> Thanks for your reply.
>
> With sqlalchemy, an mapped must living in a session, you have no way
> to disconnect it with its session.
>
> For example :
>
> #-------------------------------------
> user = session.query(User).first()
> session.expunge(user)
> print user.name ? #Error here
> #-------------------------------------
>
> I just want to get an read-only copy of user disconnected with session
> to avoid ?unexpected database operation.
> But after expunge, properties of user is not accessible anymore.


If you don't want any unexpected database operations, don't call flush
() or commit() or just call rollback() BEFORE you do any real
operations.

There is a good sqlalchemy mailing list where even the developers hang
out and answer questions. I'm sure they could point you in the right
direction too.

Mike






>
> BTW : why you choose elixir instead of sqlalchemy's own schema
> definition style?
> Doesn't including another library means more chances of bugs?
>
> On Feb 17, 9:24?pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>
> > ??? schrieb:
>
> > > Hi all,
>
> > > Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> > > These are very powerful technologies to handle database. ?But I think
> > > my project are not complicated to enough to benefit from a complete
> > > ORM system.
>
> > > What I really want, is some easy ways to load data from database, and
> > > change rows of data to list of named tuple, then I could send these
> > > data to my client application.
>
> > > I don't think I want these subtle behavior such as lazy load, auto
> > > update, ect. in ORM.
>
> > > So is there some libraries like that?
>
> > > Or is there some tools that could generate code from database scheme
> > > as I want?
>
> > Sqlalchemy. You don't need to use the ORM-layer, and you can use
> > reflection to create schema-objects like tables.
>
> > Then you can use that to create SQL-queries simple & powerful, whilst
> > being DB-agnostic and having a road to start using the ORM if you
> > discover it is useful for you.
>
> > To be honest: if you can control the schema, I'd still go for an orm. I
> > for example use elixir. It makes the easy things *really* easy, and the
> > complicated ones ar still possible.
>
> > Diez



From google at mrabarnett.plus.com  Tue Feb 17 10:07:37 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 17 Feb 2009 15:07:37 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <1234882480.4183.5.camel@localhost.localdomain>
References: <1234882480.4183.5.camel@localhost.localdomain>
Message-ID: <499AD2B9.5020001@mrabarnett.plus.com>

Linuxguy123 wrote:
> How do I do this in Python ?
> 
> #############################
> declare A,B
> 
> function getA
>     return A
> 
> function getB
>     return B
> 
> function setA(value)
>      A = value
> 
> function setB(value)
>      B = value
> 
> main()
>     getA
>     getB
>     dosomething
>     setA(aValue)
>     setB(aValue)
> ############################
> 
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class.  How is this done in Python without setting them
> to a value ?
> 
It isn't possible to have an uninitialised variable. If it doesn't have
a value then it doesn't exist.


From patrick.oloughlin at gmail.com  Tue Feb 17 10:10:51 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:10:51 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <1234882480.4183.5.camel@localhost.localdomain>
References: <1234882480.4183.5.camel@localhost.localdomain>
Message-ID: <cc34a9320902170710r3496758y458dfaf7615866e7@mail.gmail.com>

Use the global statement.
http://docs.python.org/reference/simple_stmts.html#the-global-statement

A working example based on your pseudocode would be:
####################################
def getA():
    global A
    return A

def getB():
    global B
    return B

def setA(value):
    global A
    A = value

def setB(value):
    global B
    B = value

def main():
    setA(5)
    setB(6)
    print getA()
    print getB()

if __name__ == '__main__':
    main()

#####################################

Although honestly, I think you'd be best not coding like that (with
gets and sets and all) in python.

Paddy

2009/2/17 Linuxguy123 <linuxguy123 at gmail.com>:
> How do I do this in Python ?
>
> #############################
> declare A,B
>
> function getA
>    return A
>
> function getB
>    return B
>
> function setA(value)
>     A = value
>
> function setB(value)
>     B = value
>
> main()
>    getA
>    getB
>    dosomething
>    setA(aValue)
>    setB(aValue)
> ############################
>
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class.  How is this done in Python without setting them
> to a value ?
>
> Thanks
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From floris.bruynooghe at gmail.com  Tue Feb 17 10:12:02 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 07:12:02 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org> 
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org> 
	<gnaak5$1nek$1@services.telesweet.net>
Message-ID: <ed09f4b9-4469-4e2f-a8a8-a923b8ca093d@r24g2000vbp.googlegroups.com>

On Feb 16, 12:05?am, Mel <mwil... at the-wire.com> wrote:
> Christian Heimes wrote:
> > Roy Smith wrote:
> >> They make sense when you need to recover from any error that may occur,
> >> possibly as the last resort after catching and dealing with more specific
> >> exceptions. In an unattended embedded system (think Mars Rover), the
> >> top-level code might well be:
>
> >> while 1:
> >> ? ?try:
> >> ? ? ? main()
> >> ? ?except:
> >> ? ? ? reset()
>
> > Do you really want to except SystemExit, KeyboardInterrupt, MemoryError
> > and SyntaxError?
>
> Exactly. ?A normal program should never do anything more comprehensive than
>
> try:
> ? ? some_function ()
> except StandardError:
> ? ? some_handling ()

Hmm, most places advocate or even outright recommend derriving your
own exceptions from Exception and not from StandardError.  So maybe
your catch-all should be Exception?  In that case you would be
catching warnings though, no idea what influence that has on the
warning system.

Regards
Floris

PS: Does anybody know why StopIterantion derrives from Exception while
GeneratorExit derrives from BaseException?  This could be as annoying/
confusing as Warning.


From patrick.oloughlin at gmail.com  Tue Feb 17 10:13:38 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:13:38 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499AD2B9.5020001@mrabarnett.plus.com>
References: <1234882480.4183.5.camel@localhost.localdomain>
	<499AD2B9.5020001@mrabarnett.plus.com>
Message-ID: <cc34a9320902170713n49130127s8021428bb223c73f@mail.gmail.com>

2009/2/17 MRAB <google at mrabarnett.plus.com>:
> It isn't possible to have an uninitialised variable. If it doesn't have
> a value then it doesn't exist.

True, but you can use the global statement to refer to the variable
within a function and read from the variable there, without it being
already initialised in the module.

Of course, if you try to call that function before the global has been
initialised, python will complain [and rightly so :)]

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From jjposner at snet.net  Tue Feb 17 10:14:06 2009
From: jjposner at snet.net (John Posner)
Date: Tue, 17 Feb 2009 10:14:06 -0500
Subject: Changing the Image on a button
In-Reply-To: <e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
	<e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
Message-ID: <DAF110A3BA874133B780F430BDF61BCC@AMDUP>

 >> > Try this change:
 >> >
 >> > ? from: btn.configure(image = None)
 >> > ? ? to: img1.blank()
 >> >
 >> 
 >> This does in fact clear the image out, however it isn't causing the
 >> text to display... Do i have have to create a new button and swap it
 >> out?

I knew you were gonna ask that! :-) I haven't worked in this area before,
but I
found this at http://effbot.org/tkinterbook/button.htm:

    In earlier versions of Tkinter, the image option overrides the text
option.
    If you specify both, only the image is displayed. In later versions, you
can
    use the compound option to change this behavior. To display text on top
of
    an image, set compound to CENTER:
 
     b = Button(master, text="Click me", image=pattern, compound=CENTER)

So here's a reworking, in which the text and image are both toggled by
pressing the button:

### button that toggles both text and image
from Tkinter import *

def pushed():
    """callback: button push"""
    
    global toggle
    
    if toggle:
        btn.config(text="", image=img_empty)
        toggle = not toggle
    else:
        btn.config(text=msg, image=img_good)
        toggle = not toggle

### main program
toggle = True
msg = "hello"

root = Tk()

### store two versions of an image in global variables:
# 1. original image
img_good = PhotoImage(file="bacon.gif")

# 2. blank image, created by copying and erasing
img_empty = img_good.copy()
img_empty.blank()

### create toggle button
btn = Button(root, compound=CENTER,
            text="hello", font="helvetica 14 bold",
            image=img_good,
            command=pushed)
btn.pack()

### go
root.mainloop()





E-mail message checked by Spyware Doctor (6.0.0.386)
Database version: 5.11780
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From Ron.Barak at lsi.com  Tue Feb 17 10:18:03 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 17 Feb 2009 15:18:03 +0000
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <20090217070546.5442B4A12D2@riobu.com>
References: <20090217070546.5442B4A12D2@riobu.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>

Hi,

May I have your recommendations in choosing threads or processes for the following ?

I have a wxPython application that builds an internal database from a list of files and then displays various aspects of that data, 
in response to user's requests.

I want to add a module that finds events in a set of log files (LogManager).
These log files are potentially huge, and the initial processing is lengthy (several minutes).
Thus, when the user will choose LogManager, it would be unacceptable to block the other parts of the program, and so - the initial LogManager processing
would need to be done separately from the normal run of the program.
Once the initial processing is done, the main program would be notified and could display the results of LogManager processing.

I was thinking of either using threads, or using separate processes, for the main programs and LogManager.

What would you suggest I should consider in choosing between the two options ?
Are there other options besides threads and multi-processing ?

Thanks,
Ron.

From jcd at sdf.lonestar.org  Tue Feb 17 10:27:57 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Tue, 17 Feb 2009 10:27:57 -0500
Subject: Is there something easier than ORM?
In-Reply-To: <70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<6vvs4rFlvitlU1@mid.uni-berlin.de>
	<70dc50d8-6e24-465f-83e8-fbb00177cddf@n5g2000prc.googlegroups.com>
Message-ID: <1234884477.4608.1.camel@aalcdl07.lib.unc.edu>


On Tue, 2009-02-17 at 06:15 -0800, ??? wrote:
> Thanks for your reply.
> 
> With sqlalchemy, an mapped must living in a session, you have no way
> to disconnect it with its session.
> 
> For example :
> 
> #-------------------------------------
> user = session.query(User).first()
> session.expunge(user)
> print user.name   #Error here
> #-------------------------------------
> 
> I just want to get an read-only copy of user disconnected with session
> to avoid  unexpected database operation.
> But after expunge, properties of user is not accessible anymore.

For that, the Right Thing to Do(tm) is to log in to your session with
read-only permissions.





From floris.bruynooghe at gmail.com  Tue Feb 17 10:29:49 2009
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Tue, 17 Feb 2009 07:29:49 -0800 (PST)
Subject: Pythonic way to determine if a string is a number
References: <1234720016.23422.1300488109@webmail.messagingengine.com> 
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com> 
	<mailman.24.1234768147.11746.python-list@python.org>
Message-ID: <1de39f55-b42c-4d3e-8a9b-7d8f55f327d1@q18g2000vbn.googlegroups.com>

On Feb 16, 7:09?am, Python Nutter <pythonnut... at gmail.com> wrote:
> silly me, forgot to mention
>
> build a set from digits + '.' and use that for testing.

`.' is locale dependent.  Some locales might use `,' instead and maybe
there's even more out there that I don't know of.  So developing this
yourself from scratch seems dangerous, let it bubble down to libc
which should handle it correctly.


Regards
Floris


From patrick.oloughlin at gmail.com  Tue Feb 17 10:35:18 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 17 Feb 2009 15:35:18 +0000
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<af90b3410902152304vc5cc545t7bc1e2ca6470f063@mail.gmail.com>
	<af90b3410902152309m5b1ebd6fgabdccb5ad2283bf9@mail.gmail.com>
Message-ID: <cc34a9320902170735r683bc80n54a58f09cd683d6b@mail.gmail.com>

2009/2/16 Python Nutter <pythonnutter at gmail.com>:
> silly me, forgot to mention
>
> build a set from digits + '.' and use that for testing.
>
> Cheers,
> PN
>
>
> 2009/2/16 Python Nutter <pythonnutter at gmail.com>:
>> Type casting seems to be the wrong way to go about this.
>>
>> teststring = '15719'
>> teststring.isdigit()
>> returns True
>>
>> That takes care of integers.
>>
>> from string import digits
>> digits
>> '0123456789'
>>
>> now you have all the digits and you can do set testing in your logic
>> to see if the teststring has anything in digits
>>
>> A dumb way to test is alphanumeric
>>
>> teststring2 = '105.22'
>> teststring2.isalnum()
>> returns True
>>
>> now you can go on from there and test to further to eliminate
>> 'abcd385laf8' which on alnum() also returns true.

Hmmm, this doesn't seem right to me.

Unless I'm missing something, won't your code think that "123.123.123"
is numeric? What about scientific or engineering notation with
exponents?

What's wrong with using python's own casting rules (given that you are
trying to emulate the way python behaves? Or, alternatively, using a
regular expression (as Nick Craig-Wood did).

Given these solutions, type-conversion and catching the ValueError
appears, to me, to be correct, the most concise, and the most readable
solution.

Of course, if you want to use your own set of rules for number
encoding, then building your own regular expression would seem to be
the right way to go.

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From bryanvick at gmail.com  Tue Feb 17 10:37:12 2009
From: bryanvick at gmail.com (Bryan)
Date: Tue, 17 Feb 2009 07:37:12 -0800 (PST)
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com> 
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com> 
	<mailman.95.1234859707.11746.python-list@python.org>
Message-ID: <08e76f94-7d31-4200-a774-c5c41d72f91f@r15g2000prd.googlegroups.com>

On Feb 17, 12:34?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanv... at gmail.com> escribi?:
>
>
>
> > On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> >> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>
> >> > I have a Python v2.5.2 server running and I found some undesirable
> >> > behavior in the xmlrpclib module that is included with that version of
> >> > Python. ?The xmlrpclib version that is included with Python 2.6
> >> > changes the behavior for the better. ?I nervous about upgrading my
> >> > Python install to 2.6 on this server because I remember reading in the
> >> > docs of a library I use that it targets the 2.5 branch. ?What is the
> >> > best way to only upgrade the xmlrpclib in my 2.5 install?
> >> What behavior, exactly, do you not like in xmlrpclib? Diffing the 2.5
> >> and 2.6, only significant differences I see are checks for True/False
> >> as builtins left over from pre-2.4 and some datetime handling.
> > The xmlrpclib in my 2.5.2 install does not allow the marshaling of my
> > custom objects. ?It checks the type of my object, and if it isn't in a
> > hard-coded list of types, then a "Cannot marshal object of <type>
> > type" exception message shows up. ?The version in my Windows 2.6
> > install has a fall back case where if the type is not in the hard-
> > coded list, it simply calls Object.__dict__ to get a graph of the
> > object's values that can be marshaled into xmlrpc.
>
> > I am using xmlrpc through Pylons. ?As a workaround, instead of
> > returning my custom objects in my xmlrpc server functions, I return
> > MyObject.__dict__
>
> > I also did not see anything in the revision log in the source file
> > about this change.
>
> It was rev.52790:http://svn.python.org/view?rev=52790&view=rev
> The tracker item has some background:http://bugs.python.org/issue1070046
>
> --
> Gabriel Genellina

Can you give me a quick run down of your process for researching this
information?  I don't spend much time looking at the svn or bug
tracker.  Should I be checking there before posting?

Bryan


From python at bdurham.com  Tue Feb 17 10:45:48 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 10:45:48 -0500
Subject: Pythonic way to determine if a string is a number
In-Reply-To: <roy-9C6103.09551517022009@news.panix.com>
References: <1234720016.23422.1300488109@webmail.messagingengine.com>
	<2B9BDEC0-5D49-4760-86D7-C36A5FC849C6@semanchuk.com>
	<mailman.9577.1234722607.3487.python-list@python.org>
	<roy-24DB5B.14011215022009@news.panix.com>
	<mailman.9582.1234728315.3487.python-list@python.org>
	<gnaak5$1nek$1@services.telesweet.net>
	<roy-7680F2.21352015022009@news.panix.com>
	<01aaa1da$0$20629$c3e8da3@news.astraweb.com>
	<roy-9C6103.09551517022009@news.panix.com>
Message-ID: <1234885548.2747.1300870339@webmail.messagingengine.com>

Original poster here: Just for the record, my *original* post did
include an explicit trapping of the ValueError exception. :) 

My point is that the coaching offered by this forum does not always fall
on deaf ears.

Thanks for everyone's help on this and all the other posts in this
forum.

Regards,
Malcolm

In article <01aaa1da$0$20629$c3e8da3 at news.astraweb.com>,
 Steven D'Aprano <steve at pearwood.info> wrote:

> Okay, but that surely falls under chapter 18 of the "Advanced Python
> Programming for the Mars Rover" book rather than chapter 5 of "Newbies
> Guide to Python".

Well, sure, but this thread started out with my taking, ahem, exception
to the statement, "never use bare excepts at all". I agree that doing so
is not typical, and not the kind of habit that new programmers should
form 
because it's not the kind of situation new programmers are likely to be 
involved in.  But, "never" was too strong a word.


From sturlamolden at yahoo.no  Tue Feb 17 10:50:33 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Tue, 17 Feb 2009 07:50:33 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>

On 16 Feb, 10:34, rushen... at gmail.com wrote:

> And the story begins here. As i search on the net,  I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs.

The GIL does not prevent multithreaded programs. If it did, why does
Python have a "threading" module?

The GIL prevents one use of threads: parallel processing in plain
Python. You can still do parallel processing using processes. Just
import "multiprocessing" instead of "threading". The two modules have
fairly similar APIs. You can still use threads to run tasks in the
background.

The GIL by the way, is an implementation detail. Nobody likes it very
much. But it is used for making it easier to extend Python with C
libraries (Python's raison d'etre). Not all C libraries are thread-
safe. The GIL is also used to synchronize access to reference counts.
In fact, Ruby is finally going to get a GIL as well. So it can't be
that bad.

As for parallel processing and multicore processors:

1. Even if a Python script can only exploit one core, we are always
running more than one process on the computer. For some reason this
obvious fact has to be repeated.

2. Parallel processing implies "need for speed". We have a 200x speed
penalty form Python alone. The "need for speed" are better served by
moving computational bottlenecks to C or Fortran. And in this case,
the GIL does not prevent us from doing parallel processing. The GIL
only affects the Python portion of the code.

3. Threads are not designed to be an abstraction for parallel
processing. For this they are awkward, tedious, and error prone.
Current threading APIs were designed for asynchronous tasks. Back in
the 1990s when multithreading became popular, SMPs were luxury only
few could afford, and multicore processors were unheard of.

4. The easy way to do parallel processing is not threads but OpenMP,
MPI, or HPF. Threads are used internally by OpenMP and HPF, but those
implementation details are taken care of by the compiler. Parallel
computers have been used by scientists and engineers for three decades
now, and threads have never been found a useful abstraction for manual
coding. Unfortunately, this knowledge has not been passed on from
physicists and engineers to the majority of computer programmers.
Today, there is a whole generation of misguided computer scientists
thinking that threads must be the way to use the new multicore
processors. Take a lesson from those actually experienced with
parallel computers and learn OpenMP!

5. If you still insist on parallel processing with Python threads --
ignoring what you can do with multiprocessing and native C/Fortran
extensions -- you can still do that as well. Just compile your script
with Cython or Pyrex and release the GIL manually. The drawback is
that you cannot touch any Python objects (only C objects) in your GIL-
free blocks. But after all, the GIL is used to synchronize reference
counting, so you would have to synchronize access to the Python
objects anyway.


import threading

def _threadproc():
     with nogil:
        # we do not hold the GIL here
        pass
     # now we have got the GIL back
     return

def foobar():
    t = threading.Thread(target=_threadproc)
    t.start()
    t.join()

That's it.





Sturla Molden



From sturlamolden at yahoo.no  Tue Feb 17 10:57:44 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Tue, 17 Feb 2009 07:57:44 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<mailman.37.1234782471.11746.python-list@python.org>
	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>
	<mailman.50.1234793130.11746.python-list@python.org>
	<6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
Message-ID: <0d62cc8c-6a53-46ef-b989-32b13422ab0a@x38g2000yqj.googlegroups.com>

On 16 Feb, 15:18, rushen... at gmail.com wrote:

> As you mentioned, using multi cores makes programs more fast and more
> popular. But what about stackless python? Does it interpret same set
> of python libraries with Cpython or Does it have a special sub set?

Stackless and CPython have a GIL, Jython and IronPython do not.

S.M.


From lists at cheimes.de  Tue Feb 17 10:59:33 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 16:59:33 +0100
Subject: memory recycling/garbage collecting problem
In-Reply-To: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
References: <57681bf10902162121y4aa9b40eue7d6560336468500@mail.gmail.com>
Message-ID: <gnemt5$cqi$1@ger.gmane.org>

Yuanxin Xi wrote:
> Could anyone please explain why this happens?  It seems some memory
> are not freed.  I'm running into problems with this as my program is
> very memory cosuming and need to frequently free some object to reuse
> the memory.  What is the best way to free the memory of b completely
> (i.e. back to the status as b was created)?  I'm using Python 2.5.2

Python uses malloc() and free() to allocate memory on the heap. Most
malloc() implementations don't give back memory to the system. Instead
the memory segment is still assigned to the process. In order to give
back memory to the system pool, a memory manager has to use mapped
memory (mmap()) instead of increasing the heap by changing the data
segment size with brk(). This isn't a Python flaw but a general issue
with malloc() based memory management. [1]

By the way Python has its own memory management system on top of the
system's malloc() system. The memory arena system is explained in great
detail in the file obmalloc.c [2].

Christian

[1] http://en.wikipedia.org/wiki/Malloc#Implementations
[2]
http://svn.python.org/view/python/branches/release25-maint/Objects/obmalloc.c?revision=65261&view=markup



From mabdelkader at gmail.com  Tue Feb 17 11:00:36 2009
From: mabdelkader at gmail.com (ma)
Date: Tue, 17 Feb 2009 11:00:36 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<c7499c08-e79f-468f-a2f6-034e9c033c99@m42g2000yqb.googlegroups.com>
Message-ID: <148918f0902170800p1c23d172rce5e6b9902ba07e9@mail.gmail.com>

Very well written response! Thanks Sturla


On Tue, Feb 17, 2009 at 10:50 AM, sturlamolden <sturlamolden at yahoo.no>wrote:

> On 16 Feb, 10:34, rushen... at gmail.com wrote:
>
> > And the story begins here. As i search on the net,  I have found that
> > because of the natural characteristics of python such as GIL, we are
> > not able to write multi threaded programs. Oooops, in a kind of time
> > with lots of cpu cores and we are not able to write multi threaded
> > programs.
>
> The GIL does not prevent multithreaded programs. If it did, why does
> Python have a "threading" module?
>
> The GIL prevents one use of threads: parallel processing in plain
> Python. You can still do parallel processing using processes. Just
> import "multiprocessing" instead of "threading". The two modules have
> fairly similar APIs. You can still use threads to run tasks in the
> background.
>
> The GIL by the way, is an implementation detail. Nobody likes it very
> much. But it is used for making it easier to extend Python with C
> libraries (Python's raison d'etre). Not all C libraries are thread-
> safe. The GIL is also used to synchronize access to reference counts.
> In fact, Ruby is finally going to get a GIL as well. So it can't be
> that bad.
>
> As for parallel processing and multicore processors:
>
> 1. Even if a Python script can only exploit one core, we are always
> running more than one process on the computer. For some reason this
> obvious fact has to be repeated.
>
> 2. Parallel processing implies "need for speed". We have a 200x speed
> penalty form Python alone. The "need for speed" are better served by
> moving computational bottlenecks to C or Fortran. And in this case,
> the GIL does not prevent us from doing parallel processing. The GIL
> only affects the Python portion of the code.
>
> 3. Threads are not designed to be an abstraction for parallel
> processing. For this they are awkward, tedious, and error prone.
> Current threading APIs were designed for asynchronous tasks. Back in
> the 1990s when multithreading became popular, SMPs were luxury only
> few could afford, and multicore processors were unheard of.
>
> 4. The easy way to do parallel processing is not threads but OpenMP,
> MPI, or HPF. Threads are used internally by OpenMP and HPF, but those
> implementation details are taken care of by the compiler. Parallel
> computers have been used by scientists and engineers for three decades
> now, and threads have never been found a useful abstraction for manual
> coding. Unfortunately, this knowledge has not been passed on from
> physicists and engineers to the majority of computer programmers.
> Today, there is a whole generation of misguided computer scientists
> thinking that threads must be the way to use the new multicore
> processors. Take a lesson from those actually experienced with
> parallel computers and learn OpenMP!
>
> 5. If you still insist on parallel processing with Python threads --
> ignoring what you can do with multiprocessing and native C/Fortran
> extensions -- you can still do that as well. Just compile your script
> with Cython or Pyrex and release the GIL manually. The drawback is
> that you cannot touch any Python objects (only C objects) in your GIL-
> free blocks. But after all, the GIL is used to synchronize reference
> counting, so you would have to synchronize access to the Python
> objects anyway.
>
>
> import threading
>
> def _threadproc():
>     with nogil:
>        # we do not hold the GIL here
>        pass
>     # now we have got the GIL back
>     return
>
> def foobar():
>    t = threading.Thread(target=_threadproc)
>    t.start()
>    t.join()
>
> That's it.
>
>
>
>
>
> Sturla Molden
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From lists at cheimes.de  Tue Feb 17 11:04:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 17:04:12 +0100
Subject: memory recycling/garbage collecting problem
In-Reply-To: <1234879826.7672.11.camel@tim-laptop>
References: <mailman.85.1234848079.11746.python-list@python.org>	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
	<1234879826.7672.11.camel@tim-laptop>
Message-ID: <gnen5t$fjm$1@ger.gmane.org>

Tim Wintle wrote:
> Basically malloc() and free() are computationally expensive, so Python
> tries to call them as little as possible - but it's quite clever at
> knowing what to do - e.g. if a list has already grown large then python
> assumes it might grow large again and keeps hold of a percentage of the
> memory.

You are almost right. Python's mutable container types like have a
non-linear growth rate.

>From the file listobject.c

/*
This over-allocates proportional to the list size, making room
for additional growth.  The over-allocation is mild, but is
enough to give linear-time amortized behavior over a long
sequence of appends() in the presence of a poorly-performing
system realloc().
The growth pattern is:  0, 4, 8, 16, 25, 35, 46, 58, 72, 88, ...
*/

new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);



From kurdayon at yahoo.com  Tue Feb 17 11:19:10 2009
From: kurdayon at yahoo.com (Kurda Yon)
Date: Tue, 17 Feb 2009 08:19:10 -0800 (PST)
Subject: Python change a value of a variable by itself.
Message-ID: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>

Hi,

I have the following simple code:
r = {}
r[1] = [0.000000]
r_new = {}
print r[1][0]
r_new[1] = r[1]
r_new[1][0] = r[1][0] + 0.02
print r[1][0]

It outputs:
0.0
0.02

it is something strange to me since in the first and second case I
output the same variable (r[1][0]) and it the two cases it has
different values (in spite on the fact, that between the 2 outputs I
did not assign a new value to the variable).

Can anybody pleas explain me this strange behavior?

Thank you in advance.


From duncan.booth at invalid.invalid  Tue Feb 17 11:27:11 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 17 Feb 2009 16:27:11 GMT
Subject: How do I declare global vars or class vars in Python ?
References: <1234882480.4183.5.camel@localhost.localdomain>
	<499AD2B9.5020001@mrabarnett.plus.com>
	<mailman.117.1234883623.11746.python-list@python.org>
Message-ID: <Xns9BB5A748F137Fduncanbooth@127.0.0.1>

"Paddy O'Loughlin" <patrick.oloughlin at gmail.com> wrote:

> True, but you can use the global statement to refer to the variable
> within a function and read from the variable there, without it being
> already initialised in the module.

You don't need the global statement unless you plan to *write* the variable 
from the function.

-- 
Duncan Booth http://kupuguy.blogspot.com


From apt.shansen at gmail.com  Tue Feb 17 11:28:14 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Tue, 17 Feb 2009 08:28:14 -0800
Subject: Python change a value of a variable by itself.
In-Reply-To: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
References: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
Message-ID: <7a9c25c20902170828y1573b381j171ccf8e676245b3@mail.gmail.com>

On Tue, Feb 17, 2009 at 8:19 AM, Kurda Yon <kurdayon at yahoo.com> wrote:
> r_new[1] = r[1]

This is the problem. "r" is a dictionary, a set of key/object pairs in
essence. You're making the object that "r[1]" is pointing to a list, a
mutable sequence of items.

The expression "r[1]" will then return that list object and assign it
to "r_new[1]" -- but now both these two dictionaries are pointing to
the *same* object. Its not a copy of the object, but the same object
itself which you're storing in two different dictionaries.

If you want to store a copy of that list in r_new[1], you can use the
copy module, or something like:

r_new[1] = r[1][:]

which uses list slices to return a copy of the specified list.

HTH,

--Stephen


From python.list at tim.thechases.com  Tue Feb 17 11:29:57 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 10:29:57 -0600
Subject: Python change a value of a variable by itself.
In-Reply-To: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
References: <46b1d39a-3ff4-44fb-a23c-f334ce516862@t11g2000yqg.googlegroups.com>
Message-ID: <499AE605.2020605@tim.thechases.com>


> I have the following simple code:
> r = {}
> r[1] = [0.000000]
> r_new = {}
> print r[1][0]
> r_new[1] = r[1]
> r_new[1][0] = r[1][0] + 0.02
> print r[1][0]
> 
> It outputs:
> 0.0
> 0.02
> 
> it is something strange to me since in the first and second case I
> output the same variable (r[1][0]) and it the two cases it has
> different values (in spite on the fact, that between the 2 outputs I
> did not assign a new value to the variable).
> 
> Can anybody pleas explain me this strange behavior?

You're referencing into a single mutable object (a list):

   a = [1,2,3]
   b = a
   b[1] = 4
   print a

both r[1] and r_new[1] refer to the same list object, so when the 
contents of that single list object is changed ("r_new[1][0] = 
...") accessing it by either name ("r[1][0]" or "r_new[1][0]") 
returns the same list.

To create a new list in r_new, use

   r_new[1] = r[1][:]  # copy the contents of the list

-tkc







From Caseyweb at gmail.com  Tue Feb 17 11:31:28 2009
From: Caseyweb at gmail.com (Casey)
Date: Tue, 17 Feb 2009 08:31:28 -0800 (PST)
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
Message-ID: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>

On Feb 17, 7:28?am, Christian Heimes <li... at cheimes.de> wrote:
> Peter Billam schrieb:
>
> > Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
> > io.TextIOWrapper object; but I want to output bytes
> > ? (e.g. muscript -midi t > t.mid )
> > and they're coming out stringified :-( ?How can I either change the
> > encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
> > mode, or dup(fd) it first, or whatever the right thing to do is ?
>
> The official API to write binary data to stdout is:
>
> >>> count = sys.stdout.buffer.write(b"abc\n")
>
> abc
>
> Christian

Is this really the 'official' way to do this?  This isn't meant to be
confrontational or trolling; I honestly don't know the answer and I
had similar questions when I first started with the 3.0 release
candidates and I have yet to find a good answer in the Python v3.0
documentation.  Why wouldn't you just use:

print(bytes.decode(b'abc\n'), end='')


From philip at semanchuk.com  Tue Feb 17 11:35:00 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 11:35:00 -0500
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>


On Feb 17, 2009, at 7:27 AM, ??? wrote:

> Hi all,
>
> Recently I am studying some python ORM libraries, such as sqlalchemy.
>
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
>
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
>
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
>
> So is there some libraries like that?
>
> Or is there some tools that could generate code from database scheme
> as I want?

As others have suggested, there are lower-level libraries for database  
access, like the sqlite library included with Python >= 2.5.

The API wrapper I'm most familiar with (psycopg2) has some nice  
features like returning Postgres text as Python strings and Postgres  
ints as Python ints and Postgres arrays as Python lists. It can also  
return rows as dictionaries keyed by column names. You get some nice  
things for free.

I read someone's advice that one doesn't need an ORM for simple  
projects but they become more useful as projects grow in complexity.  
I'm not so sure of that. I felt like the opposite could well be true  
-- the limitations inherent in a general purpose tool like an ORM are  
less likely to be a problem in a small, simple project than a larger  
one.

In short, I gather that others on this list are a lot more fond of  
SqlAlchemy and ORMs in general than I am. Granted, my experience is  
very limited. I tried to integrate SqlAlchemy in one project,  
struggled for a long time to express how I wanted my tables joined,  
and finally found that performance was bad compared to our homegrown  
SQL. My boss and I were both very comfortable with SQL and were happy  
to go back to writing our own SQL statements and coding a data access  
layer.

I don't intend this as a criticism of SqlAlchemy. On the contrary I am  
impressed by what it does. But I often see people promoting ORM as the  
solution to all database access problems, and I certainly don't feel  
like it is.

Good luck,
Philip






From python-url at phaseit.net  Tue Feb 17 11:36:23 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Tue, 17 Feb 2009 16:36:23 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb 17)
Message-ID: <gnep27$rmb$1@lairds.us>

QOTW:  "The hardest part of design ...is keeping features out." - Donald
Norman, design guru and former Apple exec
    https://www.technologyreview.com/business/18621/

    
    Two short recipes: 
      Determine whether a string is a number or not:
        http://groups.google.com/group/comp.lang.python/t/5a63299d426f99ef
      See if a word contains some given characters:    
        http://groups.google.com/group/comp.lang.python/t/fb8c04c741e69f8f
     
    How to "peek" inside a decorated function to access the original one:
        http://groups.google.com/group/comp.lang.python/t/0fb2ee45dbc101b1
     
    Optimizing recursive calls:
        http://groups.google.com/group/comp.lang.python/t/2d3664075ff1363b
    
    Python 3.0.1, the first bug fix release of Python 3.0, was released last
    Saturday:
        http://www.python.org/download/releases/3.0.1/
    
    An attempt to define a generic "compress/decompress" interface (supporting
    zlib, bz2, maybe others):
        http://groups.google.com/group/comp.lang.python/t/ac2a57d661a3566c
    
    Long running processes and WSGI:
        http://groups.google.com/group/comp.lang.python/t/3d8a27fd5bb42842
    
    Unicode and the Windows console:
        http://groups.google.com/group/comp.lang.python/t/94360d3a3abf3747
    
    bool(some_generator) can't be used to check for "emptyness":
        http://groups.google.com/group/comp.lang.python/t/28cb5ad6cf9378bf
    
    An iterator class is the answer when a generator is not enough: 
        http://groups.google.com/group/comp.lang.python/t/2bbd5daed05bb025
    
    Using multiple processes as an alternative to multiple threads:
        http://groups.google.com/group/comp.lang.python/t/d068528be84ff8b5
     
    Can a function like Fibonacci's benefit from multicore architectures?
        http://groups.google.com/group/comp.lang.python/t/f66417d64090ee67
    
    Horrible algorithms have horrible performance -- don't count on
    automatic "optimizations":
        http://groups.google.com/group/comp.lang.python/t/3360de7fda1b7818
     
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From michele.simionato at gmail.com  Tue Feb 17 11:46:02 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 08:46:02 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<mailman.128.1234888507.11746.python-list@python.org>
Message-ID: <c6cd9473-03ea-4995-bfc4-20773130e1fe@x38g2000yqj.googlegroups.com>

On Feb 17, 5:35?pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
>
> I don't intend this as a criticism of SqlAlchemy. On the contrary I am ?
> impressed by what it does. But I often see people promoting ORM as the ?
> solution to all database access problems, and I certainly don't feel ?
> like it is.

I am also not a big fan of ORM, especially in situations where you
have
performance issues and you are using database specific features. In
such situations
you don't care about portability, but you care about having your SQL
explicit,
so that you can run it directly under the profiler.


From mail at timgolden.me.uk  Tue Feb 17 11:50:52 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 17 Feb 2009 16:50:52 +0000
Subject: Is there something easier than ORM?
In-Reply-To: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
Message-ID: <499AEAEC.30902@timgolden.me.uk>

Philip Semanchuk wrote:
[... snip comments on SqlAlchemy which could likewise apply
to other similar offerings ...]


> I don't intend this as a criticism of SqlAlchemy. On the contrary I am 
> impressed by what it does. But I often see people promoting ORM as the 
> solution to all database access problems, and I certainly don't feel 
> like it is.


I'm with you: I'm very glad that so many people find SA (and Storm
and Mother & SQLObject etc. useful). Personally, I earn my living
designing, maintaining and coding for relational databases and I'm
simply more at home in native SQL. 

If you're on Windows, pyodbc offers you a general spread of databases 
and has quite a few conveniences such as named rows returned; it's
fairly robust and is actively maintained. I imagine that most people
who do this kind of thing long ago put together a simple wrapper
module (mine's imaginatively called "sql") which does just enough
to be useful but then gets out the way.

All that said, if you don't *want* to have to think about SQL
then something like SA + Elixir is about as useful a combination
as I've found.

TJG


From andrew at acooke.org  Tue Feb 17 11:52:56 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 17 Feb 2009 13:52:56 -0300 (CLST)
Subject: Is there something easier than ORM?
In-Reply-To: <8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
Message-ID: <49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>

Philip Semanchuk wrote:
> In short, I gather that others on this list are a lot more fond of
> SqlAlchemy and ORMs in general than I am. Granted, my experience is
> very limited. I tried to integrate SqlAlchemy in one project,
> struggled for a long time to express how I wanted my tables joined,
> and finally found that performance was bad compared to our homegrown
> SQL. My boss and I were both very comfortable with SQL and were happy
> to go back to writing our own SQL statements and coding a data access
> layer.
>
> I don't intend this as a criticism of SqlAlchemy. On the contrary I am
> impressed by what it does. But I often see people promoting ORM as the
> solution to all database access problems, and I certainly don't feel
> like it is.

the reason i, at least, like sqlalchemy so much is for exactly the reasons
you outlined.  unlike other orm solutions it doesn't force you to use orm.
 you can also use sql directly - either as simple strings or by
constructing it via python methods (which can be a very powerful way of
programatically constructing sql commands that would be a nightmare to
write by hand).  that gives you the flexibility to deal with each problem
in the way that feels most natural, without having to switch between tools
(in fact, i have mixed orm and "direct" sql in a single project with no
problems using sqlalchemy - reading from one database using sql and
writing to another using objects).

andrew




From gert.cuykens at gmail.com  Tue Feb 17 11:55:13 2009
From: gert.cuykens at gmail.com (gert)
Date: Tue, 17 Feb 2009 08:55:13 -0800 (PST)
Subject: Threading and tkinter
Message-ID: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>

After reading the docs and seeing a few examples i think this should
work ?
Am I forgetting something here or am I doing something stupid ?
Anyway I see my yellow screen, that has to count for something :)

from tkinter import *
from threading import Thread

class Weegbrug(Thread):
    def __init__(self,v):
        self.v=v
        Thread.__init__(self)
    def run(self):
        while True:
            with open('com1','r') as f:
                 for line in f:
                     self.v.set(line[2:-1])

root = Tk()
v = StringVar()
v.set("00000")
w = Weegbrug(v)
w.start()
tx = Label(root, textvariable=v, width=800, height=600, bg="yellow",
font=("Helvetica", 300))
tx.pack(expand=YES, fill=BOTH)
root.title("Weegbrug")
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.mainloop()


From lists at cheimes.de  Tue Feb 17 11:55:46 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 17:55:46 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<mailman.37.1234782471.11746.python-list@python.org>	<9c001ccd-24cb-4bbd-af31-94ad0f255982@z1g2000yqn.googlegroups.com>	<mailman.50.1234793130.11746.python-list@python.org>
	<6c29ea7b-d30e-4358-8a3f-54758b1f4cde@o11g2000yql.googlegroups.com>
Message-ID: <gneq6i$rns$1@ger.gmane.org>

rushenaly at gmail.com wrote:
> As you mentioned, using multi cores makes programs more fast and more
> popular. But what about stackless python? Does it interpret same set
> of python libraries with Cpython or Does it have a special sub set?

Your assumption is wrong. Multiple cores are able to speed up some kind
of programs. But they don't necessarily increase the speed of every
program.

Lot's of programs are IO bound (hard disk IO, network IO, memory IO).
Multiple CPU cores don't increase the speed of your hard disk! Lots of
algorithms are not designed for parallel computing. New algorithms must
be invented from the ground up.
In fact multiple CPUs can decrease the speed of a program because every
additional CPU increases the cost for house keeping and cache
invalidation. Please don't believe in marketing lies, neither 64bit nor
multiple CPUs magically increase the speed of your computer. It's going
to take at least half a decade until the tools for multi core
development are working properly and reliable.

Christian



From bearophileHUGS at lycos.com  Tue Feb 17 12:00:49 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 09:00:49 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>
Message-ID: <41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>

Jayson Santos:
> After changing my code to use only functions instead classes
> my code is too much faster.
> Here cProfile statistcs:
> Using old code : 633608 function calls in 1.361 CPU seconds
> Using new code: 475487 function calls in 0.800 CPU seconds

If you show a pastebin of the new version (you can also paste it, for
reference for future people, when the pastebin will be deleted),
probably there are ways to improve it more.
And I also suggest you to try Psyco. (Someone recently has shown here
a compiled version for Windows of Psyco for Python 2.6).

Bye,
bearophile


From vedrandekovic at gmail.com  Tue Feb 17 12:02:36 2009
From: vedrandekovic at gmail.com (vedrandekovic at gmail.com)
Date: Tue, 17 Feb 2009 09:02:36 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com> 
	<gncrom$iil$1@ss408.t-com.hr>
Message-ID: <2a3da6d9-3725-4152-aff8-4bbb33e31cc0@v38g2000yqb.googlegroups.com>

On 17 velj, 00:09, "alejandro" <aleksanda... at brisiovonet.hr> wrote:
> Provjeri da si nisi stavio ansii kada si instalirao wx.python.
> Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u
> UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem

Pozdrav / Hello,

It works now, all post were very useful, but now i have same problem
with python MySQLdb. I want data that I got from
wxPython TextCtrl write to MySQL database, but I don't know how to
configure it.

Any examples?

Regards,
John


From oamram at gmail.com  Tue Feb 17 12:03:06 2009
From: oamram at gmail.com (oamram)
Date: Tue, 17 Feb 2009 09:03:06 -0800 (PST)
Subject: Reading from text
Message-ID: <22061427.post@talk.nabble.com>


Hi All,
new to python. i have a directory with about 50 text file and i need to
iterate through them and get
line 7 to 11 from each file and write those lines into another file(one file
that will contain all lines).

Cheers, Omer.
-- 
View this message in context: http://www.nabble.com/Reading-from-text-tp22061427p22061427.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From philip at semanchuk.com  Tue Feb 17 12:08:29 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 12:08:29 -0500
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
References: <20090217070546.5442B4A12D2@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
Message-ID: <8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>


On Feb 17, 2009, at 10:18 AM, Barak, Ron wrote:

> I have a wxPython application that builds an internal database from  
> a list of files and then displays various aspects of that data,
> in response to user's requests.
>
> I want to add a module that finds events in a set of log files  
> (LogManager).
> These log files are potentially huge, and the initial processing is  
> lengthy (several minutes).
> Thus, when the user will choose LogManager, it would be unacceptable  
> to block the other parts of the program, and so - the initial  
> LogManager processing
> would need to be done separately from the normal run of the program.
> Once the initial processing is done, the main program would be  
> notified and could display the results of LogManager processing.
>
> I was thinking of either using threads, or using separate processes,  
> for the main programs and LogManager.
>
> What would you suggest I should consider in choosing between the two  
> options ?
> Are there other options besides threads and multi-processing ?

Hi Ron,
The general rule is that it is a lot easier to share data between  
threads than between processes. The multiprocessing library makes the  
latter easier but is only part of the standard library in Python >=  
2.6. The design of your application matters a lot. For instance, will  
the processing code write its results to a database, ping the GUI code  
and then exit, allowing the GUI to read the database? That sounds like  
an excellent setup for processes.

In addition, there's the GIL to consider. Multi-process applications  
aren't affected by it while multi-threaded applications may be. In  
these days where multi-processor/multi-core machines are more common,  
this fact is ever more important. Torrents of words have been written  
about the GIL on this list and elsewhere and I have nothing useful to  
add to the torrents. I encourage you to read some of those  
conversations.

FWIW, when I was faced with a similar setup, I went with multiple  
processes rather than threads.

Last but not least, since you asked about alternatives to threads and  
multiprocessing, I'll point you to some low level libraries I wrote  
for doing interprocess communication:
http://semanchuk.com/philip/posix_ipc/
http://semanchuk.com/philip/sysv_ipc/

Good luck
Philip






From robert.kern at gmail.com  Tue Feb 17 12:10:25 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 11:10:25 -0600
Subject: Is there something easier than ORM?
In-Reply-To: <49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost>
Message-ID: <gner21$ukv$1@ger.gmane.org>

On 2009-02-17 10:52, andrew cooke wrote:
> Philip Semanchuk wrote:
>> In short, I gather that others on this list are a lot more fond of
>> SqlAlchemy and ORMs in general than I am. Granted, my experience is
>> very limited. I tried to integrate SqlAlchemy in one project,
>> struggled for a long time to express how I wanted my tables joined,
>> and finally found that performance was bad compared to our homegrown
>> SQL. My boss and I were both very comfortable with SQL and were happy
>> to go back to writing our own SQL statements and coding a data access
>> layer.
>>
>> I don't intend this as a criticism of SqlAlchemy. On the contrary I am
>> impressed by what it does. But I often see people promoting ORM as the
>> solution to all database access problems, and I certainly don't feel
>> like it is.
>
> the reason i, at least, like sqlalchemy so much is for exactly the reasons
> you outlined.  unlike other orm solutions it doesn't force you to use orm.
>   you can also use sql directly - either as simple strings or by
> constructing it via python methods (which can be a very powerful way of
> programatically constructing sql commands that would be a nightmare to
> write by hand).  that gives you the flexibility to deal with each problem
> in the way that feels most natural, without having to switch between tools
> (in fact, i have mixed orm and "direct" sql in a single project with no
> problems using sqlalchemy - reading from one database using sql and
> writing to another using objects).

Me, too! I have often used SQLAlchemy as "a better DB-API" even if I don't touch 
its ORM. I really don't know what I would have done in my past projects without 
SQLAlchemy's table reflection and metadata introspection capabilities.

It does suffer some from TMTOWTDI, but there's usually a valid use case floating 
around somewhere for each WTDI.

Its public image definitely suffers from the impression that it's "an ORM" that 
can be compared on equal terms with packages that actually are just ORMs. I 
describe it as a very powerful toolkit for solving a wide variety of problems 
involving SQL databases. One of those tools happens to be an ORM.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From zorro at chez.Com  Tue Feb 17 12:12:07 2009
From: zorro at chez.Com (JB)
Date: Tue, 17 Feb 2009 18:12:07 +0100
Subject: Reading from text
In-Reply-To: <mailman.132.1234890195.11746.python-list@python.org>
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <499aefe5$0$3510$426a74cc@news.free.fr>

oamram a ?crit :
> Hi All,
> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one file
> that will contain all lines).

First create a function that read and parse one file

Then create a loop that call this function for each file in a directory

Modules to read :

http://www.python.org/doc/2.5.2/tut/node9.html#SECTION009210000000000000000
http://docs.python.org/library/os.html


Julien


From Krzysztof.Retel at googlemail.com  Tue Feb 17 12:16:08 2009
From: Krzysztof.Retel at googlemail.com (kretel)
Date: Tue, 17 Feb 2009 09:16:08 -0800 (PST)
Subject: A python versioning scheme for modules, patches, softwares etc.
Message-ID: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>

There exist a number of versioning schemes to keep track of software
version. Each developer certainly have it's own style and preferred
scheme. However, I am wonder if there is a specific versioning scheme
for python modules.

Regards,
Krzysztof


From peter at www.pjb.com.au  Tue Feb 17 12:23:26 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 17 Feb 2009 17:23:26 GMT
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
Message-ID: <slrngplskf.2vf.peter@box8.pjb.com.au>

On 2009-02-17, Christian Heimes <lists at cheimes.de> wrote:
> Peter Billam schrieb:
>> Greetings. (Newbie warning as usual) In Python3, sys.stdout is a
>> io.TextIOWrapper object; but I want to output bytes
>>   (e.g. muscript -midi t > t.mid )
>> and they're coming out stringified :-(  How can I either change the
>> encoding on sys.stdout, or close sys.stdout and reopen it in 'b'
>> mode, or dup(fd) it first, or whatever the right thing to do is ?
>
> The official API to write binary data to stdout is:
>
>>>> count = sys.stdout.buffer.write(b"abc\n")
> abc

That's the one that works the best for me :-)
Thanks for all the suggestions!

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From robert.kern at gmail.com  Tue Feb 17 12:31:00 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 11:31:00 -0600
Subject: A python versioning scheme for modules, patches, softwares etc.
In-Reply-To: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
References: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
Message-ID: <gnes8l$4kh$1@ger.gmane.org>

On 2009-02-17 11:16, kretel wrote:
> There exist a number of versioning schemes to keep track of software
> version. Each developer certainly have it's own style and preferred
> scheme. However, I am wonder if there is a specific versioning scheme
> for python modules.

A number of Python tools that manipulate Python packages use the version number 
parsing code in distutils.version, so it would be a good idea to use version 
numbers it can parse. From the docstring of the StrictVersion class in that module:

     """Version numbering for anal retentives and software idealists.
     Implements the standard interface for version number classes as
     described above.  A version number consists of two or three
     dot-separated numeric components, with an optional "pre-release" tag
     on the end.  The pre-release tag consists of the letter 'a' or 'b'
     followed by a number.  If the numeric components of two version
     numbers are equal, then one with a pre-release tag will always
     be deemed earlier (lesser) than one without.

     The following are valid version numbers (shown in the order that
     would be obtained by sorting according to the supplied cmp function):

         0.4       0.4.0  (these two are equivalent)
         0.4.1
         0.5a1
         0.5b3
         0.5
         0.9.6
         1.0
         1.0.4a3
         1.0.4b1
         1.0.4

     The following are examples of invalid version numbers:

         1
         2.7.2.2
         1.3.a4
         1.3pl1
         1.3c4

     The rationale for this version numbering system will be explained
     in the distutils documentation.
     """

You probably want to do release candidates, too, and the "1.3c4" format is 
really quite useful for that. In reality, people usually use LooseVersion from 
that module to parse version numbers, and it will accept "1.3c4". But it also 
accepts a whole lot of version number formats that I would not recommend that 
you use.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lists at cheimes.de  Tue Feb 17 12:33:41 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 18:33:41 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
Message-ID: <gnesdl$4q0$1@ger.gmane.org>

Casey wrote:
> Is this really the 'official' way to do this?  This isn't meant to be
> confrontational or trolling; I honestly don't know the answer and I
> had similar questions when I first started with the 3.0 release
> candidates and I have yet to find a good answer in the Python v3.0
> documentation.  

Yes, it's really the official way. You can google up the discussion
between me and Guido on the python-dev list if you don't trust me. ;)
The docs concur with me, too.

http://docs.python.org/3.0/library/sys.html#sys.stdin

Note: The standard streams are in text mode by default. To write or read
binary data to these, use the underlying binary buffer. For example, to
write bytes to stdout, use sys.stdout.buffer.write(b'abc').

> Why wouldn't you just use:
>
> print(bytes.decode(b'abc\n'), end='')

Because it doesn't work with binary data. You can't convert random bytes
to unicode. Try that with a JPEG file or even the byte sequence that
contains some invalid UTF-8 chars.

>>> bytes((255, 255, 255))
b'\xff\xff\xff'
>>> bytes((255, 255, 255)).decode()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 0:
unexpected code byte

Christian



From paul.lemelle at gmail.com  Tue Feb 17 12:37:27 2009
From: paul.lemelle at gmail.com (pdl5000)
Date: Tue, 17 Feb 2009 09:37:27 -0800 (PST)
Subject: Posting multiple files via a web site.
Message-ID: <dcc500ca-7111-48bb-a865-7dd6998fd5dc@f3g2000vbf.googlegroups.com>

I would like to start write a Python script that upload multiple files
to a web server.  I research the methods, and I am somewhat confused
between using the http & urllib2 modules.  I assume (and could be
wrong) that the most basic method would be to use a cgi-Python script
on the web server then use a client script on the local host - is this
a bad assumption?

And from the cgi script, would it be possible to direct the files to a
certain mount point?  If so, what method to use?

Thanks,
Paul


From bearophileHUGS at lycos.com  Tue Feb 17 12:48:21 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 09:48:21 -0800 (PST)
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>

oamram:
> i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another
> file(one file that will contain all lines).

Files can be iterated line-by-line, so this idiom:

for line in file: ...

will give you the lines, with newline. Once you have debugged that,
you can use the standard module glob (http://docs.python.org/library/
glob.html#module-glob ) to iterate on files.

If you have more problems, show use the code you have written and we
may suggest improvements.

Bye,
bearophile


From santosdosreis at gmail.com  Tue Feb 17 12:52:53 2009
From: santosdosreis at gmail.com (Jayson Santos)
Date: Tue, 17 Feb 2009 09:52:53 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com> 
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>
Message-ID: <5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>

On 17 fev, 14:00, bearophileH... at lycos.com wrote:
> Jayson Santos:
>
> > After changing my code to use only functions instead classes
> > my code is too much faster.
> > Here cProfile statistcs:
> > Using old code : 633608 function calls in 1.361 CPU seconds
> > Using new code: 475487 function calls in 0.800 CPU seconds
>
> If you show a pastebin of the new version (you can also paste it, for
> reference for future people, when the pastebin will be deleted),
> probably there are ways to improve it more.
> And I also suggest you to try Psyco. (Someone recently has shown here
> a compiled version for Windows of Psyco for Python 2.6).
>
> Bye,
> bearophile

I'm using linux with python 2.5
Here is the result using psyco.full(): 93 function calls in 0.243 CPU
seconds
And here is the final code: http://pastebin.com/f3e20d669
Bye,
Jayson


From lists at cheimes.de  Tue Feb 17 12:58:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 18:58:35 +0100
Subject: Threads vs. processes, what to consider in choosing ?
In-Reply-To: <8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>
References: <20090217070546.5442B4A12D2@riobu.com>	<7F0503CD69378F49BE0DC30661C6CCF60E687DA5@enbmail01.lsi.com>
	<8FEC3A08-25FA-421E-9FDA-F960A7AD99BC@semanchuk.com>
Message-ID: <gnetsb$a6k$1@ger.gmane.org>

Philip Semanchuk wrote:
> The general rule is that it is a lot easier to share data between
> threads than between processes. The multiprocessing library makes the
> latter easier but is only part of the standard library in Python >= 2.6.
> The design of your application matters a lot. For instance, will the
> processing code write its results to a database, ping the GUI code and
> then exit, allowing the GUI to read the database? That sounds like an
> excellent setup for processes.

A backport for Python 2.4 and 2.5 is available on pypi. Python 2.5.4 is
recommended though.

Christian



From google at mrabarnett.plus.com  Tue Feb 17 13:00:32 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 17 Feb 2009 18:00:32 +0000
Subject: Reading from text
In-Reply-To: <bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>
References: <mailman.132.1234890195.11746.python-list@python.org>
	<bcb75aba-2e10-4418-b72d-8f2a0aca39f9@v42g2000yqj.googlegroups.com>
Message-ID: <499AFB40.6030403@mrabarnett.plus.com>

bearophileHUGS at lycos.com wrote:
> oamram:
>> i have a directory with about 50 text file and i need to
>> iterate through them and get
>> line 7 to 11 from each file and write those lines into another
>> file(one file that will contain all lines).
> 
> Files can be iterated line-by-line, so this idiom:
> 
> for line in file: ...
> 
> will give you the lines, with newline. Once you have debugged that,
> you can use the standard module glob (http://docs.python.org/library/
> glob.html#module-glob ) to iterate on files.
> 
[snip]
Or:

     for index, line in enumerate(my_file): ...

where index will give you the line number (starting from 0, so you'll
want lines 6 to 10). You can break out of the loop when you have all the
lines you want.

> If you have more problems, show use the code you have written and we
> may suggest improvements.
> 


From invalid at invalid  Tue Feb 17 13:12:34 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 17 Feb 2009 12:12:34 -0600
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
Message-ID: <5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>

On 2009-02-17, oamram <oamram at gmail.com> wrote:

> i have a directory with about 50 text file and i need to
> iterate through them and get line 7 to 11 from each file and
> write those lines into another file(one file that will contain
> all lines).

Assuming this is a real task and not a homework problem, then
I'd do it this way:

  $ cd [directory containing 50 test files]
  $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt

-- 
Grant Edwards                   grante             Yow! ... My pants just went
                                  at               on a wild rampage through a
                               visi.com            Long Island Bowling Alley!!


From Caseyweb at gmail.com  Tue Feb 17 13:15:09 2009
From: Caseyweb at gmail.com (Casey)
Date: Tue, 17 Feb 2009 10:15:09 -0800 (PST)
Subject: printing bytes to stdout in Py3
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org> 
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com> 
	<mailman.136.1234892038.11746.python-list@python.org>
Message-ID: <61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>

On Feb 17, 12:33?pm, Christian Heimes <li... at cheimes.de> wrote:
> Yes, it's really the official way. You can google up the discussion
> between me and Guido on the python-dev list if you don't trust me. ;)
> The docs concur with me, too.
>
> http://docs.python.org/3.0/library/sys.html#sys.stdin
>
> Note: The standard streams are in text mode by default. To write or read
> binary data to these, use the underlying binary buffer. For example, to
> write bytes to stdout, use sys.stdout.buffer.write(b'abc').

Thanks! Incidentally, the 'Note:' section you reference in the HTML
docs doesn't appear to be in the .CHM file that installs with the
windows version of 3.01.  That would have made my search a lot
easier :-%


From lists at cheimes.de  Tue Feb 17 13:28:47 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 19:28:47 +0100
Subject: printing bytes to stdout in Py3
In-Reply-To: <61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
	<mailman.136.1234892038.11746.python-list@python.org>
	<61d3c9df-0123-42ef-a5db-16842fffc25c@l37g2000vba.googlegroups.com>
Message-ID: <gnevku$gtj$1@ger.gmane.org>

Casey schrieb:
> On Feb 17, 12:33 pm, Christian Heimes <li... at cheimes.de> wrote:
>> Yes, it's really the official way. You can google up the discussion
>> between me and Guido on the python-dev list if you don't trust me. ;)
>> The docs concur with me, too.
>>
>> http://docs.python.org/3.0/library/sys.html#sys.stdin
>>
>> Note: The standard streams are in text mode by default. To write or read
>> binary data to these, use the underlying binary buffer. For example, to
>> write bytes to stdout, use sys.stdout.buffer.write(b'abc').
> 
> Thanks! Incidentally, the 'Note:' section you reference in the HTML
> docs doesn't appear to be in the .CHM file that installs with the
> windows version of 3.01.  That would have made my search a lot
> easier :-%

Oh, that should not happen. Please report this bug!

Christian



From Scott.Daniels at Acm.Org  Tue Feb 17 13:31:07 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 17 Feb 2009 10:31:07 -0800
Subject: printing bytes to stdout in Py3
In-Reply-To: <ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
References: <slrngpkhao.3ri.peter@box8.pjb.com.au>
	<mailman.106.1234873692.11746.python-list@python.org>
	<ca8712ba-80b3-494a-acd3-1892816ea3b8@p29g2000vbn.googlegroups.com>
Message-ID: <QL6dnW_oaJt8nAbUnZ2dnUVZ_gydnZ2d@pdx.net>

Casey wrote:
> ... Is this the 'official' way to do this?...  Why wouldn't you just use:
> print(bytes.decode(b'abc\n'), end='')

Because that code is incapable of sending bytes that cannot be
interpreted as encoded in the "default" encoding.  If you are
sending a picture, for example, all possible byte sequences might
show up.  If the default encoding is "utf-8", for example, there
are byte sequences which are illegal.  I suspect you are confused
by thinking each byte must map to a character; such an encoding
could never suffice for Chinese, for example.

--Scott David Daniels
Scott.Daniels at Acm.Org


From bearophileHUGS at lycos.com  Tue Feb 17 13:35:40 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Tue, 17 Feb 2009 10:35:40 -0800 (PST)
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com> 
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com> 
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com> 
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com> 
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com> 
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com> 
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com> 
	<5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>
Message-ID: <8344eb45-c8ed-4513-9eaf-4fb1a4eba87b@v42g2000yqj.googlegroups.com>

Jayson Santos:
> And here is the final code:http://pastebin.com/f3e20d669

Note that if you use Psyco this lookup trick isn't useful, but if the
Psyco isn't available it can improve performance a little:
append = BitmapList['lines'].append


I suggest to replace this code:

        red, green, blue = struct.unpack('BBB', s[i:i+3])
        append({
            'red': red,
            'green': green,
            'blue': blue,
        })

With something just like:

        rbg = struct.unpack('BBB', s[i:i+3])

Later you can access r g and b by their position, avoiding the
allocation and creation of a new dict for each pixel.
(array.array too is able to do that, but using unpack is probably fine
too. Using an array.array you can probably decode many rbg triples in
a single time, and slice it later, this looks faster).


In the following code:

if __name__ == '__main__':
    ...
        ...
        for line in BitmapList['lines']:
            for x, color in enumerate(line):
                ...

note that Psyco is able to compile code only if it's inside functions
or methods, so it may give a bit of improvement if you move such loops
into a function.
I don't know if Psyco is already able to compile enumerate(), if not,
then replacing the enumerate with a manual counter speeds up the code.

I think ShedSkin doesn't have the struct module yet, once someone has
written such standard module, you can probably produce a compiled (C+
+) module with your code that 10-50 times faster than the original
Python code, with no changes in the Python code itself :-)

Bye,
bearophile


From python.list at tim.thechases.com  Tue Feb 17 13:44:07 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 12:44:07 -0600
Subject: Reading from text
In-Reply-To: <5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
References: <mailman.132.1234890195.11746.python-list@python.org>
	<5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
Message-ID: <499B0577.10807@tim.thechases.com>

> Assuming this is a real task and not a homework problem, then
> I'd do it this way:
> 
>   $ cd [directory containing 50 test files]
>   $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt

I'd use sed:

   sed -ns 7,11p /source/path/*.txt >/path/to/results.txt

hard to get much more concise than that with any common tool :)

-tkc






From sam at 2000soft.com  Tue Feb 17 13:49:08 2009
From: sam at 2000soft.com (Sam Clark)
Date: Tue, 17 Feb 2009 10:49:08 -0800
Subject: This application has failed to start because the application
	configuration is incorrect
Message-ID: <822B0E83D23291469317E34324687437022249@production.2000soft.com>

I am receiving the message "This application has failed to start because the application configuration is incorrect" when I attempt to run a compiled Python program on another machine.  I have used py2exe on both a 2.6.1 and a 2.6.0 version of the .py and .pyw files.  Everything works great on the machine where Python 2.6 is loaded, but fails on machines where I copy the .exe to the machine.  I'm a beginner at python programming.  In fact this is my first packaged program.  Any thoughts at a beginners level would be helpful.
 
Thank you,
 
Sam Clark
sam at 2000soft.com
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From noama at answers.com  Tue Feb 17 13:53:40 2009
From: noama at answers.com (Noam Aigerman)
Date: Tue, 17 Feb 2009 20:53:40 +0200
Subject: Kill a function while it's being executed
In-Reply-To: <1233761152.373.14.camel@localhost.localdomain>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>
	<1233761152.373.14.camel@localhost.localdomain>
Message-ID: <749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>

Hi,
Sorry for resurrecting an old thread, but it just bothers me that this
is the best way that python has to deal with killing running
functions... it's quite an ugly hack, no?

Is it a feature that's needed bit missing from python, or is it left out
on purpose (same way like java has deprecated thread.stop and
thread.suspend because they were not safe)?

Thanks, Noam

 

-----Original Message-----
From: python-list-bounces+noama=answers.com at python.org
[mailto:python-list-bounces+noama=answers.com at python.org] On Behalf Of
Albert Hopkins
Sent: Wednesday, February 04, 2009 5:26 PM
To: python-list at python.org
Subject: Re: Kill a function while it's being executed

On Wed, 2009-02-04 at 13:40 +0200, Noam Aigerman wrote:
> Hi All,
> I have a script in which I receive a list of functions. I iterate over
> the list and run each function. This functions are created by some
other
> user who is using the lib I wrote. Now, there are some cases in which
> the function I receive will never finish (stuck in infinite loop).
> Suppose I use a thread which times the amount of time passed since the
> function has started, Is there some way I can kill the function after
a
> certain amount of time has passed (without asking the user who's
giving
> me the list of functions to make them all have some way of notifying
> them to finish)?
> Thanks, Noam

Noam, did you hijack a thread?

You could decorate the functions with a timeout function.  Here's one
that I either wrote or copied from a recipe (can't recall):

class FunctionTimeOut(Exception):
    pass

def function_timeout(seconds):
    """Function decorator to raise a timeout on a function call"""
    import signal

    def decorate(f):
        def timeout(signum, frame):
            raise FunctionTimeOut()

        def funct(*args, **kwargs):
            old = signal.signal(signal.SIGALRM, timeout)
            signal.alarm(seconds)

            try:
                result = f(*args, **kwargs)
            finally:
                signal.signal(signal.SIGALRM, old)
            signal.alarm(0)
            return result

        return funct

    return decorate


Then

func_dec = function_timeout(TIMEOUT_SECS)
for func in function_list:
    timeout_function = func_dec(func)
    try:
        timeout_function(...)
    except FunctionTimeout:
        ...


-a



--
http://mail.python.org/mailman/listinfo/python-list



From martin at v.loewis.de  Tue Feb 17 13:54:11 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 17 Feb 2009 19:54:11 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <499b07d3$0$677$9b622d9e@news.freenet.de>

> So is there some libraries like that?

I always use a DB-API implementation for the database I use,
i.e. psycopg/psycopg2.

Named tuples are really easy to provide:

class NamedTuple:
  def __init__(self, names, values):
    for name, value in izip(names, values):
        setattr(self, name, value)

person_rows = "first last age".split()
def get_person(conn, id):
    conn.execute("select first, last, age from person where id=%d"
                 % (id,))
    return NamedTuple(person_rows, conn.fetchone())

Regards,
Martin


From Krzysztof.Retel at googlemail.com  Tue Feb 17 14:00:15 2009
From: Krzysztof.Retel at googlemail.com (kretel)
Date: Tue, 17 Feb 2009 11:00:15 -0800 (PST)
Subject: A python versioning scheme for modules, patches, softwares etc.
References: <eeec1df3-09b7-456f-8581-0a37b21443c4@m40g2000yqh.googlegroups.com>
	<mailman.135.1234891877.11746.python-list@python.org>
Message-ID: <2ccc7988-53ca-4329-b4ab-a63e95defaba@j1g2000yqi.googlegroups.com>

On Feb 17, 5:31?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-17 11:16, kretel wrote:
>
> > There exist a number of versioning schemes to keep track of software
> > version. Each developer certainly have it's own style and preferred
> > scheme. However, I am wonder if there is a specific versioning scheme
> > for python modules.
>
> A number of Python tools that manipulate Python packages use the version number
> parsing code in distutils.version, so it would be a good idea to use version
> numbers it can parse. From the docstring of the StrictVersion class in that module:
>
> ? ? ?"""Version numbering for anal retentives and software idealists.
> ? ? ?Implements the standard interface for version number classes as
> ? ? ?described above. ?A version number consists of two or three
> ? ? ?dot-separated numeric components, with an optional "pre-release" tag
> ? ? ?on the end. ?The pre-release tag consists of the letter 'a' or 'b'
> ? ? ?followed by a number. ?If the numeric components of two version
> ? ? ?numbers are equal, then one with a pre-release tag will always
> ? ? ?be deemed earlier (lesser) than one without.
>
> ? ? ?The following are valid version numbers (shown in the order that
> ? ? ?would be obtained by sorting according to the supplied cmp function):
>
> ? ? ? ? ?0.4 ? ? ? 0.4.0 ?(these two are equivalent)
> ? ? ? ? ?0.4.1
> ? ? ? ? ?0.5a1
> ? ? ? ? ?0.5b3
> ? ? ? ? ?0.5
> ? ? ? ? ?0.9.6
> ? ? ? ? ?1.0
> ? ? ? ? ?1.0.4a3
> ? ? ? ? ?1.0.4b1
> ? ? ? ? ?1.0.4
>
> ? ? ?The following are examples of invalid version numbers:
>
> ? ? ? ? ?1
> ? ? ? ? ?2.7.2.2
> ? ? ? ? ?1.3.a4
> ? ? ? ? ?1.3pl1
> ? ? ? ? ?1.3c4
>
> ? ? ?The rationale for this version numbering system will be explained
> ? ? ?in the distutils documentation.
> ? ? ?"""
>
> You probably want to do release candidates, too, and the "1.3c4" format is
> really quite useful for that. In reality, people usually use LooseVersion from
> that module to parse version numbers, and it will accept "1.3c4". But it also
> accepts a whole lot of version number formats that I would not recommend that
> you use.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

Thanks for pointing this out.


Krzysztof


From Scott.Daniels at Acm.Org  Tue Feb 17 14:01:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Tue, 17 Feb 2009 11:01:00 -0800
Subject: print string as raw string
In-Reply-To: <01aaa153$0$20629$c3e8da3@news.astraweb.com>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
	<01aaa153$0$20629$c3e8da3@news.astraweb.com>
Message-ID: <afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>

Steven D'Aprano wrote:
> Diez B. Roggisch wrote:
> 
>> Mirko Dziadzka schrieb:
>>> I'm trying to find a way to output strings in the raw-string format, e.g.
>>> print_as_raw_string(r"\.") should output r"\." instead of "\\."  ...
> In any case, this is just a variation of what repr() does.
>>>> repr(r'\.')
> "'\\\\.'"
> 
> What the OP seems to want is something like:...  a barely tested version:
> 
> def raw_repr(s):
>     """Return the repr of string s as a raw-string."""
>     r = repr(s)
>     if '\\\\' in r:
>         r = "r" + r.replace('\\\\', '\\')
>     assert not r.endswith('\\')
>     return r
...
The big issue I see is that lots of values cannot be represented
as raw strings.  Your code checks for a final '\', but many "control"
characters and the quote marks are also at issue.

raw_repr('["\']a\x13\xfebc\\de') should contain several nasty cases.


--Scott David Daniels
Scott.Daniels at Acm.Org


From invalid at invalid  Tue Feb 17 14:03:00 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 17 Feb 2009 13:03:00 -0600
Subject: Reading from text
References: <mailman.132.1234890195.11746.python-list@python.org>
	<5OKdneXdBqSPYwfUnZ2dnUVZ_tPinZ2d@posted.visi>
	<mailman.140.1234896250.11746.python-list@python.org>
Message-ID: <muidnVM6MoB5lAbUnZ2dnUVZ_jadnZ2d@posted.visi>

On 2009-02-17, Tim Chase <python.list at tim.thechases.com> wrote:
>> Assuming this is a real task and not a homework problem, then
>> I'd do it this way:
>> 
>>   $ cd [directory containing 50 test files]
>>   $ (for file in *; do head -n11 $file | tail -n5; done) >/path/to/results-file.txt
>
> I'd use sed:
>
>    sed -ns 7,11p /source/path/*.txt >/path/to/results.txt

Well done.

-- 
Grant Edwards                   grante             Yow! does your DRESSING
                                  at               ROOM have enough ASPARAGUS?
                               visi.com            


From kyosohma at gmail.com  Tue Feb 17 14:10:01 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 17 Feb 2009 11:10:01 -0800 (PST)
Subject: wxPython and Croatian characters
References: <08c279c8-7934-4dff-b657-73dc12e3dfa3@o36g2000yqh.googlegroups.com>
	<14f11397-7db3-4cf2-9d19-5038ef86dc3b@o40g2000prn.googlegroups.com> 
	<gncrom$iil$1@ss408.t-com.hr>
	<2a3da6d9-3725-4152-aff8-4bbb33e31cc0@v38g2000yqb.googlegroups.com>
Message-ID: <025d02e6-2b71-42e3-9ba2-f09ef293ac5f@o36g2000yqh.googlegroups.com>

On Feb 17, 11:02?am, vedrandeko... at gmail.com wrote:
> On 17 velj, 00:09, "alejandro" <aleksanda... at brisiovonet.hr> wrote:
>
> > Provjeri da si nisi stavio ansii kada si instalirao wx.python.
> > Mozes probat ubacit iznad svega u fajlu komentar u kojem pise da je fajl u
> > UTF-8 i onda bi ti trebalo sljakat. Nadem sutra pa ti posaljem
>
> Pozdrav / Hello,
>
> It works now, all post were very useful, but now i have same problem
> with python MySQLdb. I want data that I got from
> wxPython TextCtrl write to MySQL database, but I don't know how to
> configure it.
>
> Any examples?
>
> Regards,
> John

You'll need to look at the python database connector's docs and/or
MySQL's docs to know how to do that. It would help to know what you
are using to connect to the database: pyodbc, adodb, sqlalchemy?

Most of those packages have their own mailing lists, but you're
welcome to post here too.

Mike


From robert.kern at gmail.com  Tue Feb 17 14:25:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 13:25:09 -0600
Subject: Kill a function while it's being executed
In-Reply-To: <749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>
References: <c2c2b8e8-c20f-4ae8-b4ab-09ad167cfcfd@i24g2000prf.googlegroups.com><3eb685e5-dc80-41d0-acc2-2cafe0cb65c5@e18g2000yqo.googlegroups.com><6827582d-26ce-4245-88dd-d24955dc9f3a@x16g2000prn.googlegroups.com><1e7b7458-26f1-4ae6-b4d0-02dfbfc2cef3@l42g2000yqe.googlegroups.com><49897C95.1000301@wildenhain.de><749CACF29BDFB64E9F80189ECD77868804C00682@jermail1.atomant.net>	<1233761152.373.14.camel@localhost.localdomain>
	<749CACF29BDFB64E9F80189ECD77868804E87A09@jermail1.atomant.net>
Message-ID: <gnf2ul$udg$1@ger.gmane.org>

On 2009-02-17 12:53, Noam Aigerman wrote:
> Hi,
> Sorry for resurrecting an old thread, but it just bothers me that this
> is the best way that python has to deal with killing running
> functions... it's quite an ugly hack, no?
>
> Is it a feature that's needed bit missing from python, or is it left out
> on purpose (same way like java has deprecated thread.stop and
> thread.suspend because they were not safe)?

Left out on purpose because it is not safe.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From Olivier.Darge at gmail.com  Tue Feb 17 14:29:19 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Tue, 17 Feb 2009 11:29:19 -0800 (PST)
Subject: flexible find and replace ?
References: <18d1b669-7a79-4295-a1e2-4693d361d0af@v13g2000yqm.googlegroups.com>
Message-ID: <1d0c328a-17ce-483d-8b79-e098770df0db@o11g2000yql.googlegroups.com>

Thanks to everybody.
I need to test your propositions now :)

Olivier


From john106henry at hotmail.com  Tue Feb 17 14:37:26 2009
From: john106henry at hotmail.com (John Henry)
Date: Tue, 17 Feb 2009 11:37:26 -0800 (PST)
Subject: Invoking CutePDF from within Python
References: <590ed3f4-089a-41d7-aaa2-6d96f5ea1fa9@j39g2000yqn.googlegroups.com>
	<gn3knj$34a$1@aioe.org>
Message-ID: <d0a56078-319f-4508-9a10-b8ec10d0a7b5@k36g2000pri.googlegroups.com>

On Feb 13, 3:15?am, cm <carlos.m... at atisa.es> wrote:
> Hi John,> All I need is to say "Print this to CUTEPDF and store as xyz.pdf".
>
> I can't answer you question but let me make a suggestion: Try
> PdfCreator. It lets you control all the process using an activex
> control. It has events to tell you when the jobs has finish, or report
> you of eventual errors.
>
> Download it from sf.net, and look into the samples.
>
> Best regards,
>
> Carlos.

Thank you for your (and others') response.  TJG's VB script
translation was correct but the script failed to invoke CutePDF.  So,
I downloaded PDFCreator as suggested.  I used the create test page
example and it worked right away.

Thanks for the help.


From python at bdurham.com  Tue Feb 17 15:00:19 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 15:00:19 -0500
Subject: List of locale values for locale.setlocale() under Windows
Message-ID: <1234900820.29552.1300909493@webmail.messagingengine.com>

I'm experimenting with the locale module and have been unable to
get the documentation examples to run on Windows XP. (The
examples run fine on Linux).
In particular, none of the locale.setlocale( category, locale )'s
sample locale parameter values are considered valid. Example:
>>> locale.setlocale( locale.LC_ALL, 'fr_FR' )
Traceback (most recent call last):
  File "<pyshell#160>", line 1, in <module>
    locale.setlocale( locale.LC_ALL, 'fr_FR' )
  File "c:\python26\lib\locale.py", line 494, in setlocale
    return _setlocale(category, locale)
Error: unsupported locale setting
The documentation states that these values "may vary across
platforms".
Here's what I get for my current locale:
>>> locale.getlocale()
('English_United States', '1252')
Any suggestions on where I can find the official list of locale
codes for Windows XP (or better yet, all versions of Windows XP
or later)?
Thank you,
Malcolm
-------------- next part --------------
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From jervisau at gmail.com  Tue Feb 17 15:08:04 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Wed, 18 Feb 2009 07:08:04 +1100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
Message-ID: <8e63a5ce0902171208p321e8e11wd152a3df6f3680fe@mail.gmail.com>

>
> This moves the for-loop out of slow Python into fast C and should be much,
> much faster for very large input.
>

_Should_ be faster.

Here is my test on an XP system Python 2.5.4. I had similar results on
python 2.7 trunk.

WORD = 'g' * 100
WORD2 = 'g' * 50 + 'U'

BIGWORD = 'g' * 10000 + 'U'

def any_test(word):
    return any(vowel in word for vowel in 'aeiouAEIOU')

def for_test(word):
    for vowel in 'aeiouAEIOU':
        if vowel in word:
            return True
    else:
        return False

**no vowels**
any: [0.36063678618957751, 0.36116506191682773, 0.36212355395824081]
for: [0.24044885376801672, 0.2417684017413404, 0.24084797257163482]

**vowel 'U' final char**
any: [0.38218764069443112, 0.38431925474244588, 0.38238668882188831]
for: [0.16398578356553717, 0.16433223810347286, 0.16593555537176385]

**BIG word vowel 'U' final char**
any: [8.0007259193539895, 7.9797344140269644, 7.8901742633514012]
for: [7.6664422372764101, 7.6784683633957584, 7.6683055766498001]

Cheers,


From josh.dukes at microvu.com  Tue Feb 17 15:19:15 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:19:15 -0800
Subject: Scanning a file character by character
In-Reply-To: <499203C6.9070501@tim.thechases.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>
	<499203C6.9070501@tim.thechases.com>
Message-ID: <20090217121915.2bfd2859@microvu.com>

In [401]: import shlex

In [402]: shlex.split("""Joe went to 'the store' where he bought a "box of chocolates" and stuff.""")
Out[402]: 
['Joe',
 'went',
 'to',
 'the store',
 'where',
 'he',
 'bought',
 'a',
 'box of chocolates',
 'and',
 'stuff.']

how's that work for ya? 

http://docs.python.org/library/shlex.html

On Tue, 10 Feb 2009 16:46:30 -0600
Tim Chase <python.list at tim.thechases.com> wrote:

> >> Or for a slightly less simple minded splitting you could try
> >> re.split:
> >>
> >>>>> re.split("(\w+)", "The quick brown fox jumps, and falls
> >>>>> over.")[1::2]
> >> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> > 
> > 
> > Perhaps I'm missing something, but the above regex does the exact
> > same thing as line.split() except it is significantly slower and
> > harder to read.
> > 
> > Neither deal with quoted text, apostrophes, hyphens, punctuation or
> > any other details of real-world text. That's what I mean by
> > "simple-minded".
> 
>    >>> s = "The quick brown fox jumps, and falls over."
>    >>> import re
>    >>> re.split(r"(\w+)", s)[1::2]
>    ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
>    >>> s.split()
>    ['The', 'quick', 'brown', 'fox', 'jumps,', 'and', 'falls', 
> 'over.']
> 
> Note the difference in "jumps" vs. "jumps,"  (extra comma in the 
> string.split() version) and likewise the period after "over". 
> Thus not quite "the exact same thing as line.split()".
> 
> I think an easier-to-read variant would be
> 
>    >>> re.findall(r"\w+", s)
>    ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls', 'over']
> 
> which just finds words.  One could also just limit it to letters with
> 
>    re.findall("[a-zA-Z]", s)
> 
> as "\w" is a little more encompassing (letters and underscores) 
> if that's a problem.
> 
> -tkc
> 
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


-- 

Josh Dukes
MicroVu IT Department


From python.list at tim.thechases.com  Tue Feb 17 15:26:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 17 Feb 2009 14:26:17 -0600
Subject: Scanning a file character by character
In-Reply-To: <20090217121915.2bfd2859@microvu.com>
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>	<mailman.9119.1234152816.3487.python-list@python.org>	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>	<Xns9BAE798A293F9duncanbooth@127.0.0.1>	<pan.2009.02.10.22.02.57@REMOVE.THIS.cybersource.com.au>	<499203C6.9070501@tim.thechases.com>
	<20090217121915.2bfd2859@microvu.com>
Message-ID: <499B1D69.3050409@tim.thechases.com>

Josh Dukes wrote:
> In [401]: import shlex
> 
> In [402]: shlex.split("""Joe went to 'the store' where he bought a "box of chocolates" and stuff.""")
> 
> how's that work for ya? 

It works great if that's the desired behavior.  However, the OP 
wrote about splitting the lines into separate words, not 
"treating quoted items as a single word".  (OP: "How would I do 
separate lines into words without scanning one character at a time?")

But for pulling out quoted strings as units, the shlex is a great 
module.

-tkc




From josh.dukes at microvu.com  Tue Feb 17 15:30:43 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:30:43 -0800
Subject: Putting asterisks around text
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>
References: <BAY121-W3311BEB70FD114344C0BA5B9BC0@phx.gbl>
	<20090209132046.091f5b8a.darcy@druid.net>
	<7F0503CD69378F49BE0DC30661C6CCF60E687981@enbmail01.lsi.com>
Message-ID: <20090217123043.6ad2fb20@microvu.com>

> while understand_problem is False:
>     study("textbook")
> 
> complete("homework")
> 
> if want_help is True:
>     study("http://www.catb.org/~esr/faqs/smart-questions.html")

just a note but "if" and "while" evaluate variables as True or False
without a verbose test. e.g.:

while not understand_problem:
    study("textbook")

complete("homework")

if want_help:
    study("http://www.catb.org/~esr/faqs/smart-questions.html")

Just fyi...

-- 

Josh Dukes
MicroVu IT Department


From philip at semanchuk.com  Tue Feb 17 15:30:52 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 17 Feb 2009 15:30:52 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
Message-ID: <3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>


On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:

> Hi.
>
> I'm a newbie to python and am running:
>
> OS X 10.5.6
> Python 2.5.4

Hi John,
Are you using the system Python or have you installed another version?

Cheers
Philip




>
>
> and have run easy_install for gdal like this:
>
> /Library/Python/2.5/site-packages>sudo easy_install GDAL
> Password:
> Searching for GDAL
> Best match: GDAL 1.6.0
> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> GDAL 1.6.0 is already the active version in easy-install.pth
>
> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> i386.egg
> Processing dependencies for GDAL
> Finished processing dependencies for GDAL
>
> However, when I run python and try to import gdal, this is what  
> happens:
>
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import gdal
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named gdal
> >>>
>
> Clearly, it's not being found but I don't understand how to debug  
> this any further.  I have the *.egg in the site-packages directory  
> but don't understand if there is something else I have to do to make  
> it usable.  Any help would be much appreciated.
> Cheers.
> --------------
> John Helly, University of California, San Diego
> San Diego Supercomputer Center,  Mail Code 0527
> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
> and Physical Oceanography, Mail Code 0224
> 9500 Gilman Dr., La Jolla CA 92093
> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
> URL (http://www.sdsc.edu/~hellyj)
>
> --
> http://mail.python.org/mailman/listinfo/python-list



From hyugaricdeau at gmail.com  Tue Feb 17 15:31:50 2009
From: hyugaricdeau at gmail.com (Hyuga)
Date: Tue, 17 Feb 2009 12:31:50 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
Message-ID: <36f3db07-aede-46ab-9c09-f5f44f882f7c@t3g2000yqa.googlegroups.com>

On Feb 16, 4:34?am, rushen... at gmail.com wrote:
> Hi everybody,
> I am an engineer. I am trying to improve my software development
> abilities. I have started programming with ruby. I like it very much
> but i want to add something more. According to my previous research i
> have designed a learning path for myself. It's like something below.
> ? ? ? 1. Ruby (Mastering as much as possible)
> ? ? ? 2. Python (Mastering as much as possible)
> ? ? ? 3. Basic C++ or Basic Java
> And the story begins here. As i search on the net, ?I have found that
> because of the natural characteristics of python such as GIL, we are
> not able to write multi threaded programs. Oooops, in a kind of time
> with lots of cpu cores and we are not able to write multi threaded
> programs. That is out of fashion. How a such powerful language doesn't
> support multi threading. That is a big minus for python. But there is
> something interesting, something like multi processing. But is it a
> real alternative for multi threading. As i searched it is not, it
> requires heavy hardware requirements (lots of memory, lots of cpu
> power). Also it is not easy to implement, too much extra code...
>
> After all of that, i start to think about omiting python from my
> carrier path and directly choosing c++ or java. But i know google or
> youtube uses python very much. How can they choose a language which
> will be killed by multi threading a time in near future. I like python
> and its syntax, its flexibility.
>
> What do you think about multi threading and its effect on python. Why
> does python have such a break and what is the fix. Is it worth to make
> investment of time and money to a language it can not take advantage
> of multi cores?

Though I'm sure this has already been shot to death, I would just add
that maybe the better question would be: "Will Python make
multithreading less popular?"  My answer would be something along the
lines of, that would be nice, but it just depends on how many people
adopt Python for their applications, realize they can't use threads to
take advantage of multiple CPUs, ask this same bloody question for the
thousandth time, and are told to use the multiprocessing module.


From matzke at berkeley.edu  Tue Feb 17 15:36:07 2009
From: matzke at berkeley.edu (Nick Matzke)
Date: Tue, 17 Feb 2009 12:36:07 -0800
Subject: pythonic array subsetting
In-Reply-To: <499A5A73.4030905@islandtraining.com>
References: <499A560C.4000209@berkeley.edu>
	<499A5A73.4030905@islandtraining.com>
Message-ID: <499B1FB7.4000701@berkeley.edu>

Looks like "compress" is the right numpy function, but it took forever 
for me to find it...

x = array([[1,2,3], [4,5,6], [7,8,9]], dtype=float)
compress([1,2], x, axis=1)

result:
array([[ 1.,  2.],
        [ 4.,  5.],
        [ 7.,  8.]])




Gary Herron wrote:
> Nick Matzke wrote:
>> Hi,
>>
>> So I've got a square floating point array that is about 1000 x 1000.  
>> I need to  subset this array as efficiently as possible based on an 
>> ordered sublist of the list of rownames/colnames (they are the same, 
>> this is a symmetric array).
>>
>> e.g., if sublist is of length 500, and matches the rownames list at 
>> every other entry, I need to pull out a 500x500 array holding every 
>> other row & column in the parent array.
>>
>> I have to do this hundreds of times, so speed would be useful.
>>
>> Cheers!
>> Nick
> 
> Check out numpy at http://numpy.scipy.org
> 
> It can do what you want very efficiently.
> 
> 
> Gary Herron
> 
>>
>>
>>
> 
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Lab websites:
http://ib.berkeley.edu/people/lab_detail.php?lab=54
http://fisher.berkeley.edu/cteg/hlab.html
Dept. personal page: 
http://ib.berkeley.edu/people/students/person_detail.php?person=370
Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html
Lab phone: 510-643-6299
Dept. fax: 510-643-6264
Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

-----------------------------------------------------
"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 
14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
====================================================


From josh.dukes at microvu.com  Tue Feb 17 15:47:52 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Tue, 17 Feb 2009 12:47:52 -0800
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <4993DE39.8030200@cosc.canterbury.ac.nz>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
Message-ID: <20090217124752.2d75f454@microvu.com>

What kind of cad are you focused on? Mechanical cad, architecutal cad,
or something else? If you're interested there have been some
experiments with blender
http://projects.blender.org/projects/blendercad/
http://blenderartists.org/forum/showthread.php?t=65559

Unfortunately I don't think anything ever came out of those. There's also a 2d cad called pythoncad, 
http://www.pythoncad.org/
There's also Salome, which seems to have a python interface. Basically though, there isn't anything good right now but I'd love to see this.

On Thu, 12 Feb 2009 21:30:49 +1300
greg <greg at cosc.canterbury.ac.nz> wrote:

> rantingrick wrote:
> 
> > It has long been my dream to create an open source 3D CAD program
> > and
> > 
> > I have a real good idea of the UI design
> 
> Have you seen Sketchup?
> 
>     http://sketchup.google.com/
> 
> It has an amazingly intuitive user interface, much better
> than any other 3D modeller I've seen. Anyone thinking of
> designing a 3D app would do well to study it closely, IMO.
> 
> Something with a Sketchup-like UI but designed for serious
> CAD work would be an incredibly good thing to have.
> 
> In any case, your project sounds interesting, and I'll
> be happy to discuss ideas if you want.
> 


-- 

Josh Dukes
MicroVu IT Department


From robert.kern at gmail.com  Tue Feb 17 16:17:00 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 15:17:00 -0600
Subject: pythonic array subsetting
In-Reply-To: <499B1FB7.4000701@berkeley.edu>
References: <499A560C.4000209@berkeley.edu>	<499A5A73.4030905@islandtraining.com>
	<499B1FB7.4000701@berkeley.edu>
Message-ID: <gnf9gf$o9v$1@ger.gmane.org>

On 2009-02-17 14:36, Nick Matzke wrote:
> Looks like "compress" is the right numpy function, but it took forever
> for me to find it...
>
> x = array([[1,2,3], [4,5,6], [7,8,9]], dtype=float)
> compress([1,2], x, axis=1)
>
> result:
> array([[ 1., 2.],
> [ 4., 5.],
> [ 7., 8.]])

No, that's actually not correct. compress() takes a boolean mask, not integer 
indices. It just happens to be the case that compress() implicitly appends 
Falses to the end if the lengths don't match. Also, numpy indices are 0-indexed 
just like most Python sequences.

If you need to specify integer indices, you need this:

In [4]: x[:,[0,1]]
Out[4]:
array([[ 1.,  2.],
        [ 4.,  5.],
        [ 7.,  8.]])

If you have more numpy questions, you should ask on the numpy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From thomasmallen at gmail.com  Tue Feb 17 16:46:41 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 13:46:41 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
Message-ID: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>

I must not be understanding something. This is a simple recursive
function that prints all HTML files in argv[1] as its scans the
directory's contents. Why do I get a RuntimeError for recursion depth
exceeded?

#!/usr/bin/env python

import os, sys

def main():
    absToRel(sys.argv[1], sys.argv[2])

def absToRel(dir, root):
    for filename in os.listdir(dir):
        if os.path.isdir(filename):
            absToRel(filename, root)
        else:
            if(filename.endswith("html") or filename.endswith("htm")):
                print filename

if __name__ == "__main__":
    main()


From ntwrkd at gmail.com  Tue Feb 17 16:55:28 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Tue, 17 Feb 2009 13:55:28 -0800
Subject: Jython Dev in Eclipse
Message-ID: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>

Does anyone use Pydev or JyDT for Eclipse.
Can you recommend one against the other?


From martin at v.loewis.de  Tue Feb 17 17:05:42 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 17 Feb 2009 23:05:42 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <499b34b6$0$27922$9b622d9e@news.freenet.de>

Thomas Allen wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):
>         if os.path.isdir(filename):

Perhaps you have a symlink somewhere that makes the tree appear to
have infinite depth?

Regards,
Martin


From lists at cheimes.de  Tue Feb 17 17:08:01 2009
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 17 Feb 2009 23:08:01 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <gnfcgh$1ua$1@ger.gmane.org>

Thomas Allen schrieb:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):
>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename


Why so complicated?

for root, dirs, files in os.walk(directory):
    for filename in files:
        if filename.endswith((".htm"), (".html")):
            print os.path.join(root, filename)

Christian



From thomasmallen at gmail.com  Tue Feb 17 17:08:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 14:08:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>

On Feb 17, 4:46?pm, Thomas Allen <thomasmal... at gmail.com> wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
>
> #!/usr/bin/env python
>
> import os, sys
>
> def main():
> ? ? absToRel(sys.argv[1], sys.argv[2])
>
> def absToRel(dir, root):
> ? ? for filename in os.listdir(dir):
> ? ? ? ? if os.path.isdir(filename):
> ? ? ? ? ? ? absToRel(filename, root)
> ? ? ? ? else:
> ? ? ? ? ? ? if(filename.endswith("html") or filename.endswith("htm")):
> ? ? ? ? ? ? ? ? print filename
>
> if __name__ == "__main__":
> ? ? main()

Please note that I'm not using os.walk(sys.argv[1]) because the
current depth of recursion is relevant to the transformation I'm
attempting. Basically, I'm transforming a live site to a local one and
the live site uses all absolute paths (not my decision...). I planned
on performing the replace like so for each line:

line.replace(root, "../" * depth)

So that a file in the top-level would simple remove all instances of
root, one level down would sub "../", etc.


From __peter__ at web.de  Tue Feb 17 17:31:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 17 Feb 2009 23:31:18 +0100
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <gnfdrg$62o$03$1@news.t-online.com>

Thomas Allen wrote:

> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):

          filename = os.path.join(dir, filename)

>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename
> 
> if __name__ == "__main__":
>     main()

Without the addition for a directory and a subdirectory of the same
name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result list
which triggers an absToRel() call on "dir" (the parent) ad infinitum.

Peter


From mcfletch at vrplumber.com  Tue Feb 17 17:37:05 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 17 Feb 2009 17:37:05 -0500
Subject: OpenGL in TK
In-Reply-To: <cc38d75f0901270222q1818eba4va7c674b8187f5f2@mail.gmail.com>
References: <cc38d75f0901270222q1818eba4va7c674b8187f5f2@mail.gmail.com>
Message-ID: <499B3C11.8090605@vrplumber.com>

Almar Klein wrote:
> Hi list!
>
> I am using pyOpenGL to do some 3D rendering. For now I am
> quite happy with the GLCanvas of wx, but I may want to publish
> some stuff later, and it would be nice if people would not need wx.
>
> I found that there used to be a TK widget called Togl, but it is not
> (anymore?) included in the TK package that comes with Python.
Togl was never included with Python, it used to be included with 
PyOpenGL, but it was always a royal PITA to build as it had to be built 
against the dev versions of Tcl and Tk that matched the Python ones.  
There's now a Togl project on SourceForge that provides a Win32 build of 
Togl.  There's a hacky script in PyOpenGL 3.x's "src/toglinstall" 
directory that tries to download the package from there and install it 
for you, but I'd expect it to be rather fragile and broken.

You wind up with an external binary download requirement one way or 
another.  Togl is pretty small compared to wxPython, of course, but 
you're looking a the same basic problem.
> Have others been able to use Togl, or any other OpenGL widget in
> TK?
I installed it using the above-mentioned hacky script a few months ago, 
checked that the wrapper (OpenGL/Tk) still worked with it, and then 
promptly ceased to particularly worry about it any more.  As has been 
the case for years, Togl needs an advocate who wants to work on the 
support in PyOpenGL, without that I just have no particular interest in 
maintaining it and the headache of maintenance has vastly outweighed my 
interest.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From thomasmallen at gmail.com  Tue Feb 17 17:39:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 14:39:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
Message-ID: <99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>

On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
> Thomas Allen wrote:
> > I must not be understanding something. This is a simple recursive
> > function that prints all HTML files in argv[1] as its scans the
> > directory's contents. Why do I get a RuntimeError for recursion depth
> > exceeded?
>
> > #!/usr/bin/env python
>
> > import os, sys
>
> > def main():
> > ? ? absToRel(sys.argv[1], sys.argv[2])
>
> > def absToRel(dir, root):
> > ? ? for filename in os.listdir(dir):
>
> ? ? ? ? ? filename = os.path.join(dir, filename)
>
> > ? ? ? ? if os.path.isdir(filename):
> > ? ? ? ? ? ? absToRel(filename, root)
> > ? ? ? ? else:
> > ? ? ? ? ? ? if(filename.endswith("html") or filename.endswith("htm")):
> > ? ? ? ? ? ? ? ? print filename
>
> > if __name__ == "__main__":
> > ? ? main()
>
> Without the addition for a directory and a subdirectory of the same
> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result list
> which triggers an absToRel() call on "dir" (the parent) ad infinitum.
>
> Peter

I have two problems in this case:

1. I don't know how to reliably map the current filename to an
absolute path beyond the top-most directory because my method of doing
so would be to os.path.join(os.getcwd(), filename)

2. For some reason, only one folder in the directory gets marked as a
directory itself when there are about nine others in the top-most
directory. I don't even know where to begin to solve this one.

I'm sure the first is an easy answer, but what do I need to do to
solve the second?


From semanticist at gmail.com  Tue Feb 17 17:43:54 2009
From: semanticist at gmail.com (Miles)
Date: Tue, 17 Feb 2009 17:43:54 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
Message-ID: <a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>

On Mon, Feb 16, 2009 at 8:35 PM, Helly John J. wrote:
> However, when I run python and try to import gdal, this is what happens:
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import gdal
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named gdal

What about "from osgeo import gdal"?

-Miles


From skippy.hammond at gmail.com  Tue Feb 17 17:44:13 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 18 Feb 2009 09:44:13 +1100
Subject: This application has failed to start because the application
	configuration is incorrect
In-Reply-To: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
Message-ID: <499B3DBD.90106@gmail.com>

On 18/02/2009 5:49 AM, Sam Clark wrote:
> I am receiving the message "This application has failed to start because
> the application configuration is incorrect" when I attempt to run a
> compiled Python program on another machine. I have used py2exe on both a
> 2.6.1 and a 2.6.0 version of the .py and .pyw files. Everything works
> great on the machine where Python 2.6 is loaded, but fails on machines
> where I copy the .exe to the machine. I'm a beginner at python
> programming. In fact this is my first packaged program. Any thoughts at
> a beginners level would be helpful.

This will be due to the C runtime library not being installed correctly 
on the target machine.  Python 2.6 has this problem more than earlier 
versions (due to the compiler used to build it) and the best way to 
address it isn't really clear yet unless you are willing to have them 
install these libraries via another Microsoft supplied installer. 
Probably the easiest workaround is to use Python 2.5 in the short term...

Mark


From __peter__ at web.de  Tue Feb 17 18:05:18 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 00:05:18 +0100
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
Message-ID: <gnffr7$aue$00$1@news.t-online.com>

Thomas Allen wrote:

> On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
>> Thomas Allen wrote:
>> > I must not be understanding something. This is a simple recursive
>> > function that prints all HTML files in argv[1] as its scans the
>> > directory's contents. Why do I get a RuntimeError for recursion depth
>> > exceeded?
>>
>> > #!/usr/bin/env python
>>
>> > import os, sys
>>
>> > def main():
>> > absToRel(sys.argv[1], sys.argv[2])
>>
>> > def absToRel(dir, root):
>> > for filename in os.listdir(dir):
>>
>> filename = os.path.join(dir, filename)
>>
>> > if os.path.isdir(filename):
>> > absToRel(filename, root)
>> > else:
>> > if(filename.endswith("html") or filename.endswith("htm")):
>> > print filename
>>
>> > if __name__ == "__main__":
>> > main()
>>
>> Without the addition for a directory and a subdirectory of the same
>> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result
>> list which triggers an absToRel() call on "dir" (the parent) ad
>> infinitum.
>>
>> Peter
> 
> I have two problems in this case:
> 
> 1. I don't know how to reliably map the current filename to an
> absolute path beyond the top-most directory because my method of doing
> so would be to os.path.join(os.getcwd(), filename)

Don't make things more complicated than necessary. If you can do
os.listdir(somedir) you can also do [os.path.join(somedir, fn) for fn in
os.listdir(somedir)].
 
> 2. For some reason, only one folder in the directory gets marked as a
> directory itself when there are about nine others in the top-most
> directory. I don't even know where to begin to solve this one.
> 
> I'm sure the first is an easy answer, but what do I need to do to
> solve the second?

If you solve the first properly the second might magically disappear. This
is what my crystal ball tells me because there is no code in sight...

Peter


From lionel.keene at gmail.com  Tue Feb 17 18:08:31 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 17 Feb 2009 15:08:31 -0800 (PST)
Subject: numpy.memmap advice?
Message-ID: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>

Hello all,

On a previous thread (http://groups.google.com/group/comp.lang.python/
browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
binary data. Briefly, my data consists of complex numbers, 32-bit
floats for real and imaginary parts. The data is stored as 4 bytes
Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
row-major format. I needed to read the data in as two separate numpy
arrays, one for real values and one for imaginary values.

There were several very helpful performance tips offered, and one in
particular I've started looking into. The author suggested a
"numpy.memmap" object may be beneficial. It was suggested I use it as
follows:


descriptor = dtype([("r", "<f4"), ("i", "<f4")])
data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
print "First 100 real values:", data.r[:100]


I have two questions:
1) What is "recarray"?
2) The documentation for numpy.memmap claims that it is meant to be
used in situations where it is beneficial to load only segments of a
file into memory, not the whole thing. This is definately something
I'd like to be able to do as my files are frequently >1Gb. I don't
really see in the diocumentation how portions are loaded, however.
They seem to create small arrays and then assign the entire array
(i.e. file) to the memmap object. Let's assume I have a binary data
file of complex numbers in the format described above, and let's
assume that the size of the complex data array (that is, the entire
file) is 100x100 (rows x columns). Could someone please post a few
lines showing how to load the top-left 50 x 50 quadrant, and the lower-
right 50 x 50 quadrant into memmap objects? Thank you very much in
advance!

-L


From mike.barry at gmail.com  Tue Feb 17 18:10:50 2009
From: mike.barry at gmail.com (mbarry)
Date: Tue, 17 Feb 2009 15:10:50 -0800 (PST)
Subject: _socket.so source?
Message-ID: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>

Hello,


The socket module in Python uses _socket.so for most of its behavior.
I want to modify the code that generates the _socket.so file.
I need the source file and instructions on how to compile and build
_socket.so for Windows.
Can anyone point me to where I can find the source and/or
documentation for compiling a python shared object on Windows?

Thanks
-Mike


From james at agentultra.com  Tue Feb 17 18:12:57 2009
From: james at agentultra.com (J Kenneth King)
Date: Tue, 17 Feb 2009 15:12:57 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
Message-ID: <878wo4verq.fsf@agentultra.com>


I recently started a project called TracShell
(http://code.google.com/p/tracshell) where I make heavy use of the
xmlrpclib core module.

When the number of RPC calls was small, wrapping each call in try/except
was acceptable. However, this obviously will duplicate code all over the
place. There are only ever two exceptions that the module itself will
throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
but not show stoppers.

To combat the duplication, my clever idea was to use a function
decorator to wrap any function that used xmlrpclib calls:

def catch_errors(fn):
    """
    A decorator to catch typical xmlrpclib exceptions
    """
    def wrapped(*args, **kwargs):
        try:
            return fn(*args, **kwargs)
        except xmlrpclib.ProtocolError, e:
            print "There was a problem communicating with the server."
            print "URL: %s" % e.url
            print "Headers: %s" % e.headers
            print "Error code: %d" % e.errcode
            print "Error message: %s" % e.errmsg
            print "Please file a report with the TracShell developers."
            pass
        except xmlrpclib.Fault, e:
            print "A fault ocurred"
            print "Fault code: %d" % e.faultCode
            print "Fault string: %s" % e.faultString
            print "If you think this message is the result of an error,"
            print "please file a report with the TracShell developers."
            pass
    return wrapped

Maybe I could rename the decorator to something meaningful, but besides
that it works pretty well. Now any function I write in my class that
uses RPC calls can be wrapped by this decorator and have the exception
handling done in a uniform way for these particular exceptions.

I was just curious if other Pythonistas out there used the same idea or
have a better one. Thoughts?


From rolf.oltmans at gmail.com  Tue Feb 17 18:15:56 2009
From: rolf.oltmans at gmail.com (Oltmans)
Date: Tue, 17 Feb 2009 15:15:56 -0800 (PST)
Subject: Searching Google?
Message-ID: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>

Hey all,

I want to search Google.com using a specific keyword and I just want
to read back the response using Pyhon. After some thorough Googling I
realized that I probably need a Search API key to do that. Is that
correct? Now, I don't have a search key so is there a workaround?
Please enlighten me.

Thanks,
Oltmans


From robert.kern at gmail.com  Tue Feb 17 18:22:09 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 17 Feb 2009 17:22:09 -0600
Subject: numpy.memmap advice?
In-Reply-To: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <gnfgr2$hsb$1@ger.gmane.org>

On 2009-02-17 17:08, Lionel wrote:
> Hello all,
>
> On a previous thread (http://groups.google.com/group/comp.lang.python/
> browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> binary data. Briefly, my data consists of complex numbers, 32-bit
> floats for real and imaginary parts. The data is stored as 4 bytes
> Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> row-major format. I needed to read the data in as two separate numpy
> arrays, one for real values and one for imaginary values.

I don't have time to answer your questions now, so you should ask on the numpy 
mailing list where others can jump in.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From semanticist at gmail.com  Tue Feb 17 18:24:35 2009
From: semanticist at gmail.com (Miles)
Date: Tue, 17 Feb 2009 18:24:35 -0500
Subject: print string as raw string
In-Reply-To: <afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>
References: <slrngpkvb1.488.mirko-usenet-200902@dziadzka.de>
	<6vvifkFm4k0vU1@mid.uni-berlin.de>
	<01aaa153$0$20629$c3e8da3@news.astraweb.com>
	<afWdnUdpnZl_lQbUnZ2dnUVZ_r3inZ2d@pdx.net>
Message-ID: <a49e45f50902171524y5cbbd2f1x8ac2705529a6a3f4@mail.gmail.com>

On Tue, Feb 17, 2009 at 2:01 PM, Scott David Daniels wrote:
>>> Mirko Dziadzka schrieb:
>>>>
>>>> I'm trying to find a way to output strings in the raw-string format,
>>>> e.g.
>>>> print_as_raw_string(r"\.") should output r"\." instead of "\\."  ...
>
> ...
> The big issue I see is that lots of values cannot be represented
> as raw strings.  Your code checks for a final '\', but many "control"
> characters and the quote marks are also at issue.
>
> raw_repr('["\']a\x13\xfebc\\de') should contain several nasty cases.

It seems to me that a raw_repr should only be required to be able to
encode strings that are representable as raw strings in the first
place.  Here's mine:

def raw_repr(s):
    if s and s[-1] == '\\':
        raise ValueError('No raw string representation; '
                         'string ends in backslash')
    # If you want to test for control and non-ASCII characters to raise
    # an exception, that's up to you
    quote = None
    if '\n' not in s:
        if "'" not in s:
            quote = "'"
        elif '"' not in s:
            quote = '"'
    if not quote:
        if "'''" not in s:
            quote = "'''"
        elif '"""' not in s:
            quote = '"""'
    if not quote:
        raise ValueError('No raw string representation; '
                         'string contains unescapable quote characters')
    return 'r' + quote + s + quote

>>> print raw_repr(r"1\2'3\n")
r"1\2'3\n"
>>> print raw_repr(r'''"What's up," he said.''')
r'''"What's up," he said.'''
>>> # valid raw string, left as an exercise for the reader:
... print raw_repr(r'"""'"'''") # ;)
Traceback (most recent call last):
  File "<stdin>", line 2, in ?
  File "<stdin>", line 19, in raw_repr
ValueError: No raw string representation; string contains unescapable
quote characters

-Miles


From __peter__ at web.de  Tue Feb 17 18:26:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 00:26:07 +0100
Subject: Speedup Bitmap Parser
References: <58aed622-cf81-4747-ac54-86badef1c8dc@s20g2000yqh.googlegroups.com>
	<c1d4703f-cc0f-40de-bac1-d4e7ff84f8c5@v19g2000yqn.googlegroups.com>
	<e420669d-4481-46ba-9c63-b9e52d68d4f8@h16g2000yqj.googlegroups.com>
	<ba37f3b1-ec95-41c6-a102-e65c8f366c7f@13g2000yql.googlegroups.com>
	<4c467175-092f-423d-8c0c-cdbffc8579c4@c12g2000yqj.googlegroups.com>
	<12765e3f-a324-4621-b110-b40bd57acff0@s20g2000yqh.googlegroups.com>
	<5b94254a-e8ea-469d-8e07-2f3dc778baa8@v39g2000yqm.googlegroups.com>
	<41a631e9-9e57-45f0-9ec1-835114e3f3de@l39g2000yqn.googlegroups.com>
	<5a3cfd4d-7a1c-4afe-a237-60533e8d4f8a@a12g2000yqm.googlegroups.com>
Message-ID: <gnfh28$tl5$01$1@news.t-online.com>

Jayson Santos wrote:

> On 17 fev, 14:00, bearophileH... at lycos.com wrote:
>> Jayson Santos:
>>
>> > After changing my code to use only functions instead classes
>> > my code is too much faster.
>> > Here cProfile statistcs:
>> > Using old code : 633608 function calls in 1.361 CPU seconds
>> > Using new code: 475487 function calls in 0.800 CPU seconds
>>
>> If you show a pastebin of the new version (you can also paste it, for
>> reference for future people, when the pastebin will be deleted),
>> probably there are ways to improve it more.
>> And I also suggest you to try Psyco. (Someone recently has shown here
>> a compiled version for Windows of Psyco for Python 2.6).
>>
>> Bye,
>> bearophile
> 
> I'm using linux with python 2.5
> Here is the result using psyco.full(): 93 function calls in 0.243 CPU
> seconds
> And here is the final code: http://pastebin.com/f3e20d669

I think you are heading in the wrong direction. Turning classes into
dictionaries in code that runs just once (like the Bitmap class) makes your
program harder to read, not faster. Adding globals makes it non-reentrant.
You should really concentrate your optimization efforts on the inner loops.
Here avoiding loops written in Python and using tuples instead of a custom
class may offer significant speedups:

def bitmap_line(s):
    a = array.array("B")
    a.fromstring(s)
    return zip(*(iter(a),)*3)
 
Note that I didn't test or time it because your script requires other
changes to run on AMD64.

Peter


From nick.bastin at gmail.com  Tue Feb 17 18:29:46 2009
From: nick.bastin at gmail.com (Nicholas Bastin)
Date: Tue, 17 Feb 2009 18:29:46 -0500
Subject: Making extension modules play nice with help()?
Message-ID: <66d0a6e10902171529g53b0ac34h650ee03ace07ff28@mail.gmail.com>

I've always provided doc strings through PyMethodDef in the past, without
paying much attention to what happens in help() - they print fine when you
just use the doc string.  However, in help, you end up with methods that
have an indeterminate signature.  We generally make doc strings that look
like:
"get_root_calls() -> [ptv.Call, ...]"
"Returns all root calls for transactions in the trace."

Which works fine if you just print get_root_calls().__doc__ or somesuch, but
works out quite lousy if you use help():

|  get_root_calls(...)
|      get_root_calls() -> [ptv.Call, ...]
|      Returns all root calls for transactions in the trace.

So we end up with the method signature twice - once from help(), which is
meaningless (assuming a non-empty argument list), and once from the doc
string, which is actually useful.  Is there any way to either a) teach the
proper method signature to help(), or b) override it.

Also, while PyMethodDef has a nice place to put a doc string,
PyMappingMethods and tp_iter have no such place, and so we end up with
things like:

 |  __getitem__(...)
 |      x.__getitem__(y) <==> x[y]
 |
 |  __iter__(...)
 |      x.__iter__() <==> iter(x)

Which is decidedly unhelpful.  Can I grab the Type after it has been readied
and replace some attributes somewhere to put new strings in these places?

Of course, I can always cover the C extension module in a thin veneer of
python, but that starts to become a significant performance problem (not to
mention a maintenance nightmare).

--
Nick
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From gagsl-py2 at yahoo.com.ar  Tue Feb 17 18:29:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 21:29:50 -0200
Subject: Upgrading standard library module
References: <d61bdcce-42ad-47db-b139-2b93c2005544@u18g2000pro.googlegroups.com>
	<c8203e52-9f09-4555-9461-c104cd07ee5e@l39g2000yqn.googlegroups.com>
	<a35a9668-fcd7-42f6-a891-2f2b028fed0f@w24g2000prd.googlegroups.com>
	<mailman.95.1234859707.11746.python-list@python.org>
	<08e76f94-7d31-4200-a774-c5c41d72f91f@r15g2000prd.googlegroups.com>
Message-ID: <op.upirj0dlx6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 13:37:12 -0200, Bryan <bryanvick at gmail.com> escribi?:
> On Feb 17, 12:34?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Fri, 13 Feb 2009 20:17:35 -0200, Bryan <bryanv... at gmail.com>  
>> escribi?:
>> > On Feb 13, 1:52?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
>> >> On Feb 13, 12:42?pm, Bryan <bryanv... at gmail.com> wrote:
>>
>> >> > I have a Python v2.5.2 server running and I found some undesirable
>> >> > behavior in the xmlrpclib module that is included with that >> >  
>> version of
>> >> > Python. ?The xmlrpclib version that is included with Python 2.6
>> >> > changes the behavior for the better. ?
>>
>> > I also did not see anything in the revision log in the source file
>> > about this change.
>>
>> It was rev.52790:http://svn.python.org/view?rev=52790&view=rev
>> The tracker item has some background:http://bugs.python.org/issue1070046
>
> Can you give me a quick run down of your process for researching this
> information?  I don't spend much time looking at the svn or bug
> tracker.

First, I looked the section in xmlrpclib.py that you were refering to.  
Then, over a checked out copy of the sources, I ran:
svn blame xmlrpclib.py
and I got the revision those lines were last modified. Then from the log  
message of rev. 52790 I got the reference to the tracker item.

> Should I be checking there before posting?

It's a good idea to check first, but don't refrain from posting here.

-- 
Gabriel Genellina



From lists at cheimes.de  Tue Feb 17 18:47:16 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 00:47:16 +0100
Subject: _socket.so source?
In-Reply-To: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
References: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
Message-ID: <gnfia4$llp$1@ger.gmane.org>

mbarry schrieb:
> Hello,
> 
> 
> The socket module in Python uses _socket.so for most of its behavior.
> I want to modify the code that generates the _socket.so file.
> I need the source file and instructions on how to compile and build
> _socket.so for Windows.
> Can anyone point me to where I can find the source and/or
> documentation for compiling a python shared object on Windows?

You need the Python source tree (download the .tar.gz) and the correct
compiler in order to build a .dll / .pyd file on Windows. For Python 2.4
and 2.5 you need Visual Studio 2003 (VC7.1), for Python 2.6 and 3.0 you
have to install Visual Studio 2008 (VC9).

The code for the _socket extension is in the Modules/ subdirectory of
the source tree.

Christian



From thomasmallen at gmail.com  Tue Feb 17 18:52:56 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 15:52:56 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
Message-ID: <912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>

On Feb 17, 6:05?pm, Peter Otten <__pete... at web.de> wrote:
> Thomas Allen wrote:
> > On Feb 17, 5:31?pm, Peter Otten <__pete... at web.de> wrote:
> >> Thomas Allen wrote:
> >> > I must not be understanding something. This is a simple recursive
> >> > function that prints all HTML files in argv[1] as its scans the
> >> > directory's contents. Why do I get a RuntimeError for recursion depth
> >> > exceeded?
>
> >> > #!/usr/bin/env python
>
> >> > import os, sys
>
> >> > def main():
> >> > absToRel(sys.argv[1], sys.argv[2])
>
> >> > def absToRel(dir, root):
> >> > for filename in os.listdir(dir):
>
> >> filename = os.path.join(dir, filename)
>
> >> > if os.path.isdir(filename):
> >> > absToRel(filename, root)
> >> > else:
> >> > if(filename.endswith("html") or filename.endswith("htm")):
> >> > print filename
>
> >> > if __name__ == "__main__":
> >> > main()
>
> >> Without the addition for a directory and a subdirectory of the same
> >> name, "dir/dir", os.listdir("dir") has "dir" (the child) in the result
> >> list which triggers an absToRel() call on "dir" (the parent) ad
> >> infinitum.
>
> >> Peter
>
> > I have two problems in this case:
>
> > 1. I don't know how to reliably map the current filename to an
> > absolute path beyond the top-most directory because my method of doing
> > so would be to os.path.join(os.getcwd(), filename)
>
> Don't make things more complicated than necessary. If you can do
> os.listdir(somedir) you can also do [os.path.join(somedir, fn) for fn in
> os.listdir(somedir)].
>
> > 2. For some reason, only one folder in the directory gets marked as a
> > directory itself when there are about nine others in the top-most
> > directory. I don't even know where to begin to solve this one.
>
> > I'm sure the first is an easy answer, but what do I need to do to
> > solve the second?
>
> If you solve the first properly the second might magically disappear. This
> is what my crystal ball tells me because there is no code in sight...
>
> Peter

I'm referring to the same code, but with a print:

for file in os.listdir(dir):
    if os.path.isdir(file):
        print "D", file

in place of the internal call to absToRel...and only one line prints
such a message. I mean, if I can't trust my OS or its Python
implementation (on a Windows box) to recognize a directory, I'm
wasting everyone's time here.

In any case, is this the best way to go about the problem in general?
Or is there already a way to recursively walk a directory, aware of
the current depth?

Thanks,
Thomas


From gagsl-py2 at yahoo.com.ar  Tue Feb 17 19:00:26 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 17 Feb 2009 22:00:26 -0200
Subject: List of locale values for locale.setlocale() under Windows
References: <1234900820.29552.1300909493@webmail.messagingengine.com>
Message-ID: <op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 18:00:19 -0200, <python at bdurham.com> escribi?:

>>>> locale.getlocale()
> ('English_United States', '1252')
> Any suggestions on where I can find the official list of locale
> codes for Windows XP (or better yet, all versions of Windows XP
> or later)?

Are you looking for this?
http://msdn.microsoft.com/en-us/library/hzz3tw78(VS.80).aspx

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Tue Feb 17 19:04:08 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Wed, 18 Feb 2009 00:04:08 +0000
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
Message-ID: <499B5078.2050908@mrabarnett.plus.com>

Thomas Allen wrote:
> I must not be understanding something. This is a simple recursive
> function that prints all HTML files in argv[1] as its scans the
> directory's contents. Why do I get a RuntimeError for recursion depth
> exceeded?
> 
> #!/usr/bin/env python
> 
> import os, sys
> 
> def main():
>     absToRel(sys.argv[1], sys.argv[2])
> 
> def absToRel(dir, root):
>     for filename in os.listdir(dir):

os.listdir() returns a list of filenames, not filepaths. Create the
filepath with os.path.join(dir, filename).

>         if os.path.isdir(filename):
>             absToRel(filename, root)
>         else:
>             if(filename.endswith("html") or filename.endswith("htm")):
>                 print filename
> 
> if __name__ == "__main__":
>     main()
> 



From lists at cheimes.de  Tue Feb 17 19:05:57 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 01:05:57 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>	<gnfdrg$62o$03$1@news.t-online.com>	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
Message-ID: <gnfjd5$olr$1@ger.gmane.org>

Thomas Allen wrote:
> I'm referring to the same code, but with a print:
> 
> for file in os.listdir(dir):
>     if os.path.isdir(file):
>         print "D", file
> 
> in place of the internal call to absToRel...and only one line prints
> such a message. I mean, if I can't trust my OS or its Python
> implementation (on a Windows box) to recognize a directory, I'm
> wasting everyone's time here.

You are under a wrong assumption. You think os.listdir() returns a list
of absolute path elements. In fact it returns just a list of names. You
have to os.path.join(dir, file) to get an absolute path.

Anyway stop reinventing the wheel and use os.walk() as I already
explained. You can easily spot the depth with "directory.count(os.sep)".
 os.path.normpath() helps you to sanitize the path before counting the
number of os.sep.

Christian



From curt.hash at gmail.com  Tue Feb 17 19:43:31 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Tue, 17 Feb 2009 17:43:31 -0700
Subject: Searching Google?
In-Reply-To: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
Message-ID: <736698790902171643l58828125q56829ce07b1c7e71@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:15 PM, Oltmans <rolf.oltmans at gmail.com> wrote:
>
> Hey all,
>
> I want to search Google.com using a specific keyword and I just want
> to read back the response using Pyhon. After some thorough Googling I
> realized that I probably need a Search API key to do that. Is that
> correct? Now, I don't have a search key so is there a workaround?
> Please enlighten me.
>
> Thanks,
> Oltmans
> --
> http://mail.python.org/mailman/listinfo/python-list

You just need to change your User-Agent so that Google doesn't know a
Python script is making the request:

import urllib2
headers = {'User-Agent' : 'Mozilla/5.0 (X11; U; Linux i686; en-US;
rv:1.9.0.6) Gecko/2009020911 Ubuntu/8.04 (hardy) Firefox/3.0.6'}
query = 'foo'
req = urllib2.Request('http://www.google.com/search?&q=' + query,
headers=headers)
response = urllib2.urlopen(req)
results = response.read()


From benjamin.kaplan at case.edu  Tue Feb 17 19:59:09 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 17 Feb 2009 19:59:09 -0500
Subject: Jython Dev in Eclipse
In-Reply-To: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>
References: <f257b9ab0902171355t1ab9b93dib7d4417244f79d51@mail.gmail.com>
Message-ID: <ec96e1390902171659y1c23f2e5md9144cd9c77a76d6@mail.gmail.com>

On Tue, Feb 17, 2009 at 4:55 PM, ntwrkd <ntwrkd at gmail.com> wrote:

> Does anyone use Pydev or JyDT for Eclipse.
> Can you recommend one against the other?


JyDT hasn't had a release in the last few years. I don't think it will work
with the new versions of eclipse or Jython.

--
> http://mail.python.org/mailman/listinfo/python-list
>
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From dotancohen at gmail.com  Tue Feb 17 20:10:24 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Wed, 18 Feb 2009 03:10:24 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <880dece00902171710v145d37a3j56166103aabecc5d@mail.gmail.com>

> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps.

If you are really serious, then I am waiting for a Linux-compatible
Solidworks replacement. That means that I can work and collaborate
with other Solidworks users in Solidworks' native format, with no
excuses to the other engineers.

If you come up with such a best, say in the next three years, then I
will donate to your cause three times the cost of a Solidworks license
at that time. There are literally hundreds of other engineers that
would do the same as I would do. When you go for VC keep that in mind.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From gtill60 at gmail.com  Tue Feb 17 20:18:11 2009
From: gtill60 at gmail.com (gtillmon)
Date: Tue, 17 Feb 2009 17:18:11 -0800 (PST)
Subject: Directory
Message-ID: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>

Hello.  I am new to the Python language.
I would like to know how to display and store the path of each mondule
that is called.
Similar to the old READY TRACE in COBOL of long ago.

Thanks,
George


From http  Tue Feb 17 20:36:07 2009
From: http (Paul Rubin)
Date: 17 Feb 2009 17:36:07 -0800
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
Message-ID: <7xr61w8r20.fsf@ruckus.brouhaha.com>

Thomas Allen <thomasmallen at gmail.com> writes:
> attempting. Basically, I'm transforming a live site to a local one and

Something wrong with wget -R ?


From thomasmallen at gmail.com  Tue Feb 17 20:46:06 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 17:46:06 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
	<mailman.165.1234915567.11746.python-list@python.org>
Message-ID: <052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>

On Feb 17, 7:05?pm, Christian Heimes <li... at cheimes.de> wrote:
> Thomas Allen wrote:
> > I'm referring to the same code, but with a print:
>
> > for file in os.listdir(dir):
> > ? ? if os.path.isdir(file):
> > ? ? ? ? print "D", file
>
> > in place of the internal call to absToRel...and only one line prints
> > such a message. I mean, if I can't trust my OS or its Python
> > implementation (on a Windows box) to recognize a directory, I'm
> > wasting everyone's time here.
>
> You are under a wrong assumption. You think os.listdir() returns a list
> of absolute path elements. In fact it returns just a list of names. You
> have to os.path.join(dir, file) to get an absolute path.
>
> Anyway stop reinventing the wheel and use os.walk() as I already
> explained. You can easily spot the depth with "directory.count(os.sep)".
> ?os.path.normpath() helps you to sanitize the path before counting the
> number of os.sep.
>
> Christian

If you'd read the messages in this thread you'd understand why I'm not
using os.walk(): I'm not using it because I need my code to be aware
of the current recursion depth so that the correct number of "../" are
substituted in.

Also, somebody mentioned wget -R...did you mean wget -r? In any case,
I have all of these files locally already and am trying to replace
absolute paths with relative ones so that a colleague can present some
website content at a location with no internet.

Thomas


From python at bdurham.com  Tue Feb 17 20:53:59 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 20:53:59 -0500
Subject: List of locale values for locale.setlocale() under Windows
In-Reply-To: <op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>
References: <1234900820.29552.1300909493@webmail.messagingengine.com>
	<op.upisy0xnx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1234922039.4722.1300977805@webmail.messagingengine.com>

Gabriel,

> Are you looking for this?
> http://msdn.microsoft.com/en-us/library/hzz3tw78(VS.80).aspx

Yes! Wonderful! 

Thank you,

Malcolm


From lists at cheimes.de  Tue Feb 17 21:08:58 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 03:08:58 +0100
Subject: "Maximum recursion depth exceeded"...why?
In-Reply-To: <052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>	<gnfdrg$62o$03$1@news.t-online.com>	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>	<gnffr7$aue$00$1@news.t-online.com>	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>	<mailman.165.1234915567.11746.python-list@python.org>
	<052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
Message-ID: <gnfqjq$crm$1@ger.gmane.org>

Thomas Allen wrote:
> If you'd read the messages in this thread you'd understand why I'm not
> using os.walk(): I'm not using it because I need my code to be aware
> of the current recursion depth so that the correct number of "../" are
> substituted in.

I'm well aware of your messages and your requirements. However you
didn't either read or understand what I was trying to tell you. You
don't need to know the recursion depths in order to find the correct
number of "../".


base = os.path.normpath(base)
baselevel = root.count(os.sep)

for root, dirs, files in os.walk(base):
    level = root.count(os.sep) - baselevel
    offset = level * "../"
    ...

See?

Christian



From thomasmallen at gmail.com  Tue Feb 17 21:19:55 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Tue, 17 Feb 2009 18:19:55 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<gnfdrg$62o$03$1@news.t-online.com>
	<99af8e87-784f-4373-8f3d-3244084290ae@o11g2000yql.googlegroups.com>
	<gnffr7$aue$00$1@news.t-online.com>
	<912a40f6-0696-4f08-966a-bc3217f9ea34@u13g2000yqg.googlegroups.com>
	<mailman.165.1234915567.11746.python-list@python.org>
	<052caf2f-26c5-4602-8490-db80626c3dfd@w34g2000yqm.googlegroups.com>
	<mailman.170.1234922949.11746.python-list@python.org>
Message-ID: <ea3be7b0-f6bc-4949-b9d3-63d6a5687d3e@v19g2000yqn.googlegroups.com>

On Feb 17, 9:08?pm, Christian Heimes <li... at cheimes.de> wrote:
> Thomas Allen wrote:
> > If you'd read the messages in this thread you'd understand why I'm not
> > using os.walk(): I'm not using it because I need my code to be aware
> > of the current recursion depth so that the correct number of "../" are
> > substituted in.
>
> I'm well aware of your messages and your requirements. However you
> didn't either read or understand what I was trying to tell you. You
> don't need to know the recursion depths in order to find the correct
> number of "../".
>
> base = os.path.normpath(base)
> baselevel = root.count(os.sep)
>
> for root, dirs, files in os.walk(base):
> ? ? level = root.count(os.sep) - baselevel
> ? ? offset = level * "../"
> ? ? ...
>
> See?
>
> Christian

Very clever (and now seemingly obvious)! That certainly is one way to
measure directory depth; I hadn't thought of counting the separator.
Sorry that I misunderstood what you meant there.

Thanks,
Thomas


From python at bdurham.com  Tue Feb 17 22:02:24 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 22:02:24 -0500
Subject: Questions on Python 2.6.1 locale module
Message-ID: <1234926144.17948.1300984725@webmail.messagingengine.com>

I've read the latest official locale documentation[1], googled
for additional resources, and have the following questions:
1. Does the following warning still apply to recent releases of
Python (and if so, is this a Python issue, a generic C runtime
issue, or a platform specific C runtime issue)
"... some implementation are broken in such a way that frequent
locale changes may cause core dumps. This makes the locale
somewhat painful to use correctly."
2. Is there a locale-like module that uses hardcoded/cached
locale settings that might support the ability to have different
locale objects? Use cases for such a module:
- ability for threads to support independent locale-type
formatting (via their own private locale object instances)
- ability to generate multi-locale output without flipping
between locales (expensive and potentially buggy)
Note: I understand this wouldn't be a perfect solution given that
the string module's 'constants' are locale sensitive.
3. Where can I find examples of how to use the locale.format()
and locale.format_string() functions? (The documentation for
these functions is too terse for me to understand).
Thank you,
Malcolm
[1] http://docs.python.org/library/locale.html
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From wuwei23 at gmail.com  Tue Feb 17 22:03:51 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:03:51 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
Message-ID: <cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>

On Feb 18, 11:36?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Thomas Allen <thomasmal... at gmail.com> writes:
> > attempting. Basically, I'm transforming a live site to a local one and
>
> Something wrong with wget -R ?

Did you mean wget -r ?

That will just grab the entire site, though. I'm guessing that Thomas'
function absToRel will eventually replace the print with something
that changes links accordingly so the local version is traversable.


From python at bdurham.com  Tue Feb 17 22:09:15 2009
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 17 Feb 2009 22:09:15 -0500
Subject: Best practice for upgrading the version of SQLite bundled with Python
	2.6.1
Message-ID: <1234926555.19179.1300986603@webmail.messagingengine.com>

Are there best practice recommendations for upgrading the version
of SQLite that comes bundled with versions of Python 2.5 and
later?
We're running Python 2.6.1 on Windows and Linux and using the
default version of SQLite that ship with this release.
Today, a new version of SQLite 3.6.11 was released. If we would
like to use this newer version of SQLite, what steps should we
follow for our Windows and Linux versions of Python 2.6.1?
Thank you,
Malcolm
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From wuwei23 at gmail.com  Tue Feb 17 22:28:08 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:28:08 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost> 
	<mailman.134.1234890640.11746.python-list@python.org>
Message-ID: <26c3659d-ce14-4375-9da7-d9fefc4748ac@a39g2000prl.googlegroups.com>

On Feb 18, 3:10?am, Robert Kern <robert.k... at gmail.com> wrote:
> Its public image definitely suffers from the impression that it's "an ORM" that
> can be compared on equal terms with packages that actually are just ORMs. I
> describe it as a very powerful toolkit for solving a wide variety of problems
> involving SQL databases. One of those tools happens to be an ORM.

I'm going to have to steal that description the next time I try to
sell a co-worker on the value of SQLAlchemy. There's always a strong
reaction against the mention of ORMs, generally along the lines of it
moving the programmer too far away from the real action. But my
experience is identical to both andrew's and your's; there is far far
more of value in SQLA than the ORM alone.




From Graham.Dumpleton at gmail.com  Tue Feb 17 22:34:39 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Tue, 17 Feb 2009 19:34:39 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
Message-ID: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>

Why is the multiprocessing module, ie., multiprocessing/process.py, in
_bootstrap() doing:

  os.close(sys.stdin.fileno())

rather than:

  sys.stdin.close()

Technically it is feasible that stdin could have been replaced with
something other than a file object, where the replacement doesn't have
a fileno() method.

In that sort of situation an AttributeError would be raised, which
isn't going to be caught as either OSError or ValueError, which is all
the code watches out for.

Graham


From Graham.Dumpleton at gmail.com  Tue Feb 17 22:47:14 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Tue, 17 Feb 2009 19:47:14 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
Message-ID: <d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>

On Feb 16, 9:27?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Feb 16, 10:34?am, rushen... at gmail.com wrote:
>
>
>
> > Hi everybody,
> > I am an engineer. I am trying to improve my software development
> > abilities. I have started programming with ruby. I like it very much
> > but i want to add something more. According to my previous research i
> > have designed a learning path for myself. It's like something below.
> > ? ? ? 1. Ruby (Mastering as much as possible)
> > ? ? ? 2. Python (Mastering as much as possible)
> > ? ? ? 3. Basic C++ or Basic Java
> > And the story begins here. As i search on the net, ?I have found that
> > because of the natural characteristics of python such as GIL, we are
> > not able to write multi threaded programs. Oooops, in a kind of time
> > with lots of cpu cores and we are not able to write multi threaded
> > programs. That is out of fashion. How a such powerful language doesn't
> > support multi threading. That is a big minus for python. But there is
> > something interesting, something like multi processing. But is it a
> > real alternative for multi threading. As i searched it is not, it
> > requires heavy hardware requirements (lots of memory, lots of cpu
> > power). Also it is not easy to implement, too much extra code...
>
> multiprocessing is already implemented for you in the standard
> library.
> Of course it does not require heavy hardware requirements.
>
> > After all of that, i start to think about omiting python from my
> > carrier path and directly choosing c++ or java. But i know google or
> > youtube uses python very much. How can they choose a language which
> > will be killed by multi threading a time in near future. I like python
> > and its syntax, its flexibility.
>
> > What do you think about multi threading and its effect on python. Why
> > does python have such a break and what is the fix. Is it worth to make
> > investment of time and money to a language it can not take advantage
> > of multi cores?
>
> You can take advantage of multi cores, just not with threads but with
> processes,
> which BTW is the right way to go in most situations. So (assuming you
> are not
> a troll) you are just mistaken in thinking that the only way to
> use multicores is via multithreading.

It is also a mistaken belief that you cannot take advantage of multi
cores with multiple threads inside of a single process using Python.

What no one seems to remember is that when calls are made into Python
extension modules implemented in C code, they have the option of
releasing the Python GIL. By releasing the Python GIL at that point,
it would allow other Python threads to run at the same time as
operations are being done in C code in the extension module.

Obviously if the extension module needs to manipulate Python objects
it will not be able to release the GIL, but not all extension modules
are going to be like this and could have quite sizable sections of
code that can run with the GIL released. Thus, you could have many
threads running at the same time in sections of C code, at same time
as well as currently delegated thread within Python code.

A very good example of this is when embeddeding Python inside of
Apache. So much stuff is actually done inside of Apache C code with
the GIL released, that there is more than ample opportunity for
multiple threads to be running across cores at the same time.

Graham



From wuwei23 at gmail.com  Tue Feb 17 22:56:21 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 17 Feb 2009 19:56:21 -0800 (PST)
Subject: How do I declare global vars or class vars in Python ?
References: <mailman.114.1234882494.11746.python-list@python.org>
Message-ID: <e798e1f4-e3d8-466d-979d-15bd8dd78cce@r37g2000prr.googlegroups.com>

On Feb 18, 12:54?am, Linuxguy123 <linuxguy... at gmail.com> wrote:
> The part I don't know to do is declare the variables, either as globals
> or as vars in a class. ?How is this done in Python without setting them
> to a value ?

Generally, you can use the object None to indicate that something has
no value:

class Something(object):
    def __init__(self, a=None, b=None):
        self.a, self.b = a, b
    def dosomething(self):
        # manipulate self.a & self.b here

def main():
    s = Something("value1", "value2")
    s.dosomething()



From sri_annauni at yahoo.co.in  Tue Feb 17 23:19:54 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Wed, 18 Feb 2009 09:49:54 +0530 (IST)
Subject: Python Module for console text formatting?
Message-ID: <867965.2501.qm@web7903.mail.in.yahoo.com>


Hi,
Does anyone know any python module other than 'ConsoleFormat0.1.1' used to format text on console?
For example, printing bold characters on console.

Thanks,
Srini


      Did you know? You can CHAT without downloading messenger. Go to http://in.webmessenger.yahoo.com/


From michele.simionato at gmail.com  Tue Feb 17 23:33:46 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Tue, 17 Feb 2009 20:33:46 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
Message-ID: <04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>

On Feb 18, 4:47?am, Graham Dumpleton <Graham.Dumple... at gmail.com>
wrote:
> It is also a mistaken belief that you cannot take advantage of multi
> cores with multiple threads inside of a single process using Python.
>
> What no one seems to remember is that when calls are made into Python
> extension modules implemented in C code, they have the option of
> releasing the Python GIL. By releasing the Python GIL at that point,
> it would allow other Python threads to run at the same time as
> operations are being done in C code in the extension module.

You are perfectly right and no one forgot this point,
I am sure. However I think we were answering to the question
"can pure Python code take advantage of multiple CPUs
via multithreading" and the answer is no. Of course a
C extension can do that, but that is beside the point.
It is still worth noticing - as you did -
that some well known Python (+C extension) library -
such as mod_wsgi - is already well equipped to manage
multithreading on multiple cores without any further
effort from the user. This is a good point.

                 Michele Simionato


From cto at openmigration.net  Tue Feb 17 23:34:34 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 17 Feb 2009 23:34:34 -0500
Subject: Python Module for console text formatting?
In-Reply-To: <867965.2501.qm@web7903.mail.in.yahoo.com>
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
Message-ID: <f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>

You can insert those codes just like you would any other character. If
there's enough interest I can whip up a wrapper library for you.

http://www.linux.gr/cgi-bin/man2html?console_codes+4

On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <
sri_annauni at yahoo.co.in> wrote:

>
> Hi,
> Does anyone know any python module other than 'ConsoleFormat0.1.1' used to
> format text on console?
> For example, printing bold characters on console.
>
> Thanks,
> Srini
>
>
>      Did you know? You can CHAT without downloading messenger. Go to
> http://in.webmessenger.yahoo.com/
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at
http://OpenMigration.net.
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From dhbaird at gmail.com  Wed Feb 18 01:13:00 2009
From: dhbaird at gmail.com (David Baird)
Date: Tue, 17 Feb 2009 22:13:00 -0800 (PST)
Subject: Announcing CVExp: A library for making linear programming easier
Message-ID: <f07ba408-091a-4a27-b0f5-468e9c4c9baf@i18g2000prf.googlegroups.com>

Here is the PyPI page:

    http://pypi.python.org/pypi/cvexp/0.1

And here is the homepage:

    http://www.aclevername.com/projects/cvexp/

CVExp currently supports solving linear, integer linear, and quadratic
optimization problems via lpsolve55, GLPK, and CVXOPT.  There are
packages readily available in Debian and Ubuntu for python-glpk and
python-cvxopt, so installation is easy on these platforms:

    apt-get install python-setuptools # for easy_install
    apt-get install python-glpk python-cvxopt
    easy_install cvexp

Here is a quick example of using CVExp+GLPK to solve a problem:

from cvexp.builders import var
from cvexp.builders import integer
from cvexp.builders import minimize
from cvexp.translate_glpk import solve

X = var('X') # the 'X' name is optional
Y = var('Y') # ...and so is 'Y'

sol = solve((
             Y + 0.1 == X,
             Y >= 9.8 - X,
             integer(Y),
             minimize(Y),
           ), out_filename='problem.out') # out_filename is optional
print 'X =', sol[X] # >>> 5.1
print 'Y =', sol[Y] # >>> 5


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 01:42:15 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 04:42:15 -0200
Subject: Best practice for upgrading the version of SQLite bundled with
	Python 2.6.1
References: <1234926555.19179.1300986603@webmail.messagingengine.com>
Message-ID: <op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 01:09:15 -0200, <python at bdurham.com> escribi?:

> Are there best practice recommendations for upgrading the version
> of SQLite that comes bundled with versions of Python 2.5 and
> later?

At least on Windows, you only have to replace sqlite3.dll (in the DLLs  
directory) with the new one, and that's all.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb 18 02:01:36 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 05:01:36 -0200
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <878wo4verq.fsf@agentultra.com>
Message-ID: <op.upjcgy1ox6zn5v@gabriel.sleipnir-bsas>

En Tue, 17 Feb 2009 21:12:57 -0200, J Kenneth King <james at agentultra.com>  
escribi?:

> I recently started a project called TracShell
> (http://code.google.com/p/tracshell) where I make heavy use of the
> xmlrpclib core module.
>
> When the number of RPC calls was small, wrapping each call in try/except
> was acceptable. However, this obviously will duplicate code all over the
> place. There are only ever two exceptions that the module itself will
> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
> but not show stoppers.
>
> To combat the duplication, my clever idea was to use a function
> decorator to wrap any function that used xmlrpclib calls:
>
> def catch_errors(fn):
>     """
>     A decorator to catch typical xmlrpclib exceptions
>     """
>     def wrapped(*args, **kwargs):
>         try:
>             return fn(*args, **kwargs)
>         except xmlrpclib.ProtocolError, e:
>             print "There was a problem communicating with the server."
>             print "URL: %s" % e.url
>             print "Headers: %s" % e.headers
>             print "Error code: %d" % e.errcode
>             print "Error message: %s" % e.errmsg
>             print "Please file a report with the TracShell developers."
>             pass
>         except xmlrpclib.Fault, e:
>             print "A fault ocurred"
>             print "Fault code: %d" % e.faultCode
>             print "Fault string: %s" % e.faultString
>             print "If you think this message is the result of an error,"
>             print "please file a report with the TracShell developers."
>             pass
>     return wrapped

I don't like the idea of "hiding" an exception. The caller code doesn't  
know an exception occurred, and just continue doing its work, with bogus  
results... is this what you want? Also, you don't include the stack trace  
- and usually it contains very valuable information. When your users start  
"filing a report with the TracShell developers" and you feel clueless, a  
stack trace is important (you don't have to show it on screen - a log file  
is even better).

If all you want is to customize the error message, use sys.except_hook

Looking into the code, those "pass" statement are useless; and error  
messages are usually written to stderr instead of stdout.

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 02:24:35 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 07:24:35 GMT
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.08.45.35@REMOVE.THIS.cybersource.com.au>
	<2d09213e-8095-43d2-a067-6c2b301fa41a@x9g2000yqk.googlegroups.com>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
	<39uq66-b7j.ln1@lairds.us>
Message-ID: <pan.2009.02.18.07.24.36@REMOVE.THIS.cybersource.com.au>

On Tue, 17 Feb 2009 14:30:27 +0000, Cameron Laird wrote:

> In article <pan.2009.02.10.22.26.39 at REMOVE.THIS.cybersource.com.au>,
> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 			.
> 			.
> 			.
>>> And now for my version (which admitedly isn't really mine, and returns
>>> slightly incorrect fib(n) for large values of n, due to the limited
>>> floating point precision).
>>
>>The floating point version is nice, but it starts giving incorrect
>>answers relatively early, from n=71. But if you don't need accurate
>>results (a relative error of 3e-15 for n=71), it is very fast.
> 			.
> 			.
> 			.
> While my personal opinion is that it's silly to characterize an error of
> 3e-15 as not "accurate", 

That's a *relative* error. The absolute error is 1 for n=71, 59 for n=80, 
1196093 for n=100, and 1875662300654090482610609259 for n=200. As far as 
I can tell, the absolute error grows without bounds as n increases -- and 
it overflows at n=1475.

I agree that a relative error is small, and if your use allows it, then 
by all means use the inexact floating point function. But if you need 
exact results, then you won't get it using floats.



> I think more constructive is to focus on the
> fact that the closed-form solution can be touched up to give a precise
> integral solution, while re- taining its (approximately) O(log n)
> run-time cost.

I doubt that. Since both phi and sqrt(5) are irrational numbers, it would 
require an infinite number of integer digits to get precise integral 
solutions unless there was some sort of freakish cancellation. But you 
probably could get a very good integral solution which gives exact 
results up to whatever limit you wanted, bound only by the amount of 
memory and time you were willing to spend.



-- 
Steven


From mail at microcorp.co.za  Wed Feb 18 02:25:24 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 18 Feb 2009 09:25:24 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
Message-ID: <004901c9919a$284b89c0$0d00a8c0@hendrik>

"gert" <gert.cuykens at gmail.com>wrote:


> After reading the docs and seeing a few examples i think this should
> work ?
> Am I forgetting something here or am I doing something stupid ?
> Anyway I see my yellow screen, that has to count for something :)
> 
> from tkinter import *
> from threading import Thread
> 
> class Weegbrug(Thread):
>     def __init__(self,v):
>         self.v=v
>         Thread.__init__(self)
>     def run(self):
>         while True:
>             with open('com1','r') as f:
>                  for line in f:
>                      self.v.set(line[2:-1])

It is in general not a good idea to directly
access GUI variables from outside the
GUI main loop.
There is a recipe for doing this sort of thing,
but as usual I have lost the reference.
What it does is that instead of interfering directly
as above, you put the data on a queue.

Then, you use the after() call to set up a call
to a routine that reads the queue, and configures the
display, and then uses after again to call itself again
after a time, thereby keeping the GUI stuff in the GUI 
mainloop.

HTH - Hendrik





From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 02:55:41 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 07:55:41 GMT
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
Message-ID: <pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 07:08:04 +1100, Jervis Whitley wrote:


>> This moves the for-loop out of slow Python into fast C and should be
>> much, much faster for very large input.
>>
>>
> _Should_ be faster.

Yes, Python's timing results are often unintuitive.


> Here is my test on an XP system Python 2.5.4. I had similar results on
> python 2.7 trunk.
...
> **no vowels**
> any: [0.36063678618957751, 0.36116506191682773, 0.36212355395824081]
> for: [0.24044885376801672, 0.2417684017413404, 0.24084797257163482]

I get similar results.

...
> **BIG word vowel 'U' final char**
> any: [8.0007259193539895, 7.9797344140269644, 7.8901742633514012] for:
> [7.6664422372764101, 7.6784683633957584, 7.6683055766498001]

Well, I did say "for very large input". 10000 chars isn't "very large" -- 
that's only 9K. Try this instead:

>>> BIGWORD = 'g' * 500000 + 'U'  # less than 500K of text
>>>
>>> Timer("for_test(BIGWORD)", setup).repeat(number=1000)
[4.7292280197143555, 4.633030891418457, 4.6327309608459473]
>>> Timer("any_test(BIGWORD)", setup).repeat(number=1000)
[4.7717428207397461, 4.6366970539093018, 4.6367099285125732]

The difference is not significant. What about bigger?


>>> BIGWORD = 'g' * 5000000 + 'U'  # less than 5MB 
>>>
>>> Timer("for_test(BIGWORD)", setup).repeat(number=100)
[4.8875839710235596, 4.7698030471801758, 4.769787073135376]
>>> Timer("any_test(BIGWORD)", setup).repeat(number=100)
[4.8555209636688232, 4.8139419555664062, 4.7710208892822266]

It seems to me that I was mistaken -- for large enough input, the running 
time of each version converges to approximately the same speed.

What happens when you have hundreds of megabytes, I don't know.


-- 
Steven


From timr at probo.com  Wed Feb 18 03:15:00 2009
From: timr at probo.com (Tim Roberts)
Date: Wed, 18 Feb 2009 00:15:00 -0800
Subject: Found a very nice, small, cross-platform GUI toolkit for Python.
References: <4a912328-2d60-4380-b440-8d4d94f79662@v19g2000yqn.googlegroups.com>
	<mailman.27.1234769699.11746.python-list@python.org>
	<66885dbe-72cd-46da-b59e-90e7f2dcf7da@m42g2000yqb.googlegroups.com>
Message-ID: <qignp4pa2mbcbcaq413p0ims2j7tp287nb@4ax.com>

laplacian42 at gmail.com wrote:
>
>> For applications installing the full wxWidgets or Qt toolkits would be
>> less disk space and dependcies than OceanGUI
>
>What? Qt and wX are *huge* compared to OcempGUI.

Well, not compared to OcempGUI + SDL + PyGame.  Note that I'm not trying to
run down the product at all, but if you're going to make comparisons like
this, you really need to be fair about it.

>> and performance would probably be higher.
>
>Probably, but wX and Qt are written in C++. OcempGUI is pure Python,
>which would make it easier for the Python community to help extend,
>optimize, and maintain.

Again, that's hardly fair.  OcempGUI is only pure Python because it
requires the C libraries SDL and PyGame.  wxPython is basically pure
Python, also, if you don't count the C++ wxWidgets library underneath it.

As you say, if you are already using SDL and PyGame, this sounds like a
great solution.  But for someone starting from scratch, it's not yet clear
to me that OcempGUI substantially better than wx.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From tim--at-- at frontier--dot--.net  Wed Feb 18 03:17:40 2009
From: tim--at-- at frontier--dot--.net (Tim H)
Date: Wed, 18 Feb 2009 01:17:40 -0700
Subject: urllib confusion
Message-ID: <qrmdnUaVbbGuWQbUnZ2dnUVZ_hGdnZ2d@brainstorminternet.net>

When I attempt to open 2 different pages on the same site I get 2 copies 
of the first page. ??

ie

links = [ 'http://site.org/foo/1/bar',
           'http://site.org/foo/2/bar' ]

for url in links:
	print "url:", url
	f = urlopen(url, params)
	print "Actual url:", f.geturl()
	print f.read()
	f.close()


results in:

url: http://site.org/foo/1/bar
Actual url: http://site.org/foo/1/bar
page 1 contents
url: http://site.org/foo/2/bar
Actual url: http://site.org/foo/1/bar
page 1 contents

f.getinfo() shows two different session ID's

Any thoughts?

Thanks,
Tim
	
WinXP-x64
python 2.6.1 x64


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 03:33:08 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Feb 2009 08:33:08 GMT
Subject: urllib confusion
References: <qrmdnUaVbbGuWQbUnZ2dnUVZ_hGdnZ2d@brainstorminternet.net>
Message-ID: <pan.2009.02.18.08.33.08@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 01:17:40 -0700, Tim H wrote:

> When I attempt to open 2 different pages on the same site I get 2 copies
> of the first page. ??
...
> Any thoughts?

What does your browser do?

What does your browser do if you turn off cookies, re-directions and/or 
referers?



-- 
Steven


From pavlovevidence at gmail.com  Wed Feb 18 03:56:10 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 00:56:10 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com>

On Feb 17, 3:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> Hello all,
>
> On a previous thread (http://groups.google.com/group/comp.lang.python/
> browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> binary data. Briefly, my data consists of complex numbers, 32-bit
> floats for real and imaginary parts. The data is stored as 4 bytes
> Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> row-major format. I needed to read the data in as two separate numpy
> arrays, one for real values and one for imaginary values.
>
> There were several very helpful performance tips offered, and one in
> particular I've started looking into. The author suggested a
> "numpy.memmap" object may be beneficial. It was suggested I use it as
> follows:
>
> descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> print "First 100 real values:", data.r[:100]
>
> I have two questions:
> 1) What is "recarray"?

Let's look:

[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> numpy.recarray
<class 'numpy.core.records.recarray'>
>>> help(numpy.recarray)

Help on class recarray in module numpy.core.records:

class recarray(numpy.ndarray)
 |  recarray(shape, dtype=None, buf=None, **kwds)
 |
 |  Subclass of ndarray that allows field access using attribute
lookup.
 |
 |  Parameters
 |  ----------
 |  shape : tuple
 |      shape of record array
 |  dtype : data-type or None
 |      The desired data-type.  If this is None, then the data-type is
determine
 |      by the *formats*, *names*, *titles*, *aligned*, and
*byteorder* keywords
 |  buf : [buffer] or None
 |      If this is None, then a new array is created of the given
shape and data
 |      If this is an object exposing the buffer interface, then the
array will
 |      use the memory from an existing buffer.  In this case, the
*offset* and
 |      *strides* keywords can also be used.
...


So there you have it.  It's a subclass of ndarray that allows field
access using attribute lookup.  (IOW, you're creating a view of the
memmap'ed data of type recarray, which is the type numpy uses to
access structures by name.  You need to create the view because
regular numpy arrays, which numpy.memmap creates, can't access fields
by attribute.)

help() is a nice thing to use, and numpy is one of the better
libraries when it comes to docstrings, so learn to use it.


> 2) The documentation for numpy.memmap claims that it is meant to be
> used in situations where it is beneficial to load only segments of a
> file into memory, not the whole thing. This is definately something
> I'd like to be able to do as my files are frequently >1Gb. I don't
> really see in the diocumentation how portions are loaded, however.
> They seem to create small arrays and then assign the entire array
> (i.e. file) to the memmap object. Let's assume I have a binary data
> file of complex numbers in the format described above, and let's
> assume that the size of the complex data array (that is, the entire
> file) is 100x100 (rows x columns). Could someone please post a few
> lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> right 50 x 50 quadrant into memmap objects? Thank you very much in
> advance!


You would memmap the whole region in question (in this case the whole
file), then take a slice.  Actually you could get away with memmapping
just the last 50 rows (bottom half).  The offset into the file would
be 50*100*8, so:

data = memmap(filename, dtype=descriptor, mode='r',offset=
(50*100*8)).view(recarray)
reshaped_data = reshape(data,(50,100))
intersting_data = reshaped_data[:,50:100]


A word of caution: Every instance of numpy.memmap creates its own mmap
of the whole file (even if it only creates an array from part of the
file).  The implications of this are A) you can't use numpy.memmap's
offset parameter to get around file size limitations, and B) you
shouldn't create many numpy.memmaps of the same file.  To work around
B, you should create a single memmap, and dole out views and slices.


Carl Banks


From justinli79 at gmail.com  Wed Feb 18 03:59:20 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 00:59:20 -0800 (PST)
Subject: Building python with sqlite3
Message-ID: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>


I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
make, make install, to import sqlite3 leads to ImportError. It looks
like I have to build Python with sqlite. I have sqlite3 installed on
my system. How should I build Python with it? I did not find any
options relating with sqlite3 of configure and Makefile.

Thanks in Advance!
Justin


From mzagursk at gmail.com  Wed Feb 18 04:00:28 2009
From: mzagursk at gmail.com (mzagursk at gmail.com)
Date: Wed, 18 Feb 2009 01:00:28 -0800 (PST)
Subject: Calling a script requiring user input from another script
Message-ID: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>

I'm kind of new to this so bear with me.

I have a script made that requires user input (lets call it script A)
while it's running.  However, I would like to create another script
(script B) that can batch process (i.e. run script A over and over
with different user inputs based on script B).  Is this possible?  and
how so?  Thanks in advance.


From rt8396 at gmail.com  Wed Feb 18 04:02:22 2009
From: rt8396 at gmail.com (r)
Date: Wed, 18 Feb 2009 01:02:22 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
Message-ID: <9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>

Hello Josh,
Blender is a lost cause. It is a powerful app but the UI is horrible.
Even the Blender folks admit only a complete rewrite could solve the
major flaws that plague the design. So maybe i could salvage some code
but for what i have in mind, Blender will look like a piece of
software from the middle ages. And i am absolutly only looking to do
this in 3D, 2D is boring.

So, yes, i have looked at both the applications you offer.

Thanks


From rt8396 at gmail.com  Wed Feb 18 04:10:31 2009
From: rt8396 at gmail.com (r)
Date: Wed, 18 Feb 2009 01:10:31 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<mailman.168.1234919426.11746.python-list@python.org>
Message-ID: <845c0b97-8644-448a-b5f7-06da727cf466@n10g2000vbl.googlegroups.com>

Yes i want linux, windows, and mac support. I think you are good for a
few years though :). Getting something up and working is the easy
part. Adding all the features that are required to compete with
something the likes of SolidWorks or ACAD  takes time.

One way or another i am going to build this, whether or not it takes
off and gets to a professional level -- only time will tell. I know
one thing for sure the need is there, the product is not.


From catphive at catphive.net  Wed Feb 18 04:11:09 2009
From: catphive at catphive.net (Brendan Miller)
Date: Wed, 18 Feb 2009 01:11:09 -0800
Subject: PyYaml in standard library?
Message-ID: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>

I'm just curious whether PyYaml is likely to end up in the standard
library at some point?


From lists at cheimes.de  Wed Feb 18 04:13:29 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 18 Feb 2009 10:13:29 +0100
Subject: Building python with sqlite3
In-Reply-To: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
Message-ID: <gngjfp$75i$1@ger.gmane.org>

Justin Li schrieb:
> I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> make, make install, to import sqlite3 leads to ImportError. It looks
> like I have to build Python with sqlite. I have sqlite3 installed on
> my system. How should I build Python with it? I did not find any
> options relating with sqlite3 of configure and Makefile.

Do you have the development files installed as well? Run "make" again
and look at the list of missing modules.

Christian



From clp2 at rebertia.com  Wed Feb 18 04:18:33 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 01:18:33 -0800
Subject: Calling a script requiring user input from another script
In-Reply-To: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>
References: <116dbdad-8d26-4597-aff4-73a0075890c3@v38g2000yqb.googlegroups.com>
Message-ID: <50697b2c0902180118qf4e02erb10fba5d4d3f0e46@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:00 AM, mzagursk at gmail.com <mzagursk at gmail.com> wrote:
> I'm kind of new to this so bear with me.
>
> I have a script made that requires user input (lets call it script A)
> while it's running.  However, I would like to create another script
> (script B) that can batch process (i.e. run script A over and over
> with different user inputs based on script B).  Is this possible?  and
> how so?  Thanks in advance.

Define a function in A that lets its functionality be used
programmatically. Then use the `if __name__ == "__main__"` trick to
have A take input from the user and call the function you just defined
 with the user input if it's run as a script.

In B, import A's function and call it repeatedly on the inputs.

Example (assume addition is A's fancy functionality):

#A.py BEFORE:
while True:
    input_ = raw_input()
    if input_ == "exit":
        break
    x = int(input_)
    y = int(raw_input())
    print x + y

#A.py AFTER:
#functionality refactored into a function
def add(x, y):
    return x + y

if __name__ == "__main__":
    while True:
        if input_ == "exit":
            break
        x = int(input_)
        y = int(raw_input())
        print add(x, y)#use the function

#B.py
from A import add

for i,j in some_input_pairs:
    add(i, j)#use the function


Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tomanishkb at gmail.com  Wed Feb 18 04:31:13 2009
From: tomanishkb at gmail.com (M Kumar)
Date: Wed, 18 Feb 2009 15:01:13 +0530
Subject: Python-list Digest, Vol 65, Issue 365
In-Reply-To: <mailman.747.1234948421.11745.python-list@python.org>
References: <mailman.747.1234948421.11745.python-list@python.org>
Message-ID: <783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>

I think the given statement below will give you what you r looking
<imported module name>.__file__print

On Wed, Feb 18, 2009 at 2:43 PM, <python-list-request at python.org> wrote:

> Send Python-list mailing list submissions to
>        python-list at python.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>        http://mail.python.org/mailman/listinfo/python-list
> or, via email, send a message with subject or body 'help' to
>        python-list-request at python.org
>
> You can reach the person managing the list at
>        python-list-owner at python.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Python-list digest..."
>
> Today's Topics:
>
>   1. Directory (gtillmon)
>   2. Re: Is there something easier than ORM? (Michele Simionato)
>   3. Re: flexible find and replace ? (OdarR)
>   4. Re: urllib confusion (Steven D'Aprano)
>   5. Re: numpy.memmap advice? (Carl Banks)
>   6. Building python with sqlite3 (Justin Li)
>   7. Calling a script requiring user input from another script
>      (mzagursk at gmail.com)
>   8. Re: Python 3D CAD -- need collaborators, or just brave souls
>      :) (r)
>   9. PyYaml in standard library? (Brendan Miller)
>  10. Re: Building python with sqlite3 (Christian Heimes)
>
>
> ---------- Forwarded message ----------
> From: gtillmon <gtill60 at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 17:18:11 -0800 (PST)
> Subject: Directory
> Hello.  I am new to the Python language.
> I would like to know how to display and store the path of each mondule
> that is called.
> Similar to the old READY TRACE in COBOL of long ago.
>
> Thanks,
> George
>
>
>
> ---------- Forwarded message ----------
> From: Michele Simionato <michele.simionato at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 08:46:02 -0800 (PST)
> Subject: Re: Is there something easier than ORM?
> On Feb 17, 5:35 pm, Philip Semanchuk <phi... at semanchuk.com> wrote:
> >
> > I don't intend this as a criticism of SqlAlchemy. On the contrary I am
> > impressed by what it does. But I often see people promoting ORM as the
> > solution to all database access problems, and I certainly don't feel
> > like it is.
>
> I am also not a big fan of ORM, especially in situations where you
> have
> performance issues and you are using database specific features. In
> such situations
> you don't care about portability, but you care about having your SQL
> explicit,
> so that you can run it directly under the profiler.
>
>
>
> ---------- Forwarded message ----------
> From: OdarR <Olivier.Darge at gmail.com>
> To:
> Date: Tue, 17 Feb 2009 11:29:19 -0800 (PST)
> Subject: Re: flexible find and replace ?
> Thanks to everybody.
> I need to test your propositions now :)
>
> Olivier
>
>
>
> ---------- Forwarded message ----------
> From: Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
> To: python-list at python.org
> Date: 18 Feb 2009 08:33:08 GMT
> Subject: Re: urllib confusion
> On Wed, 18 Feb 2009 01:17:40 -0700, Tim H wrote:
>
> > When I attempt to open 2 different pages on the same site I get 2 copies
> > of the first page. ??
> ...
> > Any thoughts?
>
> What does your browser do?
>
> What does your browser do if you turn off cookies, re-directions and/or
> referers?
>
>
>
> --
> Steven
>
>
>
> ---------- Forwarded message ----------
> From: Carl Banks <pavlovevidence at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 00:56:10 -0800 (PST)
> Subject: Re: numpy.memmap advice?
> On Feb 17, 3:08 pm, Lionel <lionel.ke... at gmail.com> wrote:
> > Hello all,
> >
> > On a previous thread (http://groups.google.com/group/comp.lang.python/
> > browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> > hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> > binary data. Briefly, my data consists of complex numbers, 32-bit
> > floats for real and imaginary parts. The data is stored as 4 bytes
> > Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> > row-major format. I needed to read the data in as two separate numpy
> > arrays, one for real values and one for imaginary values.
> >
> > There were several very helpful performance tips offered, and one in
> > particular I've started looking into. The author suggested a
> > "numpy.memmap" object may be beneficial. It was suggested I use it as
> > follows:
> >
> > descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> > data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> > print "First 100 real values:", data.r[:100]
> >
> > I have two questions:
> > 1) What is "recarray"?
>
> Let's look:
>
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import numpy
> >>> numpy.recarray
> <class 'numpy.core.records.recarray'>
> >>> help(numpy.recarray)
>
> Help on class recarray in module numpy.core.records:
>
> class recarray(numpy.ndarray)
>  |  recarray(shape, dtype=None, buf=None, **kwds)
>  |
>  |  Subclass of ndarray that allows field access using attribute
> lookup.
>  |
>  |  Parameters
>  |  ----------
>  |  shape : tuple
>  |      shape of record array
>  |  dtype : data-type or None
>  |      The desired data-type.  If this is None, then the data-type is
> determine
>  |      by the *formats*, *names*, *titles*, *aligned*, and
> *byteorder* keywords
>  |  buf : [buffer] or None
>  |      If this is None, then a new array is created of the given
> shape and data
>  |      If this is an object exposing the buffer interface, then the
> array will
>  |      use the memory from an existing buffer.  In this case, the
> *offset* and
>  |      *strides* keywords can also be used.
> ...
>
>
> So there you have it.  It's a subclass of ndarray that allows field
> access using attribute lookup.  (IOW, you're creating a view of the
> memmap'ed data of type recarray, which is the type numpy uses to
> access structures by name.  You need to create the view because
> regular numpy arrays, which numpy.memmap creates, can't access fields
> by attribute.)
>
> help() is a nice thing to use, and numpy is one of the better
> libraries when it comes to docstrings, so learn to use it.
>
>
> > 2) The documentation for numpy.memmap claims that it is meant to be
> > used in situations where it is beneficial to load only segments of a
> > file into memory, not the whole thing. This is definately something
> > I'd like to be able to do as my files are frequently >1Gb. I don't
> > really see in the diocumentation how portions are loaded, however.
> > They seem to create small arrays and then assign the entire array
> > (i.e. file) to the memmap object. Let's assume I have a binary data
> > file of complex numbers in the format described above, and let's
> > assume that the size of the complex data array (that is, the entire
> > file) is 100x100 (rows x columns). Could someone please post a few
> > lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> > right 50 x 50 quadrant into memmap objects? Thank you very much in
> > advance!
>
>
> You would memmap the whole region in question (in this case the whole
> file), then take a slice.  Actually you could get away with memmapping
> just the last 50 rows (bottom half).  The offset into the file would
> be 50*100*8, so:
>
> data = memmap(filename, dtype=descriptor, mode='r',offset=
> (50*100*8)).view(recarray)
> reshaped_data = reshape(data,(50,100))
> intersting_data = reshaped_data[:,50:100]
>
>
> A word of caution: Every instance of numpy.memmap creates its own mmap
> of the whole file (even if it only creates an array from part of the
> file).  The implications of this are A) you can't use numpy.memmap's
> offset parameter to get around file size limitations, and B) you
> shouldn't create many numpy.memmaps of the same file.  To work around
> B, you should create a single memmap, and dole out views and slices.
>
>
> Carl Banks
>
>
>
> ---------- Forwarded message ----------
> From: Justin Li <justinli79 at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 00:59:20 -0800 (PST)
> Subject: Building python with sqlite3
>
> I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> make, make install, to import sqlite3 leads to ImportError. It looks
> like I have to build Python with sqlite. I have sqlite3 installed on
> my system. How should I build Python with it? I did not find any
> options relating with sqlite3 of configure and Makefile.
>
> Thanks in Advance!
> Justin
>
>
>
> ---------- Forwarded message ----------
> From: "mzagursk at gmail.com" <mzagursk at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:00:28 -0800 (PST)
> Subject: Calling a script requiring user input from another script
> I'm kind of new to this so bear with me.
>
> I have a script made that requires user input (lets call it script A)
> while it's running.  However, I would like to create another script
> (script B) that can batch process (i.e. run script A over and over
> with different user inputs based on script B).  Is this possible?  and
> how so?  Thanks in advance.
>
>
>
> ---------- Forwarded message ----------
> From: r <rt8396 at gmail.com>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:02:22 -0800 (PST)
> Subject: Re: Python 3D CAD -- need collaborators, or just brave souls :)
> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.
>
> So, yes, i have looked at both the applications you offer.
>
> Thanks
>
>
>
> ---------- Forwarded message ----------
> From: Brendan Miller <catphive at catphive.net>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 01:11:09 -0800
> Subject: PyYaml in standard library?
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?
>
>
>
> ---------- Forwarded message ----------
> From: Christian Heimes <lists at cheimes.de>
> To: python-list at python.org
> Date: Wed, 18 Feb 2009 10:13:29 +0100
> Subject: Re: Building python with sqlite3
> Justin Li schrieb:
> > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > make, make install, to import sqlite3 leads to ImportError. It looks
> > like I have to build Python with sqlite. I have sqlite3 installed on
> > my system. How should I build Python with it? I did not find any
> > options relating with sqlite3 of configure and Makefile.
>
> Do you have the development files installed as well? Run "make" again
> and look at the list of missing modules.
>
> Christian
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Regards,

Maneesh KB

Comat Technologies

Bangalore

Mob: 9740-192309



We work with the underprivileged and in rural India. If you are interested
to be a part of it, please mail or call me. I will be happy to share and
inform - http://www.comat.com
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From rdmurray at bitdance.com  Wed Feb 18 04:34:07 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 18 Feb 2009 09:34:07 +0000 (UTC)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
Message-ID: <gngkme$bde$1@ger.gmane.org>

alex23 <wuwei23 at gmail.com> wrote:
> On Feb 18, 11:36=A0am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> > Thomas Allen <thomasmal... at gmail.com> writes:
> > > attempting. Basically, I'm transforming a live site to a local one and
> >
> > Something wrong with wget -R ?
> 
> Did you mean wget -r ?
> 
> That will just grab the entire site, though. I'm guessing that Thomas'
> function absToRel will eventually replace the print with something
> that changes links accordingly so the local version is traversable.

Yeah, but wget -r -k will do that bit of it, too.

--RDM



From clp2 at rebertia.com  Wed Feb 18 04:34:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 01:34:08 -0800
Subject: PyYaml in standard library?
In-Reply-To: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
Message-ID: <50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:11 AM, Brendan Miller <catphive at catphive.net> wrote:
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?

I don't personally have a direct answer to your question, but I can
point out that JSON and YAML are mostly compatible (JSON is almost a
perfect YAML subset) and the `json` module is already in the Python
std lib.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From wuwei23 at gmail.com  Wed Feb 18 04:51:34 2009
From: wuwei23 at gmail.com (alex23)
Date: Wed, 18 Feb 2009 01:51:34 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
Message-ID: <c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>

On Feb 18, 7:34?pm, rdmur... at bitdance.com wrote:
> Yeah, but wget -r -k will do that bit of it, too.

Wow, nice, I don't know why I never noticed that. Cheers!



From mal at egenix.com  Wed Feb 18 06:36:45 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 18 Feb 2009 12:36:45 +0100
Subject: Is there something easier than ORM?
In-Reply-To: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
Message-ID: <499BF2CD.5060807@egenix.com>

On 2009-02-17 13:27, ??? wrote:
> Hi all,
> 
> Recently I am studying some python ORM libraries, such as sqlalchemy.
> 
> These are very powerful technologies to handle database.  But I think
> my project are not complicated to enough to benefit from a complete
> ORM system.
> 
> What I really want, is some easy ways to load data from database, and
> change rows of data to list of named tuple, then I could send these
> data to my client application.
> 
> I don't think I want these subtle behavior such as lazy load, auto
> update, ect. in ORM.
> 
> So is there some libraries like that?

Python has a DB-API standard for direct access to databases using
a very simple cursor-based approach:

    http://www.python.org/dev/peps/pep-0249/

All the DB-API compatible modules provide such an interface:

    http://wiki.python.org/moin/DatabaseInterfaces

> Or is there some tools that could generate code from database scheme
> as I want?

I am not aware of an automated tool for generating SQL queries
in form of Python functions, but it is certainly possible to write
one by tapping into the system tables of the database of your
choice.

Our database tools mxODBC and mxODBC Connect come with a set of
catalog methods that make such introspection very easy across
databases and platforms:

    http://www.egenix.com/products/python/mxODBC/
    http://www.egenix.com/products/python/mxODBCConnect/

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 18 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From pofuk at email.t-com.hr  Wed Feb 18 07:09:24 2009
From: pofuk at email.t-com.hr (SMALLp)
Date: Wed, 18 Feb 2009 13:09:24 +0100
Subject: os.popen encoding!
Message-ID: <gngtpj$1fi$1@ss408.t-com.hr>

Hy.
I'm playing with os.popen function.
a = os.popen("somecmd").read()

If one of the lines contains characters like "?", "?"or any other it loks 
line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:

for i in a:
    print i:

How to solve this and where exectly is problem with print or read! Windows 
XP, Python 2.5.4

Thanks! 




From tim.wintle at teamrubber.com  Wed Feb 18 07:19:04 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 12:19:04 +0000
Subject: memory recycling/garbage collecting problem
In-Reply-To: <gnen5t$fjm$1@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<b4180ecb-0007-487a-8dce-24bcc729c685@l38g2000vba.googlegroups.com>
	<50697b2c0902170040k2b2c211ew2a2ce3e4c5044c17@mail.gmail.com>
	<1234879826.7672.11.camel@tim-laptop>  <gnen5t$fjm$1@ger.gmane.org>
Message-ID: <1234959544.30417.8.camel@tim-laptop>

On Tue, 2009-02-17 at 17:04 +0100, Christian Heimes wrote:
> Tim Wintle wrote:
> > Basically malloc() and free() are computationally expensive, so Python
> > tries to call them as little as possible - but it's quite clever at
> > knowing what to do - e.g. if a list has already grown large then python
> > assumes it might grow large again and keeps hold of a percentage of the
> > memory.
> 
> You are almost right. Python's mutable container types like have a
> non-linear growth rate.
> 
> >From the file listobject.c
> 
> /*
> This over-allocates proportional to the list size, making room
> for additional growth.  The over-allocation is mild, but is
> enough to give linear-time amortized behavior over a long
> sequence of appends() in the presence of a poorly-performing
> system realloc().
> The growth pattern is:  0, 4, 8, 16, 25, 35, 46, 58, 72, 88, ...
> */
> 
> new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);

Sorry, I think I didn't phrase myself very well - I was trying to
explain that de-allocation of memory follows different scaling behaviour
to allocation - so a large list that's shrunk is likely to take more
memory than a small list that's grown i.e. the part just above your
quote:


/* 
Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize.  If the newsize falls lower than half
the allocated size, then proceed with the realloc() to shrink the list.
*/
if (allocated >= newsize && newsize >= (allocated >> 1)) {
	assert(self->ob_item != NULL || newsize == 0);
	Py_SIZE(self) = newsize;
	return 0;
}


it's all very clever stuff btw.




From dfnsonfsduifb at gmx.de  Wed Feb 18 07:36:17 2009
From: dfnsonfsduifb at gmx.de (Johannes Bauer)
Date: Wed, 18 Feb 2009 13:36:17 +0100
Subject: Searching Google?
In-Reply-To: <mailman.166.1234917814.11746.python-list@python.org>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
Message-ID: <702dm1FkrikgU1@mid.dfncis.de>

Curt Hash schrieb:

> You just need to change your User-Agent so that Google doesn't know a
> Python script is making the request:

Why would Google not send a response if the User-Agent header field is
not a recognized browser? I doubt that's what's happening and the OP
would just like the convenience of a search API instead of parsing the
web page (like other applications do). Ugly, but it works.

Regards,
Johannes

-- 
"Meine Gegenklage gegen dich lautet dann auf bewusste Verlogenheit,
verl?sterung von Gott, Bibel und mir und bewusster Blasphemie."
         -- Prophet und Vision?r Hans Joss aka HJP in de.sci.physik
                         <48d8bf1d$0$7510$5402220f at news.sunrise.ch>


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 07:38:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 10:38:54 -0200
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
Message-ID: <op.upjr24vfx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 10:09:24 -0200, SMALLp <pofuk at email.t-com.hr> escribi?:

> Hy.
> I'm playing with os.popen function.
> a = os.popen("somecmd").read()
>
> If one of the lines contains characters like "?", "?"or any other it loks
> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>
> for i in a:
>     print i:
>

'\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E WITH  
GRAVE' Unicode code point u'?' encoded in the Windows-1252 encoding (and  
latin-1, and others too). This is the usual Windows encoding (in "Western  
Europe" but seems to cover a much larger part of the world... most of  
America, if not all).

When you *look* at some string in the interpreter, you see its repr()  
(note the surrounding quotes). When you *print* some string, you get its  
contents:

py> s = "ma m?re"
py> s
'ma m\x8are'
py> print s
ma m?re
py> print repr(s)
'ma m\x8are'

> How to solve this and where exectly is problem with print or read!  
> Windows
> XP, Python 2.5.4

There is *no* problem. You should read the Unicode howto:  
<http://docs.python.org/howto/unicode.html>
If you still think there is a problem, please provide more details.

-- 
Gabriel Genellina



From mad.vijay at gmail.com  Wed Feb 18 08:23:26 2009
From: mad.vijay at gmail.com (SamG)
Date: Wed, 18 Feb 2009 05:23:26 -0800 (PST)
Subject: Crypto headaches.
Message-ID: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>

Hi,

Using the python's Crypto.Cipher.Blowfish is create and encrypted file
in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
error stating "bad magic number".

I tried
$ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
or
$ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file

BTW, decryption using a python code works well. But i m of the
impression a file encry with one program should/can be decrypt with
another program (in my case openssl) using the same parameters.

Pls help.

SamG


From gabriel.rossetti at arimaz.com  Wed Feb 18 08:43:51 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Wed, 18 Feb 2009 14:43:51 +0100
Subject: Python/environment problem with char encoding/decoding
Message-ID: <499C1097.5000505@arimaz.com>

Hello everyone,

I originally posted this on the Twisted mailing list, but now it seams 
to be  a more general python/environment problem. If I run the attached 
example in Eclipse, it works, if I run it from a terminal, it doesn't, I 
get :

$ python xml_parser_test.py
Traceback (most recent call last):
  File "xml_parser_test.py", line 30, in <module>
    res = rawXmlToElement("<t>re?u</t>")
  File "xml_parser_test.py", line 21, in __call__
    tmp.addRawXml(s)
  File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py", 
line 538, in addRawXml
    self.children.append(SerializedXML(rawxmlstring))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5: 
ordinal not in range(128)

Does anyone understand why it doesn't work outside of Eclipse? My OS is 
Linux (Ubuntu 8.04).

Thank you,
Gabriel
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From hniksic at xemacs.org  Wed Feb 18 09:00:17 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Wed, 18 Feb 2009 15:00:17 +0100
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
Message-ID: <87ocwzzvym.fsf@mulj.homelinux.net>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

>> I'm playing with os.popen function.
>> a = os.popen("somecmd").read()
>>
>> If one of the lines contains characters like "?", "?"or any other it loks
>> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>>
>> for i in a:
>>     print i:
>
> '\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E
> WITH  GRAVE' Unicode code point u'?' encoded in the Windows-1252
> encoding (and  latin-1, and others too).

Note that it is also 'LATIN SMALL LETTER C WITH CARON' (U+010D or
u'?'), encoded in Windows-1250, which is what the OP is likely using.

The rest of your message stands regardless: there is no problem, at
least as long as the OP only prints out the character received from
somecmd to something else that also expects Windows-1250.  The problem
would arise if the OP wanted to store the string in a PyGTK label
(which expects UTF8) or send it to a web browser (which expects
explicit encoding, probably defaulting to UTF8), in which case he'd
have to disambiguate whether '\xe8' refers to U+010D or to U+00E8 or
something else entirely.

That is the problem that Python 3 solves by requiring (or strongly
suggesting) that such disambiguation be performed as early in the
program as possible, preferrably while the characters are being read
from the outside source.  A similar approach is possible using Python
2 and its unicode type, but since the OP never specified exactly which
problem he had (except for the repr/str confusion), it's hard to tell
if using the unicode type would help.


From mal at egenix.com  Wed Feb 18 09:10:42 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Wed, 18 Feb 2009 15:10:42 +0100
Subject: Crypto headaches.
In-Reply-To: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
References: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
Message-ID: <499C16E2.7060102@egenix.com>

On 2009-02-18 14:23, SamG wrote:
> Hi,
> 
> Using the python's Crypto.Cipher.Blowfish is create and encrypted file
> in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
> error stating "bad magic number".

Are you getting the error message from openssl ? It looks a lot
like an error message from Python.

> I tried
> $ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
> or
> $ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file
> 
> BTW, decryption using a python code works well. But i m of the
> impression a file encry with one program should/can be decrypt with
> another program (in my case openssl) using the same parameters.

Ideally, that should work, but you also have to make sure that
the following two details are the same for both applications:

 1. the way padding is done (Blowfish is a block cipher)

 2. the way the initialization vector is set

Otherwise the two won't interoperate properly.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 18 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From __peter__ at web.de  Wed Feb 18 09:12:02 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 15:12:02 +0100
Subject: Python/environment problem with char encoding/decoding
References: <mailman.190.1234965056.11746.python-list@python.org>
Message-ID: <gnh4vf$rp0$02$1@news.t-online.com>

Gabriel Rossetti wrote:

> Hello everyone,
> 
> I originally posted this on the Twisted mailing list, but now it seams
> to be  a more general python/environment problem. If I run the attached
> example in Eclipse, it works, if I run it from a terminal, it doesn't, I
> get :
> 
> $ python xml_parser_test.py
> Traceback (most recent call last):
>   File "xml_parser_test.py", line 30, in <module>
>     res = rawXmlToElement("<t>re?u</t>")
>   File "xml_parser_test.py", line 21, in __call__
>     tmp.addRawXml(s)
>   File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py",
> line 538, in addRawXml
>     self.children.append(SerializedXML(rawxmlstring))
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
> ordinal not in range(128)
> 
> Does anyone understand why it doesn't work outside of Eclipse? My OS is
> Linux (Ubuntu 8.04).

On the contrary, I don't understand why it would work in Eclipse ;)

addRawXml(s) seems to be a fancy way to create a unicode string, and
unicode(s) will work either if s is a bytestring that doesn't contain any
non-ascii characters or if s is a unicode string (at least these are the
relevant cases here).

Try changing your program to use a unicode literal:

# -*- coding: utf-8 -*-
...
if ...
    res = rawXmlToElement(u"<t>re?u</t>")

Peter


From benjamin.kaplan at case.edu  Wed Feb 18 09:14:39 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 18 Feb 2009 09:14:39 -0500
Subject: Python/environment problem with char encoding/decoding
In-Reply-To: <499C1097.5000505@arimaz.com>
References: <499C1097.5000505@arimaz.com>
Message-ID: <ec96e1390902180614u224f0c0bmc8450cfee79de910@mail.gmail.com>

On Wed, Feb 18, 2009 at 8:43 AM, Gabriel Rossetti <
gabriel.rossetti at arimaz.com> wrote:

> Hello everyone,
>
> I originally posted this on the Twisted mailing list, but now it seams to
> be  a more general python/environment problem. If I run the attached example
> in Eclipse, it works, if I run it from a terminal, it doesn't, I get :
>
> $ python xml_parser_test.py
> Traceback (most recent call last):
>  File "xml_parser_test.py", line 30, in <module>
>   res = rawXmlToElement("<t>re?u</t>")
>  File "xml_parser_test.py", line 21, in __call__
>   tmp.addRawXml(s)
>  File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py", line
> 538, in addRawXml
>   self.children.append(SerializedXML(rawxmlstring))
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
> ordinal not in range(128)
>
> Does anyone understand why it doesn't work outside of Eclipse? My OS is
> Linux (Ubuntu 8.04).
>
> Thank you,
> Gabriel
>


It's an encoding problem. My guess is that, in eclipse, the default encoding
is UTF-8 or some other unicode-based encoding. In the console, it seems the
encoding defaults to ascii. When twisted attempts to turn your byte string
into a Unicode string, it sees a character that isn't in the encoding and
choke up. Try using a unicode string instead of a byte string.


>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From steve at holdenweb.com  Wed Feb 18 09:15:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 09:15:25 -0500
Subject: Directory
In-Reply-To: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
Message-ID: <gnh565$5fd$1@ger.gmane.org>

gtillmon wrote:
> Hello.  I am new to the Python language.
> I would like to know how to display and store the path of each mondule
> that is called.

Modules are imported, not called.

> Similar to the old READY TRACE in COBOL of long ago.
> 
It's certainly possible to trace function calls, if that would help.
sys.settrace allows you to establish a function that gets called
whenever a Python function call is executed. The documentation is a
little sparse, but you can find a rough example under "Crude Python
Debugging" in

  http://www.st.ewi.tudelft.nl/~mol/snippets.php

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mike.barry at gmail.com  Wed Feb 18 09:23:43 2009
From: mike.barry at gmail.com (mbarry)
Date: Wed, 18 Feb 2009 06:23:43 -0800 (PST)
Subject: _socket.so source?
References: <7b5bcc07-7bfa-4537-b6e4-912e885cdda4@v15g2000yqn.googlegroups.com>
	<mailman.162.1234914454.11746.python-list@python.org>
Message-ID: <3060eb09-a255-419a-a1f1-5a42ffd803ec@h5g2000yqh.googlegroups.com>

On Feb 17, 6:47?pm, Christian Heimes <li... at cheimes.de> wrote:
> mbarry schrieb:
>
> > Hello,
>
> > The socket module in Python uses_socket.so for most of its behavior.
> > I want to modify the code that generates the_socket.so file.
> > I need the source file and instructions on how tocompileand build
> >_socket.so for Windows.
> > Can anyone point me to where I can find the source and/or
> > documentation for compiling a python shared object on Windows?
>
> You need the Python source tree (download the .tar.gz) and the correct
> compiler in order to build a .dll / .pyd file on Windows. For Python 2.4
> and 2.5 you need Visual Studio 2003 (VC7.1), for Python 2.6 and 3.0 you
> have to install Visual Studio 2008 (VC9).
>
> The code for the_socketextension is in the Modules/ subdirectory of
> the source tree.
>
> Christian

Thanks that was very helpful.  I was browsing the source tree and
found socketmodule.c which I assume is the source for _socket.pyd.  I
also found http://docs.python.org/extending/windows.html which is some
documentation for building python extensions in windows.  The _socket
module is a bit different as there seems to be code imported from the
dll as well as having code written in python in socket.py.  Also the
naming convention is different with the socket module as well.

Thanks
-Mike




Thanks
-Mike


From gabriel.rossetti at arimaz.com  Wed Feb 18 09:24:35 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Wed, 18 Feb 2009 15:24:35 +0100
Subject: Python/environment problem with char encoding/decoding
In-Reply-To: <gnh4vf$rp0$02$1@news.t-online.com>
References: <mailman.190.1234965056.11746.python-list@python.org>
	<gnh4vf$rp0$02$1@news.t-online.com>
Message-ID: <499C1A23.6060204@arimaz.com>

Peter Otten wrote:
> Gabriel Rossetti wrote:
>
>   
>> Hello everyone,
>>
>> I originally posted this on the Twisted mailing list, but now it seams
>> to be  a more general python/environment problem. If I run the attached
>> example in Eclipse, it works, if I run it from a terminal, it doesn't, I
>> get :
>>
>> $ python xml_parser_test.py
>> Traceback (most recent call last):
>>   File "xml_parser_test.py", line 30, in <module>
>>     res = rawXmlToElement("<t>re?u</t>")
>>   File "xml_parser_test.py", line 21, in __call__
>>     tmp.addRawXml(s)
>>   File "/usr/lib/python2.5/site-packages/twisted/words/xish/domish.py",
>> line 538, in addRawXml
>>     self.children.append(SerializedXML(rawxmlstring))
>> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5:
>> ordinal not in range(128)
>>
>> Does anyone understand why it doesn't work outside of Eclipse? My OS is
>> Linux (Ubuntu 8.04).
>>     
>
> On the contrary, I don't understand why it would work in Eclipse ;)
>
> addRawXml(s) seems to be a fancy way to create a unicode string, and
> unicode(s) will work either if s is a bytestring that doesn't contain any
> non-ascii characters or if s is a unicode string (at least these are the
> relevant cases here).
>
> Try changing your program to use a unicode literal:
>
> # -*- coding: utf-8 -*-
> ...
> if ...
>     res = rawXmlToElement(u"<t>re?u</t>")
>
> Peter
> --
>
>   
Hello Peter, that works, thanks! I was sure I had tried that at some 
point, but I must have had another problem that made me remove it. Thank 
you again!
Gabriel


From steve at holdenweb.com  Wed Feb 18 09:27:25 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 09:27:25 -0500
Subject: Python-list Digest, Vol 65, Issue 365
In-Reply-To: <783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>
References: <mailman.747.1234948421.11745.python-list@python.org>
	<783b47270902180131k3c14e190ocb3d2e5b546f32e@mail.gmail.com>
Message-ID: <gnh5sm$6e3$1@ger.gmane.org>

M Kumar wrote:
> 
> I think the given statement below will give you what you r looking
> <imported module name>.__file__print
> 
[followed by a whole Python list digest]

When replying to a question from a digest posting, PLEASE change the
subject line and only quote the relevant piece of the original posting.
Thank you.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From james at agentultra.com  Wed Feb 18 10:15:51 2009
From: james at agentultra.com (J Kenneth King)
Date: Wed, 18 Feb 2009 07:15:51 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <878wo4verq.fsf@agentultra.com>
	<mailman.176.1234940532.11746.python-list@python.org>
Message-ID: <874oyrvkrc.fsf@agentultra.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Tue, 17 Feb 2009 21:12:57 -0200, J Kenneth King
> <james at agentultra.com>  escribi?:
>
>> I recently started a project called TracShell
>> (http://code.google.com/p/tracshell) where I make heavy use of the
>> xmlrpclib core module.
>>
>> When the number of RPC calls was small, wrapping each call in try/except
>> was acceptable. However, this obviously will duplicate code all over the
>> place. There are only ever two exceptions that the module itself will
>> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
>> but not show stoppers.
>>
>> To combat the duplication, my clever idea was to use a function
>> decorator to wrap any function that used xmlrpclib calls:
>>
>> def catch_errors(fn):
>>     """
>>     A decorator to catch typical xmlrpclib exceptions
>>     """
>>     def wrapped(*args, **kwargs):
>>         try:
>>             return fn(*args, **kwargs)
>>         except xmlrpclib.ProtocolError, e:
>>             print "There was a problem communicating with the server."
>>             print "URL: %s" % e.url
>>             print "Headers: %s" % e.headers
>>             print "Error code: %d" % e.errcode
>>             print "Error message: %s" % e.errmsg
>>             print "Please file a report with the TracShell developers."
>>             pass
>>         except xmlrpclib.Fault, e:
>>             print "A fault ocurred"
>>             print "Fault code: %d" % e.faultCode
>>             print "Fault string: %s" % e.faultString
>>             print "If you think this message is the result of an error,"
>>             print "please file a report with the TracShell developers."
>>             pass
>>     return wrapped
>
> I don't like the idea of "hiding" an exception. The caller code
> doesn't  know an exception occurred, and just continue doing its work,
> with bogus  results... is this what you want? Also, you don't include
> the stack trace  - and usually it contains very valuable
> information. When your users start  "filing a report with the
> TracShell developers" and you feel clueless, a  stack trace is
> important (you don't have to show it on screen - a log file  is even
> better).
>
> If all you want is to customize the error message, use sys.except_hook
>
> Looking into the code, those "pass" statement are useless; and error
> messages are usually written to stderr instead of stdout.

Thanks for the ideas.

I haven't actually used this pattern in any projects before, I was just
looking for a way to reduce the number of common try/except statements I
needed to have in my code; especially when they all looked exactly the
same and were catching every single xml-rpc call littered throughout my
class.

sys.except_hook looks more like what I was aiming for. I like Lisp's
"restarts," where I can define error condition handlers in one place
without having to litter my code with error handling statements.

Cheers.



From metallourlante at gmail.com  Wed Feb 18 10:16:10 2009
From: metallourlante at gmail.com (Alex)
Date: Wed, 18 Feb 2009 07:16:10 -0800 (PST)
Subject: Searching Google?
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
	<702dm1FkrikgU1@mid.dfncis.de>
Message-ID: <d8c59c85-14c3-4c5c-bc2d-3f84a625dc97@i38g2000yqd.googlegroups.com>

On Feb 18, 1:36?pm, Johannes Bauer <dfnsonfsdu... at gmx.de> wrote:
> Curt Hash schrieb:
>
> > You just need to change your User-Agent so that Google doesn't know a
> > Python script is making the request:
>
> Why would Google not send a response if the User-Agent header field is
> not a recognized browser?

Because making automated queries to Google is against its TOS so
Google block any client that doesn't seam to be human.
On the other hands Google's API does not return the same exact result
as in a normal web query.
My suggestion is: set a browser like User agent and accept gzipped
content to be as friendly as possible and don't do too many queries in
a small time span.
Parsing Google result page with Beautifulsoup is a piece of cake.

Alex


From bieffe62 at gmail.com  Wed Feb 18 10:19:20 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Wed, 18 Feb 2009 07:19:20 -0800 (PST)
Subject: Threads in PyGTK: keep typing while ping-ing
References: <mailman.83.1234835960.11746.python-list@python.org>
Message-ID: <6f45d1c5-abce-4be1-81de-be47163d81ed@h5g2000yqh.googlegroups.com>

On 17 Feb, 02:53, Mamahita Sela <mamahitas... at yahoo.com> wrote:
> Dear FB,
>
> > As you have been already told, join() blocks until the
> > thread is
> > terminated. and you should avoid that.
> > A simple fix could by add a timeout to t.join, doing
> > something like :
> > ? ? ? ? t.join(JOIN_TIMEOUT);
> > ? ? ? ? if not t.isAlive():
> > ? ? ? ? ? ? print t.result
>
> Thanks for your great sample. And, thank you for your tips on speedup the ping stuff.
>
> However, i still have problem when adding timeout to join().
> - It works, but only print out thread result that is not alive, as we put in the code. So, i never get result from unsuccessful ping action, which might take more time than timeout specified.
> - I still have little delay in GUI. Is it possible to make it smooth in GUI operation? When i put more timeout (say: 0.5 from 0.2), i will have to wait ?longer.
>
> PS: thanks for pointing out inefficient ping action :) I will follow the tips. But, another time I might need to do something else, like downloading files, or checking for serial devices. So, this thread thing, imho, is very important.
>
> Any help would be very appreciated.
> M.


You could make all_threads an attribute of main instance, and use it
to keep track of thread still alive. Therefore your
do_ping code shoulds be somethiong like this (NOT TESTED):

       for h in range(100, 105):
            host = '192.168.0.%d' %(h)
            #
            worker = PingHost(host)
            worker.start()
            self.all_threads.append(worker)
        #
        for t in self.all_threads:
           t.join(JOIN_TIMEOUT);
           if not t.isAlive():
                print t.result
                self.all_threads.remove(t)

        #
        return True


In this way, you could use a small value for JOIN_TIMEOUT and make the
GUI more responsive. The thread which are not
found completed when do_ping is called will stay in self.all_threads
and will be tested next time.
I did not check the documentation, but assumed that
gobject.timeout_add installs a _periodic_ timer. If it is not
so, you have to reinstall the timer at the end of do_ping, if
self.all_threads is not empty.
And don't forget to initialize self.all_threads in __init__ ;)

HTH

Ciao
-----
FB







From python at bdurham.com  Wed Feb 18 10:23:36 2009
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 18 Feb 2009 10:23:36 -0500
Subject: Best practice for upgrading the version of SQLite bundled with 
	Python 2.6.1
In-Reply-To: <op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>
References: <1234926555.19179.1300986603@webmail.messagingengine.com>
	<op.upjbkpwux6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1234970616.27485.1301081573@webmail.messagingengine.com>

Gabriel,

> At least on Windows, you only have to replace sqlite3.dll (in the DLLs directory) with the new one, and that's all.

That's easy! :)

Thank you,

Malcolm


From mad.vijay at gmail.com  Wed Feb 18 10:27:30 2009
From: mad.vijay at gmail.com (SamG)
Date: Wed, 18 Feb 2009 07:27:30 -0800 (PST)
Subject: Crypto headaches.
References: <093e5e7e-0f64-4737-8eae-bc6c9ecab1ee@q40g2000prh.googlegroups.com>
	<mailman.191.1234966245.11746.python-list@python.org>
Message-ID: <fcb780ee-f258-407a-b809-979e8cf120fc@l33g2000pri.googlegroups.com>

On Feb 18, 7:10 pm, "M.-A. Lemburg" <m... at egenix.com> wrote:
> On 2009-02-18 14:23, SamG wrote:
>
> > Hi,
>
> > Using the python's Crypto.Cipher.Blowfish is create and encrypted file
> > in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
> > error stating "bad magic number".
>
> Are you getting the error message from openssl ? It looks a lot
> like an error message from Python.
>
> > I tried
> > $ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
> > or
> > $ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file
>
> > BTW, decryption using a python code works well. But i m of the
> > impression a file encry with one program should/can be decrypt with
> > another program (in my case openssl) using the same parameters.
>
> Ideally, that should work, but you also have to make sure that
> the following two details are the same for both applications:
>
>  1. the way padding is done (Blowfish is a block cipher)
>
>  2. the way the initialization vector is set
>
> Otherwise the two won't interoperate properly.
>
> --
> Marc-Andre Lemburg
> eGenix.com
>
> Professional Python Services directly from the Source  (#1, Feb 18 2009)>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
> >>> mxODBC.Zope.Database.Adapter ...            http://zope.egenix.com/
> >>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
>
> ________________________________________________________________________
>
> ::: Try our new mxODBC.Connect Python Database Interface for free ! ::::
>
>    eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
>     D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
>            Registered at Amtsgericht Duesseldorf: HRB 46611
>                http://www.egenix.com/company/contact/

That must be it...

But given a password how do i generate a (key, IV) pair???

SamG


From oswald.harry at gmail.com  Wed Feb 18 11:29:34 2009
From: oswald.harry at gmail.com (harryos)
Date: Wed, 18 Feb 2009 08:29:34 -0800 (PST)
Subject: how to list all installed modules
Message-ID: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>

hi
Is there a way to list all the installed modules in my python
installation.I recently installed pygame and when i tried to import it
like
>>import pygame
it complained that no such module was found.I can see the pygame
directory in F:\Python25\Lib\site-packages in my machine,but am unable
to import the module.So I was wondering if there is a way to list all
the installed modules

any help much appreciated
thanks
harry


From __peter__ at web.de  Wed Feb 18 11:42:07 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 17:42:07 +0100
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
Message-ID: <gnhdor$vql$03$1@news.t-online.com>

harryos wrote:

> Is there a way to list all the installed modules in my python
> installation.I recently installed pygame and when i tried to import it
> like
>>>import pygame
> it complained that no such module was found.I can see the pygame
> directory in F:\Python25\Lib\site-packages in my machine,but am unable
> to import the module.So I was wondering if there is a way to list all
> the installed modules

>>> help("modules")

may help to get a list of modules (if it doesn't fail with an exception as
over here). 

Regarding the original problem, do you have multiple Python installations? 
If so, you may accidentally be running the "wrong" python.

Peter


From zamnedix at gmail.com  Wed Feb 18 11:45:16 2009
From: zamnedix at gmail.com (Zamnedix)
Date: Wed, 18 Feb 2009 08:45:16 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
Message-ID: <a59e2f87-2878-4534-8e04-eb9eee2b27eb@l1g2000yqj.googlegroups.com>

On Feb 9, 12:58?pm, rantingrick <rantingr... at gmail.com> wrote:
> Hello all,
>
> It has long been my dream to create an open source 3D CAD program and
> i am starting to crawl my way into the first steps. I now believe i am
> ready to start this endeavor and i am currently looking for fellow
> Python programmers (no matter what skill level) to get started
> brainstorming this design.
>
> I have a real good idea of the UI design and at this point i just want
> to start simple and build this thing. I figure this will be a good
> learning experience for myself and others and in the process i can
> realize my dream. And if all this turns out to be is a learning
> experience, well nobody lost.
>
> Of course Python will limit the speed here, but at this point i want
> to get a template up and running. Speed does not matter at this point,
> and optimizations can come along later as i am sure a few complete re-
> writes are inevitable :)
>
> My initial start will cover a very simple user interface something
> like VPython but much more usable as a CAD modeler. From the start
> just a few simple primitives (faces, lines-segments) that will be the
> building blocks for more complex models like (arcs, rectangles,
> circles, polygons, cubes, spheres, etc..).
>
> There will need to be mouse picking as i see this application as a
> very interactive environment. Of course in the beginning all
> interaction will most likely be in a command line type manner until
> the functionality can be worked out.
>
> There will need to be a hierarchy of instancing and grouping within
> the model to facilitate easy transformation of entities within the
> model.
>
> I am not too worried about any sort of texturing at this point. I want
> to squeeze as much speed as possible and prettiness will come in due
> course. I also have no plans for layering, or multiple scenes at this
> time. Simple functionality is the end game here.
>
> Once the UI is there and the modeling work flow is worked out,
> everything should be a component add-on from there.
>
> So the main points are...
>
> #-- Entities --#
> ?face
> ?line-segment
>
> #-- Hierarchy --#
> ?Entity (one face, or line-segment)
> ?Group (contained of multiple entities that can be translated,
> rotated, scaled as one)
> ?Instance (component definition)
>
> #-- Tools --#
> ?line
> ?rect
> ?circle
> ?arc
> ?select
> ?rotation
> ?translation
> ?scale
> ?extrusion along path
> ?measurement
>
> So there it is. Any takers? :)

I realize this isn't necessarily CAD, but...
http://www.blender.org/


From oswald.harry at gmail.com  Wed Feb 18 12:08:14 2009
From: oswald.harry at gmail.com (harryos)
Date: Wed, 18 Feb 2009 09:08:14 -0800 (PST)
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
	<gnhdor$vql$03$1@news.t-online.com>
Message-ID: <48383a90-80a0-4c2f-a79c-47c9c480581c@g3g2000pre.googlegroups.com>

On Feb 18, 9:42?pm, Peter Otten <__pete... at web.de> wrote:
> >>> help("modules")

thanks Peter.That helped.
> Regarding the original problem, do you have multiple Python installations?
> If so, you may accidentally be running the "wrong" python.

I have only one installation.It shows all other modules.I will try
reinstalling .
regards,
harry



From sam at 2000soft.com  Wed Feb 18 12:08:41 2009
From: sam at 2000soft.com (Sam Clark)
Date: Wed, 18 Feb 2009 09:08:41 -0800
Subject: Revision Control
Message-ID: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>

Any suggestions for a beginer on what to use for version control?   It's just me, the lone person programming.  I've already nailed one "version" of my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus I really don't like MS much...  Any free open source stuff out there?
 
Thank you,
 
Sam Clark
sam at 2000soft.com
 
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From clp2 at rebertia.com  Wed Feb 18 12:12:03 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 18 Feb 2009 09:12:03 -0800
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>

On Wed, Feb 18, 2009 at 9:08 AM, Sam Clark <sam at 2000soft.com> wrote:
> Any suggestions for a beginer on what to use for version control?   It's
> just me, the lone person programming.  I've already nailed one "version" of
> my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus
> I really don't like MS much...  Any free open source stuff out there?

I like Mercurial (hg) personally: http://www.selenic.com/mercurial/wiki/
It's written in Python, works well on Windows, is a modern distributed
VCS, and is simpler than Git.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From zaheer.agadi at gmail.com  Wed Feb 18 12:13:17 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Wed, 18 Feb 2009 09:13:17 -0800 (PST)
Subject: why do I get name not defined error
Message-ID: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>

Hi,

 I have the following declared in my class, I am trying tp call a
method defined in the same class
I am not sure why I am getting name not defined error

    if options.uploadFile != None :
        print "This is path", the_rest
        filePath = the_rest
        UploadFile(None,filePath)

def UploadFile(self,path):
    print "I wil upload now"
    os.chdir(homeFolder)
    config = ConfigParser.ConfigParser()
    .....

any ideas why the error name UploadFile not defined

Thnaks




From deets at nospam.web.de  Wed Feb 18 12:17:00 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 18 Feb 2009 18:17:00 +0100
Subject: why do I get name not defined error
In-Reply-To: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
References: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
Message-ID: <702u4dFmcsarU1@mid.uni-berlin.de>

zaheer.agadi at gmail.com schrieb:
> Hi,
> 
>  I have the following declared in my class, I am trying tp call a
> method defined in the same class
> I am not sure why I am getting name not defined error
> 
>     if options.uploadFile != None :
>         print "This is path", the_rest
>         filePath = the_rest
>         UploadFile(None,filePath)
> 
> def UploadFile(self,path):
>     print "I wil upload now"
>     os.chdir(homeFolder)
>     config = ConfigParser.ConfigParser()
>     .....
> 
> any ideas why the error name UploadFile not defined
> 

Because you need to define things *before* you use them the first time. 
This is not to be confused with forward-declarations, as they are needed 
in C for example - in python you can do


def foo():
    bar()

def bar():
    foo()


(resulting in an endless loop of course)

But you can't do


def foo():
    bar()

foo() # this will fail

def bar():
    foo()



Diez


From __peter__ at web.de  Wed Feb 18 12:22:36 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 18:22:36 +0100
Subject: why do I get name not defined error
References: <092b37eb-1ac6-4cbb-8059-e0f8495de4f7@p2g2000prf.googlegroups.com>
Message-ID: <gnhg4o$67f$00$1@news.t-online.com>

zaheer.agadi at gmail.com wrote:

>  I have the following declared in my class, I am trying tp call a
> method defined in the same class
> I am not sure why I am getting name not defined error
 
Assuming this is part of a method

def method(self):
>     if options.uploadFile != None :
>         print "This is path", the_rest
>         filePath = the_rest
>         UploadFile(None,filePath)

you have to change the above line to

          self.UploadFile(filePath)
 

Now consider reading a tutorial before you proceed.

Peter


From benjamin.kaplan at case.edu  Wed Feb 18 12:39:53 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 18 Feb 2009 12:39:53 -0500
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>

On Wed, Feb 18, 2009 at 12:08 PM, Sam Clark <sam at 2000soft.com> wrote:

>  Any suggestions for a beginer on what to use for version control?   It's
> just me, the lone person programming.  I've already nailed one "version" of
> my code accidentaly.  MS VSS is too expensive for the stuff I'm doing, plus
> I really don't like MS much...  Any free open source stuff out there?
>

There's actually a lot of them. These are just the ones I can think of off
the top of my head.
-CVS (One of the first RCS, I think most projects are moving away from this
one.)
- Subversion-(pretty popular right now, but it is a client/server model.)
-Git (originally created for Linux and now used by several very large
projects)
-Mercurial (this is a big up and coming RCS)
-Bazaar (written in Python. Also pretty new. I don't know about Windows
support)

I have some experience with both Subversion and Mercurial and like them
both. Since you're working alone, you'll probably want a distributed rcs,
such as Mercurial, Git, and Bazaar, which allow you to do more stuff locally
rather than on a central server. Like Chris, I'd suggest Mercurial
especially if you're using Windows.


Thank you,
>
> Sam Clark
> sam at 2000soft.com
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From Scott.Daniels at Acm.Org  Wed Feb 18 13:10:53 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 10:10:53 -0800
Subject: how to list all installed modules
In-Reply-To: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
Message-ID: <4-6dndjITMU90wHUnZ2dnUVZ_qvinZ2d@pdx.net>

harryos wrote:
> Is there a way to list all the installed modules in my python
> installation.I recently installed pygame and when i tried to import it
> like
>>> import pygame
> it complained that no such module was found.I can see the pygame
> directory in F:\Python25\Lib\site-packages in my machine,but am unable
> to import the module.So I was wondering if there is a way to list all
> the installed modules

Are you running F:\Python25\python.exe (or F:\Python25\pythonw.exe)?
open a command window (run cmd), and type:
     C:\> python
     ...
     >>> import sys
     >>> for dirname in  sys.path:
             print sys.path

I suspect something you see printed will surprise you.
Either the banner, identifying a Python version you were
not expecting, or perhaps a bunch of C:-based directories.
If this does not help you decipher the problem, try running
      python -v
Python verbose mode (You will get a _lot_ of output).
Then, when you (finally) get a ">>>" prompt, type:
    >>> import pygame
and you will see eaxctly what lookups are tried.

--Scott David Daniels
Scott.Daniels at Acm.Org


From thomasmallen at gmail.com  Wed Feb 18 13:17:39 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Wed, 18 Feb 2009 10:17:39 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
Message-ID: <788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com>

On Feb 18, 4:51?am, alex23 <wuwe... at gmail.com> wrote:
> On Feb 18, 7:34?pm, rdmur... at bitdance.com wrote:
>
> > Yeah, but wget -r -k will do that bit of it, too.
>
> Wow, nice, I don't know why I never noticed that. Cheers!

Hm...doesn't do that over here. I thought it may have been because of
absolute links (not to site root), but it even leaves things like <a
href="/">. Does it work for you guys?


From skip at pobox.com  Wed Feb 18 13:34:09 2009
From: skip at pobox.com (skip at pobox.com)
Date: Wed, 18 Feb 2009 12:34:09 -0600
Subject: Revision Control
In-Reply-To: <50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<50697b2c0902180912n2ba49600md70eefd7cc2260@mail.gmail.com>
Message-ID: <18844.21665.189434.503197@montanaro.dyndns.org>


    >> Any suggestions for a beginer on what to use for version control?

    Chris> I like Mercurial (hg) personally...

Me too.  It's perfect for little one-person things.  (It's probably good for
other stuff as well, but I certainly like how easy it is to use for
standalone stuff.)

-- 
Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/


From python.list at tim.thechases.com  Wed Feb 18 13:36:17 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 18 Feb 2009 12:36:17 -0600
Subject: Revision Control
In-Reply-To: <ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
Message-ID: <499C5521.2040705@tim.thechases.com>

> -CVS (One of the first RCS, I think most projects are moving away from this
> one.)

I wouldn't suggest starting a new project with CVS.  Subversion 
(svn) resolves several of the main issues with it, so using SVN 
instead wins over CVS in just about every possible way.

> - Subversion-(pretty popular right now, but it is a client/server model.)

A good solid & popular choice, but the merging capabilities are a 
bit weak (the latest version just added some better capabilities 
for branching/merging, but it's a bit of a hack).  It's also not 
the most efficient storage -- git and mercurial (hg) both have 
very efficient repository structures compared to SVN.  The family 
DVCS tools (git, mercurial, bzr, darcs) are stronger in this 
area.  My employer uses SVN for their primary repository. 
Documentation is outstandingly good (documentation for the others 
is also good, but SVN's is exceptional).

> -Git (originally created for Linux and now used by several very large
> projects)

I've tried several times to like git -- some folks swear by it. 
The Win32 support has been a bit wanting, but growing.  I find it 
a bit more complex but it's certainly not lacking for power. 
I'll continue to try it occasionally to see if it meets my needs 
better than Mercurial

> -Mercurial (this is a big up and coming RCS)

This is currently my favorite:  good branching/merging, fast, 
written mostly in Python (one C extension module, IIRC), and a 
simple interface

> -Bazaar (written in Python. Also pretty new. I don't know about Windows
> support)

I like Bazaar (bzr), but the last several times I've tried it, 
it's been a little slow.  This has been steadily improving, and I 
like their emphasis on correctness foremost.  It's a lot like 
mercurial, but is pure python (no C extension module) which makes 
it nice to deploy into environments such as my shared web-hosting 
service where I can't build extension C modules or install 
packages such as hg/git/svn from the repository.

All of them have GUI interfaces if you need, but I tend to just 
use them from the command-line.  For most of them, you can get by 
with a handful of commands without needing to learn every last 
corner.

For what you (the OP) describe, I'd suggest SVN, Mercurial, or 
Bazaar as they're a little easier to wrap your head around -- SVN 
wins for documentation, Mercurial wins for speed and merging, and 
Bazaar wins for portability and merging.  Git would win for sheer 
power, but if you're just beginning, I'd skip it for now.

-tkc










From lionel.keene at gmail.com  Wed Feb 18 13:48:56 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 10:48:56 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com>
Message-ID: <a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com>

On Feb 18, 12:56?am, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 17, 3:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hello all,
>
> > On a previous thread (http://groups.google.com/group/comp.lang.python/
> > browse_thread/thread/64da35b811e8f69d/67fa3185798ddd12?
> > hl=en&lnk=gst&q=keene#67fa3185798ddd12) I was asking about reading in
> > binary data. Briefly, my data consists of complex numbers, 32-bit
> > floats for real and imaginary parts. The data is stored as 4 bytes
> > Real1, 4 bytes Imaginary1, 4 bytes Real2, 4 bytes Imaginary2, etc. in
> > row-major format. I needed to read the data in as two separate numpy
> > arrays, one for real values and one for imaginary values.
>
> > There were several very helpful performance tips offered, and one in
> > particular I've started looking into. The author suggested a
> > "numpy.memmap" object may be beneficial. It was suggested I use it as
> > follows:
>
> > descriptor = dtype([("r", "<f4"), ("i", "<f4")])
> > data = memmap(filename, dtype=descriptor, mode='r').view(recarray)
> > print "First 100 real values:", data.r[:100]
>
> > I have two questions:
> > 1) What is "recarray"?
>
> Let's look:
>
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import numpy
> >>> numpy.recarray
>
> <class 'numpy.core.records.recarray'>
>
> >>> help(numpy.recarray)
>
> Help on class recarray in module numpy.core.records:
>
> class recarray(numpy.ndarray)
> ?| ?recarray(shape, dtype=None, buf=None, **kwds)
> ?|
> ?| ?Subclass of ndarray that allows field access using attribute
> lookup.
> ?|
> ?| ?Parameters
> ?| ?----------
> ?| ?shape : tuple
> ?| ? ? ?shape of record array
> ?| ?dtype : data-type or None
> ?| ? ? ?The desired data-type. ?If this is None, then the data-type is
> determine
> ?| ? ? ?by the *formats*, *names*, *titles*, *aligned*, and
> *byteorder* keywords
> ?| ?buf : [buffer] or None
> ?| ? ? ?If this is None, then a new array is created of the given
> shape and data
> ?| ? ? ?If this is an object exposing the buffer interface, then the
> array will
> ?| ? ? ?use the memory from an existing buffer. ?In this case, the
> *offset* and
> ?| ? ? ?*strides* keywords can also be used.
> ...
>
> So there you have it. ?It's a subclass of ndarray that allows field
> access using attribute lookup. ?(IOW, you're creating a view of the
> memmap'ed data of type recarray, which is the type numpy uses to
> access structures by name. ?You need to create the view because
> regular numpy arrays, which numpy.memmap creates, can't access fields
> by attribute.)
>
> help() is a nice thing to use, and numpy is one of the better
> libraries when it comes to docstrings, so learn to use it.
>
> > 2) The documentation for numpy.memmap claims that it is meant to be
> > used in situations where it is beneficial to load only segments of a
> > file into memory, not the whole thing. This is definately something
> > I'd like to be able to do as my files are frequently >1Gb. I don't
> > really see in the diocumentation how portions are loaded, however.
> > They seem to create small arrays and then assign the entire array
> > (i.e. file) to the memmap object. Let's assume I have a binary data
> > file of complex numbers in the format described above, and let's
> > assume that the size of the complex data array (that is, the entire
> > file) is 100x100 (rows x columns). Could someone please post a few
> > lines showing how to load the top-left 50 x 50 quadrant, and the lower-
> > right 50 x 50 quadrant into memmap objects? Thank you very much in
> > advance!
>
> You would memmap the whole region in question (in this case the whole
> file), then take a slice. ?Actually you could get away with memmapping
> just the last 50 rows (bottom half). ?The offset into the file would
> be 50*100*8, so:
>
> data = memmap(filename, dtype=descriptor, mode='r',offset=
> (50*100*8)).view(recarray)
> reshaped_data = reshape(data,(50,100))
> intersting_data = reshaped_data[:,50:100]
>
> A word of caution: Every instance of numpy.memmap creates its own mmap
> of the whole file (even if it only creates an array from part of the
> file). ?The implications of this are A) you can't use numpy.memmap's
> offset parameter to get around file size limitations, and B) you
> shouldn't create many numpy.memmaps of the same file. ?To work around
> B, you should create a single memmap, and dole out views and slices.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

Thanks Carl, I like your solution. Am I correct in my understanding
that memory is allocated at the slicing step in your example i.e. when
"reshaped_data" is sliced using "interesting_data = reshaped_data[:,
50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
is constructed that memmaps the entire file. Some relatively small
amount of memory is allocated for the memmap operation, but the bulk
memory allocation occurs when I generate my final numpy sub-array by
slicing, and this accounts for the memory efficiency of using memmap?


From johnson at pharmacy.arizona.edu  Wed Feb 18 14:28:15 2009
From: johnson at pharmacy.arizona.edu (bleah)
Date: Wed, 18 Feb 2009 11:28:15 -0800 (PST)
Subject: PIL install driving me mad! With solution!
Message-ID: <c24de59f-bd92-4dcb-bcbe-6563eabea96c@x29g2000prf.googlegroups.com>

I'm trying to get PIL 1.16 installed on a SUSE SLES10 system, and
cannot, for the life of me, get the thing to compile with jpeg
support.

The libjpeg-devel libraries are installed, and are present in /usr/lib
JUST WHERE SPECIFIED in the setup.py file, and the jpeglib.h incliude
file is present  JUST WHERE SPECIFIED in the setup.py file.

The build process proceeds without errors, yet selftest.py fails with
the error:

tonic:~/html2pdf_sources/Imaging-1.1.6 # python selftest.py
*****************************************************************
Failure in example: _info(Image.open("Images/lena.jpg"))
from line #24 of selftest.testimage
Exception raised:
Traceback (most recent call last):
  File "./doctest.py", line 499, in _run_examples_inner
    exec compile(source, "<string>", "single") in globs
  File "<string>", line 1, in <module>
  File "./selftest.py", line 22, in _info
    im.load()
  File "PIL/ImageFile.py", line 180, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available
1 items had failures:
   1 of  57 in selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.


Again and again and again.


I found this post  http://blog.tlensing.org/2008/12/04/kill-pil-?-the-python-imaging-library-headache
which provided the solution.

When you run selftest.py in the Imaging-1.1.6 directory, python finds
the PIL.pth and PIL file and directory, respectively and uses those
instead of the properly compiled versions in the python directories.

So PIL is installed, it IS working perfectly, it's selftest.py that's
failing...


From lionel.keene at gmail.com  Wed Feb 18 14:43:09 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 11:43:09 -0800 (PST)
Subject: PyGTK install
Message-ID: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>

Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
post here and hope someone new the answer. I feel it's a silly
problem, maybe something to do with a path variable? The problem: I've
downloaded the "all-in-one" windows binary installer for PyGTK from
their website. After typing in their first tutorial program and trying
to run from the command line, I get:

"This application has failed to start because libglib-2.0-0.dll was
not found" error dialog.

The traceback indicates this is happening at the "import gtk" line. A
quick search of my install directory for PyGTK indicates that the file
is indeed resident and located in C:\Program files\PyGTK\GTK\bin.

Is there some some sort of path variable for Python I need to modify
and, if so, how is this done? Thanks so much, and my apologies if this
is the wrong forum.

-L


From jervisau at gmail.com  Wed Feb 18 14:44:02 2009
From: jervisau at gmail.com (Jervis Whitley)
Date: Thu, 19 Feb 2009 06:44:02 +1100
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
Message-ID: <8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>

>
> What happens when you have hundreds of megabytes, I don't know.
>
>
I hope I never have to test a word that is hundreds of megabytes long
for a vowel :)


From steve at holdenweb.com  Wed Feb 18 15:05:47 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 15:05:47 -0500
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
Message-ID: <gnhpn4$n6a$1@ger.gmane.org>

Jervis Whitley wrote:
>> What happens when you have hundreds of megabytes, I don't know.
>>
>>
> I hope I never have to test a word that is hundreds of megabytes long
> for a vowel :)

I see you don't speak German ;-)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From __peter__ at web.de  Wed Feb 18 15:12:45 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 21:12:45 +0100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
Message-ID: <gnhq3n$r2b$00$1@news.t-online.com>

Steven D'Aprano wrote:

> On Wed, 18 Feb 2009 07:08:04 +1100, Jervis Whitley wrote:
> 
> 
>>> This moves the for-loop out of slow Python into fast C and should be
>>> much, much faster for very large input.
>>>
>>>
>> _Should_ be faster.
> 
> Yes, Python's timing results are often unintuitive.

Indeed.

> It seems to me that I was mistaken -- for large enough input, the running
> time of each version converges to approximately the same speed.

No, you were right. Both any_test() and for_test() use the improvement you 
suggested, i. e. loop over the vowels, not the characters of the word.
Here's the benchmark as it should have been:

$ python -m timeit -s'word = "g"*10000' 'any(v in word for v in "aeiouAEIOU")'
1000 loops, best of 3: 314 usec per loop
$ python -m timeit -s'word = "g"*10000' 'any(c in "aeiouAEIOU" for c in word)'
100 loops, best of 3: 3.48 msec per loop

Of course this shows only the worst case behaviour. The results will vary 
depending on the actual word e. g. "Ug..." or "g...a".

Peter 



From eliben at gmail.com  Wed Feb 18 15:18:27 2009
From: eliben at gmail.com (eliben)
Date: Wed, 18 Feb 2009 12:18:27 -0800 (PST)
Subject: number theory libraries / project euler
Message-ID: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>

Hello,

What are some good & recommended number theory libs for Python (or
accessible interfaces to C libs), for things like primes,
factorization, etc. Naturally, speed is of utmost importance here.

In other words, which Python libraries and tools to you use to help
you solve Project Euler problems :-) ?

Eli


From __peter__ at web.de  Wed Feb 18 15:22:45 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 18 Feb 2009 21:22:45 +0100
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>
	<mailman.203.1234987578.11746.python-list@python.org>
Message-ID: <gnhqmf$r2b$00$2@news.t-online.com>

Steve Holden wrote:

> Jervis Whitley wrote:
>>> What happens when you have hundreds of megabytes, I don't know.
>>>
>>>
>> I hope I never have to test a word that is hundreds of megabytes long
>> for a vowel :)
> 
> I see you don't speak German ;-)

I tried to come up with a funny way to point out that you're a fool.

But because I'm German I failed.

Peter


From josh.dukes at microvu.com  Wed Feb 18 15:27:04 2009
From: josh.dukes at microvu.com (Josh Dukes)
Date: Wed, 18 Feb 2009 12:27:04 -0800
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
Message-ID: <20090218122704.30bfda77@microvu.com>

You might also want to look in to open cascade. It supports a bunch of
standard 3d model formats (stl, iges, step) and has python bindings.
Salome is based on open cascade. http://www.pythonocc.org/ However, I'm
not entirely clear on the license for this so that might be an issue. I
know the Debian lawyers had some problems with Salome because it
compiled against open cascade. I believe if you made open cascade an
optional run-time dependency it could still be a valid gpl app.

It's also important to keep in mind that what most people think of as
cad/cam is really multiple things that can be broken up into modules
(cad/cam/fea). Those can also be broken up into modules (fea can be
broken into meshing, pre-processing, analysis, and post-processing). It
seems like attacking things this way might be best. If you're really
serious about this (there are lots of failed Linux cad packages) I'd
suggest setting up a project on sourceforge and get a mailing list.
Post a link to the mailing list and I'll join. I can probably find some
other mailing lists that you should try to recruit from, but having a
sourceforge page and a mailing list really helps your legitimacy. 

Another interesting project is FreeCAD, which is written in C++ but
compiled against python,
http://juergen-riegel.net/FreeCAD/Docu/index.php?title=Main_Page might
be worth looking at. 

I look forward to joining your mailing list. 

On Wed, 18 Feb 2009 01:02:22 -0800 (PST)
r <rt8396 at gmail.com> wrote:

> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.
> 
> So, yes, i have looked at both the applications you offer.
> 
> Thanks
> --
> http://mail.python.org/mailman/listinfo/python-list


-- 

Josh Dukes
MicroVu IT Department


From kwmsmith at gmail.com  Wed Feb 18 15:31:55 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Wed, 18 Feb 2009 14:31:55 -0600
Subject: number theory libraries / project euler
In-Reply-To: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <c266a7930902181231y6e5098c2q139a0129659a0eb4@mail.gmail.com>

On Wed, Feb 18, 2009 at 2:18 PM, eliben <eliben at gmail.com> wrote:
>
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.
>
> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?

There's Sage: http://www.sagemath.org/ -- I believe it aims to do
everything that Mathematica can do and more, and I know it has some
number theory libs, too.  I haven't had the occasion to use it myself.

Much of the fun of project euler problems is 'rolling your own,' or
implementing a classic algorithm from a description of it on
Wikipedia.  A good sieve of eratosthenes in pure Python (that I tend
to use quite often) is here:

http://code.activestate.com/recipes/117119/

You can find some combinatorics in numpy, I believe.

Often the solutions are one-to-five liners, if you've thought the
problem through.  Too much dependence on external libraries robs the
project euler problems of their fun, IMO.

Best,

Kurt


From andrew at acooke.org  Wed Feb 18 15:32:12 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 18 Feb 2009 17:32:12 -0300 (CLST)
Subject: number theory libraries / project euler
In-Reply-To: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <1b7a4f36961f874388857ae7e8f2a3cc.squirrel@localhost>

eliben wrote:
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.

i just read the project site and one of the things they say on their front
page is that all problems have a solution that should run in "under a
minute".  the emphasis is on finding the right algorithm, not brute force
number crunching.  so i am not sure that speed is of much importance at
all.

> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?

you may want to look at numpy and scipy, but looking at the first dozen
questions i think ordinary python may be sufficient.

andrew




From pavlovevidence at gmail.com  Wed Feb 18 15:35:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 12:35:55 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com>
Message-ID: <66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com>

On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
> Thanks Carl, I like your solution. Am I correct in my understanding
> that memory is allocated at the slicing step in your example i.e. when
> "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> is constructed that memmaps the entire file. Some relatively small
> amount of memory is allocated for the memmap operation, but the bulk
> memory allocation occurs when I generate my final numpy sub-array by
> slicing, and this accounts for the memory efficiency of using memmap?

No, what accounts for the memory efficienty is there is no bulk
allocation at all.  The ndarray you have points to the memory that's
in the mmap.  There is no copying data or separate array allocation.

Also, it's not any more memory efficient to use the offset parameter
with numpy.memmap than it is to memmap the whole file and take a
slice.


Carl Banks


From cs at zip.com.au  Wed Feb 18 16:33:50 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Thu, 19 Feb 2009 08:33:50 +1100
Subject: Musings: Using decorators to reduce duplicate exception handling
In-Reply-To: <878wo4verq.fsf@agentultra.com>
Message-ID: <20090218213350.GA23549@cskk.homeip.net>

On 17Feb2009 15:12, J Kenneth King <james at agentultra.com> wrote:
| I recently started a project called TracShell
| (http://code.google.com/p/tracshell) where I make heavy use of the
| xmlrpclib core module.
| 
| When the number of RPC calls was small, wrapping each call in try/except
| was acceptable. [...]
| To combat the duplication, my clever idea was to use a function
| decorator to wrap any function that used xmlrpclib calls:
| def catch_errors(fn):
[...]
| Maybe I could rename the decorator to something meaningful, but besides
| that it works pretty well. Now any function I write in my class that
| uses RPC calls can be wrapped by this decorator and have the exception
| handling done in a uniform way for these particular exceptions.

My Python fu is still weak, but I had a similar issue last year and
wrote a context manager, used thus:

  with NoExceptions(handler):
      ... do stuff that may break ...

The constructor takes a handleException argument (which may be None, but it
has to be explicit) to tune which exceptions are caught; default is
everything. This was for a daemon thread that did RPC calls, so it was
actually fairly important to never die; normally you'd want to catch only
specific exceptions.

Code:

  class NoExceptions(object):
      ''' A context manager to catch _all_ exceptions and log them.
          Arguably this should be a bare try...except but that's syntacticly
          noisy and separates the catch from the top.
      '''

      def __init__(self, handleException):
          ''' Initialise the NoExceptions context manager.
              The handleException is a callable which
              expects (exc_type, exc_value, traceback)
              and returns True or False for the __exit__
              method of the manager.
              If handleException is None, the __exit__ method
              always returns True, suppressing any exception.
          '''
          self.__handler = handleException

      def __enter__(self):
          pass

      def __exit__(self, exc_type, exc_value, traceback):
          if self.__handler is not None:
              return self.__handler(exc_type, exc_value, traceback)
          if exc_type is not None:
              print >>sys.stderr, "ignore %s" % (exc_type,)
          return True

It doesn't actually solve your duplication issue and is a bit of a niche
application, but it's a lot shorter than an inline try/except and to my eye
reads a little better, and it keeps the exception handling up front at the
calling end where it is visible.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/


From gagsl-py2 at yahoo.com.ar  Wed Feb 18 16:39:24 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 19:39:24 -0200
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<gnh565$5fd$1@ger.gmane.org>
Message-ID: <op.upkg3y2ix6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 12:15:25 -0200, Steve Holden <steve at holdenweb.com>  
escribi?:
> gtillmon wrote:

>> I would like to know how to display and store the path of each mondule
>> that is called.
> It's certainly possible to trace function calls, if that would help.
> sys.settrace allows you to establish a function that gets called

If the OP is only interested in import statements, perhaps the -v flag is  
enough:

python -v script_name.py

It prints a line (on stderr) for each module imported, stating its name  
and source file.

-- 
Gabriel Genellina



From rgoldman23 at gmail.com  Wed Feb 18 16:42:05 2009
From: rgoldman23 at gmail.com (Rudi Goldman)
Date: Wed, 18 Feb 2009 13:42:05 -0800
Subject: Delete lines which contain string in a file
Message-ID: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>

Hi,
Go easy on me as I am a new to Python and am trying to solve a practical
problem that is driving me bananas.
Basically I have 2 text files, a source and a target. I want to be able to
delete all of the lines in the target file which contain text from any line
in the source file.
i.e.
Source:                                     Target:
111                                           xxx 111 yyy
222                                           xxx  333 sss
333                                           jjj   444 sss

After executing this code the target file should only consist of the line:
  jjj   444 sss
Any help on this one would be greatly appreciated.

Thanks,
Rudi
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From castironpi at gmail.com  Wed Feb 18 16:43:45 2009
From: castironpi at gmail.com (Aaron Brady)
Date: Wed, 18 Feb 2009 13:43:45 -0800 (PST)
Subject: PyTypeObject subclass
Message-ID: <f525a751-4ffb-49a2-829a-1c1290c3c097@u18g2000pro.googlegroups.com>

Hi,

Is it ok to subclass PyTypeObject, so that my custom 'tp_' fields can
appear at the bottom of it?  Is there anything like size requirements
going on in its code?  Or is it better to use 'tp_dict' or slots?

Thanks.



From tim.wintle at teamrubber.com  Wed Feb 18 16:46:24 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 21:46:24 +0000
Subject: Searching Google?
In-Reply-To: <702dm1FkrikgU1@mid.dfncis.de>
References: <6d1caedf-7d94-49e6-8a34-d4037202b7c7@i24g2000prf.googlegroups.com>
	<mailman.166.1234917814.11746.python-list@python.org>
	<702dm1FkrikgU1@mid.dfncis.de>
Message-ID: <1234993584.7867.22.camel@tim-laptop>

On Wed, 2009-02-18 at 13:36 +0100, Johannes Bauer wrote:
> Curt Hash schrieb:
> 
> > You just need to change your User-Agent so that Google doesn't know a
> > Python script is making the request:
> 
> Why would Google not send a response if the User-Agent header field is
> not a recognized browser? I doubt that's what's happening and the OP
> would just like the convenience of a search API instead of parsing the
> web page (like other applications do). Ugly, but it works.

I suspect that it's the other way around - Google has black-listed the
standard python user-agent rather than whitelisting useragents.

Think about how much power it takes to do a query on Google - if they
provided a search API they would lose out on advertising on the results
- which at the end of the day is their income-source.

It's a pain not to have a search API, but you've got to understand it!




From SiteContactUs at gmail.com  Wed Feb 18 16:49:36 2009
From: SiteContactUs at gmail.com (beetlecube)
Date: Wed, 18 Feb 2009 13:49:36 -0800 (PST)
Subject: Can't get the IPYthon ipapi object working
Message-ID: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>

Hi , I found out from a random google search that I could use IPython
to automatically import modules so that I could test Django views.

I downloaded it (WIN XP), installed it.  I'm able to import it, but I
just can't seem to get the object working.

The code:
-----------------------------------
try:
    import IPython.ipapi
    ip = IPython.ipapi.get()
    a = ip.options
    ip.ex('import os')

except Exception,msg:
    print "Message: ", msg
-------------------------------------------

I get: ' Message:  'NoneType' object has no attribute 'options' '

If I remove the ip.options statement, it will say the same thing about
attribute 'ex'

Does anyone know if there are configuration options necessary?

 I read the docs, and it described a profile module, but I just need
to run this, for this single purpose ( at least, now, later I can see
its usefulness definitely,)

Steve













From lionel.keene at gmail.com  Wed Feb 18 17:08:53 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 14:08:53 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
Message-ID: <5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com>

On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
> Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> post here and hope someone new the answer. I feel it's a silly
> problem, maybe something to do with a path variable? The problem: I've
> downloaded the "all-in-one" windows binary installer for PyGTK from
> their website. After typing in their first tutorial program and trying
> to run from the command line, I get:
>
> "This application has failed to start because libglib-2.0-0.dll was
> not found" error dialog.
>
> The traceback indicates this is happening at the "import gtk" line. A
> quick search of my install directory for PyGTK indicates that the file
> is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> Is there some some sort of path variable for Python I need to modify
> and, if so, how is this done? Thanks so much, and my apologies if this
> is the wrong forum.
>
> -L

Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
different traceback error:

"ImportError: no module named pygtk"

I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
Then I displaye the sys.path:

IDLE 1.2
>>> import sys
>>> sys.path
['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
\PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
\DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
\PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
\lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
\\Python\\lib\\site-packages']

Every single entry is related to PyGTK and nothing else. Something
seems wrong here but I don't have enough Python experience to know
just what. Anyone?


From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:16:41 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:16:41 -0000
Subject: Newbie Q about Turtle Gfx
Message-ID: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>

Hello

Sorry if this is not an appropriate newsgroup for this problem. I am very 
new to Python but not new to programming.

I am hoping to use Python to teach a class and have been looking at the 
online book 'Snake Wrangling for Kids'.

I have followed the example

>>>import turtle
>>>t=turtle.pen()

which works fine and displays a turtle in a window.

However whenever I try to use something like

>>>t.forward(50)   (taken from the book)

i get the error...

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    t.forward(50)
AttributeError: 'dict' object has no attribute 'forward'

I get the same error with t.left(10) etc. etc.

I have tried this with V2.6 and V3

Any ideas would be much appreciated.

Thanks
Neil





From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:18:04 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:18:04 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>

Forgot to say, that after the error message the turtle window 'hangs' as 
unresponsive ...

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very 
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the 
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
>>>>import turtle
>>>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
>>>>t.forward(50)   (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
>  File "<pyshell#3>", line 1, in <module>
>    t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil
>
>
> 




From shandy.b at gmail.com  Wed Feb 18 17:20:57 2009
From: shandy.b at gmail.com (sjbrown)
Date: Wed, 18 Feb 2009 14:20:57 -0800 (PST)
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <9ba48cb7-d32b-40ef-a6a6-d2250886379a@l33g2000pri.googlegroups.com>

It looks like there may be a bug if you were expecting t to be some
object other than a dict.  You can apparently contact the authour
here:

http://www.briggs.net.nz/log/contact/

On Feb 18, 2:16?pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) ? (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil



From tim.wintle at teamrubber.com  Wed Feb 18 17:21:50 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 18 Feb 2009 22:21:50 +0000
Subject: Revision Control
In-Reply-To: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
Message-ID: <1234995710.7867.61.camel@tim-laptop>

On Wed, 2009-02-18 at 09:08 -0800, Sam Clark wrote:
> Any suggestions for a beginer on what to use for version control?
> It's just me, the lone person programming.  I've already nailed one
> "version" of my code accidentaly.  MS VSS is too expensive for the
> stuff I'm doing, plus I really don't like MS much...  Any free open
> source stuff out there?

I use svn (subversion) at work and it works fine, but I'm using bazaar
<http://bazaar-vcs.org/> on my own code, and even alongside svn to help
with merging branches, porting code up-stream etc.

bazaar is really great in my experience, although relatively new so you
might prefer to stick to svn. I haven't tried using bazaar on windows.


If you do go with svn, try the latest version, since merging support is
much better in this.


Tim




From gtill60 at gmail.com  Wed Feb 18 17:22:59 2009
From: gtill60 at gmail.com (gtillmon)
Date: Wed, 18 Feb 2009 14:22:59 -0800 (PST)
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<gnh565$5fd$1@ger.gmane.org>
	<mailman.208.1234993181.11746.python-list@python.org>
Message-ID: <7d253b32-0a76-4a74-b524-6807322756e7@j35g2000yqh.googlegroups.com>

On Feb 18, 3:39?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 18 Feb 2009 12:15:25 -0200, Steve Holden <st... at holdenweb.com> ?
> escribi?:
>
> > gtillmon wrote:
> >> I would like to know how to display and store the path of each mondule
> >> that is called.
> > It's certainly possible to trace function calls, if that would help.
> > sys.settrace allows you to establish a function that gets called
>
> If the OP is only interested in import statements, perhaps the -v flag is ?
> enough:
>
> python -v script_name.py
>
> It prints a line (on stderr) for each module imported, stating its name ?
> and source file.
>
> --
> Gabriel Genellina

Thanks for the information.


From gtill60 at gmail.com  Wed Feb 18 17:23:15 2009
From: gtill60 at gmail.com (gtillmon)
Date: Wed, 18 Feb 2009 14:23:15 -0800 (PST)
Subject: Directory
References: <6d92ee1b-75ba-4ba8-8dc3-625966b17835@d32g2000yqe.googlegroups.com>
	<mailman.193.1234966544.11746.python-list@python.org>
Message-ID: <d30ad330-64bc-4690-b604-ad3711d7d5f7@o11g2000yql.googlegroups.com>

On Feb 18, 8:15?am, Steve Holden <st... at holdenweb.com> wrote:
> gtillmon wrote:
> > Hello. ?I am new to the Python language.
> > I would like to know how to display and store the path of each mondule
> > that is called.
>
> Modules are imported, not called.
>
> > Similar to the old READY TRACE in COBOL of long ago.
>
> It's certainly possible to trace function calls, if that would help.
> sys.settrace allows you to establish a function that gets called
> whenever a Python function call is executed. The documentation is a
> little sparse, but you can find a rough example under "Crude Python
> Debugging" in
>
> ?http://www.st.ewi.tudelft.nl/~mol/snippets.php
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/


Thanks for the information.


From steve at holdenweb.com  Wed Feb 18 17:24:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 17:24:20 -0500
Subject: Delete lines which contain string in a file
In-Reply-To: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>
References: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com>
Message-ID: <gni1qt$m0h$1@ger.gmane.org>

Rudi Goldman wrote:
> Hi,
> Go easy on me as I am a new to Python and am trying to solve a practical
> problem that is driving me bananas.
> Basically I have 2 text files, a source and a target. I want to be able
> to delete all of the lines in the target file which contain text from
> any line in the source file.
> i.e.
> Source:                                     Target:
> 111                                           xxx 111 yyy   
> 222                                           xxx  333 sss 
> 333                                           jjj   444 sss
> 
> After executing this code the target file should only consist of the
> line:     jjj   444 sss
> Any help on this one would be greatly appreciated.
> 
Is this homework?

How far have you got with your design?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 17:28:36 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Wed, 18 Feb 2009 22:28:36 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<9ba48cb7-d32b-40ef-a6a6-d2250886379a@l33g2000pri.googlegroups.com>
Message-ID: <fpmdnQqyjasDFgHUnZ2dnUVZ8oaWnZ2d@bt.com>

Thanks for the very speedy reply!

Not sure what your reply means but I have emailed the author with the 
problem!

Cheers

Neil

"sjbrown" <shandy.b at gmail.com> wrote in message 
news:9ba48cb7-d32b-40ef-a6a6-d2250886379a at l33g2000pri.googlegroups.com...
It looks like there may be a bug if you were expecting t to be some
object other than a dict.  You can apparently contact the authour
here:

http://www.briggs.net.nz/log/contact/

On Feb 18, 2:16 pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
> File "<pyshell#3>", line 1, in <module>
> t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil




From http  Wed Feb 18 17:29:06 2009
From: http (Paul Rubin)
Date: 18 Feb 2009 14:29:06 -0800
Subject: number theory libraries / project euler
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <7xljs3751p.fsf@ruckus.brouhaha.com>

eliben <eliben at gmail.com> writes:
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.

The idea of Project Euler is you are supposed to find clever enough
methods to solve the problems that speed of the software libs is NOT
important.  


From catphive at catphive.net  Wed Feb 18 17:31:16 2009
From: catphive at catphive.net (Brendan Miller)
Date: Wed, 18 Feb 2009 14:31:16 -0800
Subject: PyYaml in standard library?
In-Reply-To: <50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
	<50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
Message-ID: <ef38762f0902181431i2d3309efu1c84236b46420906@mail.gmail.com>

On Wed, Feb 18, 2009 at 1:34 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Wed, Feb 18, 2009 at 1:11 AM, Brendan Miller <catphive at catphive.net> wrote:
>> I'm just curious whether PyYaml is likely to end up in the standard
>> library at some point?
>
> I don't personally have a direct answer to your question, but I can
> point out that JSON and YAML are mostly compatible (JSON is almost a
> perfect YAML subset) and the `json` module is already in the Python
> std lib.
>
> Cheers,
> Chris

Yes, JSON is an (I think unintentional) subset of YAML... but a fairly
small subset.

A list in YAML looks like

--- # my list
- Elem 1
- Elem 2

Whereas in JSON you have ["Elem 1", "Elem 2"]. People say JSON is a
subset because YAML will also accept the JSON style syntax if you want
to do something inline for convenience:

--- # my list containing a sublist in the second element.
- Elem 1
- ["Sub elem 1", "Sub elem 2"]

But this is really a special purpose syntax in the context of YAML.

I think the json module sticks everything on the same line, which
isn't readable for large data structures. My impression is YAML is
that is is more readable than JSON, whereas JSON is mostly for browser
interop.


From mensanator at aol.com  Wed Feb 18 17:36:21 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 18 Feb 2009 14:36:21 -0800 (PST)
Subject: number theory libraries / project euler
References: <fecf609e-8597-45c3-8bf2-cf6ec3b4b4be@f20g2000yqg.googlegroups.com>
Message-ID: <a0863380-eebd-43d9-8dd1-b9db1291966f@w39g2000prb.googlegroups.com>

On Feb 18, 2:18?pm, eliben <eli... at gmail.com> wrote:
> Hello,
>
> What are some good & recommended number theory libs for Python (or
> accessible interfaces to C libs), for things like primes,
> factorization, etc. Naturally, speed is of utmost importance here.
>
> In other words, which Python libraries and tools to you use to help
> you solve Project Euler problems :-) ?
>
> Eli

Also check out the gmpy library, lots of good number theory stuff
like factorial, gcd, lcm, linear congruence, is_prime, next_prime,
(I even found a use for the legendre function), etc.

(no factorization, I have Python call the MIRACL factor program when
I need that)

gmpy is so vital to my work that if they ever stop supporting it,
I will abandon Python.


From jeff.dyke at gmail.com  Wed Feb 18 17:44:03 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Wed, 18 Feb 2009 17:44:03 -0500
Subject: SVN/CVS and Branching
Message-ID: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>

Hello.  I am curious about different ideas on how you handle branching
your python projects.  With some other languages this is trivial, but
since python uses these directories as modules and i have the top
level module starting imports all over the place, i am wondering what
others do.  In the past we had retired the first branch and just moved
towards the new, but that is not possible now.

Thanks,
jd


From aisaac at american.edu  Wed Feb 18 17:48:17 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 18 Feb 2009 17:48:17 -0500
Subject: get descriptor from instance
Message-ID: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>

What is a reliable way to get the
the property object for an instance attribute?
(Or more generally, to get the descriptor
controlling an attribute?)

If class ``A`` defines the property ``x`` and ``a``
in an instance of ``A``, then you can just use
``type(a).__dict__['x']`` to get the property object.
But this will not work if the property is inherited.

Thanks,
Alan Isaac


From Scott.Daniels at Acm.Org  Wed Feb 18 17:57:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 14:57:32 -0800
Subject: Newbie Q about Turtle Gfx
In-Reply-To: <FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<FJ6dncvkof-4FAHUnZ2dneKdnZydnZ2d@bt.com>
Message-ID: <xYSdnatH2OJTDAHUnZ2dnUVZ_j6WnZ2d@pdx.net>

Neil wrote:
> Forgot to say, that after the error message the turtle window 'hangs' as 
> unresponsive ...
> 
> "Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
> news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
>> Hello
>> I am hoping to use Python to teach a class and have been looking at the 
>> online book 'Snake Wrangling for Kids'.
>>
>> I have followed the example
>>>>> import turtle
>>>>> t=turtle.pen()
>> which works fine and displays a turtle in a window.
>>
>> However whenever I try to use something like
>>>>> t.forward(50)   (taken from the book)
>> i get the error...
>>
>> Traceback (most recent call last):
>>  File "<pyshell#3>", line 1, in <module>
>>    t.forward(50)
>> AttributeError: 'dict' object has no attribute 'forward'


Well, if you
 >>> print(turtle.__doc__)
You'll see that this is a re-implemetation, so expect a few hiccups.

I see, from the following:
 >>> import turtle
 >>> t = turtle.pen()
 >>> print(repr(t))

The pen returned (which you named t) is a simple dictionary.
You can, however, follow up with:
 >>> turtle.forward(23)
 >>> turtle.right(90)
 >>> turtle.forward(32)
 >>> turtle.right(90)
 >>> turtle.forward(23)
 >>> turtle.right(90)
 >>> turtle.forward(32)


Or, if you prefer, you can go:

 >>> t = turtle.Turtle()
 >>> t.forward(30)
 >>> t.left(120)

--Scott David Daniels
Scott.Daniels at Acm.Org


From lionel.keene at gmail.com  Wed Feb 18 18:03:56 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 15:03:56 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com>
Message-ID: <8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com>

On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > post here and hope someone new the answer. I feel it's a silly
> > problem, maybe something to do with a path variable? The problem: I've
> > downloaded the "all-in-one" windows binary installer for PyGTK from
> > their website. After typing in their first tutorial program and trying
> > to run from the command line, I get:
>
> > "This application has failed to start because libglib-2.0-0.dll was
> > not found" error dialog.
>
> > The traceback indicates this is happening at the "import gtk" line. A
> > quick search of my install directory for PyGTK indicates that the file
> > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > Is there some some sort of path variable for Python I need to modify
> > and, if so, how is this done? Thanks so much, and my apologies if this
> > is the wrong forum.
>
> > -L
>
> Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> different traceback error:
>
> "ImportError: no module named pygtk"
>
> I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> Then I displaye the sys.path:
>
> IDLE 1.2>>> import sys
> >>> sys.path
>
> ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> \\Python\\lib\\site-packages']
>
> Every single entry is related to PyGTK and nothing else. Something
> seems wrong here but I don't have enough Python experience to know
> just what. Anyone?- Hide quoted text -
>
> - Show quoted text -

Okay, out of desperation and frustration I've wiped my Python/SciPy/
etc.. setup and reinstalled from scratch. I've tested it with my app
and all the numpy and matplotlib functionality is there and working.
My sys.path seems to be back to normal:

IDLE 1.2.4
>>> import sys
>>> sys.path
['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
\site-packages']

I will now re-install PyGTK and see if it mysteriously decides to work
this time.


From superprad at gmail.com  Wed Feb 18 18:08:55 2009
From: superprad at gmail.com (PK)
Date: Wed, 18 Feb 2009 18:08:55 -0500
Subject: fcntl.fcntl breaking on 64bit
Message-ID: <5b0681910902181508s7ce57487idd0bc21a350f7f56@mail.gmail.com>

Hello Friends:

I'm running into issues with using fcntl on a 64 bit servers.

Python version: 2.4.3

system Arch: # uname -m
x86_64


code keeps erroring out with:

fcntl.fcntl(fd, rhn_fcntl.F_SETLKW, UNLOCK)
IOError: [Errno 22] Invalid argument

The same python code block runs fine on a i386/686.

Does anyone have any thoughts? Is this a known issue? any workarounds?

Any suggestions appreciated.

Thanks,
~ PK
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From lionel.keene at gmail.com  Wed Feb 18 18:12:32 2009
From: lionel.keene at gmail.com (Lionel)
Date: Wed, 18 Feb 2009 15:12:32 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com> 
	<8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com>
Message-ID: <1198ef28-b2c0-4464-85ad-31798dc0c33f@r15g2000prh.googlegroups.com>

On Feb 18, 3:03?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > > post here and hope someone new the answer. I feel it's a silly
> > > problem, maybe something to do with a path variable? The problem: I've
> > > downloaded the "all-in-one" windows binary installer for PyGTK from
> > > their website. After typing in their first tutorial program and trying
> > > to run from the command line, I get:
>
> > > "This application has failed to start because libglib-2.0-0.dll was
> > > not found" error dialog.
>
> > > The traceback indicates this is happening at the "import gtk" line. A
> > > quick search of my install directory for PyGTK indicates that the file
> > > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > > Is there some some sort of path variable for Python I need to modify
> > > and, if so, how is this done? Thanks so much, and my apologies if this
> > > is the wrong forum.
>
> > > -L
>
> > Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> > different traceback error:
>
> > "ImportError: no module named pygtk"
>
> > I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> > Then I displaye the sys.path:
>
> > IDLE 1.2>>> import sys
> > >>> sys.path
>
> > ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> > \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> > \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> > \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> > \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> > \\Python\\lib\\site-packages']
>
> > Every single entry is related to PyGTK and nothing else. Something
> > seems wrong here but I don't have enough Python experience to know
> > just what. Anyone?- Hide quoted text -
>
> > - Show quoted text -
>
> Okay, out of desperation and frustration I've wiped my Python/SciPy/
> etc.. setup and reinstalled from scratch. I've tested it with my app
> and all the numpy and matplotlib functionality is there and working.
> My sys.path seems to be back to normal:
>
> IDLE 1.2.4>>> import sys
> >>> sys.path
>
> ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> \site-packages']
>
> I will now re-install PyGTK and see if it mysteriously decides to work
> this time.- Hide quoted text -
>
> - Show quoted text -

Nope. Now I'm getting:

"The applciation has failed to start because MSVCR80.dll was not
found."

Don't know what else to try here. Anyone have any ideas?


From robert.kern at gmail.com  Wed Feb 18 18:12:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 18 Feb 2009 17:12:41 -0600
Subject: Can't get the IPYthon ipapi object working
In-Reply-To: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
References: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
Message-ID: <gni4la$v39$1@ger.gmane.org>

On 2009-02-18 15:49, beetlecube wrote:
> Hi , I found out from a random google search that I could use IPython
> to automatically import modules so that I could test Django views.
>
> I downloaded it (WIN XP), installed it.  I'm able to import it, but I
> just can't seem to get the object working.
>
> The code:
> -----------------------------------
> try:
>      import IPython.ipapi
>      ip = IPython.ipapi.get()
>      a = ip.options
>      ip.ex('import os')
>
> except Exception,msg:
>      print "Message: ", msg
> -------------------------------------------
>
> I get: ' Message:  'NoneType' object has no attribute 'options' '
>
> If I remove the ip.options statement, it will say the same thing about
> attribute 'ex'

This needs to be run in the context of a running instance IPython, not just any 
other module. That kind of code is usually put into your c:\Documents and 
Settings\username\_ipython\ipy_user_conf.py file.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From gagsl-py2 at yahoo.com.ar  Wed Feb 18 18:15:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 18 Feb 2009 21:15:10 -0200
Subject: get descriptor from instance
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
Message-ID: <op.upkljkimx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 20:48:17 -0200, Alan G Isaac <aisaac at american.edu>  
escribi?:

> What is a reliable way to get the
> the property object for an instance attribute?
> (Or more generally, to get the descriptor
> controlling an attribute?)
>
> If class ``A`` defines the property ``x`` and ``a``
> in an instance of ``A``, then you can just use
> ``type(a).__dict__['x']`` to get the property object.
> But this will not work if the property is inherited.

type(a).x

py> class A(object):
...   def getx(self): return 1
...   x = property(getx)
...
py> class B(A):
...   pass
...
py> b=B()
py> b.x
1
py> B.x
<property object at 0x00B8A690>
py> type(b).x
<property object at 0x00B8A690>
py> getattr(type(b),'x')
<property object at 0x00B8A690>
py>

-- 
Gabriel Genellina



From mensanator at aol.com  Wed Feb 18 18:43:29 2009
From: mensanator at aol.com (Mensanator)
Date: Wed, 18 Feb 2009 15:43:29 -0800 (PST)
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <f52959c2-45ba-4eff-83df-6ba191cd29bd@b38g2000prf.googlegroups.com>

On Feb 18, 4:16?pm, "Neil" <rubik_wiz... at NO.SPAMhotmail.com> wrote:
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
> >>>import turtle
> >>>t=turtle.pen()

You defined "t" to be a pen object, not a turtle object.

>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
> >>>t.forward(50) ? (taken from the book)

Pens don't move, turtles move (and the pen the turtle is
carrying draws a line, if down).

>
> i get the error...
>
> Traceback (most recent call last):
> ? File "<pyshell#3>", line 1, in <module>
> ? ? t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.

Pens can't turn left, turtles turn left.

>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil

Here's an example. It draws a Minimal Spanning Tree.

If you don't need an MST, take note of how I use the turtle.

import turtle
import random
import copy

def build_sv(start,stop,limit,C):
  """Sequence Vector Generator

  build_sv(start,stop,limit,C)
  start: start of Collatz sequence (must be odd)
  stop:  sequence termination
  limit: max length of [sv] if stop not found
       limit is sum(sv), not len(sv)
  C:     C of 3n+C
  returns [] if invalid
  returns SequenceVector [sv]
  """
  ONE = 1
  TWO = 2
  TWE = 3

  sv = []
  if (start % 2)==0: return sv
  done = 0
  count = 0
  while done==0:
    #
    # oops, power division may skip past stopping point
    # without seeing it
    #
    start = TWE*start + C
    f = 0
    t = start
    while t%2==0:
      f += 1
      t /= 2
    g = 0                      # stopping point may occur before f is
reached
    while (not done) and g<f:
      start = start >> 1
      if start==stop: done = 1
      count += 1
      g += 1
      if count==limit: done = 1
    sv.append(g)
  return sv

def Type12MH(k,i):
  """Find ith, kth Generation Type [1,2] Mersenne Hailstone using the
closed form equation

  Type12MH(k,i)
  k: generation
  i: member of generation
  returns Hailstone (a)
  """
  ONE = 1
  TWO = 2
  SIX = 6
  NIN = 9

  if (k<1) or (i<1): return 0

  a = (i-ONE)*NIN**(k-ONE) + (NIN**(k-ONE) - ONE)/TWO + ONE
  return TWO**(SIX*a - ONE) - ONE



turtle.clear()
turtle.up()

the_window = (turtle.window_width(),turtle.window_height())
print the_window,
turtle.goto(0,0)
tooter = turtle.position()
buffer_L = -((the_window[0]-200)/2)
buffer_R = (the_window[0]-200)/2
buffer_T = (the_window[1]-200)/2
buffer_B = -((the_window[1]-200)/2)
print buffer_L,buffer_R,buffer_T,buffer_B

turtle.tracer(False)
turtle.down()
turtle.speed('fastest')
t = 0
turtle.setheading(t)

for j in range(1):
  p = Type12MH(4,2)  # Type12 Mersenne Hailstone (very big)
  sv = build_sv(p,1,10000000,1) # limit to 10 million numbers in
vector


# Minimal Spanning Tree
  stars = []
  turtle.up()
  for d in sv:                         # random turtle crawl based on
sv
    if d>1:                          # skip small sv values for
movement
      for r in xrange(1):
        turtle.setheading(t+r*90)
        turtle.forward(d*4)      # scale of grid
      tooter = turtle.position()
      if d>8:                      # create a star at really large sv
values
        turtle.down()
        turtle.width(3)
        turtle.color('black')
        turtle.forward(1)        # draw a blob
        turtle.backward(1)
        stars.append((int(tooter[0]),int(tooter[1])))
        turtle.up()
        turtle.width(1)
        turtle.color('red')      # color of MST spans
      whither_tooter = []          # build list of legal next turns
      if tooter[0]>buffer_L:       # test for being too close to
screen edge
        whither_tooter.append(180)
      if tooter[0]<buffer_R:
        whither_tooter.append(0)
      if tooter[1]<buffer_T:
        whither_tooter.append(90)
      if tooter[1]>buffer_B:
        whither_tooter.append(270)
      t = random.choice(whither_tooter) # choose random direction from
list of legal moves
  print 'stars:',len(stars)

  star_dist = []                      # create list of spans between
stars
  for i,src in enumerate(stars):
    for j,dst in enumerate(stars):
      dist = turtle.sqrt((src[0]-dst[0])**2 + (src[1]-dst[1])**2)
      if dist == 0:
        star_dist.append([9999,i,j])
      else:
        star_dist.append([dist,i,j])

  star_dist.sort()

  MST = []                            # spans of MST
  MST2 = []                           # only those spans that can
connect to existing MST
  points_used = {}                    # list of stars that are
currently on MST

  s = copy.deepcopy(star_dist[0])     # going to modify list element,
so deep copy needed
  MST.append(s)                       # fist span always smallest
absolute distance
  points_used[s[1]] = 1
  points_used[s[2]] = 1
  star_dist[0][0] = 9999              # overwrite distance so this
span can't be used again
  found = False                       # also, overwrite complement
span
  si = 0
  while not found:
    ss = star_dist[si]
    if s[1]==ss[2] and s[2]==ss[1]: # the complement
      star_dist[si][0] = 9999
      found = True
    else:
      si += 1
  while len(MST)<(len(stars)-1):        # an MST of n points always
has n-1 spans
    for i,sd in enumerate(star_dist): # copy points matching s to MST2
      # only spans that could connect to existing
      # tree points can be added at this stage
      # (only have to check for last added to MST)
      if (sd[0]!=9999) and  \
         ((sd[1]==s[1]) or  \
        (sd[1]==s[2]) or  \
        (sd[2]==s[1]) or  \
        (sd[2]==s[2])):
        MST2.append(copy.deepcopy(sd))
        star_dist[i][0] = 9999    # once copied to MST2, overwrite
original distance
    MST2.sort()
    close = 0
    #
    # can't use a span if BOTH points already on MST, otherwise we get
loops
    # and some stars remain disjoint
    #
    while ((MST2[close][1] in points_used) and (MST2[close][2] in
points_used)):
      close += 1
    s = copy.deepcopy(MST2[close])
    MST.append(s)
    if s[1] in points_used:           # only keys used to create tree,
values
      points_used[s[1]] += 1        # will eventully be number of
points
    else:                             # connected to this point
      points_used[s[1]] = 1
    if s[2] in points_used:
      points_used[s[2]] += 1
    else:
      points_used[s[2]] = 1
    MST2[close][0] = 9999             # overwrite this point and its
complement
    found = False
    si = 0
    while not found:
      ss = MST2[si]
      if s[1]==ss[2] and s[2]==ss[1]: # the duplicate
        MST2[si][0] = 9999
        found = True
      else:
        si += 1
        if si == len(MST2): found = True

  for span in MST:               # from an MST span
    srcx = stars[span[1]][0]   # get coords of two endpoints
    srcy = stars[span[1]][1]
    dstx = stars[span[2]][0]
    dsty = stars[span[2]][1]
    turtle.up()                # and draw a line between them
    turtle.goto(srcx,srcy)
    turtle.down()
    turtle.goto(dstx,dsty)





From sturlamolden at yahoo.no  Wed Feb 18 19:23:32 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 16:23:32 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
Message-ID: <77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com>

On 18 Feb, 00:08, Lionel <lionel.ke... at gmail.com> wrote:

> 1) What is "recarray"?

An ndarray of what C programmers know as a "struct", in which each
field is accessible by its name.

That is,

struct rgba{
  unsigned char r;
  unsigned char g;
  unsigned char b;
  unsigned char a;
};

struct rgba arr[480][640];

is similar to:

import numpy as np
rbga = np.dtype({'names':list('rgba'), 'formats':[np.uint8]*4})
arr = np.array((480,640), dtype=rgba)

Now you can access the r, g, b and a fields directly using arr['r'],
arr['g'], arr['b'], and arr['a'].
Internally the data will be represented compactly as with the C code
above. If you want to view the data as an 480 x 640 array of 32 bit
integers instead, it is as simple as arr.view(dtype=np.uint32).
Formatted binary data can of course be read from files using
np.fromfile with the specified dtype, and written to files by passing
a recarray as buffer to file.write. You can thus see NumPy's
recarray's as a more powerful alternative to Python's struct module.


> I don't really see in the diocumentation how portions are loaded, however.

Prior to Python 2.6, the mmap object (which numpy.memmap uses
internally) does not take an offset parameter. But when NumPy are
ported to newer version of Python this will be fixed. You should then
be able to memory map with an ndarray from a certain offset. To make
this work now, you must e.g. backport mmap from Python 2.6 and use
that with NumPy. Not difficult, but nobody has bothered to do it (as
far as I know).



Sturla Molden


From rubik_wizard at NO.SPAMhotmail.com  Wed Feb 18 19:26:48 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Thu, 19 Feb 2009 00:26:48 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
Message-ID: <jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d@bt.com>

Thanks everyone!

It appears the info in the book is wrong. Trying what you have all suggested
has got it to work!

Many thanks, and I am sure I will be back here again with other newbie
problems!

Neil

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
> Hello
>
> Sorry if this is not an appropriate newsgroup for this problem. I am very 
> new to Python but not new to programming.
>
> I am hoping to use Python to teach a class and have been looking at the 
> online book 'Snake Wrangling for Kids'.
>
> I have followed the example
>
>>>>import turtle
>>>>t=turtle.pen()
>
> which works fine and displays a turtle in a window.
>
> However whenever I try to use something like
>
>>>>t.forward(50)   (taken from the book)
>
> i get the error...
>
> Traceback (most recent call last):
>  File "<pyshell#3>", line 1, in <module>
>    t.forward(50)
> AttributeError: 'dict' object has no attribute 'forward'
>
> I get the same error with t.left(10) etc. etc.
>
> I have tried this with V2.6 and V3
>
> Any ideas would be much appreciated.
>
> Thanks
> Neil
>
>
> 




From SiteContactUs at gmail.com  Wed Feb 18 19:29:09 2009
From: SiteContactUs at gmail.com (beetlecube)
Date: Wed, 18 Feb 2009 16:29:09 -0800 (PST)
Subject: Can't get the IPYthon ipapi object working
References: <64e1c5b4-efda-4a52-9b99-05762cb2bef5@t39g2000prh.googlegroups.com>
	<mailman.216.1234998776.11746.python-list@python.org>
Message-ID: <57ecb5ae-3348-40bd-8b32-51c33e706635@x29g2000prf.googlegroups.com>

On Feb 18, 3:12?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2009-02-18 15:49, beetlecube wrote:
>
>
>
> > Hi , I found out from a random google search that I could use IPython
> > to automatically import modules so that I could test Django views.
>
> > I downloaded it (WIN XP), installed it. ?I'm able to import it, but I
> > just can't seem to get the object working.
>
> > The code:
> > -----------------------------------
> > try:
> > ? ? ?import IPython.ipapi
> > ? ? ?ip = IPython.ipapi.get()
> > ? ? ?a = ip.options
> > ? ? ?ip.ex('import os')
>
> > except Exception,msg:
> > ? ? ?print "Message: ", msg
> > -------------------------------------------
>
> > I get: ' Message: ?'NoneType' object has no attribute 'options' '
>
Shoulda know I was doing something fundamentally wrong.
Thanks a lot!
> > If I remove the ip.options statement, it will say the same thing about
> > attribute 'ex'
>
> This needs to be run in the context of a running instance IPython, not just any
> other module. That kind of code is usually put into your c:\Documents and
> Settings\username\_ipython\ipy_user_conf.py file.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco



From bhood37 at hotmail.com  Wed Feb 18 19:33:14 2009
From: bhood37 at hotmail.com (Uberman)
Date: Wed, 18 Feb 2009 17:33:14 -0700
Subject: Calling a class instance like a function
Message-ID: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>

I'm wondering if there's a way to invoke a "function" operator on a Python
class instance.  For example, given a class instance:

	myClass = MyClass()

I want to call that instance like a function, with an argument value:

	myClass(5.0)

I can override the "()" operator in C++, so I'm wondering if there's a way to
do it in Python as well.

Thanks!


From gert.cuykens at gmail.com  Wed Feb 18 19:33:31 2009
From: gert.cuykens at gmail.com (gert)
Date: Wed, 18 Feb 2009 16:33:31 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<mailman.177.1234942519.11746.python-list@python.org>
Message-ID: <90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>

On Feb 18, 8:25?am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
> "gert" <gert.cuyk... at gmail.com>wrote:
>
> > After reading the docs and seeing a few examples i think this should
> > work ?
> > Am I forgetting something here or am I doing something stupid ?
> > Anyway I see my yellow screen, that has to count for something :)
>
> > from tkinter import *
> > from threading import Thread
>
> > class Weegbrug(Thread):
> > ? ? def __init__(self,v):
> > ? ? ? ? self.v=v
> > ? ? ? ? Thread.__init__(self)
> > ? ? def run(self):
> > ? ? ? ? while True:
> > ? ? ? ? ? ? with open('com1','r') as f:
> > ? ? ? ? ? ? ? ? ?for line in f:
> > ? ? ? ? ? ? ? ? ? ? ?self.v.set(line[2:-1])
>
> It is in general not a good idea to directly
> access GUI variables from outside the
> GUI main loop.
> There is a recipe for doing this sort of thing,
> but as usual I have lost the reference.
> What it does is that instead of interfering directly
> as above, you put the data on a queue.
>
> Then, you use the after() call to set up a call
> to a routine that reads the queue, and configures the
> display, and then uses after again to call itself again
> after a time, thereby keeping the GUI stuff in the GUI
> mainloop.
>

from tkinter import *
from threading import Thread

class Weegbrug(Thread):
    def __init__(self):
        self.display='00000'
        Thread.__init__(self)
    def run(self):
        x=0
        while True:
            x=x+1
            self.display=x
            #with open('com1','r') as f:
            #     for l in f:
            #         self.display=l[2:-1]

root = Tk()
v = StringVar()
v.set('00000')
w = Weegbrug()
w.start()
tx = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
tx.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, v.set(w.display))
root.mainloop()

Why does this not work ?
It only shows one result ?


From pofuk at email.t-com.hr  Wed Feb 18 19:38:45 2009
From: pofuk at email.t-com.hr (SMALLp)
Date: Thu, 19 Feb 2009 01:38:45 +0100
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
	<87ocwzzvym.fsf@mulj.homelinux.net>
Message-ID: <gni9mm$bv0$1@ss408.t-com.hr>

Thanks for help!

My problem was actualy:
>>> a = ["velja\xe8a 2009"]
>>> print a    #will print
["velja\xe8a 2009"]
>>> Print a[0]    #will print
velja?a 2009

"Hrvoje Niksic" <hniksic at xemacs.org> wrote in message 
news:87ocwzzvym.fsf at mulj.homelinux.net...
> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:
>
>>> I'm playing with os.popen function.
>>> a = os.popen("somecmd").read()
>>>
>>> If one of the lines contains characters like "e", "a"or any other it 
>>> loks
>>> line this "velja\xe8a 2009" with that "\xe8". It prints fine if i go:
>>>
>>> for i in a:
>>>     print i:
>>
>> '\xe8' is a *single* byte (not four). It is the 'LATIN SMALL LETTER E
>> WITH  GRAVE' Unicode code point u'e' encoded in the Windows-1252
>> encoding (and  latin-1, and others too).
>
> Note that it is also 'LATIN SMALL LETTER C WITH CARON' (U+010D or
> u'?'), encoded in Windows-1250, which is what the OP is likely using.
>
> The rest of your message stands regardless: there is no problem, at
> least as long as the OP only prints out the character received from
> somecmd to something else that also expects Windows-1250.  The problem
> would arise if the OP wanted to store the string in a PyGTK label
> (which expects UTF8) or send it to a web browser (which expects
> explicit encoding, probably defaulting to UTF8), in which case he'd
> have to disambiguate whether '\xe8' refers to U+010D or to U+00E8 or
> something else entirely.
>
> That is the problem that Python 3 solves by requiring (or strongly
> suggesting) that such disambiguation be performed as early in the
> program as possible, preferrably while the characters are being read
> from the outside source.  A similar approach is possible using Python
> 2 and its unicode type, but since the OP never specified exactly which
> problem he had (except for the repr/str confusion), it's hard to tell
> if using the unicode type would help. 




From andrew at acooke.org  Wed Feb 18 19:40:33 2009
From: andrew at acooke.org (andrew cooke)
Date: Wed, 18 Feb 2009 21:40:33 -0300 (CLST)
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
Message-ID: <a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>


maybe this is just me, but i don't have a clue what your problem is.  what
does "starting imports all over the place" mean?  what do you mean by
"retired"?

i use svn with python in exactly the same way as with java (and, i
thought, in the same way as anyone uses svn with any language; java uses
the directory structure as a package structure too).

maybe someone else will reply, but if not it might help to explain a
little more detail.

andrew


Jeff Dyke wrote:
> Hello.  I am curious about different ideas on how you handle branching
> your python projects.  With some other languages this is trivial, but
> since python uses these directories as modules and i have the top
> level module starting imports all over the place, i am wondering what
> others do.  In the past we had retired the first branch and just moved
> towards the new, but that is not possible now.




From gruszczy at gmail.com  Wed Feb 18 19:42:57 2009
From: gruszczy at gmail.com (=?UTF-8?Q?Filip_Gruszczy=C5=84ski?=)
Date: Thu, 19 Feb 2009 01:42:57 +0100
Subject: Calling a class instance like a function
In-Reply-To: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
Message-ID: <1be78d220902181642q4cbb1682rf27948eccf311271@mail.gmail.com>

__call__

2009/2/19 Uberman <bhood37 at hotmail.com>:
> I'm wondering if there's a way to invoke a "function" operator on a Python
> class instance.  For example, given a class instance:
>
>        myClass = MyClass()
>
> I want to call that instance like a function, with an argument value:
>
>        myClass(5.0)
>
> I can override the "()" operator in C++, so I'm wondering if there's a way to
> do it in Python as well.
>
> Thanks!
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Filip Gruszczy?ski


From sturlamolden at yahoo.no  Wed Feb 18 19:50:58 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 16:50:58 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com> 
	<mailman.9205.1234248235.3487.python-list@python.org>
	<d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>
Message-ID: <64c334d7-434f-4ec3-8ccb-35e8088a0cb2@u13g2000yqg.googlegroups.com>

On Feb 10, 8:38?am, Paul McGuire <pt... at austin.rr.com> wrote:

> Even worse than linear, the function is recursive, which as I
> understand it, is inherently a no-no when looking for code that is
> parallel-friendly.

There is no way to parallelize Fibonacci numbers computed with linear
time complexity, as we must know fib(n-1) to compute fib(n). But if we
were to use Oyster's recursive version, which has geometric
complexity, one could parallelize with a 'forkjoin' scheme.

Anyhow, this runs in amortized linear time and would be a lot faster:

def fib(n):
   while True:
      try:
         return fib.seq[n]
      except AttributeError:
         fib.seq = [0, 1, 1]
      except IndexError:
         fib.seq.append( fib.seq[-2] +
                          fib.seq[-1] )

S.M.


From Scott.Daniels at Acm.Org  Wed Feb 18 20:02:55 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 18 Feb 2009 17:02:55 -0800
Subject: Threading and tkinter
In-Reply-To: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
Message-ID: <F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>

gert wrote:
> After reading the docs and seeing a few examples i think this should
> work ?
> Am I forgetting something here or am I doing something stupid ?
> Anyway I see my yellow screen, that has to count for something :)
> 
Try this:
# tdh_show.py
from __future__ import with_statement

import time
import Tkinter
import Tkconstants as TK
import threading

class Weegbrug(threading.Thread):
     def __init__(self, frame, var, filename):
         self.frame = frame
         self.var = var
         self.filename = filename
         threading.Thread.__init__(self)

     def run(self):
         with open(self.filename, 'r') as f:
             for n, line in enumerate(f):
                 # the tricky bit:
                 self.frame.after(100, self.var.set, line.strip())
                 time.sleep(.5)


def main(filename):
     root = Tkinter.Tk()
     svar = Tkinter.StringVar(root)
     frame = Tkinter.Frame(root, relief=TK.RIDGE, borderwidth=2)
     frame.pack(fill=TK.BOTH, expand=1)
     label = Tkinter.Label(frame, textvar=svar, bg='yellow',
                           font=('Helvetica', 16))
     label.pack(fill=TK.X, expand=1)
     button = Tkinter.Button(frame, text="Exit", command=root.destroy)
     button.pack(side=TK.BOTTOM)
     reader = Weegbrug(frame, svar, filename)
     button = Tkinter.Button(frame, text="Go", command=reader.start)
     button.pack(side=TK.BOTTOM)
     root.mainloop()


if __name__ == '__main__':
     main(__file__)


--Scott David Daniels
Scott.Daniels at Acm.Org


From http  Wed Feb 18 20:31:58 2009
From: http (Paul Rubin)
Date: 18 Feb 2009 17:31:58 -0800
Subject: PyYaml in standard library?
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
	<50697b2c0902180134gcb053w96002899356d3ad1@mail.gmail.com>
	<mailman.213.1234996769.11746.python-list@python.org>
Message-ID: <7x63j72ovl.fsf@ruckus.brouhaha.com>

Brendan Miller <catphive at catphive.net> writes:
> I think the json module sticks everything on the same line, which
> isn't readable for large data structures.

It has a prettyprint option.


From bhood37 at hotmail.com  Wed Feb 18 20:32:11 2009
From: bhood37 at hotmail.com (Uberman)
Date: Wed, 18 Feb 2009 18:32:11 -0700
Subject: Calling a class instance like a function
In-Reply-To: <mailman.219.1235004180.11746.python-list@python.org>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
	<mailman.219.1235004180.11746.python-list@python.org>
Message-ID: <yE2nl.200422$zQ4.71364@en-nntp-02.dc1.easynews.com>

Thank you very much, Filip!!  :)

Filip Gruszczy?ski wrote:
> __call__
> 
> 2009/2/19 Uberman <bhood37 at hotmail.com>:
>> I'm wondering if there's a way to invoke a "function" operator on a Python
>> class instance.  For example, given a class instance:
>>
>>        myClass = MyClass()
>>
>> I want to call that instance like a function, with an argument value:
>>
>>        myClass(5.0)
>>
>> I can override the "()" operator in C++, so I'm wondering if there's a way to
>> do it in Python as well.
>>
>> Thanks!
>> --
>> http://mail.python.org/mailman/listinfo/python-list


From cokofreedom at gmail.com  Wed Feb 18 20:35:16 2009
From: cokofreedom at gmail.com (cokofreedom at gmail.com)
Date: Wed, 18 Feb 2009 17:35:16 -0800 (PST)
Subject: Timeit
Message-ID: <95457df7-57ac-4d5c-b68d-2bd804ae3c90@x38g2000yqj.googlegroups.com>

I've having an annoying problem at the moment. I'm writing code for
the travelling salesmen problem and comparing different techniques.
But I've having a problem using timeit.

I have a file called "testplatform.py" that contains 4 class:
Test() - which is called first to create the cities/routes to be
shared between the other classes
AutoClone() - which uses the variables from Test() (normally test =
Test())
Randomisation() - Ditto
BruteForce() - Ditto

if __name__ == '__main__':
....test = Test(5, 1000, 100, 100, 100, 14)
....example1 = AutoClone(test.citynames, test.cityroutes, test.seed,
........................test.generations, test.mutate)
....example2 = Randomisation(test.citynames, test.cityroutes,
test.seed,
........................test.generations)
....example3 = BruteForce(test.citynames, test.cityroutes)

I am really stuck trying to work out how to pass variables to timeit
to allow me to run any of the examples...

Any help would be great!


From sturlamolden at yahoo.no  Wed Feb 18 20:36:25 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Wed, 18 Feb 2009 17:36:25 -0800 (PST)
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
Message-ID: <11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>

On Feb 10, 7:28?am, oyster <lepto.pyt... at gmail.com> wrote:
> I mean this
> [code]
> def fib(n):
> ? ? if n<=1:
> ? ? ? ? return 1
> ? ? return fib(n-1)+fib(n-2)


Let's rewrite that slightly and see...



def fib(n, _map=None):
    if not _map: _map = map
    if n > 2:
        return sum(_map(fib, (n-1, n-2)))
    else:
        return 1


if __name__ == '__main__':

    from multiprocessing import Pool
    from time import clock

    p = Pool()
    n = 36

    t0 = clock()
    fib(n, p.map)
    t1 = clock()

    print 'parallel t: %f seconds' % (t1-t0)

    t0 = clock()
    fib(n)
    t1 = clock()

    print 'sequential t: %f seconds' % (t1-t0)


With two cores:

E:\>python fibotest.py
parallel t: 31.300226 seconds
sequential t: 48.070695 seconds


Yes it can!




Sturla Molden


From gert.cuykens at gmail.com  Wed Feb 18 21:06:03 2009
From: gert.cuykens at gmail.com (gert)
Date: Wed, 18 Feb 2009 18:06:03 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
Message-ID: <6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>

Can you first explain why x stay's 0 please and how i should update x
using threads ?

from tkinter import *
from _thread import start_new_thread
from time import sleep

x=0
def weegbrug(x):
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,(x,))

root = Tk()
v = StringVar()
v.set("00000")
txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
font=("Helvetica", 300))
txt.pack(expand=YES, fill=BOTH)
root.title("Weegbrug")
root.after(500, lambda:v.set(x))
root.mainloop()




From pavlovevidence at gmail.com  Wed Feb 18 21:13:25 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 18:13:25 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com>
Message-ID: <ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com>

On Feb 18, 4:23?pm, sturlamolden <sturlamol... at yahoo.no> wrote:
> On 18 Feb, 00:08, Lionel <lionel.ke... at gmail.com> wrote:
>
> > 1) What is "recarray"?
>
> An ndarray of what C programmers know as a "struct", in which each
> field is accessible by its name.
>
> That is,
>
> struct rgba{
> ? unsigned char r;
> ? unsigned char g;
> ? unsigned char b;
> ? unsigned char a;
>
> };
>
> struct rgba arr[480][640];
>
> is similar to:
>
> import numpy as np
> rbga = np.dtype({'names':list('rgba'), 'formats':[np.uint8]*4})
> arr = np.array((480,640), dtype=rgba)
>
> Now you can access the r, g, b and a fields directly using arr['r'],
> arr['g'], arr['b'], and arr['a'].
> Internally the data will be represented compactly as with the C code
> above. If you want to view the data as an 480 x 640 array of 32 bit
> integers instead, it is as simple as arr.view(dtype=np.uint32).
> Formatted binary data can of course be read from files using
> np.fromfile with the specified dtype, and written to files by passing
> a recarray as buffer to file.write. You can thus see NumPy's
> recarray's as a more powerful alternative to Python's struct module.
>
> > I don't really see in the diocumentation how portions are loaded, however.
>
> Prior to Python 2.6, the mmap object (which numpy.memmap uses
> internally) does not take an offset parameter. But when NumPy are
> ported to newer version of Python this will be fixed. You should then
> be able to memory map with an ndarray from a certain offset. To make
> this work now, you must e.g. backport mmap from Python 2.6 and use
> that with NumPy. Not difficult, but nobody has bothered to do it (as
> far as I know).

You can use an offset with numpy.memmap today; it'll mmap the whole
file, but start the array data at the given offset.

The offset parameter of mmap itself would be useful to map small
portions of gigabyte-sized files, and maybe numpy.memmap can take
advantage of that if the user passes an offset parameter.  One thing
you can't do with mmap's offset, but you can do with numpy.memmap, is
to set it to an arbitary value, since it has to be a multiple of some
large number (something like 1 MB, depending on the OS).


Carl Banks


From jnoller at gmail.com  Wed Feb 18 21:14:06 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Wed, 18 Feb 2009 21:14:06 -0500
Subject: PyYaml in standard library?
In-Reply-To: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
References: <ef38762f0902180111p5b04d1dfm9ed36d5c723c45c0@mail.gmail.com>
Message-ID: <4222a8490902181814s48987502x394008858797d55@mail.gmail.com>

On Wed, Feb 18, 2009 at 4:11 AM, Brendan Miller <catphive at catphive.net> wrote:
> I'm just curious whether PyYaml is likely to end up in the standard
> library at some point?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Personally, loving the hell out of yaml (and pyyaml) as much as I do,
I'd love to see this; however interested people should pass the idea
to python-ideas, and write a PEP. It would need a dedicated maintainer
as well as the other things stdlib modules require.

-jesse


From jnoller at gmail.com  Wed Feb 18 21:16:11 2009
From: jnoller at gmail.com (Jesse Noller)
Date: Wed, 18 Feb 2009 21:16:11 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
In-Reply-To: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
Message-ID: <4222a8490902181816j708f0b5y81b246e5a0fa800d@mail.gmail.com>

On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
<Graham.Dumpleton at gmail.com> wrote:
> Why is the multiprocessing module, ie., multiprocessing/process.py, in
> _bootstrap() doing:
>
>  os.close(sys.stdin.fileno())
>
> rather than:
>
>  sys.stdin.close()
>
> Technically it is feasible that stdin could have been replaced with
> something other than a file object, where the replacement doesn't have
> a fileno() method.
>
> In that sort of situation an AttributeError would be raised, which
> isn't going to be caught as either OSError or ValueError, which is all
> the code watches out for.
>
> Graham
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I don't know why it was implemented that way. File an issue on the
tracker and assign it to me (jnoller) please.


From steve at holdenweb.com  Wed Feb 18 21:20:13 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 18 Feb 2009 21:20:13 -0500
Subject: Threading and tkinter
In-Reply-To: <6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
Message-ID: <gnifks$rb1$1@ger.gmane.org>

gert wrote:
> Can you first explain why x stay's 0 please and how i should update x
> using threads ?
> 
> from tkinter import *
> from _thread import start_new_thread
> from time import sleep
> 
> x=0
> def weegbrug(x):
>     while True:
>         x=x+1
>         sleep(0.5)
> start_new_thread(weegbrug,(x,))
> 
> root = Tk()
> v = StringVar()
> v.set("00000")
> txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
> font=("Helvetica", 300))
> txt.pack(expand=YES, fill=BOTH)
> root.title("Weegbrug")
> root.after(500, lambda:v.set(x))
> root.mainloop()
> 
The reason x stays at zero has nothing to do with threading.

The statement

    x=x+1

(which, by the way, should stylistically be written

    x = x + 1

if you want your code to be readable) doesn't change anything outside
the function. Function arguments are values: since x is a parameter of
the function, it exists only inside the function call's namespace.

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From justinli79 at gmail.com  Wed Feb 18 21:29:02 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 18:29:02 -0800 (PST)
Subject: Building python with sqlite3
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
	<mailman.180.1234948423.11746.python-list@python.org>
Message-ID: <1c1605a8-006c-455d-9120-962a61c9082d@x29g2000prf.googlegroups.com>

On Feb 18, 5:13?pm, Christian Heimes <li... at cheimes.de> wrote:
> Justin Li schrieb:
>
> > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > make, make install, to import sqlite3 leads to ImportError. It looks
> > like I have to build Python with sqlite. I have sqlite3 installed on
> > my system. How should I build Python with it? I did not find any
> > options relating with sqlite3 of configure and Makefile.
>
> Do you have the development files installed as well? Run "make" again
> and look at the list of missing modules.
>
> Christian

Thanks for your reply, Christian.

And yes, I have. I looked into this. I'm working on a 64bit machine.
And the sqlite3 is 64bit as well. Should I install a 32bit sqlite3? I
think when I building python, the configure program should detect if
my system 32bit or 64bit one and look for proper sqlite3 version.

Is that the problem?

Thanks again,
Justin


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 18 21:58:32 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 19 Feb 2009 02:58:32 GMT
Subject: Timeit
References: <95457df7-57ac-4d5c-b68d-2bd804ae3c90@x38g2000yqj.googlegroups.com>
Message-ID: <pan.2009.02.19.02.58.32@REMOVE.THIS.cybersource.com.au>

On Wed, 18 Feb 2009 17:35:16 -0800, cokofreedom wrote:

> I am really stuck trying to work out how to pass variables to timeit to
> allow me to run any of the examples...

setup = "from __main__ import example1, example2, example3"
Timer("example1()", setup)


In Python 2.6 you can also pass function objects directly.


-- 
Steven


From rdmurray at bitdance.com  Wed Feb 18 22:15:59 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 19 Feb 2009 03:15:59 +0000 (UTC)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com>
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
	<788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com>
Message-ID: <gniitf$1uu$1@ger.gmane.org>

Thomas Allen <thomasmallen at gmail.com> wrote:
> On Feb 18, 4:51 am, alex23 <wuwe... at gmail.com> wrote:
> > On Feb 18, 7:34 pm, rdmur... at bitdance.com wrote:
> >
> > > Yeah, but wget -r -k will do that bit of it, too.
> >
> > Wow, nice, I don't know why I never noticed that. Cheers!
> 
> Hm...doesn't do that over here. I thought it may have been because of
> absolute links (not to site root), but it even leaves things like <a
> href="/">. Does it work for you guys?

It works for me.  The sample pages I just tested on it don't use
any href="/" links, but my 'href="/about.html"' got properly
converted to 'href="../about.html"'.  (On the other hand my '/contact.html'
got converted to a full external URL...but that's apparently because the
contact.html file doesn't actually exist :)

--RDM



From alan.isaac at gmail.com  Wed Feb 18 22:29:17 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 03:29:17 GMT
Subject: block dynamic attribute creation (was: get descriptor from
	instance)
In-Reply-To: <mailman.217.1234998934.11746.python-list@python.org>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
Message-ID: <hm4nl.271$tw4.14@nwrddc01.gnilink.net>

On 2/18/2009 6:15 PM Gabriel Genellina apparently wrote:
> type(a).x 

OK, that's good.  I'd like to sometimes lock attribute creation on
instances of a class but still allow properties to function
correctly.  Will something like below be satisfactory?

Thanks,
Alan

   def __setattr__(self, attr, val):
     """If instance locked, allow no new attributes."""
     try:
       #get the class attribute if it exists
       p = getattr(type(self),attr)
       #if it's a descriptor, use it to set val
       p.__set__(self, val)
     except AttributeError: #no descriptor
       if hasattr(self, attr): #update val
         self.__dict__[attr] = val
       elif getattr(self, '_attrlock', False):
         raise AttributeError(
         "Set _attrlock to False to add attributes.")
       else:
         #new attributes allowed
         self.__dict__[attr] = val


From sri_annauni at yahoo.co.in  Wed Feb 18 23:22:09 2009
From: sri_annauni at yahoo.co.in (srinivasan srinivas)
Date: Thu, 19 Feb 2009 09:52:09 +0530 (IST)
Subject: Python Module for console text formatting?
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
	<f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>
Message-ID: <208530.16726.qm@web7908.mail.in.yahoo.com>

Hi,
Is it possible to apply more than one formatting to a string? 
For ex: the string 'test' has to be underlined and it should be bold. How to do that?

Thanks,
Srini


________________________________
From: geremy condra <cto at openmigration.net>
To: python-list at python.org
Sent: Wednesday, 18 February, 2009 10:04:34 AM
Subject: Re: Python Module for console text formatting?

You can insert those codes just like you would any other character. If there's enough interest I can whip up a wrapper library for you.

http://www.linux.gr/cgi-bin/man2html?console_codes+4


On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <sri_annauni at yahoo.co.in> wrote:


Hi,
Does anyone know any python module other than 'ConsoleFormat0.1.1' used to format text on console?
For example, printing bold characters on console.

Thanks,
Srini


? ? ?Did you know? You can CHAT without downloading messenger. Go to http://in.webmessenger.yahoo.com/
--
http://mail.python.org/mailman/listinfo/python-list



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at http://OpenMigration.net.



      Share files, take polls, and make new friends - all under one roof. Go to http://in.promos.yahoo.com/groups/
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From Graham.Dumpleton at gmail.com  Thu Feb 19 00:23:10 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Wed, 18 Feb 2009 21:23:10 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
Message-ID: <c74d2255-2dd4-466c-8f19-ea14965f0afd@q30g2000prq.googlegroups.com>

On Feb 19, 1:16?pm, Jesse Noller <jnol... at gmail.com> wrote:
> On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
>
>
>
> <Graham.Dumple... at gmail.com> wrote:
> > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > _bootstrap() doing:
>
> > ?os.close(sys.stdin.fileno())
>
> > rather than:
>
> > ?sys.stdin.close()
>
> > Technically it is feasible that stdin could have been replaced with
> > something other than a file object, where the replacement doesn't have
> > a fileno() method.
>
> > In that sort of situation an AttributeError would be raised, which
> > isn't going to be caught as either OSError or ValueError, which is all
> > the code watches out for.
>
> > Graham
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> I don't know why it was implemented that way. File an issue on the
> tracker and assign it to me (jnoller) please.

Created as:

  http://bugs.python.org/issue5313

I don't see option to assign, so you are on nosy list to start with.

Graham


From mnordhoff at mattnordhoff.com  Thu Feb 19 00:24:34 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Thu, 19 Feb 2009 05:24:34 +0000
Subject: Revision Control
In-Reply-To: <499C5521.2040705@tim.thechases.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
	<499C5521.2040705@tim.thechases.com>
Message-ID: <499CED12.3040802@mattnordhoff.com>

Tim Chase wrote:

<snip cvs, svn and git>

>> -Mercurial (this is a big up and coming RCS)
> 
> This is currently my favorite:  good branching/merging, fast, written
> mostly in Python (one C extension module, IIRC), and a simple interface
> 
>> -Bazaar (written in Python. Also pretty new. I don't know about Windows
>> support)
> 
> I like Bazaar (bzr), but the last several times I've tried it, it's been
> a little slow.  This has been steadily improving, and I like their
> emphasis on correctness foremost.  It's a lot like mercurial, but is
> pure python (no C extension module) which makes it nice to deploy into
> environments such as my shared web-hosting service where I can't build
> extension C modules or install packages such as hg/git/svn from the
> repository.

FWIW, Bazaar and Mercurial both have about half a dozen C modules. (Most
of Bazaar's are Pyrex, though, not straight C.)

The next release of Mercurial will add support for running without them.
 (Bazaar already supports that, of course.)

<snip summary>
-- 


From pavlovevidence at gmail.com  Thu Feb 19 00:40:24 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 18 Feb 2009 21:40:24 -0800 (PST)
Subject: Problem--Extending the behavior of an upstream package
Message-ID: <60848752-2c3f-4512-bf61-0bc11c919f99@i20g2000prf.googlegroups.com>

Ok, I think I know I want to do this, but I thought I'd run it by yins
guys

I have a fairly large and complex application with two top-level
packages, which we'll call upstream and mine.  The "upstream" package
isn't really upstream.  I own both packages, but I think of the
upstream package as a third-party library relative to the mine
package.  The mine package contains code specific to the application.

Anyway, the upstream modules provide lots of classes and other
functionality, but I want to extend their behavior in various ways.
Say for instance I have a class called Box defined in the module
upstream.packaging.  In this particular application, it makes sense
for all boxes to have a certain behavior, such as a certain way of
being drawn.  So I define a module called mine.custom_packaging which
defines a subclass of upstream.packaging.Box.  That's straightforward
enough.

The problem comes when a different part of the upstream package also
subclasses or creates a Box.  When an upstream function creates a box,
it creates an upstream.packaging.Box instead of a
mine.custom_packaging.Box, but I'd want it to do the latter.

If this were something that happened only once or twice, it'd be no
big deal, I'd just work around it.  However, it's very common.  The
upstream package is almost a complete application unto itself; it only
needs data and a small amount of top-level code to run.  The sort of
tight internal coupling that exists within the upstream package makes
it a logistical problem to extend it.  And the thing is, I can't think
of a convenient way to do it that's tolerably magical, and I am quite
tolerant of homebrew magic in my code.  A particularly troublesome
situation is when a base class and subclass are defined in the same
module, and I want to customize both.  Even things like disambiguating
nomenclature trip me up.

It isn't just classes, BTW.  Sometimes I want to override functions,
or modify permanent data.

So, how would you approach something like this?

(After a little discussion--or not--I'll post some things I've
considered, including a few approaches I've actually implemented.  But
I don't want to taint everyone's ideas just yet.)


Carl Banks


From justinli79 at gmail.com  Thu Feb 19 00:49:03 2009
From: justinli79 at gmail.com (Justin Li)
Date: Wed, 18 Feb 2009 21:49:03 -0800 (PST)
Subject: Building python with sqlite3
References: <d61d8a2c-31a6-45f7-a7cc-3c33f4f5c931@m12g2000vbp.googlegroups.com>
	<mailman.180.1234948423.11746.python-list@python.org>
	<1c1605a8-006c-455d-9120-962a61c9082d@x29g2000prf.googlegroups.com>
Message-ID: <b326712f-916e-4201-9d37-2ecd851bf148@m12g2000vbp.googlegroups.com>

On Feb 18, 6:29 pm, Justin Li <justinl... at gmail.com> wrote:
> On Feb 18, 5:13 pm, Christian Heimes <li... at cheimes.de> wrote:
>
> > Justin Li schrieb:
>
> > > I'm building and installing Ptyhon 2.6.1 on Linux. After configure,
> > > make, make install, to importsqlite3leads to ImportError. It looks
> > > like I have to build Python with sqlite. I havesqlite3installed on
> > > my system. How should I build Python with it? I did not find any
> > > options relating withsqlite3of configure and Makefile.
>
> > Do you have the development files installed as well? Run "make" again
> > and look at the list of missing modules.
>
> > Christian
>
> Thanks for your reply, Christian.
>
> And yes, I have. I looked into this. I'm working on a 64bit machine.
> And thesqlite3is 64bit as well. Should I install a 32bitsqlite3? I
> think when I building python, the configure program should detect if
> my system 32bit or 64bit one and look for propersqlite3version.
>
> Is that the problem?
>
> Thanks again,
> Justin


I fixed it. I download sqlite3 from website and install it. As a
result, it works fine now.


From aleksandr.goretoy at gmail.com  Thu Feb 19 01:13:38 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Thu, 19 Feb 2009 00:13:38 -0600
Subject: Python Module for console text formatting?
In-Reply-To: <208530.16726.qm@web7908.mail.in.yahoo.com>
References: <867965.2501.qm@web7903.mail.in.yahoo.com>
	<f3cc57c60902172034v7fa8b3det9748ef3dae6fd41b@mail.gmail.com>
	<208530.16726.qm@web7908.mail.in.yahoo.com>
Message-ID: <fa98a9e30902182213l37d6bbf7s714f2d23bf32a0f8@mail.gmail.com>

I created a little script for doing stdout coloring for me a while back.
Maybe this will get you closer to what you are looking for. It's kinda
hackish, but it works.

http://code.google.com/p/python-stdout-colors/

-Alex Goretoy
http://www.goretoy.com



On Wed, Feb 18, 2009 at 10:22 PM, srinivasan srinivas <
sri_annauni at yahoo.co.in> wrote:

> Hi,
> Is it possible to apply more than one formatting to a string?
> For ex: the string 'test' has to be underlined and it should be bold. How
> to do that?
>
> Thanks,
> Srini
>  ------------------------------
> *From:* geremy condra <cto at openmigration.net>
> *To:* python-list at python.org
> *Sent:* Wednesday, 18 February, 2009 10:04:34 AM
> *Subject:* Re: Python Module for console text formatting?
>
> You can insert those codes just like you would any other character. If
> there's enough interest I can whip up a wrapper library for you.
>
> http://www.linux.gr/cgi-bin/man2html?console_codes+4
>
> On Tue, Feb 17, 2009 at 11:19 PM, srinivasan srinivas <
> sri_annauni at yahoo.co.in> wrote:
>
>>
>> Hi,
>> Does anyone know any python module other than 'ConsoleFormat0.1.1' used to
>> format text on console?
>> For example, printing bold characters on console.
>>
>> Thanks,
>> Srini
>>
>>
>>      Did you know? You can CHAT without downloading messenger. Go to
>> http://in.webmessenger.yahoo.com/
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> OpenMigration LLC- Open Source solutions for your business. Visit us at
> http://OpenMigration.net <http://openmigration.net/>.
>
> ------------------------------
> Add more friends to your messenger and enjoy! Invite them now.<http://in.rd.yahoo.com/tagline_messenger_6/*http://messenger.yahoo.com/invite/>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From diresu at web.de  Thu Feb 19 01:28:12 2009
From: diresu at web.de (Dietrich Bollmann)
Date: Thu, 19 Feb 2009 15:28:12 +0900
Subject: How to convert between Japanese coding systems?
Message-ID: <1235024892.3981.56.camel@pippi.pippi>

Hi,

Are there any functions in python to convert between different Japanese
coding systems?

I would like to convert between (at least) ISO-2022-JP, UTF-8, EUC-JP
and SJIS.  I also need some function to encode / decode base64 encoded
strings.

I get the strings (which actually are emails) from a server on the
internet with:

  import urllib
  server = urllib.urlopen(serverURL, parameters)
  email = server.read()

The coding systems are given in the response string:

Example:

email = '''[...]
Subject:
=?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
=?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
[...]
Content-Type: text/plain; charset=EUC-JP
[...]
Content-Transfer-Encoding: base64
[...]

cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K

'''

My idea is to first parse the 'email' string and to extract the email
body as well as the values of the 'Subject: ', the 'Content-Type: ' and
the 'Content-Transfer-Encoding: ' attributes and to after use them to
convert them to some other coding system:

Something in the lines of:

  (subject, contentType, contentTransferEncoding, content) =
parseEmail(email)

  to = 'utf-8'
  subjectUtf8 = decodeSubject(subject, to)

  from = contentType
  to = 'utf-8'
  contentUtf8 = convertCodingSystem(decodeBase64(content), from, to)

The only problem is that I could not find any standard functionality to
convert between different Japanese coding systems.

Thanks,

Dietrich Bollmann





From nad at acm.org  Thu Feb 19 02:02:53 2009
From: nad at acm.org (Ned Deily)
Date: Wed, 18 Feb 2009 23:02:53 -0800
Subject: v 3.0 mpkg
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
Message-ID: <nad-6492A8.23025218022009@ger.gmane.org>

In article 
<8c7f10c60902040337q617a37bfr9ec937b38e433fa9 at mail.gmail.com>,
 Simon Brunning <simon at brunningonline.net> wrote:
> 2009/2/4 John Forse <johnforse at talktalk.net>:
> >  Does anyone know if Python v3.0 is available as an .mpkg installer for Mac
> > 10.5.6. I have used 2.5 & updated to 2.6.1 this way, but can't find any
> > reference to one on the Python.org download site. I've downloaded the Python
> > 3.0 folder but can't follow how to install it without a .mpkg file. Any help
> > would be really appreciated.
> AFAIK there's no Python 3.0 installer for the Mac. You'll have to
> build it yourself - see <http://tinyurl.com/6zkem7>.

Follow up:  Python 3.0.1 has been released and, with it, an installer 
image for OS X:

<http://www.python.org/download/releases/3.0.1/>

-- 
 Ned Deily,
 nad at acm.org



From apt.shansen at gmail.com  Thu Feb 19 02:35:55 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Wed, 18 Feb 2009 23:35:55 -0800
Subject: v 3.0 mpkg
In-Reply-To: <nad-6492A8.23025218022009@ger.gmane.org>
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
	<nad-6492A8.23025218022009@ger.gmane.org>
Message-ID: <7a9c25c20902182335n226e4496vce023b1627baaf3a@mail.gmail.com>

> Follow up:  Python 3.0.1 has been released and, with it, an installer
> image for OS X:
>
> <http://www.python.org/download/releases/3.0.1/>
>

How doe the 3.0 installer on the mac interact with existing installs?
I have the system install but more importantly the python.org one
which I can't have messed up; will this install just as 'python3'?

I wanna be sure it won't mess anything up on my system, as my company
is still on 2.4 as a standard and barely preparing to move to 2.5 --
we only use it on our macs installs.

Thanks..

--S


From __peter__ at web.de  Thu Feb 19 02:51:03 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 08:51:03 +0100
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org>
Message-ID: <gnj317$o4e$01$1@news.t-online.com>

Dietrich Bollmann wrote:

> I get the strings (which actually are emails) from a server on the
> internet with:
> 
>   import urllib
>   server = urllib.urlopen(serverURL, parameters)
>   email = server.read()
> 
> The coding systems are given in the response string:
> 
> Example:
> 
> email = '''[...]
> Subject:
> =?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
> =?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
> [...]
> Content-Type: text/plain; charset=EUC-JP
> [...]
> Content-Transfer-Encoding: base64
> [...]
> 
> cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
> 
> '''

Is that an email? Maybe you can get it in a format that is supported by the
email package in the standard library.

> The only problem is that I could not find any standard functionality to
> convert between different Japanese coding systems.

Then you didn't look hard enough:
 
>>> s = "????".decode("utf8") # i have no idea what that means
>>> s.encode("iso-2022-jp")
'\x1b$B2q<R35MW\x1b(B'
>>> s.encode("euc-jp")
'\xb2\xf1\xbc\xd2\xb3\xb5\xcd\xd7'
>>> s.encode("sjis")
'\x89\xef\x8e\xd0\x8aT\x97v'

See also http://www.amk.ca/python/howto/unicode

Peter


From cwitts at gmail.com  Thu Feb 19 03:12:12 2009
From: cwitts at gmail.com (Chris)
Date: Thu, 19 Feb 2009 00:12:12 -0800 (PST)
Subject: Delete lines which contain string in a file
References: <7cbf2f3a0902181342w20d3bcbfnf640a177b221c8a6@mail.gmail.com> 
	<mailman.211.1234995881.11746.python-list@python.org>
Message-ID: <452cd8ba-392f-451d-8f51-f81bd1eb0d8b@j8g2000yql.googlegroups.com>

On Feb 19, 12:24?am, Steve Holden <st... at holdenweb.com> wrote:
> Rudi Goldman wrote:
> > Hi,
> > Go easy on me as I am a new to Python and am trying to solve a practical
> > problem that is driving me bananas.
> > Basically I have 2 text files, a source and a target. I want to be able
> > to delete all of the lines in the target file which contain text from
> > any line in the source file.
> > i.e.
> > Source: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Target:
> > 111 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? xxx 111 yyy ?
> > 222 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? xxx ?333 sss
> > 333 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? jjj ? 444 sss
>
> > After executing this code the target file should only consist of the
> > line: ? ? jjj ? 444 sss
> > Any help on this one would be greatly appreciated.
>
> Is this homework?
>
> How far have you got with your design?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Who needs python for this...

cwitts at cwitts-mint ~ $ cat src.txt
[111,222,333]
cwitts at cwitts-mint ~ $ cat tgt.txt
xxx 111 yyy
xxx  333 sss
jjj   444 sss
cwitts at cwitts-mint ~ $ grep -v -f src.txt tgt.txt
jjj   444 sss


From mail at microcorp.co.za  Thu Feb 19 03:25:28 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 19 Feb 2009 10:25:28 +0200
Subject: PIL install driving me mad! With solution!
References: <c24de59f-bd92-4dcb-bcbe-6563eabea96c@x29g2000prf.googlegroups.com>
Message-ID: <000c01c99270$f0bbc600$0d00a8c0@hendrik>

"bleah" <joh.. at ph...arizona.edu> wrote:


>I'm trying to get PIL 1.16 installed on a SUSE SLES10 system, and
>cannot, for the life of me, get the thing to compile with jpeg
>support.
>
>The libjpeg-devel libraries are installed, and are present in /usr/lib
>JUST WHERE SPECIFIED in the setup.py file, and the jpeglib.h incliude
>file is present  JUST WHERE SPECIFIED in the setup.py file.
>
>The build process proceeds without errors, yet selftest.py fails with
>the error:
>
>tonic:~/html2pdf_sources/Imaging-1.1.6 # python selftest.py
>*****************************************************************
>Failure in example: _info(Image.open("Images/lena.jpg"))

This is the problem.
Lena with the feathered hat is a shy girl,
and she does not allow just anybody 
to look at her.

:-)

- Hendrik



From Lie.1296 at gmail.com  Thu Feb 19 03:29:53 2009
From: Lie.1296 at gmail.com (Lie)
Date: Thu, 19 Feb 2009 00:29:53 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
Message-ID: <fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>

On Feb 18, 8:02?pm, r <rt8... at gmail.com> wrote:
> Hello Josh,
> Blender is a lost cause. It is a powerful app but the UI is horrible.
> Even the Blender folks admit only a complete rewrite could solve the
> major flaws that plague the design<CITATION NEEDED>. So maybe i could salvage some code
> but for what i have in mind, Blender will look like a piece of
> software from the middle ages. And i am absolutly only looking to do
> this in 3D, 2D is boring.

Blender's UI is designed for effective and efficient 3D workflow, not
for low learning curve.



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 19 03:33:56 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 19 Feb 2009 09:33:56 +0100
Subject: Calling a class instance like a function
In-Reply-To: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
References: <gN1nl.200238$zQ4.37927@en-nntp-02.dc1.easynews.com>
Message-ID: <499d1960$0$18734$426a74cc@news.free.fr>

Uberman a ?crit :
> I'm wondering if there's a way to invoke a "function" operator on a Python
> class instance.  For example, given a class instance:
> 
> 	myClass = MyClass()
> 
> I want to call that instance like a function, with an argument value:
> 
> 	myClass(5.0)
> 
> I can override the "()" operator in C++, so I'm wondering if there's a way to
> do it in Python as well.


Filip already answered, but you may want to read this anyway:
http://docs.python.org/reference/datamodel.html#special-method-names

HTH


From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 19 03:47:48 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 19 Feb 2009 09:47:48 +0100
Subject: block dynamic attribute creation
In-Reply-To: <hm4nl.271$tw4.14@nwrddc01.gnilink.net>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
Message-ID: <499d1ca1$0$26184$426a74cc@news.free.fr>

Alan G Isaac a ?crit :
> On 2/18/2009 6:15 PM Gabriel Genellina apparently wrote:
>> type(a).x 
> 
> OK, that's good.  I'd like to sometimes lock attribute creation on
> instances of a class but still allow properties to function
> correctly.  Will something like below be satisfactory?
 >
> 
>   def __setattr__(self, attr, val):
>     """If instance locked, allow no new attributes."""
>     try:
>       #get the class attribute if it exists
>       p = getattr(type(self),attr)
>       #if it's a descriptor, use it to set val
>       p.__set__(self, val)
>     except AttributeError: #no descriptor
>       if hasattr(self, attr): #update val
>         self.__dict__[attr] = val
>       elif getattr(self, '_attrlock', False):
>         raise AttributeError(
>         "Set _attrlock to False to add attributes.")
>       else:
>         #new attributes allowed
>         self.__dict__[attr] = val


Might be safer to call on the parent class __setattr__ instead of 
directly assigning to the instance's dict Also, your tests in the except 
clause could be simplified:

       if not hasattr(self, attr) and getattr(self, '_attrlock', False):
         raise AttributeError(yadda yadda)
       # NB: assume newstyle class
       super(YourClass, self).__setattr__(attr, val)


My 2 cents.


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:29 -0200
Subject: os.popen encoding!
References: <gngtpj$1fi$1@ss408.t-com.hr>
	<mailman.187.1234960752.11746.python-list@python.org>
	<87ocwzzvym.fsf@mulj.homelinux.net> <gni9mm$bv0$1@ss408.t-com.hr>
Message-ID: <op.upk6r7nqx6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 22:38:45 -0200, SMALLp <pofuk at email.t-com.hr> escribi?:

> Thanks for help!
>
> My problem was actualy:
>>>> a = ["velja\xe8a 2009"]
>>>> print a    #will print
> ["velja\xe8a 2009"]
>>>> Print a[0]    #will print
> velja?a 2009

And why is that a problem?

Almost the only reason to print a list is when debugging a program. To
print a list, Python uses repr() on each of its elements. Otherwise, [5,
"5", u'5'] would be indistinguishable from [5, 5, 5], and you usually want
to know exactly *what* the list contains.

Perhaps if you tell us what do you want to do exactly someone can offer
more advice.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:45 -0200
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>
Message-ID: <op.uplaaqrax6zn5v@gabriel.sleipnir-bsas>

En Wed, 18 Feb 2009 23:36:25 -0200, sturlamolden <sturlamolden at yahoo.no>
escribi?:
> On Feb 10, 7:28?am, oyster <lepto.pyt... at gmail.com> wrote:

> Let's rewrite that slightly and see...
>
> def fib(n, _map=None):
>     if not _map: _map = map
>     if n > 2:
>         return sum(_map(fib, (n-1, n-2)))
>     else:
>         return 1
>
>
> With two cores:
>
> E:\>python fibotest.py
> parallel t: 31.300226 seconds
> sequential t: 48.070695 seconds
>
>
> Yes it can!

Are you kidding?
This is like building a house one brick at a time, but before placing a
new brick, you throw all the previous work and start again from start.
Certainly two workers would help more than one - but the best way to do it
is *NOT* to repeat all that additional work over and over in the first
place.
Even my Pentium I MMX 233MHz can compute fib(36) thousand of times faster
than that with the right algorithm. So I don't see the point in
parallelizing if you're going to get infinitely worse results...

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 03:54:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 06:54:53 -0200
Subject: block dynamic attribute creation (was: get descriptor from
	instance)
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
Message-ID: <op.uplbq3n5x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 01:29:17 -0200, Alan G Isaac <alan.isaac at gmail.com>
escribi?:

> OK, that's good.  I'd like to sometimes lock attribute creation on
> instances of a class but still allow properties to function
> correctly.  Will something like below be satisfactory?
>
>    def __setattr__(self, attr, val):
>      """If instance locked, allow no new attributes."""
>      try:
>        #get the class attribute if it exists
>        p = getattr(type(self),attr)
>        #if it's a descriptor, use it to set val
>        p.__set__(self, val)
>      except AttributeError: #no descriptor
>        if hasattr(self, attr): #update val
>          self.__dict__[attr] = val
>        elif getattr(self, '_attrlock', False):
>          raise AttributeError(
>          "Set _attrlock to False to add attributes.")
>        else:
>          #new attributes allowed
>          self.__dict__[attr] = val

The problem with using __setattr__ is that is slows down *all* attribute
writes considerably.

In particular, your code prevents using class attributes as a default
value for instance attributes (not a big deal, but I like it sometimes),
and you must remember to set a value for all attributes (even the "hidden"
ones used by any property). But if you feel OK with that, "just do it". I
think there are a few recipes in the Python Cookbook about this topic too.

-- 
Gabriel Genellina



From nad at acm.org  Thu Feb 19 03:58:23 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 00:58:23 -0800
Subject: v 3.0 mpkg
References: <2E75ECDE-6B15-471F-8747-ED4616EF4847@talktalk.net>
	<8c7f10c60902040337q617a37bfr9ec937b38e433fa9@mail.gmail.com>
	<nad-6492A8.23025218022009@ger.gmane.org>
	<7a9c25c20902182335n226e4496vce023b1627baaf3a@mail.gmail.com>
Message-ID: <nad-1E9864.00582319022009@ger.gmane.org>

In article 
<7a9c25c20902182335n226e4496vce023b1627baaf3a at mail.gmail.com>,
 Stephen Hansen <apt.shansen at gmail.com> wrote:
> > Follow up:  Python 3.0.1 has been released and, with it, an installer
> > image for OS X:
> > <http://www.python.org/download/releases/3.0.1/>
> How doe the 3.0 installer on the mac interact with existing installs?
> I have the system install but more importantly the python.org one
> which I can't have messed up; will this install just as 'python3'?
> 
> I wanna be sure it won't mess anything up on my system, as my company
> is still on 2.4 as a standard and barely preparing to move to 2.5 --
> we only use it on our macs installs.
 
<http://permalink.gmane.org/gmane.comp.python.apple/15546>

-- 
 Ned Deily,
 nad at acm.org



From justin.mailinglists at gmail.com  Thu Feb 19 04:02:01 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 19 Feb 2009 01:02:01 -0800 (PST)
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org>
Message-ID: <9132a12f-8ff5-4a5a-909d-fb322af42936@r3g2000vbp.googlegroups.com>

On Feb 19, 2:28?pm, Dietrich Bollmann <dir... at web.de> wrote:
> Are there any functions in python to convert between different Japanese
> coding systems?
>
> I would like to convert between (at least) ISO-2022-JP, UTF-8, EUC-JP
> and SJIS. ?I also need some function to encode / decode base64 encoded
> strings.
>
> Example:
>
> email = '''[...]
> Subject:
> =?UTF-8?Q?romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
> =?UTF-8?Q?=E3=82=AB=E3=83=8A=E6=BC=A2=E5=AD=97?=
> [...]
> Content-Type: text/plain; charset=EUC-JP
> [...]
> Content-Transfer-Encoding: base64
> [...]
>
> cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
>
> '''
>
> ? from = contentType
> ? to = 'utf-8'
> ? contentUtf8 = convertCodingSystem(decodeBase64(content), from, to)
>
> The only problem is that I could not find any standard functionality to
> convert between different Japanese coding systems.
>
> Thanks,
>
> Dietrich Bollmann

import base64

ENCODINGS = ['ISO-2022-JP', 'UTF-8', 'EUC-JP', 'SJIS']

def decodeBase64(content):
    return base64.decodestring(content)

def convertCodingSystem(s, _from, _to):
    unicode = s.decode(_from)
    return unicode.encode(_to)

if __name__ == '__main__':
    content = 'cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K'
    _from = 'EUC-JP'
    for _to in ENCODINGS:
        x = convertCodingSystem(decodeBase64(content), _from, _to)
        print _to, repr(x)



From sjmachin at lexicon.net  Thu Feb 19 04:45:03 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 19 Feb 2009 01:45:03 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.17.1234763590.11746.python-list@python.org>
	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com> 
	<mailman.145.1234901288.11746.python-list@python.org>
	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au> 
	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com> 
	<mailman.203.1234987578.11746.python-list@python.org>
	<gnhqmf$r2b$00$2@news.t-online.com> 
	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
Message-ID: <84663b82-89f5-4f74-9091-b8fd65b92c5e@b38g2000prf.googlegroups.com>

On Feb 19, 6:47?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__pete... at web.de>
> declaimed the following in comp.lang.python:
>
> > Steve Holden wrote:
>
> > > Jervis Whitley wrote:
> > >>> What happens when you have hundreds of megabytes, I don't know.
>
> > >> I hope I never have to test a word that is hundreds of megabytes long
> > >> for a vowel :)
>
> > > I see you don't speak German ;-)
>
> > I tried to come up with a funny way to point out that you're a fool.
>
> > But because I'm German I failed.
>
> ? ? ? ? Yeah... the proper language to bemoan is Welsh <G>
>
> Where "w" is vowel <G>

Better bemoaned is Czech which can go on and on using only L and R as
"sonorant consonants" instead of vowels.



From gert.cuykens at gmail.com  Thu Feb 19 05:03:21 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 19 Feb 2009 02:03:21 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
	<mailman.222.1235010024.11746.python-list@python.org>
Message-ID: <999bdec3-cf58-4e30-acac-e62d1b8ad340@k19g2000yqg.googlegroups.com>

On Feb 19, 3:20?am, Steve Holden <st... at holdenweb.com> wrote:
> gert wrote:
> > Can you first explain why x stay's 0 please and how i should update x
> > using threads ?
>
> > fromtkinterimport *
> > from _thread import start_new_thread
> > from time import sleep
>
> > x=0
> > def weegbrug(x):
> > ? ? while True:
> > ? ? ? ? x=x+1
> > ? ? ? ? sleep(0.5)
> > start_new_thread(weegbrug,(x,))
>
> > root = Tk()
> > v = StringVar()
> > v.set("00000")
> > txt = Label(root, textvariable=v, width=800, height=600, bg="yellow",
> > font=("Helvetica", 300))
> > txt.pack(expand=YES, fill=BOTH)
> > root.title("Weegbrug")
> > root.after(500, lambda:v.set(x))
> > root.mainloop()
>
> The reason x stays at zero has nothing to do withthreading.
>
> The statement
>
> ? ? x=x+1
>
> (which, by the way, should stylistically be written
>
> ? ? x = x + 1
>
> if you want your code to be readable) doesn't change anything outside
> the function. Function arguments are values: since x is a parameter of
> the function, it exists only inside the function call's namespace.
>

Oeps :) Anyway will this x work in tkinter

from _thread import start_new_thread
from time import sleep

x=0
def weegbrug():
    global x
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,())

while True:
    print(x)


From mail at microcorp.co.za  Thu Feb 19 05:08:22 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Thu, 19 Feb 2009 12:08:22 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
Message-ID: <009901c9927a$de95e280$0d00a8c0@hendrik>

 "gert" <gert......s at gmail.com> wrote:


>On Feb 18, 8:25 am, "Hendrik van Rooyen" <m... at microcorp.co.za> wrote:
>> "gert" <gert.cuyk... at gmail.com>wrote:
>>
>> > After reading the docs and seeing a few examples i think this should
>> > work ?
>> > Am I forgetting something here or am I doing something stupid ?
>> > Anyway I see my yellow screen, that has to count for something :)
>>
>> > from tkinter import *
>> > from threading import Thread
>>
>> > class Weegbrug(Thread):
>> > def __init__(self,v):
.> > self.v=v
>> > Thread.__init__(self)
>> > def run(self):
>> > while True:
>> > with open('com1','r') as f:
>> > for line in f:
>> > self.v.set(line[2:-1])
>>
>> It is in general not a good idea to directly
>> access GUI variables from outside the
>> GUI main loop.
>> There is a recipe for doing this sort of thing,
>> but as usual I have lost the reference.
>> What it does is that instead of interfering directly
>> as above, you put the data on a queue.
>>
>> Then, you use the after() call to set up a call
>> to a routine that reads the queue, and configures the
>> display, and then uses after again to call itself again
>> after a time, thereby keeping the GUI stuff in the GUI
>> mainloop.
>>
>
>from tkinter import *
>from threading import Thread
>
>class Weegbrug(Thread):
>    def __init__(self):
>        self.display='00000'
>        Thread.__init__(self)
>    def run(self):
>        x=0
>        while True:
>            x=x+1
>            self.display=x

Still mucking around from outside the GUI.

>            #with open('com1','r') as f:
>            #     for l in f:
>            #         self.display=l[2:-1]
>
>root = Tk()
>v = StringVar()
>v.set('00000')
>w = Weegbrug()
>w.start()
>tx = Label(root, textvariable=v, width=800, height=600, bg='yellow',
>font=('Helvetica', 300))
>tx.pack(expand=YES, fill=BOTH)
>root.title('Weegbrug')
>root.overrideredirect(1)
>root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
>root.winfo_screenheight()))
>root.after(500, v.set(w.display))

root.after(500,displayer(q))  # You set up a "stutter thread" like this

>root.mainloop()
>
>Why does this not work ?
>It only shows one result ?

You are only calling it once.
Read my story above again.  (And Again)
Specially the bit about putting the
values into a queue.

You need to do something like this:

def displayer(q):
  # stuff to read the queue and update the display
  root.after(500, displayer(q))        # This makes sure it keeps on stuttering

Where q is an instance of Queue.Queue

There is a nice recipe by Thomas Haeller (?) but I have lost the link.

- Hendrik




From justin.mailinglists at gmail.com  Thu Feb 19 05:12:18 2009
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Thu, 19 Feb 2009 02:12:18 -0800 (PST)
Subject: How to convert between Japanese coding systems?
References: <mailman.227.1235024898.11746.python-list@python.org> 
	<9132a12f-8ff5-4a5a-909d-fb322af42936@r3g2000vbp.googlegroups.com>
Message-ID: <d7369644-d976-45a4-b8e0-eba6fdb80a0c@17g2000vbf.googlegroups.com>

import email
from email.Header import decode_header
from unicodedata import name as un

MS = '''\
Subject: =?UTF-8?Q?
romaji=E3=81=B2=E3=82=89=E3=81=8C=E3=81=AA=E3=82=AB=E3=82=BF?=
Date: Thu, 19 Feb 2009 09:34:56 -0000
MIME-Version: 1.0
Content-Type: text/plain; charset=EUC-JP
Content-Transfer-Encoding: base64

cm9tYWpppNKk6aSspMqlq6W/paulyrTBu/oNCg0K
'''

def get_header(msg, name):
    (value, charset), = decode_header(msg.get(name))
    if not charset: return value
    return value.decode(charset)

if __name__ == '__main__':
    msg = email.message_from_string(MS)
    s = get_header(msg, 'Subject')
    print repr(s)
    for c in s:
        try: print un(c)
        except ValueError: print repr(c)
    print

    e = msg.get_content_charset()
    b = msg.get_payload(decode=True).decode(e)
    print repr(b)
    for c in b:
        try: print un(c)
        except ValueError: print repr(c)
    print


From oswald.harry at gmail.com  Thu Feb 19 05:21:51 2009
From: oswald.harry at gmail.com (harryos)
Date: Thu, 19 Feb 2009 02:21:51 -0800 (PST)
Subject: how to list all installed modules
References: <c57a82f2-bddc-415c-89ae-d442811411f4@b40g2000pri.googlegroups.com>
	<4-6dndjITMU90wHUnZ2dnUVZ_qvinZ2d@pdx.net>
Message-ID: <abbaed9c-f80a-41f8-b102-e093b0706b67@s9g2000prg.googlegroups.com>

On Feb 18, 11:10?pm, Scott David Daniels <Scott.Dani... at Acm.Org>
> Are you running F:\Python25\python.exe (or F:\Python25\pythonw.exe)?
> open a command window (run cmd), and type:
> ? ? ?C:\> python
> ? ? ?...
> ? ? ?>>> import sys
> ? ? ?>>> for dirname in ?sys.path:
> ? ? ? ? ? ? ?print sys.path
>
> I suspect something you see printed will surprise you.
> Either the banner, identifying a Python version you were
> not expecting, or perhaps a bunch of C:-based directories.
> If this does not help you decipher the problem, try running
> ? ? ? python -v
> Python verbose mode (You will get a _lot_ of output).
> Then, when you (finally) get a ">>>" prompt, type:
> ? ? >>> import pygame
> and you will see eaxctly what lookups are tried.


thanks Scott for the detailed reply..
I reinstalled python and pygame and now things are working..:-)
thanks  again
harry


From rubik_wizard at NO.SPAMhotmail.com  Thu Feb 19 05:33:30 2009
From: rubik_wizard at NO.SPAMhotmail.com (Neil)
Date: Thu, 19 Feb 2009 10:33:30 -0000
Subject: Newbie Q about Turtle Gfx
References: <ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d@bt.com>
	<jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d@bt.com>
Message-ID: <0bCdnXbPLcAYqADUnZ2dnUVZ8i2WnZ2d@bt.com>

Hi

It turns out I should have used

t=turtle.Pen()

and not

t=turtle.pen()

My stupid mistake!

"Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
news:jYydnb8XE8HPOgHUnZ2dnUVZ8juWnZ2d at bt.com...
> Thanks everyone!
>
> It appears the info in the book is wrong. Trying what you have all 
> suggested
> has got it to work!
>
> Many thanks, and I am sure I will be back here again with other newbie
> problems!
>
> Neil
>
> "Neil" <rubik_wizard at NO.SPAMhotmail.com> wrote in message 
> news:ifidnR_GysdMFQHUnZ2dneKdnZzinZ2d at bt.com...
>> Hello
>>
>> Sorry if this is not an appropriate newsgroup for this problem. I am very 
>> new to Python but not new to programming.
>>
>> I am hoping to use Python to teach a class and have been looking at the 
>> online book 'Snake Wrangling for Kids'.
>>
>> I have followed the example
>>
>>>>>import turtle
>>>>>t=turtle.pen()
>>
>> which works fine and displays a turtle in a window.
>>
>> However whenever I try to use something like
>>
>>>>>t.forward(50)   (taken from the book)
>>
>> i get the error...
>>
>> Traceback (most recent call last):
>>  File "<pyshell#3>", line 1, in <module>
>>    t.forward(50)
>> AttributeError: 'dict' object has no attribute 'forward'
>>
>> I get the same error with t.left(10) etc. etc.
>>
>> I have tried this with V2.6 and V3
>>
>> Any ideas would be much appreciated.
>>
>> Thanks
>> Neil
>>
>>
>>
>
> 




From slafs.e at gmail.com  Thu Feb 19 05:53:56 2009
From: slafs.e at gmail.com (Slafs)
Date: Thu, 19 Feb 2009 02:53:56 -0800 (PST)
Subject: cx Oracle privileges
Message-ID: <1f0cae7c-d842-488c-a37e-cc4d799360e5@t11g2000yqg.googlegroups.com>

Hello

On my Debian server I'm using cx Oracle 5.1 (installation from a
package made from rpm by alien) with Python 2.5.2
and Oracle Instant Client 10.2.0.4.0. Installation went well but
simple test such as connecting to the db shows that only user root can
make a connection to a database, but any other user can't do this
becuse
>>> import cx_Oracle
>>> connection = cx_Oracle.Connection('user/pass at 1.2.3.4/dbsid')
hangs :/

I've checked privileges to instant client and cx_Oracle.so in site-
packages and they are fine.

Did anyone came across with similar problem or maybe can show me where
I should look for the cause?

Thanks in advance.


From http  Thu Feb 19 05:57:34 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 02:57:34 -0800
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<11edcd0d-ddaf-4c1a-8ec1-8214f2d86f18@w35g2000yqm.googlegroups.com>
	<mailman.233.1235034305.11746.python-list@python.org>
Message-ID: <7x1vtuiti9.fsf@ruckus.brouhaha.com>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:
> Even my Pentium I MMX 233MHz can compute fib(36) thousand of times faster
> than that with the right algorithm. So I don't see the point in
> parallelizing if you're going to get infinitely worse results...

The point is to test the parallelization scheme.  Recursive fibonacci
is a standard benchmark for this sort of thing.  Sturlamolden's test
may be inspired by a recent similar GHC test:

   http://donsbot.wordpress.com/2007/11/29/


From rushenaly at gmail.com  Thu Feb 19 06:36:13 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 03:36:13 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
Message-ID: <6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>

Thank you for all your answers...

I think i am going to pick Java instead of Python...

Rushen



From cdsd at d.com  Thu Feb 19 06:39:45 2009
From: cdsd at d.com (ssd)
Date: Thu, 19 Feb 2009 12:39:45 +0100
Subject: py test
Message-ID: <gnji5q$pih$2@aioe.org>

test

b 




From jeff.dyke at gmail.com  Thu Feb 19 07:10:35 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Thu, 19 Feb 2009 07:10:35 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
Message-ID: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>

Fair enough.  Say my project is called foo, and it has many
submodules.  So there are imports that may look like `import foo.bar`
or `from foo.bar import baz`, if i change the top level directory, it
is no longer foo and then those imports do not work as originally
written.  The way i currently do this  is to create a branch, say
foo2, and create a symbolic link named foo pointing at foo2, after
renaming foo, when i want to work on the branch and remove the link
when i want to work on the head.  This actually works fine, but
thought there may be a better way.

Jeff

On Wed, Feb 18, 2009 at 7:40 PM, andrew cooke <andrew at acooke.org> wrote:
>
> maybe this is just me, but i don't have a clue what your problem is.  what
> does "starting imports all over the place" mean?  what do you mean by
> "retired"?
>
> i use svn with python in exactly the same way as with java (and, i
> thought, in the same way as anyone uses svn with any language; java uses
> the directory structure as a package structure too).
>
> maybe someone else will reply, but if not it might help to explain a
> little more detail.
>
> andrew
>
>
> Jeff Dyke wrote:
>> Hello.  I am curious about different ideas on how you handle branching
>> your python projects.  With some other languages this is trivial, but
>> since python uses these directories as modules and i have the top
>> level module starting imports all over the place, i am wondering what
>> others do.  In the past we had retired the first branch and just moved
>> towards the new, but that is not possible now.
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From andrew at acooke.org  Thu Feb 19 07:20:05 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 09:20:05 -0300 (CLST)
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
Message-ID: <dc429c9d793a09ff7d27bbbd0d6aa4bb.squirrel@acooke.dyndns.org>


Ah, OK.  I have never worked like that.  The only helpful comment I can
think of is that I believe svn will store links correctly (while CVS
doesn't).

However, I do find the whole approach a bit odd.  You seem to be doing
your own versioning "by hand" (having two packages that are equivalent
with different names), where I would leave that to SVN/CVS.  So what I
would do, and what seems to me a more natural way to use version control,
is to branch the entire project (the whole tree), leave the foo module
name the same, and work on two separate projects.  If changes (ie on
modules other than foo) need to be made to both projects I would use
svnmerge to make sure that merges made to one also apply to the other. 
But if that is a common situation then it suggests the other modules might
be better treated as a separate library, with their own project.

On the other hand, svnmerge is a bit of a pain and I can see how your
approach might make more sense (particularly on smaller projects).

Andrew


Jeff Dyke wrote:
> Fair enough.  Say my project is called foo, and it has many
> submodules.  So there are imports that may look like `import foo.bar`
> or `from foo.bar import baz`, if i change the top level directory, it
> is no longer foo and then those imports do not work as originally
> written.  The way i currently do this  is to create a branch, say
> foo2, and create a symbolic link named foo pointing at foo2, after
> renaming foo, when i want to work on the branch and remove the link
> when i want to work on the head.  This actually works fine, but
> thought there may be a better way.
>
> Jeff
>
> On Wed, Feb 18, 2009 at 7:40 PM, andrew cooke <andrew at acooke.org> wrote:
>>
>> maybe this is just me, but i don't have a clue what your problem is.
>> what
>> does "starting imports all over the place" mean?  what do you mean by
>> "retired"?
>>
>> i use svn with python in exactly the same way as with java (and, i
>> thought, in the same way as anyone uses svn with any language; java uses
>> the directory structure as a package structure too).
>>
>> maybe someone else will reply, but if not it might help to explain a
>> little more detail.
>>
>> andrew
>>
>>
>> Jeff Dyke wrote:
>>> Hello.  I am curious about different ideas on how you handle branching
>>> your python projects.  With some other languages this is trivial, but
>>> since python uses these directories as modules and i have the top
>>> level module starting imports all over the place, i am wondering what
>>> others do.  In the past we had retired the first branch and just moved
>>> towards the new, but that is not possible now.
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From google at mrabarnett.plus.com  Thu Feb 19 07:39:42 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 12:39:42 +0000
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>	<mailman.203.1234987578.11746.python-list@python.org>	<gnhqmf$r2b$00$2@news.t-online.com>
	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
Message-ID: <499D530E.4090702@mrabarnett.plus.com>

Dennis Lee Bieber wrote:
> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__peter__ at web.de>
> declaimed the following in comp.lang.python:
> 
>> Steve Holden wrote:
>>
>>> Jervis Whitley wrote:
>>>>> What happens when you have hundreds of megabytes, I don't know.
>>>>>
>>>>>
>>>> I hope I never have to test a word that is hundreds of megabytes long
>>>> for a vowel :)
>>> I see you don't speak German ;-)
>> I tried to come up with a funny way to point out that you're a fool.
>>
>> But because I'm German I failed.
>>
> 	Yeah... the proper language to bemoan is Welsh <G> 
> 
> Where "w" is vowel <G>
> 
So is "y", but then it is in English too, sometimes.


From johnforse at talktalk.net  Thu Feb 19 07:46:52 2009
From: johnforse at talktalk.net (John Forse)
Date: Thu, 19 Feb 2009 12:46:52 +0000
Subject: string to list conversion
Message-ID: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>

I need to convert an input string say 'xxxx' to a list of the form  
['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ;  
list.join() is an error;  and str.join() won't use lists. I do need  
the comma after the string. Is there a simple solution?
Regards
John





From urbangabo at gmail.com  Thu Feb 19 07:50:23 2009
From: urbangabo at gmail.com (Gabor Urban)
Date: Thu, 19 Feb 2009 13:50:23 +0100
Subject: Porting to new Python version
Message-ID: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>

Hi,

I have a tough issue: we are using a Python application written quite
a time ago for version 2.4. The code is mature, and there are no bugs.
 My bosses came up with the idea to port it to the latest release... I
am not really convinced that it's a good step.

I wellcome any information pro and contra. I would like to get the
background as precisely as possible.

Thanks in advance and good day to You!

Gabor


From xng at xs4all.nl  Thu Feb 19 07:50:57 2009
From: xng at xs4all.nl (Martin P. Hellwig)
Date: Thu, 19 Feb 2009 12:50:57 +0000
Subject: Pythonic way to determine if one char of many in a string
In-Reply-To: <mailman.237.1235047183.11746.python-list@python.org>
References: <1234761457.20683.1300568627@webmail.messagingengine.com>	<mailman.17.1234763590.11746.python-list@python.org>	<01aa9ea5$0$20632$c3e8da3@news.astraweb.com>	<mailman.145.1234901288.11746.python-list@python.org>	<pan.2009.02.18.07.55.43@REMOVE.THIS.cybersource.com.au>	<8e63a5ce0902181144q6e5405a2y9b393a34cf4d7d58@mail.gmail.com>	<mailman.203.1234987578.11746.python-list@python.org>	<gnhqmf$r2b$00$2@news.t-online.com>	<_uydneN7BuEGkwDUnZ2dnUVZ_tudnZ2d@earthlink.com>
	<mailman.237.1235047183.11746.python-list@python.org>
Message-ID: <499d55b1$0$188$e4fe514c@news.xs4all.nl>

MRAB wrote:
> Dennis Lee Bieber wrote:
>> On Wed, 18 Feb 2009 21:22:45 +0100, Peter Otten <__peter__ at web.de>
>> declaimed the following in comp.lang.python:
>>
>>> Steve Holden wrote:
>>>
>>>> Jervis Whitley wrote:
>>>>>> What happens when you have hundreds of megabytes, I don't know.
>>>>>>
>>>>>>
>>>>> I hope I never have to test a word that is hundreds of megabytes long
>>>>> for a vowel :)
>>>> I see you don't speak German ;-)
>>> I tried to come up with a funny way to point out that you're a fool.
>>>
>>> But because I'm German I failed.
>>>
>>     Yeah... the proper language to bemoan is Welsh <G>
>> Where "w" is vowel <G>
>>
> So is "y", but then it is in English too, sometimes.

Heh, born and raised in Germany, moved to the Netherlands and now live 
in the UK, speak a bit of French too. No wonder the only language that 
makes actually sense to me is Python.

-- 
mph


From KGeraghty at 360i.com  Thu Feb 19 07:55:37 2009
From: KGeraghty at 360i.com (Kevin Geraghty)
Date: Thu, 19 Feb 2009 07:55:37 -0500
Subject: Creating a request for ZSI 
Message-ID: <C30921E026F4C44EA3333D1B41CA623CC6172EF3BA@IIEXCHMAIN.innovationinteractive.com>

Folks,
I am trying to access a WSDL and I used wsdl2py to create the needed files. My problem is that when I try to create a request object I get a request Holder object instead.

>>> get_rates_by_profile_name=ns0.get_rates_by_profile_name_Dec().pyclass
>>> req=get_rates_by_profile_name()
>>> req._username = username
>>> req._org_id = org_id
>>> req._profile_name = profile_name
>>> req
<HotelWebService_services_types.get_rates_by_profile_name_Holder object at 0xb7c04d8c>

When I try to get a response the isinstance() test rejects the request holder object as being of the wrong type.

>>> resp = portType.get_rates_by_profile_name(req)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "HotelWebService_services.py", line 487, in get_rates_by_profile_name
    raise TypeError, "%s incorrect request type" % (request.__class__)
TypeError: <class 'HotelWebService_services_types.get_rates_by_profile_name_Holder'> incorrect request type

How do I get a req object that ZSI will let me use to get a response?

Thanks
Kevin


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From dstanek at dstanek.com  Thu Feb 19 07:57:37 2009
From: dstanek at dstanek.com (David Stanek)
Date: Thu, 19 Feb 2009 07:57:37 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
Message-ID: <de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:10 AM, Jeff Dyke <jeff.dyke at gmail.com> wrote:
> Fair enough.  Say my project is called foo, and it has many
> submodules.  So there are imports that may look like `import foo.bar`
> or `from foo.bar import baz`, if i change the top level directory, it
> is no longer foo and then those imports do not work as originally
> written.  The way i currently do this  is to create a branch, say
> foo2, and create a symbolic link named foo pointing at foo2, after
> renaming foo, when i want to work on the branch and remove the link
> when i want to work on the head.  This actually works fine, but
> thought there may be a better way.
>
> Jeff
>

I think that your project structure is faulty. In Subversion I do
something like:

* FooProject/trunk/foo
* FooProject/branches/TRY-foo2

TRY-foo2 is an svn cp of trunk so checking out TRY-foo2 gives you a
TRY-foo2 directory containing a foo package. My DVCS projects go
essentially the same thing.


-- 
David
http://www.traceback.org


From oliverpeng at gmail.com  Thu Feb 19 07:57:46 2009
From: oliverpeng at gmail.com (O Peng)
Date: Thu, 19 Feb 2009 04:57:46 -0800 (PST)
Subject: urllib2 httplib.BadStatusLine exception while opening a page on 
	an Oracle HTTP Server
References: <728a06bb-2faa-4a61-b988-ff3d9809aa28@w39g2000prb.googlegroups.com>
	<cea443cd-f2d3-4fb9-83ef-c903122d13ca@l33g2000pri.googlegroups.com>
Message-ID: <54eb2670-6636-41a4-9a6a-d2ba7b3fa158@m29g2000prd.googlegroups.com>

I'm running into a similar problem with the BadStatusLine.
The source code for httplib.py in the problem is as follows:

class HTTPResponse:
    ...
    def _read_status(self):
        line = self.fp.readline()
        ...
        if not line:
            # Presumably, the server closed the connection before
            # sending a valid response.
            raise BadStatusLine(line)

However, I found that right before the 'raise BadStatusLine(line)'
when I ran the following:

restOfResponse = self.fp.read()
print restOfResponse

restOfResponse is NOT empty.  In fact, when I run self.fp.read() at
the beginning of the begin() function, it is not empty at all.
This leads me to believe there is a bug with the self.fp.readline()
(socket._fileobject.readline()) function.  For me it only fails
sometimes.

This behavior is only observed on Windows, Python 2.5.  Running it on
Mac OS X, Python 2.5 yielded no problems.

On Jan 19, 3:48?pm, ak <akte... at gmail.com> wrote:
> On Jan 19, 10:00?pm, ak <akte... at gmail.com> wrote:
>
>
>
> > Hi everyone,
>
> > I have a problem with urllib2 on this particular url, hosted on an
> > Oracle HTTP Server
>
> >http://www.orange.sk/eshop/sk/portal/catalog.html?type=post&subtype=p...
>
> > which gets 302 redirected tohttps://www.orange.sk/eshop/sk/catalog/post/phones.html,
> > after setting a cookie through the Set-Cookie header field in the 302
> > reply. This works fin with firefox.
>
> > However, with urllib2 and the following code snippet, it doesn't work
>
> > --------
> > import cookiejar
> > import urllib2
>
> > cookiejar = cookielib.LWPCookieJar()
> > opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookiejar))
> > url = 'http://www.orange.sk/eshop/sk/portal/catalog.html?
> > type=post&subtype=phone&null'
> > req = urllib2.Request(url, None)
> > s=opener.open(req)
> > --------
>
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > ? File "/usr/lib/python2.5/urllib2.py", line 387, in open
> > ? ? response = meth(req, response)
> > ? File "/usr/lib/python2.5/urllib2.py", line 498, in http_response
> > ? ? 'http', request, response, code, msg, hdrs)
> > ? File "/usr/lib/python2.5/urllib2.py", line 419, in error
> > ? ? result = self._call_chain(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> > ? ? result = func(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 582, in http_error_302
> > ? ? return self.parent.open(new)
> > ? File "/usr/lib/python2.5/urllib2.py", line 381, in open
> > ? ? response = self._open(req, data)
> > ? File "/usr/lib/python2.5/urllib2.py", line 399, in _open
> > ? ? '_open', req)
> > ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> > ? ? result = func(*args)
> > ? File "/usr/lib/python2.5/urllib2.py", line 1115, in https_open
> > ? ? return self.do_open(httplib.HTTPSConnection, req)
> > ? File "/usr/lib/python2.5/urllib2.py", line 1080, in do_open
> > ? ? r = h.getresponse()
> > ? File "/usr/lib/python2.5/httplib.py", line 928, in getresponse
> > ? ? response.begin()
> > ? File "/usr/lib/python2.5/httplib.py", line 385, in begin
> > ? ? version, status, reason = self._read_status()
> > ? File "/usr/lib/python2.5/httplib.py", line 349, in _read_status
> > ? ? raise BadStatusLine(line)
> > httplib.BadStatusLine
>
> > Trying the redirected url directly doesn't work either (trying with
> > Firefox will give an HTML error page, as the cookie is not set yet,
> > but trying with urllib2 gives the same exception as previously,
> > whereas it should return the HTML error page)
> > This works correctly on other urls on this website (http(s)://www.orange.sk).
>
> > Am I doing anything wrong or is this a bug in urllib2 ?
>
> > -- ak
>
> Actually, I was wrong on the last point, this does *not* work onhttps://www.orange.sk(but does onhttp://www.orange.sk). IMHO, this
> means either urllib2 or the server misimplemented HTTPS.
>
> Here's some output with debuglevel=1 :
>
> >>> opener.open(urllib2.Request('http://www.orange.sk/', None, headers))
>
> reply: 'HTTP/1.1 200 OK\r\n'
> header: Date: Mon, 19 Jan 2009 21:44:03 GMT
> header: Server: Oracle-Application-Server-10g/10.1.3.1.0 Oracle-HTTP-
> Server
> header: Set-Cookie:
> JSESSIONID=0a19055a30d630c427bda71d4e26a37ca604b9f590dc.e3eNaNiRah4Pe3aSch8 Sc3yOc40;
> path=/web
> header: Expires: Mon, 19 Jan 2009 21:44:13 GMT
> header: Surrogate-Control: max-age="10"
> header: Content-Type: text/html; charset=ISO-8859-2
> header: X-Cache: MISS fromwww.orange.sk
> header: Connection: close
> header: Transfer-Encoding: chunked
> <addinfourl at 137417292 whose fp = <socket._fileobject object at
> 0x831348c>>
>
> >>> opener.open(urllib2.Request('https://www.orange.sk/', None, headers))
>
> reply: ''
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> ? File "/usr/lib/python2.5/urllib2.py", line 381, in open
> ? ? response = self._open(req, data)
> ? File "/usr/lib/python2.5/urllib2.py", line 399, in _open
> ? ? '_open', req)
> ? File "/usr/lib/python2.5/urllib2.py", line 360, in _call_chain
> ? ? result = func(*args)
> ? File "/usr/lib/python2.5/urllib2.py", line 1115, in https_open
> ? ? return self.do_open(httplib.HTTPSConnection, req)
> ? File "/usr/lib/python2.5/urllib2.py", line 1080, in do_open
> ? ? r = h.getresponse()
> ? File "/usr/lib/python2.5/httplib.py", line 928, in getresponse
> ? ? response.begin()
> ? File "/usr/lib/python2.5/httplib.py", line 385, in begin
> ? ? version, status, reason = self._read_status()
> ? File "/usr/lib/python2.5/httplib.py", line 349, in _read_status
> ? ? raise BadStatusLine(line)
> httplib.BadStatusLine
>
> As you can see the reply from the server seems empty (which results in
> the BadStatusLine exception)
>
> Any help greatly appreciated.
>
> -- ak



From steve at holdenweb.com  Thu Feb 19 07:57:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 07:57:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
Message-ID: <gnjl0m$uoj$1@ger.gmane.org>

rushenaly at gmail.com wrote:
> Thank you for all your answers...
> 
> I think i am going to pick Java instead of Python...
> 
Well, good luck. See what a helpful bunch of people you meet in the
Python world? Glad you found all the advice helpful. Come back when you
want to try Python!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Ron.Barak at lsi.com  Thu Feb 19 08:01:07 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Thu, 19 Feb 2009 13:01:07 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <mailman.36.1235041220.11040.python-list@python.org>
References: <mailman.36.1235041220.11040.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>

Hi,

I have a class derived from two parents (in blue below), which gives me the following error:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 291, in <module>
    class ListControl(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
Googling suggested I should add

from noconflict import classmaker
and

__metaclass__=classmaker()
to this class.

However, I don't seem able to find where to get the noconflict module from.

Do any of you where noconflict  could be downloaded/installed from ?

Thanks,
Ron.

P.S.: I use Windows XP/cygwin, Python 2.5.2, wx-2.8-msw-unicode
-------------- next part --------------
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From Srinivas.Irigi at adaptit.co.za  Thu Feb 19 08:03:51 2009
From: Srinivas.Irigi at adaptit.co.za (Srinivas)
Date: Thu, 19 Feb 2009 15:03:51 +0200
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <200902191503.51851.Srinivas.Irigi@adaptit.co.za>

John,

Try the following code .. hope this helps and solves your problem . I have run 
in the interactive mode
>>> s='xxxx'
>>> a=[s,'12']
>>> print a
['xxxx', '12']


regards
Srinivas




From jeff.dyke at gmail.com  Thu Feb 19 08:05:00 2009
From: jeff.dyke at gmail.com (Jeff Dyke)
Date: Thu, 19 Feb 2009 08:05:00 -0500
Subject: SVN/CVS and Branching
In-Reply-To: <de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>
References: <8496caf30902181444s5deb203ye0ff5654743999f5@mail.gmail.com>
	<a0f521dd8af5748d10efe02e2137c8f6.squirrel@acooke.dyndns.org>
	<8496caf30902190410y3e4d5edcgba846704cab87d13@mail.gmail.com>
	<de32cc030902190457k79baa37ck31728d7cbed6a98d@mail.gmail.com>
Message-ID: <8496caf30902190505i4ff0b990pe8ca5fa13491dce5@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:57 AM, David Stanek <dstanek at dstanek.com> wrote:
> On Thu, Feb 19, 2009 at 7:10 AM, Jeff Dyke <jeff.dyke at gmail.com> wrote:
>> Fair enough.  Say my project is called foo, and it has many
>> submodules.  So there are imports that may look like `import foo.bar`
>> or `from foo.bar import baz`, if i change the top level directory, it
>> is no longer foo and then those imports do not work as originally
>> written.  The way i currently do this  is to create a branch, say
>> foo2, and create a symbolic link named foo pointing at foo2, after
>> renaming foo, when i want to work on the branch and remove the link
>> when i want to work on the head.  This actually works fine, but
>> thought there may be a better way.
>>
>> Jeff
>>
>
> I think that your project structure is faulty. In Subversion I do
> something like:
>
> * FooProject/trunk/foo
> * FooProject/branches/TRY-foo2
>
> TRY-foo2 is an svn cp of trunk so checking out TRY-foo2 gives you a
> TRY-foo2 directory containing a foo package. My DVCS projects go
> essentially the same thing.

I think your correct.  I picked up this habit from someone else and
blindly kept going.

Thanks to both you and Andrew for the comments.  I think i'll work on
making a switch.

>
>
> --
> David
> http://www.traceback.org
>


From n.kottiyath at gmail.com  Thu Feb 19 08:05:39 2009
From: n.kottiyath at gmail.com (Kottiyath)
Date: Thu, 19 Feb 2009 05:05:39 -0800 (PST)
Subject: Porting to new Python version
References: <mailman.239.1235047827.11746.python-list@python.org>
Message-ID: <67b23877-3292-4c99-83e5-244f29b76e58@k36g2000pri.googlegroups.com>

On Feb 19, 5:50?pm, Gabor Urban <urbang... at gmail.com> wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
> ?My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor

It might be helpful if you can provide more information regarding your
application.
For example, does it use lot of 3rd party code, What is the reason
behind porting to latest version etc.
All said, 2.4 to 2.5 or even 2.6 should not be much of an issue - it
even has the advantage that performance is improved and some memory
leaks are no longer there.
Python 3* should be a problem since many 3rd party applications are
not yet ported to it.


From steve at holdenweb.com  Thu Feb 19 08:07:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 08:07:51 -0500
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <gnjlj6$1ga$1@ger.gmane.org>

John Forse wrote:
> I need to convert an input string say 'xxxx' to a list of the form
> ['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ;
> list.join() is an error;  and str.join() won't use lists. I do need the
> comma after the string. Is there a simple solution?

Suppose your input string is s. Just say

s = [s]

Bingo, s is now a list containing the input string as its only element.
But I suspect that's not what you mean ... because you say "I do need
the comma after the string". Do you mean that you want to produce a
string containing "['xxxx', ]"?

You might try

s = "['%s', ]" % s

But that's potentially going to give you problems if s contains either
an apostrophe or a quote mark. It depends how you plan to use it. So
what is it you want, exactly, and (if it's not asking too much) why?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb 19 08:09:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 13:09:53 +0000
Subject: string to list conversion
In-Reply-To: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
References: <D164DA37-3222-47A7-9EE2-0F66249808FD@talktalk.net>
Message-ID: <499D5A21.9000308@mrabarnett.plus.com>

John Forse wrote:
> I need to convert an input string say 'xxxx' to a list of the form 
> ['xxxx' ,]. If I use list(stringname), I get ['x','x','x','x'] ; 
> list.join() is an error;  and str.join() won't use lists. I do need the 
> comma after the string. Is there a simple solution?
> 
Have you tried [stringname], eg ['xxxx' ,]? :-)

Why do you need the comma? Python permits it but it isn't necessary:

 >>> ['xxxx' ,]
['xxxx']


From steve at holdenweb.com  Thu Feb 19 08:10:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 08:10:02 -0500
Subject: Porting to new Python version
In-Reply-To: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
Message-ID: <gnjln9$1ga$2@ger.gmane.org>

Gabor Urban wrote:
> Hi,
> 
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
>  My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
> 
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
> 
> Thanks in advance and good day to You!
> 
As long as you don't plan to migrate to 3.0 you may well be surprised at
how easy the port is. Python's backwards compatibility has been pretty
good. Moving to 3.0 will demand more thought and testing.

One might ask what the advantages are supposed to be, of course, but
generally bosses aren't interested in explaining themselves ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Thu Feb 19 08:12:36 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 10:12:36 -0300 (CLST)
Subject: Porting to new Python version
In-Reply-To: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
Message-ID: <0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>


i don't know what the context is, so it's hard for me to comment on the
decision (i assume there are commerical pressures like customers not
wanting to install old versions).

however,if you go ahead, you need to think about exactly what you want to
target.

the latest version is really 3.0.1.  moving to 3 is probably not that hard
(and there are tools to automate the process).  also, 2.6 is largely
compatible with 3.  so moving to something that works with 2.6 and 3 is
probably a reasonable target.  but that code will not work, without more
significant effort, on 2.5 and earlier.

so one idea would be to keep your existing code for 2.4, and update for 3.
 for some time (years) you will need to support two versions, but if it is
stable then that may not be much work.

alternatively, you could ignore 3, which is not going to be mainstream for
some time, and simply run against 2.6 and 2.5.  that should be even less
work because you're staying with 2.  you could then say that your code
works on 2.4 through 2.6

or, finally, you could do the second step above (to get code that works on
2.4 to 2.6) and then the first step (to get a separate version that works
on 3).  doing things in that order (with staged releases) lets you get
most bug fixes for 2.5/6 into the code before branching for 3.

hope that makes sense.

disclaimer - i have not done the above; this is from reading various
newsgroups and attempting to backport a project written in 3 to 2 (it was
easy to go to 2.6, but i failed to get the same code to run on 2.5).

andrew





Gabor Urban wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
>  My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From andrew at acooke.org  Thu Feb 19 08:20:16 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 10:20:16 -0300 (CLST)
Subject: Porting to new Python version
In-Reply-To: <0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>
References: <f7ac28aa0902190450o29239fdbh72fa6a8a7edfc381@mail.gmail.com>
	<0d42b340554c6ecbfa7fe6f487b8d92c.squirrel@localhost>
Message-ID: <f9993b7d9d9b8a77d5149a4450ad1e61.squirrel@localhost>


maybe i should clarify that "easy" below is going to be relative.  the
process may end up being very hard due to various other reasons.  what i
was trying to explain is that

(1) 3 is probably going to require a separate branch from 2;

(2) that 2.6 and 3 can both be considered "latest";

(3) moving from 2.4 to 2.6 is probably best done before branching for 3;

(4) moving from 2.4 to 2.6 is probably easier than moving from 2 to 3.

andrew


andrew cooke wrote:
>
> i don't know what the context is, so it's hard for me to comment on the
> decision (i assume there are commerical pressures like customers not
> wanting to install old versions).
>
> however,if you go ahead, you need to think about exactly what you want to
> target.
>
> the latest version is really 3.0.1.  moving to 3 is probably not that hard
> (and there are tools to automate the process).  also, 2.6 is largely
> compatible with 3.  so moving to something that works with 2.6 and 3 is
> probably a reasonable target.  but that code will not work, without more
> significant effort, on 2.5 and earlier.
>
> so one idea would be to keep your existing code for 2.4, and update for 3.
>  for some time (years) you will need to support two versions, but if it is
> stable then that may not be much work.
>
> alternatively, you could ignore 3, which is not going to be mainstream for
> some time, and simply run against 2.6 and 2.5.  that should be even less
> work because you're staying with 2.  you could then say that your code
> works on 2.4 through 2.6
>
> or, finally, you could do the second step above (to get code that works on
> 2.4 to 2.6) and then the first step (to get a separate version that works
> on 3).  doing things in that order (with staged releases) lets you get
> most bug fixes for 2.5/6 into the code before branching for 3.
>
> hope that makes sense.
>
> disclaimer - i have not done the above; this is from reading various
> newsgroups and attempting to backport a project written in 3 to 2 (it was
> easy to go to 2.6, but i failed to get the same code to run on 2.5).
>
> andrew
>
>
>
>
>
> Gabor Urban wrote:
>> Hi,
>>
>> I have a tough issue: we are using a Python application written quite
>> a time ago for version 2.4. The code is mature, and there are no bugs.
>>  My bosses came up with the idea to port it to the latest release... I
>> am not really convinced that it's a good step.
>>
>> I wellcome any information pro and contra. I would like to get the
>> background as precisely as possible.
>>
>> Thanks in advance and good day to You!
>>
>> Gabor
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From dikkie at nospam.org  Thu Feb 19 08:30:53 2009
From: dikkie at nospam.org (Dikkie Dik)
Date: Thu, 19 Feb 2009 14:30:53 +0100
Subject: Revision Control
In-Reply-To: <mailman.198.1234977129.11746.python-list@python.org>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
Message-ID: <499d5f0e$0$444$bf4948fe@news.tele2.nl>

Funny how everybody is speaking about the ease of merging. It is the
very least feature I have ever needed from source code control. Most
version control system are really brilliant in creating a version mess
of intertwined branches, but off course I use version control to
*PREVENT* such a mess. So I really would like better linking
possibilities to other projects or standard libraries. That said:

- MS-Source-Safe did a great job here. But I stopped using it after
version 6.0. The linking feature of VSS was great, but the stability of
VSS was awful.

- CVS is a hell. Only administrators seem to be able to create a link.

- Linking is subversion is not exactly user-friendly, but it "kinda"
works. See
http://www.howtoforge.org/set-up-a-modular-svn-repository-for-php-websites
for how I managed to do so with PHP. I don't have a real Python library
yet, but I would use it the same way. Also, the latest subversion should
support relative links.

- I have no experience with mercurial.

- I searched through the documentation of git and bzr, and could not
find much.

If anyone has more info on linking with Mercurial, bzr or git, please
share it!


From lie.1296 at gmail.com  Thu Feb 19 08:42:42 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 19 Feb 2009 13:42:42 +0000 (UTC)
Subject: How to convert between Japanese coding systems?
References: <1235024892.3981.56.camel@pippi.pippi>
Message-ID: <gnjnkh$9o1$1@ger.gmane.org>

On Thu, 19 Feb 2009 15:28:12 +0900, Dietrich Bollmann wrote:

> Hi,
> 
> Are there any functions in python to convert between different Japanese
> coding systems?

If I'm not mistaken, the email standard specifies that only 7-bit ASCII-
encoded bytes can be transported safely and reliably. The highest bit may 
be stripped by email server or client. Thus, to transport non-ASCII data 
safely, they cannot use "regular" encodings (e.g. utf-8, shift-jis, etc). 
I'm not sure what the standard is for Japanese character, but it seems 
that from reading the email header, the encoding used is a modified 
UTF-8. Try checking python's email module, they might have something for 
decoding 7-bit email-utf to 8-bit regular-utf or unicode string.

After decoding the email-utf to regular-utf or unicode string, converting 
to other encoding should be trivial.



From Scott.Daniels at Acm.Org  Thu Feb 19 09:10:54 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 06:10:54 -0800
Subject: Revision Control
In-Reply-To: <499d5f0e$0$444$bf4948fe@news.tele2.nl>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
	<499d5f0e$0$444$bf4948fe@news.tele2.nl>
Message-ID: <L4-dnd0UBNZ9-gDUnZ2dnUVZ_szinZ2d@pdx.net>

Dikkie Dik wrote:
> Funny how everybody is speaking about the ease of merging. It is the
> very least feature I have ever needed from source code control....

Ah yes, but with a distributed VCS, merging becomes _much_ more common.
The model is developers pull, develop (checking in frequently), and
merge back.  Most checkins to the central repository _are_ merges.
That is why everyone talks about merge speed.

--Scott David Daniels
Scott.Daniels at Acm.Org



From mrkafk at gmail.com  Thu Feb 19 09:21:14 2009
From: mrkafk at gmail.com (mk)
Date: Thu, 19 Feb 2009 15:21:14 +0100
Subject: CSV readers and UTF-8 files
Message-ID: <gnjpss$hae$1@ger.gmane.org>

Hello everyone,

Is it just me or CSV reader/DictReader and UTF-8 files do not work 
correctly in Python 2.6.1 (Windows)?

That is, when I open UTF-8 file in a csv reader (after passing plain 
file object), I get fields as plain strings ('str'). Since this has been 
mangled, I can't get the non-ascii characters back.

When I do:

     csvfo = codecs.open(csvfname, 'rb', 'utf-8')
     dl = csv.excel
     dl.delimiter=';'
     #rd = csv.DictReader(csvfo, dialect=dl)
     rd = csv.reader(csvfo, dialect=dl)

..I get plain strings as well (I get <type 'str'> when calling 
type(field)), on top of error:

Traceback (most recent call last):
   File "C:/Python26/converter3.py", line 99, in <module>
     fill_sqla(session,columnlist,rd)
   File "C:/Python26/converter3.py", line 73, in fill_sqla
     for row in rd:
UnicodeEncodeError: 'ascii' codec can't encode character u'\u0144' in 
position 74: ordinal not in range(128)

..when doing:

     for row in rd:
...

Regards,
mk



From notvalid2 at sbcglobal.net  Thu Feb 19 09:22:21 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 06:22:21 -0800
Subject: Which Version of wxPython for Win XP
Message-ID: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>

I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi 
version is the choice for me. The other choice has unicode. Do I care?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From python.list at tim.thechases.com  Thu Feb 19 09:28:53 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 19 Feb 2009 08:28:53 -0600
Subject: Revision Control
In-Reply-To: <499CED12.3040802@mattnordhoff.com>
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>	<ec96e1390902180939s589cdcdy3db4986d0b94cee@mail.gmail.com>
	<499C5521.2040705@tim.thechases.com>
	<499CED12.3040802@mattnordhoff.com>
Message-ID: <499D6CA5.3000802@tim.thechases.com>

> FWIW, Bazaar and Mercurial both have about half a dozen C modules. (Most
> of Bazaar's are Pyrex, though, not straight C.)

Thanks for the update -- it's been about 6 months since I played 
much with Bazaar.  Hopefully these C module help with some of the 
speed issues that plagued bzr in my past experimentations.

> The next release of Mercurial will add support for running without them.
>  (Bazaar already supports that, of course.)

Wonderful to hear...I'd love to be able to install mercurial on 
my web-host's machine, but it's currently not readily possible. 
A pure-python implementation (or at least fallback) will give me 
this option.

Thanks!

-tkc





From michele.simionato at gmail.com  Thu Feb 19 09:32:04 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 19 Feb 2009 06:32:04 -0800 (PST)
Subject: Porting to new Python version
References: <mailman.239.1235047827.11746.python-list@python.org>
Message-ID: <72aa7a5e-195d-45c1-923f-30a2b049f45b@n30g2000vba.googlegroups.com>

On Feb 19, 1:50?pm, Gabor Urban <urbang... at gmail.com> wrote:
> Hi,
>
> I have a tough issue: we are using a Python application written quite
> a time ago for version 2.4. The code is mature, and there are no bugs.
> ?My bosses came up with the idea to port it to the latest release... I
> am not really convinced that it's a good step.
>
> I wellcome any information pro and contra. I would like to get the
> background as precisely as possible.
>
> Thanks in advance and good day to You!
>
> Gabor

I am a fan of smooth upgrades. Just move to Python 2.5 and you should
have little troubles.
You can wait one year or so for Python 2.6. As a rule of thumb, I
think it is safe to upgrade to a newer Python versions after one year
from its first release, to give time to third party packages. There
are of course exceptions. For instance I remember Zope being far
behind Python releases. I have currently a Zope application running in
Python 2.4 that I cannot upgrade. It all depends from your external
dependencies. If you do not have any, and you do not anticipate the
need for any, you can probably upgrade to Python 2.6 with no effort.

 Michele Simionato


From claird at lairds.us  Thu Feb 19 09:33:02 2009
From: claird at lairds.us (Cameron Laird)
Date: Thu, 19 Feb 2009 14:33:02 +0000
Subject: can multi-core improve single funciton?
References: <mailman.9204.1234247299.3487.python-list@python.org>
	<pan.2009.02.10.22.26.39@REMOVE.THIS.cybersource.com.au>
	<39uq66-b7j.ln1@lairds.us>
	<pan.2009.02.18.07.24.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <u57076-llp.ln1@lairds.us>

In article <pan.2009.02.18.07.24.36 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>> 			.
>> 			.
>> 			.
>>>> And now for my version (which admitedly isn't really mine, and returns
>>>> slightly incorrect fib(n) for large values of n, due to the limited
>>>> floating point precision).
>>>
>>>The floating point version is nice, but it starts giving incorrect
>>>answers relatively early, from n=71. But if you don't need accurate
>>>results (a relative error of 3e-15 for n=71), it is very fast.
>> 			.
>> 			.
>> 			.
>> While my personal opinion is that it's silly to characterize an error of
>> 3e-15 as not "accurate", 
>
>That's a *relative* error. The absolute error is 1 for n=71, 59 for n=80, 
>1196093 for n=100, and 1875662300654090482610609259 for n=200. As far as 
>I can tell, the absolute error grows without bounds as n increases -- and 
>it overflows at n=1475.
>
>I agree that a relative error is small, and if your use allows it, then 
>by all means use the inexact floating point function. But if you need 
>exact results, then you won't get it using floats.
>
>
>
>> I think more constructive is to focus on the
>> fact that the closed-form solution can be touched up to give a precise
>> integral solution, while re- taining its (approximately) O(log n)
>> run-time cost.
>
>I doubt that. Since both phi and sqrt(5) are irrational numbers, it would 
>require an infinite number of integer digits to get precise integral 
>solutions unless there was some sort of freakish cancellation. But you 
>probably could get a very good integral solution which gives exact 
>results up to whatever limit you wanted, bound only by the amount of 
>memory and time you were willing to spend.
			.
			.
			.
There *is* freakish cancellation.

I entirely recognize that Python builds in floating-point
calculations of limited precision.  The closed-form expres-
sion for Fibonacci, though, is exact, and can be coded in
terms of, for example, Python infinite-precision integers.
If there's sufficient interest, I'll cheerfully do so, al-
though only after meeting my own deadlines for February
for commitments outside comp.lang.python.


From fabiofz at gmail.com  Thu Feb 19 09:38:45 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 19 Feb 2009 11:38:45 -0300
Subject: Why deepcopy with class with __getattr__ makes the tracing go nuts?
Message-ID: <cfb578b20902190638x57dba665l9cc80a98496747c7@mail.gmail.com>

Anyone has any idea why the code attached does not work?

Basically, after doing the deepcopy of the class that has __getattr__
overridden, the python tracing facilities don't seem to work anymore.

In the code-attached, if the deepcopy is removed, all works as
expected (or if __deepcopy__ is overridden too).

Thanks,

Fabio

p.s. I've discovered this while trying to debug a real-world
application and the debugger stopped working after making that
deepcopy.
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From roy at panix.com  Thu Feb 19 09:57:05 2009
From: roy at panix.com (Roy Smith)
Date: Thu, 19 Feb 2009 09:57:05 -0500
Subject: Revision Control
References: <822B0E83D23291469317E3432468743702224B@production.2000soft.com>
	<mailman.198.1234977129.11746.python-list@python.org>
	<499d5f0e$0$444$bf4948fe@news.tele2.nl>
Message-ID: <roy-168A45.09570519022009@news.panix.com>

In article <499d5f0e$0$444$bf4948fe at news.tele2.nl>,
 Dikkie Dik <dikkie at nospam.org> wrote:

> Funny how everybody is speaking about the ease of merging. It is the
> very least feature I have ever needed from source code control. 

It depends on what you're doing.  In a big commercial project, sometimes 
you don't have the luxury of just continuing to work on the latest.  You 
have to maintain multiple branches.  When big customers refuse to upgrade, 
you're stuck with maintaining old stuff, and then good merge tools become 
essential.


From alan.isaac at gmail.com  Thu Feb 19 10:20:25 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 15:20:25 GMT
Subject: block dynamic attribute creation
In-Reply-To: <mailman.232.1235034007.11746.python-list@python.org>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>	<mailman.217.1234998934.11746.python-list@python.org>	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<mailman.232.1235034007.11746.python-list@python.org>
Message-ID: <ZMenl.405$Ez6.355@nwrddc02.gnilink.net>

>>        if hasattr(self, attr): #update val
>>          self.__dict__[attr] = val


On 2/19/2009 3:54 AM Gabriel Genellina apparently wrote:
> In particular, your code prevents using class attributes as a default
> value for instance attributes

Doesn't the above allow that?

Thanks,
Alan


From james at agentultra.com  Thu Feb 19 10:28:52 2009
From: james at agentultra.com (J Kenneth King)
Date: Thu, 19 Feb 2009 07:28:52 -0800
Subject: Musings: Using decorators to reduce duplicate exception handling
References: <mailman.207.1234992848.11746.python-list@python.org>
Message-ID: <87zlgitphn.fsf@agentultra.com>

Cameron Simpson <cs at zip.com.au> writes:

> On 17Feb2009 15:12, J Kenneth King <james at agentultra.com> wrote:
> | I recently started a project called TracShell
> | (http://code.google.com/p/tracshell) where I make heavy use of the
> | xmlrpclib core module.
> | 
> | When the number of RPC calls was small, wrapping each call in try/except
> | was acceptable. [...]
> | To combat the duplication, my clever idea was to use a function
> | decorator to wrap any function that used xmlrpclib calls:
> | def catch_errors(fn):
> [...]
> | Maybe I could rename the decorator to something meaningful, but besides
> | that it works pretty well. Now any function I write in my class that
> | uses RPC calls can be wrapped by this decorator and have the exception
> | handling done in a uniform way for these particular exceptions.
>
> My Python fu is still weak, but I had a similar issue last year and
> wrote a context manager, used thus:
>
>   with NoExceptions(handler):
>       ... do stuff that may break ...
>
> The constructor takes a handleException argument (which may be None, but it
> has to be explicit) to tune which exceptions are caught; default is
> everything. This was for a daemon thread that did RPC calls, so it was
> actually fairly important to never die; normally you'd want to catch only
> specific exceptions.
>
> Code:
>
>   class NoExceptions(object):
>       ''' A context manager to catch _all_ exceptions and log them.
>           Arguably this should be a bare try...except but that's syntacticly
>           noisy and separates the catch from the top.
>       '''
>
>       def __init__(self, handleException):
>           ''' Initialise the NoExceptions context manager.
>               The handleException is a callable which
>               expects (exc_type, exc_value, traceback)
>               and returns True or False for the __exit__
>               method of the manager.
>               If handleException is None, the __exit__ method
>               always returns True, suppressing any exception.
>           '''
>           self.__handler = handleException
>
>       def __enter__(self):
>           pass
>
>       def __exit__(self, exc_type, exc_value, traceback):
>           if self.__handler is not None:
>               return self.__handler(exc_type, exc_value, traceback)
>           if exc_type is not None:
>               print >>sys.stderr, "ignore %s" % (exc_type,)
>           return True
>
> It doesn't actually solve your duplication issue and is a bit of a niche
> application, but it's a lot shorter than an inline try/except and to my eye
> reads a little better, and it keeps the exception handling up front at the
> calling end where it is visible.
>
> Cheers,

Ah, that's pretty interesting. I've found a couple other decorator-style
recipes in the cookbooks online (http://code.activestate.com/recipes/408937/).

I think you see my point: every single RPC call needs to be caught just
in case because they are so volatile -- yet you're always looking for
the exact same exception everywhere... too noisy to have inline
try/except. I wonder if there are other use cases where Python
developers have found the need to abstract away repetitive exception
handling.

I think this is the first I've seen the newer Python context managers
being used (though it sneakily looks a lot like what Lisp calls,
"unwind-protect"). Neat idea.


From rushenaly at gmail.com  Thu Feb 19 10:39:01 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 07:39:01 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
Message-ID: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>

Thank you Steve,

I really wanted to learn python, but as i said i don't want to make a
dead investment. I hope someone can fix these design errors and maybe
can write an interpreter in python :)

Thank you so much great community...
Rushen


From __peter__ at web.de  Thu Feb 19 10:39:42 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 16:39:42 +0100
Subject: Why deepcopy with class with __getattr__ makes the tracing go
	nuts?
References: <mailman.254.1235054333.11746.python-list@python.org>
Message-ID: <gnjufq$rij$03$1@news.t-online.com>

Fabio Zadrozny wrote:

> Anyone has any idea why the code attached does not work?
> 
> Basically, after doing the deepcopy of the class that has __getattr__
> overridden, the python tracing facilities don't seem to work anymore.
> 
> In the code-attached, if the deepcopy is removed, all works as
> expected (or if __deepcopy__ is overridden too).
> 
> Thanks,
> 
> Fabio
> 
> p.s. I've discovered this while trying to debug a real-world
> application and the debugger stopped working after making that
> deepcopy.

The problem seems to be a recursion error that implicitly switches off
tracing:

$ cat trace_test.py
import sys

def blowup():
    blowup()

def f():
    print "f called"

def trace(frame, event, arg):
    try:
        if frame.f_code.co_name == 'f':
            print "f seen", event
    finally:
        return trace

sys.settrace(trace)

if "-b" in sys.argv:
    try:
        blowup()
    except:
        pass

f()

$ python trace_test.py
f seen call
f seen line
f called
f seen return

$ python trace_test.py -b
f called

deepcopy() probably triggers such a recursion by accessing the type_name
attribute on a CppType instance with an empty __dict__. You can fix that
with

    def __getattr__(self, attr):
        if attr == 'type_name':
            return super(CppType, self).__getattr__(attr)
        # ...

I don't know why the exception is caught silently, nor how to make tracing
survive the stack overflow.

Peter


From digitig at gmail.com  Thu Feb 19 10:59:36 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 15:59:36 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <aee48b3c0902190759h1eea144pa8ba90c0a92690f8@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Thank you Steve,
>
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Good luck with Java, and with your search for a perfect language. I
think it will be a long search.

-- 
Tim Rowe


From Eric_Dexter at msn.com  Thu Feb 19 11:03:13 2009
From: Eric_Dexter at msn.com (Eric_Dexter at msn.com)
Date: Thu, 19 Feb 2009 08:03:13 -0800 (PST)
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
Message-ID: <b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>

On Feb 19, 8:22?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
> version is the choice for me. The other choice has unicode. Do I care?
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>


There is a good chance you don't care...  I think the other is for
internationalization...  best to look..  It would be easier to answer
the question if you said what you are going to do with it, and who
needed to use your software.  It's even possible that you might want
to try pygame depending on what you want to use it for and who the
audience is (and how good thier computers are)

http://pypi.python.org/simple/Dex%20Tracker/


From lists at cheimes.de  Thu Feb 19 11:08:32 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 19 Feb 2009 17:08:32 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <gnk060$c3r$1@ger.gmane.org>

rushenaly at gmail.com schrieb:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Good luck with Java! You have just traded one "design flaw" for another,
more fatal design error. Please read this paper from a Berkely professor
for CS why people think that threads are evil and not the right solution
for concurrency on multi core systems.
http://www.eecs.berkeley.edu/Pubs/TechRpts/2006/EECS-2006-1.pdf

Quote:
[...] non-trivial multi-threaded programs are incomprehensible for humans.

HTH
Christian



From rushenaly at gmail.com  Thu Feb 19 11:10:56 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 08:10:56 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.256.1235059179.11746.python-list@python.org>
Message-ID: <cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>

Thank you Tim...

It is not a search for perfect language. It is a search for a capable
language to modern worlds' needs.

Rushen


From garrickp at gmail.com  Thu Feb 19 11:11:16 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 08:11:16 -0800 (PST)
Subject: CSV readers and UTF-8 files
References: <mailman.252.1235053288.11746.python-list@python.org>
Message-ID: <59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>

On Feb 19, 7:21?am, mk <mrk... at gmail.com> wrote:
> Hello everyone,
>
> Is it just me or CSV reader/DictReader and UTF-8 files do not work
> correctly in Python 2.6.1 (Windows)?

I would point out in the CSV module documentation (http://
docs.python.org/library/csv.html) it explicitly mentions that it can't
handle unicode.

You can use their workaround in the examples section for UTF-8, or
with another form of encoding (I used MIME) for UTF-16.

~G


From Eric_Dexter at netzero.net  Thu Feb 19 11:13:39 2009
From: Eric_Dexter at netzero.net (Eric_Dexter at netzero.net)
Date: Thu, 19 Feb 2009 08:13:39 -0800 (PST)
Subject: PyGTK install
References: <ac597662-54b7-4726-b4fe-67424f8464e2@w39g2000prb.googlegroups.com>
	<5e6ed314-3625-4a1a-b357-b27aabeb2f52@q30g2000prq.googlegroups.com> 
	<8ff4616a-ef10-4b57-937b-71402d97942d@z28g2000prd.googlegroups.com> 
	<1198ef28-b2c0-4464-85ad-31798dc0c33f@r15g2000prh.googlegroups.com>
Message-ID: <a60a29d2-5ff0-4153-a2dd-7606b71a553f@n2g2000vba.googlegroups.com>

On Feb 18, 5:12?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 3:03?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 2:08?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 18, 11:43?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Hello folks, I couldn't find a specific PyGTK forum so I thought I'd
> > > > post here and hope someone new the answer. I feel it's a silly
> > > > problem, maybe something to do with a path variable? The problem: I've
> > > > downloaded the "all-in-one" windows binary installer for PyGTK from
> > > > their website. After typing in their first tutorial program and trying
> > > > to run from the command line, I get:
>
> > > > "This application has failed to start because libglib-2.0-0.dll was
> > > > not found" error dialog.
>
> > > > The traceback indicates this is happening at the "import gtk" line. A
> > > > quick search of my install directory for PyGTK indicates that the file
> > > > is indeed resident and located in C:\Program files\PyGTK\GTK\bin.
>
> > > > Is there some some sort of path variable for Python I need to modify
> > > > and, if so, how is this done? Thanks so much, and my apologies if this
> > > > is the wrong forum.
>
> > > > -L
>
> > > Well, I tried uninstalling / reinstalling PyGTK and now I'm getting a
> > > different traceback error:
>
> > > "ImportError: no module named pygtk"
>
> > > I checked and pygtk.py is located in "c:\Python25\Lib\site-packages".
> > > Then I displaye the sys.path:
>
> > > IDLE 1.2>>> import sys
> > > >>> sys.path
>
> > > ['C:\\Program Files\\PyGTK\\Python\\Lib\\idlelib', 'C:\\Program Files\
> > > \PyGTK\\Python\\python25.zip', 'C:\\Program Files\\PyGTK\\Python\
> > > \DLLs', 'C:\\Program Files\\PyGTK\\Python\\lib', 'C:\\Program Files\
> > > \PyGTK\\Python\\lib\\plat-win', 'C:\\Program Files\\PyGTK\\Python\\lib\
> > > \lib-tk', 'C:\\Program Files\\PyGTK\\Python', 'C:\\Program Files\\PyGTK
> > > \\Python\\lib\\site-packages']
>
> > > Every single entry is related to PyGTK and nothing else. Something
> > > seems wrong here but I don't have enough Python experience to know
> > > just what. Anyone?- Hide quoted text -
>
> > > - Show quoted text -
>
> > Okay, out of desperation and frustration I've wiped my Python/SciPy/
> > etc.. setup and reinstalled from scratch. I've tested it with my app
> > and all the numpy and matplotlib functionality is there and working.
> > My sys.path seems to be back to normal:
>
> > IDLE 1.2.4>>> import sys
> > >>> sys.path
>
> > ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> > 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> > win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> > \site-packages']
>
> > I will now re-install PyGTK and see if it mysteriously decides to work
> > this time.- Hide quoted text -
>
> > - Show quoted text -
>
> Nope. Now I'm getting:
>
> "The applciation has failed to start because MSVCR80.dll was not
> found."
>
> Don't know what else to try here. Anyone have any ideas?- Hide quoted text -
>
> - Show quoted text -

you can try downloading an older version...  I haven't updated mine
for over a year.  I am using the version that goes with python 2.5 and
windows (I perfer to try wxwindows first usualy..) and it seems to
work o.k. ....  I don't know if that will help or not..


From tim.wintle at teamrubber.com  Thu Feb 19 11:37:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 16:37:49 +0000
Subject: os.fdopen giving "Invalid Argument" from pipes
Message-ID: <1235061469.22757.33.camel@tim-laptop>

Was wondering if someone could point out what the stupid thing I'm doing
wrong is:


{{{
import os, time
def run_multi_proc():
    server_send, logger_recieve = os.pipe()
    pid = os.fork()
    if pid == 0:
        # we are the logger
        #os.close(server_send)
        logger_recieve = os.fdopen(logger_recieve)
        time.sleep(20)
    else:
        # we are the server
        #os.close(logger_recieve)
        server_send = os.fdopen(server_send,"w")
        time.sleep(3)
        os.kill(pid,signal.SIGTERM)

if __name__ == "__main__":
    run_multi_proc()
}}}


> python test.py

Traceback (most recent call last):
  File "test.py", line 20, in <module>
    run_multi_proc()
  File "test.py", line 9, in run_multi_proc
    logger_recieve = os.fdopen(logger_recieve)
OSError: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "test.py", line 20, in <module>
    run_multi_proc()
  File "test.py", line 15, in run_multi_proc
    server_send = os.fdopen(server_send,"w")
OSError: [Errno 22] Invalid argument


really confused about why this isn't working - running on Linux with
python 2.5.2

Tim W



From notvalid2 at sbcglobal.net  Thu Feb 19 11:38:07 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 08:38:07 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
Message-ID: <0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>

Eric_Dexter at msn.com wrote:
> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>> version is the choice for me. The other choice has unicode. Do I care?
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> 
> There is a good chance you don't care...  I think the other is for
> internationalization...  best to look..  It would be easier to answer
> the question if you said what you are going to do with it, and who
> needed to use your software.  It's even possible that you might want
> to try pygame depending on what you want to use it for and who the
> audience is (and how good thier computers are)
> 
> http://pypi.python.org/simple/Dex%20Tracker/
Thanks. I think I'll take the chance. Somewhat simple programming.
Off I go to install it. It can always be un-installed.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From digitig at gmail.com  Thu Feb 19 11:48:52 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 16:48:52 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.256.1235059179.11746.python-list@python.org>
	<cae17314-9c52-4da3-96d4-03676e0405dd@f20g2000yqg.googlegroups.com>
Message-ID: <aee48b3c0902190848m2eee1e0fgbac0884ba279627@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Thank you Tim...
>
> It is not a search for perfect language. It is a search for a capable
> language to modern worlds' needs.

That would be just about any of the ones you mentioned, then. Unless
you mean the needs of a specific project, in which case the
suitability will depend on the project.

-- 
Tim Rowe


From exarkun at divmod.com  Thu Feb 19 11:50:04 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 19 Feb 2009 11:50:04 -0500
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <1235061469.22757.33.camel@tim-laptop>
Message-ID: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>

On Thu, 19 Feb 2009 16:37:49 +0000, Tim Wintle <tim.wintle at teamrubber.com> wrote:
>Was wondering if someone could point out what the stupid thing I'm doing
>wrong is:
>
>
>{{{
>import os, time
>def run_multi_proc():
>    server_send, logger_recieve = os.pipe()

You got server_send and logger_receive backwards (also, i before e *except* after c et cetera).  Flip 'em around and all is well.

>    pid = os.fork()
>    if pid == 0:
>        # we are the logger
>        #os.close(server_send)
>        logger_recieve = os.fdopen(logger_recieve)
>        time.sleep(20)
>    else:
>        # we are the server
>        #os.close(logger_recieve)
>        server_send = os.fdopen(server_send,"w")
>        time.sleep(3)
>        os.kill(pid,signal.SIGTERM)
>
>if __name__ == "__main__":
>    run_multi_proc()
>}}}
>
>
>> python test.py
>
>Traceback (most recent call last):
>  File "test.py", line 20, in <module>
>    run_multi_proc()
>  File "test.py", line 9, in run_multi_proc
>    logger_recieve = os.fdopen(logger_recieve)
>OSError: [Errno 22] Invalid argument
>Traceback (most recent call last):
>  File "test.py", line 20, in <module>
>    run_multi_proc()
>  File "test.py", line 15, in run_multi_proc
>    server_send = os.fdopen(server_send,"w")
>OSError: [Errno 22] Invalid argument
>
>
>really confused about why this isn't working - running on Linux with
>python 2.5.2

Jean-Paul


From tim.wintle at teamrubber.com  Thu Feb 19 11:53:25 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 16:53:25 +0000
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
References: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
Message-ID: <1235062405.22757.35.camel@tim-laptop>

On Thu, 2009-02-19 at 11:50 -0500, Jean-Paul Calderone wrote:
> You got server_send and logger_receive backwards 

Doh!

> (also, i before e *except* after c et cetera).  Flip 'em around and
> all is well.

Thanks - never was great at speling :-)

Tim



From sturlamolden at yahoo.no  Thu Feb 19 11:55:00 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Thu, 19 Feb 2009 08:55:00 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>

On Feb 19, 4:39?pm, rushen... at gmail.com wrote:

> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)

Java and Python has different strengths and weaknesses. There is no
such thing as "the perfect language". It all depends on what you want
to do.

Just be aware that scientists and engineers who need parallel
computers do not use Java or C#. A combination of a scripting language
with C or Fortran seems to be preferred. Popular scripting languages
numerical computing include Python, R, IDL, Perl, and Matlab.

You will find that in the Java community, threads are generally used
for other tasks than parallel computing, and mainly asynchronous I/O.
Java does not have a GIL, nor does Jython or Microsoft's IronPython.
But if you use threads for I/O, the GIL does not matter. Having more
than one CPU does not make your harddisk or network connection any
faster. The GIL does not matter before crunching numbers on the CPU
becomes the bottleneck. And when you finally get there, perhaps it is
time to look into some C programming? Those that complain about
CPython's GIL (or the GIL of Perl/PHP/Ruby for that matter) seem to be
developers who have no or little experience with parallel computers.
Yes, the GIL prevents Python threads from being used in a certain way.
But do you really need to use threads like that? Or do you just think
you do?

S.M.


From R.Brodie at rl.ac.uk  Thu Feb 19 12:07:33 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Thu, 19 Feb 2009 17:07:33 -0000
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
Message-ID: <gnk3km$e9b$1@south.jnrs.ja.net>


"sturlamolden" <sturlamolden at yahoo.no> wrote in message 
news:d544d846-15ac-446e-a77f-cede8fcf9f27 at m40g2000yqh.googlegroups.com...

> The GIL does not matter before crunching numbers on the CPU
> becomes the bottleneck. And when you finally get there, perhaps it is
> time to look into some C programming?

Or numpy on a 512 core GPGPU processor, because using the CPU
for crunching numbers is just *so* dated. ;) 




From Tribulations at Paralleles.invalid  Thu Feb 19 12:15:15 2009
From: Tribulations at Paralleles.invalid (TP)
Date: Thu, 19 Feb 2009 18:15:15 +0100
Subject: setattr question
Message-ID: <3mg076-fl5.ln1@rama.fbx.proxad.net>

Hi everybody,

I try to make a "link" (or shortcut, if you want) so that len(b_instance)
computes in fact len(a) (see the code below). I could write a method
__len__ to b, but I wonder if it is possible to make it with a
setattr/getattr trick, as I do below.

Thanks in advance,

Julien

######################
class b( object ):

    def __init__( self ):

        super( b, self ).__init__()

a = [5,4,7]
b_instance = b()

setattr( b_instance, "__len__", getattr( a, "__len__") )
print len( a )
print id( a.__len__ )
print hasattr( b_instance, "__len__" )
print id( b.__len__ )
print len( b_instance )
########################

I obtain:
$ p test_setattr.py
3
3083822540
True
Traceback (most recent call last):
  File "test_setattr.py", line 14, in <module>
    print id( b.__len__ )
AttributeError: type object 'b' has no attribute '__len__'
        Command failure: error 1 !


-- 
python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\
9&1+,\'Z4(55l4('])"

"When a distinguished but elderly scientist states that something is
possible, he is almost certainly right. When he states that something is
impossible, he is very probably wrong." (first law of AC Clarke)


From amgusarov at gmail.com  Thu Feb 19 12:17:56 2009
From: amgusarov at gmail.com (Alex Gusarov)
Date: Thu, 19 Feb 2009 23:17:56 +0600
Subject: Search in list of dictionaries
Message-ID: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>

 Hello everybody!

I've a list of dictionaries with 'shorcut' and 'command' keys. When user
types a word program must search this list for a typed shortcut and then run
linked command. What I've wrote:

        for cmd in self.commands:
            if cmd['shortcut'] == input:
                os.popen(cmd['command'])
                break
        else:
            os.popen(input)

But it's a brute-force method and I think there is another way in searching
items through a list by dictionary key. Please give me advice how can I
implement fast search in list of dictionaries by some dictionary key. In my
mind language:

list.get({'shortcut' == input})

Thanks a lot, Alex
-------------- next part --------------
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From hellyj at ucsd.edu  Thu Feb 19 12:28:42 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 09:28:42 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<a49e45f50902171443x5c2205cdj4c079785bf28e80d@mail.gmail.com>
Message-ID: <3BD0C017-E443-4E46-9BFE-3B399686CB5D@ucsd.edu>

Hi Miles.
Same result from that as well.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 17, 2009, at 2:43 PM, Miles wrote:

On Mon, Feb 16, 2009 at 8:35 PM, Helly John J. wrote:
> However, when I run python and try to import gdal, this is what  
> happens:
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import gdal
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named gdal

What about "from osgeo import gdal"?

-Miles
--
http://mail.python.org/mailman/listinfo/python-list



From notvalid2 at sbcglobal.net  Thu Feb 19 12:29:22 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 09:29:22 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
Message-ID: <Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>

W. eWatson wrote:
> Eric_Dexter at msn.com wrote:
>> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>>> version is the choice for me. The other choice has unicode. Do I care?
>>> -- 
>>>                                 W. eWatson
>>>
>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>
>>>                      Web Page: <www.speckledwithstars.net/>
>>
>>
>> There is a good chance you don't care...  I think the other is for
>> internationalization...  best to look..  It would be easier to answer
>> the question if you said what you are going to do with it, and who
>> needed to use your software.  It's even possible that you might want
>> to try pygame depending on what you want to use it for and who the
>> audience is (and how good thier computers are)
>>
>> http://pypi.python.org/simple/Dex%20Tracker/
> Thanks. I think I'll take the chance. Somewhat simple programming.
> Off I go to install it. It can always be un-installed.
> 
Well, that was an interesting experience. It appears to have recompiled a 
lot of stuff, and probably some libraries. IDLE is still with me as the way 
to open py files. Apparently, if I want to get around IDLE, I may have to 
install some other editor.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From hellyj at ucsd.edu  Thu Feb 19 12:30:29 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 09:30:29 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
Message-ID: <F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>

Hi Philip.
I installed the 2.5.4 binary from the python.org site.  I did this  
because NumPy and SciPy currently only work with 2.5 and the system  
version was 2.4.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 17, 2009, at 12:30 PM, Philip Semanchuk wrote:


On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:

> Hi.
>
> I'm a newbie to python and am running:
>
> OS X 10.5.6
> Python 2.5.4

Hi John,
Are you using the system Python or have you installed another version?

Cheers
Philip




>
>
> and have run easy_install for gdal like this:
>
> /Library/Python/2.5/site-packages>sudo easy_install GDAL
> Password:
> Searching for GDAL
> Best match: GDAL 1.6.0
> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> GDAL 1.6.0 is already the active version in easy-install.pth
>
> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> i386.egg
> Processing dependencies for GDAL
> Finished processing dependencies for GDAL
>
> However, when I run python and try to import gdal, this is what  
> happens:
>
> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import gdal
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ImportError: No module named gdal
> >>>
>
> Clearly, it's not being found but I don't understand how to debug  
> this any further.  I have the *.egg in the site-packages directory  
> but don't understand if there is something else I have to do to make  
> it usable.  Any help would be much appreciated.
> Cheers.
> --------------
> John Helly, University of California, San Diego
> San Diego Supercomputer Center,  Mail Code 0527
> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
> and Physical Oceanography, Mail Code 0224
> 9500 Gilman Dr., La Jolla CA 92093
> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
> URL (http://www.sdsc.edu/~hellyj)
>
> --
> http://mail.python.org/mailman/listinfo/python-list

--
http://mail.python.org/mailman/listinfo/python-list



From lionel.keene at gmail.com  Thu Feb 19 12:34:43 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 09:34:43 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com>
Message-ID: <e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com>

On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > Thanks Carl, I like your solution. Am I correct in my understanding
> > that memory is allocated at the slicing step in your example i.e. when
> > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > is constructed that memmaps the entire file. Some relatively small
> > amount of memory is allocated for the memmap operation, but the bulk
> > memory allocation occurs when I generate my final numpy sub-array by
> > slicing, and this accounts for the memory efficiency of using memmap?
>
> No, what accounts for the memory efficienty is there is no bulk
> allocation at all. ?The ndarray you have points to the memory that's
> in the mmap. ?There is no copying data or separate array allocation.
>
> Also, it's not any more memory efficient to use the offset parameter
> with numpy.memmap than it is to memmap the whole file and take a
> slice.
>
> Carl Banks

Does this mean that everytime I iterate through an ndarray that is
sourced from a memmap, the data is read from the disc? The sliced
array is at no time wholly resident in memory? What are the
performance implications of this?


From __peter__ at web.de  Thu Feb 19 12:38:46 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 18:38:46 +0100
Subject: setattr question
References: <3mg076-fl5.ln1@rama.fbx.proxad.net>
Message-ID: <gnk5f2$qir$01$1@news.t-online.com>

TP wrote:

> Hi everybody,
> 
> I try to make a "link" (or shortcut, if you want) so that len(b_instance)
> computes in fact len(a) (see the code below). I could write a method
> __len__ to b, but I wonder if it is possible to make it with a
> setattr/getattr trick, as I do below.
> 
> Thanks in advance,
> 
> Julien
> 
> ######################
> class b( object ):
> 
>     def __init__( self ):
> 
>         super( b, self ).__init__()
> 
> a = [5,4,7]
> b_instance = b()
> 
> setattr( b_instance, "__len__", getattr( a, "__len__") )

Invoking setattr() or getattr() with a constant name is bogus. The above can
be written as

b_instance.__len__ = a.__len__

> print len( a )
> print id( a.__len__ )
> print hasattr( b_instance, "__len__" )
> print id( b.__len__ )
> print len( b_instance )
> ########################
> 
> I obtain:
> $ p test_setattr.py
> 3
> 3083822540
> True
> Traceback (most recent call last):
>   File "test_setattr.py", line 14, in <module>
>     print id( b.__len__ )
> AttributeError: type object 'b' has no attribute '__len__'
>         Command failure: error 1 !
> 

__special__ methods in newstyle classes are looked up in the class, not the
instance: 

>>> class B(object): pass
...
>>> items = [1,2,3]
>>> b = B()
>>> len(b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object of type 'B' has no len()
>>> B.__len__ = items.__len__
>>> len(b)
3

Now that doesn't make much sense because all instances of B now share the
same length. If you want a useful per-instance length function you have to
delegate:

>>> class B(object):
...     def __len__(self): return self._len()
...
>>> a = B()
>>> b = B()
>>> a._len = [1,2,3].__len__
>>> b._len = [].__len__
>>> len(a), len(b)
(3, 0)

Peter



From google at mrabarnett.plus.com  Thu Feb 19 12:39:04 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 17:39:04 +0000
Subject: Search in list of dictionaries
In-Reply-To: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
References: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
Message-ID: <499D9938.5010207@mrabarnett.plus.com>

Alex Gusarov wrote:
> Hello everybody!
> 
> I've a list of dictionaries with 'shorcut' and 'command' keys. When user 
> types a word program must search this list for a typed shortcut and then 
> run linked command. What I've wrote:
> 
>         for cmd in self.commands:
>             if cmd['shortcut'] == input:
>                 os.popen(cmd['command'])
>                 break
>         else:
>             os.popen(input)
> 
> But it's a brute-force method and I think there is another way in 
> searching items through a list by dictionary key. Please give me advice 
> how can I implement fast search in list of dictionaries by some 
> dictionary key. In my mind language:
> 
> list.get({'shortcut' == input})
> 
If want to go from the shortcut to the command (cmd['shortcut'] ->
cmd['command']) the quickest way is using a dict, where cmd['shortcut']
is the key and cmd['command'] is the value:

     self.command_dict = {}
     for cmd in self.commands:
         self.command_dict[cmd['shortcut']] = cmd['command']

and then:

     os.popen(self.command_dict[input])

This will raise a KeyError if it's unknown. The equivalent of your code
above is:

     os.popen(self.command_dict.get(input, input))


From pavlovevidence at gmail.com  Thu Feb 19 12:51:57 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 09:51:57 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com>
Message-ID: <10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com>

On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > that memory is allocated at the slicing step in your example i.e. when
> > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > is constructed that memmaps the entire file. Some relatively small
> > > amount of memory is allocated for the memmap operation, but the bulk
> > > memory allocation occurs when I generate my final numpy sub-array by
> > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > No, what accounts for the memory efficienty is there is no bulk
> > allocation at all. ?The ndarray you have points to the memory that's
> > in the mmap. ?There is no copying data or separate array allocation.
>
> Does this mean that everytime I iterate through an ndarray that is
> sourced from a memmap, the data is read from the disc? The sliced
> array is at no time wholly resident in memory? What are the
> performance implications of this?

Ok, sorry for the confusion.  What I should have said is that there is
no bulk allocation *by numpy* at all.  The call to mmap does allocate
a chunk of RAM to reflect file contents, but the numpy arrays don't
allocate any memory of their own: they use the same memory as was
allocated by the mmap call.


Carl Banks


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 12:52:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 15:52:13 -0200
Subject: block dynamic attribute creation
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<mailman.232.1235034007.11746.python-list@python.org>
	<ZMenl.405$Ez6.355@nwrddc02.gnilink.net>
Message-ID: <op.upl09b1fx6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 13:20:25 -0200, Alan G Isaac <alan.isaac at gmail.com>  
escribi?:

>>>        if hasattr(self, attr): #update val
>>>          self.__dict__[attr] = val

> On 2/19/2009 3:54 AM Gabriel Genellina apparently wrote:
>> In particular, your code prevents using class attributes as a default
>> value for instance attributes
>
> Doesn't the above allow that?

Sorry, yes, sure!


-- 
Gabriel Genellina



From amgusarov at gmail.com  Thu Feb 19 12:53:19 2009
From: amgusarov at gmail.com (Alex Gusarov)
Date: Thu, 19 Feb 2009 23:53:19 +0600
Subject: Search in list of dictionaries
In-Reply-To: <499D9938.5010207@mrabarnett.plus.com>
References: <549d7a20902190917t10eed64dt71965ddc4bc7889f@mail.gmail.com>
	<499D9938.5010207@mrabarnett.plus.com>
Message-ID: <549d7a20902190953o46684ca0k76f974cec8bb77d9@mail.gmail.com>

Thanks! This example is quite simple and works exactly the way I wanted.

On Thu, Feb 19, 2009 at 11:39 PM, MRAB <google at mrabarnett.plus.com> wrote:

> Alex Gusarov wrote:
>
>> Hello everybody!
>>
>> I've a list of dictionaries with 'shorcut' and 'command' keys. When user
>> types a word program must search this list for a typed shortcut and then run
>> linked command. What I've wrote:
>>
>>        for cmd in self.commands:
>>            if cmd['shortcut'] == input:
>>                os.popen(cmd['command'])
>>                break
>>        else:
>>            os.popen(input)
>>
>> But it's a brute-force method and I think there is another way in
>> searching items through a list by dictionary key. Please give me advice how
>> can I implement fast search in list of dictionaries by some dictionary key.
>> In my mind language:
>>
>> list.get({'shortcut' == input})
>>
>>  If want to go from the shortcut to the command (cmd['shortcut'] ->
> cmd['command']) the quickest way is using a dict, where cmd['shortcut']
> is the key and cmd['command'] is the value:
>
>    self.command_dict = {}
>    for cmd in self.commands:
>        self.command_dict[cmd['shortcut']] = cmd['command']
>
> and then:
>
>    os.popen(self.command_dict[input])
>
> This will raise a KeyError if it's unknown. The equivalent of your code
> above is:
>
>    os.popen(self.command_dict.get(input, input))
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From sturlamolden at yahoo.no  Thu Feb 19 13:00:27 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Thu, 19 Feb 2009 10:00:27 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com> 
	<ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com>
Message-ID: <5dd3bccc-ebcd-4af0-bedd-2ca0a7b331fc@j8g2000yql.googlegroups.com>

On 19 Feb, 03:13, Carl Banks <pavlovevide... at gmail.com> wrote:

> The offset parameter of mmap itself would be useful to map small
> portions of gigabyte-sized files, and maybe numpy.memmap can take
> advantage of that if the user passes an offset parameter. ?

NumPy's memmap is just a wrapper for Python 2.5's mmap. The offset
parameter does not affect the amount that is actually memory mapped.

S.M.





From philip at semanchuk.com  Thu Feb 19 13:07:28 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 19 Feb 2009 13:07:28 -0500
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
Message-ID: <3378BF84-0A38-42E2-9541-01B959333288@semanchuk.com>


On Feb 19, 2009, at 12:30 PM, Helly John J. wrote:

> Hi Philip.
> I installed the 2.5.4 binary from the python.org site.  I did this  
> because NumPy and SciPy currently only work with 2.5 and the system  
> version was 2.4.

It looks like you're using the same Python at the command line as the  
Python to which you installed GDAL. There shouldn't be anything else  
you have to do once easy-install is complete.

As Miles pointed out, you should probably try this:
from osgeo import gdal

instead of this:
import gdal

Although I gather the latter should work based on the documentation  
here:
http://trac.osgeo.org/gdal/wiki/GdalOgrInPython#imports

I can't see what went wrong with your installation.

You can try an uninstall and reinstall. (`easy_install -m GDAL` might  
do the uninstall for you.) If you're feeling adventurous, you can try  
to unwind the installation by hand. Edit easy-install.pth and delete  
the line that refers to GDAL, and then blow away the GDAL directory in  
site-packages.

I see that you originally ran the easy_install from the directory '/ 
Library/Python/2.5/site-packages'. Don't do that. I don't have a  
logical reason for why, but Python given that the current directory is  
part of Python's import search path, you might be giving easy_install  
a different "environment" than your regular Python session. It's just  
a shot in the dark, but worth a try.

Sorry I couldn't be of more help.




> On Feb 17, 2009, at 12:30 PM, Philip Semanchuk wrote:
>
> On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:
>
>> Hi.
>>
>> I'm a newbie to python and am running:
>>
>> OS X 10.5.6
>> Python 2.5.4
>
> Hi John,
> Are you using the system Python or have you installed another version?
>
> Cheers
> Philip
>
>
>
>
>>
>>
>> and have run easy_install for gdal like this:
>>
>> /Library/Python/2.5/site-packages>sudo easy_install GDAL
>> Password:
>> Searching for GDAL
>> Best match: GDAL 1.6.0
>> Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
>> GDAL 1.6.0 is already the active version in easy-install.pth
>>
>> Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5- 
>> macosx-10.5-i386.egg
>> Processing dependencies for GDAL
>> Finished processing dependencies for GDAL
>>
>> However, when I run python and try to import gdal, this is what  
>> happens:
>>
>> Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
>> [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
>> Type "help", "copyright", "credits" or "license" for more  
>> information.
>> >>> import gdal
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> ImportError: No module named gdal
>> >>>
>>
>> Clearly, it's not being found but I don't understand how to debug  
>> this any further.  I have the *.egg in the site-packages directory  
>> but don't understand if there is something else I have to do to  
>> make it usable.  Any help would be much appreciated.
>> Cheers.
>> --------------
>> John Helly, University of California, San Diego
>> San Diego Supercomputer Center,  Mail Code 0527
>> Scripps Institution of Oceanography, Climate, Atmospheric Science,  
>> and Physical Oceanography, Mail Code 0224
>> 9500 Gilman Dr., La Jolla CA 92093
>> +01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7  
>> (iChat) / URL (http://www.sdsc.edu/~hellyj)
>>


From kyosohma at gmail.com  Thu Feb 19 13:17:23 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 10:17:23 -0800 (PST)
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
	<Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>
Message-ID: <d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>

On Feb 19, 11:29?am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> W. eWatson wrote:
> > Eric_Dex... at msn.com wrote:
> >> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
> >>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
> >>> version is the choice for me. The other choice has unicode. Do I care?
> >>> --
> >>> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> >>> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> >>> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> >>> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>
>
> >> There is a good chance you don't care... ?I think the other is for
> >> internationalization... ?best to look.. ?It would be easier to answer
> >> the question if you said what you are going to do with it, and who
> >> needed to use your software. ?It's even possible that you might want
> >> to try pygame depending on what you want to use it for and who the
> >> audience is (and how good thier computers are)
>
> >>http://pypi.python.org/simple/Dex%20Tracker/
> > Thanks. I think I'll take the chance. Somewhat simple programming.
> > Off I go to install it. It can always be un-installed.
>
> Well, that was an interesting experience. It appears to have recompiled a
> lot of stuff, and probably some libraries. IDLE is still with me as the way
> to open py files. Apparently, if I want to get around IDLE, I may have to
> install some other editor.
>
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>

The compiling you are referring to is just making the py files into
pyc files. This is normal and is a speed improvement. In fact, a lot
of the scripts you write will create a pyc file when first run.

In other words, wxPython does not affect your Python install in any
way other than making itself available as a 3rd party package (i.e.
adding itself to the path), just like any other good 3rd party
package. I'm not sure why you're even talking about IDLE...wxPython is
a GUI toolkit, not an IDE.

Mike


From pavlovevidence at gmail.com  Thu Feb 19 13:28:47 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 10:28:47 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<77c68ff8-d29d-4ada-9829-8f8f61c3ee4c@o36g2000yqh.googlegroups.com> 
	<ceb0a772-63c8-4f48-89cc-b60fa22ef7e7@j1g2000yqi.googlegroups.com> 
	<5dd3bccc-ebcd-4af0-bedd-2ca0a7b331fc@j8g2000yql.googlegroups.com>
Message-ID: <06e42c29-4d2d-4960-a448-6fbcda9607e4@v4g2000vbb.googlegroups.com>

On Feb 19, 10:00?am, sturlamolden <sturlamol... at yahoo.no> wrote:
> On 19 Feb, 03:13, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > The offset parameter of mmap itself would be useful to map small
> > portions of gigabyte-sized files, and maybe numpy.memmap can take
> > advantage of that if the user passes an offset parameter. ?
>
> NumPy's memmap is just a wrapper for Python 2.5's mmap. The offset
> parameter does not affect the amount that is actually memory mapped.

Yes, that's what I said, but in future numpy.mmap could be updated to
take advantage of mmap's new offset parameter.


Carl Banks


From steven.oldner at gmail.com  Thu Feb 19 13:32:00 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 10:32:00 -0800 (PST)
Subject: Newby Question for reading a file
Message-ID: <05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com>

Simple question but I haven't found an answer.  I program in ABAP, and
in ABAP you define the data structure of the file and move the file
line into the structure, and then do something to the fields.  That's
my mental reference.

How do I separate or address each field in the file line with PYTHON?
What's the correct way of thinking?

Thanks!


From gert.cuykens at gmail.com  Thu Feb 19 13:35:40 2009
From: gert.cuykens at gmail.com (gert)
Date: Thu, 19 Feb 2009 10:35:40 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com> 
	<mailman.234.1235039030.11746.python-list@python.org>
Message-ID: <bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>

Hope you do not mind ignoring part of answers, so I can figure out
more why things work the way they are.
This two examples work, what i do not understand is that in function
display i do not have to declare root, v or x ?

----------
example 1
----------
from tkinter import *
from _thread import start_new_thread
from time import sleep

x=0
def weegbrug():
    global x
    while True:
        x=x+1
        sleep(0.5)
start_new_thread(weegbrug,())

def display():
    v.set(x)
    root.after(500, lambda:display())

root = Tk()
v = StringVar()
txt = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
txt.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, lambda:display())
root.mainloop()


----------
example 2
----------
from tkinter import *
from threading import Thread
from time import sleep

class Weegbrug(Thread):
    def __init__(self):
        self.x=0
        Thread.__init__(self)
    def run(self):
        while True:
            self.x=self.x+1
            sleep(0.5)
w = Weegbrug()
w.start()

def display():
    v.set(w.x)
    root.after(500, lambda:display())

root = Tk()
v = StringVar()
txt = Label(root, textvariable=v, width=800, height=600, bg='yellow',
font=('Helvetica', 300))
txt.pack(expand=YES, fill=BOTH)
root.title('Weegbrug')
root.overrideredirect(1)
root.geometry('%dx%d+0+0' % (root.winfo_screenwidth(),
root.winfo_screenheight()))
root.after(500, lambda:display())
root.mainloop()


From lionel.keene at gmail.com  Thu Feb 19 13:36:49 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 10:36:49 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com>
Message-ID: <3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com>

On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > that memory is allocated at the slicing step in your example i.e. when
> > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > is constructed that memmaps the entire file. Some relatively small
> > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > No, what accounts for the memory efficienty is there is no bulk
> > > allocation at all. ?The ndarray you have points to the memory that's
> > > in the mmap. ?There is no copying data or separate array allocation.
>
> > Does this mean that everytime I iterate through an ndarray that is
> > sourced from a memmap, the data is read from the disc? The sliced
> > array is at no time wholly resident in memory? What are the
> > performance implications of this?
>
> Ok, sorry for the confusion. ?What I should have said is that there is
> no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> a chunk of RAM to reflect file contents, but the numpy arrays don't
> allocate any memory of their own: they use the same memory as was
> allocated by the mmap call.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

Thanks for the explanations Carl. I'm sorry, but it's me who's the
confused one here, not anyone else :-)

I hate to waste everyone's time again, but something is just not
"clicking" in that black-hole I call a brain. So..."numpy.memmap"
allocates a chunk off the heap to coincide with the file contents. If
I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
is allocated? That seems to contradict what is stated in the numpy
documentation:

"class numpy.memmap
Create a memory-map to an array stored in a file on disk.

Memory-mapped files are used for accessing small segments of large
files on disk, without reading the entire file into memory."

In my previous example that we were working with (100x100 data file),
you used an offset to memmap the "lower-half" of the array. Does this
mean that in the process of memmapping that lower half, RAM was set
aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
an entire file, there is no memory benefit in doing so.

At this point do you (or anyone else) recommend I just write a little
function for my class that takes the coords I intend to load and "roll
my own" function? Seems like the best way to keep memory to a minimum,
I'm just worried about performance. On the other hand, the most I'd be
loading would be around 1k x 1k worth of data.




From kyosohma at gmail.com  Thu Feb 19 13:40:36 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 10:40:36 -0800 (PST)
Subject: Newby Question for reading a file
References: 05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com
Message-ID: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>

On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
> Simple question but I haven't found an answer. ?I program in ABAP, and
> in ABAP you define the data structure of the file and move the file
> line into the structure, and then do something to the fields. ?That's
> my mental reference.
>
> How do I separate or address each field in the file line with PYTHON?
> What's the correct way of thinking?
>
> Thanks!

I don't really follow what you mean since I've never used ABAP, but
here's how I typically read a file in Python:

f = open("someFile.txt")
for line in f:
    # do something with the line
    print line
f.close()

Of course, you can read just portions of the file too, using something
like this:

f.read(64)

Which will read 64 bytes. For more info, check the following out:

http://www.diveintopython.org/file_handling/file_objects.html

 - Mike


From alan.isaac at gmail.com  Thu Feb 19 13:42:19 2009
From: alan.isaac at gmail.com (Alan G Isaac)
Date: Thu, 19 Feb 2009 18:42:19 GMT
Subject: block dynamic attribute creation
In-Reply-To: <499d1ca1$0$26184$426a74cc@news.free.fr>
References: <5didnW_7dfWlDQHUnZ2dnUVZ_q_inZ2d@rcn.net>
	<mailman.217.1234998934.11746.python-list@python.org>
	<hm4nl.271$tw4.14@nwrddc01.gnilink.net>
	<499d1ca1$0$26184$426a74cc@news.free.fr>
Message-ID: <fKhnl.355$tw4.335@nwrddc01.gnilink.net>

On 2/19/2009 3:47 AM Bruno Desthuilliers apparently wrote:
>       if not hasattr(self, attr) and getattr(self, '_attrlock', False):
>         raise AttributeError(yadda yadda)
>       # NB: assume newstyle class
>       super(YourClass, self).__setattr__(attr, val)


Thanks.
Alan
PS Thanks also to all who restrained
themselves from saying, "don't do this".
;-)


From harijay at gmail.com  Thu Feb 19 13:51:39 2009
From: harijay at gmail.com (harijay)
Date: Thu, 19 Feb 2009 10:51:39 -0800 (PST)
Subject: reading binary data from a 32 bit machine  on 64 bit machine
Message-ID: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>

Hi I am very confused with the use of the struct module to read binary
data from a file.
( I have only worked with ascii files so far)

I have a file spec for a Data-logger (http://www.dataq.com/support/
techinfo/ff.htm)

I am collecting some voltage , time traces on one channel and they are
written to the binary file on a 32 bit windows machine

The file spec says that the number of header bytes in the data file
header is stored as a 16 bit  eye "I" at bits 6-7

Now I want to get at that number. When I try format !h I get a
meaningful number
If f is my file handle opened with "rb" mode

>>> f.seek(5)
>>> (Integer,) = struct.unpack('!h',f.read(2))
>>> (Integer,)
(9348,)

I am assuming that means that there are 9348 header bytes . Can
someone look at the format spec and tell me if I am on the right
track.

Also if a binary guru can point me in the direction of a single line
format pythonic way to get at the header that will be great

Thanks a tonne
hari


From nad at acm.org  Thu Feb 19 13:51:46 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 10:51:46 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
Message-ID: <nad-D1A1B2.10514619022009@ger.gmane.org>

In article <F71B1E4C-87A5-41DD-AA9A-92687223F0DB at ucsd.edu>,
 "Helly John J." <hellyj at ucsd.edu> wrote:
> I installed the 2.5.4 binary from the python.org site.  I did this  
> because NumPy and SciPy currently only work with 2.5 and the system  
> version was 2.4.
>[...]
> On Feb 16, 2009, at 8:35 PM, Helly John J. wrote:
> > I'm a newbie to python and am running:
> > OS X 10.5.6
> > Python 2.5.4
>[...]
> > and have run easy_install for gdal like this:
> >
> > /Library/Python/2.5/site-packages>sudo easy_install GDAL
> > Password:
> > Searching for GDAL
> > Best match: GDAL 1.6.0
> > Processing GDAL-1.6.0-py2.5-macosx-10.5-i386.egg
> > GDAL 1.6.0 is already the active version in easy-install.pth
> >
> > Using /Library/Python/2.5/site-packages/GDAL-1.6.0-py2.5-macosx-10.5- 
> > i386.egg
> > Processing dependencies for GDAL
> > Finished processing dependencies for GDAL
> >
> > However, when I run python and try to import gdal, this is what  
> > happens:
> >
> > Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27)
> > [GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> import gdal
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > ImportError: No module named gdal
> > >>>

It looks like you have installed GDAL to the site-packages directory of 
the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).  
That site-packages directory is /Library/Python/2.5. The Apple-supplied 
python comes with a sym link from /usr/bin/python.  If you launch it, 
you'll probably find GDAL is there as expected.

If you do want to use the python.org python, which is somewhat newer, 
you need to install its own version of setuptools/easy_install and use 
it to install GDAL to the site-packages directory of that python which 
is located here:
/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-pack
ages.  The two python instances co-exist.  To install another 
easy_install, ensure the python.org python come first first on your 
PATH, then follow the instructions here:
   <http://pypi.python.org/pypi/setuptools>

-- 
 Ned Deily,
 nad at acm.org



From mkhitrov at gmail.com  Thu Feb 19 13:52:54 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 13:52:54 -0500
Subject: Strange array.array performance
Message-ID: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>

Hello all,

I'm currently writing a Python <-> MATLAB interface with ctypes and
array.array class, using which I'll need to push large amounts of data
to MATLAB. Everything is working well, but there was one strange
performance-related issue that I ran into and wanted to ask about.
Here's some example code to illustrate my point (this is developed on
Windows, hence the use of clock):

---
from array import array
from time import clock

input = array('B', range(256) * 10000)

# Case 1
start = clock()
data1 = array('B', input)
print format(clock() - start, '.10f')

# Case 2
start = clock()
data2 = array('B')
data2[:] = input
print format(clock() - start, '.10f')

# Case 3
start = clock()
data3 = array('B')
data3.extend(input)
print format(clock() - start, '.10f')

print input == data1 == data2 == data3
---

The output from this on my machine is as follows:

0.7080547730
0.0029827034
0.0028685943
True

That seems very wrong. In the end, all arrays have the same data, but
by specifying it in the constructor the creation process takes over
350x longer than the other two methods. Is this a bug, or is there
some valid reason for it?

In the latter case, it would be a good idea to mention this in the
documentation, since that can be a significant performance improvement
in some applications. Currently the documentation states "Otherwise,
the iterable initializer is passed to the extend() method," which
doesn't seem to be the case, based on the third example.

- Max


From rNOSPAMon at flownet.com  Thu Feb 19 13:55:01 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 10:55:01 -0800
Subject: Regular expression bug?
Message-ID: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>

I'm trying to split a CamelCase string into its constituent components.  
This kind of works:

>>> re.split('[a-z][A-Z]', 'fooBarBaz')
['fo', 'a', 'az']

but it consumes the boundary characters.  To fix this I tried using 
lookahead and lookbehind patterns instead, but it doesn't work:

>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
['fooBarBaz']

However, it does seem to work with findall:

>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
['', '']

So the regular expression seems to be doing the Right Thing.  Is this a 
bug in re.split, or am I missing something?

(BTW, I tried looking at the source code for the re module, but I could 
not find the relevant code.  re.split calls sre_compile.compile().split, 
but the string 'split' does not appear in sre_compile.py.  So where does 
this method come from?)

I'm using Python2.5.

Thanks,
rg


From albert at spenarnc.xs4all.nl  Thu Feb 19 13:56:42 2009
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 19 Feb 2009 18:56:42 GMT
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
Message-ID: <kfbtyi.45w@spenarnc.xs4all.nl>

In article <03db1c69-828a-4961-914d-62fe10ed88fb at w39g2000prb.googlegroups.com>,
Xah Lee  <xahlee at gmail.com> wrote:
<SNIP>
>
>Pascal Constanza wrote:
>> Yes. There are actually complete software development methodologies
>> built around these ideas. Google for "extreme programming" and "agile
>> software methodologies".
>
>Pascal Constanza is a Common Lisp fanatic. Note here, that eXtreme
>Programing is one of the snake oil, that ran like rampant wild fire in
>the industry around 2002, with many books published on it on the
>supposed motherfucking hip Software Engineering practices, but today
>you don't hear much of it. I haven't looked at =E2=80=9CAgile programing=E2=
>=80=9D
>agile my ass, but it is probably a waste of time.
>
>... what society overwhelmingly asks for is snake oil. Of course, the
>snake oil has the most impressive names =E2=80=94otherwise you would be
>selling nothing=E2=80=94 like =E2=80=9CStructured Analysis and Design=E2=80=
>=9D, =E2=80=9CSoftware
>Engineering=E2=80=9D, =E2=80=9CMaturity Models=E2=80=9D, =E2=80=9CManagemen=
>t Information Systems=E2=80=9D,
>=E2=80=9CIntegrated Project Support Environments=E2=80=9D =E2=80=9CObject O=
>rientation=E2=80=9D and
>=E2=80=9CBusiness Process Re-engineering=E2=80=9D (the latter three being k=
>nown as
>IPSE, OO and BPR, respectively).=E2=80=9D =E2=80=94 Edsger W Dijkstra (1930=
>-2002), in
>EWD 1175: The strengths of the academic enterprise.
>

A couple of weeks ago, a collegue of mine held a lecture about
a company where he is hired,
building paper-folding and envelope-handling machines.
(We are hired hands).
Real time, and real time simulators. Full regression tests
after each change. Agile scrum all the way down.

It looks impressive especially from where I stand. ( Formal procedures that
take 6 months, and bad fixes because approved changes were no
good after all.)

So not dead by a margin, and less snake oil than most methodologies
I know of.

>  Xah

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- like all pyramid schemes -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steven.oldner at gmail.com  Thu Feb 19 14:07:21 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 11:07:21 -0800 (PST)
Subject: Newby Question for reading a file
References: 05bacf78-1398-464a-8d0c-651157f7579c@w34g2000yqm.googlegroups.com 
	<6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
Message-ID: <3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>

On Feb 19, 12:40?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > Simple question but I haven't found an answer. ?I program in ABAP, and
> > in ABAP you define the data structure of the file and move the file
> > line into the structure, and then do something to the fields. ?That's
> > my mental reference.
>
> > How do I separate or address each field in the file line with PYTHON?
> > What's the correct way of thinking?
>
> > Thanks!
>
> I don't really follow what you mean since I've never used ABAP, but
> here's how I typically read a file in Python:
>
> f = open("someFile.txt")
> for line in f:
> ? ? # do something with the line
> ? ? print line
> f.close()
>
> Of course, you can read just portions of the file too, using something
> like this:
>
> f.read(64)
>
> Which will read 64 bytes. For more info, check the following out:
>
> http://www.diveintopython.org/file_handling/file_objects.html
>
> ?- Mike

Hi Mike,

ABAP is loosely based on COBOL.

Here is what I was trying to do, but ended up just coding in ABAP.

Read a 4 column text file of about 1,000 lines and compare the 2
middle field of each line.  If there is a difference, output the line.

The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
BEGDA(10) type c, and LGART(4) type c.
In ABAP the code is:
LOOP AT in_file.
  IF in_file-endda <> in_file-begda.
    WRITE:\ in_file. " that's same as python's print
  ENDIF.
ENDLOOP.

I can read the file, but didn't know how to look st the fields in the
line.  From what you wrote, I need to read each segment/field of the
line?

Thanks,

Steve


From nad at acm.org  Thu Feb 19 14:16:45 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 11:16:45 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
Message-ID: <nad-CE2288.11164519022009@ger.gmane.org>

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
 Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory of 
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).  
> That site-packages directory is /Library/Python/2.5. The Apple-supplied 
> python comes with a sym link from /usr/bin/python.  If you launch it, 
> you'll probably find GDAL is there as expected.
> 
> If you do want to use the python.org python, which is somewhat newer, 
> you need to install its own version of setuptools/easy_install and use 
> it to install GDAL to the site-packages directory of that python which 
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-pack
> ages.  The two python instances co-exist.  To install another 
  easy_install, ensure the python.org python comes first on your 
> PATH, then follow the instructions here:
>    <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory 
of the python.org python framework.  So to ensure you are using that 
easy_install and that python, make sure that bin directory is on your 
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin:$PATH"

-- 
 Ned Deily,
 nad at acm.org



From gagsl-py2 at yahoo.com.ar  Thu Feb 19 14:23:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 17:23:14 -0200
Subject: Strange array.array performance
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
Message-ID: <op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 16:52:54 -0200, Maxim Khitrov <mkhitrov at gmail.com>  
escribi?:

> input = array('B', range(256) * 10000)
>
> # Case 1
> start = clock()
> data1 = array('B', input)
> print format(clock() - start, '.10f')

> That seems very wrong. In the end, all arrays have the same data, but
> by specifying it in the constructor the creation process takes over
> 350x longer than the other two methods. Is this a bug, or is there
> some valid reason for it?

It's a known issue: http://bugs.python.org/issue5109

-- 
Gabriel Genellina



From andreas.schawo at googlemail.com  Thu Feb 19 14:23:52 2009
From: andreas.schawo at googlemail.com (Andy)
Date: Thu, 19 Feb 2009 11:23:52 -0800 (PST)
Subject: Regression test test_site failed on current trunk
Message-ID: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>

Hi,

I checked out the python trunk (curently 2.7a0), compiled it on my
linux machine and run the regression test suit. Below is the output of
the failed part:

test_site
[14871 refs]
test test_site failed -- Traceback (most recent call last):
  File "/mybook/storage/python_lnx/Lib/test/test_site.py", line 105,
in test_s_option
    self.assertEqual(rc, 1)
AssertionError: 0 != 1

Is this something serious.

I compiled python with:
./configure --prefix=/dev/null --with-pydebug
make -s

Further I've got problems with moving the cursor when I started python
(2.7a0). There are only esc sequences displayed. My Local installation
(2.5.2) works fine.


From marduk at letterboxes.org  Thu Feb 19 14:26:46 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 19 Feb 2009 14:26:46 -0500
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <1235071606.26110.18.camel@localhost.localdomain>

On Thu, 2009-02-19 at 10:55 -0800, Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.  
> This kind of works:
> 
> >>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using 
> lookahead and lookbehind patterns instead, but it doesn't work:

That's how re.split works, same as str.split...

> >>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
> >>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']


Wow!

To tell you the truth, I can't even read that... but one wonders why
don't you just do

def ccsplit(s):
    cclist = []
    current_word = ''
    for char in s:
        if char in string.uppercase:
            if current_word:
                cclist.append(current_word)
            current_word = char
        else:
            current_word += char
    if current_word:
        ccl.append(current_word)
    return cclist

>>> ccsplit('fooBarBaz')
--> ['foo', 'Bar', 'Baz']

This is arguably *much* more easy to read than the re example doesn't
require one to look ahead in the string.

-a




From robert.kern at gmail.com  Thu Feb 19 14:35:45 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 19 Feb 2009 13:35:45 -0600
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
Message-ID: <gnkcah$rqa$1@ger.gmane.org>

On 2009-02-19 12:52, Maxim Khitrov wrote:
> Hello all,
>
> I'm currently writing a Python<->  MATLAB interface with ctypes and
> array.array class, using which I'll need to push large amounts of data
> to MATLAB.

Have you taken a look at mlabwrap?

   http://mlabwrap.sourceforge.net/

At the very least, you will probably want to use numpy arrays instead of 
array.array.

   http://numpy.scipy.org/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From __peter__ at web.de  Thu Feb 19 14:38:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 20:38:11 +0100
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
Message-ID: <gnkceu$5i9$02$1@news.t-online.com>

steven.oldner wrote:

> On Feb 19, 12:40?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 19, 12:32?pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>>
>> > Simple question but I haven't found an answer. ?I program in ABAP, and
>> > in ABAP you define the data structure of the file and move the file
>> > line into the structure, and then do something to the fields. ?That's
>> > my mental reference.
>>
>> > How do I separate or address each field in the file line with PYTHON?
>> > What's the correct way of thinking?
>>
>> > Thanks!
>>
>> I don't really follow what you mean since I've never used ABAP, but
>> here's how I typically read a file in Python:
>>
>> f = open("someFile.txt")
>> for line in f:
>> # do something with the line
>> print line
>> f.close()
>>
>> Of course, you can read just portions of the file too, using something
>> like this:
>>
>> f.read(64)
>>
>> Which will read 64 bytes. For more info, check the following out:
>>
>> http://www.diveintopython.org/file_handling/file_objects.html
>>
>> - Mike
> 
> Hi Mike,
> 
> ABAP is loosely based on COBOL.
> 
> Here is what I was trying to do, but ended up just coding in ABAP.
> 
> Read a 4 column text file of about 1,000 lines and compare the 2
> middle field of each line.  If there is a difference, output the line.
> 
> The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> BEGDA(10) type c, and LGART(4) type c.
> In ABAP the code is:
> LOOP AT in_file.
>   IF in_file-endda <> in_file-begda.
>     WRITE:\ in_file. " that's same as python's print
>   ENDIF.
> ENDLOOP.
> 
> I can read the file, but didn't know how to look st the fields in the
> line.  From what you wrote, I need to read each segment/field of the
> line?

Yes you can get portions of the line by slicing:

for line in open("infile"):
    if line[8:18] != line[18:28]:
            print line,

Or you can use the struct module:

import struct
for line in open("infile"):
    pernr, endda, begda, lgart, dummy = struct.unpack("8s10s10s4s1s", line)
    if endda != begda:
        print line,

I'm assuming that a row in your input file is just the fields glued together
followed by a newline.

Peter



From kwmsmith at gmail.com  Thu Feb 19 14:41:17 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Thu, 19 Feb 2009 13:41:17 -0600
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <c266a7930902191141l3da1cd26h2e7e9781543fb01c@mail.gmail.com>

On Thu, Feb 19, 2009 at 12:55 PM, Ron Garret <rNOSPAMon at flownet.com> wrote:
> I'm trying to split a CamelCase string into its constituent components.
> This kind of works:
>
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
>
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
>
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
>
> However, it does seem to work with findall:
>
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
>
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?

>From what I can tell, re.split can't split on zero-length boundaries.
It needs something to split on, like str.split.  Is this a bug?
Possibly.  The docs for re.split say:

Split the source string by the occurrences of the pattern,
    returning a list containing the resulting substrings.

Note that it does not say that zero-length matches won't work.

I can work around the problem thusly:

re.sub(r'(?<=[a-z])(?=[A-Z])', '_', 'fooBarBaz').split('_')

Which is ugly.  I reckon you can use re.findall with a pattern that
matches the components and not the boundaries, but you have to take
care of the beginning and end as special cases.

Kurt


From curt.hash at gmail.com  Thu Feb 19 14:44:12 2009
From: curt.hash at gmail.com (Curt Hash)
Date: Thu, 19 Feb 2009 12:44:12 -0700
Subject: Newby Question for reading a file
In-Reply-To: <3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
Message-ID: <736698790902191144p4f5a250dud6c2fa83787942ae@mail.gmail.com>

On Thu, Feb 19, 2009 at 12:07 PM, steven.oldner <steven.oldner at gmail.com> wrote:
>
> On Feb 19, 12:40 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > On Feb 19, 12:32 pm, "steven.oldner" <steven.old... at gmail.com> wrote:
> >
> > > Simple question but I haven't found an answer.  I program in ABAP, and
> > > in ABAP you define the data structure of the file and move the file
> > > line into the structure, and then do something to the fields.  That's
> > > my mental reference.
> >
> > > How do I separate or address each field in the file line with PYTHON?
> > > What's the correct way of thinking?
> >
> > > Thanks!
> >
> > I don't really follow what you mean since I've never used ABAP, but
> > here's how I typically read a file in Python:
> >
> > f = open("someFile.txt")
> > for line in f:
> >     # do something with the line
> >     print line
> > f.close()
> >
> > Of course, you can read just portions of the file too, using something
> > like this:
> >
> > f.read(64)
> >
> > Which will read 64 bytes. For more info, check the following out:
> >
> > http://www.diveintopython.org/file_handling/file_objects.html
> >
> >  - Mike
>
> Hi Mike,
>
> ABAP is loosely based on COBOL.
>
> Here is what I was trying to do, but ended up just coding in ABAP.
>
> Read a 4 column text file of about 1,000 lines and compare the 2
> middle field of each line.  If there is a difference, output the line.
>
> The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> BEGDA(10) type c, and LGART(4) type c.
> In ABAP the code is:
> LOOP AT in_file.
>  IF in_file-endda <> in_file-begda.
>    WRITE:\ in_file. " that's same as python's print
>  ENDIF.
> ENDLOOP.
>
> I can read the file, but didn't know how to look st the fields in the
> line.  From what you wrote, I need to read each segment/field of the
> line?
>
> Thanks,
>
> Steve
> --
> http://mail.python.org/mailman/listinfo/python-list

You could do something like this:

f = open('file.txt', 'r')
for line in f:
    a,b = line.split()[1:-1]   # tokenize the string into sequence of
length 4 and store two middle values in a and b
    if a != b:
        print line
f.close()


From schumann at fnal.gov  Thu Feb 19 14:47:09 2009
From: schumann at fnal.gov (Carl Schumann)
Date: Thu, 19 Feb 2009 13:47:09 -0600
Subject: Explanation for trailing comma in example from Learning Python?
Message-ID: <499DB73D.1010208@fnal.gov>

Hi,

I am surprised at the trailing comma in the following example from 
"Learning Python":
> Python 2.3.4 (#1, Dec 10 2007, 15:05:56)
> [GCC 3.4.5 20051201 (Red Hat 3.4.5-2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> def f(*args): print args
> ...
> >>> f()
> ()
> >>> f(1)
> (1,)
> >>> f(1,2)
> (1, 2)
> >>> f(1,2,3)
> (1, 2, 3)
> >>> f(1,2,3,4)
> (1, 2, 3, 4)
> >>>
I could see the logic in always or never having a trailing comma.   What 
I don't understand here is why only the single element case has a 
trailing comma.   Any explanations please?

Thanks,
Carl Schumann




From andrew at acooke.org  Thu Feb 19 14:51:06 2009
From: andrew at acooke.org (andrew cooke)
Date: Thu, 19 Feb 2009 16:51:06 -0300 (CLST)
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <34b34b7c7b3c5d5230212d26837fc039.squirrel@localhost>


i wonder what fraction of people posting with "bug?" in their titles here
actually find bugs?

anyway, how about:

re.findall('[A-Z]?[a-z]*', 'fooBarBaz')

or

re.findall('([A-Z][a-z]*|[a-z]+)', 'fooBarBaz')

(you have to specify what you're matching and lookahead/back doesn't do
that).

andrew


Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.
> This kind of works:
>
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
>
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
>
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
>
> However, it does seem to work with findall:
>
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
>
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?
>
> (BTW, I tried looking at the source code for the re module, but I could
> not find the relevant code.  re.split calls sre_compile.compile().split,
> but the string 'split' does not appear in sre_compile.py.  So where does
> this method come from?)
>
> I'm using Python2.5.
>
> Thanks,
> rg
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From __peter__ at web.de  Thu Feb 19 14:52:58 2009
From: __peter__ at web.de (Peter Otten)
Date: Thu, 19 Feb 2009 20:52:58 +0100
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <gnkdal$bcq$01$1@news.t-online.com>

Ron Garret wrote:

> I'm trying to split a CamelCase string into its constituent components.

How about

>>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
['foo', 'Bar', 'Baz']

> This kind of works:
> 
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
> 
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
> 
> So the regular expression seems to be doing the Right Thing.  Is this a
> bug in re.split, or am I missing something?

IRC the split pattern must consume at least one character, but I can't find
the reference.
 
> (BTW, I tried looking at the source code for the re module, but I could
> not find the relevant code.  re.split calls sre_compile.compile().split,
> but the string 'split' does not appear in sre_compile.py.  So where does
> this method come from?)

It's coded in C. The source is Modules/sremodule.c.

Peter


From mkhitrov at gmail.com  Thu Feb 19 14:53:21 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 14:53:21 -0500
Subject: Strange array.array performance
In-Reply-To: <gnkcah$rqa$1@ger.gmane.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
Message-ID: <26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>
>> Hello all,
>>
>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>> array.array class, using which I'll need to push large amounts of data
>> to MATLAB.
>
> Have you taken a look at mlabwrap?
>
>  http://mlabwrap.sourceforge.net/
>
> At the very least, you will probably want to use numpy arrays instead of
> array.array.
>
>  http://numpy.scipy.org/

I have, but numpy is not currently available for python 2.6, which is
what I need for some other features, and I'm trying to keep the
dependencies down in any case. Mlabwrap description doesn't mention if
it is thread-safe, and that's another one of my requirements.

The only feature that I'm missing with array.array is the ability to
quickly pre-allocate large chunks of memory. To do that right now I'm
using array('d', (0,) * size). It would be nice if array accepted an
int as the second argument indicating how much memory to allocate and
initialize to 0.

- Max


From mkhitrov at gmail.com  Thu Feb 19 14:53:59 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 14:53:59 -0500
Subject: Strange array.array performance
In-Reply-To: <op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<op.upl5g0s3x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <26ddd1750902191153q621d94f5xcf32ecf8e4513503@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:23 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Thu, 19 Feb 2009 16:52:54 -0200, Maxim Khitrov <mkhitrov at gmail.com>
> escribi?:
>
>> input = array('B', range(256) * 10000)
>>
>> # Case 1
>> start = clock()
>> data1 = array('B', input)
>> print format(clock() - start, '.10f')
>
>> That seems very wrong. In the end, all arrays have the same data, but
>> by specifying it in the constructor the creation process takes over
>> 350x longer than the other two methods. Is this a bug, or is there
>> some valid reason for it?
>
> It's a known issue: http://bugs.python.org/issue5109

I see, thanks.


From google at mrabarnett.plus.com  Thu Feb 19 14:56:53 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 19:56:53 +0000
Subject: reading binary data from a 32 bit machine  on 64 bit machine
In-Reply-To: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
References: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
Message-ID: <499DB985.2040107@mrabarnett.plus.com>

harijay wrote:
> Hi I am very confused with the use of the struct module to read binary
> data from a file.
> ( I have only worked with ascii files so far)
> 
> I have a file spec for a Data-logger (http://www.dataq.com/support/
> techinfo/ff.htm)
> 
> I am collecting some voltage , time traces on one channel and they are
> written to the binary file on a 32 bit windows machine
> 
> The file spec says that the number of header bytes in the data file
> header is stored as a 16 bit  eye "I" at bits 6-7
> 
> Now I want to get at that number. When I try format !h I get a
> meaningful number
> If f is my file handle opened with "rb" mode
> 
>>>> f.seek(5)
>>>> (Integer,) = struct.unpack('!h',f.read(2))
>>>> (Integer,)
> (9348,)
> 
> I am assuming that means that there are 9348 header bytes . Can
> someone look at the format spec and tell me if I am on the right
> track.
> 
> Also if a binary guru can point me in the direction of a single line
> format pythonic way to get at the header that will be great
> 
The number of header bytes is stored in bytes 6-7, so you need seek(6),
and the 16-bit value is little-endian as far as I can tell:

     f.seek(6)
     header_bytes, = struct.unpack('<h', f.read(2))


From thomasmallen at gmail.com  Thu Feb 19 14:58:11 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Thu, 19 Feb 2009 11:58:11 -0800 (PST)
Subject: "Maximum recursion depth exceeded"...why?
References: <847153c1-579e-4e4f-a21d-dcf106f15636@r41g2000yqm.googlegroups.com>
	<e8727ace-b202-4c69-8b4c-cfcf772291de@f20g2000yqg.googlegroups.com> 
	<7xr61w8r20.fsf@ruckus.brouhaha.com>
	<cca9cdc3-7fbc-4309-9834-6d731a37fafd@u18g2000pro.googlegroups.com>
	<mailman.184.1234949665.11746.python-list@python.org>
	<c9ecdd8b-ec8a-4461-b7e3-59cb10e37177@q40g2000prh.googlegroups.com>
	<788cab73-b999-48e4-beb3-b9dd38c501de@j8g2000yql.googlegroups.com> 
	<mailman.223.1235013371.11746.python-list@python.org>
Message-ID: <d3a5affc-c48d-405e-8f61-fa66d63f1875@13g2000yql.googlegroups.com>

On Feb 18, 10:15?pm, rdmur... at bitdance.com wrote:
> Thomas Allen <thomasmal... at gmail.com> wrote:
> > On Feb 18, 4:51 am, alex23 <wuwe... at gmail.com> wrote:
> > > On Feb 18, 7:34 pm, rdmur... at bitdance.com wrote:
>
> > > > Yeah, but wget -r -k will do that bit of it, too.
>
> > > Wow, nice, I don't know why I never noticed that. Cheers!
>
> > Hm...doesn't do that over here. I thought it may have been because of
> > absolute links (not to site root), but it even leaves things like <a
> > href="/">. Does it work for you guys?
>
> It works for me. ?The sample pages I just tested on it don't use
> any href="/" links, but my 'href="/about.html"' got properly
> converted to 'href="../about.html"'. ?(On the other hand my '/contact.html'
> got converted to a full external URL...but that's apparently because the
> contact.html file doesn't actually exist :)
>
> --RDM

Thanks for the help everyone. The idea of counting the slashes was the
linchpin of this little script, and with a little trial and error, I
successfully generated a local copy of the site. I don't think my
colleague knows what went into this, but he seemed appreciative :^)

Thomas


From google at mrabarnett.plus.com  Thu Feb 19 15:03:45 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 20:03:45 +0000
Subject: Regular expression bug?
In-Reply-To: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
Message-ID: <499DBB21.9080600@mrabarnett.plus.com>

Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.  
> This kind of works:
> 
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> 
> but it consumes the boundary characters.  To fix this I tried using 
> lookahead and lookbehind patterns instead, but it doesn't work:
> 
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> ['fooBarBaz']
> 
> However, it does seem to work with findall:
> 
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
> 
> So the regular expression seems to be doing the Right Thing.  Is this a 
> bug in re.split, or am I missing something?
> 
> (BTW, I tried looking at the source code for the re module, but I could 
> not find the relevant code.  re.split calls sre_compile.compile().split, 
> but the string 'split' does not appear in sre_compile.py.  So where does 
> this method come from?)
> 
> I'm using Python2.5.
> 
I, amongst others, think it's a bug (or 'misfeature'); Guido thinks it
might be intentional, but changing it could break some existing code.
You could do this instead:

 >>> re.sub('(?<=[a-z])(?=[A-Z])', '@', 'fooBarBaz').split('@')
['foo', 'Bar', 'Baz']


From steven.oldner at gmail.com  Thu Feb 19 15:10:22 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Thu, 19 Feb 2009 12:10:22 -0800 (PST)
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com> 
	<mailman.276.1235072657.11746.python-list@python.org>
Message-ID: <95d6b271-88a4-4c04-b582-d7ed665b44d4@f3g2000yqf.googlegroups.com>

On Feb 19, 1:44?pm, Curt Hash <curt.h... at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 12:07 PM, steven.oldner <steven.old... at gmail.com> wrote:
>
> > On Feb 19, 12:40 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> > > On Feb 19, 12:32 pm, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > > > Simple question but I haven't found an answer. ?I program in ABAP, and
> > > > in ABAP you define the data structure of the file and move the file
> > > > line into the structure, and then do something to the fields. ?That's
> > > > my mental reference.
>
> > > > How do I separate or address each field in the file line with PYTHON?
> > > > What's the correct way of thinking?
>
> > > > Thanks!
>
> > > I don't really follow what you mean since I've never used ABAP, but
> > > here's how I typically read a file in Python:
>
> > > f = open("someFile.txt")
> > > for line in f:
> > > ? ? # do something with the line
> > > ? ? print line
> > > f.close()
>
> > > Of course, you can read just portions of the file too, using something
> > > like this:
>
> > > f.read(64)
>
> > > Which will read 64 bytes. For more info, check the following out:
>
> > >http://www.diveintopython.org/file_handling/file_objects.html
>
> > > ?- Mike
>
> > Hi Mike,
>
> > ABAP is loosely based on COBOL.
>
> > Here is what I was trying to do, but ended up just coding in ABAP.
>
> > Read a 4 column text file of about 1,000 lines and compare the 2
> > middle field of each line. ?If there is a difference, output the line.
>
> > The line's definition in ABAP is PERNR(8) type c, ENDDA(10) type c,
> > BEGDA(10) type c, and LGART(4) type c.
> > In ABAP the code is:
> > LOOP AT in_file.
> > ?IF in_file-endda <> in_file-begda.
> > ? ?WRITE:\ in_file. " that's same as python's print
> > ?ENDIF.
> > ENDLOOP.
>
> > I can read the file, but didn't know how to look st the fields in the
> > line. ?From what you wrote, I need to read each segment/field of the
> > line?
>
> > Thanks,
>
> > Steve
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> You could do something like this:
>
> f = open('file.txt', 'r')
> for line in f:
> ? ? a,b = line.split()[1:-1] ? # tokenize the string into sequence of
> length 4 and store two middle values in a and b
> ? ? if a != b:
> ? ? ? ? print line
> f.close()- Hide quoted text -
>
> - Show quoted text -

Peter, you are correct, just fields glued together.  I did not know
there was a struc module and that code looks real good.  This is
something I will use in the future. Thanks!

Curt, that looks good also.  I just need to test the 2 middle values.
I didn't know how to store line.split values into variables and this
is simple. Thanks!

Again, thanks Mike, Peter and Curt.  Now if you ever need to know
ABAP... ;)






From http  Thu Feb 19 15:18:04 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 12:18:04 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
Message-ID: <7x8wo2kwoz.fsf@ruckus.brouhaha.com>

sturlamolden <sturlamolden at yahoo.no> writes:
> Yes, the GIL prevents Python threads from being used in a certain way.
> But do you really need to use threads like that? Or do you just think
> you do?

How old is your computer, why did you buy it, and is it the first one
you ever owned?

For most of us, I suspect, it is not our first one, and we bought it
to get a processing speedup relative to the previous one.  If such
speedups were useless or unimportant, we would not have blown our hard
earned cash replacing perfectly good older hardware, so we have to
accept the concept that speed matters and ignore those platitudes that
say otherwise.

It used to be that new computers were faster than the old ones because
they ran at higher clock rates.  That was great, no software changes
at all were required to benefit from the higher speed.  Now, they get
the additional speed by having more cores.  That's better than nothing
but making use of it requires fixing the GIL.


From pavlovevidence at gmail.com  Thu Feb 19 15:26:33 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Thu, 19 Feb 2009 12:26:33 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com> 
	<3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com>
Message-ID: <d5ca741f-66e8-4a38-ba1f-61bce976f751@b16g2000yqb.googlegroups.com>

On Feb 19, 10:36?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > > that memory is allocated at the slicing step in your example i.e. when
> > > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > > is constructed that memmaps the entire file. Some relatively small
> > > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > > No, what accounts for the memory efficienty is there is no bulk
> > > > allocation at all. ?The ndarray you have points to the memory that's
> > > > in the mmap. ?There is no copying data or separate array allocation.
>
> > > Does this mean that everytime I iterate through an ndarray that is
> > > sourced from a memmap, the data is read from the disc? The sliced
> > > array is at no time wholly resident in memory? What are the
> > > performance implications of this?
>
> > Ok, sorry for the confusion. ?What I should have said is that there is
> > no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> > a chunk of RAM to reflect file contents, but the numpy arrays don't
> > allocate any memory of their own: they use the same memory as was
> > allocated by the mmap call.
>
> > Carl Banks- Hide quoted text -
>
> > - Show quoted text -
>
> Thanks for the explanations Carl. I'm sorry, but it's me who's the
> confused one here, not anyone else :-)
>
> I hate to waste everyone's time again, but something is just not
> "clicking" in that black-hole I call a brain. So..."numpy.memmap"
> allocates a chunk off the heap to coincide with the file contents. If
> I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
> is allocated? That seems to contradict what is stated in the numpy
> documentation:
>
> "class numpy.memmap
> Create a memory-map to an array stored in a file on disk.
>
> Memory-mapped files are used for accessing small segments of large
> files on disk, without reading the entire file into memory."

Yes, it allocates room for the whole file in your process's LOGICAL
address space.  However, it doesn't actually reserve any PHYSICAL
memory, or read in any data from the disk, until you've actually
access the data.  And then it only reads small chunks in, not the
whole file.

So when you mmap your 1GB file, the OS sets aside a 1 GB chunk of
address to use for your memory map.  That's all it does: it doesn't
read anything from disk, it doesn't reserve any physical RAM.  Later,
when you access a byte in the mmap via a pointer, the OS notes that it
hasn't yet loaded the data at that address, so it grabs a small chunk
of physical ram and reads in the a small amount of data from the disk
containing the byte you are accessing.  This all happens automatically
and transparently to you.


> In my previous example that we were working with (100x100 data file),
> you used an offset to memmap the "lower-half" of the array. Does this
> mean that in the process of memmapping that lower half, RAM was set
> aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
> an entire file, there is no memory benefit in doing so.

The mmap call sets aside room for all 100x100 32-bit complex numbers
in logical address space, regardless of whether you use the offset
parameter or not.  However, it might only read in part of the file in
from disk, and will only reserve physical RAM for the parts it reads
in.


> At this point do you (or anyone else) recommend I just write a little
> function for my class that takes the coords I intend to load and "roll
> my own" function? Seems like the best way to keep memory to a minimum,
> I'm just worried about performance. On the other hand, the most I'd be
> loading would be around 1k x 1k worth of data.-

No, if your file is not too large to mmap, just do it the way you've
been doing it.  The documentation you've been reading is pretty much
correct, even if you approach it naively.  It is both memory and I/O
efficient.  You're overthinking things here; don't try to outsmart the
operating system.  It'll take care of the performance issues
satisfactorily.

The only thing you have to worry about is if the file is too large to
fit into your process's logical address space, which on a typical 32-
bit system is 2-3 GB (depending on configuration) minus the space
occupied by Python and other heap objects, which is probably only a
few MB.



Carl Banks


From gagsl-py2 at yahoo.com.ar  Thu Feb 19 15:31:25 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 19 Feb 2009 18:31:25 -0200
Subject: reading binary data from a 32 bit machine  on 64 bit machine
References: <5698de3a-1796-4e40-8bdb-2a35dae7895f@j8g2000yql.googlegroups.com>
Message-ID: <op.upl8mnr2x6zn5v@gabriel.sleipnir-bsas>

En Thu, 19 Feb 2009 16:51:39 -0200, harijay <harijay at gmail.com> escribi?:

> Hi I am very confused with the use of the struct module to read binary
> data from a file.
> ( I have only worked with ascii files so far)
>
> I have a file spec for a Data-logger (http://www.dataq.com/support/
> techinfo/ff.htm)

That format is rather convoluted -- due to historical reasons, I imagine...

> I am collecting some voltage , time traces on one channel and they are
> written to the binary file on a 32 bit windows machine
>
> The file spec says that the number of header bytes in the data file
> header is stored as a 16 bit  eye "I" at bits 6-7

If it says "at *byte* positions 6-7" you need a seek(6) to start reading  
 from there, not seek(5).

> Now I want to get at that number. When I try format !h I get a
> meaningful number
> If f is my file handle opened with "rb" mode
>
>>>> f.seek(5)
>>>> (Integer,) = struct.unpack('!h',f.read(2))
>>>> (Integer,)
> (9348,)
>
> I am assuming that means that there are 9348 header bytes . Can
> someone look at the format spec and tell me if I am on the right
> track.

Not exactly. Why '!' (network byte order)? The spec doesn't say about byte  
order, but since it's a Windows program we can assume little endian, '<'  
or just '=' (native).
But instead of multiple seeks + micro-reads I'd read the whole header and  
decode it at once (the fixed part is only 110 bytes long):

fixed_header_fmt = struct.Struct("<HHBBhLL...")
f = open(..., 'rb')
fixed_header = f.read(110)
elements = [None]
elements[1:] = fixed_header_fmt.unpack(fixed_header)
# just to keep the 1-based element numbering

Now, elements[4] is the fourth row in the table, "Number of bytes in each  
channel info entry"

The format is built from the Type column: UI -> H, I -> h, B -> B, UL ->  
L, L -> l, D -> d, F -> f.

-- 
Gabriel Genellina



From steve at holdenweb.com  Thu Feb 19 15:33:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:33:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <499DC237.9010301@holdenweb.com>

rushenaly at gmail.com wrote:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)
> 
> Thank you so much great community...
> Rushen

By the way, since you have chosen Java you might be interested to know
that the JPython implementation (also open source) generates JVM
bytecode, and allows you to freely mix Java and Python classes.

There is no Global Interpreter Lock in JPython ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 15:33:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:33:59 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
Message-ID: <499DC237.9010301@holdenweb.com>

rushenaly at gmail.com wrote:
> Thank you Steve,
> 
> I really wanted to learn python, but as i said i don't want to make a
> dead investment. I hope someone can fix these design errors and maybe
> can write an interpreter in python :)
> 
> Thank you so much great community...
> Rushen

By the way, since you have chosen Java you might be interested to know
that the JPython implementation (also open source) generates JVM
bytecode, and allows you to freely mix Java and Python classes.

There is no Global Interpreter Lock in JPython ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From invalid at invalid  Thu Feb 19 15:44:00 2009
From: invalid at invalid (Grant Edwards)
Date: Thu, 19 Feb 2009 14:44:00 -0600
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<mailman.284.1235075660.11746.python-list@python.org>
Message-ID: <19idnYERhNYNWQDUnZ2dnUVZ_vqdnZ2d@posted.visi>

On 2009-02-19, Steve Holden <steve at holdenweb.com> wrote:

> By the way, since you have chosen Java you might be interested
> to know that the JPython implementation (also open source)
> generates JVM bytecode, and allows you to freely mix Java and
> Python classes.
>
> There is no Global Interpreter Lock in JPython ...

I think somebody should propose adding one.

It would be a nice change of pace from the standard
never-ending thread(s) on the GIL.

-- 
Grant Edwards                   grante             Yow! I'm into SOFTWARE!
                                  at               
                               visi.com            


From steve at holdenweb.com  Thu Feb 19 15:47:48 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 15:47:48 -0500
Subject: Regression test test_site failed on current trunk
In-Reply-To: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
References: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
Message-ID: <gnkghj$d56$1@ger.gmane.org>

Andy wrote:
> Hi,
> 
> I checked out the python trunk (curently 2.7a0), compiled it on my
> linux machine and run the regression test suit. Below is the output of
> the failed part:
> 
> test_site
> [14871 refs]
> test test_site failed -- Traceback (most recent call last):
>   File "/mybook/storage/python_lnx/Lib/test/test_site.py", line 105,
> in test_s_option
>     self.assertEqual(rc, 1)
> AssertionError: 0 != 1
> 
> Is this something serious.
> 
I'd say any test failure without an obvious explanation is serious
enough to report as a bug. See http://bugs.python.org/

> I compiled python with:
> ./configure --prefix=/dev/null --with-pydebug
> make -s
> 
> Further I've got problems with moving the cursor when I started python
> (2.7a0). There are only esc sequences displayed. My Local installation
> (2.5.2) works fine.

Do you mean you can't get previous lines in your Python command history
to show up? This sounds as though you may not have built the readline
support in to your experimental build. I can't remember exactly what the
deal is, but I know that readline is GPL licensed, so it may not come as
part of the standard distribution.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From garrickp at gmail.com  Thu Feb 19 15:48:37 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 12:48:37 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>

On Feb 19, 1:18?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> ... ?If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

That's fair, but by using a high level language in the first place,
you've already made the conscious decision to sacrifice speed for ease
of programming. Otherwise, you would probably be programming in C.

The question really is "Is it fast enough", and the answer usually is
"Yes". And when the answer is "No", there are many things which can be
done before the need to multi-thread the whole script comes about.

It's a proposition that used to bother me, until I did some actual
programming of real world problems in Python. I've yet to really find
a case where the application was slow enough to justify the cost of
using multiple Python processes.

~G


From frankrentef at yahoo.com  Thu Feb 19 15:50:27 2009
From: frankrentef at yahoo.com (frankrentef)
Date: Thu, 19 Feb 2009 12:50:27 -0800 (PST)
Subject: Newbie request assistance....Python - PAMIE - Java
Message-ID: <c8e0768f-0407-4c9f-a9db-d4a89089511a@v19g2000yqn.googlegroups.com>

Greetings all...

Newbie here to the Python world.  I've written some basic script with
the purpose of automating testing of an application via Python /
Pamie.  I've had pretty good success until a spot I'm testing displays
a Java pop up.  I need to have Pamie access the fields in the window
(i.e. add a value and activate the "enter" button.)  Can someone
assist.

Some of the code I have currently is as follows...when the script I've
written gets to the end the java window pops up automatically....I
don't understand how to interface with it.

THNX

ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMAX', '5000.00')
time.sleep(2)
ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMIN', '0')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
ie.timesleep(2)
ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMaxMicrRejects',
'1')
time.sleep(2)
ie.buttonClick('_ctl0_ContentPlaceHolder1_arc1_btnUpdate')
time.sleep2


From lists at cheimes.de  Thu Feb 19 15:54:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 19 Feb 2009 21:54:34 +0100
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <499DB73D.1010208@fnal.gov>
References: <499DB73D.1010208@fnal.gov>
Message-ID: <gnkgua$cr1$1@ger.gmane.org>

Carl Schumann wrote:
> I could see the logic in always or never having a trailing comma.   What
> I don't understand here is why only the single element case has a
> trailing comma.   Any explanations please?

Does this code shad some light on the trailing comma? :)

>>> (1) == 1
True
>>> (1,) == 1
False
>>> type((1))
<type 'int'>
>>> type((1,))
<type 'tuple'>

>>> a = 1
>>> a
1
>>> a = (1)
>>> a
1
>>> a = (1,)
>>> a
(1,)
>>> a = 1,
>>> a
(1,)



From rt8396 at gmail.com  Thu Feb 19 15:54:34 2009
From: rt8396 at gmail.com (r)
Date: Thu, 19 Feb 2009 12:54:34 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com> 
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
Message-ID: <5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>

On Feb 19, 2:29?am, Lie <Lie.1... at gmail.com> wrote:
> On Feb 18, 8:02?pm, r <rt8... at gmail.com> wrote:
> Blender's UI is designed for effective and efficient 3D workflow, not
> for low learning curve.

And that will be it's downfall!

I know what what Blenders UI is designed for. However not too many
people get religious about learning a UI, which is the only way you
will ever learn Blenders UI. This is why although Blender has a cult
following, it will never grow into a tool that the mainstream world
knows about, or for that matter cares about.

I have been using Blender on and off for almost a year and i still
cannot get comfortable with the UI. For instance adding a material to
a object involves multiple steps between multiple windows (WHAT!). Go
take a look at SketchUp's UI and you will see how the future will
look. Even 3DS or Maya is easier to learn that Blender.






From aleksandr.goretoy at gmail.com  Thu Feb 19 15:57:54 2009
From: aleksandr.goretoy at gmail.com (alex goretoy)
Date: Thu, 19 Feb 2009 14:57:54 -0600
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <gnkgua$cr1$1@ger.gmane.org>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
Message-ID: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>

Thank you for clerification Christian,
when using trailing comma with print statement/function, does it not mean to
output newline after printed data?

-Alex Goretoy
http://www.goretoy.com



On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de> wrote:

> Carl Schumann wrote:
> > I could see the logic in always or never having a trailing comma.   What
> > I don't understand here is why only the single element case has a
> > trailing comma.   Any explanations please?
>
> Does this code shad some light on the trailing comma? :)
>
> >>> (1) == 1
> True
> >>> (1,) == 1
> False
> >>> type((1))
> <type 'int'>
> >>> type((1,))
> <type 'tuple'>
>
> >>> a = 1
> >>> a
> 1
> >>> a = (1)
> >>> a
> 1
> >>> a = (1,)
> >>> a
> (1,)
> >>> a = 1,
> >>> a
> (1,)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From clp2 at rebertia.com  Thu Feb 19 15:58:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 12:58:29 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
Message-ID: <50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>

On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi,
>
> I have a class derived from two parents (in blue below), which gives me the
> following error:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 291, in <module>
>     class ListControl(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
> Googling suggested I should add
> from noconflict import classmaker
> and
>
> __metaclass__=classmaker()
> to this class.
>
> However, I don't seem able to find where to get the noconflict module from.
>
> Do any of you where noconflict  could be downloaded/installed from ?

>From what I could google, you should in theory be able to fix the
problem (without using any 3rd party module) by doing:

class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
    pass

class ListControl(wx.Frame, CopyAndPaste):
    __metaclass__ = ListControlMeta
    #rest of class...

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mabdelkader at gmail.com  Thu Feb 19 16:01:55 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 19 Feb 2009 16:01:55 -0500
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <148918f0902191301n362878dbo20d868c662db168e@mail.gmail.com>

A comma is what generates a tuple. It's not the parenthesis;)
http://docs.python.org/library/stdtypes.html#typesseq

"A single item tuple must have a trailing comma, such as (d,)."

On Thu, Feb 19, 2009 at 3:57 PM, alex goretoy
<aleksandr.goretoy at gmail.com>wrote:

> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not mean
> to output newline after printed data?
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
>
>
> On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de>wrote:
>
>> Carl Schumann wrote:
>> > I could see the logic in always or never having a trailing comma.   What
>> > I don't understand here is why only the single element case has a
>> > trailing comma.   Any explanations please?
>>
>> Does this code shad some light on the trailing comma? :)
>>
>> >>> (1) == 1
>> True
>> >>> (1,) == 1
>> False
>> >>> type((1))
>> <type 'int'>
>> >>> type((1,))
>> <type 'tuple'>
>>
>> >>> a = 1
>> >>> a
>> 1
>> >>> a = (1)
>> >>> a
>> 1
>> >>> a = (1,)
>> >>> a
>> (1,)
>> >>> a = 1,
>> >>> a
>> (1,)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From rNOSPAMon at flownet.com  Thu Feb 19 16:02:39 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:02:39 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.281.1235073821.11746.python-list@python.org>
Message-ID: <rNOSPAMon-E63D31.13023919022009@news.gha.chartermi.net>

In article <mailman.281.1235073821.11746.python-list at python.org>,
 MRAB <google at mrabarnett.plus.com> wrote:

> Ron Garret wrote:
> > I'm trying to split a CamelCase string into its constituent components.  
> > This kind of works:
> > 
> >>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> > ['fo', 'a', 'az']
> > 
> > but it consumes the boundary characters.  To fix this I tried using 
> > lookahead and lookbehind patterns instead, but it doesn't work:
> > 
> >>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> > ['fooBarBaz']
> > 
> > However, it does seem to work with findall:
> > 
> >>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> > ['', '']
> > 
> > So the regular expression seems to be doing the Right Thing.  Is this a 
> > bug in re.split, or am I missing something?
> > 
> > (BTW, I tried looking at the source code for the re module, but I could 
> > not find the relevant code.  re.split calls sre_compile.compile().split, 
> > but the string 'split' does not appear in sre_compile.py.  So where does 
> > this method come from?)
> > 
> > I'm using Python2.5.
> > 
> I, amongst others, think it's a bug (or 'misfeature'); Guido thinks it
> might be intentional, but changing it could break some existing code.

That seems unlikely.  It would only break where people had code invoking 
re.split on empty matches, which at the moment is essentially a no-op.  
It's hard to imagine there's a lot of code like that around.  What would 
be the point?

> You could do this instead:
> 
>  >>> re.sub('(?<=[a-z])(?=[A-Z])', '@', 'fooBarBaz').split('@')
> ['foo', 'Bar', 'Baz']

Blech!  ;-)  But thanks for the suggestion.

rg


From rNOSPAMon at flownet.com  Thu Feb 19 16:03:59 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:03:59 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<gnkdal$bcq$01$1@news.t-online.com>
Message-ID: <rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net>

In article <gnkdal$bcq$01$1 at news.t-online.com>,
 Peter Otten <__peter__ at web.de> wrote:

> Ron Garret wrote:
> 
> > I'm trying to split a CamelCase string into its constituent components.
> 
> How about
> 
> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
> ['foo', 'Bar', 'Baz']

That's very clever.  Thanks!

> > (BTW, I tried looking at the source code for the re module, but I could
> > not find the relevant code.  re.split calls sre_compile.compile().split,
> > but the string 'split' does not appear in sre_compile.py.  So where does
> > this method come from?)
> 
> It's coded in C. The source is Modules/sremodule.c.

Ah.  Thanks!

rg


From clp2 at rebertia.com  Thu Feb 19 16:04:34 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 13:04:34 -0800
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <50697b2c0902191304u5dc6cf4dj797fc724faac2b74@mail.gmail.com>

> On Thu, Feb 19, 2009 at 2:54 PM, Christian Heimes <lists at cheimes.de> wrote:
>>
>> Carl Schumann wrote:
>> > I could see the logic in always or never having a trailing comma.   What
>> > I don't understand here is why only the single element case has a
>> > trailing comma.   Any explanations please?
>>
>> Does this code shad some light on the trailing comma? :)
>>
>> >>> (1) == 1
>> True
>> >>> (1,) == 1
>> False
>> >>> type((1))
>> <type 'int'>
>> >>> type((1,))
>> <type 'tuple'>
>>
>> >>> a = 1
>> >>> a
>> 1
>> >>> a = (1)
>> >>> a
>> 1
>> >>> a = (1,)
>> >>> a
>> (1,)
>> >>> a = 1,
>> >>> a
>> (1,)
>>
On Thu, Feb 19, 2009 at 12:57 PM, alex goretoy
<aleksandr.goretoy at gmail.com> wrote:
> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not mean to
> output newline after printed data?
>
> -Alex Goretoy
> http://www.goretoy.com

Yes it does (it outputs a space instead of a newline), but only with
the print-statement, not the print() function.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


From rNOSPAMon at flownet.com  Thu Feb 19 16:06:32 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:06:32 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.277.1235073073.11746.python-list@python.org>
Message-ID: <rNOSPAMon-C4EBDC.13063219022009@news.gha.chartermi.net>

In article <mailman.277.1235073073.11746.python-list at python.org>,
 "andrew cooke" <andrew at acooke.org> wrote:

> i wonder what fraction of people posting with "bug?" in their titles here
> actually find bugs?

IMHO it ought to be an invariant that len(r.split(s)) should always be 
one more than len(r.findall(s)).

> anyway, how about:
> 
> re.findall('[A-Z]?[a-z]*', 'fooBarBaz')
> 
> or
> 
> re.findall('([A-Z][a-z]*|[a-z]+)', 'fooBarBaz')

That will do it.  Thanks!

rg


From rNOSPAMon at flownet.com  Thu Feb 19 16:08:19 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 13:08:19 -0800
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.273.1235071607.11746.python-list@python.org>
Message-ID: <rNOSPAMon-2E6FA0.13081919022009@news.gha.chartermi.net>

In article <mailman.273.1235071607.11746.python-list at python.org>,
 Albert Hopkins <marduk at letterboxes.org> wrote:

> On Thu, 2009-02-19 at 10:55 -0800, Ron Garret wrote:
> > I'm trying to split a CamelCase string into its constituent components.  
> > This kind of works:
> > 
> > >>> re.split('[a-z][A-Z]', 'fooBarBaz')
> > ['fo', 'a', 'az']
> > 
> > but it consumes the boundary characters.  To fix this I tried using 
> > lookahead and lookbehind patterns instead, but it doesn't work:
> 
> That's how re.split works, same as str.split...

I think one could make the argument that 'foo'.split('') ought to return 
['f','o','o']

> 
> > >>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> > ['fooBarBaz']
> > 
> > However, it does seem to work with findall:
> > 
> > >>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> > ['', '']
> 
> 
> Wow!
> 
> To tell you the truth, I can't even read that...

It's a regexp.  Of course you can't read it.  ;-)

rg


From steve at holdenweb.com  Thu Feb 19 16:08:37 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 16:08:37 -0500
Subject: Explanation for trailing comma in example from Learning Python?
In-Reply-To: <fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
References: <499DB73D.1010208@fnal.gov> <gnkgua$cr1$1@ger.gmane.org>
	<fa98a9e30902191257i8ee8515s4ee63d3dd204599a@mail.gmail.com>
Message-ID: <gnkhol$g8g$2@ger.gmane.org>

alex goretoy wrote:
> Thank you for clerification Christian,
> when using trailing comma with print statement/function, does it not
> mean to output newline after printed data?
> 
It does (in Python before 3.0) - but that has nothing to do with the
original question. You will find you get quite different results for

print 1,         # print integer 1 followed by no newline

and

print (1, )      # print the one-element tuple whose element
                 # is the integer 1, followed by a newline.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Thu Feb 19 16:31:51 2009
From: lionel.keene at gmail.com (Lionel)
Date: Thu, 19 Feb 2009 13:31:51 -0800 (PST)
Subject: numpy.memmap advice?
References: <bb0aecc9-2a08-4907-afa2-94f303e72a22@u8g2000prd.googlegroups.com>
	<59449976-a334-411a-bdc8-7e6041bd4a37@g1g2000pra.googlegroups.com> 
	<a17109bc-c615-4a8b-93f4-8ab005d578e8@q40g2000prh.googlegroups.com> 
	<66395359-fca2-4e31-8ff9-5fbf51654d1b@v38g2000yqb.googlegroups.com> 
	<e152a045-9eec-4097-96df-fa8878f31a09@w1g2000prk.googlegroups.com> 
	<10c6209b-5f23-4709-840f-ade7b734be8b@s24g2000vbp.googlegroups.com> 
	<3008b9b3-9e23-4fc2-bd5d-286da7c0953f@u39g2000prn.googlegroups.com> 
	<d5ca741f-66e8-4a38-ba1f-61bce976f751@b16g2000yqb.googlegroups.com>
Message-ID: <32a9bd0a-4355-4a02-819c-8ed90b7e8256@g1g2000pra.googlegroups.com>

On Feb 19, 12:26?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 19, 10:36?am, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 19, 9:51?am, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > On Feb 19, 9:34?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > On Feb 18, 12:35?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
>
> > > > > On Feb 18, 10:48?am, Lionel <lionel.ke... at gmail.com> wrote:
>
> > > > > > Thanks Carl, I like your solution. Am I correct in my understanding
> > > > > > that memory is allocated at the slicing step in your example i.e. when
> > > > > > "reshaped_data" is sliced using "interesting_data = reshaped_data[:,
> > > > > > 50:100]"? In other words, given a huge (say 1Gb) file, a memmap object
> > > > > > is constructed that memmaps the entire file. Some relatively small
> > > > > > amount of memory is allocated for the memmap operation, but the bulk
> > > > > > memory allocation occurs when I generate my final numpy sub-array by
> > > > > > slicing, and this accounts for the memory efficiency of using memmap?
>
> > > > > No, what accounts for the memory efficienty is there is no bulk
> > > > > allocation at all. ?The ndarray you have points to the memory that's
> > > > > in the mmap. ?There is no copying data or separate array allocation.
>
> > > > Does this mean that everytime I iterate through an ndarray that is
> > > > sourced from a memmap, the data is read from the disc? The sliced
> > > > array is at no time wholly resident in memory? What are the
> > > > performance implications of this?
>
> > > Ok, sorry for the confusion. ?What I should have said is that there is
> > > no bulk allocation *by numpy* at all. ?The call to mmap does allocate
> > > a chunk of RAM to reflect file contents, but the numpy arrays don't
> > > allocate any memory of their own: they use the same memory as was
> > > allocated by the mmap call.
>
> > > Carl Banks- Hide quoted text -
>
> > > - Show quoted text -
>
> > Thanks for the explanations Carl. I'm sorry, but it's me who's the
> > confused one here, not anyone else :-)
>
> > I hate to waste everyone's time again, but something is just not
> > "clicking" in that black-hole I call a brain. So..."numpy.memmap"
> > allocates a chunk off the heap to coincide with the file contents. If
> > I memmap the entire 1 Gb file, a corresponding amount (approx. 1 Gb)
> > is allocated? That seems to contradict what is stated in the numpy
> > documentation:
>
> > "class numpy.memmap
> > Create a memory-map to an array stored in a file on disk.
>
> > Memory-mapped files are used for accessing small segments of large
> > files on disk, without reading the entire file into memory."
>
> Yes, it allocates room for the whole file in your process's LOGICAL
> address space. ?However, it doesn't actually reserve any PHYSICAL
> memory, or read in any data from the disk, until you've actually
> access the data. ?And then it only reads small chunks in, not the
> whole file.
>
> So when you mmap your 1GB file, the OS sets aside a 1 GB chunk of
> address to use for your memory map. ?That's all it does: it doesn't
> read anything from disk, it doesn't reserve any physical RAM. ?Later,
> when you access a byte in the mmap via a pointer, the OS notes that it
> hasn't yet loaded the data at that address, so it grabs a small chunk
> of physical ram and reads in the a small amount of data from the disk
> containing the byte you are accessing. ?This all happens automatically
> and transparently to you.
>
> > In my previous example that we were working with (100x100 data file),
> > you used an offset to memmap the "lower-half" of the array. Does this
> > mean that in the process of memmapping that lower half, RAM was set
> > aside for 50x100 32-bit complex numbers? If so, and I decide to memmap
> > an entire file, there is no memory benefit in doing so.
>
> The mmap call sets aside room for all 100x100 32-bit complex numbers
> in logical address space, regardless of whether you use the offset
> parameter or not. ?However, it might only read in part of the file in
> from disk, and will only reserve physical RAM for the parts it reads
> in.
>
> > At this point do you (or anyone else) recommend I just write a little
> > function for my class that takes the coords I intend to load and "roll
> > my own" function? Seems like the best way to keep memory to a minimum,
> > I'm just worried about performance. On the other hand, the most I'd be
> > loading would be around 1k x 1k worth of data.-
>
> No, if your file is not too large to mmap, just do it the way you've
> been doing it. ?The documentation you've been reading is pretty much
> correct, even if you approach it naively. ?It is both memory and I/O
> efficient. ?You're overthinking things here; don't try to outsmart the
> operating system. ?It'll take care of the performance issues
> satisfactorily.
>
> The only thing you have to worry about is if the file is too large to
> fit into your process's logical address space, which on a typical 32-
> bit system is 2-3 GB (depending on configuration) minus the space
> occupied by Python and other heap objects, which is probably only a
> few MB.
>
> Carl Banks- Hide quoted text -
>
> - Show quoted text -

I see. That was very well explained Carl, thank you.


From andreas.schawo at googlemail.com  Thu Feb 19 16:47:23 2009
From: andreas.schawo at googlemail.com (Andy)
Date: Thu, 19 Feb 2009 13:47:23 -0800 (PST)
Subject: Regression test test_site failed on current trunk
References: <c5cddbfe-7bb5-4d4c-bc35-36a5cb91f014@j8g2000yql.googlegroups.com>
	<mailman.286.1235076484.11746.python-list@python.org>
Message-ID: <b92a52b8-1783-4a2b-b467-6548798c726d@j1g2000yqi.googlegroups.com>

On 19 Feb., 21:47, Steve Holden <st... at holdenweb.com> wrote:

> Do you mean you can't get previous lines in your Python command history
> to show up? This sounds as though you may not have built the readline
> support in to your experimental build. I can't remember exactly what the
> deal is, but I know that readline is GPL licensed, so it may not come as
> part of the standard distribution.

Thanks for your reply.
I just want to move left and right with the cursor keys.
Thats it.
I installed libreadline5-dev and rerun ./configure and make
...now it works.




From oamram at gmail.com  Thu Feb 19 16:56:38 2009
From: oamram at gmail.com (oamram)
Date: Thu, 19 Feb 2009 13:56:38 -0800 (PST)
Subject: iterating through files
Message-ID: <22048070.post@talk.nabble.com>


Hi Pythonist,
new to python. i have a directory with about 50 text file and i need to
iterate through them and get 
line 7 to 11 from each file and write those lines into another file(one file
that will contain all lines).

Cheers, Omer.
-- 
View this message in context: http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From woodygar at sky.com  Thu Feb 19 17:07:01 2009
From: woodygar at sky.com (Gary Wood)
Date: Thu, 19 Feb 2009 22:07:01 -0000
Subject: No subject
Message-ID: <6307CF549D1943C0802D29730A70BD99@Woodygar>

 I'm stuck on a tutorial Hands on Python3
Exercise 1.13.7.3. ** Complete the following function. This starting code is in joinAllStub.py. Save it to the new name joinAll.py. Note the way an example is given in the documentation string. It simulates the use of the function in the Shell. This is a common convention: 

import string
'''exercise to complete and test this function'''
def joinStrings(sentance):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
     # finish the code for this function
# i tried this but not sure whats mising
    for i in sentance:
        print(i)
    
    
   #this worked for numbers      
   # def sumList(nums):                                #1 
   # '''Return the sum of the numbers in nums.'''   
    #sum = 0                                       #2 
   # for num in nums:                              #3 
   #     sum = sum + num                           #4 
  #  return sum   
    
       
   
    


def main():
    print(joinStrings(['very','hot' ,'day']))
    print(joinStrings(['this', 'is', 'it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()
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From http  Thu Feb 19 17:11:31 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 14:11:31 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <7x3aeadqlo.fsf@ruckus.brouhaha.com>

Falcolas <garrickp at gmail.com> writes:
> That's fair, but by using a high level language in the first place,
> you've already made the conscious decision to sacrifice speed for ease
> of programming. Otherwise, you would probably be programming in C.

That Python is so much slower than C is yet another area where Python
can use improvement.  

> It's a proposition that used to bother me, until I did some actual
> programming of real world problems in Python. I've yet to really find
> a case where the application was slow enough to justify the cost of
> using multiple Python processes.

Right, that's basically the issue here: the cost of using multiple
Python processes is unnecessarily high.  If that cost were lower then
we could more easily use multiple cores to make oru apps faster.


From clp2 at rebertia.com  Thu Feb 19 17:11:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 14:11:48 -0800
Subject: No subject
In-Reply-To: <6307CF549D1943C0802D29730A70BD99@Woodygar>
References: <6307CF549D1943C0802D29730A70BD99@Woodygar>
Message-ID: <50697b2c0902191411q61ef08d2tb3de31aaf152b78a@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:07 PM, Gary Wood <woodygar at sky.com> wrote:
>  I'm stuck on a tutorial Hands on Python3
>
> Exercise 1.13.7.3. ** Complete the following function. This starting code is
> in joinAllStub.py. Save it to the new name joinAll.py. Note the way an
> example is given in the documentation string. It simulates the use of the
> function in the Shell. This is a common convention:
>
> import string
> '''exercise to complete and test this function'''
> def joinStrings(sentance):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>      # finish the code for this function
> # i tried this but not sure whats mising
>     for i in sentance:
>         print(i)

You're not supposed to output the strings, you've supposed to combine
them and return the single combined string (it's nearly identical to
how you summed the numbers). The printing is done by the calls to
print() outside of this function.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From rushenaly at gmail.com  Thu Feb 19 17:18:34 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Thu, 19 Feb 2009 14:18:34 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>

Hi again

I really want to imply that i am not in search of a perfect language.
Python for programming productivity is a great language but there are
some real world facts. Some people want a language that provides great
flexibility. A language can provide threads and processes and
programmer choose the way. I really believe that GIL is a design
error.

Thanks.

Rushen


From vriolk at gmail.com  Thu Feb 19 17:20:14 2009
From: vriolk at gmail.com (coldpizza)
Date: Thu, 19 Feb 2009 14:20:14 -0800 (PST)
Subject: Tkinter: stopping a background thread on demand
Message-ID: <03c4679e-014d-4fc7-976e-ba52312f99c2@41g2000yqf.googlegroups.com>

I am writing a Tk GUI for a console script. I start a background
thread and pass it a callback function which writes debug info to a
Text widget in the main Tk loop.

I tried to find what is the established way to cleanly abort a child
thread when the user clicks the Stop button, but apparently Python
does not allow the parent process to explicitly stop a child thread.
Also I could not figure out how a parent can send a signal for a child
to stop and let it cleanup and exit cleanly.

I finally figured out a solution which was to set a 'TERMINATE' flag
on the `func_dict` property of the callback function, and then check
for the flag in the child module, but I still have doubts that this is
the proper way to do this sort of thing.

This works fine but it looks more like a dirty hack to me so my
question is: what is the proper way to send a signal to a child thread
to gracefully terminate, assuming the user decided to cancel an
operation?

from Tkinter import *
import threading

root = Tk()

class ConverterThread(threading.Thread):
    def __init__(self, source, target, callbackFunc):
        threading.Thread.__init__(self, name='converterThread')
        self.infile = srcName
        self.outfile = destName
        self.callbackFunc = callbackFunc
    def run(self):
        import myconverter
        myconverter.convert(self.infile, self.outfile,
self.callbackFunc)

def stopConversion(event=None):
    global job
    if (job and job.isAlive()):
        callbackFunc.func_dict['TERMINATE'] = True
        job = None

def updateLogCallback(data=None):
        log.insert(END, str(data))
        log.see('end')

job = ConverterThread(src='file1', dest='file2, updateLogCallback)
job.start()

stopBtn = Button(root, text="Stop", command=stopConversion)
stopBtn.pack()
log = Text(root)
root.mainloop()


And the callbackFunc in myConverter.py looks like this:

def printCallback(data):
    if (callback):
        callback(data)
        if callback.func_dict['TERMINATE'] == True:
            clean_up()
            sys.exit()
    else:
        print data




From kyosohma at gmail.com  Thu Feb 19 17:22:21 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 14:22:21 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org>
Message-ID: <8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>

On Feb 19, 3:56?pm, oamram <oam... at gmail.com> wrote:
> Hi Pythonist,
> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one file
> that will contain all lines).
>
> Cheers, Omer.
> --
> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> Sent from the Python - python-list mailing list archive at Nabble.com.

I would recommend using the glob module to grab a list of the files
you want or you can just create your own list. Then use a loop to grab
the lines you want. Something like this:

f = open(textFile)
newFile = open(newFileName, "a")
x = 1
for line in f.readlines():
    if x >=7 and x <=11:
         newFile.write(line + "\n")

You could even put the above inside a loop that loops over the list of
files. Anyway, that's one approach. I'm sure there are many others.

Mike


From kyosohma at gmail.com  Thu Feb 19 17:28:25 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Thu, 19 Feb 2009 14:28:25 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org> 
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>
Message-ID: <b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>

On Feb 19, 4:22?pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> On Feb 19, 3:56?pm, oamram <oam... at gmail.com> wrote:
>
> > Hi Pythonist,
> > new to python. i have a directory with about 50 text file and i need to
> > iterate through them and get
> > line 7 to 11 from each file and write those lines into another file(one file
> > that will contain all lines).
>
> > Cheers, Omer.
> > --
> > View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> > Sent from the Python - python-list mailing list archive at Nabble.com.
>
> I would recommend using the glob module to grab a list of the files
> you want or you can just create your own list. Then use a loop to grab
> the lines you want. Something like this:
>
> f = open(textFile)
> newFile = open(newFileName, "a")
> x = 1
> for line in f.readlines():
> ? ? if x >=7 and x <=11:
> ? ? ? ? ?newFile.write(line + "\n")
>
> You could even put the above inside a loop that loops over the list of
> files. Anyway, that's one approach. I'm sure there are many others.
>
> Mike

Oops...I forgot to iterate the counter. The code should look like
this:

<code>

f = open(textFile)
newFile = open(newFileName, "a")
x = 1
for line in f.readlines():
    if x >=7 and x <=11:
         newFile.write(line + "\n")
    x +=1

</code>

Sorry about that.

Mike


From clp2 at rebertia.com  Thu Feb 19 17:33:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 14:33:55 -0800
Subject: iterating through files
In-Reply-To: <b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
References: <mailman.293.1235080603.11746.python-list@python.org>
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>
	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
Message-ID: <50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>

On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyosohma at gmail.com> wrote:
> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>>
>> > Hi Pythonist,
>> > new to python. i have a directory with about 50 text file and i need to
>> > iterate through them and get
>> > line 7 to 11 from each file and write those lines into another file(one file
>> > that will contain all lines).
>>
>> > Cheers, Omer.
>> > --
>> > View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
>> > Sent from the Python - python-list mailing list archive at Nabble.com.
>>
>> I would recommend using the glob module to grab a list of the files
>> you want or you can just create your own list. Then use a loop to grab
>> the lines you want. Something like this:
>>
>> f = open(textFile)
>> newFile = open(newFileName, "a")
>> x = 1
>> for line in f.readlines():
>>     if x >=7 and x <=11:
>>          newFile.write(line + "\n")
>>
>> You could even put the above inside a loop that loops over the list of
>> files. Anyway, that's one approach. I'm sure there are many others.
>>
>> Mike
>
> Oops...I forgot to iterate the counter. The code should look like
> this:
>
> <code>
>
> f = open(textFile)
> newFile = open(newFileName, "a")
> x = 1
> for line in f.readlines():
>    if x >=7 and x <=11:
>         newFile.write(line + "\n")
>    x +=1
>
> </code>

Or you could use enumerate(); also, readlines() isn't necessary:

f = open(textFile)
newFile = open(newFileName, "a")
for x, line in enumerate(f):
    if x >=7 and x <=11:
        newFile.write(line + "\n")

Sounds a bit like homework to me though...

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tim.wintle at teamrubber.com  Thu Feb 19 17:35:19 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 22:35:19 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
Message-ID: <1235082919.21735.30.camel@tim-laptop>

On Thu, 2009-02-19 at 12:48 -0800, Falcolas wrote:
> That's fair, but by using a high level language in the first place,
> you've already made the conscious decision to sacrifice speed for ease
> of programming. Otherwise, you would probably be programming in C.
My parents would have gone mad at me for saying that when I was young -
C is just about the highest-level language they ever used - Assembly/hex
all the way!

So if you really want speed then why don't you write your code in
assembly? That's the only "perfect language" - it's capable of doing
everything in the most efficient way possible on your machine.

Of course that's a hassle, so I guess you may as well use C, since
that's almost certainly only linearly worse than using assembly, and it
takes far less time to use.

Oh, but then you may as well use python, since (again) that's probably
only linearly worse than C, and well-programmed C at that - I certainly
wouldn't end up with some of the optimisations that have gone into the
python interpreter!

That's basically what my mind goes through whenever I choose a language
to use for a task - and why I almost always end up with Python.

> It's a proposition that used to bother me, until I did some actual
> programming of real world problems in Python. I've yet to really find
> a case where the application was slow enough to justify the cost of
> using multiple Python processes.

I deal with those situations a fair bit - but the solutions are normally
easy - if it's limited by waiting for IO then I use threads, if it's
limited by waiting for CPU time then I use multiple processes, or share
the job over another application (such as MySQL), or run a task over a
cluster.

If you have a task where the linear optimisation offered by multiple
cores is really important then you can either:
 * Run it over multiple processes, or multiple machines in Python
or
 * spend a year writing it in C or assembly, by which time you can buy a
new machine that will run it fine in Python.


Yes, we're coming to a point where we're going to have tens of cores in
a chip, but by that time someone far cleverer than me (possibly someone
who's on this list) will have solved that problem. The top experts in
many fields use Python, and if they weren't able to make use of multiple
core chips, then there wouldn't be any demand for them.

Tim Wintle


> 
> ~G
> --
> http://mail.python.org/mailman/listinfo/python-list



From digitig at gmail.com  Thu Feb 19 17:35:38 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 22:35:38 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <7x3aeadqlo.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <aee48b3c0902191435s56cedaa4mf6d810b1152d6548@mail.gmail.com>

2009/2/19 Paul Rubin <http>:

> That Python is so much slower than C is yet another area where Python
> can use improvement.

No, because we don't use Python where C would be more appropriate.
Sure nobody would complain if Python were faster, but it's not for
speed that we choose Python. Not speed of /execution/ that is.
Different languages have different trade-offs. Python's trade-offs
suit us. If they don't suit you, use a language with trade-offs that
do.


-- 
Tim Rowe


From digitig at gmail.com  Thu Feb 19 17:37:02 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 19 Feb 2009 22:37:02 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
Message-ID: <aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>

2009/2/19  <rushenaly at gmail.com>:
> Hi again
>
> I really want to imply that i am not in search of a perfect language.
> Python for programming productivity is a great language but there are
> some real world facts. Some people want a language that provides great
> flexibility. A language can provide threads and processes and
> programmer choose the way. I really believe that GIL is a design
> error.

It's only an error if it gets in the way. It's the experience of a lot
of programmers that it doesn't, so it's not an error.


-- 
Tim Rowe


From steve at holdenweb.com  Thu Feb 19 17:53:40 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 17:53:40 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
Message-ID: <gnkntk$608$1@ger.gmane.org>

Tim Rowe wrote:
> 2009/2/19  <rushenaly at gmail.com>:
>> Hi again
>>
>> I really want to imply that i am not in search of a perfect language.
>> Python for programming productivity is a great language but there are
>> some real world facts. Some people want a language that provides great
>> flexibility. A language can provide threads and processes and
>> programmer choose the way. I really believe that GIL is a design
>> error.
> 
> It's only an error if it gets in the way. It's the experience of a lot
> of programmers that it doesn't, so it's not an error.
> 
And it's not a feature of the language, rather of one or two
implementations. Neither JPython not IronPython use a GIL to the best of
my knowledge, so you are still quite at liberty to use them.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 17:56:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 17:56:30 -0500
Subject: iterating through files
In-Reply-To: <50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>
References: <mailman.293.1235080603.11746.python-list@python.org>	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com>	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com>
	<50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com>
Message-ID: <gnko2u$608$2@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyosohma at gmail.com> wrote:
>> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
>>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>>>
>>>> Hi Pythonist,
>>>> new to python. i have a directory with about 50 text file and i need to
>>>> iterate through them and get
>>>> line 7 to 11 from each file and write those lines into another file(one file
>>>> that will contain all lines).
>>>> Cheers, Omer.
>>>> --
>>>> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
>>>> Sent from the Python - python-list mailing list archive at Nabble.com.
>>> I would recommend using the glob module to grab a list of the files
>>> you want or you can just create your own list. Then use a loop to grab
>>> the lines you want. Something like this:
>>>
>>> f = open(textFile)
>>> newFile = open(newFileName, "a")
>>> x = 1
>>> for line in f.readlines():
>>>     if x >=7 and x <=11:
>>>          newFile.write(line + "\n")
>>>
>>> You could even put the above inside a loop that loops over the list of
>>> files. Anyway, that's one approach. I'm sure there are many others.
>>>
>>> Mike
>> Oops...I forgot to iterate the counter. The code should look like
>> this:
>>
>> <code>
>>
>> f = open(textFile)
>> newFile = open(newFileName, "a")
>> x = 1
>> for line in f.readlines():
>>    if x >=7 and x <=11:
>>         newFile.write(line + "\n")
>>    x +=1
>>
>> </code>
> 
> Or you could use enumerate(); also, readlines() isn't necessary:
> 
> f = open(textFile)
> newFile = open(newFileName, "a")
> for x, line in enumerate(f):
>     if x >=7 and x <=11:
>         newFile.write(line + "\n")
> 
> Sounds a bit like homework to me though...
> 
But all these solutions read the whole file.  You should really read six
lines throwing them away then read five lines to keep.

Since this might be homework I'll not write the code, but it will
involve f.next() ...

regards
  Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mensanator at aol.com  Thu Feb 19 18:05:22 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 15:05:22 -0800 (PST)
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org> 
	<8bba10d2-ac74-4ba0-a731-744238b77139@l39g2000yqn.googlegroups.com> 
	<b4d3467b-4b71-4abb-9b30-c7d09b67a970@h20g2000yqn.googlegroups.com> 
	<50697b2c0902191433k572b4c90v9bd05d815ae72eee@mail.gmail.com> 
	<mailman.301.1235084417.11746.python-list@python.org>
Message-ID: <3c5040c1-a130-4c51-94f0-08248d6193b6@j10g2000prn.googlegroups.com>

On Feb 19, 4:56?pm, Steve Holden <st... at holdenweb.com> wrote:
> Chris Rebert wrote:
> > On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyoso... at gmail.com> wrote:
> >> On Feb 19, 4:22 pm, Mike Driscoll <kyoso... at gmail.com> wrote:
> >>> On Feb 19, 3:56 pm, oamram <oam... at gmail.com> wrote:
>
> >>>> Hi Pythonist,
> >>>> new to python. i have a directory with about 50 text file and i need to
> >>>> iterate through them and get
> >>>> line 7 to 11 from each file and write those lines into another file(one file
> >>>> that will contain all lines).
> >>>> Cheers, Omer.
> >>>> --
> >>>> View this message in context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html
> >>>> Sent from the Python - python-list mailing list archive at Nabble.com.
> >>> I would recommend using the glob module to grab a list of the files
> >>> you want or you can just create your own list. Then use a loop to grab
> >>> the lines you want. Something like this:
>
> >>> f = open(textFile)
> >>> newFile = open(newFileName, "a")
> >>> x = 1
> >>> for line in f.readlines():
> >>> ? ? if x >=7 and x <=11:
> >>> ? ? ? ? ?newFile.write(line + "\n")
>
> >>> You could even put the above inside a loop that loops over the list of
> >>> files. Anyway, that's one approach. I'm sure there are many others.
>
> >>> Mike
> >> Oops...I forgot to iterate the counter. The code should look like
> >> this:
>
> >> <code>
>
> >> f = open(textFile)
> >> newFile = open(newFileName, "a")
> >> x = 1
> >> for line in f.readlines():
> >> ? ?if x >=7 and x <=11:
> >> ? ? ? ? newFile.write(line + "\n")
> >> ? ?x +=1
>
> >> </code>
>
> > Or you could use enumerate(); also, readlines() isn't necessary:
>
> > f = open(textFile)
> > newFile = open(newFileName, "a")
> > for x, line in enumerate(f):
> > ? ? if x >=7 and x <=11:
> > ? ? ? ? newFile.write(line + "\n")
>
> > Sounds a bit like homework to me though...
>
> But all these solutions read the whole file. ?You should really read six
> lines throwing them away then read five lines to keep.

It might be useful not to assume every file has at least 11 lines
and program accordingly.

>
> Since this might be homework I'll not write the code, but it will
> involve f.next() ...
>
> regards
> ? Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/- Hide quoted text -
>
> - Show quoted text -



From fabiofz at gmail.com  Thu Feb 19 18:11:19 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 19 Feb 2009 20:11:19 -0300
Subject: Pydev 1.4.3 Released
Message-ID: <cfb578b20902191511s829d924q83069fda919e0930@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.3 have been released

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com

Release Highlights in Pydev Extensions:
-----------------------------------------------------------------

* Fixed racing conditions in the context-insensitive indexing which
could corrupt the index.
* Search references working on Eclipse 3.3 and Eclipse 3.4
* Lambda properly treated as a new context for code-analysis
* Analysis is now recognizing __name__
* Analysis now marks variables used when accessed with augstore (+=)
* Some definitions were not properly indexed on some assign cases


Release Highlights in Pydev:
----------------------------------------------

* Interactive console The interpreter to be used can be chosen
* New modules can be created from templates
* Interpreter configuration improved!
      o Environment variables can be specified for a given interpreter
      o Canceling operation now works correctly

* Debugger
      o Variables correctly gotten on Jython 2.1 / 2.2
      o Using globals as an union of original globals+locals so that
generator expressions can be evaluated
      o Breakpoints only opened on double-click (no longer on select)

* The project preferences are now applied even if the page to
configure the project is not visible.
* Jython 2.5b1 working (problem with sitecustomize)
* Wrap paragraph fixed
* Set comprehension working on Python 3.0 parsing
* Find definition working when a module outside of the known pythonpath is found
* Source folders were not properly found sometimes -- when workspace
was not properly refreshed
* Invalid modules could get in the memory
* Getting the grammar version for a project could be wrong (and could
loose its indexing at that time)
* Multiple external zip files can be added at once to the pythonpath
* nonlocal added to keywords
* Fixed annoying problem where cursor was jumping when it shouldn't (outline)
* Fixed problem where the breakpoint could be lost (now, playing safe
and matching anything in the file if the context cannot be gotten)
* Ctrl + 2 + --reindex can be used to reindex all the opened projects
if the indexing becomes corrupt
* Changing nothing on project config and pressing OK no longer
reanalyzes the modules



What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From tim.wintle at teamrubber.com  Thu Feb 19 18:16:32 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 19 Feb 2009 23:16:32 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <7x8wo2kwoz.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <1235085392.21735.57.camel@tim-laptop>

On Thu, 2009-02-19 at 12:18 -0800, Paul Rubin wrote:
> If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

Kind of agree (although I use a netbook at lot at the moment, and I
don't use that because of speed-ups!)

> It used to be that new computers were faster than the old ones because
> they ran at higher clock rates.  That was great, no software changes
> at all were required to benefit from the higher speed.  Now, they get
> the additional speed by having more cores.  That's better than nothing
> but making use of it requires fixing the GIL.

My opinion on this (when talking about personal computers rather than
servers) is that:

(1)
Computers *appear* faster now because they have more cores - you can
have one doing the fancy GUI effects of Compiz etc. in the background,
while the other core actually does the work.

(2) 
Actual speedups aren't that related to either clock speed or cores at
the moment, they're related to the switch to 64-bit processors, the
massive increases in RAM and the increase in system bus speeds and other
IO (and of course graphics cards). I suspect that the next common
increase will be solid state hard disks.

e.g. I used to expect my computer to be paging all the time, although
I'd try to reduce it - these days I'm really upset when I see I've had
to page *anything* to disk!

Another massive increase (which I am willing to pay more for with the
work I do) is the processor cache - at first it was amazing when we got
significant level2 cache advertised on pc equipment, now I can fit
massive amounts of code into my 4mb level-2 cache *on my laptop*! That's
a huge impact for numerical work.

(3)
Multiple cores scale processing power linearly at best with the number
of cores (since you're normally going to be IO based at some point).
Perhaps the GIL will be relaxed a bit, but it's not going to have a
massive effect.

Tim Wintle




From Scott.Daniels at Acm.Org  Thu Feb 19 18:19:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 15:19:42 -0800
Subject: Threading and tkinter
In-Reply-To: <bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org>
	<90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
	<mailman.234.1235039030.11746.python-list@python.org>
	<bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
Message-ID: <N-OdnZ7PF6nidQDUnZ2dnUVZ_haWnZ2d@pdx.net>

gert wrote:
> Hope you do not mind ignoring part of answers, so I can figure out
> more why things work the way they are.
> This two examples work, what i do not understand is that in function
> display i do not have to declare root, v or x ?
...
> 
> x=0
> def weegbrug():
>     global x
>     while True:
>         x=x+1
>         sleep(0.5)
> start_new_thread(weegbrug,())
> 
> def display():
>     v.set(x)
>     root.after(500, lambda:display())
1) Note that x, v, and root are read and manipulated, but not written.
    So, they do not need to be declared global (global is only needed
    to declare writable global names).
2) The last statement could more easily be written:
    root.after(500, display)
...
> root.after(500, lambda:display())
Again you can write this:
    root.after(500, display)

--Scott David Daniels
Scott.Daniels at Acm.Org


From mensanator at aol.com  Thu Feb 19 18:19:51 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 15:19:51 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>

On Feb 19, 2:18?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> sturlamolden <sturlamol... at yahoo.no> writes:
> > Yes, the GIL prevents Python threads from being used in a certain way.
> > But do you really need to use threads like that? Or do you just think
> > you do?
>
> How old is your computer, why did you buy it, and is it the first one
> you ever owned?
>
> For most of us, I suspect, it is not our first one, and we bought it
> to get a processing speedup relative to the previous one. ?If such
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, so we have to
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.
>
> It used to be that new computers were faster than the old ones because
> they ran at higher clock rates. ?That was great, no software changes
> at all were required to benefit from the higher speed. ?Now, they get
> the additional speed by having more cores. ?That's better than nothing
> but making use of it requires fixing the GIL.

When I run I Python program, the Windows task manager shows both
cores running (usually a 60/40 split) for an overall 50% usage.

What am I actually seeing? If Python only uses one of the cores,
why do both light up? Is everything much more complicated (due to
OS scheduling, etc.) than the simple explanations of GIL?


From http  Thu Feb 19 18:20:51 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 15:20:51 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
Message-ID: <7xmyci3tf0.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> > That Python is so much slower than C is yet another area where Python
> > can use improvement.
> 
> No, because we don't use Python where C would be more appropriate.

C is basically never appropriate.  C should be outlawed by Congress
with the ban enforced by roving pie-throwing squads <wink>.  If a
Python program is too slow, making Python faster is far preferable to
switching to C.

> Sure nobody would complain if Python were faster, but it's not for
> speed that we choose Python. Not speed of /execution/ that is.

I would say, slow execution is a drawback that we put up with in order
to gain benefits of Python programming that are mostly unrelated to
the causes of the slowness.  The slowness itself can be addressed by
technical means, such as native-code compilation and eliminating the
GIL.  I believe (for example) that the PyPy project is doing both of
these.

> Different languages have different trade-offs. Python's trade-offs
> suit us. If they don't suit you, use a language with trade-offs that
> do.

I don't think Python's slowness is inherent in the language.  It's
mostly a shortcoming of the implementation that should be fixed like
any other such shortcoming.


From garrickp at gmail.com  Thu Feb 19 18:23:40 2009
From: garrickp at gmail.com (Falcolas)
Date: Thu, 19 Feb 2009 15:23:40 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <33017207-bc5c-45e5-8795-516329ac172c@p2g2000prf.googlegroups.com>

On Feb 19, 3:11?pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Falcolas <garri... at gmail.com> writes:
> > It's a proposition that used to bother me, until I did some actual
> > programming of real world problems in Python. I've yet to really find
> > a case where the application was slow enough to justify the cost of
> > using multiple Python processes.
>
> Right, that's basically the issue here: the cost of using multiple
> Python processes is unnecessarily high. ?If that cost were lower then
> we could more easily use multiple cores to make oru apps faster.

I was actually referring to the time cost of researching or developing
a parallel execution algorithm which would be suitable for multiple
processes.

The system overhead of using the Python multiprocess module is fairly
negligible for the systems I work on.

> Different languages have different trade-offs. Python's trade-offs
> suit us. If they don't suit you, use a language with trade-offs that
> do.

+1

~G


From http  Thu Feb 19 18:29:40 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 15:29:40 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<mailman.299.1235083025.11746.python-list@python.org>
Message-ID: <7xiqn63t0b.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> > I really believe that GIL is a design error.
> It's only an error if it gets in the way. It's the experience of a lot
> of programmers that it doesn't, so it's not an error.

It does get in the way of quite a few of us, but I wouldn't exactly
call it an error.  It was a sensible decision at the time it was made.
Changing technology and changing requirements have turned it into a
problem since then.  

A sensible decision later becoming a problem is a fairly normal
occurrence, not just in software but in just about every area of human
endeavor.  The sensible response to the changed landscape is to
recognize the problem and figure out what to do about it.  Denying the
problem's existence is not sensible.


From Scott.Daniels at Acm.Org  Thu Feb 19 18:31:00 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 15:31:00 -0800
Subject: os.fdopen giving "Invalid Argument" from pipes
In-Reply-To: <mailman.261.1235062412.11746.python-list@python.org>
References: <20090219165004.12853.832529843.divmod.quotient.11854@henry.divmod.com>
	<mailman.261.1235062412.11746.python-list@python.org>
Message-ID: <-c2dnbTIibu4dgDUnZ2dnUVZ_vCdnZ2d@pdx.net>

Tim Wintle wrote:
> On Thu, 2009-02-19 at 11:50 -0500, Jean-Paul Calderone wrote: ...
>> (also, i before e *except* after c et cetera).  Flip 'em around and
>> all is well.
> 
> Thanks - never was great at speling :-)

I used to be great at spelling until I became a programmer.  Programming
rewards consistency in spelling over correctness.  Spelling "recievers"
the same way 1000 times is better than getting it correct 999 times and
"wrong" once. :-)

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Thu Feb 19 18:34:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 18:34:28 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <1235085392.21735.57.camel@tim-laptop>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<1235085392.21735.57.camel@tim-laptop>
Message-ID: <gnkqa4$dm7$1@ger.gmane.org>

Tim Wintle wrote:
> On Thu, 2009-02-19 at 12:18 -0800, Paul Rubin wrote:
>> If such
>> speedups were useless or unimportant, we would not have blown our hard
>> earned cash replacing perfectly good older hardware, so we have to
>> accept the concept that speed matters and ignore those platitudes that
>> say otherwise.
> 
> Kind of agree (although I use a netbook at lot at the moment, and I
> don't use that because of speed-ups!)
[...]
> (3)
> Multiple cores scale processing power linearly at best with the number
> of cores (since you're normally going to be IO based at some point).
> Perhaps the GIL will be relaxed a bit, but it's not going to have a
> massive effect.
> 
There are significant classes of problems which *are* compute bound, and
as computers are applied more and more to planning and design problems
it seems likely that kind of application will become more significant.

In twenty years time our laptops will probably be continually optimizing
aspects of our lives using advanced linear algebra algorithms over
matrices with hundreds or thousands of millions of elements. I wouldn't
like Python to be excluded from solving such problems, and others we
currently fail to foresee.

Though my own interest does tend to lie in the areas where interaction
of various kinds dominates the need for large chunks of processing
power, I can't ignore the obvious. Many compute-bound problems do exist,
and they are important.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Thu Feb 19 18:38:21 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 00:38:21 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <gnkqhd$e5j$1@ger.gmane.org>

Mensanator wrote:
> When I run I Python program, the Windows task manager shows both
> cores running (usually a 60/40 split) for an overall 50% usage.
> 
> What am I actually seeing? If Python only uses one of the cores,
> why do both light up? Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

A Python *program* can utilize more than one core, just Python *code*
can't run on multiple cores in parallel. Everytime a C function calls
code that doesn't use the Python API it can chose to release the GIL.
That way a Python program can wrap a library and use as many cores as
possible.

Christian



From steve at holdenweb.com  Thu Feb 19 18:45:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 18:45:30 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xmyci3tf0.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <gnkquq$fas$1@ger.gmane.org>

Paul Rubin wrote:
> Tim Rowe <digitig at gmail.com> writes:
>>> That Python is so much slower than C is yet another area where Python
>>> can use improvement.
>> No, because we don't use Python where C would be more appropriate.
> 
> C is basically never appropriate.  C should be outlawed by Congress
> with the ban enforced by roving pie-throwing squads <wink>.  If a
> Python program is too slow, making Python faster is far preferable to
> switching to C.
> 
Unfortunately it's also far more difficult. I speak with the experience
of the "Need for Speed" sprint behind me: the accumulated brainpower at
that event should have been able to pick all the low-hanging fruit, and
yet the resultant net speedup was worthwhile, but definitely not immense.

>> Sure nobody would complain if Python were faster, but it's not for
>> speed that we choose Python. Not speed of /execution/ that is.
> 
> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness.  The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL.  I believe (for example) that the PyPy project is doing both of
> these.
> 
And IronPython and JPython already have. (How many times do I have to
say this before somebody with access to decent multi-processor hardware
runs some actual benchmarks?  Where's snakebite.org when you need it? ;-)

>> Different languages have different trade-offs. Python's trade-offs
>> suit us. If they don't suit you, use a language with trade-offs that
>> do.
> 
> I don't think Python's slowness is inherent in the language.  It's
> mostly a shortcoming of the implementation that should be fixed like
> any other such shortcoming.

Reasonable, and true. Some people talk about the GIL as though it were
something other than an implementation artifact.

What Guido doesn't seem to have accepted yet is that slowing [C]Python
down by 50% on a single-processor CPU will actually be a worthwhile
tradeoff in ten years time, when nothing will have less than eight cores
and the big boys will be running at 64 kilo-cores.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From google at mrabarnett.plus.com  Thu Feb 19 18:52:12 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 19 Feb 2009 23:52:12 +0000
Subject: Will multithreading make python less popular?
In-Reply-To: <1235082919.21735.30.camel@tim-laptop>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<1235082919.21735.30.camel@tim-laptop>
Message-ID: <499DF0AC.2030306@mrabarnett.plus.com>

Tim Wintle wrote:
[snip]
> Yes, we're coming to a point where we're going to have tens of cores in
> a chip, but by that time someone far cleverer than me (possibly someone
> who's on this list) will have solved that problem. The top experts in
> many fields use Python, and if they weren't able to make use of multiple
> core chips, then there wouldn't be any demand for them.
> 
Perhaps we should ask Guido who it is; after all, he's the one with the
time machine! :-)


From tjreedy at udel.edu  Thu Feb 19 18:58:57 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 19 Feb 2009 18:58:57 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xmyci3tf0.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <gnkrns$he0$1@ger.gmane.org>

Paul Rubin wrote:

> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness.  The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL.

Given that the GIL remains to make Python run faster in the usual (up to 
now, at least) case of 1 processor, that seems a strange statement.



From Scott.Daniels at Acm.Org  Thu Feb 19 19:01:34 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 16:01:34 -0800
Subject: Strange array.array performance
In-Reply-To: <mailman.278.1235073207.11746.python-list@python.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
Message-ID: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>

Maxim Khitrov wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case....
> The only feature that I'm missing with array.array is the ability to
> quickly pre-allocate large chunks of memory. To do that right now I'm
> using array('d', (0,) * size). It would be nice if array accepted an
> int as the second argument indicating how much memory to allocate and
> initialize to 0.

In the meantime, you could write a function (to ease the shift to numpy)
and reduce your interface problem to a very small set of lines:
     def zeroes_d(n):
         '''Allocate a n-element vector of 'd' elements'''
         vector = array.array('d') # fromstring has no performance bug
         vector.fromstring(n * 8 * '\0')
         return vector
Once numpy is up and running on 2.6, this should be easy to convert
to a call to zeroes.

--Scott David Daniels
Scott.Daniels at Acm.Org


From steve at holdenweb.com  Thu Feb 19 19:13:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:13:57 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <gnkrns$he0$1@ger.gmane.org>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<gnkrns$he0$1@ger.gmane.org>
Message-ID: <gnksk4$k0e$1@ger.gmane.org>

Terry Reedy wrote:
> Paul Rubin wrote:
> 
>> I would say, slow execution is a drawback that we put up with in order
>> to gain benefits of Python programming that are mostly unrelated to
>> the causes of the slowness.  The slowness itself can be addressed by
>> technical means, such as native-code compilation and eliminating the
>> GIL.
> 
> Given that the GIL remains to make Python run faster in the usual (up to
> now, at least) case of 1 processor, that seems a strange statement.
> 
>From a historical perspective, that's going to seem like a very
parochial PoV in (say) twenty years.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 19:15:22 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:15:22 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xiqn63t0b.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>	<mailman.299.1235083025.11746.python-list@python.org>
	<7xiqn63t0b.fsf@ruckus.brouhaha.com>
Message-ID: <gnksmq$k0e$2@ger.gmane.org>

Paul Rubin wrote:
> Tim Rowe <digitig at gmail.com> writes:
>>> I really believe that GIL is a design error.
>> It's only an error if it gets in the way. It's the experience of a lot
>> of programmers that it doesn't, so it's not an error.
> 
> [...]  Denying the
> problem's existence is not sensible.

And if wishes were horses then beggars would ride :-)
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From http  Thu Feb 19 19:16:24 2009
From: http (Paul Rubin)
Date: 19 Feb 2009 16:16:24 -0800
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.308.1235087951.11746.python-list@python.org>
Message-ID: <7xbpsyj73b.fsf@ruckus.brouhaha.com>

Terry Reedy <tjreedy at udel.edu> writes:
> > The slowness itself can be addressed by technical means, such as
> > native-code compilation and eliminating the GIL.
> 
> Given that the GIL remains to make Python run faster in the usual (up
> to now, at least) case of 1 processor, that seems a strange statement.

We've had this discussion before.  The 1-processor slowdown that you
refer to comes from replacing the GIL with the blunt instrument of a
lock around each reference count operation.  That has the advantage of
not breaking CPython in a million places, but has the drawback of
taking a big performance hit.  The long term fix is to replace
reference counts with a tracing GC.  That is apparently not feasible
in the framework of CPython and the many extension modules that have
been written for it, so it would have to be accompanied by an
implementation switch (e.g. PyPy).

Steve Holden has mentioned Jython and Ironpython a few times in this
thread.  Those are reasonable proofs of the concept of a GIL-less
Python, but for various reasons (spelled J-V-M and W-i-n-d-o-w-s) are
not all that suitable for many current Python users.


From steve at holdenweb.com  Thu Feb 19 19:17:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 19:17:12 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <499DF0AC.2030306@mrabarnett.plus.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<1235082919.21735.30.camel@tim-laptop>
	<499DF0AC.2030306@mrabarnett.plus.com>
Message-ID: <499DF688.2050303@holdenweb.com>

MRAB wrote:
> Tim Wintle wrote:
> [snip]
>> Yes, we're coming to a point where we're going to have tens of cores in
>> a chip, but by that time someone far cleverer than me (possibly someone
>> who's on this list) will have solved that problem. The top experts in
>> many fields use Python, and if they weren't able to make use of multiple
>> core chips, then there wouldn't be any demand for them.
>>
> Perhaps we should ask Guido who it is; after all, he's the one with the
> time machine! :-)

But he clearly hasn't been using it lately.

<heresy>Perhaps it's time Python stopped being a dictatorship?</heresy>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From wuwei23 at gmail.com  Thu Feb 19 19:44:18 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 19 Feb 2009 16:44:18 -0800 (PST)
Subject: Newby Question for reading a file
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>
	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com> 
	<gnkceu$5i9$02$1@news.t-online.com>
Message-ID: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>

On Feb 20, 5:38?am, Peter Otten <__pete... at web.de> wrote:
> Yes you can get portions of the line by slicing:
>
> for line in open("infile"):
> ? ? if line[8:18] != line[18:28]:
> ? ? ? ? ? ? print line,

You can also name the slices, which makes the code more clear (IMO):

endda = slice(8,18)
begda = slice(18,28)
for line in open("infile"):
    if line[endda] != line[begda]:
            print line,

> Or you can use the struct module:

But this is the approach I'd take.


From steve at holdenweb.com  Thu Feb 19 20:18:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:18:32 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <gnl0d8$ss8$1@ger.gmane.org>

Mensanator wrote:
> On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
[...]
> When I run I Python program, the Windows task manager shows both
> cores running (usually a 60/40 split) for an overall 50% usage.
> 
> What am I actually seeing? If Python only uses one of the cores,
> why do both light up? Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

You are seeing your Python program running on one core, and the usual
Windows crap keeping the other one busy.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From brent.r.nash at jpl.nasa.gov  Thu Feb 19 20:22:53 2009
From: brent.r.nash at jpl.nasa.gov (Nash, Brent R)
Date: Thu, 19 Feb 2009 17:22:53 -0800
Subject: matplotlib issue: cannot auto-scale X axis of plop properly
Message-ID: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>

Hey everyone,

I'm fairly new to matplotlib, but have read through tons of the documentation today and have a decent understanding of it.  All the auto-scaling, xlim, and x_bound stuff works fine for me with the examples, but as soon as I try to use it on my data, it's not working for me.  I've attached a demo script, 2 input files of data, and a PNG showing the resulting chart I get.  The numbers on my Y-axis range from 7656 to 59928 (a difference of 52272) and the numbers on my X-axis range from 1.22896144017e+12 to 1.22896155012e+12 (a difference of 109950).

The plot should look like a monotonically increasing line, but the resulting plot always comes out looking like a vertical line.  I realize that the plot is actually correct, the problem is the default scaling on the ouptut.  The easy way to justify this to yourself is to take the line "ert = float(i)" in the script and replace it with "ert = float(i)  - 1228960000000" to reduce the ert #'s to a manageable size and then everything plots very nicely.  The data is all linear, not logarithmic or anything, so I don't think writing a custom scaler is the solution.

I left commented out sections in my script of all the different methods I've tried to scale this thing.  I've tried all permutations I could think of for the following functions:

matplotlib.pyplot.axes().autoscale_view(...)
matplotlib.pyplot.axes().set_xbound(...)
matplotlib.pyplot.axes().set_xlim(...)
matplotlib.pyplot.axes().set_aspect(...)
matplotlib.pyplot.axis(...)
matplotlib.pyplot.axes().set_xscale(...)

Can anyone catch what I'm doing wrong here?  I'm hoping it's just something obvious due to my unfamiliarity with the tool.

Is there any way to write my own custom autoscale algorithm?

Thanks very much for your time/help!

~Brent

PS ~ Here's my OS info:

MacBook Pro Laptop
Mac O X 10.5.6
2.6 GHz Intel Core 2 Duo
4GB 667 MHz DDR2 SDRAM
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From hellyj at ucsd.edu  Thu Feb 19 20:32:25 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 17:32:25 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-CE2288.11164519022009@ger.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
Message-ID: <454D3724-D479-4B73-8BFB-FDA9A8E54EE7@ucsd.edu>

Thanks very much.  I'll give it a go.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

On Feb 19, 2009, at 11:16 AM, Ned Deily wrote:

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory  
> of
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).
> That site-packages directory is /Library/Python/2.5. The Apple- 
> supplied
> python comes with a sym link from /usr/bin/python.  If you launch it,
> you'll probably find GDAL is there as expected.
>
> If you do want to use the python.org python, which is somewhat newer,
> you need to install its own version of setuptools/easy_install and use
> it to install GDAL to the site-packages directory of that python which
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site- 
> pack
> ages.  The two python instances co-exist.  To install another
  easy_install, ensure the python.org python comes first on your
> PATH, then follow the instructions here:
>   <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory
of the python.org python framework.  So to ensure you are using that
easy_install and that python, make sure that bin directory is on your
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin: 
$PATH"

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list



From mkhitrov at gmail.com  Thu Feb 19 20:39:08 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 20:39:08 -0500
Subject: Strange array.array performance
In-Reply-To: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
Message-ID: <26ddd1750902191739j5bcab830l865d6f04b869cd9a@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:01 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com>
>> wrote:
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case....
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size). It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> In the meantime, you could write a function (to ease the shift to numpy)
> and reduce your interface problem to a very small set of lines:
>    def zeroes_d(n):
>        '''Allocate a n-element vector of 'd' elements'''
>        vector = array.array('d') # fromstring has no performance bug
>        vector.fromstring(n * 8 * '\0')
>        return vector
> Once numpy is up and running on 2.6, this should be easy to convert
> to a call to zeroes.

If I do decide to transition at any point, it will require much
greater modification. For example, to speed-up retrieval of data from
Matlab, which is returned to me as an mxArray structure, I allocate an
array.array for it and then use ctypes.memmove to copy data directly
into the array's buffer (address obtained through buffer_info()).

Same thing for sending data, rather than allocate a separate mxArray,
copy data, and then send, I create an empty mxArray and set its data
pointer to the array's buffer. I'm sure that there are equivalents in
numpy, but the point is that the transition, which currently would not
benefit my code in any significant way, will not be a quick change.

On the other hand, I have to thank you for the fromstring example. For
some reason, it never occurred to me that creating a string of nulls
would be much faster than a tuple of zeros. In fact, you can pass the
string to the constructor and it calls fromstring automatically. For
an array of 1 million elements, using a string to initialize is 18x
faster. :)

- Max


From steve at holdenweb.com  Thu Feb 19 20:52:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:52:59 -0500
Subject: Newby Question for reading a file
In-Reply-To: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
	<gnkceu$5i9$02$1@news.t-online.com>
	<cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
Message-ID: <499E0CFB.2090203@holdenweb.com>

alex23 wrote:
> On Feb 20, 5:38 am, Peter Otten <__pete... at web.de> wrote:
>> Yes you can get portions of the line by slicing:
>>
>> for line in open("infile"):
>>     if line[8:18] != line[18:28]:
>>             print line,
> 
> You can also name the slices, which makes the code more clear (IMO):
> 
> endda = slice(8,18)
> begda = slice(18,28)
> for line in open("infile"):
>     if line[endda] != line[begda]:
>             print line,
> 
>> Or you can use the struct module:
> 
> But this is the approach I'd take.

This is one of the lesser-appreciated aspects of Python. I anticipate a
flood of "Named Slices" blog posts round about now. Wonder if I'll be
the first?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 19 20:52:59 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 20:52:59 -0500
Subject: Newby Question for reading a file
In-Reply-To: <cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
References: <6b15ccff-7d39-42fc-b49e-35deb9098873@c12g2000yqj.googlegroups.com>	<3eafb3c3-01a2-423b-985a-1ca17f6e82b1@p13g2000yqc.googlegroups.com>
	<gnkceu$5i9$02$1@news.t-online.com>
	<cae9123e-9d9c-4890-835d-e05bc60e9186@s9g2000prg.googlegroups.com>
Message-ID: <499E0CFB.2090203@holdenweb.com>

alex23 wrote:
> On Feb 20, 5:38 am, Peter Otten <__pete... at web.de> wrote:
>> Yes you can get portions of the line by slicing:
>>
>> for line in open("infile"):
>>     if line[8:18] != line[18:28]:
>>             print line,
> 
> You can also name the slices, which makes the code more clear (IMO):
> 
> endda = slice(8,18)
> begda = slice(18,28)
> for line in open("infile"):
>     if line[endda] != line[begda]:
>             print line,
> 
>> Or you can use the struct module:
> 
> But this is the approach I'd take.

This is one of the lesser-appreciated aspects of Python. I anticipate a
flood of "Named Slices" blog posts round about now. Wonder if I'll be
the first?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mensanator at aol.com  Thu Feb 19 20:57:52 2009
From: mensanator at aol.com (Mensanator)
Date: Thu, 19 Feb 2009 17:57:52 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<mailman.312.1235092727.11746.python-list@python.org>
Message-ID: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>

On Feb 19, 7:18?pm, Steve Holden <st... at holdenweb.com> wrote:
> Mensanator wrote:
> > On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> [...]
> > When I run I Python program, the Windows task manager shows both
> > cores running (usually a 60/40 split) for an overall 50% usage.
>
> > What am I actually seeing? If Python only uses one of the cores,
> > why do both light up? Is everything much more complicated (due to
> > OS scheduling, etc.) than the simple explanations of GIL?
>
> You are seeing your Python program running on one core, and the usual
> Windows crap keeping the other one busy.

I thought of that, but the usual Windows crap accounts for only a
couple percent prior to the Python program running. Christian Heimes
answer sounds more realistic.

But what do I know?

>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/



From mkhitrov at gmail.com  Thu Feb 19 21:08:43 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:08:43 -0500
Subject: Strange array.array performance
In-Reply-To: <-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
Message-ID: <26ddd1750902191808x329881e2lde249be20571ab06@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:01 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com>
>> wrote:
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case....
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size). It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> In the meantime, you could write a function (to ease the shift to numpy)
> and reduce your interface problem to a very small set of lines:
>    def zeroes_d(n):
>        '''Allocate a n-element vector of 'd' elements'''
>        vector = array.array('d') # fromstring has no performance bug
>        vector.fromstring(n * 8 * '\0')
>        return vector
> Once numpy is up and running on 2.6, this should be easy to convert
> to a call to zeroes.

Here's the function that I'll be using from now on. It gives me
exactly the behavior I need, with an int initializer being treated as
array size. Still not as efficient as it could be if supported
natively by array (one malloc instead of two + memmove + extra
function call), but very good performance nevertheless:

from array import array as _array
array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in 'cbBuhHiIlLfd')

def array(typecode, init):
	if isinstance(init, int):
		return _array(typecode, array_null[typecode] * init)
	return _array(typecode, init)

- Max


From sjmachin at lexicon.net  Thu Feb 19 21:15:51 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 19 Feb 2009 18:15:51 -0800 (PST)
Subject: Strange array.array performance
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com> 
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
Message-ID: <91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>

On Feb 20, 6:53?am, Maxim Khitrov <mkhit... at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.k... at gmail.com> wrote:
> > On 2009-02-19 12:52, Maxim Khitrov wrote:
>
> >> Hello all,
>
> >> I'm currently writing a Python<-> ?MATLAB interface with ctypes and
> >> array.array class, using which I'll need to push large amounts of data
> >> to MATLAB.
>
> > Have you taken a look at mlabwrap?
>
> > ?http://mlabwrap.sourceforge.net/
>
> > At the very least, you will probably want to use numpy arrays instead of
> > array.array.
>
> > ?http://numpy.scipy.org/
>
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case. Mlabwrap description doesn't mention if
> it is thread-safe, and that's another one of my requirements.
>
> The only feature that I'm missing with array.array is the ability to
> quickly pre-allocate large chunks of memory. To do that right now I'm
> using array('d', (0,) * size).

It would go somewhat faster if you gave it a float instead of an int.

> It would be nice if array accepted an
> int as the second argument indicating how much memory to allocate and
> initialize to 0.

While you're waiting for that to happen, you'll have to use the
fromstring trick, or another gimmick that is faster and is likely not
to use an extra temp 8Mb for a 1M-element array, as I presume the
fromstring does.

[Python 2.6.1 on Windows XP SP3]
[Processor: x86 Family 15 Model 36 Stepping 2 AuthenticAMD ~1994 Mhz]

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d',(0,)*
1000000)"
10 loops, best of 3: 199 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d',(0.,)*1000000)"
10 loops, best of 3: 158 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d');x.fromstring('\0'*8*1000000)"
10 loops, best of 3: 36 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
('d','\0'*8*1000000)"
10 loops, best of 3: 35.7 msec per loop

C:\junk>\python26\python -mtimeit -s"from array import array" "array
('d',(0.,))*1000000"
10 loops, best of 3: 19.5 msec per loop

HTH,
John


From lists at cheimes.de  Thu Feb 19 21:19:15 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 03:19:15 +0100
Subject: Will multithreading make python less popular?
In-Reply-To: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>	<mailman.312.1235092727.11746.python-list@python.org>
	<0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
Message-ID: <gnl3v4$4nd$1@ger.gmane.org>

Mensanator wrote:
> I thought of that, but the usual Windows crap accounts for only a
> couple percent prior to the Python program running. Christian Heimes
> answer sounds more realistic.
> 
> But what do I know?

Be happy that your program makes use of both cores? :]

You can restrict your program from using more than one core by setting
the cpu affinity. On Windows the pywin32 packages wraps all necessary calls:


phandle = win32process.GetCurrentProcess()
win32process.SetProcessAffinityMask(phandle, mask)


Past week I've written a wrapper for the Linux syscalls
sched_setaffinity and friends. I may be able and allowed to release the
stuff in a few weeks.

Christian



From cournape at gmail.com  Thu Feb 19 21:34:48 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 20 Feb 2009 11:34:48 +0900
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
Message-ID: <5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:53 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
>> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>>
>>> Hello all,
>>>
>>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>>> array.array class, using which I'll need to push large amounts of data
>>> to MATLAB.
>>
>> Have you taken a look at mlabwrap?
>>
>>  http://mlabwrap.sourceforge.net/
>>
>> At the very least, you will probably want to use numpy arrays instead of
>> array.array.
>>
>>  http://numpy.scipy.org/
>
> I have, but numpy is not currently available for python 2.6, which is
> what I need for some other features, and I'm trying to keep the
> dependencies down in any case. Mlabwrap description doesn't mention if
> it is thread-safe, and that's another one of my requirements.

What do you mean by thread-safe ? Different threads calling the same
matlab engine handle ?

David


From steve at holdenweb.com  Thu Feb 19 21:36:07 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 19 Feb 2009 21:36:07 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>	<mailman.312.1235092727.11746.python-list@python.org>
	<0e6659fa-348b-4f76-b6fb-b18af08a6ab6@w24g2000prd.googlegroups.com>
Message-ID: <gnl4uo$6aq$1@ger.gmane.org>

Mensanator wrote:
> On Feb 19, 7:18 pm, Steve Holden <st... at holdenweb.com> wrote:
>> Mensanator wrote:
>>> On Feb 19, 2:18 pm, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
>> [...]
>>> When I run I Python program, the Windows task manager shows both
>>> cores running (usually a 60/40 split) for an overall 50% usage.
>>> What am I actually seeing? If Python only uses one of the cores,
>>> why do both light up? Is everything much more complicated (due to
>>> OS scheduling, etc.) than the simple explanations of GIL?
>> You are seeing your Python program running on one core, and the usual
>> Windows crap keeping the other one busy.
> 
> I thought of that, but the usual Windows crap accounts for only a
> couple percent prior to the Python program running. Christian Heimes
> answer sounds more realistic.
> 
> But what do I know?
> 
At least as much as I do, probably.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From hellyj at ucsd.edu  Thu Feb 19 21:38:07 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 18:38:07 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-CE2288.11164519022009@ger.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
Message-ID: <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>

Hi.

You are correct about finding the module, Ned.  Thanks for that  
although I don't understand why it works.  However, there are  
complications.

1. Using '/usr/bin/python' and 'from osgeo import gdal' works but  
throws an error the first time it's invoked.

NeptuneDesk.local:/Volumes/B2_160GB/PALSAR_200902/Geotiffs>/usr/bin/ 
python
Python 2.5.1 (r251:54863, Apr 15 2008, 22:57:26)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> from osgeo import gdal
Python(21061) malloc: *** error for object 0xa00696d8: Non-aligned  
pointer being freed
*** set a breakpoint in malloc_error_break to debug
 >>> from osgeo import gdal
 >>>

2. Since I'm trying to use gdal_merge.py this causes a second attempt  
within gdal_merge.py, after the error above, to be made with the old  
(now wrong) syntax:

try:
     from osgeo import gdal
except ImportError:
     osgeo import gdal

3.  I changed the gdal_merge.py code so it uses the correct syntax  
even after the error but then find that I get the original 'no module'  
error, I think, because gdal_merge.py starts with the line:

#!/usr/bin/env python

I don't understand this usage but when I run it alone (i.e., /usr/bin/ 
env) I see that it forces the PATH, and the environment in general, to  
be something different than what I have set in my .bash_profile.  For  
example, it puts

PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:

in the beginning in front of /usr/bin which I had moved up in the path  
in my .bash_profile.  I overcame this by getting rid of /usr/bin/env  
and substituting /usr/bin/python.

So, there are three issues:

1. the malloc error
2. the interaction with the gdal_merge.py error handling
3. the environment setup and where that's coming from.

Otherwise, everything's peachy.

Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center,  Mail Code 0527
Scripps Institution of Oceanography, Climate, Atmospheric Science, and  
Physical Oceanography, Mail Code 0224
9500 Gilman Dr., La Jolla CA 92093
+01 760 840 8660 mobile / stonesteps (Skype) / stonesteps7 (iChat) /  
URL (http://www.sdsc.edu/~hellyj)

On Feb 19, 2009, at 11:16 AM, Ned Deily wrote:

In article <nad-D1A1B2.10514619022009 at ger.gmane.org>,
Ned Deily <nad at acm.org> wrote:
> It looks like you have installed GDAL to the site-packages directory  
> of
> the Apple-supplied python 2.5 (which, for 10.5, is 2.5.1, not 2.4).
> That site-packages directory is /Library/Python/2.5. The Apple- 
> supplied
> python comes with a sym link from /usr/bin/python.  If you launch it,
> you'll probably find GDAL is there as expected.
>
> If you do want to use the python.org python, which is somewhat newer,
> you need to install its own version of setuptools/easy_install and use
> it to install GDAL to the site-packages directory of that python which
> is located here:
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site- 
> pack
> ages.  The two python instances co-exist.  To install another
  easy_install, ensure the python.org python comes first on your
> PATH, then follow the instructions here:
>   <http://pypi.python.org/pypi/setuptools>

BTW, that easy_install will itself be installed into the bin directory
of the python.org python framework.  So to ensure you are using that
easy_install and that python, make sure that bin directory is on your
PATH before "/usr/bin", so, if necessary, something like:

export PATH="/Library/Frameworks/Python.framework/Versions/2.5/bin: 
$PATH"

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list

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From mkhitrov at gmail.com  Thu Feb 19 21:43:08 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:43:08 -0500
Subject: Strange array.array performance
In-Reply-To: <5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
Message-ID: <26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>

On Thu, Feb 19, 2009 at 9:34 PM, David Cournapeau <cournape at gmail.com> wrote:
> On Fri, Feb 20, 2009 at 4:53 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.kern at gmail.com> wrote:
>>> On 2009-02-19 12:52, Maxim Khitrov wrote:
>>>>
>>>> Hello all,
>>>>
>>>> I'm currently writing a Python<->  MATLAB interface with ctypes and
>>>> array.array class, using which I'll need to push large amounts of data
>>>> to MATLAB.
>>>
>>> Have you taken a look at mlabwrap?
>>>
>>>  http://mlabwrap.sourceforge.net/
>>>
>>> At the very least, you will probably want to use numpy arrays instead of
>>> array.array.
>>>
>>>  http://numpy.scipy.org/
>>
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case. Mlabwrap description doesn't mention if
>> it is thread-safe, and that's another one of my requirements.
>
> What do you mean by thread-safe ? Different threads calling the same
> matlab engine handle ?

Yes, I may have a case where one thread is still sending data, while
another tries to close the connection, or two threads trying to close
the connection at the same time. In both cases, I need some parts of
the code to be atomic to prevent errors.

- Max


From johnforse at talktalk.net  Thu Feb 19 21:46:19 2009
From: johnforse at talktalk.net (John Forse)
Date: Fri, 20 Feb 2009 02:46:19 +0000
Subject: IDLE error on 3.0.1
Message-ID: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>

Occaisionally, if I mistype in python shell or try to copy & paste a  
line there, I get a permanent hang with the error below. It isn't  
corrected by quitting IDLE, but is put right with a restart.  I am  
running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
the same system with 2.5 &2.6.1 ?
Is there another way to prevent this?
Regards
John Forse

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From benjamin.kaplan at case.edu  Thu Feb 19 21:53:23 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Thu, 19 Feb 2009 21:53:23 -0500
Subject: Will multithreading make python less popular?
In-Reply-To: <7xbpsyj73b.fsf@ruckus.brouhaha.com>
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.308.1235087951.11746.python-list@python.org>
	<7xbpsyj73b.fsf@ruckus.brouhaha.com>
Message-ID: <ec96e1390902191853k617e69edt1636aca60bec1baa@mail.gmail.com>

On Thu, Feb 19, 2009 at 7:16 PM, Paul Rubin <http> wrote:

> Terry Reedy <tjreedy at udel.edu> writes:
> > > The slowness itself can be addressed by technical means, such as
> > > native-code compilation and eliminating the GIL.
> >
> > Given that the GIL remains to make Python run faster in the usual (up
> > to now, at least) case of 1 processor, that seems a strange statement.
>
> We've had this discussion before.  The 1-processor slowdown that you
> refer to comes from replacing the GIL with the blunt instrument of a
> lock around each reference count operation.  That has the advantage of
> not breaking CPython in a million places, but has the drawback of
> taking a big performance hit.  The long term fix is to replace
> reference counts with a tracing GC.  That is apparently not feasible
> in the framework of CPython and the many extension modules that have
> been written for it, so it would have to be accompanied by an
> implementation switch (e.g. PyPy).
>
> Steve Holden has mentioned Jython and Ironpython a few times in this
> thread.  Those are reasonable proofs of the concept of a GIL-less
> Python, but for various reasons (spelled J-V-M and W-i-n-d-o-w-s) are
> not all that suitable for many current Python users.


Actually, Mono supports IronPython so it will work on M-a-c, L-i-n-u-x,
S-o-l-a-r-i-s, and possibly even W-i-i and P-l-a-y-s-t-a-t-i-o-n-3.




> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rNOSPAMon at flownet.com  Thu Feb 19 21:57:13 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Thu, 19 Feb 2009 18:57:13 -0800
Subject: To unicode or not to unicode
Message-ID: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>

I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
mu at the beginning (it's pronounced micro-wiki).  It's working, except 
that I can't actually enter the name of the wiki into the wiki itself 
because the default unicode encoding on my Python installation is 
"ascii".  So I'm trying to decide on a course of action.  There seem to 
be three possibilities:

1.  Change the code to properly support unicode.  Preliminary 
investigations indicate that this is going to be a colossal pain in the 
ass.

2.  Change the default encoding on my Python installation to be latin-1 
or UTF8.  The disadvantage to this is that no one else will be able to 
run my code without making the same change to their installation, since 
you can't change default encodings once Python has started.

3.  Punt and spell it 'uwiki' instead.

I'm feeling indecisive so I thought I'd ask other people's opinion.  
What should I do?

rg


From mkhitrov at gmail.com  Thu Feb 19 21:58:42 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 21:58:42 -0500
Subject: Strange array.array performance
In-Reply-To: <91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<91af5ae1-bb76-405a-af28-f65ead4e847f@i18g2000prf.googlegroups.com>
Message-ID: <26ddd1750902191858p2b84cedeicbaebbe29cc9af42@mail.gmail.com>

On Thu, Feb 19, 2009 at 9:15 PM, John Machin <sjmachin at lexicon.net> wrote:
> On Feb 20, 6:53 am, Maxim Khitrov <mkhit... at gmail.com> wrote:
>> On Thu, Feb 19, 2009 at 2:35 PM, Robert Kern <robert.k... at gmail.com> wrote:
>> > On 2009-02-19 12:52, Maxim Khitrov wrote:
>>
>> >> Hello all,
>>
>> >> I'm currently writing a Python<->  MATLAB interface with ctypes and
>> >> array.array class, using which I'll need to push large amounts of data
>> >> to MATLAB.
>>
>> > Have you taken a look at mlabwrap?
>>
>> >  http://mlabwrap.sourceforge.net/
>>
>> > At the very least, you will probably want to use numpy arrays instead of
>> > array.array.
>>
>> >  http://numpy.scipy.org/
>>
>> I have, but numpy is not currently available for python 2.6, which is
>> what I need for some other features, and I'm trying to keep the
>> dependencies down in any case. Mlabwrap description doesn't mention if
>> it is thread-safe, and that's another one of my requirements.
>>
>> The only feature that I'm missing with array.array is the ability to
>> quickly pre-allocate large chunks of memory. To do that right now I'm
>> using array('d', (0,) * size).
>
> It would go somewhat faster if you gave it a float instead of an int.
>
>> It would be nice if array accepted an
>> int as the second argument indicating how much memory to allocate and
>> initialize to 0.
>
> While you're waiting for that to happen, you'll have to use the
> fromstring trick, or another gimmick that is faster and is likely not
> to use an extra temp 8Mb for a 1M-element array, as I presume the
> fromstring does.
>
> [Python 2.6.1 on Windows XP SP3]
> [Processor: x86 Family 15 Model 36 Stepping 2 AuthenticAMD ~1994 Mhz]
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d',(0,)*
> 1000000)"
> 10 loops, best of 3: 199 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d',(0.,)*1000000)"
> 10 loops, best of 3: 158 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d');x.fromstring('\0'*8*1000000)"
> 10 loops, best of 3: 36 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "x=array
> ('d','\0'*8*1000000)"
> 10 loops, best of 3: 35.7 msec per loop
>
> C:\junk>\python26\python -mtimeit -s"from array import array" "array
> ('d',(0.,))*1000000"
> 10 loops, best of 3: 19.5 msec per loop

Interesting, though I'm not able to replicate that last outcome. The
string method is still the fastest on my machine. Furthermore, it
looks like the order in which you do the multiplication also matters -
(8 * size * '\0') is faster than ('\0' * 8 * size). Here is my test
and outcome:

---
from array import array
from timeit import repeat

print repeat(lambda: array('d', (0,) * 100000), number = 100)
print repeat(lambda: array('d', (0.0,) * 100000), number = 100)
print repeat(lambda: array('d', (0.0,)) * 100000, number = 100)
print repeat(lambda: array('d', '\0' * 100000 * 8), number = 100)
print repeat(lambda: array('d', '\0' * 8 * 100000), number = 100)
print repeat(lambda: array('d', 8 * 100000 * '\0'), number = 100)
---

[0.91048107424534941, 0.88766983642377162, 0.88312824645684618]
[0.72164595848486179, 0.72038338197219343, 0.72346024633711981]
[0.10763947529894136, 0.1047547164728595, 0.10461521722863232]
[0.05856873793382178, 0.058508825334111947, 0.058361838698573365]
[0.057632016342657799, 0.057521392119007864, 0.057227118035289237]
[0.056006643320014149, 0.056331811311153501, 0.056187433215103333]

The array('d', (0.0,)) * 100000 method is a good compromise between
performance and amount of memory used, so maybe I'll use that instead.

- Max


From johnforse at talktalk.net  Thu Feb 19 22:00:01 2009
From: johnforse at talktalk.net (John Forse)
Date: Fri, 20 Feb 2009 03:00:01 +0000
Subject: Fwd: IDLE error on 3.0.1
References: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>
Message-ID: <3F795AB3-9BA5-4833-971C-9A442CEF7D7F@talktalk.net>


Regards
John



Begin forwarded message:

> From: John Forse <johnforse at talktalk.net>
> Date: 20 February 2009 02:46:19 GMT
> To: python-list at python.org
> Subject: IDLE error on 3.0.1
>
> Occaisionally, if I mistype in python shell or try to copy & paste a  
> line there, I get a permanent hang with the error below. It isn't  
> corrected by quitting IDLE, but is put right with a restart.  I am  
> running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
> the same system with 2.5 &2.6.1 ?
> Is there another way to prevent this?
> Regards
> John Forse
>
> IDLE cant bind TCP/IP port 8833 which is necessary to communicate  
> with it's python execution server. Either no networking is installed  
> on this computer or another process(another IDLE?) is using the  
> port. Run IDLE with the -n command line switch to start without a  
> sub-process and refer to help/IDLE Help 'Running without a sub- 
> process' for further details
>
PS I AM connected to the network at the time and Help/Idle help is  
greyed-out on my IDLE. I've tried entering -n to IDLE on the initial  
blank window, but it seems to make no difference to the problem. I  
don't understand what is happening.
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From nad at acm.org  Thu Feb 19 22:02:41 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 19:02:41 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
	<2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>
Message-ID: <nad-292E32.19024119022009@news.gmane.org>

In article <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269 at ucsd.edu>,
 "Helly John J." <hellyj at ucsd.edu> wrote:
>[...]
> 3.  I changed the gdal_merge.py code so it uses the correct syntax  
> even after the error but then find that I get the original 'no module'  
> error, I think, because gdal_merge.py starts with the line:
> 
> #!/usr/bin/env python
> 
> I don't understand this usage but when I run it alone (i.e., /usr/bin/ 
> env) I see that it forces the PATH, and the environment in general, to  
> be something different than what I have set in my .bash_profile.  For  
> example, it puts
> 
> PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:
> 
> in the beginning in front of /usr/bin which I had moved up in the path  
> in my .bash_profile.  I overcame this by getting rid of /usr/bin/env  
> and substituting /usr/bin/python.

See <http://en.wikipedia.org/wiki/Shebang_(Unix)>.

The idea behind /usr/bin/env usage is to allow scripts to get around 
absolute paths and to be able to find the interpreter for the script by 
using the search order of $PATH.  So, if the script with /usr/bin/env 
python was invoking the wrong python, it sounds like your $PATH wasn't 
really what you thought it was, despite changing your .bash_profile.  
Did you start a new terminal session or login shell?  What does "echo 
$PATH" say?

> So, there are three issues:
> 
> 1. the malloc error
> 2. the interaction with the gdal_merge.py error handling

No suggestions on the first two, other than to perhaps install 
easy_install and GDAL and friends using the python.org 2.5 and/or to ask 
in a more specialized forum.

> Otherwise, everything's peachy.

Good luck!

-- 
 Ned Deily,
 nad at acm.org



From cournape at gmail.com  Thu Feb 19 22:06:13 2009
From: cournape at gmail.com (David Cournapeau)
Date: Fri, 20 Feb 2009 12:06:13 +0900
Subject: Strange array.array performance
In-Reply-To: <26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
	<26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
Message-ID: <5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>

On Fri, Feb 20, 2009 at 11:43 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>
> Yes, I may have a case where one thread is still sending data, while
> another tries to close the connection, or two threads trying to close
> the connection at the same time. In both cases, I need some parts of
> the code to be atomic to prevent errors.

That does not sound like the right approach, then. Matlab engine is
not thread safe in that sense:

http://www.mathworks.fr/support/solutions/data/1-YR98I.html?product=ML&solution=1-YR98I

cheers,

David


From hellyj at ucsd.edu  Thu Feb 19 22:07:57 2009
From: hellyj at ucsd.edu (Helly John J.)
Date: Thu, 19 Feb 2009 19:07:57 -0800
Subject: Problems with OS X 10.5.6 and Python 2.5 and GDAL 1.6
In-Reply-To: <nad-292E32.19024119022009@news.gmane.org>
References: <60437775-ED63-469B-A2CC-913B0E77BC1E@ucsd.edu>
	<3A6157F5-DBA7-46B5-89A8-621DF6AB1F56@semanchuk.com>
	<F71B1E4C-87A5-41DD-AA9A-92687223F0DB@ucsd.edu>
	<nad-D1A1B2.10514619022009@ger.gmane.org>
	<nad-CE2288.11164519022009@ger.gmane.org>
	<2FE1A73A-5BDD-45CD-8323-CCDF68DF3269@ucsd.edu>
	<nad-292E32.19024119022009@news.gmane.org>
Message-ID: <EC651CC6-2906-483D-A77A-BB6B28BE999C@ucsd.edu>

Thanks, Ned. Despite the problems, your help has given me something to  
work with.
Cheers.
--------------
John Helly, University of California, San Diego
San Diego Supercomputer Center
Scripps Institution of Oceanography 9500 Gilman Dr. Mail Code, La  
Jolla CA 92093
Phone: Voice +01 760 840 8660 mobile / stonesteps (Skype) /  
stonesteps7 (iChat)
http://www.sdsc.edu/~hellyj



On Feb 19, 2009, at 7:02 PM, Ned Deily wrote:

In article <2FE1A73A-5BDD-45CD-8323-CCDF68DF3269 at ucsd.edu>,
"Helly John J." <hellyj at ucsd.edu> wrote:
> [...]
> 3.  I changed the gdal_merge.py code so it uses the correct syntax
> even after the error but then find that I get the original 'no module'
> error, I think, because gdal_merge.py starts with the line:
>
> #!/usr/bin/env python
>
> I don't understand this usage but when I run it alone (i.e., /usr/bin/
> env) I see that it forces the PATH, and the environment in general, to
> be something different than what I have set in my .bash_profile.  For
> example, it puts
>
> PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:
>
> in the beginning in front of /usr/bin which I had moved up in the path
> in my .bash_profile.  I overcame this by getting rid of /usr/bin/env
> and substituting /usr/bin/python.

See <http://en.wikipedia.org/wiki/Shebang_(Unix)>.

The idea behind /usr/bin/env usage is to allow scripts to get around
absolute paths and to be able to find the interpreter for the script by
using the search order of $PATH.  So, if the script with /usr/bin/env
python was invoking the wrong python, it sounds like your $PATH wasn't
really what you thought it was, despite changing your .bash_profile.
Did you start a new terminal session or login shell?  What does "echo
$PATH" say?

> So, there are three issues:
>
> 1. the malloc error
> 2. the interaction with the gdal_merge.py error handling

No suggestions on the first two, other than to perhaps install
easy_install and GDAL and friends using the python.org 2.5 and/or to ask
in a more specialized forum.

> Otherwise, everything's peachy.

Good luck!

-- 
Ned Deily,
nad at acm.org

--
http://mail.python.org/mailman/listinfo/python-list



From nad at acm.org  Thu Feb 19 22:18:18 2009
From: nad at acm.org (Ned Deily)
Date: Thu, 19 Feb 2009 19:18:18 -0800
Subject: Fwd: IDLE error on 3.0.1
References: <1C3FA0D1-D744-47AD-B9C5-684C1D045BE3@talktalk.net>
	<3F795AB3-9BA5-4833-971C-9A442CEF7D7F@talktalk.net>
Message-ID: <nad-FF7C50.19181819022009@news.gmane.org>

In article <3F795AB3-9BA5-4833-971C-9A442CEF7D7F at talktalk.net>,
 John Forse <johnforse at talktalk.net> wrote:
> > Occaisionally, if I mistype in python shell or try to copy & paste a  
> > line there, I get a permanent hang with the error below. It isn't  
> > corrected by quitting IDLE, but is put right with a restart.  I am  
> > running 3.0.1 on Mac 10.5.6. Is this a bug, as it never happened on  
> > the same system with 2.5 &2.6.1 ?
> > Is there another way to prevent this?
> > Regards
> > John Forse
> >
> > IDLE cant bind TCP/IP port 8833 which is necessary to communicate  
> > with it's python execution server. Either no networking is installed  
> > on this computer or another process(another IDLE?) is using the  
> > port. Run IDLE with the -n command line switch to start without a  
> > sub-process and refer to help/IDLE Help 'Running without a sub- 
> > process' for further details
> >
> PS I AM connected to the network at the time and Help/Idle help is  
> greyed-out on my IDLE. I've tried entering -n to IDLE on the initial  
> blank window, but it seems to make no difference to the problem. I  
> don't understand what is 
> happening.--------------------------------------------------------------------

The error message means that there is another IDLE still running so I 
assume you get this when you try to launch IDLE again after the first 
one hangs?  If the first IDLE is hung, there should be either an IDLE or 
Python icon in your dock and, if IDLE is not responding to menu items or 
type-ins, you should be able to cause it to quit by pressing Option 
while clicking on the icon in the dock and selecting Force Quit.

It would be very helpful if you could outline the steps to reproduce 
this (in particular, how you launch IDLE) and open an issue on the 
Python bug tracker: http://bugs.python.org/

-- 
 Ned Deily,
 nad at acm.org



From benjamin at python.org  Thu Feb 19 22:21:57 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 20 Feb 2009 03:21:57 +0000 (UTC)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <loom.20090220T031801-918@post.gmane.org>

Ron Garret <rNOSPAMon <at> flownet.com> writes:

> 
> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
> mu at the beginning (it's pronounced micro-wiki).  It's working, except 
> that I can't actually enter the name of the wiki into the wiki itself 
> because the default unicode encoding on my Python installation is 
> "ascii".  So I'm trying to decide on a course of action.  There seem to 
> be three possibilities:

You should never have to rely on the default encoding. You should explicitly
decode and encode data.

> 
> 1.  Change the code to properly support unicode.  Preliminary 
> investigations indicate that this is going to be a colossal pain in the 
> ass.

Properly handling unicode may be painful at first, but it will surely pay off in
the future.






From mkhitrov at gmail.com  Thu Feb 19 22:31:05 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 19 Feb 2009 22:31:05 -0500
Subject: Strange array.array performance
In-Reply-To: <5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<26ddd1750902191153lb1b5efaj783f1c75596d900c@mail.gmail.com>
	<5b8d13220902191834v3c6224baoa810a87650cad464@mail.gmail.com>
	<26ddd1750902191843j76e2df31nfb56ac18fe023c52@mail.gmail.com>
	<5b8d13220902191906g328084e7j4e4f2067e8d7f92@mail.gmail.com>
Message-ID: <26ddd1750902191931t148724bchc9fdb2d583f170f1@mail.gmail.com>

On Thu, Feb 19, 2009 at 10:06 PM, David Cournapeau <cournape at gmail.com> wrote:
> On Fri, Feb 20, 2009 at 11:43 AM, Maxim Khitrov <mkhitrov at gmail.com> wrote:
>>
>> Yes, I may have a case where one thread is still sending data, while
>> another tries to close the connection, or two threads trying to close
>> the connection at the same time. In both cases, I need some parts of
>> the code to be atomic to prevent errors.
>
> That does not sound like the right approach, then. Matlab engine is
> not thread safe in that sense:
>
> http://www.mathworks.fr/support/solutions/data/1-YR98I.html?product=ML&solution=1-YR98I
>
> cheers,
>
> David
>

"One option is to use MUTEXes around every call into the MATLAB
Engine" - that's exactly what I'm doing. Some setup work, like
creating mxArrays is done without a lock, but all eng* calls are
mutually exclusive. I've been doing a lot of my own testing, and so
far have seen no problems with this approach.

- Max


From dean.wheatley at gmail.com  Thu Feb 19 22:34:32 2009
From: dean.wheatley at gmail.com (dean.wheatley at gmail.com)
Date: Thu, 19 Feb 2009 19:34:32 -0800 (PST)
Subject: Matplotlib change xticks and retain xticks changing during zoom
Message-ID: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>

Hello,

I execute the following code:

try:
	from math import *
	import pylab as p
except:
	print "Couldn't import all dependent libraries"
	sys.exit()
dataLength = 100
data = [sin(2*pi*x/dataLength) for x in range(0,dataLength)]
p.plot(data)
p.show()


This produces a figure window. When I zoom in regions of the plot, the
xticks change correctly to the zoomed region.

This is in contrast to the effect of the following code:

try:
	from math import *
	import pylab as p
except:
	print "Couldn't import all dependent libraries"
	sys.exit()
dataLength = 100
data = [sin(2*pi*x/dataLength) for x in range(0,dataLength)]
p.plot(data)
newXTicks= [str(x/2.0) for x in p.xticks()[0]]
p.xticks(p.xticks()[0], newXTicks)
p.show()

This code produces tick marks [0, 10, 20, 30, 40, 50]. However when
zooming, the xtick marks do not adjust correctly to the zoomed
regions.


Your help on this issue would be great, thanks!


From timr at probo.com  Thu Feb 19 22:35:36 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 19 Feb 2009 19:35:36 -0800
Subject: Will multithreading make python less popular?
References: <mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <b69sp4pf68nil053ivcs52gq5g23v36g54@4ax.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> wrote:
>
>C is basically never appropriate.  C should be outlawed by Congress
>with the ban enforced by roving pie-throwing squads <wink>.

One of my favorite quotes:

   The last good thing written in C was Schubert's Ninth Symphony.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From notvalid2 at sbcglobal.net  Thu Feb 19 23:03:56 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 20:03:56 -0800
Subject: Which Version of wxPython for Win XP
In-Reply-To: <d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
	<b2993e93-61c0-4a25-8a5f-c62ffc05c946@g38g2000yqd.googlegroups.com>
	<0Vfnl.5624$%54.4038@nlpi070.nbdc.sbc.com>
	<Lzgnl.13238$D32.5086@flpi146.ffdc.sbc.com>
	<d0d986dd-4025-46cb-879a-d79d27f1eb8a@z1g2000yqn.googlegroups.com>
Message-ID: <XXpnl.14205$as4.8059@nlpi069.nbdc.sbc.com>

Mike Driscoll wrote:
> On Feb 19, 11:29 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> W. eWatson wrote:
>>> Eric_Dex... at msn.com wrote:
>>>> On Feb 19, 8:22 am, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>>>> I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi
>>>>> version is the choice for me. The other choice has unicode. Do I care?
>>>>> --
>>>>>                                 W. eWatson
>>>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>>>                      Web Page: <www.speckledwithstars.net/>
>>>> There is a good chance you don't care...  I think the other is for
>>>> internationalization...  best to look..  It would be easier to answer
>>>> the question if you said what you are going to do with it, and who
>>>> needed to use your software.  It's even possible that you might want
>>>> to try pygame depending on what you want to use it for and who the
>>>> audience is (and how good thier computers are)
>>>> http://pypi.python.org/simple/Dex%20Tracker/
>>> Thanks. I think I'll take the chance. Somewhat simple programming.
>>> Off I go to install it. It can always be un-installed.
>> Well, that was an interesting experience. It appears to have recompiled a
>> lot of stuff, and probably some libraries. IDLE is still with me as the way
>> to open py files. Apparently, if I want to get around IDLE, I may have to
>> install some other editor.
>>
>> --
>>                                 W. eWatson
>>
> 
> The compiling you are referring to is just making the py files into
> pyc files. This is normal and is a speed improvement. In fact, a lot
> of the scripts you write will create a pyc file when first run.
> 
> In other words, wxPython does not affect your Python install in any
> way other than making itself available as a 3rd party package (i.e.
> adding itself to the path), just like any other good 3rd party
> package. I'm not sure why you're even talking about IDLE...wxPython is
> a GUI toolkit, not an IDE.
> 
> Mike
Thanks. Yes, I finally discovered that the need here was not what I wanted 
afterall. Un-installed now.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From notvalid2 at sbcglobal.net  Thu Feb 19 23:06:42 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Thu, 19 Feb 2009 20:06:42 -0800
Subject: Keeping the Console Open with IDLE
Message-ID: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>

I'm using IDLE for editing, but execute programs directly. If there are 
execution or "compile" errors, the console closes before I can see what it 
contains. How do I prevent that?
-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From jitu.icfai at gmail.com  Thu Feb 19 23:58:24 2009
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Fri, 20 Feb 2009 10:28:24 +0530
Subject: email varification using smtplib or any method
Message-ID: <ad2372b70902192058re1bd1abic5654b60ba6c3590@mail.gmail.com>

hello
here is my code for sending the mail, using this code email is going
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''    CODE
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
import smtplib
from time import strftime
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.Utils import COMMASPACE, formatdate


# Create message container - the correct MIME type is multipart/alternative.
msg = MIMEMultipart('alternative')
msg['Subject'] = " is sending the mail"
msg['From'] = 'jitu.icfai at myprivatedomain.com <jitu.icfai at domain.com>'
msg['Date'] = formatdate(localtime=True)
msg['To'] = 'jitu.icfai at gmail.com'

# Create the body of the message (a plain-text and an HTML version).
#text = "jitendra kya huy a!\nHow are you?\nHere is the link you
wanted:\nhttp://www.python.org"
html = """\
<html>
  <head></head>
  <body>
    <p>Hi!<br>
       How are you?<br>
       This mail is send by wjitenrda
       Here is the <a href="http://www.python.org">link</a> you wanted.
    </p>
  </body>
</html>
"""

part2 = MIMEText(html, 'html')


msg.attach(part2)

# Send the message via local SMTP server.
s = smtplib.SMTP('smtp.myprivatedomain.com <http://name.com>')
s.login("user","password")
s.sendmail(msg['From'], msg['To'], msg.as_string())
s.close()
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''    CODE  END
 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
using this code i am able to send the email , but problem is
when i am changing
msg['To'] = "wronguser at wrongdomain.comddsdjsdsdsjdh"
some wrong email then i am getting back failure notice in my inbox, which i
dont want..
is there any way so that i can identify wrong email during the run time
(when i am sending  the email)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090220/fc73d6c3/attachment-0001.html>

From michele.simionato at gmail.com  Fri Feb 20 00:22:49 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 19 Feb 2009 21:22:49 -0800 (PST)
Subject: "metaclass conflict" error: where is noconflict ?
References: <mailman.36.1235041220.11040.python-list@python.org> 
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com> 
	<mailman.289.1235077114.11746.python-list@python.org>
Message-ID: <ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>

On Feb 19, 9:58?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Ba... at lsi.com> wrote:
> > Hi,
>
> > I have a class derived from two parents (in blue below), which gives me the
> > following error:
>
> > $ python -u ./failover_pickle_demo09.py
> > Traceback (most recent call last):
> > ? File "./failover_pickle_demo09.py", line 291, in <module>
> > ? ? class ListControl(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> > ? ? metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases
> > Googling suggested I should add
> > from noconflict import classmaker
> > and
>
> > __metaclass__=classmaker()
> > to this class.
>
> > However, I don't seem able to find where to get the noconflict module from.
>
> > Do any of you where noconflict ?could be downloaded/installed from ?


It refers to this cookbook recipe:
http://code.activestate.com/recipes/204197/

See also the printed cookbook:

http://books.google.it/books?id=1Shx_VXS6ioC&pg=PA786&lpg=PA786&dq=python+cookbook+noconflict&source=bl&ots=BB413AZ8R7&sig=cnAB-E9rNFolHBEZQTIm_d4Mj3o&hl=it&ei=GT2eSfCtBdWa_gadppHYCw&sa=X&oi=book_result&resnum=2&ct=result#PPA786,M1

However, there is no module to download, and this is on purpose:
instead of blindly apply a "fix" one should
understand what the conflict is: then it is quite easy to
solve it by hand. The recipe discussion explains it all.


From mccredie at gmail.com  Fri Feb 20 00:42:08 2009
From: mccredie at gmail.com (Matimus)
Date: Thu, 19 Feb 2009 21:42:08 -0800 (PST)
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
Message-ID: <54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>

On Feb 19, 8:06?pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
> I'm using IDLE for editing, but execute programs directly. If there are
> execution or "compile" errors, the console closes before I can see what it
> contains. How do I prevent that?
> --
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? W. eWatson
>
> ? ? ? ? ? ? ? (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> ? ? ? ? ? ? ? ?Obz Site: ?39? 15' 7" N, 121? 2' 32" W, 2700 feet
>
> ? ? ? ? ? ? ? ? ? ? ?Web Page: <www.speckledwithstars.net/>

Open a console window and type in the name of the script rather than
just double clicking on it. Or, you can terminate your script with a
'raw_input("press enter to quit")'.

Matt


From timr at probo.com  Fri Feb 20 01:37:10 2009
From: timr at probo.com (Tim Roberts)
Date: Thu, 19 Feb 2009 22:37:10 -0800
Subject: Which Version of wxPython for Win XP
References: <KVdnl.7433$jZ1.6998@flpi144.ffdc.sbc.com>
Message-ID: <ohjsp4tutkkncocmgd99of86dk5431c4u3@4ax.com>

"W. eWatson" <notvalid2 at sbcglobal.net> wrote:
>
>I'm going to try out wxPython 2.8.92 for py25. It seems like the ansi 
>version is the choice for me. The other choice has unicode. Do I care?

Well, there's a subtle point that gives me an opportunity to point out a
lesser-known "feature" of the NT-based systems (XP, Vista, etc).

The core Win32 APIs on the NT-based systems are all Unicode.  When you call
an ANSI API, the system converts all of your ANSI strings to Unicode, then
calls the Unicode API, then converts any output strings back to ANSI.

So, there is, actually, a (small) performance advantage in using the
Unicode APIs instead of the ANSI APIs.

Unless you need your wx programs to run on Windows 98, I recommend you use
the Unicode version of wxPython.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steve at pearwood.info  Fri Feb 20 01:57:07 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 17:57:07 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<e8237f30-d3cd-4f69-81df-fe9bb0adcb45@l39g2000yqn.googlegroups.com>
	<aee48b3c0902191437j1b0ca620hc6c0f3d93327c3d@mail.gmail.com>
	<mailman.300.1235084038.11746.python-list@python.org>
Message-ID: <01ae49c5$0$20662$c3e8da3@news.astraweb.com>

Steve Holden wrote:

>> It's only an error if it gets in the way. It's the experience of a lot
>> of programmers that it doesn't, so it's not an error.
>> 
> And it's not a feature of the language, rather of one or two
> implementations. Neither JPython not IronPython use a GIL to the best of
> my knowledge, so you are still quite at liberty to use them.

I found this interesting benchmark on the relative speeds of CPython 2.3,
IronPython 0.1 and Jython 2.1. It's from six years ago, so not exactly
reporting on the state of the art, but it suggests to me that IronPython is
faster at the fundamentals but much slower at some things.

http://www.python.org/~jeremy/weblog/031209a.html


-- 
Steven



From s.selvamsiva at gmail.com  Fri Feb 20 02:03:35 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Fri, 20 Feb 2009 12:33:35 +0530
Subject: Levenshtein word comparison -performance issue
In-Reply-To: <gn631q$l5b$02$1@news.t-online.com>
References: <b423b9550902130216p4f25a8eexfc0c5e26c4b416ce@mail.gmail.com>
	<mailman.9482.1234521740.3487.python-list@python.org>
	<gn631q$l5b$02$1@news.t-online.com>
Message-ID: <b423b9550902192303m1a508935u236e52549620aeaa@mail.gmail.com>

On Sat, Feb 14, 2009 at 3:01 PM, Peter Otten <__peter__ at web.de> wrote:

> Gabriel Genellina wrote:
>
> > En Fri, 13 Feb 2009 08:16:00 -0200, S.Selvam Siva <
> s.selvamsiva at gmail.com>
> > escribi?:
> >
> >> I need some help.
> >> I tried to find top n(eg. 5) similar words for a given word, from a
> >> dictionary of 50,000 words.
> >> I used python-levenshtein module,and sample code is as follow.
> >>
> >> def foo(searchword):
> >>     disdict={}
> >>     for word in self.dictionary-words:
> >>                    distance=Levenshtein.ratio(searchword,word)
> >>                    disdict[word]=distance
> >>     """
> >>      sort the disdict dictionary by values in descending order
> >>     """
> >>     similarwords=sorted(disdict, key=disdict.__getitem__, reverse=True)
> >>
> >>     return similarwords[:5]
> >
> > You may replace the last steps (sort + slice top 5) by heapq.nlargest -
> at
> > least you won't waste time sorting 49995 irrelevant words...
> > Anyway you should measure the time taken by the first part (Levenshtein),
> > it may be the most demanding. I think there is a C extension for this,
> > should be much faster than pure Python calculations.
> >
>
> [I didn't see the original post]
>
> You can use the distance instead of the ratio and put the words into bins
> of
> the same length. Then if you find enough words with a distance <= 1 in the
> bin with the same length as the search word you can stop looking.
>
> You might be able to generalize this approach to other properties that are
> fast to calculate and guarantee a minimum distance, e. g. set(word).
>
> Peter
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Thank you all for your response,

[sorry,I was away for a while.]
I used functools,heapq modules but that helped me a little,
then i categorized the words depending on the length and
compares with a small set(each set 50000/4=12,500),
so now its taking quarter of time as compared to older method.

Further, can i use Thread to achieve parallel comparison ?,as i have little
knowledge on python-thread.
Will the following code achive parallelism?

thread1= threading.Thread(target=self.findsimilar,
args=("1",searchword,dic-word-set1)
                   thread2= threading.Thread(target=self.findsimilar,
args=("2",searchword,dic-word-set1)
                   thread3= threading.Thread(target=self.findsimilar,
args=("3",searchword,dic-word-set1)
                   thread1.start()
                   thread2.start()
                   thread3.start()
                   thread1.join()
                   thread2.join()
                   thread3.join()

I would like to hear suggestion.
Note:The issue is i am developing spell checker for my local languge,i may
use more than 2.5 lakh words,so i need to have a best way to find out
alternative wordlist
-- 
Yours,
S.Selvam
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From steve at pearwood.info  Fri Feb 20 02:11:26 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:11:26 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
Message-ID: <01ae4d21$0$20647$c3e8da3@news.astraweb.com>

Paul Rubin wrote:

> How old is your computer, why did you buy it, and is it the first one
> you ever owned?
> 
> For most of us, I suspect, it is not our first one, and we bought it
> to get a processing speedup relative to the previous one. 

My computer is about eight months old, and I bought it because the previous
one died.


> If such 
> speedups were useless or unimportant, we would not have blown our hard
> earned cash replacing perfectly good older hardware, 

Oh the assumptions in that statement...

"Blowing hard-earned cash" assumes that people buy computers only when they
need to. That's certainly not true -- there's a lot of irrational purchases
involved. I have a friend who has just recently spent $2000 on storage so
he can store more games and videos, which he cheerfully admits he'll never
play or watch. He describes it as his "dragon's horde": it is for knowing
it's there, not for using.

Often hardware is upgraded because it's broken, or because you can't get
parts, or because the software you need will only run on newer machines. I
say *newer* rather than *faster*, because speed is only sometimes a factor
in why software won't run on old machines. My old Mac running a 68030 in
1990 ran Microsoft Word perfectly fast enough for even advanced word
processing needs, and nearly twenty years later, there's nothing I need
from a word processor that I couldn't do in 1990.


> so we have to 
> accept the concept that speed matters and ignore those platitudes that
> say otherwise.

The *perception* that speed matters, matters. The reality is that the
majority of computing tasks outside of certain specialist niches are I/O
bound, not CPU. Office server software is rarely CPU bound, and when it is,
in my experience there's one rogue process using all the CPU: the software
is broken, and a faster CPU would just let it be broken at a faster speed.

Gamers need better graphics cards and more memory, not faster CPUs. Internet
surfers need faster ethernet, more bandwidth and more memory, not faster
CPUs. Graphics designers need bigger hard drives and more memory, not
faster CPUs. (Hmm. There seems to be a pattern there...)

Of course, there are a few niches that do require faster CPUs: video
editing, some (but by no means all) Photoshop filters, number crunching,
etc. But even for them, you can often get more bang-for-your-buck
performance increase by adding more memory.

Speaking for myself, I'd happily take a 20% slower CPU for more reliable,
faster DVD/CD burning. What do I care if it takes my computer 120ms to open
a window instead of 100ms, but I care a lot if it takes me 10 minutes to
make a coaster instead of 7 minutes to make a good disc.



-- 
Steven



From steve at pearwood.info  Fri Feb 20 02:19:14 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:19:14 +1100
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<7x3aeadqlo.fsf@ruckus.brouhaha.com>	<mailman.298.1235082947.11746.python-list@python.org>
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
	<mailman.306.1235087140.11746.python-list@python.org>
Message-ID: <01ae4ef4$0$20660$c3e8da3@news.astraweb.com>

Steve Holden wrote:

> What Guido doesn't seem to have accepted yet is that slowing [C]Python
> down by 50% on a single-processor CPU will actually be a worthwhile
> tradeoff in ten years time, when nothing will have less than eight cores
> and the big boys will be running at 64 kilo-cores.

Ten years?

There's no guarantee that Python will still even be around in ten years. It
probably will be, I see no reason why it won't, but who knows? Maybe we'll
have mandatory software warranties tailored to suit the Microsofts and
Apples, and Guido and the PSF will be forced to abandon the language.

I think a design mistake would be to hamstring Python now for a hypothetical
benefit in a decade. But, well, in five years time, or three? Don't know.


-- 
Steven



From steve at pearwood.info  Fri Feb 20 02:19:45 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Fri, 20 Feb 2009 18:19:45 +1100
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<mailman.277.1235073073.11746.python-list@python.org>
Message-ID: <01ae4f13$0$20660$c3e8da3@news.astraweb.com>

andrew cooke wrote:

> 
> i wonder what fraction of people posting with "bug?" in their titles here
> actually find bugs?

About 99.99%.

Unfortunately, 99.98% have found bugs in their code, not in Python.


-- 
Steven



From clp2 at rebertia.com  Fri Feb 20 02:35:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 19 Feb 2009 23:35:50 -0800
Subject: CSV readers and UTF-8 files
In-Reply-To: <59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>
References: <mailman.252.1235053288.11746.python-list@python.org>
	<59de6aff-ed5f-40ca-8900-f8da908f7578@u39g2000prn.googlegroups.com>
Message-ID: <50697b2c0902192335w51f03c23vcedd12dbd1567dd0@mail.gmail.com>

On Thu, Feb 19, 2009 at 8:11 AM, Falcolas <garrickp at gmail.com> wrote:
> On Feb 19, 7:21 am, mk <mrk... at gmail.com> wrote:
>> Hello everyone,
>>
>> Is it just me or CSV reader/DictReader and UTF-8 files do not work
>> correctly in Python 2.6.1 (Windows)?
>
> I would point out in the CSV module documentation (http://
> docs.python.org/library/csv.html) it explicitly mentions that it can't
> handle unicode.
>
> You can use their workaround in the examples section for UTF-8, or
> with another form of encoding (I used MIME) for UTF-16.
>
> ~G

This really ought to be fixed for 3.0+ (seems to still be ASCII-only
according to the 3.0 docs...)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From mail at microcorp.co.za  Fri Feb 20 02:42:16 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 20 Feb 2009 09:42:16 +0200
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com><mailman.177.1234942519.11746.python-list@python.org><90d5e669-e8d1-441e-adff-ddc501d21d26@u13g2000yqg.googlegroups.com>
	<mailman.234.1235039030.11746.python-list@python.org>
	<bb4eef82-6132-416f-b3d4-3ed044541f63@v13g2000yqm.googlegroups.com>
Message-ID: <000e01c99332$bdc19c80$0d00a8c0@hendrik>

 "gert" <ger...ns at gmail.com>

> Hope you do not mind ignoring part of answers, so I can figure out
> more why things work the way they are.
> This two examples work, what i do not understand is that in function
> display i do not have to declare root, v or x ?
> 

x is easy - it was declared outside, in module scope, and you 
modified it after declaring it global.

The others are more subtle, and have to do with how the interpreter
searches for stuff  - first in the local scope, then up the stack in
the callers scope, up to finally in the module global scope.

That also explains why, if it is not found, you get an error message that
says "Global variable xxxxx not defined" (try it and see)

- Hendrik



From Scott.Daniels at Acm.Org  Fri Feb 20 02:42:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Thu, 19 Feb 2009 23:42:19 -0800
Subject: Strange array.array performance
In-Reply-To: <mailman.317.1235095727.11746.python-list@python.org>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>	<gnkcah$rqa$1@ger.gmane.org>	<mailman.278.1235073207.11746.python-list@python.org>	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
	<mailman.317.1235095727.11746.python-list@python.org>
Message-ID: <w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>

Maxim Khitrov wrote:
> ... Here's the function that I'll be using from now on. It gives me
> exactly the behavior I need, with an int initializer being treated as
> array size. Still not as efficient as it could be if supported
> natively by array (one malloc instead of two + memmove + extra
> function call), but very good performance nevertheless:
> 
> from array import array as _array
> array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in 'cbBuhHiIlLfd')
How about:
   array_null = dict((tc, _array(tc, (0,)).tostring() for tc in 
'cbBuhHiIlLfd')
...
(some ancient floating points did not use all-0 bytes for 0.0).

--Scott David Daniels
Scott.Daniels at Acm.Org


From robin at alldunn.com  Fri Feb 20 02:44:54 2009
From: robin at alldunn.com (Robin Dunn)
Date: Thu, 19 Feb 2009 23:44:54 -0800
Subject: ANN:  wxPython 2.8.9.2 release
Message-ID: <499E5F76.2080803@alldunn.com>

The wxWidgets team is in the early stages of preparing for a 2.8.10
release, but I already had a set of 2.8.9.2 release candidate files
that I made a few days ago.  Since it's still possible that there
could be delays in the 2.8.10 release I thought that it would be nice
to go ahead and release the 2.8.9.2 binaries.  So...


Announcing
----------

The 2.8.9.2 release of wxPython is now available for download at
http://wxpython.org/download.php.  This release adds the wx.lib.agw
package, adds an event watcher to the widget inspection tool, and
fixes a bunch of bugs.  A summary of changes is listed below and also
at http://wxpython.org/recentchanges.php.

Source code is available as a tarball and a source RPM, as well as
binaries for Python 2.4, 2.5 and 2.6[1], for Windows and Mac, as well
some packages for various Linux distributions.


[1] If installing the Python 2.6 version of wxPython on 64-bit XP or
Vista then please read the README presented by the installer for
instructions on how to enable the themed controls.  (If anybody has a
better solution for this please let Robin know.)



What is wxPython?
-----------------

wxPython is a GUI toolkit for the Python programming language. It
allows Python programmers to create programs with a robust, highly
functional graphical user interface, simply and easily. It is
implemented as a Python extension module that wraps the GUI components
of the popular wxWidgets cross platform library, which is written in
C++.

wxPython is a cross-platform toolkit. This means that the same program
will usually run on multiple platforms without modifications.
Currently supported platforms are 32-bit and 64-bit Microsoft Windows,
most Linux or other Unix-like systems using GTK2, and Mac OS X 10.4+.
In most cases the native widgets are used on each platform to provide
a 100% native look and feel for the application.



Changes in 2.8.9.2
------------------

Added the wx.lib.agw package, which contiains most of the widgets from
http://xoomer.alice.it/infinity77/main/freeware.html written by Andrea
Gavana.  Andrea's widgets that were already in wx.lib were also moved
to the wx.lib.agw package, with a small stub module left in wx.lib.
As part of this addition the demo framework was given the ability to
load demo modules from a sub-folder of the demo directory, to make it
easier to maintain collections of demo samples as a group.

Added the wx.PyPickerBase class which can be used to derive new picker
classes in Python.  Used it to implement a color picker for Mac that
uses a wx.BitmapButton instead of a normal wx.Button.  This makes the
color picker look and behave lots better on Mac than before.

You can now pass the handler function to the Unbind method.  If it is
given then Unbind will only disconenct the event handler that uses the
same handler function, so if there are multiple bindings for the same
event type you'll now be able to selectively unbind specific
instances.

Added a new tool to the Widget Inspection Tool that allows you to watch
the events passing through a widget.  It can also be used
independently, see wx.lib.eventwatcher.



-- 
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!



From mail at microcorp.co.za  Fri Feb 20 03:04:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Fri, 20 Feb 2009 10:04:39 +0200
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>	<mailman.241.1235048289.11746.python-list@python.org>	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>	<1235082919.21735.30.camel@tim-laptop><499DF0AC.2030306@mrabarnett.plus.com>
	<499DF688.2050303@holdenweb.com>
Message-ID: <000f01c99332$be58ac60$0d00a8c0@hendrik>

"Steve Holden" <ste... at ..web.com> wrote:

> <heresy>Perhaps it's time Python stopped being a dictatorship?</heresy>

This will need a wholesale switch to the worship of Freya - It is rumoured
that She is capable of herding cats.

- Hendrik



From bj_666 at gmx.net  Fri Feb 20 03:08:36 2009
From: bj_666 at gmx.net (Marc 'BlackJack' Rintsch)
Date: 20 Feb 2009 08:08:36 GMT
Subject: iterating through files
References: <mailman.293.1235080603.11746.python-list@python.org>
Message-ID: <7076o4Fn42niU1@mid.uni-berlin.de>

On Thu, 19 Feb 2009 13:56:38 -0800, oamram wrote:

> new to python. i have a directory with about 50 text file and i need to
> iterate through them and get
> line 7 to 11 from each file and write those lines into another file(one
> file that will contain all lines).

Untested:

from __future__ import with_statement
from glob import glob
from itertools import islice


def main():
    with open('result.txt', 'w') as out_file:
        for filename in glob('foo/*.txt'):
            with open(filename, 'r') as lines:
                out_file.writelines(islice(lines, 7, 12))


if __name__ == "__main__":
    main()


Ciao,
	Marc 'BlackJack' Rintsch


From astan.chee at al.com.au  Fri Feb 20 03:50:08 2009
From: astan.chee at al.com.au (Astan Chee)
Date: Fri, 20 Feb 2009 19:50:08 +1100
Subject: get most common number in a list with tolerance
Message-ID: <499E6EC0.8090509@al.com.au>

Hi,
I have a list that has a bunch of numbers in it and I want to get the 
most common number that appears in the list. This is trivial because i 
can do a max on each unique number. What I want to do is to have a 
tolerance to say that each number is not quite unique and if the 
difference from other numbers is small, than it can be counted together. 
This is what I have to get the common number (taken from the internet 
somewhere):

l = [10,30,20,20,11,12]
d = {}
tolerance = 5
for elm in l:
    d[elm] = d.get(elm, 0) + 1
counts = [(j,i) for i,j in d.items()]



This of course returns a list where each of them is unique

[(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]

but I am expecting a list that looks like this:

[(3, 10), (2, 20), (1, 30)]

What do I need to add?
Thanks for any help.
Cheers
Astan


From rushenaly at gmail.com  Fri Feb 20 04:25:43 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Fri, 20 Feb 2009 01:25:43 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<mailman.298.1235082947.11746.python-list@python.org> 
	<7xmyci3tf0.fsf@ruckus.brouhaha.com>
Message-ID: <ab85583b-d131-4745-b1f5-38ca7bee5fce@v39g2000yqm.googlegroups.com>

On 20 ?ubat, 01:20, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:

> I would say, slow execution is a drawback that we put up with in order
> to gain benefits of Python programming that are mostly unrelated to
> the causes of the slowness. ?The slowness itself can be addressed by
> technical means, such as native-code compilation and eliminating the
> GIL. ?I believe (for example) that the PyPy project is doing both of
> these.

Do you believe that there is an effort for removing gil with pypy.
As i know there is not an intend to remove gil with pypy. GIL will
be possibly used in PyPy. There is a mistake in your reply or mine.

Thank you
Rushen


From grflanagan at gmail.com  Fri Feb 20 05:15:42 2009
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Fri, 20 Feb 2009 10:15:42 +0000
Subject: get most common number in a list with tolerance
In-Reply-To: <499E6EC0.8090509@al.com.au>
References: <499E6EC0.8090509@al.com.au>
Message-ID: <gnlvsf$5j7$1@ger.gmane.org>

Astan Chee wrote:
> Hi,
> I have a list that has a bunch of numbers in it and I want to get the 
> most common number that appears in the list. This is trivial because i 
> can do a max on each unique number. What I want to do is to have a 
> tolerance to say that each number is not quite unique and if the 
> difference from other numbers is small, than it can be counted together. 
> This is what I have to get the common number (taken from the internet 
> somewhere):
> 
> l = [10,30,20,20,11,12]
> d = {}
> tolerance = 5
> for elm in l:
>    d[elm] = d.get(elm, 0) + 1
> counts = [(j,i) for i,j in d.items()]
> 
> 
> 
> This of course returns a list where each of them is unique
> 
> [(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]
> 
> but I am expecting a list that looks like this:
> 
> [(3, 10), (2, 20), (1, 30)]
> 

Maybe check for this number: tolerance * ( X / tolerance)

or a variation if tolerance is non-integer?

Eg. (rough):


from itertools import groupby


def tmax(seq, alpha):
     longest = []
     for k, g in groupby(sorted(seq), lambda x: alpha * (x / alpha)):
         g = list(g)
         if len(g) > len(longest):
             longest = g
     return longest[0]

a = [10, 30, 20, 20, 11, 12]


assert tmax(a, 5) == 10
assert tmax(a, 1) == 20




From sturlamolden at yahoo.no  Fri Feb 20 05:36:14 2009
From: sturlamolden at yahoo.no (sturlamolden)
Date: Fri, 20 Feb 2009 02:36:14 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
Message-ID: <db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com>

On Feb 20, 12:19 am, Mensanator <mensana... at aol.com> wrote:

> What am I actually seeing? If Python only uses one of the cores,
> why do both light up?

Because of OS scheduling. You have more than one process running. The
Python process does not stay on one core. Try to put CPython into a
tight loop ("while 1: pass"). You will see ~50% use of both cores. If
you had 4 cores, you would see ~25% use.


> Is everything much more complicated (due to
> OS scheduling, etc.) than the simple explanations of GIL?

No. Your Python code cannot use more than one core simultaneously.
It's just that scheduling happens so fast and so often that you don't
notice it.







From nick at craig-wood.com  Fri Feb 20 06:31:54 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Fri, 20 Feb 2009 05:31:54 -0600
Subject: How do I declare global vars or class vars in Python ?
References: <mailman.114.1234882494.11746.python-list@python.org>
Message-ID: <slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>

Linuxguy123 <linuxguy123 at gmail.com> wrote:
>  How do I do this in Python ?
> 
>  #############################
>  declare A,B
> 
>  function getA
>      return A
> 
>  function getB
>      return B
> 
>  function setA(value)
>       A = value
> 
>  function setB(value)
>       B = value
> 
>  main()
>      getA
>      getB
>      dosomething
>      setA(aValue)
>      setB(aValue)
>  ############################
> 
>  The part I don't know to do is declare the variables, either as globals
>  or as vars in a class.  How is this done in Python without setting them
>  to a value ?

Variables can have any value in python so if you want to pre-declare
then you set them to None normally.

As a class :-

class Stuff(object):
    def __init__(self):
        self.A = None
        self.B = None
    def getA(self):
        return self.A
    def getB(self):
        return self.B
    def setA(self, value):
        self.A = value
    def setB(self, value):
        self.B = value

>>> a = Stuff()
>>> print a.getA()
None
>>> print a.getB()
None
>>> # dosomething
... a.setA("aValue")
>>> a.setB("aValue")
>>> print a.getA()
aValue
>>> print a.getB()
aValue
>>> 

Note that in python we don't normally bother with getA/setA normally,
just use self.A, eg

class Stuff(object):
    def __init__(self):
        self.A = None
        self.B = None
    def main(self):
        print self.A
        print self.B
        # dosomething
        self.A = "aValue"
        self.B = "aValue"
        print self.A
        print self.B

>>> a = Stuff()
>>> a.main()
None
None
aValue
aValue
>>>  

If you need (later) A to be a computed value then you turn it into a
property, which would look like this.  (Note the main method is
identical to that above).

class Stuff(object):
    def __init__(self):
        self._A = None
        self.B = None
    def _getA(self):
        print "Getting A"
        return self._A
    def _setA(self, value):
        print "Setting A"
        self._A = value
    A = property(_getA, _setA)
    def main(self):
        print self.A
        print self.B
        # dosomething
        self.A = "aValue"
        self.B = "aValue"
        print self.A
        print self.B

>>> a = Stuff()
>>> a.main()
Getting A
None
None
Setting A
Getting A
aValue
aValue
>>>  

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 07:13:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 10:13:59 -0200
Subject: email varification using smtplib or any method
References: <ad2372b70902192058re1bd1abic5654b60ba6c3590@mail.gmail.com>
Message-ID: <op.upnf9l2ax6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 02:58:24 -0200, jitendra gupta <jitu.icfai at gmail.com>  
escribi?:

> when i am changing
> msg['To'] = "wronguser at wrongdomain.comddsdjsdsdsjdh"
> some wrong email then i am getting back failure notice in my inbox,  
> which i
> dont want..
> is there any way so that i can identify wrong email during the run time
> (when i am sending  the email)

In practice, no, due to spam.
If you connect directly to the destination SMTP (instead of your own), you  
could try the VRFY command (if supported by the server); but most servers  
just return a generic 252 response.

-- 
Gabriel Genellina



From mkhitrov at gmail.com  Fri Feb 20 07:23:09 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 20 Feb 2009 07:23:09 -0500
Subject: Strange array.array performance
In-Reply-To: <w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>
References: <26ddd1750902191052i4e5caa21s2a4e32ff2d2d6e45@mail.gmail.com>
	<gnkcah$rqa$1@ger.gmane.org>
	<mailman.278.1235073207.11746.python-list@python.org>
	<-MKdnYEu_r3SbwDUnZ2dnUVZ_gSWnZ2d@pdx.net>
	<mailman.317.1235095727.11746.python-list@python.org>
	<w7ednQKf37LWwwPUnZ2dnUVZ_qrinZ2d@pdx.net>
Message-ID: <26ddd1750902200423k6ede957arf6976ced8e835e01@mail.gmail.com>

On Fri, Feb 20, 2009 at 2:42 AM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> Maxim Khitrov wrote:
>>
>> ... Here's the function that I'll be using from now on. It gives me
>> exactly the behavior I need, with an int initializer being treated as
>> array size. Still not as efficient as it could be if supported
>> natively by array (one malloc instead of two + memmove + extra
>> function call), but very good performance nevertheless:
>>
>> from array import array as _array
>> array_null = dict((tc, '\0' * _array(tc).itemsize) for tc in
>> 'cbBuhHiIlLfd')
>
> How about:
>  array_null = dict((tc, _array(tc, (0,)).tostring() for tc in
> 'cbBuhHiIlLfd')
> ...
> (some ancient floating points did not use all-0 bytes for 0.0).

Didn't know that, thanks. I actually got rid of the dict, since
benchmarks showed access time to itemsize in the function itself is
not any slower than dict access. After going through all the different
speed tests yesterday the function now looks like this:

from array import array as _array

def array(typecode, init):
	if isinstance(init, int):
		a = _array(typecode, (0,))

		if a.itemsize * init > 1048576:
			return a * init
		else:
			a.fromstring((init - 1) * a.tostring())
			return a

	return _array(typecode, init)

This uses the fast fromstring operation when creating an array that is
less than 1MB in size. Over that, array multiplication is used, which
is slower, but doesn't require the extra memory.

- Max


From notvalid2 at sbcglobal.net  Fri Feb 20 07:30:21 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 04:30:21 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
Message-ID: <Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>

Matimus wrote:
> On Feb 19, 8:06 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>> I'm using IDLE for editing, but execute programs directly. If there are
>> execution or "compile" errors, the console closes before I can see what it
>> contains. How do I prevent that?
>> --
>>                                 W. eWatson
>>
>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>
>>                      Web Page: <www.speckledwithstars.net/>
> 
> Open a console window and type in the name of the script rather than
> just double clicking on it. Or, you can terminate your script with a
> 'raw_input("press enter to quit")'.
> 
> Matt
I can open the Python command line from Start, but how do I navigate to the 
folder where the program is?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From lie.1296 at gmail.com  Fri Feb 20 08:03:50 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Fri, 20 Feb 2009 13:03:50 +0000 (UTC)
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net>
	<gnkdal$bcq$01$1@news.t-online.com>
	<rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net>
Message-ID: <gnm9nl$34p$1@ger.gmane.org>

On Thu, 19 Feb 2009 13:03:59 -0800, Ron Garret wrote:

> In article <gnkdal$bcq$01$1 at news.t-online.com>,
>  Peter Otten <__peter__ at web.de> wrote:
> 
>> Ron Garret wrote:
>> 
>> > I'm trying to split a CamelCase string into its constituent
>> > components.
>> 
>> How about
>> 
>> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
>> ['foo', 'Bar', 'Baz']
> 
> That's very clever.  Thanks!
> 
>> > (BTW, I tried looking at the source code for the re module, but I
>> > could not find the relevant code.  re.split calls
>> > sre_compile.compile().split, but the string 'split' does not appear
>> > in sre_compile.py.  So where does this method come from?)
>> 
>> It's coded in C. The source is Modules/sremodule.c.
> 
> Ah.  Thanks!
> 
> rg

This re.split() doesn't consume character:

>>> re.split('([A-Z][a-z]*)', 'fooBarBaz')
['foo', 'Bar', '', 'Baz', '']

it does what the OP wants, albeit with extra blank strings. 



From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 08:04:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 14:04:15 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
Message-ID: <499eaa34$0$21372$426a74cc@news.free.fr>

Nick Craig-Wood a ?crit :
(snip)
> Note that in python we don't normally bother with getA/setA normally,
> just use self.A, eg
> 
> class Stuff(object):
>     def __init__(self):
>         self.A = None
>         self.B = None
>     def main(self):
>         print self.A
>         print self.B
>         # dosomething
>         self.A = "aValue"
>         self.B = "aValue"
>         print self.A
>         print self.B
> 
>>>> a = Stuff()
>>>> a.main()
> None
> None
> aValue
> aValue
>>>>  
> 
> If you need (later) A to be a computed value then you turn it into a
> property, which would look like this.  (Note the main method is
> identical to that above).
> 
> class Stuff(object):
>     def __init__(self):
>         self._A = None

Note that while you *can* do direct access to the implementation 
attribute (here, '_A' for property 'A'), you don't *need* to so (and 
usually shouldn't - unless you have a very compelling reason).


From alainpoint at yahoo.fr  Fri Feb 20 08:12:03 2009
From: alainpoint at yahoo.fr (alain)
Date: Fri, 20 Feb 2009 05:12:03 -0800 (PST)
Subject: import bug?
Message-ID: <b2f8933f-3f8b-4896-89d8-20dc642addea@v15g2000vbb.googlegroups.com>

Hi all,

Running python 2.5, i experience a strange behaviour with the
following code:import imputil

def handle_pye(fullpath, fileinfo, name):
    # Print a debugging message
    print 'Importing "%s" from "%s"' % (name,fullpath)
    data = open(fullpath).read()
    return 0, compile(data,fullpath,'exec'),{}

im = imputil.ImportManager()
im.add_suffix('.pye',handle_pye)
im.install()  # THIS SEEMS TO DO WEIRD THINGS TO SUBSEQUENT
IMPORTS !!!!

import functools

I then get the following traceback:
Traceback (most recent call last):
  File "D:\deleteme\New1.py", line 12, in <module>
    import functools
  File "C:\Python25\lib\imputil.py", line 103, in _import_hook
    top_module = self._import_top_module(parts[0])
  File "C:\Python25\lib\imputil.py", line 190, in _import_top_module
    module = self.fs_imp.import_from_dir(item, name)
  File "C:\Python25\lib\imputil.py", line 545, in import_from_dir
    return self._process_result(result, fqname)
  File "C:\Python25\lib\imputil.py", line 304, in _process_result
    exec code in module.__dict__
  File "C:\Python25\lib\functools.py", line 10, in <module>
    from _functools import partial
  File "C:\Python25\lib\imputil.py", line 106, in _import_hook
    raise ImportError, 'No module named ' + fqname
ImportError: No module named _functools


The mere fact of installing a custom importer seems to break the
import functionality.

Alain


From dns4 at cornell.edu  Fri Feb 20 08:14:34 2009
From: dns4 at cornell.edu (David Smith)
Date: Fri, 20 Feb 2009 08:14:34 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
Message-ID: <gnmabm$rah$1@ruby.cit.cornell.edu>

W. eWatson wrote:
> Matimus wrote:
>> On Feb 19, 8:06 pm, "W. eWatson" <notval... at sbcglobal.net> wrote:
>>> I'm using IDLE for editing, but execute programs directly. If there are
>>> execution or "compile" errors, the console closes before I can see
>>> what it
>>> contains. How do I prevent that?
>>> -- 
>>>                                 W. eWatson
>>>
>>>               (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>                Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet
>>>
>>>                      Web Page: <www.speckledwithstars.net/>
>>
>> Open a console window and type in the name of the script rather than
>> just double clicking on it. Or, you can terminate your script with a
>> 'raw_input("press enter to quit")'.
>>
>> Matt
> I can open the Python command line from Start, but how do I navigate to
> the folder where the program is?
> 

I'm not sure whether I should feel old or write a smart alec comment --
I suppose there are people in the world who don't know what to do with a
command prompt....

Assuming a Windows system:

2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
the single quote characters)
3. Drag/drop the folder containing your python script to your command
prompt window
4. Hit enter in your command prompt window.
5. Type python my_script_name.py to execute my_script_name.py.

--David


From bblais at bryant.edu  Fri Feb 20 08:32:36 2009
From: bblais at bryant.edu (Brian Blais)
Date: Fri, 20 Feb 2009 08:32:36 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
Message-ID: <E5586A8C-E935-45F8-8990-6C857A29958A@bryant.edu>

On Feb 19, 2009, at 23:06 , W. eWatson wrote:

> I'm using IDLE for editing, but execute programs directly.

Is there a reason you are executing them directly?  Why not just run  
the script from IDLE with Run/Run Module (F5) until you are sure  
there are no errors?  You can follow the advice already posted, by  
running it directly from the commandline.  Another hack is to put:

x=raw_input("pausing...")

at the end of your script, but this is really a hack and it would be  
better to use a different solution.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From notvalid2 at sbcglobal.net  Fri Feb 20 08:49:29 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 05:49:29 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <gnmabm$rah$1@ruby.cit.cornell.edu>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
Message-ID: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>


> 
> I'm not sure whether I should feel old or write a smart alec comment --
> I suppose there are people in the world who don't know what to do with a
> command prompt....
> 
> Assuming a Windows system:
> 
> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
> the single quote characters)
> 3. Drag/drop the folder containing your python script to your command
> prompt window
> 4. Hit enter in your command prompt window.
> 5. Type python my_script_name.py to execute my_script_name.py.
> 
> --David
If I enter just cd, then it tells me cd is not defined. If I enter 
c:/python25, it tells me I have a syntax error at c in c:. The title of the 
black background window I have up with a >>> prompt shown in it is 
"Python(command line)". Maybe this isn't the real Python console window?

What I want is that if I execute the program by double clicking on its name 
to display the console window with the program or syntax errors shown 
without it closing in a split second. Putting read_raw in it doesn't work, 
since some error prevents it from ever being seen.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From catherine.heathcote at gmail.com  Fri Feb 20 09:01:08 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 14:01:08 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <EIynl.37668$Sp5.26172@text.news.virginmedia.com>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter 
> c:/python25, it tells me I have a syntax error at c in c:. The title of 
> the black background window I have up with a >>> prompt shown in it is 
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its 
> name to display the console window with the program or syntax errors 
> shown without it closing in a split second. Putting read_raw in it 
> doesn't work, since some error prevents it from ever being seen.
> 

you need to open a dos prompt before doing the steps above. Go to 
start->run and hit "cmd" <enter> without the quotes.


From notvalid2 at sbcglobal.net  Fri Feb 20 09:05:08 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:05:08 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter 
> c:/python25, it tells me I have a syntax error at c in c:. The title of 
> the black background window I have up with a >>> prompt shown in it is 
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its 
> name to display the console window with the program or syntax errors 
> shown without it closing in a split second. Putting read_raw in it 
> doesn't work, since some error prevents it from ever being seen.
> 
Whoa! What's going on here? I just looked at About IDLE, and it shows 1.2.2, 
but yet the second edition of Learning Python talks about going to 2.3 as 
the book is about to go to press, 2004. I thought IDLE came bundled with 
Python. I have Py 2.5. 1.2.2??? Puzzled.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 09:18:20 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 12:18:20 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
Message-ID: <op.upnl0ubwx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:

> Whoa! What's going on here? I just looked at About IDLE, and it shows  
> 1.2.2, but yet the second edition of Learning Python talks about going  
> to 2.3 as the book is about to go to press, 2004. I thought IDLE came  
> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.

IDLE is a separate product; the version of IDLE that comes with Python  
2.5.4 is 1.2.4

-- 
Gabriel Genellina



From thomasmallen at gmail.com  Fri Feb 20 09:22:29 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Fri, 20 Feb 2009 06:22:29 -0800 (PST)
Subject: FTP libs for Python?
Message-ID: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>

I'm interested in writing a script to ease deployment of minor changes
on some websites here, and it would involve some SFTP transfers. Do
you know of good alternatives to ftplib, which is relatively low-
level?

Thomas


From notvalid2 at sbcglobal.net  Fri Feb 20 09:29:35 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:29:35 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <mailman.348.1235139524.11746.python-list@python.org>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
	<mailman.348.1235139524.11746.python-list@python.org>
Message-ID: <81znl.13277$D32.3772@flpi146.ffdc.sbc.com>

Gabriel Genellina wrote:
> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson <notvalid2 at sbcglobal.net> 
> escribi?:
> 
>> Whoa! What's going on here? I just looked at About IDLE, and it shows 
>> 1.2.2, but yet the second edition of Learning Python talks about going 
>> to 2.3 as the book is about to go to press, 2004. I thought IDLE came 
>> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
> 
> IDLE is a separate product; the version of IDLE that comes with Python 
> 2.5.4 is 1.2.4
> 
Where do I get 2.x.x, or the latest?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From evert.rol at gmail.com  Fri Feb 20 09:30:26 2009
From: evert.rol at gmail.com (Evert Rol)
Date: Fri, 20 Feb 2009 15:30:26 +0100
Subject: Framework installation of 2.6 on OS X, with specified prefix
Message-ID: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>

   Hi,

I'm trying to install Python 2.6 from source on Mac OS X.5, in its own  
directory using a framework install. That goes fine, up to the point  
where it wants to install the applications that come with it (eg, the  
Wish shell): it tries to install things into /Applications, instead of  
eg <prefix>/Applications.
Here's my configure line (the flags are there just to let it find my  
own installed readline):

CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
enable-shared --enable-framework=/sw/Library/Frameworks --with- 
readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5


And the last part of the output of 'make install':

../python.exe ./scripts/BuildApplet.py \
		--destroot "" \
		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/ 
MacOS/Python-32" && echo "-32"`  \
		--output "/sw/Applications/Python 2.6/Build Applet.app" \
		./scripts/BuildApplet.py
cd PythonLauncher && make install DESTDIR=
test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
2.6"
mkdir: /Applications/Python 2.6: Permission denied
make[2]: *** [install] Error 1
make[1]: *** [install_PythonLauncher] Error 2
make: *** [frameworkinstallapps] Error 2


Is there an option on the configure line that I need to set, or  
something in setup.py? Or perhaps hack the Makefile?

   Evert



From luke.dunn at gmail.com  Fri Feb 20 09:31:03 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 06:31:03 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 1,2,3
Message-ID: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>

anyone interested in looking at the following problem.

we are trying to express numbers as minimal expressions using only the
digits one two and three, with conventional arithmetic. so for
instance

33 = 2^(3+2)+1 = 3^3+(3*2)

are both minimal, using 4 digits but

33 = ((3+2)*2+1)*3

using 5 is not.

I have tried coding a function to return the minimal representation
for any integer, but haven't cracked it so far. The naive first
attempt is to generate lots of random strings, eval() them and sort by
size and value. this is inelegant and slow.

I have a dim intuition that it could be done with a very clever bit of
recursion, but the exact form so far eludes me.


From notvalid2 at sbcglobal.net  Fri Feb 20 09:39:14 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 06:39:14 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <EIynl.37668$Sp5.26172@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
Message-ID: <caznl.13278$D32.2@flpi146.ffdc.sbc.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>>
>>>
>>> I'm not sure whether I should feel old or write a smart alec comment --
>>> I suppose there are people in the world who don't know what to do with a
>>> command prompt....
>>>
>>> Assuming a Windows system:
>>>
>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>>> the single quote characters)
>>> 3. Drag/drop the folder containing your python script to your command
>>> prompt window
>>> 4. Hit enter in your command prompt window.
>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>
>>> --David
>> If I enter just cd, then it tells me cd is not defined. If I enter 
>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>> of the black background window I have up with a >>> prompt shown in it 
>> is "Python(command line)". Maybe this isn't the real Python console 
>> window?
>>
>> What I want is that if I execute the program by double clicking on its 
>> name to display the console window with the program or syntax errors 
>> shown without it closing in a split second. Putting read_raw in it 
>> doesn't work, since some error prevents it from ever being seen.
>>
> 
> you need to open a dos prompt before doing the steps above. Go to 
> start->run and hit "cmd" <enter> without the quotes.
Something is amiss here. There's the MS Command Prompt, which I'm looking at 
right now. Yes, it has cd, and so on. I'm also looking at the Python command 
line window. It allow one to run interactively.

If I write a simple python program with just raw_input, by clicking on the 
file name, I get a window with the the title "\Python25\pythonexe" that 
shows the prompt. If I deliberately put a syntax error in the program, and 
run it by clicking the file, then A window appears and disappears so quickly 
that I have no idea what it said. How do I keep that window up?

Which, if any, of these is the real Python console? What is the window 
called in the example I gave with raw_input?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From vriolk at gmail.com  Fri Feb 20 09:41:51 2009
From: vriolk at gmail.com (coldpizza)
Date: Fri, 20 Feb 2009 06:41:51 -0800 (PST)
Subject: Newbie request assistance....Python - PAMIE - Java
References: <c8e0768f-0407-4c9f-a9db-d4a89089511a@v19g2000yqn.googlegroups.com>
Message-ID: <ed543329-1f71-4e1a-b42d-e122bf301cdf@j8g2000yql.googlegroups.com>

This is not a Pamie issue. Pamie can only see the HTML part of the
page. Any object embedded in the page using the <object> or <embed>
tags is not accessible to the browser, and the browser has no idea
what is inside those objects - it simply passes control to the
corresponding plugin, such as Java, Flash, ActiveX, etc.

To script user interaction with an applet you will probably need some
expensive commercial software such as QuickTestPro or SilkTest.

Pamie is IE-only and does not seem to be actively developed. If you
need a good and robust HTML testing framework look into Selenium,
especially Selenium Remote Control, which can be used with a number of
languages including Python.

As for embedded stuff like Flash or Java applets, there is no freeware
tool that I am aware of which would be able to work with both HTML and
stuff like Flash or Java applets.

Best,
cp

On Feb 19, 10:50?pm, frankrentef <frankren... at yahoo.com> wrote:
> Greetings all...
>
> Newbie here to the Python world. ?I've written some basic script with
> the purpose of automating testing of an application via Python /
> Pamie. ?I've had pretty good success until a spot I'm testing displays
> a Java pop up. ?I need to have Pamie access the fields in the window
> (i.e. add a value and activate the "enter" button.) ?Can someone
> assist.
>
> Some of the code I have currently is as follows...when the script I've
> written gets to the end the java window pops up automatically....I
> don't understand how to interface with it.
>
> THNX
>
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMAX', '5000.00')
> time.sleep(2)
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMIN', '0')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_Bocarc1_ckCheckMicr')
> ie.timesleep(2)
> ie.textBoxSet('_ctl0_ContentPlaceHolder1_Bocarc1_txtMaxMicrRejects',
> '1')
> time.sleep(2)
> ie.buttonClick('_ctl0_ContentPlaceHolder1_arc1_btnUpdate')
> time.sleep2



From catherine.heathcote at gmail.com  Fri Feb 20 09:43:50 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 14:43:50 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <caznl.13278$D32.2@flpi146.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
Message-ID: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>

W. eWatson wrote:
> Catherine Heathcote wrote:
>> W. eWatson wrote:
>>>
>>>>
>>>> I'm not sure whether I should feel old or write a smart alec comment --
>>>> I suppose there are people in the world who don't know what to do 
>>>> with a
>>>> command prompt....
>>>>
>>>> Assuming a Windows system:
>>>>
>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>> (w/o
>>>> the single quote characters)
>>>> 3. Drag/drop the folder containing your python script to your command
>>>> prompt window
>>>> 4. Hit enter in your command prompt window.
>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>
>>>> --David
>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>> of the black background window I have up with a >>> prompt shown in 
>>> it is "Python(command line)". Maybe this isn't the real Python 
>>> console window?
>>>
>>> What I want is that if I execute the program by double clicking on 
>>> its name to display the console window with the program or syntax 
>>> errors shown without it closing in a split second. Putting read_raw 
>>> in it doesn't work, since some error prevents it from ever being seen.
>>>
>>
>> you need to open a dos prompt before doing the steps above. Go to 
>> start->run and hit "cmd" <enter> without the quotes.
> Something is amiss here. There's the MS Command Prompt, which I'm 
> looking at right now. Yes, it has cd, and so on. I'm also looking at the 
> Python command line window. It allow one to run interactively.
> 
> If I write a simple python program with just raw_input, by clicking on 
> the file name, I get a window with the the title "\Python25\pythonexe" 
> that shows the prompt. If I deliberately put a syntax error in the 
> program, and run it by clicking the file, then A window appears and 
> disappears so quickly that I have no idea what it said. How do I keep 
> that window up?
> 
> Which, if any, of these is the real Python console? What is the window 
> called in the example I gave with raw_input?
> 

Run the program from within the MS command line, not by double clicking it.


From vriolk at gmail.com  Fri Feb 20 09:45:23 2009
From: vriolk at gmail.com (coldpizza)
Date: Fri, 20 Feb 2009 06:45:23 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <c58e9e7b-fb91-4822-a191-a97e3a8ff4cd@b16g2000yqb.googlegroups.com>

Why don't you just use Curl? It does a dozen of protocols including
SFTP. And if the command line version is not enough for you then there
are Python bindings for Curl.

On Feb 20, 4:22?pm, Thomas Allen <thomasmal... at gmail.com> wrote:
> I'm interested in writing a script to ease deployment of minor changes
> on some websites here, and it would involve some SFTP transfers. Do
> you know of good alternatives to ftplib, which is relatively low-
> level?
>
> Thomas



From mensanator at aol.com  Fri Feb 20 09:47:12 2009
From: mensanator at aol.com (Mensanator)
Date: Fri, 20 Feb 2009 06:47:12 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com>
Message-ID: <be4c6e60-518d-42e5-972a-ad0b91c4e22a@a12g2000yqm.googlegroups.com>

On Feb 20, 4:36?am, sturlamolden <sturlamol... at yahoo.no> wrote:
> On Feb 20, 12:19 am, Mensanator <mensana... at aol.com> wrote:
>
> > What am I actually seeing? If Python only uses one of the cores,
> > why do both light up?
>
> Because of OS scheduling. You have more than one process running. The
> Python process does not stay on one core. Try to put CPython into a
> tight loop ("while 1: pass"). You will see ~50% use of both cores. If
> you had 4 cores, you would see ~25% use.

Saw that once when I had access to a four core machine.

>
> > Is everything much more complicated (due to
> > OS scheduling, etc.) than the simple explanations of GIL?
>
> No.

Don't you mean "yes"?

> Your Python code cannot use more than one core simultaneously.
> It's just that scheduling happens so fast and so often that you don't
> notice it.

Or that the Task Manager can't track the switches fast
enough to show the interleaving giving the illusion that
both cores are operating simultaneously.


From bsk16 at case.edu  Fri Feb 20 09:47:17 2009
From: bsk16 at case.edu (Ben Kaplan)
Date: Fri, 20 Feb 2009 09:47:17 -0500
Subject: Framework installation of 2.6 on OS X, with specified prefix
In-Reply-To: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
Message-ID: <927B41A1-E800-4D8C-B9C5-480531B8DA68@case.edu>



On Feb 20, 2009, at 9:30 AM, Evert Rol <evert.rol at gmail.com> wrote:

>  Hi,
>
> I'm trying to install Python 2.6 from source on Mac OS X.5, in its  
> own directory using a framework install. That goes fine, up to the  
> point where it wants to install the applications that come with it  
> (eg, the Wish shell): it tries to install things into /Applications,  
> instead of eg <prefix>/Applications.
> Here's my configure line (the flags are there just to let it find my  
> own installed readline):
>
> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
> enable-shared --enable-framework=/sw/Library/Frameworks --with- 
> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
>
>
> And the last part of the output of 'make install':
>
> ../python.exe ./scripts/BuildApplet.py \
>        --destroot "" \
>        --python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/ 
> Contents/MacOS/Python-32" && echo "-32"`  \
>        --output "/sw/Applications/Python 2.6/Build Applet.app" \
>        ./scripts/BuildApplet.py
> cd PythonLauncher && make install DESTDIR=
> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
> 2.6"
> mkdir: /Applications/Python 2.6: Permission denied
> make[2]: *** [install] Error 1
> make[1]: *** [install_PythonLauncher] Error 2
> make: *** [frameworkinstallapps] Error 2
>
>
> Is there an option on the configure line that I need to set, or  
> something in setup.py? Or perhaps hack the Makefile?
>
>  Evert
>


It's a security thing- only root can write to directories like / 
Applications. You need to run " sudo make install". You'll be promoted  
for your password and then it will install.
> --
> http://mail.python.org/mailman/listinfo/python-list


From mrmakent at cox.net  Fri Feb 20 09:48:07 2009
From: mrmakent at cox.net (Mike Kent)
Date: Fri, 20 Feb 2009 06:48:07 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>

I use Fabric (http://www.nongnu.org/fab/) as my Python-based
deployment tool, but it uses ssh/scp, not sftp.


From exarkun at divmod.com  Fri Feb 20 10:02:39 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Fri, 20 Feb 2009 10:02:39 -0500
Subject: FTP libs for Python?
In-Reply-To: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
Message-ID: <20090220150239.12853.960662794.divmod.quotient.12154@henry.divmod.com>

On Fri, 20 Feb 2009 06:22:29 -0800 (PST), Thomas Allen <thomasmallen at gmail.com> wrote:
>I'm interested in writing a script to ease deployment of minor changes
>on some websites here, and it would involve some SFTP transfers. Do
>you know of good alternatives to ftplib, which is relatively low-
>level?

Twisted includes FTP and SFTP support.

Jean-Paul


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:03:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:03:41 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>
	<mailman.348.1235139524.11746.python-list@python.org>
	<81znl.13277$D32.3772@flpi146.ffdc.sbc.com>
Message-ID: <op.upnn4fxqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:29:35 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:

> Gabriel Genellina wrote:
>> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson  
>> <notvalid2 at sbcglobal.net> escribi?:
>>
>>> Whoa! What's going on here? I just looked at About IDLE, and it shows  
>>> 1.2.2, but yet the second edition of Learning Python talks about going  
>>> to 2.3 as the book is about to go to press, 2004. I thought IDLE came  
>>> bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
>>  IDLE is a separate product; the version of IDLE that comes with Python  
>> 2.5.4 is 1.2.4
>>
> Where do I get 2.x.x, or the latest?

You may update your Python version to 2.5.4 (the latest release in the 2.5  
series).  Then IDLE will report 1.2.4.  They are separate products, their  
version numbers are uncorrelated.

-- 
Gabriel Genellina



From kom2 at centrum.cz  Fri Feb 20 10:10:13 2009
From: kom2 at centrum.cz (Kom2)
Date: Fri, 20 Feb 2009 07:10:13 -0800 (PST)
Subject: Running script in module initialization
Message-ID: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>

Hello,
I'm trying to convert my project from python 2.5 to python 3.0 and I
have the following problem. My project is PYD library written in C++.
So I have this PyInit_ModuleName function containing PyModule_Create
call and this function also call some script with declarations:


   PyObject* m;

   m = PyModule_Create(&PyVRDAModule);
   if (m == NULL) {
      return NULL;
   }
   PyObject *d, *v;
   d = PyModule_GetDict(m);
   v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
d, NULL);
   ......



txtPyPredefinedConstants is string with this content:

class CursorMoveType:
   First = 0
   Last = 1
   Next = 2
   Previous = 3
   Bookmark = 4
   NewRecord = 5


In Python 2.5 everything works fine, now in python3.0
PyRun_StringFlags returns NULL and I get error "__build_class__ not
found".

Can anybody tell mi please, what is wrong?

thanks Kom2


From patrick.oloughlin at gmail.com  Fri Feb 20 10:16:13 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 15:16:13 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499eaa34$0$21372$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
Message-ID: <cc34a9320902200716t41c957e0rec51243468ae541e@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
> Note that while you *can* do direct access to the implementation attribute
> (here, '_A' for property 'A'), you don't *need* to so (and usually shouldn't
> - unless you have a very compelling reason).

Interesting. Why shouldn't you?
I haven't used the property() function before and probably have no
call to, but when you say "usually shouldn't", what is there against
it?

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From thomasmallen at gmail.com  Fri Feb 20 10:24:37 2009
From: thomasmallen at gmail.com (Thomas Allen)
Date: Fri, 20 Feb 2009 07:24:37 -0800 (PST)
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
	<ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>
Message-ID: <19a392ba-1ecd-4e92-8636-c684281ed93f@x10g2000yqk.googlegroups.com>

On Feb 20, 9:45 am, coldpizza <vri... at gmail.com> wrote:
> Why don't you just use Curl? It does a dozen of protocols including
> SFTP. And if the command line version is not enough for you then there
> are Python bindings for Curl.

I'm actually hoping to eventually package these tools using py2exe for
some co-workers, which is why I'm not looking to Unix utilities

On Feb 20, 9:48?am, Mike Kent <mrmak... at cox.net> wrote:
> I use Fabric (http://www.nongnu.org/fab/) as my Python-based
> deployment tool, but it uses ssh/scp, not sftp.

I'm looking at Paramiko right now which I saw some people
recommending, as SSH utils are required as well....

Thomas


From vincent at vincentdavis.net  Fri Feb 20 10:25:51 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Fri, 20 Feb 2009 08:25:51 -0700
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <77e831100902200725s505be71exa4726f72ac849a9f@mail.gmail.com>

Having looked long at this how does the prime factorization play into this.
I would consider an approach similar to factoring a number. Of course the
issue with prime factoring is your ned to know the primes. I assume this
would be a similar problem you may need to know the solutions to the
factors. I might look closer at this please post if you come across a
solution.
Thanks
Vincent Davis
720-301-3003


On Fri, Feb 20, 2009 at 7:31 AM, Trip Technician <luke.dunn at gmail.com>wrote:

> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:26:09 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:26:09 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
Message-ID: <op.upno5vjax6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 12:39:14 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:
> Catherine Heathcote wrote:

>>  you need to open a dos prompt before doing the steps above. Go to  
>> start->run and hit "cmd" <enter> without the quotes.
> Something is amiss here. There's the MS Command Prompt, which I'm  
> looking at right now. Yes, it has cd, and so on. I'm also looking at the  
> Python command line window. It allow one to run interactively.

Open a command prompt ("CMD", "Console"), that black window you were  
looking at.
Use the cd command to change directory to wherever your Python script is  
saved.
Execute "python -V" (without the quotes). You should get a response,  
including the Python version number. If you get an error like "command not  
found" or similar, you'll have to use the whole path to python.exe -- try  
with "c:\python25\python -V" (again, no quotes).
Once you know how to launch Python, you can:

a) Enter the interactive interpreter: Just launch Python as above but  
without the -V argument. The prompt is now >>>
You can type Python expressions and the interpreter evaluates them. You  
type 2+3, the interpreter answers 5; you type len("abc"), the interpreter  
answers 3...

b) Or, from the command prompt, you can execute a script by launching  
Python the same way as above, passing the script name as an argument:

c:\foo>python script_name.py

This is what you were looking for - in case of syntax errors or something,  
you can see the output on the console. It stays open because it was open  
*before* you launched Python. Just keep the window open.

See http://docs.python.org/using/windows.html for more info. If Python  
doesn't start just by typing "python", you may want to set your PATH  
environment variable as described there.

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Feb 20 10:27:43 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 10:27:43 -0500
Subject: Running script in module initialization
In-Reply-To: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
Message-ID: <gnmi5p$336$1@ger.gmane.org>

Kom2 wrote:
> Hello,
> I'm trying to convert my project from python 2.5 to python 3.0 and I
> have the following problem. My project is PYD library written in C++.
> So I have this PyInit_ModuleName function containing PyModule_Create
> call and this function also call some script with declarations:
> 
> 
>    PyObject* m;
> 
>    m = PyModule_Create(&PyVRDAModule);
>    if (m == NULL) {
>       return NULL;
>    }
>    PyObject *d, *v;
>    d = PyModule_GetDict(m);
>    v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> d, NULL);
>    ......
> 
> 
> 
> txtPyPredefinedConstants is string with this content:
> 
> class CursorMoveType:
>    First = 0
>    Last = 1
>    Next = 2
>    Previous = 3
>    Bookmark = 4
>    NewRecord = 5
> 
> 
> In Python 2.5 everything works fine, now in python3.0
> PyRun_StringFlags returns NULL and I get error "__build_class__ not
> found".
> 
> Can anybody tell mi please, what is wrong?
> 
Presumably you haven't upgraded your extension module to use the new API?

  http://wiki.python.org/moin/PortingExtensionModulesToPy3k

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From notvalid2 at sbcglobal.net  Fri Feb 20 10:37:06 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:37:06 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
Message-ID: <N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>> Catherine Heathcote wrote:
>>> W. eWatson wrote:
>>>>
>>>>>
>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>> comment --
>>>>> I suppose there are people in the world who don't know what to do 
>>>>> with a
>>>>> command prompt....
>>>>>
>>>>> Assuming a Windows system:
>>>>>
>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>>> (w/o
>>>>> the single quote characters)
>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>> prompt window
>>>>> 4. Hit enter in your command prompt window.
>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>
>>>>> --David
>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>>> of the black background window I have up with a >>> prompt shown in 
>>>> it is "Python(command line)". Maybe this isn't the real Python 
>>>> console window?
>>>>
>>>> What I want is that if I execute the program by double clicking on 
>>>> its name to display the console window with the program or syntax 
>>>> errors shown without it closing in a split second. Putting read_raw 
>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>
>>>
>>> you need to open a dos prompt before doing the steps above. Go to 
>>> start->run and hit "cmd" <enter> without the quotes.
>> Something is amiss here. There's the MS Command Prompt, which I'm 
>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>> the Python command line window. It allow one to run interactively.
>>
>> If I write a simple python program with just raw_input, by clicking on 
>> the file name, I get a window with the the title "\Python25\pythonexe" 
>> that shows the prompt. If I deliberately put a syntax error in the 
>> program, and run it by clicking the file, then A window appears and 
>> disappears so quickly that I have no idea what it said. How do I keep 
>> that window up?
>>
>> Which, if any, of these is the real Python console? What is the window 
>> called in the example I gave with raw_input?
>>
> 
> Run the program from within the MS command line, not by double clicking it.
Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS 
commands. I get to drill my way down 4 levels of folders. What DOS cmd 
allows one to list only folders?

Still, why would one design a window that disappears, when it has useful 
data in it? I see that if I click on the window, it has properties, width, 
height, etc.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 10:38:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 13:38:41 -0200
Subject: FTP libs for Python?
References: <031c6600-b8fb-49d6-bf24-aa12ff494376@p20g2000yqi.googlegroups.com>
	<ccb08f96-4791-4df8-a773-2329fd7042a8@x10g2000yqk.googlegroups.com>
	<19a392ba-1ecd-4e92-8636-c684281ed93f@x10g2000yqk.googlegroups.com>
Message-ID: <op.upnpqribx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 13:24:37 -0200, Thomas Allen <thomasmallen at gmail.com>  
escribi?:

> On Feb 20, 9:45 am, coldpizza <vri... at gmail.com> wrote:
>> Why don't you just use Curl? It does a dozen of protocols including
>> SFTP. And if the command line version is not enough for you then there
>> are Python bindings for Curl.
>
> I'm actually hoping to eventually package these tools using py2exe for
> some co-workers, which is why I'm not looking to Unix utilities

curl works on Windows too.

-- 
Gabriel Genellina



From wiggly at wiggly.org  Fri Feb 20 10:39:22 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 15:39:22 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <499ECEAA.30103@wiggly.org>

Trip Technician wrote:
> anyone interested in looking at the following problem.

if you can give me a good reason why this is not homework I'd love to 
hear it...I just don't see how this is a real problem.

> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
> 
> 33 = 2^(3+2)+1 = 3^3+(3*2)
> 
> are both minimal, using 4 digits but
> 
> 33 = ((3+2)*2+1)*3
> 
> using 5 is not.
> 
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.

Wow. Okay, what other ways have you tried so far? Or are you beating 
your head against the "search the entire problem space" solution still?

This problem smells a lot like factorisation, so I would think of it in 
terms of wanting to reduce the target number using as few operations as 
possible.

If you allow exponentiation that's going to be your biggest hitter so 
you know that the best you can do using 2 digits is n^n where n is the 
largest digit you allow yourself.

Are you going to allow things like n^n^n or not?

   n




From notvalid2 at sbcglobal.net  Fri Feb 20 10:39:30 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:39:30 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <mailman.352.1235142250.11746.python-list@python.org>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<dGynl.13276$D32.8207@flpi146.ffdc.sbc.com>	<mailman.348.1235139524.11746.python-list@python.org>	<81znl.13277$D32.3772@flpi146.ffdc.sbc.com>
	<mailman.352.1235142250.11746.python-list@python.org>
Message-ID: <18Anl.14217$as4.4271@nlpi069.nbdc.sbc.com>

Gabriel Genellina wrote:
> En Fri, 20 Feb 2009 12:29:35 -0200, W. eWatson <notvalid2 at sbcglobal.net> 
> escribi?:
> 
>> Gabriel Genellina wrote:
>>> En Fri, 20 Feb 2009 12:05:08 -0200, W. eWatson 
>>> <notvalid2 at sbcglobal.net> escribi?:
>>>
>>>> Whoa! What's going on here? I just looked at About IDLE, and it 
>>>> shows 1.2.2, but yet the second edition of Learning Python talks 
>>>> about going to 2.3 as the book is about to go to press, 2004. I 
>>>> thought IDLE came bundled with Python. I have Py 2.5. 1.2.2??? Puzzled.
>>>  IDLE is a separate product; the version of IDLE that comes with 
>>> Python 2.5.4 is 1.2.4
>>>
>> Where do I get 2.x.x, or the latest?
> 
> You may update your Python version to 2.5.4 (the latest release in the 
> 2.5 series).  Then IDLE will report 1.2.4.  They are separate products, 
> their version numbers are uncorrelated.
> 
Ah, I see, the book is referring to version 2.3 of Python and not IDLE.

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From dns4 at cornell.edu  Fri Feb 20 10:41:42 2009
From: dns4 at cornell.edu (David Smith)
Date: Fri, 20 Feb 2009 10:41:42 -0500
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
Message-ID: <gnmivj$f78$1@ruby.cit.cornell.edu>

W. eWatson wrote:
> 
>>
>> I'm not sure whether I should feel old or write a smart alec comment --
>> I suppose there are people in the world who don't know what to do with a
>> command prompt....
>>
>> Assuming a Windows system:
>>
>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>> the single quote characters)
>> 3. Drag/drop the folder containing your python script to your command
>> prompt window
>> 4. Hit enter in your command prompt window.
>> 5. Type python my_script_name.py to execute my_script_name.py.
>>
>> --David
> If I enter just cd, then it tells me cd is not defined. If I enter
> c:/python25, it tells me I have a syntax error at c in c:. The title of
> the black background window I have up with a >>> prompt shown in it is
> "Python(command line)". Maybe this isn't the real Python console window?
> 
> What I want is that if I execute the program by double clicking on its
> name to display the console window with the program or syntax errors
> shown without it closing in a split second. Putting read_raw in it
> doesn't work, since some error prevents it from ever being seen.
> 

What I meant was open open the command prompt, type cd, space, DO NOT
hit enter yet.  Drag the folder with your script into the command prompt
window.  Then go to the command prompt window and hit enter.  This
should compose a command similar to the following:

C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
Documents\My Project"

C:\Documents and Settings\user\My Documents\My Project> _

--David


From catherine.heathcote at gmail.com  Fri Feb 20 10:45:56 2009
From: catherine.heathcote at gmail.com (Catherine Heathcote)
Date: Fri, 20 Feb 2009 15:45:56 GMT
Subject: Keeping the Console Open with IDLE
In-Reply-To: <N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
	<N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
Message-ID: <UeAnl.37694$Sp5.29793@text.news.virginmedia.com>

W. eWatson wrote:
> Catherine Heathcote wrote:
>> W. eWatson wrote:
>>> Catherine Heathcote wrote:
>>>> W. eWatson wrote:
>>>>>
>>>>>>
>>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>>> comment --
>>>>>> I suppose there are people in the world who don't know what to do 
>>>>>> with a
>>>>>> command prompt....
>>>>>>
>>>>>> Assuming a Windows system:
>>>>>>
>>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt 
>>>>>> window (w/o
>>>>>> the single quote characters)
>>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>>> prompt window
>>>>>> 4. Hit enter in your command prompt window.
>>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>>
>>>>>> --David
>>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>>> c:/python25, it tells me I have a syntax error at c in c:. The 
>>>>> title of the black background window I have up with a >>> prompt 
>>>>> shown in it is "Python(command line)". Maybe this isn't the real 
>>>>> Python console window?
>>>>>
>>>>> What I want is that if I execute the program by double clicking on 
>>>>> its name to display the console window with the program or syntax 
>>>>> errors shown without it closing in a split second. Putting read_raw 
>>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>>
>>>>
>>>> you need to open a dos prompt before doing the steps above. Go to 
>>>> start->run and hit "cmd" <enter> without the quotes.
>>> Something is amiss here. There's the MS Command Prompt, which I'm 
>>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>>> the Python command line window. It allow one to run interactively.
>>>
>>> If I write a simple python program with just raw_input, by clicking 
>>> on the file name, I get a window with the the title 
>>> "\Python25\pythonexe" that shows the prompt. If I deliberately put a 
>>> syntax error in the program, and run it by clicking the file, then A 
>>> window appears and disappears so quickly that I have no idea what it 
>>> said. How do I keep that window up?
>>>
>>> Which, if any, of these is the real Python console? What is the 
>>> window called in the example I gave with raw_input?
>>>
>>
>> Run the program from within the MS command line, not by double 
>> clicking it.
> Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS 
> commands. I get to drill my way down 4 levels of folders. What DOS cmd 
> allows one to list only folders?
> 
> Still, why would one design a window that disappears, when it has useful 
> data in it? I see that if I click on the window, it has properties, 
> width, height, etc.
> 

Thats programming. Whaterver the language, you will need to be 
comfortable with the CLI of your operating system.


From luke.dunn at gmail.com  Fri Feb 20 10:52:10 2009
From: luke.dunn at gmail.com (Luke Dunn)
Date: Fri, 20 Feb 2009 15:52:10 +0000
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <499ECEAA.30103@wiggly.org>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
Message-ID: <b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>

I am teaching myself coding. No university or school, so i guess its
homework if you like. i am interested in algorithms generally, after doing
some of Project Euler. Of course my own learning process is best served by
just getting on with it but sometimes you will do that while other times you
might just choose to ask for help. if no one suggests then i will probably
shelve it and come back to it myself when I'm fresh.

no it's not a real world problem but my grounding is in math so i like pure
stuff anyway. don't see how that is a problem, as a math person i accept the
validity of pure research conducted just for curiosity and aesthetic
satisfaction. it often finds an application later anyway

Thanks for your helpful suggestion of trying other methods and i will do
that in time. my motive was to share an interesting problem because a human
of moderate math education can sit down with this and find minimal solutions
easily but the intuition they use is quite subtle, hence the idea of
converting the human heuristic into an algorithm became of interest, and
particularly a recursive one. i find that the development of a piece of
recursion usually comes as an 'aha', and since i hadn't had such a moment, i
thought i'd turn the problem loose on the public. also i found no online
reference to this problem so it seemed ripe for sharing.

On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org> wrote:

> Trip Technician wrote:
>
>> anyone interested in looking at the following problem.
>>
>
> if you can give me a good reason why this is not homework I'd love to hear
> it...I just don't see how this is a real problem.
>
> we are trying to express numbers as minimal expressions using only the
>> digits one two and three, with conventional arithmetic. so for
>> instance
>>
>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>>
>> are both minimal, using 4 digits but
>>
>> 33 = ((3+2)*2+1)*3
>>
>> using 5 is not.
>>
>> I have tried coding a function to return the minimal representation
>> for any integer, but haven't cracked it so far. The naive first
>> attempt is to generate lots of random strings, eval() them and sort by
>> size and value. this is inelegant and slow.
>>
>
> Wow. Okay, what other ways have you tried so far? Or are you beating your
> head against the "search the entire problem space" solution still?
>
> This problem smells a lot like factorisation, so I would think of it in
> terms of wanting to reduce the target number using as few operations as
> possible.
>
> If you allow exponentiation that's going to be your biggest hitter so you
> know that the best you can do using 2 digits is n^n where n is the largest
> digit you allow yourself.
>
> Are you going to allow things like n^n^n or not?
>
>  n
>
>
>
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From notvalid2 at sbcglobal.net  Fri Feb 20 10:55:46 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 07:55:46 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <gnmivj$f78$1@ruby.cit.cornell.edu>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<gnmivj$f78$1@ruby.cit.cornell.edu>
Message-ID: <YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>

David Smith wrote:
> W. eWatson wrote:
>>> I'm not sure whether I should feel old or write a smart alec comment --
>>> I suppose there are people in the world who don't know what to do with a
>>> command prompt....
>>>
>>> Assuming a Windows system:
>>>
>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window (w/o
>>> the single quote characters)
>>> 3. Drag/drop the folder containing your python script to your command
>>> prompt window
>>> 4. Hit enter in your command prompt window.
>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>
>>> --David
>> If I enter just cd, then it tells me cd is not defined. If I enter
>> c:/python25, it tells me I have a syntax error at c in c:. The title of
>> the black background window I have up with a >>> prompt shown in it is
>> "Python(command line)". Maybe this isn't the real Python console window?
>>
>> What I want is that if I execute the program by double clicking on its
>> name to display the console window with the program or syntax errors
>> shown without it closing in a split second. Putting read_raw in it
>> doesn't work, since some error prevents it from ever being seen.
>>
> 
> What I meant was open open the command prompt, type cd, space, DO NOT
> hit enter yet.  Drag the folder with your script into the command prompt
> window.  Then go to the command prompt window and hit enter.  This
> should compose a command similar to the following:
> 
> C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
> Documents\My Project"
> 
> C:\Documents and Settings\user\My Documents\My Project> _
> 
> --David
Ah, I thought I'd be clever and do a copy on the path name in the address 
area at the top of the folder. That doesn't work. I'm quite surprised though 
that one can do the drag as you say. But, hey, it works. Thanks. I wonder 
what else non-DOS things can be done in it?

-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From robert.kern at gmail.com  Fri Feb 20 10:59:16 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 09:59:16 -0600
Subject: Matplotlib change xticks and retain xticks changing during zoom
In-Reply-To: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>
References: <c897a96b-cfef-415b-80c1-83fd14e57eb6@p2g2000prf.googlegroups.com>
Message-ID: <gnmk0k$b4j$1@ger.gmane.org>

You will probably get better help on the matplotlib mailing list:

   https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Fri Feb 20 10:59:52 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 09:59:52 -0600
Subject: matplotlib issue: cannot auto-scale X axis of plop properly
In-Reply-To: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>
References: <C5C345F3.866F%Brent.R.Nash@jpl.nasa.gov>
Message-ID: <gnmk1o$ao4$1@ger.gmane.org>

On 2009-02-19 19:22, Nash, Brent R wrote:
> Hey everyone,
>
> I'm fairly new to matplotlib, but have read through tons of the
> documentation today and have a decent understanding of it. All the
> auto-scaling, xlim, and x_bound stuff works fine for me with the
> examples, but as soon as I try to use it on my data, it's not working
> for me. I've attached a demo script, 2 input files of data, and a PNG
> showing the resulting chart I get. The numbers on my Y-axis range from
> 7656 to 59928 (a difference of 52272) and the numbers on my X-axis range
> from 1.22896144017e+12 to 1.22896155012e+12 (a difference of 109950).

You will probably get better help on the matplotlib mailing list:

   https://lists.sourceforge.net/lists/listinfo/matplotlib-users

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From luke.dunn at gmail.com  Fri Feb 20 11:01:25 2009
From: luke.dunn at gmail.com (Luke Dunn)
Date: Fri, 20 Feb 2009 16:01:25 +0000
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
Message-ID: <b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>

yes power towers are allowed

exponentiation, multiplication, division, addition and subtraction. Brackets
when necessary but length is sorted on number of digits not number of
operators plus digits.

I always try my homework myself first. in 38 years of life I've learned only
to do what i want, if I wanted everyone else to do my work for me I'd be a
management consultant !
On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com> wrote:

> I am teaching myself coding. No university or school, so i guess its
> homework if you like. i am interested in algorithms generally, after doing
> some of Project Euler. Of course my own learning process is best served by
> just getting on with it but sometimes you will do that while other times you
> might just choose to ask for help. if no one suggests then i will probably
> shelve it and come back to it myself when I'm fresh.
>
> no it's not a real world problem but my grounding is in math so i like pure
> stuff anyway. don't see how that is a problem, as a math person i accept the
> validity of pure research conducted just for curiosity and aesthetic
> satisfaction. it often finds an application later anyway
>
> Thanks for your helpful suggestion of trying other methods and i will do
> that in time. my motive was to share an interesting problem because a human
> of moderate math education can sit down with this and find minimal solutions
> easily but the intuition they use is quite subtle, hence the idea of
> converting the human heuristic into an algorithm became of interest, and
> particularly a recursive one. i find that the development of a piece of
> recursion usually comes as an 'aha', and since i hadn't had such a moment, i
> thought i'd turn the problem loose on the public. also i found no online
> reference to this problem so it seemed ripe for sharing.
>
>   On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org> wrote:
>
>> Trip Technician wrote:
>>
>>> anyone interested in looking at the following problem.
>>>
>>
>> if you can give me a good reason why this is not homework I'd love to hear
>> it...I just don't see how this is a real problem.
>>
>> we are trying to express numbers as minimal expressions using only the
>>> digits one two and three, with conventional arithmetic. so for
>>> instance
>>>
>>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>>>
>>> are both minimal, using 4 digits but
>>>
>>> 33 = ((3+2)*2+1)*3
>>>
>>> using 5 is not.
>>>
>>> I have tried coding a function to return the minimal representation
>>> for any integer, but haven't cracked it so far. The naive first
>>> attempt is to generate lots of random strings, eval() them and sort by
>>> size and value. this is inelegant and slow.
>>>
>>
>> Wow. Okay, what other ways have you tried so far? Or are you beating your
>> head against the "search the entire problem space" solution still?
>>
>> This problem smells a lot like factorisation, so I would think of it in
>> terms of wanting to reduce the target number using as few operations as
>> possible.
>>
>> If you allow exponentiation that's going to be your biggest hitter so you
>> know that the best you can do using 2 digits is n^n where n is the largest
>> digit you allow yourself.
>>
>> Are you going to allow things like n^n^n or not?
>>
>>  n
>>
>>
>>
>
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From http  Fri Feb 20 11:02:45 2009
From: http (Paul Rubin)
Date: 20 Feb 2009 08:02:45 -0800
Subject: code challenge: generate minimal expressions using only digits 1,
	2, 3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <7xljs1xfiy.fsf@ruckus.brouhaha.com>

Trip Technician <luke.dunn at gmail.com> writes:
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.

This sounds a little like a homework assignment, or maybe a challenge
you are trying to solve for yourself, rather than be given a complete
answer for.  Anyway, the basic idea is to enumerate the expression
trees with 1 digit, then 2 digits, then 3 digits, etc, and compute the
value expressed by each tree.


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 11:03:04 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 17:03:04 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <mailman.353.1235142977.11746.python-list@python.org>
References: <mailman.114.1234882494.11746.python-list@python.org>	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
Message-ID: <499ed41c$0$15309$426a74cc@news.free.fr>

Paddy O'Loughlin a ?crit :
> 2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>> Note that while you *can* do direct access to the implementation attribute
>> (here, '_A' for property 'A'), you don't *need* to so (and usually shouldn't
>> - unless you have a very compelling reason).
> 
> Interesting. Why shouldn't you?
> I haven't used the property() function

s/function/object/

> before and probably have no
> call to, but when you say "usually shouldn't", what is there against
> it?

The case is that the whole point of using a computed attribute is to 
perform some computation on the value. IOW, except for a couple corner 
cases, only the accessors should directly access the implementation(s) 
attributes(s).

And of course, like for any other GoldenRule(tm), it's not meant to be 
blindly followed. It's just that most of the times, going thru the 
accessors is really what you want - even from within the class code.


From cdsd at d.com  Fri Feb 20 11:12:00 2009
From: cdsd at d.com (ssd)
Date: Fri, 20 Feb 2009 17:12:00 +0100
Subject: Problem with lists.
Message-ID: <gnsdo4$mvc$2@aioe.org>


Hi,

In the following code, (in Python 2.5)
I was expecting to get in "b" variable the values  b: [[0, 0], [0, 1],[0,
2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]

My code:

a = ["",""]
b = []

for i in range (0,5):
    for j in range (0,5):
        a[0] = i
        a[1] = j
        print "a: " + str(a)
        b.append(a)

print "b: " + str(b)

what is worng in the code?

Thanks,
Bye,







From gagsl-py2 at yahoo.com.ar  Fri Feb 20 11:14:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 14:14:16 -0200
Subject: Keeping the Console Open with IDLE
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>
	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
	<N5Anl.14216$as4.3968@nlpi069.nbdc.sbc.com>
Message-ID: <op.upnrd2dlx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 13:37:06 -0200, W. eWatson <notvalid2 at sbcglobal.net>  
escribi?:
> Catherine Heathcote wrote:
>> W. eWatson wrote:

>>  Run the program from within the MS command line, not by double  
>> clicking it.
> Shirley, you jest? DOS? To do this? How ugly. I barely recall the DOS  
> commands. I get to drill my way down 4 levels of folders. What DOS cmd  
> allows one to list only folders?

After executing these two commands, pressing TAB will auto-complete  
matching filenames/directories:

reg add "HKLM\Software\Microsoft\Command Processor" /v CompletionChar /t  
REG_DWORD /d 9

reg add "HKLM\Software\Microsoft\Command Processor" /v PathCompletionChar  
/t REG_DWORD /d 9

(Overwrite the previous value, if exists). This is a global change and the  
logged on user must have administrative rights to modify the registry.  
Unprivileged users must use HKCU instead of HKLM.

-- 
Gabriel Genellina



From luke.dunn at gmail.com  Fri Feb 20 11:30:10 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 08:30:10 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<7xljs1xfiy.fsf@ruckus.brouhaha.com>
Message-ID: <aa7ab076-d72b-4db3-b522-b1a265fbc8ac@s20g2000yqh.googlegroups.com>

On 20 Feb, 16:02, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> Trip Technician <luke.d... at gmail.com> writes:
> > I have a dim intuition that it could be done with a very clever bit of
> > recursion, but the exact form so far eludes me.
>
> This sounds a little like a homework assignment, or maybe a challenge
> you are trying to solve for yourself, rather than be given a complete
> answer for. ?Anyway, the basic idea is to enumerate the expression
> trees with 1 digit, then 2 digits, then 3 digits, etc, and compute the
> value expressed by each tree.

Thanks will get onto it. It's just a challenge I set myself so hints
only are cool.


From luke.dunn at gmail.com  Fri Feb 20 11:32:55 2009
From: luke.dunn at gmail.com (Trip Technician)
Date: Fri, 20 Feb 2009 08:32:55 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<mailman.362.1235146456.11746.python-list@python.org>
Message-ID: <524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>

On 20 Feb, 15:39, Nigel Rantor <wig... at wiggly.org> wrote:
> Trip Technician wrote:
> > anyone interested in looking at the following problem.
>
> if you can give me a good reason why this is not homework I'd love to
> hear it...I just don't see how this is a real problem.
>
>
>
>
>
> > we are trying to express numbers as minimal expressions using only the
> > digits one two and three, with conventional arithmetic. so for
> > instance
>
> > 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> > are both minimal, using 4 digits but
>
> > 33 = ((3+2)*2+1)*3
>
> > using 5 is not.
>
> > I have tried coding a function to return the minimal representation
> > for any integer, but haven't cracked it so far. The naive first
> > attempt is to generate lots of random strings, eval() them and sort by
> > size and value. this is inelegant and slow.
>
> Wow. Okay, what other ways have you tried so far? Or are you beating
> your head against the "search the entire problem space" solution still?
>
> This problem smells a lot like factorisation, so I would think of it in
> terms of wanting to reduce the target number using as few operations as
> possible.
>
> If you allow exponentiation that's going to be your biggest hitter so
> you know that the best you can do using 2 digits is n^n where n is the
> largest digit you allow yourself.
>
> Are you going to allow things like n^n^n or not?
>
> ? ?n- Hide quoted text -
>
> - Show quoted text -

yes n^n^n would be fine. agree it is connected to factorisation.
building a tree of possible expressions is my next angle.


From digitig at gmail.com  Fri Feb 20 11:33:20 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 20 Feb 2009 16:33:20 +0000
Subject: get most common number in a list with tolerance
In-Reply-To: <499E6EC0.8090509@al.com.au>
References: <499E6EC0.8090509@al.com.au>
Message-ID: <aee48b3c0902200833t719feedaw4763081d597ce71e@mail.gmail.com>

2009/2/20 Astan Chee <astan.chee at al.com.au>:
> Hi,
> I have a list that has a bunch of numbers in it and I want to get the most
> common number that appears in the list. This is trivial because i can do a
> max on each unique number. What I want to do is to have a tolerance to say
> that each number is not quite unique and if the difference from other
> numbers is small, than it can be counted together. This is what I have to
> get the common number (taken from the internet somewhere):
>
> l = [10,30,20,20,11,12]
> d = {}
> tolerance = 5
> for elm in l:
>   d[elm] = d.get(elm, 0) + 1
> counts = [(j,i) for i,j in d.items()]
>
>
>
> This of course returns a list where each of them is unique
>
> [(1, 12), (1, 10), (1, 11), (2, 20), (1, 30)]
>
> but I am expecting a list that looks like this:
>
> [(3, 10), (2, 20), (1, 30)]

Why only the points 10, 20 and 30? what has happened to (3,11), for
example? (10, 11 and 12 are all within 11+/-5)

It seems you are trying to do one of two things. Either you are trying
to form a histogram with data bands +/-tolerance, or you are trying to
do something like kernel smoothing with a rectangular kernel.

What would you expect the output to be if the data set were
[10,30,20,20,11,12,13] and the tolerance were 2?

-- 
Tim Rowe


From andrew at acooke.org  Fri Feb 20 11:34:34 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 13:34:34 -0300 (CLST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <c5033fe7d216df6de36ed970947edf23.squirrel@localhost>


this is a neat problem.

here is what i would do: use generators that extend an input.  a stream
approach.  the initial input would be the numbers themselves.

[('1', 1),('2', 2),('3', 3)]

those are (expression, value) pairs

then an initial attempt at the next function would be to extend that list
with additions:

def additions(pairs):
  for (expr1, value1) in pairs:
    # first, pass through unchanged
    yield (expr1, value1)
    # then generate all possible additions
    for (expr2, value2) in pairs:
      yield ('%s+%s'%(value1, value2), value1 + value2))

this would give you:

[('1', 1),('2', 2),('3', 3), ('1+1', 2), ...]

(you may need to add parentheses to expressions to preserve meaning
correctly)

you could extend that with an extra loop over different operations.
(subtraction, multiplication, etc)

then you could repeat that as often as you want (eating its own tail, in a
sense, i think).  an infinite list is ok because these are generators.

then you could filter that to group expressions that give a certain value,
and find the shortest.

andrew



Trip Technician wrote:
> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From wiggly at wiggly.org  Fri Feb 20 11:38:18 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 16:38:18 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>	
	<499ECEAA.30103@wiggly.org>	
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
	<b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
Message-ID: <499EDC7A.80201@wiggly.org>

Luke Dunn wrote:
> yes power towers are allowed

right, okay, without coding it here's my thought.

factorise the numbers you have but only allowing primes that exist in 
your digit set.

then take that factorisation and turn any repeated runs of digits 
multiplied by themselves into power-towers

any remainder can then be created in other ways, starting with a way 
other than exponentiation that is able to create the largest number, 
i.e. multiplication, then addition...

I've not got time to put it into code right now  but it shouldn't be too 
hard...

e.g.

digits : 3, 2, 1

n : 10
10 = 2*5 - but we don't have 5...
10 = 3*3 + 1
10 = 3^2+1
3 digits

n : 27
27 = 3*3*3
27 = 3^3
2 digits

n : 33
33 = 3*3*3 + 6
33 = 3*3*3 + 3*2
33 = 3^3+3*2
4 digits

> exponentiation, multiplication, division, addition and subtraction. 
> Brackets when necessary but length is sorted on number of digits not 
> number of operators plus digits.
>  
> I always try my homework myself first. in 38 years of life I've 
> learned only to do what i want, if I wanted everyone else to do my work 
> for me I'd be a management consultant !
> On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com 
> <mailto:luke.dunn at gmail.com>> wrote:
> 
>     I am teaching myself coding. No university or school, so i guess its
>     homework if you like. i am interested in algorithms generally, after
>     doing some of Project Euler. Of course my own learning process is
>     best served by just getting on with it but sometimes you will do
>     that while other times you might just choose to ask for help. if no
>     one suggests then i will probably shelve it and come back to it
>     myself when I'm fresh.
>      
>     no it's not a real world problem but my grounding is in math so i
>     like pure stuff anyway. don't see how that is a problem, as a math
>     person i accept the validity of pure research conducted just for
>     curiosity and aesthetic satisfaction. it often finds an application
>     later anyway
>      
>     Thanks for your helpful suggestion of trying other methods and i
>     will do that in time. my motive was to share an interesting problem
>     because a human of moderate math education can sit down with this
>     and find minimal solutions easily but the intuition they use is
>     quite subtle, hence the idea of converting the human heuristic into
>     an algorithm became of interest, and particularly a recursive one. i
>     find that the development of a piece of recursion usually comes as
>     an 'aha', and since i hadn't had such a moment, i thought i'd turn
>     the problem loose on the public. also i found no online reference to
>     this problem so it seemed ripe for sharing.
> 
>     On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org
>     <mailto:wiggly at wiggly.org>> wrote:
> 
>         Trip Technician wrote:
> 
>             anyone interested in looking at the following problem.
> 
> 
>         if you can give me a good reason why this is not homework I'd
>         love to hear it...I just don't see how this is a real problem.
> 
> 
>             we are trying to express numbers as minimal expressions
>             using only the
>             digits one two and three, with conventional arithmetic. so for
>             instance
> 
>             33 = 2^(3+2)+1 = 3^3+(3*2)
> 
>             are both minimal, using 4 digits but
> 
>             33 = ((3+2)*2+1)*3
> 
>             using 5 is not.
> 
>             I have tried coding a function to return the minimal
>             representation
>             for any integer, but haven't cracked it so far. The naive first
>             attempt is to generate lots of random strings, eval() them
>             and sort by
>             size and value. this is inelegant and slow.
> 
> 
>         Wow. Okay, what other ways have you tried so far? Or are you
>         beating your head against the "search the entire problem space"
>         solution still?
> 
>         This problem smells a lot like factorisation, so I would think
>         of it in terms of wanting to reduce the target number using as
>         few operations as possible.
> 
>         If you allow exponentiation that's going to be your biggest
>         hitter so you know that the best you can do using 2 digits is
>         n^n where n is the largest digit you allow yourself.
> 
>         Are you going to allow things like n^n^n or not?
> 
>          n
> 
> 
> 
> 



From wiggly at wiggly.org  Fri Feb 20 11:41:45 2009
From: wiggly at wiggly.org (Nigel Rantor)
Date: Fri, 20 Feb 2009 16:41:45 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>	<mailman.362.1235146456.11746.python-list@python.org>
	<524396b0-cd08-4ac7-8789-fe52c6afa4f9@j1g2000yqi.googlegroups.com>
Message-ID: <499EDD49.80703@wiggly.org>

Trip Technician wrote:
> 
> yes n^n^n would be fine. agree it is connected to factorisation.
> building a tree of possible expressions is my next angle.

I think building trees of the possible expressions as a couple of other 
people have suggested is simply a more structured way of doing what 
you're currnetly doing.

Right now you're throwing darts at the problem space, and hoping that 
the next one point you hit will be a more optimal solution.

If you enumerate all the expression trees you are just ensuring you 
don't miss any solutions.

I think the algorithm/hueristic I just posted should get you to the 
answer quicker though...

   n


From yguan08 at gmail.com  Fri Feb 20 11:46:38 2009
From: yguan08 at gmail.com (Allen)
Date: Fri, 20 Feb 2009 08:46:38 -0800 (PST)
Subject: cx_oracle -- how to insert "&"
Message-ID: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>

I am using Python with cx_oracle to load an excel spreadsheet into an
Oracle table. There are lots of text on the spreadsheet that have "&"
in them which I want to keep in the table. But inserting those text
will fail. Is there a work around for this? I can filter out the
failed insert statements and in SQLPLUS set define off  to run those
statements, but it would be nice to insert "&" directly in PYTHON.

Allen


From jimzat at iname.com  Fri Feb 20 11:47:27 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 08:47:27 -0800 (PST)
Subject: Killing subservient threads
Message-ID: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>

I am trying to create an app which will have a main window from which
the user will launch other (children) windows.

When I launch the child window I start a new thread which periodically
polls another device and updates the child window accordingly.  When I
dismiss the child window the "polling" thread stays alive and then
crashes with an exception when trying to write to the now defunct
child window.

How can I handle this?  I want to either 1) have the destructor for
the child window kill the spawned thread or 2) catch the exception
within the "polling" thread and see that the child window is gone and
then commit suicide.

I am an experienced embedded C programmer but have VERY little
experience with GUI programming and no experience in the Micro$oft
programming world.



From patrick.oloughlin at gmail.com  Fri Feb 20 12:04:23 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 17:04:23 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499ed41c$0$15309$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
	<499ed41c$0$15309$426a74cc@news.free.fr>
Message-ID: <cc34a9320902200904i60a21134t6b98a6b1c12f0c90@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>> Interesting. Why shouldn't you?
>> I haven't used the property() function
>
> s/function/object/

Nice try, but what I wrote was what I intended to say:
http://docs.python.org/library/functions.html#property

For all I know I could have used property objects several times in modules :)

> The case is that the whole point of using a computed attribute is to perform
> some computation on the value. IOW, except for a couple corner cases, only
> the accessors should directly access the implementation(s) attributes(s).
>
> And of course, like for any other GoldenRule(tm), it's not meant to be
> blindly followed. It's just that most of the times, going thru the accessors
> is really what you want - even from within the class code.

Hmm, it doesn't seem to me like it's much of a big deal, for it to
described as anything like a "GoldenRule" or to advise against its
overuse.
You use it when its appropriate and don't use it when you it's not,
like any other feature.

Paddy


-- 
"Ray, when someone asks you if you're a god, you say YES!"


From google at mrabarnett.plus.com  Fri Feb 20 12:13:44 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 20 Feb 2009 17:13:44 +0000
Subject: Keeping the Console Open with IDLE
In-Reply-To: <Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>	<gnmabm$rah$1@ruby.cit.cornell.edu>	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>	<EIynl.37668$Sp5.26172@text.news.virginmedia.com>	<caznl.13278$D32.2@flpi146.ffdc.sbc.com>
	<Gkznl.37676$Sp5.7350@text.news.virginmedia.com>
Message-ID: <499EE4C8.4060104@mrabarnett.plus.com>

Catherine Heathcote wrote:
> W. eWatson wrote:
>> Catherine Heathcote wrote:
>>> W. eWatson wrote:
>>>>
>>>>>
>>>>> I'm not sure whether I should feel old or write a smart alec 
>>>>> comment --
>>>>> I suppose there are people in the world who don't know what to do 
>>>>> with a
>>>>> command prompt....
>>>>>
>>>>> Assuming a Windows system:
>>>>>
>>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>>> (w/o
>>>>> the single quote characters)
>>>>> 3. Drag/drop the folder containing your python script to your command
>>>>> prompt window
>>>>> 4. Hit enter in your command prompt window.
>>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>>
>>>>> --David
>>>> If I enter just cd, then it tells me cd is not defined. If I enter 
>>>> c:/python25, it tells me I have a syntax error at c in c:. The title 
>>>> of the black background window I have up with a >>> prompt shown in 
>>>> it is "Python(command line)". Maybe this isn't the real Python 
>>>> console window?
>>>>
>>>> What I want is that if I execute the program by double clicking on 
>>>> its name to display the console window with the program or syntax 
>>>> errors shown without it closing in a split second. Putting read_raw 
>>>> in it doesn't work, since some error prevents it from ever being seen.
>>>>
>>>
>>> you need to open a dos prompt before doing the steps above. Go to 
>>> start->run and hit "cmd" <enter> without the quotes.
>> Something is amiss here. There's the MS Command Prompt, which I'm 
>> looking at right now. Yes, it has cd, and so on. I'm also looking at 
>> the Python command line window. It allow one to run interactively.
>>
>> If I write a simple python program with just raw_input, by clicking on 
>> the file name, I get a window with the the title "\Python25\pythonexe" 
>> that shows the prompt. If I deliberately put a syntax error in the 
>> program, and run it by clicking the file, then A window appears and 
>> disappears so quickly that I have no idea what it said. How do I keep 
>> that window up?
>>
>> Which, if any, of these is the real Python console? What is the window 
>> called in the example I gave with raw_input?
>>
> 
> Run the program from within the MS command line, not by double clicking it.
> 
Or create a .bat file containing the commands to run the Python program,
ending with the command "pause", which will wait for you to press a key
when the program has quit.


From bing.liu at gmail.com  Fri Feb 20 12:14:52 2009
From: bing.liu at gmail.com (bing)
Date: Fri, 20 Feb 2009 09:14:52 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
Message-ID: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>

Hi, I have some simple python scripts, anyone knows how to run the
Python Scripts in C++?
Any code example would be really helpful and appreciated.


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 12:21:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 15:21:42 -0200
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
Message-ID: <op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 14:47:27 -0200, jimzat <jimzat at iname.com> escribi?:

> I am trying to create an app which will have a main window from which
> the user will launch other (children) windows.
>
> When I launch the child window I start a new thread which periodically
> polls another device and updates the child window accordingly.  When I
> dismiss the child window the "polling" thread stays alive and then
> crashes with an exception when trying to write to the now defunct
> child window.
>
> How can I handle this?  I want to either 1) have the destructor for
> the child window kill the spawned thread or 2) catch the exception
> within the "polling" thread and see that the child window is gone and
> then commit suicide.

1) make the child window set a flag in the thread (let's say, t.terminate  
= True). And make the polling thread check the flag periodically (you  
possibly already have a loop there - just break the loop when you detect  
that self.terminate became true)

2) catching an exception is as easy as enclosing the code in a try/except  
block. And "commit suicide" is just "exit from the run() method".

-- 
Gabriel Genellina



From koranthala at gmail.com  Fri Feb 20 12:22:36 2009
From: koranthala at gmail.com (koranthala)
Date: Fri, 20 Feb 2009 09:22:36 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
Message-ID: <eaeaa3de-bac1-44aa-a3dd-f35e3d63248a@b38g2000prf.googlegroups.com>

On Feb 20, 9:47?pm, jimzat <jim... at iname.com> wrote:
> I am trying to create an app which will have a main window from which
> the user will launch other (children) windows.
>
> When I launch the child window I start a new thread which periodically
> polls another device and updates the child window accordingly. ?When I
> dismiss the child window the "polling" thread stays alive and then
> crashes with an exception when trying to write to the now defunct
> child window.
>
> How can I handle this? ?I want to either 1) have the destructor for
> the child window kill the spawned thread or 2) catch the exception
> within the "polling" thread and see that the child window is gone and
> then commit suicide.
>
> I am an experienced embedded C programmer but have VERY little
> experience with GUI programming and no experience in the Micro$oft
> programming world.

thread.setDaemon(True)
Makes it a daemon thread which means that interpreter will not stay
alive if only that thread is alive.


From notvalid2 at sbcglobal.net  Fri Feb 20 12:26:37 2009
From: notvalid2 at sbcglobal.net (W. eWatson)
Date: Fri, 20 Feb 2009 09:26:37 -0800
Subject: Keeping the Console Open with IDLE
In-Reply-To: <YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>
References: <x_pnl.14206$as4.9364@nlpi069.nbdc.sbc.com>
	<54c56179-6f92-41e9-bad7-afa8b28d0671@l38g2000vba.googlegroups.com>
	<Ahxnl.12530$8_3.6430@flpi147.ffdc.sbc.com>
	<gnmabm$rah$1@ruby.cit.cornell.edu>
	<Zwynl.20816$Ws1.13364@nlpi064.nbdc.sbc.com>
	<gnmivj$f78$1@ruby.cit.cornell.edu>
	<YhAnl.13287$D32.23@flpi146.ffdc.sbc.com>
Message-ID: <rIBnl.7488$jZ1.4111@flpi144.ffdc.sbc.com>

W. eWatson wrote:
> David Smith wrote:
>> W. eWatson wrote:
>>>> I'm not sure whether I should feel old or write a smart alec comment --
>>>> I suppose there are people in the world who don't know what to do 
>>>> with a
>>>> command prompt....
>>>>
>>>> Assuming a Windows system:
>>>>
>>>> 2. Type 'cd ' (as in Change Directory) in the command prompt window 
>>>> (w/o
>>>> the single quote characters)
>>>> 3. Drag/drop the folder containing your python script to your command
>>>> prompt window
>>>> 4. Hit enter in your command prompt window.
>>>> 5. Type python my_script_name.py to execute my_script_name.py.
>>>>
>>>> --David
>>> If I enter just cd, then it tells me cd is not defined. If I enter
>>> c:/python25, it tells me I have a syntax error at c in c:. The title of
>>> the black background window I have up with a >>> prompt shown in it is
>>> "Python(command line)". Maybe this isn't the real Python console window?
>>>
>>> What I want is that if I execute the program by double clicking on its
>>> name to display the console window with the program or syntax errors
>>> shown without it closing in a split second. Putting read_raw in it
>>> doesn't work, since some error prevents it from ever being seen.
>>>
>>
>> What I meant was open open the command prompt, type cd, space, DO NOT
>> hit enter yet.  Drag the folder with your script into the command prompt
>> window.  Then go to the command prompt window and hit enter.  This
>> should compose a command similar to the following:
>>
>> C:\Documents and Settings\user> cd "C:\Documents and Settings\user\My
>> Documents\My Project"
>>
>> C:\Documents and Settings\user\My Documents\My Project> _
>>
>> --David
> Ah, I thought I'd be clever and do a copy on the path name in the 
> address area at the top of the folder. That doesn't work. I'm quite 
> surprised though that one can do the drag as you say. But, hey, it 
> works. Thanks. I wonder what else non-DOS things can be done in it?
> 
Well, there is a difficulty with this method. The path is very long, and one 
must change the property width of the window. However, putting the name of a 
long py file further complicates this.

The negative surprise here is that I'm trying to avoid executing the program 
in IDLE, because I'm told elsewhere it produced erroneous error msgs. They 
are exactly the same here. I'll take this up on another thread.



-- 
                                W. eWatson

              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
               Obz Site:  39? 15' 7" N, 121? 2' 32" W, 2700 feet

                     Web Page: <www.speckledwithstars.net/>



From gagsl-py2 at yahoo.com.ar  Fri Feb 20 12:28:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 15:28:02 -0200
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
Message-ID: <op.upnus0mxx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 15:14:52 -0200, bing <bing.liu at gmail.com> escribi?:

> Hi, I have some simple python scripts, anyone knows how to run the
> Python Scripts in C++?
> Any code example would be really helpful and appreciated.

Do you want to write a C++ application, and allow your users to write  
scripts in Python, possibly exposing some objects from you application?

Yes: read the "Extending and Embedding" document, specially the "Embedding  
part" (last)
<http://docs.python.org/extending/index.html>

No: please explain in more detail what you want to do.

-- 
Gabriel Genellina



From lists at cheimes.de  Fri Feb 20 12:30:43 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 18:30:43 +0100
Subject: Killing subservient threads
In-Reply-To: <op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<op.upnuigk7x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnmpc3$ul2$1@ger.gmane.org>

Gabriel Genellina wrote:
> 1) make the child window set a flag in the thread (let's say,
> t.terminate = True). And make the polling thread check the flag
> periodically (you possibly already have a loop there - just break the
> loop when you detect that self.terminate became true)

threading.Condition() and threading.Event() are especially designed for
the job. Please use them appropriately.

Christian



From marc.wyburn at googlemail.com  Fri Feb 20 12:33:13 2009
From: marc.wyburn at googlemail.com (marc wyburn)
Date: Fri, 20 Feb 2009 09:33:13 -0800 (PST)
Subject: pymssql text type
Message-ID: <851ed9db-2561-48ad-b54c-95f96a7fa42d@q9g2000yqc.googlegroups.com>

Hi, I'm trying to pass a text blob to MS SQL Express 2008 but get the
follwoing error.

(<class 'pymssql.OperationalError'>, OperationalError("SQL Server
message 102, severity 15, state 1, line 1:\nIncorrect syntax near
'assigned'.\n",), <traceback object at 0x044ABDF0>)

the string it is having an issue with is

(\r\n\r\n\tLogon ID:\t\t(0x0,0xE892A8)\r\n\r\n\tLogon Type:\t2\r\n\r
\n')

It looks like SQL is reading the blob, finding the newline codes and
generating an error.  Is there anyway I can get it to ignore the text
and just enter the whole sentance as a string.  I think that some
automatic character encodign might be taking place hence the string is
being read but I can work out whether I need to character encode in
Python, change a table setting in SQL or do something to pymssql.

Thanks, Marc.


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 20 12:38:27 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 20 Feb 2009 18:38:27 +0100
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <mailman.368.1235149466.11746.python-list@python.org>
References: <mailman.114.1234882494.11746.python-list@python.org>	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>	<499eaa34$0$21372$426a74cc@news.free.fr>	<mailman.353.1235142977.11746.python-list@python.org>	<499ed41c$0$15309$426a74cc@news.free.fr>
	<mailman.368.1235149466.11746.python-list@python.org>
Message-ID: <499eea77$0$4840$426a74cc@news.free.fr>

Paddy O'Loughlin a ?crit :
> 2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
>>> Interesting. Why shouldn't you?
>>> I haven't used the property() function
>> s/function/object/
> 
> Nice try, but what I wrote was what I intended to say:
> http://docs.python.org/library/functions.html#property

Check by yourself:

 >>> import inspect
 >>> inspect.isfunction(property)
False
 >>> property()
<property object at 0xb7cbc144>
 >>> dir(property)
['__class__', '__delattr__', '__delete__', '__doc__', '__get__', 
'__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', 
'__reduce_ex__', '__repr__', '__set__', '__setattr__', '__str__', 
'fdel', 'fget', 'fset']
 >>>


>> The case is that the whole point of using a computed attribute is to perform
>> some computation on the value. IOW, except for a couple corner cases, only
>> the accessors should directly access the implementation(s) attributes(s).
>>
>> And of course, like for any other GoldenRule(tm), it's not meant to be
>> blindly followed. It's just that most of the times, going thru the accessors
>> is really what you want - even from within the class code.
> 
> Hmm, it doesn't seem to me like it's much of a big deal, for it to
> described as anything like a "GoldenRule"

One could say the same for each and any of the usual GoldenRules(tm).


From bing.liu at gmail.com  Fri Feb 20 12:47:06 2009
From: bing.liu at gmail.com (david)
Date: Fri, 20 Feb 2009 09:47:06 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
Message-ID: <3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>

>
> No: please explain in more detail what you want to do.
>
> --
> Gabriel Genellina

Thanks for the fast reply Gabriel,
Basically I have some python scripts to do some document processing,
all in command line tho.
I want to have an C++ application so that my scripts can run in dialogs
(API).
I saw a post before using c# to run python scripts within the c# main.
I am willing to run my python scripts within c++.
Thanks.


From thorsten at thorstenkampe.de  Fri Feb 20 12:54:11 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Fri, 20 Feb 2009 18:54:11 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <MPG.24090cad6756ba449897c5@news.individual.de>

* Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
> mu at the beginning (it's pronounced micro-wiki). 

No, it's not. I suggest you start your Unicode adventure by configuring 
your newsreader.

Thorsten


From aahz at pythoncraft.com  Fri Feb 20 13:07:15 2009
From: aahz at pythoncraft.com (Aahz)
Date: 20 Feb 2009 10:07:15 -0800
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <gnmrgj$ltv$1@panix3.panix.com>

In article <pan.2009.02.10.21.58.36 at REMOVE.THIS.cybersource.com.au>,
Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>
>As I understand it, there's very little benefit to multi-cores in Python 
>due to the GIL. 

As phrased, your statement is completely wrong.  Here's a more correct
phrasing: "For threaded compute-bound applications written in pure
Python, there's very little benefit to multiple cores."  But threaded
I/O-bound applications do receive some benefit from multiple cores, and
using multiple processes certainly leverages multiple cores.  If boosting
the performance of a threaded compute-bound application is important, one
can always write the critical parts in C/C++.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From google at mrabarnett.plus.com  Fri Feb 20 13:08:18 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 20 Feb 2009 18:08:18 +0000
Subject: To unicode or not to unicode
In-Reply-To: <MPG.24090cad6756ba449897c5@news.individual.de>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
Message-ID: <499EF192.5010300@mrabarnett.plus.com>

Thorsten Kampe wrote:
> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
>> I'm writing a little wiki that I call ?Wiki.  That's a lowercase Greek 
>> mu at the beginning (it's pronounced micro-wiki). 
> 
> No, it's not. I suggest you start your Unicode adventure by configuring 
> your newsreader.
> 
It looked like mu to me, but you're correct: it's "MICRO SIGN", not
"GREEK SMALL LETTER MU".


From jimzat at iname.com  Fri Feb 20 13:11:39 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 10:11:39 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<eaeaa3de-bac1-44aa-a3dd-f35e3d63248a@b38g2000prf.googlegroups.com>
Message-ID: <5ca84e48-07a1-426f-b3c9-580c8dc7f151@k19g2000prh.googlegroups.com>

On Feb 20, 11:22?am, koranthala <koranth... at gmail.com> wrote:
>
> thread.setDaemon(True)
> Makes it a daemon thread which means that interpreter will not stay
> alive if only that thread is alive.

My main window is used to launch multiple children and therefore when
one is dismissed the interpreter will remain active.


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 13:12:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 20 Feb 2009 16:12:17 -0200
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
	<3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>
Message-ID: <op.upnwurvzx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 15:47:06 -0200, david <bing.liu at gmail.com> escribi?:

> Basically I have some python scripts to do some document processing,
> all in command line tho.
> I want to have an C++ application so that my scripts can run in dialogs
> (API).
> I saw a post before using c# to run python scripts within the c# main.
> I am willing to run my python scripts within c++.
> Thanks.

So you want to execute a Python script, in a different process, as if you  
typed the command line?
That's not different to executing any other external program in C# - in  
fact is a C# question, no Python involved. Try something like this:

     Process p = new Process();
     p.StartInfo.FileName = "path\to\python.exe";
     p.StartInfo.Arguments = "path\to\your\script.py other arguments";
     p.Start();
     p.WaitForExit();
     p.Close()

There are other properties you may want to use, like  
RedirectStandardOutput; see the C# documentation.

-- 
Gabriel Genellina



From jimzat at iname.com  Fri Feb 20 13:15:10 2009
From: jimzat at iname.com (jimzat)
Date: Fri, 20 Feb 2009 10:15:10 -0800 (PST)
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<mailman.370.1235150534.11746.python-list@python.org>
Message-ID: <df56c9b4-5d0b-45c8-9e50-52c2e6c181c5@d2g2000pra.googlegroups.com>

On Feb 20, 11:21?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> 1) make the child window set a flag in the thread (let's say, t.terminate ?
> = True). And make the polling thread check the flag periodically (you ?
> possibly already have a loop there - just break the loop when you detect ?
> that self.terminate became true)
>
> 2) catching an exception is as easy as enclosing the code in a try/except ?
> block. And "commit suicide" is just "exit from the run() method".

Gabriel,

I am using the thread module and calling thread.start_new_thread
(...).  If I use t=thread.start_new_thread(...) and later set
t.terminate, I get "AttributeError: 'int' object has no attribute
'terminate'"

What is the proper way to do this?  I don't want to use globals as I
will have multiple child windows of various classes.




From bing.liu at gmail.com  Fri Feb 20 13:16:08 2009
From: bing.liu at gmail.com (david)
Date: Fri, 20 Feb 2009 10:16:08 -0800 (PST)
Subject: How Can I run some Python Scripts in VS C++?
References: <a91599a2-28b3-4241-9623-8abcbe44a419@g38g2000yqd.googlegroups.com>
	<mailman.371.1235150909.11746.python-list@python.org>
	<3305aa6f-7f1d-4103-9bf0-42c1a0d81c4f@v15g2000yqn.googlegroups.com>
	<mailman.374.1235153565.11746.python-list@python.org>
Message-ID: <074c3462-a7da-4426-bcdd-387f9eb19811@x9g2000yqk.googlegroups.com>

On Feb 20, 11:12?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 20 Feb 2009 15:47:06 -0200, david <bing.... at gmail.com> escribi?:
>
> > Basically I have some python scripts to do some document processing,
> > all in command line tho.
> > I want to have an C++ application so that my scripts can run in dialogs
> > (API).
> > I saw a post before using c# to run python scripts within the c# main.
> > I am willing to run my python scripts within c++.
> > Thanks.
>
> So you want to execute a Python script, in a different process, as if you ?
> typed the command line?
> That's not different to executing any other external program in C# - in ?
> fact is a C# question, no Python involved. Try something like this:
>
> ? ? ?Process p = new Process();
> ? ? ?p.StartInfo.FileName = "path\to\python.exe";
> ? ? ?p.StartInfo.Arguments = "path\to\your\script.py other arguments";
> ? ? ?p.Start();
> ? ? ?p.WaitForExit();
> ? ? ?p.Close()
>
> There are other properties you may want to use, like ?
> RedirectStandardOutput; see the C# documentation.
>
> --
> Gabriel Genellina

Thanks so much. I'll give it a try :)
Best Regards.

David


From tim.wintle at teamrubber.com  Fri Feb 20 13:22:27 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 20 Feb 2009 18:22:27 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <499EDC7A.80201@wiggly.org>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<499ECEAA.30103@wiggly.org>
	<b3dc476d0902200752v760e2361yd14dc48e7157df45@mail.gmail.com>
	<b3dc476d0902200801h6d23db8bxa6c1a00f0f1be8f7@mail.gmail.com>
	<499EDC7A.80201@wiggly.org>
Message-ID: <1235154147.8441.31.camel@tim-laptop>

On Fri, 2009-02-20 at 16:38 +0000, Nigel Rantor wrote:
> Luke Dunn wrote:

<snip>

That was my initial thought when I read this too - but I'm not certain
that is guaranteed to find a solution (i.e. a solution that's optimal).

I'd welcome a proof that it will though, a few minutes thought hasn't
found a counter-example.

> > yes power towers are allowed
> 
> right, okay, without coding it here's my thought.
> 
> factorise the numbers you have but only allowing primes that exist in 
> your digit set.
> 
> then take that factorisation and turn any repeated runs of digits 
> multiplied by themselves into power-towers
> 
> any remainder can then be created in other ways, starting with a way 
> other than exponentiation that is able to create the largest number, 
> i.e. multiplication, then addition...
> 
> I've not got time to put it into code right now  but it shouldn't be too 
> hard...
> 
> e.g.
> 
> digits : 3, 2, 1
> 
> n : 10
> 10 = 2*5 - but we don't have 5...
> 10 = 3*3 + 1
> 10 = 3^2+1
> 3 digits
> 
> n : 27
> 27 = 3*3*3
> 27 = 3^3
> 2 digits
> 
> n : 33
> 33 = 3*3*3 + 6
> 33 = 3*3*3 + 3*2
> 33 = 3^3+3*2
> 4 digits
> 
> > exponentiation, multiplication, division, addition and subtraction. 
> > Brackets when necessary but length is sorted on number of digits not 
> > number of operators plus digits.
> >  
> > I always try my homework myself first. in 38 years of life I've 
> > learned only to do what i want, if I wanted everyone else to do my work 
> > for me I'd be a management consultant !
> > On Fri, Feb 20, 2009 at 3:52 PM, Luke Dunn <luke.dunn at gmail.com 
> > <mailto:luke.dunn at gmail.com>> wrote:
> > 
> >     I am teaching myself coding. No university or school, so i guess its
> >     homework if you like. i am interested in algorithms generally, after
> >     doing some of Project Euler. Of course my own learning process is
> >     best served by just getting on with it but sometimes you will do
> >     that while other times you might just choose to ask for help. if no
> >     one suggests then i will probably shelve it and come back to it
> >     myself when I'm fresh.
> >      
> >     no it's not a real world problem but my grounding is in math so i
> >     like pure stuff anyway. don't see how that is a problem, as a math
> >     person i accept the validity of pure research conducted just for
> >     curiosity and aesthetic satisfaction. it often finds an application
> >     later anyway
> >      
> >     Thanks for your helpful suggestion of trying other methods and i
> >     will do that in time. my motive was to share an interesting problem
> >     because a human of moderate math education can sit down with this
> >     and find minimal solutions easily but the intuition they use is
> >     quite subtle, hence the idea of converting the human heuristic into
> >     an algorithm became of interest, and particularly a recursive one. i
> >     find that the development of a piece of recursion usually comes as
> >     an 'aha', and since i hadn't had such a moment, i thought i'd turn
> >     the problem loose on the public. also i found no online reference to
> >     this problem so it seemed ripe for sharing.
> > 
> >     On Fri, Feb 20, 2009 at 3:39 PM, Nigel Rantor <wiggly at wiggly.org
> >     <mailto:wiggly at wiggly.org>> wrote:
> > 
> >         Trip Technician wrote:
> > 
> >             anyone interested in looking at the following problem.
> > 
> > 
> >         if you can give me a good reason why this is not homework I'd
> >         love to hear it...I just don't see how this is a real problem.
> > 
> > 
> >             we are trying to express numbers as minimal expressions
> >             using only the
> >             digits one two and three, with conventional arithmetic. so for
> >             instance
> > 
> >             33 = 2^(3+2)+1 = 3^3+(3*2)
> > 
> >             are both minimal, using 4 digits but
> > 
> >             33 = ((3+2)*2+1)*3
> > 
> >             using 5 is not.
> > 
> >             I have tried coding a function to return the minimal
> >             representation
> >             for any integer, but haven't cracked it so far. The naive first
> >             attempt is to generate lots of random strings, eval() them
> >             and sort by
> >             size and value. this is inelegant and slow.
> > 
> > 
> >         Wow. Okay, what other ways have you tried so far? Or are you
> >         beating your head against the "search the entire problem space"
> >         solution still?
> > 
> >         This problem smells a lot like factorisation, so I would think
> >         of it in terms of wanting to reduce the target number using as
> >         few operations as possible.
> > 
> >         If you allow exponentiation that's going to be your biggest
> >         hitter so you know that the best you can do using 2 digits is
> >         n^n where n is the largest digit you allow yourself.
> > 
> >         Are you going to allow things like n^n^n or not?
> > 
> >          n
> > 
> > 
> > 
> > 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list



From aisaac at american.edu  Fri Feb 20 13:27:33 2009
From: aisaac at american.edu (Alan Isaac)
Date: Fri, 20 Feb 2009 18:27:33 GMT
Subject: is it possible to add a property to an instance?
In-Reply-To: <g64mbt$ssa$1@ruby.cit.cornell.edu>
References: <g64jda$nr1$1@ruby.cit.cornell.edu>
	<2dda482a-d15c-4f8d-9fca-3bfffe9e4fa1@f63g2000hsf.googlegroups.com>
	<g64mbt$ssa$1@ruby.cit.cornell.edu>
Message-ID: <pCCnl.598$Ez6.203@nwrddc02.gnilink.net>

Darren Dale wrote to GHUM:
> Sorry, that's an attribute, not a property.


This is a question about terminology.
In contrast to Darren's recommended usage,
I have run into the following.

If hasattr(x,'a') is True, for instance object `x`,
then `a` is an attribute of `x`.
Attributes are data attributes or callable attributes.
Data attributes are variables or properties.
Callable attributes are usually method attributes.

This seemed about right to me, but a better
(or "official") taxonomy would be welcome.

Thanks,
Alan Isaac


From aaron.hildebrandt at gmail.com  Fri Feb 20 13:28:34 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 10:28:34 -0800 (PST)
Subject: Find the location of a loaded module
Message-ID: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>

I'm running into a problem that's rapidly reaching keyboard-smashing
levels. I'm trying to import a module into Python, but it seems like
Python is almost randomly loading the module from an entirely
different directory, one that shouldn't be in the module search path.

When I tell Python to load a module, is there a way to tell which
directory the module was loaded from?


From lists at cheimes.de  Fri Feb 20 13:39:51 2009
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 20 Feb 2009 19:39:51 +0100
Subject: Find the location of a loaded module
In-Reply-To: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
Message-ID: <gnmtdn$eca$1@ger.gmane.org>

Aaron Scott schrieb:
> I'm running into a problem that's rapidly reaching keyboard-smashing
> levels. I'm trying to import a module into Python, but it seems like
> Python is almost randomly loading the module from an entirely
> different directory, one that shouldn't be in the module search path.
> 
> When I tell Python to load a module, is there a way to tell which
> directory the module was loaded from?

All except builtin modules have an attribute __file__ that points to the
file.

Christian



From patrick.oloughlin at gmail.com  Fri Feb 20 13:45:16 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 20 Feb 2009 18:45:16 +0000
Subject: How do I declare global vars or class vars in Python ?
In-Reply-To: <499eea77$0$4840$426a74cc@news.free.fr>
References: <mailman.114.1234882494.11746.python-list@python.org>
	<slrngpt2j0.hhb.nick@irishsea.home.craig-wood.com>
	<499eaa34$0$21372$426a74cc@news.free.fr>
	<mailman.353.1235142977.11746.python-list@python.org>
	<499ed41c$0$15309$426a74cc@news.free.fr>
	<mailman.368.1235149466.11746.python-list@python.org>
	<499eea77$0$4840$426a74cc@news.free.fr>
Message-ID: <cc34a9320902201045p32f2c418w884de263ca67cf95@mail.gmail.com>

2009/2/20 Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid>:
> Check by yourself:
>
>>>> import inspect
>>>> inspect.isfunction(property)
> False
Using this, every single builtin function returns False. That's a
pretty limited definition to be being pedantic over, especially when
they are in the "Built-in Functions" section of the manual.

>>>> property()
> <property object at 0xb7cbc144>
I never said that calling it didn't return a property object :)

>>> property
<type 'property'>

So it's a type.
I think I didn't make such a bad error on my part. My intent in what I
was saying was to indicate that I hadn't created a property type. It's
fair enough to consider type constructors as functions given how they
are listed as such by the python documentation.
I don't think that your correction was much help, unless you just want
to say that everything is an object. Maybe you'd be right, but it's
not much use to use the term that way, imo

<shrug>

>>>> dir(property)
> ['__class__', '__delattr__', '__delete__', '__doc__', '__get__',
> '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__',
> '__reduce_ex__', '__repr__', '__set__', '__setattr__', '__str__', 'fdel',
> 'fget', 'fset']

Doesn't prove a whole lot. So types have attributes...
So do functions:
>>> def myfunc():
...     pass
...
>>> dir(myfunc)
['__call__', '__class__', '__delattr__', '__dict__', '__doc__',
'__get__', '__getattribute__', '__hash__', '__init__', '__module__',
'__name__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
'__setattr__', '__str__', 'func_closure', 'func_code',
'func_defaults', 'func_dict', 'func_doc', 'func_globals', 'func_name']


>> Hmm, it doesn't seem to me like it's much of a big deal, for it to
>> described as anything like a "GoldenRule"
>
> One could say the same for each and any of the usual GoldenRules(tm).
Not really. To do so would be over-generalising and not useful to discussion
I guess it's your pedantry that I'm questioning.
Something like "don't use goto's" works as a GoldenRule because it's
been observed that without it, people start using goto statements in
places where it's not really appropriate.
When you said that "[you] usually shouldn't [use properties] - unless
you have a very compelling reason", your tone implied that properties
are easy to misuse and tend to be.
Not being familiar with properties and seeing them as being pretty
harmless, I was intrigued by this, which is why I asked for an
explanation.
Your explanation seems to show that your tone was likely to be more
personal bias than any real issue with properties.

Paddy

-- 
"Ray, when someone asks you if you're a god, you say YES!"


From aisaac at american.edu  Fri Feb 20 13:49:21 2009
From: aisaac at american.edu (Alan Isaac)
Date: Fri, 20 Feb 2009 18:49:21 GMT
Subject: function factory question: embed current values of object attributes
Message-ID: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>

I have a class `X` where many parameters are set
at instance initialization.  The parameter values
of an instance `x` generally remain unchanged,
but is there way to communicate to a method that
it depends only on the initial values of these parameters
(and does not need to worry about any changes)?

The behavior of method `m` depends on these parameter values.
It turns out `m` gets called a lot, which means
that the pameter values are accessed over and over
(self.p0, self.p1, etc).  I would like to
manufacture a function equivalent to the method
that simply uses fixed values (the values at the
time it is manufactured).  I do not care if this
function is attached to `x` or not.

I have a feeling that I am turning something simple
into something complex, perhaps for lack of an
afternoon coffee or lack of CS training.  Suggestions
appreciated.

Alan Isaac


From aaron.hildebrandt at gmail.com  Fri Feb 20 13:53:58 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 10:53:58 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
Message-ID: <a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com>

Okay, I'm going out of my mind. I have three directories -- 'act1',
'act2', and 'act3'. Each of these has a module named 'story'.

Through mod_python, I need to load 'story' in the directory 'act1'. I
do it like this:

	req.content_type = "text/html"
	sys.path.append(os.path.dirname( __file__ ))
	req.write(str(sys.path))
	import story
	req.write(story.game.Save())
	sys.path.pop()

According to sys.path, these are Python's paths:

['/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/python2.5/
plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/python2.5/lib-
dynload', '/usr/lib/python2.5/site-packages', '/usr/local/python2.5.2/
lib/python2.5/', '/home/www/---/docs/act1']

story.game.Save() returns the location of the story.game module, which
is reported as '/home/www/---/docs/act1/story/game.pyc'. So far so
good.

Now, I'll try the same thing from the 'act2' directory. These are the
paths reported in sys.path:

['/usr/lib/python25.zip', '/usr/lib/python2.5', '/usr/lib/python2.5/
plat-linux2', '/usr/lib/python2.5/lib-tk', '/usr/lib/python2.5/lib-
dynload', '/usr/lib/python2.5/site-packages', '/usr/local/python2.5.2/
lib/python2.5/', '/home/www/---/docs/act2']

All good, right? Not so fast. Here's what story.game.Save() returns as
its location: '/home/www/---/docs/act1/story/game.pyc'.

Which means it's loading the 'story' module from the old location,
even though that location is no longer in the path.

If I refresh a couple times, eventually it loads the module from the
proper directory ('act2'). Then, I'll go back to the first directory,
and find that it too will be loading the module from 'act2'. I'll
refresh, and it'll load from 'act1' again. I'll refresh a couple
times, and suddenly it's loading from 'act2' again.

I'm seriously going insane. If anyone has any insight, please, please
share it with me.

Aaron


From umarpy at googlemail.com  Fri Feb 20 14:11:11 2009
From: umarpy at googlemail.com (umarpy at googlemail.com)
Date: Fri, 20 Feb 2009 11:11:11 -0800 (PST)
Subject: Regular expression bug?
References: <rNOSPAMon-77389A.10550119022009@news.gha.chartermi.net> 
	<gnkdal$bcq$01$1@news.t-online.com>
	<rNOSPAMon-A7A006.13035919022009@news.gha.chartermi.net> 
	<mailman.346.1235135052.11746.python-list@python.org>
Message-ID: <18ff6125-1b25-48ff-b6c5-8accec79b69d@u38g2000yqe.googlegroups.com>


More elegant way

>>> [x for x in re.split('([A-Z]+[a-z]+)', a) if x ]
['foo', 'Bar', 'Baz']

R.

On Feb 20, 2:03?pm, Lie Ryan <lie.1... at gmail.com> wrote:
> On Thu, 19 Feb 2009 13:03:59 -0800, Ron Garret wrote:
> > In article <gnkdal$bcq$0... at news.t-online.com>,
> > ?Peter Otten <__pete... at web.de> wrote:
>
> >> Ron Garret wrote:
>
> >> > I'm trying to split a CamelCase string into its constituent
> >> > components.
>
> >> How about
>
> >> >>> re.compile("[A-Za-z][a-z]*").findall("fooBarBaz")
> >> ['foo', 'Bar', 'Baz']
>
> > That's very clever. ?Thanks!
>
> >> > (BTW, I tried looking at the source code for the re module, but I
> >> > could not find the relevant code. ?re.split calls
> >> > sre_compile.compile().split, but the string 'split' does not appear
> >> > in sre_compile.py. ?So where does this method come from?)
>
> >> It's coded in C. The source is Modules/sremodule.c.
>
> > Ah. ?Thanks!
>
> > rg
>
> This re.split() doesn't consume character:
>
> >>> re.split('([A-Z][a-z]*)', 'fooBarBaz')
>
> ['foo', 'Bar', '', 'Baz', '']
>
> it does what the OP wants, albeit with extra blank strings.



From invalid at invalid  Fri Feb 20 14:20:48 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 20 Feb 2009 13:20:48 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
Message-ID: <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>

On 2009-02-20, Aahz <aahz at pythoncraft.com> wrote:
> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>
>> As I understand it, there's very little benefit to multi-cores
>> in Python due to the GIL. 
>
> As phrased, your statement is completely wrong.  Here's a more
> correct phrasing: "For threaded compute-bound applications
> written in pure Python, there's very little benefit to
> multiple cores." But threaded I/O-bound applications do
> receive some benefit from multiple cores, and using multiple
> processes certainly leverages multiple cores.  If boosting the
> performance of a threaded compute-bound application is
> important, one can always write the critical parts in C/C++.

Do the crunchy bits of scipy/numpy, scientific python, vtk and
other compute-intensive libraries tend to release the GIL while
they're busy "computing"?

[Perhaps using them doesn't count as "pure Python", but...]

-- 
Grant Edwards                   grante             Yow! NEWARK has been
                                  at               REZONED!!  DES MOINES has
                               visi.com            been REZONED!!


From rNOSPAMon at flownet.com  Fri Feb 20 14:21:02 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 11:21:02 -0800
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
Message-ID: <rNOSPAMon-71D951.11210220022009@news.gha.chartermi.net>

In article <mailman.373.1235153296.11746.python-list at python.org>,
 MRAB <google at mrabarnett.plus.com> wrote:

> Thorsten Kampe wrote:
> > * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> >> I'm writing a little wiki that I call ??Wiki.  That's a lowercase Greek 
> >> mu at the beginning (it's pronounced micro-wiki). 
> > 
> > No, it's not. I suggest you start your Unicode adventure by configuring 
> > your newsreader.
> > 
> It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> "GREEK SMALL LETTER MU".

Heh, I didn't know that those two things were distinct.  Learn something 
new every day.

rg


From rNOSPAMon at flownet.com  Fri Feb 20 14:48:45 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 11:48:45 -0800
Subject: What encoding does u'...' syntax use?
Message-ID: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>

I would have thought that the answer would be: the default encoding 
(duh!)  But empirically this appears not to be the case:

>>> unicode('\xb5')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
ordinal not in range(128)
>>> u'\xb5'
u'\xb5'
>>> print u'\xb5'
?

(That last character shows up as a micron sign despite the fact that my 
default encoding is ascii, so it seems to me that that unicode string 
must somehow have picked up a latin-1 encoding.)

rg


From martin at v.loewis.de  Fri Feb 20 15:05:04 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Fri, 20 Feb 2009 21:05:04 +0100
Subject: To unicode or not to unicode
In-Reply-To: <mailman.373.1235153296.11746.python-list@python.org>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
Message-ID: <499F0CF0.8070800@v.loewis.de>

MRAB wrote:
> Thorsten Kampe wrote:
>> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
>>> I'm writing a little wiki that I call ?Wiki.  That's a lowercase
>>> Greek mu at the beginning (it's pronounced micro-wiki). 
>>
>> No, it's not. I suggest you start your Unicode adventure by
>> configuring your newsreader.
>>
> It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> "GREEK SMALL LETTER MU".

I don't think that was the complaint. Instead, the complaint was
that the OP's original message did not have a Content-type header,
and that it was thus impossible to tell what the byte in front of
"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
MU in a usenet or email message, you really must use MIME. (As both
your article and Thorsten's did, by choosing UTF-8)

Regards,
Martin

P.S. The difference between MICRO SIGN and GREEK SMALL LETTER MU
is nit-picking, IMO:

py> unicodedata.name(unicodedata.normalize("NFKC", u"\N{MICRO SIGN}"))
'GREEK SMALL LETTER MU'


From rNOSPAMon at flownet.com  Fri Feb 20 15:19:13 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 12:19:13 -0800
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
Message-ID: <rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>

In article <499F0CF0.8070800 at v.loewis.de>,
 "Martin v. L??wis" <martin at v.loewis.de> wrote:

> MRAB wrote:
> > Thorsten Kampe wrote:
> >> * Ron Garret (Thu, 19 Feb 2009 18:57:13 -0800)
> >>> I'm writing a little wiki that I call ??Wiki.  That's a lowercase
> >>> Greek mu at the beginning (it's pronounced micro-wiki). 
> >>
> >> No, it's not. I suggest you start your Unicode adventure by
> >> configuring your newsreader.
> >>
> > It looked like mu to me, but you're correct: it's "MICRO SIGN", not
> > "GREEK SMALL LETTER MU".
> 
> I don't think that was the complaint. Instead, the complaint was
> that the OP's original message did not have a Content-type header,

I'm the OP.  I'm using MT-Newswatcher 3.5.1.  I thought I had it 
configured properly, but I guess I didn't.  Under 
Preferences->Languages->Send Messages with Encoding I had selected 
latin-1.  I didn't know I also needed to have MIME turned on for that to 
work.  I've turned it on now.  Is this better?

This should be a micro sign: ??

rg


From aaron.hildebrandt at gmail.com  Fri Feb 20 15:23:03 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 12:23:03 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com>
Message-ID: <1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com>

Here's another clue: if I'm trying to run the script from the
directory 'act1', but it's loading the module from 'act2', if I rename
the module directory in 'act2' and refresh, the module still reports
that it's running from '/home/www/---/docs/act2/story/game.pyc'...
even though that files no longer exists. If I refresh a few more
times, both 'act1' and 'act2' will load the module from 'act1's
directory (even though the directory doesn't appear in sys.path when
you try to load it from 'act2').

So, Python is trying to import a module from a directory that isn't in
sys.path, and will generally default to running the module from the
directory where it was last run. If I run it from 'act1', then 'act2',
both times it will load the module from 'act1'. If I do it the other
way around, it will load the module from 'act2' both times.

The question now is... why is it loading from a directory that isn't
in sys.path? How can I avoid this?


From rushenaly at gmail.com  Fri Feb 20 15:35:58 2009
From: rushenaly at gmail.com (rushenaly at gmail.com)
Date: Fri, 20 Feb 2009 12:35:58 -0800 (PST)
Subject: Will multithreading make python less popular?
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com> 
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com> 
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com> 
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com> 
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com> 
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<52a0375d-4fad-4caa-8328-47b8f30f2395@40g2000prx.googlegroups.com>
	<db48c751-fb63-4867-bcce-6664a19afb10@z1g2000yqn.googlegroups.com> 
	<be4c6e60-518d-42e5-972a-ad0b91c4e22a@a12g2000yqm.googlegroups.com>
Message-ID: <c7cf2312-db2f-41fc-b523-e764007e43df@v15g2000yqn.googlegroups.com>

I want to correct my last post where i said that there is not any
intend to remove GIL from python. There is an intend actually i wish
from a wizard :).
On the pypy blog there is an explanation about gil and pypy
"Note that multithreading in PyPy is based on a global interpreter
lock, as in CPython. I imagine that we will get rid of the global
interpreter lock at some point in the future -- I can certainly see
how this might be done in PyPy, unlike in CPython -- but it will be a
lot of work nevertheless. Given our current priorities, it will
probably not occur soon unless someone steps in."
Nothing new about GIL and Cpython and even PyPy

Thank you...
Rushen

Thank you...


From martin at v.loewis.de  Fri Feb 20 15:41:18 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 20 Feb 2009 21:41:18 +0100
Subject: To unicode or not to unicode
In-Reply-To: <rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
	<rNOSPAMon-894ABB.12191320022009@news.gha.chartermi.net>
Message-ID: <499F156E.3030902@v.loewis.de>

Ron Garret wrote:
> In article <499F0CF0.8070800 at v.loewis.de>,
>  "Martin v. L??wis" <martin at v.loewis.de> wrote:
> 
> 
> I'm the OP.  I'm using MT-Newswatcher 3.5.1.  I thought I had it 
> configured properly, but I guess I didn't.

Probably you did. However, it then means that the newsreader is crap.

> Under 
> Preferences->Languages->Send Messages with Encoding I had selected 
> latin-1.

That sounds like early nineties, before the invention of MIME.

> I didn't know I also needed to have MIME turned on for that to 
> work.  I've turned it on now.  Is this better?
> 
> This should be a micro sign: ??

Not really (it's worse, from my point of view - but might be better
for others). You are now sending in UTF-8, but there is still no
MIME declaration in the news headers. As a consequence, my newsreader
continues to interpret it as Latin-1 (which it assumes as the default
encoding), and it comes out as moji-bake (in responding, my reader
should declare the encoding properly, so you should see what I see,
namely A-circumflex, micro sign)

If you look at the message headers / message source as sent e.g.
by MRAB, you'll notice lines like

MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

These lines are missing from your posting.

Assuming the newsreader is not crap, it might help to set the default
send encoding to ASCII. When sending micro sign, the newsreader might
infer that ASCII is not good enough, and use MIME - although it then
still needs to pick an encoding.

Regards,
Martin


From nad at acm.org  Fri Feb 20 15:48:46 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 20 Feb 2009 12:48:46 -0800
Subject: Framework installation of 2.6 on OS X, with specified prefix
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
Message-ID: <nad-2C4315.12484620022009@news.gmane.org>

In article <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F at gmail.com>,
 Evert Rol <evert.rol at gmail.com> wrote:
> I'm trying to install Python 2.6 from source on Mac OS X.5, in its own  
> directory using a framework install. That goes fine, up to the point  
> where it wants to install the applications that come with it (eg, the  
> Wish shell): it tries to install things into /Applications, instead of  
> eg <prefix>/Applications.
> Here's my configure line (the flags are there just to let it find my  
> own installed readline):
> 
> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw -- 
> enable-shared --enable-framework=/sw/Library/Frameworks --with- 
> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
> 
> 
> And the last part of the output of 'make install':
> 
> ../python.exe ./scripts/BuildApplet.py \
> 		--destroot "" \
> 		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/ 
> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/ 
> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/ 
> MacOS/Python-32" && echo "-32"`  \
> 		--output "/sw/Applications/Python 2.6/Build Applet.app" \
> 		./scripts/BuildApplet.py
> cd PythonLauncher && make install DESTDIR=
> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python  
> 2.6"
> mkdir: /Applications/Python 2.6: Permission denied
> make[2]: *** [install] Error 1
> make[1]: *** [install_PythonLauncher] Error 2
> make: *** [frameworkinstallapps] Error 2
> 
> Is there an option on the configure line that I need to set, or  
> something in setup.py? Or perhaps hack the Makefile?

FWIW, the OS X build-installer.py script handles this by specifying a 
DESTDIR on the make install steps rather than including a --prefix on 
the configure.   See Mac/BuildScript/build-installer.py.

-- 
 Ned Deily,
 nad at acm.org



From stefan_ml at behnel.de  Fri Feb 20 15:55:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 20 Feb 2009 21:55:25 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
Message-ID: <499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>

Ron Garret wrote:
> I would have thought that the answer would be: the default encoding 
> (duh!)  But empirically this appears not to be the case:
> 
>>>> unicode('\xb5')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> ordinal not in range(128)
>>>> u'\xb5'
> u'\xb5'
>>>> print u'\xb5'
> ?
> 
> (That last character shows up as a micron sign despite the fact that my 
> default encoding is ascii, so it seems to me that that unicode string 
> must somehow have picked up a latin-1 encoding.)

You are mixing up console output and internal data representation. What you
see in the last line is what the Python interpreter makes of your unicode
string when passing it into stdout, which in your case seems to use a
latin-1 encoding (check your environment settings for that).

BTW, Unicode is not an encoding. Wikipedia will tell you more.

Stefan


From stefan_ml at behnel.de  Fri Feb 20 15:58:59 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 20 Feb 2009 21:58:59 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <499f1993$0$31879$9b4e6d93@newsspool3.arcor-online.net>

Stefan Behnel wrote:
>>>>> print u'\xb5'
>> ?
> 
> What you
> see in the last line is what the Python interpreter makes of your unicode
> string when passing it into stdout, which in your case seems to use a
> latin-1 encoding (check your environment settings for that).

The "seems to" is misleading. The example doesn't actually tell you
anything about the encoding used by your console, except that it can
display non-ASCII characters.

Stefan


From dotancohen at gmail.com  Fri Feb 20 16:09:13 2009
From: dotancohen at gmail.com (Dotan Cohen)
Date: Fri, 20 Feb 2009 23:09:13 +0200
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
Message-ID: <880dece00902201309i1a12bd79qc79aa06b58f11176@mail.gmail.com>

> Even 3DS or Maya is easier to learn that Blender.
>

Notepad is easier to learn that VI. Not a good program does simple make.

-- 
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-??-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?-?
?-?-?-?-?-?-?

From rNOSPAMon at flownet.com  Fri Feb 20 16:15:51 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 13:15:51 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>

In article <499f18bd$0$31879$9b4e6d93 at newsspool3.arcor-online.net>,
 Stefan Behnel <stefan_ml at behnel.de> wrote:

> Ron Garret wrote:
> > I would have thought that the answer would be: the default encoding 
> > (duh!)  But empirically this appears not to be the case:
> > 
> >>>> unicode('\xb5')
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> > UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> > ordinal not in range(128)
> >>>> u'\xb5'
> > u'\xb5'
> >>>> print u'\xb5'
> > ?
> > 
> > (That last character shows up as a micron sign despite the fact that my 
> > default encoding is ascii, so it seems to me that that unicode string 
> > must somehow have picked up a latin-1 encoding.)
> 
> You are mixing up console output and internal data representation. What you
> see in the last line is what the Python interpreter makes of your unicode
> string when passing it into stdout, which in your case seems to use a
> latin-1 encoding (check your environment settings for that).
> 
> BTW, Unicode is not an encoding. Wikipedia will tell you more.

Yes, I know that.  But every concrete representation of a unicode string 
has to have an encoding associated with it, including unicode strings 
produced by the Python parser when it parses the ascii string "u'\xb5'"

My question is: what is that encoding?  It can't be ascii.  So what is 
it?

Put this another way: I would have thought that when the Python parser 
parses "u'\xb5'" it would produce the same result as calling 
unicode('\xb5'), but it doesn't.  Instead it seems to produce the same 
result as calling unicode('\xb5', 'latin-1').  But my default encoding 
is not latin-1, it's ascii.  So where is the Python parser getting its 
encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
calling unicode('\xb5')?

rg


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:16:26 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:16:26 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com> 
	<1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com>
Message-ID: <28aba044-d927-499b-8bd2-525870ae0267@j1g2000yqi.googlegroups.com>

And more madness...

Executed from inside 'act1', which contains the directory / module
'story':


	directory = os.path.dirname(__file__)
	req.write(str(directory))
	story = apache.import_module('story', path=[directory])


Results:


  File "/home/www/---/docs/act1/play.py", line 24, in Rebuild
    storylab = apache.import_module('story', path=[directory])

  File "/usr/local/python2.5.2/lib/python2.5/site-packages/mod_python/
importer.py", line 304, in import_module
    return __import__(module_name, {}, {}, ['*'])

ImportError: No module named story


Awesome. I'm going to go stick my head through a wall.


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:24:00 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:24:00 -0800 (PST)
Subject: Find the location of a loaded module
References: <73f87180-7a68-4d50-952d-e966a3932690@s9g2000prg.googlegroups.com>
	<a34830f4-7bf0-4122-84f7-4114c7fd4661@o2g2000prl.googlegroups.com> 
	<1d94d39d-1795-4111-b567-3263c1da569f@d32g2000yqe.googlegroups.com> 
	<28aba044-d927-499b-8bd2-525870ae0267@j1g2000yqi.googlegroups.com>
Message-ID: <e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com>

Son of a bitch. It gets worse.

> Executed from inside 'act1', which contains the directory / module
> 'story':
>
> ? ? ? ? directory = os.path.dirname(__file__)
> ? ? ? ? req.write(str(directory))
> ? ? ? ? story = apache.import_module('story', path=[directory])
>
> Results:
>
>   /home/www/---/docs/act1
>
> ? File "/home/www/---/docs/act1/play.py", line 24, in Rebuild
> ? ? storylab = apache.import_module('story', path=[directory])
>
> ? File "/usr/local/python2.5.2/lib/python2.5/site-packages/mod_python/
> importer.py", line 304, in import_module
> ? ? return __import__(module_name, {}, {}, ['*'])
>
> ImportError: No module named story
>

If I execute the exact same code from the 'act1' directory after
running it from the 'act2' directory, it successfully loads the
'story' module... from 'act2'. Even though I used the Apache importer
to specify the EXACT LOCATION of the module to import.

'req.write(str(os.path.dirname(__file__)))' returns '/home/www/---/
docs/act1'.

'req.write(story.game.Save())' returns '/home/www/--/docs/act2/
storylab/game.pyc' as the file being accessed.

BLOODY HELL.

Okay, deep breath.

Does anyone know what's going on? Am I just not understanding how
module importing in mod_python works? I'd really appreciate help,
since I'll be stuck at work today until I can get this sorted out, and
I've long since run out of ideas.


From aaron.hildebrandt at gmail.com  Fri Feb 20 16:24:52 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 13:24:52 -0800 (PST)
Subject: Find the location of a loaded module
References: e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com
Message-ID: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>

>
> 'req.write(story.game.Save())' returns '/home/www/--/docs/act2/
> storylab/game.pyc' as the file being accessed.
>

Sorry, that should have read:
> 'req.write(story.game.Save())' returns '/home/www/--/docs/act2/story/game.pyc' as the file being accessed.


From tjreedy at udel.edu  Fri Feb 20 16:26:55 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 16:26:55 -0500
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
Message-ID: <gnn770$g43$1@ger.gmane.org>

Alan Isaac wrote:
> I have a class `X` where many parameters are set
> at instance initialization.  The parameter values
> of an instance `x` generally remain unchanged,

'Parameters' are the function local names in the header that get bound 
to argument objects when the function is called.  What you are 
describing are 'attributes'.

> but is there way to communicate to a method that
> it depends only on the initial values of these parameters
> (and does not need to worry about any changes)?

In the terms stated, no.

> The behavior of method `m` depends on these parameter values.
> It turns out `m` gets called a lot, which means
> that the pameter values are accessed over and over
> (self.p0, self.p1, etc).  I would like to
> manufacture a function equivalent to the method
> that simply uses fixed values (the values at the
> time it is manufactured).

You are now describing a function closure.  Here is an example that 
might help.

def f_maker(a1, a2):
   def _(b): return a1*b + a2
   return _

class C:
   def __init__(self, attr1, attr2):
     self.attr1 = attr1
     self.attr2 = attr2
     self.f = f_maker(attr1, attr2)

c = C(2,3)
print(*(c.f(i) for i in range(5)))

# 3 5 7 9 11

Having f use both initial and 'current' attribute values would be a bit 
trickier ;-)

Terry Jan Reedy



From tjreedy at udel.edu  Fri Feb 20 16:35:47 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 16:35:47 -0500
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
Message-ID: <gnn7nk$hqq$1@ger.gmane.org>

Ron Garret wrote:
> I would have thought that the answer would be: the default encoding 
> (duh!)  But empirically this appears not to be the case:
> 
>>>> unicode('\xb5')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xb5 in position 0: 
> ordinal not in range(128)

The unicode function is usually used to decode bytes read from *external 
sources*, each of which can have its own encoding.  So the function 
(actually, developer crew) refuses to guess and uses the ascii common 
subset.

>>>> u'\xb5'
> u'\xb5'
>>>> print u'\xb5'
> ?

Unicode literals are *in the source file*, which can only have one 
encoding (for a given source file).

> (That last character shows up as a micron sign despite the fact that my 
> default encoding is ascii, so it seems to me that that unicode string 
> must somehow have picked up a latin-1 encoding.)

I think latin-1 was the default without a coding cookie line.  (May be 
uft-8 in 3.0).



From robert.kern at gmail.com  Fri Feb 20 16:52:02 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 20 Feb 2009 15:52:02 -0600
Subject: can multi-core improve single funciton?
In-Reply-To: <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>	<mailman.9220.1234269815.3487.python-list@python.org>	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
Message-ID: <gnn8m2$kfm$1@ger.gmane.org>

On 2009-02-20 13:20, Unknown wrote:
> On 2009-02-20, Aahz<aahz at pythoncraft.com>  wrote:
>> Steven D'Aprano<steven at REMOVE.THIS.cybersource.com.au>  wrote:
>>
>>> As I understand it, there's very little benefit to multi-cores
>>> in Python due to the GIL.
>> As phrased, your statement is completely wrong.  Here's a more
>> correct phrasing: "For threaded compute-bound applications
>> written in pure Python, there's very little benefit to
>> multiple cores." But threaded I/O-bound applications do
>> receive some benefit from multiple cores, and using multiple
>> processes certainly leverages multiple cores.  If boosting the
>> performance of a threaded compute-bound application is
>> important, one can always write the critical parts in C/C++.
>
> Do the crunchy bits of scipy/numpy, scientific python, vtk and
> other compute-intensive libraries tend to release the GIL while
> they're busy "computing"?

Often. Not as often as they could, sometimes.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Fri Feb 20 17:09:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 17:09:19 -0500
Subject: cx_oracle -- how to insert "&"
In-Reply-To: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>
References: <1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com>
Message-ID: <gnn9mj$m3o$1@ger.gmane.org>

Allen wrote:
> I am using Python with cx_oracle to load an excel spreadsheet into an
> Oracle table. There are lots of text on the spreadsheet that have "&"
> in them which I want to keep in the table. But inserting those text
> will fail.

Why do you say that?

> Is there a work around for this? I can filter out the
> failed insert statements and in SQLPLUS set define off  to run those
> statements, but it would be nice to insert "&" directly in PYTHON.
> 
regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Fri Feb 20 17:18:13 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 19:18:13 -0300 (CLST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
Message-ID: <ed02bed307df1596d6c516fb3fe9525f.squirrel@localhost>

from subsequent posts i think you were looking for something "smarter"
than my streams, but i was interested in the idea, so i wrote an
implementation.  hope this is ok - if you don't want to see a worked
solution, read no further...

i have been using generators a lot recently; now that i understand them
better i really like the "laziness" they give.  this code is perhaps more
like you would see in haskell than in python...

some results from the code as below:

 -725 = (((1)+(1))+((1)+(1)))-(((1)+(2))^((2)*(3)))  (length 8)
...
   -2 = (1)-(3)               (length 2)
   -1 = (1)-(2)               (length 2)
    0 = (1)-(1)               (length 2)
    1 = 1                     (length 1)
    2 = 2                     (length 1)
    3 = 3                     (length 1)
    4 = (1)+(3)               (length 2)
...
  972 = (((1)+(1))+((1)+(1)))*(((1)+(2))^((2)+(3)))  (length 8)

note that because this is a brute-force search it is limited in the number
of combinations it considers (for a given "take", below), and not at all
"smart" (in preferring pow over other values for example), so the extreme
values are nothing like optimal (the final invocation, commented out, uses
sorting to improve things).

also, complex and float values are generated; i discard those with a
filter, but you can drop that if you are curious.


#!/usr/bin/python3

'''
See
http://groups.google.com/group/comp.lang.python/browse_thread/thread/b387f99deb376392

This is a brute force approach using streams, implemented
with generators.
'''

from operator import add, sub, mul, truediv as div, pow


OPERATORS = [('+', add), ('-', sub), ('*', mul),
             ('/', div), ('^', pow)]
START = [(str(i), 1, i) for i in [1,2,3]]


def all_operators(stream):
    '''
    Generate new values by combining the values in 'stream' in
    all the different ways possible.
    '''
    for (exprn, length, value) in stream:
        for (symbol, op) in OPERATORS:
            for (exprn2, length2, value2) in stream:
                try:
                    yield ('({0}){1}({2})'.format(
                            exprn, symbol, exprn2),
                           length + length2,
                           op(value, value2))
                except Exception as e:
#                    print('Ignoring {}',format(e))
                    pass


def repeat(generator, preproc=lambda x: x):
    '''
    Make a generator 'eat its own tail', primed with 'start'.
    All output is kept and fed back into the generator as input.   Note
that memory use increases steadily.
    '''
    def repeater(start):
        start = preproc(start)
        for value in start:
            yield value
        while True:
            finish = []
            for value in generator(start):
                yield value
                finish.append(value)
            start = finish
    return repeater



def value(elv):
    '''
    Pick the value from an elv triplet.
    '''
    (exprn, length, value) = elv
    return value


def take(n):
    '''
    Build a filter that takes the first n values from a stream.
    '''
    def taker(stream, n=n):
        while n > 0:
            yield next(stream)
            n -= 1
    return taker


def mkfilter(predicate):
    '''
    Curry Python's filter function.
    '''
    def myfilter(stream):
        return filter(lambda elv: predicate(value(elv)), stream)
    return myfilter


def compose(*filters):
    '''
    Compose several filters to give a new filter.
    (Is there a better way to write this?)
    '''
    def composer(iter1, iter2):
        def composed(stream):
            for value in iter1(iter2(stream)):
                yield value
        return composed
    if len(filters) == 1:
        return filters[0]
    else:
        return composer(filters[0], compose(*filters[1:]))


def summarise(stream):
    '''
    Group values by value, keeping the shortest expression,
    then print everything.
    '''
    exprns = {}
    lengths = {}
    for (exprn, length, value) in stream:
        if value not in exprns or length < lengths[value]:
            exprns[value] = exprn
            lengths[value] = length
    values = [value for value in exprns if type(value) is int]
    for value in sorted(values):
        print('{0:>5} = {1:20}  (length {2})'.format(
                value, exprns[value], lengths[value]))


if __name__ == '__main__':
    ints = mkfilter(lambda x: type(x) is int)
    small = mkfilter(lambda x: abs(x) < 1000)
    # this gets very slow after 20000 values
#    summarise(compose(take(20000),
#                      repeat(compose(ints,
#                                     all_operators)))(START))
    # clipping values to below 1000 makes things much faster
    # note 200,000 below, 20,000 above!
    summarise(compose(take(200000),
                      repeat(compose(ints, small,
                                     all_operators)))(START))
    # get to larger values faster by sorting in the repeat
#    sort = lambda x: sorted(x, key=value, reverse=True)
#    summarise(compose(take(200000),
#                      repeat(compose(ints, small,
#                                     all_operators),
#                             preproc=sort))(START))



andrew cooke wrote:
>
> this is a neat problem.
>
> here is what i would do: use generators that extend an input.  a stream
approach.  the initial input would be the numbers themselves.
>
> [('1', 1),('2', 2),('3', 3)]
>
> those are (expression, value) pairs
>
> then an initial attempt at the next function would be to extend that
list
> with additions:
>
> def additions(pairs):
>   for (expr1, value1) in pairs:
>     # first, pass through unchanged
>     yield (expr1, value1)
>     # then generate all possible additions
>     for (expr2, value2) in pairs:
>       yield ('%s+%s'%(value1, value2), value1 + value2))
>
> this would give you:
>
> [('1', 1),('2', 2),('3', 3), ('1+1', 2), ...]
>
> (you may need to add parentheses to expressions to preserve meaning
correctly)
>
> you could extend that with an extra loop over different operations.
(subtraction, multiplication, etc)
>
> then you could repeat that as often as you want (eating its own tail, in
a
> sense, i think).  an infinite list is ok because these are generators.
>
> then you could filter that to group expressions that give a certain
value,
> and find the shortest.
>
> andrew
>
>
>
> Trip Technician wrote:
>> anyone interested in looking at the following problem.
>> we are trying to express numbers as minimal expressions using only the
digits one two and three, with conventional arithmetic. so for
>> instance
>> 33 = 2^(3+2)+1 = 3^3+(3*2)
>> are both minimal, using 4 digits but
>> 33 = ((3+2)*2+1)*3
>> using 5 is not.
>> I have tried coding a function to return the minimal representation for
any integer, but haven't cracked it so far. The naive first attempt is
to generate lots of random strings, eval() them and sort by size and
value. this is inelegant and slow.
>> I have a dim intuition that it could be done with a very clever bit of
recursion, but the exact form so far eludes me.
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>






From invalid at invalid  Fri Feb 20 17:27:19 2009
From: invalid at invalid (Grant Edwards)
Date: Fri, 20 Feb 2009 16:27:19 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
	<mailman.382.1235166735.11746.python-list@python.org>
Message-ID: <btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>

On 2009-02-20, Robert Kern <robert.kern at gmail.com> wrote:
>
>> Do the crunchy bits of scipy/numpy, scientific python, vtk and
>> other compute-intensive libraries tend to release the GIL
>> while they're busy "computing"?
>
> Often. Not as often as they could, sometimes.

On one hand, the upshot of that is that by finding an
appropriate library module you might gain some of the same
benefits as removing the GIL.

On the other hand, that doesn't help if you're doing something
original enough that nobody has written a library to handle
large chunks of it.

And on the grasping hand, I find that most of us vastly
overestimate the originality of what we're doing.

-- 
Grant Edwards                   grante             Yow! This is a NO-FRILLS
                                  at               flight -- hold th' CANADIAN
                               visi.com            BACON!!


From callen314 at gmail.com  Fri Feb 20 17:34:51 2009
From: callen314 at gmail.com (Craig Allen)
Date: Fri, 20 Feb 2009 14:34:51 -0800 (PST)
Subject: Threading and tkinter
References: <492d5db9-3681-4ae8-827e-f2a4f66bee80@v39g2000yqm.googlegroups.com>
	<F9SdnWgld5-sMgHUnZ2dnUVZ_j-WnZ2d@pdx.net>
	<6ef2c1d5-d742-4d4c-b1b6-2e685b9ff758@c12g2000yqj.googlegroups.com>
	<mailman.222.1235010024.11746.python-list@python.org>
Message-ID: <3c42278a-9748-4f12-a876-da5802a55785@e18g2000yqo.googlegroups.com>


> The statement
>
> ? ? x=x+1
>
> (which, by the way, should stylistically be written
>
> ? ? x = x + 1
>

yes I was wondering what "x=x+1" meant until you translated it... oh,
"x = x + 1" of course! I thought to myself.

Oh wait no I'm sarcastic.


From dg.gmane at thesamovar.net  Fri Feb 20 17:37:04 2009
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Fri, 20 Feb 2009 23:37:04 +0100
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <gnnbai$s7v$1@ger.gmane.org>

This sounds kind of similar to a problem I posted to this list last 
year, you might find that thread gives you some ideas:

http://mail.python.org/pipermail/python-list/2008-January/474071.html

Dan



From matthew at woodcraft.me.uk  Fri Feb 20 17:43:13 2009
From: matthew at woodcraft.me.uk (Matthew Woodcraft)
Date: Fri, 20 Feb 2009 22:43:13 GMT
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
Message-ID: <87ab8gu3um.fsf@golux.woodcraft.me.uk>

Ron Garret <rNOSPAMon at flownet.com> writes:
> Put this another way: I would have thought that when the Python parser
> parses "u'\xb5'" it would produce the same result as calling
> unicode('\xb5'), but it doesn't. Instead it seems to produce the same
> result as calling unicode('\xb5', 'latin-1'). But my default encoding
> is not latin-1, it's ascii. So where is the Python parser getting its
> encoding from? Why does parsing "u'\xb5'" not produce the same error
> as calling unicode('\xb5')?

There is no encoding involved other than ascii, only processing of a
backslash escape.

The backslash escape '\xb5' is converted to the unicode character whose
ordinal number is B5h. This gives the same result as
"\xb5".decode("latin-1") because the unicode numbering is the same as
the 'latin-1' numbering in that range.

-M-


From aaron.hildebrandt at gmail.com  Fri Feb 20 17:44:21 2009
From: aaron.hildebrandt at gmail.com (Aaron Scott)
Date: Fri, 20 Feb 2009 14:44:21 -0800 (PST)
Subject: Find the location of a loaded module
References: e0b3b363-c14d-4708-99e7-60101a00bbfe@h5g2000yqh.googlegroups.com 
	<e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
Message-ID: <5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>

And finally, an epilogue.

So, the problem lies with how Python cached the modules in memory.
Yes, the modules were in two different locations and yes, the one that
I specified using its direct path should be the one loaded. The
problem is, the module isn't always loaded -- if it's already in
memory, it'll use that instead. And since the modules had the same
name, Python wouldn't distinguish between them, even though they
weren't exactly the same. So, loading the module act1/story would load
act1/story. Then, loading the module act2/story would use the story
module already in memory. Of course, this made the problem hard to
pinpoint, since memory is a fickle thing, and the results weren't
always reproducible.

The final solution? Renaming the 'story' modules to 'story_1' and
'story_2'... and importing them via 'exec("from story_"+modulename+"
import game")'.

Will I go to hell for this 'solution'? Probably. But hey, it means I
can go home tonight instead of spending all evening at the office
hitting my head against the wall. I'll come back to it Monday and try
to figure out a more reasonable solution.


From martin at v.loewis.de  Fri Feb 20 18:15:08 2009
From: martin at v.loewis.de (=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 21 Feb 2009 00:15:08 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
Message-ID: <499F397C.7030404@v.loewis.de>

> Yes, I know that.  But every concrete representation of a unicode string 
> has to have an encoding associated with it, including unicode strings 
> produced by the Python parser when it parses the ascii string "u'\xb5'"
> 
> My question is: what is that encoding?

The internal representation is either UTF-16, or UTF-32; which one is
a compile-time choice (i.e. when the Python interpreter is built).

> Put this another way: I would have thought that when the Python parser 
> parses "u'\xb5'" it would produce the same result as calling 
> unicode('\xb5'), but it doesn't.

Right. In the former case, \xb5 denotes a Unicode character, namely
U+00B5, MICRO SIGN. It is the same as u"\u00b5", and still the same
as u"\N{MICRO SIGN}". By "the same", I mean "the very same".

OTOH, unicode('\xb5') is something entirely different. '\xb5' is a
byte string with length 1, with a single byte with the numeric
value 0xb5, or 181. It does not, per se, denote any specific character.
It only gets a character meaning when you try to decode it to unicode,
which you do with unicode('\xb5'). This is short for

  unicode('\xb5', sys.getdefaultencoding())

and sys.getdefaultencoding() is (or should be) "ascii". Now, in
ASCII, byte 0xb5 does not have a meaning (i.e. it does not denote
a character at all), hence you get a UnicodeError.

> Instead it seems to produce the same 
> result as calling unicode('\xb5', 'latin-1').

Sure. However, this is only by coincidence, because latin-1 has the same
code points as Unicode (for 0..255).

> But my default encoding 
> is not latin-1, it's ascii.  So where is the Python parser getting its 
> encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
> calling unicode('\xb5')?

Because \xb5 *directly* refers to character U+00b5, with no
byte-oriented encoding in-between.

Regards,
Martin


From brianlong at cox.net  Fri Feb 20 18:15:31 2009
From: brianlong at cox.net (brianrpsgt1)
Date: Fri, 20 Feb 2009 15:15:31 -0800 (PST)
Subject: count secton of data in list
Message-ID: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>

I have a list of three columns of data.  I run the following code:

def step1(val):
    for d1r in data1_row:
        if d1r[1] >= val:
            switch = 0
            data2_row = d1r[0],d1r[1],d1r[2],switch
            print d1r[0],d1r[1],d1r[2],switch
        else:
            switch = 1
            print d1r[0],d1r[1],d1r[2],switch

step1(95)

After running that code I get four columns with either a '0' or '1' in
the 4th column, as shown below

2009-01-09 13:17:30 96 123456 0
2009-01-09 13:17:31 95 123456 0
2009-01-09 13:17:32 95 123456 0
2009-01-09 13:17:33 95 123456 0
2009-01-09 13:17:34 94 123456 1
2009-01-09 13:17:35 94 123456 1
2009-01-09 13:17:36 94 123456 1
2009-01-09 13:17:37 94 123456 1
2009-01-09 13:17:38 94 123456 1
2009-01-09 13:17:39 94 123456 1
2009-01-09 13:17:40 94 123456 1
2009-01-09 13:17:41 94 123456 1
2009-01-09 13:17:42 95 123456 0
2009-01-09 13:17:43 95 123456 0
2009-01-09 13:17:44 95 123456 0
2009-01-09 13:17:45 95 123456 0

Where I am getting stuck is that I now need to get the individual
counts for the various consecutive areas in the list where the values
are '1'.  I was trying to run a FOR Loop on the variable data2_row....
but that does not work.  Any assistance would be great.

Thanks:
B



From Scott.Daniels at Acm.Org  Fri Feb 20 18:15:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 20 Feb 2009 15:15:42 -0800
Subject: Implementaion of random.shuffle
In-Reply-To: <pan.2007.07.19.03.47.01.146316@REMOVE.THIS.cybersource.com.au>
References: <4e8b75a40707160510h25773f3ch749492cba2dc733@mail.gmail.com>
	<mailman.752.1184590453.22759.python-list@python.org>
	<87d4ys9z46.fsf@mulj.homelinux.net>
	<pan.2007.07.17.02.51.13@REMOVE.THIS.cybersource.com.au>
	<1184787155.773575.303080@d30g2000prg.googlegroups.com>
	<pan.2007.07.19.03.47.01.146316@REMOVE.THIS.cybersource.com.au>
Message-ID: <AK2dnf30VP6QpALUnZ2dnUVZ_oninZ2d@pdx.net>

Steven D'Aprano wrote:
> On Wed, 18 Jul 2007 19:32:35 +0000, George Sakkis wrote:
>...
>> Wow, can you make a coffee in.. 57ms ?
> [snip demonstration of xrange raising an exception]
> Of course! Can't you?
> 
> And if I use a microwave oven, 
     [*** deleted section outlining Guido's time machine structure ***]

Steve, consider yourself warned!!!

-- The PSU


From martin at v.loewis.de  Fri Feb 20 18:19:43 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 00:19:43 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <mailman.381.1235165762.11746.python-list@python.org>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<mailman.381.1235165762.11746.python-list@python.org>
Message-ID: <499F3A8F.9010200@v.loewis.de>


>>>>> u'\xb5'
>> u'\xb5'
>>>>> print u'\xb5'
>> ?
> 
> Unicode literals are *in the source file*, which can only have one
> encoding (for a given source file).
> 
>> (That last character shows up as a micron sign despite the fact that
>> my default encoding is ascii, so it seems to me that that unicode
>> string must somehow have picked up a latin-1 encoding.)
> 
> I think latin-1 was the default without a coding cookie line.  (May be
> uft-8 in 3.0).

It is, but that's irrelevant for the example. In the source

  u'\xb5'

all characters are ASCII (i.e. all of "letter u", "single
quote", "backslash", "letter x", "letter b", "digit 5").
As a consequence, this source text has the same meaning in all
supported source encodings (as source encodings must be ASCII
supersets).

The Unicode literal shown here does not get its interpretation
from Latin-1. Instead, it directly gets its interpretation from
the Unicode coded character set. The string is a short-hand
for

 u'\u00b5'

and this denotes character U+00B5 (just as u'\u20ac" denotes
U+20AC; the same holds for any other u'\uXXXX').

HTH,
Martin


From lionel.keene at gmail.com  Fri Feb 20 18:33:14 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 15:33:14 -0800 (PST)
Subject: "import" not working?
Message-ID: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>

Hello all:

I've crafted several classes and exceptions which I've stored in a
file called "DataFileType.py". I then invoke them from within other
files like this:


# Top of file

import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *

data = None

try:
   # Note: "INTData" is a class defined in "DataFileTypes"
    data = INTData("C:\SomeRawDataFile.int")

except DataFileError:
    print("Error opening data file")

except ResourceFileError:
    print("Error opening resource file")


The above works very well. No complaints. However, I'm experimenting
with the wxPython gui library and found that this no longer seems to
work when I add the crucial bits to one of their examples. I've copied
and run an example that came with wxPython and verified that, with no
modification on my part, it runs with no problem. I then add ONLY my
import instructions and try to instantiate an object as follows (I'm
only showing a portion of the file):


#!/usr/bin/env python

from numpy import arange, sin, pi

import matplotlib

matplotlib.use('WX')
from matplotlib.backends.backend_wx import FigureCanvasWx as
FigureCanvas

from matplotlib.figure import Figure

from wx import *

# The following 4 lines are my additions to the example code:
import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *
data = INTData("C:\SomeRawDataFile.int")


class CanvasFrame(Frame):
.
.
etc
.
.



Running the above program (which I've called "guiplottest.py")
generates an immediate error with the following traceback:

C:\Guiplottest.py
Traceback <most recent call last>:
   File "C:\GuiPlotTest.py", line 19, in <module>
      data = INTData("C:\SomeRawDataFile.int")
NameError: name 'INTData' is not defined


But "INTData" is defined...it's defined in "DataFileTypes" from which
I've imported everything. What's happening here? Thanks in advance!

-L


From emile at fenx.com  Fri Feb 20 18:45:53 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 20 Feb 2009 15:45:53 -0800
Subject: count secton of data in list
In-Reply-To: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
Message-ID: <gnnfbi$7u2$1@ger.gmane.org>

brianrpsgt1 wrote:
> 
> def step1(val):
       data2_row = []

>     for d1r in data1_row:
>         if d1r[1] >= val:
>             switch = 0
>             data2_row = d1r[0],d1r[1],d1r[2],switch
               data2_row.append([d1r[0],d1r[1],d1r[2],switch])


HTH,

Emile



From emile at fenx.com  Fri Feb 20 18:48:54 2009
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 20 Feb 2009 15:48:54 -0800
Subject: "import" not working?
In-Reply-To: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
Message-ID: <gnnfh6$7u2$2@ger.gmane.org>

Lionel wrote:
> from DataFileTypes import *

That's an import where you don't know what's getting import'd -- ie, 
namespace pollution


[snip]

> from wx import *
> 

and more here.  Try being explicit with your naming.

HTH,

Emile





From clp2 at rebertia.com  Fri Feb 20 18:52:10 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 15:52:10 -0800
Subject: "import" not working?
In-Reply-To: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>

On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.keene at gmail.com> wrote:
> Hello all:
>
> I've crafted several classes and exceptions which I've stored in a
> file called "DataFileType.py". I then invoke them from within other
> files like this:
>
>
> # Top of file
>
> import sys
> sys.path.append("c:\DataFileTypes")

Recall that the backslash is the escape character in Python and that
therefore you need to put \\ to get a backslash in the resulting path
string. Thus, the path you think you're adding isn't the path that's
getting added.
Alternatively, you can just use forward slashes instead (yes, that
works on Windows from Python).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From lionel.keene at gmail.com  Fri Feb 20 18:56:25 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 15:56:25 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
Message-ID: <7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>

On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > Hello all:
>
> > I've crafted several classes and exceptions which I've stored in a
> > file called "DataFileType.py". I then invoke them from within other
> > files like this:
>
> > # Top of file
>
> > import sys
> > sys.path.append("c:\DataFileTypes")
>
> Recall that the backslash is the escape character in Python and that
> therefore you need to put \\ to get a backslash in the resulting path
> string. Thus, the path you think you're adding isn't the path that's
> getting added.
> Alternatively, you can just use forward slashes instead (yes, that
> works on Windows from Python).
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

But I'm only using a single backslash in the first example I gave, and
it works just fine there. How can this be?


From rNOSPAMon at flownet.com  Fri Feb 20 19:10:15 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 16:10:15 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<mailman.381.1235165762.11746.python-list@python.org>
	<499F3A8F.9010200@v.loewis.de>
Message-ID: <rNOSPAMon-C73D1F.16101520022009@news.gha.chartermi.net>

In article <499F3A8F.9010200 at v.loewis.de>,
 "Martin v. L?wis" <martin at v.loewis.de> wrote:

> >>>>> u'\xb5'
> >> u'\xb5'
> >>>>> print u'\xb5'
> >> ?
> > 
> > Unicode literals are *in the source file*, which can only have one
> > encoding (for a given source file).
> > 
> >> (That last character shows up as a micron sign despite the fact that
> >> my default encoding is ascii, so it seems to me that that unicode
> >> string must somehow have picked up a latin-1 encoding.)
> > 
> > I think latin-1 was the default without a coding cookie line.  (May be
> > uft-8 in 3.0).
> 
> It is, but that's irrelevant for the example. In the source
> 
>   u'\xb5'
> 
> all characters are ASCII (i.e. all of "letter u", "single
> quote", "backslash", "letter x", "letter b", "digit 5").
> As a consequence, this source text has the same meaning in all
> supported source encodings (as source encodings must be ASCII
> supersets).
> 
> The Unicode literal shown here does not get its interpretation
> from Latin-1. Instead, it directly gets its interpretation from
> the Unicode coded character set. The string is a short-hand
> for
> 
>  u'\u00b5'
> 
> and this denotes character U+00B5 (just as u'\u20ac" denotes
> U+20AC; the same holds for any other u'\uXXXX').
> 
> HTH,
> Martin

Ah, that makes sense.  Thanks!

rg


From rNOSPAMon at flownet.com  Fri Feb 20 19:10:51 2009
From: rNOSPAMon at flownet.com (Ron Garret)
Date: Fri, 20 Feb 2009 16:10:51 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <rNOSPAMon-F444F1.16105120022009@news.gha.chartermi.net>

In article <499F397C.7030404 at v.loewis.de>,
 "Martin v. L?wis" <martin at v.loewis.de> wrote:

> > Yes, I know that.  But every concrete representation of a unicode string 
> > has to have an encoding associated with it, including unicode strings 
> > produced by the Python parser when it parses the ascii string "u'\xb5'"
> > 
> > My question is: what is that encoding?
> 
> The internal representation is either UTF-16, or UTF-32; which one is
> a compile-time choice (i.e. when the Python interpreter is built).
> 
> > Put this another way: I would have thought that when the Python parser 
> > parses "u'\xb5'" it would produce the same result as calling 
> > unicode('\xb5'), but it doesn't.
> 
> Right. In the former case, \xb5 denotes a Unicode character, namely
> U+00B5, MICRO SIGN. It is the same as u"\u00b5", and still the same
> as u"\N{MICRO SIGN}". By "the same", I mean "the very same".
> 
> OTOH, unicode('\xb5') is something entirely different. '\xb5' is a
> byte string with length 1, with a single byte with the numeric
> value 0xb5, or 181. It does not, per se, denote any specific character.
> It only gets a character meaning when you try to decode it to unicode,
> which you do with unicode('\xb5'). This is short for
> 
>   unicode('\xb5', sys.getdefaultencoding())
> 
> and sys.getdefaultencoding() is (or should be) "ascii". Now, in
> ASCII, byte 0xb5 does not have a meaning (i.e. it does not denote
> a character at all), hence you get a UnicodeError.
> 
> > Instead it seems to produce the same 
> > result as calling unicode('\xb5', 'latin-1').
> 
> Sure. However, this is only by coincidence, because latin-1 has the same
> code points as Unicode (for 0..255).
> 
> > But my default encoding 
> > is not latin-1, it's ascii.  So where is the Python parser getting its 
> > encoding from?  Why does parsing "u'\xb5'" not produce the same error as 
> > calling unicode('\xb5')?
> 
> Because \xb5 *directly* refers to character U+00b5, with no
> byte-oriented encoding in-between.
> 
> Regards,
> Martin

OK, I think I get it now.  Thanks!

rg


From mkhitrov at gmail.com  Fri Feb 20 19:14:57 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 20 Feb 2009 19:14:57 -0500
Subject: Using clock() in threading on Windows
Message-ID: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>

Greetings,

The threading module uses time.time in _Condition and _Thread classes
to implement timeouts. On Windows, time() typically has a resolution
of 15.625ms. In addition, if the system clock is changed (though ntp,
for example) it would reflect that change, causing the timeout to last
longer or shorter depending on which way the update went.

Would it not be better to use time.clock() instead? The resolution is
much better, and the value is not linked to system clock. Right now, I
replace the threading._time reference with clock in some of my
programs and everything works perfectly. Condition and Event timeouts
are precise down to the millisecond (resolution of the sleep
function), and I see no side-effects.

Is it possible to make that change part of the module itself (keeping
time() for linux systems), or can someone think of a reason why using
clock is a bad idea? I know that it's using QueryPerformanceCounter
for implementation, which has some known issues, but I still think
that the advantages outweigh potential faults.

- Max


From mccredie at gmail.com  Fri Feb 20 19:15:59 2009
From: mccredie at gmail.com (Matimus)
Date: Fri, 20 Feb 2009 16:15:59 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
Message-ID: <11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>

On Feb 20, 3:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > > Hello all:
>
> > > I've crafted several classes and exceptions which I've stored in a
> > > file called "DataFileType.py". I then invoke them from within other
> > > files like this:
>
> > > # Top of file
>
> > > import sys
> > > sys.path.append("c:\DataFileTypes")
>
> > Recall that the backslash is the escape character in Python and that
> > therefore you need to put \\ to get a backslash in the resulting path
> > string. Thus, the path you think you're adding isn't the path that's
> > getting added.
> > Alternatively, you can just use forward slashes instead (yes, that
> > works on Windows from Python).
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> But I'm only using a single backslash in the first example I gave, and
> it works just fine there. How can this be?

You must be running the python script from a directory where the file
you are trying to import is already in the path. It never tries to
look in the (bad) path because it found a file with the same name
locally. My guess is that you are running the wx example from another
location, and that is when you run into problems.

Matt


From steve at holdenweb.com  Fri Feb 20 19:32:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 20 Feb 2009 19:32:36 -0500
Subject: "import" not working?
In-Reply-To: <50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<50697b2c0902201552q20c9a682y55b5c40f801e96a2@mail.gmail.com>
Message-ID: <gnni3a$eme$1@ger.gmane.org>

Chris Rebert wrote:
> On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.keene at gmail.com> wrote:
>> Hello all:
>>
>> I've crafted several classes and exceptions which I've stored in a
>> file called "DataFileType.py". I then invoke them from within other
>> files like this:
>>
>>
>> # Top of file
>>
>> import sys
>> sys.path.append("c:\DataFileTypes")
> 
> Recall that the backslash is the escape character in Python and that
> therefore you need to put \\ to get a backslash in the resulting path
> string. Thus, the path you think you're adding isn't the path that's
> getting added.
> Alternatively, you can just use forward slashes instead (yes, that
> works on Windows from Python).
> 
In fact "\D" isn't a defined escape character, so this particular usage
does give the right path, though your general point is good.

>>> "\D"
'\\D'
>>> len("\D")
2

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Fri Feb 20 19:40:03 2009
From: lionel.keene at gmail.com (Lionel)
Date: Fri, 20 Feb 2009 16:40:03 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
Message-ID: <65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>

On Feb 20, 4:15?pm, Matimus <mccre... at gmail.com> wrote:
> On Feb 20, 3:56?pm, Lionel <lionel.ke... at gmail.com> wrote:
>
>
>
>
>
> > On Feb 20, 3:52?pm, Chris Rebert <c... at rebertia.com> wrote:
>
> > > On Fri, Feb 20, 2009 at 3:33 PM, Lionel <lionel.ke... at gmail.com> wrote:
> > > > Hello all:
>
> > > > I've crafted several classes and exceptions which I've stored in a
> > > > file called "DataFileType.py". I then invoke them from within other
> > > > files like this:
>
> > > > # Top of file
>
> > > > import sys
> > > > sys.path.append("c:\DataFileTypes")
>
> > > Recall that the backslash is the escape character in Python and that
> > > therefore you need to put \\ to get a backslash in the resulting path
> > > string. Thus, the path you think you're adding isn't the path that's
> > > getting added.
> > > Alternatively, you can just use forward slashes instead (yes, that
> > > works on Windows from Python).
>
> > > Cheers,
> > > Chris
>
> > > --
> > > Follow the path of the Iguana...http://rebertia.com
>
> > But I'm only using a single backslash in the first example I gave, and
> > it works just fine there. How can this be?
>
> You must be running the python script from a directory where the file
> you are trying to import is already in the path. It never tries to
> look in the (bad) path because it found a file with the same name
> locally. My guess is that you are running the wx example from another
> location, and that is when you run into problems.
>
> Matt- Hide quoted text -
>
> - Show quoted text -

Okay, moving the wx example into the same directory containing the
first example that was working fixed it. This directory only contains
these two modules and nothing else. The old directory which contained
the example that wasn't working did not contain a module with the same
name as the one I was trying to import, so i don't know why this "fix"
worked.


From kevinosky at gmail.com  Fri Feb 20 19:52:43 2009
From: kevinosky at gmail.com (kevin hayes)
Date: Fri, 20 Feb 2009 16:52:43 -0800
Subject: Python won't run
Message-ID: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>

Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
opening and running after I ran a few programs.  I installed python 2.6
hoping this would allow me to open idle and start learning to program.  How
do I get Idle running again?
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From sjmachin at lexicon.net  Fri Feb 20 20:00:45 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 20 Feb 2009 17:00:45 -0800 (PST)
Subject: cx_oracle -- how to insert "&"
References: 1af94e53-7a85-46e9-bf33-7165c9f47c8b@q30g2000prq.googlegroups.com
Message-ID: <04fcf9b4-d496-4585-a63e-d76086fd1cc3@t11g2000yqg.googlegroups.com>

On Feb 21, 3:46?am, Allen <ygua... at gmail.com> wrote:
> I am using Python with cx_oracle to load an excel spreadsheet into an
> Oracle table. There are lots of text on the spreadsheet that have "&"
> in them which I want to keep in the table. But inserting those text
> will fail.

"Will fail" (future tense) or have failed (past tense)??

> Is there a work around for this? I can filter out the
> failed insert statements and in SQLPLUS set define off ?to run those
> statements, but it would be nice to insert "&" directly in PYTHON.
>

We don't have crystal balls. More information please:

1. How are you digging the data out of the spreadsheet?

2. What does print repr(text_on_the_spreadsheet) show for the failing
cases?

3. Show us your code for inserting.

4. What is the failure message?

5. What does "set define off" do for you in SQLPLUS?


From clp2 at rebertia.com  Fri Feb 20 20:03:07 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:03:07 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
Message-ID: <50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com> wrote:
> Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
> opening and running after I ran a few programs.  I installed python 2.6
> hoping this would allow me to open idle and start learning to program.  How
> do I get Idle running again?

What error do you get when trying to run it from the command line?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dsdale24 at gmail.com  Fri Feb 20 20:12:01 2009
From: dsdale24 at gmail.com (Darren Dale)
Date: Fri, 20 Feb 2009 17:12:01 -0800 (PST)
Subject: how to assert that method accepts specific types
Message-ID: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>

I would like to assert that a method accepts certain types. I have a
short example that works:

from functools import wraps

def accepts(*types):
    def check_accepts(f):
        @wraps(f)
        def new_f(self, other):
            assert isinstance(other, types), \
                "arg %r does not match %s" % (other, types)
            return f(self, other)
        return new_f
    return check_accepts

class Test(object):

    @accepts(int)
    def check(self, obj):
        print obj

t = Test()
t.check(1)

but now I want Test.check to accept an instance of Test as well. Does
anyone know how this can be accomplished? The following class
definition for Test raises a NameError:

class Test(object):

    @accepts(int, Test)
    def check(self, obj):
        print obj

Thanks,
Darren


From clp2 at rebertia.com  Fri Feb 20 20:20:02 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:20:02 -0800
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <50697b2c0902201720v495e62fen590ca3b564866f40@mail.gmail.com>

On Fri, Feb 20, 2009 at 5:12 PM, Darren Dale <dsdale24 at gmail.com> wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:
>
> from functools import wraps
>
> def accepts(*types):
>    def check_accepts(f):
>        @wraps(f)
>        def new_f(self, other):
>            assert isinstance(other, types), \
>                "arg %r does not match %s" % (other, types)
>            return f(self, other)
>        return new_f
>    return check_accepts
>
> class Test(object):
>
>    @accepts(int)
>    def check(self, obj):
>        print obj
>
> t = Test()
> t.check(1)
>
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
>
> class Test(object):
>
>    @accepts(int, Test)
>    def check(self, obj):
>        print obj

You're going to have to either inject it after the class definition
somehow, or give the class name as a string and use eval() or similar.
The class object doesn't exist until the entire class body has
finished executing, so you can't refer to the class within its own
body.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Fri Feb 20 20:28:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:28:19 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
Message-ID: <50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>

How were you running IDLE previously?

- Chris

On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com> wrote:
> how do i do that?
>
> On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> I meant, what happens when you run *IDLE* from the command line?
>>
>> - Chris
>>
>> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> > When I type "python" into terminal I get >>> but I would like to be able
>> > to
>> > open it as I would any application.  Thanks.
>> >
>> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> >>
>> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com>
>> >> wrote:
>> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
>> >> > opening and running after I ran a few programs.  I installed python
>> >> > 2.6
>> >> > hoping this would allow me to open idle and start learning to
>> >> > program.
>> >> >  How
>> >> > do I get Idle running again?
>> >>
>> >> What error do you get when trying to run it from the command line?
>> >>
>> >> Cheers,
>> >> Chris
>> >>
>> >> --
>> >> Follow the path of the Iguana...
>> >> http://rebertia.com


From tjreedy at udel.edu  Fri Feb 20 20:38:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 20:38:39 -0500
Subject: What encoding does u'...' syntax use?
In-Reply-To: <499F3A8F.9010200@v.loewis.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	<mailman.381.1235165762.11746.python-list@python.org>
	<499F3A8F.9010200@v.loewis.de>
Message-ID: <gnnluv$n3r$1@ger.gmane.org>

Martin v. L?wis wrote:
mehow have picked up a latin-1 encoding.)
>> I think latin-1 was the default without a coding cookie line.  (May be
>> uft-8 in 3.0).
> 
> It is, but that's irrelevant for the example. In the source
> 
>   u'\xb5'
> 
> all characters are ASCII (i.e. all of "letter u", "single
> quote", "backslash", "letter x", "letter b", "digit 5").
> As a consequence, this source text has the same meaning in all
> supported source encodings (as source encodings must be ASCII
> supersets).

I think I understand now that the coding cookie only matters if I use an 
editor that actually stores *non-ascii* bytes in the file for the Python 
parser to interpret.



From clp2 at rebertia.com  Fri Feb 20 20:41:57 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 20 Feb 2009 17:41:57 -0800
Subject: Python won't run
In-Reply-To: <37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
Message-ID: <50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>

Hmm. How did you install Python/IDLE?
Also, please use Reply-All as others on the list might have helpful ideas.

- Chris

On Fri, Feb 20, 2009 at 5:34 PM, kevin hayes <kevinosky at gmail.com> wrote:
> I was clicking on the application.  then the idle/python icon would bounce
> in my
> dock and then disappear.
> On Fri, Feb 20, 2009 at 5:28 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>>
>> How were you running IDLE previously?
>>
>> - Chris
>>
>> On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> > how do i do that?
>> >
>> > On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> >>
>> >> I meant, what happens when you run *IDLE* from the command line?
>> >>
>> >> - Chris
>> >>
>> >> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com>
>> >> wrote:
>> >> > When I type "python" into terminal I get >>> but I would like to be
>> >> > able
>> >> > to
>> >> > open it as I would any application.  Thanks.
>> >> >
>> >> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com>
>> >> > wrote:
>> >> >>
>> >> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com>
>> >> >> wrote:
>> >> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle
>> >> >> > stopped
>> >> >> > opening and running after I ran a few programs.  I installed
>> >> >> > python
>> >> >> > 2.6
>> >> >> > hoping this would allow me to open idle and start learning to
>> >> >> > program.
>> >> >> >  How
>> >> >> > do I get Idle running again?
>> >> >>
>> >> >> What error do you get when trying to run it from the command line?
>> >> >>
>> >> >> Cheers,
>> >> >> Chris
>> >> >>
>> >> >> --
>> >> >> Follow the path of the Iguana...
>> >> >> http://rebertia.com


From dsdale24 at gmail.com  Fri Feb 20 20:43:46 2009
From: dsdale24 at gmail.com (Darren Dale)
Date: Fri, 20 Feb 2009 17:43:46 -0800 (PST)
Subject: how to assert that method accepts specific types
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
	<mailman.393.1235179208.11746.python-list@python.org>
Message-ID: <72d00e6a-cc14-4b59-9f41-a1adbe7e9ca8@x10g2000yqk.googlegroups.com>

On Feb 20, 8:20?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 20, 2009 at 5:12 PM, Darren Dale <dsdal... at gmail.com> wrote:
> > I would like to assert that a method accepts certain types. I have a
> > short example that works:
>
> > from functools import wraps
>
> > def accepts(*types):
> > ? ?def check_accepts(f):
> > ? ? ? ?@wraps(f)
> > ? ? ? ?def new_f(self, other):
> > ? ? ? ? ? ?assert isinstance(other, types), \
> > ? ? ? ? ? ? ? ?"arg %r does not match %s" % (other, types)
> > ? ? ? ? ? ?return f(self, other)
> > ? ? ? ?return new_f
> > ? ?return check_accepts
>
> > class Test(object):
>
> > ? ?@accepts(int)
> > ? ?def check(self, obj):
> > ? ? ? ?print obj
>
> > t = Test()
> > t.check(1)
>
> > but now I want Test.check to accept an instance of Test as well. Does
> > anyone know how this can be accomplished? The following class
> > definition for Test raises a NameError:
>
> > class Test(object):
>
> > ? ?@accepts(int, Test)
> > ? ?def check(self, obj):
> > ? ? ? ?print obj
>
> You're going to have to either inject it after the class definition
> somehow, or give the class name as a string and use eval() or similar.
> The class object doesn't exist until the entire class body has
> finished executing, so you can't refer to the class within its own
> body.

Thats too bad, thanks for clarifying.


From tjreedy at udel.edu  Fri Feb 20 20:48:37 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 20 Feb 2009 20:48:37 -0500
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <gnnmhl$p1t$1@ger.gmane.org>

Darren Dale wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:
> 
> from functools import wraps
> 
> def accepts(*types):
>     def check_accepts(f):
>         @wraps(f)
>         def new_f(self, other):
>             assert isinstance(other, types), \
>                 "arg %r does not match %s" % (other, types)
>             return f(self, other)
>         return new_f
>     return check_accepts
> 
> class Test(object):
> 
>     @accepts(int)
>     def check(self, obj):
>         print obj
> 
> t = Test()
> t.check(1)
> 
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
> 
> class Test(object):
> 
>     @accepts(int, Test)
>     def check(self, obj):
>         print obj

Because Test does not exist at the time the function is compiled.
Remove '@accepts...' and put Test.check = accepts(int, Test)(Test.check) 
after the class definition and it should work.

tjr



From andrew at acooke.org  Fri Feb 20 20:50:27 2009
From: andrew at acooke.org (andrew cooke)
Date: Fri, 20 Feb 2009 22:50:27 -0300 (CLST)
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <7c51ecbf8a5d5accbd4184216e51ba97.squirrel@acooke.dyndns.org>

Darren Dale wrote:
> I would like to assert that a method accepts certain types. I have a
> short example that works:

just in case it's useful - are you aware that pep3107 (which looks like it
should be leet-speak for something) is implemented in python 3? 
http://www.python.org/dev/peps/pep-3107/

andrew



From kevinosky at gmail.com  Fri Feb 20 20:51:37 2009
From: kevinosky at gmail.com (kevin hayes)
Date: Fri, 20 Feb 2009 17:51:37 -0800
Subject: Python won't run
In-Reply-To: <50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
Message-ID: <37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>

I installed it...with the package that came with python 2.6. When I had 2.5
I was using it(idle) successfully, until I ran a few programs that I got off
the web.  Then, Idle wouldn't open (it just bounced in the dock and then
disappeared).  So I tried installing 2.6 and the same thing happened.

On Fri, Feb 20, 2009 at 5:41 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> Hmm. How did you install Python/IDLE?
> Also, please use Reply-All as others on the list might have helpful ideas.
>
> - Chris
>
> On Fri, Feb 20, 2009 at 5:34 PM, kevin hayes <kevinosky at gmail.com> wrote:
> > I was clicking on the application.  then the idle/python icon would
> bounce
> > in my
> > dock and then disappear.
> > On Fri, Feb 20, 2009 at 5:28 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> >>
> >> How were you running IDLE previously?
> >>
> >> - Chris
> >>
> >> On Fri, Feb 20, 2009 at 5:24 PM, kevin hayes <kevinosky at gmail.com>
> wrote:
> >> > how do i do that?
> >> >
> >> > On Fri, Feb 20, 2009 at 5:20 PM, Chris Rebert <clp2 at rebertia.com>
> wrote:
> >> >>
> >> >> I meant, what happens when you run *IDLE* from the command line?
> >> >>
> >> >> - Chris
> >> >>
> >> >> On Fri, Feb 20, 2009 at 5:16 PM, kevin hayes <kevinosky at gmail.com>
> >> >> wrote:
> >> >> > When I type "python" into terminal I get >>> but I would like to be
> >> >> > able
> >> >> > to
> >> >> > open it as I would any application.  Thanks.
> >> >> >
> >> >> > On Fri, Feb 20, 2009 at 5:03 PM, Chris Rebert <clp2 at rebertia.com>
> >> >> > wrote:
> >> >> >>
> >> >> >> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com
> >
> >> >> >> wrote:
> >> >> >> > Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle
> >> >> >> > stopped
> >> >> >> > opening and running after I ran a few programs.  I installed
> >> >> >> > python
> >> >> >> > 2.6
> >> >> >> > hoping this would allow me to open idle and start learning to
> >> >> >> > program.
> >> >> >> >  How
> >> >> >> > do I get Idle running again?
> >> >> >>
> >> >> >> What error do you get when trying to run it from the command line?
> >> >> >>
> >> >> >> Cheers,
> >> >> >> Chris
> >> >> >>
> >> >> >> --
> >> >> >> Follow the path of the Iguana...
> >> >> >> http://rebertia.com
>
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From lists at cheimes.de  Fri Feb 20 20:56:36 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 21 Feb 2009 02:56:36 +0100
Subject: Using clock() in threading on Windows
In-Reply-To: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>
References: <26ddd1750902201614h2f692e0br7b1ae44f3566f8b4@mail.gmail.com>
Message-ID: <gnnn0k$pul$1@ger.gmane.org>

Maxim Khitrov wrote:
> The threading module uses time.time in _Condition and _Thread classes
> to implement timeouts. On Windows, time() typically has a resolution
> of 15.625ms. In addition, if the system clock is changed (though ntp,
> for example) it would reflect that change, causing the timeout to last
> longer or shorter depending on which way the update went.
> 
> Would it not be better to use time.clock() instead? The resolution is
> much better, and the value is not linked to system clock. Right now, I
> replace the threading._time reference with clock in some of my
> programs and everything works perfectly. Condition and Event timeouts
> are precise down to the millisecond (resolution of the sleep
> function), and I see no side-effects.
> 
> Is it possible to make that change part of the module itself (keeping
> time() for linux systems), or can someone think of a reason why using
> clock is a bad idea? I know that it's using QueryPerformanceCounter
> for implementation, which has some known issues, but I still think
> that the advantages outweigh potential faults.

Can you make a feature request? Your proposal seems sensible. A trivial
patch should solve the issue:

from time import sleep as _sleep
if _sys.name == "win32":
    from time import clock as _time
else:
    from time import time as _time

However I'm not sure about the implications.

Christian



From evert.rol at gmail.com  Fri Feb 20 21:01:19 2009
From: evert.rol at gmail.com (Evert Rol)
Date: Sat, 21 Feb 2009 03:01:19 +0100
Subject: Framework installation of 2.6 on OS X, with specified prefix
In-Reply-To: <nad-2C4315.12484620022009@news.gmane.org>
References: <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F@gmail.com>
	<nad-2C4315.12484620022009@news.gmane.org>
Message-ID: <1D24E2A3-0456-49BE-ABD6-E0B706C5EC09@gmail.com>


On 20 Feb 2009, at 21:48 , Ned Deily wrote:

> In article <F80F3FDD-B12F-42D5-BB05-4A4B180FAC1F at gmail.com>,
> Evert Rol <evert.rol at gmail.com> wrote:
>> I'm trying to install Python 2.6 from source on Mac OS X.5, in its  
>> own
>> directory using a framework install. That goes fine, up to the point
>> where it wants to install the applications that come with it (eg, the
>> Wish shell): it tries to install things into /Applications, instead  
>> of
>> eg <prefix>/Applications.
>> Here's my configure line (the flags are there just to let it find my
>> own installed readline):
>>
>> CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --prefix=/sw --
>> enable-shared --enable-framework=/sw/Library/Frameworks --with-
>> readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5
>>
>>
>> And the last part of the output of 'make install':
>>
>> ../python.exe ./scripts/BuildApplet.py \
>> 		--destroot "" \
>> 		--python=/sw/Library/Frameworks/Python.framework/Versions/2.6/
>> Resources/Python.app/Contents/MacOS/Python`test -f "/sw/Library/
>> Frameworks/Python.framework/Versions/2.6/Resources/Python.app/ 
>> Contents/
>> MacOS/Python-32" && echo "-32"`  \
>> 		--output "/sw/Applications/Python 2.6/Build Applet.app" \
>> 		./scripts/BuildApplet.py
>> cd PythonLauncher && make install DESTDIR=
>> test -d "/Applications/Python 2.6" || mkdir -p "/Applications/Python
>> 2.6"
>> mkdir: /Applications/Python 2.6: Permission denied
>> make[2]: *** [install] Error 1
>> make[1]: *** [install_PythonLauncher] Error 2
>> make: *** [frameworkinstallapps] Error 2
>>
>> Is there an option on the configure line that I need to set, or
>> something in setup.py? Or perhaps hack the Makefile?
>
> FWIW, the OS X build-installer.py script handles this by specifying a
> DESTDIR on the make install steps rather than including a --prefix on
> the configure.   See Mac/BuildScript/build-installer.py.

That worked: make install DESTDIR=/sw .
Not sure if it's the proper way to do it, but it installed fine now.
I did have to change the configure line:

CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib ./configure --
enable-shared --enable-framework=/Library/Frameworks --with-
readline=/sw --with-pth CC=gcc-4.2  MACOSX_DEPLOYMENT_TARGET=10.5

So --prefix has gone, and --enable-framework lost the /sw. Then the  
DESTDIR setting on the make line prepends it as necessary.

I would have hoped an option on the configure line would have taken  
care of this (--exec-prefix doesn't do it, at least), but well, maybe  
next time.

(Actually, checking again, I now also have a /sw/sw/Applications  
directory, next to the /sw/Applications dir. The former contains  
Applet.app; no idea how it ended up there, while IDLE.app and Python  
Launcher.app ended up in /sw/Applications. So, it almost worked; maybe  
there's some double $DESTDIR/$DESTDIR in the Makefile. Good enough for  
my purposes though.)

Thanks!

   Evert



From nad at acm.org  Fri Feb 20 21:28:18 2009
From: nad at acm.org (Ned Deily)
Date: Fri, 20 Feb 2009 18:28:18 -0800
Subject: Python won't run
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
	<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>
Message-ID: <nad-75A7C1.18281820022009@news.gmane.org>

In article 
<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00 at mail.gmail.com>,
 kevin hayes <kevinosky at gmail.com> wrote:
> I installed it...with the package that came with python 2.6. When I had 2.5
> I was using it(idle) successfully, until I ran a few programs that I got off
> the web.  Then, Idle wouldn't open (it just bounced in the dock and then
> disappeared).  So I tried installing 2.6 and the same thing happened.

There may be some clues in the system.log as to why IDLE is not 
launching.  Launch /Applications/Utilities/Console.app and under its 
File menu select Open System Log.  Now try to launch IDLE again by 
double-clicking on its icon and see if any suspicious messages show up 
in the log.  You could also try moving any IDLE preferences files out of 
the way temporarily and see if that helps.  From a Terminal window, type:
    cd $HOME
    mv .idlerc .idlerc-disabled
then try launching IDLE again.

-- 
 Ned Deily,
 nad at acm.org



From odeits at gmail.com  Fri Feb 20 22:14:02 2009
From: odeits at gmail.com (odeits)
Date: Fri, 20 Feb 2009 19:14:02 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
Message-ID: <9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>

On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:
> On Feb 15, 9:56?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Sun, Feb 15, 2009 at 9:17 PM, ?<pyt... at bdurham.com> wrote:
> > > I need to test strings to determine if one of a list of chars is in the
> > > string. A simple example would be to test strings to determine if they have
> > > a vowel (aeiouAEIOU) present.
>
> > > I was hopeful that there was a built-in method that operated similar to
> > > startswith where I could pass a tuple of chars to be tested, but I could not
> > > find such a method.
>
> > > Which of the following techniques is most Pythonic or are there better ways
> > > to perform this type of match?
>
> > > # long and hard coded but short circuits as soon as match found
> > > if 'a' in word or 'e' in word or 'i' in word or 'u' in word or ... :
>
> > > -OR-
>
> > > # flexible, but no short circuit on first match
> > > if [ char for char in word if char in 'aeiouAEIOU' ]:
>
> > Just use the fairly new builtin function any() to make it short-circuit:
>
> > if any(char.lower() in 'aeiou' for char in word):
> > ? ? do_whatever()
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> If you want to generalize it you should look at setshttp://docs.python.org/library/sets.html
>
> It seems what you are actually testing for is if the intersection of
> the two sets is not empty where the first set is the characters in
> your word and the second set is the characters in your defined string.

To expand on what I was saying I thought i should provide a code
snippet:

WORD = 'g' * 100
WORD2 = 'g' * 50 + 'U'
VOWELS = 'aeiouAEIOU'
BIGWORD = 'g' * 10000 + 'U'

def set_test(vowels, word):

    vowels = set( iter(vowels))
    letters = set( iter(word) )

    if letters & vowels:
        return True
    else:
        return False

with python 2.5 I got 1.30 usec/pass against the BIGWORD




From odeits at gmail.com  Fri Feb 20 22:20:30 2009
From: odeits at gmail.com (odeits)
Date: Fri, 20 Feb 2009 19:20:30 -0800 (PST)
Subject: Changing the Image on a button
References: <59253b2f-c90d-4308-835d-e81a2e602127@p23g2000prp.googlegroups.com>
	<mailman.58.1234802423.11746.python-list@python.org>
	<e3b4b263-fd1a-4ee4-9522-5cc6802ba36b@x29g2000prf.googlegroups.com>
	<mailman.121.1234885468.11746.python-list@python.org>
Message-ID: <612b19f3-a577-4a92-8be4-cad02af5922a@a39g2000prl.googlegroups.com>

On Feb 17, 7:14?am, John Posner <jjpos... at snet.net> wrote:
> ?>> > Try this change:
> ?>> >
> ?>> > ? from: btn.configure(image = None)
> ?>> > ? ? to: img1.blank()
> ?>> >
> ?>>
> ?>> This does in fact clear the image out, however it isn't causing the
> ?>> text to display... Do i have have to create a new button and swap it
> ?>> out?
>
> I knew you were gonna ask that! :-) I haven't worked in this area before,
> but I
> found this athttp://effbot.org/tkinterbook/button.htm:
>
> ? ? In earlier versions of Tkinter, the image option overrides the text
> option.
> ? ? If you specify both, only the image is displayed. In later versions, you
> can
> ? ? use the compound option to change this behavior. To display text on top
> of
> ? ? an image, set compound to CENTER:
>
> ? ? ?b = Button(master, text="Click me", image=pattern, compound=CENTER)
>
> So here's a reworking, in which the text and image are both toggled by
> pressing the button:
>
> ### button that toggles both text and image
> from Tkinter import *
>
> def pushed():
> ? ? """callback: button push"""
>
> ? ? global toggle
>
> ? ? if toggle:
> ? ? ? ? btn.config(text="", image=img_empty)
> ? ? ? ? toggle = not toggle
> ? ? else:
> ? ? ? ? btn.config(text=msg, image=img_good)
> ? ? ? ? toggle = not toggle
>
> ### main program
> toggle = True
> msg = "hello"
>
> root = Tk()
>
> ### store two versions of an image in global variables:
> # 1. original image
> img_good = PhotoImage(file="bacon.gif")
>
> # 2. blank image, created by copying and erasing
> img_empty = img_good.copy()
> img_empty.blank()
>
> ### create toggle button
> btn = Button(root, compound=CENTER,
> ? ? ? ? ? ? text="hello", font="helvetica 14 bold",
> ? ? ? ? ? ? image=img_good,
> ? ? ? ? ? ? command=pushed)
> btn.pack()
>
> ### go
> root.mainloop()
>
> E-mail message checked by Spyware Doctor (6.0.0.386)
> Database version: 5.11780http://www.pctools.com/en/spyware-doctor-antivirus/

Thank you very much for your help! It is now behaving the way I wanted!


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 23:17:41 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 02:17:41 -0200
Subject: Killing subservient threads
References: <4bdc5d28-9ad9-446f-bd37-9e431fd702c6@p36g2000prp.googlegroups.com>
	<mailman.370.1235150534.11746.python-list@python.org>
	<df56c9b4-5d0b-45c8-9e50-52c2e6c181c5@d2g2000pra.googlegroups.com>
Message-ID: <op.upoovrdmx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 16:15:10 -0200, jimzat <jimzat at iname.com> escribi?:

> I am using the thread module and calling thread.start_new_thread
> (...).  If I use t=thread.start_new_thread(...) and later set
> t.terminate, I get "AttributeError: 'int' object has no attribute
> 'terminate'"

Use the threading module instead, that provides a higher level interface.  
If you originally had:

thread.start_new_thread(function, args)

then it becomes:

polling_thread = threading.Thread(target=function, args=args)
...
polling_thread.start()

> What is the proper way to do this?  I don't want to use globals as I
> will have multiple child windows of various classes.

Use an attribute of this Thread instance. Either a simple boolean or a  
Condition/Event object as Christian Heimes suggested.

-- 
Gabriel Genellina



From kwmsmith at gmail.com  Fri Feb 20 23:50:03 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Fri, 20 Feb 2009 22:50:03 -0600
Subject: can multi-core improve single funciton?
In-Reply-To: <btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9220.1234269815.3487.python-list@python.org>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
	<mailman.382.1235166735.11746.python-list@python.org>
	<btmdnRfStdfaswLUnZ2dnUVZ_guWnZ2d@posted.visi>
Message-ID: <c266a7930902202050g35e53ca6u39e1abaf355516d7@mail.gmail.com>

On Fri, Feb 20, 2009 at 4:27 PM, Grant Edwards <invalid at invalid> wrote:
> On one hand, the upshot of that is that by finding an
> appropriate library module you might gain some of the same
> benefits as removing the GIL.
>
> On the other hand, that doesn't help if you're doing something
> original enough that nobody has written a library to handle
> large chunks of it.
>
> And on the grasping hand, I find that most of us vastly
> overestimate the originality of what we're doing.

+1 The Mote in God's Eye / The Gripping Hand reference!

Kurt


From gagsl-py2 at yahoo.com.ar  Fri Feb 20 23:52:05 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 02:52:05 -0200
Subject: function factory question: embed current values of object
	attributes
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
Message-ID: <op.upoqg3zix6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 16:49:21 -0200, Alan Isaac <aisaac at american.edu>  
escribi?:

> I have a class `X` where many parameters are set
> at instance initialization.  The parameter values
> of an instance `x` generally remain unchanged,
> but is there way to communicate to a method that
> it depends only on the initial values of these parameters
> (and does not need to worry about any changes)?
>
> The behavior of method `m` depends on these parameter values.
> It turns out `m` gets called a lot, which means
> that the pameter values are accessed over and over
> (self.p0, self.p1, etc).  I would like to
> manufacture a function equivalent to the method
> that simply uses fixed values (the values at the
> time it is manufactured).  I do not care if this
> function is attached to `x` or not.

Not automatically; but you could refactor the method to call an external  
function with arguments:

class X(...):
   ...
   def foo(self):
     c = self.a + self.b
     return c

Rewrite the method as:

   def foo(self):
     return _foo(self.a, self.b)

and define _foo outside the class:

def _foo(a, b):
   c = a + b
   return c

If you want a "frozen" function (that is, a function already set-up with  
the parameters taken from the current values of x.a, x.b) use  
functools.partial:

x = X()
frozen_foo = functools.partial(_foo, a=x.a, b=x.b)
frozen_foo() # equivalent to x.foo() at the time it was defined

But if you call this in a loop, perhaps it's enough to assign x.a, x.b to  
local variables and call _foo with those arguments.

-- 
Gabriel Genellina



From rozzin at geekspace.com  Sat Feb 21 00:20:20 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 00:20:20 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
Message-ID: <87bpswe57v.fsf@slice.rozzin.com>

Jesse Noller <jnoller at gmail.com> writes:
>
> On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> <Graham.Dumpleton at gmail.com> wrote:
> > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > _bootstrap() doing:
> >
> >  os.close(sys.stdin.fileno())
> >
> > rather than:
> >
> >  sys.stdin.close()
> >
> > Technically it is feasible that stdin could have been replaced with
> > something other than a file object, where the replacement doesn't have
> > a fileno() method.
> >
> > In that sort of situation an AttributeError would be raised, which
> > isn't going to be caught as either OSError or ValueError, which is all
> > the code watches out for.
> 
> I don't know why it was implemented that way. File an issue on the
> tracker and assign it to me (jnoller) please.

My guess would be: because it's also possible for sys.stdin to be a
file that's open in read+*write* mode, and for that file to have
pending output buffered (for example, in the case of a socketfile).

There's a general guideline, inherited from C, that one should ensure
that the higher-level close() routine is invoked on a given
file-descriptor in at most *one* process after that descriptor has
passed through a fork(); in the other (probably child) processes, the
lower-level close() routine should be called to avoid a
double-flush--whereby buffered data is flushed out of one process, and
then the *same* buffered data is flushed out of the (other)
child-/parent-process' copy of the file-object.

So, if you call sys.stdin.close() in the child-process in
_bootstrap(), then it could lead to a double-flush corrupting output
somewhere in the application that uses the multiprocessing module.

You can expect similar issues with just about /any/ `file-like objects'
that might have `file-like semantics' of buffering data and flushing
it on close, also--because you end up with multiple copies of the same
object in `pre-flush' state, and each copy tries to flush at some point.

As such, I'd recommend against just using .close(); you might use
something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
`else' clause unconditionally calls sys.stdin.close(), then you still
have double-flush problems if someone's set sys.stdin to a file-like
object with output-buffering.

I guess you could try calling that an `edge-case' and seeing if anyone
screams. It'd be sort-of nice if there was finer granularity in the
file API--maybe if file.close() took a boolean `flush' argument....

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From nagle at animats.com  Sat Feb 21 00:33:38 2009
From: nagle at animats.com (John Nagle)
Date: Fri, 20 Feb 2009 21:33:38 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.9587.1234730192.3487.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
Message-ID: <499f8a8e$0$1588$742ec2ed@news.sonic.net>

Steve Holden wrote:
> John Nagle wrote:
>> Benjamin Kaplan wrote:
>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>
...Re "bytes" not behaving as documented in 2.6:

>>    That's indeed how Python 2.6 works.  But that's not how
>> PEP 3137 says it's supposed to work.
>>
>> Guido:
>>
>>  "I propose the following type names at the Python level:
>>
>>         * bytes is an immutable array of bytes (PyString)
>>         * bytearray is a mutable array of bytes (PyBytes)"
...
>> (Not true in Python 2.6 
>>
>> Is this a bug, a feature, a documentation error, or bad design?
>>
> It's a feature. In fact all that was done to accommodate easier
> migration to 3.x is easily shown in one statement:
> 
>>>> str is bytes
> True
> 
> So that's why bytes works the way it does in 2.6 ... hence my contested
> description of it as an "ugly hack". I am happy to withdraw "ugly", but
> I think "hack" could still be held to apply.

    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?

    The way it works in 2.6 makes it necessary to do "ord" conversions
where they shouldn't be required.

				John Nagle


From Scott.Daniels at Acm.Org  Sat Feb 21 01:05:40 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 20 Feb 2009 22:05:40 -0800
Subject: Python won't run
In-Reply-To: <mailman.392.1235178193.11746.python-list@python.org>
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<mailman.392.1235178193.11746.python-list@python.org>
Message-ID: <m_udnYICY_q_BALUnZ2dnUVZ_giWnZ2d@pdx.net>

Chris Rebert wrote:
> On Fri, Feb 20, 2009 at 4:52 PM, kevin hayes <kevinosky at gmail.com> wrote:
>> Hi, I had python 2.5 installed on my Mac osx 10.4.11 and idle stopped
>> opening and running after I ran a few programs.  I installed python 2.6
>> hoping this would allow me to open idle and start learning to program.  How
>> do I get Idle running again?
> 
> What error do you get when trying to run it from the command line?
> 
> Cheers,
> Chris
> 
Try from the command line:

     $ python -m idlelib.idle -n

If it works, do a bit and see how that goes.  Then try:

     $ python -m idlelib.idle

In both cases, you _may_ get error messages to the command window that
help diagnose.

--Scott David Daniels
Scott.Daniels at Acm.Org





From rhodri at wildebst.demon.co.uk  Sat Feb 21 01:25:08 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 21 Feb 2009 06:25:08 -0000
Subject: how to assert that method accepts specific types
In-Reply-To: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
Message-ID: <op.upour6b5a8ncjz@gnudebst>

On Sat, 21 Feb 2009 01:12:01 -0000, Darren Dale <dsdale24 at gmail.com> wrote:

> I would like to assert that a method accepts certain types. I have a
> short example that works:
>
> from functools import wraps
>
> def accepts(*types):
>     def check_accepts(f):
>         @wraps(f)
>         def new_f(self, other):
>             assert isinstance(other, types), \
>                 "arg %r does not match %s" % (other, types)
>             return f(self, other)
>         return new_f
>     return check_accepts
>
> class Test(object):
>
>     @accepts(int)
>     def check(self, obj):
>         print obj
>
> t = Test()
> t.check(1)
>
> but now I want Test.check to accept an instance of Test as well. Does
> anyone know how this can be accomplished? The following class
> definition for Test raises a NameError:
>
> class Test(object):
>
>     @accepts(int, Test)
>     def check(self, obj):
>         print obj

An icky but relatively clear way to get around this is to gratuitously
subclass Test:

class AcceptableTest(object):
     pass

class Test(AcceptableTest):
     @accepts(int, AcceptableTest)
     def check(self, obj):
         print obj


-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From sidell at gmail.com  Sat Feb 21 01:55:23 2009
From: sidell at gmail.com (jsidell)
Date: Fri, 20 Feb 2009 22:55:23 -0800 (PST)
Subject: Wanted: Online Python Course for Credit
Message-ID: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>

I'm a high school game development teacher and I have recently
discovered Python to be a great way to introduce computer
programming.  I intend to study Python on my own but I can get
professional development credit at my job for taking a Python course.
So I'm looking for an online class that I can get a certificate,
college credit, or something to that effect.  Any suggestions would be
greatly appreciated


From gagsl-py2 at yahoo.com.ar  Sat Feb 21 02:00:29 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 05:00:29 -0200
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
Message-ID: <op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott  
<aaron.hildebrandt at gmail.com> escribi?:

> So, the problem lies with how Python cached the modules in memory.
> Yes, the modules were in two different locations and yes, the one that
> I specified using its direct path should be the one loaded. The
> problem is, the module isn't always loaded -- if it's already in
> memory, it'll use that instead. And since the modules had the same
> name, Python wouldn't distinguish between them, even though they
> weren't exactly the same.

Yes, that's how import works. It's barely documented, and you finally  
learned it the hard way...

> So, loading the module act1/story would load
> act1/story. Then, loading the module act2/story would use the story
> module already in memory. Of course, this made the problem hard to
> pinpoint, since memory is a fickle thing, and the results weren't
> always reproducible.
>
> The final solution? Renaming the 'story' modules to 'story_1' and
> 'story_2'... and importing them via 'exec("from story_"+modulename+"
> import game")'.
>
> Will I go to hell for this 'solution'? Probably. But hey, it means I
> can go home tonight instead of spending all evening at the office
> hitting my head against the wall. I'll come back to it Monday and try
> to figure out a more reasonable solution.

Use packages. Make act1 and act2 packages by creating __init__.py files.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Sat Feb 21 03:37:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 06:37:22 -0200
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
Message-ID: <op.upo0wkz9x6zn5v@gabriel.sleipnir-bsas>

En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.keene at gmail.com>  
escribi?:

> Okay, moving the wx example into the same directory containing the
> first example that was working fixed it. This directory only contains
> these two modules and nothing else. The old directory which contained
> the example that wasn't working did not contain a module with the same
> name as the one I was trying to import, so i don't know why this "fix"
> worked.

Just play safe:

- Don't use "from xxx import *", least from two places at the same time.  
The wx package has a short name on purpose - use "import wx" and then  
wx.Frame, etc.

- Don't play with sys.path if you don't have to; you can put your own  
modules in a place already listed (like Lib\site-packages). Or, use a .pth  
file if you want to add a copmletely separate directory like  
c:\DataFileTypes

-- 
Gabriel Genellina



From alia_khouri at yahoo.com  Sat Feb 21 03:46:08 2009
From: alia_khouri at yahoo.com (Alia Khouri)
Date: Sat, 21 Feb 2009 00:46:08 -0800 (PST)
Subject: python contextmanagers and ruby blocks
Message-ID: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>

As an exercise, I recently translated one of my python scripts (http://
code.activestate.com/recipes/576643/) to haskell (a penultimate
version exists at http://groups.google.com/group/comp.lang.haskell/browse_thread/thread/fb1ebd986b44244e#
in case anyone is interested) with the result that haskell has now
become my second favourite language (after python of course :-)

Just to change mental gears a bit, I'd now like to do the same and
create a ruby version. As I've progressed on the latter, I've been
struck by how pervasive the use of blocks is in ruby. For example:

class Builder
    attr_accessor :name
    def machine &block
        @name = "m1"
        block.call
    end

    def build(x, &block)
        puts x
        block.call
    end
end

builder = Builder.new

builder.machine do
    puts "hello #{builder.name}"
end

builder.build "hello" do
    puts "world"
end

which should print out:
hello m1
hello
world

Now, python's relatively new contextmanagers seem to provide something
similar such that one can write:

from __future__ import with_statement
from contextlib import contextmanager

class Builder:
    @contextmanager
    def machine(self):
        self.name = "m1"
        yield

    @contextmanager
    def build(self, x):
        print x
        yield

builder = Builder()

with builder.machine():
    print 'hello %s' % builder.name

with builder.build("hello"):
    print 'world'

Which brings me to my questions:

1. To what extent are python's contextmanagers similar or equivalent
to ruby's blocks?

2. If there is a gap in power or expressiveness in python's context
managers relative to ruby's blocks, what are possible (syntactic and
non-syntactic) proposals to bridge this gap?

Thank you for your responses.

AK


From gagsl-py2 at yahoo.com.ar  Sat Feb 21 03:47:33 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 21 Feb 2009 06:47:33 -0200
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>
Message-ID: <op.upo1djgjx6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 01:14:02 -0200, odeits <odeits at gmail.com> escribi?:
> On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:

>> It seems what you are actually testing for is if the intersection of
>> the two sets is not empty where the first set is the characters in
>> your word and the second set is the characters in your defined string.
>
> To expand on what I was saying I thought i should provide a code
> snippet:
>
> WORD = 'g' * 100
> WORD2 = 'g' * 50 + 'U'
> VOWELS = 'aeiouAEIOU'
> BIGWORD = 'g' * 10000 + 'U'
>
> def set_test(vowels, word):
>
>     vowels = set( iter(vowels))
>     letters = set( iter(word) )
>
>     if letters & vowels:
>         return True
>     else:
>         return False
>
> with python 2.5 I got 1.30 usec/pass against the BIGWORD

You could make it slightly faster by removing the iter() call: letters =  
set(word)
And (if vowels are really constant) you could pre-build the vowels set.

-- 
Gabriel Genellina



From aisaac at american.edu  Sat Feb 21 04:07:25 2009
From: aisaac at american.edu (Alan Isaac)
Date: Sat, 21 Feb 2009 09:07:25 GMT
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <mailman.380.1235165226.11746.python-list@python.org>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
	<mailman.380.1235165226.11746.python-list@python.org>
Message-ID: <hvPnl.737$tw4.287@nwrddc01.gnilink.net>

Terry Reedy wrote: 
> You are now describing a function closure.  Here is an example that 
> might help.


It does.
Thanks,
Alan


From aisaac at american.edu  Sat Feb 21 04:15:25 2009
From: aisaac at american.edu (Alan Isaac)
Date: Sat, 21 Feb 2009 09:15:25 GMT
Subject: function factory question: embed current values of object
	attributes
In-Reply-To: <mailman.405.1235191954.11746.python-list@python.org>
References: <RWCnl.602$Ez6.367@nwrddc02.gnilink.net>
	<mailman.405.1235191954.11746.python-list@python.org>
Message-ID: <NCPnl.738$tw4.734@nwrddc01.gnilink.net>

Gabriel Genellina wrote: 
> If you want a "frozen" function (that is, a function already set-up with  
> the parameters taken from the current values of x.a, x.b) use  
> functools.partial:


OK, that's also a nice idea.
Thanks!
Alan


From martin at v.loewis.de  Sat Feb 21 04:15:39 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 10:15:39 +0100
Subject: Using clock() in threading on Windows
In-Reply-To: <mailman.389.1235175307.11746.python-list@python.org>
References: <mailman.389.1235175307.11746.python-list@python.org>
Message-ID: <499fc63c$0$30913$9b622d9e@news.freenet.de>

> Would it not be better to use time.clock() instead? 

If you really want to reconsider this implementation, I think it
would be best to use relative timeouts all the way down to the
system. In the specific case of Windows, WaitForSingleObject
expects a relative number of milliseconds (i.e. a wait duration).
As this is also what the Python script passes (in seconds),
it is best to leave issues of timer resolution to the operating
system (which we have to trust anyway).

As a consequence, the half-busy loops could go away, at least
on systems where lock timeouts can be given to the system.

Regards,
Martin


From intelliminer at gmail.com  Sat Feb 21 04:35:14 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 01:35:14 -0800 (PST)
Subject: Python dictionary size/entry limit?
Message-ID: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>

I wrote a script to process textual data and extract phrases from
them, storing these phrases in a dictionary. It encounters a
MemoryError when there are about 11.18M keys in the dictionary, and
the size is about 1.5GB. I tried multiple times, and the error occurs
everytime at exactly the same place (with the same number of keys in
the dict). I then split the dictionary into two using a simple
algorithm:

if str[0]<='m':
    dict=dict1
else:
    dict=dict2

#use dict...

And it worked fine. The total size of the two dictionaries well
exceeded 2GB yet no MemoryError occured.

I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
the size or number of entries that a single dictionary can possess? By
searching on the web I can't find a clue why this problem occurs.


From tino at wildenhain.de  Sat Feb 21 05:25:28 2009
From: tino at wildenhain.de (Tino Wildenhain)
Date: Sat, 21 Feb 2009 11:25:28 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <499FD698.9040606@wildenhain.de>

intelliminer at gmail.com wrote:
> I wrote a script to process textual data and extract phrases from
> them, storing these phrases in a dictionary. It encounters a
> MemoryError when there are about 11.18M keys in the dictionary, and
> the size is about 1.5GB. I tried multiple times, and the error occurs
> everytime at exactly the same place (with the same number of keys in
> the dict). I then split the dictionary into two using a simple
> algorithm:
> 
> if str[0]<='m':
>     dict=dict1
> else:
>     dict=dict2
> 
> #use dict...
> 
> And it worked fine. The total size of the two dictionaries well
> exceeded 2GB yet no MemoryError occured.
> 
> I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> the size or number of entries that a single dictionary can possess? By
> searching on the web I can't find a clue why this problem occurs.

 From what can be deducted from the headers of your message:
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1;...
you are using windows?
It seems either python or windows memory management somehow prevent
the use of continuous memory areas that large.
We've got such an example somewhere down the list which was similar
(iirc it was a large string in memory) which runned perfectly
with linux. You can try yourself maybe by installing ubuntu
on the same host. (If you feel fit you can even skip the install
and run it off life CD but then you need to fiddle a little to
get swap space on disk)

Regards
Tino



> --
> http://mail.python.org/mailman/listinfo/python-list

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From intelliminer at gmail.com  Sat Feb 21 05:45:39 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 02:45:39 -0800 (PST)
Subject: Python dictionary size/entry limit?
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<mailman.410.1235211943.11746.python-list@python.org>
Message-ID: <0823e6c0-ed69-4dfe-85aa-286631b9bbee@i15g2000pro.googlegroups.com>

On Feb 21, 6:25?pm, Tino Wildenhain <t... at wildenhain.de> wrote:
> intellimi... at gmail.com wrote:
> > I wrote a script to process textual data and extract phrases from
> > them, storing these phrases in a dictionary. It encounters a
> > MemoryError when there are about 11.18M keys in the dictionary, and
> > the size is about 1.5GB. I tried multiple times, and the error occurs
> > everytime at exactly the same place (with the same number of keys in
> > the dict). I then split the dictionary into two using a simple
> > algorithm:
>
> > if str[0]<='m':
> > ? ? dict=dict1
> > else:
> > ? ? dict=dict2
>
> > #use dict...
>
> > And it worked fine. The total size of the two dictionaries well
> > exceeded 2GB yet no MemoryError occured.
>
> > I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> > the size or number of entries that a single dictionary can possess? By
> > searching on the web I can't find a clue why this problem occurs.
>
> ?From what can be deducted from the headers of your message:
> X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1;...
> you are using windows?
> It seems either python or windows memory management somehow prevent
> the use of continuous memory areas that large.
> We've got such an example somewhere down the list which was similar
> (iirc it was a large string in memory) which runned perfectly
> with linux. You can try yourself maybe by installing ubuntu
> on the same host. (If you feel fit you can even skip the install
> and run it off life CD but then you need to fiddle a little to
> get swap space on disk)
>
> Regards
> Tino
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>
>
> ?smime.p7s
> 4KViewDownload

Yes, it's winxp, I forgot to mention it.
Thanks for the reply.


From stefan_ml at behnel.de  Sat Feb 21 05:47:10 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 11:47:10 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>

intelliminer at gmail.com wrote:
> I wrote a script to process textual data and extract phrases from
> them, storing these phrases in a dictionary. It encounters a
> MemoryError when there are about 11.18M keys in the dictionary, and
> the size is about 1.5GB.
> [...]
> I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> the size or number of entries that a single dictionary can possess? By
> searching on the web I can't find a clue why this problem occurs.

Python dicts are only limited by what your OS returns as free memory.
However, when a dict grows, it needs to resize, which means that it has to
create a bigger copy of itself and redistribute the keys. For a dict that
is already 1.5GB big, this can temporarily eat a lot more memory than you
have, at least more than two times as much as the size of the dict itself.

You may be better served with one of the dbm databases that come with
Python. They live on-disk but do the usual in-memory caching. They'll
likely perform a lot better than your OS level swap file.

Stefan


From bockman at virgilio.it  Sat Feb 21 06:00:56 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Sat, 21 Feb 2009 12:00:56 +0100
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.21.11.00.48.261043@virgilio.it>

On Sat, 21 Feb 2009 00:46:08 -0800, Alia Khouri wrote:

> As an exercise, I recently translated one of my python scripts (http://
> code.activestate.com/recipes/576643/) to haskell (a penultimate
> version exists at http://groups.google.com/group/comp.lang.haskell/browse_thread/thread/fb1ebd986b44244e#
> in case anyone is interested) with the result that haskell has now
> become my second favourite language (after python of course :-)
> 
> Just to change mental gears a bit, I'd now like to do the same and
> create a ruby version. As I've progressed on the latter, I've been
> struck by how pervasive the use of blocks is in ruby. For example:
>

... ruby code that shows the most twisted 'Hellow world' example I have
ever seen :-) ...

 
> 
> Now, python's relatively new contextmanagers seem to provide something
> similar such that one can write:
> 

... python code doing the same thing - apparently - 
of prevous ruby code, using context managers in a way that I believe the
authors of contextlib module never thought of.


> 
> Which brings me to my questions:
> 
> 1. To what extent are python's contextmanagers similar or equivalent
> to ruby's blocks?
> 

ASAIK, context managers are nothing like ruby blocks.
Context managers have a very specific purpose : to make people able to
abstract the code that one writes to 'enter a context'
(i.e. open a file, start a transaction, ... ) and 'leave a context'
(i.e. close a file, commit or rollback the transaction ... ).
So that you can separate context handling code from the code that performs
actions insed that context, factoring out the first for reuse and better
code maintenance.

Ruby blocks are blocks of code which can be passed as
objects for a number of different usage - for instance to make context
management stuff. If I have to compare them to something in Python, I
would say they are 'lambda on steroids' or 'nameless functions'. And -
personally - I don't like them just as I don't like lambdas in python for
anything but one-liners and I don't like anonymous functions in haskell
(which I am painfully trying to learn ). They may be cool to write, but
they look not very readable to me - but maybe this is just me.

Ciao
----
FB  


 


Ruby blocks - for the little I know of ruby - are anonymous block of
codes


> 2. If there is a gap in power or expressiveness in python's context
> managers relative to ruby's blocks, what are possible (syntactic and
> non-syntactic) proposals to bridge this gap?
> 
> Thank you for your responses.
> 
> AK



From alia_khouri at yahoo.com  Sat Feb 21 08:20:51 2009
From: alia_khouri at yahoo.com (Alia K)
Date: Sat, 21 Feb 2009 05:20:51 -0800 (PST)
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
Message-ID: <aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>

Francesco wrote:

> ... ruby code that shows the most twisted 'Hellow world' example I have
> ever seen :-) ...

and I was gunning for the simplest possible example (-:


> ... python code doing the same thing - apparently -
> of prevous ruby code, using context managers in a way that I believe the
> authors of contextlib module never thought of.

Methinks they probably thought of such usage.

> > 1. To what extent are python's contextmanagers similar or equivalent
> > to ruby's blocks?

> ASAIK, context managers are nothing like ruby blocks.
> Context managers have a very specific purpose : to make people able to
> abstract the code that one writes to 'enter a context'
> (i.e. open a file, start a transaction, ... ) and 'leave a context'
> (i.e. close a file, commit or rollback the transaction ... ).
> So that you can separate context handling code from the code that performs
> actions insed that context, factoring out the first for reuse and better
> code maintenance.

Thinking about it: I suppose one could say in python a contextmanager
defines the functional context of a block of code and makes it a first
class construct in the language, whereas in ruby the block itself is a
first class citizen -- contextmanagers are like the inverse of blocks.

> Ruby blocks are blocks of code which can be passed as
> objects for a number of different usage - for instance to make context
> management stuff. If I have to compare them to something in Python, I
> would say they are 'lambda on steroids' or 'nameless functions'.

Agreed, but also they are more tightly integrated e.g. the &block
construct which can be passed into functions...

> personally - I don't like them just as I don't like lambdas in python for
> anything but one-liners and I don't like anonymous functions in haskell
> (which I am painfully trying to learn ). They may be cool to write, but
> they look not very readable to me - but maybe this is just me.

In case you are learning haskell, here are some excellent guides
(order is important) :

* Learn you a haskell: http://learnyouahaskell.com/chapters
* Real World Haskell: http://book.realworldhaskell.org/
* Typeclassopedia: http://byorgey.wordpress.com/2009/02/16/the-typeclassopedia-request-for-feedback/

(I'm personally still scratching the surface of it all...)

back to the subject...

I suppose because contextmanagers (indeed decorators) are so
relatively new to python, it will probably take a little while for
these constructs to comprehensively penetrate the stdlib. It's already
happened with files, locks, and db transactions but I'm sure there are
many instances where one could benefit from using the with statement.

Nevertheless, I remain curious about whether once can use the
contextmanager in python to achieve the full power of ruby's blocks...

Best,

AK



From mailinglists at vanwingerde.net  Sat Feb 21 08:35:05 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 14:35:05 +0100
Subject: TypeError: descriptor 'replace' requires a 'str' object but received
	a 'unicode'
Message-ID: <49A00309.5030505@vanwingerde.net>

# -*- coding: utf_8 -*-
Omschrijving = u'priv? assuranti?n' # string from a bank.csv
Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
print Omschrijving

When I run this script I get the following message.

"Traceback (most recent call last):
   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
TypeError: descriptor 'replace' requires a 'str' object but received a 
'unicode'"

How can I solve this?




-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net
web: http://jaap.vanwingerde.net/


From stefan_ml at behnel.de  Sat Feb 21 08:55:54 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 14:55:54 +0100
Subject: TypeError: descriptor 'replace' requires a 'str' object but
	received a 'unicode'
In-Reply-To: <mailman.412.1235223310.11746.python-list@python.org>
References: <mailman.412.1235223310.11746.python-list@python.org>
Message-ID: <49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>

Jaap van Wingerde wrote:
> # -*- coding: utf_8 -*-
> Omschrijving = u'priv? assuranti?n' # string from a bank.csv
> Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
> print Omschrijving
> 
> When I run this script I get the following message.
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
>     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> TypeError: descriptor 'replace' requires a 'str' object but received a
> 'unicode'"
> 
> How can I solve this?

By using unicode.replace() instead of str.replace(), i.e.

	Omschrijving = Omschrijving.replace("priv?", 'priv?')

Stefan


From mailinglists at vanwingerde.net  Sat Feb 21 09:43:37 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 15:43:37 +0100
Subject: ordinal not in range
In-Reply-To: <49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
References: <mailman.412.1235223310.11746.python-list@python.org>
	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49A01319.306@vanwingerde.net>

Stefan Behnel wrote:
> 	Omschrijving = Omschrijving.replace("priv?", 'priv?')

I Thank you, this works now, but I get a new error message.

....
import codecs
file = "postbank.csv"
output = "%s.eb" % file
outfile = codecs.open(output, "w", "utf_8")
Omschrijving = u'priv? assuranti?n' # string from postbank.csv
Omschrijving = Omschrijving.replace("priv?", 'priv?')
Omschrijving = Omschrijving.replace("Assuranti?n", 'Assuranti?n')
outfile.write (Omschrijving)

"Traceback (most recent call last):
   File "/home/jaap/Desktop/unicode.py", line 9, in <module>
     outfile.write (Omschrijving)
   File "/usr/lib/python2.5/codecs.py", line 638, in write
     return self.writer.write(data)
   File "/usr/lib/python2.5/codecs.py", line 303, in write
     data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4: 
ordinal not in range(128)"







From aahz at pythoncraft.com  Sat Feb 21 09:59:48 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 06:59:48 -0800
Subject: Uploading big files wit cherrypy
References: <366595b2-226c-48e4-961d-85bd0ce4bd9a@h16g2000yqj.googlegroups.com>
Message-ID: <gnp4t4$86h$1@panix3.panix.com>

In article <366595b2-226c-48e4-961d-85bd0ce4bd9a at h16g2000yqj.googlegroups.com>,
Farsheed Ashouri  <rodmena.com at gmail.com> wrote:
>
>But I couldn't upload files bigger than 100Mb.  Why and what is
>workaround?

What happens when you upload a file larger than 100MB?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From stefan_ml at behnel.de  Sat Feb 21 10:00:41 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 21 Feb 2009 16:00:41 +0100
Subject: ordinal not in range
In-Reply-To: <mailman.413.1235227420.11746.python-list@python.org>
References: <mailman.412.1235223310.11746.python-list@python.org>	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>
	<mailman.413.1235227420.11746.python-list@python.org>
Message-ID: <49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>

Jaap van Wingerde wrote:
> Stefan Behnel wrote:
>>     Omschrijving = Omschrijving.replace("priv?", 'priv?')

actually, make that

	Omschrijving = Omschrijving.replace(u"priv?", u'priv?')

(mind the u"...")


> ....
> import codecs
> file = "postbank.csv"
> output = "%s.eb" % file
> outfile = codecs.open(output, "w", "utf_8")
> Omschrijving = u'priv? assuranti?n' # string from postbank.csv
> Omschrijving = Omschrijving.replace("priv?", 'priv?')
> Omschrijving = Omschrijving.replace("Assuranti?n", 'Assuranti?n')

I guess you mixed up the case here.


> outfile.write (Omschrijving)
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 9, in <module>
>     outfile.write (Omschrijving)
>   File "/usr/lib/python2.5/codecs.py", line 638, in write
>     return self.writer.write(data)
>   File "/usr/lib/python2.5/codecs.py", line 303, in write
>     data, consumed = self.encode(object, self.errors)
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4:
> ordinal not in range(128)"

Does this help?

	outfile = codecs.open(output, "wb", encoding="UTF-8")

(mind the "wb" for 'write binary/bytes')

Looks like you'd be happier with Python 3.0, BTW...

Stefan


From wnewbery at hotmail.co.uk  Sat Feb 21 10:01:16 2009
From: wnewbery at hotmail.co.uk (William Newbery)
Date: Sat, 21 Feb 2009 15:01:16 +0000
Subject: Python C-API Object Allocation
Message-ID: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>


Ive been learning the C-API lately so I can write python extensions for some of my c++ stuff.

I want to use the new and delete operators for creating and destroying my objects.

The problem is python seems to break it into several stages. tp_new, tp_init and tp_alloc for creation and tp_del, tp_free and tp_dealloc for destruction. However c++ just has new which allocates and fully constructs the object and delete which destructs and deallocates the object.


Which of the python tp_* methods do I need to provide and what must they do to be compatible with python subclassing.

Also I want to be able to create the object directly in c++ eg "PyObject *obj = new MyExtensionObject(args);"



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From steve at holdenweb.com  Sat Feb 21 10:01:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 10:01:30 -0500
Subject: "Byte" type?
In-Reply-To: <499f8a8e$0$1588$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
Message-ID: <gnp50i$up5$1@ger.gmane.org>

John Nagle wrote:
> Steve Holden wrote:
>> John Nagle wrote:
>>> Benjamin Kaplan wrote:
>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>>
> ...Re "bytes" not behaving as documented in 2.6:
> 
>>>    That's indeed how Python 2.6 works.  But that's not how
>>> PEP 3137 says it's supposed to work.
>>>
>>> Guido:
>>>
>>>  "I propose the following type names at the Python level:
>>>
>>>         * bytes is an immutable array of bytes (PyString)
>>>         * bytearray is a mutable array of bytes (PyBytes)"
> ...
>>> (Not true in Python 2.6
>>> Is this a bug, a feature, a documentation error, or bad design?
>>>
>> It's a feature. In fact all that was done to accommodate easier
>> migration to 3.x is easily shown in one statement:
>>
>>>>> str is bytes
>> True
>>
>> So that's why bytes works the way it does in 2.6 ... hence my contested
>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>> I think "hack" could still be held to apply.
> 
>    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
> 
>    The way it works in 2.6 makes it necessary to do "ord" conversions
> where they shouldn't be required.
> 
Yes, the hack was to achieve a modicum of compatibility with 3.0 without
having to turn the world upside down.

I haven't used 3.0 enough the say whether bytearray has been correctly
implemented. But I believe the intention is that 3.0 should fully
implement PEP 3137.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From aahz at pythoncraft.com  Sat Feb 21 10:01:38 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 07:01:38 -0800
Subject: Change in cgi handling of POST requests
References: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>
Message-ID: <gnp50i$i24$1@panix3.panix.com>

[posted & e-mailed]

In article <e230c5e2-1d7c-4258-8cc0-d78da6304e4e at 13g2000yql.googlegroups.com>,
Mac  <bob.uuca at gmail.com> wrote:
>
>We just upgraded Python to 2.6 on some of our servers and a number of
>our CGI scripts broke because the cgi module has changed the way it
>handles POST requests.  When the 'action' attribute was not present in
>the form element on an HTML page the module behaved as if the value of
>the attribute was the URL which brought the user to the page with the
>form, but without the query (?x=y...) part.  Now FieldStorage.getvalue
>() is giving the script a list of two copies of the value for some of
>the parameters (folding in the parameters from the previous request)
>instead of the single string it used to return for each.  I searched
>this newsgroup looking for a discussion of the proposal to impose this
>change of behavior, and perhaps I wasn't using the right phrases in my
>search, but I didn't find anything.  

Interesting.  Nobody has responded, so I suggest first filing a report
using bugs.python.org and then asking on python-dev (with reference to
your report).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From steve at holdenweb.com  Sat Feb 21 10:27:54 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 10:27:54 -0500
Subject: TypeError: descriptor 'replace' requires a 'str' object but
	received a 'unicode'
In-Reply-To: <49A00309.5030505@vanwingerde.net>
References: <49A00309.5030505@vanwingerde.net>
Message-ID: <gnp6i2$4bo$1@ger.gmane.org>

Jaap van Wingerde wrote:
> # -*- coding: utf_8 -*-
> Omschrijving = u'priv? assuranti?n' # string from a bank.csv
> Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> Omschrijving = str.replace(Omschrijving, "Assuranti?n", 'Assuranti?n')
> print Omschrijving
> 
> When I run this script I get the following message.
> 
> "Traceback (most recent call last):
>   File "/home/jaap/Desktop/unicode.py", line 3, in <module>
>     Omschrijving = str.replace(Omschrijving, "priv?", 'priv?')
> TypeError: descriptor 'replace' requires a 'str' object but received a
> 'unicode'"
> 
> How can I solve this?
> 

First of all, use the methods of the unicode type, not the str type.
Secondly, call the methods on an instance, not on the type (the instance
is passed automatically). Thirdly, use Unicode arguments to replace.

Omschrijving = u'priv? assuranti?n' # string from a bank.csv
Omschrijving = Omschrijving.replace(u"priv?", u'priv?')
Omschrijving = Omschrijving.replace(u"assuranti?n", u'assuranti?n')
print Omschrijving

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mailinglists at vanwingerde.net  Sat Feb 21 11:16:58 2009
From: mailinglists at vanwingerde.net (Jaap van Wingerde)
Date: Sat, 21 Feb 2009 17:16:58 +0100
Subject: ordinal not in range
In-Reply-To: <49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>
References: <mailman.412.1235223310.11746.python-list@python.org>	<49a007ea$0$30236$9b4e6d93@newsspool1.arcor-online.net>	<mailman.413.1235227420.11746.python-list@python.org>
	<49a01719$0$30224$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49A028FA.90901@vanwingerde.net>

Stefan Behnel wrote:
> 	Omschrijving = Omschrijving.replace(u"priv?", u'priv?')
> (mind the u"...")
> 	outfile = codecs.open(output, "wb", encoding="UTF-8")
> (mind the "wb" for 'write binary/bytes')
It works now!

> Looks like you'd be happier with Python 3.0, BTW...
Python 3 is not in Debian Lenny.

With your help I made my first Python-script. This script saves me from
hours dumb work.

Thanks a lot!!




-- 
Jaap van Wingerde
e-mail: 1234567890 at vanwingerde.net




From Scott.Daniels at Acm.Org  Sat Feb 21 11:49:09 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 21 Feb 2009 08:49:09 -0800
Subject: how to assert that method accepts specific types
In-Reply-To: <mailman.406.1235197516.11746.python-list@python.org>
References: <3f26a2f1-94cf-4083-9bda-7076959ad784@k19g2000yqg.googlegroups.com>
	<mailman.406.1235197516.11746.python-list@python.org>
Message-ID: <QbSdnaSE-qpusj3UnZ2dnUVZ_rbinZ2d@pdx.net>

Rhodri James wrote:
> On Sat, 21 Feb 2009 01:12:01 -0000, Darren Dale <dsdale24 at gmail.com> wrote:
>> I would like to assert that a method accepts certain types....
>>     from functools import wraps
>>     def accepts(*types):
>>         def check_accepts(f): ...
>>     class Test(object):
>>         @accepts(int)
>>         def check(self, obj):
>>             print obj
>> but now I want Test.check to accept an instance of Test as well....
> 
> An icky but relatively clear way to get around this is to gratuitously
> subclass Test:
> class AcceptableTest(object):
>     pass
> 
> class Test(AcceptableTest):
>     @accepts(int, AcceptableTest)
>     def check(self, obj):
>         print obj

To Increase the ick, but lowering the name pollution
(while making the _source_ read more clearly):

     class Test(<Test base classes>):
         pass # Just a placeholder for type checking

     class Test(Test):
         @accepts(int, Test)
         def check(self, obj):
             print obj


--Scott David Daniels
Scott.Daniels at Acm.Org


From rdmurray at bitdance.com  Sat Feb 21 11:51:40 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 21 Feb 2009 16:51:40 +0000 (UTC)
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnpbes$ics$1@ger.gmane.org>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
> <aaron.hildebrandt at gmail.com> escribi=F3:
> 
> > So, the problem lies with how Python cached the modules in memory.
> > Yes, the modules were in two different locations and yes, the one that
> > I specified using its direct path should be the one loaded. The
> > problem is, the module isn't always loaded -- if it's already in
> > memory, it'll use that instead. And since the modules had the same
> > name, Python wouldn't distinguish between them, even though they
> > weren't exactly the same.
> 
> Yes, that's how import works. It's barely documented, and you finally
> learned it the hard way...

I'd argue a little bit with "barely documented".  In the reference, the
discussion of the import statement starts off saying:

    Import statements are executed in two steps: (1) find a module,
    and initialize it if necessary; (2) define a name or names in the
    local namespace (of the scope where the import statement occurs).

The third paragraph then says:

    The system maintains a table of modules that have been or are being
    initialized, indexed by module name. This table is accessible as
    sys.modules. When a module name is found in this table, step (1)
    is finished.

That is pretty up front and unambiguous documentation.

However, the consequences of that statement won't be immediately clear
on first reading.  I think it would have cleared up Aaron's confusion
if he'd happened to think to read it.  But since he knew the syntax
of the import statement already, I'm not surprised he did not read it.

The Tutorial, in the section on modules and import, says:

    A module can contain executable statements as well as function
    definitions. These statements are intended to initialize the
    module. They are executed only the first time the module is imported
    somewhere.

This is considerably less precise, if more superficially understandable.
I wonder if it would be worth expanding on that statement to mention
that the module is not even looked for on disk if a module by that
name has already been imported.

--RDM



From Scott.Daniels at Acm.Org  Sat Feb 21 12:07:42 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 21 Feb 2009 09:07:42 -0800
Subject: Wanted: Online Python Course for Credit
In-Reply-To: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
References: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
Message-ID: <HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>

jsidell wrote:
> I'm a high school game development teacher and I have recently
> discovered Python to be a great way to introduce computer
> programming.  I intend to study Python on my own but I can get
> professional development credit at my job for taking a Python course.
> So I'm looking for an online class that I can get a certificate,
> college credit, or something to that effect.  Any suggestions would be
> greatly appreciated

I'd strongly suggest going to PyCon, (sign up for tutorials as well):
     http://us.pycon.org/2009/about/
I know, you want on-line, but the chance to meet with a group of others,
and this PyCon will likely have the best collection of teachers and
Python.

for example, There is a tutorial:
     Python for Teachers (Urner/Holden)

Also two strongly relevant sections in the scheduled talks:
8.  Learning and Teaching Python Programming: The Crunchy Way
     Dr. Andr? Roberge
88.  Seven ways to use Python's new turtle module
     Mr. Gregor Lingl

But make no mistake, you need to mingle when you are there to get the
inspiration you'll want.

--Scott David Daniels
Scott.Daniels at Acm.Org


From nagle at animats.com  Sat Feb 21 12:21:41 2009
From: nagle at animats.com (John Nagle)
Date: Sat, 21 Feb 2009 09:21:41 -0800
Subject: "Byte" type?
In-Reply-To: <mailman.414.1235228520.11746.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
Message-ID: <49a03081$0$1599$742ec2ed@news.sonic.net>

Steve Holden wrote:
> John Nagle wrote:
>> Steve Holden wrote:
>>> John Nagle wrote:
>>>> Benjamin Kaplan wrote:
>>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com> wrote:
>>>>>
>> ...Re "bytes" not behaving as documented in 2.6:
>>
>>>>    That's indeed how Python 2.6 works.  But that's not how
>>>> PEP 3137 says it's supposed to work.
>>>>
>>>> Guido:
>>>>
>>>>  "I propose the following type names at the Python level:
>>>>
>>>>         * bytes is an immutable array of bytes (PyString)
>>>>         * bytearray is a mutable array of bytes (PyBytes)"
>> ...
>>>> (Not true in Python 2.6
>>>> Is this a bug, a feature, a documentation error, or bad design?
>>>>
>>> It's a feature. In fact all that was done to accommodate easier
>>> migration to 3.x is easily shown in one statement:
>>>
>>>>>> str is bytes
>>> True
>>>
>>> So that's why bytes works the way it does in 2.6 ... hence my contested
>>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>>> I think "hack" could still be held to apply.
>>    Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
>> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
>>
>>    The way it works in 2.6 makes it necessary to do "ord" conversions
>> where they shouldn't be required.
>>
> Yes, the hack was to achieve a modicum of compatibility with 3.0 without
> having to turn the world upside down.
> 
> I haven't used 3.0 enough the say whether bytearray has been correctly
> implemented. But I believe the intention is that 3.0 should fully
> implement PEP 3137.

    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was really
dumb.  There's no old code using "bytes".  So converting code to 2.6 means
it has to be converted AGAIN for 3.0.  That's a good reason to ignore 2.6 as
defective.

					John Nagle


From rridge at csclub.uwaterloo.ca  Sat Feb 21 12:22:36 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 12:22:36 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de>
Message-ID: <gnpd8s$pm9$1@rumours.uwaterloo.ca>

=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=  <martin at v.loewis.de> wrote:
>I don't think that was the complaint. Instead, the complaint was
>that the OP's original message did not have a Content-type header,
>and that it was thus impossible to tell what the byte in front of
>"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
>MU in a usenet or email message, you really must use MIME. (As both
>your article and Thorsten's did, by choosing UTF-8)

MIME only applies Internet e-mail messages.  RFC 1036 doesn't require
nor give a meaning to a Content-Type header in a Usenet message, so
there's nothing wrong with the original poster's newsreader.

In any case what the original poster really should do is come up with
a better name for his program

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From aahz at pythoncraft.com  Sat Feb 21 12:42:02 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:42:02 -0800
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
Message-ID: <gnpeda$4tp$1@panix3.panix.com>

In article <aac004f8-2077-4e53-a865-47c24f7f523a at t3g2000yqa.googlegroups.com>,
Alia K  <alia_khouri at yahoo.com> wrote:
>
>Nevertheless, I remain curious about whether once can use the
>contextmanager in python to achieve the full power of ruby's blocks...

Short answer: no

Longer answer: the way in Python to achieve the full power of Ruby
blocks is to write a function.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From lists at cheimes.de  Sat Feb 21 12:42:27 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 21 Feb 2009 18:42:27 +0100
Subject: "Byte" type?
In-Reply-To: <49a03081$0$1599$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net>
Message-ID: <gnpee3$r69$1@ger.gmane.org>

John Nagle wrote
>    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> really
> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> it has to be converted AGAIN for 3.0.  That's a good reason to ignore
> 2.6 as
> defective.

Please don't call something dumb that you don't fully understand. It's
offenses the people who have spent lots of time developing Python --
personal, unpaid and voluntary time!
I can assure, the bytes alias and b'' alias have their right to exist.

Christian



From aahz at pythoncraft.com  Sat Feb 21 12:45:25 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:45:25 -0800
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<pan.2009.02.10.21.58.36@REMOVE.THIS.cybersource.com.au>
	<gnmrgj$ltv$1@panix3.panix.com>
	<hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d@posted.visi>
Message-ID: <gnpejl$lq3$1@panix3.panix.com>

In article <hfWdnTzVR8UNnwLUnZ2dnUVZ_uOWnZ2d at posted.visi>,
Grant Edwards  <invalid at invalid> wrote:
>On 2009-02-20, Aahz <aahz at pythoncraft.com> wrote:
>> Steven D'Aprano  <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>>
>>> As I understand it, there's very little benefit to multi-cores in
>>> Python due to the GIL.
>>
>> As phrased, your statement is completely wrong.  Here's a more
>> correct phrasing: "For threaded compute-bound applications written
>> in pure Python, there's very little benefit to multiple cores." But
>> threaded I/O-bound applications do receive some benefit from multiple
>> cores, and using multiple processes certainly leverages multiple
>> cores.  If boosting the performance of a threaded compute-bound
>> application is important, one can always write the critical parts in
>> C/C++.
>
>Do the crunchy bits of scipy/numpy, scientific python, vtk and other
>compute-intensive libraries tend to release the GIL while they're busy
>"computing"?
>
>[Perhaps using them doesn't count as "pure Python", but...]

They definitely do not count as pure Python -- but I probably should have
mentioned that there are pre-existing libraries that can be used.  It's
just that I/O is about the only area where there is a concerted effort to
ensure that GIL gets released.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From aahz at pythoncraft.com  Sat Feb 21 12:48:21 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 09:48:21 -0800
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <gnpep5$194$1@panix3.panix.com>

In article <499F397C.7030404 at v.loewis.de>,
=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?=  <martin at v.loewis.de> wrote:
>> Yes, I know that.  But every concrete representation of a unicode string 
>> has to have an encoding associated with it, including unicode strings 
>> produced by the Python parser when it parses the ascii string "u'\xb5'"
>> 
>> My question is: what is that encoding?
>
>The internal representation is either UTF-16, or UTF-32; which one is
>a compile-time choice (i.e. when the Python interpreter is built).

Wait, I thought it was UCS-2 or UCS-4?  Or am I misremembering the
countless threads about the distinction between UTF and UCS?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From thorsten at thorstenkampe.de  Sat Feb 21 13:20:12 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 19:20:12 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.24090cad6756ba449897c5@news.individual.de>
	<mailman.373.1235153296.11746.python-list@python.org>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240a64495647d8329897c6@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 12:22:36 -0500)
> =?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=  <martin at v.loewis.de> wrote:
> >I don't think that was the complaint. Instead, the complaint was
> >that the OP's original message did not have a Content-type header,
> >and that it was thus impossible to tell what the byte in front of
> >"Wiki" meant. To properly post either MICRO SIGN or GREEK SMALL LETTER
> >MU in a usenet or email message, you really must use MIME. (As both
> >your article and Thorsten's did, by choosing UTF-8)
> 
> MIME only applies Internet e-mail messages.

No, it doesn't: "MIME's use, however, has grown beyond describing the 
content of e-mail to describing content type in general. [...]

The content types defined by MIME standards are also of importance 
outside of e-mail, such as in communication protocols like HTTP [...]"

http://en.wikipedia.org/wiki/MIME

> RFC 1036 doesn't require nor give a meaning to a Content-Type header
> in a Usenet message

Well, /maybe/ the reason for that is that RFC 1036 was written in 1987 
and the first MIME RFC in 1992...? The "Son of RFC 1036" mentions MIME 
more often than you can count.

> so there's nothing wrong with the original poster's newsreader.

If you follow RFC 1036 (who was written before anyone even thought of 
MIME) then all content has to ASCII. The OP used non ASCII letters.

It's all about declaring your charset. In Python as well as in your 
newsreader. If you don't declare your charset it's ASCII for you - in 
Python as well as in your newsreader.

Thorsten


From thorsten at thorstenkampe.de  Sat Feb 21 13:24:23 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 19:24:23 +0100
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
Message-ID: <MPG.240a65412c11a5ea9897c7@news.individual.de>

* "Martin v. L?wis" (Sat, 21 Feb 2009 00:15:08 +0100)
> > Yes, I know that. But every concrete representation of a unicode
> > string has to have an encoding associated with it, including unicode
> > strings produced by the Python parser when it parses the ascii
> > string "u'\xb5'"
> > 
> > My question is: what is that encoding?
> 
> The internal representation is either UTF-16, or UTF-32; which one is
> a compile-time choice (i.e. when the Python interpreter is built).

I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a 
slight difference to UTF-16/UTF-32).

Thorsten


From massi_srb at msn.com  Sat Feb 21 13:56:03 2009
From: massi_srb at msn.com (Massi)
Date: Sat, 21 Feb 2009 10:56:03 -0800 (PST)
Subject: Ctypes debug of dll function
Message-ID: <1eef6de3-ebfc-45d5-845d-6345a4563c2e@f3g2000yqf.googlegroups.com>

Hi everyone, I'm pretty new to the ctypes module and I'm encountering
a problem. I'm working under windows xp with python 2.5 and in my
script I use ctypes to call from a dll some functions I wrote in C.
When I call one of these functions it happens that my script crashes
raising the following error:
WindowsError: exception: access violation writing 0x00000000
My question is...is there a way to debug my C function from the dll
while it is run from the python script?
Thanks in advance for the help.


From benjamin.kaplan at case.edu  Sat Feb 21 14:02:19 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 21 Feb 2009 14:02:19 -0500
Subject: "Byte" type?
In-Reply-To: <49a03081$0$1599$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net>
Message-ID: <ec96e1390902211102o7ae5f35cx7f0e5723d3180cd2@mail.gmail.com>

On Sat, Feb 21, 2009 at 12:21 PM, John Nagle <nagle at animats.com> wrote:

> Steve Holden wrote:
>
>> John Nagle wrote:
>>
>>> Steve Holden wrote:
>>>
>>>> John Nagle wrote:
>>>>
>>>>> Benjamin Kaplan wrote:
>>>>>
>>>>>> On Sun, Feb 15, 2009 at 11:57 AM, John Nagle <nagle at animats.com>
>>>>>> wrote:
>>>>>>
>>>>>>  ...Re "bytes" not behaving as documented in 2.6:
>>>
>>>    That's indeed how Python 2.6 works.  But that's not how
>>>>> PEP 3137 says it's supposed to work.
>>>>>
>>>>> Guido:
>>>>>
>>>>>  "I propose the following type names at the Python level:
>>>>>
>>>>>        * bytes is an immutable array of bytes (PyString)
>>>>>        * bytearray is a mutable array of bytes (PyBytes)"
>>>>>
>>>> ...
>>>
>>>> (Not true in Python 2.6
>>>>> Is this a bug, a feature, a documentation error, or bad design?
>>>>>
>>>>>  It's a feature. In fact all that was done to accommodate easier
>>>> migration to 3.x is easily shown in one statement:
>>>>
>>>>  str is bytes
>>>>>>>
>>>>>> True
>>>>
>>>> So that's why bytes works the way it does in 2.6 ... hence my contested
>>>> description of it as an "ugly hack". I am happy to withdraw "ugly", but
>>>> I think "hack" could still be held to apply.
>>>>
>>>   Agreed.  But is this a 2.6 thing, making 2.6 incompatible with 3.0, or
>>> what?  How will 3.x do it?  The PEP 3137 way, or the Python 2.6 way?
>>>
>>>   The way it works in 2.6 makes it necessary to do "ord" conversions
>>> where they shouldn't be required.
>>>
>>>  Yes, the hack was to achieve a modicum of compatibility with 3.0 without
>> having to turn the world upside down.
>>
>> I haven't used 3.0 enough the say whether bytearray has been correctly
>> implemented. But I believe the intention is that 3.0 should fully
>> implement PEP 3137.
>>
>
>   If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> really
> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> it has to be converted AGAIN for 3.0.  That's a good reason to ignore 2.6
> as
> defective.
>

"""

The primary use of bytes in 2.6 will be to write tests of object type such
as isinstance(x, bytes). This will help the 2to3 converter, which can't tell
whether 2.x code intends strings to contain either characters or 8-bit
bytes; you can now use either bytes or
str<http://docs.python.org/library/functions.html#str>to represent
your intention exactly, and the resulting code will also be
correct in Python 3.0.

"""

The reason for putting bytes (a new type, not a keyword) into 2.6 was purely
for use in the 2to3 tool. It is designed to break less code on the
conversion from 2.x to 3.x, not to add extra features to 2.6+.


>
>                                        John Nagle
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bkline at rksystems.com  Sat Feb 21 14:16:12 2009
From: bkline at rksystems.com (Bob Kline)
Date: Sat, 21 Feb 2009 14:16:12 -0500
Subject: Change in cgi handling of POST requests
In-Reply-To: <gnp50i$i24$1@panix3.panix.com>
References: <e230c5e2-1d7c-4258-8cc0-d78da6304e4e@13g2000yql.googlegroups.com>
	<gnp50i$i24$1@panix3.panix.com>
Message-ID: <rJidnTCLMulgzz3UnZ2dnUVZ_vninZ2d@speakeasy.net>

Aahz wrote:

> Interesting.  Nobody has responded, so I suggest first filing a report
> using bugs.python.org and then asking on python-dev (with reference to
> your report).

http://bugs.python.org/issue5340

Cheers,
Bob


From denis.kasak at gmail.com  Sat Feb 21 14:32:10 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 20:32:10 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <MPG.240a65412c11a5ea9897c7@news.individual.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
Message-ID: <39e19a010902211132m39730333vd8d76f334115d206@mail.gmail.com>

On Sat, Feb 21, 2009 at 7:24 PM, Thorsten Kampe
<thorsten at thorstenkampe.de> wrote:
>
> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
> slight difference to UTF-16/UTF-32).

I wouldn't call the difference that slight, especially between UTF-16
and UCS-2, since the former can encode all Unicode code points, while
the latter can only encode those in the BMP.

--
Denis Kasak


From rridge at csclub.uwaterloo.ca  Sat Feb 21 14:52:09 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 14:52:09 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
Message-ID: <gnpm19$rvm$1@rumours.uwaterloo.ca>

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>> RFC 1036 doesn't require nor give a meaning to a Content-Type header
>> in a Usenet message
>
>Well, /maybe/ the reason for that is that RFC 1036 was written in 1987 
>and the first MIME RFC in 1992...?

Obviously.

>"Son of RFC 1036" mentions MIME more often than you can count.

Since it was never sumbitted and accepted, RFC 1036 remains current.

>> so there's nothing wrong with the original poster's newsreader.
>
>If you follow RFC 1036 (who was written before anyone even thought of 
>MIME) then all content has to ASCII. The OP used non ASCII letters.

RFC 1036 doesn't place any restrictions on the content on the body of
an article.  On the other hand "Son of RFC 1036" does have restrictions
on characters used in the body of message:

	Articles MUST not contain any octet with value exceeding 127,
	i.e. any octet that is not an ASCII character

Which means that merely adding a Content-Encoding header wouldn't
be enough to conform to "Son of RFC 1036", the original poster would
also have had to either switch to a 7-bit character set or use a 7-bit
compatible transfer encoding.  If you trying to claim that "Son of RFC
1036" is the new defacto standard, then that would mean your newsreader
is broken too.

>It's all about declaring your charset. In Python as well as in your 
>newsreader. If you don't declare your charset it's ASCII for you - in 
>Python as well as in your newsreader.

Except in practice unlike Python, many newsreaders don't assume ASCII.
The original article displayed fine for me.  Google Groups displays it
correctly too:

	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc

I could just as easily argue that assuming ISO 8859-1 is the defacto
standard, and that its your newsreader that's broken.  The reality however
is that RFC 1036 is the only standard for Usenet messages, defacto or
otherwise, and so there's nothing wrong with anyone's newsreader.

				Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From martin at v.loewis.de  Sat Feb 21 15:06:27 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sat, 21 Feb 2009 21:06:27 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <gnpep5$194$1@panix3.panix.com>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de> <gnpep5$194$1@panix3.panix.com>
Message-ID: <49A05EC3.6080209@v.loewis.de>

>>> My question is: what is that encoding?
>> The internal representation is either UTF-16, or UTF-32; which one is
>> a compile-time choice (i.e. when the Python interpreter is built).
> 
> Wait, I thought it was UCS-2 or UCS-4?  Or am I misremembering the
> countless threads about the distinction between UTF and UCS?

You are not misremembering. I personally never found them conclusive,
and, with PEP 261, I think, calling the 2-byte version "UCS-2" is
incorrect.

Regards,
Martin


From martin at v.loewis.de  Sat Feb 21 15:10:30 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 21:10:30 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <mailman.421.1235244733.11746.python-list@python.org>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>	<499F397C.7030404@v.loewis.de>	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
Message-ID: <49a05fb6$0$30900$9b622d9e@news.freenet.de>

>> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
>> slight difference to UTF-16/UTF-32).
> 
> I wouldn't call the difference that slight, especially between UTF-16
> and UCS-2, since the former can encode all Unicode code points, while
> the latter can only encode those in the BMP.

Indeed. As Python *can* encode all characters even in 2-byte mode
(since PEP 261), it seems clear that Python's Unicode representation
is *not* strictly UCS-2 anymore.

Regards,
Martin


From rozzin at geekspace.com  Sat Feb 21 15:13:26 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 15:13:26 -0500
Subject: `high overhead of multiple Python processes' (was: Will
	multithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
Message-ID: <87mycfczvd.fsf_-_@slice.rozzin.com>

Paul Rubin <http://phr.cx at NOSPAM.invalid> writes:
>
> Right, that's basically the issue here: the cost of using multiple
> Python processes is unnecessarily high.  If that cost were lower then
> we could more easily use multiple cores to make oru apps faster.

What cost is that? At least on unix systems, fork() tends have
*trivial* overhead in terms of both time and space, because the
processes use lazy copy-on-write memory underneath, so the real costs
of resource-consumption for spawning a new process vs. spawning a new
thread should be comparable.

Are you referring to overhead associated with inter-process
communication? If so, what overhead is that?

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From john.weatherwax at gmail.com  Sat Feb 21 15:22:38 2009
From: john.weatherwax at gmail.com (john.weatherwax at gmail.com)
Date: Sat, 21 Feb 2009 12:22:38 -0800 (PST)
Subject: urllib2 login help
Message-ID: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>

Hello,

I'm having trouble using urllib2 (maybe) when trying to log into a web
site that requires a user to enter a login name and a password
(authentication).  I've tried many things but none seem to work and
have become stuck recently and was hoping to get a hint from those
much more knowledgeable than myself.

I want to automate logging on to the investopedia stock simulator web
site.

http://simulator.investopedia.com/authorization/login.aspx

I can't seem to automate this successfully.

My python script is below:

import os,re
import urllib, urllib2

theurl = "http://simulator.investopedia.com/authorization/login.aspx"

post_dict = { "ct100$MainPlaceHolder$usernameText": "XXX",
"ct100$MainPlaceHolder$passwordText": "XXX", "ct100$MainPlaceHolder
$loginButton": "Sign In", "ct100$MainPlaceHolder$rememberMeCheckBox":
"on" }

post_data = urllib.urlencode( post_dict )

headers = { 'User-agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
NT)',
            'Host': 'simulator.investopedia.com',
            'Referer': 'http://simulator.investopedia.com/
authorization/login.aspx',
            }

req = urllib2.Request( theurl, post_data, headers )
response = urllib2.urlopen(req)
the_page = response.read()

The problem is that this page returned seems to be the same as the
login page which I connected to initially.  When I perform the login
process manually things work as expected.  What am I doing
incorrectly?

*ANY* hints/suggestions/directions would be very appreciated since
I've run out of ideas of things to try at this point.

Thanks very much




From denis.kasak at gmail.com  Sat Feb 21 15:24:30 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 21:24:30 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <49a05fb6$0$30900$9b622d9e@news.freenet.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
Message-ID: <39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>

On Sat, Feb 21, 2009 at 9:10 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>>> I'm pretty much sure it is UCS-2 or UCS-4. (Yes, I know there is only a
>>> slight difference to UTF-16/UTF-32).
>>
>> I wouldn't call the difference that slight, especially between UTF-16
>> and UCS-2, since the former can encode all Unicode code points, while
>> the latter can only encode those in the BMP.
>
> Indeed. As Python *can* encode all characters even in 2-byte mode
> (since PEP 261), it seems clear that Python's Unicode representation
> is *not* strictly UCS-2 anymore.

Since we're already discussing this, I'm curious - why was UCS-2
chosen over plain UTF-16 or UTF-8 in the first place for Python's
internal storage?

-- 
Denis Kasak


From apt.shansen at gmail.com  Sat Feb 21 15:36:56 2009
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 21 Feb 2009 12:36:56 -0800
Subject: urllib2 login help
In-Reply-To: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
References: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
Message-ID: <7a9c25c20902211236y28e14833y1e475ea0cc0c9829@mail.gmail.com>

>
> *ANY* hints/suggestions/directions would be very appreciated since
> I've run out of ideas of things to try at this point.
>

The last time I heard something like this, I suggested that the problem
might be cookies -- and it ended up working for the person I believe.

http://groups.google.com/group/comp.lang.python/browse_thread/thread/4d78de927ee1e549

--S
-------------- next part --------------
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From rhamph at gmail.com  Sat Feb 21 15:39:22 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Sat, 21 Feb 2009 12:39:22 -0800 (PST)
Subject: What encoding does u'...' syntax use?
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net> 
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net> 
	<499F397C.7030404@v.loewis.de> <gnpep5$194$1@panix3.panix.com>
Message-ID: <06779757-e822-4cba-adba-69f669acf92c@k19g2000yqg.googlegroups.com>

On Feb 21, 10:48?am, a... at pythoncraft.com (Aahz) wrote:
> In article <499F397C.7030... at v.loewis.de>,
>
> =?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?= ?<mar... at v.loewis.de> wrote:
> >> Yes, I know that. ?But every concrete representation of a unicode string
> >> has to have an encoding associated with it, including unicode strings
> >> produced by the Python parser when it parses the ascii string "u'\xb5'"
>
> >> My question is: what is that encoding?
>
> >The internal representation is either UTF-16, or UTF-32; which one is
> >a compile-time choice (i.e. when the Python interpreter is built).
>
> Wait, I thought it was UCS-2 or UCS-4? ?Or am I misremembering the
> countless threads about the distinction between UTF and UCS?

Nope, that's partly mislabeling and partly a bug.  UCS-2/UCS-4 refer
to Unicode 1.1 and earlier, with no surrogates.  We target Unicode
5.1.

If you naively encode UCS-2 as UTF-8 you really end up with CESU-8.
You miss the step where you combine surrogate pairs (which only exist
in UTF-16) into a single supplementary character.  Lo and behold,
that's actually what current python does in some places.  It's not
pretty.

See bugs #3297 and #3672.


From martin at v.loewis.de  Sat Feb 21 15:45:09 2009
From: martin at v.loewis.de (=?UTF-8?B?Ik1hcnRpbiB2LiBMw7Z3aXMi?=)
Date: Sat, 21 Feb 2009 21:45:09 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>	
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>	
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>	
	<499F397C.7030404@v.loewis.de>	
	<MPG.240a65412c11a5ea9897c7@news.individual.de>	
	<mailman.421.1235244733.11746.python-list@python.org>	
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
	<39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
Message-ID: <49A067D5.9000404@v.loewis.de>

>> Indeed. As Python *can* encode all characters even in 2-byte mode
>> (since PEP 261), it seems clear that Python's Unicode representation
>> is *not* strictly UCS-2 anymore.
> 
> Since we're already discussing this, I'm curious - why was UCS-2
> chosen over plain UTF-16 or UTF-8 in the first place for Python's
> internal storage?

You mean, originally? Originally, the choice was only between UCS-2
and UCS-4; choice was in favor of UCS-2 because of size concerns.
UTF-8 was ruled out easily because it doesn't allow constant-size
indexing; UTF-16 essentially for the same reason (plus there was
no point to UTF-16, since there were no assigned characters outside
the BMP).

Regards,
Martin





From denis.kasak at gmail.com  Sat Feb 21 15:48:05 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sat, 21 Feb 2009 21:48:05 +0100
Subject: What encoding does u'...' syntax use?
In-Reply-To: <49A067D5.9000404@v.loewis.de>
References: <rNOSPAMon-9C9C2D.11484520022009@news.gha.chartermi.net>
	<499f18bd$0$31879$9b4e6d93@newsspool3.arcor-online.net>
	<rNOSPAMon-156F77.13155120022009@news.gha.chartermi.net>
	<499F397C.7030404@v.loewis.de>
	<MPG.240a65412c11a5ea9897c7@news.individual.de>
	<mailman.421.1235244733.11746.python-list@python.org>
	<49a05fb6$0$30900$9b622d9e@news.freenet.de>
	<39e19a010902211224v3f9a28dbt978fed7a5696a510@mail.gmail.com>
	<49A067D5.9000404@v.loewis.de>
Message-ID: <39e19a010902211248h280b4949q7279b88fafe93c62@mail.gmail.com>

On Sat, Feb 21, 2009 at 9:45 PM, "Martin v. L?wis" <martin at v.loewis.de> wrote:
>>> Indeed. As Python *can* encode all characters even in 2-byte mode
>>> (since PEP 261), it seems clear that Python's Unicode representation
>>> is *not* strictly UCS-2 anymore.
>>
>> Since we're already discussing this, I'm curious - why was UCS-2
>> chosen over plain UTF-16 or UTF-8 in the first place for Python's
>> internal storage?
>
> You mean, originally? Originally, the choice was only between UCS-2
> and UCS-4; choice was in favor of UCS-2 because of size concerns.
> UTF-8 was ruled out easily because it doesn't allow constant-size
> indexing; UTF-16 essentially for the same reason (plus there was
> no point to UTF-16, since there were no assigned characters outside
> the BMP).

Yes, I failed to realise how long ago the unicode data type was
implemented originally. :-)
Thanks for the explanation.

-- 
Denis Kasak


From thorsten at thorstenkampe.de  Sat Feb 21 16:05:39 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 22:05:39 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240a8b0f8b7d32969897c8@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>> It's all about declaring your charset. In Python as well as in your
>> newsreader. If you don't declare your charset it's ASCII for you - in
>> Python as well as in your newsreader.
> 
> Except in practice unlike Python, many newsreaders don't assume ASCII.

They assume ASCII - unless you declare your charset (the exception being 
Outlook Express and a few Windows newsreaders). Everything else is 
"guessing".

> The original article displayed fine for me. Google Groups displays it
> correctly too:
> 
> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc

Your understanding of the principles of Unicode is as least as non-
existant as the OP's.
 
> I could just as easily argue that assuming ISO 8859-1 is the defacto
> standard, and that its your newsreader that's broken.

There is no "standard" in regard to guessing (this is what you call 
"assuming"). The need for explicit declaration of an encoding is exactly 
the same in Python as in any Usenet article.

> The reality however is that RFC 1036 is the only standard for Usenet
> messages, defacto or otherwise, and so there's nothing wrong with
> anyone's newsreader.

The reality is that all non-broken newsreaders use MIME headers to 
declare and interpret the charset being used. I suggest you read at 
least http://www.joelonsoftware.com/articles/Unicode.html to get an idea 
of Unicode and associated topics.

Thorsten


From odeits at gmail.com  Sat Feb 21 16:12:32 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 13:12:32 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com> 
	<mailman.409.1235206092.11746.python-list@python.org>
Message-ID: <9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>

On Feb 21, 12:47?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi?:
>
>
>
> > On Feb 15, 11:31?pm, odeits <ode... at gmail.com> wrote:
> >> It seems what you are actually testing for is if the intersection of
> >> the two sets is not empty where the first set is the characters in
> >> your word and the second set is the characters in your defined string.
>
> > To expand on what I was saying I thought i should provide a code
> > snippet:
>
> > WORD = 'g' * 100
> > WORD2 = 'g' * 50 + 'U'
> > VOWELS = 'aeiouAEIOU'
> > BIGWORD = 'g' * 10000 + 'U'
>
> > def set_test(vowels, word):
>
> > ? ? vowels = set( iter(vowels))
> > ? ? letters = set( iter(word) )
>
> > ? ? if letters & vowels:
> > ? ? ? ? return True
> > ? ? else:
> > ? ? ? ? return False
>
> > with python 2.5 I got 1.30 usec/pass against the BIGWORD
>
> You could make it slightly faster by removing the iter() call: letters = ?
> set(word)
> And (if vowels are really constant) you could pre-build the vowels set.
>
> --
> Gabriel Genellina

set(word) = set{[word]} meaning a set with one element, the string
the call to iter makes it set of the letters making up the word.


From alia_khouri at yahoo.com  Sat Feb 21 16:31:07 2009
From: alia_khouri at yahoo.com (Alia K)
Date: Sat, 21 Feb 2009 13:31:07 -0800 (PST)
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
	<gnpeda$4tp$1@panix3.panix.com>
Message-ID: <c6b9e335-a04d-44cb-b18e-18a52eef1586@k19g2000yqg.googlegroups.com>

Aahz wrote:
> Longer answer: the way in Python to achieve the full power of Ruby
> blocks is to write a function.

You are most likely right... there is probably no need to introduce
ruby-like blocks to python where iteration comes naturally with list
comprehensions and generators. But for the simple case of entering a
block of code as one does with @contextmanager I suppose it would be
nice to make a generator with a single yield statement a
contextmanager by default such that:

>>> def g():
...     print "a"
...     yield
...     print "b"
...
>>> with g():
...     print "c"
...
a
c
b

would be equivalent to

>>> from __future__ import with_statement
>>> from contextlib import contextmanager
>>> @contextmanager
... def g():
...     print "a"
...     yield
...     print "b"
...
>>> with g():
...     print "c"
...
a
c
b

but then again, I suppose "explicit is better than implicit"...

AK



From http  Sat Feb 21 17:02:27 2009
From: http (Paul Rubin)
Date: 21 Feb 2009 14:02:27 -0800
Subject: `high overhead of multiple Python processes' (was: Will
	multithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com>
	<28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com>
	<d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com>
	<04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com>
	<6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com>
	<mailman.241.1235048289.11746.python-list@python.org>
	<4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com>
	<d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com>
	<7x8wo2kwoz.fsf@ruckus.brouhaha.com>
	<975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3aeadqlo.fsf@ruckus.brouhaha.com>
	<87mycfczvd.fsf_-_@slice.rozzin.com>
Message-ID: <7xfxi75tzg.fsf@ruckus.brouhaha.com>

Joshua Judson Rosen <rozzin at geekspace.com> writes:
> > Right, that's basically the issue here: the cost of using multiple
> > Python processes is unnecessarily high.
> What cost is that? 

The cost of messing with the multiprocessing module instead of having
threads work properly, and the overhead of serializing Python data
structures to send to another process by IPC, instead of using the
same object in two threads.  Also, one way I often use threading is by
sending function objects to another thread through a Queue, so the
other thread can evaluate the function.  I don't think multiprocessing
gives a way to serialize functions, though maybe something like it
can be done at higher nuisance using classes.


From rridge at csclub.uwaterloo.ca  Sat Feb 21 17:07:35 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 17:07:35 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
Message-ID: <gnptv7$u4b$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
> Except in practice unlike Python, many newsreaders don't assume ASCII.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>They assume ASCII - unless you declare your charset (the exception being 
>Outlook Express and a few Windows newsreaders). Everything else is 
>"guessing".

No, it's an assumption like the way Python by default assumes ASCII.

>> The original article displayed fine for me. Google Groups displays it
>> correctly too:
>> 
>> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc
>
>Your understanding of the principles of Unicode is as least as non-
>existant as the OP's.
 
The link demonstrates that Google Groups doesn't assume ASCII like
Python does.  Since popular newsreaders like Google Groups and Outlook
Express can display the message correctly without the MIME headers,
but your obscure one can't, there's a much stronger case to made that
it's your newsreader that's broken.

>> I could just as easily argue that assuming ISO 8859-1 is the defacto
>> standard, and that its your newsreader that's broken.
>
>There is no "standard" in regard to guessing (this is what you call 
>"assuming"). The need for explicit declaration of an encoding is exactly 
>the same in Python as in any Usenet article.

No, many newsreaders don't assume ASCII by default like Python. 

>> The reality however is that RFC 1036 is the only standard for Usenet
>> messages, defacto or otherwise, and so there's nothing wrong with
>> anyone's newsreader.
>
>The reality is that all non-broken newsreaders use MIME headers to 
>declare and interpret the charset being used. 

Since RFC 1036 doesn't require MIME headers a reader that doesn't generate
them is by definition not broken.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From rdmurray at bitdance.com  Sat Feb 21 17:24:51 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 21 Feb 2009 22:24:51 +0000 (UTC)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com>
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com>
	<mailman.409.1235206092.11746.python-list@python.org>
	<9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>
Message-ID: <gnpuvi$974$1@ger.gmane.org>

odeits <odeits at gmail.com> wrote:
> On Feb 21, 12:47=A0am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
> > En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi=F3:
> >
> > > On Feb 15, 11:31=A0pm, odeits <ode... at gmail.com> wrote:
> > >> It seems what you are actually testing for is if the intersection of
> > >> the two sets is not empty where the first set is the characters in
> > >> your word and the second set is the characters in your defined string.
> >
> > > To expand on what I was saying I thought i should provide a code
> > > snippet:
> >
> > > WORD = 'g' * 100
> > > WORD2 = 'g' * 50 + 'U'
> > > VOWELS = 'aeiouAEIOU'
> > > BIGWORD = 'g' * 10000 + 'U'
> >
> > > def set_test(vowels, word):
> >
> > >  vowels = set( iter(vowels))
> > >  letters = set( iter(word) )
> >
> > >  if letters & vowels:
> > >      return True
> > >  else:
> > >     return False
> >
> > > with python 2.5 I got 1.30 usec/pass against the BIGWORD
> >
> > You could make it slightly faster by removing the iter() call:
> > letters = set(word)
> > And (if vowels are really constant) you could pre-build the vowels set.
> 
> set(word) = set{[word]} meaning a set with one element, the string
> the call to iter makes it set of the letters making up the word.

Did you try it?

Python 2.6.1 (r261:67515, Jan  7 2009, 17:09:13) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> set('abcd')
set(['a', 'c', 'b', 'd'])

--RDM



From pavlovevidence at gmail.com  Sat Feb 21 17:24:55 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 21 Feb 2009 14:24:55 -0800 (PST)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
Message-ID: <de63f874-8d5f-403f-9538-a15e4a8114e3@f3g2000yqf.googlegroups.com>

On Feb 19, 6:57?pm, Ron Garret <rNOSPA... at flownet.com> wrote:
> I'm writing a little wiki that I call ?Wiki. ?That's a lowercase Greek
> mu at the beginning (it's pronounced micro-wiki). ?It's working, except
> that I can't actually enter the name of the wiki into the wiki itself
> because the default unicode encoding on my Python installation is
> "ascii". ?So I'm trying to decide on a course of action. ?There seem to
> be three possibilities:
>
> 1. ?Change the code to properly support unicode. ?Preliminary
> investigations indicate that this is going to be a colossal pain in the
> ass.
>
> 2. ?Change the default encoding on my Python installation to be latin-1
> or UTF8. ?The disadvantage to this is that no one else will be able to
> run my code without making the same change to their installation, since
> you can't change default encodings once Python has started.
>
> 3. ?Punt and spell it 'uwiki' instead.
>
> I'm feeling indecisive so I thought I'd ask other people's opinion. ?
> What should I do?
>
> rg



From ethan at stoneleaf.us  Sat Feb 21 17:44:42 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 21 Feb 2009 14:44:42 -0800
Subject: datetime.time and midnight
Message-ID: <49A083DA.7000107@stoneleaf.us>

Greetings, List!

I was curious if anyone knew the rationale behind making midnight False?

--> import datetime
--> midnight = datetime.time(0,0,0)
--> bool(midnight)
False

To my way of thinking, midnight does actually exist so it should be 
true.  If datetime.time was measuring an *amount* of time, rather than a 
certain point during the day, then a time of 0:0:0 should certainly be 
False as it would mean no time had passed.  However, since midnight does 
indeed exist (as many programmers have observed when deadlines approach 
;) I would think it should be true.
--
~Ethan~


From thorsten at thorstenkampe.de  Sat Feb 21 17:52:03 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sat, 21 Feb 2009 23:52:03 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240aa3fa43f4cb299897c9@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 17:07:35 -0500)
> The link demonstrates that Google Groups doesn't assume ASCII like
> Python does.  Since popular newsreaders like Google Groups and Outlook
> Express can display the message correctly without the MIME headers,
> but your obscure one can't, there's a much stronger case to made that
> it's your newsreader that's broken.

*sigh* I give up on you. You didn't even read the "Joel on Software" 
article. The whole "why" and "what for" of Unicode and MIME will always 
be a complete mystery to you.

T.


From rridge at csclub.uwaterloo.ca  Sat Feb 21 18:06:35 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 18:06:35 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
Message-ID: <gnq1dr$v2n$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 17:07:35 -0500) 
> The link demonstrates that Google Groups doesn't assume ASCII like
> Python does.  Since popular newsreaders like Google Groups and Outlook
> Express can display the message correctly without the MIME headers,
> but your obscure one can't, there's a much stronger case to made that
> it's your newsreader that's broken.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>*sigh* I give up on you. You didn't even read the "Joel on Software" 
>article. The whole "why" and "what for" of Unicode and MIME will always 
>be a complete mystery to you.

I understand what Unicode and MIME are for and why they exist.  Neither
their merits nor your insults change the fact that the only current
standard governing the content of Usenet posts doesn't require their use.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From aahz at pythoncraft.com  Sat Feb 21 18:29:32 2009
From: aahz at pythoncraft.com (Aahz)
Date: 21 Feb 2009 15:29:32 -0800
Subject: zlib interface semi-broken
References: <20090210205739.GT6522@subspacefield.org>
	<mailman.9414.1234459585.3487.python-list@python.org>
Message-ID: <gnq2os$di6$1@panix3.panix.com>

In article <mailman.9414.1234459585.3487.python-list at python.org>,
Travis  <travis+ml-python at subspacefield.org> wrote:
>
>So I've submitted a patch to bugs.python.org to add a new member
>called is_finished to the zlib decompression object.
>
>Issue 5210, file 13056, msg 81780

You may also want to bring this up on the python-ideas mailing list for
further discussion.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From thorsten at thorstenkampe.de  Sat Feb 21 18:35:35 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sun, 22 Feb 2009 00:35:35 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240aae2e3eecab709897ca@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
> > The link demonstrates that Google Groups doesn't assume ASCII like
> > Python does.  Since popular newsreaders like Google Groups and Outlook
> > Express can display the message correctly without the MIME headers,
> > but your obscure one can't, there's a much stronger case to made that
> > it's your newsreader that's broken.
> 
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >*sigh* I give up on you. You didn't even read the "Joel on Software" 
> >article. The whole "why" and "what for" of Unicode and MIME will always 
> >be a complete mystery to you.
> 
> I understand what Unicode and MIME are for and why they exist. Neither
> their merits nor your insults change the fact that the only current
> standard governing the content of Usenet posts doesn't require their
> use.

That's right. As long as you use pure ASCII you can skip this nasty step 
of informing other people which charset you are using. If you do use non 
ASCII then you have to do that. That's the way virtually all newsreaders 
work. It has nothing to do with some 21+ year old RFC. Even your Google 
Groups "newsreader" does that ('content="text/html; charset=UTF-8"').

Being explicit about your encoding is 99% of the whole Unicode magic in 
Python and in any communication across the Internet (may it be NNTP, 
SMTP or HTTP). Your Google Groups simply uses heuristics to guess the 
encoding the OP probably used. Windows newsreaders simply use the locale 
of the local host. That's guessing. You can call it assuming but it's 
still guessing. There is no way you can be sure without any declaration.

And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded 
text doesn't fit that encoding it refuses to guess.

T.


From google at mrabarnett.plus.com  Sat Feb 21 18:55:23 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 21 Feb 2009 23:55:23 +0000
Subject: datetime.time and midnight
In-Reply-To: <49A083DA.7000107@stoneleaf.us>
References: <49A083DA.7000107@stoneleaf.us>
Message-ID: <49A0946B.8040206@mrabarnett.plus.com>

Ethan Furman wrote:
> Greetings, List!
> 
> I was curious if anyone knew the rationale behind making midnight False?
> 
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
> 
> To my way of thinking, midnight does actually exist so it should be 
> true.  If datetime.time was measuring an *amount* of time, rather than a 
> certain point during the day, then a time of 0:0:0 should certainly be 
> False as it would mean no time had passed.  However, since midnight does 
> indeed exist (as many programmers have observed when deadlines approach 
> ;) I would think it should be true.
> 
I think it's because midnight is to the time of day what zero is to
integers, or an empty string is to strings, or an empty container ...


From Graham.Dumpleton at gmail.com  Sat Feb 21 18:58:45 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 21 Feb 2009 15:58:45 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com>
Message-ID: <83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com>

On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Jesse Noller <jnol... at gmail.com> writes:
>
> > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > <Graham.Dumple... at gmail.com> wrote:
> > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > _bootstrap() doing:
>
> > > ?os.close(sys.stdin.fileno())
>
> > > rather than:
>
> > > ?sys.stdin.close()
>
> > > Technically it is feasible that stdin could have been replaced with
> > > something other than a file object, where the replacement doesn't have
> > > a fileno() method.
>
> > > In that sort of situation an AttributeError would be raised, which
> > > isn't going to be caught as either OSError or ValueError, which is all
> > > the code watches out for.
>
> > I don't know why it was implemented that way. File an issue on the
> > tracker and assign it to me (jnoller) please.
>
> My guess would be: because it's also possible for sys.stdin to be a
> file that's open in read+*write* mode, and for that file to have
> pending output buffered (for example, in the case of a socketfile).

If you are going to have a file that is writable as well as readable,
such as a socket, then likely that sys.stdout/sys.stderr are going to
be bound to it at the same time. If that is the case then one should
not be using close() at all as it will then also close the write side
of the pipe and cause errors when code subsequently attempts to write
to sys.stdout/sys.stderr.

In the case of socket you would actually want to use shutdown() to
close just the input side of the socket.

What this all means is that what is the appropriate thing to do is
going to depend on the environment in which the code is used. Thus,
having the behaviour hard wired a certain way is really bad. There
perhaps instead should be a way of a user providing a hook function to
be called to perform any case specific cleanup of stdin, stdout and
stderr, or otherwise reassign them.

That this is currently in the _bootstrap() function, which does other
important stuff, doesn't exactly make it look like it is easily
overridden to work for a specific execution environment which is
different to the norm.

> There's a general guideline, inherited from C, that one should ensure
> that the higher-level close() routine is invoked on a given
> file-descriptor in at most *one* process after that descriptor has
> passed through a fork(); in the other (probably child) processes, the
> lower-level close() routine should be called to avoid a
> double-flush--whereby buffered data is flushed out of one process, and
> then the *same* buffered data is flushed out of the (other)
> child-/parent-process' copy of the file-object.
>
> So, if you call sys.stdin.close() in the child-process in
> _bootstrap(), then it could lead to a double-flush corrupting output
> somewhere in the application that uses the multiprocessing module.
>
> You can expect similar issues with just about /any/ `file-like objects'
> that might have `file-like semantics' of buffering data and flushing
> it on close, also--because you end up with multiple copies of the same
> object in `pre-flush' state, and each copy tries to flush at some point.
>
> As such, I'd recommend against just using .close(); you might use
> something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> `else' clause unconditionally calls sys.stdin.close(), then you still
> have double-flush problems if someone's set sys.stdin to a file-like
> object with output-buffering.
>
> I guess you could try calling that an `edge-case' and seeing if anyone
> screams. It'd be sort-of nice if there was finer granularity in the
> file API--maybe if file.close() took a boolean `flush' argument....

Graham


From rridge at csclub.uwaterloo.ca  Sat Feb 21 19:39:42 2009
From: rridge at csclub.uwaterloo.ca (Ross Ridge)
Date: Sat, 21 Feb 2009 19:39:42 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
Message-ID: <gnq6se$n4$1@rumours.uwaterloo.ca>

Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
> I understand what Unicode and MIME are for and why they exist. Neither
> their merits nor your insults change the fact that the only current
> standard governing the content of Usenet posts doesn't require their
> use.

Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>That's right. As long as you use pure ASCII you can skip this nasty step 
>of informing other people which charset you are using. If you do use non 
>ASCII then you have to do that. That's the way virtually all newsreaders 
>work. It has nothing to do with some 21+ year old RFC. Even your Google 
>Groups "newsreader" does that ('content="text/html; charset=UTF-8"').

No, the original post demonstrates you don't have include MIME headers for
ISO 8859-1 text to be properly displayed by many newsreaders.  The fact
that your obscure newsreader didn't display it properly doesn't mean
that original poster's newsreader is broken.

>Being explicit about your encoding is 99% of the whole Unicode magic in 
>Python and in any communication across the Internet (may it be NNTP, 
>SMTP or HTTP).

HTTP requires the assumption of ISO 8859-1 in the absense of any
specified encoding. 

>Your Google Groups simply uses heuristics to guess the 
>encoding the OP probably used. Windows newsreaders simply use the locale 
>of the local host. That's guessing. You can call it assuming but it's 
>still guessing. There is no way you can be sure without any declaration.

Newsreaders assuming ISO 8859-1 instead of ASCII doesn't make it a guess.
It's just a different assumption, nor does making an assumption, ASCII
or ISO 8850-1, give you any certainty.

>And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded 
>text doesn't fit that encoding it refuses to guess.

Which is reasonable given that Python is programming language where it's
better to have more conservative assumption about encodings so errors
can be more quickly diagnosed.  A newsreader however is a different
beast, where it's better to make a less conservative assumption that's
more likely to display messages correctly to the user.  Assuming ISO
8859-1 in the absense of any specified encoding allows the message to be
correctly displayed if the character set is either ISO 8859-1 or ASCII.
Doing things the "pythonic" way and assuming ASCII only allows such
messages to be displayed if ASCII is used.

					Ross Ridge

-- 
 l/  //	  Ross Ridge -- The Great HTMU
[oo][oo]  rridge at csclub.uwaterloo.ca
-()-/()/  http://www.csclub.uwaterloo.ca/~rridge/ 
 db  //	  


From odeits at gmail.com  Sat Feb 21 19:53:25 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 16:53:25 -0800 (PST)
Subject: Pythonic way to determine if one char of many in a string
References: <1234761457.20683.1300568627@webmail.messagingengine.com> 
	<mailman.18.1234763765.11746.python-list@python.org>
	<8666ef66-288d-426a-9622-9d68d1f7971c@b40g2000pri.googlegroups.com>
	<9f03fc9d-7136-4372-8116-a999fb67bf87@p23g2000prp.googlegroups.com> 
	<mailman.409.1235206092.11746.python-list@python.org>
	<9e7c7dc9-deb4-4cdb-99a3-411d89ce73b6@e18g2000yqo.googlegroups.com>
	<mailman.426.1235255122.11746.python-list@python.org>
Message-ID: <2811f9f5-ca08-47f3-b70d-4106443d3b36@a12g2000yqm.googlegroups.com>

On Feb 21, 2:24?pm, rdmur... at bitdance.com wrote:
> odeits <ode... at gmail.com> wrote:
> > On Feb 21, 12:47=A0am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> > > En Sat, 21 Feb 2009 01:14:02 -0200, odeits <ode... at gmail.com> escribi=F3:
>
> > > > On Feb 15, 11:31=A0pm, odeits <ode... at gmail.com> wrote:
> > > >> It seems what you are actually testing for is if the intersection of
> > > >> the two sets is not empty where the first set is the characters in
> > > >> your word and the second set is the characters in your defined string.
>
> > > > To expand on what I was saying I thought i should provide a code
> > > > snippet:
>
> > > > WORD = 'g' * 100
> > > > WORD2 = 'g' * 50 + 'U'
> > > > VOWELS = 'aeiouAEIOU'
> > > > BIGWORD = 'g' * 10000 + 'U'
>
> > > > def set_test(vowels, word):
>
> > > > ?vowels = set( iter(vowels))
> > > > ?letters = set( iter(word) )
>
> > > > ?if letters & vowels:
> > > > ? ? ?return True
> > > > ?else:
> > > > ? ? return False
>
> > > > with python 2.5 I got 1.30 usec/pass against the BIGWORD
>
> > > You could make it slightly faster by removing the iter() call:
> > > letters = set(word)
> > > And (if vowels are really constant) you could pre-build the vowels set.
>
> > set(word) = set{[word]} meaning a set with one element, the string
> > the call to iter makes it set of the letters making up the word.
>
> Did you try it?
>
> Python 2.6.1 (r261:67515, Jan ?7 2009, 17:09:13)
> [GCC 4.3.2] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> set('abcd')
>
> set(['a', 'c', 'b', 'd'])
>
> --RDM

You are in fact correct. Thank you for pointing that out.


From thorsten at thorstenkampe.de  Sat Feb 21 20:25:54 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Sun, 22 Feb 2009 02:25:54 +0100
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
Message-ID: <MPG.240ac80c16120c7b9897cb@news.individual.de>

* Ross Ridge (Sat, 21 Feb 2009 19:39:42 -0500)
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
> >That's right. As long as you use pure ASCII you can skip this nasty step 
> >of informing other people which charset you are using. If you do use non 
> >ASCII then you have to do that. That's the way virtually all newsreaders 
> >work. It has nothing to do with some 21+ year old RFC. Even your Google 
> >Groups "newsreader" does that ('content="text/html; charset=UTF-8"').
> 
> No, the original post demonstrates you don't have include MIME headers for
> ISO 8859-1 text to be properly displayed by many newsreaders.

*sigh* As you still refuse to read the article[1] I'm going to quote it 
now here:

'The Single Most Important Fact About Encodings

If you completely forget everything I just explained, please remember 
one extremely important fact. It does not make sense to have a string 
without knowing what encoding it uses.
[...]
If you have a string [...] in an email message, you have to know what 
encoding it is in or you cannot interpret it or display it to users 
correctly.

Almost every [...] "she can't read my emails when I use accents" problem 
comes down to one naive programmer who didn't understand the simple fact 
that if you don't tell me whether a particular string is encoded using 
UTF-8 or ASCII or ISO 8859-1 (Latin 1) or Windows 1252 (Western 
European), you simply cannot display it correctly [...]. There are over 
a hundred encodings and above code point 127, all bets are off.'

Enough said.

> The fact that your obscure newsreader didn't display it properly
> doesn't mean that original poster's newsreader is broken.

You don't even know if my "obscure newsreader" displayed it properly. 
Non ASCII text without a declared encoding is just a bunch of bytes. 
It's not even text.

T.

[1] http://www.joelonsoftware.com/articles/Unicode.html


From db3l.net at gmail.com  Sat Feb 21 20:37:09 2009
From: db3l.net at gmail.com (David Bolen)
Date: Sat, 21 Feb 2009 20:37:09 -0500
Subject: Using clock() in threading on Windows
References: <mailman.389.1235175307.11746.python-list@python.org>
	<499fc63c$0$30913$9b622d9e@news.freenet.de>
Message-ID: <m263j3gsl6.fsf@valheru.db3l.homeip.net>

"Martin v. L?wis" <martin at v.loewis.de> writes:

> As a consequence, the half-busy loops could go away, at least
> on systems where lock timeouts can be given to the system.

I know that in some cases in the past I've had to bypass a Queue's use
of threading objects for waiting for a queue to unblock because of the
increased overhead (and latency as the timer increases) of the busy
loop.  On windows, replacing it with an implementation using
WaitForObject calls with the same timeouts I would have used with the
Queue performed much better, not unexpectedly, but was non-portable.

The current interface to the lowest level locks in Python are
certainly generic enough to cross lots of platforms, but it would
definitely be useful if they could implement timeouts without busy
loops on those platforms where they were supported.

-- David


From rozzin at geekspace.com  Sat Feb 21 20:52:19 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sat, 21 Feb 2009 20:52:19 -0500
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com>
	<83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com>
Message-ID: <87tz6ns0fg.fsf@slice.rozzin.com>

Graham Dumpleton <Graham.Dumpleton at gmail.com> writes:
>
> On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> > Jesse Noller <jnol... at gmail.com> writes:
> >
> > > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > > <Graham.Dumple... at gmail.com> wrote:
> > > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > > _bootstrap() doing:
> >
> > > > ?os.close(sys.stdin.fileno())
> >
> > > > rather than:
> >
> > > > ?sys.stdin.close()
> >
> > > > Technically it is feasible that stdin could have been replaced with
> > > > something other than a file object, where the replacement doesn't have
> > > > a fileno() method.
> >
> > > > In that sort of situation an AttributeError would be raised, which
> > > > isn't going to be caught as either OSError or ValueError, which is all
> > > > the code watches out for.
> >
> > > I don't know why it was implemented that way. File an issue on the
> > > tracker and assign it to me (jnoller) please.
> >
> > My guess would be: because it's also possible for sys.stdin to be a
> > file that's open in read+*write* mode, and for that file to have
> > pending output buffered (for example, in the case of a socketfile).
> 
> If you are going to have a file that is writable as well as readable,
> such as a socket, then likely that sys.stdout/sys.stderr are going to
> be bound to it at the same time.

Yes.

> If that is the case then one should not be using close() at all

If you mean stdin.close(), then that's what I said :)

> as it will then also close the write side of the pipe and cause
> errors when code subsequently attempts to write to
> sys.stdout/sys.stderr.
>
> 
> In the case of socket you would actually want to use shutdown() to
> close just the input side of the socket.

Sure--but isn't this "you" the /calling/ code that set the whole thing
up? What the /caller/ does with its stdio is up to /him/, and beyond
the scope of the present discourse. I can appreciate a library forking
and then using os.close() on stdio (it protects my files from any I/O
the subprocess might think it wants to do with them), but I think I
might be even more annoyed if it *shutdown my sockets* than if it
caused double-flushes (there's at least a possibility that I could
cope with the double-flushes by just ensuring that *I* flushed before
the fork--not so with socket.shutdown()!)

> What this all means is that what is the appropriate thing to do is
> going to depend on the environment in which the code is used. Thus,
> having the behaviour hard wired a certain way is really bad. There
> perhaps instead should be a way of a user providing a hook function to
> be called to perform any case specific cleanup of stdin, stdout and
> stderr, or otherwise reassign them.

Usually, I'd say that that's what the methods on the passed-in object
are for. Though, as I said--the file-object API is lacking, here :(

> > As such, I'd recommend against just using .close(); you might use
> > something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> > `else' clause unconditionally calls sys.stdin.close(), then you still
> > have double-flush problems if someone's set sys.stdin to a file-like
> > object with output-buffering.
> >
> > I guess you could try calling that an `edge-case' and seeing if anyone
> > screams. It'd be sort-of nice if there was finer granularity in the
> > file API--maybe if file.close() took a boolean `flush' argument....

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From seandc at att.net  Sat Feb 21 21:03:41 2009
From: seandc at att.net (Sean)
Date: Sun, 22 Feb 2009 02:03:41 GMT
Subject: Python dictionary size/entry limit?
In-Reply-To: <499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <1o2ol.392511$Mh5.120409@bgtnsc04-news.ops.worldnet.att.net>

Stefan Behnel wrote:
> intelliminer at gmail.com wrote:
> You may be better served with one of the dbm databases that come with
> Python. They live on-disk but do the usual in-memory caching. They'll
> likely perform a lot better than your OS level swap file.
> 
> Stefan

the bsddb module has the feature that access to the database uses the 
same methods as python dictionaries.

Sean


From odeits at gmail.com  Sat Feb 21 21:34:47 2009
From: odeits at gmail.com (odeits)
Date: Sat, 21 Feb 2009 18:34:47 -0800 (PST)
Subject: count secton of data in list
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
	<mailman.386.1235173577.11746.python-list@python.org>
Message-ID: <3ed253bb-d6ec-4f47-af08-ad193e9c46e3@h16g2000yqj.googlegroups.com>

On Feb 20, 3:45?pm, Emile van Sebille <em... at fenx.com> wrote:
> brianrpsgt1 wrote:
>
> > def step1(val):
>
> ? ? ? ?data2_row = []
>
> > ? ? for d1r in data1_row:
> > ? ? ? ? if d1r[1] >= val:
> > ? ? ? ? ? ? switch = 0
> > ? ? ? ? ? ? data2_row = d1r[0],d1r[1],d1r[2],switch
>
> ? ? ? ? ? ? ? ?data2_row.append([d1r[0],d1r[1],d1r[2],switch])
>
> HTH,
>
> Emile

def count_consecutive(rows):
    switch = 0
    count = 0
    for r in rows:
        if r[-1] == switch:
            count += 1
        else:
            switch = not switch
            if count != 0:
                yield count
                count = 0
    if count != 0:
        yield count



rows = [
['2009-01-09','13:17:30,96',123456,0],
['2009-01-09','13:17:31,95',123456,0],
['2009-01-09','13:17:32,95',123456,0],
['2009-01-09','13:17:33,95',123456,0],
['2009-01-09','13:17:34,94',123456,1],
['2009-01-09','13:17:35,94',123456,1],
['2009-01-09','13:17:36,94',123456,1],
['2009-01-09','13:17:37,94',123456,1],
['2009-01-09','13:17:38,94',123456,1],
['2009-01-09','13:17:39,94',123456,1],
['2009-01-09','13:17:40,94',123456,1],
['2009-01-09','13:17:41,94',123456,1],
['2009-01-09','13:17:42,95',123456,0],
['2009-01-09','13:17:43,95',123456,0],
['2009-01-09','13:17:44,95',123456,0],
['2009-01-09','13:17:45,95',123456,0]
]

for cnt in count_consecutive(rows):
    print cnt


From steve at holdenweb.com  Sat Feb 21 21:46:27 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 21:46:27 -0500
Subject: Wanted: Online Python Course for Credit
In-Reply-To: <HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>
References: <3d974c13-efcd-48ae-8015-7b4a8812280f@w1g2000prk.googlegroups.com>
	<HM-dndhe-_zXqT3UnZ2dnUVZ_hCWnZ2d@pdx.net>
Message-ID: <gnqea4$b5l$1@ger.gmane.org>

Scott David Daniels wrote:
> jsidell wrote:
>> I'm a high school game development teacher and I have recently
>> discovered Python to be a great way to introduce computer
>> programming.  I intend to study Python on my own but I can get
>> professional development credit at my job for taking a Python course.
>> So I'm looking for an online class that I can get a certificate,
>> college credit, or something to that effect.  Any suggestions would be
>> greatly appreciated
> 
O'Reilly have commissioned me to write four on-line classes. We
anticipate that they will become available later this year through the
O'Reilly School of Technology - see http://www.oreillyschool.com/

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sat Feb 21 22:04:02 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 21 Feb 2009 22:04:02 -0500
Subject: To unicode or not to unicode
In-Reply-To: <MPG.240a8b0f8b7d32969897c8@news.individual.de>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>	<499F0CF0.8070800@v.loewis.de>
	<gnpd8s$pm9$1@rumours.uwaterloo.ca>	<MPG.240a64495647d8329897c6@news.individual.de>	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
Message-ID: <gnqfb3$cf6$1@ger.gmane.org>

Thorsten Kampe wrote:
> * Ross Ridge (Sat, 21 Feb 2009 14:52:09 -0500)
>> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>> It's all about declaring your charset. In Python as well as in your
>>> newsreader. If you don't declare your charset it's ASCII for you - in
>>> Python as well as in your newsreader.
>> Except in practice unlike Python, many newsreaders don't assume ASCII.
> 
> They assume ASCII - unless you declare your charset (the exception being 
> Outlook Express and a few Windows newsreaders). Everything else is 
> "guessing".
> 
>> The original article displayed fine for me. Google Groups displays it
>> correctly too:
>>
>> 	http://groups.google.com/group/comp.lang.python/msg/828fefd7040238bc
> 
> Your understanding of the principles of Unicode is as least as non-
> existant as the OP's.
>  
>> I could just as easily argue that assuming ISO 8859-1 is the defacto
>> standard, and that its your newsreader that's broken.
> 
> There is no "standard" in regard to guessing (this is what you call 
> "assuming"). The need for explicit declaration of an encoding is exactly 
> the same in Python as in any Usenet article.
> 
>> The reality however is that RFC 1036 is the only standard for Usenet
>> messages, defacto or otherwise, and so there's nothing wrong with
>> anyone's newsreader.
> 
> The reality is that all non-broken newsreaders use MIME headers to 
> declare and interpret the charset being used. I suggest you read at 
> least http://www.joelonsoftware.com/articles/Unicode.html to get an idea 
> of Unicode and associated topics.
> 
And I suggest you try to phrase your remarks in a way more respectful of
those you are discussing these matters with. I understand that
exasperation can lead to offensiveness, but if a lack of understanding
does exist then it's better to simply try and remove it without
commenting on its existence.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From martin at v.loewis.de  Sat Feb 21 23:21:21 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 05:21:21 +0100
Subject: To unicode or not to unicode
In-Reply-To: <eMqdncylcMt7Az3UnZ2dnUVZ_qaWnZ2d@earthlink.com>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
	<MPG.240a8b0f8b7d32969897c8@news.individual.de>
	<gnptv7$u4b$1@rumours.uwaterloo.ca>
	<eMqdncylcMt7Az3UnZ2dnUVZ_qaWnZ2d@earthlink.com>
Message-ID: <49A0D2C1.5080102@v.loewis.de>

> 	Since when is "Google Groups" a newsreader? So far as I know, all
> the display/formatting is handled by my web browser and GG merely stuffs
> messages into an HTML wrapper...

It also transmits this HTML wrapper via HTTP, where it claims that the
charset of the HTML is UTF-8. To do that, it must have converted the
original message from Latin-1 to UTF-8, which must have required
interpreting it as Latin-1 in the first place.

Regards,
Martin


From peter.anderson at internode.on.net  Sat Feb 21 23:46:07 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Sun, 22 Feb 2009 15:46:07 +1100
Subject: Python 3 and easygui problem
Message-ID: <49A0D88F.4010806@internode.on.net>

I have just installed Python 3. I have been using Tkinter and easygui 
(with Python 2.5.4) for any GUI needs. I have just started to port some 
of my existing scripts to Python 3 and discovered problems with easygui.

I was using the following script for testing:

from easygui import *
import sys

while 1:
msgbox("Hello, world!")

msg ="What is your favorite flavor?"
title = "Ice Cream Survey"
choices = ["Vanilla", "Chocolate", "Strawberry", "Rocky Road"]
choice = choicebox(msg, title, choices)

# note that we convert choice to string, in case
# the user cancelled the choice, and we got None.
msgbox("You chose: " + str(choice), "Survey Result")

msg = "Do you want to continue?"
title = "Please Confirm"
if ccbox(msg, title): # show a Continue/Cancel dialog
pass # user chose Continue
else:
sys.exit(0) # user chose Cancel

I have changed the easygui source to Python 3 'import' and 'print' 
requirements and the initial message box in the above script displays 
fine fine. However the subsequent message boxes do not display and after 
the script completes I get the following error message:

---------- Python 3 ----------
Traceback (most recent call last):
File "easyguidemo.py", line 10, in
choice = choicebox(msg, title, choices)
File "C:\Python30\lib\site-packages\easygui.py", line 703, in choicebox
return __choicebox(msg,title,choices,buttons)
File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
TypeError: must use keyword argument for key function

Output completed (7 sec consumed)
------------------------------

Fixing this is a bit beyond my skills and I was wondering whether anyone 
has any thoughts.

I am happy to post a copy of my revised easygui.py script.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From clp2 at rebertia.com  Sun Feb 22 00:05:51 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 21 Feb 2009 21:05:51 -0800
Subject: Python 3 and easygui problem
In-Reply-To: <49A0D88F.4010806@internode.on.net>
References: <49A0D88F.4010806@internode.on.net>
Message-ID: <50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>

On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
<peter.anderson at internode.on.net> wrote:
> I have just installed Python 3. I have been using Tkinter and easygui (with
> Python 2.5.4) for any GUI needs. I have just started to port some of my
> existing scripts to Python 3 and discovered problems with easygui.
>
> I was using the following script for testing:
<snip>

> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
> TypeError: must use keyword argument for key function

Change the line to

choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))

Note the "key=". The calling sequence for .sort() changed in Python
3.0 to make 'key' a keyword-only argument (I think).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From rozzin at geekspace.com  Sun Feb 22 00:07:34 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 00:07:34 -0500
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<499F0CF0.8070800@v.loewis.de> <gnpd8s$pm9$1@rumours.uwaterloo.ca>
	<MPG.240a64495647d8329897c6@news.individual.de>
	<gnpm19$rvm$1@rumours.uwaterloo.ca>
Message-ID: <87mycfqctl.fsf@slice.rozzin.com>

Ross Ridge <rridge at csclub.uwaterloo.ca> writes:
>
> > It's all about declaring your charset. In Python as well as in your 
> > newsreader. If you don't declare your charset it's ASCII for you - in 
> > Python as well as in your newsreader.
> 
> Except in practice unlike Python, many newsreaders don't assume ASCII.
> The original article displayed fine for me.

Right. Exactly.

Wasn't that exact issue a driving force behind unicode's creation in
the first place? :)

To avoid horrors like this:

   http://en.wikipedia.org/wiki/File:Letter_to_Russia_with_krokozyabry.jpg

... and people getting into arguments on usenet and having to use
rebuttals like "Well, it looked fine to *me*--there's nothing wrong,
we're just using incompatible encodings!"?

But you're right--specifying in usenet-posts is like
turn-signals....

Can we get back to Python programming, now? :)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From Graham.Dumpleton at gmail.com  Sun Feb 22 00:41:00 2009
From: Graham.Dumpleton at gmail.com (Graham Dumpleton)
Date: Sat, 21 Feb 2009 21:41:00 -0800 (PST)
Subject: multiprocessing module and os.close(sys.stdin.fileno())
References: <3098ffc2-6884-4a35-99a5-ee917442af25@r37g2000prr.googlegroups.com>
	<mailman.221.1235009774.11746.python-list@python.org>
	<87bpswe57v.fsf@slice.rozzin.com> 
	<83c3925e-6456-4d84-8490-7e1ef66b3c4b@41g2000yqf.googlegroups.com> 
	<87tz6ns0fg.fsf@slice.rozzin.com>
Message-ID: <8477ae7b-0b0a-45c5-aba0-8df85b916fc0@l39g2000yqn.googlegroups.com>

On Feb 22, 12:52?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Graham Dumpleton <Graham.Dumple... at gmail.com> writes:
>
> > On Feb 21, 4:20?pm, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> > > Jesse Noller <jnol... at gmail.com> writes:
>
> > > > On Tue, Feb 17, 2009 at 10:34 PM, Graham Dumpleton
> > > > <Graham.Dumple... at gmail.com> wrote:
> > > > > Why is the multiprocessing module, ie., multiprocessing/process.py, in
> > > > > _bootstrap() doing:
>
> > > > > ?os.close(sys.stdin.fileno())
>
> > > > > rather than:
>
> > > > > ?sys.stdin.close()
>
> > > > > Technically it is feasible that stdin could have been replaced with
> > > > > something other than a file object, where the replacement doesn't have
> > > > > a fileno() method.
>
> > > > > In that sort of situation an AttributeError would be raised, which
> > > > > isn't going to be caught as either OSError or ValueError, which is all
> > > > > the code watches out for.
>
> > > > I don't know why it was implemented that way. File an issue on the
> > > > tracker and assign it to me (jnoller) please.
>
> > > My guess would be: because it's also possible for sys.stdin to be a
> > > file that's open in read+*write* mode, and for that file to have
> > > pending output buffered (for example, in the case of a socketfile).
>
> > If you are going to have a file that is writable as well as readable,
> > such as a socket, then likely that sys.stdout/sys.stderr are going to
> > be bound to it at the same time.
>
> Yes.
>
> > If that is the case then one should not be using close() at all
>
> If you mean stdin.close(), then that's what I said :)

Either. The problem is that same, it close for both read and write and
if was expecting to still be able to write because used for stdout or
stderr, then will not work.

> > as it will then also close the write side of the pipe and cause
> > errors when code subsequently attempts to write to
> > sys.stdout/sys.stderr.
>
> > In the case of socket you would actually want to use shutdown() to
> > close just the input side of the socket.
>
> Sure--but isn't this "you" the /calling/ code that set the whole thing
> up? What the /caller/ does with its stdio is up to /him/, and beyond
> the scope of the present discourse. I can appreciate a library forking
> and then using os.close() on stdio (it protects my files from any I/O
> the subprocess might think it wants to do with them), but I think I
> might be even more annoyed if it *shutdown my sockets*

Ah, yeah, forgot that shutdown does end to end shutdown rather than
just that file object reference. :-)

Graham

> than if it
> caused double-flushes (there's at least a possibility that I could
> cope with the double-flushes by just ensuring that *I* flushed before
> the fork--not so with socket.shutdown()!)
>
> > What this all means is that what is the appropriate thing to do is
> > going to depend on the environment in which the code is used. Thus,
> > having the behaviour hard wired a certain way is really bad. There
> > perhaps instead should be a way of a user providing a hook function to
> > be called to perform any case specific cleanup of stdin, stdout and
> > stderr, or otherwise reassign them.
>
> Usually, I'd say that that's what the methods on the passed-in object
> are for. Though, as I said--the file-object API is lacking, here :(
>
> > > As such, I'd recommend against just using .close(); you might use
> > > something like `if hasattr(sys.stdin, "fileno"): ...'; but, if your
> > > `else' clause unconditionally calls sys.stdin.close(), then you still
> > > have double-flush problems if someone's set sys.stdin to a file-like
> > > object with output-buffering.
>
> > > I guess you could try calling that an `edge-case' and seeing if anyone
> > > screams. It'd be sort-of nice if there was finer granularity in the
> > > file API--maybe if file.close() took a boolean `flush' argument....
>
> --
> Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).



From paddy3118 at googlemail.com  Sun Feb 22 00:51:10 2009
From: paddy3118 at googlemail.com (Paddy3118)
Date: Sat, 21 Feb 2009 21:51:10 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
Message-ID: <5a2e2b9c-12d6-4606-9dff-0d7f4f9642c1@q9g2000yqc.googlegroups.com>

On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:
> Greetings, List!
>
> I was curious if anyone knew the rationale behind making midnight False?
>
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
>
> To my way of thinking, midnight does actually exist so it should be
> true. ?If datetime.time was measuring an *amount* of time, rather than a
> certain point during the day, then a time of 0:0:0 should certainly be
> False as it would mean no time had passed. ?However, since midnight does
> indeed exist (as many programmers have observed when deadlines approach
> ;) I would think it should be true.
> --
> ~Ethan~

Ethan,
Knights are true and seek the light. Evil trolls seek the night and so
their hour is false.

;-)

- Paddy.


From sbassi at clubdelarazon.org  Sun Feb 22 01:06:15 2009
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Sun, 22 Feb 2009 04:06:15 -0200
Subject: Problem trying to install ReportLab with easy_install
Message-ID: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>

I don't understand what is wrong when I try to install ReportLab. This
is under Ubuntu and all build packages are installed.
Here is what I get when trying to install it: (I could install it with
apt-get, but I am testing virtualenv and easy_install).

(testbio149)vicky at maricurie:~/Public/testbio149$ easy_install ReportLab
Searching for ReportLab
Reading http://pypi.python.org/simple/ReportLab/
Reading http://www.reportlab.com/
Best match: reportLab 2.3
Downloading http://pypi.python.org/packages/source/r/reportlab/reportLab-2.3.zip#md5=7d98b26fa287a9e4be4d35d682ce64ac
Processing reportLab-2.3.zip
Running ReportLab_2_3/setup.py -q bdist_egg --dist-dir
/tmp/easy_install-ZZcgFG/ReportLab_2_3/egg-dist-tmp-FqKULE
################################################
#Attempting install of _rl_accel, sgmlop & pyHnj
#extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel'
################################################
################################################
#Attempting install of _renderPM
#extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/renderPM'
# installing with freetype version 21
################################################
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
In function ?hex32?:
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:793:
warning: format ?%8.8X? expects type ?unsigned int?, but argument 3
has type ?long unsigned int?
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
In function ?_instanceStringWidthU?:
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1200:warning:
pointer targets in assignment differ in signedness
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?f? may be used uninitialized in this function
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?t? may be used uninitialized in this function
/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
?L? may be used uninitialized in this function
/usr/bin/ld: cannot find -l_renderPM_libart
collect2: ld returned 1 exit status
error: Setup script exited with error: command 'gcc' failed with exit status 1
(testbio149)vicky at maricurie:~/Public/testbio149$


From gagsl-py2 at yahoo.com.ar  Sun Feb 22 01:52:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 04:52:46 -0200
Subject: Find the location of a loaded module
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
	<gnpbes$ics$1@ger.gmane.org>
Message-ID: <op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 14:51:40 -0200, <rdmurray at bitdance.com> escribi?:

> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
>> <aaron.hildebrandt at gmail.com> escribi=F3:
>>
>> > So, the problem lies with how Python cached the modules in memory.
>> > Yes, the modules were in two different locations and yes, the one that
>> > I specified using its direct path should be the one loaded. The
>> > problem is, the module isn't always loaded -- if it's already in
>> > memory, it'll use that instead. And since the modules had the same
>> > name, Python wouldn't distinguish between them, even though they
>> > weren't exactly the same.
>>
>> Yes, that's how import works. It's barely documented, and you finally
>> learned it the hard way...
>
> I'd argue a little bit with "barely documented".  In the reference, the
> discussion of the import statement starts off saying:
>
>     Import statements are executed in two steps: (1) find a module,
>     and initialize it if necessary; (2) define a name or names in the
>     local namespace (of the scope where the import statement occurs).
>
> The third paragraph then says:
>
>     The system maintains a table of modules that have been or are being
>     initialized, indexed by module name. This table is accessible as
>     sys.modules. When a module name is found in this table, step (1)
>     is finished.
>
> That is pretty up front and unambiguous documentation.

Sure? At a minimum, it doesn't define what "module name" means (isnt't so  
easy). It does not describe correctly how packages are handled, nor dotted  
names that aren't packages. It does not describe sys.meta_path nor  
sys.path_hooks, than can *radically* alter things. It does not describe  
absolute vs. relative imports, nor the "mix" of them in 2.x. It doesn't  
menction the *caller* module as relevant.

> However, the consequences of that statement won't be immediately clear
> on first reading.  I think it would have cleared up Aaron's confusion
> if he'd happened to think to read it.  But since he knew the syntax
> of the import statement already, I'm not surprised he did not read it.
>
> The Tutorial, in the section on modules and import, says:
>
>     A module can contain executable statements as well as function
>     definitions. These statements are intended to initialize the
>     module. They are executed only the first time the module is imported
>     somewhere.
>
> This is considerably less precise, if more superficially understandable.
> I wonder if it would be worth expanding on that statement to mention
> that the module is not even looked for on disk if a module by that
> name has already been imported.

If only that were true... Importers can do almost anything they want. The  
behaviour you describe is only what happens when a) there are no meta_path  
hooks installed, b) there are no path_hooks involved, c) __import__ has  
not been replaced, and d) you are importing a module from the filesystem.

This is what I call "barely documented".

-- 
Gabriel Genellina



From steve at pearwood.info  Sun Feb 22 01:54:41 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 22 Feb 2009 17:54:41 +1100
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
	<5a2e2b9c-12d6-4606-9dff-0d7f4f9642c1@q9g2000yqc.googlegroups.com>
Message-ID: <01b0ec24$0$20612$c3e8da3@news.astraweb.com>

Paddy3118 wrote:

> Ethan,
> Knights are true and seek the light. Evil trolls seek the night and so
> their hour is false.
> 
> ;-)

That's speciest *and* lightist. There's nothing wrong with avoiding the evil
burning day star, that's practically de rigour for programmers.


*wink*


-- 
Steven







From intelliminer at gmail.com  Sun Feb 22 02:08:32 2009
From: intelliminer at gmail.com (intelliminer at gmail.com)
Date: Sat, 21 Feb 2009 23:08:32 -0800 (PST)
Subject: Python dictionary size/entry limit?
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
Message-ID: <006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>

On Feb 21, 6:47?pm, Stefan Behnel <stefan... at behnel.de> wrote:
> intellimi... at gmail.com wrote:
> > I wrote a script to process textual data and extract phrases from
> > them, storing these phrases in a dictionary. It encounters a
> > MemoryError when there are about 11.18M keys in the dictionary, and
> > the size is about 1.5GB.
> > [...]
> > I have 1GB of pysical memory and 3GB in pagefile. Is there a limit to
> > the size or number of entries that a single dictionary can possess? By
> > searching on the web I can't find a clue why this problem occurs.
>
> Python dicts are only limited by what your OS returns as free memory.
> However, when a dict grows, it needs to resize, which means that it has to
> create a bigger copy of itself and redistribute the keys. For a dict that
> is already 1.5GB big, this can temporarily eat a lot more memory than you
> have, at least more than two times as much as the size of the dict itself.
>
> You may be better served with one of the dbm databases that come with
> Python. They live on-disk but do the usual in-memory caching. They'll
> likely perform a lot better than your OS level swap file.
>
> Stefan

Ummm, I didn't know about the dbm databases. It seems there are many
different
modules for this kind of tasks: gdbm, berkeley db, cdb, etc. I'm
needing to implement
a constant hashtable with a large number of keys, but only a small
fraction of them
will be accessed frequently, the read speed is crucial. It would be
ideal if
the implementation caches all the frequently used key/value pairs in
memory. Which
module should I use? And is there a way to specify the amount of
memory it uses for caching?
BTW, the target platform is Linux.

Thank you.


From gagsl-py2 at yahoo.com.ar  Sun Feb 22 02:20:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 05:20:31 -0200
Subject: datetime.time and midnight
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
Message-ID: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>

En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
escribi?:

> Ethan Furman wrote:
>> Greetings, List!
>>  I was curious if anyone knew the rationale behind making midnight  
>> False?
>>  --> import datetime
>> --> midnight = datetime.time(0,0,0)
>> --> bool(midnight)
>> False
>>  To my way of thinking, midnight does actually exist so it should be  
>> true.  If datetime.time was measuring an *amount* of time, rather than  
>> a certain point during the day, then a time of 0:0:0 should certainly  
>> be False as it would mean no time had passed.  However, since midnight  
>> does indeed exist (as many programmers have observed when deadlines  
>> approach ;) I would think it should be true.
>>
> I think it's because midnight is to the time of day what zero is to
> integers, or an empty string is to strings, or an empty container ...

So chr(0) should be False too...

-- 
Gabriel Genellina



From mail at microcorp.co.za  Sun Feb 22 02:29:21 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 22 Feb 2009 09:29:21 +0200
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>
	<gnpee3$r69$1@ger.gmane.org>
Message-ID: <00d501c994c8$d8eab400$0d00a8c0@hendrik>

"Christian Heimes" <lis....s.de> wrote:

> John Nagle wrote
> >    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
> > really
> > dumb.  There's no old code using "bytes".  So converting code to 2.6 means
> > it has to be converted AGAIN for 3.0.  That's a good reason to ignore
> > 2.6 as
> > defective.
> 
> Please don't call something dumb that you don't fully understand. It's
> offenses the people who have spent lots of time developing Python --
> personal, unpaid and voluntary time!

Crying out;  "Please do not criticise me, I am doing it for free!" does
not justify delivering sub standard work - that is the nature of the
open source process - if you lift your head and say or do something,
there are bound to be some objections - some thoughtful and valid,
and others merely carping.  Being sensitive about it serves no purpose.

> I can assure, the bytes alias and b'' alias have their right to exist.

This is not a helpful response - on the surface JN has a point - If
you have to go through two conversions, then 2.6 does not achieve
what it appears to set out to do.  So the issue is simple:

- do you have to convert twice?
- If yes - why? - as he says - there exists no prior code,
  so there seems to be no reason not to make it identical
  to 3.0

The response answers neither of these valid concerns.

- Hendrik



From gagsl-py2 at yahoo.com.ar  Sun Feb 22 02:34:02 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 22 Feb 2009 05:34:02 -0200
Subject: Python 3 and easygui problem
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
Message-ID: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>

En Sun, 22 Feb 2009 03:05:51 -0200, Chris Rebert <clp2 at rebertia.com>  
escribi?:

> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
> <peter.anderson at internode.on.net> wrote:
>> I have just installed Python 3. I have been using Tkinter and easygui  
>> (with
>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>> existing scripts to Python 3 and discovered problems with easygui.
>>
>> I was using the following script for testing:
> <snip>
>
>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in  
>> __choicebox
>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive  
>> sort
>> TypeError: must use keyword argument for key function
>
> Change the line to
>
> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))
>
> Note the "key=". The calling sequence for .sort() changed in Python
> 3.0 to make 'key' a keyword-only argument (I think).

That's very short-lived; cmp is gone in 3.0.1 (should not have existed in  
3.0 in the first place).
Try with:
choices.sort(key=str.lower)

-- 
Gabriel Genellina



From mail at microcorp.co.za  Sun Feb 22 03:09:39 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Sun, 22 Feb 2009 10:09:39 +0200
Subject: `high overhead of multiple Python processes' (was:
	Willmultithreading make python less popular?)
References: <3a138978-4545-40ca-bcb6-1e3937ac2df8@j38g2000yqa.googlegroups.com><28e3612d-2e91-4a91-82cb-5fb2deda95fd@q9g2000yqc.googlegroups.com><d4e81b8a-b8f0-4814-85db-36071b5b2d10@u8g2000prd.googlegroups.com><04b5d5ed-0d0b-42da-9181-bdb61c34f185@g38g2000yqd.googlegroups.com><6b73fa70-04d9-456c-b4da-bb1e62877f24@j39g2000yqn.googlegroups.com><mailman.241.1235048289.11746.python-list@python.org><4d937932-b55a-4a66-b220-f915708bb0ce@h5g2000yqh.googlegroups.com><d544d846-15ac-446e-a77f-cede8fcf9f27@m40g2000yqh.googlegroups.com><7x8wo2kwoz.fsf@ruckus.brouhaha.com><975d0b81-0810-43c2-9734-b7a5a890e431@k19g2000prh.googlegroups.com><7x3aeadqlo.fsf@ruckus.brouhaha.com><87mycfczvd.fsf_-_@slice.rozzin.com>
	<7xfxi75tzg.fsf@ruckus.brouhaha.com>
Message-ID: <00d601c994c8$d9ee1a40$0d00a8c0@hendrik>

"Paul Rubin" <http://phr.cx at NOSPAM.invalid> wrote:

> The cost of messing with the multiprocessing module instead of having
> threads work properly, and the overhead of serializing Python data
> structures to send to another process by IPC, instead of using the
> same object in two threads.  Also, one way I often use threading is by
> sending function objects to another thread through a Queue, so the
> other thread can evaluate the function.  I don't think multiprocessing
> gives a way to serialize functions, though maybe something like it
> can be done at higher nuisance using classes.

There are also Pyro and xmlrpc and shm. - all of them more apparent
hassle than threads, and all of them better able to exploit parallelism.

That said, this has made me think the following:

<conjecture>
It is an error to pass anything but plain data between processes,
as anything else does not scale easily.

Passing plain data between processes means either serialising
the data and using channels such as pipes or sockets, or 
passing a pointer to a shared memory block through a similar
channel.

Following this leads to a clean design, while attempting to pass
higher order stuff quickly leads to convoluted code when
you try to make things operate in parallel.
<!conjecture>

The above can be crudely summed up as:

You can share and pass data, but you should not pass 
or share code between processes.

Now the above is congruent with my own experience, 
but I wonder if it is generally applicable.

- Hendrik




From w_a_x_man at yahoo.com  Sun Feb 22 03:13:11 2009
From: w_a_x_man at yahoo.com (William James)
Date: 22 Feb 2009 08:13:11 GMT
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70>
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com>
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<gktf6f$7ac$1@news.motzarella.org>
Message-ID: <gnr1en02fh6@enews2.newsguy.com>

Andr? Thieme wrote:

> (map #(map (fn [s] (Integer/parseInt s)) (.split % "\\s")) (line-seq
> (reader "blob.txt")))

An error results:

java.lang.Exception: Unable to resolve symbol: reader in this context

This works:

(map #(map (fn [s] (Integer/parseInt s)) (.split % "\\s"))
  (.split (slurp "junk") "\r?\n"))


From dickinsm at gmail.com  Sun Feb 22 04:18:21 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 22 Feb 2009 01:18:21 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
Message-ID: <0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>

On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:

> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False

I'd call this a bug.

Mark


From Ron.Barak at lsi.com  Sun Feb 22 04:37:38 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 09:37:38 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>

Hi Chris,

> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Thursday, February 19, 2009 22:58
> To: Barak, Ron
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi,
> >
> > I have a class derived from two parents (in blue below),
> which gives
> > me the following error:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
> > last):
> >   File "./failover_pickle_demo09.py", line 291, in <module>
> >     class ListControl(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> >     metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases Googling
> > suggested I should add from noconflict import classmaker and
> >
> > __metaclass__=classmaker()
> > to this class.
> >
> > However, I don't seem able to find where to get the
> noconflict module from.
> >
> > Do any of you where noconflict  could be downloaded/installed from ?
>
> From what I could google, you should in theory be able to fix
> the problem (without using any 3rd party module) by doing:
>
> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>     pass
>
> class ListControl(wx.Frame, CopyAndPaste):
>     __metaclass__ = ListControlMeta
>     #rest of class...
>
> Cheers,
> Chris

Applying your suggestion:

class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
    pass

class ListControl(wx.Frame, CopyAndPaste):
    def __init__(self, parent, id, title, list, max_list_width, log_stream, style=wx.DEFAULT_FRAME_STYLE):

        __metaclass__= ListControlMeta

        wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1), style=style)
        self.list = list
        self.log_stream = log_stream
        self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT | wx.LC_NO_HEADER)
        self.list_ctrl.InsertColumn(0, title)
        for i,line_ in enumerate(list):
            self.list_ctrl.InsertStringItem(i, line_)
                ...

I get:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 319, in <module>
    class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

So, back to trying to understand...

Thanks and bye,
Ron.
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From clp2 at rebertia.com  Sun Feb 22 04:47:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 01:47:38 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
Message-ID: <50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:37 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Chris,
>
>> -----Original Message-----
>> From: chris at rebertia.com [
> mailto:chris at rebertia.com] On
>> Behalf Of Chris Rebert
>> Sent: Thursday, February 19, 2009 22:58
>> To: Barak, Ron
>> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
>> Subject: Re: "metaclass conflict" error: where is noconflict ?
>>
>> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
>> > Hi,
>> >
>> > I have a class derived from two parents (in blue below),
>> which gives
>> > me the following error:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 291, in <module>
>> >     class ListControl(wx.Frame, CopyAndPaste):
>> > TypeError: Error when calling the metaclass bases
>> >     metaclass conflict: the metaclass of a derived class must be a
>> > (non-strict) subclass of the metaclasses of all its bases Googling
>> > suggested I should add from noconflict import classmaker and
>> >
>> > __metaclass__=classmaker()
>> > to this class.
>> >
>> > However, I don't seem able to find where to get the
>> noconflict module from.
>> >
>> > Do any of you where noconflict  could be downloaded/installed from ?
>>
>> From what I could google, you should in theory be able to fix
>> the problem (without using any 3rd party module) by doing:
>>
>> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>>     pass
>>
>> class ListControl(wx.Frame, CopyAndPaste):
>>     __metaclass__ = ListControlMeta
>>     #rest of class...
>>
>> Cheers,
>> Chris
>
> Applying your suggestion:
>
> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>     pass
>
> class ListControl(wx.Frame, CopyAndPaste):
>     def __init__(self, parent, id, title, list, max_list_width, log_stream,
> style=wx.DEFAULT_FRAME_STYLE):
>
>         __metaclass__= ListControlMeta
>
>         wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> style=style)
>         self.list = list
>         self.log_stream = log_stream
>         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
> wx.LC_NO_HEADER)
>         self.list_ctrl.InsertColumn(0, title)
>         for i,line_ in enumerate(list):
>             self.list_ctrl.InsertStringItem(i, line_)
>                 ...
>
> I get:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 319, in <module>
>     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> TypeError: Error when calling the metaclass bases
>     multiple bases have instance lay-out conflict

>From what I recall, that basically means that type(wx.Frame) and
type(CopyAndPaste) are both C classes that are are mutually
incompatible. It's basically the same reason you can't subclass from
both `list` and `dict` or two other built-in types (you get the exact
same error).

Sounds like the only way to workaround this would be to do some coding
in C or to use composition rather than inheritance for one of
ListControl's superclasses.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dickinsm at gmail.com  Sun Feb 22 04:47:54 2009
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sun, 22 Feb 2009 01:47:54 -0800 (PST)
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org> 
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
Message-ID: <d0b9de0b-ad07-4565-87e0-6e49431f405b@l16g2000yqo.googlegroups.com>

On Feb 22, 9:18?am, Mark Dickinson <dicki... at gmail.com> wrote:
> On Feb 21, 10:44?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> > --> midnight = datetime.time(0,0,0)
> > --> bool(midnight)
> > False
>
> I'd call this a bug.

...although looking at the source (see the function
time_nonzero in Modules/datetimemodule.c), this
behaviour is clearly intentional.  So it's not a bug;
merely a questionable design decision.  :)

Mark



From jdigital2121 at yahoo.com  Sun Feb 22 04:54:58 2009
From: jdigital2121 at yahoo.com (jeff)
Date: Sun, 22 Feb 2009 01:54:58 -0800 (PST)
Subject: ftpslib caveat solution?
Message-ID: <605090.67543.qm@web32805.mail.mud.yahoo.com>

The only python library that I am aware of that supports ftp + TLS is ftpslib, which is also included with M2Crypto. However, as stated in the README, there is one major caveat. Quote:
"""

The end-of-file marker for binary data transfers is sent by closing the
connection.  Many FTP servers close the TCP socket without shutting down the
TLS connection.  ftpslib attempts to avoid this by using the method in
test_ftpslib.py attached to Python bug 978833, overriding retrbinary to read
from the socket's makefile wrapper instead of the socket itself.  Although
this appears to work for the builtin socket.ssl and M2Crypto, it is
conceivable for a particular SSL implementation to still throw an exception in
this case, and, regardless, the issue is still exposed when using ntransfercmd
outside of retrbinary.  Note that if an exception is thrown in retrbinary, the
response from the last RETR will not be read, causing any future commands to
be one response behind.  This is especially troublesome if using passive FTP,
as the FTP class will be unable to parse the 227 response to future PASV
commands.

"""

Has anyone happened to figure out a more elegant solution to this? More specifically, the part about responses being
1 response behind when an exception is thrown, thus making this module unstable when working with a pasv FTP. Any
insight to solving this problem would be much appreciated.

Cheers,
Jeff
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From marcel.luethi at mlsystems.ch  Sun Feb 22 05:55:51 2009
From: marcel.luethi at mlsystems.ch (Marcel Luethi)
Date: Sun, 22 Feb 2009 11:55:51 +0100
Subject: Python AppStore / Marketplace
Message-ID: <46ed0da80902220255s2ce0182dl28af84dd335aa546@mail.gmail.com>

Dear Community

Now I'm standing here, having this great idea for a brand new rocking app...
But where do I start? I want it to be multi-platform (Linux, Mac OS X,
Windows). It should be easy to install and upgrade. It should be
self-contained, independent of an already installed Python. And of course -
the world should be able to find it!

So what do I do? I'm studying all the possibilities to make it
self-contained (virtualenv, InstantDjango, PortablePython...), searching for
installers (PyInstaller, EasyInstall, ...), looking into making it
executable on every platform (py2exe, py2app, cx_Freeze, ...), analyzing all
GUI frameworks (wxPython, PyGTK, PyQt, ...), investigating all hosting
providers (Google Code, SourceForge, ...) and so on and so forth.

This is not easy at all!

Using my iPhone I suddenly realize how easy it is to find applications in
Apple's AppStore. How easy and fast it is to install or de-install an app.
My iPhone even checks in the background if there is an upgrade which could
be installed painlessly.

Then I see VMware's Virtual Appliance Marketplace, where you can download
already pre-configured "appliances" for all kind of stuff. You can even
download a basic appliance, install and configure your servers and tools -
and upload it again, so that others can profit of your work.

Unfortunately there's nothing like this in the Python world...

My idea: what about having a beefed up Cheeseshop for Python apps and an
accompanying client app kind of iTunes for Python apps?

The server side could be easily implemented with any of the current web
frameworks. It's simply a management platform for the app packages
(descriptions, versions, platforms, licenses, user's comments, number of
downloads, ...) and the package files themselves.
It should be definitely hosted by the PSF I think.

The multi-platform client should be intuitively and elegantly allow app
browsing, downloading and installing those Python apps. In that respect it
is sort of a Linux package manager (Synaptic, YUM, ...). But this is only
the end-user related stuff. Furthermore it should allow to create new apps
(probably based on a previously downloaded base app), package and upload
them again (kind of Google AppEngine Launcher). Those base packages should
include some basic management framework (for installation and configuration)
and hopefully soon after the release of this platform they will be created
in a broad variety to allow app developers to choose among many
Python-version/platform/GUI/...-combinations.

IMHO an architecture like this would greatly enhance the productivity of the
whole Python community by capitalizing the knowledge of many Python
specialists. I don't have to find/install/configure all the basic stuff
myself (see above) to build my app. But I can concentrate on my app because
I'm standing on the shoulders of giants.

I believe it also would make Python as a great platform more visible to the
world - because there is only one place you have to go...


What do you think???
Is this crazy??? Or simply stupid?
Or is this the way to world domination...? ;-)


Unfortunately I'm not expert enough to build such a system - but if there is
enough interest in the community I gladly would like to help.

Marcel


PS:
Naming is important! "Python AppStore" or "Python App Marketplace" is nice -
but I would prefer something like "Python Bazaar" or "Python Souq" to
emphasize the community aspect.
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From matthew at woodcraft.me.uk  Sun Feb 22 06:23:18 2009
From: matthew at woodcraft.me.uk (Matthew Woodcraft)
Date: Sun, 22 Feb 2009 11:23:18 GMT
Subject: "Byte" type?
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>
	<gn9621$2hk$1@ger.gmane.org>
	<mailman.9565.1234708354.3487.python-list@python.org>
	<499841bf$0$1624$742ec2ed@news.sonic.net>
	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net> <gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
Message-ID: <87eixq4swp.fsf@golux.woodcraft.me.uk>

"Hendrik van Rooyen" <mail at microcorp.co.za> writes:

> "Christian Heimes" <lis....s.de> wrote:
> on the surface JN has a point - If you have to go through two
> conversions, then 2.6 does not achieve what it appears to set out to
> do. So the issue is simple:

> - do you have to convert twice?
> - If yes - why? - as he says - there exists no prior code,
>   so there seems to be no reason not to make it identical
>   to 3.0

You don't have to convert twice. You don't have to use 'bytes' in 2.6 at
all. It's there in 2.6 to make some strategies for transition to 3.x
easier.

Note that 'bytes' is not (as JN asserted) a keyword, so its inclusion
won't break existing programs which were using it as an identifier.

-M-


From marcel.luethi at gmail.com  Sun Feb 22 06:24:26 2009
From: marcel.luethi at gmail.com (Marcel Luethi)
Date: Sun, 22 Feb 2009 03:24:26 -0800 (PST)
Subject: Python AppStore / Marketplace
Message-ID: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>

Dear Community

Now I'm standing here, having this great idea for a brand new rocking
app...
But where do I start? I want it to be multi-platform (Linux, Mac OS X,
Windows). It should be easy to install and upgrade. It should be self-
contained, independent of an already installed Python. And of course -
the world should be able to find it!

So what do I do? I'm studying all the possibilities to make it self-
contained (virtualenv, InstantDjango, PortablePython...), searching
for installers (PyInstaller, EasyInstall, ...), looking into making it
executable on every platform (py2exe, py2app, cx_Freeze, ...),
analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
investigating all hosting providers (Google Code, SourceForge, ...)
and so on and so forth.

This is not easy at all!

Using my iPhone I suddenly realize how easy it is to find applications
in Apple's AppStore. How easy and fast it is to install or de-install
an app. My iPhone even checks in the background if there is an upgrade
which could be installed painlessly.

Then I see VMware's Virtual Appliance Marketplace, where you can
download already pre-configured "appliances" for all kind of stuff.
You can even download a basic appliance, install and configure your
servers and tools - and upload it again, so that others can profit of
your work.

Unfortunately there's nothing like this in the Python world...

My idea: what about having a beefed up Cheeseshop for Python apps and
an accompanying client app kind of iTunes for Python apps?

The server side could be easily implemented with any of the current
web frameworks. It's simply a management platform for the app packages
(descriptions, versions, platforms, licenses, user's comments, number
of downloads, ...) and the package files themselves.
It should be definitely hosted by the PSF I think.

The multi-platform client should be intuitively and elegantly allow
app browsing, downloading and installing those Python apps. In that
respect it is sort of a Linux package manager (Synaptic, YUM, ...).
But this is only the end-user related stuff. Furthermore it should
allow to create new apps (probably based on a previously downloaded
base app), package and upload them again (kind of Google AppEngine
Launcher). Those base packages should include some basic management
framework (for installation and configuration) and hopefully soon
after the release of this platform they will be created in a broad
variety to allow app developers to choose among many Python-version/
platform/GUI/...-combinations.

IMHO an architecture like this would greatly enhance the productivity
of the whole Python community by capitalizing the knowledge of many
Python specialists. I don't have to find/install/configure all the
basic stuff myself (see above) to build my app. But I can concentrate
on my app because I'm standing on the shoulders of giants.

I believe it also would make Python as a great platform more visible
to the world - because there is only one place you have to go...


What do you think???
Is this crazy??? Or simply stupid?
Or is this the way to world domination...? ;-)


Unfortunately I'm not expert enough to build such a system - but if
there is enough interest in the community I gladly would like to help.

Marcel


PS:
Naming is important! "Python AppStore" or "Python App Marketplace" is
nice - but I would prefer something like "Python Bazaar" or "Python
Souq" to emphasize the community aspect.


From Ron.Barak at lsi.com  Sun Feb 22 06:31:01 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 11:31:01 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>

Hi Chris, 

> -----Original Message-----
> From: Chris Rebert [mailto:clp2 at rebertia.com] 
> Sent: Sunday, February 22, 2009 11:48
> To: Barak, Ron
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
> 
> On Sun, Feb 22, 2009 at 1:37 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi Chris,
> >
> >> -----Original Message-----
> >> From: chris at rebertia.com [
> > mailto:chris at rebertia.com] On
> >> Behalf Of Chris Rebert
> >> Sent: Thursday, February 19, 2009 22:58
> >> To: Barak, Ron
> >> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> >> Subject: Re: "metaclass conflict" error: where is noconflict ?
> >>
> >> On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron 
> <Ron.Barak at lsi.com> wrote:
> >> > Hi,
> >> >
> >> > I have a class derived from two parents (in blue below),
> >> which gives
> >> > me the following error:
> >> >
> >> > $ python -u ./failover_pickle_demo09.py Traceback (most 
> recent call
> >> > last):
> >> >   File "./failover_pickle_demo09.py", line 291, in <module>
> >> >     class ListControl(wx.Frame, CopyAndPaste):
> >> > TypeError: Error when calling the metaclass bases
> >> >     metaclass conflict: the metaclass of a derived class 
> must be a
> >> > (non-strict) subclass of the metaclasses of all its 
> bases Googling 
> >> > suggested I should add from noconflict import classmaker and
> >> >
> >> > __metaclass__=classmaker()
> >> > to this class.
> >> >
> >> > However, I don't seem able to find where to get the
> >> noconflict module from.
> >> >
> >> > Do any of you where noconflict  could be 
> downloaded/installed from ?
> >>
> >> From what I could google, you should in theory be able to fix the 
> >> problem (without using any 3rd party module) by doing:
> >>
> >> class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >>     pass
> >>
> >> class ListControl(wx.Frame, CopyAndPaste):
> >>     __metaclass__ = ListControlMeta
> >>     #rest of class...
> >>
> >> Cheers,
> >> Chris
> >
> > Applying your suggestion:
> >
> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >     pass
> >
> > class ListControl(wx.Frame, CopyAndPaste):
> >     def __init__(self, parent, id, title, list, max_list_width, 
> > log_stream,
> > style=wx.DEFAULT_FRAME_STYLE):
> >
> >         __metaclass__= ListControlMeta
> >
> >         
> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> > style=style)
> >         self.list = list
> >         self.log_stream = log_stream
> >         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
> > wx.LC_NO_HEADER)
> >         self.list_ctrl.InsertColumn(0, title)
> >         for i,line_ in enumerate(list):
> >             self.list_ctrl.InsertStringItem(i, line_)
> >                 ...
> >
> > I get:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call 
> > last):
> >   File "./failover_pickle_demo09.py", line 319, in <module>
> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> > TypeError: Error when calling the metaclass bases
> >     multiple bases have instance lay-out conflict
> 
> >From what I recall, that basically means that type(wx.Frame) and
> type(CopyAndPaste) are both C classes that are are mutually 
> incompatible. It's basically the same reason you can't 
> subclass from both `list` and `dict` or two other built-in 
> types (you get the exact same error).
> 
> Sounds like the only way to workaround this would be to do 
> some coding in C or to use composition rather than 
> inheritance for one of ListControl's superclasses.

The wx.Frame may be coded in C, but the CopyAndPaste class, which I wrote, is not (see it's listing below).
Could you have a look at the CopyAndPaste class, and see if something in its construction strikes you as susspicious ?

Thanks,
Ron.

$ cat ./CopyAndPaste.py
#!/usr/bin/env python

import wx

class CopyAndPaste():
    def __init__(self):
        pass

    def set_copy_and_paste(self):
        """
        Setting clipboard copy-and-pasting (only copying from the application to the
        clipboard is supported).
        The "menu" menu is hidded, and is only there to facilitate the acceleration table.
        Both CTRL-C and CTRL-Ins are supported.
        """
        #print line()+". set_copy_and_paste started"
        #print line()+". self.__dict__:",self.__dict__
        menu = wx.Menu()        
        copy_ = menu.Append(-1, "&Copy\tCtrl-Ins") # Copy with accelerator
        minimize_ = menu.Append(-1, "Minimize") # 
        close_ = menu.Append(-1, "Close window\tCtrl-W") # Close window
        exit_ = menu.Append(-1, "E&xit application\tCtrl-X") # Close window
        """
        #copy2_  = menu.Append(-1, "&Copy\tCtrl-C") # Copy with accelerator
        paste_  = menu.Append(-1, "&Paste\tShift-Ins") # Paste with accelerator
        paste2_  = menu.Append(-1, "&Paste\tCtrl-V") # Paste with accelerator
        """
        
        self.Bind(wx.EVT_MENU, self.on_copy, copy_)
        self.Bind(wx.EVT_MENU, self.on_minimize, minimize_)
        self.Bind(wx.EVT_MENU, self.on_close, close_)
        self.Bind(wx.EVT_MENU, self.on_exit, exit_)
        #self.Bind(wx.EVT_MENU, self.on_paste, paste_)
                  
        menuBar = wx.MenuBar()
        self.SetMenuBar(menuBar)

        acceltbl = wx.AcceleratorTable( [
                (wx.ACCEL_CTRL, ord('C'), copy_.GetId()),
                (wx.ACCEL_CTRL, ord('W'), close_.GetId()),
                (wx.ACCEL_CTRL, ord('X'), exit_.GetId()),
                (wx.ACCEL_CTRL, ord('Q'), exit_.GetId()),
                (wx.ACCEL_CTRL, wx.WXK_INSERT, copy_.GetId()),
                (wx.ACCEL_CTRL, wx.WXK_NUMPAD_INSERT, copy_.GetId()),
                #(wx.ACCEL_CTRL, ord('V'), paste_.GetId()),
                #(wx.ACCEL_SHIFT, wx.WXK_INSERT, paste_.GetId()),
            ])
        self.SetAcceleratorTable(acceltbl)

        # Setting popup menu

        self.popupmenu = menu
        self.Bind(wx.EVT_CONTEXT_MENU, self.on_show_popup)

    """    
    def on_paste(self, evt):
        wx.MessageBox("You selected 'paste'")
        """

    
    def on_show_popup(self, evt):
        pos = evt.GetPosition()
        pos = self.list_ctrl.ScreenToClient(pos)
        self.PopupMenu(self.popupmenu, pos)

    def get_data_for_clipboard(self,format="text"):
        """
        Return data ready to be copied to the clipboard.

        This is an abstract method - concrete subclasses must override this.

        Sample implementation of get_data_for_clipboard() is:

        def get_data_for_clipboard(self,format="text"):
            first_selected = self.list_ctrl.GetFirstSelected()
            selected_item_count = self.list_ctrl.GetSelectedItemCount()
            text_for_clipboard = ""
            for i in range(first_selected,first_selected+selected_item_count):
                text_for_clipboard = "%s%s\n" % (text_for_clipboard, self.list_ctrl.GetItemText(i))
            return(text_for_clipboard)   
        """
        raise NotImplementedError

    def on_copy(self, evt):
        """
        """
        text_for_clipboard = self.get_data_for_clipboard()

        data = wx.TextDataObject()
        data.SetText(text_for_clipboard)
        if wx.TheClipboard.Open():
            wx.TheClipboard.SetData(data)
            wx.TheClipboard.Close()
        else:
            wx.MessageBox("Unable to copy to the clipboard", "Error")

    def on_minimize(self, evt):
        self.Iconize()
        #self.parent.Iconize()

    def on_close(self, evt):
        self.Close()
        #self.parent.Close()

    def on_exit(self, evt):
        try:
            self.Parent.Close()
        except AttributeError:
            self.Close()

        
if __name__ == "__main__":

    app = wx.App(redirect=False)
    copy_and_paste = CopyAndPaste()
    app.MainLoop()

> 
> Cheers,
> Chris
> 
> --
> Follow the path of the Iguana...
> http://rebertia.com
> 
> 

From clp2 at rebertia.com  Sun Feb 22 06:57:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 03:57:22 -0800
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
Message-ID: <50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>

On Sun, Feb 22, 2009 at 3:31 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
<snip>
>> > Applying your suggestion:
>> >
>> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>> >     pass
>> >
>> > class ListControl(wx.Frame, CopyAndPaste):
>> >     def __init__(self, parent, id, title, list, max_list_width,
>> > log_stream,
>> > style=wx.DEFAULT_FRAME_STYLE):
>> >
>> >         __metaclass__= ListControlMeta
>> >
>> >
>> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
>> > style=style)
>> >         self.list = list
>> >         self.log_stream = log_stream
>> >         self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT |
>> > wx.LC_NO_HEADER)
>> >         self.list_ctrl.InsertColumn(0, title)
>> >         for i,line_ in enumerate(list):
>> >             self.list_ctrl.InsertStringItem(i, line_)
>> >                 ...
>> >
>> > I get:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 319, in <module>
>> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
>> > TypeError: Error when calling the metaclass bases
>> >     multiple bases have instance lay-out conflict
>>
>> >From what I recall, that basically means that type(wx.Frame) and
>> type(CopyAndPaste) are both C classes that are are mutually
>> incompatible. It's basically the same reason you can't
>> subclass from both `list` and `dict` or two other built-in
>> types (you get the exact same error).
>>
>> Sounds like the only way to workaround this would be to do
>> some coding in C or to use composition rather than
>> inheritance for one of ListControl's superclasses.
>
> The wx.Frame may be coded in C, but the CopyAndPaste class, which I wrote, is not (see it's listing below).
> Could you have a look at the CopyAndPaste class, and see if something in its construction strikes you as susspicious ?
>
> Thanks,
> Ron.
>
> $ cat ./CopyAndPaste.py
> #!/usr/bin/env python
>
> import wx
>
> class CopyAndPaste():

You need to subclass 'object' so as to make CopyAndPaste a new-style
class. This may or may not resolve the error, but you should be doing
it either way.

class CopyAndPaste(object):

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From hniksic at xemacs.org  Sun Feb 22 07:05:24 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 22 Feb 2009 13:05:24 +0100
Subject: "metaclass conflict" error: where is noconflict ?
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
Message-ID: <87k57iu16j.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> class CopyAndPaste():

CopyAndPaste is an old-style class.  Make it a new-style class, and
you'll probably be able to inherit from it and wx.Frame without
explicitly creating a new metaclass.


From peter.anderson at internode.on.net  Sun Feb 22 07:05:32 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Sun, 22 Feb 2009 23:05:32 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A13F8C.1000506@internode.on.net>

Gabriel Genellina said:

That's very short-lived; cmp is gone in 3.0.1 (should not have existed in 3.0 in the first place).
Try with:
choices.sort(key=str.lower)


Gabriel,

That's worked fine - thank you. I think I now have a version of 
easygui.py that works with Python 3, probably needs a bit more testing.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From bockman at virgilio.it  Sun Feb 22 07:53:23 2009
From: bockman at virgilio.it (Francesco Bochicchio)
Date: Sun, 22 Feb 2009 13:53:23 +0100
Subject: python contextmanagers and ruby blocks
References: <0ca5a9c3-03d3-4824-9c66-c1a3604aa98b@x9g2000yqk.googlegroups.com>
	<pan.2009.02.21.11.00.48.261043@virgilio.it>
	<aac004f8-2077-4e53-a865-47c24f7f523a@t3g2000yqa.googlegroups.com>
	<gnpeda$4tp$1@panix3.panix.com>
Message-ID: <pan.2009.02.22.12.53.23.43776@virgilio.it>

On Sat, 21 Feb 2009 09:42:02 -0800, Aahz wrote:

> In article <aac004f8-2077-4e53-a865-47c24f7f523a at t3g2000yqa.googlegroups.com>,
> Alia K  <alia_khouri at yahoo.com> wrote:
>>
>>Nevertheless, I remain curious about whether once can use the
>>contextmanager in python to achieve the full power of ruby's blocks...
> 
> Short answer: no
> 
> Longer answer: the way in Python to achieve the full power of Ruby
> blocks is to write a function.

Which was where I was aiming to with my very long-winded post :-)

Ciao
----
FB


From yanegomi at gmail.com  Sun Feb 22 08:07:57 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Sun, 22 Feb 2009 05:07:57 -0800
Subject: Problem trying to install ReportLab with easy_install
In-Reply-To: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
References: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
Message-ID: <364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>

On Sat, Feb 21, 2009 at 10:06 PM, Sebastian Bassi
<sbassi at clubdelarazon.org> wrote:
> I don't understand what is wrong when I try to install ReportLab. This
> is under Ubuntu and all build packages are installed.
> Here is what I get when trying to install it: (I could install it with
> apt-get, but I am testing virtualenv and easy_install).
>
> (testbio149)vicky at maricurie:~/Public/testbio149$ easy_install ReportLab
> Searching for ReportLab
> Reading http://pypi.python.org/simple/ReportLab/
> Reading http://www.reportlab.com/
> Best match: reportLab 2.3
> Downloading http://pypi.python.org/packages/source/r/reportlab/reportLab-2.3.zip#md5=7d98b26fa287a9e4be4d35d682ce64ac
> Processing reportLab-2.3.zip
> Running ReportLab_2_3/setup.py -q bdist_egg --dist-dir
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/egg-dist-tmp-FqKULE
> ################################################
> #Attempting install of _rl_accel, sgmlop & pyHnj
> #extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel'
> ################################################
> ################################################
> #Attempting install of _renderPM
> #extensions from '/tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/renderPM'
> # installing with freetype version 21
> ################################################
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
> In function ?hex32?:
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:793:
> warning: format ?%8.8X? expects type ?unsigned int?, but argument 3
> has type ?long unsigned int?
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:
> In function ?_instanceStringWidthU?:
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1200:warning:
> pointer targets in assignment differ in signedness
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?f? may be used uninitialized in this function
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?t? may be used uninitialized in this function
> /tmp/easy_install-ZZcgFG/ReportLab_2_3/src/rl_addons/rl_accel/_rl_accel.c:1123:warning:
> ?L? may be used uninitialized in this function
> /usr/bin/ld: cannot find -l_renderPM_libart
> collect2: ld returned 1 exit status
> error: Setup script exited with error: command 'gcc' failed with exit status 1
> (testbio149)vicky at maricurie:~/Public/testbio149$

    It's not building lib_renderPM_libart properly, or it's a typo
that supposed to be librenderPM_libart, or bad LDFLAGS...
    More details need to be provided like an ls of your site-packages
directory and a partial ls of your local library directory (ls
/usr/?local/?lib/lib*render*libart*, etc).

Thanks,
-Garrett


From Ron.Barak at lsi.com  Sun Feb 22 08:14:28 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:14:28 +0000
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>

Hi Chris,

> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Sunday, February 22, 2009 13:57
> To: Barak, Ron
> Cc: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Sun, Feb 22, 2009 at 3:31 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> <snip>
> >> > Applying your suggestion:
> >> >
> >> > class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >> >     pass
> >> >
> >> > class ListControl(wx.Frame, CopyAndPaste):
> >> >     def __init__(self, parent, id, title, list, max_list_width,
> >> > log_stream,
> >> > style=wx.DEFAULT_FRAME_STYLE):
> >> >
> >> >         __metaclass__= ListControlMeta
> >> >
> >> >
> >> > wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1),
> >> > style=style)
> >> >         self.list = list
> >> >         self.log_stream = log_stream
> >> >         self.list_ctrl = wx.ListCtrl(self, -1,
> style=wx.LC_REPORT |
> >> > wx.LC_NO_HEADER)
> >> >         self.list_ctrl.InsertColumn(0, title)
> >> >         for i,line_ in enumerate(list):
> >> >             self.list_ctrl.InsertStringItem(i, line_)
> >> >                 ...
> >> >
> >> > I get:
> >> >
> >> > $ python -u ./failover_pickle_demo09.py Traceback (most
> recent call
> >> > last):
> >> >   File "./failover_pickle_demo09.py", line 319, in <module>
> >> >     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> >> > TypeError: Error when calling the metaclass bases
> >> >     multiple bases have instance lay-out conflict
> >>
> >> >From what I recall, that basically means that type(wx.Frame) and
> >> type(CopyAndPaste) are both C classes that are are mutually
> >> incompatible. It's basically the same reason you can't
> subclass from
> >> both `list` and `dict` or two other built-in types (you
> get the exact
> >> same error).
> >>
> >> Sounds like the only way to workaround this would be to do some
> >> coding in C or to use composition rather than inheritance
> for one of
> >> ListControl's superclasses.
> >
> > The wx.Frame may be coded in C, but the CopyAndPaste class,
> which I wrote, is not (see it's listing below).
> > Could you have a look at the CopyAndPaste class, and see if
> something in its construction strikes you as susspicious ?
> >
> > Thanks,
> > Ron.
> >
> > $ cat ./CopyAndPaste.py
> > #!/usr/bin/env python
> >
> > import wx
> >
> > class CopyAndPaste():
>
> You need to subclass 'object' so as to make CopyAndPaste a
> new-style class. This may or may not resolve the error, but
> you should be doing it either way.
>
> class CopyAndPaste(object):
>
> Cheers,
> Chris
>

Thanks for the super-prompt replies.

Is there a way to ask a class what its metaclasses are ?
(e.g., how to ask wx.Frame what it's metaclass is)


I'm asking, because, even subclassing from object, viz.:

class CopyAndPaste(object):
    def __init__(self):
        pass
...

Still gives me:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 321, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

Bye,
Ron.

> --
> Follow the path of the Iguana...
> http://rebertia.com
>
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From dineshbvadhia at hotmail.com  Sun Feb 22 08:17:39 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sun, 22 Feb 2009 05:17:39 -0800 (PST)
Subject: To unicode or not to unicode
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net> 
	<mailman.330.1235100133.11746.python-list@python.org>
Message-ID: <211f0ece-f29f-43c3-bd50-4c64bdee2087@j35g2000yqh.googlegroups.com>

re: "You should never have to rely on the default encoding. You should
explicitly decode and encode data."

What is the best practice for 1) doing this in Python and 2) for
unicode support ?

I want to standardize on unicode and want to put into place best
Python practice so that we don't have to worry.  Thanks!

Dinesh



On Feb 19, 7:21?pm, Benjamin Peterson <benja... at python.org> wrote:
> Ron Garret <rNOSPAMon <at> flownet.com> writes:
>
>
>
> > I'm writing a little wiki that I call ?Wiki. ?That's a lowercase Greek
> > mu at the beginning (it's pronounced micro-wiki). ?It's working, except
> > that I can't actually enter the name of the wiki into the wiki itself
> > because the default unicode encoding on my Python installation is
> > "ascii". ?So I'm trying to decide on a course of action. ?There seem to
> > be three possibilities:
>
> You should never have to rely on the default encoding. You should explicitly
> decode and encode data.
>
>
>
> > 1. ?Change the code to properly support unicode. ?Preliminary
> > investigations indicate that this is going to be a colossal pain in the
> > ass.
>
> Properly handling unicode may be painful at first, but it will surely pay off in
> the future.



From Ron.Barak at lsi.com  Sun Feb 22 08:29:10 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:29:10 +0000
Subject: How to inherit from two classes without metaclass clashing ?
In-Reply-To: <ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<mailman.289.1235077114.11746.python-list@python.org>
	<ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>

Hi Michele,

I tried understanding how to avoid the metaclasses clashing, and I did read the link you referred to below,
as well as the relevant O'Reilly cookbook chapter (Recipe 20.17. Solving Metaclass Conflicts), but seems I do not understand the correct syntax to use, as I either get

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 323, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

or

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 322, in <module>
    class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

And, mind you, all I wanted to do was inherit from two classes: wxPython's wx.Frame and my CopyAndPaste.

Namely -

I have a subclass of wxPython's wx.Frame called ListControl.
I wanted to add copy (from copy-and-paste) capabilities to this ListControl class.

I changed the header of this class to be:

class ListControl(wx.Frame, CopyAndPaste):

But, the addition of CopyAndPaste to the class parents got me into this quagmire of metaclasses.

Bye,
Ron.


> -----Original Message-----
> From: Michele Simionato [mailto:michele.simionato at gmail.com]
> Sent: Friday, February 20, 2009 07:23
> To: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> On Feb 19, 9:58 pm, Chris Rebert <c... at rebertia.com> wrote:
> > On Thu, Feb 19, 2009 at 5:01 AM, Barak, Ron
> <Ron.Ba... at lsi.com> wrote:
> > > Hi,
> >
> > > I have a class derived from two parents (in blue below),
> which gives
> > > me the following error:
> >
> > > $ python -u ./failover_pickle_demo09.py Traceback (most
> recent call
> > > last):
> > >   File "./failover_pickle_demo09.py", line 291, in <module>
> > >     class ListControl(wx.Frame, CopyAndPaste):
> > > TypeError: Error when calling the metaclass bases
> > >     metaclass conflict: the metaclass of a derived class must be a
> > > (non-strict) subclass of the metaclasses of all its bases
> Googling
> > > suggested I should add from noconflict import classmaker and
> >
> > > __metaclass__=classmaker()
> > > to this class.
> >
> > > However, I don't seem able to find where to get the
> noconflict module from.
> >
> > > Do any of you where noconflict  could be
> downloaded/installed from ?
>
>
> It refers to this cookbook recipe:
> http://code.activestate.com/recipes/204197/
>
> See also the printed cookbook:
>
> http://books.google.it/books?id=1Shx_VXS6ioC&pg=PA786&lpg=PA78
6&dq=python+cookbook+noconflict&source=bl&ots=BB413AZ8R7&sig=cnAB-E9rNFolHBEZQTIm_d4Mj3o&hl=it&ei=GT2eSfCtBdWa_gadppHYCw&sa=X&oi=book_result&resnum=2&ct=result#PPA786,M1

However, there is no module to download, and this is on purpose:
instead of blindly apply a "fix" one should understand what the conflict is: then it is quite easy to solve it by hand. The recipe discussion explains it all.

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From Ron.Barak at lsi.com  Sun Feb 22 08:41:20 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 13:41:20 +0000
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <87k57iu16j.fsf@mulj.homelinux.net>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
	<87k57iu16j.fsf@mulj.homelinux.net>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com>

Hi Hrvoje,

I tried also as follows:

#!/usr/bin/env python

import wx

class CopyAndPaste(object):
    def __init__(self):
        pass

    def set_copy_and_paste(self):
    ...


and CopyAndPaste is being called with:

...
class ListControlMeta(wx.Frame, CopyAndPaste):
    pass

class ListControl(wx.Frame, CopyAndPaste):

    def __init__(self, parent, id, title, list, max_list_width, log_stream, style=wx.DEFAULT_FRAME_STYLE):

        wx.Frame.__init__(self,parent,id,title,size=(max_list_width,-1), style=style)
        self.list = list
        ...

But I'm still getting:

$ python -u ./failover_pickle_demo09.py
Traceback (most recent call last):
  File "./failover_pickle_demo09.py", line 324, in <module>
    class ListControlMeta(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

So, obviously the line in blue is not to Python's liking.

Bye,
Ron.

> -----Original Message-----
> From: Hrvoje Niksic [mailto:hniksic at xemacs.org]
> Sent: Sunday, February 22, 2009 14:05
> To: python-list at python.org
> Subject: Re: "metaclass conflict" error: where is noconflict ?
>
> "Barak, Ron" <Ron.Barak at lsi.com> writes:
>
> > class CopyAndPaste():
>
> CopyAndPaste is an old-style class.  Make it a new-style
> class, and you'll probably be able to inherit from it and
> wx.Frame without explicitly creating a new metaclass.
>
>
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From stef.mientki at gmail.com  Sun Feb 22 08:43:23 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Sun, 22 Feb 2009 14:43:23 +0100
Subject: can error messages be improved or can they be overridden ?
Message-ID: <49A1567B.5020407@gmail.com>

hello,

I often get an error message like this

    self.Brick.Par [ self.EP[2] ]['FileName'] = filename
IndexError: list index out of range

Now it would be very welcome,
if the error message specified which index is out of range,
in this case e.g.,
- specifying the length of self.EP
- specifying the value of self.EP[2]
- specifying the length of self.Brick.Par
etc..

Is there a way to override the error message and provide this information,
or is it impossible ?

And if it's possible, am I the only one who often stumbles about this 
problem ?
(I expect many people must have bounced in this problem before me ;-)

thanks,
Stef Mientki



From steve at holdenweb.com  Sun Feb 22 09:01:43 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:01:43 -0500
Subject: Find the location of a loaded module
In-Reply-To: <op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>	<gnpbes$ics$1@ger.gmane.org>
	<op.upqqp81bx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <gnrls7$vgt$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Sat, 21 Feb 2009 14:51:40 -0200, <rdmurray at bitdance.com> escribi?:
> 
>> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
>>> En Fri, 20 Feb 2009 20:44:21 -0200, Aaron Scott
>>> <aaron.hildebrandt at gmail.com> escribi=F3:
>>>
>>> > So, the problem lies with how Python cached the modules in memory.
>>> > Yes, the modules were in two different locations and yes, the one that
>>> > I specified using its direct path should be the one loaded. The
>>> > problem is, the module isn't always loaded -- if it's already in
>>> > memory, it'll use that instead. And since the modules had the same
>>> > name, Python wouldn't distinguish between them, even though they
>>> > weren't exactly the same.
>>>
>>> Yes, that's how import works. It's barely documented, and you finally
>>> learned it the hard way...
>>
>> I'd argue a little bit with "barely documented".  In the reference, the
>> discussion of the import statement starts off saying:
>>
>>     Import statements are executed in two steps: (1) find a module,
>>     and initialize it if necessary; (2) define a name or names in the
>>     local namespace (of the scope where the import statement occurs).
>>
>> The third paragraph then says:
>>
>>     The system maintains a table of modules that have been or are being
>>     initialized, indexed by module name. This table is accessible as
>>     sys.modules. When a module name is found in this table, step (1)
>>     is finished.
>>
>> That is pretty up front and unambiguous documentation.
> 
> Sure? At a minimum, it doesn't define what "module name" means (isnt't
> so easy). It does not describe correctly how packages are handled, nor
> dotted names that aren't packages. It does not describe sys.meta_path
> nor sys.path_hooks, than can *radically* alter things. It does not
> describe absolute vs. relative imports, nor the "mix" of them in 2.x. It
> doesn't menction the *caller* module as relevant.
> 
>> However, the consequences of that statement won't be immediately clear
>> on first reading.  I think it would have cleared up Aaron's confusion
>> if he'd happened to think to read it.  But since he knew the syntax
>> of the import statement already, I'm not surprised he did not read it.
>>
>> The Tutorial, in the section on modules and import, says:
>>
>>     A module can contain executable statements as well as function
>>     definitions. These statements are intended to initialize the
>>     module. They are executed only the first time the module is imported
>>     somewhere.
>>
>> This is considerably less precise, if more superficially understandable.
>> I wonder if it would be worth expanding on that statement to mention
>> that the module is not even looked for on disk if a module by that
>> name has already been imported.
> 
> If only that were true... Importers can do almost anything they want.
> The behaviour you describe is only what happens when a) there are no
> meta_path hooks installed, b) there are no path_hooks involved, c)
> __import__ has not been replaced, and d) you are importing a module from
> the filesystem.
> 
> This is what I call "barely documented".
> 
Fortunately Brett Cannon has been working hard in this area, and we are
likely to see more straightforward import semantics in the near future.
In my own meanderings through the import system it did seem to me like
something that had grown organically into an arcane and impenetrable
system that was exceedingly difficult to understand.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 22 09:08:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:08:29 -0500
Subject: datetime.time and midnight
In-Reply-To: <49A083DA.7000107@stoneleaf.us>
References: <49A083DA.7000107@stoneleaf.us>
Message-ID: <gnrm8t$2e9$1@ger.gmane.org>

Ethan Furman wrote:
> Greetings, List!
> 
> I was curious if anyone knew the rationale behind making midnight False?
> 
> --> import datetime
> --> midnight = datetime.time(0,0,0)
> --> bool(midnight)
> False
> 
> To my way of thinking, midnight does actually exist so it should be
> true.  If datetime.time was measuring an *amount* of time, rather than a
> certain point during the day, then a time of 0:0:0 should certainly be
> False as it would mean no time had passed.  However, since midnight does
> indeed exist (as many programmers have observed when deadlines approach
> ;) I would think it should be true.

One might ask the rationale behind treating a time as Boolean in the
first place. Let me guess: you are retrieving the times from a database,
and you are testing of the NULL value?

If that's the case, a simple "is not None" will overcome the objection.
Though I do agree it's a little weird for bool(midnight) to return
False. Probably worth a bug report. I imagine it's just returning the
bool of the underlying integer.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Sun Feb 22 09:21:12 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 09:21:12 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
Message-ID: <gnrn0o$4ju$1@ger.gmane.org>

Marcel Luethi wrote:
> Dear Community
> 
> Now I'm standing here, having this great idea for a brand new rocking
> app...
> But where do I start? I want it to be multi-platform (Linux, Mac OS X,
> Windows). It should be easy to install and upgrade. It should be self-
> contained, independent of an already installed Python. And of course -
> the world should be able to find it!
> 
> So what do I do? I'm studying all the possibilities to make it self-
> contained (virtualenv, InstantDjango, PortablePython...), searching
> for installers (PyInstaller, EasyInstall, ...), looking into making it
> executable on every platform (py2exe, py2app, cx_Freeze, ...),
> analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
> investigating all hosting providers (Google Code, SourceForge, ...)
> and so on and so forth.
> 
> This is not easy at all!
> 
> Using my iPhone I suddenly realize how easy it is to find applications
> in Apple's AppStore. How easy and fast it is to install or de-install
> an app. My iPhone even checks in the background if there is an upgrade
> which could be installed painlessly.
> 
> Then I see VMware's Virtual Appliance Marketplace, where you can
> download already pre-configured "appliances" for all kind of stuff.
> You can even download a basic appliance, install and configure your
> servers and tools - and upload it again, so that others can profit of
> your work.
> 
> Unfortunately there's nothing like this in the Python world...
> 
> My idea: what about having a beefed up Cheeseshop for Python apps and
> an accompanying client app kind of iTunes for Python apps?
> 
> The server side could be easily implemented with any of the current
> web frameworks. It's simply a management platform for the app packages
> (descriptions, versions, platforms, licenses, user's comments, number
> of downloads, ...) and the package files themselves.
> It should be definitely hosted by the PSF I think.
> 
> The multi-platform client should be intuitively and elegantly allow
> app browsing, downloading and installing those Python apps. In that
> respect it is sort of a Linux package manager (Synaptic, YUM, ...).
> But this is only the end-user related stuff. Furthermore it should
> allow to create new apps (probably based on a previously downloaded
> base app), package and upload them again (kind of Google AppEngine
> Launcher). Those base packages should include some basic management
> framework (for installation and configuration) and hopefully soon
> after the release of this platform they will be created in a broad
> variety to allow app developers to choose among many Python-version/
> platform/GUI/...-combinations.
> 
> IMHO an architecture like this would greatly enhance the productivity
> of the whole Python community by capitalizing the knowledge of many
> Python specialists. I don't have to find/install/configure all the
> basic stuff myself (see above) to build my app. But I can concentrate
> on my app because I'm standing on the shoulders of giants.
> 
> I believe it also would make Python as a great platform more visible
> to the world - because there is only one place you have to go...
> 
> 
> What do you think???
> Is this crazy??? Or simply stupid?
> Or is this the way to world domination...? ;-)
> 
> 
> Unfortunately I'm not expert enough to build such a system - but if
> there is enough interest in the community I gladly would like to help.
> 
Without wishing in any way to "rain on your parade", a "beefed up
cheeseshop" isn't a new idea. When you say it should be "... simply an
management platform for the app packages" this doesn't solve any
problems at all.

And the "multiplatform client" that should "easily and elegantly allow
app browsing, downloading and installing those apps" would presumably
have to account for the many differences in package formats and install
requirements between the different platforms.

So I don't think you will find too much disagreement that this is an
excellent idea, but neither do I think you fully appreciate the
difficulties this would involve.

There have been many discussions on the python-dev list and the
distutils list about how applications should and/or could be
distributed, but so far little universal agreement on how to achieve
this nirvana of which you conceive.

> Marcel
> 
> 
> PS:
> Naming is important! "Python AppStore" or "Python App Marketplace" is
> nice - but I would prefer something like "Python Bazaar" or "Python
> Souq" to emphasize the community aspect.

Unfortunately I have no idea what a "souq" is, so I suspect this may be
linguistically biased against English speakers. Or perhaps I'm just
ignorant.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From denis.kasak at gmail.com  Sun Feb 22 09:49:25 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Sun, 22 Feb 2009 15:49:25 +0100
Subject: To unicode or not to unicode
In-Reply-To: <gnq6se$n4$1@rumours.uwaterloo.ca>
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
Message-ID: <39e19a010902220649u6d39eb51l9dc164e35ecc222@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:39 AM, Ross Ridge <rridge at csclub.uwaterloo.ca> wrote:
> Ross Ridge (Sat, 21 Feb 2009 18:06:35 -0500)
>> I understand what Unicode and MIME are for and why they exist. Neither
>> their merits nor your insults change the fact that the only current
>> standard governing the content of Usenet posts doesn't require their
>> use.
>
> Thorsten Kampe  <thorsten at thorstenkampe.de> wrote:
>>That's right. As long as you use pure ASCII you can skip this nasty step
>>of informing other people which charset you are using. If you do use non
>>ASCII then you have to do that. That's the way virtually all newsreaders
>>work. It has nothing to do with some 21+ year old RFC. Even your Google
>>Groups "newsreader" does that ('content="text/html; charset=UTF-8"').
>
> No, the original post demonstrates you don't have include MIME headers for
> ISO 8859-1 text to be properly displayed by many newsreaders.  The fact
> that your obscure newsreader didn't display it properly doesn't mean
> that original poster's newsreader is broken.

And how is this kind of assuming better than clearly stating the used
encoding? Does the fact that the last official Usenet RFC doesn't
mandate content-type headers mean that all bets are off and that we
should rely on guesswork to determine the correct encoding of a
message? No, it means the RFC is outdated and no longer suitable for
current needs.

>>Being explicit about your encoding is 99% of the whole Unicode magic in
>>Python and in any communication across the Internet (may it be NNTP,
>>SMTP or HTTP).
>
> HTTP requires the assumption of ISO 8859-1 in the absense of any
> specified encoding.

Which is, of course, completely irrelevant for this discussion. Or are
you saying that this fact should somehow obliterate the need for
specifying encodings?

>>Your Google Groups simply uses heuristics to guess the
>>encoding the OP probably used. Windows newsreaders simply use the locale
>>of the local host. That's guessing. You can call it assuming but it's
>>still guessing. There is no way you can be sure without any declaration.
>
> Newsreaders assuming ISO 8859-1 instead of ASCII doesn't make it a guess.
> It's just a different assumption, nor does making an assumption, ASCII
> or ISO 8850-1, give you any certainty.

Assuming is another way of saying "I don't know, so I'm using this
arbitrary default", which is not that different from a completely wild
guess. :-)

>>And it's unpythonic. Python "assumes" ASCII and if the decodes/encoded
>>text doesn't fit that encoding it refuses to guess.
>
> Which is reasonable given that Python is programming language where it's
> better to have more conservative assumption about encodings so errors
> can be more quickly diagnosed.  A newsreader however is a different
> beast, where it's better to make a less conservative assumption that's
> more likely to display messages correctly to the user.  Assuming ISO
> 8859-1 in the absense of any specified encoding allows the message to be
> correctly displayed if the character set is either ISO 8859-1 or ASCII.
> Doing things the "pythonic" way and assuming ASCII only allows such
> messages to be displayed if ASCII is used.

Reading this paragraph, I've began thinking that we've misunderstood
each other. I agree that assuming ISO 8859-1 in the absence of
specification is a better guess than most (since it's more likely to
display the message correctly). However, not specifying the encoding
of a message is just asking for trouble and assuming anything is just
an attempt of cleaning someone's mess. Unfortunately, it is impossible
to detect the encoding scheme just by heuristics and with hundreds of
encodings in existence today, the only real solution to the problem is
clearly stating your content-type. Since MIME is the most accepted way
of doing this, it should be the preferred way, RFC'ed or not.

-- 
Denis Kasak


From Ron.Barak at lsi.com  Sun Feb 22 09:51:44 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Sun, 22 Feb 2009 14:51:44 +0000
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A1567B.5020407@gmail.com>
References: <49A1567B.5020407@gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>

Hi Stef,

You can do something like (not tested):

try: 
	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
except IndexError,e:
                msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
                print msg
                
Bye,
Ron.
	
> -----Original Message-----
> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
> Sent: Sunday, February 22, 2009 15:43
> To: python-list at python.org
> Subject: can error messages be improved or can they be overridden ?
> 
> hello,
> 
> I often get an error message like this
> 
>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> IndexError: list index out of range
> 
> Now it would be very welcome,
> if the error message specified which index is out of range, 
> in this case e.g.,
> - specifying the length of self.EP
> - specifying the value of self.EP[2]
> - specifying the length of self.Brick.Par etc..
> 
> Is there a way to override the error message and provide this 
> information, or is it impossible ?
> 
> And if it's possible, am I the only one who often stumbles 
> about this problem ?
> (I expect many people must have bounced in this problem before me ;-)
> 
> thanks,
> Stef Mientki
> 
> 
> 

From darcy at druid.net  Sun Feb 22 10:10:19 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 22 Feb 2009 10:10:19 -0500
Subject: datetime.time and midnight
In-Reply-To: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <20090222101019.e53478c8.darcy@druid.net>

On Sun, 22 Feb 2009 05:20:31 -0200
"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
> escribi?:
> > I think it's because midnight is to the time of day what zero is to
> > integers, or an empty string is to strings, or an empty container ...
> 
> So chr(0) should be False too...

>>> chr(0)
'\x00'

That's not an empty string.  This is like...

>>> bool([0])
True

Now if Python had a char type one might expect the zero char to be
False but a collection of anything, even if the elements are False, is
not empty and hence is True.

As someone else said, there's not much point in casting time to boolean
but if you do, it is a base type, not a sequence so I wouldn't expect
to apply sequence logic to the outcome.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From tmohr at s.netic.de  Sun Feb 22 10:13:02 2009
From: tmohr at s.netic.de (Torsten Mohr)
Date: Sun, 22 Feb 2009 16:13:02 +0100
Subject: Reference or Value?
Message-ID: <gnrq68$g9h$1@news.LF.net>

Hi,

how is the rule in Python, if i pass objects to a function, when is this
done by reference and when is it by value?

def f1(a):
    a = 7

b = 3
f1(b)
print b
=> 3

Integers are obviously passed by value, lists and dicts by reference.

Is there a general rule?  Some common formulation?


Thanks for any hints,
Torsten.



From steve at holdenweb.com  Sun Feb 22 10:14:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 22 Feb 2009 10:14:24 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
Message-ID: <gnrq4f$kn3$1@ger.gmane.org>

Barak, Ron wrote:
> Hi Stef,
> 
> You can do something like (not tested):
> 
> try: 
> 	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> except IndexError,e:
>                 msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
>                 print msg
>  
Unfortunately this too can raise an IndexError if self.EP has less than
three elements ...

regards
 Steve

> Bye,
> Ron.
> 	
>> -----Original Message-----
>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>> Sent: Sunday, February 22, 2009 15:43
>> To: python-list at python.org
>> Subject: can error messages be improved or can they be overridden ?
>>
>> hello,
>>
>> I often get an error message like this
>>
>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>> IndexError: list index out of range
>>
>> Now it would be very welcome,
>> if the error message specified which index is out of range, 
>> in this case e.g.,
>> - specifying the length of self.EP
>> - specifying the value of self.EP[2]
>> - specifying the length of self.Brick.Par etc..
>>
>> Is there a way to override the error message and provide this 
>> information, or is it impossible ?
>>
>> And if it's possible, am I the only one who often stumbles 
>> about this problem ?
>> (I expect many people must have bounced in this problem before me ;-)
>>
>> thanks,
>> Stef Mientki
>>
>>
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
> 


-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Sun Feb 22 10:15:14 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 22 Feb 2009 16:15:14 +0100
Subject: "Byte" type?
In-Reply-To: <00d501c994c8$d8eab400$0d00a8c0@hendrik>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<00d501c994c8$d8eab400$0d00a8c0@hendrik>
Message-ID: <gnrq62$lrs$1@ger.gmane.org>

Hendrik van Rooyen wrote:
> "Christian Heimes" <lis....s.de> wrote:
> 
>> John Nagle wrote
>>>    If "bytes", a new keyword, works differently in 2.6 and 3.0, that was
>>> really
>>> dumb.  There's no old code using "bytes".  So converting code to 2.6 means
>>> it has to be converted AGAIN for 3.0.  That's a good reason to ignore
>>> 2.6 as
>>> defective.
>> Please don't call something dumb that you don't fully understand. It's
>> offenses the people who have spent lots of time developing Python --
>> personal, unpaid and voluntary time!
> 
> Crying out;  "Please do not criticise me, I am doing it for free!" does
> not justify delivering sub standard work - that is the nature of the
> open source process - if you lift your head and say or do something,
> there are bound to be some objections - some thoughtful and valid,
> and others merely carping.  Being sensitive about it serves no purpose.

There are proper and polites way to criticize somebody or something --
it's called constructive criticism -- and there are offensive ways. I
hope we can all agree that calling something dumb without good reason is
impolite.

The bytes alias does exactly what it was designed for -- and documented,
too. It just doesn't do what somebody expects it to do. Is this really
sub standard? I don't think so!

Christian



From rzantow at gmail.com  Sun Feb 22 10:21:19 2009
From: rzantow at gmail.com (rzed)
Date: Sun, 22 Feb 2009 15:21:19 +0000
Subject: Scanning a file character by character
References: <a088d6e3-b963-4dc4-9171-ddd02c4a2e5c@w24g2000prd.googlegroups.com>
	<slrngooe42.c1v.grahn+nntp@frailea.sa.invalid>
	<557daab0-504f-47f4-84a7-e98000e7c3b1@y1g2000pra.googlegroups.com>
	<mailman.9119.1234152816.3487.python-list@python.org>
	<203f699b-de30-422a-aa7d-97eb62d6ebba@a12g2000pro.googlegroups.com>
	<pan.2009.02.10.03.49.04@REMOVE.THIS.cybersource.com.au>
	<Xns9BAE798A293F9duncanbooth@127.0.0.1>
	<c86cd530-cee5-4de6-8e19-304c664c9ca0@c12g2000yqj.googlegroups.com>
Message-ID: <Xns9BBA69570B77Drzantowgmailcom@74.209.131.13>

Spacebar265 <spacebar265 at gmail.com> wrote in
news:c86cd530-cee5-4de6-8e19-304c664c9ca0 at c12g2000yqj.googlegroups.c
om: 

> On Feb 11, 1:06?am, Duncan Booth <duncan.bo... at invalid.invalid>
> wrote: 
[...]
>> >>> re.split("(\w+)", "The quick brown fox jumps, and falls
>> >>> over.")[1::2] 
>>
>> ['The', 'quick', 'brown', 'fox', 'jumps', 'and', 'falls',
>> 'over'] 
> 
> Using this code how would it load each word into a temporary
> variable. 

>>> import re
>>> list_name = re.split("(\w+)", "The quick brown fox jumps, and 
falls over.")[1::2]
>>> list_name[2]
'brown'

You see, temporary variables are set. Their names are spelled 
'list_name[x]', where x is an index into the list. If your plan was 
instead to have predefined names of variables, what would they be 
called? How many would you have? With list variables, you will have 
enough, and you will know their names.

-- 
rzed


From lists at cheimes.de  Sun Feb 22 10:23:58 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 22 Feb 2009 16:23:58 +0100
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <gnrqme$mmv$1@ger.gmane.org>

Torsten Mohr schrieb:
> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
> => 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?

Python uses neither call by reference nor call by value. It's called
call by sharing or call by object. http://effbot.org/zone/call-by-object.htm

Christian



From Samnsparky at gmail.com  Sun Feb 22 10:46:30 2009
From: Samnsparky at gmail.com (Sparky)
Date: Sun, 22 Feb 2009 07:46:30 -0800 (PST)
Subject: Windows Install Command Line
Message-ID: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>

For internal distribution purposes, I was wondering if there was an
already established process/program for installing Python on Windows
machines without using an msi file or compiling from source. Basically
I need the standard distribution installed by either a batch file or
python script through py2exe.

Thank you in advance,
Sam


From duncan.booth at invalid.invalid  Sun Feb 22 10:47:16 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 22 Feb 2009 15:47:16 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <Xns9BBAA092CF55Eduncanbooth@127.0.0.1>

Torsten Mohr <tmohr at s.netic.de> wrote:

> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
>=> 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?

Yes, integers are 'obviously' passed by value, except that if they were you 
couldn't do this:

>>> x = 26*1000
>>> y = 26000
>>> id(x)==id(y)
False
>>> def whichint(arg):
	if id(arg)==id(x):
		print "You passed x"
	elif id(arg)==id(y):
		print "You passed y"

		
>>> whichint(x)
You passed x
>>> whichint(y)
You passed y


The general rule is that everything is passed in exactly the same way.


From google at mrabarnett.plus.com  Sun Feb 22 10:53:59 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 22 Feb 2009 15:53:59 +0000
Subject: datetime.time and midnight
In-Reply-To: <op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
References: <49A083DA.7000107@stoneleaf.us>	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A17517.5010307@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com> 
> escribi?:
> 
>> Ethan Furman wrote:
>>> Greetings, List!
>>>  I was curious if anyone knew the rationale behind making midnight 
>>> False?
>>>  --> import datetime
>>> --> midnight = datetime.time(0,0,0)
>>> --> bool(midnight)
>>> False
>>>  To my way of thinking, midnight does actually exist so it should be 
>>> true.  If datetime.time was measuring an *amount* of time, rather 
>>> than a certain point during the day, then a time of 0:0:0 should 
>>> certainly be False as it would mean no time had passed.  However, 
>>> since midnight does indeed exist (as many programmers have observed 
>>> when deadlines approach ;) I would think it should be true.
>>>
>> I think it's because midnight is to the time of day what zero is to
>> integers, or an empty string is to strings, or an empty container ...
> 
> So chr(0) should be False too...
> 
If that returned a character, then yes, but it returns a non-empty
string, so no. :-)


From google at mrabarnett.plus.com  Sun Feb 22 11:09:26 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 22 Feb 2009 16:09:26 +0000
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <49A178B6.1040701@mrabarnett.plus.com>

Torsten Mohr wrote:
> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
> => 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?
> 
They are all passed the same way:

def f2(a):
     a = [7]

b = [3]
f2(b)
print b
=> [3]

It's just that lists and dicts are containers whose contents you can
change (they are mutable), but integers aren't containers (they are
immutable).

Tuples are also containers, but you can't change their contents (they
are immutable).


From andrew at acooke.org  Sun Feb 22 11:37:27 2009
From: andrew at acooke.org (andrew cooke)
Date: Sun, 22 Feb 2009 13:37:27 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <gnrq68$g9h$1@news.LF.net>
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <5b1b0ac71a7fe5a4e89092b0e8ec7c78.squirrel@acooke.dyndns.org>


as far as i understand things, the best model is:

1 - everything is an object
2 - everything is passed by reference
3 - some objects are immutable
4 - some (immutable?) objects are cached/reused by the system

andrew


Torsten Mohr wrote:
> Hi,
>
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
>
> def f1(a):
>     a = 7
>
> b = 3
> f1(b)
> print b
> => 3
>
> Integers are obviously passed by value, lists and dicts by reference.
>
> Is there a general rule?  Some common formulation?
>
>
> Thanks for any hints,
> Torsten.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From deets at nospam.web.de  Sun Feb 22 11:52:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Sun, 22 Feb 2009 17:52:16 +0100
Subject: Musings: Using decorators to reduce duplicate exception handling
In-Reply-To: <878wo4verq.fsf@agentultra.com>
References: <878wo4verq.fsf@agentultra.com>
Message-ID: <70de61Fp2e8U1@mid.uni-berlin.de>

J Kenneth King schrieb:
> I recently started a project called TracShell
> (http://code.google.com/p/tracshell) where I make heavy use of the
> xmlrpclib core module.
> 
> When the number of RPC calls was small, wrapping each call in try/except
> was acceptable. However, this obviously will duplicate code all over the
> place. There are only ever two exceptions that the module itself will
> throw: xmlrpclib.ProtocolError and xmlrpclib.Fault -- both very useful,
> but not show stoppers.

I think the answer depends a lot on the actual error handling performed. 
If you want retries, either immediately, or with some larger prologue, 
it might make sense to abstract that away (I would have suggested the 
context-manager thing myself, but Cameron did that already).

But if you essentially want to abort in all cases, I'd just push the 
handling upwards, and rather improve the error reporting itself, e.g. by 
storing away the trace in a temporary file the user can send you.

Diez


From grante at visi.com  Sun Feb 22 11:57:17 2009
From: grante at visi.com (Grant Edwards)
Date: Sun, 22 Feb 2009 10:57:17 -0600
Subject: Unexpected long pyserial read delay on Windows
References: <49a17e2d$0$1678$742ec2ed@news.sonic.net>
Message-ID: <5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>

On 2009-02-22, John Nagle <nagle at animats.com> wrote:

> I've been using PySerial on Windows (Win2000, amusingly) to
> drive a Baudot teletype at 45.45 baud.  Input and output work,
> but there's a delay of about 1 second (!) on the input side
> between receiving a character and reporting it to the program.

The UART you're using almost certainly has a receive FIFO.
Normally, the UART doesn't interrupt the CPU to tell it there's
receeve data ready until the FIFO is almost full (eg 12 bytes
present in a 16 byte FIFO).

If the UART has an empty receive FIFO, and it receives a single
character that character goes into the receive FIFO.  If data
stops coming in before the rx FIFO threshold is reached, the
UART will wait 40 bit-times and then interrupt the CPU to tell
it there is receive data ready.

The thought is that maybe there's more data coming -- we don't
want to waste the CPU's time handling a single byte if there's
more data coming in.

At 45.45 baud, 40 bit-times is pretty close to 1 second.

If you don't want to wait 40-bit times for the rx data timeout,
then you need to disable the rx FIFO.  I'm not sure how you do
that in Windows.  I don't remember seeing anything in pyserial
to do it, but I avoid Windows as much as possible.  You might
want to go looking around in the device manager to see if
there's a checkbox "disalbe FIFO" in the serial port driver
config.

If not, then Google can probably help.

-- 
Grant



From nagle at animats.com  Sun Feb 22 12:05:20 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 22 Feb 2009 09:05:20 -0800
Subject: Unexpected long pyserial read delay on Windows
Message-ID: <49a17e2d$0$1678$742ec2ed@news.sonic.net>

    I've been using PySerial on Windows (Win2000, amusingly) to drive
a Baudot teletype at 45.45 baud.  Input and output work, but there's
a delay of about 1 second (!) on the input side between receiving a
character and reporting it to the program.

    I'm using the latest "supports 1.5 stop bits" version of PySerial
(as noted previously, this is necessary for the old mechanical Teletypes),
and opening as follows:

	ser = serial.Serial(port, baudrate=baud,
			bytesize=serial.FIVEBITS,
			parity=serial.PARITY_NONE,
			stopbits=serial.STOPBITS_ONE5,
			timeout=None)

I've tried omitting the timeout parameter, "timeout=0", and "timeout=0.1",
none of which seem to change the behavior.  The code doing the
reading is simply

while True :
     s = ser.read()				# get some input
     for ch in s:
	ser.write(ch)				# write to tty

This correctly types back what's typed in, but with a delay of about 10
character times, over 1 second. (Remember, this is a VERY slow serial
device.) There's nothing else running; CPU load is under 1%.

I've tried "ser.read(1)"; makes no difference.

The delay is on the read side; if I put in a "print", the delay occurs
before the computer prints the received character.

Is this some Windows thing?  I've looked at serialwin32.py around line 88,
and don't see any nonzero timeout parameters being fed to Windows
when "timeout=None".  Checking the Microsoft documentation, at

http://msdn.microsoft.com/en-us/library/aa363190(VS.85).aspx

feeding all zeroes into the COMMTIMEOUT structure should result in no
additional delays.

				John Nagle

	


From digitig at gmail.com  Sun Feb 22 12:09:29 2009
From: digitig at gmail.com (Tim Rowe)
Date: Sun, 22 Feb 2009 17:09:29 +0000
Subject: datetime.time and midnight
In-Reply-To: <0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
References: <mailman.427.1235256686.11746.python-list@python.org>
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
Message-ID: <aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>

2009/2/22 Mark Dickinson <dickinsm at gmail.com>:
> On Feb 21, 10:44 pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
>> --> midnight = datetime.time(0,0,0)
>> --> bool(midnight)
>> False
>
> I'd call this a bug.

No more so than zero being false. Zero exists too (check my bank
balance). Once you've accepted non-Boolean types having Boolean
values, the logic of what value they have is always going to be a bit
hairy. If you're unsure of the logic, just test against a value or a
range. After all, what value do you *expect* a time of day to have
when interpreted as a Boolean? If you don't have an expectation, why
are you interpreting it as a Boolean?


-- 
Tim Rowe


From marcel.luethi at mlsystems.ch  Sun Feb 22 12:17:23 2009
From: marcel.luethi at mlsystems.ch (Marcel Luethi)
Date: Sun, 22 Feb 2009 18:17:23 +0100
Subject: Python AppStore / Marketplace
In-Reply-To: <gnrn0o$4ju$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org>
Message-ID: <46ed0da80902220917r6bb696a6u68d67f9f8674aa28@mail.gmail.com>

Hi Steve

I really appreciate your feedback!
Certainly I'm no expert "for the many differences in package formats and
install requirements between the different platforms".

But let me explain a bit more:
I don't have the idea that the multi-platform client should handle all the
different package formats - instead it should define a new one: a simple
zip-file.
For me "self-contained, independent of an already installed Python" means
that there is a complete, isolated Python environment for each app (see
virtualenv). So Python would go into APP/lib/..., APP/bin/... and the app
itself into APP/app/... Certainly there would be also some more files like
the app icons and a description file APP/app.xml
The packaged app is a zip/gzip of the whole APP directory. Installing is
simply unpacking to a defined directory (into something like PythonApps/APP)
and setting it up as an os app.

Because there is a complete Python environment for each app (disk space and
bandwidth are cheap nowadays!) and all 3rd party libs are "integrated" there
shouldn't be any other local dependencies. So there could be APP1 with a
Python 2.5.2 + a wxPython/wxWidgets and another APP2 with Python 2.6.1 +
PyQt4.
(This is something I'm not really sure about: is it possible to setup all
binary 3rd party libs ?*.so/*.pyo/*.dll/*.pyd/...? into an isolated Python
environment?)
Of course there can't be a single APP1 for all possible platforms. But there
could be one setup for each: APP1_Linux, APP1_MacOsX10.5, APP1_WinXP
The developer has to setup/test every supported platform anyway.

The "bootstrap" (standing on the shoulders of giants) could work like this:
- first there is a base app "Python 2.5.1 for Mac OS X 10.5" built by
developer A
- next developer B creates "Django 1.0.2 for Mac OS X 10.5" based on the one
above
- then developer C integrates Pinax into B's app and creates "Pinax 0.5.1
for Mac OS X 10.5"

All those "apps" could be found in Python AppStore and a developer could
search for the one which matches his requirements best. His implementation
cost is therefore minimized.

A iTunes-like client would allow the end-user to find apps - assumed that
all (or most) developers upload their apps into the one and only Python
AppStore.
The client (there should be one for every supported platform) is a front-end
application for the (PSF-) hosted "super-cheeseshop", which end-users are
not expected to access directly.


Is my nirvana really that far away? ;-)

Best regards,
Marcel


PS
A "Souq" is an Arab market (similar to a bazaar):
http://en.wikipedia.org/wiki/Souq
I got to know one visiting one last year in Oman - and I really liked it.
But now I can see that soundex('souq') == soundex('suck').
You're right, this would be a very bad choice... ;-)




On Sun, Feb 22, 2009 at 3:21 PM, Steve Holden <steve at holdenweb.com> wrote:

> Marcel Luethi wrote:
> > Dear Community
> >
> > Now I'm standing here, having this great idea for a brand new rocking
> > app...
> > But where do I start? I want it to be multi-platform (Linux, Mac OS X,
> > Windows). It should be easy to install and upgrade. It should be self-
> > contained, independent of an already installed Python. And of course -
> > the world should be able to find it!
> >
> > So what do I do? I'm studying all the possibilities to make it self-
> > contained (virtualenv, InstantDjango, PortablePython...), searching
> > for installers (PyInstaller, EasyInstall, ...), looking into making it
> > executable on every platform (py2exe, py2app, cx_Freeze, ...),
> > analyzing all GUI frameworks (wxPython, PyGTK, PyQt, ...),
> > investigating all hosting providers (Google Code, SourceForge, ...)
> > and so on and so forth.
> >
> > This is not easy at all!
> >
> > Using my iPhone I suddenly realize how easy it is to find applications
> > in Apple's AppStore. How easy and fast it is to install or de-install
> > an app. My iPhone even checks in the background if there is an upgrade
> > which could be installed painlessly.
> >
> > Then I see VMware's Virtual Appliance Marketplace, where you can
> > download already pre-configured "appliances" for all kind of stuff.
> > You can even download a basic appliance, install and configure your
> > servers and tools - and upload it again, so that others can profit of
> > your work.
> >
> > Unfortunately there's nothing like this in the Python world...
> >
> > My idea: what about having a beefed up Cheeseshop for Python apps and
> > an accompanying client app kind of iTunes for Python apps?
> >
> > The server side could be easily implemented with any of the current
> > web frameworks. It's simply a management platform for the app packages
> > (descriptions, versions, platforms, licenses, user's comments, number
> > of downloads, ...) and the package files themselves.
> > It should be definitely hosted by the PSF I think.
> >
> > The multi-platform client should be intuitively and elegantly allow
> > app browsing, downloading and installing those Python apps. In that
> > respect it is sort of a Linux package manager (Synaptic, YUM, ...).
> > But this is only the end-user related stuff. Furthermore it should
> > allow to create new apps (probably based on a previously downloaded
> > base app), package and upload them again (kind of Google AppEngine
> > Launcher). Those base packages should include some basic management
> > framework (for installation and configuration) and hopefully soon
> > after the release of this platform they will be created in a broad
> > variety to allow app developers to choose among many Python-version/
> > platform/GUI/...-combinations.
> >
> > IMHO an architecture like this would greatly enhance the productivity
> > of the whole Python community by capitalizing the knowledge of many
> > Python specialists. I don't have to find/install/configure all the
> > basic stuff myself (see above) to build my app. But I can concentrate
> > on my app because I'm standing on the shoulders of giants.
> >
> > I believe it also would make Python as a great platform more visible
> > to the world - because there is only one place you have to go...
> >
> >
> > What do you think???
> > Is this crazy??? Or simply stupid?
> > Or is this the way to world domination...? ;-)
> >
> >
> > Unfortunately I'm not expert enough to build such a system - but if
> > there is enough interest in the community I gladly would like to help.
> >
> Without wishing in any way to "rain on your parade", a "beefed up
> cheeseshop" isn't a new idea. When you say it should be "... simply an
> management platform for the app packages" this doesn't solve any
> problems at all.
>
> And the "multiplatform client" that should "easily and elegantly allow
> app browsing, downloading and installing those apps" would presumably
> have to account for the many differences in package formats and install
> requirements between the different platforms.
>
> So I don't think you will find too much disagreement that this is an
> excellent idea, but neither do I think you fully appreciate the
> difficulties this would involve.
>
> There have been many discussions on the python-dev list and the
> distutils list about how applications should and/or could be
> distributed, but so far little universal agreement on how to achieve
> this nirvana of which you conceive.
>
> > Marcel
> >
> >
> > PS:
> > Naming is important! "Python AppStore" or "Python App Marketplace" is
> > nice - but I would prefer something like "Python Bazaar" or "Python
> > Souq" to emphasize the community aspect.
>
> Unfortunately I have no idea what a "souq" is, so I suspect this may be
> linguistically biased against English speakers. Or perhaps I'm just
> ignorant.
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
********************************************
MLSystems GmbH
Marcel L?thi
El.-Ing. HTL, Inf.-Ing. HTL/NDS, CNE, CNS
Betriebswirtschafts-Ing. HTL/NDS
Schwarzbachstrasse 22a
CH-3113 Rubigen / Switzerland

Tel. +41 (31) 721 83 25
Mob. +41 (79) 709 66 58
marcel.luethi at mlsystems.ch
********************************************
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From hniksic at xemacs.org  Sun Feb 22 12:44:04 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Sun, 22 Feb 2009 18:44:04 +0100
Subject: "metaclass conflict" error: where is noconflict ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com> (Ron
	Barak's message of "Sun\, 22 Feb 2009 13\:41\:20 +0000")
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<mailman.444.1235302275.11746.python-list@python.org>
	<87k57iu16j.fsf@mulj.homelinux.net>
	<7F0503CD69378F49BE0DC30661C6CCF62783D688@enbmail01.lsi.com>
Message-ID: <8763j2tli3.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> import wx
>
> class CopyAndPaste(object):
>  def __init__(self):
>   pass
>
>  def set_copy_and_paste(self):
>  ...
>
> and CopyAndPaste is being called with:
>
> ...
> class ListControlMeta(wx.Frame, CopyAndPaste):
>  pass

You don't need ListControlMeta at all; just inherit from wx.Frame and
(new-style) CopyAndPaste directly.

> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 324, in <module>
>  class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>  metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases

Are you sure you're executing the latest version where CopyAndPaste is
a new-style class?  The equivalent code works for me:

>>> import wx
>>> class CopyAndPaste(object):
...   pass
...
>>> class ListControl(wx.Frame, CopyAndPaste):
...   pass
...
>>> # no error

Could it be that you're using an older version of wx, where wx.Frame
itself is an old-style class?


From martin at v.loewis.de  Sun Feb 22 13:15:32 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 19:15:32 +0100
Subject: Windows Install Command Line
In-Reply-To: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
References: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
Message-ID: <49a19644$0$27378$9b622d9e@news.freenet.de>

Sparky wrote:
> For internal distribution purposes, I was wondering if there was an
> already established process/program for installing Python on Windows
> machines without using an msi file or compiling from source. Basically
> I need the standard distribution installed by either a batch file or
> python script through py2exe.

What's wrong with running the MSI from a batch file?

msiexec /i pythonxy.msi

If you want installation to be silent, add more command line options
to msiexec.

HTH,
Martin


From martin at v.loewis.de  Sun Feb 22 13:38:10 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 19:38:10 +0100
Subject: "Byte" type?
In-Reply-To: <mailman.439.1235292478.11746.python-list@python.org>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
Message-ID: <49A19B92.2080102@v.loewis.de>

>> Please don't call something dumb that you don't fully understand. It's
>> offenses the people who have spent lots of time developing Python --
>> personal, unpaid and voluntary time!
> 
> Crying out;  "Please do not criticise me, I am doing it for free!" does
> not justify delivering sub standard work - that is the nature of the
> open source process - if you lift your head and say or do something,
> there are bound to be some objections - some thoughtful and valid,
> and others merely carping.  Being sensitive about it serves no purpose.

Still, John *clearly* doesn't understand what he observes, so asking him
not to draw conclusions until he does understand is not defending
against criticism.

> This is not a helpful response - on the surface JN has a point - If
> you have to go through two conversions, then 2.6 does not achieve
> what it appears to set out to do.  So the issue is simple:
> 
> - do you have to convert twice?

Depends on how you write your code. If you use the bytearray type
(which John didn't, despite his apparent believe that he did),
then no conversion additional conversion is needed.

Likewise, if you only use byte (not bytearray) literals, without
accessing individual bytes (e.g. if you only ever read and write
them, or pass them to the struct module), 2to3 will do the right
thing.

> - If yes - why? - as he says - there exists no prior code,
>   so there seems to be no reason not to make it identical
>   to 3.0

Sure there is. Making the bytes type and the str type identical
in 2.x gives the easiest way of porting. Adding bytes as a separate
type would have complicated a lot of things.

Regards,
Martin


From nagle at animats.com  Sun Feb 22 13:38:11 2009
From: nagle at animats.com (John Nagle)
Date: Sun, 22 Feb 2009 10:38:11 -0800
Subject: Unexpected long pyserial read delay on Windows
In-Reply-To: <5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>
References: <49a17e2d$0$1678$742ec2ed@news.sonic.net>
	<5LidnW-lq61wHjzUnZ2dnUVZ_jqWnZ2d@posted.usinternet>
Message-ID: <49a193c7$0$1581$742ec2ed@news.sonic.net>

Grant Edwards wrote:
> On 2009-02-22, John Nagle <nagle at animats.com> wrote:
> 
>> I've been using PySerial on Windows (Win2000, amusingly) to
>> drive a Baudot teletype at 45.45 baud.  Input and output work,
>> but there's a delay of about 1 second (!) on the input side
>> between receiving a character and reporting it to the program.
> 
> The UART you're using almost certainly has a receive FIFO.
> Normally, the UART doesn't interrupt the CPU to tell it there's
> receeve data ready until the FIFO is almost full (eg 12 bytes
> present in a 16 byte FIFO).
> 
> If the UART has an empty receive FIFO, and it receives a single
> character that character goes into the receive FIFO.  If data
> stops coming in before the rx FIFO threshold is reached, the
> UART will wait 40 bit-times...

    Ah, 40 bit times.  That's the default.  And that's the problem.
I thought the accumulation timer was a fixed timer of a few milliseconds.

    There is a "disable FIFO" checkbox in Windows 2000. It's hard to
find.

	- Log off as user.
	- Log on as "administrator"
	- Open Control Panel -> System
	- Go to "Devices" tab and select "Device manager".
	- Open "Ports" in the tree and click on desired COM1 port.
	- Click "Advanced" button.
	- Set "Receive buffer size" slider to 1.
	- Click "Disable FIFO" checkbox.
	- Close all the dialogs.
	- Reboot. (Yes, it doesn't take effect until the next reboot.)

That fixed the problem.  Thanks.

					John Nagle


From ark at acm.org  Sun Feb 22 13:39:01 2009
From: ark at acm.org (Andrew Koenig)
Date: Sun, 22 Feb 2009 18:39:01 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
Message-ID: <9Zgol.34884$4m1.18711@bgtnsc05-news.ops.worldnet.att.net>

"andrew cooke" <andrew at acooke.org> wrote in message 
news:mailman.464.1235320654.11746.python-list at python.org...

> as far as i understand things, the best model is:
>
> 1 - everything is an object
> 2 - everything is passed by reference
> 3 - some objects are immutable
> 4 - some (immutable?) objects are cached/reused by the system

0 - Assignment rebinds the reference on its left-hand side; it does not 
change the object to which that reference refers.

Example:

    x = 42
    y = x

Now x and y are bound to the same object

    x = x + 1

This statement computes the value of x + 1, which is a new object with value 
43.  It then rebinds x to refer to this object, so x and y now refer to 
different objects.  Therefore:

    def f(a):
        a = a + 1
    x = 42
    f(x)

This example behaves analogously to the previous one: The assignment a = a + 
1 binds a to a new object, so it does not affect the object to which x is 
bound.

    z = [3]
    y = z
    z[0] = z[0] + 1

The assignment rebinds z[0] to refer to a new object that has the value 4. 
This rebinding does not affect the object formerly bound to z[0].  It does, 
however, affect the value of the object to which z is bound, because it 
changes the value of its list element.  By analogy:

    def g(b):
        b[0] = b[0] + 1
    w = [42]
    g(w)

Now w[0] will be 43.




From stefan_ml at behnel.de  Sun Feb 22 14:21:51 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 22 Feb 2009 20:21:51 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<499fdbae$0$31865$9b4e6d93@newsspool3.arcor-online.net>
	<006db7aa-76c6-4bf4-bf2a-e180f1665e5e@g38g2000yqd.googlegroups.com>
Message-ID: <49a1a5d0$0$31340$9b4e6d93@newsspool4.arcor-online.net>

intelliminer at gmail.com wrote:
> Ummm, I didn't know about the dbm databases. It seems there are many
> different
> modules for this kind of tasks: gdbm, berkeley db, cdb, etc. I'm
> needing to implement
> a constant hashtable with a large number of keys, but only a small
> fraction of them
> will be accessed frequently, the read speed is crucial. It would be
> ideal if
> the implementation caches all the frequently used key/value pairs in
> memory. Which
> module should I use? And is there a way to specify the amount of
> memory it uses for caching?
> BTW, the target platform is Linux.

Their interfaces are mostly compatible to Python dicts. Just keep your code
independent at the beginning and benchmark it against all of them.

Stefan


From ra.ravi.rav at gmail.com  Sun Feb 22 14:44:50 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Sun, 22 Feb 2009 11:44:50 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
Message-ID: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>

The following code didn't work:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)


However the following did:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, **kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)



Please explain


From tim.wintle at teamrubber.com  Sun Feb 22 14:52:13 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Sun, 22 Feb 2009 19:52:13 +0000
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <1235332334.32144.4.camel@tim-laptop>

On Sun, 2009-02-22 at 11:44 -0800, Ravi wrote:
> The following code didn't work:
> 
<snip>
>         def g(self, s, kwds):
>                 print s
>                 print kwds

This expects the function g to be called with the parameters "s" and
"kwds"

<snip>
>         def g(self, s, **kwds):
>                 print s
>                 print kwds

This expects to be passed the parameter "s", and various keyword
arguments, which will be put into the dict "kwds".

when you call 

o.g("string",**kwds)

you are passing the parameter "string" as the first parameter, and then
a sequence of keyword arguments taken from kwds, which will be passed
separately.

This is what the second form expects, but not what the first one
expects.

Tim Wintle




From ra.ravi.rav at gmail.com  Sun Feb 22 15:09:26 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Sun, 22 Feb 2009 12:09:26 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.468.1235332348.11746.python-list@python.org>
Message-ID: <2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>

I am sorry about the typo mistake, well the code snippets are as:

# Non Working:

class X(object):
  def f(self, **kwds):
  print kwds
  try:
    print kwds['i'] * 2
  except KeyError:
    print "unknown keyword argument"
    self.g("string", kwds)

  def g(self, s, **kwds):
    print s
    print kwds

if __name__ == "__main__":
x = X()
x.f(k = 2, j = 10)


# Working One

class X(object):
  def f(self, **kwds):
    print kwds
    try:
      print kwds['i'] * 2
    except KeyError:
     print "unknown keyword argument"
   self.g("string", **kwds)

def g(self, s, **kwds):
  print s
  print kwds

if __name__ == "__main__":
x = X()
x.f(k = 2, j = 10)


From marduk at letterboxes.org  Sun Feb 22 15:09:38 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 15:09:38 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <1235333378.17589.6.camel@centar.nbk>

On Sun, 2009-02-22 at 11:44 -0800, Ravi wrote:
> The following code didn't work:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
                                   ^^^^^^

This means call g() with kwds passed as keyword arguments.

>         def g(self, s, kwds):

The method signature is not expecting keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
> 
> However the following did:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
> 
>         def g(self, s, **kwds):
                         ^^^^^^
The method signature expects (optionally) keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
> 




From Samnsparky at gmail.com  Sun Feb 22 15:10:59 2009
From: Samnsparky at gmail.com (Sparky)
Date: Sun, 22 Feb 2009 12:10:59 -0800 (PST)
Subject: Windows Install Command Line
References: <79f5a45d-e603-41f1-8858-1206fb95f1fd@b16g2000yqb.googlegroups.com>
	<49a19644$0$27378$9b622d9e@news.freenet.de>
Message-ID: <5e645c6d-8707-4f6b-abd1-798e3802df32@u38g2000yqe.googlegroups.com>

On Feb 22, 11:15?am, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> Sparky wrote:
> > For internal distribution purposes, I was wondering if there was an
> > already established process/program for installing Python on Windows
> > machines without using an msi file or compiling from source. Basically
> > I need the standard distribution installed by either a batch file or
> > python script through py2exe.
>
> What's wrong with running the MSI from a batch file?
>
> msiexec /i pythonxy.msi
>
> If you want installation to be silent, add more command line options
> to msiexec.
>
> HTH,
> Martin

Ah! Wonderful that was exactly what I was looking for.

Thanks,
Sam


From martin at v.loewis.de  Sun Feb 22 15:11:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Sun, 22 Feb 2009 21:11:41 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
Message-ID: <49a1b17d$0$28748$9b622d9e@news.freenet.de>

intelliminer at gmail.com wrote:
> Is there a limit to the size or number of entries that a single 
> dictionary can possess?

On a 32-bit system, the dictionary can have up to 2**31 slots,
meaning that the maximum number of keys is slightly smaller
(about 2**30).

As others have pointed out, Python's or Windows' memory management
might have led to fragmentation, so that no contiguous piece of
memory to hold the resized dictionary can be found.

One solution to that problem would be to use a 64-bit system.

Regards,
Martin



From clp2 at rebertia.com  Sun Feb 22 15:11:59 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 12:11:59 -0800
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
Message-ID: <50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>

On Sun, Feb 22, 2009 at 5:14 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Chris,
<snip
> Is there a way to ask a class what its metaclasses are ?
> (e.g., how to ask wx.Frame what it's metaclass is)

Of course. A metaclass is the type of a class, so it's just type(wx.Frame).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com

>
> I'm asking, because, even subclassing from object, viz.:
>
> class CopyAndPaste(object):
>     def __init__(self):
>         pass
> ...
>
> Still gives me:
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 321, in <module>
>     class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
>
> Bye,
> Ron.


From marduk at letterboxes.org  Sun Feb 22 15:32:23 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 15:32:23 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.468.1235332348.11746.python-list@python.org>
	<2d5cbec9-49ac-4180-bb49-6f518ac3fcad@n21g2000vba.googlegroups.com>
Message-ID: <1235334743.17589.15.camel@centar.nbk>

On Sun, 2009-02-22 at 12:09 -0800, Ravi wrote:
> I am sorry about the typo mistake, well the code snippets are as:
> 
> # Non Working:
> 
> class X(object):
>   def f(self, **kwds):
>   print kwds
>   try:
>     print kwds['i'] * 2
>   except KeyError:
>     print "unknown keyword argument"
>     self.g("string", kwds)
> 
>   def g(self, s, **kwds):
>     print s
>     print kwds
> 
> if __name__ == "__main__":
> x = X()
> x.f(k = 2, j = 10)
> 
> 
> # Working One
> 
> class X(object):
>   def f(self, **kwds):
>     print kwds
>     try:
>       print kwds['i'] * 2
>     except KeyError:
>      print "unknown keyword argument"
>    self.g("string", **kwds)
> 
> def g(self, s, **kwds):
>   print s
>   print kwds
> 
> if __name__ == "__main__":
> x = X()
> x.f(k = 2, j = 10)

Same reasoning, though admittedly the error text is misleading.

This example can be simplified as:

def foo(x, **kwargs):
    pass

>>> foo(1, {'boys': 5, 'girls': 10}) 
==> TypeError: foo() takes exactly 1 argument (2 given)

Again misleading, but the argument is the same (no pun intended).

However the following would have worked:

>>> foo(1, **{'boys': 5, 'girls': 10})

or 

>>> foo(1, boys=5, girls=10)



From desas2 at gmail.com  Sun Feb 22 16:03:03 2009
From: desas2 at gmail.com (desas2 at gmail.com)
Date: Sun, 22 Feb 2009 13:03:03 -0800 (PST)
Subject: Problem with lists.
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <172d73c1-58e3-443b-81e7-15052092308e@f3g2000yqf.googlegroups.com>

On Feb 20, 10:12?am, "ssd" <c... at d.com> wrote:
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values ?b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
> ? ? for j in range (0,5):
> ? ? ? ? a[0] = i
> ? ? ? ? a[1] = j
> ? ? ? ? print "a: " + str(a)
> ? ? ? ? b.append(a)
>
> print "b: " + str(b)
>
> what is worng in the code?
>
> Thanks,
> Bye,

This is what I did and gives your expected results. I am sure, there
may be better way of doing it.
a = []
b =[]
for i in range(0,5):
    for j in range(0,5):
        a.append(i)
        a.append(j)
        b.append(a)
        a =[]
print b

output:
[[0, 0], [0, 1], [0, 2], [0, 3], [0, 4], [1, 0], [1, 1], [1, 2], [1,
3], [1, 4],
 [2, 0], [2, 1], [2, 2], [2, 3], [2, 4], [3, 0], [3, 1], [3, 2], [3,
3], [3, 4],
 [4, 0], [4, 1], [4, 2], [4, 3], [4, 4]]

HTH
Dinakar


From rozzin at geekspace.com  Sun Feb 22 16:06:35 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 16:06:35 -0500
Subject: datetime.time and midnight
References: <49A083DA.7000107@stoneleaf.us>
	<49A0946B.8040206@mrabarnett.plus.com>
	<op.upqr0hkax6zn5v@gabriel.sleipnir-bsas>
	<mailman.457.1235315429.11746.python-list@python.org>
Message-ID: <8763j2qizo.fsf@slice.rozzin.com>

"D'Arcy J.M. Cain" <darcy at druid.net> writes:
>
> On Sun, 22 Feb 2009 05:20:31 -0200
> "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> wrote:
> > En Sat, 21 Feb 2009 21:55:23 -0200, MRAB <google at mrabarnett.plus.com>  
> > escribi?:
> > > I think it's because midnight is to the time of day what zero is to
> > > integers, or an empty string is to strings, or an empty container ...
> > 
> > So chr(0) should be False too...
> 
> >>> chr(0)
> '\x00'
> 
> That's not an empty string.  This is like...
> 
> >>> bool([0])
> True
> 
> Now if Python had a char type one might expect the zero char to be
> False but a collection of anything, even if the elements are False, is
> not empty and hence is True.

And, as Halmos said:

   A box that contains a hat and nothing else is not the same thing as
   a hat....

:)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From clp2 at rebertia.com  Sun Feb 22 16:11:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 13:11:55 -0800
Subject: Problem with lists.
In-Reply-To: <gnsdo4$mvc$2@aioe.org>
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <50697b2c0902221311s3eca7d6y396c6abb3f959879@mail.gmail.com>

On Fri, Feb 20, 2009 at 8:12 AM, ssd <cdsd at d.com> wrote:
>
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values  b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
>    for j in range (0,5):
>        a[0] = i
>        a[1] = j
>        print "a: " + str(a)
>        b.append(a)

.append() does NOT copy the list `a`, it appends a /reference/ to `a`
(so to speak); thus, when you change `a` on the next iteration, you
change the same list *all* the entries in `b` point to.

Here's a corrected version:

b =[]
for i in range(0,5):
    for j in range(0,5):
        a = [i, j]
        b.append(a)
print b

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tjreedy at udel.edu  Sun Feb 22 16:18:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:18:39 -0500
Subject: Python 3 and easygui problem
In-Reply-To: <49A13F8C.1000506@internode.on.net>
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
	<49A13F8C.1000506@internode.on.net>
Message-ID: <gnsffd$ne6$1@ger.gmane.org>

Peter Anderson wrote:
> Gabriel Genellina said:
> 
> That's very short-lived; cmp is gone in 3.0.1 (should not have existed 
> in 3.0 in the first place).
> Try with:
> choices.sort(key=str.lower)
> 
> 
> Gabriel,
> 
> That's worked fine - thank you. I think I now have a version of 
> easygui.py that works with Python 3, probably needs a bit more testing.

Can you please make it available thru PyPI?



From tjreedy at udel.edu  Sun Feb 22 16:20:13 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:20:13 -0500
Subject: Python 3 and easygui problem
In-Reply-To: <50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
Message-ID: <gnsfic$ne6$2@ger.gmane.org>

Chris Rebert wrote:
> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
> <peter.anderson at internode.on.net> wrote:
>> I have just installed Python 3. I have been using Tkinter and easygui (with
>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>> existing scripts to Python 3 and discovered problems with easygui.
>>
>> I was using the following script for testing:
> <snip>
> 
>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive sort
>> TypeError: must use keyword argument for key function
> 
> Change the line to
> 
> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))

The key function must take one arg, not two, as with Gabriel's solution: 
str.lower.



From ethan at stoneleaf.us  Sun Feb 22 16:20:59 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 22 Feb 2009 13:20:59 -0800
Subject: datetime.time and midnight
In-Reply-To: <aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
References: <mailman.427.1235256686.11746.python-list@python.org>	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
	<aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
Message-ID: <49A1C1BB.5070506@stoneleaf.us>

Tim Rowe wrote:
> 2009/2/22 Mark Dickinson <dickinsm at gmail.com>:
>   
>> On Feb 21, 10:44 pm, Ethan Furman <et... at stoneleaf.us> wrote:
>>
>>     
>>> --> midnight = datetime.time(0,0,0)
>>> --> bool(midnight)
>>> False
>>>       
>> I'd call this a bug.
>>     
>
> No more so than zero being false. Zero exists too (check my bank
> balance). Once you've accepted non-Boolean types having Boolean
> values, the logic of what value they have is always going to be a bit
> hairy. If you're unsure of the logic, just test against a value or a
> range. After all, what value do you *expect* a time of day to have
> when interpreted as a Boolean? If you don't have an expectation, why
> are you interpreting it as a Boolean?
>
>   
As Steve Holden correctly guessed, my use case is with databases (more 
accurately, with dBase and VFP dbf files).  As I was creating a dbf 
date/datetime/time wrapper for the existing datetime data types I 
noticed that it is *not* possible to have a false date, nor a false 
date/time, so I was surprised with the false time.

So partly because of dates and datetimes, partly because objects are 
true unless special effort is made to have them be false, and partly 
because midnight is in fact a time of day, and not a lack of a time of 
day, I do indeed expect it to be True.
--
~Ethan~


From mccredie at gmail.com  Sun Feb 22 16:23:47 2009
From: mccredie at gmail.com (Matimus)
Date: Sun, 22 Feb 2009 13:23:47 -0800 (PST)
Subject: Problem with lists.
References: <gnsdo4$mvc$2@aioe.org>
Message-ID: <dc650824-f2f9-4bfc-9750-3cdf22cd0f0d@f20g2000yqg.googlegroups.com>

On Feb 20, 8:12?am, "ssd" <c... at d.com> wrote:
> Hi,
>
> In the following code, (in Python 2.5)
> I was expecting to get in "b" variable the values ?b: [[0, 0], [0, 1],[0,
> 2], [0, 3],[0, 4], [1, 0],[1, 1], [1, 2], .....]
> But I get only the last value [4,4], b: b: [[4, 4], [4, 4], [4, 4], ... ]
>
> My code:
>
> a = ["",""]
> b = []
>
> for i in range (0,5):
> ? ? for j in range (0,5):
> ? ? ? ? a[0] = i
> ? ? ? ? a[1] = j
> ? ? ? ? print "a: " + str(a)
> ? ? ? ? b.append(a)
>
> print "b: " + str(b)
>
> what is worng in the code?
>
> Thanks,
> Bye,

The problem is that `a' is the name of a list object. When you change
the contents of that list object you are simply mutating that object.
You then append that list object to list `b'. But, you aren't creating
a new list, you are simply mutating the same list object over and over
and appending it to list `b'. So list `b' contains 5 references to the
same object.

A couple of things I would do differently. There is no reason to
declare `a' outside of the loop. This isn't C you don't have to
declare your variables before they are needed. `range(0, 5)' is
usually just written `range(5)'. Also, check out  `xrange'.


Here are a couple of examples of alternatives:

construct new lists and append them in the inner loop:

b = []
for i in range(5):
    for j in range(5):
        b.append([i, j])
print b


check out list comprehension:

b = [[i, j] for i in range(5) for j in range(5)]
print b


Matt


From tjreedy at udel.edu  Sun Feb 22 16:28:48 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 22 Feb 2009 16:28:48 -0500
Subject: Forwarding keyword arguments from one function to another
In-Reply-To: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
Message-ID: <gnsg2f$ne6$3@ger.gmane.org>

Ravi wrote:
> The following code didn't work:

In the future, explain "didn't work".
Wrong output? give actual (copy and paste) and expected.
Error message? give traceback (copy and paste).



From clp2 at rebertia.com  Sun Feb 22 16:41:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 13:41:39 -0800
Subject: Python 3 and easygui problem
In-Reply-To: <gnsfic$ne6$2@ger.gmane.org>
References: <49A0D88F.4010806@internode.on.net>
	<50697b2c0902212105g5594e030h9f7cbb721780ef09@mail.gmail.com>
	<gnsfic$ne6$2@ger.gmane.org>
Message-ID: <50697b2c0902221341n18ff4926y739017c912e31412@mail.gmail.com>

On Sun, Feb 22, 2009 at 1:20 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> Chris Rebert wrote:
>>
>> On Sat, Feb 21, 2009 at 8:46 PM, Peter Anderson
>> <peter.anderson at internode.on.net> wrote:
>>>
>>> I have just installed Python 3. I have been using Tkinter and easygui
>>> (with
>>> Python 2.5.4) for any GUI needs. I have just started to port some of my
>>> existing scripts to Python 3 and discovered problems with easygui.
>>>
>>> I was using the following script for testing:
>>
>> <snip>
>>
>>> File "C:\Python30\lib\site-packages\easygui.py", line 824, in __choicebox
>>> choices.sort( lambda x,y: cmp(x.lower(), y.lower())) # case-insensitive
>>> sort
>>> TypeError: must use keyword argument for key function
>>
>> Change the line to
>>
>> choices.sort(key=lambda x,y: cmp(x.lower(), y.lower()))
>
> The key function must take one arg, not two, as with Gabriel's solution:
> str.lower.

Yeah, I was too quick on the trigger and mixed up key and cmp.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dineshbvadhia at hotmail.com  Sun Feb 22 16:47:22 2009
From: dineshbvadhia at hotmail.com (dineshv)
Date: Sun, 22 Feb 2009 13:47:22 -0800 (PST)
Subject: Python on 64-bit Windows Vista
Message-ID: <7bb9f5c5-400c-4ae0-86f4-ecc589d083ed@a12g2000yqm.googlegroups.com>

Does anyone have experience of working with Python and very large text
files (> 10Gb) on 64-bit Windows Vista?

The problem is that my Python program - to perform simple data
processing on the 10Gb file - never completes and ends with an error.
When I reduce the size of the file (< 5Gb) the program works
perfectly.  So, it is not my code!

This is not the first time that this has happened and I'm wondering
what is it about Python and/or 64-bit Vista that causes these
inexplicable errors when processing very large text files?

Dinesh


From sjmachin at lexicon.net  Sun Feb 22 16:58:21 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 13:58:21 -0800 (PST)
Subject: Python 3 and easygui problem
References: <op.upqsm0g6x6zn5v@gabriel.sleipnir-bsas>
	<49A13F8C.1000506@internode.on.net> 
	<mailman.473.1235337532.11746.python-list@python.org>
Message-ID: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>

On Feb 23, 8:18?am, Terry Reedy <tjre... at udel.edu> wrote:
> Peter Anderson wrote:
> > Gabriel Genellina said:
>
> > That's very short-lived; cmp is gone in 3.0.1 (should not have existed
> > in 3.0 in the first place).
> > Try with:
> > choices.sort(key=str.lower)
>
> > Gabriel,
>
> > That's worked fine - thank you. I think I now have a version of
> > easygui.py that works with Python 3, probably needs a bit more testing.
>
> Can you please make it available thru PyPI?

Are you 100% certain that easygui is not being maintained any more? If
so, it's rather sudden; the latest released version is "version 0.85
(2009-01-16)" ... see
 http://easygui.sourceforge.net/download/easygui_v0.85.html

Did you mistake the OP for the author/maintainer??

Has the OP tried to contact the author/maintainer of easygui [the
usually-recommended approach to problems with not-widely-used third-
party modules]?

Don't you think the author/maintainer might like to be consulted
before you incite an OP to claim-jump his package name on PyPI?


From peke at iki.fi  Sun Feb 22 17:10:58 2009
From: peke at iki.fi (=?ISO-8859-1?Q?Pekka_Kl=E4rck?=)
Date: Mon, 23 Feb 2009 00:10:58 +0200
Subject: Find the location of a loaded module
In-Reply-To: <op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
References: <e572e944-1f44-4740-87fc-4bb979e1fd16@v42g2000yqj.googlegroups.com>
	<5879412d-ffba-4fd9-82b7-7e798dc425e3@f3g2000yqf.googlegroups.com>
	<op.upowe3eqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <7dedbb6d0902221410l68c9e174h5cdd9beebc1fb42@mail.gmail.com>

2009/2/21 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
>
> Use packages. Make act1 and act2 packages by creating __init__.py files.

That's how I'd do it too. The code would be also more easy to
understand and maintain:

import act1
import act2

act1.story()
act2.story()


Alternative solution would be using reload function after changing sys.path.

Cheers,
    .peke


From peter.anderson at internode.on.net  Sun Feb 22 17:17:03 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 09:17:03 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
References: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
Message-ID: <49A1CEDF.7020609@internode.on.net>

John Machin said:

Has the OP tried to contact the author/maintainer of easygui [the
usually-recommended approach to problems with not-widely-used third-
party modules]?

Don't you think the author/maintainer might like to be consulted
before you incite an OP to claim-jump his package name on PyPI?

The OP (I presume you mean me) has tried to contact Steve Ferg (the 
original developer) but I have not had a reply yet. See my e-mail above; 
it is NOT my intention to place my modified script on PyPI as I AM NOT 
the original developer. My claim to fame is changing a few "import" and 
"print" statements and getting some useful advice from other members of 
this list.

I am happy to make my modified script available unofficially and if 
Steve does contact me I would prefer to pass it on to him for his 
consideration.

This little project started out to solve a personal need not to 
plagiarise or usurp the rights and skills of another developer. I was 
happy to make my simple effort available, unofficially, in return for 
help from other list members.

I hope that resolves the issue.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From peter.anderson at internode.on.net  Sun Feb 22 17:58:06 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 09:58:06 +1100
Subject: Python 3 and easygui problem
Message-ID: <49A1D87E.4050805@internode.on.net>

Terry,

I have not used PyPI before and feel a little uneasy about putting this 
modified script into such a public place. I have previously contacted 
Steve Ferg (the original developer of EasyGui) but have not had a reply. 
Clearly the bulk of the work is his still where as the modifications are 
mine (and several helpers from the Python List).

Until I work out what I ought to do I have attached a copy of my script 
(and the test script I have been using) as is. I would really appreciate 
any comments. If Steve does not reply and further testing proves my 
modified script is sound then I will certainly look at a 'public' release.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6



From sjmachin at lexicon.net  Sun Feb 22 18:24:10 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 15:24:10 -0800 (PST)
Subject: Python 3 and easygui problem
References: <7e8a2b8e-4892-4d0d-bf6f-64c8b2a9910d@p13g2000yqc.googlegroups.com>
	<mailman.479.1235341034.11746.python-list@python.org>
Message-ID: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>

On Feb 23, 9:17?am, Peter Anderson <peter.ander... at internode.on.net>
wrote:
> John Machin said:
>
> Has the OP tried to contact the author/maintainer of easygui [the
> usually-recommended approach to problems with not-widely-used third-
> party modules]?
>
> Don't you think the author/maintainer might like to be consulted
> before you incite an OP to claim-jump his package name on PyPI?
>
> The OP (I presume you mean me) has tried to contact Steve Ferg (the
> original developer) but I have not had a reply yet. See my e-mail above;
> it is NOT my intention to place my modified script on PyPI as I AM NOT
> the original developer. My claim to fame is changing a few "import" and
> "print" statements and getting some useful advice from other members of
> this list.
>
> I am happy to make my modified script available unofficially and if
> Steve does contact me I would prefer to pass it on to him for his
> consideration.
>
> This little project started out to solve a personal need not to
> plagiarise or usurp the rights and skills of another developer. I was
> happy to make my simple effort available, unofficially, in return for
> help from other list members.
>
> I hope that resolves the issue.

Thank you, but your intentions stated above are just fine and what I
presumed. The issue is not with you but with Terry suggesting that you
should "make it available thru PyPI" with no qualification or caveat
at all -- the knowledge that you had attempted to contact Steve Ferg
and have not yet had a response was not available on c.l.py and in any
case is not a justification for incitement to hijack.


From james.m.pearson at gmail.com  Sun Feb 22 19:15:40 2009
From: james.m.pearson at gmail.com (James Pearson)
Date: Sun, 22 Feb 2009 16:15:40 -0800
Subject: pickle.load() on an dictionary of dictionaries doesn't load full data
	structure on first call
Message-ID: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>

I've been using irclib to write a simple irc bot, and I was running into
some difficulties with pickle.  Upon some experimentation with pdb, I found
that pickle.load() doesn't load *all* of the data the _first_ time it's
called.

For instance, I have this dictionary pickled:
{'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
The first time I pickle.load() it, I get this:
{'xiong_chiamiov': {'name': 'James Pearson'}}
The 2nd time, I get the full thing.

Is this a bug in pickle, something wrong with the way I'm approaching this,
or what?  Full code is available at: http://github.com/xiongchiamiov/mpu/

-- 
James Pearson
--
The best way to predict the future is to invent it.
 - Alan Kay
--
GCS/MU d- s+:- a--- C++(++++)>$ ULC+(++)>$ P(+) L+++>++++$ !E W++(+++)$>$
N+(++) o? K-- w--- O? M--(+) V? PS+(--) PE++() Y+(++) PGP- !t !5 !X R-
tv-(--) b+>+++ DI+(++) D G e>++ h- r y- [http://tinyurl.com/23uv8t]
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From rozzin at geekspace.com  Sun Feb 22 19:46:35 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 19:46:35 -0500
Subject: choosing a default text-encoding in Python programs (was: To unicode
	or not to unicode)
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
	<mailman.455.1235314170.11746.python-list@python.org>
Message-ID: <87hc2mnfo4.fsf_-_@slice.rozzin.com>

Denis Kasak <denis.kasak at gmail.com> writes:
>
> > > Python "assumes" ASCII and if the decodes/encoded text doesn't
> > > fit that encoding it refuses to guess.
> >
> > Which is reasonable given that Python is programming language where it's
> > better to have more conservative assumption about encodings so errors
> > can be more quickly diagnosed.  A newsreader however is a different
> > beast, where it's better to make a less conservative assumption that's
> > more likely to display messages correctly to the user.  Assuming ISO
> > 8859-1 in the absense of any specified encoding allows the message to be
> > correctly displayed if the character set is either ISO 8859-1 or ASCII.
> > Doing things the "pythonic" way and assuming ASCII only allows such
> > messages to be displayed if ASCII is used.
>
> Reading this paragraph, I've began thinking that we've misunderstood
> each other. I agree that assuming ISO 8859-1 in the absence of
> specification is a better guess than most (since it's more likely to
> display the message correctly).

So, yeah--back on the subject of programming in Python and supporting
charactersets beyond ASCII:

If you have to make an assumption, I'd really think that it'd be
better to use whatever the host OS's default is, if the host OS has
such a thing--using an assumption of ISO 8859-1 works only in select
regions on unix systems, and may fail even in those select regions on
Windows, Mac OS, and other systems; without the OS considerations,
just the regional constraints are likely to make an ISO-8859-1
assumption result in /incorrect/ results anywhere eastward of central
Europe. Is a user in Russia (or China, or Japan) *really* most likely
to be using ISO 8859-1?

As a point of reference, here's what's in the man-pages that I have
installed (note the /complete/ and conspicuous lack of references to
even some notable eastern languages or character-sets, such as Chinese
and Japanese, in the /entire/ ISO-8859 spectrum):

   "ISO 8859 Alphabets
       The full set of ISO 8859 alphabets includes:

       ISO 8859-1    West European languages (Latin-1)
       ISO 8859-2    Central and East European languages (Latin-2)
       ISO 8859-3    Southeast European and miscellaneous languages (Latin-3)
       ISO 8859-4    Scandinavian/Baltic languages (Latin-4)
       ISO 8859-5    Latin/Cyrillic
       ISO 8859-6    Latin/Arabic
       ISO 8859-7    Latin/Greek
       ISO 8859-8    Latin/Hebrew
       ISO 8859-9    Latin-1 modification for Turkish (Latin-5)
       ISO 8859-10   Lappish/Nordic/Eskimo languages (Latin-6)
       ISO 8859-11   Latin/Thai
       ISO 8859-13   Baltic Rim languages (Latin-7)
       ISO 8859-14   Celtic (Latin-8)
       ISO 8859-15   West European languages (Latin-9)
       ISO 8859-16   Romanian (Latin-10)"

       "ISO 8859-1 supports the following languages: Afrikaans, Basque,
       Catalan, Danish, Dutch, English, Faeroese, Finnish, French,
       Galician, German, Icelandic, Irish, Italian, Norwegian,
       Portuguese, Scottish, Spanish, and Swedish."

       "ISO   8859-2  supports  the  following  languages:  Albanian,  Bosnian,
       Croatian, Czech, English, Finnish, German,  Hungarian,  Irish,  Polish,
       Slovak, Slovenian and Sorbian."

       "ISO 8859-7 encodes the characters used in modern monotonic
       Greek."

       "ISO 8859-9, also known as the "Latin Alphabet No. 5", encodes
       the characters used in Turkish."

       "ISO 8859-15 supports the following languages: Albanian, Basque, Breton,
       Catalan,  Danish,  Dutch,  English, Estonian, Faroese, Finnish, French,
       Frisian,  Galician,  German,  Greenlandic,  Icelandic,  Irish   Gaelic,
       Italian,  Latin,  Luxemburgish,  Norwegian, Portuguese, Rhaeto-Romanic,
       Scottish Gaelic, Spanish, and Swedish."

       "ISO  8859-16  supports  the  following  languages:  Albanian,  Bosnian,
       Croatian, English, Finnish, German, Hungarian, Irish, Polish, Romanian,
       Slovenian and Serbian."

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From rozzin at geekspace.com  Sun Feb 22 19:52:25 2009
From: rozzin at geekspace.com (Joshua Judson Rosen)
Date: Sun, 22 Feb 2009 19:52:25 -0500
Subject: datetime.time and midnight
References: <mailman.427.1235256686.11746.python-list@python.org>
	<0e8ef14d-ffa9-4513-abe2-404aeb91a079@i38g2000yqd.googlegroups.com>
	<aee48b3c0902220909m19c83571se6033b9e55503f04@mail.gmail.com>
	<mailman.475.1235338060.11746.python-list@python.org>
Message-ID: <873ae6nfee.fsf@slice.rozzin.com>

Ethan Furman <ethan at stoneleaf.us> writes:
>
> [...]partly because midnight is in fact a time of day, and not a lack of
> a time of day, I do indeed expect it to be True.

While it's not a lack of `time of day', it /is/ a lack of /elapsed/
time in the day ;)

Just as if you were using a plain integer or float to count the time :)

-- 
Don't be afraid to ask (Lf.((Lx.xx) (Lr.f(rr)))).


From sbassi at clubdelarazon.org  Sun Feb 22 19:53:25 2009
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Sun, 22 Feb 2009 21:53:25 -0300
Subject: Problem trying to install ReportLab with easy_install
In-Reply-To: <364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>
References: <9e2f512b0902212206q1054875ci3bbe5026f74f62a3@mail.gmail.com>
	<364299f40902220507i6c5520dcyb6547c6bf6a848e3@mail.gmail.com>
Message-ID: <9e2f512b0902221653m7f82018clb839f0f7f1f7d587@mail.gmail.com>

On Sun, Feb 22, 2009 at 10:07 AM, Garrett Cooper <yanegomi at gmail.com> wrote:

>    It's not building lib_renderPM_libart properly, or it's a typo
> that supposed to be librenderPM_libart, or bad LDFLAGS...
>    More details need to be provided like an ls of your site-packages
> directory and a partial ls of your local library directory (ls
> /usr/?local/?lib/lib*render*libart*, etc).
>

sbassi at hp:~$ ls /usr/lib/lib*ren*
/usr/lib/libktorrent.la        /usr/lib/libXrender.la
/usr/lib/libktorrent.so        /usr/lib/libXrender.so
/usr/lib/libktorrent.so.0      /usr/lib/libXrender.so.1
/usr/lib/libktorrent.so.0.0.0  /usr/lib/libXrender.so.1.3.0
/usr/lib/libXrender.a
sbassi at hp:~$ ls /usr/lib/libart*
/usr/lib/libart_lgpl_2.so.2        /usr/lib/libartsflow_idl.so.1
/usr/lib/libart_lgpl_2.so.2.3.16   /usr/lib/libartsflow_idl.so.1.0.0
/usr/lib/libart_lgpl.so.2          /usr/lib/libartsflow.so.1
/usr/lib/libart_lgpl.so.2.2.0      /usr/lib/libartsflow.so.1.0.0
/usr/lib/libartscbackend.la        /usr/lib/libartsgslplayobject.la
/usr/lib/libartscbackend.so.0      /usr/lib/libartsgslplayobject.so.0
/usr/lib/libartscbackend.so.0.0.0  /usr/lib/libartsgslplayobject.so.0.0.0
/usr/lib/libartsc.so.0             /usr/lib/libartskde.so.1
/usr/lib/libartsc.so.0.0.0         /usr/lib/libartskde.so.1.2.0
/usr/lib/libartsdsp.so.0           /usr/lib/libartswavplayobject.la
/usr/lib/libartsdsp.so.0.0.0       /usr/lib/libartswavplayobject.so.0
/usr/lib/libartsdsp_st.so.0        /usr/lib/libartswavplayobject.so.0.0.0
/usr/lib/libartsdsp_st.so.0.0.0

(t6)sbassi at hp:~/test/virtualenv-1.3.2/t6$ ls lib/python2.5/site-packages/
easy-install.pth            setuptools.pth
setuptools-0.6c9-py2.5.egg  xlwt-0.7.0-py2.5.egg

This is a virtualenv created with --no-site-packages (to have a clean start).
Other easy_install works, but this one, doesn't :(


From peter.anderson at internode.on.net  Sun Feb 22 19:55:35 2009
From: peter.anderson at internode.on.net (Peter Anderson)
Date: Mon, 23 Feb 2009 11:55:35 +1100
Subject: Python 3 and easygui problem
In-Reply-To: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
References: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
Message-ID: <49A1F407.7080400@internode.on.net>

John Machin said:*

*"... the knowledge that you had attempted to contact Steve Ferg and 
have not yet had a response was not available on c.l.py and in any case 
is not a justification for incitement to hijack."

John, I resent the implication that I am trying to hijack Steve's 
project. This was never my intention. I am uneasy about posting this 
rebuttal on the list as this is not what I think lists like this are 
for; but given your response I will post this one reply in my defence. I 
think that if you want to follow up this matter do it off line.

For your information I have since been in contact with Steve and sent 
him a copy of my code. Its been my experience that there are some users 
of these lists who ought to hesitate before they jump in because they 
often are not in full possession of all the facts.

Once again (and for the last time) this was a personal project, I 
offered to share my additions to Steve's work in an informal way to 
anyone who helped me with fixing error responses I was getting - its a 
very long bow to draw to say this constitutes hijacking. It was NEVER my 
intention to hijack anyone's work and I resent the accusation.

To end, I have included below a statement that I added to the script 
that I sent to Terry:

-------------------------------------------------
This is an experimental version of EasyGui that has converted the latest
'official' version so that it will run under Python 3.0.1
The script is still being tested and any comments would be appreciated.

NOTE: This version of the script is not from Steve Ferg although his
contribution of the original script is acknowledged. This script is
released under the same Creative Commons Attribution 2.0 License as the
original script.
Modified by: Peter Anderson
Date: Monday, 23 February 2009
Contact: peterjohnanderson at gmail.com
-------------------------------------------------

As far as I am concerned that is the end of the matter on this list. 
Feel free to contact me off line if you want to follow up this post.

Regards,
Peter
-- 
*Peter Anderson*
There is nothing more difficult to take in hand, more perilous to 
conduct, or more uncertain in its success, than to take the lead in the 
introduction of a new order of things?Niccolo Machiavelli, /The Prince/, 
ch. 6


From bignose+hates-spam at benfinney.id.au  Sun Feb 22 20:05:13 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Mon, 23 Feb 2009 12:05:13 +1100
Subject: choosing a default text-encoding in Python programs
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net>
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca>
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca>
	<mailman.455.1235314170.11746.python-list@python.org>
	<87hc2mnfo4.fsf_-_@slice.rozzin.com>
Message-ID: <87y6vyhsja.fsf@benfinney.id.au>

Joshua Judson Rosen <rozzin at geekspace.com> writes:

> If you have to make an assumption, I'd really think that it'd be
> better to use whatever the host OS's default is, if the host OS has
> such a thing--using an assumption of ISO 8859-1 works only in select
> regions on unix systems, and may fail even in those select regions
> on Windows, Mac OS, and other systems; without the OS
> considerations, just the regional constraints are likely to make an
> ISO-8859-1 assumption result in /incorrect/ results anywhere
> eastward of central Europe. Is a user in Russia (or China, or Japan)
> *really* most likely to be using ISO 8859-1?

The fallacy in the above is to assume that a given programmer will
only be opening files created in their current locale. I say that is a
fallacy, because programmers in fact open program files created all
over the world in different locales; and those files should, where
possible, be interpreted by Python the same everwhere.

Assuming a *single*, defined, encoding in the absence of an explicit
declaration at least makes all Python installations (of a given
version) read any program file the same in any locale.

-- 
 \           ?If [a technology company] has confidence in their future |
  `\      ability to innovate, the importance they place on protecting |
_o__)     their past innovations really should decline.? ?Gary Barnett |
Ben Finney


From marduk at letterboxes.org  Sun Feb 22 20:10:56 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Sun, 22 Feb 2009 20:10:56 -0500
Subject: pickle.load() on an dictionary of dictionaries doesn't load
	full data structure on first call
In-Reply-To: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
References: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
Message-ID: <1235351456.28498.19.camel@centar.nbk>

On Sun, 2009-02-22 at 16:15 -0800, James Pearson wrote:
> I've been using irclib to write a simple irc bot, and I was running
> into some difficulties with pickle.  Upon some experimentation with
> pdb, I found that pickle.load() doesn't load *all* of the data the
> _first_ time it's called.
> 
> For instance, I have this dictionary pickled:
> {'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
> The first time I pickle.load() it, I get this:
> {'xiong_chiamiov': {'name': 'James Pearson'}}
> The 2nd time, I get the full thing.
> 
> Is this a bug in pickle, something wrong with the way I'm approaching
> this, or what?  Full code is available at:
> http://github.com/xiongchiamiov/mpu/
> 

In general it's a bad idea to point the list to a full.  It's usually
wiser to deduce the issue to a relatively small, easily runnable,
snippet of code and then paste that snippet in your post.  Readers
usually don't want to have to read through your entire program to
understand what you are asking them.

Having said that, pickle is for serializing data.  You shouldn't be
opening a file in read/write/append mode and dumping and loading to the
same file object.  It's not a multi-access database like a DBMS is.  The
basic idea is:

     1. open (empty) file write-only.
     2. dump object(s) to file.
     3. close file

or 

     1. open file read-only
     2. load object(s) from file
     3. close file

Anything other than the two may lead to undesired/undefined behavior.

But the likely answer to your question is that your pickle file has (at
least) 2 objects stored in it.  And so on each load you get subsequent
objects.  That's probably the "undesired" affect of opening the file in
append mode.



From sjmachin at lexicon.net  Sun Feb 22 20:16:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 17:16:47 -0800 (PST)
Subject: choosing a default text-encoding in Python programs (was: To 
	unicode or not to unicode)
References: <rNOSPAMon-FD2EFB.18571319022009@news.gha.chartermi.net> 
	<MPG.240aa3fa43f4cb299897c9@news.individual.de>
	<gnq1dr$v2n$1@rumours.uwaterloo.ca> 
	<MPG.240aae2e3eecab709897ca@news.individual.de>
	<gnq6se$n4$1@rumours.uwaterloo.ca> 
	<mailman.455.1235314170.11746.python-list@python.org>
	<87hc2mnfo4.fsf_-_@slice.rozzin.com>
Message-ID: <f4727a34-132a-4b48-aab7-460c98cd27ed@x10g2000yqk.googlegroups.com>

On Feb 23, 11:46?am, Joshua Judson Rosen <roz... at geekspace.com> wrote:
> Denis Kasak <denis.ka... at gmail.com> writes:
>
> > > > Python "assumes" ASCII and if the decodes/encoded text doesn't
> > > > fit that encoding it refuses to guess.
>
> > > Which is reasonable given that Python is programming language where it's
> > > better to have more conservative assumption about encodings so errors
> > > can be more quickly diagnosed. ?A newsreader however is a different
> > > beast, where it's better to make a less conservative assumption that's
> > > more likely to display messages correctly to the user. ?Assuming ISO
> > > 8859-1 in the absense of any specified encoding allows the message to be
> > > correctly displayed if the character set is either ISO 8859-1 or ASCII.
> > > Doing things the "pythonic" way and assuming ASCII only allows such
> > > messages to be displayed if ASCII is used.
>
> > Reading this paragraph, I've began thinking that we've misunderstood
> > each other. I agree that assuming ISO 8859-1 in the absence of
> > specification is a better guess than most (since it's more likely to
> > display the message correctly).
>
> So, yeah--back on the subject of programming in Python and supporting
> charactersets beyond ASCII:
>
> If you have to make an assumption, I'd really think that it'd be
> better to use whatever the host OS's default is, if the host OS has
> such a thing--using an assumption of ISO 8859-1 works only in select
> regions on unix systems, and may fail even in those select regions on
> Windows, Mac OS, and other systems; without the OS considerations,
> just the regional constraints are likely to make an ISO-8859-1
> assumption result in /incorrect/ results anywhere eastward of central
> Europe. Is a user in Russia (or China, or Japan) *really* most likely
> to be using ISO 8859-1?
>
> As a point of reference, here's what's in the man-pages that I have
> installed (note the /complete/ and conspicuous lack of references to
> even some notable eastern languages or character-sets, such as Chinese
> and Japanese, in the /entire/ ISO-8859 spectrum):

1. As a point of reference for what?
2. The ISO 8859 character sets were deliberately restricted to scripts
that would fit in 8 bits. So Chinese, Japanese, Korean and Vietnamese
aren't included. Note that Chinese and Japanese already each had
*multiple* legacy (i.e. non-Unicode) character sets ... they (and the
rest the world) don't want/need yet another character set for each
language and never did want/need one.


From sjmachin at lexicon.net  Sun Feb 22 20:26:05 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 17:26:05 -0800 (PST)
Subject: Python 3 and easygui problem
References: <8e5a80a0-670f-43b2-86c5-be3239c91c93@v38g2000yqb.googlegroups.com>
	<mailman.483.1235350548.11746.python-list@python.org>
Message-ID: <d50c720d-b195-4e1a-8a64-aec31a2bf529@j8g2000yql.googlegroups.com>

On Feb 23, 11:55?am, Peter Anderson <peter.ander... at internode.on.net>
wrote:
> John Machin said:*
>
> *"... the knowledge that you had attempted to contact Steve Ferg and
> have not yet had a response was not available on c.l.py and in any case
> is not a justification for incitement to hijack."
>
> John, I resent the implication that I am trying to hijack Steve's
> project. This was never my intention. I am uneasy about posting this
> rebuttal on the list as this is not what I think lists like this are
> for; but given your response I will post this one reply in my defence. I
> think that if you want to follow up this matter do it off line.

I'll keep it online for the same reason that you did.

Please re-read what I wrote:
"""
Thank you, but your intentions stated above are just fine and what I
presumed. The issue is not with you but with Terry ...
"""

How you managed to construe that as an implication that you were
trying to hijack Steve's project, I can't imagine.

You wrote: "It was NEVER my intention to hijack anyone's work and I
resent the accusation."

There was no such accusation.



From steven at REMOVE.THIS.cybersource.com.au  Sun Feb 22 21:43:59 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 02:43:59 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <pan.2009.02.23.02.43.59@REMOVE.THIS.cybersource.com.au>

On Sun, 22 Feb 2009 16:13:02 +0100, Torsten Mohr wrote:

> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?

Never, and never.


> Integers are obviously passed by value, lists and dicts by reference.

Your error is assuming that pass-by-value and pass-by-reference are the 
only two possibilities, consequently you are misinterpreting what you see.

Python uses the same evaluation strategy regardless of the type of object 
being passed. Sometimes that strategy looks something like pass-by-value, 
and sometimes it looks something like pass-by-reference, but in fact it 
always behaves consistently no matter what object you use.


> Is there a general rule?  Some common formulation?


http://en.wikipedia.org/wiki/Evaluation_strategy#Call_by_sharing
http://effbot.org/zone/call-by-object.htm




-- 
Steven


From ccormie at aussiemail.com.au  Sun Feb 22 22:56:09 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Mon, 23 Feb 2009 14:56:09 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a culprit
	.dll and symbol?
Message-ID: <01b213c7$0$20626$c3e8da3@news.astraweb.com>

Hi,

I've been Googling around on a moderately common Windows Python problem: 
a mismatch between the symbols a python extension thinks are available 
and the contents of the associated DLL. Python users running into this 
problem are greeted with:

import <somemodule>
"ImportError: DLL load failed: The specified procedure could not be found."

That's it: no mention of which dll nor which symbol is causing the 
problem. Both these pieces of information are helpful/important in 
resolving this class of problem: how does one get Python to dump this 
debugging data?

(>python -v -d
doesn't help, BTW)

Regards,
Chris


From xiong.chiamiov at gmail.com  Sun Feb 22 22:58:27 2009
From: xiong.chiamiov at gmail.com (James Pearson)
Date: Sun, 22 Feb 2009 19:58:27 -0800
Subject: pickle.load() on an dictionary of dictionaries doesn't load full 
	data structure on first call
In-Reply-To: <1235351456.28498.19.camel@centar.nbk>
References: <7dbb3da80902221615sd6ecb28g327a5a56e2b9c4fc@mail.gmail.com>
	<1235351456.28498.19.camel@centar.nbk>
Message-ID: <7dbb3da80902221958g4dc579f3k21e31e9468f2a619@mail.gmail.com>

Ah, thank you, you explained that quite well and opened my eyes to some
things I very much need to improve in my code.  I'll keep those
list-etiquette things in mind next time.

On Sun, Feb 22, 2009 at 5:10 PM, Albert Hopkins <marduk at letterboxes.org>wrote:

> On Sun, 2009-02-22 at 16:15 -0800, James Pearson wrote:
> > I've been using irclib to write a simple irc bot, and I was running
> > into some difficulties with pickle.  Upon some experimentation with
> > pdb, I found that pickle.load() doesn't load *all* of the data the
> > _first_ time it's called.
> >
> > For instance, I have this dictionary pickled:
> > {'xiong_chiamiov': {'name': 'James Pearson', 'distro': 'Arch'}}
> > The first time I pickle.load() it, I get this:
> > {'xiong_chiamiov': {'name': 'James Pearson'}}
> > The 2nd time, I get the full thing.
> >
> > Is this a bug in pickle, something wrong with the way I'm approaching
> > this, or what?  Full code is available at:
> > http://github.com/xiongchiamiov/mpu/
> >
>
> In general it's a bad idea to point the list to a full.  It's usually
> wiser to deduce the issue to a relatively small, easily runnable,
> snippet of code and then paste that snippet in your post.  Readers
> usually don't want to have to read through your entire program to
> understand what you are asking them.
>
> Having said that, pickle is for serializing data.  You shouldn't be
> opening a file in read/write/append mode and dumping and loading to the
> same file object.  It's not a multi-access database like a DBMS is.  The
> basic idea is:
>
>     1. open (empty) file write-only.
>     2. dump object(s) to file.
>     3. close file
>
> or
>
>     1. open file read-only
>     2. load object(s) from file
>     3. close file
>
> Anything other than the two may lead to undesired/undefined behavior.
>
> But the likely answer to your question is that your pickle file has (at
> least) 2 objects stored in it.  And so on each load you get subsequent
> objects.  That's probably the "undesired" affect of opening the file in
> append mode.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
James Pearson
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From steven at REMOVE.THIS.cybersource.com.au  Sun Feb 22 23:09:17 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 04:09:17 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
Message-ID: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>

On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:

> as far as i understand things, the best model is:
> 
> 1 - everything is an object
> 2 - everything is passed by reference 

Except that is wrong. If it were true, you could do this:

def swap(x, y):
    y, x = x, y

a = 1
b = 2
swap(a, b)
assert a == 2 and b == 1


but you can't, it does not work. Ergo, parameter passing in Python does 
not have the same semantics as languages that use pass-by-reference, such 
as Pascal and Basic. That means that even if you can justify the claim 
"Python is pass-by-reference" by some technical argument (and I don't 
believe you can), it is misleading to make that claim without further 
qualifications.


> 3 - some objects are immutable

All objects are passed the same way, regardless of whether they are 
mutable or immutable.


> 4 - some (immutable?) objects are cached/reused by the system

That's irrelevant. Caching affects the creation of new objects, but has 
no effect on argument passing.



-- 
Steven


From venutaurus539 at gmail.com  Sun Feb 22 23:13:23 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Sun, 22 Feb 2009 20:13:23 -0800 (PST)
Subject: How to open a remote file using python.
Message-ID: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>

Hello all,
           I am writing an application where I need to open a shared
file on a remote machine using python script. I tried using the
following function:

f = urllib.open("\\remote_machine\\folder1\\file1.doc")

         I also tried using

class urllib.FancyURLopener(...)

         but didn't work. Can some one help me in this regard.

Thank you in advance,
Venu


From clp2 at rebertia.com  Sun Feb 22 23:21:43 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 20:21:43 -0800
Subject: How to open a remote file using python.
In-Reply-To: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
Message-ID: <50697b2c0902222021h4d545688y57cedf768eae1aab@mail.gmail.com>

On Sun, Feb 22, 2009 at 8:13 PM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> Hello all,
>           I am writing an application where I need to open a shared
> file on a remote machine using python script. I tried using the
> following function:
>
> f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
>         I also tried using
>
> class urllib.FancyURLopener(...)
>
>         but didn't work. Can some one help me in this regard.

That function and class are be for retrieving materials over the web
(typically HTTP/FTP); however, your path suggests you're trying to
access a file over a local Windows network, so those aren't
appropriate. The regular open() function would have a better chance of
working for this. Have you tried it?

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From google at mrabarnett.plus.com  Sun Feb 22 23:25:13 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 04:25:13 +0000
Subject: How to open a remote file using python.
In-Reply-To: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
Message-ID: <49A22529.8000300@mrabarnett.plus.com>

venutaurus539 at gmail.com wrote:
> Hello all,
>            I am writing an application where I need to open a shared
> file on a remote machine using python script. I tried using the
> following function:
> 
> f = urllib.open("\\remote_machine\\folder1\\file1.doc")
> 
>          I also tried using
> 
> class urllib.FancyURLopener(...)
> 
>          but didn't work. Can some one help me in this regard.
> 
What do you mean by "remote machine"? Do you mean you want to open a
file that's in a shared folder on a machine that's on the same local
network?

If it's meant to be a Windows filepath then it should be:

     f = open(r"\\remote_machine\folder1\file1.doc")

(If the file is a Microsoft Word document file, then you won't probably
be able to make much sense of its contents using open().)


From michele.simionato at gmail.com  Sun Feb 22 23:38:40 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Mon, 23 Feb 2009 05:38:40 +0100
Subject: How to inherit from two classes without metaclass clashing ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<mailman.289.1235077114.11746.python-list@python.org>
	<ad658045-3e6b-42d9-82c3-8f0e4f6c95d7@t13g2000yqc.googlegroups.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D686@enbmail01.lsi.com>
Message-ID: <4edc17eb0902222038gbdf39feyb806537c990fca08@mail.gmail.com>

On Sun, Feb 22, 2009 at 2:29 PM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Hi Michele,
>
> I tried understanding how to avoid the metaclasses clashing, and I did read
> the link you referred to below,
> as well as the relevant O'Reilly cookbook chapter (Recipe 20.17. Solving
> Metaclass Conflicts), but seems I do not understand the correct syntax to
> use, as I either get
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 323, in <module>
>     class ListControlMeta(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a
> (non-strict) subclass of the metaclasses of all its bases
>
> or
>
> $ python -u ./failover_pickle_demo09.py
> Traceback (most recent call last):
>   File "./failover_pickle_demo09.py", line 322, in <module>
>     class ListControlMeta(type(wx.Frame), type(CopyAndPaste)):
> TypeError: Error when calling the metaclass bases
>     multiple bases have instance lay-out conflict

This is not a matter of syntax. wx.Frame is a C++-coded class with a
non standard
layout and there is nothing than the recipe can do to solve the
metaclass conflict.
I guess you are using an old version of wx since I cannot reproduce the problem.
Let us see what the wx guys say.


From venutaurus539 at gmail.com  Mon Feb 23 00:02:13 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Sun, 22 Feb 2009 21:02:13 -0800 (PST)
Subject: How to open a remote file using python.
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
Message-ID: <00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>

On Feb 23, 9:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
> venutaurus... at gmail.com wrote:
> > Hello all,
> > ? ? ? ? ? ?I am writing an application where I need to open a shared
> > file on a remote machine using python script. I tried using the
> > following function:
>
> > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
> > ? ? ? ? ?I also tried using
>
> > class urllib.FancyURLopener(...)
>
> > ? ? ? ? ?but didn't work. Can some one help me in this regard.
>
> What do you mean by "remote machine"? Do you mean you want to open a
> file that's in a shared folder on a machine that's on the same local
> network?
>
> If it's meant to be a Windows filepath then it should be:
>
> ? ? ?f = open(r"\\remote_machine\folder1\file1.doc")
>
> (If the file is a Microsoft Word document file, then you won't probably
> be able to make much sense of its contents using open().)

Thanks to all for your brisk replies:

        Yes, my aim is to open a file from another machine in the same
LAN. It also worked using

>>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")

        But now I also have to copy the same file to the local machine
in Python. Do I need to follow any protocols for this?

Thank you,
Venu.













From odeits at gmail.com  Mon Feb 23 00:06:10 2009
From: odeits at gmail.com (odeits)
Date: Sun, 22 Feb 2009 21:06:10 -0800 (PST)
Subject: How to open a remote file using python.
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
	<00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
Message-ID: <69d01028-2a8e-4717-b7e4-ba17fa2ca174@r41g2000yqm.googlegroups.com>

On Feb 22, 9:02?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 23, 9:25?am, MRAB <goo... at mrabarnett.plus.com> wrote:
>
>
>
> > venutaurus... at gmail.com wrote:
> > > Hello all,
> > > ? ? ? ? ? ?I am writing an application where I need to open a shared
> > > file on a remote machine using python script. I tried using the
> > > following function:
>
> > > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>
> > > ? ? ? ? ?I also tried using
>
> > > class urllib.FancyURLopener(...)
>
> > > ? ? ? ? ?but didn't work. Can some one help me in this regard.
>
> > What do you mean by "remote machine"? Do you mean you want to open a
> > file that's in a shared folder on a machine that's on the same local
> > network?
>
> > If it's meant to be a Windows filepath then it should be:
>
> > ? ? ?f = open(r"\\remote_machine\folder1\file1.doc")
>
> > (If the file is a Microsoft Word document file, then you won't probably
> > be able to make much sense of its contents using open().)
>
> Thanks to all for your brisk replies:
>
> ? ? ? ? Yes, my aim is to open a file from another machine in the same
> LAN. It also worked using
>
> >>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")
>
> ? ? ? ? But now I also have to copy the same file to the local machine
> in Python. Do I need to follow any protocols for this?
>
> Thank you,
> Venu.

the copy in shutil will work just fine.
import shutil
shutil.copy(remotepath,localpath)


From clp2 at rebertia.com  Mon Feb 23 00:10:38 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 21:10:38 -0800
Subject: How to open a remote file using python.
In-Reply-To: <00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
References: <a2b34ad4-b5e3-4a02-8804-91b7298114e5@n10g2000vbl.googlegroups.com>
	<mailman.487.1235363116.11746.python-list@python.org>
	<00296096-1b2f-41fa-927a-53b2c33c58ac@n20g2000vba.googlegroups.com>
Message-ID: <50697b2c0902222110n783f9d11xb1c4245ba532e170@mail.gmail.com>

On Sun, Feb 22, 2009 at 9:02 PM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> On Feb 23, 9:25 am, MRAB <goo... at mrabarnett.plus.com> wrote:
>> venutaurus... at gmail.com wrote:
>> > Hello all,
>> >            I am writing an application where I need to open a shared
>> > file on a remote machine using python script. I tried using the
>> > following function:
>>
>> > f = urllib.open("\\remote_machine\\folder1\\file1.doc")
>>
>> >          I also tried using
>>
>> > class urllib.FancyURLopener(...)
>>
>> >          but didn't work. Can some one help me in this regard.
>>
>> What do you mean by "remote machine"? Do you mean you want to open a
>> file that's in a shared folder on a machine that's on the same local
>> network?
>>
>> If it's meant to be a Windows filepath then it should be:
>>
>>      f = open(r"\\remote_machine\folder1\file1.doc")
>>
>> (If the file is a Microsoft Word document file, then you won't probably
>> be able to make much sense of its contents using open().)
>
> Thanks to all for your brisk replies:
>
>        Yes, my aim is to open a file from another machine in the same
> LAN. It also worked using
>
>>>f = urllib.urlopen("\\\remote_machine\\folder\\file.doc")
>
>        But now I also have to copy the same file to the local machine
> in Python. Do I need to follow any protocols for this?

You may find urllib.urlretrieve() useful for accomplishing that.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From denis.kasak at gmail.com  Mon Feb 23 00:54:16 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 06:54:16 +0100
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>

On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>
>> as far as i understand things, the best model is:
>>
>> 1 - everything is an object
>> 2 - everything is passed by reference
>
> Except that is wrong. If it were true, you could do this:
>
> def swap(x, y):
>    y, x = x, y
>
> a = 1
> b = 2
> swap(a, b)
> assert a == 2 and b == 1
>
>
> but you can't, it does not work. Ergo, parameter passing in Python does
> not have the same semantics as languages that use pass-by-reference, such
> as Pascal and Basic. That means that even if you can justify the claim
> "Python is pass-by-reference" by some technical argument (and I don't
> believe you can), it is misleading to make that claim without further
> qualifications.

You could, however, argue that the swap function doesn't work as
expected (e.g. from a Pascal or a C++ POV) simply because the
underlying objects aren't mutable. The objects *do* get passed by
reference; the function doesn't receive a new copy of the object and
it can examine the original object's ID. The actual culprit is not the
way objects are passed but the assignment operator, since it works by
rebinding names (as Andrew Koenig explained) and not by changing the
object itself. If the swap() function could somehow access the
underlying integer object and modify it, swapping of values would
indeed occur because the function *did* get references to the objects
passed to it.

That said, it's a rather convoluted way of explaining what happens and
calling it pass-by-object feels much better. :-)

-- 
Denis Kasak


From sjmachin at lexicon.net  Mon Feb 23 01:38:47 2009
From: sjmachin at lexicon.net (John Machin)
Date: Sun, 22 Feb 2009 22:38:47 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
Message-ID: <5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>

On Feb 23, 2:56?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> Hi,
>
> I've been Googling around on a moderately common Windows Python problem:
> a mismatch between the symbols a python extension thinks are available
> and the contents of the associated DLL. Python users running into this
> problem are greeted with:
>
> import <somemodule>
> "ImportError: DLL load failed: The specified procedure could not be found."
>
> That's it: no mention of which dll nor which symbol is causing the
> problem. Both these pieces of information are helpful/important in
> resolving this class of problem: how does one get Python to dump this
> debugging data?
>
> (>python -v -d
> doesn't help, BTW)

Use -vv ... you need to know exactly which of possibly many
incarnations of somemodule.pyd Python is trying to import from.

Then get a copy of the Dependency Walker from http://www.dependencywalker.com/

Open c:\the\failing\somemodule.pyd with the DW. Look at grumble
messages in the bottom pane. Note: you often get 1 or 2 warning
messages with a pyd that's not having problems. Scroll through all the
modules in the middle pane, looking for grumbles.

If that not-very-technical description [all I've ever needed] doesn't
help, you'll need to read the DW help file (HTFF1K) or wait till
someone who knows what they are doing comes along :-)

By the way, I presume that you are aware that extensions on Windows
are tied to a particular version of Python ... you would have got a
different error message if you had a version mismatch (I think). If
your problem is not obvious, come back here with:
-- what version of Python you are running
-- what DLLs you find in the middle pane whose names match
   (1) MSVC*.DLL
   (2) PYTHON??.DLL

You may need to answer questions about the extension (e.g. compiler/
linker options used) -- is it your extension or a 3rd party's?

HTH,
John


From sternbrightblade at gmail.com  Mon Feb 23 01:51:39 2009
From: sternbrightblade at gmail.com (Tony)
Date: Sun, 22 Feb 2009 22:51:39 -0800
Subject: different errors, return outside function and others
Message-ID: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>

Hi,
I am trying to write a small program for my final for school, everytime i
run my program it gives me a return outside function error (after i fixed
all the indentation errors it throws at me), i am not very good at
programing with python atm, so any help would be appreiciated. and if im
missing somethign please feel free to throw
any suggestions out there.

#This is a Text based RPG
# HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss Hit
Points
def fakemain(): #This is a place holder for me untill im ready to run the
program
start()
    startselection = start()
    if startselection == 1:
        character_creation()
    else:
        #end game (need the code to exit program)

    charselection = character_creation()
    if charselection == 1:
        name = raw_input ('Please Enter Your Name')
        HP = dice_roll2()
        print 'Your HP is ',HP
    elif charselection == 2:
        name = raw_input ('Please Enter Your Name')
        HP = dice_roll()
        print 'Your HP is ',HP
    else:

intro_area()
    introselection = intro_area()
    if introselection == 1:
        print 'A Zombie Attacks you'
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        intro_area()
    else:
        back_yard()
    backyardselection = back_yard()
    if backyardselection == 1:
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    else:
        print 'The Zombie leaps and reaches you before you shut the door.'
        print 'YOU HAVE DIED!!!'
            #reset the game (need the code to reset program)

Alley()
    alleyselection = Alley()
    if alleyselection == 1:
        police_station()
    else:   #The object here is for the person to die if they select option
2
        print 'As you try to get something to munch on 5 zombies attack you'
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    policeselection = police_station()
    if policeselection == 1:
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
        fight(HP, ZHP, weapon)
        death(HP, ZHP, ZBHP)
    else:
        print 'The door mysteriously locked itself'
        police_station()
police_backdoor()
    policebackselection = police_backdoor()
    if policebackselection == 1:
        forest()
    else:
        print 'The Front Door is locked only way out is the backdoor'
        police_backdoor()

    forestselection = forest()
    if forestselection == 1:
        fight(HP, ZBHP, weapon, True)
        death(HP, ZHP, ZBHP)
        end()
    else:
        print 'Jonas reaches you before you get back and eats your brains'
        #End game
    endselection = end()
    if endselection == 1:
        #End program or play rick roll'd haha
    else:
        #reset program


#This mod is the first area you are in
def intro_area():
    introselection = 0
    print ' Welcome to Zombie Survival'
    print ' It is a quite night in Egad, Wisconsin when..You suddenly awake'
    print ' to the sounds from outside. You see sparks outside from your
window.'
    print ' The phone line has been cut. You have nothing to help you fend'
    print ' of attackers. What will you do!!!'
    print
    print '1. Open the Front door?'
    print '2. Go out the back door and towards the alley?'
    while introselection < 1 or introselection > 2
        print 'That area is unavaible please buy the expansion haha'
    return introselection

#This is the second area of the RPG
def back_yard():
    backyardselection = 0
    print ' As you make your way out the back door, a Zombie appears from
the'
    print ' side of the yard. He is slowly making his way to you, and you
have'
    print ' to kill him to get to the alley. What course of action will you
take.'
    print
    print '1.Fight the Zombie?'
    print '2.Run Away?'
    while backyardselection < 1 or backyardselection > 2:
        print 'That is a unavailible course of action.'
        #fight zombie
    return backyardselection

#The Alley No Zombie fight here
def Alley():
    alleyselection = 0
    print 'After you killed the Zombie you begin to cautiously walk down the
alley'
    print 'looking for something to help you fend off anymore Zombies. When
you'
    print 'get near the end of the alley you find a baseball bat and a first
aid'
    print 'kit laying on the ground, You instinctifly pick up the bat and
first'
    print 'aid kit, You reach the end of the alley, and you look around for
a'
    print 'place to hide. Then you remeber about the forest beyond the
police'
    print 'station. What will you do?'
    print
    print '1.Run to the police station?'
    print '2.Run to the grocery store?'
    while alleyselection < 1 or alleyselection > 2:
        print 'Theres a group of zombies over there!!'
    return alleyselection

#fight 2 Zombies here
def police_station():
    policeselection = 0
    print 'You make your way down the street and avoid all the zombies. when
you'
    print 'reach the police station, The lights are flickering on and off.
You see'
    print 'couple people moving around on the inside. As you open the front
door'
    print 'the two zombies look at you and start heading torwards you. You
raise'
    print 'your bat and prepare to kill them. What will you do first?'
    print
    print '1.Stand your ground?'
    print '2.Run back outside the door?'
    while policeselection < 1 or policeselection > 2:
        print 'Impossible please try again'
    return policeselection
        #fight 2 zombies

#No Zombies here
def police_backdoor():
    policebackselection = 0
    print 'You look down at the two zombies you just killed and see a gun.'
    print 'You lean over and grab the gun and the ammo. Then you start to'
    print 'look around and you notice another first aid kit, You walk over'
    print 'there and patch yourself up. After your done you head towards
the'
    print 'back door. what will you do?'
    print
    print '1.Open the door?'
    print '2.Go Home?'
    while policebackselection < 1 or policebackselection > 2:
        print 'Not possible'
    return policebackselection

#last area, boss is here
def forest():
    forestselection = 0
    print 'You open the back door and you begin to walk out into the
forest.'
    print 'As your steping through the trees, you look ahead of you and you'
    print 'see someone moving slowly towards you. As you focus you see that'
    print 'its your old army buddy Jonas, You yell at him but he just keeps'
    print 'moving towards you. You begin to notice that he is also a zombie'
    print 'What will you do now?'
    print
    print '1.Draw your gun and kill Jonas?'
    print '2.Go back into the police station?'
    while forestselection < 1 or forestselection > 2:
        print 'That option will be in the expansion lol'
    return forestselection
            #Fight Boss here

#this is for the Ending
def End():
    endselection = 0
    print 'You have completed the Zombie survival game.'
    print
    print '1. End Game'
    print '2. Start Over'
    while endselection < 1 or endselection > 2:
        print 'Dont Taze me!!'
    return endselection

#this is for the start of the game
def start():
    startselection = 0
    print '      Zombie Survial 1.0.1'
    print
    print '1. Start Game
    print '2. End Game'
            #if End game put rick roll'd there
            #Survial Mode (only if i can get this finished)
    while startselection < 1 or startselection > 2:
        print 'Please enter a selection 1 or 2
        startselection = input('Press 1 to start the game')
    return startselection

#This module is for the character creation at the beginning game and
determines
#how much health you have
def character_creation():
    charselection = 0
    print '         Create your character'
    print '1. Male'
    print '2. Female'
    print '3. Be a coward and Quit'
    while charselection < 1 or charselection > 3:
        print 'Please enter a selection 1-3'
        charselection = input ('please inter gender')
    return charselection

#This module is for the monster named Zombie
def Zombie():
    ZHP = dice_roll2()
    while ZHP > 0:
    return ZHP

#This is for the Boss named Jonas
def Zombie_Boss():
    ZBHP = dice_roll4()
    while ZBHP > 0:
    return ZBHP

#specific for Zombie Boss HP
def dice_roll4():
    seed()
    dice4 = random.randrange(4, 24, 1)
    return dice4

#This Module is for 2d6 sided dice
def dice_roll2():
    seed()
    dice2 = random.randrange(2, 12, 1)
    return dice2

#This Module is for 1d6 sided dice
def dice_roll():
    seed()
    dice = random.randrange(1, 6, 1)
    return dice

#weapons = fist, gun, baseball bat
# for regular zombie
#call fight(HP, ZHP, weapon)
# for boss zombie
#call fight(HP, ZBHP, weapon, True)
def fight(HP, ZHP, weapon, boss=False):
    if weapon == 'fist':
        while HP > 0 and ZHP > 0:
            damage = 2
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2
    elif weapon == 'baseball bat':
        while HP > 0 and ZHP > 0:
            damage = dice_roll()
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2
    else weapon == 'gun':
        while HP > 0 and ZHP >0:
            damge = dice_roll2()
            ZHP = ZHP - damage
            if boss:
                HP = HP - dice_roll2()
            else:
                HP = HP - 2

#This module is used when you die
def death(HP, ZHP, ZBHP):
    if HP == 0:
        print 'You have Died.'
    elif ZHP == 0:
        print 'You have killed the Zombie.'
    elif ZBHP == 0:
        print 'Right before you kill the Zombie, he runs off.'
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From clp2 at rebertia.com  Mon Feb 23 01:58:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 22 Feb 2009 22:58:22 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <50697b2c0902222258h75b1fdeeif736260818dfd6b3@mail.gmail.com>

On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:
> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.

Please provide the full error message you're getting.

Cheers,
Chris

--
Follow the path of the Iguana...
http://rebertia.com


From kom2 at centrum.cz  Mon Feb 23 02:51:27 2009
From: kom2 at centrum.cz (Kom2)
Date: Sun, 22 Feb 2009 23:51:27 -0800 (PST)
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
Message-ID: <73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>

On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
> Kom2 wrote:
> > Hello,
> > I'm trying to convert my project from python 2.5 to python 3.0 and I
> > have the following problem. My project is PYD library written in C++.
> > So I have this PyInit_ModuleName function containing PyModule_Create
> > call and this function also call some script with declarations:
>
> > ? ?PyObject* m;
>
> > ? ?m = PyModule_Create(&PyVRDAModule);
> > ? ?if (m == NULL) {
> > ? ? ? return NULL;
> > ? ?}
> > ? ?PyObject *d, *v;
> > ? ?d = PyModule_GetDict(m);
> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> > d, NULL);
> > ? ?......
>
> > txtPyPredefinedConstants is string with this content:
>
> > class CursorMoveType:
> > ? ?First = 0
> > ? ?Last = 1
> > ? ?Next = 2
> > ? ?Previous = 3
> > ? ?Bookmark = 4
> > ? ?NewRecord = 5
>
> > In Python 2.5 everything works fine, now in python3.0
> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
> > found".
>
> > Can anybody tell mi please, what is wrong?
>
> Presumably you haven't upgraded your extension module to use the new API?
>
> ?http://wiki.python.org/moin/PortingExtensionModulesToPy3k
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Sorry, but I didn't get your point. I read the article, but I can't
see anything about running script in module Init function...


From afriere at yahoo.co.uk  Mon Feb 23 02:52:10 2009
From: afriere at yahoo.co.uk (afriere at yahoo.co.uk)
Date: Sun, 22 Feb 2009 23:52:10 -0800 (PST)
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
Message-ID: <87d8049c-a400-42f8-b2ac-8ab0bf0b4663@m24g2000vbp.googlegroups.com>

On Feb 23, 2:13?am, Torsten Mohr <tm... at s.netic.de> wrote:
> Hi,
>
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
>
> def f1(a):
> ? ? a = 7
>
> b = 3
> f1(b)
> print b
> => 3
>
> Integers are obviously passed by value, lists and dicts by reference.
>
> Is there a general rule? ?Some common formulation?
>
> Thanks for any hints,
> Torsten.

Let's add some comments and a little code

>>>def f1 (a) :
      print a, id(a)
      #print the object passed and it's id
      a = 7
      #reassign 'a' to point to a different object
      print a, id(a)
      #print the new object and it's id

>>> b = 1
>>> #make 'b' refer to object '1' residing at a particular memory location
>>> id(b)
161120104
>>> #which we might refer to as 161120104
>>> f1(b) #pass the object '1' refered to by 'b' to our function
1 161120104
7 161120032
>>> #no surprises there, the new object has a different id.
>>> id(b)
161120104
>>> #no surprises ther, b (unlike the name internal to the function
>>> #hasn't been reassigned, so it still points where it always has
>>> #which is of course ..
>>> b
1
>>> z = []
>>> #name 'z' refers to an empty list
>>> id(z)
162432780
>>> f1(z)
[] 162432780
7 161120032
>>> #no surprise that the empty list object has the same id outside
>>> #and inside the function
>>> #stranger is that the '7' object has the same id as the 7 object
>>> #created on the previous run on the function, but that is another
>>> #story


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:03:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:03:54 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak <denis.kasak at gmail.com>  
escribi?:

> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
> <steven at remove.this.cybersource.com.au> wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>>
>> Except that is wrong. If it were true, you could do this:
>>
>> def swap(x, y):
>>    y, x = x, y
>>
>> a = 1
>> b = 2
>> swap(a, b)
>> assert a == 2 and b == 1
>>
>>
>> but you can't, it does not work. Ergo, parameter passing in Python does
>> not have the same semantics as languages that use pass-by-reference,  
>> such
>> as Pascal and Basic. That means that even if you can justify the claim
>> "Python is pass-by-reference" by some technical argument (and I don't
>> believe you can), it is misleading to make that claim without further
>> qualifications.
>
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable.

That's irrelevant - mutable and immutable objects are passed exactly the  
same way.

> The objects *do* get passed by
> reference; the function doesn't receive a new copy of the object and
> it can examine the original object's ID. The actual culprit is not the
> way objects are passed but the assignment operator, since it works by
> rebinding names (as Andrew Koenig explained) and not by changing the
> object itself.

There is *no* difference between "the way objects are passed" and "the  
assignment opera[tion]": both work exactly the same way.

Python execution model is based on namespaces (a collection of  
name->object pairs, usually implemented as dictionaries). An assignment x  
= y means:

  - evaluate the right hand side and obtain a value (an object, always). In  
this case, it is the object referenced by the name "y"
  - make the name "x" refer to such object. That's all.

In short, assignment rebinds a name in a namespace.
When a function call is made, a new namespace is created. The names come  
 from the function parameters (the names that were used to define the  
function in the def ... line) and the objects come from the actual  
arguments (the objects you pass inside the (...) when doing the call). The  
function code is then executed using this namespace as its locals().

def foo(a, b):
   print a, b

foo(4, ['hello', 'world!'])

The call is equivalent to:
   ns = {}
   ns['a'], ns['b'] = 4, ['hello', 'world!']
   execute foo code using ns as locals

except the right hand side is evaluated on the *calling* namespace, and  
the left hand assignments are done on the new namespace. So a call binds  
many names in a new namespace: the same as assignment.

No copies, no pointers, nothing: only names and objects are manipulated.

> If the swap() function could somehow access the
> underlying integer object and modify it, swapping of values would
> indeed occur because the function *did* get references to the objects
> passed to it.

There is a difference between modify the value of an object, and modify  
the caller's namespace. Usually "pass by reference" means that the  
*caller* may see a different thing after the call - this is not true in  
Python, there is no way the called code could alter the caller namespace  
(well, not just due to the call operation alone...)

> That said, it's a rather convoluted way of explaining what happens and
> calling it pass-by-object feels much better. :-)

And is more correct...

-- 
Gabriel Genellina



From neoedmund at gmail.com  Mon Feb 23 03:06:58 2009
From: neoedmund at gmail.com (neoedmund)
Date: Mon, 23 Feb 2009 00:06:58 -0800 (PST)
Subject: confusing UnboundLocalError behaive
Message-ID: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>

see the 3 small piece of code, i cannot understand why it result as
this.

1.
def test():
	abc="111"
	def m1():
		print(abc)
	m1()
test()

Output: 111

2.
def test():
	abc="111"
	def m1():
		print(abc)
		abc+="222"
	m1()
test()

Output:
   print(abc)
UnboundLocalError: local variable 'abc' referenced before assignment

3.
def test2():
	abc=[111]
	def m1():
		print(abc)
		abc.append(222)
	m1()
	print(abc)
test2()

Output:
[111]
[111,222]

it seems "you cannot change the outter scope values but can use it
readonly."


From sternbrightblade at gmail.com  Mon Feb 23 03:08:45 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 00:08:45 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>

The full error message says "There's an error in your program: *** 'return'
outside function (final(2).py, line 114)
 which is were this return statement is..

    while introselection < 1 or introselection > 2:
        print 'That area is unavaible please buy the expansion haha'
    return introselection
On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:

> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.
>
> #This is a Text based RPG
> # HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss
> Hit Points
> def fakemain(): #This is a place holder for me untill im ready to run the
> program
> start()
>     startselection = start()
>     if startselection == 1:
>         character_creation()
>     else:
>         #end game (need the code to exit program)
>
>     charselection = character_creation()
>     if charselection == 1:
>         name = raw_input ('Please Enter Your Name')
>         HP = dice_roll2()
>         print 'Your HP is ',HP
>     elif charselection == 2:
>         name = raw_input ('Please Enter Your Name')
>         HP = dice_roll()
>         print 'Your HP is ',HP
>     else:
>
> intro_area()
>     introselection = intro_area()
>     if introselection == 1:
>         print 'A Zombie Attacks you'
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         intro_area()
>     else:
>         back_yard()
>     backyardselection = back_yard()
>     if backyardselection == 1:
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     else:
>         print 'The Zombie leaps and reaches you before you shut the door.'
>         print 'YOU HAVE DIED!!!'
>             #reset the game (need the code to reset program)
>
> Alley()
>     alleyselection = Alley()
>     if alleyselection == 1:
>         police_station()
>     else:   #The object here is for the person to die if they select option
> 2
>         print 'As you try to get something to munch on 5 zombies attack
> you'
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     policeselection = police_station()
>     if policeselection == 1:
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>         fight(HP, ZHP, weapon)
>         death(HP, ZHP, ZBHP)
>     else:
>         print 'The door mysteriously locked itself'
>         police_station()
> police_backdoor()
>     policebackselection = police_backdoor()
>     if policebackselection == 1:
>         forest()
>     else:
>         print 'The Front Door is locked only way out is the backdoor'
>         police_backdoor()
>
>     forestselection = forest()
>     if forestselection == 1:
>         fight(HP, ZBHP, weapon, True)
>         death(HP, ZHP, ZBHP)
>         end()
>     else:
>         print 'Jonas reaches you before you get back and eats your brains'
>         #End game
>     endselection = end()
>     if endselection == 1:
>         #End program or play rick roll'd haha
>     else:
>         #reset program
>
>
> #This mod is the first area you are in
> def intro_area():
>     introselection = 0
>     print ' Welcome to Zombie Survival'
>     print ' It is a quite night in Egad, Wisconsin when..You suddenly
> awake'
>     print ' to the sounds from outside. You see sparks outside from your
> window.'
>     print ' The phone line has been cut. You have nothing to help you fend'
>     print ' of attackers. What will you do!!!'
>     print
>     print '1. Open the Front door?'
>     print '2. Go out the back door and towards the alley?'
>     while introselection < 1 or introselection > 2
>         print 'That area is unavaible please buy the expansion haha'
>     return introselection
>
> #This is the second area of the RPG
> def back_yard():
>     backyardselection = 0
>     print ' As you make your way out the back door, a Zombie appears from
> the'
>     print ' side of the yard. He is slowly making his way to you, and you
> have'
>     print ' to kill him to get to the alley. What course of action will you
> take.'
>     print
>     print '1.Fight the Zombie?'
>     print '2.Run Away?'
>     while backyardselection < 1 or backyardselection > 2:
>         print 'That is a unavailible course of action.'
>         #fight zombie
>     return backyardselection
>
> #The Alley No Zombie fight here
> def Alley():
>     alleyselection = 0
>     print 'After you killed the Zombie you begin to cautiously walk down
> the alley'
>     print 'looking for something to help you fend off anymore Zombies. When
> you'
>     print 'get near the end of the alley you find a baseball bat and a
> first aid'
>     print 'kit laying on the ground, You instinctifly pick up the bat and
> first'
>     print 'aid kit, You reach the end of the alley, and you look around for
> a'
>     print 'place to hide. Then you remeber about the forest beyond the
> police'
>     print 'station. What will you do?'
>     print
>     print '1.Run to the police station?'
>     print '2.Run to the grocery store?'
>     while alleyselection < 1 or alleyselection > 2:
>         print 'Theres a group of zombies over there!!'
>     return alleyselection
>
> #fight 2 Zombies here
> def police_station():
>     policeselection = 0
>     print 'You make your way down the street and avoid all the zombies.
> when you'
>     print 'reach the police station, The lights are flickering on and off.
> You see'
>     print 'couple people moving around on the inside. As you open the front
> door'
>     print 'the two zombies look at you and start heading torwards you. You
> raise'
>     print 'your bat and prepare to kill them. What will you do first?'
>     print
>     print '1.Stand your ground?'
>     print '2.Run back outside the door?'
>     while policeselection < 1 or policeselection > 2:
>         print 'Impossible please try again'
>     return policeselection
>         #fight 2 zombies
>
> #No Zombies here
> def police_backdoor():
>     policebackselection = 0
>     print 'You look down at the two zombies you just killed and see a gun.'
>     print 'You lean over and grab the gun and the ammo. Then you start to'
>     print 'look around and you notice another first aid kit, You walk over'
>     print 'there and patch yourself up. After your done you head towards
> the'
>     print 'back door. what will you do?'
>     print
>     print '1.Open the door?'
>     print '2.Go Home?'
>     while policebackselection < 1 or policebackselection > 2:
>         print 'Not possible'
>     return policebackselection
>
> #last area, boss is here
> def forest():
>     forestselection = 0
>     print 'You open the back door and you begin to walk out into the
> forest.'
>     print 'As your steping through the trees, you look ahead of you and
> you'
>     print 'see someone moving slowly towards you. As you focus you see
> that'
>     print 'its your old army buddy Jonas, You yell at him but he just
> keeps'
>     print 'moving towards you. You begin to notice that he is also a
> zombie'
>     print 'What will you do now?'
>     print
>     print '1.Draw your gun and kill Jonas?'
>     print '2.Go back into the police station?'
>     while forestselection < 1 or forestselection > 2:
>         print 'That option will be in the expansion lol'
>     return forestselection
>             #Fight Boss here
>
> #this is for the Ending
> def End():
>     endselection = 0
>     print 'You have completed the Zombie survival game.'
>     print
>     print '1. End Game'
>     print '2. Start Over'
>     while endselection < 1 or endselection > 2:
>         print 'Dont Taze me!!'
>     return endselection
>
> #this is for the start of the game
> def start():
>     startselection = 0
>     print '      Zombie Survial 1.0.1'
>     print
>     print '1. Start Game
>     print '2. End Game'
>             #if End game put rick roll'd there
>             #Survial Mode (only if i can get this finished)
>     while startselection < 1 or startselection > 2:
>         print 'Please enter a selection 1 or 2
>         startselection = input('Press 1 to start the game')
>     return startselection
>
> #This module is for the character creation at the beginning game and
> determines
> #how much health you have
> def character_creation():
>     charselection = 0
>     print '         Create your character'
>     print '1. Male'
>     print '2. Female'
>     print '3. Be a coward and Quit'
>     while charselection < 1 or charselection > 3:
>         print 'Please enter a selection 1-3'
>         charselection = input ('please inter gender')
>     return charselection
>
> #This module is for the monster named Zombie
> def Zombie():
>     ZHP = dice_roll2()
>     while ZHP > 0:
>     return ZHP
>
> #This is for the Boss named Jonas
> def Zombie_Boss():
>     ZBHP = dice_roll4()
>     while ZBHP > 0:
>     return ZBHP
>
> #specific for Zombie Boss HP
> def dice_roll4():
>     seed()
>     dice4 = random.randrange(4, 24, 1)
>     return dice4
>
> #This Module is for 2d6 sided dice
> def dice_roll2():
>     seed()
>     dice2 = random.randrange(2, 12, 1)
>     return dice2
>
> #This Module is for 1d6 sided dice
> def dice_roll():
>     seed()
>     dice = random.randrange(1, 6, 1)
>     return dice
>
> #weapons = fist, gun, baseball bat
> # for regular zombie
> #call fight(HP, ZHP, weapon)
> # for boss zombie
> #call fight(HP, ZBHP, weapon, True)
> def fight(HP, ZHP, weapon, boss=False):
>     if weapon == 'fist':
>         while HP > 0 and ZHP > 0:
>             damage = 2
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     elif weapon == 'baseball bat':
>         while HP > 0 and ZHP > 0:
>             damage = dice_roll()
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     else weapon == 'gun':
>         while HP > 0 and ZHP >0:
>             damge = dice_roll2()
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>
> #This module is used when you die
> def death(HP, ZHP, ZBHP):
>     if HP == 0:
>         print 'You have Died.'
>     elif ZHP == 0:
>         print 'You have killed the Zombie.'
>     elif ZBHP == 0:
>         print 'Right before you kill the Zombie, he runs off.'
>
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From Ron.Barak at lsi.com  Mon Feb 23 03:09:44 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 08:09:44 +0000
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>



> -----Original Message-----
> From: chris at rebertia.com [mailto:chris at rebertia.com] On
> Behalf Of Chris Rebert
> Sent: Sunday, February 22, 2009 22:12
> To: Barak, Ron
> Cc: python-list at python.org
> Subject: Re: Is there a way to ask a class what its metaclasses are ?
>
> On Sun, Feb 22, 2009 at 5:14 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> > Hi Chris,
> <snip
> > Is there a way to ask a class what its metaclasses are ?
> > (e.g., how to ask wx.Frame what it's metaclass is)
>
> Of course. A metaclass is the type of a class, so it's just
> type(wx.Frame).
>
> Cheers,
> Chris

Thanks Chris.
When I try the following (to see the types of the classes involved):

#!/usr/bin/env python

import wx
from Debug import _line as line

class CopyAndPaste(object):
    def __init__(self, *args, **kwargs):
        super(CopyAndPaste, self).__init__(*args, **kwargs)
        print line()+". type(wx.Frame):",type(wx.Frame)
        print line()+". type(object):",type(object)

I get:

$ python -u CopyAndPaste.py
9. type(wx.Frame): <type 'type'>
10. type(object): <type 'type'>

And I don't understand what it means...
In any case, it does not seem to help me resolve the metaclasses exception.

Bye,
Ron.

>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
> >
> > I'm asking, because, even subclassing from object, viz.:
> >
> > class CopyAndPaste(object):
> >     def __init__(self):
> >         pass
> > ...
> >
> > Still gives me:
> >
> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
> > last):
> >   File "./failover_pickle_demo09.py", line 321, in <module>
> >     class ListControlMeta(wx.Frame, CopyAndPaste):
> > TypeError: Error when calling the metaclass bases
> >     metaclass conflict: the metaclass of a derived class must be a
> > (non-strict) subclass of the metaclasses of all its bases
> >
> > Bye,
> > Ron.
>
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From alwaseem307ster at yahoo.com  Mon Feb 23 03:17:41 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 00:17:41 -0800 (PST)
Subject: pysqlite smart search
Message-ID: <22157116.post@talk.nabble.com>


 Hey guys;

I am trying to develop a tiny program using python to search inside sqlite
database with file extension is .db in which the program will ask users to
enter their search query and base on that it will retrieve the results But

I need the program to have some smartness in search mechanism in which the
program will guess that the user is looking for these key words in the
database.

so far i came up with this but the search ain't smart, i have to write the
full key word in order to retrieve specific information.

from pysqlite2 import dbapi2 as sqlite3

connection = sqlite3.connect('Photos.db')
memoryConnection = sqlite3.connect(':memory:')
cursor = connection.cursor()
prompt = 'Enter your search query?\n'
keyword = raw_input(prompt)
if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
print cursor.fetchall()
else:
cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
print cursor.fetchall()

Any ideas and
thanks in advance
Reply
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22157116.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From clp2 at rebertia.com  Mon Feb 23 03:21:35 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 00:21:35 -0800
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
Message-ID: <50697b2c0902230021v6a52db2eoc2218cf7bf835995@mail.gmail.com>

Ok, that's not a standard Python error report (I'm guessing you're
using an IDE of some sort).
Also, something's not right because your excerpt doesn't match the
source you posted.
In your previous post, the 'while' line in question was given as:

while introselection < 1 or introselection > 2

Note the missing semicolon. Whereas in your last message, you show it
with the semicolon.
Try running your program from the command line with Python and check
what error message it gives.
And ensure you give the /exact/ source if you have further questions.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


On Mon, Feb 23, 2009 at 12:08 AM, Tony <sternbrightblade at gmail.com> wrote:
> The full error message says "There's an error in your program: *** 'return'
> outside function (final(2).py, line 114)
>  which is were this return statement is..
>     while introselection < 1 or introselection > 2:
>         print 'That area is unavaible please buy the expansion haha'
>     return introselection
> On Sun, Feb 22, 2009 at 10:51 PM, Tony <sternbrightblade at gmail.com> wrote:
>>
>> Hi,
>> I am trying to write a small program for my final for school, everytime i
>> run my program it gives me a return outside function error (after i fixed
>> all the indentation errors it throws at me), i am not very good at
>> programing with python atm, so any help would be appreiciated. and if im
>> missing somethign please feel free to throw
>> any suggestions out there.
>>
>> #This is a Text based RPG
>> # HP = Character hit points, ZHP = Zombie Hit points, ZBHP = Zombie Boss
>> Hit Points
>> def fakemain(): #This is a place holder for me untill im ready to run the
>> program
>> start()
>>     startselection = start()
>>     if startselection == 1:
>>         character_creation()
>>     else:
>>         #end game (need the code to exit program)
>>
>>     charselection = character_creation()
>>     if charselection == 1:
>>         name = raw_input ('Please Enter Your Name')
>>         HP = dice_roll2()
>>         print 'Your HP is ',HP
>>     elif charselection == 2:
>>         name = raw_input ('Please Enter Your Name')
>>         HP = dice_roll()
>>         print 'Your HP is ',HP
>>     else:
>>
>> intro_area()
>>     introselection = intro_area()
>>     if introselection == 1:
>>         print 'A Zombie Attacks you'
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         intro_area()
>>     else:
>>         back_yard()
>>     backyardselection = back_yard()
>>     if backyardselection == 1:
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     else:
>>         print 'The Zombie leaps and reaches you before you shut the door.'
>>         print 'YOU HAVE DIED!!!'
>>             #reset the game (need the code to reset program)
>>
>> Alley()
>>     alleyselection = Alley()
>>     if alleyselection == 1:
>>         police_station()
>>     else:   #The object here is for the person to die if they select
>> option 2
>>         print 'As you try to get something to munch on 5 zombies attack
>> you'
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     policeselection = police_station()
>>     if policeselection == 1:
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>         fight(HP, ZHP, weapon)
>>         death(HP, ZHP, ZBHP)
>>     else:
>>         print 'The door mysteriously locked itself'
>>         police_station()
>> police_backdoor()
>>     policebackselection = police_backdoor()
>>     if policebackselection == 1:
>>         forest()
>>     else:
>>         print 'The Front Door is locked only way out is the backdoor'
>>         police_backdoor()
>>     forestselection = forest()
>>     if forestselection == 1:
>>         fight(HP, ZBHP, weapon, True)
>>         death(HP, ZHP, ZBHP)
>>         end()
>>     else:
>>         print 'Jonas reaches you before you get back and eats your brains'
>>         #End game
>>     endselection = end()
>>     if endselection == 1:
>>         #End program or play rick roll'd haha
>>     else:
>>         #reset program
>>
>> #This mod is the first area you are in
>> def intro_area():
>>     introselection = 0
>>     print ' Welcome to Zombie Survival'
>>     print ' It is a quite night in Egad, Wisconsin when..You suddenly
>> awake'
>>     print ' to the sounds from outside. You see sparks outside from your
>> window.'
>>     print ' The phone line has been cut. You have nothing to help you
>> fend'
>>     print ' of attackers. What will you do!!!'
>>     print
>>     print '1. Open the Front door?'
>>     print '2. Go out the back door and towards the alley?'
>>     while introselection < 1 or introselection > 2
>>         print 'That area is unavaible please buy the expansion haha'
>>     return introselection
>>
>> #This is the second area of the RPG
>> def back_yard():
>>     backyardselection = 0
>>     print ' As you make your way out the back door, a Zombie appears from
>> the'
>>     print ' side of the yard. He is slowly making his way to you, and you
>> have'
>>     print ' to kill him to get to the alley. What course of action will
>> you take.'
>>     print
>>     print '1.Fight the Zombie?'
>>     print '2.Run Away?'
>>     while backyardselection < 1 or backyardselection > 2:
>>         print 'That is a unavailible course of action.'
>>         #fight zombie
>>     return backyardselection
>>
>> #The Alley No Zombie fight here
>> def Alley():
>>     alleyselection = 0
>>     print 'After you killed the Zombie you begin to cautiously walk down
>> the alley'
>>     print 'looking for something to help you fend off anymore Zombies.
>> When you'
>>     print 'get near the end of the alley you find a baseball bat and a
>> first aid'
>>     print 'kit laying on the ground, You instinctifly pick up the bat and
>> first'
>>     print 'aid kit, You reach the end of the alley, and you look around
>> for a'
>>     print 'place to hide. Then you remeber about the forest beyond the
>> police'
>>     print 'station. What will you do?'
>>     print
>>     print '1.Run to the police station?'
>>     print '2.Run to the grocery store?'
>>     while alleyselection < 1 or alleyselection > 2:
>>         print 'Theres a group of zombies over there!!'
>>     return alleyselection
>>
>> #fight 2 Zombies here
>> def police_station():
>>     policeselection = 0
>>     print 'You make your way down the street and avoid all the zombies.
>> when you'
>>     print 'reach the police station, The lights are flickering on and off.
>> You see'
>>     print 'couple people moving around on the inside. As you open the
>> front door'
>>     print 'the two zombies look at you and start heading torwards you. You
>> raise'
>>     print 'your bat and prepare to kill them. What will you do first?'
>>     print
>>     print '1.Stand your ground?'
>>     print '2.Run back outside the door?'
>>     while policeselection < 1 or policeselection > 2:
>>         print 'Impossible please try again'
>>     return policeselection
>>         #fight 2 zombies
>>
>> #No Zombies here
>> def police_backdoor():
>>     policebackselection = 0
>>     print 'You look down at the two zombies you just killed and see a
>> gun.'
>>     print 'You lean over and grab the gun and the ammo. Then you start to'
>>     print 'look around and you notice another first aid kit, You walk
>> over'
>>     print 'there and patch yourself up. After your done you head towards
>> the'
>>     print 'back door. what will you do?'
>>     print
>>     print '1.Open the door?'
>>     print '2.Go Home?'
>>     while policebackselection < 1 or policebackselection > 2:
>>         print 'Not possible'
>>     return policebackselection
>>
>> #last area, boss is here
>> def forest():
>>     forestselection = 0
>>     print 'You open the back door and you begin to walk out into the
>> forest.'
>>     print 'As your steping through the trees, you look ahead of you and
>> you'
>>     print 'see someone moving slowly towards you. As you focus you see
>> that'
>>     print 'its your old army buddy Jonas, You yell at him but he just
>> keeps'
>>     print 'moving towards you. You begin to notice that he is also a
>> zombie'
>>     print 'What will you do now?'
>>     print
>>     print '1.Draw your gun and kill Jonas?'
>>     print '2.Go back into the police station?'
>>     while forestselection < 1 or forestselection > 2:
>>         print 'That option will be in the expansion lol'
>>     return forestselection
>>             #Fight Boss here
>> #this is for the Ending
>> def End():
>>     endselection = 0
>>     print 'You have completed the Zombie survival game.'
>>     print
>>     print '1. End Game'
>>     print '2. Start Over'
>>     while endselection < 1 or endselection > 2:
>>         print 'Dont Taze me!!'
>>     return endselection
>>
>> #this is for the start of the game
>> def start():
>>     startselection = 0
>>     print '      Zombie Survial 1.0.1'
>>     print
>>     print '1. Start Game
>>     print '2. End Game'
>>             #if End game put rick roll'd there
>>             #Survial Mode (only if i can get this finished)
>>     while startselection < 1 or startselection > 2:
>>         print 'Please enter a selection 1 or 2
>>         startselection = input('Press 1 to start the game')
>>     return startselection
>>
>> #This module is for the character creation at the beginning game and
>> determines
>> #how much health you have
>> def character_creation():
>>     charselection = 0
>>     print '         Create your character'
>>     print '1. Male'
>>     print '2. Female'
>>     print '3. Be a coward and Quit'
>>     while charselection < 1 or charselection > 3:
>>         print 'Please enter a selection 1-3'
>>         charselection = input ('please inter gender')
>>     return charselection
>>
>> #This module is for the monster named Zombie
>> def Zombie():
>>     ZHP = dice_roll2()
>>     while ZHP > 0:
>>     return ZHP
>>
>> #This is for the Boss named Jonas
>> def Zombie_Boss():
>>     ZBHP = dice_roll4()
>>     while ZBHP > 0:
>>     return ZBHP
>>
>> #specific for Zombie Boss HP
>> def dice_roll4():
>>     seed()
>>     dice4 = random.randrange(4, 24, 1)
>>     return dice4
>>
>> #This Module is for 2d6 sided dice
>> def dice_roll2():
>>     seed()
>>     dice2 = random.randrange(2, 12, 1)
>>     return dice2
>>
>> #This Module is for 1d6 sided dice
>> def dice_roll():
>>     seed()
>>     dice = random.randrange(1, 6, 1)
>>     return dice
>>
>> #weapons = fist, gun, baseball bat
>> # for regular zombie
>> #call fight(HP, ZHP, weapon)
>> # for boss zombie
>> #call fight(HP, ZBHP, weapon, True)
>> def fight(HP, ZHP, weapon, boss=False):
>>     if weapon == 'fist':
>>         while HP > 0 and ZHP > 0:
>>             damage = 2
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>     elif weapon == 'baseball bat':
>>         while HP > 0 and ZHP > 0:
>>             damage = dice_roll()
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>     else weapon == 'gun':
>>         while HP > 0 and ZHP >0:
>>             damge = dice_roll2()
>>             ZHP = ZHP - damage
>>             if boss:
>>                 HP = HP - dice_roll2()
>>             else:
>>                 HP = HP - 2
>>
>> #This module is used when you die
>> def death(HP, ZHP, ZBHP):
>>     if HP == 0:
>>         print 'You have Died.'
>>     elif ZHP == 0:
>>         print 'You have killed the Zombie.'
>>     elif ZBHP == 0:
>>         print 'Right before you kill the Zombie, he runs off.'
>
> --
> http://mail.python.org/mailman/listinfo/python-list


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:23:25 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:23:25 -0200
Subject: different errors, return outside function and others
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
Message-ID: <op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 04:51:39 -0200, Tony <sternbrightblade at gmail.com>  
escribi?:

> Hi,
> I am trying to write a small program for my final for school, everytime i
> run my program it gives me a return outside function error (after i fixed
> all the indentation errors it throws at me), i am not very good at
> programing with python atm, so any help would be appreiciated. and if im
> missing somethign please feel free to throw
> any suggestions out there.

Is this your *actual* code? It does not even compile...
Things like 'def foo(...):' are *functions*, not *modules*.

Variables inside functions (including its arguments) are locals, private  
to the function. Even if you modify them, the "outside world" doesn't  
notice. So a function like this:

> def fight(HP, ZHP, weapon, boss=False):
>     if weapon == 'fist':
>         while HP > 0 and ZHP > 0:
>             damage = 2
>             ZHP = ZHP - damage
>             if boss:
>                 HP = HP - dice_roll2()
>             else:
>                 HP = HP - 2
>     elif weapon == 'baseball bat':
           [... more code ...]

won't alter the "global" values HP, ZHP; in fact, it won't do nothing.

Either return the new values:
    return HP, ZHP
and also adjust everywhere you call:
    HP, ZHP = fight(HP, ZHP, ...)

Or mark HP, ZHP as globals (using the global statement).

-- 
Gabriel Genellina



From clp2 at rebertia.com  Mon Feb 23 03:26:17 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 00:26:17 -0800
Subject: confusing UnboundLocalError behaive
In-Reply-To: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <50697b2c0902230026v7f3826adq6472412dc892ba03@mail.gmail.com>

On Mon, Feb 23, 2009 at 12:06 AM, neoedmund <neoedmund at gmail.com> wrote:
> see the 3 small piece of code, i cannot understand why it result as
> this.
>
> 1.
> def test():
>        abc="111"
>        def m1():
>                print(abc)
>        m1()
> test()
>
> Output: 111
>
> 2.
> def test():
>        abc="111"
>        def m1():

You need a 'nonlocal' declaration here (requires Python 3.0 I think).
See PEP 3104 for more info -- http://www.python.org/dev/peps/pep-3104/

>                print(abc)
>                abc+="222"
>        m1()
> test()
>
> Output:
>   print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment
>
> 3.
> def test2():
>        abc=[111]
>        def m1():
>                print(abc)
>                abc.append(222)
>        m1()
>        print(abc)
> test2()
>
> Output:
> [111]
> [111,222]
>
> it seems "you cannot change the outter scope values but can use it
> readonly."

Yeah, that's basically how nested scopes (sans 'nonlocal') work in
Python, since assignment typically constitutes an implicit scope
declaration.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 03:47:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 06:47:13 -0200
Subject: confusing UnboundLocalError behaive
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <op.upsqozbwx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:06:58 -0200, neoedmund <neoedmund at gmail.com>  
escribi?:

> it seems "you cannot change the outter scope values but can use it
> readonly."

Exactly.
Python doesn't have variable "declarations" - so the compiler uses this  
rule: "if the variable is assigned to, anywhere in the function body, it's  
local". This is done by static analysis when the code is compiled.

> 2.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 		abc+="222"
> 	m1()
> test()
>
> Output:
>    print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment

abc is assigned to, so it is local (and different from the abc in its  
enclosing scope). You can't print abc until it is assigned "something".

> 3.
> def test2():
> 	abc=[111]
> 	def m1():
> 		print(abc)
> 		abc.append(222)
> 	m1()
> 	print(abc)

No assignment to abc, so it's not local; print(abc) starts looking for it  
in all the enclosing scopes (up to the module global scope, and last, the  
builtin module).

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 04:02:46 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Feb 2009 09:02:46 GMT
Subject: confusing UnboundLocalError behaive
References: <7eb57b3d-de83-4e1b-a7c1-048064c511bb@o11g2000yql.googlegroups.com>
Message-ID: <pan.2009.02.23.09.02.46@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 00:06:58 -0800, neoedmund wrote:

> see the 3 small piece of code, i cannot understand why it result as
> this.
> 
> 1.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 	m1()
> test()
> 
> Output: 111

abc is local to test(). print(abc) looks for a local abc, can't find one, 
and so searches the higher scope, and finds it there.



> 2.
> def test():
> 	abc="111"
> 	def m1():
> 		print(abc)
> 		abc+="222"
> 	m1()
> test()
> 
> Output:
>    print(abc)
> UnboundLocalError: local variable 'abc' referenced before assignment


Because you make an assignment to abc inside the m1() function, but 
didn't declare it as global, Python assumes that it must be a local 
variable. So when you try to print it, it doesn't have a value yet.

Solution: don't do that, or use the statement nonlocal (like global, 
except I think it is only introduced in Python 3.0).

 
> 3.
> def test2():
> 	abc=[111]
> 	def m1():
> 		print(abc)
> 		abc.append(222)
> 	m1()
> 	print(abc)
> test2()
> 
> Output:
> [111]
> [111,222]
> 
> it seems "you cannot change the outter scope values but can use it
> readonly."

But you're not using it read-only, because the append worked.

What you can't do is assign to the name.


Have a look at the disassembled code:

>>> import dis
>>> def spam():
...     print x
...     y = x+1
...
>>> dis.dis(spam)
  2           0 LOAD_GLOBAL              0 (x)
              3 PRINT_ITEM
              4 PRINT_NEWLINE

  3           5 LOAD_GLOBAL              0 (x)
              8 LOAD_CONST               1 (1)
             11 BINARY_ADD
             12 STORE_FAST               0 (y)
             15 LOAD_CONST               0 (None)
             18 RETURN_VALUE
>>>
>>> def ham():
...     print x
...     x = x+1
...
>>> dis.dis(ham)
  2           0 LOAD_FAST                0 (x)
              3 PRINT_ITEM
              4 PRINT_NEWLINE

  3           5 LOAD_FAST                0 (x)
              8 LOAD_CONST               1 (1)
             11 BINARY_ADD
             12 STORE_FAST               0 (x)
             15 LOAD_CONST               0 (None)
             18 RETURN_VALUE



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:07:38 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:07:38 -0200
Subject: pysqlite smart search
References: <22157116.post@talk.nabble.com>
Message-ID: <op.upsrm0zsx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:17:41 -0200, klia <alwaseem307ster at yahoo.com>  
escribi?:

> I need the program to have some smartness in search mechanism in which  
> the
> program will guess that the user is looking for these key words in the
> database.
>
> so far i came up with this but the search ain't smart, i have to write  
> the
> full key word in order to retrieve specific information.
>
> from pysqlite2 import dbapi2 as sqlite3
>
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()

That's pretty good. SQL wildcard is '%' so try using '... where Tag like  
?', ('%'+keyword+'%',)
Also, the return value of cursor.execute is undefined in PEP249, and  
fetchall is a connection method, not cursor's. (Although this may work  
with SQLite, if you later decide to switch to another database it would be  
inconvenient).

cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?', ('%'+keyword+'%',))
rows = cursor.fetchall()
if not rows:
   cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', (keyword,))
   rows = cursor.fetchall()
print rows

-- 
Gabriel Genellina



From sternbrightblade at gmail.com  Mon Feb 23 04:07:57 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 01:07:57 -0800
Subject: different errors, return outside function and others
In-Reply-To: <op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>

ok thank you for that input, this is my first class in programming and its
the only one the school offers. im pretty sure those are supposed to be
modules
that im writting. would it make a difference if those were modules and not
functions? kinda stupid question there but im trying to learn as much as
possible.
Also anything with def infront of it example def start(): would be a
function correct? also im Using 2.5 and the IDLE to do this

On Mon, Feb 23, 2009 at 12:23 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 23 Feb 2009 04:51:39 -0200, Tony <sternbrightblade at gmail.com>
> escribi?:
>
> Hi,
>> I am trying to write a small program for my final for school, everytime i
>> run my program it gives me a return outside function error (after i fixed
>> all the indentation errors it throws at me), i am not very good at
>> programing with python atm, so any help would be appreiciated. and if im
>> missing somethign please feel free to throw
>> any suggestions out there.
>>
>
> Is this your *actual* code? It does not even compile...
> Things like 'def foo(...):' are *functions*, not *modules*.
>
> Variables inside functions (including its arguments) are locals, private to
> the function. Even if you modify them, the "outside world" doesn't notice.
> So a function like this:
>
> def fight(HP, ZHP, weapon, boss=False):
>>    if weapon == 'fist':
>>        while HP > 0 and ZHP > 0:
>>            damage = 2
>>            ZHP = ZHP - damage
>>            if boss:
>>                HP = HP - dice_roll2()
>>            else:
>>                HP = HP - 2
>>    elif weapon == 'baseball bat':
>>
>          [... more code ...]
>
> won't alter the "global" values HP, ZHP; in fact, it won't do nothing.
>
> Either return the new values:
>   return HP, ZHP
> and also adjust everywhere you call:
>   HP, ZHP = fight(HP, ZHP, ...)
>
> Or mark HP, ZHP as globals (using the global statement).
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:21:53 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:21:53 -0200
Subject: Is there a way to ask a class what its metaclasses are ?
References: <mailman.36.1235041220.11040.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>
	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>
	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>
	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>
	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
Message-ID: <op.upssarxhx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 06:09:44 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

>> > I'm asking, because, even subclassing from object, viz.:
>> >
>> > class CopyAndPaste(object):
>> >     def __init__(self):
>> >         pass
>> > ...
>> >
>> > Still gives me:
>> >
>> > $ python -u ./failover_pickle_demo09.py Traceback (most recent call
>> > last):
>> >   File "./failover_pickle_demo09.py", line 321, in <module>
>> >     class ListControlMeta(wx.Frame, CopyAndPaste):
>> > TypeError: Error when calling the metaclass bases
>> >     metaclass conflict: the metaclass of a derived class must be a
>> > (non-strict) subclass of the metaclasses of all its bases

This works fine for me with Python 2.5 and wx 2.8.7.1; Python 2.4 and wx  
2.6.1.0; even if CopyAndPaste is an old-style class.

<code>
import wx

class CopyAndPaste(object):
   pass

class ListControl(wx.Frame, CopyAndPaste):
   pass

app = wx.App()
frame = ListControl(None)
frame.Show(True)
app.MainLoop()
</code>

You'll have to provide more info on your setup...

-- 
Gabriel Genellina



From nick at craig-wood.com  Mon Feb 23 04:32:00 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 23 Feb 2009 03:32:00 -0600
Subject: can multi-core improve single funciton?
References: <6a4f17690902092228i31fd1661n41c61c4037a289df@mail.gmail.com>
	<mailman.9205.1234248235.3487.python-list@python.org>
	<d64b1fe6-1b6e-48e2-86d3-c802fe8d40cd@o11g2000yql.googlegroups.com>
	<64c334d7-434f-4ec3-8ccb-35e8088a0cb2@u13g2000yqg.googlegroups.com>
Message-ID: <slrngq4p5m.79l.nick@irishsea.home.craig-wood.com>

sturlamolden <sturlamolden at yahoo.no> wrote:
>  On Feb 10, 8:38?am, Paul McGuire <pt... at austin.rr.com> wrote:
> 
> > Even worse than linear, the function is recursive, which as I
> > understand it, is inherently a no-no when looking for code that is
> > parallel-friendly.
> 
>  There is no way to parallelize Fibonacci numbers computed with linear
>  time complexity, as we must know fib(n-1) to compute fib(n). But if we
>  were to use Oyster's recursive version, which has geometric
>  complexity, one could parallelize with a 'forkjoin' scheme.
> 
>  Anyhow, this runs in amortized linear time and would be a lot faster:
> 
>  def fib(n):
>     while True:
>        try:
>           return fib.seq[n]
>        except AttributeError:
>           fib.seq = [0, 1, 1]
>        except IndexError:
>           fib.seq.append( fib.seq[-2] +
>                            fib.seq[-1] )

Or something which runs in O(1)...

from gmpy import mpf, mpz, digits
from math import log, sqrt

root5_float = sqrt(5)
phi_float = (1 + root5_float) / 2
log_phi_float = log(phi_float)
log_root5_float = log(root5_float)
log2 = log(2)

def fibonacci_noniterative(n):
    """
    Work out n'th Fibonacci number in an noniterative fashion using Binet's formula
    """
    # Work out magnitude of answer
    bits = int(((n * log_phi_float - log_root5_float) / log2)*1.1)
    if bits < 0:
        bits = 0
    root5 = mpf(5, bits).sqrt()
    phi = (mpf(1, bits) + root5) / mpf(2, bits)
    f_n = phi**n / root5
    f_n = mpz(f_n + mpf(1, bits) / mpf(2, bits))
    return long(f_n)

It runs in O(1) if the O we are talking about is large integer
arithmetic.  It actually runs in more like O(log(n)**1.5) time.  It is
a lot faster than the iterative approach too which runs in
O(log(n)**2) for any n > ~40.

Times to calculate F(n)

         n,  iterative, noniterative
         1,   0.000003,   0.000016
         2,   0.000003,   0.000014
         4,   0.000003,   0.000012
         8,   0.000003,   0.000016
        16,   0.000004,   0.000009
        32,   0.000007,   0.000010
        64,   0.000014,   0.000010
       128,   0.000032,   0.000011
       256,   0.000072,   0.000014
       512,   0.000157,   0.000019
      1024,   0.000361,   0.000031
      2048,   0.000881,   0.000066
      4096,   0.002504,   0.000178
      8192,   0.007640,   0.000521
     16384,   0.025362,   0.001572
     32768,   0.090633,   0.004701
     65536,   0.342724,   0.014132
    131072,   1.335723,   0.045194
    262144,   5.273360,   0.111201
    524288,  20.791205,   0.301488
   1048576,  82.617938,   0.833644

Here is the rest of the program just in case anyone wants to play

def fibonacci_iterative(n):
    """
    Work out n'th Fibonacci number in an iterative fashion
    """
    a, b = 0, 1
    while n > 0:
        a, b = a + b, a
        n -= 1
    return a

if __name__ == "__main__":
    # warmup
    fibonacci_noniterative(100)
    print "         n,  iterative, noniterative"
    for e in range(30):
        i = 2 ** e
        t0 = time()
        f_iterative = fibonacci_iterative(i)
        t_iterative = time() - t0
        t0 = time()
        f_noniterative = fibonacci_noniterative(i)
        t_noniterative = time() - t0
        print "%10d, %10.6f, %10.6f" % (i, t_iterative, t_noniterative)
        if f_iterative != f_noniterative:
            print "Calculation error"
            print "iterative", f_iterative
            print "non iterative", f_noniterative
            print "difference", f_iterative-f_noniterative

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From Ron.Barak at lsi.com  Mon Feb 23 04:32:52 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 09:32:52 +0000
Subject: Metaclass conflict TypeError exception: problem demonstration script
In-Reply-To: <20090222145717.787F04A136E@riobu.com>
References: <20090222145717.787F04A136E@riobu.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>

Hi Guys,

Thanks to Michele, Chris, Hrvoje et. al. who helped me trying to resolve the metaclass exception when a class has two parents problem.
This post tries to unify all the metaclasses exception threads, in an attempt to reach a solution.

I've created a short demo script (metaclass_test01.py) that demonstrate the problem.
Listings of metaclass_test01.py and CopyAndPaste are below and attached.

Note:

When line 8 in metaclass_test01.py is in effect (with line 7 commented out), the script runs normally.

However, when line 7 is in effect (with line 8 commented out), viz.:

$ cat -n metaclass_test01.py | head
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  class ListControl(wx.Frame, CopyAndPaste):
     8  #class ListControl(wx.Frame):
     9      def __init__(self, parent, id, title, list, max_list_width):
    10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)

I get the metaclass conflict exception:

$ python metaclass_test01.py
Traceback (most recent call last):
  File "metaclass_test01.py", line 7, in <module>
    class ListControl(wx.Frame, CopyAndPaste):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

I hope that now the problem is demonstrated more clearly, and the gurus out there could point me in the right direction towards a solution.

Bye,
Ron.

________________________________
$ cat -n metaclass_test01.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  #class ListControl(wx.Frame, CopyAndPaste):
     8  class ListControl(wx.Frame):
     9      def __init__(self, parent, id, title, list, max_list_width):
    10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)
    11          self.list = list
    12          self.list_ctrl = wx.ListCtrl(self, -1, style=wx.LC_REPORT| wx.LC_NO_HEADER)
    13          self.list_ctrl.InsertColumn(0, title)
    14          for i,line_ in enumerate(list):
    15              self.list_ctrl.InsertStringItem(i, line_)
    16          self.list_ctrl.SetColumnWidth(0, max_list_width)
    17
    18          self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnItemSelected, self.list_ctrl)
    19
    20          self.Raise()
    21          self.Show(True)
    22
    23      def OnItemSelected(self, evt):
    24          item = evt.GetText()
    25          max_list_width = 10 * len(item)
    26          ListControl(self, -1, item, item, max_list_width)
    27
    28  if __name__ == "__main__":
    29      list = [   "First Line", "Second Line", "Third Line"]
    30      app = wx.App(redirect=False)
    31      max_list_width = 6 * max([len(x) for x in list])
    32      ListControl(None, -1, "Parent Window", list, max_list_width)
    33      app.MainLoop()
________________________________
$ cat -n CopyAndPaste.py
     1  #!/usr/bin/env python
     2
     3  import wx
     4
     5  class CopyAndPaste(object):
     6
     7      def __init__(self):
     8          pass
     9
    10      def set_copy_and_paste(self):
    11          """
    12          Setting clipboard copy-and-pasting (only copying from the application to the
    13          clipboard is supported).
    14          The "menu" menu is hidden, and is only there to facilitate the acceleration table.
    15          Both CTRL-C and CTRL-Ins are supported.
    16          """
    17          menu = wx.Menu()
    18          copy_ = menu.Append(-1, "&Copy\tCtrl-Ins") # Copy with accelerator
    19          minimize_ = menu.Append(-1, "Minimize") #
    20          close_ = menu.Append(-1, "Close window\tCtrl-W") # Close window
    21          exit_ = menu.Append(-1, "E&xit application\tCtrl-X") # Close window
    22
    23          self.Bind(wx.EVT_MENU, self.on_copy, copy_)
    24          self.Bind(wx.EVT_MENU, self.on_minimize, minimize_)
    25          self.Bind(wx.EVT_MENU, self.on_close, close_)
    26          self.Bind(wx.EVT_MENU, self.on_exit, exit_)
    27
    28          menuBar = wx.MenuBar()
    29          self.SetMenuBar(menuBar)
    30
    31          acceltbl = wx.AcceleratorTable( [
    32                  (wx.ACCEL_CTRL, ord('C'), copy_.GetId()),
    33                  (wx.ACCEL_CTRL, ord('W'), close_.GetId()),
    34                  (wx.ACCEL_CTRL, ord('X'), exit_.GetId()),
    35                  (wx.ACCEL_CTRL, ord('Q'), exit_.GetId()),
    36                  (wx.ACCEL_CTRL, wx.WXK_INSERT, copy_.GetId()),
    37                  (wx.ACCEL_CTRL, wx.WXK_NUMPAD_INSERT, copy_.GetId()),
    38              ])
    39          self.SetAcceleratorTable(acceltbl)
    40
    41          # Setting popup menu
    42
    43          self.popupmenu = menu
    44          self.Bind(wx.EVT_CONTEXT_MENU, self.on_show_popup)
    45
    46      def on_show_popup(self, evt):
    47          pos = evt.GetPosition()
    48          pos = self.list_ctrl.ScreenToClient(pos)
    49          self.PopupMenu(self.popupmenu, pos)
    50
    51      def get_data_for_clipboard(self,format="text"):
    52          """
    53          Return data ready to be copied to the clipboard.
    54
    55          This is an abstract method - concrete subclasses must override this.
    56
    57          Sample implementation of get_data_for_clipboard() is:
    58
    59          def get_data_for_clipboard(self,format="text"):
    60              first_selected = self.list_ctrl.GetFirstSelected()
    61              selected_item_count = self.list_ctrl.GetSelectedItemCount()
    62              text_for_clipboard = ""
    63              for i in range(first_selected,first_selected+selected_item_count):
    64                  text_for_clipboard = "%s%s\n" % (text_for_clipboard, self.list_ctrl.GetItemText(i))
    65              return(text_for_clipboard)
    66          """
    67          raise NotImplementedError
    68
    69      def on_copy(self, evt):
    70          """
    71          """
    72          text_for_clipboard = self.get_data_for_clipboard()
    73
    74          data = wx.TextDataObject()
    75          data.SetText(text_for_clipboard)
    76          if wx.TheClipboard.Open():
    77              wx.TheClipboard.SetData(data)
    78              wx.TheClipboard.Close()
    79          else:
    80              wx.MessageBox("Unable to copy to the clipboard", "Error")
    81
    82      def on_minimize(self, evt):
    83          self.Iconize()
    84
    85      def on_close(self, evt):
    86          self.Close()
    87
    88      def on_exit(self, evt):
    89          try:
    90              self.Parent.Close()
    91          except AttributeError:
    92              self.Close()
    93
    94
    95  if __name__ == "__main__":
    96
    97      app = wx.App(redirect=False)
    98      copy_and_paste = CopyAndPaste()
    99      app.MainLoop()
   100
________________________________
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From mail at timgolden.me.uk  Mon Feb 23 04:36:36 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 23 Feb 2009 09:36:36 +0000
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <49A26E24.5060602@timgolden.me.uk>

> $ cat -n metaclass_test01.py | head
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste):
>      8  #class ListControl(wx.Frame):
>      9      def __init__(self, parent, id, title, list, max_list_width):
>     10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1), style=wx.DEFAULT_FRAME_STYLE)
> 
> I get the metaclass conflict exception:


You're trying to use a module as a base class.
Don't do that; it doesn't work.

TJG


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:38:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:38:43 -0200
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <op.upss2tf6x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:32:52 -0200, Barak, Ron <Ron.Barak at lsi.com>  
escribi?:

> $ cat -n metaclass_test01.py | head
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste):
>      8  #class ListControl(wx.Frame):
>      9      def __init__(self, parent, id, title, list, max_list_width):
>     10          wx.Frame.__init__(self,parent,id,title,size=(-1,-1),  
> style=wx.DEFAULT_FRAME_STYLE)
>
> I get the metaclass conflict exception:
>
> $ python metaclass_test01.py
> Traceback (most recent call last):
>   File "metaclass_test01.py", line 7, in <module>
>     class ListControl(wx.Frame, CopyAndPaste):
> TypeError: Error when calling the metaclass bases
>     metaclass conflict: the metaclass of a derived class must be a  
> (non-strict) subclass of the metaclasses of all its bases
>
> I hope that now the problem is demonstrated more clearly, and the gurus  
> out there could point me in the right direction towards a solution.

You want the CopyAndPaste *class*, not the *module*!

-- 
Gabriel Genellina



From jonas.esp at googlemail.com  Mon Feb 23 04:40:47 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 01:40:47 -0800 (PST)
Subject: Access from class variable to one on constructor
Message-ID: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>

How to access from a class variable to one that is initialized on the
constructor?
--------------
class Foo():
  foo = bar  # I want to access *from here* to variables created on
the constructor.

  def __init__(self, bar_init):
    self.bar = bar_init
--------------

Note: I've to create a subclass where the parent class to get
variables using *for i in dir(self): * so it doesn't get variables
initialized on the constructor.


From stef.mientki at gmail.com  Mon Feb 23 04:57:05 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 10:57:05 +0100
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
Message-ID: <49A272F1.7090004@gmail.com>

thanks Ron,

but I was looking for a more general solution,
in which I don't change the program itself,
and where the error messages (in general) become more informative than 
it is by default.

cheers,
Stef


Barak, Ron wrote:
> Hi Stef,
>
> You can do something like (not tested):
>
> try: 
> 	self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> except IndexError,e:
>                 msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
>                 print msg
>                 
> Bye,
> Ron.
> 	
>   
>> -----Original Message-----
>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>> Sent: Sunday, February 22, 2009 15:43
>> To: python-list at python.org
>> Subject: can error messages be improved or can they be overridden ?
>>
>> hello,
>>
>> I often get an error message like this
>>
>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>> IndexError: list index out of range
>>
>> Now it would be very welcome,
>> if the error message specified which index is out of range, 
>> in this case e.g.,
>> - specifying the length of self.EP
>> - specifying the value of self.EP[2]
>> - specifying the length of self.Brick.Par etc..
>>
>> Is there a way to override the error message and provide this 
>> information, or is it impossible ?
>>
>> And if it's possible, am I the only one who often stumbles 
>> about this problem ?
>> (I expect many people must have bounced in this problem before me ;-)
>>
>> thanks,
>> Stef Mientki
>>
>>
>>     



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 04:57:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 07:57:18 -0200
Subject: different errors, return outside function and others
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
	<ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>
Message-ID: <op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:07:57 -0200, Tony <sternbrightblade at gmail.com>  
escribi?:

> ok thank you for that input, this is my first class in programming and  
> its
> the only one the school offers. im pretty sure those are supposed to be
> modules
> that im writting. would it make a difference if those were modules and  
> not
> functions? kinda stupid question there but im trying to learn as much as
> possible.

Each module is a separate file, with extension .py
If you put all your code in a single file, you write a single module.  
That's fine in this case, unless it grows to something unmanageable.

Functions are blocks of code that have a name and "do" something specific,  
and usually return some result. They start with the keyword "def". You  
have defined several functions already, but called them "modules" in the  
comments, that's wrong and may be confusing.

> Also anything with def infront of it example def start(): would be a
> function correct? also im Using 2.5 and the IDLE to do this

Exactly!

I think you have written so much code without testing it. It's time to  
test every piece now. Start with... the start function, obviously!

But before, you have to clean your code. There are a few strange lines  
that should not be there (all those lines on the left margin that aren't  
"def" statements, like intro_area(), alley()...). Just remove or comment  
them.

Then you can start testing each function, one at a time. Simply call the  
function with the desired parameters (if any), right at the bottom of the  
file. To test the first one (start), use something like this:

print "about to call start()"
result = start()
print "start() finished, result=", result

and do the same for each individual function. Once you know each piece  
works fine, you can start combining them until you build the complete  
program.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 05:02:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 08:02:17 -0200
Subject: Access from class variable to one on constructor
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
Message-ID: <op.upst53y3x6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.esp at googlemail.com>  
escribi?:

> How to access from a class variable to one that is initialized on the
> constructor?
> --------------
> class Foo():
>   foo = bar  # I want to access *from here* to variables created on
> the constructor.
>
>   def __init__(self, bar_init):
>     self.bar = bar_init
> --------------

Unless I misunderstand you, you can't do that. Class variables are shared  
by all instances and don't depend on a particular instance - they exist  
even *before* any instance is created.

> Note: I've to create a subclass where the parent class to get
> variables using *for i in dir(self): * so it doesn't get variables
> initialized on the constructor.

This part I don't understand at all. Perhaps a concrete example, showing  
what you actually want at the end?

-- 
Gabriel Genellina



From gabriel.rossetti at arimaz.com  Mon Feb 23 05:10:16 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 23 Feb 2009 11:10:16 +0100
Subject: shared lib from python code?
Message-ID: <49A27608.3050403@arimaz.com>

Hello everyone,

I would like to know if it is possible to turn python code into a shared 
lib? I have several processes that use the same base code, and it seems 
like every process loads the "shared" code into memory. I would like it 
to be loaded once and shared, like a .so in linux or a .dll in windows 
and have the interpreters use the dared copy. Is there a way to do this?

Thank you,
Gabriel


From jonas.esp at googlemail.com  Mon Feb 23 05:17:52 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:17:52 -0800 (PST)
Subject: Get variables on constructor
Message-ID: <0185d001-203d-4aa3-abe7-5674997f8428@t13g2000yqc.googlegroups.com>

To get class variables can be used *for i in dir(self): * but how to
get variables initialized on the constructor?


From http  Mon Feb 23 05:37:49 2009
From: http (Paul Rubin)
Date: 23 Feb 2009 02:37:49 -0800
Subject: shared lib from python code?
References: <mailman.510.1235383861.11746.python-list@python.org>
Message-ID: <7x63j1v3pe.fsf@ruckus.brouhaha.com>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> writes:
> I would like to know if it is possible to turn python code into a
> shared lib? I have several processes that use the same base code, and
> it seems like every process loads the "shared" code into memory. I
> would like it to be loaded once and shared, like a .so in linux or a
> .dll in windows and have the interpreters use the dared copy. Is there
> a way to do this?

I guess it's not completely inconceivable--Emacs used something called
unexec back in the day, that transmogrified part of its data segment
into the text segment and dumped it out as a runnable binary--but it
doesn't seem worth it nowadays, given how small your .pyc's are likely
to be relative to the size of memory.  If you're concerned about the
import overhead, maybe you can structure your program as a persistent
process instead of re-running it all the time.


From jonas.esp at googlemail.com  Mon Feb 23 05:38:30 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:38:30 -0800 (PST)
Subject: Get variables on constructor [Solved]
References: <0185d001-203d-4aa3-abe7-5674997f8428@t13g2000yqc.googlegroups.com>
Message-ID: <c1b17e76-8712-40cd-810a-de904ce40cd7@o36g2000yqh.googlegroups.com>

On 23 feb, 10:17, Kless <jonas.... at googlemail.com> wrote:
> To get class variables can be used *for i in dir(self): * but how to
> get variables initialized on the constructor?

Sorry. It's so simple as insert *self*.


From jonas.esp at googlemail.com  Mon Feb 23 05:48:19 2009
From: jonas.esp at googlemail.com (Kless)
Date: Mon, 23 Feb 2009 02:48:19 -0800 (PST)
Subject: Access from class variable to one on constructor [Solved]
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
	<mailman.509.1235383504.11746.python-list@python.org>
Message-ID: <96d9815a-61c8-4745-94b8-532fd0489b7e@v42g2000yqj.googlegroups.com>

Thanks Gabriel. You have reason, and I was having a design error.

On 23 feb, 10:02, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.... at googlemail.com> ?
> escribi?:
>
> > How to access from a class variable to one that is initialized on the
> > constructor?
> > --------------
> > class Foo():
> > ? foo = bar ?# I want to access *from here* to variables created on
> > the constructor.
>
> > ? def __init__(self, bar_init):
> > ? ? self.bar = bar_init
> > --------------
>
> Unless I misunderstand you, you can't do that. Class variables are shared ?
> by all instances and don't depend on a particular instance - they exist ?
> even *before* any instance is created.
>
> > Note: I've to create a subclass where the parent class to get
> > variables using *for i in dir(self): * so it doesn't get variables
> > initialized on the constructor.
>
> This part I don't understand at all. Perhaps a concrete example, showing ?
> what you actually want at the end?
>
> --
> Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 05:48:49 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 08:48:49 -0200
Subject: shared lib from python code?
References: <49A27608.3050403@arimaz.com>
Message-ID: <op.upswbnytx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 08:10:16 -0200, Gabriel Rossetti  
<gabriel.rossetti at arimaz.com> escribi?:

> I would like to know if it is possible to turn python code into a shared  
> lib? I have several processes that use the same base code, and it seems  
> like every process loads the "shared" code into memory. I would like it  
> to be loaded once and shared, like a .so in linux or a .dll in windows  
> and have the interpreters use the dared copy. Is there a way to do this?

I don't think so.
What you consider "code" isn't usually just code: there are functions,  
classes, instances, constants, modules, docstrings... a myriad of objects.  
You can't share objects between processes.

Although true code objects are immutable and *could* be shared (with a lot  
of work), I don't think code objects actually could take so much memory as  
to be a problem.

-- 
Gabriel Genellina



From andrew at acooke.org  Mon Feb 23 06:14:34 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 08:14:34 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <21425a030186ab9c40012a19048b4f92.squirrel@localhost>

Steven D'Aprano wrote:
> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>
>> as far as i understand things, the best model is:
>>
>> 1 - everything is an object
>> 2 - everything is passed by reference
>
> Except that is wrong. If it were true, you could do this:
[pointer swapping]

i was thinking of how the stack is used; i would have called what you are
talking about "pointer semantics".  however, on reading around a little,
it seems that i'm in a very small minority (which is a pity, because if
you restrict the meaning to how values are handled on the stack then you
get a lot closer to having just values and references, rather than the
whole pile of different terms that are apparently in use).

sorry for the confusion,
andrew




From greg.ewing at canterbury.ac.nz  Mon Feb 23 06:31:29 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 24 Feb 2009 00:31:29 +1300
Subject: ANN: SuPy 1.5
Message-ID: <mailman.553.1235418492.11746.python-announce-list@python.org>

SuPy 1.5 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

New in this version:

- Tool and Observer classes can be implemented in Python
- Contextual menu facilities
- Modifier key and status bar constants
- to_length() function
- dir() works on Ruby classes


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From gabriel.rossetti at arimaz.com  Mon Feb 23 06:43:18 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Mon, 23 Feb 2009 12:43:18 +0100
Subject: shared lib from python code?
In-Reply-To: <49A27608.3050403@arimaz.com>
References: <49A27608.3050403@arimaz.com>
Message-ID: <49A28BD6.9040701@arimaz.com>

Gabriel Rossetti wrote:
> Hello everyone,
>
> I would like to know if it is possible to turn python code into a 
> shared lib? I have several processes that use the same base code, and 
> it seems like every process loads the "shared" code into memory. I 
> would like it to be loaded once and shared, like a .so in linux or a 
> .dll in windows and have the interpreters use the dared copy. Is there 
> a way to do this?
>
> Thank you,
> Gabriel
>
Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
don' t want to share code as in have multiple processes access a 
variable and have the same value, like it is done in threads, what I 
want is to not have n copies of the code (classes, functions, etc) 
loaded by n python interpreters. When you load Apache for instance, it 
runs n processes but loads only one copy of parts of it's code (so/dll), 
that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
so once the system has loaded it, it doesn' t re-load it when another 
process needs it.

Thank you,
Gabriel


From mark.dufour at gmail.com  Mon Feb 23 06:54:17 2009
From: mark.dufour at gmail.com (Mark Dufour)
Date: Mon, 23 Feb 2009 12:54:17 +0100
Subject: ANN: Shed Skin 0.1, an experimental (restricted-)Python-to-C++ 
	Compiler
Message-ID: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>

Hi all,

I have recently released version 0.1 of Shed Skin, an experimental
(restricted-)Python-to-C++ compiler.

Please see my blog for more info about the release:

http://shed-skin.blogspot.com


Thanks,
Mark Dufour.
-- 
"One of my most productive days was throwing away 1000 lines of code"
- Ken Thompson


From nytrokiss at gmail.com  Mon Feb 23 07:25:52 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Mon, 23 Feb 2009 14:25:52 +0200
Subject: ANN: Shed Skin 0.1, an experimental (restricted-)Python-to-C++ 
	Compiler
In-Reply-To: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>
References: <8180ef690902230354x39ec002cn8d6f229a8f45603a@mail.gmail.com>
Message-ID: <8a6b8e350902230425x1176afa3ge7001e21013ce001@mail.gmail.com>

Nice! I was looking for one of these for a while

On Mon, Feb 23, 2009 at 1:54 PM, Mark Dufour <mark.dufour at gmail.com> wrote:

> Hi all,
>
> I have recently released version 0.1 of Shed Skin, an experimental
> (restricted-)Python-to-C++ compiler.
>
> Please see my blog for more info about the release:
>
> http://shed-skin.blogspot.com
>
>
> Thanks,
> Mark Dufour.
> --
> "One of my most productive days was throwing away 1000 lines of code"
> - Ken Thompson
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From ccormie at aussiemail.com.au  Mon Feb 23 07:41:20 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Mon, 23 Feb 2009 23:41:20 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
Message-ID: <01b28edb$0$20619$c3e8da3@news.astraweb.com>


> If that not-very-technical description [all I've ever needed] doesn't
> help, you'll need to read the DW help file (HTFF1K) or wait till
> someone who knows what they are doing comes along :-)

LOL, I am that person :p
Your technique works well and it does provide the information and it is 
a (roundabout) solution to this class of problems:  thank you very much. 
It doesn't answer the original question so I'll restate it:

How do you get *Python* to tell you the dll and the problem symbol? Not 
external tools, Python. Python at a low level is calling LoadLibrary and 
GetProcAddress to resolve symbols and the call fails. At that point it 
has the name of the dll and the problem symbol to hand and yet strangely 
only gives an opaque error message. How does one get Python to print out 
the faulty DLL and symbol?

(Even if it means a debug build of Python and adding the printf 
yourself, I just want to know where we stand on this issue! :) )

Best Regards,
Chris


From koranthala at gmail.com  Mon Feb 23 07:42:23 2009
From: koranthala at gmail.com (koranthala)
Date: Mon, 23 Feb 2009 04:42:23 -0800 (PST)
Subject: Server programming
Message-ID: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>

Hi,
      Is server programming in Python procedure oriented or object
oriented?
      I have this question because lately I am asked to make a medium
complex web program (extremely database oriented) using Django. When I
used to do application programs earlier (in Python itself), the whole
thing being object oriented came out easily in programming. So, I was
able to use different patterns etc for programming and the whole thing
was - quite fun to design and create.
      But when I program in Django, since I just have to work on user
responses - everything else being taken care of by Django - only, the
complete coding has become procedure oriented. It is not kludgy or
anything, but it doesnt have the nice feeling that we get when we code
a proper object oriented program.
      Is my coding in error here? This is infact my first web program,
so it might be the reason. What does other people find? Does web
server programming using web frameworks (Django, TurboGears etc) make
it procedure oriented? If I am in the wrong, it might be due to a
wrong design or mindset, and I would like to change it.




From see_website at mindprod.com.invalid  Mon Feb 23 07:56:54 2009
From: see_website at mindprod.com.invalid (Roedy Green)
Date: Mon, 23 Feb 2009 04:56:54 -0800
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com>
	<kfbtyi.45w@spenarnc.xs4all.nl>
Message-ID: <n375q4d933h748c5bnpfjrbcrvdilvn7vt@4ax.com>

On 19 Feb 2009 18:56:42 GMT, Albert van der Horst
<albert at spenarnc.xs4all.nl> wrote, quoted or indirectly quoted someone
who said :

>Note here, that eXtreme
>>Programing is one of the snake oil,

Extreme programming is a variant on Deming's idea of constant
incremental improvement that revolutionised quality in manufacturing.

It is also based on the obvious idea that you will be smarter after
you have used some version of a program than you are today. There are
so many computer programs perfectly compliant with specs that looked
good on paper but nobody ever tested with actual use to refine them
until the project was "complete" and it was too expensive to fix them.


-- 
Roedy Green Canadian Mind Products
http://mindprod.com

One path leads to despair and utter hopelessness. The other, 
to total extinction. Let us pray we have the wisdom to choose correctly. 
~ Woody Allen .


From alwaseem307ster at yahoo.com  Mon Feb 23 08:03:13 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 05:03:13 -0800 (PST)
Subject: pysqlite smart search
In-Reply-To: <22157116.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com>
Message-ID: <22161119.post@talk.nabble.com>




klia wrote:
> 
>  Hey guys;
> 
> I am trying to develop a tiny program using python to search inside sqlite
> database with file extension is .db in which the program will ask users to
> enter their search query and base on that it will retrieve the results But
> 
> I need the program to have some smartness in search mechanism in which the
> program will guess that the user is looking for these key words in the
> database.
> 
> so far i came up with this but the search ain't smart, i have to write the
> full key word in order to retrieve specific information.
> 
> from pysqlite2 import dbapi2 as sqlite3
> 
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()
> 
> Any ideas and
> thanks in advance
> Reply
> 

thank you man, it worked perfectly but one more thing;

when i print rows it retrieves the whole rows of info which i don't need, i
need just to retrieve the name of the photo. 
so how am i gonna do that?
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22161119.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From sjmachin at lexicon.net  Mon Feb 23 08:05:49 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 23 Feb 2009 05:05:49 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>

On Feb 23, 11:41?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> > If that not-very-technical description [all I've ever needed] doesn't
> > help, you'll need to read the DW help file (HTFF1K) or wait till
> > someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p

It wasn't apparent, and still isn't.

> Your technique works well and it does provide the information and it is
> a (roundabout) solution to this class of problems: ?thank you very much.
> It doesn't answer the original question so I'll restate it:
>
> How do you get *Python* to tell you the dll and the problem symbol? Not
> external tools, Python. Python at a low level is calling LoadLibrary and
> GetProcAddress to resolve symbols and the call fails. At that point it
> has the name of the dll and the problem symbol to hand and yet strangely
> only gives an opaque error message. How does one get Python to print out
> the faulty DLL and symbol?

If you know all that, then the answer is to submit a patch, isn't it??


> (Even if it means a debug build of Python and adding the printf
> yourself,

printf? Maybe you shouldn't submit a patch after all.



From duncan.booth at invalid.invalid  Mon Feb 23 08:09:15 2009
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 23 Feb 2009 13:09:15 GMT
Subject: shared lib from python code?
References: <49A27608.3050403@arimaz.com>
	<mailman.514.1235389443.11746.python-list@python.org>
Message-ID: <Xns9BBB84727E289duncanbooth@127.0.0.1>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> wrote:

> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
> don' t want to share code as in have multiple processes access a 
> variable and have the same value, like it is done in threads, what I 
> want is to not have n copies of the code (classes, functions, etc) 
> loaded by n python interpreters. When you load Apache for instance, it 
> runs n processes but loads only one copy of parts of it's code (so/dll), 
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
> so once the system has loaded it, it doesn' t re-load it when another 
> process needs it.
> 

It doesn't matter how you restate it, the answer is still the one Gabriel 
Genellina gave you: Python code objects are not shared between processes.

Code objects are immutable, but they are still objects like everything else 
in Python. That means they are reference counted and discarded when no 
longer referenced.

To share code objects between different processes you would have to change 
the reference counting mechanism so it was either safe across multiple 
processes or didn't reference count shared code objects (but still ref 
counted non-shared objects).

The actual code is just stored in a string, so perhaps you could share 
those strings between processes: just executing the code doesn't change the 
string's refcount (whereas it does change the function and the code 
objects' counts). You could probably make something work simply by editing 
the code constructor to move the code into shared memory and using some 
other mechanism to control the shared memory storage.

C extension libraries on the other hand may be shared.

-- 
Duncan Booth http://kupuguy.blogspot.com


From deets at nospam.web.de  Mon Feb 23 08:10:49 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 14:10:49 +0100
Subject: shared lib from python code?
In-Reply-To: <mailman.514.1235389443.11746.python-list@python.org>
References: <49A27608.3050403@arimaz.com>
	<mailman.514.1235389443.11746.python-list@python.org>
Message-ID: <70flipF47gafU1@mid.uni-berlin.de>

Gabriel Rossetti schrieb:
> Gabriel Rossetti wrote:
>> Hello everyone,
>>
>> I would like to know if it is possible to turn python code into a 
>> shared lib? I have several processes that use the same base code, and 
>> it seems like every process loads the "shared" code into memory. I 
>> would like it to be loaded once and shared, like a .so in linux or a 
>> .dll in windows and have the interpreters use the dared copy. Is there 
>> a way to do this?
>>
>> Thank you,
>> Gabriel
>>
> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
> don' t want to share code as in have multiple processes access a 
> variable and have the same value, like it is done in threads, what I 
> want is to not have n copies of the code (classes, functions, etc) 
> loaded by n python interpreters. When you load Apache for instance, it 
> runs n processes but loads only one copy of parts of it's code (so/dll), 
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
> so once the system has loaded it, it doesn' t re-load it when another 
> process needs it.

This is not done, and most probably won't ever happen. What would you do 
with this?

import random
import foo


if random.random() > .5:
    foo.some_function = lambda x: x ** 2
else:
    foo.some_function = lambda x: x + 2


If the module foo would be shared amongst processes, these would affect 
the code of each other. Not so nice.

Of course one could try & cough up some read-only, copy-on-modify 
scheme, but that would be hard, if not impossible - and for rather 
minimal gains. Take a look at the compiled *.pyc-files (which should 
pretty much represent the memory they consume) - they are in the kbytes. 
So optimizing here would be a waste I'd say.


Diez


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 08:49:59 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 11:49:59 -0200
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <op.ups4plvzx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 10:41:20 -0200, Chris Cormie  
<ccormie at aussiemail.com.au> escribi?:

>> If that not-very-technical description [all I've ever needed] doesn't
>> help, you'll need to read the DW help file (HTFF1K) or wait till
>> someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p
> Your technique works well and it does provide the information and it is  
> a (roundabout) solution to this class of problems:  thank you very much.  
> It doesn't answer the original question so I'll restate it:
>
> How do you get *Python* to tell you the dll and the problem symbol? Not  
> external tools, Python. Python at a low level is calling LoadLibrary and  
> GetProcAddress to resolve symbols and the call fails. At that point it  
> has the name of the dll and the problem symbol to hand and yet strangely  
> only gives an opaque error message. How does one get Python to print out  
> the faulty DLL and symbol?

You can't, because it isn't Python who's trying to load the symbol - the  
*only* symbol that Python attempts to import itself is "initFOO" from  
FOO.pyd, and when that fails you get an explicit message.
The error you see must come from the extension itself, and propagates into  
Python as an ImportError.

-- 
Gabriel Genellina



From venutaurus539 at gmail.com  Mon Feb 23 08:51:36 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 05:51:36 -0800 (PST)
Subject: opening files with names in non-english characters.
Message-ID: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>

Hi all,
          I am trying to find the attributes of afile whose name has
non english characters one like given below. When I try to run my
python scirpt, it fails giving out an error filename must be in string
or UNICODE. When i try to copy the name of the file as a strinig, it
(KOMODO IDE) is not allowing me to save the script saying that it
cannot convert some of the characters in the current encoding which is
Western European(CP-1252).

0010testUnicode_???????????????????? !#$%&'()+,-.
0123456789;=@ABCD.txt.txt

            Hope some one could help me in this regard.

Thank you in advance,

Venu Madhav


From cwitts at gmail.com  Mon Feb 23 08:51:44 2009
From: cwitts at gmail.com (Chris)
Date: Mon, 23 Feb 2009 05:51:44 -0800 (PST)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com> 
	<mailman.507.1235383028.11746.python-list@python.org>
Message-ID: <bbbd9c93-e6c8-41f9-8c59-ab8d27fb98fa@v18g2000vbb.googlegroups.com>

On Feb 23, 11:57?am, Stef Mientki <stef.mien... at gmail.com> wrote:
> thanks Ron,
>
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than
> it is by default.
>
> cheers,
> Stef
>
> Barak, Ron wrote:
> > Hi Stef,
>
> > You can do something like (not tested):
>
> > try:
> > ? ?self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> > except IndexError,e:
> > ? ? ? ? ? ? ? ? msg = "%s: '%s %s %s %d" % (e.strerror,e.filename,self.EP,self.EP[2],len(self.Brick.Par))
> > ? ? ? ? ? ? ? ? print msg
>
> > Bye,
> > Ron.
>
> >> -----Original Message-----
> >> From: Stef Mientki [mailto:stef.mien... at gmail.com]
> >> Sent: Sunday, February 22, 2009 15:43
> >> To: python-l... at python.org
> >> Subject: can error messages be improved or can they be overridden ?
>
> >> hello,
>
> >> I often get an error message like this
>
> >> ? ? self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> >> IndexError: list index out of range
>
> >> Now it would be very welcome,
> >> if the error message specified which index is out of range,
> >> in this case e.g.,
> >> - specifying the length of self.EP
> >> - specifying the value of self.EP[2]
> >> - specifying the length of self.Brick.Par etc..
>
> >> Is there a way to override the error message and provide this
> >> information, or is it impossible ?
>
> >> And if it's possible, am I the only one who often stumbles
> >> about this problem ?
> >> (I expect many people must have bounced in this problem before me ;-)
>
> >> thanks,
> >> Stef Mientki
>
>

Why not something like this ?  I know it requires changing your
application
but tbh I don't see any other way.

try:
    self.Brick.Par [ self.EP[2] ]['FileName'] = filename
except IndexError, msg:
    try:
        v = self.EP[2]
        try:
            v = self.Brick.Par[v]
        except IndexError:
            v = 'self.Brick.Par[%s] is out of range'%v
    except IndexError:
        v = 'self.EP[2] is out of range'
    raise IndexError(msg.message, v)


From hniksic at xemacs.org  Mon Feb 23 08:53:01 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Mon, 23 Feb 2009 14:53:01 +0100
Subject: Metaclass conflict TypeError exception: problem demonstration
	script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com> (Ron
	Barak's message of "Mon\, 23 Feb 2009 09\:32\:52 +0000")
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
Message-ID: <87k57h8dky.fsf@mulj.homelinux.net>

"Barak, Ron" <Ron.Barak at lsi.com> writes:

> However, when line 7 is in effect (with line 8 commented out), viz.:
>
> $ cat -n metaclass_test01.py | head
>   1  #!/usr/bin/env python
>   2
>   3  import sys
>   4  import wx
>   5  import CopyAndPaste
>   6
>   7  class ListControl(wx.Frame, CopyAndPaste):

If this is the actual source you're running, then CopyAndPaste is a
module, not a type, and that causes the conflict.  Use
CopyAndPaste.CopyAndPaste, or change the import line to read "from
CopyAndPaste import CopyAndPaste".  Or, even better, adhere to
recommendations laid down in PEP 8 and you'll avoid confusion between
module and class names.


From andrew at acooke.org  Mon Feb 23 09:00:32 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 11:00:32 -0300 (CLST)
Subject: shared lib from python code?
In-Reply-To: <49A28BD6.9040701@arimaz.com>
References: <49A27608.3050403@arimaz.com> <49A28BD6.9040701@arimaz.com>
Message-ID: <89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>

Gabriel Rossetti wrote:
> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I
> don' t want to share code as in have multiple processes access a
> variable and have the same value, like it is done in threads, what I
> want is to not have n copies of the code (classes, functions, etc)
> loaded by n python interpreters. When you load Apache for instance, it
> runs n processes but loads only one copy of parts of it's code (so/dll),
> that's what I want to do. In C/C++ I would write a shared-lib (so/dll),
> so once the system has loaded it, it doesn' t re-load it when another
> process needs it.

i think i understand what you want.  the problem is that the kind of
language that python is really doesn't work well with that kind of
approach.  this is (and i may be wrong - i've not really thought much
about this before) largely because python places a very strong emphasis on
late binding.  that means that everything is very flexible - all kinds of
things can be changed "under the hood".  and that means that it is very
difficult to share things safely because almost any solution would end up
doing what you don't want (sharing variables, like with threads (even
though they are very deeply buried variables)) rather than what you do
want (just sharing the static part of the code to save space).

another way to see this is to see the connection with security.  this is
the flip side of your case - because things are so flexible it is very
hard to run some python code in a "sandbox" in a larger python program. 
there's some discussion on the dev group at the moment and it looks like
the solution is to only use function closures.  but even that doesn't work
without some patches that remove certain ways to dynamically alter the
code base.

andrew




From goodz158 at yahoo.com  Mon Feb 23 09:02:54 2009
From: goodz158 at yahoo.com (Good Z)
Date: Mon, 23 Feb 2009 06:02:54 -0800 (PST)
Subject: Getting Certification Chain from Digital Signature
Message-ID: <352443.74170.qm@web35901.mail.mud.yahoo.com>

All,  
I need to extract certification chain/private key from digital signature certificate (DSC). The Digital Signature (DSC) is in PFX file format. I got the Java code but do not know the python equivalent in python.

Any help will be appreciated.
Best Regards,
Mike



      
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From sion at paintbox.UUCP  Mon Feb 23 09:11:58 2009
From: sion at paintbox.UUCP (S Arrowsmith)
Date: 23 Feb 2009 14:11:58 GMT
Subject: count secton of data in list
References: <e01cc645-5bca-4582-8649-b1d2712cd20c@x9g2000yqk.googlegroups.com>
	<mailman.386.1235173577.11746.python-list@python.org>
	<3ed253bb-d6ec-4f47-af08-ad193e9c46e3@h16g2000yqj.googlegroups.com>
Message-ID: <kfivfy.db9@paintbox.UUCP>

In article <3ed253bb-d6ec-4f47-af08-ad193e9c46e3 at h16g2000yqj.googlegroups.com>,
odeits  <odeits at gmail.com> wrote:
>def count_consecutive(rows):
>    switch =3D 0
>    count =3D 0
>    for r in rows:
>        if r[-1] =3D=3D switch:
>            count +=3D 1
>        else:
>            switch =3D not switch
>            if count !=3D 0:
>                yield count
>                count =3D 0
>    if count !=3D 0:
>        yield count
>
>rows = [ ... ]
>
>for cnt in count_consecutive(rows):
>    print cnt

import itertools, operator

for k, g in itertools.groupby(rows, operator.itemgetter(3):
    print len(list(g))

-- 
\S

   under construction



From freelancer317 at gmail.com  Mon Feb 23 10:02:51 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Mon, 23 Feb 2009 10:02:51 -0500
Subject: pysqlite smart search
In-Reply-To: <22161119.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com> <22161119.post@talk.nabble.com>
Message-ID: <b1d973a70902230702k703c52b1qc44327c1a2b041de@mail.gmail.com>

2009/2/23 klia <alwaseem307ster at yahoo.com>

>
>
>
> klia wrote:
> >
> >  Hey guys;
> >
> > I am trying to develop a tiny program using python to search inside
> sqlite
> > database with file extension is .db in which the program will ask users
> to
> > enter their search query and base on that it will retrieve the results
> But
> >
> > I need the program to have some smartness in search mechanism in which
> the
> > program will guess that the user is looking for these key words in the
> > database.
> >
> > so far i came up with this but the search ain't smart, i have to write
> the
> > full key word in order to retrieve specific information.
> >
> > from pysqlite2 import dbapi2 as sqlite3
> >
> > connection = sqlite3.connect('Photos.db')
> > memoryConnection = sqlite3.connect(':memory:')
> > cursor = connection.cursor()
> > prompt = 'Enter your search query?\n'
> > keyword = raw_input(prompt)
> > if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> > print cursor.fetchall()
> > else:
> > cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> > print cursor.fetchall()
> >
> > Any ideas and
> > thanks in advance
> > Reply
> >
>
> thank you man, it worked perfectly but one more thing;
>
> when i print rows it retrieves the whole rows of info which i don't need, i
> need just to retrieve the name of the photo.
> so how am i gonna do that?


It depends on the structure of your table, but you're going to have to
change the following lines:
>if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
>cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
* indicates all fields in the selected records, so you need to
change the * to the field that contains the name of the photo.  For example:
if cursor.execute('SELECT name FROM photos WHERE Tag LIKE ?',[keyword]):

--
> View this message in context:
> http://www.nabble.com/pysqlite-smart-search-tp22157116p22161119.html
> Sent from the Python - python-list mailing list archive at Nabble.com.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
- Bret
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From Ron.Barak at lsi.com  Mon Feb 23 10:23:23 2009
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Mon, 23 Feb 2009 15:23:23 +0000
Subject: Solved: Metaclass conflict TypeError exception: problem
	demonstration script
In-Reply-To: <49A26E24.5060602@timgolden.me.uk>
References: <20090222145717.787F04A136E@riobu.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
	<49A26E24.5060602@timgolden.me.uk>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>

Hi,

> -----Original Message-----
> From: Tim Golden [mailto:mail at timgolden.me.uk]
> Sent: Monday, February 23, 2009 11:37
> Cc: python-list at python.org; wxpython-users at lists.wxwidgets.org
> Subject: Re: Metaclass conflict TypeError exception: problem
> demonstration script
>
> > $ cat -n metaclass_test01.py | head
> >      1  #!/usr/bin/env python
> >      2
> >      3  import sys
> >      4  import wx
> >      5  import CopyAndPaste
> >      6
> >      7  class ListControl(wx.Frame, CopyAndPaste):
> >      8  #class ListControl(wx.Frame):
> >      9      def __init__(self, parent, id, title, list,
> max_list_width):
> >     10
> wx.Frame.__init__(self,parent,id,title,size=(-1,-1),
> style=wx.DEFAULT_FRAME_STYLE)
> >
> > I get the metaclass conflict exception:
>
>
> You're trying to use a module as a base class.
> Don't do that; it doesn't work.
>
> TJG
>
>

That's it.

Once I changed my class header to:

$ cat -n metaclass_test01.py
     1  #!/usr/bin/env python
     2
     3  import sys
     4  import wx
     5  import CopyAndPaste
     6
     7  class ListControl(wx.Frame, CopyAndPaste.CopyAndPaste):

I'm getting no more Metaclass conflict TypeError exceptions   :-)
(a clear case of "The Devil Is In The ...")

Thanks so much,
Ron.
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From mail at timgolden.me.uk  Mon Feb 23 10:28:02 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 23 Feb 2009 15:28:02 +0000
Subject: Solved: Metaclass conflict TypeError exception: problem
	demonstration script
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>
References: <20090222145717.787F04A136E@riobu.com>	<7F0503CD69378F49BE0DC30661C6CCF659FDEDD5@enbmail01.lsi.com>
	<49A26E24.5060602@timgolden.me.uk>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEE5E@enbmail01.lsi.com>
Message-ID: <49A2C082.4050608@timgolden.me.uk>

Barak, Ron wrote:
> That's it.
> 
> Once I changed my class header to:
> 
> $ cat -n metaclass_test01.py
>      1  #!/usr/bin/env python
>      2
>      3  import sys
>      4  import wx
>      5  import CopyAndPaste
>      6
>      7  class ListControl(wx.Frame, CopyAndPaste.CopyAndPaste):
> 
> I'm getting no more Metaclass conflict TypeError exceptions   :-)
> (a clear case of "The Devil Is In The ...")



Glad we could help. Also a good indication of how important it
is to produce real code which really fails in the real way!
Sometimes you can look at it yourself even before you post
and see the problem.

:)

TJG


From deets at nospam.web.de  Mon Feb 23 10:49:01 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 16:49:01 +0100
Subject: pysqlite smart search
In-Reply-To: <mailman.517.1235394196.11746.python-list@python.org>
References: <22157116.post@talk.nabble.com>
	<mailman.517.1235394196.11746.python-list@python.org>
Message-ID: <70furdF4guqjU1@mid.uni-berlin.de>

klia schrieb:
> 
> 
> klia wrote:
>>  Hey guys;
>>
>> I am trying to develop a tiny program using python to search inside sqlite
>> database with file extension is .db in which the program will ask users to
>> enter their search query and base on that it will retrieve the results But
>>
>> I need the program to have some smartness in search mechanism in which the
>> program will guess that the user is looking for these key words in the
>> database.
>>
>> so far i came up with this but the search ain't smart, i have to write the
>> full key word in order to retrieve specific information.
>>
>> from pysqlite2 import dbapi2 as sqlite3
>>
>> connection = sqlite3.connect('Photos.db')
>> memoryConnection = sqlite3.connect(':memory:')
>> cursor = connection.cursor()
>> prompt = 'Enter your search query?\n'
>> keyword = raw_input(prompt)
>> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
>> print cursor.fetchall()
>> else:
>> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
>> print cursor.fetchall()
>>
>> Any ideas and
>> thanks in advance
>> Reply
>>
> 
> thank you man, it worked perfectly but one more thing;
> 
> when i print rows it retrieves the whole rows of info which i don't need, i
> need just to retrieve the name of the photo. 
> so how am i gonna do that?

select <columnname> ...

instead of

select *


Diez


From xahlee at gmail.com  Mon Feb 23 10:54:48 2009
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 23 Feb 2009 07:54:48 -0800 (PST)
Subject: programming by evolution?
References: <42a2e3fc-ec2e-4c09-b456-95a5fc4ce5a2@g39g2000pri.googlegroups.com>
	<6uuc4eFhc1u1U1@mid.individual.net>
	<11809792-676f-4d95-87c1-26666cc46b3b@w24g2000prd.googlegroups.com>
	<03db1c69-828a-4961-914d-62fe10ed88fb@w39g2000prb.googlegroups.com> 
	<kfbtyi.45w@spenarnc.xs4all.nl>
	<n375q4d933h748c5bnpfjrbcrvdilvn7vt@4ax.com>
Message-ID: <67b81919-4e73-4943-a6bc-5863e9a93a3a@j39g2000yqn.googlegroups.com>

On Feb 23, 4:56 am, Roedy Green <see_webs... at mindprod.com.invalid>
wrote:
> On 19 Feb 2009 18:56:42 GMT, Albert van der Horst
> <alb... at spenarnc.xs4all.nl> wrote, quoted or indirectly quoted someone
> who said :
>
> >Note here, that eXtreme
> >>Programing is one of the snake oil,
>
> Extreme programming is a variant on Deming's idea of constant
> incremental improvement that revolutionised quality in manufacturing.
>
> It is also based on the obvious idea that you will be smarter after
> you have used some version of a program than you are today. There are
> so many computer programs perfectly compliant with specs that looked
> good on paper but nobody ever tested with actual use to refine them
> until the project was "complete" and it was too expensive to fix them.

2009-02-09

Today, i happened to run across a blog on the eXtreme Programing
FUCK.
http://www.yosefk.com/blog/extreme-programming-explained.html

Great article!

  Xah
$B-t(B http://xahlee.org/



From john.ionides at gmail.com  Mon Feb 23 11:09:23 2009
From: john.ionides at gmail.com (John Ionides)
Date: Mon, 23 Feb 2009 08:09:23 -0800 (PST)
Subject: ZSI / MTOM
Message-ID: <1fd305a1-d087-4902-83ba-780e97bd042f@m24g2000vbp.googlegroups.com>

I have project for which I would like to have a python web service
including MTOM. It seems that ZSI is the most complete python web
service library but that it doesn't currently support MTOM - and
having worked through the code it looks as though it isn't going to be
exactly simple. Is there anyone working on a patch (or interested in
collaborating if it comes down to writing one)?

John


From schlaber at gmail.com  Mon Feb 23 11:13:53 2009
From: schlaber at gmail.com (Brot)
Date: Mon, 23 Feb 2009 08:13:53 -0800 (PST)
Subject: charset problems with urllib/urllib2
Message-ID: <a671c473-b576-4ebe-9aeb-48ac886d1323@s14g2000vbp.googlegroups.com>

Hello,

I am using the mailman-installation (http://www.gnu.org/software/
mailman/) from my hosting company. I doesn't have access to the
add_members script and so I am writing a python script which uses http
requests to subscribe new members.

But if I am posting a new member with an name, which includes "German
Umlaute" I see only weird characters in the admin-interface.
The mailman webinterface doesn't use utf-8. It always uses the
corresponding charset for the actual language setting.
If I post "B?rbel R?ssel" the admin-interface shows me the following
name: "B??rbel R??ssel"
I am using the German language setting, so mailman uses the ISO-8559-1
charset in the webinterface. If I switch my browser to UTF-8 the name
is correct in the admin-interface, but all other special characters
are wrong.

The strange thing for me is, that the name is correct if I subscribe
the member in the admin-interface manually. I don't know what the
different is between my python script and the manuell subscription.

To Post to my mailman-server I use this recipe (http://
code.activestate.com/recipes/146306/) to generate the
multipart/form-data POST

I looked into the Mailman source code and found the Util.canonstr
method. At the end it changes the string to an unicode string. So the
name is stored as unicode, isn't it? But why is there a difference if
I display the manuell inserted name and the automatic inserted name??

I used Tamper Data (https://addons.mozilla.org/en-US/firefox/addon/
966) to catch the request when I inserted the data manually through
the webinterface. The request generated with my script looks the same,
but the output isn't?

Does anyone have experience with this problem or with mailman and
urllib/urllib2?

~ Bernd


From tjreedy at udel.edu  Mon Feb 23 11:51:17 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 11:51:17 -0500
Subject: different errors, return outside function and others
In-Reply-To: <ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<ec06466f0902230008k43246ef6wca1b4fa716f93ab5@mail.gmail.com>
Message-ID: <gnuk64$c6$1@ger.gmane.org>

Tony wrote:
> The full error message says "There's an error in your program: *** 
> 'return' outside function (final(2).py, line 114)

Ah, you left the quotes off before, and you still omitted the error 
class (SyntaxError, see below).

When you are puzzled by an error, try to reduce the executed code to the 
MINIMUN needed to get the error.  (You can use your editor's block 
comment feature -- for IDLE see Format/Comment out [marked] region.)
For your error, the minimum is

 >>> return
SyntaxError: 'return' outside function (<pyshell#1>, line 1)

Return statements are only value inside functions and not in module 
level code.  Perhaps you think you 'return' is in a function but it is 
not because it is not indented.

Terry Jan Reedy



From aquil.abdullah at gmail.com  Mon Feb 23 11:53:20 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 08:53:20 -0800 (PST)
Subject: A tale of two execs
Message-ID: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>

Hello All,
  I am working on a project where I need to support versions of Python
as old as 2.3. Previously, we distributed Python with our product, but
this seemed a bit silly so we are no longer doing this.  The problem
that I am faced with is that we have Python scripts that use the
subprocess module, and subprocess is not available in Python 2.3.
Below is the strategy I am thinking about using, however if, you have
better ideas please let me know.

def runner(cmd, stdin, stdout, ...):
  try:
    import subprocess
    sbm = 1
  except:
    sbm = 0

  # Now do something
  if sbm:
    process = subporcess(...)
  else:
    import popen2
    process = popen2.Popen4(...)

Has anyone else run into a situation similar to this one?


From zelegolas at gmail.com  Mon Feb 23 11:55:38 2009
From: zelegolas at gmail.com (zelegolas)
Date: Mon, 23 Feb 2009 08:55:38 -0800 (PST)
Subject: Python Imaging Library (PIL): create PDF from scratch
Message-ID: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>

Hi,

I have some scan generated by SANE and i would like to do some
transformation (like crop, brightness and resize) and finaly put all
those images in PDF file.

With PIL i can do all the transformations that i want. But i don't
know how i can create from scratch a PDF. I'm not even sure that PIL
is the right library for that.

Any help/informations will be appreciate


From bieffe62 at gmail.com  Mon Feb 23 12:06:25 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 23 Feb 2009 09:06:25 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>

On Feb 23, 5:53?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? I am working on a project where I need to support versions of Python
> as old as 2.3. Previously, we distributed Python with our product, but
> this seemed a bit silly so we are no longer doing this. ?The problem
> that I am faced with is that we have Python scripts that use the
> subprocess module, and subprocess is not available in Python 2.3.
> Below is the strategy I am thinking about using, however if, you have
> better ideas please let me know.
>
> def runner(cmd, stdin, stdout, ...):
> ? try:
> ? ? import subprocess
> ? ? sbm = 1
> ? except:
> ? ? sbm = 0
>
> ? # Now do something
> ? if sbm:
> ? ? process = subporcess(...)
> ? else:
> ? ? import popen2
> ? ? process = popen2.Popen4(...)
>
> Has anyone else run into a situation similar to this one?

IIRC,  subprocess is a pure python module. If so, tou could try if
subprocess compiles under 2.3.
If so, or if it has easily fixable problems, you could rename it as
someting like 'backported_subprocess.py'
and include it in your app, which then should do:

try:
   import subprocess
except ImportError:
   import backported_subprocess as subprocess

This should minimize the change at your code. Of course if the usage
of subprocess is restricted
to few functions, your approach to provide two alternative
implementations of those function
is also workable. However, check if/when the module popen2, which is
deprecated, is planned for
remioval, otherwise you will have the same problem later.

HTH

Ciao
------
FB


From mnordhoff at mattnordhoff.com  Mon Feb 23 12:07:04 2009
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Mon, 23 Feb 2009 17:07:04 +0000
Subject: A tale of two execs
In-Reply-To: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <49A2D7B8.2000106@mattnordhoff.com>

aha wrote:
> Hello All,
>   I am working on a project where I need to support versions of Python
> as old as 2.3. Previously, we distributed Python with our product, but
> this seemed a bit silly so we are no longer doing this.  The problem
> that I am faced with is that we have Python scripts that use the
> subprocess module, and subprocess is not available in Python 2.3.
> Below is the strategy I am thinking about using, however if, you have
> better ideas please let me know.
> 
> def runner(cmd, stdin, stdout, ...):
>   try:
>     import subprocess
>     sbm = 1
>   except:
>     sbm = 0
> 
>   # Now do something
>   if sbm:
>     process = subporcess(...)
>   else:
>     import popen2
>     process = popen2.Popen4(...)
> 
> Has anyone else run into a situation similar to this one?

FWIW, the Mercurial project went the other way: They wrote "popen2",
"popen3" and "Popen3" functions that were wrappers around subprocess:

<http://selenic.com/repo/hg-stable/file/dd970a311ea8/mercurial/util.py#l52>
-- 


From phillip.oldham at gmail.com  Mon Feb 23 12:12:20 2009
From: phillip.oldham at gmail.com (Phillip B Oldham)
Date: Mon, 23 Feb 2009 09:12:20 -0800 (PST)
Subject: Python shell scripting and errors
Message-ID: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>

I've got a python script running as a daemon (using someone else's
daemon module). It runs fine for a while, but will occasionally balk
and die. Since its running in the background, I'm getting no error
from it.

What's the best way to capture the output into a file for later review?


From ethan at stoneleaf.us  Mon Feb 23 12:16:38 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Mon, 23 Feb 2009 09:16:38 -0800
Subject: ANN: Python dBase 0.84.18 released!
Message-ID: <49A2D9F6.2060906@stoneleaf.us>

This module is designed to work with dBase III and Visual FoxPro 6.0 dbf 
files, along with their memo files.  Index files are not supported.

The table header is read into memory, table data is read into memory on 
first record access; field updates are immediately written to disk.

Documentation will be improved as time permits.

Current web location is http://groups.google.com/group/python-dbase.

My apologies for the extremely bare-bones web site.
--
~Ethan~


From tim.wintle at teamrubber.com  Mon Feb 23 12:21:51 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 17:21:51 +0000
Subject: Python shell scripting and errors
In-Reply-To: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
Message-ID: <1235409711.12946.31.camel@tim-laptop>

On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
> I've got a python script running as a daemon (using someone else's
> daemon module). It runs fine for a while, but will occasionally balk
> and die. Since its running in the background, I'm getting no error
> from it.
> 
> What's the best way to capture the output into a file for later review?

Point standard out to an open file handle?



From bieffe62 at gmail.com  Mon Feb 23 12:28:44 2009
From: bieffe62 at gmail.com (bieffe62 at gmail.com)
Date: Mon, 23 Feb 2009 09:28:44 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>
Message-ID: <652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>

On Feb 23, 6:06?pm, bieff... at gmail.com wrote:
> On Feb 23, 5:53?pm, aha <aquil.abdul... at gmail.com> wrote:
>
>
>
>
>
> > Hello All,
> > ? I am working on a project where I need to support versions of Python
> > as old as 2.3. Previously, we distributed Python with our product, but
> > this seemed a bit silly so we are no longer doing this. ?The problem
> > that I am faced with is that we have Python scripts that use the
> > subprocess module, and subprocess is not available in Python 2.3.
> > Below is the strategy I am thinking about using, however if, you have
> > better ideas please let me know.
>
> > def runner(cmd, stdin, stdout, ...):
> > ? try:
> > ? ? import subprocess
> > ? ? sbm = 1
> > ? except:
> > ? ? sbm = 0
>
> > ? # Now do something
> > ? if sbm:
> > ? ? process = subporcess(...)
> > ? else:
> > ? ? import popen2
> > ? ? process = popen2.Popen4(...)
>
> > Has anyone else run into a situation similar to this one?
>
> IIRC, ?subprocess is a pure python module. If so, tou could try if
> subprocess compiles under 2.3.

...

I checked, and, for windows platform subprocess.py uses the modules
mvscrt and _subprocess, which I ham unable to
locate on my windows XP python 2.6 installation. This make the whole
thing harder, even impossible if _subprocess has
been created especially for subprocess.py.

For non-windows platform, subprocess.py seem to use only fairly well-
established module, so there is a chance to backport it.

Ciao again
----------
FB


From tjreedy at udel.edu  Mon Feb 23 12:29:16 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 12:29:16 -0500
Subject: Is there a way to ask a class what its metaclasses are ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
References: <mailman.36.1235041220.11040.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF60E68800F@enbmail01.lsi.com>	<50697b2c0902191258ye5aa478gecaf7b7b097e3eba@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D662@enbmail01.lsi.com>	<50697b2c0902220147y4c8dbf94j1415aae9ee7d640@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D673@enbmail01.lsi.com>	<50697b2c0902220357g762fe390q6535079d42f6afb0@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D685@enbmail01.lsi.com>	<50697b2c0902221211k3be5f797k5f0419179864ae4f@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF659FDEDBD@enbmail01.lsi.com>
Message-ID: <gnumdb$97p$1@ger.gmane.org>

Barak, Ron wrote:
> 

> When I try the following (to see the types of the classes involved):
> 
> #!/usr/bin/env python
> 
> import wx
> from Debug import _line as line
> 
> class CopyAndPaste(object):
>     def __init__(self, *args, **kwargs):
>         super(CopyAndPaste, self).__init__(*args, **kwargs)
>         print line()+". type(wx.Frame):",type(wx.Frame)
>         print line()+". type(object):",type(object)
> 
> I get:
> 
> $ python -u CopyAndPaste.py
> 9. type(wx.Frame): <type 'type'>
> 10. type(object): <type 'type'>
> 
> And I don't understand what it means...

The default metaclass is named 'type'.  It it the class of all builtin 
classes and all user classes (3.0) that do not specify otherwise. 
Behind the scenes, new user classes are created as instances of 'type' 
by the equivalent of 'type(name, bases, class_dict)'.  What is possibly 
confusing is that the __call__ method of 'type' also allows calls to 
type with only one arg, in which case it returns the class of the arg 
instead of trying to create a new class.  And so one might mistakenly 
think that 'type' is a built-in function rather than a class.

Terry Jan Reedy



From philip at semanchuk.com  Mon Feb 23 12:34:53 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 12:34:53 -0500
Subject: Python shell scripting and errors
In-Reply-To: <1235409711.12946.31.camel@tim-laptop>
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
	<1235409711.12946.31.camel@tim-laptop>
Message-ID: <90DA12C5-AC31-4747-AEBA-4952BAFFC02B@semanchuk.com>


On Feb 23, 2009, at 12:21 PM, Tim Wintle wrote:

> On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
>> I've got a python script running as a daemon (using someone else's
>> daemon module). It runs fine for a while, but will occasionally balk
>> and die. Since its running in the background, I'm getting no error
>> from it.
>>
>> What's the best way to capture the output into a file for later  
>> review?
>
> Point standard out to an open file handle?

And stderr.

I don't know how the OP's daemon is being launched, but the crontab  
command below worked for me for redirecting errors to a log file  
without the need to modify the script.

python /usr/local/foo/bar.py >> /var/log/foo/bar.txt 2>&1



HTH
Philip


From steve at holdenweb.com  Mon Feb 23 12:45:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 12:45:57 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <gnuncn$bjh$1@ger.gmane.org>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
> <steven at remove.this.cybersource.com.au> wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>> Except that is wrong. If it were true, you could do this:
>>
>> def swap(x, y):
>>    y, x = x, y
>>
>> a = 1
>> b = 2
>> swap(a, b)
>> assert a == 2 and b == 1
>>
>>
>> but you can't, it does not work. Ergo, parameter passing in Python does
>> not have the same semantics as languages that use pass-by-reference, such
>> as Pascal and Basic. That means that even if you can justify the claim
>> "Python is pass-by-reference" by some technical argument (and I don't
>> believe you can), it is misleading to make that claim without further
>> qualifications.
> 
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable. The objects *do* get passed by
> reference; the function doesn't receive a new copy of the object and
> it can examine the original object's ID. The actual culprit is not the
> way objects are passed but the assignment operator, since it works by
> rebinding names (as Andrew Koenig explained) and not by changing the
> object itself. If the swap() function could somehow access the
> underlying integer object and modify it, swapping of values would
> indeed occur because the function *did* get references to the objects
> passed to it.
> 
> That said, it's a rather convoluted way of explaining what happens and
> calling it pass-by-object feels much better. :-)
> 
The underlying point is that there is no way to rebind names in the
caller's namespace by manipulations of parameters passed as arguments to
a function.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From rdmurray at bitdance.com  Mon Feb 23 12:54:03 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 23 Feb 2009 17:54:03 +0000 (UTC)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com>
Message-ID: <gnunrq$eov$1@ger.gmane.org>

Stef Mientki <stef.mientki at gmail.com> wrote:
> thanks Ron,
> 
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than 
> it is by default.
[snip]
> >> -----Original Message-----
> >> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
[snip]
> >> I often get an error message like this
> >>
> >>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
> >> IndexError: list index out of range
> >>
> >> Now it would be very welcome,
> >> if the error message specified which index is out of range, 
> >> in this case e.g.,
> >> - specifying the length of self.EP
> >> - specifying the value of self.EP[2]
> >> - specifying the length of self.Brick.Par etc..
> >>
> >> Is there a way to override the error message and provide this 
> >> information, or is it impossible ?
> >>
> >> And if it's possible, am I the only one who often stumbles 
> >> about this problem ?
> >> (I expect many people must have bounced in this problem before me ;-)

FYI, top posts are much harder to read and to reply to than if you edit
the message to which you are replying and add your new content interleaved
or at the bottom (as I have done).

No you are not the only one who wishes the error messages were
more informative.  In one complex application I had, I made my life
easier with a hack I copied from Zope.  Briefly, at the top level
of the program I trap all exceptions, get the traceback object from
sys.exc_info, format it with format_tb, and then process it to add info.
I applied several enhancements, but the one relevant to you was to grab
the locals dictionary from the last frame of the traceback, and use a
regex to split the last source line in the formatted traceback up into
candidate variable names.  Then I printed the name and the repr of the
value of any of those names I found in the locals dict.

That wouldn't tell you directly which variable it was threw the index
error, but having the current values of the variables involved saves a
lot of time (no need to go back and stick in prints in many cases).

(You know, I really ought to revisit that routine and make it part
of my standard development toolbox.)

--RDM



From steve at holdenweb.com  Mon Feb 23 12:57:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 12:57:05 -0500
Subject: Server programming
In-Reply-To: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
References: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
Message-ID: <gnuo1j$eil$1@ger.gmane.org>

koranthala wrote:
> Hi,
>       Is server programming in Python procedure oriented or object
> oriented?
>       I have this question because lately I am asked to make a medium
> complex web program (extremely database oriented) using Django. When I
> used to do application programs earlier (in Python itself), the whole
> thing being object oriented came out easily in programming. So, I was
> able to use different patterns etc for programming and the whole thing
> was - quite fun to design and create.
>       But when I program in Django, since I just have to work on user
> responses - everything else being taken care of by Django - only, the
> complete coding has become procedure oriented. It is not kludgy or
> anything, but it doesnt have the nice feeling that we get when we code
> a proper object oriented program.
>       Is my coding in error here? This is infact my first web program,
> so it might be the reason. What does other people find? Does web
> server programming using web frameworks (Django, TurboGears etc) make
> it procedure oriented? If I am in the wrong, it might be due to a
> wrong design or mindset, and I would like to change it.
> 
It's just that Django *seems* procedure-oriented because your views are
written as functions. But they take request objects as arguments and
return response objects as results, so the framework is object-oriented.
Also each model is a class, and querysets eventually yield lists of
instances.

I wouldn't worry too much until Django forces you to do somethign you
really don't want to do ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 13:00:08 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 13:00:08 -0500
Subject: Python Imaging Library (PIL): create PDF from scratch
In-Reply-To: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
Message-ID: <gnuo7a$eil$2@ger.gmane.org>

zelegolas wrote:
> Hi,
> 
> I have some scan generated by SANE and i would like to do some
> transformation (like crop, brightness and resize) and finaly put all
> those images in PDF file.
> 
> With PIL i can do all the transformations that i want. But i don't
> know how i can create from scratch a PDF. I'm not even sure that PIL
> is the right library for that.
> 
PIL is great for graphics, but I use ReportLab's open source stuff (see
www.reportlab.org) for creating PDFs - that's what it was designed for,
and you can easily incorporate your graphics.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Mon Feb 23 13:00:37 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 15:00:37 -0300 (CLST)
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <gnunrq$eov$1@ger.gmane.org>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
Message-ID: <9afda87e04d99d252c989c08ade7699f.squirrel@acooke.dyndns.org>

rdmurray at bitdance.com wrote:
[...]
> (You know, I really ought to revisit that routine and make it part
> of my standard development toolbox.)

please post it....

andrew



From clp2 at rebertia.com  Mon Feb 23 13:02:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 10:02:50 -0800
Subject: opening files with names in non-english characters.
In-Reply-To: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902231002k28b4f2dfs4b4bbf38e569511f@mail.gmail.com>

On Mon, Feb 23, 2009 at 5:51 AM, venutaurus539 at gmail.com
<venutaurus539 at gmail.com> wrote:
> Hi all,
>          I am trying to find the attributes of afile whose name has
> non english characters one like given below. When I try to run my
> python scirpt, it fails giving out an error filename must be in string
> or UNICODE. When i try to copy the name of the file as a strinig, it
> (KOMODO IDE) is not allowing me to save the script saying that it
> cannot convert some of the characters in the current encoding which is
> Western European(CP-1252).
>
> 0010testUnicode_???????????????????? !#$%&'()+,-.
> 0123456789;=@ABCD.txt.txt

(1) How are you entering or retrieving that filename?
(2) Please provide the exact error and Traceback you're getting.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 13:05:55 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:05:55 -0700
Subject: unescape escapes in strings
Message-ID: <gnuoi3$jat$1@news.motzarella.org>


When reading lines of data from a file in the from (no quotes!)

	foo\x20bar

and I assign to a variable in a line line like:

  f = file('infile', 'r')
  for a in f:
     print a

the string is read in as string with the literal characters 'f', 'o' ... 
'x' , '2' ...

as compared to an assignment like:

  a="foo\x20bar"

which is identical to

a="foo bar"

Okay, so far ... I think this is what I want since my program is using 
space characters as delimiters and I'm trying to use the \x20 notation 
to avoid splitting.

But, now the problem. When I finally assign the string with the \x20 to 
a variable the literals are still there. And here I really want them all 
nicely converted to the desired values.

So, the question is: is there an "unescape()" for strings so that 
"foo\x20bar" is converted to "foo bar"????


From google at mrabarnett.plus.com  Mon Feb 23 13:22:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 18:22:51 +0000
Subject: unescape escapes in strings
In-Reply-To: <gnuoi3$jat$1@news.motzarella.org>
References: <gnuoi3$jat$1@news.motzarella.org>
Message-ID: <49A2E97B.4010209@mrabarnett.plus.com>

bvdp wrote:
> 
> When reading lines of data from a file in the from (no quotes!)
> 
>     foo\x20bar
> 
> and I assign to a variable in a line line like:
> 
>  f = file('infile', 'r')
>  for a in f:
>     print a
> 
> the string is read in as string with the literal characters 'f', 'o' ... 
> 'x' , '2' ...
> 
> as compared to an assignment like:
> 
>  a="foo\x20bar"
> 
> which is identical to
> 
> a="foo bar"
> 
> Okay, so far ... I think this is what I want since my program is using 
> space characters as delimiters and I'm trying to use the \x20 notation 
> to avoid splitting.
> 
> But, now the problem. When I finally assign the string with the \x20 to 
> a variable the literals are still there. And here I really want them all 
> nicely converted to the desired values.
> 
> So, the question is: is there an "unescape()" for strings so that 
> "foo\x20bar" is converted to "foo bar"????
> 
 >>> a = r"foo\x20bar"
 >>> print a
foo\x20bar
 >>> a = a.decode("string-escape")
 >>> print a
foo bar



From bnsilinux at gmail.com  Mon Feb 23 13:29:46 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 10:29:46 -0800 (PST)
Subject: Which GROUP to join ?
Message-ID: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>

hello, I have written a parameter driven menuing and screen system for
S-Lang called SLAG.  It is very intuitive and easy to use and was
designed to rapidly build Accounting Applications with.

I am currently working on porting it to Python.

Which DEV group in Python should I join to get help and ask
questions ?


Thanks

Ben Duncan


From robert.kern at gmail.com  Mon Feb 23 13:33:41 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 23 Feb 2009 12:33:41 -0600
Subject: Which GROUP to join ?
In-Reply-To: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
References: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
Message-ID: <gnuq65$n7t$1@ger.gmane.org>

On 2009-02-23 12:29, Ben wrote:
> hello, I have written a parameter driven menuing and screen system for
> S-Lang called SLAG.  It is very intuitive and easy to use and was
> designed to rapidly build Accounting Applications with.
>
> I am currently working on porting it to Python.
>
> Which DEV group in Python should I join to get help and ask
> questions ?

This one. Welcome!

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From kyosohma at gmail.com  Mon Feb 23 13:34:16 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Mon, 23 Feb 2009 10:34:16 -0800 (PST)
Subject: Which GROUP to join ?
References: <b77de9cc-a1b0-48ca-8019-58b612f317c3@r27g2000vbp.googlegroups.com>
Message-ID: <fcdc155e-efca-4889-805d-059c32b03263@r24g2000vbp.googlegroups.com>

On Feb 23, 12:29?pm, Ben <bnsili... at gmail.com> wrote:
> hello, I have written a parameter driven menuing and screen system for
> S-Lang called SLAG. ?It is very intuitive and easy to use and was
> designed to rapidly build Accounting Applications with.
>
> I am currently working on porting it to Python.
>
> Which DEV group in Python should I join to get help and ask
> questions ?
>
> Thanks
>
> Ben Duncan

You don't need to join the dev groups unless you plan to contribute to
their respective projects. For general questions, this is probably the
best place. Most other projects (such as Sqlalchemy, wxPython, django)
have their own specific lists. Join them as needed.

Mike


From bob at mellowood.ca  Mon Feb 23 13:35:35 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:35:35 -0700
Subject: unescape escapes in strings
In-Reply-To: <mailman.535.1235413372.11746.python-list@python.org>
References: <gnuoi3$jat$1@news.motzarella.org>
	<mailman.535.1235413372.11746.python-list@python.org>
Message-ID: <gnuq9n$7gp$1@news.motzarella.org>

MRAB wrote:
> bvdp wrote:
>>
>> When reading lines of data from a file in the from (no quotes!)
>>
>>     foo\x20bar
>>
>> and I assign to a variable in a line line like:
>>
>>  f = file('infile', 'r')
>>  for a in f:
>>     print a
>>
>> the string is read in as string with the literal characters 'f', 'o' 
>> ... 'x' , '2' ...
>>
>> as compared to an assignment like:
>>
>>  a="foo\x20bar"
>>
>> which is identical to
>>
>> a="foo bar"
>>
>> Okay, so far ... I think this is what I want since my program is using 
>> space characters as delimiters and I'm trying to use the \x20 notation 
>> to avoid splitting.
>>
>> But, now the problem. When I finally assign the string with the \x20 
>> to a variable the literals are still there. And here I really want 
>> them all nicely converted to the desired values.
>>
>> So, the question is: is there an "unescape()" for strings so that 
>> "foo\x20bar" is converted to "foo bar"????
>>
>  >>> a = r"foo\x20bar"
>  >>> print a
> foo\x20bar
>  >>> a = a.decode("string-escape")
>  >>> print a
> foo bar
> 

Thanks ... I think in my original testing I tried decode() but it didn't 
work. Testing more ...

  the file has 2 lines:
   foo bar
   foo\x20bar

and the program to read is:
f=file('in', 'r')
for a in f:
     a = a.strip()
     a=a.decode()
     print list(a)

I get:

python read.py
[]
[u'f', u'o', u'o', u' ', u'b', u'a', u'r']
[u'f', u'o', u'o', u'\\', u'x', u'2', u'0', u'b', u'a', u'r']

So, the \x20 is still literal.

Any other ideas??? I suppose I could write a re expression ... but 
surely that is not needed???



From stef.mientki at gmail.com  Mon Feb 23 13:37:17 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 19:37:17 +0100
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <gnunrq$eov$1@ger.gmane.org>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>
	<gnunrq$eov$1@ger.gmane.org>
Message-ID: <49A2ECDD.8040600@gmail.com>

rdmurray at bitdance.com wrote:
> Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>> thanks Ron,
>>
>> but I was looking for a more general solution,
>> in which I don't change the program itself,
>> and where the error messages (in general) become more informative than 
>> it is by default.
>>     
> [snip]
>   
>>>> -----Original Message-----
>>>> From: Stef Mientki [mailto:stef.mientki at gmail.com] 
>>>>         
> [snip]
>   
>>>> I often get an error message like this
>>>>
>>>>     self.Brick.Par [ self.EP[2] ]['FileName'] = filename
>>>> IndexError: list index out of range
>>>>
>>>> Now it would be very welcome,
>>>> if the error message specified which index is out of range, 
>>>> in this case e.g.,
>>>> - specifying the length of self.EP
>>>> - specifying the value of self.EP[2]
>>>> - specifying the length of self.Brick.Par etc..
>>>>
>>>> Is there a way to override the error message and provide this 
>>>> information, or is it impossible ?
>>>>
>>>> And if it's possible, am I the only one who often stumbles 
>>>> about this problem ?
>>>> (I expect many people must have bounced in this problem before me ;-)
>>>>         
>
> FYI, top posts are much harder to read and to reply to than if you edit
> the message to which you are replying and add your new content interleaved
> or at the bottom (as I have done).
>   
??? I read that before, but I can't understand it.
I think that depends totally on the mail reader you use (although I 
don't know any mail reader that scrolls to the bottom).
I use Thunderbird, which opens every message at the top,
so top posting is the best readable for me,
I don't have to scroll (assuming that I know from previous readings the 
content of the previous message).
Replying can be preset in any reader I know just as you like, bottom or top.
So I guess there must be another reason, why some (or maybe even 
everyone except me)  don't prefer top posting.
> No you are not the only one who wishes the error messages were
> more informative.  In one complex application I had, I made my life
> easier with a hack I copied from Zope.  Briefly, at the top level
> of the program I trap all exceptions, get the traceback object from
> sys.exc_info, format it with format_tb, and then process it to add info.
> I applied several enhancements, but the one relevant to you was to grab
> the locals dictionary from the last frame of the traceback, and use a
> regex to split the last source line in the formatted traceback up into
> candidate variable names.  Then I printed the name and the repr of the
> value of any of those names I found in the locals dict.
>
> That wouldn't tell you directly which variable it was threw the index
> error, but having the current values of the variables involved saves a
> lot of time (no need to go back and stick in prints in many cases).
>
> (You know, I really ought to revisit that routine and make it part
> of my standard development toolbox.)
>
>   
well that sound good,
but contains a lot of suggestions with which I'm not familiar.
Could please post some code snippets ?

thanks,
Stef Mientki
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From tjreedy at udel.edu  Mon Feb 23 13:40:39 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 23 Feb 2009 13:40:39 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A272F1.7090004@gmail.com>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com>
Message-ID: <gnuqj6$oob$1@ger.gmane.org>

Stef Mientki wrote:
> thanks Ron,
> 
> but I was looking for a more general solution,
> in which I don't change the program itself,
> and where the error messages (in general) become more informative than 
> it is by default.

Improving error messages is an ongoing project.  I submitted feature request
http://bugs.python.org/issue5353
Improve IndexError messages with actual values

We can only hope someone will get 'bugged' to write a patch.

Terry




From python.list at tim.thechases.com  Mon Feb 23 13:43:44 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 12:43:44 -0600
Subject: Peculiar swap behavior
Message-ID: <49A2EE60.1060300@tim.thechases.com>

I stumbled across this oddity and was hoping folks on the list 
might be able to provide a little understanding:

# swap scalars
 >>> x,y = 1,2
 >>> x,y = y,x
 >>> x,y
(2, 1)

# swap lists
 >>> a,b = [1,2,3],[4,5,6]
 >>> a,b = b,a
 >>> a,b
([4, 5, 6], [1, 2, 3])

# swap list contents...not so much...
 >>> m,n = [1,2,3],[4,5,6]
 >>> m[:],n[:] = n,m
 >>> m,n
([4, 5, 6], [4, 5, 6])


The first two work as expected but the 3rd seems to leak some 
internal abstraction.  It seems to work if I force content-copying:

 >>> m[:],n[:] = n[:],m[:]

or even just

 >>> m[:],n[:] = n,m[:]

but not

 >>> m[:],n[:] = n[:],m

Is this a bug, something Python should smack the programmer for 
trying, or just me pushing the wrong edges? :)

Thanks,

-tkc







From benjamin.kaplan at case.edu  Mon Feb 23 13:49:02 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 23 Feb 2009 13:49:02 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <49A2ECDD.8040600@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
Message-ID: <ec96e1390902231049r7eaf39fco111ed7d6d5839879@mail.gmail.com>

On Mon, Feb 23, 2009 at 1:37 PM, Stef Mientki <stef.mientki at gmail.com>wrote:

> rdmurray at bitdance.com wrote:
>
>>
>> FYI, top posts are much harder to read and to reply to than if you edit
>> the message to which you are replying and add your new content interleaved
>> or at the bottom (as I have done).
>>
>>
> ??? I read that before, but I can't understand it.
> I think that depends totally on the mail reader you use (although I don't
> know any mail reader that scrolls to the bottom).
> I use Thunderbird, which opens every message at the top,
> so top posting is the best readable for me,
> I don't have to scroll (assuming that I know from previous readings the
> content of the previous message).
> Replying can be preset in any reader I know just as you like, bottom or
> top.
> So I guess there must be another reason, why some (or maybe even everyone
> except me)  don't prefer top posting.



It's because of your caveat. Many of us don't remember the exact content of
the threads, especially the complicated ones that result in several
branches. When you post underneath, we can see how the thread progressed as
we scroll down. It makes it easier to follow without digging through all the
other messages.
-------------- next part --------------
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From google at mrabarnett.plus.com  Mon Feb 23 13:49:55 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 18:49:55 +0000
Subject: unescape escapes in strings
In-Reply-To: <gnuq9n$7gp$1@news.motzarella.org>
References: <gnuoi3$jat$1@news.motzarella.org>	<mailman.535.1235413372.11746.python-list@python.org>
	<gnuq9n$7gp$1@news.motzarella.org>
Message-ID: <49A2EFD3.70809@mrabarnett.plus.com>

bvdp wrote:
> MRAB wrote:
>> bvdp wrote:
>>>
>>> When reading lines of data from a file in the from (no quotes!)
>>>
>>>     foo\x20bar
>>>
>>> and I assign to a variable in a line line like:
>>>
>>>  f = file('infile', 'r')
>>>  for a in f:
>>>     print a
>>>
>>> the string is read in as string with the literal characters 'f', 'o' 
>>> ... 'x' , '2' ...
>>>
>>> as compared to an assignment like:
>>>
>>>  a="foo\x20bar"
>>>
>>> which is identical to
>>>
>>> a="foo bar"
>>>
>>> Okay, so far ... I think this is what I want since my program is 
>>> using space characters as delimiters and I'm trying to use the \x20 
>>> notation to avoid splitting.
>>>
>>> But, now the problem. When I finally assign the string with the \x20 
>>> to a variable the literals are still there. And here I really want 
>>> them all nicely converted to the desired values.
>>>
>>> So, the question is: is there an "unescape()" for strings so that 
>>> "foo\x20bar" is converted to "foo bar"????
>>>
>>  >>> a = r"foo\x20bar"
>>  >>> print a
>> foo\x20bar
>>  >>> a = a.decode("string-escape")
>>  >>> print a
>> foo bar
>>
> 
> Thanks ... I think in my original testing I tried decode() but it didn't 
> work. Testing more ...
> 
>  the file has 2 lines:
>   foo bar
>   foo\x20bar
> 
> and the program to read is:
> f=file('in', 'r')
> for a in f:
>     a = a.strip()
>     a=a.decode()

You didn't specify what kind of decoding you want!

>     print list(a)
> 
> I get:
> 
> python read.py
> []
> [u'f', u'o', u'o', u' ', u'b', u'a', u'r']
> [u'f', u'o', u'o', u'\\', u'x', u'2', u'0', u'b', u'a', u'r']
> 
> So, the \x20 is still literal.
> 
> Any other ideas??? I suppose I could write a re expression ... but 
> surely that is not needed???
> 


From darcy at druid.net  Mon Feb 23 13:54:47 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 23 Feb 2009 13:54:47 -0500
Subject: Top posting
In-Reply-To: <49A2ECDD.8040600@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
Message-ID: <20090223135447.184e31bb.darcy@druid.net>

On Mon, 23 Feb 2009 19:37:17 +0100
Stef Mientki <stef.mientki at gmail.com> wrote:
> > FYI, top posts are much harder to read and to reply to than if you edit
> > the message to which you are replying and add your new content interleaved
> >   
> ??? I read that before, but I can't understand it.

It is very simple.  The critical part above is "...edit the
message..."  If you leave a 200 line message in your reply to discuss
three lines then it won't matter whether you top post or bottom post.
You still make it difficult for others to read your posting.

> I use Thunderbird, which opens every message at the top,
> so top posting is the best readable for me,

Only if the previous poster didn't trim their text.  Notice how I have
removed everything here that I am not replying to.  I doubt very much
if you have to scroll down to start reading my response.  You can also
tell at a glance that this is not a "me too" response.

> I don't have to scroll (assuming that I know from previous readings the 
> content of the previous message).

But how do you know what part of the message is being replied to?

> Replying can be preset in any reader I know just as you like, bottom or top.
> So I guess there must be another reason, why some (or maybe even 
> everyone except me)  don't prefer top posting.

Ah, that makes sense.
Because it is not the usual way we read the flow of a conversation.
What is so bad about top posting?

How long did you waste on the above exchange before reversing the lines
in your head?

The bottom line is that thousands of people are reading your reply but
only one (you) is writing it.  It just makes sense for you to take an
extra ten seconds to save thousands of people two seconds reading it.
It is polite and considerate to others.  If everyone did the same you
would also save because you read many more posts than you write.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From bob at mellowood.ca  Mon Feb 23 13:55:04 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 11:55:04 -0700
Subject: unescape escapes in strings
In-Reply-To: <mailman.541.1235414996.11746.python-list@python.org>
References: <gnuoi3$jat$1@news.motzarella.org>	<mailman.535.1235413372.11746.python-list@python.org>	<gnuq9n$7gp$1@news.motzarella.org>
	<mailman.541.1235414996.11746.python-list@python.org>
Message-ID: <gnure9$lml$1@news.motzarella.org>


Perfect ... thanks.

>>>  >>> a = a.decode("string-escape")

Using "string-escape" does the trick!

Wonderful, this python. And the quick answers on this group.



From bnsilinux at gmail.com  Mon Feb 23 13:55:52 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 10:55:52 -0800 (PST)
Subject: Which group ...
Message-ID: <17470b68-f175-4ab8-99de-e51560a8e86e@s14g2000vbp.googlegroups.com>

Ok, thanks ... I am going to be asking a lot of questions now ;->


From lists at cheimes.de  Mon Feb 23 14:08:44 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:08:44 +0100
Subject: A tale of two execs
In-Reply-To: <652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>	<4e5f94f2-2707-4a4d-b48b-b97759225bef@j35g2000yqh.googlegroups.com>
	<652cdc53-584d-49ca-891c-350465fe9ebf@u38g2000yqe.googlegroups.com>
Message-ID: <gnus7s$3ou$1@ger.gmane.org>

bieffe62 at gmail.com wrote
> I checked, and, for windows platform subprocess.py uses the modules
> mvscrt and _subprocess, which I ham unable to
> locate on my windows XP python 2.6 installation. This make the whole
> thing harder, even impossible if _subprocess has
> been created especially for subprocess.py.

Some modules are built into pythonXX.dll. You won't find them in the
file system.

The subprocess module either requires _subprocess or it can be switched
to pywin32. Check out the head of the file!

Christian



From lists at cheimes.de  Mon Feb 23 14:10:12 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:10:12 +0100
Subject: A tale of two execs
In-Reply-To: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
Message-ID: <gnusak$3ou$2@ger.gmane.org>

aha wrote
> def runner(cmd, stdin, stdout, ...):
>   try:
>     import subprocess
>     sbm = 1
>   except:
>     sbm = 0
> 
>   # Now do something
>   if sbm:
>     process = subporcess(...)
>   else:
>     import popen2
>     process = popen2.Popen4(...)
> 
> Has anyone else run into a situation similar to this one?

The canonical way for your try/except clause is:

try:
    import subprocess
except ImportError:
    subprocess = None

...

if subprocess is not None:
    ...
else:
    ...

Christian



From Scott.Daniels at Acm.Org  Mon Feb 23 14:11:33 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Mon, 23 Feb 2009 11:11:33 -0800
Subject: Python Imaging Library (PIL): create PDF from scratch
In-Reply-To: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
Message-ID: <MPqdnRO40I7QaT_UnZ2dnUVZ_sjinZ2d@pdx.net>

zelegolas wrote:
> Hi,
> 
> I have some scan generated by SANE and i would like to do some
> transformation (like crop, brightness and resize) and finaly put all
> those images in PDF file.
> 
> With PIL i can do all the transformations that i want. But i don't
> know how i can create from scratch a PDF. I'm not even sure that PIL
> is the right library for that.
> 
> Any help/informations will be appreciate

Use PIL to fiddle the individual images, and reportlab to build
a pdf from the (now tweaked) images.

--Scott David Daniels
Scott.Daniels at Acm.Org


From yatsek at gmail.com  Mon Feb 23 14:11:57 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 11:11:57 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
Message-ID: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python, connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep


s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )


            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send something
                    #self.send_header('Content-type',	'text/plain')
                    self.send_header('Content-type',	'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data' action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek


From bnsilinux at gmail.com  Mon Feb 23 14:13:41 2009
From: bnsilinux at gmail.com (Ben)
Date: Mon, 23 Feb 2009 11:13:41 -0800 (PST)
Subject: Extending Python Questions .....
Message-ID: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>

Ok... Now I can start asking.

In My S-Lag Project called, SLAG, I have some function keys that get
mapped back to S-lang internal functions.

My SLAG project works pretty much like Python (as does the S-Lang).
You write a S-lang script
that "imports" your extension. module - and all this gets run by the
shell/interpreter.

I allow function keys to be mapped back internal function(s) inside of
the controlling program.

My question is which Python C api Do I need to this with ? Do I need
to worry about my reference counting since the Python Program is in
essence calling a function in itself?

Thanks

Ben ...


From yatsek at gmail.com  Mon Feb 23 14:13:46 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 11:13:46 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
Message-ID: <3abda581-de7b-49cc-8f13-bfb85c483ee4@q18g2000vbn.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python,
connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep

s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )

            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send
something
                    #self.send_header('Content-type',   'text/plain')
                    self.send_header('Content-type',    'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data'
action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above
server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek


From sternbrightblade at gmail.com  Mon Feb 23 14:15:39 2009
From: sternbrightblade at gmail.com (Tony)
Date: Mon, 23 Feb 2009 11:15:39 -0800
Subject: different errors, return outside function and others
In-Reply-To: <op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>
References: <ec06466f0902222251y6279cbb5h667fbca48527ac73@mail.gmail.com>
	<op.upsplbtbx6zn5v@gabriel.sleipnir-bsas>
	<ec06466f0902230107td9f7363jd9cbdda7179e70e5@mail.gmail.com>
	<op.upstxsm2x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <ec06466f0902231115ra335d70hddba96ee67297354@mail.gmail.com>

Thank You, I now understand what i need to do now, and again Thanks

On Mon, Feb 23, 2009 at 1:57 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Mon, 23 Feb 2009 07:07:57 -0200, Tony <sternbrightblade at gmail.com>
> escribi?:
>
> ok thank you for that input, this is my first class in programming and its
>> the only one the school offers. im pretty sure those are supposed to be
>> modules
>> that im writting. would it make a difference if those were modules and not
>> functions? kinda stupid question there but im trying to learn as much as
>> possible.
>>
>
> Each module is a separate file, with extension .py
> If you put all your code in a single file, you write a single module.
> That's fine in this case, unless it grows to something unmanageable.
>
> Functions are blocks of code that have a name and "do" something specific,
> and usually return some result. They start with the keyword "def". You have
> defined several functions already, but called them "modules" in the
> comments, that's wrong and may be confusing.
>
> Also anything with def infront of it example def start(): would be a
>> function correct? also im Using 2.5 and the IDLE to do this
>>
>
> Exactly!
>
> I think you have written so much code without testing it. It's time to test
> every piece now. Start with... the start function, obviously!
>
> But before, you have to clean your code. There are a few strange lines that
> should not be there (all those lines on the left margin that aren't "def"
> statements, like intro_area(), alley()...). Just remove or comment them.
>
> Then you can start testing each function, one at a time. Simply call the
> function with the desired parameters (if any), right at the bottom of the
> file. To test the first one (start), use something like this:
>
> print "about to call start()"
> result = start()
> print "start() finished, result=", result
>
> and do the same for each individual function. Once you know each piece
> works fine, you can start combining them until you build the complete
> program.
>
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bblais at bryant.edu  Mon Feb 23 14:17:04 2009
From: bblais at bryant.edu (Brian Blais)
Date: Mon, 23 Feb 2009 14:17:04 -0500
Subject: Reference or Value?
In-Reply-To: <op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <6D420E20-FFC0-407B-ADCD-10D541E8C3CA@bryant.edu>

On Feb 23, 2009, at 3:03 , Gabriel Genellina wrote:

> En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak  
> <denis.kasak at gmail.com> escribi?:
>
>> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
>> <steven at remove.this.cybersource.com.au> wrote:
>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>
>>>> as far as i understand things, the best model is:
>>>>
>>>> 1 - everything is an object
>>>> 2 - everything is passed by reference
>>>
>>> Except that is wrong. If it were true, you could do this:
>>>
>>> def swap(x, y):
>>>    y, x = x, y
>>>
>>> a = 1
>>> b = 2
>>> swap(a, b)
>>> assert a == 2 and b == 1
>>>
>>>
>>> but you can't, it does not work. Ergo, parameter passing in  
>>> Python does
>>> not have the same semantics as languages that use pass-by- 
>>> reference, such
>>> as Pascal and Basic. That means that even if you can justify the  
>>> claim
>>> "Python is pass-by-reference" by some technical argument (and I  
>>> don't
>>> believe you can), it is misleading to make that claim without  
>>> further
>>> qualifications.
>>
>> You could, however, argue that the swap function doesn't work as
>> expected (e.g. from a Pascal or a C++ POV) simply because the
>> underlying objects aren't mutable.
>
> That's irrelevant - mutable and immutable objects are passed  
> exactly the same way.
>

I don't think they were saying that mutable and immutable objects  
were handled differently.  They are different in terms of what a  
function can do to them (mutate them or no). Thus, if you can't  
mutate them, then the caller can't see any changes in the objects by  
actions in the function so the swap won't work: it doesn't mutate the  
objects at all.  In the case of a list or a dict, then one can mutate  
them, and the changes are seen in the caller.  In both cases, the  
object itself is passed the same way.


			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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From adleslie at gmail.com  Mon Feb 23 14:17:42 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 11:17:42 -0800 (PST)
Subject: python sql query in django
Message-ID: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>

I have three tables:

class Technology(models.Model):
    technology = models.CharField(max_length=100, null=True,
blank=True )
    def __unicode__(self):
        return self.technology
    class Meta:
        ordering = ["technology"]

class Publication(models.Model):
    pubtitle = models.TextField(null=True, blank=True)
def __unicode__(self):
        return self.pubtitle
    class Meta:
        ordering = ["pubtitle"]

class Techpubcombo(models.Model):
    technology = models.ForeignKey(Technology)
    publication = models.ForeignKey(Publication)

The user selects a technology from the drop down menu on the web
page.  The technology is retrieved
from the database table and then it must be used to retrieve the
publication attributes, by first going through the Techpubcombo table.

I wrote the select to retrieve the data for the html drop down box:
    technology_list = Technology.objects.all().order_by('technology')

After the user makes a selection, the technology_id is retrieved:
  technology_id = request.POST['technology_id']
    t = get_object_or_404(Technology, pk=technology_id)

Now I need to use the technology_id to get to the publication
attributes

This is where I'm stuck.

I get error messages when I try to do something like:

pub=t.techpubcombo.publications_set()

Ana


From woodygar at sky.com  Mon Feb 23 14:22:16 2009
From: woodygar at sky.com (Gary Wood)
Date: Mon, 23 Feb 2009 19:22:16 -0000
Subject: Can someone tell me why i get None at the end please this has me
	stuck for ages 
Message-ID: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>

'''exercise to complete and test this function'''
import string
def joinStrings(items):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
    word = [items]
    for item in items:
         print (item, end='')
   
    
def main():
    print(joinStrings(['very', 'hot','day']))
    print(joinStrings(['this', 'is','it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()

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From lionel.keene at gmail.com  Mon Feb 23 14:24:46 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 23 Feb 2009 11:24:46 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com> 
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com> 
	<mailman.408.1235205469.11746.python-list@python.org>
Message-ID: <da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>

On Feb 21, 12:37?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.ke... at gmail.com> ?
> escribi?:
>
> > Okay, moving the wx example into the same directory containing the
> > first example that was working fixed it. This directory only contains
> > these two modules and nothing else. The old directory which contained
> > the example that wasn't working did not contain a module with the same
> > name as the one I was trying to import, so i don't know why this "fix"
> > worked.
>
> Just play safe:
>
> - Don't use "from xxx import *", least from two places at the same time. ?
> The wx package has a short name on purpose - use "import wx" and then ?
> wx.Frame, etc.
>
> - Don't play with sys.path if you don't have to; you can put your own ?
> modules in a place already listed (like Lib\site-packages). Or, use a .pth ?
> file if you want to add a copmletely separate directory like ?
> c:\DataFileTypes
>
> --
> Gabriel Genellina

Okay, I've moved the module directory. Originally I had a Python
module named "DataFileTypes.py" in the "C:\DataFileTypes" folder. (the
complete path is therefore "C:\DataFileTypes\DataFileTypes.py"). To
access object types in this module from other Pyhton modules I
specified the following:


import sys
sys.path.append("C:\DataFileTypes")
from DataFileTypes import *


The above 3 lines of code are contained at the begining of a module
whose complete path is "C:\Python path test\Test.py".  This folder
only contains this module and two other unrelated python files I've
written. At the moment this works fine i.e. Python is able to find the
DataFileTypes.py module at its location using the "sys.path.append /
import" statements above. However, now I've moved the "DataFileTypes"
folder containing the module so that the new complete path is:

"C:\Python25\Lib\site-packages\DataFileTypes\DataFileTypes.py"

At this point I print the sys.path from the Python shell:

IDLE 1.2.4
>>> import sys
>>> print sys.path
['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
\site-packages', 'C:\\Python25\\lib\\site-packages\\wx-2.8-msw-
unicode']
>>>

"...\site-packages" is indeed listed on the path. I now remove:

import sys
sys.path.append("c:\DataFileTypes")
from DataFileTypes import *

from the invoking module and replace it with:

from DataFileTypes import *

When I attempt to run the Test.py program after these changes I get
error messages claiming:

"except DataFileError:
NameError: name 'DataFileError' is not defined"

I get an error again claiming that my custom exception "DataFileError"
declared in "DataFileTypes" is not defined. Why does this work fine
when I have my module in the root directory and append the sys.path,
but stops working when I put the module in another directory already
resident in the sys.path?





From rob.clewley at gmail.com  Mon Feb 23 14:26:18 2009
From: rob.clewley at gmail.com (Rob Clewley)
Date: Mon, 23 Feb 2009 14:26:18 -0500
Subject: Can someone tell me why i get None at the end please this has me 
	stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <a749952d0902231126r5f981724n91e22b7ee35a62e1@mail.gmail.com>

You get None b/c that's what's being returned from your join strings
function. Your function already prints out the result and doesn't
return the joined strings a your usage case expects.

So either return the joined strings from your function and don't print
them inside the function, or vice versa. Besides, can't you just use

print "".join(list_of_strings)

?

On Mon, Feb 23, 2009 at 2:22 PM, Gary Wood <woodygar at sky.com> wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>
>
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()
>


From marduk at letterboxes.org  Mon Feb 23 14:27:25 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Mon, 23 Feb 2009 14:27:25 -0500
Subject: Can someone tell me why i get None at the end please this has
	me stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <1235417245.27041.2.camel@localhost.localdomain>

On Mon, 2009-02-23 at 19:22 +0000, Gary Wood wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>    
>     
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>  
> main()

Your function, joinStrings() doesn't return a value. In Python a
function that doesn't return a value explicitly returns None by default.

So your print statements in main() will all print None.



From stef.mientki at gmail.com  Mon Feb 23 14:29:42 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 20:29:42 +0100
Subject: Top posting
In-Reply-To: <20090223135447.184e31bb.darcy@druid.net>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>
	<20090223135447.184e31bb.darcy@druid.net>
Message-ID: <49A2F926.5010207@gmail.com>

I agree that top posting on a message like this is not very convenient,
but for simple messages ...

D'Arcy J.M. Cain wrote:
> On Mon, 23 Feb 2009 19:37:17 +0100
> Stef Mientki <stef.mientki at gmail.com> wrote:
>   
>>> FYI, top posts are much harder to read and to reply to than if you edit
>>> the message to which you are replying and add your new content interleaved
>>>   
>>>       
>> ??? I read that before, but I can't understand it.
>>     
>
> It is very simple.  The critical part above is "...edit the
> message..."  If you leave a 200 line message in your reply to discuss
> three lines then it won't matter whether you top post or bottom post.
> You still make it difficult for others to read your posting.
>
>   
I think not the way in which the result is reached, but the result 
itself is important,
and i like to get to the result as fast as possible.
That's why in simple messages, I find top posting is more convenient.
Version history is often (always?) written in reversed chronological order,
you're only interested in the few last ones.
>> I use Thunderbird, which opens every message at the top,
>> so top posting is the best readable for me,
>>     
>
> Only if the previous poster didn't trim their text.  Notice how I have
> removed everything here that I am not replying to.  I doubt very much
> if you have to scroll down to start reading my response.  You can also
> tell at a glance that this is not a "me too" response.
>   
Trimming is very useful and it's done too little.
If you read mail by gmail (which I also do),
you would love that everyone top posts (as you very fast open/close 
messages and see the top of the messages without scrolling)

>   
>> I don't have to scroll (assuming that I know from previous readings the 
>> content of the previous message).
>>     
>
> But how do you know what part of the message is being replied to?
>   
simple messages, 1 issue ?
>   
>> Replying can be preset in any reader I know just as you like, bottom or top.
>> So I guess there must be another reason, why some (or maybe even 
>> everyone except me)  don't prefer top posting.
>>     
>
> Ah, that makes sense.
> Because it is not the usual way we read the flow of a conversation.
> What is so bad about top posting?
>
> How long did you waste on the above exchange before reversing the lines
> in your head?
>   
I do it already more than 10 years, and I mean that !!
When I write a report, almost nobody is interested in all 
investigations, arguments,
most are only interested in the conclusion and is therefor always on top.
By not top-posting on simple messages,
we stick to the middle ages and prevent development of new ideas.
> The bottom line is that thousands of people are reading your reply but
> only one (you) is writing it.  It just makes sense for you to take an
> extra ten seconds to save thousands of people two seconds reading it.
> It is polite and considerate to others.  If everyone did the same you
> would also save because you read many more posts than you write.
>
>   
If it's considered polite, I will try to best next time I post to this 
group.
But I'm not convinced that it saves time for anyone.

btw, it's also polite (in some cultures) to sign your messages ;-)

( I don't want to start a flame war, so this is my last response to this 
thread)

cheers,
Stef Mientki






From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 14:31:15 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 20:31:15 +0100
Subject: python sql query in django
In-Reply-To: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
Message-ID: <49a3071a$0$18735$426a34cc@news.free.fr>

May a ?crit :
> I have three tables:

Actually - from Python's code POV - three Model classes. And actually, 
since there's a very active, friendly and helpful django group on 
googlegroups, you'd be better reposting your question there.

(snip Django's ORM related question)


From joshua at joshuakugler.com  Mon Feb 23 14:33:45 2009
From: joshua at joshuakugler.com (Joshua Kugler)
Date: Mon, 23 Feb 2009 10:33:45 -0900
Subject: urllib2 login help
References: <4612e1c1-3e1e-48ee-9780-312fff074bad@i38g2000yqd.googlegroups.com>
Message-ID: <gnutmq$7qh$1@ger.gmane.org>

You also might want to look at http://wwwsearch.sourceforge.net/mechanize/ 
It will do most of the hard stuff for you (sending form elements, keeping
track of cookies, etc.).

j

john.weatherwax at gmail.com wrote:

> Hello,
> 
> I'm having trouble using urllib2 (maybe) when trying to log into a web
> site that requires a user to enter a login name and a password
> (authentication).  I've tried many things but none seem to work and
> have become stuck recently and was hoping to get a hint from those
> much more knowledgeable than myself.
> 
> I want to automate logging on to the investopedia stock simulator web
> site.
> 
> http://simulator.investopedia.com/authorization/login.aspx
> 
> I can't seem to automate this successfully.
> 
> My python script is below:
> 
> import os,re
> import urllib, urllib2
> 
> theurl = "http://simulator.investopedia.com/authorization/login.aspx"
> 
> post_dict = { "ct100$MainPlaceHolder$usernameText": "XXX",
> "ct100$MainPlaceHolder$passwordText": "XXX", "ct100$MainPlaceHolder
> $loginButton": "Sign In", "ct100$MainPlaceHolder$rememberMeCheckBox":
> "on" }
> 
> post_data = urllib.urlencode( post_dict )
> 
> headers = { 'User-agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
> NT)',
>             'Host': 'simulator.investopedia.com',
>             'Referer': 'http://simulator.investopedia.com/
> authorization/login.aspx',
>             }
> 
> req = urllib2.Request( theurl, post_data, headers )
> response = urllib2.urlopen(req)
> the_page = response.read()
> 
> The problem is that this page returned seems to be the same as the
> login page which I connected to initially.  When I perform the login
> process manually things work as expected.  What am I doing
> incorrectly?
> 
> *ANY* hints/suggestions/directions would be very appreciated since
> I've run out of ideas of things to try at this point.
> 
> Thanks very much
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list




From lists at cheimes.de  Mon Feb 23 14:41:42 2009
From: lists at cheimes.de (Christian Heimes)
Date: Mon, 23 Feb 2009 20:41:42 +0100
Subject: Reference or Value?
In-Reply-To: <39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
Message-ID: <gnuu5m$beu$1@ger.gmane.org>

Denis Kasak wrote
> You could, however, argue that the swap function doesn't work as
> expected (e.g. from a Pascal or a C++ POV) simply because the
> underlying objects aren't mutable. The objects *do* get passed by
> reference; 

We are getting down the same road every couple of months. Please don't
explain Python's calling system with terms like "call by reference".
It's plain simple wrong. The correct term is "call by sharing" or "call
by object reference" although I myself don't use the latter term because
it sounds too much like "call by reference". Every time somebody tries
to explain Python with "call by reference", the person is confusing
himself and others.

Christian



From david.birdsong at gmail.com  Mon Feb 23 14:49:03 2009
From: david.birdsong at gmail.com (birdsong)
Date: Mon, 23 Feb 2009 11:49:03 -0800 (PST)
Subject: Python shell scripting and errors
References: <0b33c75d-807b-4a64-acec-4c6486893552@l22g2000vba.googlegroups.com>
	<1235409711.12946.31.camel@tim-laptop>
	<mailman.528.1235410499.11746.python-list@python.org>
Message-ID: <96c8cd5f-7b26-4c81-9b80-b80e9c70aaef@j8g2000yql.googlegroups.com>

On Feb 23, 9:34?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Feb 23, 2009, at 12:21 PM, Tim Wintle wrote:
>
> > On Mon, 2009-02-23 at 09:12 -0800, Phillip B Oldham wrote:
> >> I've got a python script running as a daemon (using someone else's
> >> daemon module). It runs fine for a while, but will occasionally balk
> >> and die. Since its running in the background, I'm getting no error
> >> from it.
>
> >> What's the best way to capture the output into a file for later ?
> >> review?
>
> > Point standard out to an open file handle?
>
> And stderr.
>
> I don't know how the OP's daemon is being launched, but the crontab ?
> command below worked for me for redirecting errors to a log file ?
> without the need to modify the script.
>
> python /usr/local/foo/bar.py >> /var/log/foo/bar.txt 2>&1

If the daemon module is worth it's salt, it will have probably closed
all open filehandles including STDOUT and STDERR.  So this might not
work.

If all you want is some temporary debugging, add some redirection for
stdout and stderr after you daemonize.

import sys
sys.stderr = open('/path/to/suitable_stderr_file', 'w')
sys.stdout = open('/path/to/suitable_stdout_file', 'w')


I'm pretty sure this should catch any tracebacks.

>
> HTH
> Philip



From denis.kasak at gmail.com  Mon Feb 23 14:58:42 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 20:58:42 +0100
Subject: Reference or Value?
In-Reply-To: <gnuu5m$beu$1@ger.gmane.org>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<gnuu5m$beu$1@ger.gmane.org>
Message-ID: <39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>

On Mon, Feb 23, 2009 at 8:41 PM, Christian Heimes <lists at cheimes.de> wrote:
> Denis Kasak wrote
>> You could, however, argue that the swap function doesn't work as
>> expected (e.g. from a Pascal or a C++ POV) simply because the
>> underlying objects aren't mutable. The objects *do* get passed by
>> reference;
>
> We are getting down the same road every couple of months. Please don't
> explain Python's calling system with terms like "call by reference".
> It's plain simple wrong. The correct term is "call by sharing" or "call
> by object reference" although I myself don't use the latter term because
> it sounds too much like "call by reference". Every time somebody tries
> to explain Python with "call by reference", the person is confusing
> himself and others.

I assure you I am not confused about Python's object model / calling
system. I was arguing, from a purely theoretical standpoint, that the
same system Python uses could be described in terms of
call-by-reference with some additional constraints. I am by no means
arguing that this is a good way of explaining it or trying to explain
it to someone in terms of call-by-reference. I just don't think it's
"plain simple wrong", just confusing and suboptimal.

-- 
Denis Kasak


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 15:02:22 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 21:02:22 +0100
Subject: Server programming
In-Reply-To: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
References: <a47429db-2ddd-4c00-afe4-5ff720ee93ce@f3g2000yqf.googlegroups.com>
Message-ID: <49a30e64$0$20701$426a74cc@news.free.fr>

koranthala a ?crit :
> Hi,
>       Is server programming in Python procedure oriented or object
> oriented?

It's how you want it to be.

>       I have this question because lately I am asked to make a medium
> complex web program (extremely database oriented) using Django. When I
> used to do application programs earlier (in Python itself),  the whole
> thing being object oriented came out easily in programming. So, I was
> able to use different patterns etc for programming and the whole thing
> was - quite fun to design and create.
>       But when I program in Django, since I just have to work on user
> responses - everything else being taken care of by Django - only, the
> complete coding has become procedure oriented. It is not kludgy or
> anything, but it doesnt have the nice feeling that we get when we code
> a proper object oriented program.

So you may want to learn to enjoy the nice feeling we get when we code a 
proper procedural program - or a proper functional one FWIW !-)

There's nothing inherently wrong with procedural programming. Nor with a 
mix of procedural, OO and functional code - which is usually the case in 
Python. It's just a matter of using the right tool for the problem to 
solve.

>       Is my coding in error here?

Don't know - I don't have access to your code. But my experience with 
Django is that I tend to have quite a lot of code in models and 
templatetags, and much less in the views themselves. So I wouldn't say 
that "Django takes care of everything else". If you really ends up 
writing pages upon pages of repeting procedural code in your views and 
nothing in the other parts of the app, then yes, there might be 
something wrong - probably a case of AnemicDomainModel, and possibly a 
lack of knowledge of the whole framework. One of the reasons views are 
usually implemented as functions is that in most cases, you shouldn't 
have a need for more. FWIW, you sometimes don't even need to write a 
specific view - Django's GenericViews can handle quite a lot of cases

Note also that Django doesn't _require_ that you use functions as view 
handlers - any callable object will do. But given how the HTTP protocol 
works and how Django is designed, there's more often than not just no 
*need* for a custom callable object.

And finally, as Steve already mentioned, OO is first about objects, and 
that's what you're dealing with in your views - request objects, session 
objects, model objects etc...

> This is infact my first web program,
> so it might be the reason. What does other people find? Does web
> server programming using web frameworks (Django, TurboGears etc) make
> it procedure oriented?

Not necessarily, no. Some frameworks requires your request handlers to 
be methods of classes FWIW, and nothing in Django prevents you from 
doing so if you want.

> If I am in the wrong, it might be due to a
> wrong design or mindset, and I would like to change it.




From steve at holdenweb.com  Mon Feb 23 15:03:58 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:03:58 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
Message-ID: <gnuvfg$ejq$1@ger.gmane.org>

yatsek at gmail.com wrote:
> Hi there.
[...]

Yatsek:

You just "hijacked a thread" by writing your question as a reply to
somebody else's post. Be aware that a lot of newsreaders will show it as
a part of this other thread rather than giving if a thread of its own,
and so many people (who may have skimmed over the other thread) won't
see your post!

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lionel.keene at gmail.com  Mon Feb 23 15:10:07 2009
From: lionel.keene at gmail.com (Lionel)
Date: Mon, 23 Feb 2009 12:10:07 -0800 (PST)
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com> 
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com> 
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
Message-ID: <02ed27ed-4b4f-41b2-b4b8-7914d3f13674@v39g2000yqm.googlegroups.com>

On Feb 23, 11:24?am, Lionel <lionel.ke... at gmail.com> wrote:
> On Feb 21, 12:37?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>
>
>
>
>
> > En Fri, 20 Feb 2009 22:40:03 -0200, Lionel <lionel.ke... at gmail.com> ?
> > escribi?:
>
> > > Okay, moving the wx example into the same directory containing the
> > > first example that was working fixed it. This directory only contains
> > > these two modules and nothing else. The old directory which contained
> > > the example that wasn't working did not contain a module with the same
> > > name as the one I was trying to import, so i don't know why this "fix"
> > > worked.
>
> > Just play safe:
>
> > - Don't use "from xxx import *", least from two places at the same time. ?
> > The wx package has a short name on purpose - use "import wx" and then ?
> > wx.Frame, etc.
>
> > - Don't play with sys.path if you don't have to; you can put your own ?
> > modules in a place already listed (like Lib\site-packages). Or, use a .pth ?
> > file if you want to add a copmletely separate directory like ?
> > c:\DataFileTypes
>
> > --
> > Gabriel Genellina
>
> Okay, I've moved the module directory. Originally I had a Python
> module named "DataFileTypes.py" in the "C:\DataFileTypes" folder. (the
> complete path is therefore "C:\DataFileTypes\DataFileTypes.py"). To
> access object types in this module from other Pyhton modules I
> specified the following:
>
> import sys
> sys.path.append("C:\DataFileTypes")
> from DataFileTypes import *
>
> The above 3 lines of code are contained at the begining of a module
> whose complete path is "C:\Python path test\Test.py". ?This folder
> only contains this module and two other unrelated python files I've
> written. At the moment this works fine i.e. Python is able to find the
> DataFileTypes.py module at its location using the "sys.path.append /
> import" statements above. However, now I've moved the "DataFileTypes"
> folder containing the module so that the new complete path is:
>
> "C:\Python25\Lib\site-packages\DataFileTypes\DataFileTypes.py"
>
> At this point I print the sys.path from the Python shell:
>
> IDLE 1.2.4>>> import sys
> >>> print sys.path
>
> ['C:\\Python25\\Lib\\idlelib', 'C:\\WINDOWS\\system32\\python25.zip',
> 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-
> win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\
> \site-packages', 'C:\\Python25\\lib\\site-packages\\wx-2.8-msw-
> unicode']
>
>
>
> "...\site-packages" is indeed listed on the path. I now remove:
>
> import sys
> sys.path.append("c:\DataFileTypes")
> from DataFileTypes import *
>
> from the invoking module and replace it with:
>
> from DataFileTypes import *
>
> When I attempt to run the Test.py program after these changes I get
> error messages claiming:
>
> "except DataFileError:
> NameError: name 'DataFileError' is not defined"
>
> I get an error again claiming that my custom exception "DataFileError"
> declared in "DataFileTypes" is not defined. Why does this work fine
> when I have my module in the root directory and append the sys.path,
> but stops working when I put the module in another directory already
> resident in the sys.path?- Hide quoted text -
>
> - Show quoted text -

Taking "DataFileTypes.py" module out of the "...\site-packages
\DataFileTypes" folder and placing it directly into the "site-
packages" folder seems to have cleared it up. Some problem between
package and module usage I suppose.


From steve at holdenweb.com  Mon Feb 23 15:12:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:12:05 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	<mailman.464.1235320654.11746.python-list@python.org>	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>	<gnuu5m$beu$1@ger.gmane.org>
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
Message-ID: <gnuvun$hlf$1@ger.gmane.org>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 8:41 PM, Christian Heimes <lists at cheimes.de> wrote:
>> Denis Kasak wrote
>>> You could, however, argue that the swap function doesn't work as
>>> expected (e.g. from a Pascal or a C++ POV) simply because the
>>> underlying objects aren't mutable. The objects *do* get passed by
>>> reference;
>> We are getting down the same road every couple of months. Please don't
>> explain Python's calling system with terms like "call by reference".
>> It's plain simple wrong. The correct term is "call by sharing" or "call
>> by object reference" although I myself don't use the latter term because
>> it sounds too much like "call by reference". Every time somebody tries
>> to explain Python with "call by reference", the person is confusing
>> himself and others.
> 
> I assure you I am not confused about Python's object model / calling
> system. I was arguing, from a purely theoretical standpoint, that the
> same system Python uses could be described in terms of
> call-by-reference with some additional constraints. I am by no means
> arguing that this is a good way of explaining it or trying to explain
> it to someone in terms of call-by-reference. I just don't think it's
> "plain simple wrong", just confusing and suboptimal.
> 
Well, what's the benefit of discussing such a description, then?
Regulars on c.l.py see this subject arising so regularly it's a bit like
"there's nothing new under the sun". Honestly, it's been discussed /ad
nauseam/ lately.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Mon Feb 23 15:18:16 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 21:18:16 +0100
Subject: Extending Python Questions .....
In-Reply-To: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
Message-ID: <70gek8F5ep0jU1@mid.uni-berlin.de>

Ben schrieb:
> Ok... Now I can start asking.
> 
> In My S-Lag Project called, SLAG, I have some function keys that get
> mapped back to S-lang internal functions.
> 
> My SLAG project works pretty much like Python (as does the S-Lang).
> You write a S-lang script
> that "imports" your extension. module - and all this gets run by the
> shell/interpreter.
> 
> I allow function keys to be mapped back internal function(s) inside of
> the controlling program.
> 
> My question is which Python C api Do I need to this with ? Do I need
> to worry about my reference counting since the Python Program is in
> essence calling a function in itself?


What's S-Lag? What is S-Lang?

I'm sure I can google that, however I think you might want to provide a 
bit more context yourself to receive better answers.

Diez


From wolfgang at rohdewald.de  Mon Feb 23 15:26:54 2009
From: wolfgang at rohdewald.de (Wolfgang Rohdewald)
Date: Mon, 23 Feb 2009 21:26:54 +0100
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <gnuvfg$ejq$1@ger.gmane.org>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
	<gnuvfg$ejq$1@ger.gmane.org>
Message-ID: <200902232126.54519.wolfgang@rohdewald.de>

On Montag, 23. Februar 2009, Steve Holden wrote:
> yatsek at gmail.com wrote:
> > Hi there.
> [...]
> 
> Yatsek:
> 
> You just "hijacked a thread" by writing your question as a reply to
> somebody else's post

did he? His mail headers show no reference to any other mail AFAICS

-- 
Wolfgang


From nick at craig-wood.com  Mon Feb 23 15:31:54 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Mon, 23 Feb 2009 14:31:54 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
Message-ID: <slrngq611k.c4u.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  In My S-Lag Project called, SLAG, I have some function keys that get
>  mapped back to S-lang internal functions.
> 
>  My SLAG project works pretty much like Python (as does the S-Lang).
>  You write a S-lang script
>  that "imports" your extension. module - and all this gets run by the
>  shell/interpreter.
> 
>  I allow function keys to be mapped back internal function(s) inside of
>  the controlling program.
> 
>  My question is which Python C api Do I need to this with ? 

Do you mean like this?

  http://code.google.com/p/python-slang 

Not sure how well maintained it is though.

> Do I need to worry about my reference counting since the Python
> Program is in essence calling a function in itself?

I'm not sure I understand you here, but in general you don't need to
worry about reference counting in Python - it all happens behind the
scenes.  If you are writing a python extension in C then you do need
to worry about reference counting - a lot!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From tdelaney at avaya.com  Mon Feb 23 15:34:57 2009
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Tue, 24 Feb 2009 04:34:57 +0800
Subject: Peculiar swap behavior
In-Reply-To: <49A2EE60.1060300@tim.thechases.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>

Tim Chase wrote:

> # swap list contents...not so much...
>  >>> m,n = [1,2,3],[4,5,6]
>  >>> m[:],n[:] = n,m
>  >>> m,n
> ([4, 5, 6], [4, 5, 6])
> 
> 
> The first two work as expected but the 3rd seems to leak some
> internal abstraction.  It seems to work if I force content-copying:
> 
>  >>> m[:],n[:] = n[:],m[:]
> 
> or even just
> 
>  >>> m[:],n[:] = n,m[:]
> 
> but not
> 
>  >>> m[:],n[:] = n[:],m
> 
> Is this a bug, something Python should smack the programmer for
> trying, or just me pushing the wrong edges? :)

For these types of things, it's best to expand the code out. The
appropriate expansion of:

    m,n = [1,2,3],[4,5,6]
    m[:],n[:] = n,m

is:

    m = [1,2,3]
    n = [4,5,6]
    m[:] = n
    n[:] = m

After the third line, m == n, giving the behaviour you see. OTOH, for:

    m,n = [1,2,3],[4,5,6]
    m[:],n[:] = n[:],m[:]

the expansion is more like:

    m = [1,2,3]
    n = [4,5,6]
    rhs1 = n[:]
    rhs2 = m[:]
    m[:] = rhs1
    n[:] = rhs2

Tim Delaney


From s.selvamsiva at gmail.com  Mon Feb 23 15:38:56 2009
From: s.selvamsiva at gmail.com (S.Selvam Siva)
Date: Tue, 24 Feb 2009 02:08:56 +0530
Subject: Need to store dictionary in file
Message-ID: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>

Hi all,

I have a dictionary in which each key is associated with a list as value.

eg: *dic={'a':['aa','ant','all']}*

The dictionary contains *1.5 lakh keys*.
Now i want to store it to a file,and need to be loaded to python program
during execution.
I expect your ideas/suggestions.

Note:I think cPickle,bsddb can be used for this purpose,but i want to know
the best solution which runs *faster*.

-- 
Yours,
S.Selvam
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From denis.kasak at gmail.com  Mon Feb 23 15:39:53 2009
From: denis.kasak at gmail.com (Denis Kasak)
Date: Mon, 23 Feb 2009 21:39:53 +0100
Subject: Reference or Value?
In-Reply-To: <gnuvun$hlf$1@ger.gmane.org>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<gnuu5m$beu$1@ger.gmane.org>
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>
	<gnuvun$hlf$1@ger.gmane.org>
Message-ID: <39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:12 PM, Steve Holden <steve at holdenweb.com> wrote:
> Denis Kasak wrote:
>> I assure you I am not confused about Python's object model / calling
>> system. I was arguing, from a purely theoretical standpoint, that the
>> same system Python uses could be described in terms of
>> call-by-reference with some additional constraints. I am by no means
>> arguing that this is a good way of explaining it or trying to explain
>> it to someone in terms of call-by-reference. I just don't think it's
>> "plain simple wrong", just confusing and suboptimal.
>>
> Well, what's the benefit of discussing such a description, then?
> Regulars on c.l.py see this subject arising so regularly it's a bit like
> "there's nothing new under the sun". Honestly, it's been discussed /ad
> nauseam/ lately.

Someone said upthread that Andrew Cooke was completely wrong and I
contested that. :-)
I apologise for not being current with the latest discussions.

-- 
Denis Kasak


From philip at semanchuk.com  Mon Feb 23 15:41:08 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 15:41:08 -0500
Subject: Python C-API Object Allocation
In-Reply-To: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
References: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
Message-ID: <DB5CBF90-F160-480B-BF6E-03ACD6E64958@semanchuk.com>


On Feb 21, 2009, at 10:01 AM, William Newbery wrote:

> Ive been learning the C-API lately so I can write python extensions  
> for some of my c++ stuff.
>
> I want to use the new and delete operators for creating and  
> destroying my objects.
>
> The problem is python seems to break it into several stages. tp_new,  
> tp_init and tp_alloc for creation and tp_del, tp_free and tp_dealloc  
> for destruction. However c++ just has new which allocates and fully  
> constructs the object and delete which destructs and deallocates the  
> object.
>
> Which of the python tp_* methods do I need to provide and what must  
> they do to be compatible with python subclassing.
>
> Also I want to be able to create the object directly in c++ eg  
> "PyObject *obj = new MyExtensionObject(args);"

Hi William,
You can't use C++ new and delete to create Python objects. Not if you  
intend to use them in Python, anyway. Python has its own memory  
management, reference counting, etc. and C++ knows nothing about that.  
You could probably cook up an ugly hack that might work, but you'd be  
swimming against the tide.

If you want to create Python objects, you need ask Python to do it.  
The function PyObject_New() is probably what you want:
http://docs.python.org/c-api/allocation.html


FYI, there are lists specifically for the Python C API and C++ issues.  
I don't mean to chase you away from here; plenty of people ask C API  
questions here. But the other groups are helpful to know about and,  
having just learned about them myself I'm trying to spread the word.  
The lists are here:
http://mail.python.org/mailman/listinfo


Cheers
Philip


From adleslie at gmail.com  Mon Feb 23 15:44:51 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 12:44:51 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
Message-ID: <c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>

On Feb 23, 11:31?am, Bruno Desthuilliers
<bdesth.quelquech... at free.quelquepart.fr> wrote:
> May a ?crit :
>
> > I have three tables:
>
> Actually - from Python's code POV - three Model classes. And actually,
> since there's a very active, friendly and helpful django group on
> googlegroups, you'd be better reposting your question there.
>
> (snip Django's ORM related question)

The django users groups suggests using a manytomany field.  That works
well in the html template, but in the admin tables, the logic for the
manytomany field applies to the wrong model and doesn't create a
choice for the data entry people.  I'm trying to write this without
using the manytomany option.  Just using the standard relational
database model.  I need to understand if python can do what I need to
do.  So far, I've not been successful with an answer in users groups.

Ana


From bdesth.quelquechose at free.quelquepart.fr  Mon Feb 23 15:48:32 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 23 Feb 2009 21:48:32 +0100
Subject: python sql query in django
In-Reply-To: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
Message-ID: <49a31936$0$24803$426a74cc@news.free.fr>

May a ?crit :
(snip)
> I may not stay with Django.

Nope, but your question was about Django.

> I am seriously looking for whether python
> can read data from a relational database

Of course - as long as there's a Python adapter for your DB.

> and send to an html template

Of course - as long as it's either a Python templating system or there's 
a Python binding for this system.

> or do I always need some kind of wrapper/interface such as Rails

Uh ? Rails is a Ruby framework.

> or
> Django?  

No, you don't. If you prefer to reinvent the wheel on each and any part 
of each an any web app you write, please feel free to do so.

> If this is the wrong group to ask that question

Which "that" question ?-)

For question related to Django's ORM, the django group is indeed a 
better place (as usual: always use the most specific group / maling list 
/ whatever first). If you have questions (like the above) that are about 
Python itself, you're at the right place.


From tav at espians.com  Mon Feb 23 15:50:57 2009
From: tav at espians.com (tav)
Date: Mon, 23 Feb 2009 20:50:57 +0000
Subject: Challenge: Please break this! [Python Security]
Message-ID: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>

Hey all,

As an attempt to convince Python-Dev of the merits of a
functions-based approach to security in Python, I've come up with a
simple challenge.

If enough smart hackers look at this and it holds up, Guido promises
to accept a patch which would enable this on both App Engine and
future Python versions.

So, please try the challenge and let me know how you find it. Thanks!

The challenge is simple:

* Open a fresh Python interpreter and do:

    >>> from safelite import FileReader

* You can use FileReader to read files on your filesystem
* Now find a way to *write* to the filesystem from your interpreter

[safelite.py is attached to this mail]

Please note that the aim of this isn't to protect Python against
crashes/segfaults or exhaustion of resources attacks, so those don't
count.

I'm keen to know your experiences even if you don't manage to write to
the filesystem -- and especially if you do!

Dinner and drinks on me for an evening -- when you are next in London
or I am in your town -- to the first person who manages to break
safelite.py and write to the filesystem.

Good luck and thanks! =)

-- 
love, tav

plex:espians/tav | tav at espians.com | +44 (0) 7809 569 369
http://tav.espians.com | http://twitter.com/tav | skype:tavespian
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From steve at holdenweb.com  Mon Feb 23 15:53:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:53:21 -0500
Subject: Reference or Value?
In-Reply-To: <39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>
References: <gnrq68$g9h$1@news.LF.net>	
	<mailman.464.1235320654.11746.python-list@python.org>	
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>	
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>	
	<gnuu5m$beu$1@ger.gmane.org>	
	<39e19a010902231158r27605a7bq72adbd99f29e6032@mail.gmail.com>	
	<gnuvun$hlf$1@ger.gmane.org>
	<39e19a010902231239j16903627u19d330821baa0608@mail.gmail.com>
Message-ID: <49A30CC1.4040207@holdenweb.com>

Denis Kasak wrote:
> On Mon, Feb 23, 2009 at 9:12 PM, Steve Holden <steve at holdenweb.com> wrote:
>> Denis Kasak wrote:
>>> I assure you I am not confused about Python's object model / calling
>>> system. I was arguing, from a purely theoretical standpoint, that the
>>> same system Python uses could be described in terms of
>>> call-by-reference with some additional constraints. I am by no means
>>> arguing that this is a good way of explaining it or trying to explain
>>> it to someone in terms of call-by-reference. I just don't think it's
>>> "plain simple wrong", just confusing and suboptimal.
>>>
>> Well, what's the benefit of discussing such a description, then?
>> Regulars on c.l.py see this subject arising so regularly it's a bit like
>> "there's nothing new under the sun". Honestly, it's been discussed /ad
>> nauseam/ lately.
> 
> Someone said upthread that Andrew Cooke was completely wrong and I
> contested that. :-)
> I apologise for not being current with the latest discussions.
> 
That's OK. If you haven't seen this stuff before it's new to you, I guess.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From darcy at druid.net  Mon Feb 23 15:55:57 2009
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 23 Feb 2009 15:55:57 -0500
Subject: Top posting
In-Reply-To: <49A2F926.5010207@gmail.com>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<49A2ECDD.8040600@gmail.com>
	<20090223135447.184e31bb.darcy@druid.net>
	<49A2F926.5010207@gmail.com>
Message-ID: <20090223155557.c810d017.darcy@druid.net>

On Mon, 23 Feb 2009 20:29:42 +0100
Stef Mientki <stef.mientki at gmail.com> wrote:
> I agree that top posting on a message like this is not very convenient,

Not convenient for thousands, slightly convenient for you.

> but for simple messages ...

It is still better to follow the suggestions I posted.  Also see
http://en.wikipedia.org/wiki/Posting_style.

> >> I don't have to scroll (assuming that I know from previous readings the 
> >> content of the previous message).
> >
> > But how do you know what part of the message is being replied to?
> >   
> simple messages, 1 issue ?

So, "simple" messages one rule and others a different rule?  Who
decides what is simple and what isn't.  If two people put the line in
different places that would really mess up the flow of an exchange
between them.

> When I write a report, almost nobody is interested in all 
> investigations, arguments,
> most are only interested in the conclusion and is therefor always on top.

You are talking about an abstract in a paper.  That is not the same as
a dialogue.  It's not even close.

> btw, it's also polite (in some cultures) to sign your messages ;-)

Hmm.  I appreciate that you took the time to remove my signature from
your reply but I don't think that you should then claim that I never
included one.

-- 
D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.


From steve at holdenweb.com  Mon Feb 23 15:57:44 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 15:57:44 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <200902232126.54519.wolfgang@rohdewald.de>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>	<gnuvfg$ejq$1@ger.gmane.org>
	<200902232126.54519.wolfgang@rohdewald.de>
Message-ID: <gnv2ka$r5v$1@ger.gmane.org>

Wolfgang Rohdewald wrote:
> On Montag, 23. Februar 2009, Steve Holden wrote:
>> yatsek at gmail.com wrote:
>>> Hi there.
>> [...]
>>
>> Yatsek:
>>
>> You just "hijacked a thread" by writing your question as a reply to
>> somebody else's post
> 
> did he? His mail headers show no reference to any other mail AFAICS
> 
No, apparently my newsreader just decided to mingle several threads for
no apparent reason. Bizarrely the thread now appears on its own even
though I haven't restarted Thunderbird.

Yatsek, please accept my apologies.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 16:00:20 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 16:00:20 -0500
Subject: python sql query in django
In-Reply-To: <c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
Message-ID: <gnv2p7$r5v$2@ger.gmane.org>

May wrote:
> On Feb 23, 11:31 am, Bruno Desthuilliers
> <bdesth.quelquech... at free.quelquepart.fr> wrote:
>> May a ?crit :
>>
>>> I have three tables:
>> Actually - from Python's code POV - three Model classes. And actually,
>> since there's a very active, friendly and helpful django group on
>> googlegroups, you'd be better reposting your question there.
>>
>> (snip Django's ORM related question)
> 
> The django users groups suggests using a manytomany field.  That works
> well in the html template, but in the admin tables, the logic for the
> manytomany field applies to the wrong model and doesn't create a
> choice for the data entry people.  I'm trying to write this without
> using the manytomany option.  Just using the standard relational
> database model.  I need to understand if python can do what I need to
> do.  So far, I've not been successful with an answer in users groups.
> 
I am sure if you explain in detail exactly what you want the admin to
present to your data entry people there are those on django-users who
can help you make it happen. That list *would* be the best place to get
an answer: this one mostly discusses the Python language in a more
generic manner.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From torriem at gmail.com  Mon Feb 23 16:14:43 2009
From: torriem at gmail.com (Michael Torrie)
Date: Mon, 23 Feb 2009 14:14:43 -0700
Subject: Python AppStore / Marketplace
In-Reply-To: <gnrn0o$4ju$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org>
Message-ID: <49A311C3.80707@gmail.com>

Steve Holden wrote:
> Unfortunately I have no idea what a "souq" is, so I suspect this may be
> linguistically biased against English speakers. Or perhaps I'm just
> ignorant.

Nah.  Not biased against English speakers.  Just biased against the
un-traveled.  :)


From yatsek at gmail.com  Mon Feb 23 16:17:31 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 13:17:31 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
Message-ID: <00e56c9a-85a7-440c-a48d-2a0ea9e00992@j35g2000yqh.googlegroups.com>

Hi there.
Since quite long time I'm trying to achieve following things:
- for some sort of testing I need webserver with https access
- with POST method implemented

I found something which fits it in nicely written in Python,
connected
my toys and... server hangs in some weird "inter-state" while serving
POST method

Below server code:

-------------------------

#!/usr/bin/python

from SocketServer import *
from BaseHTTPServer import *
from SimpleHTTPServer import *
from tlslite.api import *
import string,cgi,time
from os import curdir, sep

s = open("./server.pem").read()
x509 = X509()
x509.parse(s)
certChain = X509CertChain([x509])

s = open("./server.pem").read()
privateKey = parsePEMKey(s, private=True)

sessionCache = SessionCache()

#class MyHandler(BaseHTTPRequestHandler):
class MyHandler(SimpleHTTPRequestHandler):

    def do_POST(self):
        global rootnode
        try:
            ctype, pdict = cgi.parse_header(self.headers.getheader
('content-type'))
            form = cgi.FieldStorage(fp = self.rfile,
headers=self.headers,
                                    environ={'REQUEST_METHOD':'POST',
                                    'CONTENT_TYPE':self.headers
['content-type']} )

            if ctype == 'multipart/form-data':

                if form.has_key('postdata'):

                    temp_file = open(form['postdata'].filename,'wb')
                    buffer = form['postdata'].file.read()
                    temp_file.write(buffer)
                    temp_file.close()

                    self.send_response(200)
                    #set apriopriate header if you want send
something
                    #self.send_header('Content-type',   'text/plain')
                    self.send_header('Content-type',    'text/html')
                    self.end_headers()

                    #... and send it
                    #self.wfile.write('OK')
                    self.wfile.write('<html><body>Post OK.</body></
html>')
        except :
            pass

class MyHTTPServer(ThreadingMixIn, TLSSocketServerMixIn, HTTPServer):
    def handshake(self, tlsConnection):
        try:
            tlsConnection.handshakeServer(certChain=certChain,
                                          privateKey=privateKey,
                                          sessionCache=sessionCache)
            tlsConnection.ignoreAbruptClose = True
            return True
        except TLSError, error:
            print "Handshake failure:", str(error)
            return False

httpd = MyHTTPServer(('127.0.0.1', 443), MyHandler)
#httpd = HTTPServer(('127.0.0.1', 80), MyHandler)

httpd.serve_forever()

--------------------

And page which is used to serve POST request:

<html>
    <body>
        <form method='POST' enctype='multipart/form-data'
action='./'>

            File to post: <input type=file name=postdata><br><br>
            <input type=submit value=Send>
        </form>
    </body>
</html>

File is being nicely send to server but as I've mentioned above
server
is halted in some interstate. Only after Ctrl+C terminates it
confirmation of successful transmition is showed in web browser

Choosing to use server without SSL (HTTPServer instead of
MyHTTPServer)  makes everything work without glitch.

I would be happy to hear any suggestions

If somebody knows any alternative to achieve similar thing (https +
POST method on server side) it would be enough to get my tests
working.

Thx in advance

Greetz
Yatsek

---
sorry for repost - I've made mistake and tried correct it just after
posting by deleting it. If it confuses somebody then again - sorry for
that


From stef.mientki at gmail.com  Mon Feb 23 16:20:39 2009
From: stef.mientki at gmail.com (Stef Mientki)
Date: Mon, 23 Feb 2009 22:20:39 +0100
Subject: Top posting
In-Reply-To: <20090223155557.c810d017.darcy@druid.net>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>	<20090223135447.184e31bb.darcy@druid.net>	<49A2F926.5010207@gmail.com>
	<20090223155557.c810d017.darcy@druid.net>
Message-ID: <49A31327.60807@gmail.com>


>> btw, it's also polite (in some cultures) to sign your messages ;-)
>>     
>
> Hmm.  I appreciate that you took the time to remove my signature from
> your reply but I don't think that you should then claim that I never
> included one.
>
>   
Sorry for that.

(now you get an idea how difficult it is for me to use the right posting 
guide lines)

cheers,
Stef




From p at ulmcnett.com  Mon Feb 23 16:20:57 2009
From: p at ulmcnett.com (Paul McNett)
Date: Mon, 23 Feb 2009 13:20:57 -0800
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <49A31339.6080207@ulmcnett.com>

tav wrote:
> I'm keen to know your experiences even if you don't manage to write to
> the filesystem -- and especially if you do!

Does it count when it breaks some standard libs that aren't even trying to write to 
the filesystem?

mac:ss pmcnett$ python sbs_studio.py pkm
Traceback (most recent call last):
   File "sbs_studio.py", line 159, in <module>
     main()
   File "sbs_studio.py", line 15, in main
     parser = OptionParser()
   File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
1191, in __init__
     self.set_usage(usage)
   File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
1266, in set_usage
     self.usage = _("%prog [options]")
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 566, in gettext
     return dgettext(_current_domain, message)
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 530, in dgettext
     codeset=_localecodesets.get(domain))
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 465, in translation
     mofiles = find(domain, localedir, languages, all=1)
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 437, in find
     for nelang in _expand_lang(lang):
   File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
line 131, in _expand_lang
     from locale import normalize
ImportError: cannot import name normalize

Paul


From yatsek at gmail.com  Mon Feb 23 16:23:32 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Mon, 23 Feb 2009 13:23:32 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>
	<gnuvfg$ejq$1@ger.gmane.org> <200902232126.54519.wolfgang@rohdewald.de>
	<mailman.569.1235422680.11746.python-list@python.org>
Message-ID: <9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>

On Feb 23, 9:57?pm, Steve Holden <st... at holdenweb.com> wrote:
> Wolfgang Rohdewald wrote:
> > On Montag, 23. Februar 2009, Steve Holden wrote:
> >> yat... at gmail.com wrote:
> >>> Hi there.
> >> [...]
>
> >> Yatsek:
>
> >> You just "hijacked a thread" by writing your question as a reply to
> >> somebody else's post
>
> > did he? His mail headers show no reference to any other mail AFAICS
>
> No, apparently my newsreader just decided to mingle several threads for
> no apparent reason. Bizarrely the thread now appears on its own even
> though I haven't restarted Thunderbird.
>
> Yatsek, please accept my apologies.
>
> regards
> ?Steve

Thx, my bad.
I was trying to correct spelling mistake by deleting older post just
after it was posted and re-posting. Sorry about that.

By the way - don't you think that Google could ad this feature (re-
editing post for some time after posting) and re-invent newsgroups
making it a lot of better tool for communication?

BR
Yatsek



From adleslie at gmail.com  Mon Feb 23 16:27:26 2009
From: adleslie at gmail.com (May)
Date: Mon, 23 Feb 2009 13:27:26 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
Message-ID: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>

On Feb 23, 1:00?pm, Steve Holden <st... at holdenweb.com> wrote:
> May wrote:
> > On Feb 23, 11:31 am, Bruno Desthuilliers
> > <bdesth.quelquech... at free.quelquepart.fr> wrote:
> >> May a ?crit :
>
> >>> I have three tables:
> >> Actually - from Python's code POV - three Model classes. And actually,
> >> since there's a very active, friendly and helpful django group on
> >> googlegroups, you'd be better reposting your question there.
>
> >> (snip Django's ORM related question)
>
> > The django users groups suggests using a manytomany field. ?That works
> > well in the html template, but in the admin tables, the logic for the
> > manytomany field applies to the wrong model and doesn't create a
> > choice for the data entry people. ?I'm trying to write this without
> > using the manytomany option. ?Just using the standard relational
> > database model. ?I need to understand if python can do what I need to
> > do. ?So far, I've not been successful with an answer in users groups.
>
> I am sure if you explain in detail exactly what you want the admin to
> present to your data entry people there are those on django-users who
> can help you make it happen. That list *would* be the best place to get
> an answer: this one mostly discusses the Python language in a more
> generic manner.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

I may not stay with Django.  I am seriously looking for whether python
can read data from a relational database and send to an html template
or do I always need some kind of wrapper/interface such as Rails or
Django?  If this is the wrong group to ask that question could you
recommend another python group that could?

Thanks.


From labmice at gmail.com  Mon Feb 23 16:33:29 2009
From: labmice at gmail.com (Learning Python)
Date: Mon, 23 Feb 2009 13:33:29 -0800 (PST)
Subject: intermediate python csv reader/writer question from a beginner
Message-ID: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>

anything related to csv, I usually use VB within excel to manipulate
the data, nonetheless, i finally got the courage to take a dive into
python.  i have viewed a lot of googled csv tutorials, but none of
them address everything i need.  Nonetheless, I was wondering if
someone can help me manipulate the sample csv (sample.csv) I have
generated:

,,
someinfo,,,,,,,
somotherinfo,,,,,,,
SEQ,Names,Test1,Test2,Date,Time,,
1,Adam,1,2,Monday,1:00 PM,,
2,Bob,3,4,Monday,1:00 PM,,
3,Charlie,5,6,Monday,1:00 PM,,
4,Adam,7,8,Monday,2:00 PM,,
5,Bob,9,10,Monday,2:00 PM,,
6,Charlie,11,12,Monday,2:00 PM,,
7,Adam,13,14,Tuesday,1:00 PM,,
8,Bob,15,16,Tuesday,1:00 PM,,
9,Charlie,17,18,Tuesday,1:00 PM,,

into (newfile.csv):

Adam-Test1,Adam-Test2,Bob-Test1,Bob-Test2,Charlie-Test1,Charlie-
Test2,Date,Time
1,2,3,4,5,6,Monday,1:00 PM
7,8,9,10,11,12,Monday,2:00 PM
13,14,15,16,17,18,Tuesday,1:00 PM

note:
1. the true header doesn't start line 4 (if this is the case would i
have to use "split"?)
2. if there were SEQ#10-12, or 13-15, it would still be Adam, Bob,
Charlie, but with different Test1/Test2/Date/Time


From deets at nospam.web.de  Mon Feb 23 16:34:12 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 23 Feb 2009 22:34:12 +0100
Subject: python sql query in django
In-Reply-To: <f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
Message-ID: <70gj2oF5i4l2U1@mid.uni-berlin.de>

> I may not stay with Django.  I am seriously looking for whether python
> can read data from a relational database and send to an html template
> or do I always need some kind of wrapper/interface such as Rails or
> Django?  If this is the wrong group to ask that question could you
> recommend another python group that could?

Python itself comes neither with an ORM, nor with a HTML 
generating/mapping framework.

So yes, if you want something like that, need something like rails or 
django. Or TurboGears.

For example, you can use SQLAlchemy as ORM, and RUM as frontend for it. 
I'm not sure if it fullfills your requirements though.

http://python-rum.org/

Diez


From tav at espians.com  Mon Feb 23 16:35:46 2009
From: tav at espians.com (tav)
Date: Mon, 23 Feb 2009 21:35:46 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <eb24b25b0902231335w1d0e6d60r5f6f37efc5117e56@mail.gmail.com>

Please use this attached updated safelite.py

Victor Stinner got the dinner by using the reload builtin =)

Good luck!

-- 
love, tav

plex:espians/tav | tav at espians.com | +44 (0) 7809 569 369
http://tav.espians.com | http://twitter.com/tav | skype:tavespian
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From tim.wintle at teamrubber.com  Mon Feb 23 16:35:49 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 21:35:49 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <1235424949.27699.44.camel@tim-laptop>

On Mon, 2009-02-23 at 20:50 +0000, tav wrote:
> I'm keen to know your experiences even if you don't manage to write to
> the filesystem -- and especially if you do!
> 

er sorry, but:

from safelite import FileReader
reload(__builtins__)
f = open("/home/tim/nano.save","w")
f.write("oops")
f.close()

> Dinner and drinks on me for an evening -- when you are next in London
> or I am in your town -- to the first person who manages to break
> safelite.py and write to the filesystem.

I'm in London on Wednesday ;-) Unfortunately I'm going to be too busy to
take up your offer, lol


Tim Wintle






From philip at semanchuk.com  Mon Feb 23 16:45:26 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 23 Feb 2009 16:45:26 -0500
Subject: python sql query in django
In-Reply-To: <70gj2oF5i4l2U1@mid.uni-berlin.de>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<70gj2oF5i4l2U1@mid.uni-berlin.de>
Message-ID: <B12A85AE-6543-4D55-BE1D-C1B834C23076@semanchuk.com>


On Feb 23, 2009, at 4:34 PM, Diez B. Roggisch wrote:

>> I may not stay with Django.  I am seriously looking for whether  
>> python
>> can read data from a relational database and send to an html template
>> or do I always need some kind of wrapper/interface such as Rails or
>> Django?  If this is the wrong group to ask that question could you
>> recommend another python group that could?
>
> Python itself comes neither with an ORM, nor with a HTML generating/ 
> mapping framework.
>
> So yes, if you want something like that, need something like rails  
> or django. Or TurboGears.
>
> For example, you can use SQLAlchemy as ORM, and RUM as frontend for  
> it. I'm not sure if it fullfills your requirements though.

And if you don't like ORMs, most databases have at least one adapter  
out there that allows one to send straight SQL to the DB engine and  
get results back in some useful form. For instance, there's the  
psycopg2 adapter for talking to Postgres. Python has a built-in  
wrapper for SQLite.




From sedelblut at gmail.com  Mon Feb 23 16:45:31 2009
From: sedelblut at gmail.com (Stephen)
Date: Mon, 23 Feb 2009 13:45:31 -0800 (PST)
Subject: Reading a tab delimited text file.
Message-ID: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>

Hi,

I would like to read a text file of numbers produced by a data
acquisition system into three vectors of doubles. The contents of the
file are:

+0.0000000e+0	+2.7645134e+1	+2.7745625e+1

+0.4100041e-1	+2.7637787e+1	+2.7731047e+1

+0.0820008e+0	+2.7645134e+1	+2.7750483e+1
...

or

+0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
...

I would like to read the first column into time_vec, second into
ch1_vec and so on.

(I have never programmed in python and am having trouble finding a way
to do this).

Thanks


From skippy.hammond at gmail.com  Mon Feb 23 16:49:22 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Tue, 24 Feb 2009 08:49:22 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <01b28edb$0$20619$c3e8da3@news.astraweb.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
Message-ID: <49A319E2.1000306@gmail.com>

On 23/02/2009 11:41 PM, Chris Cormie wrote:
>
>> If that not-very-technical description [all I've ever needed] doesn't
>> help, you'll need to read the DW help file (HTFF1K) or wait till
>> someone who knows what they are doing comes along :-)
>
> LOL, I am that person :p

LOL sounds right!

> How do you get *Python* to tell you the dll and the problem symbol? Not
> external tools, Python. Python at a low level is calling LoadLibrary and
> GetProcAddress to resolve symbols and the call fails.

It is the LoadLibrary that is failing; it should be obvious that if it 
was a simple GetProcAddress that was failing, Python would simply throw 
an exception rather than displaying the ugly dialog box you see.

The problem is that some *other* DLL in the chain of dependencies is 
failing to load; please re-adjust your perceptions of your own knowledge 
and re-read John's initial response - if you follow his instructions 
that should all become quite obvious.

Mark


From aquil.abdullah at gmail.com  Mon Feb 23 16:54:06 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 13:54:06 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
Message-ID: <7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>

Hello All,
  So below is my naive attempt at the wrapper, it is only half baked
since I am no master at Interprocess communication... I know that it
is lacking a lot of things comment greatly appreciated:

#!/usr/bin/env python

import os, sys, re, exceptions
try:
    import subprocess
except ImportError:
    import popen2
    subprocess = None

PIPE = 10
SOUT = 11

class Runner:
    def __init__(self):
        self.stdout = None
        self.stdin = None
        self.stderr = None
        self.pid = None
        self.process = None

    def runCmdLine(self, args, executable=None, stdin=None,
stdout=None, stderr=None, preexec_fn=None,
                   close_fds=False, shell=False,cwd=None, env=None):
        """
        args -- a string, or a sequence of program arguments. The
argument to execute is
        normally the first item in the args sequence or the string if
a string is given,
        but can be explicitly set by using the executable argument.

        executable -- string to be executed

        stdin, stdout, stderr -- value of standard input, standard
output, and standard
        error file handles.  None implies no redirection. Valid values
are PIPE, an existing
        file descriptor (a positive integer), an existing file object,
and None.

        shell -- specifies whether command should be executed through
shell

        cwd -- specifies whether, childs current directory will be
changed to cwd

        env -- A map that specifies the environment variables in child
process
        that will be overwritten

        NOTE: Depending on the modules available, some arguments may
not be used.
        """
        if subprocess:
            # Use subprocess to exec functions
            if stdin == PIPE:
                sin = subprocess.PIPE
            else:
                # NOTE: User may input invalid values that will cause
exceptions
                sin = stdin
            if stdout == PIPE:
                sout = subprocess.PIPE
            else:
                sout = stdout
            if stderr == SOUT:
                serr = subprocess.STDOUT
            else:
                serr = stderr

            self.process = subprocess.Popen(args, stdin=sin,
stdout=sout, stderr=serr,
 
preexec_fn=preexec_fn,close_fds=close_fds, shell=shell,
                                            env=env, cwd=cwd)
            self.pid = self.process.pid
           # Add attributes stdin, stdout, and stderr
            self.stdin = self.process.stdin
            self.stdout = self.process.stdout
            self.stderr = self.process.stderr
        else:
            # Use popen2 to exec functions
            # Determine which form of popen2 to use
            if stderr == SOUT or stderr == None:
                self.process =  popen2.Popen4(args)
                self.stdin = self.process.tochild
                self.stdout = self.process.fromchild
                self.stderr = None
            else:
                self.process =  popen2.Popen3(args)
                self.stdin = self.process.tochild
                self.stdout = self.process.fromchild
                self.stderr = self.process.childerr

            self.pid = self.process.pid

    def wait(self,):
        """
        Waits for and returns the status code of the child process.
        """
        return self.process.wait()

    def poll(self,):
        """
        Returns -1 if the child process hasn't completed yet, or it's
return code
        otherwise
        """
        return self.process.poll()

Aquil

On Feb 23, 2:10?pm, Christian Heimes <li... at cheimes.de> wrote:
> aha wrote
>
> > def runner(cmd, stdin, stdout, ...):
> > ? try:
> > ? ? import subprocess
> > ? ? sbm = 1
> > ? except:
> > ? ? sbm = 0
>
> > ? # Now do something
> > ? if sbm:
> > ? ? process = subporcess(...)
> > ? else:
> > ? ? import popen2
> > ? ? process = popen2.Popen4(...)
>
> > Has anyone else run into a situation similar to this one?
>
> The canonical way for your try/except clause is:
>
> try:
> ? ? import subprocess
> except ImportError:
> ? ? subprocess = None
>
> ...
>
> if subprocess is not None:
> ? ? ...
> else:
> ? ? ...
>
> Christian



From bob at mellowood.ca  Mon Feb 23 17:05:42 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 15:05:42 -0700
Subject: more on unescaping escapes
Message-ID: <gnv6jn$4nh$1@news.motzarella.org>


So, we think something is working and send of a bug fix to our client :)

I'm not sure I understand this at all and wonder if there is bug?

 >>> a="c:\\Program\x20Files\\test"
 >>> a
'c:\\Program Files\\test'

so far, so good.

 >>> a.decode("string-escape")
'c:\\Program Files\test'

Umm, not so good? The \\ before the P is okay, but the \\t is change to \t

and

 >>> print a.decode("string-escape")
c:\Program Files        est

Now, decode() converted the \\t to a \t and print expanded the \t to a tab.

I would have thought that the \\t would have the same result as the \\P ???

Obviously my brain is missing something (hopefully obvious).



From python.list at tim.thechases.com  Mon Feb 23 17:06:58 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 16:06:58 -0600
Subject: Reading a tab delimited text file.
In-Reply-To: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
Message-ID: <49A31E02.3020108@tim.thechases.com>

> I would like to read a text file of numbers produced by a data
> acquisition system into three vectors of doubles. The contents of the
> file are:
> 
> +0.0000000e+0	+2.7645134e+1	+2.7745625e+1
> +0.4100041e-1	+2.7637787e+1	+2.7731047e+1
> +0.0820008e+0	+2.7645134e+1	+2.7750483e+1
> ...
> 
> or
> 
> +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> ...
> 
> I would like to read the first column into time_vec, second into
> ch1_vec and so on.
> 
> (I have never programmed in python and am having trouble finding a way
> to do this).

Well, a very terse way of doing it would be something like:

   time_vec, ch1_vec, and_so_on = zip(*(
     map(float, line.split())
     for line in file('in.txt')))

If my junior developer authored that, I'm not sure whether I'd 
laud her or fire her. :)

If this isn't homework, there are some less terse versions which 
are a bit easier on the eyes and less like some love-child 
between Perl and Python.

-tkc





From steve at holdenweb.com  Mon Feb 23 17:12:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:12:09 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <49A311C3.80707@gmail.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>	<gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com>
Message-ID: <gnv6vs$bm7$1@ger.gmane.org>

Michael Torrie wrote:
> Steve Holden wrote:
>> Unfortunately I have no idea what a "souq" is, so I suspect this may be
>> linguistically biased against English speakers. Or perhaps I'm just
>> ignorant.
> 
> Nah.  Not biased against English speakers.  Just biased against the
> un-traveled.  :)

Don't think so. I've visited roughly twenty-five difference countries
and traveled I-don't-know-how-many miles, but certainly over a million.
Unless you'd like to redefine "un-traveled" ... ?

But I do (still) speak English (of a kind).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 17:12:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:12:56 -0500
Subject: Top posting
In-Reply-To: <49A31327.60807@gmail.com>
References: <49A1567B.5020407@gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>	<49A272F1.7090004@gmail.com>	<gnunrq$eov$1@ger.gmane.org>	<49A2ECDD.8040600@gmail.com>	<20090223135447.184e31bb.darcy@druid.net>	<49A2F926.5010207@gmail.com>	<20090223155557.c810d017.darcy@druid.net>
	<49A31327.60807@gmail.com>
Message-ID: <gnv71a$bm7$2@ger.gmane.org>

Stef Mientki wrote:
> 
>>> btw, it's also polite (in some cultures) to sign your messages ;-)
>>>     
>>
>> Hmm.  I appreciate that you took the time to remove my signature from
>> your reply but I don't think that you should then claim that I never
>> included one.
>>
>>   
> Sorry for that.
> 
> (now you get an idea how difficult it is for me to use the right posting
> guide lines)
> 
It gets easier the more you do it. Practice make perfect, y'know ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Mon Feb 23 17:14:15 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 17:14:15 -0500
Subject: Python, HTTPS (SSL), tlslite and metoda POST (and lots of pain)
In-Reply-To: <9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>
References: <7f2676dd-a87c-4d0f-9f21-bcf2ce6d47fa@n10g2000vbl.googlegroups.com>	<gnuvfg$ejq$1@ger.gmane.org>
	<200902232126.54519.wolfgang@rohdewald.de>	<mailman.569.1235422680.11746.python-list@python.org>
	<9329924e-fd29-4637-aaa7-e70a81092b52@l1g2000yqj.googlegroups.com>
Message-ID: <gnv73q$bm7$3@ger.gmane.org>

yatsek at gmail.com wrote:
> On Feb 23, 9:57 pm, Steve Holden <st... at holdenweb.com> wrote:
>> Wolfgang Rohdewald wrote:
>>> On Montag, 23. Februar 2009, Steve Holden wrote:
>>>> yat... at gmail.com wrote:
>>>>> Hi there.
>>>> [...]
>>>> Yatsek:
>>>> You just "hijacked a thread" by writing your question as a reply to
>>>> somebody else's post
>>> did he? His mail headers show no reference to any other mail AFAICS
>> No, apparently my newsreader just decided to mingle several threads for
>> no apparent reason. Bizarrely the thread now appears on its own even
>> though I haven't restarted Thunderbird.
>>
>> Yatsek, please accept my apologies.
>>
>> regards
>>  Steve
> 
> Thx, my bad.
> I was trying to correct spelling mistake by deleting older post just
> after it was posted and re-posting. Sorry about that.
> 
> By the way - don't you think that Google could ad this feature (re-
> editing post for some time after posting) and re-invent newsgroups
> making it a lot of better tool for communication?
> 
They probably could, but so far they don't even seem inclined to do much
about rampant spamming.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From andrew at acooke.org  Mon Feb 23 17:17:42 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 19:17:42 -0300 (CLST)
Subject: Peculiar swap behavior
In-Reply-To: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com
	>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
Message-ID: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>

Delaney, Timothy (Tim) wrote:
> Tim Chase wrote:
>> # swap list contents...not so much...
>>  >>> m,n = [1,2,3],[4,5,6]
>>  >>> m[:],n[:] = n,m
>>  >>> m,n
>> ([4, 5, 6], [4, 5, 6])
[...]
> For these types of things, it's best to expand the code out. The
> appropriate expansion of:
>     m,n = [1,2,3],[4,5,6]
>     m[:],n[:] = n,m
> is:
>     m = [1,2,3]
>     n = [4,5,6]
>     m[:] = n
>     n[:] = m
> [...] OTOH, for:
>     m,n = [1,2,3],[4,5,6]
>     m[:],n[:] = n[:],m[:]
> the expansion is more like:
>     m = [1,2,3]
>     n = [4,5,6]
>     rhs1 = n[:]
>     rhs2 = m[:]
>     m[:] = rhs1
>     n[:] = rhs2

Maybe I'm just being stupid, but you don't seem to have explained
anything.  Isn't the question: Why is the expansion different for the two
cases?  Why don't both expand to have the intermediate rhs variables?

Andrew




From sedelblut at gmail.com  Mon Feb 23 17:17:44 2009
From: sedelblut at gmail.com (Stephen)
Date: Mon, 23 Feb 2009 14:17:44 -0800 (PST)
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
	<mailman.578.1235426821.11746.python-list@python.org>
Message-ID: <60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>

On Feb 23, 4:06?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> > I would like to read a text file of numbers produced by a data
> > acquisition system into three vectors of doubles. The contents of the
> > file are:
>
> > +0.0000000e+0 ? ? ?+2.7645134e+1 ? +2.7745625e+1
> > +0.4100041e-1 ? ? ?+2.7637787e+1 ? +2.7731047e+1
> > +0.0820008e+0 ? ? ?+2.7645134e+1 ? +2.7750483e+1
> > ...
>
> > or
>
> > +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> > ...
>
> > I would like to read the first column into time_vec, second into
> > ch1_vec and so on.
>
> > (I have never programmed in python and am having trouble finding a way
> > to do this).
>
> Well, a very terse way of doing it would be something like:
>
> ? ?time_vec, ch1_vec, and_so_on = zip(*(
> ? ? ?map(float, line.split())
> ? ? ?for line in file('in.txt')))
>
> If my junior developer authored that, I'm not sure whether I'd
> laud her or fire her. :)
>
> If this isn't homework, there are some less terse versions which
> are a bit easier on the eyes and less like some love-child
> between Perl and Python.
>
> -tkc

haha, no this isn't homework. I'm a mechanical engineering student
working on a research project and this program is for my personal use
to analyze the data.


From aquil.abdullah at gmail.com  Mon Feb 23 17:20:04 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 14:20:04 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
Message-ID: <fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>

I've decided to change the runCmdLine method to Popen.
On Feb 23, 4:54?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? So below is my naive attempt at the wrapper, it is only half baked
> since I am no master at Interprocess communication... I know that it
> is lacking a lot of things comment greatly appreciated:
>
> #!/usr/bin/env python
>
> import os, sys, re, exceptions
> try:
> ? ? import subprocess
> except ImportError:
> ? ? import popen2
> ? ? subprocess = None
>
> PIPE = 10
> SOUT = 11
>
> class Runner:
> ? ? def __init__(self):
> ? ? ? ? self.stdout = None
> ? ? ? ? self.stdin = None
> ? ? ? ? self.stderr = None
> ? ? ? ? self.pid = None
> ? ? ? ? self.process = None
>
> ? ? def runCmdLine(self, args, executable=None, stdin=None,
> stdout=None, stderr=None, preexec_fn=None,
> ? ? ? ? ? ? ? ? ? ?close_fds=False, shell=False,cwd=None, env=None):
> ? ? ? ? """
> ? ? ? ? args -- a string, or a sequence of program arguments. The
> argument to execute is
> ? ? ? ? normally the first item in the args sequence or the string if
> a string is given,
> ? ? ? ? but can be explicitly set by using the executable argument.
>
> ? ? ? ? executable -- string to be executed
>
> ? ? ? ? stdin, stdout, stderr -- value of standard input, standard
> output, and standard
> ? ? ? ? error file handles. ?None implies no redirection. Valid values
> are PIPE, an existing
> ? ? ? ? file descriptor (a positive integer), an existing file object,
> and None.
>
> ? ? ? ? shell -- specifies whether command should be executed through
> shell
>
> ? ? ? ? cwd -- specifies whether, childs current directory will be
> changed to cwd
>
> ? ? ? ? env -- A map that specifies the environment variables in child
> process
> ? ? ? ? that will be overwritten
>
> ? ? ? ? NOTE: Depending on the modules available, some arguments may
> not be used.
> ? ? ? ? """
> ? ? ? ? if subprocess:
> ? ? ? ? ? ? # Use subprocess to exec functions
> ? ? ? ? ? ? if stdin == PIPE:
> ? ? ? ? ? ? ? ? sin = subprocess.PIPE
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? # NOTE: User may input invalid values that will cause
> exceptions
> ? ? ? ? ? ? ? ? sin = stdin
> ? ? ? ? ? ? if stdout == PIPE:
> ? ? ? ? ? ? ? ? sout = subprocess.PIPE
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? sout = stdout
> ? ? ? ? ? ? if stderr == SOUT:
> ? ? ? ? ? ? ? ? serr = subprocess.STDOUT
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? serr = stderr
>
> ? ? ? ? ? ? self.process = subprocess.Popen(args, stdin=sin,
> stdout=sout, stderr=serr,
>
> preexec_fn=preexec_fn,close_fds=close_fds, shell=shell,
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? env=env, cwd=cwd)
> ? ? ? ? ? ? self.pid = self.process.pid
> ? ? ? ? ? ?# Add attributes stdin, stdout, and stderr
> ? ? ? ? ? ? self.stdin = self.process.stdin
> ? ? ? ? ? ? self.stdout = self.process.stdout
> ? ? ? ? ? ? self.stderr = self.process.stderr
> ? ? ? ? else:
> ? ? ? ? ? ? # Use popen2 to exec functions
> ? ? ? ? ? ? # Determine which form of popen2 to use
> ? ? ? ? ? ? if stderr == SOUT or stderr == None:
> ? ? ? ? ? ? ? ? self.process = ?popen2.Popen4(args)
> ? ? ? ? ? ? ? ? self.stdin = self.process.tochild
> ? ? ? ? ? ? ? ? self.stdout = self.process.fromchild
> ? ? ? ? ? ? ? ? self.stderr = None
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? self.process = ?popen2.Popen3(args)
> ? ? ? ? ? ? ? ? self.stdin = self.process.tochild
> ? ? ? ? ? ? ? ? self.stdout = self.process.fromchild
> ? ? ? ? ? ? ? ? self.stderr = self.process.childerr
>
> ? ? ? ? ? ? self.pid = self.process.pid
>
> ? ? def wait(self,):
> ? ? ? ? """
> ? ? ? ? Waits for and returns the status code of the child process.
> ? ? ? ? """
> ? ? ? ? return self.process.wait()
>
> ? ? def poll(self,):
> ? ? ? ? """
> ? ? ? ? Returns -1 if the child process hasn't completed yet, or it's
> return code
> ? ? ? ? otherwise
> ? ? ? ? """
> ? ? ? ? return self.process.poll()
>
> Aquil
>
> On Feb 23, 2:10?pm, Christian Heimes <li... at cheimes.de> wrote:
>
> > aha wrote
>
> > > def runner(cmd, stdin, stdout, ...):
> > > ? try:
> > > ? ? import subprocess
> > > ? ? sbm = 1
> > > ? except:
> > > ? ? sbm = 0
>
> > > ? # Now do something
> > > ? if sbm:
> > > ? ? process = subporcess(...)
> > > ? else:
> > > ? ? import popen2
> > > ? ? process = popen2.Popen4(...)
>
> > > Has anyone else run into a situation similar to this one?
>
> > The canonical way for your try/except clause is:
>
> > try:
> > ? ? import subprocess
> > except ImportError:
> > ? ? subprocess = None
>
> > ...
>
> > if subprocess is not None:
> > ? ? ...
> > else:
> > ? ? ...
>
> > Christian
>
>



From mwilson at the-wire.com  Mon Feb 23 17:22:29 2009
From: mwilson at the-wire.com (Mel)
Date: Mon, 23 Feb 2009 17:22:29 -0500
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
Message-ID: <gnv7iq$u0q$1@services.telesweet.net>

Stephen wrote:

> Hi,
> 
> I would like to read a text file of numbers produced by a data
> acquisition system into three vectors of doubles. The contents of the
> file are:
> 
> +0.0000000e+0 +2.7645134e+1   +2.7745625e+1
> 
> +0.4100041e-1 +2.7637787e+1   +2.7731047e+1
> 
> +0.0820008e+0 +2.7645134e+1   +2.7750483e+1
> ...
> 
> or
> 
> +0.0000000e+0\t+2.7645134e+1\t+2.7745625e+1\r\n
> ...
> 
> I would like to read the first column into time_vec, second into
> ch1_vec and so on.
> 
> (I have never programmed in python and am having trouble finding a way
> to do this).

A simple starting point, without error handling, etc., could be:

a_list = []
b_list = []
c_list = []
for line in open ('my_numbers.txt', 'rt'):
    a, b, c = [float (x) for x in line.split()]
    a_list.append (a)
    b_list.append (b)
    c_list.append (c)

Assuming every line has three tab-separated numbers, the text versions of
the numbers are all convertable to float, the text file that's opened will
eventually be closed (whether by garbage collection or program
termination.)

This code does illustrate the string's split method, list comprehension,
sequence unpacking, and the fact that each of a_list, b_list, c_list *MUST*
be initialized with a distinct empty list object.

        Mel.




From google at mrabarnett.plus.com  Mon Feb 23 17:36:41 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 22:36:41 +0000
Subject: more on unescaping escapes
In-Reply-To: <gnv6jn$4nh$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
Message-ID: <49A324F9.4040201@mrabarnett.plus.com>

bvdp wrote:
> 
> So, we think something is working and send of a bug fix to our client :)
> 
> I'm not sure I understand this at all and wonder if there is bug?
> 
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
> 
> so far, so good.
> 
>  >>> a.decode("string-escape")
> 'c:\\Program Files\test'
> 
> Umm, not so good? The \\ before the P is okay, but the \\t is change to \t
> 
Decoding changes "\\x20" to "\x20", which is the same as " ", a space.

Decoding changes "\\t" to "\t", which is a tab.

Decoding _doesn't_ change "\\P" to "\P" because that's not a valid
escape sequence.

> and
> 
>  >>> print a.decode("string-escape")
> c:\Program Files        est
> 
> Now, decode() converted the \\t to a \t and print expanded the \t to a tab.
> 
\t is already a tab.

> I would have thought that the \\t would have the same result as the \\P ???
> 
> Obviously my brain is missing something (hopefully obvious).
> 
Before storing the string (writing it to the file), encode it and then
replace " " with "\\x20":

     C:\Program Files\test

becomes:

     C:\Program Files\test

and then:

     C:\\Program\x20Files\\test

After fetching the string (reading it from the file), decode it:

     C:\\Program\x20Files\\test

becomes:

     C:\Program Files\test



From python.list at tim.thechases.com  Mon Feb 23 17:45:12 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Mon, 23 Feb 2009 16:45:12 -0600
Subject: Reading a tab delimited text file.
In-Reply-To: <60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>	<mailman.578.1235426821.11746.python-list@python.org>
	<60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
Message-ID: <49A326F8.5080202@tim.thechases.com>

>>    time_vec, ch1_vec, and_so_on = zip(*(
>>      map(float, line.split())
>>      for line in file('in.txt')))
>>
>> If this isn't homework, there are some less terse versions which
>> are a bit easier on the eyes and less like some love-child
>> between Perl and Python.
> 
> haha, no this isn't homework. I'm a mechanical engineering student
> working on a research project and this program is for my personal use
> to analyze the data.

The "zip-star map-float" variant is a pretty unreadable way to go.

The more readable versions look something like

   data = [map(float, line.split()) for line in file('in.txt')]
   time_vec = [bit[0] for bit in data]
   ch1_vec = [bit[1] for bit in data]
   and_so_on = [bit[2] for bit in data]

or even

   time_vec = []
   ch1_vec = []
   and_so_on = []
   for line in file('in.txt'):
     a,b,c = map(float, line.split())
     time_vec.append(a)
     ch1_vec.append(b)
     and_so_on.append(c)

which could also be written as

   for line in file('in.txt'):
     line = line.split()
     time_vec.append(float(line[0]))
     ch1_vec.append(float(line[1]))
     and_so_on.append(float(line[2]))

-tkc






From steve at holdenweb.com  Mon Feb 23 18:00:24 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 18:00:24 -0500
Subject: A tale of two execs
In-Reply-To: <fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>	<mailman.544.1235416507.11746.python-list@python.org>	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com>
Message-ID: <gnv9qb$lc4$2@ger.gmane.org>

aha wrote:
> I've decided to change the runCmdLine method to Popen.
> [...]

So just exactly why was it necessary to follow this remark with about
three hundred lines of quoted text? And can't you put your replies at
the bottom rather than the top, please? And trim the stuff that isn't
required. It's simple courtesy to your readers.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From robert.kern at gmail.com  Mon Feb 23 18:00:50 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 23 Feb 2009 17:00:50 -0600
Subject: Peculiar swap behavior
In-Reply-To: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
	<474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
Message-ID: <gnv9r2$lkd$1@ger.gmane.org>

On 2009-02-23 16:17, andrew cooke wrote:
> Delaney, Timothy (Tim) wrote:
>> Tim Chase wrote:
>>> # swap list contents...not so much...
>>>   >>>  m,n = [1,2,3],[4,5,6]
>>>   >>>  m[:],n[:] = n,m
>>>   >>>  m,n
>>> ([4, 5, 6], [4, 5, 6])
> [...]
>> For these types of things, it's best to expand the code out. The
>> appropriate expansion of:
>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n,m
>> is:
>>      m = [1,2,3]
>>      n = [4,5,6]
>>      m[:] = n
>>      n[:] = m
>> [...] OTOH, for:
>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n[:],m[:]
>> the expansion is more like:
>>      m = [1,2,3]
>>      n = [4,5,6]
>>      rhs1 = n[:]
>>      rhs2 = m[:]
>>      m[:] = rhs1
>>      n[:] = rhs2
>
> Maybe I'm just being stupid, but you don't seem to have explained
> anything.  Isn't the question: Why is the expansion different for the two
> cases?  Why don't both expand to have the intermediate rhs variables?

n[:] on the RHS makes a copy of the list.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From nad at acm.org  Mon Feb 23 18:01:00 2009
From: nad at acm.org (Ned Deily)
Date: Mon, 23 Feb 2009 15:01:00 -0800
Subject: Python won't run
References: <37c2b0840902201652m118c1661s6eebe110f1b41fdf@mail.gmail.com>
	<50697b2c0902201703x79b6635dw60e7956d8500731a@mail.gmail.com>
	<37c2b0840902201716y6d072720m18b64d7734e65b18@mail.gmail.com>
	<50697b2c0902201720j2025ee3pad92c2600c912fb8@mail.gmail.com>
	<37c2b0840902201724h51e949fbpb49f99c3521ed32d@mail.gmail.com>
	<50697b2c0902201728k50076bdard53da0f567f2c65e@mail.gmail.com>
	<37c2b0840902201734n708e7d6ds349d7b4ad7af1b2d@mail.gmail.com>
	<50697b2c0902201741x46ebbe07ge4fbac1e3f7fee4b@mail.gmail.com>
	<37c2b0840902201751q5ac4b607n14c90ee0b51c1c00@mail.gmail.com>
	<nad-75A7C1.18281820022009@news.gmane.org>
Message-ID: <nad-99FB0F.15010023022009@news.gmane.org>

[Again, please reply-all to the list, don't send private email!]

On Feb 23, 2009, at 14:03 , kevin hayes wrote:
> Ned, system log didn't do anything when I tried to open IDLE. However, this 
> is what's in the console.log. does this tell you anything?
> 
> Unhandled server exception!
> Thread: SockThread
> Client Address:  ('127.0.0.1', 8833)
> Request:  <socket._socketobject object at 0x1087bc8>
> Traceback (most recent call last):
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 281, in _handle_request_noblock
>     self.process_request(request, client_address)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 307, in process_request
>     self.finish_request(request, client_address)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 320, in finish_request
>     self.RequestHandlerClass(request, client_address, self)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/rpc.p
> y", line 503, in __init__
>     SocketServer.BaseRequestHandler.__init__(self, sock, addr, svr)
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.
> py", line 615, in __init__
>     self.handle()
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/run.p
> y", line 256, in handle
>     import IOBinding
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/idlelib/IOBin
> ding.py", line 12, in <module>
>     import tempfile
>   File 
> "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/tempfile.py",
>  line 34, in <module>
>     from random import Random as _Random
>   File "random.py", line 3, in <module>
>     import rand      # handy random-number functions
> ImportError: No module named rand
> 
> *** Unrecoverable, server exiting!
[...]

It looks like you have a file named random.py in your Documents 
directory.  IDLE.app adds ~/Documents to the front of sys.path, python's 
search path for modules.   Your random.py is being found before the 
standard library module, random, causing the idle server process to 
abort.  Rename your random.py* and all should be well for both 2.5 and 
2.6.

One could argue that IDLE.app should be smarter about situations like 
this.  It would be good to open an issue about this on the python 
tracker:
   http://bugs.python.org/

--
  Ned Deily
  nad at acm.org -- []

-- 
 Ned Deily,
 nad at acm.org



From tim.wintle at teamrubber.com  Mon Feb 23 18:13:14 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 23 Feb 2009 23:13:14 +0000
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <49A31339.6080207@ulmcnett.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
	<49A31339.6080207@ulmcnett.com>
Message-ID: <1235430794.27699.131.camel@tim-laptop>

On Mon, 2009-02-23 at 13:20 -0800, Paul McNett wrote:
> tav wrote:
> > I'm keen to know your experiences even if you don't manage to write to
> > the filesystem -- and especially if you do!
> 
> Does it count when it breaks some standard libs that aren't even trying to write to 
> the filesystem?

It appears to prevent any imports from being allowed at all.

> 
> mac:ss pmcnett$ python sbs_studio.py pkm
> Traceback (most recent call last):
>    File "sbs_studio.py", line 159, in <module>
>      main()
>    File "sbs_studio.py", line 15, in main
>      parser = OptionParser()
>    File 
> "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
> 1191, in __init__
>      self.set_usage(usage)
>    File 
> "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/optparse.py", line 
> 1266, in set_usage
>      self.usage = _("%prog [options]")
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 566, in gettext
>      return dgettext(_current_domain, message)
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 530, in dgettext
>      codeset=_localecodesets.get(domain))
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 465, in translation
>      mofiles = find(domain, localedir, languages, all=1)
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 437, in find
>      for nelang in _expand_lang(lang):
>    File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/gettext.py", 
> line 131, in _expand_lang
>      from locale import normalize
> ImportError: cannot import name normalize
> 
> Paul
> --
> http://mail.python.org/mailman/listinfo/python-list



From vincent at vincentdavis.net  Mon Feb 23 18:18:00 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 16:18:00 -0700
Subject: read csv error question
Message-ID: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>

I am trying to read a csv file from excel on a mac. I get the following
error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
field - do you need to open the file in universal-newline mode?
I was using the example code
import csv, sys

reader = csv.reader(open('/Volumes/vincentdavis
2/match/data/matchdata2008.csv', "rb"))
try:
    for row in reader:
        print row
except csv.Error, e:
    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))

I think this has to do with the end of line character but I am unsure how to
fix it. I don't what to change the actual csv file I would like to fix the
code.

Thanks
Vincent Davis
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From kyrie at uh.cu  Mon Feb 23 18:18:10 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Mon, 23 Feb 2009 18:18:10 -0500
Subject: Challenge: Please break this! [Python Security]
In-Reply-To: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
References: <eb24b25b0902231250x49f7ea44ta5a7856946a4e54b@mail.gmail.com>
Message-ID: <200902231818.10603.kyrie@uh.cu>

On Monday 23 February 2009 03:50:57 pm tav wrote:
> Hey all,
>
> As an attempt to convince Python-Dev of the merits of a
> functions-based approach to security in Python, I've come up with a
> simple challenge.
>

While I'm almost excited that you are tackling the problem of python's 
security, I find that your approach seems to break too many things:

---
 >>> from safelite import FileReader
 >>> import numeric
 >>> print numeric
 None
 >>> import i_hope_this_doesnt_exists
 >>> print i_hope_this_doesnt_exists
 None
---

Versus:
---
 >>> import django
 >>> print django
 <module 'django' from '/usr/lib/python2.5/site-packages/django/__init__.pyc'>
 >>> import i_hope_this_doesnt_exists
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 ImportError: No module named i_hope_this_doesnt_exists
---

ipython also gets broken after the import (nothing works after the import).

Still, it seems interesting... 

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From clp2 at rebertia.com  Mon Feb 23 18:20:45 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 15:20:45 -0800
Subject: Peculiar swap behavior
In-Reply-To: <49A2EE60.1060300@tim.thechases.com>
References: <49A2EE60.1060300@tim.thechases.com>
Message-ID: <50697b2c0902231520jcf7d85dhf5add59889db3868@mail.gmail.com>

On Mon, Feb 23, 2009 at 10:43 AM, Tim Chase
<python.list at tim.thechases.com> wrote:
<snip>
> # swap list contents...not so much...
>>>> m,n = [1,2,3],[4,5,6]
>>>> m[:],n[:] = n,m
>>>> m,n
> ([4, 5, 6], [4, 5, 6])

Pseudo-C-Python expansion:
#evaluate RHS. simply *take pointers* since the RHS is just plain variables
ptr_n = &n
ptr_m = &m
#perform "assignments" to LHS
#remember that x[y] = z is really a method call to __setitem__ in disguise
#let's pseudo-expand the method calls
#also remember that the assignments must be serialized (Python isn't
magically parallel)
m._items  = (*ptr_n)._items #uh-oh! this just clobbered n._items!
since we only kept a pointer to n, n._items is now gone forever!
n._items = (*ptr_m)._items #uh-oh! this now has no real effect since
we clobbered m._items
#badness!

> The first two work as expected but the 3rd seems to leak some internal
> abstraction.  It seems to work if I force content-copying:
>
>>>> m[:],n[:] = n[:],m[:]

Pseudo-C-Python expansion:
#evaluate RHS. it's more complicated this time. this matters significantly!
#remember that x[y] is really a *method call* in disguise to __getitem__
#let's pseudo-expend the method-calls too
#note that we *make copies* instead of just taking pointers this time!
n_cpy = copy_list(n)
m_cpy = copy_list(m)
#same principles as before
m._items  = n_cpy._items #but we have a copy of m._items in m_cpy, so
m._items isn't lost forever!
n._items = m_cpy._items #yay, it works!
#huzzah

<snip>

> Is this a bug, something Python should smack the programmer for trying, or
> just me pushing the wrong edges? :)

Little from column A, little from column B. Using the swapping
assignment works slightly unintuitively with list slices because
copying doesn't magically take place; you need to do this copying
explicitly whereas it's sorta done for you with plain variable
swapping. Just keep in mind that container contents work
"by-reference" rather than "by-value", so to speak.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From woodygar at sky.com  Mon Feb 23 18:33:31 2009
From: woodygar at sky.com (Gary Wood)
Date: Mon, 23 Feb 2009 23:33:31 -0000
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
Message-ID: <E306DE3F7B904BF094575153877180B6@Woodygar>

'''exercise to complete and test this function'''
import string
def joinStrings(items):
    '''Join all the strings in stringList into one string,
    and return the result. For example:
    >>> print joinStrings(['very', 'hot', 'day'])
    'veryhotday'
    '''
    for i in items:
       return (''.join(items))
       
def main():
    print(joinStrings(['very', 'hot','day']))
    print(joinStrings(['this', 'is','it']))
    print(joinStrings(['1', '2', '3', '4', '5']))

main()


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From harijay at gmail.com  Mon Feb 23 18:37:36 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 15:37:36 -0800 (PST)
Subject: Reading a tab delimited text file.
References: <2f324124-1373-458f-8d5f-8664f0128660@n21g2000vba.googlegroups.com>
	<mailman.578.1235426821.11746.python-list@python.org>
	<60e42b67-88b5-4790-af56-5070e697e8eb@t11g2000yqg.googlegroups.com>
	<mailman.584.1235429116.11746.python-list@python.org>
Message-ID: <d97294dd-ba8f-4c29-b8ee-025ac3eaed1d@b16g2000yqb.googlegroups.com>

You could also use the csv module

import csv
myfileobj = open("myfiletab.txt","read")
csv_read = csv.reader(myfileobj,dialect=csv.excel_tab)
myval1 = []
myval2 = []
myval3 = []
for line in csv_read:
# filter header and stuff using some criterion
    if len(line) = 3:
      myval1.append(line[0])
      myval2.append(line[1])
      myval3.append(line[2])


etc etc . The csv module defines a dialect excel_tab. Each line is
then parsed into an array . You can insert that array into another
array and have an array line mydata = [ [line1],[line2] ...]

Hopw this helps
harijay

On Feb 23, 5:45?pm, Tim Chase <python.l... at tim.thechases.com> wrote:
> >> ? ?time_vec, ch1_vec, and_so_on = zip(*(
> >> ? ? ?map(float, line.split())
> >> ? ? ?for line in file('in.txt')))
>
> >> If this isn't homework, there are some less terse versions which
> >> are a bit easier on the eyes and less like some love-child
> >> between Perl and Python.
>
> > haha, no this isn't homework. I'm a mechanical engineering student
> > working on a research project and this program is for my personal use
> > to analyze the data.
>
> The "zip-star map-float" variant is a pretty unreadable way to go.
>
> The more readable versions look something like
>
> ? ?data = [map(float, line.split()) for line in file('in.txt')]
> ? ?time_vec = [bit[0] for bit in data]
> ? ?ch1_vec = [bit[1] for bit in data]
> ? ?and_so_on = [bit[2] for bit in data]
>
> or even
>
> ? ?time_vec = []
> ? ?ch1_vec = []
> ? ?and_so_on = []
> ? ?for line in file('in.txt'):
> ? ? ?a,b,c = map(float, line.split())
> ? ? ?time_vec.append(a)
> ? ? ?ch1_vec.append(b)
> ? ? ?and_so_on.append(c)
>
> which could also be written as
>
> ? ?for line in file('in.txt'):
> ? ? ?line = line.split()
> ? ? ?time_vec.append(float(line[0]))
> ? ? ?ch1_vec.append(float(line[1]))
> ? ? ?and_so_on.append(float(line[2]))
>
> -tkc

Another way would be to use the csv module .

import csv
f = file.open("mytabfile.txt"


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 18:38:37 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 21:38:37 -0200
Subject: "import" not working?
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
	<02ed27ed-4b4f-41b2-b4b8-7914d3f13674@v39g2000yqm.googlegroups.com>
Message-ID: <op.uptvyn0jx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 18:10:07 -0200, Lionel <lionel.keene at gmail.com>  
escribi?:

> Taking "DataFileTypes.py" module out of the "...\site-packages
> \DataFileTypes" folder and placing it directly into the "site-
> packages" folder seems to have cleared it up. Some problem between
> package and module usage I suppose.

You're right. To import module "foo", the directory containing the  
"foo.py" file must be listed in sys.path.
To import package "foo", the directory containing the "foo" directory must  
be listed in sys.path; the foo directory itself must contain an  
"__init__.py" file.

-- 
Gabriel Genellina



From andrew at acooke.org  Mon Feb 23 18:41:55 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 20:41:55 -0300 (CLST)
Subject: Peculiar swap behavior
In-Reply-To: <474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
References: <E4C7BCAB1872014F81CEAACD25699B8C01187D2D@301081ANEX2.global.avaya.com>
	<474ac666ac46826d2be21d107a395dbc.squirrel@acooke.dyndns.org>
Message-ID: <c5d3da56fc059e0d3caaf81668870c6e.squirrel@acooke.dyndns.org>

andrew cooke wrote:
> Delaney, Timothy (Tim) wrote:
>> Tim Chase wrote:
>>> # swap list contents...not so much...
>>>  >>> m,n = [1,2,3],[4,5,6]
>>>  >>> m[:],n[:] = n,m
>>>  >>> m,n
>>> ([4, 5, 6], [4, 5, 6])
> [...]
>> For these types of things, it's best to expand the code out. The
>> appropriate expansion of:
>>     m,n = [1,2,3],[4,5,6]
>>     m[:],n[:] = n,m
>> is:
>>     m = [1,2,3]
>>     n = [4,5,6]
>>     m[:] = n
>>     n[:] = m
>> [...] OTOH, for:
>>     m,n = [1,2,3],[4,5,6]
>>     m[:],n[:] = n[:],m[:]
>> the expansion is more like:
>>     m = [1,2,3]
>>     n = [4,5,6]
>>     rhs1 = n[:]
>>     rhs2 = m[:]
>>     m[:] = rhs1
>>     n[:] = rhs2
>
> Maybe I'm just being stupid, but you don't seem to have explained
> anything.  Isn't the question: Why is the expansion different for the two
> cases?  Why don't both expand to have the intermediate rhs variables?

To answer my own question - you can rewrite all cases to use rhs1, rhs2.

The point is that when you do that: one case (m, n = n, m) reassigns
variables; one case (m[:], n[:] = n, m) mutates one list to be equal to
the other; one case (m[:], n[:] = n[:], m[:]) avoids seeing the effects of
the mutation because a copy is generated.

Which is what other people said, I guess.

Andrew




From rdmurray at bitdance.com  Mon Feb 23 18:42:39 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Mon, 23 Feb 2009 23:42:39 +0000 (UTC)
Subject: read csv error question
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
Message-ID: <gnvc9f$t4i$1@ger.gmane.org>

Vincent Davis <vincent at vincentdavis.net> wrote:
> I am trying to read a csv file from excel on a mac. I get the following
> error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
> field - do you need to open the file in universal-newline mode?
> I was using the example code
> import csv, sys
> 
> reader = csv.reader(open('/Volumes/vincentdavis
> 2/match/data/matchdata2008.csv', "rb"))
> try:
>     for row in reader:
>         print row
> except csv.Error, e:
>     sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
> I think this has to do with the end of line character but I am unsure how to
> fix it. I don't what to change the actual csv file I would like to fix the
> code.

You could try reading the error message and looking at the documentation
of the 'open' function.  Pay particular attention to the keywords
'universal-newline mode'.

Hint: 'rb' is almost the opposite of universal newline mode, and
it is very rare that you'd want to use 'b' to read a text file.

--RDM



From google at mrabarnett.plus.com  Mon Feb 23 18:43:05 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Mon, 23 Feb 2009 23:43:05 +0000
Subject: read csv error question
In-Reply-To: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
Message-ID: <49A33489.7060501@mrabarnett.plus.com>

Vincent Davis wrote:
> I am trying to read a csv file from excel on a mac. I get the following 
> error.
> SystemExit: file some.csv, line 1: new-line character seen in unquoted 
> field - do you need to open the file in universal-newline mode?
> I was using the example code
> import csv, sys
> 
> reader = csv.reader(open('/Volumes/vincentdavis 
> 2/match/data/matchdata2008.csv', "rb"))
> try:
>     for row in reader:
>         print row
> except csv.Error, e:
>     sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
> I think this has to do with the end of line character but I am unsure 
> how to fix it. I don't what to change the actual csv file I would like 
> to fix the code.
> 
FYI, Mac line endings are carriage-return '\r', Linux line endings are 
linefeed '\n', and Windows endings are _both_ '\r\n'.

Try:

     reader = csv.reader(open('/Volumes/vincentdavis 
2/match/data/matchdata2008.csv', "U")) # or "rU"

This will open the file for reading with "universal" line ending
support, which will accept any kind of these line endings. (Opening it
in text mode "r" should also work, assuming that the .csv file does
indeed have the correct line endings for that platform.)


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 18:47:46 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 21:47:46 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<39e19a010902222154m1d2af37vea53e17578331939@mail.gmail.com>
	<op.upsoosg1x6zn5v@gabriel.sleipnir-bsas>
	<6D420E20-FFC0-407B-ADCD-10D541E8C3CA@bryant.edu>
Message-ID: <op.uptwdwukx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 17:17:04 -0200, Brian Blais <bblais at bryant.edu>  
escribi?:
> On Feb 23, 2009, at 3:03 , Gabriel Genellina wrote:
>> En Mon, 23 Feb 2009 03:54:16 -0200, Denis Kasak
>> <denis.kasak at gmail.com> escribi?:
>>> On Mon, Feb 23, 2009 at 5:09 AM, Steven D'Aprano
>>> <steven at remove.this.cybersource.com.au> wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>>>
>>>> def swap(x, y):
>>>>    y, x = x, y
>>>>
>>>> a = 1
>>>> b = 2
>>>> swap(a, b)
>>>> assert a == 2 and b == 1
>>>>
>>>>
>>>> but you can't, it does not work. Ergo, parameter passing in
>>>> Python does
>>>> not have the same semantics as languages that use pass-by-
>>>> reference, such
>>>> as Pascal and Basic.
>>>
>>> You could, however, argue that the swap function doesn't work as
>>> expected (e.g. from a Pascal or a C++ POV) simply because the
>>> underlying objects aren't mutable.
>>
>> That's irrelevant - mutable and immutable objects are passed
>> exactly the same way.
>
> I don't think they were saying that mutable and immutable objects
> were handled differently.  They are different in terms of what a
> function can do to them (mutate them or no). Thus, if you can't
> mutate them, then the caller can't see any changes in the objects by
> actions in the function so the swap won't work: it doesn't mutate the
> objects at all.  In the case of a list or a dict, then one can mutate
> them, and the changes are seen in the caller.  In both cases, the
> object itself is passed the same way.

Ok, in any case, making such claims without explanation or restricting the  
sense, only confuses the matter (which is innecesarily confusing  
already...)

-- 
Gabriel Genellina



From benjamin.kaplan at case.edu  Mon Feb 23 18:52:43 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 23 Feb 2009 18:52:43 -0500
Subject: read csv error question
In-Reply-To: <49A33489.7060501@mrabarnett.plus.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
Message-ID: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>

On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:

> Vincent Davis wrote:
>
>> I am trying to read a csv file from excel on a mac. I get the following
>> error.
>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>> field - do you need to open the file in universal-newline mode?
>> I was using the example code
>> import csv, sys
>>
>> reader = csv.reader(open('/Volumes/vincentdavis
>> 2/match/data/matchdata2008.csv', "rb"))
>> try:
>>    for row in reader:
>>        print row
>> except csv.Error, e:
>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>
>> I think this has to do with the end of line character but I am unsure how
>> to fix it. I don't what to change the actual csv file I would like to fix
>> the code.
>>
>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
> linefeed '\n', and Windows endings are _both_ '\r\n'.
>

Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
Unix-based so it uses line feeds.



>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From bob at mellowood.ca  Mon Feb 23 19:00:36 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:00:36 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.583.1235428603.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
Message-ID: <gnvdb6$mf6$1@news.motzarella.org>


I'm getting hopelessly lost in a series of \\\\\\\ s :)

Let's see if this makes sense:

 >>> a='c:\\Program Files\\test'
 >>> a.decode('string-escape')
'c:\\Program Files\test'

In this case there are still 2 '\'s before the P; but only 1 before the 
't'. Now, when it comes time to open the file windows accepts double 
'\'s in the filename. So, life is fine. But, the essential part here is 
that we're lucky we can use '\\' or '\' in a path. What if this wasn't true?

The following shows a bit of difference:

 >>> a='c:\Program Files\test'
 >>> a
'c:\\Program Files\test'

In this case the interpreter has changed the '\P' to '\\P'. And if one 
lists the string the '\t' really is a tab. No decode() at all in any of 
this.

I guess the general rule would be to double up '\'s in filenames and (in 
my program's case) to use the \x20 for spaces.

Thanks.


From vincent at vincentdavis.net  Mon Feb 23 19:02:31 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 17:02:31 -0700
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <77e831100902231602v754d7ccbu4a36cb91aee08e1a@mail.gmail.com>

Thanks for the help the "U" was what I needed. I was reading the
documentation here.http://docs.python.org/library/csv.html
but I could not find the term universal-newline mode, In fact where do you
find "U" I have not read it word for word but it is not obvious to me. I do
even see anything about "rb" but I might just be really blind.

Thanks again

Vincent Davis



On Mon, Feb 23, 2009 at 4:52 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>>
>>> I am trying to read a csv file from excel on a mac. I get the following
>>> error.
>>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>>> field - do you need to open the file in universal-newline mode?
>>> I was using the example code
>>> import csv, sys
>>>
>>> reader = csv.reader(open('/Volumes/vincentdavis
>>> 2/match/data/matchdata2008.csv', "rb"))
>>> try:
>>>    for row in reader:
>>>        print row
>>> except csv.Error, e:
>>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>>
>>> I think this has to do with the end of line character but I am unsure how
>>> to fix it. I don't what to change the actual csv file I would like to fix
>>> the code.
>>>
>>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
>> linefeed '\n', and Windows endings are _both_ '\r\n'.
>>
>
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
> Unix-based so it uses line feeds.
>
>
>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From vincent at vincentdavis.net  Mon Feb 23 19:05:55 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Mon, 23 Feb 2009 17:05:55 -0700
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>
	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <77e831100902231605x50919aq472171c709136228@mail.gmail.com>

I just thought to look in the documentation for open() It seems this may
contain the answers to my questions. I am just to new to python to know
where my problem is,
Thanks
Vincent Davis
720-301-3003


On Mon, Feb 23, 2009 at 4:52 PM, Benjamin Kaplan
<benjamin.kaplan at case.edu>wrote:

>
>
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com> wrote:
>
>> Vincent Davis wrote:
>>
>>> I am trying to read a csv file from excel on a mac. I get the following
>>> error.
>>> SystemExit: file some.csv, line 1: new-line character seen in unquoted
>>> field - do you need to open the file in universal-newline mode?
>>> I was using the example code
>>> import csv, sys
>>>
>>> reader = csv.reader(open('/Volumes/vincentdavis
>>> 2/match/data/matchdata2008.csv', "rb"))
>>> try:
>>>    for row in reader:
>>>        print row
>>> except csv.Error, e:
>>>    sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>>>
>>> I think this has to do with the end of line character but I am unsure how
>>> to fix it. I don't what to change the actual csv file I would like to fix
>>> the code.
>>>
>>>  FYI, Mac line endings are carriage-return '\r', Linux line endings are
>> linefeed '\n', and Windows endings are _both_ '\r\n'.
>>
>
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X is
> Unix-based so it uses line feeds.
>
>
>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From google at mrabarnett.plus.com  Mon Feb 23 19:08:51 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 24 Feb 2009 00:08:51 +0000
Subject: read csv error question
In-Reply-To: <ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com>	<49A33489.7060501@mrabarnett.plus.com>
	<ec96e1390902231552w9ad7267lcd1d6f46c1fd9540@mail.gmail.com>
Message-ID: <49A33A93.7080403@mrabarnett.plus.com>

Benjamin Kaplan wrote:
> 
> 
> On Mon, Feb 23, 2009 at 6:43 PM, MRAB <google at mrabarnett.plus.com 
> <mailto:google at mrabarnett.plus.com>> wrote:
> 
>     Vincent Davis wrote:
> 
>         I am trying to read a csv file from excel on a mac. I get the
>         following error.
>         SystemExit: file some.csv, line 1: new-line character seen in
>         unquoted field - do you need to open the file in
>         universal-newline mode?
>         I was using the example code
>         import csv, sys
> 
>         reader = csv.reader(open('/Volumes/vincentdavis
>         2/match/data/matchdata2008.csv', "rb"))
>         try:
>            for row in reader:
>                print row
>         except csv.Error, e:
>            sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
> 
>         I think this has to do with the end of line character but I am
>         unsure how to fix it. I don't what to change the actual csv file
>         I would like to fix the code.
> 
>     FYI, Mac line endings are carriage-return '\r', Linux line endings
>     are linefeed '\n', and Windows endings are _both_ '\r\n'.
> 
> 
> Just to clarify, only the old Mac OSes (1-9) use carriage returns. OS X 
> is Unix-based so it uses line feeds.
> 
Slightly OT, but PPD files on Macs used to work whatever the line
endings (as they should, according to the spec), but at some point on
MacOS X they broke that and PPD files would work only with CR line
endings. I don't know if they've fixed that. Anyway, although it's Unix
underneath I'm not so sure that they don't use CR line endings elsewhere
for backwards compatibility.


From andrew at acooke.org  Mon Feb 23 19:10:31 2009
From: andrew at acooke.org (andrew cooke)
Date: Mon, 23 Feb 2009 21:10:31 -0300 (CLST)
Subject: more on unescaping escapes
In-Reply-To: <gnvdb6$mf6$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
Message-ID: <1e4355c5c39776c0e4364f9becf45acc.squirrel@localhost>


do you know that a string with the letter "r" in front doesn't escape
slashes?  it's intended for regular expressions, but would simplify things
for you here too.

just do

  a=r'c:\\Program Files\test'

andrew


bvdp wrote:
>
> I'm getting hopelessly lost in a series of \\\\\\\ s :)
>
> Let's see if this makes sense:
>
>  >>> a='c:\\Program Files\\test'
>  >>> a.decode('string-escape')
> 'c:\\Program Files\test'
>
> In this case there are still 2 '\'s before the P; but only 1 before the
> 't'. Now, when it comes time to open the file windows accepts double
> '\'s in the filename. So, life is fine. But, the essential part here is
> that we're lucky we can use '\\' or '\' in a path. What if this wasn't
> true?
>
> The following shows a bit of difference:
>
>  >>> a='c:\Program Files\test'
>  >>> a
> 'c:\\Program Files\test'
>
> In this case the interpreter has changed the '\P' to '\\P'. And if one
> lists the string the '\t' really is a tab. No decode() at all in any of
> this.
>
> I guess the general rule would be to double up '\'s in filenames and (in
> my program's case) to use the \x20 for spaces.
>
> Thanks.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:11:54 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:11:54 -0200
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
Message-ID: <op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 15:54:03 -0200, <rdmurray at bitdance.com> escribi?:
> Stef Mientki <stef.mientki at gmail.com> wrote:

>> but I was looking for a more general solution,
>> in which I don't change the program itself,
>> and where the error messages (in general) become more informative than
>> it is by default.
> No you are not the only one who wishes the error messages were
> more informative.  In one complex application I had, I made my life
> easier with a hack I copied from Zope.  Briefly, at the top level
> of the program I trap all exceptions, get the traceback object from
> sys.exc_info, format it with format_tb, and then process it to add info.
> I applied several enhancements, but the one relevant to you was to grab
> the locals dictionary from the last frame of the traceback, and use a
> regex to split the last source line in the formatted traceback up into
> candidate variable names.  Then I printed the name and the repr of the
> value of any of those names I found in the locals dict.

Have you seen the cgitb module? Despite its name, it's a general purpose  
module.

<http://docs.python.org/library/cgitb.html>

<code>
import cgitb
cgitb.enable(format="txt")

def f(some_list, x, y):
   return some_list[x + y]

def g(a):
   return f(a, 1, 2) - f(a, 3, 4)

g([1,2,3,4])

</code>

Output:
<type 'exceptions.IndexError'>
Python 2.6: c:\apps\python26\python.exe
Mon Feb 23 22:06:22 2009

A problem occurred in a Python script.  Here is the sequence of function  
calls leading up to the error, in the order they occurred.

  C:\TEMP\test_cgitb.py in <module>()
     8   return f(a, 1, 2) - f(a, 3, 4)
     9
    10 g([1,2,3,4])
    11
    12
g = <function g at 0x00B9FB70>

  C:\TEMP\test_cgitb.py in g(a=[1, 2, 3, 4])
     6
     7 def g(a):
     8   return f(a, 1, 2) - f(a, 3, 4)
     9
    10 g([1,2,3,4])
global f = <function f at 0x00B9FB30>
a = [1, 2, 3, 4]

  C:\TEMP\test_cgitb.py in f(some_list=[1, 2, 3, 4], x=3, y=4
)
     3
     4 def f(some_list, x, y):
     5   return some_list[x + y]
     6
     7 def g(a):
some_list = [1, 2, 3, 4]
x = 3
y = 4
<type 'exceptions.IndexError'>: list index out of range
     __class__ = <type 'exceptions.IndexError'>
     [..]
     args = ('list index out of range',)
     message = 'list index out of range'

The above is a description of an error in a Python program. Here is the  
original traceback:

Traceback (most recent call last):
   File "test_cgitb.py", line 10, in <module>
     g([1,2,3,4])
   File "test_cgitb.py", line 8, in g
     return f(a, 1, 2) - f(a, 3, 4)
   File "test_cgitb.py", line 5, in f
     return some_list[x + y]
IndexError: list index out of range


-- 
Gabriel Genellina



From tim.wintle at teamrubber.com  Mon Feb 23 19:13:06 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Tue, 24 Feb 2009 00:13:06 +0000
Subject: more on unescaping escapes
In-Reply-To: <gnvdb6$mf6$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
Message-ID: <1235434386.6125.4.camel@tim-laptop>

On Mon, 2009-02-23 at 17:00 -0700, bvdp wrote:
> Let's see if this makes sense:
> 
>  >>> a='c:\\Program Files\\test'
>  >>> a.decode('string-escape')
> 'c:\\Program Files\test'

Hint: try running

>>> print a

and see what's written - I think that the interpreter adds extra "\"
characters to escape things and make things more easy to read.

i.e. 

>>> a = "c:\\test\\t"
>>> a
'c:\\test\\t'
>>> print a
c:\test\t
>>> 

so when it displays strings in the interpreter it includes escape
characters, when it is printed though the output is straight to stdout
and isn't escaped.

Hope that helps,

Tim Wintle




From bob at mellowood.ca  Mon Feb 23 19:18:24 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:18:24 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.602.1235434237.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.602.1235434237.11746.python-list@python.org>
Message-ID: <gnvecg$mc$1@news.motzarella.org>

andrew cooke wrote:
> do you know that a string with the letter "r" in front doesn't escape
> slashes?  it's intended for regular expressions, but would simplify things
> for you here too.
> 
> just do
> 
>   a=r'c:\\Program Files\test'
> 

Yes, I knew that. Unfortunately in my program loop I really don't have 
the opportuity to use a raw string.

But, good reminder. Thanks.



From harijay at gmail.com  Mon Feb 23 19:18:31 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 16:18:31 -0800 (PST)
Subject: getting at individual bits inside byte field: struct module : bitwise
	operator
Message-ID: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>

In my last post I had asked about reading data from a binary file
using the struct module.
Thanks to some excellent help , I have managed to read in
successfully
most of the header of this binary format that I want to parse.  These
are some time-voltage traces from a digital
to analog converter for my experiments. The output is according to a
format
mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)

I have a question about how to bitmask a bunch of bytes read in from
such a binary formatted file .

For eg the spec says the first two bytes have different parameters in
different bits .
Byte 1                                                  Byte 0
SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
SD2     SD1     SD0     T4      T3      T2      T1      T0

I am reading in the two bytes using the following code

import struct
f.seek(0)
element1_format = struct.Struct("<H")
(element1,) = element1_format.unpack(f.read(2))

Now element1 has type "str" . How do I apply a bitmask to this to get
at information in the component bits .
Since the entire file format has many such bitmasked fields and since
this is my first venture into binary formats and c-type structs , I
wanted to know how to read values inside a byte using python.
My few tries at using bitwise operators ( element1 & 0x001f) are
frustrated by messages that say " unsupported operand type(s) for &:
'str' and 'int' " .
How can I keep my string objects as bits and apply bitmasks to them
Any help in this will be greatly appreciated.
Thanks
hari


From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:18:50 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:18:50 -0000
Subject: "import" not working?
In-Reply-To: <da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
References: <f644ec4f-46ba-43ee-805a-5b4afa349cef@v39g2000yqm.googlegroups.com>
	<mailman.388.1235173938.11746.python-list@python.org>
	<7f0d1540-ae7e-4da1-936e-afbc8c6d2d49@k19g2000yqg.googlegroups.com>
	<11062739-5a43-43d8-b4a2-9bd494230992@t13g2000yqc.googlegroups.com>
	<65f8a016-a4c1-48c0-8128-47f62b865a6f@m40g2000yqh.googlegroups.com>
	<mailman.408.1235205469.11746.python-list@python.org>
	<da9e6d8c-cc6f-40ab-852f-c8876578a08b@w35g2000yqm.googlegroups.com>
Message-ID: <op.uptxtoora8ncjz@gnudebst>

On Mon, 23 Feb 2009 19:24:46 -0000, Lionel <lionel.keene at gmail.com> wrote:

> sys.path.append("C:\DataFileTypes")

Just so that we're clear, this is a *really* *bad* habit to get
into.  Not appending to sys.path, though that isn't often a good
idea, but failing to escape your backslashes.  This works because
'\D' happens not to be a valid escape sequence: if your directory
had instead been called "newtypes" then "C:\newtypes" would not
have had the result you were expecting at all.  If you really
mean a backslash to be in any literal string, you should always
double it:

sys.path.append("C:\\DataFileTypes")

IMHO, Python is somewhat inconsistent in not producing a
compile-type error (or at least an annoying compile-time
warning) when presented with invalid escape sequences.
What it does, even though it's well-documented and usually
the right guess, is to encourage bad habits.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 23 19:19:19 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:19:19 -0800
Subject: Need to store dictionary in file
In-Reply-To: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
References: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
Message-ID: <50697b2c0902231619ub603332w1890bdbd68f7f455@mail.gmail.com>

On Mon, Feb 23, 2009 at 12:38 PM, S.Selvam Siva <s.selvamsiva at gmail.com> wrote:
> Hi all,
>
> I have a dictionary in which each key is associated with a list as value.
>
> eg: dic={'a':['aa','ant','all']}
>
> The dictionary contains 1.5 lakh keys.

Tip: You might not want to use the "lakh" in international media such
as internet mailinglists since it's rather
Indian-subcontinent-specific and most people will be unfamiliar with
it.
I only know of it from coincidentally editing the Wikipedia article on
it a while ago.

To everyone else, that's 150,000 keys (150K if you wanna be metric about it).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Mon Feb 23 19:23:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:23:54 -0800
Subject: Can someone tell me why i get None at the end please this has me 
	stuck for ages
In-Reply-To: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <50697b2c0902231623v6cb1c137u1d52897f1c4ec576@mail.gmail.com>

On Mon, Feb 23, 2009 at 11:22 AM, Gary Wood <woodygar at sky.com> wrote:
> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
>
>
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()

Reiterating myself from your previous thread which this is a duplicate of:

You're not supposed to *output* the strings in joinStrings() [i.e.
don't use print()!], you've supposed to *combine* them and *return*
the single combined string (it's nearly identical to how you summed
the numbers in the earlier exercise). The actual outputting of the
combined string is done by the calls to print() *outside* of
joinStrings(), in main().

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 19:26:29 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:26:29 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.604.1235434399.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
Message-ID: <gnvern$6a5$1@news.motzarella.org>

Tim Wintle wrote:
> On Mon, 2009-02-23 at 17:00 -0700, bvdp wrote:
>> Let's see if this makes sense:
>>
>>  >>> a='c:\\Program Files\\test'
>>  >>> a.decode('string-escape')
>> 'c:\\Program Files\test'
> 
> Hint: try running
> 
>>>> print a
> 
> and see what's written - I think that the interpreter adds extra "\"
> characters to escape things and make things more easy to read.
> 
> i.e. 
> 
>>>> a = "c:\\test\\t"
>>>> a
> 'c:\\test\\t'
>>>> print a
> c:\test\t
> 
> so when it displays strings in the interpreter it includes escape
> characters, when it is printed though the output is straight to stdout
> and isn't escaped.
> 
> Hope that helps,
> 
> Tim Wintle

Not sure if it's more clear or not :)

 >>> a="c:\\Program\x20Files\\test"
 >>> a
'c:\\Program Files\\test'
 >>> print a
c:\Program Files\test

Which is all fine. And I didn't need to use decode().

So, in this case I'm assuming that the interpreter is converting the 
escapes on assignment. And, in this case the string has single \s in it.

So far this is making sense. So, when I do a decode() the \t is 
converted to a tab, etc.

I think my "problem" may be in viewing an assignment like that above as 
opposed to reading a line from a file with '\'s and '\x20's in it. In 
this case the assignment doesn't do the conversion (and that is a good 
thing!). Now, when I go to save the variable with the escapes I use 
decode() and it works.

Just a matter of consistantly using a method I suppose. Still, confusing 
between my program reading data from a file and doing testing of strings 
at the interpreter. Best to do one or the other, not both.







From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:32:18 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:32:18 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnv6jn$4nh$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
Message-ID: <op.uptyf4z1a8ncjz@gnudebst>

On Mon, 23 Feb 2009 22:05:42 -0000, bvdp <bob at mellowood.ca> wrote:

>
> So, we think something is working and send of a bug fix to our client :)
>
> I'm not sure I understand this at all and wonder if there is bug?
>
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
>
> so far, so good.
>
>  >>> a.decode("string-escape")
> 'c:\\Program Files\test'
>
> Umm, not so good? The \\ before the P is okay, but the \\t is change to  
> \t

Well yes, that's what you asked it to do.  The "string-escape" decoder
reads the string and replaces escape sequences with the corresponding
characters.  Bear in mind that it's the string as it really is that is
being operated on, not the representation of it that you displayed
above.  In other words:

b = a.decode("string-escape")

is equivalent to:

b = "C:\Program Files\test"

"\P" isn't a valid escape sequence, so it doesn't get replaced.  "\t"
represents a tab, so it does.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From clp2 at rebertia.com  Mon Feb 23 19:32:48 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:32:48 -0800
Subject: intermediate python csv reader/writer question from a beginner
In-Reply-To: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
References: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
Message-ID: <50697b2c0902231632s76bfb28gff055b92bf725411@mail.gmail.com>

On Mon, Feb 23, 2009 at 1:33 PM, Learning Python <labmice at gmail.com> wrote:
> anything related to csv, I usually use VB within excel to manipulate
> the data, nonetheless, i finally got the courage to take a dive into
> python.  i have viewed a lot of googled csv tutorials, but none of
> them address everything i need.  Nonetheless, I was wondering if
> someone can help me manipulate the sample csv (sample.csv) I have
> generated:

For reading and writing CSV files, see the `csv` module in the
standard library (http://docs.python.org/library/csv.html).

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:35:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:35:14 -0200
Subject: Can someone tell me why i get None at the end please this has me
	stuck for ages
References: <D72B724FA1E140E4B0C57D0D3C6DDE44@Woodygar>
Message-ID: <op.uptyk0eyx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 17:22:16 -0200, Gary Wood <woodygar at sky.com> escribi?:

> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     word = [items]
>     for item in items:
>          print (item, end='')
> def main():
>     print(joinStrings(['very', 'hot','day']))
>     print(joinStrings(['this', 'is','it']))
>     print(joinStrings(['1', '2', '3', '4', '5']))
>
> main()

See this:

py> def sum(a, b):
...   "Returns the sum of two numbers"
...   print a+b
...
py> print sum(2,3)
5
None

The function above does *not* do what is expected. It should compute a+b  
AND RETURN THE RESULT (instead, it PRINTS the result and returns nothing,  
None in Python parlance). It's up to the caller to decide what to do with  
the resultant value; if he wants to print it, fine; but maybe he wants to  
carry on other operations:

py> print sum(2,3) * 4
5
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

If the function claims to *return* something, it should return that thing:

py> def sum(a, b):
...   "Returns the sum of two numbers"
...   return a+b
...
py> print sum(2,3)
5
py> print sum(2,3) * 4
20

Back to your exercise, you have to join the strings together WITHOUT USING  
PRINT. You have to build a NEW string, joining the pieces one by one, and  
return the new, concatenated string. If I'm not mistaken, there were some  
clues in the exercise statement that you're ignoring and should help a lot.

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:37:11 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:37:11 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnvern$6a5$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <op.uptyn9y7a8ncjz@gnudebst>

On Tue, 24 Feb 2009 00:26:29 -0000, bvdp <bob at mellowood.ca> wrote:

> So, in this case I'm assuming that the interpreter is converting the  
> escapes on assignment.

The compiler converts the escapes on creating its internal
representation of the string, before assignment ever gets
involved.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From python at bdurham.com  Mon Feb 23 19:37:15 2009
From: python at bdurham.com (python at bdurham.com)
Date: Mon, 23 Feb 2009 19:37:15 -0500
Subject: can error messages be improved or can they be overridden ?
In-Reply-To: <op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<op.uptxh4dfx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1235435835.25504.1302013015@webmail.messagingengine.com>

Gabriel,

> Have you seen the cgitb module? Despite its name, it's a general purpose module.
> <http://docs.python.org/library/cgitb.html>
> 
> import cgitb
> cgitb.enable(format="txt")
> 
> <snipped>

My vote for tip of the week, perhaps even month.

I'm not part of this thread, but your post is a great help on another
project.

Thank you!

Regards,
Malcolm


From google at mrabarnett.plus.com  Mon Feb 23 19:40:09 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Tue, 24 Feb 2009 00:40:09 +0000
Subject: getting at individual bits inside byte field: struct module :
	bitwise	operator
In-Reply-To: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <49A341E9.8080107@mrabarnett.plus.com>

harijay wrote:
> In my last post I had asked about reading data from a binary file
> using the struct module.
> Thanks to some excellent help , I have managed to read in
> successfully
> most of the header of this binary format that I want to parse.  These
> are some time-voltage traces from a digital
> to analog converter for my experiments. The output is according to a
> format
> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
> 
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
> 
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
> 
> I am reading in the two bytes using the following code
> 
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
> 
> Now element1 has type "str" .

That's not what I get. For me it's an int.

> How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .
> How can I keep my string objects as bits and apply bitmasks to them
> Any help in this will be greatly appreciated.
 >
The T bits are (element1 & 0x1F), the SD bits are ((element1 >> 5) &
0x2FF) and the SN16 bit is (element1 >> 15).


From clp2 at rebertia.com  Mon Feb 23 19:41:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 16:41:50 -0800
Subject: more on unescaping escapes
In-Reply-To: <gnvern$6a5$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <50697b2c0902231641l5f0938c5j59441cc8400ed560@mail.gmail.com>

On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
[problem with Python and Windows paths using backslashes]

Is there any particular reason you can't just internally use regular
forward-slashes for the paths? They work in Windows from Python in
nearly all cases and you can easily interconvert using os.pathsep if
you want the path to be pretty when you show it to (or get it from)
the user or whatever.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bob at mellowood.ca  Mon Feb 23 19:46:34 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:46:34 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.614.1235436113.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
Message-ID: <gnvg1a$g7g$1@news.motzarella.org>

Chris Rebert wrote:
> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
> [problem with Python and Windows paths using backslashes]
> 
> Is there any particular reason you can't just internally use regular
> forward-slashes for the paths? They work in Windows from Python in
> nearly all cases and you can easily interconvert using os.pathsep if
> you want the path to be pretty when you show it to (or get it from)
> the user or whatever.
> 
> Cheers,
> Chris
> 

Just because I never really thought too much about it :) I'm doing my 
work on a linux box and my user is on windows ... and he's used to using 
'\' ... but, you are absolutely right! Just use '/' on both systems and 
be done with it. Of course I still need to use \x20 for spaces, but that 
is easy.

Thanks for the suggestion!


From bob at mellowood.ca  Mon Feb 23 19:48:32 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 17:48:32 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.608.1235435546.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.608.1235435546.11746.python-list@python.org>
Message-ID: <gnvg50$g7g$2@news.motzarella.org>


> Bear in mind that it's the string as it really is that is
> being operated on, not the representation of it that you displayed

Yes, that is the confusion ... what is displayed and what's actually in 
the string.

I think I understand it all now :)

Thanks.



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:54:45 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:54:45 -0000
Subject: Python AppStore / Marketplace
In-Reply-To: <gnv6vs$bm7$1@ger.gmane.org>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<gnrn0o$4ju$1@ger.gmane.org> <49A311C3.80707@gmail.com>
	<gnv6vs$bm7$1@ger.gmane.org>
Message-ID: <op.uptzhjvya8ncjz@gnudebst>

On Mon, 23 Feb 2009 22:12:09 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> Michael Torrie wrote:
>> Steve Holden wrote:
>>> Unfortunately I have no idea what a "souq" is, so I suspect this may be
>>> linguistically biased against English speakers. Or perhaps I'm just
>>> ignorant.
>>
>> Nah.  Not biased against English speakers.  Just biased against the
>> un-traveled.  :)
>
> Don't think so. I've visited roughly twenty-five difference countries
> and traveled I-don't-know-how-many miles, but certainly over a million.
> Unless you'd like to redefine "un-traveled" ... ?
>
> But I do (still) speak English (of a kind).

A souq is a bazaar :-)

Well, close enough anyway.  It's another arabic word that translates as
"market" in both the mercantile and financial senses, I believe.  Maybe
I've just read too much arabic-themed fiction, but I was surprised not
to find the word in my trusty Chambers.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 19:55:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 22:55:16 -0200
Subject: getting at individual bits inside byte field: struct module :
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <op.uptziemfx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:18:31 -0200, harijay <harijay at gmail.com> escribi?:

> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
>
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
>
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
>
> I am reading in the two bytes using the following code
>
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
>
> Now element1 has type "str" .

No, should be type 'int', that's what the H format means.

> How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .

Try again - it should work. Perhaps you used the wrong variable name?  
instead of the resultant from struct.unpack

py> import struct
py> element1_format = struct.Struct("<H")
py> (element1,) = element1_format.unpack('AB')
py> element1
16961
py> element1 & 0x007F
65
py> chr(65)
'A'

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 19:56:36 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 00:56:36 -0000
Subject: more on unescaping escapes
In-Reply-To: <gnvg1a$g7g$1@news.motzarella.org>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
Message-ID: <op.uptzkmc1a8ncjz@gnudebst>

On Tue, 24 Feb 2009 00:46:34 -0000, bvdp <bob at mellowood.ca> wrote:

> Just because I never really thought too much about it :) I'm doing my  
> work on a linux box and my user is on windows ... and he's used to using  
> '\' ... but, you are absolutely right! Just use '/' on both systems and  
> be done with it. Of course I still need to use \x20 for spaces, but that  
> is easy.

Erm, no.  "\x20" is exactly the same as " " in a string literal.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From jjposner at snet.net  Mon Feb 23 19:58:44 2009
From: jjposner at snet.net (John Posner)
Date: Mon, 23 Feb 2009 16:58:44 -0800 (PST)
Subject: Peculiar swap behavior
Message-ID: <480179.92204.qm@web83107.mail.mud.yahoo.com>

>>      m,n = [1,2,3],[4,5,6]
>>      m[:],n[:] = n,m

I believe this is an RTFM situation. In the Python 2.6.1 help topic "Simple Statements" > "Assignment Statements", see this para:
<snip>
If the target is a slicing: The primary expression in the reference is evaluated. It should yield a mutable sequence object (such as a list). The assigned object should be a sequence object of the same type. Next, the lower and upper bound expressions are evaluated, insofar they are present; defaults are zero and the sequence?s length. The bounds should evaluate to (small) integers. If either bound is negative, the sequence?s length is added to it. The resulting bounds are clipped to lie between zero and the sequence?s length, inclusive. Finally, the sequence object is asked to replace the slice with the items of the assigned sequence. The length of the slice may be different from the length of the assigned sequence, thus changing the length of the target sequence, if the object allows it.
</snip>
The crucial sentence is:
     Finally, the sequence object is asked to replace the slice with the items
     of the assigned sequence.
In our example, this means that the assignment of the 3-item slicing
    m[:] = n
... has this result:
 * the identifier m[0] now refers to the same object as the identifier n[0]
 * the identifier m[1] now refers to the same object as the identifier n[1]
 * the identifier m[2] now refers to the same object as the identifier n[2]
Although m and n are still different list objects, all of the "slots" in both lists now contain the same (sub)objects.
I've verified the above analysis to my own satisfaction using IDLE 2.6.1:
---------
def list_ids(mylist):
    return id(mylist), map(id, mylist)
    
m,n = [1,2,3],[4,5,6]
print m,n

print "m:", list_ids(m)
print "n:", list_ids(n)

m[:], n[:] = n, m
print m,n

print "m:", list_ids(m)
print "n:", list_ids(n)
---------

output:

[1, 2, 3] [4, 5, 6]
m: (4589728, [10970688, 10970676, 10970664])
n: (11311344, [10970652, 10970640, 10970628])
[4, 5, 6] [4, 5, 6]
m: (4589728, [10970652, 10970640, 10970628])
n: (11311344, [10970652, 10970640, 10970628])


-John
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From mwilson at the-wire.com  Mon Feb 23 20:03:28 2009
From: mwilson at the-wire.com (Mel)
Date: Mon, 23 Feb 2009 20:03:28 -0500
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
Message-ID: <gnvh0m$15m9$1@services.telesweet.net>

bvdp wrote:
> Not sure if it's more clear or not :)
> 
>  >>> a="c:\\Program\x20Files\\test"
>  >>> a
> 'c:\\Program Files\\test'
>  >>> print a
> c:\Program Files\test
> 
> Which is all fine. And I didn't need to use decode().
> 
> So, in this case I'm assuming that the interpreter is converting the
> escapes on assignment. And, in this case the string has single \s in it.

Strictly speaking, the compiler is converting the escapes when it uses the
literal to create a string value.

        Mel.



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:14:42 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:14:42 -0200
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
Message-ID: <op.upt0esahx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:

> Chris Rebert wrote:
>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
>> [problem with Python and Windows paths using backslashes]
>>  Is there any particular reason you can't just internally use regular
>> forward-slashes for the paths? They work in Windows from Python in
>> nearly all cases and you can easily interconvert using os.pathsep if
>> you want the path to be pretty when you show it to (or get it from)
>> the user or whatever.
>
> Just because I never really thought too much about it :) I'm doing my  
> work on a linux box and my user is on windows ... and he's used to using  
> '\' ... but, you are absolutely right! Just use '/' on both systems and  
> be done with it. Of course I still need to use \x20 for spaces, but that  
> is easy.

Why is that? "\x20" is exactly the same as " ". It's not like %20 in URLs,  
that becomes a space only after decoding.

py> '\x20' == ' '
True
py> '\x20' is ' '
True

(ok, the last line might show False, but being True means that both are  
the very same object)

-- 
Gabriel Genellina



From rhodri at wildebst.demon.co.uk  Mon Feb 23 20:29:17 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Tue, 24 Feb 2009 01:29:17 -0000
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
In-Reply-To: <E306DE3F7B904BF094575153877180B6@Woodygar>
References: <E306DE3F7B904BF094575153877180B6@Woodygar>
Message-ID: <op.upt023w3a8ncjz@gnudebst>

On Mon, 23 Feb 2009 23:33:31 -0000, Gary Wood <woodygar at sky.com> wrote:

> '''exercise to complete and test this function'''
> import string
> def joinStrings(items):
>     '''Join all the strings in stringList into one string,
>     and return the result. For example:
>     >>> print joinStrings(['very', 'hot', 'day'])
>     'veryhotday'
>     '''
>     for i in items:
>        return (''.join(items))

As I'm sure your teacher will point out, this is sub-optimal :-)
That for-loop isn't doing anything, because you always return
out of it at the first iteration.

I suspect that you're expected to concatenate the strings
together by hand and return the resulting string once you've
done them all.  Trying writing it that way.

PS: it helps a lot if what you say in the doc string matches
what you write in the rest of the code.  In this case you
call your input string "items", but then say "Join all the
strings in *stringList*..."

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From bob at mellowood.ca  Mon Feb 23 20:31:20 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 18:31:20 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.618.1235438099.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>	<mailman.614.1235436113.11746.python-list@python.org>	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
Message-ID: <gnvila$fne$1@news.motzarella.org>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
> 
>> Chris Rebert wrote:
>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
>>> [problem with Python and Windows paths using backslashes]
>>>  Is there any particular reason you can't just internally use regular
>>> forward-slashes for the paths? They work in Windows from Python in
>>> nearly all cases and you can easily interconvert using os.pathsep if
>>> you want the path to be pretty when you show it to (or get it from)
>>> the user or whatever.
>>
>> Just because I never really thought too much about it :) I'm doing my 
>> work on a linux box and my user is on windows ... and he's used to 
>> using '\' ... but, you are absolutely right! Just use '/' on both 
>> systems and be done with it. Of course I still need to use \x20 for 
>> spaces, but that is easy.
> 
> Why is that? "\x20" is exactly the same as " ". It's not like %20 in 
> URLs, that becomes a space only after decoding.
> 
> py> '\x20' == ' '
> True
> py> '\x20' is ' '
> True
> 
> (ok, the last line might show False, but being True means that both are 
> the very same object)
> 

I need to use the \x20 because of my parser. I'm reading unquoted lines 
from a file. The file creater needs to use the form "foo\x20bar" without 
the quotes in the file so my parser can read it as a single token. 
Later, the string/token needs to be decoded with the \x20 converted to a 
space.

So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar" 
is one.

So, it's not really a problem of what happens when you assign a string 
in the form "foo bar", rather how to convert the \x20 in a string to a 
space. I think the \\ just complicates the entire issue.


From rdmurray at bitdance.com  Mon Feb 23 20:40:59 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Tue, 24 Feb 2009 01:40:59 +0000 (UTC)
Subject: can error messages be improved or can they be overridden ?
References: <49A1567B.5020407@gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF62783D690@enbmail01.lsi.com>
	<49A272F1.7090004@gmail.com> <gnunrq$eov$1@ger.gmane.org>
	<9afda87e04d99d252c989c08ade7699f.squirrel@acooke.dyndns.org>
Message-ID: <gnvj7a$83k$1@ger.gmane.org>

"andrew cooke" <andrew at acooke.org> wrote:
> rdmurray at bitdance.com wrote:
> [...]
> > (You know, I really ought to revisit that routine and make it part
> > of my standard development toolbox.)
> 
> please post it....

OK.  I dug it up, cut out the stuff that was specific to the application,
freshened it up a little, and added a little demo.  I don't claim this
is the best possible way to do this (it certainly could be made smarter,
possibly by using python facilities to actually parse the line; right
now it takes a very brute force approach to trying to find variables),
but it served my purposes and perhaps it will help others.

Oh, yeah, and I just added the globals bit without thoroughly testing
it...I think it probably doesn't help much and may be misleading when
the traceback is thrown in an imported module.

Enjoy.

--RDM

------------------------------------------------------------------
from traceback import format_tb, format_exception_only
from sys import exc_info
from re import compile
varsplitter = compile("[^0-9a-zA-Z_]")

def format_exception():
    """
    Add a dump of any variables we can identify from the failing program
    line to the end of the traceback.  The deep mojo for doing this came
    from an example in the Zope core plus documentation in the Python
    Quick Reference.
    """
    etype, value, tb = exc_info()
    plaintb = format_tb(tb)
    result=['Traceback (innermost last):']
    for line in plaintb:
        result.append(line)
        f = tb.tb_frame
        tb = tb.tb_next
    locals=f.f_locals
    vars = varsplitter.split(line.split('\n')[-2])
    dvars = set()
    self = None
    if 'self' in locals: self = locals['self']
    for v in vars:
        if v in dvars: continue
        dvars.add(v)
        if v in locals:
            result.append('      %s: %r\n' % (v,locals[v]))
        if self and hasattr(self, v):
            result.append('      self.%s: %r\n' % (v,getattr(self, v)))
        if v in globals():
            result.append('      (global) %s: %r\n' % (v,globals()[v]))
    result.extend(format_exception_only(etype, value))
    return ''.join(result)


class Demo:
    y = 200
    def __init__(self, x):
        self.x = x

    def bad(self):
        x = [1, 2]
        y = (5, 9, 9)
        y[1] = x[2] + foo

foo = 'a value'

def main():
    bar = Demo('some value')
    bar.bad()

  
if __name__=='__main__':
    try: main()
    except Exception:
        print format_exception()

------------------------------------------------------------------
rdmurray at maestro:~>python tb.py
Traceback (innermost last):  File "tb.py", line 56, in <module>
    try: main()
  File "tb.py", line 52, in main
    bar.bad()
  File "tb.py", line 46, in bad
    y[1] = x[2] + foo
      y: (5, 9, 9)
      self.y: 200
      x: [1, 2]
      self.x: 'some value'
      (global) foo: 'a value'
IndexError: list index out of range
------------------------------------------------------------------



From mcrute at gmail.com  Mon Feb 23 20:41:59 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 20:41:59 -0500
Subject: Code in __init__.py, is it bad form?
Message-ID: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>

Is it bad form (i.e. non-pythonic) to have code in your __init__.py
files? I know this is subjective so I'm just looking for the general
consensus. I've heard both sides of the story and I personally feel
its okay if the code pertains to the whole module but have an open
mind about the matter. If you object to code in __init__.py why, and
what alternatives do you propose?

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:47:43 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:47:43 -0200
Subject: Need to store dictionary in file
References: <b423b9550902231238x1cef9698g82f2227e0d2e68@mail.gmail.com>
Message-ID: <op.upt1xtdjx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 18:38:56 -0200, S.Selvam Siva <s.selvamsiva at gmail.com>  
escribi?:

> I have a dictionary in which each key is associated with a list as value.
>
> eg: *dic={'a':['aa','ant','all']}*
>
> The dictionary contains *1.5 lakh keys*.
> Now i want to store it to a file,and need to be loaded to python program
> during execution.
> I expect your ideas/suggestions.
>
> Note:I think cPickle,bsddb can be used for this purpose,but i want to  
> know
> the best solution which runs *faster*.

Just try and see. You have to measure performance in your own specific use  
case. What is best for others may not be the best for you; for example,  
your dictionary appears to contain only strings, and this may affect  
performance.

I would try:

cPickle with protocol=-1
a cPickle.Pickler object with protocol=-1 , also setting fast=1 in the  
instance
the csv module
a SQL database, like sqlite
bsddb
a custom format, perhaps one word per line + blank line as separator.

But I would reconsider if having the whole dictionary in memory all the  
time is a good idea. Databases are good for storing and retrieving  
key->values.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 20:54:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 23 Feb 2009 23:54:18 -0200
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
	<gnvila$fne$1@news.motzarella.org>
Message-ID: <op.upt18svjx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <bob at mellowood.ca> escribi?:
> Gabriel Genellina wrote:
>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
>>> Chris Rebert wrote:
>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:

>>>> [problem with Python and Windows paths using backslashes]
>>>>  Is there any particular reason you can't just internally use regular
>>>> forward-slashes for the paths? [...]
>>>
>>> you are absolutely right! Just use '/' on both systems and be done  
>>> with it. Of course I still need to use \x20 for spaces, but that is  
>>> easy.
>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in  
>> URLs, that becomes a space only after decoding.
>
> I need to use the \x20 because of my parser. I'm reading unquoted lines  
> from a file. The file creater needs to use the form "foo\x20bar" without  
> the quotes in the file so my parser can read it as a single token.  
> Later, the string/token needs to be decoded with the \x20 converted to a  
> space.
>
> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"  
> is one.
>
> So, it's not really a problem of what happens when you assign a string  
> in the form "foo bar", rather how to convert the \x20 in a string to a  
> space. I think the \\ just complicates the entire issue.

Just thinking, if you was reading the string from a file, why were you  
worried about \\ and \ in the first place? (Ok, you moved to use / so this  
is moot now).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Mon Feb 23 21:02:04 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 00:02:04 -0200
Subject: Peculiar swap behavior
References: <480179.92204.qm@web83107.mail.mud.yahoo.com>
Message-ID: <op.upt2lqalx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 22:58:44 -0200, John Posner <jjposner at snet.net>  
escribi?:

>>>      m,n = [1,2,3],[4,5,6]
>>>      m[:],n[:] = n,m
>
> I believe this is an RTFM situation. In the Python 2.6.1 help topic  
> "Simple Statements" > "Assignment Statements", see this para:

Yes, the other relevant paragraph is:

"""An assignment statement evaluates the expression list (remember that  
this can be a single expression or a comma-separated list, the latter  
yielding a tuple) and assigns the single resulting object to each of the  
target lists, from left to right."""

Note that the RHS is evaluated COMPLETELY before assignment to the LHS  
begins. The assignment:

a, b = c, d

is NOT equivalent to:

a = c
b = d

except in simple cases.

-- 
Gabriel Genellina



From steve at holdenweb.com  Mon Feb 23 21:03:18 2009
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 23 Feb 2009 21:03:18 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
Message-ID: <gnvkh9$iqb$1@ger.gmane.org>

Michael Crute wrote:
> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files? I know this is subjective so I'm just looking for the general
> consensus. I've heard both sides of the story and I personally feel
> its okay if the code pertains to the whole module but have an open
> mind about the matter. If you object to code in __init__.py why, and
> what alternatives do you propose?
> 
No, it's absolutely fine. One common usage is to import symbols from
sub-modules so that they are available from a simple import of the package.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From greg.ewing at canterbury.ac.nz  Mon Feb 23 21:06:18 2009
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Tue, 24 Feb 2009 15:06:18 +1300
Subject: ANN: SuPy 1.6
Message-ID: <mailman.637.1235457234.11746.python-announce-list@python.org>

SuPy 1.6 Available
------------------

    http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/

Fixed some bugs in the Tool and Observer classes, and
in the linetool example.


What is SuPy?
-------------

SuPy is a plugin for the Sketchup 3D modelling application
that lets you script it in Python.

-- 
Greg Ewing
greg.ewing at canterbury.ac.nz


From bob at mellowood.ca  Mon Feb 23 21:18:28 2009
From: bob at mellowood.ca (bvdp)
Date: Mon, 23 Feb 2009 19:18:28 -0700
Subject: more on unescaping escapes
In-Reply-To: <mailman.623.1235440480.11746.python-list@python.org>
References: <gnv6jn$4nh$1@news.motzarella.org>	<mailman.583.1235428603.11746.python-list@python.org>	<gnvdb6$mf6$1@news.motzarella.org>	<mailman.604.1235434399.11746.python-list@python.org>	<gnvern$6a5$1@news.motzarella.org>	<mailman.614.1235436113.11746.python-list@python.org>	<gnvg1a$g7g$1@news.motzarella.org>	<mailman.618.1235438099.11746.python-list@python.org>	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org>
Message-ID: <gnvldk$827$1@news.motzarella.org>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <bob at mellowood.ca> escribi?:
>> Gabriel Genellina wrote:
>>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <bob at mellowood.ca> escribi?:
>>>> Chris Rebert wrote:
>>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <bob at mellowood.ca> wrote:
> 
>>>>> [problem with Python and Windows paths using backslashes]
>>>>>  Is there any particular reason you can't just internally use regular
>>>>> forward-slashes for the paths? [...]
>>>>
>>>> you are absolutely right! Just use '/' on both systems and be done 
>>>> with it. Of course I still need to use \x20 for spaces, but that is 
>>>> easy.
>>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in 
>>> URLs, that becomes a space only after decoding.
>>
>> I need to use the \x20 because of my parser. I'm reading unquoted 
>> lines from a file. The file creater needs to use the form "foo\x20bar" 
>> without the quotes in the file so my parser can read it as a single 
>> token. Later, the string/token needs to be decoded with the \x20 
>> converted to a space.
>>
>> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar" 
>> is one.
>>
>> So, it's not really a problem of what happens when you assign a string 
>> in the form "foo bar", rather how to convert the \x20 in a string to a 
>> space. I think the \\ just complicates the entire issue.
> 
> Just thinking, if you was reading the string from a file, why were you 
> worried about \\ and \ in the first place? (Ok, you moved to use / so 
> this is moot now).
> 

Just cruft introduced while I was trying to figure it all out. Having to 
figure the \\ and \x20 at same time with file and keyboard input just 
confused the entire issue :) Having the user set a line like 
c:\\Program\x20File ... works just fine. I'll suggest he use 
c:/program\x20files to make it bit simple for HIM, not my parser. 
Unfortunately, due to some bad design decisions on my part about 5 years 
ago I'm afraid I'm stuck with the \x20.

Thanks.



From mcrute at gmail.com  Mon Feb 23 21:21:57 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 21:21:57 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <gnvkh9$iqb$1@ger.gmane.org>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
Message-ID: <558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve at holdenweb.com> wrote:
> Michael Crute wrote:
>> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
>> files? I know this is subjective so I'm just looking for the general
>> consensus. I've heard both sides of the story and I personally feel
>> its okay if the code pertains to the whole module but have an open
>> mind about the matter. If you object to code in __init__.py why, and
>> what alternatives do you propose?
>>
> No, it's absolutely fine. One common usage is to import symbols from
> sub-modules so that they are available from a simple import of the package.

Yeah, I use it often for that I'm talking more about stuff like
utility functions, main methods, etc...

-mike

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From cs at zip.com.au  Mon Feb 23 21:30:11 2009
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 24 Feb 2009 13:30:11 +1100
Subject: ZSI / MTOM
In-Reply-To: <1fd305a1-d087-4902-83ba-780e97bd042f@m24g2000vbp.googlegroups.com>
Message-ID: <20090224023011.GA31951@cskk.homeip.net>

On 23Feb2009 08:09, John Ionides <john.ionides at gmail.com> wrote:
| I have project for which I would like to have a python web service
| including MTOM. It seems that ZSI is the most complete python web
| service library but that it doesn't currently support MTOM - and
| having worked through the code it looks as though it isn't going to be
| exactly simple. Is there anyone working on a patch (or interested in
| collaborating if it comes down to writing one)?

Maybe you should ask on the pywebsvcs mailing list, where ZSI discussion
takes place?

  http://pywebsvcs.sourceforge.net/

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Software engineering? That's like military intelligence, isn't it?
        - Doug Mohney <sysmgr at king.eng.umd.edu>


From benjamin at python.org  Mon Feb 23 21:41:33 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Tue, 24 Feb 2009 02:41:33 +0000 (UTC)
Subject: Code in =?utf-8?b?X19pbml0X18ucHks?= is it bad form?
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
	<558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>
Message-ID: <loom.20090224T024009-863@post.gmane.org>

Michael Crute <mcrute <at> gmail.com> writes:
> On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve <at> holdenweb.com> wrote:
> > No, it's absolutely fine. One common usage is to import symbols from
> > sub-modules so that they are available from a simple import of the package.
> 
> Yeah, I use it often for that I'm talking more about stuff like
> utility functions, main methods, etc...

There's no overarching Python doctrine forbidding you to do it. It has simply
become a matter of taste. Personally, I tend to put utility functions in their
own module (eg. util), but I do use __init__ for main methods and such.






From bignose+hates-spam at benfinney.id.au  Mon Feb 23 21:43:06 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Tue, 24 Feb 2009 13:43:06 +1100
Subject: Code in __init__.py, is it bad form?
References: <mailman.621.1235439725.11746.python-list@python.org>
Message-ID: <873ae4imh1.fsf@benfinney.id.au>

Michael Crute <mcrute at gmail.com> writes:

> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files?

No, it's good form, but *only* for code that truly pertains to the
entire package. Anything that can reasonably be in a module other than
?__init__?, should be.

That leaves the following things suitable for code in ?__init__?,
OTTOMH:

* Metadata attributes for the package (e.g. version string).

* Docstring for the package

* ?from foo import bar? to present attributes of the package that are
  actually implemented in a module, which should be just about
  everything in the package.

> If you object to code in __init__.py why

I object only to code that isn't clearly ?relates to the entire
package and can't reasonably be implemented in a separate module?.

If you're going to the effort of making a package (rather than just
coding the namespace as a single module), then the implementation
should be in modules other than ?__init__? to allow easier re-use,
re-factoring, and testing.

-- 
 \      ?When I wake up in the morning, I just can't get started until |
  `\     I've had that first, piping hot pot of coffee. Oh, I've tried |
_o__)                                    other enemas...? ?Emo Philips |
Ben Finney


From wuwei23 at gmail.com  Mon Feb 23 21:43:15 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 23 Feb 2009 18:43:15 -0800 (PST)
Subject: Code in __init__.py, is it bad form?
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com> 
	<gnvkh9$iqb$1@ger.gmane.org>
	<mailman.626.1235442122.11746.python-list@python.org>
Message-ID: <8988a1ae-4741-4484-aa96-b00386ca58b7@v38g2000yqb.googlegroups.com>

On Feb 24, 12:21?pm, Michael Crute <mcr... at gmail.com> wrote:
> Yeah, I use it often for that I'm talking more about stuff like
> utility functions, main methods, etc...

Personally, I use it only for those tasks related to 'initialising'
the package, a la the importing of various modules for convenience
sake (as mentioned by Steve).

I don't expect a class to define its method within its __init__, so
I'd find it unusual for a package to be defining any kind of
functionality within its __init__.py. I wouldn't _not_ use your code,
but I might eye it warily... :)


From mcrute at gmail.com  Mon Feb 23 21:48:36 2009
From: mcrute at gmail.com (Michael Crute)
Date: Mon, 23 Feb 2009 21:48:36 -0500
Subject: Code in __init__.py, is it bad form?
In-Reply-To: <loom.20090224T024009-863@post.gmane.org>
References: <558b73fb0902231741g437fc3bfid81844d6cb403daf@mail.gmail.com>
	<gnvkh9$iqb$1@ger.gmane.org>
	<558b73fb0902231821o48c87d51m49e66981106c0ae7@mail.gmail.com>
	<loom.20090224T024009-863@post.gmane.org>
Message-ID: <558b73fb0902231848w21810aaau45b950c99efd265b@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:41 PM, Benjamin Peterson <benjamin at python.org> wrote:
> Michael Crute <mcrute <at> gmail.com> writes:
>> On Mon, Feb 23, 2009 at 9:03 PM, Steve Holden <steve <at> holdenweb.com> wrote:
>> > No, it's absolutely fine. One common usage is to import symbols from
>> > sub-modules so that they are available from a simple import of the package.
>>
>> Yeah, I use it often for that I'm talking more about stuff like
>> utility functions, main methods, etc...
>
> There's no overarching Python doctrine forbidding you to do it. It has simply
> become a matter of taste. Personally, I tend to put utility functions in their
> own module (eg. util), but I do use __init__ for main methods and such.

Okay, so assuming I have decent judgment it sounds like I'm not doing
anything patently wrong. Thanks for the input.

-mike

-- 
________________________________
Michael E. Crute
http://mike.crute.org

God put me on this earth to accomplish a certain number of things.
Right now I am so far behind that I will never die. --Bill Watterson


From ccormie at aussiemail.com.au  Mon Feb 23 21:49:41 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 13:49:41 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.577.1235425832.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
Message-ID: <01b355ab$0$20654$c3e8da3@news.astraweb.com>

Mark Hammond wrote:
> On 23/02/2009 11:41 PM, Chris Cormie wrote:
>>
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
> 
> LOL sounds right!
> 
>> How do you get *Python* to tell you the dll and the problem symbol? Not
>> external tools, Python. Python at a low level is calling LoadLibrary and
>> GetProcAddress to resolve symbols and the call fails.
> 
> It is the LoadLibrary that is failing; it should be obvious that if it 
> was a simple GetProcAddress that was failing, Python would simply throw 
> an exception rather than displaying the ugly dialog box you see.

I'm talking about the whole class of errors when loading an extension, 
the LoadLibary succeeds but the GetProcAddress fails. Not one specific 
error, a class of errors and *by definition* from the original question 
LoadLibrary succeeds. That's the point: at some point in this common 
scenario we have the path to the dll and a symbol we are resolving, and 
the symbol name, yet for whatever reason the GetProcAddress lookup 
fails, resulting in a surprisingly uninformative errors message.

Regards,
Chris.


From pavlovevidence at gmail.com  Mon Feb 23 22:16:54 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 23 Feb 2009 19:16:54 -0800 (PST)
Subject: Code in __init__.py, is it bad form?
References: <mailman.621.1235439725.11746.python-list@python.org>
Message-ID: <4a716d3b-91f2-48cc-a42d-b923ffb50835@j1g2000yqi.googlegroups.com>

On Feb 23, 5:41?pm, Michael Crute <mcr... at gmail.com> wrote:
> Is it bad form (i.e. non-pythonic) to have code in your __init__.py
> files? I know this is subjective so I'm just looking for the general
> consensus. I've heard both sides of the story and I personally feel
> its okay if the code pertains to the whole module but have an open
> mind about the matter. If you object to code in __init__.py why, and
> what alternatives do you propose?


Well, I don't like when __init__ "helpfully" imports stuff I don't
need.  However, most single modules have lots of code I don't need,
too, and I never concern myself with them, so it's probably a
misplaced irk.

Go ahead and use it.


Carl Banks


From ccormie at aussiemail.com.au  Mon Feb 23 22:23:03 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:23:03 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.518.1235396997.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.518.1235396997.11746.python-list@python.org>
Message-ID: <01b35d7d$0$20654$c3e8da3@news.astraweb.com>

Gabriel Genellina wrote:
> En Mon, 23 Feb 2009 10:41:20 -0200, Chris Cormie 
> <ccormie at aussiemail.com.au> escribi?:
> 
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
>> Your technique works well and it does provide the information and it 
>> is a (roundabout) solution to this class of problems:  thank you very 
>> much. It doesn't answer the original question so I'll restate it:
>>
>> How do you get *Python* to tell you the dll and the problem symbol? 
>> Not external tools, Python. Python at a low level is calling 
>> LoadLibrary and GetProcAddress to resolve symbols and the call fails. 
>> At that point it has the name of the dll and the problem symbol to 
>> hand and yet strangely only gives an opaque error message. How does 
>> one get Python to print out the faulty DLL and symbol?
> 
> You can't, because it isn't Python who's trying to load the symbol - the 
> *only* symbol that Python attempts to import itself is "initFOO" from 
> FOO.pyd, and when that fails you get an explicit message.
> The error you see must come from the extension itself, and propagates 
> into Python as an ImportError.

Right -- now we are getting somewhere! That makes a lot of sense.

What I was expecting to see next was an explicit GetProcAddress() call 
in the extension code that was failing in initFOO() or elsewhere in the 
extension code. But there are no such calls.

I think what might have been making this confusing is that the root of 
my example problem is link time.

Let me explain by giving the specific example case I have to hand.
I orginally got on to this class of opaque runtime errors caused by 
missing symbols through building the pycURL extension on MinGW. As of 
Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW 
maintains a set of .a files for system DLLs including the C Runtime. 
When building pycURL naturally I want to link against libmsvcr90.a so 
Python 2.6 and pycURL are using the same C Rutime. Problem was, MinGW's 
  .a was wrong: it exports symbols that msvcr90.dll does not in fact 
possess. Building pycURL with the faulty libmsvcr90.a causes the opaque 
error message: "ImportError: DLL load failed"

Now I expected this meant an explict LoadLibrary() GetProcAddress() 
sequence was failing in the extension but perhaps that's not what 
happens at all?
Chris






From ccormie at aussiemail.com.au  Mon Feb 23 22:25:40 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:25:40 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<5daf9b18-eb79-450b-803e-c6bd4f73e145@r41g2000yqm.googlegroups.com>
Message-ID: <01b35e19$0$20654$c3e8da3@news.astraweb.com>

John Machin wrote:
> On Feb 23, 11:41 pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>> LOL, I am that person :p
> 
> It wasn't apparent, and still isn't.

Yikes, enough with the rudeness people. I'm asking a reasonable question 
in a good faith.


From venutaurus539 at gmail.com  Mon Feb 23 22:29:07 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 19:29:07 -0800 (PST)
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
Message-ID: <1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>

On Feb 23, 11:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Mon, Feb 23, 2009 at 5:51 AM, venutaurus... at gmail.com
>
> <venutaurus... at gmail.com> wrote:
> > Hi all,
> > ? ? ? ? ?I am trying to find the attributes of afile whose name has
> > non english characters one like given below. When I try to run my
> > python scirpt, it fails giving out an error filename must be in string
> > or UNICODE. When i try to copy the name of the file as a strinig, it
> > (KOMODO IDE) is not allowing me to save the script saying that it
> > cannot convert some of the characters in the current encoding which is
> > Western European(CP-1252).
>
> > 0010testUnicode_???????????????????? !#$%&'()+,-.
> > 0123456789;=... at ABCD.txt.txt
>
> (1) How are you entering or retrieving that filename?
> (2) Please provide the exact error and Traceback you're getting.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

Hello,
        First of all thanks for your response. I've written a function
as shown below to recurse a directory and return a file based on the
value of n. I am calling this fucntion from my main code to catch that
filename. The folder which it recurses through contains a folder
having files with unicode names (as an example i've given earlier.
-----------------------------------------------------------------------------
def findFile(dir_path):
    for name in os.listdir(dir_path):
        full_path = os.path.join(dir_path, name)
        print full_path
        if os.path.isdir(full_path):
            findFile(full_path)
        else:
            n = n - 1
            if(n ==0):
                return full_path
--------------------------------------------------------------------------------------------------
                    The problem is in the return statement. In the
function when I tried to print the file name, it is printing properly
but the receiving variable is not getting populated with the file
name. The below code (1st statement) shows the value of the full_path
variable while the control is at the return statement. The second
statement is in the main code from where the function call has been
made.
Once the control has reached the main procedure after executing the
findFile procedure, the third statement gives the status of file
variable which has type as NoneType and value as None. Now when I try
to check if the path exists, it fails giving the below trace back.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder
\0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
file = findFile(fpath)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
file
NoneType
None

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
This is the final trace back:

Traceback (most recent call last):
  File "C:\RecallStubFopen.py", line 268, in <module>
    if os.path.exists(file):
  File "C:\Python26\lib\genericpath.py", line 18, in exists
    st = os.stat(path)
TypeError: coercing to Unicode: need string or buffer, NoneType found

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Please ask if you need any further information.


Thank you,
Venu



From johnforse at talktalk.net  Mon Feb 23 22:31:56 2009
From: johnforse at talktalk.net (John Forse)
Date: Tue, 24 Feb 2009 03:31:56 +0000
Subject: getting tut. example to work
Message-ID: <45818CC4-B629-4995-9C52-150297BBE7E5@talktalk.net>

I'm trying some examples from the language ref sections on the site in  
the process of learning some python in 3.0.1. I've tried to run both  
of the samples below ,but the only printout is "generator object chain  
at 0x11f4dc8" whether I use print() or not . How do I use the sample  
to produce the expected printout a b c d e f.
  Thanks
John F
A
def chain(*iterables):
     for it in iterables:
         for element in it:
             print(element)
             yield element

def main():
     chain('abc','def')

main()
B
alternative
import itertools
itertools.chain('abc','def')





From ccormie at aussiemail.com.au  Mon Feb 23 22:54:15 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 14:54:15 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <mailman.577.1235425832.11746.python-list@python.org>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
Message-ID: <01b364cd$0$5185$c3e8da3@news.astraweb.com>

Mark Hammond wrote:
> On 23/02/2009 11:41 PM, Chris Cormie wrote:
>>
>>> If that not-very-technical description [all I've ever needed] doesn't
>>> help, you'll need to read the DW help file (HTFF1K) or wait till
>>> someone who knows what they are doing comes along :-)
>>
>> LOL, I am that person :p
> 
> LOL sounds right!
> 
>> How do you get *Python* to tell you the dll and the problem symbol? Not
>> external tools, Python. Python at a low level is calling LoadLibrary and
>> GetProcAddress to resolve symbols and the call fails.
> 
> It is the LoadLibrary that is failing; it should be obvious that if it 
> was a simple GetProcAddress that was failing, Python would simply throw 
> an exception rather than displaying the ugly dialog box you see.
> 
> The problem is that some *other* DLL in the chain of dependencies is 
> failing to load; please re-adjust your perceptions of your own knowledge 
> and re-read John's initial response - if you follow his instructions 
> that should all become quite obvious.
> 
> Mark

I think an example would help rather than me jabbering on about 
LoadLibary/GetProcAddress .

It really is a case of Python loads module x depending on DLL y that is 
missing symbol z, yet the error message is just "load x failed" when in 
theory it could be "load x failed: y doesn't have z".

However I think I am confusing people (and myself!) by assuming it's 
always as explicit as a LoadLibary/GetProcAddress sequence that is 
failing when people see this error.

Let me explain by giving the specific example case I have to hand.
I originally got on to this class of opaque runtime errors caused by 
missing symbols through building the pycURL extension on MinGW. As of 
Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW 
maintains a set of .a files for system DLLs including the C Runtime. 
When building pycURL naturally I want to link against libmsvcr90.a so 
Python 2.6 and pycURL are using the same C Runtime. Problem was, MinGW's 
  .a was wrong: it exports symbols that msvcr90.dll does not in fact 
possess. Building pycURL with the faulty libmsvcr90.a causes the opaque 
error message: "ImportError: DLL load failed"

I think Gabriel's got the part of the answer: she said  "it isn't Python 
who's trying to load the symbol - the *only* symbol that Python attempts 
to import itself is "initFOO" from FOO.pyd"

So my next question is: given the above missing-symbol problem, is the 
system able/willing to report the bad symbol reference in the .pyd when 
Python attempts to import initFOO?

Regards,
Chris.



From wuwei23 at gmail.com  Mon Feb 23 23:07:53 2009
From: wuwei23 at gmail.com (alex23)
Date: Mon, 23 Feb 2009 20:07:53 -0800 (PST)
Subject: getting tut. example to work
References: <mailman.630.1235446326.11746.python-list@python.org>
Message-ID: <afd1c675-4e75-43cd-865b-f5457ab91eb2@j38g2000yqa.googlegroups.com>

On Feb 24, 1:31?pm, John Forse <johnfo... at talktalk.net> wrote:
> I'm trying some examples from the language ref sections on the site in ?
> the process of learning some python in 3.0.1. I've tried to run both ?
> of the samples below ,but the only printout is "generator object chain ?
> at 0x11f4dc8" whether I use print() or not .

Yes, because you're creating a generator object but you're not
actually doing anything with it.

> How do I use the sample ?
> to produce the expected printout a b c d e f.

Since you have a print inside 'chain', you should be able to get that
output by doing the following:

    list(chain('abc','def'))

Although I'd recommend removing the print from 'chain' and doing this
instead:

    for elem in chain('abc','def'):
        print elem


From venutaurus539 at gmail.com  Mon Feb 23 23:20:30 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Mon, 23 Feb 2009 20:20:30 -0800 (PST)
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
	<1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>
Message-ID: <0a4fa610-ac99-41e1-9fab-06b461c71a4a@r34g2000vbp.googlegroups.com>

On Feb 24, 8:29?am, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 23, 11:02?pm, Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Mon, Feb 23, 2009 at 5:51 AM, venutaurus... at gmail.com
>
> > <venutaurus... at gmail.com> wrote:
> > > Hi all,
> > > ? ? ? ? ?I am trying to find the attributes of afile whose name has
> > > non english characters one like given below. When I try to run my
> > > python scirpt, it fails giving out an error filename must be in string
> > > or UNICODE. When i try to copy the name of the file as a strinig, it
> > > (KOMODO IDE) is not allowing me to save the script saying that it
> > > cannot convert some of the characters in the current encoding which is
> > > Western European(CP-1252).
>
> > > 0010testUnicode_???????????????????? !#$%&'()+,-.
> > > 0123456789;=... at ABCD.txt.txt
>
> > (1) How are you entering or retrieving that filename?
> > (2) Please provide the exact error and Traceback you're getting.
>
> > Cheers,
> > Chris
>
> > --
> > Follow the path of the Iguana...http://rebertia.com
>
> Hello,
> ? ? ? ? First of all thanks for your response. I've written a function
> as shown below to recurse a directory and return a file based on the
> value of n. I am calling this fucntion from my main code to catch that
> filename. The folder which it recurses through contains a folder
> having files with unicode names (as an example i've given earlier.
> --------------------------------------------------------------------------- --
> def findFile(dir_path):
> ? ? for name in os.listdir(dir_path):
> ? ? ? ? full_path = os.path.join(dir_path, name)
> ? ? ? ? print full_path
> ? ? ? ? if os.path.isdir(full_path):
> ? ? ? ? ? ? findFile(full_path)
> ? ? ? ? else:
> ? ? ? ? ? ? n = n - 1
> ? ? ? ? ? ? if(n ==0):
> ? ? ? ? ? ? ? ? return full_path
> --------------------------------------------------------------------------- -----------------------
> ? ? ? ? ? ? ? ? ? ? The problem is in the return statement. In the
> function when I tried to print the file name, it is printing properly
> but the receiving variable is not getting populated with the file
> name. The below code (1st statement) shows the value of the full_path
> variable while the control is at the return statement. The second
> statement is in the main code from where the function call has been
> made.
> Once the control has reached the main procedure after executing the
> findFile procedure, the third statement gives the status of file
> variable which has type as NoneType and value as None. Now when I try
> to check if the path exists, it fails giving the below trace back.
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ----------------------------
> E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder
> \0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ------------------
> file = findFile(fpath)
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- -----------------------------------------
> file
> NoneType
> None
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- -----------------------------------------
> This is the final trace back:
>
> Traceback (most recent call last):
> ? File "C:\RecallStubFopen.py", line 268, in <module>
> ? ? if os.path.exists(file):
> ? File "C:\Python26\lib\genericpath.py", line 18, in exists
> ? ? st = os.stat(path)
> TypeError: coercing to Unicode: need string or buffer, NoneType found
>
> --------------------------------------------------------------------------- --------------------------------------------------------------------------- ---------------------------------------------
>
> Please ask if you need any further information.
>
> Thank you,
> Venu

To add to what I've said above...I tried manual conversion of the file
using unicode() function which is throwing this error:
Traceback (most recent call last):
  File "C:\RecallStubFopen.py", line 278, in <module>
    file = unicode(file)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xeb in position
74: ordinal not in range(128)








From nagle at animats.com  Mon Feb 23 23:21:59 2009
From: nagle at animats.com (John Nagle)
Date: Mon, 23 Feb 2009 20:21:59 -0800
Subject: "Byte" type?
In-Reply-To: <49A19B92.2080102@v.loewis.de>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
Message-ID: <49a36e1c$0$1586$742ec2ed@news.sonic.net>

Martin v. L?wis wrote:
>>> Please don't call something dumb that you don't fully understand. It's
>>> offenses the people who have spent lots of time developing Python --
>>> personal, unpaid and voluntary time!

    Some of the people involved are on Google's payroll.

>> Crying out;  "Please do not criticise me, I am doing it for free!" does
>> not justify delivering sub standard work - that is the nature of the
>> open source process - if you lift your head and say or do something,
>> there are bound to be some objections - some thoughtful and valid,
>> and others merely carping.  Being sensitive about it serves no purpose.
> 
> Still, John *clearly* doesn't understand what he observes, so asking him
> not to draw conclusions until he does understand is not defending
> against criticism.
> 
>> This is not a helpful response - on the surface JN has a point - If
>> you have to go through two conversions, then 2.6 does not achieve
>> what it appears to set out to do.  So the issue is simple:
>>
>> - do you have to convert twice?
> 
> Depends on how you write your code. If you use the bytearray type
> (which John didn't, despite his apparent believe that he did),
> then no conversion additional conversion is needed.

     According to PEP 3137, there should be no distinction between
the two for read purposes.  In 2.6, there is.  That's a bug.

> Likewise, if you only use byte (not bytearray) literals, without
> accessing individual bytes (e.g. if you only ever read and write
> them, or pass them to the struct module), 2to3 will do the right
> thing.
> 
>> - If yes - why? - as he says - there exists no prior code,
>>   so there seems to be no reason not to make it identical
>>   to 3.0
> 
> Sure there is. Making the bytes type and the str type identical
> in 2.x gives the easiest way of porting. Adding bytes as a separate
> type would have complicated a lot of things.
> 
> Regards,
> Martin

    No, it's broken.  PEP 3137 says one thing, and the 2.6 implementation
does something else.  So code written for 2.6 won't be ready for 3.0.
This defeats the supposed point of 2.6.

					John Nagle


From M8R-yfto6h at mailinator.com  Mon Feb 23 23:27:33 2009
From: M8R-yfto6h at mailinator.com (Mark Tolonen)
Date: Mon, 23 Feb 2009 20:27:33 -0800
Subject: getting at individual bits inside byte field: struct module :
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
Message-ID: <gnvsut$gc5$1@aioe.org>


"harijay" <harijay at gmail.com> wrote in message 
news:4c7d58a1-830f-4f02-ba07-aa4910f5f4e9 at b16g2000yqb.googlegroups.com...
> In my last post I had asked about reading data from a binary file
> using the struct module.
> Thanks to some excellent help , I have managed to read in
> successfully
> most of the header of this binary format that I want to parse.  These
> are some time-voltage traces from a digital
> to analog converter for my experiments. The output is according to a
> format
> mentioned here : ( http://www.dataq.com/support/techinfo/ff.htm)
>
> I have a question about how to bitmask a bunch of bytes read in from
> such a binary formatted file .
>
> For eg the spec says the first two bytes have different parameters in
> different bits .
> Byte 1                                                  Byte 0
> SN16 SD9        SD8     SD7     SD6     SD5     SD4     SD3
> SD2     SD1     SD0     T4      T3      T2      T1      T0
>
> I am reading in the two bytes using the following code
>
> import struct
> f.seek(0)
> element1_format = struct.Struct("<H")
> (element1,) = element1_format.unpack(f.read(2))
>
> Now element1 has type "str" . How do I apply a bitmask to this to get
> at information in the component bits .
> Since the entire file format has many such bitmasked fields and since
> this is my first venture into binary formats and c-type structs , I
> wanted to know how to read values inside a byte using python.
> My few tries at using bitwise operators ( element1 & 0x001f) are
> frustrated by messages that say " unsupported operand type(s) for &:
> 'str' and 'int' " .
> How can I keep my string objects as bits and apply bitmasks to them
> Any help in this will be greatly appreciated.
> Thanks
> hari

Please post a small example that fails as you describe.  From your example, 
element1 should be an int (unpacked from two bytes), and there is no f 
defined.  Without the actual code we can't figure out what you are doing 
wrong.

This works as expected:

>>> import struct
>>> format = struct.Struct("<H")
>>> (element1,) = format.unpack('aa') # a two-byte string to unpack
>>> print hex(element1)
0x6161
>>> print element1 & 0x1f
1

-Mark



From comptekki at gmail.com  Mon Feb 23 23:35:38 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:35:38 -0700
Subject: how to conditionally add a dict in-line
Message-ID: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>

I have this line:

navs.append(A(' '+str(i+1)+'
',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query
or ''})))

How do I do something like this:

vars={'_page':i, if request.vars._query not None then insert this
key/value pair ('_query':request.vars._query) else insert nothing }

thx,

-wj


From comptekki at gmail.com  Mon Feb 23 23:44:37 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:44:37 -0700
Subject: how to conditionally add a dict in-line
In-Reply-To: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>
References: <533df7fa0902232035v261fdb2ck43992404b5a5a2c@mail.gmail.com>
Message-ID: <533df7fa0902232044o6babfc8fh415f0815f531351a@mail.gmail.com>

On Mon, Feb 23, 2009 at 9:35 PM, Wes James <comptekki at gmail.com> wrote:
> I have this line:
>
> navs.append(A(' '+str(i+1)+'
> ',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query
> or ''})))
>
> How do I do something like this:
>
> vars={'_page':i, if request.vars._query not None then insert this
> key/value pair ('_query':request.vars._query) else insert nothing }


Nevermind, this seems to work:

                navs.append(A(' '+str(i+1)+'
',_href=self.action(args=request.args,vars={'_page':i,'_query':request.vars._query}
if request.vars._query else {'_page':i})))

-wj


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:47:23 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:47:23 GMT
Subject: how to conditionally add a dict in-line
References: <mailman.631.1235450141.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:35:38 -0700, Wes James wrote:

> I have this line:
> 
> navs.append(A(' '+str(i+1)+'
> ',_href=self.action(args=request.args,vars=
{'_page':i,'_query':request.vars._query
> or ''})))

What a mess. How can you read it?


> How do I do something like this:
> 
> vars={'_page':i, if request.vars._query not None then insert this
> key/value pair ('_query':request.vars._query) else insert nothing }

vars = {'_page': i}
if request.vars._query is not None:
    vars['_query'] = request.vars._query


See how simple and clear things are when you give up the insistence on 
making everything a one-liner?

But if you *insist* on a one-liner (perhaps because your keyboard has a 
broken Enter key):

vars = {'_page': i} if request.vars._query is None else  {'_page': i, '_query': request.vars._query}




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:47:59 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:47:59 GMT
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:

> Steven D'Aprano wrote:
>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>
>>> as far as i understand things, the best model is:
>>>
>>> 1 - everything is an object
>>> 2 - everything is passed by reference
>>
>> Except that is wrong. If it were true, you could do this:
> [pointer swapping]
> 
> i was thinking of how the stack is used; i would have called what you
> are talking about "pointer semantics".  however, on reading around a
> little, it seems that i'm in a very small minority (which is a pity,
> because if you restrict the meaning to how values are handled on the
> stack then you get a lot closer to having just values and references,
> rather than the whole pile of different terms that are apparently in
> use).
> 
> sorry for the confusion,

Why is it a pity to have a whole pile of different terms to describe a 
whole lot of different behaviours? I would suggest the real confusion 
would be if we had two terms to describe a dozen different parameter-
passing conventions.




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Feb 23 23:50:18 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 04:50:18 GMT
Subject: Access from class variable to one on constructor
References: <1c006a1c-83e1-47fa-bf54-f458e98b484c@h5g2000yqh.googlegroups.com>
	<mailman.509.1235383504.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.04.50.19@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 08:02:17 -0200, Gabriel Genellina wrote:

> En Mon, 23 Feb 2009 07:40:47 -0200, Kless <jonas.esp at googlemail.com>
> escribi?:
> 
>> How to access from a class variable to one that is initialized on the
>> constructor?
>> --------------
>> class Foo():
>>   foo = bar  # I want to access *from here* to variables created on
>> the constructor.
>>
>>   def __init__(self, bar_init):
>>     self.bar = bar_init
>> --------------
> 
> Unless I misunderstand you, you can't do that. Class variables are
> shared by all instances and don't depend on a particular instance - they
> exist even *before* any instance is created.


Please don't use the term "class variables" to mean class *attributes*, 
it makes my brain hurt. If a string variable is a string, and an int 
variable is an int, and a bool variable is a bool, a class variable 
should be a class.

What you can do is shift the creation of the class attribute to the 
constructor, instead of when the class is created:

class Spam():
    def __init__(self, bar_init):
        self.__class__.foo = bar_init



But I'm not sure why you would want to.



-- 
Steven


From peter at www.pjb.com.au  Mon Feb 23 23:56:12 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 24 Feb 2009 04:56:12 GMT
Subject: tkinter icons as bytestrings, not files?
Message-ID: <slrngq6vfd.2u7.peter@box8.pjb.com.au>

Greetings,

As a newbie, starting with Python3, I'm working my way through Mark
Summerfield's tkinter examples.  In the toolbar, there's lines like:
    for image, command in (
        ('images/filenew.gif',  self.fileNew),
        ('images/fileopen.gif', self.fileOpen),
        ('images/filesave.gif', self.fileSave),
        ('images/editadd.gif',  self.editAdd),
        ('images/editedit.gif', self.editEdit),
        ('images/editdelete.gif', self.editDelete),):
    image = os.path.join(os.path.dirname(__file__), image)
    image = tkinter.PhotoImage(file=image)
    self.toolbar_images.append(image)
    button = tkinter.Button(toolbar, image=image, command=command)
    button.grid(row=0, column=len(self.toolbar_images) -1)

which are always failing because the icons are in the wrong place
and I can't help but wonder if I can put all these little images
in the application itself, either as b'whatever' or uuencoded or
in svg etc, and then invoke some suitable variation of the
    image = tkinter.PhotoImage(file=image)
or of the
    button = tkinter.Button(toolbar, image=image, command=command)
command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
magic key (unless it's "data=something, format=something")) ...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From comptekki at gmail.com  Mon Feb 23 23:56:46 2009
From: comptekki at gmail.com (Wes James)
Date: Mon, 23 Feb 2009 21:56:46 -0700
Subject: how to conditionally add a dict in-line
In-Reply-To: <pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
References: <mailman.631.1235450141.11746.python-list@python.org>
	<pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
Message-ID: <533df7fa0902232056q6d65eeacg1536c586c66e1732@mail.gmail.com>

Steven. Thx

(see my question below...)

On Mon, Feb 23, 2009 at 9:47 PM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
> On Mon, 23 Feb 2009 21:35:38 -0700, Wes James wrote:
>
>> I have this line:
>>
>> navs.append(A(' '+str(i+1)+'
>> ',_href=self.action(args=request.args,vars=
> {'_page':i,'_query':request.vars._query
>> or ''})))
>
> What a mess. How can you read it?
>
>
>> How do I do something like this:
>>
>> vars={'_page':i, if request.vars._query not None then insert this
>> key/value pair ('_query':request.vars._query) else insert nothing }
>
> vars = {'_page': i}
> if request.vars._query is not None:
> ? ?vars['_query'] = request.vars._query

Could this be:

vars = {'_page': i}
 if request.vars._query:
    vars['_query'] = request.vars._query



>
> See how simple and clear things are when you give up the insistence on
> making everything a one-liner?

<snip>

-wj


From sjmachin at lexicon.net  Tue Feb 24 00:01:28 2009
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 23 Feb 2009 21:01:28 -0800 (PST)
Subject: How does one get from "ImportError: DLL load failed:..." to a 
	culprit .dll and symbol?
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org> 
	<01b364cd$0$5185$c3e8da3@news.astraweb.com>
Message-ID: <68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>

On Feb 24, 2:54?pm, Chris Cormie <ccor... at aussiemail.com.au> wrote:
> Mark Hammond wrote:
> > On 23/02/2009 11:41 PM, Chris Cormie wrote:
>
> >>> If that not-very-technical description [all I've ever needed] doesn't
> >>> help, you'll need to read the DW help file (HTFF1K) or wait till
> >>> someone who knows what they are doing comes along :-)
>
> >> LOL, I am that person :p
>
> > LOL sounds right!
>
> >> How do you get *Python* to tell you the dll and the problem symbol? Not
> >> external tools, Python. Python at a low level is calling LoadLibrary and
> >> GetProcAddress to resolve symbols and the call fails.
>
> > It is the LoadLibrary that is failing; it should be obvious that if it
> > was a simple GetProcAddress that was failing, Python would simply throw
> > an exception rather than displaying the ugly dialog box you see.
>
> > The problem is that some *other* DLL in the chain of dependencies is
> > failing to load; please re-adjust your perceptions of your own knowledge
> > and re-read John's initial response - if you follow his instructions
> > that should all become quite obvious.
>
> > Mark
>
> I think an example would help rather than me jabbering on about
> LoadLibary/GetProcAddress .
>
> It really is a case of Python loads module x depending on DLL y that is
> missing symbol z, yet the error message is just "load x failed" when in
> theory it could be "load x failed: y doesn't have z".
>
> However I think I am confusing people (and myself!) by assuming it's

Don't assume; read the [open] source code; see below.

> always as explicit as a LoadLibary/GetProcAddress sequence that is
> failing when people see this error.
>
> Let me explain by giving the specific example case I have to hand.
> I originally got on to this class of opaque runtime errors caused by
> missing symbols through building the pycURL extension on MinGW. As of
> Python 2.6, Python links against the new msvcr90.dll C Runtime. MinGW
> maintains a set of .a files for system DLLs including the C Runtime.
> When building pycURL naturally I want to link against libmsvcr90.a so
> Python 2.6 and pycURL are using the same C Runtime. Problem was, MinGW's
> ? .a was wrong: it exports symbols that msvcr90.dll does not in fact
> possess. Building pycURL with the faulty libmsvcr90.a causes the opaque
> error message: "ImportError: DLL load failed"
>
> I think Gabriel's got the part of the answer: she said ?"it isn't Python
> who's trying to load the symbol - the *only* symbol that Python attempts
> to import itself is "initFOO" from FOO.pyd"
>
> So my next question is: given the above missing-symbol problem, is the
> system able/willing to report the bad symbol reference in the .pyd when
> Python attempts to import initFOO?

My reading of the Python 2.6.1 version of dynload_win.c tells me that:

1. It uses LoadLibraryEx() to attempt to load the pyd given its full
pathname

2. If that fails, it gets the Windows error code using GetLastError()

3. It gets the Windows message text using FormatMessage()

4. It assembles the message as "DLL load failed: " plus the Windows
message text (less any trailing "\r\n").

Note that if the pyd load succeeds, it rummages in memory to find the
pythonxx.dll used by the pyd so that it can be checked for
consistency. Then and only then it uses GetProcAddress() to get the
address of the initFOO function.

Do you know a way of getting more info out of Windows than GetLastError
()?


From alwaseem307ster at yahoo.com  Tue Feb 24 00:04:21 2009
From: alwaseem307ster at yahoo.com (klia)
Date: Mon, 23 Feb 2009 21:04:21 -0800 (PST)
Subject: pysqlite smart search
In-Reply-To: <22157116.post@talk.nabble.com>
References: <22157116.post@talk.nabble.com>
Message-ID: <22175924.post@talk.nabble.com>




klia wrote:
> 
>  Hey guys;
> 
> I am trying to develop a tiny program using python to search inside sqlite
> database with file extension is .db in which the program will ask users to
> enter their search query and base on that it will retrieve the results But
> 
> I need the program to have some smartness in search mechanism in which the
> program will guess that the user is looking for these key words in the
> database.
> 
> so far i came up with this but the search ain't smart, i have to write the
> full key word in order to retrieve specific information.
> 
> from pysqlite2 import dbapi2 as sqlite3
> 
> connection = sqlite3.connect('Photos.db')
> memoryConnection = sqlite3.connect(':memory:')
> cursor = connection.cursor()
> prompt = 'Enter your search query?\n'
> keyword = raw_input(prompt)
> if cursor.execute('SELECT * FROM photos WHERE Tag LIKE ?',[keyword]):
> print cursor.fetchall()
> else:
> cursor.execute('SELECT * FROM photos WHERE Date LIKE ?', [keyword])
> print cursor.fetchall()
> 
> Any ideas and
> thanks in advance
> Reply
> 

Thank you guys, it worked perfectly
Solved
-- 
View this message in context: http://www.nabble.com/pysqlite-smart-search-tp22157116p22175924.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From aquil.abdullah at gmail.com  Tue Feb 24 00:13:12 2009
From: aquil.abdullah at gmail.com (aha)
Date: Mon, 23 Feb 2009 21:13:12 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com> 
	<mailman.587.1235430309.11746.python-list@python.org>
Message-ID: <794a35cc-f530-43e7-97c5-87694f27b573@x9g2000yqk.googlegroups.com>

Hello All,
  It occurred to me that I might just want to try copying the
subprocess.py installed in a /usr/lib/python24 installation to the
directory where I place the scripts that I need to launch my
application...I know this was mentioned earlier.  Anyway, my
application worked under python 2.3 and later python versions as
well.  Here is what I did:

I renamed subprocess.py to subprocess23.py and then used the following
code:

try:
  import subprocess
except ImportError:
  import subprocess23 as subprocess

I chose this route because I took a deeper look at the code in the
subprocess module and I also realized that I would not be able to use
the popen2, because I would not be able to do things like os.setpgrp
for preexec_fn, with popen2.  In the end, if I wanted that type of
functionality I would have to use os.dup, fork, exec, which meant
reinventing the wheel.  I overcame the issue of dealing with msvcrt
and _subprocess under windows by requiring python24 or greater under
windows.

Regards,
Aquil


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 24 00:33:37 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 05:33:37 GMT
Subject: how to conditionally add a dict in-line
References: <mailman.631.1235450141.11746.python-list@python.org>
	<pan.2009.02.24.04.47.22@REMOVE.THIS.cybersource.com.au>
	<mailman.633.1235451410.11746.python-list@python.org>
Message-ID: <pan.2009.02.24.05.33.37@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:56:46 -0700, Wes James wrote:

>> vars = {'_page': i}
>> if request.vars._query is not None:
>> ? ?vars['_query'] = request.vars._query
> 
> Could this be:
> 
> vars = {'_page': i}
>  if request.vars._query:
>     vars['_query'] = request.vars._query


Instead of typing "request.vars._query" in all the examples, I'm going to 
abbreviate it as "x" instead.

"if x is not None" and "if x" are very different things. Consider the 
following examples:


>>> x = None
>>>
>>> if x is not None:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing
>>>
>>> if x:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing


So far so good. Both pieces of code do the right thing when x actually is 
None. But what happens if x is *not* None?


>>> x = ""  # The empty string is *not* None.
>>>
>>> if x is not None:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
action performed when x is not None
>>>
>>> if x:
...     print "action performed when x is not None"
... else:
...     print "do nothing"
...
do nothing



That's clearly wrong, because we know that x isn't None, it is the empty 
string. The test "if x" does not test for the same thing as "if x is not 
None". "if x" tests the general truth value of any object, and many 
objects have a false truth value: None, empty string, 0, [], {} and many 
more.




-- 
Steven


From chaosmage at gmail.com  Tue Feb 24 00:35:21 2009
From: chaosmage at gmail.com (collin)
Date: Mon, 23 Feb 2009 21:35:21 -0800 (PST)
Subject: How do I count the distance between strings in a list?
Message-ID: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>

For example, if I were to have the code

randomlist = ["1", "2", "3", "4"]

And I want to count the distance between strings "1" and "4" which is
3, what command can I use to do this?


From harijay at gmail.com  Tue Feb 24 00:42:26 2009
From: harijay at gmail.com (harijay)
Date: Mon, 23 Feb 2009 21:42:26 -0800 (PST)
Subject: getting at individual bits inside byte field: struct module : 
	bitwise operator
References: <4c7d58a1-830f-4f02-ba07-aa4910f5f4e9@b16g2000yqb.googlegroups.com>
	<gnvsut$gc5$1@aioe.org>
Message-ID: <f2060df4-de99-435e-bbf7-a42988b9d622@z1g2000yqn.googlegroups.com>

Thanks Gabriel , MRAB and Mark

Instead of using the bitwise operator on the unpacked data I was
trying to do a bitwise operator directly after read. This was giving
the unsupported operand error

i.e

# version in my code - wrong
file.read(2) & 0x001f

Instead of

# version in my example and now in my working code
(element1,) = struct.unpack("<H",file.read(2) )
Tonethrufour = element1 & 0x1F

I only realized it after I read your replies and went back to my
actual  code which had the mistake .
Thanks a lot again.

Hari



Thanks for your help and hope I dont commit any more such stupid
mistakes

On Feb 23, 11:27?pm, "Mark Tolonen" <M8R-yft... at mailinator.com> wrote:
> "harijay" <hari... at gmail.com> wrote in message
>
> news:4c7d58a1-830f-4f02-ba07-aa4910f5f4e9 at b16g2000yqb.googlegroups.com...
>
>
>
> > In my last post I had asked about reading data from a binary file
> > using the struct module.
> > Thanks to some excellent help , I have managed to read in
> > successfully
> > most of the header of this binary format that I want to parse. ?These
> > are some time-voltage traces from a digital
> > to analog converter for my experiments. The output is according to a
> > format
> > mentioned here : (http://www.dataq.com/support/techinfo/ff.htm)
>
> > I have a question about how to bitmask a bunch of bytes read in from
> > such a binary formatted file .
>
> > For eg the spec says the first two bytes have different parameters in
> > different bits .
> > Byte 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Byte 0
> > SN16 SD9 ? ? ? ?SD8 ? ? SD7 ? ? SD6 ? ? SD5 ? ? SD4 ? ? SD3
> > SD2 ? ? SD1 ? ? SD0 ? ? T4 ? ? ?T3 ? ? ?T2 ? ? ?T1 ? ? ?T0
>
> > I am reading in the two bytes using the following code
>
> > import struct
> > f.seek(0)
> > element1_format = struct.Struct("<H")
> > (element1,) = element1_format.unpack(f.read(2))
>
> > Now element1 has type "str" . How do I apply a bitmask to this to get
> > at information in the component bits .
> > Since the entire file format has many such bitmasked fields and since
> > this is my first venture into binary formats and c-type structs , I
> > wanted to know how to read values inside a byte using python.
> > My few tries at using bitwise operators ( element1 & 0x001f) are
> > frustrated by messages that say " unsupported operand type(s) for &:
> > 'str' and 'int' " .
> > How can I keep my string objects as bits and apply bitmasks to them
> > Any help in this will be greatly appreciated.
> > Thanks
> > hari
>
> Please post a small example that fails as you describe. ?From your example,
> element1 should be an int (unpacked from two bytes), and there is no f
> defined. ?Without the actual code we can't figure out what you are doing
> wrong.
>
> This works as expected:
>
> >>> import struct
> >>> format = struct.Struct("<H")
> >>> (element1,) = format.unpack('aa') # a two-byte string to unpack
> >>> print hex(element1)
> 0x6161
> >>> print element1 & 0x1f
>
> 1
>
> -Mark



From sambit2005 at gmail.com  Tue Feb 24 00:45:54 2009
From: sambit2005 at gmail.com (Sambit Samal)
Date: Tue, 24 Feb 2009 18:45:54 +1300
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <9e680b420902232145k35b3af51tcc085484377bc88f@mail.gmail.com>

test

On Sat, Feb 21, 2009 at 3:31 AM, Trip Technician <luke.dunn at gmail.com>wrote:

> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jgardner at jonathangardner.net  Tue Feb 24 01:08:28 2009
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Mon, 23 Feb 2009 22:08:28 -0800 (PST)
Subject: How do I count the distance between strings in a list?
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <86df098b-1274-4702-b353-b00418dc51a6@e18g2000yqo.googlegroups.com>

On Feb 23, 9:35?pm, collin <chaosm... at gmail.com> wrote:
> For example, if I were to have the code
>
> randomlist = ["1", "2", "3", "4"]
>
> And I want to count the distance between strings "1" and "4" which is
> 3, what command can I use to do this?

You'd have to get the indexes of the two items and subtract them.
There is an 'index' method on the List object for that.


From steven at REMOVE.THIS.cybersource.com.au  Tue Feb 24 01:11:29 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Feb 2009 06:11:29 GMT
Subject: How do I count the distance between strings in a list?
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <pan.2009.02.24.06.11.30@REMOVE.THIS.cybersource.com.au>

On Mon, 23 Feb 2009 21:35:21 -0800, collin wrote:

> For example, if I were to have the code
> 
> randomlist = ["1", "2", "3", "4"]
> 
> And I want to count the distance between strings "1" and "4" which is 3,
> what command can I use to do this?

This question is ambiguous. It could mean:

int("4") - int("1") 
=> 3

ord("4") - ord("1") 
=> 3

randomlist.index("4") - randomlist.index("1")
=> 3


and possible more as well. Perhaps you should explain what you want to 
do. What do you mean by "distance between strings", and is it important 
that they are in a list?



-- 
Steven


From martin at v.loewis.de  Tue Feb 24 01:11:38 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Tue, 24 Feb 2009 07:11:38 +0100
Subject: "Byte" type?
In-Reply-To: <49a36e1c$0$1586$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>		<go2dnf8lv6CDMgrUnZ2dnUVZ_vSdnZ2d@speakeasy.net>		<gn9621$2hk$1@ger.gmane.org>		<mailman.9565.1234708354.3487.python-list@python.org>		<499841bf$0$1624$742ec2ed@news.sonic.net>	<ec96e1390902150916w6daacca5j29149158d4d88f17@mail.gmail.com>	<499859e2$0$1618$742ec2ed@news.sonic.net>	<mailman.9587.1234730192.3487.python-list@python.org>	<499f8a8e$0$1588$742ec2ed@news.sonic.net>	<mailman.414.1235228520.11746.python-list@python.org><49a03081$0$1599$742ec2ed@news.sonic.net>	<gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
	<49a36e1c$0$1586$742ec2ed@news.sonic.net>
Message-ID: <49a38f9b$0$1880$9b622d9e@news.freenet.de>

>> Depends on how you write your code. If you use the bytearray type
>> (which John didn't, despite his apparent believe that he did),
>> then no conversion additional conversion is needed.
> 
>     According to PEP 3137, there should be no distinction between
> the two for read purposes.  In 2.6, there is.  That's a bug.

No. Python 2.6 doesn't implement PEP 3137, and the PEP doesn't claim
that it would, nor do the 2.6 release notes. So that it deviates from
PEP 3137 is not a bug.

>    No, it's broken.  PEP 3137 says one thing, and the 2.6 implementation
> does something else.  So code written for 2.6 won't be ready for 3.0.
> This defeats the supposed point of 2.6.

That's not true: if I write

   if isinstance(x, bytes):
      one_thing()
   elif isinstance(x, unicode):
      another_thing()

then 2to3 will convert it perfectly. 2to3 couldn't have done the
conversion correctly had I written

   if isinstance(x, str):
      one_thing()
   elif isinstance(x, unicode):
      another_thing()

So the introduction of the bytes builtin *does* help the supposed
point of 2.6, even though it doesn't help implementing PEP 3137.

Regards,
Martin


From dhananjay.c.joshi at gmail.com  Tue Feb 24 01:41:09 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Tue, 24 Feb 2009 12:11:09 +0530
Subject: How to read columns in python
Message-ID: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>

I am bit new to python and programming and this might be a basic question:

I have a file containing 3 columns.
first two columns are x and y axes and third column is their corresponding
values in the graph.

I want to read this in a matrix as well as plot in 2D.

Could anyone tell me how to do so the things.

Thanking you in advance



--  Dhananjay
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From clp2 at rebertia.com  Tue Feb 24 01:46:08 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 22:46:08 -0800
Subject: Problem in accessing files with unicode fonts.
In-Reply-To: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
Message-ID: <50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>

A. Your reason for emailing us off-list makes no sense. The list would
garner you more and about as quick responses, not to mention the value
it adds through public archiving. CC-ing us /might/ have made slight
sense.
B. This is your problem:
    v = unicode(full_path,errors='skip')
I'd advise you to read the docs for `unicode`, particularly what using
'skip' as the value of `errors` does.

Good day.

- Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com> wrote:
> Hello,
> ?? ? ? ? ? Sorry for mailing to your personal mails instead of mailing to
> the group. The reason being the intensity of the problem and time factor.
>
> Prob: I have a folder which contains files with unicode names ( Arabic,
> German etc). I am trying to obtain the attributes of those files recursively
> using win32api.getFileAttributes() function. Here is the code which i have
> for the same:
> ----------------------------------------------------------------------
> #!/usr/bin/env python
> import os
> import os.path
> import sys
> import urllib
> import win32api,string
> def findFile(dir_path):
> ?? ?for name in os.listdir(dir_path):
> ?? ? ? ?full_path = os.path.join(dir_path, name)
> ?? ? ? ?print full_path
> ?? ? ? ?if os.path.isdir(full_path):
> ?? ? ? ? ? ?findFile(full_path)
> ?? ? ? ?else:
> ?? ? ? ? ? ?v = unicode(full_path,errors='skip')
> ?? ? ? ? ? ?i = win32api.GetFileAttributes(v)
>
> findFile("F:\\DataSet\\Unicode")
> ---------------------------------------------------------------
> Now when I run this scirpt, the full_path variable which should contain the
> name of the file has "????" for non english ( I tried Arabic) characters. As
> a result the getfileattributes function is failing to recognise that file
> and is raising an exception.
> full_path:?F:\DataSet\Unicode\Arabic files\Arabic??????????????????????????
> {type is str}
> v:?F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type is
> unicode}
> TraceBack:
> Traceback (most recent call last):
> ??File "E:\venu\Testing Team\unitest.py", line 19, in <module>
> ?? ?findFile("F:\\DataSet\\Unicode")
> ??File "E:\venu\Testing Team\unitest.py", line 13, in findFile
> ?? ?findFile(full_path)
> ??File "E:\venu\Testing Team\unitest.py", line 16, in findFile
> ?? ?i = win32api.GetFileAttributes(v)
> error: (123, 'GetFileAttributes', 'The filename, directory name, or volume
> label syntax is incorrect.')
>
> Waiting for your reply.
> Thank you in advance.
> Venu.


From clp2 at rebertia.com  Tue Feb 24 01:48:11 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 23 Feb 2009 22:48:11 -0800
Subject: How to read columns in python
In-Reply-To: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
Message-ID: <50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>

On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay <dhananjay.c.joshi at gmail.com> wrote:
> I am bit new to python and programming and this might be a basic question:
>
> I have a file containing 3 columns.

Your question is much too vague to answer. What defines a "column" for
you? Tab-separated, comma-separated, or something else altogether?

- Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From dhananjay.c.joshi at gmail.com  Tue Feb 24 02:08:29 2009
From: dhananjay.c.joshi at gmail.com (Dhananjay)
Date: Tue, 24 Feb 2009 12:38:29 +0530
Subject: How to read columns in python
In-Reply-To: <50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>
	<50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
Message-ID: <de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>

Well,

The three columns are tab separated and there are 200 such rows having these
3 columns in the file.

First two columns are x and y coordinates and third column is the
corresponding value.

I want to read this file as a matrix in which column1 correspond to row,
column2 corresponds to columns(in matrix) and column3 corresponds to value
in the matrix.



-- Dhananjay



On Tue, Feb 24, 2009 at 12:18 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay <dhananjay.c.joshi at gmail.com>
> wrote:
> > I am bit new to python and programming and this might be a basic
> question:
> >
> > I have a file containing 3 columns.
>
> Your question is much too vague to answer. What defines a "column" for
> you? Tab-separated, comma-separated, or something else altogether?
>
> - Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>



-- 
--
--------------------------------------------------------------
Dhananjay C Joshi
Project Assistant
Lab of Structural Biology,
C D F D, ECIL Road, Nacharam
Hyderabad-500 076, INDIA
Tel : +91-40-27151344
Fax : +91-40-27155610
--------------------------------------------------------------
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From venutaurus539 at gmail.com  Tue Feb 24 02:15:33 2009
From: venutaurus539 at gmail.com (venu madhav)
Date: Tue, 24 Feb 2009 12:45:33 +0530
Subject: Problem in accessing files with unicode fonts.
In-Reply-To: <50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
Message-ID: <daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>

On Tue, Feb 24, 2009 at 12:16 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> A. Your reason for emailing us off-list makes no sense. The list would
> garner you more and about as quick responses, not to mention the value
> it adds through public archiving. CC-ing us /might/ have made slight
> sense.
> B. This is your problem:
>     v = unicode(full_path,errors='skip')
> I'd advise you to read the docs for `unicode`, particularly what using
> 'skip' as the value of `errors` does.
>
> Good day.
>
> - Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
>
> On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com>
> wrote:
> > Hello,
> >            Sorry for mailing to your personal mails instead of mailing to
> > the group. The reason being the intensity of the problem and time factor.
> >
> > Prob: I have a folder which contains files with unicode names ( Arabic,
> > German etc). I am trying to obtain the attributes of those files
> recursively
> > using win32api.getFileAttributes() function. Here is the code which i
> have
> > for the same:
> > ----------------------------------------------------------------------
> > #!/usr/bin/env python
> > import os
> > import os.path
> > import sys
> > import urllib
> > import win32api,string
> > def findFile(dir_path):
> >     for name in os.listdir(dir_path):
> >         full_path = os.path.join(dir_path, name)
> >         print full_path
> >         if os.path.isdir(full_path):
> >             findFile(full_path)
> >         else:
> >             v = unicode(full_path,errors='skip')
> >             i = win32api.GetFileAttributes(v)
> >
> > findFile("F:\\DataSet\\Unicode")
> > ---------------------------------------------------------------
> > Now when I run this scirpt, the full_path variable which should contain
> the
> > name of the file has "????" for non english ( I tried Arabic) characters.
> As
> > a result the getfileattributes function is failing to recognise that file
> > and is raising an exception.
> > full_path: F:\DataSet\Unicode\Arabic
> files\Arabic??????????????????????????
> > {type is str}
> > v: F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type
> is
> > unicode}
> > TraceBack:
> > Traceback (most recent call last):
> >   File "E:\venu\Testing Team\unitest.py", line 19, in <module>
> >     findFile("F:\\DataSet\\Unicode")
> >   File "E:\venu\Testing Team\unitest.py", line 13, in findFile
> >     findFile(full_path)
> >   File "E:\venu\Testing Team\unitest.py", line 16, in findFile
> >     i = win32api.GetFileAttributes(v)
> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
> volume
> > label syntax is incorrect.')
> >
> > Waiting for your reply.
> > Thank you in advance.
> > Venu.
>

Hello,
        As you've said I went through the documentation for unicode
function.It takes the file name as the first argument and then based on the
second (whether you skip, ignore or strict) does the action. Any of those
ways is not solving my problem. Since, using skip or ignore removes the
unicode characters from the file name, the win32 function is failing to find
that filename. I tried to change the default encoding to unicode in site.py
scirpt but didn't give any results.


Thank you,
Venu
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From mcfletch at vrplumber.com  Tue Feb 24 02:30:41 2009
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 24 Feb 2009 02:30:41 -0500
Subject: ANN: SuPy 1.6
In-Reply-To: <49A3561A.8000900@canterbury.ac.nz>
References: <49A3561A.8000900@canterbury.ac.nz>
Message-ID: <49A3A221.8070602@vrplumber.com>

Greg Ewing wrote:
...
> What is SuPy?
> -------------
>
> SuPy is a plugin for the Sketchup 3D modelling application
> that lets you script it in Python.
Hi Greg,

Can you review the SuPy writeup on Py3D?  I couldn't get through to your 
server this evening, so I couldn't check the license, if there's 
anything else you feel should be said about the program, let me know.

http://www.vrplumber.com/py3d.py#supy

Have fun,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From apardon at forel.vub.ac.be  Tue Feb 24 02:54:07 2009
From: apardon at forel.vub.ac.be (Antoon Pardon)
Date: 24 Feb 2009 07:54:07 GMT
Subject: bool evaluations of generators vs lists
References: <20090210111514.07e0480a@microvu.com>
	<1234294770.8528.14.camel@localhost.localdomain>
	<20090210125002.1f6d8597@microvu.com>
	<mailman.9270.1234301142.3487.python-list@python.org>
Message-ID: <slrngq79su.g4q.apardon@rcpc42.vub.ac.be>

On 2009-02-10, Albert Hopkins <marduk at letterboxes.org> wrote:
> On Tue, 2009-02-10 at 12:50 -0800, Josh Dukes wrote:
>
> I don't understand what you mean by this.  But if you really want to
> know if a generator is "non-empty":
>
> def non_empty(virgin_generator):
>     try:
>         virgin_generator.next() # note you just lost the first value
>         return True
>     except StopIteration:
>         return False
>
> The only way to get around this is to put all the values of a generator
> inside a container (e.g. a list):
>
> l = list(generator_object)
>
> but in doing so you've (obviously) lost the advantages of the generator.

Well he could always use a wrapper like the following:

nothing = object()

class BoolIterator (object):
  def __init__(self, iter):
    self.iter = iter
    self.value = nothing
    self.item = nothing

  def __iter__(self):
    return (self)

  def __nonzero__(self):
    if self.value is nothing:
      try:
        self.item = self.iter.next()
        self.value = True
        return True
      except StopIteration:
        self.value = False
        return False
    else:
      return self.value

  def next(self):
    if self.item is not nothing:
      result = self.item
      self.item = nothing
      return result
    if self.value is not nothing:
      return self.iter.next()
    else:
      try:
        result = self.iter.next()
        self.value = True
        return result
      except StopIteration:
        self.value = False
        raise

it1 = BoolIterator(i for i in xrange(10))

for i in it1:
  print i

it2 = BoolIterator(i for i in xrange(10))

if it2:
  print "item found"
  for i in it2:
    print i
else:
  print "problem"

it3 = BoolIterator(i for i in xrange(0))

if it3:
  print "problem"
else:
  print "it3 is empty"



From metolone+gmane at gmail.com  Tue Feb 24 02:56:54 2009
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Mon, 23 Feb 2009 23:56:54 -0800
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com><50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
Message-ID: <go0982$msn$1@ger.gmane.org>

Try os.walk for recursively walking directories.  Also if you use a unicode parameter with os.walk or os.listdir you get unicode strings in the result.  To run this successfully when you have non-ascii characters in your filenames, you will need to use an environment that supports the characters you want to print.  The Windows console, for example, typically only supports a native encoding such as cp437 or cp1252 (on U.S. systems).  If all else fails write the output to a file in your favorite encoding:

# coding: gbk
import os
import codecs
output = codecs.open(u'??.txt','wt',encoding='utf-8')
for path,dirs,files in os.walk(u'.'):
    for fname in files:
        output.write(os.path.join(path,fname)+'\n')
output.close()


-Mark

  "venu madhav" <venutaurus539 at gmail.com> wrote in message news:daf1e02e0902232315j7e66593ewecfdd739972ad676 at mail.gmail.com...



  On Tue, Feb 24, 2009 at 12:16 PM, Chris Rebert <clp2 at rebertia.com> wrote:

    A. Your reason for emailing us off-list makes no sense. The list would
    garner you more and about as quick responses, not to mention the value
    it adds through public archiving. CC-ing us /might/ have made slight
    sense.
    B. This is your problem:

       v = unicode(full_path,errors='skip')

    I'd advise you to read the docs for `unicode`, particularly what using
    'skip' as the value of `errors` does.

    Good day.

    - Chris

    --
    Follow the path of the Iguana...
    http://rebertia.com



    On Mon, Feb 23, 2009 at 10:31 PM, venu madhav <venutaurus539 at gmail.com> wrote:
    > Hello,
    >            Sorry for mailing to your personal mails instead of mailing to
    > the group. The reason being the intensity of the problem and time factor.
    >
    > Prob: I have a folder which contains files with unicode names ( Arabic,
    > German etc). I am trying to obtain the attributes of those files recursively
    > using win32api.getFileAttributes() function. Here is the code which i have
    > for the same:
    > ----------------------------------------------------------------------
    > #!/usr/bin/env python
    > import os
    > import os.path
    > import sys
    > import urllib
    > import win32api,string
    > def findFile(dir_path):
    >     for name in os.listdir(dir_path):
    >         full_path = os.path.join(dir_path, name)
    >         print full_path
    >         if os.path.isdir(full_path):
    >             findFile(full_path)
    >         else:
    >             v = unicode(full_path,errors='skip')
    >             i = win32api.GetFileAttributes(v)
    >
    > findFile("F:\\DataSet\\Unicode")
    > ---------------------------------------------------------------
    > Now when I run this scirpt, the full_path variable which should contain the
    > name of the file has "????" for non english ( I tried Arabic) characters. As
    > a result the getfileattributes function is failing to recognise that file
    > and is raising an exception.
    > full_path: F:\DataSet\Unicode\Arabic files\Arabic??????????????????????????
    > {type is str}
    > v: F:\DataSet\Unicode\Arabic files\Arabic?????????????????????????? {type is
    > unicode}
    > TraceBack:
    > Traceback (most recent call last):
    >   File "E:\venu\Testing Team\unitest.py", line 19, in <module>
    >     findFile("F:\\DataSet\\Unicode")
    >   File "E:\venu\Testing Team\unitest.py", line 13, in findFile
    >     findFile(full_path)
    >   File "E:\venu\Testing Team\unitest.py", line 16, in findFile
    >     i = win32api.GetFileAttributes(v)
    > error: (123, 'GetFileAttributes', 'The filename, directory name, or volume
    > label syntax is incorrect.')
    >
    > Waiting for your reply.
    > Thank you in advance.
    > Venu.



  Hello,
          As you've said I went through the documentation for unicode function.It takes the file name as the first argument and then based on the second (whether you skip, ignore or strict) does the action. Any of those ways is not solving my problem. Since, using skip or ignore removes the unicode characters from the file name, the win32 function is failing to find that filename. I tried to change the default encoding to unicode in site.py scirpt but didn't give any results.




  Thank you,
  Venu


------------------------------------------------------------------------------


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  http://mail.python.org/mailman/listinfo/python-list
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From ccormie at aussiemail.com.au  Tue Feb 24 03:00:26 2009
From: ccormie at aussiemail.com.au (Chris Cormie)
Date: Tue, 24 Feb 2009 19:00:26 +1100
Subject: How does one get from "ImportError: DLL load failed:..." to a
	culprit .dll and symbol?
In-Reply-To: <68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>
References: <01b213c7$0$20626$c3e8da3@news.astraweb.com>
	<5850dc46-638f-4a3c-8d9a-f84bf7523979@o11g2000yql.googlegroups.com>
	<01b28edb$0$20619$c3e8da3@news.astraweb.com>
	<mailman.577.1235425832.11746.python-list@python.org>
	<01b364cd$0$5185$c3e8da3@news.astraweb.com>
	<68447ae6-0b51-47ca-9a10-35d806f9b7e1@v15g2000yqn.googlegroups.com>
Message-ID: <01b39e7f$0$20621$c3e8da3@news.astraweb.com>


> My reading of the Python 2.6.1 version of dynload_win.c tells me that:
> 
> 1. It uses LoadLibraryEx() to attempt to load the pyd given its full
> pathname
> 
> 2. If that fails, it gets the Windows error code using GetLastError()
> 
> 3. It gets the Windows message text using FormatMessage()
> 
> 4. It assembles the message as "DLL load failed: " plus the Windows
> message text (less any trailing "\r\n").
> 
> Note that if the pyd load succeeds, it rummages in memory to find the
> pythonxx.dll used by the pyd so that it can be checked for
> consistency. Then and only then it uses GetProcAddress() to get the
> address of the initFOO function.
> 
> Do you know a way of getting more info out of Windows than GetLastError
> ()?

Thank you for your help, it is much appreciated:

In summary:

Q) How can one get Python to tell you which symbol is causing a problem 
when it loads an extension with a bad reference to a symbol in a DLL it 
uses?

A) There is no such way: you *must* use external tools: When a symbol is 
missing form a DLL that a Python extension depends on, the failure will 
be picked up in Python immediately on attempting to load the extension: 
the extension code is never reached and there is no specific attempt 
made in Python to resolve the problem symbol. further, The normal 
platform APIs lack the ability to determine the cause of the load failure.

 > Do you know a way of getting more info out of Windows than GetLastError
 > ()?

No, but presumably the ability to determine in code that a DLL has a bad 
reference and which symbol is bad exists because the depends program is 
able to do it. Of course it's a separate question as to whether Python 
wants to load itself down with complex platform specific code for a 
small corner case.

Best Regards,
Chris.


From sjmachin at lexicon.net  Tue Feb 24 03:07:50 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 00:07:50 -0800 (PST)
Subject: read csv error question
References: <77e831100902231518q7a29e251s956be0b77d2613d@mail.gmail.com> 
	<mailman.595.1235432572.11746.python-list@python.org>
Message-ID: <1a434a76-f956-4848-a1eb-e46f96476f61@v39g2000yqm.googlegroups.com>

On Feb 24, 10:42?am, rdmur... at bitdance.com wrote:
> Vincent Davis <vinc... at vincentdavis.net> wrote:
> > I am trying to read a csv file from excel on a mac. I get the following
> > error.SystemExit: file some.csv, line 1: new-line character seen in unquoted
> > field - do you need to open the file in universal-newline mode?
> > I was using the example code
> > import csv, sys
>
> > reader = csv.reader(open('/Volumes/vincentdavis
> > 2/match/data/matchdata2008.csv', "rb"))
> > try:
> > ? ? for row in reader:
> > ? ? ? ? print row
> > except csv.Error, e:
> > ? ? sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))
>
> > I think this has to do with the end of line character but I am unsure how to
> > fix it. I don't what to change the actual csv file I would like to fix the
> > code.
>
> You could try reading the error message and looking at the documentation
> of the 'open' function. ?Pay particular attention to the keywords
> 'universal-newline mode'.
>
> Hint: 'rb' is almost the opposite of universal newline mode, and
> it is very rare that you'd want to use 'b' to read a text file.
>
> --RDM

A CSV file is *NOT* a text file. See the module docs. Also see this:
http://bugs.python.org/issue4847


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 03:39:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 06:39:17 -0200
Subject: opening files with names in non-english characters.
References: <5b6a03dc-0393-46e6-bff0-c36669a67340@w34g2000yqm.googlegroups.com>
	<mailman.533.1235412173.11746.python-list@python.org>
	<1378a511-fe4e-4fe2-a8b0-46022e472d24@x10g2000yqk.googlegroups.com>
Message-ID: <op.upukzrtlx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 01:29:07 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

>         First of all thanks for your response. I've written a function
> as shown below to recurse a directory and return a file based on the
> value of n. I am calling this fucntion from my main code to catch that
> filename. The folder which it recurses through contains a folder
> having files with unicode names (as an example i've given earlier.


> ---------------------------------------------------------------
> def findFile(dir_path):
>     for name in os.listdir(dir_path):
>         full_path = os.path.join(dir_path, name)
>         print full_path
>         if os.path.isdir(full_path):
>             findFile(full_path)

Here, you're simply discarding the result from the recursive call. Try  
something like this:

              result = findFile(full_path)
              if result is not None:
                  return result

>         else:
>             n = n - 1
>             if(n ==0):
>                 return full_path
> ---------------------------------------------------------------

Now, what happens if you forget about findFile and try with a direct name  
instead?

fpath =  
r"E:\DataSet\Unicode\UnicodeFiles_8859\001_0006_test_folder\0003testUnicode_??I?NOK?????U???UU?a??????ic?e?e??idnok?????u???uu.txt.txt"
st = os.stat(path)
print st

-- 
Gabriel Genellina



From andrew at acooke.org  Tue Feb 24 03:44:01 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 24 Feb 2009 05:44:01 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
Message-ID: <a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>

Steven D'Aprano wrote:
> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>
>> Steven D'Aprano wrote:
>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>
>>>> as far as i understand things, the best model is:
>>>>
>>>> 1 - everything is an object
>>>> 2 - everything is passed by reference
>>>
>>> Except that is wrong. If it were true, you could do this:
>> [pointer swapping]
>>
>> i was thinking of how the stack is used; i would have called what you
>> are talking about "pointer semantics".  however, on reading around a
>> little, it seems that i'm in a very small minority (which is a pity,
>> because if you restrict the meaning to how values are handled on the
>> stack then you get a lot closer to having just values and references,
>> rather than the whole pile of different terms that are apparently in
>> use).
>>
>> sorry for the confusion,
>
> Why is it a pity to have a whole pile of different terms to describe a
> whole lot of different behaviours? I would suggest the real confusion
> would be if we had two terms to describe a dozen different parameter-
> passing conventions.

because:

(1) it's often useful to explain things as (simpler) orthogonal components
rather than globbing everything under one term; that lets you more easily
carry across knowledge from previous experience.

(2) while using a term that has (according to wikipedia) "widespread usage
in the Python community" helps you save time and avoid confusion, it
doesn't necessarily explain best to someone from outside that community
what is happening.  in this particular case you are getting dangerously
close to having a term that is used only for one language and which,
therefore, is at risk of meaning little more that "the way python does it"
(which is, i think you'll agree, more tautological than helpful).

andrew




From gagsl-py2 at yahoo.com.ar  Tue Feb 24 03:44:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 06:44:27 -0200
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
Message-ID: <op.upuk8depx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 05:15:33 -0200, venu madhav <venutaurus539 at gmail.com>  
escribi?:

>> > def findFile(dir_path):
>> >     for name in os.listdir(dir_path):
>> >         full_path = os.path.join(dir_path, name)
>> >         print full_path
>> >         if os.path.isdir(full_path):
>> >             findFile(full_path)
>> >         else:
>> >             v = unicode(full_path,errors='skip')
>> >             i = win32api.GetFileAttributes(v)
>> >
>> > findFile("F:\\DataSet\\Unicode")
>> > ---------------------------------------------------------------
>> > Now when I run this scirpt, the full_path variable which should  
>> contain
>> the
>> > name of the file has "????" for non english ( I tried Arabic)  
>> characters.
>> As
>> > a result the getfileattributes function is failing to recognise that  
>> file
>> > and is raising an exception.
>> >     i = win32api.GetFileAttributes(v)
>> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
>> volume
>> > label syntax is incorrect.')

If you call os.listdir with an unicode directory, it returns unicode file  
names.
That is (after correcting the previous error in findFile), call it using:
findFile(u"F:\\DataSet\\Unicode")

-- 
Gabriel Genellina



From venutaurus539 at gmail.com  Tue Feb 24 04:18:41 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 01:18:41 -0800 (PST)
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com> 
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com> 
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com> 
	<mailman.648.1235465092.11746.python-list@python.org>
Message-ID: <e621cf58-54d9-4aab-b5e9-1a853844074c@n2g2000vba.googlegroups.com>

On Feb 24, 1:44?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 24 Feb 2009 05:15:33 -0200, venu madhav <venutaurus... at gmail.com> ?
> escribi?:
>
>
>
> >> > def findFile(dir_path):
> >> > ? ? for name in os.listdir(dir_path):
> >> > ? ? ? ? full_path = os.path.join(dir_path, name)
> >> > ? ? ? ? print full_path
> >> > ? ? ? ? if os.path.isdir(full_path):
> >> > ? ? ? ? ? ? findFile(full_path)
> >> > ? ? ? ? else:
> >> > ? ? ? ? ? ? v = unicode(full_path,errors='skip')
> >> > ? ? ? ? ? ? i = win32api.GetFileAttributes(v)
>
> >> > findFile("F:\\DataSet\\Unicode")
> >> > ---------------------------------------------------------------
> >> > Now when I run this scirpt, the full_path variable which should ?
> >> contain
> >> the
> >> > name of the file has "????" for non english ( I tried Arabic) ?
> >> characters.
> >> As
> >> > a result the getfileattributes function is failing to recognise that ?
> >> file
> >> > and is raising an exception.
> >> > ? ? i = win32api.GetFileAttributes(v)
> >> > error: (123, 'GetFileAttributes', 'The filename, directory name, or
> >> volume
> >> > label syntax is incorrect.')
>
> If you call os.listdir with an unicode directory, it returns unicode file ?
> names.
> That is (after correcting the previous error in findFile), call it using:
> findFile(u"F:\\DataSet\\Unicode")
>
> --
> Gabriel Genellina

Thank you for your solution. It really helped. But how should I give
if my path is in a varialble.

For ex: path has that value obtained through command line arguments.

path = sys.argv[2]

In such a case how can we convert the path to UNICODE?

Thank you once again,
Venu







From nick at craig-wood.com  Tue Feb 24 04:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 24 Feb 2009 03:31:53 -0600
Subject: intermediate python csv reader/writer question from a beginner
References: <e90792b0-e544-4ecc-b32a-6f6e416d2705@41g2000yqf.googlegroups.com>
Message-ID: <slrngq7e5s.sms.nick@irishsea.home.craig-wood.com>

Learning Python <labmice at gmail.com> wrote:
>  anything related to csv, I usually use VB within excel to manipulate
>  the data, nonetheless, i finally got the courage to take a dive into
>  python.  i have viewed a lot of googled csv tutorials, but none of
>  them address everything i need.  Nonetheless, I was wondering if
>  someone can help me manipulate the sample csv (sample.csv) I have
>  generated:
> 
>  ,,
>  someinfo,,,,,,,
>  somotherinfo,,,,,,,
>  SEQ,Names,Test1,Test2,Date,Time,,
>  1,Adam,1,2,Monday,1:00 PM,,
>  2,Bob,3,4,Monday,1:00 PM,,
>  3,Charlie,5,6,Monday,1:00 PM,,
>  4,Adam,7,8,Monday,2:00 PM,,
>  5,Bob,9,10,Monday,2:00 PM,,
>  6,Charlie,11,12,Monday,2:00 PM,,
>  7,Adam,13,14,Tuesday,1:00 PM,,
>  8,Bob,15,16,Tuesday,1:00 PM,,
>  9,Charlie,17,18,Tuesday,1:00 PM,,
> 
>  into (newfile.csv):
> 
>  Adam-Test1,Adam-Test2,Bob-Test1,Bob-Test2,Charlie-Test1,Charlie-
>  Test2,Date,Time
>  1,2,3,4,5,6,Monday,1:00 PM
>  7,8,9,10,11,12,Monday,2:00 PM
>  13,14,15,16,17,18,Tuesday,1:00 PM
> 
>  note:
>  1. the true header doesn't start line 4 (if this is the case would i
>  have to use "split"?)
>  2. if there were SEQ#10-12, or 13-15, it would still be Adam, Bob,
>  Charlie, but with different Test1/Test2/Date/Time

I'm not really sure what you are trying to calculate, but this should
give you some ideas...

import csv
from collections import defaultdict

reader = csv.reader(open("sample.csv"))
result = defaultdict(list)
for row in reader:
    # ignore unless first row is numeric
    if not row or not row[0].isdigit():
        continue
    n, name, a, b, day, time = row[:6]
    print "n=%r, name=%r, a=%r, b=%r, day=%r, time=%r" % (n, name, a,
    b, day, time)
    result[(day, time)].append(n)

writer = csv.writer(open("newfile.csv", "w"))
for key, values in result.iteritems():
    day, time = key
    values = values + [day, time]
    writer.writerow(values)

This prints

n='1', name='Adam', a='1', b='2', day='Monday', time='1:00 PM'
n='2', name='Bob', a='3', b='4', day='Monday', time='1:00 PM'
n='3', name='Charlie', a='5', b='6', day='Monday', time='1:00 PM'
n='4', name='Adam', a='7', b='8', day='Monday', time='2:00 PM'
n='5', name='Bob', a='9', b='10', day='Monday', time='2:00 PM'
n='6', name='Charlie', a='11', b='12', day='Monday', time='2:00 PM'
n='7', name='Adam', a='13', b='14', day='Tuesday', time='1:00 PM'
n='8', name='Bob', a='15', b='16', day='Tuesday', time='1:00 PM'
n='9', name='Charlie', a='17', b='18', day='Tuesday', time='1:00 PM'

And leaves newfile.csv with the contents

1,2,3,Monday,1:00 PM
7,8,9,Tuesday,1:00 PM
4,5,6,Monday,2:00 PM

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 04:36:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 07:36:51 -0200
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>
Message-ID: <op.upunnpivx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 06:44:01 -0200, andrew cooke <andrew at acooke.org>  
escribi?:

> Steven D'Aprano wrote:
>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>
>>> Steven D'Aprano wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>> [pointer swapping]
>>>
>>> i was thinking of how the stack is used; i would have called what you
>>> are talking about "pointer semantics".  however, on reading around a
>>> little, it seems that i'm in a very small minority (which is a pity,
>>> because if you restrict the meaning to how values are handled on the
>>> stack then you get a lot closer to having just values and references,
>>> rather than the whole pile of different terms that are apparently in
>>> use).
>>>
>>> sorry for the confusion,
>>
>> Why is it a pity to have a whole pile of different terms to describe a
>> whole lot of different behaviours? I would suggest the real confusion
>> would be if we had two terms to describe a dozen different parameter-
>> passing conventions.
>
> because:
>
> (1) it's often useful to explain things as (simpler) orthogonal  
> components
> rather than globbing everything under one term; that lets you more easily
> carry across knowledge from previous experience.
>
> (2) while using a term that has (according to wikipedia) "widespread  
> usage
> in the Python community" helps you save time and avoid confusion, it
> doesn't necessarily explain best to someone from outside that community
> what is happening.  in this particular case you are getting dangerously
> close to having a term that is used only for one language and which,
> therefore, is at risk of meaning little more that "the way python does  
> it"
> (which is, i think you'll agree, more tautological than helpful).

But -paraphrasing A.E.- we should explain it in the simplest terms, but  
not simpler.

Some people think that there exist only two possible ways to pass an  
argument: by value or by reference. The way Python does it doesn't have  
the same properties that pass-by-value nor pass-by-reference have in other  
languages, so both names are inapropiate. You appear to favor the "by  
reference" name. A couple months ago some other guy were strongly  
defending the "by value" name -- he even set up a website supporting his  
idea.

The fact is, if you say "it's by value" you'll disappoint some  
expectations from some users, and if you say "it's by reference" you'll  
disappoint some other expectations. So you must say something different  
("it's by reference, but the references cannot be modified (!), and...",  
"it's by value, but the values are references (!!), and...", or whatever  
description you choose). Given that, it's better to use a different name:  
you're going to explain the concept anyway.

And Python isn't the first language using this convention; if you look in  
the FAQ or search recent threads in this group you'll find references  
going back to the '70s.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Feb 24 04:45:35 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 07:45:35 -0200
Subject: Problem in accessing files with unicode fonts.
References: <daf1e02e0902232231s44e559f6xce19cb251fe3afca@mail.gmail.com>
	<50697b2c0902232246t66922c39i9a73996be230d1a4@mail.gmail.com>
	<daf1e02e0902232315j7e66593ewecfdd739972ad676@mail.gmail.com>
	<mailman.648.1235465092.11746.python-list@python.org>
	<e621cf58-54d9-4aab-b5e9-1a853844074c@n2g2000vba.googlegroups.com>
Message-ID: <op.upun19z3x6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 07:18:41 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

> Thank you for your solution. It really helped. But how should I give
> if my path is in a varialble.
>
> For ex: path has that value obtained through command line arguments.
>
> path = sys.argv[2]
>
> In such a case how can we convert the path to UNICODE?

If you know the encoding used for your file names, use it; else try  
sys.getfilesystemencoding()

fsencoding = sys.getfilesystemencoding()
path = sys.argv[2].decode(fsencoding)

-- 
Gabriel Genellina



From andrew at acooke.org  Tue Feb 24 04:58:08 2009
From: andrew at acooke.org (andrew cooke)
Date: Tue, 24 Feb 2009 06:58:08 -0300 (CLST)
Subject: Reference or Value?
In-Reply-To: <op.upunnpivx6zn5v@gabriel.sleipnir-bsas>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<a5dd4b9c57329aa4dfbca548b3b58856.squirrel@localhost>
	<op.upunnpivx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <51a82ff3d4a9eee147380c48e72e0cb2.squirrel@localhost>

Gabriel Genellina wrote:
> En Tue, 24 Feb 2009 06:44:01 -0200, andrew cooke <andrew at acooke.org>
> escribi?:
>
>> Steven D'Aprano wrote:
>>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>>
>>>> Steven D'Aprano wrote:
>>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>>
>>>>>> as far as i understand things, the best model is:
>>>>>>
>>>>>> 1 - everything is an object
>>>>>> 2 - everything is passed by reference
>>>>>
>>>>> Except that is wrong. If it were true, you could do this:
>>>> [pointer swapping]
>>>>
>>>> i was thinking of how the stack is used; i would have called what you
>>>> are talking about "pointer semantics".  however, on reading around a
>>>> little, it seems that i'm in a very small minority (which is a pity,
>>>> because if you restrict the meaning to how values are handled on the
>>>> stack then you get a lot closer to having just values and references,
>>>> rather than the whole pile of different terms that are apparently in
>>>> use).
>>>>
>>>> sorry for the confusion,
>>>
>>> Why is it a pity to have a whole pile of different terms to describe a
>>> whole lot of different behaviours? I would suggest the real confusion
>>> would be if we had two terms to describe a dozen different parameter-
>>> passing conventions.
>>
>> because:
>>
>> (1) it's often useful to explain things as (simpler) orthogonal
>> components
>> rather than globbing everything under one term; that lets you more
>> easily
>> carry across knowledge from previous experience.
>>
>> (2) while using a term that has (according to wikipedia) "widespread
>> usage
>> in the Python community" helps you save time and avoid confusion, it
>> doesn't necessarily explain best to someone from outside that community
>> what is happening.  in this particular case you are getting dangerously
>> close to having a term that is used only for one language and which,
>> therefore, is at risk of meaning little more that "the way python does
>> it"
>> (which is, i think you'll agree, more tautological than helpful).
>
> But -paraphrasing A.E.- we should explain it in the simplest terms, but
> not simpler.
>
> Some people think that there exist only two possible ways to pass an
> argument: by value or by reference. The way Python does it doesn't have
> the same properties that pass-by-value nor pass-by-reference have in other
> languages, so both names are inapropiate. You appear to favor the "by
> reference" name. A couple months ago some other guy were strongly
> defending the "by value" name -- he even set up a website supporting his
> idea.
>
> The fact is, if you say "it's by value" you'll disappoint some
> expectations from some users, and if you say "it's by reference" you'll
> disappoint some other expectations. So you must say something different
> ("it's by reference, but the references cannot be modified (!), and...",
> "it's by value, but the values are references (!!), and...", or whatever
> description you choose). Given that, it's better to use a different name:
> you're going to explain the concept anyway.


if you read my post i think you'll find i was not advocating either of those.

i really think this discussion has gone on far enough; i have better
things to do.

andrew


> And Python isn't the first language using this convention; if you look in
> the FAQ or search recent threads in this group you'll find references
> going back to the '70s.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>




From pavlovevidence at gmail.com  Tue Feb 24 05:04:16 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 24 Feb 2009 02:04:16 -0800 (PST)
Subject: A tale of two execs
References: <ac460593-37cf-4f65-88c0-cac4f46b92e9@v13g2000yqm.googlegroups.com>
	<mailman.544.1235416507.11746.python-list@python.org>
	<7d85586a-d746-4e0f-b01b-86bf2e388971@f18g2000vbf.googlegroups.com>
	<fdc61788-a453-4506-a422-658b374f93c4@e18g2000yqo.googlegroups.com> 
	<mailman.587.1235430309.11746.python-list@python.org>
	<794a35cc-f530-43e7-97c5-87694f27b573@x9g2000yqk.googlegroups.com>
Message-ID: <9095ae87-c11d-4439-aeed-05533c610e54@m24g2000vbp.googlegroups.com>

On Feb 23, 9:13?pm, aha <aquil.abdul... at gmail.com> wrote:
> Hello All,
> ? It occurred to me that I might just want to try copying the
> subprocess.py installed in a /usr/lib/python24 installation to the
> directory where I place the scripts that I need to launch my
> application...I know this was mentioned earlier. ?Anyway, my
> application worked under python 2.3 and later python versions as
> well. ?Here is what I did:
>
> I renamed subprocess.py to subprocess23.py and then used the following
> code:
>
> try:
> ? import subprocess
> except ImportError:
> ? import subprocess23 as subprocess
>
> I chose this route because I took a deeper look at the code in the
> subprocess module and I also realized that I would not be able to use
> the popen2, because I would not be able to do things like os.setpgrp
> for preexec_fn, with popen2. ?In the end, if I wanted that type of
> functionality I would have to use os.dup, fork, exec, which meant
> reinventing the wheel. ?I overcame the issue of dealing with msvcrt
> and _subprocess under windows by requiring python24 or greater under
> windows.


Distributing the interpreter doesn't look quite as silly as it did
this morning now, does it?


Carl Banks


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 05:33:11 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 08:33:11 -0200
Subject: tkinter icons as bytestrings, not files?
References: <slrngq6vfd.2u7.peter@box8.pjb.com.au>
Message-ID: <op.upup9ljcx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 02:56:12 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> As a newbie, starting with Python3, I'm working my way through Mark
> Summerfield's tkinter examples.  In the toolbar, there's lines like:

>     image = os.path.join(os.path.dirname(__file__), image)
>     image = tkinter.PhotoImage(file=image)
>
> which are always failing because the icons are in the wrong place
> and I can't help but wonder if I can put all these little images
> in the application itself, either as b'whatever' or uuencoded or
> in svg etc, and then invoke some suitable variation of the
>     image = tkinter.PhotoImage(file=image)
> or of the
>     button = tkinter.Button(toolbar, image=image, command=command)
> command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
> magic key (unless it's "data=something, format=something")) ...

Almost; see the best documentation source for tkinter:
http://effbot.org/tkinterbook/photoimage.htm

-- 
Gabriel Genellina



From yatsek at gmail.com  Tue Feb 24 05:48:10 2009
From: yatsek at gmail.com (yatsek at gmail.com)
Date: Tue, 24 Feb 2009 02:48:10 -0800 (PST)
Subject: Python, HTTPS (SSL), tlslite and POST method (and lots of pain)
References: <00e56c9a-85a7-440c-a48d-2a0ea9e00992@j35g2000yqh.googlegroups.com>
Message-ID: <dfede125-d8eb-4fbb-b45a-0f52a9acf4c0@d32g2000yqe.googlegroups.com>

OK I found workaround.

So just for other fighting the same thing:
Instead of using tlslite use pyOpenSSL and as a base for your server
you can use:
http://code.activestate.com/recipes/442473/

When you add do_POST method everything works

greetz
Jacek


From steve at pearwood.info  Tue Feb 24 05:49:26 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Tue, 24 Feb 2009 21:49:26 +1100
Subject: Reference or Value?
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<mailman.647.1235465046.11746.python-list@python.org>
Message-ID: <01b3c619$0$23707$c3e8da3@news.astraweb.com>

andrew cooke wrote:

> Steven D'Aprano wrote:
>> On Mon, 23 Feb 2009 08:14:34 -0300, andrew cooke wrote:
>>
>>> Steven D'Aprano wrote:
>>>> On Sun, 22 Feb 2009 13:37:27 -0300, andrew cooke wrote:
>>>>
>>>>> as far as i understand things, the best model is:
>>>>>
>>>>> 1 - everything is an object
>>>>> 2 - everything is passed by reference
>>>>
>>>> Except that is wrong. If it were true, you could do this:
>>> [pointer swapping]
>>>
>>> i was thinking of how the stack is used; i would have called what you
>>> are talking about "pointer semantics".  however, on reading around a
>>> little, it seems that i'm in a very small minority (which is a pity,
>>> because if you restrict the meaning to how values are handled on the
>>> stack then you get a lot closer to having just values and references,
>>> rather than the whole pile of different terms that are apparently in
>>> use).
>>>
>>> sorry for the confusion,
>>
>> Why is it a pity to have a whole pile of different terms to describe a
>> whole lot of different behaviours? I would suggest the real confusion
>> would be if we had two terms to describe a dozen different parameter-
>> passing conventions.
> 
> because:
> 
> (1) it's often useful to explain things as (simpler) orthogonal components
> rather than globbing everything under one term; 

"One term"? 

If you look at this Wikipedia page:

http://en.wikipedia.org/wiki/Evaluation_strategy

you should be able to count no fewer than thirteen different terms for 
different evaluation strategies, and "call-by-value" itself is described as
a family of strategies. Who is gobbing everything under one term? Certainly
not me. If anything, your preferred tactic is to gob everything under one
of two terms, call-by-value and call-by-reference. That's not my preferred
tactic.


> that lets you more easily 
> carry across knowledge from previous experience.

That's only useful if that previous experience *clarifies* rather than
*confuses*. This very thread demonstrates that people's prior knowledge of
call-by-whatever doesn't clarify Python's behaviour.


> (2) while using a term that has (according to wikipedia) "widespread usage
> in the Python community" helps you save time and avoid confusion, it
> doesn't necessarily explain best to someone from outside that community
> what is happening.  

And you think call-by-reference does?

Python demonstrably does not behave like call-by-reference in other
languages. I do not agree that it is wise to hammer the round peg of
Python's actual behaviour into the square peg of newbies' concept of
call-by-reference. 


> in this particular case you are getting dangerously 
> close to having a term that is used only for one language 

So what? What if Python was the only language that used the term? That
doesn't make it inappropriate. If the users of other languages that use
call-by-object semantics (Java, RealBasic, etc) choose to prefer a
misleading name over a descriptive name, that's no reason for Python users
to follow down their path.


> and which, 
> therefore, is at risk of meaning little more that "the way python does it"
> (which is, i think you'll agree, more tautological than helpful).

No at all. Do you imagine that call-by-name means "the way Algol does it"?
Algol is the only major language that uses call-by-name, it may even be the
only language of any size, but that doesn't mean that call-by-name can't be
defined and described independently of Algol. There's even a test,
Knuth's "Man Or Boy Test", for testing how well a language implements
call-by-name semantics.



-- 
Steven



From pablo.stapff at gmail.com  Tue Feb 24 06:18:26 2009
From: pablo.stapff at gmail.com (PS)
Date: Tue, 24 Feb 2009 03:18:26 -0800 (PST)
Subject: undefined reference to `init_warnings'  when compiling after 
	freeze...
Message-ID: <3d4eed77-ed87-4a14-bc68-8887ddeb4389@j12g2000vbl.googlegroups.com>

Hello Python users

I am trying to compile .py files using freeze with Python 2.6.1, but I
get an error even when trying with hello.py from the examples.

Freeze semes to do its work (last lines only):

ps at linux-s7f4:~/soft/Python-2.6.1/Tools/freeze> python freeze.py
hello.py

generating table of frozen modules
Warning: unknown modules remain: _bisect _collections _ctypes
_functools _heapq _locale _random _socket _ssl _struct array binascii
cPickle cStringIO fcntl itertools math operator readline select strop
termios time
Now run "make" to build the target: hello

Now comes make:

ps at linux-s7f4:~/soft/Python-2.6.1/Tools/freeze> make
gcc -pthread  -Xlinker -export-dynamic config.o frozen.o
M_BaseHTTPServer.o M_FixTk.o M_SocketServer.o M_StringIO.o
M_Tkconstants.o M_Tkinter.o M_UserDict.o M___future__.o M___main__.o
M__abcoll.o M__threading_local.o M_abc.o M_base64.o M_bdb.o M_bisect.o
M_cmd.o M_codecs.o M_collections.o M_copy.o M_copy_reg.o
M_ctypes.oM_ctypes___endian.o M_ctypes__macholib.o
M_ctypes__macholib__dyld.o M_ctypes__macholib__dylib.o
M_ctypes__macholib__framework.o M_ctypes__util.o M_difflib.o M_dis.o
M_distutils.o M_distutils__dep_util.o M_distutils__errors.o
M_distutils__log.o M_distutils__spawn.o M_distutils__sysconfig.o
M_distutils__text_file.o M_distutils__util.o M_doctest.o
M_dummy_thread.o M_dummy_threading.o M_email.o M_email___parseaddr.o
M_email__base64mime.o M_email__charset.o M_email__encoders.o
M_email__errors.o M_email__feedparser.o M_email__message.o
M_email__mime.o M_email__parser.o M_email__quoprimime.o
M_email__utils.o M_encodings.o M_encodings__aliases.o M_fnmatch.o
M_formatter.o M_ftplib.o M_functools.o M_genericpath.o M_getopt.o
M_getpass.o M_gettext.o M_glob.o M_heapq.o M_httplib.o M_inspect.o
M_keyword.o M_linecache.o M_locale.o M_macurl2path.o M_mimetools.o
M_mimetypes.o M_ntpath.o M_nturl2path.o M_opcode.o M_optparse.o M_os.o
M_os2emxpath.o M_pdb.o M_pickle.o M_pkgutil.o M_posixpath.o M_pprint.o
M_py_compile.o M_pydoc.o M_pydoc_topics.o M_quopri.o M_random.o M_re.o
M_repr.oM_rfc822.o M_shlex.o M_site.o M_socket.o M_sre_compile.o
M_sre_constants.o M_sre_parse.o M_ssl.o M_stat.o M_string.o M_struct.o
M_subprocess.o M_tempfile.o M_textwrap.o M_threading.o M_token.o
M_tokenize.o M_traceback.o M_tty.o M_types.o M_unittest.o M_urllib.o
M_urlparse.o M_uu.o M_warnings.o M_webbrowser.o /home/ps/app/lib/
python2.6/config/libpython2.6.a   -lpthread -ldl  -lutil -lm  -o hello
/home/ps/app/lib/python2.6/config/libpython2.6.a(posixmodule.o): In
function `posix_tmpnam':
/home/ps/soft/Python-2.6.1/./Modules/posixmodule.c:7079: warning: the
use of `tmpnam_r' is dangerous, better use `mkstemp'
/home/ps/app/lib/python2.6/config/libpython2.6.a(posixmodule.o): In
function `posix_tempnam':
/home/ps/soft/Python-2.6.1/./Modules/posixmodule.c:7034: warning: the
use of `tempnam' is dangerous, betteruse `mkstemp'
config.o:(.data+0x28): undefined reference to `init_warnings'
collect2: ld returned 1 exit status
make: *** [hello] Error 1


I tested it on OpenSuSe 11.0 and Ubuntu 8.10 with the same results.

Did somebody experienced the same problem?

With Python 2.5.1 it works without problems.

Thanks in advance
Pablo


From gandalf at shopzeus.com  Tue Feb 24 06:22:41 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 12:22:41 +0100
Subject: try except question - serious foo bar question, and pulling my hair
	out :-)
Message-ID: <49A3D881.4070500@shopzeus.com>

Given this class below:

import Queue
import threading
from sorb.util.dumpexc import dumpexc
import waitablemixin


PREFETCH_SIZE = 10

class Feeder(threading.Thread,waitablemixin.WaitableMixin):
    def __init__(self,connection_manager):
        self.cm = connection_manager
        self.expired_asins = Queue.Queue()
        self.logger = self.cm.loggerfactory.get_logger("feeder")
        threading.Thread.__init__(self)

    def run(self):
        try:
            try:
                d = self.cm.create_dispatcher()
                try:
                    od_producer = d.locate('od_producer')
                    while not self.cm.stop_requested.isSet():
                        try:
                            items = od_producer.getsomeasins()
                            if items:
                                self.logger.info("Got %d items to 
process",len(items))
                                for item in items:
                                    self.expired_asins.put(item)
                                if self.expired_asins.qsize()>PREFETCH_SIZE:
                                    while 
(self.expired_asins.qsize()>PREFETCH_SIZE) and \
                                        not self.cm.stop_requested.isSet():
                                        self.logger.info(
                                            "%s (>%s) items in the 
queue, waiting...",
                                            self.expired_asins.qsize(),
                                            PREFETCH_SIZE
                                        )
                                        self.waitsome(1)
                            else:
                                self.logger.info("No more items to 
process, will wait 5 minutes.")
                                self.waitsome(5*60)
                        except Exception,e:
                            self.logger.error("Could not get asins: 
%s",dumpexc(e) )
                            self.logger.error("Will retry in 10 seconds.")
                            self.waitsome(10)
                finally:
                    d.close()
            except Exception,e:
                self.cm.stop_requested.set()
                self.logger.error(dumpexc(e))
        finally:
            self.logger.error("Feeder stopped. stop_requested = 
%s",str(self.cm.stop_requested.isSet()))
        
            
How in the hell can I get the following log output:

2009-02-24 11:42:14,696 INFO .feeder Got 5 items to process
2009-02-24 11:42:14,732 INFO .feeder Got 5 items to process
2009-02-24 11:42:14,733 INFO .feeder 15 (>10) items in the queue, waiting...
2009-02-24 11:42:15,740 INFO .feeder 15 (>10) items in the queue, waiting...
2009-02-24 11:42:16,965 ERROR .feeder Feeder stopped. stop_requested = False

It seems impossible to me. The while loop should only exit if 
stop_requested becomes set, OR if an exception is raised. However, all 
exceptions are cought and logged. But there are no exceptions logged. 
And stop_requested is NOT SET. (see the last line in the log).

What is happening here?


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 07:04:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 10:04:22 -0200
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
References: <49A3D881.4070500@shopzeus.com>
Message-ID: <op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 09:22:41 -0200, Laszlo Nagy <gandalf at shopzeus.com>  
escribi?:

> Given this class below:

[code removed]

> It seems impossible to me. The while loop should only exit if  
> stop_requested becomes set, OR if an exception is raised. However, all  
> exceptions are cought and logged. But there are no exceptions logged.  
> And stop_requested is NOT SET. (see the last line in the log).

I assume stop_requested is an Event object. Maybe other thread cleared it?

-- 
Gabriel Genellina



From gandalf at shopzeus.com  Tue Feb 24 07:25:26 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 13:25:26 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A3E736.2020702@shopzeus.com>


>
> I assume stop_requested is an Event object. Maybe other thread cleared 
> it?
>
It was never set! -> nothing can clear it.


From gandalf at shopzeus.com  Tue Feb 24 07:34:11 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 13:34:11 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <49A3E736.2020702@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com>
Message-ID: <49A3E943.3010405@shopzeus.com>


>>
>> I assume stop_requested is an Event object. Maybe other thread 
>> cleared it?
>>
> It was never set! -> nothing can clear it.
In theory, it could be that a thread sets the event object. E.g.:

#1. other thread calls stop_requested.set()
#2. "while not self.stop_requested.isSet()" -- loop exists
#3. other thread calls stop_requested.clear()
#4. called this: self.logger.error("Feeder stopped. stop_requested = 
%s",str(self.cm.stop_requested.isSet()))

However, this cannot happen. This application is running multiple 
threads (10+) and every thread monitors the global "stop_requested" 
flag. If there was an unexpected error in the service, 
stop_requested.set() is called. It will stop all threads and exit the 
process. stop_requested.clear() is NEVER called, so the while loop 
should have not been ended. So what is happening here? It drives me crazy.



From patrick.oloughlin at gmail.com  Tue Feb 24 07:41:30 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Tue, 24 Feb 2009 12:41:30 +0000
Subject: "Byte" type?
In-Reply-To: <49a36e1c$0$1586$742ec2ed@news.sonic.net>
References: <4997aa38$0$1678$742ec2ed@news.sonic.net>
	<499859e2$0$1618$742ec2ed@news.sonic.net>
	<mailman.9587.1234730192.3487.python-list@python.org>
	<499f8a8e$0$1588$742ec2ed@news.sonic.net>
	<mailman.414.1235228520.11746.python-list@python.org>
	<49a03081$0$1599$742ec2ed@news.sonic.net> <gnpee3$r69$1@ger.gmane.org>
	<mailman.439.1235292478.11746.python-list@python.org>
	<49A19B92.2080102@v.loewis.de>
	<49a36e1c$0$1586$742ec2ed@news.sonic.net>
Message-ID: <cc34a9320902240441r72582fdfr93a29497a55909ef@mail.gmail.com>

2009/2/24 John Nagle <nagle at animats.com>:
> Martin v. L?wis wrote:
>>>>
>>>> Please don't call something dumb that you don't fully understand. It's
>>>> offenses the people who have spent lots of time developing Python --
>>>> personal, unpaid and voluntary time!
>
> ? Some of the people involved are on Google's payroll.

Uh, what does that have to do with anything?
It would only be relevant if you are saying that Google is paying them
to do the work (so not just "on their payroll").

More importantly, it's also only relevant if ALL the people
contributing are being paid by Google to do the work, which I'm pretty
sure is not the case.

There are people are spending lots of personal, unpaid and voluntary
time developing Python.

Paddy
-- 
"Ray, when someone asks you if you're a god, you say YES!"


From woodygar at sky.com  Tue Feb 24 07:54:28 2009
From: woodygar at sky.com (Gary Wood)
Date: Tue, 24 Feb 2009 12:54:28 -0000
Subject: Newby - is this what they are looking for ?? and is their a better a
	way
Message-ID: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>

''' program. 
1.What type of data will the input be? What type of data will the output be? 
2.Get the phrase from the user. 
3.Convert to upper case. 
4.Divide the phrase into words. 
5.Initialize a new empty list, letters. 
6.Get the first letter of each word. 
7.Append the first letter to the list letters. 
8.Join the letters together, with no space between them. 
9.Print the acronym.
Which of these steps is in a loop? What for statement controls this loop? '''

line = input('enter a phrase')
lines = line.upper()
seq = lines.split()
for i in seq:
    word = (i[0])
    print(word, end='')
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From clp2 at rebertia.com  Tue Feb 24 08:06:14 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 05:06:14 -0800
Subject: Newby - is this what they are looking for ?? and is their a 
	better a way
In-Reply-To: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
Message-ID: <50697b2c0902240506nffd6afana480585cdf744bdf@mail.gmail.com>

On Tue, Feb 24, 2009 at 4:54 AM, Gary Wood <woodygar at sky.com> wrote:
> ''' program.
> 1.What type of data will the input be? What type of data will the output be?
> 2.Get the phrase from the user.
> 3.Convert to upper case.
> 4.Divide the phrase into words.
> 5.Initialize a new empty list, letters.
> 6.Get the first letter of each word.
> 7.Append the first letter to the list letters.
> 8.Join the letters together, with no space between them.
> 9.Print the acronym.

You're not doing 5 or 7-9 right. Where's the `letters` list they asked for?

> Which of these steps is in a loop? What for statement controls this loop?
> '''
>
> line = input('enter a phrase')
> lines = line.upper()
> seq = lines.split()
> for i in seq:
> ??? word = (i[0])
> ??? print(word, end='')

Hint: `print` shouldn't be used inside the loop at all.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gandalf at shopzeus.com  Tue Feb 24 08:09:44 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 14:09:44 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
In-Reply-To: <49A3D881.4070500@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>
Message-ID: <49A3F198.4030208@shopzeus.com>


>
> It seems impossible to me. The while loop should only exit if 
> stop_requested becomes set, OR if an exception is raised. However, all 
> exceptions are cought and logged. But there are no exceptions logged. 
> And stop_requested is NOT SET. (see the last line in the log).
>
> What is happening here?

It was a bad assumption. Not all exceptions are subclasses of 
"Exception". In this case, an inner call raised SystemExit(0). So be 
aware. Don't think that this will catch all exceptions:

try:
    ???
except Exception,e:
   do_with(e)


Use this instead:

import sys
try:
    ???
except:
   e = sys.exc_value
   do_with(e)


Thanks,

   Laszlo



From steve at holdenweb.com  Tue Feb 24 08:17:28 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 08:17:28 -0500
Subject: How to read columns in python
In-Reply-To: <de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>
References: <de8b174b0902232241p5d061753wd8119e5819b305b2@mail.gmail.com>	<50697b2c0902232248q7f704629v74b8125262c206f4@mail.gmail.com>
	<de8b174b0902232308g24bd685eod5f2ad9bb31b02ec@mail.gmail.com>
Message-ID: <go0s18$klf$1@ger.gmane.org>

Dhananjay wrote:
> Well,
> 
> The three columns are tab separated and there are 200 such rows having
> these 3 columns in the file.
> 
> First two columns are x and y coordinates and third column is the
> corresponding value.
> 
> I want to read this file as a matrix in which column1 correspond to
> row,  column2 corresponds to columns(in matrix) and column3 corresponds
> to value in the matrix.
> 
> 
> 
> -- Dhananjay
> 
> 
> 
> On Tue, Feb 24, 2009 at 12:18 PM, Chris Rebert <clp2 at rebertia.com
> <mailto:clp2 at rebertia.com>> wrote:
> 
>     On Mon, Feb 23, 2009 at 10:41 PM, Dhananjay
>     <dhananjay.c.joshi at gmail.com <mailto:dhananjay.c.joshi at gmail.com>>
>     wrote:
>     > I am bit new to python and programming and this might be a basic
>     question:
>     >
>     > I have a file containing 3 columns.
> 
>     Your question is much too vague to answer. What defines a "column" for
>     you? Tab-separated, comma-separated, or something else altogether?
> 
Try something like

f = open("datafile.txt", 'r')
x = []; y = []; val = []
for line in f:
    xx, yy, vv = line.split()
    x.append(float(xx))
    y.append(float(yy))
    val.append(float(vv))

Of course this is only one way to represent the data - as vectors of x,
y and val. If you just wanted a list of the data triples then you could
have written

f = open("datafile.txt", 'r')
values = []
for line in f:
   x, y, v = line.split()
   values.append(float(x), float(y), float(v))

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From stefan_ml at behnel.de  Tue Feb 24 08:22:25 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 24 Feb 2009 14:22:25 +0100
Subject: Python C-API Object Allocation
In-Reply-To: <mailman.564.1235421673.11746.python-list@python.org>
References: <BLU125-W522D6E30C434DF30A699A495B00@phx.gbl>
	<mailman.564.1235421673.11746.python-list@python.org>
Message-ID: <49a3f491$0$30238$9b4e6d93@newsspool1.arcor-online.net>

> On Feb 21, 2009, at 10:01 AM, William Newbery wrote:
>> Ive been learning the C-API lately so I can write python extensions
>> for some of my c++ stuff.

First thing that comes to (my) mind is that you probably do not want to
write code against the bare C-API. Instead, give Cython a try.

http://cython.org

Stefan


From girish.cfc at gmail.com  Tue Feb 24 08:29:21 2009
From: girish.cfc at gmail.com (Girish)
Date: Tue, 24 Feb 2009 05:29:21 -0800 (PST)
Subject: Extract CDATA Node
Message-ID: <ba1ce25b-90a2-4670-a5c5-0370b0e9e09f@l37g2000vba.googlegroups.com>

How do I extract CDATA node in Python? I'm using dom.minidom as
follows:-

from xml.dom.minidom import Document

class XMLDocument():

    def __init__(self):
        self.doc  = Document()

    def parseString(self, d):
        self.doc = parseString(_encode(d))
        return self

#Create instance of XMLDocument
doc = XMLDocument()
doc.parseString(open(os.curdir + '\\XML\\1.xml', 'r').read())
.....

Please help me out.

Thanks,
Girish


From exarkun at divmod.com  Tue Feb 24 08:38:37 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Tue, 24 Feb 2009 08:38:37 -0500
Subject: Extract CDATA Node
In-Reply-To: <ba1ce25b-90a2-4670-a5c5-0370b0e9e09f@l37g2000vba.googlegroups.com>
Message-ID: <20090224133837.12853.1184111844.divmod.quotient.13470@henry.divmod.com>

On Tue, 24 Feb 2009 05:29:21 -0800 (PST), Girish <girish.cfc at gmail.com> wrote:
>How do I extract CDATA node in Python? I'm using dom.minidom as
>follows:-
>
>from xml.dom.minidom import Document
>
>class XMLDocument():
>
>    def __init__(self):
>        self.doc  = Document()
>
>    def parseString(self, d):
>        self.doc = parseString(_encode(d))
>        return self
>
>#Create instance of XMLDocument
>doc = XMLDocument()
>doc.parseString(open(os.curdir + '\\XML\\1.xml', 'r').read())
>.....
>
>Please help me out.

Here's one approach.

    from xml.dom.minidom import parse
    doc = parse(file('XML/1.xml'))
    cdata = []
    elements = [doc.documentElement]
    while elements:
        e = elements.pop(0)
        if e.nodeType == doc.TEXT_NODE:
            cdata.append(e.data)
        elif e.nodeType == doc.ELEMENT_NODE:
            elements[:0] = e.childNodes
    print cdata

I bet there are simpler ways, though, based on other XML libraries.

Jean-Paul


From steve at holdenweb.com  Tue Feb 24 09:06:05 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 09:06:05 -0500
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
In-Reply-To: <49A3E943.3010405@shopzeus.com>
References: <49A3D881.4070500@shopzeus.com>	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>	<49A3E736.2020702@shopzeus.com>
	<49A3E943.3010405@shopzeus.com>
Message-ID: <go0usd$vc0$1@ger.gmane.org>

Laszlo Nagy wrote:
> 
>>>
>>> I assume stop_requested is an Event object. Maybe other thread
>>> cleared it?
>>>
>> It was never set! -> nothing can clear it.
> In theory, it could be that a thread sets the event object. E.g.:
> 
> #1. other thread calls stop_requested.set()
> #2. "while not self.stop_requested.isSet()" -- loop exists
> #3. other thread calls stop_requested.clear()
> #4. called this: self.logger.error("Feeder stopped. stop_requested =
> %s",str(self.cm.stop_requested.isSet()))
> 
> However, this cannot happen. This application is running multiple
> threads (10+) and every thread monitors the global "stop_requested"
> flag. If there was an unexpected error in the service,
> stop_requested.set() is called. It will stop all threads and exit the
> process. stop_requested.clear() is NEVER called, so the while loop
> should have not been ended. So what is happening here? It drives me crazy.
> 
Time to get a stuffed toy and go through your code, explaining to the
toy exactly why your code is right and nothing can go wrong. With luck,
within half an hour you will realize what you are doing wrong ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From digitig at gmail.com  Tue Feb 24 09:19:56 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 14:19:56 +0000
Subject: Reference or Value?
In-Reply-To: <01b3c619$0$23707$c3e8da3@news.astraweb.com>
References: <gnrq68$g9h$1@news.LF.net>
	<mailman.464.1235320654.11746.python-list@python.org>
	<pan.2009.02.23.04.09.17@REMOVE.THIS.cybersource.com.au>
	<mailman.513.1235387683.11746.python-list@python.org>
	<pan.2009.02.24.04.47.59@REMOVE.THIS.cybersource.com.au>
	<mailman.647.1235465046.11746.python-list@python.org>
	<01b3c619$0$23707$c3e8da3@news.astraweb.com>
Message-ID: <aee48b3c0902240619tc3d75cbof7047125060e7f04@mail.gmail.com>

2009/2/24 Steven D'Aprano <steve at pearwood.info>:

> If you look at this Wikipedia page:
>
> http://en.wikipedia.org/wiki/Evaluation_strategy
>
> you should be able to count no fewer than thirteen different terms for
> different evaluation strategies, and "call-by-value" itself is described as
> a family of strategies.

And that call by sharing is a member of that family even though the
behaviour is (as I understand it) exactly what you would get if you
pass an object by ^reference^ in C++. Wikipedia can be a double-edged
sword ;-).

I think the problem is that "Call by value" and "Call by reference"
are terms that pre-date object orientation, and don't cope well with
obect-oriented languages in general, not just with Python. That Java
programmers get by thinking the mechanism is called "call by value",
C++ programmers get by thinking the same mechanism is called "call by
reference" and Python programmers get by thinking the same mechanism
is called "call by sharing" suggests that the terms are no longer
helpful. Programmers in one language simply can't know what the
terminology means when applied to another language without learning
the behaviour in that other language before learning the terminology.

That means that Torsten's original question probably wasn't the one he
wanted to ask, and wasn't a useful one. The useful question is "what
is Python's parameter passing *behaviour^",
with a possible supplementary "what do they call that behaviour *in
the Python community*", recognising that if they asked "what is Java's
parameter passing *behaviour^",
with the supplementary "what do they call that behaviour *in the Java
community*" they would get much the same answer for the first question
(immutability is handled differently, I think, but it's there) but a
totally different answer to the second.

-- 
Tim Rowe


From bnsilinux at gmail.com  Tue Feb 24 09:20:48 2009
From: bnsilinux at gmail.com (Ben)
Date: Tue, 24 Feb 2009 06:20:48 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
Message-ID: <7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>

On Feb 23, 2:31?pm, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?In My S-Lag Project called, SLAG, I have some function keys that get
> > ?mapped back to S-lang internal functions.
>
> > ?My SLAG project works pretty much like Python (as does the S-Lang).
> > ?You write a S-lang script
> > ?that "imports" your extension. module - and all this gets run by the
> > ?shell/interpreter.
>
> > ?I allow function keys to be mapped back internal function(s) inside of
> > ?the controlling program.
>
> > ?My question is which Python C api Do I need to this with ?
>
> Do you mean like this?
>
> ?http://code.google.com/p/python-slang
>
> Not sure how well maintained it is though.
>
> > Do I need to worry about my reference counting since the Python
> > Program is in essence calling a function in itself?
>
> I'm not sure I understand you here, but in general you don't need to
> worry about reference counting in Python - it all happens behind the
> scenes. ?If you are writing a python extension in C then you do need
> to worry about reference counting - a lot!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

No, It uses the the S-lang for video, and input control. However, SLAG
is more of an abstract layer on top of that.

It has a Structures that contains menus and screens (menumodule /
screenmodule). One LOADS them up with parameters.
such as creating a new menu is like:

OpenMenu( Company name, SubSystem, this program name, mode, bottom
status display)   - Create initial menu structure
Addtomenu(Menu Block Set name, DISPLAY line, ID, type of program,
password ID )  - add to / update MENU blocks.
runMenu()   - Displays the whole create menu structure.

The Menu structure is done in pull downs and scrollable blocks in a
TUI (text User Interface) and using the
S-lang screen library is fully mouseable.

The screen module works mych the same way, but with the abiltity to
open and close and
work within "Sub Screens".


For those who do not know, S-lang is a interpreted language much like
Python. However, there
is s direth of library modules. The original S-lang started out as
library of screen of keyboard
modules, but has been expanded

My SLAG project does not care in reality WHICH or what language, it is
simply handling menu and
screen control.

Hope this helps ...


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 09:25:50 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 12:25:50 -0200
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
	<73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>
Message-ID: <op.upu01cwmx6zn5v@gabriel.sleipnir-bsas>

En Mon, 23 Feb 2009 05:51:27 -0200, Kom2 <kom2 at centrum.cz> escribi?:

> On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
>> Kom2 wrote:
>> > Hello,
>> > I'm trying to convert my project from python 2.5 to python 3.0 and I
>> > have the following problem. My project is PYD library written in C++.
>> > So I have this PyInit_ModuleName function containing PyModule_Create
>> > call and this function also call some script with declarations:
>>
>> > ? ?PyObject* m;
>>
>> > ? ?m = PyModule_Create(&PyVRDAModule);
>> > ? ?if (m == NULL) {
>> > ? ? ? return NULL;
>> > ? ?}
>> > ? ?PyObject *d, *v;
>> > ? ?d = PyModule_GetDict(m);
>> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
>> > d, NULL);
>> > ? ?......
>>
>> > txtPyPredefinedConstants is string with this content:
>>
>> > class CursorMoveType:
>> > ? ?First = 0
>> > ? ?Last = 1
>> > ? ?Next = 2
>> > ? ?Previous = 3
>> > ? ?Bookmark = 4
>> > ? ?NewRecord = 5
>>
>> > In Python 2.5 everything works fine, now in python3.0
>> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
>> > found".

__build_class__ is a (hidden?) function in the builtins module.
Your module isn't completely created yet, it lacks the __builtins__  
attribute, so you can't execute any Python code that calls a builtin  
function. In 2.5 the class statement was a lot simpler, but in 3.0 it  
requires an auxiliary function (implemented as builtins.__build_class__)
You may try setting __builtins__ to the current builtins  
(PyEval_GetBuiltins) before executing Python code.
Or, if those 7 lines are all you need, you may just write the equivalent C  
code.

-- 
Gabriel Genellina



From chrysn at fsfe.org  Tue Feb 24 09:27:19 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Tue, 24 Feb 2009 15:27:19 +0100
Subject: variables bound in moudules are None when module is not completely
	imported
Message-ID: <20090224142719.GA27379@hephaistos.amsuess.com>

when a module being loaded is interrupted by an exception, code blocks
that have the module's scope in their environment will later evaluate
variables bound to that module to None, instead of preserving that scope
(because it is still referenced somewhere) or raising a NameError (for
which i see no reason, but which would still be better than silently
returning None).

this can happen, for example, when one tries to join different programs
in one main loop by having the modules first hook up to events and then
terminating the subprograms by replacing the call to the main loop with
an exception raiser.

attached, there is a tarball with two similar examples, one
demonstrating that with functions instead of modules (this behaves as
expected; ./function/), the other showing that when a module's block is
terminated, the remaining variables are set to None (./module/); both
can be run by calling `python main.py` in the respective directory.

* is this a bug in the pythin implementation? (i've tested it both with
  2.5 and with 3.0b2)
* if yes, is it identical to [1748015]? (i suppose it is, but lacking
  experience with pdb i am not sure)
* can / will this be fixed?
* is there a workaround?
    * especially, is there a workaround that works w/o rewriting the
      modules that raise the exceptions? (otherwise, wrapping all the
      stuff called in the __name__=="__main__" wrapper into a main()
      function and then calling that would trivially solve that)

answers to any of these questions would be very much appreciated

regards
chrysn

[1748015] http://bugs.python.org/issue1748015

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From gagsl-py2 at yahoo.com.ar  Tue Feb 24 09:52:14 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 24 Feb 2009 12:52:14 -0200
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
References: <49A3D881.4070500@shopzeus.com> <49A3F198.4030208@shopzeus.com>
Message-ID: <op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 11:09:44 -0200, Laszlo Nagy <gandalf at shopzeus.com>  
escribi?:

>> It seems impossible to me. The while loop should only exit if  
>> stop_requested becomes set, OR if an exception is raised. However, all  
>> exceptions are cought and logged. But there are no exceptions logged.  
>> And stop_requested is NOT SET. (see the last line in the log).
>>
>> What is happening here?
>
> It was a bad assumption. Not all exceptions are subclasses of  
> "Exception". In this case, an inner call raised SystemExit(0).

Glad to see you finally found what was happening!

> So be aware. Don't think that this will catch all exceptions:
>
> try:
>     ???
> except Exception,e:
>    do_with(e)
>
>
> Use this instead:
>
> import sys
> try:
>     ???
> except:
>    e = sys.exc_value
>    do_with(e)

Only at the outermost block on your code, if ever... The fact that some  
exceptions don't inherit from Exception is on purpose -- usually you  
*dont* want to catch (and swallow) SystemExit (nor KeyboardInterrupt, and  
a few more I think)

-- 
Gabriel Genellina



From gabriel.rossetti at arimaz.com  Tue Feb 24 09:56:59 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 24 Feb 2009 15:56:59 +0100
Subject: shared lib from python code?
In-Reply-To: <89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
References: <49A27608.3050403@arimaz.com> <49A28BD6.9040701@arimaz.com>
	<89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
Message-ID: <49A40ABB.6090502@arimaz.com>

andrew cooke wrote:
> Gabriel Rossetti wrote:
>   
>> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I
>> don' t want to share code as in have multiple processes access a
>> variable and have the same value, like it is done in threads, what I
>> want is to not have n copies of the code (classes, functions, etc)
>> loaded by n python interpreters. When you load Apache for instance, it
>> runs n processes but loads only one copy of parts of it's code (so/dll),
>> that's what I want to do. In C/C++ I would write a shared-lib (so/dll),
>> so once the system has loaded it, it doesn' t re-load it when another
>> process needs it.
>>     
>
> i think i understand what you want.  the problem is that the kind of
> language that python is really doesn't work well with that kind of
> approach.  this is (and i may be wrong - i've not really thought much
> about this before) largely because python places a very strong emphasis on
> late binding.  that means that everything is very flexible - all kinds of
> things can be changed "under the hood".  and that means that it is very
> difficult to share things safely because almost any solution would end up
> doing what you don't want (sharing variables, like with threads (even
> though they are very deeply buried variables)) rather than what you do
> want (just sharing the static part of the code to save space).
>
> another way to see this is to see the connection with security.  this is
> the flip side of your case - because things are so flexible it is very
> hard to run some python code in a "sandbox" in a larger python program. 
> there's some discussion on the dev group at the moment and it looks like
> the solution is to only use function closures.  but even that doesn't work
> without some patches that remove certain ways to dynamically alter the
> code base.
>
> andrew
>
>   
Ok, I see, thank you. I thought this was possible since I have used 
*.pyd files before and from what I had read they were dynamic library 
files. I guess they must be written in C/C++ then. Thank you for the 
explanation.

Gabriel


From gabriel.rossetti at arimaz.com  Tue Feb 24 09:58:54 2009
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Tue, 24 Feb 2009 15:58:54 +0100
Subject: shared lib from python code?
In-Reply-To: <Xns9BBB84727E289duncanbooth@127.0.0.1>
References: <49A27608.3050403@arimaz.com>	<mailman.514.1235389443.11746.python-list@python.org>
	<Xns9BBB84727E289duncanbooth@127.0.0.1>
Message-ID: <49A40B2E.2010601@arimaz.com>

Duncan Booth wrote:
> Gabriel Rossetti <gabriel.rossetti at arimaz.com> wrote:
>
>   
>> Ok, maybe I mis-stated my problem (or mis-understood your answers).. I 
>> don' t want to share code as in have multiple processes access a 
>> variable and have the same value, like it is done in threads, what I 
>> want is to not have n copies of the code (classes, functions, etc) 
>> loaded by n python interpreters. When you load Apache for instance, it 
>> runs n processes but loads only one copy of parts of it's code (so/dll), 
>> that's what I want to do. In C/C++ I would write a shared-lib (so/dll), 
>> so once the system has loaded it, it doesn' t re-load it when another 
>> process needs it.
>>
>>     
>
> It doesn't matter how you restate it, the answer is still the one Gabriel 
> Genellina gave you: Python code objects are not shared between processes.
>
>   
Ok, I had though that he had misunderstood me.
> Code objects are immutable, but they are still objects like everything else 
> in Python. That means they are reference counted and discarded when no 
> longer referenced.
>
> To share code objects between different processes you would have to change 
> the reference counting mechanism so it was either safe across multiple 
> processes or didn't reference count shared code objects (but still ref 
> counted non-shared objects).
>
> The actual code is just stored in a string, so perhaps you could share 
> those strings between processes: just executing the code doesn't change the 
> string's refcount (whereas it does change the function and the code 
> objects' counts). You could probably make something work simply by editing 
> the code constructor to move the code into shared memory and using some 
> other mechanism to control the shared memory storage.
>
>   
Ok, thanks for the explanation.
> C extension libraries on the other hand may be shared.
>
>   
Ok, so pyd files must be C extensions then.

Thanks


From nick_keighley_nospam at hotmail.com  Tue Feb 24 10:00:41 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Tue, 24 Feb 2009 07:00:41 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
Message-ID: <ea052d08-0621-4281-ad47-f6705f7e289d@f24g2000vbf.googlegroups.com>

On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:
> comp.lang.lisp,comp.lang.scheme,comp.lang.functional,comp.lang.python,comp.?lang.ruby
>
> Here's a interesting toy problem posted by Drew Krause to
> comp.lang.lisp:
>
> ------------------------
> On Jan 16, 2:29 pm, Drew Krause wrote [paraphrased a bit]:
>
> OK, I want to create a nested list in Lisp (always of only integers)
> from a text file, such that each line in the text file would be
> represented as a sublist in the 'imported' list.
>
> example of a file's content
>
> 3 10 2
> 4 1
> 11 18
>
> example of programing behavior
> (make-list-from-text "blob.txt") => ((3 10 2) (4 1) (11 18))
>
> -----------------
> Here's a emacs lisp version:
>
> (defun read-lines (file)
>   "Return a list of lines in FILE."
>   (with-temp-buffer
>     (insert-file-contents file)
>     (split-string
>      (buffer-substring-no-properties 1 (point-max)) "\n" t)
>     )
>   )
>
> (defvar mylist '() "result list" )
> (setq mylist '()) ; init in case eval'd again
>
> (mapc
>  (lambda (x) (setq mylist
>                    (cons (split-string x " ") mylist )) )
>  (read-lines "xxblob.txt")
>  )
>
> The above coding style is a typical maintainable elisp.
>
> In a show-off context, it can be reduced to by about 50%, but still
> far verbose than ruby or say perl (which is 1 or 2 lines. (python
> would be 3 or 5)).
>
> Note that the result element is string, not numbers. There's no easy
> way to convert them on the fly. 3 or so more lines will be needed to
> do that.
>
> The ?read-lines? function really should be a built-in part of elisp.
> It is not so mostly because emacs people have drawn themselves into a
> elitist corner, closing off to the outside world. (i am sending a
> suggestion to the official emacs dev list on adding read-line now.)

scheme:

(define (read-line port)
    (define (rec-read-line port line)
        (define next-char (peek-char port))
        (define number #f)
        (cond ((eof-object? next-char) '())
              ((char=? next-char #\newline) (read-char port) line)
              ((char-numeric? next-char)
                   (set! number (read port))
                   (cons number (rec-read-line port line)))
              ((char=? next-char #\space)
                   (read-char port)
                   (rec-read-line port line))
              (else (error (string-append "bad character \""
                              (string next-char) "\"")))
    ))

    (rec-read-line port '())
)

(define (make-int-list port)
    (define line (read-line port))
    (if (null? line)
        '()
        (cons line (make-int-list port))))

(define (make-list-from-text file)
    (make-int-list (open-input-file file)))



> -----------------
>
> w_a_x_... at yahoo.com gave a ruby solution:
>
>   IO.readlines("blob.txt").map{|line| line.split }
>
> augumented by Jilliam James for result to be numbers:
>
>   IO.readlines("blob.txt").map{|line| line.split.map{|s| s.to_i }}
>
> Very beautiful.
>
> -------------------
>
> That's really the beauty of Ruby.
>
> This problem and ruby code illustrates 2 fundamental problems of lisp,
> namely, the cons problem, and the nested syntax pain. Both of which
> are practically unfixable.
>
> The lisp's cons fundamentally makes nested list a pain to work with.
> Lisp's nested syntax makes functional sequencing cumbersome.
>
> In the ruby code, its post-fix sequential notation (as a side effect
> of its OOP notation) brings out the beauty of functional sequencing
> paradigm (sometimes known as functional chain, sequencing, filtering,
> unix piping).
>
> its list, like all modern high level langs such as perl, php, python,
> javascript, don't have the lisp's cons problem. The cons destroys the
> usability of lists up-front, untill you have some at least 2 full-time
> years of coding lisp to utilize cons properly. (and even after that,
> it is still a pain to work with, and all you gain is a bit of speed
> optimization in rare cases that requires largish data, most of which
> has better solutions such as a database.)
>
> Both of these problems i've published articles on.
>
> For more detail on the cons problem, see
> the section ?The Cons Business? at
>
> ? Fundamental Problems of Lisp
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
>
> For more detail on the nested syntax problem for function chaining,
> see
> the section ?How Purely Nested Notation Limits The Language's Utility?
> at:
>
> ? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
> Nested Notations
>  http://xahlee.org/UnixResource_dir/writ/notations.html


From digitig at gmail.com  Tue Feb 24 10:11:46 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 15:11:46 +0000
Subject: Newby - is this what they are looking for ?? and is their a 
	better a way
In-Reply-To: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
Message-ID: <aee48b3c0902240711g552bb50bp9d34ae178ce1ab94@mail.gmail.com>

You're doing well so far. As Chris has said, you need to read the
later part of the question more carefully. A couple of other things:

1. 'input' might not be the best way to get the phrase, because the
user will have to put the phrase in quotes or the program will
(probably) crash. Have a look at raw_input.

2. A cosmetic thing. Your users will be happier if you put a space
after 'enter a phrase'

3. A "better way" might not be a better way for you. There's a very
Pythonic way of doing this using something called list comprehensions,
but they're almost certainly not what your tutor wants because they're
rather more advanced than the level you're working at. If it wasn't
for the requirement to put the acronym into the variable "letters",
the whole task could be done in one Python statement. Don't try that.
Keep it simple, the way you have been so far.

4. If you want to be a wise guy, ask your tutor why he/she got you to
convert the whole phrase to upper case, wasting a whole pile of
character conversion operations under the hood, because it's only the
acronym that needs to be converted :-)

-- 
Tim Rowe


From tracyde at gmail.com  Tue Feb 24 10:19:07 2009
From: tracyde at gmail.com (Derek Tracy)
Date: Tue, 24 Feb 2009 10:19:07 -0500
Subject: Unix Change Passwd Python CGI
Message-ID: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>

I am using python version 2.5.1 and need to create a python cgi application
to allow a user to change their unix password.

Apache is running on the same system that needs the password changed.  I
need to keep security high and can not install additional modules at this
time.

I just need a general direction to start looking, and I do not have expect
installed on the system.

Any ideas would be wonderful!

R/S --
---------------------------------
Derek Tracy
tracyde at gmail.com
---------------------------------
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From invalid at invalid  Tue Feb 24 10:38:11 2009
From: invalid at invalid (Grant Edwards)
Date: Tue, 24 Feb 2009 09:38:11 -0600
Subject: try except question - serious foo bar question, and pulling my
	hair out :-)
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com> <49A3E943.3010405@shopzeus.com>
	<mailman.664.1235484376.11746.python-list@python.org>
Message-ID: <6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>

On 2009-02-24, Steve Holden <steve at holdenweb.com> wrote:

>> However, this cannot happen. This application is running
>> multiple threads (10+) and every thread monitors the global
>> "stop_requested" flag. If there was an unexpected error in the
>> service, stop_requested.set() is called. It will stop all
>> threads and exit the process. stop_requested.clear() is NEVER
>> called, so the while loop should have not been ended. So what
>> is happening here? It drives me crazy.
>
> Time to get a stuffed toy and go through your code, explaining
> to the toy exactly why your code is right and nothing can go
> wrong. With luck, within half an hour you will realize what
> you are doing wrong ...

It works with a person as well as stuffed toys -- but trying to
order a person on the internet gets you in a lot more trouble.
It's also a little more embarassing when you realize your
mistake in front of a person.  OTOH, sometimes a person will
ask an enlightening question; but, sometimes they just make
unhelpfull wisecracks.  It's a tough choice.

-- 
Grant Edwards                   grante             Yow! OVER the underpass!
                                  at               UNDER the overpass!
                               visi.com            Around the FUTURE and
                                                   BEYOND REPAIR!!


From gandalf at shopzeus.com  Tue Feb 24 10:45:13 2009
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Tue, 24 Feb 2009 16:45:13 +0100
Subject: try except question - serious foo bar question, and pulling my
	hair	out :-)
In-Reply-To: <op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>
References: <49A3D881.4070500@shopzeus.com> <49A3F198.4030208@shopzeus.com>
	<op.upu19c2fx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A41609.6090904@shopzeus.com>


>>
>> Use this instead:
>>
>> import sys
>> try:
>>     ???
>> except:
>>    e = sys.exc_value
>>    do_with(e)
>
> Only at the outermost block on your code, if ever... The fact that 
> some exceptions don't inherit from Exception is on purpose -- usually 
> you *dont* want to catch (and swallow) SystemExit (nor 
> KeyboardInterrupt, and a few more I think)
>

Yes, this was at the outermost block of my thread's run method.

SystemExit exception did not generate an "exception in Thread-32" type 
traceback on stderr because for Python, it seemed to be a "normal" exit 
of the thread. So I wrote an except block, to see why the thread has 
been stopping. In this case, catching SystemExit was desired. The 
problem was in my mind: I thought that "except Exception,e:" will catch 
everything.

The solution was to replace "raise SystemExit(0)" with "raise 
TransportClosedException()" in another class.

Thanks again,

   Laszlo



From __peter__ at web.de  Tue Feb 24 10:50:17 2009
From: __peter__ at web.de (Peter Otten)
Date: Tue, 24 Feb 2009 16:50:17 +0100
Subject: Newby - is this what they are looking for ?? and is their a
	better a way
References: <8C52BE9109254380A7EB5B082D23DB6B@Woodygar>
	<mailman.671.1235488311.11746.python-list@python.org>
Message-ID: <go14vo$ptv$02$1@news.t-online.com>

Tim Rowe wrote:

> 1. 'input' might not be the best way to get the phrase, because the
> user will have to put the phrase in quotes or the program will
> (probably) crash. Have a look at raw_input.

Gary is using Python 3 where input() works like the raw_input() of yore.
The giveaway is

> print(word, end='')

Peter


From R.Brodie at rl.ac.uk  Tue Feb 24 11:04:54 2009
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Tue, 24 Feb 2009 16:04:54 -0000
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com><gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com><gnv6vs$bm7$1@ger.gmane.org>
	<mailman.615.1235436896.11746.python-list@python.org>
Message-ID: <go15r7$3fp$1@south.jnrs.ja.net>


"Rhodri James" <rhodri at wildebst.demon.co.uk> wrote in message 
news:mailman.615.1235436896.11746.python-list at python.org...

> A souq is a bazaar :-)

> Maybe I've just read too much arabic-themed fiction, but I was surprised not
> to find the word in my trusty Chambers.

Try under 'souk'. Transliterating to the Roman 'q' seems to have become
popular relatively recently. 




From kyosohma at gmail.com  Tue Feb 24 11:05:06 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 24 Feb 2009 08:05:06 -0800 (PST)
Subject: March 2, 2009 Pyowa Meeting
Message-ID: <02f0bb8f-4357-43ea-8f32-da3835ea3c43@f11g2000vbf.googlegroups.com>

Hi,

Just a quick note to say that our next Pyowa (Python Users Group of
Iowa) meeting will be next Monday, March 2nd from 7-9 p.m. We will be
in our original location at the Marshall County Sheriff's Office, 2369
Jessup Ave, Marshalltown, IA. Remember, it's technically NOT in
Marshalltown at all. It's actually about 7 miles to the West of
Marshalltown. Keep an eye on our website (www.pyowa.org) for updates
and/or cancellations should the weather turn bad.

We are currently going to have a presentation featuring real-life
programs/scripts to give our members an idea of what Python is used
for on a day-to-day basis. We'll probably open it up to the audience
to see if they have anything to add. We are also hoping to have a
presentation on some basic GIS scripts, but this is rather tentative.
Regardless, there will be free drinks provided (pop / water).

Let me know if you can make it!

Mike


From kraranke at gmail.com  Tue Feb 24 11:42:47 2009
From: kraranke at gmail.com (kshitij)
Date: Tue, 24 Feb 2009 08:42:47 -0800 (PST)
Subject: thanks very much indeed for your help is there a better way to do
	this (python3) newby
References: <E306DE3F7B904BF094575153877180B6@Woodygar>
	<mailman.619.1235438967.11746.python-list@python.org>
Message-ID: <998cde7c-07ab-4400-b36e-904640e1c2a1@e24g2000vbe.googlegroups.com>

On Feb 24, 6:29?am, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Mon, 23 Feb 2009 23:33:31 -0000, Gary Wood <woody... at sky.com> wrote:
> > '''exercise to complete and test this function'''
> > import string
> > def joinStrings(items):
> > ? ? '''Join all the strings in stringList into one string,
> > ? ? and return the result. For example:
> > ? ? >>> print joinStrings(['very', 'hot', 'day'])
> > ? ? 'veryhotday'
> > ? ? '''
> > ? ? for i in items:
> > ? ? ? ?return (''.join(items))
>
> As I'm sure your teacher will point out, this is sub-optimal :-)
> That for-loop isn't doing anything, because you always return
> out of it at the first iteration.
>
> I suspect that you're expected to concatenate the strings
> together by hand and return the resulting string once you've
> done them all. ?Trying writing it that way.
>
> PS: it helps a lot if what you say in the doc string matches
> what you write in the rest of the code. ?In this case you
> call your input string "items", but then say "Join all the
> strings in *stringList*..."
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Here is another way of doing this:

print ('very' + 'hot' + 'day')

Hope this helps.


From see.signature at no.spam  Tue Feb 24 11:52:42 2009
From: see.signature at no.spam (Eric Brunel)
Date: Tue, 24 Feb 2009 17:52:42 +0100
Subject: tkinter icons as bytestrings, not files?
References: <slrngq6vfd.2u7.peter@box8.pjb.com.au>
Message-ID: <op.upu7t4xtwepdt4@ericb.pragmadev>

On Tue, 24 Feb 2009 05:56:12 +0100, Peter Billam <peter at www.pjb.com.au>  
wrote:

> Greetings,
>
> As a newbie, starting with Python3, I'm working my way through Mark
> Summerfield's tkinter examples.  In the toolbar, there's lines like:
>     for image, command in (
>         ('images/filenew.gif',  self.fileNew),
>         ('images/fileopen.gif', self.fileOpen),
>         ('images/filesave.gif', self.fileSave),
>         ('images/editadd.gif',  self.editAdd),
>         ('images/editedit.gif', self.editEdit),
>         ('images/editdelete.gif', self.editDelete),):
>     image = os.path.join(os.path.dirname(__file__), image)
>     image = tkinter.PhotoImage(file=image)
>     self.toolbar_images.append(image)
>     button = tkinter.Button(toolbar, image=image, command=command)
>     button.grid(row=0, column=len(self.toolbar_images) -1)
>
> which are always failing because the icons are in the wrong place
> and I can't help but wonder if I can put all these little images
> in the application itself, either as b'whatever' or uuencoded or
> in svg etc, and then invoke some suitable variation of the
>     image = tkinter.PhotoImage(file=image)
> or of the
>     button = tkinter.Button(toolbar, image=image, command=command)
> command ?  (I did try help('tkinter.PhotoImage') but didn't spot a
> magic key (unless it's "data=something, format=something")) ...

Just dump the contents of the file as a bytestring and use:
image = PhotoImage(data=the_byte_string)
With no extension, I guess it'll only work with GIF files, as it is the  
only natively supported image format in tcl/tk (AFAIK...).

HTH
-- 
python -c "print ''.join([chr(154 - ord(c)) for c in  
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])"


From adleslie at gmail.com  Tue Feb 24 12:27:31 2009
From: adleslie at gmail.com (May)
Date: Tue, 24 Feb 2009 09:27:31 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
Message-ID: <fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>

On Feb 23, 12:48?pm, Bruno Desthuilliers
<bdesth.quelquech... at free.quelquepart.fr> wrote:
> May a ?crit :
> (snip)
>
> > I may not stay with Django.
>
> Nope, but your question was about Django.
>
> > I am seriously looking for whether python
> > can read data from a relational database
>
> Of course - as long as there's a Python adapter for your DB.
>
> > and send to an html template
>
> Of course - as long as it's either a Python templating system or there's
> a Python binding for this system.
>
> > or do I always need some kind of wrapper/interface such as Rails
>
> Uh ? Rails is a Ruby framework.
>
> > or
> > Django? ?
>
> No, you don't. If you prefer to reinvent the wheel on each and any part
> of each an any web app you write, please feel free to do so.
>
> > If this is the wrong group to ask that question
>
> Which "that" question ?-)
>
> For question related to Django's ORM, the django group is indeed a
> better place (as usual: always use the most specific group / maling list
> / whatever first). If you have questions (like the above) that are about
> Python itself, you're at the right place.

Thanks for all your suggestions.  From what I've experienced in Django
and now that I know a little more about how Python functions, I will
probably use a combination of PHP and Django, instead of trying to get
Python to do the web portion of my project.  Thanks again!


From nick at craig-wood.com  Tue Feb 24 12:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Tue, 24 Feb 2009 11:31:53 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
Message-ID: <slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  No, It uses the the S-lang for video, and input control. However, SLAG
>  is more of an abstract layer on top of that.
> 
>  It has a Structures that contains menus and screens (menumodule /
>  screenmodule). One LOADS them up with parameters.  such as creating
>  a new menu is like:
> 
>  OpenMenu( Company name, SubSystem, this program name, mode, bottom
>  status display) - Create initial menu structure Addtomenu(Menu
>  Block Set name, DISPLAY line, ID, type of program, password ID ) -
>  add to / update MENU blocks.  runMenu() - Displays the whole create
>  menu structure.
> 
>  The Menu structure is done in pull downs and scrollable blocks in a
>  TUI (text User Interface) and using the S-lang screen library is
>  fully mouseable.
> 
>  The screen module works mych the same way, but with the abiltity to
>  open and close and work within "Sub Screens".
> 
>  For those who do not know, S-lang is a interpreted language much
>  like Python. However, there is s direth of library modules. The
>  original S-lang started out as library of screen of keyboard
>  modules, but has been expanded
> 
>  My SLAG project does not care in reality WHICH or what language, it
>  is simply handling menu and screen control.

So do you want to embed python into your code?

I'm still not clear what you are trying to achieve with python, though
I have a better idea what SLAG is now!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From traversos at gmail.com  Tue Feb 24 12:34:59 2009
From: traversos at gmail.com (Dario Traverso)
Date: Tue, 24 Feb 2009 12:34:59 -0500
Subject: Python Image Library IOError - cannot find JPEG decoder?
Message-ID: <8117677E-D022-41A3-A730-8AD76AE0F2A3@gmail.com>

I've been trying to install the Python Image Library  (PIL) on my Mac  
OSX Leopard laptop, but have been running into some difficulties.

I've built the library, using the included setup.py  script. The build  
summary checks out ok, and sounds the option libraries to all be  
found. I grabbed both libjpeg and freetype2  using  fink.

--------------------------------------------------------------------
PIL 1.1.6 BUILD SUMMARY
--------------------------------------------------------------------
version       1.1.6
platform      darwin 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
              [GCC 4.0.1 (Apple Inc. build 5465)]
--------------------------------------------------------------------
--- TKINTER support ok
--- JPEG support ok
--- ZLIB (PNG/ZIP) support ok
--- FREETYPE2 support ok
--------------------------------------------------------------------

However,  I then run the included self test, and 1 out of 57 tests  
fails. I receive an IOError. Specifically:

*****************************************************************
Failure in example: _info(Image.open("Images/lena.jpg"))
from line #24 of selftest.testimage
Exception raised:
Traceback (most recent call last):
  File "./doctest.py", line 499, in _run_examples_inner
    exec compile(source, "<string>", "single") in globs
  File "<string>", line 1, in <module>
  File "./selftest.py", line 22, in _info
    im.load()
  File "PIL/ImageFile.py", line 180, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available
1 items had failures:
   1 of  57 in selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.


I've followed all of the installation instructions exactly. The build  
summary reported everything was "ok". What could be the problem here.   
Libjpeg-6b  is not accessible?

Thank you for any insight you can provide!!

-Dario


From paul at boddie.org.uk  Tue Feb 24 12:39:44 2009
From: paul at boddie.org.uk (Paul Boddie)
Date: Tue, 24 Feb 2009 09:39:44 -0800 (PST)
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
Message-ID: <2ed478dd-0c85-4dc4-befe-478974669821@u1g2000vbb.googlegroups.com>

On 22 Feb, 12:24, Marcel Luethi <marcel.lue... at gmail.com> wrote:
>
> Using my iPhone I suddenly realize how easy it is to find applications
> in Apple's AppStore. How easy and fast it is to install or de-install
> an app. My iPhone even checks in the background if there is an upgrade
> which could be installed painlessly.

Yes, but this is just one platform. Can you download these iPhone
applications onto Android devices and use them? How would you package
your Objective-C (or whatever Apple has mandated) software for Android
or Debian or anything else out there?

> Then I see VMware's Virtual Appliance Marketplace, where you can
> download already pre-configured "appliances" for all kind of stuff.
> You can even download a basic appliance, install and configure your
> servers and tools - and upload it again, so that others can profit of
> your work.
>
> Unfortunately there's nothing like this in the Python world...

That's because you first wrote about platform-specific packaging and
now you're writing about language-specific packaging. And it's not as
if the former area hasn't been well addressed by Free Software,
either, but I suppose that's another discussion to be had.

> My idea: what about having a beefed up Cheeseshop for Python apps and
> an accompanying client app kind of iTunes for Python apps?
>
> The server side could be easily implemented with any of the current
> web frameworks. It's simply a management platform for the app packages
> (descriptions, versions, platforms, licenses, user's comments, number
> of downloads, ...) and the package files themselves.
> It should be definitely hosted by the PSF I think.

Well, what you're proposing risks exactly the same problems that many
other language-specific packaging solutions suffer from: it starts off
with specifying platforms, dependencies (which you didn't mention),
download files, and ends up with the user downloading huge amounts of
stuff that may already be on their system, mostly because such
solutions assume that the system doesn't really know anything about
what's already installed. Consequences of this may include a lack of
decent system-related tools to manage the result of installing stuff:
it would be like your iPhone application being installable on Android
by being dumped into the filesystem with little regard for existing
content and with no obvious strategy for safely removing the
application later.

It's true that there are other application repositories similar to the
VMware service you mention which don't really care about dependencies
and just offer self-contained applications for reasons of catering to
the lowest common denominator, and perhaps there's a desire to have
such services out there, but then again, doing such stuff specifically
for Python will lead you into making self-contained applications using
those "installer" technologies, or at least mapping and providing non-
Python library dependencies across multiple platforms. Or you could
just make it easier for Python projects to provide self-contained
applications based on VMware or Free Software alternatives - at least
that would allow you to focus on one platform, although the result
wouldn't be regarded as a "fully integrated" cross-platform approach
because a virtual machine would be involved.

> The multi-platform client should be intuitively and elegantly allow
> app browsing, downloading and installing those Python apps. In that
> respect it is sort of a Linux package manager (Synaptic, YUM, ...).

Why wouldn't you make use of existing system package management, then?

> But this is only the end-user related stuff. Furthermore it should
> allow to create new apps (probably based on a previously downloaded
> base app), package and upload them again (kind of Google AppEngine
> Launcher). Those base packages should include some basic management
> framework (for installation and configuration) and hopefully soon
> after the release of this platform they will be created in a broad
> variety to allow app developers to choose among many Python-version/
> platform/GUI/...-combinations.

Well, system packages of Python software typically make some use of
distutils to put files in the right places before bundling those files
together. The resulting system packages then work within a "basic
management framework", although I accept that there typically isn't
much support for trivial repackaging, although it isn't that difficult
to repackage, say, a Debian package and to publish it in your own
repository.

> IMHO an architecture like this would greatly enhance the productivity
> of the whole Python community by capitalizing the knowledge of many
> Python specialists. I don't have to find/install/configure all the
> basic stuff myself (see above) to build my app. But I can concentrate
> on my app because I'm standing on the shoulders of giants.

It isn't hard to find/install/configure the basic stuff in most GNU/
Linux distributions, either.

> I believe it also would make Python as a great platform more visible
> to the world - because there is only one place you have to go...
>
> What do you think???
> Is this crazy??? Or simply stupid?
> Or is this the way to world domination...? ;-)

Some people - usually Windows users - seem to like the idea of a
Python-specific solution, whereas others look to be able to administer
packages of many different kinds of software on their own system, and
in some environments people look to be able to administer packages for
many different kinds of system, at which point the Python-specific
interest becomes very small indeed. Generally, one has to choose one
of these levels and work mostly at that level when dealing with
packages, and I would argue that the best level is that of the system,
making language-specific solutions fit inside the facilities (and
restrictions) of the framework provided at the system level.

I think there is some merit in allowing people with a Python interest
to follow new developments (as can be done somewhat with the Package
Index) and for references to system-specific packages to be
incorporated into such a service. At one point I started writing a Web
application to do this, but instead of focusing on manual editing of
package details, it would be better to link the package records to
other services which make the actual system packages available. There
could also be unofficial build systems which provide such system
packages ahead of the usual operating system distribution release
schedule that people often complain about (in that they don't get the
latest stuff quickly enough).

For example, you'd have a package record like this:

  Name: XYZ
  Platforms:
    Debian: http://debian.package.server/python-xyz
    Windows: http://windows.package.server/python-xyz

Maybe you'd delegate the versioning and architecture availability to
the specific platforms.

> Unfortunately I'm not expert enough to build such a system - but if
> there is enough interest in the community I gladly would like to help.

There is ongoing work on packaging-related matters. Perhaps you should
subscribe to the catalog-sig or distutils-sig mailing lists (see
mail.python.org for details). That said, I'm skeptical about language-
specific packaging precisely because of the reasons given above, and
to make my own Python libraries and applications work within the
Debian mechanisms is something I've learned to do. Since that is all
that really matters to me, I don't see that much benefit in learning
something more sophisticated for Python which does less in my own
environment, which I consider to be the operating system and not the
language technology.

Paul


From digitig at gmail.com  Tue Feb 24 12:42:10 2009
From: digitig at gmail.com (Tim Rowe)
Date: Tue, 24 Feb 2009 17:42:10 +0000
Subject: try except question - serious foo bar question, and pulling my 
	hair out :-)
In-Reply-To: <6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>
References: <49A3D881.4070500@shopzeus.com>
	<op.upuuhknqx6zn5v@gabriel.sleipnir-bsas>
	<49A3E736.2020702@shopzeus.com> <49A3E943.3010405@shopzeus.com>
	<mailman.664.1235484376.11746.python-list@python.org>
	<6O2dnRdfEoj-iTnUnZ2dnUVZ_tbinZ2d@posted.visi>
Message-ID: <aee48b3c0902240942h70225429vabd16424e2e62ca6@mail.gmail.com>

2009/2/24 Grant Edwards <invalid at invalid>:

> It works with a person as well as stuffed toys -- but trying to
> order a person on the internet gets you in a lot more trouble.
> It's also a little more embarassing when you realize your
> mistake in front of a person. ?OTOH, sometimes a person will
> ask an enlightening question; but, sometimes they just make
> unhelpfull wisecracks. ?It's a tough choice.

I used to use a baby, which avoids the embarrassment but can be just
as problematic to order on the internet.

-- 
Tim Rowe


From nytrokiss at gmail.com  Tue Feb 24 12:45:44 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Tue, 24 Feb 2009 19:45:44 +0200
Subject: Unix Change Passwd Python CGI
In-Reply-To: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
References: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
Message-ID: <8a6b8e350902240945q3676adefjab2163ea8fdb8407@mail.gmail.com>

IMHO That sounds like the biggest security hole I can think of. Anyways you
can open a pipe to passwd. to have the change there password.

James

On Tue, Feb 24, 2009 at 5:19 PM, Derek Tracy <tracyde at gmail.com> wrote:

> I am using python version 2.5.1 and need to create a python cgi application
> to allow a user to change their unix password.
>
> Apache is running on the same system that needs the password changed.  I
> need to keep security high and can not install additional modules at this
> time.
>
> I just need a general direction to start looking, and I do not have expect
> installed on the system.
>
> Any ideas would be wonderful!
>
> R/S --
> ---------------------------------
> Derek Tracy
> tracyde at gmail.com
> ---------------------------------
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From mathieu.malaterre at gmail.com  Tue Feb 24 12:48:56 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Tue, 24 Feb 2009 09:48:56 -0800 (PST)
Subject: =?windows-1252?B?J3UnIAlPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gCSg3KQ==?=
Message-ID: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>

I did not know where to report that:

'u' 	Obselete type ? it is identical to 'd'. 	(7)

http://docs.python.org/library/stdtypes.html#string-formatting

Thanks


From blogger at ferg.org  Tue Feb 24 13:09:52 2009
From: blogger at ferg.org (blogger at ferg.org)
Date: Tue, 24 Feb 2009 10:09:52 -0800 (PST)
Subject: Python 3 and easygui problem
References: <49A0D88F.4010806@internode.on.net>
	<mailman.432.1235279162.11746.python-list@python.org>
Message-ID: <45725a69-d020-41e1-a159-3fa16a14a555@17g2000vbf.googlegroups.com>

Thanks to all for helping Peter on this.

Just a bit of an update...

The solution offered in this thread to Peter's original problem is the
same as the once I arrived at.  There is a bit of discussion about it
here:
http://pythonconquerstheuniverse.blogspot.com/2009/01/moving-to-python-30-part1.html

The current version of EasyGui doesn't run under 3.0, but Peter and I
are in contact and we're working on a version that will. (No estimated
availablity date yet.)

EasyGui is not in PyPI.  A semi-significant revision of EasyGui is in
the works (no predicted availablity date yet).  Once that revision is
out the door, I'll look into putting EasyGui into PyPI.

Again, thanks to all who participated in this thread.

-- Steve Ferg


From deets at nospam.web.de  Tue Feb 24 13:36:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Tue, 24 Feb 2009 19:36:28 +0100
Subject: python sql query in django
In-Reply-To: <fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
Message-ID: <70it1cF95tgfU1@mid.uni-berlin.de>

> 
> Thanks for all your suggestions.  From what I've experienced in Django
> and now that I know a little more about how Python functions, I will
> probably use a combination of PHP and Django, instead of trying to get
> Python to do the web portion of my project.  Thanks again!

That sounds like the worst idea. Django's ORM is good when used from 
within django, because of all the additional goodies like the admin 
interface.

But if you are going to do the webfrontend using PHP, what part is left 
for django? If it's only the ORM (for whatever you still use that 
anyway), there are better alternatives - SQLAlchemy, and SQLObject, for 
Python. They are more powerful and not interwoven with django.


If you are going to hand-code the interface in PHP, I fail to see though 
why you don't do that in Django directly. You are not forced to use the 
Admin-interface.

Diez


From mobiledreamers at gmail.com  Tue Feb 24 13:53:29 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Tue, 24 Feb 2009 10:53:29 -0800
Subject: Accessing callers context from callee method
Message-ID: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>

when i call a method foo from another method func. can i access func context
variables or locals() from foo
so
def func():
  i=10
  foo()

in foo, can i access func's local variables on in this case i
Thanks a lot
-- 
Bidegg worlds best auction site
http://bidegg.com
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From R.Bauer at fz-juelich.de  Tue Feb 24 13:53:43 2009
From: R.Bauer at fz-juelich.de (Reimar Bauer)
Date: Tue, 24 Feb 2009 19:53:43 +0100
Subject: pdftk
Message-ID: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>

Hi

Does one know about a python interface to pdftk?
Or something similar which can be used to fill a form by fdf data.

cheers
Reimar


From clp2 at rebertia.com  Tue Feb 24 13:56:36 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 10:56:36 -0800
Subject: Accessing callers context from callee method
In-Reply-To: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
Message-ID: <50697b2c0902241056h14e92b8cu3ea2270d3c1b5bd3@mail.gmail.com>

On Tue, Feb 24, 2009 at 10:53 AM,  <mobiledreamers at gmail.com> wrote:
> when i call a method foo from another method func.?can i access func context
> variables or locals() from foo
> so
> def func():
> ??i=10
> ??foo()
>
> in foo, can i access func's local variables on in this case i

You can, but it's an evil hack that I would avoid if at all possible;
there are almost certainly better ways to accomplish whatever your
goal is.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From zaheer.agadi at gmail.com  Tue Feb 24 14:05:26 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Tue, 24 Feb 2009 11:05:26 -0800 (PST)
Subject: Is there any equivalent feature available in Python..?
Message-ID: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>

Hi,

Is there any Python equivalent of java jar,can I include all my
sources,properties file etc into a single file.Is there anyway in
Python that I can run like the following

java  -jar Mytest.jar --startwebserver

How to so something like this in Python?

Thanks


From ajaksu at gmail.com  Tue Feb 24 14:12:42 2009
From: ajaksu at gmail.com (ajaksu)
Date: Tue, 24 Feb 2009 11:12:42 -0800 (PST)
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<mailman.454.1235312488.11746.python-list@python.org>
Message-ID: <d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>

Steve Holden wrote:
> And the "multiplatform client" that should "easily and elegantly allow
> app browsing, downloading and installing those apps" would presumably
> have to account for the many differences in package formats and install
> requirements between the different platforms.

And then you'd also need to re-download the app if you need it on a
(sometimes slightly) different platform.

Unless the Souq can beat Apple in its own game, by offering
Multiversal Binaries that work across hardware platforms, OSes and
their versions, GUI frameworks, Python versions and universes.
Settling for Downright Obese Binaries if supporting different
universes is considered overkill would be OK too.

shoulda-include-a-single-asset-8-by-8-shotgun-cross-compiler-ly y'rs
Daniel


From clp2 at rebertia.com  Tue Feb 24 14:15:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 11:15:50 -0800
Subject: Is there any equivalent feature available in Python..?
In-Reply-To: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0902241115q24a85659le2580a4b36d7a59c@mail.gmail.com>

On Tue, Feb 24, 2009 at 11:05 AM,  <zaheer.agadi at gmail.com> wrote:
> Hi,
>
> Is there any Python equivalent of java jar,can I include all my
> sources,properties file etc into a single file.Is there anyway in
> Python that I can run like the following
>
> java ?-jar Mytest.jar --startwebserver
>
> How to so something like this in Python?

It's mostly possible. See http://docs.python.org/library/zipimport.html

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From tjreedy at udel.edu  Tue Feb 24 14:19:54 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 24 Feb 2009 14:19:54 -0500
Subject: shared lib from python code?
In-Reply-To: <49A40ABB.6090502@arimaz.com>
References: <49A27608.3050403@arimaz.com>
	<49A28BD6.9040701@arimaz.com>	<89a1045472ca4ec4c07f26543032058e.squirrel@acooke.dyndns.org>
	<49A40ABB.6090502@arimaz.com>
Message-ID: <go1h8n$c2a$1@ger.gmane.org>

Gabriel Rossetti wrote:

> Ok, I see, thank you. I thought this was possible since I have used 
> *.pyd files before and from what I had read they were dynamic library 
> files. I guess they must be written in C/C++ then. Thank you for the 
> explanation.

Yes, that can be confusing.  Unlike .py, .pyc, .pyo, a .pyd is a 
Windows-only version of a .dll that is called .pyd instead of .dll for 
technical reasons I have forgotten.   The difference is not directly 
relevant to *Python* programming.



From kyosohma at gmail.com  Tue Feb 24 14:19:55 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Tue, 24 Feb 2009 11:19:55 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
Message-ID: <1ac16d2b-d189-4fca-8a3a-ff45636f118a@s36g2000vbp.googlegroups.com>

On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?No, It uses the the S-lang for video, and input control. However, SLAG
> > ?is more of an abstract layer on top of that.
>
> > ?It has a Structures that contains menus and screens (menumodule /
> > ?screenmodule). One LOADS them up with parameters. ?such as creating
> > ?a new menu is like:
>
> > ?OpenMenu( Company name, SubSystem, this program name, mode, bottom
> > ?status display) - Create initial menu structure Addtomenu(Menu
> > ?Block Set name, DISPLAY line, ID, type of program, password ID ) -
> > ?add to / update MENU blocks. ?runMenu() - Displays the whole create
> > ?menu structure.
>
> > ?The Menu structure is done in pull downs and scrollable blocks in a
> > ?TUI (text User Interface) and using the S-lang screen library is
> > ?fully mouseable.
>
> > ?The screen module works mych the same way, but with the abiltity to
> > ?open and close and work within "Sub Screens".
>
> > ?For those who do not know, S-lang is a interpreted language much
> > ?like Python. However, there is s direth of library modules. The
> > ?original S-lang started out as library of screen of keyboard
> > ?modules, but has been expanded
>
> > ?My SLAG project does not care in reality WHICH or what language, it
> > ?is simply handling menu and screen control.
>
> So do you want to embed python into your code?
>
> I'm still not clear what you are trying to achieve with python, though
> I have a better idea what SLAG is now!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Maybe he wants SendKeys? Here's the link just in case:
http://pypi.python.org/pypi/SendKeys/0.3

Mike


From madhav.bnk at gmail.com  Tue Feb 24 14:38:27 2009
From: madhav.bnk at gmail.com (madhav)
Date: Tue, 24 Feb 2009 11:38:27 -0800 (PST)
Subject: Run a linux system command as a superuser, using a python script
Message-ID: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>

I have got postfix installed on my machine and I am updating on of its
configuration files programmatically(using python)(on some action).
Since any change in the configuration needs a reload, I need to reload
postfix to reflect the latest change. How can I do that in a python
script. Precisely, I have something like this:

import subprocess
subprocess.Popen('sudo /etc/init.d/postifx reload')

Since this script should be run in no-human environment(on the fly), I
cant supply the sudo password or even root password(if needed). Even
sudo doesn't have a flag to input the password for the command at the
first shot. How do I do this?


From clp2 at rebertia.com  Tue Feb 24 14:44:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 11:44:16 -0800
Subject: Run a linux system command as a superuser, using a python script
In-Reply-To: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
Message-ID: <50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>

On Tue, Feb 24, 2009 at 11:38 AM, madhav <madhav.bnk at gmail.com> wrote:
> I have got postfix installed on my machine and I am updating on of its
> configuration files programmatically(using python)(on some action).
> Since any change in the configuration needs a reload, I need to reload
> postfix to reflect the latest change. How can I do that in a python
> script. Precisely, I have something like this:
>
> import subprocess
> subprocess.Popen('sudo /etc/init.d/postifx reload')
>
> Since this script should be run in no-human environment(on the fly), I
> cant supply the sudo password or even root password(if needed). Even
> sudo doesn't have a flag to input the password for the command at the
> first shot. How do I do this?

pexpect may be useful in this situation - http://www.noah.org/wiki/Pexpect

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From wescpy at gmail.com  Tue Feb 24 14:59:03 2009
From: wescpy at gmail.com (wesley chun)
Date: Tue, 24 Feb 2009 11:59:03 -0800
Subject: [Tutor] Accessing callers context from callee method
In-Reply-To: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
Message-ID: <78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>

> when i call a method foo from another method func.?can i access func context
> variables or locals() from foo
> so
> def func():
> ??i=10
> ??foo()
>
> in foo, can i access func's local variables


A. python has statically-nested scoping, so you can do it as long as you:

1. define foo() as an inner function -- its def is contained within
func()'s def:
def func():
    i = 10
    def foo():
        print i

2. you don't define a variable with the same name locally. in other
words, you do have access to func()'s 'i' as long as you don't create
another 'i' within foo() -- if you do, only your new local 'i' will be
within your scope.

B. another alterative is to pass in all of func()'s local variables to foo():

foo(**locals())

this will require you to accept the incoming dictionary in foo() and
access the variables from it instead of having them be in foo()'s
scope.

C. in a related note, your question is similar to that of global vs.
local variables. inside a function, you have access to the global as
long as you don't define a local using the same name. should you only
wish to manipulate the global one, i.e. assign a new value to it
instead of creating a new local variable with that name, you would
need to use the "global" keyword to specify that you only desire to
use and update the global one.

i = 0
def func():
    i = 10

in this example, the local 'i' in func() hides access to the global
'i'. in the next code snippet, you state you only want to
access/update the global 'i'... IOW, don't create a local one:

i = 0
def func():
    global i
    i = 10

D. this doesn't work well for inner functions yet:

i = 0
def func():
    i = 10
    def foo():
        i = 20

the 'i' in foo() shadows/hides access to func()'s 'i' as well as the
global 'i'. if you issue the 'global' keyword, that only gives you
access to the global one:

i = 0
def func():
    i = 10
    def foo():
        global i
        i = 20

you cannot get access to func()'s 'i' in this case.

E. however, starting in Python 3.x, you'll be able to do somewhat
better with the new 'nonlocal' keyword:

i = 0
print('globally, i ==', i)
def func():
    i = 10
    print('in func(), i ==', i)
    def foo():
        nonlocal i
        i = 20
        print('in foo(), i ==', i)
    foo()
    print('in func() after calling foo(), i ==', i)
func()

in this case, foo() modified func()'s 'i'.

hope this helps!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From marduk at letterboxes.org  Tue Feb 24 15:10:47 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Tue, 24 Feb 2009 15:10:47 -0500
Subject: Is there any equivalent feature available in Python..?
In-Reply-To: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
Message-ID: <1235506247.13502.8.camel@centar.nbk>

On Tue, 2009-02-24 at 11:05 -0800, zaheer.agadi at gmail.com wrote:
> Hi,
> 
> Is there any Python equivalent of java jar,can I include all my
> sources,properties file etc into a single file.Is there anyway in
> Python that I can run like the following
> 
> java  -jar Mytest.jar --startwebserver
> 
> How to so something like this in Python?

Similar but not equal:

$ tree mytest
mytest
|-- __init__.py
`-- main.py

$ cat mytest/__init__.py 
if __name__ == '__main__':
    import sys
    print sys.argv
    import mytest.main

$ cat mytest/main.py 
print 'hi mom'

$ zip -r mytest.zip mytest
  adding: mytest/ (stored 0%)
  adding: mytest/main.py (stored 0%)
  adding: mytest/__init__.py (deflated 4%)

$ PYTHONPATH=mytest.zip python -m mytest --startserver
[None, '--startserver']
hi mom





From rhamph at gmail.com  Tue Feb 24 15:16:40 2009
From: rhamph at gmail.com (Adam Olsen)
Date: Tue, 24 Feb 2009 12:16:40 -0800 (PST)
Subject: more on unescaping escapes
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org> 
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org> 
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org> 
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org> 
	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org> 
	<gnvldk$827$1@news.motzarella.org>
Message-ID: <ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>

On Feb 23, 7:18?pm, bvdp <b... at mellowood.ca> wrote:
> Gabriel Genellina wrote:
> > En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <b... at mellowood.ca> escribi?:
> >> Gabriel Genellina wrote:
> >>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <b... at mellowood.ca> escribi?:
> >>>> Chris Rebert wrote:
> >>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <b... at mellowood.ca> wrote:
>
> >>>>> [problem with Python and Windows paths using backslashes]
> >>>>> ?Is there any particular reason you can't just internally use regular
> >>>>> forward-slashes for the paths? [...]
>
> >>>> you are absolutely right! Just use '/' on both systems and be done
> >>>> with it. Of course I still need to use \x20 for spaces, but that is
> >>>> easy.
> >>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in
> >>> URLs, that becomes a space only after decoding.
>
> >> I need to use the \x20 because of my parser. I'm reading unquoted
> >> lines from a file. The file creater needs to use the form "foo\x20bar"
> >> without the quotes in the file so my parser can read it as a single
> >> token. Later, the string/token needs to be decoded with the \x20
> >> converted to a space.
>
> >> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"
> >> is one.
>
> >> So, it's not really a problem of what happens when you assign a string
> >> in the form "foo bar", rather how to convert the \x20 in a string to a
> >> space. I think the \\ just complicates the entire issue.
>
> > Just thinking, if you was reading the string from a file, why were you
> > worried about \\ and \ in the first place? (Ok, you moved to use / so
> > this is moot now).
>
> Just cruft introduced while I was trying to figure it all out. Having to
> figure the \\ and \x20 at same time with file and keyboard input just
> confused the entire issue :) Having the user set a line like
> c:\\Program\x20File ... works just fine. I'll suggest he use
> c:/program\x20files to make it bit simple for HIM, not my parser.
> Unfortunately, due to some bad design decisions on my part about 5 years
> ago I'm afraid I'm stuck with the \x20.
>
> Thanks.

You're confusing the python source with the actual contents of the
string.  We already do one pass at decoding, which is why \x20 is
quite literally no different from a space:

>>> '\x20'
' '

However, the interactive interpreter uses repr(x), so various
characters that are considered formatting, such as a tab, get
reescaped when printing:

>>> '\t'
'\t'
>>> len('\t')
1

It really is a tab that gets stored there, not the escape for one.

Finally, if you give python an unknown escape it passes it leaves it
as an escape.  Then, when the interactive interpreter uses repr(x), it
is the backslash itself that gets reescaped:

>>> '\P'
'\\P'
>>> len('\P')
2
>>> list('\P')
['\\', 'P']

What does this all mean?  If you want to test your parser with python
literals you need to escape them twice, like so:

>>> 'c:\\\\Program\\x20Files\\\\test'
'c:\\\\Program\\x20Files\\\\test'
>>> list('c:\\\\Program\\x20Files\\\\test')
['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
'2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']
>>> 'c:\\\\Program\\x20Files\\\\test'.decode('string-escape')
'c:\\Program Files\\test'
>>> list('c:\\\\Program\\x20Files\\\\test'.decode('string-escape'))
['c', ':', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', ' ', 'F', 'i',
'l', 'e', 's', '\\', 't', 'e', 's', 't']

However, there's an easier way: use raw strings, which prevent python
from unescaping anything:

>>> r'c:\\Program\x20Files\\test'
'c:\\\\Program\\x20Files\\\\test'
>>> list(r'c:\\Program\x20Files\\test')
['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
'2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']


From sjmachin at lexicon.net  Tue Feb 24 15:24:44 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 12:24:44 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
Message-ID: <31fa575a-cc0d-4830-ae23-0a784fa3361f@13g2000yql.googlegroups.com>

On Feb 25, 4:48?am, mathieu <mathieu.malate... at gmail.com> wrote:
> I did not know where to report that:
>
> 'u' ? ? Obselete type ? it is identical to 'd'. ? ? ? (7)
>
> http://docs.python.org/library/stdtypes.html#string-formatting


So what's your problem with that? Do you believe that 'u' is not
accepted? That 'u' is not identical to 'd' and thus the doc should be
rewritten as "its behaviour is identical to that of 'd'"? That the
behaviour of 'u' is NOT identical to that of 'd'? That 'u' should not
be documented? That 'u' should not be described as obselete?



From rt8396 at gmail.com  Tue Feb 24 15:28:58 2009
From: rt8396 at gmail.com (r)
Date: Tue, 24 Feb 2009 12:28:58 -0800 (PST)
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org> 
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com> 
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com> 
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com> 
	<mailman.379.1235164156.11746.python-list@python.org>
Message-ID: <0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>

On Feb 20, 3:09?pm, Dotan Cohen <dotanco... at gmail.com> wrote:
> > Even 3DS or Maya is easier to learn that Blender.
>
> Notepad is easier to learn that VI. Not a good program does simple make.

And not a good program does complex make either Yoda.

Assembly language is very powerful and allows full control down to the
processor level. With your logic all programs would be written in
assembly. Only problem is with that logic we would be 30 years behind
in development of software at this time. Abstraction is paramount to
advancement. With abstraction now you can focus on the problem at hand
instead of miles of steps just to get to the problem at hand. Human
beings are not hardware, we need high levels of abstraction so we can
do what we do best... dream, image, and create.


From zorro at chez.Com  Tue Feb 24 15:43:17 2009
From: zorro at chez.Com (JB)
Date: Tue, 24 Feb 2009 21:43:17 +0100
Subject: pdftk
In-Reply-To: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
References: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
Message-ID: <49a45bee$0$4999$426a74cc@news.free.fr>

Reimar Bauer a ?crit :
> Hi
> 
> Does one know about a python interface to pdftk?
> Or something similar which can be used to fill a form by fdf data.

everyday i use :

import os
os.system("pdftk.exe source.pdf fill_form data.fdf output output.pdf 
flatten")

and BIM


;)


From yanegomi at gmail.com  Tue Feb 24 15:55:15 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Tue, 24 Feb 2009 12:55:15 -0800
Subject: Cross-compiling error when compiling 2.6.1...
Message-ID: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>

I come across the following error:

checking for chflags... configure: error: cannot run test program
while cross compiling
See `config.log' for more details.
make-3.81[1]: ***
[/nobackup/garrcoop/python_upgrade/contrib/python/obj-mips32/Makefile]
Error 1
make-3.81[1]: Leaving directory `/nobackup/garrcoop/python_upgrade'
make-3.81: *** [all] Error 2

The blurb from configure that does this test says:

# On Tru64, chflags seems to be present, but calling it will
# exit Python

Basically this testcase (while valid for Tru64) doesn't work with many
cross-compilation environments. Couldn't test instead be disabled, but
the compilation continue with a warning? Erroring out the build seems
like a silly decision...

Thanks,
-Garrett


From cto at openmigration.net  Tue Feb 24 16:04:36 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:04:36 -0500
Subject: Python AppStore / Marketplace
In-Reply-To: <d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com>
	<mailman.454.1235312488.11746.python-list@python.org>
	<d1c55b45-c3ed-4397-bfe3-d1eb14928dd3@g38g2000yqd.googlegroups.com>
Message-ID: <f3cc57c60902241304l68cee5e1j6b4d54f446f28fa7@mail.gmail.com>

Just a few quick questions on your proposed design:

1) What tools, if any, do you propose to help developers package for this
platform?
2) How do you plan to deal with applications that change or depend on
system-wide settings, ie, conf files, kernel version, or the registry?
3) What advantages do you see this having over, say, porting portage or
apt-get?

Thanks for your time,

Geremy Condra
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From adleslie at gmail.com  Tue Feb 24 16:13:34 2009
From: adleslie at gmail.com (May)
Date: Tue, 24 Feb 2009 13:13:34 -0800 (PST)
Subject: python sql query in django
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
Message-ID: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>

On Feb 24, 10:36?am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > Thanks for all your suggestions. ?From what I've experienced in Django
> > and now that I know a little more about how Python functions, I will
> > probably use a combination of PHP and Django, instead of trying to get
> > Python to do the web portion of my project. ?Thanks again!
>
> That sounds like the worst idea. Django's ORM is good when used from
> within django, because of all the additional goodies like the admin
> interface.
>
> But if you are going to do the webfrontend using PHP, what part is left
> for django? If it's only the ORM (for whatever you still use that
> anyway), there are better alternatives - SQLAlchemy, and SQLObject, for
> Python. They are more powerful and not interwoven with django.
>
> If you are going to hand-code the interface in PHP, I fail to see though
> why you don't do that in Django directly. You are not forced to use the
> Admin-interface.
>
> Diez

Hello Diez,

I think Django is fabulous for the admin-interface, a simple text
search and template inheritance.  I will use Django for all of those.
What I'm not getting an answer to and cannot find an example of is a
complex search, where I have to retrieve data from multiple tables,
combine the data, remove the duplicates, etc between a web page and
the database.  The code that started this thread is only a small piece
of the complex data retrieval I need to do.  PHP is great for writing
complex SQL queries right in the HTML template and I know exactly what
it is doing.


From bob at mellowood.ca  Tue Feb 24 16:13:47 2009
From: bob at mellowood.ca (bvdp)
Date: Tue, 24 Feb 2009 14:13:47 -0700
Subject: more on unescaping escapes
In-Reply-To: <ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>
References: <gnv6jn$4nh$1@news.motzarella.org>
	<mailman.583.1235428603.11746.python-list@python.org>
	<gnvdb6$mf6$1@news.motzarella.org>
	<mailman.604.1235434399.11746.python-list@python.org>
	<gnvern$6a5$1@news.motzarella.org>
	<mailman.614.1235436113.11746.python-list@python.org>
	<gnvg1a$g7g$1@news.motzarella.org>
	<mailman.618.1235438099.11746.python-list@python.org>
	<gnvila$fne$1@news.motzarella.org>
	<mailman.623.1235440480.11746.python-list@python.org>
	<gnvldk$827$1@news.motzarella.org>
	<ce7e4d65-11b9-4974-923c-0f1138fa1296@n30g2000vba.googlegroups.com>
Message-ID: <go1nub$98q$1@news.motzarella.org>

Adam Olsen wrote:
> On Feb 23, 7:18 pm, bvdp <b... at mellowood.ca> wrote:
>> Gabriel Genellina wrote:
>>> En Mon, 23 Feb 2009 23:31:20 -0200, bvdp <b... at mellowood.ca> escribi?:
>>>> Gabriel Genellina wrote:
>>>>> En Mon, 23 Feb 2009 22:46:34 -0200, bvdp <b... at mellowood.ca> escribi?:
>>>>>> Chris Rebert wrote:
>>>>>>> On Mon, Feb 23, 2009 at 4:26 PM, bvdp <b... at mellowood.ca> wrote:
>>>>>>> [problem with Python and Windows paths using backslashes]
>>>>>>>  Is there any particular reason you can't just internally use regular
>>>>>>> forward-slashes for the paths? [...]
>>>>>> you are absolutely right! Just use '/' on both systems and be done
>>>>>> with it. Of course I still need to use \x20 for spaces, but that is
>>>>>> easy.
>>>>> Why is that? "\x20" is exactly the same as " ". It's not like %20 in
>>>>> URLs, that becomes a space only after decoding.
>>>> I need to use the \x20 because of my parser. I'm reading unquoted
>>>> lines from a file. The file creater needs to use the form "foo\x20bar"
>>>> without the quotes in the file so my parser can read it as a single
>>>> token. Later, the string/token needs to be decoded with the \x20
>>>> converted to a space.
>>>> So, in my file "foo bar" (no quotes) is read as 2 tokens; "foo\x20bar"
>>>> is one.
>>>> So, it's not really a problem of what happens when you assign a string
>>>> in the form "foo bar", rather how to convert the \x20 in a string to a
>>>> space. I think the \\ just complicates the entire issue.
>>> Just thinking, if you was reading the string from a file, why were you
>>> worried about \\ and \ in the first place? (Ok, you moved to use / so
>>> this is moot now).
>> Just cruft introduced while I was trying to figure it all out. Having to
>> figure the \\ and \x20 at same time with file and keyboard input just
>> confused the entire issue :) Having the user set a line like
>> c:\\Program\x20File ... works just fine. I'll suggest he use
>> c:/program\x20files to make it bit simple for HIM, not my parser.
>> Unfortunately, due to some bad design decisions on my part about 5 years
>> ago I'm afraid I'm stuck with the \x20.
>>
>> Thanks.
> 
> You're confusing the python source with the actual contents of the
> string.  We already do one pass at decoding, which is why \x20 is
> quite literally no different from a space:
> 
>>>> '\x20'
> ' '
> 
> However, the interactive interpreter uses repr(x), so various
> characters that are considered formatting, such as a tab, get
> reescaped when printing:
> 
>>>> '\t'
> '\t'
>>>> len('\t')
> 1
> 
> It really is a tab that gets stored there, not the escape for one.
> 
> Finally, if you give python an unknown escape it passes it leaves it
> as an escape.  Then, when the interactive interpreter uses repr(x), it
> is the backslash itself that gets reescaped:
> 
>>>> '\P'
> '\\P'
>>>> len('\P')
> 2
>>>> list('\P')
> ['\\', 'P']
> 
> What does this all mean?  If you want to test your parser with python
> literals you need to escape them twice, like so:
> 
>>>> 'c:\\\\Program\\x20Files\\\\test'
> 'c:\\\\Program\\x20Files\\\\test'
>>>> list('c:\\\\Program\\x20Files\\\\test')
> ['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
> '2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']
>>>> 'c:\\\\Program\\x20Files\\\\test'.decode('string-escape')
> 'c:\\Program Files\\test'
>>>> list('c:\\\\Program\\x20Files\\\\test'.decode('string-escape'))
> ['c', ':', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', ' ', 'F', 'i',
> 'l', 'e', 's', '\\', 't', 'e', 's', 't']
> 
> However, there's an easier way: use raw strings, which prevent python
> from unescaping anything:
> 
>>>> r'c:\\Program\x20Files\\test'
> 'c:\\\\Program\\x20Files\\\\test'
>>>> list(r'c:\\Program\x20Files\\test')
> ['c', ':', '\\', '\\', 'P', 'r', 'o', 'g', 'r', 'a', 'm', '\\', 'x',
> '2', '0', 'F', 'i', 'l', 'e', 's', '\\', '\\', 't', 'e', 's', 't']

Thank you. That is very clear. Appreciate your time.


From cto at openmigration.net  Tue Feb 24 16:16:07 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:16:07 -0500
Subject: Python 3D CAD -- need collaborators, or just brave souls :)
In-Reply-To: <0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>
References: <ed4b7b84-2169-44c4-8cb6-b26b5b3d61e4@h16g2000yqj.googlegroups.com>
	<4993DE39.8030200@cosc.canterbury.ac.nz>
	<mailman.151.1234903676.11746.python-list@python.org>
	<9ef65856-0f62-4434-a4b4-e15558e7c7b0@n2g2000vba.googlegroups.com>
	<fe7a97b4-af36-417b-8482-44b49fdec5fe@p23g2000prp.googlegroups.com>
	<5764d607-e323-4996-aa6f-a7f04c779110@i38g2000yqd.googlegroups.com>
	<mailman.379.1235164156.11746.python-list@python.org>
	<0d1eee24-4fff-4112-8e26-09ab537c3858@m2g2000vbp.googlegroups.com>
Message-ID: <f3cc57c60902241316s49e5fb14v4197e660a32a3d71@mail.gmail.com>

I'm interested. If you are still serious about doing this in two months,
send me an email. If you have
something put together at that point we can talk about its future. Sound
fair?

Geremy Condra
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From cto at openmigration.net  Tue Feb 24 16:26:15 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 16:26:15 -0500
Subject: Run a linux system command as a superuser, using a python script
In-Reply-To: <50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
	<50697b2c0902241144x1652f4cdl85e3fe4c61338c61@mail.gmail.com>
Message-ID: <f3cc57c60902241326j790cad8au4c2e76b1ca1d9bba@mail.gmail.com>

Run the script as root and have it drop privs when it doesn't need them. Or
set up a separate daemon to do the rootish parts of it.
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From btaylordesign at gmail.com  Tue Feb 24 16:34:39 2009
From: btaylordesign at gmail.com (Brandon Taylor)
Date: Tue, 24 Feb 2009 13:34:39 -0800 (PST)
Subject: Problem with environment variables and cx_Oracle
Message-ID: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>

Hello everyone,

Here's my setup: OS X (10.5.6 - Intel), Oracle Instant Clinet 10_2,
Python 2.6.1, Django trunk

I have my Oracle instantclient folder at: /Users/bft228/Library/Oracle/
instantclient_10_2

In my .bash_profile, I have ORACLE_HOME and LD_LIBRARY_PATH specified
as:

ORACLE_HOME="$HOME/Library/Oracle/instantclient_10_2"
export ORACLE_HOME

LD_LIBRARY_PATH=$ORACLE_HOME
export LD_LIBRARY_PATH


When I try to compile cx_Oracle-4.4.1 or 5.0.1, I get an error stating
that it cannot find an Oracle installation. setup.py will error here:

# try to determine the Oracle home
userOracleHome = os.environ.get("ORACLE_HOME")


Now, here's where things get wierd...
If I: echo $ORACLE_HOME = /Users/bft228/Library/Oracle/
instantclient_10_2
If I: python
      import os
      os.environ

      'ORACLE_HOME': '/Users/bft228/Library/Oracle/
instantclient_10_2',
      'LD_LIBRARY_PATH': '/Users/bft228/Library/Oracle/
instantclient_10_2'

If I hard-code the userOracleHome, cx_Oracle will compile, but I'm
getting errors wen attempting to connect to Oracle, like:
cx_Oracle.InterfaceError: Unable to acquire Oracle environment handle

I've been wrestling with this for quite some time. My Oracle person
assures me that my user has appropriate permissions for the schema. My
Oracle experience is pretty limited, but this seems like it's an issue
with the environment on my Mac.

Does anyone have any ideas? I would REALLY appreciate some insight.

Kind regards,
Brandon Taylor

Senior Web Developer
The University of Texas at Austin


From fabiofz at gmail.com  Tue Feb 24 16:36:13 2009
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Tue, 24 Feb 2009 18:36:13 -0300
Subject: Pydev 1.4.4 Released
Message-ID: <cfb578b20902241336v600d854ek9021598fcc38e88c@mail.gmail.com>

Hi All,

Pydev and Pydev Extensions 1.4.4 have been released -- note that the
release already happened 4 days ago... :)

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com


Release Highlights in Pydev:
----------------------------------------------

This release fixes a critical bug when configuring the interpreter (if
no environment variables were specified, it was not possible to
configure an interpreter)


What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python and
Jython development -- making Eclipse a first class Python IDE -- It
comes with many goodies such as code completion, syntax highlighting,
syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev Extensions
http://www.fabioz.com/pydev

Pydev - Python Development Enviroment for Eclipse
http://pydev.sf.net
http://pydev.blogspot.com


From david.birdsong at gmail.com  Tue Feb 24 16:37:24 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 13:37:24 -0800 (PST)
Subject: Run a linux system command as a superuser, using a python script
References: <e0c1cbcd-59f4-4117-9f22-240259326f71@m24g2000vbp.googlegroups.com>
	<mailman.682.1235504660.11746.python-list@python.org>
Message-ID: <7a449358-dc80-4063-a5cd-a5a1ffd9fba8@c36g2000yqn.googlegroups.com>

On Feb 24, 11:44?am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 11:38 AM, madhav <madhav.... at gmail.com> wrote:
> > I have got postfix installed on my machine and I am updating on of its
> > configuration files programmatically(using python)(on some action).
> > Since any change in the configuration needs a reload, I need to reload
> > postfix to reflect the latest change. How can I do that in a python
> > script. Precisely, I have something like this:
>
> > import subprocess
> > subprocess.Popen('sudo /etc/init.d/postifx reload')
>
> > Since this script should be run in no-human environment(on the fly), I
> > cant supply the sudo password or even root password(if needed). Even
> > sudo doesn't have a flag to input the password for the command at the
> > first shot. How do I do this?
>
> pexpect may be useful in this situation -http://www.noah.org/wiki/Pexpect
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

I vote down the pexpect, you'd be hardcoding a password.  How about
adjusting the sudoers file to grant the user of this script sudo on /
etc/init.d/postifx or even sudo on your python script.


From yanegomi at gmail.com  Tue Feb 24 16:47:02 2009
From: yanegomi at gmail.com (Garrett Cooper)
Date: Tue, 24 Feb 2009 13:47:02 -0800
Subject: Cross-compiling error when compiling 2.6.1...
In-Reply-To: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>
References: <364299f40902241255i29cfe3f9h36bd5e549ab5dcc3@mail.gmail.com>
Message-ID: <364299f40902241347m66cd3199h3ee40241f886effc@mail.gmail.com>

On Tue, Feb 24, 2009 at 12:55 PM, Garrett Cooper <yanegomi at gmail.com> wrote:
> I come across the following error:
>
> checking for chflags... configure: error: cannot run test program
> while cross compiling
> See `config.log' for more details.
> make-3.81[1]: ***
> [/nobackup/garrcoop/python_upgrade/contrib/python/obj-mips32/Makefile]
> Error 1
> make-3.81[1]: Leaving directory `/nobackup/garrcoop/python_upgrade'
> make-3.81: *** [all] Error 2
>
> The blurb from configure that does this test says:
>
> # On Tru64, chflags seems to be present, but calling it will
> # exit Python
>
> Basically this testcase (while valid for Tru64) doesn't work with many
> cross-compilation environments. Couldn't test instead be disabled, but
> the compilation continue with a warning? Erroring out the build seems
> like a silly decision...
>
> Thanks,
> -Garrett

    I've so far tied this issue down to the chflags, lchflags, and
printf with %zd support tests. After commenting out those items things
run to completion.
-Garrett


From jason.scheirer at gmail.com  Tue Feb 24 16:51:23 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 13:51:23 -0800 (PST)
Subject: pdftk
References: <go1fhl$70r4$1@zam602.zam.kfa-juelich.de>
	<49a45bee$0$4999$426a74cc@news.free.fr>
Message-ID: <173702ed-5f86-464a-8153-43a4442957c4@b16g2000yqb.googlegroups.com>

On Feb 24, 12:43?pm, JB <zo... at chez.Com> wrote:
> Reimar Bauer a ?crit :
>
> > Hi
>
> > Does one know about a python interface to pdftk?
> > Or something similar which can be used to fill a form by fdf data.
>
> everyday i use :
>
> import os
> os.system("pdftk.exe source.pdf fill_form data.fdf output output.pdf
> flatten")
>
> and BIM
>
> ;)

Reportlab will let you use an existing PDF as a template, letting you
use its text layout routines to overly your data on the existing page
and output a new document.


From steve at pearwood.info  Tue Feb 24 17:06:28 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Wed, 25 Feb 2009 09:06:28 +1100
Subject: 'u' 	Obselete type =?UTF-8?B?4oCT?= it is identical to 'd'. 	(7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
Message-ID: <01b464c4$0$18215$c3e8da3@news.astraweb.com>

mathieu wrote:

> I did not know where to report that:
> 
> 'u'   Obselete type ? it is identical to 'd'.         (7)
> 
> http://docs.python.org/library/stdtypes.html#string-formatting
> 
> Thanks

If you google on "python bug tracker" the first link is the correct one.

I don't know what you want to report, but I've reported that obsolete is
mispelled:

http://bugs.python.org/issue5361


-- 
Steven



From lionel.keene at gmail.com  Tue Feb 24 17:57:52 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 14:57:52 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
Message-ID: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>

Hello people, I'm looking for a way to get the screen dimensions (in
pixels) using the standard Python library. The only thing I found so
far was the following:

from win32api import GetSystemMetrics
Width = GetSystemMetrics(0)
Height = GetSystemMetrics(1)

I get an error claiming "no module named win32api". It's platform
specific anyway, but I thought I would try.

Anyone got this?

-L


From sjmachin at lexicon.net  Tue Feb 24 18:04:05 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 15:04:05 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
Message-ID: <f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>

On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> mathieu wrote:
> > I did not know where to report that:
>
> > 'u' ? Obselete type ? it is identical to 'd'. ? ? ? ? (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> > Thanks
>
> If you google on "python bug tracker" the first link is the correct one.
>
> I don't know what you want to report, but I've reported that obsolete is
> mispelled:
>
> http://bugs.python.org/issue5361

+1 Own Goal of the Year ... see
 http://www.yourdictionary.com/library/misspelled.html





From kyrie at uh.cu  Tue Feb 24 18:53:13 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 24 Feb 2009 18:53:13 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
Message-ID: <200902241853.13785.kyrie@uh.cu>

On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
> from win32api import GetSystemMetrics

I'd guess that win32api is patform specific, as in "api for win32".

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From cto at openmigration.net  Tue Feb 24 18:59:31 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 18:59:31 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <200902241853.13785.kyrie@uh.cu>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<200902241853.13785.kyrie@uh.cu>
Message-ID: <f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>

For X systems you can use xwininfo, ie:

from commands import getstatusoutput

def get_screen_dims():
status, output = getstatusoutput("xwininfo -root")
if not status:


On Tue, Feb 24, 2009 at 6:53 PM, Luis Zarrabeitia <kyrie at uh.cu> wrote:

> On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
> > from win32api import GetSystemMetrics
>
> I'd guess that win32api is patform specific, as in "api for win32".
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.
> http://profesores.matcom.uh.cu/~kyrie<http://profesores.matcom.uh.cu/%7Ekyrie>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
OpenMigration LLC- Open Source solutions for your business. Visit us at
http://OpenMigration.net.
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From cto at openmigration.net  Tue Feb 24 19:07:47 2009
From: cto at openmigration.net (geremy condra)
Date: Tue, 24 Feb 2009 19:07:47 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<200902241853.13785.kyrie@uh.cu>
	<f3cc57c60902241559q244b024fj24b16a9a027ad790@mail.gmail.com>
Message-ID: <f3cc57c60902241607o40fe03afy1f2a7e2617cffbe5@mail.gmail.com>

my apologies- hit enter accidentally. anyway, just process the output of
that command for the Height: and Width: lines.
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From starsareblueandfaraway at gmail.com  Tue Feb 24 19:07:58 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Tue, 24 Feb 2009 19:07:58 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
Message-ID: <6a5569ec0902241607y42824929l7d3c93c7571ff24b@mail.gmail.com>

Dear python-list,

I'm having some trouble decoding an email header using the standard
imaplib.IMAP4 class and email.message_from_string method.

In particular, email.message_from_string() does not seem to properly
decode unicode characters in the subject.

How do I decode unicode characters in the subject?

I read on the documentation that the email module supports RFC 2047.
But is there a way to make imaplib.IMAP4 and email.message_from_string
use this protocol?  I'm using Python 2.5.2 on Fedora.  Perhaps this
problem has been fixed already in Python 2.6.

RHH


From lionel.keene at gmail.com  Tue Feb 24 19:12:36 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 16:12:36 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
Message-ID: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>

On Feb 24, 3:53?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 24 February 2009 05:57:52 pm Lionel wrote:
>
> > from win32api import GetSystemMetrics
>
> I'd guess that win32api is patform specific, as in "api for win32".
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

Yes, it's platform specific. I was just trying anyway to see if it
would work.

In a nutshell, what I need is a way to acquire the screen dimensions
(in pixels) and its dpi setting.


From zvezdan at zope.com  Tue Feb 24 19:28:43 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Tue, 24 Feb 2009 19:28:43 -0500
Subject: Problem with environment variables and cx_Oracle
In-Reply-To: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>
References: <26f558b7-4ddb-4297-a4ff-ec499df8baa7@r24g2000vbp.googlegroups.com>
Message-ID: <267ABB0C-137A-498D-B078-D74B2E609EC9@zope.com>

On Feb 24, 2009, at 4:34 PM, Brandon Taylor wrote:
> Here's my setup: OS X (10.5.6 - Intel), Oracle Instant Clinet 10_2,
> Python 2.6.1, Django trunk

OS X is an important detail here.

> In my .bash_profile, I have ORACLE_HOME and LD_LIBRARY_PATH specified
> as:
>
> ORACLE_HOME="$HOME/Library/Oracle/instantclient_10_2"
> export ORACLE_HOME
>
> LD_LIBRARY_PATH=$ORACLE_HOME
> export LD_LIBRARY_PATH

Shouldn't this be DYLD_LIBRARY_PATH for Mac?


From bignose+hates-spam at benfinney.id.au  Tue Feb 24 19:32:03 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Wed, 25 Feb 2009 11:32:03 +1100
Subject: 'u'  Obselete type =?utf-8?Q?=E2=80=93?= it is identical to
	'd'.  (7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
Message-ID: <878wnvgxvg.fsf@benfinney.id.au>

John Machin <sjmachin at lexicon.net> writes:

> On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> > I don't know what you want to report, but I've reported that obsolete is
> > mispelled:
> 
> +1 Own Goal of the Year ... see
>  http://www.yourdictionary.com/library/misspelled.html

Not so notable. It's merely one more incident of the law of
communication variously known as McKean's Law, Skitt's Law, and
Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.

-- 
 \      ?I have never made but one prayer to God, a very short one: ?O |
  `\           Lord, make my enemies ridiculous!? And God granted it.? |
_o__)                                                        ?Voltaire |
Ben Finney


From jmcmonagle at NO.SPAM.velseis.com.au  Tue Feb 24 19:38:46 2009
From: jmcmonagle at NO.SPAM.velseis.com.au (John McMonagle)
Date: Wed, 25 Feb 2009 10:38:46 +1000
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
Message-ID: <49a4930c@dnews.tpgi.com.au>

Lionel wrote:
> Yes, it's platform specific. I was just trying anyway to see if it
> would work.
> 
> In a nutshell, what I need is a way to acquire the screen dimensions
> (in pixels) and its dpi setting.

This should work on all platforms:

from Tkinter import *
r = Tk()
r.withdraw()
r.winfo_screenheight()
r.winfo_screenwidth()
r.winfo_pixels('1i')


Regards,

John


From kyrie at uh.cu  Tue Feb 24 19:41:09 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Tue, 24 Feb 2009 19:41:09 -0500
Subject: Getting screen dims platform specific? Say it ain't so!
In-Reply-To: <52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
Message-ID: <200902241941.09240.kyrie@uh.cu>

On Tuesday 24 February 2009 07:12:36 pm Lionel wrote:
> In a nutshell, what I need is a way to acquire the screen dimensions
> (in pixels) and its dpi setting.

This is a guess, and a guess only. 
What do you want to know it for? If it is for painting something on the 
screen, maybe (just maybe - I'm guessing here big time), whatever API you are 
using for painting can be used for getting the dimensions of the drawing 
device. I don't even know if GTK or Qt have that feature, but you should look 
into it. If the same api you will use for painting provides that 
functionality, then it would be kind of irrelevant if it is on the stdlib or 
not.

Of course, this only applies if you want to paint and your api provides that 
info.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From sjmachin at lexicon.net  Tue Feb 24 19:52:15 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 16:52:15 -0800 (PST)
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
Message-ID: <44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>

On Feb 25, 11:07?am, "Roy H. Han" <starsareblueandfara... at gmail.com>
wrote:
> Dear python-list,
>
> I'm having some trouble decoding an email header using the standard
> imaplib.IMAP4 class and email.message_from_string method.
>
> In particular, email.message_from_string() does not seem to properly
> decode unicode characters in the subject.
>
> How do I decode unicode characters in the subject?

You don't. You can't. You decode str objects into unicode objects. You
encode unicode objects into str objects. If your input is not a str
object, you have a problem.

I'm no expert on the email package, but experts don't have crystal
balls, so let's gather some data for them while we're waiting for
their timezones to align:

Presumably your code is doing something like:
   msg = email.message_from_string(a_string)

Please report the results of
   print repr(a_string)
and
   print type(msg)
   print msg.items()
and tell us what you expected.

Cheers,
John


From ethan at stoneleaf.us  Tue Feb 24 19:52:20 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Tue, 24 Feb 2009 16:52:20 -0800
Subject: pep 8 constants
In-Reply-To: <glbc6v$9eh$1@ger.gmane.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org>
Message-ID: <49A49644.80509@stoneleaf.us>

Steve Holden wrote:
> Brian Allen Vanderburg II wrote:
> 
>>bockman at virgilio.it wrote:
>>
>>>Constants would be a nice addition in python, sure enough.
>>>But I'm not sure that this can be done without a run-time check every
>>>time
>>>the constant is used, and python is already slow enough. Maybe a check
>>>that is disabled when running with optimizing flags ?
>>>
>>>But I'm sure this discussion has been already made and the FINAL WORD has
>>>been already spoken.
>>>
>>>Ciao
>>>----
>>>FB
>>
>>One idea to make constants possible would be to extend properties to be
>>able to exist at the module level as well as the class level:
>>
>>@property
>>def pi():
>>   return 3.14159.....
>>
>>print(pi) # prints 3.14159....
>>pi=32 # Raise an error Cannot set attribute ...
>>
> 
> I don't understand why this would print 3.14159 ... instead of <function
> __math__.pi>, or whatever.
> 
> property would clearly have to do something very different in module
> scope in order to make this work.
> 
> regards
>  Steve

--> class tester(object):
...   @property
...   def pi(self):
...     return 3.141596
...
--> testee = tester()
--> testee.pi
3.1415959999999998

Looks like that's how property works, so the same behavior on a module 
level would do as Brian suggests.
--
~Ethan~


From lionel.keene at gmail.com  Tue Feb 24 20:03:03 2009
From: lionel.keene at gmail.com (Lionel)
Date: Tue, 24 Feb 2009 17:03:03 -0800 (PST)
Subject: Getting screen dims platform specific? Say it ain't so!
References: <a0ce893d-3051-4e77-aa50-1993eb57c8f7@z1g2000yqn.googlegroups.com>
	<mailman.691.1235519604.11746.python-list@python.org>
	<52d71fbc-fc15-4a2b-93ea-d915a2de0b4e@d32g2000yqe.googlegroups.com>
	<mailman.696.1235522481.11746.python-list@python.org>
Message-ID: <d3b164c0-9100-486e-a0fc-4afcbab53019@v13g2000yqm.googlegroups.com>

On Feb 24, 4:41?pm, Luis Zarrabeitia <ky... at uh.cu> wrote:
> On Tuesday 24 February 2009 07:12:36 pm Lionel wrote:
>
> > In a nutshell, what I need is a way to acquire the screen dimensions
> > (in pixels) and its dpi setting.
>
> This is a guess, and a guess only.
> What do you want to know it for? If it is for painting something on the
> screen, maybe (just maybe - I'm guessing here big time), whatever API you are
> using for painting can be used for getting the dimensions of the drawing
> device. I don't even know if GTK or Qt have that feature, but you should look
> into it. If the same api you will use for painting provides that
> functionality, then it would be kind of irrelevant if it is on the stdlib or
> not.
>
> Of course, this only applies if you want to paint and your api provides that
> info.
>
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matem?tica y Computaci?n, UH.http://profesores.matcom.uh.cu/~kyrie

Thanks for the responses so far, everyone. Luis you are indeed a good
guesser! I'm using wxPython/matplotlib and would like to size my
matplotlib data figure so that it assumes a 1:1 ratio on the screen
when embedded in a wxPython form. I'm playing with a 2D array with 320
rows and 177 columns and therefore would like to display the figure
with a size of 320x177 pixels. The problem is that the call to
instantiate the figure takes size parameters of inches and dpi! For
example:

matplotlib.figure.Figure((5,4), 75)

is a figure with width of 5 inches, height of 4 inches, and dpi of 75.
Thanks to Luis' comment I googled around and found that wxPython has
the following functions:

wx.GetDisplaySize()    # Get dimensions in pixels.
wx.GetDisplaySizeMM()  # Get dimensions in millimeters.

It's a little klunky to have a function that takes inches an an
argument and another that produces millimeters when querying the
display, no? Unless someone has a better idea I suppose I'll have to
convert between the two to display at 1:1.

-L

SInce I want my matplotlib.figure.Figure() to assume the exact pixel
dimensions of the 2D array,


From sjmachin at lexicon.net  Tue Feb 24 20:04:30 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 17:04:30 -0800 (PST)
Subject: =?windows-1252?B?UmU6ICd1JyBPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gKDc=?=
	=?windows-1252?B?KQ==?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
	<878wnvgxvg.fsf@benfinney.id.au>
Message-ID: <1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>

On Feb 25, 11:32?am, Ben Finney <bignose+hates-s... at benfinney.id.au>
wrote:
> John Machin <sjmac... at lexicon.net> writes:
> > On Feb 25, 9:06?am, Steven D'Aprano <st... at pearwood.info> wrote:
> > > I don't know what you want to report, but I've reported that obsolete is
> > > mispelled:
>
> > +1 Own Goal of the Year ... see
> > ?http://www.yourdictionary.com/library/misspelled.html
>
> Not so notable. It's merely one more incident of the law of
> communication variously known as McKean's Law, Skitt's Law, and
> Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.

Those incidents are mundane and ordinary IMHO compared with
misspelling both "misspelled" and "misspelling" in the bug report.



From steve at holdenweb.com  Tue Feb 24 20:22:29 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 20:22:29 -0500
Subject: pep 8 constants
In-Reply-To: <49A49644.80509@stoneleaf.us>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org> <49A49644.80509@stoneleaf.us>
Message-ID: <49A49D55.10705@holdenweb.com>

Ethan Furman wrote:
> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
>>> bockman at virgilio.it wrote:
>>>
>>>> Constants would be a nice addition in python, sure enough.
>>>> But I'm not sure that this can be done without a run-time check every
>>>> time
>>>> the constant is used, and python is already slow enough. Maybe a check
>>>> that is disabled when running with optimizing flags ?
>>>>
>>>> But I'm sure this discussion has been already made and the FINAL
>>>> WORD has
>>>> been already spoken.
>>>>
>>>> Ciao
>>>> ----
>>>> FB
>>>
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>
>> I don't understand why this would print 3.14159 ... instead of <function
>> __math__.pi>, or whatever.
>>
>> property would clearly have to do something very different in module
>> scope in order to make this work.
>>
>> regards
>>  Steve
> 
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
> 
> Looks like that's how property works, so the same behavior on a module
> level would do as Brian suggests.

But that's at the class level, not the module level.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb 24 22:15:33 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 22:15:33 -0500
Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
	=?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
In-Reply-To: <1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>	<01b464c4$0$18215$c3e8da3@news.astraweb.com>	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>	<878wnvgxvg.fsf@benfinney.id.au>
	<1aa8bdcf-993c-4a60-aadd-1319239885d8@v15g2000yqn.googlegroups.com>
Message-ID: <go2d4s$58r$2@ger.gmane.org>

John Machin wrote:
> On Feb 25, 11:32 am, Ben Finney <bignose+hates-s... at benfinney.id.au>
> wrote:
>> John Machin <sjmac... at lexicon.net> writes:
>>> On Feb 25, 9:06 am, Steven D'Aprano <st... at pearwood.info> wrote:
>>>> I don't know what you want to report, but I've reported that obsolete is
>>>> mispelled:
>>> +1 Own Goal of the Year ... see
>>>  http://www.yourdictionary.com/library/misspelled.html
>> Not so notable. It's merely one more incident of the law of
>> communication variously known as McKean's Law, Skitt's Law, and
>> Muphry's Law <URL:http://en.wikipedia.org/wiki/Muphry%27s_law>.
> 
> Those incidents are mundane and ordinary IMHO compared with
> misspelling both "misspelled" and "misspelling" in the bug report.
> 
I thought that was Ben's point.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From king.seth at gmail.com  Tue Feb 24 22:46:19 2009
From: king.seth at gmail.com (Seth)
Date: Tue, 24 Feb 2009 19:46:19 -0800 (PST)
Subject: Convert PySerial to python 3.0
Message-ID: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>

I am just messing around trying to get pyserial to work with 3.0.

I am stuck on this line:

if type(port) in [type(''), type(u'')]


how can I convert this to 3.0? I tried changing the u to a d that did
not do anything.

Thanks


From gagsl-py2 at yahoo.com.ar  Tue Feb 24 22:52:45 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 01:52:45 -0200
Subject: pep 8 constants
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it> <4978DD2E.1090008@aim.com>
	<glbc6v$9eh$1@ger.gmane.org> <49A49644.80509@stoneleaf.us>
Message-ID: <op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>

En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>  
escribi?:

> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>  I don't understand why this would print 3.14159 ... instead of  
>> <function
>> __math__.pi>, or whatever.
>>  property would clearly have to do something very different in module
>> scope in order to make this work.
>>  regards
>>  Steve
>
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
>
> Looks like that's how property works, so the same behavior on a module  
> level would do as Brian suggests.

Note that:
  - you defined the property inside the *class* tester
  - then, you created an *instance* of such class
  - you retrieve pi from the instance
  - if you retrieve pi from the class (tester.pi), you get a property  
object, not a float.
  - if you directly attach the property to the instance, testee.pi returns  
a property object, not a float.
Finally, consider that modules are instances of type `module`; all modules  
are instances of the same type.

How do you propose to make properties work at the module level?

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Feb 24 22:55:44 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 24 Feb 2009 19:55:44 -0800
Subject: Convert PySerial to python 3.0
In-Reply-To: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
Message-ID: <50697b2c0902241955i66452d48j6ff03b6cebec4cd@mail.gmail.com>

On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.seth at gmail.com> wrote:
> I am just messing around trying to get pyserial to work with 3.0.
>
> I am stuck on this line:
>
> if type(port) in [type(''), type(u'')]
>
>
> how can I convert this to 3.0? I tried changing the u to a d that did
> not do anything.

Looks like it's doing the equivalent of the pre-3.0-ism
`isinstance(port, basestring)`, but in a roundabout way.
However, since basestring doesn't exist in 3.0, either:

if isinstance(port, str):

Or

if isinstance(port, bytes):

would be the appropriate replacement. Depends (obviously) on whether
'port' is supposed to be unicode or a byte sequence.
Without more context, I can't really say which is what you want.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Tue Feb 24 22:57:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 22:57:50 -0500
Subject: pep 8 constants
In-Reply-To: <op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>
	<49A49644.80509@stoneleaf.us>
	<op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <go2fk5$bh6$1@ger.gmane.org>

Gabriel Genellina wrote:
> En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>
> escribi?:
> 
>> Steve Holden wrote:
>>> Brian Allen Vanderburg II wrote:
>>>
>>>> One idea to make constants possible would be to extend properties to be
>>>> able to exist at the module level as well as the class level:
>>>>
>>>> @property
>>>> def pi():
>>>>   return 3.14159.....
>>>>
>>>> print(pi) # prints 3.14159....
>>>> pi=32 # Raise an error Cannot set attribute ...
>>>>
>>>  I don't understand why this would print 3.14159 ... instead of
>>> <function
>>> __math__.pi>, or whatever.
>>>  property would clearly have to do something very different in module
>>> scope in order to make this work.
>>>  regards
>>>  Steve
>>
>> --> class tester(object):
>> ...   @property
>> ...   def pi(self):
>> ...     return 3.141596
>> ...
>> --> testee = tester()
>> --> testee.pi
>> 3.1415959999999998
>>
>> Looks like that's how property works, so the same behavior on a module
>> level would do as Brian suggests.
> 
> Note that:
>  - you defined the property inside the *class* tester
>  - then, you created an *instance* of such class
>  - you retrieve pi from the instance
>  - if you retrieve pi from the class (tester.pi), you get a property
> object, not a float.
>  - if you directly attach the property to the instance, testee.pi
> returns a property object, not a float.
> Finally, consider that modules are instances of type `module`; all
> modules are instances of the same type.
> 
> How do you propose to make properties work at the module level?
> 
Thanks, Gabriel. I was beginning to think there was something terribly
obvious I had completely missed.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Tue Feb 24 23:00:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 23:00:56 -0500
Subject: Convert PySerial to python 3.0
In-Reply-To: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
Message-ID: <go2fq0$bh6$2@ger.gmane.org>

Seth wrote:
> I am just messing around trying to get pyserial to work with 3.0.
> 
> I am stuck on this line:
> 
> if type(port) in [type(''), type(u'')]
> 
> 
> how can I convert this to 3.0? I tried changing the u to a d that did
> not do anything.
> 
How about

if type(port) in (str, bytes):

Untested.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve.ferg.bitbucket at gmail.com  Tue Feb 24 23:08:40 2009
From: steve.ferg.bitbucket at gmail.com (steve.ferg.bitbucket at gmail.com)
Date: Tue, 24 Feb 2009 20:08:40 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together on 
	same *WINDOWS* machine
Message-ID: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>

I'm looking for tips on installing and running Python version 2.6 and
version 3.0 together on same Windows machine.

I'd like to install both 2.6 and 3.0 together on the same Windows
(Vista) machine, so I can test programs under both versions.

Is it possible to install both versions on the same Windows machine in
such a way that they are both asily available and don't interfere with
one another?  I'm concerned, for example, that if I install both, the
second installation will over-write some Python entry in the registry.

I'd like something fairly simple -- I will be sharing this information
with others in my workgroup for whom  virtualenv is not an option.

I googled around, but couldn't find anything that seemed to address
this specific question.  If anybody knows of a URL with this
information (a "2 to 3 Conversion FAQs"?) that would be great.

Any help would be greatly appreciated.

-- Steve Ferg


From zaheer.agadi at gmail.com  Tue Feb 24 23:17:21 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Tue, 24 Feb 2009 20:17:21 -0800 (PST)
Subject: Is there any equivalent feature available in Python..?
References: <54d72142-963e-4be3-b11e-7b15c6a2ee58@m24g2000vbp.googlegroups.com>
	<mailman.684.1235506291.11746.python-list@python.org>
Message-ID: <5455a1b6-4e61-42fd-8088-5439732da1c6@g38g2000yqd.googlegroups.com>

On Feb 25, 1:10?am, Albert Hopkins <mar... at letterboxes.org> wrote:
> On Tue, 2009-02-24 at 11:05 -0800, zaheer.ag... at gmail.com wrote:
> > Hi,
>
> > Is there any Python equivalent of java jar,can I include all my
> > sources,properties file etc into a single file.Is there anyway in
> > Python that I can run like the following
>
> > java ?-jar Mytest.jar --startwebserver
>
> > How to so something like this in Python?
>
> Similar but not equal:
>
> $ tree mytest
> mytest
> |-- __init__.py
> `-- main.py
>
> $ cat mytest/__init__.py
> if __name__ == '__main__':
> ? ? import sys
> ? ? print sys.argv
> ? ? import mytest.main
>
> $ cat mytest/main.py
> print 'hi mom'
>
> $ zip -r mytest.zip mytest
> ? adding: mytest/ (stored 0%)
> ? adding: mytest/main.py (stored 0%)
> ? adding: mytest/__init__.py (deflated 4%)
>
> $ PYTHONPATH=mytest.zip python -m mytest --startserver
> [None, '--startserver']
> hi mom

Thanks A lot this should solve my problem.Just out of curiosity how is
Python eggs different from the zip file you created here


From venutaurus539 at gmail.com  Tue Feb 24 23:20:52 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 20:20:52 -0800 (PST)
Subject: Problem with os.system()
Message-ID: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>

Hello,
         I am facing problems while using os.system() of python for
copying a file from source to destination where the file name is in
unicode (multi lingual characters).My python interpreter is trying to
convert them to ascii and is failing. I tried giving unicode string as
input for the function something like:

c = u"copy "+"\""+full_path+"\" "+dest
os.system (c)

where the full_path contains filenames with unicode characters(unicode
data type). I tried searching in google and came to know that UNICODE
support wasn't there for os.system function till python2.3[1].
Currently I am using python2.6 but couldn't find anywhere whether a
support has been provided or not. Can some one suggest me any work
around for this. If I do a manual encoding of the file name to ascii,
it results in loss of data and hence the copy command wouldn't find
the file name.


---------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\unitest.py", line 32, in <module>
    findFile(u"E:\\New Folder")
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 27, in findFile
    os.system (c)
UnicodeEncodeError: 'ascii' codec can't encode characters in position
47-72: ordinal not in range(128)
------------------------------------------------------------------------------------------------------




[1] http://mail.python.org/pipermail/python-list/2003-January/182182.html





Thanks in advance,
Venu M


From grante at visi.com  Tue Feb 24 23:22:34 2009
From: grante at visi.com (Grant Edwards)
Date: Tue, 24 Feb 2009 22:22:34 -0600
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
Message-ID: <etidnbVIjawXWjnUnZ2dnUVZ_v7inZ2d@posted.usinternet>

On 2009-02-25, Chris Rebert <clp2 at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.seth at gmail.com> wrote:
>> I am just messing around trying to get pyserial to work with 3.0.
>>
>> I am stuck on this line:
>>
>> if type(port) in [type(''), type(u'')]
>>
>> how can I convert this to 3.0? I tried changing the u to a d that did
>> not do anything.
>
> Looks like it's doing the equivalent of the pre-3.0-ism
> `isinstance(port, basestring)`, but in a roundabout way.
> However, since basestring doesn't exist in 3.0, either:
>
> if isinstance(port, str):
>
> Or
>
> if isinstance(port, bytes):
>
> would be the appropriate replacement. Depends (obviously) on
> whether 'port' is supposed to be unicode or a byte sequence.

Port can either be an integer or a file/device name.

> Without more context, I can't really say which is what you
> want.

In the line of code in question, the conditional is inteded to
be true if "port" is someting that could be passed to the OS as
a file or device name.

-- 
Grant




From venutaurus539 at gmail.com  Tue Feb 24 23:22:47 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 20:22:47 -0800 (PST)
Subject: Problem with os.system()
Message-ID: <3c216f95-0cd9-43ec-91fa-090e9ad00fbc@e5g2000vbe.googlegroups.com>

Hello,
         I am facing problems while using os.system() of python for
copying a file from source to destination where the file name is in
unicode (multi lingual characters).My python interpreter is trying to
convert them to ascii and is failing. I tried giving unicode string as
input for the function something like:

c = u"copy "+"\""+full_path+"\" "+dest
os.system (c)

where the full_path contains filenames with unicode characters(unicode
data type). I tried searching in google and came to know that UNICODE
support wasn't there for os.system function till python2.3[1].
Currently I am using python2.6 but couldn't find anywhere whether a
support has been provided or not. Can some one suggest me any work
around for this. If I do a manual encoding of the file name to ascii,
it results in loss of data and hence the copy command wouldn't find
the file name.


---------------------------------------------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\unitest.py", line 32, in <module>
    findFile(u"E:\\New Folder")
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 17, in findFile
    findFile(full_path)
  File "C:\unitest.py", line 27, in findFile
    os.system (c)
UnicodeEncodeError: 'ascii' codec can't encode characters in position
47-72: ordinal not in range(128)
------------------------------------------------------------------------------------------------------




[1] http://mail.python.org/pipermail/python-list/2003-January/182182.html





Thanks in advance,
Venu M


From david.birdsong at gmail.com  Tue Feb 24 23:25:14 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 20:25:14 -0800 (PST)
Subject: single thread decrement a semaphore object more than once?
Message-ID: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>

I searched but didn't see this already discussed, sorry if I didn't
search hard enough.

Can I decrement a semaphore's counter within the same thread more than
once?  I'd like to set hard and soft limits in a server I'm writing.
The server upon initialization would create a semaphore:

threading.Semaphore(100)

Then acquire 50x to hold half of the locks before serving any
requests.  This allows me to grow the number of locks to the hard
limit via signals or some other mechanism, but I need to know that any
1 thread has the ability to acquire up or release more than 1x and
effectively acquire and release for that number of semaphore values.

I could implement this by using regular threading.Lock in a pool, but
the Semaphore object would be much easier.


From girish.cfc at gmail.com  Tue Feb 24 23:50:20 2009
From: girish.cfc at gmail.com (Girish)
Date: Tue, 24 Feb 2009 20:50:20 -0800 (PST)
Subject: XML Parsing
Message-ID: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>

Hello,

I have a xml file which is as follows:

    <pids>
        <Parameter_Class>
            <Parameter Id="pid_031605_093137_283">
                <Identifier>$0000</Identifier>
                <Type>PID</Type>
                <Signal><![CDATA[Parameter Identifiers Supported - $01
to $20]]></Signal>
                <Description><![CDATA[This PID indicates which
legislated PIDs]]></Description>
                 ..............
                 ...............

Can anyone please tell me how to get content of <Signal> tag.. that
is, how to extract the data "![CDATA[Parameter Identifiers Supported -
$01 to $20]]"

Thanks,
Girish...


From steve at holdenweb.com  Tue Feb 24 23:51:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 24 Feb 2009 23:51:41 -0500
Subject: Looking for tips on running Python version 2.6 and 3.0 together
	on    same *WINDOWS* machine
In-Reply-To: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
Message-ID: <49A4CE5D.60702@holdenweb.com>

steve.ferg.bitbucket at gmail.com wrote:
> I'm looking for tips on installing and running Python version 2.6 and
> version 3.0 together on same Windows machine.
> 
> I'd like to install both 2.6 and 3.0 together on the same Windows
> (Vista) machine, so I can test programs under both versions.
> 
> Is it possible to install both versions on the same Windows machine in
> such a way that they are both asily available and don't interfere with
> one another?  I'm concerned, for example, that if I install both, the
> second installation will over-write some Python entry in the registry.
> 
> I'd like something fairly simple -- I will be sharing this information
> with others in my workgroup for whom  virtualenv is not an option.
> 
> I googled around, but couldn't find anything that seemed to address
> this specific question.  If anybody knows of a URL with this
> information (a "2 to 3 Conversion FAQs"?) that would be great.
> 
> Any help would be greatly appreciated.
> 
It's easy - the registry isn't used except to associate files. The
associations are made with the most-recently-installed version.

I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lists at cheimes.de  Tue Feb 24 23:55:34 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 05:55:34 +0100
Subject: Problem with os.system()
In-Reply-To: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
References: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
Message-ID: <go2j06$iv8$1@ger.gmane.org>

venutaurus539 at gmail.com schrieb:
> Hello,
>          I am facing problems while using os.system() of python for
> copying a file from source to destination where the file name is in
> unicode (multi lingual characters).My python interpreter is trying to
> convert them to ascii and is failing. I tried giving unicode string as
> input for the function something like:
> 
> c = u"copy "+"\""+full_path+"\" "+dest
> os.system (c)

First of all do not use os.system() to run external programs. You'll get
in all sorts of trouble like quoting. You are far better of with the
subprocess module.

Second, why are you using an external program at all? The shutil module
contains multiple functions to copy a file or directory.

import shutil
shutil.copy(source, dest)

Christian



From lists at cheimes.de  Tue Feb 24 23:57:43 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 05:57:43 +0100
Subject: single thread decrement a semaphore object more than once?
In-Reply-To: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
References: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
Message-ID: <go2j47$iv8$2@ger.gmane.org>

birdsong wrote:
> I searched but didn't see this already discussed, sorry if I didn't
> search hard enough.
> 
> Can I decrement a semaphore's counter within the same thread more than
> once?  I'd like to set hard and soft limits in a server I'm writing.
> The server upon initialization would create a semaphore:
> 
> threading.Semaphore(100)

Yes, you are not restricted to multiple threads. A semaphore ensures
that the counter is thread safe. It doesn't force you to use threads.

Christian



From martin at v.loewis.de  Wed Feb 25 00:20:11 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 25 Feb 2009 06:20:11 +0100
Subject: Looking for tips on running Python version 2.6 and 3.0 together
	on    same *WINDOWS* machine
In-Reply-To: <mailman.707.1235537518.11746.python-list@python.org>
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
	<mailman.707.1235537518.11746.python-list@python.org>
Message-ID: <49A4D50B.4030803@v.loewis.de>

> It's easy - the registry isn't used except to associate files. The
> associations are made with the most-recently-installed version.
> 
> I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.

In addition, at install time, there is the choice of not creating
associations (i.e. links what interpreter should be invoked if you
double-click a .py file, and what version of IDLE should start
when you select Edit from the context menu).

So if you install 2.6 first, then 3.0, but deselect the installation
of associations, 2.6 will continue to be associated with the
.py, .pyw, and .pyc extensions.

Regards,
Martin


From venutaurus539 at gmail.com  Wed Feb 25 00:28:27 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 21:28:27 -0800 (PST)
Subject: Problem with os.system()
References: <452516e1-3708-4d82-aa8c-907169b985e3@v15g2000yqn.googlegroups.com>
	<mailman.708.1235537747.11746.python-list@python.org>
Message-ID: <5e5e1d83-4950-42e9-bf1d-51fa6ff5eeaa@d19g2000yqb.googlegroups.com>

On Feb 25, 9:55?am, Christian Heimes <li... at cheimes.de> wrote:
> venutaurus... at gmail.com schrieb:
>
> > Hello,
> > ? ? ? ? ?I am facing problems while using os.system() of python for
> > copying a file from source to destination where the file name is in
> > unicode (multi lingual characters).My python interpreter is trying to
> > convert them to ascii and is failing. I tried giving unicode string as
> > input for the function something like:
>
> > c = u"copy "+"\""+full_path+"\" "+dest
> > os.system (c)
>
> First of all do not use os.system() to run external programs. You'll get
> in all sorts of trouble like quoting. You are far better of with the
> subprocess module.
>
> Second, why are you using an external program at all? The shutil module
> contains multiple functions to copy a file or directory.
>
> import shutil
> shutil.copy(source, dest)
>
> Christian

Thanks Christian for your reply,will definitely try.


From wuwei23 at gmail.com  Wed Feb 25 00:38:35 2009
From: wuwei23 at gmail.com (alex23)
Date: Tue, 24 Feb 2009 21:38:35 -0800 (PST)
Subject: XML Parsing
References: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>
Message-ID: <660eae9c-c46a-407d-8e35-b18e2915a3fe@p20g2000yqi.googlegroups.com>

On Feb 25, 2:50?pm, Girish <girish.... at gmail.com> wrote:
> Can anyone please tell me how to get content of <Signal> tag.. that
> is, how to extract the data "![CDATA[Parameter Identifiers Supported -
> $01 to $20]]"

Was there something in particular about Jean-Paul Calderone's solution
that didn't satisfy you? http://tinyurl.com/azgo5j




From lie.1296 at gmail.com  Wed Feb 25 00:43:47 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 05:43:47 +0000 (UTC)
Subject: XML Parsing
References: <3766830b-b0fb-45b7-a227-56244ed84bd6@v15g2000yqn.googlegroups.com>
Message-ID: <go2lqj$cco$4@ger.gmane.org>

On Tue, 24 Feb 2009 20:50:20 -0800, Girish wrote:

> Hello,
> 
> I have a xml file which is as follows:
> 
>     <pids>
>         <Parameter_Class>
>             <Parameter Id="pid_031605_093137_283">
>                 <Identifier>$0000</Identifier>
>                 <Type>PID</Type>
>                 <Signal><![CDATA[Parameter Identifiers Supported - $01
> to $20]]></Signal>
>                 <Description><![CDATA[This PID indicates which
> legislated PIDs]]></Description>
>                  ..............
>                  ...............
> 
> Can anyone please tell me how to get content of <Signal> tag.. that is,
> how to extract the data "![CDATA[Parameter Identifiers Supported - $01
> to $20]]"
> 
> Thanks,
> Girish...

The easy one is to use re module (Regular expression). 

# untested
import re
signal_pattern = re.compile('<Signal>(.*)</Signal>')
signals = signal_pattern.findall(xmlstring)

also, you may also use the xml module, which will be more reliable if you 
have data like this: <foo attr="<Signal>blooo</Signal>">blah</foo>,

>>> import xml.dom.minidom
>>> xmldata = xml.dom.minidom.parse(open('myfile.xml'))
>>> for node in xmldata.getElementsByTagName('Signal'): print node.toxml()
... 



From janandith at gmail.com  Wed Feb 25 00:54:49 2009
From: janandith at gmail.com (janandith jayawardena)
Date: Wed, 25 Feb 2009 11:24:49 +0530
Subject: Is there a way to increase memory allocated to the python interpreter
Message-ID: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>

Hi,

Is there a way to configure the amount of memory allocated to the python
interpreter.  Can it be increased or decreased using an argument like in the
Java Virtual Machine.

thanks,
Janandith.
-------------- next part --------------
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From ssalam at gmail.com  Wed Feb 25 00:55:21 2009
From: ssalam at gmail.com (Shah Sultan Alam)
Date: Wed, 25 Feb 2009 11:25:21 +0530
Subject: Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
Message-ID: <ef4dfd280902242155q61c988dbiecd043534e15004e@mail.gmail.com>

Hi Groups,
 Can you please help me on the following...

1. Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4

2. If yes, what is the exact 'yum' command to install paramiko on CentOS 4?
I have tried all possible ones without success.

        yum install paramiko
        yum install python-paramiko(with and without version numbers)
        python-paramiko.noarch

Installing it without yum throws dependency problems which are never
ending : starting with python-crypto and python(abi) - which I am
unable to find.

Is there any change that has to be made to the yum repository to point
it to look in a different place?

3. Alternatively, I also have apt-get on the CentOS box - can you tell
me some repos that I can add for apt-get as well?



Regds
Shah


From hrishys at yahoo.co.uk  Wed Feb 25 01:09:25 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 06:09:25 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <go2lqj$cco$4@ger.gmane.org>
Message-ID: <498059.69062.qm@web27404.mail.ukl.yahoo.com>

Hi 

I am just a python enthusiast and not a python user but was just wundering why didnt the list members come up with or recommen XPATH based solution
which i think is very elegant for this type of a problem isnt it ?

regards
Hrishy



--- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:

> From: Lie Ryan <lie.1296 at gmail.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 5:43 AM
> On Tue, 24 Feb 2009 20:50:20 -0800, Girish wrote:
> 
> > Hello,
> > 
> > I have a xml file which is as follows:
> > 
> >     <pids>
> >         <Parameter_Class>
> >             <Parameter
> Id="pid_031605_093137_283">
> >                
> <Identifier>$0000</Identifier>
> >                 <Type>PID</Type>
> >                 <Signal><![CDATA[Parameter
> Identifiers Supported - $01
> > to $20]]></Signal>
> >                 <Description><![CDATA[This
> PID indicates which
> > legislated PIDs]]></Description>
> >                  ..............
> >                  ...............
> > 
> > Can anyone please tell me how to get content of
> <Signal> tag.. that is,
> > how to extract the data "![CDATA[Parameter
> Identifiers Supported - $01
> > to $20]]"
> > 
> > Thanks,
> > Girish...
> 
> The easy one is to use re module (Regular expression). 
> 
> # untested
> import re
> signal_pattern =
> re.compile('<Signal>(.*)</Signal>')
> signals = signal_pattern.findall(xmlstring)
> 
> also, you may also use the xml module, which will be more
> reliable if you 
> have data like this: <foo
> attr="<Signal>blooo</Signal>">blah</foo>,
> 
> >>> import xml.dom.minidom
> >>> xmldata =
> xml.dom.minidom.parse(open('myfile.xml'))
> >>> for node in
> xmldata.getElementsByTagName('Signal'): print
> node.toxml()
> ... 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From jason.scheirer at gmail.com  Wed Feb 25 01:38:48 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 22:38:48 -0800 (PST)
Subject: Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
References: <mailman.712.1235541324.11746.python-list@python.org>
Message-ID: <134f4359-2b76-4295-aaeb-191c937fc515@l16g2000yqo.googlegroups.com>

On Feb 25, 12:55?am, Shah Sultan Alam <ssa... at gmail.com> wrote:
> Hi Groups,
> ?Can you please help me on the following...
>
> 1. Does Paramiko 1.7.2 and 1.6.4 work with CentOS 4
>
> 2. If yes, what is the exact 'yum' command to install paramiko on CentOS 4?
> I have tried all possible ones without success.
>
> ? ? ? ? yum install paramiko
> ? ? ? ? yum install python-paramiko(with and without version numbers)
> ? ? ? ? python-paramiko.noarch
>
> Installing it without yum throws dependency problems which are never
> ending : starting with python-crypto and python(abi) - which I am
> unable to find.
>
> Is there any change that has to be made to the yum repository to point
> it to look in a different place?
>
> 3. Alternatively, I also have apt-get on the CentOS box - can you tell
> me some repos that I can add for apt-get as well?
>
> Regds
> Shah

This may be a question better directed at the CentOS mailing list as I
doubt anyone here is a CentOS package maintainer for paramiko. You're
going to need to build it yourself if it's not in yum. Make sure you
have the python development headers installed, and issue the commands:

wget http://www.lag.net/paramiko/download/paramiko-1.7.4.tar.gz
tar xzf paramiko-1.7.4.tar.gz
cd paramiko-1.7.4
python setup.py build
su -c "python setup.py install"

Alternately, you can issue

python setup.py bdist_rpm

to get an RPM you can install on other machines as well (it will show
up in the ./dist/ directory relative to setup.py). Good luck.


From lie.1296 at gmail.com  Wed Feb 25 01:48:30 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 17:48:30 +1100
Subject: XML Parsing
In-Reply-To: <498059.69062.qm@web27404.mail.ukl.yahoo.com>
References: <498059.69062.qm@web27404.mail.ukl.yahoo.com>
Message-ID: <1235544510.6745.8.camel@lieryan-laptop>

On Wed, 2009-02-25 at 06:09 +0000, hrishy wrote:
> Hi 
> 
> I am just a python enthusiast and not a python user but was just wundering why didnt the list members come up with or recommen XPATH based solution
> which i think is very elegant for this type of a problem isnt it ?

Did you mean XQuery?

Depending on the need, XQuery might be an overkill. And don't forget
that XQuery is still an obscure, unknown language for most people (the
de facto standard for querying is still SQL).



From jason.scheirer at gmail.com  Wed Feb 25 01:49:19 2009
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Tue, 24 Feb 2009 22:49:19 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together 
	on same *WINDOWS* machine
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
	<mailman.707.1235537518.11746.python-list@python.org>
	<49A4D50B.4030803@v.loewis.de>
Message-ID: <61420eb1-c8a6-4651-b8f0-83b9de81a749@q9g2000yqc.googlegroups.com>

On Feb 24, 9:20?pm, "Martin v. L?wis" <mar... at v.loewis.de> wrote:
> > It's easy - the registry isn't used except to associate files. The
> > associations are made with the most-recently-installed version.
>
> > I currently have 2.4, 2.5, 2.6 and 3.0 on my Windows machine.
>
> In addition, at install time, there is the choice of not creating
> associations (i.e. links what interpreter should be invoked if you
> double-click a .py file, and what version of IDLE should start
> when you select Edit from the context menu).
>
> So if you install 2.6 first, then 3.0, but deselect the installation
> of associations, 2.6 will continue to be associated with the
> .py, .pyw, and .pyc extensions.
>
> Regards,
> Martin

Technically not true. Python DOES use the registry, but it's per-
version and isolated from each other. Each installs some configuration
data in HKEY_LOCAL_MACHINE\\Software\Python\PythonCore\MAJOR.MINOR, so
you'll have stuff in HKLM\\Software\Python\PythonCore\2.6 and HKLM\
\Software\Python\PythonCore\3.0. And yes, this DOES mean you can't
have 2.6 and 2.6.1 cleanly installed on the machine at the same time.

As long as you keep your .py and .pyw files associated with the
preferred Python interpreter (2.6 I'm assuming) and EXPLICTLY call C:
\Python30\Python.exe when you want to run on 3.0, you're golden.


From venutaurus539 at gmail.com  Wed Feb 25 02:10:37 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Tue, 24 Feb 2009 23:10:37 -0800 (PST)
Subject: Finding the attributes of a file
Message-ID: <08b7c6a1-0de0-4aa7-b1c7-6fb30013aa5d@e24g2000vbe.googlegroups.com>

Hello all,
           I am writing an application which has to identify the
archived files in a given directory.I've tried using the function
i = win32api.GetFileAttributes (full_path)

to obtain the attributes.But am unable to identify based on the value
it returns as it is returning 5152, 13856 etc for different files but
all of them are archived. Is there any way to come to a conclusion
using these numbers about whether a file is archived or not.

Thanks in advance,
Venu



From hrishys at yahoo.co.uk  Wed Feb 25 02:17:30 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 07:17:30 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <1235544510.6745.8.camel@lieryan-laptop>
Message-ID: <574132.90483.qm@web27405.mail.ukl.yahoo.com>

Hi 

Something like this

<pids
  <Parameter_Class
    <ParameterId="pid_031605_093137_283"             
    <Identifier$0000</Identifier
    <TypePID</Type
    <Signal<![CDATA[Parameter
 		Identifiers Supported - $01
  		to $20]]</Signal
   <Description<![CDATA[This PID indicates which
  legislated PIDs]]
   </Description

from elementtree.ElementTree import ElementTree
doc = ElementTree(file='tst.xml')
for e in mydata.findall('/pids//signal'):
    print e.get('title').text

Note i am not a python programmer just a enthusiast and i was curious why people on the list didnt suggest a code like above

willing to hear and learn from experienced python gurus

regards
Hrishy


      


From mail at microcorp.co.za  Wed Feb 25 02:19:43 2009
From: mail at microcorp.co.za (Hendrik van Rooyen)
Date: Wed, 25 Feb 2009 09:19:43 +0200
Subject: Python AppStore / Marketplace
References: <a7898031-be46-4901-89e7-3cf6e285ab00@t13g2000yqc.googlegroups.com><gnrn0o$4ju$1@ger.gmane.org>
	<49A311C3.80707@gmail.com><gnv6vs$bm7$1@ger.gmane.org>
	<op.uptzhjvya8ncjz@gnudebst>
Message-ID: <00c101c9971c$8f1709e0$0d00a8c0@hendrik>

"Rhodri James" <rh..i at wi......mon.co.uk> wrote:

> A souq is a bazaar :-)
> 
> Well, close enough anyway.  It's another arabic word that translates as
> "market" in both the mercantile and financial senses, I believe.  Maybe
> I've just read too much arabic-themed fiction, but I was surprised not
> to find the word in my trusty Chambers.

I seem to remember seeing the word being variously spelled "suq" 
and/or "suk".

- Hendrik




From lie.1296 at gmail.com  Wed Feb 25 02:33:14 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 25 Feb 2009 07:33:14 +0000 (UTC)
Subject: XML Parsing
References: <1235544510.6745.8.camel@lieryan-laptop>
	<574132.90483.qm@web27405.mail.ukl.yahoo.com>
Message-ID: <go2s7q$1e1$1@ger.gmane.org>

Are you searching for answer or searching for another people that have 
the same answer as you? :)

"Many roads lead to Rome" is a very famous quotation...



From gregory.matous at gmail.com  Wed Feb 25 02:34:21 2009
From: gregory.matous at gmail.com (Dutch Masters)
Date: Tue, 24 Feb 2009 23:34:21 -0800 (PST)
Subject: Looking for tips on running Python version 2.6 and 3.0 together 
	on same *WINDOWS* machine
References: <ab843290-ab6a-41e6-aa4d-daab878e4c16@u1g2000vbb.googlegroups.com>
Message-ID: <18b6c7ce-02db-498b-886d-0b811fb51e2e@v13g2000vbb.googlegroups.com>

There is some documentation on the subject at:

http://docs.python.org/using/windows.html

In general, there are several options in maintaining separate
environments:

1) Create a separate user for each environment. This allows you to
keep things such as Path and file associations so that you are
selecting a certain install whenever you are logged in as that user.
This may NOT be an option on Vista though. The Python installer will
tell you whether you can install for only the current user.

2) Use batch scripts to setup your PATH and PYTHONPATH. This will not
solve the file association problem, but you can probably set up your
"SEND TO" folder to handle the different versions.

3) Use something like virtualenv.

I'm using option 2).

A couple more hints: if you are using a windows installer for a third-
party lib, (like wxpython), the installer will look in the registry
for a matching python installation. If there isn't one, it shouldn't
be a problem, just install it where it needs to go. (in the
appropriate Python folder).

You can also use the repair option for the python installer to get the
registry set up for a particular install. For example, if you
installed Python 3, but want to then use associations with 2.6, just
use repair with the 2.6 installer. (Not sure what else repair does
though)

Finally, you can use the --prefix option to setup.py to get installs
to go where you want on win.




From sjmachin at lexicon.net  Wed Feb 25 02:37:24 2009
From: sjmachin at lexicon.net (John Machin)
Date: Tue, 24 Feb 2009 23:37:24 -0800 (PST)
Subject: Finding the attributes of a file
References: <08b7c6a1-0de0-4aa7-b1c7-6fb30013aa5d@e24g2000vbe.googlegroups.com>
Message-ID: <8d4fef20-97d2-4e6b-82aa-fbb125ae41b8@h5g2000yqh.googlegroups.com>

On Feb 25, 6:10?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> Hello all,
> ? ? ? ? ? ?I am writing an application which has to identify the
> archived files in a given directory.I've tried using the function
> i = win32api.GetFileAttributes (full_path)
>
> to obtain the attributes.But am unable to identify based on the value
> it returns as it is returning 5152, 13856 etc for different files but
> all of them are archived. Is there any way to come to a conclusion
> using these numbers about whether a file is archived or not.

Two questions:
(1) What didn't you understand on the MSDN page that comes up when you
fed "GetFileAttributes" into your googler and selected the first hit?

"""
The attributes can be one or more of the following values.
Return code/value	Description

[... and the very first one is ...]

FILE_ATTRIBUTE_ARCHIVE
320x20

A file or directory that is an archive file or directory.

Applications use this attribute to mark files for backup or removal.
"""

Sure it slows you down slightly by having to mentally insert the
missing space in "320x20", but sheeeeesh it's not that hard to find.

(2) Where did you get the idea that this bit means archivED (i.e
completed, past tense)? AFAIK it's always been documented the MSDN
page says, with a hopeful or future-tense meaning. Of course as long
as the setters of the bit and the getters of the bit are using the
same protocol, it's not a problem ... could be a bit of a problem
ensuring you know who all the getters and setters are, and ensuring
that they are under your control.

HTH,

John


From venutaurus539 at gmail.com  Wed Feb 25 02:40:22 2009
From: venutaurus539 at gmail.com (venu madhav)
Date: Wed, 25 Feb 2009 13:10:22 +0530
Subject: Problem in identifying an archived file in Windows
Message-ID: <daf1e02e0902242340ue410fa3oabb4c927d20872a5@mail.gmail.com>

Hello all,
           I am writing an application which has to identify the
archived files in a given directory.I've tried using the function
i = win32api.GetFileAttributes (full_path)

to obtain the attributes.But am unable to identify based on the value
it returns as it is returning 5152, 13856 etc for different files but
all of them are archived. Is there any way to come to a conclusion
using these numbers about whether a file is archived or not.

Thanks in advance,
Venu
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From kom2 at centrum.cz  Wed Feb 25 02:50:27 2009
From: kom2 at centrum.cz (Kom2)
Date: Tue, 24 Feb 2009 23:50:27 -0800 (PST)
Subject: Running script in module initialization
References: <56d0c8e4-c7cd-4b3b-aef0-7dc92996efb3@m15g2000vbp.googlegroups.com>
	<mailman.356.1235143691.11746.python-list@python.org>
	<73cffb49-642a-4d6f-8c28-cc0ee5bb738b@z1g2000yqn.googlegroups.com>
	<mailman.666.1235485570.11746.python-list@python.org>
Message-ID: <6706d803-243d-4e28-8ef0-9aa37b59c0b6@o11g2000yql.googlegroups.com>

On 24 ?n, 15:25, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 23 Feb 2009 05:51:27 -0200, Kom2 <k... at centrum.cz> escribi?:
>
>
>
> > On 20 ?n, 16:27, Steve Holden <st... at holdenweb.com> wrote:
> >> Kom2 wrote:
> >> > Hello,
> >> > I'm trying to convert my project from python 2.5 to python 3.0 and I
> >> > have the following problem. My project is PYD library written in C++.
> >> > So I have this PyInit_ModuleName function containing PyModule_Create
> >> > call and this function also call some script with declarations:
>
> >> > ? ?PyObject* m;
>
> >> > ? ?m = PyModule_Create(&PyVRDAModule);
> >> > ? ?if (m == NULL) {
> >> > ? ? ? return NULL;
> >> > ? ?}
> >> > ? ?PyObject *d, *v;
> >> > ? ?d = PyModule_GetDict(m);
> >> > ? ?v = PyRun_StringFlags(txtPyPredefinedConstants), Py_file_input, d,
> >> > d, NULL);
> >> > ? ?......
>
> >> > txtPyPredefinedConstants is string with this content:
>
> >> > class CursorMoveType:
> >> > ? ?First = 0
> >> > ? ?Last = 1
> >> > ? ?Next = 2
> >> > ? ?Previous = 3
> >> > ? ?Bookmark = 4
> >> > ? ?NewRecord = 5
>
> >> > In Python 2.5 everything works fine, now in python3.0
> >> > PyRun_StringFlags returns NULL and I get error "__build_class__ not
> >> > found".
>
> __build_class__ is a (hidden?) function in the builtins module.
> Your module isn't completely created yet, it lacks the __builtins__ ?
> attribute, so you can't execute any Python code that calls a builtin ?
> function. In 2.5 the class statement was a lot simpler, but in 3.0 it ?
> requires an auxiliary function (implemented as builtins.__build_class__)
> You may try setting __builtins__ to the current builtins ?
> (PyEval_GetBuiltins) before executing Python code.
> Or, if those 7 lines are all you need, you may just write the equivalent C ?
> code.
>
> --
> Gabriel Genellina

Thanks for answer, calling PyEval_GetBuiltins could also help.
I solved this issue by getting dictionary of __main__ module as global
dictionary -

   d = PyModule_GetDict(m);
   PyObject* glMod = PyImport_AddModule("__main__");
   if (glMod == NULL) {
      return NULL;
   }
   PyObject* glDict = PyModule_GetDict(glMod);
   v = PyRun_StringFlags(txtPyPredefinedConstants, Py_file_input,
glDict, d, NULL);

- and it works.


From steven at REMOVE.THIS.cybersource.com.au  Wed Feb 25 02:50:49 2009
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Feb 2009 07:50:49 GMT
Subject: =?windows-1251?q?Re=3A_'u'__Obselete_type_=96?= it is identical to
	'd'.  (7)
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
	<f20d74b7-2785-47e9-ba22-3ed1b20a04ec@x9g2000yqk.googlegroups.com>
Message-ID: <pan.2009.02.25.07.50.50@REMOVE.THIS.cybersource.com.au>

On Tue, 24 Feb 2009 15:04:05 -0800, John Machin wrote:


>> I don't know what you want to report, but I've reported that obsolete
>> is mispelled:
>>
>> http://bugs.python.org/issue5361
> 
> +1 Own Goal of the Year ... see
>  http://www.yourdictionary.com/library/misspelled.html

Oh come on, it's hardly the Own Goal of the Year if it's in the (quote) 
"100 Most Often Misspelled Words in English". A notable own goal would be 
if I misspelled my own name or something. What I did was a run-of-the-
mill ordinary own goal, hardly worth even noting.

Besides, it's just the Time Machine in action. Come back in 10 years, and 
I bet "mispelled" will be accepted as a legitimate variant, just like 
inflammable/flammable, and in another 20 years, it will be the preferred 
spelling. The process is well on the way according to Google:

Results 1 - 10 of about 4,850,000 for mispelled
Results 1 - 10 of about 4,560,000 for misspelled



Typo'ly y'rs - Stveen

*wink*


From david.birdsong at gmail.com  Wed Feb 25 02:52:23 2009
From: david.birdsong at gmail.com (birdsong)
Date: Tue, 24 Feb 2009 23:52:23 -0800 (PST)
Subject: single thread decrement a semaphore object more than once?
References: <f91cf1c4-409a-4e29-a055-57bb212d8363@33g2000yqm.googlegroups.com>
	<mailman.709.1235538009.11746.python-list@python.org>
Message-ID: <11e41a9d-11be-4708-b47c-553ccab2e08d@t13g2000yqc.googlegroups.com>

On Feb 24, 8:57?pm, Christian Heimes <li... at cheimes.de> wrote:
> birdsong wrote:
> > I searched but didn't see this already discussed, sorry if I didn't
> > search hard enough.
>
> > Can I decrement a semaphore's counter within the same thread more than
> > once? ?I'd like to set hard and soft limits in a server I'm writing.
> > The server upon initialization would create a semaphore:
>
> > threading.Semaphore(100)
>
> Yes, you are not restricted to multiple threads. A semaphore ensures
> that the counter is thread safe. It doesn't force you to use threads.
>
> Christian

ahh good. there will be multiple threads accessing, but yes i follow
now.  i guess this would have been pretty easy to test in the shell.

muchas gracias.


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 03:19:19 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 06:19:19 -0200
Subject: Problem in identifying an archived file in Windows
References: <daf1e02e0902242340ue410fa3oabb4c927d20872a5@mail.gmail.com>
Message-ID: <op.upweqhnpx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 05:40:22 -0200, venu madhav <venutaurus539 at gmail.com>  
escribi?:

>            I am writing an application which has to identify the
> archived files in a given directory.I've tried using the function
> i = win32api.GetFileAttributes (full_path)
>
> to obtain the attributes.But am unable to identify based on the value
> it returns as it is returning 5152, 13856 etc for different files but
> all of them are archived. Is there any way to come to a conclusion
> using these numbers about whether a file is archived or not.

So you're using the pywin32 package. It comes with a help file  
(PyWin32.chm), you can open it right from the menu: Start, All Programs,  
Python XX, Python for Windows documentation.
Go to the GetFileAttributes topic. It says "The return value is a  
combination of the win32con.FILE_ATTRIBUTE_* constants". Ok, which  
constants? Let Python tell us:

py> import win32con
py> [name for name in dir(win32con) if name.startswith("FILE_ATTRIBUTE_")]
['FILE_ATTRIBUTE_ARCHIVE', 'FILE_ATTRIBUTE_ATOMIC_WRITE',  
'FILE_ATTRIBUTE_COMPRESSED', 'FILE_ATTRIBUTE_DIRECTORY',  
'FILE_ATTRIBUTE_HIDDEN', 'FILE_ATTRIBUTE_NORMAL',  
'FILE_ATTRIBUTE_READONLY','FILE_ATTRIBUTE_SYSTEM',  
'FILE_ATTRIBUTE_TEMPORARY', 'FILE_ATTRIBUTE_XACTION_WRITE']

What do they mean? The best source is the Microsoft site. There is a very  
convenient link in the help topic: "Search for GetFileAttributes at msdn,  
google or google groups." Click on msdn, the first result is  
<http://msdn.microsoft.com/en-us/library/aa364944(VS.85).aspx>
You apparently are looking for FILE_ATTRIBUTE_ARCHIVE.

-- 
Gabriel Genellina



From hrishys at yahoo.co.uk  Wed Feb 25 03:20:20 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Wed, 25 Feb 2009 08:20:20 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <go2s7q$1e1$1@ger.gmane.org>
Message-ID: <581368.29674.qm@web27405.mail.ukl.yahoo.com>

Hi Lie

I am not a python guy but very interested in the langauge and i consider the people on this list to be intelligent and was wundering why you people did not suggest xpath for this kind of a problem just curious and willing to learn.

I am searching for a answer but the question is 
why not use xpath to extract xml text from a xml doc ?

regards
Hrishy


--- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:

> From: Lie Ryan <lie.1296 at gmail.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 7:33 AM
> Are you searching for answer or searching for another people
> that have 
> the same answer as you? :)
> 
> "Many roads lead to Rome" is a very famous
> quotation...
> 
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 03:45:23 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 09:45:23 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.7174.1231915778.3487.python-list@python.org>
References: <mailman.7174.1231915778.3487.python-list@python.org>
Message-ID: <49a50517$0$3567$426a74cc@news.free.fr>

Brendan Miller a ?crit :
> PEP 8 doesn't mention anything about using all caps to indicate a constant.
> 
> Is all caps meaning "don't reassign this var" a strong enough
> convention to not be considered violating good python style? I see a
> lot of people using it, but I also see a lot of people writing
> non-pythonic code... so I thought I'd see what the consensus is.

Most - if not all - of the python code I've seen so far used this 
convention, and I always used (and respected) it myself.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 03:48:27 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 09:48:27 +0100
Subject: pep 8 constants
In-Reply-To: <87fxje4lqh.fsf@benfinney.id.au>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7578.1232421082.3487.python-list@python.org>
	<pan.2009.01.20.04.03.05@REMOVE.THIS.cybersource.com.au>
	<87fxje4lqh.fsf@benfinney.id.au>
Message-ID: <49a505cf$0$3567$426a74cc@news.free.fr>

Ben Finney a ?crit :
(snip - about using ALL_CAPS for pseudo-constants)
> Perhaps I'd even
> argue for an update to PEP 8 that endorses this as conventional.

+1

I've been a bit surprised last time I checked PEP8 to find out this 
wasn't already the case - I would have sweared it was.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 04:03:17 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 10:03:17 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.7757.1232658369.3487.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7757.1232658369.3487.python-list@python.org>
Message-ID: <49a50949$0$3556$426a34cc@news.free.fr>

Brian Allen Vanderburg II a ?crit :
> bockman at virgilio.it wrote:
>> Constants would be a nice addition in python, sure enough.
>> But I'm not sure that this can be done without a run-time check every 
>> time
>> the constant is used, and python is already slow enough. Maybe a check
>> that is disabled when running with optimizing flags ?
>>
>> But I'm sure this discussion has been already made and the FINAL WORD has
>> been already spoken.
>>
>>   
> One idea to make constants possible would be to extend properties to be 
> able to exist at the module level as well as the class level:
> 
> @property
> def pi():
>    return 3.14159.....
> 
> print(pi) # prints 3.14159....
> pi=32 # Raise an error Cannot set attribute ...
> 

There are a couple problems with this suggestion:

- it would require modifying lookup rules to allow the protocol 
descriptor to be invoked on instance attributes[1] - which is not 
actually the case, by design.

- it adds the overhead of a method and a function call for what is 
mostly a simple "constant" attribute lookup.

FWIW, while it would already work for class-level pseudo-constants 
(using a very simple custom descriptor), I'd qualify such usage as a WTF.



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 04:07:00 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 10:07:00 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.702.1235532187.11746.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>
	<mailman.702.1235532187.11746.python-list@python.org>
Message-ID: <49a50a28$0$25565$426a34cc@news.free.fr>

Ethan Furman a ?crit :
> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
(snip)
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>
>> I don't understand why this would print 3.14159 ... instead of <function
>> __math__.pi>, or whatever.
>>
>> property would clearly have to do something very different in module
>> scope in order to make this work.
>>
> 
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
> 
> Looks like that's how property works, so the same behavior on a module 
> level would do as Brian suggests.

s/module/instance/

At runtime, modules are instances of the module type - so 'module-level' 
names are really instance attributes of the module instance -, and the 
descriptor protocol is only invoked for class attributes.


From jarausch at igpm.rwth-aachen.de  Wed Feb 25 04:16:38 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 10:16:38 +0100
Subject: variable length tuple assignment
Message-ID: <70kgjnFbqktdU1@mid.dfncis.de>

Sorry if this is too simple but I couldn't find.

I vaguely remember there is a means to assign a variable length tuple
and catch the 'rest'  like

S="a,b,c,d"

(A,B,<list of remaining items>) = S.split(',')

I know I could do
SL= split(',')
(A,B)=SL[:2]
Rest= SL[2:]

but is there some shorthand for this?

Many thanks for a hint,

Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From mathieu.malaterre at gmail.com  Wed Feb 25 04:26:58 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Wed, 25 Feb 2009 01:26:58 -0800 (PST)
Subject: =?windows-1252?Q?Re=3A_=27u=27__Obselete_type_=96_it_is_identical_to_=27d=27=2E__?=
	=?windows-1252?Q?=287=29?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<01b464c4$0$18215$c3e8da3@news.astraweb.com>
Message-ID: <adf71b9f-38ae-4e86-9978-41c61709f348@t7g2000yqa.googlegroups.com>

On Feb 24, 11:06 pm, Steven D'Aprano <st... at pearwood.info> wrote:
> mathieu wrote:
> > I did not know where to report that:
>
> > 'u'   Obselete type ? it is identical to 'd'.         (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> > Thanks
>
> If you google on "python bug tracker" the first link is the correct one.
>
> I don't know what you want to report, but I've reported that obsolete is
> mispelled:
>
> http://bugs.python.org/issue5361

Thanks. Now I know :)


From mathieu.malaterre at gmail.com  Wed Feb 25 04:27:39 2009
From: mathieu.malaterre at gmail.com (mathieu)
Date: Wed, 25 Feb 2009 01:27:39 -0800 (PST)
Subject: =?windows-1252?B?UmU6ICd1JyBPYnNlbGV0ZSB0eXBlIJYgaXQgaXMgaWRlbnRpY2FsIHRvICdkJy4gKDc=?=
	=?windows-1252?B?KQ==?=
References: <de675dfe-9fda-4795-a650-99949e2776a9@f24g2000vbf.googlegroups.com>
	<31fa575a-cc0d-4830-ae23-0a784fa3361f@13g2000yql.googlegroups.com>
Message-ID: <93018776-530b-43b3-b728-e593d8ccbb97@x38g2000yqj.googlegroups.com>

On Feb 24, 9:24 pm, John Machin <sjmac... at lexicon.net> wrote:
> On Feb 25, 4:48 am, mathieu <mathieu.malate... at gmail.com> wrote:
>
> > I did not know where to report that:
>
> > 'u'     Obselete type ? it is identical to 'd'.       (7)
>
> >http://docs.python.org/library/stdtypes.html#string-formatting
>
> So what's your problem with that? Do you believe that 'u' is not
> accepted? That 'u' is not identical to 'd' and thus the doc should be
> rewritten as "its behaviour is identical to that of 'd'"? That the
> behaviour of 'u' is NOT identical to that of 'd'? That 'u' should not
> be documented? That 'u' should not be described as obselete?
                                                     ^^^^^^^^

lol :)


From clp2 at rebertia.com  Wed Feb 25 04:41:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 25 Feb 2009 01:41:54 -0800
Subject: variable length tuple assignment
In-Reply-To: <70kgjnFbqktdU1@mid.dfncis.de>
References: <70kgjnFbqktdU1@mid.dfncis.de>
Message-ID: <50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>

On Wed, Feb 25, 2009 at 1:16 AM, Helmut Jarausch
<jarausch at igpm.rwth-aachen.de> wrote:
> Sorry if this is too simple but I couldn't find.
>
> I vaguely remember there is a means to assign a variable length tuple
> and catch the 'rest' ?like
>
> S="a,b,c,d"
>
> (A,B,<list of remaining items>) = S.split(',')

In Python 3.0 (IIRC):

A, B, *rest = S.split(',')

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From robin at reportlab.com  Wed Feb 25 05:07:24 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 25 Feb 2009 10:07:24 +0000
Subject: pep 8 constants
In-Reply-To: <49a50a28$0$25565$426a34cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>
	<49a50a28$0$25565$426a34cc@news.free.fr>
Message-ID: <49A5185C.9080906@chamonix.reportlab.co.uk>

well this sort of awful hackery will allow you to put read only constants on an 
existing module

 >>> import reportlab
 >>> reportlab.__class__
 >>> class MyModule(reportlab.__class__):
... 	@property
... 	def pi(self):
... 		return 3
...
 >>> z=MyModule('reportlab')
 >>> z.__dict__.update(reportlab.__dict__)
 >>> z.pi
3
 >>> import sys
 >>> sys.modules['reportlab']=z
 >>> del reportlab
 >>> import reportlab
 >>> reportlab.pi
3
 >>> reportlab.pi=4
Traceback (most recent call last):
   File "<interactive input>", line 1, in <module>
AttributeError: can't set attribute
 >>>

so I guess if you write your own module class and then use a special importer 
you can create module like objects with read only attributes.


-- 
Robin Becker



From rogerb at rogerbinns.com  Wed Feb 25 05:09:10 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Wed, 25 Feb 2009 02:09:10 -0800
Subject: Is there a way to increase memory allocated to the python
	interpreter
In-Reply-To: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>
References: <225bedee0902242154y245fda96o48f6b53ea2019fc@mail.gmail.com>
Message-ID: <go35c7$3ji$1@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

janandith jayawardena wrote:
> Is there a way to configure the amount of memory allocated to the python
> interpreter.  Can it be increased or decreased using an argument like in
> the Java Virtual Machine.

Java needs the memory allocation number because of the way garbage
collection is done (or at least used to be done).  The CPython
interpreter doesn't have an explicit limit and will use all the address
space the operating system will let it have as needed.  (That typically
works out as around 2GB for a 32 bit process and exhausting swap space
on a 64 bit process).

If you want to prevent using more than a certain amount, then use
functionality provided by your operating system.  On Unix/Linux systems
the ulimit command will do the trick.

Roger
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Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkmlGMMACgkQmOOfHg372QQeMACfVhyccV91nU0WZswc2CNg8KMv
SlEAoMINnO48FoDp0vgxROOWAjYp2tPG
=Vjcf
-----END PGP SIGNATURE-----



From rogerb at rogerbinns.com  Wed Feb 25 05:11:38 2009
From: rogerb at rogerbinns.com (Roger Binns)
Date: Wed, 25 Feb 2009 02:11:38 -0800
Subject: Unix Change Passwd Python CGI
In-Reply-To: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
References: <9999810b0902240719y750fba0dp43a87a9d840ff949@mail.gmail.com>
Message-ID: <go35gq$3ji$2@ger.gmane.org>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Derek Tracy wrote:
> Apache is running on the same system that needs the password changed.  I
> need to keep security high and can not install additional modules at
> this time.
> 
> I just need a general direction to start looking, and I do not have
> expect installed on the system.

I recommend looking in the Samba source code where they have a program
that does just that.

Roger
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkmlGVcACgkQmOOfHg372QTZHACdFG0+Ls2Su/jRqkc4YZyxXK35
N7AAoNKfd7bMypR7b6Ex6auaU/9D4rKa
=POal
-----END PGP SIGNATURE-----



From wongo888 at gmail.com  Wed Feb 25 05:17:33 2009
From: wongo888 at gmail.com (wongobongo)
Date: Wed, 25 Feb 2009 02:17:33 -0800 (PST)
Subject: Python Image Library IOError - cannot find JPEG decoder?
References: <mailman.674.1235496906.11746.python-list@python.org>
Message-ID: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>

On Feb 24, 9:34?am, Dario Traverso <traver... at gmail.com> wrote:
> I've been trying to install the Python Image Library ?(PIL) on my Mac ?
> OSX Leopard laptop, but have been running into some difficulties.
>
> I've built the library, using the included setup.py ?script. The build ?
> summary checks out ok, and sounds the option libraries to all be ?
> found. I grabbed both libjpeg and freetype2 ?using ?fink.
>
> --------------------------------------------------------------------
> PIL 1.1.6 BUILD SUMMARY
> --------------------------------------------------------------------
> version ? ? ? 1.1.6
> platform ? ? ?darwin 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
> ? ? ? ? ? ? ? [GCC 4.0.1 (Apple Inc. build 5465)]
> --------------------------------------------------------------------
> --- TKINTER support ok
> --- JPEG support ok
> --- ZLIB (PNG/ZIP) support ok
> --- FREETYPE2 support ok
> --------------------------------------------------------------------
>
> However, ?I then run the included self test, and 1 out of 57 tests ?
> fails. I receive an IOError. Specifically:
>
> *****************************************************************
> Failure in example: _info(Image.open("Images/lena.jpg"))
> from line #24 of selftest.testimage
> Exception raised:
> Traceback (most recent call last):
> ? File "./doctest.py", line 499, in _run_examples_inner
> ? ? exec compile(source, "<string>", "single") in globs
> ? File "<string>", line 1, in <module>
> ? File "./selftest.py", line 22, in _info
> ? ? im.load()
> ? File "PIL/ImageFile.py", line 180, in load
> ? ? d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
> ? File "PIL/Image.py", line 375, in _getdecoder
> ? ? raise IOError("decoder %s not available" % decoder_name)
> IOError: decoder jpeg not available
> 1 items had failures:
> ? ?1 of ?57 in selftest.testimage
> ***Test Failed*** 1 failures.
> *** 1 tests of 57 failed.
>
> I've followed all of the installation instructions exactly. The build ?
> summary reported everything was "ok". What could be the problem here. ?
> Libjpeg-6b ?is not accessible?
>
> Thank you for any insight you can provide!!
>
> -Dario


That would be my guess.

Two things you may want to try:

1. Check that your Fink libraries and headers were used to make your
PIL (check -I and -L settings on gcc after doing "python setup.py
build_ext -i"). They should point to your Fink lib and include dirs.
2. Line 372 in PIL/Image.py has a debug print line. Try uncommenting
that and see what comes out.

That might give you some clues as to what is going on. You can always
just call up Python in a terminal and try it out (from selftest.py
doctests beginning on line 29).

>>> import Image
>>> def _info(im):
...    im.load()
...    return im.format, im.mode, im.size
>>> im = Image.new("1", (128, 128))
>>> _info(im)
(None, '1', (128, 128))



From bruno.42.desthuilliers at websiteburo.invalid  Wed Feb 25 05:31:23 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 11:31:23 +0100
Subject: pep 8 constants
In-Reply-To: <mailman.722.1235556464.11746.python-list@python.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>	<49a50a28$0$25565$426a34cc@news.free.fr>
	<mailman.722.1235556464.11746.python-list@python.org>
Message-ID: <49a51def$0$20681$426a74cc@news.free.fr>

Robin Becker a ?crit :
> well this sort of awful hackery will allow you to put read only 
> constants on an existing module
> 
(snip example code)
> 
> so I guess if you write your own module class and then use a special 
> importer you can create module like objects with read only attributes.
> 

Fine technical solution. But, err, isn't all this a bit overkill for 
something that can easily be handled by a simple convention ?-)



From gonsolo at gmail.com  Wed Feb 25 05:36:05 2009
From: gonsolo at gmail.com (Gonsolo)
Date: Wed, 25 Feb 2009 02:36:05 -0800 (PST)
Subject: H-Index with Google Scholar
Message-ID: <d20dd2ba-6ba8-457e-9eb7-0312f9d955c2@v19g2000yqn.googlegroups.com>

I wrote a small script to compute the H-Index of an author.
It is modeled after activestate's google search:
http://code.activestate.com/recipes/523047/

Example use:
hindex i daubechies
Result:
49

The script:

#!/usr/bin/python

import httplib, urllib, re, sys
from BeautifulSoup import BeautifulSoup

terms = sys.argv[1:]
limit = 100
params = urllib.urlencode( { 'q': "+".join( terms ), 'num': limit } )
headers = {'User-Agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows
NT)'}
url = '/scholar'+"?"+params
conn = httplib.HTTPConnection( 'scholar.google.com' )
conn.request( "GET", url, {}, headers )

resp = conn.getresponse()
cites = []
if resp.status == 200:
	html = resp.read()
	html = html.decode( 'ascii', 'ignore' )
	soup = BeautifulSoup( html )
	for record in soup( 'p', { 'class': 'g' } ):
		match = re.search("Cited by ([^<]*)", str(record))
		if match != None:
			cite = int( match.group( 1 ) )
			cites.append( cite )
else:
	print 'Error: '
	print resp.status, resp.reason

cites.sort()
cites.reverse()

h = 0
for cite in cites:
	if cite > h:
		h += 1
print h


From robin at reportlab.com  Wed Feb 25 05:56:04 2009
From: robin at reportlab.com (Robin Becker)
Date: Wed, 25 Feb 2009 10:56:04 +0000
Subject: pep 8 constants
In-Reply-To: <49a51def$0$20681$426a74cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<mailman.702.1235532187.11746.python-list@python.org>	<49a50a28$0$25565$426a34cc@news.free.fr>	<mailman.722.1235556464.11746.python-list@python.org>
	<49a51def$0$20681$426a74cc@news.free.fr>
Message-ID: <49A523C4.7030104@chamonix.reportlab.co.uk>

Bruno Desthuilliers wrote:
> Robin Becker a ?crit :
>> well this sort of awful hackery will allow you to put read only 
>> constants on an existing module
>>
> (snip example code)
>>
>> so I guess if you write your own module class and then use a special 
>> importer you can create module like objects with read only attributes.
>>
> 
> Fine technical solution. But, err, isn't all this a bit overkill for 
> something that can easily be handled by a simple convention ?-)
......
no dispute about that :)
-- 
Robin Becker



From nick_keighley_nospam at hotmail.com  Wed Feb 25 06:24:07 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Wed, 25 Feb 2009 03:24:07 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<ea052d08-0621-4281-ad47-f6705f7e289d@f24g2000vbf.googlegroups.com>
Message-ID: <a890a04f-f837-4e1d-a372-0758acb02d8f@c11g2000yqj.googlegroups.com>

On 24 Feb, 15:00, nick_keighley_nos... at hotmail.com wrote:
> On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:

> > Here's a interesting toy problem posted by Drew Krause to
> > comp.lang.lisp:
>
> > ------------------------
> > On Jan 16, 2:29 pm, Drew Krause wrote [paraphrased a bit]:
>
> > OK, I want to create a nested list in Lisp (always of only integers)
> > from a text file, such that each line in the text file would be
> > represented as a sublist in the 'imported' list.
>
> > example of a file's content
>
> > 3 10 2
> > 4 1
> > 11 18
>
> > example of programing behavior
> > (make-list-from-text "blob.txt") => ((3 10 2) (4 1) (11 18))

<snip>

> scheme:
>
> (define (read-line port)
> ? ? (define (rec-read-line port line)
> ? ? ? ? (define next-char (peek-char port))
> ? ? ? ? (define number #f)
> ? ? ? ? (cond ((eof-object? next-char) '())
> ? ? ? ? ? ? ? ((char=? next-char #\newline) (read-char port) line)
> ? ? ? ? ? ? ? ((char-numeric? next-char)
> ? ? ? ? ? ? ? ? ? ?(set! number (read port))
> ? ? ? ? ? ? ? ? ? ?(cons number (rec-read-line port line)))
> ? ? ? ? ? ? ? ((char=? next-char #\space)
> ? ? ? ? ? ? ? ? ? ?(read-char port)
> ? ? ? ? ? ? ? ? ? ?(rec-read-line port line))
> ? ? ? ? ? ? ? (else (error (string-append "bad character \""
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (string next-char) "\"")))
> ? ? ))
>
> ? ? (rec-read-line port '())
> )
>
> (define (make-int-list port)
> ? ? (define line (read-line port))
> ? ? (if (null? line)
> ? ? ? ? '()
> ? ? ? ? (cons line (make-int-list port))))
>
> (define (make-list-from-text file)
> ? ? (make-int-list (open-input-file file)))

an assignment-free version

(define (read-line port)
    (define (rec-read-line port line)
        (let ((next-char (peek-char port)))
            (cond ((eof-object? next-char) '())
                  ((char=? next-char #\newline) (read-char port) line)
                  ((char-numeric? next-char)
                       (let ((number (read port)))
                           (cons number (rec-read-line port line))))
                  ((char=? next-char #\space)
                       (read-char port)
                       (rec-read-line port line))
                  (else (error (string-append "bad character \""
                                   (string next-char) "\""))))))

    (rec-read-line port '()))

(define (make-int-list port)
    (let ((line (read-line port)))
        (if (null? line)
            '()
            (cons line (make-int-list port)))))

(define (make-list-from-text file)
    (make-int-list (open-input-file file)))

(define (mk) (make-list-from-text "blob.txt"))

<snip>

number was originally define'd but I discovered there were
limits to where you could define things


From nick_keighley_nospam at hotmail.com  Wed Feb 25 06:34:33 2009
From: nick_keighley_nospam at hotmail.com (nick_keighley_nospam at hotmail.com)
Date: Wed, 25 Feb 2009 03:34:33 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
Message-ID: <c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com>

On 17 Jan, 17:16, Xah Lee <xah... at gmail.com> wrote:
> comp.lang.lisp,comp.lang.scheme,comp.lang.functional,comp.lang.python,comp.?lang.ruby

<snip>

> The lisp's cons fundamentally makes nested list a pain to work with.
> Lisp's nested syntax makes functional sequencing cumbersome.

so hide it

(define (make-list stream eos?)
    (let ((atom (stream)))
        (if (eos? atom)
            '()
            (cons atom (make-list stream eos?)))))

(define (make-int-list port)
    (make-list (lambda () (read-line port)) null?))

the nasty cons then only appears in a single function which
you can hide in a library


> In the ruby code, its post-fix sequential notation (as a side effect
> of its OOP notation) brings out the beauty of functional sequencing
> paradigm (sometimes known as functional chain, sequencing, filtering,
> unix piping).
>
> its list, like all modern high level langs such as perl, php, python,
> javascript, don't have the lisp's cons problem. The cons destroys the
> usability of lists up-front, untill you have some at least 2 full-time
> years of coding lisp to utilize cons properly. (and even after that,
> it is still a pain to work with, and all you gain is a bit of speed
> optimization in rare cases that requires largish data, most of which
> has better solutions such as a database.)

is my code to build a list that bad?


> Both of these problems i've published articles on.
>
> For more detail on the cons problem, see
> the section ?The Cons Business? at
>
> ? Fundamental Problems of Lisp
> ?http://xahlee.org/UnixResource_dir/writ/lisp_problems.html

I read it. Your point seems to be "cons becomes difficult
with deeply nested structures". Could you give an example?


From python.list at tim.thechases.com  Wed Feb 25 06:35:06 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 25 Feb 2009 05:35:06 -0600
Subject: variable length tuple assignment
In-Reply-To: <50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
References: <70kgjnFbqktdU1@mid.dfncis.de>
	<50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
Message-ID: <49A52CEA.2000603@tim.thechases.com>

Chris Rebert wrote:
> On Wed, Feb 25, 2009 at 1:16 AM, Helmut Jarausch
> <jarausch at igpm.rwth-aachen.de> wrote:
>> Sorry if this is too simple but I couldn't find.
>>
>> I vaguely remember there is a means to assign a variable length tuple
>> and catch the 'rest'  like
>>
>> S="a,b,c,d"
>>
>> (A,B,<list of remaining items>) = S.split(',')
> 
> In Python 3.0 (IIRC):
> 
> A, B, *rest = S.split(',')

As an aside, as of the last time I read the PEP[1] on this, I 
believe it exhausts (or attempts to exhaust) any iterator.  IMHO, 
I think this exhausting is a bad idea because it prevents things like

   def numbers(start=0):
     i = start
     while True:
       yield i
       i += 1

   CONST_A, CONST_B, CONST_C, *rest = numbers()

which will hang in current Py3.0 until you blow a stack or 
overrun your heap somewhere because it will try to exhaust the 
infinite loop.  It also changes the type from iter() to list() 
for the remaining content (not as grevious).


I agree that the "internal star" usage needs to exhaust the iterator:

   A, *rest, C, D = s.split(',')

but the terminal-star syntax should be a little more gracious 
with iterators.

Anyways, my $0.02 (minus taxes, money for multiple bailouts, and 
deflated by economic conditions -- so not worth much :).

-tkc

[1]
http://www.python.org/dev/peps/pep-3132/








From jarausch at igpm.rwth-aachen.de  Wed Feb 25 07:21:03 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 13:21:03 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
Message-ID: <70krdfFc7rn0U1@mid.dfncis.de>

Hi,

I've just tried to write a simple example using PyCrypto's
AES (CBC mode)

#!/usr/bin/python
from Crypto.Cipher import AES

PWD='abcdefghijklmnop'
Initial16bytes='0123456789ABCDEF'

crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
# crypt = AES.new(PWD, AES.MODE_ECB)

txt = 'ea523a664dabaa4476d31226a1e3bab0'

c = crypt.encrypt(txt)

txt_plain=crypt.decrypt(c)

print txt_plain

Unfortunately, txt_plain differs from txt - why?
(Using MODE_ECB does work however)

What am I missing?

Many thanks for a hint,

Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From jarausch at igpm.rwth-aachen.de  Wed Feb 25 07:25:13 2009
From: jarausch at igpm.rwth-aachen.de (Helmut Jarausch)
Date: Wed, 25 Feb 2009 13:25:13 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
In-Reply-To: <70krdfFc7rn0U1@mid.dfncis.de>
References: <70krdfFc7rn0U1@mid.dfncis.de>
Message-ID: <70krl9Fbuqj5U1@mid.dfncis.de>

Helmut Jarausch wrote:
> Hi,
> 
> I've just tried to write a simple example using PyCrypto's
> AES (CBC mode)
> 
> #!/usr/bin/python
> from Crypto.Cipher import AES
> 
> PWD='abcdefghijklmnop'
> Initial16bytes='0123456789ABCDEF'
> 
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
> # crypt = AES.new(PWD, AES.MODE_ECB)
> 
> txt = 'ea523a664dabaa4476d31226a1e3bab0'
> 
> c = crypt.encrypt(txt)
> 
> txt_plain=crypt.decrypt(c)
> 
> print txt_plain
> 
> Unfortunately, txt_plain differs from txt - why?
> (Using MODE_ECB does work however)
> 

I just discovered that the following variant seems to work
crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
c = crypt.encrypt(txt)
crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes) # <<< re-initialize
txt_plain=crypt.decrypt(c)

So, the crypt object seems to keep some state.
I haven't seen this mentioned in the documentation.

Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany


From adisaurabh at gmail.com  Wed Feb 25 07:26:29 2009
From: adisaurabh at gmail.com (aditya saurabh)
Date: Wed, 25 Feb 2009 17:56:29 +0530
Subject: Lambda function
Message-ID: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>

I defined two functions - lets say
fa = lambda x: 2*x
fb = lambda x: 3*x
Now I would like to use fa*fb in terms of x
is there a way?
Thanks in advance
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From king.seth at gmail.com  Wed Feb 25 07:37:19 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 04:37:19 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
Message-ID: <f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>

On Feb 24, 10:55?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Feb 24, 2009 at 7:46 PM, Seth <king.s... at gmail.com> wrote:
> > I am just messing around trying to get pyserial to work with 3.0.
>
> > I am stuck on this line:
>
> > if type(port) in [type(''), type(u'')]
>
> > how can I convert this to 3.0? I tried changing the u to a d that did
> > not do anything.
>
> Looks like it's doing the equivalent of the pre-3.0-ism
> `isinstance(port, basestring)`, but in a roundabout way.
> However, since basestring doesn't exist in 3.0, either:
>
> if isinstance(port, str):
>
> Or
>
> if isinstance(port, bytes):
>
> would be the appropriate replacement. Depends (obviously) on whether
> 'port' is supposed to be unicode or a byte sequence.
> Without more context, I can't really say which is what you want.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

I implemented "if isinstance(port, str): " that seems to work for now.

Currently I am running into:

err, n = win32file.WriteFile(self.hComPort, data,
self._overlappedWrite)
TypeError: expected an object with a buffer interface

Thanks


From jcd at sdf.lonestar.org  Wed Feb 25 07:37:22 2009
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Wed, 25 Feb 2009 07:37:22 -0500
Subject: XML Parsing
In-Reply-To: <581368.29674.qm@web27405.mail.ukl.yahoo.com>
References: <581368.29674.qm@web27405.mail.ukl.yahoo.com>
Message-ID: <1235565442.6046.2.camel@mctell>

Probably because you responded an hour after the question was posted,
and in the dead of night.  Newsgroups often move slower than that.  But
now we have posted a solution like that, so all's well in the world.  :)

Cheers,
Cliff


On Wed, 2009-02-25 at 08:20 +0000, hrishy wrote:
> Hi Lie
> 
> I am not a python guy but very interested in the langauge and i consider the people on this list to be intelligent and was wundering why you people did not suggest xpath for this kind of a problem just curious and willing to learn.
> 
> I am searching for a answer but the question is 
> why not use xpath to extract xml text from a xml doc ?
> 
> regards
> Hrishy
> 
> 
> --- On Wed, 25/2/09, Lie Ryan <lie.1296 at gmail.com> wrote:
> 
> > From: Lie Ryan <lie.1296 at gmail.com>
> > Subject: Re: XML Parsing
> > To: python-list at python.org
> > Date: Wednesday, 25 February, 2009, 7:33 AM
> > Are you searching for answer or searching for another people
> > that have 
> > the same answer as you? :)
> > 
> > "Many roads lead to Rome" is a very famous
> > quotation...
> > 
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> 
> 
>       
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From meesters at gmx.de  Wed Feb 25 07:40:23 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 12:40:23 GMT
Subject: glibc detected *** python: corrupted double-linked list
Message-ID: <49a53c36$0$713$9b622d9e@news.freenet.de>

Hoi,

I have a problem using my software on my 64bit laptop, after an update of
my system. The same code still runs on 32bit Intel, but on my laptop I
provoke the crash in the title. The crash is caused - as narrowed down by
me - by returning a static PyObject from a C-extension function.

Well, now I wondering what to do? A web search delivered no relevant bug
reports about glibc on my system (the recent Ubuntu 8.10). Is there a
source for validated glibc for x86_64? Oh, and I'm using Ubuntu's ready-
made Python package, version 2.5.2..

Anyone experiences with such problems? Any ideas? Information missing?

TIA
Christian

PS The extension module itself can be found here: http://
svn.origo.ethz.ch/viewvc/sas-rigid/src/calc.c?revision=209&view=markup
But, as I said, the code is perhaps far from being perfect, but it runs on
32bit computers. The crash occurs at line 164 - "return py_pofr;".



From zelegolas at gmail.com  Wed Feb 25 07:51:21 2009
From: zelegolas at gmail.com (zelegolas)
Date: Wed, 25 Feb 2009 04:51:21 -0800 (PST)
Subject: Python Imaging Library (PIL): create PDF from scratch
References: <b75ff935-9846-4ecf-984a-d0935873263b@v15g2000vbb.googlegroups.com>
	<MPqdnRO40I7QaT_UnZ2dnUVZ_sjinZ2d@pdx.net>
Message-ID: <d8508669-d6e9-4b8c-8f10-c0cab8e3388c@s19g2000vbp.googlegroups.com>

Like David said now i used PIL for individual images and reportlab to
generate a pdf.

Thanks for your advices :)



From alia_khouri at yahoo.com  Wed Feb 25 07:56:03 2009
From: alia_khouri at yahoo.com (Alia Khouri)
Date: Wed, 25 Feb 2009 04:56:03 -0800 (PST)
Subject: sorting tasks by importance and urgency
Message-ID: <48f61eb3-ab38-4a18-947a-02d091d96aeb@j8g2000yql.googlegroups.com>

I recently considered the apparently simple problem is of how to
algorithmically sort a set of business tasks which have an associated
a value and a due_date, such that the most important and urgent are
pushed to the top of the stack.

The two example task types I am posing here are: (1) a bid on a
contract and (2) leaverequest from an employee.

To sort by importance: I just consider the proportional value of each
task in relation to the total value of tasks.

To sort by urgency: I used something along the lines of excel's
percentrank function (http://office.microsoft.com/en-us/excel/
HP052092121033.aspx) to rank the tasks in percentage terms of the set
of days_to delivery.

The code is pretty self-explanatory, and I think the algorithm seems
to work ok so far, but in case I have missed something or there exists
some better way of doing this...

<priority.py>
from datetime import date

weights = {
    'Tender'      : 1.0,
    'LeaveRequest': 0.1
}

rnd = lambda x: round(x,2)

class Task(object):
    """a simple prioritizing Task class"""

    def __init__(self, kind, value, due_date=None):
        self.kind = kind
        self.value = value
        self.due_date = due_date if due_date else date.today()
        self.weight = weights[kind]
        self.urgency = 0.0
        self.importance = 0.0

    def __repr__(self):
        return '<Task: %5s - %4s - %5s - %12s - %3s - %s>' % (
            rnd(self.priority), rnd(self.importance), rnd
(self.urgency),
            self.kind, self.days_to, self.value)

    def __cmp__(self, other):
        return cmp(self.priority, other.priority)

    @property
    def days_to(self):
        return (self.due_date - date.today()).days

    @property
    def priority(self):
        return self.weight * (self.importance + self.urgency)

    def relative_urgency(self, N, due_days):
        rank = due_days.index(self.days_to)
        return float(rank) / (N - 1)

    def relative_importance(self, total_value):
        return self.value / total_value

    @staticmethod
    def prioritize(tasks):
        print ("<Task: priority - importance - urgency - "
               "kind - days_to - value>\n")
        N = len(tasks)
        total_value = sum(t.value for t in tasks)
        due_days = sorted([t.days_to for t in tasks], reverse=True)
        for i in tasks:
            i.importance = i.relative_importance(total_value)
            i.urgency = i.relative_urgency(N, due_days)

        for i in sorted(tasks, reverse=True):
            print i

tasks = [
    # name               value       due_date
    Task("Tender",       1000000.0,  date(2009,4,1)),
    Task("Tender",       500400.0,   date(2009,5,1)),
    Task("Tender",       1000000.0,  date(2009,6,1)),
    Task("LeaveRequest", 0.0,        date(2009,7,1)),
    Task("LeaveRequest", 0.0,        date(2009,8,1)),
]


if __name__ == '__main__':
    Task.prioritize(tasks)

</priority.py>

regards,

AK


From steve at holdenweb.com  Wed Feb 25 07:58:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 07:58:09 -0500
Subject: Free Python Training
Message-ID: <go3f98$3vn$1@ger.gmane.org>

Not a joke, but a genuine offer extended to anyone who has already
contributed to some open source project. See my blog for full details,
and please pass this on to non-Python programmers who are interested in
learning the language.

  http://holdenweb.blogspot.com/2009/02/free-python-training.html

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From cournape at gmail.com  Wed Feb 25 08:06:37 2009
From: cournape at gmail.com (David Cournapeau)
Date: Wed, 25 Feb 2009 22:06:37 +0900
Subject: glibc detected *** python: corrupted double-linked list
In-Reply-To: <49a53c36$0$713$9b622d9e@news.freenet.de>
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
Message-ID: <5b8d13220902250506u59452297ra9e4de0c9d907bb3@mail.gmail.com>

On Wed, Feb 25, 2009 at 9:40 PM, Christian Meesters <meesters at gmx.de> wrote:
> Hoi,
>
> I have a problem using my software on my 64bit laptop, after an update of
> my system. The same code still runs on 32bit Intel, but on my laptop I
> provoke the crash in the title. The crash is caused - as narrowed down by
> me - by returning a static PyObject from a C-extension function.

Those errors are caused by writing in an invalid pointer, but not far
enough to cause a direct segfault - just enough to corrupt core data
structures of the runtime :)

>
> Well, now I wondering what to do? A web search delivered no relevant bug
> reports about glibc on my system (the recent Ubuntu 8.10). Is there a
> source for validated glibc for x86_64? Oh, and I'm using Ubuntu's ready-
> made Python package, version 2.5.2..

It is very unlikely the problem is in glibc - I would check your code
carefully first :) On Linux, the following are useful:
 - first, try to compile with as many warning flags as possible (-W
-Wall -Wextra is a pretty good baseline)
 - then, if you have a small reproducible crash, run the extension
under valgrind after having built the extension with -g. This will
give you more informations.
 - if the above does not help, using gdb can help too.

If the program works in 32 but not in 64, there are several things to
look at (long is 8 bytes, not 4 on Linux, so some long -> int
convertion may be broken). Sometimes, the program just happens to work
on 32 bits, but by accident (running valgrind on both 32 and 64 bits
may be helpful too).

cheers,

David


From rdmurray at bitdance.com  Wed Feb 25 08:39:58 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 13:39:58 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
Message-ID: <go3hnd$dj0$1@ger.gmane.org>

John Machin <sjmachin at lexicon.net> wrote:
> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
> wrote:
> > Dear python-list,
> >
> > I'm having some trouble decoding an email header using the standard
> > imaplib.IMAP4 class and email.message_from_string method.
> >
> > In particular, email.message_from_string() does not seem to properly
> > decode unicode characters in the subject.
> >
> > How do I decode unicode characters in the subject?
> 
> You don't. You can't. You decode str objects into unicode objects. You
> encode unicode objects into str objects. If your input is not a str
> object, you have a problem.

I can't speak for the OP, but I had a similar (and possibly
identical-in-intent) question.  Suppose you have a Subject line that
looks like this:

    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

How do you get the email module to decode that into unicode?  The same
question applies to the other header lines, and the answer is it isn't
easy, and I had to read and reread the docs and experiment for a while
to figure it out.  I understand there's going to be a sprint on the
email module at pycon, maybe some of this will get improved then.

Here's the final version of my test program.  The third to last line is
one I thought ought to work given that Header has a __unicode__ method.
The final line is the one that did work (note the kludge to turn None
into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
and this code shows why!)

-------------------------------------------------------------------
from email import message_from_string
from email.header import Header, decode_header

x = message_from_string("""\
To: test
Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

this is a test.
""")

print x
print "--------------------"
for key, header in x.items():
    print key, 'type', type(header)
    print key+":", unicode(Header(header)).decode('utf-8')
    print key+":", decode_header(header)
    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
-------------------------------------------------------------------


    From nobody Wed Feb 25 08:35:29 2009
    To: test
    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=

    this is a test.

    --------------------
    To type <type 'str'>
    To: test
    To: [('test', None)]
    To: test
    Subject type <type 'str'>
    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
    Subject: 'u' Obselete type-- it is identical to 'd'. (7)


--RDM



From lists at cheimes.de  Wed Feb 25 08:47:03 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 14:47:03 +0100
Subject: Convert PySerial to python 3.0
In-Reply-To: <f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
Message-ID: <go3i4n$f72$1@ger.gmane.org>

Seth wrote:
> I implemented "if isinstance(port, str): " that seems to work for now.
> 
> Currently I am running into:
> 
> err, n = win32file.WriteFile(self.hComPort, data,
> self._overlappedWrite)
> TypeError: expected an object with a buffer interface

Unicode objects (in Py3k: str) don't implement the buffer interface. You
have to apply a bytes or bytearray instance.

Christian



From ra.ravi.rav at gmail.com  Wed Feb 25 08:58:13 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Wed, 25 Feb 2009 05:58:13 -0800 (PST)
Subject: Forwarding keyword arguments from one function to another
References: <bca3e1f0-984b-44b9-aefd-eaa62577f8f1@v31g2000vbb.googlegroups.com>
	<mailman.476.1235338206.11746.python-list@python.org>
Message-ID: <c0e8b232-e6aa-4386-a4be-d8a982d473f1@f24g2000vbf.googlegroups.com>

Thnak you all.

> In the future, explain "didn't work".
> Wrong output? give actual (copy and paste) and expected.
> Error message? give traceback (copy and paste).

I will be careful.


From ptmcg at austin.rr.com  Wed Feb 25 09:04:23 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 25 Feb 2009 06:04:23 -0800 (PST)
Subject: XML Parsing
References: <mailman.715.1235546254.11746.python-list@python.org>
Message-ID: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>

On Feb 25, 1:17?am, hrishy <hris... at yahoo.co.uk> wrote:
> Hi
>
> Something like this
>
<snip solution using ElementTree>
>
> Note i am not a python programmer just a enthusiast and i was curious why people on the list didnt suggest a code like above
>

You just beat the rest of us to it - good example of ElementTree for
parsing XML (and I Iearned the '//' shortcut for one or more
intervening tag levels).

To the OP: if you are parsing XML, I would look hard at the modules
(esp. ElementTree) that are written explicitly for XML, before
considering using regular expressions.  There are just too many
potential surprises when trying to match XML tags - presence/absence/
order of attributes, namespaces, whitespace inside tags, to name a
few.

-- Paul


From starsareblueandfaraway at gmail.com  Wed Feb 25 09:09:49 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Wed, 25 Feb 2009 09:09:49 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
In-Reply-To: <go3hnd$dj0$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
Message-ID: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>

Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
code you suggested, RDM.  It looks quite helpful and I'll report the
results.

In the meantime, John asked for more data.  The sender's email client
is Microsoft Outlook 11.  The recipient email client is Lotus Notes.



Actual Subject
=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=

Expected Subject
Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records

X-Mailer
Microsoft Office Outlook 11

X-MimeOLE
Produced By Microsoft MimeOLE V6.00.2900.5579



RHH



On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
> John Machin <sjmachin at lexicon.net> wrote:
>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>> wrote:
>> > Dear python-list,
>> >
>> > I'm having some trouble decoding an email header using the standard
>> > imaplib.IMAP4 class and email.message_from_string method.
>> >
>> > In particular, email.message_from_string() does not seem to properly
>> > decode unicode characters in the subject.
>> >
>> > How do I decode unicode characters in the subject?
>>
>> You don't. You can't. You decode str objects into unicode objects. You
>> encode unicode objects into str objects. If your input is not a str
>> object, you have a problem.
>
> I can't speak for the OP, but I had a similar (and possibly
> identical-in-intent) question. ?Suppose you have a Subject line that
> looks like this:
>
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> How do you get the email module to decode that into unicode? ?The same
> question applies to the other header lines, and the answer is it isn't
> easy, and I had to read and reread the docs and experiment for a while
> to figure it out. ?I understand there's going to be a sprint on the
> email module at pycon, maybe some of this will get improved then.
>
> Here's the final version of my test program. ?The third to last line is
> one I thought ought to work given that Header has a __unicode__ method.
> The final line is the one that did work (note the kludge to turn None
> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
> and this code shows why!)
>
> -------------------------------------------------------------------
> from email import message_from_string
> from email.header import Header, decode_header
>
> x = message_from_string("""\
> To: test
> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> this is a test.
> """)
>
> print x
> print "--------------------"
> for key, header in x.items():
> ? ?print key, 'type', type(header)
> ? ?print key+":", unicode(Header(header)).decode('utf-8')
> ? ?print key+":", decode_header(header)
> ? ?print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
> -------------------------------------------------------------------
>
>
> ? ?From nobody Wed Feb 25 08:35:29 2009
> ? ?To: test
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
> ? ? ? ? ? ?=?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>
> ? ?this is a test.
>
> ? ?--------------------
> ? ?To type <type 'str'>
> ? ?To: test
> ? ?To: [('test', None)]
> ? ?To: test
> ? ?Subject type <type 'str'>
> ? ?Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?= ? =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
> ? ?Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
> ? ?Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>
>
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Wed Feb 25 09:20:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 09:20:21 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
Message-ID: <49A553A5.4050309@holdenweb.com>

Roy H. Han wrote:
> On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
[Top-posting corrected]
>> John Machin <sjmachin at lexicon.net> wrote:
>>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>>> wrote:
>>>> Dear python-list,
>>>>
>>>> I'm having some trouble decoding an email header using the standard
>>>> imaplib.IMAP4 class and email.message_from_string method.
>>>>
>>>> In particular, email.message_from_string() does not seem to properly
>>>> decode unicode characters in the subject.
>>>>
>>>> How do I decode unicode characters in the subject?
>>> You don't. You can't. You decode str objects into unicode objects. You
>>> encode unicode objects into str objects. If your input is not a str
>>> object, you have a problem.
>> I can't speak for the OP, but I had a similar (and possibly
>> identical-in-intent) question.  Suppose you have a Subject line that
>> looks like this:
>>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> How do you get the email module to decode that into unicode?  The same
>> question applies to the other header lines, and the answer is it isn't
>> easy, and I had to read and reread the docs and experiment for a while
>> to figure it out.  I understand there's going to be a sprint on the
>> email module at pycon, maybe some of this will get improved then.
>>
>> Here's the final version of my test program.  The third to last line is
>> one I thought ought to work given that Header has a __unicode__ method.
>> The final line is the one that did work (note the kludge to turn None
>> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
>> and this code shows why!)
>>
>> -------------------------------------------------------------------
>> from email import message_from_string
>> from email.header import Header, decode_header
>>
>> x = message_from_string("""\
>> To: test
>> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> this is a test.
>> """)
>>
>> print x
>> print "--------------------"
>> for key, header in x.items():
>>    print key, 'type', type(header)
>>    print key+":", unicode(Header(header)).decode('utf-8')
>>    print key+":", decode_header(header)
>>    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
>> -------------------------------------------------------------------
>>
>>
>>    From nobody Wed Feb 25 08:35:29 2009
>>    To: test
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
>>            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>>    this is a test.
>>
>>    --------------------
>>    To type <type 'str'>
>>    To: test
>>    To: [('test', None)]
>>    To: test
>>    Subject type <type 'str'>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
>>    Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>>
>>
> Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
> code you suggested, RDM.  It looks quite helpful and I'll report the
> results.
> 
> In the meantime, John asked for more data.  The sender's email client
> is Microsoft Outlook 11.  The recipient email client is Lotus Notes.
> 
> 
> 
> Actual Subject
> =?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=
> 
> Expected Subject
> Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records
> 
> X-Mailer
> Microsoft Office Outlook 11
> 
> X-MimeOLE
> Produced By Microsoft MimeOLE V6.00.2900.5579
> 
>>> from email.header import decode_header
>>> print
decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
[('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
Records', 'us-ascii')]
>>>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Wed Feb 25 09:20:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 09:20:21 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
Message-ID: <49A553A5.4050309@holdenweb.com>

Roy H. Han wrote:
> On Wed, Feb 25, 2009 at 8:39 AM,  <rdmurray at bitdance.com> wrote:
[Top-posting corrected]
>> John Machin <sjmachin at lexicon.net> wrote:
>>> On Feb 25, 11:07=A0am, "Roy H. Han" <starsareblueandfara... at gmail.com>
>>> wrote:
>>>> Dear python-list,
>>>>
>>>> I'm having some trouble decoding an email header using the standard
>>>> imaplib.IMAP4 class and email.message_from_string method.
>>>>
>>>> In particular, email.message_from_string() does not seem to properly
>>>> decode unicode characters in the subject.
>>>>
>>>> How do I decode unicode characters in the subject?
>>> You don't. You can't. You decode str objects into unicode objects. You
>>> encode unicode objects into str objects. If your input is not a str
>>> object, you have a problem.
>> I can't speak for the OP, but I had a similar (and possibly
>> identical-in-intent) question.  Suppose you have a Subject line that
>> looks like this:
>>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> How do you get the email module to decode that into unicode?  The same
>> question applies to the other header lines, and the answer is it isn't
>> easy, and I had to read and reread the docs and experiment for a while
>> to figure it out.  I understand there's going to be a sprint on the
>> email module at pycon, maybe some of this will get improved then.
>>
>> Here's the final version of my test program.  The third to last line is
>> one I thought ought to work given that Header has a __unicode__ method.
>> The final line is the one that did work (note the kludge to turn None
>> into 'ascii'...IMO 'ascii' is what deocde_header _should_ be returning,
>> and this code shows why!)
>>
>> -------------------------------------------------------------------
>> from email import message_from_string
>> from email.header import Header, decode_header
>>
>> x = message_from_string("""\
>> To: test
>> Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>> this is a test.
>> """)
>>
>> print x
>> print "--------------------"
>> for key, header in x.items():
>>    print key, 'type', type(header)
>>    print key+":", unicode(Header(header)).decode('utf-8')
>>    print key+":", decode_header(header)
>>    print key+":", ''.join([s.decode(t or 'ascii') for (s, t) in decode_header(header)]).encode('utf-8')
>> -------------------------------------------------------------------
>>
>>
>>    From nobody Wed Feb 25 08:35:29 2009
>>    To: test
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=
>>            =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>
>>    this is a test.
>>
>>    --------------------
>>    To type <type 'str'>
>>    To: test
>>    To: [('test', None)]
>>    To: test
>>    Subject type <type 'str'>
>>    Subject: 'u' Obselete type =?ISO-8859-1?Q?--_it_is_identical_?=   =?ISO-8859-1?Q?to_=27d=27=2E_=287=29?=
>>    Subject: [("'u' Obselete type", None), ("-- it is identical to 'd'. (7)", 'iso-8859-1')]
>>    Subject: 'u' Obselete type-- it is identical to 'd'. (7)
>>
>>
> Thanks for writing back, RDM and John Machin.  Tomorrow I'll try the
> code you suggested, RDM.  It looks quite helpful and I'll report the
> results.
> 
> In the meantime, John asked for more data.  The sender's email client
> is Microsoft Outlook 11.  The recipient email client is Lotus Notes.
> 
> 
> 
> Actual Subject
> =?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=
> 
> Expected Subject
> Inteum C/SR User Tip: Quick Access to Recently Opened Inteum C/SR Records
> 
> X-Mailer
> Microsoft Office Outlook 11
> 
> X-MimeOLE
> Produced By Microsoft MimeOLE V6.00.2900.5579
> 
>>> from email.header import decode_header
>>> print
decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
[('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
Records', 'us-ascii')]
>>>

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From aahz at pythoncraft.com  Wed Feb 25 09:21:54 2009
From: aahz at pythoncraft.com (Aahz)
Date: 25 Feb 2009 06:21:54 -0800
Subject: Free Python Training: Washington, DC (3/3-5)
References: <mailman.729.1235566709.11746.python-list@python.org>
Message-ID: <go3k62$lvs$1@panix3.panix.com>

In article <mailman.729.1235566709.11746.python-list at python.org>,
Steve Holden  <steve at holdenweb.com> wrote:
>
>Not a joke, but a genuine offer extended to anyone who has already
>contributed to some open source project. See my blog for full details,
>and please pass this on to non-Python programmers who are interested in
>learning the language.
>
>  http://holdenweb.blogspot.com/2009/02/free-python-training.html

Fixed the Subject: line for you.  ;-)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.


From stefan_ml at behnel.de  Wed Feb 25 09:39:15 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 25 Feb 2009 15:39:15 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <49a1b17d$0$28748$9b622d9e@news.freenet.de>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<49a1b17d$0$28748$9b622d9e@news.freenet.de>
Message-ID: <49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>

Martin v. L?wis wrote:
> intelliminer at gmail.com wrote:
>> Is there a limit to the size or number of entries that a single 
>> dictionary can possess?
> 
> On a 32-bit system, the dictionary can have up to 2**31 slots,
> meaning that the maximum number of keys is slightly smaller
> (about 2**30).

Which, in practice, means that the size is limited by the available memory.

Stefan


From marduk at letterboxes.org  Wed Feb 25 09:42:32 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Wed, 25 Feb 2009 09:42:32 -0500
Subject: Lambda function
In-Reply-To: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
References: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
Message-ID: <1235572952.11727.2.camel@localhost.localdomain>

On Wed, 2009-02-25 at 17:56 +0530, aditya saurabh wrote:
> I defined two functions - lets say
> fa = lambda x: 2*x
> fb = lambda x: 3*x
> Now I would like to use fa*fb in terms of x
> is there a way?
> Thanks in advance

I'm not sure what "use fa*fb in terms of x" means.

But if you mean fa(x) * fb(x) then it's just:

    fa(x) * fb(x)

-a



From bnsilinux at gmail.com  Wed Feb 25 09:43:35 2009
From: bnsilinux at gmail.com (Ben)
Date: Wed, 25 Feb 2009 06:43:35 -0800 (PST)
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
Message-ID: <33411bf0-396a-4aef-83ad-4d4e68b26050@l22g2000vba.googlegroups.com>

On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> Ben <bnsili... at gmail.com> wrote:
> > ?No, It uses the the S-lang for video, and input control. However, SLAG
> > ?is more of an abstract layer on top of that.
>
> > ?It has a Structures that contains menus and screens (menumodule /
> > ?screenmodule). One LOADS them up with parameters. ?such as creating
> > ?a new menu is like:
>
> > ?OpenMenu( Company name, SubSystem, this program name, mode, bottom
> > ?status display) - Create initial menu structure Addtomenu(Menu
> > ?Block Set name, DISPLAY line, ID, type of program, password ID ) -
> > ?add to / update MENU blocks. ?runMenu() - Displays the whole create
> > ?menu structure.
>
> > ?The Menu structure is done in pull downs and scrollable blocks in a
> > ?TUI (text User Interface) and using the S-lang screen library is
> > ?fully mouseable.
>
> > ?The screen module works mych the same way, but with the abiltity to
> > ?open and close and work within "Sub Screens".
>
> > ?For those who do not know, S-lang is a interpreted language much
> > ?like Python. However, there is s direth of library modules. The
> > ?original S-lang started out as library of screen of keyboard
> > ?modules, but has been expanded
>
> > ?My SLAG project does not care in reality WHICH or what language, it
> > ?is simply handling menu and screen control.
>
> So do you want to embed python into your code?
>
> I'm still not clear what you are trying to achieve with python, though
> I have a better idea what SLAG is now!
>
> --
> Nick Craig-Wood <n... at craig-wood.com> --http://www.craig-wood.com/nick

Actually no, I want to EXTEND python using the lower levels of S-lang
screen modules.

My Modules are written in C and are a frame work for building pull-
down menus and data entry screens.

Very nice for writing business applications. Think along the lines of
FoxPro and/or the
"Screen" section in Cobol and you have a pretty good idea of what i
have done.


From rdmurray at bitdance.com  Wed Feb 25 09:50:37 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 14:50:37 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com>
Message-ID: <go3lrt$und$1@ger.gmane.org>

Steve Holden <steve at holdenweb.com> wrote:
> >>> from email.header import decode_header
> >>> print
> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
> Records', 'us-ascii')]
> >>>

It is interesting that decode_header does what I would consider to be
the right thing (from a pragmatic standpoint) with that particular bit
of Microsoft not-quite-standards-compliant brain-damage; but, removing
the tab is not in fact standards compliant if I'm reading the RFC
correctly.

--RDM



From king.seth at gmail.com  Wed Feb 25 10:07:51 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 07:07:51 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
Message-ID: <ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>

I tried all three ways you guys listed nothing seems to convert the
string to bytes.

It may have to do with the makeDeviceName function, but I can't find
where that is defined.

Any thoughts??

Here is the whole block of code:

if type(port) in (str, bytes):       #strings are taken directly
Originally:     if type(port) in [type(''), type(u'')]
                self.portstr = port
            else:
                self.portstr = self.makeDeviceName(port)



On Feb 25, 8:47?am, Christian Heimes <li... at cheimes.de> wrote:
> Seth wrote:
> > I implemented "if isinstance(port, str): " that seems to work for now.
>
> > Currently I am running into:
>
> > err, n = win32file.WriteFile(self.hComPort, data,
> > self._overlappedWrite)
> > TypeError: expected an object with a buffer interface
>
> Unicode objects (in Py3k: str) don't implement the buffer interface. You
> have to apply a bytes or bytearray instance.
>
> Christian



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:10:30 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:10:30 -0200
Subject: Lambda function
References: <9d1b5e270902250426q63913a87q28c06844ef175326@mail.gmail.com>
	<1235572952.11727.2.camel@localhost.localdomain>
Message-ID: <op.upwxrsagx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 12:42:32 -0200, Albert Hopkins  
<marduk at letterboxes.org> escribi?:
> On Wed, 2009-02-25 at 17:56 +0530, aditya saurabh wrote:

>> I defined two functions - lets say
>> fa = lambda x: 2*x
>> fb = lambda x: 3*x
>> Now I would like to use fa*fb in terms of x
>> is there a way?
>> Thanks in advance
>
> I'm not sure what "use fa*fb in terms of x" means.
>
> But if you mean fa(x) * fb(x) then it's just:
>
>     fa(x) * fb(x)

I think he wants function composition, fb(fa(x)):

def compose(*funcs):
   def composed(x, funcs=funcs):
     for f in reversed(funcs):
       x = f(x)
     return x
   return composed

def square(x): return x**2
def plus1(x): return x+1
# same as plus1 = lambda x: x+1 but I like the def syntax

y = compose(square, plus1) # y=(x+1)**2
y(3) # -> 16

(or is it fa(fb(x))?)

-- 
Gabriel Genellina



From lists at cheimes.de  Wed Feb 25 10:16:11 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 16:16:11 +0100
Subject: Convert PySerial to python 3.0
In-Reply-To: <ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>	<mailman.704.1235534148.11746.python-list@python.org>	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
Message-ID: <go3nbr$53q$1@ger.gmane.org>

Seth wrote:
> I tried all three ways you guys listed nothing seems to convert the
> string to bytes.
> 
> It may have to do with the makeDeviceName function, but I can't find
> where that is defined.
> 
> Any thoughts??
> 
> Here is the whole block of code:
> 
> if type(port) in (str, bytes):       #strings are taken directly
> Originally:     if type(port) in [type(''), type(u'')]
>                 self.portstr = port
>             else:
>                 self.portstr = self.makeDeviceName(port)

str and bytes are two totally unrelated things in Python 3.0. You can no
longer treat them equally like str and unicode in Python 2.x. Your could
should not work under Python 3.0 anyway. u'' is invalid in 3.x.

Also please don't use ugly type checks like type(something) == type('').
Starting with Python 2.2 you should use isinstance, for example
isinstance(number, (int, long)).

Christian



From starsareblueandfaraway at gmail.com  Wed Feb 25 10:17:22 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Wed, 25 Feb 2009 10:17:22 -0500
Subject: How do I decode unicode characters in the subject using 
	email.message_from_string()?
In-Reply-To: <go3lrt$und$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
Message-ID: <6a5569ec0902250717q7832bce3ocb6ae279184b32a0@mail.gmail.com>

Cool, it works!

Thanks, RDM, for stating the right approach.
Thanks, Steve, for teaching by example.

I wonder why the email.message_from_string() method doesn't call
email.header.decode_header() automatically.


On Wed, Feb 25, 2009 at 9:50 AM,  <rdmurray at bitdance.com> wrote:
> Steve Holden <steve at holdenweb.com> wrote:
>> >>> from email.header import decode_header
>> >>> print
>> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
>> [('Inteum C/SR User Tip: ?Quick Access to Recently Opened Inteum C/SR
>> Records', 'us-ascii')]
>> >>>
>
> It is interesting that decode_header does what I would consider to be
> the right thing (from a pragmatic standpoint) with that particular bit
> of Microsoft not-quite-standards-compliant brain-damage; but, removing
> the tab is not in fact standards compliant if I'm reading the RFC
> correctly.
>
> --RDM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Wed Feb 25 10:24:17 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 10:24:17 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <go3lrt$und$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>
Message-ID: <go3nra$71j$1@ger.gmane.org>

rdmurray at bitdance.com wrote:
> Steve Holden <steve at holdenweb.com> wrote:
>>>>> from email.header import decode_header
>>>>> print
>> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
>> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
>> Records', 'us-ascii')]
> 
> It is interesting that decode_header does what I would consider to be
> the right thing (from a pragmatic standpoint) with that particular bit
> of Microsoft not-quite-standards-compliant brain-damage; but, removing
> the tab is not in fact standards compliant if I'm reading the RFC
> correctly.
> 
You'd need to quote me chapter and verse on that. I understood that the
tab simply indicated continuation, but it's a *long* time since I read
the RFCs.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From music24by7 at gmail.com  Wed Feb 25 10:26:30 2009
From: music24by7 at gmail.com (Sudhir Kakumanu)
Date: Wed, 25 Feb 2009 20:56:30 +0530
Subject: File Path retrieving problem
Message-ID: <52c4d4ea0902250726u44e4ddap95fa68cd37a8f8f3@mail.gmail.com>

Hi all,

I am new to Python, i have installed python 2.5.4 and it is my requirement.

I need to retrieve the path of filename in python.

I have found some API's to get this:

from os.path import realpath
print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the path of
the file as C:\Python25\WorkSpace\NEWS.txt
print realpath("abc.txt") # here abc.txt does not exist but still it shows
C:\Python25\WorkSpace\abc.txt

can anybody tell the reason why????


Now took some safety measures:

found = lexists(realpath(filename))
        if found == 0:
            print "Not Found"
        else:
            print realpath(filename)

i have given the filename as "NEWS.txt" and "abc.txt" but i am always
getting the output as "Not Found"


Can anyone please tell me where am i doing wrong????

also any suggestions to retrieve the filepath from a given filename is
highly appreciated.

Thanks in advance.


Regards,
Sudhir
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From pythonsky at sky.com  Wed Feb 25 10:31:25 2009
From: pythonsky at sky.com (Gary Wood)
Date: Wed, 25 Feb 2009 15:31:25 -0000
Subject: Newbie : this works in one direction but get the error on the return
	path 
Message-ID: <F1ABEEBBCB124871975C6A14B9572794@Woodygar>

'''Test animation of a group of objects making a face.
Combine the face elements in a function, and use it twice.
Have an extra level of repetition in the animation.
'''

from graphics import *
import time

def moveAll(shapeList, dx, dy):
    ''' Move all shapes in shapeList by (dx, dy).'''    
    for shape in shapeList: 
        shape.move(dx, dy)
            

def moveAllOnLine(shapeList, dx, dy, repetitions, delay):
    '''Animate the shapes in shapeList along a line.
    Move by (dx, dy) each time.
    Repeat the specified number of repetitions.
    Have the specified delay (in seconds) after each repeat.
    '''
    for i in range(repetitions):
        moveAll(shapeList, dx, dy)
        time.sleep(delay)
        

def makeFace(center, win):
    '''display face centered at center in window win.
    Return a list of the shapes in the face.
    '''
    
    head = Circle(center, 25)
    head.setFill("yellow")
    head.draw(win)

    eye1Center = center.clone()  #face positions are relative to the center
    eye1Center.move(-10, 5)      #locate further points in relation to others
    eye1 = Circle(eye1Center, 5)
    eye1.setFill('blue')
    eye1.draw(win)

    eye2End1 = eye1Center.clone()
    eye2End1.move(15, 0)
    eye2End2 = eye2End1.clone()
    eye2End2.move(10, 0)
    
    eye2 = Line(eye2End1, eye2End2)
    eye2.setWidth(3)
    eye2.draw(win)

    noseTop = center.clone()
    noseTop.move(0,0)
    noseLeft = noseTop.clone()
    noseLeft.move(-2,-2)
    noseRight = noseLeft.clone()
    noseRight.move(5,0)
    nose = Polygon(noseTop,noseLeft,noseRight)
    nose.draw(win)


    mouthCorner1 = center.clone()
    mouthCorner1.move(-10, -10)
    mouthCorner2 = mouthCorner1.clone()
    mouthCorner2.move(20, -5)
    
    mouth = Oval(mouthCorner1, mouthCorner2)
    mouth.setFill("red")
    mouth.draw(win)

    return [head, eye1, eye2,nose, mouth]

def main():
    winWidth = 300
    winHeight = 300
    win = GraphWin('Back and Forth', winWidth, winHeight)
    win.setCoords(0, 0, winWidth, winHeight)  #make right side up coordinates!

    rect = Rectangle(Point(200, 90), Point(220, 100))
    rect.setFill("blue")
    rect.draw(win)

    faceList = makeFace(Point(40, 100), win)
    faceList2 = makeFace(Point(150,125), win)

    stepsAcross = 40
    dx = 5
    dy = 3
    wait = .1
    for i in range(2):
        moveAllOnLine(faceList, dx, 0, stepsAcross, wait)
        moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
        moveAllOnLine(faceList, -dx, -dy, stepsAcross//2, wait) 

    Text(Point(winWidth/2, 20), 'Click anywhere to quit.').draw(win)
    win.getMouse()
    win.close()

main()


Traceback (most recent call last):
  File "E:/python/handson/backAndForth4.py", line 97, in <module>
    main()
  File "E:/python/handson/backAndForth4.py", line 90, in main
    moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
  File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
    for i in range(repetitions):
TypeError: 'float' object cannot be interpreted as an integer
>>> 
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From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:33:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:33:13 -0200
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
Message-ID: <op.upwytna6x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 10:40:23 -0200, Christian Meesters <meesters at gmx.de>  
escribi?:

> I have a problem using my software on my 64bit laptop, after an update of
> my system. The same code still runs on 32bit Intel, but on my laptop I
> provoke the crash in the title. The crash is caused - as narrowed down by
> me - by returning a static PyObject from a C-extension function.

I think you got all the reference counts wrong, specially dummy1, dummy2  
and r.

(BTW, when you know the size, it's better to use PyList_New(size) +  
PyList_SET_ITEM instead of PyList_New(0) + PyList_Append)

-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 10:36:59 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 15:36:59 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.730.1235567202.11746.python-list@python.org>
Message-ID: <49a5659b$0$656$9b622d9e@news.freenet.de>

Thanks David!

It's still not debugged, but indeed: I get a bunch of warnings. And this 
already showed me that there are more potential problems than my first 
guess indicated. Alas, for my specific problem I cannot work with ints 
chars and doubles. I need to have unsigned longs at some points.

Well, I'll sort it out.

Cheers
Christian


From music24by7 at gmail.com  Wed Feb 25 10:37:21 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 07:37:21 -0800 (PST)
Subject: File Path retrieving problem
Message-ID: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>

Hi all,

I am new to Python, i have installed python 2.5.4 and it is my
requirement.

I need to retrieve the path of filename in python.

I have found some API's to get this:

from os.path import realpath
print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
path of the file as C:\Python25\WorkSpace\NEWS.txt
print realpath("abc.txt") # here abc.txt does not exist but still it
shows C:\Python25\WorkSpace\abc.txt

can anybody tell the reason why????


Now took some safety measures:

found = lexists(realpath(filename))
        if found == 0:
            print "Not Found"
        else:
            print realpath(filename)

i have given the filename as "NEWS.txt" and "abc.txt" but i am always
getting the output as "Not Found"


Can anyone please tell me where am i doing wrong????

also any suggestions to retrieve the filepath from a given filename is
highly appreciated.

Thanks in advance.


Regards,
Sudhir


From thorsten at thorstenkampe.de  Wed Feb 25 10:40:31 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 16:40:31 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
Message-ID: <MPG.240f84deef77395e9897cc@news.individual.de>

* Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
> Thanks, RDM, for stating the right approach.
> Thanks, Steve, for teaching by example.
> 
> I wonder why the email.message_from_string() method doesn't call
> email.header.decode_header() automatically.

And I wonder why you would think the header contains Unicode characters 
when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency 
to label everything "Unicode" someone does not understand.

Thorsten


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 10:51:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 13:51:18 -0200
Subject: Newbie : this works in one direction but get the error on the
	return path
References: <F1ABEEBBCB124871975C6A14B9572794@Woodygar>
Message-ID: <op.upwznsvux6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:31:25 -0200, Gary Wood <pythonsky at sky.com> escribi?:

Start looking at the error:

> Traceback (most recent call last):
>   File "E:/python/handson/backAndForth4.py", line 97, in <module>
>     main()
>   File "E:/python/handson/backAndForth4.py", line 90, in main
>     moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
>   File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
>     for i in range(repetitions):
> TypeError: 'float' object cannot be interpreted as an integer

It's rather understandable - you have a float object where Python is  
expecting an integer.
Where? The traceback says it all:

>   File "E:/python/handson/backAndForth4.py", line 21, in moveAllOnLine
>     for i in range(repetitions):

Ok, so repetitions should be an integer, but it isn't. Where does it come  
from? It's an argument to moveAllOnLine, and was called from main (see the  
line above that in the traceback). Now we look near that line:

>     for i in range(2):
>         moveAllOnLine(faceList, dx, 0, stepsAcross, wait)
>         moveAllOnLine(faceList, -dx, dy, stepsAcross/2, wait)
>         moveAllOnLine(faceList, -dx, -dy, stepsAcross//2, wait)

Don't you see something suspicious...?


-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 10:51:20 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 15:51:20 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.744.1235576012.11746.python-list@python.org>
Message-ID: <49a568f8$0$656$9b622d9e@news.freenet.de>

Hi,

>> I have a problem using my software on my 64bit laptop, after an update
>> of my system. The same code still runs on 32bit Intel, but on my laptop
>> I provoke the crash in the title. The crash is caused - as narrowed
>> down by me - by returning a static PyObject from a C-extension
>> function.
> 
> I think you got all the reference counts wrong, specially dummy1, dummy2
> and r.
Might be a good point, but can you give me a hint where to look 
specifically?
> 
> (BTW, when you know the size, it's better to use PyList_New(size) +
> PyList_SET_ITEM instead of PyList_New(0) + PyList_Append)
Just rewrote that section.

Thank you.
Christian


From antisuho at gmail.com  Wed Feb 25 10:52:03 2009
From: antisuho at gmail.com (anti-suho)
Date: Wed, 25 Feb 2009 07:52:03 -0800 (PST)
Subject: How to convert image into numpy.ndarray
Message-ID: <4e80357e-039e-4165-bd73-c23603a0299a@r34g2000vbp.googlegroups.com>

In scipy module, there is a function named misc.lena which can return
an array of numpy.ndarray type. If you use this array as parameter of
matplotlib.pyplot.imshow and then call the matplotlib.pyplot.imshow
function, an image will be shown. The shown image is generated by the
numpy.ndarray array.

How to convert an arbitrary image into an array of numpy.ndarray type?


From steve at holdenweb.com  Wed Feb 25 10:57:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 10:57:41 -0500
Subject: File Path retrieving problem
In-Reply-To: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
Message-ID: <go3ppv$erg$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> Hi all,
> 
> I am new to Python, i have installed python 2.5.4 and it is my
> requirement.
> 
> I need to retrieve the path of filename in python.
> 
> I have found some API's to get this:
> 
> from os.path import realpath
> print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
> path of the file as C:\Python25\WorkSpace\NEWS.txt
> print realpath("abc.txt") # here abc.txt does not exist but still it
> shows C:\Python25\WorkSpace\abc.txt
> 
> can anybody tell the reason why????
> 
> 
> Now took some safety measures:
> 
> found = lexists(realpath(filename))
>         if found == 0:
>             print "Not Found"
>         else:
>             print realpath(filename)
> 
> i have given the filename as "NEWS.txt" and "abc.txt" but i am always
> getting the output as "Not Found"
> 
> 
> Can anyone please tell me where am i doing wrong????
> 
It seems pretty apparent that lexists() nevert returns a true result.

Why not just

if os.path.exists(filename):
    print os.path.realpath(filename)
else:
    print "Not found"

> also any suggestions to retrieve the filepath from a given filename is
> highly appreciated.
> 
Well, realpath returns the path of the file targeted after any symbolic
links have been evaluated, which may or may not be what you want. Have
you looked at os.path.abspath?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:00:16 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:00:16 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
Message-ID: <op.upwz2qzjx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:

> * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>> Thanks, RDM, for stating the right approach.
>> Thanks, Steve, for teaching by example.
>>
>> I wonder why the email.message_from_string() method doesn't call
>> email.header.decode_header() automatically.
>
> And I wonder why you would think the header contains Unicode characters
> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> to label everything "Unicode" someone does not understand.

And I wonder why you would think the header does *not* contain Unicode  
characters when it says "us-ascii"?. I think there is a tendency here  
too...

-- 
Gabriel Genellina



From king.seth at gmail.com  Wed Feb 25 11:07:30 2009
From: king.seth at gmail.com (Seth)
Date: Wed, 25 Feb 2009 08:07:30 -0800 (PST)
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
	<mailman.739.1235574990.11746.python-list@python.org>
Message-ID: <67d9d270-afad-4c4a-a585-81544ef66670@x13g2000yqf.googlegroups.com>

This is not my code and I am fairly new to Python.  I did not know how
much it would take to convert pyserial to 3.0. Someone more
knowledgeable than me could do it better and faster.  I just want to
see if I could help get it to work.

I was wrong, it seems that if type(port) in (str, bytes): or isinstance
(port, str) works just fine for setting the ports.

The issue now is reading and writing the data.

I got the read() to kind of work with:
bytes(buf[:n]) replacing str(buf[:n])

but with readline() it seems to be missing the '\n' because it just
runs indefinitely( I can see the \n if I read enough bytes with read()


write seems to be related to a win32 issue.  win32file.WriteFile does
not like anything I convert it to:
str gives the buffer error
bytes gives a "string argument without an encoding" error

Sorry for the confusion, I just want to be able to use all Py3k on
this project that I am working on and pyserial has not been converted
so I just started messing around with it.

Thanks for the help.

Seth




On Feb 25, 10:16?am, Christian Heimes <li... at cheimes.de> wrote:
> Seth wrote:
> > I tried all three ways you guys listed nothing seems to convert the
> > string to bytes.
>
> > It may have to do with the makeDeviceName function, but I can't find
> > where that is defined.
>
> > Any thoughts??
>
> > Here is the whole block of code:
>
> > if type(port) in (str, bytes): ? ? ? #strings are taken directly
> > Originally: ? ? if type(port) in [type(''), type(u'')]
> > ? ? ? ? ? ? ? ? self.portstr = port
> > ? ? ? ? ? ? else:
> > ? ? ? ? ? ? ? ? self.portstr = self.makeDeviceName(port)
>
> str and bytes are two totally unrelated things in Python 3.0. You can no
> longer treat them equally like str and unicode in Python 2.x. Your could
> should not work under Python 3.0 anyway. u'' is invalid in 3.x.
>
> Also please don't use ugly type checks like type(something) == type('').
> Starting with Python 2.2 you should use isinstance, for example
> isinstance(number, (int, long)).
>
> Christian



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:16:47 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:16:47 -0200
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.744.1235576012.11746.python-list@python.org>
	<49a568f8$0$656$9b622d9e@news.freenet.de>
Message-ID: <op.upw0t9hrx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 13:51:20 -0200, Christian Meesters <meesters at gmx.de>  
escribi?:

>>> I have a problem using my software on my 64bit laptop, after an update
>>> of my system. The same code still runs on 32bit Intel, but on my laptop
>>> I provoke the crash in the title. The crash is caused - as narrowed
>>> down by me - by returning a static PyObject from a C-extension
>>> function.
>>
>> I think you got all the reference counts wrong, specially dummy1, dummy2
>> and r.
> Might be a good point, but can you give me a hint where to look
> specifically?

   /* parse the input arguments r & vectors */
   if (!PyArg_ParseTuple(args, "OO", &r, &py_vectors))
     return NULL;
   ...

   for (i=0; i < vsize; i++) {
     ...
     dummy_2 = PyList_GetItem(dummy_1, 0);
     ...
   }
   ...

   /* copy all items from pofr to py_pofr to be returned */
   if (!(py_pofr = PyList_New(0)))  return NULL;
   for (i=0; i < rlen; i++) {
     dummy_1 = Py_BuildValue("i", pofr[i]);
     if (!dummy_1) return NULL;
     PyList_Append(py_pofr, dummy_1);
     Py_CLEAR(dummy_1);
   }

   /* reference counters to zero */
   Py_CLEAR(dummy_1);
   Py_CLEAR(dummy_2);
   Py_CLEAR(r);


r is an argument, a borrowed reference; you can't Py_CLEAR it.
dummy_1 is decremented inside the loop, and again three lines below.
dummy_2 is used far above the final Py_CLEAR, and it comes from  
PyList_GetItem, which returns a borrowed reference - you can't decrement  
it either.
Also there are several "return NULL" that don't decrement active objects  
(like "if (!dummy_1)..." above)

Getting the reference count right is critical: if you err by +1, the  
object will never be destroyed (leaking memory). If you err by -1, the  
object will be still in use after it was destroyed.

-- 
Gabriel Genellina



From meesters at gmx.de  Wed Feb 25 11:17:28 2009
From: meesters at gmx.de (Christian Meesters)
Date: 25 Feb 2009 16:17:28 GMT
Subject: How to convert image into numpy.ndarray
References: <4e80357e-039e-4165-bd73-c23603a0299a@r34g2000vbp.googlegroups.com>
Message-ID: <49a56f18$0$656$9b622d9e@news.freenet.de>

On Wed, 25 Feb 2009 07:52:03 -0800, anti-suho wrote:

> In scipy module, there is a function named misc.lena which can return an
> array of numpy.ndarray type. If you use this array as parameter of
> matplotlib.pyplot.imshow and then call the matplotlib.pyplot.imshow
> function, an image will be shown. The shown image is generated by the
> numpy.ndarray array.
> 
> How to convert an arbitrary image into an array of numpy.ndarray type?
Well, arbitrary ...

But this may serve as a starting point:

from scipy.misc import fromimage
import Image #PIL
my_array = fromimage(Image.open(_file_name_))

Of course, you should perform the appropriate error checking, too. ;-)

HTH
Christian




From music24by7 at gmail.com  Wed Feb 25 11:17:40 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 08:17:40 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
Message-ID: <9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>

On Feb 25, 8:57?pm, Steve Holden <st... at holdenweb.com> wrote:
> music24... at gmail.com wrote:
> > Hi all,
>
> > I am new to Python, i have installed python 2.5.4 and it is my
> > requirement.
>
> > I need to retrieve the path of filename in python.
>
> > I have found some API's to get this:
>
> > from os.path import realpath
> > print realpath("NEWS.txt") ?# here NEWS.txt exists and it shows the
> > path of the file as C:\Python25\WorkSpace\NEWS.txt
> > print realpath("abc.txt") # here abc.txt does not exist but still it
> > shows C:\Python25\WorkSpace\abc.txt
>
> > can anybody tell the reason why????
>
> > Now took some safety measures:
>
> > found = lexists(realpath(filename))
> > ? ? ? ? if found == 0:
> > ? ? ? ? ? ? print "Not Found"
> > ? ? ? ? else:
> > ? ? ? ? ? ? print realpath(filename)
>
> > i have given the filename as "NEWS.txt" and "abc.txt" but i am always
> > getting the output as "Not Found"
>
> > Can anyone please tell me where am i doing wrong????
>
> It seems pretty apparent that lexists() nevert returns a true result.
>
> Why not just
>
> if os.path.exists(filename):
> ? ? print os.path.realpath(filename)
> else:
> ? ? print "Not found"
>
> > also any suggestions to retrieve the filepath from a given filename is
> > highly appreciated.
>
> Well, realpath returns the path of the file targeted after any symbolic
> links have been evaluated, which may or may not be what you want. Have
> you looked at os.path.abspath?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/



Hi Steve,

I have tried your suggested code and also replaced os.path.realpath
with os.path.abspath but still getting the same result.
I want to know is there any workaround for retrieving the filepaths
given only filename

Regards,
Sudhir


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 11:23:32 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 14:23:32 -0200
Subject: Convert PySerial to python 3.0
References: <385a617c-1e43-4828-8edd-3f4aadce8604@c11g2000yqj.googlegroups.com>
	<mailman.704.1235534148.11746.python-list@python.org>
	<f7e15868-39df-42c2-866f-9604005935be@q9g2000yqc.googlegroups.com>
	<mailman.732.1235569640.11746.python-list@python.org>
	<ae9482a8-d513-4b22-b370-e6bacd00b7d9@p11g2000yqe.googlegroups.com>
	<mailman.739.1235574990.11746.python-list@python.org>
	<67d9d270-afad-4c4a-a585-81544ef66670@x13g2000yqf.googlegroups.com>
Message-ID: <op.upw05isxx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 14:07:30 -0200, Seth <king.seth at gmail.com> escribi?:

> This is not my code and I am fairly new to Python.  I did not know how
> much it would take to convert pyserial to 3.0. Someone more
> knowledgeable than me could do it better and faster.  I just want to
> see if I could help get it to work.

The last commit to pyserial repository was 8 days ago, so it's not like an  
abandoned project.
Have you contacted the author?

That said, Python 3.0 is still very recent and doesn't have a big set of  
3rd party libraries as earlier versions. Maybe you should stick to 2.6 or  
even 2.5 for a while.

-- 
Gabriel Genellina



From Shawn at Milochik.com  Wed Feb 25 11:29:25 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 11:29:25 -0500
Subject: "Battleship" style game
Message-ID: <2dc0c81b0902250829x500b8f4ald1e67bb3c5aecf51@mail.gmail.com>

I started learning Java for fun, and the first project assignment in
the book is to create a game like "Battleship." So, of course, I wrote
it in Python first, just for fun. I haven't had the time to look up
all the Java syntax.

So, here it is, fully functional. I thought I'd throw it out there and
see if anyone would like to offer any useful tips. I'm not claiming
it's bulletproof, but it works. I just kind of came up with all the
methods off of the top of my head, so if anyone has any suggestions
for more elegant or efficient code, please let me know.

http://shawnmilo.com/ships/

Thanks,
Shawn


From marco at sferacarta.com  Wed Feb 25 11:38:05 2009
From: marco at sferacarta.com (Marco Mariani)
Date: Wed, 25 Feb 2009 17:38:05 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.750.1235579371.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>
Message-ID: <Otepl.44730$8Z.9486@tornado.fastwebnet.it>

Shawn Milochik wrote:

 > I'm not claiming it's bulletproof, but it works. I just kind of came 
up with all the
> methods off of the top of my head, so if anyone has any suggestions
> for more elegant or efficient code, please let me know.

Yes it's in Python alright, but it's not Pythonese yet. You could try 
avoiding the getter/setter stuff, and camelCase method naming, things 
like that, for a start.



From Shawn at Milochik.com  Wed Feb 25 11:50:18 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 11:50:18 -0500
Subject: "Battleship" style game
In-Reply-To: <Otepl.44730$8Z.9486@tornado.fastwebnet.it>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
Message-ID: <2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>

On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com> wrote:
>
> Yes it's in Python alright, but it's not Pythonese yet. You could try
> avoiding the getter/setter stuff, and camelCase method naming, things like
> that, for a start.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


What do you mean avoiding the getter/setter stuff? If I understand
correctly, you're saying to directly access the attributes, which I
specifically want to avoid because I may want to enforce some rules
(such as not changing a ship length after it's created).

The camel-case thing I get -- I use that and this_type quite a bit,
probably because of the inconsistency of the languages I use
regularly, and standards at work and conventions in my hobby
programming.


From steve at holdenweb.com  Wed Feb 25 11:59:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 11:59:32 -0500
Subject: File Path retrieving problem
In-Reply-To: <9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
Message-ID: <go3tdu$sm9$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 25, 8:57 pm, Steve Holden <st... at holdenweb.com> wrote:
>> music24... at gmail.com wrote:
>>> Hi all,
>>> I am new to Python, i have installed python 2.5.4 and it is my
>>> requirement.
>>> I need to retrieve the path of filename in python.
>>> I have found some API's to get this:
>>> from os.path import realpath
>>> print realpath("NEWS.txt")  # here NEWS.txt exists and it shows the
>>> path of the file as C:\Python25\WorkSpace\NEWS.txt
>>> print realpath("abc.txt") # here abc.txt does not exist but still it
>>> shows C:\Python25\WorkSpace\abc.txt
>>> can anybody tell the reason why????
>>> Now took some safety measures:
>>> found = lexists(realpath(filename))
>>>         if found == 0:
>>>             print "Not Found"
>>>         else:
>>>             print realpath(filename)
>>> i have given the filename as "NEWS.txt" and "abc.txt" but i am always
>>> getting the output as "Not Found"
>>> Can anyone please tell me where am i doing wrong????
>> It seems pretty apparent that lexists() nevert returns a true result.
>>
>> Why not just
>>
>> if os.path.exists(filename):
>>     print os.path.realpath(filename)
>> else:
>>     print "Not found"
>>
>>> also any suggestions to retrieve the filepath from a given filename is
>>> highly appreciated.
>> Well, realpath returns the path of the file targeted after any symbolic
>> links have been evaluated, which may or may not be what you want. Have
>> you looked at os.path.abspath?
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> 
> 
> Hi Steve,
> 
> I have tried your suggested code and also replaced os.path.realpath
> with os.path.abspath but still getting the same result.
> I want to know is there any workaround for retrieving the filepaths
> given only filename
> 
What, you are saying that

  os.path.exists(filename)

is returning false when the file exists? I find that hard to believe.

Please display some evidence so I can understand this.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From thorsten at thorstenkampe.de  Wed Feb 25 12:01:08 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 18:01:08 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
Message-ID: <MPG.240f97c1205218339897cd@news.individual.de>

* Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
> <thorsten at thorstenkampe.de> escribi?:
> > * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
> >> Thanks, RDM, for stating the right approach.
> >> Thanks, Steve, for teaching by example.
> >>
> >> I wonder why the email.message_from_string() method doesn't call
> >> email.header.decode_header() automatically.
> >
> > And I wonder why you would think the header contains Unicode characters
> > when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> > to label everything "Unicode" someone does not understand.
> 
> And I wonder why you would think the header does *not* contain Unicode  
> characters when it says "us-ascii"?.

Basically because it didn't contain any Unicode characters (anything 
outside the ASCII range).

Thorsten


From steve at holdenweb.com  Wed Feb 25 12:01:21 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:01:21 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
Message-ID: <go3thb$sm9$2@ger.gmane.org>

Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com> wrote:
>> Yes it's in Python alright, but it's not Pythonese yet. You could try
>> avoiding the getter/setter stuff, and camelCase method naming, things like
>> that, for a start.
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> 
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).
> 
If you wanted to enforce those restrictions you could just turn
attributes into properties.

> The camel-case thing I get -- I use that and this_type quite a bit,
> probably because of the inconsistency of the languages I use
> regularly, and standards at work and conventions in my hobby
> programming.

PEP 008 is the usual style recommendation.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 12:07:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 15:07:07 -0200
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
Message-ID: <op.upw255p0x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 14:50:18 -0200, Shawn Milochik <Shawn at milochik.com>  
escribi?:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <marco at sferacarta.com>  
> wrote:
>>
>> Yes it's in Python alright, but it's not Pythonese yet. You could try
>> avoiding the getter/setter stuff, and camelCase method naming, things  
>> like
>> that, for a start.
>
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).

I think Marco Mariani was suggesting something like this:

class Ship(object):

     def __init__(self, length):
         self._length = length

     def get_length(self):
         return self._length
     length = property(get_length)  # a read only property

-- 
Gabriel Genellina



From __peter__ at web.de  Wed Feb 25 12:18:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 25 Feb 2009 18:18:11 +0100
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
Message-ID: <go3ugf$ol7$03$1@news.t-online.com>

Steve Holden wrote:

> What, you are saying that
> 
> os.path.exists(filename)
> 
> is returning false when the file exists? I find that hard to believe.
> 
> Please display some evidence so I can understand this.

Maybe it's about access rights?

$ mkdir alpha
$ touch alpha/beta
$ python -c"import os; print os.path.exists('alpha/beta')"
True
$ chmod u-x alpha
$ python -c"import os; print os.path.exists('alpha/beta')"
False
$

I Don't know how this is handled on Windows...

Peter


From mail at timgolden.me.uk  Wed Feb 25 12:27:07 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 25 Feb 2009 17:27:07 +0000
Subject: How do I decode unicode characters in the subject
	using	email.message_from_string()?
In-Reply-To: <MPG.240f97c1205218339897cd@news.individual.de>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>	<mailman.740.1235575045.11746.python-list@python.org>	<MPG.240f84deef77395e9897cc@news.individual.de>	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
Message-ID: <49A57F6B.7090501@timgolden.me.uk>

Thorsten Kampe wrote:
> * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
>> <thorsten at thorstenkampe.de> escribi?:
>>> * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>>>> Thanks, RDM, for stating the right approach.
>>>> Thanks, Steve, for teaching by example.
>>>>
>>>> I wonder why the email.message_from_string() method doesn't call
>>>> email.header.decode_header() automatically.
>>> And I wonder why you would think the header contains Unicode characters
>>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
>>> to label everything "Unicode" someone does not understand.
>> And I wonder why you would think the header does *not* contain Unicode  
>> characters when it says "us-ascii"?.
> 
> Basically because it didn't contain any Unicode characters (anything 
> outside the ASCII range).

And I imagine that Gabriel's point was -- and my point certainly
is -- that Unicode includes all the characters *inside* the
ASCII range.


TJG


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 12:36:22 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 15:36:22 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
Message-ID: <op.upw4iwh5x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 15:01:08 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:
> * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe
>> <thorsten at thorstenkampe.de> escribi?:
>> > * Roy H. Han (Wed, 25 Feb 2009 10:17:22 -0500)
>> >> Thanks, RDM, for stating the right approach.
>> >> Thanks, Steve, for teaching by example.
>> >>
>> >> I wonder why the email.message_from_string() method doesn't call
>> >> email.header.decode_header() automatically.
>> >
>> > And I wonder why you would think the header contains Unicode  
>> characters
>> > when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
>> > to label everything "Unicode" someone does not understand.
>>
>> And I wonder why you would think the header does *not* contain Unicode
>> characters when it says "us-ascii"?.
>
> Basically because it didn't contain any Unicode characters (anything
> outside the ASCII range).

I think you have to revise your definition of "Unicode".

-- 
Gabriel Genellina



From blank at empty.blank  Wed Feb 25 12:36:37 2009
From: blank at empty.blank (RGK)
Date: Wed, 25 Feb 2009 12:36:37 -0500
Subject: coding style - try, except
Message-ID: <go3vj6$2mq$1@theodyn.ncf.ca>


I'm still learning, so eager to see if there is some community wisdom 
about use of the try/except structures in this situation.

I find myself with some potentially risky stuff and wrap it in a 
try/except structure with good functional results, though my code leaves 
me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.

Consider

   try:
     do something 1
     do something 2
     do something 3
     do something 4
     ...
     do something 25

   except:
     print "Oops something didn't work"


The risky things are just 1 & 2, and the others are not of concern, but 
are dependent on 1 & 2.  The alternative is to do:

   wentOkay = True
   try:
     do something 1
     do something 2

   except:
     print "Oops something didn't work"
     wentOkay = False

   if wentOkay:
     do something 3
     do something 4
      ...
     do something 25


Which seems a bit verbose, but likely the better approach.  Is there 
some other option I should be considering?

Any input appreciated :)

Ross.



From rdmurray at bitdance.com  Wed Feb 25 12:44:18 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Wed, 25 Feb 2009 17:44:18 +0000 (UTC)
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<go3nra$71j$1@ger.gmane.org>
Message-ID: <go401h$7d7$1@ger.gmane.org>

Steve Holden <steve at holdenweb.com> wrote:
> rdmurray at bitdance.com wrote:
> > Steve Holden <steve at holdenweb.com> wrote:
> >>>>> from email.header import decode_header
> >>>>> print
> >> decode_header("=?us-ascii?Q?Inteum_C/SR_User_Tip:__Quick_Access_to_Recently_Opened_Inteu?=\r\n\t=?us-ascii?Q?m_C/SR_Records?=")
> >> [('Inteum C/SR User Tip:  Quick Access to Recently Opened Inteum C/SR
> >> Records', 'us-ascii')]
> > 
> > It is interesting that decode_header does what I would consider to be
> > the right thing (from a pragmatic standpoint) with that particular bit
> > of Microsoft not-quite-standards-compliant brain-damage; but, removing
> > the tab is not in fact standards compliant if I'm reading the RFC
> > correctly.
> > 
> You'd need to quote me chapter and verse on that. I understood that the
> tab simply indicated continuation, but it's a *long* time since I read
> the RFCs.

Tab is not mentioned in RFC 2822 except to say that it is a valid
whitespace character.  Header folding (insertion of <cr><lf>) can
occur most places whitespace appears, and is defined in section
2.2.3 thusly:

   Each header field is logically a single line of characters comprising
   the field name, the colon, and the field body.  For convenience
   however, and to deal with the 998/78 character limitations per line,
   the field body portion of a header field can be split into a multiple
   line representation; this is called "folding".  The general rule is
   that wherever this standard allows for folding white space (not
   simply WSP characters), a CRLF may be inserted before any WSP.  For
   example, the header field:

           Subject: This is a test

   can be represented as:

           Subject: This
            is a test

   [irrelevant note elided]

   The process of moving from this folded multiple-line representation
   of a header field to its single line representation is called
   "unfolding". Unfolding is accomplished by simply removing any CRLF
   that is immediately followed by WSP.  Each header field should be
   treated in its unfolded form for further syntactic and semantic
   evaluation.

So, the whitespace characters are supposed to be left unchanged
after unfolding.

--David



From steve at holdenweb.com  Wed Feb 25 12:51:34 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:51:34 -0500
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
In-Reply-To: <go401h$7d7$1@ger.gmane.org>
References: <mailman.694.1235520485.11746.python-list@python.org>	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>	<go3hnd$dj0$1@ger.gmane.org>	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>	<49A553A5.4050309@holdenweb.com>
	<go3lrt$und$1@ger.gmane.org>	<go3nra$71j$1@ger.gmane.org>
	<go401h$7d7$1@ger.gmane.org>
Message-ID: <go40fh$8gr$1@ger.gmane.org>

rdmurray at bitdance.com wrote:
[...]
> 
>    The process of moving from this folded multiple-line representation
>    of a header field to its single line representation is called
>    "unfolding". Unfolding is accomplished by simply removing any CRLF
>    that is immediately followed by WSP.  Each header field should be
>    treated in its unfolded form for further syntactic and semantic
>    evaluation.
> 
> So, the whitespace characters are supposed to be left unchanged
> after unfolding.
> 
That would certainly appear to be the case. Thanks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From loluengo at gmail.com  Wed Feb 25 12:51:55 2009
From: loluengo at gmail.com (Lorenzo)
Date: Wed, 25 Feb 2009 09:51:55 -0800 (PST)
Subject: This application has failed to start because the application 
	configuration is incorrect
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com> 
	<mailman.157.1234910674.11746.python-list@python.org>
Message-ID: <d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>

On 17 feb, 19:44, Mark Hammond <skippy.hamm... at gmail.com> wrote:
> On 18/02/2009 5:49 AM, Sam Clark wrote:
>
> > I am receiving the message "Thisapplicationhasfailedtostartbecause
> > theapplicationconfiguration is incorrect" when I attempt to run a
> > compiled Python program on another machine. I have used py2exe on both a
> > 2.6.1 and a 2.6.0 version of the .py and .pyw files. Everything works
> > great on the machine where Python 2.6 is loaded, but fails on machines
> > where I copy the .exe to the machine. I'm a beginner at python
> > programming. In fact this is my first packaged program. Any thoughts at
> > a beginners level would be helpful.
>
> This will be due to the C runtime library not being installed correctly
> on the target machine. ?

I had the same issue. After looking some "patch" solutions of putting
manually some dlls on the dist folder, I realized that you can fix it
by installing one of these packages, see which one fits your system:
x86
http://www.microsoft.com/downloads/details.aspx?familyid=A5C84275-3B97-4AB7-A40D-3802B2AF5FC2&displaylang=en

x64
http://www.microsoft.com/downloads/details.aspx?familyid=BA9257CA-337F-4B40-8C14-157CFDFFEE4E&displaylang=en

PS: Mark, this could be added to a kind of "Deployment" entry in
py2exe wiki, it would be useful.


From steve at holdenweb.com  Wed Feb 25 12:53:46 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 12:53:46 -0500
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <go40jl$8gr$2@ger.gmane.org>

RGK wrote:
> 
> I'm still learning, so eager to see if there is some community wisdom
> about use of the try/except structures in this situation.
> 
> I find myself with some potentially risky stuff and wrap it in a
> try/except structure with good functional results, though my code leaves
> me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.
> 
> Consider
> 
>   try:
>     do something 1
>     do something 2
>     do something 3
>     do something 4
>     ...
>     do something 25
> 
>   except:
>     print "Oops something didn't work"
> 
> 
> The risky things are just 1 & 2, and the others are not of concern, but
> are dependent on 1 & 2.  The alternative is to do:
> 
>   wentOkay = True
>   try:
>     do something 1
>     do something 2
> 
>   except:
>     print "Oops something didn't work"
>     wentOkay = False
> 
>   if wentOkay:
>     do something 3
>     do something 4
>      ...
>     do something 25
> 
> 
> Which seems a bit verbose, but likely the better approach.  Is there
> some other option I should be considering?
> 
> Any input appreciated :)
> 
The first form is far preferable: it expresses the logic directly and
clearly, and is much easier to read than the second, which I personally
find somewhat contorted.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From duncan-news at grisby.org  Wed Feb 25 12:55:44 2009
From: duncan-news at grisby.org (Duncan Grisby)
Date: Wed, 25 Feb 2009 17:55:44 GMT
Subject: glibc detected *** python: corrupted double-linked list
References: <49a53c36$0$713$9b622d9e@news.freenet.de>
	<mailman.730.1235567202.11746.python-list@python.org>
Message-ID: <ACfpl.43277$1M5.3814@newsfe24.ams2>

In article <mailman.730.1235567202.11746.python-list at python.org>,
David Cournapeau  <cournape at gmail.com> wrote:

[...]
>It is very unlikely the problem is in glibc - I would check your code
>carefully first :) On Linux, the following are useful:

You are right that it is extremely unlikely that the bug is in glibc.
However, it is not impossible. Several of my colleagues and I spent
months trying to track down a bug where Python would occasionally
crash with a segfault while iterating through large lists. Of course
the problem only ever happened on customer sites, and not in our lab.
I eventually tracked it down to a bug in glibc's realloc()
implementation, where once in a blue moon it would fail to copy all
the data into the newly-allocated buffer.

It turned out to be a bug that had been found before, but had been
closed as invalid a few months earlier:

  http://sources.redhat.com/bugzilla/show_bug.cgi?id=5743

The fix had then been applied about a week before I found it myself.

I'm not sure that particular fix has found it into any of the major
Linux distributions yet.

Cheers,

Duncan.

-- 
 -- Duncan Grisby         --
  -- duncan at grisby.org     --
   -- http://www.grisby.org --


From __peter__ at web.de  Wed Feb 25 13:07:11 2009
From: __peter__ at web.de (Peter Otten)
Date: Wed, 25 Feb 2009 19:07:11 +0100
Subject: coding style - try, except
References: <go3vj6$2mq$1@theodyn.ncf.ca>
	<mailman.759.1235584507.11746.python-list@python.org>
Message-ID: <go41ca$ghs$01$1@news.t-online.com>

Steve Holden wrote:

> RGK wrote:
>> 
>> I'm still learning, so eager to see if there is some community wisdom
>> about use of the try/except structures in this situation.
>> 
>> I find myself with some potentially risky stuff and wrap it in a
>> try/except structure with good functional results, though my code leaves
>> me a bit uneasy. Maybe it's just esoteric, but your input is appreciated.
>> 
>> Consider
>> 
>>   try:
>>     do something 1
>>     do something 2
>>     do something 3
>>     do something 4
>>     ...
>>     do something 25
>> 
>>   except:
>>     print "Oops something didn't work"

If you don't want a specific treatment for errors anticipated in 1 and 2
there's no need for try...except at this level at all. Just pass control up
the stack.

>> The risky things are just 1 & 2, and the others are not of concern, but
>> are dependent on 1 & 2.  The alternative is to do:
>> 
>>   wentOkay = True
>>   try:
>>     do something 1
>>     do something 2
>> 
>>   except:
>>     print "Oops something didn't work"
>>     wentOkay = False
>> 
>>   if wentOkay:
>>     do something 3
>>     do something 4
>>      ...
>>     do something 25
>> 
>> 
>> Which seems a bit verbose, but likely the better approach.  Is there
>> some other option I should be considering?
>> 
>> Any input appreciated :)
>> 
> The first form is far preferable: it expresses the logic directly and
> clearly, and is much easier to read than the second, which I personally
> find somewhat contorted.

How about

try:
    # do something that may fail in a way you anticipate
    do something 1
    do something 2
except SpecificError:
    deal with the problem or reraise
else:
    # no errors above
    do something 3...25

Peter


From clp2 at rebertia.com  Wed Feb 25 13:08:55 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 25 Feb 2009 10:08:55 -0800
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <50697b2c0902251008u1756435tac03b3322e5a694a@mail.gmail.com>

On Wed, Feb 25, 2009 at 9:36 AM, RGK <blank at empty.blank> wrote:
>
> I'm still learning, so eager to see if there is some community wisdom about
> use of the try/except structures in this situation.
>
> I find myself with some potentially risky stuff and wrap it in a try/except
> structure with good functional results, though my code leaves me a bit
> uneasy. Maybe it's just esoteric, but your input is appreciated.
>
> Consider
>
> ?try:
> ? ?do something 1
> ? ?do something 2
> ? ?do something 3
> ? ?do something 4
> ? ?...
> ? ?do something 25
>
> ?except:
> ? ?print "Oops something didn't work"
>
>
> The risky things are just 1 & 2, and the others are not of concern, but are
> dependent on 1 & 2. ?The alternative is to do:
>
> ?wentOkay = True
> ?try:
> ? ?do something 1
> ? ?do something 2
>
> ?except:
> ? ?print "Oops something didn't work"
> ? ?wentOkay = False
>
> ?if wentOkay:
> ? ?do something 3
> ? ?do something 4
> ? ? ...
> ? ?do something 25
>
>
> Which seems a bit verbose, but likely the better approach. ?Is there some
> other option I should be considering?

Yes. try-except-*else*.

try:
    do_something_1()
    do_something_2()
except:
    print "Houston, we have a problem"
else: #runs only if no exception was thrown
    do_something_3()
    do_something_4()
    et_cetera()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From xahlee at gmail.com  Wed Feb 25 13:18:17 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 25 Feb 2009 10:18:17 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com>
Message-ID: <15818a58-bcc6-4163-982f-d5534b087a6c@o36g2000yqh.googlegroups.com>

On Feb 25, 3:34 am, nick_keighley_nos... at hotmail.com wrote:
> the nasty cons then only appears in a single function which
> you can hide in a library

I think the following answers that.

Q: If you don't like cons, lisp has arrays and hashmaps, too.

A: Suppose there's a lang called gisp. In gisp, there's cons but also
fons. Fons are just like cons except it has 3 cells with 3 accessors:
car, cbr, cdr. Now, gisp is a old lang, the fons are deeply rooted in
the lang. Every some 100 lines of code you'll see a use of fons with
its extra accessor cbr, or any one of the cbaar, cdabr, cbbar, cbbbar,
etc. You got annoyed by this. You as a critic, complains that fons is
bad. But then some gisp fanatics retorts: ?If you don't like fons,
gisp has cons, too!?.

You see, by ?having something too?, does not solve the problem of
pollution. Sure, you can use just cons in gisp, but every lib or
other's code you encounter, there's a invasion of fons with its cbar,
cbbar, cbbbar. The problem created by fons does not go away by ?having
cons too?.

above is from

? Fundamental Problems of Lisp
  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html

---------

> I read it. Your point seems to be "cons becomes difficult
> with deeply nested structures". Could you give an example?

There are few examples in these articles:

? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
Nested Notations
  http://xahlee.org/UnixResource_dir/writ/notations.html

the above, 3rd section, gives detail about the problems of fully
nested syntax. In particular, it shows a source code snippet of
language with fully nested syntax, but is not lisp, so that lispers
can get a fresh impression.

? A Ruby Illustration of Lisp Problems
  http://xahlee.org/UnixResource_dir/writ/lisp_problems_by_ruby.html

the above, is a concrete example of showing how full nesting is
cumbersome, by constrasting a simple program in Ruby and lisp.

? Why Lisp Do Not Have A Generic Copy-List Function
  http://xahlee.org/UnixResource_dir/writ/lisp_equal_copy_list.html

the above, shows the cons problem, by looking Kent Pitman's article
with a different perspective.

A short Plain Text Excerpt of the ruby article cited above follows.
------------------------------

More specifically, 2 fundamental problems of lisp i feel this ruby
example illustrates well:

? the cons impedes many aspects of lists. e.g. difficult to learn,
confusing, hard to use, prevent development of coherent list
manipulation functions.

? nested syntax impedes the functional programing paradigm of function
chaining, esp when each function has 2 or more arguments (e.g. map).

here's a short summary of the nesting problem:

(map f x) ; 1 level of chaining
(map g (map f x)) ; 2 levels
(map h (map g (map f x))) ; 3 levels

compare:

x | f | g | h   ----> unix pipe
x // f // g // h   ----> Mathematica
h @ g @ f @ x    ----> Mathematica
x.f.g.h        -------> various OOP langs, esp Ruby, javascript
h g f x       -------> some functional langs, Haskell, Ocaml

The way the above works is that each of f, g, h is a lambda themselves
that maps. (that is, something like ?(lambda (y) (map f y))?)

Note, that any of the f, g, h may be complex pure functions (aka
lambda).  Because in lisp, each lambda itself will in general have
quite a lot nested parens (which cannot be avoided), so this makes any
chaining of functions of 2 args, for more than 2 or 3 levels of
nesting, unusable for practical coding. One must define the functions
separately and just call their names, or use function composition with
lambda (which gets complex quickly). One major aspect of this problem
is that the scope of vars becomes hard to understand in the deep
nested source code. This is worse in elisp, because emacs is
dynamically scoped, so you have to avoid using var of same name.

 Xah
?http://xahlee.org/

?



From thorsten at thorstenkampe.de  Wed Feb 25 13:19:35 2009
From: thorsten at thorstenkampe.de (Thorsten Kampe)
Date: Wed, 25 Feb 2009 19:19:35 +0100
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
	<mailman.755.1235582817.11746.python-list@python.org>
Message-ID: <MPG.240faa1e187165a99897ce@news.individual.de>

* Tim Golden (Wed, 25 Feb 2009 17:27:07 +0000)
> Thorsten Kampe wrote:
> > * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
> >> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe  
[...]
> >>> And I wonder why you would think the header contains Unicode characters
> >>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a tendency
> >>> to label everything "Unicode" someone does not understand.
> >> And I wonder why you would think the header does *not* contain Unicode  
> >> characters when it says "us-ascii"?.
> > 
> > Basically because it didn't contain any Unicode characters (anything 
> > outside the ASCII range).
> 
> And I imagine that Gabriel's point was -- and my point certainly
> is -- that Unicode includes all the characters *inside* the
> ASCII range.

I know that this was Gabriel's point. And my point was that Gabriel's 
point was pointless. If you call any text (or character) "Unicode" then 
the word "Unicode" is generalized to an extent where it doesn't mean 
anything at all anymore and becomes a buzz word.

With the same reason you could call ASCII an Unicode encoding (which it 
isn't) because all ASCII characters are Unicode characters (code 
points). Only encodings that cover the full Unicode range can reasonably 
be called Unicode encodings.

The OP just saw some "weird characters" in the email subject and thought 
"I know. It looks weird. Must be Unicode". But it wasn't. It was good 
ole ASCII - only Quoted Printable encoded.


Thorsten


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 13:21:58 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 16:21:58 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<go3nra$71j$1@ger.gmane.org> <go401h$7d7$1@ger.gmane.org>
Message-ID: <op.upw6mwchx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 15:44:18 -0200, <rdmurray at bitdance.com> escribi?:

> Tab is not mentioned in RFC 2822 except to say that it is a valid
> whitespace character.  Header folding (insertion of <cr><lf>) can
> occur most places whitespace appears, and is defined in section
> 2.2.3 thusly: [...]
> So, the whitespace characters are supposed to be left unchanged
> after unfolding.

Yep, there is an old bug report sleeping in the tracker about this...

-- 
Gabriel Genellina



From Scott.Daniels at Acm.Org  Wed Feb 25 13:22:46 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Wed, 25 Feb 2009 10:22:46 -0800
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <SMidnb1GXJFHFjjUnZ2dnUVZ_gKWnZ2d@pdx.net>

RGK wrote:
> I'm still learning, so eager to see if there is some community wisdom 
> about use of the try/except structures in this situation....
>   try:
>     do something 1
>     do something 2
>     do something 3
>     do something 4
>     ...
>     do something 25
>   except:
>     print "Oops something didn't work"
> 
> The risky things are just 1 & 2, and the others are not of concern, but 
> are dependent on 1 & 2.  The alternative is to do:
> 
>   wentOkay = True
>   try:
>     do something 1
>     do something 2
>   except:
>     print "Oops something didn't work"
>     wentOkay = False
>   if wentOkay:
>     do something 3
>     do something 4
>      ...
>     do something 25
> Which seems a bit verbose, but likely the better approach.  Is there 
> some other option I should be considering?
What's wrong with:
     try:
         do something 1
         do something 2
     except (AttributeError, ValueError), why: # Don't use bare except
         print "Oops something didn't work: %s" % why
     else:
         do something 3
         do something 4
         ...
         do something 25
--Scott David Daniels
Scott.Daniels at Acm.Org


From lists at cheimes.de  Wed Feb 25 13:26:23 2009
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 25 Feb 2009 19:26:23 +0100
Subject: coding style - try, except
In-Reply-To: <go3vj6$2mq$1@theodyn.ncf.ca>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
Message-ID: <go42gf$gc9$1@ger.gmane.org>

RGK wrote:
> Any input appreciated :)

How about:

import logging

try:
   # run your function
   some_function()
except Exception:
   # except only the exceptions you *really* want to catch
   # at most you should except "Exception" since it doesn't
   # catch KeyboardInterrupt and SystemExit
   logging.exception("An error has occured")
   # logging is preferred over a simple print because it
   # also prints out a nice traceback
else:
   # the else block is reached when no exception has occured
   some_other()
finally:
   # the finally block is *always* executed at least
   # use it to clean up some resources
   some_cleanup_code()

Christian



From Shawn at Milochik.com  Wed Feb 25 13:33:48 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 13:33:48 -0500
Subject: "Battleship" style game
In-Reply-To: <op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <2dc0c81b0902251033m79dd4157x401283d993214e4@mail.gmail.com>

Thanks. I wasn't aware of the property() function, but I read up on
it. I modified the Vessels.py file, but not the board file (except
where necessary to handle the changes made to Vessels. Is this better?

http://shawnmilo.com/ships/ships2/


From chrysn at fsfe.org  Wed Feb 25 13:48:16 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Wed, 25 Feb 2009 19:48:16 +0100
Subject: variables bound in moudules are None when module is not
	completely imported
In-Reply-To: <20090224142719.GA27379@hephaistos.amsuess.com>
References: <20090224142719.GA27379@hephaistos.amsuess.com>
Message-ID: <20090225184816.GC28923@hephaistos.amsuess.com>

On Tue, Feb 24, 2009 at 03:27:19PM +0100, chrysn at fsfe.org wrote:
> * is there a workaround?
>     * especially, is there a workaround that works w/o rewriting the
>       modules that raise the exceptions? (otherwise, wrapping all the
>       stuff called in the __name__=="__main__" wrapper into a main()
>       function and then calling that would trivially solve that)

update: i've found one, but this only works if the exception is raised
at a point determined by the outside.

to explain why this is applicable: in the examples, i used `1/0` to
raise a zero division exception inside the module whose scope i want to
preserve. in my practical application, the exception is thrown by a
function that was previously prepared by the outside module and monkey
patched to where the inner module is expected to call a method from (in
my case, the gtk main loop).

now if the function raising the exception saves both
`sys._getframe().f_back.f_globals` and a .copy() of that dictionary, the
original dictionary can later (when the exception is caught and the
module's globals are all None) be .update()d with the copy, and the
original module globals are restored.

as said, this is just a workaround -- the original question still
remains open.

regards
chrysn

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From gagsl-py2 at yahoo.com.ar  Wed Feb 25 13:59:17 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 16:59:17 -0200
Subject: How do I decode unicode characters in the subject using
	email.message_from_string()?
References: <mailman.694.1235520485.11746.python-list@python.org>
	<44432eaa-372e-45d2-baa2-da350a371d70@x9g2000yqk.googlegroups.com>
	<go3hnd$dj0$1@ger.gmane.org>
	<6a5569ec0902250609l243089d9g330ef2f578569499@mail.gmail.com>
	<49A553A5.4050309@holdenweb.com> <go3lrt$und$1@ger.gmane.org>
	<mailman.740.1235575045.11746.python-list@python.org>
	<MPG.240f84deef77395e9897cc@news.individual.de>
	<mailman.747.1235577642.11746.python-list@python.org>
	<MPG.240f97c1205218339897cd@news.individual.de>
	<mailman.755.1235582817.11746.python-list@python.org>
	<MPG.240faa1e187165a99897ce@news.individual.de>
Message-ID: <op.upw8c3jkx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 16:19:35 -0200, Thorsten Kampe  
<thorsten at thorstenkampe.de> escribi?:
> * Tim Golden (Wed, 25 Feb 2009 17:27:07 +0000)
>> Thorsten Kampe wrote:
>> > * Gabriel Genellina (Wed, 25 Feb 2009 14:00:16 -0200)
>> >> En Wed, 25 Feb 2009 13:40:31 -0200, Thorsten Kampe
> [...]
>> >>> And I wonder why you would think the header contains Unicode  
>> characters
>> >>> when it says "us-ascii" ("=?us-ascii?Q?"). I think there is a  
>> tendency
>> >>> to label everything "Unicode" someone does not understand.
>> >> And I wonder why you would think the header does *not* contain  
>> Unicode
>> >> characters when it says "us-ascii"?.
>> >
>> > Basically because it didn't contain any Unicode characters (anything
>> > outside the ASCII range).
>>
>> And I imagine that Gabriel's point was -- and my point certainly
>> is -- that Unicode includes all the characters *inside* the
>> ASCII range.
>
> I know that this was Gabriel's point. And my point was that Gabriel's
> point was pointless. If you call any text (or character) "Unicode" then
> the word "Unicode" is generalized to an extent where it doesn't mean
> anything at all anymore and becomes a buzz word.

If it's text, it should use Unicode. Maybe not now, but in a few years, it  
will be totally unacceptable not to properly use Unicode to process  
textual data.

> With the same reason you could call ASCII an Unicode encoding (which it
> isn't) because all ASCII characters are Unicode characters (code
> points). Only encodings that cover the full Unicode range can reasonably
> be called Unicode encodings.

Not at all. ASCII is as valid as character encoding ("coded character set"  
as the Unicode guys like to say) as ISO 10646 (which covers the whole  
range).

> The OP just saw some "weird characters" in the email subject and thought
> "I know. It looks weird. Must be Unicode". But it wasn't. It was good
> ole ASCII - only Quoted Printable encoded.

Good f*cked ASCII is Unicode too.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Feb 25 14:05:28 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 17:05:28 -0200
Subject: variables bound in moudules are None when module is not
	completely imported
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
Message-ID: <op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 16:48:16 -0200, <chrysn at fsfe.org> escribi?:

> update: i've found one, but this only works if the exception is raised
> at a point determined by the outside.
>
> to explain why this is applicable: in the examples, i used `1/0` to
> raise a zero division exception inside the module whose scope i want to
> preserve. in my practical application, the exception is thrown by a
> function that was previously prepared by the outside module and monkey
> patched to where the inner module is expected to call a method from (in
> my case, the gtk main loop).
>
> now if the function raising the exception saves both
> `sys._getframe().f_back.f_globals` and a .copy() of that dictionary, the
> original dictionary can later (when the exception is caught and the
> module's globals are all None) be .update()d with the copy, and the
> original module globals are restored.

That makes a strange situation where the module doesn't exist in  
sys.modules but its globals are still alive...

> as said, this is just a workaround -- the original question still
> remains open.

I'd try to move all the global stuff in that module into a function,  
"init". Importing the module will always succeed - you have to manually  
call init() after importing it.

-- 
Gabriel Genellina



From aisaac at american.edu  Wed Feb 25 14:07:54 2009
From: aisaac at american.edu (Alan G Isaac)
Date: Wed, 25 Feb 2009 14:07:54 -0500
Subject: Free Python Training: Washington, DC (3/3-5)
In-Reply-To: <go3k62$lvs$1@panix3.panix.com>
References: <mailman.729.1235566709.11746.python-list@python.org>
	<go3k62$lvs$1@panix3.panix.com>
Message-ID: <mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>

Great idea, but if you do it again, a bit
more lead time would be helpful.

Cheers,
Alan Isaac


From blank at empty.blank  Wed Feb 25 14:12:01 2009
From: blank at empty.blank (RGK)
Date: Wed, 25 Feb 2009 14:12:01 -0500
Subject: coding style - try, except
In-Reply-To: <mailman.760.1235585341.11746.python-list@python.org>
References: <go3vj6$2mq$1@theodyn.ncf.ca>
	<mailman.760.1235585341.11746.python-list@python.org>
Message-ID: <go4562$5va$1@theodyn.ncf.ca>


I'm glad I asked :)

Thanks all who posted for your replies, the else-statement is a nice 
option.

Python again comes through to deal with those pesky feelings that 
something could be better :)

Ross.



Chris Rebert wrote:

> Yes. try-except-*else*.
> 
> try:
>     do_something_1()
>     do_something_2()
> except:
>     print "Houston, we have a problem"
> else: #runs only if no exception was thrown
>     do_something_3()
>     do_something_4()
>     et_cetera()
> 
> Cheers,
> Chris
> 


From steve at holdenweb.com  Wed Feb 25 14:31:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 14:31:49 -0500
Subject: Free Python Training: Washington, DC (3/3-5)
In-Reply-To: <mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>
References: <mailman.729.1235566709.11746.python-list@python.org>	<go3k62$lvs$1@panix3.panix.com>
	<mKSdnXu816-TCjjUnZ2dnUVZ_j6WnZ2d@rcn.net>
Message-ID: <go46bh$vhl$1@ger.gmane.org>

Alan G Isaac wrote:
> Great idea, but if you do it again, a bit
> more lead time would be helpful.
> 
Appreciate that. Last-minute idea.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From deets at nospam.web.de  Wed Feb 25 15:15:40 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 25 Feb 2009 21:15:40 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.763.1235586832.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
Message-ID: <70ln7dFcv6phU1@mid.uni-berlin.de>

Shawn Milochik schrieb:
> Thanks. I wasn't aware of the property() function, but I read up on
> it. I modified the Vessels.py file, but not the board file (except
> where necessary to handle the changes made to Vessels. Is this better?
> 
> http://shawnmilo.com/ships/ships2/


Not really. The point about properties is that you *can* make attribute 
access trigger getter or setter code.

But not that you do unless there is an actual reason for that. The way 
you do it now is simply introducing clutter, without benefit. Your class 
would be half the current size - without loss of functionality.



Diez


From martin at v.loewis.de  Wed Feb 25 15:19:41 2009
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Wed, 25 Feb 2009 21:19:41 +0100
Subject: Python dictionary size/entry limit?
In-Reply-To: <49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>
References: <a3ffb09d-90c4-4198-a6ab-1758abf64711@w1g2000prk.googlegroups.com>
	<49a1b17d$0$28748$9b622d9e@news.freenet.de>
	<49a55813$0$30232$9b4e6d93@newsspool1.arcor-online.net>
Message-ID: <49a5a7dd$0$30218$9b622d9e@news.freenet.de>

>> On a 32-bit system, the dictionary can have up to 2**31 slots,
>> meaning that the maximum number of keys is slightly smaller
>> (about 2**30).
> 
> Which, in practice, means that the size is limited by the available memory.

Right. Each slot takes 12 bytes, so the storage for the slots alone
would consume all available address space.

>From that point of view, you can't possibly have more than 314M slots
in a 32-bit address space (roughly 2**28).

Regards,
Martin


From vincent at vincentdavis.net  Wed Feb 25 15:20:28 2009
From: vincent at vincentdavis.net (Vincent Davis)
Date: Wed, 25 Feb 2009 13:20:28 -0700
Subject: PYTHONPATH on Mac 10.5
Message-ID: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>

I have looked around for a good howto setup PYTHONPATH on Mac os x
10.5 Although I get many results I am not sure which is correct. I am not
sure if it is different for 10.5 over previous versions. Does anyone know of
a well documented set of instructions.
In my python scripts I specify which python I want to use like this
#!/Library/Frameworks/Python.framework/Versions/4.1.30101/bin/python

Is there a way to specify a module location or working directory? Which is
best? Or should I just add location to PYTHONPATH?


Thanks
Vincent Davis
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From irmen.NOSPAM at xs4all.nl  Wed Feb 25 15:39:57 2009
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Wed, 25 Feb 2009 21:39:57 +0100
Subject: Python Image Library IOError - cannot find JPEG decoder?
In-Reply-To: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
References: <mailman.674.1235496906.11746.python-list@python.org>
	<179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
Message-ID: <49a5aca0$0$193$e4fe514c@news.xs4all.nl>

wongobongo wrote:
> On Feb 24, 9:34 am, Dario Traverso <traver... at gmail.com> wrote:
>> I've been trying to install the Python Image Library  (PIL) on my Mac  
>> OSX Leopard laptop, but have been running into some difficulties.
>>
>> I've built the library, using the included setup.py  script. The build  
>> summary checks out ok, and sounds the option libraries to all be  
>> found. I grabbed both libjpeg and freetype2  using  fink.
>>

I did a similar thing, but not using Fink, on my mac (running osx 10.4)
I documented the procedure I had to take to get it to work:
http://www.razorvine.net/frog/user/irmen/article/2008-08-02/127

It's in Dutch but you can probably figure it out.
I guess since you were on 10.5 that you have to adapt the
'DEPLOMENT_TARGET' variable in a suitable manner.

Hope it helps,

--irmen


From bdesth.quelquechose at free.quelquepart.fr  Wed Feb 25 15:48:45 2009
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 25 Feb 2009 21:48:45 +0100
Subject: python sql query in django
In-Reply-To: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
Message-ID: <49a5bc40$0$2662$426a74cc@news.free.fr>

May a ?crit :
> On Feb 24, 10:36 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>> Thanks for all your suggestions.  From what I've experienced in Django
>>> and now that I know a little more about how Python functions, I will
>>> probably use a combination of PHP and Django, instead of trying to get
>>> Python to do the web portion of my project.  Thanks again!
>> That sounds like the worst idea. Django's ORM is good when used from
>> within django, because of all the additional goodies like the admin
>> interface.
>>
>> But if you are going to do the webfrontend using PHP, what part is left
>> for django? If it's only the ORM (for whatever you still use that
>> anyway), there are better alternatives - SQLAlchemy, and SQLObject, for
>> Python. They are more powerful and not interwoven with django.
>>
>> If you are going to hand-code the interface in PHP, I fail to see though
>> why you don't do that in Django directly. You are not forced to use the
>> Admin-interface.
>>
>> Diez
> 
> Hello Diez,
> 
> I think Django is fabulous for the admin-interface, a simple text
> search and template inheritance. 

And I think you really don't get what Django is good for.

> I will use Django for all of those.
> What I'm not getting an answer to and cannot find an example of is a
> complex search, where I have to retrieve data from multiple tables,
> combine the data, remove the duplicates, etc 

Django's ORM is mostly a wrapper above the db-api. It's intended to make 
most common db access a no-brainer, not to replace full-blown SQL for 
complex things. Now the good news is that you *still* can drop to a 
lower raw-sql level - the one you'd get using either PHP or Python's 
db-api - for more complex things. IOW, PHP won't buy you anything here.

>  The code that started this thread is only a small piece
> of the complex data retrieval I need to do.

The "code that started this thread" is a total no-brainer using Django 
(as you would know by now if you had reposted your question on django's 
group - or even just read the FineManual, where this use case is fully 
documented), and doesn't even require going down to raw sql.

>  PHP is great for writing
> complex SQL queries right in the HTML template

What the .... a complex SQL query has to do in a template anyway ??? 
Sorry, but what you're saying here is that PHP is great for writing 
unmaintainable spaghetti code. FWIW, even PHP coders are trying to get 
out of this kind of mess nowadays.



From Shawn at Milochik.com  Wed Feb 25 15:54:46 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Wed, 25 Feb 2009 15:54:46 -0500
Subject: "Battleship" style game
In-Reply-To: <70ln7dFcv6phU1@mid.uni-berlin.de>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
Message-ID: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>

On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:

> Not really. The point about properties is that you *can* make attribute
> access trigger getter or setter code.
>
> But not that you do unless there is an actual reason for that. The way you
> do it now is simply introducing clutter, without benefit. Your class would
> be half the current size - without loss of functionality.
>
>
>
> Diez
> --
> http://mail.python.org/mailman/listinfo/python-list
>

It is true that it would be fewer lines of code with the same
functionality, but it's better practice to have that framework in
place so that any changes made in the future wouldn't break any of the
code accessing my class. Obviously this is a fairly simple game that
has a fixed set of rules, but I'm trying to cultivate good habits, and
I don't think that doing it this way is anti-Pythonic.

Unless, of course, anything I said is wrong, which is always possible.
If I'm missing a bigger-picture idea, I'd like to know about it.

Thanks,
Shawn


From steve at holdenweb.com  Wed Feb 25 16:07:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 16:07:36 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>	<mailman.763.1235586832.11746.python-list@python.org>	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <go4bv6$lu8$1@ger.gmane.org>

Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.
> 
The point of using property() is that you can start out using attribute
access on its own (which is the standard Python way to do things:
getters and setters are seen by most as redundant code).

Once you need programmed access on read and/or write, leave the client
code (the code that accesses the attributes) as it is, but turn the
attributes into properties so that the functions are invoked
automatically on attribute-style access.

So I believe what Diez was saying is that by using properties in your
existing code you are getting the worst of both worlds - unnecessarily
complex objects, and code that uses those objects by calling methods
when it could be accessing attributes (or properties - depending on the
implementation). At least this is true of your Ship test code.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From jcd at sdf.lonestar.org  Wed Feb 25 16:14:58 2009
From: jcd at sdf.lonestar.org (J. Cliff Dyer)
Date: Wed, 25 Feb 2009 16:14:58 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <1235596498.7621.8.camel@aalcdl07>

On Wed, 2009-02-25 at 15:54 -0500, Shawn Milochik wrote:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
> > Not really. The point about properties is that you *can* make attribute
> > access trigger getter or setter code.
> >
> > But not that you do unless there is an actual reason for that. The way you
> > do it now is simply introducing clutter, without benefit. Your class would
> > be half the current size - without loss of functionality.
> >
> >
> >
> > Diez
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.
> 

The piece you're missing is exactly why properties are so cool.

They take what looks like attribute access from the client side, and
pass it through a method.  So while you can add any sort of changes you
want to make can be made without breaking any client code.  To them, it
still looks like attribute access.

class Foo(object):
    a = 4

class Bar(object):
    def __init__(self):
        self._a = 4

    def _get_a(self):
        return self._a

    def _set_a(self, value):
        if not value % 2:
            self._a = value
    a = property(_get_a, _set_a)

>>> foo = Foo()
>>> foo.a
4
>>> foo.a = 5
>>> foo.a
5
>>> bar = Bar()
>>> bar.a
4
>>> bar.a = 5
>>> bar.a
4
>>> bar.a = 6
>>> bar.a
6

> Thanks,
> Shawn
> --
> http://mail.python.org/mailman/listinfo/python-list
> 



From deets at nospam.web.de  Wed Feb 25 16:32:53 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 25 Feb 2009 22:32:53 +0100
Subject: "Battleship" style game
In-Reply-To: <mailman.769.1235595290.11746.python-list@python.org>
References: <mailman.750.1235579371.11746.python-list@python.org>	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>	<mailman.763.1235586832.11746.python-list@python.org>	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<mailman.769.1235595290.11746.python-list@python.org>
Message-ID: <70lro5Fdnc6aU1@mid.uni-berlin.de>

Shawn Milochik schrieb:
> On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
> 
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.
> 
> Unless, of course, anything I said is wrong, which is always possible.
> If I'm missing a bigger-picture idea, I'd like to know about it.

You miss that Java has no properties, and thus forces prorgammers to 
wrap all attribute-access into getter/setters - just in case one wants 
something other than pure attribute access in some distant future to come.

In Python this is not needed. If something starts as an attribute, and 
then evolves so that it needs more complex logic when being accessed, 
you introduce a property of the same name.


Don't waste time coding for a future you can't even pretend to know. Do 
what is needed to solve the actual problem.


Diez


From emile at fenx.com  Wed Feb 25 16:35:34 2009
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 25 Feb 2009 13:35:34 -0800
Subject: File Path retrieving problem
In-Reply-To: <go3ugf$ol7$03$1@news.t-online.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com>
Message-ID: <go4djd$s0j$1@ger.gmane.org>

Peter Otten wrote:
> Maybe it's about access rights?
> 
> $ mkdir alpha
> $ touch alpha/beta
> $ python -c"import os; print os.path.exists('alpha/beta')"
> True
> $ chmod u-x alpha
> $ python -c"import os; print os.path.exists('alpha/beta')"
> False
> $
> 
> I Don't know how this is handled on Windows...
> 

Here's one way....

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\>mkdir alpha
C:\>touch alpha\beta  # cygwin at work here...

C:\>python -c"import os; print os.path.exists('alpha/beta')"
True

C:\>cacls alpha /E /R "Everyone"
processed dir: C:\alpha
C:\>cacls alpha /E /R "Users"
processed dir: C:\alpha
C:\>cacls alpha /E /R "Administrators"
processed dir: C:\alpha

C:\>python -c"import os; print os.path.exists('alpha/beta')"
False



From invalid at invalid  Wed Feb 25 16:39:09 2009
From: invalid at invalid (Grant Edwards)
Date: Wed, 25 Feb 2009 15:39:09 -0600
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<mailman.769.1235595290.11746.python-list@python.org>
	<70lro5Fdnc6aU1@mid.uni-berlin.de>
Message-ID: <LN2dnfGSU8TgJzjUnZ2dnUVZ_sLinZ2d@posted.visi>

On 2009-02-25, Diez B. Roggisch <deets at nospam.web.de> wrote:

> Don't waste time coding for a future you can't even pretend to
> know. Do what is needed to solve the actual problem.

Premature obfuscation is even worse than premature optimization.

-- 
Grant Edwards                   grante             Yow! Well, O.K.
                                  at               I'll compromise with my
                               visi.com            principles because of
                                                   EXISTENTIAL DESPAIR!


From Olivier.Darge at gmail.com  Wed Feb 25 17:03:22 2009
From: Olivier.Darge at gmail.com (OdarR)
Date: Wed, 25 Feb 2009 14:03:22 -0800 (PST)
Subject: Python Image Library IOError - cannot find JPEG decoder?
References: <mailman.674.1235496906.11746.python-list@python.org>
Message-ID: <f86fbd98-a000-4c71-ad08-ac5d22bf8162@q9g2000yqc.googlegroups.com>

On 24 f?v, 18:34, Dario Traverso <traver... at gmail.com> wrote:
> I've been trying to install the Python Image Library ?(PIL) on my Mac ?
> OSX Leopard laptop, but have been running into some difficulties.
>
> I've built the library, using the included setup.py ?script. The build ?
> summary checks out ok, and sounds the option libraries to all be ?
> found. I grabbed both libjpeg and freetype2 ?using ?fink.

I did'nt build it, maybe you don't want too.
I used the PIL package for Python 2.5 listed here:
http://pythonmac.org/packages/py25-fat/index.html


hth,
Olivier


From mobiledreamers at gmail.com  Wed Feb 25 17:24:55 2009
From: mobiledreamers at gmail.com (mobiledreamers at gmail.com)
Date: Wed, 25 Feb 2009 14:24:55 -0800
Subject: [Tutor] Accessing callers context from callee method
In-Reply-To: <78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>
References: <c1870d60902241053l5bfbdd97p9ef6c61452147a18@mail.gmail.com>
	<78b3a9580902241159g3add4898na23151ebe6c0f987@mail.gmail.com>
Message-ID: <c1870d60902251424x3a499dc3t3b0b1274e7859e9e@mail.gmail.com>

i found the solution
This is my first attempt at memcaching html page using cheetah
since cheetah render needs locals() i use getCallerInfo() to get the
locals() and send to memcached
let me know if it is possible to better do this
*notice getCallerInfo
*

*utils.py*
@log_time_func
def renderpage(key, htmlfile, deleteafter=3600):
    from globaldb import mc
    try:page = mc.get(key)
    except:
        page=None
        clogger.info('except error mc.get '+ key)
    if not page:
        clogger.info(key+ ' rendering cheetah page')
        terms = getCallerInfo(1)
        #print terms
        page = str(web.render(htmlfile, asTemplate=True, terms=terms))
        try:mc.set(key, page, deleteafter)
        except:
            clogger.info('except error mc.set '+ key)
    return page

@log_time_func
@memcachethis
def mcrenderpage(key, htmlfile, deleteafter=3600):
    terms = getCallerInfo(2)
    #print terms
    return str(web.render(htmlfile, asTemplate=True, terms=terms))

def getCallerInfo(decorators=0):
    '''returns locals of caller using frame.optional pass number of
decorators\nFrom Dig deep into python internals
http://www.devx.com/opensource/Article/31593/1954'<http://www.devx.com/opensource/Article/31593/1954%27>
''
    f = sys._getframe(2+decorators)
    args = inspect.getargvalues(f)
    return args[3]

*Usage*
        key=facebookstuff.APP_NAME+'newstart'+str(uid)
        return utils.renderpage(key, 'pick.html')



-- 
Bidegg worlds best auction site
http://bidegg.com
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From exarkun at divmod.com  Wed Feb 25 17:31:55 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Wed, 25 Feb 2009 17:31:55 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <20090225223155.12853.747455496.divmod.quotient.13878@henry.divmod.com>

On Wed, 25 Feb 2009 15:54:46 -0500, Shawn Milochik <shawn at milochik.com> wrote:
>On Wed, Feb 25, 2009 at 3:15 PM, Diez B. Roggisch <deets at nospam.web.de> wrote:
>
>> Not really. The point about properties is that you *can* make attribute
>> access trigger getter or setter code.
>>
>> But not that you do unless there is an actual reason for that. The way you
>> do it now is simply introducing clutter, without benefit. Your class would
>> be half the current size - without loss of functionality.
>>
>>
>>
>> Diez
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>It is true that it would be fewer lines of code with the same
>functionality, but it's better practice to have that framework in
>place so that any changes made in the future wouldn't break any of the
>code accessing my class. Obviously this is a fairly simple game that
>has a fixed set of rules, but I'm trying to cultivate good habits, and
>I don't think that doing it this way is anti-Pythonic.
>
>Unless, of course, anything I said is wrong, which is always possible.
>If I'm missing a bigger-picture idea, I'd like to know about it.

Much better practice would be writing unit tests for the behavior you
want.  This is a vastly greater measure of protection against future
maintenance introducing bugs than the restrictions you're adding to
your implementation.  So if you're looking for good habits to pick up,
start with unit testing.  Your test.py files show you're at least
thinking about testing, but you should take a look at something like
the `unittest? module in the standard library and take things to the
next level.

Jean-Paul


From steve at pearwood.info  Wed Feb 25 18:08:25 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Thu, 26 Feb 2009 10:08:25 +1100
Subject: variable length tuple assignment
References: <70kgjnFbqktdU1@mid.dfncis.de>
	<50697b2c0902250141s3f19a31eye857c4a637f0d7ff@mail.gmail.com>
	<mailman.726.1235561721.11746.python-list@python.org>
Message-ID: <01b5c4c2$0$20652$c3e8da3@news.astraweb.com>

Tim Chase wrote:

> As an aside, as of the last time I read the PEP[1] on this, I
> believe it exhausts (or attempts to exhaust) any iterator.  IMHO,
> I think this exhausting is a bad idea because it prevents things like
> 
>    def numbers(start=0):
>      i = start
>      while True:
>        yield i
>        i += 1
> 
>    CONST_A, CONST_B, CONST_C, *rest = numbers()
> 
> which will hang in current Py3.0 until you blow a stack or
> overrun your heap somewhere because it will try to exhaust the
> infinite loop.  

But what else can it do? Do you expect Python to read your mind and
magically know when you intend to use rest and when you're intending to
just throw it away?

Perhaps Python could do that, via static analysis -- if rest is never used
again, don't bother exhausting the iterator. But that will lead to
differences in iterators that have side-effects. It will also have a subtle
difference in behaviour here:

it = xrange(5)  # for example
a, b, c, *rest = it
L = list(it)  # L is now [3, 4]

versus

a, b, c, *rest = xrange(5)
parrot(rest)
L = list(it)  # L is now []


> It also changes the type from iter() to list() 
> for the remaining content (not as grevious).

But that's what unpacking does. It would be a major semantic change for 

x, *s = some_iterator

to make s an alias of some_iterator. And why would you want it to? If you
do, just do this:

x, s = some_iterator.next(), some_iterator



-- 
Steven



From deets at nospam.web.de  Wed Feb 25 18:12:33 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 26 Feb 2009 00:12:33 +0100
Subject: python sql query in django
In-Reply-To: <66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
Message-ID: <70m1j1Fe33teU1@mid.uni-berlin.de>

> I think Django is fabulous for the admin-interface, a simple text
> search and template inheritance.  I will use Django for all of those.
> What I'm not getting an answer to and cannot find an example of is a
> complex search, where I have to retrieve data from multiple tables,
> combine the data, remove the duplicates, etc between a web page and
> the database.  The code that started this thread is only a small piece
> of the complex data retrieval I need to do.  PHP is great for writing
> complex SQL queries right in the HTML template and I know exactly what
> it is doing.

First of all, mixing technologies without need is most of the times a 
bad idea - so if it is really the case that you can't solve all of your 
issues in django, you shouldn't use it at all, but solve them in PHP.


But to be honest - I doubt that django isn't capable of solving your 
problem.

See

http://docs.djangoproject.com/en/dev/topics/db/queries/#topics-db-queries

for a introduction to the multitude of query-options. I doubt that your 
rather simple m:n-relationship is covered there.


I myself use SQLAlchemy, and that can for sure query and filter those 
relationships.

Diez


From deets at nospam.web.de  Wed Feb 25 18:14:28 2009
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 26 Feb 2009 00:14:28 +0100
Subject: python sql query in django
In-Reply-To: <70m1j1Fe33teU1@mid.uni-berlin.de>
References: <9c401cce-88c3-48b1-a6a5-288d2b897ba3@v19g2000yqn.googlegroups.com>
	<49a3071a$0$18735$426a34cc@news.free.fr>
	<c89b7fd2-33a8-403b-a813-fbdf7c997266@j38g2000yqa.googlegroups.com>
	<mailman.570.1235423121.11746.python-list@python.org>
	<f4ae7b6d-a5f8-47fe-b56e-4cd75a285560@v15g2000yqn.googlegroups.com>
	<49a31936$0$24803$426a74cc@news.free.fr>
	<fdc1f38c-4e6d-441d-a611-7577c569956b@a12g2000yqm.googlegroups.com>
	<70it1cF95tgfU1@mid.uni-berlin.de>
	<66633e7f-0f8c-472e-9e9d-5930042d7626@g38g2000yqd.googlegroups.com>
	<70m1j1Fe33teU1@mid.uni-berlin.de>
Message-ID: <70m1mkFe33teU2@mid.uni-berlin.de>


> for a introduction to the multitude of query-options. I doubt that your 
> rather simple m:n-relationship is covered there.

s/is/isn't/

Diez



From chrysn at fsfe.org  Wed Feb 25 18:24:33 2009
From: chrysn at fsfe.org (chrysn at fsfe.org)
Date: Thu, 26 Feb 2009 00:24:33 +0100
Subject: variables bound in moudules are None when module is not
	completely imported
In-Reply-To: <op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
	<op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
Message-ID: <20090225232433.GD28923@hephaistos.amsuess.com>

On Wed, Feb 25, 2009 at 05:05:28PM -0200, Gabriel Genellina wrote:
> I'd try to move all the global stuff in that module into a function,  
> "init". Importing the module will always succeed - you have to manually  
> call init() after importing it.

i normally do that anyway and would also have done so here (afaik, it's
best practice anyway), but this is in this case not possible as the
modules in question are not under my control at all. as pep 299 has been
turned down, this can't really be considered a bug of those files.

anyway, it would just be another workaround around the globals
disappearing.

> That makes a strange situation where the module doesn't exist in  
> sys.modules but its globals are still alive...

is this a known bug? i mean from a garbage collection / refcount point
of view, at least everything that is still referenced somewhere should
be preserved.

thanks
chrysn

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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From LuHe at gmx.at  Wed Feb 25 18:57:25 2009
From: LuHe at gmx.at (Lukas Hetzenecker)
Date: Thu, 26 Feb 2009 00:57:25 +0100
Subject: logging.Handler not working with QThreads
Message-ID: <200902251627.16827.LuHe@gmx.at>

Hello,

I created a QTextEdit where I wanted to display log messages.
A logging.Handler should do this job.

It worked with one thread well, but when I start a QThread the text on all 
widgets is removed and I get many errors in my konsole:

X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0

.. and so on

I attatched a small example to this mail.

Could anybody tell me what I'm doing wrong?
Thanks for you help,
Lukas


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From skippy.hammond at gmail.com  Wed Feb 25 19:35:55 2009
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Thu, 26 Feb 2009 11:35:55 +1100
Subject: This application has failed to start because the application
	configuration is incorrect
In-Reply-To: <d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>
References: <822B0E83D23291469317E34324687437022249@production.2000soft.com>
	<mailman.157.1234910674.11746.python-list@python.org>
	<d18cdb46-85c0-4969-b4c5-7731cceeab0d@e18g2000vbe.googlegroups.com>
Message-ID: <49A5E3EB.6090907@gmail.com>

On 26/02/2009 4:51 AM, Lorenzo wrote:

> PS: Mark, this could be added to a kind of "Deployment" entry in
> py2exe wiki, it would be useful.

IIRC, I've never edited the py2exe wiki (despite appearances to the 
contrary sometimes, I don't formally maintain that package!).

But that is the cool thing about Wiki's - *anyone* can add such 
information ;)

Cheers,

Mark


From xahlee at gmail.com  Wed Feb 25 19:46:52 2009
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 25 Feb 2009 16:46:52 -0800 (PST)
Subject: reading file to list
References: <Xns9B959D84F96C1drkrausemindspringco@216.168.3.70> 
	<d4e3a435-f8f9-45e2-a120-1b4264aceddf@f24g2000vbf.googlegroups.com> 
	<gkrra30272q@enews2.newsguy.com>
	<54a7d868-34ec-4ba6-a244-f0475d245f31@z27g2000prd.googlegroups.com>
	<c9d61235-aade-4d83-95fe-09d33b5132e0@z9g2000yqi.googlegroups.com> 
	<15818a58-bcc6-4163-982f-d5534b087a6c@o36g2000yqh.googlegroups.com>
Message-ID: <ac261796-b664-42fe-ae4a-0d1a10fd31b0@j38g2000yqa.googlegroups.com>

On Feb 25, 10:18 am, Xah Lee <xah... at gmail.com> wrote:
> On Feb 25, 3:34 am, nick_keighley_nos... at hotmail.com wrote:
>
> > the nasty cons then only appears in a single function which
> > you can hide in a library
>
> I think the following answers that.
>
> Q: If you don't like cons, lisp has arrays and hashmaps, too.
>
> A: Suppose there's a lang called gisp. In gisp, there's cons but also
> fons. Fons are just like cons except it has 3 cells with 3 accessors:
> car, cbr, cdr. Now, gisp is a old lang, the fons are deeply rooted in
> the lang. Every some 100 lines of code you'll see a use of fons with
> its extra accessor cbr, or any one of the cbaar, cdabr, cbbar, cbbbar,
> etc. You got annoyed by this. You as a critic, complains that fons is
> bad. But then some gisp fanatics retorts: ?If you don't like fons,
> gisp has cons, too!?.
>
> You see, by ?having something too?, does not solve the problem of
> pollution. Sure, you can use just cons in gisp, but every lib or
> other's code you encounter, there's a invasion of fons with its cbar,
> cbbar, cbbbar. The problem created by fons does not go away by ?having
> cons too?.
>
> above is from
>
> ? Fundamental Problems of Lisp
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems.html
>
> ---------
>
> > I read it. Your point seems to be "cons becomes difficult
> > with deeply nested structures". Could you give an example?
>
> There are few examples in these articles:
>
> ? The Concepts and Confusions of Prefix, Infix, Postfix and Fully
> Nested Notations
>  http://xahlee.org/UnixResource_dir/writ/notations.html
>
> the above, 3rd section, gives detail about the problems of fully
> nested syntax. In particular, it shows a source code snippet of
> language with fully nested syntax, but is not lisp, so that lispers
> can get a fresh impression.
>
> ? A Ruby Illustration of Lisp Problems
>  http://xahlee.org/UnixResource_dir/writ/lisp_problems_by_ruby.html
>
> the above, is a concrete example of showing how full nesting is
> cumbersome, by constrasting a simple program in Ruby and lisp.
>
> ? Why Lisp Do Not Have A Generic Copy-List Function
>  http://xahlee.org/UnixResource_dir/writ/lisp_equal_copy_list.html
>
> the above, shows the cons problem, by looking Kent Pitman's article
> with a different perspective.
>
> A short Plain Text Excerpt of the ruby article cited above follows.
> ------------------------------
>
> More specifically, 2 fundamental problems of lisp i feel this ruby
> example illustrates well:
>
> ? the cons impedes many aspects of lists. e.g. difficult to learn,
> confusing, hard to use, prevent development of coherent list
> manipulation functions.
>
> ? nested syntax impedes the functional programing paradigm of function
> chaining, esp when each function has 2 or more arguments (e.g. map).
>
> here's a short summary of the nesting problem:
>
> (map f x) ; 1 level of chaining
> (map g (map f x)) ; 2 levels
> (map h (map g (map f x))) ; 3 levels
>
> compare:
>
> x | f | g | h   ----> unix pipe
> x // f // g // h   ----> Mathematica
> h @ g @ f @ x    ----> Mathematica
> x.f.g.h        -------> various OOP langs, esp Ruby, javascript
> h g f x       -------> some functional langs, Haskell, Ocaml
>
> The way the above works is that each of f, g, h is a lambda themselves
> that maps. (that is, something like ?(lambda (y) (map f y))?)
>
> Note, that any of the f, g, h may be complex pure functions (aka
> lambda).  Because in lisp, each lambda itself will in general have
> quite a lot nested parens (which cannot be avoided), so this makes any
> chaining of functions of 2 args, for more than 2 or 3 levels of
> nesting, unusable for practical coding. One must define the functions
> separately and just call their names, or use function composition with
> lambda (which gets complex quickly). One major aspect of this problem
> is that the scope of vars becomes hard to understand in the deep
> nested source code. This is worse in elisp, because emacs is
> dynamically scoped, so you have to avoid using var of same name.


Here's a actual lisp code. I don't consider it readable, due to the
profusion of parens.

(defun lisp-complete-symbol (&optional predicate)
  "Perform completion on Lisp symbol preceding point.
Compare that symbol against the known Lisp symbols.
If no characters can be completed, display a list of possible
completions.
Repeating the command at that point scrolls the list.

When called from a program, optional arg PREDICATE is a predicate
determining which symbols are considered, e.g. `commandp'.
If PREDICATE is nil, the context determines which symbols are
considered.  If the symbol starts just after an open-parenthesis, only
symbols with function definitions are considered.  Otherwise, all
symbols with function definitions, values or properties are
considered."
  (interactive)
  (let ((window (get-buffer-window "*Completions*" 0)))
    (if (and (eq last-command this-command)
	     window (window-live-p window) (window-buffer window)
	     (buffer-name (window-buffer window)))
	;; If this command was repeated, and
	;; there's a fresh completion window with a live buffer,
	;; and this command is repeated, scroll that window.
	(with-current-buffer (window-buffer window)
	  (if (pos-visible-in-window-p (point-max) window)
	      (set-window-start window (point-min))
	    (save-selected-window
	      (select-window window)
	      (scroll-up))))

      ;; Do completion.
      (let* ((end (point))
	     (beg (with-syntax-table emacs-lisp-mode-syntax-table
		    (save-excursion
		      (backward-sexp 1)
		      (while (= (char-syntax (following-char)) ?\')
			(forward-char 1))
		      (point))))
	     (pattern (buffer-substring-no-properties beg end))
	     (predicate
	      (or predicate
		  (save-excursion
		    (goto-char beg)
		    (if (not (eq (char-before) ?\())
			(lambda (sym)	;why not just nil ?   -sm
			  (or (boundp sym) (fboundp sym)
			      (symbol-plist sym)))
		      ;; Looks like a funcall position.  Let's double check.
		      (if (condition-case nil
			      (progn (up-list -2) (forward-char 1)
				     (eq (char-after) ?\())
			    (error nil))
			  ;; If the first element of the parent list is an open
			  ;; parenthesis we are probably not in a funcall position.
			  ;; Maybe a `let' varlist or something.
			  nil
			;; Else, we assume that a function name is expected.
			'fboundp)))))
	     (completion (try-completion pattern obarray predicate)))
	(cond ((eq completion t))
	      ((null completion)
	       (message "Can't find completion for \"%s\"" pattern)
	       (ding))
	      ((not (string= pattern completion))
	       (delete-region beg end)
	       (insert completion)
	       ;; Don't leave around a completions buffer that's out of date.
	       (let ((win (get-buffer-window "*Completions*" 0)))
		 (if win (with-selected-window win (bury-buffer)))))
	      (t
	       (let ((minibuf-is-in-use
		      (eq (minibuffer-window) (selected-window))))
		 (unless minibuf-is-in-use
		   (message "Making completion list..."))
		 (let ((list (all-completions pattern obarray predicate)))
		   (setq list (sort list 'string<))
		   (or (eq predicate 'fboundp)
		       (let (new)
			 (while list
			   (setq new (cons (if (fboundp (intern (car list)))
					       (list (car list) " <f>")
					     (car list))
					   new))
			   (setq list (cdr list)))
			 (setq list (nreverse new))))
		   (if (> (length list) 1)
		       (with-output-to-temp-buffer "*Completions*"
			 (display-completion-list list pattern))
		     ;; Don't leave around a completions buffer that's
		     ;; out of date.
		     (let ((win (get-buffer-window "*Completions*" 0)))
		       (if win (with-selected-window win (bury-buffer))))))
		 (unless minibuf-is-in-use
		   (message "Making completion list...%s" "done")))))))))

  Xah
? http://xahlee.org/

?


From philip at semanchuk.com  Wed Feb 25 19:48:04 2009
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 25 Feb 2009 19:48:04 -0500
Subject: PYTHONPATH on Mac 10.5
In-Reply-To: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
References: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
Message-ID: <C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>


On Feb 25, 2009, at 3:20 PM, Vincent Davis wrote:

> I have looked around for a good howto setup PYTHONPATH on Mac os x
> 10.5 Although I get many results I am not sure which is correct. I  
> am not
> sure if it is different for 10.5 over previous versions. Does anyone  
> know of
> a well documented set of instructions.
>
> Is there a way to specify a module location or working directory?  
> Which is
> best? Or should I just add location to PYTHONPATH?


Hi Vincent,
There are different instructions on how to set PYTHONPATH because it  
solves a problem (how to organize one's Python modules) that has more  
than one solution. It's sort of like asking "How should I organize my  
email?" Different strokes for different folks.

Me, I don't use PYTHONPATH at all. Most of the stuff I want to import  
is already available in site-packages. If not, I can add a .pth file  
to site-packages that tells Python where to find the source. You can  
read about .pth files here:
http://docs.python.org/library/site.html


> In my python scripts I specify which python I want to use like this
> #!/Library/Frameworks/Python.framework/Versions/4.1.30101/bin/python

Yikes! Your scripts won't be too portable then, will they? I'm on OS X  
10.5 and I don't have a directory like that. A common, more portable  
alternative is this:

#!/usr/bin/env python

That relies (obviously) on /usr/bin/env being present which means that  
your scripts won't work on Windows machines, for instance. But it's a  
whole lot more portable than what you've got now. You don't need a  
shebang line at all if you're willing to launch your scripts by typing  
`python foo.py` at the command line. That will merely execute  
whichever python appears first in your path. I used to always use the / 
usr/bin/env shebang line that I described above, but I do so less  
often now. It's one less dependency to deal with.

So, in short, PYTHONPATH doesn't need to be set at all, and you can  
switch the shebang line to this:

#!/usr/bin/env python

Or do away with it entirely.

This isn't a complete answer but has it been at least somewhat helpful?

Cheers
Philip








From rhodri at wildebst.demon.co.uk  Wed Feb 25 20:11:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 26 Feb 2009 01:11:49 -0000
Subject: pep 8 constants
In-Reply-To: <49a505cf$0$3567$426a74cc@news.free.fr>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>
	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>
	<mailman.7178.1231918017.3487.python-list@python.org>
	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>
	<pan.2009.01.18.18.17.37.305157@virgilio.it>
	<mailman.7578.1232421082.3487.python-list@python.org>
	<pan.2009.01.20.04.03.05@REMOVE.THIS.cybersource.com.au>
	<87fxje4lqh.fsf@benfinney.id.au>
	<49a505cf$0$3567$426a74cc@news.free.fr>
Message-ID: <op.upxplz17a8ncjz@gnudebst>

On Wed, 25 Feb 2009 08:48:27 -0000, Bruno Desthuilliers  
<bruno.42.desthuilliers at websiteburo.invalid> wrote:

> Ben Finney a ?crit :
> (snip - about using ALL_CAPS for pseudo-constants)
>> Perhaps I'd even
>> argue for an update to PEP 8 that endorses this as conventional.
>
> +1
>
> I've been a bit surprised last time I checked PEP8 to find out this  
> wasn't already the case - I would have sweared it was.

It is.  Aahz added it a few weeks ago.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From gagsl-py2 at yahoo.com.ar  Wed Feb 25 20:18:00 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 25 Feb 2009 23:18:00 -0200
Subject: variables bound in moudules are None when module is not
	completely imported
References: <20090224142719.GA27379@hephaistos.amsuess.com>
	<20090225184816.GC28923@hephaistos.amsuess.com>
	<op.upw8nef3x6zn5v@gabriel.sleipnir-bsas>
	<20090225232433.GD28923@hephaistos.amsuess.com>
Message-ID: <op.upxpwausx6zn5v@gabriel.sleipnir-bsas>

En Wed, 25 Feb 2009 21:24:33 -0200, <chrysn at fsfe.org> escribi?:
> On Wed, Feb 25, 2009 at 05:05:28PM -0200, Gabriel Genellina wrote:

>> I'd try to move all the global stuff in that module into a function,
>> "init". Importing the module will always succeed - you have to manually
>> call init() after importing it.
>
> i normally do that anyway and would also have done so here (afaik, it's
> best practice anyway), but this is in this case not possible as the
> modules in question are not under my control at all. as pep 299 has been
> turned down, this can't really be considered a bug of those files.

You might ask the module author for this feature... At least, try to move  
the "registration" at the end, after any code likely to raise exceptions.

> anyway, it would just be another workaround around the globals
> disappearing.
>
>> That makes a strange situation where the module doesn't exist in
>> sys.modules but its globals are still alive...
>
> is this a known bug?

Not that I know.

> i mean from a garbage collection / refcount point
> of view, at least everything that is still referenced somewhere should
> be preserved.

In older Python versions, an error when importing a module could leave a  
module object in sys.module partially initialized. That's very bad! Now,  
the entry in sys.modules is removed in such cases. Note that functions and  
classes defined inside a module don't have a reference to the module  
itself - their __module__ attribute is a string (although functions *do*  
have a reference to the module namespace, as you have remarked). So the  
entry in sys.modules is likely to be the last and only reference, and when  
it's removed, the module is deleted. This is a very tricky operation and  
at some stage involves setting all globals to None; if not were for any  
external references (like a callback registered somewhere else, as in your  
case) the module plus the functions and classes and objects defined inside  
it plus its global namespace, all of these should disappear, kaput, gone.

You should report it at http://bugs.python.org -- I don't think this is  
likely to be "fixed" now, but at least it's on record. And when someone  
attempts to improve the module destruction sequence, there is a better  
chance this is taken into account too.

-- 
Gabriel Genellina



From zvezdan at zope.com  Wed Feb 25 20:44:50 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Wed, 25 Feb 2009 20:44:50 -0500
Subject: Python Image Library IOError - cannot find JPEG decoder?
In-Reply-To: <179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
References: <mailman.674.1235496906.11746.python-list@python.org>
	<179a3248-0179-401e-8887-0b61e5821219@c11g2000yqj.googlegroups.com>
Message-ID: <BD7D9967-60D2-481D-859C-07A983C0C2FE@zope.com>

> On Feb 24, 9:34 am, Dario Traverso <traver... at gmail.com> wrote:
>> I've been trying to install the Python Image Library  (PIL) on my Mac
>> OSX Leopard laptop, but have been running into some difficulties.
>> ...
>> I've followed all of the installation instructions exactly. The build
>> summary reported everything was "ok". What could be the problem here.
>> Libjpeg-6b  is not accessible?
>> That would be my guess.


It could be something obvious and something you have done, but it's  
worth asking:

1. Do you have the path to fink binaries, such as djpeg,
    in your shell PATH (e.g., /opt/local/bin for MacPorts)?

2. Did you set up the path to the libraries you linked with in the
    environment variable DYLD_LIBRARY_PATH?
    For example, DYLD_LIBRARY_PATH=/opt/local/lib for MacPorts

3. Did you execute your app with this variable available.

    $ env DYLD_LIBRARY_PATH=/opt/local/lib your-app

    Once you confirm what is missing you can write a Python wrapper
    to call your app with the right environment.



From zvezdan at zope.com  Wed Feb 25 21:11:13 2009
From: zvezdan at zope.com (Zvezdan Petkovic)
Date: Wed, 25 Feb 2009 21:11:13 -0500
Subject: "Battleship" style game
In-Reply-To: <2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
References: <mailman.750.1235579371.11746.python-list@python.org>
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<2dc0c81b0902250850w31b6add4u35cce3e8cae82e84@mail.gmail.com>
	<op.upw255p0x6zn5v@gabriel.sleipnir-bsas>
	<mailman.763.1235586832.11746.python-list@python.org>
	<70ln7dFcv6phU1@mid.uni-berlin.de>
	<2dc0c81b0902251254s431f903buc612c738ab3f4987@mail.gmail.com>
Message-ID: <BB0AC5F4-67F5-4ADE-9B2E-42EFD80913E7@zope.com>

On Feb 25, 2009, at 3:54 PM, Shawn Milochik wrote:
> It is true that it would be fewer lines of code with the same
> functionality, but it's better practice to have that framework in
> place so that any changes made in the future wouldn't break any of the
> code accessing my class. Obviously this is a fairly simple game that
> has a fixed set of rules, but I'm trying to cultivate good habits, and
> I don't think that doing it this way is anti-Pythonic.

Well, they are trying to help you with the best practices.
You offered the code for review and they reviewed it.
Whether you'll accept what they say or deny it is your call, of course.

FWIW, the Pythonic way would be:

 >>> class Ship(object):
...     def __init__(self, length):
...         self._length = length
...     @property
...     def length(self):
...         return self._length
...
 >>> s = Ship(5)
 >>> s.length
5
 >>> # notice how the property is read-only which is what you wanted
 >>> s.length = 7
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
 >>> ^D

Using @property decorator makes a read-only property.  If you need a  
read/write property there are several ways to define setter and  
deleter methods with or without decorators.

I hope you see that

	x = s.length
	s.position = y

is a completely different style than

	x = s.get_length()
	s.set_position(y)

Most of the people who program in Python prefer the first style above.



From newptcai at gmail.com  Wed Feb 25 21:14:40 2009
From: newptcai at gmail.com (=?GB2312?B?0rvK18qr?=)
Date: Wed, 25 Feb 2009 18:14:40 -0800 (PST)
Subject: Is this the right way to use unicode in a user defined Exception?
Message-ID: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>

#------------------------------------------------
class MyError(Exception):
    def __init__(self):
        self.message = u'Some Chinese:??'

    def __str__(self):
        return self.message.encode('utf8')
#------------------------------------------------

This is an exception that I defined.   I have to pass it to third
party libraries.

As many libraries simply use str(e) to log, if I don't encode it in
__str___, they will fail.

But I am not quite certain if it's the right thing to do.   Shouldn't
every library expect to use unicode everywhere?

Shouldn't they use something like :

log(unicode(e))


From david.birdsong at gmail.com  Wed Feb 25 21:39:30 2009
From: david.birdsong at gmail.com (birdsong)
Date: Wed, 25 Feb 2009 18:39:30 -0800 (PST)
Subject: thread safe to lock on key,val pairs on a dict instead of entire 
	dict?
Message-ID: <bc40b182-4f9f-4e5e-964c-16042f2179aa@o11g2000yql.googlegroups.com>

Dictionaries just store references to objects, right?  So is it thread
safe to lock a specific key/val pair on a dictionary and modify its
val and release the lock?

example snippet:
# assuming d_lock  was initialized long ago in a thread-safe manner
d_lock.acquire()
d = {}
d[1] = (threading.Lock(), [])
d_lock.release()

# test key level locking
for key, data in d.items():
  row_lock, rows = data
  row_lock.acquire()
  rows.append(1)
  row_lock.release()

Of course, I'll have to lock the entire dict when adding keys that
dont exist, but further calls and acquire the key specific lock before
doing any write operations.


From mmcclaf at gmail.com  Wed Feb 25 22:31:00 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Wed, 25 Feb 2009 19:31:00 -0800 (PST)
Subject: Using cPickle
References: <f33cbad4-d9a5-4f83-bc18-0ec34db74892@q30g2000prq.googlegroups.com>
	<mailman.8986.1233933973.3487.python-list@python.org>
	<4d5ead6c-4e8a-4003-86c6-519a638da1e1@y38g2000prg.googlegroups.com>
	<mailman.9003.1233950946.3487.python-list@python.org>
	<60dcd0f0-367f-4404-a9d2-62b96ddee389@i24g2000prf.googlegroups.com>
	<mailman.9011.1233957852.3487.python-list@python.org>
Message-ID: <1f34f542-8042-42a1-b2cf-95aa00256466@l39g2000yqn.googlegroups.com>

Thanks! All fixed!


From music24by7 at gmail.com  Wed Feb 25 22:37:38 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 19:37:38 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
Message-ID: <abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>

On Feb 26, 2:35?am, Emile van Sebille <em... at fenx.com> wrote:
> Peter Otten wrote:
> > Maybe it's about access rights?
>
> > $ mkdir alpha
> > $ touch alpha/beta
> > $ python -c"import os; print os.path.exists('alpha/beta')"
> > True
> > $ chmod u-x alpha
> > $ python -c"import os; print os.path.exists('alpha/beta')"
> > False
> > $
>
> > I Don't know how this is handled on Windows...
>
> Here's one way....
>
> Microsoft Windows XP [Version 5.1.2600]
> (C) Copyright 1985-2001 Microsoft Corp.
> C:\>mkdir alpha
> C:\>touch alpha\beta ?# cygwin at work here...
>
> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> True
>
> C:\>cacls alpha /E /R "Everyone"
> processed dir: C:\alpha
> C:\>cacls alpha /E /R "Users"
> processed dir: C:\alpha
> C:\>cacls alpha /E /R "Administrators"
> processed dir: C:\alpha
>
> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> False

Hi,

This is the following code which i have used to retrieve the pathname
of a filename given by the user

        filename = self.enText.get() # get the text entered in the
text box
        if os.path.exists(filename): # checking if the filename
exists , had replaced it with os.path.exists(os.path.abspath
(filename))
            print os.path.abspath(filename)
        else:
            print "Not found"

actually i need to list all the files/folders with the given filename
alongwith path and store it in an CSV file with index.

But i am unable to get even a single filepath correctly.
Whatever filename i enter the output is as : C:\Python25\WorkSpace
\xyz
i.e the name i entered is being appended to my workspace and
displayed.
Guys, i am not able to understand what shall i do here...plz help me
out.


Regards,
Sudhir


From steve at holdenweb.com  Wed Feb 25 23:03:09 2009
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 25 Feb 2009 23:03:09 -0500
Subject: File Path retrieving problem
In-Reply-To: <abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>	<go3ugf$ol7$03$1@news.t-online.com>
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
Message-ID: <go54ah$o41$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
>> Peter Otten wrote:
>>> Maybe it's about access rights?
>>> $ mkdir alpha
>>> $ touch alpha/beta
>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>> True
>>> $ chmod u-x alpha
>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>> False
>>> $
>>> I Don't know how this is handled on Windows...
>> Here's one way....
>>
>> Microsoft Windows XP [Version 5.1.2600]
>> (C) Copyright 1985-2001 Microsoft Corp.
>> C:\>mkdir alpha
>> C:\>touch alpha\beta  # cygwin at work here...
>>
>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>> True
>>
>> C:\>cacls alpha /E /R "Everyone"
>> processed dir: C:\alpha
>> C:\>cacls alpha /E /R "Users"
>> processed dir: C:\alpha
>> C:\>cacls alpha /E /R "Administrators"
>> processed dir: C:\alpha
>>
>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>> False
> 
> Hi,
> 
> This is the following code which i have used to retrieve the pathname
> of a filename given by the user
> 
>         filename = self.enText.get() # get the text entered in the
> text box
>         if os.path.exists(filename): # checking if the filename
> exists , had replaced it with os.path.exists(os.path.abspath
> (filename))
>             print os.path.abspath(filename)
>         else:
>             print "Not found"
> 
> actually i need to list all the files/folders with the given filename
> alongwith path and store it in an CSV file with index.
> 
> But i am unable to get even a single filepath correctly.
> Whatever filename i enter the output is as : C:\Python25\WorkSpace
> \xyz
> i.e the name i entered is being appended to my workspace and
> displayed.
> Guys, i am not able to understand what shall i do here...plz help me
> out.
> 
Look, we aren't psychic. We can't debug code and directories we can't
see. Work with us here - give us the information we need to help you.

The actual code. A directory listing? Any error messages?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From mmcclaf at gmail.com  Wed Feb 25 23:04:36 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Wed, 25 Feb 2009 20:04:36 -0800 (PST)
Subject: Queries
Message-ID: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>

I have to make  some queries for 4 tables I have. The following
relations are:

Classes(class, type, country, numGuns, bore, displacement)
Ships (name, class, launched)
Battles (name, date)
Outcomes (ship, battle, result)

The three queries I'm stuck on are the following:

1. Find the classes that have only one ship as a member of that class
(not all ships are listed in the Ship table)
2. Find the countries that had both battleships and battlecruisers
(those fall under type in Classes)
3. Find those ships that "lived to fight another day"; they were
damaged in one battle, but later fought in another.

The best way for me to understand would be relational algebra for each
of the statements.

Any help in this would be greatly appreciated.


From music24by7 at gmail.com  Wed Feb 25 23:16:39 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Wed, 25 Feb 2009 20:16:39 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
	<mailman.785.1235621020.11746.python-list@python.org>
Message-ID: <69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>

On Feb 26, 9:03?am, Steve Holden <st... at holdenweb.com> wrote:
> music24... at gmail.com wrote:
> > On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
> >> Peter Otten wrote:
> >>> Maybe it's about access rights?
> >>> $ mkdir alpha
> >>> $ touch alpha/beta
> >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> >>> True
> >>> $ chmod u-x alpha
> >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> >>> False
> >>> $
> >>> I Don't know how this is handled on Windows...
> >> Here's one way....
>
> >> Microsoft Windows XP [Version 5.1.2600]
> >> (C) Copyright 1985-2001 Microsoft Corp.
> >> C:\>mkdir alpha
> >> C:\>touch alpha\beta ?# cygwin at work here...
>
> >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> >> True
>
> >> C:\>cacls alpha /E /R "Everyone"
> >> processed dir: C:\alpha
> >> C:\>cacls alpha /E /R "Users"
> >> processed dir: C:\alpha
> >> C:\>cacls alpha /E /R "Administrators"
> >> processed dir: C:\alpha
>
> >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> >> False
>
> > Hi,
>
> > This is the following code which i have used to retrieve the pathname
> > of a filename given by the user
>
> > ? ? ? ? filename = self.enText.get() # get the text entered in the
> > text box
> > ? ? ? ? if os.path.exists(filename): # checking if the filename
> > exists , had replaced it with os.path.exists(os.path.abspath
> > (filename))
> > ? ? ? ? ? ? print os.path.abspath(filename)
> > ? ? ? ? else:
> > ? ? ? ? ? ? print "Not found"
>
> > actually i need to list all the files/folders with the given filename
> > alongwith path and store it in an CSV file with index.
>
> > But i am unable to get even a single filepath correctly.
> > Whatever filename i enter the output is as : C:\Python25\WorkSpace
> > \xyz
> > i.e the name i entered is being appended to my workspace and
> > displayed.
> > Guys, i am not able to understand what shall i do here...plz help me
> > out.
>
> Look, we aren't psychic. We can't debug code and directories we can't
> see. Work with us here - give us the information we need to help you.
>
> The actual code. A directory listing? Any error messages?
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/





Hi Steve,

Following is the code which i have written to display a GUI textbox
and get any name entered by the user and search the path of this
filename and then list it into an CSV file.

For this i initially created an textbox widget and added an button to
it.
Now, i have entered a filename (like NEWS.txt) in the text boz,
as you can see when i press the button i retrieve the text and then
search its filepath.
currently i am printing this filepath on the shell.


from Tkinter import *
import os
from os.path import realpath, exists, abspath
import tkMessageBox
import Tkinter
#import filePath

class GUIFrameWork(Frame):
    """This is the GUI"""

    def __init__(self,master=None):
        """Initialize yourself"""

        """Initialise the base class"""
        Frame.__init__(self,master)

        """Set the Window Title"""
        self.master.title("Enter Text to search")

        """Display the main window"
        with a little bit of padding"""
        self.grid(padx=10,pady=10)
        self.CreateWidgets()

    def CreateWidgets(self):

        self.enText = Entry(self)
        self.enText.grid(row=0, column=1, columnspan=3)



        """Create the Button, set the text and the
        command that will be called when the button is clicked"""
        self.btnDisplay = Button(self, text="Display!",
command=self.Display)
        self.btnDisplay.grid(row=0, column=4)

    def Display(self):
        """Called when btnDisplay is clicked, displays the contents of
self.enText"""
        filename = self.enText.get()
        if os.path.exists(os.path.abspath(filename)):
            print os.path.abspath(filename)
        else:
            print "Not found"
        #tkMessageBox.showinfo("Text", "You typed: %s" %
os.path.abspath(os.path.dirname(filename)))

        #filepath.mydir(self.enText.get())


if __name__ == "__main__":
    guiFrame = GUIFrameWork()
    guiFrame.mainloop()





User Input: NEWS.txt
Output: Not Found (though this file is actually present)




Regards,
Sudhir


From sjmachin at lexicon.net  Thu Feb 26 00:11:56 2009
From: sjmachin at lexicon.net (John Machin)
Date: Wed, 25 Feb 2009 21:11:56 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<mailman.746.1235577485.11746.python-list@python.org>
	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>
	<mailman.752.1235581197.11746.python-list@python.org>
	<go3ugf$ol7$03$1@news.t-online.com> 
	<mailman.772.1235597757.11746.python-list@python.org>
	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>
	<mailman.785.1235621020.11746.python-list@python.org>
	<69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
Message-ID: <c3b627e7-cd2b-4439-941f-b2814d4163d0@x13g2000yqf.googlegroups.com>

On Feb 26, 3:16?pm, music24... at gmail.com wrote:
> On Feb 26, 9:03?am, Steve Holden <st... at holdenweb.com> wrote:
>
>
>
> > music24... at gmail.com wrote:
> > > On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
> > >> Peter Otten wrote:
> > >>> Maybe it's about access rights?
> > >>> $ mkdir alpha
> > >>> $ touch alpha/beta
> > >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> > >>> True
> > >>> $ chmod u-x alpha
> > >>> $ python -c"import os; print os.path.exists('alpha/beta')"
> > >>> False
> > >>> $
> > >>> I Don't know how this is handled on Windows...
> > >> Here's one way....
>
> > >> Microsoft Windows XP [Version 5.1.2600]
> > >> (C) Copyright 1985-2001 Microsoft Corp.
> > >> C:\>mkdir alpha
> > >> C:\>touch alpha\beta ?# cygwin at work here...
>
> > >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> > >> True
>
> > >> C:\>cacls alpha /E /R "Everyone"
> > >> processed dir: C:\alpha
> > >> C:\>cacls alpha /E /R "Users"
> > >> processed dir: C:\alpha
> > >> C:\>cacls alpha /E /R "Administrators"
> > >> processed dir: C:\alpha
>
> > >> C:\>python -c"import os; print os.path.exists('alpha/beta')"
> > >> False
>
> > > Hi,
>
> > > This is the following code which i have used to retrieve the pathname
> > > of a filename given by the user
>
> > > ? ? ? ? filename = self.enText.get() # get the text entered in the
> > > text box
> > > ? ? ? ? if os.path.exists(filename): # checking if the filename
> > > exists , had replaced it with os.path.exists(os.path.abspath
> > > (filename))
> > > ? ? ? ? ? ? print os.path.abspath(filename)
> > > ? ? ? ? else:
> > > ? ? ? ? ? ? print "Not found"
>
> > > actually i need to list all the files/folders with the given filename
> > > alongwith path and store it in an CSV file with index.
>
> > > But i am unable to get even a single filepath correctly.
> > > Whatever filename i enter the output is as : C:\Python25\WorkSpace
> > > \xyz
> > > i.e the name i entered is being appended to my workspace and
> > > displayed.
> > > Guys, i am not able to understand what shall i do here...plz help me
> > > out.
>
> > Look, we aren't psychic. We can't debug code and directories we can't
> > see. Work with us here - give us the information we need to help you.
>
> > The actual code. A directory listing? Any error messages?
>
> > regards
> > ?Steve
> > --
> > Steve Holden ? ? ? ?+1 571 484 6266 ? +1 800 494 3119
> > Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/
>
> Hi Steve,
>
> Following is the code which i have written to display a GUI textbox
> and get any name entered by the user and search the path of this
> filename and then list it into an CSV file.
>
> For this i initially created an textbox widget and added an button to
> it.
> Now, i have entered a filename (like NEWS.txt) in the text boz,
> as you can see when i press the button i retrieve the text and then
> search its filepath.
> currently i am printing this filepath on the shell.
>
> from Tkinter import *
> import os
> from os.path import realpath, exists, abspath
> import tkMessageBox
> import Tkinter
> #import filePath
>
> class GUIFrameWork(Frame):
> ? ? """This is the GUI"""
>
> ? ? def __init__(self,master=None):
> ? ? ? ? """Initialize yourself"""
>
> ? ? ? ? """Initialise the base class"""
> ? ? ? ? Frame.__init__(self,master)
>
> ? ? ? ? """Set the Window Title"""
> ? ? ? ? self.master.title("Enter Text to search")
>
> ? ? ? ? """Display the main window"
> ? ? ? ? with a little bit of padding"""
> ? ? ? ? self.grid(padx=10,pady=10)
> ? ? ? ? self.CreateWidgets()
>
> ? ? def CreateWidgets(self):
>
> ? ? ? ? self.enText = Entry(self)
> ? ? ? ? self.enText.grid(row=0, column=1, columnspan=3)
>
> ? ? ? ? """Create the Button, set the text and the
> ? ? ? ? command that will be called when the button is clicked"""
> ? ? ? ? self.btnDisplay = Button(self, text="Display!",
> command=self.Display)
> ? ? ? ? self.btnDisplay.grid(row=0, column=4)
>
> ? ? def Display(self):
> ? ? ? ? """Called when btnDisplay is clicked, displays the contents of
> self.enText"""
> ? ? ? ? filename = self.enText.get()

Add some more code in here:
   print "filename", repr(filename)
   cwd = os.getcwd()
   print "cwd", cwd
   abspath = os.path.abspath(filename)
   print "abspath", repr(abspath)
   exists = os.path.exists(abspath)
   print "exists", exists
and copy/paste the output into your reply.
Also tell us the name of the folder that the file allegedly exists in,
with a folder listing to prove it.
Also show us the result of using the ATTRIB command on your file, like
in the following examples:

C:\junk>attrib c:\io.sys
   SHR     C:\IO.SYS

C:\junk>attrib c:\python26\python.exe
A          C:\python26\python.exe

Again, use copy/paste in your reply.


> ? ? ? ? if os.path.exists(os.path.abspath(filename)):
> ? ? ? ? ? ? print os.path.abspath(filename)
> ? ? ? ? else:
> ? ? ? ? ? ? print "Not found"
> ? ? ? ? #tkMessageBox.showinfo("Text", "You typed: %s" %
> os.path.abspath(os.path.dirname(filename)))
>
> ? ? ? ? #filepath.mydir(self.enText.get())
>
> if __name__ == "__main__":
> ? ? guiFrame = GUIFrameWork()
> ? ? guiFrame.mainloop()
>
> User Input: NEWS.txt
> Output: Not Found (though this file is actually present)



From hrishys at yahoo.co.uk  Thu Feb 26 00:36:04 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Thu, 26 Feb 2009 05:36:04 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>
Message-ID: <206436.56338.qm@web27404.mail.ukl.yahoo.com>

Ha the guru himself responding :-)


--- On Wed, 25/2/09, Paul McGuire <ptmcg at austin.rr.com> wrote:

> From: Paul McGuire <ptmcg at austin.rr.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 2:04 PM
> On Feb 25, 1:17?am, hrishy <hris... at yahoo.co.uk>
> wrote:
> > Hi
> >
> > Something like this
> >
> <snip solution using ElementTree>
> >
> > Note i am not a python programmer just a enthusiast
> and i was curious why people on the list didnt suggest a
> code like above
> >
> 
> You just beat the rest of us to it - good example of
> ElementTree for
> parsing XML (and I Iearned the '//' shortcut for
> one or more
> intervening tag levels).
> 
> To the OP: if you are parsing XML, I would look hard at the
> modules
> (esp. ElementTree) that are written explicitly for XML,
> before
> considering using regular expressions.  There are just too
> many
> potential surprises when trying to match XML tags -
> presence/absence/
> order of attributes, namespaces, whitespace inside tags, to
> name a
> few.
> 
> -- Paul
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From hrishys at yahoo.co.uk  Thu Feb 26 00:39:39 2009
From: hrishys at yahoo.co.uk (hrishy)
Date: Thu, 26 Feb 2009 05:39:39 +0000 (GMT)
Subject: XML Parsing
In-Reply-To: <1235565442.6046.2.camel@mctell>
Message-ID: <486443.55132.qm@web27405.mail.ukl.yahoo.com>

Hi Cliff

Thanks so using elementree is the right way to handle this problem

regards
Hrishy


--- On Wed, 25/2/09, J. Clifford Dyer <jcd at sdf.lonestar.org> wrote:

> From: J. Clifford Dyer <jcd at sdf.lonestar.org>
> Subject: Re: XML Parsing
> To: hrishys at yahoo.co.uk
> Cc: python-list at python.org, "Lie Ryan" <lie.1296 at gmail.com>
> Date: Wednesday, 25 February, 2009, 12:37 PM
> Probably because you responded an hour after the question
> was posted,
> and in the dead of night.  Newsgroups often move slower
> than that.  But
> now we have posted a solution like that, so all's well
> in the world.  :)
> 
> Cheers,
> Cliff
> 
> 
> On Wed, 2009-02-25 at 08:20 +0000, hrishy wrote:
> > Hi Lie
> > 
> > I am not a python guy but very interested in the
> langauge and i consider the people on this list to be
> intelligent and was wundering why you people did not suggest
> xpath for this kind of a problem just curious and willing to
> learn.
> > 
> > I am searching for a answer but the question is 
> > why not use xpath to extract xml text from a xml doc ?
> > 
> > regards
> > Hrishy
> > 
> > 
> > --- On Wed, 25/2/09, Lie Ryan
> <lie.1296 at gmail.com> wrote:
> > 
> > > From: Lie Ryan <lie.1296 at gmail.com>
> > > Subject: Re: XML Parsing
> > > To: python-list at python.org
> > > Date: Wednesday, 25 February, 2009, 7:33 AM
> > > Are you searching for answer or searching for
> another people
> > > that have 
> > > the same answer as you? :)
> > > 
> > > "Many roads lead to Rome" is a very
> famous
> > > quotation...
> > > 
> > > --
> > >
> http://mail.python.org/mailman/listinfo/python-list
> > 
> > 
> >       
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >


      


From gherron at islandtraining.com  Thu Feb 26 01:45:36 2009
From: gherron at islandtraining.com (Gary Herron)
Date: Wed, 25 Feb 2009 22:45:36 -0800
Subject: Queries
In-Reply-To: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
Message-ID: <49A63A90.4080003@islandtraining.com>

mmcclaf wrote:
> I have to make  some queries for 4 tables I have. The following
> relations are:
>
> Classes(class, type, country, numGuns, bore, displacement)
> Ships (name, class, launched)
> Battles (name, date)
> Outcomes (ship, battle, result)
>
> The three queries I'm stuck on are the following:
>
> 1. Find the classes that have only one ship as a member of that class
> (not all ships are listed in the Ship table)
> 2. Find the countries that had both battleships and battlecruisers
> (those fall under type in Classes)
> 3. Find those ships that "lived to fight another day"; they were
> damaged in one battle, but later fought in another.
>
> The best way for me to understand would be relational algebra for each
> of the statements.
>   


Sounds like a homework assignment.    Good luck with it.


> Any help in this would be greatly appreciated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   



From pythonnutter at gmail.com  Thu Feb 26 02:09:05 2009
From: pythonnutter at gmail.com (Python Nutter)
Date: Thu, 26 Feb 2009 18:09:05 +1100
Subject: PYTHONPATH on Mac 10.5
In-Reply-To: <C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>
References: <77e831100902251220k6ed40cdbseb039227eb3cde8@mail.gmail.com>
	<C571E9CD-8C78-4883-B43A-D1410676ED36@semanchuk.com>
Message-ID: <af90b3410902252309v52c62fb4x24249e43544e2208@mail.gmail.com>

+1 for site packages and standard shebang, still lets you launch with
python first followed by .py file or <big long path to a specific
python> followed by .py file

also for some clues, just open up a terminal in your Mac OS X computer
and check out your exports your PATH will be different depending on
all the software and development environments you may or may not be
using on your Mac, in particular:

declare -x PATH="/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin"

declare -x PYTHONSTARTUP="/Users/pythonnutter/.pythonstartup"

for the ultra curious, my custom python startup:

$cat .pythonstartup
# python startup file
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind('tab: complete')
# history file
histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass
atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter



On Windows you don't have much control in standard batch files but the
way I keep my Windows box (at work mind you, none at home)
multi-python'd

is I configure the environment for Framework 2.5.4, and all the path
environment variables are configured for the standard directory and
the scripts subdirectory.

in 25's scripts is go26.bat which just pre-pends the 2.6.1 path on the
head of PATH, and of course a go3.bat that pre-pends in 3.0.1

if you want to get fancy, since there is no pop in batch files that I
know of, you could drop a .py script in to read in PATH, pop off two
entries and modify the environment PATH so you fall back down the tree
(might need some list reversing in there to finish the massaging for
pops)

most times I get by with just exiting the terminal session in windows
and a new cmd session will once again take on the defaults for 2.5.4


From qq13234722 at gmail.com  Thu Feb 26 02:38:36 2009
From: qq13234722 at gmail.com (qq13234722 at gmail.com)
Date: Wed, 25 Feb 2009 23:38:36 -0800 (PST)
Subject: The Python's regex different from Perl's ,I want know what's the 
	different?
Message-ID: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>

The Python's regex different from Perl's ,I want know what's the
different?


From dan.barbus at gmail.com  Thu Feb 26 02:46:01 2009
From: dan.barbus at gmail.com (Dan Barbus)
Date: Wed, 25 Feb 2009 23:46:01 -0800 (PST)
Subject: class property not working in python 2.5.1
Message-ID: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>

Hi,

I have a problem with setting a property to a class instance, in
python 2.5.1. The property is defined through get and set methods, but
when I set it, the setter doesn't get called. Instead, I believe the
property in the instance gets replaced with a new object (string).

I have the following code (stripped down from my program):

class Model():
    def __init__(self, title = ''):
        self._views, self._title = [], None
        self.setTitle(title)

    def addView(self, view):
        self._views.append(view)
        view.onModelUpdated()

    def updateViews(self, trigger = None):
        for view in self._views:
            view.onModelUpdated(trigger)

    def getTitle(self):
        return self._title
    def setTitle(self, t):
        #if self.debug:
        if self._title != t:
            self._title = t
            self.updateViews()
    title = property(fget=getTitle, fset=setTitle)

# client code:

class CountUpdatesView():
    def __init__(self):
        self.updates = 0

    def onModelUpdated(self, trigger):
        self.updates += 1


m = Model('test')
v = CountUpdatesView()
m.addView(v)           # addView calls into v.onModelUpdated() and
                              # v.updates will be 1 after this
m.title = 'new title'    # Model.setTitle calls into v.onModelUpdated
()
                              # and v.updates should become 2
print m._title            # should print 'new title'; instead, prints
'test'

When assigning to m.title, v.updates is not changed, and the last line
prints the original value, passed to the constructor.
Am I missing something?

I noticed that if I put m.setTitle('new title') in the client code,
the code works correctly.


From lists at cheimes.de  Thu Feb 26 02:56:30 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 26 Feb 2009 08:56:30 +0100
Subject: class property not working in python 2.5.1
In-Reply-To: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
References: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
Message-ID: <go5hve$lc6$1@ger.gmane.org>

Dan Barbus schrieb:
> Hi,
> 
> I have a problem with setting a property to a class instance, in
> python 2.5.1. The property is defined through get and set methods, but
> when I set it, the setter doesn't get called. Instead, I believe the
> property in the instance gets replaced with a new object (string).
> 
> I have the following code (stripped down from my program):
> 
> class Model():
>     def __init__(self, title = ''):
>         self._views, self._title = [], None
>         self.setTitle(title)

*snip*

Properties don't work correctly on old style classes. You have to
subclass from object in order to get a new style class.

class Model(object):
    pass

Christian



From tjreedy at udel.edu  Thu Feb 26 03:12:02 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 03:12:02 -0500
Subject: Is this the right way to use unicode in a user defined Exception?
In-Reply-To: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>
References: <4fd105ea-8611-463c-a051-06130975cf20@r18g2000vbi.googlegroups.com>
Message-ID: <go5isd$mss$1@ger.gmane.org>

??? wrote:
> #------------------------------------------------
> class MyError(Exception):
>     def __init__(self):
>         self.message = u'Some Chinese:??'
> 
>     def __str__(self):
>         return self.message.encode('utf8')
> #------------------------------------------------
> 
> This is an exception that I defined.   I have to pass it to third
> party libraries.
> 
> As many libraries simply use str(e) to log, if I don't encode it in
> __str___, they will fail.
> 
> But I am not quite certain if it's the right thing to do.   Shouldn't
> every library expect to use unicode everywhere?
> 
> Shouldn't they use something like :
> 
> log(unicode(e))

In 3.0, text is unicode.  So libraries will mostly expect it.



From chelaskk at gmail.com  Thu Feb 26 04:05:06 2009
From: chelaskk at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 12:05:06 +0300
Subject: i have problem with glob.glob() in remotely directory
Message-ID: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>

hey i want to count number of files in remote computer

example of my code is

import glob
import os
import time
from datetime import date
today=date.today()
dir_count, file_count=0, 0

for files in glob.glob('\\192.168.0.45\files\*.txt'):
      file_count += len(files)
print '----the count of ',today, '-------'
print 'Found', dir_count, 'sub-directories in cwd'
print 'Found', file_count, 'files in cwd'
print 'Found', dir_count + file_count, 'files & sub-directories in cwd'
filename="reconciliation.txt"
file_string= str(file_count)+','+ str(today)+'\n'
File=open(filename,"a")
File.writelines( file_string)
File.close()



i get zero results since glob.glob( )can not traverse in \\192.168.0.45

can I get help please how can i do that???


From python at rcn.com  Thu Feb 26 04:12:24 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 01:12:24 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
Message-ID: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>

Here's a proposed implementation for Py2.7 and Py3.1:

    http://code.activestate.com/recipes/576669/

Would like you guys to kick the tires, exercise it a bit, and let me
know what you think.  The recipe runs under 2.6 and 3.0 without
modification so it should be easy to play with.

The main virtue of the proposed API is a near-zero learning curve.
The API is a same as for regular dictionaries but it remembers the
insertion order and used that for iteration, repr, etc.


Raymond



From clp2 at rebertia.com  Thu Feb 26 04:16:16 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 01:16:16 -0800
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
Message-ID: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>

On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
> hey i want to count number of files in remote computer
>
> example of my code is
>
> import glob
> import os
> import time
> from datetime import date
> today=date.today()
> dir_count, file_count=0, 0
>
> for files in glob.glob('\\192.168.0.45\files\*.txt'):

Remember that *backslash is the escape character* in Python, so you
need to double-up your backslashes in the string literal (or just use
forward slashes instead, Windows doesn't seem to care for Python in
most cases). Right now, the path really only starts with 1 backslash
and it has a formfeed character in it (\f), so it's obviously invalid;
thus, your problem.

So you want:
#looks ugly, doesn't it?
for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):

Or:
#will probably but not assuredly work
for files in glob.glob('//192.168.0.45/files/*.txt'):

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From music24by7 at gmail.com  Thu Feb 26 04:20:17 2009
From: music24by7 at gmail.com (music24by7 at gmail.com)
Date: Thu, 26 Feb 2009 01:20:17 -0800 (PST)
Subject: File Path retrieving problem
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
Message-ID: <f611da56-b923-4e1e-9460-3142b99b2175@v39g2000yqm.googlegroups.com>

Hi Dennis Thanks for your reply and also the detailed explanation.

>         Or do you mean you want something that, given a bare name, searches
> your file system to find where a file with that name actually is?
>

Yes, this is what i exactly needed.
I have found something interesting to do this using the os.walk(path)
function, and it worked....
I am pasting the code which i used for this:



testpath=r"C:\\"
logpath=r"C:\Pathfinder.txt"
csvpath=r"C:\Pathfinder.csv"
import os, csv

def logData(d={}, logfile="c://filename999.txt", separator="\n"):
    """Takes a dictionary of values and writes them to the provided
file path"""
    logstring=separator.join([str(key)+":  "+d[key] for key in
d.keys()])+"\n"
    f=open(logfile,'a')
    f.write(logstring)
    f.close()
    return
def walker(topPath,csvpath):
    fDict={}
    logDict={}
    limit=1000
    freed_space=0
    items=0
    fileHandle = csv.writer(open(csvpath, 'w'))
    fileHandle.writerow(['Index','Path'])
    for root, dirs, files in os.walk(topPath):
        for name in files:
            fpath=os.path.join(root,name)
            logDict["Name"]=name
            logDict["Path"]=fpath
            if name.find("NEWS"):
                continue
            else:
            logData(logDict, logpath, "\t")
            fDict[items] = name
            items=len(fDict.keys())
            fileHandle.writerow([items,fpath])
            print "Dict entry:  ",items,
            print "Path:  ",fpath
            if items > limit:
                break
        if items > limit:
                break
walker(testpath,csvpath)



Finally thank you all very much for the patience to listen to me.


Regards,
Sudhir



From dmitrey.kroshko at scipy.org  Thu Feb 26 04:39:48 2009
From: dmitrey.kroshko at scipy.org (dmitrey)
Date: Thu, 26 Feb 2009 01:39:48 -0800 (PST)
Subject: [numerical optimization] Poll "what do you miss in OpenOpt framework"
Message-ID: <1555c112-7c91-47a5-8104-315553f83b26@o11g2000yql.googlegroups.com>

Hi all,
I created a poll "what do you miss in OpenOpt framework", could you
take participation?

http://www.doodle.com/participation.html?pollId=a78g5mk9sf7dnrbe

Let me remember for those ones who is not familiar with OpenOpt - it's
a free Python-written numerical optimization framework:

http://openopt.org

I intend to take you opinions into account till next OpenOpt release
0.23 (2009-03-15)

Thank you in advance,
Dmitrey


From xahlee at gmail.com  Thu Feb 26 04:42:02 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 01:42:02 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com>
Message-ID: <002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com>

On Feb 26, 12:57 am, Miles Bader <mi... at gnu.org> wrote:
> There is ample room for people to discuss this evolution, but approaches
> that start with "first, toss out the existing user interface" aren't gonna fly.

Who said to toss out existing user interface, you?

Are you saying that i start my suggestion with ?throw out existing
UI?? If so, please point out where.

> Emacs isn't going to turn into a fancy notepad clone, regardless of what
> "modern" users may (think they) want...

In what way you imagine emacs is going to be a fancy Microsoft Notepad
clone?

I've wrote the following suggestions on emacs modernization in the
past 3 years:

? The Modernization of Emacs
  http://xahlee.org/emacs/modernization.html

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

? Emacs's M-?key? Notation vs Alt+?key? Notation
  http://xahlee.org/emacs/modernization_meta_key.html

? Emacs's Menu Usability Problem
  http://xahlee.org/emacs/modernization_menu.html

? Emacs's Mode Line Modernization Suggestions
  http://xahlee.org/emacs/modernization_mode_line.html

? Usability Problems With Emacs's Letter-Case Commands
  http://xahlee.org/emacs/modernization_upcase-word.html

? Suggestions on Emacs's mark-word Command
  http://xahlee.org/emacs/modernization_mark-word.html

? Suggestions on Emacs's Line-Cutting Commands
  http://xahlee.org/emacs/modernization_fill-paragraph.html

? Emacs Should Adopt HTML To Replace Texinfo
  http://xahlee.org/emacs/modernization_html_vs_info.html

? Emacs Should Support HTML Mail
  http://xahlee.org/emacs/modernization_html_mail.html

? Emacs's HTML Mode Sucks
  http://xahlee.org/emacs/emacs_html_sucks.html

which item, in which article, do you think that emacs is going to turn
into Notepad clone?

is the suggestion of using modern standard shortcut set of X C V for
Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
fancy Notepad clone?

Is fixing emacs's confusing undo and no redo, that is periodically
bitched by programer in blogs, considered making emacs into a Notepad
clone?

Is the suggestion for a statistics based ergonomic keybinding design
that are more faster to execute, easier on the fingers, and easier to
remember, mean it is turning emacs to a fancy notepad clone?

is the suggestion of getting rid of *scratch* buffer, and introduce a
command ?New? with shortcut Ctrl+n, that creates new buffer anytime
anywhere, which lets user create multiple scratch buffers defaulting
to any mode and compatible for the rest of Linux's shortcuts, means it
is a fancy Microsoft Notepad?

is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
+, such that it reflects the lable on the keyboard, and Richard
Stallman agrees may be a good idea, means it's Notepad?

is the suggestion of supporting html mail, and interface to gmail out
of the box, means it's becoming Microsoft Notepad?

is it simply the fact that making things easier to use, means kissing
Microsoft's ass?

Is the open source Firefox, and Google's extremely advanced
technologies and easy to use applications such as gmail, google map,
google earth, google code, all becoming Microsoft Notepad clone?

  Xah
? http://xahlee.org/

?



From python-url at phaseit.net  Thu Feb 26 04:58:34 2009
From: python-url at phaseit.net (Gabriel Genellina)
Date: Thu, 26 Feb 2009 09:58:34 +0000 (UTC)
Subject: Python-URL! - weekly Python news and links (Feb 26)
Message-ID: <go5p4a$hr9$1@lairds.us>

QOTW:  "I believe this is because Microsoft failed to understand the
original meaning of ___________________, and persisted with this
ghastly error in the name of backwards compatibility, justifying it
by suggesting that _________________________."  "Somebody should have
cards printed up..." - the comedy duo of Steve Holden and Grant Edwards
    http://groups.google.com/group/comp.lang.python/msg/5f44b59ba85c94c7
    
    
    Code challenge: generate all integers using only digits 1,2,3 and
    arithmetic operations
        http://groups.google.com/group/comp.lang.python/t/b387f99deb376392/
    
    How "pythonic" is to put code inside __init__.py?
        http://groups.google.com/group/comp.lang.python/t/ee5fe57066843c94/
    
    datetime.time treats midnight as False - is that sensible?
        http://groups.google.com/group/comp.lang.python/t/9e3914f85feb4ddc/
    
    SQLAlchemy got very much appreciation in this thread: "does a lot
    more than just an ORM, but can be used as a better DB-API too"
        http://groups.google.com/group/comp.lang.python/t/53ddd0045c89e315/
    
    FAQ: I create a big object and later destroy it. Why does memory
    usage not return to its initial value?
        http://groups.google.com/group/comp.lang.python/t/2c6ed3f94378b29c/
    
    How mmap (and numpy.memmap) works:
        http://groups.google.com/group/comp.lang.python/t/4fc4966065012dad/
    
    The right way to print 'bytes' in Python 3.0:
        http://groups.google.com/group/comp.lang.python/t/95033de64e9c35e8/
    
    How do arguments get passed to functions?
        http://groups.google.com/group/comp.lang.python/t/fb8c61eb265123db/
    
    
========================================================================
Everything Python-related you want is probably one or two clicks away in
these pages:

    Python.org's Python Language Website is the traditional
    center of Pythonia
        http://www.python.org
    Notice especially the master FAQ
        http://www.python.org/doc/FAQ.html

    PythonWare complements the digest you're reading with the
    marvelous daily python url
         http://www.pythonware.com/daily

    Just beginning with Python?  This page is a great place to start:
	http://wiki.python.org/moin/BeginnersGuide/Programmers

    The Python Papers aims to publish "the efforts of Python enthusiats":
	http://pythonpapers.org/
    The Python Magazine is a technical monthly devoted to Python:
	http://pythonmagazine.com

    Readers have recommended the "Planet" sites:
	http://planetpython.org
	http://planet.python.org

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.
        http://groups.google.com/group/comp.lang.python.announce/topics

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:
        http://www.awaretek.com/python/index.html

    The Python Package Index catalogues packages.
        http://www.python.org/pypi/

    The somewhat older Vaults of Parnassus ambitiously collects references
    to all sorts of Python resources.
        http://www.vex.net/~x/parnassus/

    Much of Python's real work takes place on Special-Interest Group
    mailing lists
        http://www.python.org/sigs/

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.
        http://www.pythonology.com/success

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
        http://www.python.org/psf/
    Among the ways you can support PSF is with a donation.
        http://www.python.org/psf/donations/

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions. 
        http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.python.devel&sort=date

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.
        http://www.cetus-links.org/oo_python.html

    Python FAQTS
        http://python.faqts.com/

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.
	http://code.activestate.com/recipes/langs/python/

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
        http://www.python.org/channews.rdf
    For more, see:
        http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation.
        http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse
	http://www.python.org/dev/peps/pep-0042/

    del.icio.us presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.
        http://del.icio.us/tag/python

    *Py: the Journal of the Python Language*
        http://www.pyzine.com

    Dr.Dobb's Portal is another source of Python news and articles:
        http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python
    and Python articles regularly appear at IBM DeveloperWorks:
        http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&searchScope=dW&encodedQuery=python&rankprofile=8

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.comp.python.general&sort=date
  http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.python&start=0&scoring=d&
  http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes

There is *not* an RSS for "Python-URL!"--at least not yet.  Arguments
for and against are occasionally entertained.


Suggestions/corrections for next week's posting are always welcome.
E-mail to <Python-URL at phaseit.net> should get through.

To receive a new issue of this posting in e-mail each Monday morning
(approximately), ask <claird at phaseit.net> to subscribe.  Mention
"Python-URL!".  Write to the same address to unsubscribe.


-- The Python-URL! Team--

Phaseit, Inc. (http://phaseit.net) is pleased to participate in and
sponsor the "Python-URL!" project.  Watch this space for upcoming
news about posting archives.


From tassilo at member.fsf.org  Thu Feb 26 04:59:49 2009
From: tassilo at member.fsf.org (Tassilo Horn)
Date: Thu, 26 Feb 2009 10:59:49 +0100
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org>
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com>
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com>
Message-ID: <87k57dwmay.fsf@thinkpad.tsdh.de>

Xah Lee <xahlee at gmail.com> writes:

Hi Xah,

> is the suggestion of using modern standard shortcut set of X C V for
> Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> fancy Notepad clone?

The functionality stays the same, but IMO it would confuse most users.
Killing is not cutting, yanking is not pasting.  The whole concepts
(kill-ring vs. simple copy&paste) are much different.

> Is fixing emacs's confusing undo and no redo, that is periodically
> bitched by programer in blogs, considered making emacs into a Notepad
> clone?

It's much more advanced than the usual sequential undo, but I admit that
it can get confusing sometimes.  So instead of dropping it I'd prefer to
think about a better UI for it.

> Is the suggestion for a statistics based ergonomic keybinding design
> that are more faster to execute, easier on the fingers, and easier to
> remember, mean it is turning emacs to a fancy notepad clone?

Users use different commands and your bindings may be better for you on
your querty keyboard, but I'm sure they're not on my German Dvorak Type
II keyboard.

> is the suggestion of getting rid of *scratch* buffer, and introduce a
> command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> anywhere, which lets user create multiple scratch buffers defaulting
> to any mode and compatible for the rest of Linux's shortcuts, means it
> is a fancy Microsoft Notepad?

Such a easy key like C-n is much too valuable for such a rarely used
command.  C-x b foobar RET is ok, isn't it?

> is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> +, such that it reflects the lable on the keyboard, and Richard
> Stallman agrees may be a good idea, means it's Notepad?

Nope, but I'm not sure if it's possible for emacs to get the right key.
Here, M is Alt, but Ctrl is indeed on the CapsLock key...

And it makes key sequences much longer to write with little or no
benefit.

> is the suggestion of supporting html mail, and interface to gmail out
> of the box, means it's becoming Microsoft Notepad?

Definitively not.  AFAIK Gnus can handle gmail accounts quite well.
Reading HTML mail works nice, too (with emacs-w3m as helper).  A simple
editor would be nice for some people, too.  But I guess that most
current devs arent interested in writing one, cause in "the tech
geekers" world mail is in text/plain.

Bye,
Tassilo


From mmcclaf at gmail.com  Thu Feb 26 05:02:23 2009
From: mmcclaf at gmail.com (Murray)
Date: Thu, 26 Feb 2009 05:02:23 -0500
Subject: Queries
In-Reply-To: <49A63A90.4080003@islandtraining.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
Message-ID: <B1EE9CB351104851B082ADD40129E3D3@user>

It is, however I was able to get the first 8 done, I am struggling with
these 3 particular ones. I have to make an SQL file based off of it, so this
seems to be a blockage in my works.

-----Original Message-----
From: Gary Herron [mailto:gherron at islandtraining.com] 
Sent: Thursday, February 26, 2009 1:46 AM
To: mmcclaf; python-list at python.org
Subject: Re: Queries

mmcclaf wrote:
> I have to make  some queries for 4 tables I have. The following
> relations are:
>
> Classes(class, type, country, numGuns, bore, displacement)
> Ships (name, class, launched)
> Battles (name, date)
> Outcomes (ship, battle, result)
>
> The three queries I'm stuck on are the following:
>
> 1. Find the classes that have only one ship as a member of that class
> (not all ships are listed in the Ship table)
> 2. Find the countries that had both battleships and battlecruisers
> (those fall under type in Classes)
> 3. Find those ships that "lived to fight another day"; they were
> damaged in one battle, but later fought in another.
>
> The best way for me to understand would be relational algebra for each
> of the statements.
>   


Sounds like a homework assignment.    Good luck with it.


> Any help in this would be greatly appreciated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

No virus found in this incoming message.
Checked by AVG - www.avg.com 
Version: 8.0.237 / Virus Database: 270.11.3/1971 - Release Date: 02/25/09
06:40:00



From jrod at blacknode.net  Thu Feb 26 05:05:40 2009
From: jrod at blacknode.net (Jrod)
Date: Thu, 26 Feb 2009 04:05:40 -0600
Subject: Building python extensions
Message-ID: <49A66974.8020501@blacknode.net>

Lets say I compile python 2.6.1 without readline support due to not 
having the readline headers installed prior. Is there a standard way to 
recompile the extension without having to rebuild the entire source. 
Looking at the makefile, I found the gcc line (modified to dump the 
relocatable in the source root ):

$ gcc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes -I. -I/py/site/Python-2.6.1/./Include -I. -IInclude 
-I./Include -I/usr/local/include -I/py/site/Python-2.6.1/Include 
-I/py/site/Python-2.6.1 -c /py/site/Python-2.6.1/Modules/readline.c -o 
build/temp.linux-x86_64-2.6/py/site/Python-2.6.1/Modules/readline.o -o 
readline.so

This works (cp -av readline.so /py/2.6.1/lib/python2.6/lib-dynload/), 
but is less than ideal. Maybe I am missing something in the docs? In php 
there is phpize, is there something like this for python?

'python setup.py build' builds all the extensions in Modules/

This is my first time posting here and I am pretty new to python, so 
pardon me if my my logic is a bit off. I love reading, so feel free to 
link to the relevant documentation :)

Jrod


From visco31 at gmail.com  Thu Feb 26 05:41:51 2009
From: visco31 at gmail.com (Visco Shaun)
Date: Thu, 26 Feb 2009 16:11:51 +0530
Subject: subprocess module: execution of standard binaries without shell?
Message-ID: <1235644911.8600.9.camel@ajc.k7>

hi all

while getting used to with subprocess module i failed in executuing a)
but succeeded in running b). Can anyone explain me why as i am providing
absolute path? Is this has to do anything with shared library.. which
must be accessed based on system variables?


a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True)
		==>OSError: [Errno 2] No such file or directory

b) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
close_fds=True, shell=True)

-- 
Thanks & Regards
visco



From lists at cheimes.de  Thu Feb 26 05:46:08 2009
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 26 Feb 2009 11:46:08 +0100
Subject: subprocess module: execution of standard binaries without shell?
In-Reply-To: <1235644911.8600.9.camel@ajc.k7>
References: <1235644911.8600.9.camel@ajc.k7>
Message-ID: <go5rtg$mst$1@ger.gmane.org>

Visco Shaun schrieb:
> hi all
> 
> while getting used to with subprocess module i failed in executuing a)
> but succeeded in running b). Can anyone explain me why as i am providing
> absolute path? Is this has to do anything with shared library.. which
> must be accessed based on system variables?
> 
> 
> a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True)
> 		==>OSError: [Errno 2] No such file or directory

You have to use a list instead of a string here.

pipe = subprocess.Popen(["/bin/ls", "/"], stdout=subprocess.PIPE)



From jkv at unixcluster.dk  Thu Feb 26 05:46:24 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 11:46:24 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
Message-ID: <49A67300.6050303@unixcluster.dk>

Hi,

Are there any way to change the EOL character for sys.stdin.readline() 
and raw_input()?
My problem is that i cannot rely on that the clients connection to my 
application will end all lines with \n or \r\n. Sometimes they will use 
\r\000 as EOL.

Example from my code:

    sys.stdout.write('Password: ');
    #IAC DO ECHO  
    sys.stdout.write('\xFF\xFB\x01')
    password = raw_input()

If the client sends 'qwerty\r\n' everything is fine and the password get 
stored in the variable. But sometimes, depending on how broken the 
telnet client are, the client will send 'qwerty\r\000' instead and then 
my application will hang at 'password = raw_input()' forever.

Any suggestions?

Regards,
jkv




From clp2 at rebertia.com  Thu Feb 26 05:56:53 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 02:56:53 -0800
Subject: subprocess module: execution of standard binaries without shell?
In-Reply-To: <1235644911.8600.9.camel@ajc.k7>
References: <1235644911.8600.9.camel@ajc.k7>
Message-ID: <50697b2c0902260256x48051d6es44c2800ec1b89466@mail.gmail.com>

On Thu, Feb 26, 2009 at 2:41 AM, Visco Shaun <visco31 at gmail.com> wrote:
> hi all
>
> while getting used to with subprocess module i failed in executuing a)
> but succeeded in running b). Can anyone explain me why as i am providing
> absolute path? Is this has to do anything with shared library.. which
> must be accessed based on system variables?
>
>
> a) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True)
> ? ? ? ? ? ? ? ?==>OSError: [Errno 2] No such file or directory

You need to use a list of arguments, not just a string. You're
currently telling Python to try and run a nonexistent directory
(specifically, the "ls " subdirectory of /bin), since the string way
of calling Popen assumes that the *entire* string is the path to the
executable when shell=False.

The correct way is to provide the path to the binary and then each of
its arguments, in a list:
pipe = subprocess.Popen(["/bin/ls", "/"], stdout=subprocess.PIPE,
close_fds=True)

> b) pipe = subprocess.Popen("/bin/ls /", stdout=subprocess.PIPE,
> close_fds=True, shell=True)

This works because shell=True sends the string through the shell,
which tokenizes it and runs it, effectively splitting the string into
a list for you. However, shell=True is dangerous as you need to be
careful to escape special characters, whereas that's not necessary for
the 'shell=False and list' way of calling Popen.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From jineu21 at hotmail.com  Thu Feb 26 06:05:25 2009
From: jineu21 at hotmail.com (Clarendon)
Date: Thu, 26 Feb 2009 03:05:25 -0800 (PST)
Subject: Delete all items in the list
Message-ID: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>

Hi. This must be a simple command but I just can't find it in the
Phthon manual. How do I delete all items with a certain condition from
a list? For instance:

L=['a', 'b', 'c', 'a']

I want to delete all 'a's from the list.
But if L.remove('a') only deletes the first 'a'.

How do you delete all 'a's?
I would really appreciate your help.

Thanks.



From bjornjobb at gmail.com  Thu Feb 26 06:07:21 2009
From: bjornjobb at gmail.com (Bjorn)
Date: Thu, 26 Feb 2009 03:07:21 -0800 (PST)
Subject: sending gmail with smtplib from behind a proxy
Message-ID: <e0b65df2-b9dc-44a1-b990-28d9d622cfaf@w35g2000yqm.googlegroups.com>

Hi, I tried the script below to send mail by gmail from python using
smptlib. I got the script here (http://kutuma.blogspot.com/2007/08/
sending-emails-via-gmail-with-python.html)

It works fine from home, but at work not. I think it is because I am
behind a http or a socks proxy server at work. Can I adapt this script
to work from behind the http or socks proxy? I couldnt understand from
the smtplib if I can specify this somehow?

Sincerely,
bjorn johansson

----Script---------
#!/usr/bin/python

import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email import Encoders
import os

gmail_user = "your_email at gmail.com"
gmail_pwd = "your_password"

def mail(to, subject, text, attach):
   msg = MIMEMultipart()

   msg['From'] = gmail_user
   msg['To'] = to
   msg['Subject'] = subject

   msg.attach(MIMEText(text))

   part = MIMEBase('application', 'octet-stream')
   part.set_payload(open(attach, 'rb').read())
   Encoders.encode_base64(part)
   part.add_header('Content-Disposition',
           'attachment; filename="%s"' % os.path.basename(attach))
   msg.attach(part)

   mailServer = smtplib.SMTP("smtp.gmail.com", 587)
   mailServer.ehlo()
   mailServer.starttls()
   mailServer.ehlo()
   mailServer.login(gmail_user, gmail_pwd)
   mailServer.sendmail(gmail_user, to, msg.as_string())
   # Should be mailServer.quit(), but that crashes...
   mailServer.close()

mail("some.person at some.address.com",
   "Hello from python!",
   "This is a email sent with python",
   "my_picture.jpg")


From clp2 at rebertia.com  Thu Feb 26 06:15:49 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 03:15:49 -0800
Subject: Delete all items in the list
In-Reply-To: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>

On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
>
> L=['a', 'b', 'c', 'a']
>
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
>
> How do you delete all 'a's?

There are several ways. I'd go with a list comprehension:

L = [i for i in L if i != 'a']

Or to modify the list in-place:

L[:] = [i for i in L if i != 'a']

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From python.list at tim.thechases.com  Thu Feb 26 06:22:27 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 26 Feb 2009 05:22:27 -0600
Subject: The Python's regex different from Perl's ,I want know what's
	the 	different?
In-Reply-To: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
References: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
Message-ID: <49A67B73.4090408@tim.thechases.com>

> The Python's regex different from Perl's ,I want know what's the
> different?

Easy:

   bash$ diff <(lynx -dump http://perldoc.perl.org/perlre.html) 
<(lynx -dump http://docs.python.org/library/re.html)


Had you tried the great Google in the sky, you might have found 
such pages as:

http://mail.python.org/pipermail/python-list/2005-April/319030.html

or even a popular book on the subject:

http://oreilly.com/catalog/9780596002893/



-tkc







From chelaskk at gmail.com  Thu Feb 26 06:28:35 2009
From: chelaskk at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 14:28:35 +0300
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
	<50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
Message-ID: <967cd34f0902260328x55d313fdpf55f8a69166f6a76@mail.gmail.com>

i did try but still not working.But also i try  os.walk() for remote
computer like  os.walk('\\192.168.0.45') it also failed>
Thats it is my main problem do i need any new imports besides import os

On 2/26/09, Chris Rebert <clp2 at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
>  > hey i want to count number of files in remote computer
>  >
>  > example of my code is
>  >
>  > import glob
>  > import os
>  > import time
>  > from datetime import date
>  > today=date.today()
>  > dir_count, file_count=0, 0
>  >
>  > for files in glob.glob('\\192.168.0.45\files\*.txt'):
>
>
> Remember that *backslash is the escape character* in Python, so you
>  need to double-up your backslashes in the string literal (or just use
>  forward slashes instead, Windows doesn't seem to care for Python in
>  most cases). Right now, the path really only starts with 1 backslash
>  and it has a formfeed character in it (\f), so it's obviously invalid;
>  thus, your problem.
>
>  So you want:
>  #looks ugly, doesn't it?
>
> for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):
>
>
> Or:
>  #will probably but not assuredly work
>
> for files in glob.glob('//192.168.0.45/files/*.txt'):
>
>
> Cheers,
>  Chris
>
>
>  --
>  Follow the path of the Iguana...
>  http://rebertia.com
>


From jerry at hotmail.com  Thu Feb 26 06:50:22 2009
From: jerry at hotmail.com (sert)
Date: Thu, 26 Feb 2009 11:50:22 +0000 (UTC)
Subject: Efficient searching through objects
Message-ID: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>

I have written a program that reads data and updates the records 
for some people. They are represented by objects, and I need to 
read the data from a file, look the person up and then update 
his record.

I have implemented this by creating a list with all the people's 
names and another list with their objects (their data).

It works but after profiling the code it turns out that half the 
time spent in the program is spent in the list.index() function 
looking up names. Isn't there a less goofy and more efficient 
way of doing this?


From dangoor at gmail.com  Thu Feb 26 07:19:52 2009
From: dangoor at gmail.com (Kevin Dangoor (Mozilla))
Date: Thu, 26 Feb 2009 04:19:52 -0800 (PST)
Subject: Is there something easier than ORM?
References: <07cb23ac-3f67-45f2-a1ba-9fb80510db9b@z28g2000prd.googlegroups.com>
	<8C9A6CB8-80A6-4E10-8EA1-3C40EAED058D@semanchuk.com>
	<49f712d8783aa02d9f76692f11e1b1b9.squirrel@localhost> 
	<mailman.134.1234890640.11746.python-list@python.org>
	<26c3659d-ce14-4375-9da7-d9fefc4748ac@a39g2000prl.googlegroups.com>
Message-ID: <8621b9e6-0f12-4d1d-835d-7af878217c42@13g2000yql.googlegroups.com>

On Feb 17, 10:28?pm, alex23 <wuwe... at gmail.com> wrote:
> On Feb 18, 3:10?am, Robert Kern <robert.k... at gmail.com> wrote:
>
> > Its public image definitely suffers from the impression that it's "an ORM" that
> > can be compared on equal terms with packages that actually are just ORMs. I
> > describe it as a very powerful toolkit for solving a wide variety of problems
> > involving SQL databases. One of those tools happens to be an ORM.
>
> I'm going to have to steal that description the next time I try to
> sell a co-worker on the value of SQLAlchemy. There's always a strong
> reaction against the mention of ORMs, generally along the lines of it
> moving the programmer too far away from the real action. But my
> experience is identical to both andrew's and your's; there is far far
> more of value in SQLA than the ORM alone.

I just saw this thread via the weekly Python URL email and wanted to
add one bit here. When I've been selling people on using SQLAlchemy,
one argument that I make is that if you're using a relational database
for storage but your program is using objects (and good Python
programs do!), then you're doing ORM. If you're not using SQLAlchemy
(or similar), you're likely doing ORM badly.

SQLAlchemy's SQL layer definitely makes it a different beast from most
ORMs.

Kevin


From rdmurray at bitdance.com  Thu Feb 26 07:20:16 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Thu, 26 Feb 2009 12:20:16 +0000 (UTC)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
Message-ID: <go61e0$9jd$1@ger.gmane.org>

sert <jerry at hotmail.com> wrote:
> I have written a program that reads data and updates the records 
> for some people. They are represented by objects, and I need to 
> read the data from a file, look the person up and then update 
> his record.
> 
> I have implemented this by creating a list with all the people's 
> names and another list with their objects (their data).
> 
> It works but after profiling the code it turns out that half the 
> time spent in the program is spent in the list.index() function 
> looking up names. Isn't there a less goofy and more efficient 
> way of doing this?

It sounds like what you are looking for is the dictionary
data type.

--RDM



From bearophileHUGS at lycos.com  Thu Feb 26 07:21:17 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 26 Feb 2009 04:21:17 -0800 (PST)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
Message-ID: <37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>

sert:
> I have implemented this by creating a list with all the people's
> names and another list with their objects (their data).
>
> It works but after profiling the code it turns out that half the
> time spent in the program is spent in the list.index() function
> looking up names. Isn't there a less goofy and more efficient
> way of doing this?

Try using a dict instead, where keys are the names and objects the
values (it turns a linear search in a quick hash look up). . Then tell
us the performance changes.

Bye,
bearophile


From lkassana at gmail.com  Thu Feb 26 07:38:01 2009
From: lkassana at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 15:38:01 +0300
Subject: problem with glob in remote directory or os.walk in remote directory 
	in windos
Message-ID: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>

i am trying to write script which will count files for remote directory
which having certain pattern.

i tried with my code and have a look at this code.
-----------------------------------------------------------------------------------

import glob
import os
import time
from datetime import date
today=date.today()
dir_count, file_count=0, 0

for files in glob.glob('*\\192.168.0.45\files\*.txt'*):
     file_count += len(files)
print '----the count of ',today, '-------'
print 'Found', dir_count, 'sub-directories in cwd'
print 'Found', file_count, 'files in cwd'
print 'Found', dir_count + file_count, 'files & sub-directories in cwd'
filename="reconciliation.txt"
file_string= str(file_count)+','+ str(today)+'\n'
File=open(filename,"a")
File.writelines( file_string)
File.close()
--------------------------------------------------------------------------------------------------------
the problem the glob.glob() does not work in remotely directory especially
in window environment i don't know why??

i also try os.walk() for remote directory it failed i am wondering why . Do
i have to import a new module in import besides import  glob,os
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From jerry at hotmail.com  Thu Feb 26 07:42:46 2009
From: jerry at hotmail.com (sert)
Date: Thu, 26 Feb 2009 12:42:46 +0000 (UTC)
Subject: Efficient searching through objects
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>
Message-ID: <Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>

bearophileHUGS at lycos.com wrote in
news:37632421-5475-4859-be83-07ae2eca1773 at r4g2000yqa.googlegro
ups.com: 

> Try using a dict instead, where keys are the names and
> objects the values (it turns a linear search in a quick
> hash look up). . Then tell us the performance changes.
> 

It halved the overall execution time. Thanks.


From steve at holdenweb.com  Thu Feb 26 07:44:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:44:36 -0500
Subject: File Path retrieving problem
In-Reply-To: <69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>	<mailman.746.1235577485.11746.python-list@python.org>	<9e0c2728-f28a-4b3a-8199-17e92da217fd@l38g2000vba.googlegroups.com>	<mailman.752.1235581197.11746.python-list@python.org>	<go3ugf$ol7$03$1@news.t-online.com>
	<mailman.772.1235597757.11746.python-list@python.org>	<abbfa890-74af-4e4d-8841-e16618e67000@v38g2000yqb.googlegroups.com>	<mailman.785.1235621020.11746.python-list@python.org>
	<69c346c0-33e2-48d9-95c9-22a11c0d47ad@p11g2000yqe.googlegroups.com>
Message-ID: <go62sg$eoc$1@ger.gmane.org>

music24by7 at gmail.com wrote:
> On Feb 26, 9:03 am, Steve Holden <st... at holdenweb.com> wrote:
>> music24... at gmail.com wrote:
>>> On Feb 26, 2:35 am, Emile van Sebille <em... at fenx.com> wrote:
>>>> Peter Otten wrote:
>>>>> Maybe it's about access rights?
>>>>> $ mkdir alpha
>>>>> $ touch alpha/beta
>>>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>>>> True
>>>>> $ chmod u-x alpha
>>>>> $ python -c"import os; print os.path.exists('alpha/beta')"
>>>>> False
>>>>> $
>>>>> I Don't know how this is handled on Windows...
>>>> Here's one way....
>>>> Microsoft Windows XP [Version 5.1.2600]
>>>> (C) Copyright 1985-2001 Microsoft Corp.
>>>> C:\>mkdir alpha
>>>> C:\>touch alpha\beta  # cygwin at work here...
>>>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>>>> True
>>>> C:\>cacls alpha /E /R "Everyone"
>>>> processed dir: C:\alpha
>>>> C:\>cacls alpha /E /R "Users"
>>>> processed dir: C:\alpha
>>>> C:\>cacls alpha /E /R "Administrators"
>>>> processed dir: C:\alpha
>>>> C:\>python -c"import os; print os.path.exists('alpha/beta')"
>>>> False
>>> Hi,
>>> This is the following code which i have used to retrieve the pathname
>>> of a filename given by the user
>>>         filename = self.enText.get() # get the text entered in the
>>> text box
>>>         if os.path.exists(filename): # checking if the filename
>>> exists , had replaced it with os.path.exists(os.path.abspath
>>> (filename))
>>>             print os.path.abspath(filename)
>>>         else:
>>>             print "Not found"
>>> actually i need to list all the files/folders with the given filename
>>> alongwith path and store it in an CSV file with index.
>>> But i am unable to get even a single filepath correctly.
>>> Whatever filename i enter the output is as : C:\Python25\WorkSpace
>>> \xyz
>>> i.e the name i entered is being appended to my workspace and
>>> displayed.
>>> Guys, i am not able to understand what shall i do here...plz help me
>>> out.
>> Look, we aren't psychic. We can't debug code and directories we can't
>> see. Work with us here - give us the information we need to help you.
>>
>> The actual code. A directory listing? Any error messages?
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/
> 
> 
> 
> 
> 
> Hi Steve,
> 
> Following is the code which i have written to display a GUI textbox
> and get any name entered by the user and search the path of this
> filename and then list it into an CSV file.
> 
> For this i initially created an textbox widget and added an button to
> it.
> Now, i have entered a filename (like NEWS.txt) in the text boz,
> as you can see when i press the button i retrieve the text and then
> search its filepath.
> currently i am printing this filepath on the shell.
> 
> 
> from Tkinter import *

So this is Python 2.x ...

> import os
> from os.path import realpath, exists, abspath
> import tkMessageBox
> import Tkinter

Not sure why you bother to import Tkinter when you have above just
imported everything *from* Tkinter ...

> #import filePath
> 
> class GUIFrameWork(Frame):
>     """This is the GUI"""
> 
>     def __init__(self,master=None):
>         """Initialize yourself"""
> 
>         """Initialise the base class"""
>         Frame.__init__(self,master)
> 
>         """Set the Window Title"""
>         self.master.title("Enter Text to search")
> 
>         """Display the main window"
>         with a little bit of padding"""
>         self.grid(padx=10,pady=10)
>         self.CreateWidgets()
> 
>     def CreateWidgets(self):
> 
>         self.enText = Entry(self)
>         self.enText.grid(row=0, column=1, columnspan=3)
> 
> 
> 
>         """Create the Button, set the text and the
>         command that will be called when the button is clicked"""
>         self.btnDisplay = Button(self, text="Display!",
> command=self.Display)
>         self.btnDisplay.grid(row=0, column=4)
> 
>     def Display(self):
>         """Called when btnDisplay is clicked, displays the contents of
> self.enText"""
>         filename = self.enText.get()
>         if os.path.exists(os.path.abspath(filename)):
>             print os.path.abspath(filename)

First, move this line up one (losing an indent level) so you always
print the full path. This will verify you are looking where you think
you are looking.

>         else:
>             print "Not found"
>         #tkMessageBox.showinfo("Text", "You typed: %s" %
> os.path.abspath(os.path.dirname(filename)))
> 
>         #filepath.mydir(self.enText.get())
> 
> 
> if __name__ == "__main__":
>     guiFrame = GUIFrameWork()
>     guiFrame.mainloop()
> 
> 
> User Input: NEWS.txt
> Output: Not Found (though this file is actually present)
> 
Thanks for the information. I'm wondering whether there might be some
filename encoding issue here, but others may have some better ideas.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 26 07:47:03 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:47:03 -0500
Subject: File Path retrieving problem
In-Reply-To: <McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
References: <86a29476-fde2-4983-af62-4eb8a68425a8@w34g2000yqm.googlegroups.com>
	<McidnUVzsIoVvjvUnZ2dnUVZ_vKdnZ2d@earthlink.com>
Message-ID: <go6312$eoc$2@ger.gmane.org>

Dennis Lee Bieber wrote:
> On Wed, 25 Feb 2009 07:37:21 -0800 (PST), music24by7 at gmail.com declaimed
> the following in comp.lang.python:
> 
> 	WARNING -- I will probably NOT see your response; since 90+% of the
> spam in comp.lang.python is injected via googlegroups and gmail
> accounts, my client is configured to filter out messages with a from
> address having gmail.com. I only found this message by doing fetches on
> the reference header of the replies that did get by the filter.
> 
Well, since it's more likely you'll see this, let me tell you that if
you access the group via gmane (as I do) you rarely see the spam anyway.
There's been a lot more work on spam filtering lately.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From bruno.42.desthuilliers at websiteburo.invalid  Thu Feb 26 07:48:15 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 26 Feb 2009 13:48:15 +0100
Subject: Delete all items in the list
In-Reply-To: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <49a68f7b$0$2669$426a74cc@news.free.fr>

Clarendon a ?crit :
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
> 
> L=['a', 'b', 'c', 'a']
> 
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
> 
> How do you delete all 'a's?

L[:] = [item for item in L if item != 'a']



From steve at holdenweb.com  Thu Feb 26 07:51:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:51:50 -0500
Subject: Queries
In-Reply-To: <B1EE9CB351104851B082ADD40129E3D3@user>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user>
Message-ID: <go63a1$g44$1@ger.gmane.org>

Murray wrote:
[top-posting corrected]

> -----Original Message-----
> From: Gary Herron [mailto:gherron at islandtraining.com] 
> Sent: Thursday, February 26, 2009 1:46 AM
> To: mmcclaf; python-list at python.org
> Subject: Re: Queries
> 
> mmcclaf wrote:
>> I have to make  some queries for 4 tables I have. The following
>> relations are:
>>
>> Classes(class, type, country, numGuns, bore, displacement)
>> Ships (name, class, launched)
>> Battles (name, date)
>> Outcomes (ship, battle, result)
>>
>> The three queries I'm stuck on are the following:
>>
>> 1. Find the classes that have only one ship as a member of that class
>> (not all ships are listed in the Ship table)

Investigate a GROUP BY solution that selects groups having a count of 1.

>> 2. Find the countries that had both battleships and battlecruisers
>> (those fall under type in Classes)

Look at EXISTS for one possible solutions.

>> 3. Find those ships that "lived to fight another day"; they were
>> damaged in one battle, but later fought in another.
>>
>From your model description I don't even see where the position and
attitude of each ship is stored, so I don't think I can give you any
help at all with this one.

>> The best way for me to understand would be relational algebra for each
>> of the statements.
>>   
> 
> 
> Sounds like a homework assignment.    Good luck with it.
> 
> It is, however I was able to get the first 8 done, I am struggling with
> these 3 particular ones. I have to make an SQL file based off of it,
so this
> seems to be a blockage in my works.
>
Good luck with the homework. Remember to acknowledge the help you've had
from this list (particularly your earlier issues: here you just have hints).

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From venutaurus539 at gmail.com  Thu Feb 26 07:55:28 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 04:55:28 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
Message-ID: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>

Hello all,
           I've a strange requirement where I need to run a python
script just as we run an exe (by double clicking through windows
explorer or by typing the script name at command prompt). In that
process I should be able to execute another python script in such a
way that, the second script should continue running but the main one
should terminate without effecting the second one.

                    My requirement may be little confusing so please
get back if you didn't understand what I meant above.


Thank you,
Venu.


From steve at holdenweb.com  Thu Feb 26 07:56:19 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 07:56:19 -0500
Subject: i have problem with glob.glob() in remotely directory
In-Reply-To: <50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
References: <967cd34f0902260105q7d8b33adk579956b275b2d68b@mail.gmail.com>
	<50697b2c0902260116t7ee6f65ei878cdea6086fad6a@mail.gmail.com>
Message-ID: <go63ie$guc$1@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 1:05 AM, lameck kassana <chelaskk at gmail.com> wrote:
>> hey i want to count number of files in remote computer
>>
>> example of my code is
>>
>> import glob
>> import os
>> import time
>> from datetime import date
>> today=date.today()
>> dir_count, file_count=0, 0
>>
>> for files in glob.glob('\\192.168.0.45\files\*.txt'):
> 
> Remember that *backslash is the escape character* in Python, so you
> need to double-up your backslashes in the string literal (or just use
> forward slashes instead, Windows doesn't seem to care for Python in
> most cases). Right now, the path really only starts with 1 backslash
> and it has a formfeed character in it (\f), so it's obviously invalid;
> thus, your problem.
> 
> So you want:
> #looks ugly, doesn't it?
> for files in glob.glob('\\\\192.168.0.45\\files\\*.txt'):
> 
> Or:
> #will probably but not assuredly work
> for files in glob.glob('//192.168.0.45/files/*.txt'):
> 
Or:

for files in glob.glob(r'\\192.168.0.45\files\*.txt'):

Raw string literals are very useful for handling strings with lots of
backslashes in them.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From bborcic at gmail.com  Thu Feb 26 08:00:30 2009
From: bborcic at gmail.com (Boris Borcic)
Date: Thu, 26 Feb 2009 14:00:30 +0100
Subject: Delete all items in the list
In-Reply-To: <50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
Message-ID: <go63ra$jfo$1@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
...
>> L=['a', 'b', 'c', 'a']
>>
>> I want to delete all 'a's from the list.
>> But if L.remove('a') only deletes the first 'a'.
>>
>> How do you delete all 'a's?
> 
> There are several ways. I'd go with a list comprehension:

and for a couple other ways

while 'a' in L : L.remove('a')

L = filter('a'.__ne__,L)



From freelancer317 at gmail.com  Thu Feb 26 08:03:50 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Thu, 26 Feb 2009 08:03:50 -0500
Subject: Queries
In-Reply-To: <go63a1$g44$1@ger.gmane.org>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> <go63a1$g44$1@ger.gmane.org>
Message-ID: <b1d973a70902260503m157ff54ap68d24a59036fc3e7@mail.gmail.com>

2009/2/26 Steve Holden <steve at holdenweb.com>

> Murray wrote:
> [top-posting corrected]
>
> > -----Original Message-----
> > From: Gary Herron [mailto:gherron at islandtraining.com]
> > Sent: Thursday, February 26, 2009 1:46 AM
> > To: mmcclaf; python-list at python.org
> > Subject: Re: Queries
> >
> > mmcclaf wrote:
> >> I have to make  some queries for 4 tables I have. The following
> >> relations are:
> >>
> >> Classes(class, type, country, numGuns, bore, displacement)
> >> Ships (name, class, launched)
> >> Battles (name, date)
> >> Outcomes (ship, battle, result)
> >>
> >> The three queries I'm stuck on are the following:
> >>
> >> 1. Find the classes that have only one ship as a member of that class
> >> (not all ships are listed in the Ship table)
>
> Investigate a GROUP BY solution that selects groups having a count of 1.

DISTINCT may be a simpler solution.

>
>
> >> 2. Find the countries that had both battleships and battlecruisers
> >> (those fall under type in Classes)
>
> Look at EXISTS for one possible solutions.
>
> >> 3. Find those ships that "lived to fight another day"; they were
> >> damaged in one battle, but later fought in another.
> >>
> >From your model description I don't even see where the position and
> attitude of each ship is stored, so I don't think I can give you any
> help at all with this one.
>
> >> The best way for me to understand would be relational algebra for each
> >> of the statements.
> >>
> >
> >
> > Sounds like a homework assignment.    Good luck with it.
> >
> > It is, however I was able to get the first 8 done, I am struggling with
> > these 3 particular ones. I have to make an SQL file based off of it,
> so this
> > seems to be a blockage in my works.
> >
> Good luck with the homework. Remember to acknowledge the help you've had
> from this list (particularly your earlier issues: here you just have
> hints).
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
- Bret
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From tim.wintle at teamrubber.com  Thu Feb 26 08:10:15 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 13:10:15 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
Message-ID: <1235653815.7954.22.camel@tim-laptop>

On Thu, 2009-02-26 at 04:55 -0800, venutaurus539 at gmail.com wrote:
> Hello all,
>            I've a strange requirement where I need to run a python
> script just as we run an exe (by double clicking through windows
> explorer or by typing the script name at command prompt).
I don't know how windows deals with this part
>  In that
> process I should be able to execute another python script in such a
> way that, the second script should continue running but the main one
> should terminate without effecting the second one.
standard daemon behavior I'd have thought

This shows how you would do it (with lots of comments). Assume this
should work on Windows.

http://code.activestate.com/recipes/278731/

note the two child threads to prevent zombies - may not be needed on
windows but good to use them anyway.



From digitig at gmail.com  Thu Feb 26 08:25:29 2009
From: digitig at gmail.com (Tim Rowe)
Date: Thu, 26 Feb 2009 13:25:29 +0000
Subject: Efficient searching through objects
In-Reply-To: <Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>
	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>
	<Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
Message-ID: <aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>

2009/2/26 sert <jerry at hotmail.com>:
> bearophileHUGS at lycos.com wrote in
> news:37632421-5475-4859-be83-07ae2eca1773 at r4g2000yqa.googlegro
> ups.com:
>
>> Try using a dict instead, where keys are the names and
>> objects the values (it turns a linear search in a quick
>> hash look up). . Then tell us the performance changes.
>>
>
> It halved the overall execution time. Thanks.

Good to see that you've already got an improvement. For what it's
worth, this seems to be classic relational database stuff, and a
relational database will be optimised to do these operations and so is
likely to be faster still. I think there are a couple that Python
works well with, but I've never looked into that -- others will no
doubt be along with recommendations now I've raised the subject.

-- 
Tim Rowe


From python.list at tim.thechases.com  Thu Feb 26 08:34:11 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 26 Feb 2009 07:34:11 -0600
Subject: Efficient searching through objects
In-Reply-To: <aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>
References: <Xns9BBE8CCB55D90jtjdfjdfjnbj@147.102.222.230>	<37632421-5475-4859-be83-07ae2eca1773@r4g2000yqa.googlegroups.com>	<Xns9BBE95AD5B9DCjtjdfjdfjnbj@147.102.222.230>
	<aee48b3c0902260525t36ab0334qcd186ca82a519ae8@mail.gmail.com>
Message-ID: <49A69A53.7040800@tim.thechases.com>

> relational database will be optimised to do these operations and so is
> likely to be faster still. I think there are a couple that Python
> works well with, but I've never looked into that -- others will no
> doubt be along with recommendations now I've raised the subject.

batteries-included support for sqlite[1] was added in 2.5 which 
would work pretty well for this application without the overhead 
(resource OR administrative) of something like MySQL or PostgreSQL.

-tkc

[1]
http://docs.python.org/library/sqlite3.html



From steve at holdenweb.com  Thu Feb 26 08:46:57 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 08:46:57 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
Message-ID: <go66hd$slr$1@ger.gmane.org>

lameck kassana wrote:
> i am trying to write script which will count files for remote directory
> which having certain pattern.
>  
Please refrain from repeating questions. When you posted this a reply
had already been made to your original posting. Remember, this isn't a
paid help desk ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From venutaurus539 at gmail.com  Thu Feb 26 09:00:03 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 06:00:03 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
Message-ID: <b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>

On Feb 26, 6:10?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > Hello all,
> > ? ? ? ? ? ?I've a strange requirement where I need to run a python
> > script just as we run an exe (by double clicking through windows
> > explorer or by typing the script name at command prompt).
>
> I don't know how windows deals with this part> ?In that
> > process I should be able to execute another python script in such a
> > way that, the second script should continue running but the main one
> > should terminate without effecting the second one.
>
> standard daemon behavior I'd have thought
>
> This shows how you would do it (with lots of comments). Assume this
> should work on Windows.
>
> http://code.activestate.com/recipes/278731/
>
> note the two child threads to prevent zombies - may not be needed on
> windows but good to use them anyway.

Thanks for the reply,
           Being a newbie to python, I am finding it difficult to
understand the logic even after thorough reading of comments. Is there
any simpler way where I can just run a python script from the main
script and exit without disturbing the second one(This will end based
on some other constraints which can be handled). Or can some one throw
some light on where should I run the function os.system(" python
script2.py") from the main one.

Thank you,
venu


From lkassana at gmail.com  Thu Feb 26 09:03:26 2009
From: lkassana at gmail.com (lameck kassana)
Date: Thu, 26 Feb 2009 17:03:26 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <go66hd$slr$1@ger.gmane.org>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
Message-ID: <c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>

ok my original question is how can count the files of ceratin pattern(eg
*.txt) in remote directory .It seems use of glob.glob() for remote
directory is not working .Example I want to count the files in following
shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can do it
by using glob.glob()

On Thu, Feb 26, 2009 at 4:46 PM, Steve Holden <steve at holdenweb.com> wrote:

> lameck kassana wrote:
> > i am trying to write script which will count files for remote directory
> > which having certain pattern.
> >
> Please refrain from repeating questions. When you posted this a reply
> had already been made to your original posting. Remember, this isn't a
> paid help desk ...
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From dan.barbus at gmail.com  Thu Feb 26 09:04:39 2009
From: dan.barbus at gmail.com (utnapistim)
Date: Thu, 26 Feb 2009 06:04:39 -0800 (PST)
Subject: class property not working in python 2.5.1
References: <2704d479-2f52-4ada-a60e-b4b49b089a7f@z9g2000yqi.googlegroups.com>
	<mailman.790.1235635007.11746.python-list@python.org>
Message-ID: <54ab1846-6dfe-4109-98d8-cd3b5371b13c@s28g2000vbp.googlegroups.com>

On Feb 26, 9:56?am, Christian Heimes <li... at cheimes.de> wrote:
> Dan Barbus schrieb:
>
> > Hi,
>
> > I have a problem with setting a property to a class instance, in
> > python 2.5.1. The property is defined through get and set methods, but
> > when I set it, the setter doesn't get called. Instead, I believe the
> > property in the instance gets replaced with a new object (string).
>
> > I have the following code (stripped down from my program):
>
> > class Model():
> > ? ? def __init__(self, title = ''):
> > ? ? ? ? self._views, self._title = [], None
> > ? ? ? ? self.setTitle(title)
>
> *snip*
>
> Properties don't work correctly on old style classes. You have to
> subclass from object in order to get a new style class.
>
> class Model(object):
> ? ? pass
>
> Christian

Thanks, that solved the problem.


From mmcclaf at gmail.com  Thu Feb 26 09:06:48 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Thu, 26 Feb 2009 06:06:48 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> 
	<mailman.807.1235652909.11746.python-list@python.org>
Message-ID: <8f97b201-33b9-4c7f-a757-b76bd9db1167@f17g2000vbf.googlegroups.com>

On Feb 26, 7:51?am, Steve Holden <st... at holdenweb.com> wrote:
> Murray wrote:
>
> [top-posting corrected]
>
>
>
> > -----Original Message-----
> > From: Gary Herron [mailto:gher... at islandtraining.com]
> > Sent: Thursday, February 26, 2009 1:46 AM
> > To: mmcclaf; python-l... at python.org
> > Subject: Re: Queries
>
> > mmcclaf wrote:
> >> I have to make ?some queries for 4 tables I have. The following
> >> relations are:
>
> >> Classes(class, type, country, numGuns, bore, displacement)
> >> Ships (name, class, launched)
> >> Battles (name, date)
> >> Outcomes (ship, battle, result)
>
> >> The three queries I'm stuck on are the following:
>
> >> 1. Find the classes that have only one ship as a member of that class
> >> (not all ships are listed in the Ship table)
>
> Investigate a GROUP BY solution that selects groups having a count of 1.
>
> >> 2. Find the countries that had both battleships and battlecruisers
> >> (those fall under type in Classes)
>
> Look at EXISTS for one possible solutions.
>
> >> 3. Find those ships that "lived to fight another day"; they were
> >> damaged in one battle, but later fought in another.
>
> >From your model description I don't even see where the position and
>
> attitude of each ship is stored, so I don't think I can give you any
> help at all with this one.
>
> >> The best way for me to understand would be relational algebra for each
> >> of the statements.
>
> > Sounds like a homework assignment. ? ?Good luck with it.
>
> > It is, however I was able to get the first 8 done, I am struggling with
> > these 3 particular ones. I have to make an SQL file based off of it,
> so this
> > seems to be a blockage in my works.
>
> Good luck with the homework. Remember to acknowledge the help you've had
> from this list (particularly your earlier issues: here you just have hints).
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?+1 571 484 6266?+1 800 494 3119
> Holden Web LLC ? ? ? ? ? ? ?http://www.holdenweb.com/

Yeppers always do. And thanks! As for the number 3 one... to know if
they were damaged would appear in "Result" of the Outcomes table


From venutaurus539 at gmail.com  Thu Feb 26 09:09:22 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 06:09:22 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
Message-ID: <328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>

On Feb 26, 7:00?pm, "venutaurus... at gmail.com"
<venutaurus... at gmail.com> wrote:
> On Feb 26, 6:10?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
>
>
> > On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > > Hello all,
> > > ? ? ? ? ? ?I've a strange requirement where I need to run a python
> > > script just as we run an exe (by double clicking through windows
> > > explorer or by typing the script name at command prompt).
>
> > I don't know how windows deals with this part> ?In that
> > > process I should be able to execute another python script in such a
> > > way that, the second script should continue running but the main one
> > > should terminate without effecting the second one.
>
> > standard daemon behavior I'd have thought
>
> > This shows how you would do it (with lots of comments). Assume this
> > should work on Windows.
>
> >http://code.activestate.com/recipes/278731/
>
> > note the two child threads to prevent zombies - may not be needed on
> > windows but good to use them anyway.
>
> Thanks for the reply,
> ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
> understand the logic even after thorough reading of comments. Is there
> any simpler way where I can just run a python script from the main
> script and exit without disturbing the second one(This will end based
> on some other constraints which can be handled). Or can some one throw
> some light on where should I run the function os.system(" python
> script2.py") from the main one.
>
> Thank you,
> venu

Adding to the above.. I've to do it in Windows platform and what I can
see from the illustration (/dev/null) etc. they are for Unix
Environment.

Thank you,
Venu


From steve at holdenweb.com  Thu Feb 26 09:15:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 09:15:23 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
Message-ID: <49A6A3FB.60708@holdenweb.com>

lameck kassana wrote:
> ok my original question is how can count the files of ceratin pattern(eg
> *.txt) in remote directory .It seems use of glob.glob() for remote
> directory is not working .Example I want to count the files in following
> shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can
> do it by using glob.glob() 
> 
>>> glob.glob(r"\\houseboy\sholden\*.txt")
['\\\\houseboy\\sholden\\pgin1.txt',
'\\\\houseboy\\sholden\\POSTGRES.TXT',
'\\\\houseboy\\sholden\\gatesquote.txt',
'\\\\houseboy\\sholden\\UbuntuWhatNow.txt',
 '\\\\houseboy\\sholden\\patch001.txt']
>>> glob.glob(r"\\192.168.2.200\sholden\*.txt")
['\\\\192.168.2.200\\sholden\\pgin1.txt',
'\\\\192.168.2.200\\sholden\\POSTGRES.TXT',
'\\\\192.168.2.200\\sholden\\gatesquote.txt',
'\\\\192.168.2.200\\sholden\\UbuntuWhatNow.txt',
'\\\\192.168.2.200\\sholden\\patch001.txt']
>>>

Working just fine for me.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From freelancer317 at gmail.com  Thu Feb 26 09:20:47 2009
From: freelancer317 at gmail.com (Bret Fledderjohn)
Date: Thu, 26 Feb 2009 09:20:47 -0500
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<328c4626-9158-4957-ba4c-162ca626feed@h20g2000yqn.googlegroups.com>
Message-ID: <b1d973a70902260620r30b54abdufc371671446dc370@mail.gmail.com>

2009/2/26 venutaurus539 at gmail.com <venutaurus539 at gmail.com>

> On Feb 26, 7:00 pm, "venutaurus... at gmail.com"
> <venutaurus... at gmail.com> wrote:
> > On Feb 26, 6:10 pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> >
> >
> >
> > > On Thu, 2009-02-26 at 04:55 -0800, venutaurus... at gmail.com wrote:
> > > > Hello all,
> > > >            I've a strange requirement where I need to run a python
> > > > script just as we run an exe (by double clicking through windows
> > > > explorer or by typing the script name at command prompt).
> >
> > > I don't know how windows deals with this part>  In that
> > > > process I should be able to execute another python script in such a
> > > > way that, the second script should continue running but the main one
> > > > should terminate without effecting the second one.
> >
> > > standard daemon behavior I'd have thought
> >
> > > This shows how you would do it (with lots of comments). Assume this
> > > should work on Windows.
> >
> > >http://code.activestate.com/recipes/278731/
> >
> > > note the two child threads to prevent zombies - may not be needed on
> > > windows but good to use them anyway.
> >
> > Thanks for the reply,
> >            Being a newbie to python, I am finding it difficult to
> > understand the logic even after thorough reading of comments. Is there
> > any simpler way where I can just run a python script from the main
> > script and exit without disturbing the second one(This will end based
> > on some other constraints which can be handled). Or can some one throw
> > some light on where should I run the function os.system(" python
> > script2.py") from the main one.
> >
> > Thank you,
> > venu
>
> Adding to the above.. I've to do it in Windows platform and what I can
> see from the illustration (/dev/null) etc. they are for Unix
> Environment.


For making a script executable try this link
http://www.python.org/doc/faq/windows/#how-do-i-make-python-scripts-executable



-- 
- Bret
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From gagsl-py2 at yahoo.com.ar  Thu Feb 26 09:27:31 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 12:27:31 -0200
Subject: thread safe to lock on key, val pairs on a dict instead of entire
	dict?
References: <bc40b182-4f9f-4e5e-964c-16042f2179aa@o11g2000yql.googlegroups.com>
Message-ID: <op.upyqf5h2x6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 00:39:30 -0200, birdsong <david.birdsong at gmail.com>  
escribi?:

> Dictionaries just store references to objects, right?  So is it thread
> safe to lock a specific key/val pair on a dictionary and modify its
> val and release the lock?
>
> example snippet:
> # assuming d_lock  was initialized long ago in a thread-safe manner
> d_lock.acquire()
> d = {}
> d[1] = (threading.Lock(), [])
> d_lock.release()
>
> # test key level locking
> for key, data in d.items():
>   row_lock, rows = data
>   row_lock.acquire()
>   rows.append(1)
>   row_lock.release()
>
> Of course, I'll have to lock the entire dict when adding keys that
> dont exist, but further calls and acquire the key specific lock before
> doing any write operations.

(All of this applies to CPython only)
Subscript assignment is a single opcode. If the key's __hash__ and  
__eq__/__cmp__ don't call any Python code, nor does the destructor of the  
previous dict entry, then the operation is atomic (no other thread may be  
executed due to the GIL).
list.append is atomic.

Note that the *append* operation is atomic (or the dict assignment), not  
the whole statement:
L.append(some[values]+to**be.computed(L))
Evaluating the argument to append isn't atomic at all.

References:
http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm
http://effbot.org/zone/thread-synchronization.htm
http://coreygoldberg.blogspot.com/2008/09/python-thread-synchronization-and.html

-- 
Gabriel Genellina



From jdnier at gmail.com  Thu Feb 26 09:38:34 2009
From: jdnier at gmail.com (David Niergarth)
Date: Thu, 26 Feb 2009 06:38:34 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org>
Message-ID: <4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>

On Feb 16, 11:21?pm, Yuanxin Xi <xi11w... at gmail.com> wrote:
> Could anyone please explain why this happens? ?It seems some memory
> are not freed.

There is a "bug" in versions of Python prior to 2.5 where memory
really isn't released back to the OS. Python 2.5 contains a new object
allocator that is able to return memory to the operating system that
fixes this issue. Here's an explanation:

http://evanjones.ca/python-memory-part3.html

What version of Python are you using? I have a machine running several
long-running processes, each of which occasionally spike up to 500M
memory usage, although normally they only require about 25M. Prior to
2.5, those processes never released that memory back to the OS and I
would need to periodically restart them. With 2.5, this is no longer a
problem. I don't always see memory usage drop back down immediately
but the OS does recover the memory eventually. Make sure you use 2.5
if this is an issue for you.

--David


From tim.wintle at teamrubber.com  Thu Feb 26 09:47:47 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 14:47:47 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
Message-ID: <1235659667.7954.56.camel@tim-laptop>

On Thu, 2009-02-26 at 06:00 -0800, venutaurus539 at gmail.com wrote:
> Thanks for the reply,
>            Being a newbie to python, I am finding it difficult to
> understand the logic even after thorough reading of comments. Is there
> any simpler way where I can just run a python script from the main
> script and exit without disturbing the second one(This will end based
> on some other constraints which can be handled). Or can some one throw
> some light on where should I run the function os.system(" python
> script2.py") from the main one.

That would be a simple way of doing it :-)



From jdnier at gmail.com  Thu Feb 26 10:00:34 2009
From: jdnier at gmail.com (David Niergarth)
Date: Thu, 26 Feb 2009 07:00:34 -0800 (PST)
Subject: memory recycling/garbage collecting problem
References: <mailman.85.1234848079.11746.python-list@python.org> 
	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>
Message-ID: <adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>

Tim Peters showed a way to demonstrate the fix in

http://mail.python.org/pipermail/python-dev/2006-March/061991.html

> For simpler fun, run this silly little program, and look at memory
> consumption at the prompts:
>
> """
> x = []
> for i in xrange(1000000):
>    x.append([])
> raw_input("full ")
> del x[:]
> raw_input("empty ")
> """
>
> For example, in a release build on WinXP, VM size is about 48MB at the
> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
> (without this patch), VM size falls relatively little from what it is
> at the "full" prompt (the contiguous vector holding a million
> PyObject* pointers is freed, but the obmalloc arenas holding a
> million+1 list objects are never freed).
>
> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>
>     http://evanjones.ca/memory-allocator.pdf

I'm not sure what deleting a slice accomplishes (del x[:]); the
behavior is the same whether I do del x or del x[:]. Any ideas?

--David


From hv at tbz-pariv.de  Thu Feb 26 10:10:02 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Thu, 26 Feb 2009 16:10:02 +0100
Subject: OT: handling multiple software repositories
Message-ID: <70npmbFgb464U1@mid.individual.net>

Hi,

this is a bit off topic.

In our company we have several SVN repositories.

According to [1] Trac by default only handles one
repository.

Of course Trac links like changeset [1234] would not work anymore.
You would need [repro/1234] or something like this.

I think many (python) programmer have several repositories
and need to handle this somehow.

How do you do this?

I want a common wiki and a common bug tracker. It should
be possible to attach a bug to several repositories.

Up to now I don't use Trac, if someone has an alternative, please
tell me!

  Thomas

[1] http://trac.edgewall.org/wiki/MultipleRepositorySupport


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From ptmcg at austin.rr.com  Thu Feb 26 10:11:08 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 26 Feb 2009 09:11:08 -0600
Subject: XML Parsing
In-Reply-To: <206436.56338.qm@web27404.mail.ukl.yahoo.com>
References: <c8497da3-c8a5-4912-9f9c-7246cbeaf685@h20g2000yqn.googlegroups.com>
	<206436.56338.qm@web27404.mail.ukl.yahoo.com>
Message-ID: <D891AF9DC46D4271869FA07F178F50B9@AWA2>

You flatter me sir (or madam? can't tell from your name...), but I wouldn't
presume to so lofty a title among this crowd.  I'd save that for the likes
of Alan Gauld and Kent Johnson, who are much more prolific  and informative
contributors to this list than I.

-- Paul


-----Original Message-----
From: hrishy [mailto:hrishys at yahoo.co.uk] 
Sent: Wednesday, February 25, 2009 11:36 PM
To: python-list at python.org; Paul McGuire
Subject: Re: XML Parsing

Ha the guru himself responding :-)


--- On Wed, 25/2/09, Paul McGuire <ptmcg at austin.rr.com> wrote:

> From: Paul McGuire <ptmcg at austin.rr.com>
> Subject: Re: XML Parsing
> To: python-list at python.org
> Date: Wednesday, 25 February, 2009, 2:04 PM On Feb 25, 1:17?am, hrishy 
> <hris... at yahoo.co.uk>
> wrote:
> > Hi
> >
> > Something like this
> >
> <snip solution using ElementTree>
> >
> > Note i am not a python programmer just a enthusiast
> and i was curious why people on the list didnt suggest a code like 
> above
> >
> 
> You just beat the rest of us to it - good example of ElementTree for 
> parsing XML (and I Iearned the '//' shortcut for one or more 
> intervening tag levels).
> 
> To the OP: if you are parsing XML, I would look hard at the modules 
> (esp. ElementTree) that are written explicitly for XML, before 
> considering using regular expressions.  There are just too many 
> potential surprises when trying to match XML tags - presence/absence/ 
> order of attributes, namespaces, whitespace inside tags, to name a 
> few.
> 
> -- Paul
> --
> http://mail.python.org/mailman/listinfo/python-list


      



From gagsl-py2 at yahoo.com.ar  Thu Feb 26 10:26:56 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 13:26:56 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org>
Message-ID: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 11:00:30 -0200, Boris Borcic <bborcic at gmail.com>  
escribi?:

> Chris Rebert wrote:
>> On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
> ...
>>> L=['a', 'b', 'c', 'a']
>>>
>>> I want to delete all 'a's from the list.
>>> But if L.remove('a') only deletes the first 'a'.
>>>
>>> How do you delete all 'a's?
>>  There are several ways. I'd go with a list comprehension:
>
> and for a couple other ways
>
> while 'a' in L : L.remove('a')

This is probably the worst way, takes cuadratic time (and two searches per  
loop).

> L = filter('a'.__ne__,L)

And this is probably the fastest. But not all types define __ne__ so a  
more generic answer would be:

 from functools import partial
 from operator import ne
L = filter(partial(ne, 'a'), L)

Of course, this is only relevant if L is large and there are many  
duplicates. In other cases I'd stick with the list comprehension as posted  
by Chris Rebert.

-- 
Gabriel Genellina



From mal at egenix.com  Thu Feb 26 10:27:44 2009
From: mal at egenix.com (M.-A. Lemburg)
Date: Thu, 26 Feb 2009 16:27:44 +0100
Subject: PyCrypto AES MODE_CBC  - How to?
In-Reply-To: <70krl9Fbuqj5U1@mid.dfncis.de>
References: <70krdfFc7rn0U1@mid.dfncis.de> <70krl9Fbuqj5U1@mid.dfncis.de>
Message-ID: <49A6B4F0.6040600@egenix.com>

On 2009-02-25 13:25, Helmut Jarausch wrote:
> Helmut Jarausch wrote:
>> Hi,
>>
>> I've just tried to write a simple example using PyCrypto's
>> AES (CBC mode)
>>
>> #!/usr/bin/python
>> from Crypto.Cipher import AES
>>
>> PWD='abcdefghijklmnop'
>> Initial16bytes='0123456789ABCDEF'
>>
>> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
>> # crypt = AES.new(PWD, AES.MODE_ECB)
>>
>> txt = 'ea523a664dabaa4476d31226a1e3bab0'
>>
>> c = crypt.encrypt(txt)
>>
>> txt_plain=crypt.decrypt(c)
>>
>> print txt_plain
>>
>> Unfortunately, txt_plain differs from txt - why?
>> (Using MODE_ECB does work however)
>>
> 
> I just discovered that the following variant seems to work
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes)
> c = crypt.encrypt(txt)
> crypt = AES.new(PWD, AES.MODE_CBC,Initial16bytes) # <<< re-initialize
> txt_plain=crypt.decrypt(c)
> 
> So, the crypt object seems to keep some state.
> I haven't seen this mentioned in the documentation.

In CBC mode, all previous encryptions affect the next one,
since the blocks are chained:

http://en.wikipedia.org/wiki/Cipher_block_chaining#Cipher-block_chaining_.28CBC.29

In ECB mode, they are not, but then it doesn't provide much
security unless you change the key frequently:

http://en.wikipedia.org/wiki/Cipher_block_chaining#Electronic_codebook_.28ECB.29

(the wiki pages provide some nice graphics to see what's going
on and why CBC is better than ECB)

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Feb 26 2009)
>>> Python/Zope Consulting and Support ...        http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ...             http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/
________________________________________________________________________

::: Try our new mxODBC.Connect Python Database Interface for free ! ::::


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From venutaurus539 at gmail.com  Thu Feb 26 10:32:27 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 07:32:27 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<mailman.819.1235659670.11746.python-list@python.org>
Message-ID: <74abbd25-624a-4f79-8ffe-249b625d0c74@w34g2000yqm.googlegroups.com>

On Feb 26, 7:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2009-02-26 at 06:00 -0800, venutaurus... at gmail.com wrote:
> > Thanks for the reply,
> > ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
> > understand the logic even after thorough reading of comments. Is there
> > any simpler way where I can just run a python script from the main
> > script and exit without disturbing the second one(This will end based
> > on some other constraints which can be handled). Or can some one throw
> > some light on where should I run the function os.system(" python
> > script2.py") from the main one.
>
> That would be a simple way of doing it :-)

When I run that script on Windows it fails throwing the below error:

AttributeError: 'module' object has no attribute 'fork'

Please help me out..



From Shawn at Milochik.com  Thu Feb 26 10:35:44 2009
From: Shawn at Milochik.com (Shawn Milochik)
Date: Thu, 26 Feb 2009 10:35:44 -0500
Subject: The Python's regex different from Perl's , I want know what's the 
	different?
In-Reply-To: <49A67B73.4090408@tim.thechases.com>
References: <6934d4d5-257f-451d-b318-0fabe42c84e8@q11g2000yqh.googlegroups.com>
	<49A67B73.4090408@tim.thechases.com>
Message-ID: <2dc0c81b0902260735u491d5cbbr9b72e021cd0ae334@mail.gmail.com>

The regular expression syntax is basically exactly the same. The main
difference is that a regex can't just be written into a statement as
part of the syntax; you have to create a regular expression object and
use its methods.

So, instead of:
    new_thing =~ s/pattern/replacement/
it's:
    myPattern = re.compile(r'pattern')
    new_thing = myPattern.sub(replacement, input_string)
or:
    new_thing = re.sub(pattern, replacement, input_string)

Also, backreferences are \1 instead of $1, and you have to escape the
backslash or use a raw string for the backslash.

I've found this page to be pretty helpful:
http://www.regular-expressions.info/python.html

Shawn


From jjposner at snet.net  Thu Feb 26 10:44:03 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 26 Feb 2009 10:44:03 -0500
Subject: Delete all items in the list
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org> <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <A5856B8A28E74BC4A0DCE2BE985B292D@AMDUP>

 >> 
 >> > L = filter('a'.__ne__,L)
 >> 
 >> And this is probably the fastest. But not all types define 
 >> __ne__ so a  
 >> more generic answer would be:
 >> 
 >>  from functools import partial
 >>  from operator import ne
 >> L = filter(partial(ne, 'a'), L)
 >> 

And don't forget this "traditional" solution:

>>> L=['a', 'b', 'c', 'a']
>>> filter(lambda arg: arg != 'a', L)
['b', 'c']

-John





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Database version: 5.11850
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From jjposner at snet.net  Thu Feb 26 10:52:19 2009
From: jjposner at snet.net (John Posner)
Date: Thu, 26 Feb 2009 10:52:19 -0500
Subject: functools.partial (was: Delete all items in the list)
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>
	<go63ra$jfo$1@ger.gmane.org> <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <F4970D8BAF9B4623830ADA7BC67F2452@AMDUP>

 >> 
 >>  from functools import partial
 >>  from operator import ne
 >> L = filter(partial(ne, 'a'), L)
 >> 

I learned about functools.partial only recently (on this list). functools is
implemented in C, not Python, so I couldn't answer this question for myself:

  Is functools.partial completely equivalent to a manually-coded closure?

Help, please.

-John





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Database version: 5.11850
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From mail at timgolden.me.uk  Thu Feb 26 11:10:15 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 26 Feb 2009 16:10:15 +0000
Subject: OT: handling multiple software repositories
In-Reply-To: <70npmbFgb464U1@mid.individual.net>
References: <70npmbFgb464U1@mid.individual.net>
Message-ID: <49A6BEE7.2090605@timgolden.me.uk>

Thomas Guettler wrote:
> Hi,
> 
> this is a bit off topic.
> 
> In our company we have several SVN repositories.
> 
> According to [1] Trac by default only handles one
> repository.
> 
> Of course Trac links like changeset [1234] would not work anymore.
> You would need [repro/1234] or something like this.
> 
> I think many (python) programmer have several repositories
> and need to handle this somehow.
> 
> How do you do this?
> 
> I want a common wiki and a common bug tracker. It should
> be possible to attach a bug to several repositories.
> 
> Up to now I don't use Trac, if someone has an alternative, please
> tell me!


Have a look at DrProject[1], a Trac-alike which handles
multiple projects. (Not used it myself).

TJG

[1] https://www.drproject.org/


From mmcclaf at gmail.com  Thu Feb 26 11:17:19 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Thu, 26 Feb 2009 08:17:19 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<49A63A90.4080003@islandtraining.com>
	<B1EE9CB351104851B082ADD40129E3D3@user> 
	<mailman.807.1235652909.11746.python-list@python.org>
	<8f97b201-33b9-4c7f-a757-b76bd9db1167@f17g2000vbf.googlegroups.com>
Message-ID: <51a7b90d-50ee-45d4-800e-541f01e81e66@m4g2000vbp.googlegroups.com>

Another problem with this assignment... I have to list all the ships
mentioned in the database. All the ships may not appear in the Ships
relations... I said the following in algebraic expression

SELECT name(Ships UNION (SELECT ship (Outcome UNION(SELECT class
(Classes)))

Would that work?


From google at mrabarnett.plus.com  Thu Feb 26 11:18:19 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Thu, 26 Feb 2009 16:18:19 +0000
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
References: <49A67300.6050303@unixcluster.dk>
Message-ID: <49A6C0CB.3000704@mrabarnett.plus.com>

jkv wrote:
> Hi,
> 
> Are there any way to change the EOL character for sys.stdin.readline() 
> and raw_input()?
> My problem is that i cannot rely on that the clients connection to my 
> application will end all lines with \n or \r\n. Sometimes they will use 
> \r\000 as EOL.
> 
> Example from my code:
> 
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
> 
> If the client sends 'qwerty\r\n' everything is fine and the password get 
> stored in the variable. But sometimes, depending on how broken the 
> telnet client are, the client will send 'qwerty\r\000' instead and then 
> my application will hang at 'password = raw_input()' forever.
> 
> Any suggestions?
> 
Could you insert some kind of filter into the input stream? The filter
would replace '\r\000' with '\r\n' (or just '\000' with '\n').

old_stdin = sys.stdin
try:
    sys.stdin = MyFilter(sys.stdin)
    ...
finally:
    sys.stdin = old_stdin

I don't know how many methods you would need to provide.


From kyrie at uh.cu  Thu Feb 26 11:22:38 2009
From: kyrie at uh.cu (Luis Zarrabeitia)
Date: Thu, 26 Feb 2009 11:22:38 -0500
Subject: OT: handling multiple software repositories
In-Reply-To: <49A6BEE7.2090605@timgolden.me.uk>
References: <70npmbFgb464U1@mid.individual.net>
	<49A6BEE7.2090605@timgolden.me.uk>
Message-ID: <200902261122.38127.kyrie@uh.cu>

On Thursday 26 February 2009 11:10:15 am Tim Golden wrote:
> Have a look at DrProject[1], a Trac-alike which handles
> multiple projects. (Not used it myself).
>
> [1] https://www.drproject.org/

I've used DrProject a bit (my gf is one of the developers). If you like trac, 
chances are that you will love DrProject.

It's quite good (and easy to install, unlike gforge), but the developers are 
moving on to a version 2.0 that you can find around here: 

http://basieproject.org/   (yeah, the website is ugly). 

If you like trac, take a look at DrProject and keep an eye on Basie.

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matem?tica y Computaci?n, UH.
http://profesores.matcom.uh.cu/~kyrie


From steve at holdenweb.com  Thu Feb 26 11:30:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 11:30:41 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
References: <mailman.85.1234848079.11746.python-list@python.org>
	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>
	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
Message-ID: <go6g4f$3b5$1@ger.gmane.org>

David Niergarth wrote:
> Tim Peters showed a way to demonstrate the fix in
> 
> http://mail.python.org/pipermail/python-dev/2006-March/061991.html
> 
>> For simpler fun, run this silly little program, and look at memory
>> consumption at the prompts:
>>
>> """
>> x = []
>> for i in xrange(1000000):
>>    x.append([])
>> raw_input("full ")
>> del x[:]
>> raw_input("empty ")
>> """
>>
>> For example, in a release build on WinXP, VM size is about 48MB at the
>> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
>> (without this patch), VM size falls relatively little from what it is
>> at the "full" prompt (the contiguous vector holding a million
>> PyObject* pointers is freed, but the obmalloc arenas holding a
>> million+1 list objects are never freed).
>>
>> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>>
>>     http://evanjones.ca/memory-allocator.pdf
> 
> I'm not sure what deleting a slice accomplishes (del x[:]); the
> behavior is the same whether I do del x or del x[:]. Any ideas?
> 
del x removes the name x from the current namespace, garbage collecting
the object to which it referred. del x[:] leaves x referencing a cleared
list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From gagsl-py2 at yahoo.com.ar  Thu Feb 26 11:41:07 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 14:41:07 -0200
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.811.1235653820.11746.python-list@python.org>
	<b4bb9279-b3e0-48c8-8c5e-30999f235b00@q9g2000yqc.googlegroups.com>
	<mailman.819.1235659670.11746.python-list@python.org>
	<74abbd25-624a-4f79-8ffe-249b625d0c74@w34g2000yqm.googlegroups.com>
Message-ID: <op.upywmtfex6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 13:32:27 -0200, venutaurus539 at gmail.com  
<venutaurus539 at gmail.com> escribi?:

> On Feb 26, 7:47?pm, Tim Wintle <tim.win... at teamrubber.com> wrote:
>> On Thu, 2009-02-26 at 06:00 -0800, venutaurus... at gmail.com wrote:
>> > Thanks for the reply,
>> > ? ? ? ? ? ?Being a newbie to python, I am finding it difficult to
>> > understand the logic even after thorough reading of comments. Is there
>> > any simpler way where I can just run a python script from the main
>> > script and exit without disturbing the second one(This will end based
>> > on some other constraints which can be handled). Or can some one throw
>> > some light on where should I run the function os.system(" python
>> > script2.py") from the main one.
>>
>> That would be a simple way of doing it :-)
>
> When I run that script on Windows it fails throwing the below error:
>
> AttributeError: 'module' object has no attribute 'fork'
>
> Please help me out..

Unless you have any special needs, just stick to os.system("...")

-- 
Gabriel Genellina



From dchandran1 at yahoo.com  Thu Feb 26 11:49:24 2009
From: dchandran1 at yahoo.com (Deepak Chandran)
Date: Thu, 26 Feb 2009 08:49:24 -0800 (PST)
Subject: embedding Python in a shared library
Message-ID: <17626.86208.qm@web111101.mail.gq1.yahoo.com>

I have embedded Python in a shared library. This works fine in Windows (dll), but I get the following error is Ubuntu when I try to load modules:
/usr/lib/python2.5/lib-dynload/time.so: error: symbol lookup
error: undefined symbol: PyExc_ValueError



I found many postings on this issue on the internet, but I was not able to find a solution that worked. I tried to load libpython2.5.so.1 into my program using dlopen, but that crashed the program for some reason. I tried building my library using the libpython2.5.a, but the same error was there.

I am sure someone has a solution to this, since it seems like a general issue. 


      
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From benjamin at python.org  Thu Feb 26 11:58:43 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Thu, 26 Feb 2009 16:58:43 +0000 (UTC)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
Message-ID: <loom.20090226T165802-937@post.gmane.org>

Raymond Hettinger <python <at> rcn.com> writes:

> 
> Here's a proposed implementation for Py2.7 and Py3.1:
> 
>     http://code.activestate.com/recipes/576669/
> 
> Would like you guys to kick the tires, exercise it a bit, and let me
> know what you think.  The recipe runs under 2.6 and 3.0 without
> modification so it should be easy to play with.

Why not just inherit from collections.MutableMapping?





From tjreedy at udel.edu  Thu Feb 26 13:11:31 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:11:31 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
References: <49A67300.6050303@unixcluster.dk>
Message-ID: <go6m0e$q8j$1@ger.gmane.org>

jkv wrote:
> Hi,
> 
> Are there any way to change the EOL character for sys.stdin.readline() 
> and raw_input()?
> My problem is that i cannot rely on that the clients connection to my 
> application will end all lines with \n or \r\n. Sometimes they will use 
> \r\000 as EOL.
> 
> Example from my code:
> 
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
> 
> If the client sends 'qwerty\r\n' everything is fine and the password get 
> stored in the variable. But sometimes, depending on how broken the 
> telnet client are, the client will send 'qwerty\r\000' instead and then 
> my application will hang at 'password = raw_input()' forever.

Can you put that in a separate thread with timeout?



From patrick.oloughlin at gmail.com  Thu Feb 26 13:14:56 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Thu, 26 Feb 2009 18:14:56 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
Message-ID: <cc34a9320902261014o2397e59bm7a5df2a7619287df@mail.gmail.com>

Try this as an outline:
#### script1.py
from subprocess import Popen

if __name__ == '__main__':
	scriptname = "script2.py"

	Popen("python %s" % scriptname, shell=True)


	print "I'm done"


#### script2.py
from time import sleep

if __name__ == '__main__':
    while (True):
        print "waiting.."
        sleep(2)

###########################
If you install python using the Windows Installer (.exe), it should
set up .py files to be opened by python when double-clicking on them.
Alternatively, you can right-click on your .py file and go to "Open
With..." then "choose program", then click "Browse...", you can Browse
to the python executable, so Explorer will use it to open .py files
when you double-click on them.

As someone else mentioned there is also a py2exe program. Google it.

2009/2/26 venutaurus539 at gmail.com <venutaurus539 at gmail.com>:
> Hello all,
> ? ? ? ? ? I've a strange requirement where I need to run a python
> script just as we run an exe (by double clicking through windows
> explorer or by typing the script name at command prompt). In that
> process I should be able to execute another python script in such a
> way that, the second script should continue running but the main one
> should terminate without effecting the second one.
>
> ? ? ? ? ? ? ? ? ? ?My requirement may be little confusing so please
> get back if you didn't understand what I meant above.
>
>
> Thank you,
> Venu.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From mkhitrov at gmail.com  Thu Feb 26 13:17:42 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Thu, 26 Feb 2009 13:17:42 -0500
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
Message-ID: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>

Greetings,

I'm looking for a function in the standard library or pywin32 package
that will block until a certain condition is met or it is interrupted
by Ctrl-C. For example, time.sleep() would have been perfect for my
needs if thread.interrupt_main() could interrupt the call from another
thread in the same way that Ctrl-C does. Unfortunately, that is not
the case.

Another thing I tried was creating a pipe with os.pipe() and issuing a
read call on it. The event to exit was a single byte written to the
other end of the pipe, but Ctrl-C could not interrupt the read call.
The threading.Event class does not work for me, because it uses short
sleep intervals for timed waits. I need the reaction to be as close to
instant as possible, something like this will not do:

while not <some condition is met>:
   sleep(0.01)

I actually replaced threading.Event with my own version that uses
native Windows events, and waits on those also cannot be interrupted
by Ctrl-C. I'm trying to achieve the same effect as that while loop
and I don't care what the condition to exit is, but the loop needs to
exit as soon as the condition is met without waiting for up to X
additional milliseconds. Any ideas?

- Max


From tjreedy at udel.edu  Thu Feb 26 13:22:12 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:22:12 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <go6g4f$3b5$1@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>
	<go6g4f$3b5$1@ger.gmane.org>
Message-ID: <go6mkf$q8j$2@ger.gmane.org>

Steve Holden wrote:
> David Niergarth wrote:
>> Tim Peters showed a way to demonstrate the fix in
>>
>> http://mail.python.org/pipermail/python-dev/2006-March/061991.html
>>
>>> For simpler fun, run this silly little program, and look at memory
>>> consumption at the prompts:
>>>
>>> """
>>> x = []
>>> for i in xrange(1000000):
>>>    x.append([])
>>> raw_input("full ")
>>> del x[:]
>>> raw_input("empty ")
>>> """
>>>
>>> For example, in a release build on WinXP, VM size is about 48MB at the
>>> "full" prompt, and drops to 3MB at the "empty" prompt.  In the trunk
>>> (without this patch), VM size falls relatively little from what it is
>>> at the "full" prompt (the contiguous vector holding a million
>>> PyObject* pointers is freed, but the obmalloc arenas holding a
>>> million+1 list objects are never freed).
>>>
>>> For more info about the patch, see Evan's slides from _last_ year's PyCon:
>>>
>>>     http://evanjones.ca/memory-allocator.pdf
>> I'm not sure what deleting a slice accomplishes (del x[:]); the
>> behavior is the same whether I do del x or del x[:]. Any ideas?
>>
> del x removes the name x from the current namespace, garbage collecting
> the object to which it referred.

If there is another reference to the list, which there well might be in 
an actual application with memory problems, then 'del x' only 
disassociates the name but the object and its large contents are not gc'ed.

 > del x[:] leaves x referencing a cleared list.

which is guaranteed to be cleared, regardless of other refs.

Terry



From tjreedy at udel.edu  Thu Feb 26 13:22:18 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 13:22:18 -0500
Subject: Delete all items in the list
In-Reply-To: <op.upys66sex6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>
	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>
Message-ID: <go6mkl$q8j$3@ger.gmane.org>

Gabriel Genellina wrote:

> 
>> L = filter('a'.__ne__,L)
> 
> And this is probably the fastest. But not all types define __ne__ 

In Py3, all classes inherit .__ne__ from 'object'.



From steve at holdenweb.com  Thu Feb 26 13:40:04 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 13:40:04 -0500
Subject: memory recycling/garbage collecting problem
In-Reply-To: <go6mkf$q8j$2@ger.gmane.org>
References: <mailman.85.1234848079.11746.python-list@python.org>	<4d007dac-3782-4b53-9dec-2bcd6accf750@z9g2000yqi.googlegroups.com>	<adf858aa-232d-45a6-9b5e-a70cfccc60fb@x38g2000yqj.googlegroups.com>	<go6g4f$3b5$1@ger.gmane.org>
	<go6mkf$q8j$2@ger.gmane.org>
Message-ID: <go6nn4$4an$1@ger.gmane.org>

Terry Reedy wrote:
> Steve Holden wrote:
>> David Niergarth wrote:
[...]
>>> I'm not sure what deleting a slice accomplishes (del x[:]); the
>>> behavior is the same whether I do del x or del x[:]. Any ideas?
>>>
>> del x removes the name x from the current namespace, garbage collecting
>> the object to which it referred.
> 
> If there is another reference to the list, which there well might be in
> an actual application with memory problems, then 'del x' only
> disassociates the name but the object and its large contents are not gc'ed.
> 
>> del x[:] leaves x referencing a cleared list.
> 
> which is guaranteed to be cleared, regardless of other refs.
> 
Nice catch, Terry! You correctly spotted I was assuming that d
represented the only reference to the list.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Thu Feb 26 13:42:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 13:42:51 -0500
Subject: Delete all items in the list
In-Reply-To: <go6mkl$q8j$3@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>
	<go6mkl$q8j$3@ger.gmane.org>
Message-ID: <go6nsb$4an$2@ger.gmane.org>

Terry Reedy wrote:
> Gabriel Genellina wrote:
> 
>>
>>> L = filter('a'.__ne__,L)
>>
>> And this is probably the fastest. But not all types define __ne__ 
> 
> In Py3, all classes inherit .__ne__ from 'object'.
> 
Isn't that inherited method just an identity comparison?

However in this particular case the main point is that str *does*
implement __ne__. So as long as that built-in method doesn't call the
other operand's __ne__ there should be no problem.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From skip at pobox.com  Thu Feb 26 13:59:03 2009
From: skip at pobox.com (skip at pobox.com)
Date: Thu, 26 Feb 2009 12:59:03 -0600
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A6C0CB.3000704@mrabarnett.plus.com>
References: <49A67300.6050303@unixcluster.dk>
	<49A6C0CB.3000704@mrabarnett.plus.com>
Message-ID: <18854.58999.266079.542928@montanaro.dyndns.org>

What is it about with statements that makes you want to so frequently embed
them in try/except statements?

Skip


From jkv at unixcluster.dk  Thu Feb 26 14:06:06 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 20:06:06 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <go6m0e$q8j$1@ger.gmane.org>
References: <49A67300.6050303@unixcluster.dk> <go6m0e$q8j$1@ger.gmane.org>
Message-ID: <49A6E81E.80802@unixcluster.dk>

Terry Reedy wrote:
> jkv wrote:
>> Hi,
>>
>> Are there any way to change the EOL character for 
>> sys.stdin.readline() and raw_input()?
>> My problem is that i cannot rely on that the clients connection to my 
>> application will end all lines with \n or \r\n. Sometimes they will 
>> use \r\000 as EOL.
>>
>> Example from my code:
>>
>>    sys.stdout.write('Password: ');
>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>    password = raw_input()
>>
>> If the client sends 'qwerty\r\n' everything is fine and the password 
>> get stored in the variable. But sometimes, depending on how broken 
>> the telnet client are, the client will send 'qwerty\r\000' instead 
>> and then my application will hang at 'password = raw_input()' forever.
>
> Can you put that in a separate thread with timeout?
I guess i could - wouldn't know how thou, just getting started in python.

Is there any way i can read stdin character by character? In C i would 
loop over 'ch = getch();' and in each iteration push the character to 
the password variable unless  ch equals to \r.
Anyway to do something like this in python?

Regards,
jkv



From exarkun at divmod.com  Thu Feb 26 14:42:46 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 14:42:46 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A67300.6050303@unixcluster.dk>
Message-ID: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>

On Thu, 26 Feb 2009 11:46:24 +0100, jkv <jkv at unixcluster.dk> wrote:
>Hi,
>
>Are there any way to change the EOL character for sys.stdin.readline() and 
>raw_input()?
>My problem is that i cannot rely on that the clients connection to my 
>application will end all lines with \n or \r\n. Sometimes they will use 
>\r\000 as EOL.
>
>Example from my code:
>
>    sys.stdout.write('Password: ');
>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>    password = raw_input()
>
>If the client sends 'qwerty\r\n' everything is fine and the password get 
>stored in the variable. But sometimes, depending on how broken the telnet 
>client are, the client will send 'qwerty\r\000' instead and then my 
>application will hang at 'password = raw_input()' forever.
>
>Any suggestions?

It sounds like you might want to use a real implementation of the telnet
protocol in your application.  Such an implementation would deal with the
fact that telnet encodes \r as \r\0 for you.

Twisted includes a telnet implementation, as well as facilities for reading
stdin asynchronously (which will let you avoid indefinite hangs).

Jean-Paul


From cosmo_general at yahoo.com  Thu Feb 26 15:19:07 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Thu, 26 Feb 2009 12:19:07 -0800 (PST)
Subject: How to parse form in client side?
Message-ID: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>

Hi Folks,

cgi module can easily acquire the all fields of data input from client
side, through a form. Then, a simple line of code:

form_dict = cgi.FieldStorage()

grabs all data into a dictionary form_dict. The rest becomes a piece
of cake by querying the form_dict. Nice!

However, it is done in the server side. Now I want to do the same in
the client side. first of all, I get the source code of a HTML form by
using urllib, from server, with code below:

html_source = urllib.urlopen(URL).read()

Then, I need to parse this html_source file, at client side. Is there
a module to handle this? Can somebody help? Thanks!


Muddy Coder


From clp2 at rebertia.com  Thu Feb 26 15:22:00 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 12:22:00 -0800
Subject: How to parse form in client side?
In-Reply-To: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
References: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
Message-ID: <50697b2c0902261222u5931dcb5p9ac17df09808578e@mail.gmail.com>

On Thu, Feb 26, 2009 at 12:19 PM, Muddy Coder <cosmo_general at yahoo.com> wrote:
> Hi Folks,
>
> cgi module can easily acquire the all fields of data input from client
> side, through a form. Then, a simple line of code:
>
> form_dict = cgi.FieldStorage()
>
> grabs all data into a dictionary form_dict. The rest becomes a piece
> of cake by querying the form_dict. Nice!
>
> However, it is done in the server side. Now I want to do the same in
> the client side. first of all, I get the source code of a HTML form by
> using urllib, from server, with code below:
>
> html_source = urllib.urlopen(URL).read()
>
> Then, I need to parse this html_source file, at client side. Is there
> a module to handle this? Can somebody help? Thanks!

http://wwwsearch.sourceforge.net/ClientForm/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gnewsg at gmail.com  Thu Feb 26 15:27:26 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 26 Feb 2009 12:27:26 -0800 (PST)
Subject: How can I know when a sub-process is effectively initialized?
Message-ID: <375e4766-de16-4afc-a082-a03317c179f0@r4g2000yqa.googlegroups.com>

Hi,
I'm working on a Python module called psutil [1] for reading process
information in a cross-platform way.
I'm having a problem with psutil test suite.
Almost all the test cases we implemented so far look like this:

def test_foo(self):
    test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
stderr=DEVNULL)
    time.sleep(0.1)  # XXX: provisional, give some time the sub
process to initialize
    p = psutil.Process(test_process.pid)
    # start test here
    ...

As you can see we put a time.sleep(0.1) call after subprocess.Popen()
as a provisional workaround to let the sub process initialize
properly.
We're searching for some kind of way to know when the child process is
properly initialized so that we can actually start testing cases
without worries.
Does someone has an idea how could we do that?

[1] http://code.google.com/p/psutil/

Thanks a lot in advance,



--- Giampaolo
[1] http://code.google.com/p/pyftpdlib


From tjreedy at udel.edu  Thu Feb 26 15:27:38 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 26 Feb 2009 15:27:38 -0500
Subject: Delete all items in the list
In-Reply-To: <go6nsb$4an$2@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>	<go6mkl$q8j$3@ger.gmane.org>
	<go6nsb$4an$2@ger.gmane.org>
Message-ID: <go6tvm$sfs$1@ger.gmane.org>

Steve Holden wrote:
> Terry Reedy wrote:
>> Gabriel Genellina wrote:
>>
>>>> L = filter('a'.__ne__,L)
>>> And this is probably the fastest. But not all types define __ne__ 
>> In Py3, all classes inherit .__ne__ from 'object'.
>>
> Isn't that inherited method just an identity comparison?

Yes.  And so is, by default, the snipped slower proposed alternative of 
lambda x: a!= x.

> However in this particular case the main point is that str *does*
> implement __ne__. So as long as that built-in method doesn't call the
> other operand's __ne__ there should be no problem.
> 
> regards
>  Steve



From steve at holdenweb.com  Thu Feb 26 15:31:06 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 15:31:06 -0500
Subject: Delete all items in the list
In-Reply-To: <go6tvm$sfs$1@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<50697b2c0902260315i754f9d39y3231f30435824bb5@mail.gmail.com>	<go63ra$jfo$1@ger.gmane.org>	<op.upys66sex6zn5v@gabriel.sleipnir-bsas>	<go6mkl$q8j$3@ger.gmane.org>	<go6nsb$4an$2@ger.gmane.org>
	<go6tvm$sfs$1@ger.gmane.org>
Message-ID: <go6u7b$sjs$1@ger.gmane.org>

Terry Reedy wrote:
> Steve Holden wrote:
>> Terry Reedy wrote:
>>> Gabriel Genellina wrote:
>>>
>>>>> L = filter('a'.__ne__,L)
>>>> And this is probably the fastest. But not all types define __ne__ 
>>> In Py3, all classes inherit .__ne__ from 'object'.
>>>
>> Isn't that inherited method just an identity comparison?
> 
> Yes.  And so is, by default, the snipped slower proposed alternative of
> lambda x: a!= x.
> 
But shouldn't that have been lambda x: 'a' != x, which would have
invoked the string (3.0, Unicode) comparison method?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From nick at craig-wood.com  Thu Feb 26 15:31:53 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Thu, 26 Feb 2009 14:31:53 -0600
Subject: Extending Python Questions .....
References: <c105de15-bc88-4543-9068-bd920c05cd6e@m2g2000vbp.googlegroups.com>
	<slrngq611k.c4u.nick@irishsea.home.craig-wood.com>
	<7e1a6ec9-8457-40ef-a3da-a16b5dac1100@r34g2000vbp.googlegroups.com>
	<slrngq8ae1.enu.nick@irishsea.home.craig-wood.com>
	<33411bf0-396a-4aef-83ad-4d4e68b26050@l22g2000vba.googlegroups.com>
Message-ID: <slrngqdt6s.3jd.nick@irishsea.home.craig-wood.com>

Ben <bnsilinux at gmail.com> wrote:
>  On Feb 24, 11:31?am, Nick Craig-Wood <n... at craig-wood.com> wrote:
> > So do you want to embed python into your code?
> >
> > I'm still not clear what you are trying to achieve with python, though
> > I have a better idea what SLAG is now!
> 
>  Actually no, I want to EXTEND python using the lower levels of S-lang
>  screen modules.

Ah!

>  My Modules are written in C and are a frame work for building pull-
>  down menus and data entry screens.
> 
>  Very nice for writing business applications. Think along the lines
>  of FoxPro and/or the "Screen" section in Cobol and you have a
>  pretty good idea of what i have done.

You've got several choices.

1) Write a python module in C which interfaces with your C code.

This is the traditional way, but it is quite time consuming and easy
to slip up with reference counting.  You need to learn the python API
to use this.

Will require compiling by your users (not a big hurdle if you make a
setup.py).

2) Write an interface with ctypes

If your C code presents itself as a shared object (dll/so) then this
is a really nice way of using it.  You don't have to write any C code
or worry about any reference counting - you do it all in python.

You'll need to learn how ctypes maps python onto C, but as you know C
well you won't find this difficult.

ctypes is included with python now.

3) Use Cython

Cython is a sort of hybrid C and python which can be used for
interfacing with C code.

This requires learning exactly what you can and can't do in Cython (it
is almost python but not quite).

This will require your users to install Cython and compile stuff.
Again easy if you make a setup.py but more stuff to install.

4) Use Swig

A solid approach, quicker than 1) but not as quick as 2) or 3)

This will require your users to install swig and a compiler.

...

My prefered approach is 2) ctypes at the moment.  I have used all 4 of
the above approaches in the past though!

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From m.shanmugarajan at gmail.com  Thu Feb 26 15:37:33 2009
From: m.shanmugarajan at gmail.com (Shanmuga Rajan)
Date: Thu, 26 Feb 2009 15:37:33 -0500
Subject: removing duplication from a huge list.
Message-ID: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>

Hi


I have a list of Records with some details.(more than 15 million records)
with duplication

I need to iterate through every record and need to eliminate duplicate
records.

Currently i am using a script like this.


counted_recs = [ ]
x = some_fun()  #  will return a generator, this generator is the source of
list. because i dont want to carry entire 15 million records in a list(need
more 1 gb of memory)

for rec in x:
    if rec[0] not in counted_recs:
        #some logics goes here...
        counted_recs.append(rec[0])        # i need to have rec[0]=name
alone from record.


but i am sure this is not a optimized way to do.
so i came up with a different solution. but i am not confident in that
solution too

here my second solution.

counted_recs = []

x = some_fun()

#x = [ rec[0] for rec in x]

for rec in x:
    if counted_recs.count(rec[0]) > 0 :
        # some logic goes here
        counted_recs.append(rec[0])


which one is better?  if any one suggests better solution then i will be
very happy.

Advance thanks for any help.


Shan
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From gagsl-py2 at yahoo.com.ar  Thu Feb 26 15:47:13 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 18:47:13 -0200
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
Message-ID: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 16:17:42 -0200, Maxim Khitrov <mkhitrov at gmail.com>  
escribi?:

> I'm looking for a function in the standard library or pywin32 package
> that will block until a certain condition is met or it is interrupted
> by Ctrl-C. For example, time.sleep() would have been perfect for my
> needs if thread.interrupt_main() could interrupt the call from another
> thread in the same way that Ctrl-C does. Unfortunately, that is not
> the case.
>
> Another thing I tried was creating a pipe with os.pipe() and issuing a
> read call on it. The event to exit was a single byte written to the
> other end of the pipe, but Ctrl-C could not interrupt the read call.
> The threading.Event class does not work for me, because it uses short
> sleep intervals for timed waits. I need the reaction to be as close to
> instant as possible, something like this will not do:
>
> while not <some condition is met>:
>    sleep(0.01)
>
> I actually replaced threading.Event with my own version that uses
> native Windows events, and waits on those also cannot be interrupted
> by Ctrl-C. I'm trying to achieve the same effect as that while loop
> and I don't care what the condition to exit is, but the loop needs to
> exit as soon as the condition is met without waiting for up to X
> additional milliseconds. Any ideas?

You may try MsgWaitForMultipleObjects - send a message to the main thread  
 from the other thread.
An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,  
but I've never actually tried in Python.

-- 
Gabriel Genellina



From exarkun at divmod.com  Thu Feb 26 15:59:38 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 15:59:38 -0500
Subject: How can I know when a sub-process is effectively initialized?
In-Reply-To: <375e4766-de16-4afc-a082-a03317c179f0@r4g2000yqa.googlegroups.com>
Message-ID: <20090226205938.12853.1013496395.divmod.quotient.14307@henry.divmod.com>

On Thu, 26 Feb 2009 12:27:26 -0800 (PST), Giampaolo Rodola' <gnewsg at gmail.com> wrote:
>Hi,
>I'm working on a Python module called psutil [1] for reading process
>information in a cross-platform way.
>I'm having a problem with psutil test suite.
>Almost all the test cases we implemented so far look like this:
>
>def test_foo(self):
>    test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
>stderr=DEVNULL)
>    time.sleep(0.1)  # XXX: provisional, give some time the sub
>process to initialize
>    p = psutil.Process(test_process.pid)
>    # start test here
>    ...
>
>As you can see we put a time.sleep(0.1) call after subprocess.Popen()
>as a provisional workaround to let the sub process initialize
>properly.
>We're searching for some kind of way to know when the child process is
>properly initialized so that we can actually start testing cases
>without worries.
>Does someone has an idea how could we do that?

Hi Giampaolo,

"Properly initialized" is application specific.  Generally, what you want
to do is have the child process tell you when it's ready.  A common way
to do this is for the child to write some bytes to a file descriptor the
parent is monitoring when it is ready.  The parent then just waits for
those bytes.  It looks like you entirely control the child in this case,
so that should be possible here.

Alternatively, maybe by "properly initialized" you mean something very
specific about how subprocess.Popen creates processes.  If so, can you
elaborate a bit?

Jean-Paul


From mh at pixar.com  Thu Feb 26 16:29:19 2009
From: mh at pixar.com (mh at pixar.com)
Date: Thu, 26 Feb 2009 21:29:19 GMT
Subject: best way to parse a function-call-like string?
Message-ID: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>

I have some strings that look like function calls, e.g.

	"junkpkg.f1"
	"junkpkg.f1()"
	"junkpkg.f1('aaa')"
	"junkpkg.f1('aaa','bbb')"
	"junkpkg.f1('aaa','bbb','ccc')"
	"junkpkg.f1('aaa','with,comma')"

and I need to split them into the function name and list of parms, e.g.

	"junkpkg.f1", []
	"junkpkg.f1", []
	"junkpkg.f1", ['aaa']
	"junkpkg.f1", ['aaa','bbb']
	"junkpkg.f1", ['aaa','bbb','ccc']
	"junkpkg.f1", ['aaa','with,comma']

What's the best way to do this?  I would be interested in either
of two approaches:

   - a "real" way which comprehensively

   - a quick-and-dirty way which handles most cases, so that I
     can get my coding partner running quickly while I do the
     "real" way.  will the csv module do the right thing for
     the parm list?

Many TIA!!
Mark




-- 
Mark Harrison
Pixar Animation Studios


From hniksic at xemacs.org  Thu Feb 26 16:38:19 2009
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Thu, 26 Feb 2009 22:38:19 +0100
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
Message-ID: <871vtk7ub8.fsf@mulj.homelinux.net>

Raymond Hettinger <python at rcn.com> writes:

> Here's a proposed implementation for Py2.7 and Py3.1:
>
>     http://code.activestate.com/recipes/576669/

    Several methods like __contains__() and __getitem__() are not
    overridden, so their performance is just as fast as a regular
    dictionary.

    Methods like __setitem__ and __delitem__ are overridden but have a
    fast path depending on whether or not the key already exists.

It seems that __delitem__ of an existing key is O(n), whereas it's
amortized constant time for dicts.  (__setitem__ is constant time for
both.)  Is there a way to avoid this?

If not, it should probably be documented, since it differs from dict.


From tim.wintle at teamrubber.com  Thu Feb 26 16:39:09 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 21:39:09 +0000
Subject: best way to parse a function-call-like string?
In-Reply-To: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <1235684349.4128.14.camel@tim-laptop>

On Thu, 2009-02-26 at 21:29 +0000, mh at pixar.com wrote:
> I have some strings that look like function calls, e.g.
> 
> "junkpkg.f1"
> "junkpkg.f1()"
> "junkpkg.f1('aaa')"
> "junkpkg.f1('aaa','bbb')"
> "junkpkg.f1('aaa','bbb','ccc')"
> "junkpkg.f1('aaa','with,comma')"
> 
> and I need to split them into the function name and list of parms,
> e.g.
> 
> "junkpkg.f1", []
> "junkpkg.f1", []
> "junkpkg.f1", ['aaa']
> "junkpkg.f1", ['aaa','bbb']
> "junkpkg.f1", ['aaa','bbb','ccc']
> "junkpkg.f1", ['aaa','with,comma']
> 

quick and dirty

for s in string_list:
    if "(" in s and s[-1] == ")":
      parts = s.split("(")
      fn, args = s[0],s[1][:-1].split(",")


Tim Wintle



From mh at pixar.com  Thu Feb 26 16:42:06 2009
From: mh at pixar.com (mh at pixar.com)
Date: Thu, 26 Feb 2009 21:42:06 GMT
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
	<mailman.850.1235684625.11746.python-list@python.org>
Message-ID: <O0Epl.13712$D32.3728@flpi146.ffdc.sbc.com>

Robert Kern <robert.kern at gmail.com> wrote:
> On 2009-02-26 15:29, mh at pixar.com wrote:
> Use the compiler module to generate an AST and walk it. That's the real 
> way. For me, that would also be the quick way because I am familiar with 
> the API, but it may take you a little bit of time to get used to it.

ah, that's just what I was hoping for...
in the meantime, here's my quick and dirty:


import csv

def fakeparse(s):

    print "======="
    argl=[]
    ix=s.find('(')
    if ix == -1:
        func=s
        argl=[]
    else:
        func=s[0:ix]
        argstr=s[ix+1:]
        argstr=argstr[:argstr.rfind(')')]
        print argstr
        for argl in csv.reader([argstr], quotechar="'"):
            pass

    print s
    print func
    print argl

    return func,argl


print fakeparse("junkpkg.f1")
print fakeparse("junkpkg.f1()")
print fakeparse("junkpkg.f1('aaa')")
print fakeparse("junkpkg.f1('aaa','bbb')")
print fakeparse("junkpkg.f1('aaa','bbb','ccc')")
print fakeparse("junkpkg.f1('aaa','xx,yy')")


-- 
Mark Harrison
Pixar Animation Studios


From tim.wintle at teamrubber.com  Thu Feb 26 16:42:43 2009
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 26 Feb 2009 21:42:43 +0000
Subject: best way to parse a function-call-like string?
In-Reply-To: <1235684349.4128.14.camel@tim-laptop>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
	<1235684349.4128.14.camel@tim-laptop>
Message-ID: <1235684563.4128.19.camel@tim-laptop>

On Thu, 2009-02-26 at 21:39 +0000, Tim Wintle wrote:
> On Thu, 2009-02-26 at 21:29 +0000, mh at pixar.com wrote:
> > "junkpkg.f1", ['aaa','with,comma']
oops - missed this one, ignore my last reply.






From robert.kern at gmail.com  Thu Feb 26 16:43:32 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 26 Feb 2009 15:43:32 -0600
Subject: best way to parse a function-call-like string?
In-Reply-To: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <go72e5$cun$1@ger.gmane.org>

On 2009-02-26 15:29, mh at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> 	"junkpkg.f1"
> 	"junkpkg.f1()"
> 	"junkpkg.f1('aaa')"
> 	"junkpkg.f1('aaa','bbb')"
> 	"junkpkg.f1('aaa','bbb','ccc')"
> 	"junkpkg.f1('aaa','with,comma')"
>
> and I need to split them into the function name and list of parms, e.g.
>
> 	"junkpkg.f1", []
> 	"junkpkg.f1", []
> 	"junkpkg.f1", ['aaa']
> 	"junkpkg.f1", ['aaa','bbb']
> 	"junkpkg.f1", ['aaa','bbb','ccc']
> 	"junkpkg.f1", ['aaa','with,comma']
>
> What's the best way to do this?  I would be interested in either
> of two approaches:
>
>     - a "real" way which comprehensively
>
>     - a quick-and-dirty way which handles most cases, so that I
>       can get my coding partner running quickly while I do the
>       "real" way.  will the csv module do the right thing for
>       the parm list?

Use the compiler module to generate an AST and walk it. That's the real 
way. For me, that would also be the quick way because I am familiar with 
the API, but it may take you a little bit of time to get used to it.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though 
it had
  an underlying truth."
   -- Umberto Eco



From JesseAldridge at gmail.com  Thu Feb 26 16:48:08 2009
From: JesseAldridge at gmail.com (Jesse Aldridge)
Date: Thu, 26 Feb 2009 13:48:08 -0800 (PST)
Subject: Can someone explain this behavior to me?
Message-ID: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>

I have one module called foo.py
---------------------
class Foo:
    foo = None

def get_foo():
    return Foo.foo

if __name__ == "__main__":
    import bar
    Foo.foo = "foo"
    bar.go()
---------------------
And another one called bar.py
---------------------
import foo

def go():
    assert foo.get_foo() == "foo"
----------------------
When I run foo.py, the assertion in bar.py fails.  Why?


From sjmachin at lexicon.net  Thu Feb 26 17:02:53 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 26 Feb 2009 14:02:53 -0800 (PST)
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <41d63877-0166-4b82-872e-3ddbf6d35dff@d2g2000pra.googlegroups.com>

On Feb 27, 8:29?am, m... at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> ? ? ? ? "junkpkg.f1"
> ? ? ? ? "junkpkg.f1()"
> ? ? ? ? "junkpkg.f1('aaa')"
> ? ? ? ? "junkpkg.f1('aaa','bbb')"
> ? ? ? ? "junkpkg.f1('aaa','bbb','ccc')"
> ? ? ? ? "junkpkg.f1('aaa','with,comma')"

Examples are better than no examples, but a grammar would be a great
help. What about
   "junkpkg.f1('aaa','with)parenthesis')"
   "junkpkg.f1('aaa','with''ONEapostrophe')"

>
> and I need to split them into the function name and list of parms, e.g.
>
> ? ? ? ? "junkpkg.f1", []
> ? ? ? ? "junkpkg.f1", []
> ? ? ? ? "junkpkg.f1", ['aaa']
> ? ? ? ? "junkpkg.f1", ['aaa','bbb']
> ? ? ? ? "junkpkg.f1", ['aaa','bbb','ccc']
> ? ? ? ? "junkpkg.f1", ['aaa','with,comma']
>
> What's the best way to do this? ?I would be interested in either
> of two approaches:
>
> ? ?- a "real" way which comprehensively
>
> ? ?- a quick-and-dirty way which handles most cases, so that I
> ? ? ?can get my coding partner running quickly while I do the
> ? ? ?"real" way. ?will the csv module do the right thing for
> ? ? ?the parm list?

It should, for "most cases". Any reason you can't try it out for
yourself?

It appears to "work" in the sense that if you have isolated a string
containing the parameters, the csv module can be used to "parse" it:

| Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on win32
| Type "help", "copyright", "credits" or "license" for more
information.
| >>> import csv, cStringIO
| >>> argstring = "'aaa','with,comma'"
| >>> csvargs = lambda s: list(csv.reader(cStringIO.StringIO(s),
quotechar="'"))
| >>> csvargs(argstring)
| [['aaa', 'with,comma']]
| >>> csvargs("'aaa','with''ONEapostrophe'")
| [['aaa', "with'ONEapostrophe"]]
| >>>

HTH
John


From clp2 at rebertia.com  Thu Feb 26 17:13:29 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 14:13:29 -0800
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>

On Thu, Feb 26, 2009 at 1:48 PM, Jesse Aldridge <JesseAldridge at gmail.com> wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
> ? ?foo = None
>
> def get_foo():
> ? ?return Foo.foo
>
> if __name__ == "__main__":
> ? ?import bar
> ? ?Foo.foo = "foo"
> ? ?bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
>
> def go():
> ? ?assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails. ?Why?

Not sure, but circular imports are *evil* anyway, so I'd suggest you
just rewrite the code to avoid doing any circular imports in the first
place.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From gschells at hotmail.com  Thu Feb 26 17:23:27 2009
From: gschells at hotmail.com (Gary Schells)
Date: Thu, 26 Feb 2009 17:23:27 -0500
Subject: PythonWin -vs- Idle
Message-ID: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>



Hello,

Python newbie here.  I am working with Python and geoprocessing in
ArcGIS.  I'm taking a training course online and the exercise I'm
working on makes mention of using PythonWin instead of Idle.



I am using version 2.5 and have not been able to locate PythonWin.  The
download just includes Idle for the environment.  Can anyone point me
in the right direction to download the PythonWin piece of this puzzle?



Thank you

_________________________________________________________________
It?s the same Hotmail?. If by ?same? you mean up to 70% faster. 
http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_HM_AE_Same_022009
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From mabdelkader at gmail.com  Thu Feb 26 17:25:38 2009
From: mabdelkader at gmail.com (ma)
Date: Thu, 26 Feb 2009 17:25:38 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
	<50697b2c0902261413p13ad7df9tffa50fa4d04662c9@mail.gmail.com>
Message-ID: <148918f0902261425g50a31279w9b42f55b65886fd5@mail.gmail.com>

I'm pretty sure that Foo is getting replaced once you import Foo, why not
pass the Foo() object to bar's go? I'm sure there are other ways, but yes,
circular imports are indeed evil.


On Thu, Feb 26, 2009 at 5:13 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Thu, Feb 26, 2009 at 1:48 PM, Jesse Aldridge <JesseAldridge at gmail.com>
> wrote:
> > I have one module called foo.py
> > ---------------------
> > class Foo:
> >    foo = None
> >
> > def get_foo():
> >    return Foo.foo
> >
> > if __name__ == "__main__":
> >    import bar
> >    Foo.foo = "foo"
> >    bar.go()
> > ---------------------
> > And another one called bar.py
> > ---------------------
> > import foo
> >
> > def go():
> >    assert foo.get_foo() == "foo"
> > ----------------------
> > When I run foo.py, the assertion in bar.py fails.  Why?
>
> Not sure, but circular imports are *evil* anyway, so I'd suggest you
> just rewrite the code to avoid doing any circular imports in the first
> place.
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...
> http://rebertia.com
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jkv at unixcluster.dk  Thu Feb 26 17:33:39 2009
From: jkv at unixcluster.dk (jkv)
Date: Thu, 26 Feb 2009 23:33:39 +0100
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>
References: <20090226194246.12853.561696535.divmod.quotient.14283@henry.divmod.com>
Message-ID: <49A718C3.2020002@unixcluster.dk>

Jean-Paul Calderone wrote:
>    sys.stdout.write('Password: ');
>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>    password = raw_input()
>>
>> If the client sends 'qwerty\r\n' everything is fine and the password 
>> get stored in the variable. But sometimes, depending on how broken 
>> the telnet client are, the client will send 'qwerty\r\000' instead 
>> and then my application will hang at 'password = raw_input()' forever.
>>
>> Any suggestions?
>
> It sounds like you might want to use a real implementation of the telnet
> protocol in your application.  Such an implementation would deal with the
> fact that telnet encodes \r as \r\0 for you.
>
> Twisted includes a telnet implementation, as well as facilities for 
> reading
> stdin asynchronously (which will let you avoid indefinite hangs).
I am running this script inside a wrapper (honeyd), so i cant really use 
twisted since i don't have raw network access - i only got stdout, stdin 
and stderr to play with.

But i found a solution, posting it here for the archives:

password = ""
while 1:
   c = sys.stdin.read(1)
   if c == '\r' or c == '\n':
       break
   password = password + c



Regards,
jkv


From Lie.1296 at gmail.com  Thu Feb 26 17:39:12 2009
From: Lie.1296 at gmail.com (Lie)
Date: Thu, 26 Feb 2009 14:39:12 -0800 (PST)
Subject: "Battleship" style game
References: <mailman.750.1235579371.11746.python-list@python.org> 
	<Otepl.44730$8Z.9486@tornado.fastwebnet.it>
	<mailman.751.1235580620.11746.python-list@python.org>
Message-ID: <1dca1b53-dbc9-4b36-b4b8-18ee657b0438@v18g2000pro.googlegroups.com>

On Feb 26, 3:50?am, Shawn Milochik <Sh... at Milochik.com> wrote:
> On Wed, Feb 25, 2009 at 11:38 AM, Marco Mariani <ma... at sferacarta.com> wrote:
>
> > Yes it's in Python alright, but it's not Pythonese yet. You could try
> > avoiding the getter/setter stuff, and camelCase method naming, things like
> > that, for a start.
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> What do you mean avoiding the getter/setter stuff? If I understand
> correctly, you're saying to directly access the attributes, which I
> specifically want to avoid because I may want to enforce some rules
> (such as not changing a ship length after it's created).

I just want to add the note that since you're planning to move the
code to Java, although you should avoid getter and setter in python
(since it's redundant because of property), you should use getter and
setter in the Java version because it is the best practice in Java.

> The camel-case thing I get -- I use that and this_type quite a bit,
> probably because of the inconsistency of the languages I use
> regularly, and standards at work and conventions in my hobby
> programming.



From clp2 at rebertia.com  Thu Feb 26 17:40:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 14:40:50 -0800
Subject: PythonWin -vs- Idle
In-Reply-To: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
Message-ID: <50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>

On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gschells at hotmail.com> wrote:
>
> Hello,
> Python newbie here.? I am working with Python and geoprocessing in ArcGIS.
> I'm taking a training course online and the exercise I'm working on makes
> mention of using PythonWin instead of Idle.
>
> I am using version 2.5 and have not been able to locate PythonWin.? The
> download just includes Idle for the environment.? Can anyone point me in the
> right direction to download the PythonWin piece of this puzzle?

Seems to be included in http://sourceforge.net/projects/pywin32/

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From sjmachin at lexicon.net  Thu Feb 26 17:44:40 2009
From: sjmachin at lexicon.net (John Machin)
Date: Thu, 26 Feb 2009 14:44:40 -0800 (PST)
Subject: Can someone explain this behavior to me?
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <95d96ea7-1e3d-425e-be99-655a68ffaeca@l33g2000pri.googlegroups.com>

On Feb 27, 8:48?am, Jesse Aldridge <JesseAldri... at gmail.com> wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
> ? ? foo = None
>
> def get_foo():
> ? ? return Foo.foo
>
> if __name__ == "__main__":
> ? ? import bar
> ? ? Foo.foo = "foo"
> ? ? bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
>
> def go():
> ? ? assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails. ?Why?

AFAICT from that convoluted mess, because there are two rabbit holes,
__main__.Foo.foo and foo.Foo.foo, and you poked "foo" down the wrong
one. In any case the other one is not the right one -- as you have
already been advised, circular imports are evil.


From exarkun at divmod.com  Thu Feb 26 17:50:38 2009
From: exarkun at divmod.com (Jean-Paul Calderone)
Date: Thu, 26 Feb 2009 17:50:38 -0500
Subject: EOL for sys.stdin.readline() and raw_input()
In-Reply-To: <49A7186D.8050609@unixcluster.dk>
Message-ID: <20090226225038.12853.1517515098.divmod.quotient.14356@henry.divmod.com>

On Thu, 26 Feb 2009 23:32:13 +0100, jkv <jkv at unixcluster.dk> wrote:
>Jean-Paul Calderone wrote:
>>    sys.stdout.write('Password: ');
>>>    #IAC DO ECHO     sys.stdout.write('\xFF\xFB\x01')
>>>    password = raw_input()
>>>
>>>If the client sends 'qwerty\r\n' everything is fine and the password get 
>>>stored in the variable. But sometimes, depending on how broken the telnet 
>>>client are, the client will send 'qwerty\r\000' instead and then my 
>>>application will hang at 'password = raw_input()' forever.
>>>
>>>Any suggestions?
>>
>>It sounds like you might want to use a real implementation of the telnet
>>protocol in your application.  Such an implementation would deal with the
>>fact that telnet encodes \r as \r\0 for you.
>>
>>Twisted includes a telnet implementation, as well as facilities for reading
>>stdin asynchronously (which will let you avoid indefinite hangs).
>I running this script inside a wrapper (honeyd), so i cant really use 
>twisted since i dont have raw network access - i only got stdout, stdin and 
>stderr to play with.
>
>But i found a solution, posting it here for the archives:
>
>password = ""
>while 1:
>    c = sys.stdin.read(1)
>    if c == '\r' or c == '\n':
>        break
>    password = password + c
>

Glad you figured something out.  Just for the record, you can use Twisted
to write applications that interact with stdio, so the fact that you're
using honeyd doesn't prevent you from using Twisted.

Jean-Paul


From python at rcn.com  Thu Feb 26 17:54:53 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 14:54:53 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<mailman.832.1235667533.11746.python-list@python.org>
Message-ID: <6f96323f-6263-4306-872c-544c76ec231f@40g2000prx.googlegroups.com>

[Benjamin Peterson]
> Why not just inherit from collections.MutableMapping?

It makes the recipe shorter to inherit some methods from dict.  Also,
subclassing from dict gives a speedup for __getitem__(), __len__(),
and get().


From ptmcg at austin.rr.com  Thu Feb 26 17:56:17 2009
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Thu, 26 Feb 2009 14:56:17 -0800 (PST)
Subject: best way to parse a function-call-like string?
References: <PQDpl.17854$yr3.8902@nlpi068.nbdc.sbc.com>
Message-ID: <64326bcf-0968-4589-bfd0-65a5c452e962@q9g2000yqc.googlegroups.com>

On Feb 26, 3:29?pm, m... at pixar.com wrote:
> I have some strings that look like function calls, e.g.
>
> ? ? ? ? "junkpkg.f1"
> ? ? ? ? "junkpkg.f1()"
> ? ? ? ? "junkpkg.f1('aaa')"
> ? ? ? ? "junkpkg.f1('aaa','bbb')"
> ? ? ? ? "junkpkg.f1('aaa','bbb','ccc')"
> ? ? ? ? "junkpkg.f1('aaa','with,comma')"
>
> and I need to split them into the function name and list of parms, e.g.
>

Pyparsing will easily carve up these function declarations, and will
give you some room for easy extension once your parsing job starts to
grow to include other variants (like arguments other than quoted
strings, for instance).  Using the results names ("name" and "args"),
then parsed fields are easy to get at after the parsing is done.

-- Paul

from pyparsing import Word, alphas, alphanums, delimitedList, \
    Optional, Literal, Suppress, quotedString

LPAR,RPAR = map(Suppress,"()")
ident = Word(alphas+"_", alphanums+"_")
fnName = delimitedList(ident,".",combine=True)
arg = quotedString
fnCall = fnName("name") + Optional(LPAR +
        Optional(delimitedList(arg)) + RPAR, default=[])("args")

tests = """junkpkg.f1
        junkpkg.f1()
        junkpkg.f1('aaa')
        junkpkg.f1('aaa','bbb')
        junkpkg.f1('aaa','bbb','ccc')
        junkpkg.f1('aaa','with,comma')""".splitlines()

for t in tests:
    fn = fnCall.parseString(t)
    print fn.name
    for a in fn.args:
        print "-",a
    print

Prints:

junkpkg.f1

junkpkg.f1

junkpkg.f1
- 'aaa'

junkpkg.f1
- 'aaa'
- 'bbb'

junkpkg.f1
- 'aaa'
- 'bbb'
- 'ccc'

junkpkg.f1
- 'aaa'
- 'with,comma'


From python at rcn.com  Thu Feb 26 17:57:26 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 14:57:26 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
Message-ID: <da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>

[Hrvoje Niksic]
> It seems that __delitem__ of an existing key is O(n), whereas it's
> amortized constant time for dicts. ?(__setitem__ is constant time for
> both.) ?Is there a way to avoid this?

I don't see any fast/clean way.  It's possible to tracking pending
deletions
and do them all at once but that's a bit messy and slow.


> If not, it should probably be documented, since it differs from dict.

That makes sense.


Raymond



From jgardner at jonathangardner.net  Thu Feb 26 18:10:20 2009
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Thu, 26 Feb 2009 15:10:20 -0800 (PST)
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>

On Feb 20, 6:31?am, Trip Technician <luke.d... at gmail.com> wrote:
> anyone interested in looking at the following problem.
>
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
>
> 33 = 2^(3+2)+1 = 3^3+(3*2)
>
> are both minimal, using 4 digits but
>
> 33 = ((3+2)*2+1)*3
>
> using 5 is not.
>
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
>
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.


Actually, representing 33 has an even shorter answer: '33'

There is actually a really easy solution for this. What you are really
doing is finding the shortest path from point A (the expression '') to
another expression that evaluates to the target number.

>From each point, you can take steps that (a) add a digit to the end or
(b) add an operator---but only if it makes sense. Since operators
don't count, those steps don't add anything to the distance, while the
digits do.

What you do is you start walking the map from point A to some
mysterious point that evaluates to the result you want. Actually, you
send out walkers in all directions, and tell only the walkers that
have taken the fewest steps to take another step. Once a walker gets
to an expression with the result, you have your answer since he is the
first walker to get there. When a walker gets to an expression that
has already been visited, you can tell that walker to go home since
his path was no good. When a walker gets to an expression that
evaluates to a value you have already seen, that walker too should go
home since he has just found a longer path to the same result.

So you have a set of walkers, and each walker has the expression they
used to get to where they are and how many steps they took to get
there. You also have a set of values you have seen before and thus
values that if a walker finds you are no longer interested in.

For each iteration, you take each surviving walker and spawn a new
walker that takes a step in each possible direction. Then you check if
any of those walkers found the value you are looking for. If so,
you've found the answer. If they hit a value you've already seen, you
drop that walker from the set.

The only hanging point is parentheses. What you can do here is instead
of building a linear expression, build a tree expression that shows
the operations and the values they operate. It should be trivial to
calculate all the different new trees that are one digit longer than a
previous tree.


From http  Thu Feb 26 18:26:05 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 15:26:05 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
Message-ID: <7xd4d4hjaq.fsf@ruckus.brouhaha.com>

Raymond Hettinger <python at rcn.com> writes:
> I don't see any fast/clean way.  It's possible to tracking pending
> deletions and do them all at once but that's a bit messy and slow.

What about using a second dictionary (indexed by the incrementing
counter) instead of a list to record the insertion order?  Then you
have O(1) deletion, and traversal takes an O(n log n) sorting
operation.


From python at rcn.com  Thu Feb 26 18:41:39 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 15:41:39 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
Message-ID: <6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>

[Paul Rubin]
> What about using a second dictionary (indexed by the incrementing
> counter) instead of a list to record the insertion order? ?Then you
> have O(1) deletion, and traversal takes an O(n log n) sorting
> operation.

My first attempt used exactly that approach and it works fine
though it does complicate the code quite a bit and slows down
all of the common operations by a constant factor.


Raymond


From python at rcn.com  Thu Feb 26 18:46:05 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 15:46:05 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
Message-ID: <60b78693-b5af-452c-8081-86ff75679e64@z6g2000pre.googlegroups.com>

> > What about using a second dictionary (indexed by the incrementing
> > counter) instead of a list to record the insertion order? ?Then you
> > have O(1) deletion, and traversal takes an O(n log n) sorting
> > operation.

> My first attempt used exactly that approach and it works fine
> though it does complicate the code quite a bit and slows down
> all of the common operations by a constant factor.

FWIW, here is the code for that approach.

--------------------------------------
from collections import MutableMapping

class OrderedDict(dict):

    def __init__(self, *args, **kwds):
        if len(args) > 1:
            raise TypeError('expected at 1 argument, got %d', len
(args))
        self.clear()
        self.update(*args, **kwds)

    def clear(self):
        self.__cached_sort = None
        self.__cnt = 0
        self.__order = {}
        dict.clear(self)

    def __setitem__(self, key, value):
        if key not in self:
            self.__cached_sort = None
            self.__cnt += 1
            self.__order[key] = self.__cnt
        dict.__setitem__(self, key, value)

    def __delitem__(self, key):
        if key in self:
            self.__cached_sort = None
            del self.__order[key]
        dict.__delitem__(self, key)

    def __sorted(self):
        # return keys in insertion order and cache the result
        if self.__cached_sort is None:
            self.__cached_sort = sorted(dict.keys(self),
                                        key=self.__order.__getitem__)
        return self.__cached_sort

    def __iter__(self):
        return iter(self.__sorted())

    def __reversed__(self):
        return iter(reversed(self.__sorted()))

    def popitem(self):
        # O(n) cost on the first pop and O(1) on successive pops
        if not self:
            raise KeyError
        key = self.__sorted().pop()
        del self.__order[key]
        value = dict.pop(self, key)
        return key, value

    # Methods with indirect access via the above methods

    setdefault = MutableMapping.setdefault
    update = MutableMapping.update
    pop = MutableMapping.pop
    keys = MutableMapping.keys
    values = MutableMapping.values
    items = MutableMapping.items

    def __repr__(self):
        return '{' + ', '.join(map('%r: %r'.__mod__, self.items())) +
'}'

    def copy(self):
        return self.__class__(self)

    @classmethod
    def fromkeys(cls, iterable, value=None):
        d = cls()
        for key in iterable:
            d[key] = value
        return d

    def __reduce__(self):
        # pickle an items list and any extra info in the instance dict
        items = list(self.items())
        inst_dict = vars(self).copy()
        for attr in vars(self.__class__):
            inst_dict.pop(attr, None)
        return (self.__class__, (items,), inst_dict)



From marduk at letterboxes.org  Thu Feb 26 18:58:18 2009
From: marduk at letterboxes.org (Albert Hopkins)
Date: Thu, 26 Feb 2009 18:58:18 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <1235692698.31574.17.camel@centar.nbk>

On Thu, 2009-02-26 at 13:48 -0800, Jesse Aldridge wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
>     foo = None
> 
> def get_foo():
>     return Foo.foo
> 
> if __name__ == "__main__":
>     import bar
>     Foo.foo = "foo"
>     bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
> 
> def go():
>     assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails.  Why?

AFAICT you have 2 different "foo" modules here. The first foo is when
foo.py is called as a script, but it's not called "foo" it's called
"__main__" because it's called as a script.  When "bar" is imported, it
imports "foo", but this is different. Technically this is the first time
you are *importing* foo. It's actually loaded a second time with the
name "foo".

A more simplified version of it is this:

$ cat foo.py 
cat = 6
import bar
print '%s: %s.cat = %s' % (__file__, __name__, cat)

$ cat bar.py 
import foo
foo.cat = 7
print '%s: %s.cat = %s' % (__file__, foo.__name__, foo.cat)

$ python foo.py 
/home/marduk/test/foo.py: foo.cat = 6
/home/marduk/test/bar.py: foo.cat = 7
foo.py: __main__.cat = 6


OTOH:
$ python -c "import foo"
bar.py: foo.cat = 7
foo.py: foo.cat = 7

But, as others have said, this is confusing and should be avoided.

-a




From http  Thu Feb 26 19:05:35 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 16:05:35 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
Message-ID: <7x63iwg2wg.fsf@ruckus.brouhaha.com>

Raymond Hettinger <python at rcn.com> writes:
> > What about using a second dictionary 
> My first attempt used exactly that approach and it works fine
> though it does complicate the code quite a bit and slows down
> all of the common operations by a constant factor.

Ehh, I guess I'm not surprised at the slowdown and extra complexity
from the second dict.  Oh well.  If the module really turns out to be
really used a lot, another (messy) approach would be to write a C
extension that uses a doubly linked list some day.


From peter at www.pjb.com.au  Thu Feb 26 19:08:26 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 27 Feb 2009 00:08:26 GMT
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <slrngqebnr.3ru.peter@box8.pjb.com.au>

On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance: > L=['a', 'b', 'c', 'a']
> I want to delete all 'a's from the list.  > But if L.remove('a')
> only deletes the first 'a'.  How do you delete all 'a's?

L2 = list(set(L))

works for me...
Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From rhodri at wildebst.demon.co.uk  Thu Feb 26 19:10:49 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 27 Feb 2009 00:10:49 -0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<7d37e241-cf2a-494d-96e9-5f2dbf6f6125@k9g2000prh.googlegroups.com>
Message-ID: <op.upzhgby4a8ncjz@gnudebst>

On Thu, 26 Feb 2009 23:10:20 -0000, Jonathan Gardner  
<jgardner at jonathangardner.net> wrote:

[snip]

> For each iteration, you take each surviving walker and spawn a new
> walker that takes a step in each possible direction. Then you check if
> any of those walkers found the value you are looking for. If so,
> you've found the answer. If they hit a value you've already seen, you
> drop that walker from the set.

This relies each value having the same set of next states no matter how
it's reached.  Unfortunately that's not true.  Consider what happens
when you walk on from (1+3) and (2+2):

One possible step from (1+3) is ((1/3)+3) == 3.33...  There's no single
step from (2+2) that can get you to the same place.

> The only hanging point is parentheses. What you can do here is instead
> of building a linear expression, build a tree expression that shows
> the operations and the values they operate. It should be trivial to
> calculate all the different new trees that are one digit longer than a
> previous tree.

Trivial yes, but the number of different new trees is large when you're
dealing with four digits, and ridiculous with 5.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From google at mrabarnett.plus.com  Thu Feb 26 19:11:43 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 27 Feb 2009 00:11:43 +0000
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <49A72FBF.8080206@mrabarnett.plus.com>

Trip Technician wrote:
> anyone interested in looking at the following problem.
> 
> we are trying to express numbers as minimal expressions using only the
> digits one two and three, with conventional arithmetic. so for
> instance
> 
> 33 = 2^(3+2)+1 = 3^3+(3*2)
> 
> are both minimal, using 4 digits but
> 
> 33 = ((3+2)*2+1)*3
> 
> using 5 is not.
> 
> I have tried coding a function to return the minimal representation
> for any integer, but haven't cracked it so far. The naive first
> attempt is to generate lots of random strings, eval() them and sort by
> size and value. this is inelegant and slow.
> 
> I have a dim intuition that it could be done with a very clever bit of
> recursion, but the exact form so far eludes me.
> 
Here's my solution (I haven't bothered with making it efficient, BTW):

import operator

def solve(n):
     best_len = n
     best_expr = ""
     for x in range(1, n - 2):
         for y in range(x, n):
             for op, name in operator_list:
                 # Does this pair with this op give the right answer?
                 if op(x, y) == n:
                     lx, ex = numbers[x - 1]
                     ly, ey = numbers[y - 1]
                     # How many digits in total?
                     l = lx + ly
                     # Fewer digits than any previous attempts?
                     if l < best_len:
                         # Build the expression.
                         e = "(%s %s %s)" % (ex, name, ey)
                         best_len, best_expr = l, e
     return best_len, best_expr

operator_list = [(operator.add, "+"), (operator.sub, "-"), 
(operator.mul, "*"), (operator.div, "/"), (operator.pow, "^")]

# Tuples contain number of digits used and expression.
numbers = [(1, str(n)) for n in range(1, 4)]

for n in range(4, 34):
     numbers.append(solve(n))

for i, (l, e) in enumerate(numbers):
     print "%2d = %s" % (i + 1, e)



From clp2 at rebertia.com  Thu Feb 26 19:18:18 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:18:18 -0800
Subject: Delete all items in the list
In-Reply-To: <slrngqebnr.3ru.peter@box8.pjb.com.au>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au> wrote:
> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>> only deletes the first 'a'. ?How do you delete all 'a's?
>
> L2 = list(set(L))
>
> works for me...

A. That doesn't by itself remove all the 'a's, although it does remove
all but 1 'a'
B. That also removes all but one instance of *everything* in the list,
not just 'a'
C. That is lossy in that it completely loses the ordering of the original list

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From xahlee at gmail.com  Thu Feb 26 19:22:57 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 16:22:57 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com> 
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com> 
	<87k57dwmay.fsf@thinkpad.tsdh.de>
Message-ID: <ba7c96e0-f245-48ba-b5e4-5a38ee393344@k19g2000prh.googlegroups.com>

On Feb 26, 1:59 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Xah Lee <xah... at gmail.com> writes:
>
> Hi Xah,
>
> > is the suggestion of using modern standard shortcut set of X C V for
> > Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> > fancy Notepad clone?
>
> The functionality stays the same, but IMO it would confuse most users.
> Killing is not cutting, yanking is not pasting.  The whole concepts
> (kill-ring vs. simple copy&paste) are much different.

emacs's killing/yaning/kill-ring is basically the same idea as copy/
cut/paste-board.

Basically, emacs's pasteboard is just a extended version, such that it
keeps a record of previous copied contents. To users, effectively,
this means you can do paste-previous. That's all there is to it.

So, it's brainless to make emacs intuitive to people and adopt modern
UI standards. Basically, copy, cut, paste, is all the same, except in
emacs you have also paste previous.

> > Is fixing emacs's confusing undo and no redo, that is periodically
> > bitched by programer in blogs, considered making emacs into a Notepad
> > clone?
>
> It's much more advanced than the usual sequential undo, but I admit that
> it can get confusing sometimes.  So instead of dropping it I'd prefer to
> think about a better UI for it.
>
> > Is the suggestion for a statistics based ergonomic keybinding design
> > that are more faster to execute, easier on the fingers, and easier to
> > remember, mean it is turning emacs to a fancy notepad clone?
>
> Users use different commands and your bindings may be better for you on
> your querty keyboard, but I'm sure they're not on my German Dvorak Type
> II keyboard.

If your are on a special keyboard, you are on your own.

The ergonomic keybinding

? Ergoemacs Keybindings
  http://xahlee.org/emacs/ergonomic_emacs_keybinding.html

plays well with modern UI in Windows, Mac, Linux. It improves emacs
keybinding, but also support standard shortcut sets. In no way, it
loses any emacs advantage, while, it makes emacs compatible and
intuitive for vast majority of computer users, and improve efficiency
for those heavy touch typists and programers who are into the concept
of not leaving hands off the keyboard.

> > is the suggestion of getting rid of *scratch* buffer, and introduce a
> > command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> > anywhere, which lets user create multiple scratch buffers defaulting
> > to any mode and compatible for the rest of Linux's shortcuts, means it
> > is a fancy Microsoft Notepad?
>
> Such a easy key like C-n is much too valuable for such a rarely used
> command.  C-x b foobar RET is ok, isn't it?

This issues is discussed before in some hundred or 2 hundred thread in
2008.

the proposal in detail is here:

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

In no way it sacrifices emacs operational efficiency. The proposal is
careful thought out, so that in not only doesn't sacrifice emacs
operational efficient in any possible way, but improve it, yet
meanwhile makes it compatible with modern UI and intuitive to the
masses.

As for the Ctrl+n for New, it must be used in conjunction with the
ergonomic keybinding set mentioned above.

In the end, users can intuitive press Ctrl+n for creating a new file,
one or multiple of it, can be used as elisp *scratch*, and can be set
to default to any major mode, and can be saved by simply pressing Ctrl
+s, and it will ask if user wants to save instead of like emacs
*scratch* it risk losing data.

> > is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> > +, such that it reflects the lable on the keyboard, and Richard
> > Stallman agrees may be a good idea, means it's Notepad?
>
> Nope, but I'm not sure if it's possible for emacs to get the right key.
> Here, M is Alt, but Ctrl is indeed on the CapsLock key...
>
> And it makes key sequences much longer to write with little or no
> benefit.

What the fuck r u talking about?? Really, what the fuck are you
talking about? Give concrete, specific point please.

As for the CapsLock for Control, it's a industry myth. For detail,
see:

? Why You Should Not Swap Caps Lock With Control
  http://xahlee.org/emacs/swap_CapsLock_Ctrl.html

> > is the suggestion of supporting html mail, and interface to gmail out
> > of the box, means it's becoming Microsoft Notepad?
>
> Definitively not.  AFAIK Gnus can handle gmail accounts quite well.

Quite well my ass.

Thank you for your feedback. I think it would be nice if you do some
research on each particular issue. I can't spend my time to write
detailed things to teach every poster. And i often have to repeat
multiple times of the same issue. For example of a research, suppose
you find my claim about Ctrl and Caps Lock switch incredible. Then,
you can do research on this subject. Spending 1 hour on it, or days.
You can go to library to research ergonomics, or ask professors, or
try to hire experts for opinion, or set out experiments and test out
hypothesis etc. For example, you can write a program to statistically
log your keystroke, timing, etc. You can also set out key sequences
set, A, and B, and type them for one hour each, to see which is
causing your hand pain, etc.

The above is just beginner suggestions, on one particular example of
contention. On each and every issue, you can start a research.

Btw, you are prob a typical tech geekers, where you don't understand
nothing about research or social sciences. One short concrete advice i
can give about your situation when researching, is not based on your
views on slashdot, or the tech geeking blogs, or ?my emacs buddies did
this or that? type of thinking. Another concrete advices is that
whatever you did for the research, must cost you. If it came easily
without much cost, chances are, it's bullshit in your head. What dose
cost mean? Ok, it means your time, for example. Are you, willing, to
put aside say 10 hours of your time, on a issue mentioned here?
Alternatively, say, are you willing, to spend $100 USD for research on
particular issue we are debating here? For example, the money can be
used to pay professional services that does research for you. It's
probably peanuts and most such research services won't take. But it's
a start on thinking. You can spend it on someone who are known expert
for example. As a quick example, say you disbelieve one of my claim
about ergonomics, then you can spend the $100 USD to say ask some
known ergonomics expert to dinner or buy him beer, and ask about his
opinion.

I typed the above as fast as i can, just to give you some ideas. There
are too many issues, aspects, technical, social, concrete,
philosophical, that i can cover, and have written a lot in the past
years. I can't repeat them all here, and frankly i discussed only a
small part. But i hope you have some basic ideas about the issue.

Love & knowledge,

  Xah
? http://xahlee.org/

?


From peter at www.pjb.com.au  Thu Feb 26 19:26:30 2009
From: peter at www.pjb.com.au (Peter Billam)
Date: 27 Feb 2009 00:26:30 GMT
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<mailman.860.1235693901.11746.python-list@python.org>
Message-ID: <slrngqecpn.3uk.peter@box8.pjb.com.au>

On 2009-02-27, Chris Rebert <clp2 at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au> wrote:
>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>> How do you delete all 'a's?
>>
>> L2 = list(set(L))
>> works for me...
>
> A. That doesn't by itself remove all the 'a's, although it does
> remove all but 1 'a'
> B. That also removes all but one instance of *everything* in the
> list, not just 'a'
> C. That is lossy in that it completely loses the ordering of the
> original list

Sorry, points taken...

Regards,  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From gagsl-py2 at yahoo.com.ar  Thu Feb 26 19:27:26 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 22:27:26 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <op.upzh70oux6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 22:08:26 -0200, Peter Billam <peter at www.pjb.com.au>  
escribi?:

> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list.  > But if L.remove('a')
>> only deletes the first 'a'.  How do you delete all 'a's?
>
> L2 = list(set(L))
>
> works for me...

For a very strange definition of "works":

py> L = ['a','b','c','a','j','b','z','b','a']
py> L2
['a', 'c', 'b', 'z', 'j']
py> L2 = list(set(L))
py> L2
['a', 'c', 'b', 'z', 'j']

I still see an 'a', there are things missing, and the order is totally  
lost.

-- 
Gabriel Genellina



From xahlee at gmail.com  Thu Feb 26 19:29:06 2009
From: xahlee at gmail.com (Xah Lee)
Date: Thu, 26 Feb 2009 16:29:06 -0800 (PST)
Subject: a look at the browser scene & emacs
References: <8358de80-5198-41e5-b4a2-04e681d359d1@p20g2000yqi.googlegroups.com>
	<86wsbeajz6.fsf@lola.quinscape.zz>
	<mailman.1758.1235567636.31690.help-gnu-emacs@gnu.org> 
	<go3gu9$1d7$1@rileyrgdev.motzarella.org>
	<buohc2h378v.fsf@dhlpc061.dev.necel.com> 
	<002094c7-f9fd-422e-a68f-67051e0c7483@w9g2000yqa.googlegroups.com> 
	<87k57dwmay.fsf@thinkpad.tsdh.de> <go5qmt$a7e$1@news.sap-ag.de> 
	<mailman.1849.1235647425.31690.help-gnu-emacs@gnu.org>
Message-ID: <4b5e5587-39c4-43a5-b28c-739eea8605af@d19g2000prh.googlegroups.com>

On Feb 26, 1:59 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Xah Lee <xah... at gmail.com> writes:
>
> Hi Xah,
>
> > is the suggestion of using modern standard shortcut set of X C V for
> > Cut, Copy, Paste, of which Linux uses, means it is turning emacs to a
> > fancy Notepad clone?
>
> The functionality stays the same, but IMO it would confuse most users.
> Killing is not cutting, yanking is not pasting.  The whole concepts
> (kill-ring vs. simple copy&paste) are much different.

emacs's killing/yaning/kill-ring is basically the same idea as copy/
cut/paste-board.

Basically, emacs's pasteboard is just a extended version, such that it
keeps a record of previous copied contents. To users, effectively,
this means you can do paste-previous. That's all there is to it.

So, it's brainless to make emacs intuitive to people and adopt modern
UI standards. Basically, copy, cut, paste, is all the same, except in
emacs you have also paste previous.

> > Is fixing emacs's confusing undo and no redo, that is periodically
> > bitched by programer in blogs, considered making emacs into a Notepad
> > clone?
>
> It's much more advanced than the usual sequential undo, but I admit that
> it can get confusing sometimes.  So instead of dropping it I'd prefer to
> think about a better UI for it.
>
> > Is the suggestion for a statistics based ergonomic keybinding design
> > that are more faster to execute, easier on the fingers, and easier to
> > remember, mean it is turning emacs to a fancy notepad clone?
>
> Users use different commands and your bindings may be better for you on
> your querty keyboard, but I'm sure they're not on my German Dvorak Type
> II keyboard.

If your are on a special keyboard, you are on your own.

The ergonomic keybinding

? Ergoemacs Keybindings
  http://xahlee.org/emacs/ergonomic_emacs_keybinding.html

plays well with modern UI in Windows, Mac, Linux. It improves emacs
keybinding, but also support standard shortcut sets. In no way, it
loses any emacs advantage, while, it makes emacs compatible and
intuitive for vast majority of computer users, and improve efficiency
for those heavy touch typists and programers who are into the concept
of not leaving hands off the keyboard.

> > is the suggestion of getting rid of *scratch* buffer, and introduce a
> > command ?New? with shortcut Ctrl+n, that creates new buffer anytime
> > anywhere, which lets user create multiple scratch buffers defaulting
> > to any mode and compatible for the rest of Linux's shortcuts, means it
> > is a fancy Microsoft Notepad?
>
> Such a easy key like C-n is much too valuable for such a rarely used
> command.  C-x b foobar RET is ok, isn't it?

This issues is discussed before in some hundred or 2 hundred thread in
2008.

the proposal in detail is here:

? Suggestions on Emacs's Scratch Buffer
  http://xahlee.org/emacs/modernization_scratch_buffer.html

In no way it sacrifices emacs operational efficiency. The proposal is
careful thought out, so that in not only doesn't sacrifice emacs
operational efficient in any possible way, but improve it, yet
meanwhile makes it compatible with modern UI and intuitive to the
masses.

As for the Ctrl+n for New, it must be used in conjunction with the
ergonomic keybinding set mentioned above.

In the end, users can intuitive press Ctrl+n for creating a new file,
one or multiple of it, can be used as elisp *scratch*, and can be set
to default to any major mode, and can be saved by simply pressing Ctrl
+s, and it will ask if user wants to save instead of like emacs
*scratch* it risk losing data.

> > is the suggestion of changing notation from C- and M- to Ctrl+ and Alt
> > +, such that it reflects the lable on the keyboard, and Richard
> > Stallman agrees may be a good idea, means it's Notepad?
>
> Nope, but I'm not sure if it's possible for emacs to get the right key.
> Here, M is Alt, but Ctrl is indeed on the CapsLock key...
>
> And it makes key sequences much longer to write with little or no
> benefit.

What the fuck r u talking about?? Really, what the fuck are you
talking about? Give concrete, specific point please.

As for the CapsLock for Control, it's a industry myth. For detail,
see:

? Why You Should Not Swap Caps Lock With Control
  http://xahlee.org/emacs/swap_CapsLock_Ctrl.html

> > is the suggestion of supporting html mail, and interface to gmail out
> > of the box, means it's becoming Microsoft Notepad?
>
> Definitively not.  AFAIK Gnus can handle gmail accounts quite well.

Quite well my ass.

Thank you for your feedback. I think it would be nice if you do some
research on each particular issue. I can't spend my time to write
detailed things to teach every poster. And i often have to repeat
multiple times of the same issue. For example of a research, suppose
you find my claim about Ctrl and Caps Lock switch incredible. Then,
you can do research on this subject. Spending 1 hour on it, or days.
You can go to library to research ergonomics, or ask professors, or
try to hire experts for opinion, or set out experiments and test out
hypothesis etc. For example, you can write a program to statistically
log your keystroke, timing, etc. You can also set out key sequences
set, A, and B, and type them for one hour each, to see which is
causing your hand pain, etc.

The above is just beginner suggestions, on one particular example of
contention. On each and every issue, you can start a research.

Btw, you are prob a typical tech geekers, where you don't understand
nothing about research or social sciences. One short concrete advice i
can give about your situation when researching, is not based on your
views on slashdot, or the tech geeking blogs, or ?my emacs buddies did
this or that? type of thinking. Another concrete advices is that
whatever you did for the research, must cost you. If it came easily
without much cost, chances are, it's bullshit in your head. What dose
cost mean? Ok, it means your time, for example. Are you, willing, to
put aside say 10 hours of your time, on a issue mentioned here?
Alternatively, say, are you willing, to spend $100 USD for research on
particular issue we are debating here? For example, the money can be
used to pay professional services that does research for you. It's
probably peanuts and most such research services won't take. But it's
a start on thinking. You can spend it on someone who are known expert
for example. As a quick example, say you disbelieve one of my claim
about ergonomics, then you can spend the $100 USD to say ask some
known ergonomics expert to dinner or buy him beer, and ask about his
opinion.

I typed the above as fast as i can, just to give you some ideas. There
are too many issues, aspects, technical, social, concrete,
philosophical, that i can cover, and have written a lot in the past
years. I can't repeat them all here, and frankly i discussed only a
small part. But i hope you have some basic ideas about the issue.

Love & knowledge,

  Xah
? http://xahlee.org/

?

---------------------------


On Feb 26, 3:23 am, Tassilo Horn <tass... at member.fsf.org> wrote:
> Klaus Straubinger <KSN... at UseNet.ArcorNews.DE> writes:
>
> Hi Klaus,
>
> >> Reading HTML mail works nice, too (with emacs-w3m as helper).  A
> >> simple editor would be nice for some people, too.  But I guess that
> >> most current devs arent interested in writing one, cause in "the tech
> >> geekers" world mail is in text/plain.
>
> > In Emacs, there is Enriched Mode if you want formatted text. The info
> > file says
>
> > | "Enriched mode" is a minor mode for editing files that contain
> > | formatted text in WYSIWYG fashion, as in a word processor.  Currently,
> > | formatted text in Enriched mode can specify fonts, colors, underlining,
> > | margins, and types of filling and justification.  In the future, we plan
> > | to implement other formatting features as well.
> > |
> > | Enriched mode is a minor mode.  It is typically used in conjunction
> > | with Text mode, but you can also use it with other major modes such
> > | as Outline mode and Paragraph-Indent Text mode.
> > |
> > | Potentially, Emacs can store formatted text files in various file
> > | formats.  Currently, only one format is implemented: "text/enriched"
> > | format, which is defined by the MIME protocol.
>
> > One could write a converter to HTML if another format is desired.
>
> Yes, nice.  I guess that would be possible without too much effort.  So
> Xah, why not do it yourself?

Me?

I started a project in Jan, called emacs2010. Here:

http://code.google.com/p/emacs2010/

You see, one of the things tech geekers do, is to throw piss around.
So, instead of telling me something and something and something, for a
change, why don't you join my project and contribute code, for the
good of humanity? It's GPL, btw.

With your approval, i'll add you as a member.

  Xah
? http://xahlee.org/

?


From steve at holdenweb.com  Thu Feb 26 19:29:56 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:29:56 -0500
Subject: Delete all items in the list
In-Reply-To: <slrngqebnr.3ru.peter@box8.pjb.com.au>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
Message-ID: <go7c79$bc6$1@ger.gmane.org>

Peter Billam wrote:
> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance: > L=['a', 'b', 'c', 'a']
>> I want to delete all 'a's from the list.  > But if L.remove('a')
>> only deletes the first 'a'.  How do you delete all 'a's?
> 
> L2 = list(set(L))
> 
> works for me...

I have to wonder for what value of "works" this works.

The simplest problem is it doesn't remove all the "a"s.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From lilhedges69 at yahoo.com  Thu Feb 26 19:32:40 2009
From: lilhedges69 at yahoo.com (Brett Hedges)
Date: Thu, 26 Feb 2009 16:32:40 -0800 (PST)
Subject: Using xreadlines
Message-ID: <910645.78379.qm@web30707.mail.mud.yahoo.com>


Hi,

I am using both xreadlines and files iterators for a script that I need to finish. I am iterating over the entire file but stopping to use xreadlines to grab certain lines as strings to process them.

My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.

My script has a loop that looks for a certain word then breaks the loop. But I need to go to the previous line before I break since the script uses that line (which gets processed). I'm sure there is an easier way to do this but since I am new to python and have spent a lot of time on this script I can't really go back and change a lot of things unless there is no possible way. Something like the example below.

f.open("text.txt",'r')
files = f.xreadlines()
Name = "Section 1"


for line in f:
   if Name in line:
     while x<20
       field = files.next()
         if "2.6" in field:
      *****files.previousline()*****
           break
     x=x+1




Thanks,

Brett 


      


From gagsl-py2 at yahoo.com.ar  Thu Feb 26 19:37:06 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 26 Feb 2009 22:37:06 -0200
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>
Message-ID: <op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>

En Thu, 26 Feb 2009 22:18:18 -0200, Chris Rebert <clp2 at rebertia.com>  
escribi?:
> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au>  
> wrote:
>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>> Hi. This must be a simple command but I just can't find it in the
>>> Phthon manual. How do I delete all items with a certain condition from
>>> a list? For instance: > L=['a', 'b', 'c', 'a']
>>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>>> only deletes the first 'a'. ?How do you delete all 'a's?
>>
>> L2 = list(set(L))
>>
>> works for me...
>
> A. That doesn't by itself remove all the 'a's, although it does remove
> all but 1 'a'
> B. That also removes all but one instance of *everything* in the list,
> not just 'a'
> C. That is lossy in that it completely loses the ordering of the  
> original list

I said the very same things!
There are other issues too, like this only works with hashable objects,  
but I've chosen exactly the same remarks and exactly in the same order!  
What a coincidence...

-- 
Gabriel Genellina



From steve at holdenweb.com  Thu Feb 26 19:37:49 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:37:49 -0500
Subject: Can someone explain this behavior to me?
In-Reply-To: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
Message-ID: <go7cm2$e1v$1@ger.gmane.org>

Jesse Aldridge wrote:
> I have one module called foo.py
> ---------------------
> class Foo:
>     foo = None
> 
> def get_foo():
>     return Foo.foo
> 
> if __name__ == "__main__":
>     import bar
>     Foo.foo = "foo"
>     bar.go()
> ---------------------
> And another one called bar.py
> ---------------------
> import foo
> 
> def go():
>     assert foo.get_foo() == "foo"
> ----------------------
> When I run foo.py, the assertion in bar.py fails.  Why?

There are actually two get_foo()s, since foo.py is run (giving it the
name "__main__") and imported (giving it the name "foo"). You will
probably find that __main__.get_foo() == "foo".

regards
 Steve

-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 19:39:50 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:39:50 -0800
Subject: Delete all items in the list
In-Reply-To: <op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<slrngqebnr.3ru.peter@box8.pjb.com.au>
	<50697b2c0902261618j56905e0as1c3c2a1cf00eb995@mail.gmail.com>
	<op.upzin4kvx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <50697b2c0902261639w42574390jab7191bf1ca8ccc8@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:37 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Thu, 26 Feb 2009 22:18:18 -0200, Chris Rebert <clp2 at rebertia.com>
> escribi?:
>>
>> On Thu, Feb 26, 2009 at 4:08 PM, Peter Billam <peter at www.pjb.com.au>
>> wrote:
>>>
>>> On 2009-02-26, Clarendon <jineu21 at hotmail.com> wrote:
>>>>
>>>> Hi. This must be a simple command but I just can't find it in the
>>>> Phthon manual. How do I delete all items with a certain condition from
>>>> a list? For instance: > L=['a', 'b', 'c', 'a']
>>>> I want to delete all 'a's from the list. ?> But if L.remove('a')
>>>> only deletes the first 'a'. ?How do you delete all 'a's?
>>>
>>> L2 = list(set(L))
>>>
>>> works for me...
>>
>> A. That doesn't by itself remove all the 'a's, although it does remove
>> all but 1 'a'
>> B. That also removes all but one instance of *everything* in the list,
>> not just 'a'
>> C. That is lossy in that it completely loses the ordering of the original
>> list
>
> I said the very same things!
> There are other issues too, like this only works with hashable objects, but
> I've chosen exactly the same remarks and exactly in the same order! What a
> coincidence...

Indeed, USENET and mail<->news lags doth create interesting situations
sometimes.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From steve at holdenweb.com  Thu Feb 26 19:40:11 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 19:40:11 -0500
Subject: PythonWin -vs- Idle
In-Reply-To: <50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com>
Message-ID: <go7cqg$e1v$2@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gschells at hotmail.com> wrote:
>> Hello,
>> Python newbie here.  I am working with Python and geoprocessing in ArcGIS.
>> I'm taking a training course online and the exercise I'm working on makes
>> mention of using PythonWin instead of Idle.
>>
>> I am using version 2.5 and have not been able to locate PythonWin.  The
>> download just includes Idle for the environment.  Can anyone point me in the
>> right direction to download the PythonWin piece of this puzzle?
> 
> Seems to be included in http://sourceforge.net/projects/pywin32/
> 
And it's well worth getting, since it's the recommended programming
environment for ArcGIS. IIRC it uses the COM server capabilities to
achieve some of the required magic.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 19:46:22 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 16:46:22 -0800
Subject: Using xreadlines
In-Reply-To: <910645.78379.qm@web30707.mail.mud.yahoo.com>
References: <910645.78379.qm@web30707.mail.mud.yahoo.com>
Message-ID: <50697b2c0902261646q3192cad3j1cdab7084a177e2f@mail.gmail.com>

On Thu, Feb 26, 2009 at 4:32 PM, Brett Hedges <lilhedges69 at yahoo.com> wrote:
>
> Hi,
>
> I am using both xreadlines and files iterators for a script that I need to finish. I am iterating over the entire file but stopping to use xreadlines to grab certain lines as strings to process them.
>
> My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.
>
> My script has a loop that looks for a certain word then breaks the loop. But I need to go to the previous line before I break since the script uses that line (which gets processed). I'm sure there is an easier way to do this but since I am new to python and have spent a lot of time on this script I can't really go back and change a lot of things unless there is no possible way. Something like the example below.
>
> f.open("text.txt",'r')
> files = f.xreadlines()
> Name = "Section 1"
>
>
prev_line = None
> for line in f:
>   if Name in line:
>     while x<20
>       field = files.next()
>         if "2.6" in field:
            use(prev_line)
>      *****files.previousline()*****
>           break
    prev_line = line
>     x=x+1

Also, you could probably make the loop prettier by using enumerate()
or range() to track `x`.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bearophileHUGS at lycos.com  Thu Feb 26 20:09:22 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Thu, 26 Feb 2009 17:09:22 -0800 (PST)
Subject: Using xreadlines
References: <mailman.865.1235695165.11746.python-list@python.org>
Message-ID: <82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>

Brett Hedges:
> My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.<

In modern versions of Python you usually don't need xreadlines,
because files are iterable.

If your files are small, you can just read all the lines in a list
with open(...).readlines(), and then just use the item of the list
with the n-1 index.

If the file is quite large or you like to keep things lazy, then you
have to keep memory of the previous line, using an auxiliary variable.
You can also wrap this idiom into a generator function (or iterable
class, probably) that yields items and keeps memory of the last one
(but you can't ask the previous of the first item, of course).

You can also keep track of the absolute position of the lines in the
file, etc, or step back looking for newlines, etc, but it's not handy.

Bye,
bearophile


From cto at openmigration.net  Thu Feb 26 20:57:43 2009
From: cto at openmigration.net (geremy condra)
Date: Thu, 26 Feb 2009 20:57:43 -0500
Subject: code challenge: generate minimal expressions using only digits 
	1,2,3
In-Reply-To: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
Message-ID: <f3cc57c60902261757j983c1b1wbf3e405391c8d9b9@mail.gmail.com>

Use 1 and 2 and treat them as equivalent to boolean true and false.
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From astan.chee at al.com.au  Thu Feb 26 21:06:47 2009
From: astan.chee at al.com.au (Astan Chee)
Date: Fri, 27 Feb 2009 13:06:47 +1100
Subject: factoring wx.Image
Message-ID: <49A74AB7.8010808@al.com.au>

Hi,
I want to factor (red, green and blue at the same time) an image using 
wx but without any GUI display or windows but it keeps crashing and if I 
set the checks to ignore it, it doesn't produce the images at all.
It looks like this:

import wx
img = wx.Image("star.jpg",wx.BITMAP_TYPE_BMP)
factor = 1
for i in range(1,30):
    image = img.AdjustChannels(factor, factor, factor, 1)
    fname = "star." + str(factor) + ".jpg"
    img.SaveFile(fname,wx.BITMAP_TYPE_JPEG)
    factor+=1

What am I missing here? What am I doing wrong? Can this even be done 
with only wx?
Thanks for any help.
Cheers
Astan



From mail at anjanesh.net  Thu Feb 26 22:11:18 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 08:41:18 +0530
Subject: Multiple conditional expression
Message-ID: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>

How do I achieve something like this using python ?
spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
: False : False)

spaces = True if form.getvalue('spaces') == 1 if
form.has_key('spaces') else False else False
-- 
Anjanesh Lekshmnarayanan


From steve at holdenweb.com  Thu Feb 26 22:14:50 2009
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 26 Feb 2009 22:14:50 -0500
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
Message-ID: <go7lsi$3db$1@ger.gmane.org>

Anjanesh Lekshminarayanan wrote:
> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
> : False : False)
> 
> spaces = True if form.getvalue('spaces') == 1 if
> form.has_key('spaces') else False else False

If you've got any sense at all, you don't. Write the logic so it makes
some sense to the casual reader. You will be that casual reader in a few
months.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Thu Feb 26 22:17:20 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 19:17:20 -0800
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
Message-ID: <50697b2c0902261917n14b2aa2dxdb173c2d8ddbe895@mail.gmail.com>

On Thu, Feb 26, 2009 at 7:11 PM, Anjanesh Lekshminarayanan
<mail at anjanesh.net> wrote:
> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True
> : False : False)
>
> spaces = True if form.getvalue('spaces') == 1 if
> form.has_key('spaces') else False else False

That seems to just be an overly complicated way of writing:

spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From grante at visi.com  Thu Feb 26 22:26:09 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 26 Feb 2009 21:26:09 -0600
Subject: Multiple conditional expression
References: <mailman.871.1235704281.11746.python-list@python.org>
Message-ID: <geqdnabuHqHMwDrUnZ2dnUVZ_jWWnZ2d@posted.usinternet>

On 2009-02-27, Anjanesh Lekshminarayanan <mail at anjanesh.net> wrote:

> How do I achieve something like this using python ?
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ? True : False : False)

   if form.has_key('spaces'):
      spaces = form.getvalue('spaces') == 1
   else:
      spaces = False

However, my code is not acheiving entirely the same thing as
your example code.  The object 'spaces' ends up with the same
value, but my code fails to acheive the other presumed
objective: confusing the reader.
   
-- 
Grant



From http  Thu Feb 26 22:34:29 2009
From: http (Paul Rubin)
Date: 26 Feb 2009 19:34:29 -0800
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
Message-ID: <7xhc2gv9h6.fsf@ruckus.brouhaha.com>

Chris Rebert <clp2 at rebertia.com> writes:
> spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

 spaces = form.has_key('spaces') and form.getvalue('spaces') == 1

or even (this is about the cgi module, I think)

 spaces = form.getvalue('spaces', None) == 1

But the == 1 comparison will always fail, since getvalue returns a string.


From mail at anjanesh.net  Thu Feb 26 22:51:30 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 09:21:30 +0530
Subject: UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in 
	position 10442: character maps to <undefined>
In-Reply-To: <loom.20090130T012214-679@post.gmane.org>
References: <1a7951080901290824p424caee3jb74b1343ce884916@mail.gmail.com>
	<ec96e1390901290849g507dcb17tf2372e573f4a5bb5@mail.gmail.com>
	<1a7951080901290909x4590d3c6m5d7d9c2185511ca6@mail.gmail.com>
	<ec96e1390901290921nd82a298s959338c52a28ba90@mail.gmail.com>
	<loom.20090129T200209-617@post.gmane.org>
	<ec96e1390901291358r1ba1a534iccb66c4fa642f832@mail.gmail.com>
	<loom.20090130T012214-679@post.gmane.org>
Message-ID: <1a7951080902261951j1fd72f38hf3a9af92ea9bc3bc@mail.gmail.com>

> (1) what is produced on Anjanesh's machine
>>> sys.getdefaultencoding()
'utf-8'

> (2) it looks like a small snippet from a Python source file!
Its a file containing just JSON data - but has some unicode characters
as well as it has data from the web.

> Anjanesh, Is it a .py file
Its a .json file. I have a bunch of these json files which Im parsing.
using json library.

> Instead of "something like", please report exactly what is there:
>
> print(ascii(open('the_file', 'rb').read()[10442-20:10442+21]))
>>> print(ascii(open('the_file', 'rb').read()[10442-20:10442+21]))
b'":42,"query":"0 1\xc2\xbb\xc3\x9d \\u2021 0\\u201a0 \\u2'

> Trouble with cases like this is as soon as they become interesting, the OP often
snatches somebody's one-liner that "works" (i.e. doesn't raise an exception),
makes a quick break for the county line, and they're not seen again :-)

Actually, I moved the files to my Ubuntu PC which has Python 2.5.2 and
didnt give the encoding issue. I just couldnt spend that much time on
why a couple of these files had encoding issues in Py3 since I had to
parse a whole lot of files.


From wuwei23 at gmail.com  Thu Feb 26 23:16:55 2009
From: wuwei23 at gmail.com (alex23)
Date: Thu, 26 Feb 2009 20:16:55 -0800 (PST)
Subject: PythonWin -vs- Idle
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<mailman.855.1235688054.11746.python-list@python.org>
Message-ID: <aa6b3753-e928-4c83-b414-f7b055263496@b38g2000prf.googlegroups.com>

On Feb 27, 8:40?am, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gsche... at hotmail.com> wrote:
> > I am using version 2.5 and have not been able to locate PythonWin.? The
> > download just includes Idle for the environment.? Can anyone point me in the
> > right direction to download the PythonWin piece of this puzzle?
>
> Seems to be included in http://sourceforge.net/projects/pywin32/

It's also bundled with ActiveState's ActivePython:

http://www.activestate.com/activepython/


From JesseAldridge at gmail.com  Thu Feb 26 23:30:38 2009
From: JesseAldridge at gmail.com (Jesse Aldridge)
Date: Thu, 26 Feb 2009 20:30:38 -0800 (PST)
Subject: Can someone explain this behavior to me?
References: <b3dd6e81-f3ef-498c-80eb-1ec03ca8695a@s38g2000prg.googlegroups.com>
	<mailman.864.1235695119.11746.python-list@python.org>
Message-ID: <d5338596-da48-4f57-a379-ffdd909fd012@r29g2000vbp.googlegroups.com>

Ah, I get it.
Thanks for clearing that up, guys.


From grante at visi.com  Thu Feb 26 23:33:24 2009
From: grante at visi.com (Grant Edwards)
Date: Thu, 26 Feb 2009 22:33:24 -0600
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
Message-ID: <f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>

On 2009-02-27, Paul Rubin <http> wrote:

> But the == 1 comparison will always fail, since getvalue returns a string.

How do we know that from the what the OP posted?

-- 
Grant



From mail at anjanesh.net  Thu Feb 26 23:39:39 2009
From: mail at anjanesh.net (Anjanesh Lekshminarayanan)
Date: Fri, 27 Feb 2009 10:09:39 +0530
Subject: Multiple conditional expression
In-Reply-To: <f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
Message-ID: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>

> How do we know that from the what the OP posted?
Its CGI alright.
spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'

But I just dont see how
spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
True: False : False)
is complicated in anyway. Its not that hard to read at all.

Thanks.


From dg.gmane at thesamovar.net  Thu Feb 26 23:49:08 2009
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Fri, 27 Feb 2009 05:49:08 +0100
Subject: code challenge: generate minimal expressions using only digits
	1,2,3
In-Reply-To: <49A72FBF.8080206@mrabarnett.plus.com>
References: <941be713-2789-48c7-911b-422313f232d5@o36g2000yqh.googlegroups.com>
	<49A72FBF.8080206@mrabarnett.plus.com>
Message-ID: <go7rc6$eli$1@ger.gmane.org>

MRAB wrote:
> Here's my solution (I haven't bothered with making it efficient, BTW):
> 
> import operator
> 
> def solve(n):
>     best_len = n
>     best_expr = ""
>     for x in range(1, n - 2):
>         for y in range(x, n):
>             for op, name in operator_list:
>                 # Does this pair with this op give the right answer?
>                 if op(x, y) == n:
>                     lx, ex = numbers[x - 1]
>                     ly, ey = numbers[y - 1]
>                     # How many digits in total?
>                     l = lx + ly
>                     # Fewer digits than any previous attempts?
>                     if l < best_len:
>                         # Build the expression.
>                         e = "(%s %s %s)" % (ex, name, ey)
>                         best_len, best_expr = l, e
>     return best_len, best_expr
> 
> operator_list = [(operator.add, "+"), (operator.sub, "-"), 
> (operator.mul, "*"), (operator.div, "/"), (operator.pow, "^")]
> 
> # Tuples contain number of digits used and expression.
> numbers = [(1, str(n)) for n in range(1, 4)]
> 
> for n in range(4, 34):
>     numbers.append(solve(n))
> 
> for i, (l, e) in enumerate(numbers):
>     print "%2d = %s" % (i + 1, e)

Sadly this doesn't work because you're assuming that the shortest 
expression always involves increasing the size of the numbers at every 
step. For example, your algorithm for 63 gives:

(3 * (3 * (1 + (2 * 3))))

which involves 4 operations, whereas the simplest is:

2**(2*3)-1

which only involves 3 (but has an intermediate value 2**6=64 above the 
target value).

Fixing this is actually pretty hard, because the search space becomes 
very large if you allow yourself arbitrarily large numbers. You can't do 
any obvious pruning that I can think of, because operations between very 
large numbers can end up very small (for example, 13**3-3**7=10 even 
though 13**3=2197 and 3**7=2187 are both very large), and the shortest 
path to a small number might go through very large numbers (I bet with a 
bit more thought than I have put into it, you could come up with some 
examples where the intermediate calculations are arbitrarily larger than 
the end result). As well as the growth of the search space, the 
computations get hairy too, try computing 3**3**3**3 for example (or 
better, don't, because it has 3638334640025 digits).

I haven't got a solution that can be guaranteed correct and is feasible 
to compute for anything but very small examples - anyone done better?

Dan



From benjamin at python.org  Thu Feb 26 23:49:54 2009
From: benjamin at python.org (Benjamin Peterson)
Date: Fri, 27 Feb 2009 04:49:54 +0000 (UTC)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
Message-ID: <loom.20090227T044929-209@post.gmane.org>

Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:

> f any one suggests better solution then i will be very happy.Advance thanks
for any help.Shan

Use a set.






From python at rcn.com  Thu Feb 26 23:54:40 2009
From: python at rcn.com (Raymond Hettinger)
Date: Thu, 26 Feb 2009 20:54:40 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
Message-ID: <6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>

[Paul Rubin]
> Ehh, I guess I'm not surprised at the slowdown and extra complexity
> from the second dict. ?Oh well. ?If the module really turns out to be
> really used a lot, another (messy) approach would be to write a C
> extension that uses a doubly linked list some day.

That seems like an ideal implementation to me.

  O(1): appending, popping, searching, and deletion
  O(n): traversal

Raymond


From clp2 at rebertia.com  Fri Feb 27 00:11:28 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 21:11:28 -0800
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>
	<mailman.873.1235704646.11746.python-list@python.org>
	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>
	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
	<1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
Message-ID: <50697b2c0902262111o4f566fd8r6d4a13f1fcd6c632@mail.gmail.com>

On Thu, Feb 26, 2009 at 8:39 PM, Anjanesh Lekshminarayanan
<mail at anjanesh.net> wrote:
>> How do we know that from the what the OP posted?
> Its CGI alright.
> spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'
>
> But I just dont see how
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
> True: False : False)
> is complicated in anyway. Its not that hard to read at all.

You have /nested/ /ternary/ expressions /without/ any disambiguating
parentheses. And you unnecessarily use boolean constants. The latter
and the stuff in italics is what makes your code hard to understand.

As I showed, you can write the *exact same thing* without using
ternary expressions at all (win!), much less nested ones, and without
any boolean constants.
And it's even 16 characters shorter.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From clp2 at rebertia.com  Fri Feb 27 00:15:39 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 21:15:39 -0800
Subject: removing duplication from a huge list.
In-Reply-To: <loom.20090227T044929-209@post.gmane.org>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
Message-ID: <50697b2c0902262115x37b098b2s908710fbc79529ec@mail.gmail.com>

On Thu, Feb 26, 2009 at 8:49 PM, Benjamin Peterson <benjamin at python.org> wrote:
> Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:
>
>> f any one suggests better solution then i will be very happy.Advance thanks
> for any help.Shan
>
> Use a set.

To expand on that a bit:

counted_recs = set(rec[0] for rec in some_fun())
#or in Python 3.0:
counted_recs = {rec[0] for rec in some_fun()}

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From venutaurus539 at gmail.com  Fri Feb 27 00:16:42 2009
From: venutaurus539 at gmail.com (venutaurus539 at gmail.com)
Date: Thu, 26 Feb 2009 21:16:42 -0800 (PST)
Subject: Run a python script as an exe and run a new process from it
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.834.1235672099.11746.python-list@python.org>
Message-ID: <e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>

On Feb 26, 11:14?pm, "Paddy O'Loughlin" <patrick.olough... at gmail.com>
wrote:
> Try this as an outline:
> #### script1.py
> from subprocess import Popen
>
> if __name__ == '__main__':
> ? ? ? ? scriptname = "script2.py"
>
> ? ? ? ? Popen("python %s" % scriptname, shell=True)
>
> ? ? ? ? print "I'm done"
>
> #### script2.py
> from time import sleep
>
> if __name__ == '__main__':
> ? ? while (True):
> ? ? ? ? print "waiting.."
> ? ? ? ? sleep(2)
>
> ###########################
> If you install python using the Windows Installer (.exe), it should
> set up .py files to be opened by python when double-clicking on them.
> Alternatively, you can right-click on your .py file and go to "Open
> With..." then "choose program", then click "Browse...", you can Browse
> to the python executable, so Explorer will use it to open .py files
> when you double-click on them.
>
> As someone else mentioned there is also a py2exe program. Google it.
>
> 2009/2/26 venutaurus... at gmail.com <venutaurus... at gmail.com>:
>
>
>
> > Hello all,
> > ? ? ? ? ? I've a strange requirement where I need to run a python
> > script just as we run an exe (by double clicking through windows
> > explorer or by typing the script name at command prompt). In that
> > process I should be able to execute another python script in such a
> > way that, the second script should continue running but the main one
> > should terminate without effecting the second one.
>
> > ? ? ? ? ? ? ? ? ? ?My requirement may be little confusing so please
> > get back if you didn't understand what I meant above.
>
> > Thank you,
> > Venu.
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
> --
> "Ray, when someone asks you if you're a god, you say YES!"

Thanks for the reply,,
            I am trying to use the above application using psexec()in
command line.But it failed returning the error message

 exited with error code 255.

              But when I ran the application normally it worked
fine.Do I need to add anything to my python script(either the main one
or the script which is calling it) to make it work.

Thank you,
Venu Madhav.


From tarundevnani at gmail.com  Fri Feb 27 00:47:44 2009
From: tarundevnani at gmail.com (tarun)
Date: Fri, 27 Feb 2009 11:17:44 +0530
Subject: Killing Child Process
Message-ID: <c88245360902262147j534def4ag2c1e59d94e946728@mail.gmail.com>

Hello Group,

I've spwaned a process using os.spwanl. As part of this process, I spwan one
more process, using subprocess.Popen.
After I close the the process spwaned using os.spwanl, the child process
started by it using subprocess.Popen, doesn't get closed.
Is there any way to do this in python 2.5.1?

Thanks,
Tarun
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From odeits at gmail.com  Fri Feb 27 01:17:58 2009
From: odeits at gmail.com (odeits)
Date: Thu, 26 Feb 2009 22:17:58 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
Message-ID: <b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>

On Feb 26, 9:15?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Feb 26, 2009 at 8:49 PM, Benjamin Peterson <benja... at python.org> wrote:
> > Shanmuga Rajan <m.shanmugarajan <at> gmail.com> writes:
>
> >> f any one suggests better solution then i will be very happy.Advance thanks
> > for any help.Shan
>
> > Use a set.
>
> To expand on that a bit:
>
> counted_recs = set(rec[0] for rec in some_fun())
> #or in Python 3.0:
> counted_recs = {rec[0] for rec in some_fun()}
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

How big of a list are we talking about? If the list is so big that the
entire list cannot fit in memory at the same time this approach wont
work e.g. removing duplicate lines from a very large file. A couple of
things come into play at that point. If order does not matter then I
would suggest looking at some recipes for first sorting the large file
and then iterating through the lines removing duplicates as you go
( if cur_line != last_line: write cur_line; last_line = cur_line )

If order does matter then let me know and I will post a recipe for
that.


From niklas.norrthon at hotmail.com  Fri Feb 27 01:23:10 2009
From: niklas.norrthon at hotmail.com (Niklas Norrthon)
Date: Thu, 26 Feb 2009 22:23:10 -0800 (PST)
Subject: PythonWin -vs- Idle
References: <COL107-W246885A4ADEC1589F8FF35C6AD0@phx.gbl>
	<50697b2c0902261440ja1db6a0i3512527eb835d9b@mail.gmail.com> 
	<mailman.867.1235695508.11746.python-list@python.org>
Message-ID: <6eb932a4-74d3-4925-9c78-6cc8ae957e02@a39g2000yqc.googlegroups.com>

On 27 Feb, 01:40, Steve Holden <st... at holdenweb.com> wrote:
> Chris Rebert wrote:
> > On Thu, Feb 26, 2009 at 2:23 PM, Gary Schells <gsche... at hotmail.com> wrote:
> >> Hello,
> >> Python newbie here. ?I am working with Python and geoprocessing in ArcGIS.
> >> I'm taking a training course online and the exercise I'm working on makes
> >> mention of using PythonWin instead of Idle.
>
> >> I am using version 2.5 and have not been able to locate PythonWin. ?The
> >> download just includes Idle for the environment. ?Can anyone point me in the
> >> right direction to download the PythonWin piece of this puzzle?
>
> > Seems to be included inhttp://sourceforge.net/projects/pywin32/
>
> And it's well worth getting, since it's the recommended programming
> environment for ArcGIS. IIRC it uses the COM server capabilities to
> achieve some of the required magic.

It's the recommended programming environment in ESRI's geoprocessing
classes.
The only stuff that is specific to PythonWin is the debugging, (which
you can
do in IDLE too, just in a slightly different way).

Personally I do most of my python hacking in emacs, both when my code
calls
arcgisscripting and otherwise. Sometimes I use IDLE, since in emacs
(and PythonWin)
I miss the ability to restart the interpreter process to get a clean
environment.

There is one thing I use the pywin32 library for, and that is a little
hack to
get around the issue that each version of ArcGIS is bound to a
specific python version:

try:
    import arcgisscripting
except ImportError:
    import win32com.client
    class arcgisscripting(object):
        @staticmethod
        def create():
            return win32com.client.Dispatch
('esriGeoprocessing.GpDispatch.1')

With this little code snippet in a utility module, I can use python
2.6 with ArcGIS, and I can test my scritps with python 2.4, to ensure
that they run in ArcGIS 9.2 environments.

/Niklas Norrthon


From odeits at gmail.com  Fri Feb 27 01:26:18 2009
From: odeits at gmail.com (odeits)
Date: Thu, 26 Feb 2009 22:26:18 -0800 (PST)
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
Message-ID: <35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>

On Feb 26, 3:05?am, Clarendon <jine... at hotmail.com> wrote:
> Hi. This must be a simple command but I just can't find it in the
> Phthon manual. How do I delete all items with a certain condition from
> a list? For instance:
>
> L=['a', 'b', 'c', 'a']
>
> I want to delete all 'a's from the list.
> But if L.remove('a') only deletes the first 'a'.
>
> How do you delete all 'a's?
> I would really appreciate your help.
>
> Thanks.

while 'a' in L:
   L.remove('a')

not the most efficient but it works


From clp2 at rebertia.com  Fri Feb 27 01:59:54 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 26 Feb 2009 22:59:54 -0800
Subject: Delete all items in the list
In-Reply-To: <35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
Message-ID: <50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>

On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
> On Feb 26, 3:05?am, Clarendon <jine... at hotmail.com> wrote:
>> Hi. This must be a simple command but I just can't find it in the
>> Phthon manual. How do I delete all items with a certain condition from
>> a list? For instance:
>>
>> L=['a', 'b', 'c', 'a']
>>
>> I want to delete all 'a's from the list.
>> But if L.remove('a') only deletes the first 'a'.
>>
>> How do you delete all 'a's?
>> I would really appreciate your help.
>>
>> Thanks.
>
> while 'a' in L:
> ? L.remove('a')
>
> not the most efficient but it works

"Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
= number of 'a's in L], versus just N. And that's not even accounting
for all the extra element movement done by .remove()

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From hv at tbz-pariv.de  Fri Feb 27 03:20:17 2009
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Fri, 27 Feb 2009 09:20:17 +0100
Subject: OT: handling multiple software repositories
In-Reply-To: <mailman.828.1235665365.11746.python-list@python.org>
References: <70npmbFgb464U1@mid.individual.net>	<49A6BEE7.2090605@timgolden.me.uk>
	<mailman.828.1235665365.11746.python-list@python.org>
Message-ID: <70pm22Fh2534U1@mid.individual.net>

Luis Zarrabeitia schrieb:
...
> It's quite good (and easy to install, unlike gforge), but the developers are 
> moving on to a version 2.0 that you can find around here: 
> 
> http://basieproject.org/   (yeah, the website is ugly). 

Is uses django. That's nice since I know it.

But the page looks like it is not ready for public. But it looks
promising.

  Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From bearophileHUGS at lycos.com  Fri Feb 27 03:49:57 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:49:57 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
Message-ID: <5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>

Raymond Hettinger:
>Paul Rubin:
>>another (messy) approach would be to write a C
>>extension that uses a doubly linked list some day.
>
> That seems like an ideal implementation to me.

This was my Python implementation, where the delete too is O(1), but
it's slow:
http://code.activestate.com/recipes/498195/

I think the C extension with the doubly linked list is the best
approach.
Note that in modern CPUs caches are able to change the performance a
lot. So reducing the memory used is very important. So using the XOR
(or subtraction) trick to use only 1 pointer for each key-value may be
useful to keep performance not too much far from the normal python
dicts:
http://en.wikipedia.org/wiki/XOR_linked_list

Bye,
bearophile


From bearophileHUGS at lycos.com  Fri Feb 27 03:55:06 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:55:06 -0800 (PST)
Subject: Multiple conditional expression
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com> 
	<mailman.873.1235704646.11746.python-list@python.org>
Message-ID: <eb853273-0923-4c46-91d6-db6bc424290a@q9g2000yqc.googlegroups.com>

Chris Rebert:
> That seems to just be an overly complicated way of writing:
>
> spaces = bool(form.has_key('spaces') and form.getvalue('spaces') == 1)

Better:

spaces = bool(('spaces' in form) and form.getvalue('spaces') == 1)

Bye,
bearophile


From bearophileHUGS at lycos.com  Fri Feb 27 03:58:39 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 00:58:39 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
Message-ID: <516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>

odeits:
> How big of a list are we talking about? If the list is so big that the
> entire list cannot fit in memory at the same time this approach wont
> work e.g. removing duplicate lines from a very large file.

If the data are lines of a file, and keeping the original order isn't
important, then the first to try may be to use the unix (or cygwin on
Windows) commands sort and uniq.

Bye,
bearophile


From http  Fri Feb 27 04:00:46 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 01:00:46 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
Message-ID: <7xfxi08da9.fsf@ruckus.brouhaha.com>

bearophileHUGS at lycos.com writes:
> So using the XOR (or subtraction) trick to use only 1 pointer for
> each key-value may be useful to keep performance not too much far
> from the normal python dicts: http://en.wikipedia.org/wiki/XOR_linked_list

I don't see how to delete a randomly chosen node if you use that
trick, since the hash lookup doesn't give you two consecutive nodes
in the linked list to xor together.  Maybe you could do something
intricate with skip lists and end up with O(log n) deletion.


From lkassana at gmail.com  Fri Feb 27 04:02:57 2009
From: lkassana at gmail.com (lameck kassana)
Date: Fri, 27 Feb 2009 12:02:57 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <49A6A3FB.60708@holdenweb.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
Message-ID: <c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>

now it is working but i wonder it brings higher number of count as if it
counts files in wholes computer can you check in my code and correct me
------------------------------------------------
import glob
import os
 file_count=0
for files in glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://192.168.0.45/loader/Files/file_log/v20090225>
*"):
      file_count += len(files)
print 'Found', file_count, 'files in cwd'
--------------------------------------------------------------------------------------------------------------------------------

the results are Found 435656 files in cwd  --which is impossible since files
are around six thousands daily.
thanks in advance

On Thu, Feb 26, 2009 at 5:15 PM, Steve Holden <steve at holdenweb.com> wrote:

> lameck kassana wrote:
> > ok my original question is how can count the files of ceratin pattern(eg
> > *.txt) in remote directory .It seems use of glob.glob() for remote
> > directory is not working .Example I want to count the files in following
> > shared folder \\192.168.0.45\files <file://192.168.0.45/files> how can
> > do it by using glob.glob()
> >
> >>> glob.glob(r"\\houseboy\sholden\*.txt")
> ['\\\\houseboy\\sholden\\pgin1.txt',
> '\\\\houseboy\\sholden\\POSTGRES.TXT',
> '\\\\houseboy\\sholden\\gatesquote.txt',
> '\\\\houseboy\\sholden\\UbuntuWhatNow.txt',
>  '\\\\houseboy\\sholden\\patch001.txt']
> >>> glob.glob(r"\\192.168.2.200\sholden\*.txt")
> ['\\\\192.168.2.200\\sholden\\pgin1.txt',
> '\\\\192.168.2.200\\sholden\\POSTGRES.TXT',
> '\\\\192.168.2.200\\sholden\\gatesquote.txt',
> '\\\\192.168.2.200\\sholden\\UbuntuWhatNow.txt',
> '\\\\192.168.2.200\\sholden\\patch001.txt']
> >>>
>
> Working just fine for me.
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/
>
>
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From stefan_ml at behnel.de  Fri Feb 27 04:18:06 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 27 Feb 2009 10:18:06 +0100
Subject: removing duplication from a huge list.
In-Reply-To: <516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com>
Message-ID: <49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>

bearophileHUGS at lycos.com wrote:
> odeits:
>> How big of a list are we talking about? If the list is so big that the
>> entire list cannot fit in memory at the same time this approach wont
>> work e.g. removing duplicate lines from a very large file.
> 
> If the data are lines of a file, and keeping the original order isn't
> important, then the first to try may be to use the unix (or cygwin on
> Windows) commands sort and uniq.

or preferably "sort -u", in case that's supported.

Stefan


From nytrokiss at gmail.com  Fri Feb 27 04:20:20 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Fri, 27 Feb 2009 11:20:20 +0200
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
In-Reply-To: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
	<op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <8a6b8e350902270120j7ceb5faaxf773075a07eb289f@mail.gmail.com>

You can hook the it on the main thread and just pass it. And let the threads
execute.

On Thu, Feb 26, 2009 at 10:47 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Thu, 26 Feb 2009 16:17:42 -0200, Maxim Khitrov <mkhitrov at gmail.com>
> escribi?:
>
>
>  I'm looking for a function in the standard library or pywin32 package
>> that will block until a certain condition is met or it is interrupted
>> by Ctrl-C. For example, time.sleep() would have been perfect for my
>> needs if thread.interrupt_main() could interrupt the call from another
>> thread in the same way that Ctrl-C does. Unfortunately, that is not
>> the case.
>>
>> Another thing I tried was creating a pipe with os.pipe() and issuing a
>> read call on it. The event to exit was a single byte written to the
>> other end of the pipe, but Ctrl-C could not interrupt the read call.
>> The threading.Event class does not work for me, because it uses short
>> sleep intervals for timed waits. I need the reaction to be as close to
>> instant as possible, something like this will not do:
>>
>> while not <some condition is met>:
>>   sleep(0.01)
>>
>> I actually replaced threading.Event with my own version that uses
>> native Windows events, and waits on those also cannot be interrupted
>> by Ctrl-C. I'm trying to achieve the same effect as that while loop
>> and I don't care what the condition to exit is, but the loop needs to
>> exit as soon as the condition is met without waiting for up to X
>> additional milliseconds. Any ideas?
>>
>
> You may try MsgWaitForMultipleObjects - send a message to the main thread
> from the other thread.
> An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,
> but I've never actually tried in Python.
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From pranny at gmail.com  Fri Feb 27 04:33:44 2009
From: pranny at gmail.com (pranav)
Date: Fri, 27 Feb 2009 01:33:44 -0800 (PST)
Subject: String search
Message-ID: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>

Greeting fellow pycoders,

I have a script that browses large codes and replaces certain text
with some other text. Of lately i observed an issue.Some of the
original text were like

<cfif IsDefined("attributes.SOFTPREREQ")>
    ,N'#attributes.SOFTPREREQ#'
</cfif>

My module does scan this code and suggests replacement to this code.
But when i use the string.replace() method, it just fails. A
string.find() for above code in the whole file returns code -1.
Where am i going wrong? I figure it could be something to do with
character encoding or else.

Please someone guide me soon. I have a deadline to attend :-(

Thanks in advance,

Pranav




From gagsl-py2 at yahoo.com.ar  Fri Feb 27 04:43:48 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 07:43:48 -0200
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
Message-ID: <op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 07:02:57 -0200, lameck kassana <lkassana at gmail.com>  
escribi?:

> now it is working but i wonder it brings higher number of count as if it
> counts files in wholes computer can you check in my code and correct me
> ------------------------------------------------
> import glob
> import os
>  file_count=0
> for files in  
> glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://192.168.0.45/loader/Files/file_log/v20090225>
> *"):

Add this line:
        print files

>       file_count += len(files)
> print 'Found', file_count, 'files in cwd'
> --------------------------------------------------------------------------------------------------------------------------------
>
> the results are Found 435656 files in cwd  --which is impossible since  
> files
> are around six thousands daily.

-- 
Gabriel Genellina



From CinnamonDonkey at googlemail.com  Fri Feb 27 04:45:39 2009
From: CinnamonDonkey at googlemail.com (CinnamonDonkey)
Date: Fri, 27 Feb 2009 01:45:39 -0800 (PST)
Subject: Microsoft Message Queues
Message-ID: <c312ac5a-3262-43ef-b2b0-e50bfb074db8@h20g2000yqn.googlegroups.com>

Hi All,

I am looking to use win32com to set-up a Microsoft Message Queue
(MSMQ) between two or more computers connected on a LAN.

I have found this posting:

http://groups.google.co.uk/group/comp.lang.python/browse_thread/thread/80b42375ae84e3d7/989b864575997a9e?hl=en&lnk=gst&q=msmq#989b864575997a9e

...Which is a great start. But I am fairly new to all this python
business, let alone COM.

Can someone please point me in the right direction to modify this
example so that it works across multiple computers connected via the
LAN.

I have demonstrated it working locally... I just need to progress to
that next step.

Regards,
Shaun



From arunjr at gmail.com  Fri Feb 27 04:45:55 2009
From: arunjr at gmail.com (Aj)
Date: Fri, 27 Feb 2009 01:45:55 -0800 (PST)
Subject: decimal to string conv
Message-ID: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>

Hi all,

I am trying to convert a list to string.
example [80, 89,84,72,79,78,0] is my input. I could make it to just
[0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
but I wanted it to be like "PYTHON".
I couldnt even convert 0x50 to 'P'. Is there any library api available
to do this? it will be really helpful to me.
dont bang me if its already being asked. I just 'dived' into python
yesterday.

cheers
Aj.


From clp2 at rebertia.com  Fri Feb 27 04:58:26 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 01:58:26 -0800
Subject: decimal to string conv
In-Reply-To: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
References: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
Message-ID: <50697b2c0902270158m582bdfdcy87d2b59cde6f1314@mail.gmail.com>

On Fri, Feb 27, 2009 at 1:45 AM, Aj <arunjr at gmail.com> wrote:
> Hi all,
>
> I am trying to convert a list to string.
> example [80, 89,84,72,79,78,0] is my input. I could make it to just
> [0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
> but I wanted it to be like "PYTHON".
> I couldnt even convert 0x50 to 'P'. Is there any library api available
> to do this? it will be really helpful to me.

lst = [80, 89,84,72,79,78,0]
print ''.join(map(chr, lst[:-1]))

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From arunjr at gmail.com  Fri Feb 27 05:07:53 2009
From: arunjr at gmail.com (Aj)
Date: Fri, 27 Feb 2009 02:07:53 -0800 (PST)
Subject: decimal to string conv
References: <0cd6257f-c886-4878-af14-c747f6d94936@o11g2000yql.googlegroups.com>
	<mailman.886.1235728711.11746.python-list@python.org>
Message-ID: <2fd546ee-b57d-446d-8168-d81a97302836@e18g2000yqo.googlegroups.com>

On Feb 27, 10:58?am, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Feb 27, 2009 at 1:45 AM, Aj <aru... at gmail.com> wrote:
> > Hi all,
>
> > I am trying to convert a list to string.
> > example [80, 89,84,72,79,78,0] is my input. I could make it to just
> > [0x50,0x59,0x54,0x48,0x4F,0x4E,0x00].
> > but I wanted it to be like "PYTHON".
> > I couldnt even convert 0x50 to 'P'. Is there any library api available
> > to do this? it will be really helpful to me.
>
> lst = [80, 89,84,72,79,78,0]
> print ''.join(map(chr, lst[:-1]))
>
> Cheers,
> Chris
>
> --
> Follow the path of the Iguana...http://rebertia.com

wow... that was quick and it works perfect with my inputs.
thanx & have a nice day.

cheers
Aj


From bruno.42.desthuilliers at websiteburo.invalid  Fri Feb 27 05:15:25 2009
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 27 Feb 2009 11:15:25 +0100
Subject: String search
In-Reply-To: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
Message-ID: <49a7bd24$0$5835$426a74cc@news.free.fr>

pranav a ?crit :
> Greeting fellow pycoders,
> 
> I have a script that browses large codes and replaces certain text
> with some other text. Of lately i observed an issue.Some of the
> original text were like
> 
> <cfif IsDefined("attributes.SOFTPREREQ")>
>     ,N'#attributes.SOFTPREREQ#'
> </cfif>
> 
> My module does scan this code and suggests replacement to this code.
> But when i use the string.replace() method, it just fails. A
> string.find() for above code in the whole file returns code -1.
> Where am i going wrong? 

Not posting a minimal (and if possible runnable) excerpt of your code 
exhibiting the problem, along with test data.

>I figure it could be something to do with
> character encoding or else.

or with white spaces (including newlines characters), or whatever.

As a general guideline : any non-trivial text parsing requires a 
non-trivial parser.


From bearophileHUGS at lycos.com  Fri Feb 27 05:15:27 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 02:15:27 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
Message-ID: <3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>

Paul Rubin:
>I don't see how to delete a randomly chosen node if you use that trick, since the hash lookup doesn't give you two consecutive nodes in the linked list to xor together.<

Thank you, I think you are right, I am sorry.
So on 32-bit CPUs you need to add 8 bytes to each value.

On 64-bit CPUs you may use a double indexed list, instead of a double
linked list. And each index can be stored in 6 bytes instead of 8
(281_474_976_710_656 buckets may be enough for most people), so you
need only 12 bytes for two indexes instead of 16 bytes, this helps the
L1 cache (and the small L2 cache too on Core i7) a bit. But this may
slow down too much the ordered iteration.

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 05:17:18 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 08:17:18 -0200
Subject: String search
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
Message-ID: <op.upz9i4iqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 07:33:44 -0200, pranav <pranny at gmail.com> escribi?:

> Greeting fellow pycoders,
>
> I have a script that browses large codes and replaces certain text
> with some other text. Of lately i observed an issue.Some of the
> original text were like
>
> <cfif IsDefined("attributes.SOFTPREREQ")>
>     ,N'#attributes.SOFTPREREQ#'
> </cfif>
>
> My module does scan this code and suggests replacement to this code.
> But when i use the string.replace() method, it just fails. A
> string.find() for above code in the whole file returns code -1.
> Where am i going wrong? I figure it could be something to do with
> character encoding or else.

Do you mean, you look for those three complete lines with a single  
xxxx.find(...)?
Hard to guess... maybe there is some withespace at the end of a line, some  
additional leading whitespace in the second line, a tab character instead  
of spaces, maybe those ' are instead ? or `, maybe the file does not use  
\n as a line termination, maybe the file encoding doesn't match what you  
expect...

If string.find() does return -1, it is because the text you're looking for  
is NOT inside the string. No use in questioning that. If you think the  
text IS there, get a decent hex editor and examine the file near the  
supposed match, character by character, and see WHERE is the difference  
(there MUST be a difference).

-- 
Gabriel Genellina



From lkassana at gmail.com  Fri Feb 27 05:17:28 2009
From: lkassana at gmail.com (lameck kassana)
Date: Fri, 27 Feb 2009 13:17:28 +0300
Subject: problem with glob in remote directory or os.walk in remote 
	directory in windos
In-Reply-To: <op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>
	<go66hd$slr$1@ger.gmane.org>
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
	<op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>

At last i did it it was this wrong line file_count += len(files) ---it
supposed to be  file_count+=1
but thanks for help ya python masters .Steven Holden ,,,, thanks very very
much for your tip about raw string

On Fri, Feb 27, 2009 at 12:43 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Fri, 27 Feb 2009 07:02:57 -0200, lameck kassana <lkassana at gmail.com>
> escribi?:
>
>  now it is working but i wonder it brings higher number of count as if it
>> counts files in wholes computer can you check in my code and correct me
>> ------------------------------------------------
>> import glob
>> import os
>>  file_count=0
>> for files in
>> glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225<file://
>> 192.168.0.45/loader/Files/file_log/v20090225>
>> *"):
>>
>
> Add this line:
>       print files
>
>      file_count += len(files)
>> print 'Found', file_count, 'files in cwd'
>>
>> --------------------------------------------------------------------------------------------------------------------------------
>>
>> the results are Found 435656 files in cwd  --which is impossible since
>> files
>> are around six thousands daily.
>>
>
> --
> Gabriel Genellina
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20090227/8ecfd189/attachment-0001.html>

From gagsl-py2 at yahoo.com.ar  Fri Feb 27 06:08:10 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 09:08:10 -0200
Subject: factoring wx.Image
References: <49A74AB7.8010808@al.com.au>
Message-ID: <op.upzucilux6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 00:06:47 -0200, Astan Chee <astan.chee at al.com.au>
escribi?:

> I want to factor (red, green and blue at the same time) an image using  
> wx but without any GUI display or windows but it keeps crashing

What do you mean? Really crashing? Or do you get a Python stack trace?

> and if I set the checks to ignore it, it doesn't produce the images at  
> all.
> It looks like this:
>
> import wx
> img = wx.Image("star.jpg",wx.BITMAP_TYPE_BMP)

Are you sure the format is BITMAP_TYPE_BMP? The name seems to indicate
otherwise...

> factor = 1
> for i in range(1,30):
>     image = img.AdjustChannels(factor, factor, factor, 1)

And multiplying r,g,b by 30 you'll get an almost white image - is it what
you want?

>     fname = "star." + str(factor) + ".jpg"
>     img.SaveFile(fname,wx.BITMAP_TYPE_JPEG)
>     factor+=1

Note that you're saving the ORIGINAL image here...

>
> What am I missing here? What am I doing wrong? Can this even be done  
> with only wx?

Try again...

-- 
Gabriel Genellina



From eckhardt at satorlaser.com  Fri Feb 27 06:29:16 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 27 Feb 2009 12:29:16 +0100
Subject: struct.unpack() on a stream
Message-ID: <edvk76-tf3.ln1@satorlaser.homedns.org>

Hi!

I have a socket from which I would like to parse some data, how would I do
that? Of course, I can manually read data from the socket until unpack()
stops complaining about a lack of data, but that sounds rather inelegant.

Any better suggestions?

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From odeits at gmail.com  Fri Feb 27 06:34:34 2009
From: odeits at gmail.com (odeits)
Date: Fri, 27 Feb 2009 03:34:34 -0800 (PST)
Subject: String search
References: <262dfa16-1169-448b-ae59-76d32ce3fbb1@r18g2000vbi.googlegroups.com>
	<mailman.888.1235729870.11746.python-list@python.org>
Message-ID: <f43870bf-232d-4b34-8426-862fabd5e2b7@r15g2000prh.googlegroups.com>

On Feb 27, 2:17?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 27 Feb 2009 07:33:44 -0200, pranav <pra... at gmail.com> escribi?:
>
> > Greeting fellow pycoders,
>
> > I have a script that browses large codes and replaces certain text
> > with some other text. Of lately i observed an issue.Some of the
> > original text were like
>
> > <cfif IsDefined("attributes.SOFTPREREQ")>
> > ? ? ,N'#attributes.SOFTPREREQ#'
> > </cfif>
>
> > My module does scan this code and suggests replacement to this code.
> > But when i use the string.replace() method, it just fails. A
> > string.find() for above code in the whole file returns code -1.
> > Where am i going wrong? I figure it could be something to do with
> > character encoding or else.
>
> Do you mean, you look for those three complete lines with a single ?
> xxxx.find(...)?
> Hard to guess... maybe there is some withespace at the end of a line, some ?
> additional leading whitespace in the second line, a tab character instead ?
> of spaces, maybe those ' are instead ? or `, maybe the file does not use ?
> \n as a line termination, maybe the file encoding doesn't match what you ?
> expect...
>
> If string.find() does return -1, it is because the text you're looking for ?
> is NOT inside the string. No use in questioning that. If you think the ?
> text IS there, get a decent hex editor and examine the file near the ?
> supposed match, character by character, and see WHERE is the difference ?
> (there MUST be a difference).
>
> --
> Gabriel Genellina

Try looking into regular expressions.... http://docs.python.org/library/re.html


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 06:52:38 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 09:52:38 -0200
Subject: struct.unpack() on a stream
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
Message-ID: <op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt  
<eckhardt at satorlaser.com> escribi?:

> I have a socket from which I would like to parse some data, how would I  
> do
> that? Of course, I can manually read data from the socket until unpack()
> stops complaining about a lack of data, but that sounds rather inelegant.
>
> Any better suggestions?

Read until you get the required bytes; use the size attribute.

-- 
Gabriel Genellina



From google at mrabarnett.plus.com  Fri Feb 27 07:10:39 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Fri, 27 Feb 2009 12:10:39 +0000
Subject: struct.unpack() on a stream
In-Reply-To: <op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
	<op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <49A7D83F.6060904@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt 
> <eckhardt at satorlaser.com> escribi?:
> 
>> I have a socket from which I would like to parse some data, how would 
>> I do
>> that? Of course, I can manually read data from the socket until unpack()
>> stops complaining about a lack of data, but that sounds rather inelegant.
>>
>> Any better suggestions?
> 
> Read until you get the required bytes; use the size attribute.
> 
The struct module has a function called "calcsize", eg:

 >>> import struct
 >>> struct.calcsize("<H")
2

That will tell you how many bytes to read.


From steve at holdenweb.com  Fri Feb 27 07:16:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 07:16:32 -0500
Subject: problem with glob in remote directory or os.walk in remote
	directory in windos
In-Reply-To: <c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	
	<go66hd$slr$1@ger.gmane.org>	
	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>	
	<49A6A3FB.60708@holdenweb.com>
	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>
Message-ID: <49A7D9A0.1060803@holdenweb.com>

lameck kassana wrote:
> now it is working but i wonder it brings higher number of count as if it
> counts files in wholes computer can you check in my code and correct me
> ------------------------------------------------
> import glob
> import os
>  file_count=0
> for files in glob.glob(r"\\192.168.0.45\loader\Files\file_log\v20090225
> <file://192.168.0.45/loader/Files/file_log/v20090225>*"):
>       file_count += len(files)
> print 'Found', file_count, 'files in cwd'
> --------------------------------------------------------------------------------------------------------------------------------
>  
> the results are Found 435656 files in cwd  --which is impossible since
> files are around six thousands daily.
> thanks in advance
> 
Please don't use "reply all" - I subscribe to the list, and will see
your posting there. I am pretty sure by now someone has pointed out that
you are adding the lengths of the filenames, and what you instead need is

file_count = len(glob.glob(...))

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steven.oldner at gmail.com  Fri Feb 27 07:42:29 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Fri, 27 Feb 2009 04:42:29 -0800 (PST)
Subject: Data Coding suggestions
Message-ID: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>

Just learning Python and have a project to create a weekly menu and a
shopping list from the menu.  This is something I do manually now, so
I'm automating it.

What I'd like is a list of menu choices, such as:
CODE-  Description - Est Cost

'B01 - Pancakes, Sausage,and Eggs - $5.80,
'L01 - Tuna Fish sandwices and chips -$ 4.25 ,
'D01 - Dirty Rice and Garlic Bread' - $5.70.

>From the choices, I'll create a weekly menu, print the menu, and then
print list of ingredients ( and sum the commom items)

CODE- Item - Qty. - Unit
B01 - pancake mix - 1 - box
B01 - milk             - .3 -gal
B01 - eggs            - 10 - each
D01 - dirty rice mix - 1 - box
D01 - milk             - .3 - gal.

I would like to expand the ingredient list to include other fields
like 'last purchase date' and 'reorder point'.

I've used an example program and started to code it but just realized
I've been coding ABAP in Python, that is set up a data structure and
use that.  What I want is to learn code Python in Python.

Question:  How should I set up the data?  I'm looking at maybe 70 menu
items and maybe 1000 items for the shopping list.  I need to be able
to maintain each item also.

I am using python 2.6 but would like to use 3.0.

Thanks for any suggestions!



From alecla at bluewin.ch  Fri Feb 27 07:46:37 2009
From: alecla at bluewin.ch (alex)
Date: Fri, 27 Feb 2009 04:46:37 -0800 (PST)
Subject: TextCtrl fully expanding at program start
Message-ID: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>

Hi all
I have a gridsizer consisting of two vertically stacked panels, one
with a StaticBox and the other with a TextCtrl.
I would like that the TextCtrl expands at program start fully to the
allocated panel size (lower panel of gridSizer).
Instead of like now, fully expanding in the width but not exapnding in
the height direction (two lines high).

I am currently running in circles so maybe can anybody help me?
See below for my best effort (OS WinXP, Python 2.5).

Thank you, regards Alex



import wx

class Frame(wx.Frame):
    def __init__(self, title, pos, size):
        wx.Frame.__init__(self, None, -1, title, pos, size)

        self.panel = wx.Panel(self)
        self.panel.SetBackgroundColour(wx.Colour(220, 220, 220))

        box1 = wx.StaticBox(self.panel, -1, "Program Preferences")
        box2 = wx.TextCtrl(self.panel, -1, size=(-1,-1),style =
wx.TE_MULTILINE|wx.TE_READONLY)


        gs = wx.GridSizer(2, 1, 0, 0)
        windowOneSizer = wx.BoxSizer(wx.VERTICAL)
        windowTwoSizer = wx.BoxSizer(wx.VERTICAL)

        windowOneSizer.Add(box1, 0, wx.ALL|wx.EXPAND, 0)
        windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)

        gs.Add(windowOneSizer, 0, wx.ALL|wx.EXPAND, 2)
        gs.Add(windowTwoSizer, 0, wx.ALL|wx.EXPAND, 2)

        self.panel.SetSizer(gs)
        self.Centre()
        self.Show(True)


class App(wx.App):
    def OnInit(self):
        frame = Frame("My Frame", (100, 100), (400, 250))
        frame.Show()
        self.SetTopWindow(frame)
        return True
#
#
if __name__ == '__main__':
#
    app = App()
    app.MainLoop()
#
#



From odeits at gmail.com  Fri Feb 27 07:49:39 2009
From: odeits at gmail.com (odeits)
Date: Fri, 27 Feb 2009 04:49:39 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com> 
	<49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>
Message-ID: <2c31654a-ca32-4d91-af0c-9cb72d0da793@o8g2000pre.googlegroups.com>

On Feb 27, 1:18?am, Stefan Behnel <stefan... at behnel.de> wrote:
> bearophileH... at lycos.com wrote:
> > odeits:
> >> How big of a list are we talking about? If the list is so big that the
> >> entire list cannot fit in memory at the same time this approach wont
> >> work e.g. removing duplicate lines from a very large file.
>
> > If the data are lines of a file, and keeping the original order isn't
> > important, then the first to try may be to use the unix (or cygwin on
> > Windows) commands sort and uniq.
>
> or preferably "sort -u", in case that's supported.
>
> Stefan

Although this is true, that is more of an answer to the question "How
do i remove duplicates from a huge list in Unix?".


From bearophileHUGS at lycos.com  Fri Feb 27 07:57:11 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 04:57:11 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<516a626d-62ee-48c0-acc3-dbf044b163a4@q11g2000yqh.googlegroups.com> 
	<49a7afce$0$32663$9b4e6d93@newsspool2.arcor-online.net>
	<2c31654a-ca32-4d91-af0c-9cb72d0da793@o8g2000pre.googlegroups.com>
Message-ID: <2a4bdb93-50aa-48f6-8979-277a5d2ca5e8@v19g2000yqn.googlegroups.com>

odeits:
> Although this is true, that is more of an answer to the question "How
> do i remove duplicates from a huge list in Unix?".

Don't you like cygwin?

Bye,
bearophile


From gagsl-py2 at yahoo.com.ar  Fri Feb 27 07:58:51 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 27 Feb 2009 10:58:51 -0200
Subject: struct.unpack() on a stream
References: <edvk76-tf3.ln1@satorlaser.homedns.org>
	<op.up0dx0uqx6zn5v@gabriel.sleipnir-bsas>
	<49A7D83F.6060904@mrabarnett.plus.com>
Message-ID: <op.up0g0dj8x6zn5v@gabriel.sleipnir-bsas>

En Fri, 27 Feb 2009 10:10:39 -0200, MRAB <google at mrabarnett.plus.com>  
escribi?:

> Gabriel Genellina wrote:
>> En Fri, 27 Feb 2009 09:29:16 -0200, Ulrich Eckhardt  
>> <eckhardt at satorlaser.com> escribi?:
>>
>>> I have a socket from which I would like to parse some data, how would  
>>> I do
>>> that? Of course, I can manually read data from the socket until  
>>> unpack()
>>> stops complaining about a lack of data, but that sounds rather  
>>> inelegant.
>>>
>>> Any better suggestions?
>>  Read until you get the required bytes; use the size attribute.
>>
> The struct module has a function called "calcsize", eg:
>
>  >>> import struct
>  >>> struct.calcsize("<H")
> 2
>
> That will tell you how many bytes to read.

The struct module defines also a Struct class; instead of using the module  
functions, it's more efficient to create a Struct instance and call its  
methods when one is going to use the same format more than once:

py> s = struct.Struct("<H")
py> s.size
2
py> s.unpack("\x40\x00")
(64,)

That's the size attribute I was talking about - too tersely perhaps.

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Feb 27 08:03:32 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:03:32 -0500
Subject: Queries
In-Reply-To: <wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
Message-ID: <go8occ$pd$1@ger.gmane.org>

Dennis Lee Bieber wrote:
[...]
> {Oh, and since I saw, at work, a later post with a bunch of nested UNION
> statements: UNION requires all the tables to have the same number/type
> of columns -- you don't have that}

A rather fine point, but technically all that's required is the the
united *queries* have the same number and type of columns. I assume that
the OP was selecting *, though ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:05:23 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:05:23 -0500
Subject: problem with glob in remote directory or os.walk in remote  
	directory in windos
In-Reply-To: <c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>
References: <c2db7d630902260438q39786784mbe2011396fe790b1@mail.gmail.com>	<go66hd$slr$1@ger.gmane.org>	<c2db7d630902260603i7a52281at74829e22397409c9@mail.gmail.com>	<49A6A3FB.60708@holdenweb.com>	<c2db7d630902270102w75e219e4y9fae8a194ed25a6@mail.gmail.com>	<op.upz7zblhx6zn5v@gabriel.sleipnir-bsas>
	<c2db7d630902270217v73c64232m5ea9778e06e2ca91@mail.gmail.com>
Message-ID: <go8ofs$pd$2@ger.gmane.org>

lameck kassana wrote:
> At last i did it it was this wrong line file_count += len(files) ---it
> supposed to be  file_count+=1
> but thanks for help ya python masters .Steven Holden ,,,, thanks very
> very much for your tip about raw string
> 
Lameck:

Please note that

file_count = 0
for files in (...):
    file_count += 1

can be *much* more efficiently expressed as

file_count = len(...)

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:08:42 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:08:42 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>	<871vtk7ub8.fsf@mulj.homelinux.net>	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>	<7x63iwg2wg.fsf@ruckus.brouhaha.com>	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
Message-ID: <go8om2$pd$3@ger.gmane.org>

bearophileHUGS at lycos.com wrote:
> Paul Rubin:
>> I don't see how to delete a randomly chosen node if you use that trick, since the hash lookup doesn't give you two consecutive nodes in the linked list to xor together.<
> 
> Thank you, I think you are right, I am sorry.
> So on 32-bit CPUs you need to add 8 bytes to each value.
> 
> On 64-bit CPUs you may use a double indexed list, instead of a double
> linked list. And each index can be stored in 6 bytes instead of 8
> (281_474_976_710_656 buckets may be enough for most people), so you
> need only 12 bytes for two indexes instead of 16 bytes, this helps the
> L1 cache (and the small L2 cache too on Core i7) a bit. But this may
> slow down too much the ordered iteration.
> 
A sort of premature pessimization, then.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:10:30 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:10:30 -0500
Subject: Delete all items in the list
In-Reply-To: <50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
Message-ID: <go8opf$pd$4@ger.gmane.org>

Chris Rebert wrote:
> On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
[...]
>> while 'a' in L:
>>   L.remove('a')
>>
>> not the most efficient but it works
> 
> "Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
> = number of 'a's in L], versus just N. And that's not even accounting
> for all the extra element movement done by .remove()
> 
Surely 2*O(M*N) is O(M*N) since constant factors are irrelevant in
assessing performance order?

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:13:35 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:13:35 -0500
Subject: Multiple conditional expression
In-Reply-To: <1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
References: <1a7951080902261911h62798085uf3c4336f2aa631a0@mail.gmail.com>	<mailman.873.1235704646.11746.python-list@python.org>	<7xhc2gv9h6.fsf@ruckus.brouhaha.com>	<f-qdnXySMIeJ8DrUnZ2dnUVZ_qDinZ2d@posted.usinternet>
	<1a7951080902262039l14c296f0m72a51281f1ad7626@mail.gmail.com>
Message-ID: <49A7E6FF.8060703@holdenweb.com>

Anjanesh Lekshminarayanan wrote:
>> How do we know that from the what the OP posted?
> Its CGI alright.
> spaces = form.has_key('spaces') and form.getvalue('spaces') == '1'
> 
> But I just dont see how
> spaces = (form.has_key('spaces') ? form.getvalue('spaces') == 1 ?
> True: False : False)
> is complicated in anyway. Its not that hard to read at all.
> 
In that case I fear Python will be far too simple for your clearly
impressive mind. You've been programming for way too long ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From steve at holdenweb.com  Fri Feb 27 08:27:53 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 08:27:53 -0500
Subject: Data Coding suggestions
In-Reply-To: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
Message-ID: <go8pq2$77d$1@ger.gmane.org>

steven.oldner wrote:
> Just learning Python and have a project to create a weekly menu and a
> shopping list from the menu.  This is something I do manually now, so
> I'm automating it.
> 
> What I'd like is a list of menu choices, such as:
> CODE-  Description - Est Cost
> 
> 'B01 - Pancakes, Sausage,and Eggs - $5.80,
> 'L01 - Tuna Fish sandwices and chips -$ 4.25 ,
> 'D01 - Dirty Rice and Garlic Bread' - $5.70.
> 
>>From the choices, I'll create a weekly menu, print the menu, and then
> print list of ingredients ( and sum the commom items)
> 
> CODE- Item - Qty. - Unit
> B01 - pancake mix - 1 - box
> B01 - milk             - .3 -gal
> B01 - eggs            - 10 - each
> D01 - dirty rice mix - 1 - box
> D01 - milk             - .3 - gal.
> 
> I would like to expand the ingredient list to include other fields
> like 'last purchase date' and 'reorder point'.
> 
> I've used an example program and started to code it but just realized
> I've been coding ABAP in Python, that is set up a data structure and
> use that.  What I want is to learn code Python in Python.
> 
> Question:  How should I set up the data?  I'm looking at maybe 70 menu
> items and maybe 1000 items for the shopping list.  I need to be able
> to maintain each item also.
> 
> I am using python 2.6 but would like to use 3.0.
> 
Well from the nature of the task it seems evident that the data should
be long-lived, and therefore need to be stored on disk. The natural way
to deal with them in the program would be to have recipes, each of which
was associated with a number of ingredient requirements, each of which
was associated with an ingredient.

That way, you can adjust the prices of your ingredients as the market
varies.

Recent versions of Python come with sqlite, a low-cost but surprisingly
efficient relational database implementation. I'd suggest using that,
with the following tables:

Recipe:
  id          integer primary key
  name        string

Ingredient
  id          integer primary key
  name        string
  unit        string [oz, gal, etc.]
  cost        number [cost per unit]

Requirement
  recipe      integer [id of recipe]
  ingredient  integer [id of ingredient]
  quantity    number [amount required for one serving]

So each recipe will have one row in the recipe table, a number of rows
in the requirement table, each of which points also to the relevant
ingredient.

>From there it's a relatively simple task to work out how much of which
ingredients is required to create N helpings of a specific recipe, and
the cost as well.

It will mean understanding a little more about database than you perhaps
do right now, but that's a useful addition to any programmer's bag of
tricks.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From clp2 at rebertia.com  Fri Feb 27 08:46:47 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 05:46:47 -0800
Subject: Delete all items in the list
In-Reply-To: <go8opf$pd$4@ger.gmane.org>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
	<go8opf$pd$4@ger.gmane.org>
Message-ID: <50697b2c0902270546l1badb577kde883f998a24575@mail.gmail.com>

On Fri, Feb 27, 2009 at 5:10 AM, Steve Holden <steve at holdenweb.com> wrote:
> Chris Rebert wrote:
>> On Thu, Feb 26, 2009 at 10:26 PM, odeits <odeits at gmail.com> wrote:
> [...]
>>> while 'a' in L:
>>> ? L.remove('a')
>>>
>>> not the most efficient but it works
>>
>> "Not the most efficient"; it's terribly inefficient! It's 2*O(M*N) [M
>> = number of 'a's in L], versus just N. And that's not even accounting
>> for all the extra element movement done by .remove()
>>
> Surely 2*O(M*N) is O(M*N) since constant factors are irrelevant in
> assessing performance order?

Obviously that equivalence is true, but in this case I'm emphasizing
that it's even worse than that when constant factors are taken into
account. Big-O is nice in the abstract, but in the real-world those
constant factors can matter.

In pure big-O, it is indeed O(M*N) vs. O(N)
Including constant factors, the performance is roughly 2*M*N*X [X =
overhead of remove()] vs. N, which makes the badness of the algorithm
all the more apparent.

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From loretta at fhv.at  Fri Feb 27 08:51:49 2009
From: loretta at fhv.at (Loretta SALINO)
Date: Fri, 27 Feb 2009 14:51:49 +0100
Subject: OT: handling multiple software repositories
References: <70npmbFgb464U1@mid.individual.net>
	<mailman.826.1235664617.11746.python-list@python.org>
Message-ID: <49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>

Tim Golden wrote:

> Thomas Guettler wrote:
>> Hi,
>> 
>> this is a bit off topic.
>> 
>> In our company we have several SVN repositories.
>> 
>> According to [1] Trac by default only handles one
>> repository.
>> 
>> Of course Trac links like changeset [1234] would not work anymore.
>> You would need [repro/1234] or something like this.
>> 
>> I think many (python) programmer have several repositories
>> and need to handle this somehow.
>> 
>> How do you do this?
>> 
>> I want a common wiki and a common bug tracker. It should
>> be possible to attach a bug to several repositories.
>> 
>> Up to now I don't use Trac, if someone has an alternative, please
>> tell me!
> 
> 
> Have a look at DrProject[1], a Trac-alike which handles
> multiple projects. (Not used it myself).
> 
> TJG
> 
> [1] https://www.drproject.org/

Good hint, thanks! I'm in the same situation and have been installing Trac
right these days. However, where is DrProject?

Following the links pointing to TGZs fails and installing from svn doesn't
work poperly (error messages about PyDispatcher). So, how did/do you
install DrProject?

Kind regards
Loretta






From andrei.avk at gmail.com  Fri Feb 27 08:57:34 2009
From: andrei.avk at gmail.com (Rainy)
Date: Fri, 27 Feb 2009 05:57:34 -0800 (PST)
Subject: ANN: updates to Python-by-example
Message-ID: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>

Python-by-example <a href="http://pbe.lightbird.net/index.html">http://
pbe.lightbird.net</a> has some new modules added: pickle, shelve,
sqlite3, gzip, csv, configparser, optparse, logging. I also changed
over to using excellent sphinx package to generate documentation, this
will allow me to add pdf and windows help formats soon (I ran into
some issues with that, actually). More modules coming soon, too! -AK


From ra.ravi.rav at gmail.com  Fri Feb 27 08:59:11 2009
From: ra.ravi.rav at gmail.com (Ravi)
Date: Fri, 27 Feb 2009 05:59:11 -0800 (PST)
Subject: Make a python property with the same name as the class member name
Message-ID: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>

Is it possible in python to create a property with the same name as
the member variable name of the class. e.g.

Class X:
    ...
    self.i = 10 # marker
    ...
    property(fget = get_i, fset = set_i)

Please tell me how I can do so. Because if I do so, for the statement
at marker I get stack overflow for the assingm


From mail at timgolden.me.uk  Fri Feb 27 09:05:57 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 27 Feb 2009 14:05:57 +0000
Subject: OT: handling multiple software repositories
In-Reply-To: <49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>
References: <70npmbFgb464U1@mid.individual.net>	<mailman.826.1235664617.11746.python-list@python.org>
	<49a7eff5$0$12126$3b214f66@aconews.univie.ac.at>
Message-ID: <49A7F345.7060402@timgolden.me.uk>

Loretta SALINO wrote:
> Tim Golden wrote:
> 
>> Thomas Guettler wrote:
>>> Hi,
>>>
>>> this is a bit off topic.
>>>
>>> In our company we have several SVN repositories.
>>>
>>> According to [1] Trac by default only handles one
>>> repository.
>>>
>>> Of course Trac links like changeset [1234] would not work anymore.
>>> You would need [repro/1234] or something like this.
>>>
>>> I think many (python) programmer have several repositories
>>> and need to handle this somehow.
>>>
>>> How do you do this?
>>>
>>> I want a common wiki and a common bug tracker. It should
>>> be possible to attach a bug to several repositories.
>>>
>>> Up to now I don't use Trac, if someone has an alternative, please
>>> tell me!
>>
>> Have a look at DrProject[1], a Trac-alike which handles
>> multiple projects. (Not used it myself).
>>
>> TJG
>>
>> [1] https://www.drproject.org/
> 
> Good hint, thanks! I'm in the same situation and have been installing Trac
> right these days. However, where is DrProject?
> 
> Following the links pointing to TGZs fails and installing from svn doesn't
> work poperly (error messages about PyDispatcher). So, how did/do you
> install DrProject?

I didn't, I'm afraid (cf above). Hopefully someone who has, or even
one of the maintainers, can chip in.

TJG


From et1ssgmiller at gmail.com  Fri Feb 27 09:12:30 2009
From: et1ssgmiller at gmail.com (Greg Miller)
Date: Fri, 27 Feb 2009 06:12:30 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
Message-ID: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>

I am working on a program that controls a piece of equipment.  The GUI/
control software is written with Python2.5/wxPython.  I would like to
know if there is a way of starting the GUI without the DOS window
having to launch?  I would like only the application itself to appear,
no DOS window.  Thanks for any information.
Greg Miller


From vlastimil.brom at gmail.com  Fri Feb 27 09:14:49 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 27 Feb 2009 15:14:49 +0100
Subject: TextCtrl fully expanding at program start
In-Reply-To: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
References: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
Message-ID: <9fdb569a0902270614k12a011bbu42394e0630b9e9a7@mail.gmail.com>

2009/2/27 alex <alecla at bluewin.ch>:
> Hi all
> I have a gridsizer consisting of two vertically stacked panels, one
> with a StaticBox and the other with a TextCtrl.
> I would like that the TextCtrl expands at program start fully to the
> allocated panel size (lower panel of gridSizer).
> Instead of like now, fully expanding in the width but not exapnding in
> the height direction (two lines high).
...
>

Hi,
changing the proportion for adding the textctrl into the sizer to 1
should expand it to the lower half of the panel.

try changing:
        windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)
TO:
        windowTwoSizer.Add(box2, 1, wx.ALL|wx.EXPAND, 0)

See
http://www.wxpython.org/docs/api/wx.Sizer-class.html#Add
for the options for adding into the sizer.

hth
   vbr


From eckhardt at satorlaser.com  Fri Feb 27 09:26:27 2009
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 27 Feb 2009 15:26:27 +0100
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
Message-ID: <kp9l76-9p4.ln1@satorlaser.homedns.org>

Greg Miller wrote:
> I would like to know if there is a way of starting the GUI 
> without the DOS window having to launch?

Use pythonw.exe instead of python.exe.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From pruebauno at latinmail.com  Fri Feb 27 09:28:12 2009
From: pruebauno at latinmail.com (pruebauno at latinmail.com)
Date: Fri, 27 Feb 2009 06:28:12 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
Message-ID: <5db4e50e-6882-4c23-83cf-df50315896c0@a39g2000yqc.googlegroups.com>

On Feb 27, 9:12?am, Greg Miller <et1ssgmil... at gmail.com> wrote:
> I am working on a program that controls a piece of equipment. ?The GUI/
> control software is written with Python2.5/wxPython. ?I would like to
> know if there is a way of starting the GUI without the DOS window
> having to launch? ?I would like only the application itself to appear,
> no DOS window. ?Thanks for any information.
> Greg Miller

change the extension of your python program from ".py" to ".pyw".
Alternatively make sure that your program gets started by pythonw.exe
(insted of python.exe).


From python at bdurham.com  Fri Feb 27 09:40:27 2009
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 27 Feb 2009 09:40:27 -0500
Subject: ANN: updates to Python-by-example
In-Reply-To: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
Message-ID: <1235745627.24512.1302731601@webmail.messagingengine.com>

Rainy,

Great stuff! Thanks for your examples with the community!!

Regards,
Malcolm


From gnewsg at gmail.com  Fri Feb 27 09:48:20 2009
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Fri, 27 Feb 2009 06:48:20 -0800 (PST)
Subject: How can I know when a sub-process is effectively initialized?
References: <mailman.847.1235681981.11746.python-list@python.org>
Message-ID: <792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>

On 26 Feb, 21:59, Jean-Paul Calderone <exar... at divmod.com> wrote:
> On Thu, 26 Feb 2009 12:27:26 -0800 (PST), Giampaolo Rodola' <gne... at gmail.com> wrote:
> >Hi,
> >I'm working on a Python module called psutil [1] for reading process
> >information in a cross-platform way.
> >I'm having a problem with psutil test suite.
> >Almost all the test cases we implemented so far look like this:
>
> >def test_foo(self):
> > ? ?test_process = subprocess.Popen(sys.executable, stdout=DEVNULL,
> >stderr=DEVNULL)
> > ? ?time.sleep(0.1) ?# XXX: provisional, give some time the sub
> >process to initialize
> > ? ?p = psutil.Process(test_process.pid)
> > ? ?# start test here
> > ? ?...
>
> >As you can see we put a time.sleep(0.1) call after subprocess.Popen()
> >as a provisional workaround to let the sub process initialize
> >properly.
> >We're searching for some kind of way to know when the child process is
> >properly initialized so that we can actually start testing cases
> >without worries.
> >Does someone has an idea how could we do that?
>
> Hi Giampaolo,
>
> "Properly initialized" is application specific. ?Generally, what you want
> to do is have the child process tell you when it's ready. ?A common way
> to do this is for the child to write some bytes to a file descriptor the
> parent is monitoring when it is ready. ?The parent then just waits for
> those bytes. ?It looks like you entirely control the child in this case,
> so that should be possible here.
>
> Alternatively, maybe by "properly initialized" you mean something very
> specific about how subprocess.Popen creates processes. ?If so, can you
> elaborate a bit?
>
> Jean-Paul

By "properly initialized" I mean when I can actually start fetching
information from the process (e.g. name, path, parent pid, etc...).
Anyway, I came out with this solution:


def wait_for_pid(pid, timeout=1):
    """Wait for pid to show up in the process list then return.
    Used in the test suite to give time the sub process to initialize.
    """
    raise_at = time.time() + timeout
    while 1:
        if pid in psutil.get_pid_list():
            return
        time.sleep(0.0001)
        if time.time() >= raise_at:
            raise RuntimeError("Timed out")


def test_foo():
    proc = subprocess.Popen(PYTHON, stdout=DEVNULL, stderr=DEVNULL)
    wait_for_pid(proc.pid)
    ...


It seems to work fine on posix but we still got problems on Windows
where it seems that waiting for pid to show up in the system process
list is not enough for considering the process effectively
initialized.
Anyway, I think it's a problem in our code.
Thanks for your help, anyway.


--- Giampaolo
http://code.google.com/p/pyftpdlib


From mail at timgolden.me.uk  Fri Feb 27 09:54:10 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 27 Feb 2009 14:54:10 +0000
Subject: How can I know when a sub-process is effectively initialized?
In-Reply-To: <792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>
References: <mailman.847.1235681981.11746.python-list@python.org>
	<792949e0-f098-4262-96bf-2c99e2e708e2@a39g2000yqc.googlegroups.com>
Message-ID: <49A7FE92.2050705@timgolden.me.uk>

Giampaolo Rodola' wrote:
> It seems to work fine on posix but we still got problems on Windows
> where it seems that waiting for pid to show up in the system process
> list is not enough for considering the process effectively
> initialized.
> Anyway, I think it's a problem in our code.
> Thanks for your help, anyway.


On Windows, I'd just wait on a Windows event. The child process
sets it; the parent waits on it. If you need various of them,
the parent can pass a suitable id on the commandline to the
child. There are alternatives but this one is very easy to achieve.

TJG


From support.desk.ipg at gmail.com  Fri Feb 27 09:58:58 2009
From: support.desk.ipg at gmail.com (Support Desk)
Date: Fri, 27 Feb 2009 08:58:58 -0600
Subject: Capture Keystrokes from a USB Wireless Keyboard. 
In-Reply-To: <mailman.3364.1235745305.11745.python-list@python.org>
References: <mailman.3364.1235745305.11745.python-list@python.org>
Message-ID: <3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>



Does anybody know of a way to capture keystrokes form a wireless USB
keyboard using python?



From sgeiger at councilforeconed.org  Fri Feb 27 10:09:18 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Fri, 27 Feb 2009 10:09:18 -0500
Subject: Capture Keystrokes from a USB Wireless Keyboard.
In-Reply-To: <3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
References: <mailman.3364.1235745305.11745.python-list@python.org>
	<3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
Message-ID: <49A8021E.10200@councilforeconed.org>

Here's one option:

http://pykeylogger.sourceforge.net/wiki/index.php/PyKeylogger:FAQ                                                                                    



Support Desk wrote:
> Does anybody know of a way to capture keystrokes form a wireless USB
> keyboard using python?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From bearophileHUGS at lycos.com  Fri Feb 27 10:16:02 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 07:16:02 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
Message-ID: <9c2718dd-ee86-47d8-a47f-98c92b6a772e@d19g2000yqb.googlegroups.com>

Steve Holden:
> A sort of premature pessimization, then.

Maybe not, the save in memory may lead to higher speed anyway. So you
need to test it to know the overall balance. And in data structures
with general purpose you want all the speed you can get.

Bye,
bearophile


From support.desk.ipg at gmail.com  Fri Feb 27 10:19:35 2009
From: support.desk.ipg at gmail.com (Support Desk)
Date: Fri, 27 Feb 2009 09:19:35 -0600
Subject: Capture Keystrokes from a USB Wireless Keyboard.
In-Reply-To: <49A8021E.10200@councilforeconed.org>
References: <mailman.3364.1235745305.11745.python-list@python.org>
	<3C62F42D051F490FB51503F50DFEB282@office.ipglobal.net>
	<49A8021E.10200@councilforeconed.org>
Message-ID: <D29BF8FE0E334953B68FE51ACDA78A24@office.ipglobal.net>

Thanks, I'm looking for something I can integrate into a simple game I'm
working on that will run in Linux. 

-----Original Message-----
From: Shane Geiger [mailto:sgeiger at councilforeconed.org] 
Sent: Friday, February 27, 2009 9:09 AM
To: Support Desk
Cc: python-list at python.org
Subject: Re: Capture Keystrokes from a USB Wireless Keyboard.

Here's one option:

http://pykeylogger.sourceforge.net/wiki/index.php/PyKeylogger:FAQ




Support Desk wrote:
> Does anybody know of a way to capture keystrokes form a wireless USB
> keyboard using python?
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From vlastimil.brom at gmail.com  Fri Feb 27 10:19:55 2009
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 27 Feb 2009 16:19:55 +0100
Subject: starting a Python 2.5 executable without the DOS window
In-Reply-To: <228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com>
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
	<9fdb569a0902270621r279e7fb7kf75281d74a8415a2@mail.gmail.com>
	<228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com>
Message-ID: <9fdb569a0902270719y40e9d2c2m2385e5b75d94cfb1@mail.gmail.com>

>> 2009/2/27 Greg Miller <et1ssgmiller at gmail.com>:
>> > I am working on a program that controls a piece of equipment. ?The GUI/
>> > control software is written with Python2.5/wxPython. ?I would like to
>> > know if there is a way of starting the GUI without the DOS window
>> > having to launch? ?I would like only the application itself to appear,
>> > no DOS window. ?Thanks for any information.
>> > Greg Miller
>> > --

2009/2/27 Greg Miller <et1ssgmiller at gmail.com>:
> Sorry, I should have been a bit more specific, it is an executable, .exe,
> application created with PytoExe.
>

Ok, then you can adjust your setup script for py2exe to contain

setup(windows=["sourcefile.py"] ... )

instead of

setup(console=["sourcefile.py"] ...) which you probably have now.

hth,
  vbr


From digitig at gmail.com  Fri Feb 27 10:33:54 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 27 Feb 2009 15:33:54 +0000
Subject: removing duplication from a huge list.
In-Reply-To: <b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
Message-ID: <aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>

2009/2/27 odeits <odeits at gmail.com>:

> How big of a list are we talking about? If the list is so big that the
> entire list cannot fit in memory at the same time this approach wont
> work e.g. removing duplicate lines from a very large file.

We were told in the original question: more than 15 million records,
and it won't all fit into memory. So your observation is pertinent.

-- 
Tim Rowe


From steven.oldner at gmail.com  Fri Feb 27 10:35:08 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Fri, 27 Feb 2009 07:35:08 -0800 (PST)
Subject: ANN: updates to Python-by-example
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
	<mailman.903.1235745632.11746.python-list@python.org>
Message-ID: <49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>

On Feb 27, 8:40?am, pyt... at bdurham.com wrote:
> Rainy,
>
> Great stuff! Thanks for your examples with the community!!
>
> Regards,
> Malcolm

Let me add my thanks!  I using it now...


From stefan_ml at behnel.de  Fri Feb 27 10:38:31 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 27 Feb 2009 16:38:31 +0100
Subject: How to parse form in client side?
In-Reply-To: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
References: <d0575b38-3111-4bf7-aec7-a5b08da206e8@v39g2000yqm.googlegroups.com>
Message-ID: <49a808f7$0$32681$9b4e6d93@newsspool2.arcor-online.net>

Muddy Coder wrote:
> cgi module can easily acquire the all fields of data input from client
> side, through a form. Then, a simple line of code:
> 
> form_dict = cgi.FieldStorage()
> 
> grabs all data into a dictionary form_dict. The rest becomes a piece
> of cake by querying the form_dict. Nice!
> 
> However, it is done in the server side. Now I want to do the same in
> the client side. first of all, I get the source code of a HTML form by
> using urllib, from server, with code below:
> 
> html_source = urllib.urlopen(URL).read()
> 
> Then, I need to parse this html_source file, at client side. Is there
> a module to handle this? Can somebody help? Thanks!

lxml.html has good form handling support:

http://codespeak.net/lxml/lxmlhtml.html#forms

Stefan


From lilhedges69 at yahoo.com  Fri Feb 27 11:07:03 2009
From: lilhedges69 at yahoo.com (Brett Hedges)
Date: Fri, 27 Feb 2009 08:07:03 -0800 (PST)
Subject: Using xreadlines
In-Reply-To: <82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>
Message-ID: <830721.69929.qm@web30703.mail.mud.yahoo.com>


> You can also keep track of the absolute position of the lines in the file, etc, or step back looking for newlines, etc, but it's not handy.


How would I keep track of the absolute position of the lines? I have tried to use the files.seek() command with the files.tell() command and it does not seem to work. The files.tell() command seems to give me a number but when I use the files.next() command with xreadlines it does not change the line number the next time I use files.tell(). 

Thanks,

Brett

--- On Thu, 2/26/09, bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:

> From: bearophileHUGS at lycos.com <bearophileHUGS at lycos.com>
> Subject: Re: Using xreadlines
> To: python-list at python.org
> Date: Thursday, February 26, 2009, 8:09 PM
> Brett Hedges:
> > My question is how do I go to a previous line in the
> file? xreadlines has a file.next() statement that gives the
> next line, and I need a statement that gives me the previous
> line.<
> 
> In modern versions of Python you usually don't need
> xreadlines,
> because files are iterable.
> 
> If your files are small, you can just read all the lines in
> a list
> with open(...).readlines(), and then just use the item of
> the list
> with the n-1 index.
> 
> If the file is quite large or you like to keep things lazy,
> then you
> have to keep memory of the previous line, using an
> auxiliary variable.
> You can also wrap this idiom into a generator function (or
> iterable
> class, probably) that yields items and keeps memory of the
> last one
> (but you can't ask the previous of the first item, of
> course).
> 
> You can also keep track of the absolute position of the
> lines in the
> file, etc, or step back looking for newlines, etc, but
> it's not handy.
> 
> Bye,
> bearophile
> --
> http://mail.python.org/mailman/listinfo/python-list


      


From clp2 at rebertia.com  Fri Feb 27 11:43:15 2009
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 27 Feb 2009 08:43:15 -0800
Subject: Make a python property with the same name as the class member 
	name
In-Reply-To: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>
References: <fcf1e650-189f-4004-919c-2c0c03442ea4@e1g2000pra.googlegroups.com>
Message-ID: <50697b2c0902270843j5d0dce8flafcdd7b7494474b2@mail.gmail.com>

On Fri, Feb 27, 2009 at 5:59 AM, Ravi <ra.ravi.rav at gmail.com> wrote:
> Is it possible in python to create a property with the same name as
> the member variable name of the class. e.g.

No, because accessing the property and the instance variable are
*syntactically identical* (it's the raison detre of properties) so
there's no way for Python to know which one you mean when.
Typically, people name the variable used internally by the property as
an underscore followed by the property name (e.g. self._i).

> Class X:
> ? ?...
> ? ?self.i = 10 # marker
> ? ?...
> ? ?property(fget = get_i, fset = set_i)

Cheers,
Chris

-- 
Follow the path of the Iguana...
http://rebertia.com


From bearophileHUGS at lycos.com  Fri Feb 27 11:43:43 2009
From: bearophileHUGS at lycos.com (bearophileHUGS at lycos.com)
Date: Fri, 27 Feb 2009 08:43:43 -0800 (PST)
Subject: Using xreadlines
References: <mailman.910.1235750828.11746.python-list@python.org>
Message-ID: <cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>

Brett Hedges:
> How would I keep track of the absolute position of the lines?

You may have to do all things manually (tell, seek and looking for
newlines manually, iterating chars), that's why I have said it's not
handy. The other solutions are simpler.

Bye,
bearophile


From garrickp at gmail.com  Fri Feb 27 11:55:50 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 27 Feb 2009 08:55:50 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<mailman.909.1235748837.11746.python-list@python.org>
Message-ID: <50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>

On Feb 27, 8:33?am, Tim Rowe <digi... at gmail.com> wrote:
> 2009/2/27 odeits <ode... at gmail.com>:
>
> > How big of a list are we talking about? If the list is so big that the
> > entire list cannot fit in memory at the same time this approach wont
> > work e.g. removing duplicate lines from a very large file.
>
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.
>
> --
> Tim Rowe

If order did matter, and the list itself couldn't be stored in memory,
I would personally do some sort of hash of each item (or something as
simple as first 5 bytes, last 5 bytes and length), keeping a reference
to which item the hash belongs, sort and identify duplicates in the
hash, and using the reference check to see if the actual items in
question match as well.

Pretty brutish and slow, but it's the first algorithm which comes to
mind. Of course, I'm assuming that the list items are long enough to
warrant using a hash and not the values themselves.

~G


From mkhitrov at gmail.com  Fri Feb 27 12:00:50 2009
From: mkhitrov at gmail.com (Maxim Khitrov)
Date: Fri, 27 Feb 2009 12:00:50 -0500
Subject: What functions, other than sleep(), can be interrupted by Ctrl-C?
In-Reply-To: <op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
References: <26ddd1750902261017o7ec519ey2af03b1be2809cdb@mail.gmail.com>
	<op.upy700dqx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <26ddd1750902270900s5fc3d3aq3b8565acd2d95b98@mail.gmail.com>

On Thu, Feb 26, 2009 at 3:47 PM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
>> I'm looking for a function in the standard library or pywin32 package
>> that will block until a certain condition is met or it is interrupted
>> by Ctrl-C. For example, time.sleep() would have been perfect for my
>> needs if thread.interrupt_main() could interrupt the call from another
>> thread in the same way that Ctrl-C does. Unfortunately, that is not
>> the case.
>
> You may try MsgWaitForMultipleObjects - send a message to the main thread
> from the other thread.
> An alertable wait (like SleepEx) plus QueueUserAPC should work, I presume,
> but I've never actually tried in Python.

I tried using MsgWaitForMultipleObjects, but even with a wake mask of
0xffff Ctrl-C still did not interrupt the call. Maybe it has to do
with the way pywin32 implements it. QueueUserAPC is not available in
pywin32, but I suppose I can try getting to it via ctypes.

- Max


From starsareblueandfaraway at gmail.com  Fri Feb 27 12:03:38 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Fri, 27 Feb 2009 12:03:38 -0500
Subject: Using xreadlines
In-Reply-To: <cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>
References: <mailman.910.1235750828.11746.python-list@python.org>
	<cedf5c49-2ac3-4d7c-b50a-4b5de44acd30@j35g2000yqh.googlegroups.com>
Message-ID: <6a5569ec0902270903p1f2f6a54ta2bc7502565d3561@mail.gmail.com>

Brett,

I'm not sure what exactly you're trying to do, but you can keep track
of line numbers using itertools.

import itertools
for lineIndex, line in itertools.izip(itertools.count(1), open('text.txt')):
    print lineIndex, line


Here is sample code for breaking on a word and returning the previous line

def breakOnWord(filePath, word):
    previousLine = ''
    for line in open(filePath):
        if word in line:
            return previousLine
        previousLine = line



On Fri, Feb 27, 2009 at 11:43 AM,  <bearophileHUGS at lycos.com> wrote:
> Brett Hedges:
>> How would I keep track of the absolute position of the lines?
>
> You may have to do all things manually (tell, seek and looking for
> newlines manually, iterating chars), that's why I have said it's not
> handy. The other solutions are simpler.
>
> Bye,
> bearophile
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From steve at holdenweb.com  Fri Feb 27 12:07:41 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 12:07:41 -0500
Subject: removing duplication from a huge list.
In-Reply-To: <50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
Message-ID: <go96m9$t4i$1@ger.gmane.org>

Falcolas wrote:
> On Feb 27, 8:33 am, Tim Rowe <digi... at gmail.com> wrote:
>> 2009/2/27 odeits <ode... at gmail.com>:
>>
>>> How big of a list are we talking about? If the list is so big that the
>>> entire list cannot fit in memory at the same time this approach wont
>>> work e.g. removing duplicate lines from a very large file.
>> We were told in the original question: more than 15 million records,
>> and it won't all fit into memory. So your observation is pertinent.
>>
>> --
>> Tim Rowe
> 
> If order did matter, and the list itself couldn't be stored in memory,
> I would personally do some sort of hash of each item (or something as
> simple as first 5 bytes, last 5 bytes and length), keeping a reference
> to which item the hash belongs, sort and identify duplicates in the
> hash, and using the reference check to see if the actual items in
> question match as well.
> 
Assuming no duplicates, how does this help? You still have to verify
collisions.

> Pretty brutish and slow, but it's the first algorithm which comes to
> mind. Of course, I'm assuming that the list items are long enough to
> warrant using a hash and not the values themselves.
> 
The problem is you can't guarantee any hash value will be unique, so
ultimately you have to check whether list entries hashing to the same
value are or are not equal. Which would mean either having the whole
list in memory or having access to it via some other random access method.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From Scott.Daniels at Acm.Org  Fri Feb 27 12:20:19 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Fri, 27 Feb 2009 09:20:19 -0800
Subject: Using xreadlines
In-Reply-To: <mailman.910.1235750828.11746.python-list@python.org>
References: <mailman.910.1235750828.11746.python-list@python.org>
Message-ID: <MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>

(1) Please do not top post in comp.lang.python, it violates conventions.

Brett Hedges (should have written):
 > bearophile wrote: ...
>> You can also keep track of the absolute position of the lines in the file, etc, or step 
 >> back looking for newlines, etc, but it's not handy....
> 
> How would I keep track of the absolute position of the lines? 
 > I have tried to use the files.seek() command with the files.tell()
 > command and it does not seem to work. The files.tell() command seems
 >  to give me a number but when I use the files.next() command with
 > xreadlines it does not change the line number the next time I use
 > files.tell().

The answer to your question depends on what version of Python you are
running.  Give python version and platform to any question when you
don't _know_ they are irrelevant.

If you want an answer without any other input, try this:

The simplest way to solve this for the moment is (re)defining
xreadlines:

     def xreadlines(source):
         for line in iter(src.readline, ''):
             yield line

--Scott David Daniels
Scott.Daniels at Acm.Org


From patrick.oloughlin at gmail.com  Fri Feb 27 12:22:21 2009
From: patrick.oloughlin at gmail.com (Paddy O'Loughlin)
Date: Fri, 27 Feb 2009 17:22:21 +0000
Subject: Run a python script as an exe and run a new process from it
In-Reply-To: <e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>
References: <a35670a9-190b-4b48-bfdd-106194fb6d83@l39g2000yqn.googlegroups.com>
	<mailman.834.1235672099.11746.python-list@python.org>
	<e16f80cd-5f29-4d6e-ad5e-faf77a709c8e@n20g2000vba.googlegroups.com>
Message-ID: <cc34a9320902270922h5c15008n29cd76985aa787cf@mail.gmail.com>

2009/2/27 venutaurus539 at gmail.com <venutaurus539 at gmail.com>:
> Thanks for the reply,,
> ? ? ? ? ? ?I am trying to use the above application using psexec()in
> command line.But it failed returning the error message
>
> ?exited with error code 255.
>
> ? ? ? ? ? ? ?But when I ran the application normally it worked
> fine.Do I need to add anything to my python script(either the main one
> or the script which is calling it) to make it work.

I don't have any experience with psexec, so I'm not sure if I can help
you with that.
I assume this means that you are trying to run the script on a remote
computer? (Elsewise, why use psexec?)

I took a look at it though and it seems that it always exits with
*some* error code. I think it's more usual for that error code to be
zero, though (it does when I run it on my machine).

You might try "psexec start script1.py", which might work if you've
successfully set Explorer to run .py files with python.exe when you
double-click on them.

"psexec python script1.py" will work if the python.exe is in the correct path.

You can also specify the full path to your python.exe. if you know it
e.g.: "psexec C:\python25\python.exe script1.py"



-- 
"Ray, when someone asks you if you're a god, you say YES!"


From python.list at tim.thechases.com  Fri Feb 27 12:30:45 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 27 Feb 2009 11:30:45 -0600
Subject: removing duplication from a huge list.
In-Reply-To: <aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<aee48b3c0902270733w5555d5bcv450b0c72d32efd80@mail.gmail.com>
Message-ID: <49A82345.1040101@tim.thechases.com>

>> How big of a list are we talking about? If the list is so big that the
>> entire list cannot fit in memory at the same time this approach wont
>> work e.g. removing duplicate lines from a very large file.
> 
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.

Assuming the working set of unique items will still fit within 
memory, it can be done with the following regardless of the 
input-file's size:

   def deduplicator(iterable):
     seen = set()
     for item in iterable:
       if item not in seen:
         seen.add(item)
         yield item

   s = [7,6,5,4,3,6,9,5,4,3,2,5,4,3,2,1]
   print list(deduplicator(s))

   for line in deduplicator(file('huge_test.txt')):
     print line


It maintains order, emitting only new items as they're encountered.

-tkc





From ethan at stoneleaf.us  Fri Feb 27 12:34:11 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 27 Feb 2009 09:34:11 -0800
Subject: pep 8 constants
In-Reply-To: <go2fk5$bh6$1@ger.gmane.org>
References: <ef38762f0901132249p1ff6fa49v8ebefe2bb60d3ad9@mail.gmail.com>	<e1a84d570901132258q52c37071jb46de4cfd61644b9@mail.gmail.com>	<mailman.7178.1231918017.3487.python-list@python.org>	<pan.2009.01.14.08.13.30@REMOVE.THIS.cybersource.com.au>	<pan.2009.01.18.18.17.37.305157@virgilio.it>	<4978DD2E.1090008@aim.com>	<glbc6v$9eh$1@ger.gmane.org>	<49A49644.80509@stoneleaf.us>	<op.upv2d8t1x6zn5v@gabriel.sleipnir-bsas>
	<go2fk5$bh6$1@ger.gmane.org>
Message-ID: <49A82413.8080609@stoneleaf.us>

Steve Holden wrote:
> Gabriel Genellina wrote:
> 
>>En Tue, 24 Feb 2009 22:52:20 -0200, Ethan Furman <ethan at stoneleaf.us>
>>escribi?:
>>
>>
>>>Steve Holden wrote:
>>>
>>>>Brian Allen Vanderburg II wrote:
>>>>
>>>>
>>>>>One idea to make constants possible would be to extend properties to be
>>>>>able to exist at the module level as well as the class level:
>>>>>
>>>>>@property
>>>>>def pi():
>>>>>  return 3.14159.....
>>>>>
>>>>>print(pi) # prints 3.14159....
>>>>>pi=32 # Raise an error Cannot set attribute ...
>>>>>
>>>>
>>>> I don't understand why this would print 3.14159 ... instead of
>>>><function
>>>>__math__.pi>, or whatever.
>>>> property would clearly have to do something very different in module
>>>>scope in order to make this work.
>>>> regards
>>>> Steve
>>>
>>>--> class tester(object):
>>>...   @property
>>>...   def pi(self):
>>>...     return 3.141596
>>>...
>>>--> testee = tester()
>>>--> testee.pi
>>>3.1415959999999998
>>>
>>>Looks like that's how property works, so the same behavior on a module
>>>level would do as Brian suggests.
>>
>>Note that:
>> - you defined the property inside the *class* tester
>> - then, you created an *instance* of such class
>> - you retrieve pi from the instance
>> - if you retrieve pi from the class (tester.pi), you get a property
>>object, not a float.
>> - if you directly attach the property to the instance, testee.pi
>>returns a property object, not a float.
>>Finally, consider that modules are instances of type `module`; all
>>modules are instances of the same type.
>>
>>How do you propose to make properties work at the module level?
>>
> 
> Thanks, Gabriel. I was beginning to think there was something terribly
> obvious I had completely missed.
> 
> regards
>  Steve

Yes, Thanks, Gabriel!

You're extra comments made clarified the issue for me.  Much appreciated.

~Ethan~


From pcooke at philc.net  Fri Feb 27 12:35:06 2009
From: pcooke at philc.net (PhilC)
Date: Fri, 27 Feb 2009 12:35:06 -0500
Subject: Marching Cubes example
Message-ID: <v58gq4ho42jnej76ecq42fh9m7576gj41s@4ax.com>

Does anyone know of sample code showing how the marching cubes
algorithm may be implimented using Python?

Ref:- http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/

I can set up the cubes and test to see if their vertices are inside
the isosurface.

I can produce a resulting "metaball" but definition is poor and some
faces are reversed. (but not in any pattern that I can effectivly
debug).

My particular issues are:-

1) Finding the point at which the isosurface cuts the cube being
tested. Using a mid point produces poor results.

2) Getting the resulting triangular faces to all face outwards.

I'd prefer not to get into using VTK or matlab if possible.

Thanks :)



From digitig at gmail.com  Fri Feb 27 12:54:21 2009
From: digitig at gmail.com (Tim Rowe)
Date: Fri, 27 Feb 2009 17:54:21 +0000
Subject: removing duplication from a huge list.
In-Reply-To: <go96m9$t4i$1@ger.gmane.org>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
	<go96m9$t4i$1@ger.gmane.org>
Message-ID: <aee48b3c0902270954p45644757h508458910a8ffe8d@mail.gmail.com>

2009/2/27 Steve Holden <steve at holdenweb.com>:

> Assuming no duplicates, how does this help? You still have to verify
> collisions.
>
>> Pretty brutish and slow, but it's the first algorithm which comes to
>> mind. Of course, I'm assuming that the list items are long enough to
>> warrant using a hash and not the values themselves.
>>
> The problem is you can't guarantee any hash value will be unique, so
> ultimately you have to check whether list entries hashing to the same
> value are or are not equal. Which would mean either having the whole
> list in memory or having access to it via some other random access method.

You don't need random access to the whole list, just to the records
that collide on a hash. although you do end up using the external
storage as random access, which can be very slow, you've possibly
drastically reduced the number of such random accesses, which should
be a big saving. The best case is if the number of collisions is low
enough for the random access to be dealt with in buffering, avoiding
wasteful seeks of the external storage, in which case it's a complete
win. Remember that if the identical hashes are not collisions but
genuine duplicates you can throw them away as soon as they're checked,
so with some clever buffering you can stop them from clogging up the
buffer. The worst case is if there are a lot of genuine collisions, in
which case it's probably not a very good hash.

-- 
Tim Rowe


From daniel.watrous at gmail.com  Fri Feb 27 13:14:35 2009
From: daniel.watrous at gmail.com (Daniel)
Date: Fri, 27 Feb 2009 10:14:35 -0800 (PST)
Subject: starting a Python 2.5 executable without the DOS window
References: <40fb0b57-84de-406c-833a-8eaf3a0b921a@e1g2000pra.googlegroups.com>
	<9fdb569a0902270621r279e7fb7kf75281d74a8415a2@mail.gmail.com> 
	<228d17df0902270624i2a463b40u6c245077afe48a7c@mail.gmail.com> 
	<mailman.907.1235748001.11746.python-list@python.org>
Message-ID: <87db03a9-e384-4c33-9965-6f5c4f787b65@p11g2000yqe.googlegroups.com>

On Feb 27, 8:19?am, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:
> >> 2009/2/27 Greg Miller <et1ssgmil... at gmail.com>:
> >> > I am working on a program that controls a piece of equipment. ?The GUI/
> >> > control software is written with Python2.5/wxPython. ?I would like to
> >> > know if there is a way of starting the GUI without the DOS window
> >> > having to launch? ?I would like only the application itself to appear,
> >> > no DOS window. ?Thanks for any information.
> >> > Greg Miller
> >> > --
>
> 2009/2/27 Greg Miller <et1ssgmil... at gmail.com>:
>
> > Sorry, I should have been a bit more specific, it is an executable, .exe,
> > application created with PytoExe.
>
> Ok, then you can adjust your setup script for py2exe to contain
>
> setup(windows=["sourcefile.py"] ... )
>
> instead of
>
> setup(console=["sourcefile.py"] ...) which you probably have now.
>
> hth,
> ? vbr

Just giving it the .pyw extension also seems to work (as I remember)


From alecla at bluewin.ch  Fri Feb 27 13:39:55 2009
From: alecla at bluewin.ch (alex)
Date: Fri, 27 Feb 2009 10:39:55 -0800 (PST)
Subject: TextCtrl fully expanding at program start
References: <f3172f71-b5f8-4b8c-979e-3da4f9a7d78e@o11g2000yql.googlegroups.com>
	<mailman.902.1235744095.11746.python-list@python.org>
Message-ID: <ee63ccea-ed71-475d-a678-de53beca7733@z9g2000yqi.googlegroups.com>

On 27 Feb., 15:14, Vlastimil Brom <vlastimil.b... at gmail.com> wrote:
> 2009/2/27 alex <ale... at bluewin.ch>:
>
> > Hi all
> > I have a gridsizer consisting of two vertically stacked panels, one
> > with a StaticBox and the other with a TextCtrl.
> > I would like that the TextCtrl expands at program start fully to the
> > allocated panel size (lower panel of gridSizer).
> > Instead of like now, fully expanding in the width but not exapnding in
> > the height direction (two lines high).
> ...
>
> Hi,
> changing the proportion for adding the textctrl into the sizer to 1
> should expand it to the lower half of the panel.
>
> try changing:
> ? ? ? ? windowTwoSizer.Add(box2, 0, wx.ALL|wx.EXPAND, 0)
> TO:
> ? ? ? ? windowTwoSizer.Add(box2, 1, wx.ALL|wx.EXPAND, 0)
>
> Seehttp://www.wxpython.org/docs/api/wx.Sizer-class.html#Add
> for the options for adding into the sizer.
>
> hth
> ? ?vbr

Hi Vlastimil
I must have overlooked it. Too much reading and trying...
Thank you, it works perfect.

Regards Alex


From garrickp at gmail.com  Fri Feb 27 15:01:29 2009
From: garrickp at gmail.com (Falcolas)
Date: Fri, 27 Feb 2009 12:01:29 -0800 (PST)
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com> 
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org> 
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com> 
	<mailman.909.1235748837.11746.python-list@python.org>
	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>
	<mailman.914.1235754520.11746.python-list@python.org>
Message-ID: <364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>

On Feb 27, 10:07?am, Steve Holden <st... at holdenweb.com> wrote:
> Assuming no duplicates, how does this help? You still have to verify
> collisions.

Absolutely. But a decent hashing function (particularly since you know
quite a bit about the data beforehand) will have very few collisions
(theoretically no collisions, again since we know the data
beforehand).

> The problem is you can't guarantee any hash value will be unique, so
> ultimately you have to check whether list entries hashing to the same
> value are or are not equal. Which would mean either having the whole
> list in memory or having access to it via some other random access method.

Again, absolutely. But as Tim pointed out, with a decent hash the
number of superfluous checks should be minimal, so your checks will
mostly occur on valid duplicate values.

It's worth noting that I picked this algorithm with the assumption
that any storage to physical memory (such as required by using a set)
would be out of the question.

~G


From rpdooling at gmail.com  Fri Feb 27 15:04:15 2009
From: rpdooling at gmail.com (Rick Dooling)
Date: Fri, 27 Feb 2009 12:04:15 -0800 (PST)
Subject: Data Coding suggestions
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
Message-ID: <477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>

On Feb 27, 6:42?am, "steven.oldner" <steven.old... at gmail.com> wrote:
> Just learning Python and have a project to create a weekly menu and a
> shopping list from the menu. ?

> Question: ?How should I set up the data? ?I'm looking at maybe 70 menu
> items and maybe 1000 items for the shopping list. ?I need to be able
> to maintain each item also.
>

I agree with Mr. Holden. It's a perfect exercise for using Python with
sqlite3.

And the nice thing about this documentation is it has plenty of good
examples:

http://docs.python.org/library/sqlite3.html

Good luck,

RD


From starsareblueandfaraway at gmail.com  Fri Feb 27 15:04:43 2009
From: starsareblueandfaraway at gmail.com (Roy H. Han)
Date: Fri, 27 Feb 2009 15:04:43 -0500
Subject: Using xreadlines
In-Reply-To: <MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>
References: <mailman.910.1235750828.11746.python-list@python.org>
	<MMudnbHRtZKpvTXUnZ2dnUVZ_v7inZ2d@pdx.net>
Message-ID: <6a5569ec0902271204j39c86ff9hdf3464918d7a5d93@mail.gmail.com>

On Fri, Feb 27, 2009 at 12:20 PM, Scott David Daniels
<Scott.Daniels at acm.org> wrote:
> (1) Please do not top post in comp.lang.python, it violates conventions.
>
> Brett Hedges (should have written):
>> bearophile wrote: ...
>>>
>>> You can also keep track of the absolute position of the lines in the
>>> file, etc, or step
>
>>> back looking for newlines, etc, but it's not handy....
>>
>> How would I keep track of the absolute position of the lines?
>
>> I have tried to use the files.seek() command with the files.tell()
>> command and it does not seem to work. The files.tell() command seems
>> ?to give me a number but when I use the files.next() command with
>> xreadlines it does not change the line number the next time I use
>> files.tell().
>
> The answer to your question depends on what version of Python you are
> running. ?Give python version and platform to any question when you
> don't _know_ they are irrelevant.
>
> If you want an answer without any other input, try this:
>
> The simplest way to solve this for the moment is (re)defining
> xreadlines:
>
> ? ?def xreadlines(source):
> ? ? ? ?for line in iter(src.readline, ''):
> ? ? ? ? ? ?yield line
>
> --Scott David Daniels
> Scott.Daniels at Acm.Org
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Sorry for top-posting.
http://en.wikipedia.org/wiki/Posting_style


From steve at holdenweb.com  Fri Feb 27 15:31:51 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 15:31:51 -0500
Subject: removing duplication from a huge list.
In-Reply-To: <364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>	<50551f16-066d-4eac-a060-9d4c096f1480@v1g2000prd.googlegroups.com>	<mailman.914.1235754520.11746.python-list@python.org>
	<364a986d-ec91-4bd2-873b-9adf3701ba61@z6g2000pre.googlegroups.com>
Message-ID: <go9il6$8nl$1@ger.gmane.org>

Falcolas wrote:
> On Feb 27, 10:07 am, Steve Holden <st... at holdenweb.com> wrote:
>> Assuming no duplicates, how does this help? You still have to verify
>> collisions.
> 
> Absolutely. But a decent hashing function (particularly since you know
> quite a bit about the data beforehand) will have very few collisions
> (theoretically no collisions, again since we know the data
> beforehand).
> 
>> The problem is you can't guarantee any hash value will be unique, so
>> ultimately you have to check whether list entries hashing to the same
>> value are or are not equal. Which would mean either having the whole
>> list in memory or having access to it via some other random access method.
> 
> Again, absolutely. But as Tim pointed out, with a decent hash the
> number of superfluous checks should be minimal, so your checks will
> mostly occur on valid duplicate values.
> 
> It's worth noting that I picked this algorithm with the assumption
> that any storage to physical memory (such as required by using a set)
> would be out of the question.
> 
I take your point about the relatively rare collisions. Devising a
zero-collision algorithm is far from trivial, since at the minimum it
requires storing all hashes in a set to verify each new hash doesn't
collide with previous ones.

But unless you can *guarantee* zero collisions you do still need a
mapping from hash values to the original data, since this is the only
way to determine whether collisions represent a duplicate value or not.
That's not a trivial detail for fifteen million values, though it
depends some on the format of the OP's "records". I suppose a list of
file positions stored with each hash might be usable assuming either
fixed-length or properly delimited records.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From fredbasset1000 at gmail.com  Fri Feb 27 15:54:58 2009
From: fredbasset1000 at gmail.com (fredbasset1000 at gmail.com)
Date: Fri, 27 Feb 2009 12:54:58 -0800 (PST)
Subject: Define a constant in Python C extension
Message-ID: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>

I'm writing a C extension for Python, is it possible to define
constants in the C code and have them visible from Python?


From robert.kern at gmail.com  Fri Feb 27 16:03:39 2009
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 27 Feb 2009 15:03:39 -0600
Subject: Define a constant in Python C extension
In-Reply-To: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <go9kfc$eie$1@ger.gmane.org>

On 2009-02-27 14:54, fredbasset1000 at gmail.com wrote:
> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

In your init<module> function, create Python objects from the constants 
and insert them into the module using PyModule_AddObject(). The 
initspam() function in this section does this (though not with #defined 
constants):

http://docs.python.org/extending/extending.html#providing-a-c-api-for-an-extension-module

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though 
it had
  an underlying truth."
   -- Umberto Eco



From mwilson at the-wire.com  Fri Feb 27 16:15:18 2009
From: mwilson at the-wire.com (Mel)
Date: Fri, 27 Feb 2009 16:15:18 -0500
Subject: Define a constant in Python C extension
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <go9l4o$21nu$1@services.telesweet.net>

fredbasset1000 at gmail.com wrote:

> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

There's an API function to create a module-level name with a given value,
e.g.

PyModule_AddIntConstant (module, "S_IRUSR", S_IRUSR);   // user read

In this example, S_IRUSR was defined in one of the .h files for the
functions being wrapped.

        Mel.



From ntwrkd at gmail.com  Fri Feb 27 17:08:22 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Fri, 27 Feb 2009 14:08:22 -0800
Subject: Guidance on writing a top-like console
Message-ID: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>

I am interested in writing an application that functions like a Unix
or Linux top in the way it displays data.
It should be command-line based but dynamically refreshing.

I'm not sure what I should take into account or how I might go about
implementing this?
Any suggestions are appreciated.


From http  Fri Feb 27 17:18:36 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 14:18:36 -0800
Subject: removing duplication from a huge list.
References: <269329b40902261237j2815c8a2x80d7469abba1e1e6@mail.gmail.com>
	<loom.20090227T044929-209@post.gmane.org>
	<mailman.880.1235711744.11746.python-list@python.org>
	<b7193e1d-edab-4ae3-b060-57a77b9d2d6d@v1g2000prd.googlegroups.com>
	<mailman.909.1235748837.11746.python-list@python.org>
Message-ID: <7xprh3ikw3.fsf@ruckus.brouhaha.com>

Tim Rowe <digitig at gmail.com> writes:
> We were told in the original question: more than 15 million records,
> and it won't all fit into memory. So your observation is pertinent.

That is not terribly many records by today's standards.  The knee-jerk
approach is to sort them externally, then make a linear pass skipping
the duplicates.  Is the exercise to write an external sort in Python?
It's worth doing if you've never done it before.


From http  Fri Feb 27 17:19:24 2009
From: http (Paul Rubin)
Date: 27 Feb 2009 14:19:24 -0800
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <7xljrrikur.fsf@ruckus.brouhaha.com>

ntwrkd <ntwrkd at gmail.com> writes:
> I'm not sure what I should take into account or how I might go about
> implementing this?

Maybe the curses module.  http://docs.python.org/library/curses.html


From kyosohma at gmail.com  Fri Feb 27 17:20:27 2009
From: kyosohma at gmail.com (Mike Driscoll)
Date: Fri, 27 Feb 2009 14:20:27 -0800 (PST)
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <3cd95fd8-c975-425f-b01a-141bad52b408@q11g2000yqh.googlegroups.com>

On Feb 27, 4:08?pm, ntwrkd <ntw... at gmail.com> wrote:
> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.
>
> I'm not sure what I should take into account or how I might go about
> implementing this?
> Any suggestions are appreciated.

Perhaps you're looking for the curses module?

http://www.amk.ca/python/howto/curses/

Mike


From python.list at tim.thechases.com  Fri Feb 27 17:35:14 2009
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 27 Feb 2009 16:35:14 -0600
Subject: Guidance on writing a top-like console
In-Reply-To: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
References: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
Message-ID: <49A86AA2.30304@tim.thechases.com>

> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.

You might look at the sourcecode for "iotop"[1] which would make 
a good example (it's a "top"-like program written in Python, used 
for monitoring I/O transactions on a per-process basis)

-tkc


[1]
http://guichaz.free.fr/iotop/







From ntwrkd at gmail.com  Fri Feb 27 17:38:59 2009
From: ntwrkd at gmail.com (ntwrkd)
Date: Fri, 27 Feb 2009 14:38:59 -0800
Subject: Guidance on writing a top-like console
In-Reply-To: <49A86AA2.30304@tim.thechases.com>
References: <f257b9ab0902271408s14c67a48u5a356404afe3d3dd@mail.gmail.com>
	<49A86AA2.30304@tim.thechases.com>
Message-ID: <f257b9ab0902271438t11b948ablef40bc60e9246a3e@mail.gmail.com>

Thanks. These are all great suggestions.

On Fri, Feb 27, 2009 at 2:35 PM, Tim Chase
<python.list at tim.thechases.com> wrote:
>> I am interested in writing an application that functions like a Unix
>> or Linux top in the way it displays data.
>> It should be command-line based but dynamically refreshing.
>
> You might look at the sourcecode for "iotop"[1] which would make a good
> example (it's a "top"-like program written in Python, used for monitoring
> I/O transactions on a per-process basis)
>
> -tkc
>
>
> [1]
> http://guichaz.free.fr/iotop/
>
>
>
>
>
>


From mmcclaf at gmail.com  Fri Feb 27 18:39:13 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Fri, 27 Feb 2009 15:39:13 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
	<mailman.894.1235739864.11746.python-list@python.org>
Message-ID: <efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com>

This came in the Python groups, and I put one up in the database
group, since I will later have to use Python to access the SQL file,
so therefore tackling one thing at a time. Also, there were no answers
that were coming up in the .database group.

On top of that:
>        Really? You can have ships in the Outcomes relation that DO NOT
>APPEAR in the Ships relation... Goodbye referential integrity.
>
>        Besides which, if they don't appear in the Ships relation, then
>there is NO INFORMATION to tell you what ship CLASS it is a member of --
>do you group them all as "UNKNOWN" class, or do you declare each to be
>the only ship of its class (and thereby use the ship name as the class
>name)?

This meant that some ships weren't listed in the Ship table provided
but did show up in the Outcome. Therefore, they are not directly
referenced one to the other.

>        <sigh> Another gmail user found only by back referencing responses...

What is meant by this statement?

So in short of the responses given, I need to study further: GROUP BY,
HAVING, AS, COUNT, and subselect queries, right?

The relational algebra, I am able to translate it into SQL, or most of
it, meaning turning it into the queries of SQL. This is not an
advanced database course, but more a basic intro to database systems.


From vinay_sajip at yahoo.co.uk  Fri Feb 27 18:48:39 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 27 Feb 2009 15:48:39 -0800 (PST)
Subject: logging.Handler not working with QThreads
References: <mailman.776.1235606253.11746.python-list@python.org>
Message-ID: <d798715f-5a10-49e7-952c-62e4b3b2f6ac@33g2000yqm.googlegroups.com>

On Feb 25, 11:57?pm, Lukas Hetzenecker <L... at gmx.at> wrote:
> Hello,
>
> I created a QTextEdit where I wanted to display log messages.
> A logging.Handler should do this job.
>
> It worked with one thread well, but when I start a QThread the text on all
> widgets is removed and I get many errors in my konsole:
>
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
> ? Extension: ? ?152 (RENDER)
> ? Minor opcode: 25 (RenderCompositeGlyphs32)
> ? Resource id: ?0x0
>
> .. and so on
>
> I attatched a small example to this mail.
>
> Could anybody tell me what I'm doing wrong?
> Thanks for you help,
> Lukas
>
> ?logging_error.py
> 3KViewDownload

I'm not sure what exactly your problem is - I had no problem running a
slightly modified version of your script. I don't have a version of Qt
with a QPlainTextEdit, so I used a plain QTextEdit instead ('scuse the
play on words). I also modified the thread run method slightly, like
so...

   def run(self):
      s = self.currentThreadId()
      for i in range(10):
          self.log.info("Thread %s (%d)", s, i)
          self.sleep(1)

With these changes (and replacing the appendPlainText with just plain
append, the script worked fine. I was able to get messages from
multiple running threads and the main window/log window into the
single QTextEdit.

My testing was conducted on Kubuntu Hardy with SIP 4.7.9 and PyQt
4.4.4. The modified script is at

http://dpaste.com/hold/2947/

Best regards,

Vinay Sajip


From ethan at stoneleaf.us  Fri Feb 27 18:55:43 2009
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 27 Feb 2009 15:55:43 -0800
Subject: why cannot assign to function call
In-Reply-To: <slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
References: <mailman.6353.1230595599.3487.python-list@python.org>	<gjtj6a$8ud$1@ger.gmane.org>	<mailman.6612.1231183278.3487.python-list@python.org>	<01728080$0$8693$c3e8da3@news.astraweb.com>	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>	<01771716$0$8693$c3e8da3@news.astraweb.com>	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>	<0178651d$0$8693$c3e8da3@news.astraweb.com>	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
Message-ID: <49A87D7F.8090500@stoneleaf.us>

Mark Wooding wrote:
> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
 >
>>On the one hand, some people (me and possibly rurpy) consider "this is 
>>pass-by-foo" to be a statement about behaviour directly visible to the 
>>programmer. We have a set of behavioral traits in mind, and if a language 
>>exhibits those behaviours, then it is clearly and obviously pass-by-foo 
>>no matter how that behaviour is implemented. I'll call these the 
>>behaviorists.
> 
> Here's the problem.  I think I'm in that camp too!
> 
> I'm going to move away from the formal semantics stuff and try a
> different tack.  Here's what I think is the defining property of
> pass-by-value (distilled from the formal approach I described earlier,
> but shorn of the symbolism):
> 
>   The callee's parameters are /new variables/, initialized /as if by
>   assignment/ from the values of caller's argument expressions.
 >
> My soundbite definition for pass-by-reference is this:
> 
>   The callee's parameters are merely /new names/ for the caller's
>   argument variables -- as far as that makes sense.
> 
> There's a caveat there for argument expressions which don't correspond
> directly to variables -- and I've glossed over the issue of lvalue
> expressions which designate locations and all of that. 

Greetings, Mark!

A little background on myself, hopefully making my soon-to-follow 
question less idiotic.

I've been in the PC world for 20+ years now, and dabbled with 
programming through much of that time.  I've written small utilities in 
Assembly (x86) and CL (AS/400), I just recently wrote a dbf module for 
python, and I've studied (in and out of the classroom) C, Fortran, 
Pascal, Java, Perl, Php, and Basic.

While I have had some formal training, my degree is in Business (long 
story -- I would rather have done CS), and much of your explanation in 
previous posts was waaaaay over my head.

I am in complete agreement with Steven's description of the behaviorist 
point of view for pass-by-value and pass-by-reference, and if asked I 
would say Python is pass-by-object.  I offer this so you know where I'm 
coming from, not from any hostile motive.

I was hoping you might be able to clarify those last two sound bites for 
me -- I think I understand what you are saying, but I'm confused about 
how they relate to Python...

Specifically, how is a new name (pbr) different, in Python, from a new 
name initialized as if by assignment (pbv)?  It seems to me than you end 
up with the same thing in either case (in Python, at least), making the 
distinction non-existent.

def func(bar):
     bar.pop()

Pass-by-reference:
   foo = ['Ethan','Furman']
   func(foo)			# bar = foo

Pass-by-value:
   foo = ['Python','Rocks!']
   func(foo)			# bar is new name for foo
				# is this any different from above?

If I have this right, in both cases foo will be reduced to a single-item 
list after func.  Any further explanation you care to provide will be 
greatly appreciated!

~Ethan~


From rhodri at wildebst.demon.co.uk  Fri Feb 27 19:08:30 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 28 Feb 2009 00:08:30 -0000
Subject: why cannot assign to function call
In-Reply-To: <49A87D7F.8090500@stoneleaf.us>
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<gjtj6a$8ud$1@ger.gmane.org>
	<mailman.6612.1231183278.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<49A87D7F.8090500@stoneleaf.us>
Message-ID: <op.up1b0gf8a8ncjz@gnudebst>

On Fri, 27 Feb 2009 23:55:43 -0000, Ethan Furman <ethan at stoneleaf.us>  
wrote:

I'm not Mark, but you did post to the whole group!

[snippety snip]

> Specifically, how is a new name (pbr) different, in Python, from a new  
> name initialized as if by assignment (pbv)?  It seems to me than you end  
> up with the same thing in either case (in Python, at least), making the  
> distinction non-existent.
>
> def func(bar):
>      bar.pop()
>
> Pass-by-reference:
>    foo = ['Ethan','Furman']
>    func(foo)			# bar = foo
>
> Pass-by-value:
>    foo = ['Python','Rocks!']
>    func(foo)			# bar is new name for foo

With true pass-by-value, this comment is not true.  Bar would be a copy
of foo, not a new name.  What happens to bar is then not reflected in
foo (depending on how deep the copy is), which is the objective of
pass-by-value.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From vinay_sajip at yahoo.co.uk  Fri Feb 27 19:29:05 2009
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 27 Feb 2009 16:29:05 -0800 (PST)
Subject: logging.Handler not working with QThreads
References: <mailman.776.1235606253.11746.python-list@python.org>
Message-ID: <fa1962be-dcd3-42c0-b6ea-ab78bff4703f@j39g2000yqn.googlegroups.com>

On Feb 25, 11:57 pm, Lukas Hetzenecker <L... at gmx.at> wrote:
> Hello,
>
> I created a QTextEdit where I wanted to display log messages.
> A logging.Handler should do this job.
>
> It worked with one thread well, but when I start a QThread the text on all
> widgets is removed and I get many errors in my konsole:
>
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
> X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
>   Extension:    152 (RENDER)
>   Minor opcode: 25 (RenderCompositeGlyphs32)
>   Resource id:  0x0
>
> .. and so on
>
> I attatched a small example to this mail.
>
> Could anybody tell me what I'm doing wrong?
> Thanks for you help,
> Lukas
>
>  logging_error.py
> 3KViewDownload

Google seems to have swallowed my first attempt to reply, trying
again...

The following slightly modified script

http://dpaste.com/hold/2947/

seems to work as expected (see screenshot at
http://i722.photobucket.com/albums/ww224/vsajip/screenshot.png)

I just changed the script because my KDE doesn't have QPlainTextEdit,
so I used just plain QTextEdit instead. I also modified the thread run
method to loop over 10 seconds, so that I could show multiple threads
interleaving their output with messages from main window/log window.

Tested on Kubuntu (Hardy, KDE3) with SIP 4.7.9 and PyQt 4.4.4 running
on Qt 4.3.4.

Regards,

Vinay Sajip


From wuwei23 at gmail.com  Fri Feb 27 22:17:23 2009
From: wuwei23 at gmail.com (alex23)
Date: Fri, 27 Feb 2009 19:17:23 -0800 (PST)
Subject: Guidance on writing a top-like console
References: <mailman.921.1235772504.11746.python-list@python.org>
Message-ID: <f3201f29-e7f3-4060-9eb6-04042e006b4f@z6g2000pre.googlegroups.com>

On Feb 28, 8:08?am, ntwrkd <ntw... at gmail.com> wrote:
> I am interested in writing an application that functions like a Unix
> or Linux top in the way it displays data.
> It should be command-line based but dynamically refreshing.
>
> I'm not sure what I should take into account or how I might go about
> implementing this?
> Any suggestions are appreciated.

Urwid is a Python console UI lib and is definitely what I'd turn to
for something like this:

http://excess.org/urwid/


From sammo2828 at gmail.com  Fri Feb 27 22:21:53 2009
From: sammo2828 at gmail.com (Sammo)
Date: Fri, 27 Feb 2009 19:21:53 -0800 (PST)
Subject: What's so wrong about execfile?
Message-ID: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>

Given that execfile has been removed in py3k, I want to understand
exactly why.

Okay, I get that execfile is bad from the following thread:

On Jul 29 2007, 2:39 pm, Steven D'Aprano
<st... at REMOVE.THIS.cybersource.com.au> wrote:
> (1) Don't use eval, exec or execfile.
>
> (2) If you're an expert, don't use eval, exec or execfile.
>
> (3) If you're an expert, and are fully aware of the security risks, don't
> use eval, exec or execfile.
>
> (4) If you're an expert, and are fully aware of the security risks, and
> have a task that can only be solved by using eval, exec or execfile, find
> another solution.
>
> (5) If there really is no other solution, you haven't looked hard enough.
>
> (6) If you've looked REALLY hard, and can't find another solution, AND
> you're an expert and are fully aware of the security risks, THEN you can
> think about using eval, exec or execfile.

What are some of the reasons why execfile should not be used?

What are some examples of cases where execfile is the correct way of
doing something?


From steve at holdenweb.com  Fri Feb 27 23:09:36 2009
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 27 Feb 2009 23:09:36 -0500
Subject: Queries
In-Reply-To: <goacjs$8cd$1@ger.gmane.org>
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>	<mailman.894.1235739864.11746.python-list@python.org>	<efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com>
	<goacjs$8cd$1@ger.gmane.org>
Message-ID: <goadfl$9i0$1@ger.gmane.org>

Dennis Lee Bieber wrote:
> On Fri, 27 Feb 2009 15:39:13 -0800 (PST), mmcclaf <mmcclaf at gmail.com>
> declaimed the following in gmane.comp.python.general:
> 
>> This came in the Python groups, and I put one up in the database
>> group, since I will later have to use Python to access the SQL file,
[...]
>> The relational algebra, I am able to translate it into SQL, or most of
> 
> ... and formal relational algebra is a notation many users of database
> engines like MySQL, SQLite, Access/JET, Visual FoxPro, Paradox, Sybase,
> etc. have never encountered -- heck, Access tries to hide SQL from the
> user via a form of QBE interface.
> 
> 	If I were to attempt a textual version of relational algebra, you'd
> be getting something on the order of:
> 
> t1 = Ships x Classes
> t2 = restrict t1(Ships.class = Classes.class)
> res = project t2(Ships.name, Classes.class, Classes.country)
> 
> instead of straight forward SQL
> 
> select Ships.name, Classes.class, Classes.country from Ships
> 	inner join Classes
> 		on Ships.class = Classes.class
> 
> 
I think the real problem is that the database design the OP is using os
far from normalized. This will tend to contort the logic, as well as
making the programming harder to understand.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/



From pavlovevidence at gmail.com  Sat Feb 28 00:15:15 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Fri, 27 Feb 2009 21:15:15 -0800 (PST)
Subject: What's so wrong about execfile?
References: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>
Message-ID: <c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>

On Feb 27, 7:21?pm, Sammo <sammo2... at gmail.com> wrote:
> Given that execfile has been removed in py3k, I want to understand
> exactly why.
>
> Okay, I get that execfile is bad from the following thread:
>
> On Jul 29 2007, 2:39 pm, Steven D'Aprano
>
>
>
> <st... at REMOVE.THIS.cybersource.com.au> wrote:
> > (1) Don't use eval, exec or execfile.
>
> > (2) If you're an expert, don't use eval, exec or execfile.
>
> > (3) If you're an expert, and are fully aware of the security risks, don't
> > use eval, exec or execfile.
>
> > (4) If you're an expert, and are fully aware of the security risks, and
> > have a task that can only be solved by using eval, exec or execfile, find
> > another solution.
>
> > (5) If there really is no other solution, you haven't looked hard enough.
>
> > (6) If you've looked REALLY hard, and can't find another solution, AND
> > you're an expert and are fully aware of the security risks, THEN you can
> > think about using eval, exec or execfile.
>
> What are some of the reasons why execfile should not be used?
>
> What are some examples of cases where execfile is the correct way of
> doing something?

You didn't quote the context of Steven's reply, so I don't know if he
was talking in general, or for a particular situation.  I suspect it
was the latter, though.

Anyway, there is one generally valid use case for these three: when
it's your deliberate intention to give the user the power to run
arbitrary Python code.  If you really want to give the user this
power, and the user is trusted on whatever machine they are running it
on, go ahead and use it.  No apology necessary.

[For instance, the package I use to generate my web site uses exec and
eval, because it processes templates with embedded Python code.  It's
all generated statically, on my own desktop, and I author all the
pages myself, so there is no security risk.  If I were to distribute
this package (and I do, though not many people use it, because
everyone just writes their own HTML templates), there would be no risk
because the user is expected to be able to run Python, and if they can
be trusted to run Python on their own system, they can be trusted to
run my program, which execs templates that they write themselves.]

I would suggest, however, that even if that is your intention that you
consider leveraging Python's built-in import infrastructure.  Instead
of execfile, you could have your program simply import a module the
user writes (after adding a user-specific directory to sys.path).


Now, here are a few situations where you should follow Steven's advice
above (i.e., don't, ever):

- Don't ever use exec or eval to construct a variable name
dynamically.  Don't ever do this, for instance:

x = eval("self","%s%d" % (name,index))

This is unforgiveable.  Python has better and safer ways to do this
(use getattr, setattr, globals, and locals built-ins).  And if you
find yourself using them a lot, it's a red flag that you should be
using dicts instead.

- Don't ever pass any data to exec or eval that you didn't either
write, or thoroughly inspect, yourself.  Especially don't pass it any
data you received over the network.  You have to be the super extreme
expert that Steven described, and own a lot of liability insurance,
befor you can do that.


Carl Banks


From zaheer.agadi at gmail.com  Sat Feb 28 00:17:41 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Fri, 27 Feb 2009 21:17:41 -0800 (PST)
Subject: what does this mean....?
Message-ID: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>

I am trying to download a file from the server, I am getting this
error,what does this mean

   localFile = open(localFileName, 'wb')
TypeError: coercing to Unicode: need string or buffer, type found



From python at rcn.com  Sat Feb 28 00:26:44 2009
From: python at rcn.com (Raymond Hettinger)
Date: Fri, 27 Feb 2009 21:26:44 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com> 
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
Message-ID: <0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>

[Steve Holden]
> A sort of premature pessimization, then.

QOTW!

 _ ~
 @ @
 \_/


Raymond



From sjmachin at lexicon.net  Sat Feb 28 00:50:27 2009
From: sjmachin at lexicon.net (John Machin)
Date: Fri, 27 Feb 2009 21:50:27 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
Message-ID: <b81b2932-51a9-43e3-83df-2df2040aee18@v1g2000prd.googlegroups.com>

On Feb 28, 4:17?pm, zaheer.ag... at gmail.com wrote:
> I am trying to download a file from the server, I am getting this
> error,what does this mean
>
> ? ?localFile = open(localFileName, 'wb')
> TypeError: coercing to Unicode: need string or buffer, type found

the name localFileName is bound to a type ... and of course it's
expecting a string.

You must have done something weird with localFileName, like this:

| >>> fname = type(2)
| >>> fname
| <type 'int'>
| >>> f = open(fname)
| Traceback (most recent call last):
|   File "<stdin>", line 1, in <module>
| TypeError: coercing to Unicode: need string or buffer, type found
| >>>


From rhodri at wildebst.demon.co.uk  Sat Feb 28 00:50:38 2009
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sat, 28 Feb 2009 05:50:38 -0000
Subject: what does this mean....?
In-Reply-To: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
Message-ID: <op.up1ruodca8ncjz@gnudebst>

On Sat, 28 Feb 2009 05:17:41 -0000, <zaheer.agadi at gmail.com> wrote:

> I am trying to download a file from the server, I am getting this
> error,what does this mean
>
>    localFile = open(localFileName, 'wb')
> TypeError: coercing to Unicode: need string or buffer, type found

The rest of the traceback and enough of your code to make sense of
it would have helped.  Without context, my best guess is that
"localFileName" isn't actually a string.

-- 
Rhodri James *-* Wildebeeste Herder to the Masses


From ken at seehart.com  Sat Feb 28 01:06:26 2009
From: ken at seehart.com (Ken Seehart)
Date: Fri, 27 Feb 2009 22:06:26 -0800
Subject: How do I count the distance between strings in a list?
In-Reply-To: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
References: <05e9fe5f-f0ea-475f-b8f6-b9e6c99f3c21@t11g2000yqg.googlegroups.com>
Message-ID: <49A8D462.1090108@seehart.com>

collin wrote:
> For example, if I were to have the code
>
> randomlist = ["1", "2", "3", "4"]
>
> And I want to count the distance between strings "1" and "4" which is
> 3, what command can I use to do this?
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   
randomlist.index("4") - randomlist.index("1")

Ken



From stefan_ml at behnel.de  Sat Feb 28 01:38:41 2009
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 28 Feb 2009 07:38:41 +0100
Subject: Define a constant in Python C extension
In-Reply-To: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
References: <22eda701-7048-458c-9e56-80bafbbcb81f@z6g2000pre.googlegroups.com>
Message-ID: <49a8dbf1$0$32679$9b4e6d93@newsspool2.arcor-online.net>

fredbasset1000 at gmail.com wrote:
> I'm writing a C extension for Python, is it possible to define
> constants in the C code and have them visible from Python?

Have you looked at Cython? It allows you to define e.g. enums as "public"
and will generate the rest for you.

http://cython.org

Stefan


From zaheer.agadi at gmail.com  Sat Feb 28 01:44:28 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Fri, 27 Feb 2009 22:44:28 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
Message-ID: <cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>

On Feb 28, 10:50 am, "Rhodri James" <rho... at wildebst.demon.co.uk>
wrote:
> On Sat, 28 Feb 2009 05:17:41 -0000, <zaheer.ag... at gmail.com> wrote:
> > I am trying to download a file from the server, I am getting this
> > error,what does this mean
>
> >    localFile = open(localFileName, 'wb')
> > TypeError: coercing to Unicode: need string or buffer, type found
>
> The rest of the traceback and enough of your code to make sense of
> it would have helped.  Without context, my best guess is that
> "localFileName" isn't actually a string.
>
> --
> Rhodri James *-* Wildebeeste Herder to the Masses

Ohh thats my bad, I was actually  passing  a file type instead of
string,thanks a lot .
One question off the topic.,
How to create a .pyz file. I have python project that has some modules
in it , I want to create a zip file so that I can use it as we use
java jar file
Like I want to do a
mypyFiles.pyz --sendFile C:\\testFile
I currently have a module that does this when run as single python
module, but I want to do same this using a zip file which will  have
some other modules within it.

Any help..?

Thanks



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 03:31:00 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 06:31:00 -0200
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
Message-ID: <op.up1y9yf7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.agadi at gmail.com> escribi?:

> One question off the topic.,

Usually it's better to post a separate message.

> How to create a .pyz file. I have python project that has some modules
> in it , I want to create a zip file so that I can use it as we use
> java jar file
> Like I want to do a
> mypyFiles.pyz --sendFile C:\\testFile
> I currently have a module that does this when run as single python
> module, but I want to do same this using a zip file which will  have
> some other modules within it.

Just put all your modules inside the zip, and create a __main__.py file.  
Execute it using:

	python foo.zip

See http://docs.python.org/using/cmdline.html#command-line

-- 
Gabriel Genellina



From goodz158 at yahoo.com  Sat Feb 28 03:41:41 2009
From: goodz158 at yahoo.com (Good Z)
Date: Sat, 28 Feb 2009 00:41:41 -0800 (PST)
Subject: Issues using SOAP/WSDL with HTTPS
References: <415de41f-418a-4f21-97b7-6037a095ccc1@k1g2000prb.googlegroups.com>
	<4960d898$0$30239$9b4e6d93@newsspool1.arcor-online.net>
	<4960e88d$0$28676$7a628cd7@news.club-internet.fr>
Message-ID: <331921.78646.qm@web35902.mail.mud.yahoo.com>

Hello all, 
I am new to SOAP/WebServices and getting error when using HTTPS with it. Any  help is appreciated. here is what i am doing:


import xml 
import fpconst 
import SOAPpy 
from SOAPpy import WSDL 
wsdlFile = 'https://xxxx..com/webService.wsdl' 
server = WSDL.Proxy(wsdlFile) 


It seems the WSDL file has been read but when it tried to GET the XSD file that is there in WSDL file, we get following error. 


  File "<stdin>", line 1, in <module>
  File "/var/lib/python-support/python2.5/SOAPpy/WSDL.py", line 62, in __init__
    self.wsdl = reader.loadFromStream(stream, wsdlsource)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/WSDLTools.py", line 34, in loadFromStream
    wsdl.load(document)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/WSDLTools.py", line 260, in load
    schema = reader.loadFromNode(WSDLToolsAdapter(self), item)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 80, in loadFromNode
    schema.load(reader)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 1088, in load
    self.addImportSchema(tp.getSchema())
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 1205, in getSchema
    self._schema = reader.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 111, in loadFromURL
    reader.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/XMLSchema.py", line 266, in loadFromURL
    self.__node = DOM.loadFromURL(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/Utility.py", line 614, in loadFromURL
    file = urlopen(url)
  File "/var/lib/python-support/python2.5/SOAPpy/wstools/Utility.py", line 155, in urlopen
    response = conn.getresponse()
  File "/usr/lib/python2.5/httplib.py", line 931, in getresponse
    response.begin()
  File "/usr/lib/python2.5/httplib.py", line 388, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.5/httplib.py", line 352, in _read_status
    raise BadStatusLine(line)


Regards,
Mike



      
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From bignose+hates-spam at benfinney.id.au  Sat Feb 28 03:50:59 2009
From: bignose+hates-spam at benfinney.id.au (Ben Finney)
Date: Sat, 28 Feb 2009 19:50:59 +1100
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
	<mailman.931.1235809891.11746.python-list@python.org>
Message-ID: <87wsbbaqrw.fsf@benfinney.id.au>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.agadi at gmail.com> escribi?:
> 
> > One question off the topic.,
> 
> Usually it's better to post a separate message.

More specifically (and I only say this because many people seem not to
observe the distinction), when starting an entirely new topic of
discussion, you should not reply to an existing message since it's
then confusingly related with the same thread; instead, compose a
*new* message with the appropriate subject.

-- 
 \           ?Either he's dead or my watch has stopped.? ?Groucho Marx |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From zaheer.agadi at gmail.com  Sat Feb 28 04:13:52 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 01:13:52 -0800 (PST)
Subject: what does this mean....?
References: <5dbba95b-de47-4ba6-bcd1-e5198fbaa13f@v19g2000yqn.googlegroups.com>
	<mailman.929.1235800244.11746.python-list@python.org>
	<cbf26627-4ee8-49ac-b0ef-0ef10a37bbe9@x13g2000yqf.googlegroups.com>
	<mailman.931.1235809891.11746.python-list@python.org>
	<87wsbbaqrw.fsf@benfinney.id.au>
Message-ID: <3826c1e5-6e6c-4c77-bf6f-381739654dd7@33g2000yqm.googlegroups.com>

On Feb 28, 1:50 pm, Ben Finney <bignose+hates-s... at benfinney.id.au>
wrote:
> "Gabriel Genellina" <gagsl-... at yahoo.com.ar> writes:
> > En Sat, 28 Feb 2009 04:44:28 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> > > One question off the topic.,
>
> > Usually it's better to post a separate message.
>
> More specifically (and I only say this because many people seem not to
> observe the distinction), when starting an entirely new topic of
> discussion, you should not reply to an existing message since it's
> then confusingly related with the same thread; instead, compose a
> *new* message with the appropriate subject.
>
> --
>  \           ?Either he's dead or my watch has stopped.? ?Groucho Marx |
>   `\                                                                   |
> _o__)                                                                  |
> Ben Finney

I agree I should have posted a new topic, Point taken..
Thanks Gabriel ,I will try this if  could not get this to work will
post a new thread.


From jineu21 at hotmail.com  Sat Feb 28 05:15:37 2009
From: jineu21 at hotmail.com (Clarendon)
Date: Sat, 28 Feb 2009 02:15:37 -0800 (PST)
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com> 
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com> 
	<go8opf$pd$4@ger.gmane.org>
	<mailman.900.1235742411.11746.python-list@python.org>
Message-ID: <9d9282b1-4d5f-48bd-99d4-3bd5c23b52e1@o36g2000yqh.googlegroups.com>

Thank you very much for all your replies. I actually used the while
loop as the data is not large. But I was looking for a simpler, built
in command, something like L.remove('a', all) or L.removeall('a').
Python has re.findall function, but why not removeall, so users have
to make up long lines of expression?


From nick at craig-wood.com  Sat Feb 28 05:30:04 2009
From: nick at craig-wood.com (Nick Craig-Wood)
Date: Sat, 28 Feb 2009 04:30:04 -0600
Subject: Using xreadlines
References: <mailman.865.1235695165.11746.python-list@python.org>
	<82c7db91-fb61-491e-9ff5-38761c3424e9@g38g2000yqd.googlegroups.com>
Message-ID: <slrngqi1o4.2ms.nick@irishsea.home.craig-wood.com>

bearophileHUGS at lycos.com <bearophileHUGS at lycos.com> wrote:
>  Brett Hedges:
> > My question is how do I go to a previous line in the file? xreadlines has a file.next() statement that gives the next line, and I need a statement that gives me the previous line.<
> 
>  In modern versions of Python you usually don't need xreadlines,
>  because files are iterable.
> 
>  If your files are small, you can just read all the lines in a list
>  with open(...).readlines(), and then just use the item of the list
>  with the n-1 index.

There is also the linecache module

  http://docs.python.org/library/linecache.html

Which may be useful...

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick


From python at bdurham.com  Sat Feb 28 08:12:39 2009
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 28 Feb 2009 08:12:39 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<5a96c945-7b61-4dba-af20-a324fd3b3394@z9g2000yqi.googlegroups.com>
	<7xfxi08da9.fsf@ruckus.brouhaha.com>
	<3d0a5145-2202-418a-97cc-cbe9c04def16@h5g2000yqh.googlegroups.com>
	<mailman.895.1235740175.11746.python-list@python.org>
	<0cde26ce-4fa8-4975-961a-ab4e4512715a@i2g2000prd.googlegroups.com>
Message-ID: <1235826759.2954.1302874671@webmail.messagingengine.com>


>> A sort of premature pessimization, then.

QOTW!

+1

Malcolm


From mdw at distorted.org.uk  Sat Feb 28 08:54:40 2009
From: mdw at distorted.org.uk (Mark Wooding)
Date: Sat, 28 Feb 2009 13:54:40 +0000
Subject: why cannot assign to function call
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
Message-ID: <87myc6oee7.fsf.mdw@metalzone.distorted.org.uk>

Ethan Furman <ethan at stoneleaf.us> writes:

> Mark Wooding wrote:
>> Here's what I think is the defining property of pass-by-value [...]:
>>
>>   The callee's parameters are /new variables/, initialized /as if by
>>   assignment/ from the values of caller's argument expressions.
>>
>> My soundbite definition for pass-by-reference is this:
>>
>>   The callee's parameters are merely /new names/ for the caller's
>>   argument variables -- as far as that makes sense.
>
> Greetings, Mark!

You posted to the whole group -- probably using a wide-reply option
while reading the mailing list.  Still, I'll give an answer here in
order to help any other readers of the list or newsgroup.  However, as
far as I'm concerned, this discussion is basically at an end and I'm not
really interested in starting it up all over again.  To that end, I've
set followups to `poster'.  I shall continue reply to private email
which seems interested in a sensible discussion.

> I was hoping you might be able to clarify those last two sound bites
> for me -- I think I understand what you are saying, but I'm confused
> about how they relate to Python...
>
> Specifically, how is a new name (pbr) different, in Python, from a new
> name initialized as if by assignment (pbv)?  It seems to me than you
> end up with the same thing in either case (in Python, at least),
> making the distinction non-existent.

You've missed a level of indirection.  In particular, `names' aren't
things that you initialize.  They're things that you /bind/ to
variables.  The crucial difference is that, in pass-by-value, new
variables are created as an intrinsic part of the process, whereas in
pass-by-reference, new variables are not (usually) created, and instead
the formal parameter names are bound to the caller's pre-existing
argument variables.

It's worth noting that I use the terms `name' and `binding' in different
ways from most of the Python community.  This is unfortunate.  The
discrepancy is actually because the Python meanings of these words are
not the same as the meanings in the wider computer science and
mathematical communities.  For example, many Python users seem to use
`binding' to mean `assignment', which is a shame because it leaves the
concept that is usually called `binding' without a name.  So I'll stick
with the wider meanings.

A while ago, I posted an essay -- to this group -- which may help
explain the concepts:

        Message-ID: <8763k14nc6.fsf.mdw at metalzone.distorted.org.uk>
        http://groups.google.com/group/comp.lang.python/msg/f6f1a321f819d02b

On with the question.

> def func(bar):
>     bar.pop()
>
> Pass-by-reference:
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo
>
> Pass-by-value:
>   foo = ['Python','Rocks!']
>   func(foo)			# bar is new name for foo
> 				# is this any different from above?
>
> If I have this right, in both cases foo will be reduced to a
> single-item list after func.  

You're correct.  So: we can conclude that the above test is not
sufficient to distinguish the two cases.

> Any further explanation you care to provide will be greatly
> appreciated!

This test is sufficient to distinguish:

        def test(x):
          x = 'clobbered'

        y = 'virgin'
        test(y)
        print y

If it prints `virgin' then you have call-by-value.  If it prints
`clobbered' then you have call-by-reference.

Let's examine the two cases, as I did in the essay I cited above.  I'll
do call-by-value first.  First, we define a function `test'.  Then, we
initialize `y'.  It's worth examining this process in detail.  The name
`y' is initially unbound. so it is implicitly bound to a fresh
variable.  Then, (a reference to) the string object 'virgin' is stored
in this variable.  We can show this diagrammatically as follows.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

(In the diagrams, ===> denotes a binding relationship, between names and
variables; and ---> denotes a reference relationship, between variables
and values.)

Next, we call the `test' function.  Call-by-value says that we must
evaluate the argument expressions.  There's only one: `x'.  The value of
a name is obtained by (a) finding which variable is bound to the name,
and (b) extracting the value from this variable.  Well, the variable is
the one we just bound, and the value stored is (the reference to) the
string 'virgin'.  So the result of evaluating the argument expressions
is simply (the reference to) that string.

The function has one parameter, `y'.  A new environment is constructed
by extending the global environment.  In this new environment, the name
`y' is bound to a fresh variable -- distinct from all others, and
especially from the variable bound to `x' -- and in that variable we
store the value of the corresponding argument expression.  Result: the
function body is executed in an environment which is like the global
environment except that `y' is bound to a fresh variable containing
'virgin'.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'
                                                  ^
                                                  |
        x (in function `test') ====> [VAR] -------'

Now there's an assignment

          x = 'clobbered'

The name `x' is already bound to a variable.  So we modify that variable
so that it stores (a reference to) the string 'clobbered'.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

        x (in function `test') ====> [VAR] ---> 'clobbered'

And then the function ends.  The environment we constructed is
forgotten.  The variable bound to `x' is lost forever, since it wasn't
bound to any other name.  Since modifying that variable was the only
action carried out in the function, and the variable is now lost, there
is no externally observable effect.  When we finally print `y', we see
`virgin', because the variable bound to `y' was unchanged.

        y (in global env.)  ====>  [VAR]  ---> 'virgin'

So much for call-by-value.  How about call-by-reference?  Well,
everything is the same until the actual call.  But then everything
changes.

Firstly, call-by-reference /doesn't/ evaluate the argument expressions.
Instead, we just note that `y' is bound to a particular variable in the
global environment.  The function has a single parameter `x'.  A new
environment is constructed by extending the global environment (again):
in this new environment, the name `x' is bound to /the same variable/
that `y' is bound to in the global environment.

        y (in global env.)  ====>  [VAR]  <===== x (in function `test')
                                     |
                                     |
                                     v
                                 'virgin'

Now we assign to `x'.  The detailed rules are the same: `x' is bound, so
we modify the variable it's bound to, so that it stores 'clobbered'.
But this time, the variable being clobbered is the /same/ variable that
`y' is bound to.  So finally, when we print `y', we see the string
'clobbered.


        y (in global env.)  ====>  [VAR]  <===== x (in function `test')
                                     |
                                     |
                                     v
                                'clobbered'

Now, let's look at your example.

> def func(bar):
>     bar.pop()
>
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo

I won't describe this in the same excruciating detail as I did for the
one above; but I will make some observations.

In call-by-reference, the environment in which the body of `func' is
executed is constructed by extending the global environment with a
binding of the name `bar' to the same variable as is bound to `foo' in
the global environment.  There is only the one variable, so obviously
both names (considered as expressions) must evaluate to the same value.
I won't go into the details of method invocation, which in Python is
quite complicated; but `bar.pop()' mutates this value: it modifies it in
place.  So, when the function returns, `foo' can be seen to print
differently.  The value is, in some sense, the /same/ value as it was
before, in that it occupies the same storage locations, but the contents
of those storage locations has been altered.

              foo =====> [VAR] <===== bar
        (in global env)    |    (in function `func')   
                           |
                           v
                   ['Ethan', 'Furman']

In call-by-value, `func' executes in an environment constructed by
extending the global environment with a binding of `bar' to a /fresh/
variable.  This fresh variable is then initialized: we store the value
of the argument expression `foo' into it.  This value is a reference to
the list ['Ethan', 'Furman'].  (See, I've stopped parenthesizing the
reference stuff, because here it really matters.)  So, we have two
variables, bound to `foo' and `bar', but both variables refer to the
same list object.  The body of `func' doesn't modify any variables;
rather, it mutates the list object in place (as above).  Since both
variables refer to the /same/ list object, this mutation is still
observable outside of the function.

              foo =====> [VAR] ---> ['Ethan', 'Furman']
        (in global env)                     ^
                                            |
              bar =====> [VAR'] ------------'
        (in function `func')

So the reason that your example doesn't distinguish the two cases is
because, in both cases, there's still only one value, which is mutated.
But there is a conceptual difference, unobservable in this instance,
because call-by-reference has two names bound to the same variable,
while call-by-value has two names, bound to /distinct/ variables but
which both refer to the same value.

Finally, it may be instructive to remove the issue of function calling
altogether.  Consider:

        foo = ['Ethan', 'Furman']
        bar = foo
        bar.pop()

What is the final value of `foo'?

Now:

        x = 'virgin'
        y = x
        y = 'clobbered'

What is the final value of `x'?

Are you enlightened?

-- [mdw]


From mmcclaf at gmail.com  Sat Feb 28 10:00:22 2009
From: mmcclaf at gmail.com (mmcclaf)
Date: Sat, 28 Feb 2009 07:00:22 -0800 (PST)
Subject: Queries
References: <e2cc70d4-a8c8-4658-9aa3-aa4d132d1def@c11g2000yqj.googlegroups.com>
	<wu6dna3-zf5d6DrUnZ2dnUVZ_r6WnZ2d@earthlink.com>
	<mailman.894.1235739864.11746.python-list@python.org> 
	<efc719ec-aaf5-439c-ba0e-cf194aaab86e@l37g2000vba.googlegroups.com> 
	<goacjs$8cd$1@ger.gmane.org>
	<mailman.928.1235794240.11746.python-list@python.org>
Message-ID: <8289ef1a-d128-4eef-95db-dd515c8fff92@n20g2000vba.googlegroups.com>

So basically you are complaining that groups don't pick up post by
GMail users?

As for the SQL thing, you still don't see how I am linking this to
SQL? I have to make in your terms: a textual representation of the
statements I'd make in SQL. The statement I made with the bold SELECT,
etc, replace those with the relational algebra symbols, hence needing
to make a relational algebra expression.

>> So in short of the responses given, I need to study further: GROUP BY,
>> HAVING, AS, COUNT, and subselect queries, right?

>        Since it's homework, we (this group) won't be giving direct SQL statements...

I never said I wanted direct SQL statements, moreso guidance as to
what direction I should be heading for each of the queries. I just
wanted to make sure that there might not be other things I might want
to study as  well that might be required for the queries. Try not to
interpret what isn't there... I'm looking for help, not direct answers.


From cjw at ncf.ca  Sat Feb 28 10:58:10 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sat, 28 Feb 2009 10:58:10 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<871vtk7ub8.fsf@mulj.homelinux.net>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<7xd4d4hjaq.fsf@ruckus.brouhaha.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<7x63iwg2wg.fsf@ruckus.brouhaha.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
Message-ID: <49A95F12.3010906@ncf.ca>

Raymond Hettinger wrote:
> [Paul Rubin]
>> Ehh, I guess I'm not surprised at the slowdown and extra complexity
>> from the second dict.  Oh well.  If the module really turns out to be
>> really used a lot, another (messy) approach would be to write a C
>> extension that uses a doubly linked list some day.
> 
> That seems like an ideal implementation to me.
> 
>   O(1): appending, popping, searching, and deletion
>   O(n): traversal
> 
> Raymond

Sometimes, it's useful to be able to 
obtain the data in the sorted sequence.

You might consider adding functionality 
like:

     def seqItems(self):
         '''To return the items, sorted 
by key. '''
         return [self[k] for k in 
self.seqKeys()]

     def seqKeys(self):
         ''' To return the keys sorted.  '''
         k= self.keys()
         k.sort()
         return k

     def seqValues(self):
         ''' To return the values, with 
their keys, sorted by value. '''
         v= [(it[1], it[0]) for it in 
self.items()]
         v.sort()
         return v

Colin W.


From steve at pearwood.info  Sat Feb 28 10:59:18 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Mar 2009 02:59:18 +1100
Subject: Delete all items in the list
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>
	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>
	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>
	<go8opf$pd$4@ger.gmane.org>
	<mailman.900.1235742411.11746.python-list@python.org>
Message-ID: <01b9549a$0$20612$c3e8da3@news.astraweb.com>

Chris Rebert wrote:

> Obviously that equivalence is true, but in this case I'm emphasizing
> that it's even worse than that when constant factors are taken into
> account. Big-O is nice in the abstract, but in the real-world those
> constant factors can matter.
> 
> In pure big-O, it is indeed O(M*N) vs. O(N)
> Including constant factors, the performance is roughly 2*M*N*X [X =
> overhead of remove()] vs. N, which makes the badness of the algorithm
> all the more apparent.


So, what you're saying is that if you include a constant factor on one side
of the comparison, and neglect the constant factors on the other, the side
with the constant factor is worse. Well, duh :)

I forget which specific O(N) algorithm you're referring to, but I think it
was probably a list comp:

L[:] = [x for x in L if x != 'a']

As a wise man once said *wink*, "Big-O is nice in the abstract, but in the
real-world those constant factors can matter". This is very true... in this
case, the list comp requires creating a new list, potentially resizing it
an arbitrary number of times, then possibly garbage collecting the previous
contents of L. These operations are not free, and for truly huge lists
requiring paging, it could get very expensive.

Big Oh notation is good for estimating asymptotic behaviour, which means it
is good for predicting how an algorithm will scale as the size of the input
increases. It is useless for predicting how fast that algorithm will run,
since the actual speed depends on those constant factors that Big Oh
neglects. That's not a criticism of Big Oh -- predicting execution speed is
not what it is for.

For what it's worth, for very small lists, the while...remove algorithm is
actually faster that using a list comprehension, despite being O(M*N)
versus O(N), at least according to my tests. It's *trivially* faster, but
if you're interested in (premature) micro-optimisation, you might save one
or two microseconds by using a while loop for short lists (say, around
N<=12 or so according to my tests), and swapping to a list comp only for
larger input.

Now, this sounds silly, and in fact it is silly for the specific problem
we're discussing, but as a general technique it is very powerful. For
instance, until Python 2.3, list.sort() used a low-overhead but O(N**2)
insertion sort for small lists, only kicking off a high-overhead but O(N)
sample sort above a certain size. The current timsort does something
similar, only faster and more complicated. If I understand correctly, it
uses insertion sort to make up short runs of increasing or decreasing
values, and then efficiently merges them.


-- 
Steven



From steven.oldner at gmail.com  Sat Feb 28 11:08:17 2009
From: steven.oldner at gmail.com (steven.oldner)
Date: Sat, 28 Feb 2009 08:08:17 -0800 (PST)
Subject: Data Coding suggestions
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
	<477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>
Message-ID: <74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>

On Feb 27, 2:04?pm, Rick Dooling <rpdool... at gmail.com> wrote:
> On Feb 27, 6:42?am, "steven.oldner" <steven.old... at gmail.com> wrote:
>
> > Just learning Python and have a project to create a weekly menu and a
> > shopping list from the menu. ?
> > Question: ?How should I set up the data? ?I'm looking at maybe 70 menu
> > items and maybe 1000 items for the shopping list. ?I need to be able
> > to maintain each item also.
>
> I agree with Mr. Holden. It's a perfect exercise for using Python with
> sqlite3.
>
> And the nice thing about this documentation is it has plenty of good
> examples:
>
> http://docs.python.org/library/sqlite3.html
>
> Good luck,
>
> RD

Thanks guys.  While shopping today I've thought of a few more columns
for my data so my first item will be building the 3 DB tables and a
way to populate them.  Since this was intended to automate what I do
on a weekly basis, I didn't think about adding recipes since I know
what I need for the family, but that's a good touch.

Item 1. Build 3 db tables
Item 2. Build app to populate tables.
Item 3. Build app to read tables and print lists.

Anything else?



From steve at pearwood.info  Sat Feb 28 11:27:53 2009
From: steve at pearwood.info (Steven D'Aprano)
Date: Sun, 01 Mar 2009 03:27:53 +1100
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
Message-ID: <01b95b4d$0$20667$c3e8da3@news.astraweb.com>

Colin J. Williams wrote:

> Sometimes, it's useful to be able to
> obtain the data in the sorted sequence.
> 
> You might consider adding functionality
> like:
> 
> def seqItems(self):
> '''To return the items, sorted
> by key. '''
> return [self[k] for k in
> self.seqKeys()]

Amazingly, the Python time-machine provides such functionality! Using just a
handful of pre-existing pieces, you can do this:

sorted(mydict.items())
sorted(mydict.keys())
[mydict[x] for x in sorted(mydict.keys)]

and any other sequence you might need. That's the beauty of a general
purpose programming language. You don't need everything to be a built-in
*wink*



-- 
Steven



From zaheer.agadi at gmail.com  Sat Feb 28 11:34:15 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 08:34:15 -0800 (PST)
Subject: Creating Zip file like java jar file
Message-ID: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>

Hi,
I want to create zip file equivalent to java jar file,I created a zip
file of my sources and added some __main__.py
some how I am getting an error saying __main.py does not exist in the
zip file

  Copyproject(main folder)
      |
      |_____src(folder)
      |          |
      |          |__Nertworkpackage
      |           |            |
      |           |            |__Storepackage
      |           |                               |
      |           |__FtpPackage         |__module1.py
      |                                           |__module2.py
      |____ tests                          |__ module3.py

Copyproject(main folder) | |_____src(folder) | | | |__Nertworkpackage
| | | | | |__Storepackage | | | | |__FtpPackage |__module1.py | |
__module2.py |____ tests |__ module3.py

Module1 takes some commandline parameters that will do some operation
Like If I say
" module1.py --uploadFile <file name> " A file should get uploaded
(this works)
Now I want to do
Copyproject.zip --uploadFile <filename> to upload the file

How should I do this, I tried to put __main__ parallel to src folder
it says __Main__.py not found in Copyproject.zip..?



From daddysean23 at yahoo.com  Sat Feb 28 12:24:00 2009
From: daddysean23 at yahoo.com (Sean Novick)
Date: Sat, 28 Feb 2009 09:24:00 -0800 (PST)
Subject: TypeErrors
Message-ID: <260144.62922.qm@web33003.mail.mud.yahoo.com>

I'm having issues with?a phone-number database. 
Here is a code snippet:
?def menu():
??????? 
??????? print '''Please make a selection from the following options:
??????? To add an Employee - enter: 1
??????? 
??????? For a complete listing of Employees - enter: 2
??????? To see the 'test page' and exit the database - enter: 3'''
??????? print
??????? return input(":")
#Start of Program
??? foo = phonedb()
??? loop = 1
??? choice = 0
??? while loop == 1:
??????? choice = menu()
??????? if choice == 1:
??????????? print "Enter the Employee's full name: "
??????????? n = raw_input(':')
??????????? print "Enter the Employee's full telephone number: "
??????????? p = raw_input(':')
??????????? print "Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX, 4 = CELL)"
??????????? t = raw_input(':')
??????????? if t == '0':
??????????????? foo.add(n, p, UNKNOWN)
??????????? if t == '1':
??????????????? foo.add(n, p, HOME)
??????????? if t == '2':
??????????????? foo.add(n, p, WORK)
??????????? if t == '3':
??????????????? foo.add(n, p, FAX)
??????????? if t == '4':
??????????????? foo.add(n, p, CELL)
??????????????? print t
??? 
??????? elif choice == 2:
??????????? print(list)
??????????? 
??????? loop = 0
It works until I enter "t", then this is what I get:
"Please make a selection from the following options:
??????? To add an Employee - enter: 1
??????? 
??????? For a complete listing of Employees - enter: 2
??????? To see the 'test page' and exit the database - enter: 3"
:1
Enter the Employee's full name: 
:john
Enter the Employee's full telephone number: 
:123-456-7890
Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX, 4 = CELL)
:1
First lookup:
Traceback (most recent call last):
? File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
??? class phonedb:
? File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
??? for entry in foo.lookup('reifsch'):
? File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
??? if cmp(e, string) == 0:
TypeError: comparison did not return an int
>>> 
I do not know what this error means. I tried to look it up in help, but to no avail. If someone could please help or tell me where I could find an answer. Thanks.


      
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From hongyuan1306 at gmail.com  Sat Feb 28 12:35:47 2009
From: hongyuan1306 at gmail.com (Yuan HOng)
Date: Sun, 1 Mar 2009 01:35:47 +0800
Subject: How best to test functions which use date.today
Message-ID: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>

HI,

In my project I have several date related methods which I want tested for
correctness. The functions use date.today() in several places. Since this
could change every time I run the test, I hope to find someway to fake a
date.today.

For illustration lets say I have a function:


from datetime import date
def today_is_2009():
    return date.today().year == 2009

To test this I would like to write test function like:

def test_today_is_2009():
    set_today(date(2008, 12, 31))
    assert today_is_2009() == False
    set_today(date(2009,1,1))
    assert today_is_2009() == True

The first approach of achieving this purpose is to monkey patch the
date.today like:

date.today = mytoday

But this fails with:

TypeError: can't set attributes of built-in/extension type 'datetime.date'

A second possibility would be to change the system date (I am running
Linux). However the standard Python module doesn't provide a method for this
purpose. I could use os.system to issue a date command. But I am not very
comfortable with this since changing the system time could break something
undesirably. Also I will then have to have root privilege to run my test.
Besides, I will have to stop the ntp daemon so it will not inadvertently
correct the system clock during the test period.

Is there any suggestion from the community on how best to test such
functions?

-- 
Hong Yuan

?????????
???????????
http://www.homemaster.cn
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From rasmussen.bryan at gmail.com  Sat Feb 28 12:38:45 2009
From: rasmussen.bryan at gmail.com (bryan rasmussen)
Date: Sat, 28 Feb 2009 18:38:45 +0100
Subject: c.Win32_OperatingSystem question.
Message-ID: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>

Maybe there's a more specific list I should ask this question on but I
don't know what it is. I'm using Tim Golden's wmi stuff, and putting
my output into an XML document.

I have the following bit of code


  root = et.Element("locations")
        ComputerInfo = et.SubElement(root, "ComputerInfo")
        ComputerName = et.SubElement(ComputerInfo,"ComputerName")
        ComputerDomain = et.SubElement(ComputerInfo,"Domain")

        location = et.SubElement(root, "location")
        locationpath = et.SubElement(location, "locationpath")
        locationtype = et.SubElement(location, "locationtype")
        currenttime = et.SubElement(location,"time")

        currenttimeZone = et.SubElement(ComputerInfo,"timeZone")
        BootDevice = et.SubElement(ComputerInfo,"BootDevice")
        BuildNumber = et.SubElement(ComputerInfo,"BuildNumber")
        BuildType = et.SubElement(ComputerInfo,"BuildType")
        Caption = et.SubElement(ComputerInfo,"Caption")
        CodeSet = et.SubElement(ComputerInfo,"CodeSet")
        CountryCode = et.SubElement(ComputerInfo,"CountryCode")
        Description = et.SubElement(ComputerInfo,"ComputerDescription")
        FreePhysicalMemory = et.SubElement(ComputerInfo,"FreeMemory")
        LocalDateTime = et.SubElement(ComputerInfo,"LocalDateTime")
        Locale = et.SubElement(ComputerInfo,"Locale")
        Manufacturer = et.SubElement(ComputerInfo,"Manufacturer")
        Organization = et.SubElement(ComputerInfo,"ComputerOrganization")


        OSType = et.SubElement(ComputerInfo,"OperatingSystem")
        WindowsDirectory = et.SubElement(ComputerInfo,"WindowsDirectory")

        # print  "ok"
        # time.sleep(3)


        for oper in c.Win32_OperatingSystem():
          # print "here"
          # time.sleep(3)
          ComputerName.text = str(oper.Name)
          ComputerDomain.text = str(oper.Domain)
          currenttimeZone.text = str(oper.CurrentTimeZone)
          try:
            currenttime.text = str(datetime.datetime.utcnow())
            BootDevice.text = str(oper.BootDevice)
            BuildNumber = et.SubElement(oper.BuildNumber)
            BuildType.text = str(oper.BuildType)
            Caption.text = str(oper.Caption)
            CodeSet.text = str(oper.CodeSet)
            CountryCode.text = str(oper.CountryCode)
            Description.text = str(oper.ComputerDescription)
            FreePhysicalMemory.text = str(oper.FreeMemory)
            LocalDateTime.text = str(oper.LocalDateTime)
            Locale.text = str(oper.Locale)
            Manufacturer.text = str(oper.Manufacturer)
            Organization.text = str(oper.ComputerOrganization)


            OSType.text = str(oper.OperatingSystem)
            WindowsDirectory.text = str(oper.WindowsDirectory)


At the end of that thhe only text node thaht comes out is
ComputerName, WMI is running - Am I using the wrong names for things
here? When I try to get the same values using WScript and WQL to
extract from Win32_OperatingSystem I get all the values.

Best Regards,
Bryan Rasmussen


From tjreedy at udel.edu  Sat Feb 28 12:46:13 2009
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 28 Feb 2009 12:46:13 -0500
Subject: Delete all items in the list
In-Reply-To: <01b9549a$0$20612$c3e8da3@news.astraweb.com>
References: <f87d719c-cc00-4daf-ba44-fe0b67372db9@q27g2000vbn.googlegroups.com>	<35df0b67-3403-444b-93ba-c516bf67d110@p2g2000prf.googlegroups.com>	<50697b2c0902262259t4820cdffj643531e2bbe8cb0d@mail.gmail.com>	<go8opf$pd$4@ger.gmane.org>	<mailman.900.1235742411.11746.python-list@python.org>
	<01b9549a$0$20612$c3e8da3@news.astraweb.com>
Message-ID: <gobt95$nk8$1@ger.gmane.org>

Steven D'Aprano wrote:

> Big Oh notation is good for estimating asymptotic behaviour, which means it
> is good for predicting how an algorithm will scale as the size of the input
> increases. It is useless for predicting how fast that algorithm will run,
> since the actual speed depends on those constant factors that Big Oh
> neglects. That's not a criticism of Big Oh -- predicting execution speed is
> not what it is for.
> 
> For what it's worth, for very small lists, the while...remove algorithm is
> actually faster that using a list comprehension, despite being O(M*N)
> versus O(N), at least according to my tests. It's *trivially* faster, but
> if you're interested in (premature) micro-optimisation, you might save one
> or two microseconds by using a while loop for short lists (say, around
> N<=12 or so according to my tests), and swapping to a list comp only for
> larger input.
> 
> Now, this sounds silly, and in fact it is silly for the specific problem
> we're discussing, but as a general technique it is very powerful. For
> instance, until Python 2.3, list.sort() used a low-overhead but O(N**2)
> insertion sort for small lists, only kicking off a high-overhead but O(N)

O(NlogN)

> sample sort above a certain size. The current timsort does something
> similar, only faster and more complicated. If I understand correctly, it
> uses insertion sort to make up short runs of increasing or decreasing
> values, and then efficiently merges them.

It uses binary insertion sort to make runs of 64 (determined by 
empirical testing).  The 'binary' part means that it uses O(logN) binary 
search rather than O(n) linear search to find the insertion point for 
each of N items, so that finding insertion points uses only O(NlogN) 
comparisions (which are relatively expensive).  Each of the N insertions 
is done with a single memmove() call, which typically is relatively 
fast.  So although binary insertion sort is still O(N*N), the 
coefficient of the N*N term in the time formula is relatively small.

The other advantages of timsort are that it exploits existing order in a 
list while preserving the order of items that compare equal.

Terry Jan Reedy




From rasmussen.bryan at gmail.com  Sat Feb 28 12:47:33 2009
From: rasmussen.bryan at gmail.com (bryan rasmussen)
Date: Sat, 28 Feb 2009 18:47:33 +0100
Subject: c.Win32_OperatingSystem question.
In-Reply-To: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
References: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
Message-ID: <3bb44c6e0902280947q2446c572u873dc906b5ffb7bd@mail.gmail.com>

oh I noticed the problem with the
BuildNumber = et.SubElement(oper.BuildNumber)
instead of
BuildNumber = str(oper.BuildNumber)

and fixed it. No improvement in results however.

Best Regards,
Bryan Rasmussen

On Sat, Feb 28, 2009 at 6:38 PM, bryan rasmussen
<rasmussen.bryan at gmail.com> wrote:
> Maybe there's a more specific list I should ask this question on but I
> don't know what it is. I'm using Tim Golden's wmi stuff, and putting
> my output into an XML document.
>
> I have the following bit of code
>
>
> ?root = et.Element("locations")
> ? ? ? ?ComputerInfo = et.SubElement(root, "ComputerInfo")
> ? ? ? ?ComputerName = et.SubElement(ComputerInfo,"ComputerName")
> ? ? ? ?ComputerDomain = et.SubElement(ComputerInfo,"Domain")
>
> ? ? ? ?location = et.SubElement(root, "location")
> ? ? ? ?locationpath = et.SubElement(location, "locationpath")
> ? ? ? ?locationtype = et.SubElement(location, "locationtype")
> ? ? ? ?currenttime = et.SubElement(location,"time")
>
> ? ? ? ?currenttimeZone = et.SubElement(ComputerInfo,"timeZone")
> ? ? ? ?BootDevice = et.SubElement(ComputerInfo,"BootDevice")
> ? ? ? ?BuildNumber = et.SubElement(ComputerInfo,"BuildNumber")
> ? ? ? ?BuildType = et.SubElement(ComputerInfo,"BuildType")
> ? ? ? ?Caption = et.SubElement(ComputerInfo,"Caption")
> ? ? ? ?CodeSet = et.SubElement(ComputerInfo,"CodeSet")
> ? ? ? ?CountryCode = et.SubElement(ComputerInfo,"CountryCode")
> ? ? ? ?Description = et.SubElement(ComputerInfo,"ComputerDescription")
> ? ? ? ?FreePhysicalMemory = et.SubElement(ComputerInfo,"FreeMemory")
> ? ? ? ?LocalDateTime = et.SubElement(ComputerInfo,"LocalDateTime")
> ? ? ? ?Locale = et.SubElement(ComputerInfo,"Locale")
> ? ? ? ?Manufacturer = et.SubElement(ComputerInfo,"Manufacturer")
> ? ? ? ?Organization = et.SubElement(ComputerInfo,"ComputerOrganization")
>
>
> ? ? ? ?OSType = et.SubElement(ComputerInfo,"OperatingSystem")
> ? ? ? ?WindowsDirectory = et.SubElement(ComputerInfo,"WindowsDirectory")
>
> ? ? ? ?# print ?"ok"
> ? ? ? ?# time.sleep(3)
>
>
> ? ? ? ?for oper in c.Win32_OperatingSystem():
> ? ? ? ? ?# print "here"
> ? ? ? ? ?# time.sleep(3)
> ? ? ? ? ?ComputerName.text = str(oper.Name)
> ? ? ? ? ?ComputerDomain.text = str(oper.Domain)
> ? ? ? ? ?currenttimeZone.text = str(oper.CurrentTimeZone)
> ? ? ? ? ?try:
> ? ? ? ? ? ?currenttime.text = str(datetime.datetime.utcnow())
> ? ? ? ? ? ?BootDevice.text = str(oper.BootDevice)
> ? ? ? ? ? ?BuildNumber = et.SubElement(oper.BuildNumber)
> ? ? ? ? ? ?BuildType.text = str(oper.BuildType)
> ? ? ? ? ? ?Caption.text = str(oper.Caption)
> ? ? ? ? ? ?CodeSet.text = str(oper.CodeSet)
> ? ? ? ? ? ?CountryCode.text = str(oper.CountryCode)
> ? ? ? ? ? ?Description.text = str(oper.ComputerDescription)
> ? ? ? ? ? ?FreePhysicalMemory.text = str(oper.FreeMemory)
> ? ? ? ? ? ?LocalDateTime.text = str(oper.LocalDateTime)
> ? ? ? ? ? ?Locale.text = str(oper.Locale)
> ? ? ? ? ? ?Manufacturer.text = str(oper.Manufacturer)
> ? ? ? ? ? ?Organization.text = str(oper.ComputerOrganization)
>
>
> ? ? ? ? ? ?OSType.text = str(oper.OperatingSystem)
> ? ? ? ? ? ?WindowsDirectory.text = str(oper.WindowsDirectory)
>
>
> At the end of that thhe only text node thaht comes out is
> ComputerName, WMI is running - Am I using the wrong names for things
> here? When I try to get the same values using WScript and WQL to
> extract from Win32_OperatingSystem I get all the values.
>
> Best Regards,
> Bryan Rasmussen
>


From lie.1296 at gmail.com  Sat Feb 28 12:54:05 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 04:54:05 +1100
Subject: How best to test functions which use date.today
In-Reply-To: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
Message-ID: <49A97A3D.6@gmail.com>

Yuan HOng wrote:
> HI,
> 
> In my project I have several date related methods which I want tested for
> correctness. The functions use date.today() in several places. Since this
> could change every time I run the test, I hope to find someway to fake a
> date.today.
> 
> For illustration lets say I have a function:
> 
> 
> from datetime import date
> def today_is_2009():
>     return date.today().year == 2009
> 
> To test this I would like to write test function like:
> 
> def test_today_is_2009():
>     set_today(date(2008, 12, 31))
>     assert today_is_2009() == False
>     set_today(date(2009,1,1))
>     assert today_is_2009() == True
> 
> The first approach of achieving this purpose is to monkey patch the
> date.today like:
> 
> date.today = mytoday
> 
> But this fails with:
> 
> TypeError: can't set attributes of built-in/extension type 'datetime.date'

This is because today is an attribute. In python, we can override 
attribute access to become a function call. I don't have python right 
now, but try this:

del date.today
date.today = mytoday

> A second possibility would be to change the system date (I am running
> Linux). However the standard Python module doesn't provide a method for this
> purpose. I could use os.system to issue a date command. But I am not very
> comfortable with this since changing the system time could break something
> undesirably. Also I will then have to have root privilege to run my test.
> Besides, I will have to stop the ntp daemon so it will not inadvertently
> correct the system clock during the test period.
> 
> Is there any suggestion from the community on how best to test such
> functions?

It is a very bad idea to change the system date.



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 13:15:27 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 16:15:27 -0200
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
Message-ID: <op.up2qb1e7x6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.agadi at gmail.com> escribi?:

> I want to create zip file equivalent to java jar file,I created a zip
> file of my sources and added some __main__.py
> it says __Main__.py not found in Copyproject.zip..?

__main__.py must exist in the root directory.

-- 
Gabriel Genellina



From zaheer.agadi at gmail.com  Sat Feb 28 13:27:45 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 10:27:45 -0800 (PST)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
Message-ID: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>

On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> > I want to create zip file equivalent to java jar file,I created a zip
> > file of my sources and added some __main__.py
> > it says __Main__.py not found in Copyproject.zip..?
>
> __main__.py must exist in the root directory.
>
> --
> Gabriel Genellina

What do you mean by root directory..?What is this directory in
Windows..?You mean the top level folder of the project?in my case
copyproject folder..?


From lie.1296 at gmail.com  Sat Feb 28 13:33:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 05:33:38 +1100
Subject: Creating Zip file like java jar file
In-Reply-To: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
Message-ID: <49A98382.8000007@gmail.com>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>>
>>> I want to create zip file equivalent to java jar file,I created a zip
>>> file of my sources and added some __main__.py
>>> it says __Main__.py not found in Copyproject.zip..?
>> __main__.py must exist in the root directory.
>>
>> --
>> Gabriel Genellina
> 
> What do you mean by root directory..?What is this directory in
> Windows..?You mean the top level folder of the project?in my case
> copyproject folder..?

root directory is the topmost directory (imagine a tree, the root is
where all the branches branched from), in this case the root directory
is your copyproject main folder.



From lie.1296 at gmail.com  Sat Feb 28 13:33:38 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 05:33:38 +1100
Subject: Creating Zip file like java jar file
In-Reply-To: <a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
Message-ID: <49A98382.8000007@gmail.com>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>>
>>> I want to create zip file equivalent to java jar file,I created a zip
>>> file of my sources and added some __main__.py
>>> it says __Main__.py not found in Copyproject.zip..?
>> __main__.py must exist in the root directory.
>>
>> --
>> Gabriel Genellina
> 
> What do you mean by root directory..?What is this directory in
> Windows..?You mean the top level folder of the project?in my case
> copyproject folder..?

root directory is the topmost directory (imagine a tree, the root is
where all the branches branched from), in this case the root directory
is your copyproject main folder.


From lists at cheimes.de  Sat Feb 28 13:39:35 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 28 Feb 2009 19:39:35 +0100
Subject: How best to test functions which use date.today
In-Reply-To: <49A97A3D.6@gmail.com>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<49A97A3D.6@gmail.com>
Message-ID: <goc0d7$vg3$1@ger.gmane.org>

Lie Ryan wrote:
>> But this fails with:
>>
>> TypeError: can't set attributes of built-in/extension type
>> 'datetime.date'
> 
> This is because today is an attribute. In python, we can override
> attribute access to become a function call. I don't have python right
> now, but try this:
> 
> del date.today
> date.today = mytoday

It won't work. The datetime module is written in C. You can't modify a C
 extension.

Christian



From pafboing at gmail.com  Sat Feb 28 13:40:23 2009
From: pafboing at gmail.com (Christian R.)
Date: Sat, 28 Feb 2009 13:40:23 -0500
Subject: OTish: convince the team to drop VBScript
Message-ID: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>

Hello,

Brand new to this list, I've not found a quick way to search the
archives, and this is not a technical question.

I've just been hired at a digital signage company. They use VBScript
for simple-to-medium scripting. I've abandoned it about 8 years ago. I
want to convince the manager and the two programmers to switch to
Python. My main arguments for Python:
	- Faster
	- More powerful
	- Simpler syntax
	- More up-to-date, evolving
	- Modularity
	- Lots of open source modules
	- Better for development of "tools" (a goal stated by the mgr)

Not so sure:
	- Easier to integrate/translate with/into C#, which is what is used
there for complex development. Am I right?

The company does use Python on rare occasions. It all comes down to
the prejudices and habits of one of the programmers. His only argument
I can't counter -because I don't see the problem- is that "Python
modules cause problems for updates to customer's installations".

My major points will be:
	- Easier for all three of us
	- Stay up-to-date with industry. VBScript soon obsolescent.
	- Better for the company (state-of-the-art skills, think about the
future, assets re-use etc.)

Any details or added arguments are welcome. In advance, thanks!


From zaheer.agadi at gmail.com  Sat Feb 28 13:51:04 2009
From: zaheer.agadi at gmail.com (zaheer.agadi at gmail.com)
Date: Sat, 28 Feb 2009 10:51:04 -0800 (PST)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
Message-ID: <c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>

On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
> zaheer.ag... at gmail.com wrote:
> > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > wrote:
> >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi?:
>
> >>> I want to create zip file equivalent to java jar file,I created a zip
> >>> file of my sources and added some __main__.py
> >>> it says __Main__.py not found in Copyproject.zip..?
> >> __main__.py must exist in the root directory.
>
> >> --
> >> Gabriel Genellina
>
> > What do you mean by root directory..?What is this directory in
> > Windows..?You mean the top level folder of the project?in my case
> > copyproject folder..?
>
> root directory is the topmost directory (imagine a tree, the root is
> where all the branches branched from), in this case the root directory
> is your copyproject main folder.



I wonder, I do have the __main__.py  in the root directory,but still
getting
python.exe cannot find __main__.py in CopyProject.zip

I used the following command
python Copyproject.zip -m __main__.py --uploadFile and also tried with
python Copyproject.zip --uploadFile
both give me the same error , I can see the sys.path contains the
project folder.


From rayvd at bludgeon.org  Sat Feb 28 13:56:11 2009
From: rayvd at bludgeon.org (Ray Van Dolson)
Date: Sat, 28 Feb 2009 10:56:11 -0800
Subject: Python alternatives to Text::SimpleTable?
Message-ID: <20090228185611.GA29288@bludgeon.org>

So I'm looking for an easy (read: lazy) way to generate output in nice
ASCII tables like the Text::SimpleTable[1] module in perl.  I've come
across two so far in the Python world that look promising[2][3] but I'm
wondering if anyone else out there has some recommendations for me.

Thanks,
Ray

[1] http://search.cpan.org/dist/Text-SimpleTable/lib/Text/SimpleTable.pm
[2] http://pypi.python.org/pypi/text_table/0.02
[3] http://jefke.free.fr/stuff/python/texttable/


From nytrokiss at gmail.com  Sat Feb 28 13:58:26 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sat, 28 Feb 2009 20:58:26 +0200
Subject: ANN: updates to Python-by-example
In-Reply-To: <49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>
References: <379a7319-376d-4486-954a-fc7035b0deb9@j38g2000yqa.googlegroups.com>
	<mailman.903.1235745632.11746.python-list@python.org>
	<49ff5759-61da-4de2-a226-5f34cd6b324d@x13g2000yqf.googlegroups.com>
Message-ID: <8a6b8e350902281058k6228a721s9c90e1fba123eed3@mail.gmail.com>

Thanks for adding this. I needed to show someone some examples...

On Fri, Feb 27, 2009 at 5:35 PM, steven.oldner <steven.oldner at gmail.com>wrote:

> On Feb 27, 8:40 am, pyt... at bdurham.com wrote:
> > Rainy,
> >
> > Great stuff! Thanks for your examples with the community!!
> >
> > Regards,
> > Malcolm
>
> Let me add my thanks!  I using it now...
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.astorandblack.com
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From lists at cheimes.de  Sat Feb 28 13:59:50 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 28 Feb 2009 19:59:50 +0100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A989A6.5080605@cheimes.de>

Christian R. schrieb:
> Hello,
> 
> Brand new to this list, I've not found a quick way to search the
> archives, and this is not a technical question.
> 
> I've just been hired at a digital signage company. They use VBScript
> for simple-to-medium scripting. I've abandoned it about 8 years ago. I
> want to convince the manager and the two programmers to switch to
> Python. My main arguments for Python:
> 	- Faster
> 	- More powerful
> 	- Simpler syntax
> 	- More up-to-date, evolving
> 	- Modularity
> 	- Lots of open source modules
> 	- Better for development of "tools" (a goal stated by the mgr)

- Heavily used by lots of large companies and major players like Google,
NASA, CERN ... Check out http://www.python.org/about/success/

> Not so sure:
> 	- Easier to integrate/translate with/into C#, which is what is used
> there for complex development. Am I right?

Well, there are IronPython and PythonDotNET. The former ist a full blown
implementation of Python in .NET sponsored by Microsoft and part of the
next release of Visual Studio. The later is a bridge between .NET and
CPython.

Christian



From nytrokiss at gmail.com  Sat Feb 28 14:01:27 2009
From: nytrokiss at gmail.com (James Matthews)
Date: Sat, 28 Feb 2009 21:01:27 +0200
Subject: What's so wrong about execfile?
In-Reply-To: <c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>
References: <e0b4d188-c1f2-43dc-9b8c-d312002d2c72@d19g2000prh.googlegroups.com>
	<c32606c2-be24-4044-a9a4-c16247115a75@k29g2000prf.googlegroups.com>
Message-ID: <8a6b8e350902281101h2f1b17b9ud8268e0480b7b0d5@mail.gmail.com>

It is considered one of the big holes in PHP (Remote file include...)
However in Python things can be done securely

On Sat, Feb 28, 2009 at 7:15 AM, Carl Banks <pavlovevidence at gmail.com>wrote:

> On Feb 27, 7:21 pm, Sammo <sammo2... at gmail.com> wrote:
> > Given that execfile has been removed in py3k, I want to understand
> > exactly why.
> >
> > Okay, I get that execfile is bad from the following thread:
> >
> > On Jul 29 2007, 2:39 pm, Steven D'Aprano
> >
> >
> >
> > <st... at REMOVE.THIS.cybersource.com.au> wrote:
> > > (1) Don't use eval, exec or execfile.
> >
> > > (2) If you're an expert, don't use eval, exec or execfile.
> >
> > > (3) If you're an expert, and are fully aware of the security risks,
> don't
> > > use eval, exec or execfile.
> >
> > > (4) If you're an expert, and are fully aware of the security risks, and
> > > have a task that can only be solved by using eval, exec or execfile,
> find
> > > another solution.
> >
> > > (5) If there really is no other solution, you haven't looked hard
> enough.
> >
> > > (6) If you've looked REALLY hard, and can't find another solution, AND
> > > you're an expert and are fully aware of the security risks, THEN you
> can
> > > think about using eval, exec or execfile.
> >
> > What are some of the reasons why execfile should not be used?
> >
> > What are some examples of cases where execfile is the correct way of
> > doing something?
>
> You didn't quote the context of Steven's reply, so I don't know if he
> was talking in general, or for a particular situation.  I suspect it
> was the latter, though.
>
> Anyway, there is one generally valid use case for these three: when
> it's your deliberate intention to give the user the power to run
> arbitrary Python code.  If you really want to give the user this
> power, and the user is trusted on whatever machine they are running it
> on, go ahead and use it.  No apology necessary.
>
> [For instance, the package I use to generate my web site uses exec and
> eval, because it processes templates with embedded Python code.  It's
> all generated statically, on my own desktop, and I author all the
> pages myself, so there is no security risk.  If I were to distribute
> this package (and I do, though not many people use it, because
> everyone just writes their own HTML templates), there would be no risk
> because the user is expected to be able to run Python, and if they can
> be trusted to run Python on their own system, they can be trusted to
> run my program, which execs templates that they write themselves.]
>
> I would suggest, however, that even if that is your intention that you
> consider leveraging Python's built-in import infrastructure.  Instead
> of execfile, you could have your program simply import a module the
> user writes (after adding a user-specific directory to sys.path).
>
>
> Now, here are a few situations where you should follow Steven's advice
> above (i.e., don't, ever):
>
> - Don't ever use exec or eval to construct a variable name
> dynamically.  Don't ever do this, for instance:
>
> x = eval("self","%s%d" % (name,index))
>
> This is unforgiveable.  Python has better and safer ways to do this
> (use getattr, setattr, globals, and locals built-ins).  And if you
> find yourself using them a lot, it's a red flag that you should be
> using dicts instead.
>
> - Don't ever pass any data to exec or eval that you didn't either
> write, or thoroughly inspect, yourself.  Especially don't pass it any
> data you received over the network.  You have to be the super extreme
> expert that Steven described, and own a lot of liability insurance,
> befor you can do that.
>
>
> Carl Banks
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com/

http://www.jewelerslounge.com/
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From pataphor at gmail.com  Sat Feb 28 14:02:38 2009
From: pataphor at gmail.com (pataphor)
Date: Sat, 28 Feb 2009 20:02:38 +0100
Subject: KeyedList
Message-ID: <20090228200238.0b7dd7f1@hyperspace>

The ordered dictionary discussion made me think of another data type
which seems to be somewhat related, a kind of ordered dictionary where
the order of the items is arbitrary. One can insert items in the middle
and still have O(1) access (I think). I have provided a very basic
implementation, it could be extended to also remove items with O(1)
access. I am wondering if the idea makes sense at all and what would be
the best name for the type itself and for its methods. 

Could it be that the ordered dictionary is a result of a way of
thinking which slowly extends what we currently have, while a
KeyedList or whatever we ultimately choose to name it is the kind of
data type we are really looking for? If accepted, I think this type
could be used for Knuth's dancing links style algorithms.

P.

#warning, embryonic, probably very buggy implementation

class Node:
    
    def __init__(self, left = None, right = None, key = None, item =
None): self.left = left
        self.right = right
        self.key = key
        self.item = item

class KeyedList:
    
    def __init__(self):
        self.first = Node()
        self.last = Node()
        self.last.left = self.first
        self.first.right = self.last
        self.D = {}
    
    def append(self, key, item):
        last = self.last
        prev = last.left
        x = Node(prev,last,key,item)
        prev.right = x
        last.left = x
        self.D[key] = x
    
    def insertafter(self,key1,key2,item):
        left = self.D[key1]
        right = left.right
        x = Node(left,right,key2,item)
        left.right =x
        right.left =x
        self.D[key2] = x
    
    def iteritems(self):
        x = self.first.right
        while x.right:
            key = x.key
            yield key, self.D[key].item
            x = x.right
        
def test():
    K = KeyedList()
    K.append('one','hello')
    K.append('two','hello')
    K.append('four','hello')
    K.insertafter('two','three','hello')
    for x in K.iteritems():
        print x
    
if __name__ == '__main__':
    test()


From kwmsmith at gmail.com  Sat Feb 28 14:08:07 2009
From: kwmsmith at gmail.com (Kurt Smith)
Date: Sat, 28 Feb 2009 13:08:07 -0600
Subject: Data Coding suggestions
In-Reply-To: <74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>
References: <f2e73c22-8b07-4cdb-8589-574324e03706@l16g2000yqo.googlegroups.com>
	<477a8bf4-1b3e-4708-affe-7aaef1ac1691@w34g2000yqm.googlegroups.com>
	<74507389-fc4d-4c14-ba72-193566090b22@x38g2000yqj.googlegroups.com>
Message-ID: <c266a7930902281108p57fa5d80j63ac98e4c3cd21f4@mail.gmail.com>

On Sat, Feb 28, 2009 at 10:08 AM, steven.oldner <steven.oldner at gmail.com> wrote:

>
> Thanks guys. ?While shopping today I've thought of a few more columns
> for my data so my first item will be building the 3 DB tables and a
> way to populate them. ?Since this was intended to automate what I do
> on a weekly basis, I didn't think about adding recipes since I know
> what I need for the family, but that's a good touch.
>
> Item 1. Build 3 db tables
> Item 2. Build app to populate tables.
> Item 3. Build app to read tables and print lists.
>
> Anything else?

You might take a look at the source code for the Gourmet Recipe Manager

http://grecipe-manager.sourceforge.net/

It's written in python, has a persistent database (not sure if using
sqlite3) and you might be able to adapt it to your needs.

We use it for our shopping lists here and it's great.

Kurt


From benjamin.kaplan at case.edu  Sat Feb 28 14:10:24 2009
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 28 Feb 2009 14:10:24 -0500
Subject: TypeErrors
In-Reply-To: <260144.62922.qm@web33003.mail.mud.yahoo.com>
References: <260144.62922.qm@web33003.mail.mud.yahoo.com>
Message-ID: <ec96e1390902281110n1c7df7uec96ae87a7a7add9@mail.gmail.com>

On Sat, Feb 28, 2009 at 12:24 PM, Sean Novick <daddysean23 at yahoo.com> wrote:

> I'm having issues with a phone-number database.
> Here is a code snippet:
>  def menu():
>
>         print '''Please make a selection from the following options:
>         To add an Employee - enter: 1
>
>         For a complete listing of Employees - enter: 2
>         To see the 'test page' and exit the database - enter: 3'''
>         print
>         return input(":")
> #Start of Program
>     foo = phonedb()
>     loop = 1
>     choice = 0
>     while loop == 1:
>         choice = menu()
>         if choice == 1:
>             print "Enter the Employee's full name: "
>             n = raw_input(':')
>             print "Enter the Employee's full telephone number: "
>             p = raw_input(':')
>             print "Enter the telephone number type:(0 = UNKNOWN, 1 = HOME,
> 2 = WORK, 3 = FAX, 4 = CELL)"
>             t = raw_input(':')
>             if t == '0':
>                 foo.add(n, p, UNKNOWN)
>             if t == '1':
>                 foo.add(n, p, HOME)
>             if t == '2':
>                 foo.add(n, p, WORK)
>             if t == '3':
>                 foo.add(n, p, FAX)
>             if t == '4':
>                 foo.add(n, p, CELL)
>                 print t
>
>         elif choice == 2:
>             print(list)
>
>         loop = 0
> It works until I enter "t", then this is what I get:
> "Please make a selection from the following options:
>         To add an Employee - enter: 1
>
>         For a complete listing of Employees - enter: 2
>         To see the 'test page' and exit the database - enter: 3"
> :1
> Enter the Employee's full name:
> :john
> Enter the Employee's full telephone number:
> :123-456-7890
> Enter the telephone number type:(0 = UNKNOWN, 1 = HOME, 2 = WORK, 3 = FAX,
> 4 = CELL)
> :1
> First lookup:
> Traceback (most recent call last):
>   File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
>     class phonedb:
>   File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
>     for entry in foo.lookup('reifsch'):
>   File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
>     if cmp(e, string) == 0:
> TypeError: comparison did not return an int
> >>>
> I do not know what this error means. I tried to look it up in help, but to
> no avail. If someone could please help or tell me where I could find an
> answer. Thanks.
>


Do you see the little part where it tells you? Your problem has nothing to
do with the stuff you showed us. It took place in
simple database.py, line 101. At the point "if cmp(e, string) == 0". First
of all, why are you doing cmp(e,string)==0? Use  "if e == string" instead.
It's the same thing (sometimes even calls the same code), but it's easier to
read. The problem was exactly what it said: the __cmp__ method in whatever
class e is needs to return an int. It isn't, so you get this problem Also,
in new code, it's considered better to use rich comparisons (__eq__, __ne__,
etc.) rather than __cmp__. That's another reason to use e == string. If e
uses __eq__, == will work. If e uses __cmp__, == will still work.
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From kmcbrearty at yahoo.com  Sat Feb 28 14:13:35 2009
From: kmcbrearty at yahoo.com (KMCB)
Date: Sat, 28 Feb 2009 11:13:35 -0800 (PST)
Subject: Static Map
Message-ID: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>

Hello,

I'm interested in creating a static map of a region in the US.  This
map would be set into a picture format, so I can add it to a
document.  I would like it to contain some town names and road
information.  Then I would like to add points, based on LAT and LONG,
that can be labeled with information I provide.

I have done some searching, Google Maps probably will not work because
of the License.  WuGeo does not seam to have the details.  I was
considering tw.openlayers, but do not know if that is the best
starting point.  If I could not create the picture from Python, would
use tw and then create a screen shot to get started.

Does anyone have thoughts on a better approach?

KMCB


From mail at timgolden.me.uk  Sat Feb 28 14:15:40 2009
From: mail at timgolden.me.uk (Tim Golden)
Date: Sat, 28 Feb 2009 19:15:40 +0000
Subject: c.Win32_OperatingSystem question.
In-Reply-To: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
References: <3bb44c6e0902280938m274bc60fq9c0b304a79cfcfb8@mail.gmail.com>
Message-ID: <49A98D5C.2090408@timgolden.me.uk>

bryan rasmussen wrote:
> Maybe there's a more specific list I should ask this question on but I
> don't know what it is. I'm using Tim Golden's wmi stuff, and putting
> my output into an XML document.
> 
> I have the following bit of code
> 
[.. snip ...]
> 
> At the end of that thhe only text node thaht comes out is
> ComputerName, WMI is running - Am I using the wrong names for things
> here? When I try to get the same values using WScript and WQL to
> extract from Win32_OperatingSystem I get all the values.


I'd love to help here, but you're not making it easy. I'm not
clear if you're suggesting there's a problem with WMI or with
ElementTree or with something else. Can you narrow down, please
so I don't have to invent a code wrapper for your code fragment.
Try producing an instantly-runnable piece of code which demonstrates
the problem and I'll happily have a look from the WMI perspective at
least.

TJG


From rdmurray at bitdance.com  Sat Feb 28 14:46:00 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 19:46:00 +0000 (UTC)
Subject: why cannot assign to function call
References: <mailman.6353.1230595599.3487.python-list@python.org>
	<01728080$0$8693$c3e8da3@news.astraweb.com>
	<slrngm6p54.qun.mdw@metalzone.distorted.org.uk>
	<531b4545-b26f-44b7-894f-43c0e8c56334@s9g2000prg.googlegroups.com>
	<pan.2009.01.07.02.25.21@REMOVE.THIS.cybersource.com.au>
	<slrngm89he.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.07.08.53.28@REMOVE.THIS.cybersource.com.au>
	<slrngm90aj.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.08.07.45.37@REMOVE.THIS.cybersource.com.au>
	<2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>
	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>
	<01771716$0$8693$c3e8da3@news.astraweb.com>
	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>
	<0178651d$0$8693$c3e8da3@news.astraweb.com>
	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>
	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
	<87myc6oee7.fsf.mdw@metalzone.distorted.org.uk>
Message-ID: <goc49o$b8n$1@ger.gmane.org>

Mark Wooding <mdw at distorted.org.uk> wrote:
> Ethan Furman <ethan at stoneleaf.us> writes:
> 
> > Mark Wooding wrote:
> >> Here's what I think is the defining property of pass-by-value [...]:
> >>
> >>   The callee's parameters are /new variables/, initialized /as if by
> >>   assignment/ from the values of caller's argument expressions.
> >>
> >> My soundbite definition for pass-by-reference is this:
> >>
> >>   The callee's parameters are merely /new names/ for the caller's
> >>   argument variables -- as far as that makes sense.
> >
> > Greetings, Mark!
> 
> You posted to the whole group -- probably using a wide-reply option
> while reading the mailing list.  Still, I'll give an answer here in
> order to help any other readers of the list or newsgroup.  However, as
> far as I'm concerned, this discussion is basically at an end and I'm not
> really interested in starting it up all over again.  To that end, I've
> set followups to `poster'.  I shall continue reply to private email
> which seems interested in a sensible discussion.

I just popped in to this thread, and read the whole thing in a marathon
session (why, I'm not quite sure, but somehow I found it interesting :).
I'm going to follow up here at the risk of annoying Mark, because I
think there may be a way to reconcile the language in a way that is
helpful in explaining things to Python beginners.

> > I was hoping you might be able to clarify those last two sound bites
> > for me -- I think I understand what you are saying, but I'm confused
> > about how they relate to Python...

I think this is the key point.  I am an experienced Python programmer,
and I had to think long and hard about what you were saying, Mark, in
order to understand how it applied to Python.  I think this means that
your model and/or your level of abstraction is not "natural" when trying
to understand Python programs, and I think I may have figured out why.

> > Specifically, how is a new name (pbr) different, in Python, from a new
> > name initialized as if by assignment (pbv)?  It seems to me than you
> > end up with the same thing in either case (in Python, at least),
> > making the distinction non-existent.
> 
> You've missed a level of indirection.  In particular, `names' aren't
> things that you initialize.  They're things that you /bind/ to
> variables.  The crucial difference is that, in pass-by-value, new
> variables are created as an intrinsic part of the process, whereas in
> pass-by-reference, new variables are not (usually) created, and instead
> the formal parameter names are bound to the caller's pre-existing
> argument variables.

I think that the reason Ethan missed that level of indirection is that
Python hides that level of indirection from the programmer.  And I think
that this is where the conversation between you and Steven got hung
up, Mark.  You are firmly grounded in how languages work in general,
so your conceptual model naturally includes details that Steven's
conceptual model can ignore, because he's dealing only with the model
used by Python.  He can (and wants to!) ignore the level of indirection
that Python doesn't even give him access to.

In short, there is a reason why you almost never hear the word 'variable'
from an experienced Python programmer when talking about the Python model.
That level detail is abstracted into something else by the Python
conceptual model: it becomes a namespace mapping names to objects.

> It's worth noting that I use the terms `name' and `binding' in different
> ways from most of the Python community.  This is unfortunate.  The
> discrepancy is actually because the Python meanings of these words are
> not the same as the meanings in the wider computer science and
> mathematical communities.  For example, many Python users seem to use
> `binding' to mean `assignment', which is a shame because it leaves the
> concept that is usually called `binding' without a name.  So I'll stick
> with the wider meanings.

It seems to me from reading the thread that everyone is actually in
pretty good agreement that 'name' is the symbol one types in the
program source to denote...something.  It's the something where things
get tricky.  So let's leave name itself alone.

But let's replace 'assignment' and 'binding' with the concept that is
more natural to Python's model, that of a "mapping".  A namespace maps
names to objects.  If I'm understanding you correctly, Mark, in your
model what I'm calling a namespace is the set of variable bindings in a
particular environment.  Because Python does not allow the programmer
to actually rebind a variable (Python handles the association between
name and variable completely behind the scenes), Python programmers
naturally skip past that name-to-variable binding step, and conceptually
think about the name being bound to the _value_ instead. After all,
that's the only thing they can change.  This may be unfortunate from
a precisionist viewpoint, but it is both natural and, IMO, inevitable,
because it makes thinking about Python programs more efficient.

> A while ago, I posted an essay -- to this group -- which may help
> explain the concepts:
> 
>         Message-ID: <8763k14nc6.fsf.mdw at metalzone.distorted.org.uk>
>         http://groups.google.com/group/comp.lang.python/msg/f6f1a321f819d02b
> 
> On with the question.
> 
> > def func(bar):
> >     bar.pop()
> >
> > Pass-by-reference:
> >   foo = ['Ethan','Furman']
> >   func(foo)			# bar = foo
> >
> > Pass-by-value:
> >   foo = ['Python','Rocks!']
> >   func(foo)			# bar is new name for foo
> > 				# is this any different from above?
> >
> > If I have this right, in both cases foo will be reduced to a
> > single-item list after func.  
> 
> You're correct.  So: we can conclude that the above test is not
> sufficient to distinguish the two cases.

Suppose we recast this by saying that the function has a namespace,
and in that namespace 'bar' maps to something.  What that something is
depends on what is passed in that argument position when func is called.
The calling code's namespace maps 'foo' to something.  When func is
called, a mapping to that same object is set up in func's namespace,
under the name 'bar'.

In Python's conceptual model it doesn't make any sense to ask if
the argument is passed by value or by reference.  In reality, if I'm
understanding you correctly Mark, you are absolutely correct that the
'variable' (the thing actually pointed to by 'name', which is a storage
location that contains a pointer to an object) is passed by value.
That is, the contents of the storage location that the caller's 'foo'
is pointing to is copied into a new storage location that the callee's
'bar' points to.  Conceptually, however, that is an implementation detail.
Conceptually, the important thing is that a _new mapping_ in a _different
namespace_ is set up to the _same object_.  That is the semantics that
Python the language defines.

As Steven said, talking about variables seems to be drilling down into
a level of abstraction that is more confusing than it is helpful when
you are actually _programming_ in Python.  It can be a useful level of
abstraction to talk about when trying to explain what is happening to
someone with previous experience of other languages, but it isn't useful
(in my experience) for everyday Python programming.

The reason that is true is because in Python there is _no way_ to get
a second reference to the 'variable' that is pointed to by 'foo' or by
'bar'.  (Unless you walk into that secret back room, of course, and even
then it is hard, I think.)  As I said, Python hides that level of detail
from the programmer.  This means that it effectively does not exist when
you program Python, and _this_ is why we get all tangled up in language
when we try to discuss it.  You, Mark, had to go to great lengths to
define your terms, and still a lot of people didn't get it, because in
actual, on-the-ground Python programming, variables just don't enter in to
it, because they can not be directly manipulated from the Python program.

I suspect that the longer one has been a Python programmer, the harder
it is to even see this blind spot, and thus the harder it is to respond
sensibly to someone new to Python whose conceptual model includes
variables that _can_ be accessed and manipulated from the program.  I know
_I_ had to read and re-read your posts before I finally figured it out
(assuming I have!).  (FYI, my programming learning path was roughly
Basic->FORTRAN ->LISP->assembler->C->Python, and I've been programming
Python since 1993 or thereabouts).

(BTW, I am not claiming Python is unique in this regard, I'm just talking
about how it looks from inside the Python programming mindset.)

> > Any further explanation you care to provide will be greatly
> > appreciated!
> 
> This test is sufficient to distinguish:
> 
>         def test(x):
>           x = 'clobbered'
> 
>         y = 'virgin'
>         test(y)
>         print y
> 
> If it prints `virgin' then you have call-by-value.  If it prints
> `clobbered' then you have call-by-reference.

Or if you think in terms of namespace mappings, 'test' cannot change what
'y' is mapped to in the caller's namespace, because (in this function)
it has no mapping to that namespace object.  It _can_ make changes to
the thing that y is mapped _to_, if that thing is mutable.  That's the
most useful way to think about it that I've found.  Your reasoning about
variables and call-by-reference and call-by-value, while correct and
enlightening at the computer science level, confuses me and makes me
less efficient if I think about it while writing a Python program.

> Let's examine the two cases, as I did in the essay I cited above.  I'll
> do call-by-value first.  First, we define a function `test'.  Then, we
> initialize `y'.  It's worth examining this process in detail.  The name
> `y' is initially unbound. so it is implicitly bound to a fresh
> variable.  Then, (a reference to) the string object 'virgin' is stored
> in this variable.  We can show this diagrammatically as follows.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
>
> (In the diagrams, ===> denotes a binding relationship, between names and
> variables; and ---> denotes a reference relationship, between variables
> and values.)

This diagram is IMO accurate and correct.  However, in Python we can
never actually touch [VAR] except insofar as we change the right hand
side element of the diagram.  And we can only do _that_ if we have access
to the object that is the global name space, and we mutate that object.
So for reasoning about Python programs, I think like this:

        y (in global namespace) ---> 'virgin'

> Next, we call the `test' function.  Call-by-value says that we must
> evaluate the argument expressions.  There's only one: `x'.  The value of
> a name is obtained by (a) finding which variable is bound to the name,
> and (b) extracting the value from this variable.  Well, the variable is
> the one we just bound, and the value stored is (the reference to) the
> string 'virgin'.  So the result of evaluating the argument expressions
> is simply (the reference to) that string.
>
> The function has one parameter, `y'.  A new environment is constructed
> by extending the global environment.  In this new environment, the name
> `y' is bound to a fresh variable -- distinct from all others, and
> especially from the variable bound to `x' -- and in that variable we
> store the value of the corresponding argument expression.  Result: the
> function body is executed in an environment which is like the global
> environment except that `y' is bound to a fresh variable containing
> 'virgin'.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
>                                                   ^
>                                                   |
>         x (in function `test') ====> [VAR] -------'

I would describe this (in Python) as follows: we call the test function,
passing it x.  This means we find the object that x is mapped to in
the caller's namespace, and we map 'y' in the function's namespace
to the same object:

          y (in global env.) ---> 'virgin'
                                    ^
                                    |
          x (in function 'test') ---'

> Now there's an assignment
> 
>           x = 'clobbered'
> 
> The name `x' is already bound to a variable.  So we modify that variable
> so that it stores (a reference to) the string 'clobbered'.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'
> 
>         x (in function `test') ====> [VAR] ---> 'clobbered'

Assignment in Python changes a mapping (mutates a namespace object). In
this case the mapping being changed is the local function's namespace
mapping.  We can't affect the caller's namespace mapping, because (in
this function) we don't have access to the caller's namespace object.
So I would diagram it like this:

         y (in global env.)  -----> 'virgin'

         x (in function 'test')  ----> 'clobbered'

> And then the function ends.  The environment we constructed is
> forgotten.  The variable bound to `x' is lost forever, since it wasn't
> bound to any other name.  Since modifying that variable was the only
> action carried out in the function, and the variable is now lost, there
> is no externally observable effect.  When we finally print `y', we see
> `virgin', because the variable bound to `y' was unchanged.
> 
>         y (in global env.)  ====>  [VAR]  ---> 'virgin'

The function's local namespace is not accessible to the caller, so the
caller can't access the object 'clobbered'.  Its own namespace mapping
is unchanged.  The object 'virgin' is unchanged.  So the caller sees no
change as a result of calling the function.

Now, to demonstrate that this model of namespaces-as-mappings (and
first level objects themselves) is more useful to the Python programmer
than the accurate but too-low-level description in terms of variables,
consider this:

    >>> def test(x):
    ...     x = 'clobbered'
    ...     return locals()
    >>> y = 'virgin'
    >>> ns = test(y)
    >>> print y
    virgin
    >>> print ns['x']
    clobbered

In other words, while thinking about 'variables' and 'pass by value' is
_accurate_, it does not add anything to the conceptual model a programmer
needs in order to understand and write Python code.  Namespaces as first
level objects that map names to values, however, is an extremely useful
and powerful mental model for programming in Python.  The two concepts are
conceptually equivalent regardless of implementation details (assuming we
say a namespace immutably associates names with variables, which in turn
mutably point to values), but the namespace, IMO, is the more useful of
the two when reasoning about Python programs.

> So much for call-by-value.  How about call-by-reference?  Well,
> everything is the same until the actual call.  But then everything
> changes.
> 
> Firstly, call-by-reference /doesn't/ evaluate the argument expressions.
> Instead, we just note that `y' is bound to a particular variable in the
> global environment.  The function has a single parameter `x'.  A new
> environment is constructed by extending the global environment (again):
> in this new environment, the name `x' is bound to /the same variable/
> that `y' is bound to in the global environment.
> 
>         y (in global env.)  ====>  [VAR]  <===== x (in function `test')
>                                      |
>                                      |
>                                      v
>                                  'virgin'

And this is something that you can _never_ do in Python (short of
mindbogglingly bad hackery).  I know you know that, but the fact that
you _cannot_ do it is why people start getting confused when talking
about call-by-reference vs call-by-value in a Python context.

> Now we assign to `x'.  The detailed rules are the same: `x' is bound, so
> we modify the variable it's bound to, so that it stores 'clobbered'.
> But this time, the variable being clobbered is the /same/ variable that
> `y' is bound to.  So finally, when we print `y', we see the string
> 'clobbered.
> 
> 
>         y (in global env.)  ====>  [VAR]  <===== x (in function `test')
>                                      |
>                                      |
>                                      v
>                                 'clobbered'
> 
> Now, let's look at your example.
> 
> > def func(bar):
> >     bar.pop()
> >
> >   foo = ['Ethan','Furman']
> >   func(foo)			# bar = foo
> 
> I won't describe this in the same excruciating detail as I did for the
> one above; but I will make some observations.
> 
> In call-by-reference, the environment in which the body of `func' is
> executed is constructed by extending the global environment with a
> binding of the name `bar' to the same variable as is bound to `foo' in
> the global environment.  There is only the one variable, so obviously
> both names (considered as expressions) must evaluate to the same value.
> I won't go into the details of method invocation, which in Python is
> quite complicated; but `bar.pop()' mutates this value: it modifies it in
> place.  So, when the function returns, `foo' can be seen to print
> differently.  The value is, in some sense, the /same/ value as it was
> before, in that it occupies the same storage locations, but the contents
> of those storage locations has been altered.
> 
>               foo =====> [VAR] <===== bar
>         (in global env)    |    (in function `func')   
>                            |
>                            v
>                    ['Ethan', 'Furman']

And just to be crystal clear, the above case is _not_ the one Python does.

> In call-by-value, `func' executes in an environment constructed by
> extending the global environment with a binding of `bar' to a /fresh/
> variable.  This fresh variable is then initialized: we store the value
> of the argument expression `foo' into it.  This value is a reference to
> the list ['Ethan', 'Furman'].  (See, I've stopped parenthesizing the
> reference stuff, because here it really matters.)  So, we have two
> variables, bound to `foo' and `bar', but both variables refer to the
> same list object.  The body of `func' doesn't modify any variables;
> rather, it mutates the list object in place (as above).  Since both
> variables refer to the /same/ list object, this mutation is still
> observable outside of the function.
> 
>               foo =====> [VAR] ---> ['Ethan', 'Furman']
>         (in global env)                     ^
>                                             |
>               bar =====> [VAR'] ------------'
>         (in function `func')

And for reasoning about Python programs, I would write this diagram
(which _is_ the way Python does it) as:

                foo ---> ['Ethan', 'Furman']
          (in global namespace)  ^
                                 |
                bar  ------------'
          (in 'func' namespace)

> So the reason that your example doesn't distinguish the two cases is
> because, in both cases, there's still only one value, which is mutated.
> But there is a conceptual difference, unobservable in this instance,

Unobservable in Python because Python gives the programmer no way to
create two pointers to the same '[VAR]'.

> because call-by-reference has two names bound to the same variable,
> while call-by-value has two names, bound to /distinct/ variables but
> which both refer to the same value.
> 
> Finally, it may be instructive to remove the issue of function calling
> altogether.  Consider:
> 
>         foo = ['Ethan', 'Furman']
>         bar = foo
>         bar.pop()
> 
> What is the final value of `foo'?
> 
> Now:
> 
>         x = 'virgin'
>         y = x
>         y = 'clobbered'
> 
> What is the final value of `x'?
> 
> Are you enlightened?

Hopefully so!  Your explanation of the underlying mechanics of call by
reference and call by value is the best I've ever seen, and all that
effort you put in to defining your terms earlier in this thread has
ultimately paid off.

Although this has been long enough already (especially since I quoted
your excellent article in full), I still want to go on a bit more.
I want to demonstrate the explanatory power of the namespace model,
which was one of your arguments with Steven: that his model of Python
working directly with values couldn't explain certain things.

On of the examples you gave (and I'm doing this from memory) was this:

    >>> l = [ lambda: x for x in [1,2,3] ]                                                                                                                                                                          
    >>> [ f() for f in l ]
    [3, 3, 3]

Your explanation was in terms of variables and environments, and frankly I
had a hard time following it (though I get it now).  Here's how I explain
it in terms of namespaces: lambda creates a closure, and part of the
closure is a reference to the locals namespace object that exists when the
closure is formed.  The (top level of the) list comprehension is operating
in the local namespace, so it is this namespace that gets captured inside
the closure.  When we execute the functions later, what happens is that
'x' is looked up in this namespace, and the object that _it maps to at
that time_ is returned.  Since the last assignment (mapping) to X was
to the object '3', '3' is what is returned by all three functions calls.

The code above is equivalent to the following code, which makes is
clearer what is happening:

    >>> l2 = []
    >>> for x in 1,2,3:
    ...     l2.append(locals())
    >>> [ ns['x'] for ns in l2 ]
    [3, 3, 3]

So in terms of namespaces it is crystal clear why we get three 3s,
and why the following produces three 5s:

    >>> x = 5
    >>> [ ns['x'] for ns in l2 ]
    [5, 5, 5]
    >>> [ f() for f in l ]
    [5, 5, 5]

This is conceptually equivalent to your variables and environments model,
but I think it is easier to understand and reason about, when talking
only about Python code, because it elides that level of indirection to
which the Python programmer has no access.  At least, I find it so!

To take the final step toward unifying your view with Steven's view,
we have to admit that Python objects that reference other objects can be
viewed either as having [VAR] elements containing pointers to objects,
or as namespaces referencing other objects, and that these two views
are conceptually equivalent.

Thus, take your circular list example:

    >>> a [1, 2, 3]
    >>> a[1] = a
    >>> a
    [1, [...], 3]

Your view was that this list must contain a pointer variable which points
to the list itself (a reference), while Steven held that Python lists
reference other objects directly, and had no problem with this Tardis-like
construct.  You are obviously correct that what a list is is a sequence of
variable slots that can point to any object, including the list itself.
But we can also view the list as a namespace whose name elements are a
zero-origined, monotonically increasing set of integers, and that within
this name space these names map directly to python objects.

In Python (or at least in CPython), the two views are equivalent.  But I
argue, with Steven, that the latter view is more _useful_ for a Python
programmer, and that it is in fact Python's conceptual model.

I would also argue that the latter view is the one that it is more
helpful to explain to newcomers to Python, with due acknowledgement
being made to the reality of the behind-the-scenes variables for those
coming from a background where that will be helpful.  The trick is to
get the long-time Python programmers to remember, when talking to such
a newcomer, that those variables even exist!

--RDM



From rdmurray at bitdance.com  Sat Feb 28 15:07:44 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:07:44 +0000 (UTC)
Subject: TypeErrors
References: <260144.62922.qm@web33003.mail.mud.yahoo.com>
Message-ID: <goc5ig$d9f$1@ger.gmane.org>

Sean Novick <daddysean23 at yahoo.com> wrote:
> First lookup:
> Traceback (most recent call last):
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 72, in <module>
> 			 class phonedb:
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 146, in phonedb
> 			 for entry in foo.lookup('reifsch'):
> 	 File "F:\CSC113 Module 4 CA\sample database.py", line 101, in lookup
> 			 if cmp(e, string) =3D=3D 0:
> TypeError: comparison did not return an int
>
> I do not know what this error means. I tried to look it up in help, but to no
> avail. If someone could please help or tell me where I could find an answer.
> Thanks.

The 'cmp' function (which is depricated, by the way) asks the two
arguments to compare themselves.  It does this by invoking the __cmp__
method on the first object, passing it the second.  (Actually it's more
complicated than that, but it will do as a partial explanation for now).
The __cmp__ method is expected to return an integer, which represents
the results of doing the comparison (see the docs if you want to know
the values...but as I said cmp and __cmp__ a depricated).

So, whatever 'e' is (and we can't tell from the traceback, you'll have
to work through your code to figure it out, probably by sprinkling in
'print' statements), its __cmp__ method didn't return an integer.

When you fix this, I would recommend converting to using rich comparisons
(__eq__, __lt__), etc, since __cmp__ is eventually going away (it doesn't
exist in Python 3.x).

--RDM



From rdmurray at bitdance.com  Sat Feb 28 15:19:36 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:19:36 +0000 (UTC)
Subject: OTish: convince the team to drop VBScript
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <goc68o$gat$1@ger.gmane.org>

"Christian R." <pafboing at gmail.com> wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

You don't really need arguments so much as you need negotiation, people
management and (ugh) political skills, I think.  Your task is to overcome
his prejudices, and you aren't going to do that with arguments, no matter
how good.

IMO the first thing you ought to do is dig in, really listen, and find
out what his issue is with module distribution.

Listening well is your most powerful asset.  Overcome your own prejudices
first, and his may follow :)

--RDM



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 15:32:05 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 18:32:05 -0200
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
	<c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>
Message-ID: <op.up2wnr0tx6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 16:51:04 -0200, <zaheer.agadi at gmail.com> escribi?:
> On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
>> zaheer.ag... at gmail.com wrote:
>> > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
>> > wrote:
>> >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com>  
>> escribi?:
>>
>> >>> I want to create zip file equivalent to java jar file,I created a  
>> zip
>> >>> file of my sources and added some __main__.py
>> >>> it says __Main__.py not found in Copyproject.zip..?
>> >> __main__.py must exist in the root directory.
>>
>> > What do you mean by root directory..?What is this directory in
>> > Windows..?You mean the top level folder of the project?in my case
>> > copyproject folder..?
>>
>> root directory is the topmost directory (imagine a tree, the root is
>> where all the branches branched from), in this case the root directory
>> is your copyproject main folder.
>
> I wonder, I do have the __main__.py  in the root directory,but still
> getting
> python.exe cannot find __main__.py in CopyProject.zip

The top of the tree inside the zip file. Depth zero. Not inside any  
directory. Above anything else. Just a bare name.

Open your zip using the zipfile module:

import zipfile
z = zipfile.ZipFile("xxx.zip")
z.printdir()

You should see a line starting with __main__.py *without* any / in it.

> I used the following command
> python Copyproject.zip -m __main__.py --uploadFile and also tried with
> python Copyproject.zip --uploadFile

Use the second one.

> both give me the same error , I can see the sys.path contains the
> project folder.

Uh? Which project folder? Isn't it in the .zip?

-- 
Gabriel Genellina



From rdmurray at bitdance.com  Sat Feb 28 15:34:35 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:34:35 +0000 (UTC)
Subject: How best to test functions which use date.today
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<49A97A3D.6@gmail.com> <goc0d7$vg3$1@ger.gmane.org>
Message-ID: <goc74q$ivh$1@ger.gmane.org>

Christian Heimes <lists at cheimes.de> wrote:
> Lie Ryan wrote:
> >> But this fails with:
> >>
> >> TypeError: can't set attributes of built-in/extension type
> >> 'datetime.date'
> > 
> > This is because today is an attribute. In python, we can override
> > attribute access to become a function call. I don't have python right
> > now, but try this:
> > 
> > del date.today
> > date.today = mytoday
> 
> It won't work. The datetime module is written in C. You can't modify a C
>  extension.

Hmm.  Given that, Lie, maybe what you need to do is modify your code
so that you call your own special purpose function to get 'today',
and replace _that_ for testing, using datetime's today for production.

--RDM



From gagsl-py2 at yahoo.com.ar  Sat Feb 28 15:38:01 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 18:38:01 -0200
Subject: How best to test functions which use date.today
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
Message-ID: <op.up2wxnyvx6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 15:35:47 -0200, Yuan HOng <hongyuan1306 at gmail.com>  
escribi?:

> In my project I have several date related methods which I want tested for
> correctness. The functions use date.today() in several places. Since this
> could change every time I run the test, I hope to find someway to fake a
> date.today.
>
> For illustration lets say I have a function:
>
>
> from datetime import date
> def today_is_2009():
>     return date.today().year == 2009
>
> To test this I would like to write test function like:
>
> def test_today_is_2009():
>     set_today(date(2008, 12, 31))
>     assert today_is_2009() == False
>     set_today(date(2009,1,1))
>     assert today_is_2009() == True
>

Instead of trying to inject a fake date, you could rewrite the function to
take a date argument:

def today_is_2009(today=None):
    if today is None:
      today = date.today()
    return today.year == 2009

Then, tests should pass a known date. This approach has a drawback -- you
don't test the case when no argument is given.

Another way is to use a fake date class, or a fake datetime module. Google  
"python mock object"

-- 
Gabriel Genellina



From rdmurray at bitdance.com  Sat Feb 28 15:46:42 2009
From: rdmurray at bitdance.com (rdmurray at bitdance.com)
Date: Sat, 28 Feb 2009 20:46:42 +0000 (UTC)
Subject: Creating Zip file like java jar file
References: <10a307fa-c6bb-404a-813c-bd5f0e5fa625@v18g2000pro.googlegroups.com>
	<mailman.940.1235844933.11746.python-list@python.org>
	<a10f9703-67c6-498d-aa85-849f8c1dac89@d19g2000prh.googlegroups.com>
	<mailman.942.1235846102.11746.python-list@python.org>
	<c1cf3583-a066-45cb-804e-f84fafe96789@r36g2000prf.googlegroups.com>
Message-ID: <goc7rh$kt3$1@ger.gmane.org>

zaheer.agadi at gmail.com wrote:
> On Feb 28, 11:33 pm, Lie Ryan <lie.1... at gmail.com> wrote:
> > zaheer.ag... at gmail.com wrote:
> > > On Feb 28, 11:15 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> > > wrote:
> > >> En Sat, 28 Feb 2009 14:34:15 -0200, <zaheer.ag... at gmail.com> escribi=
> =F3:
> >
> > >>> I want to create zip file equivalent to java jar file,I created a zip
> > >>> file of my sources and added some __main__.py
> > >>> it says __Main__.py not found in Copyproject.zip..?
> > >> __main__.py must exist in the root directory.
> >
> > >> --
> > >> Gabriel Genellina
> >
> > > What do you mean by root directory..?What is this directory in
> > > Windows..?You mean the top level folder of the project?in my case
> > > copyproject folder..?
> >
> > root directory is the topmost directory (imagine a tree, the root is
> > where all the branches branched from), in this case the root directory
> > is your copyproject main folder.
> 
> 
> I wonder, I do have the __main__.py  in the root directory,but still getting
> python.exe cannot find __main__.py in CopyProject.zip
> 
> I used the following command
> python Copyproject.zip -m __main__.py --uploadFile and also tried with
> python Copyproject.zip --uploadFile
> both give me the same error , I can see the sys.path contains the
> project folder.

How did you create the zip?  The __main__.py file has to be at the
_top level_ of the zip file.  In other words:

    zip test.zip __main.py othermodule.py somedir

works but

    zip test.zip myproject

does not.

--RDM



From Scott.Daniels at Acm.Org  Sat Feb 28 16:01:32 2009
From: Scott.Daniels at Acm.Org (Scott David Daniels)
Date: Sat, 28 Feb 2009 13:01:32 -0800
Subject: How best to test functions which use date.today
In-Reply-To: <mailman.939.1235843710.11746.python-list@python.org>
References: <91320d220902280935l7c3893bemeafd46d1bb3f2201@mail.gmail.com>
	<mailman.939.1235843710.11746.python-list@python.org>
Message-ID: <dvKdna3AapwWODTUnZ2dnUVZ_qXinZ2d@pdx.net>

Lie Ryan wrote:
> Yuan HOng wrote:
>> In my project I have several date related methods which I want tested for
>> correctness. The functions use date.today() in several places. Since this
>> could change every time I run the test, I hope to find someway to fake a
>> date.today.
>> For illustration lets say I have a function:
>>
>> from datetime import date
>> def today_is_2009():
>>     return date.today().year == 2009
>>
>> To test this I would like to write test function like:
>>
>> def test_today_is_2009():
>>     set_today(date(2008, 12, 31))
>>     assert today_is_2009() == False
>>     set_today(date(2009,1,1))
>>     assert today_is_2009() == True
Try something like this:
     import module_to_test as sut # "sut" -> system under test
     from datetime import date

     class FakeDate(object):
         def __init__(self, value):
             self._result = value
         def today(self):
             return self._result

     def test_today_is_2009_too_old():
         temp, sut.date = sut.date, FakeDate(date(2008, 12, 31))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp

     def test_today_is_2009_too_young():
         temp, sut.date = sut.date, FakeDate(date(2010, 1, 1))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp

     def test_today_is_2009_just_right():
         temp, sut.date = sut.date, FakeDate(date(2009, 1, 1))
         try:
             assert not sut.today_is_2009()
         finally:
             sut.date = temp


Note: each test should test 1 thing.

--Scott David Daniels
Scott.Daniels at Acm.Org


From andymac at bullseye.apana.org.au  Sat Feb 28 17:45:41 2009
From: andymac at bullseye.apana.org.au (Andrew MacIntyre)
Date: Sun, 01 Mar 2009 09:45:41 +1100
Subject: Static Map
In-Reply-To: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>
References: <1f62eead-4652-4470-8085-6bbb85932908@a12g2000yqm.googlegroups.com>
Message-ID: <49A9BE95.8070903@bullseye.andymac.org>

KMCB wrote:
> Hello,
> 
> I'm interested in creating a static map of a region in the US.  This
> map would be set into a picture format, so I can add it to a
> document.  I would like it to contain some town names and road
> information.  Then I would like to add points, based on LAT and LONG,
> that can be labeled with information I provide.
> 
> I have done some searching, Google Maps probably will not work because
> of the License.  WuGeo does not seam to have the details.  I was
> considering tw.openlayers, but do not know if that is the best
> starting point.  If I could not create the picture from Python, would
> use tw and then create a screen shot to get started.
> 
> Does anyone have thoughts on a better approach?

While web-centric, you might find
http://www.alistapart.com/articles/takecontrolofyourmaps
an interesting read.

-- 
-------------------------------------------------------------------------
Andrew I MacIntyre                     "These thoughts are mine alone..."
E-mail: andymac at bullseye.apana.org.au  (pref) | Snail: PO Box 370
        andymac at pcug.org.au             (alt) |        Belconnen ACT 2616
Web:    http://www.andymac.org/               |        Australia


From cosmo_general at yahoo.com  Sat Feb 28 18:01:56 2009
From: cosmo_general at yahoo.com (Muddy Coder)
Date: Sat, 28 Feb 2009 15:01:56 -0800 (PST)
Subject: Bug report: ClientForm
Message-ID: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>

Hi Folks,

As directed, I got ClientForm and played with it. It is cool! However,
I also found a bug:

When it parses a form, if the VALUE of a field has not space, it works
very well. For example, if a dropdown list, there many options, such
as:

<option value=foo> ....

the value foo will be picked up for sure. But, if there is a space:

<option value=foo bar> .....

The *bar* will be missed out. I wish this bug can be fixed in near
future.

By the way, can somebody helps me on setting parameter of uploading a
file. In ClientForm, if I need to upload a text file, I can do it by:

form.add_file(..., "text/plain")

What about a picture file? What is the counterpart of 'text/plain"?
Thanks!

Muddy Coder


From google at mrabarnett.plus.com  Sat Feb 28 18:42:10 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sat, 28 Feb 2009 23:42:10 +0000
Subject: Bug report: ClientForm
In-Reply-To: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
Message-ID: <49A9CBD2.9020301@mrabarnett.plus.com>

Muddy Coder wrote:
> Hi Folks,
> 
> As directed, I got ClientForm and played with it. It is cool! However,
> I also found a bug:
> 
> When it parses a form, if the VALUE of a field has not space, it works
> very well. For example, if a dropdown list, there many options, such
> as:
> 
> <option value=foo> ....
> 
> the value foo will be picked up for sure. But, if there is a space:
> 
> <option value=foo bar> .....
> 
Values should be quoted, although you can omit the quotes if there
aren't any spaces in the string:

     <option value="foo bar">

You can see examples at http://wwwsearch.sourceforge.net/ClientForm/

     <input type="checkbox" name="control2" value="foo" id="cbe1">

As you can see, whitespace separates the name=value pairs.

> The *bar* will be missed out. I wish this bug can be fixed in near
> future.
> 
It's not a bug.


From gagsl-py2 at yahoo.com.ar  Sat Feb 28 18:53:21 2009
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 28 Feb 2009 21:53:21 -0200
Subject: Bug report: ClientForm
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
Message-ID: <op.up25y7fex6zn5v@gabriel.sleipnir-bsas>

En Sat, 28 Feb 2009 21:01:56 -0200, Muddy Coder <cosmo_general at yahoo.com>  
escribi?:

> By the way, can somebody helps me on setting parameter of uploading a
> file. In ClientForm, if I need to upload a text file, I can do it by:
>
> form.add_file(..., "text/plain")
>
> What about a picture file? What is the counterpart of 'text/plain"?

See http://www.iana.org/assignments/media-types/image/

-- 
Gabriel Genellina



From cjw at ncf.ca  Sat Feb 28 19:21:09 2009
From: cjw at ncf.ca (Colin J. Williams)
Date: Sat, 28 Feb 2009 19:21:09 -0500
Subject: Proposed implementation for an Ordered Dictionary
In-Reply-To: <01b95b4d$0$20667$c3e8da3@news.astraweb.com>
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
	<01b95b4d$0$20667$c3e8da3@news.astraweb.com>
Message-ID: <49A9D4F5.8040804@ncf.ca>

Steven D'Aprano wrote:
> Colin J. Williams wrote:
> 
>> Sometimes, it's useful to be able to
>> obtain the data in the sorted sequence.
>>
>> You might consider adding functionality
>> like:
>>
>> def seqItems(self):
>> '''To return the items, sorted
>> by key. '''
>> return [self[k] for k in
>> self.seqKeys()]
> 
> Amazingly, the Python time-machine provides such functionality! Using just a
> handful of pre-existing pieces, you can do this:
> 
> sorted(mydict.items())
> sorted(mydict.keys())
> [mydict[x] for x in sorted(mydict.keys)]
> 
> and any other sequence you might need. That's the beauty of a general
> purpose programming language. You don't need everything to be a built-in
> *wink*
> 
> 
Thanks, you are right, you have a neat 
way of handling the first two, they
work with an instance of Raymond 
Hettinger's. OrderedDict.

The third suggestion has a couple of 
problems, which are fixed below.

if __name__ == '__main__':
     d= 
OrderedDict.fromkeys('abracadabra', 
value= 'zzz')
     print(d)
     print(d.seqKeys())
     print(d.seqItems())
     print(d.seqValues())
     # Steven D'Aprano's alternative
     mydict= d.copy()
     print sorted(mydict.items())
     print sorted(mydict.keys())
     # print [mydict[x] for x in 
sorted(mydict.keys)] Instance object is 
not iterable
     print(sorted(iter([(x[1], x[0]) for 
x in mydict.iteritems()]))) # This works

Colin W.


From http  Sat Feb 28 19:43:37 2009
From: http (Paul Rubin)
Date: 28 Feb 2009 16:43:37 -0800
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com>
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com>
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com>
	<49A95F12.3010906@ncf.ca>
	<01b95b4d$0$20667$c3e8da3@news.astraweb.com>
	<49A9D4F5.8040804@ncf.ca>
Message-ID: <7x1vtihy2u.fsf@ruckus.brouhaha.com>

"Colin J. Williams" <cjw at ncf.ca> writes:
>      # print [mydict[x] for x in sorted(mydict.keys)] Instance object
> is not iterable

It was a typo.  Use:

    print [mydict[x] for x in sorted(mydict.keys())]


From lie.1296 at gmail.com  Sat Feb 28 20:26:32 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:26:32 +1100
Subject: Bug report: ClientForm
In-Reply-To: <49A9CBD2.9020301@mrabarnett.plus.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
	<49A9CBD2.9020301@mrabarnett.plus.com>
Message-ID: <49A9E448.4050209@gmail.com>

MRAB wrote:
> Muddy Coder wrote:
>> Hi Folks,
>>
>> When it parses a form, if the VALUE of a field has not space, it works
>> very well. For example, if a dropdown list, there many options, such
>> as:
>>
>> <option value=foo> ....
>>
>> the value foo will be picked up for sure. But, if there is a space:
>>
>> <option value=foo bar> .....
>>
> Values should be quoted, although you can omit the quotes if there
> aren't any spaces in the string:
> 
>     <option value="foo bar">
> 
> You can see examples at http://wwwsearch.sourceforge.net/ClientForm/
> 
>     <input type="checkbox" name="control2" value="foo" id="cbe1">
> 
> As you can see, whitespace separates the name=value pairs.

It is also a good habit to have the quotes even when you don't use
spaces. Also, knowledge of xHTML in general should come in handy.


From lie.1296 at gmail.com  Sat Feb 28 20:26:32 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:26:32 +1100
Subject: Bug report: ClientForm
In-Reply-To: <49A9CBD2.9020301@mrabarnett.plus.com>
References: <a784cc06-21e0-4e8b-82b4-6c190a8769a8@p11g2000yqe.googlegroups.com>
	<49A9CBD2.9020301@mrabarnett.plus.com>
Message-ID: <49A9E448.4050209@gmail.com>

MRAB wrote:
> Muddy Coder wrote:
>> Hi Folks,
>>
>> When it parses a form, if the VALUE of a field has not space, it works
>> very well. For example, if a dropdown list, there many options, such
>> as:
>>
>> <option value=foo> ....
>>
>> the value foo will be picked up for sure. But, if there is a space:
>>
>> <option value=foo bar> .....
>>
> Values should be quoted, although you can omit the quotes if there
> aren't any spaces in the string:
> 
>     <option value="foo bar">
> 
> You can see examples at http://wwwsearch.sourceforge.net/ClientForm/
> 
>     <input type="checkbox" name="control2" value="foo" id="cbe1">
> 
> As you can see, whitespace separates the name=value pairs.

It is also a good habit to have the quotes even when you don't use
spaces. Also, knowledge of xHTML in general should come in handy.



From lie.1296 at gmail.com  Sat Feb 28 20:35:07 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:35:07 +1100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A9E64B.60408@gmail.com>

Christian R. wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

Next time you talk to him, when he say that again, interrupt him, and
say: "[citation needed]" (don't forget the parentheses).

I don't really see any reason why "python modules would cause problem
for updating customer's installations", and I can't find anything on
Google that mentioned any problem. However, I do know that upgrading
python modules is easier than upgrading most other language's
libraries[citation needed].


From lie.1296 at gmail.com  Sat Feb 28 20:35:07 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 12:35:07 +1100
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
Message-ID: <49A9E64B.60408@gmail.com>

Christian R. wrote:
> The company does use Python on rare occasions. It all comes down to
> the prejudices and habits of one of the programmers. His only argument
> I can't counter -because I don't see the problem- is that "Python
> modules cause problems for updates to customer's installations".

Next time you talk to him, when he say that again, interrupt him, and
say: "[citation needed]" (don't forget the parentheses).

I don't really see any reason why "python modules would cause problem
for updating customer's installations", and I can't find anything on
Google that mentioned any problem. However, I do know that upgrading
python modules is easier than upgrading most other language's
libraries[citation needed].



From seaworthyjeremy at gmail.com  Sat Feb 28 20:50:35 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sat, 28 Feb 2009 17:50:35 -0800 (PST)
Subject: Email Program
Message-ID: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>

Is it possible to make a GUI email program in Python that stores
emails, composes, ect?


From seaworthyjeremy at gmail.com  Sat Feb 28 20:56:40 2009
From: seaworthyjeremy at gmail.com (J)
Date: Sat, 28 Feb 2009 17:56:40 -0800 (PST)
Subject: Email Program
Message-ID: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>

Is it possible to make a GUI email program in Python that stores
emails, composes, ect? Also, could I create my own programming
language in Python? What are Pythons limits, or is this just a waste
of my time to learn it.


From google at mrabarnett.plus.com  Sat Feb 28 20:59:33 2009
From: google at mrabarnett.plus.com (MRAB)
Date: Sun, 01 Mar 2009 01:59:33 +0000
Subject: Email Program
In-Reply-To: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>
References: <69614c1f-af13-4ba5-ba01-89ecd486b680@n33g2000pri.googlegroups.com>
Message-ID: <49A9EC05.3000009@mrabarnett.plus.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect?
> 
Yes.


From traef at ebasedsecurity.com  Sat Feb 28 21:03:55 2009
From: traef at ebasedsecurity.com (Thomas Raef)
Date: Sat, 28 Feb 2009 20:03:55 -0600
Subject: Email Program
Message-ID: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>

What a great response.

> -----Original Message-----
> From: python-list-bounces+traef=ebasedsecurity.com at python.org
> [mailto:python-list-bounces+traef=ebasedsecurity.com at python.org] On
> Behalf Of MRAB
> Sent: Saturday, February 28, 2009 8:00 PM
> To: python-list at python.org
> Subject: Re: Email Program
> 
> J wrote:
> > Is it possible to make a GUI email program in Python that stores
> > emails, composes, ect?
> >
> Yes.
> --
> http://mail.python.org/mailman/listinfo/python-list


From lists at cheimes.de  Sat Feb 28 21:23:48 2009
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 01 Mar 2009 03:23:48 +0100
Subject: Email Program
In-Reply-To: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>
References: <C4A2DDDA4F0A5C46A91AE25DD243546E080903@ebs-2200.ebasedsecurity.local>
Message-ID: <gocrjk$b1$1@ger.gmane.org>

Thomas Raef wrote:
> What a great response.

It's a correct, straight forward and short answer to the op's question.

Christian



From lie.1296 at gmail.com  Sat Feb 28 21:24:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 13:24:57 +1100
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9F1F9.8090700@gmail.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

Python is Turing Complete.


From lie.1296 at gmail.com  Sat Feb 28 21:24:57 2009
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 01 Mar 2009 13:24:57 +1100
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9F1F9.8090700@gmail.com>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

Python is Turing Complete.



From timr at probo.com  Sat Feb 28 21:41:10 2009
From: timr at probo.com (Tim Roberts)
Date: Sat, 28 Feb 2009 18:41:10 -0800
Subject: why cannot assign to function call
References: <2f5d382e-bdeb-4a3e-ac47-cba44e82dc6a@s9g2000prm.googlegroups.com>	<slrngmchoe.qun.mdw@metalzone.distorted.org.uk>	<01771716$0$8693$c3e8da3@news.astraweb.com>	<slrngmfchf.qun.mdw@metalzone.distorted.org.uk>	<0178651d$0$8693$c3e8da3@news.astraweb.com>	<slrngmhgmr.qun.mdw@metalzone.distorted.org.uk>	<pan.2009.01.13.09.54.20@REMOVE.THIS.cybersource.com.au>
	<slrngmq7ki.pva.mdw@metalzone.distorted.org.uk>
	<mailman.924.1235778394.11746.python-list@python.org>
Message-ID: <d4tjq4l296s96rm1k9i7o5pg15m9n5mkdi@4ax.com>

Ethan Furman <ethan at stoneleaf.us> wrote:
>
>Specifically, how is a new name (pbr) different, in Python, from a new 
>name initialized as if by assignment (pbv)?  It seems to me than you end 
>up with the same thing in either case (in Python, at least), making the 
>distinction non-existent.
>
>def func(bar):
>     bar.pop()
>
>Pass-by-reference:
>   foo = ['Ethan','Furman']
>   func(foo)			# bar = foo

The problem here, in my view, is the terminology.  It is true that, inside
the function "func", "bar" will refer to the same list that "foo" refers
to.  However, it is inaccurate to think of this list as "foo".  There
exists a list -- an anonymous list in object space -- and while "func" is
executing, there are two names bound to that list.  So, the "bar.pop()"
instruction changes that anonymous list, you'll see those changes if you
inspect "foo" after the call.

>Pass-by-value:
>   foo = ['Python','Rocks!']
>   func(foo)			# bar is new name for foo
>				# is this any different from above?

Yes, it's different.  If Python really had "pass by value", that function
call would pass a COPY of the list.  The function would receive the list's
"value", not the list itself.

>If I have this right, in both cases foo will be reduced to a single-item 
>list after func.  Any further explanation you care to provide will be 
>greatly appreciated!

Nope.  Under pass-by-value semantics, "func" could dance on the list to its
heart's content, and "foo" would not be changed.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From sgeiger at councilforeconed.org  Sat Feb 28 22:02:38 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Sat, 28 Feb 2009 22:02:38 -0500
Subject: Email Program
In-Reply-To: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
References: <37d2f82a-07db-4d7b-a883-6c9f6be40b8d@p6g2000pre.googlegroups.com>
Message-ID: <49A9FACE.9080602@councilforeconed.org>

J wrote:
> Is it possible to make a GUI email program in Python that stores
> emails, composes, ect? Also, could I create my own programming
> language in Python? What are Pythons limits, or is this just a waste
> of my time to learn it.
>   

Python is "Turing complete," which means it is a general-purpose 
programming language.  Generally speaking, this means you can do 
anything with it that you can do with any other programming language.  
Being a higher-level language, Python is often chosen over other 
languages because it is faster to do many things in Python.

You could also create another programming language with Python.  In 
fact, another general-purpose programming language (C) was used to 
create Python.

Python makes many things easy.  For many tasks, Python saves you a lot 
of time.  It is a good general-purpose tool to know how to use well.  It 
is a good beginner's language, as it makes many of the annoying things 
about programs non-issues.



-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From sgeiger at councilforeconed.org  Sat Feb 28 22:10:29 2009
From: sgeiger at councilforeconed.org (Shane Geiger)
Date: Sat, 28 Feb 2009 22:10:29 -0500
Subject: OTish: convince the team to drop VBScript
In-Reply-To: <49A9E64B.60408@gmail.com>
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com>
	<49A9E64B.60408@gmail.com>
Message-ID: <49A9FCA5.7020000@councilforeconed.org>


>> The company does use Python on rare occasions. It all comes down to
>> the prejudices and habits of one of the programmers. His only argument
>> I can't counter -because I don't see the problem- is that "Python
>> modules cause problems for updates to customer's installations".
>>     

This is purely an argument from ignorance, a logical fallacy. 

Python is one of the more flexible, cleanly designed tools you could 
have at your disposal--it is certainly more powerful, flexible and 
elegant than VBScript.  If he has any doubts about how things can be 
designed with Python, show him that py2web (a web server/development 
environment) requires no installation, can run on a USB memory stick, 
can work with multiple operating systems, and can run on a cell phone 
(see youtube demo). 



> Next time you talk to him, when he say that again, interrupt him, and
> say: "[citation needed]" (don't forget the parentheses).
>
> I don't really see any reason why "python modules would cause problem
> for updating customer's installations", and I can't find anything on
> Google that mentioned any problem. However, I do know that upgrading
> python modules is easier than upgrading most other language's
> libraries[citation needed].
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>   


-- 
Shane Geiger, IT Director
Council For Economic Education / www.councilforeconed.org
sgeiger at councilforeconed.org  / 402-438-8958

Teaching Opportunity



From perfreem at gmail.com  Sat Feb 28 22:30:04 2009
From: perfreem at gmail.com (per)
Date: Sat, 28 Feb 2009 19:30:04 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
Message-ID: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>

hi all,

i recently installed a new version of a package using python setup.py
install --prefix=/my/homedir on a system where i don't have root
access. the old package still resides in /usr/lib/python2.5/site-
packages/ and i cannot erase it.

i set my python path as follows in ~/.cshrc

setenv PYTHONPATH /path/to/newpackage

but whenever i go to python and import the module, the version in site-
packages is loaded. how can i override this setting and make it so
python loads the version of the package that's in my home dir?

 thanks.




From pavlovevidence at gmail.com  Sat Feb 28 23:09:03 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 28 Feb 2009 20:09:03 -0800 (PST)
Subject: OTish: convince the team to drop VBScript
References: <88c4def10902281040w1f23b0dfpf9367922782c8471@mail.gmail.com> 
	<49A9E64B.60408@gmail.com>
	<mailman.972.1235877082.11746.python-list@python.org>
Message-ID: <13188e5f-a5d5-4235-ac51-82a407e4a7db@w24g2000prd.googlegroups.com>

On Feb 28, 7:10?pm, Shane Geiger <sgei... at councilforeconed.org> wrote:
> >> The company does use Python on rare occasions. It all comes down to
> >> the prejudices and habits of one of the programmers. His only argument
> >> I can't counter -because I don't see the problem- is that "Python
> >> modules cause problems for updates to customer's installations".
>
> This is purely an argument from ignorance, a logical fallacy.

I don't think it's an argument at all.  The guy probably had something
more specific in mind but didn't express himself well, and it might
have even been a real issue.  Python is not, unfortunately, the
easiest language to deploy applications in.

I don't think there is any deployment difficulty so great that I would
ever chose VBscript, but opinions might differ.


Carl Banks


From michele.simionato at gmail.com  Sat Feb 28 23:16:47 2009
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sat, 28 Feb 2009 20:16:47 -0800 (PST)
Subject: Proposed implementation for an Ordered Dictionary
References: <5c65efb2-0862-4b85-bb37-88687ac6fedd@q9g2000yqc.googlegroups.com>
	<da61e3b8-15e8-4ea9-9491-d3d5b89adbae@r36g2000prf.googlegroups.com> 
	<6d818c3d-1d6d-4720-8775-427b3832c590@u18g2000pro.googlegroups.com> 
	<6f52f838-d435-40b8-865e-55f3aed1bb1e@w24g2000prd.googlegroups.com> 
	<49A95F12.3010906@ncf.ca> <01b95b4d$0$20667$c3e8da3@news.astraweb.com> 
	<49A9D4F5.8040804@ncf.ca> <7x1vtihy2u.fsf@ruckus.brouhaha.com>
Message-ID: <47701903-057e-4dd8-bd96-86afbe551f5b@w9g2000yqa.googlegroups.com>

On Mar 1, 1:43?am, Paul Rubin <http://phr... at NOSPAM.invalid> wrote:
> "Colin J. Williams" <c... at ncf.ca> writes:
>
> > ? ? ?# print [mydict[x] for x in sorted(mydict.keys)] Instance object
> > is not iterable
>
> It was a typo. ?Use:
>
> ? ? print [mydict[x] for x in sorted(mydict.keys())]

Even better

print [mydict[x] for x in sorted(mydict)]


From pavlovevidence at gmail.com  Sat Feb 28 23:24:17 2009
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 28 Feb 2009 20:24:17 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
References: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>
Message-ID: <5c5b74e8-c459-4019-9140-e92fb3e06da4@k29g2000prf.googlegroups.com>

On Feb 28, 7:30?pm, per <perfr... at gmail.com> wrote:
> hi all,
>
> i recently installed a new version of a package using python setup.py
> install --prefix=/my/homedir on a system where i don't have root
> access. the old package still resides in /usr/lib/python2.5/site-
> packages/ and i cannot erase it.
>
> i set my python path as follows in ~/.cshrc
>
> setenv PYTHONPATH /path/to/newpackage
>
> but whenever i go to python and import the module, the version in site-
> packages is loaded. how can i override this setting and make it so
> python loads the version of the package that's in my home dir?


What happens when you run the command "print sys.path" from the Python
prompt?  /path/to/newpackage should be the second item, and shoud be
listed in front of the site-packages dir.

What happens when you run "print os.eviron['PYTHONPATH']" at the
Python interpreter?  It's possible that the sysadmin installed a
script that removes PYTHONPATH environment variable before invoking
Python.  What happens when you type "which python" at the csh prompt?

What happens when you type "ls /path/to/newpackage" at your csh
prompt?  Is the module you're trying to import there?

You approach should work.  These are just suggestions on how to
diagnose the problem; we can't really help you figure out what's wrong
without more information.


Carl Banks


From perfreem at gmail.com  Sat Feb 28 23:53:45 2009
From: perfreem at gmail.com (per)
Date: Sat, 28 Feb 2009 20:53:45 -0800 (PST)
Subject: setting PYTHONPATH to override system wide site-packages
References: <1ac9874e-67ef-4f90-8075-5e94a70b536b@x38g2000yqj.googlegroups.com>
	<5c5b74e8-c459-4019-9140-e92fb3e06da4@k29g2000prf.googlegroups.com>
Message-ID: <11876bd1-b671-4218-b4bb-d15fb1822cb6@h5g2000yqh.googlegroups.com>

On Feb 28, 11:24?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> On Feb 28, 7:30?pm, per <perfr... at gmail.com> wrote:
>
> > hi all,
>
> > i recently installed a new version of a package using python setup.py
> > install --prefix=/my/homedir on a system where i don't have root
> > access. the old package still resides in /usr/lib/python2.5/site-
> > packages/ and i cannot erase it.
>
> > i set my python path as follows in ~/.cshrc
>
> > setenv PYTHONPATH /path/to/newpackage
>
> > but whenever i go to python and import the module, the version in site-
> > packages is loaded. how can i override this setting and make it so
> > python loads the version of the package that's in my home dir?
>
> What happens when you run the command "print sys.path" from the Python
> prompt? ?/path/to/newpackage should be the second item, and shoud be
> listed in front of the site-packages dir.
>
> What happens when you run "print os.eviron['PYTHONPATH']" at the
> Python interpreter? ?It's possible that the sysadmin installed a
> script that removes PYTHONPATH environment variable before invoking
> Python. ?What happens when you type "which python" at the csh prompt?
>
> What happens when you type "ls /path/to/newpackage" at your csh
> prompt? ?Is the module you're trying to import there?
>
> You approach should work. ?These are just suggestions on how to
> diagnose the problem; we can't really help you figure out what's wrong
> without more information.
>
> Carl Banks

hi,

i am setting it programmatically now, using:

import sys
sys.path = [....]

sys.path now looks exactly like what it looked like before, except the
second element is my directory. yet when i do

import mymodule
print mymodule.__version__

i still get the old version...

any other ideas?